linux-imx

/*

 * NetLabel Network Address Lists

 *

 * This file contains network address list functions used to manage ordered

 * lists of network addresses for use by the NetLabel subsystem.  The NetLabel

 * system manages static and dynamic label mappings for network protocols such

 * as CIPSO and RIPSO.

 *

 * Author: Paul Moore <paul@paul-moore.com>

 *

 */

​

/*

 * (c) Copyright Hewlett-Packard Development Company, L.P., 2008

 *

 * This program is free software;  you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program;  if not, see <http://www.gnu.org/licenses/>.

 *

 */

​

#include <linux/types.h>

#include <linux/rcupdate.h>

#include <linux/list.h>

#include <linux/spinlock.h>

#include <linux/in.h>

#include <linux/in6.h>

#include <linux/ip.h>

#include <linux/ipv6.h>

#include <net/ip.h>

#include <net/ipv6.h>

#include <linux/audit.h>

​

#include "netlabel_addrlist.h"

​

/*

 * Address List Functions

 */

​

/**

 * netlbl_af4list_search - Search for a matching IPv4 address entry

 * @addr: IPv4 address

 * @head: the list head

 *

 * Description:

 * Searches the IPv4 address list given by @head.  If a matching address entry

 * is found it is returned, otherwise NULL is returned.  The caller is

 * responsible for calling the rcu_read_[un]lock() functions.

 *

 */

struct netlbl_af4list *netlbl_af4list_search(__be32 addr,

                         struct list_head *head)

{

    struct netlbl_af4list *iter;

​

    list_for_each_entry_rcu(iter, head, list)

        if (iter->valid && (addr & iter->mask) == iter->addr)

            return iter;

​

    return NULL;

}

​

/**

 * netlbl_af4list_search_exact - Search for an exact IPv4 address entry

 * @addr: IPv4 address

 * @mask: IPv4 address mask

 * @head: the list head

 *

 * Description:

 * Searches the IPv4 address list given by @head.  If an exact match if found

 * it is returned, otherwise NULL is returned.  The caller is responsible for

 * calling the rcu_read_[un]lock() functions.

 *

 */

struct netlbl_af4list *netlbl_af4list_search_exact(__be32 addr,

                           __be32 mask,

                           struct list_head *head)

{

    struct netlbl_af4list *iter;

​

    list_for_each_entry_rcu(iter, head, list)

        if (iter->valid && iter->addr == addr && iter->mask == mask)

            return iter;