/* packet-msdp.c

 * Routines for Multicast Source Discovery Protocol (MSDP) dissection.

 * RFC 3618

 *

 * Copyright 2001, Heikki Vatiainen <hessu@cs.tut.fi>

 *

 * 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/to_str.h>

#include <epan/expert.h>

void proto_register_msdp(void);

void proto_reg_handoff_msdp(void);

/* MSDP (Type-Length-Value) TLV types. The messages are a sequence of TLVs. */

enum { MSDP_SA     = 1,

       MSDP_SA_REQ,

       MSDP_SA_RSP,

       MSDP_KEEP_ALIVE,

       MSDP_NOTIFICATION,  /* draft 10, but not RFC 3618 */

       /* These are only assigned in MSDP spec. Their use is specified

        * elsewhere */

       MSDP_TRACE_IN_PROGRESS,

       MSDP_TRACE_REPLY

};

static const value_string msdp_types[] = {

        { MSDP_SA,                "IPv4 Source-Active"           },

        { MSDP_SA_REQ,            "IPv4 Source-Active Request"   },

        { MSDP_SA_RSP,            "IPv4 Source-Active Response"  },

        { MSDP_KEEP_ALIVE,        "KeepAlive"                    },

        { MSDP_NOTIFICATION,      "Notification"                 },

        { MSDP_TRACE_IN_PROGRESS, "MSDP traceroute in progress"  },

        { MSDP_TRACE_REPLY,       "MSDP traceroute reply"        },

        { 0, NULL },

};

/* Error codes */

enum { MESSAGE_HEADER_ERROR = 1,

       SA_REQUEST_ERROR,

       SA_MESSAGE_SA_RESPONSE_ERROR,

       HOLD_TIMER_EXPIRED,

       FSM_ERROR,

       NOTIFICATION,

       CEASE

};

static const value_string error_vals[] = {

        { MESSAGE_HEADER_ERROR,         "Message Header Error"         },

        { SA_REQUEST_ERROR,             "SA-Request Error"             },

        { SA_MESSAGE_SA_RESPONSE_ERROR, "SA-Message/SA-Response Error" },

        { HOLD_TIMER_EXPIRED,           "Hold Timer Expired"           },

        { FSM_ERROR,                    "Finite State Machine Error"   },

        { NOTIFICATION,                 "Notification"                 },

        { CEASE,                        "Cease"                        },

        { 0, NULL },

};

/* Message Header Error subcodes */

static const value_string hdr_error_vals[] = {

        { 0, "Unspecific"         },

        { 2, "Bad Message Length" },

        { 3, "Bad Message Type"   },

        { 0, NULL },

};

/* SA-Request Error subcodes (the O-bit is always clear) */

static const value_string sa_req_error_vals[] = {

        { 0, "Unspecific"    },

        { 1, "Invalid Group" },

        { 0, NULL },

};

/* SA-Message/SA-Response Error subcodes */

static const value_string sa_msg_error_vals[] = {

        { 0, "Unspecific"                             },

        { 1, "Invalid Entry Count"                    },

        { 2, "Invalid RP Address"                     },

        { 3, "Invalid Group Address"                  },

        { 4, "Invalid Source Address"                 },

        { 5, "Invalid Sprefix Length"                 },

        { 6, "Looping SA (Self is RP)"                },

        { 7, "Unknown Encapsulation"                  },

        { 8, "Administrative Scope Boundary Violated" },

        { 0, NULL },

};

/* Finite State Machine Error subcodes (the O-bit is always clear) */

static const value_string fsm_error_vals[] = {

        { 0, "Unspecific"                        },

        { 1, "Unexpected Message Type FSM Error" },

        { 0, NULL },

};

/*

 * Hold Timer Expired subcodes (the O-bit is always clear):

 * Notification subcodes (the O-bit is always clear):

 * Cease subcodes (the O-bit is always clear):

 *

 * These have only "Unspecific" specified.

 */

static const value_string sa_unspec_error_vals[] = {

        { 0, "Unspecific" },

        { 0, NULL },

};

#define MSDP_PORT  639

/* Initialize the protocol and registered fields */

static int proto_msdp;

static int hf_msdp_type;

static int hf_msdp_length;

static int hf_msdp_sa_entry_count;

static int hf_msdp_sa_rp_addr;

static int hf_msdp_sa_reserved;

static int hf_msdp_sa_sprefix_len;

static int hf_msdp_sa_group_addr;

static int hf_msdp_sa_src_addr;

static int hf_msdp_sa_req_res;

static int hf_msdp_sa_req_group;

static int hf_msdp_not_o;

static int hf_msdp_not_error;

static int hf_msdp_not_error_sub;

static int hf_msdp_not_group_address;

static int hf_msdp_not_rp_address;

static int hf_msdp_not_source_address;

static int hf_msdp_not_res;

static int hf_msdp_not_entry_count;

static int hf_msdp_not_sprefix_len;

static int hf_msdp_tlv_contents;

static int hf_msdp_trailing_junk;

static int hf_msdp_unknown_data;

static int ett_msdp;

static int ett_msdp_sa_entry;

static int ett_msdp_sa_enc_data;

static int ett_msdp_not_data;

static expert_field ei_msdp_tlv_len_too_short;

static expert_field ei_msdp_tlv_len_too_long;

static dissector_handle_t msdp_handle;

static dissector_handle_t ip_handle;

static void

dissect_msdp_sa(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,

    int *offset, int length, proto_item *length_item);

static void

dissect_msdp_notification(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,

    int *offset, uint16_t tlv_len, proto_item *length_item);

static int

// NOLINTNEXTLINE(misc-no-recursion)

dissect_msdp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)

{

        proto_item *ti;

        proto_tree *msdp_tree;

        proto_item *length_item;

        int         offset;

        uint32_t    type;

        uint32_t    length;

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

        col_set_str(pinfo->cinfo, COL_INFO, val_to_str_const(tvb_get_uint8(tvb, 0),

                                                                     msdp_types,

                                                                     "<Unknown MSDP TLV type>"));

        ti = proto_tree_add_item(tree, proto_msdp, tvb, 0, -1, ENC_NA);

        msdp_tree = proto_item_add_subtree(ti, ett_msdp);

        offset = 0;

        increment_dissection_depth(pinfo);

        while (tvb_reported_length_remaining(tvb, offset) != 0) {

                proto_tree_add_item_ret_uint(msdp_tree, hf_msdp_type, tvb, offset, 1, ENC_BIG_ENDIAN, &type);

                length_item = proto_tree_add_item_ret_uint(msdp_tree, hf_msdp_length, tvb, offset + 1, 2, ENC_BIG_ENDIAN, &length);

                if (length < 3) {

                        expert_add_info_format(pinfo, length_item,

                            &ei_msdp_tlv_len_too_short,

                            "TLV length < 3");

                        break;

                }

                offset += 3;

                length -= 3;

                switch (type) {

                case MSDP_SA:

                        dissect_msdp_sa(tvb, pinfo, msdp_tree, &offset,

                                        length, length_item);

                        break;

                case MSDP_SA_REQ:

                        /*

                         * This type is mentioned in the RFC but the format

                         * isn't described.

                         */

                        if (length < 1) {

                                expert_add_info_format(pinfo, length_item,

                                    &ei_msdp_tlv_len_too_short,

                                    "TLV length for IPv4 Source-Active Request < 8");

                                break;

                        }

                        proto_tree_add_item(msdp_tree, hf_msdp_sa_req_res, tvb, offset, 1, ENC_BIG_ENDIAN);

                        offset += 1;

                        length -= 1;

                        if (length < 4) {

                                expert_add_info_format(pinfo, length_item,

                                    &ei_msdp_tlv_len_too_short,

                                    "TLV length for IPv4 Source-Active Request < 8");

                                offset += length;

                                break;

                        }

                        proto_tree_add_item(msdp_tree, hf_msdp_sa_req_group, tvb, offset, 4, ENC_BIG_ENDIAN);

                        offset += 4;

                        length -= 4;

                        if (length > 0) {

                                expert_add_info_format(pinfo, length_item,

                                    &ei_msdp_tlv_len_too_long,

                                    "TLV length for KeepAlive > 8");

                                proto_tree_add_item(tree, hf_msdp_trailing_junk, tvb, offset, length, ENC_NA);

                                offset += length;

                        }

                        break;

                case MSDP_SA_RSP:

                        /*

                         * This type is mentioned in the RFC but the format

                         * isn't described.

                         */

                        dissect_msdp_sa(tvb, pinfo, msdp_tree, &offset,

                                        length, length_item);

                        break;

                case MSDP_KEEP_ALIVE:

                        if (length > 0) {

                                expert_add_info_format(pinfo, length_item,

                                    &ei_msdp_tlv_len_too_long,

                                    "TLV length for KeepAlive > 3");

                                proto_tree_add_item(tree, hf_msdp_trailing_junk, tvb, offset, length, ENC_NA);

                                offset += length;

                        }

                        break;

                case MSDP_NOTIFICATION:

                        /*

                         * This was in draft 10, but is reserved in the

                         * RFC.

                         */

                        dissect_msdp_notification(tvb, pinfo, msdp_tree, &offset, length, length_item);

                        break;

                default:

                        if (length > 0)

                                proto_tree_add_item(msdp_tree, hf_msdp_tlv_contents, tvb, offset, length, ENC_NA);

                        offset += length;

                        break;

                }

        }

        decrement_dissection_depth(pinfo);

        return tvb_captured_length(tvb);

}

/* Both Source-Active and Source-Active Response have the same format

 * with one exception. Encapsulated multicast data is not allowed in

 * SA Response.

 */

static void dissect_msdp_sa(tvbuff_t *tvb, packet_info *pinfo,

    proto_tree *tree, int *offset, int length, proto_item *length_item)

{

        uint32_t entries;

        if (length < 1) {

                expert_add_info_format(pinfo, length_item,

                    &ei_msdp_tlv_len_too_short,

                    "TLV length for IPv4 Source-Active or Source-Active Response < 5");

                return;

        }

        proto_tree_add_item_ret_uint(tree, hf_msdp_sa_entry_count, tvb, *offset, 1, ENC_BIG_ENDIAN, &entries);

        *offset += 1;

        length -= 1;

        if (length < 4) {

                expert_add_info_format(pinfo, length_item,

                    &ei_msdp_tlv_len_too_short,

                    "TLV length for IPv4 Source-Active or Source-Active Response < 5");

                *offset += length;

                return;

        }

        proto_tree_add_item(tree, hf_msdp_sa_rp_addr, tvb, *offset, 4, ENC_BIG_ENDIAN);

        *offset += 4;

        length -= 4;

        /* Put each of the (S,G) entries in their own subtree.

         * This is probably visually better.

         */

        while (entries-- > 0) {

                proto_tree *entry_tree;

                if (length < 12) {

                        expert_add_info_format(pinfo, length_item,

                            &ei_msdp_tlv_len_too_short,

                            "TLV length for IPv4 Source-Active or Source-Active Response too short");

                        *offset += length;

                        return;

                }

                entry_tree = proto_tree_add_subtree_format(tree, tvb, *offset, 12, ett_msdp_sa_entry, NULL,

                                         "(S,G) block: %s/%u -> %s",

                                         tvb_ip_to_str(pinfo->pool, tvb, *offset + 8),

                                         tvb_get_uint8(tvb, *offset + 3),

                                         tvb_ip_to_str(pinfo->pool, tvb, *offset + 4));

                proto_tree_add_item(entry_tree, hf_msdp_sa_reserved, tvb, *offset, 3, ENC_BIG_ENDIAN);

                *offset += 3;

                length -= 3;

                proto_tree_add_item(entry_tree, hf_msdp_sa_sprefix_len, tvb, *offset, 1, ENC_BIG_ENDIAN);

                *offset += 1;

                length -= 1;

                proto_tree_add_item(entry_tree, hf_msdp_sa_group_addr, tvb, *offset, 4, ENC_BIG_ENDIAN);

                *offset += 4;

                length -= 4;

                proto_tree_add_item(entry_tree, hf_msdp_sa_src_addr, tvb, *offset, 4, ENC_BIG_ENDIAN);

                *offset += 4;

                length -= 4;

        }

        /*

         * Check if an encapsulated multicast IPv4 packet follows

         */

        if (length > 0) {

                proto_tree *enc_tree;

                int reported_length;

                tvbuff_t *next_tvb;

                enc_tree = proto_tree_add_subtree_format(tree, tvb, *offset, length,

                                         ett_msdp_sa_enc_data, NULL, "Encapsulated IPv4 packet: %u bytes",

                                         length);

                reported_length = tvb_reported_length_remaining(tvb, *offset);

                DISSECTOR_ASSERT(reported_length >= 0);

                if (reported_length > length)

                        reported_length = length;

                next_tvb = tvb_new_subset_length(tvb, *offset, reported_length);

                /* Set the protocol and information columns read-only so

                 * that they reflect the MSDP packet rather than the

                 * encapsulated packet.

                 */

                col_set_writable(pinfo->cinfo, COL_PROTOCOL, false);

                col_set_writable(pinfo->cinfo, COL_INFO, false);

                call_dissector(ip_handle, next_tvb, pinfo, enc_tree);

        }

        *offset += length;

        return;

}

/* Note: updates *offset */

static void add_notification_data_ipv4addr(tvbuff_t *tvb, proto_tree *tree, int *offset, int hf_addr)

{

        proto_tree_add_item(tree, hf_msdp_not_res, tvb, *offset, 3, ENC_BIG_ENDIAN);

        *offset += 3;

        proto_tree_add_item(tree, hf_addr, tvb, *offset, 4, ENC_BIG_ENDIAN);

        *offset += 4;

        return;

}

// NOLINTNEXTLINE(misc-no-recursion)

static void dissect_msdp_notification(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int *offset, uint16_t tlv_len, proto_item *length_item)

{

        uint8_t             error, error_sub;

        const value_string *vals;

        int reported_length;

        tvbuff_t *next_tvb;

        if (tlv_len < 1) {

                expert_add_info_format(pinfo, length_item,

                    &ei_msdp_tlv_len_too_short,

                    "TLV length for Notification < 4");

                return;

        }

        proto_tree_add_item(tree, hf_msdp_not_o, tvb, *offset, 1, ENC_BIG_ENDIAN);

        proto_tree_add_item(tree, hf_msdp_not_error, tvb, *offset, 1, ENC_BIG_ENDIAN);

        error = tvb_get_uint8(tvb, *offset);

        error &= 0x7F;             /* Error is 7-bit field. O-bit is bit 8 */

        *offset += 1;

        tlv_len -= 1;

        /* Depending on the Error Code, we collect the correct

         * value_strings for the Error subcode

         */

        switch (error) {

        case MESSAGE_HEADER_ERROR:

                vals = hdr_error_vals;

                break;

        case SA_REQUEST_ERROR:

                vals = sa_req_error_vals;

                break;

        case SA_MESSAGE_SA_RESPONSE_ERROR:

                vals = sa_msg_error_vals;

                break;

        case FSM_ERROR:

                vals = fsm_error_vals;

                break;

        case HOLD_TIMER_EXPIRED:

        case NOTIFICATION:

        case CEASE:

                vals = sa_unspec_error_vals;

                break;

        default:

                vals = sa_unspec_error_vals;

                break;

        }

        if (tlv_len < 1) {

                expert_add_info_format(pinfo, length_item,

                    &ei_msdp_tlv_len_too_short,

                    "TLV length for Notification < 5");

                return;

        }

        error_sub = tvb_get_uint8(tvb, *offset);

        proto_tree_add_uint_format_value(tree, hf_msdp_not_error_sub, tvb, *offset, 1,

                                   error_sub, "%s (%u)",

                                   val_to_str_const(error_sub, vals, "<Unknown Error subcode>"),

                                   error_sub);

        *offset += 1;

        tlv_len -= 1;

        /* Do switch again, this time to dissect the data portion

         * correctly. Ugly.

         */

        switch (error) {

        case SA_REQUEST_ERROR:

                if (tlv_len < 7) {

                        expert_add_info_format(pinfo, length_item,

                            &ei_msdp_tlv_len_too_short,

                            "TLV length for Notification SA-Request Error < 12");

                        *offset += tlv_len;

                        return;

                }

                add_notification_data_ipv4addr(tvb, tree, offset, hf_msdp_not_group_address);

                tlv_len -= 7;

                break;

        case SA_MESSAGE_SA_RESPONSE_ERROR:

                if (error_sub == 0) {

                        break;

                } else if (error_sub == 1) {

                        if (tlv_len < 1) {

                                expert_add_info_format(pinfo, length_item,

                                    &ei_msdp_tlv_len_too_short,

                                    "TLV length for Notification SA-Response Invalid Entry Count Error < 6");

                                return;

                        }

                        proto_tree_add_item(tree, hf_msdp_not_entry_count, tvb, *offset, 1, ENC_BIG_ENDIAN);

                        *offset += 1;

                        tlv_len -= 1;

                        break;

                } else if (error_sub == 2) {

                        if (tlv_len < 7) {

                                expert_add_info_format(pinfo, length_item,

                                    &ei_msdp_tlv_len_too_short,

                                    "TLV length for Notification SA-Response Invalid RP Address Error < 12");

                                *offset += tlv_len;

                                return;

                        }

                        add_notification_data_ipv4addr(tvb, tree, offset, hf_msdp_not_rp_address);

                        tlv_len -= 7;

                        break;

                } else if (error_sub == 3 || error_sub == 8) {

                        if (tlv_len < 7) {

                                expert_add_info_format(pinfo, length_item,

                                    &ei_msdp_tlv_len_too_short,

                                    "TLV length for Notification SA-Response %s Error < 12",

                                    (error_sub == 3) ? "Invalid Group Address"

                                                     : "Administrative Scope Boundary Violated");

                                *offset += tlv_len;

                                return;

                        }

                        add_notification_data_ipv4addr(tvb, tree, offset, hf_msdp_not_group_address);

                        tlv_len -= 7;

                        break;

                } else if (error_sub == 4) {

                        if (tlv_len < 7) {

                                expert_add_info_format(pinfo, length_item,

                                    &ei_msdp_tlv_len_too_short,

                                    "TLV length for Notification SA-Response Invalid Source Address Error < 12");

                                *offset += tlv_len;

                                return;

                        }

                        add_notification_data_ipv4addr(tvb, tree, offset, hf_msdp_not_source_address);

                        tlv_len -= 7;

                        break;

                } else if (error_sub == 5) {

                        if (tlv_len < 1) {

                                expert_add_info_format(pinfo, length_item,

                                    &ei_msdp_tlv_len_too_short,

                                    "TLV length for Notification SA-Response Invalid Sprefix Length Error < 6");

                                return;

                        }

                        proto_tree_add_item(tree, hf_msdp_not_sprefix_len, tvb, *offset, 1, ENC_BIG_ENDIAN);

                        *offset += 1;

                        tlv_len -= 1;

                        break;

                } else if (error_sub == 6) {

                        if (tlv_len > 0) {

                                reported_length = tvb_reported_length_remaining(tvb, *offset);

                                DISSECTOR_ASSERT(reported_length >= 0);

                                if (reported_length > tlv_len)

                                        reported_length = tlv_len;

                                next_tvb = tvb_new_subset_length(tvb, *offset, reported_length);

                                dissect_msdp(next_tvb, pinfo, tree, NULL);

                        }

                        *offset += tlv_len;

                        tlv_len = 0;

                } else if (error_sub == 7) {

                        if (tlv_len > 0) {

                                reported_length = tvb_reported_length_remaining(tvb, *offset);

                                DISSECTOR_ASSERT(reported_length >= 0);

                                if (reported_length > tlv_len)

                                        reported_length = tlv_len;

                                next_tvb = tvb_new_subset_length(tvb, *offset, reported_length);

                                dissect_msdp(next_tvb, pinfo, tree, NULL);

                        }

                        *offset += tlv_len;

                        tlv_len = 0;

                        break;

                } else {

                        if (tlv_len > 0)

                                proto_tree_add_item(tree, hf_msdp_unknown_data, tvb, *offset, tlv_len, ENC_NA);

                        *offset += tlv_len;

                        tlv_len = 0;

                        break;

                }

                break;

        case MESSAGE_HEADER_ERROR:

        case NOTIFICATION:

                /* Data contains the message that had an error. Even a

                 * broken Notification message causes a Notification

                 * message with Error Code set to Notification to be

                 * sent back.

                 */

                if (tlv_len > 0) {

                        reported_length = tvb_reported_length_remaining(tvb, *offset);

                        DISSECTOR_ASSERT(reported_length >= 0);

                        if (reported_length > tlv_len)

                                reported_length = tlv_len;

                        next_tvb = tvb_new_subset_length(tvb, *offset, reported_length);

                        dissect_msdp(next_tvb, pinfo, tree, NULL);

                }

                *offset += tlv_len;

                tlv_len = 0;

                break;

        case FSM_ERROR:

        case HOLD_TIMER_EXPIRED:

        case CEASE:

                /* Do nothing. These contain no data */

                break;

        default:

                if (tlv_len > 0)

                        proto_tree_add_item(tree, hf_msdp_unknown_data, tvb, *offset, tlv_len, ENC_NA);

                *offset += tlv_len;

                tlv_len = 0;

                break;

        }

        if (tlv_len != 0) {

                expert_add_info(pinfo, length_item, &ei_msdp_tlv_len_too_long);

                proto_tree_add_item(tree, hf_msdp_trailing_junk, tvb, *offset, tlv_len, ENC_NA);

                *offset += tlv_len;

        }

        return;

}

void

proto_register_msdp(void)

{

        static hf_register_info hf[] = {

                { &hf_msdp_type,

                        { "Type",           "msdp.type",

                        FT_UINT8, BASE_DEC, VALS(msdp_types), 0,

                        "MSDP TLV type", HFILL }

                },

                { &hf_msdp_length,

                        { "Length",           "msdp.length",

                        FT_UINT16, BASE_DEC, NULL, 0,

                        "MSDP TLV Length", HFILL }

                },

                { &hf_msdp_sa_entry_count,

                        { "Entry Count",           "msdp.sa.entry_count",

                        FT_UINT8, BASE_DEC, NULL, 0,

                        "MSDP SA Entry Count", HFILL }

                },

                { &hf_msdp_sa_rp_addr,

                        { "RP Address",           "msdp.sa.rp_addr",

                        FT_IPv4, BASE_NONE, NULL, 0,

                        "Active source's RP address", HFILL }

                },

                { &hf_msdp_sa_reserved,

                        { "Reserved",           "msdp.sa.reserved",

                        FT_UINT24, BASE_HEX, NULL, 0,

                        "Transmitted as zeros and ignored by a receiver", HFILL }

                },

                { &hf_msdp_sa_sprefix_len,

                        { "Sprefix len",           "msdp.sa.sprefix_len",

                        FT_UINT8, BASE_DEC, NULL, 0,

                        "The route prefix length associated with source address", HFILL }

                },

                { &hf_msdp_sa_group_addr,

                        { "Group Address",           "msdp.sa.group_addr",

                        FT_IPv4, BASE_NONE, NULL, 0,

                        "The group address the active source has sent data to", HFILL }

                },

                { &hf_msdp_sa_src_addr,

                        { "Source Address",           "msdp.sa.src_addr",

                        FT_IPv4, BASE_NONE, NULL, 0,

                        "The IP address of the active source", HFILL }

                },

                { &hf_msdp_sa_req_res,

                        { "Reserved",           "msdp.sa_req.res",

                        FT_UINT8, BASE_HEX, NULL, 0,

                        "Transmitted as zeros and ignored by a receiver", HFILL }

                },

                { &hf_msdp_sa_req_group,

                        { "Group Address",           "msdp.sa_req.group_addr",

                        FT_IPv4, BASE_NONE, NULL, 0,

                        "The group address the MSDP peer is requesting", HFILL }

                },

                { &hf_msdp_not_o,

                        { "Open-bit",           "msdp.not.o",

                        FT_UINT8, BASE_HEX, NULL, 0x80,

                        "If clear, the connection will be closed", HFILL }

                },

                { &hf_msdp_not_error,

                        { "Error Code",           "msdp.not.error",

                        FT_UINT8, BASE_DEC, VALS(error_vals), 0x7F,

                        "Indicates the type of Notification", HFILL }

                },

                { &hf_msdp_not_error_sub,

                        { "Error subcode",           "msdp.not.error_sub",

                        FT_UINT8, BASE_DEC, NULL, 0,

                        NULL, HFILL }

                },

                { &hf_msdp_not_group_address,

                        { "Group address",           "msdp.not.group_address",

                        FT_IPv4, BASE_NONE, NULL, 0,

                        "Group address in Notification messages", HFILL }

                },

                { &hf_msdp_not_rp_address,

                        { "RP address",           "msdp.not.rp_address",

                        FT_IPv4, BASE_NONE, NULL, 0,

                        "RP address in Notification messages", HFILL }

                },

                { &hf_msdp_not_source_address,

                        { "Source address",           "msdp.not.source_address",

                        FT_IPv4, BASE_NONE, NULL, 0,

                        "Source address in Notification messages", HFILL }

                },

                { &hf_msdp_not_res,

                        { "Reserved",           "msdp.not.res",

                        FT_UINT24, BASE_HEX, NULL, 0,

                        "Reserved field in Notification messages", HFILL }

                },

                { &hf_msdp_not_entry_count,

                        { "Entry Count",           "msdp.not.entry_count",

                        FT_UINT24, BASE_HEX, NULL, 0,

                        "Entry Count in Notification messages", HFILL }

                },

                { &hf_msdp_not_sprefix_len,

                        { "Sprefix len",           "msdp.not.sprefix_len",

                        FT_UINT8, BASE_DEC, NULL, 0,

                        "Source prefix length in Notification messages", HFILL }

                },

                { &hf_msdp_tlv_contents,

                        { "TLV contents",           "msdp.tlv_contents",

                        FT_BYTES, BASE_NONE, NULL, 0,

                        NULL, HFILL }

                },

                { &hf_msdp_trailing_junk,

                        { "Trailing junk",           "msdp.trailing_junk",

                        FT_BYTES, BASE_NONE, NULL, 0,

                        NULL, HFILL }

                },

                { &hf_msdp_unknown_data,

                        { "Unknown data",           "msdp.unknown_data",

                        FT_BYTES, BASE_NONE, NULL, 0,

                        NULL, HFILL }

                },

        };

        static int *ett[] = {

                &ett_msdp,

                &ett_msdp_sa_entry,

                &ett_msdp_sa_enc_data,

                &ett_msdp_not_data,

        };

        static ei_register_info ei[] = {

                { &ei_msdp_tlv_len_too_long,

                    { "msdp.tlv_len.too_long", PI_PROTOCOL, PI_WARN,

                      "TLV length too long", EXPFILL }

                },

                { &ei_msdp_tlv_len_too_short,

                    { "msdp.tlv_len.too_short", PI_MALFORMED, PI_ERROR,

                      "TLV length too short", EXPFILL }

                },

        };

        expert_module_t *expert_msdp;

        proto_msdp = proto_register_protocol("Multicast Source Discovery Protocol",

            "MSDP", "msdp");

        msdp_handle = register_dissector("msdp", dissect_msdp, proto_msdp);

        proto_register_field_array(proto_msdp, hf, array_length(hf));

        proto_register_subtree_array(ett, array_length(ett));

        expert_msdp = expert_register_protocol(proto_msdp);

        expert_register_field_array(expert_msdp, ei, array_length(ei));

}

void

proto_reg_handoff_msdp(void)

{

        dissector_add_uint_with_preference("tcp.port", MSDP_PORT, msdp_handle);

        ip_handle = find_dissector_add_dependency("ip", proto_msdp);

}

/*

 * Editor modelines

 *

 * Local Variables:

 * c-basic-offset: 8

 * tab-width: 8

 * indent-tabs-mode: nil

 * End:

 *

 * ex: set shiftwidth=8 tabstop=8 expandtab:

 * :indentSize=8:tabSize=8:noTabs=true:

 */