epan/dissectors/packet-mrp-msrp.c

   1 /* packet-mrp_msrp.c
   2  * Routines for MSRP (MRP Multiple Stream Reservation Protocol) dissection
   3  * Copyright 2010, Torrey Atcitty <tatcitty@harman.com>
   4  *                 Craig Gunther <craig.gunther@harman.com>
   5  *
   6  * Based on the code from packet-mmrp.c (MMRP) from
   7  * Markus Seehofer <mseehofe@nt.hirschmann.de> Copyright 2001
   8  *
   9  * Wireshark - Network traffic analyzer
  10  * By Gerald Combs <gerald@wireshark.org>
  11  * Copyright 1998 Gerald Combs
  12  *
  13  * SPDX-License-Identifier: GPL-2.0-or-later
  14  *
  15  * The MSRP Protocol specification can be found at the following:
  16  * http://www.ieee802.org/1/files/private/at-drafts/d6/802-1at-d6-0.pdf
  17  *
  18  */
  19
  20 #include "config.h"
  21
  22 #include <epan/packet.h>
  23 #include <epan/expert.h>
  24 #include <epan/etypes.h>
  25
  26 void proto_register_mrp_msrp(void);
  27 void proto_reg_handoff_mrp_msrp(void);
  28
  29 static dissector_handle_t msrp_handle;
  30
  31 /* MSRP End Mark Sequence */
  32 #define MSRP_END_MARK       0x0000
  33
  34 /**********************************************************/
  35 /* Offsets of fields within an MSRP packet                */
  36 /**********************************************************/
  37 #define MSRP_PROTOCOL_VERSION_OFFSET        0
  38
  39 /* Next comes the MSRP Message group */
  40 #define MSRP_MESSAGE_GROUP_OFFSET          (MSRP_PROTOCOL_VERSION_OFFSET + 1) /* Message is a group of fields */
  41 #define MSRP_ATTRIBUTE_TYPE_OFFSET         (MSRP_MESSAGE_GROUP_OFFSET)
  42 #define MSRP_ATTRIBUTE_LENGTH_OFFSET       (MSRP_ATTRIBUTE_TYPE_OFFSET + 1)
  43 #define MSRP_ATTRIBUTE_LIST_LENGTH_OFFSET  (MSRP_ATTRIBUTE_LENGTH_OFFSET + 1)
  44
  45 /* Next comes the MSRP AttributeList group */
  46 #define MSRP_ATTRIBUTE_LIST_GROUP_OFFSET   (MSRP_ATTRIBUTE_LIST_LENGTH_OFFSET + 2) /* AttributeList is a group of fields */
  47
  48 /* Next comes the MSRP VectorAttribute group */
  49 #define MSRP_VECTOR_ATTRIBUTE_GROUP_OFFSET (MSRP_ATTRIBUTE_LIST_GROUP_OFFSET) /* VectorAttribute is a group of fields */
  50 #define MSRP_VECTOR_HEADER_OFFSET          (MSRP_VECTOR_ATTRIBUTE_GROUP_OFFSET) /* contains the following two fields */
  51 #define MSRP_LEAVE_ALL_EVENT_OFFSET        (MSRP_VECTOR_HEADER_OFFSET)
  52 #define MSRP_LEAVE_ALL_EVENT_MASK           0xE000
  53 #define MSRP_NUMBER_OF_VALUES_OFFSET       (MSRP_VECTOR_HEADER_OFFSET)
  54 #define MSRP_NUMBER_OF_VALUES_MASK          0x1fff
  55
  56 /* Next comes the MSRP FirstValue group */
  57 #define MSRP_FIRST_VALUE_GROUP_OFFSET      (MSRP_VECTOR_HEADER_OFFSET + 2) /* FirstValue is a group of fields */
  58 #define MSRP_STREAM_ID_OFFSET              (MSRP_FIRST_VALUE_GROUP_OFFSET)
  59 #define MSRP_STREAM_DA_OFFSET              (MSRP_STREAM_ID_OFFSET + 8)
  60 #define MSRP_VLAN_ID_OFFSET                (MSRP_STREAM_DA_OFFSET + 6)
  61 #define MSRP_TSPEC_MAX_FRAME_SIZE_OFFSET       (MSRP_VLAN_ID_OFFSET + 2)
  62 #define MSRP_TSPEC_MAX_INTERVAL_FRAMES_OFFSET  (MSRP_TSPEC_MAX_FRAME_SIZE_OFFSET + 2)
  63 #define MSRP_PRIORITY_AND_RANK_OFFSET          (MSRP_TSPEC_MAX_INTERVAL_FRAMES_OFFSET + 2) /* contains the following two fields */
  64 #define MSRP_PRIORITY_OFFSET               (MSRP_PRIORITY_AND_RANK_OFFSET)
  65 #define MSRP_PRIORITY_MASK                  0xe0
  66 #define MSRP_RANK_OFFSET                   (MSRP_PRIORITY_AND_RANK_OFFSET)
  67 #define MSRP_RANK_MASK                      0x10
  68 #define MSRP_RESERVED_OFFSET               (MSRP_PRIORITY_AND_RANK_OFFSET)
  69 #define MSRP_RESERVED_MASK                  0x0F
  70 #define MSRP_ACCUMULATED_LATENCY_OFFSET    (MSRP_PRIORITY_AND_RANK_OFFSET + 1)
  71 #define MSRP_FAILURE_BRIDGE_ID_OFFSET      (MSRP_ACCUMULATED_LATENCY_OFFSET + 4)
  72 #define MSRP_FAILURE_CODE_OFFSET           (MSRP_FAILURE_BRIDGE_ID_OFFSET + 8)
  73
  74 #define MSRP_DOMAIN_THREE_PACKED_OFFSET           (MSRP_FIRST_VALUE_GROUP_OFFSET + 4)
  75 #define MSRP_LISTENER_THREE_PACKED_OFFSET         (MSRP_STREAM_ID_OFFSET + 8)
  76 #define MSRP_TALKER_ADVERTISE_THREE_PACKED_OFFSET (MSRP_ACCUMULATED_LATENCY_OFFSET + 4)
  77 #define MSRP_TALKER_FAILED_THREE_PACKED_OFFSET    (MSRP_FAILURE_CODE_OFFSET + 1)
  78
  79 /**********************************************************/
  80 /* Valid field contents                                   */
  81 /**********************************************************/
  82
  83 /* Attribute Type definitions */
  84 #define MSRP_ATTRIBUTE_TYPE_TALKER_ADVERTISE    0x01
  85 #define MSRP_ATTRIBUTE_TYPE_TALKER_FAILED       0x02
  86 #define MSRP_ATTRIBUTE_TYPE_LISTENER            0x03
  87 #define MSRP_ATTRIBUTE_TYPE_DOMAIN              0x04
  88 static const value_string attribute_type_vals[] = {
  89     { MSRP_ATTRIBUTE_TYPE_TALKER_ADVERTISE, "Talker Advertise" },
  90     { MSRP_ATTRIBUTE_TYPE_TALKER_FAILED,    "Talker Failed" },
  91     { MSRP_ATTRIBUTE_TYPE_LISTENER,         "Listener" },
  92     { MSRP_ATTRIBUTE_TYPE_DOMAIN,           "Domain" },
  93     { 0,                                    NULL }
  94 };
  95
  96 /* Leave All Event definitions */
  97 #define MSRP_NULLLEAVEALL   0
  98 #define MSRP_LEAVEALL       1
  99 static const value_string leave_all_vals[] = {
 100     { MSRP_NULLLEAVEALL, "Null" },
 101     { MSRP_LEAVEALL,     "Leave All" },
 102     { 0,                 NULL }
 103 };
 104
 105 /* Priority definitions */
 106  #define MSRP_TRAFFIC_CLASS_A    3
 107  #define MSRP_TRAFFIC_CLASS_B    2
 108
 109 static const value_string priority_vals[] = {
 110     { MSRP_TRAFFIC_CLASS_A, "Traffic Class A" },
 111     { MSRP_TRAFFIC_CLASS_B, "Traffic Class B" },
 112     { 0,                    NULL }
 113 };
 114
 115 /* Rank definitions */
 116 static const value_string rank_vals[] = {
 117     { 0, "Emergency" },
 118     { 1, "Non-emergency" },
 119     { 0, NULL }
 120 };
 121 static const value_string reserved_vals[] = {
 122     {  0, "Reserved-0" },
 123     {  1, "Reserved-1" },
 124     {  2, "Reserved-2" },
 125     {  3, "Reserved-3" },
 126     {  4, "Reserved-4" },
 127     {  5, "Reserved-5" },
 128     {  6, "Reserved-6" },
 129     {  7, "Reserved-7" },
 130     {  8, "Reserved-8" },
 131     {  9, "Reserved-9" },
 132     { 10, "Reserved-10" },
 133     { 11, "Reserved-11" },
 134     { 12, "Reserved-12" },
 135     { 13, "Reserved-13" },
 136     { 14, "Reserved-14" },
 137     { 15, "Reserved-15" },
 138     { 0,  NULL }
 139 };
 140
 141 /* Failure Code definitions */
 142 static const value_string failure_vals[] = {
 143     {  1, "Insufficient Bandwidth" },
 144     {  2, "Insufficient Bridge resources" },
 145     {  3, "Insufficient Bandwidth for Traffic Class" },
 146     {  4, "Stream ID in use by another Talker" },
 147     {  5, "Stream destination_address already in use" },
 148     {  6, "Stream preempted by higher rank" },
 149     {  7, "Reported latency has changed" },
 150     {  8, "Egress port in not AVB capable" },
 151     {  9, "Use a different destination address (i.e. MAC DA hash table full)" },
 152     { 10, "Out of MSRP resources" },
 153     { 11, "Out of MMRP resources" },
 154     { 12, "Cannot store destination_address (i.e. Bridge is out of MAC resources)" },
 155     { 13, "Requested priority not an SR Class (3.3) priority" },
 156     { 14, "MaxFrameSize (35.2.2.8.4(a)) is too large for media" },
 157     { 15, "msrpMaxFanInPorts (35.2.1.4(f)) limit has been reached" },
 158     { 16, "Changes in FirstValue for a registered StreamID" },
 159     { 17, "VLAN is blocked on this egress port (Registration Forbidden)" },
 160     { 18, "VLAN tagging is disabled on this egress port (untagged set)" },
 161     { 19, "SR class priority mismatch" },
 162     { 0, NULL }
 163 };
 164
 165 /* SR class ID definitions */
 166  #define MSRP_SR_CLASS_A    6
 167  #define MSRP_SR_CLASS_B    5
 168  #define MSRP_SR_CLASS_C    4
 169  #define MSRP_SR_CLASS_D    3
 170  #define MSRP_SR_CLASS_E    2
 171  #define MSRP_SR_CLASS_F    1
 172  #define MSRP_SR_CLASS_G    0
 173
 174 static const value_string sr_class_vals[] = {
 175     { MSRP_SR_CLASS_A, "SR Class A" },
 176     { MSRP_SR_CLASS_B, "SR Class B" },
 177     { MSRP_SR_CLASS_C, "SR Class C" },
 178     { MSRP_SR_CLASS_D, "SR Class D" },
 179     { MSRP_SR_CLASS_E, "SR Class E" },
 180     { MSRP_SR_CLASS_F, "SR Class F" },
 181     { MSRP_SR_CLASS_G, "SR Class G" },
 182     { 0,                       NULL }
 183 };
 184
 185 /* Three Packed Event definitions */
 186 static const value_string three_packed_vals[] = {
 187     { 0, "New" },
 188     { 1, "JoinIn" },
 189     { 2, "In" },
 190     { 3, "JoinMt" },
 191     { 4, "Mt" },
 192     { 5, "Lv" },
 193     { 0, NULL }
 194 };
 195
 196 /* Four Packed Event definitions */
 197 static const value_string four_packed_vals[] = {
 198     { 0, "Ignore" },
 199     { 1, "Asking Failed" },
 200     { 2, "Ready" },
 201     { 3, "Ready Failed" },
 202     { 0, NULL }
 203 };
 204
 205 /**********************************************************/
 206 /* Initialize the protocol and registered fields          */
 207 /**********************************************************/
 208 static int proto_msrp;
 209 static int hf_msrp_proto_id;
 210 static int hf_msrp_message; /* Message is a group of fields */
 211 static int hf_msrp_attribute_type;
 212 static int hf_msrp_attribute_length;
 213 static int hf_msrp_attribute_list_length;
 214 static int hf_msrp_attribute_list; /* AttributeList is a group of fields */
 215 static int hf_msrp_vector_attribute; /* VectorAttribute is a group of fields */
 216
 217 /* The following VectorHeader contains the LeaveAllEvent and NumberOfValues */
 218 static int hf_msrp_vector_header;
 219 static int hf_msrp_leave_all_event;
 220 static int hf_msrp_number_of_values;
 221 static int ett_vector_header;
 222 static int * const vector_header_fields[] = {
 223     &hf_msrp_leave_all_event,
 224     &hf_msrp_number_of_values,
 225     NULL
 226 };
 227
 228 static int hf_msrp_first_value; /* FirstValue is a group of fields */
 229 static int hf_msrp_stream_id;
 230 static int hf_msrp_stream_da;
 231 static int hf_msrp_vlan_id;
 232 static int hf_msrp_tspec_max_frame_size;
 233 static int hf_msrp_tspec_max_interval_frames;
 234 static int hf_msrp_priority_and_rank;
 235 static int hf_msrp_priority;
 236 static int hf_msrp_rank;
 237 static int hf_msrp_reserved;
 238 static int ett_priority_and_rank;
 239 static int * const priority_and_rank_fields[] = {
 240     &hf_msrp_priority,
 241     &hf_msrp_rank,
 242     &hf_msrp_reserved,
 243     NULL
 244 };
 245
 246 static int hf_msrp_sr_class_id;
 247 static int hf_msrp_sr_class_priority;
 248 static int hf_msrp_sr_class_vid;
 249
 250 static int hf_msrp_accumulated_latency;
 251 static int hf_msrp_failure_bridge_id;
 252 static int hf_msrp_failure_code;
 253
 254 static int hf_msrp_three_packed_event;
 255 static int hf_msrp_four_packed_event;
 256
 257 static int hf_msrp_end_mark;
 258
 259 /* Initialize the subtree pointers */
 260 static int ett_msrp;
 261 static int ett_msg;
 262 static int ett_attr_list;
 263 static int ett_vect_attr;
 264 static int ett_first_value;
 265
 266 static expert_field ei_msrp_attribute_type;
 267
 268 /**********************************************************/
 269 /* Dissector starts here                                  */
 270 /**********************************************************/
 271
 272 /* dissect_msrp_common1 (called from dissect_msrp)
 273  *
 274  * dissect the following fields which are common to all MSRP attributes:
 275  *   Attribute Type
 276  *   Attribute Length
 277  *   Attribute List Length
 278  */
 279 static void
 280 dissect_msrp_common1(proto_tree *msg_tree, tvbuff_t *tvb, int msg_offset)
 281 {
 282     proto_tree_add_item(msg_tree, hf_msrp_attribute_type, tvb,
 283                         MSRP_ATTRIBUTE_TYPE_OFFSET + msg_offset, 1, ENC_BIG_ENDIAN);
 284     proto_tree_add_item(msg_tree, hf_msrp_attribute_length, tvb,
 285                         MSRP_ATTRIBUTE_LENGTH_OFFSET + msg_offset, 1, ENC_BIG_ENDIAN);
 286     proto_tree_add_item(msg_tree, hf_msrp_attribute_list_length, tvb,
 287                         MSRP_ATTRIBUTE_LIST_LENGTH_OFFSET + msg_offset, 2, ENC_BIG_ENDIAN);
 288 }
 289
 290
 291 /* dissect_msrp_common2 (called from dissect_msrp)
 292  *
 293  * dissect the following fields which are common to all MSRP attributes:
 294  *   Leave All Event
 295  *   Number of Values fields
 296  */
 297 static void
 298 dissect_msrp_common2(proto_tree *vect_attr_tree, tvbuff_t *tvb, int msg_offset)
 299 {
 300     proto_tree_add_bitmask(vect_attr_tree, tvb, MSRP_VECTOR_HEADER_OFFSET + msg_offset,
 301                            hf_msrp_vector_header, ett_vector_header, vector_header_fields, ENC_BIG_ENDIAN);
 302 }
 303
 304
 305 /* dissect_msrp_talker_common (called from dissect_msrp)
 306  *
 307  * dissect the following fields which are common to all MSRP Talker attributes:
 308  *   Stream MAC DA
 309  *   Stream VLAN ID
 310  *   TSpec Bandwidth
 311  *   TSpec Frame Rate
 312  *   Priority (Traffic Class)
 313  *   Rank
 314  *   Accumulated Latency
 315  */
 316 static void
 317 dissect_msrp_talker_common(proto_tree *first_value_tree, tvbuff_t *tvb, int msg_offset)
 318 {
 319
 320     proto_tree_add_item(first_value_tree, hf_msrp_stream_da, tvb,
 321                         MSRP_STREAM_DA_OFFSET + msg_offset, 6, ENC_NA);
 322     proto_tree_add_item(first_value_tree, hf_msrp_vlan_id, tvb,
 323                         MSRP_VLAN_ID_OFFSET + msg_offset, 2, ENC_BIG_ENDIAN);
 324     proto_tree_add_item(first_value_tree, hf_msrp_tspec_max_frame_size, tvb,
 325                         MSRP_TSPEC_MAX_FRAME_SIZE_OFFSET + msg_offset, 2, ENC_BIG_ENDIAN);
 326     proto_tree_add_item(first_value_tree, hf_msrp_tspec_max_interval_frames, tvb,
 327                         MSRP_TSPEC_MAX_INTERVAL_FRAMES_OFFSET + msg_offset, 2, ENC_BIG_ENDIAN);
 328     proto_tree_add_bitmask(first_value_tree, tvb, MSRP_PRIORITY_AND_RANK_OFFSET + msg_offset,
 329                            hf_msrp_priority_and_rank, ett_priority_and_rank, priority_and_rank_fields, ENC_BIG_ENDIAN);
 330     proto_tree_add_item(first_value_tree, hf_msrp_accumulated_latency, tvb,
 331                         MSRP_ACCUMULATED_LATENCY_OFFSET + msg_offset, 4, ENC_BIG_ENDIAN);
 332 }
 333
 334
 335 /* dissect_msrp_talker_failed (called from dissect_msrp)
 336  *
 337  * dissect the following fields which are common to all MSRP Talker Failed attributes:
 338  *   Failure Information: Bridge ID
 339  *   Failure Information: Failure Code
 340  */
 341 static void
 342 dissect_msrp_talker_failed(proto_tree *first_value_tree, tvbuff_t *tvb, int msg_offset)
 343 {
 344
 345     proto_tree_add_item(first_value_tree, hf_msrp_failure_bridge_id, tvb,
 346                         MSRP_FAILURE_BRIDGE_ID_OFFSET + msg_offset, 8, ENC_BIG_ENDIAN);
 347     proto_tree_add_item(first_value_tree, hf_msrp_failure_code, tvb,
 348                         MSRP_FAILURE_CODE_OFFSET + msg_offset, 1, ENC_BIG_ENDIAN);
 349 }
 350
 351
 352 /* dissect_msrp_three_packed_event (called from dissect_msrp)
 353  *
 354  * dissect one or more ThreePackedEvents
 355  */
 356 static unsigned
 357 dissect_msrp_three_packed_event(proto_tree *vect_attr_tree, tvbuff_t *tvb, unsigned offset, uint16_t number_of_values)
 358 {
 359     unsigned counter;
 360
 361     for ( counter = 0; counter < number_of_values; ) {
 362         uint8_t value;
 363         uint8_t three_packed_event[3];
 364
 365         value = tvb_get_uint8(tvb, offset);
 366         three_packed_event[0] = value / 36;
 367         value -= 36 * three_packed_event[0];
 368         three_packed_event[1] = value / 6;
 369         value -=  6 * three_packed_event[1];
 370         three_packed_event[2] = value;
 371
 372         proto_tree_add_uint(vect_attr_tree, hf_msrp_three_packed_event, tvb, offset, sizeof(uint8_t),
 373                             three_packed_event[0]);
 374         counter++;
 375         if ( counter < number_of_values ) {
 376             proto_tree_add_uint(vect_attr_tree, hf_msrp_three_packed_event, tvb, offset, sizeof(uint8_t),
 377                                 three_packed_event[1]);
 378             counter++;
 379         }
 380         if ( counter < number_of_values ) {
 381             proto_tree_add_uint(vect_attr_tree, hf_msrp_three_packed_event, tvb, offset, sizeof(uint8_t),
 382                                 three_packed_event[2]);
 383             counter++;
 384         }
 385
 386         offset++;
 387     }
 388     return offset ;
 389 }
 390
 391
 392 /* dissect_msrp_four_packed_event (called from dissect_msrp)
 393  *
 394  * dissect one or more FourPackedEvents
 395  */
 396 static unsigned
 397 dissect_msrp_four_packed_event(proto_tree *vect_attr_tree, tvbuff_t *tvb, unsigned offset, uint16_t number_of_values)
 398 {
 399     unsigned counter;
 400
 401     for ( counter = 0; counter < number_of_values; ) {
 402         uint8_t value;
 403         uint8_t four_packed_event[4];
 404
 405         value = tvb_get_uint8(tvb, offset);
 406         four_packed_event[0] = (value & 0xc0) >> 6;
 407         four_packed_event[1] = (value & 0x30) >> 4;
 408         four_packed_event[2] = (value & 0x0c) >> 2;
 409         four_packed_event[3] = (value & 0x03);
 410
 411         proto_tree_add_uint(vect_attr_tree, hf_msrp_four_packed_event, tvb, offset, sizeof(uint8_t),
 412                             four_packed_event[0]);
 413         counter++;
 414         if ( counter < number_of_values ) {
 415             proto_tree_add_uint(vect_attr_tree, hf_msrp_four_packed_event, tvb, offset, sizeof(uint8_t),
 416                                 four_packed_event[1]);
 417             counter++;
 418         }
 419         if ( counter < number_of_values ) {
 420             proto_tree_add_uint(vect_attr_tree, hf_msrp_four_packed_event, tvb, offset, sizeof(uint8_t),
 421                                 four_packed_event[2]);
 422             counter++;
 423         }
 424         if ( counter < number_of_values ) {
 425             proto_tree_add_uint(vect_attr_tree, hf_msrp_four_packed_event, tvb, offset, sizeof(uint8_t),
 426                                 four_packed_event[3]);
 427             counter++;
 428         }
 429
 430         offset++;
 431     }
 432     return offset;
 433 }
 434
 435
 436 /* dissect_main
 437  *
 438  * main dissect function that calls the other functions listed above as necessary
 439  */
 440 static int
 441 dissect_msrp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
 442 {
 443     /* Set up structures needed to add the protocol subtrees and manage them */
 444     proto_item *ti, *msg_ti, *attr_list_ti, *vect_attr_ti, *first_value_ti;
 445     proto_tree *msrp_tree, *msg_tree, *attr_list_tree, *vect_attr_tree, *first_value_tree;
 446
 447     /* Make entries in Protocol column and Info column on summary display */
 448     col_set_str(pinfo->cinfo, COL_PROTOCOL, "MRP-MSRP");
 449
 450     col_set_str(pinfo->cinfo, COL_INFO, "Multiple Stream Reservation Protocol");
 451
 452     if (tree) {
 453         uint8_t attribute_type;
 454         uint8_t attribute_length;
 455         uint16_t number_of_values;
 456         uint16_t attribute_list_length;
 457         unsigned offset = 0;
 458         int vect_attr_len;
 459         int msg_length;  /* Length of MSRP/MRP Message */
 460         int msg_offset;  /* Use when handling multiple messages.  This points to current msg being decoded. */
 461         int vect_offset; /* Use when handling multiple vector attributes.  This points to the current vector attribute being decoded. */
 462
 463         ti = proto_tree_add_item(tree, proto_msrp, tvb, 0, -1, ENC_NA);
 464         msrp_tree = proto_item_add_subtree(ti, ett_msrp);
 465
 466         proto_tree_add_item(msrp_tree, hf_msrp_proto_id, tvb, MSRP_PROTOCOL_VERSION_OFFSET, 1, ENC_BIG_ENDIAN);
 467
 468         /* MSRP supports multiple MRP Messages per frame.  Handle those Messages in
 469          * the following while() loop. You will know you are at the end of the list
 470          * of messages when the EndMark (0x0000) is encountered instead of an
 471          * Attribute Type and Attribute Length (guaranteed to not be 0x0000).
 472          */
 473         msg_offset = 0;
 474         while (tvb_get_ntohs(tvb, MSRP_ATTRIBUTE_TYPE_OFFSET + msg_offset) != MSRP_END_MARK) {
 475
 476             attribute_type = tvb_get_uint8(tvb, MSRP_ATTRIBUTE_TYPE_OFFSET + msg_offset);
 477             attribute_length = tvb_get_uint8(tvb, MSRP_ATTRIBUTE_LENGTH_OFFSET + msg_offset);
 478             attribute_list_length = tvb_get_ntohs(tvb, MSRP_ATTRIBUTE_LIST_LENGTH_OFFSET + msg_offset);
 479
 480             /* MSRP Message is a group of fields
 481              *
 482              * Contains AttributeType (1 byte)
 483              *        + AttributeLength (1 byte)
 484              *        + AttributeListLength (2 bytes)
 485              *        + AttributeList (AttributeListLength bytes)
 486             *        bytes of data
 487             */
 488             msg_length = 1 + 1 + 2 + attribute_list_length;
 489             msg_ti = proto_tree_add_item(msrp_tree, hf_msrp_message, tvb,
 490                                          MSRP_MESSAGE_GROUP_OFFSET + msg_offset,
 491                                          msg_length, ENC_NA);
 492             msg_tree = proto_item_add_subtree(msg_ti, ett_msg);
 493
 494             /* Append AttributeType description to the end of the "Message" heading */
 495             proto_item_append_text(msg_tree, ": %s (%d)",
 496                                    val_to_str_const(attribute_type, attribute_type_vals, "<Unknown>"),
 497                                    attribute_type);
 498
 499             dissect_msrp_common1(msg_tree, tvb, msg_offset);
 500
 501             /* MSRP AttributeList is a group of fields
 502              *
 503              * Contains AttributeListLength bytes of data
 504              */
 505             attr_list_ti = proto_tree_add_item(msg_tree, hf_msrp_attribute_list, tvb,
 506                                                MSRP_ATTRIBUTE_LIST_GROUP_OFFSET + msg_offset,
 507                                                attribute_list_length, ENC_NA);
 508             attr_list_tree = proto_item_add_subtree(attr_list_ti, ett_attr_list);
 509
 510
 511             /* MSRP supports multiple MRP Vector Attributes per Attribute List.  Handle those
 512              * Vector Attributes in the following while() loop. You will know you are at the
 513              * end of the list of Vector Attributes when the EndMark (0x0000) is encountered
 514              * instead of a Vector Header (guaranteed to not be 0x0000).
 515              */
 516             vect_offset = 0;
 517             while (tvb_get_ntohs(tvb, MSRP_VECTOR_HEADER_OFFSET + msg_offset + vect_offset) != MSRP_END_MARK) {
 518                 /* MSRP VectorAttribute is a group of fields
 519                  *
 520                  * Contains VectorHeader (2 bytes)
 521                  *        + FirstValue (AttributeLength bytes)
 522                  *        + VectorThreePacked (NumberOfValues @ 3/vector bytes)
 523                  *        + VectorFourPacked (NumberOfValues @ 4/vector bytes only for Listener attributes)
 524                  *        bytes of data
 525                  */
 526                 number_of_values = tvb_get_ntohs(tvb, MSRP_NUMBER_OF_VALUES_OFFSET + msg_offset + vect_offset)
 527                                    & MSRP_NUMBER_OF_VALUES_MASK;
 528
 529                 vect_attr_len = 2 + attribute_length + (number_of_values + 2)/3; /* stores 3 values per byte */
 530                 if (attribute_type == MSRP_ATTRIBUTE_TYPE_LISTENER)
 531                     vect_attr_len += (number_of_values + 3)/4; /* stores 4 values per byte */
 532
 533                 vect_attr_ti = proto_tree_add_item(attr_list_tree, hf_msrp_vector_attribute, tvb,
 534                                                    MSRP_VECTOR_ATTRIBUTE_GROUP_OFFSET + msg_offset + vect_offset,
 535                                                    vect_attr_len, ENC_NA);
 536
 537                 vect_attr_tree = proto_item_add_subtree(vect_attr_ti, ett_vect_attr);
 538
 539                 dissect_msrp_common2(vect_attr_tree, tvb, msg_offset + vect_offset);
 540
 541                 if(attribute_type == MSRP_ATTRIBUTE_TYPE_DOMAIN) {
 542                     /* MSRP Domain FirstValue is a group of fields
 543                      *
 544                      * Contains SRclassID (1 byte)
 545                      *        + SRclassPriority (1 byte)
 546                      *        + SRclassVID (2 bytes)
 547                      *        bytes of data
 548                      */
 549                     first_value_ti = proto_tree_add_item(vect_attr_tree, hf_msrp_first_value, tvb,
 550                                                          MSRP_FIRST_VALUE_GROUP_OFFSET + msg_offset + vect_offset,
 551                                                          attribute_length, ENC_NA);
 552                     first_value_tree = proto_item_add_subtree(first_value_ti, ett_first_value);
 553
 554                     /* Add Domain components to First Value tree */
 555                     proto_tree_add_item(first_value_tree, hf_msrp_sr_class_id, tvb,
 556                                         MSRP_FIRST_VALUE_GROUP_OFFSET + msg_offset + vect_offset, 1, ENC_BIG_ENDIAN);
 557                     proto_tree_add_item(first_value_tree, hf_msrp_sr_class_priority, tvb,
 558                                         MSRP_FIRST_VALUE_GROUP_OFFSET + msg_offset + vect_offset + 1, 1, ENC_BIG_ENDIAN);
 559                     proto_tree_add_item(first_value_tree, hf_msrp_sr_class_vid, tvb,
 560                                         MSRP_FIRST_VALUE_GROUP_OFFSET + msg_offset + vect_offset + 2, 2, ENC_BIG_ENDIAN);
 561
 562                     /* Decode three packed events. */
 563                     offset = dissect_msrp_three_packed_event(vect_attr_tree, tvb,
 564                                                              MSRP_DOMAIN_THREE_PACKED_OFFSET + msg_offset + vect_offset,
 565                                                              number_of_values);
 566
 567                 }
 568                 else {
 569                     /* MSRP Stream Reservations FirstValue is a group of fields
 570                      *
 571                      * Contains StreamID (8 bytes)
 572                      *        + DataFrameParameters (8 bytes on Talker attributes)
 573                      *        + TSpec (8 bytes on Talker attributes)
 574                      *        + PriorityAndRank (1 byte on Talker attributes)
 575                      *        + AccumulatedLatency (4 bytes on Talker attributes)
 576                      *        + FailureInformation (9 bytes on Talker Failed attributes)
 577                      *        bytes of data
 578                      */
 579                     first_value_ti = proto_tree_add_item(vect_attr_tree, hf_msrp_first_value, tvb,
 580                                                          MSRP_FIRST_VALUE_GROUP_OFFSET + msg_offset + vect_offset,
 581                                                          attribute_length, ENC_NA);
 582                     first_value_tree = proto_item_add_subtree(first_value_ti, ett_first_value);
 583
 584                     /* Decode StreamID */
 585                     proto_tree_add_item(first_value_tree, hf_msrp_stream_id, tvb,
 586                                         MSRP_STREAM_ID_OFFSET + msg_offset + vect_offset, 8, ENC_BIG_ENDIAN);
 587
 588                     switch ( attribute_type ) {
 589                     case MSRP_ATTRIBUTE_TYPE_LISTENER:
 590                         offset = dissect_msrp_three_packed_event(vect_attr_tree, tvb,
 591                                                                  MSRP_LISTENER_THREE_PACKED_OFFSET + msg_offset + vect_offset,
 592                                                                  number_of_values);
 593                         offset = dissect_msrp_four_packed_event(vect_attr_tree, tvb, offset, number_of_values);
 594                         break;
 595                     case MSRP_ATTRIBUTE_TYPE_TALKER_ADVERTISE:
 596                         dissect_msrp_talker_common(first_value_tree, tvb, msg_offset + vect_offset);
 597                         offset = dissect_msrp_three_packed_event(vect_attr_tree, tvb,
 598                                                                  MSRP_TALKER_ADVERTISE_THREE_PACKED_OFFSET + msg_offset + vect_offset,
 599                                                                  number_of_values);
 600                         break;
 601                     case MSRP_ATTRIBUTE_TYPE_TALKER_FAILED:
 602                         dissect_msrp_talker_common(first_value_tree, tvb, msg_offset + vect_offset);
 603                         dissect_msrp_talker_failed(first_value_tree, tvb, msg_offset + vect_offset);
 604                         offset = dissect_msrp_three_packed_event(vect_attr_tree, tvb,
 605                                                                  MSRP_TALKER_FAILED_THREE_PACKED_OFFSET + msg_offset + vect_offset,
 606                                                                  number_of_values);
 607                         break;
 608                     default:
 609                         proto_tree_add_expert(first_value_tree, pinfo, &ei_msrp_attribute_type, tvb, msg_offset + vect_offset, vect_attr_len);
 610                         break;
 611                     }
 612                 }
 613                 vect_offset += vect_attr_len; /* Move to next Vector Attribute, if there is one */
 614             } /* Multiple VectorAttribute while() */
 615
 616             proto_tree_add_item(attr_list_tree, hf_msrp_end_mark, tvb, offset, 2, ENC_BIG_ENDIAN); /* VectorAttribute EndMark */
 617
 618             msg_offset += msg_length; /* Move to next Message, if there is one */
 619         } /* Multiple Message while() */
 620         proto_tree_add_item(msrp_tree, hf_msrp_end_mark, tvb, offset+2, 2, ENC_BIG_ENDIAN); /* Message EndMark */
 621     }
 622     return tvb_captured_length(tvb);
 623 }
 624
 625
 626 /* Register the protocol with Wireshark */
 627 void
 628 proto_register_mrp_msrp(void)
 629 {
 630     static hf_register_info hf[] = {
 631         { &hf_msrp_proto_id,
 632             { "Protocol Version",      "mrp-msrp.protocol_version",
 633               FT_UINT8,  BASE_DEC, NULL, 0x0, NULL, HFILL }
 634         },
 635         { &hf_msrp_message, /* Message is a group of fields */
 636             { "Message",               "mrp-msrp.message",
 637               FT_NONE,  BASE_NONE, NULL, 0x0, NULL, HFILL }
 638         },
 639         { &hf_msrp_attribute_type,
 640             { "Attribute Type",        "mrp-msrp.attribute_type",
 641               FT_UINT8,  BASE_DEC, VALS(attribute_type_vals), 0x0, NULL, HFILL }
 642         },
 643         { &hf_msrp_attribute_length,
 644             { "Attribute Length",      "mrp-msrp.attribute_length",
 645               FT_UINT8,  BASE_DEC, NULL, 0x0, NULL, HFILL }
 646         },
 647         { &hf_msrp_attribute_list_length,
 648             { "Attribute List Length", "mrp-msrp.attribute_list_length",
 649               FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }
 650         },
 651         { &hf_msrp_attribute_list, /* AttributeList is a group of fields */
 652             { "Attribute List",        "mrp-msrp.attribute_list",
 653               FT_NONE,  BASE_NONE, NULL, 0x0, NULL, HFILL }
 654         },
 655         { &hf_msrp_vector_attribute, /* VectorAttribute is a group of fields */
 656             { "Vector Attribute",      "mrp-msrp.vector_attribute",
 657               FT_NONE,  BASE_NONE, NULL, 0x0, NULL, HFILL }
 658         },
 659         { &hf_msrp_vector_header,
 660             { "Vector Header",         "mrp-msrp.vector_header",
 661               FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }
 662         },
 663         { &hf_msrp_leave_all_event,
 664             { "Leave All Event",       "mrp-msrp.leave_all_event",
 665               FT_UINT16, BASE_DEC, VALS(leave_all_vals), MSRP_LEAVE_ALL_EVENT_MASK, NULL, HFILL }
 666         },
 667         { &hf_msrp_number_of_values,
 668             { "Number of Values",      "mrp-msrp.number_of_values",
 669               FT_UINT16, BASE_DEC, NULL, MSRP_NUMBER_OF_VALUES_MASK, NULL, HFILL }
 670         },
 671         { &hf_msrp_first_value, /* FirstValue is a group of fields */
 672             { "First Value",           "mrp-msrp.first_value",
 673               FT_NONE,  BASE_NONE, NULL, 0x0, NULL, HFILL }
 674         },
 675         { &hf_msrp_stream_id,
 676             { "Stream ID",             "mrp-msrp.stream_id",
 677               FT_UINT64, BASE_HEX, NULL, 0x00, NULL, HFILL }
 678         },
 679         { &hf_msrp_stream_da,
 680             { "Stream DA",             "mrp-msrp.stream_da",
 681               FT_ETHER,  BASE_NONE, NULL, 0x00, NULL, HFILL }
 682         },
 683         { &hf_msrp_vlan_id,
 684             { "VLAN ID",               "mrp-msrp.vlan_id",
 685               FT_UINT16, BASE_HEX, NULL, 0x00, NULL, HFILL }
 686         },
 687         { &hf_msrp_tspec_max_frame_size,
 688             { "TSpec Max Frame Size",  "mrp-msrp.tspec_max_frame_size",
 689               FT_UINT16, BASE_DEC, NULL, 0x00, NULL, HFILL }
 690         },
 691         { &hf_msrp_tspec_max_interval_frames,
 692             { "TSpec Max Frame Interval", "mrp-msrp.tspec_max_interval_frames",
 693               FT_UINT16, BASE_DEC, NULL, 0x00, NULL, HFILL }
 694         },
 695         { &hf_msrp_priority_and_rank,
 696             { "Priority and Rank",     "mrp-msrp.priority_and_rank",
 697               FT_UINT8,  BASE_HEX, NULL, 0x0, NULL, HFILL }
 698         },
 699         { &hf_msrp_priority,
 700             { "Priority",              "mrp-msrp.priority",
 701               FT_UINT8,  BASE_DEC, VALS(priority_vals), MSRP_PRIORITY_MASK, NULL, HFILL }
 702         },
 703         { &hf_msrp_rank,
 704             { "Rank",                  "mrp-msrp.rank",
 705               FT_UINT8,  BASE_DEC, VALS(rank_vals), MSRP_RANK_MASK, NULL, HFILL }
 706         },
 707         { &hf_msrp_reserved,
 708             { "Reserved",              "mrp-msrp.reserved",
 709               FT_UINT8,  BASE_DEC, VALS(reserved_vals), MSRP_RESERVED_MASK, NULL, HFILL }
 710         },
 711         { &hf_msrp_accumulated_latency,
 712             { "Accumulated Latency",   "mrp-msrp.accumulated_latency",
 713               FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
 714         },
 715         { &hf_msrp_failure_bridge_id,
 716             { "Failure Bridge ID",     "mrp-msrp.failure_bridge_id",
 717               FT_UINT64, BASE_HEX, NULL, 0x0, NULL, HFILL }
 718         },
 719         { &hf_msrp_failure_code,
 720             { "Failure Code",          "mrp-msrp.failure_code",
 721               FT_UINT8, BASE_DEC,  VALS(failure_vals), 0x0, NULL, HFILL }
 722         },
 723         { &hf_msrp_sr_class_id,
 724             { "SR Class ID",           "mrp-msrp.sr_class_id",
 725               FT_UINT8, BASE_DEC,  VALS(sr_class_vals), 0x0, NULL, HFILL }
 726         },
 727         { &hf_msrp_sr_class_priority,
 728             { "SR Class Priority",     "mrp-msrp.sr_class_priority",
 729               FT_UINT8, BASE_DEC,  NULL, 0x0, NULL, HFILL }
 730         },
 731         { &hf_msrp_sr_class_vid,
 732             { "SR Class VID",          "mrp-msrp.sr_class_vid",
 733               FT_UINT16, BASE_DEC,  NULL, 0x0, NULL, HFILL }
 734         },
 735         { &hf_msrp_three_packed_event,
 736             { "Attribute Event",       "mrp-msrp.three_packed_event",
 737               FT_UINT8, BASE_DEC,  VALS(three_packed_vals), 0x0, NULL, HFILL }
 738         },
 739         { &hf_msrp_four_packed_event,
 740             { "Declaration Type",      "mrp-msrp.four_packed_event",
 741               FT_UINT8, BASE_DEC,  VALS(four_packed_vals), 0x0, NULL, HFILL }
 742         },
 743         { &hf_msrp_end_mark,
 744             { "End Mark",              "mrp-msrp.end_mark",
 745               FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }
 746         },
 747     };
 748
 749     /* Setup protocol subtree array */
 750     static int *ett[] = {
 751         &ett_msrp,
 752         &ett_msg,
 753         &ett_attr_list,
 754         &ett_vect_attr,
 755         &ett_vector_header,
 756         &ett_first_value,
 757         &ett_priority_and_rank
 758     };
 759
 760     static ei_register_info ei[] = {
 761         { &ei_msrp_attribute_type, { "mrp-msrp.attribute_type.unknown", PI_PROTOCOL, PI_WARN, "Malformed TCP/IP Status", EXPFILL }},
 762     };
 763
 764     expert_module_t* expert_msrp;
 765
 766     /* Register the protocol name and description */
 767     proto_msrp = proto_register_protocol("Multiple Stream Reservation Protocol",
 768                                          "MRP-MSRP", "mrp-msrp");
 769
 770     /* Required function calls to register the header fields and subtrees used */
 771     proto_register_field_array(proto_msrp, hf, array_length(hf));
 772     proto_register_subtree_array(ett, array_length(ett));
 773     expert_msrp = expert_register_protocol(proto_msrp);
 774     expert_register_field_array(expert_msrp, ei, array_length(ei));
 775
 776     /* Register the dissector */
 777     msrp_handle = register_dissector("mrp-msrp", dissect_msrp, proto_msrp);
 778 }
 779
 780 void
 781 proto_reg_handoff_mrp_msrp(void)
 782 {
 783     dissector_add_uint("ethertype", ETHERTYPE_MSRP, msrp_handle);
 784 }
 785
 786 /*
 787  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 788  *
 789  * Local variables:
 790  * c-basic-offset: 4
 791  * tab-width: 8
 792  * indent-tabs-mode: nil
 793  * End:
 794  *
 795  * vi: set shiftwidth=4 tabstop=8 expandtab:
 796  * :indentSize=4:tabSize=8:noTabs=true:
 797  */