summaryrefslogtreecommitdiffstats
path: root/epan/dissectors/packet-fefd.c
diff options
context:
space:
mode:
Diffstat (limited to 'epan/dissectors/packet-fefd.c')
-rw-r--r--epan/dissectors/packet-fefd.c290
1 files changed, 290 insertions, 0 deletions
diff --git a/epan/dissectors/packet-fefd.c b/epan/dissectors/packet-fefd.c
new file mode 100644
index 00000000..d77c146e
--- /dev/null
+++ b/epan/dissectors/packet-fefd.c
@@ -0,0 +1,290 @@
+/* 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:
+ */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-21 15:51:10 +0000