Merge branch 'for-2.6.28' of git://linux-nfs.org/~bfields/linux
[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         __le16 tx_flags;
45         u8 data_retries;
46 } __attribute__ ((packed));
47
48
49 /* must be called under mdev tx lock */
50 void ieee80211_configure_filter(struct ieee80211_local *local)
51 {
52         unsigned int changed_flags;
53         unsigned int new_flags = 0;
54
55         if (atomic_read(&local->iff_promiscs))
56                 new_flags |= FIF_PROMISC_IN_BSS;
57
58         if (atomic_read(&local->iff_allmultis))
59                 new_flags |= FIF_ALLMULTI;
60
61         if (local->monitors)
62                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
63
64         if (local->fif_fcsfail)
65                 new_flags |= FIF_FCSFAIL;
66
67         if (local->fif_plcpfail)
68                 new_flags |= FIF_PLCPFAIL;
69
70         if (local->fif_control)
71                 new_flags |= FIF_CONTROL;
72
73         if (local->fif_other_bss)
74                 new_flags |= FIF_OTHER_BSS;
75
76         changed_flags = local->filter_flags ^ new_flags;
77
78         /* be a bit nasty */
79         new_flags |= (1<<31);
80
81         local->ops->configure_filter(local_to_hw(local),
82                                      changed_flags, &new_flags,
83                                      local->mdev->mc_count,
84                                      local->mdev->mc_list);
85
86         WARN_ON(new_flags & (1<<31));
87
88         local->filter_flags = new_flags & ~(1<<31);
89 }
90
91 /* master interface */
92
93 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
94 {
95         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
96         return ETH_ALEN;
97 }
98
99 static const struct header_ops ieee80211_header_ops = {
100         .create         = eth_header,
101         .parse          = header_parse_80211,
102         .rebuild        = eth_rebuild_header,
103         .cache          = eth_header_cache,
104         .cache_update   = eth_header_cache_update,
105 };
106
107 static int ieee80211_master_open(struct net_device *dev)
108 {
109         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
110         struct ieee80211_local *local = mpriv->local;
111         struct ieee80211_sub_if_data *sdata;
112         int res = -EOPNOTSUPP;
113
114         /* we hold the RTNL here so can safely walk the list */
115         list_for_each_entry(sdata, &local->interfaces, list) {
116                 if (netif_running(sdata->dev)) {
117                         res = 0;
118                         break;
119                 }
120         }
121
122         if (res)
123                 return res;
124
125         netif_tx_start_all_queues(local->mdev);
126
127         return 0;
128 }
129
130 static int ieee80211_master_stop(struct net_device *dev)
131 {
132         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
133         struct ieee80211_local *local = mpriv->local;
134         struct ieee80211_sub_if_data *sdata;
135
136         /* we hold the RTNL here so can safely walk the list */
137         list_for_each_entry(sdata, &local->interfaces, list)
138                 if (netif_running(sdata->dev))
139                         dev_close(sdata->dev);
140
141         return 0;
142 }
143
144 static void ieee80211_master_set_multicast_list(struct net_device *dev)
145 {
146         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
147         struct ieee80211_local *local = mpriv->local;
148
149         ieee80211_configure_filter(local);
150 }
151
152 /* everything else */
153
154 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
155 {
156         struct ieee80211_local *local = sdata->local;
157         struct ieee80211_if_conf conf;
158
159         if (WARN_ON(!netif_running(sdata->dev)))
160                 return 0;
161
162         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
163                 return -EINVAL;
164
165         if (!local->ops->config_interface)
166                 return 0;
167
168         memset(&conf, 0, sizeof(conf));
169         conf.changed = changed;
170
171         if (sdata->vif.type == NL80211_IFTYPE_STATION ||
172             sdata->vif.type == NL80211_IFTYPE_ADHOC) {
173                 conf.bssid = sdata->u.sta.bssid;
174                 conf.ssid = sdata->u.sta.ssid;
175                 conf.ssid_len = sdata->u.sta.ssid_len;
176         } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
177                 conf.bssid = sdata->dev->dev_addr;
178                 conf.ssid = sdata->u.ap.ssid;
179                 conf.ssid_len = sdata->u.ap.ssid_len;
180         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
181                 u8 zero[ETH_ALEN] = { 0 };
182                 conf.bssid = zero;
183                 conf.ssid = zero;
184                 conf.ssid_len = 0;
185         } else {
186                 WARN_ON(1);
187                 return -EINVAL;
188         }
189
190         if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
191                 return -EINVAL;
192
193         if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID)))
194                 return -EINVAL;
195
196         return local->ops->config_interface(local_to_hw(local),
197                                             &sdata->vif, &conf);
198 }
199
200 int ieee80211_hw_config(struct ieee80211_local *local)
201 {
202         struct ieee80211_channel *chan;
203         int ret = 0;
204
205         if (local->sw_scanning)
206                 chan = local->scan_channel;
207         else
208                 chan = local->oper_channel;
209
210         local->hw.conf.channel = chan;
211
212         if (!local->hw.conf.power_level)
213                 local->hw.conf.power_level = chan->max_power;
214         else
215                 local->hw.conf.power_level = min(chan->max_power,
216                                                local->hw.conf.power_level);
217
218         local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
219
220 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
221         printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
222                wiphy_name(local->hw.wiphy), chan->center_freq);
223 #endif
224
225         if (local->open_count)
226                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
227
228         return ret;
229 }
230
231 /**
232  * ieee80211_handle_ht should be used only after legacy configuration
233  * has been determined namely band, as ht configuration depends upon
234  * the hardware's HT abilities for a _specific_ band.
235  */
236 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
237                            struct ieee80211_ht_info *req_ht_cap,
238                            struct ieee80211_ht_bss_info *req_bss_cap)
239 {
240         struct ieee80211_conf *conf = &local->hw.conf;
241         struct ieee80211_supported_band *sband;
242         struct ieee80211_ht_info ht_conf;
243         struct ieee80211_ht_bss_info ht_bss_conf;
244         u32 changed = 0;
245         int i;
246         u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
247         u8 tx_mcs_set_cap;
248
249         sband = local->hw.wiphy->bands[conf->channel->band];
250
251         memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
252         memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
253
254         /* HT is not supported */
255         if (!sband->ht_info.ht_supported) {
256                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
257                 goto out;
258         }
259
260         /* disable HT */
261         if (!enable_ht) {
262                 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
263                         changed |= BSS_CHANGED_HT;
264                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
265                 conf->ht_conf.ht_supported = 0;
266                 goto out;
267         }
268
269
270         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
271                 changed |= BSS_CHANGED_HT;
272
273         conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
274         ht_conf.ht_supported = 1;
275
276         ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
277         ht_conf.cap &= ~(IEEE80211_HT_CAP_SM_PS);
278         ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_SM_PS;
279         ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
280         ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
281         ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
282
283         ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
284         ht_conf.ampdu_density = req_ht_cap->ampdu_density;
285
286         /* Bits 96-100 */
287         tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
288
289         /* configure suppoerted Tx MCS according to requested MCS
290          * (based in most cases on Rx capabilities of peer) and self
291          * Tx MCS capabilities (as defined by low level driver HW
292          * Tx capabilities) */
293         if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
294                 goto check_changed;
295
296         /* Counting from 0 therfore + 1 */
297         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
298                 max_tx_streams = ((tx_mcs_set_cap &
299                                 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
300
301         for (i = 0; i < max_tx_streams; i++)
302                 ht_conf.supp_mcs_set[i] =
303                         sband->ht_info.supp_mcs_set[i] &
304                                         req_ht_cap->supp_mcs_set[i];
305
306         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
307                 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
308                      i < IEEE80211_SUPP_MCS_SET_LEN; i++)
309                         ht_conf.supp_mcs_set[i] =
310                                 sband->ht_info.supp_mcs_set[i] &
311                                         req_ht_cap->supp_mcs_set[i];
312
313 check_changed:
314         /* if bss configuration changed store the new one */
315         if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
316             memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
317                 changed |= BSS_CHANGED_HT;
318                 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
319                 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
320         }
321 out:
322         return changed;
323 }
324
325 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
326                                       u32 changed)
327 {
328         struct ieee80211_local *local = sdata->local;
329
330         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
331                 return;
332
333         if (!changed)
334                 return;
335
336         if (local->ops->bss_info_changed)
337                 local->ops->bss_info_changed(local_to_hw(local),
338                                              &sdata->vif,
339                                              &sdata->bss_conf,
340                                              changed);
341 }
342
343 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
344 {
345         sdata->bss_conf.use_cts_prot = 0;
346         sdata->bss_conf.use_short_preamble = 0;
347         return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE;
348 }
349
350 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
351                                  struct sk_buff *skb)
352 {
353         struct ieee80211_local *local = hw_to_local(hw);
354         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
355         int tmp;
356
357         skb->dev = local->mdev;
358         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
359         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
360                        &local->skb_queue : &local->skb_queue_unreliable, skb);
361         tmp = skb_queue_len(&local->skb_queue) +
362                 skb_queue_len(&local->skb_queue_unreliable);
363         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
364                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
365                 dev_kfree_skb_irq(skb);
366                 tmp--;
367                 I802_DEBUG_INC(local->tx_status_drop);
368         }
369         tasklet_schedule(&local->tasklet);
370 }
371 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
372
373 static void ieee80211_tasklet_handler(unsigned long data)
374 {
375         struct ieee80211_local *local = (struct ieee80211_local *) data;
376         struct sk_buff *skb;
377         struct ieee80211_rx_status rx_status;
378         struct ieee80211_ra_tid *ra_tid;
379
380         while ((skb = skb_dequeue(&local->skb_queue)) ||
381                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
382                 switch (skb->pkt_type) {
383                 case IEEE80211_RX_MSG:
384                         /* status is in skb->cb */
385                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
386                         /* Clear skb->pkt_type in order to not confuse kernel
387                          * netstack. */
388                         skb->pkt_type = 0;
389                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
390                         break;
391                 case IEEE80211_TX_STATUS_MSG:
392                         skb->pkt_type = 0;
393                         ieee80211_tx_status(local_to_hw(local), skb);
394                         break;
395                 case IEEE80211_DELBA_MSG:
396                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
397                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
398                                                 ra_tid->ra, ra_tid->tid);
399                         dev_kfree_skb(skb);
400                         break;
401                 case IEEE80211_ADDBA_MSG:
402                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
403                         ieee80211_start_tx_ba_cb(local_to_hw(local),
404                                                  ra_tid->ra, ra_tid->tid);
405                         dev_kfree_skb(skb);
406                         break ;
407                 default:
408                         WARN_ON(1);
409                         dev_kfree_skb(skb);
410                         break;
411                 }
412         }
413 }
414
415 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
416  * make a prepared TX frame (one that has been given to hw) to look like brand
417  * new IEEE 802.11 frame that is ready to go through TX processing again.
418  */
419 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
420                                       struct ieee80211_key *key,
421                                       struct sk_buff *skb)
422 {
423         unsigned int hdrlen, iv_len, mic_len;
424         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
425
426         hdrlen = ieee80211_hdrlen(hdr->frame_control);
427
428         if (!key)
429                 goto no_key;
430
431         switch (key->conf.alg) {
432         case ALG_WEP:
433                 iv_len = WEP_IV_LEN;
434                 mic_len = WEP_ICV_LEN;
435                 break;
436         case ALG_TKIP:
437                 iv_len = TKIP_IV_LEN;
438                 mic_len = TKIP_ICV_LEN;
439                 break;
440         case ALG_CCMP:
441                 iv_len = CCMP_HDR_LEN;
442                 mic_len = CCMP_MIC_LEN;
443                 break;
444         default:
445                 goto no_key;
446         }
447
448         if (skb->len >= hdrlen + mic_len &&
449             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
450                 skb_trim(skb, skb->len - mic_len);
451         if (skb->len >= hdrlen + iv_len) {
452                 memmove(skb->data + iv_len, skb->data, hdrlen);
453                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
454         }
455
456 no_key:
457         if (ieee80211_is_data_qos(hdr->frame_control)) {
458                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
459                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
460                         hdrlen - IEEE80211_QOS_CTL_LEN);
461                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
462         }
463 }
464
465 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
466                                             struct sta_info *sta,
467                                             struct sk_buff *skb)
468 {
469         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
470
471         sta->tx_filtered_count++;
472
473         /*
474          * Clear the TX filter mask for this STA when sending the next
475          * packet. If the STA went to power save mode, this will happen
476          * when it wakes up for the next time.
477          */
478         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
479
480         /*
481          * This code races in the following way:
482          *
483          *  (1) STA sends frame indicating it will go to sleep and does so
484          *  (2) hardware/firmware adds STA to filter list, passes frame up
485          *  (3) hardware/firmware processes TX fifo and suppresses a frame
486          *  (4) we get TX status before having processed the frame and
487          *      knowing that the STA has gone to sleep.
488          *
489          * This is actually quite unlikely even when both those events are
490          * processed from interrupts coming in quickly after one another or
491          * even at the same time because we queue both TX status events and
492          * RX frames to be processed by a tasklet and process them in the
493          * same order that they were received or TX status last. Hence, there
494          * is no race as long as the frame RX is processed before the next TX
495          * status, which drivers can ensure, see below.
496          *
497          * Note that this can only happen if the hardware or firmware can
498          * actually add STAs to the filter list, if this is done by the
499          * driver in response to set_tim() (which will only reduce the race
500          * this whole filtering tries to solve, not completely solve it)
501          * this situation cannot happen.
502          *
503          * To completely solve this race drivers need to make sure that they
504          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
505          *      functions and
506          *  (b) always process RX events before TX status events if ordering
507          *      can be unknown, for example with different interrupt status
508          *      bits.
509          */
510         if (test_sta_flags(sta, WLAN_STA_PS) &&
511             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
512                 ieee80211_remove_tx_extra(local, sta->key, skb);
513                 skb_queue_tail(&sta->tx_filtered, skb);
514                 return;
515         }
516
517         if (!test_sta_flags(sta, WLAN_STA_PS) &&
518             !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
519                 /* Software retry the packet once */
520                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
521                 ieee80211_remove_tx_extra(local, sta->key, skb);
522                 dev_queue_xmit(skb);
523                 return;
524         }
525
526 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
527         if (net_ratelimit())
528                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
529                        "queue_len=%d PS=%d @%lu\n",
530                        wiphy_name(local->hw.wiphy),
531                        skb_queue_len(&sta->tx_filtered),
532                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
533 #endif
534         dev_kfree_skb(skb);
535 }
536
537 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
538 {
539         struct sk_buff *skb2;
540         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
541         struct ieee80211_local *local = hw_to_local(hw);
542         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
543         u16 frag, type;
544         __le16 fc;
545         struct ieee80211_supported_band *sband;
546         struct ieee80211_tx_status_rtap_hdr *rthdr;
547         struct ieee80211_sub_if_data *sdata;
548         struct net_device *prev_dev = NULL;
549         struct sta_info *sta;
550
551         rcu_read_lock();
552
553         sta = sta_info_get(local, hdr->addr1);
554
555         if (sta) {
556                 if (info->status.excessive_retries &&
557                     test_sta_flags(sta, WLAN_STA_PS)) {
558                         /*
559                          * The STA is in power save mode, so assume
560                          * that this TX packet failed because of that.
561                          */
562                         ieee80211_handle_filtered_frame(local, sta, skb);
563                         rcu_read_unlock();
564                         return;
565                 }
566
567                 fc = hdr->frame_control;
568
569                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
570                     (ieee80211_is_data_qos(fc))) {
571                         u16 tid, ssn;
572                         u8 *qc;
573
574                         qc = ieee80211_get_qos_ctl(hdr);
575                         tid = qc[0] & 0xf;
576                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
577                                                 & IEEE80211_SCTL_SEQ);
578                         ieee80211_send_bar(sta->sdata, hdr->addr1,
579                                            tid, ssn);
580                 }
581
582                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
583                         ieee80211_handle_filtered_frame(local, sta, skb);
584                         rcu_read_unlock();
585                         return;
586                 } else {
587                         if (info->status.excessive_retries)
588                                 sta->tx_retry_failed++;
589                         sta->tx_retry_count += info->status.retry_count;
590                 }
591
592                 sband = local->hw.wiphy->bands[info->band];
593                 rate_control_tx_status(local, sband, sta, skb);
594         }
595
596         rcu_read_unlock();
597
598         ieee80211_led_tx(local, 0);
599
600         /* SNMP counters
601          * Fragments are passed to low-level drivers as separate skbs, so these
602          * are actually fragments, not frames. Update frame counters only for
603          * the first fragment of the frame. */
604
605         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
606         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
607
608         if (info->flags & IEEE80211_TX_STAT_ACK) {
609                 if (frag == 0) {
610                         local->dot11TransmittedFrameCount++;
611                         if (is_multicast_ether_addr(hdr->addr1))
612                                 local->dot11MulticastTransmittedFrameCount++;
613                         if (info->status.retry_count > 0)
614                                 local->dot11RetryCount++;
615                         if (info->status.retry_count > 1)
616                                 local->dot11MultipleRetryCount++;
617                 }
618
619                 /* This counter shall be incremented for an acknowledged MPDU
620                  * with an individual address in the address 1 field or an MPDU
621                  * with a multicast address in the address 1 field of type Data
622                  * or Management. */
623                 if (!is_multicast_ether_addr(hdr->addr1) ||
624                     type == IEEE80211_FTYPE_DATA ||
625                     type == IEEE80211_FTYPE_MGMT)
626                         local->dot11TransmittedFragmentCount++;
627         } else {
628                 if (frag == 0)
629                         local->dot11FailedCount++;
630         }
631
632         /* this was a transmitted frame, but now we want to reuse it */
633         skb_orphan(skb);
634
635         /*
636          * This is a bit racy but we can avoid a lot of work
637          * with this test...
638          */
639         if (!local->monitors && !local->cooked_mntrs) {
640                 dev_kfree_skb(skb);
641                 return;
642         }
643
644         /* send frame to monitor interfaces now */
645
646         if (skb_headroom(skb) < sizeof(*rthdr)) {
647                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
648                 dev_kfree_skb(skb);
649                 return;
650         }
651
652         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
653                                 skb_push(skb, sizeof(*rthdr));
654
655         memset(rthdr, 0, sizeof(*rthdr));
656         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
657         rthdr->hdr.it_present =
658                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
659                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
660
661         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
662             !is_multicast_ether_addr(hdr->addr1))
663                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
664
665         if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
666             (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
667                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
668         else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
669                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
670
671         rthdr->data_retries = info->status.retry_count;
672
673         /* XXX: is this sufficient for BPF? */
674         skb_set_mac_header(skb, 0);
675         skb->ip_summed = CHECKSUM_UNNECESSARY;
676         skb->pkt_type = PACKET_OTHERHOST;
677         skb->protocol = htons(ETH_P_802_2);
678         memset(skb->cb, 0, sizeof(skb->cb));
679
680         rcu_read_lock();
681         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
682                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
683                         if (!netif_running(sdata->dev))
684                                 continue;
685
686                         if (prev_dev) {
687                                 skb2 = skb_clone(skb, GFP_ATOMIC);
688                                 if (skb2) {
689                                         skb2->dev = prev_dev;
690                                         netif_rx(skb2);
691                                 }
692                         }
693
694                         prev_dev = sdata->dev;
695                 }
696         }
697         if (prev_dev) {
698                 skb->dev = prev_dev;
699                 netif_rx(skb);
700                 skb = NULL;
701         }
702         rcu_read_unlock();
703         dev_kfree_skb(skb);
704 }
705 EXPORT_SYMBOL(ieee80211_tx_status);
706
707 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
708                                         const struct ieee80211_ops *ops)
709 {
710         struct ieee80211_local *local;
711         int priv_size;
712         struct wiphy *wiphy;
713
714         /* Ensure 32-byte alignment of our private data and hw private data.
715          * We use the wiphy priv data for both our ieee80211_local and for
716          * the driver's private data
717          *
718          * In memory it'll be like this:
719          *
720          * +-------------------------+
721          * | struct wiphy           |
722          * +-------------------------+
723          * | struct ieee80211_local  |
724          * +-------------------------+
725          * | driver's private data   |
726          * +-------------------------+
727          *
728          */
729         priv_size = ((sizeof(struct ieee80211_local) +
730                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
731                     priv_data_len;
732
733         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
734
735         if (!wiphy)
736                 return NULL;
737
738         wiphy->privid = mac80211_wiphy_privid;
739
740         local = wiphy_priv(wiphy);
741         local->hw.wiphy = wiphy;
742
743         local->hw.priv = (char *)local +
744                          ((sizeof(struct ieee80211_local) +
745                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
746
747         BUG_ON(!ops->tx);
748         BUG_ON(!ops->start);
749         BUG_ON(!ops->stop);
750         BUG_ON(!ops->config);
751         BUG_ON(!ops->add_interface);
752         BUG_ON(!ops->remove_interface);
753         BUG_ON(!ops->configure_filter);
754         local->ops = ops;
755
756         local->hw.queues = 1; /* default */
757
758         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
759         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
760         local->short_retry_limit = 7;
761         local->long_retry_limit = 4;
762         local->hw.conf.radio_enabled = 1;
763
764         INIT_LIST_HEAD(&local->interfaces);
765
766         spin_lock_init(&local->key_lock);
767
768         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
769
770         sta_info_init(local);
771
772         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
773                      (unsigned long)local);
774         tasklet_disable(&local->tx_pending_tasklet);
775
776         tasklet_init(&local->tasklet,
777                      ieee80211_tasklet_handler,
778                      (unsigned long) local);
779         tasklet_disable(&local->tasklet);
780
781         skb_queue_head_init(&local->skb_queue);
782         skb_queue_head_init(&local->skb_queue_unreliable);
783
784         return local_to_hw(local);
785 }
786 EXPORT_SYMBOL(ieee80211_alloc_hw);
787
788 int ieee80211_register_hw(struct ieee80211_hw *hw)
789 {
790         struct ieee80211_local *local = hw_to_local(hw);
791         const char *name;
792         int result;
793         enum ieee80211_band band;
794         struct net_device *mdev;
795         struct ieee80211_master_priv *mpriv;
796
797         /*
798          * generic code guarantees at least one band,
799          * set this very early because much code assumes
800          * that hw.conf.channel is assigned
801          */
802         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
803                 struct ieee80211_supported_band *sband;
804
805                 sband = local->hw.wiphy->bands[band];
806                 if (sband) {
807                         /* init channel we're on */
808                         local->hw.conf.channel =
809                         local->oper_channel =
810                         local->scan_channel = &sband->channels[0];
811                         break;
812                 }
813         }
814
815         /* if low-level driver supports AP, we also support VLAN */
816         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
817                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
818
819         /* mac80211 always supports monitor */
820         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
821
822         result = wiphy_register(local->hw.wiphy);
823         if (result < 0)
824                 return result;
825
826         /*
827          * We use the number of queues for feature tests (QoS, HT) internally
828          * so restrict them appropriately.
829          */
830         if (hw->queues > IEEE80211_MAX_QUEUES)
831                 hw->queues = IEEE80211_MAX_QUEUES;
832         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
833                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
834         if (hw->queues < 4)
835                 hw->ampdu_queues = 0;
836
837         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
838                                "wmaster%d", ether_setup,
839                                ieee80211_num_queues(hw));
840         if (!mdev)
841                 goto fail_mdev_alloc;
842
843         mpriv = netdev_priv(mdev);
844         mpriv->local = local;
845         local->mdev = mdev;
846
847         ieee80211_rx_bss_list_init(local);
848
849         mdev->hard_start_xmit = ieee80211_master_start_xmit;
850         mdev->open = ieee80211_master_open;
851         mdev->stop = ieee80211_master_stop;
852         mdev->type = ARPHRD_IEEE80211;
853         mdev->header_ops = &ieee80211_header_ops;
854         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
855
856         name = wiphy_dev(local->hw.wiphy)->driver->name;
857         local->hw.workqueue = create_freezeable_workqueue(name);
858         if (!local->hw.workqueue) {
859                 result = -ENOMEM;
860                 goto fail_workqueue;
861         }
862
863         /*
864          * The hardware needs headroom for sending the frame,
865          * and we need some headroom for passing the frame to monitor
866          * interfaces, but never both at the same time.
867          */
868         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
869                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
870
871         debugfs_hw_add(local);
872
873         if (local->hw.conf.beacon_int < 10)
874                 local->hw.conf.beacon_int = 100;
875
876         if (local->hw.max_listen_interval == 0)
877                 local->hw.max_listen_interval = 1;
878
879         local->hw.conf.listen_interval = local->hw.max_listen_interval;
880
881         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
882                                                   IEEE80211_HW_SIGNAL_DB |
883                                                   IEEE80211_HW_SIGNAL_DBM) ?
884                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
885         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
886                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
887         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
888                 local->wstats_flags |= IW_QUAL_DBM;
889
890         result = sta_info_start(local);
891         if (result < 0)
892                 goto fail_sta_info;
893
894         rtnl_lock();
895         result = dev_alloc_name(local->mdev, local->mdev->name);
896         if (result < 0)
897                 goto fail_dev;
898
899         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
900         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
901
902         result = register_netdevice(local->mdev);
903         if (result < 0)
904                 goto fail_dev;
905
906         result = ieee80211_init_rate_ctrl_alg(local,
907                                               hw->rate_control_algorithm);
908         if (result < 0) {
909                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
910                        "algorithm\n", wiphy_name(local->hw.wiphy));
911                 goto fail_rate;
912         }
913
914         result = ieee80211_wep_init(local);
915
916         if (result < 0) {
917                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
918                        wiphy_name(local->hw.wiphy), result);
919                 goto fail_wep;
920         }
921
922         local->mdev->select_queue = ieee80211_select_queue;
923
924         /* add one default STA interface */
925         result = ieee80211_if_add(local, "wlan%d", NULL,
926                                   NL80211_IFTYPE_STATION, NULL);
927         if (result)
928                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
929                        wiphy_name(local->hw.wiphy));
930
931         rtnl_unlock();
932
933         ieee80211_led_init(local);
934
935         return 0;
936
937 fail_wep:
938         rate_control_deinitialize(local);
939 fail_rate:
940         unregister_netdevice(local->mdev);
941         local->mdev = NULL;
942 fail_dev:
943         rtnl_unlock();
944         sta_info_stop(local);
945 fail_sta_info:
946         debugfs_hw_del(local);
947         destroy_workqueue(local->hw.workqueue);
948 fail_workqueue:
949         if (local->mdev)
950                 free_netdev(local->mdev);
951 fail_mdev_alloc:
952         wiphy_unregister(local->hw.wiphy);
953         return result;
954 }
955 EXPORT_SYMBOL(ieee80211_register_hw);
956
957 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
958 {
959         struct ieee80211_local *local = hw_to_local(hw);
960
961         tasklet_kill(&local->tx_pending_tasklet);
962         tasklet_kill(&local->tasklet);
963
964         rtnl_lock();
965
966         /*
967          * At this point, interface list manipulations are fine
968          * because the driver cannot be handing us frames any
969          * more and the tasklet is killed.
970          */
971
972         /* First, we remove all virtual interfaces. */
973         ieee80211_remove_interfaces(local);
974
975         /* then, finally, remove the master interface */
976         unregister_netdevice(local->mdev);
977
978         rtnl_unlock();
979
980         ieee80211_rx_bss_list_deinit(local);
981         ieee80211_clear_tx_pending(local);
982         sta_info_stop(local);
983         rate_control_deinitialize(local);
984         debugfs_hw_del(local);
985
986         if (skb_queue_len(&local->skb_queue)
987                         || skb_queue_len(&local->skb_queue_unreliable))
988                 printk(KERN_WARNING "%s: skb_queue not empty\n",
989                        wiphy_name(local->hw.wiphy));
990         skb_queue_purge(&local->skb_queue);
991         skb_queue_purge(&local->skb_queue_unreliable);
992
993         destroy_workqueue(local->hw.workqueue);
994         wiphy_unregister(local->hw.wiphy);
995         ieee80211_wep_free(local);
996         ieee80211_led_exit(local);
997         free_netdev(local->mdev);
998 }
999 EXPORT_SYMBOL(ieee80211_unregister_hw);
1000
1001 void ieee80211_free_hw(struct ieee80211_hw *hw)
1002 {
1003         struct ieee80211_local *local = hw_to_local(hw);
1004
1005         wiphy_free(local->hw.wiphy);
1006 }
1007 EXPORT_SYMBOL(ieee80211_free_hw);
1008
1009 static int __init ieee80211_init(void)
1010 {
1011         struct sk_buff *skb;
1012         int ret;
1013
1014         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1015         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1016                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1017
1018         ret = rc80211_minstrel_init();
1019         if (ret)
1020                 return ret;
1021
1022         ret = rc80211_pid_init();
1023         if (ret)
1024                 return ret;
1025
1026         ieee80211_debugfs_netdev_init();
1027
1028         return 0;
1029 }
1030
1031 static void __exit ieee80211_exit(void)
1032 {
1033         rc80211_pid_exit();
1034         rc80211_minstrel_exit();
1035
1036         /*
1037          * For key todo, it'll be empty by now but the work
1038          * might still be scheduled.
1039          */
1040         flush_scheduled_work();
1041
1042         if (mesh_allocated)
1043                 ieee80211s_stop();
1044
1045         ieee80211_debugfs_netdev_exit();
1046 }
1047
1048
1049 subsys_initcall(ieee80211_init);
1050 module_exit(ieee80211_exit);
1051
1052 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1053 MODULE_LICENSE("GPL");