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/* 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
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
void proto_register_fefd(void);
void proto_reg_handoff_fefd(void);
static dissector_handle_t fefd_handle;
/* 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;
#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;
static int * const flags[] = {
&hf_fefd_flags_rt,
&hf_fefd_flags_rsy,
NULL
};
static int * const headers[] = {
&hf_fefd_version,
&hf_fefd_opcode,
NULL
};
col_set_str(pinfo->cinfo, COL_PROTOCOL, "FEFD");
col_clear(pinfo->cinfo, COL_INFO);
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_bitmask_list(fefd_tree, tvb, offset, 1, headers, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_bitmask(fefd_tree, tvb, offset, hf_fefd_flags, ett_fefd_flags, flags, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_checksum(fefd_tree, tvb, offset, hf_fefd_checksum, -1, NULL, pinfo, 0, ENC_BIG_ENDIAN, PROTO_CHECKSUM_NO_FLAGS);
offset += 2;
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(pinfo->pool, 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(pinfo->pool, 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(pinfo->pool, 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(pinfo->pool, 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_data_dissector(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));
fefd_handle = register_dissector("fefd", dissect_fefd, proto_fefd);
}
void
proto_reg_handoff_fefd(void)
{
dissector_add_uint("llc.force10_pid", 0x0111, fefd_handle);
}
/*
* Editor modelines - https://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:
*/
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