Johannes Berg | 704232c | 2007-04-23 12:20:05 -0700 | [diff] [blame^] | 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 | if (unlikely(wiphy_counter<0)) { |
| 57 | /* ugh, wrapped! */ |
| 58 | kfree(drv); |
| 59 | return NULL; |
| 60 | } |
| 61 | drv->idx = wiphy_counter; |
| 62 | |
| 63 | /* give it a proper name */ |
| 64 | snprintf(drv->wiphy.dev.bus_id, BUS_ID_SIZE, |
| 65 | PHY_NAME "%d", drv->idx); |
| 66 | |
| 67 | /* now increase counter for the next time */ |
| 68 | wiphy_counter++; |
| 69 | mutex_unlock(&cfg80211_drv_mutex); |
| 70 | |
| 71 | mutex_init(&drv->mtx); |
| 72 | mutex_init(&drv->devlist_mtx); |
| 73 | INIT_LIST_HEAD(&drv->netdev_list); |
| 74 | |
| 75 | device_initialize(&drv->wiphy.dev); |
| 76 | drv->wiphy.dev.class = &ieee80211_class; |
| 77 | drv->wiphy.dev.platform_data = drv; |
| 78 | |
| 79 | return &drv->wiphy; |
| 80 | } |
| 81 | EXPORT_SYMBOL(wiphy_new); |
| 82 | |
| 83 | int wiphy_register(struct wiphy *wiphy) |
| 84 | { |
| 85 | struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy); |
| 86 | int res; |
| 87 | |
| 88 | mutex_lock(&cfg80211_drv_mutex); |
| 89 | |
| 90 | |
| 91 | res = device_add(&drv->wiphy.dev); |
| 92 | if (res) |
| 93 | goto out_unlock; |
| 94 | |
| 95 | list_add(&drv->list, &cfg80211_drv_list); |
| 96 | |
| 97 | /* add to debugfs */ |
| 98 | drv->wiphy.debugfsdir = |
| 99 | debugfs_create_dir(wiphy_name(&drv->wiphy), |
| 100 | ieee80211_debugfs_dir); |
| 101 | |
| 102 | res = 0; |
| 103 | out_unlock: |
| 104 | mutex_unlock(&cfg80211_drv_mutex); |
| 105 | return res; |
| 106 | } |
| 107 | EXPORT_SYMBOL(wiphy_register); |
| 108 | |
| 109 | void wiphy_unregister(struct wiphy *wiphy) |
| 110 | { |
| 111 | struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy); |
| 112 | |
| 113 | mutex_lock(&cfg80211_drv_mutex); |
| 114 | |
| 115 | /* hold registered driver mutex during list removal as well |
| 116 | * to make sure no commands are in progress at the moment */ |
| 117 | mutex_lock(&drv->mtx); |
| 118 | list_del(&drv->list); |
| 119 | mutex_unlock(&drv->mtx); |
| 120 | |
| 121 | device_del(&drv->wiphy.dev); |
| 122 | debugfs_remove(drv->wiphy.debugfsdir); |
| 123 | |
| 124 | mutex_unlock(&cfg80211_drv_mutex); |
| 125 | } |
| 126 | EXPORT_SYMBOL(wiphy_unregister); |
| 127 | |
| 128 | void cfg80211_dev_free(struct cfg80211_registered_device *drv) |
| 129 | { |
| 130 | mutex_destroy(&drv->mtx); |
| 131 | mutex_destroy(&drv->devlist_mtx); |
| 132 | kfree(drv); |
| 133 | } |
| 134 | |
| 135 | void wiphy_free(struct wiphy *wiphy) |
| 136 | { |
| 137 | put_device(&wiphy->dev); |
| 138 | } |
| 139 | EXPORT_SYMBOL(wiphy_free); |
| 140 | |
| 141 | static int cfg80211_netdev_notifier_call(struct notifier_block * nb, |
| 142 | unsigned long state, |
| 143 | void *ndev) |
| 144 | { |
| 145 | struct net_device *dev = ndev; |
| 146 | struct cfg80211_registered_device *rdev; |
| 147 | |
| 148 | if (!dev->ieee80211_ptr) |
| 149 | return 0; |
| 150 | |
| 151 | rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy); |
| 152 | |
| 153 | switch (state) { |
| 154 | case NETDEV_REGISTER: |
| 155 | mutex_lock(&rdev->devlist_mtx); |
| 156 | list_add(&dev->ieee80211_ptr->list, &rdev->netdev_list); |
| 157 | if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, |
| 158 | "phy80211")) { |
| 159 | printk(KERN_ERR "wireless: failed to add phy80211 " |
| 160 | "symlink to netdev!\n"); |
| 161 | } |
| 162 | dev->ieee80211_ptr->netdev = dev; |
| 163 | mutex_unlock(&rdev->devlist_mtx); |
| 164 | break; |
| 165 | case NETDEV_UNREGISTER: |
| 166 | mutex_lock(&rdev->devlist_mtx); |
| 167 | if (!list_empty(&dev->ieee80211_ptr->list)) { |
| 168 | sysfs_remove_link(&dev->dev.kobj, "phy80211"); |
| 169 | list_del_init(&dev->ieee80211_ptr->list); |
| 170 | } |
| 171 | mutex_unlock(&rdev->devlist_mtx); |
| 172 | break; |
| 173 | } |
| 174 | |
| 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | static struct notifier_block cfg80211_netdev_notifier = { |
| 179 | .notifier_call = cfg80211_netdev_notifier_call, |
| 180 | }; |
| 181 | |
| 182 | static int cfg80211_init(void) |
| 183 | { |
| 184 | int err = wiphy_sysfs_init(); |
| 185 | if (err) |
| 186 | goto out_fail_sysfs; |
| 187 | |
| 188 | err = register_netdevice_notifier(&cfg80211_netdev_notifier); |
| 189 | if (err) |
| 190 | goto out_fail_notifier; |
| 191 | |
| 192 | ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); |
| 193 | |
| 194 | return 0; |
| 195 | |
| 196 | out_fail_notifier: |
| 197 | wiphy_sysfs_exit(); |
| 198 | out_fail_sysfs: |
| 199 | return err; |
| 200 | } |
| 201 | module_init(cfg80211_init); |
| 202 | |
| 203 | static void cfg80211_exit(void) |
| 204 | { |
| 205 | debugfs_remove(ieee80211_debugfs_dir); |
| 206 | unregister_netdevice_notifier(&cfg80211_netdev_notifier); |
| 207 | wiphy_sysfs_exit(); |
| 208 | } |
| 209 | module_exit(cfg80211_exit); |