/* packet-mrp_msrp.c * Routines for MSRP (MRP Multiple Stream Reservation Protocol) dissection * Copyright 2010, Torrey Atcitty * Craig Gunther * * Based on the code from packet-mmrp.c (MMRP) from * Markus Seehofer Copyright 2001 * * Wireshark - Network traffic analyzer * By Gerald Combs * 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 #include #include void proto_register_mrp_msrp(void); void proto_reg_handoff_mrp_msrp(void); static dissector_handle_t msrp_handle; /* MSRP End Mark Sequence */ #define MSRP_END_MARK 0x0000 /**********************************************************/ /* Offsets of fields within an MSRP packet */ /**********************************************************/ #define MSRP_PROTOCOL_VERSION_OFFSET 0 /* Next comes the MSRP Message group */ #define MSRP_MESSAGE_GROUP_OFFSET (MSRP_PROTOCOL_VERSION_OFFSET + 1) /* Message is a group of fields */ #define MSRP_ATTRIBUTE_TYPE_OFFSET (MSRP_MESSAGE_GROUP_OFFSET) #define MSRP_ATTRIBUTE_LENGTH_OFFSET (MSRP_ATTRIBUTE_TYPE_OFFSET + 1) #define MSRP_ATTRIBUTE_LIST_LENGTH_OFFSET (MSRP_ATTRIBUTE_LENGTH_OFFSET + 1) /* Next comes the MSRP AttributeList group */ #define MSRP_ATTRIBUTE_LIST_GROUP_OFFSET (MSRP_ATTRIBUTE_LIST_LENGTH_OFFSET + 2) /* AttributeList is a group of fields */ /* Next comes the MSRP VectorAttribute group */ #define MSRP_VECTOR_ATTRIBUTE_GROUP_OFFSET (MSRP_ATTRIBUTE_LIST_GROUP_OFFSET) /* VectorAttribute is a group of fields */ #define MSRP_VECTOR_HEADER_OFFSET (MSRP_VECTOR_ATTRIBUTE_GROUP_OFFSET) /* contains the following two fields */ #define MSRP_LEAVE_ALL_EVENT_OFFSET (MSRP_VECTOR_HEADER_OFFSET) #define MSRP_LEAVE_ALL_EVENT_MASK 0xE000 #define MSRP_NUMBER_OF_VALUES_OFFSET (MSRP_VECTOR_HEADER_OFFSET) #define MSRP_NUMBER_OF_VALUES_MASK 0x1fff /* Next comes the MSRP FirstValue group */ #define MSRP_FIRST_VALUE_GROUP_OFFSET (MSRP_VECTOR_HEADER_OFFSET + 2) /* FirstValue is a group of fields */ #define MSRP_STREAM_ID_OFFSET (MSRP_FIRST_VALUE_GROUP_OFFSET) #define MSRP_STREAM_DA_OFFSET (MSRP_STREAM_ID_OFFSET + 8) #define MSRP_VLAN_ID_OFFSET (MSRP_STREAM_DA_OFFSET + 6) #define MSRP_TSPEC_MAX_FRAME_SIZE_OFFSET (MSRP_VLAN_ID_OFFSET + 2) #define MSRP_TSPEC_MAX_INTERVAL_FRAMES_OFFSET (MSRP_TSPEC_MAX_FRAME_SIZE_OFFSET + 2) #define MSRP_PRIORITY_AND_RANK_OFFSET (MSRP_TSPEC_MAX_INTERVAL_FRAMES_OFFSET + 2) /* contains the following two fields */ #define MSRP_PRIORITY_OFFSET (MSRP_PRIORITY_AND_RANK_OFFSET) #define MSRP_PRIORITY_MASK 0xe0 #define MSRP_RANK_OFFSET (MSRP_PRIORITY_AND_RANK_OFFSET) #define MSRP_RANK_MASK 0x10 #define MSRP_RESERVED_OFFSET (MSRP_PRIORITY_AND_RANK_OFFSET) #define MSRP_RESERVED_MASK 0x0F #define MSRP_ACCUMULATED_LATENCY_OFFSET (MSRP_PRIORITY_AND_RANK_OFFSET + 1) #define MSRP_FAILURE_BRIDGE_ID_OFFSET (MSRP_ACCUMULATED_LATENCY_OFFSET + 4) #define MSRP_FAILURE_CODE_OFFSET (MSRP_FAILURE_BRIDGE_ID_OFFSET + 8) #define MSRP_DOMAIN_THREE_PACKED_OFFSET (MSRP_FIRST_VALUE_GROUP_OFFSET + 4) #define MSRP_LISTENER_THREE_PACKED_OFFSET (MSRP_STREAM_ID_OFFSET + 8) #define MSRP_TALKER_ADVERTISE_THREE_PACKED_OFFSET (MSRP_ACCUMULATED_LATENCY_OFFSET + 4) #define MSRP_TALKER_FAILED_THREE_PACKED_OFFSET (MSRP_FAILURE_CODE_OFFSET + 1) /**********************************************************/ /* Valid field contents */ /**********************************************************/ /* Attribute Type definitions */ #define MSRP_ATTRIBUTE_TYPE_TALKER_ADVERTISE 0x01 #define MSRP_ATTRIBUTE_TYPE_TALKER_FAILED 0x02 #define MSRP_ATTRIBUTE_TYPE_LISTENER 0x03 #define MSRP_ATTRIBUTE_TYPE_DOMAIN 0x04 static const value_string attribute_type_vals[] = { { MSRP_ATTRIBUTE_TYPE_TALKER_ADVERTISE, "Talker Advertise" }, { MSRP_ATTRIBUTE_TYPE_TALKER_FAILED, "Talker Failed" }, { MSRP_ATTRIBUTE_TYPE_LISTENER, "Listener" }, { MSRP_ATTRIBUTE_TYPE_DOMAIN, "Domain" }, { 0, NULL } }; /* Leave All Event definitions */ #define MSRP_NULLLEAVEALL 0 #define MSRP_LEAVEALL 1 static const value_string leave_all_vals[] = { { MSRP_NULLLEAVEALL, "Null" }, { MSRP_LEAVEALL, "Leave All" }, { 0, NULL } }; /* Priority definitions */ #define MSRP_TRAFFIC_CLASS_A 3 #define MSRP_TRAFFIC_CLASS_B 2 static const value_string priority_vals[] = { { MSRP_TRAFFIC_CLASS_A, "Traffic Class A" }, { MSRP_TRAFFIC_CLASS_B, "Traffic Class B" }, { 0, NULL } }; /* Rank definitions */ static const value_string rank_vals[] = { { 0, "Emergency" }, { 1, "Non-emergency" }, { 0, NULL } }; static const value_string reserved_vals[] = { { 0, "Reserved-0" }, { 1, "Reserved-1" }, { 2, "Reserved-2" }, { 3, "Reserved-3" }, { 4, "Reserved-4" }, { 5, "Reserved-5" }, { 6, "Reserved-6" }, { 7, "Reserved-7" }, { 8, "Reserved-8" }, { 9, "Reserved-9" }, { 10, "Reserved-10" }, { 11, "Reserved-11" }, { 12, "Reserved-12" }, { 13, "Reserved-13" }, { 14, "Reserved-14" }, { 15, "Reserved-15" }, { 0, NULL } }; /* Failure Code definitions */ static const value_string failure_vals[] = { { 1, "Insufficient Bandwidth" }, { 2, "Insufficient Bridge resources" }, { 3, "Insufficient Bandwidth for Traffic Class" }, { 4, "Stream ID in use by another Talker" }, { 5, "Stream destination_address already in use" }, { 6, "Stream preempted by higher rank" }, { 7, "Reported latency has changed" }, { 8, "Egress port in not AVB capable" }, { 9, "Use a different destination address (i.e. MAC DA hash table full)" }, { 10, "Out of MSRP resources" }, { 11, "Out of MMRP resources" }, { 12, "Cannot store destination_address (i.e. Bridge is out of MAC resources)" }, { 13, "Requested priority not an SR Class (3.3) priority" }, { 14, "MaxFrameSize (35.2.2.8.4(a)) is too large for media" }, { 15, "msrpMaxFanInPorts (35.2.1.4(f)) limit has been reached" }, { 16, "Changes in FirstValue for a registered StreamID" }, { 17, "VLAN is blocked on this egress port (Registration Forbidden)" }, { 18, "VLAN tagging is disabled on this egress port (untagged set)" }, { 19, "SR class priority mismatch" }, { 0, NULL } }; /* SR class ID definitions */ #define MSRP_SR_CLASS_A 6 #define MSRP_SR_CLASS_B 5 #define MSRP_SR_CLASS_C 4 #define MSRP_SR_CLASS_D 3 #define MSRP_SR_CLASS_E 2 #define MSRP_SR_CLASS_F 1 #define MSRP_SR_CLASS_G 0 static const value_string sr_class_vals[] = { { MSRP_SR_CLASS_A, "SR Class A" }, { MSRP_SR_CLASS_B, "SR Class B" }, { MSRP_SR_CLASS_C, "SR Class C" }, { MSRP_SR_CLASS_D, "SR Class D" }, { MSRP_SR_CLASS_E, "SR Class E" }, { MSRP_SR_CLASS_F, "SR Class F" }, { MSRP_SR_CLASS_G, "SR Class G" }, { 0, NULL } }; /* Three Packed Event definitions */ static const value_string three_packed_vals[] = { { 0, "New" }, { 1, "JoinIn" }, { 2, "In" }, { 3, "JoinMt" }, { 4, "Mt" }, { 5, "Lv" }, { 0, NULL } }; /* Four Packed Event definitions */ static const value_string four_packed_vals[] = { { 0, "Ignore" }, { 1, "Asking Failed" }, { 2, "Ready" }, { 3, "Ready Failed" }, { 0, NULL } }; /**********************************************************/ /* Initialize the protocol and registered fields */ /**********************************************************/ static int proto_msrp = -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, ""), 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)); /* Register the dissector */ msrp_handle = register_dissector("mrp-msrp", dissect_msrp, proto_msrp); } void proto_reg_handoff_mrp_msrp(void) { dissector_add_uint("ethertype", ETHERTYPE_MSRP, msrp_handle); } /* * Editor modelines - https://www.wireshark.org/tools/modelines.html * * Local variables: * c-basic-offset: 4 * tab-width: 8 * indent-tabs-mode: nil * End: * * vi: set shiftwidth=4 tabstop=8 expandtab: * :indentSize=4:tabSize=8:noTabs=true: */