mac80211: split up and insert custom IEs correctly
[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;
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                 pos = skb_put(skb, 9);
379                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
380                 *pos++ = 7; /* len */
381                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
382                 *pos++ = 0x50;
383                 *pos++ = 0xf2;
384                 *pos++ = 2; /* WME */
385                 *pos++ = 0; /* WME info */
386                 *pos++ = 1; /* WME ver */
387                 *pos++ = 0;
388         }
389
390         /* add any remaining custom (i.e. vendor specific here) IEs */
391         if (wk->ie_len && wk->ie) {
392                 noffset = wk->ie_len;
393                 pos = skb_put(skb, noffset - offset);
394                 memcpy(pos, wk->ie + offset, noffset - offset);
395         }
396
397         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
398         ieee80211_tx_skb(sdata, skb);
399 }
400
401 static void ieee80211_remove_auth_bss(struct ieee80211_local *local,
402                                       struct ieee80211_work *wk)
403 {
404         struct cfg80211_bss *cbss;
405         u16 capa_val = WLAN_CAPABILITY_ESS;
406
407         if (wk->probe_auth.privacy)
408                 capa_val |= WLAN_CAPABILITY_PRIVACY;
409
410         cbss = cfg80211_get_bss(local->hw.wiphy, wk->chan, wk->filter_ta,
411                                 wk->probe_auth.ssid, wk->probe_auth.ssid_len,
412                                 WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
413                                 capa_val);
414         if (!cbss)
415                 return;
416
417         cfg80211_unlink_bss(local->hw.wiphy, cbss);
418         cfg80211_put_bss(cbss);
419 }
420
421 static enum work_action __must_check
422 ieee80211_direct_probe(struct ieee80211_work *wk)
423 {
424         struct ieee80211_sub_if_data *sdata = wk->sdata;
425         struct ieee80211_local *local = sdata->local;
426
427         wk->probe_auth.tries++;
428         if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
429                 printk(KERN_DEBUG "%s: direct probe to %pM timed out\n",
430                        sdata->name, wk->filter_ta);
431
432                 /*
433                  * Most likely AP is not in the range so remove the
434                  * bss struct for that AP.
435                  */
436                 ieee80211_remove_auth_bss(local, wk);
437
438                 /*
439                  * We might have a pending scan which had no chance to run yet
440                  * due to work needing to be done. Hence, queue the STAs work
441                  * again for that.
442                  */
443                 ieee80211_queue_work(&local->hw, &local->work_work);
444                 return WORK_ACT_TIMEOUT;
445         }
446
447         printk(KERN_DEBUG "%s: direct probe to %pM (try %d)\n",
448                         sdata->name, wk->filter_ta, wk->probe_auth.tries);
449
450         /*
451          * Direct probe is sent to broadcast address as some APs
452          * will not answer to direct packet in unassociated state.
453          */
454         ieee80211_send_probe_req(sdata, NULL, wk->probe_auth.ssid,
455                                  wk->probe_auth.ssid_len, NULL, 0);
456
457         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
458         run_again(local, wk->timeout);
459
460         return WORK_ACT_NONE;
461 }
462
463
464 static enum work_action __must_check
465 ieee80211_authenticate(struct ieee80211_work *wk)
466 {
467         struct ieee80211_sub_if_data *sdata = wk->sdata;
468         struct ieee80211_local *local = sdata->local;
469
470         wk->probe_auth.tries++;
471         if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
472                 printk(KERN_DEBUG "%s: authentication with %pM"
473                        " timed out\n", sdata->name, wk->filter_ta);
474
475                 /*
476                  * Most likely AP is not in the range so remove the
477                  * bss struct for that AP.
478                  */
479                 ieee80211_remove_auth_bss(local, wk);
480
481                 /*
482                  * We might have a pending scan which had no chance to run yet
483                  * due to work needing to be done. Hence, queue the STAs work
484                  * again for that.
485                  */
486                 ieee80211_queue_work(&local->hw, &local->work_work);
487                 return WORK_ACT_TIMEOUT;
488         }
489
490         printk(KERN_DEBUG "%s: authenticate with %pM (try %d)\n",
491                sdata->name, wk->filter_ta, wk->probe_auth.tries);
492
493         ieee80211_send_auth(sdata, 1, wk->probe_auth.algorithm, wk->ie,
494                             wk->ie_len, wk->filter_ta, NULL, 0, 0);
495         wk->probe_auth.transaction = 2;
496
497         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
498         run_again(local, wk->timeout);
499
500         return WORK_ACT_NONE;
501 }
502
503 static enum work_action __must_check
504 ieee80211_associate(struct ieee80211_work *wk)
505 {
506         struct ieee80211_sub_if_data *sdata = wk->sdata;
507         struct ieee80211_local *local = sdata->local;
508
509         wk->assoc.tries++;
510         if (wk->assoc.tries > IEEE80211_ASSOC_MAX_TRIES) {
511                 printk(KERN_DEBUG "%s: association with %pM"
512                        " timed out\n",
513                        sdata->name, wk->filter_ta);
514
515                 /*
516                  * Most likely AP is not in the range so remove the
517                  * bss struct for that AP.
518                  */
519                 if (wk->assoc.bss)
520                         cfg80211_unlink_bss(local->hw.wiphy,
521                                             &wk->assoc.bss->cbss);
522
523                 /*
524                  * We might have a pending scan which had no chance to run yet
525                  * due to work needing to be done. Hence, queue the STAs work
526                  * again for that.
527                  */
528                 ieee80211_queue_work(&local->hw, &local->work_work);
529                 return WORK_ACT_TIMEOUT;
530         }
531
532         printk(KERN_DEBUG "%s: associate with %pM (try %d)\n",
533                sdata->name, wk->filter_ta, wk->assoc.tries);
534         ieee80211_send_assoc(sdata, wk);
535
536         wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
537         run_again(local, wk->timeout);
538
539         return WORK_ACT_NONE;
540 }
541
542 static void ieee80211_auth_challenge(struct ieee80211_work *wk,
543                                      struct ieee80211_mgmt *mgmt,
544                                      size_t len)
545 {
546         struct ieee80211_sub_if_data *sdata = wk->sdata;
547         u8 *pos;
548         struct ieee802_11_elems elems;
549
550         pos = mgmt->u.auth.variable;
551         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
552         if (!elems.challenge)
553                 return;
554         ieee80211_send_auth(sdata, 3, wk->probe_auth.algorithm,
555                             elems.challenge - 2, elems.challenge_len + 2,
556                             wk->filter_ta, wk->probe_auth.key,
557                             wk->probe_auth.key_len, wk->probe_auth.key_idx);
558         wk->probe_auth.transaction = 4;
559 }
560
561 static enum work_action __must_check
562 ieee80211_rx_mgmt_auth(struct ieee80211_work *wk,
563                        struct ieee80211_mgmt *mgmt, size_t len)
564 {
565         u16 auth_alg, auth_transaction, status_code;
566
567         if (wk->type != IEEE80211_WORK_AUTH)
568                 return WORK_ACT_NONE;
569
570         if (len < 24 + 6)
571                 return WORK_ACT_NONE;
572
573         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
574         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
575         status_code = le16_to_cpu(mgmt->u.auth.status_code);
576
577         if (auth_alg != wk->probe_auth.algorithm ||
578             auth_transaction != wk->probe_auth.transaction)
579                 return WORK_ACT_NONE;
580
581         if (status_code != WLAN_STATUS_SUCCESS) {
582                 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
583                        wk->sdata->name, mgmt->sa, status_code);
584                 return WORK_ACT_DONE;
585         }
586
587         switch (wk->probe_auth.algorithm) {
588         case WLAN_AUTH_OPEN:
589         case WLAN_AUTH_LEAP:
590         case WLAN_AUTH_FT:
591                 break;
592         case WLAN_AUTH_SHARED_KEY:
593                 if (wk->probe_auth.transaction != 4) {
594                         ieee80211_auth_challenge(wk, mgmt, len);
595                         /* need another frame */
596                         return WORK_ACT_NONE;
597                 }
598                 break;
599         default:
600                 WARN_ON(1);
601                 return WORK_ACT_NONE;
602         }
603
604         printk(KERN_DEBUG "%s: authenticated\n", wk->sdata->name);
605         return WORK_ACT_DONE;
606 }
607
608 static enum work_action __must_check
609 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_work *wk,
610                              struct ieee80211_mgmt *mgmt, size_t len,
611                              bool reassoc)
612 {
613         struct ieee80211_sub_if_data *sdata = wk->sdata;
614         struct ieee80211_local *local = sdata->local;
615         u16 capab_info, status_code, aid;
616         struct ieee802_11_elems elems;
617         u8 *pos;
618
619         /*
620          * AssocResp and ReassocResp have identical structure, so process both
621          * of them in this function.
622          */
623
624         if (len < 24 + 6)
625                 return WORK_ACT_NONE;
626
627         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
628         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
629         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
630
631         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
632                "status=%d aid=%d)\n",
633                sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
634                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
635
636         pos = mgmt->u.assoc_resp.variable;
637         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
638
639         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
640             elems.timeout_int && elems.timeout_int_len == 5 &&
641             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
642                 u32 tu, ms;
643                 tu = get_unaligned_le32(elems.timeout_int + 1);
644                 ms = tu * 1024 / 1000;
645                 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
646                        "comeback duration %u TU (%u ms)\n",
647                        sdata->name, mgmt->sa, tu, ms);
648                 wk->timeout = jiffies + msecs_to_jiffies(ms);
649                 if (ms > IEEE80211_ASSOC_TIMEOUT)
650                         run_again(local, wk->timeout);
651                 return WORK_ACT_NONE;
652         }
653
654         if (status_code != WLAN_STATUS_SUCCESS)
655                 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
656                        sdata->name, mgmt->sa, status_code);
657         else
658                 printk(KERN_DEBUG "%s: associated\n", sdata->name);
659
660         return WORK_ACT_DONE;
661 }
662
663 static enum work_action __must_check
664 ieee80211_rx_mgmt_probe_resp(struct ieee80211_work *wk,
665                              struct ieee80211_mgmt *mgmt, size_t len,
666                              struct ieee80211_rx_status *rx_status)
667 {
668         struct ieee80211_sub_if_data *sdata = wk->sdata;
669         struct ieee80211_local *local = sdata->local;
670         size_t baselen;
671
672         ASSERT_WORK_MTX(local);
673
674         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
675         if (baselen > len)
676                 return WORK_ACT_NONE;
677
678         printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
679         return WORK_ACT_DONE;
680 }
681
682 static void ieee80211_work_rx_queued_mgmt(struct ieee80211_local *local,
683                                           struct sk_buff *skb)
684 {
685         struct ieee80211_rx_status *rx_status;
686         struct ieee80211_mgmt *mgmt;
687         struct ieee80211_work *wk;
688         enum work_action rma = WORK_ACT_NONE;
689         u16 fc;
690
691         rx_status = (struct ieee80211_rx_status *) skb->cb;
692         mgmt = (struct ieee80211_mgmt *) skb->data;
693         fc = le16_to_cpu(mgmt->frame_control);
694
695         mutex_lock(&local->work_mtx);
696
697         list_for_each_entry(wk, &local->work_list, list) {
698                 const u8 *bssid = NULL;
699
700                 switch (wk->type) {
701                 case IEEE80211_WORK_DIRECT_PROBE:
702                 case IEEE80211_WORK_AUTH:
703                 case IEEE80211_WORK_ASSOC:
704                         bssid = wk->filter_ta;
705                         break;
706                 default:
707                         continue;
708                 }
709
710                 /*
711                  * Before queuing, we already verified mgmt->sa,
712                  * so this is needed just for matching.
713                  */
714                 if (compare_ether_addr(bssid, mgmt->bssid))
715                         continue;
716
717                 switch (fc & IEEE80211_FCTL_STYPE) {
718                 case IEEE80211_STYPE_PROBE_RESP:
719                         rma = ieee80211_rx_mgmt_probe_resp(wk, mgmt, skb->len,
720                                                            rx_status);
721                         break;
722                 case IEEE80211_STYPE_AUTH:
723                         rma = ieee80211_rx_mgmt_auth(wk, mgmt, skb->len);
724                         break;
725                 case IEEE80211_STYPE_ASSOC_RESP:
726                         rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
727                                                            skb->len, false);
728                         break;
729                 case IEEE80211_STYPE_REASSOC_RESP:
730                         rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
731                                                            skb->len, true);
732                         break;
733                 default:
734                         WARN_ON(1);
735                 }
736                 /*
737                  * We've processed this frame for that work, so it can't
738                  * belong to another work struct.
739                  * NB: this is also required for correctness for 'rma'!
740                  */
741                 break;
742         }
743
744         switch (rma) {
745         case WORK_ACT_NONE:
746                 break;
747         case WORK_ACT_DONE:
748                 list_del_rcu(&wk->list);
749                 break;
750         default:
751                 WARN(1, "unexpected: %d", rma);
752         }
753
754         mutex_unlock(&local->work_mtx);
755
756         if (rma != WORK_ACT_DONE)
757                 goto out;
758
759         switch (wk->done(wk, skb)) {
760         case WORK_DONE_DESTROY:
761                 free_work(wk);
762                 break;
763         case WORK_DONE_REQUEUE:
764                 synchronize_rcu();
765                 wk->timeout = jiffies; /* run again directly */
766                 mutex_lock(&local->work_mtx);
767                 list_add_tail(&wk->list, &local->work_list);
768                 mutex_unlock(&local->work_mtx);
769         }
770
771  out:
772         kfree_skb(skb);
773 }
774
775 static void ieee80211_work_timer(unsigned long data)
776 {
777         struct ieee80211_local *local = (void *) data;
778
779         if (local->quiescing)
780                 return;
781
782         ieee80211_queue_work(&local->hw, &local->work_work);
783 }
784
785 static void ieee80211_work_work(struct work_struct *work)
786 {
787         struct ieee80211_local *local =
788                 container_of(work, struct ieee80211_local, work_work);
789         struct sk_buff *skb;
790         struct ieee80211_work *wk, *tmp;
791         LIST_HEAD(free_work);
792         enum work_action rma;
793
794         if (local->scanning)
795                 return;
796
797         /*
798          * ieee80211_queue_work() should have picked up most cases,
799          * here we'll pick the the rest.
800          */
801         if (WARN(local->suspended, "work scheduled while going to suspend\n"))
802                 return;
803
804         /* first process frames to avoid timing out while a frame is pending */
805         while ((skb = skb_dequeue(&local->work_skb_queue)))
806                 ieee80211_work_rx_queued_mgmt(local, skb);
807
808         ieee80211_recalc_idle(local);
809
810         mutex_lock(&local->work_mtx);
811
812         list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
813                 if (time_is_after_jiffies(wk->timeout)) {
814                         /*
815                          * This work item isn't supposed to be worked on
816                          * right now, but take care to adjust the timer
817                          * properly.
818                          */
819                         run_again(local, wk->timeout);
820                         continue;
821                 }
822
823                 switch (wk->type) {
824                 default:
825                         WARN_ON(1);
826                         /* nothing */
827                         rma = WORK_ACT_NONE;
828                         break;
829                 case IEEE80211_WORK_DIRECT_PROBE:
830                         rma = ieee80211_direct_probe(wk);
831                         break;
832                 case IEEE80211_WORK_AUTH:
833                         rma = ieee80211_authenticate(wk);
834                         break;
835                 case IEEE80211_WORK_ASSOC:
836                         rma = ieee80211_associate(wk);
837                         break;
838                 }
839
840                 switch (rma) {
841                 case WORK_ACT_NONE:
842                         /* no action required */
843                         break;
844                 case WORK_ACT_TIMEOUT:
845                         list_del_rcu(&wk->list);
846                         synchronize_rcu();
847                         list_add(&wk->list, &free_work);
848                         break;
849                 default:
850                         WARN(1, "unexpected: %d", rma);
851                 }
852         }
853
854         if (list_empty(&local->work_list) && local->scan_req)
855                 ieee80211_queue_delayed_work(&local->hw,
856                                              &local->scan_work,
857                                              round_jiffies_relative(0));
858
859         mutex_unlock(&local->work_mtx);
860
861         list_for_each_entry_safe(wk, tmp, &free_work, list) {
862                 wk->done(wk, NULL);
863                 list_del(&wk->list);
864                 kfree(wk);
865         }
866 }
867
868 void ieee80211_add_work(struct ieee80211_work *wk)
869 {
870         struct ieee80211_local *local;
871
872         if (WARN_ON(!wk->chan))
873                 return;
874
875         if (WARN_ON(!wk->sdata))
876                 return;
877
878         if (WARN_ON(!wk->done))
879                 return;
880
881         wk->timeout = jiffies;
882
883         local = wk->sdata->local;
884         mutex_lock(&local->work_mtx);
885         list_add_tail(&wk->list, &local->work_list);
886         mutex_unlock(&local->work_mtx);
887
888         ieee80211_queue_work(&local->hw, &local->work_work);
889 }
890
891 void ieee80211_work_init(struct ieee80211_local *local)
892 {
893         mutex_init(&local->work_mtx);
894         INIT_LIST_HEAD(&local->work_list);
895         setup_timer(&local->work_timer, ieee80211_work_timer,
896                     (unsigned long)local);
897         INIT_WORK(&local->work_work, ieee80211_work_work);
898         skb_queue_head_init(&local->work_skb_queue);
899 }
900
901 void ieee80211_work_purge(struct ieee80211_sub_if_data *sdata)
902 {
903         struct ieee80211_local *local = sdata->local;
904         struct ieee80211_work *wk, *tmp;
905
906         mutex_lock(&local->work_mtx);
907         list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
908                 if (wk->sdata != sdata)
909                         continue;
910                 list_del(&wk->list);
911                 free_work(wk);
912         }
913         mutex_unlock(&local->work_mtx);
914 }
915
916 ieee80211_rx_result ieee80211_work_rx_mgmt(struct ieee80211_sub_if_data *sdata,
917                                            struct sk_buff *skb)
918 {
919         struct ieee80211_local *local = sdata->local;
920         struct ieee80211_mgmt *mgmt;
921         struct ieee80211_work *wk;
922         u16 fc;
923
924         if (skb->len < 24)
925                 return RX_DROP_MONITOR;
926
927         mgmt = (struct ieee80211_mgmt *) skb->data;
928         fc = le16_to_cpu(mgmt->frame_control);
929
930         list_for_each_entry_rcu(wk, &local->work_list, list) {
931                 if (sdata != wk->sdata)
932                         continue;
933                 if (compare_ether_addr(wk->filter_ta, mgmt->sa))
934                         continue;
935                 if (compare_ether_addr(wk->filter_ta, mgmt->bssid))
936                         continue;
937
938                 switch (fc & IEEE80211_FCTL_STYPE) {
939                 case IEEE80211_STYPE_AUTH:
940                 case IEEE80211_STYPE_PROBE_RESP:
941                 case IEEE80211_STYPE_ASSOC_RESP:
942                 case IEEE80211_STYPE_REASSOC_RESP:
943                 case IEEE80211_STYPE_DEAUTH:
944                 case IEEE80211_STYPE_DISASSOC:
945                         skb_queue_tail(&local->work_skb_queue, skb);
946                         ieee80211_queue_work(&local->hw, &local->work_work);
947                         return RX_QUEUED;
948                 }
949         }
950
951         return RX_CONTINUE;
952 }