libipw_module.c

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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
  <[email protected]>
  Copyright (c) 2002-2003, Jouni Malinen <[email protected]>

  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:
  Intel Linux Wireless <[email protected]>
  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 "libipw.h"

#define DRV_DESCRIPTION "802.11 data/management/control stack"
#define DRV_NAME        "libipw"
#define DRV_PROCNAME    "ieee80211"
#define DRV_VERSION LIBIPW_VERSION
#define DRV_COPYRIGHT   "Copyright (C) 2004-2005 Intel Corporation <[email protected]>"

MODULE_VERSION(DRV_VERSION);
MODULE_DESCRIPTION(DRV_DESCRIPTION);
MODULE_AUTHOR(DRV_COPYRIGHT);
MODULE_LICENSE("GPL");

static struct cfg80211_ops libipw_config_ops = { };
static void *libipw_wiphy_privid = &libipw_wiphy_privid;

static int libipw_networks_allocate(struct libipw_device *ieee)
{
    int i, j;

    for (i = 0; i < MAX_NETWORK_COUNT; i++) {
        ieee->networks[i] = kzalloc(sizeof(struct libipw_network),
                        GFP_KERNEL);
        if (!ieee->networks[i]) {
            LIBIPW_ERROR("Out of memory allocating beacons\n");
            for (j = 0; j < i; j++)
                kfree(ieee->networks[j]);
            return -ENOMEM;
        }
    }

    return 0;
}

void libipw_network_reset(struct libipw_network *network)
{
    if (!network)
        return;

    if (network->ibss_dfs) {
        kfree(network->ibss_dfs);
        network->ibss_dfs = NULL;
    }
}

static inline void libipw_networks_free(struct libipw_device *ieee)
{
    int i;

    for (i = 0; i < MAX_NETWORK_COUNT; i++) {
        if (ieee->networks[i]->ibss_dfs)
            kfree(ieee->networks[i]->ibss_dfs);
        kfree(ieee->networks[i]);
    }
}

void libipw_networks_age(struct libipw_device *ieee,
                            unsigned long age_secs)
{
    struct libipw_network *network = NULL;
    unsigned long flags;
    unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);

    spin_lock_irqsave(&ieee->lock, flags);
    list_for_each_entry(network, &ieee->network_list, list) {
        network->last_scanned -= age_jiffies;
    }
    spin_unlock_irqrestore(&ieee->lock, flags);
}
EXPORT_SYMBOL(libipw_networks_age);

static void libipw_networks_initialize(struct libipw_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);
}

int libipw_change_mtu(struct net_device *dev, int new_mtu)
{
    if ((new_mtu < 68) || (new_mtu > LIBIPW_DATA_LEN))
        return -EINVAL;
    dev->mtu = new_mtu;
    return 0;
}
EXPORT_SYMBOL(libipw_change_mtu);

struct net_device *alloc_libipw(int sizeof_priv, int monitor)
{
    struct libipw_device *ieee;
    struct net_device *dev;
    int err;

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

    dev = alloc_etherdev(sizeof(struct libipw_device) + sizeof_priv);
    if (!dev)
        goto failed;

    ieee = netdev_priv(dev);

    ieee->dev = dev;

    if (!monitor) {
        ieee->wdev.wiphy = wiphy_new(&libipw_config_ops, 0);
        if (!ieee->wdev.wiphy) {
            LIBIPW_ERROR("Unable to allocate wiphy.\n");
            goto failed_free_netdev;
        }

        ieee->dev->ieee80211_ptr = &ieee->wdev;
        ieee->wdev.iftype = NL80211_IFTYPE_STATION;

        /* Fill-out wiphy structure bits we know...  Not enough info
           here to call set_wiphy_dev or set MAC address or channel info
           -- have to do that in ->ndo_init... */
        ieee->wdev.wiphy->privid = libipw_wiphy_privid;

        ieee->wdev.wiphy->max_scan_ssids = 1;
        ieee->wdev.wiphy->max_scan_ie_len = 0;
        ieee->wdev.wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION)
                        | BIT(NL80211_IFTYPE_ADHOC);
    }

    err = libipw_networks_allocate(ieee);
    if (err) {
        LIBIPW_ERROR("Unable to allocate beacon storage: %d\n", err);
        goto failed_free_wiphy;
    }
    libipw_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 fragmentation 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 */

    spin_lock_init(&ieee->lock);

    lib80211_crypt_info_init(&ieee->crypt_info, dev->name, &ieee->lock);

    ieee->wpa_enabled = 0;
    ieee->drop_unencrypted = 0;
    ieee->privacy_invoked = 0;

    return dev;

failed_free_wiphy:
    if (!monitor)
        wiphy_free(ieee->wdev.wiphy);
failed_free_netdev:
    free_netdev(dev);
failed:
    return NULL;
}
EXPORT_SYMBOL(alloc_libipw);

void free_libipw(struct net_device *dev, int monitor)
{
    struct libipw_device *ieee = netdev_priv(dev);

    lib80211_crypt_info_free(&ieee->crypt_info);

    libipw_networks_free(ieee);

    /* free cfg80211 resources */
    if (!monitor)
        wiphy_free(ieee->wdev.wiphy);

    free_netdev(dev);
}
EXPORT_SYMBOL(free_libipw);

#ifdef CONFIG_LIBIPW_DEBUG

static int debug = 0;
u32 libipw_debug_level = 0;
EXPORT_SYMBOL_GPL(libipw_debug_level);
static struct proc_dir_entry *libipw_proc = NULL;

static int debug_level_proc_show(struct seq_file *m, void *v)
{
    seq_printf(m, "0x%08X\n", libipw_debug_level);
    return 0;
}

static int debug_level_proc_open(struct inode *inode, struct file *file)
{
    return single_open(file, debug_level_proc_show, NULL);
}

static ssize_t debug_level_proc_write(struct file *file,
        const char __user *buffer, size_t count, loff_t *pos)
{
    char buf[] = "0x00000000\n";
    size_t len = min(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
        libipw_debug_level = val;

    return strnlen(buf, len);
}

static const struct file_operations debug_level_proc_fops = {
    .owner      = THIS_MODULE,
    .open       = debug_level_proc_open,
    .read       = seq_read,
    .llseek     = seq_lseek,
    .release    = single_release,
    .write      = debug_level_proc_write,
};
#endif              /* CONFIG_LIBIPW_DEBUG */

static int __init libipw_init(void)
{
#ifdef CONFIG_LIBIPW_DEBUG
    struct proc_dir_entry *e;

    libipw_debug_level = debug;
    libipw_proc = proc_mkdir(DRV_PROCNAME, init_net.proc_net);
    if (libipw_proc == NULL) {
        LIBIPW_ERROR("Unable to create " DRV_PROCNAME
                " proc directory\n");
        return -EIO;
    }
    e = proc_create("debug_level", S_IRUGO | S_IWUSR, libipw_proc,
            &debug_level_proc_fops);
    if (!e) {
        remove_proc_entry(DRV_PROCNAME, init_net.proc_net);
        libipw_proc = NULL;
        return -EIO;
    }
#endif              /* CONFIG_LIBIPW_DEBUG */

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

    return 0;
}

static void __exit libipw_exit(void)
{
#ifdef CONFIG_LIBIPW_DEBUG
    if (libipw_proc) {
        remove_proc_entry("debug_level", libipw_proc);
        remove_proc_entry(DRV_PROCNAME, init_net.proc_net);
        libipw_proc = NULL;
    }
#endif              /* CONFIG_LIBIPW_DEBUG */
}

#ifdef CONFIG_LIBIPW_DEBUG
#include <linux/moduleparam.h>
module_param(debug, int, 0444);
MODULE_PARM_DESC(debug, "debug output mask");
#endif              /* CONFIG_LIBIPW_DEBUG */

module_exit(libipw_exit);
module_init(libipw_init);