diff options
Diffstat (limited to 'net/wireless/core.c')
-rw-r--r-- | net/wireless/core.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/net/wireless/core.c b/net/wireless/core.c new file mode 100644 index 000000000000..7eabd55417a5 --- /dev/null +++ b/net/wireless/core.c | |||
@@ -0,0 +1,224 @@ | |||
1 | /* | ||
2 | * This is the linux wireless configuration interface. | ||
3 | * | ||
4 | * Copyright 2006, 2007 Johannes Berg <johannes@sipsolutions.net> | ||
5 | */ | ||
6 | |||
7 | #include <linux/if.h> | ||
8 | #include <linux/module.h> | ||
9 | #include <linux/err.h> | ||
10 | #include <linux/mutex.h> | ||
11 | #include <linux/list.h> | ||
12 | #include <linux/nl80211.h> | ||
13 | #include <linux/debugfs.h> | ||
14 | #include <linux/notifier.h> | ||
15 | #include <linux/device.h> | ||
16 | #include <net/genetlink.h> | ||
17 | #include <net/cfg80211.h> | ||
18 | #include <net/wireless.h> | ||
19 | #include "core.h" | ||
20 | #include "sysfs.h" | ||
21 | |||
22 | /* name for sysfs, %d is appended */ | ||
23 | #define PHY_NAME "phy" | ||
24 | |||
25 | MODULE_AUTHOR("Johannes Berg"); | ||
26 | MODULE_LICENSE("GPL"); | ||
27 | MODULE_DESCRIPTION("wireless configuration support"); | ||
28 | |||
29 | /* RCU might be appropriate here since we usually | ||
30 | * only read the list, and that can happen quite | ||
31 | * often because we need to do it for each command */ | ||
32 | LIST_HEAD(cfg80211_drv_list); | ||
33 | DEFINE_MUTEX(cfg80211_drv_mutex); | ||
34 | static int wiphy_counter; | ||
35 | |||
36 | /* for debugfs */ | ||
37 | static struct dentry *ieee80211_debugfs_dir; | ||
38 | |||
39 | /* exported functions */ | ||
40 | |||
41 | struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv) | ||
42 | { | ||
43 | struct cfg80211_registered_device *drv; | ||
44 | int alloc_size; | ||
45 | |||
46 | alloc_size = sizeof(*drv) + sizeof_priv; | ||
47 | |||
48 | drv = kzalloc(alloc_size, GFP_KERNEL); | ||
49 | if (!drv) | ||
50 | return NULL; | ||
51 | |||
52 | drv->ops = ops; | ||
53 | |||
54 | mutex_lock(&cfg80211_drv_mutex); | ||
55 | |||
56 | drv->idx = wiphy_counter; | ||
57 | |||
58 | /* now increase counter for the next device unless | ||
59 | * it has wrapped previously */ | ||
60 | if (wiphy_counter >= 0) | ||
61 | wiphy_counter++; | ||
62 | |||
63 | mutex_unlock(&cfg80211_drv_mutex); | ||
64 | |||
65 | if (unlikely(drv->idx < 0)) { | ||
66 | /* ugh, wrapped! */ | ||
67 | kfree(drv); | ||
68 | return NULL; | ||
69 | } | ||
70 | |||
71 | /* give it a proper name */ | ||
72 | snprintf(drv->wiphy.dev.bus_id, BUS_ID_SIZE, | ||
73 | PHY_NAME "%d", drv->idx); | ||
74 | |||
75 | mutex_init(&drv->mtx); | ||
76 | mutex_init(&drv->devlist_mtx); | ||
77 | INIT_LIST_HEAD(&drv->netdev_list); | ||
78 | |||
79 | device_initialize(&drv->wiphy.dev); | ||
80 | drv->wiphy.dev.class = &ieee80211_class; | ||
81 | drv->wiphy.dev.platform_data = drv; | ||
82 | |||
83 | return &drv->wiphy; | ||
84 | } | ||
85 | EXPORT_SYMBOL(wiphy_new); | ||
86 | |||
87 | int wiphy_register(struct wiphy *wiphy) | ||
88 | { | ||
89 | struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy); | ||
90 | int res; | ||
91 | |||
92 | mutex_lock(&cfg80211_drv_mutex); | ||
93 | |||
94 | res = device_add(&drv->wiphy.dev); | ||
95 | if (res) | ||
96 | goto out_unlock; | ||
97 | |||
98 | list_add(&drv->list, &cfg80211_drv_list); | ||
99 | |||
100 | /* add to debugfs */ | ||
101 | drv->wiphy.debugfsdir = | ||
102 | debugfs_create_dir(wiphy_name(&drv->wiphy), | ||
103 | ieee80211_debugfs_dir); | ||
104 | |||
105 | res = 0; | ||
106 | out_unlock: | ||
107 | mutex_unlock(&cfg80211_drv_mutex); | ||
108 | return res; | ||
109 | } | ||
110 | EXPORT_SYMBOL(wiphy_register); | ||
111 | |||
112 | void wiphy_unregister(struct wiphy *wiphy) | ||
113 | { | ||
114 | struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy); | ||
115 | |||
116 | /* protect the device list */ | ||
117 | mutex_lock(&cfg80211_drv_mutex); | ||
118 | |||
119 | BUG_ON(!list_empty(&drv->netdev_list)); | ||
120 | |||
121 | /* | ||
122 | * Try to grab drv->mtx. If a command is still in progress, | ||
123 | * hopefully the driver will refuse it since it's tearing | ||
124 | * down the device already. We wait for this command to complete | ||
125 | * before unlinking the item from the list. | ||
126 | * Note: as codified by the BUG_ON above we cannot get here if | ||
127 | * a virtual interface is still associated. Hence, we can only | ||
128 | * get to lock contention here if userspace issues a command | ||
129 | * that identified the hardware by wiphy index. | ||
130 | */ | ||
131 | mutex_lock(&drv->mtx); | ||
132 | /* unlock again before freeing */ | ||
133 | mutex_unlock(&drv->mtx); | ||
134 | |||
135 | list_del(&drv->list); | ||
136 | device_del(&drv->wiphy.dev); | ||
137 | debugfs_remove(drv->wiphy.debugfsdir); | ||
138 | |||
139 | mutex_unlock(&cfg80211_drv_mutex); | ||
140 | } | ||
141 | EXPORT_SYMBOL(wiphy_unregister); | ||
142 | |||
143 | void cfg80211_dev_free(struct cfg80211_registered_device *drv) | ||
144 | { | ||
145 | mutex_destroy(&drv->mtx); | ||
146 | mutex_destroy(&drv->devlist_mtx); | ||
147 | kfree(drv); | ||
148 | } | ||
149 | |||
150 | void wiphy_free(struct wiphy *wiphy) | ||
151 | { | ||
152 | put_device(&wiphy->dev); | ||
153 | } | ||
154 | EXPORT_SYMBOL(wiphy_free); | ||
155 | |||
156 | static int cfg80211_netdev_notifier_call(struct notifier_block * nb, | ||
157 | unsigned long state, | ||
158 | void *ndev) | ||
159 | { | ||
160 | struct net_device *dev = ndev; | ||
161 | struct cfg80211_registered_device *rdev; | ||
162 | |||
163 | if (!dev->ieee80211_ptr) | ||
164 | return 0; | ||
165 | |||
166 | rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy); | ||
167 | |||
168 | switch (state) { | ||
169 | case NETDEV_REGISTER: | ||
170 | mutex_lock(&rdev->devlist_mtx); | ||
171 | list_add(&dev->ieee80211_ptr->list, &rdev->netdev_list); | ||
172 | if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, | ||
173 | "phy80211")) { | ||
174 | printk(KERN_ERR "wireless: failed to add phy80211 " | ||
175 | "symlink to netdev!\n"); | ||
176 | } | ||
177 | dev->ieee80211_ptr->netdev = dev; | ||
178 | mutex_unlock(&rdev->devlist_mtx); | ||
179 | break; | ||
180 | case NETDEV_UNREGISTER: | ||
181 | mutex_lock(&rdev->devlist_mtx); | ||
182 | if (!list_empty(&dev->ieee80211_ptr->list)) { | ||
183 | sysfs_remove_link(&dev->dev.kobj, "phy80211"); | ||
184 | list_del_init(&dev->ieee80211_ptr->list); | ||
185 | } | ||
186 | mutex_unlock(&rdev->devlist_mtx); | ||
187 | break; | ||
188 | } | ||
189 | |||
190 | return 0; | ||
191 | } | ||
192 | |||
193 | static struct notifier_block cfg80211_netdev_notifier = { | ||
194 | .notifier_call = cfg80211_netdev_notifier_call, | ||
195 | }; | ||
196 | |||
197 | static int cfg80211_init(void) | ||
198 | { | ||
199 | int err = wiphy_sysfs_init(); | ||
200 | if (err) | ||
201 | goto out_fail_sysfs; | ||
202 | |||
203 | err = register_netdevice_notifier(&cfg80211_netdev_notifier); | ||
204 | if (err) | ||
205 | goto out_fail_notifier; | ||
206 | |||
207 | ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); | ||
208 | |||
209 | return 0; | ||
210 | |||
211 | out_fail_notifier: | ||
212 | wiphy_sysfs_exit(); | ||
213 | out_fail_sysfs: | ||
214 | return err; | ||
215 | } | ||
216 | module_init(cfg80211_init); | ||
217 | |||
218 | static void cfg80211_exit(void) | ||
219 | { | ||
220 | debugfs_remove(ieee80211_debugfs_dir); | ||
221 | unregister_netdevice_notifier(&cfg80211_netdev_notifier); | ||
222 | wiphy_sysfs_exit(); | ||
223 | } | ||
224 | module_exit(cfg80211_exit); | ||