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writeback: split writeback_inodes_wb
[linux-2.6/next.git] / net / mac80211 / ibss.c
blobb2cc1fda6cfdb6ba1054aa2bb224f9fce7bba5e8
1 /*
2 * IBSS mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15 #include <linux/delay.h>
16 #include <linux/slab.h>
17 #include <linux/if_ether.h>
18 #include <linux/skbuff.h>
19 #include <linux/if_arp.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rtnetlink.h>
22 #include <net/mac80211.h>
23 #include <asm/unaligned.h>
24
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
27 #include "rate.h"
28
29 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
30 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
31 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
32
33 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
34 #define IEEE80211_IBSS_MERGE_DELAY 0x400000
35 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
36
37 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
38
39
40 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
41 struct ieee80211_mgmt *mgmt,
42 size_t len)
43 {
44 u16 auth_alg, auth_transaction, status_code;
45
46 if (len < 24 + 6)
47 return;
48
49 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
50 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
51 status_code = le16_to_cpu(mgmt->u.auth.status_code);
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 /* Reset own TSF to allow time synchronization work. */
82 drv_reset_tsf(local);
83
84 skb = ifibss->skb;
85 rcu_assign_pointer(ifibss->presp, NULL);
86 synchronize_rcu();
87 skb->data = skb->head;
88 skb->len = 0;
89 skb_reset_tail_pointer(skb);
90 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
91
92 if (memcmp(ifibss->bssid, bssid, ETH_ALEN))
93 sta_info_flush(sdata->local, sdata);
94
95 /* if merging, indicate to driver that we leave the old IBSS */
96 if (sdata->vif.bss_conf.ibss_joined) {
97 sdata->vif.bss_conf.ibss_joined = false;
98 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS);
99 }
100
101 memcpy(ifibss->bssid, bssid, ETH_ALEN);
102
103 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
104
105 local->oper_channel = chan;
106 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
107 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
108
109 sband = local->hw.wiphy->bands[chan->band];
110
111 /* build supported rates array */
112 pos = supp_rates;
113 for (i = 0; i < sband->n_bitrates; i++) {
114 int rate = sband->bitrates[i].bitrate;
115 u8 basic = 0;
116 if (basic_rates & BIT(i))
117 basic = 0x80;
118 *pos++ = basic | (u8) (rate / 5);
119 }
120
121 /* Build IBSS probe response */
122 mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
123 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
124 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
125 IEEE80211_STYPE_PROBE_RESP);
126 memset(mgmt->da, 0xff, ETH_ALEN);
127 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
128 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
129 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
130 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
131 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
132
133 pos = skb_put(skb, 2 + ifibss->ssid_len);
134 *pos++ = WLAN_EID_SSID;
135 *pos++ = ifibss->ssid_len;
136 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
137
138 rates = sband->n_bitrates;
139 if (rates > 8)
140 rates = 8;
141 pos = skb_put(skb, 2 + rates);
142 *pos++ = WLAN_EID_SUPP_RATES;
143 *pos++ = rates;
144 memcpy(pos, supp_rates, rates);
145
146 if (sband->band == IEEE80211_BAND_2GHZ) {
147 pos = skb_put(skb, 2 + 1);
148 *pos++ = WLAN_EID_DS_PARAMS;
149 *pos++ = 1;
150 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
151 }
152
153 pos = skb_put(skb, 2 + 2);
154 *pos++ = WLAN_EID_IBSS_PARAMS;
155 *pos++ = 2;
156 /* FIX: set ATIM window based on scan results */
157 *pos++ = 0;
158 *pos++ = 0;
159
160 if (sband->n_bitrates > 8) {
161 rates = sband->n_bitrates - 8;
162 pos = skb_put(skb, 2 + rates);
163 *pos++ = WLAN_EID_EXT_SUPP_RATES;
164 *pos++ = rates;
165 memcpy(pos, &supp_rates[8], rates);
166 }
167
168 if (ifibss->ie_len)
169 memcpy(skb_put(skb, ifibss->ie_len),
170 ifibss->ie, ifibss->ie_len);
171
172 rcu_assign_pointer(ifibss->presp, skb);
173
174 sdata->vif.bss_conf.beacon_int = beacon_int;
175 bss_change = BSS_CHANGED_BEACON_INT;
176 bss_change |= ieee80211_reset_erp_info(sdata);
177 bss_change |= BSS_CHANGED_BSSID;
178 bss_change |= BSS_CHANGED_BEACON;
179 bss_change |= BSS_CHANGED_BEACON_ENABLED;
180 bss_change |= BSS_CHANGED_IBSS;
181 sdata->vif.bss_conf.ibss_joined = true;
182 ieee80211_bss_info_change_notify(sdata, bss_change);
183
184 ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
185
186 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
187 mod_timer(&ifibss->timer,
188 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
189
190 bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
191 mgmt, skb->len, 0, GFP_KERNEL);
192 cfg80211_put_bss(bss);
193 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
194 }
195
196 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
197 struct ieee80211_bss *bss)
198 {
199 struct cfg80211_bss *cbss =
200 container_of((void *)bss, struct cfg80211_bss, priv);
201 struct ieee80211_supported_band *sband;
202 u32 basic_rates;
203 int i, j;
204 u16 beacon_int = cbss->beacon_interval;
205
206 if (beacon_int < 10)
207 beacon_int = 10;
208
209 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
210
211 basic_rates = 0;
212
213 for (i = 0; i < bss->supp_rates_len; i++) {
214 int rate = (bss->supp_rates[i] & 0x7f) * 5;
215 bool is_basic = !!(bss->supp_rates[i] & 0x80);
216
217 for (j = 0; j < sband->n_bitrates; j++) {
218 if (sband->bitrates[j].bitrate == rate) {
219 if (is_basic)
220 basic_rates |= BIT(j);
221 break;
222 }
223 }
224 }
225
226 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
227 beacon_int,
228 cbss->channel,
229 basic_rates,
230 cbss->capability,
231 cbss->tsf);
232 }
233
234 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
235 struct ieee80211_mgmt *mgmt,
236 size_t len,
237 struct ieee80211_rx_status *rx_status,
238 struct ieee802_11_elems *elems,
239 bool beacon)
240 {
241 struct ieee80211_local *local = sdata->local;
242 int freq;
243 struct cfg80211_bss *cbss;
244 struct ieee80211_bss *bss;
245 struct sta_info *sta;
246 struct ieee80211_channel *channel;
247 u64 beacon_timestamp, rx_timestamp;
248 u32 supp_rates = 0;
249 enum ieee80211_band band = rx_status->band;
250
251 if (elems->ds_params && elems->ds_params_len == 1)
252 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
253 else
254 freq = rx_status->freq;
255
256 channel = ieee80211_get_channel(local->hw.wiphy, freq);
257
258 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
259 return;
260
261 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
262 memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) {
263 supp_rates = ieee80211_sta_get_rates(local, elems, band);
264
265 rcu_read_lock();
266
267 sta = sta_info_get(sdata, mgmt->sa);
268 if (sta) {
269 u32 prev_rates;
270
271 prev_rates = sta->sta.supp_rates[band];
272 /* make sure mandatory rates are always added */
273 sta->sta.supp_rates[band] = supp_rates |
274 ieee80211_mandatory_rates(local, band);
275
276 if (sta->sta.supp_rates[band] != prev_rates) {
277 #ifdef CONFIG_MAC80211_IBSS_DEBUG
278 printk(KERN_DEBUG "%s: updated supp_rates set "
279 "for %pM based on beacon/probe_response "
280 "(0x%x -> 0x%x)\n",
281 sdata->name, sta->sta.addr,
282 prev_rates, sta->sta.supp_rates[band]);
283 #endif
284 rate_control_rate_init(sta);
285 }
286 rcu_read_unlock();
287 } else {
288 rcu_read_unlock();
289 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
290 supp_rates, GFP_KERNEL);
291 }
292 }
293
294 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
295 channel, beacon);
296 if (!bss)
297 return;
298
299 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
300
301 /* was just updated in ieee80211_bss_info_update */
302 beacon_timestamp = cbss->tsf;
303
304 /* check if we need to merge IBSS */
305
306 /* we use a fixed BSSID */
307 if (sdata->u.ibss.fixed_bssid)
308 goto put_bss;
309
310 /* not an IBSS */
311 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
312 goto put_bss;
313
314 /* different channel */
315 if (cbss->channel != local->oper_channel)
316 goto put_bss;
317
318 /* different SSID */
319 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
320 memcmp(elems->ssid, sdata->u.ibss.ssid,
321 sdata->u.ibss.ssid_len))
322 goto put_bss;
323
324 /* same BSSID */
325 if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0)
326 goto put_bss;
327
328 if (rx_status->flag & RX_FLAG_TSFT) {
329 /*
330 * For correct IBSS merging we need mactime; since mactime is
331 * defined as the time the first data symbol of the frame hits
332 * the PHY, and the timestamp of the beacon is defined as "the
333 * time that the data symbol containing the first bit of the
334 * timestamp is transmitted to the PHY plus the transmitting
335 * STA's delays through its local PHY from the MAC-PHY
336 * interface to its interface with the WM" (802.11 11.1.2)
337 * - equals the time this bit arrives at the receiver - we have
338 * to take into account the offset between the two.
339 *
340 * E.g. at 1 MBit that means mactime is 192 usec earlier
341 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
342 */
343 int rate;
344
345 if (rx_status->flag & RX_FLAG_HT)
346 rate = 65; /* TODO: HT rates */
347 else
348 rate = local->hw.wiphy->bands[band]->
349 bitrates[rx_status->rate_idx].bitrate;
350
351 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
352 } else {
353 /*
354 * second best option: get current TSF
355 * (will return -1 if not supported)
356 */
357 rx_timestamp = drv_get_tsf(local);
358 }
359
360 #ifdef CONFIG_MAC80211_IBSS_DEBUG
361 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
362 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
363 mgmt->sa, mgmt->bssid,
364 (unsigned long long)rx_timestamp,
365 (unsigned long long)beacon_timestamp,
366 (unsigned long long)(rx_timestamp - beacon_timestamp),
367 jiffies);
368 #endif
369
370 /* give slow hardware some time to do the TSF sync */
371 if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY)
372 goto put_bss;
373
374 if (beacon_timestamp > rx_timestamp) {
375 #ifdef CONFIG_MAC80211_IBSS_DEBUG
376 printk(KERN_DEBUG "%s: beacon TSF higher than "
377 "local TSF - IBSS merge with BSSID %pM\n",
378 sdata->name, mgmt->bssid);
379 #endif
380 ieee80211_sta_join_ibss(sdata, bss);
381 supp_rates = ieee80211_sta_get_rates(local, elems, band);
382 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
383 supp_rates, GFP_KERNEL);
384 }
385
386 put_bss:
387 ieee80211_rx_bss_put(local, bss);
388 }
389
390 /*
391 * Add a new IBSS station, will also be called by the RX code when,
392 * in IBSS mode, receiving a frame from a yet-unknown station, hence
393 * must be callable in atomic context.
394 */
395 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
396 u8 *bssid,u8 *addr, u32 supp_rates,
397 gfp_t gfp)
398 {
399 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
400 struct ieee80211_local *local = sdata->local;
401 struct sta_info *sta;
402 int band = local->hw.conf.channel->band;
403
404 /*
405 * XXX: Consider removing the least recently used entry and
406 * allow new one to be added.
407 */
408 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
409 if (net_ratelimit())
410 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
411 sdata->name, addr);
412 return NULL;
413 }
414
415 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
416 return NULL;
417
418 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
419 return NULL;
420
421 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
422 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
423 wiphy_name(local->hw.wiphy), addr, sdata->name);
424 #endif
425
426 sta = sta_info_alloc(sdata, addr, gfp);
427 if (!sta)
428 return NULL;
429
430 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
431
432 /* make sure mandatory rates are always added */
433 sta->sta.supp_rates[band] = supp_rates |
434 ieee80211_mandatory_rates(local, band);
435
436 rate_control_rate_init(sta);
437
438 /* If it fails, maybe we raced another insertion? */
439 if (sta_info_insert(sta))
440 return sta_info_get(sdata, addr);
441 return sta;
442 }
443
444 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
445 {
446 struct ieee80211_local *local = sdata->local;
447 int active = 0;
448 struct sta_info *sta;
449
450 rcu_read_lock();
451
452 list_for_each_entry_rcu(sta, &local->sta_list, list) {
453 if (sta->sdata == sdata &&
454 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
455 jiffies)) {
456 active++;
457 break;
458 }
459 }
460
461 rcu_read_unlock();
462
463 return active;
464 }
465
466 /*
467 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
468 */
469
470 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
471 {
472 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
473
474 mod_timer(&ifibss->timer,
475 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
476
477 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
478
479 if (time_before(jiffies, ifibss->last_scan_completed +
480 IEEE80211_IBSS_MERGE_INTERVAL))
481 return;
482
483 if (ieee80211_sta_active_ibss(sdata))
484 return;
485
486 if (ifibss->fixed_channel)
487 return;
488
489 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
490 "IBSS networks with same SSID (merge)\n", sdata->name);
491
492 ieee80211_request_internal_scan(sdata,
493 ifibss->ssid, ifibss->ssid_len,
494 ifibss->fixed_channel ? ifibss->channel : NULL);
495 }
496
497 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
498 {
499 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
500 struct ieee80211_local *local = sdata->local;
501 struct ieee80211_supported_band *sband;
502 u8 bssid[ETH_ALEN];
503 u16 capability;
504 int i;
505
506 if (ifibss->fixed_bssid) {
507 memcpy(bssid, ifibss->bssid, ETH_ALEN);
508 } else {
509 /* Generate random, not broadcast, locally administered BSSID. Mix in
510 * own MAC address to make sure that devices that do not have proper
511 * random number generator get different BSSID. */
512 get_random_bytes(bssid, ETH_ALEN);
513 for (i = 0; i < ETH_ALEN; i++)
514 bssid[i] ^= sdata->vif.addr[i];
515 bssid[0] &= ~0x01;
516 bssid[0] |= 0x02;
517 }
518
519 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
520 sdata->name, bssid);
521
522 sband = local->hw.wiphy->bands[ifibss->channel->band];
523
524 capability = WLAN_CAPABILITY_IBSS;
525
526 if (ifibss->privacy)
527 capability |= WLAN_CAPABILITY_PRIVACY;
528 else
529 sdata->drop_unencrypted = 0;
530
531 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
532 ifibss->channel, 3, /* first two are basic */
533 capability, 0);
534 }
535
536 /*
537 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
538 */
539
540 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
541 {
542 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
543 struct ieee80211_local *local = sdata->local;
544 struct cfg80211_bss *cbss;
545 struct ieee80211_channel *chan = NULL;
546 const u8 *bssid = NULL;
547 int active_ibss;
548 u16 capability;
549
550 active_ibss = ieee80211_sta_active_ibss(sdata);
551 #ifdef CONFIG_MAC80211_IBSS_DEBUG
552 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
553 sdata->name, active_ibss);
554 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
555
556 if (active_ibss)
557 return;
558
559 capability = WLAN_CAPABILITY_IBSS;
560 if (ifibss->privacy)
561 capability |= WLAN_CAPABILITY_PRIVACY;
562 if (ifibss->fixed_bssid)
563 bssid = ifibss->bssid;
564 if (ifibss->fixed_channel)
565 chan = ifibss->channel;
566 if (!is_zero_ether_addr(ifibss->bssid))
567 bssid = ifibss->bssid;
568 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
569 ifibss->ssid, ifibss->ssid_len,
570 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
571 capability);
572
573 if (cbss) {
574 struct ieee80211_bss *bss;
575
576 bss = (void *)cbss->priv;
577 #ifdef CONFIG_MAC80211_IBSS_DEBUG
578 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
579 "%pM\n", cbss->bssid, ifibss->bssid);
580 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
581
582 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
583 " based on configured SSID\n",
584 sdata->name, cbss->bssid);
585
586 ieee80211_sta_join_ibss(sdata, bss);
587 ieee80211_rx_bss_put(local, bss);
588 return;
589 }
590
591 #ifdef CONFIG_MAC80211_IBSS_DEBUG
592 printk(KERN_DEBUG " did not try to join ibss\n");
593 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
594
595 /* Selected IBSS not found in current scan results - try to scan */
596 if (time_after(jiffies, ifibss->last_scan_completed +
597 IEEE80211_SCAN_INTERVAL)) {
598 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
599 "join\n", sdata->name);
600
601 ieee80211_request_internal_scan(sdata,
602 ifibss->ssid, ifibss->ssid_len,
603 ifibss->fixed_channel ? ifibss->channel : NULL);
604 } else {
605 int interval = IEEE80211_SCAN_INTERVAL;
606
607 if (time_after(jiffies, ifibss->ibss_join_req +
608 IEEE80211_IBSS_JOIN_TIMEOUT)) {
609 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
610 ieee80211_sta_create_ibss(sdata);
611 return;
612 }
613 printk(KERN_DEBUG "%s: IBSS not allowed on"
614 " %d MHz\n", sdata->name,
615 local->hw.conf.channel->center_freq);
616
617 /* No IBSS found - decrease scan interval and continue
618 * scanning. */
619 interval = IEEE80211_SCAN_INTERVAL_SLOW;
620 }
621
622 mod_timer(&ifibss->timer,
623 round_jiffies(jiffies + interval));
624 }
625 }
626
627 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
628 struct ieee80211_mgmt *mgmt,
629 size_t len)
630 {
631 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
632 struct ieee80211_local *local = sdata->local;
633 int tx_last_beacon;
634 struct sk_buff *skb;
635 struct ieee80211_mgmt *resp;
636 u8 *pos, *end;
637
638 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
639 len < 24 + 2 || !ifibss->presp)
640 return;
641
642 tx_last_beacon = drv_tx_last_beacon(local);
643
644 #ifdef CONFIG_MAC80211_IBSS_DEBUG
645 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
646 " (tx_last_beacon=%d)\n",
647 sdata->name, mgmt->sa, mgmt->da,
648 mgmt->bssid, tx_last_beacon);
649 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
650
651 if (!tx_last_beacon)
652 return;
653
654 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
655 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
656 return;
657
658 end = ((u8 *) mgmt) + len;
659 pos = mgmt->u.probe_req.variable;
660 if (pos[0] != WLAN_EID_SSID ||
661 pos + 2 + pos[1] > end) {
662 #ifdef CONFIG_MAC80211_IBSS_DEBUG
663 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
664 "from %pM\n",
665 sdata->name, mgmt->sa);
666 #endif
667 return;
668 }
669 if (pos[1] != 0 &&
670 (pos[1] != ifibss->ssid_len ||
671 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
672 /* Ignore ProbeReq for foreign SSID */
673 return;
674 }
675
676 /* Reply with ProbeResp */
677 skb = skb_copy(ifibss->presp, GFP_KERNEL);
678 if (!skb)
679 return;
680
681 resp = (struct ieee80211_mgmt *) skb->data;
682 memcpy(resp->da, mgmt->sa, ETH_ALEN);
683 #ifdef CONFIG_MAC80211_IBSS_DEBUG
684 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
685 sdata->name, resp->da);
686 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
687 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
688 ieee80211_tx_skb(sdata, skb);
689 }
690
691 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
692 struct ieee80211_mgmt *mgmt,
693 size_t len,
694 struct ieee80211_rx_status *rx_status)
695 {
696 size_t baselen;
697 struct ieee802_11_elems elems;
698
699 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
700 return; /* ignore ProbeResp to foreign address */
701
702 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
703 if (baselen > len)
704 return;
705
706 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
707 &elems);
708
709 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
710 }
711
712 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
713 struct ieee80211_mgmt *mgmt,
714 size_t len,
715 struct ieee80211_rx_status *rx_status)
716 {
717 size_t baselen;
718 struct ieee802_11_elems elems;
719
720 /* Process beacon from the current BSS */
721 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
722 if (baselen > len)
723 return;
724
725 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
726
727 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
728 }
729
730 static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
731 struct sk_buff *skb)
732 {
733 struct ieee80211_rx_status *rx_status;
734 struct ieee80211_mgmt *mgmt;
735 u16 fc;
736
737 rx_status = IEEE80211_SKB_RXCB(skb);
738 mgmt = (struct ieee80211_mgmt *) skb->data;
739 fc = le16_to_cpu(mgmt->frame_control);
740
741 switch (fc & IEEE80211_FCTL_STYPE) {
742 case IEEE80211_STYPE_PROBE_REQ:
743 ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len);
744 break;
745 case IEEE80211_STYPE_PROBE_RESP:
746 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
747 rx_status);
748 break;
749 case IEEE80211_STYPE_BEACON:
750 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
751 rx_status);
752 break;
753 case IEEE80211_STYPE_AUTH:
754 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
755 break;
756 }
757
758 kfree_skb(skb);
759 }
760
761 static void ieee80211_ibss_work(struct work_struct *work)
762 {
763 struct ieee80211_sub_if_data *sdata =
764 container_of(work, struct ieee80211_sub_if_data, u.ibss.work);
765 struct ieee80211_local *local = sdata->local;
766 struct ieee80211_if_ibss *ifibss;
767 struct sk_buff *skb;
768
769 if (WARN_ON(local->suspended))
770 return;
771
772 if (!ieee80211_sdata_running(sdata))
773 return;
774
775 if (local->scanning)
776 return;
777
778 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC))
779 return;
780 ifibss = &sdata->u.ibss;
781
782 while ((skb = skb_dequeue(&ifibss->skb_queue)))
783 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
784
785 if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request))
786 return;
787
788 switch (ifibss->state) {
789 case IEEE80211_IBSS_MLME_SEARCH:
790 ieee80211_sta_find_ibss(sdata);
791 break;
792 case IEEE80211_IBSS_MLME_JOINED:
793 ieee80211_sta_merge_ibss(sdata);
794 break;
795 default:
796 WARN_ON(1);
797 break;
798 }
799 }
800
801 static void ieee80211_ibss_timer(unsigned long data)
802 {
803 struct ieee80211_sub_if_data *sdata =
804 (struct ieee80211_sub_if_data *) data;
805 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
806 struct ieee80211_local *local = sdata->local;
807
808 if (local->quiescing) {
809 ifibss->timer_running = true;
810 return;
811 }
812
813 set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request);
814 ieee80211_queue_work(&local->hw, &ifibss->work);
815 }
816
817 #ifdef CONFIG_PM
818 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
819 {
820 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
821
822 cancel_work_sync(&ifibss->work);
823 if (del_timer_sync(&ifibss->timer))
824 ifibss->timer_running = true;
825 }
826
827 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
828 {
829 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
830
831 if (ifibss->timer_running) {
832 add_timer(&ifibss->timer);
833 ifibss->timer_running = false;
834 }
835 }
836 #endif
837
838 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
839 {
840 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
841
842 INIT_WORK(&ifibss->work, ieee80211_ibss_work);
843 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
844 (unsigned long) sdata);
845 skb_queue_head_init(&ifibss->skb_queue);
846 }
847
848 /* scan finished notification */
849 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
850 {
851 struct ieee80211_sub_if_data *sdata;
852
853 mutex_lock(&local->iflist_mtx);
854 list_for_each_entry(sdata, &local->interfaces, list) {
855 if (!ieee80211_sdata_running(sdata))
856 continue;
857 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
858 continue;
859 if (!sdata->u.ibss.ssid_len)
860 continue;
861 sdata->u.ibss.last_scan_completed = jiffies;
862 mod_timer(&sdata->u.ibss.timer, 0);
863 }
864 mutex_unlock(&local->iflist_mtx);
865 }
866
867 ieee80211_rx_result
868 ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
869 {
870 struct ieee80211_local *local = sdata->local;
871 struct ieee80211_mgmt *mgmt;
872 u16 fc;
873
874 if (skb->len < 24)
875 return RX_DROP_MONITOR;
876
877 mgmt = (struct ieee80211_mgmt *) skb->data;
878 fc = le16_to_cpu(mgmt->frame_control);
879
880 switch (fc & IEEE80211_FCTL_STYPE) {
881 case IEEE80211_STYPE_PROBE_RESP:
882 case IEEE80211_STYPE_BEACON:
883 case IEEE80211_STYPE_PROBE_REQ:
884 case IEEE80211_STYPE_AUTH:
885 skb_queue_tail(&sdata->u.ibss.skb_queue, skb);
886 ieee80211_queue_work(&local->hw, &sdata->u.ibss.work);
887 return RX_QUEUED;
888 }
889
890 return RX_DROP_MONITOR;
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 if (params->bssid) {
899 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
900 sdata->u.ibss.fixed_bssid = true;
901 } else
902 sdata->u.ibss.fixed_bssid = false;
903
904 sdata->u.ibss.privacy = params->privacy;
905
906 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
907
908 sdata->u.ibss.channel = params->channel;
909 sdata->u.ibss.fixed_channel = params->channel_fixed;
910
911 /* fix ourselves to that channel now already */
912 if (params->channel_fixed) {
913 sdata->local->oper_channel = params->channel;
914 WARN_ON(!ieee80211_set_channel_type(sdata->local, sdata,
915 NL80211_CHAN_NO_HT));
916 }
917
918 if (params->ie) {
919 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
920 GFP_KERNEL);
921 if (sdata->u.ibss.ie)
922 sdata->u.ibss.ie_len = params->ie_len;
923 }
924
925 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
926 36 /* bitrates */ +
927 34 /* SSID */ +
928 3 /* DS params */ +
929 4 /* IBSS params */ +
930 params->ie_len);
931 if (!skb)
932 return -ENOMEM;
933
934 sdata->u.ibss.skb = skb;
935 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
936 sdata->u.ibss.ibss_join_req = jiffies;
937
938 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
939
940 /*
941 * The ssid_len setting below is used to see whether
942 * we are active, and we need all other settings
943 * before that may get visible.
944 */
945 mb();
946
947 sdata->u.ibss.ssid_len = params->ssid_len;
948
949 ieee80211_recalc_idle(sdata->local);
950
951 set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
952 ieee80211_queue_work(&sdata->local->hw, &sdata->u.ibss.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
961 del_timer_sync(&sdata->u.ibss.timer);
962 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
963 cancel_work_sync(&sdata->u.ibss.work);
964 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
965
966 sta_info_flush(sdata->local, sdata);
967
968 /* remove beacon */
969 kfree(sdata->u.ibss.ie);
970 skb = sdata->u.ibss.presp;
971 rcu_assign_pointer(sdata->u.ibss.presp, NULL);
972 sdata->vif.bss_conf.ibss_joined = false;
973 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
974 BSS_CHANGED_IBSS);
975 synchronize_rcu();
976 kfree_skb(skb);
977
978 skb_queue_purge(&sdata->u.ibss.skb_queue);
979 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
980 sdata->u.ibss.ssid_len = 0;
981
982 ieee80211_recalc_idle(sdata->local);
983
984 return 0;
985 }
linux-next