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MIPS: Yosemite, Emma: Fix off-by-two in arcs_cmdline buffer size check
[linux-2.6/linux-mips.git] / net / mac80211 / work.c
blob94472eb34d76452acfddfb624eba7e44f46e3445
1 /*
2 * mac80211 work implementation
3 *
4 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
5 * Copyright 2004, Instant802 Networks, Inc.
6 * Copyright 2005, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
9 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16 #include <linux/delay.h>
17 #include <linux/if_ether.h>
18 #include <linux/skbuff.h>
19 #include <linux/if_arp.h>
20 #include <linux/etherdevice.h>
21 #include <linux/crc32.h>
22 #include <linux/slab.h>
23 #include <net/mac80211.h>
24 #include <asm/unaligned.h>
25
26 #include "ieee80211_i.h"
27 #include "rate.h"
28 #include "driver-ops.h"
29
30 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
31 #define IEEE80211_AUTH_MAX_TRIES 3
32 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
33 #define IEEE80211_ASSOC_MAX_TRIES 3
34
35 enum work_action {
36 WORK_ACT_MISMATCH,
37 WORK_ACT_NONE,
38 WORK_ACT_TIMEOUT,
39 WORK_ACT_DONE,
40 };
41
42
43 /* utils */
44 static inline void ASSERT_WORK_MTX(struct ieee80211_local *local)
45 {
46 lockdep_assert_held(&local->mtx);
47 }
48
49 /*
50 * We can have multiple work items (and connection probing)
51 * scheduling this timer, but we need to take care to only
52 * reschedule it when it should fire _earlier_ than it was
53 * asked for before, or if it's not pending right now. This
54 * function ensures that. Note that it then is required to
55 * run this function for all timeouts after the first one
56 * has happened -- the work that runs from this timer will
57 * do that.
58 */
59 static void run_again(struct ieee80211_local *local,
60 unsigned long timeout)
61 {
62 ASSERT_WORK_MTX(local);
63
64 if (!timer_pending(&local->work_timer) ||
65 time_before(timeout, local->work_timer.expires))
66 mod_timer(&local->work_timer, timeout);
67 }
68
69 void free_work(struct ieee80211_work *wk)
70 {
71 kfree_rcu(wk, rcu_head);
72 }
73
74 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
75 struct ieee80211_supported_band *sband,
76 u32 *rates)
77 {
78 int i, j, count;
79 *rates = 0;
80 count = 0;
81 for (i = 0; i < supp_rates_len; i++) {
82 int rate = (supp_rates[i] & 0x7F) * 5;
83
84 for (j = 0; j < sband->n_bitrates; j++)
85 if (sband->bitrates[j].bitrate == rate) {
86 *rates |= BIT(j);
87 count++;
88 break;
89 }
90 }
91
92 return count;
93 }
94
95 /* frame sending functions */
96
97 static void ieee80211_add_ht_ie(struct sk_buff *skb, const u8 *ht_info_ie,
98 struct ieee80211_supported_band *sband,
99 struct ieee80211_channel *channel,
100 enum ieee80211_smps_mode smps)
101 {
102 struct ieee80211_ht_info *ht_info;
103 u8 *pos;
104 u32 flags = channel->flags;
105 u16 cap = sband->ht_cap.cap;
106 __le16 tmp;
107
108 if (!sband->ht_cap.ht_supported)
109 return;
110
111 if (!ht_info_ie)
112 return;
113
114 if (ht_info_ie[1] < sizeof(struct ieee80211_ht_info))
115 return;
116
117 ht_info = (struct ieee80211_ht_info *)(ht_info_ie + 2);
118
119 /* determine capability flags */
120
121 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
122 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
123 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
124 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
125 cap &= ~IEEE80211_HT_CAP_SGI_40;
126 }
127 break;
128 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
129 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
130 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
131 cap &= ~IEEE80211_HT_CAP_SGI_40;
132 }
133 break;
134 }
135
136 /* set SM PS mode properly */
137 cap &= ~IEEE80211_HT_CAP_SM_PS;
138 switch (smps) {
139 case IEEE80211_SMPS_AUTOMATIC:
140 case IEEE80211_SMPS_NUM_MODES:
141 WARN_ON(1);
142 case IEEE80211_SMPS_OFF:
143 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
144 IEEE80211_HT_CAP_SM_PS_SHIFT;
145 break;
146 case IEEE80211_SMPS_STATIC:
147 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
148 IEEE80211_HT_CAP_SM_PS_SHIFT;
149 break;
150 case IEEE80211_SMPS_DYNAMIC:
151 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
152 IEEE80211_HT_CAP_SM_PS_SHIFT;
153 break;
154 }
155
156 /* reserve and fill IE */
157
158 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
159 *pos++ = WLAN_EID_HT_CAPABILITY;
160 *pos++ = sizeof(struct ieee80211_ht_cap);
161 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
162
163 /* capability flags */
164 tmp = cpu_to_le16(cap);
165 memcpy(pos, &tmp, sizeof(u16));
166 pos += sizeof(u16);
167
168 /* AMPDU parameters */
169 *pos++ = sband->ht_cap.ampdu_factor |
170 (sband->ht_cap.ampdu_density <<
171 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
172
173 /* MCS set */
174 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
175 pos += sizeof(sband->ht_cap.mcs);
176
177 /* extended capabilities */
178 pos += sizeof(__le16);
179
180 /* BF capabilities */
181 pos += sizeof(__le32);
182
183 /* antenna selection */
184 pos += sizeof(u8);
185 }
186
187 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
188 struct ieee80211_work *wk)
189 {
190 struct ieee80211_local *local = sdata->local;
191 struct sk_buff *skb;
192 struct ieee80211_mgmt *mgmt;
193 u8 *pos, qos_info;
194 size_t offset = 0, noffset;
195 int i, count, rates_len, supp_rates_len;
196 u16 capab;
197 struct ieee80211_supported_band *sband;
198 u32 rates = 0;
199
200 sband = local->hw.wiphy->bands[wk->chan->band];
201
202 if (wk->assoc.supp_rates_len) {
203 /*
204 * Get all rates supported by the device and the AP as
205 * some APs don't like getting a superset of their rates
206 * in the association request (e.g. D-Link DAP 1353 in
207 * b-only mode)...
208 */
209 rates_len = ieee80211_compatible_rates(wk->assoc.supp_rates,
210 wk->assoc.supp_rates_len,
211 sband, &rates);
212 } else {
213 /*
214 * In case AP not provide any supported rates information
215 * before association, we send information element(s) with
216 * all rates that we support.
217 */
218 rates = ~0;
219 rates_len = sband->n_bitrates;
220 }
221
222 skb = alloc_skb(local->hw.extra_tx_headroom +
223 sizeof(*mgmt) + /* bit too much but doesn't matter */
224 2 + wk->assoc.ssid_len + /* SSID */
225 4 + rates_len + /* (extended) rates */
226 4 + /* power capability */
227 2 + 2 * sband->n_channels + /* supported channels */
228 2 + sizeof(struct ieee80211_ht_cap) + /* HT */
229 wk->ie_len + /* extra IEs */
230 9, /* WMM */
231 GFP_KERNEL);
232 if (!skb)
233 return;
234
235 skb_reserve(skb, local->hw.extra_tx_headroom);
236
237 capab = WLAN_CAPABILITY_ESS;
238
239 if (sband->band == IEEE80211_BAND_2GHZ) {
240 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
241 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
242 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
243 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
244 }
245
246 if (wk->assoc.capability & WLAN_CAPABILITY_PRIVACY)
247 capab |= WLAN_CAPABILITY_PRIVACY;
248
249 if ((wk->assoc.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
250 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
251 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
252
253 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
254 memset(mgmt, 0, 24);
255 memcpy(mgmt->da, wk->filter_ta, ETH_ALEN);
256 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
257 memcpy(mgmt->bssid, wk->filter_ta, ETH_ALEN);
258
259 if (!is_zero_ether_addr(wk->assoc.prev_bssid)) {
260 skb_put(skb, 10);
261 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
262 IEEE80211_STYPE_REASSOC_REQ);
263 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
264 mgmt->u.reassoc_req.listen_interval =
265 cpu_to_le16(local->hw.conf.listen_interval);
266 memcpy(mgmt->u.reassoc_req.current_ap, wk->assoc.prev_bssid,
267 ETH_ALEN);
268 } else {
269 skb_put(skb, 4);
270 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
271 IEEE80211_STYPE_ASSOC_REQ);
272 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
273 mgmt->u.assoc_req.listen_interval =
274 cpu_to_le16(local->hw.conf.listen_interval);
275 }
276
277 /* SSID */
278 pos = skb_put(skb, 2 + wk->assoc.ssid_len);
279 *pos++ = WLAN_EID_SSID;
280 *pos++ = wk->assoc.ssid_len;
281 memcpy(pos, wk->assoc.ssid, wk->assoc.ssid_len);
282
283 /* add all rates which were marked to be used above */
284 supp_rates_len = rates_len;
285 if (supp_rates_len > 8)
286 supp_rates_len = 8;
287
288 pos = skb_put(skb, supp_rates_len + 2);
289 *pos++ = WLAN_EID_SUPP_RATES;
290 *pos++ = supp_rates_len;
291
292 count = 0;
293 for (i = 0; i < sband->n_bitrates; i++) {
294 if (BIT(i) & rates) {
295 int rate = sband->bitrates[i].bitrate;
296 *pos++ = (u8) (rate / 5);
297 if (++count == 8)
298 break;
299 }
300 }
301
302 if (rates_len > count) {
303 pos = skb_put(skb, rates_len - count + 2);
304 *pos++ = WLAN_EID_EXT_SUPP_RATES;
305 *pos++ = rates_len - count;
306
307 for (i++; i < sband->n_bitrates; i++) {
308 if (BIT(i) & rates) {
309 int rate = sband->bitrates[i].bitrate;
310 *pos++ = (u8) (rate / 5);
311 }
312 }
313 }
314
315 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
316 /* 1. power capabilities */
317 pos = skb_put(skb, 4);
318 *pos++ = WLAN_EID_PWR_CAPABILITY;
319 *pos++ = 2;
320 *pos++ = 0; /* min tx power */
321 *pos++ = wk->chan->max_power; /* max tx power */
322
323 /* 2. supported channels */
324 /* TODO: get this in reg domain format */
325 pos = skb_put(skb, 2 * sband->n_channels + 2);
326 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
327 *pos++ = 2 * sband->n_channels;
328 for (i = 0; i < sband->n_channels; i++) {
329 *pos++ = ieee80211_frequency_to_channel(
330 sband->channels[i].center_freq);
331 *pos++ = 1; /* one channel in the subband*/
332 }
333 }
334
335 /* if present, add any custom IEs that go before HT */
336 if (wk->ie_len && wk->ie) {
337 static const u8 before_ht[] = {
338 WLAN_EID_SSID,
339 WLAN_EID_SUPP_RATES,
340 WLAN_EID_EXT_SUPP_RATES,
341 WLAN_EID_PWR_CAPABILITY,
342 WLAN_EID_SUPPORTED_CHANNELS,
343 WLAN_EID_RSN,
344 WLAN_EID_QOS_CAPA,
345 WLAN_EID_RRM_ENABLED_CAPABILITIES,
346 WLAN_EID_MOBILITY_DOMAIN,
347 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
348 };
349 noffset = ieee80211_ie_split(wk->ie, wk->ie_len,
350 before_ht, ARRAY_SIZE(before_ht),
351 offset);
352 pos = skb_put(skb, noffset - offset);
353 memcpy(pos, wk->ie + offset, noffset - offset);
354 offset = noffset;
355 }
356
357 if (wk->assoc.use_11n && wk->assoc.wmm_used &&
358 local->hw.queues >= 4)
359 ieee80211_add_ht_ie(skb, wk->assoc.ht_information_ie,
360 sband, wk->chan, wk->assoc.smps);
361
362 /* if present, add any custom non-vendor IEs that go after HT */
363 if (wk->ie_len && wk->ie) {
364 noffset = ieee80211_ie_split_vendor(wk->ie, wk->ie_len,
365 offset);
366 pos = skb_put(skb, noffset - offset);
367 memcpy(pos, wk->ie + offset, noffset - offset);
368 offset = noffset;
369 }
370
371 if (wk->assoc.wmm_used && local->hw.queues >= 4) {
372 if (wk->assoc.uapsd_used) {
373 qos_info = local->uapsd_queues;
374 qos_info |= (local->uapsd_max_sp_len <<
375 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
376 } else {
377 qos_info = 0;
378 }
379
380 pos = skb_put(skb, 9);
381 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
382 *pos++ = 7; /* len */
383 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
384 *pos++ = 0x50;
385 *pos++ = 0xf2;
386 *pos++ = 2; /* WME */
387 *pos++ = 0; /* WME info */
388 *pos++ = 1; /* WME ver */
389 *pos++ = qos_info;
390 }
391
392 /* add any remaining custom (i.e. vendor specific here) IEs */
393 if (wk->ie_len && wk->ie) {
394 noffset = wk->ie_len;
395 pos = skb_put(skb, noffset - offset);
396 memcpy(pos, wk->ie + offset, noffset - offset);
397 }
398
399 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
400 ieee80211_tx_skb(sdata, skb);
401 }
402
403 static void ieee80211_remove_auth_bss(struct ieee80211_local *local,
404 struct ieee80211_work *wk)
405 {
406 struct cfg80211_bss *cbss;
407 u16 capa_val = WLAN_CAPABILITY_ESS;
408
409 if (wk->probe_auth.privacy)
410 capa_val |= WLAN_CAPABILITY_PRIVACY;
411
412 cbss = cfg80211_get_bss(local->hw.wiphy, wk->chan, wk->filter_ta,
413 wk->probe_auth.ssid, wk->probe_auth.ssid_len,
414 WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
415 capa_val);
416 if (!cbss)
417 return;
418
419 cfg80211_unlink_bss(local->hw.wiphy, cbss);
420 cfg80211_put_bss(cbss);
421 }
422
423 static enum work_action __must_check
424 ieee80211_direct_probe(struct ieee80211_work *wk)
425 {
426 struct ieee80211_sub_if_data *sdata = wk->sdata;
427 struct ieee80211_local *local = sdata->local;
428
429 if (!wk->probe_auth.synced) {
430 int ret = drv_tx_sync(local, sdata, wk->filter_ta,
431 IEEE80211_TX_SYNC_AUTH);
432 if (ret)
433 return WORK_ACT_TIMEOUT;
434 }
435 wk->probe_auth.synced = true;
436
437 wk->probe_auth.tries++;
438 if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
439 printk(KERN_DEBUG "%s: direct probe to %pM timed out\n",
440 sdata->name, wk->filter_ta);
441
442 /*
443 * Most likely AP is not in the range so remove the
444 * bss struct for that AP.
445 */
446 ieee80211_remove_auth_bss(local, wk);
447
448 return WORK_ACT_TIMEOUT;
449 }
450
451 printk(KERN_DEBUG "%s: direct probe to %pM (try %d/%i)\n",
452 sdata->name, wk->filter_ta, wk->probe_auth.tries,
453 IEEE80211_AUTH_MAX_TRIES);
454
455 /*
456 * Direct probe is sent to broadcast address as some APs
457 * will not answer to direct packet in unassociated state.
458 */
459 ieee80211_send_probe_req(sdata, NULL, wk->probe_auth.ssid,
460 wk->probe_auth.ssid_len, NULL, 0,
461 (u32) -1, true, false);
462
463 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
464 run_again(local, wk->timeout);
465
466 return WORK_ACT_NONE;
467 }
468
469
470 static enum work_action __must_check
471 ieee80211_authenticate(struct ieee80211_work *wk)
472 {
473 struct ieee80211_sub_if_data *sdata = wk->sdata;
474 struct ieee80211_local *local = sdata->local;
475
476 if (!wk->probe_auth.synced) {
477 int ret = drv_tx_sync(local, sdata, wk->filter_ta,
478 IEEE80211_TX_SYNC_AUTH);
479 if (ret)
480 return WORK_ACT_TIMEOUT;
481 }
482 wk->probe_auth.synced = true;
483
484 wk->probe_auth.tries++;
485 if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
486 printk(KERN_DEBUG "%s: authentication with %pM"
487 " timed out\n", sdata->name, wk->filter_ta);
488
489 /*
490 * Most likely AP is not in the range so remove the
491 * bss struct for that AP.
492 */
493 ieee80211_remove_auth_bss(local, wk);
494
495 return WORK_ACT_TIMEOUT;
496 }
497
498 printk(KERN_DEBUG "%s: authenticate with %pM (try %d)\n",
499 sdata->name, wk->filter_ta, wk->probe_auth.tries);
500
501 ieee80211_send_auth(sdata, 1, wk->probe_auth.algorithm, wk->ie,
502 wk->ie_len, wk->filter_ta, NULL, 0, 0);
503 wk->probe_auth.transaction = 2;
504
505 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
506 run_again(local, wk->timeout);
507
508 return WORK_ACT_NONE;
509 }
510
511 static enum work_action __must_check
512 ieee80211_associate(struct ieee80211_work *wk)
513 {
514 struct ieee80211_sub_if_data *sdata = wk->sdata;
515 struct ieee80211_local *local = sdata->local;
516
517 if (!wk->assoc.synced) {
518 int ret = drv_tx_sync(local, sdata, wk->filter_ta,
519 IEEE80211_TX_SYNC_ASSOC);
520 if (ret)
521 return WORK_ACT_TIMEOUT;
522 }
523 wk->assoc.synced = true;
524
525 wk->assoc.tries++;
526 if (wk->assoc.tries > IEEE80211_ASSOC_MAX_TRIES) {
527 printk(KERN_DEBUG "%s: association with %pM"
528 " timed out\n",
529 sdata->name, wk->filter_ta);
530
531 /*
532 * Most likely AP is not in the range so remove the
533 * bss struct for that AP.
534 */
535 if (wk->assoc.bss)
536 cfg80211_unlink_bss(local->hw.wiphy, wk->assoc.bss);
537
538 return WORK_ACT_TIMEOUT;
539 }
540
541 printk(KERN_DEBUG "%s: associate with %pM (try %d)\n",
542 sdata->name, wk->filter_ta, wk->assoc.tries);
543 ieee80211_send_assoc(sdata, wk);
544
545 wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
546 run_again(local, wk->timeout);
547
548 return WORK_ACT_NONE;
549 }
550
551 static enum work_action __must_check
552 ieee80211_remain_on_channel_timeout(struct ieee80211_work *wk)
553 {
554 /*
555 * First time we run, do nothing -- the generic code will
556 * have switched to the right channel etc.
557 */
558 if (!wk->started) {
559 wk->timeout = jiffies + msecs_to_jiffies(wk->remain.duration);
560
561 cfg80211_ready_on_channel(wk->sdata->dev, (unsigned long) wk,
562 wk->chan, wk->chan_type,
563 wk->remain.duration, GFP_KERNEL);
564
565 return WORK_ACT_NONE;
566 }
567
568 return WORK_ACT_TIMEOUT;
569 }
570
571 static enum work_action __must_check
572 ieee80211_offchannel_tx(struct ieee80211_work *wk)
573 {
574 if (!wk->started) {
575 wk->timeout = jiffies + msecs_to_jiffies(wk->offchan_tx.wait);
576
577 /*
578 * After this, offchan_tx.frame remains but now is no
579 * longer a valid pointer -- we still need it as the
580 * cookie for canceling this work/status matching.
581 */
582 ieee80211_tx_skb(wk->sdata, wk->offchan_tx.frame);
583
584 return WORK_ACT_NONE;
585 }
586
587 return WORK_ACT_TIMEOUT;
588 }
589
590 static enum work_action __must_check
591 ieee80211_assoc_beacon_wait(struct ieee80211_work *wk)
592 {
593 if (wk->started)
594 return WORK_ACT_TIMEOUT;
595
596 /*
597 * Wait up to one beacon interval ...
598 * should this be more if we miss one?
599 */
600 printk(KERN_DEBUG "%s: waiting for beacon from %pM\n",
601 wk->sdata->name, wk->filter_ta);
602 wk->timeout = TU_TO_EXP_TIME(wk->assoc.bss->beacon_interval);
603 return WORK_ACT_NONE;
604 }
605
606 static void ieee80211_auth_challenge(struct ieee80211_work *wk,
607 struct ieee80211_mgmt *mgmt,
608 size_t len)
609 {
610 struct ieee80211_sub_if_data *sdata = wk->sdata;
611 u8 *pos;
612 struct ieee802_11_elems elems;
613
614 pos = mgmt->u.auth.variable;
615 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
616 if (!elems.challenge)
617 return;
618 ieee80211_send_auth(sdata, 3, wk->probe_auth.algorithm,
619 elems.challenge - 2, elems.challenge_len + 2,
620 wk->filter_ta, wk->probe_auth.key,
621 wk->probe_auth.key_len, wk->probe_auth.key_idx);
622 wk->probe_auth.transaction = 4;
623 }
624
625 static enum work_action __must_check
626 ieee80211_rx_mgmt_auth(struct ieee80211_work *wk,
627 struct ieee80211_mgmt *mgmt, size_t len)
628 {
629 u16 auth_alg, auth_transaction, status_code;
630
631 if (wk->type != IEEE80211_WORK_AUTH)
632 return WORK_ACT_MISMATCH;
633
634 if (len < 24 + 6)
635 return WORK_ACT_NONE;
636
637 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
638 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
639 status_code = le16_to_cpu(mgmt->u.auth.status_code);
640
641 if (auth_alg != wk->probe_auth.algorithm ||
642 auth_transaction != wk->probe_auth.transaction)
643 return WORK_ACT_NONE;
644
645 if (status_code != WLAN_STATUS_SUCCESS) {
646 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
647 wk->sdata->name, mgmt->sa, status_code);
648 return WORK_ACT_DONE;
649 }
650
651 switch (wk->probe_auth.algorithm) {
652 case WLAN_AUTH_OPEN:
653 case WLAN_AUTH_LEAP:
654 case WLAN_AUTH_FT:
655 break;
656 case WLAN_AUTH_SHARED_KEY:
657 if (wk->probe_auth.transaction != 4) {
658 ieee80211_auth_challenge(wk, mgmt, len);
659 /* need another frame */
660 return WORK_ACT_NONE;
661 }
662 break;
663 default:
664 WARN_ON(1);
665 return WORK_ACT_NONE;
666 }
667
668 printk(KERN_DEBUG "%s: authenticated\n", wk->sdata->name);
669 return WORK_ACT_DONE;
670 }
671
672 static enum work_action __must_check
673 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_work *wk,
674 struct ieee80211_mgmt *mgmt, size_t len,
675 bool reassoc)
676 {
677 struct ieee80211_sub_if_data *sdata = wk->sdata;
678 struct ieee80211_local *local = sdata->local;
679 u16 capab_info, status_code, aid;
680 struct ieee802_11_elems elems;
681 u8 *pos;
682
683 if (wk->type != IEEE80211_WORK_ASSOC)
684 return WORK_ACT_MISMATCH;
685
686 /*
687 * AssocResp and ReassocResp have identical structure, so process both
688 * of them in this function.
689 */
690
691 if (len < 24 + 6)
692 return WORK_ACT_NONE;
693
694 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
695 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
696 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
697
698 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
699 "status=%d aid=%d)\n",
700 sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
701 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
702
703 pos = mgmt->u.assoc_resp.variable;
704 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
705
706 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
707 elems.timeout_int && elems.timeout_int_len == 5 &&
708 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
709 u32 tu, ms;
710 tu = get_unaligned_le32(elems.timeout_int + 1);
711 ms = tu * 1024 / 1000;
712 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
713 "comeback duration %u TU (%u ms)\n",
714 sdata->name, mgmt->sa, tu, ms);
715 wk->timeout = jiffies + msecs_to_jiffies(ms);
716 if (ms > IEEE80211_ASSOC_TIMEOUT)
717 run_again(local, wk->timeout);
718 return WORK_ACT_NONE;
719 }
720
721 if (status_code != WLAN_STATUS_SUCCESS)
722 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
723 sdata->name, mgmt->sa, status_code);
724 else
725 printk(KERN_DEBUG "%s: associated\n", sdata->name);
726
727 return WORK_ACT_DONE;
728 }
729
730 static enum work_action __must_check
731 ieee80211_rx_mgmt_probe_resp(struct ieee80211_work *wk,
732 struct ieee80211_mgmt *mgmt, size_t len,
733 struct ieee80211_rx_status *rx_status)
734 {
735 struct ieee80211_sub_if_data *sdata = wk->sdata;
736 struct ieee80211_local *local = sdata->local;
737 size_t baselen;
738
739 ASSERT_WORK_MTX(local);
740
741 if (wk->type != IEEE80211_WORK_DIRECT_PROBE)
742 return WORK_ACT_MISMATCH;
743
744 if (len < 24 + 12)
745 return WORK_ACT_NONE;
746
747 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
748 if (baselen > len)
749 return WORK_ACT_NONE;
750
751 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
752 return WORK_ACT_DONE;
753 }
754
755 static enum work_action __must_check
756 ieee80211_rx_mgmt_beacon(struct ieee80211_work *wk,
757 struct ieee80211_mgmt *mgmt, size_t len)
758 {
759 struct ieee80211_sub_if_data *sdata = wk->sdata;
760 struct ieee80211_local *local = sdata->local;
761
762 ASSERT_WORK_MTX(local);
763
764 if (wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
765 return WORK_ACT_MISMATCH;
766
767 if (len < 24 + 12)
768 return WORK_ACT_NONE;
769
770 printk(KERN_DEBUG "%s: beacon received\n", sdata->name);
771 return WORK_ACT_DONE;
772 }
773
774 static void ieee80211_work_rx_queued_mgmt(struct ieee80211_local *local,
775 struct sk_buff *skb)
776 {
777 struct ieee80211_rx_status *rx_status;
778 struct ieee80211_mgmt *mgmt;
779 struct ieee80211_work *wk;
780 enum work_action rma = WORK_ACT_NONE;
781 u16 fc;
782
783 rx_status = (struct ieee80211_rx_status *) skb->cb;
784 mgmt = (struct ieee80211_mgmt *) skb->data;
785 fc = le16_to_cpu(mgmt->frame_control);
786
787 mutex_lock(&local->mtx);
788
789 list_for_each_entry(wk, &local->work_list, list) {
790 const u8 *bssid = NULL;
791
792 switch (wk->type) {
793 case IEEE80211_WORK_DIRECT_PROBE:
794 case IEEE80211_WORK_AUTH:
795 case IEEE80211_WORK_ASSOC:
796 case IEEE80211_WORK_ASSOC_BEACON_WAIT:
797 bssid = wk->filter_ta;
798 break;
799 default:
800 continue;
801 }
802
803 /*
804 * Before queuing, we already verified mgmt->sa,
805 * so this is needed just for matching.
806 */
807 if (compare_ether_addr(bssid, mgmt->bssid))
808 continue;
809
810 switch (fc & IEEE80211_FCTL_STYPE) {
811 case IEEE80211_STYPE_BEACON:
812 rma = ieee80211_rx_mgmt_beacon(wk, mgmt, skb->len);
813 break;
814 case IEEE80211_STYPE_PROBE_RESP:
815 rma = ieee80211_rx_mgmt_probe_resp(wk, mgmt, skb->len,
816 rx_status);
817 break;
818 case IEEE80211_STYPE_AUTH:
819 rma = ieee80211_rx_mgmt_auth(wk, mgmt, skb->len);
820 break;
821 case IEEE80211_STYPE_ASSOC_RESP:
822 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
823 skb->len, false);
824 break;
825 case IEEE80211_STYPE_REASSOC_RESP:
826 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
827 skb->len, true);
828 break;
829 default:
830 WARN_ON(1);
831 rma = WORK_ACT_NONE;
832 }
833
834 /*
835 * We've either received an unexpected frame, or we have
836 * multiple work items and need to match the frame to the
837 * right one.
838 */
839 if (rma == WORK_ACT_MISMATCH)
840 continue;
841
842 /*
843 * We've processed this frame for that work, so it can't
844 * belong to another work struct.
845 * NB: this is also required for correctness for 'rma'!
846 */
847 break;
848 }
849
850 switch (rma) {
851 case WORK_ACT_MISMATCH:
852 /* ignore this unmatched frame */
853 break;
854 case WORK_ACT_NONE:
855 break;
856 case WORK_ACT_DONE:
857 list_del_rcu(&wk->list);
858 break;
859 default:
860 WARN(1, "unexpected: %d", rma);
861 }
862
863 mutex_unlock(&local->mtx);
864
865 if (rma != WORK_ACT_DONE)
866 goto out;
867
868 switch (wk->done(wk, skb)) {
869 case WORK_DONE_DESTROY:
870 free_work(wk);
871 break;
872 case WORK_DONE_REQUEUE:
873 synchronize_rcu();
874 wk->started = false; /* restart */
875 mutex_lock(&local->mtx);
876 list_add_tail(&wk->list, &local->work_list);
877 mutex_unlock(&local->mtx);
878 }
879
880 out:
881 kfree_skb(skb);
882 }
883
884 static bool ieee80211_work_ct_coexists(enum nl80211_channel_type wk_ct,
885 enum nl80211_channel_type oper_ct)
886 {
887 switch (wk_ct) {
888 case NL80211_CHAN_NO_HT:
889 return true;
890 case NL80211_CHAN_HT20:
891 if (oper_ct != NL80211_CHAN_NO_HT)
892 return true;
893 return false;
894 case NL80211_CHAN_HT40MINUS:
895 case NL80211_CHAN_HT40PLUS:
896 return (wk_ct == oper_ct);
897 }
898 WARN_ON(1); /* shouldn't get here */
899 return false;
900 }
901
902 static enum nl80211_channel_type
903 ieee80211_calc_ct(enum nl80211_channel_type wk_ct,
904 enum nl80211_channel_type oper_ct)
905 {
906 switch (wk_ct) {
907 case NL80211_CHAN_NO_HT:
908 return oper_ct;
909 case NL80211_CHAN_HT20:
910 if (oper_ct != NL80211_CHAN_NO_HT)
911 return oper_ct;
912 return wk_ct;
913 case NL80211_CHAN_HT40MINUS:
914 case NL80211_CHAN_HT40PLUS:
915 return wk_ct;
916 }
917 WARN_ON(1); /* shouldn't get here */
918 return wk_ct;
919 }
920
921
922 static void ieee80211_work_timer(unsigned long data)
923 {
924 struct ieee80211_local *local = (void *) data;
925
926 if (local->quiescing)
927 return;
928
929 ieee80211_queue_work(&local->hw, &local->work_work);
930 }
931
932 static void ieee80211_work_work(struct work_struct *work)
933 {
934 struct ieee80211_local *local =
935 container_of(work, struct ieee80211_local, work_work);
936 struct sk_buff *skb;
937 struct ieee80211_work *wk, *tmp;
938 LIST_HEAD(free_work);
939 enum work_action rma;
940 bool remain_off_channel = false;
941
942 if (local->scanning)
943 return;
944
945 /*
946 * ieee80211_queue_work() should have picked up most cases,
947 * here we'll pick the rest.
948 */
949 if (WARN(local->suspended, "work scheduled while going to suspend\n"))
950 return;
951
952 /* first process frames to avoid timing out while a frame is pending */
953 while ((skb = skb_dequeue(&local->work_skb_queue)))
954 ieee80211_work_rx_queued_mgmt(local, skb);
955
956 mutex_lock(&local->mtx);
957
958 ieee80211_recalc_idle(local);
959
960 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
961 bool started = wk->started;
962
963 /* mark work as started if it's on the current off-channel */
964 if (!started && local->tmp_channel &&
965 wk->chan == local->tmp_channel &&
966 wk->chan_type == local->tmp_channel_type) {
967 started = true;
968 wk->timeout = jiffies;
969 }
970
971 if (!started && !local->tmp_channel) {
972 bool on_oper_chan;
973 bool tmp_chan_changed = false;
974 bool on_oper_chan2;
975 enum nl80211_channel_type wk_ct;
976 on_oper_chan = ieee80211_cfg_on_oper_channel(local);
977
978 /* Work with existing channel type if possible. */
979 wk_ct = wk->chan_type;
980 if (wk->chan == local->hw.conf.channel)
981 wk_ct = ieee80211_calc_ct(wk->chan_type,
982 local->hw.conf.channel_type);
983
984 if (local->tmp_channel)
985 if ((local->tmp_channel != wk->chan) ||
986 (local->tmp_channel_type != wk_ct))
987 tmp_chan_changed = true;
988
989 local->tmp_channel = wk->chan;
990 local->tmp_channel_type = wk_ct;
991 /*
992 * Leave the station vifs in awake mode if they
993 * happen to be on the same channel as
994 * the requested channel.
995 */
996 on_oper_chan2 = ieee80211_cfg_on_oper_channel(local);
997 if (on_oper_chan != on_oper_chan2) {
998 if (on_oper_chan2) {
999 /* going off oper channel, PS too */
1000 ieee80211_offchannel_stop_vifs(local,
1001 true);
1002 ieee80211_hw_config(local, 0);
1003 } else {
1004 /* going on channel, but leave PS
1005 * off-channel. */
1006 ieee80211_hw_config(local, 0);
1007 ieee80211_offchannel_return(local,
1008 true,
1009 false);
1010 }
1011 } else if (tmp_chan_changed)
1012 /* Still off-channel, but on some other
1013 * channel, so update hardware.
1014 * PS should already be off-channel.
1015 */
1016 ieee80211_hw_config(local, 0);
1017
1018 started = true;
1019 wk->timeout = jiffies;
1020 }
1021
1022 /* don't try to work with items that aren't started */
1023 if (!started)
1024 continue;
1025
1026 if (time_is_after_jiffies(wk->timeout)) {
1027 /*
1028 * This work item isn't supposed to be worked on
1029 * right now, but take care to adjust the timer
1030 * properly.
1031 */
1032 run_again(local, wk->timeout);
1033 continue;
1034 }
1035
1036 switch (wk->type) {
1037 default:
1038 WARN_ON(1);
1039 /* nothing */
1040 rma = WORK_ACT_NONE;
1041 break;
1042 case IEEE80211_WORK_ABORT:
1043 rma = WORK_ACT_TIMEOUT;
1044 break;
1045 case IEEE80211_WORK_DIRECT_PROBE:
1046 rma = ieee80211_direct_probe(wk);
1047 break;
1048 case IEEE80211_WORK_AUTH:
1049 rma = ieee80211_authenticate(wk);
1050 break;
1051 case IEEE80211_WORK_ASSOC:
1052 rma = ieee80211_associate(wk);
1053 break;
1054 case IEEE80211_WORK_REMAIN_ON_CHANNEL:
1055 rma = ieee80211_remain_on_channel_timeout(wk);
1056 break;
1057 case IEEE80211_WORK_OFFCHANNEL_TX:
1058 rma = ieee80211_offchannel_tx(wk);
1059 break;
1060 case IEEE80211_WORK_ASSOC_BEACON_WAIT:
1061 rma = ieee80211_assoc_beacon_wait(wk);
1062 break;
1063 }
1064
1065 wk->started = started;
1066
1067 switch (rma) {
1068 case WORK_ACT_NONE:
1069 /* might have changed the timeout */
1070 run_again(local, wk->timeout);
1071 break;
1072 case WORK_ACT_TIMEOUT:
1073 list_del_rcu(&wk->list);
1074 synchronize_rcu();
1075 list_add(&wk->list, &free_work);
1076 break;
1077 default:
1078 WARN(1, "unexpected: %d", rma);
1079 }
1080 }
1081
1082 list_for_each_entry(wk, &local->work_list, list) {
1083 if (!wk->started)
1084 continue;
1085 if (wk->chan != local->tmp_channel)
1086 continue;
1087 if (ieee80211_work_ct_coexists(wk->chan_type,
1088 local->tmp_channel_type))
1089 continue;
1090 remain_off_channel = true;
1091 }
1092
1093 if (!remain_off_channel && local->tmp_channel) {
1094 bool on_oper_chan = ieee80211_cfg_on_oper_channel(local);
1095 local->tmp_channel = NULL;
1096 /* If tmp_channel wasn't operating channel, then
1097 * we need to go back on-channel.
1098 * NOTE: If we can ever be here while scannning,
1099 * or if the hw_config() channel config logic changes,
1100 * then we may need to do a more thorough check to see if
1101 * we still need to do a hardware config. Currently,
1102 * we cannot be here while scanning, however.
1103 */
1104 if (ieee80211_cfg_on_oper_channel(local) && !on_oper_chan)
1105 ieee80211_hw_config(local, 0);
1106
1107 /* At the least, we need to disable offchannel_ps,
1108 * so just go ahead and run the entire offchannel
1109 * return logic here. We *could* skip enabling
1110 * beaconing if we were already on-oper-channel
1111 * as a future optimization.
1112 */
1113 ieee80211_offchannel_return(local, true, true);
1114
1115 /* give connection some time to breathe */
1116 run_again(local, jiffies + HZ/2);
1117 }
1118
1119 if (list_empty(&local->work_list) && local->scan_req &&
1120 !local->scanning)
1121 ieee80211_queue_delayed_work(&local->hw,
1122 &local->scan_work,
1123 round_jiffies_relative(0));
1124
1125 ieee80211_recalc_idle(local);
1126
1127 mutex_unlock(&local->mtx);
1128
1129 list_for_each_entry_safe(wk, tmp, &free_work, list) {
1130 wk->done(wk, NULL);
1131 list_del(&wk->list);
1132 kfree(wk);
1133 }
1134 }
1135
1136 void ieee80211_add_work(struct ieee80211_work *wk)
1137 {
1138 struct ieee80211_local *local;
1139
1140 if (WARN_ON(!wk->chan))
1141 return;
1142
1143 if (WARN_ON(!wk->sdata))
1144 return;
1145
1146 if (WARN_ON(!wk->done))
1147 return;
1148
1149 if (WARN_ON(!ieee80211_sdata_running(wk->sdata)))
1150 return;
1151
1152 wk->started = false;
1153
1154 local = wk->sdata->local;
1155 mutex_lock(&local->mtx);
1156 list_add_tail(&wk->list, &local->work_list);
1157 mutex_unlock(&local->mtx);
1158
1159 ieee80211_queue_work(&local->hw, &local->work_work);
1160 }
1161
1162 void ieee80211_work_init(struct ieee80211_local *local)
1163 {
1164 INIT_LIST_HEAD(&local->work_list);
1165 setup_timer(&local->work_timer, ieee80211_work_timer,
1166 (unsigned long)local);
1167 INIT_WORK(&local->work_work, ieee80211_work_work);
1168 skb_queue_head_init(&local->work_skb_queue);
1169 }
1170
1171 void ieee80211_work_purge(struct ieee80211_sub_if_data *sdata)
1172 {
1173 struct ieee80211_local *local = sdata->local;
1174 struct ieee80211_work *wk;
1175 bool cleanup = false;
1176
1177 mutex_lock(&local->mtx);
1178 list_for_each_entry(wk, &local->work_list, list) {
1179 if (wk->sdata != sdata)
1180 continue;
1181 cleanup = true;
1182 wk->type = IEEE80211_WORK_ABORT;
1183 wk->started = true;
1184 wk->timeout = jiffies;
1185 }
1186 mutex_unlock(&local->mtx);
1187
1188 /* run cleanups etc. */
1189 if (cleanup)
1190 ieee80211_work_work(&local->work_work);
1191
1192 mutex_lock(&local->mtx);
1193 list_for_each_entry(wk, &local->work_list, list) {
1194 if (wk->sdata != sdata)
1195 continue;
1196 WARN_ON(1);
1197 break;
1198 }
1199 mutex_unlock(&local->mtx);
1200 }
1201
1202 ieee80211_rx_result ieee80211_work_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1203 struct sk_buff *skb)
1204 {
1205 struct ieee80211_local *local = sdata->local;
1206 struct ieee80211_mgmt *mgmt;
1207 struct ieee80211_work *wk;
1208 u16 fc;
1209
1210 if (skb->len < 24)
1211 return RX_DROP_MONITOR;
1212
1213 mgmt = (struct ieee80211_mgmt *) skb->data;
1214 fc = le16_to_cpu(mgmt->frame_control);
1215
1216 list_for_each_entry_rcu(wk, &local->work_list, list) {
1217 if (sdata != wk->sdata)
1218 continue;
1219 if (compare_ether_addr(wk->filter_ta, mgmt->sa))
1220 continue;
1221 if (compare_ether_addr(wk->filter_ta, mgmt->bssid))
1222 continue;
1223
1224 switch (fc & IEEE80211_FCTL_STYPE) {
1225 case IEEE80211_STYPE_AUTH:
1226 case IEEE80211_STYPE_PROBE_RESP:
1227 case IEEE80211_STYPE_ASSOC_RESP:
1228 case IEEE80211_STYPE_REASSOC_RESP:
1229 case IEEE80211_STYPE_BEACON:
1230 skb_queue_tail(&local->work_skb_queue, skb);
1231 ieee80211_queue_work(&local->hw, &local->work_work);
1232 return RX_QUEUED;
1233 }
1234 }
1235
1236 return RX_CONTINUE;
1237 }
1238
1239 static enum work_done_result ieee80211_remain_done(struct ieee80211_work *wk,
1240 struct sk_buff *skb)
1241 {
1242 /*
1243 * We are done serving the remain-on-channel command.
1244 */
1245 cfg80211_remain_on_channel_expired(wk->sdata->dev, (unsigned long) wk,
1246 wk->chan, wk->chan_type,
1247 GFP_KERNEL);
1248
1249 return WORK_DONE_DESTROY;
1250 }
1251
1252 int ieee80211_wk_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1253 struct ieee80211_channel *chan,
1254 enum nl80211_channel_type channel_type,
1255 unsigned int duration, u64 *cookie)
1256 {
1257 struct ieee80211_work *wk;
1258
1259 wk = kzalloc(sizeof(*wk), GFP_KERNEL);
1260 if (!wk)
1261 return -ENOMEM;
1262
1263 wk->type = IEEE80211_WORK_REMAIN_ON_CHANNEL;
1264 wk->chan = chan;
1265 wk->chan_type = channel_type;
1266 wk->sdata = sdata;
1267 wk->done = ieee80211_remain_done;
1268
1269 wk->remain.duration = duration;
1270
1271 *cookie = (unsigned long) wk;
1272
1273 ieee80211_add_work(wk);
1274
1275 return 0;
1276 }
1277
1278 int ieee80211_wk_cancel_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1279 u64 cookie)
1280 {
1281 struct ieee80211_local *local = sdata->local;
1282 struct ieee80211_work *wk, *tmp;
1283 bool found = false;
1284
1285 mutex_lock(&local->mtx);
1286 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
1287 if ((unsigned long) wk == cookie) {
1288 wk->timeout = jiffies;
1289 found = true;
1290 break;
1291 }
1292 }
1293 mutex_unlock(&local->mtx);
1294
1295 if (!found)
1296 return -ENOENT;
1297
1298 ieee80211_queue_work(&local->hw, &local->work_work);
1299
1300 return 0;
1301 }
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