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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 | 22 | #include "led.h" |
24487981 | 23 | #include "driver-ops.h" |
0d143fe1 | 24 | |
c771c9d8 JB |
25 | /** |
26 | * DOC: Interface list locking | |
27 | * | |
28 | * The interface list in each struct ieee80211_local is protected | |
29 | * three-fold: | |
30 | * | |
31 | * (1) modifications may only be done under the RTNL | |
32 | * (2) modifications and readers are protected against each other by | |
33 | * the iflist_mtx. | |
34 | * (3) modifications are done in an RCU manner so atomic readers | |
35 | * can traverse the list in RCU-safe blocks. | |
36 | * | |
37 | * As a consequence, reads (traversals) of the list can be protected | |
38 | * by either the RTNL, the iflist_mtx or RCU. | |
39 | */ | |
40 | ||
41 | ||
0d143fe1 JB |
42 | static int ieee80211_change_mtu(struct net_device *dev, int new_mtu) |
43 | { | |
44 | int meshhdrlen; | |
45 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
46 | ||
47 | meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0; | |
48 | ||
49 | /* FIX: what would be proper limits for MTU? | |
50 | * This interface uses 802.3 frames. */ | |
51 | if (new_mtu < 256 || | |
52 | new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) { | |
53 | return -EINVAL; | |
54 | } | |
55 | ||
56 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
57 | printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu); | |
58 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ | |
59 | dev->mtu = new_mtu; | |
60 | return 0; | |
61 | } | |
62 | ||
63 | static inline int identical_mac_addr_allowed(int type1, int type2) | |
64 | { | |
65 | return type1 == NL80211_IFTYPE_MONITOR || | |
66 | type2 == NL80211_IFTYPE_MONITOR || | |
67 | (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) || | |
68 | (type1 == NL80211_IFTYPE_WDS && | |
69 | (type2 == NL80211_IFTYPE_WDS || | |
70 | type2 == NL80211_IFTYPE_AP)) || | |
71 | (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || | |
72 | (type1 == NL80211_IFTYPE_AP_VLAN && | |
73 | (type2 == NL80211_IFTYPE_AP || | |
74 | type2 == NL80211_IFTYPE_AP_VLAN)); | |
75 | } | |
76 | ||
77 | static int ieee80211_open(struct net_device *dev) | |
78 | { | |
b4a4bf5d JB |
79 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
80 | struct ieee80211_sub_if_data *nsdata; | |
81 | struct ieee80211_local *local = sdata->local; | |
0d143fe1 JB |
82 | struct sta_info *sta; |
83 | struct ieee80211_if_init_conf conf; | |
84 | u32 changed = 0; | |
85 | int res; | |
e8975581 | 86 | u32 hw_reconf_flags = 0; |
0d143fe1 JB |
87 | u8 null_addr[ETH_ALEN] = {0}; |
88 | ||
0d143fe1 JB |
89 | /* fail early if user set an invalid address */ |
90 | if (compare_ether_addr(dev->dev_addr, null_addr) && | |
91 | !is_valid_ether_addr(dev->dev_addr)) | |
92 | return -EADDRNOTAVAIL; | |
93 | ||
94 | /* we hold the RTNL here so can safely walk the list */ | |
95 | list_for_each_entry(nsdata, &local->interfaces, list) { | |
96 | struct net_device *ndev = nsdata->dev; | |
97 | ||
98 | if (ndev != dev && netif_running(ndev)) { | |
99 | /* | |
100 | * Allow only a single IBSS interface to be up at any | |
101 | * time. This is restricted because beacon distribution | |
102 | * cannot work properly if both are in the same IBSS. | |
103 | * | |
104 | * To remove this restriction we'd have to disallow them | |
105 | * from setting the same SSID on different IBSS interfaces | |
106 | * belonging to the same hardware. Then, however, we're | |
107 | * faced with having to adopt two different TSF timers... | |
108 | */ | |
109 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && | |
110 | nsdata->vif.type == NL80211_IFTYPE_ADHOC) | |
111 | return -EBUSY; | |
112 | ||
113 | /* | |
114 | * The remaining checks are only performed for interfaces | |
115 | * with the same MAC address. | |
116 | */ | |
117 | if (compare_ether_addr(dev->dev_addr, ndev->dev_addr)) | |
118 | continue; | |
119 | ||
120 | /* | |
121 | * check whether it may have the same address | |
122 | */ | |
123 | if (!identical_mac_addr_allowed(sdata->vif.type, | |
124 | nsdata->vif.type)) | |
125 | return -ENOTUNIQ; | |
126 | ||
127 | /* | |
128 | * can only add VLANs to enabled APs | |
129 | */ | |
130 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
131 | nsdata->vif.type == NL80211_IFTYPE_AP) | |
132 | sdata->bss = &nsdata->u.ap; | |
133 | } | |
134 | } | |
135 | ||
136 | switch (sdata->vif.type) { | |
137 | case NL80211_IFTYPE_WDS: | |
138 | if (!is_valid_ether_addr(sdata->u.wds.remote_addr)) | |
139 | return -ENOLINK; | |
140 | break; | |
141 | case NL80211_IFTYPE_AP_VLAN: | |
142 | if (!sdata->bss) | |
143 | return -ENOLINK; | |
144 | list_add(&sdata->u.vlan.list, &sdata->bss->vlans); | |
145 | break; | |
146 | case NL80211_IFTYPE_AP: | |
147 | sdata->bss = &sdata->u.ap; | |
148 | break; | |
149 | case NL80211_IFTYPE_MESH_POINT: | |
150 | if (!ieee80211_vif_is_mesh(&sdata->vif)) | |
151 | break; | |
152 | /* mesh ifaces must set allmulti to forward mcast traffic */ | |
153 | atomic_inc(&local->iff_allmultis); | |
154 | break; | |
155 | case NL80211_IFTYPE_STATION: | |
156 | case NL80211_IFTYPE_MONITOR: | |
157 | case NL80211_IFTYPE_ADHOC: | |
158 | /* no special treatment */ | |
159 | break; | |
160 | case NL80211_IFTYPE_UNSPECIFIED: | |
161 | case __NL80211_IFTYPE_AFTER_LAST: | |
162 | /* cannot happen */ | |
163 | WARN_ON(1); | |
164 | break; | |
165 | } | |
166 | ||
167 | if (local->open_count == 0) { | |
24487981 | 168 | res = drv_start(local); |
0d143fe1 JB |
169 | if (res) |
170 | goto err_del_bss; | |
e8975581 JB |
171 | /* we're brought up, everything changes */ |
172 | hw_reconf_flags = ~0; | |
1f87f7d3 | 173 | ieee80211_led_radio(local, true); |
0d143fe1 JB |
174 | } |
175 | ||
176 | /* | |
177 | * Check all interfaces and copy the hopefully now-present | |
178 | * MAC address to those that have the special null one. | |
179 | */ | |
180 | list_for_each_entry(nsdata, &local->interfaces, list) { | |
181 | struct net_device *ndev = nsdata->dev; | |
182 | ||
183 | /* | |
184 | * No need to check netif_running since we do not allow | |
185 | * it to start up with this invalid address. | |
186 | */ | |
187 | if (compare_ether_addr(null_addr, ndev->dev_addr) == 0) | |
188 | memcpy(ndev->dev_addr, | |
189 | local->hw.wiphy->perm_addr, | |
190 | ETH_ALEN); | |
191 | } | |
192 | ||
0d143fe1 JB |
193 | /* |
194 | * Validate the MAC address for this device. | |
195 | */ | |
196 | if (!is_valid_ether_addr(dev->dev_addr)) { | |
24487981 JB |
197 | if (!local->open_count) |
198 | drv_stop(local); | |
0d143fe1 JB |
199 | return -EADDRNOTAVAIL; |
200 | } | |
201 | ||
202 | switch (sdata->vif.type) { | |
203 | case NL80211_IFTYPE_AP_VLAN: | |
204 | /* no need to tell driver */ | |
205 | break; | |
206 | case NL80211_IFTYPE_MONITOR: | |
207 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { | |
208 | local->cooked_mntrs++; | |
209 | break; | |
210 | } | |
211 | ||
212 | /* must be before the call to ieee80211_configure_filter */ | |
213 | local->monitors++; | |
e8975581 | 214 | if (local->monitors == 1) { |
0d143fe1 | 215 | local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP; |
e8975581 JB |
216 | hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP; |
217 | } | |
0d143fe1 JB |
218 | |
219 | if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL) | |
220 | local->fif_fcsfail++; | |
221 | if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL) | |
222 | local->fif_plcpfail++; | |
223 | if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) | |
224 | local->fif_control++; | |
225 | if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS) | |
226 | local->fif_other_bss++; | |
227 | ||
3b8d81e0 | 228 | spin_lock_bh(&local->filter_lock); |
0d143fe1 | 229 | ieee80211_configure_filter(local); |
3b8d81e0 | 230 | spin_unlock_bh(&local->filter_lock); |
0d143fe1 | 231 | break; |
0d143fe1 JB |
232 | default: |
233 | conf.vif = &sdata->vif; | |
234 | conf.type = sdata->vif.type; | |
235 | conf.mac_addr = dev->dev_addr; | |
24487981 | 236 | res = drv_add_interface(local, &conf); |
0d143fe1 JB |
237 | if (res) |
238 | goto err_stop; | |
239 | ||
a3c9aa51 AY |
240 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
241 | local->fif_other_bss++; | |
3b8d81e0 | 242 | spin_lock_bh(&local->filter_lock); |
a3c9aa51 | 243 | ieee80211_configure_filter(local); |
3b8d81e0 | 244 | spin_unlock_bh(&local->filter_lock); |
a3c9aa51 | 245 | |
0d143fe1 | 246 | ieee80211_start_mesh(sdata); |
a3c9aa51 | 247 | } |
0d143fe1 JB |
248 | changed |= ieee80211_reset_erp_info(sdata); |
249 | ieee80211_bss_info_change_notify(sdata, changed); | |
250 | ieee80211_enable_keys(sdata); | |
251 | ||
7986cf95 | 252 | if (sdata->vif.type == NL80211_IFTYPE_STATION) |
0d143fe1 JB |
253 | netif_carrier_off(dev); |
254 | else | |
255 | netif_carrier_on(dev); | |
256 | } | |
257 | ||
258 | if (sdata->vif.type == NL80211_IFTYPE_WDS) { | |
259 | /* Create STA entry for the WDS peer */ | |
260 | sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, | |
261 | GFP_KERNEL); | |
262 | if (!sta) { | |
263 | res = -ENOMEM; | |
264 | goto err_del_interface; | |
265 | } | |
266 | ||
267 | /* no locking required since STA is not live yet */ | |
268 | sta->flags |= WLAN_STA_AUTHORIZED; | |
269 | ||
270 | res = sta_info_insert(sta); | |
271 | if (res) { | |
272 | /* STA has been freed */ | |
273 | goto err_del_interface; | |
274 | } | |
275 | } | |
276 | ||
277 | if (local->open_count == 0) { | |
0d143fe1 JB |
278 | tasklet_enable(&local->tx_pending_tasklet); |
279 | tasklet_enable(&local->tasklet); | |
280 | } | |
281 | ||
282 | /* | |
283 | * set_multicast_list will be invoked by the networking core | |
284 | * which will check whether any increments here were done in | |
285 | * error and sync them down to the hardware as filter flags. | |
286 | */ | |
287 | if (sdata->flags & IEEE80211_SDATA_ALLMULTI) | |
288 | atomic_inc(&local->iff_allmultis); | |
289 | ||
290 | if (sdata->flags & IEEE80211_SDATA_PROMISC) | |
291 | atomic_inc(&local->iff_promiscs); | |
292 | ||
5cff20e6 JB |
293 | hw_reconf_flags |= __ieee80211_recalc_idle(local); |
294 | ||
0d143fe1 | 295 | local->open_count++; |
e8975581 JB |
296 | if (hw_reconf_flags) { |
297 | ieee80211_hw_config(local, hw_reconf_flags); | |
0d143fe1 JB |
298 | /* |
299 | * set default queue parameters so drivers don't | |
300 | * need to initialise the hardware if the hardware | |
301 | * doesn't start up with sane defaults | |
302 | */ | |
303 | ieee80211_set_wmm_default(sdata); | |
304 | } | |
305 | ||
10f644a4 | 306 | ieee80211_recalc_ps(local, -1); |
965bedad | 307 | |
0d143fe1 JB |
308 | /* |
309 | * ieee80211_sta_work is disabled while network interface | |
310 | * is down. Therefore, some configuration changes may not | |
311 | * yet be effective. Trigger execution of ieee80211_sta_work | |
312 | * to fix this. | |
313 | */ | |
46900298 JB |
314 | if (sdata->vif.type == NL80211_IFTYPE_STATION) |
315 | queue_work(local->hw.workqueue, &sdata->u.mgd.work); | |
f0706e82 | 316 | |
0d143fe1 JB |
317 | netif_tx_start_all_queues(dev); |
318 | ||
319 | return 0; | |
320 | err_del_interface: | |
24487981 | 321 | drv_remove_interface(local, &conf); |
0d143fe1 | 322 | err_stop: |
24487981 JB |
323 | if (!local->open_count) |
324 | drv_stop(local); | |
0d143fe1 JB |
325 | err_del_bss: |
326 | sdata->bss = NULL; | |
327 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
328 | list_del(&sdata->u.vlan.list); | |
329 | return res; | |
330 | } | |
331 | ||
332 | static int ieee80211_stop(struct net_device *dev) | |
333 | { | |
334 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
335 | struct ieee80211_local *local = sdata->local; | |
336 | struct ieee80211_if_init_conf conf; | |
337 | struct sta_info *sta; | |
e8975581 | 338 | u32 hw_reconf_flags = 0; |
0d143fe1 JB |
339 | |
340 | /* | |
341 | * Stop TX on this interface first. | |
342 | */ | |
343 | netif_tx_stop_all_queues(dev); | |
344 | ||
345 | /* | |
346 | * Now delete all active aggregation sessions. | |
347 | */ | |
348 | rcu_read_lock(); | |
349 | ||
350 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
351 | if (sta->sdata == sdata) | |
2dace10e | 352 | ieee80211_sta_tear_down_BA_sessions(sta); |
0d143fe1 JB |
353 | } |
354 | ||
355 | rcu_read_unlock(); | |
356 | ||
357 | /* | |
358 | * Remove all stations associated with this interface. | |
359 | * | |
360 | * This must be done before calling ops->remove_interface() | |
361 | * because otherwise we can later invoke ops->sta_notify() | |
362 | * whenever the STAs are removed, and that invalidates driver | |
363 | * assumptions about always getting a vif pointer that is valid | |
364 | * (because if we remove a STA after ops->remove_interface() | |
365 | * the driver will have removed the vif info already!) | |
366 | * | |
367 | * We could relax this and only unlink the stations from the | |
368 | * hash table and list but keep them on a per-sdata list that | |
369 | * will be inserted back again when the interface is brought | |
370 | * up again, but I don't currently see a use case for that, | |
371 | * except with WDS which gets a STA entry created when it is | |
372 | * brought up. | |
373 | */ | |
374 | sta_info_flush(local, sdata); | |
375 | ||
376 | /* | |
377 | * Don't count this interface for promisc/allmulti while it | |
378 | * is down. dev_mc_unsync() will invoke set_multicast_list | |
379 | * on the master interface which will sync these down to the | |
380 | * hardware as filter flags. | |
381 | */ | |
382 | if (sdata->flags & IEEE80211_SDATA_ALLMULTI) | |
383 | atomic_dec(&local->iff_allmultis); | |
384 | ||
385 | if (sdata->flags & IEEE80211_SDATA_PROMISC) | |
386 | atomic_dec(&local->iff_promiscs); | |
387 | ||
3b8d81e0 JB |
388 | netif_addr_lock_bh(dev); |
389 | spin_lock_bh(&local->filter_lock); | |
390 | __dev_addr_unsync(&local->mc_list, &local->mc_count, | |
391 | &dev->mc_list, &dev->mc_count); | |
392 | ieee80211_configure_filter(local); | |
393 | spin_unlock_bh(&local->filter_lock); | |
394 | netif_addr_unlock_bh(dev); | |
395 | ||
7cbf0ba5 VN |
396 | del_timer_sync(&local->dynamic_ps_timer); |
397 | cancel_work_sync(&local->dynamic_ps_enable_work); | |
0d143fe1 JB |
398 | |
399 | /* APs need special treatment */ | |
400 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
401 | struct ieee80211_sub_if_data *vlan, *tmp; | |
402 | struct beacon_data *old_beacon = sdata->u.ap.beacon; | |
403 | ||
404 | /* remove beacon */ | |
405 | rcu_assign_pointer(sdata->u.ap.beacon, NULL); | |
406 | synchronize_rcu(); | |
407 | kfree(old_beacon); | |
408 | ||
409 | /* down all dependent devices, that is VLANs */ | |
410 | list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans, | |
411 | u.vlan.list) | |
412 | dev_close(vlan->dev); | |
413 | WARN_ON(!list_empty(&sdata->u.ap.vlans)); | |
414 | } | |
415 | ||
416 | local->open_count--; | |
417 | ||
418 | switch (sdata->vif.type) { | |
419 | case NL80211_IFTYPE_AP_VLAN: | |
420 | list_del(&sdata->u.vlan.list); | |
421 | /* no need to tell driver */ | |
422 | break; | |
423 | case NL80211_IFTYPE_MONITOR: | |
424 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { | |
425 | local->cooked_mntrs--; | |
426 | break; | |
427 | } | |
428 | ||
429 | local->monitors--; | |
e8975581 | 430 | if (local->monitors == 0) { |
0d143fe1 | 431 | local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP; |
e8975581 JB |
432 | hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP; |
433 | } | |
0d143fe1 JB |
434 | |
435 | if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL) | |
436 | local->fif_fcsfail--; | |
437 | if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL) | |
438 | local->fif_plcpfail--; | |
439 | if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) | |
440 | local->fif_control--; | |
441 | if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS) | |
442 | local->fif_other_bss--; | |
443 | ||
3b8d81e0 | 444 | spin_lock_bh(&local->filter_lock); |
0d143fe1 | 445 | ieee80211_configure_filter(local); |
3b8d81e0 | 446 | spin_unlock_bh(&local->filter_lock); |
0d143fe1 JB |
447 | break; |
448 | case NL80211_IFTYPE_STATION: | |
46900298 JB |
449 | del_timer_sync(&sdata->u.mgd.chswitch_timer); |
450 | del_timer_sync(&sdata->u.mgd.timer); | |
0e2b6286 JB |
451 | del_timer_sync(&sdata->u.mgd.conn_mon_timer); |
452 | del_timer_sync(&sdata->u.mgd.bcn_mon_timer); | |
0d143fe1 | 453 | /* |
0e2b6286 JB |
454 | * If any of the timers fired while we waited for it, it will |
455 | * have queued its work. Now the work will be running again | |
0d143fe1 JB |
456 | * but will not rearm the timer again because it checks |
457 | * whether the interface is running, which, at this point, | |
458 | * it no longer is. | |
459 | */ | |
46900298 JB |
460 | cancel_work_sync(&sdata->u.mgd.work); |
461 | cancel_work_sync(&sdata->u.mgd.chswitch_work); | |
0e2b6286 | 462 | cancel_work_sync(&sdata->u.mgd.monitor_work); |
04de8381 KV |
463 | cancel_work_sync(&sdata->u.mgd.beacon_loss_work); |
464 | ||
0d143fe1 JB |
465 | /* |
466 | * When we get here, the interface is marked down. | |
467 | * Call synchronize_rcu() to wait for the RX path | |
468 | * should it be using the interface and enqueuing | |
469 | * frames at this very time on another CPU. | |
470 | */ | |
471 | synchronize_rcu(); | |
46900298 | 472 | skb_queue_purge(&sdata->u.mgd.skb_queue); |
46900298 JB |
473 | /* fall through */ |
474 | case NL80211_IFTYPE_ADHOC: | |
475 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { | |
46900298 JB |
476 | del_timer_sync(&sdata->u.ibss.timer); |
477 | cancel_work_sync(&sdata->u.ibss.work); | |
478 | synchronize_rcu(); | |
479 | skb_queue_purge(&sdata->u.ibss.skb_queue); | |
480 | } | |
0d143fe1 JB |
481 | /* fall through */ |
482 | case NL80211_IFTYPE_MESH_POINT: | |
483 | if (ieee80211_vif_is_mesh(&sdata->vif)) { | |
a3c9aa51 AY |
484 | /* other_bss and allmulti are always set on mesh |
485 | * ifaces */ | |
486 | local->fif_other_bss--; | |
0d143fe1 | 487 | atomic_dec(&local->iff_allmultis); |
a3c9aa51 | 488 | |
3b8d81e0 | 489 | spin_lock_bh(&local->filter_lock); |
a3c9aa51 | 490 | ieee80211_configure_filter(local); |
3b8d81e0 | 491 | spin_unlock_bh(&local->filter_lock); |
a3c9aa51 | 492 | |
0d143fe1 JB |
493 | ieee80211_stop_mesh(sdata); |
494 | } | |
495 | /* fall through */ | |
496 | default: | |
497 | if (local->scan_sdata == sdata) { | |
498 | if (!local->ops->hw_scan) | |
499 | cancel_delayed_work_sync(&local->scan_work); | |
500 | /* | |
501 | * The software scan can no longer run now, so we can | |
502 | * clear out the scan_sdata reference. However, the | |
503 | * hardware scan may still be running. The complete | |
504 | * function must be prepared to handle a NULL value. | |
505 | */ | |
506 | local->scan_sdata = NULL; | |
507 | /* | |
508 | * The memory barrier guarantees that another CPU | |
509 | * that is hardware-scanning will now see the fact | |
510 | * that this interface is gone. | |
511 | */ | |
512 | smp_mb(); | |
513 | /* | |
514 | * If software scanning, complete the scan but since | |
515 | * the scan_sdata is NULL already don't send out a | |
516 | * scan event to userspace -- the scan is incomplete. | |
517 | */ | |
518 | if (local->sw_scanning) | |
2a519311 | 519 | ieee80211_scan_completed(&local->hw, true); |
0d143fe1 JB |
520 | } |
521 | ||
522 | conf.vif = &sdata->vif; | |
523 | conf.type = sdata->vif.type; | |
524 | conf.mac_addr = dev->dev_addr; | |
525 | /* disable all keys for as long as this netdev is down */ | |
526 | ieee80211_disable_keys(sdata); | |
24487981 | 527 | drv_remove_interface(local, &conf); |
0d143fe1 JB |
528 | } |
529 | ||
530 | sdata->bss = NULL; | |
531 | ||
5cff20e6 JB |
532 | hw_reconf_flags |= __ieee80211_recalc_idle(local); |
533 | ||
534 | ieee80211_recalc_ps(local, -1); | |
535 | ||
0d143fe1 | 536 | if (local->open_count == 0) { |
24487981 | 537 | drv_stop(local); |
0d143fe1 | 538 | |
1f87f7d3 | 539 | ieee80211_led_radio(local, false); |
0d143fe1 JB |
540 | |
541 | flush_workqueue(local->hw.workqueue); | |
542 | ||
543 | tasklet_disable(&local->tx_pending_tasklet); | |
544 | tasklet_disable(&local->tasklet); | |
e8975581 JB |
545 | |
546 | /* no reconfiguring after stop! */ | |
547 | hw_reconf_flags = 0; | |
0d143fe1 JB |
548 | } |
549 | ||
e8975581 JB |
550 | /* do after stop to avoid reconfiguring when we stop anyway */ |
551 | if (hw_reconf_flags) | |
552 | ieee80211_hw_config(local, hw_reconf_flags); | |
553 | ||
0d143fe1 JB |
554 | return 0; |
555 | } | |
556 | ||
557 | static void ieee80211_set_multicast_list(struct net_device *dev) | |
558 | { | |
0d143fe1 | 559 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
b4a4bf5d | 560 | struct ieee80211_local *local = sdata->local; |
0d143fe1 JB |
561 | int allmulti, promisc, sdata_allmulti, sdata_promisc; |
562 | ||
563 | allmulti = !!(dev->flags & IFF_ALLMULTI); | |
564 | promisc = !!(dev->flags & IFF_PROMISC); | |
565 | sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); | |
566 | sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC); | |
567 | ||
568 | if (allmulti != sdata_allmulti) { | |
569 | if (dev->flags & IFF_ALLMULTI) | |
570 | atomic_inc(&local->iff_allmultis); | |
571 | else | |
572 | atomic_dec(&local->iff_allmultis); | |
573 | sdata->flags ^= IEEE80211_SDATA_ALLMULTI; | |
574 | } | |
575 | ||
576 | if (promisc != sdata_promisc) { | |
577 | if (dev->flags & IFF_PROMISC) | |
578 | atomic_inc(&local->iff_promiscs); | |
579 | else | |
580 | atomic_dec(&local->iff_promiscs); | |
581 | sdata->flags ^= IEEE80211_SDATA_PROMISC; | |
582 | } | |
3b8d81e0 JB |
583 | spin_lock_bh(&local->filter_lock); |
584 | __dev_addr_sync(&local->mc_list, &local->mc_count, | |
585 | &dev->mc_list, &dev->mc_count); | |
586 | ieee80211_configure_filter(local); | |
587 | spin_unlock_bh(&local->filter_lock); | |
0d143fe1 JB |
588 | } |
589 | ||
75636525 JB |
590 | /* |
591 | * Called when the netdev is removed or, by the code below, before | |
592 | * the interface type changes. | |
593 | */ | |
594 | static void ieee80211_teardown_sdata(struct net_device *dev) | |
f0706e82 | 595 | { |
75636525 JB |
596 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
597 | struct ieee80211_local *local = sdata->local; | |
598 | struct beacon_data *beacon; | |
599 | struct sk_buff *skb; | |
600 | int flushed; | |
f0706e82 JB |
601 | int i; |
602 | ||
75636525 JB |
603 | /* free extra data */ |
604 | ieee80211_free_keys(sdata); | |
605 | ||
aee14ceb JM |
606 | ieee80211_debugfs_remove_netdev(sdata); |
607 | ||
f0706e82 | 608 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) |
75636525 JB |
609 | __skb_queue_purge(&sdata->fragments[i].skb_list); |
610 | sdata->fragment_next = 0; | |
11a843b7 | 611 | |
75636525 | 612 | switch (sdata->vif.type) { |
05c914fe | 613 | case NL80211_IFTYPE_AP: |
75636525 JB |
614 | beacon = sdata->u.ap.beacon; |
615 | rcu_assign_pointer(sdata->u.ap.beacon, NULL); | |
616 | synchronize_rcu(); | |
617 | kfree(beacon); | |
3e122be0 | 618 | |
75636525 JB |
619 | while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) { |
620 | local->total_ps_buffered--; | |
621 | dev_kfree_skb(skb); | |
622 | } | |
623 | ||
624 | break; | |
05c914fe | 625 | case NL80211_IFTYPE_MESH_POINT: |
75636525 | 626 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
f698d856 | 627 | mesh_rmc_free(sdata); |
472dbc45 | 628 | break; |
05c914fe | 629 | case NL80211_IFTYPE_ADHOC: |
af8cdcd8 JB |
630 | if (WARN_ON(sdata->u.ibss.presp)) |
631 | kfree_skb(sdata->u.ibss.presp); | |
46900298 JB |
632 | break; |
633 | case NL80211_IFTYPE_STATION: | |
05c914fe JB |
634 | case NL80211_IFTYPE_WDS: |
635 | case NL80211_IFTYPE_AP_VLAN: | |
636 | case NL80211_IFTYPE_MONITOR: | |
75636525 | 637 | break; |
05c914fe JB |
638 | case NL80211_IFTYPE_UNSPECIFIED: |
639 | case __NL80211_IFTYPE_AFTER_LAST: | |
75636525 JB |
640 | BUG(); |
641 | break; | |
642 | } | |
643 | ||
644 | flushed = sta_info_flush(local, sdata); | |
645 | WARN_ON(flushed); | |
f0706e82 JB |
646 | } |
647 | ||
587e729e JB |
648 | static const struct net_device_ops ieee80211_dataif_ops = { |
649 | .ndo_open = ieee80211_open, | |
650 | .ndo_stop = ieee80211_stop, | |
651 | .ndo_uninit = ieee80211_teardown_sdata, | |
652 | .ndo_start_xmit = ieee80211_subif_start_xmit, | |
653 | .ndo_set_multicast_list = ieee80211_set_multicast_list, | |
654 | .ndo_change_mtu = ieee80211_change_mtu, | |
655 | .ndo_set_mac_address = eth_mac_addr, | |
656 | }; | |
657 | ||
658 | static const struct net_device_ops ieee80211_monitorif_ops = { | |
659 | .ndo_open = ieee80211_open, | |
660 | .ndo_stop = ieee80211_stop, | |
661 | .ndo_uninit = ieee80211_teardown_sdata, | |
662 | .ndo_start_xmit = ieee80211_monitor_start_xmit, | |
663 | .ndo_set_multicast_list = ieee80211_set_multicast_list, | |
664 | .ndo_change_mtu = ieee80211_change_mtu, | |
665 | .ndo_set_mac_address = eth_mac_addr, | |
666 | }; | |
667 | ||
668 | static void ieee80211_if_setup(struct net_device *dev) | |
669 | { | |
670 | ether_setup(dev); | |
671 | dev->netdev_ops = &ieee80211_dataif_ops; | |
672 | dev->wireless_handlers = &ieee80211_iw_handler_def; | |
673 | dev->destructor = free_netdev; | |
674 | } | |
675 | ||
75636525 JB |
676 | /* |
677 | * Helper function to initialise an interface to a specific type. | |
678 | */ | |
679 | static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, | |
05c914fe | 680 | enum nl80211_iftype type) |
f0706e82 | 681 | { |
75636525 JB |
682 | /* clear type-dependent union */ |
683 | memset(&sdata->u, 0, sizeof(sdata->u)); | |
684 | ||
685 | /* and set some type-dependent values */ | |
686 | sdata->vif.type = type; | |
587e729e | 687 | sdata->dev->netdev_ops = &ieee80211_dataif_ops; |
60719ffd | 688 | sdata->wdev.iftype = type; |
75636525 JB |
689 | |
690 | /* only monitor differs */ | |
691 | sdata->dev->type = ARPHRD_ETHER; | |
692 | ||
693 | switch (type) { | |
05c914fe | 694 | case NL80211_IFTYPE_AP: |
75636525 JB |
695 | skb_queue_head_init(&sdata->u.ap.ps_bc_buf); |
696 | INIT_LIST_HEAD(&sdata->u.ap.vlans); | |
697 | break; | |
05c914fe | 698 | case NL80211_IFTYPE_STATION: |
9c6bd790 | 699 | ieee80211_sta_setup_sdata(sdata); |
472dbc45 | 700 | break; |
46900298 JB |
701 | case NL80211_IFTYPE_ADHOC: |
702 | ieee80211_ibss_setup_sdata(sdata); | |
703 | break; | |
05c914fe | 704 | case NL80211_IFTYPE_MESH_POINT: |
75636525 JB |
705 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
706 | ieee80211_mesh_init_sdata(sdata); | |
707 | break; | |
05c914fe | 708 | case NL80211_IFTYPE_MONITOR: |
75636525 | 709 | sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; |
587e729e | 710 | sdata->dev->netdev_ops = &ieee80211_monitorif_ops; |
75636525 JB |
711 | sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | |
712 | MONITOR_FLAG_OTHER_BSS; | |
713 | break; | |
05c914fe JB |
714 | case NL80211_IFTYPE_WDS: |
715 | case NL80211_IFTYPE_AP_VLAN: | |
75636525 | 716 | break; |
05c914fe JB |
717 | case NL80211_IFTYPE_UNSPECIFIED: |
718 | case __NL80211_IFTYPE_AFTER_LAST: | |
75636525 JB |
719 | BUG(); |
720 | break; | |
721 | } | |
722 | ||
723 | ieee80211_debugfs_add_netdev(sdata); | |
724 | } | |
725 | ||
f3947e2d | 726 | int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, |
05c914fe | 727 | enum nl80211_iftype type) |
75636525 | 728 | { |
f3947e2d JB |
729 | ASSERT_RTNL(); |
730 | ||
731 | if (type == sdata->vif.type) | |
732 | return 0; | |
733 | ||
e60c7744 | 734 | /* Setting ad-hoc mode on non-IBSS channel is not supported. */ |
dcebf45c PR |
735 | if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS && |
736 | type == NL80211_IFTYPE_ADHOC) | |
e60c7744 JB |
737 | return -EOPNOTSUPP; |
738 | ||
f3947e2d JB |
739 | /* |
740 | * We could, here, on changes between IBSS/STA/MESH modes, | |
741 | * invoke an MLME function instead that disassociates etc. | |
742 | * and goes into the requested mode. | |
743 | */ | |
744 | ||
745 | if (netif_running(sdata->dev)) | |
746 | return -EBUSY; | |
747 | ||
75636525 JB |
748 | /* Purge and reset type-dependent state. */ |
749 | ieee80211_teardown_sdata(sdata->dev); | |
750 | ieee80211_setup_sdata(sdata, type); | |
751 | ||
752 | /* reset some values that shouldn't be kept across type changes */ | |
bda3933a | 753 | sdata->vif.bss_conf.basic_rates = |
96dd22ac JB |
754 | ieee80211_mandatory_rates(sdata->local, |
755 | sdata->local->hw.conf.channel->band); | |
75636525 | 756 | sdata->drop_unencrypted = 0; |
f3947e2d JB |
757 | |
758 | return 0; | |
f0706e82 JB |
759 | } |
760 | ||
3e122be0 | 761 | int ieee80211_if_add(struct ieee80211_local *local, const char *name, |
05c914fe | 762 | struct net_device **new_dev, enum nl80211_iftype type, |
ee385855 | 763 | struct vif_params *params) |
f0706e82 JB |
764 | { |
765 | struct net_device *ndev; | |
f0706e82 | 766 | struct ieee80211_sub_if_data *sdata = NULL; |
75636525 | 767 | int ret, i; |
f0706e82 JB |
768 | |
769 | ASSERT_RTNL(); | |
75636525 | 770 | |
32bfd35d | 771 | ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size, |
f0706e82 JB |
772 | name, ieee80211_if_setup); |
773 | if (!ndev) | |
774 | return -ENOMEM; | |
775 | ||
f3994ece JB |
776 | ndev->needed_headroom = local->tx_headroom + |
777 | 4*6 /* four MAC addresses */ | |
778 | + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ | |
779 | + 6 /* mesh */ | |
780 | + 8 /* rfc1042/bridge tunnel */ | |
781 | - ETH_HLEN /* ethernet hard_header_len */ | |
782 | + IEEE80211_ENCRYPT_HEADROOM; | |
783 | ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; | |
784 | ||
f0706e82 JB |
785 | ret = dev_alloc_name(ndev, ndev->name); |
786 | if (ret < 0) | |
787 | goto fail; | |
788 | ||
789 | memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN); | |
f0706e82 | 790 | SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); |
076ae609 | 791 | ndev->features |= NETIF_F_NETNS_LOCAL; |
f0706e82 | 792 | |
3e122be0 JB |
793 | /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */ |
794 | sdata = netdev_priv(ndev); | |
f0706e82 | 795 | ndev->ieee80211_ptr = &sdata->wdev; |
75636525 JB |
796 | |
797 | /* initialise type-independent data */ | |
f0706e82 | 798 | sdata->wdev.wiphy = local->hw.wiphy; |
f0706e82 | 799 | sdata->local = local; |
75636525 JB |
800 | sdata->dev = ndev; |
801 | ||
802 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) | |
803 | skb_queue_head_init(&sdata->fragments[i].skb_list); | |
804 | ||
805 | INIT_LIST_HEAD(&sdata->key_list); | |
806 | ||
807 | sdata->force_unicast_rateidx = -1; | |
808 | sdata->max_ratectrl_rateidx = -1; | |
809 | ||
810 | /* setup type-dependent data */ | |
811 | ieee80211_setup_sdata(sdata, type); | |
f0706e82 JB |
812 | |
813 | ret = register_netdevice(ndev); | |
814 | if (ret) | |
815 | goto fail; | |
816 | ||
902acc78 JB |
817 | if (ieee80211_vif_is_mesh(&sdata->vif) && |
818 | params && params->mesh_id_len) | |
472dbc45 JB |
819 | ieee80211_sdata_set_mesh_id(sdata, |
820 | params->mesh_id_len, | |
821 | params->mesh_id); | |
ee385855 | 822 | |
c771c9d8 | 823 | mutex_lock(&local->iflist_mtx); |
79010420 | 824 | list_add_tail_rcu(&sdata->list, &local->interfaces); |
c771c9d8 | 825 | mutex_unlock(&local->iflist_mtx); |
79010420 | 826 | |
f0706e82 JB |
827 | if (new_dev) |
828 | *new_dev = ndev; | |
f0706e82 | 829 | |
f0706e82 JB |
830 | return 0; |
831 | ||
75636525 | 832 | fail: |
f0706e82 JB |
833 | free_netdev(ndev); |
834 | return ret; | |
835 | } | |
836 | ||
f698d856 | 837 | void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) |
f0706e82 | 838 | { |
f0706e82 | 839 | ASSERT_RTNL(); |
11a843b7 | 840 | |
c771c9d8 | 841 | mutex_lock(&sdata->local->iflist_mtx); |
75636525 | 842 | list_del_rcu(&sdata->list); |
c771c9d8 JB |
843 | mutex_unlock(&sdata->local->iflist_mtx); |
844 | ||
75636525 | 845 | synchronize_rcu(); |
f698d856 | 846 | unregister_netdevice(sdata->dev); |
f0706e82 JB |
847 | } |
848 | ||
75636525 JB |
849 | /* |
850 | * Remove all interfaces, may only be called at hardware unregistration | |
851 | * time because it doesn't do RCU-safe list removals. | |
852 | */ | |
853 | void ieee80211_remove_interfaces(struct ieee80211_local *local) | |
f0706e82 | 854 | { |
75636525 | 855 | struct ieee80211_sub_if_data *sdata, *tmp; |
f0706e82 JB |
856 | |
857 | ASSERT_RTNL(); | |
858 | ||
75636525 | 859 | list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { |
c771c9d8 JB |
860 | /* |
861 | * we cannot hold the iflist_mtx across unregister_netdevice, | |
862 | * but we only need to hold it for list modifications to lock | |
863 | * out readers since we're under the RTNL here as all other | |
864 | * writers. | |
865 | */ | |
866 | mutex_lock(&local->iflist_mtx); | |
75636525 | 867 | list_del(&sdata->list); |
c771c9d8 JB |
868 | mutex_unlock(&local->iflist_mtx); |
869 | ||
75636525 | 870 | unregister_netdevice(sdata->dev); |
f0706e82 | 871 | } |
f0706e82 | 872 | } |
5cff20e6 JB |
873 | |
874 | static u32 ieee80211_idle_off(struct ieee80211_local *local, | |
875 | const char *reason) | |
876 | { | |
877 | if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) | |
878 | return 0; | |
879 | ||
880 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
881 | printk(KERN_DEBUG "%s: device no longer idle - %s\n", | |
882 | wiphy_name(local->hw.wiphy), reason); | |
883 | #endif | |
884 | ||
885 | local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; | |
886 | return IEEE80211_CONF_CHANGE_IDLE; | |
887 | } | |
888 | ||
889 | static u32 ieee80211_idle_on(struct ieee80211_local *local) | |
890 | { | |
891 | if (local->hw.conf.flags & IEEE80211_CONF_IDLE) | |
892 | return 0; | |
893 | ||
894 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
895 | printk(KERN_DEBUG "%s: device now idle\n", | |
896 | wiphy_name(local->hw.wiphy)); | |
897 | #endif | |
898 | ||
899 | local->hw.conf.flags |= IEEE80211_CONF_IDLE; | |
900 | return IEEE80211_CONF_CHANGE_IDLE; | |
901 | } | |
902 | ||
903 | u32 __ieee80211_recalc_idle(struct ieee80211_local *local) | |
904 | { | |
905 | struct ieee80211_sub_if_data *sdata; | |
906 | int count = 0; | |
907 | ||
908 | if (local->hw_scanning || local->sw_scanning) | |
909 | return ieee80211_idle_off(local, "scanning"); | |
910 | ||
911 | list_for_each_entry(sdata, &local->interfaces, list) { | |
912 | if (!netif_running(sdata->dev)) | |
913 | continue; | |
914 | /* do not count disabled managed interfaces */ | |
915 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
77fdaa12 JB |
916 | !sdata->u.mgd.associated && |
917 | list_empty(&sdata->u.mgd.work_list)) | |
5cff20e6 JB |
918 | continue; |
919 | /* do not count unused IBSS interfaces */ | |
920 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && | |
921 | !sdata->u.ibss.ssid_len) | |
922 | continue; | |
923 | /* count everything else */ | |
924 | count++; | |
925 | } | |
926 | ||
927 | if (!count) | |
928 | return ieee80211_idle_on(local); | |
929 | else | |
930 | return ieee80211_idle_off(local, "in use"); | |
931 | ||
932 | return 0; | |
933 | } | |
934 | ||
935 | void ieee80211_recalc_idle(struct ieee80211_local *local) | |
936 | { | |
937 | u32 chg; | |
938 | ||
939 | mutex_lock(&local->iflist_mtx); | |
940 | chg = __ieee80211_recalc_idle(local); | |
941 | mutex_unlock(&local->iflist_mtx); | |
58905ca5 JB |
942 | if (chg) |
943 | ieee80211_hw_config(local, chg); | |
5cff20e6 | 944 | } |