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Linux/net/ieee802154/core.c

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  1 /*
  2  * Copyright (C) 2007, 2008, 2009 Siemens AG
  3  *
  4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU General Public License version 2
  6  * as published by the Free Software Foundation.
  7  *
  8  * This program is distributed in the hope that it will be useful,
  9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 11  * GNU General Public License for more details.
 12  *
 13  */
 14 
 15 #include <linux/slab.h>
 16 #include <linux/kernel.h>
 17 #include <linux/module.h>
 18 #include <linux/device.h>
 19 
 20 #include <net/cfg802154.h>
 21 #include <net/rtnetlink.h>
 22 
 23 #include "ieee802154.h"
 24 #include "nl802154.h"
 25 #include "sysfs.h"
 26 #include "core.h"
 27 
 28 /* name for sysfs, %d is appended */
 29 #define PHY_NAME "phy"
 30 
 31 /* RCU-protected (and RTNL for writers) */
 32 LIST_HEAD(cfg802154_rdev_list);
 33 int cfg802154_rdev_list_generation;
 34 
 35 static int wpan_phy_match(struct device *dev, const void *data)
 36 {
 37         return !strcmp(dev_name(dev), (const char *)data);
 38 }
 39 
 40 struct wpan_phy *wpan_phy_find(const char *str)
 41 {
 42         struct device *dev;
 43 
 44         if (WARN_ON(!str))
 45                 return NULL;
 46 
 47         dev = class_find_device(&wpan_phy_class, NULL, str, wpan_phy_match);
 48         if (!dev)
 49                 return NULL;
 50 
 51         return container_of(dev, struct wpan_phy, dev);
 52 }
 53 EXPORT_SYMBOL(wpan_phy_find);
 54 
 55 struct wpan_phy_iter_data {
 56         int (*fn)(struct wpan_phy *phy, void *data);
 57         void *data;
 58 };
 59 
 60 static int wpan_phy_iter(struct device *dev, void *_data)
 61 {
 62         struct wpan_phy_iter_data *wpid = _data;
 63         struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev);
 64 
 65         return wpid->fn(phy, wpid->data);
 66 }
 67 
 68 int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data),
 69                       void *data)
 70 {
 71         struct wpan_phy_iter_data wpid = {
 72                 .fn = fn,
 73                 .data = data,
 74         };
 75 
 76         return class_for_each_device(&wpan_phy_class, NULL,
 77                         &wpid, wpan_phy_iter);
 78 }
 79 EXPORT_SYMBOL(wpan_phy_for_each);
 80 
 81 struct cfg802154_registered_device *
 82 cfg802154_rdev_by_wpan_phy_idx(int wpan_phy_idx)
 83 {
 84         struct cfg802154_registered_device *result = NULL, *rdev;
 85 
 86         ASSERT_RTNL();
 87 
 88         list_for_each_entry(rdev, &cfg802154_rdev_list, list) {
 89                 if (rdev->wpan_phy_idx == wpan_phy_idx) {
 90                         result = rdev;
 91                         break;
 92                 }
 93         }
 94 
 95         return result;
 96 }
 97 
 98 struct wpan_phy *wpan_phy_idx_to_wpan_phy(int wpan_phy_idx)
 99 {
100         struct cfg802154_registered_device *rdev;
101 
102         ASSERT_RTNL();
103 
104         rdev = cfg802154_rdev_by_wpan_phy_idx(wpan_phy_idx);
105         if (!rdev)
106                 return NULL;
107         return &rdev->wpan_phy;
108 }
109 
110 struct wpan_phy *
111 wpan_phy_new(const struct cfg802154_ops *ops, size_t priv_size)
112 {
113         static atomic_t wpan_phy_counter = ATOMIC_INIT(0);
114         struct cfg802154_registered_device *rdev;
115         size_t alloc_size;
116 
117         alloc_size = sizeof(*rdev) + priv_size;
118         rdev = kzalloc(alloc_size, GFP_KERNEL);
119         if (!rdev)
120                 return NULL;
121 
122         rdev->ops = ops;
123 
124         rdev->wpan_phy_idx = atomic_inc_return(&wpan_phy_counter);
125 
126         if (unlikely(rdev->wpan_phy_idx < 0)) {
127                 /* ugh, wrapped! */
128                 atomic_dec(&wpan_phy_counter);
129                 kfree(rdev);
130                 return NULL;
131         }
132 
133         /* atomic_inc_return makes it start at 1, make it start at 0 */
134         rdev->wpan_phy_idx--;
135 
136         INIT_LIST_HEAD(&rdev->wpan_dev_list);
137         device_initialize(&rdev->wpan_phy.dev);
138         dev_set_name(&rdev->wpan_phy.dev, PHY_NAME "%d", rdev->wpan_phy_idx);
139 
140         rdev->wpan_phy.dev.class = &wpan_phy_class;
141         rdev->wpan_phy.dev.platform_data = rdev;
142 
143         wpan_phy_net_set(&rdev->wpan_phy, &init_net);
144 
145         init_waitqueue_head(&rdev->dev_wait);
146 
147         return &rdev->wpan_phy;
148 }
149 EXPORT_SYMBOL(wpan_phy_new);
150 
151 int wpan_phy_register(struct wpan_phy *phy)
152 {
153         struct cfg802154_registered_device *rdev = wpan_phy_to_rdev(phy);
154         int ret;
155 
156         rtnl_lock();
157         ret = device_add(&phy->dev);
158         if (ret) {
159                 rtnl_unlock();
160                 return ret;
161         }
162 
163         list_add_rcu(&rdev->list, &cfg802154_rdev_list);
164         cfg802154_rdev_list_generation++;
165 
166         /* TODO phy registered lock */
167         rtnl_unlock();
168 
169         /* TODO nl802154 phy notify */
170 
171         return 0;
172 }
173 EXPORT_SYMBOL(wpan_phy_register);
174 
175 void wpan_phy_unregister(struct wpan_phy *phy)
176 {
177         struct cfg802154_registered_device *rdev = wpan_phy_to_rdev(phy);
178 
179         wait_event(rdev->dev_wait, ({
180                 int __count;
181                 rtnl_lock();
182                 __count = rdev->opencount;
183                 rtnl_unlock();
184                 __count == 0; }));
185 
186         rtnl_lock();
187         /* TODO nl802154 phy notify */
188         /* TODO phy registered lock */
189 
190         WARN_ON(!list_empty(&rdev->wpan_dev_list));
191 
192         /* First remove the hardware from everywhere, this makes
193          * it impossible to find from userspace.
194          */
195         list_del_rcu(&rdev->list);
196         synchronize_rcu();
197 
198         cfg802154_rdev_list_generation++;
199 
200         device_del(&phy->dev);
201 
202         rtnl_unlock();
203 }
204 EXPORT_SYMBOL(wpan_phy_unregister);
205 
206 void wpan_phy_free(struct wpan_phy *phy)
207 {
208         put_device(&phy->dev);
209 }
210 EXPORT_SYMBOL(wpan_phy_free);
211 
212 int cfg802154_switch_netns(struct cfg802154_registered_device *rdev,
213                            struct net *net)
214 {
215         struct wpan_dev *wpan_dev;
216         int err = 0;
217 
218         list_for_each_entry(wpan_dev, &rdev->wpan_dev_list, list) {
219                 if (!wpan_dev->netdev)
220                         continue;
221                 wpan_dev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
222                 err = dev_change_net_namespace(wpan_dev->netdev, net, "wpan%d");
223                 if (err)
224                         break;
225                 wpan_dev->netdev->features |= NETIF_F_NETNS_LOCAL;
226         }
227 
228         if (err) {
229                 /* failed -- clean up to old netns */
230                 net = wpan_phy_net(&rdev->wpan_phy);
231 
232                 list_for_each_entry_continue_reverse(wpan_dev,
233                                                      &rdev->wpan_dev_list,
234                                                      list) {
235                         if (!wpan_dev->netdev)
236                                 continue;
237                         wpan_dev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
238                         err = dev_change_net_namespace(wpan_dev->netdev, net,
239                                                        "wpan%d");
240                         WARN_ON(err);
241                         wpan_dev->netdev->features |= NETIF_F_NETNS_LOCAL;
242                 }
243 
244                 return err;
245         }
246 
247         wpan_phy_net_set(&rdev->wpan_phy, net);
248 
249         err = device_rename(&rdev->wpan_phy.dev, dev_name(&rdev->wpan_phy.dev));
250         WARN_ON(err);
251 
252         return 0;
253 }
254 
255 void cfg802154_dev_free(struct cfg802154_registered_device *rdev)
256 {
257         kfree(rdev);
258 }
259 
260 static void
261 cfg802154_update_iface_num(struct cfg802154_registered_device *rdev,
262                            int iftype, int num)
263 {
264         ASSERT_RTNL();
265 
266         rdev->num_running_ifaces += num;
267 }
268 
269 static int cfg802154_netdev_notifier_call(struct notifier_block *nb,
270                                           unsigned long state, void *ptr)
271 {
272         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
273         struct wpan_dev *wpan_dev = dev->ieee802154_ptr;
274         struct cfg802154_registered_device *rdev;
275 
276         if (!wpan_dev)
277                 return NOTIFY_DONE;
278 
279         rdev = wpan_phy_to_rdev(wpan_dev->wpan_phy);
280 
281         /* TODO WARN_ON unspec type */
282 
283         switch (state) {
284                 /* TODO NETDEV_DEVTYPE */
285         case NETDEV_REGISTER:
286                 dev->features |= NETIF_F_NETNS_LOCAL;
287                 wpan_dev->identifier = ++rdev->wpan_dev_id;
288                 list_add_rcu(&wpan_dev->list, &rdev->wpan_dev_list);
289                 rdev->devlist_generation++;
290 
291                 wpan_dev->netdev = dev;
292                 break;
293         case NETDEV_DOWN:
294                 cfg802154_update_iface_num(rdev, wpan_dev->iftype, -1);
295 
296                 rdev->opencount--;
297                 wake_up(&rdev->dev_wait);
298                 break;
299         case NETDEV_UP:
300                 cfg802154_update_iface_num(rdev, wpan_dev->iftype, 1);
301 
302                 rdev->opencount++;
303                 break;
304         case NETDEV_UNREGISTER:
305                 /* It is possible to get NETDEV_UNREGISTER
306                  * multiple times. To detect that, check
307                  * that the interface is still on the list
308                  * of registered interfaces, and only then
309                  * remove and clean it up.
310                  */
311                 if (!list_empty(&wpan_dev->list)) {
312                         list_del_rcu(&wpan_dev->list);
313                         rdev->devlist_generation++;
314                 }
315                 /* synchronize (so that we won't find this netdev
316                  * from other code any more) and then clear the list
317                  * head so that the above code can safely check for
318                  * !list_empty() to avoid double-cleanup.
319                  */
320                 synchronize_rcu();
321                 INIT_LIST_HEAD(&wpan_dev->list);
322                 break;
323         default:
324                 return NOTIFY_DONE;
325         }
326 
327         return NOTIFY_OK;
328 }
329 
330 static struct notifier_block cfg802154_netdev_notifier = {
331         .notifier_call = cfg802154_netdev_notifier_call,
332 };
333 
334 static void __net_exit cfg802154_pernet_exit(struct net *net)
335 {
336         struct cfg802154_registered_device *rdev;
337 
338         rtnl_lock();
339         list_for_each_entry(rdev, &cfg802154_rdev_list, list) {
340                 if (net_eq(wpan_phy_net(&rdev->wpan_phy), net))
341                         WARN_ON(cfg802154_switch_netns(rdev, &init_net));
342         }
343         rtnl_unlock();
344 }
345 
346 static struct pernet_operations cfg802154_pernet_ops = {
347         .exit = cfg802154_pernet_exit,
348 };
349 
350 static int __init wpan_phy_class_init(void)
351 {
352         int rc;
353 
354         rc = register_pernet_device(&cfg802154_pernet_ops);
355         if (rc)
356                 goto err;
357 
358         rc = wpan_phy_sysfs_init();
359         if (rc)
360                 goto err_sysfs;
361 
362         rc = register_netdevice_notifier(&cfg802154_netdev_notifier);
363         if (rc)
364                 goto err_nl;
365 
366         rc = ieee802154_nl_init();
367         if (rc)
368                 goto err_notifier;
369 
370         rc = nl802154_init();
371         if (rc)
372                 goto err_ieee802154_nl;
373 
374         return 0;
375 
376 err_ieee802154_nl:
377         ieee802154_nl_exit();
378 
379 err_notifier:
380         unregister_netdevice_notifier(&cfg802154_netdev_notifier);
381 err_nl:
382         wpan_phy_sysfs_exit();
383 err_sysfs:
384         unregister_pernet_device(&cfg802154_pernet_ops);
385 err:
386         return rc;
387 }
388 subsys_initcall(wpan_phy_class_init);
389 
390 static void __exit wpan_phy_class_exit(void)
391 {
392         nl802154_exit();
393         ieee802154_nl_exit();
394         unregister_netdevice_notifier(&cfg802154_netdev_notifier);
395         wpan_phy_sysfs_exit();
396         unregister_pernet_device(&cfg802154_pernet_ops);
397 }
398 module_exit(wpan_phy_class_exit);
399 
400 MODULE_LICENSE("GPL v2");
401 MODULE_DESCRIPTION("IEEE 802.15.4 configuration interface");
402 MODULE_AUTHOR("Dmitry Eremin-Solenikov");
403 
404 

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