/* packet-mrp_msrp.c

 * Routines for MSRP (MRP Multiple Stream Reservation Protocol) dissection

 * Copyright 2010, Torrey Atcitty <tatcitty@harman.com>

 *                 Craig Gunther <craig.gunther@harman.com>

 *

 * Based on the code from packet-mmrp.c (MMRP) from

 * Markus Seehofer <mseehofe@nt.hirschmann.de> Copyright 2001

 *

 * Wireshark - Network traffic analyzer

 * By Gerald Combs <gerald@wireshark.org>

 * Copyright 1998 Gerald Combs

 *

 * SPDX-License-Identifier: GPL-2.0-or-later

 *

 * The MSRP Protocol specification can be found at the following:

 * http://www.ieee802.org/1/files/private/at-drafts/d6/802-1at-d6-0.pdf

 *

 */

#include "config.h"

#include <epan/packet.h>

#include <epan/expert.h>

#include <epan/etypes.h>

void proto_register_mrp_msrp(void);

void proto_reg_handoff_mrp_msrp(void);

static dissector_handle_t msrp_handle;

/* MSRP End Mark Sequence */

#define MSRP_END_MARK       0x0000

/**********************************************************/

/* Offsets of fields within an MSRP packet                */

/**********************************************************/

#define MSRP_PROTOCOL_VERSION_OFFSET        0

/* Next comes the MSRP Message group */

#define MSRP_MESSAGE_GROUP_OFFSET          (MSRP_PROTOCOL_VERSION_OFFSET + 1) /* Message is a group of fields */

#define MSRP_ATTRIBUTE_TYPE_OFFSET         (MSRP_MESSAGE_GROUP_OFFSET)

#define MSRP_ATTRIBUTE_LENGTH_OFFSET       (MSRP_ATTRIBUTE_TYPE_OFFSET + 1)

#define MSRP_ATTRIBUTE_LIST_LENGTH_OFFSET  (MSRP_ATTRIBUTE_LENGTH_OFFSET + 1)

/* Next comes the MSRP AttributeList group */

#define MSRP_ATTRIBUTE_LIST_GROUP_OFFSET   (MSRP_ATTRIBUTE_LIST_LENGTH_OFFSET + 2) /* AttributeList is a group of fields */

/* Next comes the MSRP VectorAttribute group */

#define MSRP_VECTOR_ATTRIBUTE_GROUP_OFFSET (MSRP_ATTRIBUTE_LIST_GROUP_OFFSET) /* VectorAttribute is a group of fields */

#define MSRP_VECTOR_HEADER_OFFSET          (MSRP_VECTOR_ATTRIBUTE_GROUP_OFFSET) /* contains the following two fields */

#define MSRP_LEAVE_ALL_EVENT_OFFSET        (MSRP_VECTOR_HEADER_OFFSET)

#define MSRP_LEAVE_ALL_EVENT_MASK           0xE000

#define MSRP_NUMBER_OF_VALUES_OFFSET       (MSRP_VECTOR_HEADER_OFFSET)

#define MSRP_NUMBER_OF_VALUES_MASK          0x1fff

/* Next comes the MSRP FirstValue group */

#define MSRP_FIRST_VALUE_GROUP_OFFSET      (MSRP_VECTOR_HEADER_OFFSET + 2) /* FirstValue is a group of fields */

#define MSRP_STREAM_ID_OFFSET              (MSRP_FIRST_VALUE_GROUP_OFFSET)

#define MSRP_STREAM_DA_OFFSET              (MSRP_STREAM_ID_OFFSET + 8)

#define MSRP_VLAN_ID_OFFSET                (MSRP_STREAM_DA_OFFSET + 6)

#define MSRP_TSPEC_MAX_FRAME_SIZE_OFFSET       (MSRP_VLAN_ID_OFFSET + 2)

#define MSRP_TSPEC_MAX_INTERVAL_FRAMES_OFFSET  (MSRP_TSPEC_MAX_FRAME_SIZE_OFFSET + 2)

#define MSRP_PRIORITY_AND_RANK_OFFSET          (MSRP_TSPEC_MAX_INTERVAL_FRAMES_OFFSET + 2) /* contains the following two fields */

#define MSRP_PRIORITY_OFFSET               (MSRP_PRIORITY_AND_RANK_OFFSET)

#define MSRP_PRIORITY_MASK                  0xe0

#define MSRP_RANK_OFFSET                   (MSRP_PRIORITY_AND_RANK_OFFSET)

#define MSRP_RANK_MASK                      0x10

#define MSRP_RESERVED_OFFSET               (MSRP_PRIORITY_AND_RANK_OFFSET)

#define MSRP_RESERVED_MASK                  0x0F

#define MSRP_ACCUMULATED_LATENCY_OFFSET    (MSRP_PRIORITY_AND_RANK_OFFSET + 1)

#define MSRP_FAILURE_BRIDGE_ID_OFFSET      (MSRP_ACCUMULATED_LATENCY_OFFSET + 4)

#define MSRP_FAILURE_CODE_OFFSET           (MSRP_FAILURE_BRIDGE_ID_OFFSET + 8)

#define MSRP_DOMAIN_THREE_PACKED_OFFSET           (MSRP_FIRST_VALUE_GROUP_OFFSET + 4)

#define MSRP_LISTENER_THREE_PACKED_OFFSET         (MSRP_STREAM_ID_OFFSET + 8)

#define MSRP_TALKER_ADVERTISE_THREE_PACKED_OFFSET (MSRP_ACCUMULATED_LATENCY_OFFSET + 4)

#define MSRP_TALKER_FAILED_THREE_PACKED_OFFSET    (MSRP_FAILURE_CODE_OFFSET + 1)

/**********************************************************/

/* Valid field contents                                   */

/**********************************************************/

/* Attribute Type definitions */

#define MSRP_ATTRIBUTE_TYPE_TALKER_ADVERTISE    0x01

#define MSRP_ATTRIBUTE_TYPE_TALKER_FAILED       0x02

#define MSRP_ATTRIBUTE_TYPE_LISTENER            0x03

#define MSRP_ATTRIBUTE_TYPE_DOMAIN              0x04

static const value_string attribute_type_vals[] = {

    { MSRP_ATTRIBUTE_TYPE_TALKER_ADVERTISE, "Talker Advertise" },

    { MSRP_ATTRIBUTE_TYPE_TALKER_FAILED,    "Talker Failed" },

    { MSRP_ATTRIBUTE_TYPE_LISTENER,         "Listener" },

    { MSRP_ATTRIBUTE_TYPE_DOMAIN,           "Domain" },

    { 0,                                    NULL }

};

/* Leave All Event definitions */

#define MSRP_NULLLEAVEALL   0

#define MSRP_LEAVEALL       1

static const value_string leave_all_vals[] = {

    { MSRP_NULLLEAVEALL, "Null" },

    { MSRP_LEAVEALL,     "Leave All" },

    { 0,                 NULL }

};

/* Priority definitions */

 #define MSRP_TRAFFIC_CLASS_A    3

 #define MSRP_TRAFFIC_CLASS_B    2

static const value_string priority_vals[] = {

    { MSRP_TRAFFIC_CLASS_A, "Traffic Class A" },

    { MSRP_TRAFFIC_CLASS_B, "Traffic Class B" },

    { 0,                    NULL }

};

/* Rank definitions */

static const value_string rank_vals[] = {

    { 0, "Emergency" },

    { 1, "Non-emergency" },

    { 0, NULL }

};

static const value_string reserved_vals[] = {

    {  0, "Reserved-0" },

    {  1, "Reserved-1" },

    {  2, "Reserved-2" },

    {  3, "Reserved-3" },

    {  4, "Reserved-4" },

    {  5, "Reserved-5" },

    {  6, "Reserved-6" },

    {  7, "Reserved-7" },

    {  8, "Reserved-8" },

    {  9, "Reserved-9" },

    { 10, "Reserved-10" },

    { 11, "Reserved-11" },

    { 12, "Reserved-12" },

    { 13, "Reserved-13" },

    { 14, "Reserved-14" },

    { 15, "Reserved-15" },

    { 0,  NULL }

};

/* Failure Code definitions */

static const value_string failure_vals[] = {

    {  1, "Insufficient Bandwidth" },

    {  2, "Insufficient Bridge resources" },

    {  3, "Insufficient Bandwidth for Traffic Class" },

    {  4, "Stream ID in use by another Talker" },

    {  5, "Stream destination_address already in use" },

    {  6, "Stream preempted by higher rank" },

    {  7, "Reported latency has changed" },

    {  8, "Egress port in not AVB capable" },

    {  9, "Use a different destination address (i.e. MAC DA hash table full)" },

    { 10, "Out of MSRP resources" },

    { 11, "Out of MMRP resources" },

    { 12, "Cannot store destination_address (i.e. Bridge is out of MAC resources)" },

    { 13, "Requested priority not an SR Class (3.3) priority" },

    { 14, "MaxFrameSize (35.2.2.8.4(a)) is too large for media" },

    { 15, "msrpMaxFanInPorts (35.2.1.4(f)) limit has been reached" },

    { 16, "Changes in FirstValue for a registered StreamID" },

    { 17, "VLAN is blocked on this egress port (Registration Forbidden)" },

    { 18, "VLAN tagging is disabled on this egress port (untagged set)" },

    { 19, "SR class priority mismatch" },

    { 0, NULL }

};

/* SR class ID definitions */

 #define MSRP_SR_CLASS_A    6

 #define MSRP_SR_CLASS_B    5

 #define MSRP_SR_CLASS_C    4

 #define MSRP_SR_CLASS_D    3

 #define MSRP_SR_CLASS_E    2

 #define MSRP_SR_CLASS_F    1

 #define MSRP_SR_CLASS_G    0

static const value_string sr_class_vals[] = {

    { MSRP_SR_CLASS_A, "SR Class A" },

    { MSRP_SR_CLASS_B, "SR Class B" },

    { MSRP_SR_CLASS_C, "SR Class C" },

    { MSRP_SR_CLASS_D, "SR Class D" },

    { MSRP_SR_CLASS_E, "SR Class E" },

    { MSRP_SR_CLASS_F, "SR Class F" },

    { MSRP_SR_CLASS_G, "SR Class G" },

    { 0,                       NULL }

};

/* Three Packed Event definitions */

static const value_string three_packed_vals[] = {

    { 0, "New" },

    { 1, "JoinIn" },

    { 2, "In" },

    { 3, "JoinMt" },

    { 4, "Mt" },

    { 5, "Lv" },

    { 0, NULL }

};

/* Four Packed Event definitions */

static const value_string four_packed_vals[] = {

    { 0, "Ignore" },

    { 1, "Asking Failed" },

    { 2, "Ready" },

    { 3, "Ready Failed" },

    { 0, NULL }

};

/**********************************************************/

/* Initialize the protocol and registered fields          */

/**********************************************************/

static int proto_msrp;

static int hf_msrp_proto_id;

static int hf_msrp_message; /* Message is a group of fields */

static int hf_msrp_attribute_type;

static int hf_msrp_attribute_length;

static int hf_msrp_attribute_list_length;

static int hf_msrp_attribute_list; /* AttributeList is a group of fields */

static int hf_msrp_vector_attribute; /* VectorAttribute is a group of fields */

/* The following VectorHeader contains the LeaveAllEvent and NumberOfValues */

static int hf_msrp_vector_header;

static int hf_msrp_leave_all_event;

static int hf_msrp_number_of_values;

static int ett_vector_header;

static int * const vector_header_fields[] = {

    &hf_msrp_leave_all_event,

    &hf_msrp_number_of_values,

    NULL

};

static int hf_msrp_first_value; /* FirstValue is a group of fields */

static int hf_msrp_stream_id;

static int hf_msrp_stream_da;

static int hf_msrp_vlan_id;

static int hf_msrp_tspec_max_frame_size;

static int hf_msrp_tspec_max_interval_frames;

static int hf_msrp_priority_and_rank;

static int hf_msrp_priority;

static int hf_msrp_rank;

static int hf_msrp_reserved;

static int ett_priority_and_rank;

static int * const priority_and_rank_fields[] = {

    &hf_msrp_priority,

    &hf_msrp_rank,

    &hf_msrp_reserved,

    NULL

};

static int hf_msrp_sr_class_id;

static int hf_msrp_sr_class_priority;

static int hf_msrp_sr_class_vid;

static int hf_msrp_accumulated_latency;

static int hf_msrp_failure_bridge_id;

static int hf_msrp_failure_code;

static int hf_msrp_three_packed_event;

static int hf_msrp_four_packed_event;

static int hf_msrp_end_mark;

/* Initialize the subtree pointers */

static int ett_msrp;

static int ett_msg;

static int ett_attr_list;

static int ett_vect_attr;

static int ett_first_value;

static expert_field ei_msrp_attribute_type;

/**********************************************************/

/* Dissector starts here                                  */

/**********************************************************/

/* dissect_msrp_common1 (called from dissect_msrp)

 *

 * dissect the following fields which are common to all MSRP attributes:

 *   Attribute Type

 *   Attribute Length

 *   Attribute List Length

 */

static void

dissect_msrp_common1(proto_tree *msg_tree, tvbuff_t *tvb, int msg_offset)

{

    proto_tree_add_item(msg_tree, hf_msrp_attribute_type, tvb,

                        MSRP_ATTRIBUTE_TYPE_OFFSET + msg_offset, 1, ENC_BIG_ENDIAN);

    proto_tree_add_item(msg_tree, hf_msrp_attribute_length, tvb,

                        MSRP_ATTRIBUTE_LENGTH_OFFSET + msg_offset, 1, ENC_BIG_ENDIAN);

    proto_tree_add_item(msg_tree, hf_msrp_attribute_list_length, tvb,

                        MSRP_ATTRIBUTE_LIST_LENGTH_OFFSET + msg_offset, 2, ENC_BIG_ENDIAN);

}

/* dissect_msrp_common2 (called from dissect_msrp)

 *

 * dissect the following fields which are common to all MSRP attributes:

 *   Leave All Event

 *   Number of Values fields

 */

static void

dissect_msrp_common2(proto_tree *vect_attr_tree, tvbuff_t *tvb, int msg_offset)

{

    proto_tree_add_bitmask(vect_attr_tree, tvb, MSRP_VECTOR_HEADER_OFFSET + msg_offset,

                           hf_msrp_vector_header, ett_vector_header, vector_header_fields, ENC_BIG_ENDIAN);

}

/* dissect_msrp_talker_common (called from dissect_msrp)

 *

 * dissect the following fields which are common to all MSRP Talker attributes:

 *   Stream MAC DA

 *   Stream VLAN ID

 *   TSpec Bandwidth

 *   TSpec Frame Rate

 *   Priority (Traffic Class)

 *   Rank

 *   Accumulated Latency

 */

static void

dissect_msrp_talker_common(proto_tree *first_value_tree, tvbuff_t *tvb, int msg_offset)

{

    proto_tree_add_item(first_value_tree, hf_msrp_stream_da, tvb,

                        MSRP_STREAM_DA_OFFSET + msg_offset, 6, ENC_NA);

    proto_tree_add_item(first_value_tree, hf_msrp_vlan_id, tvb,

                        MSRP_VLAN_ID_OFFSET + msg_offset, 2, ENC_BIG_ENDIAN);

    proto_tree_add_item(first_value_tree, hf_msrp_tspec_max_frame_size, tvb,

                        MSRP_TSPEC_MAX_FRAME_SIZE_OFFSET + msg_offset, 2, ENC_BIG_ENDIAN);

    proto_tree_add_item(first_value_tree, hf_msrp_tspec_max_interval_frames, tvb,

                        MSRP_TSPEC_MAX_INTERVAL_FRAMES_OFFSET + msg_offset, 2, ENC_BIG_ENDIAN);

    proto_tree_add_bitmask(first_value_tree, tvb, MSRP_PRIORITY_AND_RANK_OFFSET + msg_offset,

                           hf_msrp_priority_and_rank, ett_priority_and_rank, priority_and_rank_fields, ENC_BIG_ENDIAN);

    proto_tree_add_item(first_value_tree, hf_msrp_accumulated_latency, tvb,

                        MSRP_ACCUMULATED_LATENCY_OFFSET + msg_offset, 4, ENC_BIG_ENDIAN);

}

/* dissect_msrp_talker_failed (called from dissect_msrp)

 *

 * dissect the following fields which are common to all MSRP Talker Failed attributes:

 *   Failure Information: Bridge ID

 *   Failure Information: Failure Code

 */

static void

dissect_msrp_talker_failed(proto_tree *first_value_tree, tvbuff_t *tvb, int msg_offset)

{

    proto_tree_add_item(first_value_tree, hf_msrp_failure_bridge_id, tvb,

                        MSRP_FAILURE_BRIDGE_ID_OFFSET + msg_offset, 8, ENC_BIG_ENDIAN);

    proto_tree_add_item(first_value_tree, hf_msrp_failure_code, tvb,

                        MSRP_FAILURE_CODE_OFFSET + msg_offset, 1, ENC_BIG_ENDIAN);

}

/* dissect_msrp_three_packed_event (called from dissect_msrp)

 *

 * dissect one or more ThreePackedEvents

 */

static unsigned

dissect_msrp_three_packed_event(proto_tree *vect_attr_tree, tvbuff_t *tvb, unsigned offset, uint16_t number_of_values)

{

    unsigned counter;

    for ( counter = 0; counter < number_of_values; ) {

        uint8_t value;

        uint8_t three_packed_event[3];

        value = tvb_get_uint8(tvb, offset);

        three_packed_event[0] = value / 36;

        value -= 36 * three_packed_event[0];

        three_packed_event[1] = value / 6;

        value -=  6 * three_packed_event[1];

        three_packed_event[2] = value;

        proto_tree_add_uint(vect_attr_tree, hf_msrp_three_packed_event, tvb, offset, sizeof(uint8_t),

                            three_packed_event[0]);

        counter++;

        if ( counter < number_of_values ) {

            proto_tree_add_uint(vect_attr_tree, hf_msrp_three_packed_event, tvb, offset, sizeof(uint8_t),

                                three_packed_event[1]);

            counter++;

        }

        if ( counter < number_of_values ) {

            proto_tree_add_uint(vect_attr_tree, hf_msrp_three_packed_event, tvb, offset, sizeof(uint8_t),

                                three_packed_event[2]);

            counter++;

        }

        offset++;

    }

    return offset ;

}

/* dissect_msrp_four_packed_event (called from dissect_msrp)

 *

 * dissect one or more FourPackedEvents

 */

static unsigned

dissect_msrp_four_packed_event(proto_tree *vect_attr_tree, tvbuff_t *tvb, unsigned offset, uint16_t number_of_values)

{

    unsigned counter;

    for ( counter = 0; counter < number_of_values; ) {

        uint8_t value;

        uint8_t four_packed_event[4];

        value = tvb_get_uint8(tvb, offset);

        four_packed_event[0] = (value & 0xc0) >> 6;

        four_packed_event[1] = (value & 0x30) >> 4;

        four_packed_event[2] = (value & 0x0c) >> 2;

        four_packed_event[3] = (value & 0x03);

        proto_tree_add_uint(vect_attr_tree, hf_msrp_four_packed_event, tvb, offset, sizeof(uint8_t),

                            four_packed_event[0]);

        counter++;

        if ( counter < number_of_values ) {

            proto_tree_add_uint(vect_attr_tree, hf_msrp_four_packed_event, tvb, offset, sizeof(uint8_t),

                                four_packed_event[1]);

            counter++;

        }

        if ( counter < number_of_values ) {

            proto_tree_add_uint(vect_attr_tree, hf_msrp_four_packed_event, tvb, offset, sizeof(uint8_t),

                                four_packed_event[2]);

            counter++;

        }

        if ( counter < number_of_values ) {

            proto_tree_add_uint(vect_attr_tree, hf_msrp_four_packed_event, tvb, offset, sizeof(uint8_t),

                                four_packed_event[3]);

            counter++;

        }

        offset++;

    }

    return offset;

}

/* dissect_main

 *

 * main dissect function that calls the other functions listed above as necessary

 */

static int

dissect_msrp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)

{

    /* Set up structures needed to add the protocol subtrees and manage them */

    proto_item *ti, *msg_ti, *attr_list_ti, *vect_attr_ti, *first_value_ti;

    proto_tree *msrp_tree, *msg_tree, *attr_list_tree, *vect_attr_tree, *first_value_tree;

    /* Make entries in Protocol column and Info column on summary display */

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

    col_set_str(pinfo->cinfo, COL_INFO, "Multiple Stream Reservation Protocol");

    if (tree) {

        uint8_t attribute_type;

        uint8_t attribute_length;

        uint16_t number_of_values;

        uint16_t attribute_list_length;

        unsigned offset = 0;

        int vect_attr_len;

        int msg_length;  /* Length of MSRP/MRP Message */

        int msg_offset;  /* Use when handling multiple messages.  This points to current msg being decoded. */

        int vect_offset; /* Use when handling multiple vector attributes.  This points to the current vector attribute being decoded. */

        ti = proto_tree_add_item(tree, proto_msrp, tvb, 0, -1, ENC_NA);

        msrp_tree = proto_item_add_subtree(ti, ett_msrp);

        proto_tree_add_item(msrp_tree, hf_msrp_proto_id, tvb, MSRP_PROTOCOL_VERSION_OFFSET, 1, ENC_BIG_ENDIAN);

        /* MSRP supports multiple MRP Messages per frame.  Handle those Messages in

         * the following while() loop. You will know you are at the end of the list

         * of messages when the EndMark (0x0000) is encountered instead of an

         * Attribute Type and Attribute Length (guaranteed to not be 0x0000).

         */

        msg_offset = 0;

        while (tvb_get_ntohs(tvb, MSRP_ATTRIBUTE_TYPE_OFFSET + msg_offset) != MSRP_END_MARK) {

            attribute_type = tvb_get_uint8(tvb, MSRP_ATTRIBUTE_TYPE_OFFSET + msg_offset);

            attribute_length = tvb_get_uint8(tvb, MSRP_ATTRIBUTE_LENGTH_OFFSET + msg_offset);

            attribute_list_length = tvb_get_ntohs(tvb, MSRP_ATTRIBUTE_LIST_LENGTH_OFFSET + msg_offset);

            /* MSRP Message is a group of fields

             *

             * Contains AttributeType (1 byte)

             *        + AttributeLength (1 byte)

             *        + AttributeListLength (2 bytes)

             *        + AttributeList (AttributeListLength bytes)

            *        bytes of data

            */

            msg_length = 1 + 1 + 2 + attribute_list_length;

            msg_ti = proto_tree_add_item(msrp_tree, hf_msrp_message, tvb,

                                         MSRP_MESSAGE_GROUP_OFFSET + msg_offset,

                                         msg_length, ENC_NA);

            msg_tree = proto_item_add_subtree(msg_ti, ett_msg);

            /* Append AttributeType description to the end of the "Message" heading */

            proto_item_append_text(msg_tree, ": %s (%d)",

                                   val_to_str_const(attribute_type, attribute_type_vals, "<Unknown>"),

                                   attribute_type);

            dissect_msrp_common1(msg_tree, tvb, msg_offset);

            /* MSRP AttributeList is a group of fields

             *

             * Contains AttributeListLength bytes of data

             */

            attr_list_ti = proto_tree_add_item(msg_tree, hf_msrp_attribute_list, tvb,

                                               MSRP_ATTRIBUTE_LIST_GROUP_OFFSET + msg_offset,

                                               attribute_list_length, ENC_NA);

            attr_list_tree = proto_item_add_subtree(attr_list_ti, ett_attr_list);

            /* MSRP supports multiple MRP Vector Attributes per Attribute List.  Handle those

             * Vector Attributes in the following while() loop. You will know you are at the

             * end of the list of Vector Attributes when the EndMark (0x0000) is encountered

             * instead of a Vector Header (guaranteed to not be 0x0000).

             */

            vect_offset = 0;

            while (tvb_get_ntohs(tvb, MSRP_VECTOR_HEADER_OFFSET + msg_offset + vect_offset) != MSRP_END_MARK) {

                /* MSRP VectorAttribute is a group of fields

                 *

                 * Contains VectorHeader (2 bytes)

                 *        + FirstValue (AttributeLength bytes)

                 *        + VectorThreePacked (NumberOfValues @ 3/vector bytes)

                 *        + VectorFourPacked (NumberOfValues @ 4/vector bytes only for Listener attributes)

                 *        bytes of data

                 */

                number_of_values = tvb_get_ntohs(tvb, MSRP_NUMBER_OF_VALUES_OFFSET + msg_offset + vect_offset)

                                   & MSRP_NUMBER_OF_VALUES_MASK;

                vect_attr_len = 2 + attribute_length + (number_of_values + 2)/3; /* stores 3 values per byte */

                if (attribute_type == MSRP_ATTRIBUTE_TYPE_LISTENER)

                    vect_attr_len += (number_of_values + 3)/4; /* stores 4 values per byte */

                vect_attr_ti = proto_tree_add_item(attr_list_tree, hf_msrp_vector_attribute, tvb,

                                                   MSRP_VECTOR_ATTRIBUTE_GROUP_OFFSET + msg_offset + vect_offset,

                                                   vect_attr_len, ENC_NA);

                vect_attr_tree = proto_item_add_subtree(vect_attr_ti, ett_vect_attr);

                dissect_msrp_common2(vect_attr_tree, tvb, msg_offset + vect_offset);

                if(attribute_type == MSRP_ATTRIBUTE_TYPE_DOMAIN) {

                    /* MSRP Domain FirstValue is a group of fields

                     *

                     * Contains SRclassID (1 byte)

                     *        + SRclassPriority (1 byte)

                     *        + SRclassVID (2 bytes)

                     *        bytes of data

                     */

                    first_value_ti = proto_tree_add_item(vect_attr_tree, hf_msrp_first_value, tvb,

                                                         MSRP_FIRST_VALUE_GROUP_OFFSET + msg_offset + vect_offset,

                                                         attribute_length, ENC_NA);

                    first_value_tree = proto_item_add_subtree(first_value_ti, ett_first_value);

                    /* Add Domain components to First Value tree */

                    proto_tree_add_item(first_value_tree, hf_msrp_sr_class_id, tvb,

                                        MSRP_FIRST_VALUE_GROUP_OFFSET + msg_offset + vect_offset, 1, ENC_BIG_ENDIAN);

                    proto_tree_add_item(first_value_tree, hf_msrp_sr_class_priority, tvb,

                                        MSRP_FIRST_VALUE_GROUP_OFFSET + msg_offset + vect_offset + 1, 1, ENC_BIG_ENDIAN);

                    proto_tree_add_item(first_value_tree, hf_msrp_sr_class_vid, tvb,

                                        MSRP_FIRST_VALUE_GROUP_OFFSET + msg_offset + vect_offset + 2, 2, ENC_BIG_ENDIAN);

                    /* Decode three packed events. */

                    offset = dissect_msrp_three_packed_event(vect_attr_tree, tvb,

                                                             MSRP_DOMAIN_THREE_PACKED_OFFSET + msg_offset + vect_offset,

                                                             number_of_values);

                }

                else {

                    /* MSRP Stream Reservations FirstValue is a group of fields

                     *

                     * Contains StreamID (8 bytes)

                     *        + DataFrameParameters (8 bytes on Talker attributes)

                     *        + TSpec (8 bytes on Talker attributes)

                     *        + PriorityAndRank (1 byte on Talker attributes)

                     *        + AccumulatedLatency (4 bytes on Talker attributes)

                     *        + FailureInformation (9 bytes on Talker Failed attributes)

                     *        bytes of data

                     */

                    first_value_ti = proto_tree_add_item(vect_attr_tree, hf_msrp_first_value, tvb,

                                                         MSRP_FIRST_VALUE_GROUP_OFFSET + msg_offset + vect_offset,

                                                         attribute_length, ENC_NA);

                    first_value_tree = proto_item_add_subtree(first_value_ti, ett_first_value);

                    /* Decode StreamID */

                    proto_tree_add_item(first_value_tree, hf_msrp_stream_id, tvb,

                                        MSRP_STREAM_ID_OFFSET + msg_offset + vect_offset, 8, ENC_BIG_ENDIAN);

                    switch ( attribute_type ) {

                    case MSRP_ATTRIBUTE_TYPE_LISTENER:

                        offset = dissect_msrp_three_packed_event(vect_attr_tree, tvb,

                                                                 MSRP_LISTENER_THREE_PACKED_OFFSET + msg_offset + vect_offset,

                                                                 number_of_values);

                        offset = dissect_msrp_four_packed_event(vect_attr_tree, tvb, offset, number_of_values);

                        break;

                    case MSRP_ATTRIBUTE_TYPE_TALKER_ADVERTISE:

                        dissect_msrp_talker_common(first_value_tree, tvb, msg_offset + vect_offset);

                        offset = dissect_msrp_three_packed_event(vect_attr_tree, tvb,

                                                                 MSRP_TALKER_ADVERTISE_THREE_PACKED_OFFSET + msg_offset + vect_offset,

                                                                 number_of_values);

                        break;

                    case MSRP_ATTRIBUTE_TYPE_TALKER_FAILED:

                        dissect_msrp_talker_common(first_value_tree, tvb, msg_offset + vect_offset);

                        dissect_msrp_talker_failed(first_value_tree, tvb, msg_offset + vect_offset);

                        offset = dissect_msrp_three_packed_event(vect_attr_tree, tvb,

                                                                 MSRP_TALKER_FAILED_THREE_PACKED_OFFSET + msg_offset + vect_offset,

                                                                 number_of_values);

                        break;

                    default:

                        proto_tree_add_expert(first_value_tree, pinfo, &ei_msrp_attribute_type, tvb, msg_offset + vect_offset, vect_attr_len);

                        break;

                    }

                }

                vect_offset += vect_attr_len; /* Move to next Vector Attribute, if there is one */

            } /* Multiple VectorAttribute while() */

            proto_tree_add_item(attr_list_tree, hf_msrp_end_mark, tvb, offset, 2, ENC_BIG_ENDIAN); /* VectorAttribute EndMark */

            msg_offset += msg_length; /* Move to next Message, if there is one */

        } /* Multiple Message while() */

        proto_tree_add_item(msrp_tree, hf_msrp_end_mark, tvb, offset+2, 2, ENC_BIG_ENDIAN); /* Message EndMark */

    }

    return tvb_captured_length(tvb);

}

/* Register the protocol with Wireshark */

void

proto_register_mrp_msrp(void)

{

    static hf_register_info hf[] = {

        { &hf_msrp_proto_id,

            { "Protocol Version",      "mrp-msrp.protocol_version",

              FT_UINT8,  BASE_DEC, NULL, 0x0, NULL, HFILL }

        },

        { &hf_msrp_message, /* Message is a group of fields */

            { "Message",               "mrp-msrp.message",

              FT_NONE,  BASE_NONE, NULL, 0x0, NULL, HFILL }

        },

        { &hf_msrp_attribute_type,

            { "Attribute Type",        "mrp-msrp.attribute_type",

              FT_UINT8,  BASE_DEC, VALS(attribute_type_vals), 0x0, NULL, HFILL }

        },

        { &hf_msrp_attribute_length,

            { "Attribute Length",      "mrp-msrp.attribute_length",

              FT_UINT8,  BASE_DEC, NULL, 0x0, NULL, HFILL }

        },

        { &hf_msrp_attribute_list_length,

            { "Attribute List Length", "mrp-msrp.attribute_list_length",

              FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }

        },

        { &hf_msrp_attribute_list, /* AttributeList is a group of fields */

            { "Attribute List",        "mrp-msrp.attribute_list",

              FT_NONE,  BASE_NONE, NULL, 0x0, NULL, HFILL }

        },

        { &hf_msrp_vector_attribute, /* VectorAttribute is a group of fields */

            { "Vector Attribute",      "mrp-msrp.vector_attribute",

              FT_NONE,  BASE_NONE, NULL, 0x0, NULL, HFILL }

        },

        { &hf_msrp_vector_header,

            { "Vector Header",         "mrp-msrp.vector_header",

              FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }

        },

        { &hf_msrp_leave_all_event,

            { "Leave All Event",       "mrp-msrp.leave_all_event",

              FT_UINT16, BASE_DEC, VALS(leave_all_vals), MSRP_LEAVE_ALL_EVENT_MASK, NULL, HFILL }

        },

        { &hf_msrp_number_of_values,

            { "Number of Values",      "mrp-msrp.number_of_values",

              FT_UINT16, BASE_DEC, NULL, MSRP_NUMBER_OF_VALUES_MASK, NULL, HFILL }

        },

        { &hf_msrp_first_value, /* FirstValue is a group of fields */

            { "First Value",           "mrp-msrp.first_value",

              FT_NONE,  BASE_NONE, NULL, 0x0, NULL, HFILL }

        },

        { &hf_msrp_stream_id,

            { "Stream ID",             "mrp-msrp.stream_id",

              FT_UINT64, BASE_HEX, NULL, 0x00, NULL, HFILL }

        },

        { &hf_msrp_stream_da,

            { "Stream DA",             "mrp-msrp.stream_da",

              FT_ETHER,  BASE_NONE, NULL, 0x00, NULL, HFILL }

        },

        { &hf_msrp_vlan_id,

            { "VLAN ID",               "mrp-msrp.vlan_id",

              FT_UINT16, BASE_HEX, NULL, 0x00, NULL, HFILL }

        },

        { &hf_msrp_tspec_max_frame_size,

            { "TSpec Max Frame Size",  "mrp-msrp.tspec_max_frame_size",

              FT_UINT16, BASE_DEC, NULL, 0x00, NULL, HFILL }

        },

        { &hf_msrp_tspec_max_interval_frames,

            { "TSpec Max Frame Interval", "mrp-msrp.tspec_max_interval_frames",

              FT_UINT16, BASE_DEC, NULL, 0x00, NULL, HFILL }

        },

        { &hf_msrp_priority_and_rank,

            { "Priority and Rank",     "mrp-msrp.priority_and_rank",

              FT_UINT8,  BASE_HEX, NULL, 0x0, NULL, HFILL }

        },

        { &hf_msrp_priority,

            { "Priority",              "mrp-msrp.priority",

              FT_UINT8,  BASE_DEC, VALS(priority_vals), MSRP_PRIORITY_MASK, NULL, HFILL }

        },

        { &hf_msrp_rank,

            { "Rank",                  "mrp-msrp.rank",

              FT_UINT8,  BASE_DEC, VALS(rank_vals), MSRP_RANK_MASK, NULL, HFILL }

        },

        { &hf_msrp_reserved,

            { "Reserved",              "mrp-msrp.reserved",

              FT_UINT8,  BASE_DEC, VALS(reserved_vals), MSRP_RESERVED_MASK, NULL, HFILL }

        },

        { &hf_msrp_accumulated_latency,

            { "Accumulated Latency",   "mrp-msrp.accumulated_latency",

              FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }

        },

        { &hf_msrp_failure_bridge_id,

            { "Failure Bridge ID",     "mrp-msrp.failure_bridge_id",

              FT_UINT64, BASE_HEX, NULL, 0x0, NULL, HFILL }

        },

        { &hf_msrp_failure_code,

            { "Failure Code",          "mrp-msrp.failure_code",

              FT_UINT8, BASE_DEC,  VALS(failure_vals), 0x0, NULL, HFILL }

        },

        { &hf_msrp_sr_class_id,

            { "SR Class ID",           "mrp-msrp.sr_class_id",

              FT_UINT8, BASE_DEC,  VALS(sr_class_vals), 0x0, NULL, HFILL }

        },

        { &hf_msrp_sr_class_priority,

            { "SR Class Priority",     "mrp-msrp.sr_class_priority",

              FT_UINT8, BASE_DEC,  NULL, 0x0, NULL, HFILL }

        },

        { &hf_msrp_sr_class_vid,

            { "SR Class VID",          "mrp-msrp.sr_class_vid",

              FT_UINT16, BASE_DEC,  NULL, 0x0, NULL, HFILL }

        },

        { &hf_msrp_three_packed_event,

            { "Attribute Event",       "mrp-msrp.three_packed_event",

              FT_UINT8, BASE_DEC,  VALS(three_packed_vals), 0x0, NULL, HFILL }

        },

        { &hf_msrp_four_packed_event,

            { "Declaration Type",      "mrp-msrp.four_packed_event",

              FT_UINT8, BASE_DEC,  VALS(four_packed_vals), 0x0, NULL, HFILL }

        },

        { &hf_msrp_end_mark,

            { "End Mark",              "mrp-msrp.end_mark",

              FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }

        },

    };

    /* Setup protocol subtree array */

    static int *ett[] = {

        &ett_msrp,

        &ett_msg,

        &ett_attr_list,

        &ett_vect_attr,

        &ett_vector_header,

        &ett_first_value,

        &ett_priority_and_rank

    };

    static ei_register_info ei[] = {

        { &ei_msrp_attribute_type, { "mrp-msrp.attribute_type.unknown", PI_PROTOCOL, PI_WARN, "Malformed TCP/IP Status", EXPFILL }},

    };

    expert_module_t* expert_msrp;

    /* Register the protocol name and description */

    proto_msrp = proto_register_protocol("Multiple Stream Reservation Protocol",

                                         "MRP-MSRP", "mrp-msrp");

    /* Required function calls to register the header fields and subtrees used */

    proto_register_field_array(proto_msrp, hf, array_length(hf));

    proto_register_subtree_array(ett, array_length(ett));

    expert_msrp = expert_register_protocol(proto_msrp);

    expert_register_field_array(expert_msrp, ei, array_length(ei));

    /* Register the dissector */

    msrp_handle = register_dissector("mrp-msrp", dissect_msrp, proto_msrp);

}

void

proto_reg_handoff_mrp_msrp(void)

{

    dissector_add_uint("ethertype", ETHERTYPE_MSRP, msrp_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:

 */