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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 20:34:10 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 20:34:10 +0000 |
commit | e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc (patch) | |
tree | 68cb5ef9081156392f1dd62a00c6ccc1451b93df /epan/dissectors/packet-mrp-msrp.c | |
parent | Initial commit. (diff) | |
download | wireshark-e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc.tar.xz wireshark-e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc.zip |
Adding upstream version 4.2.2.upstream/4.2.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'epan/dissectors/packet-mrp-msrp.c')
-rw-r--r-- | epan/dissectors/packet-mrp-msrp.c | 797 |
1 files changed, 797 insertions, 0 deletions
diff --git a/epan/dissectors/packet-mrp-msrp.c b/epan/dissectors/packet-mrp-msrp.c new file mode 100644 index 00000000..fec4e46c --- /dev/null +++ b/epan/dissectors/packet-mrp-msrp.c @@ -0,0 +1,797 @@ +/* packet-mrp_msrp.c + * Routines for MSRP (MRP Multiple Stream Reservation Protocol) dissection + * Copyright 2010, Torrey Atcitty <tatcitty@harman.com> + * Craig Gunther <craig.gunther@harman.com> + * + * Based on the code from packet-mmrp.c (MMRP) from + * Markus Seehofer <mseehofe@nt.hirschmann.de> Copyright 2001 + * + * Wireshark - Network traffic analyzer + * By Gerald Combs <gerald@wireshark.org> + * Copyright 1998 Gerald Combs + * + * SPDX-License-Identifier: GPL-2.0-or-later + * + * The MSRP Protocol specification can be found at the following: + * http://www.ieee802.org/1/files/private/at-drafts/d6/802-1at-d6-0.pdf + * + */ + +#include "config.h" + +#include <epan/packet.h> +#include <epan/expert.h> +#include <epan/etypes.h> + +void proto_register_mrp_msrp(void); +void proto_reg_handoff_mrp_msrp(void); + +static dissector_handle_t msrp_handle; + +/* MSRP End Mark Sequence */ +#define MSRP_END_MARK 0x0000 + +/**********************************************************/ +/* Offsets of fields within an MSRP packet */ +/**********************************************************/ +#define MSRP_PROTOCOL_VERSION_OFFSET 0 + +/* Next comes the MSRP Message group */ +#define MSRP_MESSAGE_GROUP_OFFSET (MSRP_PROTOCOL_VERSION_OFFSET + 1) /* Message is a group of fields */ +#define MSRP_ATTRIBUTE_TYPE_OFFSET (MSRP_MESSAGE_GROUP_OFFSET) +#define MSRP_ATTRIBUTE_LENGTH_OFFSET (MSRP_ATTRIBUTE_TYPE_OFFSET + 1) +#define MSRP_ATTRIBUTE_LIST_LENGTH_OFFSET (MSRP_ATTRIBUTE_LENGTH_OFFSET + 1) + +/* Next comes the MSRP AttributeList group */ +#define MSRP_ATTRIBUTE_LIST_GROUP_OFFSET (MSRP_ATTRIBUTE_LIST_LENGTH_OFFSET + 2) /* AttributeList is a group of fields */ + +/* Next comes the MSRP VectorAttribute group */ +#define MSRP_VECTOR_ATTRIBUTE_GROUP_OFFSET (MSRP_ATTRIBUTE_LIST_GROUP_OFFSET) /* VectorAttribute is a group of fields */ +#define MSRP_VECTOR_HEADER_OFFSET (MSRP_VECTOR_ATTRIBUTE_GROUP_OFFSET) /* contains the following two fields */ +#define MSRP_LEAVE_ALL_EVENT_OFFSET (MSRP_VECTOR_HEADER_OFFSET) +#define MSRP_LEAVE_ALL_EVENT_MASK 0xE000 +#define MSRP_NUMBER_OF_VALUES_OFFSET (MSRP_VECTOR_HEADER_OFFSET) +#define MSRP_NUMBER_OF_VALUES_MASK 0x1fff + +/* Next comes the MSRP FirstValue group */ +#define MSRP_FIRST_VALUE_GROUP_OFFSET (MSRP_VECTOR_HEADER_OFFSET + 2) /* FirstValue is a group of fields */ +#define MSRP_STREAM_ID_OFFSET (MSRP_FIRST_VALUE_GROUP_OFFSET) +#define MSRP_STREAM_DA_OFFSET (MSRP_STREAM_ID_OFFSET + 8) +#define MSRP_VLAN_ID_OFFSET (MSRP_STREAM_DA_OFFSET + 6) +#define MSRP_TSPEC_MAX_FRAME_SIZE_OFFSET (MSRP_VLAN_ID_OFFSET + 2) +#define MSRP_TSPEC_MAX_INTERVAL_FRAMES_OFFSET (MSRP_TSPEC_MAX_FRAME_SIZE_OFFSET + 2) +#define MSRP_PRIORITY_AND_RANK_OFFSET (MSRP_TSPEC_MAX_INTERVAL_FRAMES_OFFSET + 2) /* contains the following two fields */ +#define MSRP_PRIORITY_OFFSET (MSRP_PRIORITY_AND_RANK_OFFSET) +#define MSRP_PRIORITY_MASK 0xe0 +#define MSRP_RANK_OFFSET (MSRP_PRIORITY_AND_RANK_OFFSET) +#define MSRP_RANK_MASK 0x10 +#define MSRP_RESERVED_OFFSET (MSRP_PRIORITY_AND_RANK_OFFSET) +#define MSRP_RESERVED_MASK 0x0F +#define MSRP_ACCUMULATED_LATENCY_OFFSET (MSRP_PRIORITY_AND_RANK_OFFSET + 1) +#define MSRP_FAILURE_BRIDGE_ID_OFFSET (MSRP_ACCUMULATED_LATENCY_OFFSET + 4) +#define MSRP_FAILURE_CODE_OFFSET (MSRP_FAILURE_BRIDGE_ID_OFFSET + 8) + +#define MSRP_DOMAIN_THREE_PACKED_OFFSET (MSRP_FIRST_VALUE_GROUP_OFFSET + 4) +#define MSRP_LISTENER_THREE_PACKED_OFFSET (MSRP_STREAM_ID_OFFSET + 8) +#define MSRP_TALKER_ADVERTISE_THREE_PACKED_OFFSET (MSRP_ACCUMULATED_LATENCY_OFFSET + 4) +#define MSRP_TALKER_FAILED_THREE_PACKED_OFFSET (MSRP_FAILURE_CODE_OFFSET + 1) + +/**********************************************************/ +/* Valid field contents */ +/**********************************************************/ + +/* Attribute Type definitions */ +#define MSRP_ATTRIBUTE_TYPE_TALKER_ADVERTISE 0x01 +#define MSRP_ATTRIBUTE_TYPE_TALKER_FAILED 0x02 +#define MSRP_ATTRIBUTE_TYPE_LISTENER 0x03 +#define MSRP_ATTRIBUTE_TYPE_DOMAIN 0x04 +static const value_string attribute_type_vals[] = { + { MSRP_ATTRIBUTE_TYPE_TALKER_ADVERTISE, "Talker Advertise" }, + { MSRP_ATTRIBUTE_TYPE_TALKER_FAILED, "Talker Failed" }, + { MSRP_ATTRIBUTE_TYPE_LISTENER, "Listener" }, + { MSRP_ATTRIBUTE_TYPE_DOMAIN, "Domain" }, + { 0, NULL } +}; + +/* Leave All Event definitions */ +#define MSRP_NULLLEAVEALL 0 +#define MSRP_LEAVEALL 1 +static const value_string leave_all_vals[] = { + { MSRP_NULLLEAVEALL, "Null" }, + { MSRP_LEAVEALL, "Leave All" }, + { 0, NULL } +}; + +/* Priority definitions */ + #define MSRP_TRAFFIC_CLASS_A 3 + #define MSRP_TRAFFIC_CLASS_B 2 + +static const value_string priority_vals[] = { + { MSRP_TRAFFIC_CLASS_A, "Traffic Class A" }, + { MSRP_TRAFFIC_CLASS_B, "Traffic Class B" }, + { 0, NULL } +}; + +/* Rank definitions */ +static const value_string rank_vals[] = { + { 0, "Emergency" }, + { 1, "Non-emergency" }, + { 0, NULL } +}; +static const value_string reserved_vals[] = { + { 0, "Reserved-0" }, + { 1, "Reserved-1" }, + { 2, "Reserved-2" }, + { 3, "Reserved-3" }, + { 4, "Reserved-4" }, + { 5, "Reserved-5" }, + { 6, "Reserved-6" }, + { 7, "Reserved-7" }, + { 8, "Reserved-8" }, + { 9, "Reserved-9" }, + { 10, "Reserved-10" }, + { 11, "Reserved-11" }, + { 12, "Reserved-12" }, + { 13, "Reserved-13" }, + { 14, "Reserved-14" }, + { 15, "Reserved-15" }, + { 0, NULL } +}; + +/* Failure Code definitions */ +static const value_string failure_vals[] = { + { 1, "Insufficient Bandwidth" }, + { 2, "Insufficient Bridge resources" }, + { 3, "Insufficient Bandwidth for Traffic Class" }, + { 4, "Stream ID in use by another Talker" }, + { 5, "Stream destination_address already in use" }, + { 6, "Stream preempted by higher rank" }, + { 7, "Reported latency has changed" }, + { 8, "Egress port in not AVB capable" }, + { 9, "Use a different destination address (i.e. MAC DA hash table full)" }, + { 10, "Out of MSRP resources" }, + { 11, "Out of MMRP resources" }, + { 12, "Cannot store destination_address (i.e. Bridge is out of MAC resources)" }, + { 13, "Requested priority not an SR Class (3.3) priority" }, + { 14, "MaxFrameSize (35.2.2.8.4(a)) is too large for media" }, + { 15, "msrpMaxFanInPorts (35.2.1.4(f)) limit has been reached" }, + { 16, "Changes in FirstValue for a registered StreamID" }, + { 17, "VLAN is blocked on this egress port (Registration Forbidden)" }, + { 18, "VLAN tagging is disabled on this egress port (untagged set)" }, + { 19, "SR class priority mismatch" }, + { 0, NULL } +}; + +/* SR class ID definitions */ + #define MSRP_SR_CLASS_A 6 + #define MSRP_SR_CLASS_B 5 + #define MSRP_SR_CLASS_C 4 + #define MSRP_SR_CLASS_D 3 + #define MSRP_SR_CLASS_E 2 + #define MSRP_SR_CLASS_F 1 + #define MSRP_SR_CLASS_G 0 + +static const value_string sr_class_vals[] = { + { MSRP_SR_CLASS_A, "SR Class A" }, + { MSRP_SR_CLASS_B, "SR Class B" }, + { MSRP_SR_CLASS_C, "SR Class C" }, + { MSRP_SR_CLASS_D, "SR Class D" }, + { MSRP_SR_CLASS_E, "SR Class E" }, + { MSRP_SR_CLASS_F, "SR Class F" }, + { MSRP_SR_CLASS_G, "SR Class G" }, + { 0, NULL } +}; + +/* Three Packed Event definitions */ +static const value_string three_packed_vals[] = { + { 0, "New" }, + { 1, "JoinIn" }, + { 2, "In" }, + { 3, "JoinMt" }, + { 4, "Mt" }, + { 5, "Lv" }, + { 0, NULL } +}; + +/* Four Packed Event definitions */ +static const value_string four_packed_vals[] = { + { 0, "Ignore" }, + { 1, "Asking Failed" }, + { 2, "Ready" }, + { 3, "Ready Failed" }, + { 0, NULL } +}; + +/**********************************************************/ +/* Initialize the protocol and registered fields */ +/**********************************************************/ +static int proto_msrp = -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)); + + /* 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: + */ |