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Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
[deliverable/linux.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/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
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_IBSS_JOIN_TIMEOUT (7 * HZ)
30
31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
33 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
34
35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
36
37 static struct beacon_data *
38 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
39 const int beacon_int, const u32 basic_rates,
40 const u16 capability, u64 tsf,
41 struct cfg80211_chan_def *chandef,
42 bool *have_higher_than_11mbit,
43 struct cfg80211_csa_settings *csa_settings)
44 {
45 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
46 struct ieee80211_local *local = sdata->local;
47 int rates_n = 0, i, ri;
48 struct ieee80211_mgmt *mgmt;
49 u8 *pos;
50 struct ieee80211_supported_band *sband;
51 u32 rate_flags, rates = 0, rates_added = 0;
52 struct beacon_data *presp;
53 int frame_len;
54 int shift;
55
56 /* Build IBSS probe response */
57 frame_len = sizeof(struct ieee80211_hdr_3addr) +
58 12 /* struct ieee80211_mgmt.u.beacon */ +
59 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
60 2 + 8 /* max Supported Rates */ +
61 3 /* max DS params */ +
62 4 /* IBSS params */ +
63 5 /* Channel Switch Announcement */ +
64 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
65 2 + sizeof(struct ieee80211_ht_cap) +
66 2 + sizeof(struct ieee80211_ht_operation) +
67 ifibss->ie_len;
68 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
69 if (!presp)
70 return NULL;
71
72 presp->head = (void *)(presp + 1);
73
74 mgmt = (void *) presp->head;
75 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
76 IEEE80211_STYPE_PROBE_RESP);
77 eth_broadcast_addr(mgmt->da);
78 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
79 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
80 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
81 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
82 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
83
84 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
85
86 *pos++ = WLAN_EID_SSID;
87 *pos++ = ifibss->ssid_len;
88 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
89 pos += ifibss->ssid_len;
90
91 sband = local->hw.wiphy->bands[chandef->chan->band];
92 rate_flags = ieee80211_chandef_rate_flags(chandef);
93 shift = ieee80211_chandef_get_shift(chandef);
94 rates_n = 0;
95 if (have_higher_than_11mbit)
96 *have_higher_than_11mbit = false;
97
98 for (i = 0; i < sband->n_bitrates; i++) {
99 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
100 continue;
101 if (sband->bitrates[i].bitrate > 110 &&
102 have_higher_than_11mbit)
103 *have_higher_than_11mbit = true;
104
105 rates |= BIT(i);
106 rates_n++;
107 }
108
109 *pos++ = WLAN_EID_SUPP_RATES;
110 *pos++ = min_t(int, 8, rates_n);
111 for (ri = 0; ri < sband->n_bitrates; ri++) {
112 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
113 5 * (1 << shift));
114 u8 basic = 0;
115 if (!(rates & BIT(ri)))
116 continue;
117
118 if (basic_rates & BIT(ri))
119 basic = 0x80;
120 *pos++ = basic | (u8) rate;
121 if (++rates_added == 8) {
122 ri++; /* continue at next rate for EXT_SUPP_RATES */
123 break;
124 }
125 }
126
127 if (sband->band == IEEE80211_BAND_2GHZ) {
128 *pos++ = WLAN_EID_DS_PARAMS;
129 *pos++ = 1;
130 *pos++ = ieee80211_frequency_to_channel(
131 chandef->chan->center_freq);
132 }
133
134 *pos++ = WLAN_EID_IBSS_PARAMS;
135 *pos++ = 2;
136 /* FIX: set ATIM window based on scan results */
137 *pos++ = 0;
138 *pos++ = 0;
139
140 if (csa_settings) {
141 *pos++ = WLAN_EID_CHANNEL_SWITCH;
142 *pos++ = 3;
143 *pos++ = csa_settings->block_tx ? 1 : 0;
144 *pos++ = ieee80211_frequency_to_channel(
145 csa_settings->chandef.chan->center_freq);
146 presp->csa_counter_offsets[0] = (pos - presp->head);
147 *pos++ = csa_settings->count;
148 }
149
150 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
151 if (rates_n > 8) {
152 *pos++ = WLAN_EID_EXT_SUPP_RATES;
153 *pos++ = rates_n - 8;
154 for (; ri < sband->n_bitrates; ri++) {
155 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
156 5 * (1 << shift));
157 u8 basic = 0;
158 if (!(rates & BIT(ri)))
159 continue;
160
161 if (basic_rates & BIT(ri))
162 basic = 0x80;
163 *pos++ = basic | (u8) rate;
164 }
165 }
166
167 if (ifibss->ie_len) {
168 memcpy(pos, ifibss->ie, ifibss->ie_len);
169 pos += ifibss->ie_len;
170 }
171
172 /* add HT capability and information IEs */
173 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
174 chandef->width != NL80211_CHAN_WIDTH_5 &&
175 chandef->width != NL80211_CHAN_WIDTH_10 &&
176 sband->ht_cap.ht_supported) {
177 struct ieee80211_sta_ht_cap ht_cap;
178
179 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
180 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
181
182 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
183 /*
184 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
185 * field and RIFS Mode are reserved in IBSS mode, therefore
186 * keep them at 0
187 */
188 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
189 chandef, 0);
190 }
191
192 if (local->hw.queues >= IEEE80211_NUM_ACS)
193 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
194
195 presp->head_len = pos - presp->head;
196 if (WARN_ON(presp->head_len > frame_len))
197 goto error;
198
199 return presp;
200 error:
201 kfree(presp);
202 return NULL;
203 }
204
205 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
206 const u8 *bssid, const int beacon_int,
207 struct cfg80211_chan_def *req_chandef,
208 const u32 basic_rates,
209 const u16 capability, u64 tsf,
210 bool creator)
211 {
212 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
213 struct ieee80211_local *local = sdata->local;
214 struct ieee80211_mgmt *mgmt;
215 struct cfg80211_bss *bss;
216 u32 bss_change;
217 struct cfg80211_chan_def chandef;
218 struct ieee80211_channel *chan;
219 struct beacon_data *presp;
220 enum nl80211_bss_scan_width scan_width;
221 bool have_higher_than_11mbit;
222 bool radar_required;
223 int err;
224
225 sdata_assert_lock(sdata);
226
227 /* Reset own TSF to allow time synchronization work. */
228 drv_reset_tsf(local, sdata);
229
230 if (!ether_addr_equal(ifibss->bssid, bssid))
231 sta_info_flush(sdata);
232
233 /* if merging, indicate to driver that we leave the old IBSS */
234 if (sdata->vif.bss_conf.ibss_joined) {
235 sdata->vif.bss_conf.ibss_joined = false;
236 sdata->vif.bss_conf.ibss_creator = false;
237 sdata->vif.bss_conf.enable_beacon = false;
238 netif_carrier_off(sdata->dev);
239 ieee80211_bss_info_change_notify(sdata,
240 BSS_CHANGED_IBSS |
241 BSS_CHANGED_BEACON_ENABLED);
242 drv_leave_ibss(local, sdata);
243 }
244
245 presp = rcu_dereference_protected(ifibss->presp,
246 lockdep_is_held(&sdata->wdev.mtx));
247 RCU_INIT_POINTER(ifibss->presp, NULL);
248 if (presp)
249 kfree_rcu(presp, rcu_head);
250
251 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
252
253 /* make a copy of the chandef, it could be modified below. */
254 chandef = *req_chandef;
255 chan = chandef.chan;
256 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
257 NL80211_IFTYPE_ADHOC)) {
258 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
259 chandef.width == NL80211_CHAN_WIDTH_10 ||
260 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
261 chandef.width == NL80211_CHAN_WIDTH_20) {
262 sdata_info(sdata,
263 "Failed to join IBSS, beacons forbidden\n");
264 return;
265 }
266 chandef.width = NL80211_CHAN_WIDTH_20;
267 chandef.center_freq1 = chan->center_freq;
268 /* check again for downgraded chandef */
269 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
270 NL80211_IFTYPE_ADHOC)) {
271 sdata_info(sdata,
272 "Failed to join IBSS, beacons forbidden\n");
273 return;
274 }
275 }
276
277 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
278 &chandef, NL80211_IFTYPE_ADHOC);
279 if (err < 0) {
280 sdata_info(sdata,
281 "Failed to join IBSS, invalid chandef\n");
282 return;
283 }
284 if (err > 0 && !ifibss->userspace_handles_dfs) {
285 sdata_info(sdata,
286 "Failed to join IBSS, DFS channel without control program\n");
287 return;
288 }
289
290 radar_required = err;
291
292 mutex_lock(&local->mtx);
293 if (ieee80211_vif_use_channel(sdata, &chandef,
294 ifibss->fixed_channel ?
295 IEEE80211_CHANCTX_SHARED :
296 IEEE80211_CHANCTX_EXCLUSIVE)) {
297 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
298 mutex_unlock(&local->mtx);
299 return;
300 }
301 sdata->radar_required = radar_required;
302 mutex_unlock(&local->mtx);
303
304 memcpy(ifibss->bssid, bssid, ETH_ALEN);
305
306 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
307 capability, tsf, &chandef,
308 &have_higher_than_11mbit, NULL);
309 if (!presp)
310 return;
311
312 rcu_assign_pointer(ifibss->presp, presp);
313 mgmt = (void *)presp->head;
314
315 sdata->vif.bss_conf.enable_beacon = true;
316 sdata->vif.bss_conf.beacon_int = beacon_int;
317 sdata->vif.bss_conf.basic_rates = basic_rates;
318 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
319 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
320 bss_change = BSS_CHANGED_BEACON_INT;
321 bss_change |= ieee80211_reset_erp_info(sdata);
322 bss_change |= BSS_CHANGED_BSSID;
323 bss_change |= BSS_CHANGED_BEACON;
324 bss_change |= BSS_CHANGED_BEACON_ENABLED;
325 bss_change |= BSS_CHANGED_BASIC_RATES;
326 bss_change |= BSS_CHANGED_HT;
327 bss_change |= BSS_CHANGED_IBSS;
328 bss_change |= BSS_CHANGED_SSID;
329
330 /*
331 * In 5 GHz/802.11a, we can always use short slot time.
332 * (IEEE 802.11-2012 18.3.8.7)
333 *
334 * In 2.4GHz, we must always use long slots in IBSS for compatibility
335 * reasons.
336 * (IEEE 802.11-2012 19.4.5)
337 *
338 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
339 */
340 sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
341 bss_change |= BSS_CHANGED_ERP_SLOT;
342
343 /* cf. IEEE 802.11 9.2.12 */
344 if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
345 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
346 else
347 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
348
349 ieee80211_set_wmm_default(sdata, true);
350
351 sdata->vif.bss_conf.ibss_joined = true;
352 sdata->vif.bss_conf.ibss_creator = creator;
353
354 err = drv_join_ibss(local, sdata);
355 if (err) {
356 sdata->vif.bss_conf.ibss_joined = false;
357 sdata->vif.bss_conf.ibss_creator = false;
358 sdata->vif.bss_conf.enable_beacon = false;
359 sdata->vif.bss_conf.ssid_len = 0;
360 RCU_INIT_POINTER(ifibss->presp, NULL);
361 kfree_rcu(presp, rcu_head);
362 mutex_lock(&local->mtx);
363 ieee80211_vif_release_channel(sdata);
364 mutex_unlock(&local->mtx);
365 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
366 err);
367 return;
368 }
369
370 ieee80211_bss_info_change_notify(sdata, bss_change);
371
372 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
373 mod_timer(&ifibss->timer,
374 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
375
376 scan_width = cfg80211_chandef_to_scan_width(&chandef);
377 bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan,
378 scan_width, mgmt,
379 presp->head_len, 0, GFP_KERNEL);
380 cfg80211_put_bss(local->hw.wiphy, bss);
381 netif_carrier_on(sdata->dev);
382 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
383 }
384
385 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
386 struct ieee80211_bss *bss)
387 {
388 struct cfg80211_bss *cbss =
389 container_of((void *)bss, struct cfg80211_bss, priv);
390 struct ieee80211_supported_band *sband;
391 struct cfg80211_chan_def chandef;
392 u32 basic_rates;
393 int i, j;
394 u16 beacon_int = cbss->beacon_interval;
395 const struct cfg80211_bss_ies *ies;
396 enum nl80211_channel_type chan_type;
397 u64 tsf;
398 u32 rate_flags;
399 int shift;
400
401 sdata_assert_lock(sdata);
402
403 if (beacon_int < 10)
404 beacon_int = 10;
405
406 switch (sdata->u.ibss.chandef.width) {
407 case NL80211_CHAN_WIDTH_20_NOHT:
408 case NL80211_CHAN_WIDTH_20:
409 case NL80211_CHAN_WIDTH_40:
410 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
411 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
412 break;
413 case NL80211_CHAN_WIDTH_5:
414 case NL80211_CHAN_WIDTH_10:
415 cfg80211_chandef_create(&chandef, cbss->channel,
416 NL80211_CHAN_WIDTH_20_NOHT);
417 chandef.width = sdata->u.ibss.chandef.width;
418 break;
419 default:
420 /* fall back to 20 MHz for unsupported modes */
421 cfg80211_chandef_create(&chandef, cbss->channel,
422 NL80211_CHAN_WIDTH_20_NOHT);
423 break;
424 }
425
426 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
427 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
428 shift = ieee80211_vif_get_shift(&sdata->vif);
429
430 basic_rates = 0;
431
432 for (i = 0; i < bss->supp_rates_len; i++) {
433 int rate = bss->supp_rates[i] & 0x7f;
434 bool is_basic = !!(bss->supp_rates[i] & 0x80);
435
436 for (j = 0; j < sband->n_bitrates; j++) {
437 int brate;
438 if ((rate_flags & sband->bitrates[j].flags)
439 != rate_flags)
440 continue;
441
442 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
443 5 * (1 << shift));
444 if (brate == rate) {
445 if (is_basic)
446 basic_rates |= BIT(j);
447 break;
448 }
449 }
450 }
451
452 rcu_read_lock();
453 ies = rcu_dereference(cbss->ies);
454 tsf = ies->tsf;
455 rcu_read_unlock();
456
457 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
458 beacon_int,
459 &chandef,
460 basic_rates,
461 cbss->capability,
462 tsf, false);
463 }
464
465 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
466 struct cfg80211_csa_settings *csa_settings)
467 {
468 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
469 struct beacon_data *presp, *old_presp;
470 struct cfg80211_bss *cbss;
471 const struct cfg80211_bss_ies *ies;
472 u16 capability;
473 u64 tsf;
474 int ret = 0;
475
476 sdata_assert_lock(sdata);
477
478 capability = WLAN_CAPABILITY_IBSS;
479
480 if (ifibss->privacy)
481 capability |= WLAN_CAPABILITY_PRIVACY;
482
483 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
484 ifibss->bssid, ifibss->ssid,
485 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
486 WLAN_CAPABILITY_PRIVACY,
487 capability);
488
489 if (WARN_ON(!cbss)) {
490 ret = -EINVAL;
491 goto out;
492 }
493
494 rcu_read_lock();
495 ies = rcu_dereference(cbss->ies);
496 tsf = ies->tsf;
497 rcu_read_unlock();
498 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
499
500 old_presp = rcu_dereference_protected(ifibss->presp,
501 lockdep_is_held(&sdata->wdev.mtx));
502
503 presp = ieee80211_ibss_build_presp(sdata,
504 sdata->vif.bss_conf.beacon_int,
505 sdata->vif.bss_conf.basic_rates,
506 capability, tsf, &ifibss->chandef,
507 NULL, csa_settings);
508 if (!presp) {
509 ret = -ENOMEM;
510 goto out;
511 }
512
513 rcu_assign_pointer(ifibss->presp, presp);
514 if (old_presp)
515 kfree_rcu(old_presp, rcu_head);
516
517 return BSS_CHANGED_BEACON;
518 out:
519 return ret;
520 }
521
522 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
523 {
524 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
525 struct cfg80211_bss *cbss;
526 int err, changed = 0;
527 u16 capability;
528
529 sdata_assert_lock(sdata);
530
531 /* update cfg80211 bss information with the new channel */
532 if (!is_zero_ether_addr(ifibss->bssid)) {
533 capability = WLAN_CAPABILITY_IBSS;
534
535 if (ifibss->privacy)
536 capability |= WLAN_CAPABILITY_PRIVACY;
537
538 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
539 ifibss->chandef.chan,
540 ifibss->bssid, ifibss->ssid,
541 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
542 WLAN_CAPABILITY_PRIVACY,
543 capability);
544 /* XXX: should not really modify cfg80211 data */
545 if (cbss) {
546 cbss->channel = sdata->csa_chandef.chan;
547 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
548 }
549 }
550
551 ifibss->chandef = sdata->csa_chandef;
552
553 /* generate the beacon */
554 err = ieee80211_ibss_csa_beacon(sdata, NULL);
555 if (err < 0)
556 return err;
557
558 changed |= err;
559
560 return changed;
561 }
562
563 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
564 {
565 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
566
567 cancel_work_sync(&ifibss->csa_connection_drop_work);
568 }
569
570 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
571 __acquires(RCU)
572 {
573 struct ieee80211_sub_if_data *sdata = sta->sdata;
574 u8 addr[ETH_ALEN];
575
576 memcpy(addr, sta->sta.addr, ETH_ALEN);
577
578 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
579
580 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
581 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
582 /* authorize the station only if the network is not RSN protected. If
583 * not wait for the userspace to authorize it */
584 if (!sta->sdata->u.ibss.control_port)
585 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
586
587 rate_control_rate_init(sta);
588
589 /* If it fails, maybe we raced another insertion? */
590 if (sta_info_insert_rcu(sta))
591 return sta_info_get(sdata, addr);
592 return sta;
593 }
594
595 static struct sta_info *
596 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
597 const u8 *addr, u32 supp_rates)
598 __acquires(RCU)
599 {
600 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
601 struct ieee80211_local *local = sdata->local;
602 struct sta_info *sta;
603 struct ieee80211_chanctx_conf *chanctx_conf;
604 struct ieee80211_supported_band *sband;
605 enum nl80211_bss_scan_width scan_width;
606 int band;
607
608 /*
609 * XXX: Consider removing the least recently used entry and
610 * allow new one to be added.
611 */
612 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
613 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
614 sdata->name, addr);
615 rcu_read_lock();
616 return NULL;
617 }
618
619 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
620 rcu_read_lock();
621 return NULL;
622 }
623
624 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
625 rcu_read_lock();
626 return NULL;
627 }
628
629 rcu_read_lock();
630 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
631 if (WARN_ON_ONCE(!chanctx_conf))
632 return NULL;
633 band = chanctx_conf->def.chan->band;
634 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
635 rcu_read_unlock();
636
637 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
638 if (!sta) {
639 rcu_read_lock();
640 return NULL;
641 }
642
643 sta->last_rx = jiffies;
644
645 /* make sure mandatory rates are always added */
646 sband = local->hw.wiphy->bands[band];
647 sta->sta.supp_rates[band] = supp_rates |
648 ieee80211_mandatory_rates(sband, scan_width);
649
650 return ieee80211_ibss_finish_sta(sta);
651 }
652
653 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
654 {
655 struct ieee80211_local *local = sdata->local;
656 int active = 0;
657 struct sta_info *sta;
658
659 sdata_assert_lock(sdata);
660
661 rcu_read_lock();
662
663 list_for_each_entry_rcu(sta, &local->sta_list, list) {
664 if (sta->sdata == sdata &&
665 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
666 jiffies)) {
667 active++;
668 break;
669 }
670 }
671
672 rcu_read_unlock();
673
674 return active;
675 }
676
677 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
678 {
679 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
680 struct ieee80211_local *local = sdata->local;
681 struct cfg80211_bss *cbss;
682 struct beacon_data *presp;
683 struct sta_info *sta;
684 u16 capability;
685
686 if (!is_zero_ether_addr(ifibss->bssid)) {
687 capability = WLAN_CAPABILITY_IBSS;
688
689 if (ifibss->privacy)
690 capability |= WLAN_CAPABILITY_PRIVACY;
691
692 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
693 ifibss->bssid, ifibss->ssid,
694 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
695 WLAN_CAPABILITY_PRIVACY,
696 capability);
697
698 if (cbss) {
699 cfg80211_unlink_bss(local->hw.wiphy, cbss);
700 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
701 }
702 }
703
704 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
705
706 sta_info_flush(sdata);
707
708 spin_lock_bh(&ifibss->incomplete_lock);
709 while (!list_empty(&ifibss->incomplete_stations)) {
710 sta = list_first_entry(&ifibss->incomplete_stations,
711 struct sta_info, list);
712 list_del(&sta->list);
713 spin_unlock_bh(&ifibss->incomplete_lock);
714
715 sta_info_free(local, sta);
716 spin_lock_bh(&ifibss->incomplete_lock);
717 }
718 spin_unlock_bh(&ifibss->incomplete_lock);
719
720 netif_carrier_off(sdata->dev);
721
722 sdata->vif.bss_conf.ibss_joined = false;
723 sdata->vif.bss_conf.ibss_creator = false;
724 sdata->vif.bss_conf.enable_beacon = false;
725 sdata->vif.bss_conf.ssid_len = 0;
726
727 /* remove beacon */
728 presp = rcu_dereference_protected(ifibss->presp,
729 lockdep_is_held(&sdata->wdev.mtx));
730 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
731 if (presp)
732 kfree_rcu(presp, rcu_head);
733
734 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
735 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
736 BSS_CHANGED_IBSS);
737 drv_leave_ibss(local, sdata);
738 mutex_lock(&local->mtx);
739 ieee80211_vif_release_channel(sdata);
740 mutex_unlock(&local->mtx);
741 }
742
743 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
744 {
745 struct ieee80211_sub_if_data *sdata =
746 container_of(work, struct ieee80211_sub_if_data,
747 u.ibss.csa_connection_drop_work);
748
749 sdata_lock(sdata);
750
751 ieee80211_ibss_disconnect(sdata);
752 synchronize_rcu();
753 skb_queue_purge(&sdata->skb_queue);
754
755 /* trigger a scan to find another IBSS network to join */
756 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
757
758 sdata_unlock(sdata);
759 }
760
761 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
762 {
763 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
764 int err;
765
766 /* if the current channel is a DFS channel, mark the channel as
767 * unavailable.
768 */
769 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
770 &ifibss->chandef,
771 NL80211_IFTYPE_ADHOC);
772 if (err > 0)
773 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
774 GFP_ATOMIC);
775 }
776
777 static bool
778 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
779 struct ieee802_11_elems *elems,
780 bool beacon)
781 {
782 struct cfg80211_csa_settings params;
783 struct ieee80211_csa_ie csa_ie;
784 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
785 enum nl80211_channel_type ch_type;
786 int err;
787 u32 sta_flags;
788
789 sdata_assert_lock(sdata);
790
791 sta_flags = IEEE80211_STA_DISABLE_VHT;
792 switch (ifibss->chandef.width) {
793 case NL80211_CHAN_WIDTH_5:
794 case NL80211_CHAN_WIDTH_10:
795 case NL80211_CHAN_WIDTH_20_NOHT:
796 sta_flags |= IEEE80211_STA_DISABLE_HT;
797 /* fall through */
798 case NL80211_CHAN_WIDTH_20:
799 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
800 break;
801 default:
802 break;
803 }
804
805 memset(&params, 0, sizeof(params));
806 memset(&csa_ie, 0, sizeof(csa_ie));
807 err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon,
808 ifibss->chandef.chan->band,
809 sta_flags, ifibss->bssid, &csa_ie);
810 /* can't switch to destination channel, fail */
811 if (err < 0)
812 goto disconnect;
813
814 /* did not contain a CSA */
815 if (err)
816 return false;
817
818 /* channel switch is not supported, disconnect */
819 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
820 goto disconnect;
821
822 params.count = csa_ie.count;
823 params.chandef = csa_ie.chandef;
824
825 switch (ifibss->chandef.width) {
826 case NL80211_CHAN_WIDTH_20_NOHT:
827 case NL80211_CHAN_WIDTH_20:
828 case NL80211_CHAN_WIDTH_40:
829 /* keep our current HT mode (HT20/HT40+/HT40-), even if
830 * another mode has been announced. The mode is not adopted
831 * within the beacon while doing CSA and we should therefore
832 * keep the mode which we announce.
833 */
834 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
835 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
836 ch_type);
837 break;
838 case NL80211_CHAN_WIDTH_5:
839 case NL80211_CHAN_WIDTH_10:
840 if (params.chandef.width != ifibss->chandef.width) {
841 sdata_info(sdata,
842 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
843 ifibss->bssid,
844 params.chandef.chan->center_freq,
845 params.chandef.width,
846 params.chandef.center_freq1,
847 params.chandef.center_freq2);
848 goto disconnect;
849 }
850 break;
851 default:
852 /* should not happen, sta_flags should prevent VHT modes. */
853 WARN_ON(1);
854 goto disconnect;
855 }
856
857 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
858 NL80211_IFTYPE_ADHOC)) {
859 sdata_info(sdata,
860 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
861 ifibss->bssid,
862 params.chandef.chan->center_freq,
863 params.chandef.width,
864 params.chandef.center_freq1,
865 params.chandef.center_freq2);
866 goto disconnect;
867 }
868
869 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
870 &params.chandef,
871 NL80211_IFTYPE_ADHOC);
872 if (err < 0)
873 goto disconnect;
874 if (err > 0 && !ifibss->userspace_handles_dfs) {
875 /* IBSS-DFS only allowed with a control program */
876 goto disconnect;
877 }
878
879 params.radar_required = err;
880
881 if (cfg80211_chandef_identical(&params.chandef,
882 &sdata->vif.bss_conf.chandef)) {
883 ibss_dbg(sdata,
884 "received csa with an identical chandef, ignoring\n");
885 return true;
886 }
887
888 /* all checks done, now perform the channel switch. */
889 ibss_dbg(sdata,
890 "received channel switch announcement to go to channel %d MHz\n",
891 params.chandef.chan->center_freq);
892
893 params.block_tx = !!csa_ie.mode;
894
895 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
896 &params))
897 goto disconnect;
898
899 ieee80211_ibss_csa_mark_radar(sdata);
900
901 return true;
902 disconnect:
903 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
904 ieee80211_queue_work(&sdata->local->hw,
905 &ifibss->csa_connection_drop_work);
906
907 ieee80211_ibss_csa_mark_radar(sdata);
908
909 return true;
910 }
911
912 static void
913 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
914 struct ieee80211_mgmt *mgmt, size_t len,
915 struct ieee80211_rx_status *rx_status,
916 struct ieee802_11_elems *elems)
917 {
918 int required_len;
919
920 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
921 return;
922
923 /* CSA is the only action we handle for now */
924 if (mgmt->u.action.u.measurement.action_code !=
925 WLAN_ACTION_SPCT_CHL_SWITCH)
926 return;
927
928 required_len = IEEE80211_MIN_ACTION_SIZE +
929 sizeof(mgmt->u.action.u.chan_switch);
930 if (len < required_len)
931 return;
932
933 if (!sdata->vif.csa_active)
934 ieee80211_ibss_process_chanswitch(sdata, elems, false);
935 }
936
937 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
938 struct ieee80211_mgmt *mgmt,
939 size_t len)
940 {
941 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
942
943 if (len < IEEE80211_DEAUTH_FRAME_LEN)
944 return;
945
946 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
947 mgmt->sa, mgmt->da, mgmt->bssid, reason);
948 sta_info_destroy_addr(sdata, mgmt->sa);
949 }
950
951 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
952 struct ieee80211_mgmt *mgmt,
953 size_t len)
954 {
955 u16 auth_alg, auth_transaction;
956
957 sdata_assert_lock(sdata);
958
959 if (len < 24 + 6)
960 return;
961
962 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
963 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
964
965 ibss_dbg(sdata,
966 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
967 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
968
969 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
970 return;
971
972 /*
973 * IEEE 802.11 standard does not require authentication in IBSS
974 * networks and most implementations do not seem to use it.
975 * However, try to reply to authentication attempts if someone
976 * has actually implemented this.
977 */
978 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
979 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
980 }
981
982 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
983 struct ieee80211_mgmt *mgmt, size_t len,
984 struct ieee80211_rx_status *rx_status,
985 struct ieee802_11_elems *elems)
986 {
987 struct ieee80211_local *local = sdata->local;
988 struct cfg80211_bss *cbss;
989 struct ieee80211_bss *bss;
990 struct sta_info *sta;
991 struct ieee80211_channel *channel;
992 u64 beacon_timestamp, rx_timestamp;
993 u32 supp_rates = 0;
994 enum ieee80211_band band = rx_status->band;
995 enum nl80211_bss_scan_width scan_width;
996 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
997 bool rates_updated = false;
998
999 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1000 if (!channel)
1001 return;
1002
1003 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1004 ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
1005
1006 rcu_read_lock();
1007 sta = sta_info_get(sdata, mgmt->sa);
1008
1009 if (elems->supp_rates) {
1010 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1011 band, NULL);
1012 if (sta) {
1013 u32 prev_rates;
1014
1015 prev_rates = sta->sta.supp_rates[band];
1016 /* make sure mandatory rates are always added */
1017 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1018 if (rx_status->flag & RX_FLAG_5MHZ)
1019 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1020 if (rx_status->flag & RX_FLAG_10MHZ)
1021 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1022
1023 sta->sta.supp_rates[band] = supp_rates |
1024 ieee80211_mandatory_rates(sband,
1025 scan_width);
1026 if (sta->sta.supp_rates[band] != prev_rates) {
1027 ibss_dbg(sdata,
1028 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1029 sta->sta.addr, prev_rates,
1030 sta->sta.supp_rates[band]);
1031 rates_updated = true;
1032 }
1033 } else {
1034 rcu_read_unlock();
1035 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1036 mgmt->sa, supp_rates);
1037 }
1038 }
1039
1040 if (sta && elems->wmm_info)
1041 set_sta_flag(sta, WLAN_STA_WME);
1042
1043 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1044 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1045 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1046 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1047 /* we both use HT */
1048 struct ieee80211_ht_cap htcap_ie;
1049 struct cfg80211_chan_def chandef;
1050
1051 ieee80211_ht_oper_to_chandef(channel,
1052 elems->ht_operation,
1053 &chandef);
1054
1055 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1056
1057 /*
1058 * fall back to HT20 if we don't use or use
1059 * the other extension channel
1060 */
1061 if (chandef.center_freq1 !=
1062 sdata->u.ibss.chandef.center_freq1)
1063 htcap_ie.cap_info &=
1064 cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
1065
1066 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
1067 sdata, sband, &htcap_ie, sta);
1068 }
1069
1070 if (sta && rates_updated) {
1071 drv_sta_rc_update(local, sdata, &sta->sta,
1072 IEEE80211_RC_SUPP_RATES_CHANGED);
1073 rate_control_rate_init(sta);
1074 }
1075
1076 rcu_read_unlock();
1077 }
1078
1079 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1080 channel);
1081 if (!bss)
1082 return;
1083
1084 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1085
1086 /* same for beacon and probe response */
1087 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1088
1089 /* check if we need to merge IBSS */
1090
1091 /* not an IBSS */
1092 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1093 goto put_bss;
1094
1095 /* different channel */
1096 if (sdata->u.ibss.fixed_channel &&
1097 sdata->u.ibss.chandef.chan != cbss->channel)
1098 goto put_bss;
1099
1100 /* different SSID */
1101 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1102 memcmp(elems->ssid, sdata->u.ibss.ssid,
1103 sdata->u.ibss.ssid_len))
1104 goto put_bss;
1105
1106 /* process channel switch */
1107 if (sdata->vif.csa_active ||
1108 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1109 goto put_bss;
1110
1111 /* same BSSID */
1112 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1113 goto put_bss;
1114
1115 /* we use a fixed BSSID */
1116 if (sdata->u.ibss.fixed_bssid)
1117 goto put_bss;
1118
1119 if (ieee80211_have_rx_timestamp(rx_status)) {
1120 /* time when timestamp field was received */
1121 rx_timestamp =
1122 ieee80211_calculate_rx_timestamp(local, rx_status,
1123 len + FCS_LEN, 24);
1124 } else {
1125 /*
1126 * second best option: get current TSF
1127 * (will return -1 if not supported)
1128 */
1129 rx_timestamp = drv_get_tsf(local, sdata);
1130 }
1131
1132 ibss_dbg(sdata,
1133 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1134 mgmt->sa, mgmt->bssid,
1135 (unsigned long long)rx_timestamp,
1136 (unsigned long long)beacon_timestamp,
1137 (unsigned long long)(rx_timestamp - beacon_timestamp),
1138 jiffies);
1139
1140 if (beacon_timestamp > rx_timestamp) {
1141 ibss_dbg(sdata,
1142 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1143 mgmt->bssid);
1144 ieee80211_sta_join_ibss(sdata, bss);
1145 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1146 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1147 supp_rates);
1148 rcu_read_unlock();
1149 }
1150
1151 put_bss:
1152 ieee80211_rx_bss_put(local, bss);
1153 }
1154
1155 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1156 const u8 *bssid, const u8 *addr,
1157 u32 supp_rates)
1158 {
1159 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1160 struct ieee80211_local *local = sdata->local;
1161 struct sta_info *sta;
1162 struct ieee80211_chanctx_conf *chanctx_conf;
1163 struct ieee80211_supported_band *sband;
1164 enum nl80211_bss_scan_width scan_width;
1165 int band;
1166
1167 /*
1168 * XXX: Consider removing the least recently used entry and
1169 * allow new one to be added.
1170 */
1171 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1172 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1173 sdata->name, addr);
1174 return;
1175 }
1176
1177 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1178 return;
1179
1180 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1181 return;
1182
1183 rcu_read_lock();
1184 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1185 if (WARN_ON_ONCE(!chanctx_conf)) {
1186 rcu_read_unlock();
1187 return;
1188 }
1189 band = chanctx_conf->def.chan->band;
1190 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1191 rcu_read_unlock();
1192
1193 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1194 if (!sta)
1195 return;
1196
1197 sta->last_rx = jiffies;
1198
1199 /* make sure mandatory rates are always added */
1200 sband = local->hw.wiphy->bands[band];
1201 sta->sta.supp_rates[band] = supp_rates |
1202 ieee80211_mandatory_rates(sband, scan_width);
1203
1204 spin_lock(&ifibss->incomplete_lock);
1205 list_add(&sta->list, &ifibss->incomplete_stations);
1206 spin_unlock(&ifibss->incomplete_lock);
1207 ieee80211_queue_work(&local->hw, &sdata->work);
1208 }
1209
1210 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1211 {
1212 struct ieee80211_local *local = sdata->local;
1213 struct sta_info *sta, *tmp;
1214 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1215 unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1216
1217 mutex_lock(&local->sta_mtx);
1218
1219 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1220 if (sdata != sta->sdata)
1221 continue;
1222
1223 if (time_after(jiffies, sta->last_rx + exp_time) ||
1224 (time_after(jiffies, sta->last_rx + exp_rsn_time) &&
1225 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1226 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1227 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1228 "not authorized " : "", sta->sta.addr);
1229
1230 WARN_ON(__sta_info_destroy(sta));
1231 }
1232 }
1233
1234 mutex_unlock(&local->sta_mtx);
1235 }
1236
1237 /*
1238 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1239 */
1240
1241 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1242 {
1243 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1244 enum nl80211_bss_scan_width scan_width;
1245
1246 sdata_assert_lock(sdata);
1247
1248 mod_timer(&ifibss->timer,
1249 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1250
1251 ieee80211_ibss_sta_expire(sdata);
1252
1253 if (time_before(jiffies, ifibss->last_scan_completed +
1254 IEEE80211_IBSS_MERGE_INTERVAL))
1255 return;
1256
1257 if (ieee80211_sta_active_ibss(sdata))
1258 return;
1259
1260 if (ifibss->fixed_channel)
1261 return;
1262
1263 sdata_info(sdata,
1264 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1265
1266 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1267 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1268 NULL, scan_width);
1269 }
1270
1271 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1272 {
1273 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1274 u8 bssid[ETH_ALEN];
1275 u16 capability;
1276 int i;
1277
1278 sdata_assert_lock(sdata);
1279
1280 if (ifibss->fixed_bssid) {
1281 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1282 } else {
1283 /* Generate random, not broadcast, locally administered BSSID. Mix in
1284 * own MAC address to make sure that devices that do not have proper
1285 * random number generator get different BSSID. */
1286 get_random_bytes(bssid, ETH_ALEN);
1287 for (i = 0; i < ETH_ALEN; i++)
1288 bssid[i] ^= sdata->vif.addr[i];
1289 bssid[0] &= ~0x01;
1290 bssid[0] |= 0x02;
1291 }
1292
1293 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1294
1295 capability = WLAN_CAPABILITY_IBSS;
1296
1297 if (ifibss->privacy)
1298 capability |= WLAN_CAPABILITY_PRIVACY;
1299 else
1300 sdata->drop_unencrypted = 0;
1301
1302 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1303 &ifibss->chandef, ifibss->basic_rates,
1304 capability, 0, true);
1305 }
1306
1307 /*
1308 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1309 */
1310
1311 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1312 {
1313 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1314 struct ieee80211_local *local = sdata->local;
1315 struct cfg80211_bss *cbss;
1316 struct ieee80211_channel *chan = NULL;
1317 const u8 *bssid = NULL;
1318 enum nl80211_bss_scan_width scan_width;
1319 int active_ibss;
1320 u16 capability;
1321
1322 sdata_assert_lock(sdata);
1323
1324 active_ibss = ieee80211_sta_active_ibss(sdata);
1325 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1326
1327 if (active_ibss)
1328 return;
1329
1330 capability = WLAN_CAPABILITY_IBSS;
1331 if (ifibss->privacy)
1332 capability |= WLAN_CAPABILITY_PRIVACY;
1333 if (ifibss->fixed_bssid)
1334 bssid = ifibss->bssid;
1335 if (ifibss->fixed_channel)
1336 chan = ifibss->chandef.chan;
1337 if (!is_zero_ether_addr(ifibss->bssid))
1338 bssid = ifibss->bssid;
1339 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1340 ifibss->ssid, ifibss->ssid_len,
1341 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
1342 capability);
1343
1344 if (cbss) {
1345 struct ieee80211_bss *bss;
1346
1347 bss = (void *)cbss->priv;
1348 ibss_dbg(sdata,
1349 "sta_find_ibss: selected %pM current %pM\n",
1350 cbss->bssid, ifibss->bssid);
1351 sdata_info(sdata,
1352 "Selected IBSS BSSID %pM based on configured SSID\n",
1353 cbss->bssid);
1354
1355 ieee80211_sta_join_ibss(sdata, bss);
1356 ieee80211_rx_bss_put(local, bss);
1357 return;
1358 }
1359
1360 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1361 * directly and do not waste time scanning
1362 */
1363 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1364 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1365 bssid);
1366 ieee80211_sta_create_ibss(sdata);
1367 return;
1368 }
1369
1370
1371 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1372
1373 /* Selected IBSS not found in current scan results - try to scan */
1374 if (time_after(jiffies, ifibss->last_scan_completed +
1375 IEEE80211_SCAN_INTERVAL)) {
1376 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1377
1378 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1379 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1380 ifibss->ssid_len, chan,
1381 scan_width);
1382 } else {
1383 int interval = IEEE80211_SCAN_INTERVAL;
1384
1385 if (time_after(jiffies, ifibss->ibss_join_req +
1386 IEEE80211_IBSS_JOIN_TIMEOUT))
1387 ieee80211_sta_create_ibss(sdata);
1388
1389 mod_timer(&ifibss->timer,
1390 round_jiffies(jiffies + interval));
1391 }
1392 }
1393
1394 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1395 struct sk_buff *req)
1396 {
1397 struct ieee80211_mgmt *mgmt = (void *)req->data;
1398 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1399 struct ieee80211_local *local = sdata->local;
1400 int tx_last_beacon, len = req->len;
1401 struct sk_buff *skb;
1402 struct beacon_data *presp;
1403 u8 *pos, *end;
1404
1405 sdata_assert_lock(sdata);
1406
1407 presp = rcu_dereference_protected(ifibss->presp,
1408 lockdep_is_held(&sdata->wdev.mtx));
1409
1410 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1411 len < 24 + 2 || !presp)
1412 return;
1413
1414 tx_last_beacon = drv_tx_last_beacon(local);
1415
1416 ibss_dbg(sdata,
1417 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1418 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1419
1420 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1421 return;
1422
1423 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1424 !is_broadcast_ether_addr(mgmt->bssid))
1425 return;
1426
1427 end = ((u8 *) mgmt) + len;
1428 pos = mgmt->u.probe_req.variable;
1429 if (pos[0] != WLAN_EID_SSID ||
1430 pos + 2 + pos[1] > end) {
1431 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1432 mgmt->sa);
1433 return;
1434 }
1435 if (pos[1] != 0 &&
1436 (pos[1] != ifibss->ssid_len ||
1437 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1438 /* Ignore ProbeReq for foreign SSID */
1439 return;
1440 }
1441
1442 /* Reply with ProbeResp */
1443 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1444 if (!skb)
1445 return;
1446
1447 skb_reserve(skb, local->tx_headroom);
1448 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1449
1450 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1451 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1452 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1453
1454 /* avoid excessive retries for probe request to wildcard SSIDs */
1455 if (pos[1] == 0)
1456 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1457
1458 ieee80211_tx_skb(sdata, skb);
1459 }
1460
1461 static
1462 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1463 struct ieee80211_mgmt *mgmt, size_t len,
1464 struct ieee80211_rx_status *rx_status)
1465 {
1466 size_t baselen;
1467 struct ieee802_11_elems elems;
1468
1469 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1470 offsetof(typeof(mgmt->u.beacon), variable));
1471
1472 /*
1473 * either beacon or probe_resp but the variable field is at the
1474 * same offset
1475 */
1476 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1477 if (baselen > len)
1478 return;
1479
1480 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1481 false, &elems);
1482
1483 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1484 }
1485
1486 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1487 struct sk_buff *skb)
1488 {
1489 struct ieee80211_rx_status *rx_status;
1490 struct ieee80211_mgmt *mgmt;
1491 u16 fc;
1492 struct ieee802_11_elems elems;
1493 int ies_len;
1494
1495 rx_status = IEEE80211_SKB_RXCB(skb);
1496 mgmt = (struct ieee80211_mgmt *) skb->data;
1497 fc = le16_to_cpu(mgmt->frame_control);
1498
1499 sdata_lock(sdata);
1500
1501 if (!sdata->u.ibss.ssid_len)
1502 goto mgmt_out; /* not ready to merge yet */
1503
1504 switch (fc & IEEE80211_FCTL_STYPE) {
1505 case IEEE80211_STYPE_PROBE_REQ:
1506 ieee80211_rx_mgmt_probe_req(sdata, skb);
1507 break;
1508 case IEEE80211_STYPE_PROBE_RESP:
1509 case IEEE80211_STYPE_BEACON:
1510 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1511 rx_status);
1512 break;
1513 case IEEE80211_STYPE_AUTH:
1514 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1515 break;
1516 case IEEE80211_STYPE_DEAUTH:
1517 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1518 break;
1519 case IEEE80211_STYPE_ACTION:
1520 switch (mgmt->u.action.category) {
1521 case WLAN_CATEGORY_SPECTRUM_MGMT:
1522 ies_len = skb->len -
1523 offsetof(struct ieee80211_mgmt,
1524 u.action.u.chan_switch.variable);
1525
1526 if (ies_len < 0)
1527 break;
1528
1529 ieee802_11_parse_elems(
1530 mgmt->u.action.u.chan_switch.variable,
1531 ies_len, true, &elems);
1532
1533 if (elems.parse_error)
1534 break;
1535
1536 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1537 rx_status, &elems);
1538 break;
1539 }
1540 }
1541
1542 mgmt_out:
1543 sdata_unlock(sdata);
1544 }
1545
1546 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1547 {
1548 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1549 struct sta_info *sta;
1550
1551 sdata_lock(sdata);
1552
1553 /*
1554 * Work could be scheduled after scan or similar
1555 * when we aren't even joined (or trying) with a
1556 * network.
1557 */
1558 if (!ifibss->ssid_len)
1559 goto out;
1560
1561 spin_lock_bh(&ifibss->incomplete_lock);
1562 while (!list_empty(&ifibss->incomplete_stations)) {
1563 sta = list_first_entry(&ifibss->incomplete_stations,
1564 struct sta_info, list);
1565 list_del(&sta->list);
1566 spin_unlock_bh(&ifibss->incomplete_lock);
1567
1568 ieee80211_ibss_finish_sta(sta);
1569 rcu_read_unlock();
1570 spin_lock_bh(&ifibss->incomplete_lock);
1571 }
1572 spin_unlock_bh(&ifibss->incomplete_lock);
1573
1574 switch (ifibss->state) {
1575 case IEEE80211_IBSS_MLME_SEARCH:
1576 ieee80211_sta_find_ibss(sdata);
1577 break;
1578 case IEEE80211_IBSS_MLME_JOINED:
1579 ieee80211_sta_merge_ibss(sdata);
1580 break;
1581 default:
1582 WARN_ON(1);
1583 break;
1584 }
1585
1586 out:
1587 sdata_unlock(sdata);
1588 }
1589
1590 static void ieee80211_ibss_timer(unsigned long data)
1591 {
1592 struct ieee80211_sub_if_data *sdata =
1593 (struct ieee80211_sub_if_data *) data;
1594
1595 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1596 }
1597
1598 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1599 {
1600 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1601
1602 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1603 (unsigned long) sdata);
1604 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1605 spin_lock_init(&ifibss->incomplete_lock);
1606 INIT_WORK(&ifibss->csa_connection_drop_work,
1607 ieee80211_csa_connection_drop_work);
1608 }
1609
1610 /* scan finished notification */
1611 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1612 {
1613 struct ieee80211_sub_if_data *sdata;
1614
1615 mutex_lock(&local->iflist_mtx);
1616 list_for_each_entry(sdata, &local->interfaces, list) {
1617 if (!ieee80211_sdata_running(sdata))
1618 continue;
1619 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1620 continue;
1621 sdata->u.ibss.last_scan_completed = jiffies;
1622 ieee80211_queue_work(&local->hw, &sdata->work);
1623 }
1624 mutex_unlock(&local->iflist_mtx);
1625 }
1626
1627 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1628 struct cfg80211_ibss_params *params)
1629 {
1630 u32 changed = 0;
1631 u32 rate_flags;
1632 struct ieee80211_supported_band *sband;
1633 enum ieee80211_chanctx_mode chanmode;
1634 struct ieee80211_local *local = sdata->local;
1635 int radar_detect_width = 0;
1636 int i;
1637 int ret;
1638
1639 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1640 &params->chandef,
1641 sdata->wdev.iftype);
1642 if (ret < 0)
1643 return ret;
1644
1645 if (ret > 0) {
1646 if (!params->userspace_handles_dfs)
1647 return -EINVAL;
1648 radar_detect_width = BIT(params->chandef.width);
1649 }
1650
1651 chanmode = (params->channel_fixed && !ret) ?
1652 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1653
1654 mutex_lock(&local->chanctx_mtx);
1655 ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1656 radar_detect_width);
1657 mutex_unlock(&local->chanctx_mtx);
1658 if (ret < 0)
1659 return ret;
1660
1661 if (params->bssid) {
1662 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1663 sdata->u.ibss.fixed_bssid = true;
1664 } else
1665 sdata->u.ibss.fixed_bssid = false;
1666
1667 sdata->u.ibss.privacy = params->privacy;
1668 sdata->u.ibss.control_port = params->control_port;
1669 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1670 sdata->u.ibss.basic_rates = params->basic_rates;
1671 sdata->u.ibss.last_scan_completed = jiffies;
1672
1673 /* fix basic_rates if channel does not support these rates */
1674 rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1675 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1676 for (i = 0; i < sband->n_bitrates; i++) {
1677 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1678 sdata->u.ibss.basic_rates &= ~BIT(i);
1679 }
1680 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1681 sizeof(params->mcast_rate));
1682
1683 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1684
1685 sdata->u.ibss.chandef = params->chandef;
1686 sdata->u.ibss.fixed_channel = params->channel_fixed;
1687
1688 if (params->ie) {
1689 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1690 GFP_KERNEL);
1691 if (sdata->u.ibss.ie)
1692 sdata->u.ibss.ie_len = params->ie_len;
1693 }
1694
1695 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1696 sdata->u.ibss.ibss_join_req = jiffies;
1697
1698 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1699 sdata->u.ibss.ssid_len = params->ssid_len;
1700
1701 memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1702 sizeof(sdata->u.ibss.ht_capa));
1703 memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1704 sizeof(sdata->u.ibss.ht_capa_mask));
1705
1706 /*
1707 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1708 * reserved, but an HT STA shall protect HT transmissions as though
1709 * the HT Protection field were set to non-HT mixed mode.
1710 *
1711 * In an IBSS, the RIFS Mode field of the HT Operation element is
1712 * also reserved, but an HT STA shall operate as though this field
1713 * were set to 1.
1714 */
1715
1716 sdata->vif.bss_conf.ht_operation_mode |=
1717 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1718 | IEEE80211_HT_PARAM_RIFS_MODE;
1719
1720 changed |= BSS_CHANGED_HT;
1721 ieee80211_bss_info_change_notify(sdata, changed);
1722
1723 sdata->smps_mode = IEEE80211_SMPS_OFF;
1724 sdata->needed_rx_chains = local->rx_chains;
1725
1726 ieee80211_queue_work(&local->hw, &sdata->work);
1727
1728 return 0;
1729 }
1730
1731 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1732 {
1733 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1734
1735 ieee80211_ibss_disconnect(sdata);
1736 ifibss->ssid_len = 0;
1737 memset(ifibss->bssid, 0, ETH_ALEN);
1738
1739 /* remove beacon */
1740 kfree(sdata->u.ibss.ie);
1741
1742 /* on the next join, re-program HT parameters */
1743 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1744 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1745
1746 synchronize_rcu();
1747
1748 skb_queue_purge(&sdata->skb_queue);
1749
1750 del_timer_sync(&sdata->u.ibss.timer);
1751
1752 return 0;
1753 }
Linux kernel - Deliverables
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