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mac80211: remove struct ieee80211_if_init_conf
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / work.c
blob0bffb6a42534202b0ae9ce16523e430f92d47b78
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 /*
545 * First time we run, do nothing -- the generic code will
546 * have switched to the right channel etc.
547 */
548 if (!wk->remain.started) {
549 wk->remain.started = true;
550 wk->timeout = jiffies + msecs_to_jiffies(wk->remain.duration);
551
552 cfg80211_ready_on_channel(wk->sdata->dev, (u64)wk, wk->chan,
553 wk->chan_type, wk->remain.duration,
554 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 /* mark work as started if it's on the current off-channel */
835 if (!wk->started && local->tmp_channel &&
836 wk->chan == local->tmp_channel &&
837 wk->chan_type == local->tmp_channel_type) {
838 wk->started = true;
839 }
840
841 if (!wk->started && !local->tmp_channel) {
842 /*
843 * TODO: could optimize this by leaving the
844 * station vifs in awake mode if they
845 * happen to be on the same channel as
846 * the requested channel
847 */
848 ieee80211_offchannel_stop_beaconing(local);
849 ieee80211_offchannel_stop_station(local);
850
851 local->tmp_channel = wk->chan;
852 local->tmp_channel_type = wk->chan_type;
853 ieee80211_hw_config(local, 0);
854 wk->started = true;
855 wk->timeout = jiffies;
856 }
857
858 /* don't try to work with items that aren't started */
859 if (!wk->started)
860 continue;
861
862 if (time_is_after_jiffies(wk->timeout)) {
863 /*
864 * This work item isn't supposed to be worked on
865 * right now, but take care to adjust the timer
866 * properly.
867 */
868 run_again(local, wk->timeout);
869 continue;
870 }
871
872 switch (wk->type) {
873 default:
874 WARN_ON(1);
875 /* nothing */
876 rma = WORK_ACT_NONE;
877 break;
878 case IEEE80211_WORK_ABORT:
879 rma = WORK_ACT_TIMEOUT;
880 case IEEE80211_WORK_DIRECT_PROBE:
881 rma = ieee80211_direct_probe(wk);
882 break;
883 case IEEE80211_WORK_AUTH:
884 rma = ieee80211_authenticate(wk);
885 break;
886 case IEEE80211_WORK_ASSOC:
887 rma = ieee80211_associate(wk);
888 break;
889 case IEEE80211_WORK_REMAIN_ON_CHANNEL:
890 rma = ieee80211_remain_on_channel_timeout(wk);
891 break;
892 }
893
894 switch (rma) {
895 case WORK_ACT_NONE:
896 /* might have changed the timeout */
897 run_again(local, wk->timeout);
898 break;
899 case WORK_ACT_TIMEOUT:
900 list_del_rcu(&wk->list);
901 synchronize_rcu();
902 list_add(&wk->list, &free_work);
903 break;
904 default:
905 WARN(1, "unexpected: %d", rma);
906 }
907 }
908
909 list_for_each_entry(wk, &local->work_list, list) {
910 if (!wk->started)
911 continue;
912 if (wk->chan != local->tmp_channel)
913 continue;
914 if (wk->chan_type != local->tmp_channel_type)
915 continue;
916 remain_off_channel = true;
917 }
918
919 if (!remain_off_channel && local->tmp_channel) {
920 local->tmp_channel = NULL;
921 ieee80211_hw_config(local, 0);
922 ieee80211_offchannel_return(local, true);
923 /* give connection some time to breathe */
924 run_again(local, jiffies + HZ/2);
925 }
926
927 if (list_empty(&local->work_list) && local->scan_req)
928 ieee80211_queue_delayed_work(&local->hw,
929 &local->scan_work,
930 round_jiffies_relative(0));
931
932 mutex_unlock(&local->work_mtx);
933
934 ieee80211_recalc_idle(local);
935
936 list_for_each_entry_safe(wk, tmp, &free_work, list) {
937 wk->done(wk, NULL);
938 list_del(&wk->list);
939 kfree(wk);
940 }
941 }
942
943 void ieee80211_add_work(struct ieee80211_work *wk)
944 {
945 struct ieee80211_local *local;
946
947 if (WARN_ON(!wk->chan))
948 return;
949
950 if (WARN_ON(!wk->sdata))
951 return;
952
953 if (WARN_ON(!wk->done))
954 return;
955
956 wk->started = false;
957
958 local = wk->sdata->local;
959 mutex_lock(&local->work_mtx);
960 list_add_tail(&wk->list, &local->work_list);
961 mutex_unlock(&local->work_mtx);
962
963 ieee80211_queue_work(&local->hw, &local->work_work);
964 }
965
966 void ieee80211_work_init(struct ieee80211_local *local)
967 {
968 mutex_init(&local->work_mtx);
969 INIT_LIST_HEAD(&local->work_list);
970 setup_timer(&local->work_timer, ieee80211_work_timer,
971 (unsigned long)local);
972 INIT_WORK(&local->work_work, ieee80211_work_work);
973 skb_queue_head_init(&local->work_skb_queue);
974 }
975
976 void ieee80211_work_purge(struct ieee80211_sub_if_data *sdata)
977 {
978 struct ieee80211_local *local = sdata->local;
979 struct ieee80211_work *wk;
980
981 mutex_lock(&local->work_mtx);
982 list_for_each_entry(wk, &local->work_list, list) {
983 if (wk->sdata != sdata)
984 continue;
985 wk->type = IEEE80211_WORK_ABORT;
986 wk->started = true;
987 wk->timeout = jiffies;
988 }
989 mutex_unlock(&local->work_mtx);
990
991 /* run cleanups etc. */
992 ieee80211_work_work(&local->work_work);
993
994 mutex_lock(&local->work_mtx);
995 list_for_each_entry(wk, &local->work_list, list) {
996 if (wk->sdata != sdata)
997 continue;
998 WARN_ON(1);
999 break;
1000 }
1001 mutex_unlock(&local->work_mtx);
1002 }
1003
1004 ieee80211_rx_result ieee80211_work_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1005 struct sk_buff *skb)
1006 {
1007 struct ieee80211_local *local = sdata->local;
1008 struct ieee80211_mgmt *mgmt;
1009 struct ieee80211_work *wk;
1010 u16 fc;
1011
1012 if (skb->len < 24)
1013 return RX_DROP_MONITOR;
1014
1015 mgmt = (struct ieee80211_mgmt *) skb->data;
1016 fc = le16_to_cpu(mgmt->frame_control);
1017
1018 list_for_each_entry_rcu(wk, &local->work_list, list) {
1019 if (sdata != wk->sdata)
1020 continue;
1021 if (compare_ether_addr(wk->filter_ta, mgmt->sa))
1022 continue;
1023 if (compare_ether_addr(wk->filter_ta, mgmt->bssid))
1024 continue;
1025
1026 switch (fc & IEEE80211_FCTL_STYPE) {
1027 case IEEE80211_STYPE_AUTH:
1028 case IEEE80211_STYPE_PROBE_RESP:
1029 case IEEE80211_STYPE_ASSOC_RESP:
1030 case IEEE80211_STYPE_REASSOC_RESP:
1031 case IEEE80211_STYPE_DEAUTH:
1032 case IEEE80211_STYPE_DISASSOC:
1033 skb_queue_tail(&local->work_skb_queue, skb);
1034 ieee80211_queue_work(&local->hw, &local->work_work);
1035 return RX_QUEUED;
1036 }
1037 }
1038
1039 return RX_CONTINUE;
1040 }
1041
1042 static enum work_done_result ieee80211_remain_done(struct ieee80211_work *wk,
1043 struct sk_buff *skb)
1044 {
1045 /*
1046 * We are done serving the remain-on-channel command.
1047 */
1048 cfg80211_remain_on_channel_expired(wk->sdata->dev, (u64)wk,
1049 wk->chan, wk->chan_type,
1050 GFP_KERNEL);
1051
1052 return WORK_DONE_DESTROY;
1053 }
1054
1055 int ieee80211_wk_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1056 struct ieee80211_channel *chan,
1057 enum nl80211_channel_type channel_type,
1058 unsigned int duration, u64 *cookie)
1059 {
1060 struct ieee80211_work *wk;
1061
1062 wk = kzalloc(sizeof(*wk), GFP_KERNEL);
1063 if (!wk)
1064 return -ENOMEM;
1065
1066 wk->type = IEEE80211_WORK_REMAIN_ON_CHANNEL;
1067 wk->chan = chan;
1068 wk->chan_type = channel_type;
1069 wk->sdata = sdata;
1070 wk->done = ieee80211_remain_done;
1071
1072 wk->remain.duration = duration;
1073
1074 *cookie = (u64)wk;
1075
1076 ieee80211_add_work(wk);
1077
1078 return 0;
1079 }
1080
1081 int ieee80211_wk_cancel_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1082 u64 cookie)
1083 {
1084 struct ieee80211_local *local = sdata->local;
1085 struct ieee80211_work *wk, *tmp;
1086 bool found = false;
1087
1088 mutex_lock(&local->work_mtx);
1089 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
1090 if ((u64)wk == cookie) {
1091 wk->timeout = jiffies;
1092 found = true;
1093 break;
1094 }
1095 }
1096 mutex_unlock(&local->work_mtx);
1097
1098 if (!found)
1099 return -ENOENT;
1100
1101 ieee80211_queue_work(&local->hw, &local->work_work);
1102
1103 return 0;
1104 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree