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mac80211: sync driver before TX
[deliverable/linux.git] / net / mac80211 / work.c
1 /*
2 * mac80211 work implementation
3 *
4 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
5 * Copyright 2004, Instant802 Networks, Inc.
6 * Copyright 2005, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
9 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16 #include <linux/delay.h>
17 #include <linux/if_ether.h>
18 #include <linux/skbuff.h>
19 #include <linux/if_arp.h>
20 #include <linux/etherdevice.h>
21 #include <linux/crc32.h>
22 #include <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 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
234 "frame\n", sdata->name);
235 return;
236 }
237 skb_reserve(skb, local->hw.extra_tx_headroom);
238
239 capab = WLAN_CAPABILITY_ESS;
240
241 if (sband->band == IEEE80211_BAND_2GHZ) {
242 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
243 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
244 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
245 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
246 }
247
248 if (wk->assoc.capability & WLAN_CAPABILITY_PRIVACY)
249 capab |= WLAN_CAPABILITY_PRIVACY;
250
251 if ((wk->assoc.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
252 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
253 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
254
255 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
256 memset(mgmt, 0, 24);
257 memcpy(mgmt->da, wk->filter_ta, ETH_ALEN);
258 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
259 memcpy(mgmt->bssid, wk->filter_ta, ETH_ALEN);
260
261 if (!is_zero_ether_addr(wk->assoc.prev_bssid)) {
262 skb_put(skb, 10);
263 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
264 IEEE80211_STYPE_REASSOC_REQ);
265 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
266 mgmt->u.reassoc_req.listen_interval =
267 cpu_to_le16(local->hw.conf.listen_interval);
268 memcpy(mgmt->u.reassoc_req.current_ap, wk->assoc.prev_bssid,
269 ETH_ALEN);
270 } else {
271 skb_put(skb, 4);
272 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
273 IEEE80211_STYPE_ASSOC_REQ);
274 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
275 mgmt->u.assoc_req.listen_interval =
276 cpu_to_le16(local->hw.conf.listen_interval);
277 }
278
279 /* SSID */
280 pos = skb_put(skb, 2 + wk->assoc.ssid_len);
281 *pos++ = WLAN_EID_SSID;
282 *pos++ = wk->assoc.ssid_len;
283 memcpy(pos, wk->assoc.ssid, wk->assoc.ssid_len);
284
285 /* add all rates which were marked to be used above */
286 supp_rates_len = rates_len;
287 if (supp_rates_len > 8)
288 supp_rates_len = 8;
289
290 pos = skb_put(skb, supp_rates_len + 2);
291 *pos++ = WLAN_EID_SUPP_RATES;
292 *pos++ = supp_rates_len;
293
294 count = 0;
295 for (i = 0; i < sband->n_bitrates; i++) {
296 if (BIT(i) & rates) {
297 int rate = sband->bitrates[i].bitrate;
298 *pos++ = (u8) (rate / 5);
299 if (++count == 8)
300 break;
301 }
302 }
303
304 if (rates_len > count) {
305 pos = skb_put(skb, rates_len - count + 2);
306 *pos++ = WLAN_EID_EXT_SUPP_RATES;
307 *pos++ = rates_len - count;
308
309 for (i++; i < sband->n_bitrates; i++) {
310 if (BIT(i) & rates) {
311 int rate = sband->bitrates[i].bitrate;
312 *pos++ = (u8) (rate / 5);
313 }
314 }
315 }
316
317 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
318 /* 1. power capabilities */
319 pos = skb_put(skb, 4);
320 *pos++ = WLAN_EID_PWR_CAPABILITY;
321 *pos++ = 2;
322 *pos++ = 0; /* min tx power */
323 *pos++ = wk->chan->max_power; /* max tx power */
324
325 /* 2. supported channels */
326 /* TODO: get this in reg domain format */
327 pos = skb_put(skb, 2 * sband->n_channels + 2);
328 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
329 *pos++ = 2 * sband->n_channels;
330 for (i = 0; i < sband->n_channels; i++) {
331 *pos++ = ieee80211_frequency_to_channel(
332 sband->channels[i].center_freq);
333 *pos++ = 1; /* one channel in the subband*/
334 }
335 }
336
337 /* if present, add any custom IEs that go before HT */
338 if (wk->ie_len && wk->ie) {
339 static const u8 before_ht[] = {
340 WLAN_EID_SSID,
341 WLAN_EID_SUPP_RATES,
342 WLAN_EID_EXT_SUPP_RATES,
343 WLAN_EID_PWR_CAPABILITY,
344 WLAN_EID_SUPPORTED_CHANNELS,
345 WLAN_EID_RSN,
346 WLAN_EID_QOS_CAPA,
347 WLAN_EID_RRM_ENABLED_CAPABILITIES,
348 WLAN_EID_MOBILITY_DOMAIN,
349 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
350 };
351 noffset = ieee80211_ie_split(wk->ie, wk->ie_len,
352 before_ht, ARRAY_SIZE(before_ht),
353 offset);
354 pos = skb_put(skb, noffset - offset);
355 memcpy(pos, wk->ie + offset, noffset - offset);
356 offset = noffset;
357 }
358
359 if (wk->assoc.use_11n && wk->assoc.wmm_used &&
360 local->hw.queues >= 4)
361 ieee80211_add_ht_ie(skb, wk->assoc.ht_information_ie,
362 sband, wk->chan, wk->assoc.smps);
363
364 /* if present, add any custom non-vendor IEs that go after HT */
365 if (wk->ie_len && wk->ie) {
366 noffset = ieee80211_ie_split_vendor(wk->ie, wk->ie_len,
367 offset);
368 pos = skb_put(skb, noffset - offset);
369 memcpy(pos, wk->ie + offset, noffset - offset);
370 offset = noffset;
371 }
372
373 if (wk->assoc.wmm_used && local->hw.queues >= 4) {
374 if (wk->assoc.uapsd_used) {
375 qos_info = local->uapsd_queues;
376 qos_info |= (local->uapsd_max_sp_len <<
377 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
378 } else {
379 qos_info = 0;
380 }
381
382 pos = skb_put(skb, 9);
383 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
384 *pos++ = 7; /* len */
385 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
386 *pos++ = 0x50;
387 *pos++ = 0xf2;
388 *pos++ = 2; /* WME */
389 *pos++ = 0; /* WME info */
390 *pos++ = 1; /* WME ver */
391 *pos++ = qos_info;
392 }
393
394 /* add any remaining custom (i.e. vendor specific here) IEs */
395 if (wk->ie_len && wk->ie) {
396 noffset = wk->ie_len;
397 pos = skb_put(skb, noffset - offset);
398 memcpy(pos, wk->ie + offset, noffset - offset);
399 }
400
401 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
402 ieee80211_tx_skb(sdata, skb);
403 }
404
405 static void ieee80211_remove_auth_bss(struct ieee80211_local *local,
406 struct ieee80211_work *wk)
407 {
408 struct cfg80211_bss *cbss;
409 u16 capa_val = WLAN_CAPABILITY_ESS;
410
411 if (wk->probe_auth.privacy)
412 capa_val |= WLAN_CAPABILITY_PRIVACY;
413
414 cbss = cfg80211_get_bss(local->hw.wiphy, wk->chan, wk->filter_ta,
415 wk->probe_auth.ssid, wk->probe_auth.ssid_len,
416 WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
417 capa_val);
418 if (!cbss)
419 return;
420
421 cfg80211_unlink_bss(local->hw.wiphy, cbss);
422 cfg80211_put_bss(cbss);
423 }
424
425 static enum work_action __must_check
426 ieee80211_direct_probe(struct ieee80211_work *wk)
427 {
428 struct ieee80211_sub_if_data *sdata = wk->sdata;
429 struct ieee80211_local *local = sdata->local;
430
431 if (!wk->probe_auth.synced) {
432 int ret = drv_tx_sync(local, sdata, wk->filter_ta,
433 IEEE80211_TX_SYNC_AUTH);
434 if (ret)
435 return WORK_ACT_TIMEOUT;
436 }
437 wk->probe_auth.synced = true;
438
439 wk->probe_auth.tries++;
440 if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
441 printk(KERN_DEBUG "%s: direct probe to %pM timed out\n",
442 sdata->name, wk->filter_ta);
443
444 /*
445 * Most likely AP is not in the range so remove the
446 * bss struct for that AP.
447 */
448 ieee80211_remove_auth_bss(local, wk);
449
450 return WORK_ACT_TIMEOUT;
451 }
452
453 printk(KERN_DEBUG "%s: direct probe to %pM (try %d/%i)\n",
454 sdata->name, wk->filter_ta, wk->probe_auth.tries,
455 IEEE80211_AUTH_MAX_TRIES);
456
457 /*
458 * Direct probe is sent to broadcast address as some APs
459 * will not answer to direct packet in unassociated state.
460 */
461 ieee80211_send_probe_req(sdata, NULL, wk->probe_auth.ssid,
462 wk->probe_auth.ssid_len, NULL, 0,
463 (u32) -1, true);
464
465 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
466 run_again(local, wk->timeout);
467
468 return WORK_ACT_NONE;
469 }
470
471
472 static enum work_action __must_check
473 ieee80211_authenticate(struct ieee80211_work *wk)
474 {
475 struct ieee80211_sub_if_data *sdata = wk->sdata;
476 struct ieee80211_local *local = sdata->local;
477
478 if (!wk->probe_auth.synced) {
479 int ret = drv_tx_sync(local, sdata, wk->filter_ta,
480 IEEE80211_TX_SYNC_AUTH);
481 if (ret)
482 return WORK_ACT_TIMEOUT;
483 }
484 wk->probe_auth.synced = true;
485
486 wk->probe_auth.tries++;
487 if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
488 printk(KERN_DEBUG "%s: authentication with %pM"
489 " timed out\n", sdata->name, wk->filter_ta);
490
491 /*
492 * Most likely AP is not in the range so remove the
493 * bss struct for that AP.
494 */
495 ieee80211_remove_auth_bss(local, wk);
496
497 return WORK_ACT_TIMEOUT;
498 }
499
500 printk(KERN_DEBUG "%s: authenticate with %pM (try %d)\n",
501 sdata->name, wk->filter_ta, wk->probe_auth.tries);
502
503 ieee80211_send_auth(sdata, 1, wk->probe_auth.algorithm, wk->ie,
504 wk->ie_len, wk->filter_ta, NULL, 0, 0);
505 wk->probe_auth.transaction = 2;
506
507 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
508 run_again(local, wk->timeout);
509
510 return WORK_ACT_NONE;
511 }
512
513 static enum work_action __must_check
514 ieee80211_associate(struct ieee80211_work *wk)
515 {
516 struct ieee80211_sub_if_data *sdata = wk->sdata;
517 struct ieee80211_local *local = sdata->local;
518
519 if (!wk->assoc.synced) {
520 int ret = drv_tx_sync(local, sdata, wk->filter_ta,
521 IEEE80211_TX_SYNC_ASSOC);
522 if (ret)
523 return WORK_ACT_TIMEOUT;
524 }
525 wk->assoc.synced = true;
526
527 wk->assoc.tries++;
528 if (wk->assoc.tries > IEEE80211_ASSOC_MAX_TRIES) {
529 printk(KERN_DEBUG "%s: association with %pM"
530 " timed out\n",
531 sdata->name, wk->filter_ta);
532
533 /*
534 * Most likely AP is not in the range so remove the
535 * bss struct for that AP.
536 */
537 if (wk->assoc.bss)
538 cfg80211_unlink_bss(local->hw.wiphy, wk->assoc.bss);
539
540 return WORK_ACT_TIMEOUT;
541 }
542
543 printk(KERN_DEBUG "%s: associate with %pM (try %d)\n",
544 sdata->name, wk->filter_ta, wk->assoc.tries);
545 ieee80211_send_assoc(sdata, wk);
546
547 wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
548 run_again(local, wk->timeout);
549
550 return WORK_ACT_NONE;
551 }
552
553 static enum work_action __must_check
554 ieee80211_remain_on_channel_timeout(struct ieee80211_work *wk)
555 {
556 /*
557 * First time we run, do nothing -- the generic code will
558 * have switched to the right channel etc.
559 */
560 if (!wk->started) {
561 wk->timeout = jiffies + msecs_to_jiffies(wk->remain.duration);
562
563 cfg80211_ready_on_channel(wk->sdata->dev, (unsigned long) wk,
564 wk->chan, wk->chan_type,
565 wk->remain.duration, GFP_KERNEL);
566
567 return WORK_ACT_NONE;
568 }
569
570 return WORK_ACT_TIMEOUT;
571 }
572
573 static enum work_action __must_check
574 ieee80211_offchannel_tx(struct ieee80211_work *wk)
575 {
576 if (!wk->started) {
577 wk->timeout = jiffies + msecs_to_jiffies(wk->offchan_tx.wait);
578
579 /*
580 * After this, offchan_tx.frame remains but now is no
581 * longer a valid pointer -- we still need it as the
582 * cookie for canceling this work.
583 */
584 ieee80211_tx_skb(wk->sdata, wk->offchan_tx.frame);
585
586 return WORK_ACT_NONE;
587 }
588
589 return WORK_ACT_TIMEOUT;
590 }
591
592 static enum work_action __must_check
593 ieee80211_assoc_beacon_wait(struct ieee80211_work *wk)
594 {
595 if (wk->started)
596 return WORK_ACT_TIMEOUT;
597
598 /*
599 * Wait up to one beacon interval ...
600 * should this be more if we miss one?
601 */
602 printk(KERN_DEBUG "%s: waiting for beacon from %pM\n",
603 wk->sdata->name, wk->filter_ta);
604 wk->timeout = TU_TO_EXP_TIME(wk->assoc.bss->beacon_interval);
605 return WORK_ACT_NONE;
606 }
607
608 static void ieee80211_auth_challenge(struct ieee80211_work *wk,
609 struct ieee80211_mgmt *mgmt,
610 size_t len)
611 {
612 struct ieee80211_sub_if_data *sdata = wk->sdata;
613 u8 *pos;
614 struct ieee802_11_elems elems;
615
616 pos = mgmt->u.auth.variable;
617 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
618 if (!elems.challenge)
619 return;
620 ieee80211_send_auth(sdata, 3, wk->probe_auth.algorithm,
621 elems.challenge - 2, elems.challenge_len + 2,
622 wk->filter_ta, wk->probe_auth.key,
623 wk->probe_auth.key_len, wk->probe_auth.key_idx);
624 wk->probe_auth.transaction = 4;
625 }
626
627 static enum work_action __must_check
628 ieee80211_rx_mgmt_auth(struct ieee80211_work *wk,
629 struct ieee80211_mgmt *mgmt, size_t len)
630 {
631 u16 auth_alg, auth_transaction, status_code;
632
633 if (wk->type != IEEE80211_WORK_AUTH)
634 return WORK_ACT_MISMATCH;
635
636 if (len < 24 + 6)
637 return WORK_ACT_NONE;
638
639 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
640 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
641 status_code = le16_to_cpu(mgmt->u.auth.status_code);
642
643 if (auth_alg != wk->probe_auth.algorithm ||
644 auth_transaction != wk->probe_auth.transaction)
645 return WORK_ACT_NONE;
646
647 if (status_code != WLAN_STATUS_SUCCESS) {
648 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
649 wk->sdata->name, mgmt->sa, status_code);
650 return WORK_ACT_DONE;
651 }
652
653 switch (wk->probe_auth.algorithm) {
654 case WLAN_AUTH_OPEN:
655 case WLAN_AUTH_LEAP:
656 case WLAN_AUTH_FT:
657 break;
658 case WLAN_AUTH_SHARED_KEY:
659 if (wk->probe_auth.transaction != 4) {
660 ieee80211_auth_challenge(wk, mgmt, len);
661 /* need another frame */
662 return WORK_ACT_NONE;
663 }
664 break;
665 default:
666 WARN_ON(1);
667 return WORK_ACT_NONE;
668 }
669
670 printk(KERN_DEBUG "%s: authenticated\n", wk->sdata->name);
671 return WORK_ACT_DONE;
672 }
673
674 static enum work_action __must_check
675 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_work *wk,
676 struct ieee80211_mgmt *mgmt, size_t len,
677 bool reassoc)
678 {
679 struct ieee80211_sub_if_data *sdata = wk->sdata;
680 struct ieee80211_local *local = sdata->local;
681 u16 capab_info, status_code, aid;
682 struct ieee802_11_elems elems;
683 u8 *pos;
684
685 if (wk->type != IEEE80211_WORK_ASSOC)
686 return WORK_ACT_MISMATCH;
687
688 /*
689 * AssocResp and ReassocResp have identical structure, so process both
690 * of them in this function.
691 */
692
693 if (len < 24 + 6)
694 return WORK_ACT_NONE;
695
696 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
697 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
698 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
699
700 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
701 "status=%d aid=%d)\n",
702 sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
703 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
704
705 pos = mgmt->u.assoc_resp.variable;
706 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
707
708 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
709 elems.timeout_int && elems.timeout_int_len == 5 &&
710 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
711 u32 tu, ms;
712 tu = get_unaligned_le32(elems.timeout_int + 1);
713 ms = tu * 1024 / 1000;
714 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
715 "comeback duration %u TU (%u ms)\n",
716 sdata->name, mgmt->sa, tu, ms);
717 wk->timeout = jiffies + msecs_to_jiffies(ms);
718 if (ms > IEEE80211_ASSOC_TIMEOUT)
719 run_again(local, wk->timeout);
720 return WORK_ACT_NONE;
721 }
722
723 if (status_code != WLAN_STATUS_SUCCESS)
724 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
725 sdata->name, mgmt->sa, status_code);
726 else
727 printk(KERN_DEBUG "%s: associated\n", sdata->name);
728
729 return WORK_ACT_DONE;
730 }
731
732 static enum work_action __must_check
733 ieee80211_rx_mgmt_probe_resp(struct ieee80211_work *wk,
734 struct ieee80211_mgmt *mgmt, size_t len,
735 struct ieee80211_rx_status *rx_status)
736 {
737 struct ieee80211_sub_if_data *sdata = wk->sdata;
738 struct ieee80211_local *local = sdata->local;
739 size_t baselen;
740
741 ASSERT_WORK_MTX(local);
742
743 if (wk->type != IEEE80211_WORK_DIRECT_PROBE)
744 return WORK_ACT_MISMATCH;
745
746 if (len < 24 + 12)
747 return WORK_ACT_NONE;
748
749 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
750 if (baselen > len)
751 return WORK_ACT_NONE;
752
753 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
754 return WORK_ACT_DONE;
755 }
756
757 static enum work_action __must_check
758 ieee80211_rx_mgmt_beacon(struct ieee80211_work *wk,
759 struct ieee80211_mgmt *mgmt, size_t len)
760 {
761 struct ieee80211_sub_if_data *sdata = wk->sdata;
762 struct ieee80211_local *local = sdata->local;
763
764 ASSERT_WORK_MTX(local);
765
766 if (wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
767 return WORK_ACT_MISMATCH;
768
769 if (len < 24 + 12)
770 return WORK_ACT_NONE;
771
772 printk(KERN_DEBUG "%s: beacon received\n", sdata->name);
773 return WORK_ACT_DONE;
774 }
775
776 static void ieee80211_work_rx_queued_mgmt(struct ieee80211_local *local,
777 struct sk_buff *skb)
778 {
779 struct ieee80211_rx_status *rx_status;
780 struct ieee80211_mgmt *mgmt;
781 struct ieee80211_work *wk;
782 enum work_action rma = WORK_ACT_NONE;
783 u16 fc;
784
785 rx_status = (struct ieee80211_rx_status *) skb->cb;
786 mgmt = (struct ieee80211_mgmt *) skb->data;
787 fc = le16_to_cpu(mgmt->frame_control);
788
789 mutex_lock(&local->mtx);
790
791 list_for_each_entry(wk, &local->work_list, list) {
792 const u8 *bssid = NULL;
793
794 switch (wk->type) {
795 case IEEE80211_WORK_DIRECT_PROBE:
796 case IEEE80211_WORK_AUTH:
797 case IEEE80211_WORK_ASSOC:
798 case IEEE80211_WORK_ASSOC_BEACON_WAIT:
799 bssid = wk->filter_ta;
800 break;
801 default:
802 continue;
803 }
804
805 /*
806 * Before queuing, we already verified mgmt->sa,
807 * so this is needed just for matching.
808 */
809 if (compare_ether_addr(bssid, mgmt->bssid))
810 continue;
811
812 switch (fc & IEEE80211_FCTL_STYPE) {
813 case IEEE80211_STYPE_BEACON:
814 rma = ieee80211_rx_mgmt_beacon(wk, mgmt, skb->len);
815 break;
816 case IEEE80211_STYPE_PROBE_RESP:
817 rma = ieee80211_rx_mgmt_probe_resp(wk, mgmt, skb->len,
818 rx_status);
819 break;
820 case IEEE80211_STYPE_AUTH:
821 rma = ieee80211_rx_mgmt_auth(wk, mgmt, skb->len);
822 break;
823 case IEEE80211_STYPE_ASSOC_RESP:
824 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
825 skb->len, false);
826 break;
827 case IEEE80211_STYPE_REASSOC_RESP:
828 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
829 skb->len, true);
830 break;
831 default:
832 WARN_ON(1);
833 rma = WORK_ACT_NONE;
834 }
835
836 /*
837 * We've either received an unexpected frame, or we have
838 * multiple work items and need to match the frame to the
839 * right one.
840 */
841 if (rma == WORK_ACT_MISMATCH)
842 continue;
843
844 /*
845 * We've processed this frame for that work, so it can't
846 * belong to another work struct.
847 * NB: this is also required for correctness for 'rma'!
848 */
849 break;
850 }
851
852 switch (rma) {
853 case WORK_ACT_MISMATCH:
854 /* ignore this unmatched frame */
855 break;
856 case WORK_ACT_NONE:
857 break;
858 case WORK_ACT_DONE:
859 list_del_rcu(&wk->list);
860 break;
861 default:
862 WARN(1, "unexpected: %d", rma);
863 }
864
865 mutex_unlock(&local->mtx);
866
867 if (rma != WORK_ACT_DONE)
868 goto out;
869
870 switch (wk->done(wk, skb)) {
871 case WORK_DONE_DESTROY:
872 free_work(wk);
873 break;
874 case WORK_DONE_REQUEUE:
875 synchronize_rcu();
876 wk->started = false; /* restart */
877 mutex_lock(&local->mtx);
878 list_add_tail(&wk->list, &local->work_list);
879 mutex_unlock(&local->mtx);
880 }
881
882 out:
883 kfree_skb(skb);
884 }
885
886 static bool ieee80211_work_ct_coexists(enum nl80211_channel_type wk_ct,
887 enum nl80211_channel_type oper_ct)
888 {
889 switch (wk_ct) {
890 case NL80211_CHAN_NO_HT:
891 return true;
892 case NL80211_CHAN_HT20:
893 if (oper_ct != NL80211_CHAN_NO_HT)
894 return true;
895 return false;
896 case NL80211_CHAN_HT40MINUS:
897 case NL80211_CHAN_HT40PLUS:
898 return (wk_ct == oper_ct);
899 }
900 WARN_ON(1); /* shouldn't get here */
901 return false;
902 }
903
904 static enum nl80211_channel_type
905 ieee80211_calc_ct(enum nl80211_channel_type wk_ct,
906 enum nl80211_channel_type oper_ct)
907 {
908 switch (wk_ct) {
909 case NL80211_CHAN_NO_HT:
910 return oper_ct;
911 case NL80211_CHAN_HT20:
912 if (oper_ct != NL80211_CHAN_NO_HT)
913 return oper_ct;
914 return wk_ct;
915 case NL80211_CHAN_HT40MINUS:
916 case NL80211_CHAN_HT40PLUS:
917 return wk_ct;
918 }
919 WARN_ON(1); /* shouldn't get here */
920 return wk_ct;
921 }
922
923
924 static void ieee80211_work_timer(unsigned long data)
925 {
926 struct ieee80211_local *local = (void *) data;
927
928 if (local->quiescing)
929 return;
930
931 ieee80211_queue_work(&local->hw, &local->work_work);
932 }
933
934 static void ieee80211_work_work(struct work_struct *work)
935 {
936 struct ieee80211_local *local =
937 container_of(work, struct ieee80211_local, work_work);
938 struct sk_buff *skb;
939 struct ieee80211_work *wk, *tmp;
940 LIST_HEAD(free_work);
941 enum work_action rma;
942 bool remain_off_channel = false;
943
944 if (local->scanning)
945 return;
946
947 /*
948 * ieee80211_queue_work() should have picked up most cases,
949 * here we'll pick the rest.
950 */
951 if (WARN(local->suspended, "work scheduled while going to suspend\n"))
952 return;
953
954 /* first process frames to avoid timing out while a frame is pending */
955 while ((skb = skb_dequeue(&local->work_skb_queue)))
956 ieee80211_work_rx_queued_mgmt(local, skb);
957
958 mutex_lock(&local->mtx);
959
960 ieee80211_recalc_idle(local);
961
962 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
963 bool started = wk->started;
964
965 /* mark work as started if it's on the current off-channel */
966 if (!started && local->tmp_channel &&
967 wk->chan == local->tmp_channel &&
968 wk->chan_type == local->tmp_channel_type) {
969 started = true;
970 wk->timeout = jiffies;
971 }
972
973 if (!started && !local->tmp_channel) {
974 bool on_oper_chan;
975 bool tmp_chan_changed = false;
976 bool on_oper_chan2;
977 enum nl80211_channel_type wk_ct;
978 on_oper_chan = ieee80211_cfg_on_oper_channel(local);
979
980 /* Work with existing channel type if possible. */
981 wk_ct = wk->chan_type;
982 if (wk->chan == local->hw.conf.channel)
983 wk_ct = ieee80211_calc_ct(wk->chan_type,
984 local->hw.conf.channel_type);
985
986 if (local->tmp_channel)
987 if ((local->tmp_channel != wk->chan) ||
988 (local->tmp_channel_type != wk_ct))
989 tmp_chan_changed = true;
990
991 local->tmp_channel = wk->chan;
992 local->tmp_channel_type = wk_ct;
993 /*
994 * Leave the station vifs in awake mode if they
995 * happen to be on the same channel as
996 * the requested channel.
997 */
998 on_oper_chan2 = ieee80211_cfg_on_oper_channel(local);
999 if (on_oper_chan != on_oper_chan2) {
1000 if (on_oper_chan2) {
1001 /* going off oper channel, PS too */
1002 ieee80211_offchannel_stop_vifs(local,
1003 true);
1004 ieee80211_hw_config(local, 0);
1005 } else {
1006 /* going on channel, but leave PS
1007 * off-channel. */
1008 ieee80211_hw_config(local, 0);
1009 ieee80211_offchannel_return(local,
1010 true,
1011 false);
1012 }
1013 } else if (tmp_chan_changed)
1014 /* Still off-channel, but on some other
1015 * channel, so update hardware.
1016 * PS should already be off-channel.
1017 */
1018 ieee80211_hw_config(local, 0);
1019
1020 started = true;
1021 wk->timeout = jiffies;
1022 }
1023
1024 /* don't try to work with items that aren't started */
1025 if (!started)
1026 continue;
1027
1028 if (time_is_after_jiffies(wk->timeout)) {
1029 /*
1030 * This work item isn't supposed to be worked on
1031 * right now, but take care to adjust the timer
1032 * properly.
1033 */
1034 run_again(local, wk->timeout);
1035 continue;
1036 }
1037
1038 switch (wk->type) {
1039 default:
1040 WARN_ON(1);
1041 /* nothing */
1042 rma = WORK_ACT_NONE;
1043 break;
1044 case IEEE80211_WORK_ABORT:
1045 rma = WORK_ACT_TIMEOUT;
1046 break;
1047 case IEEE80211_WORK_DIRECT_PROBE:
1048 rma = ieee80211_direct_probe(wk);
1049 break;
1050 case IEEE80211_WORK_AUTH:
1051 rma = ieee80211_authenticate(wk);
1052 break;
1053 case IEEE80211_WORK_ASSOC:
1054 rma = ieee80211_associate(wk);
1055 break;
1056 case IEEE80211_WORK_REMAIN_ON_CHANNEL:
1057 rma = ieee80211_remain_on_channel_timeout(wk);
1058 break;
1059 case IEEE80211_WORK_OFFCHANNEL_TX:
1060 rma = ieee80211_offchannel_tx(wk);
1061 break;
1062 case IEEE80211_WORK_ASSOC_BEACON_WAIT:
1063 rma = ieee80211_assoc_beacon_wait(wk);
1064 break;
1065 }
1066
1067 wk->started = started;
1068
1069 switch (rma) {
1070 case WORK_ACT_NONE:
1071 /* might have changed the timeout */
1072 run_again(local, wk->timeout);
1073 break;
1074 case WORK_ACT_TIMEOUT:
1075 list_del_rcu(&wk->list);
1076 synchronize_rcu();
1077 list_add(&wk->list, &free_work);
1078 break;
1079 default:
1080 WARN(1, "unexpected: %d", rma);
1081 }
1082 }
1083
1084 list_for_each_entry(wk, &local->work_list, list) {
1085 if (!wk->started)
1086 continue;
1087 if (wk->chan != local->tmp_channel)
1088 continue;
1089 if (ieee80211_work_ct_coexists(wk->chan_type,
1090 local->tmp_channel_type))
1091 continue;
1092 remain_off_channel = true;
1093 }
1094
1095 if (!remain_off_channel && local->tmp_channel) {
1096 bool on_oper_chan = ieee80211_cfg_on_oper_channel(local);
1097 local->tmp_channel = NULL;
1098 /* If tmp_channel wasn't operating channel, then
1099 * we need to go back on-channel.
1100 * NOTE: If we can ever be here while scannning,
1101 * or if the hw_config() channel config logic changes,
1102 * then we may need to do a more thorough check to see if
1103 * we still need to do a hardware config. Currently,
1104 * we cannot be here while scanning, however.
1105 */
1106 if (ieee80211_cfg_on_oper_channel(local) && !on_oper_chan)
1107 ieee80211_hw_config(local, 0);
1108
1109 /* At the least, we need to disable offchannel_ps,
1110 * so just go ahead and run the entire offchannel
1111 * return logic here. We *could* skip enabling
1112 * beaconing if we were already on-oper-channel
1113 * as a future optimization.
1114 */
1115 ieee80211_offchannel_return(local, true, true);
1116
1117 /* give connection some time to breathe */
1118 run_again(local, jiffies + HZ/2);
1119 }
1120
1121 if (list_empty(&local->work_list) && local->scan_req &&
1122 !local->scanning)
1123 ieee80211_queue_delayed_work(&local->hw,
1124 &local->scan_work,
1125 round_jiffies_relative(0));
1126
1127 ieee80211_recalc_idle(local);
1128
1129 mutex_unlock(&local->mtx);
1130
1131 list_for_each_entry_safe(wk, tmp, &free_work, list) {
1132 wk->done(wk, NULL);
1133 list_del(&wk->list);
1134 kfree(wk);
1135 }
1136 }
1137
1138 void ieee80211_add_work(struct ieee80211_work *wk)
1139 {
1140 struct ieee80211_local *local;
1141
1142 if (WARN_ON(!wk->chan))
1143 return;
1144
1145 if (WARN_ON(!wk->sdata))
1146 return;
1147
1148 if (WARN_ON(!wk->done))
1149 return;
1150
1151 if (WARN_ON(!ieee80211_sdata_running(wk->sdata)))
1152 return;
1153
1154 wk->started = false;
1155
1156 local = wk->sdata->local;
1157 mutex_lock(&local->mtx);
1158 list_add_tail(&wk->list, &local->work_list);
1159 mutex_unlock(&local->mtx);
1160
1161 ieee80211_queue_work(&local->hw, &local->work_work);
1162 }
1163
1164 void ieee80211_work_init(struct ieee80211_local *local)
1165 {
1166 INIT_LIST_HEAD(&local->work_list);
1167 setup_timer(&local->work_timer, ieee80211_work_timer,
1168 (unsigned long)local);
1169 INIT_WORK(&local->work_work, ieee80211_work_work);
1170 skb_queue_head_init(&local->work_skb_queue);
1171 }
1172
1173 void ieee80211_work_purge(struct ieee80211_sub_if_data *sdata)
1174 {
1175 struct ieee80211_local *local = sdata->local;
1176 struct ieee80211_work *wk;
1177 bool cleanup = false;
1178
1179 mutex_lock(&local->mtx);
1180 list_for_each_entry(wk, &local->work_list, list) {
1181 if (wk->sdata != sdata)
1182 continue;
1183 cleanup = true;
1184 wk->type = IEEE80211_WORK_ABORT;
1185 wk->started = true;
1186 wk->timeout = jiffies;
1187 }
1188 mutex_unlock(&local->mtx);
1189
1190 /* run cleanups etc. */
1191 if (cleanup)
1192 ieee80211_work_work(&local->work_work);
1193
1194 mutex_lock(&local->mtx);
1195 list_for_each_entry(wk, &local->work_list, list) {
1196 if (wk->sdata != sdata)
1197 continue;
1198 WARN_ON(1);
1199 break;
1200 }
1201 mutex_unlock(&local->mtx);
1202 }
1203
1204 ieee80211_rx_result ieee80211_work_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1205 struct sk_buff *skb)
1206 {
1207 struct ieee80211_local *local = sdata->local;
1208 struct ieee80211_mgmt *mgmt;
1209 struct ieee80211_work *wk;
1210 u16 fc;
1211
1212 if (skb->len < 24)
1213 return RX_DROP_MONITOR;
1214
1215 mgmt = (struct ieee80211_mgmt *) skb->data;
1216 fc = le16_to_cpu(mgmt->frame_control);
1217
1218 list_for_each_entry_rcu(wk, &local->work_list, list) {
1219 if (sdata != wk->sdata)
1220 continue;
1221 if (compare_ether_addr(wk->filter_ta, mgmt->sa))
1222 continue;
1223 if (compare_ether_addr(wk->filter_ta, mgmt->bssid))
1224 continue;
1225
1226 switch (fc & IEEE80211_FCTL_STYPE) {
1227 case IEEE80211_STYPE_AUTH:
1228 case IEEE80211_STYPE_PROBE_RESP:
1229 case IEEE80211_STYPE_ASSOC_RESP:
1230 case IEEE80211_STYPE_REASSOC_RESP:
1231 case IEEE80211_STYPE_BEACON:
1232 skb_queue_tail(&local->work_skb_queue, skb);
1233 ieee80211_queue_work(&local->hw, &local->work_work);
1234 return RX_QUEUED;
1235 }
1236 }
1237
1238 return RX_CONTINUE;
1239 }
1240
1241 static enum work_done_result ieee80211_remain_done(struct ieee80211_work *wk,
1242 struct sk_buff *skb)
1243 {
1244 /*
1245 * We are done serving the remain-on-channel command.
1246 */
1247 cfg80211_remain_on_channel_expired(wk->sdata->dev, (unsigned long) wk,
1248 wk->chan, wk->chan_type,
1249 GFP_KERNEL);
1250
1251 return WORK_DONE_DESTROY;
1252 }
1253
1254 int ieee80211_wk_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1255 struct ieee80211_channel *chan,
1256 enum nl80211_channel_type channel_type,
1257 unsigned int duration, u64 *cookie)
1258 {
1259 struct ieee80211_work *wk;
1260
1261 wk = kzalloc(sizeof(*wk), GFP_KERNEL);
1262 if (!wk)
1263 return -ENOMEM;
1264
1265 wk->type = IEEE80211_WORK_REMAIN_ON_CHANNEL;
1266 wk->chan = chan;
1267 wk->chan_type = channel_type;
1268 wk->sdata = sdata;
1269 wk->done = ieee80211_remain_done;
1270
1271 wk->remain.duration = duration;
1272
1273 *cookie = (unsigned long) wk;
1274
1275 ieee80211_add_work(wk);
1276
1277 return 0;
1278 }
1279
1280 int ieee80211_wk_cancel_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1281 u64 cookie)
1282 {
1283 struct ieee80211_local *local = sdata->local;
1284 struct ieee80211_work *wk, *tmp;
1285 bool found = false;
1286
1287 mutex_lock(&local->mtx);
1288 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
1289 if ((unsigned long) wk == cookie) {
1290 wk->timeout = jiffies;
1291 found = true;
1292 break;
1293 }
1294 }
1295 mutex_unlock(&local->mtx);
1296
1297 if (!found)
1298 return -ENOENT;
1299
1300 ieee80211_queue_work(&local->hw, &local->work_work);
1301
1302 return 0;
1303 }
Linux kernel - Deliverables
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