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mac80211: No need to include WEXT headers here
[mirror_ubuntu-artful-kernel.git] / net / mac80211 / work.c
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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
af6b6374
JB		 438 return WORK_ACT_TIMEOUT;
439 }
440
7d3a1c3b 441 printk(KERN_DEBUG "%s: direct probe to %pM (try %d)\n",
af6b6374
JB		 442 sdata->name, wk->filter_ta, wk->probe_auth.tries);
443
444 /*
445 * Direct probe is sent to broadcast address as some APs
446 * will not answer to direct packet in unassociated state.
447 */
448 ieee80211_send_probe_req(sdata, NULL, wk->probe_auth.ssid,
449 wk->probe_auth.ssid_len, NULL, 0);
450
451 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
452 run_again(local, wk->timeout);
453
454 return WORK_ACT_NONE;
455}
456
457
458static enum work_action __must_check
459ieee80211_authenticate(struct ieee80211_work *wk)
460{
461 struct ieee80211_sub_if_data *sdata = wk->sdata;
462 struct ieee80211_local *local = sdata->local;
463
464 wk->probe_auth.tries++;
465 if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
7d3a1c3b 466 printk(KERN_DEBUG "%s: authentication with %pM"
af6b6374
JB		 467 " timed out\n", sdata->name, wk->filter_ta);
468
469 /*
470 * Most likely AP is not in the range so remove the
471 * bss struct for that AP.
472 */
473 ieee80211_remove_auth_bss(local, wk);
474
af6b6374
JB		 475 return WORK_ACT_TIMEOUT;
476 }
477
7d3a1c3b 478 printk(KERN_DEBUG "%s: authenticate with %pM (try %d)\n",
af6b6374
JB		 479 sdata->name, wk->filter_ta, wk->probe_auth.tries);
480
481 ieee80211_send_auth(sdata, 1, wk->probe_auth.algorithm, wk->ie,
482 wk->ie_len, wk->filter_ta, NULL, 0, 0);
483 wk->probe_auth.transaction = 2;
484
485 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
486 run_again(local, wk->timeout);
487
488 return WORK_ACT_NONE;
489}
490
491static enum work_action __must_check
492ieee80211_associate(struct ieee80211_work *wk)
493{
494 struct ieee80211_sub_if_data *sdata = wk->sdata;
495 struct ieee80211_local *local = sdata->local;
496
497 wk->assoc.tries++;
498 if (wk->assoc.tries > IEEE80211_ASSOC_MAX_TRIES) {
7d3a1c3b 499 printk(KERN_DEBUG "%s: association with %pM"
af6b6374
JB		 500 " timed out\n",
501 sdata->name, wk->filter_ta);
502
503 /*
504 * Most likely AP is not in the range so remove the
505 * bss struct for that AP.
506 */
507 if (wk->assoc.bss)
0c1ad2ca 508 cfg80211_unlink_bss(local->hw.wiphy, wk->assoc.bss);
af6b6374 509
af6b6374
JB		 510 return WORK_ACT_TIMEOUT;
511 }
512
7d3a1c3b 513 printk(KERN_DEBUG "%s: associate with %pM (try %d)\n",
af6b6374
JB		 514 sdata->name, wk->filter_ta, wk->assoc.tries);
515 ieee80211_send_assoc(sdata, wk);
516
517 wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
518 run_again(local, wk->timeout);
519
520 return WORK_ACT_NONE;
521}
522
b8bc4b0a
JB		 523static enum work_action __must_check
524ieee80211_remain_on_channel_timeout(struct ieee80211_work *wk)
525{
b8bc4b0a
JB		 526 /*
527 * First time we run, do nothing -- the generic code will
528 * have switched to the right channel etc.
529 */
e4da8c37
JB		 530 if (!wk->remain.started) {
531 wk->remain.started = true;
532 wk->timeout = jiffies + msecs_to_jiffies(wk->remain.duration);
b8bc4b0a 533
e4da8c37
JB		 534 cfg80211_ready_on_channel(wk->sdata->dev, (u64)wk, wk->chan,
535 wk->chan_type, wk->remain.duration,
536 GFP_KERNEL);
b8bc4b0a 537
e4da8c37 538 return WORK_ACT_NONE;
b8bc4b0a
JB		 539 }
540
e4da8c37 541 return WORK_ACT_TIMEOUT;
b8bc4b0a
JB		 542}
543
af6b6374
JB		 544static void ieee80211_auth_challenge(struct ieee80211_work *wk,
545 struct ieee80211_mgmt *mgmt,
546 size_t len)
547{
548 struct ieee80211_sub_if_data *sdata = wk->sdata;
549 u8 *pos;
550 struct ieee802_11_elems elems;
551
552 pos = mgmt->u.auth.variable;
553 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
554 if (!elems.challenge)
555 return;
556 ieee80211_send_auth(sdata, 3, wk->probe_auth.algorithm,
557 elems.challenge - 2, elems.challenge_len + 2,
558 wk->filter_ta, wk->probe_auth.key,
559 wk->probe_auth.key_len, wk->probe_auth.key_idx);
560 wk->probe_auth.transaction = 4;
561}
562
563static enum work_action __must_check
564ieee80211_rx_mgmt_auth(struct ieee80211_work *wk,
565 struct ieee80211_mgmt *mgmt, size_t len)
566{
567 u16 auth_alg, auth_transaction, status_code;
568
569 if (wk->type != IEEE80211_WORK_AUTH)
570 return WORK_ACT_NONE;
571
572 if (len < 24 + 6)
573 return WORK_ACT_NONE;
574
575 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
576 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
577 status_code = le16_to_cpu(mgmt->u.auth.status_code);
578
579 if (auth_alg != wk->probe_auth.algorithm ||
580 auth_transaction != wk->probe_auth.transaction)
581 return WORK_ACT_NONE;
582
583 if (status_code != WLAN_STATUS_SUCCESS) {
584 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
585 wk->sdata->name, mgmt->sa, status_code);
586 return WORK_ACT_DONE;
587 }
588
589 switch (wk->probe_auth.algorithm) {
590 case WLAN_AUTH_OPEN:
591 case WLAN_AUTH_LEAP:
592 case WLAN_AUTH_FT:
593 break;
594 case WLAN_AUTH_SHARED_KEY:
595 if (wk->probe_auth.transaction != 4) {
596 ieee80211_auth_challenge(wk, mgmt, len);
597 /* need another frame */
598 return WORK_ACT_NONE;
599 }
600 break;
601 default:
602 WARN_ON(1);
603 return WORK_ACT_NONE;
604 }
605
606 printk(KERN_DEBUG "%s: authenticated\n", wk->sdata->name);
607 return WORK_ACT_DONE;
608}
609
610static enum work_action __must_check
611ieee80211_rx_mgmt_assoc_resp(struct ieee80211_work *wk,
612 struct ieee80211_mgmt *mgmt, size_t len,
613 bool reassoc)
614{
615 struct ieee80211_sub_if_data *sdata = wk->sdata;
616 struct ieee80211_local *local = sdata->local;
617 u16 capab_info, status_code, aid;
618 struct ieee802_11_elems elems;
619 u8 *pos;
620
621 /*
622 * AssocResp and ReassocResp have identical structure, so process both
623 * of them in this function.
624 */
625
626 if (len < 24 + 6)
627 return WORK_ACT_NONE;
628
629 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
630 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
631 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
632
633 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
634 "status=%d aid=%d)\n",
635 sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
636 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
637
638 pos = mgmt->u.assoc_resp.variable;
639 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
640
641 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
642 elems.timeout_int && elems.timeout_int_len == 5 &&
643 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
644 u32 tu, ms;
645 tu = get_unaligned_le32(elems.timeout_int + 1);
646 ms = tu * 1024 / 1000;
7d3a1c3b 647 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
af6b6374 648 "comeback duration %u TU (%u ms)\n",
7d3a1c3b 649 sdata->name, mgmt->sa, tu, ms);
af6b6374
JB		 650 wk->timeout = jiffies + msecs_to_jiffies(ms);
651 if (ms > IEEE80211_ASSOC_TIMEOUT)
652 run_again(local, wk->timeout);
653 return WORK_ACT_NONE;
654 }
655
656 if (status_code != WLAN_STATUS_SUCCESS)
7d3a1c3b
JB		 657 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
658 sdata->name, mgmt->sa, status_code);
af6b6374
JB		 659 else
660 printk(KERN_DEBUG "%s: associated\n", sdata->name);
661
662 return WORK_ACT_DONE;
663}
664
665static enum work_action __must_check
666ieee80211_rx_mgmt_probe_resp(struct ieee80211_work *wk,
667 struct ieee80211_mgmt *mgmt, size_t len,
668 struct ieee80211_rx_status *rx_status)
669{
670 struct ieee80211_sub_if_data *sdata = wk->sdata;
671 struct ieee80211_local *local = sdata->local;
672 size_t baselen;
673
674 ASSERT_WORK_MTX(local);
675
676 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
677 if (baselen > len)
678 return WORK_ACT_NONE;
679
680 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
681 return WORK_ACT_DONE;
682}
683
684static void ieee80211_work_rx_queued_mgmt(struct ieee80211_local *local,
685 struct sk_buff *skb)
686{
687 struct ieee80211_rx_status *rx_status;
688 struct ieee80211_mgmt *mgmt;
689 struct ieee80211_work *wk;
690 enum work_action rma = WORK_ACT_NONE;
691 u16 fc;
692
693 rx_status = (struct ieee80211_rx_status *) skb->cb;
694 mgmt = (struct ieee80211_mgmt *) skb->data;
695 fc = le16_to_cpu(mgmt->frame_control);
696
697 mutex_lock(&local->work_mtx);
698
699 list_for_each_entry(wk, &local->work_list, list) {
700 const u8 *bssid = NULL;
701
702 switch (wk->type) {
703 case IEEE80211_WORK_DIRECT_PROBE:
704 case IEEE80211_WORK_AUTH:
705 case IEEE80211_WORK_ASSOC:
706 bssid = wk->filter_ta;
707 break;
708 default:
709 continue;
710 }
711
712 /*
713 * Before queuing, we already verified mgmt->sa,
714 * so this is needed just for matching.
715 */
716 if (compare_ether_addr(bssid, mgmt->bssid))
717 continue;
718
719 switch (fc & IEEE80211_FCTL_STYPE) {
720 case IEEE80211_STYPE_PROBE_RESP:
721 rma = ieee80211_rx_mgmt_probe_resp(wk, mgmt, skb->len,
722 rx_status);
723 break;
724 case IEEE80211_STYPE_AUTH:
725 rma = ieee80211_rx_mgmt_auth(wk, mgmt, skb->len);
726 break;
727 case IEEE80211_STYPE_ASSOC_RESP:
728 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
729 skb->len, false);
730 break;
731 case IEEE80211_STYPE_REASSOC_RESP:
732 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
733 skb->len, true);
734 break;
735 default:
736 WARN_ON(1);
737 }
738 /*
739 * We've processed this frame for that work, so it can't
740 * belong to another work struct.
741 * NB: this is also required for correctness for 'rma'!
742 */
743 break;
744 }
745
746 switch (rma) {
747 case WORK_ACT_NONE:
748 break;
749 case WORK_ACT_DONE:
750 list_del_rcu(&wk->list);
751 break;
752 default:
753 WARN(1, "unexpected: %d", rma);
754 }
755
756 mutex_unlock(&local->work_mtx);
757
758 if (rma != WORK_ACT_DONE)
759 goto out;
760
761 switch (wk->done(wk, skb)) {
762 case WORK_DONE_DESTROY:
763 free_work(wk);
764 break;
765 case WORK_DONE_REQUEUE:
766 synchronize_rcu();
e4da8c37 767 wk->started = false; /* restart */
af6b6374
JB		 768 mutex_lock(&local->work_mtx);
769 list_add_tail(&wk->list, &local->work_list);
770 mutex_unlock(&local->work_mtx);
771 }
772
773 out:
774 kfree_skb(skb);
775}
776
777static void ieee80211_work_timer(unsigned long data)
778{
779 struct ieee80211_local *local = (void *) data;
780
781 if (local->quiescing)
782 return;
783
784 ieee80211_queue_work(&local->hw, &local->work_work);
785}
786
787static void ieee80211_work_work(struct work_struct *work)
788{
789 struct ieee80211_local *local =
790 container_of(work, struct ieee80211_local, work_work);
791 struct sk_buff *skb;
792 struct ieee80211_work *wk, *tmp;
793 LIST_HEAD(free_work);
794 enum work_action rma;
e4da8c37 795 bool remain_off_channel = false;
af6b6374
JB		 796
797 if (local->scanning)
798 return;
799
800 /*
801 * ieee80211_queue_work() should have picked up most cases,
802 * here we'll pick the the rest.
803 */
804 if (WARN(local->suspended, "work scheduled while going to suspend\n"))
805 return;
806
807 /* first process frames to avoid timing out while a frame is pending */
808 while ((skb = skb_dequeue(&local->work_skb_queue)))
809 ieee80211_work_rx_queued_mgmt(local, skb);
810
811 ieee80211_recalc_idle(local);
812
813 mutex_lock(&local->work_mtx);
814
815 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
e4da8c37
JB		 816 /* mark work as started if it's on the current off-channel */
817 if (!wk->started && local->tmp_channel &&
818 wk->chan == local->tmp_channel &&
819 wk->chan_type == local->tmp_channel_type) {
820 wk->started = true;
821 }
822
823 if (!wk->started && !local->tmp_channel) {
824 /*
825 * TODO: could optimize this by leaving the
826 * station vifs in awake mode if they
827 * happen to be on the same channel as
828 * the requested channel
829 */
830 ieee80211_offchannel_stop_beaconing(local);
831 ieee80211_offchannel_stop_station(local);
832
833 local->tmp_channel = wk->chan;
834 local->tmp_channel_type = wk->chan_type;
835 ieee80211_hw_config(local, 0);
836 wk->started = true;
837 wk->timeout = jiffies;
838 }
839
840 /* don't try to work with items that aren't started */
841 if (!wk->started)
842 continue;
843
af6b6374
JB		 844 if (time_is_after_jiffies(wk->timeout)) {
845 /*
846 * This work item isn't supposed to be worked on
847 * right now, but take care to adjust the timer
848 * properly.
849 */
850 run_again(local, wk->timeout);
851 continue;
852 }
853
854 switch (wk->type) {
855 default:
856 WARN_ON(1);
857 /* nothing */
858 rma = WORK_ACT_NONE;
859 break;
b8bc4b0a
JB		 860 case IEEE80211_WORK_ABORT:
861 rma = WORK_ACT_TIMEOUT;
af6b6374
JB		 862 case IEEE80211_WORK_DIRECT_PROBE:
863 rma = ieee80211_direct_probe(wk);
864 break;
865 case IEEE80211_WORK_AUTH:
866 rma = ieee80211_authenticate(wk);
867 break;
868 case IEEE80211_WORK_ASSOC:
869 rma = ieee80211_associate(wk);
870 break;
b8bc4b0a
JB		 871 case IEEE80211_WORK_REMAIN_ON_CHANNEL:
872 rma = ieee80211_remain_on_channel_timeout(wk);
873 break;
af6b6374
JB		 874 }
875
876 switch (rma) {
877 case WORK_ACT_NONE:
e4da8c37
JB		 878 /* might have changed the timeout */
879 run_again(local, wk->timeout);
af6b6374
JB		 880 break;
881 case WORK_ACT_TIMEOUT:
882 list_del_rcu(&wk->list);
883 synchronize_rcu();
884 list_add(&wk->list, &free_work);
885 break;
886 default:
887 WARN(1, "unexpected: %d", rma);
888 }
889 }
890
e4da8c37
JB		 891 list_for_each_entry(wk, &local->work_list, list) {
892 if (!wk->started)
893 continue;
894 if (wk->chan != local->tmp_channel)
895 continue;
896 if (wk->chan_type != local->tmp_channel_type)
897 continue;
898 remain_off_channel = true;
899 }
900
901 if (!remain_off_channel && local->tmp_channel) {
902 local->tmp_channel = NULL;
903 ieee80211_hw_config(local, 0);
904 ieee80211_offchannel_return(local, true);
905 /* give connection some time to breathe */
906 run_again(local, jiffies + HZ/2);
907 }
908
af6b6374
JB		 909 if (list_empty(&local->work_list) && local->scan_req)
910 ieee80211_queue_delayed_work(&local->hw,
911 &local->scan_work,
912 round_jiffies_relative(0));
913
914 mutex_unlock(&local->work_mtx);
915
e4da8c37
JB		 916 ieee80211_recalc_idle(local);
917
af6b6374
JB		 918 list_for_each_entry_safe(wk, tmp, &free_work, list) {
919 wk->done(wk, NULL);
920 list_del(&wk->list);
921 kfree(wk);
922 }
923}
924
925void ieee80211_add_work(struct ieee80211_work *wk)
926{
927 struct ieee80211_local *local;
928
929 if (WARN_ON(!wk->chan))
930 return;
931
932 if (WARN_ON(!wk->sdata))
933 return;
934
935 if (WARN_ON(!wk->done))
936 return;
937
e4da8c37 938 wk->started = false;
af6b6374
JB		 939
940 local = wk->sdata->local;
941 mutex_lock(&local->work_mtx);
942 list_add_tail(&wk->list, &local->work_list);
943 mutex_unlock(&local->work_mtx);
944
945 ieee80211_queue_work(&local->hw, &local->work_work);
946}
947
948void ieee80211_work_init(struct ieee80211_local *local)
949{
950 mutex_init(&local->work_mtx);
951 INIT_LIST_HEAD(&local->work_list);
952 setup_timer(&local->work_timer, ieee80211_work_timer,
953 (unsigned long)local);
954 INIT_WORK(&local->work_work, ieee80211_work_work);
955 skb_queue_head_init(&local->work_skb_queue);
956}
957
958void ieee80211_work_purge(struct ieee80211_sub_if_data *sdata)
959{
960 struct ieee80211_local *local = sdata->local;
b8bc4b0a 961 struct ieee80211_work *wk;
af6b6374
JB		 962
963 mutex_lock(&local->work_mtx);
b8bc4b0a 964 list_for_each_entry(wk, &local->work_list, list) {
af6b6374
JB		 965 if (wk->sdata != sdata)
966 continue;
b8bc4b0a 967 wk->type = IEEE80211_WORK_ABORT;
e4da8c37
JB		 968 wk->started = true;
969 wk->timeout = jiffies;
b8bc4b0a
JB		 970 }
971 mutex_unlock(&local->work_mtx);
972
973 /* run cleanups etc. */
974 ieee80211_work_work(&local->work_work);
975
976 mutex_lock(&local->work_mtx);
977 list_for_each_entry(wk, &local->work_list, list) {
978 if (wk->sdata != sdata)
979 continue;
980 WARN_ON(1);
981 break;
af6b6374
JB		 982 }
983 mutex_unlock(&local->work_mtx);
984}
985
986ieee80211_rx_result ieee80211_work_rx_mgmt(struct ieee80211_sub_if_data *sdata,
987 struct sk_buff *skb)
988{
989 struct ieee80211_local *local = sdata->local;
990 struct ieee80211_mgmt *mgmt;
991 struct ieee80211_work *wk;
992 u16 fc;
993
994 if (skb->len < 24)
995 return RX_DROP_MONITOR;
996
997 mgmt = (struct ieee80211_mgmt *) skb->data;
998 fc = le16_to_cpu(mgmt->frame_control);
999
1000 list_for_each_entry_rcu(wk, &local->work_list, list) {
1001 if (sdata != wk->sdata)
1002 continue;
1003 if (compare_ether_addr(wk->filter_ta, mgmt->sa))
1004 continue;
1005 if (compare_ether_addr(wk->filter_ta, mgmt->bssid))
1006 continue;
1007
1008 switch (fc & IEEE80211_FCTL_STYPE) {
1009 case IEEE80211_STYPE_AUTH:
1010 case IEEE80211_STYPE_PROBE_RESP:
1011 case IEEE80211_STYPE_ASSOC_RESP:
1012 case IEEE80211_STYPE_REASSOC_RESP:
1013 case IEEE80211_STYPE_DEAUTH:
1014 case IEEE80211_STYPE_DISASSOC:
1015 skb_queue_tail(&local->work_skb_queue, skb);
1016 ieee80211_queue_work(&local->hw, &local->work_work);
1017 return RX_QUEUED;
1018 }
1019 }
1020
1021 return RX_CONTINUE;
1022}
b8bc4b0a 1023
e4da8c37
JB		 1024static enum work_done_result ieee80211_remain_done(struct ieee80211_work *wk,
1025 struct sk_buff *skb)
1026{
1027 /*
1028 * We are done serving the remain-on-channel command.
1029 */
1030 cfg80211_remain_on_channel_expired(wk->sdata->dev, (u64)wk,
1031 wk->chan, wk->chan_type,
1032 GFP_KERNEL);
1033
1034 return WORK_DONE_DESTROY;
1035}
1036
b8bc4b0a
JB		 1037int ieee80211_wk_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1038 struct ieee80211_channel *chan,
1039 enum nl80211_channel_type channel_type,
1040 unsigned int duration, u64 *cookie)
1041{
b8bc4b0a
JB		 1042 struct ieee80211_work *wk;
1043
1044 wk = kzalloc(sizeof(*wk), GFP_KERNEL);
1045 if (!wk)
1046 return -ENOMEM;
1047
1048 wk->type = IEEE80211_WORK_REMAIN_ON_CHANNEL;
1049 wk->chan = chan;
e4da8c37 1050 wk->chan_type = channel_type;
b8bc4b0a 1051 wk->sdata = sdata;
e4da8c37 1052 wk->done = ieee80211_remain_done;
b8bc4b0a 1053
e4da8c37 1054 wk->remain.duration = duration;
b8bc4b0a
JB		 1055
1056 *cookie = (u64)wk;
1057
1058 ieee80211_add_work(wk);
1059
b8bc4b0a
JB		 1060 return 0;
1061}
1062
1063int ieee80211_wk_cancel_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1064 u64 cookie)
1065{
1066 struct ieee80211_local *local = sdata->local;
1067 struct ieee80211_work *wk, *tmp;
1068 bool found = false;
1069
1070 mutex_lock(&local->work_mtx);
1071 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
1072 if ((u64)wk == cookie) {
e4da8c37 1073 wk->timeout = jiffies;
b8bc4b0a 1074 found = true;
b8bc4b0a
JB		 1075 break;
1076 }
1077 }
1078 mutex_unlock(&local->work_mtx);
1079
1080 if (!found)
1081 return -ENOENT;
1082
e4da8c37 1083 ieee80211_queue_work(&local->hw, &local->work_work);
b8bc4b0a
JB		 1084
1085 return 0;
1086}
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