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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / net / mac80211 / ibss.c
blobede9a8b341acadd2c2a491b1277a585f68eaea19
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_INACTIVITY_LIMIT (60 * HZ)
35
36 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
37
38
39 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
40 struct ieee80211_mgmt *mgmt,
41 size_t len)
42 {
43 u16 auth_alg, auth_transaction;
44
45 lockdep_assert_held(&sdata->u.ibss.mtx);
46
47 if (len < 24 + 6)
48 return;
49
50 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
51 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
52
53 /*
54 * IEEE 802.11 standard does not require authentication in IBSS
55 * networks and most implementations do not seem to use it.
56 * However, try to reply to authentication attempts if someone
57 * has actually implemented this.
58 */
59 if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1)
60 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
61 sdata->u.ibss.bssid, NULL, 0, 0);
62 }
63
64 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
65 const u8 *bssid, const int beacon_int,
66 struct ieee80211_channel *chan,
67 const u32 basic_rates,
68 const u16 capability, u64 tsf)
69 {
70 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
71 struct ieee80211_local *local = sdata->local;
72 int rates, i;
73 struct sk_buff *skb;
74 struct ieee80211_mgmt *mgmt;
75 u8 *pos;
76 struct ieee80211_supported_band *sband;
77 struct cfg80211_bss *bss;
78 u32 bss_change;
79 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
80
81 lockdep_assert_held(&ifibss->mtx);
82
83 /* Reset own TSF to allow time synchronization work. */
84 drv_reset_tsf(local, sdata);
85
86 skb = ifibss->skb;
87 RCU_INIT_POINTER(ifibss->presp, NULL);
88 synchronize_rcu();
89 skb->data = skb->head;
90 skb->len = 0;
91 skb_reset_tail_pointer(skb);
92 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
93
94 if (memcmp(ifibss->bssid, bssid, ETH_ALEN))
95 sta_info_flush(sdata->local, sdata);
96
97 /* if merging, indicate to driver that we leave the old IBSS */
98 if (sdata->vif.bss_conf.ibss_joined) {
99 sdata->vif.bss_conf.ibss_joined = false;
100 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS);
101 }
102
103 memcpy(ifibss->bssid, bssid, ETH_ALEN);
104
105 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
106
107 local->oper_channel = chan;
108 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
109 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
110
111 sband = local->hw.wiphy->bands[chan->band];
112
113 /* build supported rates array */
114 pos = supp_rates;
115 for (i = 0; i < sband->n_bitrates; i++) {
116 int rate = sband->bitrates[i].bitrate;
117 u8 basic = 0;
118 if (basic_rates & BIT(i))
119 basic = 0x80;
120 *pos++ = basic | (u8) (rate / 5);
121 }
122
123 /* Build IBSS probe response */
124 mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
125 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
126 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
127 IEEE80211_STYPE_PROBE_RESP);
128 memset(mgmt->da, 0xff, ETH_ALEN);
129 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
130 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
131 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
132 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
133 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
134
135 pos = skb_put(skb, 2 + ifibss->ssid_len);
136 *pos++ = WLAN_EID_SSID;
137 *pos++ = ifibss->ssid_len;
138 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
139
140 rates = sband->n_bitrates;
141 if (rates > 8)
142 rates = 8;
143 pos = skb_put(skb, 2 + rates);
144 *pos++ = WLAN_EID_SUPP_RATES;
145 *pos++ = rates;
146 memcpy(pos, supp_rates, rates);
147
148 if (sband->band == IEEE80211_BAND_2GHZ) {
149 pos = skb_put(skb, 2 + 1);
150 *pos++ = WLAN_EID_DS_PARAMS;
151 *pos++ = 1;
152 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
153 }
154
155 pos = skb_put(skb, 2 + 2);
156 *pos++ = WLAN_EID_IBSS_PARAMS;
157 *pos++ = 2;
158 /* FIX: set ATIM window based on scan results */
159 *pos++ = 0;
160 *pos++ = 0;
161
162 if (sband->n_bitrates > 8) {
163 rates = sband->n_bitrates - 8;
164 pos = skb_put(skb, 2 + rates);
165 *pos++ = WLAN_EID_EXT_SUPP_RATES;
166 *pos++ = rates;
167 memcpy(pos, &supp_rates[8], rates);
168 }
169
170 if (ifibss->ie_len)
171 memcpy(skb_put(skb, ifibss->ie_len),
172 ifibss->ie, ifibss->ie_len);
173
174 if (local->hw.queues >= 4) {
175 pos = skb_put(skb, 9);
176 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
177 *pos++ = 7; /* len */
178 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
179 *pos++ = 0x50;
180 *pos++ = 0xf2;
181 *pos++ = 2; /* WME */
182 *pos++ = 0; /* WME info */
183 *pos++ = 1; /* WME ver */
184 *pos++ = 0; /* U-APSD no in use */
185 }
186
187 RCU_INIT_POINTER(ifibss->presp, skb);
188
189 sdata->vif.bss_conf.beacon_int = beacon_int;
190 sdata->vif.bss_conf.basic_rates = basic_rates;
191 bss_change = BSS_CHANGED_BEACON_INT;
192 bss_change |= ieee80211_reset_erp_info(sdata);
193 bss_change |= BSS_CHANGED_BSSID;
194 bss_change |= BSS_CHANGED_BEACON;
195 bss_change |= BSS_CHANGED_BEACON_ENABLED;
196 bss_change |= BSS_CHANGED_BASIC_RATES;
197 bss_change |= BSS_CHANGED_IBSS;
198 sdata->vif.bss_conf.ibss_joined = true;
199 ieee80211_bss_info_change_notify(sdata, bss_change);
200
201 ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
202
203 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
204 mod_timer(&ifibss->timer,
205 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
206
207 bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
208 mgmt, skb->len, 0, GFP_KERNEL);
209 cfg80211_put_bss(bss);
210 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
211 }
212
213 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
214 struct ieee80211_bss *bss)
215 {
216 struct cfg80211_bss *cbss =
217 container_of((void *)bss, struct cfg80211_bss, priv);
218 struct ieee80211_supported_band *sband;
219 u32 basic_rates;
220 int i, j;
221 u16 beacon_int = cbss->beacon_interval;
222
223 lockdep_assert_held(&sdata->u.ibss.mtx);
224
225 if (beacon_int < 10)
226 beacon_int = 10;
227
228 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
229
230 basic_rates = 0;
231
232 for (i = 0; i < bss->supp_rates_len; i++) {
233 int rate = (bss->supp_rates[i] & 0x7f) * 5;
234 bool is_basic = !!(bss->supp_rates[i] & 0x80);
235
236 for (j = 0; j < sband->n_bitrates; j++) {
237 if (sband->bitrates[j].bitrate == rate) {
238 if (is_basic)
239 basic_rates |= BIT(j);
240 break;
241 }
242 }
243 }
244
245 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
246 beacon_int,
247 cbss->channel,
248 basic_rates,
249 cbss->capability,
250 cbss->tsf);
251 }
252
253 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
254 struct ieee80211_mgmt *mgmt,
255 size_t len,
256 struct ieee80211_rx_status *rx_status,
257 struct ieee802_11_elems *elems,
258 bool beacon)
259 {
260 struct ieee80211_local *local = sdata->local;
261 int freq;
262 struct cfg80211_bss *cbss;
263 struct ieee80211_bss *bss;
264 struct sta_info *sta;
265 struct ieee80211_channel *channel;
266 u64 beacon_timestamp, rx_timestamp;
267 u32 supp_rates = 0;
268 enum ieee80211_band band = rx_status->band;
269
270 if (elems->ds_params && elems->ds_params_len == 1)
271 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
272 band);
273 else
274 freq = rx_status->freq;
275
276 channel = ieee80211_get_channel(local->hw.wiphy, freq);
277
278 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
279 return;
280
281 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
282 memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) {
283
284 rcu_read_lock();
285 sta = sta_info_get(sdata, mgmt->sa);
286
287 if (elems->supp_rates) {
288 supp_rates = ieee80211_sta_get_rates(local, elems,
289 band);
290 if (sta) {
291 u32 prev_rates;
292
293 prev_rates = sta->sta.supp_rates[band];
294 /* make sure mandatory rates are always added */
295 sta->sta.supp_rates[band] = supp_rates |
296 ieee80211_mandatory_rates(local, band);
297
298 if (sta->sta.supp_rates[band] != prev_rates) {
299 #ifdef CONFIG_MAC80211_IBSS_DEBUG
300 printk(KERN_DEBUG
301 "%s: updated supp_rates set "
302 "for %pM based on beacon"
303 "/probe_resp (0x%x -> 0x%x)\n",
304 sdata->name, sta->sta.addr,
305 prev_rates,
306 sta->sta.supp_rates[band]);
307 #endif
308 rate_control_rate_init(sta);
309 }
310 } else
311 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
312 mgmt->sa, supp_rates,
313 GFP_ATOMIC);
314 }
315
316 if (sta && elems->wmm_info)
317 set_sta_flag(sta, WLAN_STA_WME);
318
319 rcu_read_unlock();
320 }
321
322 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
323 channel, beacon);
324 if (!bss)
325 return;
326
327 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
328
329 /* was just updated in ieee80211_bss_info_update */
330 beacon_timestamp = cbss->tsf;
331
332 /* check if we need to merge IBSS */
333
334 /* we use a fixed BSSID */
335 if (sdata->u.ibss.fixed_bssid)
336 goto put_bss;
337
338 /* not an IBSS */
339 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
340 goto put_bss;
341
342 /* different channel */
343 if (cbss->channel != local->oper_channel)
344 goto put_bss;
345
346 /* different SSID */
347 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
348 memcmp(elems->ssid, sdata->u.ibss.ssid,
349 sdata->u.ibss.ssid_len))
350 goto put_bss;
351
352 /* same BSSID */
353 if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0)
354 goto put_bss;
355
356 if (rx_status->flag & RX_FLAG_MACTIME_MPDU) {
357 /*
358 * For correct IBSS merging we need mactime; since mactime is
359 * defined as the time the first data symbol of the frame hits
360 * the PHY, and the timestamp of the beacon is defined as "the
361 * time that the data symbol containing the first bit of the
362 * timestamp is transmitted to the PHY plus the transmitting
363 * STA's delays through its local PHY from the MAC-PHY
364 * interface to its interface with the WM" (802.11 11.1.2)
365 * - equals the time this bit arrives at the receiver - we have
366 * to take into account the offset between the two.
367 *
368 * E.g. at 1 MBit that means mactime is 192 usec earlier
369 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
370 */
371 int rate;
372
373 if (rx_status->flag & RX_FLAG_HT)
374 rate = 65; /* TODO: HT rates */
375 else
376 rate = local->hw.wiphy->bands[band]->
377 bitrates[rx_status->rate_idx].bitrate;
378
379 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
380 } else {
381 /*
382 * second best option: get current TSF
383 * (will return -1 if not supported)
384 */
385 rx_timestamp = drv_get_tsf(local, sdata);
386 }
387
388 #ifdef CONFIG_MAC80211_IBSS_DEBUG
389 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
390 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
391 mgmt->sa, mgmt->bssid,
392 (unsigned long long)rx_timestamp,
393 (unsigned long long)beacon_timestamp,
394 (unsigned long long)(rx_timestamp - beacon_timestamp),
395 jiffies);
396 #endif
397
398 if (beacon_timestamp > rx_timestamp) {
399 #ifdef CONFIG_MAC80211_IBSS_DEBUG
400 printk(KERN_DEBUG "%s: beacon TSF higher than "
401 "local TSF - IBSS merge with BSSID %pM\n",
402 sdata->name, mgmt->bssid);
403 #endif
404 ieee80211_sta_join_ibss(sdata, bss);
405 supp_rates = ieee80211_sta_get_rates(local, elems, band);
406 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
407 supp_rates, GFP_KERNEL);
408 }
409
410 put_bss:
411 ieee80211_rx_bss_put(local, bss);
412 }
413
414 /*
415 * Add a new IBSS station, will also be called by the RX code when,
416 * in IBSS mode, receiving a frame from a yet-unknown station, hence
417 * must be callable in atomic context.
418 */
419 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
420 u8 *bssid, u8 *addr, u32 supp_rates,
421 gfp_t gfp)
422 {
423 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
424 struct ieee80211_local *local = sdata->local;
425 struct sta_info *sta;
426 int band = local->hw.conf.channel->band;
427
428 /*
429 * XXX: Consider removing the least recently used entry and
430 * allow new one to be added.
431 */
432 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
433 if (net_ratelimit())
434 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
435 sdata->name, addr);
436 return NULL;
437 }
438
439 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
440 return NULL;
441
442 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
443 return NULL;
444
445 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
446 wiphy_debug(local->hw.wiphy, "Adding new IBSS station %pM (dev=%s)\n",
447 addr, sdata->name);
448 #endif
449
450 sta = sta_info_alloc(sdata, addr, gfp);
451 if (!sta)
452 return NULL;
453
454 sta->last_rx = jiffies;
455 set_sta_flag(sta, WLAN_STA_AUTHORIZED);
456
457 /* make sure mandatory rates are always added */
458 sta->sta.supp_rates[band] = supp_rates |
459 ieee80211_mandatory_rates(local, band);
460
461 rate_control_rate_init(sta);
462
463 /* If it fails, maybe we raced another insertion? */
464 if (sta_info_insert(sta))
465 return sta_info_get(sdata, addr);
466 return sta;
467 }
468
469 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
470 {
471 struct ieee80211_local *local = sdata->local;
472 int active = 0;
473 struct sta_info *sta;
474
475 lockdep_assert_held(&sdata->u.ibss.mtx);
476
477 rcu_read_lock();
478
479 list_for_each_entry_rcu(sta, &local->sta_list, list) {
480 if (sta->sdata == sdata &&
481 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
482 jiffies)) {
483 active++;
484 break;
485 }
486 }
487
488 rcu_read_unlock();
489
490 return active;
491 }
492
493 /*
494 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
495 */
496
497 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
498 {
499 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
500
501 lockdep_assert_held(&ifibss->mtx);
502
503 mod_timer(&ifibss->timer,
504 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
505
506 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
507
508 if (time_before(jiffies, ifibss->last_scan_completed +
509 IEEE80211_IBSS_MERGE_INTERVAL))
510 return;
511
512 if (ieee80211_sta_active_ibss(sdata))
513 return;
514
515 if (ifibss->fixed_channel)
516 return;
517
518 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
519 "IBSS networks with same SSID (merge)\n", sdata->name);
520
521 ieee80211_request_internal_scan(sdata,
522 ifibss->ssid, ifibss->ssid_len,
523 ifibss->fixed_channel ? ifibss->channel : NULL);
524 }
525
526 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
527 {
528 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
529 u8 bssid[ETH_ALEN];
530 u16 capability;
531 int i;
532
533 lockdep_assert_held(&ifibss->mtx);
534
535 if (ifibss->fixed_bssid) {
536 memcpy(bssid, ifibss->bssid, ETH_ALEN);
537 } else {
538 /* Generate random, not broadcast, locally administered BSSID. Mix in
539 * own MAC address to make sure that devices that do not have proper
540 * random number generator get different BSSID. */
541 get_random_bytes(bssid, ETH_ALEN);
542 for (i = 0; i < ETH_ALEN; i++)
543 bssid[i] ^= sdata->vif.addr[i];
544 bssid[0] &= ~0x01;
545 bssid[0] |= 0x02;
546 }
547
548 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
549 sdata->name, bssid);
550
551 capability = WLAN_CAPABILITY_IBSS;
552
553 if (ifibss->privacy)
554 capability |= WLAN_CAPABILITY_PRIVACY;
555 else
556 sdata->drop_unencrypted = 0;
557
558 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
559 ifibss->channel, ifibss->basic_rates,
560 capability, 0);
561 }
562
563 /*
564 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
565 */
566
567 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
568 {
569 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
570 struct ieee80211_local *local = sdata->local;
571 struct cfg80211_bss *cbss;
572 struct ieee80211_channel *chan = NULL;
573 const u8 *bssid = NULL;
574 int active_ibss;
575 u16 capability;
576
577 lockdep_assert_held(&ifibss->mtx);
578
579 active_ibss = ieee80211_sta_active_ibss(sdata);
580 #ifdef CONFIG_MAC80211_IBSS_DEBUG
581 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
582 sdata->name, active_ibss);
583 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
584
585 if (active_ibss)
586 return;
587
588 capability = WLAN_CAPABILITY_IBSS;
589 if (ifibss->privacy)
590 capability |= WLAN_CAPABILITY_PRIVACY;
591 if (ifibss->fixed_bssid)
592 bssid = ifibss->bssid;
593 if (ifibss->fixed_channel)
594 chan = ifibss->channel;
595 if (!is_zero_ether_addr(ifibss->bssid))
596 bssid = ifibss->bssid;
597 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
598 ifibss->ssid, ifibss->ssid_len,
599 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
600 capability);
601
602 if (cbss) {
603 struct ieee80211_bss *bss;
604
605 bss = (void *)cbss->priv;
606 #ifdef CONFIG_MAC80211_IBSS_DEBUG
607 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
608 "%pM\n", cbss->bssid, ifibss->bssid);
609 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
610
611 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
612 " based on configured SSID\n",
613 sdata->name, cbss->bssid);
614
615 ieee80211_sta_join_ibss(sdata, bss);
616 ieee80211_rx_bss_put(local, bss);
617 return;
618 }
619
620 #ifdef CONFIG_MAC80211_IBSS_DEBUG
621 printk(KERN_DEBUG " did not try to join ibss\n");
622 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
623
624 /* Selected IBSS not found in current scan results - try to scan */
625 if (time_after(jiffies, ifibss->last_scan_completed +
626 IEEE80211_SCAN_INTERVAL)) {
627 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
628 "join\n", sdata->name);
629
630 ieee80211_request_internal_scan(sdata,
631 ifibss->ssid, ifibss->ssid_len,
632 ifibss->fixed_channel ? ifibss->channel : NULL);
633 } else {
634 int interval = IEEE80211_SCAN_INTERVAL;
635
636 if (time_after(jiffies, ifibss->ibss_join_req +
637 IEEE80211_IBSS_JOIN_TIMEOUT)) {
638 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
639 ieee80211_sta_create_ibss(sdata);
640 return;
641 }
642 printk(KERN_DEBUG "%s: IBSS not allowed on"
643 " %d MHz\n", sdata->name,
644 local->hw.conf.channel->center_freq);
645
646 /* No IBSS found - decrease scan interval and continue
647 * scanning. */
648 interval = IEEE80211_SCAN_INTERVAL_SLOW;
649 }
650
651 mod_timer(&ifibss->timer,
652 round_jiffies(jiffies + interval));
653 }
654 }
655
656 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
657 struct sk_buff *req)
658 {
659 struct ieee80211_mgmt *mgmt = (void *)req->data;
660 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
661 struct ieee80211_local *local = sdata->local;
662 int tx_last_beacon, len = req->len;
663 struct sk_buff *skb;
664 struct ieee80211_mgmt *resp;
665 struct sk_buff *presp;
666 u8 *pos, *end;
667
668 lockdep_assert_held(&ifibss->mtx);
669
670 presp = rcu_dereference_protected(ifibss->presp,
671 lockdep_is_held(&ifibss->mtx));
672
673 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
674 len < 24 + 2 || !presp)
675 return;
676
677 tx_last_beacon = drv_tx_last_beacon(local);
678
679 #ifdef CONFIG_MAC80211_IBSS_DEBUG
680 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
681 " (tx_last_beacon=%d)\n",
682 sdata->name, mgmt->sa, mgmt->da,
683 mgmt->bssid, tx_last_beacon);
684 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
685
686 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
687 return;
688
689 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
690 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
691 return;
692
693 end = ((u8 *) mgmt) + len;
694 pos = mgmt->u.probe_req.variable;
695 if (pos[0] != WLAN_EID_SSID ||
696 pos + 2 + pos[1] > end) {
697 #ifdef CONFIG_MAC80211_IBSS_DEBUG
698 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
699 "from %pM\n",
700 sdata->name, mgmt->sa);
701 #endif
702 return;
703 }
704 if (pos[1] != 0 &&
705 (pos[1] != ifibss->ssid_len ||
706 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
707 /* Ignore ProbeReq for foreign SSID */
708 return;
709 }
710
711 /* Reply with ProbeResp */
712 skb = skb_copy(presp, GFP_KERNEL);
713 if (!skb)
714 return;
715
716 resp = (struct ieee80211_mgmt *) skb->data;
717 memcpy(resp->da, mgmt->sa, ETH_ALEN);
718 #ifdef CONFIG_MAC80211_IBSS_DEBUG
719 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
720 sdata->name, resp->da);
721 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
722 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
723 ieee80211_tx_skb(sdata, skb);
724 }
725
726 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
727 struct ieee80211_mgmt *mgmt,
728 size_t len,
729 struct ieee80211_rx_status *rx_status)
730 {
731 size_t baselen;
732 struct ieee802_11_elems elems;
733
734 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
735 return; /* ignore ProbeResp to foreign address */
736
737 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
738 if (baselen > len)
739 return;
740
741 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
742 &elems);
743
744 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
745 }
746
747 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
748 struct ieee80211_mgmt *mgmt,
749 size_t len,
750 struct ieee80211_rx_status *rx_status)
751 {
752 size_t baselen;
753 struct ieee802_11_elems elems;
754
755 /* Process beacon from the current BSS */
756 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
757 if (baselen > len)
758 return;
759
760 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
761
762 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
763 }
764
765 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
766 struct sk_buff *skb)
767 {
768 struct ieee80211_rx_status *rx_status;
769 struct ieee80211_mgmt *mgmt;
770 u16 fc;
771
772 rx_status = IEEE80211_SKB_RXCB(skb);
773 mgmt = (struct ieee80211_mgmt *) skb->data;
774 fc = le16_to_cpu(mgmt->frame_control);
775
776 mutex_lock(&sdata->u.ibss.mtx);
777
778 if (!sdata->u.ibss.ssid_len)
779 goto mgmt_out; /* not ready to merge yet */
780
781 switch (fc & IEEE80211_FCTL_STYPE) {
782 case IEEE80211_STYPE_PROBE_REQ:
783 ieee80211_rx_mgmt_probe_req(sdata, skb);
784 break;
785 case IEEE80211_STYPE_PROBE_RESP:
786 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
787 rx_status);
788 break;
789 case IEEE80211_STYPE_BEACON:
790 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
791 rx_status);
792 break;
793 case IEEE80211_STYPE_AUTH:
794 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
795 break;
796 }
797
798 mgmt_out:
799 mutex_unlock(&sdata->u.ibss.mtx);
800 }
801
802 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
803 {
804 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
805
806 mutex_lock(&ifibss->mtx);
807
808 /*
809 * Work could be scheduled after scan or similar
810 * when we aren't even joined (or trying) with a
811 * network.
812 */
813 if (!ifibss->ssid_len)
814 goto out;
815
816 switch (ifibss->state) {
817 case IEEE80211_IBSS_MLME_SEARCH:
818 ieee80211_sta_find_ibss(sdata);
819 break;
820 case IEEE80211_IBSS_MLME_JOINED:
821 ieee80211_sta_merge_ibss(sdata);
822 break;
823 default:
824 WARN_ON(1);
825 break;
826 }
827
828 out:
829 mutex_unlock(&ifibss->mtx);
830 }
831
832 static void ieee80211_ibss_timer(unsigned long data)
833 {
834 struct ieee80211_sub_if_data *sdata =
835 (struct ieee80211_sub_if_data *) data;
836 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
837 struct ieee80211_local *local = sdata->local;
838
839 if (local->quiescing) {
840 ifibss->timer_running = true;
841 return;
842 }
843
844 ieee80211_queue_work(&local->hw, &sdata->work);
845 }
846
847 #ifdef CONFIG_PM
848 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
849 {
850 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
851
852 if (del_timer_sync(&ifibss->timer))
853 ifibss->timer_running = true;
854 }
855
856 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
857 {
858 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
859
860 if (ifibss->timer_running) {
861 add_timer(&ifibss->timer);
862 ifibss->timer_running = false;
863 }
864 }
865 #endif
866
867 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
868 {
869 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
870
871 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
872 (unsigned long) sdata);
873 mutex_init(&ifibss->mtx);
874 }
875
876 /* scan finished notification */
877 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
878 {
879 struct ieee80211_sub_if_data *sdata;
880
881 mutex_lock(&local->iflist_mtx);
882 list_for_each_entry(sdata, &local->interfaces, list) {
883 if (!ieee80211_sdata_running(sdata))
884 continue;
885 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
886 continue;
887 sdata->u.ibss.last_scan_completed = jiffies;
888 ieee80211_queue_work(&local->hw, &sdata->work);
889 }
890 mutex_unlock(&local->iflist_mtx);
891 }
892
893 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
894 struct cfg80211_ibss_params *params)
895 {
896 struct sk_buff *skb;
897
898 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
899 36 /* bitrates */ +
900 34 /* SSID */ +
901 3 /* DS params */ +
902 4 /* IBSS params */ +
903 params->ie_len);
904 if (!skb)
905 return -ENOMEM;
906
907 mutex_lock(&sdata->u.ibss.mtx);
908
909 if (params->bssid) {
910 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
911 sdata->u.ibss.fixed_bssid = true;
912 } else
913 sdata->u.ibss.fixed_bssid = false;
914
915 sdata->u.ibss.privacy = params->privacy;
916 sdata->u.ibss.basic_rates = params->basic_rates;
917 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
918 sizeof(params->mcast_rate));
919
920 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
921
922 sdata->u.ibss.channel = params->channel;
923 sdata->u.ibss.fixed_channel = params->channel_fixed;
924
925 /* fix ourselves to that channel now already */
926 if (params->channel_fixed) {
927 sdata->local->oper_channel = params->channel;
928 WARN_ON(!ieee80211_set_channel_type(sdata->local, sdata,
929 NL80211_CHAN_NO_HT));
930 }
931
932 if (params->ie) {
933 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
934 GFP_KERNEL);
935 if (sdata->u.ibss.ie)
936 sdata->u.ibss.ie_len = params->ie_len;
937 }
938
939 sdata->u.ibss.skb = skb;
940 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
941 sdata->u.ibss.ibss_join_req = jiffies;
942
943 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
944 sdata->u.ibss.ssid_len = params->ssid_len;
945
946 mutex_unlock(&sdata->u.ibss.mtx);
947
948 mutex_lock(&sdata->local->mtx);
949 ieee80211_recalc_idle(sdata->local);
950 mutex_unlock(&sdata->local->mtx);
951
952 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
953
954 return 0;
955 }
956
957 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
958 {
959 struct sk_buff *skb;
960 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
961 struct ieee80211_local *local = sdata->local;
962 struct cfg80211_bss *cbss;
963 u16 capability;
964 int active_ibss;
965
966 mutex_lock(&sdata->u.ibss.mtx);
967
968 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
969 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
970 sdata->u.ibss.ssid_len = 0;
971
972 active_ibss = ieee80211_sta_active_ibss(sdata);
973
974 if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
975 capability = WLAN_CAPABILITY_IBSS;
976
977 if (ifibss->privacy)
978 capability |= WLAN_CAPABILITY_PRIVACY;
979
980 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
981 ifibss->bssid, ifibss->ssid,
982 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
983 WLAN_CAPABILITY_PRIVACY,
984 capability);
985
986 if (cbss) {
987 cfg80211_unlink_bss(local->hw.wiphy, cbss);
988 cfg80211_put_bss(cbss);
989 }
990 }
991
992 sta_info_flush(sdata->local, sdata);
993
994 /* remove beacon */
995 kfree(sdata->u.ibss.ie);
996 skb = rcu_dereference_protected(sdata->u.ibss.presp,
997 lockdep_is_held(&sdata->u.ibss.mtx));
998 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
999 sdata->vif.bss_conf.ibss_joined = false;
1000 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1001 BSS_CHANGED_IBSS);
1002 synchronize_rcu();
1003 kfree_skb(skb);
1004
1005 skb_queue_purge(&sdata->skb_queue);
1006
1007 del_timer_sync(&sdata->u.ibss.timer);
1008
1009 mutex_unlock(&sdata->u.ibss.mtx);
1010
1011 mutex_lock(&local->mtx);
1012 ieee80211_recalc_idle(sdata->local);
1013 mutex_unlock(&local->mtx);
1014
1015 return 0;
1016 }
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