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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         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
165                 return -EINVAL;
166
167         if (!local->ops->config_interface)
168                 return 0;
169
170         memset(&conf, 0, sizeof(conf));
171         conf.changed = changed;
172
173         if (sdata->vif.type == NL80211_IFTYPE_STATION ||
174             sdata->vif.type == NL80211_IFTYPE_ADHOC)
175                 conf.bssid = sdata->u.sta.bssid;
176         else if (sdata->vif.type == NL80211_IFTYPE_AP)
177                 conf.bssid = sdata->dev->dev_addr;
178         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
179                 u8 zero[ETH_ALEN] = { 0 };
180                 conf.bssid = zero;
181         } else {
182                 WARN_ON(1);
183                 return -EINVAL;
184         }
185
186         if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
187                 return -EINVAL;
188
189         return local->ops->config_interface(local_to_hw(local),
190                                             &sdata->vif, &conf);
191 }
192
193 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
194 {
195         struct ieee80211_channel *chan;
196         int ret = 0;
197         int power;
198         enum nl80211_channel_type channel_type;
199
200         might_sleep();
201
202         if (local->sw_scanning) {
203                 chan = local->scan_channel;
204                 channel_type = NL80211_CHAN_NO_HT;
205         } else {
206                 chan = local->oper_channel;
207                 channel_type = local->oper_channel_type;
208         }
209
210         if (chan != local->hw.conf.channel ||
211             channel_type != local->hw.conf.ht.channel_type) {
212                 local->hw.conf.channel = chan;
213                 local->hw.conf.ht.channel_type = channel_type;
214                 switch (channel_type) {
215                 case NL80211_CHAN_NO_HT:
216                         local->hw.conf.ht.enabled = false;
217                         break;
218                 case NL80211_CHAN_HT20:
219                 case NL80211_CHAN_HT40MINUS:
220                 case NL80211_CHAN_HT40PLUS:
221                         local->hw.conf.ht.enabled = true;
222                         break;
223                 }
224                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
225         }
226
227         if (!local->hw.conf.power_level)
228                 power = chan->max_power;
229         else
230                 power = min(chan->max_power, local->hw.conf.power_level);
231         if (local->hw.conf.power_level != power) {
232                 changed |= IEEE80211_CONF_CHANGE_POWER;
233                 local->hw.conf.power_level = power;
234         }
235
236         if (changed && local->open_count) {
237                 ret = local->ops->config(local_to_hw(local), changed);
238                 /*
239                  * Goal:
240                  * HW reconfiguration should never fail, the driver has told
241                  * us what it can support so it should live up to that promise.
242                  *
243                  * Current status:
244                  * rfkill is not integrated with mac80211 and a
245                  * configuration command can thus fail if hardware rfkill
246                  * is enabled
247                  *
248                  * FIXME: integrate rfkill with mac80211 and then add this
249                  * WARN_ON() back
250                  *
251                  */
252                 /* WARN_ON(ret); */
253         }
254
255         return ret;
256 }
257
258 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
259                                       u32 changed)
260 {
261         struct ieee80211_local *local = sdata->local;
262
263         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
264                 return;
265
266         if (!changed)
267                 return;
268
269         if (local->ops->bss_info_changed)
270                 local->ops->bss_info_changed(local_to_hw(local),
271                                              &sdata->vif,
272                                              &sdata->vif.bss_conf,
273                                              changed);
274 }
275
276 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
277 {
278         sdata->vif.bss_conf.use_cts_prot = false;
279         sdata->vif.bss_conf.use_short_preamble = false;
280         sdata->vif.bss_conf.use_short_slot = false;
281         return BSS_CHANGED_ERP_CTS_PROT |
282                BSS_CHANGED_ERP_PREAMBLE |
283                BSS_CHANGED_ERP_SLOT;
284 }
285
286 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
287                                  struct sk_buff *skb)
288 {
289         struct ieee80211_local *local = hw_to_local(hw);
290         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
291         int tmp;
292
293         skb->dev = local->mdev;
294         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
295         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
296                        &local->skb_queue : &local->skb_queue_unreliable, skb);
297         tmp = skb_queue_len(&local->skb_queue) +
298                 skb_queue_len(&local->skb_queue_unreliable);
299         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
300                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
301                 dev_kfree_skb_irq(skb);
302                 tmp--;
303                 I802_DEBUG_INC(local->tx_status_drop);
304         }
305         tasklet_schedule(&local->tasklet);
306 }
307 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
308
309 static void ieee80211_tasklet_handler(unsigned long data)
310 {
311         struct ieee80211_local *local = (struct ieee80211_local *) data;
312         struct sk_buff *skb;
313         struct ieee80211_rx_status rx_status;
314         struct ieee80211_ra_tid *ra_tid;
315
316         while ((skb = skb_dequeue(&local->skb_queue)) ||
317                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
318                 switch (skb->pkt_type) {
319                 case IEEE80211_RX_MSG:
320                         /* status is in skb->cb */
321                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
322                         /* Clear skb->pkt_type in order to not confuse kernel
323                          * netstack. */
324                         skb->pkt_type = 0;
325                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
326                         break;
327                 case IEEE80211_TX_STATUS_MSG:
328                         skb->pkt_type = 0;
329                         ieee80211_tx_status(local_to_hw(local), skb);
330                         break;
331                 case IEEE80211_DELBA_MSG:
332                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
333                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
334                                                 ra_tid->ra, ra_tid->tid);
335                         dev_kfree_skb(skb);
336                         break;
337                 case IEEE80211_ADDBA_MSG:
338                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
339                         ieee80211_start_tx_ba_cb(local_to_hw(local),
340                                                  ra_tid->ra, ra_tid->tid);
341                         dev_kfree_skb(skb);
342                         break ;
343                 default:
344                         WARN_ON(1);
345                         dev_kfree_skb(skb);
346                         break;
347                 }
348         }
349 }
350
351 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
352  * make a prepared TX frame (one that has been given to hw) to look like brand
353  * new IEEE 802.11 frame that is ready to go through TX processing again.
354  */
355 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
356                                       struct ieee80211_key *key,
357                                       struct sk_buff *skb)
358 {
359         unsigned int hdrlen, iv_len, mic_len;
360         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
361
362         hdrlen = ieee80211_hdrlen(hdr->frame_control);
363
364         if (!key)
365                 goto no_key;
366
367         switch (key->conf.alg) {
368         case ALG_WEP:
369                 iv_len = WEP_IV_LEN;
370                 mic_len = WEP_ICV_LEN;
371                 break;
372         case ALG_TKIP:
373                 iv_len = TKIP_IV_LEN;
374                 mic_len = TKIP_ICV_LEN;
375                 break;
376         case ALG_CCMP:
377                 iv_len = CCMP_HDR_LEN;
378                 mic_len = CCMP_MIC_LEN;
379                 break;
380         default:
381                 goto no_key;
382         }
383
384         if (skb->len >= hdrlen + mic_len &&
385             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
386                 skb_trim(skb, skb->len - mic_len);
387         if (skb->len >= hdrlen + iv_len) {
388                 memmove(skb->data + iv_len, skb->data, hdrlen);
389                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
390         }
391
392 no_key:
393         if (ieee80211_is_data_qos(hdr->frame_control)) {
394                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
395                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
396                         hdrlen - IEEE80211_QOS_CTL_LEN);
397                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
398         }
399 }
400
401 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
402                                             struct sta_info *sta,
403                                             struct sk_buff *skb)
404 {
405         sta->tx_filtered_count++;
406
407         /*
408          * Clear the TX filter mask for this STA when sending the next
409          * packet. If the STA went to power save mode, this will happen
410          * when it wakes up for the next time.
411          */
412         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
413
414         /*
415          * This code races in the following way:
416          *
417          *  (1) STA sends frame indicating it will go to sleep and does so
418          *  (2) hardware/firmware adds STA to filter list, passes frame up
419          *  (3) hardware/firmware processes TX fifo and suppresses a frame
420          *  (4) we get TX status before having processed the frame and
421          *      knowing that the STA has gone to sleep.
422          *
423          * This is actually quite unlikely even when both those events are
424          * processed from interrupts coming in quickly after one another or
425          * even at the same time because we queue both TX status events and
426          * RX frames to be processed by a tasklet and process them in the
427          * same order that they were received or TX status last. Hence, there
428          * is no race as long as the frame RX is processed before the next TX
429          * status, which drivers can ensure, see below.
430          *
431          * Note that this can only happen if the hardware or firmware can
432          * actually add STAs to the filter list, if this is done by the
433          * driver in response to set_tim() (which will only reduce the race
434          * this whole filtering tries to solve, not completely solve it)
435          * this situation cannot happen.
436          *
437          * To completely solve this race drivers need to make sure that they
438          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
439          *      functions and
440          *  (b) always process RX events before TX status events if ordering
441          *      can be unknown, for example with different interrupt status
442          *      bits.
443          */
444         if (test_sta_flags(sta, WLAN_STA_PS) &&
445             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
446                 ieee80211_remove_tx_extra(local, sta->key, skb);
447                 skb_queue_tail(&sta->tx_filtered, skb);
448                 return;
449         }
450
451         if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
452                 /* Software retry the packet once */
453                 skb->requeue = 1;
454                 ieee80211_remove_tx_extra(local, sta->key, skb);
455                 dev_queue_xmit(skb);
456                 return;
457         }
458
459 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
460         if (net_ratelimit())
461                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
462                        "queue_len=%d PS=%d @%lu\n",
463                        wiphy_name(local->hw.wiphy),
464                        skb_queue_len(&sta->tx_filtered),
465                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
466 #endif
467         dev_kfree_skb(skb);
468 }
469
470 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
471 {
472         struct sk_buff *skb2;
473         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
474         struct ieee80211_local *local = hw_to_local(hw);
475         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
476         u16 frag, type;
477         __le16 fc;
478         struct ieee80211_supported_band *sband;
479         struct ieee80211_tx_status_rtap_hdr *rthdr;
480         struct ieee80211_sub_if_data *sdata;
481         struct net_device *prev_dev = NULL;
482         struct sta_info *sta;
483         int retry_count = -1, i;
484
485         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
486                 /* the HW cannot have attempted that rate */
487                 if (i >= hw->max_rates) {
488                         info->status.rates[i].idx = -1;
489                         info->status.rates[i].count = 0;
490                 }
491
492                 retry_count += info->status.rates[i].count;
493         }
494         if (retry_count < 0)
495                 retry_count = 0;
496
497         rcu_read_lock();
498
499         sband = local->hw.wiphy->bands[info->band];
500
501         sta = sta_info_get(local, hdr->addr1);
502
503         if (sta) {
504                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
505                     test_sta_flags(sta, WLAN_STA_PS)) {
506                         /*
507                          * The STA is in power save mode, so assume
508                          * that this TX packet failed because of that.
509                          */
510                         ieee80211_handle_filtered_frame(local, sta, skb);
511                         rcu_read_unlock();
512                         return;
513                 }
514
515                 fc = hdr->frame_control;
516
517                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
518                     (ieee80211_is_data_qos(fc))) {
519                         u16 tid, ssn;
520                         u8 *qc;
521
522                         qc = ieee80211_get_qos_ctl(hdr);
523                         tid = qc[0] & 0xf;
524                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
525                                                 & IEEE80211_SCTL_SEQ);
526                         ieee80211_send_bar(sta->sdata, hdr->addr1,
527                                            tid, ssn);
528                 }
529
530                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
531                         ieee80211_handle_filtered_frame(local, sta, skb);
532                         rcu_read_unlock();
533                         return;
534                 } else {
535                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
536                                 sta->tx_retry_failed++;
537                         sta->tx_retry_count += retry_count;
538                 }
539
540                 rate_control_tx_status(local, sband, sta, skb);
541         }
542
543         rcu_read_unlock();
544
545         ieee80211_led_tx(local, 0);
546
547         /* SNMP counters
548          * Fragments are passed to low-level drivers as separate skbs, so these
549          * are actually fragments, not frames. Update frame counters only for
550          * the first fragment of the frame. */
551
552         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
553         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
554
555         if (info->flags & IEEE80211_TX_STAT_ACK) {
556                 if (frag == 0) {
557                         local->dot11TransmittedFrameCount++;
558                         if (is_multicast_ether_addr(hdr->addr1))
559                                 local->dot11MulticastTransmittedFrameCount++;
560                         if (retry_count > 0)
561                                 local->dot11RetryCount++;
562                         if (retry_count > 1)
563                                 local->dot11MultipleRetryCount++;
564                 }
565
566                 /* This counter shall be incremented for an acknowledged MPDU
567                  * with an individual address in the address 1 field or an MPDU
568                  * with a multicast address in the address 1 field of type Data
569                  * or Management. */
570                 if (!is_multicast_ether_addr(hdr->addr1) ||
571                     type == IEEE80211_FTYPE_DATA ||
572                     type == IEEE80211_FTYPE_MGMT)
573                         local->dot11TransmittedFragmentCount++;
574         } else {
575                 if (frag == 0)
576                         local->dot11FailedCount++;
577         }
578
579         /* this was a transmitted frame, but now we want to reuse it */
580         skb_orphan(skb);
581
582         /*
583          * This is a bit racy but we can avoid a lot of work
584          * with this test...
585          */
586         if (!local->monitors && !local->cooked_mntrs) {
587                 dev_kfree_skb(skb);
588                 return;
589         }
590
591         /* send frame to monitor interfaces now */
592
593         if (skb_headroom(skb) < sizeof(*rthdr)) {
594                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
595                 dev_kfree_skb(skb);
596                 return;
597         }
598
599         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
600                                 skb_push(skb, sizeof(*rthdr));
601
602         memset(rthdr, 0, sizeof(*rthdr));
603         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
604         rthdr->hdr.it_present =
605                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
606                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
607                             (1 << IEEE80211_RADIOTAP_RATE));
608
609         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
610             !is_multicast_ether_addr(hdr->addr1))
611                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
612
613         /*
614          * XXX: Once radiotap gets the bitmap reset thing the vendor
615          *      extensions proposal contains, we can actually report
616          *      the whole set of tries we did.
617          */
618         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
619             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
620                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
621         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
622                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
623         if (info->status.rates[0].idx >= 0 &&
624             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
625                 rthdr->rate = sband->bitrates[
626                                 info->status.rates[0].idx].bitrate / 5;
627
628         /* for now report the total retry_count */
629         rthdr->data_retries = retry_count;
630
631         /* XXX: is this sufficient for BPF? */
632         skb_set_mac_header(skb, 0);
633         skb->ip_summed = CHECKSUM_UNNECESSARY;
634         skb->pkt_type = PACKET_OTHERHOST;
635         skb->protocol = htons(ETH_P_802_2);
636         memset(skb->cb, 0, sizeof(skb->cb));
637
638         rcu_read_lock();
639         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
640                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
641                         if (!netif_running(sdata->dev))
642                                 continue;
643
644                         if (prev_dev) {
645                                 skb2 = skb_clone(skb, GFP_ATOMIC);
646                                 if (skb2) {
647                                         skb2->dev = prev_dev;
648                                         netif_rx(skb2);
649                                 }
650                         }
651
652                         prev_dev = sdata->dev;
653                 }
654         }
655         if (prev_dev) {
656                 skb->dev = prev_dev;
657                 netif_rx(skb);
658                 skb = NULL;
659         }
660         rcu_read_unlock();
661         dev_kfree_skb(skb);
662 }
663 EXPORT_SYMBOL(ieee80211_tx_status);
664
665 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
666                                         const struct ieee80211_ops *ops)
667 {
668         struct ieee80211_local *local;
669         int priv_size;
670         struct wiphy *wiphy;
671
672         /* Ensure 32-byte alignment of our private data and hw private data.
673          * We use the wiphy priv data for both our ieee80211_local and for
674          * the driver's private data
675          *
676          * In memory it'll be like this:
677          *
678          * +-------------------------+
679          * | struct wiphy           |
680          * +-------------------------+
681          * | struct ieee80211_local  |
682          * +-------------------------+
683          * | driver's private data   |
684          * +-------------------------+
685          *
686          */
687         priv_size = ((sizeof(struct ieee80211_local) +
688                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
689                     priv_data_len;
690
691         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
692
693         if (!wiphy)
694                 return NULL;
695
696         wiphy->privid = mac80211_wiphy_privid;
697
698         local = wiphy_priv(wiphy);
699         local->hw.wiphy = wiphy;
700
701         local->hw.priv = (char *)local +
702                          ((sizeof(struct ieee80211_local) +
703                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
704
705         BUG_ON(!ops->tx);
706         BUG_ON(!ops->start);
707         BUG_ON(!ops->stop);
708         BUG_ON(!ops->config);
709         BUG_ON(!ops->add_interface);
710         BUG_ON(!ops->remove_interface);
711         BUG_ON(!ops->configure_filter);
712         local->ops = ops;
713
714         /* set up some defaults */
715         local->hw.queues = 1;
716         local->hw.max_rates = 1;
717         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
718         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
719         local->hw.conf.long_frame_max_tx_count = 4;
720         local->hw.conf.short_frame_max_tx_count = 7;
721         local->hw.conf.radio_enabled = true;
722
723         INIT_LIST_HEAD(&local->interfaces);
724
725         spin_lock_init(&local->key_lock);
726
727         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
728
729         sta_info_init(local);
730
731         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
732                      (unsigned long)local);
733         tasklet_disable(&local->tx_pending_tasklet);
734
735         tasklet_init(&local->tasklet,
736                      ieee80211_tasklet_handler,
737                      (unsigned long) local);
738         tasklet_disable(&local->tasklet);
739
740         skb_queue_head_init(&local->skb_queue);
741         skb_queue_head_init(&local->skb_queue_unreliable);
742
743         return local_to_hw(local);
744 }
745 EXPORT_SYMBOL(ieee80211_alloc_hw);
746
747 int ieee80211_register_hw(struct ieee80211_hw *hw)
748 {
749         struct ieee80211_local *local = hw_to_local(hw);
750         int result;
751         enum ieee80211_band band;
752         struct net_device *mdev;
753         struct ieee80211_master_priv *mpriv;
754
755         /*
756          * generic code guarantees at least one band,
757          * set this very early because much code assumes
758          * that hw.conf.channel is assigned
759          */
760         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
761                 struct ieee80211_supported_band *sband;
762
763                 sband = local->hw.wiphy->bands[band];
764                 if (sband) {
765                         /* init channel we're on */
766                         local->hw.conf.channel =
767                         local->oper_channel =
768                         local->scan_channel = &sband->channels[0];
769                         break;
770                 }
771         }
772
773         /* if low-level driver supports AP, we also support VLAN */
774         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
775                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
776
777         /* mac80211 always supports monitor */
778         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
779
780         result = wiphy_register(local->hw.wiphy);
781         if (result < 0)
782                 return result;
783
784         /*
785          * We use the number of queues for feature tests (QoS, HT) internally
786          * so restrict them appropriately.
787          */
788         if (hw->queues > IEEE80211_MAX_QUEUES)
789                 hw->queues = IEEE80211_MAX_QUEUES;
790         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
791                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
792         if (hw->queues < 4)
793                 hw->ampdu_queues = 0;
794
795         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
796                                "wmaster%d", ether_setup,
797                                ieee80211_num_queues(hw));
798         if (!mdev)
799                 goto fail_mdev_alloc;
800
801         mpriv = netdev_priv(mdev);
802         mpriv->local = local;
803         local->mdev = mdev;
804
805         ieee80211_rx_bss_list_init(local);
806
807         mdev->hard_start_xmit = ieee80211_master_start_xmit;
808         mdev->open = ieee80211_master_open;
809         mdev->stop = ieee80211_master_stop;
810         mdev->type = ARPHRD_IEEE80211;
811         mdev->header_ops = &ieee80211_header_ops;
812         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
813
814         local->hw.workqueue =
815                 create_freezeable_workqueue(wiphy_name(local->hw.wiphy));
816         if (!local->hw.workqueue) {
817                 result = -ENOMEM;
818                 goto fail_workqueue;
819         }
820
821         /*
822          * The hardware needs headroom for sending the frame,
823          * and we need some headroom for passing the frame to monitor
824          * interfaces, but never both at the same time.
825          */
826         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
827                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
828
829         debugfs_hw_add(local);
830
831         if (local->hw.conf.beacon_int < 10)
832                 local->hw.conf.beacon_int = 100;
833
834         if (local->hw.max_listen_interval == 0)
835                 local->hw.max_listen_interval = 1;
836
837         local->hw.conf.listen_interval = local->hw.max_listen_interval;
838
839         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
840                                                   IEEE80211_HW_SIGNAL_DB |
841                                                   IEEE80211_HW_SIGNAL_DBM) ?
842                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
843         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
844                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
845         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
846                 local->wstats_flags |= IW_QUAL_DBM;
847
848         result = sta_info_start(local);
849         if (result < 0)
850                 goto fail_sta_info;
851
852         rtnl_lock();
853         result = dev_alloc_name(local->mdev, local->mdev->name);
854         if (result < 0)
855                 goto fail_dev;
856
857         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
858         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
859
860         result = register_netdevice(local->mdev);
861         if (result < 0)
862                 goto fail_dev;
863
864         result = ieee80211_init_rate_ctrl_alg(local,
865                                               hw->rate_control_algorithm);
866         if (result < 0) {
867                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
868                        "algorithm\n", wiphy_name(local->hw.wiphy));
869                 goto fail_rate;
870         }
871
872         result = ieee80211_wep_init(local);
873
874         if (result < 0) {
875                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
876                        wiphy_name(local->hw.wiphy), result);
877                 goto fail_wep;
878         }
879
880         local->mdev->select_queue = ieee80211_select_queue;
881
882         /* add one default STA interface if supported */
883         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
884                 result = ieee80211_if_add(local, "wlan%d", NULL,
885                                           NL80211_IFTYPE_STATION, NULL);
886                 if (result)
887                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
888                                wiphy_name(local->hw.wiphy));
889         }
890
891         rtnl_unlock();
892
893         ieee80211_led_init(local);
894
895         return 0;
896
897 fail_wep:
898         rate_control_deinitialize(local);
899 fail_rate:
900         unregister_netdevice(local->mdev);
901         local->mdev = NULL;
902 fail_dev:
903         rtnl_unlock();
904         sta_info_stop(local);
905 fail_sta_info:
906         debugfs_hw_del(local);
907         destroy_workqueue(local->hw.workqueue);
908 fail_workqueue:
909         if (local->mdev)
910                 free_netdev(local->mdev);
911 fail_mdev_alloc:
912         wiphy_unregister(local->hw.wiphy);
913         return result;
914 }
915 EXPORT_SYMBOL(ieee80211_register_hw);
916
917 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
918 {
919         struct ieee80211_local *local = hw_to_local(hw);
920
921         tasklet_kill(&local->tx_pending_tasklet);
922         tasklet_kill(&local->tasklet);
923
924         rtnl_lock();
925
926         /*
927          * At this point, interface list manipulations are fine
928          * because the driver cannot be handing us frames any
929          * more and the tasklet is killed.
930          */
931
932         /* First, we remove all virtual interfaces. */
933         ieee80211_remove_interfaces(local);
934
935         /* then, finally, remove the master interface */
936         unregister_netdevice(local->mdev);
937
938         rtnl_unlock();
939
940         ieee80211_rx_bss_list_deinit(local);
941         ieee80211_clear_tx_pending(local);
942         sta_info_stop(local);
943         rate_control_deinitialize(local);
944         debugfs_hw_del(local);
945
946         if (skb_queue_len(&local->skb_queue)
947                         || skb_queue_len(&local->skb_queue_unreliable))
948                 printk(KERN_WARNING "%s: skb_queue not empty\n",
949                        wiphy_name(local->hw.wiphy));
950         skb_queue_purge(&local->skb_queue);
951         skb_queue_purge(&local->skb_queue_unreliable);
952
953         destroy_workqueue(local->hw.workqueue);
954         wiphy_unregister(local->hw.wiphy);
955         ieee80211_wep_free(local);
956         ieee80211_led_exit(local);
957         free_netdev(local->mdev);
958 }
959 EXPORT_SYMBOL(ieee80211_unregister_hw);
960
961 void ieee80211_free_hw(struct ieee80211_hw *hw)
962 {
963         struct ieee80211_local *local = hw_to_local(hw);
964
965         wiphy_free(local->hw.wiphy);
966 }
967 EXPORT_SYMBOL(ieee80211_free_hw);
968
969 static int __init ieee80211_init(void)
970 {
971         struct sk_buff *skb;
972         int ret;
973
974         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
975         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
976                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
977
978         ret = rc80211_minstrel_init();
979         if (ret)
980                 return ret;
981
982         ret = rc80211_pid_init();
983         if (ret)
984                 return ret;
985
986         ieee80211_debugfs_netdev_init();
987
988         return 0;
989 }
990
991 static void __exit ieee80211_exit(void)
992 {
993         rc80211_pid_exit();
994         rc80211_minstrel_exit();
995
996         /*
997          * For key todo, it'll be empty by now but the work
998          * might still be scheduled.
999          */
1000         flush_scheduled_work();
1001
1002         if (mesh_allocated)
1003                 ieee80211s_stop();
1004
1005         ieee80211_debugfs_netdev_exit();
1006 }
1007
1008
1009 subsys_initcall(ieee80211_init);
1010 module_exit(ieee80211_exit);
1011
1012 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1013 MODULE_LICENSE("GPL");