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p54: integrate parts of lmac_longbow.h and other parts of stlc45xx
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / main.c
blob88c1975a97a52240d4cece35103f3dcdba8e2d4d
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 conf.ssid = sdata->u.sta.ssid;
177 conf.ssid_len = sdata->u.sta.ssid_len;
178 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
179 conf.bssid = sdata->dev->dev_addr;
180 conf.ssid = sdata->u.ap.ssid;
181 conf.ssid_len = sdata->u.ap.ssid_len;
182 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
183 u8 zero[ETH_ALEN] = { 0 };
184 conf.bssid = zero;
185 conf.ssid = zero;
186 conf.ssid_len = 0;
187 } else {
188 WARN_ON(1);
189 return -EINVAL;
190 }
191
192 if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
193 return -EINVAL;
194
195 if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID)))
196 return -EINVAL;
197
198 return local->ops->config_interface(local_to_hw(local),
199 &sdata->vif, &conf);
200 }
201
202 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
203 {
204 struct ieee80211_channel *chan;
205 int ret = 0;
206 int power;
207
208 might_sleep();
209
210 if (local->sw_scanning)
211 chan = local->scan_channel;
212 else
213 chan = local->oper_channel;
214
215 if (chan != local->hw.conf.channel) {
216 local->hw.conf.channel = chan;
217 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
218 }
219
220
221 if (!local->hw.conf.power_level)
222 power = chan->max_power;
223 else
224 power = min(chan->max_power, local->hw.conf.power_level);
225 if (local->hw.conf.power_level != power) {
226 changed |= IEEE80211_CONF_CHANGE_POWER;
227 local->hw.conf.power_level = power;
228 }
229
230 if (changed && local->open_count) {
231 ret = local->ops->config(local_to_hw(local), changed);
232 /*
233 * HW reconfiguration should never fail, the driver has told
234 * us what it can support so it should live up to that promise.
235 */
236 WARN_ON(ret);
237 }
238
239 return ret;
240 }
241
242 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
243 u32 changed)
244 {
245 struct ieee80211_local *local = sdata->local;
246
247 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
248 return;
249
250 if (!changed)
251 return;
252
253 if (local->ops->bss_info_changed)
254 local->ops->bss_info_changed(local_to_hw(local),
255 &sdata->vif,
256 &sdata->vif.bss_conf,
257 changed);
258 }
259
260 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
261 {
262 sdata->vif.bss_conf.use_cts_prot = false;
263 sdata->vif.bss_conf.use_short_preamble = false;
264 sdata->vif.bss_conf.use_short_slot = false;
265 return BSS_CHANGED_ERP_CTS_PROT |
266 BSS_CHANGED_ERP_PREAMBLE |
267 BSS_CHANGED_ERP_SLOT;
268 }
269
270 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
271 struct sk_buff *skb)
272 {
273 struct ieee80211_local *local = hw_to_local(hw);
274 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
275 int tmp;
276
277 skb->dev = local->mdev;
278 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
279 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
280 &local->skb_queue : &local->skb_queue_unreliable, skb);
281 tmp = skb_queue_len(&local->skb_queue) +
282 skb_queue_len(&local->skb_queue_unreliable);
283 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
284 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
285 dev_kfree_skb_irq(skb);
286 tmp--;
287 I802_DEBUG_INC(local->tx_status_drop);
288 }
289 tasklet_schedule(&local->tasklet);
290 }
291 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
292
293 static void ieee80211_tasklet_handler(unsigned long data)
294 {
295 struct ieee80211_local *local = (struct ieee80211_local *) data;
296 struct sk_buff *skb;
297 struct ieee80211_rx_status rx_status;
298 struct ieee80211_ra_tid *ra_tid;
299
300 while ((skb = skb_dequeue(&local->skb_queue)) ||
301 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
302 switch (skb->pkt_type) {
303 case IEEE80211_RX_MSG:
304 /* status is in skb->cb */
305 memcpy(&rx_status, skb->cb, sizeof(rx_status));
306 /* Clear skb->pkt_type in order to not confuse kernel
307 * netstack. */
308 skb->pkt_type = 0;
309 __ieee80211_rx(local_to_hw(local), skb, &rx_status);
310 break;
311 case IEEE80211_TX_STATUS_MSG:
312 skb->pkt_type = 0;
313 ieee80211_tx_status(local_to_hw(local), skb);
314 break;
315 case IEEE80211_DELBA_MSG:
316 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
317 ieee80211_stop_tx_ba_cb(local_to_hw(local),
318 ra_tid->ra, ra_tid->tid);
319 dev_kfree_skb(skb);
320 break;
321 case IEEE80211_ADDBA_MSG:
322 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
323 ieee80211_start_tx_ba_cb(local_to_hw(local),
324 ra_tid->ra, ra_tid->tid);
325 dev_kfree_skb(skb);
326 break ;
327 default:
328 WARN_ON(1);
329 dev_kfree_skb(skb);
330 break;
331 }
332 }
333 }
334
335 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
336 * make a prepared TX frame (one that has been given to hw) to look like brand
337 * new IEEE 802.11 frame that is ready to go through TX processing again.
338 */
339 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
340 struct ieee80211_key *key,
341 struct sk_buff *skb)
342 {
343 unsigned int hdrlen, iv_len, mic_len;
344 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
345
346 hdrlen = ieee80211_hdrlen(hdr->frame_control);
347
348 if (!key)
349 goto no_key;
350
351 switch (key->conf.alg) {
352 case ALG_WEP:
353 iv_len = WEP_IV_LEN;
354 mic_len = WEP_ICV_LEN;
355 break;
356 case ALG_TKIP:
357 iv_len = TKIP_IV_LEN;
358 mic_len = TKIP_ICV_LEN;
359 break;
360 case ALG_CCMP:
361 iv_len = CCMP_HDR_LEN;
362 mic_len = CCMP_MIC_LEN;
363 break;
364 default:
365 goto no_key;
366 }
367
368 if (skb->len >= hdrlen + mic_len &&
369 !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
370 skb_trim(skb, skb->len - mic_len);
371 if (skb->len >= hdrlen + iv_len) {
372 memmove(skb->data + iv_len, skb->data, hdrlen);
373 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
374 }
375
376 no_key:
377 if (ieee80211_is_data_qos(hdr->frame_control)) {
378 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
379 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
380 hdrlen - IEEE80211_QOS_CTL_LEN);
381 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
382 }
383 }
384
385 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
386 struct sta_info *sta,
387 struct sk_buff *skb)
388 {
389 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
390
391 sta->tx_filtered_count++;
392
393 /*
394 * Clear the TX filter mask for this STA when sending the next
395 * packet. If the STA went to power save mode, this will happen
396 * when it wakes up for the next time.
397 */
398 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
399
400 /*
401 * This code races in the following way:
402 *
403 * (1) STA sends frame indicating it will go to sleep and does so
404 * (2) hardware/firmware adds STA to filter list, passes frame up
405 * (3) hardware/firmware processes TX fifo and suppresses a frame
406 * (4) we get TX status before having processed the frame and
407 * knowing that the STA has gone to sleep.
408 *
409 * This is actually quite unlikely even when both those events are
410 * processed from interrupts coming in quickly after one another or
411 * even at the same time because we queue both TX status events and
412 * RX frames to be processed by a tasklet and process them in the
413 * same order that they were received or TX status last. Hence, there
414 * is no race as long as the frame RX is processed before the next TX
415 * status, which drivers can ensure, see below.
416 *
417 * Note that this can only happen if the hardware or firmware can
418 * actually add STAs to the filter list, if this is done by the
419 * driver in response to set_tim() (which will only reduce the race
420 * this whole filtering tries to solve, not completely solve it)
421 * this situation cannot happen.
422 *
423 * To completely solve this race drivers need to make sure that they
424 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
425 * functions and
426 * (b) always process RX events before TX status events if ordering
427 * can be unknown, for example with different interrupt status
428 * bits.
429 */
430 if (test_sta_flags(sta, WLAN_STA_PS) &&
431 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
432 ieee80211_remove_tx_extra(local, sta->key, skb);
433 skb_queue_tail(&sta->tx_filtered, skb);
434 return;
435 }
436
437 if (!test_sta_flags(sta, WLAN_STA_PS) &&
438 !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
439 /* Software retry the packet once */
440 info->flags |= IEEE80211_TX_CTL_REQUEUE;
441 ieee80211_remove_tx_extra(local, sta->key, skb);
442 dev_queue_xmit(skb);
443 return;
444 }
445
446 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
447 if (net_ratelimit())
448 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
449 "queue_len=%d PS=%d @%lu\n",
450 wiphy_name(local->hw.wiphy),
451 skb_queue_len(&sta->tx_filtered),
452 !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
453 #endif
454 dev_kfree_skb(skb);
455 }
456
457 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
458 {
459 struct sk_buff *skb2;
460 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
461 struct ieee80211_local *local = hw_to_local(hw);
462 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
463 u16 frag, type;
464 __le16 fc;
465 struct ieee80211_supported_band *sband;
466 struct ieee80211_tx_status_rtap_hdr *rthdr;
467 struct ieee80211_sub_if_data *sdata;
468 struct net_device *prev_dev = NULL;
469 struct sta_info *sta;
470 int retry_count = -1, i;
471
472 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
473 /* the HW cannot have attempted that rate */
474 if (i >= hw->max_rates) {
475 info->status.rates[i].idx = -1;
476 info->status.rates[i].count = 0;
477 }
478
479 retry_count += info->status.rates[i].count;
480 }
481 if (retry_count < 0)
482 retry_count = 0;
483
484 rcu_read_lock();
485
486 sband = local->hw.wiphy->bands[info->band];
487
488 sta = sta_info_get(local, hdr->addr1);
489
490 if (sta) {
491 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
492 test_sta_flags(sta, WLAN_STA_PS)) {
493 /*
494 * The STA is in power save mode, so assume
495 * that this TX packet failed because of that.
496 */
497 ieee80211_handle_filtered_frame(local, sta, skb);
498 rcu_read_unlock();
499 return;
500 }
501
502 fc = hdr->frame_control;
503
504 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
505 (ieee80211_is_data_qos(fc))) {
506 u16 tid, ssn;
507 u8 *qc;
508
509 qc = ieee80211_get_qos_ctl(hdr);
510 tid = qc[0] & 0xf;
511 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
512 & IEEE80211_SCTL_SEQ);
513 ieee80211_send_bar(sta->sdata, hdr->addr1,
514 tid, ssn);
515 }
516
517 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
518 ieee80211_handle_filtered_frame(local, sta, skb);
519 rcu_read_unlock();
520 return;
521 } else {
522 if (!(info->flags & IEEE80211_TX_STAT_ACK))
523 sta->tx_retry_failed++;
524 sta->tx_retry_count += retry_count;
525 }
526
527 rate_control_tx_status(local, sband, sta, skb);
528 }
529
530 rcu_read_unlock();
531
532 ieee80211_led_tx(local, 0);
533
534 /* SNMP counters
535 * Fragments are passed to low-level drivers as separate skbs, so these
536 * are actually fragments, not frames. Update frame counters only for
537 * the first fragment of the frame. */
538
539 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
540 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
541
542 if (info->flags & IEEE80211_TX_STAT_ACK) {
543 if (frag == 0) {
544 local->dot11TransmittedFrameCount++;
545 if (is_multicast_ether_addr(hdr->addr1))
546 local->dot11MulticastTransmittedFrameCount++;
547 if (retry_count > 0)
548 local->dot11RetryCount++;
549 if (retry_count > 1)
550 local->dot11MultipleRetryCount++;
551 }
552
553 /* This counter shall be incremented for an acknowledged MPDU
554 * with an individual address in the address 1 field or an MPDU
555 * with a multicast address in the address 1 field of type Data
556 * or Management. */
557 if (!is_multicast_ether_addr(hdr->addr1) ||
558 type == IEEE80211_FTYPE_DATA ||
559 type == IEEE80211_FTYPE_MGMT)
560 local->dot11TransmittedFragmentCount++;
561 } else {
562 if (frag == 0)
563 local->dot11FailedCount++;
564 }
565
566 /* this was a transmitted frame, but now we want to reuse it */
567 skb_orphan(skb);
568
569 /*
570 * This is a bit racy but we can avoid a lot of work
571 * with this test...
572 */
573 if (!local->monitors && !local->cooked_mntrs) {
574 dev_kfree_skb(skb);
575 return;
576 }
577
578 /* send frame to monitor interfaces now */
579
580 if (skb_headroom(skb) < sizeof(*rthdr)) {
581 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
582 dev_kfree_skb(skb);
583 return;
584 }
585
586 rthdr = (struct ieee80211_tx_status_rtap_hdr *)
587 skb_push(skb, sizeof(*rthdr));
588
589 memset(rthdr, 0, sizeof(*rthdr));
590 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
591 rthdr->hdr.it_present =
592 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
593 (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
594 (1 << IEEE80211_RADIOTAP_RATE));
595
596 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
597 !is_multicast_ether_addr(hdr->addr1))
598 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
599
600 /*
601 * XXX: Once radiotap gets the bitmap reset thing the vendor
602 * extensions proposal contains, we can actually report
603 * the whole set of tries we did.
604 */
605 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
606 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
607 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
608 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
609 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
610 if (info->status.rates[0].idx >= 0 &&
611 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
612 rthdr->rate = sband->bitrates[
613 info->status.rates[0].idx].bitrate / 5;
614
615 /* for now report the total retry_count */
616 rthdr->data_retries = retry_count;
617
618 /* XXX: is this sufficient for BPF? */
619 skb_set_mac_header(skb, 0);
620 skb->ip_summed = CHECKSUM_UNNECESSARY;
621 skb->pkt_type = PACKET_OTHERHOST;
622 skb->protocol = htons(ETH_P_802_2);
623 memset(skb->cb, 0, sizeof(skb->cb));
624
625 rcu_read_lock();
626 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
627 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
628 if (!netif_running(sdata->dev))
629 continue;
630
631 if (prev_dev) {
632 skb2 = skb_clone(skb, GFP_ATOMIC);
633 if (skb2) {
634 skb2->dev = prev_dev;
635 netif_rx(skb2);
636 }
637 }
638
639 prev_dev = sdata->dev;
640 }
641 }
642 if (prev_dev) {
643 skb->dev = prev_dev;
644 netif_rx(skb);
645 skb = NULL;
646 }
647 rcu_read_unlock();
648 dev_kfree_skb(skb);
649 }
650 EXPORT_SYMBOL(ieee80211_tx_status);
651
652 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
653 const struct ieee80211_ops *ops)
654 {
655 struct ieee80211_local *local;
656 int priv_size;
657 struct wiphy *wiphy;
658
659 /* Ensure 32-byte alignment of our private data and hw private data.
660 * We use the wiphy priv data for both our ieee80211_local and for
661 * the driver's private data
662 *
663 * In memory it'll be like this:
664 *
665 * +-------------------------+
666 * | struct wiphy |
667 * +-------------------------+
668 * | struct ieee80211_local |
669 * +-------------------------+
670 * | driver's private data |
671 * +-------------------------+
672 *
673 */
674 priv_size = ((sizeof(struct ieee80211_local) +
675 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
676 priv_data_len;
677
678 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
679
680 if (!wiphy)
681 return NULL;
682
683 wiphy->privid = mac80211_wiphy_privid;
684
685 local = wiphy_priv(wiphy);
686 local->hw.wiphy = wiphy;
687
688 local->hw.priv = (char *)local +
689 ((sizeof(struct ieee80211_local) +
690 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
691
692 BUG_ON(!ops->tx);
693 BUG_ON(!ops->start);
694 BUG_ON(!ops->stop);
695 BUG_ON(!ops->config);
696 BUG_ON(!ops->add_interface);
697 BUG_ON(!ops->remove_interface);
698 BUG_ON(!ops->configure_filter);
699 local->ops = ops;
700
701 /* set up some defaults */
702 local->hw.queues = 1;
703 local->hw.max_rates = 1;
704 local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
705 local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
706 local->hw.conf.long_frame_max_tx_count = 4;
707 local->hw.conf.short_frame_max_tx_count = 7;
708 local->hw.conf.radio_enabled = true;
709
710 INIT_LIST_HEAD(&local->interfaces);
711
712 spin_lock_init(&local->key_lock);
713
714 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
715
716 sta_info_init(local);
717
718 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
719 (unsigned long)local);
720 tasklet_disable(&local->tx_pending_tasklet);
721
722 tasklet_init(&local->tasklet,
723 ieee80211_tasklet_handler,
724 (unsigned long) local);
725 tasklet_disable(&local->tasklet);
726
727 skb_queue_head_init(&local->skb_queue);
728 skb_queue_head_init(&local->skb_queue_unreliable);
729
730 return local_to_hw(local);
731 }
732 EXPORT_SYMBOL(ieee80211_alloc_hw);
733
734 int ieee80211_register_hw(struct ieee80211_hw *hw)
735 {
736 struct ieee80211_local *local = hw_to_local(hw);
737 const char *name;
738 int result;
739 enum ieee80211_band band;
740 struct net_device *mdev;
741 struct ieee80211_master_priv *mpriv;
742
743 /*
744 * generic code guarantees at least one band,
745 * set this very early because much code assumes
746 * that hw.conf.channel is assigned
747 */
748 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
749 struct ieee80211_supported_band *sband;
750
751 sband = local->hw.wiphy->bands[band];
752 if (sband) {
753 /* init channel we're on */
754 local->hw.conf.channel =
755 local->oper_channel =
756 local->scan_channel = &sband->channels[0];
757 break;
758 }
759 }
760
761 /* if low-level driver supports AP, we also support VLAN */
762 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
763 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
764
765 /* mac80211 always supports monitor */
766 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
767
768 result = wiphy_register(local->hw.wiphy);
769 if (result < 0)
770 return result;
771
772 /*
773 * We use the number of queues for feature tests (QoS, HT) internally
774 * so restrict them appropriately.
775 */
776 if (hw->queues > IEEE80211_MAX_QUEUES)
777 hw->queues = IEEE80211_MAX_QUEUES;
778 if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
779 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
780 if (hw->queues < 4)
781 hw->ampdu_queues = 0;
782
783 mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
784 "wmaster%d", ether_setup,
785 ieee80211_num_queues(hw));
786 if (!mdev)
787 goto fail_mdev_alloc;
788
789 mpriv = netdev_priv(mdev);
790 mpriv->local = local;
791 local->mdev = mdev;
792
793 ieee80211_rx_bss_list_init(local);
794
795 mdev->hard_start_xmit = ieee80211_master_start_xmit;
796 mdev->open = ieee80211_master_open;
797 mdev->stop = ieee80211_master_stop;
798 mdev->type = ARPHRD_IEEE80211;
799 mdev->header_ops = &ieee80211_header_ops;
800 mdev->set_multicast_list = ieee80211_master_set_multicast_list;
801
802 name = wiphy_dev(local->hw.wiphy)->driver->name;
803 local->hw.workqueue = create_freezeable_workqueue(name);
804 if (!local->hw.workqueue) {
805 result = -ENOMEM;
806 goto fail_workqueue;
807 }
808
809 /*
810 * The hardware needs headroom for sending the frame,
811 * and we need some headroom for passing the frame to monitor
812 * interfaces, but never both at the same time.
813 */
814 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
815 sizeof(struct ieee80211_tx_status_rtap_hdr));
816
817 debugfs_hw_add(local);
818
819 if (local->hw.conf.beacon_int < 10)
820 local->hw.conf.beacon_int = 100;
821
822 if (local->hw.max_listen_interval == 0)
823 local->hw.max_listen_interval = 1;
824
825 local->hw.conf.listen_interval = local->hw.max_listen_interval;
826
827 local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
828 IEEE80211_HW_SIGNAL_DB |
829 IEEE80211_HW_SIGNAL_DBM) ?
830 IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
831 local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
832 IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
833 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
834 local->wstats_flags |= IW_QUAL_DBM;
835
836 result = sta_info_start(local);
837 if (result < 0)
838 goto fail_sta_info;
839
840 rtnl_lock();
841 result = dev_alloc_name(local->mdev, local->mdev->name);
842 if (result < 0)
843 goto fail_dev;
844
845 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
846 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
847
848 result = register_netdevice(local->mdev);
849 if (result < 0)
850 goto fail_dev;
851
852 result = ieee80211_init_rate_ctrl_alg(local,
853 hw->rate_control_algorithm);
854 if (result < 0) {
855 printk(KERN_DEBUG "%s: Failed to initialize rate control "
856 "algorithm\n", wiphy_name(local->hw.wiphy));
857 goto fail_rate;
858 }
859
860 result = ieee80211_wep_init(local);
861
862 if (result < 0) {
863 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
864 wiphy_name(local->hw.wiphy), result);
865 goto fail_wep;
866 }
867
868 local->mdev->select_queue = ieee80211_select_queue;
869
870 /* add one default STA interface */
871 result = ieee80211_if_add(local, "wlan%d", NULL,
872 NL80211_IFTYPE_STATION, NULL);
873 if (result)
874 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
875 wiphy_name(local->hw.wiphy));
876
877 rtnl_unlock();
878
879 ieee80211_led_init(local);
880
881 return 0;
882
883 fail_wep:
884 rate_control_deinitialize(local);
885 fail_rate:
886 unregister_netdevice(local->mdev);
887 local->mdev = NULL;
888 fail_dev:
889 rtnl_unlock();
890 sta_info_stop(local);
891 fail_sta_info:
892 debugfs_hw_del(local);
893 destroy_workqueue(local->hw.workqueue);
894 fail_workqueue:
895 if (local->mdev)
896 free_netdev(local->mdev);
897 fail_mdev_alloc:
898 wiphy_unregister(local->hw.wiphy);
899 return result;
900 }
901 EXPORT_SYMBOL(ieee80211_register_hw);
902
903 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
904 {
905 struct ieee80211_local *local = hw_to_local(hw);
906
907 tasklet_kill(&local->tx_pending_tasklet);
908 tasklet_kill(&local->tasklet);
909
910 rtnl_lock();
911
912 /*
913 * At this point, interface list manipulations are fine
914 * because the driver cannot be handing us frames any
915 * more and the tasklet is killed.
916 */
917
918 /* First, we remove all virtual interfaces. */
919 ieee80211_remove_interfaces(local);
920
921 /* then, finally, remove the master interface */
922 unregister_netdevice(local->mdev);
923
924 rtnl_unlock();
925
926 ieee80211_rx_bss_list_deinit(local);
927 ieee80211_clear_tx_pending(local);
928 sta_info_stop(local);
929 rate_control_deinitialize(local);
930 debugfs_hw_del(local);
931
932 if (skb_queue_len(&local->skb_queue)
933 || skb_queue_len(&local->skb_queue_unreliable))
934 printk(KERN_WARNING "%s: skb_queue not empty\n",
935 wiphy_name(local->hw.wiphy));
936 skb_queue_purge(&local->skb_queue);
937 skb_queue_purge(&local->skb_queue_unreliable);
938
939 destroy_workqueue(local->hw.workqueue);
940 wiphy_unregister(local->hw.wiphy);
941 ieee80211_wep_free(local);
942 ieee80211_led_exit(local);
943 free_netdev(local->mdev);
944 }
945 EXPORT_SYMBOL(ieee80211_unregister_hw);
946
947 void ieee80211_free_hw(struct ieee80211_hw *hw)
948 {
949 struct ieee80211_local *local = hw_to_local(hw);
950
951 wiphy_free(local->hw.wiphy);
952 }
953 EXPORT_SYMBOL(ieee80211_free_hw);
954
955 static int __init ieee80211_init(void)
956 {
957 struct sk_buff *skb;
958 int ret;
959
960 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
961 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
962 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
963
964 ret = rc80211_minstrel_init();
965 if (ret)
966 return ret;
967
968 ret = rc80211_pid_init();
969 if (ret)
970 return ret;
971
972 ieee80211_debugfs_netdev_init();
973
974 return 0;
975 }
976
977 static void __exit ieee80211_exit(void)
978 {
979 rc80211_pid_exit();
980 rc80211_minstrel_exit();
981
982 /*
983 * For key todo, it'll be empty by now but the work
984 * might still be scheduled.
985 */
986 flush_scheduled_work();
987
988 if (mesh_allocated)
989 ieee80211s_stop();
990
991 ieee80211_debugfs_netdev_exit();
992 }
993
994
995 subsys_initcall(ieee80211_init);
996 module_exit(ieee80211_exit);
997
998 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
999 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree