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staging:iio: ring core cleanups + check if read_last available in lis3l02dq
[linux-2.6/libata-dev.git] / net / mac80211 / work.c
blobe73c8cae036b42fec668d3473922164b3e22ef26
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 <linux/slab.h>
23 #include <net/mac80211.h>
24 #include <asm/unaligned.h>
25
26 #include "ieee80211_i.h"
27 #include "rate.h"
28
29 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
30 #define IEEE80211_AUTH_MAX_TRIES 3
31 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
32 #define IEEE80211_ASSOC_MAX_TRIES 3
33
34 enum work_action {
35 WORK_ACT_MISMATCH,
36 WORK_ACT_NONE,
37 WORK_ACT_TIMEOUT,
38 WORK_ACT_DONE,
39 };
40
41
42 /* utils */
43 static inline void ASSERT_WORK_MTX(struct ieee80211_local *local)
44 {
45 lockdep_assert_held(&local->mtx);
46 }
47
48 /*
49 * We can have multiple work items (and connection probing)
50 * scheduling this timer, but we need to take care to only
51 * reschedule it when it should fire _earlier_ than it was
52 * asked for before, or if it's not pending right now. This
53 * function ensures that. Note that it then is required to
54 * run this function for all timeouts after the first one
55 * has happened -- the work that runs from this timer will
56 * do that.
57 */
58 static void run_again(struct ieee80211_local *local,
59 unsigned long timeout)
60 {
61 ASSERT_WORK_MTX(local);
62
63 if (!timer_pending(&local->work_timer) ||
64 time_before(timeout, local->work_timer.expires))
65 mod_timer(&local->work_timer, timeout);
66 }
67
68 static void work_free_rcu(struct rcu_head *head)
69 {
70 struct ieee80211_work *wk =
71 container_of(head, struct ieee80211_work, rcu_head);
72
73 kfree(wk);
74 }
75
76 void free_work(struct ieee80211_work *wk)
77 {
78 call_rcu(&wk->rcu_head, work_free_rcu);
79 }
80
81 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
82 struct ieee80211_supported_band *sband,
83 u32 *rates)
84 {
85 int i, j, count;
86 *rates = 0;
87 count = 0;
88 for (i = 0; i < supp_rates_len; i++) {
89 int rate = (supp_rates[i] & 0x7F) * 5;
90
91 for (j = 0; j < sband->n_bitrates; j++)
92 if (sband->bitrates[j].bitrate == rate) {
93 *rates |= BIT(j);
94 count++;
95 break;
96 }
97 }
98
99 return count;
100 }
101
102 /* frame sending functions */
103
104 static void ieee80211_add_ht_ie(struct sk_buff *skb, const u8 *ht_info_ie,
105 struct ieee80211_supported_band *sband,
106 struct ieee80211_channel *channel,
107 enum ieee80211_smps_mode smps)
108 {
109 struct ieee80211_ht_info *ht_info;
110 u8 *pos;
111 u32 flags = channel->flags;
112 u16 cap = sband->ht_cap.cap;
113 __le16 tmp;
114
115 if (!sband->ht_cap.ht_supported)
116 return;
117
118 if (!ht_info_ie)
119 return;
120
121 if (ht_info_ie[1] < sizeof(struct ieee80211_ht_info))
122 return;
123
124 ht_info = (struct ieee80211_ht_info *)(ht_info_ie + 2);
125
126 /* determine capability flags */
127
128 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
129 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
130 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
131 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
132 cap &= ~IEEE80211_HT_CAP_SGI_40;
133 }
134 break;
135 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
136 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
137 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
138 cap &= ~IEEE80211_HT_CAP_SGI_40;
139 }
140 break;
141 }
142
143 /* set SM PS mode properly */
144 cap &= ~IEEE80211_HT_CAP_SM_PS;
145 switch (smps) {
146 case IEEE80211_SMPS_AUTOMATIC:
147 case IEEE80211_SMPS_NUM_MODES:
148 WARN_ON(1);
149 case IEEE80211_SMPS_OFF:
150 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
151 IEEE80211_HT_CAP_SM_PS_SHIFT;
152 break;
153 case IEEE80211_SMPS_STATIC:
154 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
155 IEEE80211_HT_CAP_SM_PS_SHIFT;
156 break;
157 case IEEE80211_SMPS_DYNAMIC:
158 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
159 IEEE80211_HT_CAP_SM_PS_SHIFT;
160 break;
161 }
162
163 /* reserve and fill IE */
164
165 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
166 *pos++ = WLAN_EID_HT_CAPABILITY;
167 *pos++ = sizeof(struct ieee80211_ht_cap);
168 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
169
170 /* capability flags */
171 tmp = cpu_to_le16(cap);
172 memcpy(pos, &tmp, sizeof(u16));
173 pos += sizeof(u16);
174
175 /* AMPDU parameters */
176 *pos++ = sband->ht_cap.ampdu_factor |
177 (sband->ht_cap.ampdu_density <<
178 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
179
180 /* MCS set */
181 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
182 pos += sizeof(sband->ht_cap.mcs);
183
184 /* extended capabilities */
185 pos += sizeof(__le16);
186
187 /* BF capabilities */
188 pos += sizeof(__le32);
189
190 /* antenna selection */
191 pos += sizeof(u8);
192 }
193
194 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
195 struct ieee80211_work *wk)
196 {
197 struct ieee80211_local *local = sdata->local;
198 struct sk_buff *skb;
199 struct ieee80211_mgmt *mgmt;
200 u8 *pos, qos_info;
201 const u8 *ies;
202 size_t offset = 0, noffset;
203 int i, len, count, rates_len, supp_rates_len;
204 u16 capab;
205 struct ieee80211_supported_band *sband;
206 u32 rates = 0;
207
208 sband = local->hw.wiphy->bands[wk->chan->band];
209
210 if (wk->assoc.supp_rates_len) {
211 /*
212 * Get all rates supported by the device and the AP as
213 * some APs don't like getting a superset of their rates
214 * in the association request (e.g. D-Link DAP 1353 in
215 * b-only mode)...
216 */
217 rates_len = ieee80211_compatible_rates(wk->assoc.supp_rates,
218 wk->assoc.supp_rates_len,
219 sband, &rates);
220 } else {
221 /*
222 * In case AP not provide any supported rates information
223 * before association, we send information element(s) with
224 * all rates that we support.
225 */
226 rates = ~0;
227 rates_len = sband->n_bitrates;
228 }
229
230 skb = alloc_skb(local->hw.extra_tx_headroom +
231 sizeof(*mgmt) + /* bit too much but doesn't matter */
232 2 + wk->assoc.ssid_len + /* SSID */
233 4 + rates_len + /* (extended) rates */
234 4 + /* power capability */
235 2 + 2 * sband->n_channels + /* supported channels */
236 2 + sizeof(struct ieee80211_ht_cap) + /* HT */
237 wk->ie_len + /* extra IEs */
238 9, /* WMM */
239 GFP_KERNEL);
240 if (!skb) {
241 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
242 "frame\n", sdata->name);
243 return;
244 }
245 skb_reserve(skb, local->hw.extra_tx_headroom);
246
247 capab = WLAN_CAPABILITY_ESS;
248
249 if (sband->band == IEEE80211_BAND_2GHZ) {
250 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
251 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
252 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
253 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
254 }
255
256 if (wk->assoc.capability & WLAN_CAPABILITY_PRIVACY)
257 capab |= WLAN_CAPABILITY_PRIVACY;
258
259 if ((wk->assoc.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
260 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
261 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
262
263 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
264 memset(mgmt, 0, 24);
265 memcpy(mgmt->da, wk->filter_ta, ETH_ALEN);
266 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
267 memcpy(mgmt->bssid, wk->filter_ta, ETH_ALEN);
268
269 if (!is_zero_ether_addr(wk->assoc.prev_bssid)) {
270 skb_put(skb, 10);
271 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
272 IEEE80211_STYPE_REASSOC_REQ);
273 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
274 mgmt->u.reassoc_req.listen_interval =
275 cpu_to_le16(local->hw.conf.listen_interval);
276 memcpy(mgmt->u.reassoc_req.current_ap, wk->assoc.prev_bssid,
277 ETH_ALEN);
278 } else {
279 skb_put(skb, 4);
280 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
281 IEEE80211_STYPE_ASSOC_REQ);
282 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
283 mgmt->u.assoc_req.listen_interval =
284 cpu_to_le16(local->hw.conf.listen_interval);
285 }
286
287 /* SSID */
288 ies = pos = skb_put(skb, 2 + wk->assoc.ssid_len);
289 *pos++ = WLAN_EID_SSID;
290 *pos++ = wk->assoc.ssid_len;
291 memcpy(pos, wk->assoc.ssid, wk->assoc.ssid_len);
292
293 /* add all rates which were marked to be used above */
294 supp_rates_len = rates_len;
295 if (supp_rates_len > 8)
296 supp_rates_len = 8;
297
298 len = sband->n_bitrates;
299 pos = skb_put(skb, supp_rates_len + 2);
300 *pos++ = WLAN_EID_SUPP_RATES;
301 *pos++ = supp_rates_len;
302
303 count = 0;
304 for (i = 0; i < sband->n_bitrates; i++) {
305 if (BIT(i) & rates) {
306 int rate = sband->bitrates[i].bitrate;
307 *pos++ = (u8) (rate / 5);
308 if (++count == 8)
309 break;
310 }
311 }
312
313 if (rates_len > count) {
314 pos = skb_put(skb, rates_len - count + 2);
315 *pos++ = WLAN_EID_EXT_SUPP_RATES;
316 *pos++ = rates_len - count;
317
318 for (i++; i < sband->n_bitrates; i++) {
319 if (BIT(i) & rates) {
320 int rate = sband->bitrates[i].bitrate;
321 *pos++ = (u8) (rate / 5);
322 }
323 }
324 }
325
326 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
327 /* 1. power capabilities */
328 pos = skb_put(skb, 4);
329 *pos++ = WLAN_EID_PWR_CAPABILITY;
330 *pos++ = 2;
331 *pos++ = 0; /* min tx power */
332 *pos++ = wk->chan->max_power; /* max tx power */
333
334 /* 2. supported channels */
335 /* TODO: get this in reg domain format */
336 pos = skb_put(skb, 2 * sband->n_channels + 2);
337 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
338 *pos++ = 2 * sband->n_channels;
339 for (i = 0; i < sband->n_channels; i++) {
340 *pos++ = ieee80211_frequency_to_channel(
341 sband->channels[i].center_freq);
342 *pos++ = 1; /* one channel in the subband*/
343 }
344 }
345
346 /* if present, add any custom IEs that go before HT */
347 if (wk->ie_len && wk->ie) {
348 static const u8 before_ht[] = {
349 WLAN_EID_SSID,
350 WLAN_EID_SUPP_RATES,
351 WLAN_EID_EXT_SUPP_RATES,
352 WLAN_EID_PWR_CAPABILITY,
353 WLAN_EID_SUPPORTED_CHANNELS,
354 WLAN_EID_RSN,
355 WLAN_EID_QOS_CAPA,
356 WLAN_EID_RRM_ENABLED_CAPABILITIES,
357 WLAN_EID_MOBILITY_DOMAIN,
358 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
359 };
360 noffset = ieee80211_ie_split(wk->ie, wk->ie_len,
361 before_ht, ARRAY_SIZE(before_ht),
362 offset);
363 pos = skb_put(skb, noffset - offset);
364 memcpy(pos, wk->ie + offset, noffset - offset);
365 offset = noffset;
366 }
367
368 if (wk->assoc.use_11n && wk->assoc.wmm_used &&
369 local->hw.queues >= 4)
370 ieee80211_add_ht_ie(skb, wk->assoc.ht_information_ie,
371 sband, wk->chan, wk->assoc.smps);
372
373 /* if present, add any custom non-vendor IEs that go after HT */
374 if (wk->ie_len && wk->ie) {
375 noffset = ieee80211_ie_split_vendor(wk->ie, wk->ie_len,
376 offset);
377 pos = skb_put(skb, noffset - offset);
378 memcpy(pos, wk->ie + offset, noffset - offset);
379 offset = noffset;
380 }
381
382 if (wk->assoc.wmm_used && local->hw.queues >= 4) {
383 if (wk->assoc.uapsd_used) {
384 qos_info = local->uapsd_queues;
385 qos_info |= (local->uapsd_max_sp_len <<
386 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
387 } else {
388 qos_info = 0;
389 }
390
391 pos = skb_put(skb, 9);
392 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
393 *pos++ = 7; /* len */
394 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
395 *pos++ = 0x50;
396 *pos++ = 0xf2;
397 *pos++ = 2; /* WME */
398 *pos++ = 0; /* WME info */
399 *pos++ = 1; /* WME ver */
400 *pos++ = qos_info;
401 }
402
403 /* add any remaining custom (i.e. vendor specific here) IEs */
404 if (wk->ie_len && wk->ie) {
405 noffset = wk->ie_len;
406 pos = skb_put(skb, noffset - offset);
407 memcpy(pos, wk->ie + offset, noffset - offset);
408 }
409
410 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
411 ieee80211_tx_skb(sdata, skb);
412 }
413
414 static void ieee80211_remove_auth_bss(struct ieee80211_local *local,
415 struct ieee80211_work *wk)
416 {
417 struct cfg80211_bss *cbss;
418 u16 capa_val = WLAN_CAPABILITY_ESS;
419
420 if (wk->probe_auth.privacy)
421 capa_val |= WLAN_CAPABILITY_PRIVACY;
422
423 cbss = cfg80211_get_bss(local->hw.wiphy, wk->chan, wk->filter_ta,
424 wk->probe_auth.ssid, wk->probe_auth.ssid_len,
425 WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
426 capa_val);
427 if (!cbss)
428 return;
429
430 cfg80211_unlink_bss(local->hw.wiphy, cbss);
431 cfg80211_put_bss(cbss);
432 }
433
434 static enum work_action __must_check
435 ieee80211_direct_probe(struct ieee80211_work *wk)
436 {
437 struct ieee80211_sub_if_data *sdata = wk->sdata;
438 struct ieee80211_local *local = sdata->local;
439
440 wk->probe_auth.tries++;
441 if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
442 printk(KERN_DEBUG "%s: direct probe to %pM timed out\n",
443 sdata->name, wk->filter_ta);
444
445 /*
446 * Most likely AP is not in the range so remove the
447 * bss struct for that AP.
448 */
449 ieee80211_remove_auth_bss(local, wk);
450
451 return WORK_ACT_TIMEOUT;
452 }
453
454 printk(KERN_DEBUG "%s: direct probe to %pM (try %d/%i)\n",
455 sdata->name, wk->filter_ta, wk->probe_auth.tries,
456 IEEE80211_AUTH_MAX_TRIES);
457
458 /*
459 * Direct probe is sent to broadcast address as some APs
460 * will not answer to direct packet in unassociated state.
461 */
462 ieee80211_send_probe_req(sdata, NULL, wk->probe_auth.ssid,
463 wk->probe_auth.ssid_len, NULL, 0);
464
465 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
466 run_again(local, wk->timeout);
467
468 return WORK_ACT_NONE;
469 }
470
471
472 static enum work_action __must_check
473 ieee80211_authenticate(struct ieee80211_work *wk)
474 {
475 struct ieee80211_sub_if_data *sdata = wk->sdata;
476 struct ieee80211_local *local = sdata->local;
477
478 wk->probe_auth.tries++;
479 if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
480 printk(KERN_DEBUG "%s: authentication with %pM"
481 " timed out\n", sdata->name, wk->filter_ta);
482
483 /*
484 * Most likely AP is not in the range so remove the
485 * bss struct for that AP.
486 */
487 ieee80211_remove_auth_bss(local, wk);
488
489 return WORK_ACT_TIMEOUT;
490 }
491
492 printk(KERN_DEBUG "%s: authenticate with %pM (try %d)\n",
493 sdata->name, wk->filter_ta, wk->probe_auth.tries);
494
495 ieee80211_send_auth(sdata, 1, wk->probe_auth.algorithm, wk->ie,
496 wk->ie_len, wk->filter_ta, NULL, 0, 0);
497 wk->probe_auth.transaction = 2;
498
499 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
500 run_again(local, wk->timeout);
501
502 return WORK_ACT_NONE;
503 }
504
505 static enum work_action __must_check
506 ieee80211_associate(struct ieee80211_work *wk)
507 {
508 struct ieee80211_sub_if_data *sdata = wk->sdata;
509 struct ieee80211_local *local = sdata->local;
510
511 wk->assoc.tries++;
512 if (wk->assoc.tries > IEEE80211_ASSOC_MAX_TRIES) {
513 printk(KERN_DEBUG "%s: association with %pM"
514 " timed out\n",
515 sdata->name, wk->filter_ta);
516
517 /*
518 * Most likely AP is not in the range so remove the
519 * bss struct for that AP.
520 */
521 if (wk->assoc.bss)
522 cfg80211_unlink_bss(local->hw.wiphy, wk->assoc.bss);
523
524 return WORK_ACT_TIMEOUT;
525 }
526
527 printk(KERN_DEBUG "%s: associate with %pM (try %d)\n",
528 sdata->name, wk->filter_ta, wk->assoc.tries);
529 ieee80211_send_assoc(sdata, wk);
530
531 wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
532 run_again(local, wk->timeout);
533
534 return WORK_ACT_NONE;
535 }
536
537 static enum work_action __must_check
538 ieee80211_remain_on_channel_timeout(struct ieee80211_work *wk)
539 {
540 /*
541 * First time we run, do nothing -- the generic code will
542 * have switched to the right channel etc.
543 */
544 if (!wk->started) {
545 wk->timeout = jiffies + msecs_to_jiffies(wk->remain.duration);
546
547 cfg80211_ready_on_channel(wk->sdata->dev, (unsigned long) wk,
548 wk->chan, wk->chan_type,
549 wk->remain.duration, GFP_KERNEL);
550
551 return WORK_ACT_NONE;
552 }
553
554 return WORK_ACT_TIMEOUT;
555 }
556
557 static enum work_action __must_check
558 ieee80211_offchannel_tx(struct ieee80211_work *wk)
559 {
560 if (!wk->started) {
561 wk->timeout = jiffies + msecs_to_jiffies(wk->offchan_tx.wait);
562
563 /*
564 * After this, offchan_tx.frame remains but now is no
565 * longer a valid pointer -- we still need it as the
566 * cookie for canceling this work.
567 */
568 ieee80211_tx_skb(wk->sdata, wk->offchan_tx.frame);
569
570 return WORK_ACT_NONE;
571 }
572
573 return WORK_ACT_TIMEOUT;
574 }
575
576 static enum work_action __must_check
577 ieee80211_assoc_beacon_wait(struct ieee80211_work *wk)
578 {
579 if (wk->started)
580 return WORK_ACT_TIMEOUT;
581
582 /*
583 * Wait up to one beacon interval ...
584 * should this be more if we miss one?
585 */
586 printk(KERN_DEBUG "%s: waiting for beacon from %pM\n",
587 wk->sdata->name, wk->filter_ta);
588 wk->timeout = TU_TO_EXP_TIME(wk->assoc.bss->beacon_interval);
589 return WORK_ACT_NONE;
590 }
591
592 static void ieee80211_auth_challenge(struct ieee80211_work *wk,
593 struct ieee80211_mgmt *mgmt,
594 size_t len)
595 {
596 struct ieee80211_sub_if_data *sdata = wk->sdata;
597 u8 *pos;
598 struct ieee802_11_elems elems;
599
600 pos = mgmt->u.auth.variable;
601 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
602 if (!elems.challenge)
603 return;
604 ieee80211_send_auth(sdata, 3, wk->probe_auth.algorithm,
605 elems.challenge - 2, elems.challenge_len + 2,
606 wk->filter_ta, wk->probe_auth.key,
607 wk->probe_auth.key_len, wk->probe_auth.key_idx);
608 wk->probe_auth.transaction = 4;
609 }
610
611 static enum work_action __must_check
612 ieee80211_rx_mgmt_auth(struct ieee80211_work *wk,
613 struct ieee80211_mgmt *mgmt, size_t len)
614 {
615 u16 auth_alg, auth_transaction, status_code;
616
617 if (wk->type != IEEE80211_WORK_AUTH)
618 return WORK_ACT_MISMATCH;
619
620 if (len < 24 + 6)
621 return WORK_ACT_NONE;
622
623 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
624 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
625 status_code = le16_to_cpu(mgmt->u.auth.status_code);
626
627 if (auth_alg != wk->probe_auth.algorithm ||
628 auth_transaction != wk->probe_auth.transaction)
629 return WORK_ACT_NONE;
630
631 if (status_code != WLAN_STATUS_SUCCESS) {
632 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
633 wk->sdata->name, mgmt->sa, status_code);
634 return WORK_ACT_DONE;
635 }
636
637 switch (wk->probe_auth.algorithm) {
638 case WLAN_AUTH_OPEN:
639 case WLAN_AUTH_LEAP:
640 case WLAN_AUTH_FT:
641 break;
642 case WLAN_AUTH_SHARED_KEY:
643 if (wk->probe_auth.transaction != 4) {
644 ieee80211_auth_challenge(wk, mgmt, len);
645 /* need another frame */
646 return WORK_ACT_NONE;
647 }
648 break;
649 default:
650 WARN_ON(1);
651 return WORK_ACT_NONE;
652 }
653
654 printk(KERN_DEBUG "%s: authenticated\n", wk->sdata->name);
655 return WORK_ACT_DONE;
656 }
657
658 static enum work_action __must_check
659 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_work *wk,
660 struct ieee80211_mgmt *mgmt, size_t len,
661 bool reassoc)
662 {
663 struct ieee80211_sub_if_data *sdata = wk->sdata;
664 struct ieee80211_local *local = sdata->local;
665 u16 capab_info, status_code, aid;
666 struct ieee802_11_elems elems;
667 u8 *pos;
668
669 if (wk->type != IEEE80211_WORK_ASSOC)
670 return WORK_ACT_MISMATCH;
671
672 /*
673 * AssocResp and ReassocResp have identical structure, so process both
674 * of them in this function.
675 */
676
677 if (len < 24 + 6)
678 return WORK_ACT_NONE;
679
680 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
681 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
682 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
683
684 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
685 "status=%d aid=%d)\n",
686 sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
687 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
688
689 pos = mgmt->u.assoc_resp.variable;
690 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
691
692 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
693 elems.timeout_int && elems.timeout_int_len == 5 &&
694 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
695 u32 tu, ms;
696 tu = get_unaligned_le32(elems.timeout_int + 1);
697 ms = tu * 1024 / 1000;
698 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
699 "comeback duration %u TU (%u ms)\n",
700 sdata->name, mgmt->sa, tu, ms);
701 wk->timeout = jiffies + msecs_to_jiffies(ms);
702 if (ms > IEEE80211_ASSOC_TIMEOUT)
703 run_again(local, wk->timeout);
704 return WORK_ACT_NONE;
705 }
706
707 if (status_code != WLAN_STATUS_SUCCESS)
708 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
709 sdata->name, mgmt->sa, status_code);
710 else
711 printk(KERN_DEBUG "%s: associated\n", sdata->name);
712
713 return WORK_ACT_DONE;
714 }
715
716 static enum work_action __must_check
717 ieee80211_rx_mgmt_probe_resp(struct ieee80211_work *wk,
718 struct ieee80211_mgmt *mgmt, size_t len,
719 struct ieee80211_rx_status *rx_status)
720 {
721 struct ieee80211_sub_if_data *sdata = wk->sdata;
722 struct ieee80211_local *local = sdata->local;
723 size_t baselen;
724
725 ASSERT_WORK_MTX(local);
726
727 if (wk->type != IEEE80211_WORK_DIRECT_PROBE)
728 return WORK_ACT_MISMATCH;
729
730 if (len < 24 + 12)
731 return WORK_ACT_NONE;
732
733 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
734 if (baselen > len)
735 return WORK_ACT_NONE;
736
737 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
738 return WORK_ACT_DONE;
739 }
740
741 static enum work_action __must_check
742 ieee80211_rx_mgmt_beacon(struct ieee80211_work *wk,
743 struct ieee80211_mgmt *mgmt, size_t len)
744 {
745 struct ieee80211_sub_if_data *sdata = wk->sdata;
746 struct ieee80211_local *local = sdata->local;
747
748 ASSERT_WORK_MTX(local);
749
750 if (wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
751 return WORK_ACT_MISMATCH;
752
753 if (len < 24 + 12)
754 return WORK_ACT_NONE;
755
756 printk(KERN_DEBUG "%s: beacon received\n", sdata->name);
757 return WORK_ACT_DONE;
758 }
759
760 static void ieee80211_work_rx_queued_mgmt(struct ieee80211_local *local,
761 struct sk_buff *skb)
762 {
763 struct ieee80211_rx_status *rx_status;
764 struct ieee80211_mgmt *mgmt;
765 struct ieee80211_work *wk;
766 enum work_action rma = WORK_ACT_NONE;
767 u16 fc;
768
769 rx_status = (struct ieee80211_rx_status *) skb->cb;
770 mgmt = (struct ieee80211_mgmt *) skb->data;
771 fc = le16_to_cpu(mgmt->frame_control);
772
773 mutex_lock(&local->mtx);
774
775 list_for_each_entry(wk, &local->work_list, list) {
776 const u8 *bssid = NULL;
777
778 switch (wk->type) {
779 case IEEE80211_WORK_DIRECT_PROBE:
780 case IEEE80211_WORK_AUTH:
781 case IEEE80211_WORK_ASSOC:
782 case IEEE80211_WORK_ASSOC_BEACON_WAIT:
783 bssid = wk->filter_ta;
784 break;
785 default:
786 continue;
787 }
788
789 /*
790 * Before queuing, we already verified mgmt->sa,
791 * so this is needed just for matching.
792 */
793 if (compare_ether_addr(bssid, mgmt->bssid))
794 continue;
795
796 switch (fc & IEEE80211_FCTL_STYPE) {
797 case IEEE80211_STYPE_BEACON:
798 rma = ieee80211_rx_mgmt_beacon(wk, mgmt, skb->len);
799 break;
800 case IEEE80211_STYPE_PROBE_RESP:
801 rma = ieee80211_rx_mgmt_probe_resp(wk, mgmt, skb->len,
802 rx_status);
803 break;
804 case IEEE80211_STYPE_AUTH:
805 rma = ieee80211_rx_mgmt_auth(wk, mgmt, skb->len);
806 break;
807 case IEEE80211_STYPE_ASSOC_RESP:
808 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
809 skb->len, false);
810 break;
811 case IEEE80211_STYPE_REASSOC_RESP:
812 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
813 skb->len, true);
814 break;
815 default:
816 WARN_ON(1);
817 rma = WORK_ACT_NONE;
818 }
819
820 /*
821 * We've either received an unexpected frame, or we have
822 * multiple work items and need to match the frame to the
823 * right one.
824 */
825 if (rma == WORK_ACT_MISMATCH)
826 continue;
827
828 /*
829 * We've processed this frame for that work, so it can't
830 * belong to another work struct.
831 * NB: this is also required for correctness for 'rma'!
832 */
833 break;
834 }
835
836 switch (rma) {
837 case WORK_ACT_MISMATCH:
838 /* ignore this unmatched frame */
839 break;
840 case WORK_ACT_NONE:
841 break;
842 case WORK_ACT_DONE:
843 list_del_rcu(&wk->list);
844 break;
845 default:
846 WARN(1, "unexpected: %d", rma);
847 }
848
849 mutex_unlock(&local->mtx);
850
851 if (rma != WORK_ACT_DONE)
852 goto out;
853
854 switch (wk->done(wk, skb)) {
855 case WORK_DONE_DESTROY:
856 free_work(wk);
857 break;
858 case WORK_DONE_REQUEUE:
859 synchronize_rcu();
860 wk->started = false; /* restart */
861 mutex_lock(&local->mtx);
862 list_add_tail(&wk->list, &local->work_list);
863 mutex_unlock(&local->mtx);
864 }
865
866 out:
867 kfree_skb(skb);
868 }
869
870 static bool ieee80211_work_ct_coexists(enum nl80211_channel_type wk_ct,
871 enum nl80211_channel_type oper_ct)
872 {
873 switch (wk_ct) {
874 case NL80211_CHAN_NO_HT:
875 return true;
876 case NL80211_CHAN_HT20:
877 if (oper_ct != NL80211_CHAN_NO_HT)
878 return true;
879 return false;
880 case NL80211_CHAN_HT40MINUS:
881 case NL80211_CHAN_HT40PLUS:
882 return (wk_ct == oper_ct);
883 }
884 WARN_ON(1); /* shouldn't get here */
885 return false;
886 }
887
888 static enum nl80211_channel_type
889 ieee80211_calc_ct(enum nl80211_channel_type wk_ct,
890 enum nl80211_channel_type oper_ct)
891 {
892 switch (wk_ct) {
893 case NL80211_CHAN_NO_HT:
894 return oper_ct;
895 case NL80211_CHAN_HT20:
896 if (oper_ct != NL80211_CHAN_NO_HT)
897 return oper_ct;
898 return wk_ct;
899 case NL80211_CHAN_HT40MINUS:
900 case NL80211_CHAN_HT40PLUS:
901 return wk_ct;
902 }
903 WARN_ON(1); /* shouldn't get here */
904 return wk_ct;
905 }
906
907
908 static void ieee80211_work_timer(unsigned long data)
909 {
910 struct ieee80211_local *local = (void *) data;
911
912 if (local->quiescing)
913 return;
914
915 ieee80211_queue_work(&local->hw, &local->work_work);
916 }
917
918 static void ieee80211_work_work(struct work_struct *work)
919 {
920 struct ieee80211_local *local =
921 container_of(work, struct ieee80211_local, work_work);
922 struct sk_buff *skb;
923 struct ieee80211_work *wk, *tmp;
924 LIST_HEAD(free_work);
925 enum work_action rma;
926 bool remain_off_channel = false;
927
928 if (local->scanning)
929 return;
930
931 /*
932 * ieee80211_queue_work() should have picked up most cases,
933 * here we'll pick the rest.
934 */
935 if (WARN(local->suspended, "work scheduled while going to suspend\n"))
936 return;
937
938 /* first process frames to avoid timing out while a frame is pending */
939 while ((skb = skb_dequeue(&local->work_skb_queue)))
940 ieee80211_work_rx_queued_mgmt(local, skb);
941
942 mutex_lock(&local->mtx);
943
944 ieee80211_recalc_idle(local);
945
946 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
947 bool started = wk->started;
948
949 /* mark work as started if it's on the current off-channel */
950 if (!started && local->tmp_channel &&
951 wk->chan == local->tmp_channel &&
952 wk->chan_type == local->tmp_channel_type) {
953 started = true;
954 wk->timeout = jiffies;
955 }
956
957 if (!started && !local->tmp_channel) {
958 bool on_oper_chan;
959 bool tmp_chan_changed = false;
960 bool on_oper_chan2;
961 enum nl80211_channel_type wk_ct;
962 on_oper_chan = ieee80211_cfg_on_oper_channel(local);
963
964 /* Work with existing channel type if possible. */
965 wk_ct = wk->chan_type;
966 if (wk->chan == local->hw.conf.channel)
967 wk_ct = ieee80211_calc_ct(wk->chan_type,
968 local->hw.conf.channel_type);
969
970 if (local->tmp_channel)
971 if ((local->tmp_channel != wk->chan) ||
972 (local->tmp_channel_type != wk_ct))
973 tmp_chan_changed = true;
974
975 local->tmp_channel = wk->chan;
976 local->tmp_channel_type = wk_ct;
977 /*
978 * Leave the station vifs in awake mode if they
979 * happen to be on the same channel as
980 * the requested channel.
981 */
982 on_oper_chan2 = ieee80211_cfg_on_oper_channel(local);
983 if (on_oper_chan != on_oper_chan2) {
984 if (on_oper_chan2) {
985 /* going off oper channel, PS too */
986 ieee80211_offchannel_stop_vifs(local,
987 true);
988 ieee80211_hw_config(local, 0);
989 } else {
990 /* going on channel, but leave PS
991 * off-channel. */
992 ieee80211_hw_config(local, 0);
993 ieee80211_offchannel_return(local,
994 true,
995 false);
996 }
997 } else if (tmp_chan_changed)
998 /* Still off-channel, but on some other
999 * channel, so update hardware.
1000 * PS should already be off-channel.
1001 */
1002 ieee80211_hw_config(local, 0);
1003
1004 started = true;
1005 wk->timeout = jiffies;
1006 }
1007
1008 /* don't try to work with items that aren't started */
1009 if (!started)
1010 continue;
1011
1012 if (time_is_after_jiffies(wk->timeout)) {
1013 /*
1014 * This work item isn't supposed to be worked on
1015 * right now, but take care to adjust the timer
1016 * properly.
1017 */
1018 run_again(local, wk->timeout);
1019 continue;
1020 }
1021
1022 switch (wk->type) {
1023 default:
1024 WARN_ON(1);
1025 /* nothing */
1026 rma = WORK_ACT_NONE;
1027 break;
1028 case IEEE80211_WORK_ABORT:
1029 rma = WORK_ACT_TIMEOUT;
1030 break;
1031 case IEEE80211_WORK_DIRECT_PROBE:
1032 rma = ieee80211_direct_probe(wk);
1033 break;
1034 case IEEE80211_WORK_AUTH:
1035 rma = ieee80211_authenticate(wk);
1036 break;
1037 case IEEE80211_WORK_ASSOC:
1038 rma = ieee80211_associate(wk);
1039 break;
1040 case IEEE80211_WORK_REMAIN_ON_CHANNEL:
1041 rma = ieee80211_remain_on_channel_timeout(wk);
1042 break;
1043 case IEEE80211_WORK_OFFCHANNEL_TX:
1044 rma = ieee80211_offchannel_tx(wk);
1045 break;
1046 case IEEE80211_WORK_ASSOC_BEACON_WAIT:
1047 rma = ieee80211_assoc_beacon_wait(wk);
1048 break;
1049 }
1050
1051 wk->started = started;
1052
1053 switch (rma) {
1054 case WORK_ACT_NONE:
1055 /* might have changed the timeout */
1056 run_again(local, wk->timeout);
1057 break;
1058 case WORK_ACT_TIMEOUT:
1059 list_del_rcu(&wk->list);
1060 synchronize_rcu();
1061 list_add(&wk->list, &free_work);
1062 break;
1063 default:
1064 WARN(1, "unexpected: %d", rma);
1065 }
1066 }
1067
1068 list_for_each_entry(wk, &local->work_list, list) {
1069 if (!wk->started)
1070 continue;
1071 if (wk->chan != local->tmp_channel)
1072 continue;
1073 if (ieee80211_work_ct_coexists(wk->chan_type,
1074 local->tmp_channel_type))
1075 continue;
1076 remain_off_channel = true;
1077 }
1078
1079 if (!remain_off_channel && local->tmp_channel) {
1080 bool on_oper_chan = ieee80211_cfg_on_oper_channel(local);
1081 local->tmp_channel = NULL;
1082 /* If tmp_channel wasn't operating channel, then
1083 * we need to go back on-channel.
1084 * NOTE: If we can ever be here while scannning,
1085 * or if the hw_config() channel config logic changes,
1086 * then we may need to do a more thorough check to see if
1087 * we still need to do a hardware config. Currently,
1088 * we cannot be here while scanning, however.
1089 */
1090 if (ieee80211_cfg_on_oper_channel(local) && !on_oper_chan)
1091 ieee80211_hw_config(local, 0);
1092
1093 /* At the least, we need to disable offchannel_ps,
1094 * so just go ahead and run the entire offchannel
1095 * return logic here. We *could* skip enabling
1096 * beaconing if we were already on-oper-channel
1097 * as a future optimization.
1098 */
1099 ieee80211_offchannel_return(local, true, true);
1100
1101 /* give connection some time to breathe */
1102 run_again(local, jiffies + HZ/2);
1103 }
1104
1105 if (list_empty(&local->work_list) && local->scan_req &&
1106 !local->scanning)
1107 ieee80211_queue_delayed_work(&local->hw,
1108 &local->scan_work,
1109 round_jiffies_relative(0));
1110
1111 ieee80211_recalc_idle(local);
1112
1113 mutex_unlock(&local->mtx);
1114
1115 list_for_each_entry_safe(wk, tmp, &free_work, list) {
1116 wk->done(wk, NULL);
1117 list_del(&wk->list);
1118 kfree(wk);
1119 }
1120 }
1121
1122 void ieee80211_add_work(struct ieee80211_work *wk)
1123 {
1124 struct ieee80211_local *local;
1125
1126 if (WARN_ON(!wk->chan))
1127 return;
1128
1129 if (WARN_ON(!wk->sdata))
1130 return;
1131
1132 if (WARN_ON(!wk->done))
1133 return;
1134
1135 if (WARN_ON(!ieee80211_sdata_running(wk->sdata)))
1136 return;
1137
1138 wk->started = false;
1139
1140 local = wk->sdata->local;
1141 mutex_lock(&local->mtx);
1142 list_add_tail(&wk->list, &local->work_list);
1143 mutex_unlock(&local->mtx);
1144
1145 ieee80211_queue_work(&local->hw, &local->work_work);
1146 }
1147
1148 void ieee80211_work_init(struct ieee80211_local *local)
1149 {
1150 INIT_LIST_HEAD(&local->work_list);
1151 setup_timer(&local->work_timer, ieee80211_work_timer,
1152 (unsigned long)local);
1153 INIT_WORK(&local->work_work, ieee80211_work_work);
1154 skb_queue_head_init(&local->work_skb_queue);
1155 }
1156
1157 void ieee80211_work_purge(struct ieee80211_sub_if_data *sdata)
1158 {
1159 struct ieee80211_local *local = sdata->local;
1160 struct ieee80211_work *wk;
1161 bool cleanup = false;
1162
1163 mutex_lock(&local->mtx);
1164 list_for_each_entry(wk, &local->work_list, list) {
1165 if (wk->sdata != sdata)
1166 continue;
1167 cleanup = true;
1168 wk->type = IEEE80211_WORK_ABORT;
1169 wk->started = true;
1170 wk->timeout = jiffies;
1171 }
1172 mutex_unlock(&local->mtx);
1173
1174 /* run cleanups etc. */
1175 if (cleanup)
1176 ieee80211_work_work(&local->work_work);
1177
1178 mutex_lock(&local->mtx);
1179 list_for_each_entry(wk, &local->work_list, list) {
1180 if (wk->sdata != sdata)
1181 continue;
1182 WARN_ON(1);
1183 break;
1184 }
1185 mutex_unlock(&local->mtx);
1186 }
1187
1188 ieee80211_rx_result ieee80211_work_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1189 struct sk_buff *skb)
1190 {
1191 struct ieee80211_local *local = sdata->local;
1192 struct ieee80211_mgmt *mgmt;
1193 struct ieee80211_work *wk;
1194 u16 fc;
1195
1196 if (skb->len < 24)
1197 return RX_DROP_MONITOR;
1198
1199 mgmt = (struct ieee80211_mgmt *) skb->data;
1200 fc = le16_to_cpu(mgmt->frame_control);
1201
1202 list_for_each_entry_rcu(wk, &local->work_list, list) {
1203 if (sdata != wk->sdata)
1204 continue;
1205 if (compare_ether_addr(wk->filter_ta, mgmt->sa))
1206 continue;
1207 if (compare_ether_addr(wk->filter_ta, mgmt->bssid))
1208 continue;
1209
1210 switch (fc & IEEE80211_FCTL_STYPE) {
1211 case IEEE80211_STYPE_AUTH:
1212 case IEEE80211_STYPE_PROBE_RESP:
1213 case IEEE80211_STYPE_ASSOC_RESP:
1214 case IEEE80211_STYPE_REASSOC_RESP:
1215 case IEEE80211_STYPE_BEACON:
1216 skb_queue_tail(&local->work_skb_queue, skb);
1217 ieee80211_queue_work(&local->hw, &local->work_work);
1218 return RX_QUEUED;
1219 }
1220 }
1221
1222 return RX_CONTINUE;
1223 }
1224
1225 static enum work_done_result ieee80211_remain_done(struct ieee80211_work *wk,
1226 struct sk_buff *skb)
1227 {
1228 /*
1229 * We are done serving the remain-on-channel command.
1230 */
1231 cfg80211_remain_on_channel_expired(wk->sdata->dev, (unsigned long) wk,
1232 wk->chan, wk->chan_type,
1233 GFP_KERNEL);
1234
1235 return WORK_DONE_DESTROY;
1236 }
1237
1238 int ieee80211_wk_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1239 struct ieee80211_channel *chan,
1240 enum nl80211_channel_type channel_type,
1241 unsigned int duration, u64 *cookie)
1242 {
1243 struct ieee80211_work *wk;
1244
1245 wk = kzalloc(sizeof(*wk), GFP_KERNEL);
1246 if (!wk)
1247 return -ENOMEM;
1248
1249 wk->type = IEEE80211_WORK_REMAIN_ON_CHANNEL;
1250 wk->chan = chan;
1251 wk->chan_type = channel_type;
1252 wk->sdata = sdata;
1253 wk->done = ieee80211_remain_done;
1254
1255 wk->remain.duration = duration;
1256
1257 *cookie = (unsigned long) wk;
1258
1259 ieee80211_add_work(wk);
1260
1261 return 0;
1262 }
1263
1264 int ieee80211_wk_cancel_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1265 u64 cookie)
1266 {
1267 struct ieee80211_local *local = sdata->local;
1268 struct ieee80211_work *wk, *tmp;
1269 bool found = false;
1270
1271 mutex_lock(&local->mtx);
1272 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
1273 if ((unsigned long) wk == cookie) {
1274 wk->timeout = jiffies;
1275 found = true;
1276 break;
1277 }
1278 }
1279 mutex_unlock(&local->mtx);
1280
1281 if (!found)
1282 return -ENOENT;
1283
1284 ieee80211_queue_work(&local->hw, &local->work_work);
1285
1286 return 0;
1287 }
Linux 2.6 libata-dev (mirror)