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