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cfg80211: add remain-on-channel command
[net-next-2.6.git] / net / mac80211 / work.c
CommitLineData
af6b6374
JB		 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
34enum work_action {
35 WORK_ACT_NONE,
36 WORK_ACT_TIMEOUT,
37 WORK_ACT_DONE,
38};
39
40
41/* utils */
42static 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 */
57static 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
67static 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
75void free_work(struct ieee80211_work *wk)
76{
77 call_rcu(&wk->rcu_head, work_free_rcu);
78}
79
80static 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
77c8144a
JB		 103static 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
af6b6374
JB		 199static 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;
77c8144a 206 const u8 *ies;
8e664fb3 207 size_t offset = 0, noffset;
af6b6374
JB		 208 int i, len, count, rates_len, supp_rates_len;
209 u16 capab;
210 struct ieee80211_supported_band *sband;
211 u32 rates = 0;
212
77c8144a
JB		 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);
af6b6374
JB		 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
af6b6374
JB		 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
af6b6374
JB		 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 */
77c8144a 327 *pos++ = wk->chan->max_power; /* max tx power */
af6b6374
JB		 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
8e664fb3 341 /* if present, add any custom IEs that go before HT */
af6b6374 342 if (wk->ie_len && wk->ie) {
8e664fb3
JB		 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;
af6b6374
JB		 361 }
362
77c8144a
JB		 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
8e664fb3
JB		 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
af6b6374
JB		 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
8e664fb3
JB		 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
af6b6374
JB		 397 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
398 ieee80211_tx_skb(sdata, skb);
399}
400
401static 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
421static enum work_action __must_check
422ieee80211_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) {
7d3a1c3b 429 printk(KERN_DEBUG "%s: direct probe to %pM timed out\n",
af6b6374
JB		 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
7d3a1c3b 447 printk(KERN_DEBUG "%s: direct probe to %pM (try %d)\n",
af6b6374
JB		 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
464static enum work_action __must_check
465ieee80211_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) {
7d3a1c3b 472 printk(KERN_DEBUG "%s: authentication with %pM"
af6b6374
JB		 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
7d3a1c3b 490 printk(KERN_DEBUG "%s: authenticate with %pM (try %d)\n",
af6b6374
JB		 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
503static enum work_action __must_check
504ieee80211_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) {
7d3a1c3b 511 printk(KERN_DEBUG "%s: association with %pM"
af6b6374
JB		 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)
0c1ad2ca 520 cfg80211_unlink_bss(local->hw.wiphy, wk->assoc.bss);
af6b6374
JB		 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
7d3a1c3b 531 printk(KERN_DEBUG "%s: associate with %pM (try %d)\n",
af6b6374
JB		 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
541static void ieee80211_auth_challenge(struct ieee80211_work *wk,
542 struct ieee80211_mgmt *mgmt,
543 size_t len)
544{
545 struct ieee80211_sub_if_data *sdata = wk->sdata;
546 u8 *pos;
547 struct ieee802_11_elems elems;
548
549 pos = mgmt->u.auth.variable;
550 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
551 if (!elems.challenge)
552 return;
553 ieee80211_send_auth(sdata, 3, wk->probe_auth.algorithm,
554 elems.challenge - 2, elems.challenge_len + 2,
555 wk->filter_ta, wk->probe_auth.key,
556 wk->probe_auth.key_len, wk->probe_auth.key_idx);
557 wk->probe_auth.transaction = 4;
558}
559
560static enum work_action __must_check
561ieee80211_rx_mgmt_auth(struct ieee80211_work *wk,
562 struct ieee80211_mgmt *mgmt, size_t len)
563{
564 u16 auth_alg, auth_transaction, status_code;
565
566 if (wk->type != IEEE80211_WORK_AUTH)
567 return WORK_ACT_NONE;
568
569 if (len < 24 + 6)
570 return WORK_ACT_NONE;
571
572 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
573 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
574 status_code = le16_to_cpu(mgmt->u.auth.status_code);
575
576 if (auth_alg != wk->probe_auth.algorithm ||
577 auth_transaction != wk->probe_auth.transaction)
578 return WORK_ACT_NONE;
579
580 if (status_code != WLAN_STATUS_SUCCESS) {
581 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
582 wk->sdata->name, mgmt->sa, status_code);
583 return WORK_ACT_DONE;
584 }
585
586 switch (wk->probe_auth.algorithm) {
587 case WLAN_AUTH_OPEN:
588 case WLAN_AUTH_LEAP:
589 case WLAN_AUTH_FT:
590 break;
591 case WLAN_AUTH_SHARED_KEY:
592 if (wk->probe_auth.transaction != 4) {
593 ieee80211_auth_challenge(wk, mgmt, len);
594 /* need another frame */
595 return WORK_ACT_NONE;
596 }
597 break;
598 default:
599 WARN_ON(1);
600 return WORK_ACT_NONE;
601 }
602
603 printk(KERN_DEBUG "%s: authenticated\n", wk->sdata->name);
604 return WORK_ACT_DONE;
605}
606
607static enum work_action __must_check
608ieee80211_rx_mgmt_assoc_resp(struct ieee80211_work *wk,
609 struct ieee80211_mgmt *mgmt, size_t len,
610 bool reassoc)
611{
612 struct ieee80211_sub_if_data *sdata = wk->sdata;
613 struct ieee80211_local *local = sdata->local;
614 u16 capab_info, status_code, aid;
615 struct ieee802_11_elems elems;
616 u8 *pos;
617
618 /*
619 * AssocResp and ReassocResp have identical structure, so process both
620 * of them in this function.
621 */
622
623 if (len < 24 + 6)
624 return WORK_ACT_NONE;
625
626 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
627 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
628 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
629
630 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
631 "status=%d aid=%d)\n",
632 sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
633 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
634
635 pos = mgmt->u.assoc_resp.variable;
636 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
637
638 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
639 elems.timeout_int && elems.timeout_int_len == 5 &&
640 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
641 u32 tu, ms;
642 tu = get_unaligned_le32(elems.timeout_int + 1);
643 ms = tu * 1024 / 1000;
7d3a1c3b 644 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
af6b6374 645 "comeback duration %u TU (%u ms)\n",
7d3a1c3b 646 sdata->name, mgmt->sa, tu, ms);
af6b6374
JB		 647 wk->timeout = jiffies + msecs_to_jiffies(ms);
648 if (ms > IEEE80211_ASSOC_TIMEOUT)
649 run_again(local, wk->timeout);
650 return WORK_ACT_NONE;
651 }
652
653 if (status_code != WLAN_STATUS_SUCCESS)
7d3a1c3b
JB		 654 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
655 sdata->name, mgmt->sa, status_code);
af6b6374
JB		 656 else
657 printk(KERN_DEBUG "%s: associated\n", sdata->name);
658
659 return WORK_ACT_DONE;
660}
661
662static enum work_action __must_check
663ieee80211_rx_mgmt_probe_resp(struct ieee80211_work *wk,
664 struct ieee80211_mgmt *mgmt, size_t len,
665 struct ieee80211_rx_status *rx_status)
666{
667 struct ieee80211_sub_if_data *sdata = wk->sdata;
668 struct ieee80211_local *local = sdata->local;
669 size_t baselen;
670
671 ASSERT_WORK_MTX(local);
672
673 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
674 if (baselen > len)
675 return WORK_ACT_NONE;
676
677 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
678 return WORK_ACT_DONE;
679}
680
681static void ieee80211_work_rx_queued_mgmt(struct ieee80211_local *local,
682 struct sk_buff *skb)
683{
684 struct ieee80211_rx_status *rx_status;
685 struct ieee80211_mgmt *mgmt;
686 struct ieee80211_work *wk;
687 enum work_action rma = WORK_ACT_NONE;
688 u16 fc;
689
690 rx_status = (struct ieee80211_rx_status *) skb->cb;
691 mgmt = (struct ieee80211_mgmt *) skb->data;
692 fc = le16_to_cpu(mgmt->frame_control);
693
694 mutex_lock(&local->work_mtx);
695
696 list_for_each_entry(wk, &local->work_list, list) {
697 const u8 *bssid = NULL;
698
699 switch (wk->type) {
700 case IEEE80211_WORK_DIRECT_PROBE:
701 case IEEE80211_WORK_AUTH:
702 case IEEE80211_WORK_ASSOC:
703 bssid = wk->filter_ta;
704 break;
705 default:
706 continue;
707 }
708
709 /*
710 * Before queuing, we already verified mgmt->sa,
711 * so this is needed just for matching.
712 */
713 if (compare_ether_addr(bssid, mgmt->bssid))
714 continue;
715
716 switch (fc & IEEE80211_FCTL_STYPE) {
717 case IEEE80211_STYPE_PROBE_RESP:
718 rma = ieee80211_rx_mgmt_probe_resp(wk, mgmt, skb->len,
719 rx_status);
720 break;
721 case IEEE80211_STYPE_AUTH:
722 rma = ieee80211_rx_mgmt_auth(wk, mgmt, skb->len);
723 break;
724 case IEEE80211_STYPE_ASSOC_RESP:
725 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
726 skb->len, false);
727 break;
728 case IEEE80211_STYPE_REASSOC_RESP:
729 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
730 skb->len, true);
731 break;
732 default:
733 WARN_ON(1);
734 }
735 /*
736 * We've processed this frame for that work, so it can't
737 * belong to another work struct.
738 * NB: this is also required for correctness for 'rma'!
739 */
740 break;
741 }
742
743 switch (rma) {
744 case WORK_ACT_NONE:
745 break;
746 case WORK_ACT_DONE:
747 list_del_rcu(&wk->list);
748 break;
749 default:
750 WARN(1, "unexpected: %d", rma);
751 }
752
753 mutex_unlock(&local->work_mtx);
754
755 if (rma != WORK_ACT_DONE)
756 goto out;
757
758 switch (wk->done(wk, skb)) {
759 case WORK_DONE_DESTROY:
760 free_work(wk);
761 break;
762 case WORK_DONE_REQUEUE:
763 synchronize_rcu();
764 wk->timeout = jiffies; /* run again directly */
765 mutex_lock(&local->work_mtx);
766 list_add_tail(&wk->list, &local->work_list);
767 mutex_unlock(&local->work_mtx);
768 }
769
770 out:
771 kfree_skb(skb);
772}
773
774static void ieee80211_work_timer(unsigned long data)
775{
776 struct ieee80211_local *local = (void *) data;
777
778 if (local->quiescing)
779 return;
780
781 ieee80211_queue_work(&local->hw, &local->work_work);
782}
783
784static void ieee80211_work_work(struct work_struct *work)
785{
786 struct ieee80211_local *local =
787 container_of(work, struct ieee80211_local, work_work);
788 struct sk_buff *skb;
789 struct ieee80211_work *wk, *tmp;
790 LIST_HEAD(free_work);
791 enum work_action rma;
792
793 if (local->scanning)
794 return;
795
796 /*
797 * ieee80211_queue_work() should have picked up most cases,
798 * here we'll pick the the rest.
799 */
800 if (WARN(local->suspended, "work scheduled while going to suspend\n"))
801 return;
802
803 /* first process frames to avoid timing out while a frame is pending */
804 while ((skb = skb_dequeue(&local->work_skb_queue)))
805 ieee80211_work_rx_queued_mgmt(local, skb);
806
807 ieee80211_recalc_idle(local);
808
809 mutex_lock(&local->work_mtx);
810
811 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
812 if (time_is_after_jiffies(wk->timeout)) {
813 /*
814 * This work item isn't supposed to be worked on
815 * right now, but take care to adjust the timer
816 * properly.
817 */
818 run_again(local, wk->timeout);
819 continue;
820 }
821
822 switch (wk->type) {
823 default:
824 WARN_ON(1);
825 /* nothing */
826 rma = WORK_ACT_NONE;
827 break;
828 case IEEE80211_WORK_DIRECT_PROBE:
829 rma = ieee80211_direct_probe(wk);
830 break;
831 case IEEE80211_WORK_AUTH:
832 rma = ieee80211_authenticate(wk);
833 break;
834 case IEEE80211_WORK_ASSOC:
835 rma = ieee80211_associate(wk);
836 break;
837 }
838
839 switch (rma) {
840 case WORK_ACT_NONE:
841 /* no action required */
842 break;
843 case WORK_ACT_TIMEOUT:
844 list_del_rcu(&wk->list);
845 synchronize_rcu();
846 list_add(&wk->list, &free_work);
847 break;
848 default:
849 WARN(1, "unexpected: %d", rma);
850 }
851 }
852
853 if (list_empty(&local->work_list) && local->scan_req)
854 ieee80211_queue_delayed_work(&local->hw,
855 &local->scan_work,
856 round_jiffies_relative(0));
857
858 mutex_unlock(&local->work_mtx);
859
860 list_for_each_entry_safe(wk, tmp, &free_work, list) {
861 wk->done(wk, NULL);
862 list_del(&wk->list);
863 kfree(wk);
864 }
865}
866
867void ieee80211_add_work(struct ieee80211_work *wk)
868{
869 struct ieee80211_local *local;
870
871 if (WARN_ON(!wk->chan))
872 return;
873
874 if (WARN_ON(!wk->sdata))
875 return;
876
877 if (WARN_ON(!wk->done))
878 return;
879
880 wk->timeout = jiffies;
881
882 local = wk->sdata->local;
883 mutex_lock(&local->work_mtx);
884 list_add_tail(&wk->list, &local->work_list);
885 mutex_unlock(&local->work_mtx);
886
887 ieee80211_queue_work(&local->hw, &local->work_work);
888}
889
890void ieee80211_work_init(struct ieee80211_local *local)
891{
892 mutex_init(&local->work_mtx);
893 INIT_LIST_HEAD(&local->work_list);
894 setup_timer(&local->work_timer, ieee80211_work_timer,
895 (unsigned long)local);
896 INIT_WORK(&local->work_work, ieee80211_work_work);
897 skb_queue_head_init(&local->work_skb_queue);
898}
899
900void ieee80211_work_purge(struct ieee80211_sub_if_data *sdata)
901{
902 struct ieee80211_local *local = sdata->local;
903 struct ieee80211_work *wk, *tmp;
904
905 mutex_lock(&local->work_mtx);
906 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
907 if (wk->sdata != sdata)
908 continue;
909 list_del(&wk->list);
910 free_work(wk);
911 }
912 mutex_unlock(&local->work_mtx);
913}
914
915ieee80211_rx_result ieee80211_work_rx_mgmt(struct ieee80211_sub_if_data *sdata,
916 struct sk_buff *skb)
917{
918 struct ieee80211_local *local = sdata->local;
919 struct ieee80211_mgmt *mgmt;
920 struct ieee80211_work *wk;
921 u16 fc;
922
923 if (skb->len < 24)
924 return RX_DROP_MONITOR;
925
926 mgmt = (struct ieee80211_mgmt *) skb->data;
927 fc = le16_to_cpu(mgmt->frame_control);
928
929 list_for_each_entry_rcu(wk, &local->work_list, list) {
930 if (sdata != wk->sdata)
931 continue;
932 if (compare_ether_addr(wk->filter_ta, mgmt->sa))
933 continue;
934 if (compare_ether_addr(wk->filter_ta, mgmt->bssid))
935 continue;
936
937 switch (fc & IEEE80211_FCTL_STYPE) {
938 case IEEE80211_STYPE_AUTH:
939 case IEEE80211_STYPE_PROBE_RESP:
940 case IEEE80211_STYPE_ASSOC_RESP:
941 case IEEE80211_STYPE_REASSOC_RESP:
942 case IEEE80211_STYPE_DEAUTH:
943 case IEEE80211_STYPE_DISASSOC:
944 skb_queue_tail(&local->work_skb_queue, skb);
945 ieee80211_queue_work(&local->hw, &local->work_work);
946 return RX_QUEUED;
947 }
948 }
949
950 return RX_CONTINUE;
951}
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