forked from osmocom/wireshark
302 lines
11 KiB
C
302 lines
11 KiB
C
/* packet-fefd.c
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* Routines for the disassembly of the "Far End Failure Detection"
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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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* Copyright 1998 Gerald Combs
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*
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* Copied from packet-udld.c
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <epan/packet.h>
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void proto_register_fefd(void);
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void proto_reg_handoff_fefd(void);
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/* Offsets in TLV structure. */
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#define TLV_TYPE 0
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#define TLV_LENGTH 2
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static int proto_fefd = -1;
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static int hf_fefd_version = -1;
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static int hf_fefd_opcode = -1;
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static int hf_fefd_flags = -1;
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static int hf_fefd_flags_rt = -1;
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static int hf_fefd_flags_rsy = -1;
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static int hf_fefd_checksum = -1;
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static int hf_fefd_tlvtype = -1;
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static int hf_fefd_tlvlength = -1;
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static int hf_fefd_device_id = -1;
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static int hf_fefd_sent_through_interface = -1;
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static int hf_fefd_data = -1;
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static gint ett_fefd = -1;
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static gint ett_fefd_flags = -1;
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static gint ett_fefd_tlv = -1;
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#define TYPE_DEVICE_ID 0x0001
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#define TYPE_PORT_ID 0x0002
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#define TYPE_ECHO 0x0003
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#define TYPE_MESSAGE_INTERVAL 0x0004
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#define TYPE_TIMEOUT_INTERVAL 0x0005
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#define TYPE_DEVICE_NAME 0x0006
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#define TYPE_SEQUENCE_NUMBER 0x0007
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static const value_string type_vals[] = {
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{ TYPE_DEVICE_ID, "Device ID" },
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{ TYPE_PORT_ID, "Port ID" },
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{ TYPE_ECHO, "Echo" },
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{ TYPE_MESSAGE_INTERVAL, "Message interval" },
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{ TYPE_TIMEOUT_INTERVAL, "Timeout interval" },
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{ TYPE_DEVICE_NAME, "Device name" },
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{ TYPE_SEQUENCE_NUMBER, "Sequence number" },
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{ 0, NULL }
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};
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#define OPCODE_RESERVED 0x00
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#define OPCODE_PROBE 0x01
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#define OPCODE_ECHO 0x02
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#define OPCODE_FLUSH 0x03
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static const value_string opcode_vals[] = {
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{ OPCODE_RESERVED, "Reserved" },
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{ OPCODE_PROBE, "Probe" },
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{ OPCODE_ECHO, "Echo" },
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{ OPCODE_FLUSH, "Flush" },
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{ 0, NULL }
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};
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static int
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dissect_fefd(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_item *ti;
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proto_tree *fefd_tree = NULL;
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int offset = 0;
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guint16 type;
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guint16 length;
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proto_tree *tlv_tree;
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int real_length;
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static const int * flags[] = {
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&hf_fefd_flags_rt,
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&hf_fefd_flags_rsy,
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NULL
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};
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static const int * headers[] = {
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&hf_fefd_version,
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&hf_fefd_opcode,
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NULL
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};
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "FEFD");
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col_clear(pinfo->cinfo, COL_INFO);
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ti = proto_tree_add_item(tree, proto_fefd, tvb, offset, -1, ENC_NA);
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fefd_tree = proto_item_add_subtree(ti, ett_fefd);
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/* FEFD header */
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proto_tree_add_bitmask_list(fefd_tree, tvb, offset, 1, headers, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_bitmask(fefd_tree, tvb, offset, hf_fefd_flags, ett_fefd_flags, flags, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_checksum(fefd_tree, tvb, offset, hf_fefd_checksum, -1, NULL, pinfo, 0, ENC_BIG_ENDIAN, PROTO_CHECKSUM_NO_FLAGS);
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offset += 2;
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while (tvb_reported_length_remaining(tvb, offset) != 0) {
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type = tvb_get_ntohs(tvb, offset + TLV_TYPE);
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length = tvb_get_ntohs(tvb, offset + TLV_LENGTH);
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if (length < 4) {
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if (tree) {
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tlv_tree = proto_tree_add_subtree_format(fefd_tree, tvb, offset, 4, /* XXX - expert info? */
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ett_fefd_tlv, NULL, "TLV with invalid length %u (< 4)",
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length);
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proto_tree_add_uint(tlv_tree, hf_fefd_tlvtype, tvb,
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offset + TLV_TYPE, 2, type);
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proto_tree_add_uint(tlv_tree, hf_fefd_tlvlength, tvb,
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offset + TLV_LENGTH, 2, length);
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}
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offset += 4;
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break;
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}
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switch (type) {
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case TYPE_DEVICE_ID:
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/* Device ID */
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col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL,
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"Device ID: %s",
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tvb_format_stringzpad(tvb, offset + 4,
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length - 4));
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if (tree) {
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tlv_tree = proto_tree_add_subtree_format(fefd_tree, tvb, offset,
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length, ett_fefd_tlv, NULL, "Device ID: %s",
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tvb_format_stringzpad(tvb, offset + 4, length - 4));
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proto_tree_add_uint(tlv_tree, hf_fefd_tlvtype, tvb,
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offset + TLV_TYPE, 2, type);
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proto_tree_add_uint(tlv_tree, hf_fefd_tlvlength, tvb,
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offset + TLV_LENGTH, 2, length);
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proto_tree_add_item(tlv_tree, hf_fefd_device_id, tvb, offset + 4,
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length - 4, ENC_NA|ENC_ASCII);
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}
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offset += length;
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break;
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case TYPE_PORT_ID:
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real_length = length;
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if (tvb_get_guint8(tvb, offset + real_length) != 0x00) {
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/* The length in the TLV doesn't appear to be the
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length of the TLV, as the byte just past it
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isn't the first byte of a 2-byte big-endian
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small integer; make the length of the TLV the length
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in the TLV, plus 4 bytes for the TLV type and length,
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minus 1 because that's what makes one capture work. */
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real_length = length + 3;
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}
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col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL,
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"Port ID: %s",
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tvb_format_stringzpad(tvb, offset + 4, real_length - 4));
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if (tree) {
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tlv_tree = proto_tree_add_subtree_format(fefd_tree, tvb, offset,
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real_length, ett_fefd_tlv, NULL, "Port ID: %s",
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tvb_format_text(tvb, offset + 4, real_length - 4));
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proto_tree_add_uint(tlv_tree, hf_fefd_tlvtype, tvb,
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offset + TLV_TYPE, 2, type);
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proto_tree_add_uint(tlv_tree, hf_fefd_tlvlength, tvb,
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offset + TLV_LENGTH, 2, length);
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proto_tree_add_item(tlv_tree, hf_fefd_sent_through_interface, tvb, offset + 4,
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real_length - 4, ENC_NA|ENC_ASCII);
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}
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offset += real_length;
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break;
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case TYPE_ECHO:
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case TYPE_MESSAGE_INTERVAL:
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case TYPE_TIMEOUT_INTERVAL:
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case TYPE_DEVICE_NAME:
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case TYPE_SEQUENCE_NUMBER:
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default:
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tlv_tree = proto_tree_add_subtree_format(fefd_tree, tvb, offset,
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length, ett_fefd_tlv, NULL, "Type: %s, length: %u",
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val_to_str(type, type_vals, "Unknown (0x%04x)"),
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length);
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proto_tree_add_uint(tlv_tree, hf_fefd_tlvtype, tvb,
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offset + TLV_TYPE, 2, type);
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proto_tree_add_uint(tlv_tree, hf_fefd_tlvlength, tvb,
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offset + TLV_LENGTH, 2, length);
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if (length > 4) {
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proto_tree_add_item(tlv_tree, hf_fefd_data, tvb, offset + 4,
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length - 4, ENC_NA);
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} else {
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return tvb_captured_length(tvb);
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}
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offset += length;
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}
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}
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call_data_dissector(tvb_new_subset_remaining(tvb, offset), pinfo, fefd_tree);
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return tvb_captured_length(tvb);
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}
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void
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proto_register_fefd(void)
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{
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static hf_register_info hf[] = {
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{ &hf_fefd_version,
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{ "Version", "fefd.version", FT_UINT8, BASE_DEC, NULL, 0xE0,
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NULL, HFILL }},
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{ &hf_fefd_opcode,
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{ "Opcode", "fefd.opcode", FT_UINT8, BASE_DEC, VALS(opcode_vals), 0x1F,
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NULL, HFILL }},
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{ &hf_fefd_flags,
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{ "Flags", "fefd.flags", FT_UINT8, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_fefd_flags_rt,
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{ "Recommended timeout", "fefd.flags.rt", FT_BOOLEAN, 8, NULL, 0x80,
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NULL, HFILL }},
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{ &hf_fefd_flags_rsy,
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{ "ReSynch", "fefd.flags.rsy", FT_BOOLEAN, 8, NULL, 0x40,
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NULL, HFILL }},
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{ &hf_fefd_checksum,
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{ "Checksum", "fefd.checksum", FT_UINT16, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_fefd_tlvtype,
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{ "Type", "fefd.tlv.type", FT_UINT16, BASE_HEX, VALS(type_vals), 0x0,
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NULL, HFILL }},
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{ &hf_fefd_tlvlength,
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{ "Length", "fefd.tlv.len", FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_fefd_device_id,
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{ "Device ID", "fefd.device_id", FT_STRINGZ, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_fefd_sent_through_interface,
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{ "Sent through Interface", "fefd.sent_through_interface", FT_STRING, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_fefd_data,
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{ "Data", "fefd.data", 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_fefd,
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&ett_fefd_flags,
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&ett_fefd_tlv
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};
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proto_fefd = proto_register_protocol("Far End Failure Detection", "FEFD", "fefd");
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proto_register_field_array(proto_fefd, 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_fefd(void)
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{
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dissector_handle_t fefd_handle;
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fefd_handle = create_dissector_handle(dissect_fefd, proto_fefd);
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dissector_add_uint("llc.force10_pid", 0x0111, fefd_handle);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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