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/*
* bfd.c
*
* Bidirectional Forwarding Detection
*
* 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_BFD
#include "ndpi_api.h"
#include "ndpi_private.h"
static void ndpi_int_bfd_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
NDPI_LOG_INFO(ndpi_struct, "found BFD\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_BFD,
NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
static void ndpi_search_bfd(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct const * const packet = &ndpi_struct->packet;
/* BFD echo message */
if (packet->payload_packet_len == 12 && ntohs(packet->udp->dest) == 3785) {
if (ndpi_ntohll(get_u_int64_t(packet->payload, 0)) == 1 &&
ntohs(get_u_int16_t(packet->payload, packet->payload_packet_len-2)) == 0)
{
ndpi_int_bfd_add_connection(ndpi_struct, flow);
return;
}
}
/* BFD control message */
if ((packet->payload_packet_len > 23 && packet->payload_packet_len <= 100) &&
ntohs(packet->udp->dest) == 3784)
{
if (((packet->payload[0] & 0xE0) >> 5) < 2 &&
packet->payload[3] == (u_int8_t)packet->payload_packet_len)
{
ndpi_int_bfd_add_connection(ndpi_struct, flow);
return;
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_bfd_dissector(struct ndpi_detection_module_struct *ndpi_struct,
u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("BFD", ndpi_struct, *id,
NDPI_PROTOCOL_BFD,
ndpi_search_bfd,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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