Adding upstream version 4.2.2.upstream/4.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 183 insertions, 0 deletions

diff --git a/epan/dissectors/packet-tdmoe.c b/epan/dissectors/packet-tdmoe.c
new file mode 100644
index 00000000..ab8bce02
--- /dev/null
+++ b/epan/dissectors/packet-tdmoe.c
@@ -0,0 +1,183 @@
+/* packet-tdmoe.c
+ * Routines for TDM over Ethernet packet disassembly
+ * Copyright 2010, Haakon Nessjoen <haakon.nessjoen@gmail.com>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+
+#include <epan/packet.h>
+#include <epan/etypes.h>
+#include <epan/prefs.h>
+
+/* Bitmasks for the flags in the fourth byte of the packet */
+#define TDMOE_YELLOW_ALARM_BITMASK 0x01
+#define TDMOE_SIGBITS_BITMASK      0x02
+
+void proto_reg_handoff_tdmoe(void);
+void proto_register_tdmoe(void);
+
+static dissector_handle_t tdmoe_handle;
+
+/* protocols and header fields */
+static int proto_tdmoe = -1;
+
+static int hf_tdmoe_subaddress = -1;
+static int hf_tdmoe_samples = -1;
+static int hf_tdmoe_flags = -1;
+static int hf_tdmoe_yellow_alarm = -1;
+static int hf_tdmoe_sig_bits_present = -1;
+static int hf_tdmoe_packet_counter = -1;
+static int hf_tdmoe_channels = -1;
+static int hf_tdmoe_sig_bits = -1;
+
+static gint ett_tdmoe = -1;
+static gint ett_tdmoe_flags = -1;
+
+static dissector_handle_t lapd_handle;
+
+static gint pref_tdmoe_d_channel = 24;
+
+static int
+dissect_tdmoe(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
+{
+	proto_item *ti;
+	proto_tree *tdmoe_tree;
+	tvbuff_t   *next_client;
+	guint16     channels;
+	guint16     subaddress;
+	gint32 offset = 0;
+	static int * const flags[] = { &hf_tdmoe_yellow_alarm, &hf_tdmoe_sig_bits_present, NULL };
+	int         chan;
+
+	/* Check that there's enough data */
+	if (tvb_captured_length(tvb) < 8)
+		return 0;
+
+	subaddress = tvb_get_ntohs(tvb, 0);
+	channels   = tvb_get_ntohs(tvb, 6);
+
+	col_set_str(pinfo->cinfo, COL_PROTOCOL, "TDMoE");
+	col_add_fstr(pinfo->cinfo, COL_INFO, "Subaddress: %d Channels: %d %s",
+		subaddress,
+		channels,
+		(tvb_get_guint8(tvb, 3) & TDMOE_YELLOW_ALARM_BITMASK ? "[YELLOW ALARM]" : "")
+	);
+
+
+	/* create display subtree for the protocol */
+	ti = proto_tree_add_item(tree, proto_tdmoe, tvb, 0, -1, ENC_NA);
+	tdmoe_tree = proto_item_add_subtree(ti, ett_tdmoe);
+
+	/* Subaddress */
+	proto_tree_add_item(tdmoe_tree, hf_tdmoe_subaddress, tvb, offset, 2, ENC_BIG_ENDIAN);
+	offset+=2;
+
+	/* Samples (1 byte) */
+	proto_tree_add_item(tdmoe_tree, hf_tdmoe_samples, tvb, offset, 1, ENC_BIG_ENDIAN);
+	offset++;
+
+	/* Yellow alarm & "Sig bits present" bits (1 byte) */
+	proto_tree_add_bitmask(tdmoe_tree, tvb, offset, hf_tdmoe_flags, ett_tdmoe_flags, flags, ENC_BIG_ENDIAN);
+	offset++;
+
+	/* Packet counter (2 bytes) */
+	proto_tree_add_item(tdmoe_tree, hf_tdmoe_packet_counter, tvb, offset, 2, ENC_BIG_ENDIAN);
+	offset+=2;
+
+	/* Number of channels in packet (2 bytes) */
+	proto_tree_add_item(tdmoe_tree, hf_tdmoe_channels, tvb, offset, 2, ENC_BIG_ENDIAN);
+	offset+=2;
+
+	if (tvb_get_guint8(tvb, 3) & TDMOE_SIGBITS_BITMASK) {
+		/* 4 sigbits per channel. Might be different on other sub-protocols? */
+		guint16 length = (channels >> 1) + ((channels & 0x01) ? 1 : 0);
+
+		proto_tree_add_item(tdmoe_tree, hf_tdmoe_sig_bits, tvb, offset, length, ENC_NA);
+		offset += length;
+	}
+
+	/* The rest is SAMPLES * CHANNELS bytes of channel data */
+	for (chan = 1; chan <= channels; chan++) {
+		next_client = tvb_new_subset_length(tvb, offset + ((chan - 1) * 8), 8);
+		if (chan == pref_tdmoe_d_channel) {
+			call_dissector(lapd_handle, next_client, pinfo, tree);
+		} else {
+			call_data_dissector(next_client, pinfo, tree);
+		}
+	}
+	return 1;
+}
+
+void
+proto_register_tdmoe(void)
+{
+	static hf_register_info hf[] = {
+
+		{ &hf_tdmoe_subaddress,
+		  { "Subaddress",	"tdmoe.subaddress", FT_UINT16, BASE_DEC, NULL, 0x0,
+		    NULL, HFILL }},
+		{ &hf_tdmoe_samples,
+		  { "Samples",	"tdmoe.samples", FT_UINT8, BASE_DEC, NULL, 0x0,
+		    "Samples per channel", HFILL }},
+		{ &hf_tdmoe_flags,
+		  { "Flags",	"tdmoe.flags", FT_UINT8, BASE_HEX, NULL, 0x0,
+		    NULL, HFILL }},
+		{ &hf_tdmoe_yellow_alarm,
+		  { "Yellow Alarm", "tdmoe.yellowalarm", FT_BOOLEAN, 8, NULL, TDMOE_YELLOW_ALARM_BITMASK,
+		    NULL, HFILL }},
+		{ &hf_tdmoe_sig_bits_present,
+		  { "Sig bits present", "tdmoe.sig_bits_present", FT_BOOLEAN, 8, NULL, TDMOE_SIGBITS_BITMASK,
+		    NULL, HFILL }},
+		{ &hf_tdmoe_packet_counter,
+		  { "Counter", "tdmoe.counter", FT_UINT16, BASE_DEC, NULL, 0x0,
+		    "Packet number", HFILL }},
+		{ &hf_tdmoe_channels,
+		  { "Channels", "tdmoe.channels", FT_UINT16, BASE_DEC, NULL, 0x0,
+		    NULL, HFILL }},
+		{ &hf_tdmoe_sig_bits,
+		  { "Sig bits", "tdmoe.sig_bits", FT_BYTES, BASE_NONE, NULL, 0x0,
+		    NULL, HFILL }},
+	};
+	static gint *ett[] = {
+		&ett_tdmoe,
+		&ett_tdmoe_flags
+	};
+	module_t *tdmoe_module;
+
+	proto_tdmoe = proto_register_protocol("Digium TDMoE Protocol", "TDMoE", "tdmoe");
+	proto_register_field_array(proto_tdmoe, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+	tdmoe_handle = register_dissector("tdmoe", dissect_tdmoe, proto_tdmoe);
+	tdmoe_module = prefs_register_protocol(proto_tdmoe, NULL);
+	prefs_register_uint_preference(tdmoe_module, "d_channel",
+				       "TDMoE D-Channel",
+				       "The TDMoE channel that contains the D-Channel.",
+				       10, &pref_tdmoe_d_channel);
+}
+
+void
+proto_reg_handoff_tdmoe(void)
+{
+	dissector_add_uint("ethertype", ETHERTYPE_TDMOE, tdmoe_handle);
+
+	lapd_handle = find_dissector_add_dependency("lapd-bitstream", proto_tdmoe);
+}
+
+/*
+ * Editor modelines  -  https://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:
+ */