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initial commit with v2.6.32.60
[linux-2.6.32.60-moxart.git] / net / mac80211 / ibss.c
blob07600a6871a850536cf29cb6b321aa2dd5755a9d
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->dev->dev_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 ieee80211_supported_band *sband;
191 u32 basic_rates;
192 int i, j;
193 u16 beacon_int = bss->cbss.beacon_interval;
194
195 if (beacon_int < 10)
196 beacon_int = 10;
197
198 sband = sdata->local->hw.wiphy->bands[bss->cbss.channel->band];
199
200 basic_rates = 0;
201
202 for (i = 0; i < bss->supp_rates_len; i++) {
203 int rate = (bss->supp_rates[i] & 0x7f) * 5;
204 bool is_basic = !!(bss->supp_rates[i] & 0x80);
205
206 for (j = 0; j < sband->n_bitrates; j++) {
207 if (sband->bitrates[j].bitrate == rate) {
208 if (is_basic)
209 basic_rates |= BIT(j);
210 break;
211 }
212 }
213 }
214
215 __ieee80211_sta_join_ibss(sdata, bss->cbss.bssid,
216 beacon_int,
217 bss->cbss.channel,
218 basic_rates,
219 bss->cbss.capability,
220 bss->cbss.tsf);
221 }
222
223 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
224 struct ieee80211_mgmt *mgmt,
225 size_t len,
226 struct ieee80211_rx_status *rx_status,
227 struct ieee802_11_elems *elems,
228 bool beacon)
229 {
230 struct ieee80211_local *local = sdata->local;
231 int freq;
232 struct ieee80211_bss *bss;
233 struct sta_info *sta;
234 struct ieee80211_channel *channel;
235 u64 beacon_timestamp, rx_timestamp;
236 u32 supp_rates = 0;
237 enum ieee80211_band band = rx_status->band;
238
239 if (elems->ds_params && elems->ds_params_len == 1)
240 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
241 else
242 freq = rx_status->freq;
243
244 channel = ieee80211_get_channel(local->hw.wiphy, freq);
245
246 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
247 return;
248
249 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
250 memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) {
251 supp_rates = ieee80211_sta_get_rates(local, elems, band);
252
253 rcu_read_lock();
254
255 sta = sta_info_get(local, mgmt->sa);
256 if (sta) {
257 u32 prev_rates;
258
259 prev_rates = sta->sta.supp_rates[band];
260 /* make sure mandatory rates are always added */
261 sta->sta.supp_rates[band] = supp_rates |
262 ieee80211_mandatory_rates(local, band);
263
264 #ifdef CONFIG_MAC80211_IBSS_DEBUG
265 if (sta->sta.supp_rates[band] != prev_rates)
266 printk(KERN_DEBUG "%s: updated supp_rates set "
267 "for %pM based on beacon info (0x%llx | "
268 "0x%llx -> 0x%llx)\n",
269 sdata->dev->name,
270 sta->sta.addr,
271 (unsigned long long) prev_rates,
272 (unsigned long long) supp_rates,
273 (unsigned long long) sta->sta.supp_rates[band]);
274 #endif
275 } else
276 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
277
278 rcu_read_unlock();
279 }
280
281 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
282 channel, beacon);
283 if (!bss)
284 return;
285
286 /* was just updated in ieee80211_bss_info_update */
287 beacon_timestamp = bss->cbss.tsf;
288
289 /* check if we need to merge IBSS */
290
291 /* merge only on beacons (???) */
292 if (!beacon)
293 goto put_bss;
294
295 /* we use a fixed BSSID */
296 if (sdata->u.ibss.bssid)
297 goto put_bss;
298
299 /* not an IBSS */
300 if (!(bss->cbss.capability & WLAN_CAPABILITY_IBSS))
301 goto put_bss;
302
303 /* different channel */
304 if (bss->cbss.channel != local->oper_channel)
305 goto put_bss;
306
307 /* different SSID */
308 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
309 memcmp(elems->ssid, sdata->u.ibss.ssid,
310 sdata->u.ibss.ssid_len))
311 goto put_bss;
312
313 /* same BSSID */
314 if (memcmp(bss->cbss.bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0)
315 goto put_bss;
316
317 if (rx_status->flag & RX_FLAG_TSFT) {
318 /*
319 * For correct IBSS merging we need mactime; since mactime is
320 * defined as the time the first data symbol of the frame hits
321 * the PHY, and the timestamp of the beacon is defined as "the
322 * time that the data symbol containing the first bit of the
323 * timestamp is transmitted to the PHY plus the transmitting
324 * STA's delays through its local PHY from the MAC-PHY
325 * interface to its interface with the WM" (802.11 11.1.2)
326 * - equals the time this bit arrives at the receiver - we have
327 * to take into account the offset between the two.
328 *
329 * E.g. at 1 MBit that means mactime is 192 usec earlier
330 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
331 */
332 int rate;
333
334 if (rx_status->flag & RX_FLAG_HT)
335 rate = 65; /* TODO: HT rates */
336 else
337 rate = local->hw.wiphy->bands[band]->
338 bitrates[rx_status->rate_idx].bitrate;
339
340 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
341 } else {
342 /*
343 * second best option: get current TSF
344 * (will return -1 if not supported)
345 */
346 rx_timestamp = drv_get_tsf(local);
347 }
348
349 #ifdef CONFIG_MAC80211_IBSS_DEBUG
350 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
351 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
352 mgmt->sa, mgmt->bssid,
353 (unsigned long long)rx_timestamp,
354 (unsigned long long)beacon_timestamp,
355 (unsigned long long)(rx_timestamp - beacon_timestamp),
356 jiffies);
357 #endif
358
359 /* give slow hardware some time to do the TSF sync */
360 if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY)
361 goto put_bss;
362
363 if (beacon_timestamp > rx_timestamp) {
364 #ifdef CONFIG_MAC80211_IBSS_DEBUG
365 printk(KERN_DEBUG "%s: beacon TSF higher than "
366 "local TSF - IBSS merge with BSSID %pM\n",
367 sdata->dev->name, mgmt->bssid);
368 #endif
369 ieee80211_sta_join_ibss(sdata, bss);
370 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
371 }
372
373 put_bss:
374 ieee80211_rx_bss_put(local, bss);
375 }
376
377 /*
378 * Add a new IBSS station, will also be called by the RX code when,
379 * in IBSS mode, receiving a frame from a yet-unknown station, hence
380 * must be callable in atomic context.
381 */
382 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
383 u8 *bssid,u8 *addr, u32 supp_rates)
384 {
385 struct ieee80211_local *local = sdata->local;
386 struct sta_info *sta;
387 int band = local->hw.conf.channel->band;
388
389 /*
390 * XXX: Consider removing the least recently used entry and
391 * allow new one to be added.
392 */
393 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
394 if (net_ratelimit())
395 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
396 sdata->dev->name, addr);
397 return NULL;
398 }
399
400 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
401 return NULL;
402
403 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
404 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
405 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
406 #endif
407
408 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
409 if (!sta)
410 return NULL;
411
412 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
413
414 /* make sure mandatory rates are always added */
415 sta->sta.supp_rates[band] = supp_rates |
416 ieee80211_mandatory_rates(local, band);
417
418 rate_control_rate_init(sta);
419
420 if (sta_info_insert(sta))
421 return NULL;
422
423 return sta;
424 }
425
426 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
427 {
428 struct ieee80211_local *local = sdata->local;
429 int active = 0;
430 struct sta_info *sta;
431
432 rcu_read_lock();
433
434 list_for_each_entry_rcu(sta, &local->sta_list, list) {
435 if (sta->sdata == sdata &&
436 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
437 jiffies)) {
438 active++;
439 break;
440 }
441 }
442
443 rcu_read_unlock();
444
445 return active;
446 }
447
448
449 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
450 {
451 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
452
453 mod_timer(&ifibss->timer,
454 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
455
456 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
457
458 if (time_before(jiffies, ifibss->last_scan_completed +
459 IEEE80211_IBSS_MERGE_INTERVAL))
460 return;
461
462 if (ieee80211_sta_active_ibss(sdata))
463 return;
464
465 if (ifibss->fixed_channel)
466 return;
467
468 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
469 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
470
471 ieee80211_request_internal_scan(sdata, ifibss->ssid, ifibss->ssid_len);
472 }
473
474 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
475 {
476 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
477 struct ieee80211_local *local = sdata->local;
478 struct ieee80211_supported_band *sband;
479 u8 bssid[ETH_ALEN];
480 u16 capability;
481 int i;
482
483 if (ifibss->fixed_bssid) {
484 memcpy(bssid, ifibss->bssid, ETH_ALEN);
485 } else {
486 /* Generate random, not broadcast, locally administered BSSID. Mix in
487 * own MAC address to make sure that devices that do not have proper
488 * random number generator get different BSSID. */
489 get_random_bytes(bssid, ETH_ALEN);
490 for (i = 0; i < ETH_ALEN; i++)
491 bssid[i] ^= sdata->dev->dev_addr[i];
492 bssid[0] &= ~0x01;
493 bssid[0] |= 0x02;
494 }
495
496 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
497 sdata->dev->name, bssid);
498
499 sband = local->hw.wiphy->bands[ifibss->channel->band];
500
501 capability = WLAN_CAPABILITY_IBSS;
502
503 if (ifibss->privacy)
504 capability |= WLAN_CAPABILITY_PRIVACY;
505 else
506 sdata->drop_unencrypted = 0;
507
508 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
509 ifibss->channel, 3, /* first two are basic */
510 capability, 0);
511 }
512
513 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
514 {
515 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
516 struct ieee80211_local *local = sdata->local;
517 struct ieee80211_bss *bss;
518 struct ieee80211_channel *chan = NULL;
519 const u8 *bssid = NULL;
520 int active_ibss;
521 u16 capability;
522
523 active_ibss = ieee80211_sta_active_ibss(sdata);
524 #ifdef CONFIG_MAC80211_IBSS_DEBUG
525 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
526 sdata->dev->name, active_ibss);
527 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
528
529 if (active_ibss)
530 return;
531
532 capability = WLAN_CAPABILITY_IBSS;
533 if (ifibss->privacy)
534 capability |= WLAN_CAPABILITY_PRIVACY;
535 if (ifibss->fixed_bssid)
536 bssid = ifibss->bssid;
537 if (ifibss->fixed_channel)
538 chan = ifibss->channel;
539 if (!is_zero_ether_addr(ifibss->bssid))
540 bssid = ifibss->bssid;
541 bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan, bssid,
542 ifibss->ssid, ifibss->ssid_len,
543 WLAN_CAPABILITY_IBSS |
544 WLAN_CAPABILITY_PRIVACY,
545 capability);
546
547 if (bss) {
548 #ifdef CONFIG_MAC80211_IBSS_DEBUG
549 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
550 "%pM\n", bss->cbss.bssid, ifibss->bssid);
551 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
552
553 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
554 " based on configured SSID\n",
555 sdata->dev->name, bss->cbss.bssid);
556
557 ieee80211_sta_join_ibss(sdata, bss);
558 ieee80211_rx_bss_put(local, bss);
559 return;
560 }
561
562 #ifdef CONFIG_MAC80211_IBSS_DEBUG
563 printk(KERN_DEBUG " did not try to join ibss\n");
564 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
565
566 /* Selected IBSS not found in current scan results - try to scan */
567 if (ifibss->state == IEEE80211_IBSS_MLME_JOINED &&
568 !ieee80211_sta_active_ibss(sdata)) {
569 mod_timer(&ifibss->timer,
570 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
571 } else if (time_after(jiffies, ifibss->last_scan_completed +
572 IEEE80211_SCAN_INTERVAL)) {
573 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
574 "join\n", sdata->dev->name);
575
576 ieee80211_request_internal_scan(sdata, ifibss->ssid,
577 ifibss->ssid_len);
578 } else if (ifibss->state != IEEE80211_IBSS_MLME_JOINED) {
579 int interval = IEEE80211_SCAN_INTERVAL;
580
581 if (time_after(jiffies, ifibss->ibss_join_req +
582 IEEE80211_IBSS_JOIN_TIMEOUT)) {
583 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
584 ieee80211_sta_create_ibss(sdata);
585 return;
586 }
587 printk(KERN_DEBUG "%s: IBSS not allowed on"
588 " %d MHz\n", sdata->dev->name,
589 local->hw.conf.channel->center_freq);
590
591 /* No IBSS found - decrease scan interval and continue
592 * scanning. */
593 interval = IEEE80211_SCAN_INTERVAL_SLOW;
594 }
595
596 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
597 mod_timer(&ifibss->timer,
598 round_jiffies(jiffies + interval));
599 }
600 }
601
602 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
603 struct ieee80211_mgmt *mgmt,
604 size_t len)
605 {
606 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
607 struct ieee80211_local *local = sdata->local;
608 int tx_last_beacon;
609 struct sk_buff *skb;
610 struct ieee80211_mgmt *resp;
611 u8 *pos, *end;
612
613 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
614 len < 24 + 2 || !ifibss->presp)
615 return;
616
617 tx_last_beacon = drv_tx_last_beacon(local);
618
619 #ifdef CONFIG_MAC80211_IBSS_DEBUG
620 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
621 " (tx_last_beacon=%d)\n",
622 sdata->dev->name, mgmt->sa, mgmt->da,
623 mgmt->bssid, tx_last_beacon);
624 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
625
626 if (!tx_last_beacon)
627 return;
628
629 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
630 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
631 return;
632
633 end = ((u8 *) mgmt) + len;
634 pos = mgmt->u.probe_req.variable;
635 if (pos[0] != WLAN_EID_SSID ||
636 pos + 2 + pos[1] > end) {
637 #ifdef CONFIG_MAC80211_IBSS_DEBUG
638 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
639 "from %pM\n",
640 sdata->dev->name, mgmt->sa);
641 #endif
642 return;
643 }
644 if (pos[1] != 0 &&
645 (pos[1] != ifibss->ssid_len ||
646 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
647 /* Ignore ProbeReq for foreign SSID */
648 return;
649 }
650
651 /* Reply with ProbeResp */
652 skb = skb_copy(ifibss->presp, GFP_KERNEL);
653 if (!skb)
654 return;
655
656 resp = (struct ieee80211_mgmt *) skb->data;
657 memcpy(resp->da, mgmt->sa, ETH_ALEN);
658 #ifdef CONFIG_MAC80211_IBSS_DEBUG
659 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
660 sdata->dev->name, resp->da);
661 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
662 ieee80211_tx_skb(sdata, skb, 0);
663 }
664
665 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
666 struct ieee80211_mgmt *mgmt,
667 size_t len,
668 struct ieee80211_rx_status *rx_status)
669 {
670 size_t baselen;
671 struct ieee802_11_elems elems;
672
673 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
674 return; /* ignore ProbeResp to foreign address */
675
676 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
677 if (baselen > len)
678 return;
679
680 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
681 &elems);
682
683 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
684 }
685
686 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
687 struct ieee80211_mgmt *mgmt,
688 size_t len,
689 struct ieee80211_rx_status *rx_status)
690 {
691 size_t baselen;
692 struct ieee802_11_elems elems;
693
694 /* Process beacon from the current BSS */
695 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
696 if (baselen > len)
697 return;
698
699 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
700
701 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
702 }
703
704 static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
705 struct sk_buff *skb)
706 {
707 struct ieee80211_rx_status *rx_status;
708 struct ieee80211_mgmt *mgmt;
709 u16 fc;
710
711 rx_status = IEEE80211_SKB_RXCB(skb);
712 mgmt = (struct ieee80211_mgmt *) skb->data;
713 fc = le16_to_cpu(mgmt->frame_control);
714
715 switch (fc & IEEE80211_FCTL_STYPE) {
716 case IEEE80211_STYPE_PROBE_REQ:
717 ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len);
718 break;
719 case IEEE80211_STYPE_PROBE_RESP:
720 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
721 rx_status);
722 break;
723 case IEEE80211_STYPE_BEACON:
724 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
725 rx_status);
726 break;
727 case IEEE80211_STYPE_AUTH:
728 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
729 break;
730 }
731
732 kfree_skb(skb);
733 }
734
735 static void ieee80211_ibss_work(struct work_struct *work)
736 {
737 struct ieee80211_sub_if_data *sdata =
738 container_of(work, struct ieee80211_sub_if_data, u.ibss.work);
739 struct ieee80211_local *local = sdata->local;
740 struct ieee80211_if_ibss *ifibss;
741 struct sk_buff *skb;
742
743 if (WARN_ON(local->suspended))
744 return;
745
746 if (!netif_running(sdata->dev))
747 return;
748
749 if (local->scanning)
750 return;
751
752 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC))
753 return;
754 ifibss = &sdata->u.ibss;
755
756 while ((skb = skb_dequeue(&ifibss->skb_queue)))
757 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
758
759 if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request))
760 return;
761
762 switch (ifibss->state) {
763 case IEEE80211_IBSS_MLME_SEARCH:
764 ieee80211_sta_find_ibss(sdata);
765 break;
766 case IEEE80211_IBSS_MLME_JOINED:
767 ieee80211_sta_merge_ibss(sdata);
768 break;
769 default:
770 WARN_ON(1);
771 break;
772 }
773 }
774
775 static void ieee80211_ibss_timer(unsigned long data)
776 {
777 struct ieee80211_sub_if_data *sdata =
778 (struct ieee80211_sub_if_data *) data;
779 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
780 struct ieee80211_local *local = sdata->local;
781
782 if (local->quiescing) {
783 ifibss->timer_running = true;
784 return;
785 }
786
787 set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request);
788 ieee80211_queue_work(&local->hw, &ifibss->work);
789 }
790
791 #ifdef CONFIG_PM
792 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
793 {
794 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
795
796 cancel_work_sync(&ifibss->work);
797 if (del_timer_sync(&ifibss->timer))
798 ifibss->timer_running = true;
799 }
800
801 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
802 {
803 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
804
805 if (ifibss->timer_running) {
806 add_timer(&ifibss->timer);
807 ifibss->timer_running = false;
808 }
809 }
810 #endif
811
812 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
813 {
814 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
815
816 INIT_WORK(&ifibss->work, ieee80211_ibss_work);
817 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
818 (unsigned long) sdata);
819 skb_queue_head_init(&ifibss->skb_queue);
820 }
821
822 /* scan finished notification */
823 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
824 {
825 struct ieee80211_sub_if_data *sdata;
826
827 mutex_lock(&local->iflist_mtx);
828 list_for_each_entry(sdata, &local->interfaces, list) {
829 if (!netif_running(sdata->dev))
830 continue;
831 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
832 continue;
833 if (!sdata->u.ibss.ssid_len)
834 continue;
835 sdata->u.ibss.last_scan_completed = jiffies;
836 mod_timer(&sdata->u.ibss.timer, 0);
837 }
838 mutex_unlock(&local->iflist_mtx);
839 }
840
841 ieee80211_rx_result
842 ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
843 {
844 struct ieee80211_local *local = sdata->local;
845 struct ieee80211_mgmt *mgmt;
846 u16 fc;
847
848 if (skb->len < 24)
849 return RX_DROP_MONITOR;
850
851 mgmt = (struct ieee80211_mgmt *) skb->data;
852 fc = le16_to_cpu(mgmt->frame_control);
853
854 switch (fc & IEEE80211_FCTL_STYPE) {
855 case IEEE80211_STYPE_PROBE_RESP:
856 case IEEE80211_STYPE_BEACON:
857 case IEEE80211_STYPE_PROBE_REQ:
858 case IEEE80211_STYPE_AUTH:
859 skb_queue_tail(&sdata->u.ibss.skb_queue, skb);
860 ieee80211_queue_work(&local->hw, &sdata->u.ibss.work);
861 return RX_QUEUED;
862 }
863
864 return RX_DROP_MONITOR;
865 }
866
867 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
868 struct cfg80211_ibss_params *params)
869 {
870 struct sk_buff *skb;
871
872 if (params->bssid) {
873 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
874 sdata->u.ibss.fixed_bssid = true;
875 } else
876 sdata->u.ibss.fixed_bssid = false;
877
878 sdata->u.ibss.privacy = params->privacy;
879
880 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
881
882 sdata->u.ibss.channel = params->channel;
883 sdata->u.ibss.fixed_channel = params->channel_fixed;
884
885 if (params->ie) {
886 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
887 GFP_KERNEL);
888 if (sdata->u.ibss.ie)
889 sdata->u.ibss.ie_len = params->ie_len;
890 }
891
892 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
893 36 /* bitrates */ +
894 34 /* SSID */ +
895 3 /* DS params */ +
896 4 /* IBSS params */ +
897 params->ie_len);
898 if (!skb)
899 return -ENOMEM;
900
901 sdata->u.ibss.skb = skb;
902 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
903 sdata->u.ibss.ibss_join_req = jiffies;
904
905 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
906
907 /*
908 * The ssid_len setting below is used to see whether
909 * we are active, and we need all other settings
910 * before that may get visible.
911 */
912 mb();
913
914 sdata->u.ibss.ssid_len = params->ssid_len;
915
916 ieee80211_recalc_idle(sdata->local);
917
918 set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
919 ieee80211_queue_work(&sdata->local->hw, &sdata->u.ibss.work);
920
921 return 0;
922 }
923
924 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
925 {
926 struct sk_buff *skb;
927
928 del_timer_sync(&sdata->u.ibss.timer);
929 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
930 cancel_work_sync(&sdata->u.ibss.work);
931 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
932
933 sta_info_flush(sdata->local, sdata);
934
935 /* remove beacon */
936 kfree(sdata->u.ibss.ie);
937 skb = sdata->u.ibss.presp;
938 rcu_assign_pointer(sdata->u.ibss.presp, NULL);
939 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
940 synchronize_rcu();
941 kfree_skb(skb);
942
943 skb_queue_purge(&sdata->u.ibss.skb_queue);
944 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
945 sdata->u.ibss.ssid_len = 0;
946
947 ieee80211_recalc_idle(sdata->local);
948
949 return 0;
950 }
Linux ARM platform port for MOXA ART SoC