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mac80211: add driver ops wrappers
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / ibss.c
bloba8e23232267e996f74d6c1387ea324109231d1a4
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, 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 size_t supp_rates_len,
67 const u8 *supp_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, j;
73 struct sk_buff *skb;
74 struct ieee80211_mgmt *mgmt;
75 u8 *pos;
76 struct ieee80211_supported_band *sband;
77 u32 bss_change;
78
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 IBSS probe response */
105 mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
106 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
107 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
108 IEEE80211_STYPE_PROBE_RESP);
109 memset(mgmt->da, 0xff, ETH_ALEN);
110 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
111 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
112 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
113 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
114 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
115
116 pos = skb_put(skb, 2 + ifibss->ssid_len);
117 *pos++ = WLAN_EID_SSID;
118 *pos++ = ifibss->ssid_len;
119 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
120
121 rates = supp_rates_len;
122 if (rates > 8)
123 rates = 8;
124 pos = skb_put(skb, 2 + rates);
125 *pos++ = WLAN_EID_SUPP_RATES;
126 *pos++ = rates;
127 memcpy(pos, supp_rates, rates);
128
129 if (sband->band == IEEE80211_BAND_2GHZ) {
130 pos = skb_put(skb, 2 + 1);
131 *pos++ = WLAN_EID_DS_PARAMS;
132 *pos++ = 1;
133 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
134 }
135
136 pos = skb_put(skb, 2 + 2);
137 *pos++ = WLAN_EID_IBSS_PARAMS;
138 *pos++ = 2;
139 /* FIX: set ATIM window based on scan results */
140 *pos++ = 0;
141 *pos++ = 0;
142
143 if (supp_rates_len > 8) {
144 rates = supp_rates_len - 8;
145 pos = skb_put(skb, 2 + rates);
146 *pos++ = WLAN_EID_EXT_SUPP_RATES;
147 *pos++ = rates;
148 memcpy(pos, &supp_rates[8], rates);
149 }
150
151 if (ifibss->ie_len)
152 memcpy(skb_put(skb, ifibss->ie_len),
153 ifibss->ie, ifibss->ie_len);
154
155 rcu_assign_pointer(ifibss->presp, skb);
156
157 sdata->vif.bss_conf.beacon_int = beacon_int;
158 bss_change = BSS_CHANGED_BEACON_INT;
159 bss_change |= ieee80211_reset_erp_info(sdata);
160 bss_change |= BSS_CHANGED_BSSID;
161 bss_change |= BSS_CHANGED_BEACON;
162 bss_change |= BSS_CHANGED_BEACON_ENABLED;
163 ieee80211_bss_info_change_notify(sdata, bss_change);
164
165 rates = 0;
166 for (i = 0; i < supp_rates_len; i++) {
167 int bitrate = (supp_rates[i] & 0x7f) * 5;
168 for (j = 0; j < sband->n_bitrates; j++)
169 if (sband->bitrates[j].bitrate == bitrate)
170 rates |= BIT(j);
171 }
172
173 ieee80211_sta_def_wmm_params(sdata, supp_rates_len, supp_rates);
174
175 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
176 mod_timer(&ifibss->timer,
177 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
178
179 cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
180 mgmt, skb->len, 0, GFP_KERNEL);
181 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
182 }
183
184 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
185 struct ieee80211_bss *bss)
186 {
187 u16 beacon_int = bss->cbss.beacon_interval;
188
189 if (beacon_int < 10)
190 beacon_int = 10;
191
192 __ieee80211_sta_join_ibss(sdata, bss->cbss.bssid,
193 beacon_int,
194 bss->cbss.channel,
195 bss->supp_rates_len, bss->supp_rates,
196 bss->cbss.capability,
197 bss->cbss.tsf);
198 }
199
200 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
201 struct ieee80211_mgmt *mgmt,
202 size_t len,
203 struct ieee80211_rx_status *rx_status,
204 struct ieee802_11_elems *elems,
205 bool beacon)
206 {
207 struct ieee80211_local *local = sdata->local;
208 int freq;
209 struct ieee80211_bss *bss;
210 struct sta_info *sta;
211 struct ieee80211_channel *channel;
212 u64 beacon_timestamp, rx_timestamp;
213 u32 supp_rates = 0;
214 enum ieee80211_band band = rx_status->band;
215
216 if (elems->ds_params && elems->ds_params_len == 1)
217 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
218 else
219 freq = rx_status->freq;
220
221 channel = ieee80211_get_channel(local->hw.wiphy, freq);
222
223 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
224 return;
225
226 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
227 memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) {
228 supp_rates = ieee80211_sta_get_rates(local, elems, band);
229
230 rcu_read_lock();
231
232 sta = sta_info_get(local, mgmt->sa);
233 if (sta) {
234 u32 prev_rates;
235
236 prev_rates = sta->sta.supp_rates[band];
237 /* make sure mandatory rates are always added */
238 sta->sta.supp_rates[band] = supp_rates |
239 ieee80211_mandatory_rates(local, band);
240
241 #ifdef CONFIG_MAC80211_IBSS_DEBUG
242 if (sta->sta.supp_rates[band] != prev_rates)
243 printk(KERN_DEBUG "%s: updated supp_rates set "
244 "for %pM based on beacon info (0x%llx | "
245 "0x%llx -> 0x%llx)\n",
246 sdata->dev->name,
247 sta->sta.addr,
248 (unsigned long long) prev_rates,
249 (unsigned long long) supp_rates,
250 (unsigned long long) sta->sta.supp_rates[band]);
251 #endif
252 } else
253 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
254
255 rcu_read_unlock();
256 }
257
258 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
259 channel, beacon);
260 if (!bss)
261 return;
262
263 /* was just updated in ieee80211_bss_info_update */
264 beacon_timestamp = bss->cbss.tsf;
265
266 /* check if we need to merge IBSS */
267
268 /* merge only on beacons (???) */
269 if (!beacon)
270 goto put_bss;
271
272 /* we use a fixed BSSID */
273 if (sdata->u.ibss.bssid)
274 goto put_bss;
275
276 /* not an IBSS */
277 if (!(bss->cbss.capability & WLAN_CAPABILITY_IBSS))
278 goto put_bss;
279
280 /* different channel */
281 if (bss->cbss.channel != local->oper_channel)
282 goto put_bss;
283
284 /* different SSID */
285 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
286 memcmp(elems->ssid, sdata->u.ibss.ssid,
287 sdata->u.ibss.ssid_len))
288 goto put_bss;
289
290 /* same BSSID */
291 if (memcmp(bss->cbss.bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0)
292 goto put_bss;
293
294 if (rx_status->flag & RX_FLAG_TSFT) {
295 /*
296 * For correct IBSS merging we need mactime; since mactime is
297 * defined as the time the first data symbol of the frame hits
298 * the PHY, and the timestamp of the beacon is defined as "the
299 * time that the data symbol containing the first bit of the
300 * timestamp is transmitted to the PHY plus the transmitting
301 * STA's delays through its local PHY from the MAC-PHY
302 * interface to its interface with the WM" (802.11 11.1.2)
303 * - equals the time this bit arrives at the receiver - we have
304 * to take into account the offset between the two.
305 *
306 * E.g. at 1 MBit that means mactime is 192 usec earlier
307 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
308 */
309 int rate;
310
311 if (rx_status->flag & RX_FLAG_HT)
312 rate = 65; /* TODO: HT rates */
313 else
314 rate = local->hw.wiphy->bands[band]->
315 bitrates[rx_status->rate_idx].bitrate;
316
317 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
318 } else {
319 /*
320 * second best option: get current TSF
321 * (will return -1 if not supported)
322 */
323 rx_timestamp = drv_get_tsf(local);
324 }
325
326 #ifdef CONFIG_MAC80211_IBSS_DEBUG
327 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
328 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
329 mgmt->sa, mgmt->bssid,
330 (unsigned long long)rx_timestamp,
331 (unsigned long long)beacon_timestamp,
332 (unsigned long long)(rx_timestamp - beacon_timestamp),
333 jiffies);
334 #endif
335
336 /* give slow hardware some time to do the TSF sync */
337 if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY)
338 goto put_bss;
339
340 if (beacon_timestamp > rx_timestamp) {
341 #ifdef CONFIG_MAC80211_IBSS_DEBUG
342 printk(KERN_DEBUG "%s: beacon TSF higher than "
343 "local TSF - IBSS merge with BSSID %pM\n",
344 sdata->dev->name, mgmt->bssid);
345 #endif
346 ieee80211_sta_join_ibss(sdata, bss);
347 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
348 }
349
350 put_bss:
351 ieee80211_rx_bss_put(local, bss);
352 }
353
354 /*
355 * Add a new IBSS station, will also be called by the RX code when,
356 * in IBSS mode, receiving a frame from a yet-unknown station, hence
357 * must be callable in atomic context.
358 */
359 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
360 u8 *bssid,u8 *addr, u32 supp_rates)
361 {
362 struct ieee80211_local *local = sdata->local;
363 struct sta_info *sta;
364 int band = local->hw.conf.channel->band;
365
366 /*
367 * XXX: Consider removing the least recently used entry and
368 * allow new one to be added.
369 */
370 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
371 if (net_ratelimit())
372 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
373 sdata->dev->name, addr);
374 return NULL;
375 }
376
377 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
378 return NULL;
379
380 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
381 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
382 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
383 #endif
384
385 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
386 if (!sta)
387 return NULL;
388
389 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
390
391 /* make sure mandatory rates are always added */
392 sta->sta.supp_rates[band] = supp_rates |
393 ieee80211_mandatory_rates(local, band);
394
395 rate_control_rate_init(sta);
396
397 if (sta_info_insert(sta))
398 return NULL;
399
400 return sta;
401 }
402
403 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
404 {
405 struct ieee80211_local *local = sdata->local;
406 int active = 0;
407 struct sta_info *sta;
408
409 rcu_read_lock();
410
411 list_for_each_entry_rcu(sta, &local->sta_list, list) {
412 if (sta->sdata == sdata &&
413 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
414 jiffies)) {
415 active++;
416 break;
417 }
418 }
419
420 rcu_read_unlock();
421
422 return active;
423 }
424
425
426 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
427 {
428 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
429
430 mod_timer(&ifibss->timer,
431 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
432
433 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
434
435 if (ieee80211_sta_active_ibss(sdata))
436 return;
437
438 if (ifibss->fixed_channel)
439 return;
440
441 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
442 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
443
444 ieee80211_request_internal_scan(sdata, ifibss->ssid, ifibss->ssid_len);
445 }
446
447 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
448 {
449 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
450 struct ieee80211_local *local = sdata->local;
451 struct ieee80211_supported_band *sband;
452 u8 *pos;
453 u8 bssid[ETH_ALEN];
454 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
455 u16 capability;
456 int i;
457
458 if (ifibss->fixed_bssid) {
459 memcpy(bssid, ifibss->bssid, ETH_ALEN);
460 } else {
461 /* Generate random, not broadcast, locally administered BSSID. Mix in
462 * own MAC address to make sure that devices that do not have proper
463 * random number generator get different BSSID. */
464 get_random_bytes(bssid, ETH_ALEN);
465 for (i = 0; i < ETH_ALEN; i++)
466 bssid[i] ^= sdata->dev->dev_addr[i];
467 bssid[0] &= ~0x01;
468 bssid[0] |= 0x02;
469 }
470
471 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
472 sdata->dev->name, bssid);
473
474 sband = local->hw.wiphy->bands[ifibss->channel->band];
475
476 capability = WLAN_CAPABILITY_IBSS;
477
478 if (sdata->default_key)
479 capability |= WLAN_CAPABILITY_PRIVACY;
480 else
481 sdata->drop_unencrypted = 0;
482
483 pos = supp_rates;
484 for (i = 0; i < sband->n_bitrates; i++) {
485 int rate = sband->bitrates[i].bitrate;
486 *pos++ = (u8) (rate / 5);
487 }
488
489 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
490 ifibss->channel, sband->n_bitrates,
491 supp_rates, capability, 0);
492 }
493
494 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
495 {
496 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
497 struct ieee80211_local *local = sdata->local;
498 struct ieee80211_bss *bss;
499 struct ieee80211_channel *chan = NULL;
500 const u8 *bssid = NULL;
501 int active_ibss;
502
503 active_ibss = ieee80211_sta_active_ibss(sdata);
504 #ifdef CONFIG_MAC80211_IBSS_DEBUG
505 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
506 sdata->dev->name, active_ibss);
507 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
508
509 if (active_ibss)
510 return;
511
512 if (ifibss->fixed_bssid)
513 bssid = ifibss->bssid;
514 if (ifibss->fixed_channel)
515 chan = ifibss->channel;
516 if (!is_zero_ether_addr(ifibss->bssid))
517 bssid = ifibss->bssid;
518 bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan, bssid,
519 ifibss->ssid, ifibss->ssid_len,
520 WLAN_CAPABILITY_IBSS,
521 WLAN_CAPABILITY_IBSS);
522
523 #ifdef CONFIG_MAC80211_IBSS_DEBUG
524 if (bss)
525 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
526 "%pM\n", bss->cbss.bssid, ifibss->bssid);
527 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
528
529 if (bss && memcmp(ifibss->bssid, bss->cbss.bssid, ETH_ALEN)) {
530 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
531 " based on configured SSID\n",
532 sdata->dev->name, bss->cbss.bssid);
533
534 ieee80211_sta_join_ibss(sdata, bss);
535 ieee80211_rx_bss_put(local, bss);
536 return;
537 } else if (bss)
538 ieee80211_rx_bss_put(local, bss);
539
540 #ifdef CONFIG_MAC80211_IBSS_DEBUG
541 printk(KERN_DEBUG " did not try to join ibss\n");
542 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
543
544 /* Selected IBSS not found in current scan results - try to scan */
545 if (ifibss->state == IEEE80211_IBSS_MLME_JOINED &&
546 !ieee80211_sta_active_ibss(sdata)) {
547 mod_timer(&ifibss->timer,
548 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
549 } else if (time_after(jiffies, ifibss->last_scan_completed +
550 IEEE80211_SCAN_INTERVAL)) {
551 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
552 "join\n", sdata->dev->name);
553
554 ieee80211_request_internal_scan(sdata, ifibss->ssid,
555 ifibss->ssid_len);
556 } else if (ifibss->state != IEEE80211_IBSS_MLME_JOINED) {
557 int interval = IEEE80211_SCAN_INTERVAL;
558
559 if (time_after(jiffies, ifibss->ibss_join_req +
560 IEEE80211_IBSS_JOIN_TIMEOUT)) {
561 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
562 ieee80211_sta_create_ibss(sdata);
563 return;
564 }
565 printk(KERN_DEBUG "%s: IBSS not allowed on"
566 " %d MHz\n", sdata->dev->name,
567 local->hw.conf.channel->center_freq);
568
569 /* No IBSS found - decrease scan interval and continue
570 * scanning. */
571 interval = IEEE80211_SCAN_INTERVAL_SLOW;
572 }
573
574 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
575 mod_timer(&ifibss->timer,
576 round_jiffies(jiffies + interval));
577 }
578 }
579
580 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
581 struct ieee80211_mgmt *mgmt,
582 size_t len)
583 {
584 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
585 struct ieee80211_local *local = sdata->local;
586 int tx_last_beacon;
587 struct sk_buff *skb;
588 struct ieee80211_mgmt *resp;
589 u8 *pos, *end;
590
591 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
592 len < 24 + 2 || !ifibss->presp)
593 return;
594
595 tx_last_beacon = drv_tx_last_beacon(local);
596
597 #ifdef CONFIG_MAC80211_IBSS_DEBUG
598 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
599 " (tx_last_beacon=%d)\n",
600 sdata->dev->name, mgmt->sa, mgmt->da,
601 mgmt->bssid, tx_last_beacon);
602 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
603
604 if (!tx_last_beacon)
605 return;
606
607 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
608 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
609 return;
610
611 end = ((u8 *) mgmt) + len;
612 pos = mgmt->u.probe_req.variable;
613 if (pos[0] != WLAN_EID_SSID ||
614 pos + 2 + pos[1] > end) {
615 #ifdef CONFIG_MAC80211_IBSS_DEBUG
616 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
617 "from %pM\n",
618 sdata->dev->name, mgmt->sa);
619 #endif
620 return;
621 }
622 if (pos[1] != 0 &&
623 (pos[1] != ifibss->ssid_len ||
624 !memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
625 /* Ignore ProbeReq for foreign SSID */
626 return;
627 }
628
629 /* Reply with ProbeResp */
630 skb = skb_copy(ifibss->presp, GFP_KERNEL);
631 if (!skb)
632 return;
633
634 resp = (struct ieee80211_mgmt *) skb->data;
635 memcpy(resp->da, mgmt->sa, ETH_ALEN);
636 #ifdef CONFIG_MAC80211_IBSS_DEBUG
637 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
638 sdata->dev->name, resp->da);
639 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
640 ieee80211_tx_skb(sdata, skb, 0);
641 }
642
643 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
644 struct ieee80211_mgmt *mgmt,
645 size_t len,
646 struct ieee80211_rx_status *rx_status)
647 {
648 size_t baselen;
649 struct ieee802_11_elems elems;
650
651 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
652 return; /* ignore ProbeResp to foreign address */
653
654 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
655 if (baselen > len)
656 return;
657
658 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
659 &elems);
660
661 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
662 }
663
664 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
665 struct ieee80211_mgmt *mgmt,
666 size_t len,
667 struct ieee80211_rx_status *rx_status)
668 {
669 size_t baselen;
670 struct ieee802_11_elems elems;
671
672 /* Process beacon from the current BSS */
673 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
674 if (baselen > len)
675 return;
676
677 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
678
679 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
680 }
681
682 static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
683 struct sk_buff *skb)
684 {
685 struct ieee80211_rx_status *rx_status;
686 struct ieee80211_mgmt *mgmt;
687 u16 fc;
688
689 rx_status = (struct ieee80211_rx_status *) skb->cb;
690 mgmt = (struct ieee80211_mgmt *) skb->data;
691 fc = le16_to_cpu(mgmt->frame_control);
692
693 switch (fc & IEEE80211_FCTL_STYPE) {
694 case IEEE80211_STYPE_PROBE_REQ:
695 ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len);
696 break;
697 case IEEE80211_STYPE_PROBE_RESP:
698 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
699 rx_status);
700 break;
701 case IEEE80211_STYPE_BEACON:
702 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
703 rx_status);
704 break;
705 case IEEE80211_STYPE_AUTH:
706 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
707 break;
708 }
709
710 kfree_skb(skb);
711 }
712
713 static void ieee80211_ibss_work(struct work_struct *work)
714 {
715 struct ieee80211_sub_if_data *sdata =
716 container_of(work, struct ieee80211_sub_if_data, u.ibss.work);
717 struct ieee80211_local *local = sdata->local;
718 struct ieee80211_if_ibss *ifibss;
719 struct sk_buff *skb;
720
721 if (!netif_running(sdata->dev))
722 return;
723
724 if (local->sw_scanning || local->hw_scanning)
725 return;
726
727 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC))
728 return;
729 ifibss = &sdata->u.ibss;
730
731 while ((skb = skb_dequeue(&ifibss->skb_queue)))
732 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
733
734 if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request))
735 return;
736
737 switch (ifibss->state) {
738 case IEEE80211_IBSS_MLME_SEARCH:
739 ieee80211_sta_find_ibss(sdata);
740 break;
741 case IEEE80211_IBSS_MLME_JOINED:
742 ieee80211_sta_merge_ibss(sdata);
743 break;
744 default:
745 WARN_ON(1);
746 break;
747 }
748 }
749
750 static void ieee80211_ibss_timer(unsigned long data)
751 {
752 struct ieee80211_sub_if_data *sdata =
753 (struct ieee80211_sub_if_data *) data;
754 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
755 struct ieee80211_local *local = sdata->local;
756
757 set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request);
758 queue_work(local->hw.workqueue, &ifibss->work);
759 }
760
761 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
762 {
763 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
764
765 INIT_WORK(&ifibss->work, ieee80211_ibss_work);
766 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
767 (unsigned long) sdata);
768 skb_queue_head_init(&ifibss->skb_queue);
769 }
770
771 /* scan finished notification */
772 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
773 {
774 struct ieee80211_sub_if_data *sdata;
775
776 mutex_lock(&local->iflist_mtx);
777 list_for_each_entry(sdata, &local->interfaces, list) {
778 if (!netif_running(sdata->dev))
779 continue;
780 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
781 continue;
782 if (!sdata->u.ibss.ssid_len)
783 continue;
784 sdata->u.ibss.last_scan_completed = jiffies;
785 ieee80211_sta_find_ibss(sdata);
786 }
787 mutex_unlock(&local->iflist_mtx);
788 }
789
790 ieee80211_rx_result
791 ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
792 struct ieee80211_rx_status *rx_status)
793 {
794 struct ieee80211_local *local = sdata->local;
795 struct ieee80211_mgmt *mgmt;
796 u16 fc;
797
798 if (skb->len < 24)
799 return RX_DROP_MONITOR;
800
801 mgmt = (struct ieee80211_mgmt *) skb->data;
802 fc = le16_to_cpu(mgmt->frame_control);
803
804 switch (fc & IEEE80211_FCTL_STYPE) {
805 case IEEE80211_STYPE_PROBE_RESP:
806 case IEEE80211_STYPE_BEACON:
807 memcpy(skb->cb, rx_status, sizeof(*rx_status));
808 case IEEE80211_STYPE_PROBE_REQ:
809 case IEEE80211_STYPE_AUTH:
810 skb_queue_tail(&sdata->u.ibss.skb_queue, skb);
811 queue_work(local->hw.workqueue, &sdata->u.ibss.work);
812 return RX_QUEUED;
813 }
814
815 return RX_DROP_MONITOR;
816 }
817
818 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
819 struct cfg80211_ibss_params *params)
820 {
821 struct sk_buff *skb;
822
823 if (params->bssid) {
824 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
825 sdata->u.ibss.fixed_bssid = true;
826 } else
827 sdata->u.ibss.fixed_bssid = false;
828
829 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
830
831 sdata->u.ibss.channel = params->channel;
832 sdata->u.ibss.fixed_channel = params->channel_fixed;
833
834 if (params->ie) {
835 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
836 GFP_KERNEL);
837 if (sdata->u.ibss.ie)
838 sdata->u.ibss.ie_len = params->ie_len;
839 }
840
841 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
842 36 /* bitrates */ +
843 34 /* SSID */ +
844 3 /* DS params */ +
845 4 /* IBSS params */ +
846 params->ie_len);
847 if (!skb)
848 return -ENOMEM;
849
850 sdata->u.ibss.skb = skb;
851 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
852 sdata->u.ibss.ibss_join_req = jiffies;
853
854 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
855
856 /*
857 * The ssid_len setting below is used to see whether
858 * we are active, and we need all other settings
859 * before that may get visible.
860 */
861 mb();
862
863 sdata->u.ibss.ssid_len = params->ssid_len;
864
865 set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
866 queue_work(sdata->local->hw.workqueue, &sdata->u.ibss.work);
867
868 return 0;
869 }
870
871 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
872 {
873 struct sk_buff *skb;
874
875 del_timer_sync(&sdata->u.ibss.timer);
876 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
877 cancel_work_sync(&sdata->u.ibss.work);
878 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
879
880 sta_info_flush(sdata->local, sdata);
881
882 /* remove beacon */
883 kfree(sdata->u.ibss.ie);
884 skb = sdata->u.ibss.presp;
885 rcu_assign_pointer(sdata->u.ibss.presp, NULL);
886 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
887 synchronize_rcu();
888 kfree_skb(skb);
889
890 skb_queue_purge(&sdata->u.ibss.skb_queue);
891 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
892
893 return 0;
894 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree