Version:  2.0.40 2.2.26 2.4.37 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 3.15

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

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