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[linux.git] / 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   <[email protected]>
10   Copyright (c) 2002-2003, Jouni Malinen <[email protected]>
11
12
13   Contact Information:
14   Intel Linux Wireless <[email protected]>
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 <[email protected]>"
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);
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