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/*******************************************************************************

  Copyright(c) 2004-2005 Intel Corporation. All rights reserved.

  Portions of this file are based on the WEP enablement code provided by the

  Host AP project hostap-drivers v0.1.3

  Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen

  <j@w1.fi>

  Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi>

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

  under the terms of version 2 of the GNU General Public License as

  published by the Free Software Foundation.

  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, write to the Free Software Foundation, Inc., 59

  Temple Place - Suite 330, Boston, MA  02111-1307, USA.

  The full GNU General Public License is included in this distribution in the

  file called LICENSE.

  Contact Information:

  James P. Ketrenos <ipw2100-admin@linux.intel.com>

  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

*******************************************************************************/

#include <linux/compiler.h>

#include <linux/errno.h>

#include <linux/if_arp.h>

#include <linux/in6.h>

#include <linux/in.h>

#include <linux/ip.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/netdevice.h>

#include <linux/proc_fs.h>

#include <linux/skbuff.h>

#include <linux/slab.h>

#include <linux/tcp.h>

#include <linux/types.h>

#include <linux/wireless.h>

#include <linux/etherdevice.h>

#include <asm/uaccess.h>

#include <net/net_namespace.h>

#include <net/arp.h>

#include <net/ieee80211.h>

#define DRV_DESCRIPTION "802.11 data/management/control stack"

#define DRV_NAME        "ieee80211"

#define DRV_VERSION     IEEE80211_VERSION

#define DRV_COPYRIGHT   "Copyright (C) 2004-2005 Intel Corporation <jketreno@linux.intel.com>"

MODULE_VERSION(DRV_VERSION);

MODULE_DESCRIPTION(DRV_DESCRIPTION);

MODULE_AUTHOR(DRV_COPYRIGHT);

MODULE_LICENSE("GPL");

static int ieee80211_networks_allocate(struct ieee80211_device *ieee)

{

        if (ieee->networks)

                return 0;

        ieee->networks =

            kzalloc(MAX_NETWORK_COUNT * sizeof(struct ieee80211_network),

                    GFP_KERNEL);

        if (!ieee->networks) {

                printk(KERN_WARNING "%s: Out of memory allocating beacons\n",

                       ieee->dev->name);

                return -ENOMEM;

        }

        return 0;

}

void ieee80211_network_reset(struct ieee80211_network *network)

{

        if (!network)

                return;

        if (network->ibss_dfs) {

                kfree(network->ibss_dfs);

                network->ibss_dfs = NULL;

        }

}

static inline void ieee80211_networks_free(struct ieee80211_device *ieee)

{

        int i;

        if (!ieee->networks)

                return;

        for (i = 0; i < MAX_NETWORK_COUNT; i++)

                if (ieee->networks[i].ibss_dfs)

                        kfree(ieee->networks[i].ibss_dfs);

        kfree(ieee->networks);

        ieee->networks = NULL;

}

static void ieee80211_networks_initialize(struct ieee80211_device *ieee)

{

        int i;

        INIT_LIST_HEAD(&ieee->network_free_list);

        INIT_LIST_HEAD(&ieee->network_list);

        for (i = 0; i < MAX_NETWORK_COUNT; i++)

                list_add_tail(&ieee->networks[i].list,

                              &ieee->network_free_list);

}

static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)

{

        if ((new_mtu < 68) || (new_mtu > IEEE80211_DATA_LEN))

                return -EINVAL;

        dev->mtu = new_mtu;

        return 0;

}

static struct net_device_stats *ieee80211_generic_get_stats(

        struct net_device *dev)

{

        struct ieee80211_device *ieee = netdev_priv(dev);

        return &ieee->stats;

}

struct net_device *alloc_ieee80211(int sizeof_priv)

{

        struct ieee80211_device *ieee;

        struct net_device *dev;

        int err;

        IEEE80211_DEBUG_INFO("Initializing...\n");

        dev = alloc_etherdev(sizeof(struct ieee80211_device) + sizeof_priv);

        if (!dev) {

                IEEE80211_ERROR("Unable to allocate network device.\n");

                goto failed;

        }

        ieee = netdev_priv(dev);

        dev->hard_start_xmit = ieee80211_xmit;

        dev->change_mtu = ieee80211_change_mtu;

        /* Drivers are free to override this if the generic implementation

         * does not meet their needs. */

        dev->get_stats = ieee80211_generic_get_stats;

        ieee->dev = dev;

        err = ieee80211_networks_allocate(ieee);

        if (err) {

                IEEE80211_ERROR("Unable to allocate beacon storage: %d\n", err);

                goto failed;

        }

        ieee80211_networks_initialize(ieee);

        /* Default fragmentation threshold is maximum payload size */

        ieee->fts = DEFAULT_FTS;

        ieee->rts = DEFAULT_FTS;

        ieee->scan_age = DEFAULT_MAX_SCAN_AGE;

        ieee->open_wep = 1;

        /* Default to enabling full open WEP with host based encrypt/decrypt */

        ieee->host_encrypt = 1;

        ieee->host_decrypt = 1;

        ieee->host_mc_decrypt = 1;

        /* Host fragementation in Open mode. Default is enabled.

         * Note: host fragmentation is always enabled if host encryption

         * is enabled. For cards can do hardware encryption, they must do

         * hardware fragmentation as well. So we don't need a variable

         * like host_enc_frag. */

        ieee->host_open_frag = 1;

        ieee->ieee802_1x = 1;   /* Default to supporting 802.1x */

        INIT_LIST_HEAD(&ieee->crypt_deinit_list);

        init_timer(&ieee->crypt_deinit_timer);

        ieee->crypt_deinit_timer.data = (unsigned long)ieee;

        ieee->crypt_deinit_timer.function = ieee80211_crypt_deinit_handler;

        ieee->crypt_quiesced = 0;

        spin_lock_init(&ieee->lock);

        ieee->wpa_enabled = 0;

        ieee->drop_unencrypted = 0;

        ieee->privacy_invoked = 0;

        return dev;

      failed:

        if (dev)

                free_netdev(dev);

        return NULL;

}

void free_ieee80211(struct net_device *dev)

{

        struct ieee80211_device *ieee = netdev_priv(dev);

        int i;

        ieee80211_crypt_quiescing(ieee);

        del_timer_sync(&ieee->crypt_deinit_timer);

        ieee80211_crypt_deinit_entries(ieee, 1);

        for (i = 0; i < WEP_KEYS; i++) {

                struct ieee80211_crypt_data *crypt = ieee->crypt[i];

                if (crypt) {

                        if (crypt->ops) {

                                crypt->ops->deinit(crypt->priv);

                                module_put(crypt->ops->owner);

                        }

                        kfree(crypt);

                        ieee->crypt[i] = NULL;

                }

        }

        ieee80211_networks_free(ieee);

        free_netdev(dev);

}

#ifdef CONFIG_IEEE80211_DEBUG

static int debug = 0;

u32 ieee80211_debug_level = 0;

EXPORT_SYMBOL_GPL(ieee80211_debug_level);

static struct proc_dir_entry *ieee80211_proc = NULL;

static int show_debug_level(char *page, char **start, off_t offset,

                            int count, int *eof, void *data)

{

        return snprintf(page, count, "0x%08X\n", ieee80211_debug_level);

}

static int store_debug_level(struct file *file, const char __user * buffer,

                             unsigned long count, void *data)

{

        char buf[] = "0x00000000\n";

        unsigned long len = min((unsigned long)sizeof(buf) - 1, count);

        unsigned long val;

        if (copy_from_user(buf, buffer, len))

                return count;

        buf[len] = 0;

        if (sscanf(buf, "%li", &val) != 1)

                printk(KERN_INFO DRV_NAME

                       ": %s is not in hex or decimal form.\n", buf);

        else

                ieee80211_debug_level = val;

        return strnlen(buf, len);

}

#endif                          /* CONFIG_IEEE80211_DEBUG */

static int __init ieee80211_init(void)

{

#ifdef CONFIG_IEEE80211_DEBUG

        struct proc_dir_entry *e;

        ieee80211_debug_level = debug;

        ieee80211_proc = proc_mkdir(DRV_NAME, init_net.proc_net);

        if (ieee80211_proc == NULL) {

                IEEE80211_ERROR("Unable to create " DRV_NAME

                                " proc directory\n");

                return -EIO;

        }

        e = create_proc_entry("debug_level", S_IFREG | S_IRUGO | S_IWUSR,

                              ieee80211_proc);

        if (!e) {

                remove_proc_entry(DRV_NAME, init_net.proc_net);

                ieee80211_proc = NULL;

                return -EIO;

        }

        e->read_proc = show_debug_level;

        e->write_proc = store_debug_level;

        e->data = NULL;

#endif                          /* CONFIG_IEEE80211_DEBUG */

        printk(KERN_INFO DRV_NAME ": " DRV_DESCRIPTION ", " DRV_VERSION "\n");

        printk(KERN_INFO DRV_NAME ": " DRV_COPYRIGHT "\n");

        return 0;

}

static void __exit ieee80211_exit(void)

{

#ifdef CONFIG_IEEE80211_DEBUG

        if (ieee80211_proc) {

                remove_proc_entry("debug_level", ieee80211_proc);

                remove_proc_entry(DRV_NAME, init_net.proc_net);

                ieee80211_proc = NULL;

        }

#endif                          /* CONFIG_IEEE80211_DEBUG */

}

#ifdef CONFIG_IEEE80211_DEBUG

#include <linux/moduleparam.h>

module_param(debug, int, 0444);

MODULE_PARM_DESC(debug, "debug output mask");

#endif                          /* CONFIG_IEEE80211_DEBUG */

module_exit(ieee80211_exit);

module_init(ieee80211_init);

const char *escape_essid(const char *essid, u8 essid_len)

{

        static char escaped[IW_ESSID_MAX_SIZE * 2 + 1];

        const char *s = essid;

        char *d = escaped;

        if (ieee80211_is_empty_essid(essid, essid_len)) {

                memcpy(escaped, "<hidden>", sizeof("<hidden>"));

                return escaped;

        }

        essid_len = min(essid_len, (u8) IW_ESSID_MAX_SIZE);

        while (essid_len--) {

                if (*s == '\0') {

                        *d++ = '\\';

                        *d++ = '0';

                        s++;

                } else {

                        *d++ = *s++;

                }

        }

        *d = '\0';

        return escaped;

}

EXPORT_SYMBOL(alloc_ieee80211);

EXPORT_SYMBOL(free_ieee80211);

EXPORT_SYMBOL(escape_essid);