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mac80211: give virtual interface to hw_scan
[deliverable/linux.git] / net / mac80211 / work.c
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, qos_info;
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 if (wk->assoc.uapsd_used) {
379 qos_info = local->uapsd_queues;
380 qos_info |= (local->uapsd_max_sp_len <<
381 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
382 } else {
383 qos_info = 0;
384 }
385
386 pos = skb_put(skb, 9);
387 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
388 *pos++ = 7; /* len */
389 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
390 *pos++ = 0x50;
391 *pos++ = 0xf2;
392 *pos++ = 2; /* WME */
393 *pos++ = 0; /* WME info */
394 *pos++ = 1; /* WME ver */
395 *pos++ = qos_info;
396 }
397
398 /* add any remaining custom (i.e. vendor specific here) IEs */
399 if (wk->ie_len && wk->ie) {
400 noffset = wk->ie_len;
401 pos = skb_put(skb, noffset - offset);
402 memcpy(pos, wk->ie + offset, noffset - offset);
403 }
404
405 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
406 ieee80211_tx_skb(sdata, skb);
407 }
408
409 static void ieee80211_remove_auth_bss(struct ieee80211_local *local,
410 struct ieee80211_work *wk)
411 {
412 struct cfg80211_bss *cbss;
413 u16 capa_val = WLAN_CAPABILITY_ESS;
414
415 if (wk->probe_auth.privacy)
416 capa_val |= WLAN_CAPABILITY_PRIVACY;
417
418 cbss = cfg80211_get_bss(local->hw.wiphy, wk->chan, wk->filter_ta,
419 wk->probe_auth.ssid, wk->probe_auth.ssid_len,
420 WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
421 capa_val);
422 if (!cbss)
423 return;
424
425 cfg80211_unlink_bss(local->hw.wiphy, cbss);
426 cfg80211_put_bss(cbss);
427 }
428
429 static enum work_action __must_check
430 ieee80211_direct_probe(struct ieee80211_work *wk)
431 {
432 struct ieee80211_sub_if_data *sdata = wk->sdata;
433 struct ieee80211_local *local = sdata->local;
434
435 wk->probe_auth.tries++;
436 if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
437 printk(KERN_DEBUG "%s: direct probe to %pM timed out\n",
438 sdata->name, wk->filter_ta);
439
440 /*
441 * Most likely AP is not in the range so remove the
442 * bss struct for that AP.
443 */
444 ieee80211_remove_auth_bss(local, wk);
445
446 return WORK_ACT_TIMEOUT;
447 }
448
449 printk(KERN_DEBUG "%s: direct probe to %pM (try %d)\n",
450 sdata->name, wk->filter_ta, wk->probe_auth.tries);
451
452 /*
453 * Direct probe is sent to broadcast address as some APs
454 * will not answer to direct packet in unassociated state.
455 */
456 ieee80211_send_probe_req(sdata, NULL, wk->probe_auth.ssid,
457 wk->probe_auth.ssid_len, NULL, 0);
458
459 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
460 run_again(local, wk->timeout);
461
462 return WORK_ACT_NONE;
463 }
464
465
466 static enum work_action __must_check
467 ieee80211_authenticate(struct ieee80211_work *wk)
468 {
469 struct ieee80211_sub_if_data *sdata = wk->sdata;
470 struct ieee80211_local *local = sdata->local;
471
472 wk->probe_auth.tries++;
473 if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
474 printk(KERN_DEBUG "%s: authentication with %pM"
475 " timed out\n", sdata->name, wk->filter_ta);
476
477 /*
478 * Most likely AP is not in the range so remove the
479 * bss struct for that AP.
480 */
481 ieee80211_remove_auth_bss(local, wk);
482
483 return WORK_ACT_TIMEOUT;
484 }
485
486 printk(KERN_DEBUG "%s: authenticate with %pM (try %d)\n",
487 sdata->name, wk->filter_ta, wk->probe_auth.tries);
488
489 ieee80211_send_auth(sdata, 1, wk->probe_auth.algorithm, wk->ie,
490 wk->ie_len, wk->filter_ta, NULL, 0, 0);
491 wk->probe_auth.transaction = 2;
492
493 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
494 run_again(local, wk->timeout);
495
496 return WORK_ACT_NONE;
497 }
498
499 static enum work_action __must_check
500 ieee80211_associate(struct ieee80211_work *wk)
501 {
502 struct ieee80211_sub_if_data *sdata = wk->sdata;
503 struct ieee80211_local *local = sdata->local;
504
505 wk->assoc.tries++;
506 if (wk->assoc.tries > IEEE80211_ASSOC_MAX_TRIES) {
507 printk(KERN_DEBUG "%s: association with %pM"
508 " timed out\n",
509 sdata->name, wk->filter_ta);
510
511 /*
512 * Most likely AP is not in the range so remove the
513 * bss struct for that AP.
514 */
515 if (wk->assoc.bss)
516 cfg80211_unlink_bss(local->hw.wiphy, wk->assoc.bss);
517
518 return WORK_ACT_TIMEOUT;
519 }
520
521 printk(KERN_DEBUG "%s: associate with %pM (try %d)\n",
522 sdata->name, wk->filter_ta, wk->assoc.tries);
523 ieee80211_send_assoc(sdata, wk);
524
525 wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
526 run_again(local, wk->timeout);
527
528 return WORK_ACT_NONE;
529 }
530
531 static enum work_action __must_check
532 ieee80211_remain_on_channel_timeout(struct ieee80211_work *wk)
533 {
534 /*
535 * First time we run, do nothing -- the generic code will
536 * have switched to the right channel etc.
537 */
538 if (!wk->started) {
539 wk->timeout = jiffies + msecs_to_jiffies(wk->remain.duration);
540
541 cfg80211_ready_on_channel(wk->sdata->dev, (unsigned long) wk,
542 wk->chan, wk->chan_type,
543 wk->remain.duration, GFP_KERNEL);
544
545 return WORK_ACT_NONE;
546 }
547
548 return WORK_ACT_TIMEOUT;
549 }
550
551 static void ieee80211_auth_challenge(struct ieee80211_work *wk,
552 struct ieee80211_mgmt *mgmt,
553 size_t len)
554 {
555 struct ieee80211_sub_if_data *sdata = wk->sdata;
556 u8 *pos;
557 struct ieee802_11_elems elems;
558
559 pos = mgmt->u.auth.variable;
560 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
561 if (!elems.challenge)
562 return;
563 ieee80211_send_auth(sdata, 3, wk->probe_auth.algorithm,
564 elems.challenge - 2, elems.challenge_len + 2,
565 wk->filter_ta, wk->probe_auth.key,
566 wk->probe_auth.key_len, wk->probe_auth.key_idx);
567 wk->probe_auth.transaction = 4;
568 }
569
570 static enum work_action __must_check
571 ieee80211_rx_mgmt_auth(struct ieee80211_work *wk,
572 struct ieee80211_mgmt *mgmt, size_t len)
573 {
574 u16 auth_alg, auth_transaction, status_code;
575
576 if (wk->type != IEEE80211_WORK_AUTH)
577 return WORK_ACT_NONE;
578
579 if (len < 24 + 6)
580 return WORK_ACT_NONE;
581
582 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
583 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
584 status_code = le16_to_cpu(mgmt->u.auth.status_code);
585
586 if (auth_alg != wk->probe_auth.algorithm ||
587 auth_transaction != wk->probe_auth.transaction)
588 return WORK_ACT_NONE;
589
590 if (status_code != WLAN_STATUS_SUCCESS) {
591 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
592 wk->sdata->name, mgmt->sa, status_code);
593 return WORK_ACT_DONE;
594 }
595
596 switch (wk->probe_auth.algorithm) {
597 case WLAN_AUTH_OPEN:
598 case WLAN_AUTH_LEAP:
599 case WLAN_AUTH_FT:
600 break;
601 case WLAN_AUTH_SHARED_KEY:
602 if (wk->probe_auth.transaction != 4) {
603 ieee80211_auth_challenge(wk, mgmt, len);
604 /* need another frame */
605 return WORK_ACT_NONE;
606 }
607 break;
608 default:
609 WARN_ON(1);
610 return WORK_ACT_NONE;
611 }
612
613 printk(KERN_DEBUG "%s: authenticated\n", wk->sdata->name);
614 return WORK_ACT_DONE;
615 }
616
617 static enum work_action __must_check
618 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_work *wk,
619 struct ieee80211_mgmt *mgmt, size_t len,
620 bool reassoc)
621 {
622 struct ieee80211_sub_if_data *sdata = wk->sdata;
623 struct ieee80211_local *local = sdata->local;
624 u16 capab_info, status_code, aid;
625 struct ieee802_11_elems elems;
626 u8 *pos;
627
628 /*
629 * AssocResp and ReassocResp have identical structure, so process both
630 * of them in this function.
631 */
632
633 if (len < 24 + 6)
634 return WORK_ACT_NONE;
635
636 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
637 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
638 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
639
640 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
641 "status=%d aid=%d)\n",
642 sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
643 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
644
645 pos = mgmt->u.assoc_resp.variable;
646 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
647
648 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
649 elems.timeout_int && elems.timeout_int_len == 5 &&
650 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
651 u32 tu, ms;
652 tu = get_unaligned_le32(elems.timeout_int + 1);
653 ms = tu * 1024 / 1000;
654 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
655 "comeback duration %u TU (%u ms)\n",
656 sdata->name, mgmt->sa, tu, ms);
657 wk->timeout = jiffies + msecs_to_jiffies(ms);
658 if (ms > IEEE80211_ASSOC_TIMEOUT)
659 run_again(local, wk->timeout);
660 return WORK_ACT_NONE;
661 }
662
663 if (status_code != WLAN_STATUS_SUCCESS)
664 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
665 sdata->name, mgmt->sa, status_code);
666 else
667 printk(KERN_DEBUG "%s: associated\n", sdata->name);
668
669 return WORK_ACT_DONE;
670 }
671
672 static enum work_action __must_check
673 ieee80211_rx_mgmt_probe_resp(struct ieee80211_work *wk,
674 struct ieee80211_mgmt *mgmt, size_t len,
675 struct ieee80211_rx_status *rx_status)
676 {
677 struct ieee80211_sub_if_data *sdata = wk->sdata;
678 struct ieee80211_local *local = sdata->local;
679 size_t baselen;
680
681 ASSERT_WORK_MTX(local);
682
683 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
684 if (baselen > len)
685 return WORK_ACT_NONE;
686
687 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
688 return WORK_ACT_DONE;
689 }
690
691 static void ieee80211_work_rx_queued_mgmt(struct ieee80211_local *local,
692 struct sk_buff *skb)
693 {
694 struct ieee80211_rx_status *rx_status;
695 struct ieee80211_mgmt *mgmt;
696 struct ieee80211_work *wk;
697 enum work_action rma = WORK_ACT_NONE;
698 u16 fc;
699
700 rx_status = (struct ieee80211_rx_status *) skb->cb;
701 mgmt = (struct ieee80211_mgmt *) skb->data;
702 fc = le16_to_cpu(mgmt->frame_control);
703
704 mutex_lock(&local->work_mtx);
705
706 list_for_each_entry(wk, &local->work_list, list) {
707 const u8 *bssid = NULL;
708
709 switch (wk->type) {
710 case IEEE80211_WORK_DIRECT_PROBE:
711 case IEEE80211_WORK_AUTH:
712 case IEEE80211_WORK_ASSOC:
713 bssid = wk->filter_ta;
714 break;
715 default:
716 continue;
717 }
718
719 /*
720 * Before queuing, we already verified mgmt->sa,
721 * so this is needed just for matching.
722 */
723 if (compare_ether_addr(bssid, mgmt->bssid))
724 continue;
725
726 switch (fc & IEEE80211_FCTL_STYPE) {
727 case IEEE80211_STYPE_PROBE_RESP:
728 rma = ieee80211_rx_mgmt_probe_resp(wk, mgmt, skb->len,
729 rx_status);
730 break;
731 case IEEE80211_STYPE_AUTH:
732 rma = ieee80211_rx_mgmt_auth(wk, mgmt, skb->len);
733 break;
734 case IEEE80211_STYPE_ASSOC_RESP:
735 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
736 skb->len, false);
737 break;
738 case IEEE80211_STYPE_REASSOC_RESP:
739 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
740 skb->len, true);
741 break;
742 default:
743 WARN_ON(1);
744 }
745 /*
746 * We've processed this frame for that work, so it can't
747 * belong to another work struct.
748 * NB: this is also required for correctness for 'rma'!
749 */
750 break;
751 }
752
753 switch (rma) {
754 case WORK_ACT_NONE:
755 break;
756 case WORK_ACT_DONE:
757 list_del_rcu(&wk->list);
758 break;
759 default:
760 WARN(1, "unexpected: %d", rma);
761 }
762
763 mutex_unlock(&local->work_mtx);
764
765 if (rma != WORK_ACT_DONE)
766 goto out;
767
768 switch (wk->done(wk, skb)) {
769 case WORK_DONE_DESTROY:
770 free_work(wk);
771 break;
772 case WORK_DONE_REQUEUE:
773 synchronize_rcu();
774 wk->started = false; /* restart */
775 mutex_lock(&local->work_mtx);
776 list_add_tail(&wk->list, &local->work_list);
777 mutex_unlock(&local->work_mtx);
778 }
779
780 out:
781 kfree_skb(skb);
782 }
783
784 static void ieee80211_work_timer(unsigned long data)
785 {
786 struct ieee80211_local *local = (void *) data;
787
788 if (local->quiescing)
789 return;
790
791 ieee80211_queue_work(&local->hw, &local->work_work);
792 }
793
794 static void ieee80211_work_work(struct work_struct *work)
795 {
796 struct ieee80211_local *local =
797 container_of(work, struct ieee80211_local, work_work);
798 struct sk_buff *skb;
799 struct ieee80211_work *wk, *tmp;
800 LIST_HEAD(free_work);
801 enum work_action rma;
802 bool remain_off_channel = false;
803
804 if (local->scanning)
805 return;
806
807 /*
808 * ieee80211_queue_work() should have picked up most cases,
809 * here we'll pick the the rest.
810 */
811 if (WARN(local->suspended, "work scheduled while going to suspend\n"))
812 return;
813
814 /* first process frames to avoid timing out while a frame is pending */
815 while ((skb = skb_dequeue(&local->work_skb_queue)))
816 ieee80211_work_rx_queued_mgmt(local, skb);
817
818 ieee80211_recalc_idle(local);
819
820 mutex_lock(&local->work_mtx);
821
822 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
823 bool started = wk->started;
824
825 /* mark work as started if it's on the current off-channel */
826 if (!started && local->tmp_channel &&
827 wk->chan == local->tmp_channel &&
828 wk->chan_type == local->tmp_channel_type) {
829 started = true;
830 wk->timeout = jiffies;
831 }
832
833 if (!started && !local->tmp_channel) {
834 /*
835 * TODO: could optimize this by leaving the
836 * station vifs in awake mode if they
837 * happen to be on the same channel as
838 * the requested channel
839 */
840 ieee80211_offchannel_stop_beaconing(local);
841 ieee80211_offchannel_stop_station(local);
842
843 local->tmp_channel = wk->chan;
844 local->tmp_channel_type = wk->chan_type;
845 ieee80211_hw_config(local, 0);
846 started = true;
847 wk->timeout = jiffies;
848 }
849
850 /* don't try to work with items that aren't started */
851 if (!started)
852 continue;
853
854 if (time_is_after_jiffies(wk->timeout)) {
855 /*
856 * This work item isn't supposed to be worked on
857 * right now, but take care to adjust the timer
858 * properly.
859 */
860 run_again(local, wk->timeout);
861 continue;
862 }
863
864 switch (wk->type) {
865 default:
866 WARN_ON(1);
867 /* nothing */
868 rma = WORK_ACT_NONE;
869 break;
870 case IEEE80211_WORK_ABORT:
871 rma = WORK_ACT_TIMEOUT;
872 break;
873 case IEEE80211_WORK_DIRECT_PROBE:
874 rma = ieee80211_direct_probe(wk);
875 break;
876 case IEEE80211_WORK_AUTH:
877 rma = ieee80211_authenticate(wk);
878 break;
879 case IEEE80211_WORK_ASSOC:
880 rma = ieee80211_associate(wk);
881 break;
882 case IEEE80211_WORK_REMAIN_ON_CHANNEL:
883 rma = ieee80211_remain_on_channel_timeout(wk);
884 break;
885 }
886
887 wk->started = started;
888
889 switch (rma) {
890 case WORK_ACT_NONE:
891 /* might have changed the timeout */
892 run_again(local, wk->timeout);
893 break;
894 case WORK_ACT_TIMEOUT:
895 list_del_rcu(&wk->list);
896 synchronize_rcu();
897 list_add(&wk->list, &free_work);
898 break;
899 default:
900 WARN(1, "unexpected: %d", rma);
901 }
902 }
903
904 list_for_each_entry(wk, &local->work_list, list) {
905 if (!wk->started)
906 continue;
907 if (wk->chan != local->tmp_channel)
908 continue;
909 if (wk->chan_type != local->tmp_channel_type)
910 continue;
911 remain_off_channel = true;
912 }
913
914 if (!remain_off_channel && local->tmp_channel) {
915 local->tmp_channel = NULL;
916 ieee80211_hw_config(local, 0);
917 ieee80211_offchannel_return(local, true);
918 /* give connection some time to breathe */
919 run_again(local, jiffies + HZ/2);
920 }
921
922 mutex_lock(&local->scan_mtx);
923
924 if (list_empty(&local->work_list) && local->scan_req &&
925 !local->scanning)
926 ieee80211_queue_delayed_work(&local->hw,
927 &local->scan_work,
928 round_jiffies_relative(0));
929
930 mutex_unlock(&local->scan_mtx);
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 if (WARN_ON(!ieee80211_sdata_running(wk->sdata)))
957 return;
958
959 wk->started = false;
960
961 local = wk->sdata->local;
962 mutex_lock(&local->work_mtx);
963 list_add_tail(&wk->list, &local->work_list);
964 mutex_unlock(&local->work_mtx);
965
966 ieee80211_queue_work(&local->hw, &local->work_work);
967 }
968
969 void ieee80211_work_init(struct ieee80211_local *local)
970 {
971 mutex_init(&local->work_mtx);
972 INIT_LIST_HEAD(&local->work_list);
973 setup_timer(&local->work_timer, ieee80211_work_timer,
974 (unsigned long)local);
975 INIT_WORK(&local->work_work, ieee80211_work_work);
976 skb_queue_head_init(&local->work_skb_queue);
977 }
978
979 void ieee80211_work_purge(struct ieee80211_sub_if_data *sdata)
980 {
981 struct ieee80211_local *local = sdata->local;
982 struct ieee80211_work *wk;
983
984 mutex_lock(&local->work_mtx);
985 list_for_each_entry(wk, &local->work_list, list) {
986 if (wk->sdata != sdata)
987 continue;
988 wk->type = IEEE80211_WORK_ABORT;
989 wk->started = true;
990 wk->timeout = jiffies;
991 }
992 mutex_unlock(&local->work_mtx);
993
994 /* run cleanups etc. */
995 ieee80211_work_work(&local->work_work);
996
997 mutex_lock(&local->work_mtx);
998 list_for_each_entry(wk, &local->work_list, list) {
999 if (wk->sdata != sdata)
1000 continue;
1001 WARN_ON(1);
1002 break;
1003 }
1004 mutex_unlock(&local->work_mtx);
1005 }
1006
1007 ieee80211_rx_result ieee80211_work_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1008 struct sk_buff *skb)
1009 {
1010 struct ieee80211_local *local = sdata->local;
1011 struct ieee80211_mgmt *mgmt;
1012 struct ieee80211_work *wk;
1013 u16 fc;
1014
1015 if (skb->len < 24)
1016 return RX_DROP_MONITOR;
1017
1018 mgmt = (struct ieee80211_mgmt *) skb->data;
1019 fc = le16_to_cpu(mgmt->frame_control);
1020
1021 list_for_each_entry_rcu(wk, &local->work_list, list) {
1022 if (sdata != wk->sdata)
1023 continue;
1024 if (compare_ether_addr(wk->filter_ta, mgmt->sa))
1025 continue;
1026 if (compare_ether_addr(wk->filter_ta, mgmt->bssid))
1027 continue;
1028
1029 switch (fc & IEEE80211_FCTL_STYPE) {
1030 case IEEE80211_STYPE_AUTH:
1031 case IEEE80211_STYPE_PROBE_RESP:
1032 case IEEE80211_STYPE_ASSOC_RESP:
1033 case IEEE80211_STYPE_REASSOC_RESP:
1034 skb_queue_tail(&local->work_skb_queue, skb);
1035 ieee80211_queue_work(&local->hw, &local->work_work);
1036 return RX_QUEUED;
1037 }
1038 }
1039
1040 return RX_CONTINUE;
1041 }
1042
1043 static enum work_done_result ieee80211_remain_done(struct ieee80211_work *wk,
1044 struct sk_buff *skb)
1045 {
1046 /*
1047 * We are done serving the remain-on-channel command.
1048 */
1049 cfg80211_remain_on_channel_expired(wk->sdata->dev, (unsigned long) wk,
1050 wk->chan, wk->chan_type,
1051 GFP_KERNEL);
1052
1053 return WORK_DONE_DESTROY;
1054 }
1055
1056 int ieee80211_wk_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1057 struct ieee80211_channel *chan,
1058 enum nl80211_channel_type channel_type,
1059 unsigned int duration, u64 *cookie)
1060 {
1061 struct ieee80211_work *wk;
1062
1063 wk = kzalloc(sizeof(*wk), GFP_KERNEL);
1064 if (!wk)
1065 return -ENOMEM;
1066
1067 wk->type = IEEE80211_WORK_REMAIN_ON_CHANNEL;
1068 wk->chan = chan;
1069 wk->chan_type = channel_type;
1070 wk->sdata = sdata;
1071 wk->done = ieee80211_remain_done;
1072
1073 wk->remain.duration = duration;
1074
1075 *cookie = (unsigned long) wk;
1076
1077 ieee80211_add_work(wk);
1078
1079 return 0;
1080 }
1081
1082 int ieee80211_wk_cancel_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1083 u64 cookie)
1084 {
1085 struct ieee80211_local *local = sdata->local;
1086 struct ieee80211_work *wk, *tmp;
1087 bool found = false;
1088
1089 mutex_lock(&local->work_mtx);
1090 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
1091 if ((unsigned long) wk == cookie) {
1092 wk->timeout = jiffies;
1093 found = true;
1094 break;
1095 }
1096 }
1097 mutex_unlock(&local->work_mtx);
1098
1099 if (!found)
1100 return -ENOENT;
1101
1102 ieee80211_queue_work(&local->hw, &local->work_work);
1103
1104 return 0;
1105 }
Linux kernel - Deliverables
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