Commit | Line | Data |
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f0706e82 | 1 | /* |
0d143fe1 JB |
2 | * Interface handling (except master interface) |
3 | * | |
f0706e82 JB |
4 | * Copyright 2002-2005, Instant802 Networks, Inc. |
5 | * Copyright 2005-2006, Devicescape Software, Inc. | |
6 | * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz> | |
75636525 | 7 | * Copyright 2008, Johannes Berg <johannes@sipsolutions.net> |
f0706e82 JB |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/if_arp.h> | |
15 | #include <linux/netdevice.h> | |
16 | #include <linux/rtnetlink.h> | |
17 | #include <net/mac80211.h> | |
18 | #include "ieee80211_i.h" | |
19 | #include "sta_info.h" | |
e9f207f0 | 20 | #include "debugfs_netdev.h" |
ee385855 | 21 | #include "mesh.h" |
0d143fe1 JB |
22 | #include "led.h" |
23 | ||
c771c9d8 JB |
24 | /** |
25 | * DOC: Interface list locking | |
26 | * | |
27 | * The interface list in each struct ieee80211_local is protected | |
28 | * three-fold: | |
29 | * | |
30 | * (1) modifications may only be done under the RTNL | |
31 | * (2) modifications and readers are protected against each other by | |
32 | * the iflist_mtx. | |
33 | * (3) modifications are done in an RCU manner so atomic readers | |
34 | * can traverse the list in RCU-safe blocks. | |
35 | * | |
36 | * As a consequence, reads (traversals) of the list can be protected | |
37 | * by either the RTNL, the iflist_mtx or RCU. | |
38 | */ | |
39 | ||
40 | ||
0d143fe1 JB |
41 | static int ieee80211_change_mtu(struct net_device *dev, int new_mtu) |
42 | { | |
43 | int meshhdrlen; | |
44 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
45 | ||
46 | meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0; | |
47 | ||
48 | /* FIX: what would be proper limits for MTU? | |
49 | * This interface uses 802.3 frames. */ | |
50 | if (new_mtu < 256 || | |
51 | new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) { | |
52 | return -EINVAL; | |
53 | } | |
54 | ||
55 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
56 | printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu); | |
57 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ | |
58 | dev->mtu = new_mtu; | |
59 | return 0; | |
60 | } | |
61 | ||
62 | static inline int identical_mac_addr_allowed(int type1, int type2) | |
63 | { | |
64 | return type1 == NL80211_IFTYPE_MONITOR || | |
65 | type2 == NL80211_IFTYPE_MONITOR || | |
66 | (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) || | |
67 | (type1 == NL80211_IFTYPE_WDS && | |
68 | (type2 == NL80211_IFTYPE_WDS || | |
69 | type2 == NL80211_IFTYPE_AP)) || | |
70 | (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || | |
71 | (type1 == NL80211_IFTYPE_AP_VLAN && | |
72 | (type2 == NL80211_IFTYPE_AP || | |
73 | type2 == NL80211_IFTYPE_AP_VLAN)); | |
74 | } | |
75 | ||
76 | static int ieee80211_open(struct net_device *dev) | |
77 | { | |
b4a4bf5d JB |
78 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
79 | struct ieee80211_sub_if_data *nsdata; | |
80 | struct ieee80211_local *local = sdata->local; | |
0d143fe1 JB |
81 | struct sta_info *sta; |
82 | struct ieee80211_if_init_conf conf; | |
83 | u32 changed = 0; | |
84 | int res; | |
e8975581 | 85 | u32 hw_reconf_flags = 0; |
0d143fe1 JB |
86 | u8 null_addr[ETH_ALEN] = {0}; |
87 | ||
0d143fe1 JB |
88 | /* fail early if user set an invalid address */ |
89 | if (compare_ether_addr(dev->dev_addr, null_addr) && | |
90 | !is_valid_ether_addr(dev->dev_addr)) | |
91 | return -EADDRNOTAVAIL; | |
92 | ||
93 | /* we hold the RTNL here so can safely walk the list */ | |
94 | list_for_each_entry(nsdata, &local->interfaces, list) { | |
95 | struct net_device *ndev = nsdata->dev; | |
96 | ||
97 | if (ndev != dev && netif_running(ndev)) { | |
98 | /* | |
99 | * Allow only a single IBSS interface to be up at any | |
100 | * time. This is restricted because beacon distribution | |
101 | * cannot work properly if both are in the same IBSS. | |
102 | * | |
103 | * To remove this restriction we'd have to disallow them | |
104 | * from setting the same SSID on different IBSS interfaces | |
105 | * belonging to the same hardware. Then, however, we're | |
106 | * faced with having to adopt two different TSF timers... | |
107 | */ | |
108 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && | |
109 | nsdata->vif.type == NL80211_IFTYPE_ADHOC) | |
110 | return -EBUSY; | |
111 | ||
112 | /* | |
113 | * The remaining checks are only performed for interfaces | |
114 | * with the same MAC address. | |
115 | */ | |
116 | if (compare_ether_addr(dev->dev_addr, ndev->dev_addr)) | |
117 | continue; | |
118 | ||
119 | /* | |
120 | * check whether it may have the same address | |
121 | */ | |
122 | if (!identical_mac_addr_allowed(sdata->vif.type, | |
123 | nsdata->vif.type)) | |
124 | return -ENOTUNIQ; | |
125 | ||
126 | /* | |
127 | * can only add VLANs to enabled APs | |
128 | */ | |
129 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
130 | nsdata->vif.type == NL80211_IFTYPE_AP) | |
131 | sdata->bss = &nsdata->u.ap; | |
132 | } | |
133 | } | |
134 | ||
135 | switch (sdata->vif.type) { | |
136 | case NL80211_IFTYPE_WDS: | |
137 | if (!is_valid_ether_addr(sdata->u.wds.remote_addr)) | |
138 | return -ENOLINK; | |
139 | break; | |
140 | case NL80211_IFTYPE_AP_VLAN: | |
141 | if (!sdata->bss) | |
142 | return -ENOLINK; | |
143 | list_add(&sdata->u.vlan.list, &sdata->bss->vlans); | |
144 | break; | |
145 | case NL80211_IFTYPE_AP: | |
146 | sdata->bss = &sdata->u.ap; | |
147 | break; | |
148 | case NL80211_IFTYPE_MESH_POINT: | |
149 | if (!ieee80211_vif_is_mesh(&sdata->vif)) | |
150 | break; | |
151 | /* mesh ifaces must set allmulti to forward mcast traffic */ | |
152 | atomic_inc(&local->iff_allmultis); | |
153 | break; | |
154 | case NL80211_IFTYPE_STATION: | |
155 | case NL80211_IFTYPE_MONITOR: | |
156 | case NL80211_IFTYPE_ADHOC: | |
157 | /* no special treatment */ | |
158 | break; | |
159 | case NL80211_IFTYPE_UNSPECIFIED: | |
160 | case __NL80211_IFTYPE_AFTER_LAST: | |
161 | /* cannot happen */ | |
162 | WARN_ON(1); | |
163 | break; | |
164 | } | |
165 | ||
166 | if (local->open_count == 0) { | |
167 | res = 0; | |
168 | if (local->ops->start) | |
169 | res = local->ops->start(local_to_hw(local)); | |
170 | if (res) | |
171 | goto err_del_bss; | |
e8975581 JB |
172 | /* we're brought up, everything changes */ |
173 | hw_reconf_flags = ~0; | |
0d143fe1 JB |
174 | ieee80211_led_radio(local, local->hw.conf.radio_enabled); |
175 | } | |
176 | ||
177 | /* | |
178 | * Check all interfaces and copy the hopefully now-present | |
179 | * MAC address to those that have the special null one. | |
180 | */ | |
181 | list_for_each_entry(nsdata, &local->interfaces, list) { | |
182 | struct net_device *ndev = nsdata->dev; | |
183 | ||
184 | /* | |
185 | * No need to check netif_running since we do not allow | |
186 | * it to start up with this invalid address. | |
187 | */ | |
188 | if (compare_ether_addr(null_addr, ndev->dev_addr) == 0) | |
189 | memcpy(ndev->dev_addr, | |
190 | local->hw.wiphy->perm_addr, | |
191 | ETH_ALEN); | |
192 | } | |
193 | ||
194 | if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0) | |
195 | memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, | |
196 | ETH_ALEN); | |
197 | ||
198 | /* | |
199 | * Validate the MAC address for this device. | |
200 | */ | |
201 | if (!is_valid_ether_addr(dev->dev_addr)) { | |
202 | if (!local->open_count && local->ops->stop) | |
203 | local->ops->stop(local_to_hw(local)); | |
204 | return -EADDRNOTAVAIL; | |
205 | } | |
206 | ||
207 | switch (sdata->vif.type) { | |
208 | case NL80211_IFTYPE_AP_VLAN: | |
209 | /* no need to tell driver */ | |
210 | break; | |
211 | case NL80211_IFTYPE_MONITOR: | |
212 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { | |
213 | local->cooked_mntrs++; | |
214 | break; | |
215 | } | |
216 | ||
217 | /* must be before the call to ieee80211_configure_filter */ | |
218 | local->monitors++; | |
e8975581 | 219 | if (local->monitors == 1) { |
0d143fe1 | 220 | local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP; |
e8975581 JB |
221 | hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP; |
222 | } | |
0d143fe1 JB |
223 | |
224 | if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL) | |
225 | local->fif_fcsfail++; | |
226 | if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL) | |
227 | local->fif_plcpfail++; | |
228 | if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) | |
229 | local->fif_control++; | |
230 | if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS) | |
231 | local->fif_other_bss++; | |
232 | ||
233 | netif_addr_lock_bh(local->mdev); | |
234 | ieee80211_configure_filter(local); | |
235 | netif_addr_unlock_bh(local->mdev); | |
236 | break; | |
237 | case NL80211_IFTYPE_STATION: | |
238 | case NL80211_IFTYPE_ADHOC: | |
239 | sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET; | |
240 | /* fall through */ | |
241 | default: | |
242 | conf.vif = &sdata->vif; | |
243 | conf.type = sdata->vif.type; | |
244 | conf.mac_addr = dev->dev_addr; | |
245 | res = local->ops->add_interface(local_to_hw(local), &conf); | |
246 | if (res) | |
247 | goto err_stop; | |
248 | ||
a3c9aa51 AY |
249 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
250 | local->fif_other_bss++; | |
251 | netif_addr_lock_bh(local->mdev); | |
252 | ieee80211_configure_filter(local); | |
253 | netif_addr_unlock_bh(local->mdev); | |
254 | ||
0d143fe1 | 255 | ieee80211_start_mesh(sdata); |
a3c9aa51 | 256 | } |
0d143fe1 JB |
257 | changed |= ieee80211_reset_erp_info(sdata); |
258 | ieee80211_bss_info_change_notify(sdata, changed); | |
259 | ieee80211_enable_keys(sdata); | |
260 | ||
261 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
262 | !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)) | |
263 | netif_carrier_off(dev); | |
264 | else | |
265 | netif_carrier_on(dev); | |
266 | } | |
267 | ||
268 | if (sdata->vif.type == NL80211_IFTYPE_WDS) { | |
269 | /* Create STA entry for the WDS peer */ | |
270 | sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, | |
271 | GFP_KERNEL); | |
272 | if (!sta) { | |
273 | res = -ENOMEM; | |
274 | goto err_del_interface; | |
275 | } | |
276 | ||
277 | /* no locking required since STA is not live yet */ | |
278 | sta->flags |= WLAN_STA_AUTHORIZED; | |
279 | ||
280 | res = sta_info_insert(sta); | |
281 | if (res) { | |
282 | /* STA has been freed */ | |
283 | goto err_del_interface; | |
284 | } | |
285 | } | |
286 | ||
287 | if (local->open_count == 0) { | |
288 | res = dev_open(local->mdev); | |
289 | WARN_ON(res); | |
290 | if (res) | |
291 | goto err_del_interface; | |
292 | tasklet_enable(&local->tx_pending_tasklet); | |
293 | tasklet_enable(&local->tasklet); | |
294 | } | |
295 | ||
296 | /* | |
297 | * set_multicast_list will be invoked by the networking core | |
298 | * which will check whether any increments here were done in | |
299 | * error and sync them down to the hardware as filter flags. | |
300 | */ | |
301 | if (sdata->flags & IEEE80211_SDATA_ALLMULTI) | |
302 | atomic_inc(&local->iff_allmultis); | |
303 | ||
304 | if (sdata->flags & IEEE80211_SDATA_PROMISC) | |
305 | atomic_inc(&local->iff_promiscs); | |
306 | ||
307 | local->open_count++; | |
e8975581 JB |
308 | if (hw_reconf_flags) { |
309 | ieee80211_hw_config(local, hw_reconf_flags); | |
0d143fe1 JB |
310 | /* |
311 | * set default queue parameters so drivers don't | |
312 | * need to initialise the hardware if the hardware | |
313 | * doesn't start up with sane defaults | |
314 | */ | |
315 | ieee80211_set_wmm_default(sdata); | |
316 | } | |
317 | ||
318 | /* | |
319 | * ieee80211_sta_work is disabled while network interface | |
320 | * is down. Therefore, some configuration changes may not | |
321 | * yet be effective. Trigger execution of ieee80211_sta_work | |
322 | * to fix this. | |
323 | */ | |
324 | if (sdata->vif.type == NL80211_IFTYPE_STATION || | |
325 | sdata->vif.type == NL80211_IFTYPE_ADHOC) { | |
326 | struct ieee80211_if_sta *ifsta = &sdata->u.sta; | |
327 | queue_work(local->hw.workqueue, &ifsta->work); | |
328 | } | |
f0706e82 | 329 | |
0d143fe1 JB |
330 | netif_tx_start_all_queues(dev); |
331 | ||
332 | return 0; | |
333 | err_del_interface: | |
334 | local->ops->remove_interface(local_to_hw(local), &conf); | |
335 | err_stop: | |
336 | if (!local->open_count && local->ops->stop) | |
337 | local->ops->stop(local_to_hw(local)); | |
338 | err_del_bss: | |
339 | sdata->bss = NULL; | |
340 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
341 | list_del(&sdata->u.vlan.list); | |
342 | return res; | |
343 | } | |
344 | ||
345 | static int ieee80211_stop(struct net_device *dev) | |
346 | { | |
347 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
348 | struct ieee80211_local *local = sdata->local; | |
349 | struct ieee80211_if_init_conf conf; | |
350 | struct sta_info *sta; | |
e8975581 | 351 | u32 hw_reconf_flags = 0; |
0d143fe1 JB |
352 | |
353 | /* | |
354 | * Stop TX on this interface first. | |
355 | */ | |
356 | netif_tx_stop_all_queues(dev); | |
357 | ||
358 | /* | |
359 | * Now delete all active aggregation sessions. | |
360 | */ | |
361 | rcu_read_lock(); | |
362 | ||
363 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
364 | if (sta->sdata == sdata) | |
17741cdc JB |
365 | ieee80211_sta_tear_down_BA_sessions(sdata, |
366 | sta->sta.addr); | |
0d143fe1 JB |
367 | } |
368 | ||
369 | rcu_read_unlock(); | |
370 | ||
371 | /* | |
372 | * Remove all stations associated with this interface. | |
373 | * | |
374 | * This must be done before calling ops->remove_interface() | |
375 | * because otherwise we can later invoke ops->sta_notify() | |
376 | * whenever the STAs are removed, and that invalidates driver | |
377 | * assumptions about always getting a vif pointer that is valid | |
378 | * (because if we remove a STA after ops->remove_interface() | |
379 | * the driver will have removed the vif info already!) | |
380 | * | |
381 | * We could relax this and only unlink the stations from the | |
382 | * hash table and list but keep them on a per-sdata list that | |
383 | * will be inserted back again when the interface is brought | |
384 | * up again, but I don't currently see a use case for that, | |
385 | * except with WDS which gets a STA entry created when it is | |
386 | * brought up. | |
387 | */ | |
388 | sta_info_flush(local, sdata); | |
389 | ||
390 | /* | |
391 | * Don't count this interface for promisc/allmulti while it | |
392 | * is down. dev_mc_unsync() will invoke set_multicast_list | |
393 | * on the master interface which will sync these down to the | |
394 | * hardware as filter flags. | |
395 | */ | |
396 | if (sdata->flags & IEEE80211_SDATA_ALLMULTI) | |
397 | atomic_dec(&local->iff_allmultis); | |
398 | ||
399 | if (sdata->flags & IEEE80211_SDATA_PROMISC) | |
400 | atomic_dec(&local->iff_promiscs); | |
401 | ||
402 | dev_mc_unsync(local->mdev, dev); | |
7cbf0ba5 VN |
403 | del_timer_sync(&local->dynamic_ps_timer); |
404 | cancel_work_sync(&local->dynamic_ps_enable_work); | |
0d143fe1 JB |
405 | |
406 | /* APs need special treatment */ | |
407 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
408 | struct ieee80211_sub_if_data *vlan, *tmp; | |
409 | struct beacon_data *old_beacon = sdata->u.ap.beacon; | |
410 | ||
411 | /* remove beacon */ | |
412 | rcu_assign_pointer(sdata->u.ap.beacon, NULL); | |
413 | synchronize_rcu(); | |
414 | kfree(old_beacon); | |
415 | ||
416 | /* down all dependent devices, that is VLANs */ | |
417 | list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans, | |
418 | u.vlan.list) | |
419 | dev_close(vlan->dev); | |
420 | WARN_ON(!list_empty(&sdata->u.ap.vlans)); | |
421 | } | |
422 | ||
423 | local->open_count--; | |
424 | ||
425 | switch (sdata->vif.type) { | |
426 | case NL80211_IFTYPE_AP_VLAN: | |
427 | list_del(&sdata->u.vlan.list); | |
428 | /* no need to tell driver */ | |
429 | break; | |
430 | case NL80211_IFTYPE_MONITOR: | |
431 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { | |
432 | local->cooked_mntrs--; | |
433 | break; | |
434 | } | |
435 | ||
436 | local->monitors--; | |
e8975581 | 437 | if (local->monitors == 0) { |
0d143fe1 | 438 | local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP; |
e8975581 JB |
439 | hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP; |
440 | } | |
0d143fe1 JB |
441 | |
442 | if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL) | |
443 | local->fif_fcsfail--; | |
444 | if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL) | |
445 | local->fif_plcpfail--; | |
446 | if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) | |
447 | local->fif_control--; | |
448 | if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS) | |
449 | local->fif_other_bss--; | |
450 | ||
451 | netif_addr_lock_bh(local->mdev); | |
452 | ieee80211_configure_filter(local); | |
453 | netif_addr_unlock_bh(local->mdev); | |
454 | break; | |
455 | case NL80211_IFTYPE_STATION: | |
456 | case NL80211_IFTYPE_ADHOC: | |
e327b847 JL |
457 | /* Announce that we are leaving the network. */ |
458 | if (sdata->u.sta.state != IEEE80211_STA_MLME_DISABLED) | |
459 | ieee80211_sta_deauthenticate(sdata, | |
460 | WLAN_REASON_DEAUTH_LEAVING); | |
461 | ||
0d143fe1 | 462 | memset(sdata->u.sta.bssid, 0, ETH_ALEN); |
c481ec97 | 463 | del_timer_sync(&sdata->u.sta.chswitch_timer); |
0d143fe1 JB |
464 | del_timer_sync(&sdata->u.sta.timer); |
465 | /* | |
466 | * If the timer fired while we waited for it, it will have | |
467 | * requeued the work. Now the work will be running again | |
468 | * but will not rearm the timer again because it checks | |
469 | * whether the interface is running, which, at this point, | |
470 | * it no longer is. | |
471 | */ | |
472 | cancel_work_sync(&sdata->u.sta.work); | |
c481ec97 | 473 | cancel_work_sync(&sdata->u.sta.chswitch_work); |
0d143fe1 JB |
474 | /* |
475 | * When we get here, the interface is marked down. | |
476 | * Call synchronize_rcu() to wait for the RX path | |
477 | * should it be using the interface and enqueuing | |
478 | * frames at this very time on another CPU. | |
479 | */ | |
480 | synchronize_rcu(); | |
481 | skb_queue_purge(&sdata->u.sta.skb_queue); | |
482 | ||
eb46936b VT |
483 | sdata->u.sta.flags &= ~(IEEE80211_STA_PRIVACY_INVOKED | |
484 | IEEE80211_STA_TKIP_WEP_USED); | |
0d143fe1 JB |
485 | kfree(sdata->u.sta.extra_ie); |
486 | sdata->u.sta.extra_ie = NULL; | |
487 | sdata->u.sta.extra_ie_len = 0; | |
488 | /* fall through */ | |
489 | case NL80211_IFTYPE_MESH_POINT: | |
490 | if (ieee80211_vif_is_mesh(&sdata->vif)) { | |
a3c9aa51 AY |
491 | /* other_bss and allmulti are always set on mesh |
492 | * ifaces */ | |
493 | local->fif_other_bss--; | |
0d143fe1 | 494 | atomic_dec(&local->iff_allmultis); |
a3c9aa51 AY |
495 | |
496 | netif_addr_lock_bh(local->mdev); | |
497 | ieee80211_configure_filter(local); | |
498 | netif_addr_unlock_bh(local->mdev); | |
499 | ||
0d143fe1 JB |
500 | ieee80211_stop_mesh(sdata); |
501 | } | |
502 | /* fall through */ | |
503 | default: | |
504 | if (local->scan_sdata == sdata) { | |
505 | if (!local->ops->hw_scan) | |
506 | cancel_delayed_work_sync(&local->scan_work); | |
507 | /* | |
508 | * The software scan can no longer run now, so we can | |
509 | * clear out the scan_sdata reference. However, the | |
510 | * hardware scan may still be running. The complete | |
511 | * function must be prepared to handle a NULL value. | |
512 | */ | |
513 | local->scan_sdata = NULL; | |
514 | /* | |
515 | * The memory barrier guarantees that another CPU | |
516 | * that is hardware-scanning will now see the fact | |
517 | * that this interface is gone. | |
518 | */ | |
519 | smp_mb(); | |
520 | /* | |
521 | * If software scanning, complete the scan but since | |
522 | * the scan_sdata is NULL already don't send out a | |
523 | * scan event to userspace -- the scan is incomplete. | |
524 | */ | |
525 | if (local->sw_scanning) | |
526 | ieee80211_scan_completed(&local->hw); | |
527 | } | |
528 | ||
529 | conf.vif = &sdata->vif; | |
530 | conf.type = sdata->vif.type; | |
531 | conf.mac_addr = dev->dev_addr; | |
532 | /* disable all keys for as long as this netdev is down */ | |
533 | ieee80211_disable_keys(sdata); | |
534 | local->ops->remove_interface(local_to_hw(local), &conf); | |
535 | } | |
536 | ||
537 | sdata->bss = NULL; | |
538 | ||
539 | if (local->open_count == 0) { | |
540 | if (netif_running(local->mdev)) | |
541 | dev_close(local->mdev); | |
542 | ||
543 | if (local->ops->stop) | |
544 | local->ops->stop(local_to_hw(local)); | |
545 | ||
546 | ieee80211_led_radio(local, 0); | |
547 | ||
548 | flush_workqueue(local->hw.workqueue); | |
549 | ||
550 | tasklet_disable(&local->tx_pending_tasklet); | |
551 | tasklet_disable(&local->tasklet); | |
e8975581 JB |
552 | |
553 | /* no reconfiguring after stop! */ | |
554 | hw_reconf_flags = 0; | |
0d143fe1 JB |
555 | } |
556 | ||
e8975581 JB |
557 | /* do after stop to avoid reconfiguring when we stop anyway */ |
558 | if (hw_reconf_flags) | |
559 | ieee80211_hw_config(local, hw_reconf_flags); | |
560 | ||
0d143fe1 JB |
561 | return 0; |
562 | } | |
563 | ||
564 | static void ieee80211_set_multicast_list(struct net_device *dev) | |
565 | { | |
0d143fe1 | 566 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
b4a4bf5d | 567 | struct ieee80211_local *local = sdata->local; |
0d143fe1 JB |
568 | int allmulti, promisc, sdata_allmulti, sdata_promisc; |
569 | ||
570 | allmulti = !!(dev->flags & IFF_ALLMULTI); | |
571 | promisc = !!(dev->flags & IFF_PROMISC); | |
572 | sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); | |
573 | sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC); | |
574 | ||
575 | if (allmulti != sdata_allmulti) { | |
576 | if (dev->flags & IFF_ALLMULTI) | |
577 | atomic_inc(&local->iff_allmultis); | |
578 | else | |
579 | atomic_dec(&local->iff_allmultis); | |
580 | sdata->flags ^= IEEE80211_SDATA_ALLMULTI; | |
581 | } | |
582 | ||
583 | if (promisc != sdata_promisc) { | |
584 | if (dev->flags & IFF_PROMISC) | |
585 | atomic_inc(&local->iff_promiscs); | |
586 | else | |
587 | atomic_dec(&local->iff_promiscs); | |
588 | sdata->flags ^= IEEE80211_SDATA_PROMISC; | |
589 | } | |
590 | ||
591 | dev_mc_sync(local->mdev, dev); | |
592 | } | |
593 | ||
594 | static void ieee80211_if_setup(struct net_device *dev) | |
595 | { | |
596 | ether_setup(dev); | |
597 | dev->hard_start_xmit = ieee80211_subif_start_xmit; | |
598 | dev->wireless_handlers = &ieee80211_iw_handler_def; | |
599 | dev->set_multicast_list = ieee80211_set_multicast_list; | |
600 | dev->change_mtu = ieee80211_change_mtu; | |
601 | dev->open = ieee80211_open; | |
602 | dev->stop = ieee80211_stop; | |
603 | dev->destructor = free_netdev; | |
604 | /* we will validate the address ourselves in ->open */ | |
605 | dev->validate_addr = NULL; | |
606 | } | |
75636525 JB |
607 | /* |
608 | * Called when the netdev is removed or, by the code below, before | |
609 | * the interface type changes. | |
610 | */ | |
611 | static void ieee80211_teardown_sdata(struct net_device *dev) | |
f0706e82 | 612 | { |
75636525 JB |
613 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
614 | struct ieee80211_local *local = sdata->local; | |
615 | struct beacon_data *beacon; | |
616 | struct sk_buff *skb; | |
617 | int flushed; | |
f0706e82 JB |
618 | int i; |
619 | ||
75636525 JB |
620 | /* free extra data */ |
621 | ieee80211_free_keys(sdata); | |
622 | ||
aee14ceb JM |
623 | ieee80211_debugfs_remove_netdev(sdata); |
624 | ||
f0706e82 | 625 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) |
75636525 JB |
626 | __skb_queue_purge(&sdata->fragments[i].skb_list); |
627 | sdata->fragment_next = 0; | |
11a843b7 | 628 | |
75636525 | 629 | switch (sdata->vif.type) { |
05c914fe | 630 | case NL80211_IFTYPE_AP: |
75636525 JB |
631 | beacon = sdata->u.ap.beacon; |
632 | rcu_assign_pointer(sdata->u.ap.beacon, NULL); | |
633 | synchronize_rcu(); | |
634 | kfree(beacon); | |
3e122be0 | 635 | |
75636525 JB |
636 | while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) { |
637 | local->total_ps_buffered--; | |
638 | dev_kfree_skb(skb); | |
639 | } | |
640 | ||
641 | break; | |
05c914fe | 642 | case NL80211_IFTYPE_MESH_POINT: |
75636525 | 643 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
f698d856 | 644 | mesh_rmc_free(sdata); |
472dbc45 | 645 | break; |
05c914fe JB |
646 | case NL80211_IFTYPE_STATION: |
647 | case NL80211_IFTYPE_ADHOC: | |
75636525 JB |
648 | kfree(sdata->u.sta.extra_ie); |
649 | kfree(sdata->u.sta.assocreq_ies); | |
650 | kfree(sdata->u.sta.assocresp_ies); | |
651 | kfree_skb(sdata->u.sta.probe_resp); | |
9aed3cc1 JM |
652 | kfree(sdata->u.sta.ie_probereq); |
653 | kfree(sdata->u.sta.ie_proberesp); | |
654 | kfree(sdata->u.sta.ie_auth); | |
655 | kfree(sdata->u.sta.ie_assocreq); | |
656 | kfree(sdata->u.sta.ie_reassocreq); | |
657 | kfree(sdata->u.sta.ie_deauth); | |
658 | kfree(sdata->u.sta.ie_disassoc); | |
75636525 | 659 | break; |
05c914fe JB |
660 | case NL80211_IFTYPE_WDS: |
661 | case NL80211_IFTYPE_AP_VLAN: | |
662 | case NL80211_IFTYPE_MONITOR: | |
75636525 | 663 | break; |
05c914fe JB |
664 | case NL80211_IFTYPE_UNSPECIFIED: |
665 | case __NL80211_IFTYPE_AFTER_LAST: | |
75636525 JB |
666 | BUG(); |
667 | break; | |
668 | } | |
669 | ||
670 | flushed = sta_info_flush(local, sdata); | |
671 | WARN_ON(flushed); | |
f0706e82 JB |
672 | } |
673 | ||
75636525 JB |
674 | /* |
675 | * Helper function to initialise an interface to a specific type. | |
676 | */ | |
677 | static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, | |
05c914fe | 678 | enum nl80211_iftype type) |
f0706e82 | 679 | { |
75636525 JB |
680 | /* clear type-dependent union */ |
681 | memset(&sdata->u, 0, sizeof(sdata->u)); | |
682 | ||
683 | /* and set some type-dependent values */ | |
684 | sdata->vif.type = type; | |
e16ce63c | 685 | sdata->dev->hard_start_xmit = ieee80211_subif_start_xmit; |
60719ffd | 686 | sdata->wdev.iftype = type; |
75636525 JB |
687 | |
688 | /* only monitor differs */ | |
689 | sdata->dev->type = ARPHRD_ETHER; | |
690 | ||
691 | switch (type) { | |
05c914fe | 692 | case NL80211_IFTYPE_AP: |
75636525 JB |
693 | skb_queue_head_init(&sdata->u.ap.ps_bc_buf); |
694 | INIT_LIST_HEAD(&sdata->u.ap.vlans); | |
695 | break; | |
05c914fe JB |
696 | case NL80211_IFTYPE_STATION: |
697 | case NL80211_IFTYPE_ADHOC: | |
9c6bd790 | 698 | ieee80211_sta_setup_sdata(sdata); |
472dbc45 | 699 | break; |
05c914fe | 700 | case NL80211_IFTYPE_MESH_POINT: |
75636525 JB |
701 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
702 | ieee80211_mesh_init_sdata(sdata); | |
703 | break; | |
05c914fe | 704 | case NL80211_IFTYPE_MONITOR: |
75636525 JB |
705 | sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; |
706 | sdata->dev->hard_start_xmit = ieee80211_monitor_start_xmit; | |
707 | sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | | |
708 | MONITOR_FLAG_OTHER_BSS; | |
709 | break; | |
05c914fe JB |
710 | case NL80211_IFTYPE_WDS: |
711 | case NL80211_IFTYPE_AP_VLAN: | |
75636525 | 712 | break; |
05c914fe JB |
713 | case NL80211_IFTYPE_UNSPECIFIED: |
714 | case __NL80211_IFTYPE_AFTER_LAST: | |
75636525 JB |
715 | BUG(); |
716 | break; | |
717 | } | |
718 | ||
719 | ieee80211_debugfs_add_netdev(sdata); | |
720 | } | |
721 | ||
f3947e2d | 722 | int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, |
05c914fe | 723 | enum nl80211_iftype type) |
75636525 | 724 | { |
f3947e2d JB |
725 | ASSERT_RTNL(); |
726 | ||
727 | if (type == sdata->vif.type) | |
728 | return 0; | |
729 | ||
e60c7744 | 730 | /* Setting ad-hoc mode on non-IBSS channel is not supported. */ |
dcebf45c PR |
731 | if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS && |
732 | type == NL80211_IFTYPE_ADHOC) | |
e60c7744 JB |
733 | return -EOPNOTSUPP; |
734 | ||
f3947e2d JB |
735 | /* |
736 | * We could, here, on changes between IBSS/STA/MESH modes, | |
737 | * invoke an MLME function instead that disassociates etc. | |
738 | * and goes into the requested mode. | |
739 | */ | |
740 | ||
741 | if (netif_running(sdata->dev)) | |
742 | return -EBUSY; | |
743 | ||
75636525 JB |
744 | /* Purge and reset type-dependent state. */ |
745 | ieee80211_teardown_sdata(sdata->dev); | |
746 | ieee80211_setup_sdata(sdata, type); | |
747 | ||
748 | /* reset some values that shouldn't be kept across type changes */ | |
bda3933a | 749 | sdata->vif.bss_conf.basic_rates = |
96dd22ac JB |
750 | ieee80211_mandatory_rates(sdata->local, |
751 | sdata->local->hw.conf.channel->band); | |
75636525 | 752 | sdata->drop_unencrypted = 0; |
f3947e2d JB |
753 | |
754 | return 0; | |
f0706e82 JB |
755 | } |
756 | ||
3e122be0 | 757 | int ieee80211_if_add(struct ieee80211_local *local, const char *name, |
05c914fe | 758 | struct net_device **new_dev, enum nl80211_iftype type, |
ee385855 | 759 | struct vif_params *params) |
f0706e82 JB |
760 | { |
761 | struct net_device *ndev; | |
f0706e82 | 762 | struct ieee80211_sub_if_data *sdata = NULL; |
75636525 | 763 | int ret, i; |
f0706e82 JB |
764 | |
765 | ASSERT_RTNL(); | |
75636525 | 766 | |
32bfd35d | 767 | ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size, |
f0706e82 JB |
768 | name, ieee80211_if_setup); |
769 | if (!ndev) | |
770 | return -ENOMEM; | |
771 | ||
f3994ece JB |
772 | ndev->needed_headroom = local->tx_headroom + |
773 | 4*6 /* four MAC addresses */ | |
774 | + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ | |
775 | + 6 /* mesh */ | |
776 | + 8 /* rfc1042/bridge tunnel */ | |
777 | - ETH_HLEN /* ethernet hard_header_len */ | |
778 | + IEEE80211_ENCRYPT_HEADROOM; | |
779 | ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; | |
780 | ||
f0706e82 JB |
781 | ret = dev_alloc_name(ndev, ndev->name); |
782 | if (ret < 0) | |
783 | goto fail; | |
784 | ||
785 | memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN); | |
f0706e82 JB |
786 | SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); |
787 | ||
3e122be0 JB |
788 | /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */ |
789 | sdata = netdev_priv(ndev); | |
f0706e82 | 790 | ndev->ieee80211_ptr = &sdata->wdev; |
75636525 JB |
791 | |
792 | /* initialise type-independent data */ | |
f0706e82 | 793 | sdata->wdev.wiphy = local->hw.wiphy; |
f0706e82 | 794 | sdata->local = local; |
75636525 JB |
795 | sdata->dev = ndev; |
796 | ||
797 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) | |
798 | skb_queue_head_init(&sdata->fragments[i].skb_list); | |
799 | ||
800 | INIT_LIST_HEAD(&sdata->key_list); | |
801 | ||
802 | sdata->force_unicast_rateidx = -1; | |
803 | sdata->max_ratectrl_rateidx = -1; | |
804 | ||
805 | /* setup type-dependent data */ | |
806 | ieee80211_setup_sdata(sdata, type); | |
f0706e82 JB |
807 | |
808 | ret = register_netdevice(ndev); | |
809 | if (ret) | |
810 | goto fail; | |
811 | ||
75636525 | 812 | ndev->uninit = ieee80211_teardown_sdata; |
f0706e82 | 813 | |
902acc78 JB |
814 | if (ieee80211_vif_is_mesh(&sdata->vif) && |
815 | params && params->mesh_id_len) | |
472dbc45 JB |
816 | ieee80211_sdata_set_mesh_id(sdata, |
817 | params->mesh_id_len, | |
818 | params->mesh_id); | |
ee385855 | 819 | |
c771c9d8 | 820 | mutex_lock(&local->iflist_mtx); |
79010420 | 821 | list_add_tail_rcu(&sdata->list, &local->interfaces); |
c771c9d8 | 822 | mutex_unlock(&local->iflist_mtx); |
79010420 | 823 | |
f0706e82 JB |
824 | if (new_dev) |
825 | *new_dev = ndev; | |
f0706e82 | 826 | |
f0706e82 JB |
827 | return 0; |
828 | ||
75636525 | 829 | fail: |
f0706e82 JB |
830 | free_netdev(ndev); |
831 | return ret; | |
832 | } | |
833 | ||
f698d856 | 834 | void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) |
f0706e82 | 835 | { |
f0706e82 | 836 | ASSERT_RTNL(); |
11a843b7 | 837 | |
c771c9d8 | 838 | mutex_lock(&sdata->local->iflist_mtx); |
75636525 | 839 | list_del_rcu(&sdata->list); |
c771c9d8 JB |
840 | mutex_unlock(&sdata->local->iflist_mtx); |
841 | ||
75636525 | 842 | synchronize_rcu(); |
f698d856 | 843 | unregister_netdevice(sdata->dev); |
f0706e82 JB |
844 | } |
845 | ||
75636525 JB |
846 | /* |
847 | * Remove all interfaces, may only be called at hardware unregistration | |
848 | * time because it doesn't do RCU-safe list removals. | |
849 | */ | |
850 | void ieee80211_remove_interfaces(struct ieee80211_local *local) | |
f0706e82 | 851 | { |
75636525 | 852 | struct ieee80211_sub_if_data *sdata, *tmp; |
f0706e82 JB |
853 | |
854 | ASSERT_RTNL(); | |
855 | ||
75636525 | 856 | list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { |
c771c9d8 JB |
857 | /* |
858 | * we cannot hold the iflist_mtx across unregister_netdevice, | |
859 | * but we only need to hold it for list modifications to lock | |
860 | * out readers since we're under the RTNL here as all other | |
861 | * writers. | |
862 | */ | |
863 | mutex_lock(&local->iflist_mtx); | |
75636525 | 864 | list_del(&sdata->list); |
c771c9d8 JB |
865 | mutex_unlock(&local->iflist_mtx); |
866 | ||
75636525 | 867 | unregister_netdevice(sdata->dev); |
f0706e82 | 868 | } |
f0706e82 | 869 | } |