Version:  2.6.34 2.6.35 2.6.36 2.6.37 2.6.38 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14

Linux/net/mac80211/iface.c

  1 /*
  2  * Interface handling
  3  *
  4  * Copyright 2002-2005, Instant802 Networks, Inc.
  5  * Copyright 2005-2006, Devicescape Software, Inc.
  6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
  7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
  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/slab.h>
 14 #include <linux/kernel.h>
 15 #include <linux/if_arp.h>
 16 #include <linux/netdevice.h>
 17 #include <linux/rtnetlink.h>
 18 #include <net/mac80211.h>
 19 #include <net/ieee80211_radiotap.h>
 20 #include "ieee80211_i.h"
 21 #include "sta_info.h"
 22 #include "debugfs_netdev.h"
 23 #include "mesh.h"
 24 #include "led.h"
 25 #include "driver-ops.h"
 26 #include "wme.h"
 27 #include "rate.h"
 28 
 29 /**
 30  * DOC: Interface list locking
 31  *
 32  * The interface list in each struct ieee80211_local is protected
 33  * three-fold:
 34  *
 35  * (1) modifications may only be done under the RTNL
 36  * (2) modifications and readers are protected against each other by
 37  *     the iflist_mtx.
 38  * (3) modifications are done in an RCU manner so atomic readers
 39  *     can traverse the list in RCU-safe blocks.
 40  *
 41  * As a consequence, reads (traversals) of the list can be protected
 42  * by either the RTNL, the iflist_mtx or RCU.
 43  */
 44 
 45 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
 46 {
 47         struct ieee80211_chanctx_conf *chanctx_conf;
 48         int power;
 49 
 50         rcu_read_lock();
 51         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 52         if (!chanctx_conf) {
 53                 rcu_read_unlock();
 54                 return false;
 55         }
 56 
 57         power = ieee80211_chandef_max_power(&chanctx_conf->def);
 58         rcu_read_unlock();
 59 
 60         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
 61                 power = min(power, sdata->user_power_level);
 62 
 63         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
 64                 power = min(power, sdata->ap_power_level);
 65 
 66         if (power != sdata->vif.bss_conf.txpower) {
 67                 sdata->vif.bss_conf.txpower = power;
 68                 ieee80211_hw_config(sdata->local, 0);
 69                 return true;
 70         }
 71 
 72         return false;
 73 }
 74 
 75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
 76 {
 77         if (__ieee80211_recalc_txpower(sdata))
 78                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
 79 }
 80 
 81 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
 82 {
 83         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 84                 return 0;
 85 
 86         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 87         return IEEE80211_CONF_CHANGE_IDLE;
 88 }
 89 
 90 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
 91 {
 92         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 93                 return 0;
 94 
 95         ieee80211_flush_queues(local, NULL);
 96 
 97         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 98         return IEEE80211_CONF_CHANGE_IDLE;
 99 }
100 
101 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
102                                    bool force_active)
103 {
104         bool working = false, scanning, active;
105         unsigned int led_trig_start = 0, led_trig_stop = 0;
106         struct ieee80211_roc_work *roc;
107 
108         lockdep_assert_held(&local->mtx);
109 
110         active = force_active ||
111                  !list_empty(&local->chanctx_list) ||
112                  local->monitors;
113 
114         if (!local->ops->remain_on_channel) {
115                 list_for_each_entry(roc, &local->roc_list, list) {
116                         working = true;
117                         break;
118                 }
119         }
120 
121         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
122                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
123 
124         if (working || scanning)
125                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126         else
127                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
128 
129         if (active)
130                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131         else
132                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
133 
134         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
135 
136         if (working || scanning || active)
137                 return __ieee80211_idle_off(local);
138         return __ieee80211_idle_on(local);
139 }
140 
141 u32 ieee80211_idle_off(struct ieee80211_local *local)
142 {
143         return __ieee80211_recalc_idle(local, true);
144 }
145 
146 void ieee80211_recalc_idle(struct ieee80211_local *local)
147 {
148         u32 change = __ieee80211_recalc_idle(local, false);
149         if (change)
150                 ieee80211_hw_config(local, change);
151 }
152 
153 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
154 {
155         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
156                 return -EINVAL;
157 
158         dev->mtu = new_mtu;
159         return 0;
160 }
161 
162 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
163                                 bool check_dup)
164 {
165         struct ieee80211_local *local = sdata->local;
166         struct ieee80211_sub_if_data *iter;
167         u64 new, mask, tmp;
168         u8 *m;
169         int ret = 0;
170 
171         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
172                 return 0;
173 
174         m = addr;
175         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
176                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
177                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
178 
179         m = local->hw.wiphy->addr_mask;
180         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
181                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
182                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
183 
184         if (!check_dup)
185                 return ret;
186 
187         mutex_lock(&local->iflist_mtx);
188         list_for_each_entry(iter, &local->interfaces, list) {
189                 if (iter == sdata)
190                         continue;
191 
192                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
193                     !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
194                         continue;
195 
196                 m = iter->vif.addr;
197                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
198                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
199                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
200 
201                 if ((new & ~mask) != (tmp & ~mask)) {
202                         ret = -EINVAL;
203                         break;
204                 }
205         }
206         mutex_unlock(&local->iflist_mtx);
207 
208         return ret;
209 }
210 
211 static int ieee80211_change_mac(struct net_device *dev, void *addr)
212 {
213         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
214         struct sockaddr *sa = addr;
215         bool check_dup = true;
216         int ret;
217 
218         if (ieee80211_sdata_running(sdata))
219                 return -EBUSY;
220 
221         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
222             !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
223                 check_dup = false;
224 
225         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
226         if (ret)
227                 return ret;
228 
229         ret = eth_mac_addr(dev, sa);
230 
231         if (ret == 0)
232                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
233 
234         return ret;
235 }
236 
237 static inline int identical_mac_addr_allowed(int type1, int type2)
238 {
239         return type1 == NL80211_IFTYPE_MONITOR ||
240                 type2 == NL80211_IFTYPE_MONITOR ||
241                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
242                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
243                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
244                 (type1 == NL80211_IFTYPE_WDS &&
245                         (type2 == NL80211_IFTYPE_WDS ||
246                          type2 == NL80211_IFTYPE_AP)) ||
247                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
248                 (type1 == NL80211_IFTYPE_AP_VLAN &&
249                         (type2 == NL80211_IFTYPE_AP ||
250                          type2 == NL80211_IFTYPE_AP_VLAN));
251 }
252 
253 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
254                                             enum nl80211_iftype iftype)
255 {
256         struct ieee80211_local *local = sdata->local;
257         struct ieee80211_sub_if_data *nsdata;
258 
259         ASSERT_RTNL();
260 
261         /* we hold the RTNL here so can safely walk the list */
262         list_for_each_entry(nsdata, &local->interfaces, list) {
263                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
264                         /*
265                          * Allow only a single IBSS interface to be up at any
266                          * time. This is restricted because beacon distribution
267                          * cannot work properly if both are in the same IBSS.
268                          *
269                          * To remove this restriction we'd have to disallow them
270                          * from setting the same SSID on different IBSS interfaces
271                          * belonging to the same hardware. Then, however, we're
272                          * faced with having to adopt two different TSF timers...
273                          */
274                         if (iftype == NL80211_IFTYPE_ADHOC &&
275                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
276                                 return -EBUSY;
277                         /*
278                          * will not add another interface while any channel
279                          * switch is active.
280                          */
281                         if (nsdata->vif.csa_active)
282                                 return -EBUSY;
283 
284                         /*
285                          * The remaining checks are only performed for interfaces
286                          * with the same MAC address.
287                          */
288                         if (!ether_addr_equal(sdata->vif.addr,
289                                               nsdata->vif.addr))
290                                 continue;
291 
292                         /*
293                          * check whether it may have the same address
294                          */
295                         if (!identical_mac_addr_allowed(iftype,
296                                                         nsdata->vif.type))
297                                 return -ENOTUNIQ;
298 
299                         /*
300                          * can only add VLANs to enabled APs
301                          */
302                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
303                             nsdata->vif.type == NL80211_IFTYPE_AP)
304                                 sdata->bss = &nsdata->u.ap;
305                 }
306         }
307 
308         return 0;
309 }
310 
311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
312                                   enum nl80211_iftype iftype)
313 {
314         int n_queues = sdata->local->hw.queues;
315         int i;
316 
317         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
318                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
319                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
320                                          IEEE80211_INVAL_HW_QUEUE))
321                                 return -EINVAL;
322                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
323                                          n_queues))
324                                 return -EINVAL;
325                 }
326         }
327 
328         if ((iftype != NL80211_IFTYPE_AP &&
329              iftype != NL80211_IFTYPE_P2P_GO &&
330              iftype != NL80211_IFTYPE_MESH_POINT) ||
331             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
332                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
333                 return 0;
334         }
335 
336         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
337                 return -EINVAL;
338 
339         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
340                 return -EINVAL;
341 
342         return 0;
343 }
344 
345 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
346                                     const int offset)
347 {
348         struct ieee80211_local *local = sdata->local;
349         u32 flags = sdata->u.mntr_flags;
350 
351 #define ADJUST(_f, _s)  do {                                    \
352         if (flags & MONITOR_FLAG_##_f)                          \
353                 local->fif_##_s += offset;                      \
354         } while (0)
355 
356         ADJUST(FCSFAIL, fcsfail);
357         ADJUST(PLCPFAIL, plcpfail);
358         ADJUST(CONTROL, control);
359         ADJUST(CONTROL, pspoll);
360         ADJUST(OTHER_BSS, other_bss);
361 
362 #undef ADJUST
363 }
364 
365 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
366 {
367         struct ieee80211_local *local = sdata->local;
368         int i;
369 
370         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
371                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
372                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
373                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
374                         sdata->vif.hw_queue[i] = i;
375                 else
376                         sdata->vif.hw_queue[i] = 0;
377         }
378         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
379 }
380 
381 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
382 {
383         struct ieee80211_sub_if_data *sdata;
384         int ret;
385 
386         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
387                 return 0;
388 
389         ASSERT_RTNL();
390 
391         if (local->monitor_sdata)
392                 return 0;
393 
394         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
395         if (!sdata)
396                 return -ENOMEM;
397 
398         /* set up data */
399         sdata->local = local;
400         sdata->vif.type = NL80211_IFTYPE_MONITOR;
401         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
402                  wiphy_name(local->hw.wiphy));
403 
404         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
405 
406         ieee80211_set_default_queues(sdata);
407 
408         ret = drv_add_interface(local, sdata);
409         if (WARN_ON(ret)) {
410                 /* ok .. stupid driver, it asked for this! */
411                 kfree(sdata);
412                 return ret;
413         }
414 
415         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
416         if (ret) {
417                 kfree(sdata);
418                 return ret;
419         }
420 
421         mutex_lock(&local->iflist_mtx);
422         rcu_assign_pointer(local->monitor_sdata, sdata);
423         mutex_unlock(&local->iflist_mtx);
424 
425         mutex_lock(&local->mtx);
426         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
427                                         IEEE80211_CHANCTX_EXCLUSIVE);
428         mutex_unlock(&local->mtx);
429         if (ret) {
430                 mutex_lock(&local->iflist_mtx);
431                 rcu_assign_pointer(local->monitor_sdata, NULL);
432                 mutex_unlock(&local->iflist_mtx);
433                 synchronize_net();
434                 drv_remove_interface(local, sdata);
435                 kfree(sdata);
436                 return ret;
437         }
438 
439         return 0;
440 }
441 
442 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
443 {
444         struct ieee80211_sub_if_data *sdata;
445 
446         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
447                 return;
448 
449         ASSERT_RTNL();
450 
451         mutex_lock(&local->iflist_mtx);
452 
453         sdata = rcu_dereference_protected(local->monitor_sdata,
454                                           lockdep_is_held(&local->iflist_mtx));
455         if (!sdata) {
456                 mutex_unlock(&local->iflist_mtx);
457                 return;
458         }
459 
460         rcu_assign_pointer(local->monitor_sdata, NULL);
461         mutex_unlock(&local->iflist_mtx);
462 
463         synchronize_net();
464 
465         mutex_lock(&local->mtx);
466         ieee80211_vif_release_channel(sdata);
467         mutex_unlock(&local->mtx);
468 
469         drv_remove_interface(local, sdata);
470 
471         kfree(sdata);
472 }
473 
474 /*
475  * NOTE: Be very careful when changing this function, it must NOT return
476  * an error on interface type changes that have been pre-checked, so most
477  * checks should be in ieee80211_check_concurrent_iface.
478  */
479 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
480 {
481         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
482         struct net_device *dev = wdev->netdev;
483         struct ieee80211_local *local = sdata->local;
484         struct sta_info *sta;
485         u32 changed = 0;
486         int res;
487         u32 hw_reconf_flags = 0;
488 
489         switch (sdata->vif.type) {
490         case NL80211_IFTYPE_WDS:
491                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
492                         return -ENOLINK;
493                 break;
494         case NL80211_IFTYPE_AP_VLAN: {
495                 struct ieee80211_sub_if_data *master;
496 
497                 if (!sdata->bss)
498                         return -ENOLINK;
499 
500                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
501 
502                 master = container_of(sdata->bss,
503                                       struct ieee80211_sub_if_data, u.ap);
504                 sdata->control_port_protocol =
505                         master->control_port_protocol;
506                 sdata->control_port_no_encrypt =
507                         master->control_port_no_encrypt;
508                 sdata->vif.cab_queue = master->vif.cab_queue;
509                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
510                        sizeof(sdata->vif.hw_queue));
511                 break;
512                 }
513         case NL80211_IFTYPE_AP:
514                 sdata->bss = &sdata->u.ap;
515                 break;
516         case NL80211_IFTYPE_MESH_POINT:
517         case NL80211_IFTYPE_STATION:
518         case NL80211_IFTYPE_MONITOR:
519         case NL80211_IFTYPE_ADHOC:
520         case NL80211_IFTYPE_P2P_DEVICE:
521                 /* no special treatment */
522                 break;
523         case NL80211_IFTYPE_UNSPECIFIED:
524         case NUM_NL80211_IFTYPES:
525         case NL80211_IFTYPE_P2P_CLIENT:
526         case NL80211_IFTYPE_P2P_GO:
527                 /* cannot happen */
528                 WARN_ON(1);
529                 break;
530         }
531 
532         if (local->open_count == 0) {
533                 res = drv_start(local);
534                 if (res)
535                         goto err_del_bss;
536                 /* we're brought up, everything changes */
537                 hw_reconf_flags = ~0;
538                 ieee80211_led_radio(local, true);
539                 ieee80211_mod_tpt_led_trig(local,
540                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
541         }
542 
543         /*
544          * Copy the hopefully now-present MAC address to
545          * this interface, if it has the special null one.
546          */
547         if (dev && is_zero_ether_addr(dev->dev_addr)) {
548                 memcpy(dev->dev_addr,
549                        local->hw.wiphy->perm_addr,
550                        ETH_ALEN);
551                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
552 
553                 if (!is_valid_ether_addr(dev->dev_addr)) {
554                         res = -EADDRNOTAVAIL;
555                         goto err_stop;
556                 }
557         }
558 
559         switch (sdata->vif.type) {
560         case NL80211_IFTYPE_AP_VLAN:
561                 /* no need to tell driver, but set carrier and chanctx */
562                 if (rtnl_dereference(sdata->bss->beacon)) {
563                         ieee80211_vif_vlan_copy_chanctx(sdata);
564                         netif_carrier_on(dev);
565                 } else {
566                         netif_carrier_off(dev);
567                 }
568                 break;
569         case NL80211_IFTYPE_MONITOR:
570                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
571                         local->cooked_mntrs++;
572                         break;
573                 }
574 
575                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
576                         res = drv_add_interface(local, sdata);
577                         if (res)
578                                 goto err_stop;
579                 } else if (local->monitors == 0 && local->open_count == 0) {
580                         res = ieee80211_add_virtual_monitor(local);
581                         if (res)
582                                 goto err_stop;
583                 }
584 
585                 /* must be before the call to ieee80211_configure_filter */
586                 local->monitors++;
587                 if (local->monitors == 1) {
588                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
589                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
590                 }
591 
592                 ieee80211_adjust_monitor_flags(sdata, 1);
593                 ieee80211_configure_filter(local);
594                 mutex_lock(&local->mtx);
595                 ieee80211_recalc_idle(local);
596                 mutex_unlock(&local->mtx);
597 
598                 netif_carrier_on(dev);
599                 break;
600         default:
601                 if (coming_up) {
602                         ieee80211_del_virtual_monitor(local);
603 
604                         res = drv_add_interface(local, sdata);
605                         if (res)
606                                 goto err_stop;
607                         res = ieee80211_check_queues(sdata,
608                                 ieee80211_vif_type_p2p(&sdata->vif));
609                         if (res)
610                                 goto err_del_interface;
611                 }
612 
613                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
614                         local->fif_pspoll++;
615                         local->fif_probe_req++;
616 
617                         ieee80211_configure_filter(local);
618                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
619                         local->fif_probe_req++;
620                 }
621 
622                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
623                         changed |= ieee80211_reset_erp_info(sdata);
624                 ieee80211_bss_info_change_notify(sdata, changed);
625 
626                 switch (sdata->vif.type) {
627                 case NL80211_IFTYPE_STATION:
628                 case NL80211_IFTYPE_ADHOC:
629                 case NL80211_IFTYPE_AP:
630                 case NL80211_IFTYPE_MESH_POINT:
631                         netif_carrier_off(dev);
632                         break;
633                 case NL80211_IFTYPE_WDS:
634                 case NL80211_IFTYPE_P2P_DEVICE:
635                         break;
636                 default:
637                         /* not reached */
638                         WARN_ON(1);
639                 }
640 
641                 /*
642                  * set default queue parameters so drivers don't
643                  * need to initialise the hardware if the hardware
644                  * doesn't start up with sane defaults
645                  */
646                 ieee80211_set_wmm_default(sdata, true);
647         }
648 
649         set_bit(SDATA_STATE_RUNNING, &sdata->state);
650 
651         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
652                 /* Create STA entry for the WDS peer */
653                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
654                                      GFP_KERNEL);
655                 if (!sta) {
656                         res = -ENOMEM;
657                         goto err_del_interface;
658                 }
659 
660                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
661                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
662                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
663 
664                 res = sta_info_insert(sta);
665                 if (res) {
666                         /* STA has been freed */
667                         goto err_del_interface;
668                 }
669 
670                 rate_control_rate_init(sta);
671                 netif_carrier_on(dev);
672         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
673                 rcu_assign_pointer(local->p2p_sdata, sdata);
674         }
675 
676         /*
677          * set_multicast_list will be invoked by the networking core
678          * which will check whether any increments here were done in
679          * error and sync them down to the hardware as filter flags.
680          */
681         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
682                 atomic_inc(&local->iff_allmultis);
683 
684         if (sdata->flags & IEEE80211_SDATA_PROMISC)
685                 atomic_inc(&local->iff_promiscs);
686 
687         if (coming_up)
688                 local->open_count++;
689 
690         if (hw_reconf_flags)
691                 ieee80211_hw_config(local, hw_reconf_flags);
692 
693         ieee80211_recalc_ps(local, -1);
694 
695         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
696             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
697                 /* XXX: for AP_VLAN, actually track AP queues */
698                 netif_tx_start_all_queues(dev);
699         } else if (dev) {
700                 unsigned long flags;
701                 int n_acs = IEEE80211_NUM_ACS;
702                 int ac;
703 
704                 if (local->hw.queues < IEEE80211_NUM_ACS)
705                         n_acs = 1;
706 
707                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
708                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
709                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
710                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
711                         for (ac = 0; ac < n_acs; ac++) {
712                                 int ac_queue = sdata->vif.hw_queue[ac];
713 
714                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
715                                     skb_queue_empty(&local->pending[ac_queue]))
716                                         netif_start_subqueue(dev, ac);
717                         }
718                 }
719                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
720         }
721 
722         return 0;
723  err_del_interface:
724         drv_remove_interface(local, sdata);
725  err_stop:
726         if (!local->open_count)
727                 drv_stop(local);
728  err_del_bss:
729         sdata->bss = NULL;
730         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
731                 list_del(&sdata->u.vlan.list);
732         /* might already be clear but that doesn't matter */
733         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
734         return res;
735 }
736 
737 static int ieee80211_open(struct net_device *dev)
738 {
739         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
740         int err;
741 
742         /* fail early if user set an invalid address */
743         if (!is_valid_ether_addr(dev->dev_addr))
744                 return -EADDRNOTAVAIL;
745 
746         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
747         if (err)
748                 return err;
749 
750         return ieee80211_do_open(&sdata->wdev, true);
751 }
752 
753 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
754                               bool going_down)
755 {
756         struct ieee80211_local *local = sdata->local;
757         unsigned long flags;
758         struct sk_buff *skb, *tmp;
759         u32 hw_reconf_flags = 0;
760         int i, flushed;
761         struct ps_data *ps;
762         struct cfg80211_chan_def chandef;
763 
764         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
765 
766         if (rcu_access_pointer(local->scan_sdata) == sdata)
767                 ieee80211_scan_cancel(local);
768 
769         /*
770          * Stop TX on this interface first.
771          */
772         if (sdata->dev)
773                 netif_tx_stop_all_queues(sdata->dev);
774 
775         ieee80211_roc_purge(local, sdata);
776 
777         switch (sdata->vif.type) {
778         case NL80211_IFTYPE_STATION:
779                 ieee80211_mgd_stop(sdata);
780                 break;
781         case NL80211_IFTYPE_ADHOC:
782                 ieee80211_ibss_stop(sdata);
783                 break;
784         case NL80211_IFTYPE_AP:
785                 cancel_work_sync(&sdata->u.ap.request_smps_work);
786                 break;
787         default:
788                 break;
789         }
790 
791         /*
792          * Remove all stations associated with this interface.
793          *
794          * This must be done before calling ops->remove_interface()
795          * because otherwise we can later invoke ops->sta_notify()
796          * whenever the STAs are removed, and that invalidates driver
797          * assumptions about always getting a vif pointer that is valid
798          * (because if we remove a STA after ops->remove_interface()
799          * the driver will have removed the vif info already!)
800          *
801          * This is relevant only in WDS mode, in all other modes we've
802          * already removed all stations when disconnecting or similar,
803          * so warn otherwise.
804          */
805         flushed = sta_info_flush(sdata);
806         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
807                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
808 
809         /* don't count this interface for promisc/allmulti while it is down */
810         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
811                 atomic_dec(&local->iff_allmultis);
812 
813         if (sdata->flags & IEEE80211_SDATA_PROMISC)
814                 atomic_dec(&local->iff_promiscs);
815 
816         if (sdata->vif.type == NL80211_IFTYPE_AP) {
817                 local->fif_pspoll--;
818                 local->fif_probe_req--;
819         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
820                 local->fif_probe_req--;
821         }
822 
823         if (sdata->dev) {
824                 netif_addr_lock_bh(sdata->dev);
825                 spin_lock_bh(&local->filter_lock);
826                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
827                                  sdata->dev->addr_len);
828                 spin_unlock_bh(&local->filter_lock);
829                 netif_addr_unlock_bh(sdata->dev);
830         }
831 
832         del_timer_sync(&local->dynamic_ps_timer);
833         cancel_work_sync(&local->dynamic_ps_enable_work);
834 
835         cancel_work_sync(&sdata->recalc_smps);
836         sdata->vif.csa_active = false;
837         cancel_work_sync(&sdata->csa_finalize_work);
838 
839         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
840 
841         if (sdata->wdev.cac_started) {
842                 chandef = sdata->vif.bss_conf.chandef;
843                 WARN_ON(local->suspended);
844                 mutex_lock(&local->mtx);
845                 ieee80211_vif_release_channel(sdata);
846                 mutex_unlock(&local->mtx);
847                 cfg80211_cac_event(sdata->dev, &chandef,
848                                    NL80211_RADAR_CAC_ABORTED,
849                                    GFP_KERNEL);
850         }
851 
852         /* APs need special treatment */
853         if (sdata->vif.type == NL80211_IFTYPE_AP) {
854                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
855 
856                 /* down all dependent devices, that is VLANs */
857                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
858                                          u.vlan.list)
859                         dev_close(vlan->dev);
860                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
861         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
862                 /* remove all packets in parent bc_buf pointing to this dev */
863                 ps = &sdata->bss->ps;
864 
865                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
866                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
867                         if (skb->dev == sdata->dev) {
868                                 __skb_unlink(skb, &ps->bc_buf);
869                                 local->total_ps_buffered--;
870                                 ieee80211_free_txskb(&local->hw, skb);
871                         }
872                 }
873                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
874         }
875 
876         if (going_down)
877                 local->open_count--;
878 
879         switch (sdata->vif.type) {
880         case NL80211_IFTYPE_AP_VLAN:
881                 list_del(&sdata->u.vlan.list);
882                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
883                 /* no need to tell driver */
884                 break;
885         case NL80211_IFTYPE_MONITOR:
886                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
887                         local->cooked_mntrs--;
888                         break;
889                 }
890 
891                 local->monitors--;
892                 if (local->monitors == 0) {
893                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
894                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
895                 }
896 
897                 ieee80211_adjust_monitor_flags(sdata, -1);
898                 break;
899         case NL80211_IFTYPE_P2P_DEVICE:
900                 /* relies on synchronize_rcu() below */
901                 rcu_assign_pointer(local->p2p_sdata, NULL);
902                 /* fall through */
903         default:
904                 cancel_work_sync(&sdata->work);
905                 /*
906                  * When we get here, the interface is marked down.
907                  * Free the remaining keys, if there are any
908                  * (shouldn't be, except maybe in WDS mode?)
909                  *
910                  * Force the key freeing to always synchronize_net()
911                  * to wait for the RX path in case it is using this
912                  * interface enqueuing frames * at this very time on
913                  * another CPU.
914                  */
915                 ieee80211_free_keys(sdata, true);
916 
917                 /* fall through */
918         case NL80211_IFTYPE_AP:
919                 skb_queue_purge(&sdata->skb_queue);
920         }
921 
922         sdata->bss = NULL;
923 
924         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
925         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
926                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
927                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
928                         if (info->control.vif == &sdata->vif) {
929                                 __skb_unlink(skb, &local->pending[i]);
930                                 ieee80211_free_txskb(&local->hw, skb);
931                         }
932                 }
933         }
934         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
935 
936         if (local->open_count == 0)
937                 ieee80211_clear_tx_pending(local);
938 
939         /*
940          * If the interface goes down while suspended, presumably because
941          * the device was unplugged and that happens before our resume,
942          * then the driver is already unconfigured and the remainder of
943          * this function isn't needed.
944          * XXX: what about WoWLAN? If the device has software state, e.g.
945          *      memory allocated, it might expect teardown commands from
946          *      mac80211 here?
947          */
948         if (local->suspended) {
949                 WARN_ON(local->wowlan);
950                 WARN_ON(rtnl_dereference(local->monitor_sdata));
951                 return;
952         }
953 
954         switch (sdata->vif.type) {
955         case NL80211_IFTYPE_AP_VLAN:
956                 break;
957         case NL80211_IFTYPE_MONITOR:
958                 if (local->monitors == 0)
959                         ieee80211_del_virtual_monitor(local);
960 
961                 mutex_lock(&local->mtx);
962                 ieee80211_recalc_idle(local);
963                 mutex_unlock(&local->mtx);
964 
965                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
966                         break;
967 
968                 /* fall through */
969         default:
970                 if (going_down)
971                         drv_remove_interface(local, sdata);
972         }
973 
974         ieee80211_recalc_ps(local, -1);
975 
976         if (local->open_count == 0) {
977                 ieee80211_stop_device(local);
978 
979                 /* no reconfiguring after stop! */
980                 return;
981         }
982 
983         /* do after stop to avoid reconfiguring when we stop anyway */
984         ieee80211_configure_filter(local);
985         ieee80211_hw_config(local, hw_reconf_flags);
986 
987         if (local->monitors == local->open_count)
988                 ieee80211_add_virtual_monitor(local);
989 }
990 
991 static int ieee80211_stop(struct net_device *dev)
992 {
993         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
994 
995         ieee80211_do_stop(sdata, true);
996 
997         return 0;
998 }
999 
1000 static void ieee80211_set_multicast_list(struct net_device *dev)
1001 {
1002         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1003         struct ieee80211_local *local = sdata->local;
1004         int allmulti, promisc, sdata_allmulti, sdata_promisc;
1005 
1006         allmulti = !!(dev->flags & IFF_ALLMULTI);
1007         promisc = !!(dev->flags & IFF_PROMISC);
1008         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1009         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1010 
1011         if (allmulti != sdata_allmulti) {
1012                 if (dev->flags & IFF_ALLMULTI)
1013                         atomic_inc(&local->iff_allmultis);
1014                 else
1015                         atomic_dec(&local->iff_allmultis);
1016                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1017         }
1018 
1019         if (promisc != sdata_promisc) {
1020                 if (dev->flags & IFF_PROMISC)
1021                         atomic_inc(&local->iff_promiscs);
1022                 else
1023                         atomic_dec(&local->iff_promiscs);
1024                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1025         }
1026         spin_lock_bh(&local->filter_lock);
1027         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1028         spin_unlock_bh(&local->filter_lock);
1029         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1030 }
1031 
1032 /*
1033  * Called when the netdev is removed or, by the code below, before
1034  * the interface type changes.
1035  */
1036 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1037 {
1038         int i;
1039 
1040         /* free extra data */
1041         ieee80211_free_keys(sdata, false);
1042 
1043         ieee80211_debugfs_remove_netdev(sdata);
1044 
1045         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1046                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1047         sdata->fragment_next = 0;
1048 
1049         if (ieee80211_vif_is_mesh(&sdata->vif))
1050                 mesh_rmc_free(sdata);
1051 }
1052 
1053 static void ieee80211_uninit(struct net_device *dev)
1054 {
1055         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1056 }
1057 
1058 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1059                                          struct sk_buff *skb,
1060                                          void *accel_priv,
1061                                          select_queue_fallback_t fallback)
1062 {
1063         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1064 }
1065 
1066 static const struct net_device_ops ieee80211_dataif_ops = {
1067         .ndo_open               = ieee80211_open,
1068         .ndo_stop               = ieee80211_stop,
1069         .ndo_uninit             = ieee80211_uninit,
1070         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1071         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1072         .ndo_change_mtu         = ieee80211_change_mtu,
1073         .ndo_set_mac_address    = ieee80211_change_mac,
1074         .ndo_select_queue       = ieee80211_netdev_select_queue,
1075 };
1076 
1077 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1078                                           struct sk_buff *skb,
1079                                           void *accel_priv,
1080                                           select_queue_fallback_t fallback)
1081 {
1082         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1083         struct ieee80211_local *local = sdata->local;
1084         struct ieee80211_hdr *hdr;
1085         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1086 
1087         if (local->hw.queues < IEEE80211_NUM_ACS)
1088                 return 0;
1089 
1090         if (skb->len < 4 ||
1091             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1092                 return 0; /* doesn't matter, frame will be dropped */
1093 
1094         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1095 
1096         return ieee80211_select_queue_80211(sdata, skb, hdr);
1097 }
1098 
1099 static const struct net_device_ops ieee80211_monitorif_ops = {
1100         .ndo_open               = ieee80211_open,
1101         .ndo_stop               = ieee80211_stop,
1102         .ndo_uninit             = ieee80211_uninit,
1103         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1104         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1105         .ndo_change_mtu         = ieee80211_change_mtu,
1106         .ndo_set_mac_address    = ieee80211_change_mac,
1107         .ndo_select_queue       = ieee80211_monitor_select_queue,
1108 };
1109 
1110 static void ieee80211_if_setup(struct net_device *dev)
1111 {
1112         ether_setup(dev);
1113         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1114         dev->netdev_ops = &ieee80211_dataif_ops;
1115         dev->destructor = free_netdev;
1116 }
1117 
1118 static void ieee80211_iface_work(struct work_struct *work)
1119 {
1120         struct ieee80211_sub_if_data *sdata =
1121                 container_of(work, struct ieee80211_sub_if_data, work);
1122         struct ieee80211_local *local = sdata->local;
1123         struct sk_buff *skb;
1124         struct sta_info *sta;
1125         struct ieee80211_ra_tid *ra_tid;
1126 
1127         if (!ieee80211_sdata_running(sdata))
1128                 return;
1129 
1130         if (local->scanning)
1131                 return;
1132 
1133         /*
1134          * ieee80211_queue_work() should have picked up most cases,
1135          * here we'll pick the rest.
1136          */
1137         if (WARN(local->suspended,
1138                  "interface work scheduled while going to suspend\n"))
1139                 return;
1140 
1141         /* first process frames */
1142         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1143                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1144 
1145                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1146                         ra_tid = (void *)&skb->cb;
1147                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1148                                                  ra_tid->tid);
1149                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1150                         ra_tid = (void *)&skb->cb;
1151                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1152                                                 ra_tid->tid);
1153                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1154                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1155                         int len = skb->len;
1156 
1157                         mutex_lock(&local->sta_mtx);
1158                         sta = sta_info_get_bss(sdata, mgmt->sa);
1159                         if (sta) {
1160                                 switch (mgmt->u.action.u.addba_req.action_code) {
1161                                 case WLAN_ACTION_ADDBA_REQ:
1162                                         ieee80211_process_addba_request(
1163                                                         local, sta, mgmt, len);
1164                                         break;
1165                                 case WLAN_ACTION_ADDBA_RESP:
1166                                         ieee80211_process_addba_resp(local, sta,
1167                                                                      mgmt, len);
1168                                         break;
1169                                 case WLAN_ACTION_DELBA:
1170                                         ieee80211_process_delba(sdata, sta,
1171                                                                 mgmt, len);
1172                                         break;
1173                                 default:
1174                                         WARN_ON(1);
1175                                         break;
1176                                 }
1177                         }
1178                         mutex_unlock(&local->sta_mtx);
1179                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1180                         struct ieee80211_hdr *hdr = (void *)mgmt;
1181                         /*
1182                          * So the frame isn't mgmt, but frame_control
1183                          * is at the right place anyway, of course, so
1184                          * the if statement is correct.
1185                          *
1186                          * Warn if we have other data frame types here,
1187                          * they must not get here.
1188                          */
1189                         WARN_ON(hdr->frame_control &
1190                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1191                         WARN_ON(!(hdr->seq_ctrl &
1192                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1193                         /*
1194                          * This was a fragment of a frame, received while
1195                          * a block-ack session was active. That cannot be
1196                          * right, so terminate the session.
1197                          */
1198                         mutex_lock(&local->sta_mtx);
1199                         sta = sta_info_get_bss(sdata, mgmt->sa);
1200                         if (sta) {
1201                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1202                                                 IEEE80211_QOS_CTL_TID_MASK;
1203 
1204                                 __ieee80211_stop_rx_ba_session(
1205                                         sta, tid, WLAN_BACK_RECIPIENT,
1206                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1207                                         true);
1208                         }
1209                         mutex_unlock(&local->sta_mtx);
1210                 } else switch (sdata->vif.type) {
1211                 case NL80211_IFTYPE_STATION:
1212                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1213                         break;
1214                 case NL80211_IFTYPE_ADHOC:
1215                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1216                         break;
1217                 case NL80211_IFTYPE_MESH_POINT:
1218                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1219                                 break;
1220                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1221                         break;
1222                 default:
1223                         WARN(1, "frame for unexpected interface type");
1224                         break;
1225                 }
1226 
1227                 kfree_skb(skb);
1228         }
1229 
1230         /* then other type-dependent work */
1231         switch (sdata->vif.type) {
1232         case NL80211_IFTYPE_STATION:
1233                 ieee80211_sta_work(sdata);
1234                 break;
1235         case NL80211_IFTYPE_ADHOC:
1236                 ieee80211_ibss_work(sdata);
1237                 break;
1238         case NL80211_IFTYPE_MESH_POINT:
1239                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1240                         break;
1241                 ieee80211_mesh_work(sdata);
1242                 break;
1243         default:
1244                 break;
1245         }
1246 }
1247 
1248 static void ieee80211_recalc_smps_work(struct work_struct *work)
1249 {
1250         struct ieee80211_sub_if_data *sdata =
1251                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1252 
1253         ieee80211_recalc_smps(sdata);
1254 }
1255 
1256 /*
1257  * Helper function to initialise an interface to a specific type.
1258  */
1259 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1260                                   enum nl80211_iftype type)
1261 {
1262         /* clear type-dependent union */
1263         memset(&sdata->u, 0, sizeof(sdata->u));
1264 
1265         /* and set some type-dependent values */
1266         sdata->vif.type = type;
1267         sdata->vif.p2p = false;
1268         sdata->wdev.iftype = type;
1269 
1270         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1271         sdata->control_port_no_encrypt = false;
1272         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1273 
1274         sdata->noack_map = 0;
1275 
1276         /* only monitor/p2p-device differ */
1277         if (sdata->dev) {
1278                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1279                 sdata->dev->type = ARPHRD_ETHER;
1280         }
1281 
1282         skb_queue_head_init(&sdata->skb_queue);
1283         INIT_WORK(&sdata->work, ieee80211_iface_work);
1284         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1285         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1286 
1287         switch (type) {
1288         case NL80211_IFTYPE_P2P_GO:
1289                 type = NL80211_IFTYPE_AP;
1290                 sdata->vif.type = type;
1291                 sdata->vif.p2p = true;
1292                 /* fall through */
1293         case NL80211_IFTYPE_AP:
1294                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1295                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1296                 INIT_WORK(&sdata->u.ap.request_smps_work,
1297                           ieee80211_request_smps_ap_work);
1298                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1299                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1300                 break;
1301         case NL80211_IFTYPE_P2P_CLIENT:
1302                 type = NL80211_IFTYPE_STATION;
1303                 sdata->vif.type = type;
1304                 sdata->vif.p2p = true;
1305                 /* fall through */
1306         case NL80211_IFTYPE_STATION:
1307                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1308                 ieee80211_sta_setup_sdata(sdata);
1309                 break;
1310         case NL80211_IFTYPE_ADHOC:
1311                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1312                 ieee80211_ibss_setup_sdata(sdata);
1313                 break;
1314         case NL80211_IFTYPE_MESH_POINT:
1315                 if (ieee80211_vif_is_mesh(&sdata->vif))
1316                         ieee80211_mesh_init_sdata(sdata);
1317                 break;
1318         case NL80211_IFTYPE_MONITOR:
1319                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1320                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1321                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1322                                       MONITOR_FLAG_OTHER_BSS;
1323                 break;
1324         case NL80211_IFTYPE_WDS:
1325                 sdata->vif.bss_conf.bssid = NULL;
1326                 break;
1327         case NL80211_IFTYPE_AP_VLAN:
1328         case NL80211_IFTYPE_P2P_DEVICE:
1329                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1330                 break;
1331         case NL80211_IFTYPE_UNSPECIFIED:
1332         case NUM_NL80211_IFTYPES:
1333                 BUG();
1334                 break;
1335         }
1336 
1337         ieee80211_debugfs_add_netdev(sdata);
1338 }
1339 
1340 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1341                                            enum nl80211_iftype type)
1342 {
1343         struct ieee80211_local *local = sdata->local;
1344         int ret, err;
1345         enum nl80211_iftype internal_type = type;
1346         bool p2p = false;
1347 
1348         ASSERT_RTNL();
1349 
1350         if (!local->ops->change_interface)
1351                 return -EBUSY;
1352 
1353         switch (sdata->vif.type) {
1354         case NL80211_IFTYPE_AP:
1355         case NL80211_IFTYPE_STATION:
1356         case NL80211_IFTYPE_ADHOC:
1357                 /*
1358                  * Could maybe also all others here?
1359                  * Just not sure how that interacts
1360                  * with the RX/config path e.g. for
1361                  * mesh.
1362                  */
1363                 break;
1364         default:
1365                 return -EBUSY;
1366         }
1367 
1368         switch (type) {
1369         case NL80211_IFTYPE_AP:
1370         case NL80211_IFTYPE_STATION:
1371         case NL80211_IFTYPE_ADHOC:
1372                 /*
1373                  * Could probably support everything
1374                  * but WDS here (WDS do_open can fail
1375                  * under memory pressure, which this
1376                  * code isn't prepared to handle).
1377                  */
1378                 break;
1379         case NL80211_IFTYPE_P2P_CLIENT:
1380                 p2p = true;
1381                 internal_type = NL80211_IFTYPE_STATION;
1382                 break;
1383         case NL80211_IFTYPE_P2P_GO:
1384                 p2p = true;
1385                 internal_type = NL80211_IFTYPE_AP;
1386                 break;
1387         default:
1388                 return -EBUSY;
1389         }
1390 
1391         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1392         if (ret)
1393                 return ret;
1394 
1395         ieee80211_do_stop(sdata, false);
1396 
1397         ieee80211_teardown_sdata(sdata);
1398 
1399         ret = drv_change_interface(local, sdata, internal_type, p2p);
1400         if (ret)
1401                 type = ieee80211_vif_type_p2p(&sdata->vif);
1402 
1403         /*
1404          * Ignore return value here, there's not much we can do since
1405          * the driver changed the interface type internally already.
1406          * The warnings will hopefully make driver authors fix it :-)
1407          */
1408         ieee80211_check_queues(sdata, type);
1409 
1410         ieee80211_setup_sdata(sdata, type);
1411 
1412         err = ieee80211_do_open(&sdata->wdev, false);
1413         WARN(err, "type change: do_open returned %d", err);
1414 
1415         return ret;
1416 }
1417 
1418 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1419                              enum nl80211_iftype type)
1420 {
1421         int ret;
1422 
1423         ASSERT_RTNL();
1424 
1425         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1426                 return 0;
1427 
1428         if (ieee80211_sdata_running(sdata)) {
1429                 ret = ieee80211_runtime_change_iftype(sdata, type);
1430                 if (ret)
1431                         return ret;
1432         } else {
1433                 /* Purge and reset type-dependent state. */
1434                 ieee80211_teardown_sdata(sdata);
1435                 ieee80211_setup_sdata(sdata, type);
1436         }
1437 
1438         /* reset some values that shouldn't be kept across type changes */
1439         sdata->drop_unencrypted = 0;
1440         if (type == NL80211_IFTYPE_STATION)
1441                 sdata->u.mgd.use_4addr = false;
1442 
1443         return 0;
1444 }
1445 
1446 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1447                                        u8 *perm_addr, enum nl80211_iftype type)
1448 {
1449         struct ieee80211_sub_if_data *sdata;
1450         u64 mask, start, addr, val, inc;
1451         u8 *m;
1452         u8 tmp_addr[ETH_ALEN];
1453         int i;
1454 
1455         /* default ... something at least */
1456         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1457 
1458         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1459             local->hw.wiphy->n_addresses <= 1)
1460                 return;
1461 
1462         mutex_lock(&local->iflist_mtx);
1463 
1464         switch (type) {
1465         case NL80211_IFTYPE_MONITOR:
1466                 /* doesn't matter */
1467                 break;
1468         case NL80211_IFTYPE_WDS:
1469         case NL80211_IFTYPE_AP_VLAN:
1470                 /* match up with an AP interface */
1471                 list_for_each_entry(sdata, &local->interfaces, list) {
1472                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1473                                 continue;
1474                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1475                         break;
1476                 }
1477                 /* keep default if no AP interface present */
1478                 break;
1479         case NL80211_IFTYPE_P2P_CLIENT:
1480         case NL80211_IFTYPE_P2P_GO:
1481                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1482                         list_for_each_entry(sdata, &local->interfaces, list) {
1483                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1484                                         continue;
1485                                 if (!ieee80211_sdata_running(sdata))
1486                                         continue;
1487                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1488                                 goto out_unlock;
1489                         }
1490                 }
1491                 /* otherwise fall through */
1492         default:
1493                 /* assign a new address if possible -- try n_addresses first */
1494                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1495                         bool used = false;
1496 
1497                         list_for_each_entry(sdata, &local->interfaces, list) {
1498                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1499                                                      sdata->vif.addr)) {
1500                                         used = true;
1501                                         break;
1502                                 }
1503                         }
1504 
1505                         if (!used) {
1506                                 memcpy(perm_addr,
1507                                        local->hw.wiphy->addresses[i].addr,
1508                                        ETH_ALEN);
1509                                 break;
1510                         }
1511                 }
1512 
1513                 /* try mask if available */
1514                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1515                         break;
1516 
1517                 m = local->hw.wiphy->addr_mask;
1518                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1519                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1520                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1521 
1522                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1523                         /* not a contiguous mask ... not handled now! */
1524                         pr_info("not contiguous\n");
1525                         break;
1526                 }
1527 
1528                 /*
1529                  * Pick address of existing interface in case user changed
1530                  * MAC address manually, default to perm_addr.
1531                  */
1532                 m = local->hw.wiphy->perm_addr;
1533                 list_for_each_entry(sdata, &local->interfaces, list) {
1534                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1535                                 continue;
1536                         m = sdata->vif.addr;
1537                         break;
1538                 }
1539                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1540                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1541                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1542 
1543                 inc = 1ULL<<__ffs64(mask);
1544                 val = (start & mask);
1545                 addr = (start & ~mask) | (val & mask);
1546                 do {
1547                         bool used = false;
1548 
1549                         tmp_addr[5] = addr >> 0*8;
1550                         tmp_addr[4] = addr >> 1*8;
1551                         tmp_addr[3] = addr >> 2*8;
1552                         tmp_addr[2] = addr >> 3*8;
1553                         tmp_addr[1] = addr >> 4*8;
1554                         tmp_addr[0] = addr >> 5*8;
1555 
1556                         val += inc;
1557 
1558                         list_for_each_entry(sdata, &local->interfaces, list) {
1559                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1560                                         used = true;
1561                                         break;
1562                                 }
1563                         }
1564 
1565                         if (!used) {
1566                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1567                                 break;
1568                         }
1569                         addr = (start & ~mask) | (val & mask);
1570                 } while (addr != start);
1571 
1572                 break;
1573         }
1574 
1575  out_unlock:
1576         mutex_unlock(&local->iflist_mtx);
1577 }
1578 
1579 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1580                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1581                      struct vif_params *params)
1582 {
1583         struct net_device *ndev = NULL;
1584         struct ieee80211_sub_if_data *sdata = NULL;
1585         int ret, i;
1586         int txqs = 1;
1587 
1588         ASSERT_RTNL();
1589 
1590         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1591                 struct wireless_dev *wdev;
1592 
1593                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1594                                 GFP_KERNEL);
1595                 if (!sdata)
1596                         return -ENOMEM;
1597                 wdev = &sdata->wdev;
1598 
1599                 sdata->dev = NULL;
1600                 strlcpy(sdata->name, name, IFNAMSIZ);
1601                 ieee80211_assign_perm_addr(local, wdev->address, type);
1602                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1603         } else {
1604                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1605                         txqs = IEEE80211_NUM_ACS;
1606 
1607                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1608                                         local->hw.vif_data_size,
1609                                         name, ieee80211_if_setup, txqs, 1);
1610                 if (!ndev)
1611                         return -ENOMEM;
1612                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1613 
1614                 ndev->needed_headroom = local->tx_headroom +
1615                                         4*6 /* four MAC addresses */
1616                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1617                                         + 6 /* mesh */
1618                                         + 8 /* rfc1042/bridge tunnel */
1619                                         - ETH_HLEN /* ethernet hard_header_len */
1620                                         + IEEE80211_ENCRYPT_HEADROOM;
1621                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1622 
1623                 ret = dev_alloc_name(ndev, ndev->name);
1624                 if (ret < 0) {
1625                         free_netdev(ndev);
1626                         return ret;
1627                 }
1628 
1629                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1630                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1631                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1632 
1633                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1634                 sdata = netdev_priv(ndev);
1635                 ndev->ieee80211_ptr = &sdata->wdev;
1636                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1637                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1638 
1639                 sdata->dev = ndev;
1640         }
1641 
1642         /* initialise type-independent data */
1643         sdata->wdev.wiphy = local->hw.wiphy;
1644         sdata->local = local;
1645 
1646         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1647                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1648 
1649         INIT_LIST_HEAD(&sdata->key_list);
1650 
1651         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1652                           ieee80211_dfs_cac_timer_work);
1653         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1654                           ieee80211_delayed_tailroom_dec);
1655 
1656         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1657                 struct ieee80211_supported_band *sband;
1658                 sband = local->hw.wiphy->bands[i];
1659                 sdata->rc_rateidx_mask[i] =
1660                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1661                 if (sband)
1662                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1663                                sband->ht_cap.mcs.rx_mask,
1664                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1665                 else
1666                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1667                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1668         }
1669 
1670         ieee80211_set_default_queues(sdata);
1671 
1672         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1673         sdata->user_power_level = local->user_power_level;
1674 
1675         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1676 
1677         /* setup type-dependent data */
1678         ieee80211_setup_sdata(sdata, type);
1679 
1680         if (ndev) {
1681                 if (params) {
1682                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1683                         if (type == NL80211_IFTYPE_STATION)
1684                                 sdata->u.mgd.use_4addr = params->use_4addr;
1685                 }
1686 
1687                 ndev->features |= local->hw.netdev_features;
1688 
1689                 ret = register_netdevice(ndev);
1690                 if (ret) {
1691                         free_netdev(ndev);
1692                         return ret;
1693                 }
1694         }
1695 
1696         mutex_lock(&local->iflist_mtx);
1697         list_add_tail_rcu(&sdata->list, &local->interfaces);
1698         mutex_unlock(&local->iflist_mtx);
1699 
1700         if (new_wdev)
1701                 *new_wdev = &sdata->wdev;
1702 
1703         return 0;
1704 }
1705 
1706 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1707 {
1708         ASSERT_RTNL();
1709 
1710         mutex_lock(&sdata->local->iflist_mtx);
1711         list_del_rcu(&sdata->list);
1712         mutex_unlock(&sdata->local->iflist_mtx);
1713 
1714         synchronize_rcu();
1715 
1716         if (sdata->dev) {
1717                 unregister_netdevice(sdata->dev);
1718         } else {
1719                 cfg80211_unregister_wdev(&sdata->wdev);
1720                 kfree(sdata);
1721         }
1722 }
1723 
1724 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1725 {
1726         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1727                 return;
1728         ieee80211_do_stop(sdata, true);
1729         ieee80211_teardown_sdata(sdata);
1730 }
1731 
1732 /*
1733  * Remove all interfaces, may only be called at hardware unregistration
1734  * time because it doesn't do RCU-safe list removals.
1735  */
1736 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1737 {
1738         struct ieee80211_sub_if_data *sdata, *tmp;
1739         LIST_HEAD(unreg_list);
1740         LIST_HEAD(wdev_list);
1741 
1742         ASSERT_RTNL();
1743 
1744         /*
1745          * Close all AP_VLAN interfaces first, as otherwise they
1746          * might be closed while the AP interface they belong to
1747          * is closed, causing unregister_netdevice_many() to crash.
1748          */
1749         list_for_each_entry(sdata, &local->interfaces, list)
1750                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1751                         dev_close(sdata->dev);
1752 
1753         mutex_lock(&local->iflist_mtx);
1754         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1755                 list_del(&sdata->list);
1756 
1757                 if (sdata->dev)
1758                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1759                 else
1760                         list_add(&sdata->list, &wdev_list);
1761         }
1762         mutex_unlock(&local->iflist_mtx);
1763         unregister_netdevice_many(&unreg_list);
1764         list_del(&unreg_list);
1765 
1766         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1767                 list_del(&sdata->list);
1768                 cfg80211_unregister_wdev(&sdata->wdev);
1769                 kfree(sdata);
1770         }
1771 }
1772 
1773 static int netdev_notify(struct notifier_block *nb,
1774                          unsigned long state, void *ptr)
1775 {
1776         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1777         struct ieee80211_sub_if_data *sdata;
1778 
1779         if (state != NETDEV_CHANGENAME)
1780                 return 0;
1781 
1782         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1783                 return 0;
1784 
1785         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1786                 return 0;
1787 
1788         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1789 
1790         memcpy(sdata->name, dev->name, IFNAMSIZ);
1791 
1792         ieee80211_debugfs_rename_netdev(sdata);
1793         return 0;
1794 }
1795 
1796 static struct notifier_block mac80211_netdev_notifier = {
1797         .notifier_call = netdev_notify,
1798 };
1799 
1800 int ieee80211_iface_init(void)
1801 {
1802         return register_netdevice_notifier(&mac80211_netdev_notifier);
1803 }
1804 
1805 void ieee80211_iface_exit(void)
1806 {
1807         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1808 }
1809 

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