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mac80211: Replace {sw, hw}_scanning variables with a bitfield
[GitHub/LineageOS/android_kernel_samsung_universal7580.git] / net / mac80211 / ibss.c
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 u32 bss_change;
77 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
78
79 /* Reset own TSF to allow time synchronization work. */
80 drv_reset_tsf(local);
81
82 skb = ifibss->skb;
83 rcu_assign_pointer(ifibss->presp, NULL);
84 synchronize_rcu();
85 skb->data = skb->head;
86 skb->len = 0;
87 skb_reset_tail_pointer(skb);
88 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
89
90 if (memcmp(ifibss->bssid, bssid, ETH_ALEN))
91 sta_info_flush(sdata->local, sdata);
92
93 memcpy(ifibss->bssid, bssid, ETH_ALEN);
94
95 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
96
97 local->oper_channel = chan;
98 local->oper_channel_type = NL80211_CHAN_NO_HT;
99 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
100
101 sband = local->hw.wiphy->bands[chan->band];
102
103 /* build supported rates array */
104 pos = supp_rates;
105 for (i = 0; i < sband->n_bitrates; i++) {
106 int rate = sband->bitrates[i].bitrate;
107 u8 basic = 0;
108 if (basic_rates & BIT(i))
109 basic = 0x80;
110 *pos++ = basic | (u8) (rate / 5);
111 }
112
113 /* Build IBSS probe response */
114 mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
115 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
116 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
117 IEEE80211_STYPE_PROBE_RESP);
118 memset(mgmt->da, 0xff, ETH_ALEN);
119 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
120 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
121 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
122 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
123 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
124
125 pos = skb_put(skb, 2 + ifibss->ssid_len);
126 *pos++ = WLAN_EID_SSID;
127 *pos++ = ifibss->ssid_len;
128 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
129
130 rates = sband->n_bitrates;
131 if (rates > 8)
132 rates = 8;
133 pos = skb_put(skb, 2 + rates);
134 *pos++ = WLAN_EID_SUPP_RATES;
135 *pos++ = rates;
136 memcpy(pos, supp_rates, rates);
137
138 if (sband->band == IEEE80211_BAND_2GHZ) {
139 pos = skb_put(skb, 2 + 1);
140 *pos++ = WLAN_EID_DS_PARAMS;
141 *pos++ = 1;
142 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
143 }
144
145 pos = skb_put(skb, 2 + 2);
146 *pos++ = WLAN_EID_IBSS_PARAMS;
147 *pos++ = 2;
148 /* FIX: set ATIM window based on scan results */
149 *pos++ = 0;
150 *pos++ = 0;
151
152 if (sband->n_bitrates > 8) {
153 rates = sband->n_bitrates - 8;
154 pos = skb_put(skb, 2 + rates);
155 *pos++ = WLAN_EID_EXT_SUPP_RATES;
156 *pos++ = rates;
157 memcpy(pos, &supp_rates[8], rates);
158 }
159
160 if (ifibss->ie_len)
161 memcpy(skb_put(skb, ifibss->ie_len),
162 ifibss->ie, ifibss->ie_len);
163
164 rcu_assign_pointer(ifibss->presp, skb);
165
166 sdata->vif.bss_conf.beacon_int = beacon_int;
167 bss_change = BSS_CHANGED_BEACON_INT;
168 bss_change |= ieee80211_reset_erp_info(sdata);
169 bss_change |= BSS_CHANGED_BSSID;
170 bss_change |= BSS_CHANGED_BEACON;
171 bss_change |= BSS_CHANGED_BEACON_ENABLED;
172 ieee80211_bss_info_change_notify(sdata, bss_change);
173
174 ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
175
176 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
177 mod_timer(&ifibss->timer,
178 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
179
180 cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
181 mgmt, skb->len, 0, GFP_KERNEL);
182 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
183 }
184
185 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
186 struct ieee80211_bss *bss)
187 {
188 struct ieee80211_supported_band *sband;
189 u32 basic_rates;
190 int i, j;
191 u16 beacon_int = bss->cbss.beacon_interval;
192
193 if (beacon_int < 10)
194 beacon_int = 10;
195
196 sband = sdata->local->hw.wiphy->bands[bss->cbss.channel->band];
197
198 basic_rates = 0;
199
200 for (i = 0; i < bss->supp_rates_len; i++) {
201 int rate = (bss->supp_rates[i] & 0x7f) * 5;
202 bool is_basic = !!(bss->supp_rates[i] & 0x80);
203
204 for (j = 0; j < sband->n_bitrates; j++) {
205 if (sband->bitrates[j].bitrate == rate) {
206 if (is_basic)
207 basic_rates |= BIT(j);
208 break;
209 }
210 }
211 }
212
213 __ieee80211_sta_join_ibss(sdata, bss->cbss.bssid,
214 beacon_int,
215 bss->cbss.channel,
216 basic_rates,
217 bss->cbss.capability,
218 bss->cbss.tsf);
219 }
220
221 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
222 struct ieee80211_mgmt *mgmt,
223 size_t len,
224 struct ieee80211_rx_status *rx_status,
225 struct ieee802_11_elems *elems,
226 bool beacon)
227 {
228 struct ieee80211_local *local = sdata->local;
229 int freq;
230 struct ieee80211_bss *bss;
231 struct sta_info *sta;
232 struct ieee80211_channel *channel;
233 u64 beacon_timestamp, rx_timestamp;
234 u32 supp_rates = 0;
235 enum ieee80211_band band = rx_status->band;
236
237 if (elems->ds_params && elems->ds_params_len == 1)
238 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
239 else
240 freq = rx_status->freq;
241
242 channel = ieee80211_get_channel(local->hw.wiphy, freq);
243
244 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
245 return;
246
247 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
248 memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) {
249 supp_rates = ieee80211_sta_get_rates(local, elems, band);
250
251 rcu_read_lock();
252
253 sta = sta_info_get(local, mgmt->sa);
254 if (sta) {
255 u32 prev_rates;
256
257 prev_rates = sta->sta.supp_rates[band];
258 /* make sure mandatory rates are always added */
259 sta->sta.supp_rates[band] = supp_rates |
260 ieee80211_mandatory_rates(local, band);
261
262 #ifdef CONFIG_MAC80211_IBSS_DEBUG
263 if (sta->sta.supp_rates[band] != prev_rates)
264 printk(KERN_DEBUG "%s: updated supp_rates set "
265 "for %pM based on beacon info (0x%llx | "
266 "0x%llx -> 0x%llx)\n",
267 sdata->dev->name,
268 sta->sta.addr,
269 (unsigned long long) prev_rates,
270 (unsigned long long) supp_rates,
271 (unsigned long long) sta->sta.supp_rates[band]);
272 #endif
273 } else
274 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
275
276 rcu_read_unlock();
277 }
278
279 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
280 channel, beacon);
281 if (!bss)
282 return;
283
284 /* was just updated in ieee80211_bss_info_update */
285 beacon_timestamp = bss->cbss.tsf;
286
287 /* check if we need to merge IBSS */
288
289 /* merge only on beacons (???) */
290 if (!beacon)
291 goto put_bss;
292
293 /* we use a fixed BSSID */
294 if (sdata->u.ibss.bssid)
295 goto put_bss;
296
297 /* not an IBSS */
298 if (!(bss->cbss.capability & WLAN_CAPABILITY_IBSS))
299 goto put_bss;
300
301 /* different channel */
302 if (bss->cbss.channel != local->oper_channel)
303 goto put_bss;
304
305 /* different SSID */
306 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
307 memcmp(elems->ssid, sdata->u.ibss.ssid,
308 sdata->u.ibss.ssid_len))
309 goto put_bss;
310
311 /* same BSSID */
312 if (memcmp(bss->cbss.bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0)
313 goto put_bss;
314
315 if (rx_status->flag & RX_FLAG_TSFT) {
316 /*
317 * For correct IBSS merging we need mactime; since mactime is
318 * defined as the time the first data symbol of the frame hits
319 * the PHY, and the timestamp of the beacon is defined as "the
320 * time that the data symbol containing the first bit of the
321 * timestamp is transmitted to the PHY plus the transmitting
322 * STA's delays through its local PHY from the MAC-PHY
323 * interface to its interface with the WM" (802.11 11.1.2)
324 * - equals the time this bit arrives at the receiver - we have
325 * to take into account the offset between the two.
326 *
327 * E.g. at 1 MBit that means mactime is 192 usec earlier
328 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
329 */
330 int rate;
331
332 if (rx_status->flag & RX_FLAG_HT)
333 rate = 65; /* TODO: HT rates */
334 else
335 rate = local->hw.wiphy->bands[band]->
336 bitrates[rx_status->rate_idx].bitrate;
337
338 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
339 } else {
340 /*
341 * second best option: get current TSF
342 * (will return -1 if not supported)
343 */
344 rx_timestamp = drv_get_tsf(local);
345 }
346
347 #ifdef CONFIG_MAC80211_IBSS_DEBUG
348 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
349 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
350 mgmt->sa, mgmt->bssid,
351 (unsigned long long)rx_timestamp,
352 (unsigned long long)beacon_timestamp,
353 (unsigned long long)(rx_timestamp - beacon_timestamp),
354 jiffies);
355 #endif
356
357 /* give slow hardware some time to do the TSF sync */
358 if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY)
359 goto put_bss;
360
361 if (beacon_timestamp > rx_timestamp) {
362 #ifdef CONFIG_MAC80211_IBSS_DEBUG
363 printk(KERN_DEBUG "%s: beacon TSF higher than "
364 "local TSF - IBSS merge with BSSID %pM\n",
365 sdata->dev->name, mgmt->bssid);
366 #endif
367 ieee80211_sta_join_ibss(sdata, bss);
368 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
369 }
370
371 put_bss:
372 ieee80211_rx_bss_put(local, bss);
373 }
374
375 /*
376 * Add a new IBSS station, will also be called by the RX code when,
377 * in IBSS mode, receiving a frame from a yet-unknown station, hence
378 * must be callable in atomic context.
379 */
380 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
381 u8 *bssid,u8 *addr, u32 supp_rates)
382 {
383 struct ieee80211_local *local = sdata->local;
384 struct sta_info *sta;
385 int band = local->hw.conf.channel->band;
386
387 /*
388 * XXX: Consider removing the least recently used entry and
389 * allow new one to be added.
390 */
391 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
392 if (net_ratelimit())
393 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
394 sdata->dev->name, addr);
395 return NULL;
396 }
397
398 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
399 return NULL;
400
401 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
402 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
403 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
404 #endif
405
406 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
407 if (!sta)
408 return NULL;
409
410 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
411
412 /* make sure mandatory rates are always added */
413 sta->sta.supp_rates[band] = supp_rates |
414 ieee80211_mandatory_rates(local, band);
415
416 rate_control_rate_init(sta);
417
418 if (sta_info_insert(sta))
419 return NULL;
420
421 return sta;
422 }
423
424 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
425 {
426 struct ieee80211_local *local = sdata->local;
427 int active = 0;
428 struct sta_info *sta;
429
430 rcu_read_lock();
431
432 list_for_each_entry_rcu(sta, &local->sta_list, list) {
433 if (sta->sdata == sdata &&
434 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
435 jiffies)) {
436 active++;
437 break;
438 }
439 }
440
441 rcu_read_unlock();
442
443 return active;
444 }
445
446
447 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
448 {
449 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
450
451 mod_timer(&ifibss->timer,
452 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
453
454 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
455
456 if (ieee80211_sta_active_ibss(sdata))
457 return;
458
459 if (ifibss->fixed_channel)
460 return;
461
462 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
463 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
464
465 ieee80211_request_internal_scan(sdata, ifibss->ssid, ifibss->ssid_len);
466 }
467
468 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
469 {
470 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
471 struct ieee80211_local *local = sdata->local;
472 struct ieee80211_supported_band *sband;
473 u8 bssid[ETH_ALEN];
474 u16 capability;
475 int i;
476
477 if (ifibss->fixed_bssid) {
478 memcpy(bssid, ifibss->bssid, ETH_ALEN);
479 } else {
480 /* Generate random, not broadcast, locally administered BSSID. Mix in
481 * own MAC address to make sure that devices that do not have proper
482 * random number generator get different BSSID. */
483 get_random_bytes(bssid, ETH_ALEN);
484 for (i = 0; i < ETH_ALEN; i++)
485 bssid[i] ^= sdata->dev->dev_addr[i];
486 bssid[0] &= ~0x01;
487 bssid[0] |= 0x02;
488 }
489
490 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
491 sdata->dev->name, bssid);
492
493 sband = local->hw.wiphy->bands[ifibss->channel->band];
494
495 capability = WLAN_CAPABILITY_IBSS;
496
497 if (ifibss->privacy)
498 capability |= WLAN_CAPABILITY_PRIVACY;
499 else
500 sdata->drop_unencrypted = 0;
501
502 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
503 ifibss->channel, 3, /* first two are basic */
504 capability, 0);
505 }
506
507 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
508 {
509 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
510 struct ieee80211_local *local = sdata->local;
511 struct ieee80211_bss *bss;
512 struct ieee80211_channel *chan = NULL;
513 const u8 *bssid = NULL;
514 int active_ibss;
515 u16 capability;
516
517 active_ibss = ieee80211_sta_active_ibss(sdata);
518 #ifdef CONFIG_MAC80211_IBSS_DEBUG
519 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
520 sdata->dev->name, active_ibss);
521 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
522
523 if (active_ibss)
524 return;
525
526 capability = WLAN_CAPABILITY_IBSS;
527 if (ifibss->privacy)
528 capability |= WLAN_CAPABILITY_PRIVACY;
529 if (ifibss->fixed_bssid)
530 bssid = ifibss->bssid;
531 if (ifibss->fixed_channel)
532 chan = ifibss->channel;
533 if (!is_zero_ether_addr(ifibss->bssid))
534 bssid = ifibss->bssid;
535 bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan, bssid,
536 ifibss->ssid, ifibss->ssid_len,
537 WLAN_CAPABILITY_IBSS |
538 WLAN_CAPABILITY_PRIVACY,
539 capability);
540
541 #ifdef CONFIG_MAC80211_IBSS_DEBUG
542 if (bss)
543 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
544 "%pM\n", bss->cbss.bssid, ifibss->bssid);
545 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
546
547 if (bss && memcmp(ifibss->bssid, bss->cbss.bssid, ETH_ALEN)) {
548 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
549 " based on configured SSID\n",
550 sdata->dev->name, bss->cbss.bssid);
551
552 ieee80211_sta_join_ibss(sdata, bss);
553 ieee80211_rx_bss_put(local, bss);
554 return;
555 } else if (bss)
556 ieee80211_rx_bss_put(local, bss);
557
558 #ifdef CONFIG_MAC80211_IBSS_DEBUG
559 printk(KERN_DEBUG " did not try to join ibss\n");
560 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
561
562 /* Selected IBSS not found in current scan results - try to scan */
563 if (ifibss->state == IEEE80211_IBSS_MLME_JOINED &&
564 !ieee80211_sta_active_ibss(sdata)) {
565 mod_timer(&ifibss->timer,
566 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
567 } else if (time_after(jiffies, ifibss->last_scan_completed +
568 IEEE80211_SCAN_INTERVAL)) {
569 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
570 "join\n", sdata->dev->name);
571
572 ieee80211_request_internal_scan(sdata, ifibss->ssid,
573 ifibss->ssid_len);
574 } else if (ifibss->state != IEEE80211_IBSS_MLME_JOINED) {
575 int interval = IEEE80211_SCAN_INTERVAL;
576
577 if (time_after(jiffies, ifibss->ibss_join_req +
578 IEEE80211_IBSS_JOIN_TIMEOUT)) {
579 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
580 ieee80211_sta_create_ibss(sdata);
581 return;
582 }
583 printk(KERN_DEBUG "%s: IBSS not allowed on"
584 " %d MHz\n", sdata->dev->name,
585 local->hw.conf.channel->center_freq);
586
587 /* No IBSS found - decrease scan interval and continue
588 * scanning. */
589 interval = IEEE80211_SCAN_INTERVAL_SLOW;
590 }
591
592 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
593 mod_timer(&ifibss->timer,
594 round_jiffies(jiffies + interval));
595 }
596 }
597
598 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
599 struct ieee80211_mgmt *mgmt,
600 size_t len)
601 {
602 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
603 struct ieee80211_local *local = sdata->local;
604 int tx_last_beacon;
605 struct sk_buff *skb;
606 struct ieee80211_mgmt *resp;
607 u8 *pos, *end;
608
609 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
610 len < 24 + 2 || !ifibss->presp)
611 return;
612
613 tx_last_beacon = drv_tx_last_beacon(local);
614
615 #ifdef CONFIG_MAC80211_IBSS_DEBUG
616 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
617 " (tx_last_beacon=%d)\n",
618 sdata->dev->name, mgmt->sa, mgmt->da,
619 mgmt->bssid, tx_last_beacon);
620 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
621
622 if (!tx_last_beacon)
623 return;
624
625 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
626 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
627 return;
628
629 end = ((u8 *) mgmt) + len;
630 pos = mgmt->u.probe_req.variable;
631 if (pos[0] != WLAN_EID_SSID ||
632 pos + 2 + pos[1] > end) {
633 #ifdef CONFIG_MAC80211_IBSS_DEBUG
634 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
635 "from %pM\n",
636 sdata->dev->name, mgmt->sa);
637 #endif
638 return;
639 }
640 if (pos[1] != 0 &&
641 (pos[1] != ifibss->ssid_len ||
642 !memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
643 /* Ignore ProbeReq for foreign SSID */
644 return;
645 }
646
647 /* Reply with ProbeResp */
648 skb = skb_copy(ifibss->presp, GFP_KERNEL);
649 if (!skb)
650 return;
651
652 resp = (struct ieee80211_mgmt *) skb->data;
653 memcpy(resp->da, mgmt->sa, ETH_ALEN);
654 #ifdef CONFIG_MAC80211_IBSS_DEBUG
655 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
656 sdata->dev->name, resp->da);
657 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
658 ieee80211_tx_skb(sdata, skb, 0);
659 }
660
661 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
662 struct ieee80211_mgmt *mgmt,
663 size_t len,
664 struct ieee80211_rx_status *rx_status)
665 {
666 size_t baselen;
667 struct ieee802_11_elems elems;
668
669 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
670 return; /* ignore ProbeResp to foreign address */
671
672 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
673 if (baselen > len)
674 return;
675
676 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
677 &elems);
678
679 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
680 }
681
682 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
683 struct ieee80211_mgmt *mgmt,
684 size_t len,
685 struct ieee80211_rx_status *rx_status)
686 {
687 size_t baselen;
688 struct ieee802_11_elems elems;
689
690 /* Process beacon from the current BSS */
691 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
692 if (baselen > len)
693 return;
694
695 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
696
697 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
698 }
699
700 static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
701 struct sk_buff *skb)
702 {
703 struct ieee80211_rx_status *rx_status;
704 struct ieee80211_mgmt *mgmt;
705 u16 fc;
706
707 rx_status = IEEE80211_SKB_RXCB(skb);
708 mgmt = (struct ieee80211_mgmt *) skb->data;
709 fc = le16_to_cpu(mgmt->frame_control);
710
711 switch (fc & IEEE80211_FCTL_STYPE) {
712 case IEEE80211_STYPE_PROBE_REQ:
713 ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len);
714 break;
715 case IEEE80211_STYPE_PROBE_RESP:
716 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
717 rx_status);
718 break;
719 case IEEE80211_STYPE_BEACON:
720 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
721 rx_status);
722 break;
723 case IEEE80211_STYPE_AUTH:
724 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
725 break;
726 }
727
728 kfree_skb(skb);
729 }
730
731 static void ieee80211_ibss_work(struct work_struct *work)
732 {
733 struct ieee80211_sub_if_data *sdata =
734 container_of(work, struct ieee80211_sub_if_data, u.ibss.work);
735 struct ieee80211_local *local = sdata->local;
736 struct ieee80211_if_ibss *ifibss;
737 struct sk_buff *skb;
738
739 if (WARN_ON(local->suspended))
740 return;
741
742 if (!netif_running(sdata->dev))
743 return;
744
745 if (local->scanning)
746 return;
747
748 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC))
749 return;
750 ifibss = &sdata->u.ibss;
751
752 while ((skb = skb_dequeue(&ifibss->skb_queue)))
753 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
754
755 if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request))
756 return;
757
758 switch (ifibss->state) {
759 case IEEE80211_IBSS_MLME_SEARCH:
760 ieee80211_sta_find_ibss(sdata);
761 break;
762 case IEEE80211_IBSS_MLME_JOINED:
763 ieee80211_sta_merge_ibss(sdata);
764 break;
765 default:
766 WARN_ON(1);
767 break;
768 }
769 }
770
771 static void ieee80211_ibss_timer(unsigned long data)
772 {
773 struct ieee80211_sub_if_data *sdata =
774 (struct ieee80211_sub_if_data *) data;
775 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
776 struct ieee80211_local *local = sdata->local;
777
778 if (local->quiescing) {
779 ifibss->timer_running = true;
780 return;
781 }
782
783 set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request);
784 queue_work(local->hw.workqueue, &ifibss->work);
785 }
786
787 #ifdef CONFIG_PM
788 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
789 {
790 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
791
792 cancel_work_sync(&ifibss->work);
793 if (del_timer_sync(&ifibss->timer))
794 ifibss->timer_running = true;
795 }
796
797 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
798 {
799 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
800
801 if (ifibss->timer_running) {
802 add_timer(&ifibss->timer);
803 ifibss->timer_running = false;
804 }
805 }
806 #endif
807
808 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
809 {
810 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
811
812 INIT_WORK(&ifibss->work, ieee80211_ibss_work);
813 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
814 (unsigned long) sdata);
815 skb_queue_head_init(&ifibss->skb_queue);
816 }
817
818 /* scan finished notification */
819 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
820 {
821 struct ieee80211_sub_if_data *sdata;
822
823 mutex_lock(&local->iflist_mtx);
824 list_for_each_entry(sdata, &local->interfaces, list) {
825 if (!netif_running(sdata->dev))
826 continue;
827 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
828 continue;
829 if (!sdata->u.ibss.ssid_len)
830 continue;
831 sdata->u.ibss.last_scan_completed = jiffies;
832 ieee80211_sta_find_ibss(sdata);
833 }
834 mutex_unlock(&local->iflist_mtx);
835 }
836
837 ieee80211_rx_result
838 ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
839 {
840 struct ieee80211_local *local = sdata->local;
841 struct ieee80211_mgmt *mgmt;
842 u16 fc;
843
844 if (skb->len < 24)
845 return RX_DROP_MONITOR;
846
847 mgmt = (struct ieee80211_mgmt *) skb->data;
848 fc = le16_to_cpu(mgmt->frame_control);
849
850 switch (fc & IEEE80211_FCTL_STYPE) {
851 case IEEE80211_STYPE_PROBE_RESP:
852 case IEEE80211_STYPE_BEACON:
853 case IEEE80211_STYPE_PROBE_REQ:
854 case IEEE80211_STYPE_AUTH:
855 skb_queue_tail(&sdata->u.ibss.skb_queue, skb);
856 queue_work(local->hw.workqueue, &sdata->u.ibss.work);
857 return RX_QUEUED;
858 }
859
860 return RX_DROP_MONITOR;
861 }
862
863 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
864 struct cfg80211_ibss_params *params)
865 {
866 struct sk_buff *skb;
867
868 if (params->bssid) {
869 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
870 sdata->u.ibss.fixed_bssid = true;
871 } else
872 sdata->u.ibss.fixed_bssid = false;
873
874 sdata->u.ibss.privacy = params->privacy;
875
876 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
877
878 sdata->u.ibss.channel = params->channel;
879 sdata->u.ibss.fixed_channel = params->channel_fixed;
880
881 if (params->ie) {
882 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
883 GFP_KERNEL);
884 if (sdata->u.ibss.ie)
885 sdata->u.ibss.ie_len = params->ie_len;
886 }
887
888 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
889 36 /* bitrates */ +
890 34 /* SSID */ +
891 3 /* DS params */ +
892 4 /* IBSS params */ +
893 params->ie_len);
894 if (!skb)
895 return -ENOMEM;
896
897 sdata->u.ibss.skb = skb;
898 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
899 sdata->u.ibss.ibss_join_req = jiffies;
900
901 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
902
903 /*
904 * The ssid_len setting below is used to see whether
905 * we are active, and we need all other settings
906 * before that may get visible.
907 */
908 mb();
909
910 sdata->u.ibss.ssid_len = params->ssid_len;
911
912 ieee80211_recalc_idle(sdata->local);
913
914 set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
915 queue_work(sdata->local->hw.workqueue, &sdata->u.ibss.work);
916
917 return 0;
918 }
919
920 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
921 {
922 struct sk_buff *skb;
923
924 del_timer_sync(&sdata->u.ibss.timer);
925 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
926 cancel_work_sync(&sdata->u.ibss.work);
927 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
928
929 sta_info_flush(sdata->local, sdata);
930
931 /* remove beacon */
932 kfree(sdata->u.ibss.ie);
933 skb = sdata->u.ibss.presp;
934 rcu_assign_pointer(sdata->u.ibss.presp, NULL);
935 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
936 synchronize_rcu();
937 kfree_skb(skb);
938
939 skb_queue_purge(&sdata->u.ibss.skb_queue);
940 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
941 sdata->u.ibss.ssid_len = 0;
942
943 ieee80211_recalc_idle(sdata->local);
944
945 return 0;
946 }