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/*
* ldp.c
*
* Label Distribution Protocol
*
* Copyright (C) 2024 - ntop.org
* Copyright (C) 2024 - V.G <v.gavrilov@securitycode.ru>
*
* This file is part of nDPI, an open source deep packet inspection
* library based on the OpenDPI and PACE technology by ipoque GmbH
*
* nDPI is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* nDPI is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with nDPI. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "ndpi_protocol_ids.h"
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_LDP
#include "ndpi_api.h"
#include "ndpi_private.h"
enum ldp_message_types
{
LDP_INITIALIZATION = 0x0200,
LDP_KEEPALIVE = 0x0201,
LDP_CAPABILITY = 0x0202,
LDP_ADDRESS = 0x0300,
LDP_ADDRESS_WITHDRAWAL = 0x0301,
LDP_LABEL_MAPPING = 0x0400,
LDP_LABEL_REQUEST = 0x0401,
LDP_LABEL_WITHDRAWAL = 0x0402,
LDP_LABEL_RELEASE = 0x0403,
LDP_LABEL_ABORT_REQUEST = 0x0404,
LDP_CALL_SETUP = 0x0500,
LDP_CALL_RELEASE = 0x0501,
LDP_RG_CONNECT_MESSAGE = 0x0700,
LDP_RG_DISCONNECT_MESSAGE = 0x0701,
LDP_RG_NOTIFICATION_MESSAGE = 0x0702,
LDP_RG_APPLICATION_DATA_MESSAGE = 0x0703
};
static void ndpi_int_ldp_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
NDPI_LOG_INFO(ndpi_struct, "found LDP\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_LDP,
NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
static void ndpi_search_ldp(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct const * const packet = &ndpi_struct->packet;
NDPI_LOG_DBG(ndpi_struct, "search LDP\n");
if (packet->payload_packet_len > 19 &&
ntohs(get_u_int16_t(packet->payload, 0)) == 1 &&
ntohs(get_u_int16_t(packet->payload, 2)) == (u_int16_t)(packet->payload_packet_len-4))
{
/* LDP Hello Message */
if (packet->udp != NULL &&
ntohs(get_u_int16_t(packet->payload, 10)) == 0x0100)
{
ndpi_int_ldp_add_connection(ndpi_struct, flow);
return;
}
else if (packet->tcp != NULL) {
u_int16_t ldp_msg_type = ntohs(get_u_int16_t(packet->payload, 10));
/* Vendor defined message types */
if (ldp_msg_type >= 0x3E00 && ldp_msg_type <= 0x3EFF) {
ndpi_int_ldp_add_connection(ndpi_struct, flow);
return;
}
switch (ldp_msg_type) {
case LDP_INITIALIZATION:
case LDP_KEEPALIVE:
case LDP_CAPABILITY:
case LDP_ADDRESS:
case LDP_ADDRESS_WITHDRAWAL:
case LDP_LABEL_MAPPING:
case LDP_LABEL_REQUEST:
case LDP_LABEL_WITHDRAWAL:
case LDP_LABEL_RELEASE:
case LDP_LABEL_ABORT_REQUEST:
case LDP_CALL_SETUP:
case LDP_CALL_RELEASE:
case LDP_RG_CONNECT_MESSAGE:
case LDP_RG_DISCONNECT_MESSAGE:
case LDP_RG_NOTIFICATION_MESSAGE:
case LDP_RG_APPLICATION_DATA_MESSAGE:
ndpi_int_ldp_add_connection(ndpi_struct, flow);
return;
default:
break;
}
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_ldp_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("LDP", ndpi_struct, *id,
NDPI_PROTOCOL_LDP,
ndpi_search_ldp,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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