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mdio: Add 10GBASE-T SNR register definition
[linux-2.6/verdex.git] / net / mac80211 / main.c
blobb80bc80e46cf9822417107128440b99955b21397
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;
158 int ret = 0;
159 int power;
160 enum nl80211_channel_type channel_type;
161
162 might_sleep();
163
164 if (local->sw_scanning) {
165 chan = local->scan_channel;
166 channel_type = NL80211_CHAN_NO_HT;
167 } else {
168 chan = local->oper_channel;
169 channel_type = local->oper_channel_type;
170 }
171
172 if (chan != local->hw.conf.channel ||
173 channel_type != local->hw.conf.channel_type) {
174 local->hw.conf.channel = chan;
175 local->hw.conf.channel_type = channel_type;
176 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
177 }
178
179 if (local->sw_scanning)
180 power = chan->max_power;
181 else
182 power = local->power_constr_level ?
183 (chan->max_power - local->power_constr_level) :
184 chan->max_power;
185
186 if (local->user_power_level >= 0)
187 power = min(power, local->user_power_level);
188
189 if (local->hw.conf.power_level != power) {
190 changed |= IEEE80211_CONF_CHANGE_POWER;
191 local->hw.conf.power_level = power;
192 }
193
194 if (changed && local->open_count) {
195 ret = drv_config(local, changed);
196 /*
197 * Goal:
198 * HW reconfiguration should never fail, the driver has told
199 * us what it can support so it should live up to that promise.
200 *
201 * Current status:
202 * rfkill is not integrated with mac80211 and a
203 * configuration command can thus fail if hardware rfkill
204 * is enabled
205 *
206 * FIXME: integrate rfkill with mac80211 and then add this
207 * WARN_ON() back
208 *
209 */
210 /* WARN_ON(ret); */
211 }
212
213 return ret;
214 }
215
216 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
217 u32 changed)
218 {
219 struct ieee80211_local *local = sdata->local;
220
221 if (!changed)
222 return;
223
224 if (sdata->vif.type == NL80211_IFTYPE_STATION)
225 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
226 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
227 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
228 else if (sdata->vif.type == NL80211_IFTYPE_AP)
229 sdata->vif.bss_conf.bssid = sdata->dev->dev_addr;
230 else if (ieee80211_vif_is_mesh(&sdata->vif)) {
231 static const u8 zero[ETH_ALEN] = { 0 };
232 sdata->vif.bss_conf.bssid = zero;
233 } else {
234 WARN_ON(1);
235 return;
236 }
237
238 switch (sdata->vif.type) {
239 case NL80211_IFTYPE_AP:
240 case NL80211_IFTYPE_ADHOC:
241 case NL80211_IFTYPE_MESH_POINT:
242 break;
243 default:
244 /* do not warn to simplify caller in scan.c */
245 changed &= ~BSS_CHANGED_BEACON_ENABLED;
246 if (WARN_ON(changed & BSS_CHANGED_BEACON))
247 return;
248 break;
249 }
250
251 if (changed & BSS_CHANGED_BEACON_ENABLED) {
252 if (local->sw_scanning) {
253 sdata->vif.bss_conf.enable_beacon = false;
254 } else {
255 /*
256 * Beacon should be enabled, but AP mode must
257 * check whether there is a beacon configured.
258 */
259 switch (sdata->vif.type) {
260 case NL80211_IFTYPE_AP:
261 sdata->vif.bss_conf.enable_beacon =
262 !!rcu_dereference(sdata->u.ap.beacon);
263 break;
264 case NL80211_IFTYPE_ADHOC:
265 sdata->vif.bss_conf.enable_beacon =
266 !!rcu_dereference(sdata->u.ibss.presp);
267 break;
268 case NL80211_IFTYPE_MESH_POINT:
269 sdata->vif.bss_conf.enable_beacon = true;
270 break;
271 default:
272 /* not reached */
273 WARN_ON(1);
274 break;
275 }
276 }
277 }
278
279 drv_bss_info_changed(local, &sdata->vif,
280 &sdata->vif.bss_conf, changed);
281
282 /*
283 * DEPRECATED
284 *
285 * ~changed is just there to not do this at resume time
286 */
287 if (changed & BSS_CHANGED_BEACON_INT && ~changed) {
288 local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int;
289 ieee80211_hw_config(local,
290 _IEEE80211_CONF_CHANGE_BEACON_INTERVAL);
291 }
292 }
293
294 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
295 {
296 sdata->vif.bss_conf.use_cts_prot = false;
297 sdata->vif.bss_conf.use_short_preamble = false;
298 sdata->vif.bss_conf.use_short_slot = false;
299 return BSS_CHANGED_ERP_CTS_PROT |
300 BSS_CHANGED_ERP_PREAMBLE |
301 BSS_CHANGED_ERP_SLOT;
302 }
303
304 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
305 struct sk_buff *skb)
306 {
307 struct ieee80211_local *local = hw_to_local(hw);
308 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
309 int tmp;
310
311 skb->dev = local->mdev;
312 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
313 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
314 &local->skb_queue : &local->skb_queue_unreliable, skb);
315 tmp = skb_queue_len(&local->skb_queue) +
316 skb_queue_len(&local->skb_queue_unreliable);
317 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
318 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
319 dev_kfree_skb_irq(skb);
320 tmp--;
321 I802_DEBUG_INC(local->tx_status_drop);
322 }
323 tasklet_schedule(&local->tasklet);
324 }
325 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
326
327 static void ieee80211_tasklet_handler(unsigned long data)
328 {
329 struct ieee80211_local *local = (struct ieee80211_local *) data;
330 struct sk_buff *skb;
331 struct ieee80211_rx_status rx_status;
332 struct ieee80211_ra_tid *ra_tid;
333
334 while ((skb = skb_dequeue(&local->skb_queue)) ||
335 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
336 switch (skb->pkt_type) {
337 case IEEE80211_RX_MSG:
338 /* status is in skb->cb */
339 memcpy(&rx_status, skb->cb, sizeof(rx_status));
340 /* Clear skb->pkt_type in order to not confuse kernel
341 * netstack. */
342 skb->pkt_type = 0;
343 __ieee80211_rx(local_to_hw(local), skb, &rx_status);
344 break;
345 case IEEE80211_TX_STATUS_MSG:
346 skb->pkt_type = 0;
347 ieee80211_tx_status(local_to_hw(local), skb);
348 break;
349 case IEEE80211_DELBA_MSG:
350 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
351 ieee80211_stop_tx_ba_cb(local_to_hw(local),
352 ra_tid->ra, ra_tid->tid);
353 dev_kfree_skb(skb);
354 break;
355 case IEEE80211_ADDBA_MSG:
356 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
357 ieee80211_start_tx_ba_cb(local_to_hw(local),
358 ra_tid->ra, ra_tid->tid);
359 dev_kfree_skb(skb);
360 break ;
361 default:
362 WARN(1, "mac80211: Packet is of unknown type %d\n",
363 skb->pkt_type);
364 dev_kfree_skb(skb);
365 break;
366 }
367 }
368 }
369
370 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
371 * make a prepared TX frame (one that has been given to hw) to look like brand
372 * new IEEE 802.11 frame that is ready to go through TX processing again.
373 */
374 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
375 struct ieee80211_key *key,
376 struct sk_buff *skb)
377 {
378 unsigned int hdrlen, iv_len, mic_len;
379 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
380
381 hdrlen = ieee80211_hdrlen(hdr->frame_control);
382
383 if (!key)
384 goto no_key;
385
386 switch (key->conf.alg) {
387 case ALG_WEP:
388 iv_len = WEP_IV_LEN;
389 mic_len = WEP_ICV_LEN;
390 break;
391 case ALG_TKIP:
392 iv_len = TKIP_IV_LEN;
393 mic_len = TKIP_ICV_LEN;
394 break;
395 case ALG_CCMP:
396 iv_len = CCMP_HDR_LEN;
397 mic_len = CCMP_MIC_LEN;
398 break;
399 default:
400 goto no_key;
401 }
402
403 if (skb->len >= hdrlen + mic_len &&
404 !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
405 skb_trim(skb, skb->len - mic_len);
406 if (skb->len >= hdrlen + iv_len) {
407 memmove(skb->data + iv_len, skb->data, hdrlen);
408 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
409 }
410
411 no_key:
412 if (ieee80211_is_data_qos(hdr->frame_control)) {
413 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
414 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
415 hdrlen - IEEE80211_QOS_CTL_LEN);
416 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
417 }
418 }
419
420 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
421 struct sta_info *sta,
422 struct sk_buff *skb)
423 {
424 sta->tx_filtered_count++;
425
426 /*
427 * Clear the TX filter mask for this STA when sending the next
428 * packet. If the STA went to power save mode, this will happen
429 * when it wakes up for the next time.
430 */
431 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
432
433 /*
434 * This code races in the following way:
435 *
436 * (1) STA sends frame indicating it will go to sleep and does so
437 * (2) hardware/firmware adds STA to filter list, passes frame up
438 * (3) hardware/firmware processes TX fifo and suppresses a frame
439 * (4) we get TX status before having processed the frame and
440 * knowing that the STA has gone to sleep.
441 *
442 * This is actually quite unlikely even when both those events are
443 * processed from interrupts coming in quickly after one another or
444 * even at the same time because we queue both TX status events and
445 * RX frames to be processed by a tasklet and process them in the
446 * same order that they were received or TX status last. Hence, there
447 * is no race as long as the frame RX is processed before the next TX
448 * status, which drivers can ensure, see below.
449 *
450 * Note that this can only happen if the hardware or firmware can
451 * actually add STAs to the filter list, if this is done by the
452 * driver in response to set_tim() (which will only reduce the race
453 * this whole filtering tries to solve, not completely solve it)
454 * this situation cannot happen.
455 *
456 * To completely solve this race drivers need to make sure that they
457 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
458 * functions and
459 * (b) always process RX events before TX status events if ordering
460 * can be unknown, for example with different interrupt status
461 * bits.
462 */
463 if (test_sta_flags(sta, WLAN_STA_PS) &&
464 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
465 ieee80211_remove_tx_extra(local, sta->key, skb);
466 skb_queue_tail(&sta->tx_filtered, skb);
467 return;
468 }
469
470 if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
471 /* Software retry the packet once */
472 skb->requeue = 1;
473 ieee80211_remove_tx_extra(local, sta->key, skb);
474 dev_queue_xmit(skb);
475 return;
476 }
477
478 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
479 if (net_ratelimit())
480 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
481 "queue_len=%d PS=%d @%lu\n",
482 wiphy_name(local->hw.wiphy),
483 skb_queue_len(&sta->tx_filtered),
484 !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
485 #endif
486 dev_kfree_skb(skb);
487 }
488
489 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
490 {
491 struct sk_buff *skb2;
492 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
493 struct ieee80211_local *local = hw_to_local(hw);
494 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
495 u16 frag, type;
496 __le16 fc;
497 struct ieee80211_supported_band *sband;
498 struct ieee80211_tx_status_rtap_hdr *rthdr;
499 struct ieee80211_sub_if_data *sdata;
500 struct net_device *prev_dev = NULL;
501 struct sta_info *sta;
502 int retry_count = -1, i;
503
504 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
505 /* the HW cannot have attempted that rate */
506 if (i >= hw->max_rates) {
507 info->status.rates[i].idx = -1;
508 info->status.rates[i].count = 0;
509 }
510
511 retry_count += info->status.rates[i].count;
512 }
513 if (retry_count < 0)
514 retry_count = 0;
515
516 rcu_read_lock();
517
518 sband = local->hw.wiphy->bands[info->band];
519
520 sta = sta_info_get(local, hdr->addr1);
521
522 if (sta) {
523 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
524 test_sta_flags(sta, WLAN_STA_PS)) {
525 /*
526 * The STA is in power save mode, so assume
527 * that this TX packet failed because of that.
528 */
529 ieee80211_handle_filtered_frame(local, sta, skb);
530 rcu_read_unlock();
531 return;
532 }
533
534 fc = hdr->frame_control;
535
536 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
537 (ieee80211_is_data_qos(fc))) {
538 u16 tid, ssn;
539 u8 *qc;
540
541 qc = ieee80211_get_qos_ctl(hdr);
542 tid = qc[0] & 0xf;
543 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
544 & IEEE80211_SCTL_SEQ);
545 ieee80211_send_bar(sta->sdata, hdr->addr1,
546 tid, ssn);
547 }
548
549 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
550 ieee80211_handle_filtered_frame(local, sta, skb);
551 rcu_read_unlock();
552 return;
553 } else {
554 if (!(info->flags & IEEE80211_TX_STAT_ACK))
555 sta->tx_retry_failed++;
556 sta->tx_retry_count += retry_count;
557 }
558
559 rate_control_tx_status(local, sband, sta, skb);
560 }
561
562 rcu_read_unlock();
563
564 ieee80211_led_tx(local, 0);
565
566 /* SNMP counters
567 * Fragments are passed to low-level drivers as separate skbs, so these
568 * are actually fragments, not frames. Update frame counters only for
569 * the first fragment of the frame. */
570
571 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
572 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
573
574 if (info->flags & IEEE80211_TX_STAT_ACK) {
575 if (frag == 0) {
576 local->dot11TransmittedFrameCount++;
577 if (is_multicast_ether_addr(hdr->addr1))
578 local->dot11MulticastTransmittedFrameCount++;
579 if (retry_count > 0)
580 local->dot11RetryCount++;
581 if (retry_count > 1)
582 local->dot11MultipleRetryCount++;
583 }
584
585 /* This counter shall be incremented for an acknowledged MPDU
586 * with an individual address in the address 1 field or an MPDU
587 * with a multicast address in the address 1 field of type Data
588 * or Management. */
589 if (!is_multicast_ether_addr(hdr->addr1) ||
590 type == IEEE80211_FTYPE_DATA ||
591 type == IEEE80211_FTYPE_MGMT)
592 local->dot11TransmittedFragmentCount++;
593 } else {
594 if (frag == 0)
595 local->dot11FailedCount++;
596 }
597
598 /* this was a transmitted frame, but now we want to reuse it */
599 skb_orphan(skb);
600
601 /*
602 * This is a bit racy but we can avoid a lot of work
603 * with this test...
604 */
605 if (!local->monitors && !local->cooked_mntrs) {
606 dev_kfree_skb(skb);
607 return;
608 }
609
610 /* send frame to monitor interfaces now */
611
612 if (skb_headroom(skb) < sizeof(*rthdr)) {
613 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
614 dev_kfree_skb(skb);
615 return;
616 }
617
618 rthdr = (struct ieee80211_tx_status_rtap_hdr *)
619 skb_push(skb, sizeof(*rthdr));
620
621 memset(rthdr, 0, sizeof(*rthdr));
622 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
623 rthdr->hdr.it_present =
624 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
625 (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
626 (1 << IEEE80211_RADIOTAP_RATE));
627
628 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
629 !is_multicast_ether_addr(hdr->addr1))
630 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
631
632 /*
633 * XXX: Once radiotap gets the bitmap reset thing the vendor
634 * extensions proposal contains, we can actually report
635 * the whole set of tries we did.
636 */
637 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
638 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
639 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
640 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
641 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
642 if (info->status.rates[0].idx >= 0 &&
643 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
644 rthdr->rate = sband->bitrates[
645 info->status.rates[0].idx].bitrate / 5;
646
647 /* for now report the total retry_count */
648 rthdr->data_retries = retry_count;
649
650 /* XXX: is this sufficient for BPF? */
651 skb_set_mac_header(skb, 0);
652 skb->ip_summed = CHECKSUM_UNNECESSARY;
653 skb->pkt_type = PACKET_OTHERHOST;
654 skb->protocol = htons(ETH_P_802_2);
655 memset(skb->cb, 0, sizeof(skb->cb));
656
657 rcu_read_lock();
658 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
659 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
660 if (!netif_running(sdata->dev))
661 continue;
662
663 if (prev_dev) {
664 skb2 = skb_clone(skb, GFP_ATOMIC);
665 if (skb2) {
666 skb2->dev = prev_dev;
667 netif_rx(skb2);
668 }
669 }
670
671 prev_dev = sdata->dev;
672 }
673 }
674 if (prev_dev) {
675 skb->dev = prev_dev;
676 netif_rx(skb);
677 skb = NULL;
678 }
679 rcu_read_unlock();
680 dev_kfree_skb(skb);
681 }
682 EXPORT_SYMBOL(ieee80211_tx_status);
683
684 static void ieee80211_restart_work(struct work_struct *work)
685 {
686 struct ieee80211_local *local =
687 container_of(work, struct ieee80211_local, restart_work);
688
689 rtnl_lock();
690 ieee80211_reconfig(local);
691 rtnl_unlock();
692 }
693
694 void ieee80211_restart_hw(struct ieee80211_hw *hw)
695 {
696 struct ieee80211_local *local = hw_to_local(hw);
697
698 /* use this reason, __ieee80211_resume will unblock it */
699 ieee80211_stop_queues_by_reason(hw,
700 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
701
702 schedule_work(&local->restart_work);
703 }
704 EXPORT_SYMBOL(ieee80211_restart_hw);
705
706 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
707 const struct ieee80211_ops *ops)
708 {
709 struct ieee80211_local *local;
710 int priv_size, i;
711 struct wiphy *wiphy;
712
713 /* Ensure 32-byte alignment of our private data and hw private data.
714 * We use the wiphy priv data for both our ieee80211_local and for
715 * the driver's private data
716 *
717 * In memory it'll be like this:
718 *
719 * +-------------------------+
720 * | struct wiphy |
721 * +-------------------------+
722 * | struct ieee80211_local |
723 * +-------------------------+
724 * | driver's private data |
725 * +-------------------------+
726 *
727 */
728 priv_size = ((sizeof(struct ieee80211_local) +
729 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
730 priv_data_len;
731
732 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
733
734 if (!wiphy)
735 return NULL;
736
737 wiphy->privid = mac80211_wiphy_privid;
738
739 /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
740 wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
741 sizeof(struct cfg80211_bss);
742
743 local = wiphy_priv(wiphy);
744
745 local->hw.wiphy = wiphy;
746
747 local->hw.priv = (char *)local +
748 ((sizeof(struct ieee80211_local) +
749 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
750
751 BUG_ON(!ops->tx);
752 BUG_ON(!ops->start);
753 BUG_ON(!ops->stop);
754 BUG_ON(!ops->config);
755 BUG_ON(!ops->add_interface);
756 BUG_ON(!ops->remove_interface);
757 BUG_ON(!ops->configure_filter);
758 local->ops = ops;
759
760 /* set up some defaults */
761 local->hw.queues = 1;
762 local->hw.max_rates = 1;
763 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
764 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
765 local->hw.conf.radio_enabled = true;
766 local->user_power_level = -1;
767
768 INIT_LIST_HEAD(&local->interfaces);
769 mutex_init(&local->iflist_mtx);
770 mutex_init(&local->scan_mtx);
771
772 spin_lock_init(&local->key_lock);
773
774 spin_lock_init(&local->queue_stop_reason_lock);
775
776 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
777
778 INIT_WORK(&local->restart_work, ieee80211_restart_work);
779
780 INIT_WORK(&local->dynamic_ps_enable_work,
781 ieee80211_dynamic_ps_enable_work);
782 INIT_WORK(&local->dynamic_ps_disable_work,
783 ieee80211_dynamic_ps_disable_work);
784 setup_timer(&local->dynamic_ps_timer,
785 ieee80211_dynamic_ps_timer, (unsigned long) local);
786
787 sta_info_init(local);
788
789 for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
790 skb_queue_head_init(&local->pending[i]);
791 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
792 (unsigned long)local);
793 tasklet_disable(&local->tx_pending_tasklet);
794
795 tasklet_init(&local->tasklet,
796 ieee80211_tasklet_handler,
797 (unsigned long) local);
798 tasklet_disable(&local->tasklet);
799
800 skb_queue_head_init(&local->skb_queue);
801 skb_queue_head_init(&local->skb_queue_unreliable);
802
803 spin_lock_init(&local->ampdu_lock);
804
805 return local_to_hw(local);
806 }
807 EXPORT_SYMBOL(ieee80211_alloc_hw);
808
809 static const struct net_device_ops ieee80211_master_ops = {
810 .ndo_start_xmit = ieee80211_master_start_xmit,
811 .ndo_open = ieee80211_master_open,
812 .ndo_stop = ieee80211_master_stop,
813 .ndo_set_multicast_list = ieee80211_master_set_multicast_list,
814 .ndo_select_queue = ieee80211_select_queue,
815 };
816
817 static void ieee80211_master_setup(struct net_device *mdev)
818 {
819 mdev->type = ARPHRD_IEEE80211;
820 mdev->netdev_ops = &ieee80211_master_ops;
821 mdev->header_ops = &ieee80211_header_ops;
822 mdev->tx_queue_len = 1000;
823 mdev->addr_len = ETH_ALEN;
824 }
825
826 int ieee80211_register_hw(struct ieee80211_hw *hw)
827 {
828 struct ieee80211_local *local = hw_to_local(hw);
829 int result;
830 enum ieee80211_band band;
831 struct net_device *mdev;
832 struct ieee80211_master_priv *mpriv;
833 int channels, i, j, max_bitrates;
834 bool supp_ht;
835 static const u32 cipher_suites[] = {
836 WLAN_CIPHER_SUITE_WEP40,
837 WLAN_CIPHER_SUITE_WEP104,
838 WLAN_CIPHER_SUITE_TKIP,
839 WLAN_CIPHER_SUITE_CCMP,
840
841 /* keep last -- depends on hw flags! */
842 WLAN_CIPHER_SUITE_AES_CMAC
843 };
844
845 /*
846 * generic code guarantees at least one band,
847 * set this very early because much code assumes
848 * that hw.conf.channel is assigned
849 */
850 channels = 0;
851 max_bitrates = 0;
852 supp_ht = false;
853 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
854 struct ieee80211_supported_band *sband;
855
856 sband = local->hw.wiphy->bands[band];
857 if (!sband)
858 continue;
859 if (!local->oper_channel) {
860 /* init channel we're on */
861 local->hw.conf.channel =
862 local->oper_channel =
863 local->scan_channel = &sband->channels[0];
864 }
865 channels += sband->n_channels;
866
867 if (max_bitrates < sband->n_bitrates)
868 max_bitrates = sband->n_bitrates;
869 supp_ht = supp_ht || sband->ht_cap.ht_supported;
870 }
871
872 local->int_scan_req.n_channels = channels;
873 local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
874 if (!local->int_scan_req.channels)
875 return -ENOMEM;
876
877 /* if low-level driver supports AP, we also support VLAN */
878 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
879 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
880
881 /* mac80211 always supports monitor */
882 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
883
884 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
885 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
886 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
887 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
888
889 /*
890 * Calculate scan IE length -- we need this to alloc
891 * memory and to subtract from the driver limit. It
892 * includes the (extended) supported rates and HT
893 * information -- SSID is the driver's responsibility.
894 */
895 local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
896 if (supp_ht)
897 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
898
899 if (!local->ops->hw_scan) {
900 /* For hw_scan, driver needs to set these up. */
901 local->hw.wiphy->max_scan_ssids = 4;
902 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
903 }
904
905 /*
906 * If the driver supports any scan IEs, then assume the
907 * limit includes the IEs mac80211 will add, otherwise
908 * leave it at zero and let the driver sort it out; we
909 * still pass our IEs to the driver but userspace will
910 * not be allowed to in that case.
911 */
912 if (local->hw.wiphy->max_scan_ie_len)
913 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
914
915 local->hw.wiphy->cipher_suites = cipher_suites;
916 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
917 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
918 local->hw.wiphy->n_cipher_suites--;
919
920 result = wiphy_register(local->hw.wiphy);
921 if (result < 0)
922 goto fail_wiphy_register;
923
924 /*
925 * We use the number of queues for feature tests (QoS, HT) internally
926 * so restrict them appropriately.
927 */
928 if (hw->queues > IEEE80211_MAX_QUEUES)
929 hw->queues = IEEE80211_MAX_QUEUES;
930
931 mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
932 "wmaster%d", ieee80211_master_setup,
933 hw->queues);
934 if (!mdev)
935 goto fail_mdev_alloc;
936
937 mpriv = netdev_priv(mdev);
938 mpriv->local = local;
939 local->mdev = mdev;
940
941 local->hw.workqueue =
942 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
943 if (!local->hw.workqueue) {
944 result = -ENOMEM;
945 goto fail_workqueue;
946 }
947
948 /*
949 * The hardware needs headroom for sending the frame,
950 * and we need some headroom for passing the frame to monitor
951 * interfaces, but never both at the same time.
952 */
953 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
954 sizeof(struct ieee80211_tx_status_rtap_hdr));
955
956 debugfs_hw_add(local);
957
958 if (local->hw.max_listen_interval == 0)
959 local->hw.max_listen_interval = 1;
960
961 local->hw.conf.listen_interval = local->hw.max_listen_interval;
962
963 result = sta_info_start(local);
964 if (result < 0)
965 goto fail_sta_info;
966
967 result = ieee80211_wep_init(local);
968 if (result < 0) {
969 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
970 wiphy_name(local->hw.wiphy), result);
971 goto fail_wep;
972 }
973
974 rtnl_lock();
975 result = dev_alloc_name(local->mdev, local->mdev->name);
976 if (result < 0)
977 goto fail_dev;
978
979 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
980 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
981 local->mdev->features |= NETIF_F_NETNS_LOCAL;
982
983 result = register_netdevice(local->mdev);
984 if (result < 0)
985 goto fail_dev;
986
987 result = ieee80211_init_rate_ctrl_alg(local,
988 hw->rate_control_algorithm);
989 if (result < 0) {
990 printk(KERN_DEBUG "%s: Failed to initialize rate control "
991 "algorithm\n", wiphy_name(local->hw.wiphy));
992 goto fail_rate;
993 }
994
995 /* add one default STA interface if supported */
996 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
997 result = ieee80211_if_add(local, "wlan%d", NULL,
998 NL80211_IFTYPE_STATION, NULL);
999 if (result)
1000 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1001 wiphy_name(local->hw.wiphy));
1002 }
1003
1004 rtnl_unlock();
1005
1006 ieee80211_led_init(local);
1007
1008 /* alloc internal scan request */
1009 i = 0;
1010 local->int_scan_req.ssids = &local->scan_ssid;
1011 local->int_scan_req.n_ssids = 1;
1012 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1013 if (!hw->wiphy->bands[band])
1014 continue;
1015 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
1016 local->int_scan_req.channels[i] =
1017 &hw->wiphy->bands[band]->channels[j];
1018 i++;
1019 }
1020 }
1021
1022 local->network_latency_notifier.notifier_call =
1023 ieee80211_max_network_latency;
1024 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
1025 &local->network_latency_notifier);
1026
1027 if (result) {
1028 rtnl_lock();
1029 goto fail_pm_qos;
1030 }
1031
1032 return 0;
1033
1034 fail_pm_qos:
1035 ieee80211_led_exit(local);
1036 ieee80211_remove_interfaces(local);
1037 fail_rate:
1038 unregister_netdevice(local->mdev);
1039 local->mdev = NULL;
1040 fail_dev:
1041 rtnl_unlock();
1042 ieee80211_wep_free(local);
1043 fail_wep:
1044 sta_info_stop(local);
1045 fail_sta_info:
1046 debugfs_hw_del(local);
1047 destroy_workqueue(local->hw.workqueue);
1048 fail_workqueue:
1049 if (local->mdev)
1050 free_netdev(local->mdev);
1051 fail_mdev_alloc:
1052 wiphy_unregister(local->hw.wiphy);
1053 fail_wiphy_register:
1054 kfree(local->int_scan_req.channels);
1055 return result;
1056 }
1057 EXPORT_SYMBOL(ieee80211_register_hw);
1058
1059 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1060 {
1061 struct ieee80211_local *local = hw_to_local(hw);
1062
1063 tasklet_kill(&local->tx_pending_tasklet);
1064 tasklet_kill(&local->tasklet);
1065
1066 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1067 &local->network_latency_notifier);
1068
1069 rtnl_lock();
1070
1071 /*
1072 * At this point, interface list manipulations are fine
1073 * because the driver cannot be handing us frames any
1074 * more and the tasklet is killed.
1075 */
1076
1077 /* First, we remove all virtual interfaces. */
1078 ieee80211_remove_interfaces(local);
1079
1080 /* then, finally, remove the master interface */
1081 unregister_netdevice(local->mdev);
1082
1083 rtnl_unlock();
1084
1085 ieee80211_clear_tx_pending(local);
1086 sta_info_stop(local);
1087 rate_control_deinitialize(local);
1088 debugfs_hw_del(local);
1089
1090 if (skb_queue_len(&local->skb_queue)
1091 || skb_queue_len(&local->skb_queue_unreliable))
1092 printk(KERN_WARNING "%s: skb_queue not empty\n",
1093 wiphy_name(local->hw.wiphy));
1094 skb_queue_purge(&local->skb_queue);
1095 skb_queue_purge(&local->skb_queue_unreliable);
1096
1097 destroy_workqueue(local->hw.workqueue);
1098 wiphy_unregister(local->hw.wiphy);
1099 ieee80211_wep_free(local);
1100 ieee80211_led_exit(local);
1101 free_netdev(local->mdev);
1102 kfree(local->int_scan_req.channels);
1103 }
1104 EXPORT_SYMBOL(ieee80211_unregister_hw);
1105
1106 void ieee80211_free_hw(struct ieee80211_hw *hw)
1107 {
1108 struct ieee80211_local *local = hw_to_local(hw);
1109
1110 mutex_destroy(&local->iflist_mtx);
1111 mutex_destroy(&local->scan_mtx);
1112
1113 wiphy_free(local->hw.wiphy);
1114 }
1115 EXPORT_SYMBOL(ieee80211_free_hw);
1116
1117 static int __init ieee80211_init(void)
1118 {
1119 struct sk_buff *skb;
1120 int ret;
1121
1122 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1123 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1124 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1125
1126 ret = rc80211_minstrel_init();
1127 if (ret)
1128 return ret;
1129
1130 ret = rc80211_pid_init();
1131 if (ret)
1132 return ret;
1133
1134 ieee80211_debugfs_netdev_init();
1135
1136 return 0;
1137 }
1138
1139 static void __exit ieee80211_exit(void)
1140 {
1141 rc80211_pid_exit();
1142 rc80211_minstrel_exit();
1143
1144 /*
1145 * For key todo, it'll be empty by now but the work
1146 * might still be scheduled.
1147 */
1148 flush_scheduled_work();
1149
1150 if (mesh_allocated)
1151 ieee80211s_stop();
1152
1153 ieee80211_debugfs_netdev_exit();
1154 }
1155
1156
1157 subsys_initcall(ieee80211_init);
1158 module_exit(ieee80211_exit);
1159
1160 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1161 MODULE_LICENSE("GPL");
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