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iwl3945: enable stuck queue detection on 3945
[linux/fpc-iii.git] / net / mac80211 / work.c
blob949c2d119c7bcc196bc19adff25c22f1380a7ca9
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 #define IEEE80211_MAX_PROBE_TRIES 5
34
35 enum work_action {
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 WARN_ON(!mutex_is_locked(&local->work_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 if (ieee80211_disable_40mhz_24ghz &&
129 sband->band == IEEE80211_BAND_2GHZ) {
130 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
131 cap &= ~IEEE80211_HT_CAP_SGI_40;
132 }
133
134 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
135 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
136 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
137 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
138 cap &= ~IEEE80211_HT_CAP_SGI_40;
139 }
140 break;
141 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
142 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
143 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
144 cap &= ~IEEE80211_HT_CAP_SGI_40;
145 }
146 break;
147 }
148
149 /* set SM PS mode properly */
150 cap &= ~IEEE80211_HT_CAP_SM_PS;
151 switch (smps) {
152 case IEEE80211_SMPS_AUTOMATIC:
153 case IEEE80211_SMPS_NUM_MODES:
154 WARN_ON(1);
155 case IEEE80211_SMPS_OFF:
156 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
157 IEEE80211_HT_CAP_SM_PS_SHIFT;
158 break;
159 case IEEE80211_SMPS_STATIC:
160 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
161 IEEE80211_HT_CAP_SM_PS_SHIFT;
162 break;
163 case IEEE80211_SMPS_DYNAMIC:
164 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
165 IEEE80211_HT_CAP_SM_PS_SHIFT;
166 break;
167 }
168
169 /* reserve and fill IE */
170
171 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
172 *pos++ = WLAN_EID_HT_CAPABILITY;
173 *pos++ = sizeof(struct ieee80211_ht_cap);
174 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
175
176 /* capability flags */
177 tmp = cpu_to_le16(cap);
178 memcpy(pos, &tmp, sizeof(u16));
179 pos += sizeof(u16);
180
181 /* AMPDU parameters */
182 *pos++ = sband->ht_cap.ampdu_factor |
183 (sband->ht_cap.ampdu_density <<
184 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
185
186 /* MCS set */
187 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
188 pos += sizeof(sband->ht_cap.mcs);
189
190 /* extended capabilities */
191 pos += sizeof(__le16);
192
193 /* BF capabilities */
194 pos += sizeof(__le32);
195
196 /* antenna selection */
197 pos += sizeof(u8);
198 }
199
200 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
201 struct ieee80211_work *wk)
202 {
203 struct ieee80211_local *local = sdata->local;
204 struct sk_buff *skb;
205 struct ieee80211_mgmt *mgmt;
206 u8 *pos, qos_info;
207 const u8 *ies;
208 size_t offset = 0, noffset;
209 int i, len, count, rates_len, supp_rates_len;
210 u16 capab;
211 struct ieee80211_supported_band *sband;
212 u32 rates = 0;
213
214 sband = local->hw.wiphy->bands[wk->chan->band];
215
216 if (wk->assoc.supp_rates_len) {
217 /*
218 * Get all rates supported by the device and the AP as
219 * some APs don't like getting a superset of their rates
220 * in the association request (e.g. D-Link DAP 1353 in
221 * b-only mode)...
222 */
223 rates_len = ieee80211_compatible_rates(wk->assoc.supp_rates,
224 wk->assoc.supp_rates_len,
225 sband, &rates);
226 } else {
227 /*
228 * In case AP not provide any supported rates information
229 * before association, we send information element(s) with
230 * all rates that we support.
231 */
232 rates = ~0;
233 rates_len = sband->n_bitrates;
234 }
235
236 skb = alloc_skb(local->hw.extra_tx_headroom +
237 sizeof(*mgmt) + /* bit too much but doesn't matter */
238 2 + wk->assoc.ssid_len + /* SSID */
239 4 + rates_len + /* (extended) rates */
240 4 + /* power capability */
241 2 + 2 * sband->n_channels + /* supported channels */
242 2 + sizeof(struct ieee80211_ht_cap) + /* HT */
243 wk->ie_len + /* extra IEs */
244 9, /* WMM */
245 GFP_KERNEL);
246 if (!skb) {
247 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
248 "frame\n", sdata->name);
249 return;
250 }
251 skb_reserve(skb, local->hw.extra_tx_headroom);
252
253 capab = WLAN_CAPABILITY_ESS;
254
255 if (sband->band == IEEE80211_BAND_2GHZ) {
256 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
257 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
258 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
259 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
260 }
261
262 if (wk->assoc.capability & WLAN_CAPABILITY_PRIVACY)
263 capab |= WLAN_CAPABILITY_PRIVACY;
264
265 if ((wk->assoc.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
266 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
267 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
268
269 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
270 memset(mgmt, 0, 24);
271 memcpy(mgmt->da, wk->filter_ta, ETH_ALEN);
272 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
273 memcpy(mgmt->bssid, wk->filter_ta, ETH_ALEN);
274
275 if (!is_zero_ether_addr(wk->assoc.prev_bssid)) {
276 skb_put(skb, 10);
277 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
278 IEEE80211_STYPE_REASSOC_REQ);
279 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
280 mgmt->u.reassoc_req.listen_interval =
281 cpu_to_le16(local->hw.conf.listen_interval);
282 memcpy(mgmt->u.reassoc_req.current_ap, wk->assoc.prev_bssid,
283 ETH_ALEN);
284 } else {
285 skb_put(skb, 4);
286 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
287 IEEE80211_STYPE_ASSOC_REQ);
288 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
289 mgmt->u.assoc_req.listen_interval =
290 cpu_to_le16(local->hw.conf.listen_interval);
291 }
292
293 /* SSID */
294 ies = pos = skb_put(skb, 2 + wk->assoc.ssid_len);
295 *pos++ = WLAN_EID_SSID;
296 *pos++ = wk->assoc.ssid_len;
297 memcpy(pos, wk->assoc.ssid, wk->assoc.ssid_len);
298
299 /* add all rates which were marked to be used above */
300 supp_rates_len = rates_len;
301 if (supp_rates_len > 8)
302 supp_rates_len = 8;
303
304 len = sband->n_bitrates;
305 pos = skb_put(skb, supp_rates_len + 2);
306 *pos++ = WLAN_EID_SUPP_RATES;
307 *pos++ = supp_rates_len;
308
309 count = 0;
310 for (i = 0; i < sband->n_bitrates; i++) {
311 if (BIT(i) & rates) {
312 int rate = sband->bitrates[i].bitrate;
313 *pos++ = (u8) (rate / 5);
314 if (++count == 8)
315 break;
316 }
317 }
318
319 if (rates_len > count) {
320 pos = skb_put(skb, rates_len - count + 2);
321 *pos++ = WLAN_EID_EXT_SUPP_RATES;
322 *pos++ = rates_len - count;
323
324 for (i++; i < sband->n_bitrates; i++) {
325 if (BIT(i) & rates) {
326 int rate = sband->bitrates[i].bitrate;
327 *pos++ = (u8) (rate / 5);
328 }
329 }
330 }
331
332 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
333 /* 1. power capabilities */
334 pos = skb_put(skb, 4);
335 *pos++ = WLAN_EID_PWR_CAPABILITY;
336 *pos++ = 2;
337 *pos++ = 0; /* min tx power */
338 *pos++ = wk->chan->max_power; /* max tx power */
339
340 /* 2. supported channels */
341 /* TODO: get this in reg domain format */
342 pos = skb_put(skb, 2 * sband->n_channels + 2);
343 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
344 *pos++ = 2 * sband->n_channels;
345 for (i = 0; i < sband->n_channels; i++) {
346 *pos++ = ieee80211_frequency_to_channel(
347 sband->channels[i].center_freq);
348 *pos++ = 1; /* one channel in the subband*/
349 }
350 }
351
352 /* if present, add any custom IEs that go before HT */
353 if (wk->ie_len && wk->ie) {
354 static const u8 before_ht[] = {
355 WLAN_EID_SSID,
356 WLAN_EID_SUPP_RATES,
357 WLAN_EID_EXT_SUPP_RATES,
358 WLAN_EID_PWR_CAPABILITY,
359 WLAN_EID_SUPPORTED_CHANNELS,
360 WLAN_EID_RSN,
361 WLAN_EID_QOS_CAPA,
362 WLAN_EID_RRM_ENABLED_CAPABILITIES,
363 WLAN_EID_MOBILITY_DOMAIN,
364 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
365 };
366 noffset = ieee80211_ie_split(wk->ie, wk->ie_len,
367 before_ht, ARRAY_SIZE(before_ht),
368 offset);
369 pos = skb_put(skb, noffset - offset);
370 memcpy(pos, wk->ie + offset, noffset - offset);
371 offset = noffset;
372 }
373
374 if (wk->assoc.use_11n && wk->assoc.wmm_used &&
375 local->hw.queues >= 4)
376 ieee80211_add_ht_ie(skb, wk->assoc.ht_information_ie,
377 sband, wk->chan, wk->assoc.smps);
378
379 /* if present, add any custom non-vendor IEs that go after HT */
380 if (wk->ie_len && wk->ie) {
381 noffset = ieee80211_ie_split_vendor(wk->ie, wk->ie_len,
382 offset);
383 pos = skb_put(skb, noffset - offset);
384 memcpy(pos, wk->ie + offset, noffset - offset);
385 offset = noffset;
386 }
387
388 if (wk->assoc.wmm_used && local->hw.queues >= 4) {
389 if (wk->assoc.uapsd_used) {
390 qos_info = local->uapsd_queues;
391 qos_info |= (local->uapsd_max_sp_len <<
392 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
393 } else {
394 qos_info = 0;
395 }
396
397 pos = skb_put(skb, 9);
398 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
399 *pos++ = 7; /* len */
400 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
401 *pos++ = 0x50;
402 *pos++ = 0xf2;
403 *pos++ = 2; /* WME */
404 *pos++ = 0; /* WME info */
405 *pos++ = 1; /* WME ver */
406 *pos++ = qos_info;
407 }
408
409 /* add any remaining custom (i.e. vendor specific here) IEs */
410 if (wk->ie_len && wk->ie) {
411 noffset = wk->ie_len;
412 pos = skb_put(skb, noffset - offset);
413 memcpy(pos, wk->ie + offset, noffset - offset);
414 }
415
416 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
417 ieee80211_tx_skb(sdata, skb);
418 }
419
420 static void ieee80211_remove_auth_bss(struct ieee80211_local *local,
421 struct ieee80211_work *wk)
422 {
423 struct cfg80211_bss *cbss;
424 u16 capa_val = WLAN_CAPABILITY_ESS;
425
426 if (wk->probe_auth.privacy)
427 capa_val |= WLAN_CAPABILITY_PRIVACY;
428
429 cbss = cfg80211_get_bss(local->hw.wiphy, wk->chan, wk->filter_ta,
430 wk->probe_auth.ssid, wk->probe_auth.ssid_len,
431 WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
432 capa_val);
433 if (!cbss)
434 return;
435
436 cfg80211_unlink_bss(local->hw.wiphy, cbss);
437 cfg80211_put_bss(cbss);
438 }
439
440 static enum work_action __must_check
441 ieee80211_direct_probe(struct ieee80211_work *wk)
442 {
443 struct ieee80211_sub_if_data *sdata = wk->sdata;
444 struct ieee80211_local *local = sdata->local;
445
446 wk->probe_auth.tries++;
447 if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
448 printk(KERN_DEBUG "%s: direct probe to %pM timed out\n",
449 sdata->name, wk->filter_ta);
450
451 /*
452 * Most likely AP is not in the range so remove the
453 * bss struct for that AP.
454 */
455 ieee80211_remove_auth_bss(local, wk);
456
457 return WORK_ACT_TIMEOUT;
458 }
459
460 printk(KERN_DEBUG "%s: direct probe to %pM (try %d)\n",
461 sdata->name, wk->filter_ta, wk->probe_auth.tries);
462
463 /*
464 * Direct probe is sent to broadcast address as some APs
465 * will not answer to direct packet in unassociated state.
466 */
467 ieee80211_send_probe_req(sdata, NULL, wk->probe_auth.ssid,
468 wk->probe_auth.ssid_len, NULL, 0);
469
470 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
471 run_again(local, wk->timeout);
472
473 return WORK_ACT_NONE;
474 }
475
476
477 static enum work_action __must_check
478 ieee80211_authenticate(struct ieee80211_work *wk)
479 {
480 struct ieee80211_sub_if_data *sdata = wk->sdata;
481 struct ieee80211_local *local = sdata->local;
482
483 wk->probe_auth.tries++;
484 if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
485 printk(KERN_DEBUG "%s: authentication with %pM"
486 " timed out\n", sdata->name, wk->filter_ta);
487
488 /*
489 * Most likely AP is not in the range so remove the
490 * bss struct for that AP.
491 */
492 ieee80211_remove_auth_bss(local, wk);
493
494 return WORK_ACT_TIMEOUT;
495 }
496
497 printk(KERN_DEBUG "%s: authenticate with %pM (try %d)\n",
498 sdata->name, wk->filter_ta, wk->probe_auth.tries);
499
500 ieee80211_send_auth(sdata, 1, wk->probe_auth.algorithm, wk->ie,
501 wk->ie_len, wk->filter_ta, NULL, 0, 0);
502 wk->probe_auth.transaction = 2;
503
504 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
505 run_again(local, wk->timeout);
506
507 return WORK_ACT_NONE;
508 }
509
510 static enum work_action __must_check
511 ieee80211_associate(struct ieee80211_work *wk)
512 {
513 struct ieee80211_sub_if_data *sdata = wk->sdata;
514 struct ieee80211_local *local = sdata->local;
515
516 wk->assoc.tries++;
517 if (wk->assoc.tries > IEEE80211_ASSOC_MAX_TRIES) {
518 printk(KERN_DEBUG "%s: association with %pM"
519 " timed out\n",
520 sdata->name, wk->filter_ta);
521
522 /*
523 * Most likely AP is not in the range so remove the
524 * bss struct for that AP.
525 */
526 if (wk->assoc.bss)
527 cfg80211_unlink_bss(local->hw.wiphy, wk->assoc.bss);
528
529 return WORK_ACT_TIMEOUT;
530 }
531
532 printk(KERN_DEBUG "%s: associate with %pM (try %d)\n",
533 sdata->name, wk->filter_ta, wk->assoc.tries);
534 ieee80211_send_assoc(sdata, wk);
535
536 wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
537 run_again(local, wk->timeout);
538
539 return WORK_ACT_NONE;
540 }
541
542 static enum work_action __must_check
543 ieee80211_remain_on_channel_timeout(struct ieee80211_work *wk)
544 {
545 /*
546 * First time we run, do nothing -- the generic code will
547 * have switched to the right channel etc.
548 */
549 if (!wk->started) {
550 wk->timeout = jiffies + msecs_to_jiffies(wk->remain.duration);
551
552 cfg80211_ready_on_channel(wk->sdata->dev, (unsigned long) wk,
553 wk->chan, wk->chan_type,
554 wk->remain.duration, GFP_KERNEL);
555
556 return WORK_ACT_NONE;
557 }
558
559 return WORK_ACT_TIMEOUT;
560 }
561
562 static void ieee80211_auth_challenge(struct ieee80211_work *wk,
563 struct ieee80211_mgmt *mgmt,
564 size_t len)
565 {
566 struct ieee80211_sub_if_data *sdata = wk->sdata;
567 u8 *pos;
568 struct ieee802_11_elems elems;
569
570 pos = mgmt->u.auth.variable;
571 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
572 if (!elems.challenge)
573 return;
574 ieee80211_send_auth(sdata, 3, wk->probe_auth.algorithm,
575 elems.challenge - 2, elems.challenge_len + 2,
576 wk->filter_ta, wk->probe_auth.key,
577 wk->probe_auth.key_len, wk->probe_auth.key_idx);
578 wk->probe_auth.transaction = 4;
579 }
580
581 static enum work_action __must_check
582 ieee80211_rx_mgmt_auth(struct ieee80211_work *wk,
583 struct ieee80211_mgmt *mgmt, size_t len)
584 {
585 u16 auth_alg, auth_transaction, status_code;
586
587 if (wk->type != IEEE80211_WORK_AUTH)
588 return WORK_ACT_NONE;
589
590 if (len < 24 + 6)
591 return WORK_ACT_NONE;
592
593 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
594 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
595 status_code = le16_to_cpu(mgmt->u.auth.status_code);
596
597 if (auth_alg != wk->probe_auth.algorithm ||
598 auth_transaction != wk->probe_auth.transaction)
599 return WORK_ACT_NONE;
600
601 if (status_code != WLAN_STATUS_SUCCESS) {
602 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
603 wk->sdata->name, mgmt->sa, status_code);
604 return WORK_ACT_DONE;
605 }
606
607 switch (wk->probe_auth.algorithm) {
608 case WLAN_AUTH_OPEN:
609 case WLAN_AUTH_LEAP:
610 case WLAN_AUTH_FT:
611 break;
612 case WLAN_AUTH_SHARED_KEY:
613 if (wk->probe_auth.transaction != 4) {
614 ieee80211_auth_challenge(wk, mgmt, len);
615 /* need another frame */
616 return WORK_ACT_NONE;
617 }
618 break;
619 default:
620 WARN_ON(1);
621 return WORK_ACT_NONE;
622 }
623
624 printk(KERN_DEBUG "%s: authenticated\n", wk->sdata->name);
625 return WORK_ACT_DONE;
626 }
627
628 static enum work_action __must_check
629 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_work *wk,
630 struct ieee80211_mgmt *mgmt, size_t len,
631 bool reassoc)
632 {
633 struct ieee80211_sub_if_data *sdata = wk->sdata;
634 struct ieee80211_local *local = sdata->local;
635 u16 capab_info, status_code, aid;
636 struct ieee802_11_elems elems;
637 u8 *pos;
638
639 /*
640 * AssocResp and ReassocResp have identical structure, so process both
641 * of them in this function.
642 */
643
644 if (len < 24 + 6)
645 return WORK_ACT_NONE;
646
647 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
648 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
649 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
650
651 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
652 "status=%d aid=%d)\n",
653 sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
654 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
655
656 pos = mgmt->u.assoc_resp.variable;
657 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
658
659 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
660 elems.timeout_int && elems.timeout_int_len == 5 &&
661 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
662 u32 tu, ms;
663 tu = get_unaligned_le32(elems.timeout_int + 1);
664 ms = tu * 1024 / 1000;
665 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
666 "comeback duration %u TU (%u ms)\n",
667 sdata->name, mgmt->sa, tu, ms);
668 wk->timeout = jiffies + msecs_to_jiffies(ms);
669 if (ms > IEEE80211_ASSOC_TIMEOUT)
670 run_again(local, wk->timeout);
671 return WORK_ACT_NONE;
672 }
673
674 if (status_code != WLAN_STATUS_SUCCESS)
675 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
676 sdata->name, mgmt->sa, status_code);
677 else
678 printk(KERN_DEBUG "%s: associated\n", sdata->name);
679
680 return WORK_ACT_DONE;
681 }
682
683 static enum work_action __must_check
684 ieee80211_rx_mgmt_probe_resp(struct ieee80211_work *wk,
685 struct ieee80211_mgmt *mgmt, size_t len,
686 struct ieee80211_rx_status *rx_status)
687 {
688 struct ieee80211_sub_if_data *sdata = wk->sdata;
689 struct ieee80211_local *local = sdata->local;
690 size_t baselen;
691
692 ASSERT_WORK_MTX(local);
693
694 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
695 if (baselen > len)
696 return WORK_ACT_NONE;
697
698 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
699 return WORK_ACT_DONE;
700 }
701
702 static void ieee80211_work_rx_queued_mgmt(struct ieee80211_local *local,
703 struct sk_buff *skb)
704 {
705 struct ieee80211_rx_status *rx_status;
706 struct ieee80211_mgmt *mgmt;
707 struct ieee80211_work *wk;
708 enum work_action rma = WORK_ACT_NONE;
709 u16 fc;
710
711 rx_status = (struct ieee80211_rx_status *) skb->cb;
712 mgmt = (struct ieee80211_mgmt *) skb->data;
713 fc = le16_to_cpu(mgmt->frame_control);
714
715 mutex_lock(&local->work_mtx);
716
717 list_for_each_entry(wk, &local->work_list, list) {
718 const u8 *bssid = NULL;
719
720 switch (wk->type) {
721 case IEEE80211_WORK_DIRECT_PROBE:
722 case IEEE80211_WORK_AUTH:
723 case IEEE80211_WORK_ASSOC:
724 bssid = wk->filter_ta;
725 break;
726 default:
727 continue;
728 }
729
730 /*
731 * Before queuing, we already verified mgmt->sa,
732 * so this is needed just for matching.
733 */
734 if (compare_ether_addr(bssid, mgmt->bssid))
735 continue;
736
737 switch (fc & IEEE80211_FCTL_STYPE) {
738 case IEEE80211_STYPE_PROBE_RESP:
739 rma = ieee80211_rx_mgmt_probe_resp(wk, mgmt, skb->len,
740 rx_status);
741 break;
742 case IEEE80211_STYPE_AUTH:
743 rma = ieee80211_rx_mgmt_auth(wk, mgmt, skb->len);
744 break;
745 case IEEE80211_STYPE_ASSOC_RESP:
746 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
747 skb->len, false);
748 break;
749 case IEEE80211_STYPE_REASSOC_RESP:
750 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
751 skb->len, true);
752 break;
753 default:
754 WARN_ON(1);
755 }
756 /*
757 * We've processed this frame for that work, so it can't
758 * belong to another work struct.
759 * NB: this is also required for correctness for 'rma'!
760 */
761 break;
762 }
763
764 switch (rma) {
765 case WORK_ACT_NONE:
766 break;
767 case WORK_ACT_DONE:
768 list_del_rcu(&wk->list);
769 break;
770 default:
771 WARN(1, "unexpected: %d", rma);
772 }
773
774 mutex_unlock(&local->work_mtx);
775
776 if (rma != WORK_ACT_DONE)
777 goto out;
778
779 switch (wk->done(wk, skb)) {
780 case WORK_DONE_DESTROY:
781 free_work(wk);
782 break;
783 case WORK_DONE_REQUEUE:
784 synchronize_rcu();
785 wk->started = false; /* restart */
786 mutex_lock(&local->work_mtx);
787 list_add_tail(&wk->list, &local->work_list);
788 mutex_unlock(&local->work_mtx);
789 }
790
791 out:
792 kfree_skb(skb);
793 }
794
795 static void ieee80211_work_timer(unsigned long data)
796 {
797 struct ieee80211_local *local = (void *) data;
798
799 if (local->quiescing)
800 return;
801
802 ieee80211_queue_work(&local->hw, &local->work_work);
803 }
804
805 static void ieee80211_work_work(struct work_struct *work)
806 {
807 struct ieee80211_local *local =
808 container_of(work, struct ieee80211_local, work_work);
809 struct sk_buff *skb;
810 struct ieee80211_work *wk, *tmp;
811 LIST_HEAD(free_work);
812 enum work_action rma;
813 bool remain_off_channel = false;
814
815 if (local->scanning)
816 return;
817
818 /*
819 * ieee80211_queue_work() should have picked up most cases,
820 * here we'll pick the the rest.
821 */
822 if (WARN(local->suspended, "work scheduled while going to suspend\n"))
823 return;
824
825 /* first process frames to avoid timing out while a frame is pending */
826 while ((skb = skb_dequeue(&local->work_skb_queue)))
827 ieee80211_work_rx_queued_mgmt(local, skb);
828
829 ieee80211_recalc_idle(local);
830
831 mutex_lock(&local->work_mtx);
832
833 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
834 bool started = wk->started;
835
836 /* mark work as started if it's on the current off-channel */
837 if (!started && local->tmp_channel &&
838 wk->chan == local->tmp_channel &&
839 wk->chan_type == local->tmp_channel_type) {
840 started = true;
841 wk->timeout = jiffies;
842 }
843
844 if (!started && !local->tmp_channel) {
845 /*
846 * TODO: could optimize this by leaving the
847 * station vifs in awake mode if they
848 * happen to be on the same channel as
849 * the requested channel
850 */
851 ieee80211_offchannel_stop_beaconing(local);
852 ieee80211_offchannel_stop_station(local);
853
854 local->tmp_channel = wk->chan;
855 local->tmp_channel_type = wk->chan_type;
856 ieee80211_hw_config(local, 0);
857 started = true;
858 wk->timeout = jiffies;
859 }
860
861 /* don't try to work with items that aren't started */
862 if (!started)
863 continue;
864
865 if (time_is_after_jiffies(wk->timeout)) {
866 /*
867 * This work item isn't supposed to be worked on
868 * right now, but take care to adjust the timer
869 * properly.
870 */
871 run_again(local, wk->timeout);
872 continue;
873 }
874
875 switch (wk->type) {
876 default:
877 WARN_ON(1);
878 /* nothing */
879 rma = WORK_ACT_NONE;
880 break;
881 case IEEE80211_WORK_ABORT:
882 rma = WORK_ACT_TIMEOUT;
883 break;
884 case IEEE80211_WORK_DIRECT_PROBE:
885 rma = ieee80211_direct_probe(wk);
886 break;
887 case IEEE80211_WORK_AUTH:
888 rma = ieee80211_authenticate(wk);
889 break;
890 case IEEE80211_WORK_ASSOC:
891 rma = ieee80211_associate(wk);
892 break;
893 case IEEE80211_WORK_REMAIN_ON_CHANNEL:
894 rma = ieee80211_remain_on_channel_timeout(wk);
895 break;
896 }
897
898 wk->started = started;
899
900 switch (rma) {
901 case WORK_ACT_NONE:
902 /* might have changed the timeout */
903 run_again(local, wk->timeout);
904 break;
905 case WORK_ACT_TIMEOUT:
906 list_del_rcu(&wk->list);
907 synchronize_rcu();
908 list_add(&wk->list, &free_work);
909 break;
910 default:
911 WARN(1, "unexpected: %d", rma);
912 }
913 }
914
915 list_for_each_entry(wk, &local->work_list, list) {
916 if (!wk->started)
917 continue;
918 if (wk->chan != local->tmp_channel)
919 continue;
920 if (wk->chan_type != local->tmp_channel_type)
921 continue;
922 remain_off_channel = true;
923 }
924
925 if (!remain_off_channel && local->tmp_channel) {
926 local->tmp_channel = NULL;
927 ieee80211_hw_config(local, 0);
928 ieee80211_offchannel_return(local, true);
929 /* give connection some time to breathe */
930 run_again(local, jiffies + HZ/2);
931 }
932
933 if (list_empty(&local->work_list) && local->scan_req)
934 ieee80211_queue_delayed_work(&local->hw,
935 &local->scan_work,
936 round_jiffies_relative(0));
937
938 mutex_unlock(&local->work_mtx);
939
940 ieee80211_recalc_idle(local);
941
942 list_for_each_entry_safe(wk, tmp, &free_work, list) {
943 wk->done(wk, NULL);
944 list_del(&wk->list);
945 kfree(wk);
946 }
947 }
948
949 void ieee80211_add_work(struct ieee80211_work *wk)
950 {
951 struct ieee80211_local *local;
952
953 if (WARN_ON(!wk->chan))
954 return;
955
956 if (WARN_ON(!wk->sdata))
957 return;
958
959 if (WARN_ON(!wk->done))
960 return;
961
962 if (WARN_ON(!ieee80211_sdata_running(wk->sdata)))
963 return;
964
965 wk->started = false;
966
967 local = wk->sdata->local;
968 mutex_lock(&local->work_mtx);
969 list_add_tail(&wk->list, &local->work_list);
970 mutex_unlock(&local->work_mtx);
971
972 ieee80211_queue_work(&local->hw, &local->work_work);
973 }
974
975 void ieee80211_work_init(struct ieee80211_local *local)
976 {
977 mutex_init(&local->work_mtx);
978 INIT_LIST_HEAD(&local->work_list);
979 setup_timer(&local->work_timer, ieee80211_work_timer,
980 (unsigned long)local);
981 INIT_WORK(&local->work_work, ieee80211_work_work);
982 skb_queue_head_init(&local->work_skb_queue);
983 }
984
985 void ieee80211_work_purge(struct ieee80211_sub_if_data *sdata)
986 {
987 struct ieee80211_local *local = sdata->local;
988 struct ieee80211_work *wk;
989
990 mutex_lock(&local->work_mtx);
991 list_for_each_entry(wk, &local->work_list, list) {
992 if (wk->sdata != sdata)
993 continue;
994 wk->type = IEEE80211_WORK_ABORT;
995 wk->started = true;
996 wk->timeout = jiffies;
997 }
998 mutex_unlock(&local->work_mtx);
999
1000 /* run cleanups etc. */
1001 ieee80211_work_work(&local->work_work);
1002
1003 mutex_lock(&local->work_mtx);
1004 list_for_each_entry(wk, &local->work_list, list) {
1005 if (wk->sdata != sdata)
1006 continue;
1007 WARN_ON(1);
1008 break;
1009 }
1010 mutex_unlock(&local->work_mtx);
1011 }
1012
1013 ieee80211_rx_result ieee80211_work_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1014 struct sk_buff *skb)
1015 {
1016 struct ieee80211_local *local = sdata->local;
1017 struct ieee80211_mgmt *mgmt;
1018 struct ieee80211_work *wk;
1019 u16 fc;
1020
1021 if (skb->len < 24)
1022 return RX_DROP_MONITOR;
1023
1024 mgmt = (struct ieee80211_mgmt *) skb->data;
1025 fc = le16_to_cpu(mgmt->frame_control);
1026
1027 list_for_each_entry_rcu(wk, &local->work_list, list) {
1028 if (sdata != wk->sdata)
1029 continue;
1030 if (compare_ether_addr(wk->filter_ta, mgmt->sa))
1031 continue;
1032 if (compare_ether_addr(wk->filter_ta, mgmt->bssid))
1033 continue;
1034
1035 switch (fc & IEEE80211_FCTL_STYPE) {
1036 case IEEE80211_STYPE_AUTH:
1037 case IEEE80211_STYPE_PROBE_RESP:
1038 case IEEE80211_STYPE_ASSOC_RESP:
1039 case IEEE80211_STYPE_REASSOC_RESP:
1040 skb_queue_tail(&local->work_skb_queue, skb);
1041 ieee80211_queue_work(&local->hw, &local->work_work);
1042 return RX_QUEUED;
1043 }
1044 }
1045
1046 return RX_CONTINUE;
1047 }
1048
1049 static enum work_done_result ieee80211_remain_done(struct ieee80211_work *wk,
1050 struct sk_buff *skb)
1051 {
1052 /*
1053 * We are done serving the remain-on-channel command.
1054 */
1055 cfg80211_remain_on_channel_expired(wk->sdata->dev, (unsigned long) wk,
1056 wk->chan, wk->chan_type,
1057 GFP_KERNEL);
1058
1059 return WORK_DONE_DESTROY;
1060 }
1061
1062 int ieee80211_wk_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1063 struct ieee80211_channel *chan,
1064 enum nl80211_channel_type channel_type,
1065 unsigned int duration, u64 *cookie)
1066 {
1067 struct ieee80211_work *wk;
1068
1069 wk = kzalloc(sizeof(*wk), GFP_KERNEL);
1070 if (!wk)
1071 return -ENOMEM;
1072
1073 wk->type = IEEE80211_WORK_REMAIN_ON_CHANNEL;
1074 wk->chan = chan;
1075 wk->chan_type = channel_type;
1076 wk->sdata = sdata;
1077 wk->done = ieee80211_remain_done;
1078
1079 wk->remain.duration = duration;
1080
1081 *cookie = (unsigned long) wk;
1082
1083 ieee80211_add_work(wk);
1084
1085 return 0;
1086 }
1087
1088 int ieee80211_wk_cancel_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1089 u64 cookie)
1090 {
1091 struct ieee80211_local *local = sdata->local;
1092 struct ieee80211_work *wk, *tmp;
1093 bool found = false;
1094
1095 mutex_lock(&local->work_mtx);
1096 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
1097 if ((unsigned long) wk == cookie) {
1098 wk->timeout = jiffies;
1099 found = true;
1100 break;
1101 }
1102 }
1103 mutex_unlock(&local->work_mtx);
1104
1105 if (!found)
1106 return -ENOENT;
1107
1108 ieee80211_queue_work(&local->hw, &local->work_work);
1109
1110 return 0;
1111 }
Linux with added FPC-III support