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 file_operations debug_level_proc_fops = {
244 	.owner		= THIS_MODULE,
245 	.open		= debug_level_proc_open,
246 	.read		= seq_read,
247 	.llseek		= seq_lseek,
248 	.release	= single_release,
249 	.write		= debug_level_proc_write,
250 };
251 #endif				/* CONFIG_LIBIPW_DEBUG */
252 
253 static int __init libipw_init(void)
254 {
255 #ifdef CONFIG_LIBIPW_DEBUG
256 	struct proc_dir_entry *e;
257 
258 	libipw_debug_level = debug;
259 	libipw_proc = proc_mkdir(DRV_PROCNAME, init_net.proc_net);
260 	if (libipw_proc == NULL) {
261 		LIBIPW_ERROR("Unable to create " DRV_PROCNAME
262 				" proc directory\n");
263 		return -EIO;
264 	}
265 	e = proc_create("debug_level", 0644, libipw_proc,
266 			&debug_level_proc_fops);
267 	if (!e) {
268 		remove_proc_entry(DRV_PROCNAME, init_net.proc_net);
269 		libipw_proc = NULL;
270 		return -EIO;
271 	}
272 #endif				/* CONFIG_LIBIPW_DEBUG */
273 
274 	printk(KERN_INFO DRV_NAME ": " DRV_DESCRIPTION ", " DRV_VERSION "\n");
275 	printk(KERN_INFO DRV_NAME ": " DRV_COPYRIGHT "\n");
276 
277 	return 0;
278 }
279 
280 static void __exit libipw_exit(void)
281 {
282 #ifdef CONFIG_LIBIPW_DEBUG
283 	if (libipw_proc) {
284 		remove_proc_entry("debug_level", libipw_proc);
285 		remove_proc_entry(DRV_PROCNAME, init_net.proc_net);
286 		libipw_proc = NULL;
287 	}
288 #endif				/* CONFIG_LIBIPW_DEBUG */
289 }
290 
291 #ifdef CONFIG_LIBIPW_DEBUG
292 #include <linux/moduleparam.h>
293 module_param(debug, int, 0444);
294 MODULE_PARM_DESC(debug, "debug output mask");
295 #endif				/* CONFIG_LIBIPW_DEBUG */
296 
297 module_exit(libipw_exit);
298 module_init(libipw_init);
299