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wireshark/epan/dissectors/packet-mrp-msrp.c

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/* 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);
/* 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 = -1;
static int hf_msrp_proto_id = -1;
static int hf_msrp_message = -1; /* Message is a group of fields */
static int hf_msrp_attribute_type = -1;
static int hf_msrp_attribute_length = -1;
static int hf_msrp_attribute_list_length = -1;
static int hf_msrp_attribute_list = -1; /* AttributeList is a group of fields */
static int hf_msrp_vector_attribute = -1; /* VectorAttribute is a group of fields */
/* The following VectorHeader contains the LeaveAllEvent and NumberOfValues */
static int hf_msrp_vector_header = -1;
static int hf_msrp_leave_all_event = -1;
static int hf_msrp_number_of_values = -1;
static gint ett_vector_header = -1;
static int * const vector_header_fields[] = {
&hf_msrp_leave_all_event,
&hf_msrp_number_of_values,
NULL
};
static int hf_msrp_first_value = -1; /* FirstValue is a group of fields */
static int hf_msrp_stream_id = -1;
static int hf_msrp_stream_da = -1;
static int hf_msrp_vlan_id = -1;
static int hf_msrp_tspec_max_frame_size = -1;
static int hf_msrp_tspec_max_interval_frames = -1;
static int hf_msrp_priority_and_rank = -1;
static int hf_msrp_priority = -1;
static int hf_msrp_rank = -1;
static int hf_msrp_reserved = -1;
static gint ett_priority_and_rank = -1;
static int * const priority_and_rank_fields[] = {
&hf_msrp_priority,
&hf_msrp_rank,
&hf_msrp_reserved,
NULL
};
static int hf_msrp_sr_class_id = -1;
static int hf_msrp_sr_class_priority = -1;
static int hf_msrp_sr_class_vid = -1;
static int hf_msrp_accumulated_latency = -1;
static int hf_msrp_failure_bridge_id = -1;
static int hf_msrp_failure_code = -1;
static int hf_msrp_three_packed_event = -1;
static int hf_msrp_four_packed_event = -1;
static int hf_msrp_end_mark = -1;
/* Initialize the subtree pointers */
static gint ett_msrp = -1;
static gint ett_msg = -1;
static gint ett_attr_list = -1;
static gint ett_vect_attr = -1;
static gint ett_first_value = -1;
static expert_field ei_msrp_attribute_type = EI_INIT;
/**********************************************************/
/* 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 guint
dissect_msrp_three_packed_event(proto_tree *vect_attr_tree, tvbuff_t *tvb, guint offset, guint16 number_of_values)
{
guint counter;
for ( counter = 0; counter < number_of_values; ) {
guint8 value;
guint8 three_packed_event[3];
value = tvb_get_guint8(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(guint8),
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(guint8),
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(guint8),
three_packed_event[2]);
counter++;
}
offset++;
}
return( offset );
}
/* dissect_msrp_four_packed_event (called from dissect_msrp)
*
* dissect one or more FourPackedEvents
*/
static guint
dissect_msrp_four_packed_event(proto_tree *vect_attr_tree, tvbuff_t *tvb, guint offset, guint16 number_of_values)
{
guint counter;
for ( counter = 0; counter < number_of_values; ) {
guint8 value;
guint8 four_packed_event[4];
value = tvb_get_guint8(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(guint8),
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(guint8),
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(guint8),
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(guint8),
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) {
guint8 attribute_type;
guint8 attribute_length;
guint16 number_of_values;
guint16 attribute_list_length;
guint 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_guint8(tvb, MSRP_ATTRIBUTE_TYPE_OFFSET + msg_offset);
attribute_length = tvb_get_guint8(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 gint *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));
}
void
proto_reg_handoff_mrp_msrp(void)
{
dissector_handle_t msrp_handle;
msrp_handle = create_dissector_handle(dissect_msrp, proto_msrp);
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:
*/
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