1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2007, 2008, 2009 Siemens AG 4 */ 5 6 #include <linux/slab.h> 7 #include <linux/kernel.h> 8 #include <linux/module.h> 9 #include <linux/device.h> 10 11 #include <net/cfg802154.h> 12 #include <net/rtnetlink.h> 13 14 #include "ieee802154.h" 15 #include "nl802154.h" 16 #include "sysfs.h" 17 #include "core.h" 18 19 /* name for sysfs, %d is appended */ 20 #define PHY_NAME "phy" 21 22 /* RCU-protected (and RTNL for writers) */ 23 LIST_HEAD(cfg802154_rdev_list); 24 int cfg802154_rdev_list_generation; 25 26 struct wpan_phy *wpan_phy_find(const char *str) 27 { 28 struct device *dev; 29 30 if (WARN_ON(!str)) 31 return NULL; 32 33 dev = class_find_device_by_name(&wpan_phy_class, str); 34 if (!dev) 35 return NULL; 36 37 return container_of(dev, struct wpan_phy, dev); 38 } 39 EXPORT_SYMBOL(wpan_phy_find); 40 41 struct wpan_phy_iter_data { 42 int (*fn)(struct wpan_phy *phy, void *data); 43 void *data; 44 }; 45 46 static int wpan_phy_iter(struct device *dev, void *_data) 47 { 48 struct wpan_phy_iter_data *wpid = _data; 49 struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev); 50 51 return wpid->fn(phy, wpid->data); 52 } 53 54 int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data), 55 void *data) 56 { 57 struct wpan_phy_iter_data wpid = { 58 .fn = fn, 59 .data = data, 60 }; 61 62 return class_for_each_device(&wpan_phy_class, NULL, 63 &wpid, wpan_phy_iter); 64 } 65 EXPORT_SYMBOL(wpan_phy_for_each); 66 67 struct cfg802154_registered_device * 68 cfg802154_rdev_by_wpan_phy_idx(int wpan_phy_idx) 69 { 70 struct cfg802154_registered_device *result = NULL, *rdev; 71 72 ASSERT_RTNL(); 73 74 list_for_each_entry(rdev, &cfg802154_rdev_list, list) { 75 if (rdev->wpan_phy_idx == wpan_phy_idx) { 76 result = rdev; 77 break; 78 } 79 } 80 81 return result; 82 } 83 84 struct wpan_phy *wpan_phy_idx_to_wpan_phy(int wpan_phy_idx) 85 { 86 struct cfg802154_registered_device *rdev; 87 88 ASSERT_RTNL(); 89 90 rdev = cfg802154_rdev_by_wpan_phy_idx(wpan_phy_idx); 91 if (!rdev) 92 return NULL; 93 return &rdev->wpan_phy; 94 } 95 96 struct wpan_phy * 97 wpan_phy_new(const struct cfg802154_ops *ops, size_t priv_size) 98 { 99 static atomic_t wpan_phy_counter = ATOMIC_INIT(0); 100 struct cfg802154_registered_device *rdev; 101 size_t alloc_size; 102 103 alloc_size = sizeof(*rdev) + priv_size; 104 rdev = kzalloc(alloc_size, GFP_KERNEL); 105 if (!rdev) 106 return NULL; 107 108 rdev->ops = ops; 109 110 rdev->wpan_phy_idx = atomic_inc_return(&wpan_phy_counter); 111 112 if (unlikely(rdev->wpan_phy_idx < 0)) { 113 /* ugh, wrapped! */ 114 atomic_dec(&wpan_phy_counter); 115 kfree(rdev); 116 return NULL; 117 } 118 119 /* atomic_inc_return makes it start at 1, make it start at 0 */ 120 rdev->wpan_phy_idx--; 121 122 INIT_LIST_HEAD(&rdev->wpan_dev_list); 123 device_initialize(&rdev->wpan_phy.dev); 124 dev_set_name(&rdev->wpan_phy.dev, PHY_NAME "%d", rdev->wpan_phy_idx); 125 126 rdev->wpan_phy.dev.class = &wpan_phy_class; 127 rdev->wpan_phy.dev.platform_data = rdev; 128 129 wpan_phy_net_set(&rdev->wpan_phy, &init_net); 130 131 init_waitqueue_head(&rdev->dev_wait); 132 133 return &rdev->wpan_phy; 134 } 135 EXPORT_SYMBOL(wpan_phy_new); 136 137 int wpan_phy_register(struct wpan_phy *phy) 138 { 139 struct cfg802154_registered_device *rdev = wpan_phy_to_rdev(phy); 140 int ret; 141 142 rtnl_lock(); 143 ret = device_add(&phy->dev); 144 if (ret) { 145 rtnl_unlock(); 146 return ret; 147 } 148 149 list_add_rcu(&rdev->list, &cfg802154_rdev_list); 150 cfg802154_rdev_list_generation++; 151 152 /* TODO phy registered lock */ 153 rtnl_unlock(); 154 155 /* TODO nl802154 phy notify */ 156 157 return 0; 158 } 159 EXPORT_SYMBOL(wpan_phy_register); 160 161 void wpan_phy_unregister(struct wpan_phy *phy) 162 { 163 struct cfg802154_registered_device *rdev = wpan_phy_to_rdev(phy); 164 165 wait_event(rdev->dev_wait, ({ 166 int __count; 167 rtnl_lock(); 168 __count = rdev->opencount; 169 rtnl_unlock(); 170 __count == 0; })); 171 172 rtnl_lock(); 173 /* TODO nl802154 phy notify */ 174 /* TODO phy registered lock */ 175 176 WARN_ON(!list_empty(&rdev->wpan_dev_list)); 177 178 /* First remove the hardware from everywhere, this makes 179 * it impossible to find from userspace. 180 */ 181 list_del_rcu(&rdev->list); 182 synchronize_rcu(); 183 184 cfg802154_rdev_list_generation++; 185 186 device_del(&phy->dev); 187 188 rtnl_unlock(); 189 } 190 EXPORT_SYMBOL(wpan_phy_unregister); 191 192 void wpan_phy_free(struct wpan_phy *phy) 193 { 194 put_device(&phy->dev); 195 } 196 EXPORT_SYMBOL(wpan_phy_free); 197 198 int cfg802154_switch_netns(struct cfg802154_registered_device *rdev, 199 struct net *net) 200 { 201 struct wpan_dev *wpan_dev; 202 int err = 0; 203 204 list_for_each_entry(wpan_dev, &rdev->wpan_dev_list, list) { 205 if (!wpan_dev->netdev) 206 continue; 207 wpan_dev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 208 err = dev_change_net_namespace(wpan_dev->netdev, net, "wpan%d"); 209 if (err) 210 break; 211 wpan_dev->netdev->features |= NETIF_F_NETNS_LOCAL; 212 } 213 214 if (err) { 215 /* failed -- clean up to old netns */ 216 net = wpan_phy_net(&rdev->wpan_phy); 217 218 list_for_each_entry_continue_reverse(wpan_dev, 219 &rdev->wpan_dev_list, 220 list) { 221 if (!wpan_dev->netdev) 222 continue; 223 wpan_dev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 224 err = dev_change_net_namespace(wpan_dev->netdev, net, 225 "wpan%d"); 226 WARN_ON(err); 227 wpan_dev->netdev->features |= NETIF_F_NETNS_LOCAL; 228 } 229 230 return err; 231 } 232 233 wpan_phy_net_set(&rdev->wpan_phy, net); 234 235 err = device_rename(&rdev->wpan_phy.dev, dev_name(&rdev->wpan_phy.dev)); 236 WARN_ON(err); 237 238 return 0; 239 } 240 241 void cfg802154_dev_free(struct cfg802154_registered_device *rdev) 242 { 243 kfree(rdev); 244 } 245 246 static void 247 cfg802154_update_iface_num(struct cfg802154_registered_device *rdev, 248 int iftype, int num) 249 { 250 ASSERT_RTNL(); 251 252 rdev->num_running_ifaces += num; 253 } 254 255 static int cfg802154_netdev_notifier_call(struct notifier_block *nb, 256 unsigned long state, void *ptr) 257 { 258 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 259 struct wpan_dev *wpan_dev = dev->ieee802154_ptr; 260 struct cfg802154_registered_device *rdev; 261 262 if (!wpan_dev) 263 return NOTIFY_DONE; 264 265 rdev = wpan_phy_to_rdev(wpan_dev->wpan_phy); 266 267 /* TODO WARN_ON unspec type */ 268 269 switch (state) { 270 /* TODO NETDEV_DEVTYPE */ 271 case NETDEV_REGISTER: 272 dev->features |= NETIF_F_NETNS_LOCAL; 273 wpan_dev->identifier = ++rdev->wpan_dev_id; 274 list_add_rcu(&wpan_dev->list, &rdev->wpan_dev_list); 275 rdev->devlist_generation++; 276 277 wpan_dev->netdev = dev; 278 break; 279 case NETDEV_DOWN: 280 cfg802154_update_iface_num(rdev, wpan_dev->iftype, -1); 281 282 rdev->opencount--; 283 wake_up(&rdev->dev_wait); 284 break; 285 case NETDEV_UP: 286 cfg802154_update_iface_num(rdev, wpan_dev->iftype, 1); 287 288 rdev->opencount++; 289 break; 290 case NETDEV_UNREGISTER: 291 /* It is possible to get NETDEV_UNREGISTER 292 * multiple times. To detect that, check 293 * that the interface is still on the list 294 * of registered interfaces, and only then 295 * remove and clean it up. 296 */ 297 if (!list_empty(&wpan_dev->list)) { 298 list_del_rcu(&wpan_dev->list); 299 rdev->devlist_generation++; 300 } 301 /* synchronize (so that we won't find this netdev 302 * from other code any more) and then clear the list 303 * head so that the above code can safely check for 304 * !list_empty() to avoid double-cleanup. 305 */ 306 synchronize_rcu(); 307 INIT_LIST_HEAD(&wpan_dev->list); 308 break; 309 default: 310 return NOTIFY_DONE; 311 } 312 313 return NOTIFY_OK; 314 } 315 316 static struct notifier_block cfg802154_netdev_notifier = { 317 .notifier_call = cfg802154_netdev_notifier_call, 318 }; 319 320 static void __net_exit cfg802154_pernet_exit(struct net *net) 321 { 322 struct cfg802154_registered_device *rdev; 323 324 rtnl_lock(); 325 list_for_each_entry(rdev, &cfg802154_rdev_list, list) { 326 if (net_eq(wpan_phy_net(&rdev->wpan_phy), net)) 327 WARN_ON(cfg802154_switch_netns(rdev, &init_net)); 328 } 329 rtnl_unlock(); 330 } 331 332 static struct pernet_operations cfg802154_pernet_ops = { 333 .exit = cfg802154_pernet_exit, 334 }; 335 336 static int __init wpan_phy_class_init(void) 337 { 338 int rc; 339 340 rc = register_pernet_device(&cfg802154_pernet_ops); 341 if (rc) 342 goto err; 343 344 rc = wpan_phy_sysfs_init(); 345 if (rc) 346 goto err_sysfs; 347 348 rc = register_netdevice_notifier(&cfg802154_netdev_notifier); 349 if (rc) 350 goto err_nl; 351 352 rc = ieee802154_nl_init(); 353 if (rc) 354 goto err_notifier; 355 356 rc = nl802154_init(); 357 if (rc) 358 goto err_ieee802154_nl; 359 360 return 0; 361 362 err_ieee802154_nl: 363 ieee802154_nl_exit(); 364 365 err_notifier: 366 unregister_netdevice_notifier(&cfg802154_netdev_notifier); 367 err_nl: 368 wpan_phy_sysfs_exit(); 369 err_sysfs: 370 unregister_pernet_device(&cfg802154_pernet_ops); 371 err: 372 return rc; 373 } 374 subsys_initcall(wpan_phy_class_init); 375 376 static void __exit wpan_phy_class_exit(void) 377 { 378 nl802154_exit(); 379 ieee802154_nl_exit(); 380 unregister_netdevice_notifier(&cfg802154_netdev_notifier); 381 wpan_phy_sysfs_exit(); 382 unregister_pernet_device(&cfg802154_pernet_ops); 383 } 384 module_exit(wpan_phy_class_exit); 385 386 MODULE_LICENSE("GPL v2"); 387 MODULE_DESCRIPTION("IEEE 802.15.4 configuration interface"); 388 MODULE_AUTHOR("Dmitry Eremin-Solenikov"); 389