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Johannes Bergaf6b6372009-12-23 13:15:35 +01001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090022#include <linux/slab.h>
Johannes Bergaf6b6372009-12-23 13:15:35 +010023#include <net/mac80211.h>
24#include <asm/unaligned.h>
25
26#include "ieee80211_i.h"
27#include "rate.h"
Johannes Bergb2abb6e2011-07-19 10:39:53 +020028#include "driver-ops.h"
Johannes Bergaf6b6372009-12-23 13:15:35 +010029
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
Johannes Bergaf6b6372009-12-23 13:15:35 +010034
35enum work_action {
Johannes Bergb8d92c92010-05-11 12:42:04 +020036 WORK_ACT_MISMATCH,
Johannes Bergaf6b6372009-12-23 13:15:35 +010037 WORK_ACT_NONE,
38 WORK_ACT_TIMEOUT,
39 WORK_ACT_DONE,
40};
41
42
43/* utils */
44static inline void ASSERT_WORK_MTX(struct ieee80211_local *local)
45{
Johannes Berga1699b72010-07-30 16:46:07 +020046 lockdep_assert_held(&local->mtx);
Johannes Bergaf6b6372009-12-23 13:15:35 +010047}
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 */
59static 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
Johannes Bergaf6b6372009-12-23 13:15:35 +010069void free_work(struct ieee80211_work *wk)
70{
Lai Jiangshana74ce142011-03-18 12:14:15 +080071 kfree_rcu(wk, rcu_head);
Johannes Bergaf6b6372009-12-23 13:15:35 +010072}
73
74static 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
Johannes Berg77c81442009-12-23 13:15:37 +010097static 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;
Johannes Berg77c81442009-12-23 13:15:37 +0100106
107 if (!sband->ht_cap.ht_supported)
108 return;
109
110 if (!ht_info_ie)
111 return;
112
113 if (ht_info_ie[1] < sizeof(struct ieee80211_ht_info))
114 return;
115
116 ht_info = (struct ieee80211_ht_info *)(ht_info_ie + 2);
117
118 /* determine capability flags */
119
Johannes Berg77c81442009-12-23 13:15:37 +0100120 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
121 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
122 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
123 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
124 cap &= ~IEEE80211_HT_CAP_SGI_40;
125 }
126 break;
127 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
128 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
129 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
130 cap &= ~IEEE80211_HT_CAP_SGI_40;
131 }
132 break;
133 }
134
135 /* set SM PS mode properly */
136 cap &= ~IEEE80211_HT_CAP_SM_PS;
137 switch (smps) {
138 case IEEE80211_SMPS_AUTOMATIC:
139 case IEEE80211_SMPS_NUM_MODES:
140 WARN_ON(1);
141 case IEEE80211_SMPS_OFF:
142 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
143 IEEE80211_HT_CAP_SM_PS_SHIFT;
144 break;
145 case IEEE80211_SMPS_STATIC:
146 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
147 IEEE80211_HT_CAP_SM_PS_SHIFT;
148 break;
149 case IEEE80211_SMPS_DYNAMIC:
150 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
151 IEEE80211_HT_CAP_SM_PS_SHIFT;
152 break;
153 }
154
155 /* reserve and fill IE */
Johannes Berg77c81442009-12-23 13:15:37 +0100156 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
Alexander Simon42e7aa72011-10-26 14:47:26 -0700157 ieee80211_ie_build_ht_cap(pos, sband, cap);
Johannes Berg77c81442009-12-23 13:15:37 +0100158}
159
Johannes Bergaf6b6372009-12-23 13:15:35 +0100160static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
161 struct ieee80211_work *wk)
162{
163 struct ieee80211_local *local = sdata->local;
164 struct sk_buff *skb;
165 struct ieee80211_mgmt *mgmt;
Kalle Valoab133152010-01-12 10:42:31 +0200166 u8 *pos, qos_info;
Johannes Berg8e664fb2009-12-23 13:15:38 +0100167 size_t offset = 0, noffset;
Rajkumar Manoharan0915cba2011-04-25 15:56:17 +0530168 int i, count, rates_len, supp_rates_len;
Johannes Bergaf6b6372009-12-23 13:15:35 +0100169 u16 capab;
170 struct ieee80211_supported_band *sband;
171 u32 rates = 0;
172
Johannes Berg77c81442009-12-23 13:15:37 +0100173 sband = local->hw.wiphy->bands[wk->chan->band];
174
Stanislaw Gruszka76f27362010-04-28 17:03:15 +0200175 if (wk->assoc.supp_rates_len) {
176 /*
177 * Get all rates supported by the device and the AP as
178 * some APs don't like getting a superset of their rates
179 * in the association request (e.g. D-Link DAP 1353 in
180 * b-only mode)...
181 */
182 rates_len = ieee80211_compatible_rates(wk->assoc.supp_rates,
183 wk->assoc.supp_rates_len,
184 sband, &rates);
185 } else {
186 /*
187 * In case AP not provide any supported rates information
188 * before association, we send information element(s) with
189 * all rates that we support.
190 */
191 rates = ~0;
192 rates_len = sband->n_bitrates;
193 }
Johannes Berg77c81442009-12-23 13:15:37 +0100194
195 skb = alloc_skb(local->hw.extra_tx_headroom +
196 sizeof(*mgmt) + /* bit too much but doesn't matter */
197 2 + wk->assoc.ssid_len + /* SSID */
198 4 + rates_len + /* (extended) rates */
199 4 + /* power capability */
200 2 + 2 * sband->n_channels + /* supported channels */
201 2 + sizeof(struct ieee80211_ht_cap) + /* HT */
202 wk->ie_len + /* extra IEs */
203 9, /* WMM */
204 GFP_KERNEL);
Joe Perchesd15b8452011-08-29 14:17:31 -0700205 if (!skb)
Johannes Bergaf6b6372009-12-23 13:15:35 +0100206 return;
Joe Perchesd15b8452011-08-29 14:17:31 -0700207
Johannes Bergaf6b6372009-12-23 13:15:35 +0100208 skb_reserve(skb, local->hw.extra_tx_headroom);
209
Johannes Bergaf6b6372009-12-23 13:15:35 +0100210 capab = WLAN_CAPABILITY_ESS;
211
212 if (sband->band == IEEE80211_BAND_2GHZ) {
213 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
214 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
215 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
216 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
217 }
218
219 if (wk->assoc.capability & WLAN_CAPABILITY_PRIVACY)
220 capab |= WLAN_CAPABILITY_PRIVACY;
221
Johannes Bergaf6b6372009-12-23 13:15:35 +0100222 if ((wk->assoc.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
223 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
224 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
225
226 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
227 memset(mgmt, 0, 24);
228 memcpy(mgmt->da, wk->filter_ta, ETH_ALEN);
229 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
230 memcpy(mgmt->bssid, wk->filter_ta, ETH_ALEN);
231
232 if (!is_zero_ether_addr(wk->assoc.prev_bssid)) {
233 skb_put(skb, 10);
234 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
235 IEEE80211_STYPE_REASSOC_REQ);
236 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
237 mgmt->u.reassoc_req.listen_interval =
238 cpu_to_le16(local->hw.conf.listen_interval);
239 memcpy(mgmt->u.reassoc_req.current_ap, wk->assoc.prev_bssid,
240 ETH_ALEN);
241 } else {
242 skb_put(skb, 4);
243 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
244 IEEE80211_STYPE_ASSOC_REQ);
245 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
246 mgmt->u.assoc_req.listen_interval =
247 cpu_to_le16(local->hw.conf.listen_interval);
248 }
249
250 /* SSID */
Rajkumar Manoharan0915cba2011-04-25 15:56:17 +0530251 pos = skb_put(skb, 2 + wk->assoc.ssid_len);
Johannes Bergaf6b6372009-12-23 13:15:35 +0100252 *pos++ = WLAN_EID_SSID;
253 *pos++ = wk->assoc.ssid_len;
254 memcpy(pos, wk->assoc.ssid, wk->assoc.ssid_len);
255
256 /* add all rates which were marked to be used above */
257 supp_rates_len = rates_len;
258 if (supp_rates_len > 8)
259 supp_rates_len = 8;
260
Johannes Bergaf6b6372009-12-23 13:15:35 +0100261 pos = skb_put(skb, supp_rates_len + 2);
262 *pos++ = WLAN_EID_SUPP_RATES;
263 *pos++ = supp_rates_len;
264
265 count = 0;
266 for (i = 0; i < sband->n_bitrates; i++) {
267 if (BIT(i) & rates) {
268 int rate = sband->bitrates[i].bitrate;
269 *pos++ = (u8) (rate / 5);
270 if (++count == 8)
271 break;
272 }
273 }
274
275 if (rates_len > count) {
276 pos = skb_put(skb, rates_len - count + 2);
277 *pos++ = WLAN_EID_EXT_SUPP_RATES;
278 *pos++ = rates_len - count;
279
280 for (i++; i < sband->n_bitrates; i++) {
281 if (BIT(i) & rates) {
282 int rate = sband->bitrates[i].bitrate;
283 *pos++ = (u8) (rate / 5);
284 }
285 }
286 }
287
288 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
289 /* 1. power capabilities */
290 pos = skb_put(skb, 4);
291 *pos++ = WLAN_EID_PWR_CAPABILITY;
292 *pos++ = 2;
293 *pos++ = 0; /* min tx power */
Johannes Berg77c81442009-12-23 13:15:37 +0100294 *pos++ = wk->chan->max_power; /* max tx power */
Johannes Bergaf6b6372009-12-23 13:15:35 +0100295
296 /* 2. supported channels */
297 /* TODO: get this in reg domain format */
298 pos = skb_put(skb, 2 * sband->n_channels + 2);
299 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
300 *pos++ = 2 * sband->n_channels;
301 for (i = 0; i < sband->n_channels; i++) {
302 *pos++ = ieee80211_frequency_to_channel(
303 sband->channels[i].center_freq);
304 *pos++ = 1; /* one channel in the subband*/
305 }
306 }
307
Johannes Berg8e664fb2009-12-23 13:15:38 +0100308 /* if present, add any custom IEs that go before HT */
Johannes Bergaf6b6372009-12-23 13:15:35 +0100309 if (wk->ie_len && wk->ie) {
Johannes Berg8e664fb2009-12-23 13:15:38 +0100310 static const u8 before_ht[] = {
311 WLAN_EID_SSID,
312 WLAN_EID_SUPP_RATES,
313 WLAN_EID_EXT_SUPP_RATES,
314 WLAN_EID_PWR_CAPABILITY,
315 WLAN_EID_SUPPORTED_CHANNELS,
316 WLAN_EID_RSN,
317 WLAN_EID_QOS_CAPA,
318 WLAN_EID_RRM_ENABLED_CAPABILITIES,
319 WLAN_EID_MOBILITY_DOMAIN,
320 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
321 };
322 noffset = ieee80211_ie_split(wk->ie, wk->ie_len,
323 before_ht, ARRAY_SIZE(before_ht),
324 offset);
325 pos = skb_put(skb, noffset - offset);
326 memcpy(pos, wk->ie + offset, noffset - offset);
327 offset = noffset;
Johannes Bergaf6b6372009-12-23 13:15:35 +0100328 }
329
Johannes Berg77c81442009-12-23 13:15:37 +0100330 if (wk->assoc.use_11n && wk->assoc.wmm_used &&
331 local->hw.queues >= 4)
332 ieee80211_add_ht_ie(skb, wk->assoc.ht_information_ie,
333 sband, wk->chan, wk->assoc.smps);
334
Johannes Berg8e664fb2009-12-23 13:15:38 +0100335 /* if present, add any custom non-vendor IEs that go after HT */
336 if (wk->ie_len && wk->ie) {
337 noffset = ieee80211_ie_split_vendor(wk->ie, wk->ie_len,
338 offset);
339 pos = skb_put(skb, noffset - offset);
340 memcpy(pos, wk->ie + offset, noffset - offset);
341 offset = noffset;
342 }
343
Johannes Bergaf6b6372009-12-23 13:15:35 +0100344 if (wk->assoc.wmm_used && local->hw.queues >= 4) {
Kalle Valoab133152010-01-12 10:42:31 +0200345 if (wk->assoc.uapsd_used) {
Kalle Valo50ae0cf2010-01-12 10:42:39 +0200346 qos_info = local->uapsd_queues;
347 qos_info |= (local->uapsd_max_sp_len <<
Kalle Valoab133152010-01-12 10:42:31 +0200348 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
349 } else {
350 qos_info = 0;
351 }
352
Johannes Bergaf6b6372009-12-23 13:15:35 +0100353 pos = skb_put(skb, 9);
354 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
355 *pos++ = 7; /* len */
356 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
357 *pos++ = 0x50;
358 *pos++ = 0xf2;
359 *pos++ = 2; /* WME */
360 *pos++ = 0; /* WME info */
361 *pos++ = 1; /* WME ver */
Kalle Valoab133152010-01-12 10:42:31 +0200362 *pos++ = qos_info;
Johannes Bergaf6b6372009-12-23 13:15:35 +0100363 }
364
Johannes Berg8e664fb2009-12-23 13:15:38 +0100365 /* add any remaining custom (i.e. vendor specific here) IEs */
366 if (wk->ie_len && wk->ie) {
367 noffset = wk->ie_len;
368 pos = skb_put(skb, noffset - offset);
369 memcpy(pos, wk->ie + offset, noffset - offset);
370 }
371
Johannes Bergaf6b6372009-12-23 13:15:35 +0100372 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
373 ieee80211_tx_skb(sdata, skb);
374}
375
376static void ieee80211_remove_auth_bss(struct ieee80211_local *local,
377 struct ieee80211_work *wk)
378{
379 struct cfg80211_bss *cbss;
380 u16 capa_val = WLAN_CAPABILITY_ESS;
381
382 if (wk->probe_auth.privacy)
383 capa_val |= WLAN_CAPABILITY_PRIVACY;
384
385 cbss = cfg80211_get_bss(local->hw.wiphy, wk->chan, wk->filter_ta,
386 wk->probe_auth.ssid, wk->probe_auth.ssid_len,
387 WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
388 capa_val);
389 if (!cbss)
390 return;
391
392 cfg80211_unlink_bss(local->hw.wiphy, cbss);
393 cfg80211_put_bss(cbss);
394}
395
396static enum work_action __must_check
397ieee80211_direct_probe(struct ieee80211_work *wk)
398{
399 struct ieee80211_sub_if_data *sdata = wk->sdata;
400 struct ieee80211_local *local = sdata->local;
401
Johannes Bergb2abb6e2011-07-19 10:39:53 +0200402 if (!wk->probe_auth.synced) {
403 int ret = drv_tx_sync(local, sdata, wk->filter_ta,
404 IEEE80211_TX_SYNC_AUTH);
405 if (ret)
406 return WORK_ACT_TIMEOUT;
407 }
408 wk->probe_auth.synced = true;
409
Johannes Bergaf6b6372009-12-23 13:15:35 +0100410 wk->probe_auth.tries++;
411 if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
Johannes Berg7d3a1c32009-12-23 13:15:36 +0100412 printk(KERN_DEBUG "%s: direct probe to %pM timed out\n",
Johannes Bergaf6b6372009-12-23 13:15:35 +0100413 sdata->name, wk->filter_ta);
414
415 /*
416 * Most likely AP is not in the range so remove the
417 * bss struct for that AP.
418 */
419 ieee80211_remove_auth_bss(local, wk);
420
Johannes Bergaf6b6372009-12-23 13:15:35 +0100421 return WORK_ACT_TIMEOUT;
422 }
423
Ben Greear2f886752010-12-07 11:27:01 -0800424 printk(KERN_DEBUG "%s: direct probe to %pM (try %d/%i)\n",
425 sdata->name, wk->filter_ta, wk->probe_auth.tries,
426 IEEE80211_AUTH_MAX_TRIES);
Johannes Bergaf6b6372009-12-23 13:15:35 +0100427
428 /*
429 * Direct probe is sent to broadcast address as some APs
430 * will not answer to direct packet in unassociated state.
431 */
432 ieee80211_send_probe_req(sdata, NULL, wk->probe_auth.ssid,
Johannes Berg85a237f2011-07-18 18:08:36 +0200433 wk->probe_auth.ssid_len, NULL, 0,
Rajkumar Manoharanaad14ce2011-09-25 14:53:31 +0530434 (u32) -1, true, false);
Johannes Bergaf6b6372009-12-23 13:15:35 +0100435
436 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
437 run_again(local, wk->timeout);
438
439 return WORK_ACT_NONE;
440}
441
442
443static enum work_action __must_check
444ieee80211_authenticate(struct ieee80211_work *wk)
445{
446 struct ieee80211_sub_if_data *sdata = wk->sdata;
447 struct ieee80211_local *local = sdata->local;
448
Johannes Bergb2abb6e2011-07-19 10:39:53 +0200449 if (!wk->probe_auth.synced) {
450 int ret = drv_tx_sync(local, sdata, wk->filter_ta,
451 IEEE80211_TX_SYNC_AUTH);
452 if (ret)
453 return WORK_ACT_TIMEOUT;
454 }
455 wk->probe_auth.synced = true;
456
Johannes Bergaf6b6372009-12-23 13:15:35 +0100457 wk->probe_auth.tries++;
458 if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
Johannes Berg7d3a1c32009-12-23 13:15:36 +0100459 printk(KERN_DEBUG "%s: authentication with %pM"
Johannes Bergaf6b6372009-12-23 13:15:35 +0100460 " timed out\n", sdata->name, wk->filter_ta);
461
462 /*
463 * Most likely AP is not in the range so remove the
464 * bss struct for that AP.
465 */
466 ieee80211_remove_auth_bss(local, wk);
467
Johannes Bergaf6b6372009-12-23 13:15:35 +0100468 return WORK_ACT_TIMEOUT;
469 }
470
Johannes Berg7d3a1c32009-12-23 13:15:36 +0100471 printk(KERN_DEBUG "%s: authenticate with %pM (try %d)\n",
Johannes Bergaf6b6372009-12-23 13:15:35 +0100472 sdata->name, wk->filter_ta, wk->probe_auth.tries);
473
474 ieee80211_send_auth(sdata, 1, wk->probe_auth.algorithm, wk->ie,
475 wk->ie_len, wk->filter_ta, NULL, 0, 0);
476 wk->probe_auth.transaction = 2;
477
478 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
479 run_again(local, wk->timeout);
480
481 return WORK_ACT_NONE;
482}
483
484static enum work_action __must_check
485ieee80211_associate(struct ieee80211_work *wk)
486{
487 struct ieee80211_sub_if_data *sdata = wk->sdata;
488 struct ieee80211_local *local = sdata->local;
489
Johannes Bergb2abb6e2011-07-19 10:39:53 +0200490 if (!wk->assoc.synced) {
491 int ret = drv_tx_sync(local, sdata, wk->filter_ta,
492 IEEE80211_TX_SYNC_ASSOC);
493 if (ret)
494 return WORK_ACT_TIMEOUT;
495 }
496 wk->assoc.synced = true;
497
Johannes Bergaf6b6372009-12-23 13:15:35 +0100498 wk->assoc.tries++;
499 if (wk->assoc.tries > IEEE80211_ASSOC_MAX_TRIES) {
Johannes Berg7d3a1c32009-12-23 13:15:36 +0100500 printk(KERN_DEBUG "%s: association with %pM"
Johannes Bergaf6b6372009-12-23 13:15:35 +0100501 " timed out\n",
502 sdata->name, wk->filter_ta);
503
504 /*
505 * Most likely AP is not in the range so remove the
506 * bss struct for that AP.
507 */
508 if (wk->assoc.bss)
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100509 cfg80211_unlink_bss(local->hw.wiphy, wk->assoc.bss);
Johannes Bergaf6b6372009-12-23 13:15:35 +0100510
Johannes Bergaf6b6372009-12-23 13:15:35 +0100511 return WORK_ACT_TIMEOUT;
512 }
513
Johannes Berg7d3a1c32009-12-23 13:15:36 +0100514 printk(KERN_DEBUG "%s: associate with %pM (try %d)\n",
Johannes Bergaf6b6372009-12-23 13:15:35 +0100515 sdata->name, wk->filter_ta, wk->assoc.tries);
516 ieee80211_send_assoc(sdata, wk);
517
518 wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
519 run_again(local, wk->timeout);
520
521 return WORK_ACT_NONE;
522}
523
Johannes Bergb8bc4b02009-12-23 13:15:42 +0100524static enum work_action __must_check
525ieee80211_remain_on_channel_timeout(struct ieee80211_work *wk)
526{
Johannes Bergb8bc4b02009-12-23 13:15:42 +0100527 /*
528 * First time we run, do nothing -- the generic code will
529 * have switched to the right channel etc.
530 */
Johannes Berg723bae72010-01-25 13:36:36 +0100531 if (!wk->started) {
Johannes Berge4da8c32009-12-23 13:15:43 +0100532 wk->timeout = jiffies + msecs_to_jiffies(wk->remain.duration);
533
Kalle Valo1990ca62009-12-30 14:42:20 +0200534 cfg80211_ready_on_channel(wk->sdata->dev, (unsigned long) wk,
535 wk->chan, wk->chan_type,
536 wk->remain.duration, GFP_KERNEL);
Johannes Berge4da8c32009-12-23 13:15:43 +0100537
Johannes Bergb8bc4b02009-12-23 13:15:42 +0100538 return WORK_ACT_NONE;
539 }
540
Johannes Berge4da8c32009-12-23 13:15:43 +0100541 return WORK_ACT_TIMEOUT;
Johannes Bergb8bc4b02009-12-23 13:15:42 +0100542}
543
Johannes Berge5b900d2010-07-29 16:08:55 +0200544static enum work_action __must_check
Johannes Bergf30221e2010-11-25 10:02:30 +0100545ieee80211_offchannel_tx(struct ieee80211_work *wk)
546{
547 if (!wk->started) {
548 wk->timeout = jiffies + msecs_to_jiffies(wk->offchan_tx.wait);
549
550 /*
551 * After this, offchan_tx.frame remains but now is no
552 * longer a valid pointer -- we still need it as the
Johannes Berg28a1bcd2011-10-04 18:27:10 +0200553 * cookie for canceling this work/status matching.
Johannes Bergf30221e2010-11-25 10:02:30 +0100554 */
555 ieee80211_tx_skb(wk->sdata, wk->offchan_tx.frame);
556
557 return WORK_ACT_NONE;
558 }
559
560 return WORK_ACT_TIMEOUT;
561}
562
563static enum work_action __must_check
Johannes Berge5b900d2010-07-29 16:08:55 +0200564ieee80211_assoc_beacon_wait(struct ieee80211_work *wk)
565{
566 if (wk->started)
567 return WORK_ACT_TIMEOUT;
568
569 /*
570 * Wait up to one beacon interval ...
571 * should this be more if we miss one?
572 */
573 printk(KERN_DEBUG "%s: waiting for beacon from %pM\n",
574 wk->sdata->name, wk->filter_ta);
575 wk->timeout = TU_TO_EXP_TIME(wk->assoc.bss->beacon_interval);
576 return WORK_ACT_NONE;
577}
578
Johannes Bergaf6b6372009-12-23 13:15:35 +0100579static void ieee80211_auth_challenge(struct ieee80211_work *wk,
580 struct ieee80211_mgmt *mgmt,
581 size_t len)
582{
583 struct ieee80211_sub_if_data *sdata = wk->sdata;
584 u8 *pos;
585 struct ieee802_11_elems elems;
586
587 pos = mgmt->u.auth.variable;
588 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
589 if (!elems.challenge)
590 return;
591 ieee80211_send_auth(sdata, 3, wk->probe_auth.algorithm,
592 elems.challenge - 2, elems.challenge_len + 2,
593 wk->filter_ta, wk->probe_auth.key,
594 wk->probe_auth.key_len, wk->probe_auth.key_idx);
595 wk->probe_auth.transaction = 4;
596}
597
598static enum work_action __must_check
599ieee80211_rx_mgmt_auth(struct ieee80211_work *wk,
600 struct ieee80211_mgmt *mgmt, size_t len)
601{
602 u16 auth_alg, auth_transaction, status_code;
603
604 if (wk->type != IEEE80211_WORK_AUTH)
Johannes Bergb8d92c92010-05-11 12:42:04 +0200605 return WORK_ACT_MISMATCH;
Johannes Bergaf6b6372009-12-23 13:15:35 +0100606
607 if (len < 24 + 6)
608 return WORK_ACT_NONE;
609
610 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
611 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
612 status_code = le16_to_cpu(mgmt->u.auth.status_code);
613
614 if (auth_alg != wk->probe_auth.algorithm ||
615 auth_transaction != wk->probe_auth.transaction)
616 return WORK_ACT_NONE;
617
618 if (status_code != WLAN_STATUS_SUCCESS) {
619 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
620 wk->sdata->name, mgmt->sa, status_code);
621 return WORK_ACT_DONE;
622 }
623
624 switch (wk->probe_auth.algorithm) {
625 case WLAN_AUTH_OPEN:
626 case WLAN_AUTH_LEAP:
627 case WLAN_AUTH_FT:
628 break;
629 case WLAN_AUTH_SHARED_KEY:
630 if (wk->probe_auth.transaction != 4) {
631 ieee80211_auth_challenge(wk, mgmt, len);
632 /* need another frame */
633 return WORK_ACT_NONE;
634 }
635 break;
636 default:
637 WARN_ON(1);
638 return WORK_ACT_NONE;
639 }
640
641 printk(KERN_DEBUG "%s: authenticated\n", wk->sdata->name);
642 return WORK_ACT_DONE;
643}
644
645static enum work_action __must_check
646ieee80211_rx_mgmt_assoc_resp(struct ieee80211_work *wk,
647 struct ieee80211_mgmt *mgmt, size_t len,
648 bool reassoc)
649{
650 struct ieee80211_sub_if_data *sdata = wk->sdata;
651 struct ieee80211_local *local = sdata->local;
652 u16 capab_info, status_code, aid;
653 struct ieee802_11_elems elems;
654 u8 *pos;
655
Johannes Bergb8d92c92010-05-11 12:42:04 +0200656 if (wk->type != IEEE80211_WORK_ASSOC)
657 return WORK_ACT_MISMATCH;
658
Johannes Bergaf6b6372009-12-23 13:15:35 +0100659 /*
660 * AssocResp and ReassocResp have identical structure, so process both
661 * of them in this function.
662 */
663
664 if (len < 24 + 6)
665 return WORK_ACT_NONE;
666
667 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
668 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
669 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
670
671 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
672 "status=%d aid=%d)\n",
673 sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
674 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
675
676 pos = mgmt->u.assoc_resp.variable;
677 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
678
679 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
680 elems.timeout_int && elems.timeout_int_len == 5 &&
681 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
682 u32 tu, ms;
683 tu = get_unaligned_le32(elems.timeout_int + 1);
684 ms = tu * 1024 / 1000;
Johannes Berg7d3a1c32009-12-23 13:15:36 +0100685 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
Johannes Bergaf6b6372009-12-23 13:15:35 +0100686 "comeback duration %u TU (%u ms)\n",
Johannes Berg7d3a1c32009-12-23 13:15:36 +0100687 sdata->name, mgmt->sa, tu, ms);
Johannes Bergaf6b6372009-12-23 13:15:35 +0100688 wk->timeout = jiffies + msecs_to_jiffies(ms);
689 if (ms > IEEE80211_ASSOC_TIMEOUT)
690 run_again(local, wk->timeout);
691 return WORK_ACT_NONE;
692 }
693
694 if (status_code != WLAN_STATUS_SUCCESS)
Johannes Berg7d3a1c32009-12-23 13:15:36 +0100695 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
696 sdata->name, mgmt->sa, status_code);
Johannes Bergaf6b6372009-12-23 13:15:35 +0100697 else
698 printk(KERN_DEBUG "%s: associated\n", sdata->name);
699
700 return WORK_ACT_DONE;
701}
702
703static enum work_action __must_check
704ieee80211_rx_mgmt_probe_resp(struct ieee80211_work *wk,
705 struct ieee80211_mgmt *mgmt, size_t len,
706 struct ieee80211_rx_status *rx_status)
707{
708 struct ieee80211_sub_if_data *sdata = wk->sdata;
709 struct ieee80211_local *local = sdata->local;
710 size_t baselen;
711
712 ASSERT_WORK_MTX(local);
713
Johannes Bergb8d92c92010-05-11 12:42:04 +0200714 if (wk->type != IEEE80211_WORK_DIRECT_PROBE)
715 return WORK_ACT_MISMATCH;
716
717 if (len < 24 + 12)
718 return WORK_ACT_NONE;
719
Johannes Bergaf6b6372009-12-23 13:15:35 +0100720 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
721 if (baselen > len)
722 return WORK_ACT_NONE;
723
724 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
725 return WORK_ACT_DONE;
726}
727
Johannes Berge5b900d2010-07-29 16:08:55 +0200728static enum work_action __must_check
729ieee80211_rx_mgmt_beacon(struct ieee80211_work *wk,
730 struct ieee80211_mgmt *mgmt, size_t len)
731{
732 struct ieee80211_sub_if_data *sdata = wk->sdata;
733 struct ieee80211_local *local = sdata->local;
734
735 ASSERT_WORK_MTX(local);
736
737 if (wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
738 return WORK_ACT_MISMATCH;
739
740 if (len < 24 + 12)
741 return WORK_ACT_NONE;
742
743 printk(KERN_DEBUG "%s: beacon received\n", sdata->name);
744 return WORK_ACT_DONE;
745}
746
Johannes Bergaf6b6372009-12-23 13:15:35 +0100747static void ieee80211_work_rx_queued_mgmt(struct ieee80211_local *local,
748 struct sk_buff *skb)
749{
750 struct ieee80211_rx_status *rx_status;
751 struct ieee80211_mgmt *mgmt;
752 struct ieee80211_work *wk;
Christoph Fritz021570e2010-06-16 16:37:34 +0200753 enum work_action rma = WORK_ACT_NONE;
Johannes Bergaf6b6372009-12-23 13:15:35 +0100754 u16 fc;
755
756 rx_status = (struct ieee80211_rx_status *) skb->cb;
757 mgmt = (struct ieee80211_mgmt *) skb->data;
758 fc = le16_to_cpu(mgmt->frame_control);
759
Johannes Berga1699b72010-07-30 16:46:07 +0200760 mutex_lock(&local->mtx);
Johannes Bergaf6b6372009-12-23 13:15:35 +0100761
762 list_for_each_entry(wk, &local->work_list, list) {
763 const u8 *bssid = NULL;
764
765 switch (wk->type) {
766 case IEEE80211_WORK_DIRECT_PROBE:
767 case IEEE80211_WORK_AUTH:
768 case IEEE80211_WORK_ASSOC:
Johannes Berge5b900d2010-07-29 16:08:55 +0200769 case IEEE80211_WORK_ASSOC_BEACON_WAIT:
Johannes Bergaf6b6372009-12-23 13:15:35 +0100770 bssid = wk->filter_ta;
771 break;
772 default:
773 continue;
774 }
775
776 /*
777 * Before queuing, we already verified mgmt->sa,
778 * so this is needed just for matching.
779 */
780 if (compare_ether_addr(bssid, mgmt->bssid))
781 continue;
782
783 switch (fc & IEEE80211_FCTL_STYPE) {
Johannes Berge5b900d2010-07-29 16:08:55 +0200784 case IEEE80211_STYPE_BEACON:
785 rma = ieee80211_rx_mgmt_beacon(wk, mgmt, skb->len);
786 break;
Johannes Bergaf6b6372009-12-23 13:15:35 +0100787 case IEEE80211_STYPE_PROBE_RESP:
788 rma = ieee80211_rx_mgmt_probe_resp(wk, mgmt, skb->len,
789 rx_status);
790 break;
791 case IEEE80211_STYPE_AUTH:
792 rma = ieee80211_rx_mgmt_auth(wk, mgmt, skb->len);
793 break;
794 case IEEE80211_STYPE_ASSOC_RESP:
795 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
796 skb->len, false);
797 break;
798 case IEEE80211_STYPE_REASSOC_RESP:
799 rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
800 skb->len, true);
801 break;
802 default:
803 WARN_ON(1);
Johannes Bergb8d92c92010-05-11 12:42:04 +0200804 rma = WORK_ACT_NONE;
Johannes Bergaf6b6372009-12-23 13:15:35 +0100805 }
Johannes Bergb8d92c92010-05-11 12:42:04 +0200806
807 /*
808 * We've either received an unexpected frame, or we have
809 * multiple work items and need to match the frame to the
810 * right one.
811 */
812 if (rma == WORK_ACT_MISMATCH)
813 continue;
814
Johannes Bergaf6b6372009-12-23 13:15:35 +0100815 /*
816 * We've processed this frame for that work, so it can't
817 * belong to another work struct.
818 * NB: this is also required for correctness for 'rma'!
819 */
820 break;
821 }
822
823 switch (rma) {
Johannes Bergb8d92c92010-05-11 12:42:04 +0200824 case WORK_ACT_MISMATCH:
825 /* ignore this unmatched frame */
826 break;
Johannes Bergaf6b6372009-12-23 13:15:35 +0100827 case WORK_ACT_NONE:
828 break;
829 case WORK_ACT_DONE:
830 list_del_rcu(&wk->list);
831 break;
832 default:
833 WARN(1, "unexpected: %d", rma);
834 }
835
Johannes Berga1699b72010-07-30 16:46:07 +0200836 mutex_unlock(&local->mtx);
Johannes Bergaf6b6372009-12-23 13:15:35 +0100837
838 if (rma != WORK_ACT_DONE)
839 goto out;
840
841 switch (wk->done(wk, skb)) {
842 case WORK_DONE_DESTROY:
843 free_work(wk);
844 break;
845 case WORK_DONE_REQUEUE:
846 synchronize_rcu();
Johannes Berge4da8c32009-12-23 13:15:43 +0100847 wk->started = false; /* restart */
Johannes Berga1699b72010-07-30 16:46:07 +0200848 mutex_lock(&local->mtx);
Johannes Bergaf6b6372009-12-23 13:15:35 +0100849 list_add_tail(&wk->list, &local->work_list);
Johannes Berga1699b72010-07-30 16:46:07 +0200850 mutex_unlock(&local->mtx);
Johannes Bergaf6b6372009-12-23 13:15:35 +0100851 }
852
853 out:
854 kfree_skb(skb);
855}
856
Ben Greearda2fd1f2011-02-07 13:44:36 -0800857static bool ieee80211_work_ct_coexists(enum nl80211_channel_type wk_ct,
858 enum nl80211_channel_type oper_ct)
859{
860 switch (wk_ct) {
861 case NL80211_CHAN_NO_HT:
862 return true;
863 case NL80211_CHAN_HT20:
864 if (oper_ct != NL80211_CHAN_NO_HT)
865 return true;
866 return false;
867 case NL80211_CHAN_HT40MINUS:
868 case NL80211_CHAN_HT40PLUS:
869 return (wk_ct == oper_ct);
870 }
871 WARN_ON(1); /* shouldn't get here */
872 return false;
873}
874
875static enum nl80211_channel_type
876ieee80211_calc_ct(enum nl80211_channel_type wk_ct,
877 enum nl80211_channel_type oper_ct)
878{
879 switch (wk_ct) {
880 case NL80211_CHAN_NO_HT:
881 return oper_ct;
882 case NL80211_CHAN_HT20:
883 if (oper_ct != NL80211_CHAN_NO_HT)
884 return oper_ct;
885 return wk_ct;
886 case NL80211_CHAN_HT40MINUS:
887 case NL80211_CHAN_HT40PLUS:
888 return wk_ct;
889 }
890 WARN_ON(1); /* shouldn't get here */
891 return wk_ct;
892}
893
894
Johannes Bergaf6b6372009-12-23 13:15:35 +0100895static void ieee80211_work_timer(unsigned long data)
896{
897 struct ieee80211_local *local = (void *) data;
898
899 if (local->quiescing)
900 return;
901
902 ieee80211_queue_work(&local->hw, &local->work_work);
903}
904
905static void ieee80211_work_work(struct work_struct *work)
906{
907 struct ieee80211_local *local =
908 container_of(work, struct ieee80211_local, work_work);
909 struct sk_buff *skb;
910 struct ieee80211_work *wk, *tmp;
911 LIST_HEAD(free_work);
912 enum work_action rma;
Johannes Berge4da8c32009-12-23 13:15:43 +0100913 bool remain_off_channel = false;
Johannes Bergaf6b6372009-12-23 13:15:35 +0100914
915 if (local->scanning)
916 return;
917
918 /*
919 * ieee80211_queue_work() should have picked up most cases,
Walter Goldens77c20612010-05-18 04:44:54 -0700920 * here we'll pick the rest.
Johannes Bergaf6b6372009-12-23 13:15:35 +0100921 */
922 if (WARN(local->suspended, "work scheduled while going to suspend\n"))
923 return;
924
925 /* first process frames to avoid timing out while a frame is pending */
926 while ((skb = skb_dequeue(&local->work_skb_queue)))
927 ieee80211_work_rx_queued_mgmt(local, skb);
928
Johannes Berga1699b72010-07-30 16:46:07 +0200929 mutex_lock(&local->mtx);
Johannes Bergaf6b6372009-12-23 13:15:35 +0100930
Johannes Berg7da7cc12010-08-05 17:02:38 +0200931 ieee80211_recalc_idle(local);
932
Johannes Bergaf6b6372009-12-23 13:15:35 +0100933 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
Johannes Berg723bae72010-01-25 13:36:36 +0100934 bool started = wk->started;
935
Johannes Berge4da8c32009-12-23 13:15:43 +0100936 /* mark work as started if it's on the current off-channel */
Johannes Berg723bae72010-01-25 13:36:36 +0100937 if (!started && local->tmp_channel &&
Johannes Berge4da8c32009-12-23 13:15:43 +0100938 wk->chan == local->tmp_channel &&
939 wk->chan_type == local->tmp_channel_type) {
Johannes Berg723bae72010-01-25 13:36:36 +0100940 started = true;
Johannes Berg81ac3462010-01-06 15:30:58 +0100941 wk->timeout = jiffies;
Johannes Berge4da8c32009-12-23 13:15:43 +0100942 }
943
Johannes Berg723bae72010-01-25 13:36:36 +0100944 if (!started && !local->tmp_channel) {
Stanislaw Gruszka4fdbff02011-11-03 10:40:47 +0100945 bool on_oper_chan, on_oper_chan2;
Ben Greearda2fd1f2011-02-07 13:44:36 -0800946 enum nl80211_channel_type wk_ct;
Stanislaw Gruszka4fdbff02011-11-03 10:40:47 +0100947
Ben Greearb23b0252011-02-04 11:54:17 -0800948 on_oper_chan = ieee80211_cfg_on_oper_channel(local);
Ben Greearda2fd1f2011-02-07 13:44:36 -0800949
950 /* Work with existing channel type if possible. */
951 wk_ct = wk->chan_type;
952 if (wk->chan == local->hw.conf.channel)
953 wk_ct = ieee80211_calc_ct(wk->chan_type,
954 local->hw.conf.channel_type);
955
Johannes Berge4da8c32009-12-23 13:15:43 +0100956 local->tmp_channel = wk->chan;
Ben Greearda2fd1f2011-02-07 13:44:36 -0800957 local->tmp_channel_type = wk_ct;
Ben Greearb23b0252011-02-04 11:54:17 -0800958 /*
959 * Leave the station vifs in awake mode if they
960 * happen to be on the same channel as
961 * the requested channel.
962 */
963 on_oper_chan2 = ieee80211_cfg_on_oper_channel(local);
964 if (on_oper_chan != on_oper_chan2) {
965 if (on_oper_chan2) {
966 /* going off oper channel, PS too */
967 ieee80211_offchannel_stop_vifs(local,
968 true);
969 ieee80211_hw_config(local, 0);
970 } else {
971 /* going on channel, but leave PS
972 * off-channel. */
973 ieee80211_hw_config(local, 0);
974 ieee80211_offchannel_return(local,
975 true,
976 false);
977 }
Stanislaw Gruszka4fdbff02011-11-03 10:40:47 +0100978 }
Ben Greearb23b0252011-02-04 11:54:17 -0800979
Johannes Berg723bae72010-01-25 13:36:36 +0100980 started = true;
Johannes Berge4da8c32009-12-23 13:15:43 +0100981 wk->timeout = jiffies;
982 }
983
984 /* don't try to work with items that aren't started */
Johannes Berg723bae72010-01-25 13:36:36 +0100985 if (!started)
Johannes Berge4da8c32009-12-23 13:15:43 +0100986 continue;
987
Johannes Bergaf6b6372009-12-23 13:15:35 +0100988 if (time_is_after_jiffies(wk->timeout)) {
989 /*
990 * This work item isn't supposed to be worked on
991 * right now, but take care to adjust the timer
992 * properly.
993 */
994 run_again(local, wk->timeout);
995 continue;
996 }
997
998 switch (wk->type) {
999 default:
1000 WARN_ON(1);
1001 /* nothing */
1002 rma = WORK_ACT_NONE;
1003 break;
Johannes Bergb8bc4b02009-12-23 13:15:42 +01001004 case IEEE80211_WORK_ABORT:
1005 rma = WORK_ACT_TIMEOUT;
Juuso Oikarinen0e0a2282010-02-26 08:13:41 +02001006 break;
Johannes Bergaf6b6372009-12-23 13:15:35 +01001007 case IEEE80211_WORK_DIRECT_PROBE:
1008 rma = ieee80211_direct_probe(wk);
1009 break;
1010 case IEEE80211_WORK_AUTH:
1011 rma = ieee80211_authenticate(wk);
1012 break;
1013 case IEEE80211_WORK_ASSOC:
1014 rma = ieee80211_associate(wk);
1015 break;
Johannes Bergb8bc4b02009-12-23 13:15:42 +01001016 case IEEE80211_WORK_REMAIN_ON_CHANNEL:
1017 rma = ieee80211_remain_on_channel_timeout(wk);
1018 break;
Johannes Bergf30221e2010-11-25 10:02:30 +01001019 case IEEE80211_WORK_OFFCHANNEL_TX:
1020 rma = ieee80211_offchannel_tx(wk);
1021 break;
Johannes Berge5b900d2010-07-29 16:08:55 +02001022 case IEEE80211_WORK_ASSOC_BEACON_WAIT:
1023 rma = ieee80211_assoc_beacon_wait(wk);
1024 break;
Johannes Bergaf6b6372009-12-23 13:15:35 +01001025 }
1026
Johannes Berg723bae72010-01-25 13:36:36 +01001027 wk->started = started;
1028
Johannes Bergaf6b6372009-12-23 13:15:35 +01001029 switch (rma) {
1030 case WORK_ACT_NONE:
Johannes Berge4da8c32009-12-23 13:15:43 +01001031 /* might have changed the timeout */
1032 run_again(local, wk->timeout);
Johannes Bergaf6b6372009-12-23 13:15:35 +01001033 break;
1034 case WORK_ACT_TIMEOUT:
1035 list_del_rcu(&wk->list);
1036 synchronize_rcu();
1037 list_add(&wk->list, &free_work);
1038 break;
1039 default:
1040 WARN(1, "unexpected: %d", rma);
1041 }
1042 }
1043
Johannes Berge4da8c32009-12-23 13:15:43 +01001044 list_for_each_entry(wk, &local->work_list, list) {
1045 if (!wk->started)
1046 continue;
1047 if (wk->chan != local->tmp_channel)
1048 continue;
Eliad Pellereaa7af22011-10-20 19:05:49 +02001049 if (!ieee80211_work_ct_coexists(wk->chan_type,
1050 local->tmp_channel_type))
Johannes Berge4da8c32009-12-23 13:15:43 +01001051 continue;
1052 remain_off_channel = true;
1053 }
1054
1055 if (!remain_off_channel && local->tmp_channel) {
1056 local->tmp_channel = NULL;
Ben Greearb23b0252011-02-04 11:54:17 -08001057 /* If tmp_channel wasn't operating channel, then
1058 * we need to go back on-channel.
1059 * NOTE: If we can ever be here while scannning,
1060 * or if the hw_config() channel config logic changes,
1061 * then we may need to do a more thorough check to see if
1062 * we still need to do a hardware config. Currently,
1063 * we cannot be here while scanning, however.
1064 */
Eliad Peller6911bf02011-10-20 19:05:50 +02001065 if (!ieee80211_cfg_on_oper_channel(local))
Ben Greearb23b0252011-02-04 11:54:17 -08001066 ieee80211_hw_config(local, 0);
1067
1068 /* At the least, we need to disable offchannel_ps,
1069 * so just go ahead and run the entire offchannel
1070 * return logic here. We *could* skip enabling
1071 * beaconing if we were already on-oper-channel
1072 * as a future optimization.
1073 */
1074 ieee80211_offchannel_return(local, true, true);
1075
Johannes Berge4da8c32009-12-23 13:15:43 +01001076 /* give connection some time to breathe */
1077 run_again(local, jiffies + HZ/2);
1078 }
1079
Teemu Paasikivi68dd5b72010-04-09 13:07:55 +03001080 if (list_empty(&local->work_list) && local->scan_req &&
1081 !local->scanning)
Johannes Bergaf6b6372009-12-23 13:15:35 +01001082 ieee80211_queue_delayed_work(&local->hw,
1083 &local->scan_work,
1084 round_jiffies_relative(0));
1085
Johannes Berge4da8c32009-12-23 13:15:43 +01001086 ieee80211_recalc_idle(local);
1087
Johannes Berg7da7cc12010-08-05 17:02:38 +02001088 mutex_unlock(&local->mtx);
1089
Johannes Bergaf6b6372009-12-23 13:15:35 +01001090 list_for_each_entry_safe(wk, tmp, &free_work, list) {
1091 wk->done(wk, NULL);
1092 list_del(&wk->list);
1093 kfree(wk);
1094 }
1095}
1096
1097void ieee80211_add_work(struct ieee80211_work *wk)
1098{
1099 struct ieee80211_local *local;
1100
1101 if (WARN_ON(!wk->chan))
1102 return;
1103
1104 if (WARN_ON(!wk->sdata))
1105 return;
1106
1107 if (WARN_ON(!wk->done))
1108 return;
1109
Johannes Berg81ac3462010-01-06 15:30:58 +01001110 if (WARN_ON(!ieee80211_sdata_running(wk->sdata)))
1111 return;
1112
Johannes Berge4da8c32009-12-23 13:15:43 +01001113 wk->started = false;
Johannes Bergaf6b6372009-12-23 13:15:35 +01001114
1115 local = wk->sdata->local;
Johannes Berga1699b72010-07-30 16:46:07 +02001116 mutex_lock(&local->mtx);
Johannes Bergaf6b6372009-12-23 13:15:35 +01001117 list_add_tail(&wk->list, &local->work_list);
Johannes Berga1699b72010-07-30 16:46:07 +02001118 mutex_unlock(&local->mtx);
Johannes Bergaf6b6372009-12-23 13:15:35 +01001119
1120 ieee80211_queue_work(&local->hw, &local->work_work);
1121}
1122
1123void ieee80211_work_init(struct ieee80211_local *local)
1124{
Johannes Bergaf6b6372009-12-23 13:15:35 +01001125 INIT_LIST_HEAD(&local->work_list);
1126 setup_timer(&local->work_timer, ieee80211_work_timer,
1127 (unsigned long)local);
1128 INIT_WORK(&local->work_work, ieee80211_work_work);
1129 skb_queue_head_init(&local->work_skb_queue);
1130}
1131
1132void ieee80211_work_purge(struct ieee80211_sub_if_data *sdata)
1133{
1134 struct ieee80211_local *local = sdata->local;
Johannes Bergb8bc4b02009-12-23 13:15:42 +01001135 struct ieee80211_work *wk;
Herton Ronaldo Krzesinski8808f642010-12-13 11:43:51 -02001136 bool cleanup = false;
Johannes Bergaf6b6372009-12-23 13:15:35 +01001137
Johannes Berga1699b72010-07-30 16:46:07 +02001138 mutex_lock(&local->mtx);
Johannes Bergb8bc4b02009-12-23 13:15:42 +01001139 list_for_each_entry(wk, &local->work_list, list) {
Johannes Bergaf6b6372009-12-23 13:15:35 +01001140 if (wk->sdata != sdata)
1141 continue;
Herton Ronaldo Krzesinski8808f642010-12-13 11:43:51 -02001142 cleanup = true;
Johannes Bergb8bc4b02009-12-23 13:15:42 +01001143 wk->type = IEEE80211_WORK_ABORT;
Johannes Berge4da8c32009-12-23 13:15:43 +01001144 wk->started = true;
1145 wk->timeout = jiffies;
Johannes Bergb8bc4b02009-12-23 13:15:42 +01001146 }
Johannes Berga1699b72010-07-30 16:46:07 +02001147 mutex_unlock(&local->mtx);
Johannes Bergb8bc4b02009-12-23 13:15:42 +01001148
1149 /* run cleanups etc. */
Herton Ronaldo Krzesinski8808f642010-12-13 11:43:51 -02001150 if (cleanup)
1151 ieee80211_work_work(&local->work_work);
Johannes Bergb8bc4b02009-12-23 13:15:42 +01001152
Johannes Berga1699b72010-07-30 16:46:07 +02001153 mutex_lock(&local->mtx);
Johannes Bergb8bc4b02009-12-23 13:15:42 +01001154 list_for_each_entry(wk, &local->work_list, list) {
1155 if (wk->sdata != sdata)
1156 continue;
1157 WARN_ON(1);
1158 break;
Johannes Bergaf6b6372009-12-23 13:15:35 +01001159 }
Johannes Berga1699b72010-07-30 16:46:07 +02001160 mutex_unlock(&local->mtx);
Johannes Bergaf6b6372009-12-23 13:15:35 +01001161}
1162
1163ieee80211_rx_result ieee80211_work_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1164 struct sk_buff *skb)
1165{
1166 struct ieee80211_local *local = sdata->local;
1167 struct ieee80211_mgmt *mgmt;
1168 struct ieee80211_work *wk;
1169 u16 fc;
1170
1171 if (skb->len < 24)
1172 return RX_DROP_MONITOR;
1173
1174 mgmt = (struct ieee80211_mgmt *) skb->data;
1175 fc = le16_to_cpu(mgmt->frame_control);
1176
1177 list_for_each_entry_rcu(wk, &local->work_list, list) {
1178 if (sdata != wk->sdata)
1179 continue;
1180 if (compare_ether_addr(wk->filter_ta, mgmt->sa))
1181 continue;
1182 if (compare_ether_addr(wk->filter_ta, mgmt->bssid))
1183 continue;
1184
1185 switch (fc & IEEE80211_FCTL_STYPE) {
1186 case IEEE80211_STYPE_AUTH:
1187 case IEEE80211_STYPE_PROBE_RESP:
1188 case IEEE80211_STYPE_ASSOC_RESP:
1189 case IEEE80211_STYPE_REASSOC_RESP:
Johannes Berge5b900d2010-07-29 16:08:55 +02001190 case IEEE80211_STYPE_BEACON:
Johannes Bergaf6b6372009-12-23 13:15:35 +01001191 skb_queue_tail(&local->work_skb_queue, skb);
1192 ieee80211_queue_work(&local->hw, &local->work_work);
1193 return RX_QUEUED;
1194 }
1195 }
1196
1197 return RX_CONTINUE;
1198}
Johannes Bergb8bc4b02009-12-23 13:15:42 +01001199
Johannes Berge4da8c32009-12-23 13:15:43 +01001200static enum work_done_result ieee80211_remain_done(struct ieee80211_work *wk,
1201 struct sk_buff *skb)
1202{
1203 /*
1204 * We are done serving the remain-on-channel command.
1205 */
Kalle Valo1990ca62009-12-30 14:42:20 +02001206 cfg80211_remain_on_channel_expired(wk->sdata->dev, (unsigned long) wk,
Johannes Berge4da8c32009-12-23 13:15:43 +01001207 wk->chan, wk->chan_type,
1208 GFP_KERNEL);
1209
1210 return WORK_DONE_DESTROY;
1211}
1212
Johannes Bergb8bc4b02009-12-23 13:15:42 +01001213int ieee80211_wk_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1214 struct ieee80211_channel *chan,
1215 enum nl80211_channel_type channel_type,
1216 unsigned int duration, u64 *cookie)
1217{
Johannes Bergb8bc4b02009-12-23 13:15:42 +01001218 struct ieee80211_work *wk;
1219
1220 wk = kzalloc(sizeof(*wk), GFP_KERNEL);
1221 if (!wk)
1222 return -ENOMEM;
1223
1224 wk->type = IEEE80211_WORK_REMAIN_ON_CHANNEL;
1225 wk->chan = chan;
Johannes Berge4da8c32009-12-23 13:15:43 +01001226 wk->chan_type = channel_type;
Johannes Bergb8bc4b02009-12-23 13:15:42 +01001227 wk->sdata = sdata;
Johannes Berge4da8c32009-12-23 13:15:43 +01001228 wk->done = ieee80211_remain_done;
Johannes Bergb8bc4b02009-12-23 13:15:42 +01001229
Johannes Berge4da8c32009-12-23 13:15:43 +01001230 wk->remain.duration = duration;
Johannes Bergb8bc4b02009-12-23 13:15:42 +01001231
Kalle Valo1990ca62009-12-30 14:42:20 +02001232 *cookie = (unsigned long) wk;
Johannes Bergb8bc4b02009-12-23 13:15:42 +01001233
1234 ieee80211_add_work(wk);
1235
Johannes Bergb8bc4b02009-12-23 13:15:42 +01001236 return 0;
1237}
1238
1239int ieee80211_wk_cancel_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1240 u64 cookie)
1241{
1242 struct ieee80211_local *local = sdata->local;
1243 struct ieee80211_work *wk, *tmp;
1244 bool found = false;
1245
Johannes Berga1699b72010-07-30 16:46:07 +02001246 mutex_lock(&local->mtx);
Johannes Bergb8bc4b02009-12-23 13:15:42 +01001247 list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
Kalle Valo1990ca62009-12-30 14:42:20 +02001248 if ((unsigned long) wk == cookie) {
Johannes Berge4da8c32009-12-23 13:15:43 +01001249 wk->timeout = jiffies;
Johannes Bergb8bc4b02009-12-23 13:15:42 +01001250 found = true;
Johannes Bergb8bc4b02009-12-23 13:15:42 +01001251 break;
1252 }
1253 }
Johannes Berga1699b72010-07-30 16:46:07 +02001254 mutex_unlock(&local->mtx);
Johannes Bergb8bc4b02009-12-23 13:15:42 +01001255
1256 if (!found)
1257 return -ENOENT;
1258
Johannes Berge4da8c32009-12-23 13:15:43 +01001259 ieee80211_queue_work(&local->hw, &local->work_work);
Johannes Bergb8bc4b02009-12-23 13:15:42 +01001260
1261 return 0;
1262}