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mac80211: split up and insert custom IEs correctly
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / work.c
blobaffdd10b67ad68e08220aa01a0cff962b56545f3
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,
521 &wk->assoc.bss->cbss);
522
523 /*
524 * We might have a pending scan which had no chance to run yet
525 * due to work needing to be done. Hence, queue the STAs work
526 * again for that.
527 */
528 ieee80211_queue_work(&local->hw, &local->work_work);
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 void ieee80211_auth_challenge(struct ieee80211_work *wk,
543 struct ieee80211_mgmt *mgmt,
544 size_t len)
545 {
546 struct ieee80211_sub_if_data *sdata = wk->sdata;
547 u8 *pos;
548 struct ieee802_11_elems elems;
549
550 pos = mgmt->u.auth.variable;
551 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
552 if (!elems.challenge)
553 return;
554 ieee80211_send_auth(sdata, 3, wk->probe_auth.algorithm,
555 elems.challenge - 2, elems.challenge_len + 2,
556 wk->filter_ta, wk->probe_auth.key,
557 wk->probe_auth.key_len, wk->probe_auth.key_idx);
558 wk->probe_auth.transaction = 4;
559 }
560
561 static enum work_action __must_check
562 ieee80211_rx_mgmt_auth(struct ieee80211_work *wk,
563 struct ieee80211_mgmt *mgmt, size_t len)
564 {
565 u16 auth_alg, auth_transaction, status_code;
566
567 if (wk->type != IEEE80211_WORK_AUTH)
568 return WORK_ACT_NONE;
569
570 if (len < 24 + 6)
571 return WORK_ACT_NONE;
572
573 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
574 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
575 status_code = le16_to_cpu(mgmt->u.auth.status_code);
576
577 if (auth_alg != wk->probe_auth.algorithm ||
578 auth_transaction != wk->probe_auth.transaction)
579 return WORK_ACT_NONE;
580
581 if (status_code != WLAN_STATUS_SUCCESS) {
582 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
583 wk->sdata->name, mgmt->sa, status_code);
584 return WORK_ACT_DONE;
585 }
586
587 switch (wk->probe_auth.algorithm) {
588 case WLAN_AUTH_OPEN:
589 case WLAN_AUTH_LEAP:
590 case WLAN_AUTH_FT:
591 break;
592 case WLAN_AUTH_SHARED_KEY:
593 if (wk->probe_auth.transaction != 4) {
594 ieee80211_auth_challenge(wk, mgmt, len);
595 /* need another frame */
596 return WORK_ACT_NONE;
597 }
598 break;
599 default:
600 WARN_ON(1);
601 return WORK_ACT_NONE;
602 }
603
604 printk(KERN_DEBUG "%s: authenticated\n", wk->sdata->name);
605 return WORK_ACT_DONE;
606 }
607
608 static enum work_action __must_check
609 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_work *wk,
610 struct ieee80211_mgmt *mgmt, size_t len,
611 bool reassoc)
612 {
613 struct ieee80211_sub_if_data *sdata = wk->sdata;
614 struct ieee80211_local *local = sdata->local;
615 u16 capab_info, status_code, aid;
616 struct ieee802_11_elems elems;
617 u8 *pos;
618
619 /*
620 * AssocResp and ReassocResp have identical structure, so process both
621 * of them in this function.
622 */
623
624 if (len < 24 + 6)
625 return WORK_ACT_NONE;
626
627 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
628 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
629 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
630
631 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
632 "status=%d aid=%d)\n",
633 sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
634 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
635
636 pos = mgmt->u.assoc_resp.variable;
637 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
638
639 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
640 elems.timeout_int && elems.timeout_int_len == 5 &&
641 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
642 u32 tu, ms;
643 tu = get_unaligned_le32(elems.timeout_int + 1);
644 ms = tu * 1024 / 1000;
645 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
646 "comeback duration %u TU (%u ms)\n",
647 sdata->name, mgmt->sa, tu, ms);
648 wk->timeout = jiffies + msecs_to_jiffies(ms);
649 if (ms > IEEE80211_ASSOC_TIMEOUT)
650 run_again(local, wk->timeout);
651 return WORK_ACT_NONE;
652 }
653
654 if (status_code != WLAN_STATUS_SUCCESS)
655 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
656 sdata->name, mgmt->sa, status_code);
657 else
658 printk(KERN_DEBUG "%s: associated\n", sdata->name);
659
660 return WORK_ACT_DONE;
661 }
662
663 static enum work_action __must_check
664 ieee80211_rx_mgmt_probe_resp(struct ieee80211_work *wk,
665 struct ieee80211_mgmt *mgmt, size_t len,
666 struct ieee80211_rx_status *rx_status)
667 {
668 struct ieee80211_sub_if_data *sdata = wk->sdata;
669 struct ieee80211_local *local = sdata->local;
670 size_t baselen;
671
672 ASSERT_WORK_MTX(local);
673
674 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
675 if (baselen > len)
676 return WORK_ACT_NONE;
677
678 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
679 return WORK_ACT_DONE;
680 }
681
682 static void ieee80211_work_rx_queued_mgmt(struct ieee80211_local *local,
683 struct sk_buff *skb)
684 {
685 struct ieee80211_rx_status *rx_status;
686 struct ieee80211_mgmt *mgmt;
687 struct ieee80211_work *wk;
688 enum work_action rma = WORK_ACT_NONE;
689 u16 fc;
690
691 rx_status = (struct ieee80211_rx_status *) skb->cb;
692 mgmt = (struct ieee80211_mgmt *) skb->data;
693 fc = le16_to_cpu(mgmt->frame_control);
694
695 mutex_lock(&local->work_mtx);
696
697 list_for_each_entry(wk, &local->work_list, list) {
698 const u8 *bssid = NULL;
699
700 switch (wk->type) {
701 case IEEE80211_WORK_DIRECT_PROBE:
702 case IEEE80211_WORK_AUTH:
703 case IEEE80211_WORK_ASSOC:
704 bssid = wk->filter_ta;
705 break;
706 default:
707 continue;
708 }
709
710 /*
711 * Before queuing, we already verified mgmt->sa,
712 * so this is needed just for matching.
713 */
714 if (compare_ether_addr(bssid, mgmt->bssid))
715 continue;
716
717 switch (fc & IEEE80211_FCTL_STYPE) {
718 case IEEE80211_STYPE_PROBE_RESP:
719 rma = ieee80211_rx_mgmt_probe_resp(wk, mgmt, skb->len,
720 rx_status);
721 break;
722 case IEEE80211_STYPE_AUTH:
723 rma = ieee80211_rx_mgmt_auth(wk, mgmt, skb->len);
724 break;
725 case IEEE80211_STYPE_ASSOC_RESP:
726 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
727 skb->len, false);
728 break;
729 case IEEE80211_STYPE_REASSOC_RESP:
730 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
731 skb->len, true);
732 break;
733 default:
734 WARN_ON(1);
735 }
736 /*
737 * We've processed this frame for that work, so it can't
738 * belong to another work struct.
739 * NB: this is also required for correctness for 'rma'!
740 */
741 break;
742 }
743
744 switch (rma) {
745 case WORK_ACT_NONE:
746 break;
747 case WORK_ACT_DONE:
748 list_del_rcu(&wk->list);
749 break;
750 default:
751 WARN(1, "unexpected: %d", rma);
752 }
753
754 mutex_unlock(&local->work_mtx);
755
756 if (rma != WORK_ACT_DONE)
757 goto out;
758
759 switch (wk->done(wk, skb)) {
760 case WORK_DONE_DESTROY:
761 free_work(wk);
762 break;
763 case WORK_DONE_REQUEUE:
764 synchronize_rcu();
765 wk->timeout = jiffies; /* run again directly */
766 mutex_lock(&local->work_mtx);
767 list_add_tail(&wk->list, &local->work_list);
768 mutex_unlock(&local->work_mtx);
769 }
770
771 out:
772 kfree_skb(skb);
773 }
774
775 static void ieee80211_work_timer(unsigned long data)
776 {
777 struct ieee80211_local *local = (void *) data;
778
779 if (local->quiescing)
780 return;
781
782 ieee80211_queue_work(&local->hw, &local->work_work);
783 }
784
785 static void ieee80211_work_work(struct work_struct *work)
786 {
787 struct ieee80211_local *local =
788 container_of(work, struct ieee80211_local, work_work);
789 struct sk_buff *skb;
790 struct ieee80211_work *wk, *tmp;
791 LIST_HEAD(free_work);
792 enum work_action rma;
793
794 if (local->scanning)
795 return;
796
797 /*
798 * ieee80211_queue_work() should have picked up most cases,
799 * here we'll pick the the rest.
800 */
801 if (WARN(local->suspended, "work scheduled while going to suspend\n"))
802 return;
803
804 /* first process frames to avoid timing out while a frame is pending */
805 while ((skb = skb_dequeue(&local->work_skb_queue)))
806 ieee80211_work_rx_queued_mgmt(local, skb);
807
808 ieee80211_recalc_idle(local);
809
810 mutex_lock(&local->work_mtx);
811
812 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
813 if (time_is_after_jiffies(wk->timeout)) {
814 /*
815 * This work item isn't supposed to be worked on
816 * right now, but take care to adjust the timer
817 * properly.
818 */
819 run_again(local, wk->timeout);
820 continue;
821 }
822
823 switch (wk->type) {
824 default:
825 WARN_ON(1);
826 /* nothing */
827 rma = WORK_ACT_NONE;
828 break;
829 case IEEE80211_WORK_DIRECT_PROBE:
830 rma = ieee80211_direct_probe(wk);
831 break;
832 case IEEE80211_WORK_AUTH:
833 rma = ieee80211_authenticate(wk);
834 break;
835 case IEEE80211_WORK_ASSOC:
836 rma = ieee80211_associate(wk);
837 break;
838 }
839
840 switch (rma) {
841 case WORK_ACT_NONE:
842 /* no action required */
843 break;
844 case WORK_ACT_TIMEOUT:
845 list_del_rcu(&wk->list);
846 synchronize_rcu();
847 list_add(&wk->list, &free_work);
848 break;
849 default:
850 WARN(1, "unexpected: %d", rma);
851 }
852 }
853
854 if (list_empty(&local->work_list) && local->scan_req)
855 ieee80211_queue_delayed_work(&local->hw,
856 &local->scan_work,
857 round_jiffies_relative(0));
858
859 mutex_unlock(&local->work_mtx);
860
861 list_for_each_entry_safe(wk, tmp, &free_work, list) {
862 wk->done(wk, NULL);
863 list_del(&wk->list);
864 kfree(wk);
865 }
866 }
867
868 void ieee80211_add_work(struct ieee80211_work *wk)
869 {
870 struct ieee80211_local *local;
871
872 if (WARN_ON(!wk->chan))
873 return;
874
875 if (WARN_ON(!wk->sdata))
876 return;
877
878 if (WARN_ON(!wk->done))
879 return;
880
881 wk->timeout = jiffies;
882
883 local = wk->sdata->local;
884 mutex_lock(&local->work_mtx);
885 list_add_tail(&wk->list, &local->work_list);
886 mutex_unlock(&local->work_mtx);
887
888 ieee80211_queue_work(&local->hw, &local->work_work);
889 }
890
891 void ieee80211_work_init(struct ieee80211_local *local)
892 {
893 mutex_init(&local->work_mtx);
894 INIT_LIST_HEAD(&local->work_list);
895 setup_timer(&local->work_timer, ieee80211_work_timer,
896 (unsigned long)local);
897 INIT_WORK(&local->work_work, ieee80211_work_work);
898 skb_queue_head_init(&local->work_skb_queue);
899 }
900
901 void ieee80211_work_purge(struct ieee80211_sub_if_data *sdata)
902 {
903 struct ieee80211_local *local = sdata->local;
904 struct ieee80211_work *wk, *tmp;
905
906 mutex_lock(&local->work_mtx);
907 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
908 if (wk->sdata != sdata)
909 continue;
910 list_del(&wk->list);
911 free_work(wk);
912 }
913 mutex_unlock(&local->work_mtx);
914 }
915
916 ieee80211_rx_result ieee80211_work_rx_mgmt(struct ieee80211_sub_if_data *sdata,
917 struct sk_buff *skb)
918 {
919 struct ieee80211_local *local = sdata->local;
920 struct ieee80211_mgmt *mgmt;
921 struct ieee80211_work *wk;
922 u16 fc;
923
924 if (skb->len < 24)
925 return RX_DROP_MONITOR;
926
927 mgmt = (struct ieee80211_mgmt *) skb->data;
928 fc = le16_to_cpu(mgmt->frame_control);
929
930 list_for_each_entry_rcu(wk, &local->work_list, list) {
931 if (sdata != wk->sdata)
932 continue;
933 if (compare_ether_addr(wk->filter_ta, mgmt->sa))
934 continue;
935 if (compare_ether_addr(wk->filter_ta, mgmt->bssid))
936 continue;
937
938 switch (fc & IEEE80211_FCTL_STYPE) {
939 case IEEE80211_STYPE_AUTH:
940 case IEEE80211_STYPE_PROBE_RESP:
941 case IEEE80211_STYPE_ASSOC_RESP:
942 case IEEE80211_STYPE_REASSOC_RESP:
943 case IEEE80211_STYPE_DEAUTH:
944 case IEEE80211_STYPE_DISASSOC:
945 skb_queue_tail(&local->work_skb_queue, skb);
946 ieee80211_queue_work(&local->hw, &local->work_work);
947 return RX_QUEUED;
948 }
949 }
950
951 return RX_CONTINUE;
952 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree