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/*
* knxnet_ip.c
*
* KNXnet/IP
*
* 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_KNXNET_IP
#include "ndpi_api.h"
#include "ndpi_private.h"
enum knx_service_families {
KNX_SERVICE_CORE = 0x02,
KNX_SERVICE_MANAGEMENT = 0x03,
KNX_SERVICE_TUNNELING = 0x04,
KNX_SERVICE_ROUTING = 0x05,
KNX_SERVICE_REMOTE_LOGGING = 0x06,
KNX_SERVICE_REMOTE_DIAG_AND_CONFIG = 0x07,
KNX_SERVICE_OBJECT_SERVER = 0x08,
KNX_SERVICE_SECURITY = 0x09
};
static inline int is_valid_knxnet_ip_service_id(u_int16_t service_id) {
u_int8_t service_family = service_id >> 8;
u_int8_t service_code = service_id & 0xFF;
switch (service_family)
{
case KNX_SERVICE_CORE:
return (service_code > 0 && service_code < 0xD);
case KNX_SERVICE_MANAGEMENT:
return (service_code >= 0x10 && service_code <= 0x11);
case KNX_SERVICE_TUNNELING:
return (service_code >= 0x20 && service_code <= 0x25);
case KNX_SERVICE_ROUTING:
return (service_code >= 0x30 && service_code <= 0x33);
case KNX_SERVICE_REMOTE_DIAG_AND_CONFIG:
return (service_code >= 0x40 && service_code <= 0x43);
case KNX_SERVICE_SECURITY:
return (service_code >= 0x50 && service_code <= 0x55);
default:
return 0;
}
}
static void ndpi_int_knxnet_ip_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
NDPI_LOG_INFO(ndpi_struct, "found KNXnet/IP\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_KNXNET_IP, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
static void ndpi_search_knxnet_ip(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 KNXnet/IP\n");
if ((packet->payload_packet_len < 10) || (packet->payload[0] != 0x06) ||
(packet->payload[1] != 0x10))
{
goto not_knxnet_ip;
}
u_int16_t service_id = ntohs(get_u_int16_t(packet->payload, 2));
u_int16_t total_length = ntohs(get_u_int16_t(packet->payload, 4));
if (!is_valid_knxnet_ip_service_id(service_id))
{
goto not_knxnet_ip;
}
if (total_length == packet->payload_packet_len)
{
ndpi_int_knxnet_ip_add_connection(ndpi_struct, flow);
return;
}
/* Could it be a TCP packet containing multiple messages? */
if (packet->tcp != NULL)
{
if ((total_length + 10) > packet->payload_packet_len)
{
goto not_knxnet_ip;
}
if (ntohs(get_u_int16_t(packet->payload, total_length)) == 0x610 &&
is_valid_knxnet_ip_service_id(ntohs(get_u_int16_t(packet->payload, total_length+2))))
{
ndpi_int_knxnet_ip_add_connection(ndpi_struct, flow);
return;
}
}
not_knxnet_ip:
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_knxnet_ip_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("KNXnet_IP", ndpi_struct, *id,
NDPI_PROTOCOL_KNXNET_IP,
ndpi_search_knxnet_ip,
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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