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/*
* ptpv2.c
*
* IEEE 1588-2008 Precision Time Protocol (PTP) Version 2
*
* Copyright (C) 2023 - ntop.org
* Copyright (C) 2023 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_PTPV2
#include "ndpi_api.h"
#include "ndpi_private.h"
#define PTP_EVENT_MSG_PORT 319
#define PTP_GENERAL_MSG_PORT 320
static void ndpi_int_ptpv2_add_connection(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow)
{
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_PTPV2, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
static void ndpi_search_ptpv2_udp(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
NDPI_LOG_DBG(ndpi_struct, "search PTPv2\n");
/* PTPv2 header is 34 bytes long */
if (packet->payload_packet_len > 34) {
u_int16_t sport = ntohs(packet->udp->source);
u_int16_t dport = ntohs(packet->udp->dest);
if ((sport == PTP_EVENT_MSG_PORT && dport == PTP_EVENT_MSG_PORT) ||
(sport == PTP_GENERAL_MSG_PORT && dport == PTP_GENERAL_MSG_PORT))
{
/* Check PTP version and message type */
if (((packet->payload[0] & 0xF) < 0xF) && packet->payload[1] == 0x02) {
NDPI_LOG_INFO(ndpi_struct, "found PTPv2\n");
ndpi_int_ptpv2_add_connection(ndpi_struct, flow);
return;
}
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_ptpv2_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("PTPv2", ndpi_struct, *id,
NDPI_PROTOCOL_PTPV2,
ndpi_search_ptpv2_udp,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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