/*
 * lisp.c
 *
 * Copyright (C) 2017-18 - 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"

#define LISP_PORT  4341
#define LISP_PORT1 4342

static void ndpi_int_lisp_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
        struct ndpi_flow_struct *flow, u_int8_t due_to_correlation)
{
    ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_LISP);
}

static void ndpi_check_lisp(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
    struct ndpi_packet_struct *packet = &flow->packet;

    if(packet->udp != NULL) {

        u_int16_t lisp_port = htons(LISP_PORT);
        u_int16_t lisp_port1 = htons(LISP_PORT1);

        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, 0);
            return;

        }
    }

    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}

void ndpi_search_lisp(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
    struct ndpi_packet_struct *packet = &flow->packet;

    NDPI_LOG_DBG(ndpi_struct, "search lisp\n");

    /* skip marked packets */
    if (packet->detected_protocol != NDPI_PROTOCOL_LISP) {

        ndpi_check_lisp(ndpi_struct, flow);

    }
}


void init_lisp_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
    ndpi_set_bitmask_protocol_detection("LISP", ndpi_struct, detection_bitmask, *id,
            NDPI_PROTOCOL_LISP,
            ndpi_search_lisp,
            NDPI_SELECTION_BITMASK_PROTOCOL_UDP_WITH_PAYLOAD,
            SAVE_DETECTION_BITMASK_AS_UNKNOWN,
            ADD_TO_DETECTION_BITMASK);
    *id += 1;
}

