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/*
* list.c
*
* Copyright (C) 2017-22 - 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_LISP
#include "ndpi_api.h"
#include "ndpi_private.h"
#define LISP_PORT 4341 /* Only UDP */
#define LISP_PORT1 4342 /* TCP and UDP */
static void ndpi_int_lisp_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_LISP, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
static void ndpi_check_lisp(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
u_int16_t lisp_port1 = htons(LISP_PORT1);
u_int16_t lisp_port = htons(LISP_PORT);
if(packet->udp != NULL) {
if((packet->udp->source == lisp_port && packet->udp->dest == lisp_port) ||
(packet->udp->source == lisp_port1 && packet->udp->dest == lisp_port1)) {
NDPI_LOG_INFO(ndpi_struct, "found lisp\n");
ndpi_int_lisp_add_connection(ndpi_struct, flow);
return;
}
} else {
/* See draft-kouvelas-lisp-map-server-reliable-transport-07 */
if(packet->tcp->source == lisp_port1 ||
packet->tcp->dest == lisp_port1) {
if(packet->payload_packet_len >= 8) {
u_int16_t msg_len = ntohs(*(u_int16_t *)&packet->payload[2]);
if(msg_len >= packet->payload_packet_len &&
/* End marker: we don't handle fragmented messages */
packet->payload[packet->payload_packet_len - 1] == 0xE9 &&
packet->payload[packet->payload_packet_len - 2] == 0xAD &&
packet->payload[packet->payload_packet_len - 3] == 0xAC &&
packet->payload[packet->payload_packet_len - 4] == 0x9F) {
NDPI_LOG_INFO(ndpi_struct, "found lisp\n");
ndpi_int_lisp_add_connection(ndpi_struct, flow);
return;
}
}
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
static void ndpi_search_lisp(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
NDPI_LOG_DBG(ndpi_struct, "search lisp\n");
ndpi_check_lisp(ndpi_struct, flow);
}
void init_lisp_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("LISP", ndpi_struct, *id,
NDPI_PROTOCOL_LISP,
ndpi_search_lisp,
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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