1 /*
2 * BSS client mode implementation
3 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/wireless.h>
19 #include <linux/random.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rtnetlink.h>
22 #include <net/iw_handler.h>
23 #include <net/mac80211.h>
24 #include <asm/unaligned.h>
25
26 #include "ieee80211_i.h"
27 #include "rate.h"
28 #include "led.h"
29
30 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
31 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
32 #define IEEE80211_AUTH_MAX_TRIES 3
33 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
34 #define IEEE80211_ASSOC_MAX_TRIES 3
35 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
36 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
37 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
38 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
39 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
40 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
41
42 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
43 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
44
45 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
46
47
48 /* utils */
ecw2cw(int ecw)49 static int ecw2cw(int ecw)
50 {
51 return (1 << ecw) - 1;
52 }
53
ieee80211_bss_get_ie(struct ieee80211_bss * bss,u8 ie)54 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
55 {
56 u8 *end, *pos;
57
58 pos = bss->ies;
59 if (pos == NULL)
60 return NULL;
61 end = pos + bss->ies_len;
62
63 while (pos + 1 < end) {
64 if (pos + 2 + pos[1] > end)
65 break;
66 if (pos[0] == ie)
67 return pos;
68 pos += 2 + pos[1];
69 }
70
71 return NULL;
72 }
73
ieee80211_compatible_rates(struct ieee80211_bss * bss,struct ieee80211_supported_band * sband,u64 * rates)74 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
75 struct ieee80211_supported_band *sband,
76 u64 *rates)
77 {
78 int i, j, count;
79 *rates = 0;
80 count = 0;
81 for (i = 0; i < bss->supp_rates_len; i++) {
82 int rate = (bss->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 /* also used by mesh code */
ieee80211_sta_get_rates(struct ieee80211_local * local,struct ieee802_11_elems * elems,enum ieee80211_band band)96 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
97 struct ieee802_11_elems *elems,
98 enum ieee80211_band band)
99 {
100 struct ieee80211_supported_band *sband;
101 struct ieee80211_rate *bitrates;
102 size_t num_rates;
103 u64 supp_rates;
104 int i, j;
105 sband = local->hw.wiphy->bands[band];
106
107 if (!sband) {
108 WARN_ON(1);
109 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
110 }
111
112 bitrates = sband->bitrates;
113 num_rates = sband->n_bitrates;
114 supp_rates = 0;
115 for (i = 0; i < elems->supp_rates_len +
116 elems->ext_supp_rates_len; i++) {
117 u8 rate = 0;
118 int own_rate;
119 if (i < elems->supp_rates_len)
120 rate = elems->supp_rates[i];
121 else if (elems->ext_supp_rates)
122 rate = elems->ext_supp_rates
123 [i - elems->supp_rates_len];
124 own_rate = 5 * (rate & 0x7f);
125 for (j = 0; j < num_rates; j++)
126 if (bitrates[j].bitrate == own_rate)
127 supp_rates |= BIT(j);
128 }
129 return supp_rates;
130 }
131
132 /* frame sending functions */
133
134 /* also used by scanning code */
ieee80211_send_probe_req(struct ieee80211_sub_if_data * sdata,u8 * dst,u8 * ssid,size_t ssid_len)135 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
136 u8 *ssid, size_t ssid_len)
137 {
138 struct ieee80211_local *local = sdata->local;
139 struct ieee80211_supported_band *sband;
140 struct sk_buff *skb;
141 struct ieee80211_mgmt *mgmt;
142 u8 *pos, *supp_rates, *esupp_rates = NULL;
143 int i;
144
145 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
146 if (!skb) {
147 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
148 "request\n", sdata->dev->name);
149 return;
150 }
151 skb_reserve(skb, local->hw.extra_tx_headroom);
152
153 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
154 memset(mgmt, 0, 24);
155 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
156 IEEE80211_STYPE_PROBE_REQ);
157 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
158 if (dst) {
159 memcpy(mgmt->da, dst, ETH_ALEN);
160 memcpy(mgmt->bssid, dst, ETH_ALEN);
161 } else {
162 memset(mgmt->da, 0xff, ETH_ALEN);
163 memset(mgmt->bssid, 0xff, ETH_ALEN);
164 }
165 pos = skb_put(skb, 2 + ssid_len);
166 *pos++ = WLAN_EID_SSID;
167 *pos++ = ssid_len;
168 memcpy(pos, ssid, ssid_len);
169
170 supp_rates = skb_put(skb, 2);
171 supp_rates[0] = WLAN_EID_SUPP_RATES;
172 supp_rates[1] = 0;
173 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
174
175 for (i = 0; i < sband->n_bitrates; i++) {
176 struct ieee80211_rate *rate = &sband->bitrates[i];
177 if (esupp_rates) {
178 pos = skb_put(skb, 1);
179 esupp_rates[1]++;
180 } else if (supp_rates[1] == 8) {
181 esupp_rates = skb_put(skb, 3);
182 esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
183 esupp_rates[1] = 1;
184 pos = &esupp_rates[2];
185 } else {
186 pos = skb_put(skb, 1);
187 supp_rates[1]++;
188 }
189 *pos = rate->bitrate / 5;
190 }
191
192 ieee80211_tx_skb(sdata, skb, 0);
193 }
194
ieee80211_send_auth(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta,int transaction,u8 * extra,size_t extra_len,int encrypt)195 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
196 struct ieee80211_if_sta *ifsta,
197 int transaction, u8 *extra, size_t extra_len,
198 int encrypt)
199 {
200 struct ieee80211_local *local = sdata->local;
201 struct sk_buff *skb;
202 struct ieee80211_mgmt *mgmt;
203
204 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
205 sizeof(*mgmt) + 6 + extra_len);
206 if (!skb) {
207 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
208 "frame\n", sdata->dev->name);
209 return;
210 }
211 skb_reserve(skb, local->hw.extra_tx_headroom);
212
213 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
214 memset(mgmt, 0, 24 + 6);
215 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
216 IEEE80211_STYPE_AUTH);
217 if (encrypt)
218 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
219 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
220 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
221 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
222 mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
223 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
224 ifsta->auth_transaction = transaction + 1;
225 mgmt->u.auth.status_code = cpu_to_le16(0);
226 if (extra)
227 memcpy(skb_put(skb, extra_len), extra, extra_len);
228
229 ieee80211_tx_skb(sdata, skb, encrypt);
230 }
231
ieee80211_send_assoc(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta)232 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
233 struct ieee80211_if_sta *ifsta)
234 {
235 struct ieee80211_local *local = sdata->local;
236 struct sk_buff *skb;
237 struct ieee80211_mgmt *mgmt;
238 u8 *pos, *ies, *ht_ie;
239 int i, len, count, rates_len, supp_rates_len;
240 u16 capab;
241 struct ieee80211_bss *bss;
242 int wmm = 0;
243 struct ieee80211_supported_band *sband;
244 u64 rates = 0;
245
246 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
247 sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
248 ifsta->ssid_len);
249 if (!skb) {
250 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
251 "frame\n", sdata->dev->name);
252 return;
253 }
254 skb_reserve(skb, local->hw.extra_tx_headroom);
255
256 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
257
258 capab = ifsta->capab;
259
260 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
261 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
262 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
263 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
264 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
265 }
266
267 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
268 local->hw.conf.channel->center_freq,
269 ifsta->ssid, ifsta->ssid_len);
270 if (bss) {
271 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
272 capab |= WLAN_CAPABILITY_PRIVACY;
273 if (bss->wmm_used)
274 wmm = 1;
275
276 /* get all rates supported by the device and the AP as
277 * some APs don't like getting a superset of their rates
278 * in the association request (e.g. D-Link DAP 1353 in
279 * b-only mode) */
280 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
281
282 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
283 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
284 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
285
286 ieee80211_rx_bss_put(local, bss);
287 } else {
288 rates = ~0;
289 rates_len = sband->n_bitrates;
290 }
291
292 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
293 memset(mgmt, 0, 24);
294 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
295 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
296 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
297
298 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
299 skb_put(skb, 10);
300 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
301 IEEE80211_STYPE_REASSOC_REQ);
302 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
303 mgmt->u.reassoc_req.listen_interval =
304 cpu_to_le16(local->hw.conf.listen_interval);
305 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
306 ETH_ALEN);
307 } else {
308 skb_put(skb, 4);
309 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
310 IEEE80211_STYPE_ASSOC_REQ);
311 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
312 mgmt->u.assoc_req.listen_interval =
313 cpu_to_le16(local->hw.conf.listen_interval);
314 }
315
316 /* SSID */
317 ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
318 *pos++ = WLAN_EID_SSID;
319 *pos++ = ifsta->ssid_len;
320 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
321
322 /* add all rates which were marked to be used above */
323 supp_rates_len = rates_len;
324 if (supp_rates_len > 8)
325 supp_rates_len = 8;
326
327 len = sband->n_bitrates;
328 pos = skb_put(skb, supp_rates_len + 2);
329 *pos++ = WLAN_EID_SUPP_RATES;
330 *pos++ = supp_rates_len;
331
332 count = 0;
333 for (i = 0; i < sband->n_bitrates; i++) {
334 if (BIT(i) & rates) {
335 int rate = sband->bitrates[i].bitrate;
336 *pos++ = (u8) (rate / 5);
337 if (++count == 8)
338 break;
339 }
340 }
341
342 if (rates_len > count) {
343 pos = skb_put(skb, rates_len - count + 2);
344 *pos++ = WLAN_EID_EXT_SUPP_RATES;
345 *pos++ = rates_len - count;
346
347 for (i++; i < sband->n_bitrates; i++) {
348 if (BIT(i) & rates) {
349 int rate = sband->bitrates[i].bitrate;
350 *pos++ = (u8) (rate / 5);
351 }
352 }
353 }
354
355 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
356 /* 1. power capabilities */
357 pos = skb_put(skb, 4);
358 *pos++ = WLAN_EID_PWR_CAPABILITY;
359 *pos++ = 2;
360 *pos++ = 0; /* min tx power */
361 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
362
363 /* 2. supported channels */
364 /* TODO: get this in reg domain format */
365 pos = skb_put(skb, 2 * sband->n_channels + 2);
366 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
367 *pos++ = 2 * sband->n_channels;
368 for (i = 0; i < sband->n_channels; i++) {
369 *pos++ = ieee80211_frequency_to_channel(
370 sband->channels[i].center_freq);
371 *pos++ = 1; /* one channel in the subband*/
372 }
373 }
374
375 if (ifsta->extra_ie) {
376 pos = skb_put(skb, ifsta->extra_ie_len);
377 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
378 }
379
380 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
381 pos = skb_put(skb, 9);
382 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
383 *pos++ = 7; /* len */
384 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
385 *pos++ = 0x50;
386 *pos++ = 0xf2;
387 *pos++ = 2; /* WME */
388 *pos++ = 0; /* WME info */
389 *pos++ = 1; /* WME ver */
390 *pos++ = 0;
391 }
392
393 /* wmm support is a must to HT */
394 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
395 sband->ht_cap.ht_supported &&
396 (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
397 ht_ie[1] >= sizeof(struct ieee80211_ht_info)) {
398 struct ieee80211_ht_info *ht_info =
399 (struct ieee80211_ht_info *)(ht_ie + 2);
400 u16 cap = sband->ht_cap.cap;
401 __le16 tmp;
402 u32 flags = local->hw.conf.channel->flags;
403
404 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
405 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
406 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
407 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
408 cap &= ~IEEE80211_HT_CAP_SGI_40;
409 }
410 break;
411 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
412 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
413 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
414 cap &= ~IEEE80211_HT_CAP_SGI_40;
415 }
416 break;
417 }
418
419 tmp = cpu_to_le16(cap);
420 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
421 *pos++ = WLAN_EID_HT_CAPABILITY;
422 *pos++ = sizeof(struct ieee80211_ht_cap);
423 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
424 memcpy(pos, &tmp, sizeof(u16));
425 pos += sizeof(u16);
426 /* TODO: needs a define here for << 2 */
427 *pos++ = sband->ht_cap.ampdu_factor |
428 (sband->ht_cap.ampdu_density << 2);
429 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
430 }
431
432 kfree(ifsta->assocreq_ies);
433 ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
434 ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
435 if (ifsta->assocreq_ies)
436 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
437
438 ieee80211_tx_skb(sdata, skb, 0);
439 }
440
441
ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data * sdata,u16 stype,u16 reason)442 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
443 u16 stype, u16 reason)
444 {
445 struct ieee80211_local *local = sdata->local;
446 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
447 struct sk_buff *skb;
448 struct ieee80211_mgmt *mgmt;
449
450 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
451 if (!skb) {
452 printk(KERN_DEBUG "%s: failed to allocate buffer for "
453 "deauth/disassoc frame\n", sdata->dev->name);
454 return;
455 }
456 skb_reserve(skb, local->hw.extra_tx_headroom);
457
458 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
459 memset(mgmt, 0, 24);
460 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
461 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
462 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
463 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
464 skb_put(skb, 2);
465 /* u.deauth.reason_code == u.disassoc.reason_code */
466 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
467
468 ieee80211_tx_skb(sdata, skb, 0);
469 }
470
471 /* MLME */
ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data * sdata,struct ieee80211_bss * bss)472 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
473 struct ieee80211_bss *bss)
474 {
475 struct ieee80211_local *local = sdata->local;
476 int i, have_higher_than_11mbit = 0;
477
478 /* cf. IEEE 802.11 9.2.12 */
479 for (i = 0; i < bss->supp_rates_len; i++)
480 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
481 have_higher_than_11mbit = 1;
482
483 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
484 have_higher_than_11mbit)
485 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
486 else
487 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
488
489 ieee80211_set_wmm_default(sdata);
490 }
491
ieee80211_sta_wmm_params(struct ieee80211_local * local,struct ieee80211_if_sta * ifsta,u8 * wmm_param,size_t wmm_param_len)492 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
493 struct ieee80211_if_sta *ifsta,
494 u8 *wmm_param, size_t wmm_param_len)
495 {
496 struct ieee80211_tx_queue_params params;
497 size_t left;
498 int count;
499 u8 *pos;
500
501 if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
502 return;
503
504 if (!wmm_param)
505 return;
506
507 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
508 return;
509 count = wmm_param[6] & 0x0f;
510 if (count == ifsta->wmm_last_param_set)
511 return;
512 ifsta->wmm_last_param_set = count;
513
514 pos = wmm_param + 8;
515 left = wmm_param_len - 8;
516
517 memset(¶ms, 0, sizeof(params));
518
519 if (!local->ops->conf_tx)
520 return;
521
522 local->wmm_acm = 0;
523 for (; left >= 4; left -= 4, pos += 4) {
524 int aci = (pos[0] >> 5) & 0x03;
525 int acm = (pos[0] >> 4) & 0x01;
526 int queue;
527
528 switch (aci) {
529 case 1:
530 queue = 3;
531 if (acm)
532 local->wmm_acm |= BIT(0) | BIT(3);
533 break;
534 case 2:
535 queue = 1;
536 if (acm)
537 local->wmm_acm |= BIT(4) | BIT(5);
538 break;
539 case 3:
540 queue = 0;
541 if (acm)
542 local->wmm_acm |= BIT(6) | BIT(7);
543 break;
544 case 0:
545 default:
546 queue = 2;
547 if (acm)
548 local->wmm_acm |= BIT(1) | BIT(2);
549 break;
550 }
551
552 params.aifs = pos[0] & 0x0f;
553 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
554 params.cw_min = ecw2cw(pos[1] & 0x0f);
555 params.txop = get_unaligned_le16(pos + 2);
556 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
557 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
558 "cWmin=%d cWmax=%d txop=%d\n",
559 local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
560 params.cw_max, params.txop);
561 #endif
562 /* TODO: handle ACM (block TX, fallback to next lowest allowed
563 * AC for now) */
564 if (local->ops->conf_tx(local_to_hw(local), queue, ¶ms)) {
565 printk(KERN_DEBUG "%s: failed to set TX queue "
566 "parameters for queue %d\n", local->mdev->name, queue);
567 }
568 }
569 }
570
ieee80211_handle_bss_capability(struct ieee80211_sub_if_data * sdata,u16 capab,bool erp_valid,u8 erp)571 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
572 u16 capab, bool erp_valid, u8 erp)
573 {
574 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
575 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
576 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
577 #endif
578 u32 changed = 0;
579 bool use_protection;
580 bool use_short_preamble;
581 bool use_short_slot;
582
583 if (erp_valid) {
584 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
585 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
586 } else {
587 use_protection = false;
588 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
589 }
590
591 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
592
593 if (use_protection != bss_conf->use_cts_prot) {
594 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
595 if (net_ratelimit()) {
596 printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
597 sdata->dev->name,
598 use_protection ? "enabled" : "disabled",
599 ifsta->bssid);
600 }
601 #endif
602 bss_conf->use_cts_prot = use_protection;
603 changed |= BSS_CHANGED_ERP_CTS_PROT;
604 }
605
606 if (use_short_preamble != bss_conf->use_short_preamble) {
607 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
608 if (net_ratelimit()) {
609 printk(KERN_DEBUG "%s: switched to %s barker preamble"
610 " (BSSID=%pM)\n",
611 sdata->dev->name,
612 use_short_preamble ? "short" : "long",
613 ifsta->bssid);
614 }
615 #endif
616 bss_conf->use_short_preamble = use_short_preamble;
617 changed |= BSS_CHANGED_ERP_PREAMBLE;
618 }
619
620 if (use_short_slot != bss_conf->use_short_slot) {
621 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
622 if (net_ratelimit()) {
623 printk(KERN_DEBUG "%s: switched to %s slot time"
624 " (BSSID=%pM)\n",
625 sdata->dev->name,
626 use_short_slot ? "short" : "long",
627 ifsta->bssid);
628 }
629 #endif
630 bss_conf->use_short_slot = use_short_slot;
631 changed |= BSS_CHANGED_ERP_SLOT;
632 }
633
634 return changed;
635 }
636
ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta)637 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
638 struct ieee80211_if_sta *ifsta)
639 {
640 union iwreq_data wrqu;
641 memset(&wrqu, 0, sizeof(wrqu));
642 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
643 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
644 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
645 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
646 }
647
ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta)648 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
649 struct ieee80211_if_sta *ifsta)
650 {
651 char *buf;
652 size_t len;
653 int i;
654 union iwreq_data wrqu;
655
656 if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
657 return;
658
659 buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
660 ifsta->assocresp_ies_len), GFP_KERNEL);
661 if (!buf)
662 return;
663
664 len = sprintf(buf, "ASSOCINFO(");
665 if (ifsta->assocreq_ies) {
666 len += sprintf(buf + len, "ReqIEs=");
667 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
668 len += sprintf(buf + len, "%02x",
669 ifsta->assocreq_ies[i]);
670 }
671 }
672 if (ifsta->assocresp_ies) {
673 if (ifsta->assocreq_ies)
674 len += sprintf(buf + len, " ");
675 len += sprintf(buf + len, "RespIEs=");
676 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
677 len += sprintf(buf + len, "%02x",
678 ifsta->assocresp_ies[i]);
679 }
680 }
681 len += sprintf(buf + len, ")");
682
683 if (len > IW_CUSTOM_MAX) {
684 len = sprintf(buf, "ASSOCRESPIE=");
685 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
686 len += sprintf(buf + len, "%02x",
687 ifsta->assocresp_ies[i]);
688 }
689 }
690
691 if (len <= IW_CUSTOM_MAX) {
692 memset(&wrqu, 0, sizeof(wrqu));
693 wrqu.data.length = len;
694 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
695 }
696
697 kfree(buf);
698 }
699
700
ieee80211_set_associated(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta,u32 bss_info_changed)701 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
702 struct ieee80211_if_sta *ifsta,
703 u32 bss_info_changed)
704 {
705 struct ieee80211_local *local = sdata->local;
706 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
707
708 struct ieee80211_bss *bss;
709
710 bss_info_changed |= BSS_CHANGED_ASSOC;
711 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
712
713 if (sdata->vif.type != NL80211_IFTYPE_STATION)
714 return;
715
716 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
717 conf->channel->center_freq,
718 ifsta->ssid, ifsta->ssid_len);
719 if (bss) {
720 /* set timing information */
721 sdata->vif.bss_conf.beacon_int = bss->beacon_int;
722 sdata->vif.bss_conf.timestamp = bss->timestamp;
723 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
724
725 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
726 bss->capability, bss->has_erp_value, bss->erp_value);
727
728 ieee80211_rx_bss_put(local, bss);
729 }
730
731 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
732 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
733 ieee80211_sta_send_associnfo(sdata, ifsta);
734
735 ifsta->last_probe = jiffies;
736 ieee80211_led_assoc(local, 1);
737
738 sdata->vif.bss_conf.assoc = 1;
739 /*
740 * For now just always ask the driver to update the basic rateset
741 * when we have associated, we aren't checking whether it actually
742 * changed or not.
743 */
744 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
745 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
746
747 if (local->powersave) {
748 if (local->dynamic_ps_timeout > 0)
749 mod_timer(&local->dynamic_ps_timer, jiffies +
750 msecs_to_jiffies(local->dynamic_ps_timeout));
751 else {
752 conf->flags |= IEEE80211_CONF_PS;
753 ieee80211_hw_config(local,
754 IEEE80211_CONF_CHANGE_PS);
755 }
756 }
757
758 netif_tx_start_all_queues(sdata->dev);
759 netif_carrier_on(sdata->dev);
760
761 ieee80211_sta_send_apinfo(sdata, ifsta);
762 }
763
ieee80211_direct_probe(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta)764 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
765 struct ieee80211_if_sta *ifsta)
766 {
767 ifsta->direct_probe_tries++;
768 if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
769 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
770 sdata->dev->name, ifsta->bssid);
771 ifsta->state = IEEE80211_STA_MLME_DISABLED;
772 ieee80211_sta_send_apinfo(sdata, ifsta);
773 return;
774 }
775
776 printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
777 sdata->dev->name, ifsta->bssid,
778 ifsta->direct_probe_tries);
779
780 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
781
782 set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
783
784 /* Direct probe is sent to broadcast address as some APs
785 * will not answer to direct packet in unassociated state.
786 */
787 ieee80211_send_probe_req(sdata, NULL,
788 ifsta->ssid, ifsta->ssid_len);
789
790 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
791 }
792
793
ieee80211_authenticate(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta)794 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
795 struct ieee80211_if_sta *ifsta)
796 {
797 ifsta->auth_tries++;
798 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
799 printk(KERN_DEBUG "%s: authentication with AP %pM"
800 " timed out\n",
801 sdata->dev->name, ifsta->bssid);
802 ifsta->state = IEEE80211_STA_MLME_DISABLED;
803 ieee80211_sta_send_apinfo(sdata, ifsta);
804 return;
805 }
806
807 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
808 printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
809 sdata->dev->name, ifsta->bssid);
810
811 ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
812
813 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
814 }
815
816 /*
817 * The disassoc 'reason' argument can be either our own reason
818 * if self disconnected or a reason code from the AP.
819 */
ieee80211_set_disassoc(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta,bool deauth,bool self_disconnected,u16 reason)820 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
821 struct ieee80211_if_sta *ifsta, bool deauth,
822 bool self_disconnected, u16 reason)
823 {
824 struct ieee80211_local *local = sdata->local;
825 struct sta_info *sta;
826 u32 changed = 0, config_changed = 0;
827
828 rcu_read_lock();
829
830 sta = sta_info_get(local, ifsta->bssid);
831 if (!sta) {
832 rcu_read_unlock();
833 return;
834 }
835
836 if (deauth) {
837 ifsta->direct_probe_tries = 0;
838 ifsta->auth_tries = 0;
839 }
840 ifsta->assoc_scan_tries = 0;
841 ifsta->assoc_tries = 0;
842
843 netif_tx_stop_all_queues(sdata->dev);
844 netif_carrier_off(sdata->dev);
845
846 ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
847
848 if (self_disconnected) {
849 if (deauth)
850 ieee80211_send_deauth_disassoc(sdata,
851 IEEE80211_STYPE_DEAUTH, reason);
852 else
853 ieee80211_send_deauth_disassoc(sdata,
854 IEEE80211_STYPE_DISASSOC, reason);
855 }
856
857 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
858 changed |= ieee80211_reset_erp_info(sdata);
859
860 ieee80211_led_assoc(local, 0);
861 changed |= BSS_CHANGED_ASSOC;
862 sdata->vif.bss_conf.assoc = false;
863
864 ieee80211_sta_send_apinfo(sdata, ifsta);
865
866 if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT)
867 ifsta->state = IEEE80211_STA_MLME_DISABLED;
868
869 rcu_read_unlock();
870
871 local->hw.conf.ht.enabled = false;
872 local->oper_channel_type = NL80211_CHAN_NO_HT;
873 config_changed |= IEEE80211_CONF_CHANGE_HT;
874
875 del_timer_sync(&local->dynamic_ps_timer);
876 cancel_work_sync(&local->dynamic_ps_enable_work);
877
878 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
879 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
880 config_changed |= IEEE80211_CONF_CHANGE_PS;
881 }
882
883 ieee80211_hw_config(local, config_changed);
884 ieee80211_bss_info_change_notify(sdata, changed);
885
886 rcu_read_lock();
887
888 sta = sta_info_get(local, ifsta->bssid);
889 if (!sta) {
890 rcu_read_unlock();
891 return;
892 }
893
894 sta_info_unlink(&sta);
895
896 rcu_read_unlock();
897
898 sta_info_destroy(sta);
899 }
900
ieee80211_sta_wep_configured(struct ieee80211_sub_if_data * sdata)901 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
902 {
903 if (!sdata || !sdata->default_key ||
904 sdata->default_key->conf.alg != ALG_WEP)
905 return 0;
906 return 1;
907 }
908
ieee80211_privacy_mismatch(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta)909 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
910 struct ieee80211_if_sta *ifsta)
911 {
912 struct ieee80211_local *local = sdata->local;
913 struct ieee80211_bss *bss;
914 int bss_privacy;
915 int wep_privacy;
916 int privacy_invoked;
917
918 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
919 return 0;
920
921 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
922 local->hw.conf.channel->center_freq,
923 ifsta->ssid, ifsta->ssid_len);
924 if (!bss)
925 return 0;
926
927 bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
928 wep_privacy = !!ieee80211_sta_wep_configured(sdata);
929 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
930
931 ieee80211_rx_bss_put(local, bss);
932
933 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
934 return 0;
935
936 return 1;
937 }
938
ieee80211_associate(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta)939 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
940 struct ieee80211_if_sta *ifsta)
941 {
942 ifsta->assoc_tries++;
943 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
944 printk(KERN_DEBUG "%s: association with AP %pM"
945 " timed out\n",
946 sdata->dev->name, ifsta->bssid);
947 ifsta->state = IEEE80211_STA_MLME_DISABLED;
948 ieee80211_sta_send_apinfo(sdata, ifsta);
949 return;
950 }
951
952 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
953 printk(KERN_DEBUG "%s: associate with AP %pM\n",
954 sdata->dev->name, ifsta->bssid);
955 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
956 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
957 "mixed-cell disabled - abort association\n", sdata->dev->name);
958 ifsta->state = IEEE80211_STA_MLME_DISABLED;
959 return;
960 }
961
962 ieee80211_send_assoc(sdata, ifsta);
963
964 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
965 }
966
967
ieee80211_associated(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta)968 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
969 struct ieee80211_if_sta *ifsta)
970 {
971 struct ieee80211_local *local = sdata->local;
972 struct sta_info *sta;
973 int disassoc;
974
975 /* TODO: start monitoring current AP signal quality and number of
976 * missed beacons. Scan other channels every now and then and search
977 * for better APs. */
978 /* TODO: remove expired BSSes */
979
980 ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
981
982 rcu_read_lock();
983
984 sta = sta_info_get(local, ifsta->bssid);
985 if (!sta) {
986 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
987 sdata->dev->name, ifsta->bssid);
988 disassoc = 1;
989 } else {
990 disassoc = 0;
991 if (time_after(jiffies,
992 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
993 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
994 printk(KERN_DEBUG "%s: No ProbeResp from "
995 "current AP %pM - assume out of "
996 "range\n",
997 sdata->dev->name, ifsta->bssid);
998 disassoc = 1;
999 } else
1000 ieee80211_send_probe_req(sdata, ifsta->bssid,
1001 ifsta->ssid,
1002 ifsta->ssid_len);
1003 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1004 } else {
1005 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1006 if (time_after(jiffies, ifsta->last_probe +
1007 IEEE80211_PROBE_INTERVAL)) {
1008 ifsta->last_probe = jiffies;
1009 ieee80211_send_probe_req(sdata, ifsta->bssid,
1010 ifsta->ssid,
1011 ifsta->ssid_len);
1012 }
1013 }
1014 }
1015
1016 rcu_read_unlock();
1017
1018 if (disassoc)
1019 ieee80211_set_disassoc(sdata, ifsta, true, true,
1020 WLAN_REASON_PREV_AUTH_NOT_VALID);
1021 else
1022 mod_timer(&ifsta->timer, jiffies +
1023 IEEE80211_MONITORING_INTERVAL);
1024 }
1025
1026
ieee80211_auth_completed(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta)1027 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1028 struct ieee80211_if_sta *ifsta)
1029 {
1030 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1031 ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1032 ieee80211_associate(sdata, ifsta);
1033 }
1034
1035
ieee80211_auth_challenge(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta,struct ieee80211_mgmt * mgmt,size_t len)1036 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1037 struct ieee80211_if_sta *ifsta,
1038 struct ieee80211_mgmt *mgmt,
1039 size_t len)
1040 {
1041 u8 *pos;
1042 struct ieee802_11_elems elems;
1043
1044 pos = mgmt->u.auth.variable;
1045 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1046 if (!elems.challenge)
1047 return;
1048 ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1049 elems.challenge_len + 2, 1);
1050 }
1051
ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta,struct ieee80211_mgmt * mgmt,size_t len)1052 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1053 struct ieee80211_if_sta *ifsta,
1054 struct ieee80211_mgmt *mgmt,
1055 size_t len)
1056 {
1057 u16 auth_alg, auth_transaction, status_code;
1058
1059 if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1060 sdata->vif.type != NL80211_IFTYPE_ADHOC)
1061 return;
1062
1063 if (len < 24 + 6)
1064 return;
1065
1066 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1067 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1068 return;
1069
1070 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1071 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1072 return;
1073
1074 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1075 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1076 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1077
1078 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1079 /*
1080 * IEEE 802.11 standard does not require authentication in IBSS
1081 * networks and most implementations do not seem to use it.
1082 * However, try to reply to authentication attempts if someone
1083 * has actually implemented this.
1084 */
1085 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1086 return;
1087 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1088 }
1089
1090 if (auth_alg != ifsta->auth_alg ||
1091 auth_transaction != ifsta->auth_transaction)
1092 return;
1093
1094 if (status_code != WLAN_STATUS_SUCCESS) {
1095 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1096 u8 algs[3];
1097 const int num_algs = ARRAY_SIZE(algs);
1098 int i, pos;
1099 algs[0] = algs[1] = algs[2] = 0xff;
1100 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1101 algs[0] = WLAN_AUTH_OPEN;
1102 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1103 algs[1] = WLAN_AUTH_SHARED_KEY;
1104 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1105 algs[2] = WLAN_AUTH_LEAP;
1106 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1107 pos = 0;
1108 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1109 pos = 1;
1110 else
1111 pos = 2;
1112 for (i = 0; i < num_algs; i++) {
1113 pos++;
1114 if (pos >= num_algs)
1115 pos = 0;
1116 if (algs[pos] == ifsta->auth_alg ||
1117 algs[pos] == 0xff)
1118 continue;
1119 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1120 !ieee80211_sta_wep_configured(sdata))
1121 continue;
1122 ifsta->auth_alg = algs[pos];
1123 break;
1124 }
1125 }
1126 return;
1127 }
1128
1129 switch (ifsta->auth_alg) {
1130 case WLAN_AUTH_OPEN:
1131 case WLAN_AUTH_LEAP:
1132 ieee80211_auth_completed(sdata, ifsta);
1133 break;
1134 case WLAN_AUTH_SHARED_KEY:
1135 if (ifsta->auth_transaction == 4)
1136 ieee80211_auth_completed(sdata, ifsta);
1137 else
1138 ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1139 break;
1140 }
1141 }
1142
1143
ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta,struct ieee80211_mgmt * mgmt,size_t len)1144 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1145 struct ieee80211_if_sta *ifsta,
1146 struct ieee80211_mgmt *mgmt,
1147 size_t len)
1148 {
1149 u16 reason_code;
1150
1151 if (len < 24 + 2)
1152 return;
1153
1154 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1155 return;
1156
1157 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1158
1159 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1160 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1161 sdata->dev->name, reason_code);
1162
1163 if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1164 ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1165 ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1166 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1167 mod_timer(&ifsta->timer, jiffies +
1168 IEEE80211_RETRY_AUTH_INTERVAL);
1169 }
1170
1171 ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1172 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1173 }
1174
1175
ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta,struct ieee80211_mgmt * mgmt,size_t len)1176 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1177 struct ieee80211_if_sta *ifsta,
1178 struct ieee80211_mgmt *mgmt,
1179 size_t len)
1180 {
1181 u16 reason_code;
1182
1183 if (len < 24 + 2)
1184 return;
1185
1186 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1187 return;
1188
1189 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1190
1191 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1192 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1193 sdata->dev->name, reason_code);
1194
1195 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1196 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1197 mod_timer(&ifsta->timer, jiffies +
1198 IEEE80211_RETRY_AUTH_INTERVAL);
1199 }
1200
1201 ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1202 }
1203
1204
ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta,struct ieee80211_mgmt * mgmt,size_t len,int reassoc)1205 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1206 struct ieee80211_if_sta *ifsta,
1207 struct ieee80211_mgmt *mgmt,
1208 size_t len,
1209 int reassoc)
1210 {
1211 struct ieee80211_local *local = sdata->local;
1212 struct ieee80211_supported_band *sband;
1213 struct sta_info *sta;
1214 u64 rates, basic_rates;
1215 u16 capab_info, status_code, aid;
1216 struct ieee802_11_elems elems;
1217 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1218 u8 *pos;
1219 u32 changed = 0;
1220 int i, j;
1221 bool have_higher_than_11mbit = false, newsta = false;
1222 u16 ap_ht_cap_flags;
1223
1224 /* AssocResp and ReassocResp have identical structure, so process both
1225 * of them in this function. */
1226
1227 if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1228 return;
1229
1230 if (len < 24 + 6)
1231 return;
1232
1233 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1234 return;
1235
1236 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1237 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1238 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1239
1240 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1241 "status=%d aid=%d)\n",
1242 sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1243 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1244
1245 if (status_code != WLAN_STATUS_SUCCESS) {
1246 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1247 sdata->dev->name, status_code);
1248 /* if this was a reassociation, ensure we try a "full"
1249 * association next time. This works around some broken APs
1250 * which do not correctly reject reassociation requests. */
1251 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1252 return;
1253 }
1254
1255 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1256 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1257 "set\n", sdata->dev->name, aid);
1258 aid &= ~(BIT(15) | BIT(14));
1259
1260 pos = mgmt->u.assoc_resp.variable;
1261 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1262
1263 if (!elems.supp_rates) {
1264 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1265 sdata->dev->name);
1266 return;
1267 }
1268
1269 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1270 ifsta->aid = aid;
1271 ifsta->ap_capab = capab_info;
1272
1273 kfree(ifsta->assocresp_ies);
1274 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1275 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1276 if (ifsta->assocresp_ies)
1277 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1278
1279 rcu_read_lock();
1280
1281 /* Add STA entry for the AP */
1282 sta = sta_info_get(local, ifsta->bssid);
1283 if (!sta) {
1284 struct ieee80211_bss *bss;
1285
1286 newsta = true;
1287
1288 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1289 if (!sta) {
1290 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1291 " the AP\n", sdata->dev->name);
1292 rcu_read_unlock();
1293 return;
1294 }
1295 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1296 local->hw.conf.channel->center_freq,
1297 ifsta->ssid, ifsta->ssid_len);
1298 if (bss) {
1299 sta->last_signal = bss->signal;
1300 sta->last_qual = bss->qual;
1301 sta->last_noise = bss->noise;
1302 ieee80211_rx_bss_put(local, bss);
1303 }
1304
1305 /* update new sta with its last rx activity */
1306 sta->last_rx = jiffies;
1307 }
1308
1309 /*
1310 * FIXME: Do we really need to update the sta_info's information here?
1311 * We already know about the AP (we found it in our list) so it
1312 * should already be filled with the right info, no?
1313 * As is stands, all this is racy because typically we assume
1314 * the information that is filled in here (except flags) doesn't
1315 * change while a STA structure is alive. As such, it should move
1316 * to between the sta_info_alloc() and sta_info_insert() above.
1317 */
1318
1319 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1320 WLAN_STA_AUTHORIZED);
1321
1322 rates = 0;
1323 basic_rates = 0;
1324 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1325
1326 for (i = 0; i < elems.supp_rates_len; i++) {
1327 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1328 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1329
1330 if (rate > 110)
1331 have_higher_than_11mbit = true;
1332
1333 for (j = 0; j < sband->n_bitrates; j++) {
1334 if (sband->bitrates[j].bitrate == rate) {
1335 rates |= BIT(j);
1336 if (is_basic)
1337 basic_rates |= BIT(j);
1338 break;
1339 }
1340 }
1341 }
1342
1343 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1344 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1345 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1346
1347 if (rate > 110)
1348 have_higher_than_11mbit = true;
1349
1350 for (j = 0; j < sband->n_bitrates; j++) {
1351 if (sband->bitrates[j].bitrate == rate) {
1352 rates |= BIT(j);
1353 if (is_basic)
1354 basic_rates |= BIT(j);
1355 break;
1356 }
1357 }
1358 }
1359
1360 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1361 sdata->vif.bss_conf.basic_rates = basic_rates;
1362
1363 /* cf. IEEE 802.11 9.2.12 */
1364 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1365 have_higher_than_11mbit)
1366 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1367 else
1368 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1369
1370 if (elems.ht_cap_elem)
1371 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1372 elems.ht_cap_elem, &sta->sta.ht_cap);
1373
1374 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1375
1376 rate_control_rate_init(sta);
1377
1378 if (elems.wmm_param)
1379 set_sta_flags(sta, WLAN_STA_WME);
1380
1381 if (newsta) {
1382 int err = sta_info_insert(sta);
1383 if (err) {
1384 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1385 " the AP (error %d)\n", sdata->dev->name, err);
1386 rcu_read_unlock();
1387 return;
1388 }
1389 }
1390
1391 rcu_read_unlock();
1392
1393 if (elems.wmm_param)
1394 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1395 elems.wmm_param_len);
1396
1397 if (elems.ht_info_elem && elems.wmm_param &&
1398 (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1399 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1400 ap_ht_cap_flags);
1401
1402 /* set AID and assoc capability,
1403 * ieee80211_set_associated() will tell the driver */
1404 bss_conf->aid = aid;
1405 bss_conf->assoc_capability = capab_info;
1406 ieee80211_set_associated(sdata, ifsta, changed);
1407
1408 ieee80211_associated(sdata, ifsta);
1409 }
1410
1411
ieee80211_sta_join_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta,struct ieee80211_bss * bss)1412 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1413 struct ieee80211_if_sta *ifsta,
1414 struct ieee80211_bss *bss)
1415 {
1416 struct ieee80211_local *local = sdata->local;
1417 int res, rates, i, j;
1418 struct sk_buff *skb;
1419 struct ieee80211_mgmt *mgmt;
1420 u8 *pos;
1421 struct ieee80211_supported_band *sband;
1422 union iwreq_data wrqu;
1423
1424 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
1425 if (!skb) {
1426 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1427 "response\n", sdata->dev->name);
1428 return -ENOMEM;
1429 }
1430
1431 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1432
1433 /* Remove possible STA entries from other IBSS networks. */
1434 sta_info_flush_delayed(sdata);
1435
1436 if (local->ops->reset_tsf) {
1437 /* Reset own TSF to allow time synchronization work. */
1438 local->ops->reset_tsf(local_to_hw(local));
1439 }
1440 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1441 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1442 if (res)
1443 return res;
1444
1445 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1446
1447 sdata->drop_unencrypted = bss->capability &
1448 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1449
1450 res = ieee80211_set_freq(sdata, bss->freq);
1451
1452 if (res)
1453 return res;
1454
1455 /* Build IBSS probe response */
1456
1457 skb_reserve(skb, local->hw.extra_tx_headroom);
1458
1459 mgmt = (struct ieee80211_mgmt *)
1460 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1461 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1462 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1463 IEEE80211_STYPE_PROBE_RESP);
1464 memset(mgmt->da, 0xff, ETH_ALEN);
1465 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1466 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1467 mgmt->u.beacon.beacon_int =
1468 cpu_to_le16(local->hw.conf.beacon_int);
1469 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1470 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1471
1472 pos = skb_put(skb, 2 + ifsta->ssid_len);
1473 *pos++ = WLAN_EID_SSID;
1474 *pos++ = ifsta->ssid_len;
1475 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1476
1477 rates = bss->supp_rates_len;
1478 if (rates > 8)
1479 rates = 8;
1480 pos = skb_put(skb, 2 + rates);
1481 *pos++ = WLAN_EID_SUPP_RATES;
1482 *pos++ = rates;
1483 memcpy(pos, bss->supp_rates, rates);
1484
1485 if (bss->band == IEEE80211_BAND_2GHZ) {
1486 pos = skb_put(skb, 2 + 1);
1487 *pos++ = WLAN_EID_DS_PARAMS;
1488 *pos++ = 1;
1489 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1490 }
1491
1492 pos = skb_put(skb, 2 + 2);
1493 *pos++ = WLAN_EID_IBSS_PARAMS;
1494 *pos++ = 2;
1495 /* FIX: set ATIM window based on scan results */
1496 *pos++ = 0;
1497 *pos++ = 0;
1498
1499 if (bss->supp_rates_len > 8) {
1500 rates = bss->supp_rates_len - 8;
1501 pos = skb_put(skb, 2 + rates);
1502 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1503 *pos++ = rates;
1504 memcpy(pos, &bss->supp_rates[8], rates);
1505 }
1506
1507 ifsta->probe_resp = skb;
1508
1509 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
1510
1511
1512 rates = 0;
1513 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1514 for (i = 0; i < bss->supp_rates_len; i++) {
1515 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1516 for (j = 0; j < sband->n_bitrates; j++)
1517 if (sband->bitrates[j].bitrate == bitrate)
1518 rates |= BIT(j);
1519 }
1520 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1521
1522 ieee80211_sta_def_wmm_params(sdata, bss);
1523
1524 ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1525 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1526
1527 ieee80211_led_assoc(local, true);
1528
1529 memset(&wrqu, 0, sizeof(wrqu));
1530 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1531 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1532
1533 return res;
1534 }
1535
ieee80211_rx_bss_info(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status,struct ieee802_11_elems * elems,bool beacon)1536 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1537 struct ieee80211_mgmt *mgmt,
1538 size_t len,
1539 struct ieee80211_rx_status *rx_status,
1540 struct ieee802_11_elems *elems,
1541 bool beacon)
1542 {
1543 struct ieee80211_local *local = sdata->local;
1544 int freq;
1545 struct ieee80211_bss *bss;
1546 struct sta_info *sta;
1547 struct ieee80211_channel *channel;
1548 u64 beacon_timestamp, rx_timestamp;
1549 u64 supp_rates = 0;
1550 enum ieee80211_band band = rx_status->band;
1551
1552 if (elems->ds_params && elems->ds_params_len == 1)
1553 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1554 else
1555 freq = rx_status->freq;
1556
1557 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1558
1559 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1560 return;
1561
1562 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1563 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1564 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1565
1566 rcu_read_lock();
1567
1568 sta = sta_info_get(local, mgmt->sa);
1569 if (sta) {
1570 u64 prev_rates;
1571
1572 prev_rates = sta->sta.supp_rates[band];
1573 /* make sure mandatory rates are always added */
1574 sta->sta.supp_rates[band] = supp_rates |
1575 ieee80211_mandatory_rates(local, band);
1576
1577 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1578 if (sta->sta.supp_rates[band] != prev_rates)
1579 printk(KERN_DEBUG "%s: updated supp_rates set "
1580 "for %pM based on beacon info (0x%llx | "
1581 "0x%llx -> 0x%llx)\n",
1582 sdata->dev->name,
1583 sta->sta.addr,
1584 (unsigned long long) prev_rates,
1585 (unsigned long long) supp_rates,
1586 (unsigned long long) sta->sta.supp_rates[band]);
1587 #endif
1588 } else {
1589 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1590 }
1591
1592 rcu_read_unlock();
1593 }
1594
1595 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1596 freq, beacon);
1597 if (!bss)
1598 return;
1599
1600 /* was just updated in ieee80211_bss_info_update */
1601 beacon_timestamp = bss->timestamp;
1602
1603 /*
1604 * In STA mode, the remaining parameters should not be overridden
1605 * by beacons because they're not necessarily accurate there.
1606 */
1607 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1608 bss->last_probe_resp && beacon) {
1609 ieee80211_rx_bss_put(local, bss);
1610 return;
1611 }
1612
1613 /* check if we need to merge IBSS */
1614 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1615 bss->capability & WLAN_CAPABILITY_IBSS &&
1616 bss->freq == local->oper_channel->center_freq &&
1617 elems->ssid_len == sdata->u.sta.ssid_len &&
1618 memcmp(elems->ssid, sdata->u.sta.ssid,
1619 sdata->u.sta.ssid_len) == 0) {
1620 if (rx_status->flag & RX_FLAG_TSFT) {
1621 /* in order for correct IBSS merging we need mactime
1622 *
1623 * since mactime is defined as the time the first data
1624 * symbol of the frame hits the PHY, and the timestamp
1625 * of the beacon is defined as "the time that the data
1626 * symbol containing the first bit of the timestamp is
1627 * transmitted to the PHY plus the transmitting STA’s
1628 * delays through its local PHY from the MAC-PHY
1629 * interface to its interface with the WM"
1630 * (802.11 11.1.2) - equals the time this bit arrives at
1631 * the receiver - we have to take into account the
1632 * offset between the two.
1633 * e.g: at 1 MBit that means mactime is 192 usec earlier
1634 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1635 */
1636 int rate;
1637 if (rx_status->flag & RX_FLAG_HT) {
1638 rate = 65; /* TODO: HT rates */
1639 } else {
1640 rate = local->hw.wiphy->bands[band]->
1641 bitrates[rx_status->rate_idx].bitrate;
1642 }
1643 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1644 } else if (local && local->ops && local->ops->get_tsf)
1645 /* second best option: get current TSF */
1646 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1647 else
1648 /* can't merge without knowing the TSF */
1649 rx_timestamp = -1LLU;
1650 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1651 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1652 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1653 mgmt->sa, mgmt->bssid,
1654 (unsigned long long)rx_timestamp,
1655 (unsigned long long)beacon_timestamp,
1656 (unsigned long long)(rx_timestamp - beacon_timestamp),
1657 jiffies);
1658 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1659 if (beacon_timestamp > rx_timestamp) {
1660 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1661 printk(KERN_DEBUG "%s: beacon TSF higher than "
1662 "local TSF - IBSS merge with BSSID %pM\n",
1663 sdata->dev->name, mgmt->bssid);
1664 #endif
1665 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1666 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1667 }
1668 }
1669
1670 ieee80211_rx_bss_put(local, bss);
1671 }
1672
1673
ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status)1674 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1675 struct ieee80211_mgmt *mgmt,
1676 size_t len,
1677 struct ieee80211_rx_status *rx_status)
1678 {
1679 size_t baselen;
1680 struct ieee802_11_elems elems;
1681 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1682
1683 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1684 return; /* ignore ProbeResp to foreign address */
1685
1686 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1687 if (baselen > len)
1688 return;
1689
1690 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1691 &elems);
1692
1693 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1694
1695 /* direct probe may be part of the association flow */
1696 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1697 &ifsta->request)) {
1698 printk(KERN_DEBUG "%s direct probe responded\n",
1699 sdata->dev->name);
1700 ieee80211_authenticate(sdata, ifsta);
1701 }
1702 }
1703
1704
ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status)1705 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1706 struct ieee80211_mgmt *mgmt,
1707 size_t len,
1708 struct ieee80211_rx_status *rx_status)
1709 {
1710 struct ieee80211_if_sta *ifsta;
1711 size_t baselen;
1712 struct ieee802_11_elems elems;
1713 struct ieee80211_local *local = sdata->local;
1714 u32 changed = 0;
1715 bool erp_valid;
1716 u8 erp_value = 0;
1717
1718 /* Process beacon from the current BSS */
1719 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1720 if (baselen > len)
1721 return;
1722
1723 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1724
1725 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1726
1727 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1728 return;
1729 ifsta = &sdata->u.sta;
1730
1731 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1732 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1733 return;
1734
1735 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1736 elems.wmm_param_len);
1737
1738
1739 if (elems.erp_info && elems.erp_info_len >= 1) {
1740 erp_valid = true;
1741 erp_value = elems.erp_info[0];
1742 } else {
1743 erp_valid = false;
1744 }
1745 changed |= ieee80211_handle_bss_capability(sdata,
1746 le16_to_cpu(mgmt->u.beacon.capab_info),
1747 erp_valid, erp_value);
1748
1749
1750 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1751 struct sta_info *sta;
1752 struct ieee80211_supported_band *sband;
1753 u16 ap_ht_cap_flags;
1754
1755 rcu_read_lock();
1756
1757 sta = sta_info_get(local, ifsta->bssid);
1758 if (!sta) {
1759 rcu_read_unlock();
1760 return;
1761 }
1762
1763 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1764
1765 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1766 elems.ht_cap_elem, &sta->sta.ht_cap);
1767
1768 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1769
1770 rcu_read_unlock();
1771
1772 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1773 ap_ht_cap_flags);
1774 }
1775
1776 if (elems.country_elem) {
1777 /* Note we are only reviewing this on beacons
1778 * for the BSSID we are associated to */
1779 regulatory_hint_11d(local->hw.wiphy,
1780 elems.country_elem, elems.country_elem_len);
1781 }
1782
1783 ieee80211_bss_info_change_notify(sdata, changed);
1784 }
1785
1786
ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status)1787 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1788 struct ieee80211_if_sta *ifsta,
1789 struct ieee80211_mgmt *mgmt,
1790 size_t len,
1791 struct ieee80211_rx_status *rx_status)
1792 {
1793 struct ieee80211_local *local = sdata->local;
1794 int tx_last_beacon;
1795 struct sk_buff *skb;
1796 struct ieee80211_mgmt *resp;
1797 u8 *pos, *end;
1798
1799 if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1800 ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1801 len < 24 + 2 || !ifsta->probe_resp)
1802 return;
1803
1804 if (local->ops->tx_last_beacon)
1805 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1806 else
1807 tx_last_beacon = 1;
1808
1809 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1810 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
1811 " (tx_last_beacon=%d)\n",
1812 sdata->dev->name, mgmt->sa, mgmt->da,
1813 mgmt->bssid, tx_last_beacon);
1814 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1815
1816 if (!tx_last_beacon)
1817 return;
1818
1819 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1820 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1821 return;
1822
1823 end = ((u8 *) mgmt) + len;
1824 pos = mgmt->u.probe_req.variable;
1825 if (pos[0] != WLAN_EID_SSID ||
1826 pos + 2 + pos[1] > end) {
1827 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1828 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1829 "from %pM\n",
1830 sdata->dev->name, mgmt->sa);
1831 #endif
1832 return;
1833 }
1834 if (pos[1] != 0 &&
1835 (pos[1] != ifsta->ssid_len ||
1836 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1837 /* Ignore ProbeReq for foreign SSID */
1838 return;
1839 }
1840
1841 /* Reply with ProbeResp */
1842 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1843 if (!skb)
1844 return;
1845
1846 resp = (struct ieee80211_mgmt *) skb->data;
1847 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1848 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1849 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
1850 sdata->dev->name, resp->da);
1851 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1852 ieee80211_tx_skb(sdata, skb, 0);
1853 }
1854
ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,struct ieee80211_rx_status * rx_status)1855 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1856 struct ieee80211_rx_status *rx_status)
1857 {
1858 struct ieee80211_local *local = sdata->local;
1859 struct ieee80211_if_sta *ifsta;
1860 struct ieee80211_mgmt *mgmt;
1861 u16 fc;
1862
1863 if (skb->len < 24)
1864 goto fail;
1865
1866 ifsta = &sdata->u.sta;
1867
1868 mgmt = (struct ieee80211_mgmt *) skb->data;
1869 fc = le16_to_cpu(mgmt->frame_control);
1870
1871 switch (fc & IEEE80211_FCTL_STYPE) {
1872 case IEEE80211_STYPE_PROBE_REQ:
1873 case IEEE80211_STYPE_PROBE_RESP:
1874 case IEEE80211_STYPE_BEACON:
1875 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1876 case IEEE80211_STYPE_AUTH:
1877 case IEEE80211_STYPE_ASSOC_RESP:
1878 case IEEE80211_STYPE_REASSOC_RESP:
1879 case IEEE80211_STYPE_DEAUTH:
1880 case IEEE80211_STYPE_DISASSOC:
1881 skb_queue_tail(&ifsta->skb_queue, skb);
1882 queue_work(local->hw.workqueue, &ifsta->work);
1883 return;
1884 }
1885
1886 fail:
1887 kfree_skb(skb);
1888 }
1889
ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1890 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1891 struct sk_buff *skb)
1892 {
1893 struct ieee80211_rx_status *rx_status;
1894 struct ieee80211_if_sta *ifsta;
1895 struct ieee80211_mgmt *mgmt;
1896 u16 fc;
1897
1898 ifsta = &sdata->u.sta;
1899
1900 rx_status = (struct ieee80211_rx_status *) skb->cb;
1901 mgmt = (struct ieee80211_mgmt *) skb->data;
1902 fc = le16_to_cpu(mgmt->frame_control);
1903
1904 switch (fc & IEEE80211_FCTL_STYPE) {
1905 case IEEE80211_STYPE_PROBE_REQ:
1906 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
1907 rx_status);
1908 break;
1909 case IEEE80211_STYPE_PROBE_RESP:
1910 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
1911 break;
1912 case IEEE80211_STYPE_BEACON:
1913 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
1914 break;
1915 case IEEE80211_STYPE_AUTH:
1916 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
1917 break;
1918 case IEEE80211_STYPE_ASSOC_RESP:
1919 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
1920 break;
1921 case IEEE80211_STYPE_REASSOC_RESP:
1922 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
1923 break;
1924 case IEEE80211_STYPE_DEAUTH:
1925 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
1926 break;
1927 case IEEE80211_STYPE_DISASSOC:
1928 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
1929 break;
1930 }
1931
1932 kfree_skb(skb);
1933 }
1934
1935
ieee80211_sta_active_ibss(struct ieee80211_sub_if_data * sdata)1936 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
1937 {
1938 struct ieee80211_local *local = sdata->local;
1939 int active = 0;
1940 struct sta_info *sta;
1941
1942 rcu_read_lock();
1943
1944 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1945 if (sta->sdata == sdata &&
1946 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1947 jiffies)) {
1948 active++;
1949 break;
1950 }
1951 }
1952
1953 rcu_read_unlock();
1954
1955 return active;
1956 }
1957
1958
ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta)1959 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
1960 struct ieee80211_if_sta *ifsta)
1961 {
1962 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1963
1964 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
1965 if (ieee80211_sta_active_ibss(sdata))
1966 return;
1967
1968 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
1969 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
1970 ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
1971 }
1972
1973
ieee80211_sta_timer(unsigned long data)1974 static void ieee80211_sta_timer(unsigned long data)
1975 {
1976 struct ieee80211_sub_if_data *sdata =
1977 (struct ieee80211_sub_if_data *) data;
1978 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1979 struct ieee80211_local *local = sdata->local;
1980
1981 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
1982 queue_work(local->hw.workqueue, &ifsta->work);
1983 }
1984
ieee80211_sta_reset_auth(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta)1985 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
1986 struct ieee80211_if_sta *ifsta)
1987 {
1988 struct ieee80211_local *local = sdata->local;
1989
1990 if (local->ops->reset_tsf) {
1991 /* Reset own TSF to allow time synchronization work. */
1992 local->ops->reset_tsf(local_to_hw(local));
1993 }
1994
1995 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
1996
1997
1998 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1999 ifsta->auth_alg = WLAN_AUTH_OPEN;
2000 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2001 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2002 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2003 ifsta->auth_alg = WLAN_AUTH_LEAP;
2004 else
2005 ifsta->auth_alg = WLAN_AUTH_OPEN;
2006 ifsta->auth_transaction = -1;
2007 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2008 ifsta->assoc_scan_tries = 0;
2009 ifsta->direct_probe_tries = 0;
2010 ifsta->auth_tries = 0;
2011 ifsta->assoc_tries = 0;
2012 netif_tx_stop_all_queues(sdata->dev);
2013 netif_carrier_off(sdata->dev);
2014 }
2015
2016
ieee80211_sta_match_ssid(struct ieee80211_if_sta * ifsta,const char * ssid,int ssid_len)2017 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
2018 const char *ssid, int ssid_len)
2019 {
2020 int tmp, hidden_ssid;
2021
2022 if (ssid_len == ifsta->ssid_len &&
2023 !memcmp(ifsta->ssid, ssid, ssid_len))
2024 return 1;
2025
2026 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2027 return 0;
2028
2029 hidden_ssid = 1;
2030 tmp = ssid_len;
2031 while (tmp--) {
2032 if (ssid[tmp] != '\0') {
2033 hidden_ssid = 0;
2034 break;
2035 }
2036 }
2037
2038 if (hidden_ssid && (ifsta->ssid_len == ssid_len || ssid_len == 0))
2039 return 1;
2040
2041 if (ssid_len == 1 && ssid[0] == ' ')
2042 return 1;
2043
2044 return 0;
2045 }
2046
ieee80211_sta_create_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta)2047 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2048 struct ieee80211_if_sta *ifsta)
2049 {
2050 struct ieee80211_local *local = sdata->local;
2051 struct ieee80211_bss *bss;
2052 struct ieee80211_supported_band *sband;
2053 u8 bssid[ETH_ALEN], *pos;
2054 int i;
2055 int ret;
2056
2057 #if 0
2058 /* Easier testing, use fixed BSSID. */
2059 memset(bssid, 0xfe, ETH_ALEN);
2060 #else
2061 /* Generate random, not broadcast, locally administered BSSID. Mix in
2062 * own MAC address to make sure that devices that do not have proper
2063 * random number generator get different BSSID. */
2064 get_random_bytes(bssid, ETH_ALEN);
2065 for (i = 0; i < ETH_ALEN; i++)
2066 bssid[i] ^= sdata->dev->dev_addr[i];
2067 bssid[0] &= ~0x01;
2068 bssid[0] |= 0x02;
2069 #endif
2070
2071 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2072 sdata->dev->name, bssid);
2073
2074 bss = ieee80211_rx_bss_add(local, bssid,
2075 local->hw.conf.channel->center_freq,
2076 sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2077 if (!bss)
2078 return -ENOMEM;
2079
2080 bss->band = local->hw.conf.channel->band;
2081 sband = local->hw.wiphy->bands[bss->band];
2082
2083 if (local->hw.conf.beacon_int == 0)
2084 local->hw.conf.beacon_int = 100;
2085 bss->beacon_int = local->hw.conf.beacon_int;
2086 bss->last_update = jiffies;
2087 bss->capability = WLAN_CAPABILITY_IBSS;
2088
2089 if (sdata->default_key)
2090 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2091 else
2092 sdata->drop_unencrypted = 0;
2093
2094 bss->supp_rates_len = sband->n_bitrates;
2095 pos = bss->supp_rates;
2096 for (i = 0; i < sband->n_bitrates; i++) {
2097 int rate = sband->bitrates[i].bitrate;
2098 *pos++ = (u8) (rate / 5);
2099 }
2100
2101 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2102 ieee80211_rx_bss_put(local, bss);
2103 return ret;
2104 }
2105
2106
ieee80211_sta_find_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta)2107 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2108 struct ieee80211_if_sta *ifsta)
2109 {
2110 struct ieee80211_local *local = sdata->local;
2111 struct ieee80211_bss *bss;
2112 int found = 0;
2113 u8 bssid[ETH_ALEN];
2114 int active_ibss;
2115
2116 if (ifsta->ssid_len == 0)
2117 return -EINVAL;
2118
2119 active_ibss = ieee80211_sta_active_ibss(sdata);
2120 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2121 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2122 sdata->dev->name, active_ibss);
2123 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2124 spin_lock_bh(&local->bss_lock);
2125 list_for_each_entry(bss, &local->bss_list, list) {
2126 if (ifsta->ssid_len != bss->ssid_len ||
2127 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2128 || !(bss->capability & WLAN_CAPABILITY_IBSS))
2129 continue;
2130 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2131 printk(KERN_DEBUG " bssid=%pM found\n", bss->bssid);
2132 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2133 memcpy(bssid, bss->bssid, ETH_ALEN);
2134 found = 1;
2135 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2136 break;
2137 }
2138 spin_unlock_bh(&local->bss_lock);
2139
2140 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2141 if (found)
2142 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
2143 "%pM\n", bssid, ifsta->bssid);
2144 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2145
2146 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2147 int ret;
2148 int search_freq;
2149
2150 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2151 search_freq = bss->freq;
2152 else
2153 search_freq = local->hw.conf.channel->center_freq;
2154
2155 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2156 ifsta->ssid, ifsta->ssid_len);
2157 if (!bss)
2158 goto dont_join;
2159
2160 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2161 " based on configured SSID\n",
2162 sdata->dev->name, bssid);
2163 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2164 ieee80211_rx_bss_put(local, bss);
2165 return ret;
2166 }
2167
2168 dont_join:
2169 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2170 printk(KERN_DEBUG " did not try to join ibss\n");
2171 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2172
2173 /* Selected IBSS not found in current scan results - try to scan */
2174 if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2175 !ieee80211_sta_active_ibss(sdata)) {
2176 mod_timer(&ifsta->timer, jiffies +
2177 IEEE80211_IBSS_MERGE_INTERVAL);
2178 } else if (time_after(jiffies, local->last_scan_completed +
2179 IEEE80211_SCAN_INTERVAL)) {
2180 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2181 "join\n", sdata->dev->name);
2182 return ieee80211_request_scan(sdata, ifsta->ssid,
2183 ifsta->ssid_len);
2184 } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2185 int interval = IEEE80211_SCAN_INTERVAL;
2186
2187 if (time_after(jiffies, ifsta->ibss_join_req +
2188 IEEE80211_IBSS_JOIN_TIMEOUT)) {
2189 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2190 (!(local->oper_channel->flags &
2191 IEEE80211_CHAN_NO_IBSS)))
2192 return ieee80211_sta_create_ibss(sdata, ifsta);
2193 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2194 printk(KERN_DEBUG "%s: IBSS not allowed on"
2195 " %d MHz\n", sdata->dev->name,
2196 local->hw.conf.channel->center_freq);
2197 }
2198
2199 /* No IBSS found - decrease scan interval and continue
2200 * scanning. */
2201 interval = IEEE80211_SCAN_INTERVAL_SLOW;
2202 }
2203
2204 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2205 mod_timer(&ifsta->timer, jiffies + interval);
2206 return 0;
2207 }
2208
2209 return 0;
2210 }
2211
2212
ieee80211_sta_config_auth(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta)2213 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2214 struct ieee80211_if_sta *ifsta)
2215 {
2216 struct ieee80211_local *local = sdata->local;
2217 struct ieee80211_bss *bss, *selected = NULL;
2218 int top_rssi = 0, freq;
2219
2220 spin_lock_bh(&local->bss_lock);
2221 freq = local->oper_channel->center_freq;
2222 list_for_each_entry(bss, &local->bss_list, list) {
2223 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2224 continue;
2225
2226 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2227 IEEE80211_STA_AUTO_BSSID_SEL |
2228 IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2229 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2230 !!sdata->default_key))
2231 continue;
2232
2233 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2234 bss->freq != freq)
2235 continue;
2236
2237 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2238 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2239 continue;
2240
2241 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2242 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2243 continue;
2244
2245 if (!selected || top_rssi < bss->signal) {
2246 selected = bss;
2247 top_rssi = bss->signal;
2248 }
2249 }
2250 if (selected)
2251 atomic_inc(&selected->users);
2252 spin_unlock_bh(&local->bss_lock);
2253
2254 if (selected) {
2255 ieee80211_set_freq(sdata, selected->freq);
2256 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2257 ieee80211_sta_set_ssid(sdata, selected->ssid,
2258 selected->ssid_len);
2259 ieee80211_sta_set_bssid(sdata, selected->bssid);
2260 ieee80211_sta_def_wmm_params(sdata, selected);
2261
2262 /* Send out direct probe if no probe resp was received or
2263 * the one we have is outdated
2264 */
2265 if (!selected->last_probe_resp ||
2266 time_after(jiffies, selected->last_probe_resp
2267 + IEEE80211_SCAN_RESULT_EXPIRE))
2268 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2269 else
2270 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2271
2272 ieee80211_rx_bss_put(local, selected);
2273 ieee80211_sta_reset_auth(sdata, ifsta);
2274 return 0;
2275 } else {
2276 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2277 ifsta->assoc_scan_tries++;
2278 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2279 ieee80211_start_scan(sdata, NULL, 0);
2280 else
2281 ieee80211_start_scan(sdata, ifsta->ssid,
2282 ifsta->ssid_len);
2283 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2284 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2285 } else
2286 ifsta->state = IEEE80211_STA_MLME_DISABLED;
2287 }
2288 return -1;
2289 }
2290
2291
ieee80211_sta_work(struct work_struct * work)2292 static void ieee80211_sta_work(struct work_struct *work)
2293 {
2294 struct ieee80211_sub_if_data *sdata =
2295 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2296 struct ieee80211_local *local = sdata->local;
2297 struct ieee80211_if_sta *ifsta;
2298 struct sk_buff *skb;
2299
2300 if (!netif_running(sdata->dev))
2301 return;
2302
2303 if (local->sw_scanning || local->hw_scanning)
2304 return;
2305
2306 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2307 sdata->vif.type != NL80211_IFTYPE_ADHOC))
2308 return;
2309 ifsta = &sdata->u.sta;
2310
2311 while ((skb = skb_dequeue(&ifsta->skb_queue)))
2312 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2313
2314 if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2315 ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2316 ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2317 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2318 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2319 ifsta->scan_ssid_len);
2320 return;
2321 }
2322
2323 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2324 if (ieee80211_sta_config_auth(sdata, ifsta))
2325 return;
2326 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2327 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2328 return;
2329
2330 switch (ifsta->state) {
2331 case IEEE80211_STA_MLME_DISABLED:
2332 break;
2333 case IEEE80211_STA_MLME_DIRECT_PROBE:
2334 ieee80211_direct_probe(sdata, ifsta);
2335 break;
2336 case IEEE80211_STA_MLME_AUTHENTICATE:
2337 ieee80211_authenticate(sdata, ifsta);
2338 break;
2339 case IEEE80211_STA_MLME_ASSOCIATE:
2340 ieee80211_associate(sdata, ifsta);
2341 break;
2342 case IEEE80211_STA_MLME_ASSOCIATED:
2343 ieee80211_associated(sdata, ifsta);
2344 break;
2345 case IEEE80211_STA_MLME_IBSS_SEARCH:
2346 ieee80211_sta_find_ibss(sdata, ifsta);
2347 break;
2348 case IEEE80211_STA_MLME_IBSS_JOINED:
2349 ieee80211_sta_merge_ibss(sdata, ifsta);
2350 break;
2351 default:
2352 WARN_ON(1);
2353 break;
2354 }
2355
2356 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2357 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2358 "mixed-cell disabled - disassociate\n", sdata->dev->name);
2359
2360 ieee80211_set_disassoc(sdata, ifsta, false, true,
2361 WLAN_REASON_UNSPECIFIED);
2362 }
2363 }
2364
ieee80211_restart_sta_timer(struct ieee80211_sub_if_data * sdata)2365 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2366 {
2367 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2368 queue_work(sdata->local->hw.workqueue,
2369 &sdata->u.sta.work);
2370 }
2371
2372 /* interface setup */
ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data * sdata)2373 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2374 {
2375 struct ieee80211_if_sta *ifsta;
2376
2377 ifsta = &sdata->u.sta;
2378 INIT_WORK(&ifsta->work, ieee80211_sta_work);
2379 setup_timer(&ifsta->timer, ieee80211_sta_timer,
2380 (unsigned long) sdata);
2381 skb_queue_head_init(&ifsta->skb_queue);
2382
2383 ifsta->capab = WLAN_CAPABILITY_ESS;
2384 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2385 IEEE80211_AUTH_ALG_SHARED_KEY;
2386 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2387 IEEE80211_STA_AUTO_BSSID_SEL |
2388 IEEE80211_STA_AUTO_CHANNEL_SEL;
2389 if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2390 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2391 }
2392
2393 /*
2394 * Add a new IBSS station, will also be called by the RX code when,
2395 * in IBSS mode, receiving a frame from a yet-unknown station, hence
2396 * must be callable in atomic context.
2397 */
ieee80211_ibss_add_sta(struct ieee80211_sub_if_data * sdata,u8 * bssid,u8 * addr,u64 supp_rates)2398 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2399 u8 *bssid,u8 *addr, u64 supp_rates)
2400 {
2401 struct ieee80211_local *local = sdata->local;
2402 struct sta_info *sta;
2403 int band = local->hw.conf.channel->band;
2404
2405 /* TODO: Could consider removing the least recently used entry and
2406 * allow new one to be added. */
2407 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2408 if (net_ratelimit()) {
2409 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2410 "entry %pM\n", sdata->dev->name, addr);
2411 }
2412 return NULL;
2413 }
2414
2415 if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2416 return NULL;
2417
2418 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2419 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2420 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2421 #endif
2422
2423 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2424 if (!sta)
2425 return NULL;
2426
2427 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2428
2429 /* make sure mandatory rates are always added */
2430 sta->sta.supp_rates[band] = supp_rates |
2431 ieee80211_mandatory_rates(local, band);
2432
2433 rate_control_rate_init(sta);
2434
2435 if (sta_info_insert(sta))
2436 return NULL;
2437
2438 return sta;
2439 }
2440
2441 /* configuration hooks */
ieee80211_sta_req_auth(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_sta * ifsta)2442 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2443 struct ieee80211_if_sta *ifsta)
2444 {
2445 struct ieee80211_local *local = sdata->local;
2446
2447 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2448 return;
2449
2450 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2451 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2452 (ifsta->flags & (IEEE80211_STA_SSID_SET |
2453 IEEE80211_STA_AUTO_SSID_SEL))) {
2454
2455 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2456 ieee80211_set_disassoc(sdata, ifsta, true, true,
2457 WLAN_REASON_DEAUTH_LEAVING);
2458
2459 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2460 queue_work(local->hw.workqueue, &ifsta->work);
2461 }
2462 }
2463
ieee80211_sta_set_ssid(struct ieee80211_sub_if_data * sdata,char * ssid,size_t len)2464 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2465 {
2466 struct ieee80211_if_sta *ifsta;
2467
2468 if (len > IEEE80211_MAX_SSID_LEN)
2469 return -EINVAL;
2470
2471 ifsta = &sdata->u.sta;
2472
2473 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2474 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2475 memcpy(ifsta->ssid, ssid, len);
2476 ifsta->ssid_len = len;
2477 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2478 }
2479
2480 if (len)
2481 ifsta->flags |= IEEE80211_STA_SSID_SET;
2482 else
2483 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2484
2485 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
2486 !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2487 ifsta->ibss_join_req = jiffies;
2488 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2489 return ieee80211_sta_find_ibss(sdata, ifsta);
2490 }
2491
2492 return 0;
2493 }
2494
ieee80211_sta_get_ssid(struct ieee80211_sub_if_data * sdata,char * ssid,size_t * len)2495 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2496 {
2497 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2498 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2499 *len = ifsta->ssid_len;
2500 return 0;
2501 }
2502
ieee80211_sta_set_bssid(struct ieee80211_sub_if_data * sdata,u8 * bssid)2503 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2504 {
2505 struct ieee80211_if_sta *ifsta;
2506 int res;
2507
2508 ifsta = &sdata->u.sta;
2509
2510 if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2511 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2512 res = 0;
2513 /*
2514 * Hack! See also ieee80211_sta_set_ssid.
2515 */
2516 if (netif_running(sdata->dev))
2517 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2518 if (res) {
2519 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2520 "the low-level driver\n", sdata->dev->name);
2521 return res;
2522 }
2523 }
2524
2525 if (is_valid_ether_addr(bssid))
2526 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2527 else
2528 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2529
2530 return 0;
2531 }
2532
ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data * sdata,char * ie,size_t len)2533 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2534 {
2535 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2536
2537 kfree(ifsta->extra_ie);
2538 if (len == 0) {
2539 ifsta->extra_ie = NULL;
2540 ifsta->extra_ie_len = 0;
2541 return 0;
2542 }
2543 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2544 if (!ifsta->extra_ie) {
2545 ifsta->extra_ie_len = 0;
2546 return -ENOMEM;
2547 }
2548 memcpy(ifsta->extra_ie, ie, len);
2549 ifsta->extra_ie_len = len;
2550 return 0;
2551 }
2552
ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data * sdata,u16 reason)2553 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2554 {
2555 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2556
2557 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2558 sdata->dev->name, reason);
2559
2560 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2561 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2562 return -EINVAL;
2563
2564 ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2565 return 0;
2566 }
2567
ieee80211_sta_disassociate(struct ieee80211_sub_if_data * sdata,u16 reason)2568 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2569 {
2570 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2571
2572 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2573 sdata->dev->name, reason);
2574
2575 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2576 return -EINVAL;
2577
2578 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2579 return -1;
2580
2581 ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2582 return 0;
2583 }
2584
2585 /* scan finished notification */
ieee80211_mlme_notify_scan_completed(struct ieee80211_local * local)2586 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2587 {
2588 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2589 struct ieee80211_if_sta *ifsta;
2590
2591 if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2592 ifsta = &sdata->u.sta;
2593 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2594 (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2595 !ieee80211_sta_active_ibss(sdata)))
2596 ieee80211_sta_find_ibss(sdata, ifsta);
2597 }
2598
2599 /* Restart STA timers */
2600 rcu_read_lock();
2601 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2602 ieee80211_restart_sta_timer(sdata);
2603 rcu_read_unlock();
2604 }
2605
ieee80211_dynamic_ps_disable_work(struct work_struct * work)2606 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2607 {
2608 struct ieee80211_local *local =
2609 container_of(work, struct ieee80211_local,
2610 dynamic_ps_disable_work);
2611
2612 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2613 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2614 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2615 }
2616
2617 ieee80211_wake_queues_by_reason(&local->hw,
2618 IEEE80211_QUEUE_STOP_REASON_PS);
2619 }
2620
ieee80211_dynamic_ps_enable_work(struct work_struct * work)2621 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2622 {
2623 struct ieee80211_local *local =
2624 container_of(work, struct ieee80211_local,
2625 dynamic_ps_enable_work);
2626
2627 if (local->hw.conf.flags & IEEE80211_CONF_PS)
2628 return;
2629
2630 local->hw.conf.flags |= IEEE80211_CONF_PS;
2631
2632 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2633 }
2634
ieee80211_dynamic_ps_timer(unsigned long data)2635 void ieee80211_dynamic_ps_timer(unsigned long data)
2636 {
2637 struct ieee80211_local *local = (void *) data;
2638
2639 queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2640 }
2641