forked from osmocom/wireshark
![Dario Lombardo](/assets/img/avatar_default.png)
Change-Id: I92c94448e6641716d03158a5f332c8b53709423a Reviewed-on: https://code.wireshark.org/review/25756 Petri-Dish: Dario Lombardo <lomato@gmail.com> Reviewed-by: Anders Broman <a.broman58@gmail.com>
433 lines
18 KiB
C
433 lines
18 KiB
C
/* packet-mrp_mmrp.c
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* Routines for MMRP (MRP Multiple Mac Registration Protocol) dissection
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* Copyright 2011, Johannes Jochen <johannes.jochen[AT]belden.com>
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*
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*
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* Based on the code from packet-mrp-msrp.c (MSRP) from
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* Torrey Atcitty <tatcitty[AT]harman.com> and Craig Gunther <craig.gunther[AT]harman.com>
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* Copyright 2010
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald[AT]wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*
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* The MMRP Protocol specification can be found at the following:
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* http://standards.ieee.org/about/get/802/802.1.html
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*
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/etypes.h>
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void proto_register_mrp_mmrp(void);
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void proto_reg_handoff_mrp_mmrp(void);
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/* MMRP End Mark Sequence */
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#define MMRP_END_MARK 0x0000
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/**********************************************************/
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/* Offsets of fields within an MMRP packet */
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/**********************************************************/
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#define MMRP_PROTOCOL_VERSION_OFFSET 0
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/* Next comes the MMRP Message group */
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#define MMRP_MESSAGE_GROUP_OFFSET (MMRP_PROTOCOL_VERSION_OFFSET + 1) /* Message is a group of fields */
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#define MMRP_ATTRIBUTE_TYPE_OFFSET (MMRP_MESSAGE_GROUP_OFFSET)
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#define MMRP_ATTRIBUTE_LENGTH_OFFSET (MMRP_ATTRIBUTE_TYPE_OFFSET + 1)
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/* Next comes the MMRP AttributeList group */
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#define MMRP_ATTRIBUTE_LIST_GROUP_OFFSET (MMRP_ATTRIBUTE_LENGTH_OFFSET + 1) /* AttributeList is a group of fields */
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/* Next comes the MMRP VectorAttribute group */
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#define MMRP_VECTOR_ATTRIBUTE_GROUP_OFFSET (MMRP_ATTRIBUTE_LIST_GROUP_OFFSET) /* VectorAttribute is a group of fields */
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#define MMRP_VECTOR_HEADER_OFFSET (MMRP_VECTOR_ATTRIBUTE_GROUP_OFFSET) /* contains the following two fields */
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#define MMRP_LEAVE_ALL_EVENT_OFFSET (MMRP_VECTOR_HEADER_OFFSET)
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#define MMRP_LEAVE_ALL_EVENT_MASK 0xE000
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#define MMRP_NUMBER_OF_VALUES_OFFSET (MMRP_VECTOR_HEADER_OFFSET)
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#define MMRP_NUMBER_OF_VALUES_MASK 0x1fff
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/* Next comes the MMRP FirstValue group */
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#define MMRP_FIRST_VALUE_GROUP_OFFSET (MMRP_VECTOR_HEADER_OFFSET + 2) /* FirstValue is a group of fields */
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#define MMRP_SERVICE_THREE_PACKED_OFFSET (MMRP_FIRST_VALUE_GROUP_OFFSET + 1)
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#define MMRP_MAC_THREE_PACKED_OFFSET (MMRP_FIRST_VALUE_GROUP_OFFSET + 6)
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/**********************************************************/
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/* Valid field contents */
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/**********************************************************/
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/* Attribute Type definitions */
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#define MMRP_ATTRIBUTE_TYPE_SERVICE 0x01
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#define MMRP_ATTRIBUTE_TYPE_MAC 0x02
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static const value_string attribute_type_vals[] = {
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{ MMRP_ATTRIBUTE_TYPE_SERVICE, "Service Requirement" },
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{ MMRP_ATTRIBUTE_TYPE_MAC, "MAC" },
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{ 0, NULL }
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};
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/* Leave All Event definitions */
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#define MMRP_NULLLEAVEALL 0
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#define MMRP_LEAVEALL 1
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static const value_string leave_all_vals[] = {
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{ MMRP_NULLLEAVEALL, "Null" },
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{ MMRP_LEAVEALL, "Leave All" },
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{ 0, NULL }
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};
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/* Three Packed Event definitions */
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static const value_string three_packed_vals[] = {
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{ 0, "New" },
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{ 1, "JoinIn" },
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{ 2, "In" },
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{ 3, "JoinMt" },
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{ 4, "Mt" },
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{ 5, "Lv" },
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{ 0, NULL }
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};
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/**********************************************************/
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/* Initialize the protocol and registered fields */
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/**********************************************************/
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static int proto_mmrp = -1;
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static int hf_mmrp_proto_id = -1;
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static int hf_mmrp_message = -1; /* Message is a group of fields */
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static int hf_mmrp_attribute_type = -1;
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static int hf_mmrp_attribute_length = -1;
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static int hf_mmrp_attribute_list = -1; /* AttributeList is a group of fields */
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static int hf_mmrp_vector_attribute = -1; /* VectorAttribute is a group of fields */
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/* The following VectorHeader contains the LeaveAllEvent and NumberOfValues */
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static int hf_mmrp_vector_header = -1;
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static int hf_mmrp_leave_all_event = -1;
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static int hf_mmrp_number_of_values = -1;
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static gint ett_vector_header = -1;
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static const int *vector_header_fields[] = {
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&hf_mmrp_leave_all_event,
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&hf_mmrp_number_of_values,
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NULL
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};
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static int hf_mmrp_first_value = -1; /* FirstValue is a group of fields */
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static int hf_mmrp_three_packed_event = -1;
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static int hf_mmrp_end_mark = -1;
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/* Initialize the subtree pointers */
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static gint ett_mmrp = -1;
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static gint ett_msg = -1;
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static gint ett_attr_list = -1;
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static gint ett_vect_attr = -1;
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static gint ett_first_value = -1;
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/**********************************************************/
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/* Dissector starts here */
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/**********************************************************/
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/* dissect_mmrp_common1 (called from dissect_mmrp)
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*
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* dissect the following fields which are common to all MMRP attributes:
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* Attribute Type
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* Attribute Length
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* Attribute List Length
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*/
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static void
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dissect_mmrp_common1(proto_tree *msg_tree, tvbuff_t *tvb, int msg_offset)
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{
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proto_tree_add_item(msg_tree, hf_mmrp_attribute_type, tvb,
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MMRP_ATTRIBUTE_TYPE_OFFSET + msg_offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(msg_tree, hf_mmrp_attribute_length, tvb,
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MMRP_ATTRIBUTE_LENGTH_OFFSET + msg_offset, 1, ENC_BIG_ENDIAN);
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}
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/* dissect_mmrp_common2 (called from dissect_mmrp)
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*
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* dissect the following fields which are common to all MMRP attributes:
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* Leave All Event
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* Number of Values fields
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*/
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static void
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dissect_mmrp_common2(proto_tree *vect_attr_tree, tvbuff_t *tvb, int msg_offset)
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{
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proto_tree_add_bitmask(vect_attr_tree, tvb, MMRP_VECTOR_HEADER_OFFSET + msg_offset,
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hf_mmrp_vector_header, ett_vector_header, vector_header_fields, ENC_BIG_ENDIAN);
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}
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/* dissect_mmrp_three_packed_event (called from dissect_mmrp)
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*
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* dissect one or more ThreePackedEvents
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*/
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static guint
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dissect_mmrp_three_packed_event(proto_tree *vect_attr_tree, tvbuff_t *tvb, guint offset, guint16 number_of_values)
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{
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guint counter;
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for ( counter = 0; counter < number_of_values; ) {
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guint8 value;
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guint8 three_packed_event[3];
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value = tvb_get_guint8(tvb, offset);
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three_packed_event[0] = value / 36;
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value -= 36 * three_packed_event[0];
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three_packed_event[1] = value / 6;
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value -= 6 * three_packed_event[1];
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three_packed_event[2] = value;
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proto_tree_add_uint(vect_attr_tree, hf_mmrp_three_packed_event, tvb, offset, sizeof(guint8),
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three_packed_event[0]);
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counter++;
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if ( counter < number_of_values ) {
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proto_tree_add_uint(vect_attr_tree, hf_mmrp_three_packed_event, tvb, offset, sizeof(guint8),
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three_packed_event[1]);
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counter++;
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}
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if ( counter < number_of_values ) {
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proto_tree_add_uint(vect_attr_tree, hf_mmrp_three_packed_event, tvb, offset, sizeof(guint8),
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three_packed_event[2]);
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counter++;
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}
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offset++;
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}
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return( offset );
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}
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/* dissect_main
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*
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* main dissect function that calls the other functions listed above as necessary
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*/
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static int
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dissect_mmrp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) {
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/* Set up structures needed to add the protocol subtrees and manage them */
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proto_item *ti, *msg_ti, *attr_list_ti, *vect_attr_ti;
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proto_tree *mmrp_tree, *msg_tree, *attr_list_tree, *vect_attr_tree;
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/* Make entries in Protocol column and Info column on summary display */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "MRP-MMRP");
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col_set_str(pinfo->cinfo, COL_INFO, "Multiple Mac Registration Protocol");
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if (tree) {
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guint8 attribute_type;
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guint8 attribute_length;
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guint16 number_of_values;
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guint offset = 0;
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int vect_attr_len;
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int msg_offset; /* Use when handling multiple messages. This points to current msg being decoded. */
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int vect_offset; /* Use when handling multiple vector attributes. This points to the current vector attribute being decoded. */
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ti = proto_tree_add_item(tree, proto_mmrp, tvb, 0, -1, ENC_NA);
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mmrp_tree = proto_item_add_subtree(ti, ett_mmrp);
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proto_tree_add_item(mmrp_tree, hf_mmrp_proto_id, tvb, MMRP_PROTOCOL_VERSION_OFFSET, 1, ENC_BIG_ENDIAN);
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/* MMRP supports multiple MRP Messages per frame. Handle those Messages in
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* the following while() loop. You will know you are at the end of the list
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* of messages when the EndMark (0x0000) is encountered instead of an
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* Attribute Type and Attribute Length (guaranteed to not be 0x0000).
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*/
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msg_offset = 0;
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while (tvb_get_ntohs(tvb, MMRP_ATTRIBUTE_TYPE_OFFSET + msg_offset) != MMRP_END_MARK) {
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attribute_type = tvb_get_guint8(tvb, MMRP_ATTRIBUTE_TYPE_OFFSET + msg_offset);
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attribute_length = tvb_get_guint8(tvb, MMRP_ATTRIBUTE_LENGTH_OFFSET + msg_offset);
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/* MMRP Message is a group of fields
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*
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* Contains AttributeType (1 byte)
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* + AttributeLength (1 byte)
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* + AttributeList (AttributeListLength bytes)
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* bytes of data
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*/
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msg_ti = proto_tree_add_item(mmrp_tree, hf_mmrp_message, tvb,
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MMRP_MESSAGE_GROUP_OFFSET + msg_offset,
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-1, ENC_NA);
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msg_tree = proto_item_add_subtree(msg_ti, ett_msg);
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/* Append AttributeType description to the end of the "Message" heading */
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proto_item_append_text(msg_tree, ": %s (%d)",
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val_to_str_const(attribute_type, attribute_type_vals, "<Unknown>"),
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attribute_type);
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dissect_mmrp_common1(msg_tree, tvb, msg_offset);
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/* MMRP AttributeList is a group of fields
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*
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* Contains AttributeListLength bytes of data NOT
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*/
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attr_list_ti = proto_tree_add_item(msg_tree, hf_mmrp_attribute_list, tvb,
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MMRP_ATTRIBUTE_LIST_GROUP_OFFSET + msg_offset,
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-1, ENC_NA);
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attr_list_tree = proto_item_add_subtree(attr_list_ti, ett_attr_list);
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/* MMRP supports multiple MRP Vector Attributes per Attribute List. Handle those
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* Vector Attributes in the following while() loop. You will know you are at the
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* end of the list of Vector Attributes when the EndMark (0x0000) is encountered
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* instead of a Vector Header (guaranteed to not be 0x0000).
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*/
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vect_offset = 0;
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while (tvb_get_ntohs(tvb, MMRP_VECTOR_HEADER_OFFSET + msg_offset + vect_offset) != MMRP_END_MARK) {
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/* MMRP VectorAttribute is a group of fields
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*
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* Contains VectorHeader (2 bytes)
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* + FirstValue (AttributeLength bytes)
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* + VectorThreePacked (NumberOfValues @ 3/vector bytes)
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* + VectorFourPacked (NumberOfValues @ 4/vector bytes only for Listener attributes)
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* bytes of data
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*/
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number_of_values = tvb_get_ntohs(tvb, MMRP_NUMBER_OF_VALUES_OFFSET + msg_offset + vect_offset)
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& MMRP_NUMBER_OF_VALUES_MASK;
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vect_attr_len = 2 + attribute_length + (number_of_values + 2)/3; /* stores 3 values per byte */
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vect_attr_ti = proto_tree_add_item(attr_list_tree, hf_mmrp_vector_attribute, tvb,
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MMRP_VECTOR_ATTRIBUTE_GROUP_OFFSET + msg_offset + vect_offset,
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vect_attr_len, ENC_NA);
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vect_attr_tree = proto_item_add_subtree(vect_attr_ti, ett_vect_attr);
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dissect_mmrp_common2(vect_attr_tree, tvb, msg_offset + vect_offset);
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if (attribute_type == MMRP_ATTRIBUTE_TYPE_MAC) {
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/* MMRP FirstValue is a Mac Address*/
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proto_tree_add_item(vect_attr_tree, hf_mmrp_first_value, tvb,
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MMRP_FIRST_VALUE_GROUP_OFFSET + msg_offset + vect_offset,
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attribute_length, ENC_NA);
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/* Decode three packed events. */
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offset = dissect_mmrp_three_packed_event(vect_attr_tree, tvb,
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MMRP_MAC_THREE_PACKED_OFFSET + msg_offset + vect_offset,
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number_of_values);
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}
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else if (attribute_type == MMRP_ATTRIBUTE_TYPE_SERVICE) {
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/* MMRP Service Requirement*/
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proto_tree_add_item(vect_attr_tree, hf_mmrp_first_value, tvb,
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MMRP_FIRST_VALUE_GROUP_OFFSET + msg_offset + vect_offset,
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attribute_length, ENC_NA);
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offset = dissect_mmrp_three_packed_event(vect_attr_tree, tvb,
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MMRP_MAC_THREE_PACKED_OFFSET + msg_offset + vect_offset,
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number_of_values);
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}
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vect_offset += vect_attr_len; /* Move to next Vector Attribute, if there is one */
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} /* Multiple VectorAttribute while() */
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proto_tree_add_item(attr_list_tree, hf_mmrp_end_mark, tvb, offset, 2, ENC_BIG_ENDIAN); /* VectorAttribute EndMark */
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proto_item_set_len(attr_list_ti, vect_offset); /*without an endmark*/
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msg_offset += vect_offset + 2; /* + endmark; Move to next Message, if there is one */
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proto_item_set_len(msg_ti, vect_offset + 2); /*length of message*/
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} /* Multiple Message while() */
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proto_tree_add_item(mmrp_tree, hf_mmrp_end_mark, tvb, offset+2, 2, ENC_BIG_ENDIAN); /* Message EndMark */
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}
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return tvb_captured_length(tvb);
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}
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/* Register the protocol with Wireshark */
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void
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proto_register_mrp_mmrp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_mmrp_proto_id,
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{ "Protocol Version", "mrp-mmrp.protocol_version",
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FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }
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},
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{ &hf_mmrp_message, /* Message is a group of fields */
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{ "Message", "mrp-mmrp.message",
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FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL }
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},
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{ &hf_mmrp_attribute_type,
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{ "Attribute Type", "mrp-mmrp.attribute_type",
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FT_UINT8, BASE_DEC, VALS(attribute_type_vals), 0x0, NULL, HFILL }
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},
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{ &hf_mmrp_attribute_length,
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{ "Attribute Length", "mrp-mmrp.attribute_length",
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FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }
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},
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{ &hf_mmrp_attribute_list, /* AttributeList is a group of fields */
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{ "Attribute List", "mrp-mmrp.attribute_list",
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FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL }
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},
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{ &hf_mmrp_vector_attribute, /* VectorAttribute is a group of fields */
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{ "Vector Attribute", "mrp-mmrp.vector_attribute",
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FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL }
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},
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{ &hf_mmrp_vector_header,
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{ "Vector Header", "mrp-mmrp.vector_header",
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FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }
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},
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{ &hf_mmrp_leave_all_event,
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{ "Leave All Event", "mrp-mmrp.leave_all_event",
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FT_UINT16, BASE_DEC, VALS(leave_all_vals), MMRP_LEAVE_ALL_EVENT_MASK, NULL, HFILL }
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},
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{ &hf_mmrp_number_of_values,
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{ "Number of Values", "mrp-mmrp.number_of_values",
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FT_UINT16, BASE_DEC, NULL, MMRP_NUMBER_OF_VALUES_MASK, NULL, HFILL }
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},
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{ &hf_mmrp_first_value, /* FirstValue is a group of fields */
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{ "First Value", "mrp-mmrp.first_value",
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FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL }
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},
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{ &hf_mmrp_three_packed_event,
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{ "Attribute Event", "mrp-mmrp.three_packed_event",
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FT_UINT8, BASE_DEC, VALS(three_packed_vals), 0x0, NULL, HFILL }
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},
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{ &hf_mmrp_end_mark,
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{ "End Mark", "mrp-mmrp.end_mark",
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FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }
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},
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_mmrp,
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&ett_msg,
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&ett_attr_list,
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&ett_vect_attr,
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&ett_vector_header,
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&ett_first_value
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};
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/* Register the protocol name and description */
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proto_mmrp = proto_register_protocol("Multiple Mac Registration Protocol",
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"MRP-MMRP", "mrp-mmrp");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_mmrp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_mrp_mmrp(void)
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{
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dissector_handle_t mmrp_handle;
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mmrp_handle = create_dissector_handle(dissect_mmrp, proto_mmrp);
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dissector_add_uint("ethertype", ETHERTYPE_MMRP, mmrp_handle);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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