Commit | Line | Data |
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2bfb1070 DES |
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 | * | |
2bfb1070 DES |
13 | */ |
14 | ||
5a0e3ad6 | 15 | #include <linux/slab.h> |
2bfb1070 DES |
16 | #include <linux/kernel.h> |
17 | #include <linux/module.h> | |
18 | #include <linux/device.h> | |
19 | ||
5ad60d36 | 20 | #include <net/cfg802154.h> |
f3ada640 | 21 | #include <net/rtnetlink.h> |
2bfb1070 | 22 | |
cb6b3763 | 23 | #include "ieee802154.h" |
79fe1a2a | 24 | #include "nl802154.h" |
e23e9ec1 | 25 | #include "sysfs.h" |
a5dd1d72 | 26 | #include "core.h" |
2bfb1070 | 27 | |
c4dd7471 AA |
28 | /* name for sysfs, %d is appended */ |
29 | #define PHY_NAME "phy" | |
30 | ||
f3ada640 | 31 | /* RCU-protected (and RTNL for writers) */ |
79fe1a2a | 32 | LIST_HEAD(cfg802154_rdev_list); |
ca20ce20 | 33 | int cfg802154_rdev_list_generation; |
f3ada640 | 34 | |
9f3b795a | 35 | static int wpan_phy_match(struct device *dev, const void *data) |
2bfb1070 DES |
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 | ||
9f3b795a | 47 | dev = class_find_device(&wpan_phy_class, NULL, str, wpan_phy_match); |
2bfb1070 DES |
48 | if (!dev) |
49 | return NULL; | |
50 | ||
51 | return container_of(dev, struct wpan_phy, dev); | |
52 | } | |
53 | EXPORT_SYMBOL(wpan_phy_find); | |
54 | ||
1c889f4d DES |
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); | |
4710d806 | 64 | |
1c889f4d DES |
65 | return wpid->fn(phy, wpid->data); |
66 | } | |
67 | ||
68 | int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data), | |
4710d806 | 69 | void *data) |
1c889f4d DES |
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 | ||
79fe1a2a AA |
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 | ||
a26c5fd7 AA |
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 | ||
a5dd1d72 | 110 | struct wpan_phy * |
f601379f | 111 | wpan_phy_new(const struct cfg802154_ops *ops, size_t priv_size) |
2bfb1070 | 112 | { |
53f9ee61 | 113 | static atomic_t wpan_phy_counter = ATOMIC_INIT(0); |
a5dd1d72 AA |
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; | |
2bfb1070 | 123 | |
53f9ee61 AA |
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); | |
a5dd1d72 | 129 | kfree(rdev); |
53f9ee61 | 130 | return NULL; |
2bfb1070 | 131 | } |
53f9ee61 AA |
132 | |
133 | /* atomic_inc_return makes it start at 1, make it start at 0 */ | |
134 | rdev->wpan_phy_idx--; | |
2bfb1070 | 135 | |
fcf39e6e | 136 | INIT_LIST_HEAD(&rdev->wpan_dev_list); |
a5dd1d72 | 137 | device_initialize(&rdev->wpan_phy.dev); |
c4dd7471 | 138 | dev_set_name(&rdev->wpan_phy.dev, PHY_NAME "%d", rdev->wpan_phy_idx); |
2bfb1070 | 139 | |
a5dd1d72 AA |
140 | rdev->wpan_phy.dev.class = &wpan_phy_class; |
141 | rdev->wpan_phy.dev.platform_data = rdev; | |
2bfb1070 | 142 | |
66e5c267 AA |
143 | wpan_phy_net_set(&rdev->wpan_phy, &init_net); |
144 | ||
fcf39e6e AA |
145 | init_waitqueue_head(&rdev->dev_wait); |
146 | ||
a5dd1d72 | 147 | return &rdev->wpan_phy; |
2bfb1070 | 148 | } |
f601379f | 149 | EXPORT_SYMBOL(wpan_phy_new); |
2bfb1070 | 150 | |
e9cf356c | 151 | int wpan_phy_register(struct wpan_phy *phy) |
2bfb1070 | 152 | { |
f3ada640 AA |
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; | |
2bfb1070 DES |
172 | } |
173 | EXPORT_SYMBOL(wpan_phy_register); | |
174 | ||
175 | void wpan_phy_unregister(struct wpan_phy *phy) | |
176 | { | |
f3ada640 AA |
177 | struct cfg802154_registered_device *rdev = wpan_phy_to_rdev(phy); |
178 | ||
fcf39e6e AA |
179 | wait_event(rdev->dev_wait, ({ |
180 | int __count; | |
181 | rtnl_lock(); | |
182 | __count = rdev->opencount; | |
183 | rtnl_unlock(); | |
184 | __count == 0; })); | |
f3ada640 AA |
185 | |
186 | rtnl_lock(); | |
187 | /* TODO nl802154 phy notify */ | |
188 | /* TODO phy registered lock */ | |
189 | ||
fcf39e6e | 190 | WARN_ON(!list_empty(&rdev->wpan_dev_list)); |
f3ada640 AA |
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 | ||
2bfb1070 | 200 | device_del(&phy->dev); |
f3ada640 AA |
201 | |
202 | rtnl_unlock(); | |
2bfb1070 DES |
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 | ||
66e5c267 AA |
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 | ||
a5dd1d72 AA |
255 | void cfg802154_dev_free(struct cfg802154_registered_device *rdev) |
256 | { | |
257 | kfree(rdev); | |
258 | } | |
259 | ||
fcf39e6e AA |
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: | |
f9d1ce8f | 286 | dev->features |= NETIF_F_NETNS_LOCAL; |
fcf39e6e AA |
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 | ||
66e5c267 AA |
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 | ||
2bfb1070 DES |
350 | static int __init wpan_phy_class_init(void) |
351 | { | |
cb6b3763 | 352 | int rc; |
4710d806 | 353 | |
66e5c267 | 354 | rc = register_pernet_device(&cfg802154_pernet_ops); |
cb6b3763 DES |
355 | if (rc) |
356 | goto err; | |
357 | ||
66e5c267 AA |
358 | rc = wpan_phy_sysfs_init(); |
359 | if (rc) | |
360 | goto err_sysfs; | |
361 | ||
fcf39e6e | 362 | rc = register_netdevice_notifier(&cfg802154_netdev_notifier); |
cb6b3763 DES |
363 | if (rc) |
364 | goto err_nl; | |
365 | ||
fcf39e6e AA |
366 | rc = ieee802154_nl_init(); |
367 | if (rc) | |
368 | goto err_notifier; | |
369 | ||
79fe1a2a AA |
370 | rc = nl802154_init(); |
371 | if (rc) | |
372 | goto err_ieee802154_nl; | |
373 | ||
cb6b3763 | 374 | return 0; |
fcf39e6e | 375 | |
79fe1a2a AA |
376 | err_ieee802154_nl: |
377 | ieee802154_nl_exit(); | |
378 | ||
fcf39e6e AA |
379 | err_notifier: |
380 | unregister_netdevice_notifier(&cfg802154_netdev_notifier); | |
cb6b3763 | 381 | err_nl: |
e23e9ec1 | 382 | wpan_phy_sysfs_exit(); |
66e5c267 AA |
383 | err_sysfs: |
384 | unregister_pernet_device(&cfg802154_pernet_ops); | |
cb6b3763 DES |
385 | err: |
386 | return rc; | |
2bfb1070 | 387 | } |
282a3954 | 388 | subsys_initcall(wpan_phy_class_init); |
2bfb1070 DES |
389 | |
390 | static void __exit wpan_phy_class_exit(void) | |
391 | { | |
79fe1a2a | 392 | nl802154_exit(); |
cb6b3763 | 393 | ieee802154_nl_exit(); |
fcf39e6e | 394 | unregister_netdevice_notifier(&cfg802154_netdev_notifier); |
e23e9ec1 | 395 | wpan_phy_sysfs_exit(); |
66e5c267 | 396 | unregister_pernet_device(&cfg802154_pernet_ops); |
2bfb1070 DES |
397 | } |
398 | module_exit(wpan_phy_class_exit); | |
399 | ||
2bfb1070 | 400 | MODULE_LICENSE("GPL v2"); |
cb6b3763 DES |
401 | MODULE_DESCRIPTION("IEEE 802.15.4 configuration interface"); |
402 | MODULE_AUTHOR("Dmitry Eremin-Solenikov"); | |
2bfb1070 | 403 |