Merge branch 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvar...
[linux-2.6] / net / mac80211 / main.c
1 /*
2  * Copyright 2002-2005, Instant802 Networks, Inc.
3  * Copyright 2005-2006, Devicescape Software, Inc.
4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10
11 #include <net/mac80211.h>
12 #include <net/ieee80211_radiotap.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/netdevice.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/if_arp.h>
21 #include <linux/wireless.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/bitmap.h>
24 #include <linux/pm_qos_params.h>
25 #include <net/net_namespace.h>
26 #include <net/cfg80211.h>
27
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
30 #include "rate.h"
31 #include "mesh.h"
32 #include "wep.h"
33 #include "wme.h"
34 #include "aes_ccm.h"
35 #include "led.h"
36 #include "cfg.h"
37 #include "debugfs.h"
38 #include "debugfs_netdev.h"
39
40 /*
41  * For seeing transmitted packets on monitor interfaces
42  * we have a radiotap header too.
43  */
44 struct ieee80211_tx_status_rtap_hdr {
45         struct ieee80211_radiotap_header hdr;
46         u8 rate;
47         u8 padding_for_rate;
48         __le16 tx_flags;
49         u8 data_retries;
50 } __attribute__ ((packed));
51
52
53 /* must be called under mdev tx lock */
54 void ieee80211_configure_filter(struct ieee80211_local *local)
55 {
56         unsigned int changed_flags;
57         unsigned int new_flags = 0;
58
59         if (atomic_read(&local->iff_promiscs))
60                 new_flags |= FIF_PROMISC_IN_BSS;
61
62         if (atomic_read(&local->iff_allmultis))
63                 new_flags |= FIF_ALLMULTI;
64
65         if (local->monitors)
66                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
67
68         if (local->fif_fcsfail)
69                 new_flags |= FIF_FCSFAIL;
70
71         if (local->fif_plcpfail)
72                 new_flags |= FIF_PLCPFAIL;
73
74         if (local->fif_control)
75                 new_flags |= FIF_CONTROL;
76
77         if (local->fif_other_bss)
78                 new_flags |= FIF_OTHER_BSS;
79
80         changed_flags = local->filter_flags ^ new_flags;
81
82         /* be a bit nasty */
83         new_flags |= (1<<31);
84
85         drv_configure_filter(local, changed_flags, &new_flags,
86                              local->mdev->mc_count,
87                              local->mdev->mc_list);
88
89         WARN_ON(new_flags & (1<<31));
90
91         local->filter_flags = new_flags & ~(1<<31);
92 }
93
94 /* master interface */
95
96 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
97 {
98         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
99         return ETH_ALEN;
100 }
101
102 static const struct header_ops ieee80211_header_ops = {
103         .create         = eth_header,
104         .parse          = header_parse_80211,
105         .rebuild        = eth_rebuild_header,
106         .cache          = eth_header_cache,
107         .cache_update   = eth_header_cache_update,
108 };
109
110 static int ieee80211_master_open(struct net_device *dev)
111 {
112         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
113         struct ieee80211_local *local = mpriv->local;
114         struct ieee80211_sub_if_data *sdata;
115         int res = -EOPNOTSUPP;
116
117         /* we hold the RTNL here so can safely walk the list */
118         list_for_each_entry(sdata, &local->interfaces, list) {
119                 if (netif_running(sdata->dev)) {
120                         res = 0;
121                         break;
122                 }
123         }
124
125         if (res)
126                 return res;
127
128         netif_tx_start_all_queues(local->mdev);
129
130         return 0;
131 }
132
133 static int ieee80211_master_stop(struct net_device *dev)
134 {
135         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
136         struct ieee80211_local *local = mpriv->local;
137         struct ieee80211_sub_if_data *sdata;
138
139         /* we hold the RTNL here so can safely walk the list */
140         list_for_each_entry(sdata, &local->interfaces, list)
141                 if (netif_running(sdata->dev))
142                         dev_close(sdata->dev);
143
144         return 0;
145 }
146
147 static void ieee80211_master_set_multicast_list(struct net_device *dev)
148 {
149         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
150         struct ieee80211_local *local = mpriv->local;
151
152         ieee80211_configure_filter(local);
153 }
154
155 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
156 {
157         struct ieee80211_channel *chan, *scan_chan;
158         int ret = 0;
159         int power;
160         enum nl80211_channel_type channel_type;
161
162         might_sleep();
163
164         scan_chan = local->scan_channel;
165
166         if (scan_chan) {
167                 chan = scan_chan;
168                 channel_type = NL80211_CHAN_NO_HT;
169         } else {
170                 chan = local->oper_channel;
171                 channel_type = local->oper_channel_type;
172         }
173
174         if (chan != local->hw.conf.channel ||
175             channel_type != local->hw.conf.channel_type) {
176                 local->hw.conf.channel = chan;
177                 local->hw.conf.channel_type = channel_type;
178                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
179         }
180
181         if (scan_chan)
182                 power = chan->max_power;
183         else
184                 power = local->power_constr_level ?
185                         (chan->max_power - local->power_constr_level) :
186                         chan->max_power;
187
188         if (local->user_power_level >= 0)
189                 power = min(power, local->user_power_level);
190
191         if (local->hw.conf.power_level != power) {
192                 changed |= IEEE80211_CONF_CHANGE_POWER;
193                 local->hw.conf.power_level = power;
194         }
195
196         if (changed && local->open_count) {
197                 ret = drv_config(local, changed);
198                 /*
199                  * Goal:
200                  * HW reconfiguration should never fail, the driver has told
201                  * us what it can support so it should live up to that promise.
202                  *
203                  * Current status:
204                  * rfkill is not integrated with mac80211 and a
205                  * configuration command can thus fail if hardware rfkill
206                  * is enabled
207                  *
208                  * FIXME: integrate rfkill with mac80211 and then add this
209                  * WARN_ON() back
210                  *
211                  */
212                 /* WARN_ON(ret); */
213         }
214
215         return ret;
216 }
217
218 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
219                                       u32 changed)
220 {
221         struct ieee80211_local *local = sdata->local;
222         static const u8 zero[ETH_ALEN] = { 0 };
223
224         if (!changed)
225                 return;
226
227         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
228                 /*
229                  * While not associated, claim a BSSID of all-zeroes
230                  * so that drivers don't do any weird things with the
231                  * BSSID at that time.
232                  */
233                 if (sdata->vif.bss_conf.assoc)
234                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
235                 else
236                         sdata->vif.bss_conf.bssid = zero;
237         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
238                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
239         else if (sdata->vif.type == NL80211_IFTYPE_AP)
240                 sdata->vif.bss_conf.bssid = sdata->dev->dev_addr;
241         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
242                 sdata->vif.bss_conf.bssid = zero;
243         } else {
244                 WARN_ON(1);
245                 return;
246         }
247
248         switch (sdata->vif.type) {
249         case NL80211_IFTYPE_AP:
250         case NL80211_IFTYPE_ADHOC:
251         case NL80211_IFTYPE_MESH_POINT:
252                 break;
253         default:
254                 /* do not warn to simplify caller in scan.c */
255                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
256                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
257                         return;
258                 break;
259         }
260
261         if (changed & BSS_CHANGED_BEACON_ENABLED) {
262                 if (local->sw_scanning) {
263                         sdata->vif.bss_conf.enable_beacon = false;
264                 } else {
265                         /*
266                          * Beacon should be enabled, but AP mode must
267                          * check whether there is a beacon configured.
268                          */
269                         switch (sdata->vif.type) {
270                         case NL80211_IFTYPE_AP:
271                                 sdata->vif.bss_conf.enable_beacon =
272                                         !!rcu_dereference(sdata->u.ap.beacon);
273                                 break;
274                         case NL80211_IFTYPE_ADHOC:
275                                 sdata->vif.bss_conf.enable_beacon =
276                                         !!rcu_dereference(sdata->u.ibss.presp);
277                                 break;
278                         case NL80211_IFTYPE_MESH_POINT:
279                                 sdata->vif.bss_conf.enable_beacon = true;
280                                 break;
281                         default:
282                                 /* not reached */
283                                 WARN_ON(1);
284                                 break;
285                         }
286                 }
287         }
288
289         drv_bss_info_changed(local, &sdata->vif,
290                              &sdata->vif.bss_conf, changed);
291
292         /* DEPRECATED */
293         local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int;
294 }
295
296 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
297 {
298         sdata->vif.bss_conf.use_cts_prot = false;
299         sdata->vif.bss_conf.use_short_preamble = false;
300         sdata->vif.bss_conf.use_short_slot = false;
301         return BSS_CHANGED_ERP_CTS_PROT |
302                BSS_CHANGED_ERP_PREAMBLE |
303                BSS_CHANGED_ERP_SLOT;
304 }
305
306 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
307                                  struct sk_buff *skb)
308 {
309         struct ieee80211_local *local = hw_to_local(hw);
310         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
311         int tmp;
312
313         skb->dev = local->mdev;
314         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
315         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
316                        &local->skb_queue : &local->skb_queue_unreliable, skb);
317         tmp = skb_queue_len(&local->skb_queue) +
318                 skb_queue_len(&local->skb_queue_unreliable);
319         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
320                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
321                 dev_kfree_skb_irq(skb);
322                 tmp--;
323                 I802_DEBUG_INC(local->tx_status_drop);
324         }
325         tasklet_schedule(&local->tasklet);
326 }
327 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
328
329 static void ieee80211_tasklet_handler(unsigned long data)
330 {
331         struct ieee80211_local *local = (struct ieee80211_local *) data;
332         struct sk_buff *skb;
333         struct ieee80211_rx_status rx_status;
334         struct ieee80211_ra_tid *ra_tid;
335
336         while ((skb = skb_dequeue(&local->skb_queue)) ||
337                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
338                 switch (skb->pkt_type) {
339                 case IEEE80211_RX_MSG:
340                         /* status is in skb->cb */
341                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
342                         /* Clear skb->pkt_type in order to not confuse kernel
343                          * netstack. */
344                         skb->pkt_type = 0;
345                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
346                         break;
347                 case IEEE80211_TX_STATUS_MSG:
348                         skb->pkt_type = 0;
349                         ieee80211_tx_status(local_to_hw(local), skb);
350                         break;
351                 case IEEE80211_DELBA_MSG:
352                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
353                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
354                                                 ra_tid->ra, ra_tid->tid);
355                         dev_kfree_skb(skb);
356                         break;
357                 case IEEE80211_ADDBA_MSG:
358                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
359                         ieee80211_start_tx_ba_cb(local_to_hw(local),
360                                                  ra_tid->ra, ra_tid->tid);
361                         dev_kfree_skb(skb);
362                         break ;
363                 default:
364                         WARN(1, "mac80211: Packet is of unknown type %d\n",
365                              skb->pkt_type);
366                         dev_kfree_skb(skb);
367                         break;
368                 }
369         }
370 }
371
372 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
373                                             struct sta_info *sta,
374                                             struct sk_buff *skb)
375 {
376         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
377
378         sta->tx_filtered_count++;
379
380         /*
381          * Clear the TX filter mask for this STA when sending the next
382          * packet. If the STA went to power save mode, this will happen
383          * when it wakes up for the next time.
384          */
385         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
386
387         /*
388          * This code races in the following way:
389          *
390          *  (1) STA sends frame indicating it will go to sleep and does so
391          *  (2) hardware/firmware adds STA to filter list, passes frame up
392          *  (3) hardware/firmware processes TX fifo and suppresses a frame
393          *  (4) we get TX status before having processed the frame and
394          *      knowing that the STA has gone to sleep.
395          *
396          * This is actually quite unlikely even when both those events are
397          * processed from interrupts coming in quickly after one another or
398          * even at the same time because we queue both TX status events and
399          * RX frames to be processed by a tasklet and process them in the
400          * same order that they were received or TX status last. Hence, there
401          * is no race as long as the frame RX is processed before the next TX
402          * status, which drivers can ensure, see below.
403          *
404          * Note that this can only happen if the hardware or firmware can
405          * actually add STAs to the filter list, if this is done by the
406          * driver in response to set_tim() (which will only reduce the race
407          * this whole filtering tries to solve, not completely solve it)
408          * this situation cannot happen.
409          *
410          * To completely solve this race drivers need to make sure that they
411          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
412          *      functions and
413          *  (b) always process RX events before TX status events if ordering
414          *      can be unknown, for example with different interrupt status
415          *      bits.
416          */
417         if (test_sta_flags(sta, WLAN_STA_PS) &&
418             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
419                 skb_queue_tail(&sta->tx_filtered, skb);
420                 return;
421         }
422
423         if (!test_sta_flags(sta, WLAN_STA_PS) &&
424             !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
425                 /* Software retry the packet once */
426                 info->flags |= IEEE80211_TX_INTFL_RETRIED;
427                 ieee80211_add_pending_skb(local, skb);
428                 return;
429         }
430
431 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
432         if (net_ratelimit())
433                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
434                        "queue_len=%d PS=%d @%lu\n",
435                        wiphy_name(local->hw.wiphy),
436                        skb_queue_len(&sta->tx_filtered),
437                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
438 #endif
439         dev_kfree_skb(skb);
440 }
441
442 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
443 {
444         struct sk_buff *skb2;
445         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
446         struct ieee80211_local *local = hw_to_local(hw);
447         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
448         u16 frag, type;
449         __le16 fc;
450         struct ieee80211_supported_band *sband;
451         struct ieee80211_tx_status_rtap_hdr *rthdr;
452         struct ieee80211_sub_if_data *sdata;
453         struct net_device *prev_dev = NULL;
454         struct sta_info *sta;
455         int retry_count = -1, i;
456
457         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
458                 /* the HW cannot have attempted that rate */
459                 if (i >= hw->max_rates) {
460                         info->status.rates[i].idx = -1;
461                         info->status.rates[i].count = 0;
462                 }
463
464                 retry_count += info->status.rates[i].count;
465         }
466         if (retry_count < 0)
467                 retry_count = 0;
468
469         rcu_read_lock();
470
471         sband = local->hw.wiphy->bands[info->band];
472
473         sta = sta_info_get(local, hdr->addr1);
474
475         if (sta) {
476                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
477                     test_sta_flags(sta, WLAN_STA_PS)) {
478                         /*
479                          * The STA is in power save mode, so assume
480                          * that this TX packet failed because of that.
481                          */
482                         ieee80211_handle_filtered_frame(local, sta, skb);
483                         rcu_read_unlock();
484                         return;
485                 }
486
487                 fc = hdr->frame_control;
488
489                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
490                     (ieee80211_is_data_qos(fc))) {
491                         u16 tid, ssn;
492                         u8 *qc;
493
494                         qc = ieee80211_get_qos_ctl(hdr);
495                         tid = qc[0] & 0xf;
496                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
497                                                 & IEEE80211_SCTL_SEQ);
498                         ieee80211_send_bar(sta->sdata, hdr->addr1,
499                                            tid, ssn);
500                 }
501
502                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
503                         ieee80211_handle_filtered_frame(local, sta, skb);
504                         rcu_read_unlock();
505                         return;
506                 } else {
507                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
508                                 sta->tx_retry_failed++;
509                         sta->tx_retry_count += retry_count;
510                 }
511
512                 rate_control_tx_status(local, sband, sta, skb);
513         }
514
515         rcu_read_unlock();
516
517         ieee80211_led_tx(local, 0);
518
519         /* SNMP counters
520          * Fragments are passed to low-level drivers as separate skbs, so these
521          * are actually fragments, not frames. Update frame counters only for
522          * the first fragment of the frame. */
523
524         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
525         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
526
527         if (info->flags & IEEE80211_TX_STAT_ACK) {
528                 if (frag == 0) {
529                         local->dot11TransmittedFrameCount++;
530                         if (is_multicast_ether_addr(hdr->addr1))
531                                 local->dot11MulticastTransmittedFrameCount++;
532                         if (retry_count > 0)
533                                 local->dot11RetryCount++;
534                         if (retry_count > 1)
535                                 local->dot11MultipleRetryCount++;
536                 }
537
538                 /* This counter shall be incremented for an acknowledged MPDU
539                  * with an individual address in the address 1 field or an MPDU
540                  * with a multicast address in the address 1 field of type Data
541                  * or Management. */
542                 if (!is_multicast_ether_addr(hdr->addr1) ||
543                     type == IEEE80211_FTYPE_DATA ||
544                     type == IEEE80211_FTYPE_MGMT)
545                         local->dot11TransmittedFragmentCount++;
546         } else {
547                 if (frag == 0)
548                         local->dot11FailedCount++;
549         }
550
551         /* this was a transmitted frame, but now we want to reuse it */
552         skb_orphan(skb);
553
554         /*
555          * This is a bit racy but we can avoid a lot of work
556          * with this test...
557          */
558         if (!local->monitors && !local->cooked_mntrs) {
559                 dev_kfree_skb(skb);
560                 return;
561         }
562
563         /* send frame to monitor interfaces now */
564
565         if (skb_headroom(skb) < sizeof(*rthdr)) {
566                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
567                 dev_kfree_skb(skb);
568                 return;
569         }
570
571         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
572                                 skb_push(skb, sizeof(*rthdr));
573
574         memset(rthdr, 0, sizeof(*rthdr));
575         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
576         rthdr->hdr.it_present =
577                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
578                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
579                             (1 << IEEE80211_RADIOTAP_RATE));
580
581         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
582             !is_multicast_ether_addr(hdr->addr1))
583                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
584
585         /*
586          * XXX: Once radiotap gets the bitmap reset thing the vendor
587          *      extensions proposal contains, we can actually report
588          *      the whole set of tries we did.
589          */
590         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
591             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
592                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
593         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
594                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
595         if (info->status.rates[0].idx >= 0 &&
596             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
597                 rthdr->rate = sband->bitrates[
598                                 info->status.rates[0].idx].bitrate / 5;
599
600         /* for now report the total retry_count */
601         rthdr->data_retries = retry_count;
602
603         /* XXX: is this sufficient for BPF? */
604         skb_set_mac_header(skb, 0);
605         skb->ip_summed = CHECKSUM_UNNECESSARY;
606         skb->pkt_type = PACKET_OTHERHOST;
607         skb->protocol = htons(ETH_P_802_2);
608         memset(skb->cb, 0, sizeof(skb->cb));
609
610         rcu_read_lock();
611         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
612                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
613                         if (!netif_running(sdata->dev))
614                                 continue;
615
616                         if (prev_dev) {
617                                 skb2 = skb_clone(skb, GFP_ATOMIC);
618                                 if (skb2) {
619                                         skb2->dev = prev_dev;
620                                         netif_rx(skb2);
621                                 }
622                         }
623
624                         prev_dev = sdata->dev;
625                 }
626         }
627         if (prev_dev) {
628                 skb->dev = prev_dev;
629                 netif_rx(skb);
630                 skb = NULL;
631         }
632         rcu_read_unlock();
633         dev_kfree_skb(skb);
634 }
635 EXPORT_SYMBOL(ieee80211_tx_status);
636
637 static void ieee80211_restart_work(struct work_struct *work)
638 {
639         struct ieee80211_local *local =
640                 container_of(work, struct ieee80211_local, restart_work);
641
642         rtnl_lock();
643         ieee80211_reconfig(local);
644         rtnl_unlock();
645 }
646
647 void ieee80211_restart_hw(struct ieee80211_hw *hw)
648 {
649         struct ieee80211_local *local = hw_to_local(hw);
650
651         /* use this reason, __ieee80211_resume will unblock it */
652         ieee80211_stop_queues_by_reason(hw,
653                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
654
655         schedule_work(&local->restart_work);
656 }
657 EXPORT_SYMBOL(ieee80211_restart_hw);
658
659 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
660                                         const struct ieee80211_ops *ops)
661 {
662         struct ieee80211_local *local;
663         int priv_size, i;
664         struct wiphy *wiphy;
665
666         /* Ensure 32-byte alignment of our private data and hw private data.
667          * We use the wiphy priv data for both our ieee80211_local and for
668          * the driver's private data
669          *
670          * In memory it'll be like this:
671          *
672          * +-------------------------+
673          * | struct wiphy           |
674          * +-------------------------+
675          * | struct ieee80211_local  |
676          * +-------------------------+
677          * | driver's private data   |
678          * +-------------------------+
679          *
680          */
681         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
682
683         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
684
685         if (!wiphy)
686                 return NULL;
687
688         wiphy->privid = mac80211_wiphy_privid;
689
690         /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
691         wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
692                                sizeof(struct cfg80211_bss);
693
694         local = wiphy_priv(wiphy);
695
696         local->hw.wiphy = wiphy;
697
698         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
699
700         BUG_ON(!ops->tx);
701         BUG_ON(!ops->start);
702         BUG_ON(!ops->stop);
703         BUG_ON(!ops->config);
704         BUG_ON(!ops->add_interface);
705         BUG_ON(!ops->remove_interface);
706         BUG_ON(!ops->configure_filter);
707         local->ops = ops;
708
709         /* set up some defaults */
710         local->hw.queues = 1;
711         local->hw.max_rates = 1;
712         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
713         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
714         local->hw.conf.radio_enabled = true;
715         local->user_power_level = -1;
716
717         INIT_LIST_HEAD(&local->interfaces);
718         mutex_init(&local->iflist_mtx);
719         mutex_init(&local->scan_mtx);
720
721         spin_lock_init(&local->key_lock);
722
723         spin_lock_init(&local->queue_stop_reason_lock);
724
725         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
726
727         INIT_WORK(&local->restart_work, ieee80211_restart_work);
728
729         INIT_WORK(&local->dynamic_ps_enable_work,
730                   ieee80211_dynamic_ps_enable_work);
731         INIT_WORK(&local->dynamic_ps_disable_work,
732                   ieee80211_dynamic_ps_disable_work);
733         setup_timer(&local->dynamic_ps_timer,
734                     ieee80211_dynamic_ps_timer, (unsigned long) local);
735
736         sta_info_init(local);
737
738         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
739                 skb_queue_head_init(&local->pending[i]);
740         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
741                      (unsigned long)local);
742         tasklet_disable(&local->tx_pending_tasklet);
743
744         tasklet_init(&local->tasklet,
745                      ieee80211_tasklet_handler,
746                      (unsigned long) local);
747         tasklet_disable(&local->tasklet);
748
749         skb_queue_head_init(&local->skb_queue);
750         skb_queue_head_init(&local->skb_queue_unreliable);
751
752         spin_lock_init(&local->ampdu_lock);
753
754         return local_to_hw(local);
755 }
756 EXPORT_SYMBOL(ieee80211_alloc_hw);
757
758 static const struct net_device_ops ieee80211_master_ops = {
759         .ndo_start_xmit = ieee80211_master_start_xmit,
760         .ndo_open = ieee80211_master_open,
761         .ndo_stop = ieee80211_master_stop,
762         .ndo_set_multicast_list = ieee80211_master_set_multicast_list,
763         .ndo_select_queue = ieee80211_select_queue,
764 };
765
766 static void ieee80211_master_setup(struct net_device *mdev)
767 {
768         mdev->type = ARPHRD_IEEE80211;
769         mdev->netdev_ops = &ieee80211_master_ops;
770         mdev->header_ops = &ieee80211_header_ops;
771         mdev->tx_queue_len = 1000;
772         mdev->addr_len = ETH_ALEN;
773 }
774
775 int ieee80211_register_hw(struct ieee80211_hw *hw)
776 {
777         struct ieee80211_local *local = hw_to_local(hw);
778         int result;
779         enum ieee80211_band band;
780         struct net_device *mdev;
781         struct ieee80211_master_priv *mpriv;
782         int channels, i, j, max_bitrates;
783         bool supp_ht;
784         static const u32 cipher_suites[] = {
785                 WLAN_CIPHER_SUITE_WEP40,
786                 WLAN_CIPHER_SUITE_WEP104,
787                 WLAN_CIPHER_SUITE_TKIP,
788                 WLAN_CIPHER_SUITE_CCMP,
789
790                 /* keep last -- depends on hw flags! */
791                 WLAN_CIPHER_SUITE_AES_CMAC
792         };
793
794         /*
795          * generic code guarantees at least one band,
796          * set this very early because much code assumes
797          * that hw.conf.channel is assigned
798          */
799         channels = 0;
800         max_bitrates = 0;
801         supp_ht = false;
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                         continue;
808                 if (!local->oper_channel) {
809                         /* init channel we're on */
810                         local->hw.conf.channel =
811                         local->oper_channel = &sband->channels[0];
812                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
813                 }
814                 channels += sband->n_channels;
815
816                 if (max_bitrates < sband->n_bitrates)
817                         max_bitrates = sband->n_bitrates;
818                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
819         }
820
821         local->int_scan_req.n_channels = channels;
822         local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
823         if (!local->int_scan_req.channels)
824                 return -ENOMEM;
825
826         /* if low-level driver supports AP, we also support VLAN */
827         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
828                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
829
830         /* mac80211 always supports monitor */
831         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
832
833         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
834                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
835         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
836                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
837
838         /*
839          * Calculate scan IE length -- we need this to alloc
840          * memory and to subtract from the driver limit. It
841          * includes the (extended) supported rates and HT
842          * information -- SSID is the driver's responsibility.
843          */
844         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
845         if (supp_ht)
846                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
847
848         if (!local->ops->hw_scan) {
849                 /* For hw_scan, driver needs to set these up. */
850                 local->hw.wiphy->max_scan_ssids = 4;
851                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
852         }
853
854         /*
855          * If the driver supports any scan IEs, then assume the
856          * limit includes the IEs mac80211 will add, otherwise
857          * leave it at zero and let the driver sort it out; we
858          * still pass our IEs to the driver but userspace will
859          * not be allowed to in that case.
860          */
861         if (local->hw.wiphy->max_scan_ie_len)
862                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
863
864         local->hw.wiphy->cipher_suites = cipher_suites;
865         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
866         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
867                 local->hw.wiphy->n_cipher_suites--;
868
869         result = wiphy_register(local->hw.wiphy);
870         if (result < 0)
871                 goto fail_wiphy_register;
872
873         /*
874          * We use the number of queues for feature tests (QoS, HT) internally
875          * so restrict them appropriately.
876          */
877         if (hw->queues > IEEE80211_MAX_QUEUES)
878                 hw->queues = IEEE80211_MAX_QUEUES;
879
880         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
881                                "wmaster%d", ieee80211_master_setup,
882                                hw->queues);
883         if (!mdev)
884                 goto fail_mdev_alloc;
885
886         mpriv = netdev_priv(mdev);
887         mpriv->local = local;
888         local->mdev = mdev;
889
890         local->hw.workqueue =
891                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
892         if (!local->hw.workqueue) {
893                 result = -ENOMEM;
894                 goto fail_workqueue;
895         }
896
897         /*
898          * The hardware needs headroom for sending the frame,
899          * and we need some headroom for passing the frame to monitor
900          * interfaces, but never both at the same time.
901          */
902         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
903                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
904
905         debugfs_hw_add(local);
906
907         if (local->hw.max_listen_interval == 0)
908                 local->hw.max_listen_interval = 1;
909
910         local->hw.conf.listen_interval = local->hw.max_listen_interval;
911
912         result = sta_info_start(local);
913         if (result < 0)
914                 goto fail_sta_info;
915
916         result = ieee80211_wep_init(local);
917         if (result < 0) {
918                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
919                        wiphy_name(local->hw.wiphy), result);
920                 goto fail_wep;
921         }
922
923         rtnl_lock();
924         result = dev_alloc_name(local->mdev, local->mdev->name);
925         if (result < 0)
926                 goto fail_dev;
927
928         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
929         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
930         local->mdev->features |= NETIF_F_NETNS_LOCAL;
931
932         result = register_netdevice(local->mdev);
933         if (result < 0)
934                 goto fail_dev;
935
936         result = ieee80211_init_rate_ctrl_alg(local,
937                                               hw->rate_control_algorithm);
938         if (result < 0) {
939                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
940                        "algorithm\n", wiphy_name(local->hw.wiphy));
941                 goto fail_rate;
942         }
943
944         /* add one default STA interface if supported */
945         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
946                 result = ieee80211_if_add(local, "wlan%d", NULL,
947                                           NL80211_IFTYPE_STATION, NULL);
948                 if (result)
949                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
950                                wiphy_name(local->hw.wiphy));
951         }
952
953         rtnl_unlock();
954
955         ieee80211_led_init(local);
956
957         /* alloc internal scan request */
958         i = 0;
959         local->int_scan_req.ssids = &local->scan_ssid;
960         local->int_scan_req.n_ssids = 1;
961         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
962                 if (!hw->wiphy->bands[band])
963                         continue;
964                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
965                         local->int_scan_req.channels[i] =
966                                 &hw->wiphy->bands[band]->channels[j];
967                         i++;
968                 }
969         }
970
971         local->network_latency_notifier.notifier_call =
972                 ieee80211_max_network_latency;
973         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
974                                      &local->network_latency_notifier);
975
976         if (result) {
977                 rtnl_lock();
978                 goto fail_pm_qos;
979         }
980
981         return 0;
982
983  fail_pm_qos:
984         ieee80211_led_exit(local);
985         ieee80211_remove_interfaces(local);
986  fail_rate:
987         unregister_netdevice(local->mdev);
988         local->mdev = NULL;
989  fail_dev:
990         rtnl_unlock();
991         ieee80211_wep_free(local);
992  fail_wep:
993         sta_info_stop(local);
994  fail_sta_info:
995         debugfs_hw_del(local);
996         destroy_workqueue(local->hw.workqueue);
997  fail_workqueue:
998         if (local->mdev)
999                 free_netdev(local->mdev);
1000  fail_mdev_alloc:
1001         wiphy_unregister(local->hw.wiphy);
1002  fail_wiphy_register:
1003         kfree(local->int_scan_req.channels);
1004         return result;
1005 }
1006 EXPORT_SYMBOL(ieee80211_register_hw);
1007
1008 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1009 {
1010         struct ieee80211_local *local = hw_to_local(hw);
1011
1012         tasklet_kill(&local->tx_pending_tasklet);
1013         tasklet_kill(&local->tasklet);
1014
1015         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1016                                &local->network_latency_notifier);
1017
1018         rtnl_lock();
1019
1020         /*
1021          * At this point, interface list manipulations are fine
1022          * because the driver cannot be handing us frames any
1023          * more and the tasklet is killed.
1024          */
1025
1026         /* First, we remove all virtual interfaces. */
1027         ieee80211_remove_interfaces(local);
1028
1029         /* then, finally, remove the master interface */
1030         unregister_netdevice(local->mdev);
1031
1032         rtnl_unlock();
1033
1034         ieee80211_clear_tx_pending(local);
1035         sta_info_stop(local);
1036         rate_control_deinitialize(local);
1037         debugfs_hw_del(local);
1038
1039         if (skb_queue_len(&local->skb_queue)
1040                         || skb_queue_len(&local->skb_queue_unreliable))
1041                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1042                        wiphy_name(local->hw.wiphy));
1043         skb_queue_purge(&local->skb_queue);
1044         skb_queue_purge(&local->skb_queue_unreliable);
1045
1046         destroy_workqueue(local->hw.workqueue);
1047         wiphy_unregister(local->hw.wiphy);
1048         ieee80211_wep_free(local);
1049         ieee80211_led_exit(local);
1050         free_netdev(local->mdev);
1051         kfree(local->int_scan_req.channels);
1052 }
1053 EXPORT_SYMBOL(ieee80211_unregister_hw);
1054
1055 void ieee80211_free_hw(struct ieee80211_hw *hw)
1056 {
1057         struct ieee80211_local *local = hw_to_local(hw);
1058
1059         mutex_destroy(&local->iflist_mtx);
1060         mutex_destroy(&local->scan_mtx);
1061
1062         wiphy_free(local->hw.wiphy);
1063 }
1064 EXPORT_SYMBOL(ieee80211_free_hw);
1065
1066 static int __init ieee80211_init(void)
1067 {
1068         struct sk_buff *skb;
1069         int ret;
1070
1071         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1072         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1073                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1074
1075         ret = rc80211_minstrel_init();
1076         if (ret)
1077                 return ret;
1078
1079         ret = rc80211_pid_init();
1080         if (ret)
1081                 return ret;
1082
1083         ieee80211_debugfs_netdev_init();
1084
1085         return 0;
1086 }
1087
1088 static void __exit ieee80211_exit(void)
1089 {
1090         rc80211_pid_exit();
1091         rc80211_minstrel_exit();
1092
1093         /*
1094          * For key todo, it'll be empty by now but the work
1095          * might still be scheduled.
1096          */
1097         flush_scheduled_work();
1098
1099         if (mesh_allocated)
1100                 ieee80211s_stop();
1101
1102         ieee80211_debugfs_netdev_exit();
1103 }
1104
1105
1106 subsys_initcall(ieee80211_init);
1107 module_exit(ieee80211_exit);
1108
1109 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1110 MODULE_LICENSE("GPL");