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mac80211: remove WARN_ON() from ieee80211_hw_config
[linux-2.6/kvm.git] / net / mac80211 / main.c
blobdf7e9a810b888ac9983f6830210456c28c27d085
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 else if (sdata->vif.type == NL80211_IFTYPE_AP)
177 conf.bssid = sdata->dev->dev_addr;
178 else if (ieee80211_vif_is_mesh(&sdata->vif)) {
179 u8 zero[ETH_ALEN] = { 0 };
180 conf.bssid = zero;
181 } else {
182 WARN_ON(1);
183 return -EINVAL;
184 }
185
186 if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
187 return -EINVAL;
188
189 return local->ops->config_interface(local_to_hw(local),
190 &sdata->vif, &conf);
191 }
192
193 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
194 {
195 struct ieee80211_channel *chan;
196 int ret = 0;
197 int power;
198 enum nl80211_sec_chan_offset sec_chan_offset;
199
200 might_sleep();
201
202 if (local->sw_scanning) {
203 chan = local->scan_channel;
204 sec_chan_offset = NL80211_SEC_CHAN_NO_HT;
205 } else {
206 chan = local->oper_channel;
207 sec_chan_offset = local->oper_sec_chan_offset;
208 }
209
210 if (chan != local->hw.conf.channel ||
211 sec_chan_offset != local->hw.conf.ht.sec_chan_offset) {
212 local->hw.conf.channel = chan;
213 switch (sec_chan_offset) {
214 case NL80211_SEC_CHAN_NO_HT:
215 local->hw.conf.ht.enabled = false;
216 local->hw.conf.ht.sec_chan_offset = 0;
217 break;
218 case NL80211_SEC_CHAN_DISABLED:
219 local->hw.conf.ht.enabled = true;
220 local->hw.conf.ht.sec_chan_offset = 0;
221 break;
222 case NL80211_SEC_CHAN_BELOW:
223 local->hw.conf.ht.enabled = true;
224 local->hw.conf.ht.sec_chan_offset = -1;
225 break;
226 case NL80211_SEC_CHAN_ABOVE:
227 local->hw.conf.ht.enabled = true;
228 local->hw.conf.ht.sec_chan_offset = 1;
229 break;
230 }
231 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
232 }
233
234 if (!local->hw.conf.power_level)
235 power = chan->max_power;
236 else
237 power = min(chan->max_power, local->hw.conf.power_level);
238 if (local->hw.conf.power_level != power) {
239 changed |= IEEE80211_CONF_CHANGE_POWER;
240 local->hw.conf.power_level = power;
241 }
242
243 if (changed && local->open_count) {
244 ret = local->ops->config(local_to_hw(local), changed);
245 /*
246 * Goal:
247 * HW reconfiguration should never fail, the driver has told
248 * us what it can support so it should live up to that promise.
249 *
250 * Current status:
251 * rfkill is not integrated with mac80211 and a
252 * configuration command can thus fail if hardware rfkill
253 * is enabled
254 *
255 * FIXME: integrate rfkill with mac80211 and then add this
256 * WARN_ON() back
257 *
258 */
259 /* WARN_ON(ret); */
260 }
261
262 return ret;
263 }
264
265 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
266 u32 changed)
267 {
268 struct ieee80211_local *local = sdata->local;
269
270 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
271 return;
272
273 if (!changed)
274 return;
275
276 if (local->ops->bss_info_changed)
277 local->ops->bss_info_changed(local_to_hw(local),
278 &sdata->vif,
279 &sdata->vif.bss_conf,
280 changed);
281 }
282
283 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
284 {
285 sdata->vif.bss_conf.use_cts_prot = false;
286 sdata->vif.bss_conf.use_short_preamble = false;
287 sdata->vif.bss_conf.use_short_slot = false;
288 return BSS_CHANGED_ERP_CTS_PROT |
289 BSS_CHANGED_ERP_PREAMBLE |
290 BSS_CHANGED_ERP_SLOT;
291 }
292
293 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
294 struct sk_buff *skb)
295 {
296 struct ieee80211_local *local = hw_to_local(hw);
297 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
298 int tmp;
299
300 skb->dev = local->mdev;
301 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
302 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
303 &local->skb_queue : &local->skb_queue_unreliable, skb);
304 tmp = skb_queue_len(&local->skb_queue) +
305 skb_queue_len(&local->skb_queue_unreliable);
306 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
307 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
308 dev_kfree_skb_irq(skb);
309 tmp--;
310 I802_DEBUG_INC(local->tx_status_drop);
311 }
312 tasklet_schedule(&local->tasklet);
313 }
314 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
315
316 static void ieee80211_tasklet_handler(unsigned long data)
317 {
318 struct ieee80211_local *local = (struct ieee80211_local *) data;
319 struct sk_buff *skb;
320 struct ieee80211_rx_status rx_status;
321 struct ieee80211_ra_tid *ra_tid;
322
323 while ((skb = skb_dequeue(&local->skb_queue)) ||
324 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
325 switch (skb->pkt_type) {
326 case IEEE80211_RX_MSG:
327 /* status is in skb->cb */
328 memcpy(&rx_status, skb->cb, sizeof(rx_status));
329 /* Clear skb->pkt_type in order to not confuse kernel
330 * netstack. */
331 skb->pkt_type = 0;
332 __ieee80211_rx(local_to_hw(local), skb, &rx_status);
333 break;
334 case IEEE80211_TX_STATUS_MSG:
335 skb->pkt_type = 0;
336 ieee80211_tx_status(local_to_hw(local), skb);
337 break;
338 case IEEE80211_DELBA_MSG:
339 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
340 ieee80211_stop_tx_ba_cb(local_to_hw(local),
341 ra_tid->ra, ra_tid->tid);
342 dev_kfree_skb(skb);
343 break;
344 case IEEE80211_ADDBA_MSG:
345 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
346 ieee80211_start_tx_ba_cb(local_to_hw(local),
347 ra_tid->ra, ra_tid->tid);
348 dev_kfree_skb(skb);
349 break ;
350 default:
351 WARN_ON(1);
352 dev_kfree_skb(skb);
353 break;
354 }
355 }
356 }
357
358 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
359 * make a prepared TX frame (one that has been given to hw) to look like brand
360 * new IEEE 802.11 frame that is ready to go through TX processing again.
361 */
362 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
363 struct ieee80211_key *key,
364 struct sk_buff *skb)
365 {
366 unsigned int hdrlen, iv_len, mic_len;
367 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
368
369 hdrlen = ieee80211_hdrlen(hdr->frame_control);
370
371 if (!key)
372 goto no_key;
373
374 switch (key->conf.alg) {
375 case ALG_WEP:
376 iv_len = WEP_IV_LEN;
377 mic_len = WEP_ICV_LEN;
378 break;
379 case ALG_TKIP:
380 iv_len = TKIP_IV_LEN;
381 mic_len = TKIP_ICV_LEN;
382 break;
383 case ALG_CCMP:
384 iv_len = CCMP_HDR_LEN;
385 mic_len = CCMP_MIC_LEN;
386 break;
387 default:
388 goto no_key;
389 }
390
391 if (skb->len >= hdrlen + mic_len &&
392 !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
393 skb_trim(skb, skb->len - mic_len);
394 if (skb->len >= hdrlen + iv_len) {
395 memmove(skb->data + iv_len, skb->data, hdrlen);
396 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
397 }
398
399 no_key:
400 if (ieee80211_is_data_qos(hdr->frame_control)) {
401 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
402 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
403 hdrlen - IEEE80211_QOS_CTL_LEN);
404 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
405 }
406 }
407
408 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
409 struct sta_info *sta,
410 struct sk_buff *skb)
411 {
412 sta->tx_filtered_count++;
413
414 /*
415 * Clear the TX filter mask for this STA when sending the next
416 * packet. If the STA went to power save mode, this will happen
417 * when it wakes up for the next time.
418 */
419 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
420
421 /*
422 * This code races in the following way:
423 *
424 * (1) STA sends frame indicating it will go to sleep and does so
425 * (2) hardware/firmware adds STA to filter list, passes frame up
426 * (3) hardware/firmware processes TX fifo and suppresses a frame
427 * (4) we get TX status before having processed the frame and
428 * knowing that the STA has gone to sleep.
429 *
430 * This is actually quite unlikely even when both those events are
431 * processed from interrupts coming in quickly after one another or
432 * even at the same time because we queue both TX status events and
433 * RX frames to be processed by a tasklet and process them in the
434 * same order that they were received or TX status last. Hence, there
435 * is no race as long as the frame RX is processed before the next TX
436 * status, which drivers can ensure, see below.
437 *
438 * Note that this can only happen if the hardware or firmware can
439 * actually add STAs to the filter list, if this is done by the
440 * driver in response to set_tim() (which will only reduce the race
441 * this whole filtering tries to solve, not completely solve it)
442 * this situation cannot happen.
443 *
444 * To completely solve this race drivers need to make sure that they
445 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
446 * functions and
447 * (b) always process RX events before TX status events if ordering
448 * can be unknown, for example with different interrupt status
449 * bits.
450 */
451 if (test_sta_flags(sta, WLAN_STA_PS) &&
452 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
453 ieee80211_remove_tx_extra(local, sta->key, skb);
454 skb_queue_tail(&sta->tx_filtered, skb);
455 return;
456 }
457
458 if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
459 /* Software retry the packet once */
460 skb->requeue = 1;
461 ieee80211_remove_tx_extra(local, sta->key, skb);
462 dev_queue_xmit(skb);
463 return;
464 }
465
466 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
467 if (net_ratelimit())
468 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
469 "queue_len=%d PS=%d @%lu\n",
470 wiphy_name(local->hw.wiphy),
471 skb_queue_len(&sta->tx_filtered),
472 !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
473 #endif
474 dev_kfree_skb(skb);
475 }
476
477 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
478 {
479 struct sk_buff *skb2;
480 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
481 struct ieee80211_local *local = hw_to_local(hw);
482 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
483 u16 frag, type;
484 __le16 fc;
485 struct ieee80211_supported_band *sband;
486 struct ieee80211_tx_status_rtap_hdr *rthdr;
487 struct ieee80211_sub_if_data *sdata;
488 struct net_device *prev_dev = NULL;
489 struct sta_info *sta;
490 int retry_count = -1, i;
491
492 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
493 /* the HW cannot have attempted that rate */
494 if (i >= hw->max_rates) {
495 info->status.rates[i].idx = -1;
496 info->status.rates[i].count = 0;
497 }
498
499 retry_count += info->status.rates[i].count;
500 }
501 if (retry_count < 0)
502 retry_count = 0;
503
504 rcu_read_lock();
505
506 sband = local->hw.wiphy->bands[info->band];
507
508 sta = sta_info_get(local, hdr->addr1);
509
510 if (sta) {
511 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
512 test_sta_flags(sta, WLAN_STA_PS)) {
513 /*
514 * The STA is in power save mode, so assume
515 * that this TX packet failed because of that.
516 */
517 ieee80211_handle_filtered_frame(local, sta, skb);
518 rcu_read_unlock();
519 return;
520 }
521
522 fc = hdr->frame_control;
523
524 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
525 (ieee80211_is_data_qos(fc))) {
526 u16 tid, ssn;
527 u8 *qc;
528
529 qc = ieee80211_get_qos_ctl(hdr);
530 tid = qc[0] & 0xf;
531 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
532 & IEEE80211_SCTL_SEQ);
533 ieee80211_send_bar(sta->sdata, hdr->addr1,
534 tid, ssn);
535 }
536
537 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
538 ieee80211_handle_filtered_frame(local, sta, skb);
539 rcu_read_unlock();
540 return;
541 } else {
542 if (!(info->flags & IEEE80211_TX_STAT_ACK))
543 sta->tx_retry_failed++;
544 sta->tx_retry_count += retry_count;
545 }
546
547 rate_control_tx_status(local, sband, sta, skb);
548 }
549
550 rcu_read_unlock();
551
552 ieee80211_led_tx(local, 0);
553
554 /* SNMP counters
555 * Fragments are passed to low-level drivers as separate skbs, so these
556 * are actually fragments, not frames. Update frame counters only for
557 * the first fragment of the frame. */
558
559 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
560 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
561
562 if (info->flags & IEEE80211_TX_STAT_ACK) {
563 if (frag == 0) {
564 local->dot11TransmittedFrameCount++;
565 if (is_multicast_ether_addr(hdr->addr1))
566 local->dot11MulticastTransmittedFrameCount++;
567 if (retry_count > 0)
568 local->dot11RetryCount++;
569 if (retry_count > 1)
570 local->dot11MultipleRetryCount++;
571 }
572
573 /* This counter shall be incremented for an acknowledged MPDU
574 * with an individual address in the address 1 field or an MPDU
575 * with a multicast address in the address 1 field of type Data
576 * or Management. */
577 if (!is_multicast_ether_addr(hdr->addr1) ||
578 type == IEEE80211_FTYPE_DATA ||
579 type == IEEE80211_FTYPE_MGMT)
580 local->dot11TransmittedFragmentCount++;
581 } else {
582 if (frag == 0)
583 local->dot11FailedCount++;
584 }
585
586 /* this was a transmitted frame, but now we want to reuse it */
587 skb_orphan(skb);
588
589 /*
590 * This is a bit racy but we can avoid a lot of work
591 * with this test...
592 */
593 if (!local->monitors && !local->cooked_mntrs) {
594 dev_kfree_skb(skb);
595 return;
596 }
597
598 /* send frame to monitor interfaces now */
599
600 if (skb_headroom(skb) < sizeof(*rthdr)) {
601 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
602 dev_kfree_skb(skb);
603 return;
604 }
605
606 rthdr = (struct ieee80211_tx_status_rtap_hdr *)
607 skb_push(skb, sizeof(*rthdr));
608
609 memset(rthdr, 0, sizeof(*rthdr));
610 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
611 rthdr->hdr.it_present =
612 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
613 (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
614 (1 << IEEE80211_RADIOTAP_RATE));
615
616 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
617 !is_multicast_ether_addr(hdr->addr1))
618 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
619
620 /*
621 * XXX: Once radiotap gets the bitmap reset thing the vendor
622 * extensions proposal contains, we can actually report
623 * the whole set of tries we did.
624 */
625 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
626 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
627 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
628 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
629 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
630 if (info->status.rates[0].idx >= 0 &&
631 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
632 rthdr->rate = sband->bitrates[
633 info->status.rates[0].idx].bitrate / 5;
634
635 /* for now report the total retry_count */
636 rthdr->data_retries = retry_count;
637
638 /* XXX: is this sufficient for BPF? */
639 skb_set_mac_header(skb, 0);
640 skb->ip_summed = CHECKSUM_UNNECESSARY;
641 skb->pkt_type = PACKET_OTHERHOST;
642 skb->protocol = htons(ETH_P_802_2);
643 memset(skb->cb, 0, sizeof(skb->cb));
644
645 rcu_read_lock();
646 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
647 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
648 if (!netif_running(sdata->dev))
649 continue;
650
651 if (prev_dev) {
652 skb2 = skb_clone(skb, GFP_ATOMIC);
653 if (skb2) {
654 skb2->dev = prev_dev;
655 netif_rx(skb2);
656 }
657 }
658
659 prev_dev = sdata->dev;
660 }
661 }
662 if (prev_dev) {
663 skb->dev = prev_dev;
664 netif_rx(skb);
665 skb = NULL;
666 }
667 rcu_read_unlock();
668 dev_kfree_skb(skb);
669 }
670 EXPORT_SYMBOL(ieee80211_tx_status);
671
672 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
673 const struct ieee80211_ops *ops)
674 {
675 struct ieee80211_local *local;
676 int priv_size;
677 struct wiphy *wiphy;
678
679 /* Ensure 32-byte alignment of our private data and hw private data.
680 * We use the wiphy priv data for both our ieee80211_local and for
681 * the driver's private data
682 *
683 * In memory it'll be like this:
684 *
685 * +-------------------------+
686 * | struct wiphy |
687 * +-------------------------+
688 * | struct ieee80211_local |
689 * +-------------------------+
690 * | driver's private data |
691 * +-------------------------+
692 *
693 */
694 priv_size = ((sizeof(struct ieee80211_local) +
695 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
696 priv_data_len;
697
698 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
699
700 if (!wiphy)
701 return NULL;
702
703 wiphy->privid = mac80211_wiphy_privid;
704
705 local = wiphy_priv(wiphy);
706 local->hw.wiphy = wiphy;
707
708 local->hw.priv = (char *)local +
709 ((sizeof(struct ieee80211_local) +
710 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
711
712 BUG_ON(!ops->tx);
713 BUG_ON(!ops->start);
714 BUG_ON(!ops->stop);
715 BUG_ON(!ops->config);
716 BUG_ON(!ops->add_interface);
717 BUG_ON(!ops->remove_interface);
718 BUG_ON(!ops->configure_filter);
719 local->ops = ops;
720
721 /* set up some defaults */
722 local->hw.queues = 1;
723 local->hw.max_rates = 1;
724 local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
725 local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
726 local->hw.conf.long_frame_max_tx_count = 4;
727 local->hw.conf.short_frame_max_tx_count = 7;
728 local->hw.conf.radio_enabled = true;
729
730 INIT_LIST_HEAD(&local->interfaces);
731
732 spin_lock_init(&local->key_lock);
733
734 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
735
736 sta_info_init(local);
737
738 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
739 (unsigned long)local);
740 tasklet_disable(&local->tx_pending_tasklet);
741
742 tasklet_init(&local->tasklet,
743 ieee80211_tasklet_handler,
744 (unsigned long) local);
745 tasklet_disable(&local->tasklet);
746
747 skb_queue_head_init(&local->skb_queue);
748 skb_queue_head_init(&local->skb_queue_unreliable);
749
750 return local_to_hw(local);
751 }
752 EXPORT_SYMBOL(ieee80211_alloc_hw);
753
754 int ieee80211_register_hw(struct ieee80211_hw *hw)
755 {
756 struct ieee80211_local *local = hw_to_local(hw);
757 int result;
758 enum ieee80211_band band;
759 struct net_device *mdev;
760 struct ieee80211_master_priv *mpriv;
761
762 /*
763 * generic code guarantees at least one band,
764 * set this very early because much code assumes
765 * that hw.conf.channel is assigned
766 */
767 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
768 struct ieee80211_supported_band *sband;
769
770 sband = local->hw.wiphy->bands[band];
771 if (sband) {
772 /* init channel we're on */
773 local->hw.conf.channel =
774 local->oper_channel =
775 local->scan_channel = &sband->channels[0];
776 break;
777 }
778 }
779
780 /* if low-level driver supports AP, we also support VLAN */
781 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
782 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
783
784 /* mac80211 always supports monitor */
785 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
786
787 result = wiphy_register(local->hw.wiphy);
788 if (result < 0)
789 return result;
790
791 /*
792 * We use the number of queues for feature tests (QoS, HT) internally
793 * so restrict them appropriately.
794 */
795 if (hw->queues > IEEE80211_MAX_QUEUES)
796 hw->queues = IEEE80211_MAX_QUEUES;
797 if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
798 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
799 if (hw->queues < 4)
800 hw->ampdu_queues = 0;
801
802 mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
803 "wmaster%d", ether_setup,
804 ieee80211_num_queues(hw));
805 if (!mdev)
806 goto fail_mdev_alloc;
807
808 mpriv = netdev_priv(mdev);
809 mpriv->local = local;
810 local->mdev = mdev;
811
812 ieee80211_rx_bss_list_init(local);
813
814 mdev->hard_start_xmit = ieee80211_master_start_xmit;
815 mdev->open = ieee80211_master_open;
816 mdev->stop = ieee80211_master_stop;
817 mdev->type = ARPHRD_IEEE80211;
818 mdev->header_ops = &ieee80211_header_ops;
819 mdev->set_multicast_list = ieee80211_master_set_multicast_list;
820
821 local->hw.workqueue =
822 create_freezeable_workqueue(wiphy_name(local->hw.wiphy));
823 if (!local->hw.workqueue) {
824 result = -ENOMEM;
825 goto fail_workqueue;
826 }
827
828 /*
829 * The hardware needs headroom for sending the frame,
830 * and we need some headroom for passing the frame to monitor
831 * interfaces, but never both at the same time.
832 */
833 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
834 sizeof(struct ieee80211_tx_status_rtap_hdr));
835
836 debugfs_hw_add(local);
837
838 if (local->hw.conf.beacon_int < 10)
839 local->hw.conf.beacon_int = 100;
840
841 if (local->hw.max_listen_interval == 0)
842 local->hw.max_listen_interval = 1;
843
844 local->hw.conf.listen_interval = local->hw.max_listen_interval;
845
846 local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
847 IEEE80211_HW_SIGNAL_DB |
848 IEEE80211_HW_SIGNAL_DBM) ?
849 IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
850 local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
851 IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
852 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
853 local->wstats_flags |= IW_QUAL_DBM;
854
855 result = sta_info_start(local);
856 if (result < 0)
857 goto fail_sta_info;
858
859 rtnl_lock();
860 result = dev_alloc_name(local->mdev, local->mdev->name);
861 if (result < 0)
862 goto fail_dev;
863
864 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
865 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
866
867 result = register_netdevice(local->mdev);
868 if (result < 0)
869 goto fail_dev;
870
871 result = ieee80211_init_rate_ctrl_alg(local,
872 hw->rate_control_algorithm);
873 if (result < 0) {
874 printk(KERN_DEBUG "%s: Failed to initialize rate control "
875 "algorithm\n", wiphy_name(local->hw.wiphy));
876 goto fail_rate;
877 }
878
879 result = ieee80211_wep_init(local);
880
881 if (result < 0) {
882 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
883 wiphy_name(local->hw.wiphy), result);
884 goto fail_wep;
885 }
886
887 local->mdev->select_queue = ieee80211_select_queue;
888
889 /* add one default STA interface */
890 result = ieee80211_if_add(local, "wlan%d", NULL,
891 NL80211_IFTYPE_STATION, NULL);
892 if (result)
893 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
894 wiphy_name(local->hw.wiphy));
895
896 rtnl_unlock();
897
898 ieee80211_led_init(local);
899
900 return 0;
901
902 fail_wep:
903 rate_control_deinitialize(local);
904 fail_rate:
905 unregister_netdevice(local->mdev);
906 local->mdev = NULL;
907 fail_dev:
908 rtnl_unlock();
909 sta_info_stop(local);
910 fail_sta_info:
911 debugfs_hw_del(local);
912 destroy_workqueue(local->hw.workqueue);
913 fail_workqueue:
914 if (local->mdev)
915 free_netdev(local->mdev);
916 fail_mdev_alloc:
917 wiphy_unregister(local->hw.wiphy);
918 return result;
919 }
920 EXPORT_SYMBOL(ieee80211_register_hw);
921
922 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
923 {
924 struct ieee80211_local *local = hw_to_local(hw);
925
926 tasklet_kill(&local->tx_pending_tasklet);
927 tasklet_kill(&local->tasklet);
928
929 rtnl_lock();
930
931 /*
932 * At this point, interface list manipulations are fine
933 * because the driver cannot be handing us frames any
934 * more and the tasklet is killed.
935 */
936
937 /* First, we remove all virtual interfaces. */
938 ieee80211_remove_interfaces(local);
939
940 /* then, finally, remove the master interface */
941 unregister_netdevice(local->mdev);
942
943 rtnl_unlock();
944
945 ieee80211_rx_bss_list_deinit(local);
946 ieee80211_clear_tx_pending(local);
947 sta_info_stop(local);
948 rate_control_deinitialize(local);
949 debugfs_hw_del(local);
950
951 if (skb_queue_len(&local->skb_queue)
952 || skb_queue_len(&local->skb_queue_unreliable))
953 printk(KERN_WARNING "%s: skb_queue not empty\n",
954 wiphy_name(local->hw.wiphy));
955 skb_queue_purge(&local->skb_queue);
956 skb_queue_purge(&local->skb_queue_unreliable);
957
958 destroy_workqueue(local->hw.workqueue);
959 wiphy_unregister(local->hw.wiphy);
960 ieee80211_wep_free(local);
961 ieee80211_led_exit(local);
962 free_netdev(local->mdev);
963 }
964 EXPORT_SYMBOL(ieee80211_unregister_hw);
965
966 void ieee80211_free_hw(struct ieee80211_hw *hw)
967 {
968 struct ieee80211_local *local = hw_to_local(hw);
969
970 wiphy_free(local->hw.wiphy);
971 }
972 EXPORT_SYMBOL(ieee80211_free_hw);
973
974 static int __init ieee80211_init(void)
975 {
976 struct sk_buff *skb;
977 int ret;
978
979 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
980 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
981 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
982
983 ret = rc80211_minstrel_init();
984 if (ret)
985 return ret;
986
987 ret = rc80211_pid_init();
988 if (ret)
989 return ret;
990
991 ieee80211_debugfs_netdev_init();
992
993 return 0;
994 }
995
996 static void __exit ieee80211_exit(void)
997 {
998 rc80211_pid_exit();
999 rc80211_minstrel_exit();
1000
1001 /*
1002 * For key todo, it'll be empty by now but the work
1003 * might still be scheduled.
1004 */
1005 flush_scheduled_work();
1006
1007 if (mesh_allocated)
1008 ieee80211s_stop();
1009
1010 ieee80211_debugfs_netdev_exit();
1011 }
1012
1013
1014 subsys_initcall(ieee80211_init);
1015 module_exit(ieee80211_exit);
1016
1017 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1018 MODULE_LICENSE("GPL");
kernel-based virtual machine