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[linux.git] / net / mac80211 / work.c
CommitLineData
af6b6374
JB		 1/*
2 * mac80211 work implementation
3 *
4 * Copyright 2003-2008, Jouni Malinen <[email protected]>
5 * Copyright 2004, Instant802 Networks, Inc.
6 * Copyright 2005, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <[email protected]>
8 * Copyright 2007, Michael Wu <[email protected]>
9 * Copyright 2009, Johannes Berg <[email protected]>
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>
5a0e3ad6 22#include <linux/slab.h>
af6b6374
JB		 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
35enum work_action {
b8d92c9c 36 WORK_ACT_MISMATCH,
af6b6374
JB		 37 WORK_ACT_NONE,
38 WORK_ACT_TIMEOUT,
39 WORK_ACT_DONE,
40};
41
42
43/* utils */
44static 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 */
59static 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
69static 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
77void free_work(struct ieee80211_work *wk)
78{
79 call_rcu(&wk->rcu_head, work_free_rcu);
80}
81
82static 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
77c8144a
JB		 105static 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
af6b6374
JB		 201static 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;
ab13315a 207 u8 *pos, qos_info;
77c8144a 208 const u8 *ies;
8e664fb3 209 size_t offset = 0, noffset;
af6b6374
JB		 210 int i, len, count, rates_len, supp_rates_len;
211 u16 capab;
212 struct ieee80211_supported_band *sband;
213 u32 rates = 0;
214
77c8144a
JB		 215 sband = local->hw.wiphy->bands[wk->chan->band];
216
76f27364
SG		 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 }
77c8144a
JB		 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);
af6b6374
JB		 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
af6b6374
JB		 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
af6b6374
JB		 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 */
77c8144a 339 *pos++ = wk->chan->max_power; /* max tx power */
af6b6374
JB		 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
8e664fb3 353 /* if present, add any custom IEs that go before HT */
af6b6374 354 if (wk->ie_len && wk->ie) {
8e664fb3
JB		 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;
af6b6374
JB		 373 }
374
77c8144a
JB		 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
8e664fb3
JB		 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
af6b6374 389 if (wk->assoc.wmm_used && local->hw.queues >= 4) {
ab13315a 390 if (wk->assoc.uapsd_used) {
50ae0cf1
KV		 391 qos_info = local->uapsd_queues;
392 qos_info |= (local->uapsd_max_sp_len <<
ab13315a
KV		 393 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
394 } else {
395 qos_info = 0;
396 }
397
af6b6374
JB		 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 */
ab13315a 407 *pos++ = qos_info;
af6b6374
JB		 408 }
409
8e664fb3
JB		 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
af6b6374
JB		 417 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
418 ieee80211_tx_skb(sdata, skb);
419}
420
421static 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
441static enum work_action __must_check
442ieee80211_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) {
7d3a1c3b 449 printk(KERN_DEBUG "%s: direct probe to %pM timed out\n",
af6b6374
JB		 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
af6b6374
JB		 458 return WORK_ACT_TIMEOUT;
459 }
460
7d3a1c3b 461 printk(KERN_DEBUG "%s: direct probe to %pM (try %d)\n",
af6b6374
JB		 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
478static enum work_action __must_check
479ieee80211_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) {
7d3a1c3b 486 printk(KERN_DEBUG "%s: authentication with %pM"
af6b6374
JB		 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
af6b6374
JB		 495 return WORK_ACT_TIMEOUT;
496 }
497
7d3a1c3b 498 printk(KERN_DEBUG "%s: authenticate with %pM (try %d)\n",
af6b6374
JB		 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
511static enum work_action __must_check
512ieee80211_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) {
7d3a1c3b 519 printk(KERN_DEBUG "%s: association with %pM"
af6b6374
JB		 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)
0c1ad2ca 528 cfg80211_unlink_bss(local->hw.wiphy, wk->assoc.bss);
af6b6374 529
af6b6374
JB		 530 return WORK_ACT_TIMEOUT;
531 }
532
7d3a1c3b 533 printk(KERN_DEBUG "%s: associate with %pM (try %d)\n",
af6b6374
JB		 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
b8bc4b0a
JB		 543static enum work_action __must_check
544ieee80211_remain_on_channel_timeout(struct ieee80211_work *wk)
545{
b8bc4b0a
JB		 546 /*
547 * First time we run, do nothing -- the generic code will
548 * have switched to the right channel etc.
549 */
723bae7e 550 if (!wk->started) {
e4da8c37 551 wk->timeout = jiffies + msecs_to_jiffies(wk->remain.duration);
b8bc4b0a 552
1990ca61
KV		 553 cfg80211_ready_on_channel(wk->sdata->dev, (unsigned long) wk,
554 wk->chan, wk->chan_type,
555 wk->remain.duration, GFP_KERNEL);
b8bc4b0a 556
e4da8c37 557 return WORK_ACT_NONE;
b8bc4b0a
JB		 558 }
559
e4da8c37 560 return WORK_ACT_TIMEOUT;
b8bc4b0a
JB		 561}
562
e5b900d2
JB		 563static enum work_action __must_check
564ieee80211_assoc_beacon_wait(struct ieee80211_work *wk)
565{
566 if (wk->started)
567 return WORK_ACT_TIMEOUT;
568
569 /*
570 * Wait up to one beacon interval ...
571 * should this be more if we miss one?
572 */
573 printk(KERN_DEBUG "%s: waiting for beacon from %pM\n",
574 wk->sdata->name, wk->filter_ta);
575 wk->timeout = TU_TO_EXP_TIME(wk->assoc.bss->beacon_interval);
576 return WORK_ACT_NONE;
577}
578
af6b6374
JB		 579static void ieee80211_auth_challenge(struct ieee80211_work *wk,
580 struct ieee80211_mgmt *mgmt,
581 size_t len)
582{
583 struct ieee80211_sub_if_data *sdata = wk->sdata;
584 u8 *pos;
585 struct ieee802_11_elems elems;
586
587 pos = mgmt->u.auth.variable;
588 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
589 if (!elems.challenge)
590 return;
591 ieee80211_send_auth(sdata, 3, wk->probe_auth.algorithm,
592 elems.challenge - 2, elems.challenge_len + 2,
593 wk->filter_ta, wk->probe_auth.key,
594 wk->probe_auth.key_len, wk->probe_auth.key_idx);
595 wk->probe_auth.transaction = 4;
596}
597
598static enum work_action __must_check
599ieee80211_rx_mgmt_auth(struct ieee80211_work *wk,
600 struct ieee80211_mgmt *mgmt, size_t len)
601{
602 u16 auth_alg, auth_transaction, status_code;
603
604 if (wk->type != IEEE80211_WORK_AUTH)
b8d92c9c 605 return WORK_ACT_MISMATCH;
af6b6374
JB		 606
607 if (len < 24 + 6)
608 return WORK_ACT_NONE;
609
610 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
611 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
612 status_code = le16_to_cpu(mgmt->u.auth.status_code);
613
614 if (auth_alg != wk->probe_auth.algorithm ||
615 auth_transaction != wk->probe_auth.transaction)
616 return WORK_ACT_NONE;
617
618 if (status_code != WLAN_STATUS_SUCCESS) {
619 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
620 wk->sdata->name, mgmt->sa, status_code);
621 return WORK_ACT_DONE;
622 }
623
624 switch (wk->probe_auth.algorithm) {
625 case WLAN_AUTH_OPEN:
626 case WLAN_AUTH_LEAP:
627 case WLAN_AUTH_FT:
628 break;
629 case WLAN_AUTH_SHARED_KEY:
630 if (wk->probe_auth.transaction != 4) {
631 ieee80211_auth_challenge(wk, mgmt, len);
632 /* need another frame */
633 return WORK_ACT_NONE;
634 }
635 break;
636 default:
637 WARN_ON(1);
638 return WORK_ACT_NONE;
639 }
640
641 printk(KERN_DEBUG "%s: authenticated\n", wk->sdata->name);
642 return WORK_ACT_DONE;
643}
644
645static enum work_action __must_check
646ieee80211_rx_mgmt_assoc_resp(struct ieee80211_work *wk,
647 struct ieee80211_mgmt *mgmt, size_t len,
648 bool reassoc)
649{
650 struct ieee80211_sub_if_data *sdata = wk->sdata;
651 struct ieee80211_local *local = sdata->local;
652 u16 capab_info, status_code, aid;
653 struct ieee802_11_elems elems;
654 u8 *pos;
655
b8d92c9c
JB		 656 if (wk->type != IEEE80211_WORK_ASSOC)
657 return WORK_ACT_MISMATCH;
658
af6b6374
JB		 659 /*
660 * AssocResp and ReassocResp have identical structure, so process both
661 * of them in this function.
662 */
663
664 if (len < 24 + 6)
665 return WORK_ACT_NONE;
666
667 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
668 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
669 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
670
671 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
672 "status=%d aid=%d)\n",
673 sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
674 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
675
676 pos = mgmt->u.assoc_resp.variable;
677 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
678
679 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
680 elems.timeout_int && elems.timeout_int_len == 5 &&
681 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
682 u32 tu, ms;
683 tu = get_unaligned_le32(elems.timeout_int + 1);
684 ms = tu * 1024 / 1000;
7d3a1c3b 685 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
af6b6374 686 "comeback duration %u TU (%u ms)\n",
7d3a1c3b 687 sdata->name, mgmt->sa, tu, ms);
af6b6374
JB		 688 wk->timeout = jiffies + msecs_to_jiffies(ms);
689 if (ms > IEEE80211_ASSOC_TIMEOUT)
690 run_again(local, wk->timeout);
691 return WORK_ACT_NONE;
692 }
693
694 if (status_code != WLAN_STATUS_SUCCESS)
7d3a1c3b
JB		 695 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
696 sdata->name, mgmt->sa, status_code);
af6b6374
JB		 697 else
698 printk(KERN_DEBUG "%s: associated\n", sdata->name);
699
700 return WORK_ACT_DONE;
701}
702
703static enum work_action __must_check
704ieee80211_rx_mgmt_probe_resp(struct ieee80211_work *wk,
705 struct ieee80211_mgmt *mgmt, size_t len,
706 struct ieee80211_rx_status *rx_status)
707{
708 struct ieee80211_sub_if_data *sdata = wk->sdata;
709 struct ieee80211_local *local = sdata->local;
710 size_t baselen;
711
712 ASSERT_WORK_MTX(local);
713
b8d92c9c
JB		 714 if (wk->type != IEEE80211_WORK_DIRECT_PROBE)
715 return WORK_ACT_MISMATCH;
716
717 if (len < 24 + 12)
718 return WORK_ACT_NONE;
719
af6b6374
JB		 720 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
721 if (baselen > len)
722 return WORK_ACT_NONE;
723
724 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
725 return WORK_ACT_DONE;
726}
727
e5b900d2
JB		 728static enum work_action __must_check
729ieee80211_rx_mgmt_beacon(struct ieee80211_work *wk,
730 struct ieee80211_mgmt *mgmt, size_t len)
731{
732 struct ieee80211_sub_if_data *sdata = wk->sdata;
733 struct ieee80211_local *local = sdata->local;
734
735 ASSERT_WORK_MTX(local);
736
737 if (wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
738 return WORK_ACT_MISMATCH;
739
740 if (len < 24 + 12)
741 return WORK_ACT_NONE;
742
743 printk(KERN_DEBUG "%s: beacon received\n", sdata->name);
744 return WORK_ACT_DONE;
745}
746
af6b6374
JB		 747static void ieee80211_work_rx_queued_mgmt(struct ieee80211_local *local,
748 struct sk_buff *skb)
749{
750 struct ieee80211_rx_status *rx_status;
751 struct ieee80211_mgmt *mgmt;
752 struct ieee80211_work *wk;
021570e5 753 enum work_action rma = WORK_ACT_NONE;
af6b6374
JB		 754 u16 fc;
755
756 rx_status = (struct ieee80211_rx_status *) skb->cb;
757 mgmt = (struct ieee80211_mgmt *) skb->data;
758 fc = le16_to_cpu(mgmt->frame_control);
759
760 mutex_lock(&local->work_mtx);
761
762 list_for_each_entry(wk, &local->work_list, list) {
763 const u8 *bssid = NULL;
764
765 switch (wk->type) {
766 case IEEE80211_WORK_DIRECT_PROBE:
767 case IEEE80211_WORK_AUTH:
768 case IEEE80211_WORK_ASSOC:
e5b900d2 769 case IEEE80211_WORK_ASSOC_BEACON_WAIT:
af6b6374
JB		 770 bssid = wk->filter_ta;
771 break;
772 default:
773 continue;
774 }
775
776 /*
777 * Before queuing, we already verified mgmt->sa,
778 * so this is needed just for matching.
779 */
780 if (compare_ether_addr(bssid, mgmt->bssid))
781 continue;
782
783 switch (fc & IEEE80211_FCTL_STYPE) {
e5b900d2
JB		 784 case IEEE80211_STYPE_BEACON:
785 rma = ieee80211_rx_mgmt_beacon(wk, mgmt, skb->len);
786 break;
af6b6374
JB		 787 case IEEE80211_STYPE_PROBE_RESP:
788 rma = ieee80211_rx_mgmt_probe_resp(wk, mgmt, skb->len,
789 rx_status);
790 break;
791 case IEEE80211_STYPE_AUTH:
792 rma = ieee80211_rx_mgmt_auth(wk, mgmt, skb->len);
793 break;
794 case IEEE80211_STYPE_ASSOC_RESP:
795 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
796 skb->len, false);
797 break;
798 case IEEE80211_STYPE_REASSOC_RESP:
799 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
800 skb->len, true);
801 break;
802 default:
803 WARN_ON(1);
b8d92c9c 804 rma = WORK_ACT_NONE;
af6b6374 805 }
b8d92c9c
JB		 806
807 /*
808 * We've either received an unexpected frame, or we have
809 * multiple work items and need to match the frame to the
810 * right one.
811 */
812 if (rma == WORK_ACT_MISMATCH)
813 continue;
814
af6b6374
JB		 815 /*
816 * We've processed this frame for that work, so it can't
817 * belong to another work struct.
818 * NB: this is also required for correctness for 'rma'!
819 */
820 break;
821 }
822
823 switch (rma) {
b8d92c9c
JB		 824 case WORK_ACT_MISMATCH:
825 /* ignore this unmatched frame */
826 break;
af6b6374
JB		 827 case WORK_ACT_NONE:
828 break;
829 case WORK_ACT_DONE:
830 list_del_rcu(&wk->list);
831 break;
832 default:
833 WARN(1, "unexpected: %d", rma);
834 }
835
836 mutex_unlock(&local->work_mtx);
837
838 if (rma != WORK_ACT_DONE)
839 goto out;
840
841 switch (wk->done(wk, skb)) {
842 case WORK_DONE_DESTROY:
843 free_work(wk);
844 break;
845 case WORK_DONE_REQUEUE:
846 synchronize_rcu();
e4da8c37 847 wk->started = false; /* restart */
af6b6374
JB		 848 mutex_lock(&local->work_mtx);
849 list_add_tail(&wk->list, &local->work_list);
850 mutex_unlock(&local->work_mtx);
851 }
852
853 out:
854 kfree_skb(skb);
855}
856
857static void ieee80211_work_timer(unsigned long data)
858{
859 struct ieee80211_local *local = (void *) data;
860
861 if (local->quiescing)
862 return;
863
864 ieee80211_queue_work(&local->hw, &local->work_work);
865}
866
867static void ieee80211_work_work(struct work_struct *work)
868{
869 struct ieee80211_local *local =
870 container_of(work, struct ieee80211_local, work_work);
871 struct sk_buff *skb;
872 struct ieee80211_work *wk, *tmp;
873 LIST_HEAD(free_work);
874 enum work_action rma;
e4da8c37 875 bool remain_off_channel = false;
af6b6374
JB		 876
877 if (local->scanning)
878 return;
879
880 /*
881 * ieee80211_queue_work() should have picked up most cases,
77c2061d 882 * here we'll pick the rest.
af6b6374
JB		 883 */
884 if (WARN(local->suspended, "work scheduled while going to suspend\n"))
885 return;
886
887 /* first process frames to avoid timing out while a frame is pending */
888 while ((skb = skb_dequeue(&local->work_skb_queue)))
889 ieee80211_work_rx_queued_mgmt(local, skb);
890
891 ieee80211_recalc_idle(local);
892
893 mutex_lock(&local->work_mtx);
894
895 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
723bae7e
JB		 896 bool started = wk->started;
897
e4da8c37 898 /* mark work as started if it's on the current off-channel */
723bae7e 899 if (!started && local->tmp_channel &&
e4da8c37
JB		 900 wk->chan == local->tmp_channel &&
901 wk->chan_type == local->tmp_channel_type) {
723bae7e 902 started = true;
81ac3462 903 wk->timeout = jiffies;
e4da8c37
JB		 904 }
905
723bae7e 906 if (!started && !local->tmp_channel) {
e4da8c37
JB		 907 /*
908 * TODO: could optimize this by leaving the
909 * station vifs in awake mode if they
910 * happen to be on the same channel as
911 * the requested channel
912 */
913 ieee80211_offchannel_stop_beaconing(local);
914 ieee80211_offchannel_stop_station(local);
915
916 local->tmp_channel = wk->chan;
917 local->tmp_channel_type = wk->chan_type;
918 ieee80211_hw_config(local, 0);
723bae7e 919 started = true;
e4da8c37
JB		 920 wk->timeout = jiffies;
921 }
922
923 /* don't try to work with items that aren't started */
723bae7e 924 if (!started)
e4da8c37
JB		 925 continue;
926
af6b6374
JB		 927 if (time_is_after_jiffies(wk->timeout)) {
928 /*
929 * This work item isn't supposed to be worked on
930 * right now, but take care to adjust the timer
931 * properly.
932 */
933 run_again(local, wk->timeout);
934 continue;
935 }
936
937 switch (wk->type) {
938 default:
939 WARN_ON(1);
940 /* nothing */
941 rma = WORK_ACT_NONE;
942 break;
b8bc4b0a
JB		 943 case IEEE80211_WORK_ABORT:
944 rma = WORK_ACT_TIMEOUT;
0e0a2283 945 break;
af6b6374
JB		 946 case IEEE80211_WORK_DIRECT_PROBE:
947 rma = ieee80211_direct_probe(wk);
948 break;
949 case IEEE80211_WORK_AUTH:
950 rma = ieee80211_authenticate(wk);
951 break;
952 case IEEE80211_WORK_ASSOC:
953 rma = ieee80211_associate(wk);
954 break;
b8bc4b0a
JB		 955 case IEEE80211_WORK_REMAIN_ON_CHANNEL:
956 rma = ieee80211_remain_on_channel_timeout(wk);
957 break;
e5b900d2
JB		 958 case IEEE80211_WORK_ASSOC_BEACON_WAIT:
959 rma = ieee80211_assoc_beacon_wait(wk);
960 break;
af6b6374
JB		 961 }
962
723bae7e
JB		 963 wk->started = started;
964
af6b6374
JB		 965 switch (rma) {
966 case WORK_ACT_NONE:
e4da8c37
JB		 967 /* might have changed the timeout */
968 run_again(local, wk->timeout);
af6b6374
JB		 969 break;
970 case WORK_ACT_TIMEOUT:
971 list_del_rcu(&wk->list);
972 synchronize_rcu();
973 list_add(&wk->list, &free_work);
974 break;
975 default:
976 WARN(1, "unexpected: %d", rma);
977 }
978 }
979
e4da8c37
JB		 980 list_for_each_entry(wk, &local->work_list, list) {
981 if (!wk->started)
982 continue;
983 if (wk->chan != local->tmp_channel)
984 continue;
985 if (wk->chan_type != local->tmp_channel_type)
986 continue;
987 remain_off_channel = true;
988 }
989
990 if (!remain_off_channel && local->tmp_channel) {
991 local->tmp_channel = NULL;
992 ieee80211_hw_config(local, 0);
993 ieee80211_offchannel_return(local, true);
994 /* give connection some time to breathe */
995 run_again(local, jiffies + HZ/2);
996 }
997
68dd5b7a
TP		 998 mutex_lock(&local->scan_mtx);
999
1000 if (list_empty(&local->work_list) && local->scan_req &&
1001 !local->scanning)
af6b6374
JB		 1002 ieee80211_queue_delayed_work(&local->hw,
1003 &local->scan_work,
1004 round_jiffies_relative(0));
1005
68dd5b7a
TP		 1006 mutex_unlock(&local->scan_mtx);
1007
af6b6374
JB		 1008 mutex_unlock(&local->work_mtx);
1009
e4da8c37
JB		 1010 ieee80211_recalc_idle(local);
1011
af6b6374
JB		 1012 list_for_each_entry_safe(wk, tmp, &free_work, list) {
1013 wk->done(wk, NULL);
1014 list_del(&wk->list);
1015 kfree(wk);
1016 }
1017}
1018
1019void ieee80211_add_work(struct ieee80211_work *wk)
1020{
1021 struct ieee80211_local *local;
1022
1023 if (WARN_ON(!wk->chan))
1024 return;
1025
1026 if (WARN_ON(!wk->sdata))
1027 return;
1028
1029 if (WARN_ON(!wk->done))
1030 return;
1031
81ac3462
JB		 1032 if (WARN_ON(!ieee80211_sdata_running(wk->sdata)))
1033 return;
1034
e4da8c37 1035 wk->started = false;
af6b6374
JB		 1036
1037 local = wk->sdata->local;
1038 mutex_lock(&local->work_mtx);
1039 list_add_tail(&wk->list, &local->work_list);
1040 mutex_unlock(&local->work_mtx);
1041
1042 ieee80211_queue_work(&local->hw, &local->work_work);
1043}
1044
1045void ieee80211_work_init(struct ieee80211_local *local)
1046{
1047 mutex_init(&local->work_mtx);
1048 INIT_LIST_HEAD(&local->work_list);
1049 setup_timer(&local->work_timer, ieee80211_work_timer,
1050 (unsigned long)local);
1051 INIT_WORK(&local->work_work, ieee80211_work_work);
1052 skb_queue_head_init(&local->work_skb_queue);
1053}
1054
1055void ieee80211_work_purge(struct ieee80211_sub_if_data *sdata)
1056{
1057 struct ieee80211_local *local = sdata->local;
b8bc4b0a 1058 struct ieee80211_work *wk;
af6b6374
JB		 1059
1060 mutex_lock(&local->work_mtx);
b8bc4b0a 1061 list_for_each_entry(wk, &local->work_list, list) {
af6b6374
JB		 1062 if (wk->sdata != sdata)
1063 continue;
b8bc4b0a 1064 wk->type = IEEE80211_WORK_ABORT;
e4da8c37
JB		 1065 wk->started = true;
1066 wk->timeout = jiffies;
b8bc4b0a
JB		 1067 }
1068 mutex_unlock(&local->work_mtx);
1069
1070 /* run cleanups etc. */
1071 ieee80211_work_work(&local->work_work);
1072
1073 mutex_lock(&local->work_mtx);
1074 list_for_each_entry(wk, &local->work_list, list) {
1075 if (wk->sdata != sdata)
1076 continue;
1077 WARN_ON(1);
1078 break;
af6b6374
JB		 1079 }
1080 mutex_unlock(&local->work_mtx);
1081}
1082
1083ieee80211_rx_result ieee80211_work_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1084 struct sk_buff *skb)
1085{
1086 struct ieee80211_local *local = sdata->local;
1087 struct ieee80211_mgmt *mgmt;
1088 struct ieee80211_work *wk;
1089 u16 fc;
1090
1091 if (skb->len < 24)
1092 return RX_DROP_MONITOR;
1093
1094 mgmt = (struct ieee80211_mgmt *) skb->data;
1095 fc = le16_to_cpu(mgmt->frame_control);
1096
1097 list_for_each_entry_rcu(wk, &local->work_list, list) {
1098 if (sdata != wk->sdata)
1099 continue;
1100 if (compare_ether_addr(wk->filter_ta, mgmt->sa))
1101 continue;
1102 if (compare_ether_addr(wk->filter_ta, mgmt->bssid))
1103 continue;
1104
1105 switch (fc & IEEE80211_FCTL_STYPE) {
1106 case IEEE80211_STYPE_AUTH:
1107 case IEEE80211_STYPE_PROBE_RESP:
1108 case IEEE80211_STYPE_ASSOC_RESP:
1109 case IEEE80211_STYPE_REASSOC_RESP:
e5b900d2 1110 case IEEE80211_STYPE_BEACON:
af6b6374
JB		 1111 skb_queue_tail(&local->work_skb_queue, skb);
1112 ieee80211_queue_work(&local->hw, &local->work_work);
1113 return RX_QUEUED;
1114 }
1115 }
1116
1117 return RX_CONTINUE;
1118}
b8bc4b0a 1119
e4da8c37
JB		 1120static enum work_done_result ieee80211_remain_done(struct ieee80211_work *wk,
1121 struct sk_buff *skb)
1122{
1123 /*
1124 * We are done serving the remain-on-channel command.
1125 */
1990ca61 1126 cfg80211_remain_on_channel_expired(wk->sdata->dev, (unsigned long) wk,
e4da8c37
JB		 1127 wk->chan, wk->chan_type,
1128 GFP_KERNEL);
1129
1130 return WORK_DONE_DESTROY;
1131}
1132
b8bc4b0a
JB		 1133int ieee80211_wk_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1134 struct ieee80211_channel *chan,
1135 enum nl80211_channel_type channel_type,
1136 unsigned int duration, u64 *cookie)
1137{
b8bc4b0a
JB		 1138 struct ieee80211_work *wk;
1139
1140 wk = kzalloc(sizeof(*wk), GFP_KERNEL);
1141 if (!wk)
1142 return -ENOMEM;
1143
1144 wk->type = IEEE80211_WORK_REMAIN_ON_CHANNEL;
1145 wk->chan = chan;
e4da8c37 1146 wk->chan_type = channel_type;
b8bc4b0a 1147 wk->sdata = sdata;
e4da8c37 1148 wk->done = ieee80211_remain_done;
b8bc4b0a 1149
e4da8c37 1150 wk->remain.duration = duration;
b8bc4b0a 1151
1990ca61 1152 *cookie = (unsigned long) wk;
b8bc4b0a
JB		 1153
1154 ieee80211_add_work(wk);
1155
b8bc4b0a
JB		 1156 return 0;
1157}
1158
1159int ieee80211_wk_cancel_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1160 u64 cookie)
1161{
1162 struct ieee80211_local *local = sdata->local;
1163 struct ieee80211_work *wk, *tmp;
1164 bool found = false;
1165
1166 mutex_lock(&local->work_mtx);
1167 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
1990ca61 1168 if ((unsigned long) wk == cookie) {
e4da8c37 1169 wk->timeout = jiffies;
b8bc4b0a 1170 found = true;
b8bc4b0a
JB		 1171 break;
1172 }
1173 }
1174 mutex_unlock(&local->work_mtx);
1175
1176 if (!found)
1177 return -ENOENT;
1178
e4da8c37 1179 ieee80211_queue_work(&local->hw, &local->work_work);
b8bc4b0a
JB		 1180
1181 return 0;
1182}
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