Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6.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 <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
34 enum work_action {
35         WORK_ACT_NONE,
36         WORK_ACT_TIMEOUT,
37         WORK_ACT_DONE,
38 };
39
40
41 /* utils */
42 static 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  */
57 static 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
67 static 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
75 void free_work(struct ieee80211_work *wk)
76 {
77         call_rcu(&wk->rcu_head, work_free_rcu);
78 }
79
80 static 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
103 static 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
199 static 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, qos_info;
206         const u8 *ies;
207         size_t offset = 0, noffset;
208         int i, len, count, rates_len, supp_rates_len;
209         u16 capab;
210         struct ieee80211_supported_band *sband;
211         u32 rates = 0;
212
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);
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
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
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 */
327                 *pos++ = wk->chan->max_power; /* max tx power */
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
341         /* if present, add any custom IEs that go before HT */
342         if (wk->ie_len && wk->ie) {
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;
361         }
362
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
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
377         if (wk->assoc.wmm_used && local->hw.queues >= 4) {
378                 if (wk->assoc.uapsd_used) {
379                         qos_info = local->uapsd_queues;
380                         qos_info |= (local->uapsd_max_sp_len <<
381                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
382                 } else {
383                         qos_info = 0;
384                 }
385
386                 pos = skb_put(skb, 9);
387                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
388                 *pos++ = 7; /* len */
389                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
390                 *pos++ = 0x50;
391                 *pos++ = 0xf2;
392                 *pos++ = 2; /* WME */
393                 *pos++ = 0; /* WME info */
394                 *pos++ = 1; /* WME ver */
395                 *pos++ = qos_info;
396         }
397
398         /* add any remaining custom (i.e. vendor specific here) IEs */
399         if (wk->ie_len && wk->ie) {
400                 noffset = wk->ie_len;
401                 pos = skb_put(skb, noffset - offset);
402                 memcpy(pos, wk->ie + offset, noffset - offset);
403         }
404
405         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
406         ieee80211_tx_skb(sdata, skb);
407 }
408
409 static void ieee80211_remove_auth_bss(struct ieee80211_local *local,
410                                       struct ieee80211_work *wk)
411 {
412         struct cfg80211_bss *cbss;
413         u16 capa_val = WLAN_CAPABILITY_ESS;
414
415         if (wk->probe_auth.privacy)
416                 capa_val |= WLAN_CAPABILITY_PRIVACY;
417
418         cbss = cfg80211_get_bss(local->hw.wiphy, wk->chan, wk->filter_ta,
419                                 wk->probe_auth.ssid, wk->probe_auth.ssid_len,
420                                 WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
421                                 capa_val);
422         if (!cbss)
423                 return;
424
425         cfg80211_unlink_bss(local->hw.wiphy, cbss);
426         cfg80211_put_bss(cbss);
427 }
428
429 static enum work_action __must_check
430 ieee80211_direct_probe(struct ieee80211_work *wk)
431 {
432         struct ieee80211_sub_if_data *sdata = wk->sdata;
433         struct ieee80211_local *local = sdata->local;
434
435         wk->probe_auth.tries++;
436         if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
437                 printk(KERN_DEBUG "%s: direct probe to %pM timed out\n",
438                        sdata->name, wk->filter_ta);
439
440                 /*
441                  * Most likely AP is not in the range so remove the
442                  * bss struct for that AP.
443                  */
444                 ieee80211_remove_auth_bss(local, wk);
445
446                 return WORK_ACT_TIMEOUT;
447         }
448
449         printk(KERN_DEBUG "%s: direct probe to %pM (try %d)\n",
450                         sdata->name, wk->filter_ta, wk->probe_auth.tries);
451
452         /*
453          * Direct probe is sent to broadcast address as some APs
454          * will not answer to direct packet in unassociated state.
455          */
456         ieee80211_send_probe_req(sdata, NULL, wk->probe_auth.ssid,
457                                  wk->probe_auth.ssid_len, NULL, 0);
458
459         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
460         run_again(local, wk->timeout);
461
462         return WORK_ACT_NONE;
463 }
464
465
466 static enum work_action __must_check
467 ieee80211_authenticate(struct ieee80211_work *wk)
468 {
469         struct ieee80211_sub_if_data *sdata = wk->sdata;
470         struct ieee80211_local *local = sdata->local;
471
472         wk->probe_auth.tries++;
473         if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
474                 printk(KERN_DEBUG "%s: authentication with %pM"
475                        " timed out\n", sdata->name, wk->filter_ta);
476
477                 /*
478                  * Most likely AP is not in the range so remove the
479                  * bss struct for that AP.
480                  */
481                 ieee80211_remove_auth_bss(local, wk);
482
483                 return WORK_ACT_TIMEOUT;
484         }
485
486         printk(KERN_DEBUG "%s: authenticate with %pM (try %d)\n",
487                sdata->name, wk->filter_ta, wk->probe_auth.tries);
488
489         ieee80211_send_auth(sdata, 1, wk->probe_auth.algorithm, wk->ie,
490                             wk->ie_len, wk->filter_ta, NULL, 0, 0);
491         wk->probe_auth.transaction = 2;
492
493         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
494         run_again(local, wk->timeout);
495
496         return WORK_ACT_NONE;
497 }
498
499 static enum work_action __must_check
500 ieee80211_associate(struct ieee80211_work *wk)
501 {
502         struct ieee80211_sub_if_data *sdata = wk->sdata;
503         struct ieee80211_local *local = sdata->local;
504
505         wk->assoc.tries++;
506         if (wk->assoc.tries > IEEE80211_ASSOC_MAX_TRIES) {
507                 printk(KERN_DEBUG "%s: association with %pM"
508                        " timed out\n",
509                        sdata->name, wk->filter_ta);
510
511                 /*
512                  * Most likely AP is not in the range so remove the
513                  * bss struct for that AP.
514                  */
515                 if (wk->assoc.bss)
516                         cfg80211_unlink_bss(local->hw.wiphy, wk->assoc.bss);
517
518                 return WORK_ACT_TIMEOUT;
519         }
520
521         printk(KERN_DEBUG "%s: associate with %pM (try %d)\n",
522                sdata->name, wk->filter_ta, wk->assoc.tries);
523         ieee80211_send_assoc(sdata, wk);
524
525         wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
526         run_again(local, wk->timeout);
527
528         return WORK_ACT_NONE;
529 }
530
531 static enum work_action __must_check
532 ieee80211_remain_on_channel_timeout(struct ieee80211_work *wk)
533 {
534         /*
535          * First time we run, do nothing -- the generic code will
536          * have switched to the right channel etc.
537          */
538         if (!wk->started) {
539                 wk->timeout = jiffies + msecs_to_jiffies(wk->remain.duration);
540
541                 cfg80211_ready_on_channel(wk->sdata->dev, (unsigned long) wk,
542                                           wk->chan, wk->chan_type,
543                                           wk->remain.duration, GFP_KERNEL);
544
545                 return WORK_ACT_NONE;
546         }
547
548         return WORK_ACT_TIMEOUT;
549 }
550
551 static void ieee80211_auth_challenge(struct ieee80211_work *wk,
552                                      struct ieee80211_mgmt *mgmt,
553                                      size_t len)
554 {
555         struct ieee80211_sub_if_data *sdata = wk->sdata;
556         u8 *pos;
557         struct ieee802_11_elems elems;
558
559         pos = mgmt->u.auth.variable;
560         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
561         if (!elems.challenge)
562                 return;
563         ieee80211_send_auth(sdata, 3, wk->probe_auth.algorithm,
564                             elems.challenge - 2, elems.challenge_len + 2,
565                             wk->filter_ta, wk->probe_auth.key,
566                             wk->probe_auth.key_len, wk->probe_auth.key_idx);
567         wk->probe_auth.transaction = 4;
568 }
569
570 static enum work_action __must_check
571 ieee80211_rx_mgmt_auth(struct ieee80211_work *wk,
572                        struct ieee80211_mgmt *mgmt, size_t len)
573 {
574         u16 auth_alg, auth_transaction, status_code;
575
576         if (wk->type != IEEE80211_WORK_AUTH)
577                 return WORK_ACT_NONE;
578
579         if (len < 24 + 6)
580                 return WORK_ACT_NONE;
581
582         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
583         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
584         status_code = le16_to_cpu(mgmt->u.auth.status_code);
585
586         if (auth_alg != wk->probe_auth.algorithm ||
587             auth_transaction != wk->probe_auth.transaction)
588                 return WORK_ACT_NONE;
589
590         if (status_code != WLAN_STATUS_SUCCESS) {
591                 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
592                        wk->sdata->name, mgmt->sa, status_code);
593                 return WORK_ACT_DONE;
594         }
595
596         switch (wk->probe_auth.algorithm) {
597         case WLAN_AUTH_OPEN:
598         case WLAN_AUTH_LEAP:
599         case WLAN_AUTH_FT:
600                 break;
601         case WLAN_AUTH_SHARED_KEY:
602                 if (wk->probe_auth.transaction != 4) {
603                         ieee80211_auth_challenge(wk, mgmt, len);
604                         /* need another frame */
605                         return WORK_ACT_NONE;
606                 }
607                 break;
608         default:
609                 WARN_ON(1);
610                 return WORK_ACT_NONE;
611         }
612
613         printk(KERN_DEBUG "%s: authenticated\n", wk->sdata->name);
614         return WORK_ACT_DONE;
615 }
616
617 static enum work_action __must_check
618 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_work *wk,
619                              struct ieee80211_mgmt *mgmt, size_t len,
620                              bool reassoc)
621 {
622         struct ieee80211_sub_if_data *sdata = wk->sdata;
623         struct ieee80211_local *local = sdata->local;
624         u16 capab_info, status_code, aid;
625         struct ieee802_11_elems elems;
626         u8 *pos;
627
628         /*
629          * AssocResp and ReassocResp have identical structure, so process both
630          * of them in this function.
631          */
632
633         if (len < 24 + 6)
634                 return WORK_ACT_NONE;
635
636         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
637         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
638         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
639
640         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
641                "status=%d aid=%d)\n",
642                sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
643                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
644
645         pos = mgmt->u.assoc_resp.variable;
646         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
647
648         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
649             elems.timeout_int && elems.timeout_int_len == 5 &&
650             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
651                 u32 tu, ms;
652                 tu = get_unaligned_le32(elems.timeout_int + 1);
653                 ms = tu * 1024 / 1000;
654                 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
655                        "comeback duration %u TU (%u ms)\n",
656                        sdata->name, mgmt->sa, tu, ms);
657                 wk->timeout = jiffies + msecs_to_jiffies(ms);
658                 if (ms > IEEE80211_ASSOC_TIMEOUT)
659                         run_again(local, wk->timeout);
660                 return WORK_ACT_NONE;
661         }
662
663         if (status_code != WLAN_STATUS_SUCCESS)
664                 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
665                        sdata->name, mgmt->sa, status_code);
666         else
667                 printk(KERN_DEBUG "%s: associated\n", sdata->name);
668
669         return WORK_ACT_DONE;
670 }
671
672 static enum work_action __must_check
673 ieee80211_rx_mgmt_probe_resp(struct ieee80211_work *wk,
674                              struct ieee80211_mgmt *mgmt, size_t len,
675                              struct ieee80211_rx_status *rx_status)
676 {
677         struct ieee80211_sub_if_data *sdata = wk->sdata;
678         struct ieee80211_local *local = sdata->local;
679         size_t baselen;
680
681         ASSERT_WORK_MTX(local);
682
683         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
684         if (baselen > len)
685                 return WORK_ACT_NONE;
686
687         printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
688         return WORK_ACT_DONE;
689 }
690
691 static void ieee80211_work_rx_queued_mgmt(struct ieee80211_local *local,
692                                           struct sk_buff *skb)
693 {
694         struct ieee80211_rx_status *rx_status;
695         struct ieee80211_mgmt *mgmt;
696         struct ieee80211_work *wk;
697         enum work_action rma = WORK_ACT_NONE;
698         u16 fc;
699
700         rx_status = (struct ieee80211_rx_status *) skb->cb;
701         mgmt = (struct ieee80211_mgmt *) skb->data;
702         fc = le16_to_cpu(mgmt->frame_control);
703
704         mutex_lock(&local->work_mtx);
705
706         list_for_each_entry(wk, &local->work_list, list) {
707                 const u8 *bssid = NULL;
708
709                 switch (wk->type) {
710                 case IEEE80211_WORK_DIRECT_PROBE:
711                 case IEEE80211_WORK_AUTH:
712                 case IEEE80211_WORK_ASSOC:
713                         bssid = wk->filter_ta;
714                         break;
715                 default:
716                         continue;
717                 }
718
719                 /*
720                  * Before queuing, we already verified mgmt->sa,
721                  * so this is needed just for matching.
722                  */
723                 if (compare_ether_addr(bssid, mgmt->bssid))
724                         continue;
725
726                 switch (fc & IEEE80211_FCTL_STYPE) {
727                 case IEEE80211_STYPE_PROBE_RESP:
728                         rma = ieee80211_rx_mgmt_probe_resp(wk, mgmt, skb->len,
729                                                            rx_status);
730                         break;
731                 case IEEE80211_STYPE_AUTH:
732                         rma = ieee80211_rx_mgmt_auth(wk, mgmt, skb->len);
733                         break;
734                 case IEEE80211_STYPE_ASSOC_RESP:
735                         rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
736                                                            skb->len, false);
737                         break;
738                 case IEEE80211_STYPE_REASSOC_RESP:
739                         rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
740                                                            skb->len, true);
741                         break;
742                 default:
743                         WARN_ON(1);
744                 }
745                 /*
746                  * We've processed this frame for that work, so it can't
747                  * belong to another work struct.
748                  * NB: this is also required for correctness for 'rma'!
749                  */
750                 break;
751         }
752
753         switch (rma) {
754         case WORK_ACT_NONE:
755                 break;
756         case WORK_ACT_DONE:
757                 list_del_rcu(&wk->list);
758                 break;
759         default:
760                 WARN(1, "unexpected: %d", rma);
761         }
762
763         mutex_unlock(&local->work_mtx);
764
765         if (rma != WORK_ACT_DONE)
766                 goto out;
767
768         switch (wk->done(wk, skb)) {
769         case WORK_DONE_DESTROY:
770                 free_work(wk);
771                 break;
772         case WORK_DONE_REQUEUE:
773                 synchronize_rcu();
774                 wk->started = false; /* restart */
775                 mutex_lock(&local->work_mtx);
776                 list_add_tail(&wk->list, &local->work_list);
777                 mutex_unlock(&local->work_mtx);
778         }
779
780  out:
781         kfree_skb(skb);
782 }
783
784 static void ieee80211_work_timer(unsigned long data)
785 {
786         struct ieee80211_local *local = (void *) data;
787
788         if (local->quiescing)
789                 return;
790
791         ieee80211_queue_work(&local->hw, &local->work_work);
792 }
793
794 static void ieee80211_work_work(struct work_struct *work)
795 {
796         struct ieee80211_local *local =
797                 container_of(work, struct ieee80211_local, work_work);
798         struct sk_buff *skb;
799         struct ieee80211_work *wk, *tmp;
800         LIST_HEAD(free_work);
801         enum work_action rma;
802         bool remain_off_channel = false;
803
804         if (local->scanning)
805                 return;
806
807         /*
808          * ieee80211_queue_work() should have picked up most cases,
809          * here we'll pick the the rest.
810          */
811         if (WARN(local->suspended, "work scheduled while going to suspend\n"))
812                 return;
813
814         /* first process frames to avoid timing out while a frame is pending */
815         while ((skb = skb_dequeue(&local->work_skb_queue)))
816                 ieee80211_work_rx_queued_mgmt(local, skb);
817
818         ieee80211_recalc_idle(local);
819
820         mutex_lock(&local->work_mtx);
821
822         list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
823                 bool started = wk->started;
824
825                 /* mark work as started if it's on the current off-channel */
826                 if (!started && local->tmp_channel &&
827                     wk->chan == local->tmp_channel &&
828                     wk->chan_type == local->tmp_channel_type) {
829                         started = true;
830                         wk->timeout = jiffies;
831                 }
832
833                 if (!started && !local->tmp_channel) {
834                         /*
835                          * TODO: could optimize this by leaving the
836                          *       station vifs in awake mode if they
837                          *       happen to be on the same channel as
838                          *       the requested channel
839                          */
840                         ieee80211_offchannel_stop_beaconing(local);
841                         ieee80211_offchannel_stop_station(local);
842
843                         local->tmp_channel = wk->chan;
844                         local->tmp_channel_type = wk->chan_type;
845                         ieee80211_hw_config(local, 0);
846                         started = true;
847                         wk->timeout = jiffies;
848                 }
849
850                 /* don't try to work with items that aren't started */
851                 if (!started)
852                         continue;
853
854                 if (time_is_after_jiffies(wk->timeout)) {
855                         /*
856                          * This work item isn't supposed to be worked on
857                          * right now, but take care to adjust the timer
858                          * properly.
859                          */
860                         run_again(local, wk->timeout);
861                         continue;
862                 }
863
864                 switch (wk->type) {
865                 default:
866                         WARN_ON(1);
867                         /* nothing */
868                         rma = WORK_ACT_NONE;
869                         break;
870                 case IEEE80211_WORK_ABORT:
871                         rma = WORK_ACT_TIMEOUT;
872                         break;
873                 case IEEE80211_WORK_DIRECT_PROBE:
874                         rma = ieee80211_direct_probe(wk);
875                         break;
876                 case IEEE80211_WORK_AUTH:
877                         rma = ieee80211_authenticate(wk);
878                         break;
879                 case IEEE80211_WORK_ASSOC:
880                         rma = ieee80211_associate(wk);
881                         break;
882                 case IEEE80211_WORK_REMAIN_ON_CHANNEL:
883                         rma = ieee80211_remain_on_channel_timeout(wk);
884                         break;
885                 }
886
887                 wk->started = started;
888
889                 switch (rma) {
890                 case WORK_ACT_NONE:
891                         /* might have changed the timeout */
892                         run_again(local, wk->timeout);
893                         break;
894                 case WORK_ACT_TIMEOUT:
895                         list_del_rcu(&wk->list);
896                         synchronize_rcu();
897                         list_add(&wk->list, &free_work);
898                         break;
899                 default:
900                         WARN(1, "unexpected: %d", rma);
901                 }
902         }
903
904         list_for_each_entry(wk, &local->work_list, list) {
905                 if (!wk->started)
906                         continue;
907                 if (wk->chan != local->tmp_channel)
908                         continue;
909                 if (wk->chan_type != local->tmp_channel_type)
910                         continue;
911                 remain_off_channel = true;
912         }
913
914         if (!remain_off_channel && local->tmp_channel) {
915                 local->tmp_channel = NULL;
916                 ieee80211_hw_config(local, 0);
917                 ieee80211_offchannel_return(local, true);
918                 /* give connection some time to breathe */
919                 run_again(local, jiffies + HZ/2);
920         }
921
922         if (list_empty(&local->work_list) && local->scan_req)
923                 ieee80211_queue_delayed_work(&local->hw,
924                                              &local->scan_work,
925                                              round_jiffies_relative(0));
926
927         mutex_unlock(&local->work_mtx);
928
929         ieee80211_recalc_idle(local);
930
931         list_for_each_entry_safe(wk, tmp, &free_work, list) {
932                 wk->done(wk, NULL);
933                 list_del(&wk->list);
934                 kfree(wk);
935         }
936 }
937
938 void ieee80211_add_work(struct ieee80211_work *wk)
939 {
940         struct ieee80211_local *local;
941
942         if (WARN_ON(!wk->chan))
943                 return;
944
945         if (WARN_ON(!wk->sdata))
946                 return;
947
948         if (WARN_ON(!wk->done))
949                 return;
950
951         if (WARN_ON(!ieee80211_sdata_running(wk->sdata)))
952                 return;
953
954         wk->started = false;
955
956         local = wk->sdata->local;
957         mutex_lock(&local->work_mtx);
958         list_add_tail(&wk->list, &local->work_list);
959         mutex_unlock(&local->work_mtx);
960
961         ieee80211_queue_work(&local->hw, &local->work_work);
962 }
963
964 void ieee80211_work_init(struct ieee80211_local *local)
965 {
966         mutex_init(&local->work_mtx);
967         INIT_LIST_HEAD(&local->work_list);
968         setup_timer(&local->work_timer, ieee80211_work_timer,
969                     (unsigned long)local);
970         INIT_WORK(&local->work_work, ieee80211_work_work);
971         skb_queue_head_init(&local->work_skb_queue);
972 }
973
974 void ieee80211_work_purge(struct ieee80211_sub_if_data *sdata)
975 {
976         struct ieee80211_local *local = sdata->local;
977         struct ieee80211_work *wk;
978
979         mutex_lock(&local->work_mtx);
980         list_for_each_entry(wk, &local->work_list, list) {
981                 if (wk->sdata != sdata)
982                         continue;
983                 wk->type = IEEE80211_WORK_ABORT;
984                 wk->started = true;
985                 wk->timeout = jiffies;
986         }
987         mutex_unlock(&local->work_mtx);
988
989         /* run cleanups etc. */
990         ieee80211_work_work(&local->work_work);
991
992         mutex_lock(&local->work_mtx);
993         list_for_each_entry(wk, &local->work_list, list) {
994                 if (wk->sdata != sdata)
995                         continue;
996                 WARN_ON(1);
997                 break;
998         }
999         mutex_unlock(&local->work_mtx);
1000 }
1001
1002 ieee80211_rx_result ieee80211_work_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1003                                            struct sk_buff *skb)
1004 {
1005         struct ieee80211_local *local = sdata->local;
1006         struct ieee80211_mgmt *mgmt;
1007         struct ieee80211_work *wk;
1008         u16 fc;
1009
1010         if (skb->len < 24)
1011                 return RX_DROP_MONITOR;
1012
1013         mgmt = (struct ieee80211_mgmt *) skb->data;
1014         fc = le16_to_cpu(mgmt->frame_control);
1015
1016         list_for_each_entry_rcu(wk, &local->work_list, list) {
1017                 if (sdata != wk->sdata)
1018                         continue;
1019                 if (compare_ether_addr(wk->filter_ta, mgmt->sa))
1020                         continue;
1021                 if (compare_ether_addr(wk->filter_ta, mgmt->bssid))
1022                         continue;
1023
1024                 switch (fc & IEEE80211_FCTL_STYPE) {
1025                 case IEEE80211_STYPE_AUTH:
1026                 case IEEE80211_STYPE_PROBE_RESP:
1027                 case IEEE80211_STYPE_ASSOC_RESP:
1028                 case IEEE80211_STYPE_REASSOC_RESP:
1029                         skb_queue_tail(&local->work_skb_queue, skb);
1030                         ieee80211_queue_work(&local->hw, &local->work_work);
1031                         return RX_QUEUED;
1032                 }
1033         }
1034
1035         return RX_CONTINUE;
1036 }
1037
1038 static enum work_done_result ieee80211_remain_done(struct ieee80211_work *wk,
1039                                                    struct sk_buff *skb)
1040 {
1041         /*
1042          * We are done serving the remain-on-channel command.
1043          */
1044         cfg80211_remain_on_channel_expired(wk->sdata->dev, (unsigned long) wk,
1045                                            wk->chan, wk->chan_type,
1046                                            GFP_KERNEL);
1047
1048         return WORK_DONE_DESTROY;
1049 }
1050
1051 int ieee80211_wk_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1052                                    struct ieee80211_channel *chan,
1053                                    enum nl80211_channel_type channel_type,
1054                                    unsigned int duration, u64 *cookie)
1055 {
1056         struct ieee80211_work *wk;
1057
1058         wk = kzalloc(sizeof(*wk), GFP_KERNEL);
1059         if (!wk)
1060                 return -ENOMEM;
1061
1062         wk->type = IEEE80211_WORK_REMAIN_ON_CHANNEL;
1063         wk->chan = chan;
1064         wk->chan_type = channel_type;
1065         wk->sdata = sdata;
1066         wk->done = ieee80211_remain_done;
1067
1068         wk->remain.duration = duration;
1069
1070         *cookie = (unsigned long) wk;
1071
1072         ieee80211_add_work(wk);
1073
1074         return 0;
1075 }
1076
1077 int ieee80211_wk_cancel_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1078                                           u64 cookie)
1079 {
1080         struct ieee80211_local *local = sdata->local;
1081         struct ieee80211_work *wk, *tmp;
1082         bool found = false;
1083
1084         mutex_lock(&local->work_mtx);
1085         list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
1086                 if ((unsigned long) wk == cookie) {
1087                         wk->timeout = jiffies;
1088                         found = true;
1089                         break;
1090                 }
1091         }
1092         mutex_unlock(&local->work_mtx);
1093
1094         if (!found)
1095                 return -ENOENT;
1096
1097         ieee80211_queue_work(&local->hw, &local->work_work);
1098
1099         return 0;
1100 }