path: root/plugins/epan/profinet/packet-pn-mrp.c

/* packet-pn-mrp.c
 * Routines for PN-MRP (PROFINET Media Redundancy Protocol)
 * packet dissection.
 *
 * 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/oui.h>
#include <epan/etypes.h>
#include <epan/dissectors/packet-dcerpc.h>

#include "packet-pn.h"

void proto_register_pn_mrp(void);
void proto_reg_handoff_pn_mrp(void);

static dissector_handle_t mrp_handle;

static int proto_pn_mrp = -1;

static int hf_pn_mrp_type = -1;
static int hf_pn_mrp_length = -1;
static int hf_pn_mrp_version = -1;
static int hf_pn_mrp_sequence_id = -1;
static int hf_pn_mrp_sa = -1;
static int hf_pn_mrp_prio = -1;
static int hf_pn_mrp_port_role = -1;
static int hf_pn_mrp_ring_state = -1;
static int hf_pn_mrp_interval = -1;
static int hf_pn_mrp_transition = -1;
static int hf_pn_mrp_time_stamp = -1;
static int hf_pn_mrp_blocked = -1;
static int hf_pn_mrp_domain_uuid = -1;
static int hf_pn_mrp_oui = -1;
static int hf_pn_mrp_ed1type = -1;
static int hf_pn_mrp_ed1_manufacturer_data = -1;
static int hf_pn_mrp_sub_tlv_header_type = -1;
static int hf_pn_mrp_sub_tlv_header_length = -1;
static int hf_pn_mrp_sub_option2 = -1;
static int hf_pn_mrp_other_mrm_prio = -1;
static int hf_pn_mrp_other_mrm_sa = -1;
static int hf_pn_mrp_manufacturer_data = -1;

static gint ett_pn_mrp = -1;
static gint ett_pn_mrp_type = -1;
static gint ett_pn_sub_tlv = -1;

static const value_string pn_mrp_block_type_vals[] = {
    { 0x00, "MRP_End" },
    { 0x01, "MRP_Common" },
    { 0x02, "MRP_Test" },
    { 0x03, "MRP_TopologyChange" },
    { 0x04, "MRP_LinkDown" },
    { 0x05, "MRP_LinkUp" },
    { 0x06, "MRP_InTest" },
    { 0x07, "MRP_InTopologyChange" },
    { 0x08, "MRP_InLinkDown" },
    { 0x09, "MRP_InLinkUp" },
    { 0x0A, "MRP_InLinkStatusPoll" },
    /*0x0B - 0x7E Reserved */
    { 0x7F, "MRP_Option (Organizationally Specific)"},
    { 0, NULL },
};

static const value_string pn_mrp_oui_vals[] = {
    { OUI_PROFINET,         "PROFINET" },
    { OUI_SIEMENS,          "SIEMENS" },

    { 0, NULL }
};



static const value_string pn_mrp_port_role_vals[] = {
    { 0x0000, "Primary ring port" },
    { 0x0001, "Secondary ring port"},
    /*0x0002 - 0xFFFF Reserved */

    { 0, NULL }
};

#if 0
static const value_string pn_mrp_role_vals[] = {
    { 0x0000, "Media redundancy disabled" },
    { 0x0001, "Media redundancy client" },
    { 0x0002, "Media redundancy manager" },
    { 0x0003, "Media redundancy manager (auto)" },
    /*0x0004 - 0xFFFF Reserved */

    { 0, NULL }
};
#endif

static const value_string pn_mrp_ring_state_vals[] = {
    { 0x0000, "Ring open" },
    { 0x0001, "Ring closed"},
    /*0x0002 - 0xFFFF Reserved */

    { 0, NULL }
};


#if 0
static const value_string pn_mrp_prio_vals[] = {
    { 0x8000, "Default priority for redundancy manager" },

    { 0, NULL }
};
#endif

static const value_string pn_mrp_sub_tlv_header_type_vals[] = {
    /* 0x00 Reserved */
    { 0x01, "MRP_TestMgrNAck" },
    { 0x02, "MRP_TestPropagate" },
    { 0x03, "MRP_AutoMgr" },
    /* 0x04 - 0xF0 Reserved for IEC specific functions */
    { 0xF1, "Manufacturer specific functions" },
    { 0xF2, "Manufacturer specific functions" },
    { 0xF3, "Manufacturer specific functions" },
    { 0xF4, "Manufacturer specific functions" },
    { 0xF5, "Manufacturer specific functions" },
    { 0xF6, "Manufacturer specific functions" },
    { 0xF7, "Manufacturer specific functions" },
    { 0xF8, "Manufacturer specific functions" },
    { 0xF9, "Manufacturer specific functions" },
    { 0xFA, "Manufacturer specific functions" },
    { 0xFB, "Manufacturer specific functions" },
    { 0xFC, "Manufacturer specific functions" },
    { 0xFD, "Manufacturer specific functions" },
    { 0xFE, "Manufacturer specific functions" },
    { 0xFF, "Manufacturer specific functions" },
    { 0, NULL },
};

static int
dissect_PNMRP_Common(tvbuff_t *tvb, int offset,
    packet_info *pinfo, proto_tree *tree, proto_item *item _U_)
{
    guint16  sequence_id;
    e_guid_t uuid;


    /* MRP_SequenceID */
    offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_mrp_sequence_id, &sequence_id);

    /* MRP_DomainUUID */
    offset = dissect_pn_uuid(tvb, offset, pinfo, tree, hf_pn_mrp_domain_uuid, &uuid);

    return offset;
}


static int
dissect_PNMRP_Link(tvbuff_t *tvb, int offset,
    packet_info *pinfo, proto_tree *tree, proto_item *item _U_)
{
    guint8      mac[6];
    guint16     port_role;
    guint16     interval;
    guint16     blocked;
    proto_item *sub_item;

    /* MRP_SA */
    offset = dissect_pn_mac(tvb, offset, pinfo, tree, hf_pn_mrp_sa, mac);

    /* MRP_PortRole */
    offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_mrp_port_role, &port_role);

    /* MRP_Interval */
    offset = dissect_pn_uint16_ret_item(tvb, offset, pinfo, tree, hf_pn_mrp_interval, &interval, &sub_item);
    if (tree)
    {
        proto_item_append_text(sub_item," Interval for next topology change event (in ms)");
        if (interval <0x07D1)
            proto_item_append_text(sub_item," Mandatory");
        else
            proto_item_append_text(sub_item," Optional");
    }

    /* MRP_Blocked */
    offset = dissect_pn_uint16_ret_item(tvb, offset, pinfo, tree, hf_pn_mrp_blocked, &blocked, &sub_item);
    if (tree)
    {
        if (blocked == 0)
            proto_item_append_text(sub_item," The MRC is not able to receive and forward frames to port in state blocked");
        else
            if (blocked == 1)
                proto_item_append_text(sub_item," The MRC is able to receive and forward frames to port in state blocked");
            else
                proto_item_append_text(sub_item," Reserved");
    }

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

static const char * mrp_Prio2msg(guint16 prio)
{

    if (prio == 0x0000)
        return(" Highest priority redundancy manager");
    if ((prio >= 0x1000) && (prio <= 0x7000))
        return(" High priorities");
    if (prio == 0x8000)
        return(" Default priority for redundancy manager");
    if ((prio >= 0x8001) && (prio <= 0x8FFF))
        return(" Low priorities for redundancy manager");
    if ((prio >= 0x9000) && (prio <= 0x9FFF))
        return(" High priorities for redundancy manager (auto)");
    if (prio == 0xA000)
        return(" Default priority for redundancy manager (auto)");
    if ((prio >= 0xA001) && (prio <= 0xF000))
        return(" Low priorities for redundancy manager (auto)");
    if (prio ==0xFFFF)
        return(" Lowest priority for redundancy manager (auto)");

    return(" Reserved");
}

static int
dissect_PNMRP_Test(tvbuff_t *tvb, int offset,
    packet_info *pinfo, proto_tree *tree, proto_item *item _U_)
{
    guint16     prio;
    guint8      mac[6];
    guint16     port_role;
    guint16     ring_state;
    guint16     transition;
    guint32     time_stamp;
    proto_item *sub_item;


    /* MRP_Prio */
    offset = dissect_pn_uint16_ret_item(tvb, offset, pinfo, tree, hf_pn_mrp_prio, &prio, &sub_item);
    if (tree)
        proto_item_append_text(sub_item, "%s", mrp_Prio2msg(prio));

    /* MRP_SA */
    offset = dissect_pn_mac(tvb, offset, pinfo, tree, hf_pn_mrp_sa, mac);

    /* MRP_PortRole */
    offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_mrp_port_role, &port_role);

    /* MRP_RingState */
    offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_mrp_ring_state, &ring_state);

    /* MRP_Transition */
    offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_mrp_transition, &transition);

    /* MRP_TimeStamp */
    proto_tree_add_item_ret_uint(tree, hf_pn_mrp_time_stamp, tvb, offset, 4, ENC_BIG_ENDIAN, &time_stamp);
    offset += 4;

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

    return offset;
}


static int
dissect_PNMRP_TopologyChange(tvbuff_t *tvb, int offset,
    packet_info *pinfo, proto_tree *tree, proto_item *item _U_)
{
    guint16     prio;
    guint8      mac[6];
    guint16     interval;
    proto_item *sub_item;


    /* MRP_Prio */
    offset = dissect_pn_uint16_ret_item(tvb, offset, pinfo, tree, hf_pn_mrp_prio, &prio, &sub_item);
    if (tree)
        proto_item_append_text(sub_item, "%s", mrp_Prio2msg(prio));

    /* MRP_SA */
    offset = dissect_pn_mac(tvb, offset, pinfo, tree, hf_pn_mrp_sa, mac);

    /* MRP_Interval */
    offset = dissect_pn_uint16_ret_item(tvb, offset, pinfo, tree, hf_pn_mrp_interval, &interval, &sub_item);
    if (tree)
    {
        proto_item_append_text(sub_item," Interval for next topology change event (in ms) ");
        if (interval <0x07D1)
            proto_item_append_text(sub_item,"Mandatory");
        else
            proto_item_append_text(sub_item,"Optional");
    }
    /* Padding */
    /*offset = dissect_pn_align4(tvb, offset, pinfo, tree);*/

    return offset;
}

static int
dissect_PNMRP_Ed1ManufacturerData(tvbuff_t *tvb, int offset,
packet_info *pinfo, proto_tree *tree, guint8 *pLength)
{
    guint16 u16MrpEd1ManufacturerData;
    offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_mrp_ed1_manufacturer_data,
        &u16MrpEd1ManufacturerData);
    *pLength -= 2;
    return offset;
}

static int
dissect_PNMRP_SubOption2(tvbuff_t *tvb, int offset,
packet_info *pinfo, proto_tree *tree)
{
    guint8    u8SubType;
    guint8    u8Sublength;
    proto_item *sub_item;
    proto_tree *sub_tree;
    guint16     u16Prio;
    guint16     u16OtherPrio;
    guint8      mac[6];
    guint8      otherMac[6];

    sub_item = proto_tree_add_item(tree, hf_pn_mrp_sub_option2, tvb, offset, 0, ENC_NA);
    sub_tree = proto_item_add_subtree(sub_item, ett_pn_sub_tlv);

    /*
        MRP_SubTLVHeader (Type=0x01 or Type=0x02, Length = 0x12),
            MRP_Prio,
            MRP_SA,
            MRP_OtherMRMPrio,
            MRP_OtherMRMSA,
            Padding (=0x00,0x00)
    */
    /* MRP_SubTLVHeader.Type */
    offset = dissect_pn_uint8(tvb, offset, pinfo, sub_tree, hf_pn_mrp_sub_tlv_header_type, &u8SubType);

    /* MRP_SubTLVHeader.Length */
    offset = dissect_pn_uint8(tvb, offset, pinfo, sub_tree, hf_pn_mrp_sub_tlv_header_length, &u8Sublength);

    if (u8SubType == 0x00)
    {
        // IEC area: 0x00: Reserved;
        return offset;
    }
    else if ( u8SubType == 0x01 || u8SubType == 0x02 )
    {
        // IEC area: 0x01: MRP_TestMgrNAck;
        // IEC area: 0x02: MRP_AutoMgr;

        /* MRP_Prio */
        offset = dissect_pn_uint16_ret_item(tvb, offset, pinfo, sub_tree, hf_pn_mrp_prio, &u16Prio, &sub_item);
        proto_item_append_text(sub_item, "%s", mrp_Prio2msg(u16Prio));

        /* MRP_SA */
        offset = dissect_pn_mac(tvb, offset, pinfo, sub_tree, hf_pn_mrp_sa, mac);

        /* MRP_OtherMRMPrio */
        offset = dissect_pn_uint16_ret_item(tvb, offset, pinfo, sub_tree, hf_pn_mrp_other_mrm_prio,
            &u16OtherPrio, &sub_item);
        proto_item_append_text(sub_item, "%s", mrp_Prio2msg(u16OtherPrio));

        /* MRP_OtherMRMSA */
        offset = dissect_pn_mac(tvb, offset, pinfo, sub_tree, hf_pn_mrp_other_mrm_sa, otherMac);

        offset = dissect_pn_align4(tvb, offset, pinfo, sub_tree);
    }
    else if ( 0xF1 <= u8SubType )
    {
        proto_tree_add_string_format(sub_tree, hf_pn_mrp_manufacturer_data, tvb, offset, u8Sublength, "data",
        "Reserved for vendor specific data: %u byte", u8Sublength);
        offset += u8Sublength;
    }
    return offset;
}

static int
dissect_PNMRP_Option(tvbuff_t *tvb, int offset,
    packet_info *pinfo, proto_tree *tree, proto_item *item, guint8 length)
{
    guint32 oui;
    guint8 u8MrpEd1Type;

    /* OUI (organizational unique id) */
    offset = dissect_pn_oid(tvb, offset, pinfo,tree, hf_pn_mrp_oui, &oui);

    switch (oui)
    {
    case OUI_SIEMENS:
        proto_item_append_text(item, "(SIEMENS)");
        length -= 3;
        offset = dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_mrp_ed1type, &u8MrpEd1Type);
        length -= 1;
        switch (u8MrpEd1Type)
        {
        case 0x00:
            offset = dissect_PNMRP_Ed1ManufacturerData(tvb, offset, pinfo, tree, &length);
            break;
        case 0x01:
        case 0x02:
        case 0x03:
            break;
        case 0x04:
            offset = dissect_PNMRP_Ed1ManufacturerData(tvb, offset, pinfo, tree, &length);
            break;
        /* 0x05 to 0xFF*/
        default:
            break;
        }
        //offset = dissect_PNMRP_Ed1ManufacturerData(tvb, offset, pinfo, tree, &length);

        if (length != 0)
        {
            offset = dissect_PNMRP_SubOption2(tvb, offset, pinfo, tree);
        }
        col_append_str(pinfo->cinfo, COL_INFO, "(Siemens)");
        break;
    default:
        proto_item_append_text(item, " (Unknown-OUI)");
        offset = dissect_pn_undecoded(tvb, offset, pinfo, tree, length);

    }

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

    return offset;
}


static int
dissect_PNMRP_PDU(tvbuff_t *tvb, int offset,
    packet_info *pinfo, proto_tree *tree, proto_item *item)
{
    guint16   version;
    guint8    type;
    guint8    length;
    gint      i;
    tvbuff_t *new_tvb;
    proto_item *sub_item;
    proto_tree *sub_tree;

    /* MRP_Version */
    offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_mrp_version, &version);

    /* the rest of the packet has 4byte alignment regarding to the beginning of the next TLV block! */
    /* XXX - do we have to free this new tvb below? */
    new_tvb = tvb_new_subset_remaining(tvb, offset);
    offset = 0;

    for(i=0; tvb_reported_length_remaining(tvb, offset) > 0; i++) {

        sub_item = proto_tree_add_item(tree, hf_pn_mrp_type, new_tvb, offset, 1, ENC_BIG_ENDIAN);
        sub_tree = proto_item_add_subtree(sub_item, ett_pn_mrp_type);

        /* MRP_TLVHeader.Type */
        offset = dissect_pn_uint8(new_tvb, offset, pinfo, sub_tree, hf_pn_mrp_type, &type);

        /* MRP_TLVHeader.Length */
        offset = dissect_pn_uint8(new_tvb, offset, pinfo, sub_tree, hf_pn_mrp_length, &length);

        if (i != 0) {
            col_append_str(pinfo->cinfo, COL_INFO, ", ");

            proto_item_append_text(item, ", ");
        } else {
            proto_item_append_text(item, " ");
        }
        col_append_str(pinfo->cinfo, COL_INFO, val_to_str(type, pn_mrp_block_type_vals, "Unknown TLVType 0x%x"));
        proto_item_append_text(item, "%s", val_to_str(type, pn_mrp_block_type_vals, "Unknown TLVType 0x%x"));

        switch(type) {
        case 0x00:
            /* no content */
            return offset;
            break;
        case 0x01:
            offset = dissect_PNMRP_Common(new_tvb, offset, pinfo, sub_tree, sub_item);
            break;
        case 0x02:
            offset = dissect_PNMRP_Test(new_tvb, offset, pinfo, sub_tree, sub_item);
            break;
        case 0x03:
            offset = dissect_PNMRP_TopologyChange(new_tvb, offset, pinfo, sub_tree, sub_item);
            break;
        case 0x04:
        case 0x05: /* dissection of up and down is identical! */
            offset = dissect_PNMRP_Link(new_tvb, offset, pinfo, sub_tree, sub_item);
            break;
        case 0x7f:
            offset = dissect_PNMRP_Option(new_tvb, offset, pinfo, sub_tree, sub_item, length);
            break;
        default:
            offset = dissect_pn_undecoded(tvb, offset, pinfo, sub_tree, length);

        }
    }

    return offset;
}


/* Dissect MRP packets */
static int
dissect_PNMRP(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
    proto_item *ti       = NULL;
    proto_tree *mrp_tree = NULL;

    guint32 offset = 0;

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "PN-MRP");

    /* Clear the information column on summary display */
    col_clear(pinfo->cinfo, COL_INFO);

    if (tree)
    {
        ti = proto_tree_add_item(tree, proto_pn_mrp, tvb, offset, -1, ENC_NA);
        mrp_tree = proto_item_add_subtree(ti, ett_pn_mrp);
    }

    dissect_PNMRP_PDU(tvb, offset, pinfo, mrp_tree, ti);
    return tvb_captured_length(tvb);
}


void
proto_register_pn_mrp (void)
{
    static hf_register_info hf[] = {
    { &hf_pn_mrp_type,
      { "MRP_TLVHeader.Type", "pn_mrp.type",
        FT_UINT8, BASE_HEX, VALS(pn_mrp_block_type_vals), 0x0,
        NULL, HFILL }},

    { &hf_pn_mrp_length,
      { "MRP_TLVHeader.Length", "pn_mrp.length",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }},

    { &hf_pn_mrp_version,
      { "MRP_Version", "pn_mrp.version",
        FT_UINT16, BASE_DEC, NULL, 0x0,
        NULL, HFILL }},

    { &hf_pn_mrp_sequence_id,
      { "MRP_SequenceID", "pn_mrp.sequence_id",
        FT_UINT16, BASE_HEX, NULL, 0x0,
        "Unique sequence number to each outstanding service request", HFILL }},

    { &hf_pn_mrp_sa,
      { "MRP_SA", "pn_mrp.sa",
        FT_ETHER, BASE_NONE, 0x0, 0x0,
        NULL, HFILL }},

    { &hf_pn_mrp_prio,
      { "MRP_Prio", "pn_mrp.prio",
        FT_UINT16, BASE_HEX, 0, 0x0,
        NULL, HFILL }},

    { &hf_pn_mrp_port_role,
      { "MRP_PortRole", "pn_mrp.port_role",
        FT_UINT16, BASE_HEX, VALS(pn_mrp_port_role_vals), 0x0,
        NULL, HFILL }},

    { &hf_pn_mrp_ring_state,
      { "MRP_RingState", "pn_mrp.ring_state",
        FT_UINT16, BASE_HEX, VALS(pn_mrp_ring_state_vals), 0x0,
        NULL, HFILL }},

    { &hf_pn_mrp_interval,
      { "MRP_Interval", "pn_mrp.interval",
        FT_UINT16, BASE_DEC, NULL, 0x0,
        "Interval for next topology change event (in ms)", HFILL }},

    { &hf_pn_mrp_transition,
      { "MRP_Transition", "pn_mrp.transition",
        FT_UINT16, BASE_HEX, NULL, 0x0,
        "Number of transitions between media redundancy lost and ok states", HFILL }},

    { &hf_pn_mrp_time_stamp,
      { "MRP_TimeStamp [ms]", "pn_mrp.time_stamp",
        FT_UINT32, BASE_HEX, NULL, 0x0,
        "Actual counter value of 1ms counter", HFILL }},

    { &hf_pn_mrp_blocked,
      { "MRP_Blocked", "pn_mrp.blocked",
        FT_UINT16, BASE_HEX, NULL, 0x0,
        NULL, HFILL }},

    { &hf_pn_mrp_domain_uuid,
      { "MRP_DomainUUID", "pn_mrp.domain_uuid",
        FT_GUID, BASE_NONE, NULL, 0x0,
        NULL, HFILL }},

    { &hf_pn_mrp_oui,
      { "MRP_ManufacturerOUI", "pn_mrp.oui",
        FT_UINT24, BASE_HEX, VALS(pn_mrp_oui_vals), 0x0,
        NULL, HFILL }},

    { &hf_pn_mrp_ed1type,
      { "MRP_Ed1Type", "pn_mrp.ed1type",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }},

    { &hf_pn_mrp_ed1_manufacturer_data,
      { "MRP_Ed1ManufacturerData", "pn_mrp.ed1manufacturerdata",
        FT_UINT16, BASE_HEX, NULL, 0x0,
        NULL, HFILL }},

    { &hf_pn_mrp_sub_option2,
      { "MRP_SubOption2", "pn_mrp.sub_option2",
        FT_NONE, BASE_NONE, NULL, 0x0,
        NULL, HFILL } },

    { &hf_pn_mrp_sub_tlv_header_type,
      { "MRP_SubTLVHeader.Type", "pn_mrp.sub_type",
        FT_UINT8, BASE_HEX, VALS(pn_mrp_sub_tlv_header_type_vals), 0x0,
        NULL, HFILL }},

    { &hf_pn_mrp_sub_tlv_header_length,
      { "MRP_SubTLVHeader.Length", "pn_mrp.sub_length",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }},

    { &hf_pn_mrp_other_mrm_prio,
      { "MRP_OtherMRMPrio", "pn_mrp.other_mrm_prio",
        FT_UINT16, BASE_HEX, 0, 0x0,
        NULL, HFILL }},

    { &hf_pn_mrp_other_mrm_sa,
      { "MRP_OtherMRMSA", "pn_mrp.other_mrm_sa",
        FT_ETHER, BASE_NONE, 0x0, 0x0,
        NULL, HFILL }},
    { &hf_pn_mrp_manufacturer_data,
      { "MRP_ManufacturerData", "pn_mrp.manufacturer_data",
        FT_STRING, BASE_NONE, NULL, 0x0,
        NULL, HFILL }}
    };

    static gint *ett[] = {
        &ett_pn_mrp,
        &ett_pn_mrp_type,
        &ett_pn_sub_tlv
    };

    proto_pn_mrp = proto_register_protocol ("PROFINET MRP", "PN-MRP", "pn_mrp");
    proto_register_field_array (proto_pn_mrp, hf, array_length (hf));
    proto_register_subtree_array (ett, array_length (ett));
    mrp_handle = register_dissector("pn_mrp", dissect_PNMRP, proto_pn_mrp);
}


void
proto_reg_handoff_pn_mrp (void)
{
    dissector_add_uint("ethertype", ETHERTYPE_MRP, mrp_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:
 */