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mac80211: unify config_interface and bss_info_changed
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / main.c
blobc817c9ef215af5a2b137456e46ae8cf2bc0d21fa
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 "rate.h"
30 #include "mesh.h"
31 #include "wep.h"
32 #include "wme.h"
33 #include "aes_ccm.h"
34 #include "led.h"
35 #include "cfg.h"
36 #include "debugfs.h"
37 #include "debugfs_netdev.h"
38
39 /*
40 * For seeing transmitted packets on monitor interfaces
41 * we have a radiotap header too.
42 */
43 struct ieee80211_tx_status_rtap_hdr {
44 struct ieee80211_radiotap_header hdr;
45 u8 rate;
46 u8 padding_for_rate;
47 __le16 tx_flags;
48 u8 data_retries;
49 } __attribute__ ((packed));
50
51
52 /* must be called under mdev tx lock */
53 void ieee80211_configure_filter(struct ieee80211_local *local)
54 {
55 unsigned int changed_flags;
56 unsigned int new_flags = 0;
57
58 if (atomic_read(&local->iff_promiscs))
59 new_flags |= FIF_PROMISC_IN_BSS;
60
61 if (atomic_read(&local->iff_allmultis))
62 new_flags |= FIF_ALLMULTI;
63
64 if (local->monitors)
65 new_flags |= FIF_BCN_PRBRESP_PROMISC;
66
67 if (local->fif_fcsfail)
68 new_flags |= FIF_FCSFAIL;
69
70 if (local->fif_plcpfail)
71 new_flags |= FIF_PLCPFAIL;
72
73 if (local->fif_control)
74 new_flags |= FIF_CONTROL;
75
76 if (local->fif_other_bss)
77 new_flags |= FIF_OTHER_BSS;
78
79 changed_flags = local->filter_flags ^ new_flags;
80
81 /* be a bit nasty */
82 new_flags |= (1<<31);
83
84 local->ops->configure_filter(local_to_hw(local),
85 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 = local->ops->config(local_to_hw(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 if (local->ops->bss_info_changed)
280 local->ops->bss_info_changed(local_to_hw(local),
281 &sdata->vif,
282 &sdata->vif.bss_conf,
283 changed);
284
285 /*
286 * DEPRECATED
287 *
288 * ~changed is just there to not do this at resume time
289 */
290 if (changed & BSS_CHANGED_BEACON_INT && ~changed) {
291 local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int;
292 ieee80211_hw_config(local,
293 _IEEE80211_CONF_CHANGE_BEACON_INTERVAL);
294 }
295 }
296
297 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
298 {
299 sdata->vif.bss_conf.use_cts_prot = false;
300 sdata->vif.bss_conf.use_short_preamble = false;
301 sdata->vif.bss_conf.use_short_slot = false;
302 return BSS_CHANGED_ERP_CTS_PROT |
303 BSS_CHANGED_ERP_PREAMBLE |
304 BSS_CHANGED_ERP_SLOT;
305 }
306
307 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
308 struct sk_buff *skb)
309 {
310 struct ieee80211_local *local = hw_to_local(hw);
311 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
312 int tmp;
313
314 skb->dev = local->mdev;
315 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
316 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
317 &local->skb_queue : &local->skb_queue_unreliable, skb);
318 tmp = skb_queue_len(&local->skb_queue) +
319 skb_queue_len(&local->skb_queue_unreliable);
320 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
321 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
322 dev_kfree_skb_irq(skb);
323 tmp--;
324 I802_DEBUG_INC(local->tx_status_drop);
325 }
326 tasklet_schedule(&local->tasklet);
327 }
328 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
329
330 static void ieee80211_tasklet_handler(unsigned long data)
331 {
332 struct ieee80211_local *local = (struct ieee80211_local *) data;
333 struct sk_buff *skb;
334 struct ieee80211_rx_status rx_status;
335 struct ieee80211_ra_tid *ra_tid;
336
337 while ((skb = skb_dequeue(&local->skb_queue)) ||
338 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
339 switch (skb->pkt_type) {
340 case IEEE80211_RX_MSG:
341 /* status is in skb->cb */
342 memcpy(&rx_status, skb->cb, sizeof(rx_status));
343 /* Clear skb->pkt_type in order to not confuse kernel
344 * netstack. */
345 skb->pkt_type = 0;
346 __ieee80211_rx(local_to_hw(local), skb, &rx_status);
347 break;
348 case IEEE80211_TX_STATUS_MSG:
349 skb->pkt_type = 0;
350 ieee80211_tx_status(local_to_hw(local), skb);
351 break;
352 case IEEE80211_DELBA_MSG:
353 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
354 ieee80211_stop_tx_ba_cb(local_to_hw(local),
355 ra_tid->ra, ra_tid->tid);
356 dev_kfree_skb(skb);
357 break;
358 case IEEE80211_ADDBA_MSG:
359 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
360 ieee80211_start_tx_ba_cb(local_to_hw(local),
361 ra_tid->ra, ra_tid->tid);
362 dev_kfree_skb(skb);
363 break ;
364 default:
365 WARN(1, "mac80211: Packet is of unknown type %d\n",
366 skb->pkt_type);
367 dev_kfree_skb(skb);
368 break;
369 }
370 }
371 }
372
373 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
374 * make a prepared TX frame (one that has been given to hw) to look like brand
375 * new IEEE 802.11 frame that is ready to go through TX processing again.
376 */
377 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
378 struct ieee80211_key *key,
379 struct sk_buff *skb)
380 {
381 unsigned int hdrlen, iv_len, mic_len;
382 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
383
384 hdrlen = ieee80211_hdrlen(hdr->frame_control);
385
386 if (!key)
387 goto no_key;
388
389 switch (key->conf.alg) {
390 case ALG_WEP:
391 iv_len = WEP_IV_LEN;
392 mic_len = WEP_ICV_LEN;
393 break;
394 case ALG_TKIP:
395 iv_len = TKIP_IV_LEN;
396 mic_len = TKIP_ICV_LEN;
397 break;
398 case ALG_CCMP:
399 iv_len = CCMP_HDR_LEN;
400 mic_len = CCMP_MIC_LEN;
401 break;
402 default:
403 goto no_key;
404 }
405
406 if (skb->len >= hdrlen + mic_len &&
407 !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
408 skb_trim(skb, skb->len - mic_len);
409 if (skb->len >= hdrlen + iv_len) {
410 memmove(skb->data + iv_len, skb->data, hdrlen);
411 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
412 }
413
414 no_key:
415 if (ieee80211_is_data_qos(hdr->frame_control)) {
416 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
417 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
418 hdrlen - IEEE80211_QOS_CTL_LEN);
419 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
420 }
421 }
422
423 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
424 struct sta_info *sta,
425 struct sk_buff *skb)
426 {
427 sta->tx_filtered_count++;
428
429 /*
430 * Clear the TX filter mask for this STA when sending the next
431 * packet. If the STA went to power save mode, this will happen
432 * when it wakes up for the next time.
433 */
434 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
435
436 /*
437 * This code races in the following way:
438 *
439 * (1) STA sends frame indicating it will go to sleep and does so
440 * (2) hardware/firmware adds STA to filter list, passes frame up
441 * (3) hardware/firmware processes TX fifo and suppresses a frame
442 * (4) we get TX status before having processed the frame and
443 * knowing that the STA has gone to sleep.
444 *
445 * This is actually quite unlikely even when both those events are
446 * processed from interrupts coming in quickly after one another or
447 * even at the same time because we queue both TX status events and
448 * RX frames to be processed by a tasklet and process them in the
449 * same order that they were received or TX status last. Hence, there
450 * is no race as long as the frame RX is processed before the next TX
451 * status, which drivers can ensure, see below.
452 *
453 * Note that this can only happen if the hardware or firmware can
454 * actually add STAs to the filter list, if this is done by the
455 * driver in response to set_tim() (which will only reduce the race
456 * this whole filtering tries to solve, not completely solve it)
457 * this situation cannot happen.
458 *
459 * To completely solve this race drivers need to make sure that they
460 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
461 * functions and
462 * (b) always process RX events before TX status events if ordering
463 * can be unknown, for example with different interrupt status
464 * bits.
465 */
466 if (test_sta_flags(sta, WLAN_STA_PS) &&
467 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
468 ieee80211_remove_tx_extra(local, sta->key, skb);
469 skb_queue_tail(&sta->tx_filtered, skb);
470 return;
471 }
472
473 if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
474 /* Software retry the packet once */
475 skb->requeue = 1;
476 ieee80211_remove_tx_extra(local, sta->key, skb);
477 dev_queue_xmit(skb);
478 return;
479 }
480
481 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
482 if (net_ratelimit())
483 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
484 "queue_len=%d PS=%d @%lu\n",
485 wiphy_name(local->hw.wiphy),
486 skb_queue_len(&sta->tx_filtered),
487 !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
488 #endif
489 dev_kfree_skb(skb);
490 }
491
492 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
493 {
494 struct sk_buff *skb2;
495 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
496 struct ieee80211_local *local = hw_to_local(hw);
497 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
498 u16 frag, type;
499 __le16 fc;
500 struct ieee80211_supported_band *sband;
501 struct ieee80211_tx_status_rtap_hdr *rthdr;
502 struct ieee80211_sub_if_data *sdata;
503 struct net_device *prev_dev = NULL;
504 struct sta_info *sta;
505 int retry_count = -1, i;
506
507 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
508 /* the HW cannot have attempted that rate */
509 if (i >= hw->max_rates) {
510 info->status.rates[i].idx = -1;
511 info->status.rates[i].count = 0;
512 }
513
514 retry_count += info->status.rates[i].count;
515 }
516 if (retry_count < 0)
517 retry_count = 0;
518
519 rcu_read_lock();
520
521 sband = local->hw.wiphy->bands[info->band];
522
523 sta = sta_info_get(local, hdr->addr1);
524
525 if (sta) {
526 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
527 test_sta_flags(sta, WLAN_STA_PS)) {
528 /*
529 * The STA is in power save mode, so assume
530 * that this TX packet failed because of that.
531 */
532 ieee80211_handle_filtered_frame(local, sta, skb);
533 rcu_read_unlock();
534 return;
535 }
536
537 fc = hdr->frame_control;
538
539 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
540 (ieee80211_is_data_qos(fc))) {
541 u16 tid, ssn;
542 u8 *qc;
543
544 qc = ieee80211_get_qos_ctl(hdr);
545 tid = qc[0] & 0xf;
546 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
547 & IEEE80211_SCTL_SEQ);
548 ieee80211_send_bar(sta->sdata, hdr->addr1,
549 tid, ssn);
550 }
551
552 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
553 ieee80211_handle_filtered_frame(local, sta, skb);
554 rcu_read_unlock();
555 return;
556 } else {
557 if (!(info->flags & IEEE80211_TX_STAT_ACK))
558 sta->tx_retry_failed++;
559 sta->tx_retry_count += retry_count;
560 }
561
562 rate_control_tx_status(local, sband, sta, skb);
563 }
564
565 rcu_read_unlock();
566
567 ieee80211_led_tx(local, 0);
568
569 /* SNMP counters
570 * Fragments are passed to low-level drivers as separate skbs, so these
571 * are actually fragments, not frames. Update frame counters only for
572 * the first fragment of the frame. */
573
574 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
575 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
576
577 if (info->flags & IEEE80211_TX_STAT_ACK) {
578 if (frag == 0) {
579 local->dot11TransmittedFrameCount++;
580 if (is_multicast_ether_addr(hdr->addr1))
581 local->dot11MulticastTransmittedFrameCount++;
582 if (retry_count > 0)
583 local->dot11RetryCount++;
584 if (retry_count > 1)
585 local->dot11MultipleRetryCount++;
586 }
587
588 /* This counter shall be incremented for an acknowledged MPDU
589 * with an individual address in the address 1 field or an MPDU
590 * with a multicast address in the address 1 field of type Data
591 * or Management. */
592 if (!is_multicast_ether_addr(hdr->addr1) ||
593 type == IEEE80211_FTYPE_DATA ||
594 type == IEEE80211_FTYPE_MGMT)
595 local->dot11TransmittedFragmentCount++;
596 } else {
597 if (frag == 0)
598 local->dot11FailedCount++;
599 }
600
601 /* this was a transmitted frame, but now we want to reuse it */
602 skb_orphan(skb);
603
604 /*
605 * This is a bit racy but we can avoid a lot of work
606 * with this test...
607 */
608 if (!local->monitors && !local->cooked_mntrs) {
609 dev_kfree_skb(skb);
610 return;
611 }
612
613 /* send frame to monitor interfaces now */
614
615 if (skb_headroom(skb) < sizeof(*rthdr)) {
616 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
617 dev_kfree_skb(skb);
618 return;
619 }
620
621 rthdr = (struct ieee80211_tx_status_rtap_hdr *)
622 skb_push(skb, sizeof(*rthdr));
623
624 memset(rthdr, 0, sizeof(*rthdr));
625 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
626 rthdr->hdr.it_present =
627 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
628 (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
629 (1 << IEEE80211_RADIOTAP_RATE));
630
631 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
632 !is_multicast_ether_addr(hdr->addr1))
633 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
634
635 /*
636 * XXX: Once radiotap gets the bitmap reset thing the vendor
637 * extensions proposal contains, we can actually report
638 * the whole set of tries we did.
639 */
640 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
641 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
642 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
643 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
644 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
645 if (info->status.rates[0].idx >= 0 &&
646 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
647 rthdr->rate = sband->bitrates[
648 info->status.rates[0].idx].bitrate / 5;
649
650 /* for now report the total retry_count */
651 rthdr->data_retries = retry_count;
652
653 /* XXX: is this sufficient for BPF? */
654 skb_set_mac_header(skb, 0);
655 skb->ip_summed = CHECKSUM_UNNECESSARY;
656 skb->pkt_type = PACKET_OTHERHOST;
657 skb->protocol = htons(ETH_P_802_2);
658 memset(skb->cb, 0, sizeof(skb->cb));
659
660 rcu_read_lock();
661 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
662 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
663 if (!netif_running(sdata->dev))
664 continue;
665
666 if (prev_dev) {
667 skb2 = skb_clone(skb, GFP_ATOMIC);
668 if (skb2) {
669 skb2->dev = prev_dev;
670 netif_rx(skb2);
671 }
672 }
673
674 prev_dev = sdata->dev;
675 }
676 }
677 if (prev_dev) {
678 skb->dev = prev_dev;
679 netif_rx(skb);
680 skb = NULL;
681 }
682 rcu_read_unlock();
683 dev_kfree_skb(skb);
684 }
685 EXPORT_SYMBOL(ieee80211_tx_status);
686
687 static void ieee80211_restart_work(struct work_struct *work)
688 {
689 struct ieee80211_local *local =
690 container_of(work, struct ieee80211_local, restart_work);
691
692 rtnl_lock();
693 ieee80211_reconfig(local);
694 rtnl_unlock();
695 }
696
697 void ieee80211_restart_hw(struct ieee80211_hw *hw)
698 {
699 struct ieee80211_local *local = hw_to_local(hw);
700
701 /* use this reason, __ieee80211_resume will unblock it */
702 ieee80211_stop_queues_by_reason(hw,
703 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
704
705 schedule_work(&local->restart_work);
706 }
707 EXPORT_SYMBOL(ieee80211_restart_hw);
708
709 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
710 const struct ieee80211_ops *ops)
711 {
712 struct ieee80211_local *local;
713 int priv_size, i;
714 struct wiphy *wiphy;
715
716 /* Ensure 32-byte alignment of our private data and hw private data.
717 * We use the wiphy priv data for both our ieee80211_local and for
718 * the driver's private data
719 *
720 * In memory it'll be like this:
721 *
722 * +-------------------------+
723 * | struct wiphy |
724 * +-------------------------+
725 * | struct ieee80211_local |
726 * +-------------------------+
727 * | driver's private data |
728 * +-------------------------+
729 *
730 */
731 priv_size = ((sizeof(struct ieee80211_local) +
732 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
733 priv_data_len;
734
735 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
736
737 if (!wiphy)
738 return NULL;
739
740 wiphy->privid = mac80211_wiphy_privid;
741
742 /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
743 wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
744 sizeof(struct cfg80211_bss);
745
746 local = wiphy_priv(wiphy);
747
748 local->hw.wiphy = wiphy;
749
750 local->hw.priv = (char *)local +
751 ((sizeof(struct ieee80211_local) +
752 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
753
754 BUG_ON(!ops->tx);
755 BUG_ON(!ops->start);
756 BUG_ON(!ops->stop);
757 BUG_ON(!ops->config);
758 BUG_ON(!ops->add_interface);
759 BUG_ON(!ops->remove_interface);
760 BUG_ON(!ops->configure_filter);
761 local->ops = ops;
762
763 /* set up some defaults */
764 local->hw.queues = 1;
765 local->hw.max_rates = 1;
766 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
767 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
768 local->hw.conf.radio_enabled = true;
769 local->user_power_level = -1;
770
771 INIT_LIST_HEAD(&local->interfaces);
772 mutex_init(&local->iflist_mtx);
773 mutex_init(&local->scan_mtx);
774
775 spin_lock_init(&local->key_lock);
776
777 spin_lock_init(&local->queue_stop_reason_lock);
778
779 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
780
781 INIT_WORK(&local->restart_work, ieee80211_restart_work);
782
783 INIT_WORK(&local->dynamic_ps_enable_work,
784 ieee80211_dynamic_ps_enable_work);
785 INIT_WORK(&local->dynamic_ps_disable_work,
786 ieee80211_dynamic_ps_disable_work);
787 setup_timer(&local->dynamic_ps_timer,
788 ieee80211_dynamic_ps_timer, (unsigned long) local);
789
790 sta_info_init(local);
791
792 for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
793 skb_queue_head_init(&local->pending[i]);
794 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
795 (unsigned long)local);
796 tasklet_disable(&local->tx_pending_tasklet);
797
798 tasklet_init(&local->tasklet,
799 ieee80211_tasklet_handler,
800 (unsigned long) local);
801 tasklet_disable(&local->tasklet);
802
803 skb_queue_head_init(&local->skb_queue);
804 skb_queue_head_init(&local->skb_queue_unreliable);
805
806 spin_lock_init(&local->ampdu_lock);
807
808 return local_to_hw(local);
809 }
810 EXPORT_SYMBOL(ieee80211_alloc_hw);
811
812 static const struct net_device_ops ieee80211_master_ops = {
813 .ndo_start_xmit = ieee80211_master_start_xmit,
814 .ndo_open = ieee80211_master_open,
815 .ndo_stop = ieee80211_master_stop,
816 .ndo_set_multicast_list = ieee80211_master_set_multicast_list,
817 .ndo_select_queue = ieee80211_select_queue,
818 };
819
820 static void ieee80211_master_setup(struct net_device *mdev)
821 {
822 mdev->type = ARPHRD_IEEE80211;
823 mdev->netdev_ops = &ieee80211_master_ops;
824 mdev->header_ops = &ieee80211_header_ops;
825 mdev->tx_queue_len = 1000;
826 mdev->addr_len = ETH_ALEN;
827 }
828
829 int ieee80211_register_hw(struct ieee80211_hw *hw)
830 {
831 struct ieee80211_local *local = hw_to_local(hw);
832 int result;
833 enum ieee80211_band band;
834 struct net_device *mdev;
835 struct ieee80211_master_priv *mpriv;
836 int channels, i, j, max_bitrates;
837 bool supp_ht;
838 static const u32 cipher_suites[] = {
839 WLAN_CIPHER_SUITE_WEP40,
840 WLAN_CIPHER_SUITE_WEP104,
841 WLAN_CIPHER_SUITE_TKIP,
842 WLAN_CIPHER_SUITE_CCMP,
843
844 /* keep last -- depends on hw flags! */
845 WLAN_CIPHER_SUITE_AES_CMAC
846 };
847
848 /*
849 * generic code guarantees at least one band,
850 * set this very early because much code assumes
851 * that hw.conf.channel is assigned
852 */
853 channels = 0;
854 max_bitrates = 0;
855 supp_ht = false;
856 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
857 struct ieee80211_supported_band *sband;
858
859 sband = local->hw.wiphy->bands[band];
860 if (!sband)
861 continue;
862 if (!local->oper_channel) {
863 /* init channel we're on */
864 local->hw.conf.channel =
865 local->oper_channel =
866 local->scan_channel = &sband->channels[0];
867 }
868 channels += sband->n_channels;
869
870 if (max_bitrates < sband->n_bitrates)
871 max_bitrates = sband->n_bitrates;
872 supp_ht = supp_ht || sband->ht_cap.ht_supported;
873 }
874
875 local->int_scan_req.n_channels = channels;
876 local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
877 if (!local->int_scan_req.channels)
878 return -ENOMEM;
879
880 /* if low-level driver supports AP, we also support VLAN */
881 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
882 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
883
884 /* mac80211 always supports monitor */
885 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
886
887 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
888 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
889 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
890 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
891
892 /*
893 * Calculate scan IE length -- we need this to alloc
894 * memory and to subtract from the driver limit. It
895 * includes the (extended) supported rates and HT
896 * information -- SSID is the driver's responsibility.
897 */
898 local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
899 if (supp_ht)
900 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
901
902 if (!local->ops->hw_scan) {
903 /* For hw_scan, driver needs to set these up. */
904 local->hw.wiphy->max_scan_ssids = 4;
905 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
906 }
907
908 /*
909 * If the driver supports any scan IEs, then assume the
910 * limit includes the IEs mac80211 will add, otherwise
911 * leave it at zero and let the driver sort it out; we
912 * still pass our IEs to the driver but userspace will
913 * not be allowed to in that case.
914 */
915 if (local->hw.wiphy->max_scan_ie_len)
916 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
917
918 local->hw.wiphy->cipher_suites = cipher_suites;
919 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
920 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
921 local->hw.wiphy->n_cipher_suites--;
922
923 result = wiphy_register(local->hw.wiphy);
924 if (result < 0)
925 goto fail_wiphy_register;
926
927 /*
928 * We use the number of queues for feature tests (QoS, HT) internally
929 * so restrict them appropriately.
930 */
931 if (hw->queues > IEEE80211_MAX_QUEUES)
932 hw->queues = IEEE80211_MAX_QUEUES;
933
934 mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
935 "wmaster%d", ieee80211_master_setup,
936 hw->queues);
937 if (!mdev)
938 goto fail_mdev_alloc;
939
940 mpriv = netdev_priv(mdev);
941 mpriv->local = local;
942 local->mdev = mdev;
943
944 local->hw.workqueue =
945 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
946 if (!local->hw.workqueue) {
947 result = -ENOMEM;
948 goto fail_workqueue;
949 }
950
951 /*
952 * The hardware needs headroom for sending the frame,
953 * and we need some headroom for passing the frame to monitor
954 * interfaces, but never both at the same time.
955 */
956 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
957 sizeof(struct ieee80211_tx_status_rtap_hdr));
958
959 debugfs_hw_add(local);
960
961 if (local->hw.max_listen_interval == 0)
962 local->hw.max_listen_interval = 1;
963
964 local->hw.conf.listen_interval = local->hw.max_listen_interval;
965
966 result = sta_info_start(local);
967 if (result < 0)
968 goto fail_sta_info;
969
970 result = ieee80211_wep_init(local);
971 if (result < 0) {
972 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
973 wiphy_name(local->hw.wiphy), result);
974 goto fail_wep;
975 }
976
977 rtnl_lock();
978 result = dev_alloc_name(local->mdev, local->mdev->name);
979 if (result < 0)
980 goto fail_dev;
981
982 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
983 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
984 local->mdev->features |= NETIF_F_NETNS_LOCAL;
985
986 result = register_netdevice(local->mdev);
987 if (result < 0)
988 goto fail_dev;
989
990 result = ieee80211_init_rate_ctrl_alg(local,
991 hw->rate_control_algorithm);
992 if (result < 0) {
993 printk(KERN_DEBUG "%s: Failed to initialize rate control "
994 "algorithm\n", wiphy_name(local->hw.wiphy));
995 goto fail_rate;
996 }
997
998 /* add one default STA interface if supported */
999 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
1000 result = ieee80211_if_add(local, "wlan%d", NULL,
1001 NL80211_IFTYPE_STATION, NULL);
1002 if (result)
1003 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1004 wiphy_name(local->hw.wiphy));
1005 }
1006
1007 rtnl_unlock();
1008
1009 ieee80211_led_init(local);
1010
1011 /* alloc internal scan request */
1012 i = 0;
1013 local->int_scan_req.ssids = &local->scan_ssid;
1014 local->int_scan_req.n_ssids = 1;
1015 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1016 if (!hw->wiphy->bands[band])
1017 continue;
1018 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
1019 local->int_scan_req.channels[i] =
1020 &hw->wiphy->bands[band]->channels[j];
1021 i++;
1022 }
1023 }
1024
1025 local->network_latency_notifier.notifier_call =
1026 ieee80211_max_network_latency;
1027 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
1028 &local->network_latency_notifier);
1029
1030 if (result) {
1031 rtnl_lock();
1032 goto fail_pm_qos;
1033 }
1034
1035 return 0;
1036
1037 fail_pm_qos:
1038 ieee80211_led_exit(local);
1039 ieee80211_remove_interfaces(local);
1040 fail_rate:
1041 unregister_netdevice(local->mdev);
1042 local->mdev = NULL;
1043 fail_dev:
1044 rtnl_unlock();
1045 ieee80211_wep_free(local);
1046 fail_wep:
1047 sta_info_stop(local);
1048 fail_sta_info:
1049 debugfs_hw_del(local);
1050 destroy_workqueue(local->hw.workqueue);
1051 fail_workqueue:
1052 if (local->mdev)
1053 free_netdev(local->mdev);
1054 fail_mdev_alloc:
1055 wiphy_unregister(local->hw.wiphy);
1056 fail_wiphy_register:
1057 kfree(local->int_scan_req.channels);
1058 return result;
1059 }
1060 EXPORT_SYMBOL(ieee80211_register_hw);
1061
1062 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1063 {
1064 struct ieee80211_local *local = hw_to_local(hw);
1065
1066 tasklet_kill(&local->tx_pending_tasklet);
1067 tasklet_kill(&local->tasklet);
1068
1069 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1070 &local->network_latency_notifier);
1071
1072 rtnl_lock();
1073
1074 /*
1075 * At this point, interface list manipulations are fine
1076 * because the driver cannot be handing us frames any
1077 * more and the tasklet is killed.
1078 */
1079
1080 /* First, we remove all virtual interfaces. */
1081 ieee80211_remove_interfaces(local);
1082
1083 /* then, finally, remove the master interface */
1084 unregister_netdevice(local->mdev);
1085
1086 rtnl_unlock();
1087
1088 ieee80211_clear_tx_pending(local);
1089 sta_info_stop(local);
1090 rate_control_deinitialize(local);
1091 debugfs_hw_del(local);
1092
1093 if (skb_queue_len(&local->skb_queue)
1094 || skb_queue_len(&local->skb_queue_unreliable))
1095 printk(KERN_WARNING "%s: skb_queue not empty\n",
1096 wiphy_name(local->hw.wiphy));
1097 skb_queue_purge(&local->skb_queue);
1098 skb_queue_purge(&local->skb_queue_unreliable);
1099
1100 destroy_workqueue(local->hw.workqueue);
1101 wiphy_unregister(local->hw.wiphy);
1102 ieee80211_wep_free(local);
1103 ieee80211_led_exit(local);
1104 free_netdev(local->mdev);
1105 kfree(local->int_scan_req.channels);
1106 }
1107 EXPORT_SYMBOL(ieee80211_unregister_hw);
1108
1109 void ieee80211_free_hw(struct ieee80211_hw *hw)
1110 {
1111 struct ieee80211_local *local = hw_to_local(hw);
1112
1113 mutex_destroy(&local->iflist_mtx);
1114 mutex_destroy(&local->scan_mtx);
1115
1116 wiphy_free(local->hw.wiphy);
1117 }
1118 EXPORT_SYMBOL(ieee80211_free_hw);
1119
1120 static int __init ieee80211_init(void)
1121 {
1122 struct sk_buff *skb;
1123 int ret;
1124
1125 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1126 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1127 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1128
1129 ret = rc80211_minstrel_init();
1130 if (ret)
1131 return ret;
1132
1133 ret = rc80211_pid_init();
1134 if (ret)
1135 return ret;
1136
1137 ieee80211_debugfs_netdev_init();
1138
1139 return 0;
1140 }
1141
1142 static void __exit ieee80211_exit(void)
1143 {
1144 rc80211_pid_exit();
1145 rc80211_minstrel_exit();
1146
1147 /*
1148 * For key todo, it'll be empty by now but the work
1149 * might still be scheduled.
1150 */
1151 flush_scheduled_work();
1152
1153 if (mesh_allocated)
1154 ieee80211s_stop();
1155
1156 ieee80211_debugfs_netdev_exit();
1157 }
1158
1159
1160 subsys_initcall(ieee80211_init);
1161 module_exit(ieee80211_exit);
1162
1163 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1164 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree