mac80211: don't try to do anything on unchanged genIE
[linux-2.6] / net / mac80211 / main.c
1 /*
2  * Copyright 2002-2005, Instant802 Networks, Inc.
3  * Copyright 2005-2006, Devicescape Software, Inc.
4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10
11 #include <net/mac80211.h>
12 #include <net/ieee80211_radiotap.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/netdevice.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/if_arp.h>
21 #include <linux/wireless.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/bitmap.h>
24 #include <linux/pm_qos_params.h>
25 #include <net/net_namespace.h>
26 #include <net/cfg80211.h>
27
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
30 #include "rate.h"
31 #include "mesh.h"
32 #include "wep.h"
33 #include "wme.h"
34 #include "aes_ccm.h"
35 #include "led.h"
36 #include "cfg.h"
37 #include "debugfs.h"
38 #include "debugfs_netdev.h"
39
40 /*
41  * For seeing transmitted packets on monitor interfaces
42  * we have a radiotap header too.
43  */
44 struct ieee80211_tx_status_rtap_hdr {
45         struct ieee80211_radiotap_header hdr;
46         u8 rate;
47         u8 padding_for_rate;
48         __le16 tx_flags;
49         u8 data_retries;
50 } __attribute__ ((packed));
51
52
53 /* must be called under mdev tx lock */
54 void ieee80211_configure_filter(struct ieee80211_local *local)
55 {
56         unsigned int changed_flags;
57         unsigned int new_flags = 0;
58
59         if (atomic_read(&local->iff_promiscs))
60                 new_flags |= FIF_PROMISC_IN_BSS;
61
62         if (atomic_read(&local->iff_allmultis))
63                 new_flags |= FIF_ALLMULTI;
64
65         if (local->monitors)
66                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
67
68         if (local->fif_fcsfail)
69                 new_flags |= FIF_FCSFAIL;
70
71         if (local->fif_plcpfail)
72                 new_flags |= FIF_PLCPFAIL;
73
74         if (local->fif_control)
75                 new_flags |= FIF_CONTROL;
76
77         if (local->fif_other_bss)
78                 new_flags |= FIF_OTHER_BSS;
79
80         changed_flags = local->filter_flags ^ new_flags;
81
82         /* be a bit nasty */
83         new_flags |= (1<<31);
84
85         drv_configure_filter(local, changed_flags, &new_flags,
86                              local->mdev->mc_count,
87                              local->mdev->mc_list);
88
89         WARN_ON(new_flags & (1<<31));
90
91         local->filter_flags = new_flags & ~(1<<31);
92 }
93
94 /* master interface */
95
96 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
97 {
98         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
99         return ETH_ALEN;
100 }
101
102 static const struct header_ops ieee80211_header_ops = {
103         .create         = eth_header,
104         .parse          = header_parse_80211,
105         .rebuild        = eth_rebuild_header,
106         .cache          = eth_header_cache,
107         .cache_update   = eth_header_cache_update,
108 };
109
110 static int ieee80211_master_open(struct net_device *dev)
111 {
112         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
113         struct ieee80211_local *local = mpriv->local;
114         struct ieee80211_sub_if_data *sdata;
115         int res = -EOPNOTSUPP;
116
117         /* we hold the RTNL here so can safely walk the list */
118         list_for_each_entry(sdata, &local->interfaces, list) {
119                 if (netif_running(sdata->dev)) {
120                         res = 0;
121                         break;
122                 }
123         }
124
125         if (res)
126                 return res;
127
128         netif_tx_start_all_queues(local->mdev);
129
130         return 0;
131 }
132
133 static int ieee80211_master_stop(struct net_device *dev)
134 {
135         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
136         struct ieee80211_local *local = mpriv->local;
137         struct ieee80211_sub_if_data *sdata;
138
139         /* we hold the RTNL here so can safely walk the list */
140         list_for_each_entry(sdata, &local->interfaces, list)
141                 if (netif_running(sdata->dev))
142                         dev_close(sdata->dev);
143
144         return 0;
145 }
146
147 static void ieee80211_master_set_multicast_list(struct net_device *dev)
148 {
149         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
150         struct ieee80211_local *local = mpriv->local;
151
152         ieee80211_configure_filter(local);
153 }
154
155 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
156 {
157         struct ieee80211_channel *chan, *scan_chan;
158         int ret = 0;
159         int power;
160         enum nl80211_channel_type channel_type;
161
162         might_sleep();
163
164         scan_chan = local->scan_channel;
165
166         if (scan_chan) {
167                 chan = scan_chan;
168                 channel_type = NL80211_CHAN_NO_HT;
169         } else {
170                 chan = local->oper_channel;
171                 channel_type = local->oper_channel_type;
172         }
173
174         if (chan != local->hw.conf.channel ||
175             channel_type != local->hw.conf.channel_type) {
176                 local->hw.conf.channel = chan;
177                 local->hw.conf.channel_type = channel_type;
178                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
179         }
180
181         if (scan_chan)
182                 power = chan->max_power;
183         else
184                 power = local->power_constr_level ?
185                         (chan->max_power - local->power_constr_level) :
186                         chan->max_power;
187
188         if (local->user_power_level >= 0)
189                 power = min(power, local->user_power_level);
190
191         if (local->hw.conf.power_level != power) {
192                 changed |= IEEE80211_CONF_CHANGE_POWER;
193                 local->hw.conf.power_level = power;
194         }
195
196         if (changed && local->open_count) {
197                 ret = drv_config(local, changed);
198                 /*
199                  * Goal:
200                  * HW reconfiguration should never fail, the driver has told
201                  * us what it can support so it should live up to that promise.
202                  *
203                  * Current status:
204                  * rfkill is not integrated with mac80211 and a
205                  * configuration command can thus fail if hardware rfkill
206                  * is enabled
207                  *
208                  * FIXME: integrate rfkill with mac80211 and then add this
209                  * WARN_ON() back
210                  *
211                  */
212                 /* WARN_ON(ret); */
213         }
214
215         return ret;
216 }
217
218 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
219                                       u32 changed)
220 {
221         struct ieee80211_local *local = sdata->local;
222
223         if (!changed)
224                 return;
225
226         if (sdata->vif.type == NL80211_IFTYPE_STATION)
227                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
228         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
229                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
230         else if (sdata->vif.type == NL80211_IFTYPE_AP)
231                 sdata->vif.bss_conf.bssid = sdata->dev->dev_addr;
232         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
233                 static const u8 zero[ETH_ALEN] = { 0 };
234                 sdata->vif.bss_conf.bssid = zero;
235         } else {
236                 WARN_ON(1);
237                 return;
238         }
239
240         switch (sdata->vif.type) {
241         case NL80211_IFTYPE_AP:
242         case NL80211_IFTYPE_ADHOC:
243         case NL80211_IFTYPE_MESH_POINT:
244                 break;
245         default:
246                 /* do not warn to simplify caller in scan.c */
247                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
248                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
249                         return;
250                 break;
251         }
252
253         if (changed & BSS_CHANGED_BEACON_ENABLED) {
254                 if (local->sw_scanning) {
255                         sdata->vif.bss_conf.enable_beacon = false;
256                 } else {
257                         /*
258                          * Beacon should be enabled, but AP mode must
259                          * check whether there is a beacon configured.
260                          */
261                         switch (sdata->vif.type) {
262                         case NL80211_IFTYPE_AP:
263                                 sdata->vif.bss_conf.enable_beacon =
264                                         !!rcu_dereference(sdata->u.ap.beacon);
265                                 break;
266                         case NL80211_IFTYPE_ADHOC:
267                                 sdata->vif.bss_conf.enable_beacon =
268                                         !!rcu_dereference(sdata->u.ibss.presp);
269                                 break;
270                         case NL80211_IFTYPE_MESH_POINT:
271                                 sdata->vif.bss_conf.enable_beacon = true;
272                                 break;
273                         default:
274                                 /* not reached */
275                                 WARN_ON(1);
276                                 break;
277                         }
278                 }
279         }
280
281         drv_bss_info_changed(local, &sdata->vif,
282                              &sdata->vif.bss_conf, changed);
283
284         /*
285          * DEPRECATED
286          *
287          * ~changed is just there to not do this at resume time
288          */
289         if (changed & BSS_CHANGED_BEACON_INT && ~changed) {
290                 local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int;
291                 ieee80211_hw_config(local,
292                                     _IEEE80211_CONF_CHANGE_BEACON_INTERVAL);
293         }
294 }
295
296 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
297 {
298         sdata->vif.bss_conf.use_cts_prot = false;
299         sdata->vif.bss_conf.use_short_preamble = false;
300         sdata->vif.bss_conf.use_short_slot = false;
301         return BSS_CHANGED_ERP_CTS_PROT |
302                BSS_CHANGED_ERP_PREAMBLE |
303                BSS_CHANGED_ERP_SLOT;
304 }
305
306 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
307                                  struct sk_buff *skb)
308 {
309         struct ieee80211_local *local = hw_to_local(hw);
310         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
311         int tmp;
312
313         skb->dev = local->mdev;
314         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
315         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
316                        &local->skb_queue : &local->skb_queue_unreliable, skb);
317         tmp = skb_queue_len(&local->skb_queue) +
318                 skb_queue_len(&local->skb_queue_unreliable);
319         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
320                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
321                 dev_kfree_skb_irq(skb);
322                 tmp--;
323                 I802_DEBUG_INC(local->tx_status_drop);
324         }
325         tasklet_schedule(&local->tasklet);
326 }
327 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
328
329 static void ieee80211_tasklet_handler(unsigned long data)
330 {
331         struct ieee80211_local *local = (struct ieee80211_local *) data;
332         struct sk_buff *skb;
333         struct ieee80211_rx_status rx_status;
334         struct ieee80211_ra_tid *ra_tid;
335
336         while ((skb = skb_dequeue(&local->skb_queue)) ||
337                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
338                 switch (skb->pkt_type) {
339                 case IEEE80211_RX_MSG:
340                         /* status is in skb->cb */
341                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
342                         /* Clear skb->pkt_type in order to not confuse kernel
343                          * netstack. */
344                         skb->pkt_type = 0;
345                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
346                         break;
347                 case IEEE80211_TX_STATUS_MSG:
348                         skb->pkt_type = 0;
349                         ieee80211_tx_status(local_to_hw(local), skb);
350                         break;
351                 case IEEE80211_DELBA_MSG:
352                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
353                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
354                                                 ra_tid->ra, ra_tid->tid);
355                         dev_kfree_skb(skb);
356                         break;
357                 case IEEE80211_ADDBA_MSG:
358                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
359                         ieee80211_start_tx_ba_cb(local_to_hw(local),
360                                                  ra_tid->ra, ra_tid->tid);
361                         dev_kfree_skb(skb);
362                         break ;
363                 default:
364                         WARN(1, "mac80211: Packet is of unknown type %d\n",
365                              skb->pkt_type);
366                         dev_kfree_skb(skb);
367                         break;
368                 }
369         }
370 }
371
372 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
373  * make a prepared TX frame (one that has been given to hw) to look like brand
374  * new IEEE 802.11 frame that is ready to go through TX processing again.
375  */
376 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
377                                       struct ieee80211_key *key,
378                                       struct sk_buff *skb)
379 {
380         unsigned int hdrlen, iv_len, mic_len;
381         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
382
383         hdrlen = ieee80211_hdrlen(hdr->frame_control);
384
385         if (!key)
386                 goto no_key;
387
388         switch (key->conf.alg) {
389         case ALG_WEP:
390                 iv_len = WEP_IV_LEN;
391                 mic_len = WEP_ICV_LEN;
392                 break;
393         case ALG_TKIP:
394                 iv_len = TKIP_IV_LEN;
395                 mic_len = TKIP_ICV_LEN;
396                 break;
397         case ALG_CCMP:
398                 iv_len = CCMP_HDR_LEN;
399                 mic_len = CCMP_MIC_LEN;
400                 break;
401         default:
402                 goto no_key;
403         }
404
405         if (skb->len >= hdrlen + mic_len &&
406             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
407                 skb_trim(skb, skb->len - mic_len);
408         if (skb->len >= hdrlen + iv_len) {
409                 memmove(skb->data + iv_len, skb->data, hdrlen);
410                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
411         }
412
413 no_key:
414         if (ieee80211_is_data_qos(hdr->frame_control)) {
415                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
416                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
417                         hdrlen - IEEE80211_QOS_CTL_LEN);
418                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
419         }
420 }
421
422 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
423                                             struct sta_info *sta,
424                                             struct sk_buff *skb)
425 {
426         sta->tx_filtered_count++;
427
428         /*
429          * Clear the TX filter mask for this STA when sending the next
430          * packet. If the STA went to power save mode, this will happen
431          * when it wakes up for the next time.
432          */
433         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
434
435         /*
436          * This code races in the following way:
437          *
438          *  (1) STA sends frame indicating it will go to sleep and does so
439          *  (2) hardware/firmware adds STA to filter list, passes frame up
440          *  (3) hardware/firmware processes TX fifo and suppresses a frame
441          *  (4) we get TX status before having processed the frame and
442          *      knowing that the STA has gone to sleep.
443          *
444          * This is actually quite unlikely even when both those events are
445          * processed from interrupts coming in quickly after one another or
446          * even at the same time because we queue both TX status events and
447          * RX frames to be processed by a tasklet and process them in the
448          * same order that they were received or TX status last. Hence, there
449          * is no race as long as the frame RX is processed before the next TX
450          * status, which drivers can ensure, see below.
451          *
452          * Note that this can only happen if the hardware or firmware can
453          * actually add STAs to the filter list, if this is done by the
454          * driver in response to set_tim() (which will only reduce the race
455          * this whole filtering tries to solve, not completely solve it)
456          * this situation cannot happen.
457          *
458          * To completely solve this race drivers need to make sure that they
459          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
460          *      functions and
461          *  (b) always process RX events before TX status events if ordering
462          *      can be unknown, for example with different interrupt status
463          *      bits.
464          */
465         if (test_sta_flags(sta, WLAN_STA_PS) &&
466             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
467                 ieee80211_remove_tx_extra(local, sta->key, skb);
468                 skb_queue_tail(&sta->tx_filtered, skb);
469                 return;
470         }
471
472         if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
473                 /* Software retry the packet once */
474                 skb->requeue = 1;
475                 ieee80211_remove_tx_extra(local, sta->key, skb);
476                 dev_queue_xmit(skb);
477                 return;
478         }
479
480 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
481         if (net_ratelimit())
482                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
483                        "queue_len=%d PS=%d @%lu\n",
484                        wiphy_name(local->hw.wiphy),
485                        skb_queue_len(&sta->tx_filtered),
486                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
487 #endif
488         dev_kfree_skb(skb);
489 }
490
491 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
492 {
493         struct sk_buff *skb2;
494         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
495         struct ieee80211_local *local = hw_to_local(hw);
496         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
497         u16 frag, type;
498         __le16 fc;
499         struct ieee80211_supported_band *sband;
500         struct ieee80211_tx_status_rtap_hdr *rthdr;
501         struct ieee80211_sub_if_data *sdata;
502         struct net_device *prev_dev = NULL;
503         struct sta_info *sta;
504         int retry_count = -1, i;
505
506         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
507                 /* the HW cannot have attempted that rate */
508                 if (i >= hw->max_rates) {
509                         info->status.rates[i].idx = -1;
510                         info->status.rates[i].count = 0;
511                 }
512
513                 retry_count += info->status.rates[i].count;
514         }
515         if (retry_count < 0)
516                 retry_count = 0;
517
518         rcu_read_lock();
519
520         sband = local->hw.wiphy->bands[info->band];
521
522         sta = sta_info_get(local, hdr->addr1);
523
524         if (sta) {
525                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
526                     test_sta_flags(sta, WLAN_STA_PS)) {
527                         /*
528                          * The STA is in power save mode, so assume
529                          * that this TX packet failed because of that.
530                          */
531                         ieee80211_handle_filtered_frame(local, sta, skb);
532                         rcu_read_unlock();
533                         return;
534                 }
535
536                 fc = hdr->frame_control;
537
538                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
539                     (ieee80211_is_data_qos(fc))) {
540                         u16 tid, ssn;
541                         u8 *qc;
542
543                         qc = ieee80211_get_qos_ctl(hdr);
544                         tid = qc[0] & 0xf;
545                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
546                                                 & IEEE80211_SCTL_SEQ);
547                         ieee80211_send_bar(sta->sdata, hdr->addr1,
548                                            tid, ssn);
549                 }
550
551                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
552                         ieee80211_handle_filtered_frame(local, sta, skb);
553                         rcu_read_unlock();
554                         return;
555                 } else {
556                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
557                                 sta->tx_retry_failed++;
558                         sta->tx_retry_count += retry_count;
559                 }
560
561                 rate_control_tx_status(local, sband, sta, skb);
562         }
563
564         rcu_read_unlock();
565
566         ieee80211_led_tx(local, 0);
567
568         /* SNMP counters
569          * Fragments are passed to low-level drivers as separate skbs, so these
570          * are actually fragments, not frames. Update frame counters only for
571          * the first fragment of the frame. */
572
573         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
574         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
575
576         if (info->flags & IEEE80211_TX_STAT_ACK) {
577                 if (frag == 0) {
578                         local->dot11TransmittedFrameCount++;
579                         if (is_multicast_ether_addr(hdr->addr1))
580                                 local->dot11MulticastTransmittedFrameCount++;
581                         if (retry_count > 0)
582                                 local->dot11RetryCount++;
583                         if (retry_count > 1)
584                                 local->dot11MultipleRetryCount++;
585                 }
586
587                 /* This counter shall be incremented for an acknowledged MPDU
588                  * with an individual address in the address 1 field or an MPDU
589                  * with a multicast address in the address 1 field of type Data
590                  * or Management. */
591                 if (!is_multicast_ether_addr(hdr->addr1) ||
592                     type == IEEE80211_FTYPE_DATA ||
593                     type == IEEE80211_FTYPE_MGMT)
594                         local->dot11TransmittedFragmentCount++;
595         } else {
596                 if (frag == 0)
597                         local->dot11FailedCount++;
598         }
599
600         /* this was a transmitted frame, but now we want to reuse it */
601         skb_orphan(skb);
602
603         /*
604          * This is a bit racy but we can avoid a lot of work
605          * with this test...
606          */
607         if (!local->monitors && !local->cooked_mntrs) {
608                 dev_kfree_skb(skb);
609                 return;
610         }
611
612         /* send frame to monitor interfaces now */
613
614         if (skb_headroom(skb) < sizeof(*rthdr)) {
615                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
616                 dev_kfree_skb(skb);
617                 return;
618         }
619
620         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
621                                 skb_push(skb, sizeof(*rthdr));
622
623         memset(rthdr, 0, sizeof(*rthdr));
624         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
625         rthdr->hdr.it_present =
626                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
627                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
628                             (1 << IEEE80211_RADIOTAP_RATE));
629
630         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
631             !is_multicast_ether_addr(hdr->addr1))
632                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
633
634         /*
635          * XXX: Once radiotap gets the bitmap reset thing the vendor
636          *      extensions proposal contains, we can actually report
637          *      the whole set of tries we did.
638          */
639         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
640             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
641                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
642         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
643                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
644         if (info->status.rates[0].idx >= 0 &&
645             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
646                 rthdr->rate = sband->bitrates[
647                                 info->status.rates[0].idx].bitrate / 5;
648
649         /* for now report the total retry_count */
650         rthdr->data_retries = retry_count;
651
652         /* XXX: is this sufficient for BPF? */
653         skb_set_mac_header(skb, 0);
654         skb->ip_summed = CHECKSUM_UNNECESSARY;
655         skb->pkt_type = PACKET_OTHERHOST;
656         skb->protocol = htons(ETH_P_802_2);
657         memset(skb->cb, 0, sizeof(skb->cb));
658
659         rcu_read_lock();
660         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
661                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
662                         if (!netif_running(sdata->dev))
663                                 continue;
664
665                         if (prev_dev) {
666                                 skb2 = skb_clone(skb, GFP_ATOMIC);
667                                 if (skb2) {
668                                         skb2->dev = prev_dev;
669                                         netif_rx(skb2);
670                                 }
671                         }
672
673                         prev_dev = sdata->dev;
674                 }
675         }
676         if (prev_dev) {
677                 skb->dev = prev_dev;
678                 netif_rx(skb);
679                 skb = NULL;
680         }
681         rcu_read_unlock();
682         dev_kfree_skb(skb);
683 }
684 EXPORT_SYMBOL(ieee80211_tx_status);
685
686 static void ieee80211_restart_work(struct work_struct *work)
687 {
688         struct ieee80211_local *local =
689                 container_of(work, struct ieee80211_local, restart_work);
690
691         rtnl_lock();
692         ieee80211_reconfig(local);
693         rtnl_unlock();
694 }
695
696 void ieee80211_restart_hw(struct ieee80211_hw *hw)
697 {
698         struct ieee80211_local *local = hw_to_local(hw);
699
700         /* use this reason, __ieee80211_resume will unblock it */
701         ieee80211_stop_queues_by_reason(hw,
702                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
703
704         schedule_work(&local->restart_work);
705 }
706 EXPORT_SYMBOL(ieee80211_restart_hw);
707
708 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
709                                         const struct ieee80211_ops *ops)
710 {
711         struct ieee80211_local *local;
712         int priv_size, i;
713         struct wiphy *wiphy;
714
715         /* Ensure 32-byte alignment of our private data and hw private data.
716          * We use the wiphy priv data for both our ieee80211_local and for
717          * the driver's private data
718          *
719          * In memory it'll be like this:
720          *
721          * +-------------------------+
722          * | struct wiphy           |
723          * +-------------------------+
724          * | struct ieee80211_local  |
725          * +-------------------------+
726          * | driver's private data   |
727          * +-------------------------+
728          *
729          */
730         priv_size = ((sizeof(struct ieee80211_local) +
731                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
732                     priv_data_len;
733
734         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
735
736         if (!wiphy)
737                 return NULL;
738
739         wiphy->privid = mac80211_wiphy_privid;
740
741         /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
742         wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
743                                sizeof(struct cfg80211_bss);
744
745         local = wiphy_priv(wiphy);
746
747         local->hw.wiphy = wiphy;
748
749         local->hw.priv = (char *)local +
750                          ((sizeof(struct ieee80211_local) +
751                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
752
753         BUG_ON(!ops->tx);
754         BUG_ON(!ops->start);
755         BUG_ON(!ops->stop);
756         BUG_ON(!ops->config);
757         BUG_ON(!ops->add_interface);
758         BUG_ON(!ops->remove_interface);
759         BUG_ON(!ops->configure_filter);
760         local->ops = ops;
761
762         /* set up some defaults */
763         local->hw.queues = 1;
764         local->hw.max_rates = 1;
765         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
766         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
767         local->hw.conf.radio_enabled = true;
768         local->user_power_level = -1;
769
770         INIT_LIST_HEAD(&local->interfaces);
771         mutex_init(&local->iflist_mtx);
772         mutex_init(&local->scan_mtx);
773
774         spin_lock_init(&local->key_lock);
775
776         spin_lock_init(&local->queue_stop_reason_lock);
777
778         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
779
780         INIT_WORK(&local->restart_work, ieee80211_restart_work);
781
782         INIT_WORK(&local->dynamic_ps_enable_work,
783                   ieee80211_dynamic_ps_enable_work);
784         INIT_WORK(&local->dynamic_ps_disable_work,
785                   ieee80211_dynamic_ps_disable_work);
786         setup_timer(&local->dynamic_ps_timer,
787                     ieee80211_dynamic_ps_timer, (unsigned long) local);
788
789         sta_info_init(local);
790
791         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
792                 skb_queue_head_init(&local->pending[i]);
793         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
794                      (unsigned long)local);
795         tasklet_disable(&local->tx_pending_tasklet);
796
797         tasklet_init(&local->tasklet,
798                      ieee80211_tasklet_handler,
799                      (unsigned long) local);
800         tasklet_disable(&local->tasklet);
801
802         skb_queue_head_init(&local->skb_queue);
803         skb_queue_head_init(&local->skb_queue_unreliable);
804
805         spin_lock_init(&local->ampdu_lock);
806
807         return local_to_hw(local);
808 }
809 EXPORT_SYMBOL(ieee80211_alloc_hw);
810
811 static const struct net_device_ops ieee80211_master_ops = {
812         .ndo_start_xmit = ieee80211_master_start_xmit,
813         .ndo_open = ieee80211_master_open,
814         .ndo_stop = ieee80211_master_stop,
815         .ndo_set_multicast_list = ieee80211_master_set_multicast_list,
816         .ndo_select_queue = ieee80211_select_queue,
817 };
818
819 static void ieee80211_master_setup(struct net_device *mdev)
820 {
821         mdev->type = ARPHRD_IEEE80211;
822         mdev->netdev_ops = &ieee80211_master_ops;
823         mdev->header_ops = &ieee80211_header_ops;
824         mdev->tx_queue_len = 1000;
825         mdev->addr_len = ETH_ALEN;
826 }
827
828 int ieee80211_register_hw(struct ieee80211_hw *hw)
829 {
830         struct ieee80211_local *local = hw_to_local(hw);
831         int result;
832         enum ieee80211_band band;
833         struct net_device *mdev;
834         struct ieee80211_master_priv *mpriv;
835         int channels, i, j, max_bitrates;
836         bool supp_ht;
837         static const u32 cipher_suites[] = {
838                 WLAN_CIPHER_SUITE_WEP40,
839                 WLAN_CIPHER_SUITE_WEP104,
840                 WLAN_CIPHER_SUITE_TKIP,
841                 WLAN_CIPHER_SUITE_CCMP,
842
843                 /* keep last -- depends on hw flags! */
844                 WLAN_CIPHER_SUITE_AES_CMAC
845         };
846
847         /*
848          * generic code guarantees at least one band,
849          * set this very early because much code assumes
850          * that hw.conf.channel is assigned
851          */
852         channels = 0;
853         max_bitrates = 0;
854         supp_ht = false;
855         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
856                 struct ieee80211_supported_band *sband;
857
858                 sband = local->hw.wiphy->bands[band];
859                 if (!sband)
860                         continue;
861                 if (!local->oper_channel) {
862                         /* init channel we're on */
863                         local->hw.conf.channel =
864                         local->oper_channel = &sband->channels[0];
865                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
866                 }
867                 channels += sband->n_channels;
868
869                 if (max_bitrates < sband->n_bitrates)
870                         max_bitrates = sband->n_bitrates;
871                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
872         }
873
874         local->int_scan_req.n_channels = channels;
875         local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
876         if (!local->int_scan_req.channels)
877                 return -ENOMEM;
878
879         /* if low-level driver supports AP, we also support VLAN */
880         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
881                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
882
883         /* mac80211 always supports monitor */
884         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
885
886         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
887                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
888         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
889                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
890
891         /*
892          * Calculate scan IE length -- we need this to alloc
893          * memory and to subtract from the driver limit. It
894          * includes the (extended) supported rates and HT
895          * information -- SSID is the driver's responsibility.
896          */
897         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
898         if (supp_ht)
899                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
900
901         if (!local->ops->hw_scan) {
902                 /* For hw_scan, driver needs to set these up. */
903                 local->hw.wiphy->max_scan_ssids = 4;
904                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
905         }
906
907         /*
908          * If the driver supports any scan IEs, then assume the
909          * limit includes the IEs mac80211 will add, otherwise
910          * leave it at zero and let the driver sort it out; we
911          * still pass our IEs to the driver but userspace will
912          * not be allowed to in that case.
913          */
914         if (local->hw.wiphy->max_scan_ie_len)
915                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
916
917         local->hw.wiphy->cipher_suites = cipher_suites;
918         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
919         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
920                 local->hw.wiphy->n_cipher_suites--;
921
922         result = wiphy_register(local->hw.wiphy);
923         if (result < 0)
924                 goto fail_wiphy_register;
925
926         /*
927          * We use the number of queues for feature tests (QoS, HT) internally
928          * so restrict them appropriately.
929          */
930         if (hw->queues > IEEE80211_MAX_QUEUES)
931                 hw->queues = IEEE80211_MAX_QUEUES;
932
933         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
934                                "wmaster%d", ieee80211_master_setup,
935                                hw->queues);
936         if (!mdev)
937                 goto fail_mdev_alloc;
938
939         mpriv = netdev_priv(mdev);
940         mpriv->local = local;
941         local->mdev = mdev;
942
943         local->hw.workqueue =
944                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
945         if (!local->hw.workqueue) {
946                 result = -ENOMEM;
947                 goto fail_workqueue;
948         }
949
950         /*
951          * The hardware needs headroom for sending the frame,
952          * and we need some headroom for passing the frame to monitor
953          * interfaces, but never both at the same time.
954          */
955         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
956                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
957
958         debugfs_hw_add(local);
959
960         if (local->hw.max_listen_interval == 0)
961                 local->hw.max_listen_interval = 1;
962
963         local->hw.conf.listen_interval = local->hw.max_listen_interval;
964
965         result = sta_info_start(local);
966         if (result < 0)
967                 goto fail_sta_info;
968
969         result = ieee80211_wep_init(local);
970         if (result < 0) {
971                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
972                        wiphy_name(local->hw.wiphy), result);
973                 goto fail_wep;
974         }
975
976         rtnl_lock();
977         result = dev_alloc_name(local->mdev, local->mdev->name);
978         if (result < 0)
979                 goto fail_dev;
980
981         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
982         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
983         local->mdev->features |= NETIF_F_NETNS_LOCAL;
984
985         result = register_netdevice(local->mdev);
986         if (result < 0)
987                 goto fail_dev;
988
989         result = ieee80211_init_rate_ctrl_alg(local,
990                                               hw->rate_control_algorithm);
991         if (result < 0) {
992                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
993                        "algorithm\n", wiphy_name(local->hw.wiphy));
994                 goto fail_rate;
995         }
996
997         /* add one default STA interface if supported */
998         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
999                 result = ieee80211_if_add(local, "wlan%d", NULL,
1000                                           NL80211_IFTYPE_STATION, NULL);
1001                 if (result)
1002                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1003                                wiphy_name(local->hw.wiphy));
1004         }
1005
1006         rtnl_unlock();
1007
1008         ieee80211_led_init(local);
1009
1010         /* alloc internal scan request */
1011         i = 0;
1012         local->int_scan_req.ssids = &local->scan_ssid;
1013         local->int_scan_req.n_ssids = 1;
1014         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1015                 if (!hw->wiphy->bands[band])
1016                         continue;
1017                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
1018                         local->int_scan_req.channels[i] =
1019                                 &hw->wiphy->bands[band]->channels[j];
1020                         i++;
1021                 }
1022         }
1023
1024         local->network_latency_notifier.notifier_call =
1025                 ieee80211_max_network_latency;
1026         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
1027                                      &local->network_latency_notifier);
1028
1029         if (result) {
1030                 rtnl_lock();
1031                 goto fail_pm_qos;
1032         }
1033
1034         return 0;
1035
1036  fail_pm_qos:
1037         ieee80211_led_exit(local);
1038         ieee80211_remove_interfaces(local);
1039  fail_rate:
1040         unregister_netdevice(local->mdev);
1041         local->mdev = NULL;
1042  fail_dev:
1043         rtnl_unlock();
1044         ieee80211_wep_free(local);
1045  fail_wep:
1046         sta_info_stop(local);
1047  fail_sta_info:
1048         debugfs_hw_del(local);
1049         destroy_workqueue(local->hw.workqueue);
1050  fail_workqueue:
1051         if (local->mdev)
1052                 free_netdev(local->mdev);
1053  fail_mdev_alloc:
1054         wiphy_unregister(local->hw.wiphy);
1055  fail_wiphy_register:
1056         kfree(local->int_scan_req.channels);
1057         return result;
1058 }
1059 EXPORT_SYMBOL(ieee80211_register_hw);
1060
1061 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1062 {
1063         struct ieee80211_local *local = hw_to_local(hw);
1064
1065         tasklet_kill(&local->tx_pending_tasklet);
1066         tasklet_kill(&local->tasklet);
1067
1068         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1069                                &local->network_latency_notifier);
1070
1071         rtnl_lock();
1072
1073         /*
1074          * At this point, interface list manipulations are fine
1075          * because the driver cannot be handing us frames any
1076          * more and the tasklet is killed.
1077          */
1078
1079         /* First, we remove all virtual interfaces. */
1080         ieee80211_remove_interfaces(local);
1081
1082         /* then, finally, remove the master interface */
1083         unregister_netdevice(local->mdev);
1084
1085         rtnl_unlock();
1086
1087         ieee80211_clear_tx_pending(local);
1088         sta_info_stop(local);
1089         rate_control_deinitialize(local);
1090         debugfs_hw_del(local);
1091
1092         if (skb_queue_len(&local->skb_queue)
1093                         || skb_queue_len(&local->skb_queue_unreliable))
1094                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1095                        wiphy_name(local->hw.wiphy));
1096         skb_queue_purge(&local->skb_queue);
1097         skb_queue_purge(&local->skb_queue_unreliable);
1098
1099         destroy_workqueue(local->hw.workqueue);
1100         wiphy_unregister(local->hw.wiphy);
1101         ieee80211_wep_free(local);
1102         ieee80211_led_exit(local);
1103         free_netdev(local->mdev);
1104         kfree(local->int_scan_req.channels);
1105 }
1106 EXPORT_SYMBOL(ieee80211_unregister_hw);
1107
1108 void ieee80211_free_hw(struct ieee80211_hw *hw)
1109 {
1110         struct ieee80211_local *local = hw_to_local(hw);
1111
1112         mutex_destroy(&local->iflist_mtx);
1113         mutex_destroy(&local->scan_mtx);
1114
1115         wiphy_free(local->hw.wiphy);
1116 }
1117 EXPORT_SYMBOL(ieee80211_free_hw);
1118
1119 static int __init ieee80211_init(void)
1120 {
1121         struct sk_buff *skb;
1122         int ret;
1123
1124         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1125         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1126                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1127
1128         ret = rc80211_minstrel_init();
1129         if (ret)
1130                 return ret;
1131
1132         ret = rc80211_pid_init();
1133         if (ret)
1134                 return ret;
1135
1136         ieee80211_debugfs_netdev_init();
1137
1138         return 0;
1139 }
1140
1141 static void __exit ieee80211_exit(void)
1142 {
1143         rc80211_pid_exit();
1144         rc80211_minstrel_exit();
1145
1146         /*
1147          * For key todo, it'll be empty by now but the work
1148          * might still be scheduled.
1149          */
1150         flush_scheduled_work();
1151
1152         if (mesh_allocated)
1153                 ieee80211s_stop();
1154
1155         ieee80211_debugfs_netdev_exit();
1156 }
1157
1158
1159 subsys_initcall(ieee80211_init);
1160 module_exit(ieee80211_exit);
1161
1162 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1163 MODULE_LICENSE("GPL");