Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
[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 <net/net_namespace.h>
25 #include <net/cfg80211.h>
26
27 #include "ieee80211_i.h"
28 #include "rate.h"
29 #include "mesh.h"
30 #include "wep.h"
31 #include "wme.h"
32 #include "aes_ccm.h"
33 #include "led.h"
34 #include "cfg.h"
35 #include "debugfs.h"
36 #include "debugfs_netdev.h"
37
38 /*
39  * For seeing transmitted packets on monitor interfaces
40  * we have a radiotap header too.
41  */
42 struct ieee80211_tx_status_rtap_hdr {
43         struct ieee80211_radiotap_header hdr;
44         u8 rate;
45         u8 padding_for_rate;
46         __le16 tx_flags;
47         u8 data_retries;
48 } __attribute__ ((packed));
49
50
51 /* must be called under mdev tx lock */
52 void ieee80211_configure_filter(struct ieee80211_local *local)
53 {
54         unsigned int changed_flags;
55         unsigned int new_flags = 0;
56
57         if (atomic_read(&local->iff_promiscs))
58                 new_flags |= FIF_PROMISC_IN_BSS;
59
60         if (atomic_read(&local->iff_allmultis))
61                 new_flags |= FIF_ALLMULTI;
62
63         if (local->monitors)
64                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
65
66         if (local->fif_fcsfail)
67                 new_flags |= FIF_FCSFAIL;
68
69         if (local->fif_plcpfail)
70                 new_flags |= FIF_PLCPFAIL;
71
72         if (local->fif_control)
73                 new_flags |= FIF_CONTROL;
74
75         if (local->fif_other_bss)
76                 new_flags |= FIF_OTHER_BSS;
77
78         changed_flags = local->filter_flags ^ new_flags;
79
80         /* be a bit nasty */
81         new_flags |= (1<<31);
82
83         local->ops->configure_filter(local_to_hw(local),
84                                      changed_flags, &new_flags,
85                                      local->mdev->mc_count,
86                                      local->mdev->mc_list);
87
88         WARN_ON(new_flags & (1<<31));
89
90         local->filter_flags = new_flags & ~(1<<31);
91 }
92
93 /* master interface */
94
95 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
96 {
97         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
98         return ETH_ALEN;
99 }
100
101 static const struct header_ops ieee80211_header_ops = {
102         .create         = eth_header,
103         .parse          = header_parse_80211,
104         .rebuild        = eth_rebuild_header,
105         .cache          = eth_header_cache,
106         .cache_update   = eth_header_cache_update,
107 };
108
109 static int ieee80211_master_open(struct net_device *dev)
110 {
111         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
112         struct ieee80211_local *local = mpriv->local;
113         struct ieee80211_sub_if_data *sdata;
114         int res = -EOPNOTSUPP;
115
116         /* we hold the RTNL here so can safely walk the list */
117         list_for_each_entry(sdata, &local->interfaces, list) {
118                 if (netif_running(sdata->dev)) {
119                         res = 0;
120                         break;
121                 }
122         }
123
124         if (res)
125                 return res;
126
127         netif_tx_start_all_queues(local->mdev);
128
129         return 0;
130 }
131
132 static int ieee80211_master_stop(struct net_device *dev)
133 {
134         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
135         struct ieee80211_local *local = mpriv->local;
136         struct ieee80211_sub_if_data *sdata;
137
138         /* we hold the RTNL here so can safely walk the list */
139         list_for_each_entry(sdata, &local->interfaces, list)
140                 if (netif_running(sdata->dev))
141                         dev_close(sdata->dev);
142
143         return 0;
144 }
145
146 static void ieee80211_master_set_multicast_list(struct net_device *dev)
147 {
148         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
149         struct ieee80211_local *local = mpriv->local;
150
151         ieee80211_configure_filter(local);
152 }
153
154 /* everything else */
155
156 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
157 {
158         struct ieee80211_local *local = sdata->local;
159         struct ieee80211_if_conf conf;
160
161         if (WARN_ON(!netif_running(sdata->dev)))
162                 return 0;
163
164         memset(&conf, 0, sizeof(conf));
165
166         if (sdata->vif.type == NL80211_IFTYPE_STATION)
167                 conf.bssid = sdata->u.mgd.bssid;
168         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
169                 conf.bssid = sdata->u.ibss.bssid;
170         else if (sdata->vif.type == NL80211_IFTYPE_AP)
171                 conf.bssid = sdata->dev->dev_addr;
172         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
173                 static const u8 zero[ETH_ALEN] = { 0 };
174                 conf.bssid = zero;
175         } else {
176                 WARN_ON(1);
177                 return -EINVAL;
178         }
179
180         if (!local->ops->config_interface)
181                 return 0;
182
183         switch (sdata->vif.type) {
184         case NL80211_IFTYPE_AP:
185         case NL80211_IFTYPE_ADHOC:
186         case NL80211_IFTYPE_MESH_POINT:
187                 break;
188         default:
189                 /* do not warn to simplify caller in scan.c */
190                 changed &= ~IEEE80211_IFCC_BEACON_ENABLED;
191                 if (WARN_ON(changed & IEEE80211_IFCC_BEACON))
192                         return -EINVAL;
193                 changed &= ~IEEE80211_IFCC_BEACON;
194                 break;
195         }
196
197         if (changed & IEEE80211_IFCC_BEACON_ENABLED) {
198                 if (local->sw_scanning) {
199                         conf.enable_beacon = false;
200                 } else {
201                         /*
202                          * Beacon should be enabled, but AP mode must
203                          * check whether there is a beacon configured.
204                          */
205                         switch (sdata->vif.type) {
206                         case NL80211_IFTYPE_AP:
207                                 conf.enable_beacon =
208                                         !!rcu_dereference(sdata->u.ap.beacon);
209                                 break;
210                         case NL80211_IFTYPE_ADHOC:
211                                 conf.enable_beacon = !!sdata->u.ibss.probe_resp;
212                                 break;
213                         case NL80211_IFTYPE_MESH_POINT:
214                                 conf.enable_beacon = true;
215                                 break;
216                         default:
217                                 /* not reached */
218                                 WARN_ON(1);
219                                 break;
220                         }
221                 }
222         }
223
224         conf.changed = changed;
225
226         return local->ops->config_interface(local_to_hw(local),
227                                             &sdata->vif, &conf);
228 }
229
230 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
231 {
232         struct ieee80211_channel *chan;
233         int ret = 0;
234         int power;
235         enum nl80211_channel_type channel_type;
236
237         might_sleep();
238
239         if (local->sw_scanning) {
240                 chan = local->scan_channel;
241                 channel_type = NL80211_CHAN_NO_HT;
242         } else {
243                 chan = local->oper_channel;
244                 channel_type = local->oper_channel_type;
245         }
246
247         if (chan != local->hw.conf.channel ||
248             channel_type != local->hw.conf.channel_type) {
249                 local->hw.conf.channel = chan;
250                 local->hw.conf.channel_type = channel_type;
251                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
252         }
253
254         if (local->sw_scanning)
255                 power = chan->max_power;
256         else
257                 power = local->power_constr_level ?
258                         (chan->max_power - local->power_constr_level) :
259                         chan->max_power;
260
261         if (local->user_power_level >= 0)
262                 power = min(power, local->user_power_level);
263
264         if (local->hw.conf.power_level != power) {
265                 changed |= IEEE80211_CONF_CHANGE_POWER;
266                 local->hw.conf.power_level = power;
267         }
268
269         if (changed && local->open_count) {
270                 ret = local->ops->config(local_to_hw(local), changed);
271                 /*
272                  * Goal:
273                  * HW reconfiguration should never fail, the driver has told
274                  * us what it can support so it should live up to that promise.
275                  *
276                  * Current status:
277                  * rfkill is not integrated with mac80211 and a
278                  * configuration command can thus fail if hardware rfkill
279                  * is enabled
280                  *
281                  * FIXME: integrate rfkill with mac80211 and then add this
282                  * WARN_ON() back
283                  *
284                  */
285                 /* WARN_ON(ret); */
286         }
287
288         return ret;
289 }
290
291 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
292                                       u32 changed)
293 {
294         struct ieee80211_local *local = sdata->local;
295
296         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
297                 return;
298
299         if (!changed)
300                 return;
301
302         if (local->ops->bss_info_changed)
303                 local->ops->bss_info_changed(local_to_hw(local),
304                                              &sdata->vif,
305                                              &sdata->vif.bss_conf,
306                                              changed);
307 }
308
309 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
310 {
311         sdata->vif.bss_conf.use_cts_prot = false;
312         sdata->vif.bss_conf.use_short_preamble = false;
313         sdata->vif.bss_conf.use_short_slot = false;
314         return BSS_CHANGED_ERP_CTS_PROT |
315                BSS_CHANGED_ERP_PREAMBLE |
316                BSS_CHANGED_ERP_SLOT;
317 }
318
319 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
320                                  struct sk_buff *skb)
321 {
322         struct ieee80211_local *local = hw_to_local(hw);
323         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
324         int tmp;
325
326         skb->dev = local->mdev;
327         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
328         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
329                        &local->skb_queue : &local->skb_queue_unreliable, skb);
330         tmp = skb_queue_len(&local->skb_queue) +
331                 skb_queue_len(&local->skb_queue_unreliable);
332         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
333                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
334                 dev_kfree_skb_irq(skb);
335                 tmp--;
336                 I802_DEBUG_INC(local->tx_status_drop);
337         }
338         tasklet_schedule(&local->tasklet);
339 }
340 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
341
342 static void ieee80211_tasklet_handler(unsigned long data)
343 {
344         struct ieee80211_local *local = (struct ieee80211_local *) data;
345         struct sk_buff *skb;
346         struct ieee80211_rx_status rx_status;
347         struct ieee80211_ra_tid *ra_tid;
348
349         while ((skb = skb_dequeue(&local->skb_queue)) ||
350                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
351                 switch (skb->pkt_type) {
352                 case IEEE80211_RX_MSG:
353                         /* status is in skb->cb */
354                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
355                         /* Clear skb->pkt_type in order to not confuse kernel
356                          * netstack. */
357                         skb->pkt_type = 0;
358                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
359                         break;
360                 case IEEE80211_TX_STATUS_MSG:
361                         skb->pkt_type = 0;
362                         ieee80211_tx_status(local_to_hw(local), skb);
363                         break;
364                 case IEEE80211_DELBA_MSG:
365                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
366                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
367                                                 ra_tid->ra, ra_tid->tid);
368                         dev_kfree_skb(skb);
369                         break;
370                 case IEEE80211_ADDBA_MSG:
371                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
372                         ieee80211_start_tx_ba_cb(local_to_hw(local),
373                                                  ra_tid->ra, ra_tid->tid);
374                         dev_kfree_skb(skb);
375                         break ;
376                 default:
377                         WARN(1, "mac80211: Packet is of unknown type %d\n",
378                              skb->pkt_type);
379                         dev_kfree_skb(skb);
380                         break;
381                 }
382         }
383 }
384
385 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
386  * make a prepared TX frame (one that has been given to hw) to look like brand
387  * new IEEE 802.11 frame that is ready to go through TX processing again.
388  */
389 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
390                                       struct ieee80211_key *key,
391                                       struct sk_buff *skb)
392 {
393         unsigned int hdrlen, iv_len, mic_len;
394         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
395
396         hdrlen = ieee80211_hdrlen(hdr->frame_control);
397
398         if (!key)
399                 goto no_key;
400
401         switch (key->conf.alg) {
402         case ALG_WEP:
403                 iv_len = WEP_IV_LEN;
404                 mic_len = WEP_ICV_LEN;
405                 break;
406         case ALG_TKIP:
407                 iv_len = TKIP_IV_LEN;
408                 mic_len = TKIP_ICV_LEN;
409                 break;
410         case ALG_CCMP:
411                 iv_len = CCMP_HDR_LEN;
412                 mic_len = CCMP_MIC_LEN;
413                 break;
414         default:
415                 goto no_key;
416         }
417
418         if (skb->len >= hdrlen + mic_len &&
419             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
420                 skb_trim(skb, skb->len - mic_len);
421         if (skb->len >= hdrlen + iv_len) {
422                 memmove(skb->data + iv_len, skb->data, hdrlen);
423                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
424         }
425
426 no_key:
427         if (ieee80211_is_data_qos(hdr->frame_control)) {
428                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
429                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
430                         hdrlen - IEEE80211_QOS_CTL_LEN);
431                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
432         }
433 }
434
435 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
436                                             struct sta_info *sta,
437                                             struct sk_buff *skb)
438 {
439         sta->tx_filtered_count++;
440
441         /*
442          * Clear the TX filter mask for this STA when sending the next
443          * packet. If the STA went to power save mode, this will happen
444          * when it wakes up for the next time.
445          */
446         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
447
448         /*
449          * This code races in the following way:
450          *
451          *  (1) STA sends frame indicating it will go to sleep and does so
452          *  (2) hardware/firmware adds STA to filter list, passes frame up
453          *  (3) hardware/firmware processes TX fifo and suppresses a frame
454          *  (4) we get TX status before having processed the frame and
455          *      knowing that the STA has gone to sleep.
456          *
457          * This is actually quite unlikely even when both those events are
458          * processed from interrupts coming in quickly after one another or
459          * even at the same time because we queue both TX status events and
460          * RX frames to be processed by a tasklet and process them in the
461          * same order that they were received or TX status last. Hence, there
462          * is no race as long as the frame RX is processed before the next TX
463          * status, which drivers can ensure, see below.
464          *
465          * Note that this can only happen if the hardware or firmware can
466          * actually add STAs to the filter list, if this is done by the
467          * driver in response to set_tim() (which will only reduce the race
468          * this whole filtering tries to solve, not completely solve it)
469          * this situation cannot happen.
470          *
471          * To completely solve this race drivers need to make sure that they
472          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
473          *      functions and
474          *  (b) always process RX events before TX status events if ordering
475          *      can be unknown, for example with different interrupt status
476          *      bits.
477          */
478         if (test_sta_flags(sta, WLAN_STA_PS) &&
479             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
480                 ieee80211_remove_tx_extra(local, sta->key, skb);
481                 skb_queue_tail(&sta->tx_filtered, skb);
482                 return;
483         }
484
485         if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
486                 /* Software retry the packet once */
487                 skb->requeue = 1;
488                 ieee80211_remove_tx_extra(local, sta->key, skb);
489                 dev_queue_xmit(skb);
490                 return;
491         }
492
493 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
494         if (net_ratelimit())
495                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
496                        "queue_len=%d PS=%d @%lu\n",
497                        wiphy_name(local->hw.wiphy),
498                        skb_queue_len(&sta->tx_filtered),
499                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
500 #endif
501         dev_kfree_skb(skb);
502 }
503
504 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
505 {
506         struct sk_buff *skb2;
507         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
508         struct ieee80211_local *local = hw_to_local(hw);
509         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
510         u16 frag, type;
511         __le16 fc;
512         struct ieee80211_supported_band *sband;
513         struct ieee80211_tx_status_rtap_hdr *rthdr;
514         struct ieee80211_sub_if_data *sdata;
515         struct net_device *prev_dev = NULL;
516         struct sta_info *sta;
517         int retry_count = -1, i;
518
519         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
520                 /* the HW cannot have attempted that rate */
521                 if (i >= hw->max_rates) {
522                         info->status.rates[i].idx = -1;
523                         info->status.rates[i].count = 0;
524                 }
525
526                 retry_count += info->status.rates[i].count;
527         }
528         if (retry_count < 0)
529                 retry_count = 0;
530
531         rcu_read_lock();
532
533         sband = local->hw.wiphy->bands[info->band];
534
535         sta = sta_info_get(local, hdr->addr1);
536
537         if (sta) {
538                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
539                     test_sta_flags(sta, WLAN_STA_PS)) {
540                         /*
541                          * The STA is in power save mode, so assume
542                          * that this TX packet failed because of that.
543                          */
544                         ieee80211_handle_filtered_frame(local, sta, skb);
545                         rcu_read_unlock();
546                         return;
547                 }
548
549                 fc = hdr->frame_control;
550
551                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
552                     (ieee80211_is_data_qos(fc))) {
553                         u16 tid, ssn;
554                         u8 *qc;
555
556                         qc = ieee80211_get_qos_ctl(hdr);
557                         tid = qc[0] & 0xf;
558                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
559                                                 & IEEE80211_SCTL_SEQ);
560                         ieee80211_send_bar(sta->sdata, hdr->addr1,
561                                            tid, ssn);
562                 }
563
564                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
565                         ieee80211_handle_filtered_frame(local, sta, skb);
566                         rcu_read_unlock();
567                         return;
568                 } else {
569                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
570                                 sta->tx_retry_failed++;
571                         sta->tx_retry_count += retry_count;
572                 }
573
574                 rate_control_tx_status(local, sband, sta, skb);
575         }
576
577         rcu_read_unlock();
578
579         ieee80211_led_tx(local, 0);
580
581         /* SNMP counters
582          * Fragments are passed to low-level drivers as separate skbs, so these
583          * are actually fragments, not frames. Update frame counters only for
584          * the first fragment of the frame. */
585
586         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
587         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
588
589         if (info->flags & IEEE80211_TX_STAT_ACK) {
590                 if (frag == 0) {
591                         local->dot11TransmittedFrameCount++;
592                         if (is_multicast_ether_addr(hdr->addr1))
593                                 local->dot11MulticastTransmittedFrameCount++;
594                         if (retry_count > 0)
595                                 local->dot11RetryCount++;
596                         if (retry_count > 1)
597                                 local->dot11MultipleRetryCount++;
598                 }
599
600                 /* This counter shall be incremented for an acknowledged MPDU
601                  * with an individual address in the address 1 field or an MPDU
602                  * with a multicast address in the address 1 field of type Data
603                  * or Management. */
604                 if (!is_multicast_ether_addr(hdr->addr1) ||
605                     type == IEEE80211_FTYPE_DATA ||
606                     type == IEEE80211_FTYPE_MGMT)
607                         local->dot11TransmittedFragmentCount++;
608         } else {
609                 if (frag == 0)
610                         local->dot11FailedCount++;
611         }
612
613         /* this was a transmitted frame, but now we want to reuse it */
614         skb_orphan(skb);
615
616         /*
617          * This is a bit racy but we can avoid a lot of work
618          * with this test...
619          */
620         if (!local->monitors && !local->cooked_mntrs) {
621                 dev_kfree_skb(skb);
622                 return;
623         }
624
625         /* send frame to monitor interfaces now */
626
627         if (skb_headroom(skb) < sizeof(*rthdr)) {
628                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
629                 dev_kfree_skb(skb);
630                 return;
631         }
632
633         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
634                                 skb_push(skb, sizeof(*rthdr));
635
636         memset(rthdr, 0, sizeof(*rthdr));
637         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
638         rthdr->hdr.it_present =
639                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
640                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
641                             (1 << IEEE80211_RADIOTAP_RATE));
642
643         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
644             !is_multicast_ether_addr(hdr->addr1))
645                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
646
647         /*
648          * XXX: Once radiotap gets the bitmap reset thing the vendor
649          *      extensions proposal contains, we can actually report
650          *      the whole set of tries we did.
651          */
652         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
653             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
654                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
655         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
656                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
657         if (info->status.rates[0].idx >= 0 &&
658             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
659                 rthdr->rate = sband->bitrates[
660                                 info->status.rates[0].idx].bitrate / 5;
661
662         /* for now report the total retry_count */
663         rthdr->data_retries = retry_count;
664
665         /* XXX: is this sufficient for BPF? */
666         skb_set_mac_header(skb, 0);
667         skb->ip_summed = CHECKSUM_UNNECESSARY;
668         skb->pkt_type = PACKET_OTHERHOST;
669         skb->protocol = htons(ETH_P_802_2);
670         memset(skb->cb, 0, sizeof(skb->cb));
671
672         rcu_read_lock();
673         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
674                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
675                         if (!netif_running(sdata->dev))
676                                 continue;
677
678                         if (prev_dev) {
679                                 skb2 = skb_clone(skb, GFP_ATOMIC);
680                                 if (skb2) {
681                                         skb2->dev = prev_dev;
682                                         netif_rx(skb2);
683                                 }
684                         }
685
686                         prev_dev = sdata->dev;
687                 }
688         }
689         if (prev_dev) {
690                 skb->dev = prev_dev;
691                 netif_rx(skb);
692                 skb = NULL;
693         }
694         rcu_read_unlock();
695         dev_kfree_skb(skb);
696 }
697 EXPORT_SYMBOL(ieee80211_tx_status);
698
699 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
700                                         const struct ieee80211_ops *ops)
701 {
702         struct ieee80211_local *local;
703         int priv_size, i;
704         struct wiphy *wiphy;
705
706         /* Ensure 32-byte alignment of our private data and hw private data.
707          * We use the wiphy priv data for both our ieee80211_local and for
708          * the driver's private data
709          *
710          * In memory it'll be like this:
711          *
712          * +-------------------------+
713          * | struct wiphy           |
714          * +-------------------------+
715          * | struct ieee80211_local  |
716          * +-------------------------+
717          * | driver's private data   |
718          * +-------------------------+
719          *
720          */
721         priv_size = ((sizeof(struct ieee80211_local) +
722                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
723                     priv_data_len;
724
725         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
726
727         if (!wiphy)
728                 return NULL;
729
730         wiphy->privid = mac80211_wiphy_privid;
731         wiphy->max_scan_ssids = 4;
732         /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
733         wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
734                                sizeof(struct cfg80211_bss);
735
736         local = wiphy_priv(wiphy);
737         local->hw.wiphy = wiphy;
738
739         local->hw.priv = (char *)local +
740                          ((sizeof(struct ieee80211_local) +
741                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
742
743         BUG_ON(!ops->tx);
744         BUG_ON(!ops->start);
745         BUG_ON(!ops->stop);
746         BUG_ON(!ops->config);
747         BUG_ON(!ops->add_interface);
748         BUG_ON(!ops->remove_interface);
749         BUG_ON(!ops->configure_filter);
750         local->ops = ops;
751
752         /* set up some defaults */
753         local->hw.queues = 1;
754         local->hw.max_rates = 1;
755         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
756         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
757         local->hw.conf.long_frame_max_tx_count = 4;
758         local->hw.conf.short_frame_max_tx_count = 7;
759         local->hw.conf.radio_enabled = true;
760         local->user_power_level = -1;
761
762         INIT_LIST_HEAD(&local->interfaces);
763         mutex_init(&local->iflist_mtx);
764
765         spin_lock_init(&local->key_lock);
766
767         spin_lock_init(&local->queue_stop_reason_lock);
768
769         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
770
771         INIT_WORK(&local->dynamic_ps_enable_work,
772                   ieee80211_dynamic_ps_enable_work);
773         INIT_WORK(&local->dynamic_ps_disable_work,
774                   ieee80211_dynamic_ps_disable_work);
775         setup_timer(&local->dynamic_ps_timer,
776                     ieee80211_dynamic_ps_timer, (unsigned long) local);
777
778         sta_info_init(local);
779
780         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
781                 skb_queue_head_init(&local->pending[i]);
782         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
783                      (unsigned long)local);
784         tasklet_disable(&local->tx_pending_tasklet);
785
786         tasklet_init(&local->tasklet,
787                      ieee80211_tasklet_handler,
788                      (unsigned long) local);
789         tasklet_disable(&local->tasklet);
790
791         skb_queue_head_init(&local->skb_queue);
792         skb_queue_head_init(&local->skb_queue_unreliable);
793
794         spin_lock_init(&local->ampdu_lock);
795
796         return local_to_hw(local);
797 }
798 EXPORT_SYMBOL(ieee80211_alloc_hw);
799
800 static const struct net_device_ops ieee80211_master_ops = {
801         .ndo_start_xmit = ieee80211_master_start_xmit,
802         .ndo_open = ieee80211_master_open,
803         .ndo_stop = ieee80211_master_stop,
804         .ndo_set_multicast_list = ieee80211_master_set_multicast_list,
805         .ndo_select_queue = ieee80211_select_queue,
806 };
807
808 static void ieee80211_master_setup(struct net_device *mdev)
809 {
810         mdev->type = ARPHRD_IEEE80211;
811         mdev->netdev_ops = &ieee80211_master_ops;
812         mdev->header_ops = &ieee80211_header_ops;
813         mdev->tx_queue_len = 1000;
814         mdev->addr_len = ETH_ALEN;
815 }
816
817 int ieee80211_register_hw(struct ieee80211_hw *hw)
818 {
819         struct ieee80211_local *local = hw_to_local(hw);
820         int result;
821         enum ieee80211_band band;
822         struct net_device *mdev;
823         struct ieee80211_master_priv *mpriv;
824         int channels, i, j;
825
826         /*
827          * generic code guarantees at least one band,
828          * set this very early because much code assumes
829          * that hw.conf.channel is assigned
830          */
831         channels = 0;
832         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
833                 struct ieee80211_supported_band *sband;
834
835                 sband = local->hw.wiphy->bands[band];
836                 if (sband && !local->oper_channel) {
837                         /* init channel we're on */
838                         local->hw.conf.channel =
839                         local->oper_channel =
840                         local->scan_channel = &sband->channels[0];
841                 }
842                 if (sband)
843                         channels += sband->n_channels;
844         }
845
846         local->int_scan_req.n_channels = channels;
847         local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
848         if (!local->int_scan_req.channels)
849                 return -ENOMEM;
850
851         /* if low-level driver supports AP, we also support VLAN */
852         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
853                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
854
855         /* mac80211 always supports monitor */
856         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
857
858         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
859                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
860         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
861                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
862
863         result = wiphy_register(local->hw.wiphy);
864         if (result < 0)
865                 goto fail_wiphy_register;
866
867         /*
868          * We use the number of queues for feature tests (QoS, HT) internally
869          * so restrict them appropriately.
870          */
871         if (hw->queues > IEEE80211_MAX_QUEUES)
872                 hw->queues = IEEE80211_MAX_QUEUES;
873
874         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
875                                "wmaster%d", ieee80211_master_setup,
876                                hw->queues);
877         if (!mdev)
878                 goto fail_mdev_alloc;
879
880         mpriv = netdev_priv(mdev);
881         mpriv->local = local;
882         local->mdev = mdev;
883
884         local->hw.workqueue =
885                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
886         if (!local->hw.workqueue) {
887                 result = -ENOMEM;
888                 goto fail_workqueue;
889         }
890
891         /*
892          * The hardware needs headroom for sending the frame,
893          * and we need some headroom for passing the frame to monitor
894          * interfaces, but never both at the same time.
895          */
896         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
897                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
898
899         debugfs_hw_add(local);
900
901         if (local->hw.conf.beacon_int < 10)
902                 local->hw.conf.beacon_int = 100;
903
904         if (local->hw.max_listen_interval == 0)
905                 local->hw.max_listen_interval = 1;
906
907         local->hw.conf.listen_interval = local->hw.max_listen_interval;
908
909         result = sta_info_start(local);
910         if (result < 0)
911                 goto fail_sta_info;
912
913         result = ieee80211_wep_init(local);
914         if (result < 0) {
915                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
916                        wiphy_name(local->hw.wiphy), result);
917                 goto fail_wep;
918         }
919
920         rtnl_lock();
921         result = dev_alloc_name(local->mdev, local->mdev->name);
922         if (result < 0)
923                 goto fail_dev;
924
925         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
926         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
927         local->mdev->features |= NETIF_F_NETNS_LOCAL;
928
929         result = register_netdevice(local->mdev);
930         if (result < 0)
931                 goto fail_dev;
932
933         result = ieee80211_init_rate_ctrl_alg(local,
934                                               hw->rate_control_algorithm);
935         if (result < 0) {
936                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
937                        "algorithm\n", wiphy_name(local->hw.wiphy));
938                 goto fail_rate;
939         }
940
941         /* add one default STA interface if supported */
942         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
943                 result = ieee80211_if_add(local, "wlan%d", NULL,
944                                           NL80211_IFTYPE_STATION, NULL);
945                 if (result)
946                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
947                                wiphy_name(local->hw.wiphy));
948         }
949
950         rtnl_unlock();
951
952         ieee80211_led_init(local);
953
954         /* alloc internal scan request */
955         i = 0;
956         local->int_scan_req.ssids = &local->scan_ssid;
957         local->int_scan_req.n_ssids = 1;
958         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
959                 if (!hw->wiphy->bands[band])
960                         continue;
961                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
962                         local->int_scan_req.channels[i] =
963                                 &hw->wiphy->bands[band]->channels[j];
964                         i++;
965                 }
966         }
967
968         return 0;
969
970 fail_rate:
971         unregister_netdevice(local->mdev);
972         local->mdev = NULL;
973 fail_dev:
974         rtnl_unlock();
975         ieee80211_wep_free(local);
976 fail_wep:
977         sta_info_stop(local);
978 fail_sta_info:
979         debugfs_hw_del(local);
980         destroy_workqueue(local->hw.workqueue);
981 fail_workqueue:
982         if (local->mdev)
983                 free_netdev(local->mdev);
984 fail_mdev_alloc:
985         wiphy_unregister(local->hw.wiphy);
986 fail_wiphy_register:
987         kfree(local->int_scan_req.channels);
988         return result;
989 }
990 EXPORT_SYMBOL(ieee80211_register_hw);
991
992 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
993 {
994         struct ieee80211_local *local = hw_to_local(hw);
995
996         tasklet_kill(&local->tx_pending_tasklet);
997         tasklet_kill(&local->tasklet);
998
999         rtnl_lock();
1000
1001         /*
1002          * At this point, interface list manipulations are fine
1003          * because the driver cannot be handing us frames any
1004          * more and the tasklet is killed.
1005          */
1006
1007         /* First, we remove all virtual interfaces. */
1008         ieee80211_remove_interfaces(local);
1009
1010         /* then, finally, remove the master interface */
1011         unregister_netdevice(local->mdev);
1012
1013         rtnl_unlock();
1014
1015         ieee80211_clear_tx_pending(local);
1016         sta_info_stop(local);
1017         rate_control_deinitialize(local);
1018         debugfs_hw_del(local);
1019
1020         if (skb_queue_len(&local->skb_queue)
1021                         || skb_queue_len(&local->skb_queue_unreliable))
1022                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1023                        wiphy_name(local->hw.wiphy));
1024         skb_queue_purge(&local->skb_queue);
1025         skb_queue_purge(&local->skb_queue_unreliable);
1026
1027         destroy_workqueue(local->hw.workqueue);
1028         wiphy_unregister(local->hw.wiphy);
1029         ieee80211_wep_free(local);
1030         ieee80211_led_exit(local);
1031         free_netdev(local->mdev);
1032         kfree(local->int_scan_req.channels);
1033 }
1034 EXPORT_SYMBOL(ieee80211_unregister_hw);
1035
1036 void ieee80211_free_hw(struct ieee80211_hw *hw)
1037 {
1038         struct ieee80211_local *local = hw_to_local(hw);
1039
1040         mutex_destroy(&local->iflist_mtx);
1041
1042         wiphy_free(local->hw.wiphy);
1043 }
1044 EXPORT_SYMBOL(ieee80211_free_hw);
1045
1046 static int __init ieee80211_init(void)
1047 {
1048         struct sk_buff *skb;
1049         int ret;
1050
1051         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1052         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1053                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1054
1055         ret = rc80211_minstrel_init();
1056         if (ret)
1057                 return ret;
1058
1059         ret = rc80211_pid_init();
1060         if (ret)
1061                 return ret;
1062
1063         ieee80211_debugfs_netdev_init();
1064
1065         return 0;
1066 }
1067
1068 static void __exit ieee80211_exit(void)
1069 {
1070         rc80211_pid_exit();
1071         rc80211_minstrel_exit();
1072
1073         /*
1074          * For key todo, it'll be empty by now but the work
1075          * might still be scheduled.
1076          */
1077         flush_scheduled_work();
1078
1079         if (mesh_allocated)
1080                 ieee80211s_stop();
1081
1082         ieee80211_debugfs_netdev_exit();
1083 }
1084
1085
1086 subsys_initcall(ieee80211_init);
1087 module_exit(ieee80211_exit);
1088
1089 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1090 MODULE_LICENSE("GPL");