/* packet-pn-ptcp.c
 * Routines for PN-PTCP (PROFINET Precision Time Clock Protocol)
 * packet dissection.
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"


#include <glib.h>
#include <epan/packet.h>
#include <epan/dissectors/packet-dcerpc.h>
#include <epan/oui.h>

#include "packet-pn.h"

void proto_register_pn_ptcp(void);
void proto_reg_handoff_pn_ptcp(void);

static int proto_pn_ptcp = -1;

static int hf_pn_ptcp_header = -1;
static int hf_pn_ptcp_block = -1;
static int hf_pn_ptcp_block_tlvheader = -1;

static int hf_pn_ptcp_res1 = -1;
static int hf_pn_ptcp_res2 = -1;
static int hf_pn_ptcp_delay10ns = -1;
static int hf_pn_ptcp_seq_id = -1;
static int hf_pn_ptcp_delay1ns_byte = -1;
static int hf_pn_ptcp_delay1ns_fup = -1;
static int hf_pn_ptcp_delay1ns = -1;

static int hf_pn_ptcp_tl_length = -1;
static int hf_pn_ptcp_tl_type = -1;

static int hf_pn_ptcp_master_source_address = -1;
static int hf_pn_ptcp_subdomain_uuid = -1;

static int hf_pn_ptcp_port_mac_address = -1;

static int hf_pn_ptcp_t2portrxdelay = -1;
static int hf_pn_ptcp_t3porttxdelay = -1;

static int hf_pn_ptcp_t2timestamp = -1;

static int hf_pn_ptcp_epoch_number = -1;
static int hf_pn_ptcp_seconds = -1;
static int hf_pn_ptcp_nanoseconds = -1;

static int hf_pn_ptcp_flags = -1;
static int hf_pn_ptcp_currentutcoffset = -1;

static int hf_pn_ptcp_master_priority1 = -1;
static int hf_pn_ptcp_master_priority_level = -1;
static int hf_pn_ptcp_master_priority1_res = -1;
static int hf_pn_ptcp_master_priority1_act =-1;

static int hf_pn_ptcp_master_priority2 = -1;
static int hf_pn_ptcp_clock_class = -1;
static int hf_pn_ptcp_clock_accuracy = -1;
static int hf_pn_ptcp_clockvariance = -1;

static int hf_pn_ptcp_oui = -1;
static int hf_pn_ptcp_profinet_subtype = -1;
static int hf_pn_ptcp_irdata_uuid = -1;

static gint ett_pn_ptcp = -1;
static gint ett_pn_ptcp_header = -1;
static gint ett_pn_ptcp_block = -1;
static gint ett_pn_ptcp_block_header = -1;

#define OUI_PROFINET_MULTICAST   0x010ECF   /* PROFIBUS Nutzerorganisation e.V. */


#define PN_PTCP_BT_END              0x00
#define PN_PTCP_BT_SUBDOMAIN        0x01
#define PN_PTCP_BT_TIME             0x02
#define PN_PTCP_BT_TIME_EXTENSION   0x03
#define PN_PTCP_BT_MASTER           0x04
#define PN_PTCP_BT_PORT_PARAMETER   0x05
#define PN_PTCP_BT_DELAY_PARAMETER  0x06
#define PN_PTCP_BT_PORT_TIME        0x07
#define PN_PTCP_BT_OPTION           0x7F
#define PN_PTCP_BT_RTDATA           0x7F


static const value_string pn_ptcp_block_type[] = {
    { PN_PTCP_BT_END,             "End" },
    { PN_PTCP_BT_SUBDOMAIN,       "Subdomain"},
    { PN_PTCP_BT_TIME,            "Time"},
    { PN_PTCP_BT_TIME_EXTENSION,  "TimeExtension"},
    { PN_PTCP_BT_MASTER,          "Master"},
    { PN_PTCP_BT_PORT_PARAMETER,  "PortParameter"},
    { PN_PTCP_BT_DELAY_PARAMETER, "DelayParameter"},
    { PN_PTCP_BT_PORT_TIME,       "PortTime"},
    /*0x08 - 0x7E Reserved */
    { PN_PTCP_BT_OPTION,          "Organizationally Specific"},
    { 0, NULL }
};

static const value_string pn_ptcp_oui_vals[] = {
    { OUI_PROFINET,               "PROFINET" },
    { OUI_PROFINET_MULTICAST,     "PROFINET" },
    { 0, NULL }
};

static const value_string pn_ptcp_master_prio1_vals[] = {
    { 0x00, "Sync slave" },
    { 0x01, "Primary master" },
    { 0x02, "Secondary master" },
    { 0x03, "Reserved" },
    { 0x04, "Reserved" },
    { 0x05, "Reserved" },
    { 0x06, "Reserved" },
    { 0x07, "Reserved" },
    { 0, NULL }
};

static const value_string pn_ptcp_master_prio1_levels[] = {
    { 0x00, "Level 0 (highest)" },
    { 0x01, "Level 1" },
    { 0x02, "Level 2" },
    { 0x03, "Level 3" },
    { 0x04, "Level 4" },
    { 0x05, "Level 5" },
    { 0x06, "Level 6" },
    { 0x07, "Level 7 (lowest)" },
    { 0, NULL }
};

static const value_string pn_ptcp_master_prio1_vals_active[] = {
    { 0x00, "inactive" },
    { 0x01, "active" },
    { 0, NULL }
};

#if 0
static const value_string pn_ptcp_master_prio1_short_vals[] = {
    { 0x01, "Primary" },
    { 0x02, "Secondary" },
    { 0, NULL }
};
#endif

static const value_string pn_ptcp_master_prio2_vals[] = {
    { 0xFF, "Default" },
    { 0, NULL }
};

static const value_string pn_ptcp_clock_class_vals[] = {
    { 0xFF, "Slave-only clock" },
    { 0, NULL }
};

static const value_string pn_ptcp_clock_accuracy_vals[] = {
    { 0x20, "25ns" },
    { 0x21, "100ns (Default)" },
    { 0x22, "250ns" },
    { 0x23, "1us" },
    { 0x24, "2.5us" },
    { 0x25, "10us" },
    { 0x26, "25us" },
    { 0x27, "100us" },
    { 0x28, "250us" },
    { 0x29, "1ms" },
    { 0xFE, "Unknown" },
    { 0, NULL }
};

static const value_string pn_ptcp_profinet_subtype_vals[] = {
    { 0x01, "RTData" },
    { 0, NULL }
};




static int
dissect_PNPTCP_TLVHeader(tvbuff_t *tvb, int offset,
        packet_info *pinfo, proto_tree *tree, proto_item *item _U_, guint16 *type, guint16 *length)
{
    guint16 tl_type;
    guint16 tl_length;


    /* Type */
    dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_ptcp_tl_type, &tl_type);
    *type = tl_type >> 9;

    /* Length */
    offset  = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_ptcp_tl_length, &tl_length);
    *length = tl_length & 0x1FF;

    return offset;
}


static int
dissect_PNPTCP_Subdomain(tvbuff_t *tvb, int offset,
        packet_info *pinfo, proto_tree *tree, proto_item *item, guint16 u16FrameID)
{
    guint8   mac[6];
    e_uuid_t uuid;


    /* MasterSourceAddress */
    offset = dissect_pn_mac(tvb, offset, pinfo, tree, hf_pn_ptcp_master_source_address, mac);

    /* SubdomainUUID */
    offset = dissect_pn_uuid(tvb, offset, pinfo, tree, hf_pn_ptcp_subdomain_uuid, &uuid);

    if ((u16FrameID == 0xff00) || (u16FrameID == 0xff01)) {
        col_append_fstr(pinfo->cinfo, COL_INFO, ", Master=%02x:%02x:%02x:%02x:%02x:%02x",
            mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
    }

    proto_item_append_text(item, ": MasterSource=%02x:%02x:%02x:%02x:%02x:%02x",
        mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);

    proto_item_append_text(item, ", Subdomain=%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
        uuid.Data1, uuid.Data2, uuid.Data3,
        uuid.Data4[0], uuid.Data4[1],
        uuid.Data4[2], uuid.Data4[3],
        uuid.Data4[4], uuid.Data4[5],
        uuid.Data4[6], uuid.Data4[7]);

    return offset;
}


static int
dissect_PNPTCP_Time(tvbuff_t *tvb, int offset,
        packet_info *pinfo, proto_tree *tree, proto_item *item)
{
    guint16 EpochNumber;
    guint32 Seconds;
    guint32 NanoSeconds;


    /* EpochNumber */
    offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_ptcp_epoch_number, &EpochNumber);

    /* Seconds */
    offset = dissect_pn_uint32(tvb, offset, pinfo, tree, hf_pn_ptcp_seconds, &Seconds);

    /* NanoSeconds */
    offset = dissect_pn_uint32(tvb, offset, pinfo, tree, hf_pn_ptcp_nanoseconds, &NanoSeconds);

    proto_item_append_text(item, ": Seconds=%u NanoSeconds=%u EpochNumber=%u",
        Seconds, NanoSeconds, EpochNumber);

    col_append_fstr(pinfo->cinfo, COL_INFO, ", Time: %4us %09uns, Epoch: %u",
        Seconds, NanoSeconds, EpochNumber);

    return offset;
}


static int
dissect_PNPTCP_TimeExtension(tvbuff_t *tvb, int offset,
        packet_info *pinfo, proto_tree *tree, proto_item *item)
{
    guint16 Flags;
    guint16 CurrentUTCOffset;


    /* Flags */
    offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_ptcp_flags, &Flags);

    /* CurrentUTCOffset */
    offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_ptcp_currentutcoffset, &CurrentUTCOffset);

    /* Padding */
    offset = dissect_pn_align4(tvb, offset, pinfo, tree);

    proto_item_append_text(item, ": Flags=0x%x, CurrentUTCOffset=%u", Flags, CurrentUTCOffset);

    return offset;
}


static int
dissect_PNPTCP_Master(tvbuff_t *tvb, int offset,
        packet_info *pinfo, proto_tree *tree, proto_item *item)
{
    guint8 MasterPriority1;
    guint8 MasterPriority2;
    guint8 ClockClass;
    guint8 ClockAccuracy;
    gint16 ClockVariance;


    /* MasterPriority1 is a bit field */
    /* Bit 0 - 2: PTCP_MasterPriority1.Priority */
    dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_ptcp_master_priority1, &MasterPriority1);
    /* Bit 3 - 5: PTCP_MasterPriority1.Level */
    dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_ptcp_master_priority_level, &MasterPriority1);
    /* Bit 6: PTCP_MasterPriority1.Reserved */
    dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_ptcp_master_priority1_res, &MasterPriority1);
    /* Bit 7: PTCP_MasterPriority1.Active */
    offset = dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_ptcp_master_priority1_act, &MasterPriority1);

    /* MasterPriority2 */
    offset = dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_ptcp_master_priority2, &MasterPriority2);

    /* ClockClass */
    offset = dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_ptcp_clock_class, &ClockClass);

    /* ClockAccuracy */
    offset = dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_ptcp_clock_accuracy, &ClockAccuracy);

    /* ClockVariance */
    offset = dissect_pn_int16(tvb, offset, pinfo, tree, hf_pn_ptcp_clockvariance, &ClockVariance);

    /* Padding */
    offset = dissect_pn_align4(tvb, offset, pinfo, tree);

    col_append_fstr(pinfo->cinfo, COL_INFO, ", Prio1=\"%s\"",
        val_to_str(MasterPriority1 & 0x7, pn_ptcp_master_prio1_vals, "(Reserved: 0x%x)"));

    if ((MasterPriority1 & 0x80) == 0) {
        proto_item_append_text(item, ": Prio1=\"%s\", Prio2=%s, Clock: Class=\"%s\", Accuracy=%s, Variance=%d",
            val_to_str(MasterPriority1 & 0x7, pn_ptcp_master_prio1_vals, "(Reserved: 0x%x)"),
            val_to_str(MasterPriority2, pn_ptcp_master_prio2_vals, "(Reserved: 0x%x)"),
            val_to_str(ClockClass, pn_ptcp_clock_class_vals, "(Reserved: 0x%x)"),
            val_to_str(ClockAccuracy, pn_ptcp_clock_accuracy_vals, "(Reserved: 0x%x)"),
            ClockVariance);
    }
    else {
        col_append_str(pinfo->cinfo, COL_INFO, " active");
        proto_item_append_text(item, ": Prio1=\"%s\" is active, Prio2=%s, Clock: Class=\"%s\", Accuracy=%s, Variance=%d",
            val_to_str(MasterPriority1 & 0x7, pn_ptcp_master_prio1_vals, "(Reserved: 0x%x)"),
            val_to_str(MasterPriority2, pn_ptcp_master_prio2_vals, "(Reserved: 0x%x)"),
            val_to_str(ClockClass, pn_ptcp_clock_class_vals, "(Reserved: 0x%x)"),
            val_to_str(ClockAccuracy, pn_ptcp_clock_accuracy_vals, "(Reserved: 0x%x)"),
            ClockVariance);
    }


    return offset;
}


static int
dissect_PNPTCP_PortParameter(tvbuff_t *tvb, int offset,
        packet_info *pinfo, proto_tree *tree, proto_item *item)
{
    guint32 t2portrxdelay;
    guint32 t3porttxdelay;


    /* Padding */
    offset = dissect_pn_align4(tvb, offset, pinfo, tree);

    /* T2PortRxDelay */
    offset = dissect_pn_uint32(tvb, offset, pinfo, tree, hf_pn_ptcp_t2portrxdelay, &t2portrxdelay);

    /* T3PortTxDelay */
    offset = dissect_pn_uint32(tvb, offset, pinfo, tree, hf_pn_ptcp_t3porttxdelay, &t3porttxdelay);

    proto_item_append_text(item, ": T2PortRxDelay=%uns, T3PortTxDelay=%uns",
        t2portrxdelay, t3porttxdelay);

    col_append_fstr(pinfo->cinfo, COL_INFO, ", T2Rx=%uns, T3Tx=%uns",
        t2portrxdelay, t3porttxdelay);

    return offset;
}


static int
dissect_PNPTCP_DelayParameter(tvbuff_t *tvb, int offset,
        packet_info *pinfo, proto_tree *tree, proto_item *item)
{
    guint8 mac[6];


    /* PortMACAddress */
    offset = dissect_pn_mac(tvb, offset, pinfo, tree, hf_pn_ptcp_port_mac_address, mac);

    /* Padding */
    offset = dissect_pn_align4(tvb, offset, pinfo, tree);


    proto_item_append_text(item, ": PortMAC=%02x:%02x:%02x:%02x:%02x:%02x",
        mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);

    col_append_fstr(pinfo->cinfo, COL_INFO, ", PortMAC=%02x:%02x:%02x:%02x:%02x:%02x",
        mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);

    return offset;
}


static int
dissect_PNPTCP_PortTime(tvbuff_t *tvb, int offset,
        packet_info *pinfo, proto_tree *tree, proto_item *item)
{
    guint32 t2timestamp;


    /* Padding */
    offset = dissect_pn_align4(tvb, offset, pinfo, tree);

    /* T2TimeStamp */
    offset = dissect_pn_uint32(tvb, offset, pinfo, tree, hf_pn_ptcp_t2timestamp, &t2timestamp);

    proto_item_append_text(item, ": T2TimeStamp=%uns", t2timestamp);

    col_append_fstr(pinfo->cinfo, COL_INFO, ", T2TS=%uns", t2timestamp);

    return offset;
}


static int
dissect_PNPTCP_Option_PROFINET(tvbuff_t *tvb, int offset,
        packet_info *pinfo, proto_tree *tree, proto_item *item, guint16 length)
{
    guint8   subType;
    e_uuid_t uuid;

    /* OUI already dissected! */

    /* SubType */
    offset  = dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_ptcp_profinet_subtype, &subType);
    length -= 1;

    switch (subType) {
    case 1: /* RTData */
        /* Padding */
        offset = dissect_pn_align4(tvb, offset, pinfo, tree);

        /* IRDataUUID */
        offset = dissect_pn_uuid(tvb, offset, pinfo, tree, hf_pn_ptcp_irdata_uuid, &uuid);
        proto_item_append_text(item, ": IRDataUUID=%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
                                      uuid.Data1, uuid.Data2, uuid.Data3,
                                      uuid.Data4[0], uuid.Data4[1],
                                      uuid.Data4[2], uuid.Data4[3],
                                      uuid.Data4[4], uuid.Data4[5],
                                      uuid.Data4[6], uuid.Data4[7]);

        break;
    default:
        offset = dissect_pn_undecoded(tvb, offset, pinfo, tree, length);
        break;
    }

    return offset;
}


static int
dissect_PNPTCP_Option(tvbuff_t *tvb, int offset,
        packet_info *pinfo, proto_tree *tree, proto_item *item, guint16 length)
{
    guint32 oui;


    /* verify remaining TLV length */
    if (length < 4)
    {
        /* too short */
        offset = dissect_pn_undecoded(tvb, offset, pinfo, tree, length);
        return (offset);
    }

    /* OUI (organizational unique id) */
    offset  = dissect_pn_oid(tvb, offset, pinfo,tree, hf_pn_ptcp_oui, &oui);
    length -= 3;

    switch (oui)
    {
    case OUI_PROFINET:
    case OUI_PROFINET_MULTICAST:
            proto_item_append_text(item, ": PROFINET");
            offset = dissect_PNPTCP_Option_PROFINET(tvb, offset, pinfo, tree, item, length);
            break;
    default:
            /* SubType */
            offset = dissect_pn_undecoded(tvb, offset, pinfo, tree, length);
    }

    return (offset);
}


static int
dissect_PNPTCP_block(tvbuff_t *tvb, int offset,
        packet_info *pinfo, proto_tree *tree, proto_item *item _U_, gboolean *end, guint16 u16FrameID)
{
    guint16     type;
    guint16     length;

    proto_item *sub_item;
    proto_tree *sub_tree;
    proto_item *tlvheader_item;
    proto_tree *tlvheader_tree;
    guint32     u32SubStart;


    *end = FALSE;

    /* block subtree */
    sub_item    = proto_tree_add_item(tree, hf_pn_ptcp_block, tvb, offset, 0, ENC_NA);
    sub_tree    = proto_item_add_subtree(sub_item, ett_pn_ptcp_block);
    u32SubStart = offset;

    /* tlvheader subtree */
    tlvheader_item = proto_tree_add_item(sub_tree, hf_pn_ptcp_block_tlvheader, tvb, offset, 2 /* len */, ENC_NA);
    tlvheader_tree = proto_item_add_subtree(tlvheader_item, ett_pn_ptcp_block_header);

    offset = dissect_PNPTCP_TLVHeader(tvb, offset, pinfo, tlvheader_tree, sub_item, &type, &length);

    proto_item_set_text(sub_item, "%s",
        val_to_str(type, pn_ptcp_block_type, "Unknown"));

    proto_item_append_text(tlvheader_item, ": Type=%s (%x), Length=%u",
        val_to_str(type, pn_ptcp_block_type, "Unknown"), type, length);

    switch (type) {
    case 0x00: /* End, no content */
        *end = TRUE;
        break;
    case 0x01: /* Subdomain */
        dissect_PNPTCP_Subdomain(tvb, offset, pinfo, sub_tree, sub_item, u16FrameID);
        break;
    case 0x02: /* Time */
        dissect_PNPTCP_Time(tvb, offset, pinfo, sub_tree, sub_item);
        break;
    case 0x03: /* TimeExtension */
        dissect_PNPTCP_TimeExtension(tvb, offset, pinfo, sub_tree, sub_item);
        break;
    case 0x04: /* Master */
        dissect_PNPTCP_Master(tvb, offset, pinfo, sub_tree, sub_item);
        break;
    case 0x05: /* PortParameter */
        dissect_PNPTCP_PortParameter(tvb, offset, pinfo, sub_tree, sub_item);
        break;
    case 0x06: /* DelayParameter */
        dissect_PNPTCP_DelayParameter(tvb, offset, pinfo, sub_tree, sub_item);
        break;
    case 0x07: /* PortTime */
        dissect_PNPTCP_PortTime(tvb, offset, pinfo, sub_tree, sub_item);
        break;
    case 0x7F: /* Organizational Specific */
        dissect_PNPTCP_Option(tvb, offset, pinfo, sub_tree, sub_item, length);
        break;
    default:
        offset = dissect_pn_undecoded(tvb, offset, pinfo, tree, length);
    }
    offset += length;

    proto_item_set_len(sub_item, offset - u32SubStart);

    return offset;
}


static int
dissect_PNPTCP_blocks(tvbuff_t *tvb, int offset,
        packet_info *pinfo, proto_tree *tree, proto_item *item, guint16 u16FrameID)
{
    gboolean end = FALSE;

    /* as long as we have some bytes, try a new block */
    while (!end) {
        offset = dissect_PNPTCP_block(tvb, offset, pinfo, tree, item, &end, u16FrameID);
    }

    return offset;
}


static int
dissect_PNPTCP_FollowUpPDU(tvbuff_t *tvb, int offset,
        packet_info *pinfo, proto_tree *tree, proto_item *item, guint16 u16FrameID,
        const char *name, const char *name_short)
{
    proto_item *header_item;
    proto_tree *header_tree;
    guint16     seq_id;
    gint32      delay1ns_fup;


    /* dissect the header */
    header_item = proto_tree_add_item(tree, hf_pn_ptcp_header, tvb, offset, 20 /* len */, ENC_NA);
    header_tree = proto_item_add_subtree(header_item, ett_pn_ptcp_header);

    /* Padding 12 bytes */
    offset = dissect_pn_padding(tvb, offset, pinfo, header_tree, 12);

    /* SequenceID */
    offset = dissect_pn_uint16(tvb, offset, pinfo, header_tree, hf_pn_ptcp_seq_id, &seq_id);

    /* Padding */
    offset = dissect_pn_align4(tvb, offset, pinfo, header_tree);

    /* Delay1ns_FUP */
    offset = dissect_pn_int32(tvb, offset, pinfo, header_tree, hf_pn_ptcp_delay1ns_fup, &delay1ns_fup);

    col_append_fstr(pinfo->cinfo, COL_INFO, "%s, Seq=%3u, Delay=%11dns", name, seq_id, delay1ns_fup);
    proto_item_append_text(item, "%s: Sequence=%u, Delay=%dns", name_short, seq_id, delay1ns_fup);
    proto_item_append_text(header_item, ": Sequence=%u, Delay=%dns", seq_id, delay1ns_fup);


    /* dissect the TLV blocks */
    offset = dissect_PNPTCP_blocks(tvb, offset, pinfo, tree, item, u16FrameID);

    return offset;
}


static int
dissect_PNPTCP_RTSyncPDU(tvbuff_t *tvb, int offset,
        packet_info *pinfo, proto_tree *tree, proto_item *item, guint16 u16FrameID,
        const char *name, const char *name_short)
{
    proto_item *header_item;
    proto_tree *header_tree;
    guint32     res_1;
    guint32     res_2;
    guint32     delay10ns;
    guint16     seq_id;
    guint8      delay1ns_8;
    guint64     delay1ns_64;
    guint32     delay1ns_32;
    guint32     delayms;


    header_item = proto_tree_add_item(tree, hf_pn_ptcp_header, tvb, offset, 20 /* len */, ENC_NA);
    header_tree = proto_item_add_subtree(header_item, ett_pn_ptcp_header);

    /* Reserved_1 */
    offset = dissect_pn_uint32(tvb, offset, pinfo, header_tree, hf_pn_ptcp_res1, &res_1);

    /* Reserved_2 */
    offset = dissect_pn_uint32(tvb, offset, pinfo, header_tree, hf_pn_ptcp_res2, &res_2);

    /* Delay10ns */
    offset = dissect_pn_uint32(tvb, offset, pinfo, header_tree, hf_pn_ptcp_delay10ns, &delay10ns);

    /* SequenceID */
    offset = dissect_pn_uint16(tvb, offset, pinfo, header_tree, hf_pn_ptcp_seq_id, &seq_id);

    /* Delay1ns */
    offset = dissect_pn_uint8(tvb, offset, pinfo, header_tree, hf_pn_ptcp_delay1ns_byte, &delay1ns_8);

    /* Padding */
    offset = dissect_pn_align4(tvb, offset, pinfo, header_tree);

    /* Delay1ns */
    offset = dissect_pn_uint32(tvb, offset, pinfo, header_tree, hf_pn_ptcp_delay1ns, &delay1ns_32);

    /* Padding */
    offset = dissect_pn_align4(tvb, offset, pinfo, tree);


    delay1ns_64 = ((guint64) delay10ns) * 10 + delay1ns_8 + delay1ns_32;
    delayms     = (guint32) (delay1ns_64 / (1000 * 1000));

    col_append_fstr(pinfo->cinfo, COL_INFO, "%s, Seq=%3u, Delay=%11" G_GINT64_MODIFIER "uns",
        name, seq_id, delay1ns_64);
    proto_item_append_text(item, "%s: Sequence=%u, Delay=%" G_GINT64_MODIFIER "uns",
        name_short, seq_id, delay1ns_64);
    proto_item_append_text(header_item, ": Sequence=%u, Delay=%" G_GINT64_MODIFIER "uns",
        seq_id, delay1ns_64);

    if (delay1ns_64 != 0)
        proto_item_append_text(header_item, " (%u.%03u,%03u,%03u sec)",
            delayms / 1000,
            delayms % 1000,
            (delay10ns % (1000*100)) / 100,
            delay10ns % 100 * 10 + delay1ns_8);

    /* dissect the PDU */
    offset = dissect_PNPTCP_blocks(tvb, offset, pinfo, tree, item, u16FrameID);

    return offset;
}


static int
dissect_PNPTCP_AnnouncePDU(tvbuff_t *tvb, int offset,
        packet_info *pinfo, proto_tree *tree, proto_item *item, guint16 u16FrameID,
        const char *name, const char *name_short)
{
    proto_item *header_item;
    proto_tree *header_tree;
    guint16     seq_id;


    /* dissect the header */
    header_item = proto_tree_add_item(tree, hf_pn_ptcp_header, tvb, offset, 20 /* len */, ENC_NA);
    header_tree = proto_item_add_subtree(header_item, ett_pn_ptcp_header);

    /* Padding 12 bytes */
    offset = dissect_pn_padding(tvb, offset, pinfo, header_tree, 12);

    /* SequenceID */
    offset = dissect_pn_uint16(tvb, offset, pinfo, header_tree, hf_pn_ptcp_seq_id, &seq_id);

    /* Padding 6 bytes */
    offset = dissect_pn_padding(tvb, offset, pinfo, header_tree, 6);

    col_append_fstr(pinfo->cinfo, COL_INFO, "%s, Seq=%3u", name, seq_id);
    proto_item_append_text(item, "%s: Sequence=%u", name_short, seq_id);
    proto_item_append_text(header_item, ": Sequence=%u", seq_id);


    /* dissect the PDU */
    offset = dissect_PNPTCP_blocks(tvb, offset, pinfo, tree, item, u16FrameID);

    return offset;
}


static int
dissect_PNPTCP_DelayPDU(tvbuff_t *tvb, int offset,
        packet_info *pinfo, proto_tree *tree, proto_item *item, guint16 u16FrameID,
        const char *name, const char *name_short)
{
    proto_item *header_item;
    proto_tree *header_tree;
    guint16     seq_id;
    guint32     delay1ns;


    /* dissect the header */
    header_item = proto_tree_add_item(tree, hf_pn_ptcp_header, tvb, offset, 20 /* len */, ENC_NA);
    header_tree = proto_item_add_subtree(header_item, ett_pn_ptcp_header);

    /* Padding 12 bytes */
    offset = dissect_pn_padding(tvb, offset, pinfo, header_tree, 12);

    /* SequenceID */
    offset = dissect_pn_uint16(tvb, offset, pinfo, header_tree, hf_pn_ptcp_seq_id, &seq_id);

    /* Padding */
    offset = dissect_pn_align4(tvb, offset, pinfo, header_tree);

    /* Delay1ns_FUP */
    offset = dissect_pn_uint32(tvb, offset, pinfo, header_tree, hf_pn_ptcp_delay1ns, &delay1ns);

    col_append_fstr(pinfo->cinfo, COL_INFO, "%s, Seq=%3u, Delay=%11uns", name, seq_id, delay1ns);
    proto_item_append_text(item, "%s: Sequence=%u, Delay=%uns", name_short, seq_id, delay1ns);
    proto_item_append_text(header_item, ": Sequence=%u, Delay=%uns", seq_id, delay1ns);


    /* dissect the PDU */
    offset = dissect_PNPTCP_blocks(tvb, offset, pinfo, tree, item, u16FrameID);

    return offset;
}


/* possibly dissect a PN-RT packet (frame ID must be in the appropriate range) */
static gboolean
dissect_PNPTCP_Data_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
    guint16     u16FrameID;
    proto_item *item;
    proto_tree *ptcp_tree;
    int         offset = 0;
    guint32     u32SubStart;


    /* the tvb will NOT contain the frame_id here, so get it from our private data! */
    u16FrameID = GPOINTER_TO_UINT(pinfo->private_data);

    /* frame id must be in valid range (acyclic Real-Time, PTCP) */
    /* 0x0000 - 0x007F: RTSyncPDU (with follow up) */
    /* 0x0080 - 0x00FF: RTSyncPDU (without follow up) */
    /* 0xFF00 - 0xFF1F: AnnouncePDU */
    /* 0xFF20 - 0xFF3F: FollowUpPDU */
    /* 0xFF40 - 0xFF5F: Delay...PDU */
    if ( ((u16FrameID >= 0x0100) && (u16FrameID < 0xFF00)) || (u16FrameID > 0xFF5F) ) {
        /* we are not interested in this packet */
        return FALSE;
    }

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "PN-PTCP");
    col_clear(pinfo->cinfo, COL_INFO);

    /* subtree for PTCP */
    item        = proto_tree_add_protocol_format(tree, proto_pn_ptcp, tvb, 0, 0, "PROFINET PTCP, ");
    ptcp_tree   = proto_item_add_subtree(item, ett_pn_ptcp);
    u32SubStart = offset;

    switch (u16FrameID) {
    /* range 1 (0x0000 - 0x007F) */
        /* 0x0000 - 0x001F reserved */
    case 0x0020:
        offset = dissect_PNPTCP_RTSyncPDU(tvb, offset, pinfo, ptcp_tree, item, u16FrameID,
                                         "RTSync FU (Clock)", "RTSync FU (Clock)");
        break;
    case 0x0021:
        offset = dissect_PNPTCP_RTSyncPDU(tvb, offset, pinfo, ptcp_tree, item, u16FrameID,
                                         "RTSync FU  (Time)", "RTSync FU (Time)");
        break;
        /* 0x0022 - 0x007F reserved */

    /* range 2 (0x0080 - 0x00FF) */
    case 0x0080:
        offset = dissect_PNPTCP_RTSyncPDU(tvb, offset, pinfo, ptcp_tree, item, u16FrameID,
                                         "RTSync    (Clock)", "RTSync (Clock)");
        break;
    case 0x0081:
        offset = dissect_PNPTCP_RTSyncPDU(tvb, offset, pinfo, ptcp_tree, item, u16FrameID,
                                         "RTSync     (Time)", "RTSync (Time)");
        break;
        /* 0x0081 - 0x00FF reserved */

    /* range 7 (0xFF00 - 0xFF5F) */
    case 0xff00:
        offset = dissect_PNPTCP_AnnouncePDU(tvb, offset, pinfo, ptcp_tree, item, u16FrameID,
                                         "Announce  (Clock)", "Announce (Clock)");
        break;
    case 0xff01:
        offset = dissect_PNPTCP_AnnouncePDU(tvb, offset, pinfo, ptcp_tree, item, u16FrameID,
                                         "Announce   (Time)", "Announce (Time)");
        break;
        /* 0xFF02 - 0xFF1F reserved */
    case 0xff20:
        offset = dissect_PNPTCP_FollowUpPDU(tvb, offset, pinfo, ptcp_tree, item, u16FrameID,
                                         "FollowUp  (Clock)", "FollowUp (Clock)");
        break;
    case 0xff21:
        offset = dissect_PNPTCP_FollowUpPDU(tvb, offset, pinfo, ptcp_tree, item, u16FrameID,
                                         "FollowUp   (Time)", "FollowUp (Time)");
        break;
        /* 0xFF22 - 0xFF3F reserved */
    case 0xff40:
        offset = dissect_PNPTCP_DelayPDU(tvb, offset, pinfo, ptcp_tree, item, u16FrameID,
                                         "DelayReq         ", "DelayReq");
        break;
    case 0xff41:
        offset = dissect_PNPTCP_DelayPDU(tvb, offset, pinfo, ptcp_tree, item, u16FrameID,
                                         "DelayRes         ", "DelayRes");
        break;
    case 0xff42:
        offset = dissect_PNPTCP_DelayPDU(tvb, offset, pinfo, ptcp_tree, item, u16FrameID,
                                         "DelayFuRes       ", "DelayFuRes");
        break;
    case 0xff43:
        offset = dissect_PNPTCP_DelayPDU(tvb, offset, pinfo, ptcp_tree, item, u16FrameID,
                                         "DelayRes         ", "DelayRes");
        break;
    /* 0xFF44 - 0xFF5F reserved */
    default:
        offset = dissect_pn_undecoded(tvb, offset, pinfo, tree, tvb_length_remaining(tvb, offset));

        col_append_fstr(pinfo->cinfo, COL_INFO, "Reserved FrameID 0x%04x", u16FrameID);

        proto_item_append_text(item, "Reserved FrameID 0x%04x", u16FrameID);

        offset += tvb_length_remaining(tvb, offset);
        break;
    }

    proto_item_set_len(item, offset - u32SubStart);

    return TRUE;
}


void
proto_register_pn_ptcp (void)
{
    static hf_register_info hf[] = {
        { &hf_pn_ptcp_header,
          { "Header", "pn_ptcp.header",
            FT_NONE, BASE_NONE, NULL, 0x0,
            NULL, HFILL }},

        { &hf_pn_ptcp_block,
          { "Block", "pn_ptcp.block",
            FT_NONE, BASE_NONE, NULL, 0x0,
            NULL, HFILL }},

        { &hf_pn_ptcp_block_tlvheader,
          { "TLVHeader", "pn_ptcp.tlvheader",
            FT_NONE, BASE_NONE, NULL, 0x0,
            NULL, HFILL }},


        { &hf_pn_ptcp_res1,
          { "Reserved 1", "pn_ptcp.res1",
            FT_UINT32, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},

        { &hf_pn_ptcp_res2,
          { "Reserved 2", "pn_ptcp.res2",
            FT_UINT32, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},

        { &hf_pn_ptcp_delay10ns,
          { "Delay10ns", "pn_ptcp.delay10ns",
            FT_UINT32, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},

        { &hf_pn_ptcp_seq_id,
          { "SequenceID", "pn_ptcp.sequence_id",
            FT_UINT16, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},

        { &hf_pn_ptcp_delay1ns_byte,
          { "Delay1ns_Byte", "pn_ptcp.delay1ns_byte",
            FT_UINT8, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},

        { &hf_pn_ptcp_delay1ns,
          { "Delay1ns", "pn_ptcp.delay1ns",
            FT_UINT32, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},

        { &hf_pn_ptcp_delay1ns_fup,
          { "Delay1ns_FUP", "pn_ptcp.delay1ns_fup",
            FT_INT32, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},


        { &hf_pn_ptcp_tl_length,
          { "TypeLength.Length", "pn_ptcp.tl_length",
            FT_UINT16, BASE_DEC, 0x0, 0x1FF,
            NULL, HFILL }},

        { &hf_pn_ptcp_tl_type,
          { "TypeLength.Type", "pn_ptcp.tl_type",
            FT_UINT16, BASE_DEC, 0x0, 0xFE00,
            NULL, HFILL }},


        { &hf_pn_ptcp_master_source_address,
          { "MasterSourceAddress", "pn_ptcp.master_source_address",
            FT_ETHER, BASE_NONE, 0x0, 0x0,
            NULL, HFILL }},

        { &hf_pn_ptcp_subdomain_uuid,
          { "SubdomainUUID", "pn_ptcp.subdomain_uuid",
            FT_GUID, BASE_NONE, 0x0, 0x0,
            NULL, HFILL }},


        { &hf_pn_ptcp_port_mac_address,
          { "PortMACAddress", "pn_ptcp.port_mac_address",
            FT_ETHER, BASE_NONE, 0x0, 0x0,
            NULL, HFILL }},


        { &hf_pn_ptcp_t2portrxdelay,
          { "T2PortRxDelay (ns)", "pn_ptcp.t2portrxdelay",
            FT_UINT32, BASE_DEC, 0x0, 0x0,
            NULL, HFILL }},

        { &hf_pn_ptcp_t3porttxdelay,
          { "T3PortTxDelay (ns)", "pn_ptcp.t3porttxdelay",
            FT_UINT32, BASE_DEC, 0x0, 0x0,
            NULL, HFILL }},

        { &hf_pn_ptcp_t2timestamp,
          { "T2TimeStamp (ns)", "pn_ptcp.t2timestamp",
            FT_UINT32, BASE_DEC, 0x0, 0x0,
            NULL, HFILL }},


        { &hf_pn_ptcp_epoch_number,
          { "EpochNumber", "pn_ptcp.epoch_number",
            FT_UINT16, BASE_DEC, 0x0, 0x0,
            NULL, HFILL }},

        { &hf_pn_ptcp_seconds,
          { "Seconds", "pn_ptcp.seconds",
            FT_UINT32, BASE_DEC, 0x0, 0x0,
            NULL, HFILL }},

        { &hf_pn_ptcp_nanoseconds,
          { "NanoSeconds", "pn_ptcp.nanoseconds",
            FT_UINT32, BASE_DEC, 0x0, 0x0,
            NULL, HFILL }},


        { &hf_pn_ptcp_flags,
          { "Flags", "pn_ptcp.flags",
            FT_UINT16, BASE_HEX, 0x0, 0x0,
            NULL, HFILL }},

        { &hf_pn_ptcp_currentutcoffset,
          { "CurrentUTCOffset", "pn_ptcp.currentutcoffset",
            FT_UINT16, BASE_DEC, 0x0, 0x0,
            NULL, HFILL }},


        { &hf_pn_ptcp_master_priority1,
          { "MasterPriority1.Priority", "pn_ptcp.master_priority1_prio",
            FT_UINT8, BASE_HEX, VALS(pn_ptcp_master_prio1_vals), 0x07,
            NULL, HFILL }},

        { &hf_pn_ptcp_master_priority_level,
          { "MasterPriority1.Level", "pn_ptcp.master_priority1_level",
            FT_UINT8, BASE_HEX, VALS(pn_ptcp_master_prio1_levels), 0x38,
            NULL, HFILL }},

        { &hf_pn_ptcp_master_priority1_res,
          { "MasterPriority1.Reserved", "pn_ptcp.master_priority1_res",
            FT_UINT8, BASE_HEX, 0x0, 0x40,
            NULL, HFILL }},

        { &hf_pn_ptcp_master_priority1_act,
          { "MasterPriority1.Active", "pn_ptcp.master_priority1_act",
            FT_UINT8, BASE_HEX, VALS(pn_ptcp_master_prio1_vals_active), 0x80,
            NULL, HFILL }},

        { &hf_pn_ptcp_master_priority2,
          { "MasterPriority2", "pn_ptcp.master_priority2",
            FT_UINT8, BASE_DEC, VALS(pn_ptcp_master_prio2_vals), 0x0,
            NULL, HFILL }},

        { &hf_pn_ptcp_clock_class,
          { "ClockClass", "pn_ptcp.clock_class",
            FT_UINT8, BASE_DEC, VALS(pn_ptcp_clock_class_vals), 0x0,
            NULL, HFILL }},

        { &hf_pn_ptcp_clock_accuracy,
          { "ClockAccuracy", "pn_ptcp.clock_accuracy",
            FT_UINT8, BASE_DEC, VALS(pn_ptcp_clock_accuracy_vals), 0x0,
            NULL, HFILL }},

        { &hf_pn_ptcp_clockvariance,
          { "ClockVariance", "pn_ptcp.clockvariance",
            FT_INT16, BASE_DEC, 0x0, 0x0,
            NULL, HFILL }},


        { &hf_pn_ptcp_oui,
          { "Organizationally Unique Identifier", "pn_ptcp.oui",
            FT_UINT24, BASE_HEX, VALS(pn_ptcp_oui_vals), 0x0,
            NULL, HFILL }},

        { &hf_pn_ptcp_profinet_subtype,
          { "Subtype", "pn_ptcp.subtype",
            FT_UINT8, BASE_HEX, VALS(pn_ptcp_profinet_subtype_vals), 0x0,
            "PROFINET Subtype", HFILL }},


        { &hf_pn_ptcp_irdata_uuid,
          { "IRDataUUID", "pn_ptcp.irdata_uuid",
            FT_GUID, BASE_NONE, 0x0, 0x0,
            NULL, HFILL }},

    };

    static gint *ett[] = {
        &ett_pn_ptcp,
        &ett_pn_ptcp_header,
        &ett_pn_ptcp_block,
        &ett_pn_ptcp_block_header
    };
    proto_pn_ptcp = proto_register_protocol ("PROFINET PTCP", "PN-PTCP", "pn_ptcp");
    proto_register_field_array (proto_pn_ptcp, hf, array_length (hf));
    proto_register_subtree_array (ett, array_length (ett));
}

void
proto_reg_handoff_pn_ptcp (void)
{
    /* register ourself as an heuristic pn-rt payload dissector */
    heur_dissector_add("pn_rt", dissect_PNPTCP_Data_heur, proto_pn_ptcp);
}