source: mainline/uspace/srv/inet/addrobj.c@ bd8bfc5a

/*
 * 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 inet
 * @{
 */
/**
 * @file
 * @brief
 */

#include <bitops.h>
#include <fibril_synch.h>
#include <io/log.h>
#include <ipc/loc.h>
#include <stdlib.h>

#include "addrobj.h"
#include "inet.h"
#include "inet_link.h"

static FIBRIL_MUTEX_INITIALIZE(addr_list_lock);
static LIST_INITIALIZE(addr_list);

static uint32_t inet_netmask(int bits)
{
        assert(bits >= 1);
        assert(bits < 32);

        return BIT_RANGE(uint32_t, 31, 31 - (bits - 1));
}

inet_addrobj_t *inet_addrobj_new(void)
{
        inet_addrobj_t *addr = calloc(1, sizeof(inet_addrobj_t));

        if (addr == NULL) {
                log_msg(LVL_ERROR, "Failed allocating address object. "
                    "Out of memory.");
                return NULL;
        }

        link_initialize(&addr->addr_list);

        return addr;
}

void inet_addrobj_delete(inet_addrobj_t *addr)
{
        free(addr);
}

void inet_addrobj_add(inet_addrobj_t *addr)
{
        fibril_mutex_lock(&addr_list_lock);
        list_append(&addr->addr_list, &addr_list);
        fibril_mutex_unlock(&addr_list_lock);
}

void inet_addrobj_remove(inet_addrobj_t *addr)
{
        fibril_mutex_lock(&addr_list_lock);
        list_remove(&addr->addr_list);
        fibril_mutex_unlock(&addr_list_lock);
}

/** Find address object matching address @a addr.
 *
 * @param addr  Address
 * @oaram find  iaf_net to find network (using mask),
 *              iaf_addr to find local address (exact match)
 */
inet_addrobj_t *inet_addrobj_find(inet_addr_t *addr, inet_addrobj_find_t find)
{
        uint32_t mask;

        log_msg(LVL_DEBUG, "inet_addrobj_find(%x)", (unsigned)addr->ipv4);

        fibril_mutex_lock(&addr_list_lock);

        list_foreach(addr_list, link) {
                inet_addrobj_t *naddr = list_get_instance(link,
                    inet_addrobj_t, addr_list);

                mask = inet_netmask(naddr->naddr.bits);
                if ((naddr->naddr.ipv4 & mask) == (addr->ipv4 & mask)) {
                        fibril_mutex_unlock(&addr_list_lock);
                        log_msg(LVL_DEBUG, "inet_addrobj_find: found %p",
                            addr);
                        return naddr;
                }
        }

        log_msg(LVL_DEBUG, "inet_addrobj_find: Not found");
        fibril_mutex_unlock(&addr_list_lock);

        return NULL;
}

/** Send datagram to directly reachable destination */
int inet_addrobj_send_dgram(inet_addrobj_t *addr, inet_dgram_t *dgram,
    uint8_t ttl, int df)
{
        inet_addr_t lsrc_addr;
        inet_addr_t *ldest_addr;

        lsrc_addr.ipv4 = addr->naddr.ipv4;
        ldest_addr = &dgram->dest;

        return inet_link_send_dgram(addr->ilink, &lsrc_addr, ldest_addr, dgram,
            ttl, df);
}

/** @}
 */