?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
mac80211: unify config_interface and bss_info_changed
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / ibss.c
blobc87caad383f07a639c10b9aa228bbc3bb5d93a8e
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 "rate.h"
26
27 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
28 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
30
31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
32 #define IEEE80211_IBSS_MERGE_DELAY 0x400000
33 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
34
35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
36
37
38 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
39 struct ieee80211_mgmt *mgmt,
40 size_t len)
41 {
42 u16 auth_alg, auth_transaction, status_code;
43
44 if (len < 24 + 6)
45 return;
46
47 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
48 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
49 status_code = le16_to_cpu(mgmt->u.auth.status_code);
50
51 /*
52 * IEEE 802.11 standard does not require authentication in IBSS
53 * networks and most implementations do not seem to use it.
54 * However, try to reply to authentication attempts if someone
55 * has actually implemented this.
56 */
57 if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1)
58 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
59 sdata->u.ibss.bssid, 0);
60 }
61
62 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
63 const u8 *bssid, const int beacon_int,
64 struct ieee80211_channel *chan,
65 const size_t supp_rates_len,
66 const u8 *supp_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, j;
72 struct sk_buff *skb;
73 struct ieee80211_mgmt *mgmt;
74 u8 *pos;
75 struct ieee80211_supported_band *sband;
76 u32 bss_change;
77
78 if (local->ops->reset_tsf) {
79 /* Reset own TSF to allow time synchronization work. */
80 local->ops->reset_tsf(local_to_hw(local));
81 }
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 if (local && local->ops && local->ops->get_tsf)
319 /* second best option: get current TSF */
320 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
321 else
322 /* can't merge without knowing the TSF */
323 rx_timestamp = -1LLU;
324
325 #ifdef CONFIG_MAC80211_IBSS_DEBUG
326 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
327 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
328 mgmt->sa, mgmt->bssid,
329 (unsigned long long)rx_timestamp,
330 (unsigned long long)beacon_timestamp,
331 (unsigned long long)(rx_timestamp - beacon_timestamp),
332 jiffies);
333 #endif
334
335 /* give slow hardware some time to do the TSF sync */
336 if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY)
337 goto put_bss;
338
339 if (beacon_timestamp > rx_timestamp) {
340 #ifdef CONFIG_MAC80211_IBSS_DEBUG
341 printk(KERN_DEBUG "%s: beacon TSF higher than "
342 "local TSF - IBSS merge with BSSID %pM\n",
343 sdata->dev->name, mgmt->bssid);
344 #endif
345 ieee80211_sta_join_ibss(sdata, bss);
346 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
347 }
348
349 put_bss:
350 ieee80211_rx_bss_put(local, bss);
351 }
352
353 /*
354 * Add a new IBSS station, will also be called by the RX code when,
355 * in IBSS mode, receiving a frame from a yet-unknown station, hence
356 * must be callable in atomic context.
357 */
358 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
359 u8 *bssid,u8 *addr, u32 supp_rates)
360 {
361 struct ieee80211_local *local = sdata->local;
362 struct sta_info *sta;
363 int band = local->hw.conf.channel->band;
364
365 /*
366 * XXX: Consider removing the least recently used entry and
367 * allow new one to be added.
368 */
369 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
370 if (net_ratelimit())
371 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
372 sdata->dev->name, addr);
373 return NULL;
374 }
375
376 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
377 return NULL;
378
379 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
380 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
381 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
382 #endif
383
384 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
385 if (!sta)
386 return NULL;
387
388 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
389
390 /* make sure mandatory rates are always added */
391 sta->sta.supp_rates[band] = supp_rates |
392 ieee80211_mandatory_rates(local, band);
393
394 rate_control_rate_init(sta);
395
396 if (sta_info_insert(sta))
397 return NULL;
398
399 return sta;
400 }
401
402 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
403 {
404 struct ieee80211_local *local = sdata->local;
405 int active = 0;
406 struct sta_info *sta;
407
408 rcu_read_lock();
409
410 list_for_each_entry_rcu(sta, &local->sta_list, list) {
411 if (sta->sdata == sdata &&
412 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
413 jiffies)) {
414 active++;
415 break;
416 }
417 }
418
419 rcu_read_unlock();
420
421 return active;
422 }
423
424
425 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
426 {
427 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
428
429 mod_timer(&ifibss->timer,
430 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
431
432 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
433
434 if (ieee80211_sta_active_ibss(sdata))
435 return;
436
437 if (ifibss->fixed_channel)
438 return;
439
440 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
441 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
442
443 ieee80211_request_internal_scan(sdata, ifibss->ssid, ifibss->ssid_len);
444 }
445
446 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
447 {
448 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
449 struct ieee80211_local *local = sdata->local;
450 struct ieee80211_supported_band *sband;
451 u8 *pos;
452 u8 bssid[ETH_ALEN];
453 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
454 u16 capability;
455 int i;
456
457 if (ifibss->fixed_bssid) {
458 memcpy(bssid, ifibss->bssid, ETH_ALEN);
459 } else {
460 /* Generate random, not broadcast, locally administered BSSID. Mix in
461 * own MAC address to make sure that devices that do not have proper
462 * random number generator get different BSSID. */
463 get_random_bytes(bssid, ETH_ALEN);
464 for (i = 0; i < ETH_ALEN; i++)
465 bssid[i] ^= sdata->dev->dev_addr[i];
466 bssid[0] &= ~0x01;
467 bssid[0] |= 0x02;
468 }
469
470 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
471 sdata->dev->name, bssid);
472
473 sband = local->hw.wiphy->bands[ifibss->channel->band];
474
475 capability = WLAN_CAPABILITY_IBSS;
476
477 if (sdata->default_key)
478 capability |= WLAN_CAPABILITY_PRIVACY;
479 else
480 sdata->drop_unencrypted = 0;
481
482 pos = supp_rates;
483 for (i = 0; i < sband->n_bitrates; i++) {
484 int rate = sband->bitrates[i].bitrate;
485 *pos++ = (u8) (rate / 5);
486 }
487
488 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
489 ifibss->channel, sband->n_bitrates,
490 supp_rates, capability, 0);
491 }
492
493 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
494 {
495 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
496 struct ieee80211_local *local = sdata->local;
497 struct ieee80211_bss *bss;
498 struct ieee80211_channel *chan = NULL;
499 const u8 *bssid = NULL;
500 int active_ibss;
501
502 active_ibss = ieee80211_sta_active_ibss(sdata);
503 #ifdef CONFIG_MAC80211_IBSS_DEBUG
504 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
505 sdata->dev->name, active_ibss);
506 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
507
508 if (active_ibss)
509 return;
510
511 if (ifibss->fixed_bssid)
512 bssid = ifibss->bssid;
513 if (ifibss->fixed_channel)
514 chan = ifibss->channel;
515 if (!is_zero_ether_addr(ifibss->bssid))
516 bssid = ifibss->bssid;
517 bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan, bssid,
518 ifibss->ssid, ifibss->ssid_len,
519 WLAN_CAPABILITY_IBSS,
520 WLAN_CAPABILITY_IBSS);
521
522 #ifdef CONFIG_MAC80211_IBSS_DEBUG
523 if (bss)
524 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
525 "%pM\n", bss->cbss.bssid, ifibss->bssid);
526 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
527
528 if (bss && memcmp(ifibss->bssid, bss->cbss.bssid, ETH_ALEN)) {
529 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
530 " based on configured SSID\n",
531 sdata->dev->name, bss->cbss.bssid);
532
533 ieee80211_sta_join_ibss(sdata, bss);
534 ieee80211_rx_bss_put(local, bss);
535 return;
536 } else if (bss)
537 ieee80211_rx_bss_put(local, bss);
538
539 #ifdef CONFIG_MAC80211_IBSS_DEBUG
540 printk(KERN_DEBUG " did not try to join ibss\n");
541 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
542
543 /* Selected IBSS not found in current scan results - try to scan */
544 if (ifibss->state == IEEE80211_IBSS_MLME_JOINED &&
545 !ieee80211_sta_active_ibss(sdata)) {
546 mod_timer(&ifibss->timer,
547 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
548 } else if (time_after(jiffies, ifibss->last_scan_completed +
549 IEEE80211_SCAN_INTERVAL)) {
550 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
551 "join\n", sdata->dev->name);
552
553 ieee80211_request_internal_scan(sdata, ifibss->ssid,
554 ifibss->ssid_len);
555 } else if (ifibss->state != IEEE80211_IBSS_MLME_JOINED) {
556 int interval = IEEE80211_SCAN_INTERVAL;
557
558 if (time_after(jiffies, ifibss->ibss_join_req +
559 IEEE80211_IBSS_JOIN_TIMEOUT)) {
560 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
561 ieee80211_sta_create_ibss(sdata);
562 return;
563 }
564 printk(KERN_DEBUG "%s: IBSS not allowed on"
565 " %d MHz\n", sdata->dev->name,
566 local->hw.conf.channel->center_freq);
567
568 /* No IBSS found - decrease scan interval and continue
569 * scanning. */
570 interval = IEEE80211_SCAN_INTERVAL_SLOW;
571 }
572
573 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
574 mod_timer(&ifibss->timer,
575 round_jiffies(jiffies + interval));
576 }
577 }
578
579 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
580 struct ieee80211_mgmt *mgmt,
581 size_t len)
582 {
583 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
584 struct ieee80211_local *local = sdata->local;
585 int tx_last_beacon;
586 struct sk_buff *skb;
587 struct ieee80211_mgmt *resp;
588 u8 *pos, *end;
589
590 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
591 len < 24 + 2 || !ifibss->presp)
592 return;
593
594 if (local->ops->tx_last_beacon)
595 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
596 else
597 tx_last_beacon = 1;
598
599 #ifdef CONFIG_MAC80211_IBSS_DEBUG
600 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
601 " (tx_last_beacon=%d)\n",
602 sdata->dev->name, mgmt->sa, mgmt->da,
603 mgmt->bssid, tx_last_beacon);
604 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
605
606 if (!tx_last_beacon)
607 return;
608
609 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
610 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
611 return;
612
613 end = ((u8 *) mgmt) + len;
614 pos = mgmt->u.probe_req.variable;
615 if (pos[0] != WLAN_EID_SSID ||
616 pos + 2 + pos[1] > end) {
617 #ifdef CONFIG_MAC80211_IBSS_DEBUG
618 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
619 "from %pM\n",
620 sdata->dev->name, mgmt->sa);
621 #endif
622 return;
623 }
624 if (pos[1] != 0 &&
625 (pos[1] != ifibss->ssid_len ||
626 !memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
627 /* Ignore ProbeReq for foreign SSID */
628 return;
629 }
630
631 /* Reply with ProbeResp */
632 skb = skb_copy(ifibss->presp, GFP_KERNEL);
633 if (!skb)
634 return;
635
636 resp = (struct ieee80211_mgmt *) skb->data;
637 memcpy(resp->da, mgmt->sa, ETH_ALEN);
638 #ifdef CONFIG_MAC80211_IBSS_DEBUG
639 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
640 sdata->dev->name, resp->da);
641 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
642 ieee80211_tx_skb(sdata, skb, 0);
643 }
644
645 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
646 struct ieee80211_mgmt *mgmt,
647 size_t len,
648 struct ieee80211_rx_status *rx_status)
649 {
650 size_t baselen;
651 struct ieee802_11_elems elems;
652
653 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
654 return; /* ignore ProbeResp to foreign address */
655
656 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
657 if (baselen > len)
658 return;
659
660 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
661 &elems);
662
663 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
664 }
665
666 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
667 struct ieee80211_mgmt *mgmt,
668 size_t len,
669 struct ieee80211_rx_status *rx_status)
670 {
671 size_t baselen;
672 struct ieee802_11_elems elems;
673
674 /* Process beacon from the current BSS */
675 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
676 if (baselen > len)
677 return;
678
679 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
680
681 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
682 }
683
684 static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
685 struct sk_buff *skb)
686 {
687 struct ieee80211_rx_status *rx_status;
688 struct ieee80211_mgmt *mgmt;
689 u16 fc;
690
691 rx_status = (struct ieee80211_rx_status *) skb->cb;
692 mgmt = (struct ieee80211_mgmt *) skb->data;
693 fc = le16_to_cpu(mgmt->frame_control);
694
695 switch (fc & IEEE80211_FCTL_STYPE) {
696 case IEEE80211_STYPE_PROBE_REQ:
697 ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len);
698 break;
699 case IEEE80211_STYPE_PROBE_RESP:
700 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
701 rx_status);
702 break;
703 case IEEE80211_STYPE_BEACON:
704 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
705 rx_status);
706 break;
707 case IEEE80211_STYPE_AUTH:
708 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
709 break;
710 }
711
712 kfree_skb(skb);
713 }
714
715 static void ieee80211_ibss_work(struct work_struct *work)
716 {
717 struct ieee80211_sub_if_data *sdata =
718 container_of(work, struct ieee80211_sub_if_data, u.ibss.work);
719 struct ieee80211_local *local = sdata->local;
720 struct ieee80211_if_ibss *ifibss;
721 struct sk_buff *skb;
722
723 if (!netif_running(sdata->dev))
724 return;
725
726 if (local->sw_scanning || local->hw_scanning)
727 return;
728
729 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC))
730 return;
731 ifibss = &sdata->u.ibss;
732
733 while ((skb = skb_dequeue(&ifibss->skb_queue)))
734 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
735
736 if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request))
737 return;
738
739 switch (ifibss->state) {
740 case IEEE80211_IBSS_MLME_SEARCH:
741 ieee80211_sta_find_ibss(sdata);
742 break;
743 case IEEE80211_IBSS_MLME_JOINED:
744 ieee80211_sta_merge_ibss(sdata);
745 break;
746 default:
747 WARN_ON(1);
748 break;
749 }
750 }
751
752 static void ieee80211_ibss_timer(unsigned long data)
753 {
754 struct ieee80211_sub_if_data *sdata =
755 (struct ieee80211_sub_if_data *) data;
756 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
757 struct ieee80211_local *local = sdata->local;
758
759 set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request);
760 queue_work(local->hw.workqueue, &ifibss->work);
761 }
762
763 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
764 {
765 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
766
767 INIT_WORK(&ifibss->work, ieee80211_ibss_work);
768 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
769 (unsigned long) sdata);
770 skb_queue_head_init(&ifibss->skb_queue);
771 }
772
773 /* scan finished notification */
774 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
775 {
776 struct ieee80211_sub_if_data *sdata;
777
778 mutex_lock(&local->iflist_mtx);
779 list_for_each_entry(sdata, &local->interfaces, list) {
780 if (!netif_running(sdata->dev))
781 continue;
782 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
783 continue;
784 if (!sdata->u.ibss.ssid_len)
785 continue;
786 sdata->u.ibss.last_scan_completed = jiffies;
787 ieee80211_sta_find_ibss(sdata);
788 }
789 mutex_unlock(&local->iflist_mtx);
790 }
791
792 ieee80211_rx_result
793 ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
794 struct ieee80211_rx_status *rx_status)
795 {
796 struct ieee80211_local *local = sdata->local;
797 struct ieee80211_mgmt *mgmt;
798 u16 fc;
799
800 if (skb->len < 24)
801 return RX_DROP_MONITOR;
802
803 mgmt = (struct ieee80211_mgmt *) skb->data;
804 fc = le16_to_cpu(mgmt->frame_control);
805
806 switch (fc & IEEE80211_FCTL_STYPE) {
807 case IEEE80211_STYPE_PROBE_RESP:
808 case IEEE80211_STYPE_BEACON:
809 memcpy(skb->cb, rx_status, sizeof(*rx_status));
810 case IEEE80211_STYPE_PROBE_REQ:
811 case IEEE80211_STYPE_AUTH:
812 skb_queue_tail(&sdata->u.ibss.skb_queue, skb);
813 queue_work(local->hw.workqueue, &sdata->u.ibss.work);
814 return RX_QUEUED;
815 }
816
817 return RX_DROP_MONITOR;
818 }
819
820 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
821 struct cfg80211_ibss_params *params)
822 {
823 struct sk_buff *skb;
824
825 if (params->bssid) {
826 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
827 sdata->u.ibss.fixed_bssid = true;
828 } else
829 sdata->u.ibss.fixed_bssid = false;
830
831 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
832
833 sdata->u.ibss.channel = params->channel;
834 sdata->u.ibss.fixed_channel = params->channel_fixed;
835
836 if (params->ie) {
837 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
838 GFP_KERNEL);
839 if (sdata->u.ibss.ie)
840 sdata->u.ibss.ie_len = params->ie_len;
841 }
842
843 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
844 36 /* bitrates */ +
845 34 /* SSID */ +
846 3 /* DS params */ +
847 4 /* IBSS params */ +
848 params->ie_len);
849 if (!skb)
850 return -ENOMEM;
851
852 sdata->u.ibss.skb = skb;
853 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
854 sdata->u.ibss.ibss_join_req = jiffies;
855
856 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
857
858 /*
859 * The ssid_len setting below is used to see whether
860 * we are active, and we need all other settings
861 * before that may get visible.
862 */
863 mb();
864
865 sdata->u.ibss.ssid_len = params->ssid_len;
866
867 set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
868 queue_work(sdata->local->hw.workqueue, &sdata->u.ibss.work);
869
870 return 0;
871 }
872
873 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
874 {
875 struct sk_buff *skb;
876
877 del_timer_sync(&sdata->u.ibss.timer);
878 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
879 cancel_work_sync(&sdata->u.ibss.work);
880 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
881
882 sta_info_flush(sdata->local, sdata);
883
884 /* remove beacon */
885 kfree(sdata->u.ibss.ie);
886 skb = sdata->u.ibss.presp;
887 rcu_assign_pointer(sdata->u.ibss.presp, NULL);
888 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
889 synchronize_rcu();
890 kfree_skb(skb);
891
892 skb_queue_purge(&sdata->u.ibss.skb_queue);
893 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
894
895 return 0;
896 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree