?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
mac80211: support remain-on-channel command
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / work.c
blob0acea7cf714a6a62b50a8366f0ba888edfb510c6
1 /*
2 * mac80211 work implementation
3 *
4 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
5 * Copyright 2004, Instant802 Networks, Inc.
6 * Copyright 2005, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
9 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16 #include <linux/delay.h>
17 #include <linux/if_ether.h>
18 #include <linux/skbuff.h>
19 #include <linux/if_arp.h>
20 #include <linux/etherdevice.h>
21 #include <linux/crc32.h>
22 #include <net/mac80211.h>
23 #include <asm/unaligned.h>
24
25 #include "ieee80211_i.h"
26 #include "rate.h"
27
28 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
29 #define IEEE80211_AUTH_MAX_TRIES 3
30 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
31 #define IEEE80211_ASSOC_MAX_TRIES 3
32 #define IEEE80211_MAX_PROBE_TRIES 5
33
34 enum work_action {
35 WORK_ACT_NONE,
36 WORK_ACT_TIMEOUT,
37 WORK_ACT_DONE,
38 };
39
40
41 /* utils */
42 static inline void ASSERT_WORK_MTX(struct ieee80211_local *local)
43 {
44 WARN_ON(!mutex_is_locked(&local->work_mtx));
45 }
46
47 /*
48 * We can have multiple work items (and connection probing)
49 * scheduling this timer, but we need to take care to only
50 * reschedule it when it should fire _earlier_ than it was
51 * asked for before, or if it's not pending right now. This
52 * function ensures that. Note that it then is required to
53 * run this function for all timeouts after the first one
54 * has happened -- the work that runs from this timer will
55 * do that.
56 */
57 static void run_again(struct ieee80211_local *local,
58 unsigned long timeout)
59 {
60 ASSERT_WORK_MTX(local);
61
62 if (!timer_pending(&local->work_timer) ||
63 time_before(timeout, local->work_timer.expires))
64 mod_timer(&local->work_timer, timeout);
65 }
66
67 static void work_free_rcu(struct rcu_head *head)
68 {
69 struct ieee80211_work *wk =
70 container_of(head, struct ieee80211_work, rcu_head);
71
72 kfree(wk);
73 }
74
75 void free_work(struct ieee80211_work *wk)
76 {
77 call_rcu(&wk->rcu_head, work_free_rcu);
78 }
79
80 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
81 struct ieee80211_supported_band *sband,
82 u32 *rates)
83 {
84 int i, j, count;
85 *rates = 0;
86 count = 0;
87 for (i = 0; i < supp_rates_len; i++) {
88 int rate = (supp_rates[i] & 0x7F) * 5;
89
90 for (j = 0; j < sband->n_bitrates; j++)
91 if (sband->bitrates[j].bitrate == rate) {
92 *rates |= BIT(j);
93 count++;
94 break;
95 }
96 }
97
98 return count;
99 }
100
101 /* frame sending functions */
102
103 static void ieee80211_add_ht_ie(struct sk_buff *skb, const u8 *ht_info_ie,
104 struct ieee80211_supported_band *sband,
105 struct ieee80211_channel *channel,
106 enum ieee80211_smps_mode smps)
107 {
108 struct ieee80211_ht_info *ht_info;
109 u8 *pos;
110 u32 flags = channel->flags;
111 u16 cap = sband->ht_cap.cap;
112 __le16 tmp;
113
114 if (!sband->ht_cap.ht_supported)
115 return;
116
117 if (!ht_info_ie)
118 return;
119
120 if (ht_info_ie[1] < sizeof(struct ieee80211_ht_info))
121 return;
122
123 ht_info = (struct ieee80211_ht_info *)(ht_info_ie + 2);
124
125 /* determine capability flags */
126
127 if (ieee80211_disable_40mhz_24ghz &&
128 sband->band == IEEE80211_BAND_2GHZ) {
129 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
130 cap &= ~IEEE80211_HT_CAP_SGI_40;
131 }
132
133 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
134 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
135 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
136 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
137 cap &= ~IEEE80211_HT_CAP_SGI_40;
138 }
139 break;
140 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
141 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
142 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
143 cap &= ~IEEE80211_HT_CAP_SGI_40;
144 }
145 break;
146 }
147
148 /* set SM PS mode properly */
149 cap &= ~IEEE80211_HT_CAP_SM_PS;
150 switch (smps) {
151 case IEEE80211_SMPS_AUTOMATIC:
152 case IEEE80211_SMPS_NUM_MODES:
153 WARN_ON(1);
154 case IEEE80211_SMPS_OFF:
155 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
156 IEEE80211_HT_CAP_SM_PS_SHIFT;
157 break;
158 case IEEE80211_SMPS_STATIC:
159 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
160 IEEE80211_HT_CAP_SM_PS_SHIFT;
161 break;
162 case IEEE80211_SMPS_DYNAMIC:
163 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
164 IEEE80211_HT_CAP_SM_PS_SHIFT;
165 break;
166 }
167
168 /* reserve and fill IE */
169
170 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
171 *pos++ = WLAN_EID_HT_CAPABILITY;
172 *pos++ = sizeof(struct ieee80211_ht_cap);
173 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
174
175 /* capability flags */
176 tmp = cpu_to_le16(cap);
177 memcpy(pos, &tmp, sizeof(u16));
178 pos += sizeof(u16);
179
180 /* AMPDU parameters */
181 *pos++ = sband->ht_cap.ampdu_factor |
182 (sband->ht_cap.ampdu_density <<
183 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
184
185 /* MCS set */
186 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
187 pos += sizeof(sband->ht_cap.mcs);
188
189 /* extended capabilities */
190 pos += sizeof(__le16);
191
192 /* BF capabilities */
193 pos += sizeof(__le32);
194
195 /* antenna selection */
196 pos += sizeof(u8);
197 }
198
199 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
200 struct ieee80211_work *wk)
201 {
202 struct ieee80211_local *local = sdata->local;
203 struct sk_buff *skb;
204 struct ieee80211_mgmt *mgmt;
205 u8 *pos;
206 const u8 *ies;
207 size_t offset = 0, noffset;
208 int i, len, count, rates_len, supp_rates_len;
209 u16 capab;
210 struct ieee80211_supported_band *sband;
211 u32 rates = 0;
212
213 sband = local->hw.wiphy->bands[wk->chan->band];
214
215 /*
216 * Get all rates supported by the device and the AP as
217 * some APs don't like getting a superset of their rates
218 * in the association request (e.g. D-Link DAP 1353 in
219 * b-only mode)...
220 */
221 rates_len = ieee80211_compatible_rates(wk->assoc.supp_rates,
222 wk->assoc.supp_rates_len,
223 sband, &rates);
224
225 skb = alloc_skb(local->hw.extra_tx_headroom +
226 sizeof(*mgmt) + /* bit too much but doesn't matter */
227 2 + wk->assoc.ssid_len + /* SSID */
228 4 + rates_len + /* (extended) rates */
229 4 + /* power capability */
230 2 + 2 * sband->n_channels + /* supported channels */
231 2 + sizeof(struct ieee80211_ht_cap) + /* HT */
232 wk->ie_len + /* extra IEs */
233 9, /* WMM */
234 GFP_KERNEL);
235 if (!skb) {
236 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
237 "frame\n", sdata->name);
238 return;
239 }
240 skb_reserve(skb, local->hw.extra_tx_headroom);
241
242 capab = WLAN_CAPABILITY_ESS;
243
244 if (sband->band == IEEE80211_BAND_2GHZ) {
245 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
246 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
247 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
248 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
249 }
250
251 if (wk->assoc.capability & WLAN_CAPABILITY_PRIVACY)
252 capab |= WLAN_CAPABILITY_PRIVACY;
253
254 if ((wk->assoc.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
255 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
256 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
257
258 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
259 memset(mgmt, 0, 24);
260 memcpy(mgmt->da, wk->filter_ta, ETH_ALEN);
261 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
262 memcpy(mgmt->bssid, wk->filter_ta, ETH_ALEN);
263
264 if (!is_zero_ether_addr(wk->assoc.prev_bssid)) {
265 skb_put(skb, 10);
266 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
267 IEEE80211_STYPE_REASSOC_REQ);
268 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
269 mgmt->u.reassoc_req.listen_interval =
270 cpu_to_le16(local->hw.conf.listen_interval);
271 memcpy(mgmt->u.reassoc_req.current_ap, wk->assoc.prev_bssid,
272 ETH_ALEN);
273 } else {
274 skb_put(skb, 4);
275 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
276 IEEE80211_STYPE_ASSOC_REQ);
277 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
278 mgmt->u.assoc_req.listen_interval =
279 cpu_to_le16(local->hw.conf.listen_interval);
280 }
281
282 /* SSID */
283 ies = pos = skb_put(skb, 2 + wk->assoc.ssid_len);
284 *pos++ = WLAN_EID_SSID;
285 *pos++ = wk->assoc.ssid_len;
286 memcpy(pos, wk->assoc.ssid, wk->assoc.ssid_len);
287
288 /* add all rates which were marked to be used above */
289 supp_rates_len = rates_len;
290 if (supp_rates_len > 8)
291 supp_rates_len = 8;
292
293 len = sband->n_bitrates;
294 pos = skb_put(skb, supp_rates_len + 2);
295 *pos++ = WLAN_EID_SUPP_RATES;
296 *pos++ = supp_rates_len;
297
298 count = 0;
299 for (i = 0; i < sband->n_bitrates; i++) {
300 if (BIT(i) & rates) {
301 int rate = sband->bitrates[i].bitrate;
302 *pos++ = (u8) (rate / 5);
303 if (++count == 8)
304 break;
305 }
306 }
307
308 if (rates_len > count) {
309 pos = skb_put(skb, rates_len - count + 2);
310 *pos++ = WLAN_EID_EXT_SUPP_RATES;
311 *pos++ = rates_len - count;
312
313 for (i++; i < sband->n_bitrates; i++) {
314 if (BIT(i) & rates) {
315 int rate = sband->bitrates[i].bitrate;
316 *pos++ = (u8) (rate / 5);
317 }
318 }
319 }
320
321 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
322 /* 1. power capabilities */
323 pos = skb_put(skb, 4);
324 *pos++ = WLAN_EID_PWR_CAPABILITY;
325 *pos++ = 2;
326 *pos++ = 0; /* min tx power */
327 *pos++ = wk->chan->max_power; /* max tx power */
328
329 /* 2. supported channels */
330 /* TODO: get this in reg domain format */
331 pos = skb_put(skb, 2 * sband->n_channels + 2);
332 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
333 *pos++ = 2 * sband->n_channels;
334 for (i = 0; i < sband->n_channels; i++) {
335 *pos++ = ieee80211_frequency_to_channel(
336 sband->channels[i].center_freq);
337 *pos++ = 1; /* one channel in the subband*/
338 }
339 }
340
341 /* if present, add any custom IEs that go before HT */
342 if (wk->ie_len && wk->ie) {
343 static const u8 before_ht[] = {
344 WLAN_EID_SSID,
345 WLAN_EID_SUPP_RATES,
346 WLAN_EID_EXT_SUPP_RATES,
347 WLAN_EID_PWR_CAPABILITY,
348 WLAN_EID_SUPPORTED_CHANNELS,
349 WLAN_EID_RSN,
350 WLAN_EID_QOS_CAPA,
351 WLAN_EID_RRM_ENABLED_CAPABILITIES,
352 WLAN_EID_MOBILITY_DOMAIN,
353 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
354 };
355 noffset = ieee80211_ie_split(wk->ie, wk->ie_len,
356 before_ht, ARRAY_SIZE(before_ht),
357 offset);
358 pos = skb_put(skb, noffset - offset);
359 memcpy(pos, wk->ie + offset, noffset - offset);
360 offset = noffset;
361 }
362
363 if (wk->assoc.use_11n && wk->assoc.wmm_used &&
364 local->hw.queues >= 4)
365 ieee80211_add_ht_ie(skb, wk->assoc.ht_information_ie,
366 sband, wk->chan, wk->assoc.smps);
367
368 /* if present, add any custom non-vendor IEs that go after HT */
369 if (wk->ie_len && wk->ie) {
370 noffset = ieee80211_ie_split_vendor(wk->ie, wk->ie_len,
371 offset);
372 pos = skb_put(skb, noffset - offset);
373 memcpy(pos, wk->ie + offset, noffset - offset);
374 offset = noffset;
375 }
376
377 if (wk->assoc.wmm_used && local->hw.queues >= 4) {
378 pos = skb_put(skb, 9);
379 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
380 *pos++ = 7; /* len */
381 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
382 *pos++ = 0x50;
383 *pos++ = 0xf2;
384 *pos++ = 2; /* WME */
385 *pos++ = 0; /* WME info */
386 *pos++ = 1; /* WME ver */
387 *pos++ = 0;
388 }
389
390 /* add any remaining custom (i.e. vendor specific here) IEs */
391 if (wk->ie_len && wk->ie) {
392 noffset = wk->ie_len;
393 pos = skb_put(skb, noffset - offset);
394 memcpy(pos, wk->ie + offset, noffset - offset);
395 }
396
397 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
398 ieee80211_tx_skb(sdata, skb);
399 }
400
401 static void ieee80211_remove_auth_bss(struct ieee80211_local *local,
402 struct ieee80211_work *wk)
403 {
404 struct cfg80211_bss *cbss;
405 u16 capa_val = WLAN_CAPABILITY_ESS;
406
407 if (wk->probe_auth.privacy)
408 capa_val |= WLAN_CAPABILITY_PRIVACY;
409
410 cbss = cfg80211_get_bss(local->hw.wiphy, wk->chan, wk->filter_ta,
411 wk->probe_auth.ssid, wk->probe_auth.ssid_len,
412 WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
413 capa_val);
414 if (!cbss)
415 return;
416
417 cfg80211_unlink_bss(local->hw.wiphy, cbss);
418 cfg80211_put_bss(cbss);
419 }
420
421 static enum work_action __must_check
422 ieee80211_direct_probe(struct ieee80211_work *wk)
423 {
424 struct ieee80211_sub_if_data *sdata = wk->sdata;
425 struct ieee80211_local *local = sdata->local;
426
427 wk->probe_auth.tries++;
428 if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
429 printk(KERN_DEBUG "%s: direct probe to %pM timed out\n",
430 sdata->name, wk->filter_ta);
431
432 /*
433 * Most likely AP is not in the range so remove the
434 * bss struct for that AP.
435 */
436 ieee80211_remove_auth_bss(local, wk);
437
438 /*
439 * We might have a pending scan which had no chance to run yet
440 * due to work needing to be done. Hence, queue the STAs work
441 * again for that.
442 */
443 ieee80211_queue_work(&local->hw, &local->work_work);
444 return WORK_ACT_TIMEOUT;
445 }
446
447 printk(KERN_DEBUG "%s: direct probe to %pM (try %d)\n",
448 sdata->name, wk->filter_ta, wk->probe_auth.tries);
449
450 /*
451 * Direct probe is sent to broadcast address as some APs
452 * will not answer to direct packet in unassociated state.
453 */
454 ieee80211_send_probe_req(sdata, NULL, wk->probe_auth.ssid,
455 wk->probe_auth.ssid_len, NULL, 0);
456
457 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
458 run_again(local, wk->timeout);
459
460 return WORK_ACT_NONE;
461 }
462
463
464 static enum work_action __must_check
465 ieee80211_authenticate(struct ieee80211_work *wk)
466 {
467 struct ieee80211_sub_if_data *sdata = wk->sdata;
468 struct ieee80211_local *local = sdata->local;
469
470 wk->probe_auth.tries++;
471 if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
472 printk(KERN_DEBUG "%s: authentication with %pM"
473 " timed out\n", sdata->name, wk->filter_ta);
474
475 /*
476 * Most likely AP is not in the range so remove the
477 * bss struct for that AP.
478 */
479 ieee80211_remove_auth_bss(local, wk);
480
481 /*
482 * We might have a pending scan which had no chance to run yet
483 * due to work needing to be done. Hence, queue the STAs work
484 * again for that.
485 */
486 ieee80211_queue_work(&local->hw, &local->work_work);
487 return WORK_ACT_TIMEOUT;
488 }
489
490 printk(KERN_DEBUG "%s: authenticate with %pM (try %d)\n",
491 sdata->name, wk->filter_ta, wk->probe_auth.tries);
492
493 ieee80211_send_auth(sdata, 1, wk->probe_auth.algorithm, wk->ie,
494 wk->ie_len, wk->filter_ta, NULL, 0, 0);
495 wk->probe_auth.transaction = 2;
496
497 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
498 run_again(local, wk->timeout);
499
500 return WORK_ACT_NONE;
501 }
502
503 static enum work_action __must_check
504 ieee80211_associate(struct ieee80211_work *wk)
505 {
506 struct ieee80211_sub_if_data *sdata = wk->sdata;
507 struct ieee80211_local *local = sdata->local;
508
509 wk->assoc.tries++;
510 if (wk->assoc.tries > IEEE80211_ASSOC_MAX_TRIES) {
511 printk(KERN_DEBUG "%s: association with %pM"
512 " timed out\n",
513 sdata->name, wk->filter_ta);
514
515 /*
516 * Most likely AP is not in the range so remove the
517 * bss struct for that AP.
518 */
519 if (wk->assoc.bss)
520 cfg80211_unlink_bss(local->hw.wiphy, wk->assoc.bss);
521
522 /*
523 * We might have a pending scan which had no chance to run yet
524 * due to work needing to be done. Hence, queue the STAs work
525 * again for that.
526 */
527 ieee80211_queue_work(&local->hw, &local->work_work);
528 return WORK_ACT_TIMEOUT;
529 }
530
531 printk(KERN_DEBUG "%s: associate with %pM (try %d)\n",
532 sdata->name, wk->filter_ta, wk->assoc.tries);
533 ieee80211_send_assoc(sdata, wk);
534
535 wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
536 run_again(local, wk->timeout);
537
538 return WORK_ACT_NONE;
539 }
540
541 static enum work_action __must_check
542 ieee80211_remain_on_channel_timeout(struct ieee80211_work *wk)
543 {
544 struct ieee80211_sub_if_data *sdata = wk->sdata;
545 struct ieee80211_local *local = sdata->local;
546
547 /*
548 * First time we run, do nothing -- the generic code will
549 * have switched to the right channel etc.
550 */
551 if (wk->timeout != wk->remain.timeout) {
552 wk->timeout = wk->remain.timeout;
553 return WORK_ACT_NONE;
554 }
555
556 /*
557 * We are done serving the remain-on-channel command; kill the work
558 * item to allow idle state to be entered again. In addition, clear the
559 * temporary channel information to allow operational channel to be
560 * used.
561 */
562 list_del(&wk->list);
563 free_work(wk);
564
565 if (local->tmp_channel) {
566 cfg80211_remain_on_channel_expired(sdata->dev, (u64)wk,
567 local->tmp_channel,
568 local->tmp_channel_type,
569 GFP_KERNEL);
570
571 local->tmp_channel = NULL;
572 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
573 ieee80211_offchannel_return(local, true);
574 }
575
576 return WORK_ACT_NONE;
577 }
578
579 static void ieee80211_auth_challenge(struct ieee80211_work *wk,
580 struct ieee80211_mgmt *mgmt,
581 size_t len)
582 {
583 struct ieee80211_sub_if_data *sdata = wk->sdata;
584 u8 *pos;
585 struct ieee802_11_elems elems;
586
587 pos = mgmt->u.auth.variable;
588 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
589 if (!elems.challenge)
590 return;
591 ieee80211_send_auth(sdata, 3, wk->probe_auth.algorithm,
592 elems.challenge - 2, elems.challenge_len + 2,
593 wk->filter_ta, wk->probe_auth.key,
594 wk->probe_auth.key_len, wk->probe_auth.key_idx);
595 wk->probe_auth.transaction = 4;
596 }
597
598 static enum work_action __must_check
599 ieee80211_rx_mgmt_auth(struct ieee80211_work *wk,
600 struct ieee80211_mgmt *mgmt, size_t len)
601 {
602 u16 auth_alg, auth_transaction, status_code;
603
604 if (wk->type != IEEE80211_WORK_AUTH)
605 return WORK_ACT_NONE;
606
607 if (len < 24 + 6)
608 return WORK_ACT_NONE;
609
610 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
611 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
612 status_code = le16_to_cpu(mgmt->u.auth.status_code);
613
614 if (auth_alg != wk->probe_auth.algorithm ||
615 auth_transaction != wk->probe_auth.transaction)
616 return WORK_ACT_NONE;
617
618 if (status_code != WLAN_STATUS_SUCCESS) {
619 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
620 wk->sdata->name, mgmt->sa, status_code);
621 return WORK_ACT_DONE;
622 }
623
624 switch (wk->probe_auth.algorithm) {
625 case WLAN_AUTH_OPEN:
626 case WLAN_AUTH_LEAP:
627 case WLAN_AUTH_FT:
628 break;
629 case WLAN_AUTH_SHARED_KEY:
630 if (wk->probe_auth.transaction != 4) {
631 ieee80211_auth_challenge(wk, mgmt, len);
632 /* need another frame */
633 return WORK_ACT_NONE;
634 }
635 break;
636 default:
637 WARN_ON(1);
638 return WORK_ACT_NONE;
639 }
640
641 printk(KERN_DEBUG "%s: authenticated\n", wk->sdata->name);
642 return WORK_ACT_DONE;
643 }
644
645 static enum work_action __must_check
646 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_work *wk,
647 struct ieee80211_mgmt *mgmt, size_t len,
648 bool reassoc)
649 {
650 struct ieee80211_sub_if_data *sdata = wk->sdata;
651 struct ieee80211_local *local = sdata->local;
652 u16 capab_info, status_code, aid;
653 struct ieee802_11_elems elems;
654 u8 *pos;
655
656 /*
657 * AssocResp and ReassocResp have identical structure, so process both
658 * of them in this function.
659 */
660
661 if (len < 24 + 6)
662 return WORK_ACT_NONE;
663
664 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
665 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
666 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
667
668 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
669 "status=%d aid=%d)\n",
670 sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
671 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
672
673 pos = mgmt->u.assoc_resp.variable;
674 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
675
676 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
677 elems.timeout_int && elems.timeout_int_len == 5 &&
678 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
679 u32 tu, ms;
680 tu = get_unaligned_le32(elems.timeout_int + 1);
681 ms = tu * 1024 / 1000;
682 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
683 "comeback duration %u TU (%u ms)\n",
684 sdata->name, mgmt->sa, tu, ms);
685 wk->timeout = jiffies + msecs_to_jiffies(ms);
686 if (ms > IEEE80211_ASSOC_TIMEOUT)
687 run_again(local, wk->timeout);
688 return WORK_ACT_NONE;
689 }
690
691 if (status_code != WLAN_STATUS_SUCCESS)
692 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
693 sdata->name, mgmt->sa, status_code);
694 else
695 printk(KERN_DEBUG "%s: associated\n", sdata->name);
696
697 return WORK_ACT_DONE;
698 }
699
700 static enum work_action __must_check
701 ieee80211_rx_mgmt_probe_resp(struct ieee80211_work *wk,
702 struct ieee80211_mgmt *mgmt, size_t len,
703 struct ieee80211_rx_status *rx_status)
704 {
705 struct ieee80211_sub_if_data *sdata = wk->sdata;
706 struct ieee80211_local *local = sdata->local;
707 size_t baselen;
708
709 ASSERT_WORK_MTX(local);
710
711 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
712 if (baselen > len)
713 return WORK_ACT_NONE;
714
715 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
716 return WORK_ACT_DONE;
717 }
718
719 static void ieee80211_work_rx_queued_mgmt(struct ieee80211_local *local,
720 struct sk_buff *skb)
721 {
722 struct ieee80211_rx_status *rx_status;
723 struct ieee80211_mgmt *mgmt;
724 struct ieee80211_work *wk;
725 enum work_action rma = WORK_ACT_NONE;
726 u16 fc;
727
728 rx_status = (struct ieee80211_rx_status *) skb->cb;
729 mgmt = (struct ieee80211_mgmt *) skb->data;
730 fc = le16_to_cpu(mgmt->frame_control);
731
732 mutex_lock(&local->work_mtx);
733
734 list_for_each_entry(wk, &local->work_list, list) {
735 const u8 *bssid = NULL;
736
737 switch (wk->type) {
738 case IEEE80211_WORK_DIRECT_PROBE:
739 case IEEE80211_WORK_AUTH:
740 case IEEE80211_WORK_ASSOC:
741 bssid = wk->filter_ta;
742 break;
743 default:
744 continue;
745 }
746
747 /*
748 * Before queuing, we already verified mgmt->sa,
749 * so this is needed just for matching.
750 */
751 if (compare_ether_addr(bssid, mgmt->bssid))
752 continue;
753
754 switch (fc & IEEE80211_FCTL_STYPE) {
755 case IEEE80211_STYPE_PROBE_RESP:
756 rma = ieee80211_rx_mgmt_probe_resp(wk, mgmt, skb->len,
757 rx_status);
758 break;
759 case IEEE80211_STYPE_AUTH:
760 rma = ieee80211_rx_mgmt_auth(wk, mgmt, skb->len);
761 break;
762 case IEEE80211_STYPE_ASSOC_RESP:
763 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
764 skb->len, false);
765 break;
766 case IEEE80211_STYPE_REASSOC_RESP:
767 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
768 skb->len, true);
769 break;
770 default:
771 WARN_ON(1);
772 }
773 /*
774 * We've processed this frame for that work, so it can't
775 * belong to another work struct.
776 * NB: this is also required for correctness for 'rma'!
777 */
778 break;
779 }
780
781 switch (rma) {
782 case WORK_ACT_NONE:
783 break;
784 case WORK_ACT_DONE:
785 list_del_rcu(&wk->list);
786 break;
787 default:
788 WARN(1, "unexpected: %d", rma);
789 }
790
791 mutex_unlock(&local->work_mtx);
792
793 if (rma != WORK_ACT_DONE)
794 goto out;
795
796 switch (wk->done(wk, skb)) {
797 case WORK_DONE_DESTROY:
798 free_work(wk);
799 break;
800 case WORK_DONE_REQUEUE:
801 synchronize_rcu();
802 wk->timeout = jiffies; /* run again directly */
803 mutex_lock(&local->work_mtx);
804 list_add_tail(&wk->list, &local->work_list);
805 mutex_unlock(&local->work_mtx);
806 }
807
808 out:
809 kfree_skb(skb);
810 }
811
812 static void ieee80211_work_timer(unsigned long data)
813 {
814 struct ieee80211_local *local = (void *) data;
815
816 if (local->quiescing)
817 return;
818
819 ieee80211_queue_work(&local->hw, &local->work_work);
820 }
821
822 static void ieee80211_work_work(struct work_struct *work)
823 {
824 struct ieee80211_local *local =
825 container_of(work, struct ieee80211_local, work_work);
826 struct sk_buff *skb;
827 struct ieee80211_work *wk, *tmp;
828 LIST_HEAD(free_work);
829 enum work_action rma;
830
831 if (local->scanning)
832 return;
833
834 /*
835 * ieee80211_queue_work() should have picked up most cases,
836 * here we'll pick the the rest.
837 */
838 if (WARN(local->suspended, "work scheduled while going to suspend\n"))
839 return;
840
841 /* first process frames to avoid timing out while a frame is pending */
842 while ((skb = skb_dequeue(&local->work_skb_queue)))
843 ieee80211_work_rx_queued_mgmt(local, skb);
844
845 ieee80211_recalc_idle(local);
846
847 mutex_lock(&local->work_mtx);
848
849 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
850 if (time_is_after_jiffies(wk->timeout)) {
851 /*
852 * This work item isn't supposed to be worked on
853 * right now, but take care to adjust the timer
854 * properly.
855 */
856 run_again(local, wk->timeout);
857 continue;
858 }
859
860 switch (wk->type) {
861 default:
862 WARN_ON(1);
863 /* nothing */
864 rma = WORK_ACT_NONE;
865 break;
866 case IEEE80211_WORK_ABORT:
867 rma = WORK_ACT_TIMEOUT;
868 case IEEE80211_WORK_DIRECT_PROBE:
869 rma = ieee80211_direct_probe(wk);
870 break;
871 case IEEE80211_WORK_AUTH:
872 rma = ieee80211_authenticate(wk);
873 break;
874 case IEEE80211_WORK_ASSOC:
875 rma = ieee80211_associate(wk);
876 break;
877 case IEEE80211_WORK_REMAIN_ON_CHANNEL:
878 rma = ieee80211_remain_on_channel_timeout(wk);
879 break;
880 }
881
882 switch (rma) {
883 case WORK_ACT_NONE:
884 /* no action required */
885 break;
886 case WORK_ACT_TIMEOUT:
887 list_del_rcu(&wk->list);
888 synchronize_rcu();
889 list_add(&wk->list, &free_work);
890 break;
891 default:
892 WARN(1, "unexpected: %d", rma);
893 }
894 }
895
896 if (list_empty(&local->work_list) && local->scan_req)
897 ieee80211_queue_delayed_work(&local->hw,
898 &local->scan_work,
899 round_jiffies_relative(0));
900
901 mutex_unlock(&local->work_mtx);
902
903 list_for_each_entry_safe(wk, tmp, &free_work, list) {
904 wk->done(wk, NULL);
905 list_del(&wk->list);
906 kfree(wk);
907 }
908 }
909
910 void ieee80211_add_work(struct ieee80211_work *wk)
911 {
912 struct ieee80211_local *local;
913
914 if (WARN_ON(!wk->chan))
915 return;
916
917 if (WARN_ON(!wk->sdata))
918 return;
919
920 if (WARN_ON(!wk->done))
921 return;
922
923 wk->timeout = jiffies;
924
925 local = wk->sdata->local;
926 mutex_lock(&local->work_mtx);
927 list_add_tail(&wk->list, &local->work_list);
928 mutex_unlock(&local->work_mtx);
929
930 ieee80211_queue_work(&local->hw, &local->work_work);
931 }
932
933 void ieee80211_work_init(struct ieee80211_local *local)
934 {
935 mutex_init(&local->work_mtx);
936 INIT_LIST_HEAD(&local->work_list);
937 setup_timer(&local->work_timer, ieee80211_work_timer,
938 (unsigned long)local);
939 INIT_WORK(&local->work_work, ieee80211_work_work);
940 skb_queue_head_init(&local->work_skb_queue);
941 }
942
943 void ieee80211_work_purge(struct ieee80211_sub_if_data *sdata)
944 {
945 struct ieee80211_local *local = sdata->local;
946 struct ieee80211_work *wk;
947
948 mutex_lock(&local->work_mtx);
949 list_for_each_entry(wk, &local->work_list, list) {
950 if (wk->sdata != sdata)
951 continue;
952 wk->type = IEEE80211_WORK_ABORT;
953 }
954 mutex_unlock(&local->work_mtx);
955
956 /* run cleanups etc. */
957 ieee80211_work_work(&local->work_work);
958
959 mutex_lock(&local->work_mtx);
960 list_for_each_entry(wk, &local->work_list, list) {
961 if (wk->sdata != sdata)
962 continue;
963 WARN_ON(1);
964 break;
965 }
966 mutex_unlock(&local->work_mtx);
967 }
968
969 ieee80211_rx_result ieee80211_work_rx_mgmt(struct ieee80211_sub_if_data *sdata,
970 struct sk_buff *skb)
971 {
972 struct ieee80211_local *local = sdata->local;
973 struct ieee80211_mgmt *mgmt;
974 struct ieee80211_work *wk;
975 u16 fc;
976
977 if (skb->len < 24)
978 return RX_DROP_MONITOR;
979
980 mgmt = (struct ieee80211_mgmt *) skb->data;
981 fc = le16_to_cpu(mgmt->frame_control);
982
983 list_for_each_entry_rcu(wk, &local->work_list, list) {
984 if (sdata != wk->sdata)
985 continue;
986 if (compare_ether_addr(wk->filter_ta, mgmt->sa))
987 continue;
988 if (compare_ether_addr(wk->filter_ta, mgmt->bssid))
989 continue;
990
991 switch (fc & IEEE80211_FCTL_STYPE) {
992 case IEEE80211_STYPE_AUTH:
993 case IEEE80211_STYPE_PROBE_RESP:
994 case IEEE80211_STYPE_ASSOC_RESP:
995 case IEEE80211_STYPE_REASSOC_RESP:
996 case IEEE80211_STYPE_DEAUTH:
997 case IEEE80211_STYPE_DISASSOC:
998 skb_queue_tail(&local->work_skb_queue, skb);
999 ieee80211_queue_work(&local->hw, &local->work_work);
1000 return RX_QUEUED;
1001 }
1002 }
1003
1004 return RX_CONTINUE;
1005 }
1006
1007 int ieee80211_wk_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1008 struct ieee80211_channel *chan,
1009 enum nl80211_channel_type channel_type,
1010 unsigned int duration, u64 *cookie)
1011 {
1012 struct ieee80211_local *local = sdata->local;
1013 struct ieee80211_work *wk;
1014
1015 wk = kzalloc(sizeof(*wk), GFP_KERNEL);
1016 if (!wk)
1017 return -ENOMEM;
1018
1019 wk->type = IEEE80211_WORK_REMAIN_ON_CHANNEL;
1020 wk->chan = chan;
1021 wk->sdata = sdata;
1022
1023 wk->remain.timeout = jiffies + msecs_to_jiffies(duration);
1024
1025 *cookie = (u64)wk;
1026
1027 ieee80211_add_work(wk);
1028
1029 /*
1030 * TODO: could optimize this by leaving the station vifs in awake mode
1031 * if they happen to be on the same channel as the requested channel
1032 */
1033 ieee80211_offchannel_stop_beaconing(local);
1034 ieee80211_offchannel_stop_station(local);
1035
1036 sdata->local->tmp_channel = chan;
1037 sdata->local->tmp_channel_type = channel_type;
1038 ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
1039
1040 cfg80211_ready_on_channel(sdata->dev, (u64)wk, chan, channel_type,
1041 duration, GFP_KERNEL);
1042
1043 return 0;
1044 }
1045
1046 int ieee80211_wk_cancel_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1047 u64 cookie)
1048 {
1049 struct ieee80211_local *local = sdata->local;
1050 struct ieee80211_work *wk, *tmp;
1051 bool found = false;
1052
1053 mutex_lock(&local->work_mtx);
1054 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
1055 if ((u64)wk == cookie) {
1056 found = true;
1057 list_del(&wk->list);
1058 free_work(wk);
1059 break;
1060 }
1061 }
1062 mutex_unlock(&local->work_mtx);
1063
1064 if (!found)
1065 return -ENOENT;
1066
1067 if (sdata->local->tmp_channel) {
1068 sdata->local->tmp_channel = NULL;
1069 ieee80211_hw_config(sdata->local,
1070 IEEE80211_CONF_CHANGE_CHANNEL);
1071 ieee80211_offchannel_return(sdata->local, true);
1072 }
1073
1074 ieee80211_recalc_idle(local);
1075
1076 return 0;
1077 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree