drivers/net/wireless/intel/ipw2x00/libipw_module.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*******************************************************************************
   3
   4   Copyright(c) 2004-2005 Intel Corporation. All rights reserved.
   5
   6   Portions of this file are based on the WEP enablement code provided by the
   7   Host AP project hostap-drivers v0.1.3
   8   Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
   9   <j@w1.fi>
  10   Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi>
  11
  12
  13   Contact Information:
  14   Intel Linux Wireless <ilw@linux.intel.com>
  15   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  16
  17 *******************************************************************************/
  18
  19 #include <linux/compiler.h>
  20 #include <linux/errno.h>
  21 #include <linux/if_arp.h>
  22 #include <linux/in6.h>
  23 #include <linux/in.h>
  24 #include <linux/ip.h>
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/skbuff.h>
  30 #include <linux/slab.h>
  31 #include <linux/tcp.h>
  32 #include <linux/types.h>
  33 #include <linux/wireless.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/uaccess.h>
  36 #include <net/net_namespace.h>
  37 #include <net/arp.h>
  38
  39 #include "libipw.h"
  40
  41 #define DRV_DESCRIPTION "802.11 data/management/control stack"
  42 #define DRV_NAME        "libipw"
  43 #define DRV_PROCNAME    "ieee80211"
  44 #define DRV_VERSION     LIBIPW_VERSION
  45 #define DRV_COPYRIGHT   "Copyright (C) 2004-2005 Intel Corporation <jketreno@linux.intel.com>"
  46
  47 MODULE_VERSION(DRV_VERSION);
  48 MODULE_DESCRIPTION(DRV_DESCRIPTION);
  49 MODULE_AUTHOR(DRV_COPYRIGHT);
  50 MODULE_LICENSE("GPL");
  51
  52 static struct cfg80211_ops libipw_config_ops = { };
  53 static void *libipw_wiphy_privid = &libipw_wiphy_privid;
  54
  55 static int libipw_networks_allocate(struct libipw_device *ieee)
  56 {
  57         int i, j;
  58
  59         for (i = 0; i < MAX_NETWORK_COUNT; i++) {
  60                 ieee->networks[i] = kzalloc(sizeof(struct libipw_network),
  61                                             GFP_KERNEL);
  62                 if (!ieee->networks[i]) {
  63                         LIBIPW_ERROR("Out of memory allocating beacons\n");
  64                         for (j = 0; j < i; j++)
  65                                 kfree(ieee->networks[j]);
  66                         return -ENOMEM;
  67                 }
  68         }
  69
  70         return 0;
  71 }
  72
  73 static inline void libipw_networks_free(struct libipw_device *ieee)
  74 {
  75         int i;
  76
  77         for (i = 0; i < MAX_NETWORK_COUNT; i++)
  78                 kfree(ieee->networks[i]);
  79 }
  80
  81 void libipw_networks_age(struct libipw_device *ieee,
  82                             unsigned long age_secs)
  83 {
  84         struct libipw_network *network = NULL;
  85         unsigned long flags;
  86         unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
  87
  88         spin_lock_irqsave(&ieee->lock, flags);
  89         list_for_each_entry(network, &ieee->network_list, list) {
  90                 network->last_scanned -= age_jiffies;
  91         }
  92         spin_unlock_irqrestore(&ieee->lock, flags);
  93 }
  94 EXPORT_SYMBOL(libipw_networks_age);
  95
  96 static void libipw_networks_initialize(struct libipw_device *ieee)
  97 {
  98         int i;
  99
 100         INIT_LIST_HEAD(&ieee->network_free_list);
 101         INIT_LIST_HEAD(&ieee->network_list);
 102         for (i = 0; i < MAX_NETWORK_COUNT; i++)
 103                 list_add_tail(&ieee->networks[i]->list,
 104                               &ieee->network_free_list);
 105 }
 106
 107 struct net_device *alloc_libipw(int sizeof_priv, int monitor)
 108 {
 109         struct libipw_device *ieee;
 110         struct net_device *dev;
 111         int err;
 112
 113         LIBIPW_DEBUG_INFO("Initializing...\n");
 114
 115         dev = alloc_etherdev(sizeof(struct libipw_device) + sizeof_priv);
 116         if (!dev)
 117                 goto failed;
 118
 119         ieee = netdev_priv(dev);
 120
 121         ieee->dev = dev;
 122
 123         if (!monitor) {
 124                 ieee->wdev.wiphy = wiphy_new(&libipw_config_ops, 0);
 125                 if (!ieee->wdev.wiphy) {
 126                         LIBIPW_ERROR("Unable to allocate wiphy.\n");
 127                         goto failed_free_netdev;
 128                 }
 129
 130                 ieee->dev->ieee80211_ptr = &ieee->wdev;
 131                 ieee->wdev.iftype = NL80211_IFTYPE_STATION;
 132
 133                 /* Fill-out wiphy structure bits we know...  Not enough info
 134                    here to call set_wiphy_dev or set MAC address or channel info
 135                    -- have to do that in ->ndo_init... */
 136                 ieee->wdev.wiphy->privid = libipw_wiphy_privid;
 137
 138                 ieee->wdev.wiphy->max_scan_ssids = 1;
 139                 ieee->wdev.wiphy->max_scan_ie_len = 0;
 140                 ieee->wdev.wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION)
 141                                                 | BIT(NL80211_IFTYPE_ADHOC);
 142         }
 143
 144         err = libipw_networks_allocate(ieee);
 145         if (err) {
 146                 LIBIPW_ERROR("Unable to allocate beacon storage: %d\n", err);
 147                 goto failed_free_wiphy;
 148         }
 149         libipw_networks_initialize(ieee);
 150
 151         /* Default fragmentation threshold is maximum payload size */
 152         ieee->fts = DEFAULT_FTS;
 153         ieee->rts = DEFAULT_FTS;
 154         ieee->scan_age = DEFAULT_MAX_SCAN_AGE;
 155         ieee->open_wep = 1;
 156
 157         /* Default to enabling full open WEP with host based encrypt/decrypt */
 158         ieee->host_encrypt = 1;
 159         ieee->host_decrypt = 1;
 160         ieee->host_mc_decrypt = 1;
 161
 162         /* Host fragmentation in Open mode. Default is enabled.
 163          * Note: host fragmentation is always enabled if host encryption
 164          * is enabled. For cards can do hardware encryption, they must do
 165          * hardware fragmentation as well. So we don't need a variable
 166          * like host_enc_frag. */
 167         ieee->host_open_frag = 1;
 168         ieee->ieee802_1x = 1;   /* Default to supporting 802.1x */
 169
 170         spin_lock_init(&ieee->lock);
 171
 172         lib80211_crypt_info_init(&ieee->crypt_info, dev->name, &ieee->lock);
 173
 174         ieee->wpa_enabled = 0;
 175         ieee->drop_unencrypted = 0;
 176         ieee->privacy_invoked = 0;
 177
 178         return dev;
 179
 180 failed_free_wiphy:
 181         if (!monitor)
 182                 wiphy_free(ieee->wdev.wiphy);
 183 failed_free_netdev:
 184         free_netdev(dev);
 185 failed:
 186         return NULL;
 187 }
 188 EXPORT_SYMBOL(alloc_libipw);
 189
 190 void free_libipw(struct net_device *dev, int monitor)
 191 {
 192         struct libipw_device *ieee = netdev_priv(dev);
 193
 194         lib80211_crypt_info_free(&ieee->crypt_info);
 195
 196         libipw_networks_free(ieee);
 197
 198         /* free cfg80211 resources */
 199         if (!monitor)
 200                 wiphy_free(ieee->wdev.wiphy);
 201
 202         free_netdev(dev);
 203 }
 204 EXPORT_SYMBOL(free_libipw);
 205
 206 #ifdef CONFIG_LIBIPW_DEBUG
 207
 208 static int debug = 0;
 209 u32 libipw_debug_level = 0;
 210 EXPORT_SYMBOL_GPL(libipw_debug_level);
 211 static struct proc_dir_entry *libipw_proc = NULL;
 212
 213 static int debug_level_proc_show(struct seq_file *m, void *v)
 214 {
 215         seq_printf(m, "0x%08X\n", libipw_debug_level);
 216         return 0;
 217 }
 218
 219 static int debug_level_proc_open(struct inode *inode, struct file *file)
 220 {
 221         return single_open(file, debug_level_proc_show, NULL);
 222 }
 223
 224 static ssize_t debug_level_proc_write(struct file *file,
 225                 const char __user *buffer, size_t count, loff_t *pos)
 226 {
 227         char buf[] = "0x00000000\n";
 228         size_t len = min(sizeof(buf) - 1, count);
 229         unsigned long val;
 230
 231         if (copy_from_user(buf, buffer, len))
 232                 return count;
 233         buf[len] = 0;
 234         if (sscanf(buf, "%li", &val) != 1)
 235                 printk(KERN_INFO DRV_NAME
 236                        ": %s is not in hex or decimal form.\n", buf);
 237         else
 238                 libipw_debug_level = val;
 239
 240         return strnlen(buf, len);
 241 }
 242
 243 static const struct proc_ops debug_level_proc_ops = {
 244         .proc_open      = debug_level_proc_open,
 245         .proc_read      = seq_read,
 246         .proc_lseek     = seq_lseek,
 247         .proc_release   = single_release,
 248         .proc_write     = debug_level_proc_write,
 249 };
 250 #endif                          /* CONFIG_LIBIPW_DEBUG */
 251
 252 static int __init libipw_init(void)
 253 {
 254 #ifdef CONFIG_LIBIPW_DEBUG
 255         struct proc_dir_entry *e;
 256
 257         libipw_debug_level = debug;
 258         libipw_proc = proc_mkdir(DRV_PROCNAME, init_net.proc_net);
 259         if (libipw_proc == NULL) {
 260                 LIBIPW_ERROR("Unable to create " DRV_PROCNAME
 261                                 " proc directory\n");
 262                 return -EIO;
 263         }
 264         e = proc_create("debug_level", 0644, libipw_proc,
 265                         &debug_level_proc_ops);
 266         if (!e) {
 267                 remove_proc_entry(DRV_PROCNAME, init_net.proc_net);
 268                 libipw_proc = NULL;
 269                 return -EIO;
 270         }
 271 #endif                          /* CONFIG_LIBIPW_DEBUG */
 272
 273         printk(KERN_INFO DRV_NAME ": " DRV_DESCRIPTION ", " DRV_VERSION "\n");
 274         printk(KERN_INFO DRV_NAME ": " DRV_COPYRIGHT "\n");
 275
 276         return 0;
 277 }
 278
 279 static void __exit libipw_exit(void)
 280 {
 281 #ifdef CONFIG_LIBIPW_DEBUG
 282         if (libipw_proc) {
 283                 remove_proc_entry("debug_level", libipw_proc);
 284                 remove_proc_entry(DRV_PROCNAME, init_net.proc_net);
 285                 libipw_proc = NULL;
 286         }
 287 #endif                          /* CONFIG_LIBIPW_DEBUG */
 288 }
 289
 290 #ifdef CONFIG_LIBIPW_DEBUG
 291 #include <linux/moduleparam.h>
 292 module_param(debug, int, 0444);
 293 MODULE_PARM_DESC(debug, "debug output mask");
 294 #endif                          /* CONFIG_LIBIPW_DEBUG */
 295
 296 module_exit(libipw_exit);
 297 module_init(libipw_init);