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wireshark/epan/dissectors/packet-mrp-msrp.c
Guy Harris e1d9a226a2 Fix the type of arrays of pointers to hf_ values for bitfield routines. 
The static arrays are supposed to be arrays of const pointers to int,
not arrays of non-const pointers to const int.

Fixing that means some bugs (scribbling on what's *supposed* to be a
const array) will be caught (see packet-ieee80211-radiotap.c for
examples, the first of which inspired this change and the second of
which was discovered while testing compiles with this change), and
removes the need for some annoying casts.

Also make some of those arrays static while we're at it.

Update documentation and dissector-generator tools.

Change-Id: I789da5fc60aadc15797cefecfd9a9fbe9a130ccc
Reviewed-on: https://code.wireshark.org/review/37517
Petri-Dish: Guy Harris <gharris@sonic.net>
Tested-by: Petri Dish Buildbot
Reviewed-by: Anders Broman <a.broman58@gmail.com>
2020-06-19 11:32:26 +00:00

796 lines
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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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