mac80211/drivers: rewrite the rate control API
[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 <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                 conf.ssid = sdata->u.sta.ssid;
177                 conf.ssid_len = sdata->u.sta.ssid_len;
178         } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
179                 conf.bssid = sdata->dev->dev_addr;
180                 conf.ssid = sdata->u.ap.ssid;
181                 conf.ssid_len = sdata->u.ap.ssid_len;
182         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
183                 u8 zero[ETH_ALEN] = { 0 };
184                 conf.bssid = zero;
185                 conf.ssid = zero;
186                 conf.ssid_len = 0;
187         } else {
188                 WARN_ON(1);
189                 return -EINVAL;
190         }
191
192         if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
193                 return -EINVAL;
194
195         if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID)))
196                 return -EINVAL;
197
198         return local->ops->config_interface(local_to_hw(local),
199                                             &sdata->vif, &conf);
200 }
201
202 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
203 {
204         struct ieee80211_channel *chan;
205         int ret = 0;
206         int power;
207
208         might_sleep();
209
210         if (local->sw_scanning)
211                 chan = local->scan_channel;
212         else
213                 chan = local->oper_channel;
214
215         if (chan != local->hw.conf.channel) {
216                 local->hw.conf.channel = chan;
217                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
218         }
219
220
221         if (!local->hw.conf.power_level)
222                 power = chan->max_power;
223         else
224                 power = min(chan->max_power, local->hw.conf.power_level);
225         if (local->hw.conf.power_level != power) {
226                 changed |= IEEE80211_CONF_CHANGE_POWER;
227                 local->hw.conf.power_level = power;
228         }
229
230         if (changed && local->open_count) {
231                 ret = local->ops->config(local_to_hw(local), changed);
232                 /*
233                  * HW reconfiguration should never fail, the driver has told
234                  * us what it can support so it should live up to that promise.
235                  */
236                 WARN_ON(ret);
237         }
238
239         return ret;
240 }
241
242 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
243                                       u32 changed)
244 {
245         struct ieee80211_local *local = sdata->local;
246
247         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
248                 return;
249
250         if (!changed)
251                 return;
252
253         if (local->ops->bss_info_changed)
254                 local->ops->bss_info_changed(local_to_hw(local),
255                                              &sdata->vif,
256                                              &sdata->vif.bss_conf,
257                                              changed);
258 }
259
260 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
261 {
262         sdata->vif.bss_conf.use_cts_prot = false;
263         sdata->vif.bss_conf.use_short_preamble = false;
264         sdata->vif.bss_conf.use_short_slot = false;
265         return BSS_CHANGED_ERP_CTS_PROT |
266                BSS_CHANGED_ERP_PREAMBLE |
267                BSS_CHANGED_ERP_SLOT;
268 }
269
270 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
271                                  struct sk_buff *skb)
272 {
273         struct ieee80211_local *local = hw_to_local(hw);
274         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
275         int tmp;
276
277         skb->dev = local->mdev;
278         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
279         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
280                        &local->skb_queue : &local->skb_queue_unreliable, skb);
281         tmp = skb_queue_len(&local->skb_queue) +
282                 skb_queue_len(&local->skb_queue_unreliable);
283         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
284                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
285                 dev_kfree_skb_irq(skb);
286                 tmp--;
287                 I802_DEBUG_INC(local->tx_status_drop);
288         }
289         tasklet_schedule(&local->tasklet);
290 }
291 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
292
293 static void ieee80211_tasklet_handler(unsigned long data)
294 {
295         struct ieee80211_local *local = (struct ieee80211_local *) data;
296         struct sk_buff *skb;
297         struct ieee80211_rx_status rx_status;
298         struct ieee80211_ra_tid *ra_tid;
299
300         while ((skb = skb_dequeue(&local->skb_queue)) ||
301                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
302                 switch (skb->pkt_type) {
303                 case IEEE80211_RX_MSG:
304                         /* status is in skb->cb */
305                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
306                         /* Clear skb->pkt_type in order to not confuse kernel
307                          * netstack. */
308                         skb->pkt_type = 0;
309                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
310                         break;
311                 case IEEE80211_TX_STATUS_MSG:
312                         skb->pkt_type = 0;
313                         ieee80211_tx_status(local_to_hw(local), skb);
314                         break;
315                 case IEEE80211_DELBA_MSG:
316                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
317                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
318                                                 ra_tid->ra, ra_tid->tid);
319                         dev_kfree_skb(skb);
320                         break;
321                 case IEEE80211_ADDBA_MSG:
322                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
323                         ieee80211_start_tx_ba_cb(local_to_hw(local),
324                                                  ra_tid->ra, ra_tid->tid);
325                         dev_kfree_skb(skb);
326                         break ;
327                 default:
328                         WARN_ON(1);
329                         dev_kfree_skb(skb);
330                         break;
331                 }
332         }
333 }
334
335 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
336  * make a prepared TX frame (one that has been given to hw) to look like brand
337  * new IEEE 802.11 frame that is ready to go through TX processing again.
338  */
339 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
340                                       struct ieee80211_key *key,
341                                       struct sk_buff *skb)
342 {
343         unsigned int hdrlen, iv_len, mic_len;
344         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
345
346         hdrlen = ieee80211_hdrlen(hdr->frame_control);
347
348         if (!key)
349                 goto no_key;
350
351         switch (key->conf.alg) {
352         case ALG_WEP:
353                 iv_len = WEP_IV_LEN;
354                 mic_len = WEP_ICV_LEN;
355                 break;
356         case ALG_TKIP:
357                 iv_len = TKIP_IV_LEN;
358                 mic_len = TKIP_ICV_LEN;
359                 break;
360         case ALG_CCMP:
361                 iv_len = CCMP_HDR_LEN;
362                 mic_len = CCMP_MIC_LEN;
363                 break;
364         default:
365                 goto no_key;
366         }
367
368         if (skb->len >= hdrlen + mic_len &&
369             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
370                 skb_trim(skb, skb->len - mic_len);
371         if (skb->len >= hdrlen + iv_len) {
372                 memmove(skb->data + iv_len, skb->data, hdrlen);
373                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
374         }
375
376 no_key:
377         if (ieee80211_is_data_qos(hdr->frame_control)) {
378                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
379                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
380                         hdrlen - IEEE80211_QOS_CTL_LEN);
381                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
382         }
383 }
384
385 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
386                                             struct sta_info *sta,
387                                             struct sk_buff *skb)
388 {
389         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
390
391         sta->tx_filtered_count++;
392
393         /*
394          * Clear the TX filter mask for this STA when sending the next
395          * packet. If the STA went to power save mode, this will happen
396          * when it wakes up for the next time.
397          */
398         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
399
400         /*
401          * This code races in the following way:
402          *
403          *  (1) STA sends frame indicating it will go to sleep and does so
404          *  (2) hardware/firmware adds STA to filter list, passes frame up
405          *  (3) hardware/firmware processes TX fifo and suppresses a frame
406          *  (4) we get TX status before having processed the frame and
407          *      knowing that the STA has gone to sleep.
408          *
409          * This is actually quite unlikely even when both those events are
410          * processed from interrupts coming in quickly after one another or
411          * even at the same time because we queue both TX status events and
412          * RX frames to be processed by a tasklet and process them in the
413          * same order that they were received or TX status last. Hence, there
414          * is no race as long as the frame RX is processed before the next TX
415          * status, which drivers can ensure, see below.
416          *
417          * Note that this can only happen if the hardware or firmware can
418          * actually add STAs to the filter list, if this is done by the
419          * driver in response to set_tim() (which will only reduce the race
420          * this whole filtering tries to solve, not completely solve it)
421          * this situation cannot happen.
422          *
423          * To completely solve this race drivers need to make sure that they
424          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
425          *      functions and
426          *  (b) always process RX events before TX status events if ordering
427          *      can be unknown, for example with different interrupt status
428          *      bits.
429          */
430         if (test_sta_flags(sta, WLAN_STA_PS) &&
431             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
432                 ieee80211_remove_tx_extra(local, sta->key, skb);
433                 skb_queue_tail(&sta->tx_filtered, skb);
434                 return;
435         }
436
437         if (!test_sta_flags(sta, WLAN_STA_PS) &&
438             !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
439                 /* Software retry the packet once */
440                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
441                 ieee80211_remove_tx_extra(local, sta->key, skb);
442                 dev_queue_xmit(skb);
443                 return;
444         }
445
446 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
447         if (net_ratelimit())
448                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
449                        "queue_len=%d PS=%d @%lu\n",
450                        wiphy_name(local->hw.wiphy),
451                        skb_queue_len(&sta->tx_filtered),
452                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
453 #endif
454         dev_kfree_skb(skb);
455 }
456
457 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
458 {
459         struct sk_buff *skb2;
460         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
461         struct ieee80211_local *local = hw_to_local(hw);
462         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
463         u16 frag, type;
464         __le16 fc;
465         struct ieee80211_supported_band *sband;
466         struct ieee80211_tx_status_rtap_hdr *rthdr;
467         struct ieee80211_sub_if_data *sdata;
468         struct net_device *prev_dev = NULL;
469         struct sta_info *sta;
470         int retry_count = -1, i;
471
472         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
473                 /* the HW cannot have attempted that rate */
474                 if (i >= hw->max_rates) {
475                         info->status.rates[i].idx = -1;
476                         info->status.rates[i].count = 0;
477                 }
478
479                 retry_count += info->status.rates[i].count;
480         }
481         if (retry_count < 0)
482                 retry_count = 0;
483
484         rcu_read_lock();
485
486         sband = local->hw.wiphy->bands[info->band];
487
488         sta = sta_info_get(local, hdr->addr1);
489
490         if (sta) {
491                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
492                     test_sta_flags(sta, WLAN_STA_PS)) {
493                         /*
494                          * The STA is in power save mode, so assume
495                          * that this TX packet failed because of that.
496                          */
497                         ieee80211_handle_filtered_frame(local, sta, skb);
498                         rcu_read_unlock();
499                         return;
500                 }
501
502                 fc = hdr->frame_control;
503
504                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
505                     (ieee80211_is_data_qos(fc))) {
506                         u16 tid, ssn;
507                         u8 *qc;
508
509                         qc = ieee80211_get_qos_ctl(hdr);
510                         tid = qc[0] & 0xf;
511                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
512                                                 & IEEE80211_SCTL_SEQ);
513                         ieee80211_send_bar(sta->sdata, hdr->addr1,
514                                            tid, ssn);
515                 }
516
517                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
518                         ieee80211_handle_filtered_frame(local, sta, skb);
519                         rcu_read_unlock();
520                         return;
521                 } else {
522                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
523                                 sta->tx_retry_failed++;
524                         sta->tx_retry_count += retry_count;
525                 }
526
527                 rate_control_tx_status(local, sband, sta, skb);
528         }
529
530         rcu_read_unlock();
531
532         ieee80211_led_tx(local, 0);
533
534         /* SNMP counters
535          * Fragments are passed to low-level drivers as separate skbs, so these
536          * are actually fragments, not frames. Update frame counters only for
537          * the first fragment of the frame. */
538
539         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
540         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
541
542         if (info->flags & IEEE80211_TX_STAT_ACK) {
543                 if (frag == 0) {
544                         local->dot11TransmittedFrameCount++;
545                         if (is_multicast_ether_addr(hdr->addr1))
546                                 local->dot11MulticastTransmittedFrameCount++;
547                         if (retry_count > 0)
548                                 local->dot11RetryCount++;
549                         if (retry_count > 1)
550                                 local->dot11MultipleRetryCount++;
551                 }
552
553                 /* This counter shall be incremented for an acknowledged MPDU
554                  * with an individual address in the address 1 field or an MPDU
555                  * with a multicast address in the address 1 field of type Data
556                  * or Management. */
557                 if (!is_multicast_ether_addr(hdr->addr1) ||
558                     type == IEEE80211_FTYPE_DATA ||
559                     type == IEEE80211_FTYPE_MGMT)
560                         local->dot11TransmittedFragmentCount++;
561         } else {
562                 if (frag == 0)
563                         local->dot11FailedCount++;
564         }
565
566         /* this was a transmitted frame, but now we want to reuse it */
567         skb_orphan(skb);
568
569         /*
570          * This is a bit racy but we can avoid a lot of work
571          * with this test...
572          */
573         if (!local->monitors && !local->cooked_mntrs) {
574                 dev_kfree_skb(skb);
575                 return;
576         }
577
578         /* send frame to monitor interfaces now */
579
580         if (skb_headroom(skb) < sizeof(*rthdr)) {
581                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
582                 dev_kfree_skb(skb);
583                 return;
584         }
585
586         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
587                                 skb_push(skb, sizeof(*rthdr));
588
589         memset(rthdr, 0, sizeof(*rthdr));
590         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
591         rthdr->hdr.it_present =
592                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
593                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
594                             (1 << IEEE80211_RADIOTAP_RATE));
595
596         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
597             !is_multicast_ether_addr(hdr->addr1))
598                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
599
600         /*
601          * XXX: Once radiotap gets the bitmap reset thing the vendor
602          *      extensions proposal contains, we can actually report
603          *      the whole set of tries we did.
604          */
605         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
606             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
607                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
608         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
609                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
610         if (info->status.rates[0].idx >= 0 &&
611             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
612                 rthdr->rate = sband->bitrates[
613                                 info->status.rates[0].idx].bitrate / 5;
614
615         /* for now report the total retry_count */
616         rthdr->data_retries = retry_count;
617
618         /* XXX: is this sufficient for BPF? */
619         skb_set_mac_header(skb, 0);
620         skb->ip_summed = CHECKSUM_UNNECESSARY;
621         skb->pkt_type = PACKET_OTHERHOST;
622         skb->protocol = htons(ETH_P_802_2);
623         memset(skb->cb, 0, sizeof(skb->cb));
624
625         rcu_read_lock();
626         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
627                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
628                         if (!netif_running(sdata->dev))
629                                 continue;
630
631                         if (prev_dev) {
632                                 skb2 = skb_clone(skb, GFP_ATOMIC);
633                                 if (skb2) {
634                                         skb2->dev = prev_dev;
635                                         netif_rx(skb2);
636                                 }
637                         }
638
639                         prev_dev = sdata->dev;
640                 }
641         }
642         if (prev_dev) {
643                 skb->dev = prev_dev;
644                 netif_rx(skb);
645                 skb = NULL;
646         }
647         rcu_read_unlock();
648         dev_kfree_skb(skb);
649 }
650 EXPORT_SYMBOL(ieee80211_tx_status);
651
652 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
653                                         const struct ieee80211_ops *ops)
654 {
655         struct ieee80211_local *local;
656         int priv_size;
657         struct wiphy *wiphy;
658
659         /* Ensure 32-byte alignment of our private data and hw private data.
660          * We use the wiphy priv data for both our ieee80211_local and for
661          * the driver's private data
662          *
663          * In memory it'll be like this:
664          *
665          * +-------------------------+
666          * | struct wiphy           |
667          * +-------------------------+
668          * | struct ieee80211_local  |
669          * +-------------------------+
670          * | driver's private data   |
671          * +-------------------------+
672          *
673          */
674         priv_size = ((sizeof(struct ieee80211_local) +
675                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
676                     priv_data_len;
677
678         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
679
680         if (!wiphy)
681                 return NULL;
682
683         wiphy->privid = mac80211_wiphy_privid;
684
685         local = wiphy_priv(wiphy);
686         local->hw.wiphy = wiphy;
687
688         local->hw.priv = (char *)local +
689                          ((sizeof(struct ieee80211_local) +
690                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
691
692         BUG_ON(!ops->tx);
693         BUG_ON(!ops->start);
694         BUG_ON(!ops->stop);
695         BUG_ON(!ops->config);
696         BUG_ON(!ops->add_interface);
697         BUG_ON(!ops->remove_interface);
698         BUG_ON(!ops->configure_filter);
699         local->ops = ops;
700
701         /* set up some defaults */
702         local->hw.queues = 1;
703         local->hw.max_rates = 1;
704         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
705         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
706         local->hw.conf.long_frame_max_tx_count = 4;
707         local->hw.conf.short_frame_max_tx_count = 7;
708         local->hw.conf.radio_enabled = true;
709
710         INIT_LIST_HEAD(&local->interfaces);
711
712         spin_lock_init(&local->key_lock);
713
714         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
715
716         sta_info_init(local);
717
718         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
719                      (unsigned long)local);
720         tasklet_disable(&local->tx_pending_tasklet);
721
722         tasklet_init(&local->tasklet,
723                      ieee80211_tasklet_handler,
724                      (unsigned long) local);
725         tasklet_disable(&local->tasklet);
726
727         skb_queue_head_init(&local->skb_queue);
728         skb_queue_head_init(&local->skb_queue_unreliable);
729
730         return local_to_hw(local);
731 }
732 EXPORT_SYMBOL(ieee80211_alloc_hw);
733
734 int ieee80211_register_hw(struct ieee80211_hw *hw)
735 {
736         struct ieee80211_local *local = hw_to_local(hw);
737         const char *name;
738         int result;
739         enum ieee80211_band band;
740         struct net_device *mdev;
741         struct ieee80211_master_priv *mpriv;
742
743         /*
744          * generic code guarantees at least one band,
745          * set this very early because much code assumes
746          * that hw.conf.channel is assigned
747          */
748         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
749                 struct ieee80211_supported_band *sband;
750
751                 sband = local->hw.wiphy->bands[band];
752                 if (sband) {
753                         /* init channel we're on */
754                         local->hw.conf.channel =
755                         local->oper_channel =
756                         local->scan_channel = &sband->channels[0];
757                         break;
758                 }
759         }
760
761         /* if low-level driver supports AP, we also support VLAN */
762         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
763                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
764
765         /* mac80211 always supports monitor */
766         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
767
768         result = wiphy_register(local->hw.wiphy);
769         if (result < 0)
770                 return result;
771
772         /*
773          * We use the number of queues for feature tests (QoS, HT) internally
774          * so restrict them appropriately.
775          */
776         if (hw->queues > IEEE80211_MAX_QUEUES)
777                 hw->queues = IEEE80211_MAX_QUEUES;
778         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
779                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
780         if (hw->queues < 4)
781                 hw->ampdu_queues = 0;
782
783         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
784                                "wmaster%d", ether_setup,
785                                ieee80211_num_queues(hw));
786         if (!mdev)
787                 goto fail_mdev_alloc;
788
789         mpriv = netdev_priv(mdev);
790         mpriv->local = local;
791         local->mdev = mdev;
792
793         ieee80211_rx_bss_list_init(local);
794
795         mdev->hard_start_xmit = ieee80211_master_start_xmit;
796         mdev->open = ieee80211_master_open;
797         mdev->stop = ieee80211_master_stop;
798         mdev->type = ARPHRD_IEEE80211;
799         mdev->header_ops = &ieee80211_header_ops;
800         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
801
802         name = wiphy_dev(local->hw.wiphy)->driver->name;
803         local->hw.workqueue = create_freezeable_workqueue(name);
804         if (!local->hw.workqueue) {
805                 result = -ENOMEM;
806                 goto fail_workqueue;
807         }
808
809         /*
810          * The hardware needs headroom for sending the frame,
811          * and we need some headroom for passing the frame to monitor
812          * interfaces, but never both at the same time.
813          */
814         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
815                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
816
817         debugfs_hw_add(local);
818
819         if (local->hw.conf.beacon_int < 10)
820                 local->hw.conf.beacon_int = 100;
821
822         if (local->hw.max_listen_interval == 0)
823                 local->hw.max_listen_interval = 1;
824
825         local->hw.conf.listen_interval = local->hw.max_listen_interval;
826
827         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
828                                                   IEEE80211_HW_SIGNAL_DB |
829                                                   IEEE80211_HW_SIGNAL_DBM) ?
830                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
831         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
832                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
833         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
834                 local->wstats_flags |= IW_QUAL_DBM;
835
836         result = sta_info_start(local);
837         if (result < 0)
838                 goto fail_sta_info;
839
840         rtnl_lock();
841         result = dev_alloc_name(local->mdev, local->mdev->name);
842         if (result < 0)
843                 goto fail_dev;
844
845         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
846         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
847
848         result = register_netdevice(local->mdev);
849         if (result < 0)
850                 goto fail_dev;
851
852         result = ieee80211_init_rate_ctrl_alg(local,
853                                               hw->rate_control_algorithm);
854         if (result < 0) {
855                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
856                        "algorithm\n", wiphy_name(local->hw.wiphy));
857                 goto fail_rate;
858         }
859
860         result = ieee80211_wep_init(local);
861
862         if (result < 0) {
863                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
864                        wiphy_name(local->hw.wiphy), result);
865                 goto fail_wep;
866         }
867
868         local->mdev->select_queue = ieee80211_select_queue;
869
870         /* add one default STA interface */
871         result = ieee80211_if_add(local, "wlan%d", NULL,
872                                   NL80211_IFTYPE_STATION, NULL);
873         if (result)
874                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
875                        wiphy_name(local->hw.wiphy));
876
877         rtnl_unlock();
878
879         ieee80211_led_init(local);
880
881         return 0;
882
883 fail_wep:
884         rate_control_deinitialize(local);
885 fail_rate:
886         unregister_netdevice(local->mdev);
887         local->mdev = NULL;
888 fail_dev:
889         rtnl_unlock();
890         sta_info_stop(local);
891 fail_sta_info:
892         debugfs_hw_del(local);
893         destroy_workqueue(local->hw.workqueue);
894 fail_workqueue:
895         if (local->mdev)
896                 free_netdev(local->mdev);
897 fail_mdev_alloc:
898         wiphy_unregister(local->hw.wiphy);
899         return result;
900 }
901 EXPORT_SYMBOL(ieee80211_register_hw);
902
903 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
904 {
905         struct ieee80211_local *local = hw_to_local(hw);
906
907         tasklet_kill(&local->tx_pending_tasklet);
908         tasklet_kill(&local->tasklet);
909
910         rtnl_lock();
911
912         /*
913          * At this point, interface list manipulations are fine
914          * because the driver cannot be handing us frames any
915          * more and the tasklet is killed.
916          */
917
918         /* First, we remove all virtual interfaces. */
919         ieee80211_remove_interfaces(local);
920
921         /* then, finally, remove the master interface */
922         unregister_netdevice(local->mdev);
923
924         rtnl_unlock();
925
926         ieee80211_rx_bss_list_deinit(local);
927         ieee80211_clear_tx_pending(local);
928         sta_info_stop(local);
929         rate_control_deinitialize(local);
930         debugfs_hw_del(local);
931
932         if (skb_queue_len(&local->skb_queue)
933                         || skb_queue_len(&local->skb_queue_unreliable))
934                 printk(KERN_WARNING "%s: skb_queue not empty\n",
935                        wiphy_name(local->hw.wiphy));
936         skb_queue_purge(&local->skb_queue);
937         skb_queue_purge(&local->skb_queue_unreliable);
938
939         destroy_workqueue(local->hw.workqueue);
940         wiphy_unregister(local->hw.wiphy);
941         ieee80211_wep_free(local);
942         ieee80211_led_exit(local);
943         free_netdev(local->mdev);
944 }
945 EXPORT_SYMBOL(ieee80211_unregister_hw);
946
947 void ieee80211_free_hw(struct ieee80211_hw *hw)
948 {
949         struct ieee80211_local *local = hw_to_local(hw);
950
951         wiphy_free(local->hw.wiphy);
952 }
953 EXPORT_SYMBOL(ieee80211_free_hw);
954
955 static int __init ieee80211_init(void)
956 {
957         struct sk_buff *skb;
958         int ret;
959
960         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
961         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
962                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
963
964         ret = rc80211_minstrel_init();
965         if (ret)
966                 return ret;
967
968         ret = rc80211_pid_init();
969         if (ret)
970                 return ret;
971
972         ieee80211_debugfs_netdev_init();
973
974         return 0;
975 }
976
977 static void __exit ieee80211_exit(void)
978 {
979         rc80211_pid_exit();
980         rc80211_minstrel_exit();
981
982         /*
983          * For key todo, it'll be empty by now but the work
984          * might still be scheduled.
985          */
986         flush_scheduled_work();
987
988         if (mesh_allocated)
989                 ieee80211s_stop();
990
991         ieee80211_debugfs_netdev_exit();
992 }
993
994
995 subsys_initcall(ieee80211_init);
996 module_exit(ieee80211_exit);
997
998 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
999 MODULE_LICENSE("GPL");