source: mainline/uspace/srv/udp/udp_inet.c@ ee603c4

/*
 * Copyright (c) 2012 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 <bitops.h>
#include <byteorder.h>
#include <errno.h>
#include <inet/inet.h>
#include <io/log.h>
#include <stdio.h>
#include <task.h>

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

static int udp_inet_ev_recv(inet_dgram_t *dgram);
//static void tcp_received_pdu(tcp_pdu_t *pdu);

static inet_ev_ops_t udp_inet_ev_ops = {
        .recv = udp_inet_ev_recv
};

/** Received datagram callback */
static int udp_inet_ev_recv(inet_dgram_t *dgram)
{
        uint8_t *pdu_raw;
        size_t pdu_raw_size;

        log_msg(LVL_DEBUG, "udp_inet_ev_recv()");

        pdu_raw = dgram->data;
        pdu_raw_size = dgram->size;

        (void)pdu_raw;
        (void)pdu_raw_size;
        /* Split into header and payload. */
/*
        log_msg(LVL_DEBUG, "tcp_inet_ev_recv() - split header/payload");

        tcp_pdu_t *pdu;
        size_t hdr_size;
        tcp_header_t *hdr;
        uint32_t data_offset;

        if (pdu_raw_size < sizeof(tcp_header_t)) {
                log_msg(LVL_WARN, "pdu_raw_size = %zu < sizeof(tcp_header_t) = %zu",
                    pdu_raw_size, sizeof(tcp_header_t));
                return EINVAL;
        }

        hdr = (tcp_header_t *)pdu_raw;
        data_offset = BIT_RANGE_EXTRACT(uint32_t, DF_DATA_OFFSET_h, DF_DATA_OFFSET_l,
            uint16_t_be2host(hdr->doff_flags));

        hdr_size = sizeof(uint32_t) * data_offset;

        if (pdu_raw_size < hdr_size) {
                log_msg(LVL_WARN, "pdu_raw_size = %zu < hdr_size = %zu",
                    pdu_raw_size, hdr_size);
                return EINVAL;
        }

        if (hdr_size < sizeof(tcp_header_t)) {
                log_msg(LVL_WARN, "hdr_size = %zu < sizeof(tcp_header_t) = %zu",
                    hdr_size, sizeof(tcp_header_t));            return EINVAL;
        }

        log_msg(LVL_DEBUG, "pdu_raw_size=%zu, hdr_size=%zu",
            pdu_raw_size, hdr_size);
        pdu = tcp_pdu_create(pdu_raw, hdr_size, pdu_raw + hdr_size,
            pdu_raw_size - hdr_size);
        if (pdu == NULL) {
                log_msg(LVL_WARN, "Failed creating PDU. Dropped.");
                return ENOMEM;
        }

        pdu->src_addr.ipv4 = dgram->src.ipv4;
        pdu->dest_addr.ipv4 = dgram->dest.ipv4;
        log_msg(LVL_DEBUG, "src: 0x%08x, dest: 0x%08x",
            pdu->src_addr.ipv4, pdu->dest_addr.ipv4);

        tcp_received_pdu(pdu);
        tcp_pdu_delete(pdu);
*/
        return EOK;
}

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

        dgram.src.ipv4 = pdu->src.ipv4;
        dgram.dest.ipv4 = pdu->dest.ipv4;
        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(LVL_ERROR, "Failed to transmit PDU.");

        return rc;
}

/** Process received PDU. */
/*
static void tcp_received_pdu(tcp_pdu_t *pdu)
{
        tcp_segment_t *dseg;
        tcp_sockpair_t rident;

        log_msg(LVL_DEBUG, "tcp_received_pdu()");

        if (tcp_pdu_decode(pdu, &rident, &dseg) != EOK) {
                log_msg(LVL_WARN, "Not enough memory. PDU dropped.");
                return;
        }
*/
        /* Insert decoded segment into rqueue */
/*      tcp_rqueue_insert_seg(&rident, dseg);
}
*/
int udp_inet_init(void)
{
        int rc;

        log_msg(LVL_DEBUG, "udp_inet_init()");

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

        return EOK;
}

/**
 * @}
 */