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/*
* teredo.c
*
* Copyright (C) 2015-22 - ntop.org
*
* 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_TEREDO
#include "ndpi_api.h"
#include "ndpi_private.h"
/* https://en.wikipedia.org/wiki/Teredo_tunneling */
static void ndpi_search_teredo(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 teredo\n");
if(packet->udp
&& packet->iph
&& ((ntohl(packet->iph->daddr) & 0xF0000000) != 0xE0000000 /* Not a multicast address */)
&& ((ntohs(packet->udp->source) == 3544) || (ntohs(packet->udp->dest) == 3544))
&& (packet->payload_packet_len >= 40 /* IPv6 header */)) {
NDPI_LOG_INFO(ndpi_struct,"found teredo\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_TEREDO, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
} else {
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
}
void init_teredo_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("TEREDO", ndpi_struct, *id,
NDPI_PROTOCOL_TEREDO,
ndpi_search_teredo,
/* Teredo is inherently IPV4 only */
NDPI_SELECTION_BITMASK_PROTOCOL_UDP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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