/* packet-devicenet.c

 * Routines for dissection of DeviceNet

 * DeviceNet Home: www.odva.org

 *

 * This dissector includes items from:

 *    CIP Volume 3: DeviceNet Adaptation of CIP, Edition 1.14

 *

 * Michael Mann

 * Erik Ivarsson <eriki@student.chalmers.se>

 * Hans-Jorgen Gunnarsson <hag@hms.se>

 * Copyright 2012

 *

 * Wireshark - Network traffic analyzer

 * By Gerald Combs <gerald@wireshark.org>

 * Copyright 1998 Gerald Combs

 *

 * SPDX-License-Identifier: GPL-2.0-or-later

 */

#include "config.h"

#include <epan/packet.h>

#include <epan/uat.h>

#include <epan/prefs.h>

#include <epan/expert.h>

#include <epan/address_types.h>

#include <epan/to_str.h>

#include "packet-cip.h"

#include "packet-socketcan.h"

void proto_register_devicenet(void);

void proto_reg_handoff_devicenet(void);

static dissector_handle_t devicenet_handle;

#define DEVICENET_CANID_MASK            CAN_SFF_MASK

#define MESSAGE_GROUP_1_ID              0x03FF

#define MESSAGE_GROUP_1_MSG_MASK        0x03C0

#define MESSAGE_GROUP_1_MAC_ID_MASK     0x003F

#define MESSAGE_GROUP_2_ID              0x05FF

#define MESSAGE_GROUP_2_MSG_MASK        0x0007

#define MESSAGE_GROUP_2_MAC_ID_MASK     0x01F8

#define MESSAGE_GROUP_3_ID              0x07BF

#define MESSAGE_GROUP_3_MSG_MASK        0x01C0

#define MESSAGE_GROUP_3_MAC_ID_MASK     0x3F

#define MESSAGE_GROUP_3_FRAG_MASK       0x80

#define MESSAGE_GROUP_3_XID_MASK        0x40

#define MESSAGE_GROUP_4_ID              0x07EF

#define MESSAGE_GROUP_4_MSG_MASK        0x3F

static int proto_devicenet;

static int hf_devicenet_can_id;

static int hf_devicenet_src_mac_id;

static int hf_devicenet_data;

static int hf_devicenet_grp_msg1_id;

static int hf_devicenet_grp_msg2_id;

static int hf_devicenet_grp_msg3_id;

static int hf_devicenet_grp_msg3_frag;

static int hf_devicenet_grp_msg3_xid;

static int hf_devicenet_grp_msg3_dest_mac_id;

static int hf_devicenet_grp_msg4_id;

static int hf_devicenet_rr_bit;

static int hf_devicenet_service_code;

static int hf_devicenet_connection_id;

static int hf_devicenet_open_exp_src_message_id;

static int hf_devicenet_open_exp_dest_message_id;

static int hf_devicenet_open_exp_msg_req_body_format;

static int hf_devicenet_open_exp_msg_actual_body_format;

static int hf_devicenet_open_exp_group_select;

static int hf_devicenet_open_exp_msg_reserved;

static int hf_devicenet_dup_mac_id_rr_bit;

static int hf_devicenet_dup_mac_id_physical_port_number;

static int hf_devicenet_dup_mac_id_serial_number;

static int hf_devicenet_dup_mac_id_vendor;

static int hf_devicenet_comm_fault_rsv;

static int hf_devicenet_comm_fault_match;

static int hf_devicenet_comm_fault_value;

static int hf_devicenet_offline_ownership_reserved;

static int hf_devicenet_offline_ownership_client_mac_id;

static int hf_devicenet_offline_ownership_allocate;

static int hf_devicenet_vendor;

static int hf_devicenet_serial_number;

static int hf_devicenet_class8;

static int hf_devicenet_class16;

static int hf_devicenet_instance8;

static int hf_devicenet_instance16;

static int hf_devicenet_attribute;

static int hf_devicenet_fragment_type;

static int hf_devicenet_fragment_count;

static int ett_devicenet;

static int ett_devicenet_can;

static int ett_devicenet_contents;

static int ett_devicenet_8_8;

static int ett_devicenet_8_16;

static int ett_devicenet_16_8;

static int ett_devicenet_16_16;

static expert_field ei_devicenet_invalid_service;

static expert_field ei_devicenet_invalid_can_id;

static expert_field ei_devicenet_invalid_msg_id;

static expert_field ei_devicenet_frag_not_supported;

static int devicenet_address_type = -1;

enum node_behavior {

    NODE_BEHAVIOR_8_8   = 0,

    NODE_BEHAVIOR_8_16  = 1,

    NODE_BEHAVIOR_16_8  = 2,

    NODE_BEHAVIOR_16_16 = 3

};

/* UAT entry structure. */

typedef struct {

    unsigned mac_id;

    enum node_behavior behavior;

} uat_devicenet_record_t;

static uat_devicenet_record_t *uat_devicenet_records;

static uat_t *devicenet_uat;

static unsigned num_devicenet_records_uat;

static bool uat_devicenet_record_update_cb(void* r, char** err) {

    uat_devicenet_record_t* rec = (uat_devicenet_record_t *)r;

    if (rec->mac_id > 63) {

        *err = g_strdup("MAC ID must be between 0-63");

        return false;

    }

    return true;

}

UAT_DEC_CB_DEF(uat_devicenet_records, mac_id, uat_devicenet_record_t)

Unexecuted instantiation: packet-devicenet.c:uat_devicenet_records_mac_id_set_cb

Unexecuted instantiation: packet-devicenet.c:uat_devicenet_records_mac_id_tostr_cb

UAT_VS_DEF(uat_devicenet_records, behavior, uat_devicenet_record_t, enum node_behavior, NODE_BEHAVIOR_8_8, "string")

#if 0

static const enum_val_t bodytype_devicenet_protocol_options[] = {

    { "eightovereight", "8/8", 0 },

    { "eightoversixteen", "8/16", 1 },

    { "sixteenovereight", "16/8", 2 },

    { "sixteenoversixteen", "16/16", 3 },

    { NULL, NULL, 0 }

};

#endif

#define SC_OPEN_EXPLICIT_MESSAGE    0x4B

#define SC_CLOSE_EXPLICIT_MESSAGE   0x4C

#define SC_DEVICE_HEARTBEAT_MESSAGE 0x4D

#define SC_DEVICE_SHUTOWN_MESSAGE   0x4E

static const value_string devicenet_service_code_vals[] = {

    GENERIC_SC_LIST

    { SC_OPEN_EXPLICIT_MESSAGE,     "Open Explicit Message Connection Request" },

    { SC_CLOSE_EXPLICIT_MESSAGE,    "Close Connection Request" },

    { SC_DEVICE_HEARTBEAT_MESSAGE,  "Device Heartbeat Message" },

    { SC_DEVICE_SHUTOWN_MESSAGE,    "Device Shutdown Message" },

    { 0, NULL }

};

static const value_string devicenet_grp_msg1_vals[] = {

    { 0x0300, "Slave's I/O Multicast Poll Response" },

    { 0x0340, "Slave's I/O Change of State or Cyclic Message" },

    { 0x0380, "Slave's I/O Bit-Strobe Response Message" },

    { 0x03C0, "Slave's I/O Poll Response or COS/Cyclic Ack Message" },

    { 0, NULL }

};

static const value_string devicenet_grp_msg2_vals[] = {

    { 0x00, "Master's I/O Bit-Strobe Command Message" },

    { 0x01, "Master's I/O Multicast Poll Group ID" },

    { 0x02, "Master's Change of State or Cyclic Acknowledge Message" },

    { 0x03, "Slave's Explicit/Unconnected Response Messages" },

    { 0x04, "Master's Explicit Request Messages" },

    { 0x05, "Master's I/O Poll Command/COS/Cyclic Messages" },

    { 0x06, "Group 2 Only Unconnected Explicit Request Messages" },

    { 0x07, "Duplicate MAC ID Check Messages" },

    { 0, NULL }

};

static const value_string devicenet_grp_msg3_vals[] = {

    { 0x000, "Group 3 Message" },

    { 0x040, "Group 3 Message" },

    { 0x080, "Group 3 Message" },

    { 0x0C0, "Group 3 Message" },

    { 0x100, "Group 3 Message" },

    { 0x140, "Unconnected Explicit Response Message" },

    { 0x180, "Unconnected Explicit Request Message" },

    { 0x1C0, "Invalid Group 3 Message" },

    { 0, NULL }

};

#define GRP4_COMM_FAULT_RESPONSE    0x2C

#define GRP4_COMM_FAULT_REQUEST     0x2D

#define GRP4_OFFLINE_OWNER_RESPONSE 0x2E

#define GRP4_OFFLINE_OWNER_REQUEST  0x2F

static const value_string devicenet_grp_msg4_vals[] = {

    { GRP4_COMM_FAULT_RESPONSE, "Communication Faulted Response Message" },

    { GRP4_COMM_FAULT_REQUEST, "Communication Faulted Request Message" },

    { GRP4_OFFLINE_OWNER_RESPONSE, "Offline Ownership Response Message" },

    { GRP4_OFFLINE_OWNER_REQUEST, "Offline Ownership Request Message" },

    { 0, NULL }

};

static const value_string devicenet_message_body_format_vals[] = {

    { 0x00, "DeviceNet 8/8. Class ID = 8 bit integer, Instance ID = 8 bit integer" },

    { 0x01, "DeviceNet 8/16. Class ID = 8 bit integer, Instance ID = 16 bit integer" },

    { 0x02, "DeviceNet 16/16. Class ID = 16 bit integer. Instance ID = 16 bit integer" },

    { 0x03, "DeviceNet 16/8. Class ID = 16 bit integer. Instance ID = 8 bit integer" },

    { 0x04, "CIP Path. The addressing size is variable and is provided as a Packed EPATH on each request" },

    { 0x05, "Reserved by DeviceNet" },

    { 0x06, "Reserved by DeviceNet" },

    { 0x07, "Reserved by DeviceNet" },

    { 0x08, "Reserved by DeviceNet" },

    { 0x09, "Reserved by DeviceNet" },

    { 0x0A, "Reserved by DeviceNet" },

    { 0x0B, "Reserved by DeviceNet" },

    { 0x0C, "Reserved by DeviceNet" },

    { 0x0D, "Reserved by DeviceNet" },

    { 0x0E, "Reserved by DeviceNet" },

    { 0x0F, "Reserved by DeviceNet" },

    { 0, NULL }

};

static const value_string devicenet_group_select_vals[] = {

    { 0x00, "Message Group 1" },

    { 0x01, "Message Group 2" },

    { 0x02, "Reserved" },

    { 0x03, "Message Group 3" },

    { 0x04, "Reserved by DeviceNet" },

    { 0x05, "Reserved by DeviceNet" },

    { 0x06, "Reserved by DeviceNet" },

    { 0x07, "Reserved by DeviceNet" },

    { 0x08, "Reserved by DeviceNet" },

    { 0x09, "Reserved by DeviceNet" },

    { 0x0A, "Reserved by DeviceNet" },

    { 0x0B, "Reserved by DeviceNet" },

    { 0x0C, "Reserved by DeviceNet" },

    { 0x0D, "Reserved by DeviceNet" },

    { 0x0E, "Reserved by DeviceNet" },

    { 0x0F, "Reserved by Node Ping" },

    { 0, NULL }

};

static const value_string devicenet_fragmented_message_type_vals[] = {

    { 0,    "First Fragment" },

    { 1,    "Middle fragment" },

    { 2,    "Last fragment" },

    { 3,    "Fragment Acknowledge" },

    { 0, NULL }

};

#if 0

static const value_string devicenet_io_attribute_vals[] = {

    {0x01, "Vendor ID"},

    {0x02, "Device Type"},

    {0x03, "Product Code"},

    {0x04, "Revision"},

    {0x05, "Status"},

    {0x06, "Serial Number"},

    {0x07, "Product Name"},

    { 0, NULL }

};

#endif

static int body_type_8_over_8_dissection(uint8_t data_length, proto_tree *devicenet_tree,

                                          tvbuff_t *tvb, packet_info *pinfo _U_, int offset)

{

    uint16_t class_id, instance, attribute;

    const attribute_info_t* att_info;

    int start_offset = offset, length;

    proto_item* ti;

    devicenet_tree = proto_tree_add_subtree(devicenet_tree, tvb, offset, -1, ett_devicenet_8_8, NULL, "DeviceNet 8/8");

    proto_tree_add_item(devicenet_tree, hf_devicenet_class8,  tvb, offset, 1, ENC_LITTLE_ENDIAN);

    class_id = tvb_get_uint8(tvb, offset);

    offset++;

    proto_tree_add_item(devicenet_tree, hf_devicenet_instance8,  tvb, offset, 1, ENC_LITTLE_ENDIAN);

    instance = tvb_get_uint8(tvb, offset);

    offset++;

    if (data_length > 3)

    {

        attribute = tvb_get_uint8(tvb, offset);

        ti = proto_tree_add_item(devicenet_tree, hf_devicenet_attribute,  tvb, offset, 1, ENC_LITTLE_ENDIAN);

        att_info = cip_get_attribute(class_id, instance, attribute);

        if (att_info != NULL)

            proto_item_append_text(ti, " (%s)", att_info->text);

        offset++;

    }

    if (data_length > 4)

    {

        length = offset-start_offset;

        proto_tree_add_item(devicenet_tree, hf_devicenet_data, tvb, offset, length, ENC_NA);

        offset += length;

    }

    return offset;

}

static int body_type_8_over_16_dissection(uint8_t data_length, proto_tree *devicenet_tree,

                                           tvbuff_t *tvb, packet_info *pinfo _U_, int offset)

{

    uint16_t class_id, instance, attribute;

    const attribute_info_t* att_info;

    proto_item* ti;

    devicenet_tree = proto_tree_add_subtree(devicenet_tree, tvb, offset, -1, ett_devicenet_8_16, NULL, "DeviceNet 8/16");

    proto_tree_add_item(devicenet_tree, hf_devicenet_class8, tvb, offset, 1, ENC_LITTLE_ENDIAN);

    class_id = tvb_get_uint8(tvb, offset);

    offset++;

    proto_tree_add_item(devicenet_tree, hf_devicenet_instance16, tvb, offset, 2, ENC_LITTLE_ENDIAN);

    instance = tvb_get_letohs(tvb, offset);

    if (data_length > 4)

    {

        attribute = tvb_get_uint8(tvb, offset);

        ti = proto_tree_add_item(devicenet_tree, hf_devicenet_attribute,  tvb, offset, 1, ENC_LITTLE_ENDIAN);

        att_info = cip_get_attribute(class_id, instance, attribute);

        if (att_info != NULL)

            proto_item_append_text(ti, " (%s)", att_info->text);

        offset++;

    }

    return offset;

}

static int body_type_16_over_8_dissection(uint8_t data_length, proto_tree *devicenet_tree, tvbuff_t *tvb,

                                           packet_info *pinfo _U_, int offset)

{

    uint16_t class_id, instance, attribute;

    const attribute_info_t* att_info;

    proto_item* ti;

    devicenet_tree = proto_tree_add_subtree(devicenet_tree, tvb, offset, -1, ett_devicenet_16_8, NULL, "DeviceNet 16/8");

    proto_tree_add_item(devicenet_tree, hf_devicenet_class16, tvb, offset, 2, ENC_LITTLE_ENDIAN);

    class_id = tvb_get_letohs(tvb, offset);

    offset += 2;

    proto_tree_add_item(devicenet_tree, hf_devicenet_instance8, tvb, offset, 1, ENC_LITTLE_ENDIAN);

    instance = tvb_get_uint8(tvb, offset);

    offset++;

    if (data_length > 4)

    {

        attribute = tvb_get_uint8(tvb, offset);

        ti = proto_tree_add_item(devicenet_tree, hf_devicenet_attribute,  tvb, offset, 1, ENC_LITTLE_ENDIAN);

        att_info = cip_get_attribute(class_id, instance, attribute);

        if (att_info != NULL)

            proto_item_append_text(ti, " (%s)", att_info->text);

        offset++;

    }

    return offset;

}

static int body_type_16_over_16_dissection(uint8_t data_length, proto_tree *devicenet_tree, tvbuff_t *tvb,

                                            packet_info *pinfo _U_, int offset)

{

    uint16_t class_id, instance, attribute;

    const attribute_info_t* att_info;

    proto_item* ti;

    devicenet_tree = proto_tree_add_subtree(devicenet_tree, tvb, offset, 4, ett_devicenet_16_16, NULL, "DeviceNet 16/16");

    proto_tree_add_item(devicenet_tree, hf_devicenet_class16, tvb, offset, 2, ENC_LITTLE_ENDIAN);

    class_id = tvb_get_letohs(tvb, offset);

    offset += 2;

    proto_tree_add_item(devicenet_tree, hf_devicenet_instance16, tvb, offset, 2, ENC_LITTLE_ENDIAN);

    instance = tvb_get_letohs(tvb, offset);

    offset+=2;

    if (data_length > 5)

    {

        attribute = tvb_get_uint8(tvb, offset);

        ti = proto_tree_add_item(devicenet_tree, hf_devicenet_attribute,  tvb, offset, 1, ENC_LITTLE_ENDIAN);

        att_info = cip_get_attribute(class_id, instance, attribute);

        if (att_info != NULL)

            proto_item_append_text(ti, " (%s)", att_info->text);

        offset++;

    }

    return offset;

}

static int dissect_devicenet(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)

{

    proto_item *ti, *can_id_item,

               *msg_id_item, *service_item;

    proto_tree *devicenet_tree, *can_tree, *content_tree;

    int offset = 0;

    uint16_t message_id;

    uint32_t data_length = tvb_reported_length(tvb);

    uint8_t source_mac;

    struct can_info can_info;

    uint8_t service_rr;

    uint8_t *src_address, *dest_address;

    DISSECTOR_ASSERT(data);

    can_info = *((struct can_info*)data);

    if (can_info.id & (CAN_ERR_FLAG | CAN_RTR_FLAG | CAN_EFF_FLAG))

    {

        /* Error, RTR and frames with extended ids are not for us. */

        return 0;

    }

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "DeviceNet");

    ti = proto_tree_add_item(tree, proto_devicenet, tvb, offset, -1, ENC_NA);

    devicenet_tree = proto_item_add_subtree(ti, ett_devicenet);

    can_tree = proto_tree_add_subtree_format(devicenet_tree, tvb, 0, 0, ett_devicenet_can, NULL, "CAN Identifier: 0x%04x", can_info.id);

    can_id_item = proto_tree_add_uint(can_tree, hf_devicenet_can_id, tvb, 0, 0, can_info.id);

    proto_item_set_generated(can_id_item);

    /*

     * Message group 1

     */

    if ( can_info.id <= MESSAGE_GROUP_1_ID )

    {

        ti = proto_tree_add_uint(can_tree, hf_devicenet_grp_msg1_id, tvb, 0, 0, can_info.id);

        proto_item_set_generated(ti);

        ti = proto_tree_add_uint(can_tree, hf_devicenet_src_mac_id, tvb, 0, 0, can_info.id & MESSAGE_GROUP_1_MAC_ID_MASK);

        proto_item_set_generated(ti);

        /* Set source address */

        src_address = (uint8_t*)wmem_alloc(pinfo->pool, 1);

        *src_address = (uint8_t)(can_info.id & MESSAGE_GROUP_1_MAC_ID_MASK);

        set_address(&pinfo->src, devicenet_address_type, 1, (const void*)src_address);

        message_id = can_info.id & MESSAGE_GROUP_1_MSG_MASK;

        col_set_str(pinfo->cinfo, COL_INFO, val_to_str_const(message_id, devicenet_grp_msg1_vals, "Other Group 1 Message"));

        proto_tree_add_item(devicenet_tree, hf_devicenet_data, tvb, offset, data_length, ENC_NA);

    }

    /*

     * Message group 2

     */

    else if (can_info.id <= MESSAGE_GROUP_2_ID )

    {

        ti = proto_tree_add_uint(can_tree, hf_devicenet_grp_msg2_id, tvb, 0, 0, can_info.id);

        proto_item_set_generated(ti);

        /* create display subtree for the protocol */

        message_id = can_info.id & MESSAGE_GROUP_2_MSG_MASK;

        col_set_str(pinfo->cinfo, COL_INFO, val_to_str_const(message_id, devicenet_grp_msg2_vals, "Unknown"));

        ti = proto_tree_add_uint(can_tree, hf_devicenet_src_mac_id, tvb, 0, 0, (can_info.id & MESSAGE_GROUP_2_MAC_ID_MASK) >> 3);

        proto_item_set_generated(ti);

        /* Set source address */

        src_address = (uint8_t*)wmem_alloc(pinfo->pool, 1);

        *src_address = (uint8_t)((can_info.id & MESSAGE_GROUP_2_MAC_ID_MASK) >> 3);

        set_address(&pinfo->src, devicenet_address_type, 1, (const void*)src_address);

        content_tree = proto_tree_add_subtree(devicenet_tree, tvb, offset, -1, ett_devicenet_contents, NULL, "Contents");

        switch (message_id)

        {

        case 0x0:

        case 0x1:

        case 0x2:

        case 0x3:

        case 0x4:

        case 0x5:

            proto_tree_add_item(content_tree, hf_devicenet_data, tvb, offset, data_length, ENC_NA);

            break;

        case 0x6:

            proto_tree_add_item(content_tree, hf_devicenet_data, tvb, offset, data_length, ENC_NA);

            break;

        case 0x7:

            proto_tree_add_item(content_tree, hf_devicenet_dup_mac_id_rr_bit, tvb, offset, 1, ENC_LITTLE_ENDIAN);

            proto_tree_add_item(content_tree, hf_devicenet_dup_mac_id_physical_port_number, tvb, offset, 1, ENC_LITTLE_ENDIAN);

            offset ++;

            proto_tree_add_item(content_tree, hf_devicenet_dup_mac_id_vendor, tvb, offset, 2, ENC_LITTLE_ENDIAN);

            offset+=2;

            proto_tree_add_item(content_tree, hf_devicenet_dup_mac_id_serial_number, tvb, offset, 4, ENC_LITTLE_ENDIAN);

            break;

        }

    }

    /*

     * Message group 3

     */

    else if (can_info.id <= MESSAGE_GROUP_3_ID )

    {

        uint8_t byte1;

        msg_id_item = proto_tree_add_uint(can_tree, hf_devicenet_grp_msg3_id, tvb, 0, 0, can_info.id);

        proto_item_set_generated(msg_id_item);

        ti = proto_tree_add_uint(can_tree, hf_devicenet_src_mac_id, tvb, 0, 0, can_info.id & MESSAGE_GROUP_3_MAC_ID_MASK);

        proto_item_set_generated(ti);

        /* Set source address */

        src_address = (uint8_t*)wmem_alloc(pinfo->pool, 1);

        *src_address = (uint8_t)(can_info.id & MESSAGE_GROUP_3_MAC_ID_MASK);

        set_address(&pinfo->src, devicenet_address_type, 1, (const void*)src_address);

        message_id = can_info.id & MESSAGE_GROUP_3_MSG_MASK;

        col_set_str(pinfo->cinfo, COL_INFO, val_to_str_const(message_id, devicenet_grp_msg3_vals, "Unknown"));

        proto_tree_add_item(devicenet_tree, hf_devicenet_grp_msg3_frag, tvb, offset, 1, ENC_NA);

        proto_tree_add_item(devicenet_tree, hf_devicenet_grp_msg3_xid, tvb, offset, 1, ENC_NA);

        proto_tree_add_item(devicenet_tree, hf_devicenet_grp_msg3_dest_mac_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);

        byte1 = tvb_get_uint8(tvb, offset);

        source_mac = byte1 & MESSAGE_GROUP_3_MAC_ID_MASK;

        /* Set destination address */

        /* XXX - This may be source address depending on message type.  Need to adjust accordingly) */

        dest_address = (uint8_t*)wmem_alloc(pinfo->pool, 1);

        *dest_address = (uint8_t)source_mac;

        set_address(&pinfo->dst, devicenet_address_type, 1, (const void*)dest_address);

        offset++;

        if (byte1 & MESSAGE_GROUP_3_FRAG_MASK)

        {

            col_set_str(pinfo->cinfo, COL_INFO, "Group 3 Message Fragment");

            content_tree = proto_tree_add_subtree(devicenet_tree, tvb, offset, -1, ett_devicenet_contents, NULL, "Fragmentation");

            proto_tree_add_item(content_tree, hf_devicenet_fragment_type, tvb, offset, 1, ENC_LITTLE_ENDIAN);

            proto_tree_add_item(content_tree, hf_devicenet_fragment_count, tvb, offset, 1, ENC_LITTLE_ENDIAN);

            /* TODO: Handle fragmentation */

            proto_tree_add_expert(content_tree, pinfo, &ei_devicenet_frag_not_supported, tvb, offset, -1);

            col_set_str(pinfo->cinfo, COL_INFO,

                        val_to_str_const((tvb_get_uint8(tvb, offset) & 0xC0) >> 6,

                                         devicenet_fragmented_message_type_vals,

                                         "Unknown fragmented message type"));

        }

        else

        {

            service_rr = tvb_get_uint8(tvb, offset);

            content_tree = proto_tree_add_subtree_format(devicenet_tree, tvb, offset, -1, ett_devicenet_contents, NULL,

                        "Service: %s (%s)", val_to_str_const(service_rr & CIP_SC_MASK, devicenet_service_code_vals, "Unknown"),

                        service_rr & CIP_SC_RESPONSE_MASK ? "Response" : "Request");

            proto_tree_add_item(content_tree, hf_devicenet_rr_bit, tvb, offset, 1, ENC_LITTLE_ENDIAN);

            service_item = proto_tree_add_item(content_tree, hf_devicenet_service_code, tvb, offset, 1, ENC_LITTLE_ENDIAN);

            offset++;

            col_set_str(pinfo->cinfo, COL_INFO, val_to_str_const(service_rr & CIP_SC_MASK, devicenet_service_code_vals, "Unknown Service Code"));

            if (service_rr & CIP_SC_RESPONSE_MASK)

            {

                col_append_str(pinfo->cinfo, COL_INFO, " - Response");

            }

            else

            {

                col_append_str(pinfo->cinfo, COL_INFO, " - Request");

            }

            switch(message_id)

            {

            case 0x140:

                switch(service_rr & CIP_SC_MASK)

                {

                case SC_OPEN_EXPLICIT_MESSAGE:

                case SC_CLOSE_EXPLICIT_MESSAGE:

                case SC_DEVICE_HEARTBEAT_MESSAGE:

                case SC_DEVICE_SHUTOWN_MESSAGE:

                /* XXX - ERROR RESPONSE? */

                    break;

                default:

                    expert_add_info_format(pinfo, service_item, &ei_devicenet_invalid_service,

                        "Invalid service code (0x%x) for Group 3 Message ID 5", service_rr & CIP_SC_MASK);

                    break;

                }

                break;

            case 0x180:

                switch(service_rr & CIP_SC_MASK)

                {

                case SC_OPEN_EXPLICIT_MESSAGE:

                case SC_CLOSE_EXPLICIT_MESSAGE:

                    break;

                default:

                    expert_add_info_format(pinfo, service_item, &ei_devicenet_invalid_service,

                        "Invalid service code (0x%x) for Group 3 Message ID 6", service_rr & CIP_SC_MASK);

                    break;

                }

                break;

            case 0x1C0:

                expert_add_info_format(pinfo, msg_id_item, &ei_devicenet_invalid_msg_id,

                        "Invalid Group 3 Message ID (%d)", message_id);

                break;

            }

            switch(service_rr & CIP_SC_MASK)

            {

            case SC_OPEN_EXPLICIT_MESSAGE:

                /* XXX - Create conversation to track connections */

                if (service_rr & CIP_SC_RESPONSE_MASK)

                {

                    proto_tree_add_item(content_tree, hf_devicenet_open_exp_msg_reserved, tvb, offset, 1, ENC_LITTLE_ENDIAN);

                    proto_tree_add_item(content_tree, hf_devicenet_open_exp_msg_actual_body_format, tvb, offset, 1, ENC_LITTLE_ENDIAN);

                    offset++;

                    proto_tree_add_item(content_tree, hf_devicenet_open_exp_dest_message_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);

                    proto_tree_add_item(content_tree, hf_devicenet_open_exp_src_message_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);

                    offset++;

                    proto_tree_add_item(content_tree, hf_devicenet_connection_id, tvb, offset, 2, ENC_LITTLE_ENDIAN);

                }

                else

                {

                    proto_tree_add_item(content_tree, hf_devicenet_open_exp_msg_reserved, tvb, offset, 1, ENC_LITTLE_ENDIAN);

                    proto_tree_add_item(content_tree, hf_devicenet_open_exp_msg_req_body_format, tvb, offset, 1, ENC_LITTLE_ENDIAN);

                    offset++;

                    proto_tree_add_item(content_tree, hf_devicenet_open_exp_group_select, tvb, offset, 1, ENC_LITTLE_ENDIAN);

                    proto_tree_add_item(content_tree, hf_devicenet_open_exp_src_message_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);

                }

                break;

            case SC_CLOSE_EXPLICIT_MESSAGE:

                /* XXX - Use conversation to track connections */

                if ((service_rr & CIP_SC_RESPONSE_MASK) == 0)

                {

                    proto_tree_add_item(content_tree, hf_devicenet_connection_id, tvb, offset, 2, ENC_LITTLE_ENDIAN);

                }

                break;

            default:

                if(service_rr & CIP_SC_MASK)

                {

                    proto_tree_add_item(devicenet_tree, hf_devicenet_data, tvb, offset, data_length - 2, ENC_NA);

                }

                else

                {

                    unsigned channel;

                    for (channel = 0; channel < num_devicenet_records_uat; channel++)

                    {

                        if (uat_devicenet_records[channel].mac_id == source_mac)

                        {

                            switch(uat_devicenet_records[channel].behavior)

                            {

                            case 0:

                                body_type_8_over_8_dissection(data_length, content_tree, tvb, pinfo, offset);

                                break;

                            case 1:

                                body_type_8_over_16_dissection(data_length, content_tree, tvb, pinfo, offset);

                                break;

                            case 2:

                                body_type_16_over_8_dissection(data_length, content_tree, tvb, pinfo, offset);

                                break;

                            case 3:

                                body_type_16_over_16_dissection(data_length, content_tree, tvb, pinfo, offset);

                                break;

                            default:

                                proto_tree_add_item(content_tree, hf_devicenet_data, tvb, offset, data_length, ENC_NA);

                                break;

                            }

                        }

                    }

                    /* Don't have a behavior defined for this address, default to 8 over 8 */

                    if (channel >= num_devicenet_records_uat)

                    {

                        body_type_8_over_8_dissection(data_length, content_tree, tvb, pinfo, offset);

                    }

                }

                break;

            }

        }

    }

    /*Message group 4*/

    else if (can_info.id <= MESSAGE_GROUP_4_ID )

    {

        ti = proto_tree_add_uint(can_tree, hf_devicenet_grp_msg4_id, tvb, 0, 0, can_info.id);

        proto_item_set_generated(ti);

        message_id = can_info.id & MESSAGE_GROUP_4_MSG_MASK;

        col_set_str(pinfo->cinfo, COL_INFO, val_to_str_const(message_id, devicenet_grp_msg4_vals, "Reserved Group 4 Message"));

        switch(message_id)

        {

        case GRP4_COMM_FAULT_RESPONSE:

        case GRP4_COMM_FAULT_REQUEST:

            if(data_length == 2)

            {

                proto_tree_add_item(devicenet_tree, hf_devicenet_comm_fault_rsv, tvb, offset, 1, ENC_LITTLE_ENDIAN);

                proto_tree_add_item(devicenet_tree, hf_devicenet_comm_fault_match, tvb, offset, 1, ENC_LITTLE_ENDIAN);

                proto_tree_add_item(devicenet_tree, hf_devicenet_comm_fault_value, tvb, offset, 1, ENC_LITTLE_ENDIAN);

                offset++;

                proto_tree_add_item(devicenet_tree, hf_devicenet_rr_bit, tvb, offset, 1, ENC_LITTLE_ENDIAN);

                proto_tree_add_item(devicenet_tree, hf_devicenet_service_code, tvb, offset, 1, ENC_LITTLE_ENDIAN);

                if( tvb_get_uint8(tvb, offset) & CIP_SC_RESPONSE_MASK)

                {

                    col_append_str(pinfo->cinfo, COL_INFO, " - Response");

                }

                else

                {

                    col_append_str(pinfo->cinfo, COL_INFO, " - Request");

                }

            }

            else if(data_length == 8)

            {

                proto_tree_add_item(devicenet_tree, hf_devicenet_comm_fault_rsv, tvb, offset, 1, ENC_LITTLE_ENDIAN);

                offset++;

                proto_tree_add_item(devicenet_tree, hf_devicenet_rr_bit, tvb, offset, 1, ENC_LITTLE_ENDIAN);

                proto_tree_add_item(devicenet_tree, hf_devicenet_service_code, tvb, offset, 1, ENC_LITTLE_ENDIAN);

                if( tvb_get_uint8(tvb, offset) & CIP_SC_RESPONSE_MASK)

                {

                    col_append_str(pinfo->cinfo, COL_INFO, " - Response");

                }

                else

                {

                    col_append_str(pinfo->cinfo, COL_INFO, " - Request");

                }

                offset++;

                proto_tree_add_item(devicenet_tree, hf_devicenet_vendor, tvb, offset, 2, ENC_LITTLE_ENDIAN);

                offset +=2;

                proto_tree_add_item(devicenet_tree, hf_devicenet_serial_number, tvb, offset, 4, ENC_LITTLE_ENDIAN);

            }

            break;

        case GRP4_OFFLINE_OWNER_REQUEST:

        case GRP4_OFFLINE_OWNER_RESPONSE:

            proto_tree_add_item(devicenet_tree, hf_devicenet_offline_ownership_reserved,  tvb, offset, 1, ENC_LITTLE_ENDIAN);

            proto_tree_add_item(devicenet_tree, hf_devicenet_offline_ownership_client_mac_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);

            offset++;

            proto_tree_add_item(devicenet_tree, hf_devicenet_rr_bit, tvb, offset, 1, ENC_LITTLE_ENDIAN);

            if( tvb_get_uint8(tvb, offset) & CIP_SC_RESPONSE_MASK)

            {

                col_append_str(pinfo->cinfo, COL_INFO, " - Response");

            }

            else

            {

                col_append_str(pinfo->cinfo, COL_INFO, " - Request");

            }

            proto_tree_add_item(devicenet_tree, hf_devicenet_offline_ownership_allocate, tvb, offset, 1, ENC_LITTLE_ENDIAN);

            offset++;

            proto_tree_add_item(devicenet_tree, hf_devicenet_vendor, tvb, offset, 2, ENC_LITTLE_ENDIAN);

            offset +=2;

            proto_tree_add_item(devicenet_tree, hf_devicenet_serial_number, tvb, offset, 4, ENC_LITTLE_ENDIAN);

            break;

        }

    }

    /*Invalid CAN message*/

    else

    {

        col_add_fstr(pinfo->cinfo, COL_INFO, "Invalid CAN Message 0x%06X", can_info.id);

        expert_add_info_format(pinfo, can_id_item, &ei_devicenet_invalid_can_id,

                    "Invalid CAN Message 0x%04X", can_info.id);

    }

    return tvb_captured_length(tvb);

}

static int devicenet_addr_to_str(const address* addr, char *buf, int buf_len)

{

    const uint8_t *addrdata = (const uint8_t *)addr->data;

    uint32_to_str_buf(*addrdata, buf, buf_len);

    return (int)strlen(buf);

}

static int devicenet_addr_str_len(const address* addr _U_)

{

    return 11; /* Leaves required space (10 bytes) for uint_to_str_back() */

}

static int devicenet_addr_len(void)

{

    return 1;

}

void proto_register_devicenet(void)

{

    module_t *devicenet_module;

    expert_module_t*expert_devicenet;

    static hf_register_info hf[] = {

        { &hf_devicenet_can_id,

            {"CAN Identifier", "devicenet.can_id",

            FT_UINT16, BASE_HEX, NULL, DEVICENET_CANID_MASK,

            NULL, HFILL }

        },

        { &hf_devicenet_src_mac_id,

            { "Source MAC ID", "devicenet.src_mac_id",

            FT_UINT8, BASE_DEC, NULL, 0,

            NULL, HFILL }

        },

        { &hf_devicenet_connection_id,

            { "Connection ID", "devicenet.connection_id",

            FT_UINT16, BASE_DEC, NULL, 0,

            NULL, HFILL }

        },

        { &hf_devicenet_data,

            { "Data", "devicenet.data",

            FT_BYTES, BASE_NONE, NULL, 0,

            NULL, HFILL }

        },

        { &hf_devicenet_grp_msg1_id,

            { "Group 1 message ID", "devicenet.grp_msg1.id",

            FT_UINT16, BASE_DEC, NULL, MESSAGE_GROUP_1_MSG_MASK,

            NULL, HFILL }

        },

        { &hf_devicenet_grp_msg2_id,

            { "Group 2 message ID", "devicenet.grp_msg2.id",

            FT_UINT16, BASE_DEC, NULL, MESSAGE_GROUP_2_MSG_MASK,

            NULL, HFILL }

        },

        { &hf_devicenet_grp_msg3_id,

            { "Group 3 message ID", "devicenet.grp_msg3.id",

            FT_UINT16, BASE_DEC, NULL, MESSAGE_GROUP_3_MSG_MASK,

            NULL, HFILL }

        },

        { &hf_devicenet_grp_msg3_dest_mac_id,

            { "Destination MAC ID", "devicenet.dest_mac_id",

            FT_UINT8, BASE_DEC, NULL, 0x3F,

            NULL, HFILL }

        },

        { &hf_devicenet_grp_msg3_frag,

            { "Frag", "devicenet.grp_msg3.frag",

            FT_BOOLEAN, 8, NULL, MESSAGE_GROUP_3_FRAG_MASK,

            NULL, HFILL }

        },

        { &hf_devicenet_grp_msg3_xid,

            { "XID", "devicenet.grp_msg3.xid",

            FT_BOOLEAN, 8, NULL, MESSAGE_GROUP_3_XID_MASK,

            NULL, HFILL }

        },

        { &hf_devicenet_grp_msg4_id,

            { "Group 4 message ID", "devicenet.grp_msg4.id",

            FT_UINT16, BASE_DEC, NULL, MESSAGE_GROUP_4_MSG_MASK,

            NULL, HFILL }

        },

        { &hf_devicenet_rr_bit,

            { "Request/Response", "devicenet.rr",

            FT_UINT8, BASE_DEC, VALS(cip_sc_rr), CIP_SC_RESPONSE_MASK,

            "Request or Response message", HFILL }

        },

        { &hf_devicenet_service_code,

            { "Service Code", "devicenet.service",

            FT_UINT8, BASE_DEC, VALS(devicenet_service_code_vals), CIP_SC_MASK,

            NULL, HFILL }

        },

        { &hf_devicenet_open_exp_src_message_id,

            { "Source Message ID", "devicenet.open_message.src_message_id",

            FT_UINT8, BASE_DEC, NULL, 0x0F,

            NULL, HFILL }

        },

        { &hf_devicenet_open_exp_dest_message_id,

            { "Destination Message ID", "devicenet.open_message.dest_message_id",

            FT_UINT8, BASE_DEC, NULL, 0xF0,

            NULL, HFILL }

        },

        { &hf_devicenet_open_exp_msg_reserved,

            { "Reserved", "devicenet.open_message.reserved",

            FT_UINT8, BASE_DEC, NULL, 0xF0,

            NULL, HFILL }

        },

        { &hf_devicenet_open_exp_msg_req_body_format,

            { "Requested Message Body Format", "devicenet.open_message.req_body_format",

            FT_UINT8, BASE_DEC, VALS(devicenet_message_body_format_vals), 0x0F,

            NULL, HFILL }

        },

        { &hf_devicenet_open_exp_msg_actual_body_format,

            { "Actual Message Body Format", "devicenet.open_message.actual_body_format",

            FT_UINT8, BASE_DEC, VALS(devicenet_message_body_format_vals), 0x0F,

            NULL, HFILL }

        },

        { &hf_devicenet_open_exp_group_select,

            { "Group Select", "devicenet.open_message.group_select",

            FT_UINT8, BASE_DEC, VALS(devicenet_group_select_vals), 0xF0,

            NULL, HFILL }

        },

        { &hf_devicenet_dup_mac_id_rr_bit,

            { "Request/Response", "devicenet.dup_mac_id.rr",

            FT_UINT8, BASE_DEC, VALS(cip_sc_rr), CIP_SC_RESPONSE_MASK,

            "Duplicate MAC ID Request or Response message", HFILL }

        },

        { &hf_devicenet_dup_mac_id_physical_port_number,

            { "Physical port number", "devicenet.dup_mac_id.physical_port_number",

            FT_UINT8, BASE_DEC, NULL, 0x7F,

            "Duplicate MAC ID check message physical port number", HFILL }

        },

        { &hf_devicenet_dup_mac_id_vendor,

            { "Vendor ID", "devicenet.dup_mac_id.vendor",

            FT_UINT16, BASE_HEX|BASE_EXT_STRING, &cip_vendor_vals_ext, 0,

            NULL, HFILL }

        },

        { &hf_devicenet_dup_mac_id_serial_number,

            { "Serial Number", "devicenet.dup_mac_id.serial_number",

            FT_UINT32, BASE_HEX, NULL, 0x00,

            NULL, HFILL }

        },

        { &hf_devicenet_vendor,

            { "Vendor ID", "devicenet.vendor",

            FT_UINT16, BASE_HEX|BASE_EXT_STRING, &cip_vendor_vals_ext, 0,

            NULL, HFILL }

        },

        { &hf_devicenet_serial_number,

            { "Serial Number", "devicenet.serial_number",

            FT_UINT32, BASE_HEX, NULL, 0x00,

            NULL, HFILL }

        },

        { &hf_devicenet_instance8,

            { "Instance", "devicenet.instance",

            FT_UINT8, BASE_HEX, NULL, 0x00,

            NULL, HFILL }

        },

        { &hf_devicenet_instance16,

            { "Instance", "devicenet.instance",

            FT_UINT16, BASE_HEX, NULL, 0x00,