packet-sv.c

/* Do not modify this file. Changes will be overwritten.                      */
/* Generated automatically by the ASN.1 to Wireshark dissector compiler       */
/* packet-sv.c                                                                */
/* asn2wrs.py -b -q -L -p sv -c ./sv.cnf -s ./packet-sv-template -D . -O ../.. sv.asn */

/* packet-sv.c
 * Routines for IEC 61850 Sampled Values packet dissection
 * Michael Bernhard 2008
 *
 * 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/asn1.h>
#include <epan/etypes.h>
#include <epan/expert.h>
#include <epan/prefs.h>
#include <epan/addr_resolv.h>

#include "packet-ber.h"
#include "packet-acse.h"

#include "tap.h"

#include "packet-sv.h"

#define PNAME  "IEC61850 Sampled Values"
#define PSNAME "SV"
#define PFNAME "sv"

/* see IEC61850-8-1 8.2 */
#define Q_VALIDITY_GOOD			(0x0U << 0)
#define Q_VALIDITY_INVALID_BW		(0x1U << 0)
#define Q_VALIDITY_INVALID		(0x2U << 0)
#define Q_VALIDITY_QUESTIONABLE		(0x3U << 0)
#define Q_VALIDITY_MASK			(0x3U << 0)

#define Q_OVERFLOW			(1U << 2)
#define Q_OUTOFRANGE			(1U << 3)
#define Q_BADREFERENCE			(1U << 4)
#define Q_OSCILLATORY			(1U << 5)
#define Q_FAILURE			(1U << 6)
#define Q_OLDDATA			(1U << 7)
#define Q_INCONSISTENT			(1U << 8)
#define Q_INACCURATE			(1U << 9)

#define Q_SOURCE_PROCESS		(0U << 10)
#define Q_SOURCE_SUBSTITUTED		(1U << 10)
#define Q_SOURCE_MASK			(1U << 10)

#define Q_TEST				(1U << 11)
#define Q_OPERATORBLOCKED		(1U << 12)

/* see UCA Implementation Guideline for IEC 61850-9-2 */
#define Q_DERIVED			(1U << 13)

/* Bit fields in the Reserved attributes */
#define F_RESERVE1_S_BIT  0x8000


void proto_register_sv(void);
void proto_reg_handoff_sv(void);

/* Data for SV tap */
static int sv_tap;
static sv_frame_data sv_data;

/* Initialize the protocol and registered fields */
static int proto_sv;
static int hf_sv_appid;
static int hf_sv_length;
static int hf_sv_reserve1;
static int hf_sv_reserve1_s_bit;
static int hf_sv_reserve2;
static int hf_sv_phmeas_instmag_i;
static int hf_sv_phsmeas_q;
static int hf_sv_phsmeas_q_validity;
static int hf_sv_phsmeas_q_overflow;
static int hf_sv_phsmeas_q_outofrange;
static int hf_sv_phsmeas_q_badreference;
static int hf_sv_phsmeas_q_oscillatory;
static int hf_sv_phsmeas_q_failure;
static int hf_sv_phsmeas_q_olddata;
static int hf_sv_phsmeas_q_inconsistent;
static int hf_sv_phsmeas_q_inaccurate;
static int hf_sv_phsmeas_q_source;
static int hf_sv_phsmeas_q_test;
static int hf_sv_phsmeas_q_operatorblocked;
static int hf_sv_phsmeas_q_derived;
static int hf_sv_gmidentity;
static int hf_sv_gmidentity_manuf;

static int hf_sv_savPdu;                          /* SavPdu */
static int hf_sv_noASDU;                          /* INTEGER_0_65535 */
static int hf_sv_seqASDU;                         /* SEQUENCE_OF_ASDU */
static int hf_sv_seqASDU_item;                    /* ASDU */
static int hf_sv_svID;                            /* VisibleString */
static int hf_sv_datSet;                          /* VisibleString */
static int hf_sv_smpCnt;                          /* T_smpCnt */
static int hf_sv_confRev;                         /* INTEGER_0_4294967295 */
static int hf_sv_refrTm;                          /* UtcTime */
static int hf_sv_smpSynch;                        /* T_smpSynch */
static int hf_sv_smpRate;                         /* INTEGER_0_65535 */
static int hf_sv_seqData;                         /* Data */
static int hf_sv_smpMod;                          /* T_smpMod */
static int hf_sv_gmidData;                        /* GmidData */

/* Initialize the subtree pointers */
static int ett_sv;
static int ett_phsmeas;
static int ett_phsmeas_q;
static int ett_gmidentity;
static int ett_reserve1;


static int ett_sv_SampledValues;
static int ett_sv_SavPdu;
static int ett_sv_SEQUENCE_OF_ASDU;
static int ett_sv_ASDU;

static expert_field ei_sv_mal_utctime;
static expert_field ei_sv_zero_pdu;
static expert_field ei_sv_mal_gmidentity;

static bool sv_decode_data_as_phsmeas;

static dissector_handle_t sv_handle;

/*
 * See
 *   IEC 61850-9-2 Edition 2.1 2020-02,
 *   Section 8.6 Definitions for basic data types – Presentation layer functionality,
 *   Table 21
 *
 * Be aware that in the specification the bits are numbered in reverse (it
 * specifies the least significant bit as bit 31 instead of as bit 0)!
 */

static const value_string sv_q_validity_vals[] = {
	{ 0, "good" },
	{ 1, "invalid (backwards compatible)" },
	{ 2, "invalid" },
	{ 3, "questionable" },
	{ 0, NULL }
};

static const value_string sv_q_source_vals[] = {
	{ 0, "process" },
	{ 1, "substituted" },
	{ 0, NULL }
};

static int
dissect_PhsMeas1(bool implicit_tag, packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, int hf_id _U_)
{
	gint8 ber_class;
	bool pc;
	gint32 tag;
	guint32 len;
	proto_tree *subtree;
	gint32 value;
	guint32 qual;
	guint32 i;

	static int * const q_flags[] = {
		&hf_sv_phsmeas_q_validity,
		&hf_sv_phsmeas_q_overflow,
		&hf_sv_phsmeas_q_outofrange,
		&hf_sv_phsmeas_q_badreference,
		&hf_sv_phsmeas_q_oscillatory,
		&hf_sv_phsmeas_q_failure,
		&hf_sv_phsmeas_q_olddata,
		&hf_sv_phsmeas_q_inconsistent,
		&hf_sv_phsmeas_q_inaccurate,
		&hf_sv_phsmeas_q_source,
		&hf_sv_phsmeas_q_test,
		&hf_sv_phsmeas_q_operatorblocked,
		&hf_sv_phsmeas_q_derived,
		NULL
		};

	if (!implicit_tag) {
		offset=dissect_ber_identifier(pinfo, tree, tvb, offset, &ber_class, &pc, &tag);
		offset=dissect_ber_length(pinfo, tree, tvb, offset, &len, NULL);
	} else {
		len=tvb_reported_length_remaining(tvb, offset);
	}

	subtree = proto_tree_add_subtree(tree, tvb, offset, len, ett_phsmeas, NULL, "PhsMeas1");

	sv_data.num_phsMeas = 0;
	for (i = 0; i < len/8; i++) {
		if (tree && subtree) {
			value = tvb_get_ntohl(tvb, offset);
			qual = tvb_get_ntohl(tvb, offset + 4);

			proto_tree_add_item(subtree, hf_sv_phmeas_instmag_i, tvb, offset, 4, ENC_BIG_ENDIAN);
			proto_tree_add_bitmask(subtree, tvb, offset + 4, hf_sv_phsmeas_q, ett_phsmeas_q, q_flags, ENC_BIG_ENDIAN);

			if (i < IEC61850_SV_MAX_PHSMEAS_ENTRIES) {
				sv_data.phsMeas[i].value = value;
				sv_data.phsMeas[i].qual = qual;
				sv_data.num_phsMeas++;
			}
		}

		offset += 8;
	}

	return offset;
}



static int
dissect_sv_INTEGER_0_65535(bool implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
  offset = dissect_ber_integer(implicit_tag, actx, tree, tvb, offset, hf_index,
                                                NULL);

  return offset;
}



static int
dissect_sv_VisibleString(bool implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
  offset = dissect_ber_restricted_string(implicit_tag, BER_UNI_TAG_VisibleString,
                                            actx, tree, tvb, offset, hf_index,
                                            NULL);

  return offset;
}



static int
dissect_sv_T_smpCnt(bool implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
	guint32 value;
  offset = dissect_ber_integer(implicit_tag, actx, tree, tvb, offset, hf_index,
                                                &value);

	sv_data.smpCnt = value;

  return offset;
}



static int
dissect_sv_INTEGER_0_4294967295(bool implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
  offset = dissect_ber_integer(implicit_tag, actx, tree, tvb, offset, hf_index,
                                                NULL);

  return offset;
}



static int
dissect_sv_UtcTime(bool implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
	guint32 len;
	guint32 seconds;
	guint32	fraction;
	guint32 nanoseconds;
	nstime_t ts;
	gchar *	ptime;

	len = tvb_reported_length_remaining(tvb, offset);

	if(len != 8)
	{
		proto_tree_add_expert_format(tree, actx->pinfo, &ei_sv_mal_utctime, tvb, offset, len,
				"BER Error: malformed UTCTime encoding, length must be 8 bytes");
		if(hf_index > 0)
		{
			proto_tree_add_string(tree, hf_index, tvb, offset, len, "????");
		}
		return offset;
	}

	seconds = tvb_get_ntohl(tvb, offset);
	fraction = tvb_get_ntoh24(tvb, offset+4) * 0x100; /* Only 3 bytes are recommended */
	nanoseconds = (guint32)( ((guint64)fraction * G_GUINT64_CONSTANT(1000000000)) / G_GUINT64_CONSTANT(0x100000000) ) ;

	ts.secs = seconds;
	ts.nsecs = nanoseconds;

	ptime = abs_time_to_str(actx->pinfo->pool, &ts, ABSOLUTE_TIME_UTC, TRUE);

	if(hf_index > 0)
	{
		proto_tree_add_string(tree, hf_index, tvb, offset, len, ptime);
	}
	offset += 8;

  return offset;
}


static const value_string sv_T_smpSynch_vals[] = {
  {   0, "none" },
  {   1, "local" },
  {   2, "global" },
  { 0, NULL }
};


static int
dissect_sv_T_smpSynch(bool implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
	guint32 value;
  offset = dissect_ber_integer(implicit_tag, actx, tree, tvb, offset, hf_index,
                                                &value);

	sv_data.smpSynch = value;

  return offset;
}



static int
dissect_sv_Data(bool implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
	if (sv_decode_data_as_phsmeas) {
		offset = dissect_PhsMeas1(implicit_tag, actx->pinfo, tree, tvb, offset, hf_index);
	} else {
		offset = dissect_ber_octet_string(implicit_tag, actx, tree, tvb, offset, hf_index, NULL);
	}

  return offset;
}


static const value_string sv_T_smpMod_vals[] = {
  {   0, "samplesPerNormalPeriod" },
  {   1, "samplesPerSecond" },
  {   2, "secondsPerSample" },
  { 0, NULL }
};


static int
dissect_sv_T_smpMod(bool implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
	guint32 value;
  offset = dissect_ber_integer(implicit_tag, actx, tree, tvb, offset, hf_index,
                                                &value);

	sv_data.smpMod = value;

  return offset;
}



static int
dissect_sv_GmidData(bool implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
	guint32 len;
	proto_item  *gmidentity_ti;
	proto_tree  *gmidentity_tree;
	const gchar *manuf_name;

	len = tvb_reported_length_remaining(tvb, offset);

	if(len != 8)
	{
		proto_tree_add_expert_format(tree, actx->pinfo, &ei_sv_mal_gmidentity, tvb, offset, len,
				"BER Error: malformed gmIdentity encoding, length must be 8 bytes");
		if(hf_index > 0)
		{
			proto_tree_add_string(tree, hf_index, tvb, offset, len, "????");
		}
		return offset;
	}

	gmidentity_ti = proto_tree_add_item(tree, hf_sv_gmidentity, tvb, offset, 8, ENC_BIG_ENDIAN);

	/* EUI-64: vendor ID | 0xFF - 0xFE | card ID */
	if (tvb_get_ntohs(tvb, offset + 3) == 0xFFFE) {
		gmidentity_tree = proto_item_add_subtree(gmidentity_ti, ett_gmidentity);

		manuf_name = tvb_get_manuf_name(tvb, offset);
		proto_tree_add_bytes_format_value(gmidentity_tree, hf_sv_gmidentity_manuf, tvb, offset, 3, NULL, "%s", manuf_name);
	}

	offset += 8;

  return offset;
}


static const ber_sequence_t ASDU_sequence[] = {
  { &hf_sv_svID             , BER_CLASS_CON, 0, BER_FLAGS_IMPLTAG, dissect_sv_VisibleString },
  { &hf_sv_datSet           , BER_CLASS_CON, 1, BER_FLAGS_OPTIONAL|BER_FLAGS_IMPLTAG, dissect_sv_VisibleString },
  { &hf_sv_smpCnt           , BER_CLASS_CON, 2, BER_FLAGS_IMPLTAG, dissect_sv_T_smpCnt },
  { &hf_sv_confRev          , BER_CLASS_CON, 3, BER_FLAGS_IMPLTAG, dissect_sv_INTEGER_0_4294967295 },
  { &hf_sv_refrTm           , BER_CLASS_CON, 4, BER_FLAGS_OPTIONAL|BER_FLAGS_IMPLTAG, dissect_sv_UtcTime },
  { &hf_sv_smpSynch         , BER_CLASS_CON, 5, BER_FLAGS_OPTIONAL|BER_FLAGS_IMPLTAG, dissect_sv_T_smpSynch },
  { &hf_sv_smpRate          , BER_CLASS_CON, 6, BER_FLAGS_OPTIONAL|BER_FLAGS_IMPLTAG, dissect_sv_INTEGER_0_65535 },
  { &hf_sv_seqData          , BER_CLASS_CON, 7, BER_FLAGS_IMPLTAG, dissect_sv_Data },
  { &hf_sv_smpMod           , BER_CLASS_CON, 8, BER_FLAGS_OPTIONAL|BER_FLAGS_IMPLTAG, dissect_sv_T_smpMod },
  { &hf_sv_gmidData         , BER_CLASS_CON, 9, BER_FLAGS_OPTIONAL|BER_FLAGS_IMPLTAG, dissect_sv_GmidData },
  { NULL, 0, 0, 0, NULL }
};

static int
dissect_sv_ASDU(bool implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
  offset = dissect_ber_sequence(implicit_tag, actx, tree, tvb, offset,
                                   ASDU_sequence, hf_index, ett_sv_ASDU);

  return offset;
}


static const ber_sequence_t SEQUENCE_OF_ASDU_sequence_of[1] = {
  { &hf_sv_seqASDU_item     , BER_CLASS_UNI, BER_UNI_TAG_SEQUENCE, BER_FLAGS_NOOWNTAG, dissect_sv_ASDU },
};

static int
dissect_sv_SEQUENCE_OF_ASDU(bool implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
  offset = dissect_ber_sequence_of(implicit_tag, actx, tree, tvb, offset,
                                      SEQUENCE_OF_ASDU_sequence_of, hf_index, ett_sv_SEQUENCE_OF_ASDU);

  return offset;
}


static const ber_sequence_t SavPdu_sequence[] = {
  { &hf_sv_noASDU           , BER_CLASS_CON, 0, BER_FLAGS_IMPLTAG, dissect_sv_INTEGER_0_65535 },
  { &hf_sv_seqASDU          , BER_CLASS_CON, 2, BER_FLAGS_IMPLTAG, dissect_sv_SEQUENCE_OF_ASDU },
  { NULL, 0, 0, 0, NULL }
};

static int
dissect_sv_SavPdu(bool implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
  offset = dissect_ber_sequence(implicit_tag, actx, tree, tvb, offset,
                                   SavPdu_sequence, hf_index, ett_sv_SavPdu);

  return offset;
}


static const ber_choice_t SampledValues_choice[] = {
  {   0, &hf_sv_savPdu           , BER_CLASS_APP, 0, BER_FLAGS_IMPLTAG, dissect_sv_SavPdu },
  { 0, NULL, 0, 0, 0, NULL }
};

static int
dissect_sv_SampledValues(bool implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
  offset = dissect_ber_choice(actx, tree, tvb, offset,
                                 SampledValues_choice, hf_index, ett_sv_SampledValues,
                                 NULL);

  return offset;
}


/*
* Dissect SV PDUs inside a PPDU.
*/
static int
dissect_sv(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void* data _U_)
{
	int offset = 0;
	int old_offset;
	guint sv_length = 0;
	proto_item *item;
	proto_tree *tree;

	static int * const reserve1_flags[] = {
		&hf_sv_reserve1_s_bit,
		NULL
	};

	asn1_ctx_t asn1_ctx;

	asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, TRUE, pinfo);

	item = proto_tree_add_item(parent_tree, proto_sv, tvb, 0, -1, ENC_NA);
	tree = proto_item_add_subtree(item, ett_sv);

	col_set_str(pinfo->cinfo, COL_PROTOCOL, PNAME);
	col_clear(pinfo->cinfo, COL_INFO);

	/* APPID */
	proto_tree_add_item(tree, hf_sv_appid, tvb, offset, 2, ENC_BIG_ENDIAN);

	/* Length */
	proto_tree_add_item_ret_uint(tree, hf_sv_length, tvb, offset + 2, 2, ENC_BIG_ENDIAN, &sv_length);

	/* Reserved 1 */
	proto_tree_add_bitmask(tree, tvb, offset + 4, hf_sv_reserve1, ett_reserve1,
						reserve1_flags, ENC_BIG_ENDIAN);


	/* Reserved 2 */
	proto_tree_add_item(tree, hf_sv_reserve2, tvb, offset + 6, 2, ENC_BIG_ENDIAN);

	offset = 8;
	set_actual_length(tvb, sv_length);
	while (tvb_reported_length_remaining(tvb, offset) > 0) {
		old_offset = offset;
		offset = dissect_sv_SampledValues(FALSE, tvb, offset, &asn1_ctx , tree, -1);
		if (offset == old_offset) {
			proto_tree_add_expert(tree, pinfo, &ei_sv_zero_pdu, tvb, offset, -1);
			break;
		}
	}

	tap_queue_packet(sv_tap, pinfo, &sv_data);
	return tvb_captured_length(tvb);
}


/*--- proto_register_sv -------------------------------------------*/
void proto_register_sv(void) {

	/* List of fields */
	static hf_register_info hf[] = {
		{ &hf_sv_appid,
		{ "APPID",	"sv.appid", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }},

		{ &hf_sv_length,
		{ "Length",	"sv.length", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},

		{ &hf_sv_reserve1,
		{ "Reserved 1",	"sv.reserve1", FT_UINT16, BASE_HEX_DEC, NULL, 0x0, NULL, HFILL }},

		{ &hf_sv_reserve1_s_bit,
		{ "Simulated",	"sv.reserve1.s_bit",
		  FT_BOOLEAN, 16, NULL, F_RESERVE1_S_BIT, NULL, HFILL } },

		{ &hf_sv_reserve2,
		{ "Reserved 2",	"sv.reserve2", FT_UINT16, BASE_HEX_DEC, NULL, 0x0, NULL, HFILL }},

		{ &hf_sv_phmeas_instmag_i,
		{ "value", "sv.meas_value", FT_INT32, BASE_DEC, NULL, 0x0, NULL, HFILL}},

		{ &hf_sv_phsmeas_q,
		{ "quality", "sv.meas_quality", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL}},

		{ &hf_sv_phsmeas_q_validity,
		{ "validity", "sv.meas_quality.validity", FT_UINT32, BASE_HEX, VALS(sv_q_validity_vals), Q_VALIDITY_MASK, NULL, HFILL}},

		{ &hf_sv_phsmeas_q_overflow,
		{ "overflow", "sv.meas_quality.overflow", FT_BOOLEAN, 32, NULL, Q_OVERFLOW, NULL, HFILL}},

		{ &hf_sv_phsmeas_q_outofrange,
		{ "out of range", "sv.meas_quality.outofrange", FT_BOOLEAN, 32, NULL, Q_OUTOFRANGE, NULL, HFILL}},

		{ &hf_sv_phsmeas_q_badreference,
		{ "bad reference", "sv.meas_quality.badreference", FT_BOOLEAN, 32, NULL, Q_BADREFERENCE, NULL, HFILL}},

		{ &hf_sv_phsmeas_q_oscillatory,
		{ "oscillatory", "sv.meas_quality.oscillatory", FT_BOOLEAN, 32, NULL, Q_OSCILLATORY, NULL, HFILL}},

		{ &hf_sv_phsmeas_q_failure,
		{ "failure", "sv.meas_quality.failure", FT_BOOLEAN, 32, NULL, Q_FAILURE, NULL, HFILL}},

		{ &hf_sv_phsmeas_q_olddata,
		{ "old data", "sv.meas_quality.olddata", FT_BOOLEAN, 32, NULL, Q_OLDDATA, NULL, HFILL}},

		{ &hf_sv_phsmeas_q_inconsistent,
		{ "inconsistent", "sv.meas_quality.inconsistent", FT_BOOLEAN, 32, NULL, Q_INCONSISTENT, NULL, HFILL}},

		{ &hf_sv_phsmeas_q_inaccurate,
		{ "inaccurate", "sv.meas_quality.inaccurate", FT_BOOLEAN, 32, NULL, Q_INACCURATE, NULL, HFILL}},

		{ &hf_sv_phsmeas_q_source,
		{ "source", "sv.meas_quality.source", FT_UINT32, BASE_HEX, VALS(sv_q_source_vals), Q_SOURCE_MASK, NULL, HFILL}},

		{ &hf_sv_phsmeas_q_test,
		{ "test", "sv.meas_quality.test", FT_BOOLEAN, 32, NULL, Q_TEST, NULL, HFILL}},

		{ &hf_sv_phsmeas_q_operatorblocked,
		{ "operator blocked", "sv.meas_quality.operatorblocked", FT_BOOLEAN, 32, NULL, Q_OPERATORBLOCKED, NULL, HFILL}},

		{ &hf_sv_phsmeas_q_derived,
		{ "derived", "sv.meas_quality.derived", FT_BOOLEAN, 32, NULL, Q_DERIVED, NULL, HFILL}},

		{ &hf_sv_gmidentity,
		{ "gmIdentity", "sv.gmidentity", FT_UINT64, BASE_HEX, NULL, 0x00, NULL, HFILL}},

		{ &hf_sv_gmidentity_manuf,
		{ "MAC Vendor", "sv.gmidentity_manuf", FT_BYTES, BASE_NONE, NULL, 0x00, NULL, HFILL}},


    { &hf_sv_savPdu,
      { "savPdu", "sv.savPdu_element",
        FT_NONE, BASE_NONE, NULL, 0,
        NULL, HFILL }},
    { &hf_sv_noASDU,
      { "noASDU", "sv.noASDU",
        FT_UINT32, BASE_DEC, NULL, 0,
        "INTEGER_0_65535", HFILL }},
    { &hf_sv_seqASDU,
      { "seqASDU", "sv.seqASDU",
        FT_UINT32, BASE_DEC, NULL, 0,
        "SEQUENCE_OF_ASDU", HFILL }},
    { &hf_sv_seqASDU_item,
      { "ASDU", "sv.ASDU_element",
        FT_NONE, BASE_NONE, NULL, 0,
        NULL, HFILL }},
    { &hf_sv_svID,
      { "svID", "sv.svID",
        FT_STRING, BASE_NONE, NULL, 0,
        "VisibleString", HFILL }},
    { &hf_sv_datSet,
      { "datSet", "sv.datSet",
        FT_STRING, BASE_NONE, NULL, 0,
        "VisibleString", HFILL }},
    { &hf_sv_smpCnt,
      { "smpCnt", "sv.smpCnt",
        FT_UINT32, BASE_DEC, NULL, 0,
        NULL, HFILL }},
    { &hf_sv_confRev,
      { "confRev", "sv.confRev",
        FT_UINT32, BASE_DEC, NULL, 0,
        "INTEGER_0_4294967295", HFILL }},
    { &hf_sv_refrTm,
      { "refrTm", "sv.refrTm",
        FT_STRING, BASE_NONE, NULL, 0,
        "UtcTime", HFILL }},
    { &hf_sv_smpSynch,
      { "smpSynch", "sv.smpSynch",
        FT_INT32, BASE_DEC, VALS(sv_T_smpSynch_vals), 0,
        NULL, HFILL }},
    { &hf_sv_smpRate,
      { "smpRate", "sv.smpRate",
        FT_UINT32, BASE_DEC, NULL, 0,
        "INTEGER_0_65535", HFILL }},
    { &hf_sv_seqData,
      { "seqData", "sv.seqData",
        FT_BYTES, BASE_NONE, NULL, 0,
        "Data", HFILL }},
    { &hf_sv_smpMod,
      { "smpMod", "sv.smpMod",
        FT_INT32, BASE_DEC, VALS(sv_T_smpMod_vals), 0,
        NULL, HFILL }},
    { &hf_sv_gmidData,
      { "gmidData", "sv.gmidData",
        FT_BYTES, BASE_NONE, NULL, 0,
        NULL, HFILL }},
	};

	/* List of subtrees */
	static gint *ett[] = {
		&ett_sv,
		&ett_phsmeas,
		&ett_phsmeas_q,
		&ett_gmidentity,
		&ett_reserve1,
    &ett_sv_SampledValues,
    &ett_sv_SavPdu,
    &ett_sv_SEQUENCE_OF_ASDU,
    &ett_sv_ASDU,
	};

	static ei_register_info ei[] = {
		{ &ei_sv_mal_utctime, { "sv.malformed.utctime", PI_MALFORMED, PI_WARN, "BER Error: malformed UTCTime encoding", EXPFILL }},
		{ &ei_sv_zero_pdu, { "sv.zero_pdu", PI_PROTOCOL, PI_ERROR, "Internal error, zero-byte SV PDU", EXPFILL }},
		{ &ei_sv_mal_gmidentity, { "sv.malformed.gmidentity", PI_MALFORMED, PI_WARN, "BER Error: malformed gmIdentity encoding", EXPFILL }},
	};

	expert_module_t* expert_sv;
	module_t *sv_module;

	/* Register protocol */
	proto_sv = proto_register_protocol(PNAME, PSNAME, PFNAME);
	sv_handle = register_dissector("sv", dissect_sv, proto_sv);

	/* Register fields and subtrees */
	proto_register_field_array(proto_sv, hf, array_length(hf));
	proto_register_subtree_array(ett, array_length(ett));
	expert_sv = expert_register_protocol(proto_sv);
	expert_register_field_array(expert_sv, ei, array_length(ei));
	sv_module = prefs_register_protocol(proto_sv, NULL);
	prefs_register_bool_preference(sv_module, "decode_data_as_phsmeas",
		"Force decoding of seqData as PhsMeas",
		NULL, &sv_decode_data_as_phsmeas);

	/* Register tap */
	sv_tap = register_tap("sv");
}

/*--- proto_reg_handoff_sv --- */
void proto_reg_handoff_sv(void) {
	dissector_add_uint("ethertype", ETHERTYPE_IEC61850_SV, sv_handle);
}