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writeback: split writeback_inodes_wb
[linux-2.6/next.git] / net / mac80211 / work.c
blobb025dc7bb0fd4e1decb356709cb3ac5d3163db58
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_MISMATCH,
37 WORK_ACT_NONE,
38 WORK_ACT_TIMEOUT,
39 WORK_ACT_DONE,
40 };
41
42
43 /* utils */
44 static inline void ASSERT_WORK_MTX(struct ieee80211_local *local)
45 {
46 WARN_ON(!mutex_is_locked(&local->work_mtx));
47 }
48
49 /*
50 * We can have multiple work items (and connection probing)
51 * scheduling this timer, but we need to take care to only
52 * reschedule it when it should fire _earlier_ than it was
53 * asked for before, or if it's not pending right now. This
54 * function ensures that. Note that it then is required to
55 * run this function for all timeouts after the first one
56 * has happened -- the work that runs from this timer will
57 * do that.
58 */
59 static void run_again(struct ieee80211_local *local,
60 unsigned long timeout)
61 {
62 ASSERT_WORK_MTX(local);
63
64 if (!timer_pending(&local->work_timer) ||
65 time_before(timeout, local->work_timer.expires))
66 mod_timer(&local->work_timer, timeout);
67 }
68
69 static void work_free_rcu(struct rcu_head *head)
70 {
71 struct ieee80211_work *wk =
72 container_of(head, struct ieee80211_work, rcu_head);
73
74 kfree(wk);
75 }
76
77 void free_work(struct ieee80211_work *wk)
78 {
79 call_rcu(&wk->rcu_head, work_free_rcu);
80 }
81
82 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
83 struct ieee80211_supported_band *sband,
84 u32 *rates)
85 {
86 int i, j, count;
87 *rates = 0;
88 count = 0;
89 for (i = 0; i < supp_rates_len; i++) {
90 int rate = (supp_rates[i] & 0x7F) * 5;
91
92 for (j = 0; j < sband->n_bitrates; j++)
93 if (sband->bitrates[j].bitrate == rate) {
94 *rates |= BIT(j);
95 count++;
96 break;
97 }
98 }
99
100 return count;
101 }
102
103 /* frame sending functions */
104
105 static void ieee80211_add_ht_ie(struct sk_buff *skb, const u8 *ht_info_ie,
106 struct ieee80211_supported_band *sband,
107 struct ieee80211_channel *channel,
108 enum ieee80211_smps_mode smps)
109 {
110 struct ieee80211_ht_info *ht_info;
111 u8 *pos;
112 u32 flags = channel->flags;
113 u16 cap = sband->ht_cap.cap;
114 __le16 tmp;
115
116 if (!sband->ht_cap.ht_supported)
117 return;
118
119 if (!ht_info_ie)
120 return;
121
122 if (ht_info_ie[1] < sizeof(struct ieee80211_ht_info))
123 return;
124
125 ht_info = (struct ieee80211_ht_info *)(ht_info_ie + 2);
126
127 /* determine capability flags */
128
129 if (ieee80211_disable_40mhz_24ghz &&
130 sband->band == IEEE80211_BAND_2GHZ) {
131 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
132 cap &= ~IEEE80211_HT_CAP_SGI_40;
133 }
134
135 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
136 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
137 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
138 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
139 cap &= ~IEEE80211_HT_CAP_SGI_40;
140 }
141 break;
142 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
143 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
144 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
145 cap &= ~IEEE80211_HT_CAP_SGI_40;
146 }
147 break;
148 }
149
150 /* set SM PS mode properly */
151 cap &= ~IEEE80211_HT_CAP_SM_PS;
152 switch (smps) {
153 case IEEE80211_SMPS_AUTOMATIC:
154 case IEEE80211_SMPS_NUM_MODES:
155 WARN_ON(1);
156 case IEEE80211_SMPS_OFF:
157 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
158 IEEE80211_HT_CAP_SM_PS_SHIFT;
159 break;
160 case IEEE80211_SMPS_STATIC:
161 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
162 IEEE80211_HT_CAP_SM_PS_SHIFT;
163 break;
164 case IEEE80211_SMPS_DYNAMIC:
165 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
166 IEEE80211_HT_CAP_SM_PS_SHIFT;
167 break;
168 }
169
170 /* reserve and fill IE */
171
172 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
173 *pos++ = WLAN_EID_HT_CAPABILITY;
174 *pos++ = sizeof(struct ieee80211_ht_cap);
175 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
176
177 /* capability flags */
178 tmp = cpu_to_le16(cap);
179 memcpy(pos, &tmp, sizeof(u16));
180 pos += sizeof(u16);
181
182 /* AMPDU parameters */
183 *pos++ = sband->ht_cap.ampdu_factor |
184 (sband->ht_cap.ampdu_density <<
185 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
186
187 /* MCS set */
188 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
189 pos += sizeof(sband->ht_cap.mcs);
190
191 /* extended capabilities */
192 pos += sizeof(__le16);
193
194 /* BF capabilities */
195 pos += sizeof(__le32);
196
197 /* antenna selection */
198 pos += sizeof(u8);
199 }
200
201 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
202 struct ieee80211_work *wk)
203 {
204 struct ieee80211_local *local = sdata->local;
205 struct sk_buff *skb;
206 struct ieee80211_mgmt *mgmt;
207 u8 *pos, qos_info;
208 const u8 *ies;
209 size_t offset = 0, noffset;
210 int i, len, count, rates_len, supp_rates_len;
211 u16 capab;
212 struct ieee80211_supported_band *sband;
213 u32 rates = 0;
214
215 sband = local->hw.wiphy->bands[wk->chan->band];
216
217 if (wk->assoc.supp_rates_len) {
218 /*
219 * Get all rates supported by the device and the AP as
220 * some APs don't like getting a superset of their rates
221 * in the association request (e.g. D-Link DAP 1353 in
222 * b-only mode)...
223 */
224 rates_len = ieee80211_compatible_rates(wk->assoc.supp_rates,
225 wk->assoc.supp_rates_len,
226 sband, &rates);
227 } else {
228 /*
229 * In case AP not provide any supported rates information
230 * before association, we send information element(s) with
231 * all rates that we support.
232 */
233 rates = ~0;
234 rates_len = sband->n_bitrates;
235 }
236
237 skb = alloc_skb(local->hw.extra_tx_headroom +
238 sizeof(*mgmt) + /* bit too much but doesn't matter */
239 2 + wk->assoc.ssid_len + /* SSID */
240 4 + rates_len + /* (extended) rates */
241 4 + /* power capability */
242 2 + 2 * sband->n_channels + /* supported channels */
243 2 + sizeof(struct ieee80211_ht_cap) + /* HT */
244 wk->ie_len + /* extra IEs */
245 9, /* WMM */
246 GFP_KERNEL);
247 if (!skb) {
248 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
249 "frame\n", sdata->name);
250 return;
251 }
252 skb_reserve(skb, local->hw.extra_tx_headroom);
253
254 capab = WLAN_CAPABILITY_ESS;
255
256 if (sband->band == IEEE80211_BAND_2GHZ) {
257 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
258 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
259 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
260 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
261 }
262
263 if (wk->assoc.capability & WLAN_CAPABILITY_PRIVACY)
264 capab |= WLAN_CAPABILITY_PRIVACY;
265
266 if ((wk->assoc.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
267 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
268 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
269
270 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
271 memset(mgmt, 0, 24);
272 memcpy(mgmt->da, wk->filter_ta, ETH_ALEN);
273 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
274 memcpy(mgmt->bssid, wk->filter_ta, ETH_ALEN);
275
276 if (!is_zero_ether_addr(wk->assoc.prev_bssid)) {
277 skb_put(skb, 10);
278 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
279 IEEE80211_STYPE_REASSOC_REQ);
280 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
281 mgmt->u.reassoc_req.listen_interval =
282 cpu_to_le16(local->hw.conf.listen_interval);
283 memcpy(mgmt->u.reassoc_req.current_ap, wk->assoc.prev_bssid,
284 ETH_ALEN);
285 } else {
286 skb_put(skb, 4);
287 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
288 IEEE80211_STYPE_ASSOC_REQ);
289 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
290 mgmt->u.assoc_req.listen_interval =
291 cpu_to_le16(local->hw.conf.listen_interval);
292 }
293
294 /* SSID */
295 ies = pos = skb_put(skb, 2 + wk->assoc.ssid_len);
296 *pos++ = WLAN_EID_SSID;
297 *pos++ = wk->assoc.ssid_len;
298 memcpy(pos, wk->assoc.ssid, wk->assoc.ssid_len);
299
300 /* add all rates which were marked to be used above */
301 supp_rates_len = rates_len;
302 if (supp_rates_len > 8)
303 supp_rates_len = 8;
304
305 len = sband->n_bitrates;
306 pos = skb_put(skb, supp_rates_len + 2);
307 *pos++ = WLAN_EID_SUPP_RATES;
308 *pos++ = supp_rates_len;
309
310 count = 0;
311 for (i = 0; i < sband->n_bitrates; i++) {
312 if (BIT(i) & rates) {
313 int rate = sband->bitrates[i].bitrate;
314 *pos++ = (u8) (rate / 5);
315 if (++count == 8)
316 break;
317 }
318 }
319
320 if (rates_len > count) {
321 pos = skb_put(skb, rates_len - count + 2);
322 *pos++ = WLAN_EID_EXT_SUPP_RATES;
323 *pos++ = rates_len - count;
324
325 for (i++; i < sband->n_bitrates; i++) {
326 if (BIT(i) & rates) {
327 int rate = sband->bitrates[i].bitrate;
328 *pos++ = (u8) (rate / 5);
329 }
330 }
331 }
332
333 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
334 /* 1. power capabilities */
335 pos = skb_put(skb, 4);
336 *pos++ = WLAN_EID_PWR_CAPABILITY;
337 *pos++ = 2;
338 *pos++ = 0; /* min tx power */
339 *pos++ = wk->chan->max_power; /* max tx power */
340
341 /* 2. supported channels */
342 /* TODO: get this in reg domain format */
343 pos = skb_put(skb, 2 * sband->n_channels + 2);
344 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
345 *pos++ = 2 * sband->n_channels;
346 for (i = 0; i < sband->n_channels; i++) {
347 *pos++ = ieee80211_frequency_to_channel(
348 sband->channels[i].center_freq);
349 *pos++ = 1; /* one channel in the subband*/
350 }
351 }
352
353 /* if present, add any custom IEs that go before HT */
354 if (wk->ie_len && wk->ie) {
355 static const u8 before_ht[] = {
356 WLAN_EID_SSID,
357 WLAN_EID_SUPP_RATES,
358 WLAN_EID_EXT_SUPP_RATES,
359 WLAN_EID_PWR_CAPABILITY,
360 WLAN_EID_SUPPORTED_CHANNELS,
361 WLAN_EID_RSN,
362 WLAN_EID_QOS_CAPA,
363 WLAN_EID_RRM_ENABLED_CAPABILITIES,
364 WLAN_EID_MOBILITY_DOMAIN,
365 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
366 };
367 noffset = ieee80211_ie_split(wk->ie, wk->ie_len,
368 before_ht, ARRAY_SIZE(before_ht),
369 offset);
370 pos = skb_put(skb, noffset - offset);
371 memcpy(pos, wk->ie + offset, noffset - offset);
372 offset = noffset;
373 }
374
375 if (wk->assoc.use_11n && wk->assoc.wmm_used &&
376 local->hw.queues >= 4)
377 ieee80211_add_ht_ie(skb, wk->assoc.ht_information_ie,
378 sband, wk->chan, wk->assoc.smps);
379
380 /* if present, add any custom non-vendor IEs that go after HT */
381 if (wk->ie_len && wk->ie) {
382 noffset = ieee80211_ie_split_vendor(wk->ie, wk->ie_len,
383 offset);
384 pos = skb_put(skb, noffset - offset);
385 memcpy(pos, wk->ie + offset, noffset - offset);
386 offset = noffset;
387 }
388
389 if (wk->assoc.wmm_used && local->hw.queues >= 4) {
390 if (wk->assoc.uapsd_used) {
391 qos_info = local->uapsd_queues;
392 qos_info |= (local->uapsd_max_sp_len <<
393 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
394 } else {
395 qos_info = 0;
396 }
397
398 pos = skb_put(skb, 9);
399 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
400 *pos++ = 7; /* len */
401 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
402 *pos++ = 0x50;
403 *pos++ = 0xf2;
404 *pos++ = 2; /* WME */
405 *pos++ = 0; /* WME info */
406 *pos++ = 1; /* WME ver */
407 *pos++ = qos_info;
408 }
409
410 /* add any remaining custom (i.e. vendor specific here) IEs */
411 if (wk->ie_len && wk->ie) {
412 noffset = wk->ie_len;
413 pos = skb_put(skb, noffset - offset);
414 memcpy(pos, wk->ie + offset, noffset - offset);
415 }
416
417 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
418 ieee80211_tx_skb(sdata, skb);
419 }
420
421 static void ieee80211_remove_auth_bss(struct ieee80211_local *local,
422 struct ieee80211_work *wk)
423 {
424 struct cfg80211_bss *cbss;
425 u16 capa_val = WLAN_CAPABILITY_ESS;
426
427 if (wk->probe_auth.privacy)
428 capa_val |= WLAN_CAPABILITY_PRIVACY;
429
430 cbss = cfg80211_get_bss(local->hw.wiphy, wk->chan, wk->filter_ta,
431 wk->probe_auth.ssid, wk->probe_auth.ssid_len,
432 WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
433 capa_val);
434 if (!cbss)
435 return;
436
437 cfg80211_unlink_bss(local->hw.wiphy, cbss);
438 cfg80211_put_bss(cbss);
439 }
440
441 static enum work_action __must_check
442 ieee80211_direct_probe(struct ieee80211_work *wk)
443 {
444 struct ieee80211_sub_if_data *sdata = wk->sdata;
445 struct ieee80211_local *local = sdata->local;
446
447 wk->probe_auth.tries++;
448 if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
449 printk(KERN_DEBUG "%s: direct probe to %pM timed out\n",
450 sdata->name, wk->filter_ta);
451
452 /*
453 * Most likely AP is not in the range so remove the
454 * bss struct for that AP.
455 */
456 ieee80211_remove_auth_bss(local, wk);
457
458 return WORK_ACT_TIMEOUT;
459 }
460
461 printk(KERN_DEBUG "%s: direct probe to %pM (try %d)\n",
462 sdata->name, wk->filter_ta, wk->probe_auth.tries);
463
464 /*
465 * Direct probe is sent to broadcast address as some APs
466 * will not answer to direct packet in unassociated state.
467 */
468 ieee80211_send_probe_req(sdata, NULL, wk->probe_auth.ssid,
469 wk->probe_auth.ssid_len, NULL, 0);
470
471 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
472 run_again(local, wk->timeout);
473
474 return WORK_ACT_NONE;
475 }
476
477
478 static enum work_action __must_check
479 ieee80211_authenticate(struct ieee80211_work *wk)
480 {
481 struct ieee80211_sub_if_data *sdata = wk->sdata;
482 struct ieee80211_local *local = sdata->local;
483
484 wk->probe_auth.tries++;
485 if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
486 printk(KERN_DEBUG "%s: authentication with %pM"
487 " timed out\n", sdata->name, wk->filter_ta);
488
489 /*
490 * Most likely AP is not in the range so remove the
491 * bss struct for that AP.
492 */
493 ieee80211_remove_auth_bss(local, wk);
494
495 return WORK_ACT_TIMEOUT;
496 }
497
498 printk(KERN_DEBUG "%s: authenticate with %pM (try %d)\n",
499 sdata->name, wk->filter_ta, wk->probe_auth.tries);
500
501 ieee80211_send_auth(sdata, 1, wk->probe_auth.algorithm, wk->ie,
502 wk->ie_len, wk->filter_ta, NULL, 0, 0);
503 wk->probe_auth.transaction = 2;
504
505 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
506 run_again(local, wk->timeout);
507
508 return WORK_ACT_NONE;
509 }
510
511 static enum work_action __must_check
512 ieee80211_associate(struct ieee80211_work *wk)
513 {
514 struct ieee80211_sub_if_data *sdata = wk->sdata;
515 struct ieee80211_local *local = sdata->local;
516
517 wk->assoc.tries++;
518 if (wk->assoc.tries > IEEE80211_ASSOC_MAX_TRIES) {
519 printk(KERN_DEBUG "%s: association with %pM"
520 " timed out\n",
521 sdata->name, wk->filter_ta);
522
523 /*
524 * Most likely AP is not in the range so remove the
525 * bss struct for that AP.
526 */
527 if (wk->assoc.bss)
528 cfg80211_unlink_bss(local->hw.wiphy, wk->assoc.bss);
529
530 return WORK_ACT_TIMEOUT;
531 }
532
533 printk(KERN_DEBUG "%s: associate with %pM (try %d)\n",
534 sdata->name, wk->filter_ta, wk->assoc.tries);
535 ieee80211_send_assoc(sdata, wk);
536
537 wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
538 run_again(local, wk->timeout);
539
540 return WORK_ACT_NONE;
541 }
542
543 static enum work_action __must_check
544 ieee80211_remain_on_channel_timeout(struct ieee80211_work *wk)
545 {
546 /*
547 * First time we run, do nothing -- the generic code will
548 * have switched to the right channel etc.
549 */
550 if (!wk->started) {
551 wk->timeout = jiffies + msecs_to_jiffies(wk->remain.duration);
552
553 cfg80211_ready_on_channel(wk->sdata->dev, (unsigned long) wk,
554 wk->chan, wk->chan_type,
555 wk->remain.duration, GFP_KERNEL);
556
557 return WORK_ACT_NONE;
558 }
559
560 return WORK_ACT_TIMEOUT;
561 }
562
563 static void ieee80211_auth_challenge(struct ieee80211_work *wk,
564 struct ieee80211_mgmt *mgmt,
565 size_t len)
566 {
567 struct ieee80211_sub_if_data *sdata = wk->sdata;
568 u8 *pos;
569 struct ieee802_11_elems elems;
570
571 pos = mgmt->u.auth.variable;
572 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
573 if (!elems.challenge)
574 return;
575 ieee80211_send_auth(sdata, 3, wk->probe_auth.algorithm,
576 elems.challenge - 2, elems.challenge_len + 2,
577 wk->filter_ta, wk->probe_auth.key,
578 wk->probe_auth.key_len, wk->probe_auth.key_idx);
579 wk->probe_auth.transaction = 4;
580 }
581
582 static enum work_action __must_check
583 ieee80211_rx_mgmt_auth(struct ieee80211_work *wk,
584 struct ieee80211_mgmt *mgmt, size_t len)
585 {
586 u16 auth_alg, auth_transaction, status_code;
587
588 if (wk->type != IEEE80211_WORK_AUTH)
589 return WORK_ACT_MISMATCH;
590
591 if (len < 24 + 6)
592 return WORK_ACT_NONE;
593
594 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
595 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
596 status_code = le16_to_cpu(mgmt->u.auth.status_code);
597
598 if (auth_alg != wk->probe_auth.algorithm ||
599 auth_transaction != wk->probe_auth.transaction)
600 return WORK_ACT_NONE;
601
602 if (status_code != WLAN_STATUS_SUCCESS) {
603 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
604 wk->sdata->name, mgmt->sa, status_code);
605 return WORK_ACT_DONE;
606 }
607
608 switch (wk->probe_auth.algorithm) {
609 case WLAN_AUTH_OPEN:
610 case WLAN_AUTH_LEAP:
611 case WLAN_AUTH_FT:
612 break;
613 case WLAN_AUTH_SHARED_KEY:
614 if (wk->probe_auth.transaction != 4) {
615 ieee80211_auth_challenge(wk, mgmt, len);
616 /* need another frame */
617 return WORK_ACT_NONE;
618 }
619 break;
620 default:
621 WARN_ON(1);
622 return WORK_ACT_NONE;
623 }
624
625 printk(KERN_DEBUG "%s: authenticated\n", wk->sdata->name);
626 return WORK_ACT_DONE;
627 }
628
629 static enum work_action __must_check
630 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_work *wk,
631 struct ieee80211_mgmt *mgmt, size_t len,
632 bool reassoc)
633 {
634 struct ieee80211_sub_if_data *sdata = wk->sdata;
635 struct ieee80211_local *local = sdata->local;
636 u16 capab_info, status_code, aid;
637 struct ieee802_11_elems elems;
638 u8 *pos;
639
640 if (wk->type != IEEE80211_WORK_ASSOC)
641 return WORK_ACT_MISMATCH;
642
643 /*
644 * AssocResp and ReassocResp have identical structure, so process both
645 * of them in this function.
646 */
647
648 if (len < 24 + 6)
649 return WORK_ACT_NONE;
650
651 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
652 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
653 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
654
655 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
656 "status=%d aid=%d)\n",
657 sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
658 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
659
660 pos = mgmt->u.assoc_resp.variable;
661 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
662
663 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
664 elems.timeout_int && elems.timeout_int_len == 5 &&
665 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
666 u32 tu, ms;
667 tu = get_unaligned_le32(elems.timeout_int + 1);
668 ms = tu * 1024 / 1000;
669 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
670 "comeback duration %u TU (%u ms)\n",
671 sdata->name, mgmt->sa, tu, ms);
672 wk->timeout = jiffies + msecs_to_jiffies(ms);
673 if (ms > IEEE80211_ASSOC_TIMEOUT)
674 run_again(local, wk->timeout);
675 return WORK_ACT_NONE;
676 }
677
678 if (status_code != WLAN_STATUS_SUCCESS)
679 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
680 sdata->name, mgmt->sa, status_code);
681 else
682 printk(KERN_DEBUG "%s: associated\n", sdata->name);
683
684 return WORK_ACT_DONE;
685 }
686
687 static enum work_action __must_check
688 ieee80211_rx_mgmt_probe_resp(struct ieee80211_work *wk,
689 struct ieee80211_mgmt *mgmt, size_t len,
690 struct ieee80211_rx_status *rx_status)
691 {
692 struct ieee80211_sub_if_data *sdata = wk->sdata;
693 struct ieee80211_local *local = sdata->local;
694 size_t baselen;
695
696 ASSERT_WORK_MTX(local);
697
698 if (wk->type != IEEE80211_WORK_DIRECT_PROBE)
699 return WORK_ACT_MISMATCH;
700
701 if (len < 24 + 12)
702 return WORK_ACT_NONE;
703
704 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
705 if (baselen > len)
706 return WORK_ACT_NONE;
707
708 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
709 return WORK_ACT_DONE;
710 }
711
712 static void ieee80211_work_rx_queued_mgmt(struct ieee80211_local *local,
713 struct sk_buff *skb)
714 {
715 struct ieee80211_rx_status *rx_status;
716 struct ieee80211_mgmt *mgmt;
717 struct ieee80211_work *wk;
718 enum work_action rma = WORK_ACT_NONE;
719 u16 fc;
720
721 rx_status = (struct ieee80211_rx_status *) skb->cb;
722 mgmt = (struct ieee80211_mgmt *) skb->data;
723 fc = le16_to_cpu(mgmt->frame_control);
724
725 mutex_lock(&local->work_mtx);
726
727 list_for_each_entry(wk, &local->work_list, list) {
728 const u8 *bssid = NULL;
729
730 switch (wk->type) {
731 case IEEE80211_WORK_DIRECT_PROBE:
732 case IEEE80211_WORK_AUTH:
733 case IEEE80211_WORK_ASSOC:
734 bssid = wk->filter_ta;
735 break;
736 default:
737 continue;
738 }
739
740 /*
741 * Before queuing, we already verified mgmt->sa,
742 * so this is needed just for matching.
743 */
744 if (compare_ether_addr(bssid, mgmt->bssid))
745 continue;
746
747 switch (fc & IEEE80211_FCTL_STYPE) {
748 case IEEE80211_STYPE_PROBE_RESP:
749 rma = ieee80211_rx_mgmt_probe_resp(wk, mgmt, skb->len,
750 rx_status);
751 break;
752 case IEEE80211_STYPE_AUTH:
753 rma = ieee80211_rx_mgmt_auth(wk, mgmt, skb->len);
754 break;
755 case IEEE80211_STYPE_ASSOC_RESP:
756 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
757 skb->len, false);
758 break;
759 case IEEE80211_STYPE_REASSOC_RESP:
760 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
761 skb->len, true);
762 break;
763 default:
764 WARN_ON(1);
765 rma = WORK_ACT_NONE;
766 }
767
768 /*
769 * We've either received an unexpected frame, or we have
770 * multiple work items and need to match the frame to the
771 * right one.
772 */
773 if (rma == WORK_ACT_MISMATCH)
774 continue;
775
776 /*
777 * We've processed this frame for that work, so it can't
778 * belong to another work struct.
779 * NB: this is also required for correctness for 'rma'!
780 */
781 break;
782 }
783
784 switch (rma) {
785 case WORK_ACT_MISMATCH:
786 /* ignore this unmatched frame */
787 break;
788 case WORK_ACT_NONE:
789 break;
790 case WORK_ACT_DONE:
791 list_del_rcu(&wk->list);
792 break;
793 default:
794 WARN(1, "unexpected: %d", rma);
795 }
796
797 mutex_unlock(&local->work_mtx);
798
799 if (rma != WORK_ACT_DONE)
800 goto out;
801
802 switch (wk->done(wk, skb)) {
803 case WORK_DONE_DESTROY:
804 free_work(wk);
805 break;
806 case WORK_DONE_REQUEUE:
807 synchronize_rcu();
808 wk->started = false; /* restart */
809 mutex_lock(&local->work_mtx);
810 list_add_tail(&wk->list, &local->work_list);
811 mutex_unlock(&local->work_mtx);
812 }
813
814 out:
815 kfree_skb(skb);
816 }
817
818 static void ieee80211_work_timer(unsigned long data)
819 {
820 struct ieee80211_local *local = (void *) data;
821
822 if (local->quiescing)
823 return;
824
825 ieee80211_queue_work(&local->hw, &local->work_work);
826 }
827
828 static void ieee80211_work_work(struct work_struct *work)
829 {
830 struct ieee80211_local *local =
831 container_of(work, struct ieee80211_local, work_work);
832 struct sk_buff *skb;
833 struct ieee80211_work *wk, *tmp;
834 LIST_HEAD(free_work);
835 enum work_action rma;
836 bool remain_off_channel = false;
837
838 if (local->scanning)
839 return;
840
841 /*
842 * ieee80211_queue_work() should have picked up most cases,
843 * here we'll pick the the rest.
844 */
845 if (WARN(local->suspended, "work scheduled while going to suspend\n"))
846 return;
847
848 /* first process frames to avoid timing out while a frame is pending */
849 while ((skb = skb_dequeue(&local->work_skb_queue)))
850 ieee80211_work_rx_queued_mgmt(local, skb);
851
852 ieee80211_recalc_idle(local);
853
854 mutex_lock(&local->work_mtx);
855
856 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
857 bool started = wk->started;
858
859 /* mark work as started if it's on the current off-channel */
860 if (!started && local->tmp_channel &&
861 wk->chan == local->tmp_channel &&
862 wk->chan_type == local->tmp_channel_type) {
863 started = true;
864 wk->timeout = jiffies;
865 }
866
867 if (!started && !local->tmp_channel) {
868 /*
869 * TODO: could optimize this by leaving the
870 * station vifs in awake mode if they
871 * happen to be on the same channel as
872 * the requested channel
873 */
874 ieee80211_offchannel_stop_beaconing(local);
875 ieee80211_offchannel_stop_station(local);
876
877 local->tmp_channel = wk->chan;
878 local->tmp_channel_type = wk->chan_type;
879 ieee80211_hw_config(local, 0);
880 started = true;
881 wk->timeout = jiffies;
882 }
883
884 /* don't try to work with items that aren't started */
885 if (!started)
886 continue;
887
888 if (time_is_after_jiffies(wk->timeout)) {
889 /*
890 * This work item isn't supposed to be worked on
891 * right now, but take care to adjust the timer
892 * properly.
893 */
894 run_again(local, wk->timeout);
895 continue;
896 }
897
898 switch (wk->type) {
899 default:
900 WARN_ON(1);
901 /* nothing */
902 rma = WORK_ACT_NONE;
903 break;
904 case IEEE80211_WORK_ABORT:
905 rma = WORK_ACT_TIMEOUT;
906 break;
907 case IEEE80211_WORK_DIRECT_PROBE:
908 rma = ieee80211_direct_probe(wk);
909 break;
910 case IEEE80211_WORK_AUTH:
911 rma = ieee80211_authenticate(wk);
912 break;
913 case IEEE80211_WORK_ASSOC:
914 rma = ieee80211_associate(wk);
915 break;
916 case IEEE80211_WORK_REMAIN_ON_CHANNEL:
917 rma = ieee80211_remain_on_channel_timeout(wk);
918 break;
919 }
920
921 wk->started = started;
922
923 switch (rma) {
924 case WORK_ACT_NONE:
925 /* might have changed the timeout */
926 run_again(local, wk->timeout);
927 break;
928 case WORK_ACT_TIMEOUT:
929 list_del_rcu(&wk->list);
930 synchronize_rcu();
931 list_add(&wk->list, &free_work);
932 break;
933 default:
934 WARN(1, "unexpected: %d", rma);
935 }
936 }
937
938 list_for_each_entry(wk, &local->work_list, list) {
939 if (!wk->started)
940 continue;
941 if (wk->chan != local->tmp_channel)
942 continue;
943 if (wk->chan_type != local->tmp_channel_type)
944 continue;
945 remain_off_channel = true;
946 }
947
948 if (!remain_off_channel && local->tmp_channel) {
949 local->tmp_channel = NULL;
950 ieee80211_hw_config(local, 0);
951 ieee80211_offchannel_return(local, true);
952 /* give connection some time to breathe */
953 run_again(local, jiffies + HZ/2);
954 }
955
956 mutex_lock(&local->scan_mtx);
957
958 if (list_empty(&local->work_list) && local->scan_req &&
959 !local->scanning)
960 ieee80211_queue_delayed_work(&local->hw,
961 &local->scan_work,
962 round_jiffies_relative(0));
963
964 mutex_unlock(&local->scan_mtx);
965
966 mutex_unlock(&local->work_mtx);
967
968 ieee80211_recalc_idle(local);
969
970 list_for_each_entry_safe(wk, tmp, &free_work, list) {
971 wk->done(wk, NULL);
972 list_del(&wk->list);
973 kfree(wk);
974 }
975 }
976
977 void ieee80211_add_work(struct ieee80211_work *wk)
978 {
979 struct ieee80211_local *local;
980
981 if (WARN_ON(!wk->chan))
982 return;
983
984 if (WARN_ON(!wk->sdata))
985 return;
986
987 if (WARN_ON(!wk->done))
988 return;
989
990 if (WARN_ON(!ieee80211_sdata_running(wk->sdata)))
991 return;
992
993 wk->started = false;
994
995 local = wk->sdata->local;
996 mutex_lock(&local->work_mtx);
997 list_add_tail(&wk->list, &local->work_list);
998 mutex_unlock(&local->work_mtx);
999
1000 ieee80211_queue_work(&local->hw, &local->work_work);
1001 }
1002
1003 void ieee80211_work_init(struct ieee80211_local *local)
1004 {
1005 mutex_init(&local->work_mtx);
1006 INIT_LIST_HEAD(&local->work_list);
1007 setup_timer(&local->work_timer, ieee80211_work_timer,
1008 (unsigned long)local);
1009 INIT_WORK(&local->work_work, ieee80211_work_work);
1010 skb_queue_head_init(&local->work_skb_queue);
1011 }
1012
1013 void ieee80211_work_purge(struct ieee80211_sub_if_data *sdata)
1014 {
1015 struct ieee80211_local *local = sdata->local;
1016 struct ieee80211_work *wk;
1017
1018 mutex_lock(&local->work_mtx);
1019 list_for_each_entry(wk, &local->work_list, list) {
1020 if (wk->sdata != sdata)
1021 continue;
1022 wk->type = IEEE80211_WORK_ABORT;
1023 wk->started = true;
1024 wk->timeout = jiffies;
1025 }
1026 mutex_unlock(&local->work_mtx);
1027
1028 /* run cleanups etc. */
1029 ieee80211_work_work(&local->work_work);
1030
1031 mutex_lock(&local->work_mtx);
1032 list_for_each_entry(wk, &local->work_list, list) {
1033 if (wk->sdata != sdata)
1034 continue;
1035 WARN_ON(1);
1036 break;
1037 }
1038 mutex_unlock(&local->work_mtx);
1039 }
1040
1041 ieee80211_rx_result ieee80211_work_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1042 struct sk_buff *skb)
1043 {
1044 struct ieee80211_local *local = sdata->local;
1045 struct ieee80211_mgmt *mgmt;
1046 struct ieee80211_work *wk;
1047 u16 fc;
1048
1049 if (skb->len < 24)
1050 return RX_DROP_MONITOR;
1051
1052 mgmt = (struct ieee80211_mgmt *) skb->data;
1053 fc = le16_to_cpu(mgmt->frame_control);
1054
1055 list_for_each_entry_rcu(wk, &local->work_list, list) {
1056 if (sdata != wk->sdata)
1057 continue;
1058 if (compare_ether_addr(wk->filter_ta, mgmt->sa))
1059 continue;
1060 if (compare_ether_addr(wk->filter_ta, mgmt->bssid))
1061 continue;
1062
1063 switch (fc & IEEE80211_FCTL_STYPE) {
1064 case IEEE80211_STYPE_AUTH:
1065 case IEEE80211_STYPE_PROBE_RESP:
1066 case IEEE80211_STYPE_ASSOC_RESP:
1067 case IEEE80211_STYPE_REASSOC_RESP:
1068 skb_queue_tail(&local->work_skb_queue, skb);
1069 ieee80211_queue_work(&local->hw, &local->work_work);
1070 return RX_QUEUED;
1071 }
1072 }
1073
1074 return RX_CONTINUE;
1075 }
1076
1077 static enum work_done_result ieee80211_remain_done(struct ieee80211_work *wk,
1078 struct sk_buff *skb)
1079 {
1080 /*
1081 * We are done serving the remain-on-channel command.
1082 */
1083 cfg80211_remain_on_channel_expired(wk->sdata->dev, (unsigned long) wk,
1084 wk->chan, wk->chan_type,
1085 GFP_KERNEL);
1086
1087 return WORK_DONE_DESTROY;
1088 }
1089
1090 int ieee80211_wk_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1091 struct ieee80211_channel *chan,
1092 enum nl80211_channel_type channel_type,
1093 unsigned int duration, u64 *cookie)
1094 {
1095 struct ieee80211_work *wk;
1096
1097 wk = kzalloc(sizeof(*wk), GFP_KERNEL);
1098 if (!wk)
1099 return -ENOMEM;
1100
1101 wk->type = IEEE80211_WORK_REMAIN_ON_CHANNEL;
1102 wk->chan = chan;
1103 wk->chan_type = channel_type;
1104 wk->sdata = sdata;
1105 wk->done = ieee80211_remain_done;
1106
1107 wk->remain.duration = duration;
1108
1109 *cookie = (unsigned long) wk;
1110
1111 ieee80211_add_work(wk);
1112
1113 return 0;
1114 }
1115
1116 int ieee80211_wk_cancel_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1117 u64 cookie)
1118 {
1119 struct ieee80211_local *local = sdata->local;
1120 struct ieee80211_work *wk, *tmp;
1121 bool found = false;
1122
1123 mutex_lock(&local->work_mtx);
1124 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
1125 if ((unsigned long) wk == cookie) {
1126 wk->timeout = jiffies;
1127 found = true;
1128 break;
1129 }
1130 }
1131 mutex_unlock(&local->work_mtx);
1132
1133 if (!found)
1134 return -ENOENT;
1135
1136 ieee80211_queue_work(&local->hw, &local->work_work);
1137
1138 return 0;
1139 }
linux-next