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ARM: tegra: Don't WARN_ON() for too early dma channel allocations
[linux-2.6/btrfs-unstable.git] / net / mac80211 / ibss.c
bloba4643969a13b22524a7f90f0304c18d917f025be
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 enum nl80211_channel_type channel_type;
81
82 lockdep_assert_held(&ifibss->mtx);
83
84 /* Reset own TSF to allow time synchronization work. */
85 drv_reset_tsf(local, sdata);
86
87 skb = ifibss->skb;
88 RCU_INIT_POINTER(ifibss->presp, NULL);
89 synchronize_rcu();
90 skb->data = skb->head;
91 skb->len = 0;
92 skb_reset_tail_pointer(skb);
93 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
94
95 if (memcmp(ifibss->bssid, bssid, ETH_ALEN))
96 sta_info_flush(sdata->local, sdata);
97
98 /* if merging, indicate to driver that we leave the old IBSS */
99 if (sdata->vif.bss_conf.ibss_joined) {
100 sdata->vif.bss_conf.ibss_joined = false;
101 netif_carrier_off(sdata->dev);
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 channel_type = ifibss->channel_type;
111 if (channel_type > NL80211_CHAN_HT20 &&
112 !cfg80211_can_beacon_sec_chan(local->hw.wiphy, chan, channel_type))
113 channel_type = NL80211_CHAN_HT20;
114 if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
115 /* can only fail due to HT40+/- mismatch */
116 channel_type = NL80211_CHAN_HT20;
117 WARN_ON(!ieee80211_set_channel_type(local, sdata,
118 NL80211_CHAN_HT20));
119 }
120 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
121
122 sband = local->hw.wiphy->bands[chan->band];
123
124 /* build supported rates array */
125 pos = supp_rates;
126 for (i = 0; i < sband->n_bitrates; i++) {
127 int rate = sband->bitrates[i].bitrate;
128 u8 basic = 0;
129 if (basic_rates & BIT(i))
130 basic = 0x80;
131 *pos++ = basic | (u8) (rate / 5);
132 }
133
134 /* Build IBSS probe response */
135 mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
136 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
137 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
138 IEEE80211_STYPE_PROBE_RESP);
139 memset(mgmt->da, 0xff, ETH_ALEN);
140 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
141 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
142 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
143 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
144 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
145
146 pos = skb_put(skb, 2 + ifibss->ssid_len);
147 *pos++ = WLAN_EID_SSID;
148 *pos++ = ifibss->ssid_len;
149 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
150
151 rates = sband->n_bitrates;
152 if (rates > 8)
153 rates = 8;
154 pos = skb_put(skb, 2 + rates);
155 *pos++ = WLAN_EID_SUPP_RATES;
156 *pos++ = rates;
157 memcpy(pos, supp_rates, rates);
158
159 if (sband->band == IEEE80211_BAND_2GHZ) {
160 pos = skb_put(skb, 2 + 1);
161 *pos++ = WLAN_EID_DS_PARAMS;
162 *pos++ = 1;
163 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
164 }
165
166 pos = skb_put(skb, 2 + 2);
167 *pos++ = WLAN_EID_IBSS_PARAMS;
168 *pos++ = 2;
169 /* FIX: set ATIM window based on scan results */
170 *pos++ = 0;
171 *pos++ = 0;
172
173 if (sband->n_bitrates > 8) {
174 rates = sband->n_bitrates - 8;
175 pos = skb_put(skb, 2 + rates);
176 *pos++ = WLAN_EID_EXT_SUPP_RATES;
177 *pos++ = rates;
178 memcpy(pos, &supp_rates[8], rates);
179 }
180
181 if (ifibss->ie_len)
182 memcpy(skb_put(skb, ifibss->ie_len),
183 ifibss->ie, ifibss->ie_len);
184
185 /* add HT capability and information IEs */
186 if (channel_type && sband->ht_cap.ht_supported) {
187 pos = skb_put(skb, 4 +
188 sizeof(struct ieee80211_ht_cap) +
189 sizeof(struct ieee80211_ht_info));
190 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
191 sband->ht_cap.cap);
192 pos = ieee80211_ie_build_ht_info(pos,
193 &sband->ht_cap,
194 chan,
195 channel_type);
196 }
197
198 if (local->hw.queues >= 4) {
199 pos = skb_put(skb, 9);
200 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
201 *pos++ = 7; /* len */
202 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
203 *pos++ = 0x50;
204 *pos++ = 0xf2;
205 *pos++ = 2; /* WME */
206 *pos++ = 0; /* WME info */
207 *pos++ = 1; /* WME ver */
208 *pos++ = 0; /* U-APSD no in use */
209 }
210
211 rcu_assign_pointer(ifibss->presp, skb);
212
213 sdata->vif.bss_conf.beacon_int = beacon_int;
214 sdata->vif.bss_conf.basic_rates = basic_rates;
215 bss_change = BSS_CHANGED_BEACON_INT;
216 bss_change |= ieee80211_reset_erp_info(sdata);
217 bss_change |= BSS_CHANGED_BSSID;
218 bss_change |= BSS_CHANGED_BEACON;
219 bss_change |= BSS_CHANGED_BEACON_ENABLED;
220 bss_change |= BSS_CHANGED_BASIC_RATES;
221 bss_change |= BSS_CHANGED_HT;
222 bss_change |= BSS_CHANGED_IBSS;
223 sdata->vif.bss_conf.ibss_joined = true;
224 ieee80211_bss_info_change_notify(sdata, bss_change);
225
226 ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
227
228 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
229 mod_timer(&ifibss->timer,
230 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
231
232 bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
233 mgmt, skb->len, 0, GFP_KERNEL);
234 cfg80211_put_bss(bss);
235 netif_carrier_on(sdata->dev);
236 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
237 }
238
239 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
240 struct ieee80211_bss *bss)
241 {
242 struct cfg80211_bss *cbss =
243 container_of((void *)bss, struct cfg80211_bss, priv);
244 struct ieee80211_supported_band *sband;
245 u32 basic_rates;
246 int i, j;
247 u16 beacon_int = cbss->beacon_interval;
248
249 lockdep_assert_held(&sdata->u.ibss.mtx);
250
251 if (beacon_int < 10)
252 beacon_int = 10;
253
254 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
255
256 basic_rates = 0;
257
258 for (i = 0; i < bss->supp_rates_len; i++) {
259 int rate = (bss->supp_rates[i] & 0x7f) * 5;
260 bool is_basic = !!(bss->supp_rates[i] & 0x80);
261
262 for (j = 0; j < sband->n_bitrates; j++) {
263 if (sband->bitrates[j].bitrate == rate) {
264 if (is_basic)
265 basic_rates |= BIT(j);
266 break;
267 }
268 }
269 }
270
271 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
272 beacon_int,
273 cbss->channel,
274 basic_rates,
275 cbss->capability,
276 cbss->tsf);
277 }
278
279 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
280 __acquires(RCU)
281 {
282 struct ieee80211_sub_if_data *sdata = sta->sdata;
283 u8 addr[ETH_ALEN];
284
285 memcpy(addr, sta->sta.addr, ETH_ALEN);
286
287 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
288 wiphy_debug(sdata->local->hw.wiphy,
289 "Adding new IBSS station %pM (dev=%s)\n",
290 addr, sdata->name);
291 #endif
292
293 sta_info_move_state(sta, IEEE80211_STA_AUTH);
294 sta_info_move_state(sta, IEEE80211_STA_ASSOC);
295 sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
296
297 rate_control_rate_init(sta);
298
299 /* If it fails, maybe we raced another insertion? */
300 if (sta_info_insert_rcu(sta))
301 return sta_info_get(sdata, addr);
302 return sta;
303 }
304
305 static struct sta_info *
306 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
307 const u8 *bssid, const u8 *addr,
308 u32 supp_rates)
309 __acquires(RCU)
310 {
311 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
312 struct ieee80211_local *local = sdata->local;
313 struct sta_info *sta;
314 int band = local->hw.conf.channel->band;
315
316 /*
317 * XXX: Consider removing the least recently used entry and
318 * allow new one to be added.
319 */
320 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
321 if (net_ratelimit())
322 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
323 sdata->name, addr);
324 rcu_read_lock();
325 return NULL;
326 }
327
328 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
329 rcu_read_lock();
330 return NULL;
331 }
332
333 if (compare_ether_addr(bssid, sdata->u.ibss.bssid)) {
334 rcu_read_lock();
335 return NULL;
336 }
337
338 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
339 if (!sta) {
340 rcu_read_lock();
341 return NULL;
342 }
343
344 sta->last_rx = jiffies;
345
346 /* make sure mandatory rates are always added */
347 sta->sta.supp_rates[band] = supp_rates |
348 ieee80211_mandatory_rates(local, band);
349
350 return ieee80211_ibss_finish_sta(sta);
351 }
352
353 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
354 struct ieee80211_mgmt *mgmt,
355 size_t len,
356 struct ieee80211_rx_status *rx_status,
357 struct ieee802_11_elems *elems,
358 bool beacon)
359 {
360 struct ieee80211_local *local = sdata->local;
361 int freq;
362 struct cfg80211_bss *cbss;
363 struct ieee80211_bss *bss;
364 struct sta_info *sta;
365 struct ieee80211_channel *channel;
366 u64 beacon_timestamp, rx_timestamp;
367 u32 supp_rates = 0;
368 enum ieee80211_band band = rx_status->band;
369 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
370 bool rates_updated = false;
371
372 if (elems->ds_params && elems->ds_params_len == 1)
373 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
374 band);
375 else
376 freq = rx_status->freq;
377
378 channel = ieee80211_get_channel(local->hw.wiphy, freq);
379
380 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
381 return;
382
383 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
384 memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) {
385
386 rcu_read_lock();
387 sta = sta_info_get(sdata, mgmt->sa);
388
389 if (elems->supp_rates) {
390 supp_rates = ieee80211_sta_get_rates(local, elems,
391 band);
392 if (sta) {
393 u32 prev_rates;
394
395 prev_rates = sta->sta.supp_rates[band];
396 /* make sure mandatory rates are always added */
397 sta->sta.supp_rates[band] = supp_rates |
398 ieee80211_mandatory_rates(local, band);
399
400 if (sta->sta.supp_rates[band] != prev_rates) {
401 #ifdef CONFIG_MAC80211_IBSS_DEBUG
402 printk(KERN_DEBUG
403 "%s: updated supp_rates set "
404 "for %pM based on beacon"
405 "/probe_resp (0x%x -> 0x%x)\n",
406 sdata->name, sta->sta.addr,
407 prev_rates,
408 sta->sta.supp_rates[band]);
409 #endif
410 rates_updated = true;
411 }
412 } else {
413 rcu_read_unlock();
414 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
415 mgmt->sa, supp_rates);
416 }
417 }
418
419 if (sta && elems->wmm_info)
420 set_sta_flag(sta, WLAN_STA_WME);
421
422 if (sta && elems->ht_info_elem && elems->ht_cap_elem &&
423 sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) {
424 /* we both use HT */
425 struct ieee80211_sta_ht_cap sta_ht_cap_new;
426 enum nl80211_channel_type channel_type =
427 ieee80211_ht_info_to_channel_type(
428 elems->ht_info_elem);
429
430 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
431 elems->ht_cap_elem,
432 &sta_ht_cap_new);
433
434 /*
435 * fall back to HT20 if we don't use or use
436 * the other extension channel
437 */
438 if ((channel_type == NL80211_CHAN_HT40MINUS ||
439 channel_type == NL80211_CHAN_HT40PLUS) &&
440 channel_type != sdata->u.ibss.channel_type)
441 sta_ht_cap_new.cap &=
442 ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
443
444 if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new,
445 sizeof(sta_ht_cap_new))) {
446 memcpy(&sta->sta.ht_cap, &sta_ht_cap_new,
447 sizeof(sta_ht_cap_new));
448 rates_updated = true;
449 }
450 }
451
452 if (sta && rates_updated)
453 rate_control_rate_init(sta);
454
455 rcu_read_unlock();
456 }
457
458 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
459 channel, beacon);
460 if (!bss)
461 return;
462
463 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
464
465 /* was just updated in ieee80211_bss_info_update */
466 beacon_timestamp = cbss->tsf;
467
468 /* check if we need to merge IBSS */
469
470 /* we use a fixed BSSID */
471 if (sdata->u.ibss.fixed_bssid)
472 goto put_bss;
473
474 /* not an IBSS */
475 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
476 goto put_bss;
477
478 /* different channel */
479 if (cbss->channel != local->oper_channel)
480 goto put_bss;
481
482 /* different SSID */
483 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
484 memcmp(elems->ssid, sdata->u.ibss.ssid,
485 sdata->u.ibss.ssid_len))
486 goto put_bss;
487
488 /* same BSSID */
489 if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0)
490 goto put_bss;
491
492 if (rx_status->flag & RX_FLAG_MACTIME_MPDU) {
493 /*
494 * For correct IBSS merging we need mactime; since mactime is
495 * defined as the time the first data symbol of the frame hits
496 * the PHY, and the timestamp of the beacon is defined as "the
497 * time that the data symbol containing the first bit of the
498 * timestamp is transmitted to the PHY plus the transmitting
499 * STA's delays through its local PHY from the MAC-PHY
500 * interface to its interface with the WM" (802.11 11.1.2)
501 * - equals the time this bit arrives at the receiver - we have
502 * to take into account the offset between the two.
503 *
504 * E.g. at 1 MBit that means mactime is 192 usec earlier
505 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
506 */
507 int rate;
508
509 if (rx_status->flag & RX_FLAG_HT)
510 rate = 65; /* TODO: HT rates */
511 else
512 rate = local->hw.wiphy->bands[band]->
513 bitrates[rx_status->rate_idx].bitrate;
514
515 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
516 } else {
517 /*
518 * second best option: get current TSF
519 * (will return -1 if not supported)
520 */
521 rx_timestamp = drv_get_tsf(local, sdata);
522 }
523
524 #ifdef CONFIG_MAC80211_IBSS_DEBUG
525 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
526 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
527 mgmt->sa, mgmt->bssid,
528 (unsigned long long)rx_timestamp,
529 (unsigned long long)beacon_timestamp,
530 (unsigned long long)(rx_timestamp - beacon_timestamp),
531 jiffies);
532 #endif
533
534 if (beacon_timestamp > rx_timestamp) {
535 #ifdef CONFIG_MAC80211_IBSS_DEBUG
536 printk(KERN_DEBUG "%s: beacon TSF higher than "
537 "local TSF - IBSS merge with BSSID %pM\n",
538 sdata->name, mgmt->bssid);
539 #endif
540 ieee80211_sta_join_ibss(sdata, bss);
541 supp_rates = ieee80211_sta_get_rates(local, elems, band);
542 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
543 supp_rates);
544 rcu_read_unlock();
545 }
546
547 put_bss:
548 ieee80211_rx_bss_put(local, bss);
549 }
550
551 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
552 const u8 *bssid, const u8 *addr,
553 u32 supp_rates)
554 {
555 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
556 struct ieee80211_local *local = sdata->local;
557 struct sta_info *sta;
558 int band = local->hw.conf.channel->band;
559
560 /*
561 * XXX: Consider removing the least recently used entry and
562 * allow new one to be added.
563 */
564 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
565 if (net_ratelimit())
566 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
567 sdata->name, addr);
568 return;
569 }
570
571 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
572 return;
573
574 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
575 return;
576
577 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
578 if (!sta)
579 return;
580
581 sta->last_rx = jiffies;
582
583 /* make sure mandatory rates are always added */
584 sta->sta.supp_rates[band] = supp_rates |
585 ieee80211_mandatory_rates(local, band);
586
587 spin_lock(&ifibss->incomplete_lock);
588 list_add(&sta->list, &ifibss->incomplete_stations);
589 spin_unlock(&ifibss->incomplete_lock);
590 ieee80211_queue_work(&local->hw, &sdata->work);
591 }
592
593 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
594 {
595 struct ieee80211_local *local = sdata->local;
596 int active = 0;
597 struct sta_info *sta;
598
599 lockdep_assert_held(&sdata->u.ibss.mtx);
600
601 rcu_read_lock();
602
603 list_for_each_entry_rcu(sta, &local->sta_list, list) {
604 if (sta->sdata == sdata &&
605 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
606 jiffies)) {
607 active++;
608 break;
609 }
610 }
611
612 rcu_read_unlock();
613
614 return active;
615 }
616
617 /*
618 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
619 */
620
621 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
622 {
623 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
624
625 lockdep_assert_held(&ifibss->mtx);
626
627 mod_timer(&ifibss->timer,
628 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
629
630 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
631
632 if (time_before(jiffies, ifibss->last_scan_completed +
633 IEEE80211_IBSS_MERGE_INTERVAL))
634 return;
635
636 if (ieee80211_sta_active_ibss(sdata))
637 return;
638
639 if (ifibss->fixed_channel)
640 return;
641
642 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
643 "IBSS networks with same SSID (merge)\n", sdata->name);
644
645 ieee80211_request_internal_scan(sdata,
646 ifibss->ssid, ifibss->ssid_len,
647 ifibss->fixed_channel ? ifibss->channel : NULL);
648 }
649
650 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
651 {
652 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
653 u8 bssid[ETH_ALEN];
654 u16 capability;
655 int i;
656
657 lockdep_assert_held(&ifibss->mtx);
658
659 if (ifibss->fixed_bssid) {
660 memcpy(bssid, ifibss->bssid, ETH_ALEN);
661 } else {
662 /* Generate random, not broadcast, locally administered BSSID. Mix in
663 * own MAC address to make sure that devices that do not have proper
664 * random number generator get different BSSID. */
665 get_random_bytes(bssid, ETH_ALEN);
666 for (i = 0; i < ETH_ALEN; i++)
667 bssid[i] ^= sdata->vif.addr[i];
668 bssid[0] &= ~0x01;
669 bssid[0] |= 0x02;
670 }
671
672 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
673 sdata->name, bssid);
674
675 capability = WLAN_CAPABILITY_IBSS;
676
677 if (ifibss->privacy)
678 capability |= WLAN_CAPABILITY_PRIVACY;
679 else
680 sdata->drop_unencrypted = 0;
681
682 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
683 ifibss->channel, ifibss->basic_rates,
684 capability, 0);
685 }
686
687 /*
688 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
689 */
690
691 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
692 {
693 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
694 struct ieee80211_local *local = sdata->local;
695 struct cfg80211_bss *cbss;
696 struct ieee80211_channel *chan = NULL;
697 const u8 *bssid = NULL;
698 int active_ibss;
699 u16 capability;
700
701 lockdep_assert_held(&ifibss->mtx);
702
703 active_ibss = ieee80211_sta_active_ibss(sdata);
704 #ifdef CONFIG_MAC80211_IBSS_DEBUG
705 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
706 sdata->name, active_ibss);
707 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
708
709 if (active_ibss)
710 return;
711
712 capability = WLAN_CAPABILITY_IBSS;
713 if (ifibss->privacy)
714 capability |= WLAN_CAPABILITY_PRIVACY;
715 if (ifibss->fixed_bssid)
716 bssid = ifibss->bssid;
717 if (ifibss->fixed_channel)
718 chan = ifibss->channel;
719 if (!is_zero_ether_addr(ifibss->bssid))
720 bssid = ifibss->bssid;
721 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
722 ifibss->ssid, ifibss->ssid_len,
723 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
724 capability);
725
726 if (cbss) {
727 struct ieee80211_bss *bss;
728
729 bss = (void *)cbss->priv;
730 #ifdef CONFIG_MAC80211_IBSS_DEBUG
731 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
732 "%pM\n", cbss->bssid, ifibss->bssid);
733 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
734
735 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
736 " based on configured SSID\n",
737 sdata->name, cbss->bssid);
738
739 ieee80211_sta_join_ibss(sdata, bss);
740 ieee80211_rx_bss_put(local, bss);
741 return;
742 }
743
744 #ifdef CONFIG_MAC80211_IBSS_DEBUG
745 printk(KERN_DEBUG " did not try to join ibss\n");
746 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
747
748 /* Selected IBSS not found in current scan results - try to scan */
749 if (time_after(jiffies, ifibss->last_scan_completed +
750 IEEE80211_SCAN_INTERVAL)) {
751 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
752 "join\n", sdata->name);
753
754 ieee80211_request_internal_scan(sdata,
755 ifibss->ssid, ifibss->ssid_len,
756 ifibss->fixed_channel ? ifibss->channel : NULL);
757 } else {
758 int interval = IEEE80211_SCAN_INTERVAL;
759
760 if (time_after(jiffies, ifibss->ibss_join_req +
761 IEEE80211_IBSS_JOIN_TIMEOUT)) {
762 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
763 ieee80211_sta_create_ibss(sdata);
764 return;
765 }
766 printk(KERN_DEBUG "%s: IBSS not allowed on"
767 " %d MHz\n", sdata->name,
768 local->hw.conf.channel->center_freq);
769
770 /* No IBSS found - decrease scan interval and continue
771 * scanning. */
772 interval = IEEE80211_SCAN_INTERVAL_SLOW;
773 }
774
775 mod_timer(&ifibss->timer,
776 round_jiffies(jiffies + interval));
777 }
778 }
779
780 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
781 struct sk_buff *req)
782 {
783 struct ieee80211_mgmt *mgmt = (void *)req->data;
784 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
785 struct ieee80211_local *local = sdata->local;
786 int tx_last_beacon, len = req->len;
787 struct sk_buff *skb;
788 struct ieee80211_mgmt *resp;
789 struct sk_buff *presp;
790 u8 *pos, *end;
791
792 lockdep_assert_held(&ifibss->mtx);
793
794 presp = rcu_dereference_protected(ifibss->presp,
795 lockdep_is_held(&ifibss->mtx));
796
797 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
798 len < 24 + 2 || !presp)
799 return;
800
801 tx_last_beacon = drv_tx_last_beacon(local);
802
803 #ifdef CONFIG_MAC80211_IBSS_DEBUG
804 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
805 " (tx_last_beacon=%d)\n",
806 sdata->name, mgmt->sa, mgmt->da,
807 mgmt->bssid, tx_last_beacon);
808 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
809
810 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
811 return;
812
813 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
814 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
815 return;
816
817 end = ((u8 *) mgmt) + len;
818 pos = mgmt->u.probe_req.variable;
819 if (pos[0] != WLAN_EID_SSID ||
820 pos + 2 + pos[1] > end) {
821 #ifdef CONFIG_MAC80211_IBSS_DEBUG
822 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
823 "from %pM\n",
824 sdata->name, mgmt->sa);
825 #endif
826 return;
827 }
828 if (pos[1] != 0 &&
829 (pos[1] != ifibss->ssid_len ||
830 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
831 /* Ignore ProbeReq for foreign SSID */
832 return;
833 }
834
835 /* Reply with ProbeResp */
836 skb = skb_copy(presp, GFP_KERNEL);
837 if (!skb)
838 return;
839
840 resp = (struct ieee80211_mgmt *) skb->data;
841 memcpy(resp->da, mgmt->sa, ETH_ALEN);
842 #ifdef CONFIG_MAC80211_IBSS_DEBUG
843 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
844 sdata->name, resp->da);
845 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
846 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
847 ieee80211_tx_skb(sdata, skb);
848 }
849
850 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
851 struct ieee80211_mgmt *mgmt,
852 size_t len,
853 struct ieee80211_rx_status *rx_status)
854 {
855 size_t baselen;
856 struct ieee802_11_elems elems;
857
858 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
859 return; /* ignore ProbeResp to foreign address */
860
861 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
862 if (baselen > len)
863 return;
864
865 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
866 &elems);
867
868 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
869 }
870
871 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
872 struct ieee80211_mgmt *mgmt,
873 size_t len,
874 struct ieee80211_rx_status *rx_status)
875 {
876 size_t baselen;
877 struct ieee802_11_elems elems;
878
879 /* Process beacon from the current BSS */
880 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
881 if (baselen > len)
882 return;
883
884 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
885
886 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
887 }
888
889 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
890 struct sk_buff *skb)
891 {
892 struct ieee80211_rx_status *rx_status;
893 struct ieee80211_mgmt *mgmt;
894 u16 fc;
895
896 rx_status = IEEE80211_SKB_RXCB(skb);
897 mgmt = (struct ieee80211_mgmt *) skb->data;
898 fc = le16_to_cpu(mgmt->frame_control);
899
900 mutex_lock(&sdata->u.ibss.mtx);
901
902 if (!sdata->u.ibss.ssid_len)
903 goto mgmt_out; /* not ready to merge yet */
904
905 switch (fc & IEEE80211_FCTL_STYPE) {
906 case IEEE80211_STYPE_PROBE_REQ:
907 ieee80211_rx_mgmt_probe_req(sdata, skb);
908 break;
909 case IEEE80211_STYPE_PROBE_RESP:
910 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
911 rx_status);
912 break;
913 case IEEE80211_STYPE_BEACON:
914 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
915 rx_status);
916 break;
917 case IEEE80211_STYPE_AUTH:
918 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
919 break;
920 }
921
922 mgmt_out:
923 mutex_unlock(&sdata->u.ibss.mtx);
924 }
925
926 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
927 {
928 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
929 struct sta_info *sta;
930
931 mutex_lock(&ifibss->mtx);
932
933 /*
934 * Work could be scheduled after scan or similar
935 * when we aren't even joined (or trying) with a
936 * network.
937 */
938 if (!ifibss->ssid_len)
939 goto out;
940
941 spin_lock_bh(&ifibss->incomplete_lock);
942 while (!list_empty(&ifibss->incomplete_stations)) {
943 sta = list_first_entry(&ifibss->incomplete_stations,
944 struct sta_info, list);
945 list_del(&sta->list);
946 spin_unlock_bh(&ifibss->incomplete_lock);
947
948 ieee80211_ibss_finish_sta(sta);
949 rcu_read_unlock();
950 spin_lock_bh(&ifibss->incomplete_lock);
951 }
952 spin_unlock_bh(&ifibss->incomplete_lock);
953
954 switch (ifibss->state) {
955 case IEEE80211_IBSS_MLME_SEARCH:
956 ieee80211_sta_find_ibss(sdata);
957 break;
958 case IEEE80211_IBSS_MLME_JOINED:
959 ieee80211_sta_merge_ibss(sdata);
960 break;
961 default:
962 WARN_ON(1);
963 break;
964 }
965
966 out:
967 mutex_unlock(&ifibss->mtx);
968 }
969
970 static void ieee80211_ibss_timer(unsigned long data)
971 {
972 struct ieee80211_sub_if_data *sdata =
973 (struct ieee80211_sub_if_data *) data;
974 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
975 struct ieee80211_local *local = sdata->local;
976
977 if (local->quiescing) {
978 ifibss->timer_running = true;
979 return;
980 }
981
982 ieee80211_queue_work(&local->hw, &sdata->work);
983 }
984
985 #ifdef CONFIG_PM
986 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
987 {
988 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
989
990 if (del_timer_sync(&ifibss->timer))
991 ifibss->timer_running = true;
992 }
993
994 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
995 {
996 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
997
998 if (ifibss->timer_running) {
999 add_timer(&ifibss->timer);
1000 ifibss->timer_running = false;
1001 }
1002 }
1003 #endif
1004
1005 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1006 {
1007 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1008
1009 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1010 (unsigned long) sdata);
1011 mutex_init(&ifibss->mtx);
1012 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1013 spin_lock_init(&ifibss->incomplete_lock);
1014 }
1015
1016 /* scan finished notification */
1017 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1018 {
1019 struct ieee80211_sub_if_data *sdata;
1020
1021 mutex_lock(&local->iflist_mtx);
1022 list_for_each_entry(sdata, &local->interfaces, list) {
1023 if (!ieee80211_sdata_running(sdata))
1024 continue;
1025 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1026 continue;
1027 sdata->u.ibss.last_scan_completed = jiffies;
1028 ieee80211_queue_work(&local->hw, &sdata->work);
1029 }
1030 mutex_unlock(&local->iflist_mtx);
1031 }
1032
1033 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1034 struct cfg80211_ibss_params *params)
1035 {
1036 struct sk_buff *skb;
1037 u32 changed = 0;
1038
1039 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
1040 sizeof(struct ieee80211_hdr_3addr) +
1041 12 /* struct ieee80211_mgmt.u.beacon */ +
1042 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
1043 2 + 8 /* max Supported Rates */ +
1044 3 /* max DS params */ +
1045 4 /* IBSS params */ +
1046 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
1047 2 + sizeof(struct ieee80211_ht_cap) +
1048 2 + sizeof(struct ieee80211_ht_info) +
1049 params->ie_len);
1050 if (!skb)
1051 return -ENOMEM;
1052
1053 mutex_lock(&sdata->u.ibss.mtx);
1054
1055 if (params->bssid) {
1056 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1057 sdata->u.ibss.fixed_bssid = true;
1058 } else
1059 sdata->u.ibss.fixed_bssid = false;
1060
1061 sdata->u.ibss.privacy = params->privacy;
1062 sdata->u.ibss.basic_rates = params->basic_rates;
1063 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1064 sizeof(params->mcast_rate));
1065
1066 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1067
1068 sdata->u.ibss.channel = params->channel;
1069 sdata->u.ibss.channel_type = params->channel_type;
1070 sdata->u.ibss.fixed_channel = params->channel_fixed;
1071
1072 /* fix ourselves to that channel now already */
1073 if (params->channel_fixed) {
1074 sdata->local->oper_channel = params->channel;
1075 if (!ieee80211_set_channel_type(sdata->local, sdata,
1076 params->channel_type)) {
1077 mutex_unlock(&sdata->u.ibss.mtx);
1078 kfree_skb(skb);
1079 return -EINVAL;
1080 }
1081 }
1082
1083 if (params->ie) {
1084 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1085 GFP_KERNEL);
1086 if (sdata->u.ibss.ie)
1087 sdata->u.ibss.ie_len = params->ie_len;
1088 }
1089
1090 sdata->u.ibss.skb = skb;
1091 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1092 sdata->u.ibss.ibss_join_req = jiffies;
1093
1094 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
1095 sdata->u.ibss.ssid_len = params->ssid_len;
1096
1097 mutex_unlock(&sdata->u.ibss.mtx);
1098
1099 mutex_lock(&sdata->local->mtx);
1100 ieee80211_recalc_idle(sdata->local);
1101 mutex_unlock(&sdata->local->mtx);
1102
1103 /*
1104 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1105 * reserved, but an HT STA shall protect HT transmissions as though
1106 * the HT Protection field were set to non-HT mixed mode.
1107 *
1108 * In an IBSS, the RIFS Mode field of the HT Operation element is
1109 * also reserved, but an HT STA shall operate as though this field
1110 * were set to 1.
1111 */
1112
1113 sdata->vif.bss_conf.ht_operation_mode |=
1114 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1115 | IEEE80211_HT_PARAM_RIFS_MODE;
1116
1117 changed |= BSS_CHANGED_HT;
1118 ieee80211_bss_info_change_notify(sdata, changed);
1119
1120 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1121
1122 return 0;
1123 }
1124
1125 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1126 {
1127 struct sk_buff *skb;
1128 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1129 struct ieee80211_local *local = sdata->local;
1130 struct cfg80211_bss *cbss;
1131 u16 capability;
1132 int active_ibss;
1133 struct sta_info *sta;
1134
1135 mutex_lock(&sdata->u.ibss.mtx);
1136
1137 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1138 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
1139 sdata->u.ibss.ssid_len = 0;
1140
1141 active_ibss = ieee80211_sta_active_ibss(sdata);
1142
1143 if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
1144 capability = WLAN_CAPABILITY_IBSS;
1145
1146 if (ifibss->privacy)
1147 capability |= WLAN_CAPABILITY_PRIVACY;
1148
1149 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
1150 ifibss->bssid, ifibss->ssid,
1151 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
1152 WLAN_CAPABILITY_PRIVACY,
1153 capability);
1154
1155 if (cbss) {
1156 cfg80211_unlink_bss(local->hw.wiphy, cbss);
1157 cfg80211_put_bss(cbss);
1158 }
1159 }
1160
1161 sta_info_flush(sdata->local, sdata);
1162
1163 spin_lock_bh(&ifibss->incomplete_lock);
1164 while (!list_empty(&ifibss->incomplete_stations)) {
1165 sta = list_first_entry(&ifibss->incomplete_stations,
1166 struct sta_info, list);
1167 list_del(&sta->list);
1168 spin_unlock_bh(&ifibss->incomplete_lock);
1169
1170 sta_info_free(local, sta);
1171 spin_lock_bh(&ifibss->incomplete_lock);
1172 }
1173 spin_unlock_bh(&ifibss->incomplete_lock);
1174
1175 netif_carrier_off(sdata->dev);
1176
1177 /* remove beacon */
1178 kfree(sdata->u.ibss.ie);
1179 skb = rcu_dereference_protected(sdata->u.ibss.presp,
1180 lockdep_is_held(&sdata->u.ibss.mtx));
1181 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
1182 sdata->vif.bss_conf.ibss_joined = false;
1183 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1184 BSS_CHANGED_IBSS);
1185 synchronize_rcu();
1186 kfree_skb(skb);
1187
1188 skb_queue_purge(&sdata->skb_queue);
1189
1190 del_timer_sync(&sdata->u.ibss.timer);
1191
1192 mutex_unlock(&sdata->u.ibss.mtx);
1193
1194 mutex_lock(&local->mtx);
1195 ieee80211_recalc_idle(sdata->local);
1196 mutex_unlock(&local->mtx);
1197
1198 return 0;
1199 }
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