source: mainline/uspace/srv/net/udp/udp_inet.c

/*
 * Copyright (c) 2015 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup udp
 * @{
 */

/**
 * @file
 */

#include <errno.h>
#include <inet/inet.h>
#include <io/log.h>

#include "assoc.h"
#include "pdu.h"
#include "std.h"
#include "udp_inet.h"
#include "udp_type.h"

static errno_t udp_inet_ev_recv(inet_dgram_t *dgram);
static void udp_received_pdu(udp_pdu_t *pdu);

static inet_ev_ops_t udp_inet_ev_ops = {
        .recv = udp_inet_ev_recv
};

/** Received datagram callback */
static errno_t udp_inet_ev_recv(inet_dgram_t *dgram)
{
        udp_pdu_t *pdu;

        log_msg(LOG_DEFAULT, LVL_DEBUG, "udp_inet_ev_recv()");

        pdu = udp_pdu_new();
        pdu->iplink = dgram->iplink;
        pdu->data = dgram->data;
        pdu->data_size = dgram->size;

        pdu->src = dgram->src;
        pdu->dest = dgram->dest;

        udp_received_pdu(pdu);

        /* We don't want udp_pdu_delete() to free dgram->data */
        pdu->data = NULL;
        udp_pdu_delete(pdu);

        return EOK;
}

/** Transmit PDU over network layer. */
errno_t udp_transmit_pdu(udp_pdu_t *pdu)
{
        errno_t rc;
        inet_dgram_t dgram;

        log_msg(LOG_DEFAULT, LVL_DEBUG, "udp_transmit_pdu()");

        dgram.iplink = pdu->iplink;
        dgram.src = pdu->src;
        dgram.dest = pdu->dest;
        dgram.tos = 0;
        dgram.data = pdu->data;
        dgram.size = pdu->data_size;

        rc = inet_send(&dgram, INET_TTL_MAX, 0);
        if (rc != EOK)
                log_msg(LOG_DEFAULT, LVL_ERROR, "Failed to transmit PDU.");

        return rc;
}

/** Process received PDU. */
static void udp_received_pdu(udp_pdu_t *pdu)
{
        udp_msg_t *dmsg;
        inet_ep2_t rident;

        log_msg(LOG_DEFAULT, LVL_DEBUG, "udp_received_pdu()");

        if (udp_pdu_decode(pdu, &rident, &dmsg) != EOK) {
                log_msg(LOG_DEFAULT, LVL_WARN, "Not enough memory. PDU dropped.");
                return;
        }

        /*
         * Insert decoded message into appropriate receive queue.
         * This transfers ownership of dmsg to the callee, we do not
         * free it.
         */
        udp_assoc_received(&rident, dmsg);
}

errno_t udp_inet_init(void)
{
        errno_t rc;

        log_msg(LOG_DEFAULT, LVL_DEBUG, "udp_inet_init()");

        rc = inet_init(IP_PROTO_UDP, &udp_inet_ev_ops);
        if (rc != EOK) {
                log_msg(LOG_DEFAULT, LVL_ERROR, "Failed connecting to internet service.");
                return ENOENT;
        }

        return EOK;
}

/** Get source address.
 *
 * @param remote Remote address
 * @param tos Type of service
 * @param local Place to store local address
 * @return EOK on success or an error code
 */
errno_t udp_get_srcaddr(inet_addr_t *remote, uint8_t tos, inet_addr_t *local)
{
        return inet_get_srcaddr(remote, tos, local);
}

/** Transmit message over network layer. */
errno_t udp_transmit_msg(inet_ep2_t *epp, udp_msg_t *msg)
{
        udp_pdu_t *pdu;
        errno_t rc;

        log_msg(LOG_DEFAULT, LVL_DEBUG, "udp_transmit_msg()");

        rc = udp_pdu_encode(epp, msg, &pdu);
        if (rc != EOK) {
                log_msg(LOG_DEFAULT, LVL_ERROR, "Failed encoding PDU");
                return rc;
        }

        rc = udp_transmit_pdu(pdu);
        udp_pdu_delete(pdu);

        return rc;
}

/**
 * @}
 */