02cabbffc19a5249321b9db63705cb27f687a14b
[linux-2.6.git] / net / mac80211 / main.c
1 /*
2  * Copyright 2002-2005, Instant802 Networks, Inc.
3  * Copyright 2005-2006, Devicescape Software, Inc.
4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10
11 #include <net/mac80211.h>
12 #include <net/ieee80211_radiotap.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/netdevice.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/if_arp.h>
21 #include <linux/wireless.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/bitmap.h>
24 #include <linux/pm_qos_params.h>
25 #include <net/net_namespace.h>
26 #include <net/cfg80211.h>
27
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
30 #include "rate.h"
31 #include "mesh.h"
32 #include "wep.h"
33 #include "wme.h"
34 #include "aes_ccm.h"
35 #include "led.h"
36 #include "cfg.h"
37 #include "debugfs.h"
38 #include "debugfs_netdev.h"
39
40 /*
41  * For seeing transmitted packets on monitor interfaces
42  * we have a radiotap header too.
43  */
44 struct ieee80211_tx_status_rtap_hdr {
45         struct ieee80211_radiotap_header hdr;
46         u8 rate;
47         u8 padding_for_rate;
48         __le16 tx_flags;
49         u8 data_retries;
50 } __attribute__ ((packed));
51
52
53 /* must be called under mdev tx lock */
54 void ieee80211_configure_filter(struct ieee80211_local *local)
55 {
56         unsigned int changed_flags;
57         unsigned int new_flags = 0;
58
59         if (atomic_read(&local->iff_promiscs))
60                 new_flags |= FIF_PROMISC_IN_BSS;
61
62         if (atomic_read(&local->iff_allmultis))
63                 new_flags |= FIF_ALLMULTI;
64
65         if (local->monitors)
66                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
67
68         if (local->fif_fcsfail)
69                 new_flags |= FIF_FCSFAIL;
70
71         if (local->fif_plcpfail)
72                 new_flags |= FIF_PLCPFAIL;
73
74         if (local->fif_control)
75                 new_flags |= FIF_CONTROL;
76
77         if (local->fif_other_bss)
78                 new_flags |= FIF_OTHER_BSS;
79
80         changed_flags = local->filter_flags ^ new_flags;
81
82         /* be a bit nasty */
83         new_flags |= (1<<31);
84
85         drv_configure_filter(local, changed_flags, &new_flags,
86                              local->mc_count,
87                              local->mc_list);
88
89         WARN_ON(new_flags & (1<<31));
90
91         local->filter_flags = new_flags & ~(1<<31);
92 }
93
94 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
95 {
96         struct ieee80211_channel *chan, *scan_chan;
97         int ret = 0;
98         int power;
99         enum nl80211_channel_type channel_type;
100
101         might_sleep();
102
103         scan_chan = local->scan_channel;
104
105         if (scan_chan) {
106                 chan = scan_chan;
107                 channel_type = NL80211_CHAN_NO_HT;
108         } else {
109                 chan = local->oper_channel;
110                 channel_type = local->oper_channel_type;
111         }
112
113         if (chan != local->hw.conf.channel ||
114             channel_type != local->hw.conf.channel_type) {
115                 local->hw.conf.channel = chan;
116                 local->hw.conf.channel_type = channel_type;
117                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
118         }
119
120         if (scan_chan)
121                 power = chan->max_power;
122         else
123                 power = local->power_constr_level ?
124                         (chan->max_power - local->power_constr_level) :
125                         chan->max_power;
126
127         if (local->user_power_level >= 0)
128                 power = min(power, local->user_power_level);
129
130         if (local->hw.conf.power_level != power) {
131                 changed |= IEEE80211_CONF_CHANGE_POWER;
132                 local->hw.conf.power_level = power;
133         }
134
135         if (changed && local->open_count) {
136                 ret = drv_config(local, changed);
137                 /*
138                  * Goal:
139                  * HW reconfiguration should never fail, the driver has told
140                  * us what it can support so it should live up to that promise.
141                  *
142                  * Current status:
143                  * rfkill is not integrated with mac80211 and a
144                  * configuration command can thus fail if hardware rfkill
145                  * is enabled
146                  *
147                  * FIXME: integrate rfkill with mac80211 and then add this
148                  * WARN_ON() back
149                  *
150                  */
151                 /* WARN_ON(ret); */
152         }
153
154         return ret;
155 }
156
157 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
158                                       u32 changed)
159 {
160         struct ieee80211_local *local = sdata->local;
161         static const u8 zero[ETH_ALEN] = { 0 };
162
163         if (!changed)
164                 return;
165
166         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
167                 /*
168                  * While not associated, claim a BSSID of all-zeroes
169                  * so that drivers don't do any weird things with the
170                  * BSSID at that time.
171                  */
172                 if (sdata->vif.bss_conf.assoc)
173                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
174                 else
175                         sdata->vif.bss_conf.bssid = zero;
176         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
177                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
178         else if (sdata->vif.type == NL80211_IFTYPE_AP)
179                 sdata->vif.bss_conf.bssid = sdata->dev->dev_addr;
180         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
181                 sdata->vif.bss_conf.bssid = zero;
182         } else {
183                 WARN_ON(1);
184                 return;
185         }
186
187         switch (sdata->vif.type) {
188         case NL80211_IFTYPE_AP:
189         case NL80211_IFTYPE_ADHOC:
190         case NL80211_IFTYPE_MESH_POINT:
191                 break;
192         default:
193                 /* do not warn to simplify caller in scan.c */
194                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
195                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
196                         return;
197                 break;
198         }
199
200         if (changed & BSS_CHANGED_BEACON_ENABLED) {
201                 if (local->sw_scanning) {
202                         sdata->vif.bss_conf.enable_beacon = false;
203                 } else {
204                         /*
205                          * Beacon should be enabled, but AP mode must
206                          * check whether there is a beacon configured.
207                          */
208                         switch (sdata->vif.type) {
209                         case NL80211_IFTYPE_AP:
210                                 sdata->vif.bss_conf.enable_beacon =
211                                         !!rcu_dereference(sdata->u.ap.beacon);
212                                 break;
213                         case NL80211_IFTYPE_ADHOC:
214                                 sdata->vif.bss_conf.enable_beacon =
215                                         !!rcu_dereference(sdata->u.ibss.presp);
216                                 break;
217                         case NL80211_IFTYPE_MESH_POINT:
218                                 sdata->vif.bss_conf.enable_beacon = true;
219                                 break;
220                         default:
221                                 /* not reached */
222                                 WARN_ON(1);
223                                 break;
224                         }
225                 }
226         }
227
228         drv_bss_info_changed(local, &sdata->vif,
229                              &sdata->vif.bss_conf, changed);
230
231         /* DEPRECATED */
232         local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int;
233 }
234
235 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
236 {
237         sdata->vif.bss_conf.use_cts_prot = false;
238         sdata->vif.bss_conf.use_short_preamble = false;
239         sdata->vif.bss_conf.use_short_slot = false;
240         return BSS_CHANGED_ERP_CTS_PROT |
241                BSS_CHANGED_ERP_PREAMBLE |
242                BSS_CHANGED_ERP_SLOT;
243 }
244
245 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
246                                  struct sk_buff *skb)
247 {
248         struct ieee80211_local *local = hw_to_local(hw);
249         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
250         int tmp;
251
252         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
253         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
254                        &local->skb_queue : &local->skb_queue_unreliable, skb);
255         tmp = skb_queue_len(&local->skb_queue) +
256                 skb_queue_len(&local->skb_queue_unreliable);
257         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
258                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
259                 dev_kfree_skb_irq(skb);
260                 tmp--;
261                 I802_DEBUG_INC(local->tx_status_drop);
262         }
263         tasklet_schedule(&local->tasklet);
264 }
265 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
266
267 static void ieee80211_tasklet_handler(unsigned long data)
268 {
269         struct ieee80211_local *local = (struct ieee80211_local *) data;
270         struct sk_buff *skb;
271         struct ieee80211_ra_tid *ra_tid;
272
273         while ((skb = skb_dequeue(&local->skb_queue)) ||
274                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
275                 switch (skb->pkt_type) {
276                 case IEEE80211_RX_MSG:
277                         /* Clear skb->pkt_type in order to not confuse kernel
278                          * netstack. */
279                         skb->pkt_type = 0;
280                         ieee80211_rx(local_to_hw(local), skb);
281                         break;
282                 case IEEE80211_TX_STATUS_MSG:
283                         skb->pkt_type = 0;
284                         ieee80211_tx_status(local_to_hw(local), skb);
285                         break;
286                 case IEEE80211_DELBA_MSG:
287                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
288                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
289                                                 ra_tid->ra, ra_tid->tid);
290                         dev_kfree_skb(skb);
291                         break;
292                 case IEEE80211_ADDBA_MSG:
293                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
294                         ieee80211_start_tx_ba_cb(local_to_hw(local),
295                                                  ra_tid->ra, ra_tid->tid);
296                         dev_kfree_skb(skb);
297                         break ;
298                 default:
299                         WARN(1, "mac80211: Packet is of unknown type %d\n",
300                              skb->pkt_type);
301                         dev_kfree_skb(skb);
302                         break;
303                 }
304         }
305 }
306
307 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
308                                             struct sta_info *sta,
309                                             struct sk_buff *skb)
310 {
311         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
312
313         sta->tx_filtered_count++;
314
315         /*
316          * Clear the TX filter mask for this STA when sending the next
317          * packet. If the STA went to power save mode, this will happen
318          * when it wakes up for the next time.
319          */
320         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
321
322         /*
323          * This code races in the following way:
324          *
325          *  (1) STA sends frame indicating it will go to sleep and does so
326          *  (2) hardware/firmware adds STA to filter list, passes frame up
327          *  (3) hardware/firmware processes TX fifo and suppresses a frame
328          *  (4) we get TX status before having processed the frame and
329          *      knowing that the STA has gone to sleep.
330          *
331          * This is actually quite unlikely even when both those events are
332          * processed from interrupts coming in quickly after one another or
333          * even at the same time because we queue both TX status events and
334          * RX frames to be processed by a tasklet and process them in the
335          * same order that they were received or TX status last. Hence, there
336          * is no race as long as the frame RX is processed before the next TX
337          * status, which drivers can ensure, see below.
338          *
339          * Note that this can only happen if the hardware or firmware can
340          * actually add STAs to the filter list, if this is done by the
341          * driver in response to set_tim() (which will only reduce the race
342          * this whole filtering tries to solve, not completely solve it)
343          * this situation cannot happen.
344          *
345          * To completely solve this race drivers need to make sure that they
346          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
347          *      functions and
348          *  (b) always process RX events before TX status events if ordering
349          *      can be unknown, for example with different interrupt status
350          *      bits.
351          */
352         if (test_sta_flags(sta, WLAN_STA_PS) &&
353             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
354                 skb_queue_tail(&sta->tx_filtered, skb);
355                 return;
356         }
357
358         if (!test_sta_flags(sta, WLAN_STA_PS) &&
359             !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
360                 /* Software retry the packet once */
361                 info->flags |= IEEE80211_TX_INTFL_RETRIED;
362                 ieee80211_add_pending_skb(local, skb);
363                 return;
364         }
365
366 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
367         if (net_ratelimit())
368                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
369                        "queue_len=%d PS=%d @%lu\n",
370                        wiphy_name(local->hw.wiphy),
371                        skb_queue_len(&sta->tx_filtered),
372                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
373 #endif
374         dev_kfree_skb(skb);
375 }
376
377 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
378 {
379         struct sk_buff *skb2;
380         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
381         struct ieee80211_local *local = hw_to_local(hw);
382         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
383         u16 frag, type;
384         __le16 fc;
385         struct ieee80211_supported_band *sband;
386         struct ieee80211_tx_status_rtap_hdr *rthdr;
387         struct ieee80211_sub_if_data *sdata;
388         struct net_device *prev_dev = NULL;
389         struct sta_info *sta;
390         int retry_count = -1, i;
391
392         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
393                 /* the HW cannot have attempted that rate */
394                 if (i >= hw->max_rates) {
395                         info->status.rates[i].idx = -1;
396                         info->status.rates[i].count = 0;
397                 }
398
399                 retry_count += info->status.rates[i].count;
400         }
401         if (retry_count < 0)
402                 retry_count = 0;
403
404         rcu_read_lock();
405
406         sband = local->hw.wiphy->bands[info->band];
407
408         sta = sta_info_get(local, hdr->addr1);
409
410         if (sta) {
411                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
412                     test_sta_flags(sta, WLAN_STA_PS)) {
413                         /*
414                          * The STA is in power save mode, so assume
415                          * that this TX packet failed because of that.
416                          */
417                         ieee80211_handle_filtered_frame(local, sta, skb);
418                         rcu_read_unlock();
419                         return;
420                 }
421
422                 fc = hdr->frame_control;
423
424                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
425                     (ieee80211_is_data_qos(fc))) {
426                         u16 tid, ssn;
427                         u8 *qc;
428
429                         qc = ieee80211_get_qos_ctl(hdr);
430                         tid = qc[0] & 0xf;
431                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
432                                                 & IEEE80211_SCTL_SEQ);
433                         ieee80211_send_bar(sta->sdata, hdr->addr1,
434                                            tid, ssn);
435                 }
436
437                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
438                         ieee80211_handle_filtered_frame(local, sta, skb);
439                         rcu_read_unlock();
440                         return;
441                 } else {
442                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
443                                 sta->tx_retry_failed++;
444                         sta->tx_retry_count += retry_count;
445                 }
446
447                 rate_control_tx_status(local, sband, sta, skb);
448         }
449
450         rcu_read_unlock();
451
452         ieee80211_led_tx(local, 0);
453
454         /* SNMP counters
455          * Fragments are passed to low-level drivers as separate skbs, so these
456          * are actually fragments, not frames. Update frame counters only for
457          * the first fragment of the frame. */
458
459         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
460         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
461
462         if (info->flags & IEEE80211_TX_STAT_ACK) {
463                 if (frag == 0) {
464                         local->dot11TransmittedFrameCount++;
465                         if (is_multicast_ether_addr(hdr->addr1))
466                                 local->dot11MulticastTransmittedFrameCount++;
467                         if (retry_count > 0)
468                                 local->dot11RetryCount++;
469                         if (retry_count > 1)
470                                 local->dot11MultipleRetryCount++;
471                 }
472
473                 /* This counter shall be incremented for an acknowledged MPDU
474                  * with an individual address in the address 1 field or an MPDU
475                  * with a multicast address in the address 1 field of type Data
476                  * or Management. */
477                 if (!is_multicast_ether_addr(hdr->addr1) ||
478                     type == IEEE80211_FTYPE_DATA ||
479                     type == IEEE80211_FTYPE_MGMT)
480                         local->dot11TransmittedFragmentCount++;
481         } else {
482                 if (frag == 0)
483                         local->dot11FailedCount++;
484         }
485
486         /* this was a transmitted frame, but now we want to reuse it */
487         skb_orphan(skb);
488
489         /*
490          * This is a bit racy but we can avoid a lot of work
491          * with this test...
492          */
493         if (!local->monitors && !local->cooked_mntrs) {
494                 dev_kfree_skb(skb);
495                 return;
496         }
497
498         /* send frame to monitor interfaces now */
499
500         if (skb_headroom(skb) < sizeof(*rthdr)) {
501                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
502                 dev_kfree_skb(skb);
503                 return;
504         }
505
506         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
507                                 skb_push(skb, sizeof(*rthdr));
508
509         memset(rthdr, 0, sizeof(*rthdr));
510         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
511         rthdr->hdr.it_present =
512                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
513                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
514                             (1 << IEEE80211_RADIOTAP_RATE));
515
516         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
517             !is_multicast_ether_addr(hdr->addr1))
518                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
519
520         /*
521          * XXX: Once radiotap gets the bitmap reset thing the vendor
522          *      extensions proposal contains, we can actually report
523          *      the whole set of tries we did.
524          */
525         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
526             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
527                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
528         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
529                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
530         if (info->status.rates[0].idx >= 0 &&
531             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
532                 rthdr->rate = sband->bitrates[
533                                 info->status.rates[0].idx].bitrate / 5;
534
535         /* for now report the total retry_count */
536         rthdr->data_retries = retry_count;
537
538         /* XXX: is this sufficient for BPF? */
539         skb_set_mac_header(skb, 0);
540         skb->ip_summed = CHECKSUM_UNNECESSARY;
541         skb->pkt_type = PACKET_OTHERHOST;
542         skb->protocol = htons(ETH_P_802_2);
543         memset(skb->cb, 0, sizeof(skb->cb));
544
545         rcu_read_lock();
546         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
547                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
548                         if (!netif_running(sdata->dev))
549                                 continue;
550
551                         if (prev_dev) {
552                                 skb2 = skb_clone(skb, GFP_ATOMIC);
553                                 if (skb2) {
554                                         skb2->dev = prev_dev;
555                                         netif_rx(skb2);
556                                 }
557                         }
558
559                         prev_dev = sdata->dev;
560                 }
561         }
562         if (prev_dev) {
563                 skb->dev = prev_dev;
564                 netif_rx(skb);
565                 skb = NULL;
566         }
567         rcu_read_unlock();
568         dev_kfree_skb(skb);
569 }
570 EXPORT_SYMBOL(ieee80211_tx_status);
571
572 static void ieee80211_restart_work(struct work_struct *work)
573 {
574         struct ieee80211_local *local =
575                 container_of(work, struct ieee80211_local, restart_work);
576
577         rtnl_lock();
578         ieee80211_reconfig(local);
579         rtnl_unlock();
580 }
581
582 void ieee80211_restart_hw(struct ieee80211_hw *hw)
583 {
584         struct ieee80211_local *local = hw_to_local(hw);
585
586         /* use this reason, __ieee80211_resume will unblock it */
587         ieee80211_stop_queues_by_reason(hw,
588                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
589
590         schedule_work(&local->restart_work);
591 }
592 EXPORT_SYMBOL(ieee80211_restart_hw);
593
594 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
595                                         const struct ieee80211_ops *ops)
596 {
597         struct ieee80211_local *local;
598         int priv_size, i;
599         struct wiphy *wiphy;
600
601         /* Ensure 32-byte alignment of our private data and hw private data.
602          * We use the wiphy priv data for both our ieee80211_local and for
603          * the driver's private data
604          *
605          * In memory it'll be like this:
606          *
607          * +-------------------------+
608          * | struct wiphy           |
609          * +-------------------------+
610          * | struct ieee80211_local  |
611          * +-------------------------+
612          * | driver's private data   |
613          * +-------------------------+
614          *
615          */
616         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
617
618         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
619
620         if (!wiphy)
621                 return NULL;
622
623         wiphy->netnsok = true;
624         wiphy->privid = mac80211_wiphy_privid;
625
626         /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
627         wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
628                                sizeof(struct cfg80211_bss);
629
630         local = wiphy_priv(wiphy);
631
632         local->hw.wiphy = wiphy;
633
634         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
635
636         BUG_ON(!ops->tx);
637         BUG_ON(!ops->start);
638         BUG_ON(!ops->stop);
639         BUG_ON(!ops->config);
640         BUG_ON(!ops->add_interface);
641         BUG_ON(!ops->remove_interface);
642         BUG_ON(!ops->configure_filter);
643         local->ops = ops;
644
645         /* set up some defaults */
646         local->hw.queues = 1;
647         local->hw.max_rates = 1;
648         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
649         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
650         local->hw.conf.radio_enabled = true;
651         local->user_power_level = -1;
652
653         INIT_LIST_HEAD(&local->interfaces);
654         mutex_init(&local->iflist_mtx);
655         mutex_init(&local->scan_mtx);
656
657         spin_lock_init(&local->key_lock);
658         spin_lock_init(&local->filter_lock);
659         spin_lock_init(&local->queue_stop_reason_lock);
660
661         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
662
663         INIT_WORK(&local->restart_work, ieee80211_restart_work);
664
665         INIT_WORK(&local->dynamic_ps_enable_work,
666                   ieee80211_dynamic_ps_enable_work);
667         INIT_WORK(&local->dynamic_ps_disable_work,
668                   ieee80211_dynamic_ps_disable_work);
669         setup_timer(&local->dynamic_ps_timer,
670                     ieee80211_dynamic_ps_timer, (unsigned long) local);
671
672         sta_info_init(local);
673
674         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
675                 skb_queue_head_init(&local->pending[i]);
676         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
677                      (unsigned long)local);
678         tasklet_disable(&local->tx_pending_tasklet);
679
680         tasklet_init(&local->tasklet,
681                      ieee80211_tasklet_handler,
682                      (unsigned long) local);
683         tasklet_disable(&local->tasklet);
684
685         skb_queue_head_init(&local->skb_queue);
686         skb_queue_head_init(&local->skb_queue_unreliable);
687
688         spin_lock_init(&local->ampdu_lock);
689
690         return local_to_hw(local);
691 }
692 EXPORT_SYMBOL(ieee80211_alloc_hw);
693
694 int ieee80211_register_hw(struct ieee80211_hw *hw)
695 {
696         struct ieee80211_local *local = hw_to_local(hw);
697         int result;
698         enum ieee80211_band band;
699         int channels, i, j, max_bitrates;
700         bool supp_ht;
701         static const u32 cipher_suites[] = {
702                 WLAN_CIPHER_SUITE_WEP40,
703                 WLAN_CIPHER_SUITE_WEP104,
704                 WLAN_CIPHER_SUITE_TKIP,
705                 WLAN_CIPHER_SUITE_CCMP,
706
707                 /* keep last -- depends on hw flags! */
708                 WLAN_CIPHER_SUITE_AES_CMAC
709         };
710
711         /*
712          * generic code guarantees at least one band,
713          * set this very early because much code assumes
714          * that hw.conf.channel is assigned
715          */
716         channels = 0;
717         max_bitrates = 0;
718         supp_ht = false;
719         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
720                 struct ieee80211_supported_band *sband;
721
722                 sband = local->hw.wiphy->bands[band];
723                 if (!sband)
724                         continue;
725                 if (!local->oper_channel) {
726                         /* init channel we're on */
727                         local->hw.conf.channel =
728                         local->oper_channel = &sband->channels[0];
729                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
730                 }
731                 channels += sband->n_channels;
732
733                 if (max_bitrates < sband->n_bitrates)
734                         max_bitrates = sband->n_bitrates;
735                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
736         }
737
738         local->int_scan_req.n_channels = channels;
739         local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
740         if (!local->int_scan_req.channels)
741                 return -ENOMEM;
742
743         /* if low-level driver supports AP, we also support VLAN */
744         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
745                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
746
747         /* mac80211 always supports monitor */
748         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
749
750         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
751                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
752         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
753                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
754
755         /*
756          * Calculate scan IE length -- we need this to alloc
757          * memory and to subtract from the driver limit. It
758          * includes the (extended) supported rates and HT
759          * information -- SSID is the driver's responsibility.
760          */
761         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
762         if (supp_ht)
763                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
764
765         if (!local->ops->hw_scan) {
766                 /* For hw_scan, driver needs to set these up. */
767                 local->hw.wiphy->max_scan_ssids = 4;
768                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
769         }
770
771         /*
772          * If the driver supports any scan IEs, then assume the
773          * limit includes the IEs mac80211 will add, otherwise
774          * leave it at zero and let the driver sort it out; we
775          * still pass our IEs to the driver but userspace will
776          * not be allowed to in that case.
777          */
778         if (local->hw.wiphy->max_scan_ie_len)
779                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
780
781         local->hw.wiphy->cipher_suites = cipher_suites;
782         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
783         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
784                 local->hw.wiphy->n_cipher_suites--;
785
786         result = wiphy_register(local->hw.wiphy);
787         if (result < 0)
788                 goto fail_wiphy_register;
789
790         /*
791          * We use the number of queues for feature tests (QoS, HT) internally
792          * so restrict them appropriately.
793          */
794         if (hw->queues > IEEE80211_MAX_QUEUES)
795                 hw->queues = IEEE80211_MAX_QUEUES;
796
797         local->hw.workqueue =
798                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
799         if (!local->hw.workqueue) {
800                 result = -ENOMEM;
801                 goto fail_workqueue;
802         }
803
804         /*
805          * The hardware needs headroom for sending the frame,
806          * and we need some headroom for passing the frame to monitor
807          * interfaces, but never both at the same time.
808          */
809         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
810                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
811
812         debugfs_hw_add(local);
813
814         if (local->hw.max_listen_interval == 0)
815                 local->hw.max_listen_interval = 1;
816
817         local->hw.conf.listen_interval = local->hw.max_listen_interval;
818
819         result = sta_info_start(local);
820         if (result < 0)
821                 goto fail_sta_info;
822
823         result = ieee80211_wep_init(local);
824         if (result < 0) {
825                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
826                        wiphy_name(local->hw.wiphy), result);
827                 goto fail_wep;
828         }
829
830         rtnl_lock();
831
832         result = ieee80211_init_rate_ctrl_alg(local,
833                                               hw->rate_control_algorithm);
834         if (result < 0) {
835                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
836                        "algorithm\n", wiphy_name(local->hw.wiphy));
837                 goto fail_rate;
838         }
839
840         /* add one default STA interface if supported */
841         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
842                 result = ieee80211_if_add(local, "wlan%d", NULL,
843                                           NL80211_IFTYPE_STATION, NULL);
844                 if (result)
845                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
846                                wiphy_name(local->hw.wiphy));
847         }
848
849         rtnl_unlock();
850
851         ieee80211_led_init(local);
852
853         /* alloc internal scan request */
854         i = 0;
855         local->int_scan_req.ssids = &local->scan_ssid;
856         local->int_scan_req.n_ssids = 1;
857         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
858                 if (!hw->wiphy->bands[band])
859                         continue;
860                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
861                         local->int_scan_req.channels[i] =
862                                 &hw->wiphy->bands[band]->channels[j];
863                         i++;
864                 }
865         }
866
867         local->network_latency_notifier.notifier_call =
868                 ieee80211_max_network_latency;
869         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
870                                      &local->network_latency_notifier);
871
872         if (result) {
873                 rtnl_lock();
874                 goto fail_pm_qos;
875         }
876
877         return 0;
878
879  fail_pm_qos:
880         ieee80211_led_exit(local);
881         ieee80211_remove_interfaces(local);
882  fail_rate:
883         rtnl_unlock();
884         ieee80211_wep_free(local);
885  fail_wep:
886         sta_info_stop(local);
887  fail_sta_info:
888         debugfs_hw_del(local);
889         destroy_workqueue(local->hw.workqueue);
890  fail_workqueue:
891         wiphy_unregister(local->hw.wiphy);
892  fail_wiphy_register:
893         kfree(local->int_scan_req.channels);
894         return result;
895 }
896 EXPORT_SYMBOL(ieee80211_register_hw);
897
898 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
899 {
900         struct ieee80211_local *local = hw_to_local(hw);
901
902         tasklet_kill(&local->tx_pending_tasklet);
903         tasklet_kill(&local->tasklet);
904
905         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
906                                &local->network_latency_notifier);
907
908         rtnl_lock();
909
910         /*
911          * At this point, interface list manipulations are fine
912          * because the driver cannot be handing us frames any
913          * more and the tasklet is killed.
914          */
915         ieee80211_remove_interfaces(local);
916
917         rtnl_unlock();
918
919         ieee80211_clear_tx_pending(local);
920         sta_info_stop(local);
921         rate_control_deinitialize(local);
922         debugfs_hw_del(local);
923
924         if (skb_queue_len(&local->skb_queue)
925                         || skb_queue_len(&local->skb_queue_unreliable))
926                 printk(KERN_WARNING "%s: skb_queue not empty\n",
927                        wiphy_name(local->hw.wiphy));
928         skb_queue_purge(&local->skb_queue);
929         skb_queue_purge(&local->skb_queue_unreliable);
930
931         destroy_workqueue(local->hw.workqueue);
932         wiphy_unregister(local->hw.wiphy);
933         ieee80211_wep_free(local);
934         ieee80211_led_exit(local);
935         kfree(local->int_scan_req.channels);
936 }
937 EXPORT_SYMBOL(ieee80211_unregister_hw);
938
939 void ieee80211_free_hw(struct ieee80211_hw *hw)
940 {
941         struct ieee80211_local *local = hw_to_local(hw);
942
943         mutex_destroy(&local->iflist_mtx);
944         mutex_destroy(&local->scan_mtx);
945
946         wiphy_free(local->hw.wiphy);
947 }
948 EXPORT_SYMBOL(ieee80211_free_hw);
949
950 static int __init ieee80211_init(void)
951 {
952         struct sk_buff *skb;
953         int ret;
954
955         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
956         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
957                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
958
959         ret = rc80211_minstrel_init();
960         if (ret)
961                 return ret;
962
963         ret = rc80211_pid_init();
964         if (ret)
965                 return ret;
966
967         ieee80211_debugfs_netdev_init();
968
969         return 0;
970 }
971
972 static void __exit ieee80211_exit(void)
973 {
974         rc80211_pid_exit();
975         rc80211_minstrel_exit();
976
977         /*
978          * For key todo, it'll be empty by now but the work
979          * might still be scheduled.
980          */
981         flush_scheduled_work();
982
983         if (mesh_allocated)
984                 ieee80211s_stop();
985
986         ieee80211_debugfs_netdev_exit();
987 }
988
989
990 subsys_initcall(ieee80211_init);
991 module_exit(ieee80211_exit);
992
993 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
994 MODULE_LICENSE("GPL");