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Linux 2.6.31.6
[linux/fpc-iii.git] / net / mac80211 / main.c
blob092a017b237e35faa10ef4c72a5f0e21b64c33b6
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #include <net/mac80211.h>
12 #include <net/ieee80211_radiotap.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/netdevice.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/if_arp.h>
21 #include <linux/wireless.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/bitmap.h>
24 #include <linux/pm_qos_params.h>
25 #include <net/net_namespace.h>
26 #include <net/cfg80211.h>
27
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
30 #include "rate.h"
31 #include "mesh.h"
32 #include "wep.h"
33 #include "wme.h"
34 #include "aes_ccm.h"
35 #include "led.h"
36 #include "cfg.h"
37 #include "debugfs.h"
38 #include "debugfs_netdev.h"
39
40 /*
41 * For seeing transmitted packets on monitor interfaces
42 * we have a radiotap header too.
43 */
44 struct ieee80211_tx_status_rtap_hdr {
45 struct ieee80211_radiotap_header hdr;
46 u8 rate;
47 u8 padding_for_rate;
48 __le16 tx_flags;
49 u8 data_retries;
50 } __attribute__ ((packed));
51
52
53 /* must be called under mdev tx lock */
54 void ieee80211_configure_filter(struct ieee80211_local *local)
55 {
56 unsigned int changed_flags;
57 unsigned int new_flags = 0;
58
59 if (atomic_read(&local->iff_promiscs))
60 new_flags |= FIF_PROMISC_IN_BSS;
61
62 if (atomic_read(&local->iff_allmultis))
63 new_flags |= FIF_ALLMULTI;
64
65 if (local->monitors)
66 new_flags |= FIF_BCN_PRBRESP_PROMISC;
67
68 if (local->fif_fcsfail)
69 new_flags |= FIF_FCSFAIL;
70
71 if (local->fif_plcpfail)
72 new_flags |= FIF_PLCPFAIL;
73
74 if (local->fif_control)
75 new_flags |= FIF_CONTROL;
76
77 if (local->fif_other_bss)
78 new_flags |= FIF_OTHER_BSS;
79
80 changed_flags = local->filter_flags ^ new_flags;
81
82 /* be a bit nasty */
83 new_flags |= (1<<31);
84
85 drv_configure_filter(local, changed_flags, &new_flags,
86 local->mdev->mc_count,
87 local->mdev->mc_list);
88
89 WARN_ON(new_flags & (1<<31));
90
91 local->filter_flags = new_flags & ~(1<<31);
92 }
93
94 /* master interface */
95
96 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
97 {
98 memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
99 return ETH_ALEN;
100 }
101
102 static const struct header_ops ieee80211_header_ops = {
103 .create = eth_header,
104 .parse = header_parse_80211,
105 .rebuild = eth_rebuild_header,
106 .cache = eth_header_cache,
107 .cache_update = eth_header_cache_update,
108 };
109
110 static int ieee80211_master_open(struct net_device *dev)
111 {
112 struct ieee80211_master_priv *mpriv = netdev_priv(dev);
113 struct ieee80211_local *local = mpriv->local;
114 struct ieee80211_sub_if_data *sdata;
115 int res = -EOPNOTSUPP;
116
117 /* we hold the RTNL here so can safely walk the list */
118 list_for_each_entry(sdata, &local->interfaces, list) {
119 if (netif_running(sdata->dev)) {
120 res = 0;
121 break;
122 }
123 }
124
125 if (res)
126 return res;
127
128 netif_tx_start_all_queues(local->mdev);
129
130 return 0;
131 }
132
133 static int ieee80211_master_stop(struct net_device *dev)
134 {
135 struct ieee80211_master_priv *mpriv = netdev_priv(dev);
136 struct ieee80211_local *local = mpriv->local;
137 struct ieee80211_sub_if_data *sdata;
138
139 /* we hold the RTNL here so can safely walk the list */
140 list_for_each_entry(sdata, &local->interfaces, list)
141 if (netif_running(sdata->dev))
142 dev_close(sdata->dev);
143
144 return 0;
145 }
146
147 static void ieee80211_master_set_multicast_list(struct net_device *dev)
148 {
149 struct ieee80211_master_priv *mpriv = netdev_priv(dev);
150 struct ieee80211_local *local = mpriv->local;
151
152 ieee80211_configure_filter(local);
153 }
154
155 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
156 {
157 struct ieee80211_channel *chan, *scan_chan;
158 int ret = 0;
159 int power;
160 enum nl80211_channel_type channel_type;
161
162 might_sleep();
163
164 scan_chan = local->scan_channel;
165
166 if (scan_chan) {
167 chan = scan_chan;
168 channel_type = NL80211_CHAN_NO_HT;
169 } else {
170 chan = local->oper_channel;
171 channel_type = local->oper_channel_type;
172 }
173
174 if (chan != local->hw.conf.channel ||
175 channel_type != local->hw.conf.channel_type) {
176 local->hw.conf.channel = chan;
177 local->hw.conf.channel_type = channel_type;
178 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
179 }
180
181 if (scan_chan)
182 power = chan->max_power;
183 else
184 power = local->power_constr_level ?
185 (chan->max_power - local->power_constr_level) :
186 chan->max_power;
187
188 if (local->user_power_level >= 0)
189 power = min(power, local->user_power_level);
190
191 if (local->hw.conf.power_level != power) {
192 changed |= IEEE80211_CONF_CHANGE_POWER;
193 local->hw.conf.power_level = power;
194 }
195
196 if (changed && local->open_count) {
197 ret = drv_config(local, changed);
198 /*
199 * Goal:
200 * HW reconfiguration should never fail, the driver has told
201 * us what it can support so it should live up to that promise.
202 *
203 * Current status:
204 * rfkill is not integrated with mac80211 and a
205 * configuration command can thus fail if hardware rfkill
206 * is enabled
207 *
208 * FIXME: integrate rfkill with mac80211 and then add this
209 * WARN_ON() back
210 *
211 */
212 /* WARN_ON(ret); */
213 }
214
215 return ret;
216 }
217
218 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
219 u32 changed)
220 {
221 struct ieee80211_local *local = sdata->local;
222 static const u8 zero[ETH_ALEN] = { 0 };
223
224 if (!changed)
225 return;
226
227 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
228 /*
229 * While not associated, claim a BSSID of all-zeroes
230 * so that drivers don't do any weird things with the
231 * BSSID at that time.
232 */
233 if (sdata->vif.bss_conf.assoc)
234 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
235 else
236 sdata->vif.bss_conf.bssid = zero;
237 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
238 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
239 else if (sdata->vif.type == NL80211_IFTYPE_AP)
240 sdata->vif.bss_conf.bssid = sdata->dev->dev_addr;
241 else if (ieee80211_vif_is_mesh(&sdata->vif)) {
242 sdata->vif.bss_conf.bssid = zero;
243 } else {
244 WARN_ON(1);
245 return;
246 }
247
248 switch (sdata->vif.type) {
249 case NL80211_IFTYPE_AP:
250 case NL80211_IFTYPE_ADHOC:
251 case NL80211_IFTYPE_MESH_POINT:
252 break;
253 default:
254 /* do not warn to simplify caller in scan.c */
255 changed &= ~BSS_CHANGED_BEACON_ENABLED;
256 if (WARN_ON(changed & BSS_CHANGED_BEACON))
257 return;
258 break;
259 }
260
261 if (changed & BSS_CHANGED_BEACON_ENABLED) {
262 if (local->sw_scanning) {
263 sdata->vif.bss_conf.enable_beacon = false;
264 } else {
265 /*
266 * Beacon should be enabled, but AP mode must
267 * check whether there is a beacon configured.
268 */
269 switch (sdata->vif.type) {
270 case NL80211_IFTYPE_AP:
271 sdata->vif.bss_conf.enable_beacon =
272 !!rcu_dereference(sdata->u.ap.beacon);
273 break;
274 case NL80211_IFTYPE_ADHOC:
275 sdata->vif.bss_conf.enable_beacon =
276 !!rcu_dereference(sdata->u.ibss.presp);
277 break;
278 case NL80211_IFTYPE_MESH_POINT:
279 sdata->vif.bss_conf.enable_beacon = true;
280 break;
281 default:
282 /* not reached */
283 WARN_ON(1);
284 break;
285 }
286 }
287 }
288
289 drv_bss_info_changed(local, &sdata->vif,
290 &sdata->vif.bss_conf, changed);
291
292 /* DEPRECATED */
293 local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int;
294 }
295
296 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
297 {
298 sdata->vif.bss_conf.use_cts_prot = false;
299 sdata->vif.bss_conf.use_short_preamble = false;
300 sdata->vif.bss_conf.use_short_slot = false;
301 return BSS_CHANGED_ERP_CTS_PROT |
302 BSS_CHANGED_ERP_PREAMBLE |
303 BSS_CHANGED_ERP_SLOT;
304 }
305
306 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
307 struct sk_buff *skb)
308 {
309 struct ieee80211_local *local = hw_to_local(hw);
310 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
311 int tmp;
312
313 skb->dev = local->mdev;
314 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
315 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
316 &local->skb_queue : &local->skb_queue_unreliable, skb);
317 tmp = skb_queue_len(&local->skb_queue) +
318 skb_queue_len(&local->skb_queue_unreliable);
319 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
320 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
321 dev_kfree_skb_irq(skb);
322 tmp--;
323 I802_DEBUG_INC(local->tx_status_drop);
324 }
325 tasklet_schedule(&local->tasklet);
326 }
327 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
328
329 static void ieee80211_tasklet_handler(unsigned long data)
330 {
331 struct ieee80211_local *local = (struct ieee80211_local *) data;
332 struct sk_buff *skb;
333 struct ieee80211_rx_status rx_status;
334 struct ieee80211_ra_tid *ra_tid;
335
336 while ((skb = skb_dequeue(&local->skb_queue)) ||
337 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
338 switch (skb->pkt_type) {
339 case IEEE80211_RX_MSG:
340 /* status is in skb->cb */
341 memcpy(&rx_status, skb->cb, sizeof(rx_status));
342 /* Clear skb->pkt_type in order to not confuse kernel
343 * netstack. */
344 skb->pkt_type = 0;
345 __ieee80211_rx(local_to_hw(local), skb, &rx_status);
346 break;
347 case IEEE80211_TX_STATUS_MSG:
348 skb->pkt_type = 0;
349 ieee80211_tx_status(local_to_hw(local), skb);
350 break;
351 case IEEE80211_DELBA_MSG:
352 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
353 ieee80211_stop_tx_ba_cb(local_to_hw(local),
354 ra_tid->ra, ra_tid->tid);
355 dev_kfree_skb(skb);
356 break;
357 case IEEE80211_ADDBA_MSG:
358 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
359 ieee80211_start_tx_ba_cb(local_to_hw(local),
360 ra_tid->ra, ra_tid->tid);
361 dev_kfree_skb(skb);
362 break ;
363 default:
364 WARN(1, "mac80211: Packet is of unknown type %d\n",
365 skb->pkt_type);
366 dev_kfree_skb(skb);
367 break;
368 }
369 }
370 }
371
372 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
373 struct sta_info *sta,
374 struct sk_buff *skb)
375 {
376 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
377
378 sta->tx_filtered_count++;
379
380 /*
381 * Clear the TX filter mask for this STA when sending the next
382 * packet. If the STA went to power save mode, this will happen
383 * when it wakes up for the next time.
384 */
385 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
386
387 /*
388 * This code races in the following way:
389 *
390 * (1) STA sends frame indicating it will go to sleep and does so
391 * (2) hardware/firmware adds STA to filter list, passes frame up
392 * (3) hardware/firmware processes TX fifo and suppresses a frame
393 * (4) we get TX status before having processed the frame and
394 * knowing that the STA has gone to sleep.
395 *
396 * This is actually quite unlikely even when both those events are
397 * processed from interrupts coming in quickly after one another or
398 * even at the same time because we queue both TX status events and
399 * RX frames to be processed by a tasklet and process them in the
400 * same order that they were received or TX status last. Hence, there
401 * is no race as long as the frame RX is processed before the next TX
402 * status, which drivers can ensure, see below.
403 *
404 * Note that this can only happen if the hardware or firmware can
405 * actually add STAs to the filter list, if this is done by the
406 * driver in response to set_tim() (which will only reduce the race
407 * this whole filtering tries to solve, not completely solve it)
408 * this situation cannot happen.
409 *
410 * To completely solve this race drivers need to make sure that they
411 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
412 * functions and
413 * (b) always process RX events before TX status events if ordering
414 * can be unknown, for example with different interrupt status
415 * bits.
416 */
417 if (test_sta_flags(sta, WLAN_STA_PS) &&
418 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
419 skb_queue_tail(&sta->tx_filtered, skb);
420 return;
421 }
422
423 if (!test_sta_flags(sta, WLAN_STA_PS) &&
424 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
425 /* Software retry the packet once */
426 info->flags |= IEEE80211_TX_INTFL_RETRIED;
427 ieee80211_add_pending_skb(local, skb);
428 return;
429 }
430
431 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
432 if (net_ratelimit())
433 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
434 "queue_len=%d PS=%d @%lu\n",
435 wiphy_name(local->hw.wiphy),
436 skb_queue_len(&sta->tx_filtered),
437 !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
438 #endif
439 dev_kfree_skb(skb);
440 }
441
442 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
443 {
444 struct sk_buff *skb2;
445 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
446 struct ieee80211_local *local = hw_to_local(hw);
447 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
448 u16 frag, type;
449 __le16 fc;
450 struct ieee80211_supported_band *sband;
451 struct ieee80211_tx_status_rtap_hdr *rthdr;
452 struct ieee80211_sub_if_data *sdata;
453 struct net_device *prev_dev = NULL;
454 struct sta_info *sta;
455 int retry_count = -1, i;
456
457 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
458 /* the HW cannot have attempted that rate */
459 if (i >= hw->max_rates) {
460 info->status.rates[i].idx = -1;
461 info->status.rates[i].count = 0;
462 }
463
464 retry_count += info->status.rates[i].count;
465 }
466 if (retry_count < 0)
467 retry_count = 0;
468
469 rcu_read_lock();
470
471 sband = local->hw.wiphy->bands[info->band];
472
473 sta = sta_info_get(local, hdr->addr1);
474
475 if (sta) {
476 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
477 test_sta_flags(sta, WLAN_STA_PS)) {
478 /*
479 * The STA is in power save mode, so assume
480 * that this TX packet failed because of that.
481 */
482 ieee80211_handle_filtered_frame(local, sta, skb);
483 rcu_read_unlock();
484 return;
485 }
486
487 fc = hdr->frame_control;
488
489 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
490 (ieee80211_is_data_qos(fc))) {
491 u16 tid, ssn;
492 u8 *qc;
493
494 qc = ieee80211_get_qos_ctl(hdr);
495 tid = qc[0] & 0xf;
496 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
497 & IEEE80211_SCTL_SEQ);
498 ieee80211_send_bar(sta->sdata, hdr->addr1,
499 tid, ssn);
500 }
501
502 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
503 ieee80211_handle_filtered_frame(local, sta, skb);
504 rcu_read_unlock();
505 return;
506 } else {
507 if (!(info->flags & IEEE80211_TX_STAT_ACK))
508 sta->tx_retry_failed++;
509 sta->tx_retry_count += retry_count;
510 }
511
512 rate_control_tx_status(local, sband, sta, skb);
513 }
514
515 rcu_read_unlock();
516
517 ieee80211_led_tx(local, 0);
518
519 /* SNMP counters
520 * Fragments are passed to low-level drivers as separate skbs, so these
521 * are actually fragments, not frames. Update frame counters only for
522 * the first fragment of the frame. */
523
524 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
525 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
526
527 if (info->flags & IEEE80211_TX_STAT_ACK) {
528 if (frag == 0) {
529 local->dot11TransmittedFrameCount++;
530 if (is_multicast_ether_addr(hdr->addr1))
531 local->dot11MulticastTransmittedFrameCount++;
532 if (retry_count > 0)
533 local->dot11RetryCount++;
534 if (retry_count > 1)
535 local->dot11MultipleRetryCount++;
536 }
537
538 /* This counter shall be incremented for an acknowledged MPDU
539 * with an individual address in the address 1 field or an MPDU
540 * with a multicast address in the address 1 field of type Data
541 * or Management. */
542 if (!is_multicast_ether_addr(hdr->addr1) ||
543 type == IEEE80211_FTYPE_DATA ||
544 type == IEEE80211_FTYPE_MGMT)
545 local->dot11TransmittedFragmentCount++;
546 } else {
547 if (frag == 0)
548 local->dot11FailedCount++;
549 }
550
551 /* this was a transmitted frame, but now we want to reuse it */
552 skb_orphan(skb);
553
554 /*
555 * This is a bit racy but we can avoid a lot of work
556 * with this test...
557 */
558 if (!local->monitors && !local->cooked_mntrs) {
559 dev_kfree_skb(skb);
560 return;
561 }
562
563 /* send frame to monitor interfaces now */
564
565 if (skb_headroom(skb) < sizeof(*rthdr)) {
566 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
567 dev_kfree_skb(skb);
568 return;
569 }
570
571 rthdr = (struct ieee80211_tx_status_rtap_hdr *)
572 skb_push(skb, sizeof(*rthdr));
573
574 memset(rthdr, 0, sizeof(*rthdr));
575 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
576 rthdr->hdr.it_present =
577 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
578 (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
579 (1 << IEEE80211_RADIOTAP_RATE));
580
581 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
582 !is_multicast_ether_addr(hdr->addr1))
583 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
584
585 /*
586 * XXX: Once radiotap gets the bitmap reset thing the vendor
587 * extensions proposal contains, we can actually report
588 * the whole set of tries we did.
589 */
590 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
591 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
592 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
593 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
594 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
595 if (info->status.rates[0].idx >= 0 &&
596 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
597 rthdr->rate = sband->bitrates[
598 info->status.rates[0].idx].bitrate / 5;
599
600 /* for now report the total retry_count */
601 rthdr->data_retries = retry_count;
602
603 /* XXX: is this sufficient for BPF? */
604 skb_set_mac_header(skb, 0);
605 skb->ip_summed = CHECKSUM_UNNECESSARY;
606 skb->pkt_type = PACKET_OTHERHOST;
607 skb->protocol = htons(ETH_P_802_2);
608 memset(skb->cb, 0, sizeof(skb->cb));
609
610 rcu_read_lock();
611 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
612 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
613 if (!netif_running(sdata->dev))
614 continue;
615
616 if (prev_dev) {
617 skb2 = skb_clone(skb, GFP_ATOMIC);
618 if (skb2) {
619 skb2->dev = prev_dev;
620 netif_rx(skb2);
621 }
622 }
623
624 prev_dev = sdata->dev;
625 }
626 }
627 if (prev_dev) {
628 skb->dev = prev_dev;
629 netif_rx(skb);
630 skb = NULL;
631 }
632 rcu_read_unlock();
633 dev_kfree_skb(skb);
634 }
635 EXPORT_SYMBOL(ieee80211_tx_status);
636
637 static void ieee80211_restart_work(struct work_struct *work)
638 {
639 struct ieee80211_local *local =
640 container_of(work, struct ieee80211_local, restart_work);
641
642 rtnl_lock();
643 ieee80211_reconfig(local);
644 rtnl_unlock();
645 }
646
647 void ieee80211_restart_hw(struct ieee80211_hw *hw)
648 {
649 struct ieee80211_local *local = hw_to_local(hw);
650
651 /* use this reason, __ieee80211_resume will unblock it */
652 ieee80211_stop_queues_by_reason(hw,
653 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
654
655 schedule_work(&local->restart_work);
656 }
657 EXPORT_SYMBOL(ieee80211_restart_hw);
658
659 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
660 const struct ieee80211_ops *ops)
661 {
662 struct ieee80211_local *local;
663 int priv_size, i;
664 struct wiphy *wiphy;
665
666 /* Ensure 32-byte alignment of our private data and hw private data.
667 * We use the wiphy priv data for both our ieee80211_local and for
668 * the driver's private data
669 *
670 * In memory it'll be like this:
671 *
672 * +-------------------------+
673 * | struct wiphy |
674 * +-------------------------+
675 * | struct ieee80211_local |
676 * +-------------------------+
677 * | driver's private data |
678 * +-------------------------+
679 *
680 */
681 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
682
683 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
684
685 if (!wiphy)
686 return NULL;
687
688 wiphy->privid = mac80211_wiphy_privid;
689
690 /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
691 wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
692 sizeof(struct cfg80211_bss);
693
694 local = wiphy_priv(wiphy);
695
696 local->hw.wiphy = wiphy;
697
698 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
699
700 BUG_ON(!ops->tx);
701 BUG_ON(!ops->start);
702 BUG_ON(!ops->stop);
703 BUG_ON(!ops->config);
704 BUG_ON(!ops->add_interface);
705 BUG_ON(!ops->remove_interface);
706 BUG_ON(!ops->configure_filter);
707 local->ops = ops;
708
709 /* set up some defaults */
710 local->hw.queues = 1;
711 local->hw.max_rates = 1;
712 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
713 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
714 local->hw.conf.radio_enabled = true;
715 local->user_power_level = -1;
716
717 INIT_LIST_HEAD(&local->interfaces);
718 mutex_init(&local->iflist_mtx);
719 mutex_init(&local->scan_mtx);
720
721 spin_lock_init(&local->key_lock);
722
723 spin_lock_init(&local->queue_stop_reason_lock);
724
725 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
726
727 INIT_WORK(&local->restart_work, ieee80211_restart_work);
728
729 INIT_WORK(&local->dynamic_ps_enable_work,
730 ieee80211_dynamic_ps_enable_work);
731 INIT_WORK(&local->dynamic_ps_disable_work,
732 ieee80211_dynamic_ps_disable_work);
733 setup_timer(&local->dynamic_ps_timer,
734 ieee80211_dynamic_ps_timer, (unsigned long) local);
735
736 sta_info_init(local);
737
738 for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
739 skb_queue_head_init(&local->pending[i]);
740 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
741 (unsigned long)local);
742 tasklet_disable(&local->tx_pending_tasklet);
743
744 tasklet_init(&local->tasklet,
745 ieee80211_tasklet_handler,
746 (unsigned long) local);
747 tasklet_disable(&local->tasklet);
748
749 skb_queue_head_init(&local->skb_queue);
750 skb_queue_head_init(&local->skb_queue_unreliable);
751
752 spin_lock_init(&local->ampdu_lock);
753
754 return local_to_hw(local);
755 }
756 EXPORT_SYMBOL(ieee80211_alloc_hw);
757
758 static const struct net_device_ops ieee80211_master_ops = {
759 .ndo_start_xmit = ieee80211_master_start_xmit,
760 .ndo_open = ieee80211_master_open,
761 .ndo_stop = ieee80211_master_stop,
762 .ndo_set_multicast_list = ieee80211_master_set_multicast_list,
763 .ndo_select_queue = ieee80211_select_queue,
764 };
765
766 static void ieee80211_master_setup(struct net_device *mdev)
767 {
768 mdev->type = ARPHRD_IEEE80211;
769 mdev->netdev_ops = &ieee80211_master_ops;
770 mdev->header_ops = &ieee80211_header_ops;
771 mdev->tx_queue_len = 1000;
772 mdev->addr_len = ETH_ALEN;
773 }
774
775 int ieee80211_register_hw(struct ieee80211_hw *hw)
776 {
777 struct ieee80211_local *local = hw_to_local(hw);
778 int result;
779 enum ieee80211_band band;
780 struct net_device *mdev;
781 struct ieee80211_master_priv *mpriv;
782 int channels, i, j, max_bitrates;
783 bool supp_ht;
784 static const u32 cipher_suites[] = {
785 WLAN_CIPHER_SUITE_WEP40,
786 WLAN_CIPHER_SUITE_WEP104,
787 WLAN_CIPHER_SUITE_TKIP,
788 WLAN_CIPHER_SUITE_CCMP,
789
790 /* keep last -- depends on hw flags! */
791 WLAN_CIPHER_SUITE_AES_CMAC
792 };
793
794 /*
795 * generic code guarantees at least one band,
796 * set this very early because much code assumes
797 * that hw.conf.channel is assigned
798 */
799 channels = 0;
800 max_bitrates = 0;
801 supp_ht = false;
802 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
803 struct ieee80211_supported_band *sband;
804
805 sband = local->hw.wiphy->bands[band];
806 if (!sband)
807 continue;
808 if (!local->oper_channel) {
809 /* init channel we're on */
810 local->hw.conf.channel =
811 local->oper_channel = &sband->channels[0];
812 local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
813 }
814 channels += sband->n_channels;
815
816 if (max_bitrates < sband->n_bitrates)
817 max_bitrates = sband->n_bitrates;
818 supp_ht = supp_ht || sband->ht_cap.ht_supported;
819 }
820
821 local->int_scan_req.n_channels = channels;
822 local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
823 if (!local->int_scan_req.channels)
824 return -ENOMEM;
825
826 /* if low-level driver supports AP, we also support VLAN */
827 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
828 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
829
830 /* mac80211 always supports monitor */
831 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
832
833 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
834 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
835 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
836 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
837
838 /*
839 * Calculate scan IE length -- we need this to alloc
840 * memory and to subtract from the driver limit. It
841 * includes the (extended) supported rates and HT
842 * information -- SSID is the driver's responsibility.
843 */
844 local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
845 if (supp_ht)
846 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
847
848 if (!local->ops->hw_scan) {
849 /* For hw_scan, driver needs to set these up. */
850 local->hw.wiphy->max_scan_ssids = 4;
851 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
852 }
853
854 /*
855 * If the driver supports any scan IEs, then assume the
856 * limit includes the IEs mac80211 will add, otherwise
857 * leave it at zero and let the driver sort it out; we
858 * still pass our IEs to the driver but userspace will
859 * not be allowed to in that case.
860 */
861 if (local->hw.wiphy->max_scan_ie_len)
862 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
863
864 local->hw.wiphy->cipher_suites = cipher_suites;
865 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
866 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
867 local->hw.wiphy->n_cipher_suites--;
868
869 result = wiphy_register(local->hw.wiphy);
870 if (result < 0)
871 goto fail_wiphy_register;
872
873 /*
874 * We use the number of queues for feature tests (QoS, HT) internally
875 * so restrict them appropriately.
876 */
877 if (hw->queues > IEEE80211_MAX_QUEUES)
878 hw->queues = IEEE80211_MAX_QUEUES;
879
880 mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
881 "wmaster%d", ieee80211_master_setup,
882 hw->queues);
883 if (!mdev)
884 goto fail_mdev_alloc;
885
886 mpriv = netdev_priv(mdev);
887 mpriv->local = local;
888 local->mdev = mdev;
889
890 local->hw.workqueue =
891 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
892 if (!local->hw.workqueue) {
893 result = -ENOMEM;
894 goto fail_workqueue;
895 }
896
897 /*
898 * The hardware needs headroom for sending the frame,
899 * and we need some headroom for passing the frame to monitor
900 * interfaces, but never both at the same time.
901 */
902 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
903 sizeof(struct ieee80211_tx_status_rtap_hdr));
904
905 debugfs_hw_add(local);
906
907 if (local->hw.max_listen_interval == 0)
908 local->hw.max_listen_interval = 1;
909
910 local->hw.conf.listen_interval = local->hw.max_listen_interval;
911
912 result = sta_info_start(local);
913 if (result < 0)
914 goto fail_sta_info;
915
916 result = ieee80211_wep_init(local);
917 if (result < 0) {
918 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
919 wiphy_name(local->hw.wiphy), result);
920 goto fail_wep;
921 }
922
923 rtnl_lock();
924 result = dev_alloc_name(local->mdev, local->mdev->name);
925 if (result < 0)
926 goto fail_dev;
927
928 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
929 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
930 local->mdev->features |= NETIF_F_NETNS_LOCAL;
931
932 result = register_netdevice(local->mdev);
933 if (result < 0)
934 goto fail_dev;
935
936 result = ieee80211_init_rate_ctrl_alg(local,
937 hw->rate_control_algorithm);
938 if (result < 0) {
939 printk(KERN_DEBUG "%s: Failed to initialize rate control "
940 "algorithm\n", wiphy_name(local->hw.wiphy));
941 goto fail_rate;
942 }
943
944 /* add one default STA interface if supported */
945 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
946 result = ieee80211_if_add(local, "wlan%d", NULL,
947 NL80211_IFTYPE_STATION, NULL);
948 if (result)
949 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
950 wiphy_name(local->hw.wiphy));
951 }
952
953 rtnl_unlock();
954
955 ieee80211_led_init(local);
956
957 /* alloc internal scan request */
958 i = 0;
959 local->int_scan_req.ssids = &local->scan_ssid;
960 local->int_scan_req.n_ssids = 1;
961 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
962 if (!hw->wiphy->bands[band])
963 continue;
964 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
965 local->int_scan_req.channels[i] =
966 &hw->wiphy->bands[band]->channels[j];
967 i++;
968 }
969 }
970
971 local->network_latency_notifier.notifier_call =
972 ieee80211_max_network_latency;
973 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
974 &local->network_latency_notifier);
975
976 if (result) {
977 rtnl_lock();
978 goto fail_pm_qos;
979 }
980
981 return 0;
982
983 fail_pm_qos:
984 ieee80211_led_exit(local);
985 ieee80211_remove_interfaces(local);
986 fail_rate:
987 unregister_netdevice(local->mdev);
988 local->mdev = NULL;
989 fail_dev:
990 rtnl_unlock();
991 ieee80211_wep_free(local);
992 fail_wep:
993 sta_info_stop(local);
994 fail_sta_info:
995 debugfs_hw_del(local);
996 destroy_workqueue(local->hw.workqueue);
997 fail_workqueue:
998 if (local->mdev)
999 free_netdev(local->mdev);
1000 fail_mdev_alloc:
1001 wiphy_unregister(local->hw.wiphy);
1002 fail_wiphy_register:
1003 kfree(local->int_scan_req.channels);
1004 return result;
1005 }
1006 EXPORT_SYMBOL(ieee80211_register_hw);
1007
1008 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1009 {
1010 struct ieee80211_local *local = hw_to_local(hw);
1011
1012 tasklet_kill(&local->tx_pending_tasklet);
1013 tasklet_kill(&local->tasklet);
1014
1015 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1016 &local->network_latency_notifier);
1017
1018 rtnl_lock();
1019
1020 /*
1021 * At this point, interface list manipulations are fine
1022 * because the driver cannot be handing us frames any
1023 * more and the tasklet is killed.
1024 */
1025
1026 /* First, we remove all virtual interfaces. */
1027 ieee80211_remove_interfaces(local);
1028
1029 /* then, finally, remove the master interface */
1030 unregister_netdevice(local->mdev);
1031
1032 rtnl_unlock();
1033
1034 ieee80211_clear_tx_pending(local);
1035 sta_info_stop(local);
1036 rate_control_deinitialize(local);
1037 debugfs_hw_del(local);
1038
1039 if (skb_queue_len(&local->skb_queue)
1040 || skb_queue_len(&local->skb_queue_unreliable))
1041 printk(KERN_WARNING "%s: skb_queue not empty\n",
1042 wiphy_name(local->hw.wiphy));
1043 skb_queue_purge(&local->skb_queue);
1044 skb_queue_purge(&local->skb_queue_unreliable);
1045
1046 destroy_workqueue(local->hw.workqueue);
1047 wiphy_unregister(local->hw.wiphy);
1048 ieee80211_wep_free(local);
1049 ieee80211_led_exit(local);
1050 free_netdev(local->mdev);
1051 kfree(local->int_scan_req.channels);
1052 }
1053 EXPORT_SYMBOL(ieee80211_unregister_hw);
1054
1055 void ieee80211_free_hw(struct ieee80211_hw *hw)
1056 {
1057 struct ieee80211_local *local = hw_to_local(hw);
1058
1059 mutex_destroy(&local->iflist_mtx);
1060 mutex_destroy(&local->scan_mtx);
1061
1062 wiphy_free(local->hw.wiphy);
1063 }
1064 EXPORT_SYMBOL(ieee80211_free_hw);
1065
1066 static int __init ieee80211_init(void)
1067 {
1068 struct sk_buff *skb;
1069 int ret;
1070
1071 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1072 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1073 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1074
1075 ret = rc80211_minstrel_init();
1076 if (ret)
1077 return ret;
1078
1079 ret = rc80211_pid_init();
1080 if (ret)
1081 return ret;
1082
1083 ieee80211_debugfs_netdev_init();
1084
1085 return 0;
1086 }
1087
1088 static void __exit ieee80211_exit(void)
1089 {
1090 rc80211_pid_exit();
1091 rc80211_minstrel_exit();
1092
1093 /*
1094 * For key todo, it'll be empty by now but the work
1095 * might still be scheduled.
1096 */
1097 flush_scheduled_work();
1098
1099 if (mesh_allocated)
1100 ieee80211s_stop();
1101
1102 ieee80211_debugfs_netdev_exit();
1103 }
1104
1105
1106 subsys_initcall(ieee80211_init);
1107 module_exit(ieee80211_exit);
1108
1109 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1110 MODULE_LICENSE("GPL");
Linux with added FPC-III support