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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / net / mac80211 / ibss.c
blob5a3d704fa43321ebe7d547dc8d25d6d95e37d998
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 lockdep_assert_held(&sdata->u.ibss.mtx);
47
48 if (len < 24 + 6)
49 return;
50
51 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
52 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
53 status_code = le16_to_cpu(mgmt->u.auth.status_code);
54
55 /*
56 * IEEE 802.11 standard does not require authentication in IBSS
57 * networks and most implementations do not seem to use it.
58 * However, try to reply to authentication attempts if someone
59 * has actually implemented this.
60 */
61 if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1)
62 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
63 sdata->u.ibss.bssid, NULL, 0, 0);
64 }
65
66 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
67 const u8 *bssid, const int beacon_int,
68 struct ieee80211_channel *chan,
69 const u32 basic_rates,
70 const u16 capability, u64 tsf)
71 {
72 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
73 struct ieee80211_local *local = sdata->local;
74 int rates, i;
75 struct sk_buff *skb;
76 struct ieee80211_mgmt *mgmt;
77 u8 *pos;
78 struct ieee80211_supported_band *sband;
79 struct cfg80211_bss *bss;
80 u32 bss_change;
81 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
82
83 lockdep_assert_held(&ifibss->mtx);
84
85 /* Reset own TSF to allow time synchronization work. */
86 drv_reset_tsf(local);
87
88 skb = ifibss->skb;
89 rcu_assign_pointer(ifibss->presp, NULL);
90 synchronize_rcu();
91 skb->data = skb->head;
92 skb->len = 0;
93 skb_reset_tail_pointer(skb);
94 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
95
96 if (memcmp(ifibss->bssid, bssid, ETH_ALEN))
97 sta_info_flush(sdata->local, sdata);
98
99 /* if merging, indicate to driver that we leave the old IBSS */
100 if (sdata->vif.bss_conf.ibss_joined) {
101 sdata->vif.bss_conf.ibss_joined = false;
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 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
111 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
112
113 sband = local->hw.wiphy->bands[chan->band];
114
115 /* build supported rates array */
116 pos = supp_rates;
117 for (i = 0; i < sband->n_bitrates; i++) {
118 int rate = sband->bitrates[i].bitrate;
119 u8 basic = 0;
120 if (basic_rates & BIT(i))
121 basic = 0x80;
122 *pos++ = basic | (u8) (rate / 5);
123 }
124
125 /* Build IBSS probe response */
126 mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
127 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
128 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
129 IEEE80211_STYPE_PROBE_RESP);
130 memset(mgmt->da, 0xff, ETH_ALEN);
131 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
132 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
133 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
134 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
135 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
136
137 pos = skb_put(skb, 2 + ifibss->ssid_len);
138 *pos++ = WLAN_EID_SSID;
139 *pos++ = ifibss->ssid_len;
140 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
141
142 rates = sband->n_bitrates;
143 if (rates > 8)
144 rates = 8;
145 pos = skb_put(skb, 2 + rates);
146 *pos++ = WLAN_EID_SUPP_RATES;
147 *pos++ = rates;
148 memcpy(pos, supp_rates, rates);
149
150 if (sband->band == IEEE80211_BAND_2GHZ) {
151 pos = skb_put(skb, 2 + 1);
152 *pos++ = WLAN_EID_DS_PARAMS;
153 *pos++ = 1;
154 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
155 }
156
157 pos = skb_put(skb, 2 + 2);
158 *pos++ = WLAN_EID_IBSS_PARAMS;
159 *pos++ = 2;
160 /* FIX: set ATIM window based on scan results */
161 *pos++ = 0;
162 *pos++ = 0;
163
164 if (sband->n_bitrates > 8) {
165 rates = sband->n_bitrates - 8;
166 pos = skb_put(skb, 2 + rates);
167 *pos++ = WLAN_EID_EXT_SUPP_RATES;
168 *pos++ = rates;
169 memcpy(pos, &supp_rates[8], rates);
170 }
171
172 if (ifibss->ie_len)
173 memcpy(skb_put(skb, ifibss->ie_len),
174 ifibss->ie, ifibss->ie_len);
175
176 rcu_assign_pointer(ifibss->presp, skb);
177
178 sdata->vif.bss_conf.beacon_int = beacon_int;
179 sdata->vif.bss_conf.basic_rates = basic_rates;
180 bss_change = BSS_CHANGED_BEACON_INT;
181 bss_change |= ieee80211_reset_erp_info(sdata);
182 bss_change |= BSS_CHANGED_BSSID;
183 bss_change |= BSS_CHANGED_BEACON;
184 bss_change |= BSS_CHANGED_BEACON_ENABLED;
185 bss_change |= BSS_CHANGED_BASIC_RATES;
186 bss_change |= BSS_CHANGED_IBSS;
187 sdata->vif.bss_conf.ibss_joined = true;
188 ieee80211_bss_info_change_notify(sdata, bss_change);
189
190 ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
191
192 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
193 mod_timer(&ifibss->timer,
194 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
195
196 bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
197 mgmt, skb->len, 0, GFP_KERNEL);
198 cfg80211_put_bss(bss);
199 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
200 }
201
202 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
203 struct ieee80211_bss *bss)
204 {
205 struct cfg80211_bss *cbss =
206 container_of((void *)bss, struct cfg80211_bss, priv);
207 struct ieee80211_supported_band *sband;
208 u32 basic_rates;
209 int i, j;
210 u16 beacon_int = cbss->beacon_interval;
211
212 lockdep_assert_held(&sdata->u.ibss.mtx);
213
214 if (beacon_int < 10)
215 beacon_int = 10;
216
217 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
218
219 basic_rates = 0;
220
221 for (i = 0; i < bss->supp_rates_len; i++) {
222 int rate = (bss->supp_rates[i] & 0x7f) * 5;
223 bool is_basic = !!(bss->supp_rates[i] & 0x80);
224
225 for (j = 0; j < sband->n_bitrates; j++) {
226 if (sband->bitrates[j].bitrate == rate) {
227 if (is_basic)
228 basic_rates |= BIT(j);
229 break;
230 }
231 }
232 }
233
234 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
235 beacon_int,
236 cbss->channel,
237 basic_rates,
238 cbss->capability,
239 cbss->tsf);
240 }
241
242 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
243 struct ieee80211_mgmt *mgmt,
244 size_t len,
245 struct ieee80211_rx_status *rx_status,
246 struct ieee802_11_elems *elems,
247 bool beacon)
248 {
249 struct ieee80211_local *local = sdata->local;
250 int freq;
251 struct cfg80211_bss *cbss;
252 struct ieee80211_bss *bss;
253 struct sta_info *sta;
254 struct ieee80211_channel *channel;
255 u64 beacon_timestamp, rx_timestamp;
256 u32 supp_rates = 0;
257 enum ieee80211_band band = rx_status->band;
258
259 if (elems->ds_params && elems->ds_params_len == 1)
260 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
261 else
262 freq = rx_status->freq;
263
264 channel = ieee80211_get_channel(local->hw.wiphy, freq);
265
266 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
267 return;
268
269 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
270 memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) {
271 supp_rates = ieee80211_sta_get_rates(local, elems, band);
272
273 rcu_read_lock();
274
275 sta = sta_info_get(sdata, mgmt->sa);
276 if (sta) {
277 u32 prev_rates;
278
279 prev_rates = sta->sta.supp_rates[band];
280 /* make sure mandatory rates are always added */
281 sta->sta.supp_rates[band] = supp_rates |
282 ieee80211_mandatory_rates(local, band);
283
284 if (sta->sta.supp_rates[band] != prev_rates) {
285 #ifdef CONFIG_MAC80211_IBSS_DEBUG
286 printk(KERN_DEBUG "%s: updated supp_rates set "
287 "for %pM based on beacon/probe_response "
288 "(0x%x -> 0x%x)\n",
289 sdata->name, sta->sta.addr,
290 prev_rates, sta->sta.supp_rates[band]);
291 #endif
292 rate_control_rate_init(sta);
293 }
294 rcu_read_unlock();
295 } else {
296 rcu_read_unlock();
297 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
298 supp_rates, GFP_KERNEL);
299 }
300 }
301
302 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
303 channel, beacon);
304 if (!bss)
305 return;
306
307 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
308
309 /* was just updated in ieee80211_bss_info_update */
310 beacon_timestamp = cbss->tsf;
311
312 /* check if we need to merge IBSS */
313
314 /* we use a fixed BSSID */
315 if (sdata->u.ibss.fixed_bssid)
316 goto put_bss;
317
318 /* not an IBSS */
319 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
320 goto put_bss;
321
322 /* different channel */
323 if (cbss->channel != local->oper_channel)
324 goto put_bss;
325
326 /* different SSID */
327 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
328 memcmp(elems->ssid, sdata->u.ibss.ssid,
329 sdata->u.ibss.ssid_len))
330 goto put_bss;
331
332 /* same BSSID */
333 if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0)
334 goto put_bss;
335
336 if (rx_status->flag & RX_FLAG_TSFT) {
337 /*
338 * For correct IBSS merging we need mactime; since mactime is
339 * defined as the time the first data symbol of the frame hits
340 * the PHY, and the timestamp of the beacon is defined as "the
341 * time that the data symbol containing the first bit of the
342 * timestamp is transmitted to the PHY plus the transmitting
343 * STA's delays through its local PHY from the MAC-PHY
344 * interface to its interface with the WM" (802.11 11.1.2)
345 * - equals the time this bit arrives at the receiver - we have
346 * to take into account the offset between the two.
347 *
348 * E.g. at 1 MBit that means mactime is 192 usec earlier
349 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
350 */
351 int rate;
352
353 if (rx_status->flag & RX_FLAG_HT)
354 rate = 65; /* TODO: HT rates */
355 else
356 rate = local->hw.wiphy->bands[band]->
357 bitrates[rx_status->rate_idx].bitrate;
358
359 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
360 } else {
361 /*
362 * second best option: get current TSF
363 * (will return -1 if not supported)
364 */
365 rx_timestamp = drv_get_tsf(local);
366 }
367
368 #ifdef CONFIG_MAC80211_IBSS_DEBUG
369 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
370 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
371 mgmt->sa, mgmt->bssid,
372 (unsigned long long)rx_timestamp,
373 (unsigned long long)beacon_timestamp,
374 (unsigned long long)(rx_timestamp - beacon_timestamp),
375 jiffies);
376 #endif
377
378 /* give slow hardware some time to do the TSF sync */
379 if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY)
380 goto put_bss;
381
382 if (beacon_timestamp > rx_timestamp) {
383 #ifdef CONFIG_MAC80211_IBSS_DEBUG
384 printk(KERN_DEBUG "%s: beacon TSF higher than "
385 "local TSF - IBSS merge with BSSID %pM\n",
386 sdata->name, mgmt->bssid);
387 #endif
388 ieee80211_sta_join_ibss(sdata, bss);
389 supp_rates = ieee80211_sta_get_rates(local, elems, band);
390 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
391 supp_rates, GFP_KERNEL);
392 }
393
394 put_bss:
395 ieee80211_rx_bss_put(local, bss);
396 }
397
398 /*
399 * Add a new IBSS station, will also be called by the RX code when,
400 * in IBSS mode, receiving a frame from a yet-unknown station, hence
401 * must be callable in atomic context.
402 */
403 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
404 u8 *bssid,u8 *addr, u32 supp_rates,
405 gfp_t gfp)
406 {
407 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
408 struct ieee80211_local *local = sdata->local;
409 struct sta_info *sta;
410 int band = local->hw.conf.channel->band;
411
412 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
413 if (net_ratelimit())
414 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
415 sdata->name, addr);
416 return NULL;
417 }
418
419 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
420 return NULL;
421
422 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
423 return NULL;
424
425 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
426 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
427 wiphy_name(local->hw.wiphy), addr, sdata->name);
428 #endif
429
430 sta = sta_info_alloc(sdata, addr, gfp);
431 if (!sta)
432 return NULL;
433
434 sta->last_rx = jiffies;
435 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
436
437 /* make sure mandatory rates are always added */
438 sta->sta.supp_rates[band] = supp_rates |
439 ieee80211_mandatory_rates(local, band);
440
441 rate_control_rate_init(sta);
442
443 /* If it fails, maybe we raced another insertion? */
444 if (sta_info_insert(sta))
445 return sta_info_get(sdata, addr);
446 return sta;
447 }
448
449 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
450 {
451 struct ieee80211_local *local = sdata->local;
452 int active = 0;
453 struct sta_info *sta;
454
455 lockdep_assert_held(&sdata->u.ibss.mtx);
456
457 rcu_read_lock();
458
459 list_for_each_entry_rcu(sta, &local->sta_list, list) {
460 if (sta->sdata == sdata &&
461 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
462 jiffies)) {
463 active++;
464 break;
465 }
466 }
467
468 rcu_read_unlock();
469
470 return active;
471 }
472
473 /*
474 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
475 */
476
477 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
478 {
479 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
480
481 lockdep_assert_held(&ifibss->mtx);
482
483 mod_timer(&ifibss->timer,
484 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
485
486 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
487
488 if (time_before(jiffies, ifibss->last_scan_completed +
489 IEEE80211_IBSS_MERGE_INTERVAL))
490 return;
491
492 if (ieee80211_sta_active_ibss(sdata))
493 return;
494
495 if (ifibss->fixed_channel)
496 return;
497
498 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
499 "IBSS networks with same SSID (merge)\n", sdata->name);
500
501 ieee80211_request_internal_scan(sdata,
502 ifibss->ssid, ifibss->ssid_len,
503 ifibss->fixed_channel ? ifibss->channel : NULL);
504 }
505
506 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
507 {
508 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
509 struct ieee80211_local *local = sdata->local;
510 struct ieee80211_supported_band *sband;
511 u8 bssid[ETH_ALEN];
512 u16 capability;
513 int i;
514
515 lockdep_assert_held(&ifibss->mtx);
516
517 if (ifibss->fixed_bssid) {
518 memcpy(bssid, ifibss->bssid, ETH_ALEN);
519 } else {
520 /* Generate random, not broadcast, locally administered BSSID. Mix in
521 * own MAC address to make sure that devices that do not have proper
522 * random number generator get different BSSID. */
523 get_random_bytes(bssid, ETH_ALEN);
524 for (i = 0; i < ETH_ALEN; i++)
525 bssid[i] ^= sdata->vif.addr[i];
526 bssid[0] &= ~0x01;
527 bssid[0] |= 0x02;
528 }
529
530 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
531 sdata->name, bssid);
532
533 sband = local->hw.wiphy->bands[ifibss->channel->band];
534
535 capability = WLAN_CAPABILITY_IBSS;
536
537 if (ifibss->privacy)
538 capability |= WLAN_CAPABILITY_PRIVACY;
539 else
540 sdata->drop_unencrypted = 0;
541
542 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
543 ifibss->channel, ifibss->basic_rates,
544 capability, 0);
545 }
546
547 /*
548 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
549 */
550
551 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
552 {
553 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
554 struct ieee80211_local *local = sdata->local;
555 struct cfg80211_bss *cbss;
556 struct ieee80211_channel *chan = NULL;
557 const u8 *bssid = NULL;
558 int active_ibss;
559 u16 capability;
560
561 lockdep_assert_held(&ifibss->mtx);
562
563 active_ibss = ieee80211_sta_active_ibss(sdata);
564 #ifdef CONFIG_MAC80211_IBSS_DEBUG
565 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
566 sdata->name, active_ibss);
567 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
568
569 if (active_ibss)
570 return;
571
572 capability = WLAN_CAPABILITY_IBSS;
573 if (ifibss->privacy)
574 capability |= WLAN_CAPABILITY_PRIVACY;
575 if (ifibss->fixed_bssid)
576 bssid = ifibss->bssid;
577 if (ifibss->fixed_channel)
578 chan = ifibss->channel;
579 if (!is_zero_ether_addr(ifibss->bssid))
580 bssid = ifibss->bssid;
581 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
582 ifibss->ssid, ifibss->ssid_len,
583 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
584 capability);
585
586 if (cbss) {
587 struct ieee80211_bss *bss;
588
589 bss = (void *)cbss->priv;
590 #ifdef CONFIG_MAC80211_IBSS_DEBUG
591 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
592 "%pM\n", cbss->bssid, ifibss->bssid);
593 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
594
595 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
596 " based on configured SSID\n",
597 sdata->name, cbss->bssid);
598
599 ieee80211_sta_join_ibss(sdata, bss);
600 ieee80211_rx_bss_put(local, bss);
601 return;
602 }
603
604 #ifdef CONFIG_MAC80211_IBSS_DEBUG
605 printk(KERN_DEBUG " did not try to join ibss\n");
606 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
607
608 /* Selected IBSS not found in current scan results - try to scan */
609 if (time_after(jiffies, ifibss->last_scan_completed +
610 IEEE80211_SCAN_INTERVAL)) {
611 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
612 "join\n", sdata->name);
613
614 ieee80211_request_internal_scan(sdata,
615 ifibss->ssid, ifibss->ssid_len,
616 ifibss->fixed_channel ? ifibss->channel : NULL);
617 } else {
618 int interval = IEEE80211_SCAN_INTERVAL;
619
620 if (time_after(jiffies, ifibss->ibss_join_req +
621 IEEE80211_IBSS_JOIN_TIMEOUT)) {
622 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
623 ieee80211_sta_create_ibss(sdata);
624 return;
625 }
626 printk(KERN_DEBUG "%s: IBSS not allowed on"
627 " %d MHz\n", sdata->name,
628 local->hw.conf.channel->center_freq);
629
630 /* No IBSS found - decrease scan interval and continue
631 * scanning. */
632 interval = IEEE80211_SCAN_INTERVAL_SLOW;
633 }
634
635 mod_timer(&ifibss->timer,
636 round_jiffies(jiffies + interval));
637 }
638 }
639
640 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
641 struct ieee80211_mgmt *mgmt,
642 size_t len)
643 {
644 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
645 struct ieee80211_local *local = sdata->local;
646 int tx_last_beacon;
647 struct sk_buff *skb;
648 struct ieee80211_mgmt *resp;
649 u8 *pos, *end;
650
651 lockdep_assert_held(&ifibss->mtx);
652
653 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
654 len < 24 + 2 || !ifibss->presp)
655 return;
656
657 tx_last_beacon = drv_tx_last_beacon(local);
658
659 #ifdef CONFIG_MAC80211_IBSS_DEBUG
660 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
661 " (tx_last_beacon=%d)\n",
662 sdata->name, mgmt->sa, mgmt->da,
663 mgmt->bssid, tx_last_beacon);
664 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
665
666 if (!tx_last_beacon)
667 return;
668
669 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
670 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
671 return;
672
673 end = ((u8 *) mgmt) + len;
674 pos = mgmt->u.probe_req.variable;
675 if (pos[0] != WLAN_EID_SSID ||
676 pos + 2 + pos[1] > end) {
677 #ifdef CONFIG_MAC80211_IBSS_DEBUG
678 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
679 "from %pM\n",
680 sdata->name, mgmt->sa);
681 #endif
682 return;
683 }
684 if (pos[1] != 0 &&
685 (pos[1] != ifibss->ssid_len ||
686 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
687 /* Ignore ProbeReq for foreign SSID */
688 return;
689 }
690
691 /* Reply with ProbeResp */
692 skb = skb_copy(ifibss->presp, GFP_KERNEL);
693 if (!skb)
694 return;
695
696 resp = (struct ieee80211_mgmt *) skb->data;
697 memcpy(resp->da, mgmt->sa, ETH_ALEN);
698 #ifdef CONFIG_MAC80211_IBSS_DEBUG
699 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
700 sdata->name, resp->da);
701 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
702 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
703 ieee80211_tx_skb(sdata, skb);
704 }
705
706 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
707 struct ieee80211_mgmt *mgmt,
708 size_t len,
709 struct ieee80211_rx_status *rx_status)
710 {
711 size_t baselen;
712 struct ieee802_11_elems elems;
713
714 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
715 return; /* ignore ProbeResp to foreign address */
716
717 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
718 if (baselen > len)
719 return;
720
721 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
722 &elems);
723
724 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
725 }
726
727 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
728 struct ieee80211_mgmt *mgmt,
729 size_t len,
730 struct ieee80211_rx_status *rx_status)
731 {
732 size_t baselen;
733 struct ieee802_11_elems elems;
734
735 /* Process beacon from the current BSS */
736 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
737 if (baselen > len)
738 return;
739
740 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
741
742 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
743 }
744
745 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
746 struct sk_buff *skb)
747 {
748 struct ieee80211_rx_status *rx_status;
749 struct ieee80211_mgmt *mgmt;
750 u16 fc;
751
752 rx_status = IEEE80211_SKB_RXCB(skb);
753 mgmt = (struct ieee80211_mgmt *) skb->data;
754 fc = le16_to_cpu(mgmt->frame_control);
755
756 mutex_lock(&sdata->u.ibss.mtx);
757
758 switch (fc & IEEE80211_FCTL_STYPE) {
759 case IEEE80211_STYPE_PROBE_REQ:
760 ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len);
761 break;
762 case IEEE80211_STYPE_PROBE_RESP:
763 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
764 rx_status);
765 break;
766 case IEEE80211_STYPE_BEACON:
767 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
768 rx_status);
769 break;
770 case IEEE80211_STYPE_AUTH:
771 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
772 break;
773 }
774
775 mutex_unlock(&sdata->u.ibss.mtx);
776 }
777
778 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
779 {
780 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
781
782 mutex_lock(&ifibss->mtx);
783
784 /*
785 * Work could be scheduled after scan or similar
786 * when we aren't even joined (or trying) with a
787 * network.
788 */
789 if (!ifibss->ssid_len)
790 goto out;
791
792 switch (ifibss->state) {
793 case IEEE80211_IBSS_MLME_SEARCH:
794 ieee80211_sta_find_ibss(sdata);
795 break;
796 case IEEE80211_IBSS_MLME_JOINED:
797 ieee80211_sta_merge_ibss(sdata);
798 break;
799 default:
800 WARN_ON(1);
801 break;
802 }
803
804 out:
805 mutex_unlock(&ifibss->mtx);
806 }
807
808 static void ieee80211_ibss_timer(unsigned long data)
809 {
810 struct ieee80211_sub_if_data *sdata =
811 (struct ieee80211_sub_if_data *) data;
812 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
813 struct ieee80211_local *local = sdata->local;
814
815 if (local->quiescing) {
816 ifibss->timer_running = true;
817 return;
818 }
819
820 ieee80211_queue_work(&local->hw, &sdata->work);
821 }
822
823 #ifdef CONFIG_PM
824 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
825 {
826 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
827
828 if (del_timer_sync(&ifibss->timer))
829 ifibss->timer_running = true;
830 }
831
832 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
833 {
834 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
835
836 if (ifibss->timer_running) {
837 add_timer(&ifibss->timer);
838 ifibss->timer_running = false;
839 }
840 }
841 #endif
842
843 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
844 {
845 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
846
847 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
848 (unsigned long) sdata);
849 mutex_init(&ifibss->mtx);
850 }
851
852 /* scan finished notification */
853 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
854 {
855 struct ieee80211_sub_if_data *sdata;
856
857 mutex_lock(&local->iflist_mtx);
858 list_for_each_entry(sdata, &local->interfaces, list) {
859 if (!ieee80211_sdata_running(sdata))
860 continue;
861 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
862 continue;
863 sdata->u.ibss.last_scan_completed = jiffies;
864 ieee80211_queue_work(&local->hw, &sdata->work);
865 }
866 mutex_unlock(&local->iflist_mtx);
867 }
868
869 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
870 struct cfg80211_ibss_params *params)
871 {
872 struct sk_buff *skb;
873
874 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
875 36 /* bitrates */ +
876 34 /* SSID */ +
877 3 /* DS params */ +
878 4 /* IBSS params */ +
879 params->ie_len);
880 if (!skb)
881 return -ENOMEM;
882
883 mutex_lock(&sdata->u.ibss.mtx);
884
885 if (params->bssid) {
886 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
887 sdata->u.ibss.fixed_bssid = true;
888 } else
889 sdata->u.ibss.fixed_bssid = false;
890
891 sdata->u.ibss.privacy = params->privacy;
892 sdata->u.ibss.basic_rates = params->basic_rates;
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 /* fix ourselves to that channel now already */
900 if (params->channel_fixed) {
901 sdata->local->oper_channel = params->channel;
902 WARN_ON(!ieee80211_set_channel_type(sdata->local, sdata,
903 NL80211_CHAN_NO_HT));
904 }
905
906 if (params->ie) {
907 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
908 GFP_KERNEL);
909 if (sdata->u.ibss.ie)
910 sdata->u.ibss.ie_len = params->ie_len;
911 }
912
913 sdata->u.ibss.skb = skb;
914 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
915 sdata->u.ibss.ibss_join_req = jiffies;
916
917 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
918 sdata->u.ibss.ssid_len = params->ssid_len;
919
920 ieee80211_recalc_idle(sdata->local);
921
922 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
923
924 mutex_unlock(&sdata->u.ibss.mtx);
925
926 return 0;
927 }
928
929 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
930 {
931 struct sk_buff *skb;
932 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
933 struct ieee80211_local *local = sdata->local;
934 struct cfg80211_bss *cbss;
935 u16 capability;
936 int active_ibss;
937
938 mutex_lock(&sdata->u.ibss.mtx);
939
940 active_ibss = ieee80211_sta_active_ibss(sdata);
941
942 if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
943 capability = WLAN_CAPABILITY_IBSS;
944
945 if (ifibss->privacy)
946 capability |= WLAN_CAPABILITY_PRIVACY;
947
948 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
949 ifibss->bssid, ifibss->ssid,
950 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
951 WLAN_CAPABILITY_PRIVACY,
952 capability);
953
954 if (cbss) {
955 cfg80211_unlink_bss(local->hw.wiphy, cbss);
956 cfg80211_put_bss(cbss);
957 }
958 }
959
960 sta_info_flush(sdata->local, sdata);
961
962 /* remove beacon */
963 kfree(sdata->u.ibss.ie);
964 skb = sdata->u.ibss.presp;
965 rcu_assign_pointer(sdata->u.ibss.presp, NULL);
966 sdata->vif.bss_conf.ibss_joined = false;
967 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
968 BSS_CHANGED_IBSS);
969 synchronize_rcu();
970 kfree_skb(skb);
971
972 skb_queue_purge(&sdata->skb_queue);
973 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
974 sdata->u.ibss.ssid_len = 0;
975
976 del_timer_sync(&sdata->u.ibss.timer);
977
978 mutex_unlock(&sdata->u.ibss.mtx);
979
980 ieee80211_recalc_idle(sdata->local);
981
982 return 0;
983 }
Tomato firmware and modifications.