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ath9k: Update comments for not parsing DTIM period
[wandboard.git] / net / mac80211 / ibss.c
blob775fb63471c457a68bef8439f59e9335a2392b5b
1 /*
2 * IBSS mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.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 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15 #include <linux/delay.h>
16 #include <linux/slab.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/rtnetlink.h>
22 #include <net/mac80211.h>
23 #include <asm/unaligned.h>
24
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
27 #include "rate.h"
28
29 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
30 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
31 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
32
33 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
34 #define IEEE80211_IBSS_MERGE_DELAY 0x400000
35 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
36
37 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
38
39
40 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
41 struct ieee80211_mgmt *mgmt,
42 size_t len)
43 {
44 u16 auth_alg, auth_transaction, status_code;
45
46 lockdep_assert_held(&sdata->u.ibss.mtx);
47
48 if (len < 24 + 6)
49 return;
50
51 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
52 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
53 status_code = le16_to_cpu(mgmt->u.auth.status_code);
54
55 /*
56 * IEEE 802.11 standard does not require authentication in IBSS
57 * networks and most implementations do not seem to use it.
58 * However, try to reply to authentication attempts if someone
59 * has actually implemented this.
60 */
61 if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1)
62 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
63 sdata->u.ibss.bssid, NULL, 0, 0);
64 }
65
66 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
67 const u8 *bssid, const int beacon_int,
68 struct ieee80211_channel *chan,
69 const u32 basic_rates,
70 const u16 capability, u64 tsf)
71 {
72 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
73 struct ieee80211_local *local = sdata->local;
74 int rates, i;
75 struct sk_buff *skb;
76 struct ieee80211_mgmt *mgmt;
77 u8 *pos;
78 struct ieee80211_supported_band *sband;
79 struct cfg80211_bss *bss;
80 u32 bss_change;
81 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
82
83 lockdep_assert_held(&ifibss->mtx);
84
85 /* Reset own TSF to allow time synchronization work. */
86 drv_reset_tsf(local);
87
88 skb = ifibss->skb;
89 rcu_assign_pointer(ifibss->presp, NULL);
90 synchronize_rcu();
91 skb->data = skb->head;
92 skb->len = 0;
93 skb_reset_tail_pointer(skb);
94 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
95
96 if (memcmp(ifibss->bssid, bssid, ETH_ALEN))
97 sta_info_flush(sdata->local, sdata);
98
99 /* if merging, indicate to driver that we leave the old IBSS */
100 if (sdata->vif.bss_conf.ibss_joined) {
101 sdata->vif.bss_conf.ibss_joined = false;
102 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS);
103 }
104
105 memcpy(ifibss->bssid, bssid, ETH_ALEN);
106
107 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
108
109 local->oper_channel = chan;
110 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
111 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
112
113 sband = local->hw.wiphy->bands[chan->band];
114
115 /* build supported rates array */
116 pos = supp_rates;
117 for (i = 0; i < sband->n_bitrates; i++) {
118 int rate = sband->bitrates[i].bitrate;
119 u8 basic = 0;
120 if (basic_rates & BIT(i))
121 basic = 0x80;
122 *pos++ = basic | (u8) (rate / 5);
123 }
124
125 /* Build IBSS probe response */
126 mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
127 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
128 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
129 IEEE80211_STYPE_PROBE_RESP);
130 memset(mgmt->da, 0xff, ETH_ALEN);
131 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
132 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
133 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
134 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
135 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
136
137 pos = skb_put(skb, 2 + ifibss->ssid_len);
138 *pos++ = WLAN_EID_SSID;
139 *pos++ = ifibss->ssid_len;
140 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
141
142 rates = sband->n_bitrates;
143 if (rates > 8)
144 rates = 8;
145 pos = skb_put(skb, 2 + rates);
146 *pos++ = WLAN_EID_SUPP_RATES;
147 *pos++ = rates;
148 memcpy(pos, supp_rates, rates);
149
150 if (sband->band == IEEE80211_BAND_2GHZ) {
151 pos = skb_put(skb, 2 + 1);
152 *pos++ = WLAN_EID_DS_PARAMS;
153 *pos++ = 1;
154 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
155 }
156
157 pos = skb_put(skb, 2 + 2);
158 *pos++ = WLAN_EID_IBSS_PARAMS;
159 *pos++ = 2;
160 /* FIX: set ATIM window based on scan results */
161 *pos++ = 0;
162 *pos++ = 0;
163
164 if (sband->n_bitrates > 8) {
165 rates = sband->n_bitrates - 8;
166 pos = skb_put(skb, 2 + rates);
167 *pos++ = WLAN_EID_EXT_SUPP_RATES;
168 *pos++ = rates;
169 memcpy(pos, &supp_rates[8], rates);
170 }
171
172 if (ifibss->ie_len)
173 memcpy(skb_put(skb, ifibss->ie_len),
174 ifibss->ie, ifibss->ie_len);
175
176 if (local->hw.queues >= 4) {
177 pos = skb_put(skb, 9);
178 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
179 *pos++ = 7; /* len */
180 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
181 *pos++ = 0x50;
182 *pos++ = 0xf2;
183 *pos++ = 2; /* WME */
184 *pos++ = 0; /* WME info */
185 *pos++ = 1; /* WME ver */
186 *pos++ = 0; /* U-APSD no in use */
187 }
188
189 rcu_assign_pointer(ifibss->presp, skb);
190
191 sdata->vif.bss_conf.beacon_int = beacon_int;
192 sdata->vif.bss_conf.basic_rates = basic_rates;
193 bss_change = BSS_CHANGED_BEACON_INT;
194 bss_change |= ieee80211_reset_erp_info(sdata);
195 bss_change |= BSS_CHANGED_BSSID;
196 bss_change |= BSS_CHANGED_BEACON;
197 bss_change |= BSS_CHANGED_BEACON_ENABLED;
198 bss_change |= BSS_CHANGED_BASIC_RATES;
199 bss_change |= BSS_CHANGED_IBSS;
200 sdata->vif.bss_conf.ibss_joined = true;
201 ieee80211_bss_info_change_notify(sdata, bss_change);
202
203 ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
204
205 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
206 mod_timer(&ifibss->timer,
207 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
208
209 bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
210 mgmt, skb->len, 0, GFP_KERNEL);
211 cfg80211_put_bss(bss);
212 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
213 }
214
215 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
216 struct ieee80211_bss *bss)
217 {
218 struct cfg80211_bss *cbss =
219 container_of((void *)bss, struct cfg80211_bss, priv);
220 struct ieee80211_supported_band *sband;
221 u32 basic_rates;
222 int i, j;
223 u16 beacon_int = cbss->beacon_interval;
224
225 lockdep_assert_held(&sdata->u.ibss.mtx);
226
227 if (beacon_int < 10)
228 beacon_int = 10;
229
230 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
231
232 basic_rates = 0;
233
234 for (i = 0; i < bss->supp_rates_len; i++) {
235 int rate = (bss->supp_rates[i] & 0x7f) * 5;
236 bool is_basic = !!(bss->supp_rates[i] & 0x80);
237
238 for (j = 0; j < sband->n_bitrates; j++) {
239 if (sband->bitrates[j].bitrate == rate) {
240 if (is_basic)
241 basic_rates |= BIT(j);
242 break;
243 }
244 }
245 }
246
247 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
248 beacon_int,
249 cbss->channel,
250 basic_rates,
251 cbss->capability,
252 cbss->tsf);
253 }
254
255 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
256 struct ieee80211_mgmt *mgmt,
257 size_t len,
258 struct ieee80211_rx_status *rx_status,
259 struct ieee802_11_elems *elems,
260 bool beacon)
261 {
262 struct ieee80211_local *local = sdata->local;
263 int freq;
264 struct cfg80211_bss *cbss;
265 struct ieee80211_bss *bss;
266 struct sta_info *sta;
267 struct ieee80211_channel *channel;
268 u64 beacon_timestamp, rx_timestamp;
269 u32 supp_rates = 0;
270 enum ieee80211_band band = rx_status->band;
271
272 if (elems->ds_params && elems->ds_params_len == 1)
273 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
274 band);
275 else
276 freq = rx_status->freq;
277
278 channel = ieee80211_get_channel(local->hw.wiphy, freq);
279
280 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
281 return;
282
283 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
284 memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) {
285
286 rcu_read_lock();
287 sta = sta_info_get(sdata, mgmt->sa);
288
289 if (elems->supp_rates) {
290 supp_rates = ieee80211_sta_get_rates(local, elems,
291 band);
292 if (sta) {
293 u32 prev_rates;
294
295 prev_rates = sta->sta.supp_rates[band];
296 /* make sure mandatory rates are always added */
297 sta->sta.supp_rates[band] = supp_rates |
298 ieee80211_mandatory_rates(local, band);
299
300 if (sta->sta.supp_rates[band] != prev_rates) {
301 #ifdef CONFIG_MAC80211_IBSS_DEBUG
302 printk(KERN_DEBUG
303 "%s: updated supp_rates set "
304 "for %pM based on beacon"
305 "/probe_resp (0x%x -> 0x%x)\n",
306 sdata->name, sta->sta.addr,
307 prev_rates,
308 sta->sta.supp_rates[band]);
309 #endif
310 rate_control_rate_init(sta);
311 }
312 } else
313 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
314 mgmt->sa, supp_rates,
315 GFP_ATOMIC);
316 }
317
318 if (sta && elems->wmm_info)
319 set_sta_flags(sta, WLAN_STA_WME);
320
321 rcu_read_unlock();
322 }
323
324 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
325 channel, beacon);
326 if (!bss)
327 return;
328
329 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
330
331 /* was just updated in ieee80211_bss_info_update */
332 beacon_timestamp = cbss->tsf;
333
334 /* check if we need to merge IBSS */
335
336 /* we use a fixed BSSID */
337 if (sdata->u.ibss.fixed_bssid)
338 goto put_bss;
339
340 /* not an IBSS */
341 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
342 goto put_bss;
343
344 /* different channel */
345 if (cbss->channel != local->oper_channel)
346 goto put_bss;
347
348 /* different SSID */
349 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
350 memcmp(elems->ssid, sdata->u.ibss.ssid,
351 sdata->u.ibss.ssid_len))
352 goto put_bss;
353
354 /* same BSSID */
355 if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0)
356 goto put_bss;
357
358 if (rx_status->flag & RX_FLAG_TSFT) {
359 /*
360 * For correct IBSS merging we need mactime; since mactime is
361 * defined as the time the first data symbol of the frame hits
362 * the PHY, and the timestamp of the beacon is defined as "the
363 * time that the data symbol containing the first bit of the
364 * timestamp is transmitted to the PHY plus the transmitting
365 * STA's delays through its local PHY from the MAC-PHY
366 * interface to its interface with the WM" (802.11 11.1.2)
367 * - equals the time this bit arrives at the receiver - we have
368 * to take into account the offset between the two.
369 *
370 * E.g. at 1 MBit that means mactime is 192 usec earlier
371 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
372 */
373 int rate;
374
375 if (rx_status->flag & RX_FLAG_HT)
376 rate = 65; /* TODO: HT rates */
377 else
378 rate = local->hw.wiphy->bands[band]->
379 bitrates[rx_status->rate_idx].bitrate;
380
381 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
382 } else {
383 /*
384 * second best option: get current TSF
385 * (will return -1 if not supported)
386 */
387 rx_timestamp = drv_get_tsf(local);
388 }
389
390 #ifdef CONFIG_MAC80211_IBSS_DEBUG
391 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
392 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
393 mgmt->sa, mgmt->bssid,
394 (unsigned long long)rx_timestamp,
395 (unsigned long long)beacon_timestamp,
396 (unsigned long long)(rx_timestamp - beacon_timestamp),
397 jiffies);
398 #endif
399
400 /* give slow hardware some time to do the TSF sync */
401 if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY)
402 goto put_bss;
403
404 if (beacon_timestamp > rx_timestamp) {
405 #ifdef CONFIG_MAC80211_IBSS_DEBUG
406 printk(KERN_DEBUG "%s: beacon TSF higher than "
407 "local TSF - IBSS merge with BSSID %pM\n",
408 sdata->name, mgmt->bssid);
409 #endif
410 ieee80211_sta_join_ibss(sdata, bss);
411 supp_rates = ieee80211_sta_get_rates(local, elems, band);
412 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
413 supp_rates, GFP_KERNEL);
414 }
415
416 put_bss:
417 ieee80211_rx_bss_put(local, bss);
418 }
419
420 /*
421 * Add a new IBSS station, will also be called by the RX code when,
422 * in IBSS mode, receiving a frame from a yet-unknown station, hence
423 * must be callable in atomic context.
424 */
425 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
426 u8 *bssid,u8 *addr, u32 supp_rates,
427 gfp_t gfp)
428 {
429 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
430 struct ieee80211_local *local = sdata->local;
431 struct sta_info *sta;
432 int band = local->hw.conf.channel->band;
433
434 /*
435 * XXX: Consider removing the least recently used entry and
436 * allow new one to be added.
437 */
438 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
439 if (net_ratelimit())
440 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
441 sdata->name, addr);
442 return NULL;
443 }
444
445 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
446 return NULL;
447
448 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
449 return NULL;
450
451 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
452 wiphy_debug(local->hw.wiphy, "Adding new IBSS station %pM (dev=%s)\n",
453 addr, sdata->name);
454 #endif
455
456 sta = sta_info_alloc(sdata, addr, gfp);
457 if (!sta)
458 return NULL;
459
460 sta->last_rx = jiffies;
461 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
462
463 /* make sure mandatory rates are always added */
464 sta->sta.supp_rates[band] = supp_rates |
465 ieee80211_mandatory_rates(local, band);
466
467 rate_control_rate_init(sta);
468
469 /* If it fails, maybe we raced another insertion? */
470 if (sta_info_insert(sta))
471 return sta_info_get(sdata, addr);
472 return sta;
473 }
474
475 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
476 {
477 struct ieee80211_local *local = sdata->local;
478 int active = 0;
479 struct sta_info *sta;
480
481 lockdep_assert_held(&sdata->u.ibss.mtx);
482
483 rcu_read_lock();
484
485 list_for_each_entry_rcu(sta, &local->sta_list, list) {
486 if (sta->sdata == sdata &&
487 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
488 jiffies)) {
489 active++;
490 break;
491 }
492 }
493
494 rcu_read_unlock();
495
496 return active;
497 }
498
499 /*
500 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
501 */
502
503 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
504 {
505 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
506
507 lockdep_assert_held(&ifibss->mtx);
508
509 mod_timer(&ifibss->timer,
510 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
511
512 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
513
514 if (time_before(jiffies, ifibss->last_scan_completed +
515 IEEE80211_IBSS_MERGE_INTERVAL))
516 return;
517
518 if (ieee80211_sta_active_ibss(sdata))
519 return;
520
521 if (ifibss->fixed_channel)
522 return;
523
524 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
525 "IBSS networks with same SSID (merge)\n", sdata->name);
526
527 ieee80211_request_internal_scan(sdata,
528 ifibss->ssid, ifibss->ssid_len,
529 ifibss->fixed_channel ? ifibss->channel : NULL);
530 }
531
532 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
533 {
534 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
535 struct ieee80211_local *local = sdata->local;
536 struct ieee80211_supported_band *sband;
537 u8 bssid[ETH_ALEN];
538 u16 capability;
539 int i;
540
541 lockdep_assert_held(&ifibss->mtx);
542
543 if (ifibss->fixed_bssid) {
544 memcpy(bssid, ifibss->bssid, ETH_ALEN);
545 } else {
546 /* Generate random, not broadcast, locally administered BSSID. Mix in
547 * own MAC address to make sure that devices that do not have proper
548 * random number generator get different BSSID. */
549 get_random_bytes(bssid, ETH_ALEN);
550 for (i = 0; i < ETH_ALEN; i++)
551 bssid[i] ^= sdata->vif.addr[i];
552 bssid[0] &= ~0x01;
553 bssid[0] |= 0x02;
554 }
555
556 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
557 sdata->name, bssid);
558
559 sband = local->hw.wiphy->bands[ifibss->channel->band];
560
561 capability = WLAN_CAPABILITY_IBSS;
562
563 if (ifibss->privacy)
564 capability |= WLAN_CAPABILITY_PRIVACY;
565 else
566 sdata->drop_unencrypted = 0;
567
568 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
569 ifibss->channel, ifibss->basic_rates,
570 capability, 0);
571 }
572
573 /*
574 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
575 */
576
577 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
578 {
579 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
580 struct ieee80211_local *local = sdata->local;
581 struct cfg80211_bss *cbss;
582 struct ieee80211_channel *chan = NULL;
583 const u8 *bssid = NULL;
584 int active_ibss;
585 u16 capability;
586
587 lockdep_assert_held(&ifibss->mtx);
588
589 active_ibss = ieee80211_sta_active_ibss(sdata);
590 #ifdef CONFIG_MAC80211_IBSS_DEBUG
591 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
592 sdata->name, active_ibss);
593 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
594
595 if (active_ibss)
596 return;
597
598 capability = WLAN_CAPABILITY_IBSS;
599 if (ifibss->privacy)
600 capability |= WLAN_CAPABILITY_PRIVACY;
601 if (ifibss->fixed_bssid)
602 bssid = ifibss->bssid;
603 if (ifibss->fixed_channel)
604 chan = ifibss->channel;
605 if (!is_zero_ether_addr(ifibss->bssid))
606 bssid = ifibss->bssid;
607 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
608 ifibss->ssid, ifibss->ssid_len,
609 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
610 capability);
611
612 if (cbss) {
613 struct ieee80211_bss *bss;
614
615 bss = (void *)cbss->priv;
616 #ifdef CONFIG_MAC80211_IBSS_DEBUG
617 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
618 "%pM\n", cbss->bssid, ifibss->bssid);
619 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
620
621 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
622 " based on configured SSID\n",
623 sdata->name, cbss->bssid);
624
625 ieee80211_sta_join_ibss(sdata, bss);
626 ieee80211_rx_bss_put(local, bss);
627 return;
628 }
629
630 #ifdef CONFIG_MAC80211_IBSS_DEBUG
631 printk(KERN_DEBUG " did not try to join ibss\n");
632 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
633
634 /* Selected IBSS not found in current scan results - try to scan */
635 if (time_after(jiffies, ifibss->last_scan_completed +
636 IEEE80211_SCAN_INTERVAL)) {
637 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
638 "join\n", sdata->name);
639
640 ieee80211_request_internal_scan(sdata,
641 ifibss->ssid, ifibss->ssid_len,
642 ifibss->fixed_channel ? ifibss->channel : NULL);
643 } else {
644 int interval = IEEE80211_SCAN_INTERVAL;
645
646 if (time_after(jiffies, ifibss->ibss_join_req +
647 IEEE80211_IBSS_JOIN_TIMEOUT)) {
648 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
649 ieee80211_sta_create_ibss(sdata);
650 return;
651 }
652 printk(KERN_DEBUG "%s: IBSS not allowed on"
653 " %d MHz\n", sdata->name,
654 local->hw.conf.channel->center_freq);
655
656 /* No IBSS found - decrease scan interval and continue
657 * scanning. */
658 interval = IEEE80211_SCAN_INTERVAL_SLOW;
659 }
660
661 mod_timer(&ifibss->timer,
662 round_jiffies(jiffies + interval));
663 }
664 }
665
666 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
667 struct ieee80211_mgmt *mgmt,
668 size_t len)
669 {
670 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
671 struct ieee80211_local *local = sdata->local;
672 int tx_last_beacon;
673 struct sk_buff *skb;
674 struct ieee80211_mgmt *resp;
675 u8 *pos, *end;
676
677 lockdep_assert_held(&ifibss->mtx);
678
679 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
680 len < 24 + 2 || !ifibss->presp)
681 return;
682
683 tx_last_beacon = drv_tx_last_beacon(local);
684
685 #ifdef CONFIG_MAC80211_IBSS_DEBUG
686 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
687 " (tx_last_beacon=%d)\n",
688 sdata->name, mgmt->sa, mgmt->da,
689 mgmt->bssid, tx_last_beacon);
690 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
691
692 if (!tx_last_beacon)
693 return;
694
695 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
696 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
697 return;
698
699 end = ((u8 *) mgmt) + len;
700 pos = mgmt->u.probe_req.variable;
701 if (pos[0] != WLAN_EID_SSID ||
702 pos + 2 + pos[1] > end) {
703 #ifdef CONFIG_MAC80211_IBSS_DEBUG
704 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
705 "from %pM\n",
706 sdata->name, mgmt->sa);
707 #endif
708 return;
709 }
710 if (pos[1] != 0 &&
711 (pos[1] != ifibss->ssid_len ||
712 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
713 /* Ignore ProbeReq for foreign SSID */
714 return;
715 }
716
717 /* Reply with ProbeResp */
718 skb = skb_copy(ifibss->presp, GFP_KERNEL);
719 if (!skb)
720 return;
721
722 resp = (struct ieee80211_mgmt *) skb->data;
723 memcpy(resp->da, mgmt->sa, ETH_ALEN);
724 #ifdef CONFIG_MAC80211_IBSS_DEBUG
725 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
726 sdata->name, resp->da);
727 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
728 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
729 ieee80211_tx_skb(sdata, skb);
730 }
731
732 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
733 struct ieee80211_mgmt *mgmt,
734 size_t len,
735 struct ieee80211_rx_status *rx_status)
736 {
737 size_t baselen;
738 struct ieee802_11_elems elems;
739
740 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
741 return; /* ignore ProbeResp to foreign address */
742
743 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
744 if (baselen > len)
745 return;
746
747 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
748 &elems);
749
750 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
751 }
752
753 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
754 struct ieee80211_mgmt *mgmt,
755 size_t len,
756 struct ieee80211_rx_status *rx_status)
757 {
758 size_t baselen;
759 struct ieee802_11_elems elems;
760
761 /* Process beacon from the current BSS */
762 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
763 if (baselen > len)
764 return;
765
766 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
767
768 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
769 }
770
771 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
772 struct sk_buff *skb)
773 {
774 struct ieee80211_rx_status *rx_status;
775 struct ieee80211_mgmt *mgmt;
776 u16 fc;
777
778 rx_status = IEEE80211_SKB_RXCB(skb);
779 mgmt = (struct ieee80211_mgmt *) skb->data;
780 fc = le16_to_cpu(mgmt->frame_control);
781
782 mutex_lock(&sdata->u.ibss.mtx);
783
784 if (!sdata->u.ibss.ssid_len)
785 goto mgmt_out; /* not ready to merge yet */
786
787 switch (fc & IEEE80211_FCTL_STYPE) {
788 case IEEE80211_STYPE_PROBE_REQ:
789 ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len);
790 break;
791 case IEEE80211_STYPE_PROBE_RESP:
792 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
793 rx_status);
794 break;
795 case IEEE80211_STYPE_BEACON:
796 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
797 rx_status);
798 break;
799 case IEEE80211_STYPE_AUTH:
800 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
801 break;
802 }
803
804 mgmt_out:
805 mutex_unlock(&sdata->u.ibss.mtx);
806 }
807
808 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
809 {
810 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
811
812 mutex_lock(&ifibss->mtx);
813
814 /*
815 * Work could be scheduled after scan or similar
816 * when we aren't even joined (or trying) with a
817 * network.
818 */
819 if (!ifibss->ssid_len)
820 goto out;
821
822 switch (ifibss->state) {
823 case IEEE80211_IBSS_MLME_SEARCH:
824 ieee80211_sta_find_ibss(sdata);
825 break;
826 case IEEE80211_IBSS_MLME_JOINED:
827 ieee80211_sta_merge_ibss(sdata);
828 break;
829 default:
830 WARN_ON(1);
831 break;
832 }
833
834 out:
835 mutex_unlock(&ifibss->mtx);
836 }
837
838 static void ieee80211_ibss_timer(unsigned long data)
839 {
840 struct ieee80211_sub_if_data *sdata =
841 (struct ieee80211_sub_if_data *) data;
842 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
843 struct ieee80211_local *local = sdata->local;
844
845 if (local->quiescing) {
846 ifibss->timer_running = true;
847 return;
848 }
849
850 ieee80211_queue_work(&local->hw, &sdata->work);
851 }
852
853 #ifdef CONFIG_PM
854 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
855 {
856 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
857
858 if (del_timer_sync(&ifibss->timer))
859 ifibss->timer_running = true;
860 }
861
862 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
863 {
864 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
865
866 if (ifibss->timer_running) {
867 add_timer(&ifibss->timer);
868 ifibss->timer_running = false;
869 }
870 }
871 #endif
872
873 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
874 {
875 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
876
877 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
878 (unsigned long) sdata);
879 mutex_init(&ifibss->mtx);
880 }
881
882 /* scan finished notification */
883 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
884 {
885 struct ieee80211_sub_if_data *sdata;
886
887 mutex_lock(&local->iflist_mtx);
888 list_for_each_entry(sdata, &local->interfaces, list) {
889 if (!ieee80211_sdata_running(sdata))
890 continue;
891 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
892 continue;
893 sdata->u.ibss.last_scan_completed = jiffies;
894 ieee80211_queue_work(&local->hw, &sdata->work);
895 }
896 mutex_unlock(&local->iflist_mtx);
897 }
898
899 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
900 struct cfg80211_ibss_params *params)
901 {
902 struct sk_buff *skb;
903
904 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
905 36 /* bitrates */ +
906 34 /* SSID */ +
907 3 /* DS params */ +
908 4 /* IBSS params */ +
909 params->ie_len);
910 if (!skb)
911 return -ENOMEM;
912
913 mutex_lock(&sdata->u.ibss.mtx);
914
915 if (params->bssid) {
916 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
917 sdata->u.ibss.fixed_bssid = true;
918 } else
919 sdata->u.ibss.fixed_bssid = false;
920
921 sdata->u.ibss.privacy = params->privacy;
922 sdata->u.ibss.basic_rates = params->basic_rates;
923 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
924 sizeof(params->mcast_rate));
925
926 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
927
928 sdata->u.ibss.channel = params->channel;
929 sdata->u.ibss.fixed_channel = params->channel_fixed;
930
931 /* fix ourselves to that channel now already */
932 if (params->channel_fixed) {
933 sdata->local->oper_channel = params->channel;
934 WARN_ON(!ieee80211_set_channel_type(sdata->local, sdata,
935 NL80211_CHAN_NO_HT));
936 }
937
938 if (params->ie) {
939 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
940 GFP_KERNEL);
941 if (sdata->u.ibss.ie)
942 sdata->u.ibss.ie_len = params->ie_len;
943 }
944
945 sdata->u.ibss.skb = skb;
946 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
947 sdata->u.ibss.ibss_join_req = jiffies;
948
949 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
950 sdata->u.ibss.ssid_len = params->ssid_len;
951
952 mutex_unlock(&sdata->u.ibss.mtx);
953
954 mutex_lock(&sdata->local->mtx);
955 ieee80211_recalc_idle(sdata->local);
956 mutex_unlock(&sdata->local->mtx);
957
958 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
959
960 return 0;
961 }
962
963 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
964 {
965 struct sk_buff *skb;
966 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
967 struct ieee80211_local *local = sdata->local;
968 struct cfg80211_bss *cbss;
969 u16 capability;
970 int active_ibss;
971
972 mutex_lock(&sdata->u.ibss.mtx);
973
974 active_ibss = ieee80211_sta_active_ibss(sdata);
975
976 if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
977 capability = WLAN_CAPABILITY_IBSS;
978
979 if (ifibss->privacy)
980 capability |= WLAN_CAPABILITY_PRIVACY;
981
982 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
983 ifibss->bssid, ifibss->ssid,
984 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
985 WLAN_CAPABILITY_PRIVACY,
986 capability);
987
988 if (cbss) {
989 cfg80211_unlink_bss(local->hw.wiphy, cbss);
990 cfg80211_put_bss(cbss);
991 }
992 }
993
994 sta_info_flush(sdata->local, sdata);
995
996 /* remove beacon */
997 kfree(sdata->u.ibss.ie);
998 skb = sdata->u.ibss.presp;
999 rcu_assign_pointer(sdata->u.ibss.presp, NULL);
1000 sdata->vif.bss_conf.ibss_joined = false;
1001 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1002 BSS_CHANGED_IBSS);
1003 synchronize_rcu();
1004 kfree_skb(skb);
1005
1006 skb_queue_purge(&sdata->skb_queue);
1007 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
1008 sdata->u.ibss.ssid_len = 0;
1009
1010 del_timer_sync(&sdata->u.ibss.timer);
1011
1012 mutex_unlock(&sdata->u.ibss.mtx);
1013
1014 mutex_lock(&local->mtx);
1015 ieee80211_recalc_idle(sdata->local);
1016 mutex_unlock(&local->mtx);
1017
1018 return 0;
1019 }
WandBoard kernel