~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/mac80211/iface.c

Version: ~ [ linux-5.1-rc5 ] ~ [ linux-5.0.7 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.34 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.111 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.168 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.178 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.138 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.65 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * Interface handling (except master interface)
  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 
 46 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 47 {
 48         int meshhdrlen;
 49         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 50 
 51         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
 52 
 53         /* FIX: what would be proper limits for MTU?
 54          * This interface uses 802.3 frames. */
 55         if (new_mtu < 256 ||
 56             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
 57                 return -EINVAL;
 58         }
 59 
 60 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 61         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
 62 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 63         dev->mtu = new_mtu;
 64         return 0;
 65 }
 66 
 67 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 68 {
 69         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 70         struct sockaddr *sa = addr;
 71         int ret;
 72 
 73         if (ieee80211_sdata_running(sdata))
 74                 return -EBUSY;
 75 
 76         ret = eth_mac_addr(dev, sa);
 77 
 78         if (ret == 0)
 79                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 80 
 81         return ret;
 82 }
 83 
 84 static inline int identical_mac_addr_allowed(int type1, int type2)
 85 {
 86         return type1 == NL80211_IFTYPE_MONITOR ||
 87                 type2 == NL80211_IFTYPE_MONITOR ||
 88                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 89                 (type1 == NL80211_IFTYPE_WDS &&
 90                         (type2 == NL80211_IFTYPE_WDS ||
 91                          type2 == NL80211_IFTYPE_AP)) ||
 92                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 93                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 94                         (type2 == NL80211_IFTYPE_AP ||
 95                          type2 == NL80211_IFTYPE_AP_VLAN));
 96 }
 97 
 98 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 99                                             enum nl80211_iftype iftype)
100 {
101         struct ieee80211_local *local = sdata->local;
102         struct ieee80211_sub_if_data *nsdata;
103         struct net_device *dev = sdata->dev;
104 
105         ASSERT_RTNL();
106 
107         /* we hold the RTNL here so can safely walk the list */
108         list_for_each_entry(nsdata, &local->interfaces, list) {
109                 struct net_device *ndev = nsdata->dev;
110 
111                 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
112                         /*
113                          * Allow only a single IBSS interface to be up at any
114                          * time. This is restricted because beacon distribution
115                          * cannot work properly if both are in the same IBSS.
116                          *
117                          * To remove this restriction we'd have to disallow them
118                          * from setting the same SSID on different IBSS interfaces
119                          * belonging to the same hardware. Then, however, we're
120                          * faced with having to adopt two different TSF timers...
121                          */
122                         if (iftype == NL80211_IFTYPE_ADHOC &&
123                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
124                                 return -EBUSY;
125 
126                         /*
127                          * The remaining checks are only performed for interfaces
128                          * with the same MAC address.
129                          */
130                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
131                                 continue;
132 
133                         /*
134                          * check whether it may have the same address
135                          */
136                         if (!identical_mac_addr_allowed(iftype,
137                                                         nsdata->vif.type))
138                                 return -ENOTUNIQ;
139 
140                         /*
141                          * can only add VLANs to enabled APs
142                          */
143                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
144                             nsdata->vif.type == NL80211_IFTYPE_AP)
145                                 sdata->bss = &nsdata->u.ap;
146                 }
147         }
148 
149         return 0;
150 }
151 
152 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
153                                     const int offset)
154 {
155         struct ieee80211_local *local = sdata->local;
156         u32 flags = sdata->u.mntr_flags;
157 
158 #define ADJUST(_f, _s)  do {                                    \
159         if (flags & MONITOR_FLAG_##_f)                          \
160                 local->fif_##_s += offset;                      \
161         } while (0)
162 
163         ADJUST(FCSFAIL, fcsfail);
164         ADJUST(PLCPFAIL, plcpfail);
165         ADJUST(CONTROL, control);
166         ADJUST(CONTROL, pspoll);
167         ADJUST(OTHER_BSS, other_bss);
168 
169 #undef ADJUST
170 }
171 
172 /*
173  * NOTE: Be very careful when changing this function, it must NOT return
174  * an error on interface type changes that have been pre-checked, so most
175  * checks should be in ieee80211_check_concurrent_iface.
176  */
177 static int ieee80211_do_open(struct net_device *dev, bool coming_up)
178 {
179         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
180         struct ieee80211_local *local = sdata->local;
181         struct sta_info *sta;
182         u32 changed = 0;
183         int res;
184         u32 hw_reconf_flags = 0;
185 
186         switch (sdata->vif.type) {
187         case NL80211_IFTYPE_WDS:
188                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
189                         return -ENOLINK;
190                 break;
191         case NL80211_IFTYPE_AP_VLAN:
192                 if (!sdata->bss)
193                         return -ENOLINK;
194                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
195                 break;
196         case NL80211_IFTYPE_AP:
197                 sdata->bss = &sdata->u.ap;
198                 break;
199         case NL80211_IFTYPE_MESH_POINT:
200         case NL80211_IFTYPE_STATION:
201         case NL80211_IFTYPE_MONITOR:
202         case NL80211_IFTYPE_ADHOC:
203                 /* no special treatment */
204                 break;
205         case NL80211_IFTYPE_UNSPECIFIED:
206         case NUM_NL80211_IFTYPES:
207         case NL80211_IFTYPE_P2P_CLIENT:
208         case NL80211_IFTYPE_P2P_GO:
209                 /* cannot happen */
210                 WARN_ON(1);
211                 break;
212         }
213 
214         if (local->open_count == 0) {
215                 res = drv_start(local);
216                 if (res)
217                         goto err_del_bss;
218                 if (local->ops->napi_poll)
219                         napi_enable(&local->napi);
220                 /* we're brought up, everything changes */
221                 hw_reconf_flags = ~0;
222                 ieee80211_led_radio(local, true);
223                 ieee80211_mod_tpt_led_trig(local,
224                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
225         }
226 
227         /*
228          * Copy the hopefully now-present MAC address to
229          * this interface, if it has the special null one.
230          */
231         if (is_zero_ether_addr(dev->dev_addr)) {
232                 memcpy(dev->dev_addr,
233                        local->hw.wiphy->perm_addr,
234                        ETH_ALEN);
235                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
236 
237                 if (!is_valid_ether_addr(dev->dev_addr)) {
238                         if (!local->open_count)
239                                 drv_stop(local);
240                         return -EADDRNOTAVAIL;
241                 }
242         }
243 
244         switch (sdata->vif.type) {
245         case NL80211_IFTYPE_AP_VLAN:
246                 /* no need to tell driver */
247                 break;
248         case NL80211_IFTYPE_MONITOR:
249                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
250                         local->cooked_mntrs++;
251                         break;
252                 }
253 
254                 /* must be before the call to ieee80211_configure_filter */
255                 local->monitors++;
256                 if (local->monitors == 1) {
257                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
258                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
259                 }
260 
261                 ieee80211_adjust_monitor_flags(sdata, 1);
262                 ieee80211_configure_filter(local);
263 
264                 netif_carrier_on(dev);
265                 break;
266         default:
267                 if (coming_up) {
268                         res = drv_add_interface(local, &sdata->vif);
269                         if (res)
270                                 goto err_stop;
271                 }
272 
273                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
274                         local->fif_pspoll++;
275                         local->fif_probe_req++;
276 
277                         ieee80211_configure_filter(local);
278                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
279                         local->fif_probe_req++;
280                 }
281 
282                 changed |= ieee80211_reset_erp_info(sdata);
283                 ieee80211_bss_info_change_notify(sdata, changed);
284 
285                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
286                         netif_carrier_off(dev);
287                 else
288                         netif_carrier_on(dev);
289         }
290 
291         set_bit(SDATA_STATE_RUNNING, &sdata->state);
292 
293         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
294                 /* Create STA entry for the WDS peer */
295                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
296                                      GFP_KERNEL);
297                 if (!sta) {
298                         res = -ENOMEM;
299                         goto err_del_interface;
300                 }
301 
302                 /* no locking required since STA is not live yet */
303                 sta->flags |= WLAN_STA_AUTHORIZED;
304 
305                 res = sta_info_insert(sta);
306                 if (res) {
307                         /* STA has been freed */
308                         goto err_del_interface;
309                 }
310 
311                 rate_control_rate_init(sta);
312         }
313 
314         /*
315          * set_multicast_list will be invoked by the networking core
316          * which will check whether any increments here were done in
317          * error and sync them down to the hardware as filter flags.
318          */
319         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
320                 atomic_inc(&local->iff_allmultis);
321 
322         if (sdata->flags & IEEE80211_SDATA_PROMISC)
323                 atomic_inc(&local->iff_promiscs);
324 
325         mutex_lock(&local->mtx);
326         hw_reconf_flags |= __ieee80211_recalc_idle(local);
327         mutex_unlock(&local->mtx);
328 
329         if (coming_up)
330                 local->open_count++;
331 
332         if (hw_reconf_flags) {
333                 ieee80211_hw_config(local, hw_reconf_flags);
334                 /*
335                  * set default queue parameters so drivers don't
336                  * need to initialise the hardware if the hardware
337                  * doesn't start up with sane defaults
338                  */
339                 ieee80211_set_wmm_default(sdata);
340         }
341 
342         ieee80211_recalc_ps(local, -1);
343 
344         netif_tx_start_all_queues(dev);
345 
346         return 0;
347  err_del_interface:
348         drv_remove_interface(local, &sdata->vif);
349  err_stop:
350         if (!local->open_count)
351                 drv_stop(local);
352  err_del_bss:
353         sdata->bss = NULL;
354         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
355                 list_del(&sdata->u.vlan.list);
356         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
357         return res;
358 }
359 
360 static int ieee80211_open(struct net_device *dev)
361 {
362         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
363         int err;
364 
365         /* fail early if user set an invalid address */
366         if (!is_zero_ether_addr(dev->dev_addr) &&
367             !is_valid_ether_addr(dev->dev_addr))
368                 return -EADDRNOTAVAIL;
369 
370         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
371         if (err)
372                 return err;
373 
374         return ieee80211_do_open(dev, true);
375 }
376 
377 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
378                               bool going_down)
379 {
380         struct ieee80211_local *local = sdata->local;
381         unsigned long flags;
382         struct sk_buff *skb, *tmp;
383         u32 hw_reconf_flags = 0;
384         int i;
385         enum nl80211_channel_type orig_ct;
386 
387         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
388 
389         if (local->scan_sdata == sdata)
390                 ieee80211_scan_cancel(local);
391 
392         /*
393          * Stop TX on this interface first.
394          */
395         netif_tx_stop_all_queues(sdata->dev);
396 
397         /*
398          * Purge work for this interface.
399          */
400         ieee80211_work_purge(sdata);
401 
402         /*
403          * Remove all stations associated with this interface.
404          *
405          * This must be done before calling ops->remove_interface()
406          * because otherwise we can later invoke ops->sta_notify()
407          * whenever the STAs are removed, and that invalidates driver
408          * assumptions about always getting a vif pointer that is valid
409          * (because if we remove a STA after ops->remove_interface()
410          * the driver will have removed the vif info already!)
411          *
412          * This is relevant only in AP, WDS and mesh modes, since in
413          * all other modes we've already removed all stations when
414          * disconnecting etc.
415          */
416         sta_info_flush(local, sdata);
417 
418         /*
419          * Don't count this interface for promisc/allmulti while it
420          * is down. dev_mc_unsync() will invoke set_multicast_list
421          * on the master interface which will sync these down to the
422          * hardware as filter flags.
423          */
424         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
425                 atomic_dec(&local->iff_allmultis);
426 
427         if (sdata->flags & IEEE80211_SDATA_PROMISC)
428                 atomic_dec(&local->iff_promiscs);
429 
430         if (sdata->vif.type == NL80211_IFTYPE_AP) {
431                 local->fif_pspoll--;
432                 local->fif_probe_req--;
433         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
434                 local->fif_probe_req--;
435         }
436 
437         netif_addr_lock_bh(sdata->dev);
438         spin_lock_bh(&local->filter_lock);
439         __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
440                          sdata->dev->addr_len);
441         spin_unlock_bh(&local->filter_lock);
442         netif_addr_unlock_bh(sdata->dev);
443 
444         ieee80211_configure_filter(local);
445 
446         del_timer_sync(&local->dynamic_ps_timer);
447         cancel_work_sync(&local->dynamic_ps_enable_work);
448 
449         /* APs need special treatment */
450         if (sdata->vif.type == NL80211_IFTYPE_AP) {
451                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
452                 struct beacon_data *old_beacon =
453                         rtnl_dereference(sdata->u.ap.beacon);
454 
455                 /* sdata_running will return false, so this will disable */
456                 ieee80211_bss_info_change_notify(sdata,
457                                                  BSS_CHANGED_BEACON_ENABLED);
458 
459                 /* remove beacon */
460                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
461                 synchronize_rcu();
462                 kfree(old_beacon);
463 
464                 /* free all potentially still buffered bcast frames */
465                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
466                         local->total_ps_buffered--;
467                         dev_kfree_skb(skb);
468                 }
469 
470                 /* down all dependent devices, that is VLANs */
471                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
472                                          u.vlan.list)
473                         dev_close(vlan->dev);
474                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
475         }
476 
477         if (going_down)
478                 local->open_count--;
479 
480         switch (sdata->vif.type) {
481         case NL80211_IFTYPE_AP_VLAN:
482                 list_del(&sdata->u.vlan.list);
483                 /* no need to tell driver */
484                 break;
485         case NL80211_IFTYPE_MONITOR:
486                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
487                         local->cooked_mntrs--;
488                         break;
489                 }
490 
491                 local->monitors--;
492                 if (local->monitors == 0) {
493                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
494                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
495                 }
496 
497                 ieee80211_adjust_monitor_flags(sdata, -1);
498                 ieee80211_configure_filter(local);
499                 break;
500         default:
501                 mutex_lock(&local->mtx);
502                 if (local->hw_roc_dev == sdata->dev &&
503                     local->hw_roc_channel) {
504                         /* ignore return value since this is racy */
505                         drv_cancel_remain_on_channel(local);
506                         ieee80211_queue_work(&local->hw, &local->hw_roc_done);
507                 }
508                 mutex_unlock(&local->mtx);
509 
510                 flush_work(&local->hw_roc_start);
511                 flush_work(&local->hw_roc_done);
512 
513                 flush_work(&sdata->work);
514                 /*
515                  * When we get here, the interface is marked down.
516                  * Call synchronize_rcu() to wait for the RX path
517                  * should it be using the interface and enqueuing
518                  * frames at this very time on another CPU.
519                  */
520                 synchronize_rcu();
521                 skb_queue_purge(&sdata->skb_queue);
522 
523                 /*
524                  * Disable beaconing here for mesh only, AP and IBSS
525                  * are already taken care of.
526                  */
527                 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
528                         ieee80211_bss_info_change_notify(sdata,
529                                 BSS_CHANGED_BEACON_ENABLED);
530 
531                 /*
532                  * Free all remaining keys, there shouldn't be any,
533                  * except maybe group keys in AP more or WDS?
534                  */
535                 ieee80211_free_keys(sdata);
536 
537                 if (going_down)
538                         drv_remove_interface(local, &sdata->vif);
539         }
540 
541         sdata->bss = NULL;
542 
543         mutex_lock(&local->mtx);
544         hw_reconf_flags |= __ieee80211_recalc_idle(local);
545         mutex_unlock(&local->mtx);
546 
547         ieee80211_recalc_ps(local, -1);
548 
549         if (local->open_count == 0) {
550                 if (local->ops->napi_poll)
551                         napi_disable(&local->napi);
552                 ieee80211_clear_tx_pending(local);
553                 ieee80211_stop_device(local);
554 
555                 /* no reconfiguring after stop! */
556                 hw_reconf_flags = 0;
557         }
558 
559         /* Re-calculate channel-type, in case there are multiple vifs
560          * on different channel types.
561          */
562         orig_ct = local->_oper_channel_type;
563         ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
564 
565         /* do after stop to avoid reconfiguring when we stop anyway */
566         if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
567                 ieee80211_hw_config(local, hw_reconf_flags);
568 
569         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
570         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
571                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
572                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
573                         if (info->control.vif == &sdata->vif) {
574                                 __skb_unlink(skb, &local->pending[i]);
575                                 dev_kfree_skb_irq(skb);
576                         }
577                 }
578         }
579         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
580 }
581 
582 static int ieee80211_stop(struct net_device *dev)
583 {
584         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
585 
586         ieee80211_do_stop(sdata, true);
587 
588         return 0;
589 }
590 
591 static void ieee80211_set_multicast_list(struct net_device *dev)
592 {
593         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
594         struct ieee80211_local *local = sdata->local;
595         int allmulti, promisc, sdata_allmulti, sdata_promisc;
596 
597         allmulti = !!(dev->flags & IFF_ALLMULTI);
598         promisc = !!(dev->flags & IFF_PROMISC);
599         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
600         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
601 
602         if (allmulti != sdata_allmulti) {
603                 if (dev->flags & IFF_ALLMULTI)
604                         atomic_inc(&local->iff_allmultis);
605                 else
606                         atomic_dec(&local->iff_allmultis);
607                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
608         }
609 
610         if (promisc != sdata_promisc) {
611                 if (dev->flags & IFF_PROMISC)
612                         atomic_inc(&local->iff_promiscs);
613                 else
614                         atomic_dec(&local->iff_promiscs);
615                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
616         }
617         spin_lock_bh(&local->filter_lock);
618         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
619         spin_unlock_bh(&local->filter_lock);
620         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
621 }
622 
623 /*
624  * Called when the netdev is removed or, by the code below, before
625  * the interface type changes.
626  */
627 static void ieee80211_teardown_sdata(struct net_device *dev)
628 {
629         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
630         struct ieee80211_local *local = sdata->local;
631         int flushed;
632         int i;
633 
634         /* free extra data */
635         ieee80211_free_keys(sdata);
636 
637         ieee80211_debugfs_remove_netdev(sdata);
638 
639         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
640                 __skb_queue_purge(&sdata->fragments[i].skb_list);
641         sdata->fragment_next = 0;
642 
643         if (ieee80211_vif_is_mesh(&sdata->vif))
644                 mesh_rmc_free(sdata);
645 
646         flushed = sta_info_flush(local, sdata);
647         WARN_ON(flushed);
648 }
649 
650 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
651                                          struct sk_buff *skb)
652 {
653         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
654 }
655 
656 static const struct net_device_ops ieee80211_dataif_ops = {
657         .ndo_open               = ieee80211_open,
658         .ndo_stop               = ieee80211_stop,
659         .ndo_uninit             = ieee80211_teardown_sdata,
660         .ndo_start_xmit         = ieee80211_subif_start_xmit,
661         .ndo_set_multicast_list = ieee80211_set_multicast_list,
662         .ndo_change_mtu         = ieee80211_change_mtu,
663         .ndo_set_mac_address    = ieee80211_change_mac,
664         .ndo_select_queue       = ieee80211_netdev_select_queue,
665 };
666 
667 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
668                                           struct sk_buff *skb)
669 {
670         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
671         struct ieee80211_local *local = sdata->local;
672         struct ieee80211_hdr *hdr;
673         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
674         u8 *p;
675 
676         if (local->hw.queues < 4)
677                 return 0;
678 
679         if (skb->len < 4 ||
680             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
681                 return 0; /* doesn't matter, frame will be dropped */
682 
683         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
684 
685         if (!ieee80211_is_data(hdr->frame_control)) {
686                 skb->priority = 7;
687                 return ieee802_1d_to_ac[skb->priority];
688         }
689         if (!ieee80211_is_data_qos(hdr->frame_control)) {
690                 skb->priority = 0;
691                 return ieee802_1d_to_ac[skb->priority];
692         }
693 
694         p = ieee80211_get_qos_ctl(hdr);
695         skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
696 
697         return ieee80211_downgrade_queue(local, skb);
698 }
699 
700 static const struct net_device_ops ieee80211_monitorif_ops = {
701         .ndo_open               = ieee80211_open,
702         .ndo_stop               = ieee80211_stop,
703         .ndo_uninit             = ieee80211_teardown_sdata,
704         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
705         .ndo_set_multicast_list = ieee80211_set_multicast_list,
706         .ndo_change_mtu         = ieee80211_change_mtu,
707         .ndo_set_mac_address    = eth_mac_addr,
708         .ndo_select_queue       = ieee80211_monitor_select_queue,
709 };
710 
711 static void ieee80211_if_setup(struct net_device *dev)
712 {
713         ether_setup(dev);
714         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
715         dev->netdev_ops = &ieee80211_dataif_ops;
716         dev->destructor = free_netdev;
717 }
718 
719 static void ieee80211_iface_work(struct work_struct *work)
720 {
721         struct ieee80211_sub_if_data *sdata =
722                 container_of(work, struct ieee80211_sub_if_data, work);
723         struct ieee80211_local *local = sdata->local;
724         struct sk_buff *skb;
725         struct sta_info *sta;
726         struct ieee80211_ra_tid *ra_tid;
727 
728         if (!ieee80211_sdata_running(sdata))
729                 return;
730 
731         if (local->scanning)
732                 return;
733 
734         /*
735          * ieee80211_queue_work() should have picked up most cases,
736          * here we'll pick the rest.
737          */
738         if (WARN(local->suspended,
739                  "interface work scheduled while going to suspend\n"))
740                 return;
741 
742         /* first process frames */
743         while ((skb = skb_dequeue(&sdata->skb_queue))) {
744                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
745 
746                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
747                         ra_tid = (void *)&skb->cb;
748                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
749                                                  ra_tid->tid);
750                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
751                         ra_tid = (void *)&skb->cb;
752                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
753                                                 ra_tid->tid);
754                 } else if (ieee80211_is_action(mgmt->frame_control) &&
755                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
756                         int len = skb->len;
757 
758                         mutex_lock(&local->sta_mtx);
759                         sta = sta_info_get_bss(sdata, mgmt->sa);
760                         if (sta) {
761                                 switch (mgmt->u.action.u.addba_req.action_code) {
762                                 case WLAN_ACTION_ADDBA_REQ:
763                                         ieee80211_process_addba_request(
764                                                         local, sta, mgmt, len);
765                                         break;
766                                 case WLAN_ACTION_ADDBA_RESP:
767                                         ieee80211_process_addba_resp(local, sta,
768                                                                      mgmt, len);
769                                         break;
770                                 case WLAN_ACTION_DELBA:
771                                         ieee80211_process_delba(sdata, sta,
772                                                                 mgmt, len);
773                                         break;
774                                 default:
775                                         WARN_ON(1);
776                                         break;
777                                 }
778                         }
779                         mutex_unlock(&local->sta_mtx);
780                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
781                         struct ieee80211_hdr *hdr = (void *)mgmt;
782                         /*
783                          * So the frame isn't mgmt, but frame_control
784                          * is at the right place anyway, of course, so
785                          * the if statement is correct.
786                          *
787                          * Warn if we have other data frame types here,
788                          * they must not get here.
789                          */
790                         WARN_ON(hdr->frame_control &
791                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
792                         WARN_ON(!(hdr->seq_ctrl &
793                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
794                         /*
795                          * This was a fragment of a frame, received while
796                          * a block-ack session was active. That cannot be
797                          * right, so terminate the session.
798                          */
799                         mutex_lock(&local->sta_mtx);
800                         sta = sta_info_get_bss(sdata, mgmt->sa);
801                         if (sta) {
802                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
803                                                 IEEE80211_QOS_CTL_TID_MASK;
804 
805                                 __ieee80211_stop_rx_ba_session(
806                                         sta, tid, WLAN_BACK_RECIPIENT,
807                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
808                                         true);
809                         }
810                         mutex_unlock(&local->sta_mtx);
811                 } else switch (sdata->vif.type) {
812                 case NL80211_IFTYPE_STATION:
813                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
814                         break;
815                 case NL80211_IFTYPE_ADHOC:
816                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
817                         break;
818                 case NL80211_IFTYPE_MESH_POINT:
819                         if (!ieee80211_vif_is_mesh(&sdata->vif))
820                                 break;
821                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
822                         break;
823                 default:
824                         WARN(1, "frame for unexpected interface type");
825                         break;
826                 }
827 
828                 kfree_skb(skb);
829         }
830 
831         /* then other type-dependent work */
832         switch (sdata->vif.type) {
833         case NL80211_IFTYPE_STATION:
834                 ieee80211_sta_work(sdata);
835                 break;
836         case NL80211_IFTYPE_ADHOC:
837                 ieee80211_ibss_work(sdata);
838                 break;
839         case NL80211_IFTYPE_MESH_POINT:
840                 if (!ieee80211_vif_is_mesh(&sdata->vif))
841                         break;
842                 ieee80211_mesh_work(sdata);
843                 break;
844         default:
845                 break;
846         }
847 }
848 
849 
850 /*
851  * Helper function to initialise an interface to a specific type.
852  */
853 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
854                                   enum nl80211_iftype type)
855 {
856         /* clear type-dependent union */
857         memset(&sdata->u, 0, sizeof(sdata->u));
858 
859         /* and set some type-dependent values */
860         sdata->vif.type = type;
861         sdata->vif.p2p = false;
862         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
863         sdata->wdev.iftype = type;
864 
865         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
866         sdata->control_port_no_encrypt = false;
867 
868         /* only monitor differs */
869         sdata->dev->type = ARPHRD_ETHER;
870 
871         skb_queue_head_init(&sdata->skb_queue);
872         INIT_WORK(&sdata->work, ieee80211_iface_work);
873 
874         switch (type) {
875         case NL80211_IFTYPE_P2P_GO:
876                 type = NL80211_IFTYPE_AP;
877                 sdata->vif.type = type;
878                 sdata->vif.p2p = true;
879                 /* fall through */
880         case NL80211_IFTYPE_AP:
881                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
882                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
883                 break;
884         case NL80211_IFTYPE_P2P_CLIENT:
885                 type = NL80211_IFTYPE_STATION;
886                 sdata->vif.type = type;
887                 sdata->vif.p2p = true;
888                 /* fall through */
889         case NL80211_IFTYPE_STATION:
890                 ieee80211_sta_setup_sdata(sdata);
891                 break;
892         case NL80211_IFTYPE_ADHOC:
893                 ieee80211_ibss_setup_sdata(sdata);
894                 break;
895         case NL80211_IFTYPE_MESH_POINT:
896                 if (ieee80211_vif_is_mesh(&sdata->vif))
897                         ieee80211_mesh_init_sdata(sdata);
898                 break;
899         case NL80211_IFTYPE_MONITOR:
900                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
901                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
902                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
903                                       MONITOR_FLAG_OTHER_BSS;
904                 break;
905         case NL80211_IFTYPE_WDS:
906         case NL80211_IFTYPE_AP_VLAN:
907                 break;
908         case NL80211_IFTYPE_UNSPECIFIED:
909         case NUM_NL80211_IFTYPES:
910                 BUG();
911                 break;
912         }
913 
914         ieee80211_debugfs_add_netdev(sdata);
915 }
916 
917 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
918                                            enum nl80211_iftype type)
919 {
920         struct ieee80211_local *local = sdata->local;
921         int ret, err;
922         enum nl80211_iftype internal_type = type;
923         bool p2p = false;
924 
925         ASSERT_RTNL();
926 
927         if (!local->ops->change_interface)
928                 return -EBUSY;
929 
930         switch (sdata->vif.type) {
931         case NL80211_IFTYPE_AP:
932         case NL80211_IFTYPE_STATION:
933         case NL80211_IFTYPE_ADHOC:
934                 /*
935                  * Could maybe also all others here?
936                  * Just not sure how that interacts
937                  * with the RX/config path e.g. for
938                  * mesh.
939                  */
940                 break;
941         default:
942                 return -EBUSY;
943         }
944 
945         switch (type) {
946         case NL80211_IFTYPE_AP:
947         case NL80211_IFTYPE_STATION:
948         case NL80211_IFTYPE_ADHOC:
949                 /*
950                  * Could probably support everything
951                  * but WDS here (WDS do_open can fail
952                  * under memory pressure, which this
953                  * code isn't prepared to handle).
954                  */
955                 break;
956         case NL80211_IFTYPE_P2P_CLIENT:
957                 p2p = true;
958                 internal_type = NL80211_IFTYPE_STATION;
959                 break;
960         case NL80211_IFTYPE_P2P_GO:
961                 p2p = true;
962                 internal_type = NL80211_IFTYPE_AP;
963                 break;
964         default:
965                 return -EBUSY;
966         }
967 
968         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
969         if (ret)
970                 return ret;
971 
972         ieee80211_do_stop(sdata, false);
973 
974         ieee80211_teardown_sdata(sdata->dev);
975 
976         ret = drv_change_interface(local, sdata, internal_type, p2p);
977         if (ret)
978                 type = sdata->vif.type;
979 
980         ieee80211_setup_sdata(sdata, type);
981 
982         err = ieee80211_do_open(sdata->dev, false);
983         WARN(err, "type change: do_open returned %d", err);
984 
985         return ret;
986 }
987 
988 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
989                              enum nl80211_iftype type)
990 {
991         int ret;
992 
993         ASSERT_RTNL();
994 
995         if (type == ieee80211_vif_type_p2p(&sdata->vif))
996                 return 0;
997 
998         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
999         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
1000             type == NL80211_IFTYPE_ADHOC)
1001                 return -EOPNOTSUPP;
1002 
1003         if (ieee80211_sdata_running(sdata)) {
1004                 ret = ieee80211_runtime_change_iftype(sdata, type);
1005                 if (ret)
1006                         return ret;
1007         } else {
1008                 /* Purge and reset type-dependent state. */
1009                 ieee80211_teardown_sdata(sdata->dev);
1010                 ieee80211_setup_sdata(sdata, type);
1011         }
1012 
1013         /* reset some values that shouldn't be kept across type changes */
1014         sdata->vif.bss_conf.basic_rates =
1015                 ieee80211_mandatory_rates(sdata->local,
1016                         sdata->local->hw.conf.channel->band);
1017         sdata->drop_unencrypted = 0;
1018         if (type == NL80211_IFTYPE_STATION)
1019                 sdata->u.mgd.use_4addr = false;
1020 
1021         return 0;
1022 }
1023 
1024 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1025                                        struct net_device *dev,
1026                                        enum nl80211_iftype type)
1027 {
1028         struct ieee80211_sub_if_data *sdata;
1029         u64 mask, start, addr, val, inc;
1030         u8 *m;
1031         u8 tmp_addr[ETH_ALEN];
1032         int i;
1033 
1034         /* default ... something at least */
1035         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1036 
1037         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1038             local->hw.wiphy->n_addresses <= 1)
1039                 return;
1040 
1041 
1042         mutex_lock(&local->iflist_mtx);
1043 
1044         switch (type) {
1045         case NL80211_IFTYPE_MONITOR:
1046                 /* doesn't matter */
1047                 break;
1048         case NL80211_IFTYPE_WDS:
1049         case NL80211_IFTYPE_AP_VLAN:
1050                 /* match up with an AP interface */
1051                 list_for_each_entry(sdata, &local->interfaces, list) {
1052                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1053                                 continue;
1054                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1055                         break;
1056                 }
1057                 /* keep default if no AP interface present */
1058                 break;
1059         default:
1060                 /* assign a new address if possible -- try n_addresses first */
1061                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1062                         bool used = false;
1063 
1064                         list_for_each_entry(sdata, &local->interfaces, list) {
1065                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1066                                            sdata->vif.addr, ETH_ALEN) == 0) {
1067                                         used = true;
1068                                         break;
1069                                 }
1070                         }
1071 
1072                         if (!used) {
1073                                 memcpy(dev->perm_addr,
1074                                        local->hw.wiphy->addresses[i].addr,
1075                                        ETH_ALEN);
1076                                 break;
1077                         }
1078                 }
1079 
1080                 /* try mask if available */
1081                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1082                         break;
1083 
1084                 m = local->hw.wiphy->addr_mask;
1085                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1086                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1087                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1088 
1089                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1090                         /* not a contiguous mask ... not handled now! */
1091                         printk(KERN_DEBUG "not contiguous\n");
1092                         break;
1093                 }
1094 
1095                 m = local->hw.wiphy->perm_addr;
1096                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1097                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1098                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1099 
1100                 inc = 1ULL<<__ffs64(mask);
1101                 val = (start & mask);
1102                 addr = (start & ~mask) | (val & mask);
1103                 do {
1104                         bool used = false;
1105 
1106                         tmp_addr[5] = addr >> 0*8;
1107                         tmp_addr[4] = addr >> 1*8;
1108                         tmp_addr[3] = addr >> 2*8;
1109                         tmp_addr[2] = addr >> 3*8;
1110                         tmp_addr[1] = addr >> 4*8;
1111                         tmp_addr[0] = addr >> 5*8;
1112 
1113                         val += inc;
1114 
1115                         list_for_each_entry(sdata, &local->interfaces, list) {
1116                                 if (memcmp(tmp_addr, sdata->vif.addr,
1117                                                         ETH_ALEN) == 0) {
1118                                         used = true;
1119                                         break;
1120                                 }
1121                         }
1122 
1123                         if (!used) {
1124                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1125                                 break;
1126                         }
1127                         addr = (start & ~mask) | (val & mask);
1128                 } while (addr != start);
1129 
1130                 break;
1131         }
1132 
1133         mutex_unlock(&local->iflist_mtx);
1134 }
1135 
1136 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1137                      struct net_device **new_dev, enum nl80211_iftype type,
1138                      struct vif_params *params)
1139 {
1140         struct net_device *ndev;
1141         struct ieee80211_sub_if_data *sdata = NULL;
1142         int ret, i;
1143 
1144         ASSERT_RTNL();
1145 
1146         ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size,
1147                                name, ieee80211_if_setup, local->hw.queues);
1148         if (!ndev)
1149                 return -ENOMEM;
1150         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1151 
1152         ndev->needed_headroom = local->tx_headroom +
1153                                 4*6 /* four MAC addresses */
1154                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1155                                 + 6 /* mesh */
1156                                 + 8 /* rfc1042/bridge tunnel */
1157                                 - ETH_HLEN /* ethernet hard_header_len */
1158                                 + IEEE80211_ENCRYPT_HEADROOM;
1159         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1160 
1161         ret = dev_alloc_name(ndev, ndev->name);
1162         if (ret < 0)
1163                 goto fail;
1164 
1165         ieee80211_assign_perm_addr(local, ndev, type);
1166         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1167         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1168 
1169         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1170         sdata = netdev_priv(ndev);
1171         ndev->ieee80211_ptr = &sdata->wdev;
1172         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1173         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1174 
1175         /* initialise type-independent data */
1176         sdata->wdev.wiphy = local->hw.wiphy;
1177         sdata->local = local;
1178         sdata->dev = ndev;
1179 #ifdef CONFIG_INET
1180         sdata->arp_filter_state = true;
1181 #endif
1182 
1183         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1184                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1185 
1186         INIT_LIST_HEAD(&sdata->key_list);
1187 
1188         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1189                 struct ieee80211_supported_band *sband;
1190                 sband = local->hw.wiphy->bands[i];
1191                 sdata->rc_rateidx_mask[i] =
1192                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1193         }
1194 
1195         /* setup type-dependent data */
1196         ieee80211_setup_sdata(sdata, type);
1197 
1198         if (params) {
1199                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1200                 if (type == NL80211_IFTYPE_STATION)
1201                         sdata->u.mgd.use_4addr = params->use_4addr;
1202         }
1203 
1204         ret = register_netdevice(ndev);
1205         if (ret)
1206                 goto fail;
1207 
1208         mutex_lock(&local->iflist_mtx);
1209         list_add_tail_rcu(&sdata->list, &local->interfaces);
1210         mutex_unlock(&local->iflist_mtx);
1211 
1212         if (new_dev)
1213                 *new_dev = ndev;
1214 
1215         return 0;
1216 
1217  fail:
1218         free_netdev(ndev);
1219         return ret;
1220 }
1221 
1222 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1223 {
1224         ASSERT_RTNL();
1225 
1226         mutex_lock(&sdata->local->iflist_mtx);
1227         list_del_rcu(&sdata->list);
1228         mutex_unlock(&sdata->local->iflist_mtx);
1229 
1230         synchronize_rcu();
1231         unregister_netdevice(sdata->dev);
1232 }
1233 
1234 /*
1235  * Remove all interfaces, may only be called at hardware unregistration
1236  * time because it doesn't do RCU-safe list removals.
1237  */
1238 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1239 {
1240         struct ieee80211_sub_if_data *sdata, *tmp;
1241         LIST_HEAD(unreg_list);
1242 
1243         ASSERT_RTNL();
1244 
1245         /*
1246          * Close all AP_VLAN interfaces first, as otherwise they
1247          * might be closed while the AP interface they belong to
1248          * is closed, causing unregister_netdevice_many() to crash.
1249          */
1250         list_for_each_entry(sdata, &local->interfaces, list)
1251                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1252                         dev_close(sdata->dev);
1253 
1254         mutex_lock(&local->iflist_mtx);
1255         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1256                 list_del(&sdata->list);
1257 
1258                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1259         }
1260         mutex_unlock(&local->iflist_mtx);
1261         unregister_netdevice_many(&unreg_list);
1262         list_del(&unreg_list);
1263 }
1264 
1265 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1266                               const char *reason)
1267 {
1268         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1269                 return 0;
1270 
1271 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1272         wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1273 #endif
1274 
1275         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1276         return IEEE80211_CONF_CHANGE_IDLE;
1277 }
1278 
1279 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1280 {
1281         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1282                 return 0;
1283 
1284 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1285         wiphy_debug(local->hw.wiphy, "device now idle\n");
1286 #endif
1287 
1288         drv_flush(local, false);
1289 
1290         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1291         return IEEE80211_CONF_CHANGE_IDLE;
1292 }
1293 
1294 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1295 {
1296         struct ieee80211_sub_if_data *sdata;
1297         int count = 0;
1298         bool working = false, scanning = false, hw_roc = false;
1299         struct ieee80211_work *wk;
1300         unsigned int led_trig_start = 0, led_trig_stop = 0;
1301 
1302 #ifdef CONFIG_PROVE_LOCKING
1303         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1304                 !lockdep_is_held(&local->iflist_mtx));
1305 #endif
1306         lockdep_assert_held(&local->mtx);
1307 
1308         list_for_each_entry(sdata, &local->interfaces, list) {
1309                 if (!ieee80211_sdata_running(sdata)) {
1310                         sdata->vif.bss_conf.idle = true;
1311                         continue;
1312                 }
1313 
1314                 sdata->old_idle = sdata->vif.bss_conf.idle;
1315 
1316                 /* do not count disabled managed interfaces */
1317                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1318                     !sdata->u.mgd.associated) {
1319                         sdata->vif.bss_conf.idle = true;
1320                         continue;
1321                 }
1322                 /* do not count unused IBSS interfaces */
1323                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1324                     !sdata->u.ibss.ssid_len) {
1325                         sdata->vif.bss_conf.idle = true;
1326                         continue;
1327                 }
1328                 /* count everything else */
1329                 count++;
1330         }
1331 
1332         list_for_each_entry(wk, &local->work_list, list) {
1333                 working = true;
1334                 wk->sdata->vif.bss_conf.idle = false;
1335         }
1336 
1337         if (local->scan_sdata) {
1338                 scanning = true;
1339                 local->scan_sdata->vif.bss_conf.idle = false;
1340         }
1341 
1342         if (local->hw_roc_channel)
1343                 hw_roc = true;
1344 
1345         list_for_each_entry(sdata, &local->interfaces, list) {
1346                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1347                         continue;
1348                 if (!ieee80211_sdata_running(sdata))
1349                         continue;
1350                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1351         }
1352 
1353         if (working || scanning || hw_roc)
1354                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1355         else
1356                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1357 
1358         if (count)
1359                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1360         else
1361                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1362 
1363         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
1364 
1365         if (hw_roc)
1366                 return ieee80211_idle_off(local, "hw remain-on-channel");
1367         if (working)
1368                 return ieee80211_idle_off(local, "working");
1369         if (scanning)
1370                 return ieee80211_idle_off(local, "scanning");
1371         if (!count)
1372                 return ieee80211_idle_on(local);
1373         else
1374                 return ieee80211_idle_off(local, "in use");
1375 
1376         return 0;
1377 }
1378 
1379 void ieee80211_recalc_idle(struct ieee80211_local *local)
1380 {
1381         u32 chg;
1382 
1383         mutex_lock(&local->iflist_mtx);
1384         chg = __ieee80211_recalc_idle(local);
1385         mutex_unlock(&local->iflist_mtx);
1386         if (chg)
1387                 ieee80211_hw_config(local, chg);
1388 }
1389 
1390 static int netdev_notify(struct notifier_block *nb,
1391                          unsigned long state,
1392                          void *ndev)
1393 {
1394         struct net_device *dev = ndev;
1395         struct ieee80211_sub_if_data *sdata;
1396 
1397         if (state != NETDEV_CHANGENAME)
1398                 return 0;
1399 
1400         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1401                 return 0;
1402 
1403         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1404                 return 0;
1405 
1406         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1407 
1408         memcpy(sdata->name, dev->name, IFNAMSIZ);
1409 
1410         ieee80211_debugfs_rename_netdev(sdata);
1411         return 0;
1412 }
1413 
1414 static struct notifier_block mac80211_netdev_notifier = {
1415         .notifier_call = netdev_notify,
1416 };
1417 
1418 int ieee80211_iface_init(void)
1419 {
1420         return register_netdevice_notifier(&mac80211_netdev_notifier);
1421 }
1422 
1423 void ieee80211_iface_exit(void)
1424 {
1425         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1426 }
1427 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp