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NOMMU: Fix __get_user_pages() to pin last page on offset buffers
[nv-tegra-linux-2.6.git] / net / mac80211 / ibss.c
blobf3e94248674948afc3c1b29be81c9b1ce1f234f3
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/if_ether.h>
17 #include <linux/skbuff.h>
18 #include <linux/if_arp.h>
19 #include <linux/etherdevice.h>
20 #include <linux/rtnetlink.h>
21 #include <net/mac80211.h>
22 #include <asm/unaligned.h>
23
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
26 #include "rate.h"
27
28 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
29 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
30 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
31
32 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
33 #define IEEE80211_IBSS_MERGE_DELAY 0x400000
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, status_code;
44
45 if (len < 24 + 6)
46 return;
47
48 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
49 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
50 status_code = le16_to_cpu(mgmt->u.auth.status_code);
51
52 /*
53 * IEEE 802.11 standard does not require authentication in IBSS
54 * networks and most implementations do not seem to use it.
55 * However, try to reply to authentication attempts if someone
56 * has actually implemented this.
57 */
58 if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1)
59 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
60 sdata->u.ibss.bssid, NULL, 0, 0);
61 }
62
63 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
64 const u8 *bssid, const int beacon_int,
65 struct ieee80211_channel *chan,
66 const u32 basic_rates,
67 const u16 capability, u64 tsf)
68 {
69 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
70 struct ieee80211_local *local = sdata->local;
71 int rates, i;
72 struct sk_buff *skb;
73 struct ieee80211_mgmt *mgmt;
74 u8 *pos;
75 struct ieee80211_supported_band *sband;
76 struct cfg80211_bss *bss;
77 u32 bss_change;
78 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
79
80 /* Reset own TSF to allow time synchronization work. */
81 drv_reset_tsf(local);
82
83 skb = ifibss->skb;
84 rcu_assign_pointer(ifibss->presp, NULL);
85 synchronize_rcu();
86 skb->data = skb->head;
87 skb->len = 0;
88 skb_reset_tail_pointer(skb);
89 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
90
91 if (memcmp(ifibss->bssid, bssid, ETH_ALEN))
92 sta_info_flush(sdata->local, sdata);
93
94 memcpy(ifibss->bssid, bssid, ETH_ALEN);
95
96 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
97
98 local->oper_channel = chan;
99 local->oper_channel_type = NL80211_CHAN_NO_HT;
100 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
101
102 sband = local->hw.wiphy->bands[chan->band];
103
104 /* build supported rates array */
105 pos = supp_rates;
106 for (i = 0; i < sband->n_bitrates; i++) {
107 int rate = sband->bitrates[i].bitrate;
108 u8 basic = 0;
109 if (basic_rates & BIT(i))
110 basic = 0x80;
111 *pos++ = basic | (u8) (rate / 5);
112 }
113
114 /* Build IBSS probe response */
115 mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
116 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
117 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
118 IEEE80211_STYPE_PROBE_RESP);
119 memset(mgmt->da, 0xff, ETH_ALEN);
120 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
121 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
122 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
123 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
124 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
125
126 pos = skb_put(skb, 2 + ifibss->ssid_len);
127 *pos++ = WLAN_EID_SSID;
128 *pos++ = ifibss->ssid_len;
129 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
130
131 rates = sband->n_bitrates;
132 if (rates > 8)
133 rates = 8;
134 pos = skb_put(skb, 2 + rates);
135 *pos++ = WLAN_EID_SUPP_RATES;
136 *pos++ = rates;
137 memcpy(pos, supp_rates, rates);
138
139 if (sband->band == IEEE80211_BAND_2GHZ) {
140 pos = skb_put(skb, 2 + 1);
141 *pos++ = WLAN_EID_DS_PARAMS;
142 *pos++ = 1;
143 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
144 }
145
146 pos = skb_put(skb, 2 + 2);
147 *pos++ = WLAN_EID_IBSS_PARAMS;
148 *pos++ = 2;
149 /* FIX: set ATIM window based on scan results */
150 *pos++ = 0;
151 *pos++ = 0;
152
153 if (sband->n_bitrates > 8) {
154 rates = sband->n_bitrates - 8;
155 pos = skb_put(skb, 2 + rates);
156 *pos++ = WLAN_EID_EXT_SUPP_RATES;
157 *pos++ = rates;
158 memcpy(pos, &supp_rates[8], rates);
159 }
160
161 if (ifibss->ie_len)
162 memcpy(skb_put(skb, ifibss->ie_len),
163 ifibss->ie, ifibss->ie_len);
164
165 rcu_assign_pointer(ifibss->presp, skb);
166
167 sdata->vif.bss_conf.beacon_int = beacon_int;
168 bss_change = BSS_CHANGED_BEACON_INT;
169 bss_change |= ieee80211_reset_erp_info(sdata);
170 bss_change |= BSS_CHANGED_BSSID;
171 bss_change |= BSS_CHANGED_BEACON;
172 bss_change |= BSS_CHANGED_BEACON_ENABLED;
173 ieee80211_bss_info_change_notify(sdata, bss_change);
174
175 ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
176
177 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
178 mod_timer(&ifibss->timer,
179 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
180
181 bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
182 mgmt, skb->len, 0, GFP_KERNEL);
183 cfg80211_put_bss(bss);
184 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
185 }
186
187 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
188 struct ieee80211_bss *bss)
189 {
190 struct cfg80211_bss *cbss =
191 container_of((void *)bss, struct cfg80211_bss, priv);
192 struct ieee80211_supported_band *sband;
193 u32 basic_rates;
194 int i, j;
195 u16 beacon_int = cbss->beacon_interval;
196
197 if (beacon_int < 10)
198 beacon_int = 10;
199
200 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
201
202 basic_rates = 0;
203
204 for (i = 0; i < bss->supp_rates_len; i++) {
205 int rate = (bss->supp_rates[i] & 0x7f) * 5;
206 bool is_basic = !!(bss->supp_rates[i] & 0x80);
207
208 for (j = 0; j < sband->n_bitrates; j++) {
209 if (sband->bitrates[j].bitrate == rate) {
210 if (is_basic)
211 basic_rates |= BIT(j);
212 break;
213 }
214 }
215 }
216
217 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
218 beacon_int,
219 cbss->channel,
220 basic_rates,
221 cbss->capability,
222 cbss->tsf);
223 }
224
225 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
226 struct ieee80211_mgmt *mgmt,
227 size_t len,
228 struct ieee80211_rx_status *rx_status,
229 struct ieee802_11_elems *elems,
230 bool beacon)
231 {
232 struct ieee80211_local *local = sdata->local;
233 int freq;
234 struct cfg80211_bss *cbss;
235 struct ieee80211_bss *bss;
236 struct sta_info *sta;
237 struct ieee80211_channel *channel;
238 u64 beacon_timestamp, rx_timestamp;
239 u32 supp_rates = 0;
240 enum ieee80211_band band = rx_status->band;
241
242 if (elems->ds_params && elems->ds_params_len == 1)
243 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
244 else
245 freq = rx_status->freq;
246
247 channel = ieee80211_get_channel(local->hw.wiphy, freq);
248
249 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
250 return;
251
252 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
253 memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) {
254 supp_rates = ieee80211_sta_get_rates(local, elems, band);
255
256 rcu_read_lock();
257
258 sta = sta_info_get(sdata, mgmt->sa);
259 if (sta) {
260 u32 prev_rates;
261
262 prev_rates = sta->sta.supp_rates[band];
263 /* make sure mandatory rates are always added */
264 sta->sta.supp_rates[band] = supp_rates |
265 ieee80211_mandatory_rates(local, band);
266
267 #ifdef CONFIG_MAC80211_IBSS_DEBUG
268 if (sta->sta.supp_rates[band] != prev_rates)
269 printk(KERN_DEBUG "%s: updated supp_rates set "
270 "for %pM based on beacon info (0x%llx | "
271 "0x%llx -> 0x%llx)\n",
272 sdata->name,
273 sta->sta.addr,
274 (unsigned long long) prev_rates,
275 (unsigned long long) supp_rates,
276 (unsigned long long) sta->sta.supp_rates[band]);
277 #endif
278 rcu_read_unlock();
279 } else {
280 rcu_read_unlock();
281 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
282 supp_rates, GFP_KERNEL);
283 }
284 }
285
286 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
287 channel, beacon);
288 if (!bss)
289 return;
290
291 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
292
293 /* was just updated in ieee80211_bss_info_update */
294 beacon_timestamp = cbss->tsf;
295
296 /* check if we need to merge IBSS */
297
298 /* we use a fixed BSSID */
299 if (sdata->u.ibss.fixed_bssid)
300 goto put_bss;
301
302 /* not an IBSS */
303 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
304 goto put_bss;
305
306 /* different channel */
307 if (cbss->channel != local->oper_channel)
308 goto put_bss;
309
310 /* different SSID */
311 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
312 memcmp(elems->ssid, sdata->u.ibss.ssid,
313 sdata->u.ibss.ssid_len))
314 goto put_bss;
315
316 /* same BSSID */
317 if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0)
318 goto put_bss;
319
320 if (rx_status->flag & RX_FLAG_TSFT) {
321 /*
322 * For correct IBSS merging we need mactime; since mactime is
323 * defined as the time the first data symbol of the frame hits
324 * the PHY, and the timestamp of the beacon is defined as "the
325 * time that the data symbol containing the first bit of the
326 * timestamp is transmitted to the PHY plus the transmitting
327 * STA's delays through its local PHY from the MAC-PHY
328 * interface to its interface with the WM" (802.11 11.1.2)
329 * - equals the time this bit arrives at the receiver - we have
330 * to take into account the offset between the two.
331 *
332 * E.g. at 1 MBit that means mactime is 192 usec earlier
333 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
334 */
335 int rate;
336
337 if (rx_status->flag & RX_FLAG_HT)
338 rate = 65; /* TODO: HT rates */
339 else
340 rate = local->hw.wiphy->bands[band]->
341 bitrates[rx_status->rate_idx].bitrate;
342
343 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
344 } else {
345 /*
346 * second best option: get current TSF
347 * (will return -1 if not supported)
348 */
349 rx_timestamp = drv_get_tsf(local);
350 }
351
352 #ifdef CONFIG_MAC80211_IBSS_DEBUG
353 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
354 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
355 mgmt->sa, mgmt->bssid,
356 (unsigned long long)rx_timestamp,
357 (unsigned long long)beacon_timestamp,
358 (unsigned long long)(rx_timestamp - beacon_timestamp),
359 jiffies);
360 #endif
361
362 /* give slow hardware some time to do the TSF sync */
363 if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY)
364 goto put_bss;
365
366 if (beacon_timestamp > rx_timestamp) {
367 #ifdef CONFIG_MAC80211_IBSS_DEBUG
368 printk(KERN_DEBUG "%s: beacon TSF higher than "
369 "local TSF - IBSS merge with BSSID %pM\n",
370 sdata->name, mgmt->bssid);
371 #endif
372 ieee80211_sta_join_ibss(sdata, bss);
373 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
374 supp_rates, GFP_KERNEL);
375 }
376
377 put_bss:
378 ieee80211_rx_bss_put(local, bss);
379 }
380
381 /*
382 * Add a new IBSS station, will also be called by the RX code when,
383 * in IBSS mode, receiving a frame from a yet-unknown station, hence
384 * must be callable in atomic context.
385 */
386 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
387 u8 *bssid,u8 *addr, u32 supp_rates,
388 gfp_t gfp)
389 {
390 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
391 struct ieee80211_local *local = sdata->local;
392 struct sta_info *sta;
393 int band = local->hw.conf.channel->band;
394
395 /*
396 * XXX: Consider removing the least recently used entry and
397 * allow new one to be added.
398 */
399 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
400 if (net_ratelimit())
401 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
402 sdata->name, addr);
403 return NULL;
404 }
405
406 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
407 return NULL;
408
409 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
410 return NULL;
411
412 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
413 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
414 wiphy_name(local->hw.wiphy), addr, sdata->name);
415 #endif
416
417 sta = sta_info_alloc(sdata, addr, gfp);
418 if (!sta)
419 return NULL;
420
421 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
422
423 /* make sure mandatory rates are always added */
424 sta->sta.supp_rates[band] = supp_rates |
425 ieee80211_mandatory_rates(local, band);
426
427 rate_control_rate_init(sta);
428
429 /* If it fails, maybe we raced another insertion? */
430 if (sta_info_insert(sta))
431 return sta_info_get(sdata, addr);
432 return sta;
433 }
434
435 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
436 {
437 struct ieee80211_local *local = sdata->local;
438 int active = 0;
439 struct sta_info *sta;
440
441 rcu_read_lock();
442
443 list_for_each_entry_rcu(sta, &local->sta_list, list) {
444 if (sta->sdata == sdata &&
445 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
446 jiffies)) {
447 active++;
448 break;
449 }
450 }
451
452 rcu_read_unlock();
453
454 return active;
455 }
456
457 /*
458 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
459 */
460
461 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
462 {
463 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
464
465 mod_timer(&ifibss->timer,
466 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
467
468 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
469
470 if (time_before(jiffies, ifibss->last_scan_completed +
471 IEEE80211_IBSS_MERGE_INTERVAL))
472 return;
473
474 if (ieee80211_sta_active_ibss(sdata))
475 return;
476
477 if (ifibss->fixed_channel)
478 return;
479
480 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
481 "IBSS networks with same SSID (merge)\n", sdata->name);
482
483 ieee80211_request_internal_scan(sdata, ifibss->ssid, ifibss->ssid_len);
484 }
485
486 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
487 {
488 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
489 struct ieee80211_local *local = sdata->local;
490 struct ieee80211_supported_band *sband;
491 u8 bssid[ETH_ALEN];
492 u16 capability;
493 int i;
494
495 if (ifibss->fixed_bssid) {
496 memcpy(bssid, ifibss->bssid, ETH_ALEN);
497 } else {
498 /* Generate random, not broadcast, locally administered BSSID. Mix in
499 * own MAC address to make sure that devices that do not have proper
500 * random number generator get different BSSID. */
501 get_random_bytes(bssid, ETH_ALEN);
502 for (i = 0; i < ETH_ALEN; i++)
503 bssid[i] ^= sdata->vif.addr[i];
504 bssid[0] &= ~0x01;
505 bssid[0] |= 0x02;
506 }
507
508 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
509 sdata->name, bssid);
510
511 sband = local->hw.wiphy->bands[ifibss->channel->band];
512
513 capability = WLAN_CAPABILITY_IBSS;
514
515 if (ifibss->privacy)
516 capability |= WLAN_CAPABILITY_PRIVACY;
517 else
518 sdata->drop_unencrypted = 0;
519
520 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
521 ifibss->channel, 3, /* first two are basic */
522 capability, 0);
523 }
524
525 /*
526 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
527 */
528
529 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
530 {
531 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
532 struct ieee80211_local *local = sdata->local;
533 struct cfg80211_bss *cbss;
534 struct ieee80211_channel *chan = NULL;
535 const u8 *bssid = NULL;
536 int active_ibss;
537 u16 capability;
538
539 active_ibss = ieee80211_sta_active_ibss(sdata);
540 #ifdef CONFIG_MAC80211_IBSS_DEBUG
541 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
542 sdata->name, active_ibss);
543 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
544
545 if (active_ibss)
546 return;
547
548 capability = WLAN_CAPABILITY_IBSS;
549 if (ifibss->privacy)
550 capability |= WLAN_CAPABILITY_PRIVACY;
551 if (ifibss->fixed_bssid)
552 bssid = ifibss->bssid;
553 if (ifibss->fixed_channel)
554 chan = ifibss->channel;
555 if (!is_zero_ether_addr(ifibss->bssid))
556 bssid = ifibss->bssid;
557 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
558 ifibss->ssid, ifibss->ssid_len,
559 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
560 capability);
561
562 if (cbss) {
563 struct ieee80211_bss *bss;
564
565 bss = (void *)cbss->priv;
566 #ifdef CONFIG_MAC80211_IBSS_DEBUG
567 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
568 "%pM\n", cbss->bssid, ifibss->bssid);
569 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
570
571 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
572 " based on configured SSID\n",
573 sdata->name, cbss->bssid);
574
575 ieee80211_sta_join_ibss(sdata, bss);
576 ieee80211_rx_bss_put(local, bss);
577 return;
578 }
579
580 #ifdef CONFIG_MAC80211_IBSS_DEBUG
581 printk(KERN_DEBUG " did not try to join ibss\n");
582 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
583
584 /* Selected IBSS not found in current scan results - try to scan */
585 if (time_after(jiffies, ifibss->last_scan_completed +
586 IEEE80211_SCAN_INTERVAL)) {
587 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
588 "join\n", sdata->name);
589
590 ieee80211_request_internal_scan(sdata, ifibss->ssid,
591 ifibss->ssid_len);
592 } else {
593 int interval = IEEE80211_SCAN_INTERVAL;
594
595 if (time_after(jiffies, ifibss->ibss_join_req +
596 IEEE80211_IBSS_JOIN_TIMEOUT)) {
597 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
598 ieee80211_sta_create_ibss(sdata);
599 return;
600 }
601 printk(KERN_DEBUG "%s: IBSS not allowed on"
602 " %d MHz\n", sdata->name,
603 local->hw.conf.channel->center_freq);
604
605 /* No IBSS found - decrease scan interval and continue
606 * scanning. */
607 interval = IEEE80211_SCAN_INTERVAL_SLOW;
608 }
609
610 mod_timer(&ifibss->timer,
611 round_jiffies(jiffies + interval));
612 }
613 }
614
615 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
616 struct ieee80211_mgmt *mgmt,
617 size_t len)
618 {
619 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
620 struct ieee80211_local *local = sdata->local;
621 int tx_last_beacon;
622 struct sk_buff *skb;
623 struct ieee80211_mgmt *resp;
624 u8 *pos, *end;
625
626 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
627 len < 24 + 2 || !ifibss->presp)
628 return;
629
630 tx_last_beacon = drv_tx_last_beacon(local);
631
632 #ifdef CONFIG_MAC80211_IBSS_DEBUG
633 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
634 " (tx_last_beacon=%d)\n",
635 sdata->name, mgmt->sa, mgmt->da,
636 mgmt->bssid, tx_last_beacon);
637 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
638
639 if (!tx_last_beacon)
640 return;
641
642 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
643 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
644 return;
645
646 end = ((u8 *) mgmt) + len;
647 pos = mgmt->u.probe_req.variable;
648 if (pos[0] != WLAN_EID_SSID ||
649 pos + 2 + pos[1] > end) {
650 #ifdef CONFIG_MAC80211_IBSS_DEBUG
651 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
652 "from %pM\n",
653 sdata->name, mgmt->sa);
654 #endif
655 return;
656 }
657 if (pos[1] != 0 &&
658 (pos[1] != ifibss->ssid_len ||
659 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
660 /* Ignore ProbeReq for foreign SSID */
661 return;
662 }
663
664 /* Reply with ProbeResp */
665 skb = skb_copy(ifibss->presp, GFP_KERNEL);
666 if (!skb)
667 return;
668
669 resp = (struct ieee80211_mgmt *) skb->data;
670 memcpy(resp->da, mgmt->sa, ETH_ALEN);
671 #ifdef CONFIG_MAC80211_IBSS_DEBUG
672 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
673 sdata->name, resp->da);
674 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
675 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
676 ieee80211_tx_skb(sdata, skb);
677 }
678
679 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
680 struct ieee80211_mgmt *mgmt,
681 size_t len,
682 struct ieee80211_rx_status *rx_status)
683 {
684 size_t baselen;
685 struct ieee802_11_elems elems;
686
687 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
688 return; /* ignore ProbeResp to foreign address */
689
690 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
691 if (baselen > len)
692 return;
693
694 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
695 &elems);
696
697 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
698 }
699
700 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
701 struct ieee80211_mgmt *mgmt,
702 size_t len,
703 struct ieee80211_rx_status *rx_status)
704 {
705 size_t baselen;
706 struct ieee802_11_elems elems;
707
708 /* Process beacon from the current BSS */
709 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
710 if (baselen > len)
711 return;
712
713 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
714
715 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
716 }
717
718 static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
719 struct sk_buff *skb)
720 {
721 struct ieee80211_rx_status *rx_status;
722 struct ieee80211_mgmt *mgmt;
723 u16 fc;
724
725 rx_status = IEEE80211_SKB_RXCB(skb);
726 mgmt = (struct ieee80211_mgmt *) skb->data;
727 fc = le16_to_cpu(mgmt->frame_control);
728
729 switch (fc & IEEE80211_FCTL_STYPE) {
730 case IEEE80211_STYPE_PROBE_REQ:
731 ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len);
732 break;
733 case IEEE80211_STYPE_PROBE_RESP:
734 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
735 rx_status);
736 break;
737 case IEEE80211_STYPE_BEACON:
738 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
739 rx_status);
740 break;
741 case IEEE80211_STYPE_AUTH:
742 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
743 break;
744 }
745
746 kfree_skb(skb);
747 }
748
749 static void ieee80211_ibss_work(struct work_struct *work)
750 {
751 struct ieee80211_sub_if_data *sdata =
752 container_of(work, struct ieee80211_sub_if_data, u.ibss.work);
753 struct ieee80211_local *local = sdata->local;
754 struct ieee80211_if_ibss *ifibss;
755 struct sk_buff *skb;
756
757 if (WARN_ON(local->suspended))
758 return;
759
760 if (!ieee80211_sdata_running(sdata))
761 return;
762
763 if (local->scanning)
764 return;
765
766 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC))
767 return;
768 ifibss = &sdata->u.ibss;
769
770 while ((skb = skb_dequeue(&ifibss->skb_queue)))
771 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
772
773 if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request))
774 return;
775
776 switch (ifibss->state) {
777 case IEEE80211_IBSS_MLME_SEARCH:
778 ieee80211_sta_find_ibss(sdata);
779 break;
780 case IEEE80211_IBSS_MLME_JOINED:
781 ieee80211_sta_merge_ibss(sdata);
782 break;
783 default:
784 WARN_ON(1);
785 break;
786 }
787 }
788
789 static void ieee80211_ibss_timer(unsigned long data)
790 {
791 struct ieee80211_sub_if_data *sdata =
792 (struct ieee80211_sub_if_data *) data;
793 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
794 struct ieee80211_local *local = sdata->local;
795
796 if (local->quiescing) {
797 ifibss->timer_running = true;
798 return;
799 }
800
801 set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request);
802 ieee80211_queue_work(&local->hw, &ifibss->work);
803 }
804
805 #ifdef CONFIG_PM
806 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
807 {
808 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
809
810 cancel_work_sync(&ifibss->work);
811 if (del_timer_sync(&ifibss->timer))
812 ifibss->timer_running = true;
813 }
814
815 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
816 {
817 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
818
819 if (ifibss->timer_running) {
820 add_timer(&ifibss->timer);
821 ifibss->timer_running = false;
822 }
823 }
824 #endif
825
826 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
827 {
828 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
829
830 INIT_WORK(&ifibss->work, ieee80211_ibss_work);
831 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
832 (unsigned long) sdata);
833 skb_queue_head_init(&ifibss->skb_queue);
834 }
835
836 /* scan finished notification */
837 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
838 {
839 struct ieee80211_sub_if_data *sdata;
840
841 mutex_lock(&local->iflist_mtx);
842 list_for_each_entry(sdata, &local->interfaces, list) {
843 if (!ieee80211_sdata_running(sdata))
844 continue;
845 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
846 continue;
847 if (!sdata->u.ibss.ssid_len)
848 continue;
849 sdata->u.ibss.last_scan_completed = jiffies;
850 mod_timer(&sdata->u.ibss.timer, 0);
851 }
852 mutex_unlock(&local->iflist_mtx);
853 }
854
855 ieee80211_rx_result
856 ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
857 {
858 struct ieee80211_local *local = sdata->local;
859 struct ieee80211_mgmt *mgmt;
860 u16 fc;
861
862 if (skb->len < 24)
863 return RX_DROP_MONITOR;
864
865 mgmt = (struct ieee80211_mgmt *) skb->data;
866 fc = le16_to_cpu(mgmt->frame_control);
867
868 switch (fc & IEEE80211_FCTL_STYPE) {
869 case IEEE80211_STYPE_PROBE_RESP:
870 case IEEE80211_STYPE_BEACON:
871 case IEEE80211_STYPE_PROBE_REQ:
872 case IEEE80211_STYPE_AUTH:
873 skb_queue_tail(&sdata->u.ibss.skb_queue, skb);
874 ieee80211_queue_work(&local->hw, &sdata->u.ibss.work);
875 return RX_QUEUED;
876 }
877
878 return RX_DROP_MONITOR;
879 }
880
881 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
882 struct cfg80211_ibss_params *params)
883 {
884 struct sk_buff *skb;
885
886 if (params->bssid) {
887 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
888 sdata->u.ibss.fixed_bssid = true;
889 } else
890 sdata->u.ibss.fixed_bssid = false;
891
892 sdata->u.ibss.privacy = params->privacy;
893
894 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
895
896 sdata->u.ibss.channel = params->channel;
897 sdata->u.ibss.fixed_channel = params->channel_fixed;
898
899 if (params->ie) {
900 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
901 GFP_KERNEL);
902 if (sdata->u.ibss.ie)
903 sdata->u.ibss.ie_len = params->ie_len;
904 }
905
906 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
907 36 /* bitrates */ +
908 34 /* SSID */ +
909 3 /* DS params */ +
910 4 /* IBSS params */ +
911 params->ie_len);
912 if (!skb)
913 return -ENOMEM;
914
915 sdata->u.ibss.skb = skb;
916 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
917 sdata->u.ibss.ibss_join_req = jiffies;
918
919 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
920
921 /*
922 * The ssid_len setting below is used to see whether
923 * we are active, and we need all other settings
924 * before that may get visible.
925 */
926 mb();
927
928 sdata->u.ibss.ssid_len = params->ssid_len;
929
930 ieee80211_recalc_idle(sdata->local);
931
932 set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
933 ieee80211_queue_work(&sdata->local->hw, &sdata->u.ibss.work);
934
935 return 0;
936 }
937
938 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
939 {
940 struct sk_buff *skb;
941
942 del_timer_sync(&sdata->u.ibss.timer);
943 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
944 cancel_work_sync(&sdata->u.ibss.work);
945 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
946
947 sta_info_flush(sdata->local, sdata);
948
949 /* remove beacon */
950 kfree(sdata->u.ibss.ie);
951 skb = sdata->u.ibss.presp;
952 rcu_assign_pointer(sdata->u.ibss.presp, NULL);
953 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
954 synchronize_rcu();
955 kfree_skb(skb);
956
957 skb_queue_purge(&sdata->u.ibss.skb_queue);
958 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
959 sdata->u.ibss.ssid_len = 0;
960
961 ieee80211_recalc_idle(sdata->local);
962
963 return 0;
964 }
Mirror of NV Tegra kernel