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 init_waitqueue_head(&rdev->wpan_phy.sync_txq); 133 134 spin_lock_init(&rdev->wpan_phy.queue_lock); 135 136 return &rdev->wpan_phy; 137 } 138 EXPORT_SYMBOL(wpan_phy_new); 139 140 int wpan_phy_register(struct wpan_phy *phy) 141 { 142 struct cfg802154_registered_device *rdev = wpan_phy_to_rdev(phy); 143 int ret; 144 145 rtnl_lock(); 146 ret = device_add(&phy->dev); 147 if (ret) { 148 rtnl_unlock(); 149 return ret; 150 } 151 152 list_add_rcu(&rdev->list, &cfg802154_rdev_list); 153 cfg802154_rdev_list_generation++; 154 155 /* TODO phy registered lock */ 156 rtnl_unlock(); 157 158 /* TODO nl802154 phy notify */ 159 160 return 0; 161 } 162 EXPORT_SYMBOL(wpan_phy_register); 163 164 void wpan_phy_unregister(struct wpan_phy *phy) 165 { 166 struct cfg802154_registered_device *rdev = wpan_phy_to_rdev(phy); 167 168 wait_event(rdev->dev_wait, ({ 169 int __count; 170 rtnl_lock(); 171 __count = rdev->opencount; 172 rtnl_unlock(); 173 __count == 0; })); 174 175 rtnl_lock(); 176 /* TODO nl802154 phy notify */ 177 /* TODO phy registered lock */ 178 179 WARN_ON(!list_empty(&rdev->wpan_dev_list)); 180 181 /* First remove the hardware from everywhere, this makes 182 * it impossible to find from userspace. 183 */ 184 list_del_rcu(&rdev->list); 185 synchronize_rcu(); 186 187 cfg802154_rdev_list_generation++; 188 189 device_del(&phy->dev); 190 191 rtnl_unlock(); 192 } 193 EXPORT_SYMBOL(wpan_phy_unregister); 194 195 void wpan_phy_free(struct wpan_phy *phy) 196 { 197 put_device(&phy->dev); 198 } 199 EXPORT_SYMBOL(wpan_phy_free); 200 201 int cfg802154_switch_netns(struct cfg802154_registered_device *rdev, 202 struct net *net) 203 { 204 struct wpan_dev *wpan_dev; 205 int err = 0; 206 207 list_for_each_entry(wpan_dev, &rdev->wpan_dev_list, list) { 208 if (!wpan_dev->netdev) 209 continue; 210 wpan_dev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 211 err = dev_change_net_namespace(wpan_dev->netdev, net, "wpan%d"); 212 if (err) 213 break; 214 wpan_dev->netdev->features |= NETIF_F_NETNS_LOCAL; 215 } 216 217 if (err) { 218 /* failed -- clean up to old netns */ 219 net = wpan_phy_net(&rdev->wpan_phy); 220 221 list_for_each_entry_continue_reverse(wpan_dev, 222 &rdev->wpan_dev_list, 223 list) { 224 if (!wpan_dev->netdev) 225 continue; 226 wpan_dev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 227 err = dev_change_net_namespace(wpan_dev->netdev, net, 228 "wpan%d"); 229 WARN_ON(err); 230 wpan_dev->netdev->features |= NETIF_F_NETNS_LOCAL; 231 } 232 233 return err; 234 } 235 236 wpan_phy_net_set(&rdev->wpan_phy, net); 237 238 err = device_rename(&rdev->wpan_phy.dev, dev_name(&rdev->wpan_phy.dev)); 239 WARN_ON(err); 240 241 return 0; 242 } 243 244 void cfg802154_dev_free(struct cfg802154_registered_device *rdev) 245 { 246 kfree(rdev); 247 } 248 249 static void 250 cfg802154_update_iface_num(struct cfg802154_registered_device *rdev, 251 int iftype, int num) 252 { 253 ASSERT_RTNL(); 254 255 rdev->num_running_ifaces += num; 256 } 257 258 static int cfg802154_netdev_notifier_call(struct notifier_block *nb, 259 unsigned long state, void *ptr) 260 { 261 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 262 struct wpan_dev *wpan_dev = dev->ieee802154_ptr; 263 struct cfg802154_registered_device *rdev; 264 265 if (!wpan_dev) 266 return NOTIFY_DONE; 267 268 rdev = wpan_phy_to_rdev(wpan_dev->wpan_phy); 269 270 /* TODO WARN_ON unspec type */ 271 272 switch (state) { 273 /* TODO NETDEV_DEVTYPE */ 274 case NETDEV_REGISTER: 275 dev->features |= NETIF_F_NETNS_LOCAL; 276 wpan_dev->identifier = ++rdev->wpan_dev_id; 277 list_add_rcu(&wpan_dev->list, &rdev->wpan_dev_list); 278 rdev->devlist_generation++; 279 280 wpan_dev->netdev = dev; 281 break; 282 case NETDEV_DOWN: 283 cfg802154_update_iface_num(rdev, wpan_dev->iftype, -1); 284 285 rdev->opencount--; 286 wake_up(&rdev->dev_wait); 287 break; 288 case NETDEV_UP: 289 cfg802154_update_iface_num(rdev, wpan_dev->iftype, 1); 290 291 rdev->opencount++; 292 break; 293 case NETDEV_UNREGISTER: 294 /* It is possible to get NETDEV_UNREGISTER 295 * multiple times. To detect that, check 296 * that the interface is still on the list 297 * of registered interfaces, and only then 298 * remove and clean it up. 299 */ 300 if (!list_empty(&wpan_dev->list)) { 301 list_del_rcu(&wpan_dev->list); 302 rdev->devlist_generation++; 303 } 304 /* synchronize (so that we won't find this netdev 305 * from other code any more) and then clear the list 306 * head so that the above code can safely check for 307 * !list_empty() to avoid double-cleanup. 308 */ 309 synchronize_rcu(); 310 INIT_LIST_HEAD(&wpan_dev->list); 311 break; 312 default: 313 return NOTIFY_DONE; 314 } 315 316 return NOTIFY_OK; 317 } 318 319 static struct notifier_block cfg802154_netdev_notifier = { 320 .notifier_call = cfg802154_netdev_notifier_call, 321 }; 322 323 static void __net_exit cfg802154_pernet_exit(struct net *net) 324 { 325 struct cfg802154_registered_device *rdev; 326 327 rtnl_lock(); 328 list_for_each_entry(rdev, &cfg802154_rdev_list, list) { 329 if (net_eq(wpan_phy_net(&rdev->wpan_phy), net)) 330 WARN_ON(cfg802154_switch_netns(rdev, &init_net)); 331 } 332 rtnl_unlock(); 333 } 334 335 static struct pernet_operations cfg802154_pernet_ops = { 336 .exit = cfg802154_pernet_exit, 337 }; 338 339 static int __init wpan_phy_class_init(void) 340 { 341 int rc; 342 343 rc = register_pernet_device(&cfg802154_pernet_ops); 344 if (rc) 345 goto err; 346 347 rc = wpan_phy_sysfs_init(); 348 if (rc) 349 goto err_sysfs; 350 351 rc = register_netdevice_notifier(&cfg802154_netdev_notifier); 352 if (rc) 353 goto err_nl; 354 355 rc = ieee802154_nl_init(); 356 if (rc) 357 goto err_notifier; 358 359 rc = nl802154_init(); 360 if (rc) 361 goto err_ieee802154_nl; 362 363 return 0; 364 365 err_ieee802154_nl: 366 ieee802154_nl_exit(); 367 368 err_notifier: 369 unregister_netdevice_notifier(&cfg802154_netdev_notifier); 370 err_nl: 371 wpan_phy_sysfs_exit(); 372 err_sysfs: 373 unregister_pernet_device(&cfg802154_pernet_ops); 374 err: 375 return rc; 376 } 377 subsys_initcall(wpan_phy_class_init); 378 379 static void __exit wpan_phy_class_exit(void) 380 { 381 nl802154_exit(); 382 ieee802154_nl_exit(); 383 unregister_netdevice_notifier(&cfg802154_netdev_notifier); 384 wpan_phy_sysfs_exit(); 385 unregister_pernet_device(&cfg802154_pernet_ops); 386 } 387 module_exit(wpan_phy_class_exit); 388 389 MODULE_LICENSE("GPL v2"); 390 MODULE_DESCRIPTION("IEEE 802.15.4 configuration interface"); 391 MODULE_AUTHOR("Dmitry Eremin-Solenikov"); 392