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mac80211: atomically check whether STA exists already
[linux-2.6/openmoko-kernel/knife-kernel.git] / net / mac80211 / ieee80211.c
blobf82ebdd53d485e5e8c39dab5d2f5481627a0b7df
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 "ieee80211_rate.h"
29 #include "wep.h"
30 #include "wme.h"
31 #include "aes_ccm.h"
32 #include "ieee80211_led.h"
33 #include "cfg.h"
34 #include "debugfs.h"
35 #include "debugfs_netdev.h"
36
37 #define SUPP_MCS_SET_LEN 16
38
39 /*
40 * For seeing transmitted packets on monitor interfaces
41 * we have a radiotap header too.
42 */
43 struct ieee80211_tx_status_rtap_hdr {
44 struct ieee80211_radiotap_header hdr;
45 __le16 tx_flags;
46 u8 data_retries;
47 } __attribute__ ((packed));
48
49 /* common interface routines */
50
51 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
52 {
53 memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
54 return ETH_ALEN;
55 }
56
57 /* must be called under mdev tx lock */
58 static void ieee80211_configure_filter(struct ieee80211_local *local)
59 {
60 unsigned int changed_flags;
61 unsigned int new_flags = 0;
62
63 if (atomic_read(&local->iff_promiscs))
64 new_flags |= FIF_PROMISC_IN_BSS;
65
66 if (atomic_read(&local->iff_allmultis))
67 new_flags |= FIF_ALLMULTI;
68
69 if (local->monitors)
70 new_flags |= FIF_BCN_PRBRESP_PROMISC;
71
72 if (local->fif_fcsfail)
73 new_flags |= FIF_FCSFAIL;
74
75 if (local->fif_plcpfail)
76 new_flags |= FIF_PLCPFAIL;
77
78 if (local->fif_control)
79 new_flags |= FIF_CONTROL;
80
81 if (local->fif_other_bss)
82 new_flags |= FIF_OTHER_BSS;
83
84 changed_flags = local->filter_flags ^ new_flags;
85
86 /* be a bit nasty */
87 new_flags |= (1<<31);
88
89 local->ops->configure_filter(local_to_hw(local),
90 changed_flags, &new_flags,
91 local->mdev->mc_count,
92 local->mdev->mc_list);
93
94 WARN_ON(new_flags & (1<<31));
95
96 local->filter_flags = new_flags & ~(1<<31);
97 }
98
99 /* master interface */
100
101 static int ieee80211_master_open(struct net_device *dev)
102 {
103 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
104 struct ieee80211_sub_if_data *sdata;
105 int res = -EOPNOTSUPP;
106
107 /* we hold the RTNL here so can safely walk the list */
108 list_for_each_entry(sdata, &local->interfaces, list) {
109 if (sdata->dev != dev && netif_running(sdata->dev)) {
110 res = 0;
111 break;
112 }
113 }
114 return res;
115 }
116
117 static int ieee80211_master_stop(struct net_device *dev)
118 {
119 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
120 struct ieee80211_sub_if_data *sdata;
121
122 /* we hold the RTNL here so can safely walk the list */
123 list_for_each_entry(sdata, &local->interfaces, list)
124 if (sdata->dev != dev && netif_running(sdata->dev))
125 dev_close(sdata->dev);
126
127 return 0;
128 }
129
130 static void ieee80211_master_set_multicast_list(struct net_device *dev)
131 {
132 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
133
134 ieee80211_configure_filter(local);
135 }
136
137 /* regular interfaces */
138
139 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
140 {
141 /* FIX: what would be proper limits for MTU?
142 * This interface uses 802.3 frames. */
143 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6) {
144 printk(KERN_WARNING "%s: invalid MTU %d\n",
145 dev->name, new_mtu);
146 return -EINVAL;
147 }
148
149 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
150 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
151 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
152 dev->mtu = new_mtu;
153 return 0;
154 }
155
156 static inline int identical_mac_addr_allowed(int type1, int type2)
157 {
158 return (type1 == IEEE80211_IF_TYPE_MNTR ||
159 type2 == IEEE80211_IF_TYPE_MNTR ||
160 (type1 == IEEE80211_IF_TYPE_AP &&
161 type2 == IEEE80211_IF_TYPE_WDS) ||
162 (type1 == IEEE80211_IF_TYPE_WDS &&
163 (type2 == IEEE80211_IF_TYPE_WDS ||
164 type2 == IEEE80211_IF_TYPE_AP)) ||
165 (type1 == IEEE80211_IF_TYPE_AP &&
166 type2 == IEEE80211_IF_TYPE_VLAN) ||
167 (type1 == IEEE80211_IF_TYPE_VLAN &&
168 (type2 == IEEE80211_IF_TYPE_AP ||
169 type2 == IEEE80211_IF_TYPE_VLAN)));
170 }
171
172 static int ieee80211_open(struct net_device *dev)
173 {
174 struct ieee80211_sub_if_data *sdata, *nsdata;
175 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
176 struct ieee80211_if_init_conf conf;
177 int res;
178 bool need_hw_reconfig = 0;
179
180 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
181
182 /* we hold the RTNL here so can safely walk the list */
183 list_for_each_entry(nsdata, &local->interfaces, list) {
184 struct net_device *ndev = nsdata->dev;
185
186 if (ndev != dev && ndev != local->mdev && netif_running(ndev) &&
187 compare_ether_addr(dev->dev_addr, ndev->dev_addr) == 0) {
188 /*
189 * check whether it may have the same address
190 */
191 if (!identical_mac_addr_allowed(sdata->vif.type,
192 nsdata->vif.type))
193 return -ENOTUNIQ;
194
195 /*
196 * can only add VLANs to enabled APs
197 */
198 if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
199 nsdata->vif.type == IEEE80211_IF_TYPE_AP &&
200 netif_running(nsdata->dev))
201 sdata->u.vlan.ap = nsdata;
202 }
203 }
204
205 switch (sdata->vif.type) {
206 case IEEE80211_IF_TYPE_WDS:
207 if (is_zero_ether_addr(sdata->u.wds.remote_addr))
208 return -ENOLINK;
209 break;
210 case IEEE80211_IF_TYPE_VLAN:
211 if (!sdata->u.vlan.ap)
212 return -ENOLINK;
213 break;
214 case IEEE80211_IF_TYPE_AP:
215 case IEEE80211_IF_TYPE_STA:
216 case IEEE80211_IF_TYPE_MNTR:
217 case IEEE80211_IF_TYPE_IBSS:
218 /* no special treatment */
219 break;
220 case IEEE80211_IF_TYPE_INVALID:
221 /* cannot happen */
222 WARN_ON(1);
223 break;
224 }
225
226 if (local->open_count == 0) {
227 res = 0;
228 if (local->ops->start)
229 res = local->ops->start(local_to_hw(local));
230 if (res)
231 return res;
232 need_hw_reconfig = 1;
233 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
234 }
235
236 switch (sdata->vif.type) {
237 case IEEE80211_IF_TYPE_VLAN:
238 list_add(&sdata->u.vlan.list, &sdata->u.vlan.ap->u.ap.vlans);
239 /* no need to tell driver */
240 break;
241 case IEEE80211_IF_TYPE_MNTR:
242 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
243 local->cooked_mntrs++;
244 break;
245 }
246
247 /* must be before the call to ieee80211_configure_filter */
248 local->monitors++;
249 if (local->monitors == 1)
250 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
251
252 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
253 local->fif_fcsfail++;
254 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
255 local->fif_plcpfail++;
256 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
257 local->fif_control++;
258 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
259 local->fif_other_bss++;
260
261 netif_tx_lock_bh(local->mdev);
262 ieee80211_configure_filter(local);
263 netif_tx_unlock_bh(local->mdev);
264 break;
265 case IEEE80211_IF_TYPE_STA:
266 case IEEE80211_IF_TYPE_IBSS:
267 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
268 /* fall through */
269 default:
270 conf.vif = &sdata->vif;
271 conf.type = sdata->vif.type;
272 conf.mac_addr = dev->dev_addr;
273 res = local->ops->add_interface(local_to_hw(local), &conf);
274 if (res && !local->open_count && local->ops->stop)
275 local->ops->stop(local_to_hw(local));
276 if (res)
277 return res;
278
279 ieee80211_if_config(dev);
280 ieee80211_reset_erp_info(dev);
281 ieee80211_enable_keys(sdata);
282
283 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
284 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
285 netif_carrier_off(dev);
286 else
287 netif_carrier_on(dev);
288 }
289
290 if (local->open_count == 0) {
291 res = dev_open(local->mdev);
292 WARN_ON(res);
293 tasklet_enable(&local->tx_pending_tasklet);
294 tasklet_enable(&local->tasklet);
295 }
296
297 /*
298 * set_multicast_list will be invoked by the networking core
299 * which will check whether any increments here were done in
300 * error and sync them down to the hardware as filter flags.
301 */
302 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
303 atomic_inc(&local->iff_allmultis);
304
305 if (sdata->flags & IEEE80211_SDATA_PROMISC)
306 atomic_inc(&local->iff_promiscs);
307
308 local->open_count++;
309 if (need_hw_reconfig)
310 ieee80211_hw_config(local);
311
312 netif_start_queue(dev);
313
314 return 0;
315 }
316
317 static int ieee80211_stop(struct net_device *dev)
318 {
319 struct ieee80211_sub_if_data *sdata;
320 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
321 struct ieee80211_if_init_conf conf;
322 struct sta_info *sta;
323 int i;
324
325 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
326
327 list_for_each_entry(sta, &local->sta_list, list) {
328 if (sta->dev == dev)
329 for (i = 0; i < STA_TID_NUM; i++)
330 ieee80211_sta_stop_rx_ba_session(sta->dev,
331 sta->addr, i,
332 WLAN_BACK_RECIPIENT,
333 WLAN_REASON_QSTA_LEAVE_QBSS);
334 }
335
336 netif_stop_queue(dev);
337
338 /*
339 * Don't count this interface for promisc/allmulti while it
340 * is down. dev_mc_unsync() will invoke set_multicast_list
341 * on the master interface which will sync these down to the
342 * hardware as filter flags.
343 */
344 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
345 atomic_dec(&local->iff_allmultis);
346
347 if (sdata->flags & IEEE80211_SDATA_PROMISC)
348 atomic_dec(&local->iff_promiscs);
349
350 dev_mc_unsync(local->mdev, dev);
351
352 /* APs need special treatment */
353 if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
354 struct ieee80211_sub_if_data *vlan, *tmp;
355 struct beacon_data *old_beacon = sdata->u.ap.beacon;
356
357 /* remove beacon */
358 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
359 synchronize_rcu();
360 kfree(old_beacon);
361
362 /* down all dependent devices, that is VLANs */
363 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
364 u.vlan.list)
365 dev_close(vlan->dev);
366 WARN_ON(!list_empty(&sdata->u.ap.vlans));
367 }
368
369 local->open_count--;
370
371 switch (sdata->vif.type) {
372 case IEEE80211_IF_TYPE_VLAN:
373 list_del(&sdata->u.vlan.list);
374 sdata->u.vlan.ap = NULL;
375 /* no need to tell driver */
376 break;
377 case IEEE80211_IF_TYPE_MNTR:
378 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
379 local->cooked_mntrs--;
380 break;
381 }
382
383 local->monitors--;
384 if (local->monitors == 0)
385 local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
386
387 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
388 local->fif_fcsfail--;
389 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
390 local->fif_plcpfail--;
391 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
392 local->fif_control--;
393 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
394 local->fif_other_bss--;
395
396 netif_tx_lock_bh(local->mdev);
397 ieee80211_configure_filter(local);
398 netif_tx_unlock_bh(local->mdev);
399 break;
400 case IEEE80211_IF_TYPE_STA:
401 case IEEE80211_IF_TYPE_IBSS:
402 sdata->u.sta.state = IEEE80211_DISABLED;
403 del_timer_sync(&sdata->u.sta.timer);
404 /*
405 * When we get here, the interface is marked down.
406 * Call synchronize_rcu() to wait for the RX path
407 * should it be using the interface and enqueuing
408 * frames at this very time on another CPU.
409 */
410 synchronize_rcu();
411 skb_queue_purge(&sdata->u.sta.skb_queue);
412
413 if (local->scan_dev == sdata->dev) {
414 if (!local->ops->hw_scan) {
415 local->sta_sw_scanning = 0;
416 cancel_delayed_work(&local->scan_work);
417 } else
418 local->sta_hw_scanning = 0;
419 }
420
421 flush_workqueue(local->hw.workqueue);
422
423 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
424 kfree(sdata->u.sta.extra_ie);
425 sdata->u.sta.extra_ie = NULL;
426 sdata->u.sta.extra_ie_len = 0;
427 /* fall through */
428 default:
429 conf.vif = &sdata->vif;
430 conf.type = sdata->vif.type;
431 conf.mac_addr = dev->dev_addr;
432 /* disable all keys for as long as this netdev is down */
433 ieee80211_disable_keys(sdata);
434 local->ops->remove_interface(local_to_hw(local), &conf);
435 }
436
437 if (local->open_count == 0) {
438 if (netif_running(local->mdev))
439 dev_close(local->mdev);
440
441 if (local->ops->stop)
442 local->ops->stop(local_to_hw(local));
443
444 ieee80211_led_radio(local, 0);
445
446 tasklet_disable(&local->tx_pending_tasklet);
447 tasklet_disable(&local->tasklet);
448 }
449
450 return 0;
451 }
452
453 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
454 {
455 struct ieee80211_local *local = hw_to_local(hw);
456 struct sta_info *sta;
457 struct ieee80211_sub_if_data *sdata;
458 u16 start_seq_num = 0;
459 u8 *state;
460 int ret;
461 DECLARE_MAC_BUF(mac);
462
463 if (tid >= STA_TID_NUM)
464 return -EINVAL;
465
466 #ifdef CONFIG_MAC80211_HT_DEBUG
467 printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
468 print_mac(mac, ra), tid);
469 #endif /* CONFIG_MAC80211_HT_DEBUG */
470
471 sta = sta_info_get(local, ra);
472 if (!sta) {
473 printk(KERN_DEBUG "Could not find the station\n");
474 return -ENOENT;
475 }
476
477 spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
478
479 /* we have tried too many times, receiver does not want A-MPDU */
480 if (sta->ampdu_mlme.tid_tx[tid].addba_req_num > HT_AGG_MAX_RETRIES) {
481 ret = -EBUSY;
482 goto start_ba_exit;
483 }
484
485 state = &sta->ampdu_mlme.tid_tx[tid].state;
486 /* check if the TID is not in aggregation flow already */
487 if (*state != HT_AGG_STATE_IDLE) {
488 #ifdef CONFIG_MAC80211_HT_DEBUG
489 printk(KERN_DEBUG "BA request denied - session is not "
490 "idle on tid %u\n", tid);
491 #endif /* CONFIG_MAC80211_HT_DEBUG */
492 ret = -EAGAIN;
493 goto start_ba_exit;
494 }
495
496 /* ensure that TX flow won't interrupt us
497 * until the end of the call to requeue function */
498 spin_lock_bh(&local->mdev->queue_lock);
499
500 /* create a new queue for this aggregation */
501 ret = ieee80211_ht_agg_queue_add(local, sta, tid);
502
503 /* case no queue is available to aggregation
504 * don't switch to aggregation */
505 if (ret) {
506 #ifdef CONFIG_MAC80211_HT_DEBUG
507 printk(KERN_DEBUG "BA request denied - no queue available for"
508 " tid %d\n", tid);
509 #endif /* CONFIG_MAC80211_HT_DEBUG */
510 spin_unlock_bh(&local->mdev->queue_lock);
511 goto start_ba_exit;
512 }
513 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
514
515 /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
516 * call back right away, it must see that the flow has begun */
517 *state |= HT_ADDBA_REQUESTED_MSK;
518
519 if (local->ops->ampdu_action)
520 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
521 ra, tid, &start_seq_num);
522
523 if (ret) {
524 /* No need to requeue the packets in the agg queue, since we
525 * held the tx lock: no packet could be enqueued to the newly
526 * allocated queue */
527 ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
528 #ifdef CONFIG_MAC80211_HT_DEBUG
529 printk(KERN_DEBUG "BA request denied - HW or queue unavailable"
530 " for tid %d\n", tid);
531 #endif /* CONFIG_MAC80211_HT_DEBUG */
532 spin_unlock_bh(&local->mdev->queue_lock);
533 *state = HT_AGG_STATE_IDLE;
534 goto start_ba_exit;
535 }
536
537 /* Will put all the packets in the new SW queue */
538 ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
539 spin_unlock_bh(&local->mdev->queue_lock);
540
541 /* We have most probably almost emptied the legacy queue */
542 /* ieee80211_wake_queue(local_to_hw(local), ieee802_1d_to_ac[tid]); */
543
544 /* send an addBA request */
545 sta->ampdu_mlme.dialog_token_allocator++;
546 sta->ampdu_mlme.tid_tx[tid].dialog_token =
547 sta->ampdu_mlme.dialog_token_allocator;
548 sta->ampdu_mlme.tid_tx[tid].ssn = start_seq_num;
549
550 ieee80211_send_addba_request(sta->dev, ra, tid,
551 sta->ampdu_mlme.tid_tx[tid].dialog_token,
552 sta->ampdu_mlme.tid_tx[tid].ssn,
553 0x40, 5000);
554
555 /* activate the timer for the recipient's addBA response */
556 sta->ampdu_mlme.tid_tx[tid].addba_resp_timer.expires =
557 jiffies + ADDBA_RESP_INTERVAL;
558 add_timer(&sta->ampdu_mlme.tid_tx[tid].addba_resp_timer);
559 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
560
561 start_ba_exit:
562 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
563 sta_info_put(sta);
564 return ret;
565 }
566 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
567
568 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
569 u8 *ra, u16 tid,
570 enum ieee80211_back_parties initiator)
571 {
572 struct ieee80211_local *local = hw_to_local(hw);
573 struct sta_info *sta;
574 u8 *state;
575 int ret = 0;
576 DECLARE_MAC_BUF(mac);
577
578 if (tid >= STA_TID_NUM)
579 return -EINVAL;
580
581 #ifdef CONFIG_MAC80211_HT_DEBUG
582 printk(KERN_DEBUG "Stop a BA session requested for %s tid %u\n",
583 print_mac(mac, ra), tid);
584 #endif /* CONFIG_MAC80211_HT_DEBUG */
585
586 sta = sta_info_get(local, ra);
587 if (!sta)
588 return -ENOENT;
589
590 /* check if the TID is in aggregation */
591 state = &sta->ampdu_mlme.tid_tx[tid].state;
592 spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
593
594 if (*state != HT_AGG_STATE_OPERATIONAL) {
595 #ifdef CONFIG_MAC80211_HT_DEBUG
596 printk(KERN_DEBUG "Try to stop Tx aggregation on"
597 " non active TID\n");
598 #endif /* CONFIG_MAC80211_HT_DEBUG */
599 ret = -ENOENT;
600 goto stop_BA_exit;
601 }
602
603 ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
604
605 *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
606 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
607
608 if (local->ops->ampdu_action)
609 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
610 ra, tid, NULL);
611
612 /* case HW denied going back to legacy */
613 if (ret) {
614 WARN_ON(ret != -EBUSY);
615 *state = HT_AGG_STATE_OPERATIONAL;
616 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
617 goto stop_BA_exit;
618 }
619
620 stop_BA_exit:
621 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
622 sta_info_put(sta);
623 return ret;
624 }
625 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
626
627 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
628 {
629 struct ieee80211_local *local = hw_to_local(hw);
630 struct sta_info *sta;
631 u8 *state;
632 DECLARE_MAC_BUF(mac);
633
634 if (tid >= STA_TID_NUM) {
635 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
636 tid, STA_TID_NUM);
637 return;
638 }
639
640 sta = sta_info_get(local, ra);
641 if (!sta) {
642 printk(KERN_DEBUG "Could not find station: %s\n",
643 print_mac(mac, ra));
644 return;
645 }
646
647 state = &sta->ampdu_mlme.tid_tx[tid].state;
648 spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
649
650 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
651 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
652 *state);
653 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
654 sta_info_put(sta);
655 return;
656 }
657
658 WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
659
660 *state |= HT_ADDBA_DRV_READY_MSK;
661
662 if (*state == HT_AGG_STATE_OPERATIONAL) {
663 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
664 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
665 }
666 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
667 sta_info_put(sta);
668 }
669 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
670
671 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
672 {
673 struct ieee80211_local *local = hw_to_local(hw);
674 struct sta_info *sta;
675 u8 *state;
676 int agg_queue;
677 DECLARE_MAC_BUF(mac);
678
679 if (tid >= STA_TID_NUM) {
680 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
681 tid, STA_TID_NUM);
682 return;
683 }
684
685 printk(KERN_DEBUG "Stop a BA session requested on DA %s tid %d\n",
686 print_mac(mac, ra), tid);
687
688 sta = sta_info_get(local, ra);
689 if (!sta) {
690 printk(KERN_DEBUG "Could not find station: %s\n",
691 print_mac(mac, ra));
692 return;
693 }
694 state = &sta->ampdu_mlme.tid_tx[tid].state;
695
696 spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
697 if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
698 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
699 sta_info_put(sta);
700 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
701 return;
702 }
703
704 if (*state & HT_AGG_STATE_INITIATOR_MSK)
705 ieee80211_send_delba(sta->dev, ra, tid,
706 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
707
708 agg_queue = sta->tid_to_tx_q[tid];
709
710 /* avoid ordering issues: we are the only one that can modify
711 * the content of the qdiscs */
712 spin_lock_bh(&local->mdev->queue_lock);
713 /* remove the queue for this aggregation */
714 ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
715 spin_unlock_bh(&local->mdev->queue_lock);
716
717 /* we just requeued the all the frames that were in the removed
718 * queue, and since we might miss a softirq we do netif_schedule.
719 * ieee80211_wake_queue is not used here as this queue is not
720 * necessarily stopped */
721 netif_schedule(local->mdev);
722 *state = HT_AGG_STATE_IDLE;
723 sta->ampdu_mlme.tid_tx[tid].addba_req_num = 0;
724 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
725
726 sta_info_put(sta);
727 }
728 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
729
730 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
731 const u8 *ra, u16 tid)
732 {
733 struct ieee80211_local *local = hw_to_local(hw);
734 struct ieee80211_ra_tid *ra_tid;
735 struct sk_buff *skb = dev_alloc_skb(0);
736
737 if (unlikely(!skb)) {
738 if (net_ratelimit())
739 printk(KERN_WARNING "%s: Not enough memory, "
740 "dropping start BA session", skb->dev->name);
741 return;
742 }
743 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
744 memcpy(&ra_tid->ra, ra, ETH_ALEN);
745 ra_tid->tid = tid;
746
747 skb->pkt_type = IEEE80211_ADDBA_MSG;
748 skb_queue_tail(&local->skb_queue, skb);
749 tasklet_schedule(&local->tasklet);
750 }
751 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
752
753 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
754 const u8 *ra, u16 tid)
755 {
756 struct ieee80211_local *local = hw_to_local(hw);
757 struct ieee80211_ra_tid *ra_tid;
758 struct sk_buff *skb = dev_alloc_skb(0);
759
760 if (unlikely(!skb)) {
761 if (net_ratelimit())
762 printk(KERN_WARNING "%s: Not enough memory, "
763 "dropping stop BA session", skb->dev->name);
764 return;
765 }
766 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
767 memcpy(&ra_tid->ra, ra, ETH_ALEN);
768 ra_tid->tid = tid;
769
770 skb->pkt_type = IEEE80211_DELBA_MSG;
771 skb_queue_tail(&local->skb_queue, skb);
772 tasklet_schedule(&local->tasklet);
773 }
774 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
775
776 static void ieee80211_set_multicast_list(struct net_device *dev)
777 {
778 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
779 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
780 int allmulti, promisc, sdata_allmulti, sdata_promisc;
781
782 allmulti = !!(dev->flags & IFF_ALLMULTI);
783 promisc = !!(dev->flags & IFF_PROMISC);
784 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
785 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
786
787 if (allmulti != sdata_allmulti) {
788 if (dev->flags & IFF_ALLMULTI)
789 atomic_inc(&local->iff_allmultis);
790 else
791 atomic_dec(&local->iff_allmultis);
792 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
793 }
794
795 if (promisc != sdata_promisc) {
796 if (dev->flags & IFF_PROMISC)
797 atomic_inc(&local->iff_promiscs);
798 else
799 atomic_dec(&local->iff_promiscs);
800 sdata->flags ^= IEEE80211_SDATA_PROMISC;
801 }
802
803 dev_mc_sync(local->mdev, dev);
804 }
805
806 static const struct header_ops ieee80211_header_ops = {
807 .create = eth_header,
808 .parse = header_parse_80211,
809 .rebuild = eth_rebuild_header,
810 .cache = eth_header_cache,
811 .cache_update = eth_header_cache_update,
812 };
813
814 /* Must not be called for mdev */
815 void ieee80211_if_setup(struct net_device *dev)
816 {
817 ether_setup(dev);
818 dev->hard_start_xmit = ieee80211_subif_start_xmit;
819 dev->wireless_handlers = &ieee80211_iw_handler_def;
820 dev->set_multicast_list = ieee80211_set_multicast_list;
821 dev->change_mtu = ieee80211_change_mtu;
822 dev->open = ieee80211_open;
823 dev->stop = ieee80211_stop;
824 dev->destructor = ieee80211_if_free;
825 }
826
827 /* WDS specialties */
828
829 int ieee80211_if_update_wds(struct net_device *dev, u8 *remote_addr)
830 {
831 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
832 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
833 struct sta_info *sta;
834 DECLARE_MAC_BUF(mac);
835
836 if (compare_ether_addr(remote_addr, sdata->u.wds.remote_addr) == 0)
837 return 0;
838
839 /* Create STA entry for the new peer */
840 sta = sta_info_add(local, dev, remote_addr, GFP_KERNEL);
841 if (IS_ERR(sta))
842 return PTR_ERR(sta);
843
844 sta->flags |= WLAN_STA_AUTHORIZED;
845
846 sta_info_put(sta);
847
848 /* Remove STA entry for the old peer */
849 sta = sta_info_get(local, sdata->u.wds.remote_addr);
850 if (sta) {
851 sta_info_free(sta);
852 sta_info_put(sta);
853 } else {
854 printk(KERN_DEBUG "%s: could not find STA entry for WDS link "
855 "peer %s\n",
856 dev->name, print_mac(mac, sdata->u.wds.remote_addr));
857 }
858
859 /* Update WDS link data */
860 memcpy(&sdata->u.wds.remote_addr, remote_addr, ETH_ALEN);
861
862 return 0;
863 }
864
865 /* everything else */
866
867 static int __ieee80211_if_config(struct net_device *dev,
868 struct sk_buff *beacon,
869 struct ieee80211_tx_control *control)
870 {
871 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
872 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
873 struct ieee80211_if_conf conf;
874
875 if (!local->ops->config_interface || !netif_running(dev))
876 return 0;
877
878 memset(&conf, 0, sizeof(conf));
879 conf.type = sdata->vif.type;
880 if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
881 sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
882 conf.bssid = sdata->u.sta.bssid;
883 conf.ssid = sdata->u.sta.ssid;
884 conf.ssid_len = sdata->u.sta.ssid_len;
885 } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
886 conf.ssid = sdata->u.ap.ssid;
887 conf.ssid_len = sdata->u.ap.ssid_len;
888 conf.beacon = beacon;
889 conf.beacon_control = control;
890 }
891 return local->ops->config_interface(local_to_hw(local),
892 &sdata->vif, &conf);
893 }
894
895 int ieee80211_if_config(struct net_device *dev)
896 {
897 return __ieee80211_if_config(dev, NULL, NULL);
898 }
899
900 int ieee80211_if_config_beacon(struct net_device *dev)
901 {
902 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
903 struct ieee80211_tx_control control;
904 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
905 struct sk_buff *skb;
906
907 if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
908 return 0;
909 skb = ieee80211_beacon_get(local_to_hw(local), &sdata->vif,
910 &control);
911 if (!skb)
912 return -ENOMEM;
913 return __ieee80211_if_config(dev, skb, &control);
914 }
915
916 int ieee80211_hw_config(struct ieee80211_local *local)
917 {
918 struct ieee80211_channel *chan;
919 int ret = 0;
920
921 if (local->sta_sw_scanning)
922 chan = local->scan_channel;
923 else
924 chan = local->oper_channel;
925
926 local->hw.conf.channel = chan;
927
928 if (!local->hw.conf.power_level)
929 local->hw.conf.power_level = chan->max_power;
930 else
931 local->hw.conf.power_level = min(chan->max_power,
932 local->hw.conf.power_level);
933
934 local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
935
936 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
937 printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
938 wiphy_name(local->hw.wiphy), chan->center_freq);
939 #endif
940
941 if (local->open_count)
942 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
943
944 return ret;
945 }
946
947 /**
948 * ieee80211_hw_config_ht should be used only after legacy configuration
949 * has been determined, as ht configuration depends upon the hardware's
950 * HT abilities for a _specific_ band.
951 */
952 int ieee80211_hw_config_ht(struct ieee80211_local *local, int enable_ht,
953 struct ieee80211_ht_info *req_ht_cap,
954 struct ieee80211_ht_bss_info *req_bss_cap)
955 {
956 struct ieee80211_conf *conf = &local->hw.conf;
957 struct ieee80211_supported_band *sband;
958 int i;
959
960 sband = local->hw.wiphy->bands[conf->channel->band];
961
962 /* HT is not supported */
963 if (!sband->ht_info.ht_supported) {
964 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
965 return -EOPNOTSUPP;
966 }
967
968 /* disable HT */
969 if (!enable_ht) {
970 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
971 } else {
972 conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
973 conf->ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
974 conf->ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS);
975 conf->ht_conf.cap |=
976 sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS;
977 conf->ht_bss_conf.primary_channel =
978 req_bss_cap->primary_channel;
979 conf->ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
980 conf->ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
981 for (i = 0; i < SUPP_MCS_SET_LEN; i++)
982 conf->ht_conf.supp_mcs_set[i] =
983 sband->ht_info.supp_mcs_set[i] &
984 req_ht_cap->supp_mcs_set[i];
985
986 /* In STA mode, this gives us indication
987 * to the AP's mode of operation */
988 conf->ht_conf.ht_supported = 1;
989 conf->ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
990 conf->ht_conf.ampdu_density = req_ht_cap->ampdu_density;
991 }
992
993 local->ops->conf_ht(local_to_hw(local), &local->hw.conf);
994
995 return 0;
996 }
997
998 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
999 u32 changed)
1000 {
1001 struct ieee80211_local *local = sdata->local;
1002
1003 if (!changed)
1004 return;
1005
1006 if (local->ops->bss_info_changed)
1007 local->ops->bss_info_changed(local_to_hw(local),
1008 &sdata->vif,
1009 &sdata->bss_conf,
1010 changed);
1011 }
1012
1013 void ieee80211_reset_erp_info(struct net_device *dev)
1014 {
1015 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1016
1017 sdata->bss_conf.use_cts_prot = 0;
1018 sdata->bss_conf.use_short_preamble = 0;
1019 ieee80211_bss_info_change_notify(sdata,
1020 BSS_CHANGED_ERP_CTS_PROT |
1021 BSS_CHANGED_ERP_PREAMBLE);
1022 }
1023
1024 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1025 struct sk_buff *skb,
1026 struct ieee80211_tx_status *status)
1027 {
1028 struct ieee80211_local *local = hw_to_local(hw);
1029 struct ieee80211_tx_status *saved;
1030 int tmp;
1031
1032 skb->dev = local->mdev;
1033 saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
1034 if (unlikely(!saved)) {
1035 if (net_ratelimit())
1036 printk(KERN_WARNING "%s: Not enough memory, "
1037 "dropping tx status", skb->dev->name);
1038 /* should be dev_kfree_skb_irq, but due to this function being
1039 * named _irqsafe instead of just _irq we can't be sure that
1040 * people won't call it from non-irq contexts */
1041 dev_kfree_skb_any(skb);
1042 return;
1043 }
1044 memcpy(saved, status, sizeof(struct ieee80211_tx_status));
1045 /* copy pointer to saved status into skb->cb for use by tasklet */
1046 memcpy(skb->cb, &saved, sizeof(saved));
1047
1048 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
1049 skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
1050 &local->skb_queue : &local->skb_queue_unreliable, skb);
1051 tmp = skb_queue_len(&local->skb_queue) +
1052 skb_queue_len(&local->skb_queue_unreliable);
1053 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
1054 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1055 memcpy(&saved, skb->cb, sizeof(saved));
1056 kfree(saved);
1057 dev_kfree_skb_irq(skb);
1058 tmp--;
1059 I802_DEBUG_INC(local->tx_status_drop);
1060 }
1061 tasklet_schedule(&local->tasklet);
1062 }
1063 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
1064
1065 static void ieee80211_tasklet_handler(unsigned long data)
1066 {
1067 struct ieee80211_local *local = (struct ieee80211_local *) data;
1068 struct sk_buff *skb;
1069 struct ieee80211_rx_status rx_status;
1070 struct ieee80211_tx_status *tx_status;
1071 struct ieee80211_ra_tid *ra_tid;
1072
1073 while ((skb = skb_dequeue(&local->skb_queue)) ||
1074 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1075 switch (skb->pkt_type) {
1076 case IEEE80211_RX_MSG:
1077 /* status is in skb->cb */
1078 memcpy(&rx_status, skb->cb, sizeof(rx_status));
1079 /* Clear skb->pkt_type in order to not confuse kernel
1080 * netstack. */
1081 skb->pkt_type = 0;
1082 __ieee80211_rx(local_to_hw(local), skb, &rx_status);
1083 break;
1084 case IEEE80211_TX_STATUS_MSG:
1085 /* get pointer to saved status out of skb->cb */
1086 memcpy(&tx_status, skb->cb, sizeof(tx_status));
1087 skb->pkt_type = 0;
1088 ieee80211_tx_status(local_to_hw(local),
1089 skb, tx_status);
1090 kfree(tx_status);
1091 break;
1092 case IEEE80211_DELBA_MSG:
1093 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1094 ieee80211_stop_tx_ba_cb(local_to_hw(local),
1095 ra_tid->ra, ra_tid->tid);
1096 dev_kfree_skb(skb);
1097 break;
1098 case IEEE80211_ADDBA_MSG:
1099 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1100 ieee80211_start_tx_ba_cb(local_to_hw(local),
1101 ra_tid->ra, ra_tid->tid);
1102 dev_kfree_skb(skb);
1103 break ;
1104 default: /* should never get here! */
1105 printk(KERN_ERR "%s: Unknown message type (%d)\n",
1106 wiphy_name(local->hw.wiphy), skb->pkt_type);
1107 dev_kfree_skb(skb);
1108 break;
1109 }
1110 }
1111 }
1112
1113 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
1114 * make a prepared TX frame (one that has been given to hw) to look like brand
1115 * new IEEE 802.11 frame that is ready to go through TX processing again.
1116 * Also, tx_packet_data in cb is restored from tx_control. */
1117 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
1118 struct ieee80211_key *key,
1119 struct sk_buff *skb,
1120 struct ieee80211_tx_control *control)
1121 {
1122 int hdrlen, iv_len, mic_len;
1123 struct ieee80211_tx_packet_data *pkt_data;
1124
1125 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1126 pkt_data->ifindex = vif_to_sdata(control->vif)->dev->ifindex;
1127 pkt_data->flags = 0;
1128 if (control->flags & IEEE80211_TXCTL_REQ_TX_STATUS)
1129 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
1130 if (control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)
1131 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1132 if (control->flags & IEEE80211_TXCTL_REQUEUE)
1133 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
1134 if (control->flags & IEEE80211_TXCTL_EAPOL_FRAME)
1135 pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME;
1136 pkt_data->queue = control->queue;
1137
1138 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1139
1140 if (!key)
1141 goto no_key;
1142
1143 switch (key->conf.alg) {
1144 case ALG_WEP:
1145 iv_len = WEP_IV_LEN;
1146 mic_len = WEP_ICV_LEN;
1147 break;
1148 case ALG_TKIP:
1149 iv_len = TKIP_IV_LEN;
1150 mic_len = TKIP_ICV_LEN;
1151 break;
1152 case ALG_CCMP:
1153 iv_len = CCMP_HDR_LEN;
1154 mic_len = CCMP_MIC_LEN;
1155 break;
1156 default:
1157 goto no_key;
1158 }
1159
1160 if (skb->len >= mic_len &&
1161 !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1162 skb_trim(skb, skb->len - mic_len);
1163 if (skb->len >= iv_len && skb->len > hdrlen) {
1164 memmove(skb->data + iv_len, skb->data, hdrlen);
1165 skb_pull(skb, iv_len);
1166 }
1167
1168 no_key:
1169 {
1170 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1171 u16 fc = le16_to_cpu(hdr->frame_control);
1172 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
1173 fc &= ~IEEE80211_STYPE_QOS_DATA;
1174 hdr->frame_control = cpu_to_le16(fc);
1175 memmove(skb->data + 2, skb->data, hdrlen - 2);
1176 skb_pull(skb, 2);
1177 }
1178 }
1179 }
1180
1181 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
1182 struct sta_info *sta,
1183 struct sk_buff *skb,
1184 struct ieee80211_tx_status *status)
1185 {
1186 sta->tx_filtered_count++;
1187
1188 /*
1189 * Clear the TX filter mask for this STA when sending the next
1190 * packet. If the STA went to power save mode, this will happen
1191 * happen when it wakes up for the next time.
1192 */
1193 sta->flags |= WLAN_STA_CLEAR_PS_FILT;
1194
1195 /*
1196 * This code races in the following way:
1197 *
1198 * (1) STA sends frame indicating it will go to sleep and does so
1199 * (2) hardware/firmware adds STA to filter list, passes frame up
1200 * (3) hardware/firmware processes TX fifo and suppresses a frame
1201 * (4) we get TX status before having processed the frame and
1202 * knowing that the STA has gone to sleep.
1203 *
1204 * This is actually quite unlikely even when both those events are
1205 * processed from interrupts coming in quickly after one another or
1206 * even at the same time because we queue both TX status events and
1207 * RX frames to be processed by a tasklet and process them in the
1208 * same order that they were received or TX status last. Hence, there
1209 * is no race as long as the frame RX is processed before the next TX
1210 * status, which drivers can ensure, see below.
1211 *
1212 * Note that this can only happen if the hardware or firmware can
1213 * actually add STAs to the filter list, if this is done by the
1214 * driver in response to set_tim() (which will only reduce the race
1215 * this whole filtering tries to solve, not completely solve it)
1216 * this situation cannot happen.
1217 *
1218 * To completely solve this race drivers need to make sure that they
1219 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1220 * functions and
1221 * (b) always process RX events before TX status events if ordering
1222 * can be unknown, for example with different interrupt status
1223 * bits.
1224 */
1225 if (sta->flags & WLAN_STA_PS &&
1226 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1227 ieee80211_remove_tx_extra(local, sta->key, skb,
1228 &status->control);
1229 skb_queue_tail(&sta->tx_filtered, skb);
1230 return;
1231 }
1232
1233 if (!(sta->flags & WLAN_STA_PS) &&
1234 !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
1235 /* Software retry the packet once */
1236 status->control.flags |= IEEE80211_TXCTL_REQUEUE;
1237 ieee80211_remove_tx_extra(local, sta->key, skb,
1238 &status->control);
1239 dev_queue_xmit(skb);
1240 return;
1241 }
1242
1243 if (net_ratelimit())
1244 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1245 "queue_len=%d PS=%d @%lu\n",
1246 wiphy_name(local->hw.wiphy),
1247 skb_queue_len(&sta->tx_filtered),
1248 !!(sta->flags & WLAN_STA_PS), jiffies);
1249 dev_kfree_skb(skb);
1250 }
1251
1252 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
1253 struct ieee80211_tx_status *status)
1254 {
1255 struct sk_buff *skb2;
1256 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1257 struct ieee80211_local *local = hw_to_local(hw);
1258 u16 frag, type;
1259 struct ieee80211_tx_status_rtap_hdr *rthdr;
1260 struct ieee80211_sub_if_data *sdata;
1261 struct net_device *prev_dev = NULL;
1262
1263 if (!status) {
1264 printk(KERN_ERR
1265 "%s: ieee80211_tx_status called with NULL status\n",
1266 wiphy_name(local->hw.wiphy));
1267 dev_kfree_skb(skb);
1268 return;
1269 }
1270
1271 if (status->excessive_retries) {
1272 struct sta_info *sta;
1273 sta = sta_info_get(local, hdr->addr1);
1274 if (sta) {
1275 if (sta->flags & WLAN_STA_PS) {
1276 /*
1277 * The STA is in power save mode, so assume
1278 * that this TX packet failed because of that.
1279 */
1280 status->excessive_retries = 0;
1281 status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
1282 ieee80211_handle_filtered_frame(local, sta,
1283 skb, status);
1284 sta_info_put(sta);
1285 return;
1286 }
1287 sta_info_put(sta);
1288 }
1289 }
1290
1291 if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
1292 struct sta_info *sta;
1293 sta = sta_info_get(local, hdr->addr1);
1294 if (sta) {
1295 ieee80211_handle_filtered_frame(local, sta, skb,
1296 status);
1297 sta_info_put(sta);
1298 return;
1299 }
1300 } else
1301 rate_control_tx_status(local->mdev, skb, status);
1302
1303 ieee80211_led_tx(local, 0);
1304
1305 /* SNMP counters
1306 * Fragments are passed to low-level drivers as separate skbs, so these
1307 * are actually fragments, not frames. Update frame counters only for
1308 * the first fragment of the frame. */
1309
1310 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1311 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1312
1313 if (status->flags & IEEE80211_TX_STATUS_ACK) {
1314 if (frag == 0) {
1315 local->dot11TransmittedFrameCount++;
1316 if (is_multicast_ether_addr(hdr->addr1))
1317 local->dot11MulticastTransmittedFrameCount++;
1318 if (status->retry_count > 0)
1319 local->dot11RetryCount++;
1320 if (status->retry_count > 1)
1321 local->dot11MultipleRetryCount++;
1322 }
1323
1324 /* This counter shall be incremented for an acknowledged MPDU
1325 * with an individual address in the address 1 field or an MPDU
1326 * with a multicast address in the address 1 field of type Data
1327 * or Management. */
1328 if (!is_multicast_ether_addr(hdr->addr1) ||
1329 type == IEEE80211_FTYPE_DATA ||
1330 type == IEEE80211_FTYPE_MGMT)
1331 local->dot11TransmittedFragmentCount++;
1332 } else {
1333 if (frag == 0)
1334 local->dot11FailedCount++;
1335 }
1336
1337 /* this was a transmitted frame, but now we want to reuse it */
1338 skb_orphan(skb);
1339
1340 /*
1341 * This is a bit racy but we can avoid a lot of work
1342 * with this test...
1343 */
1344 if (!local->monitors && !local->cooked_mntrs) {
1345 dev_kfree_skb(skb);
1346 return;
1347 }
1348
1349 /* send frame to monitor interfaces now */
1350
1351 if (skb_headroom(skb) < sizeof(*rthdr)) {
1352 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1353 dev_kfree_skb(skb);
1354 return;
1355 }
1356
1357 rthdr = (struct ieee80211_tx_status_rtap_hdr*)
1358 skb_push(skb, sizeof(*rthdr));
1359
1360 memset(rthdr, 0, sizeof(*rthdr));
1361 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1362 rthdr->hdr.it_present =
1363 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1364 (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1365
1366 if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
1367 !is_multicast_ether_addr(hdr->addr1))
1368 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1369
1370 if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
1371 (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
1372 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1373 else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
1374 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1375
1376 rthdr->data_retries = status->retry_count;
1377
1378 /* XXX: is this sufficient for BPF? */
1379 skb_set_mac_header(skb, 0);
1380 skb->ip_summed = CHECKSUM_UNNECESSARY;
1381 skb->pkt_type = PACKET_OTHERHOST;
1382 skb->protocol = htons(ETH_P_802_2);
1383 memset(skb->cb, 0, sizeof(skb->cb));
1384
1385 rcu_read_lock();
1386 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1387 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1388 if (!netif_running(sdata->dev))
1389 continue;
1390
1391 if (prev_dev) {
1392 skb2 = skb_clone(skb, GFP_ATOMIC);
1393 if (skb2) {
1394 skb2->dev = prev_dev;
1395 netif_rx(skb2);
1396 }
1397 }
1398
1399 prev_dev = sdata->dev;
1400 }
1401 }
1402 if (prev_dev) {
1403 skb->dev = prev_dev;
1404 netif_rx(skb);
1405 skb = NULL;
1406 }
1407 rcu_read_unlock();
1408 dev_kfree_skb(skb);
1409 }
1410 EXPORT_SYMBOL(ieee80211_tx_status);
1411
1412 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1413 const struct ieee80211_ops *ops)
1414 {
1415 struct ieee80211_local *local;
1416 int priv_size;
1417 struct wiphy *wiphy;
1418
1419 /* Ensure 32-byte alignment of our private data and hw private data.
1420 * We use the wiphy priv data for both our ieee80211_local and for
1421 * the driver's private data
1422 *
1423 * In memory it'll be like this:
1424 *
1425 * +-------------------------+
1426 * | struct wiphy |
1427 * +-------------------------+
1428 * | struct ieee80211_local |
1429 * +-------------------------+
1430 * | driver's private data |
1431 * +-------------------------+
1432 *
1433 */
1434 priv_size = ((sizeof(struct ieee80211_local) +
1435 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1436 priv_data_len;
1437
1438 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1439
1440 if (!wiphy)
1441 return NULL;
1442
1443 wiphy->privid = mac80211_wiphy_privid;
1444
1445 local = wiphy_priv(wiphy);
1446 local->hw.wiphy = wiphy;
1447
1448 local->hw.priv = (char *)local +
1449 ((sizeof(struct ieee80211_local) +
1450 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1451
1452 BUG_ON(!ops->tx);
1453 BUG_ON(!ops->start);
1454 BUG_ON(!ops->stop);
1455 BUG_ON(!ops->config);
1456 BUG_ON(!ops->add_interface);
1457 BUG_ON(!ops->remove_interface);
1458 BUG_ON(!ops->configure_filter);
1459 local->ops = ops;
1460
1461 local->hw.queues = 1; /* default */
1462
1463 local->bridge_packets = 1;
1464
1465 local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1466 local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1467 local->short_retry_limit = 7;
1468 local->long_retry_limit = 4;
1469 local->hw.conf.radio_enabled = 1;
1470
1471 INIT_LIST_HEAD(&local->interfaces);
1472
1473 INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1474
1475 sta_info_init(local);
1476
1477 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1478 (unsigned long)local);
1479 tasklet_disable(&local->tx_pending_tasklet);
1480
1481 tasklet_init(&local->tasklet,
1482 ieee80211_tasklet_handler,
1483 (unsigned long) local);
1484 tasklet_disable(&local->tasklet);
1485
1486 skb_queue_head_init(&local->skb_queue);
1487 skb_queue_head_init(&local->skb_queue_unreliable);
1488
1489 return local_to_hw(local);
1490 }
1491 EXPORT_SYMBOL(ieee80211_alloc_hw);
1492
1493 int ieee80211_register_hw(struct ieee80211_hw *hw)
1494 {
1495 struct ieee80211_local *local = hw_to_local(hw);
1496 const char *name;
1497 int result;
1498 enum ieee80211_band band;
1499 struct net_device *mdev;
1500 struct ieee80211_sub_if_data *sdata;
1501
1502 /*
1503 * generic code guarantees at least one band,
1504 * set this very early because much code assumes
1505 * that hw.conf.channel is assigned
1506 */
1507 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1508 struct ieee80211_supported_band *sband;
1509
1510 sband = local->hw.wiphy->bands[band];
1511 if (sband) {
1512 /* init channel we're on */
1513 local->hw.conf.channel =
1514 local->oper_channel =
1515 local->scan_channel = &sband->channels[0];
1516 break;
1517 }
1518 }
1519
1520 result = wiphy_register(local->hw.wiphy);
1521 if (result < 0)
1522 return result;
1523
1524 /* for now, mdev needs sub_if_data :/ */
1525 mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
1526 "wmaster%d", ether_setup);
1527 if (!mdev)
1528 goto fail_mdev_alloc;
1529
1530 sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
1531 mdev->ieee80211_ptr = &sdata->wdev;
1532 sdata->wdev.wiphy = local->hw.wiphy;
1533
1534 local->mdev = mdev;
1535
1536 ieee80211_rx_bss_list_init(mdev);
1537
1538 mdev->hard_start_xmit = ieee80211_master_start_xmit;
1539 mdev->open = ieee80211_master_open;
1540 mdev->stop = ieee80211_master_stop;
1541 mdev->type = ARPHRD_IEEE80211;
1542 mdev->header_ops = &ieee80211_header_ops;
1543 mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1544
1545 sdata->vif.type = IEEE80211_IF_TYPE_AP;
1546 sdata->dev = mdev;
1547 sdata->local = local;
1548 sdata->u.ap.force_unicast_rateidx = -1;
1549 sdata->u.ap.max_ratectrl_rateidx = -1;
1550 ieee80211_if_sdata_init(sdata);
1551
1552 /* no RCU needed since we're still during init phase */
1553 list_add_tail(&sdata->list, &local->interfaces);
1554
1555 name = wiphy_dev(local->hw.wiphy)->driver->name;
1556 local->hw.workqueue = create_singlethread_workqueue(name);
1557 if (!local->hw.workqueue) {
1558 result = -ENOMEM;
1559 goto fail_workqueue;
1560 }
1561
1562 /*
1563 * The hardware needs headroom for sending the frame,
1564 * and we need some headroom for passing the frame to monitor
1565 * interfaces, but never both at the same time.
1566 */
1567 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1568 sizeof(struct ieee80211_tx_status_rtap_hdr));
1569
1570 debugfs_hw_add(local);
1571
1572 local->hw.conf.beacon_int = 1000;
1573
1574 local->wstats_flags |= local->hw.max_rssi ?
1575 IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID;
1576 local->wstats_flags |= local->hw.max_signal ?
1577 IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1578 local->wstats_flags |= local->hw.max_noise ?
1579 IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1580 if (local->hw.max_rssi < 0 || local->hw.max_noise < 0)
1581 local->wstats_flags |= IW_QUAL_DBM;
1582
1583 result = sta_info_start(local);
1584 if (result < 0)
1585 goto fail_sta_info;
1586
1587 rtnl_lock();
1588 result = dev_alloc_name(local->mdev, local->mdev->name);
1589 if (result < 0)
1590 goto fail_dev;
1591
1592 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1593 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1594
1595 result = register_netdevice(local->mdev);
1596 if (result < 0)
1597 goto fail_dev;
1598
1599 ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1600 ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
1601
1602 result = ieee80211_init_rate_ctrl_alg(local,
1603 hw->rate_control_algorithm);
1604 if (result < 0) {
1605 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1606 "algorithm\n", wiphy_name(local->hw.wiphy));
1607 goto fail_rate;
1608 }
1609
1610 result = ieee80211_wep_init(local);
1611
1612 if (result < 0) {
1613 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1614 wiphy_name(local->hw.wiphy));
1615 goto fail_wep;
1616 }
1617
1618 ieee80211_install_qdisc(local->mdev);
1619
1620 /* add one default STA interface */
1621 result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1622 IEEE80211_IF_TYPE_STA);
1623 if (result)
1624 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1625 wiphy_name(local->hw.wiphy));
1626
1627 local->reg_state = IEEE80211_DEV_REGISTERED;
1628 rtnl_unlock();
1629
1630 ieee80211_led_init(local);
1631
1632 return 0;
1633
1634 fail_wep:
1635 rate_control_deinitialize(local);
1636 fail_rate:
1637 ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1638 unregister_netdevice(local->mdev);
1639 fail_dev:
1640 rtnl_unlock();
1641 sta_info_stop(local);
1642 fail_sta_info:
1643 debugfs_hw_del(local);
1644 destroy_workqueue(local->hw.workqueue);
1645 fail_workqueue:
1646 ieee80211_if_free(local->mdev);
1647 local->mdev = NULL;
1648 fail_mdev_alloc:
1649 wiphy_unregister(local->hw.wiphy);
1650 return result;
1651 }
1652 EXPORT_SYMBOL(ieee80211_register_hw);
1653
1654 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1655 {
1656 struct ieee80211_local *local = hw_to_local(hw);
1657 struct ieee80211_sub_if_data *sdata, *tmp;
1658
1659 tasklet_kill(&local->tx_pending_tasklet);
1660 tasklet_kill(&local->tasklet);
1661
1662 rtnl_lock();
1663
1664 BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1665
1666 local->reg_state = IEEE80211_DEV_UNREGISTERED;
1667
1668 /*
1669 * At this point, interface list manipulations are fine
1670 * because the driver cannot be handing us frames any
1671 * more and the tasklet is killed.
1672 */
1673
1674 /*
1675 * First, we remove all non-master interfaces. Do this because they
1676 * may have bss pointer dependency on the master, and when we free
1677 * the master these would be freed as well, breaking our list
1678 * iteration completely.
1679 */
1680 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1681 if (sdata->dev == local->mdev)
1682 continue;
1683 list_del(&sdata->list);
1684 __ieee80211_if_del(local, sdata);
1685 }
1686
1687 /* then, finally, remove the master interface */
1688 __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));
1689
1690 rtnl_unlock();
1691
1692 ieee80211_rx_bss_list_deinit(local->mdev);
1693 ieee80211_clear_tx_pending(local);
1694 sta_info_stop(local);
1695 rate_control_deinitialize(local);
1696 debugfs_hw_del(local);
1697
1698 if (skb_queue_len(&local->skb_queue)
1699 || skb_queue_len(&local->skb_queue_unreliable))
1700 printk(KERN_WARNING "%s: skb_queue not empty\n",
1701 wiphy_name(local->hw.wiphy));
1702 skb_queue_purge(&local->skb_queue);
1703 skb_queue_purge(&local->skb_queue_unreliable);
1704
1705 destroy_workqueue(local->hw.workqueue);
1706 wiphy_unregister(local->hw.wiphy);
1707 ieee80211_wep_free(local);
1708 ieee80211_led_exit(local);
1709 ieee80211_if_free(local->mdev);
1710 local->mdev = NULL;
1711 }
1712 EXPORT_SYMBOL(ieee80211_unregister_hw);
1713
1714 void ieee80211_free_hw(struct ieee80211_hw *hw)
1715 {
1716 struct ieee80211_local *local = hw_to_local(hw);
1717
1718 wiphy_free(local->hw.wiphy);
1719 }
1720 EXPORT_SYMBOL(ieee80211_free_hw);
1721
1722 static int __init ieee80211_init(void)
1723 {
1724 struct sk_buff *skb;
1725 int ret;
1726
1727 BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
1728
1729 ret = rc80211_simple_init();
1730 if (ret)
1731 goto out;
1732
1733 ret = rc80211_pid_init();
1734 if (ret)
1735 goto out_cleanup_simple;
1736
1737 ret = ieee80211_wme_register();
1738 if (ret) {
1739 printk(KERN_DEBUG "ieee80211_init: failed to "
1740 "initialize WME (err=%d)\n", ret);
1741 goto out_cleanup_pid;
1742 }
1743
1744 ieee80211_debugfs_netdev_init();
1745
1746 return 0;
1747
1748 out_cleanup_pid:
1749 rc80211_pid_exit();
1750 out_cleanup_simple:
1751 rc80211_simple_exit();
1752 out:
1753 return ret;
1754 }
1755
1756 static void __exit ieee80211_exit(void)
1757 {
1758 rc80211_simple_exit();
1759 rc80211_pid_exit();
1760
1761 ieee80211_wme_unregister();
1762 ieee80211_debugfs_netdev_exit();
1763 }
1764
1765
1766 subsys_initcall(ieee80211_init);
1767 module_exit(ieee80211_exit);
1768
1769 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1770 MODULE_LICENSE("GPL");
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