]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - net/mac80211/ibss.c
projects / mirror_ubuntu-bionic-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'for-john' of git://git.kernel.org/pub/scm/linux/kernel/git/iwlwifi...
[mirror_ubuntu-bionic-kernel.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 sdata->csa_counter_offset_beacon = (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++ = WLAN_EID_VENDOR_SPECIFIC;
194 *pos++ = 7; /* len */
195 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
196 *pos++ = 0x50;
197 *pos++ = 0xf2;
198 *pos++ = 2; /* WME */
199 *pos++ = 0; /* WME info */
200 *pos++ = 1; /* WME ver */
201 *pos++ = 0; /* U-APSD no in use */
202 }
203
204 presp->head_len = pos - presp->head;
205 if (WARN_ON(presp->head_len > frame_len))
206 goto error;
207
208 return presp;
209 error:
210 kfree(presp);
211 return NULL;
212 }
213
214 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
215 const u8 *bssid, const int beacon_int,
216 struct cfg80211_chan_def *req_chandef,
217 const u32 basic_rates,
218 const u16 capability, u64 tsf,
219 bool creator)
220 {
221 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
222 struct ieee80211_local *local = sdata->local;
223 struct ieee80211_mgmt *mgmt;
224 struct cfg80211_bss *bss;
225 u32 bss_change;
226 struct cfg80211_chan_def chandef;
227 struct ieee80211_channel *chan;
228 struct beacon_data *presp;
229 enum nl80211_bss_scan_width scan_width;
230 bool have_higher_than_11mbit;
231 bool radar_required = false;
232 int err;
233
234 sdata_assert_lock(sdata);
235
236 /* Reset own TSF to allow time synchronization work. */
237 drv_reset_tsf(local, sdata);
238
239 if (!ether_addr_equal(ifibss->bssid, bssid))
240 sta_info_flush(sdata);
241
242 /* if merging, indicate to driver that we leave the old IBSS */
243 if (sdata->vif.bss_conf.ibss_joined) {
244 sdata->vif.bss_conf.ibss_joined = false;
245 sdata->vif.bss_conf.ibss_creator = false;
246 sdata->vif.bss_conf.enable_beacon = false;
247 netif_carrier_off(sdata->dev);
248 ieee80211_bss_info_change_notify(sdata,
249 BSS_CHANGED_IBSS |
250 BSS_CHANGED_BEACON_ENABLED);
251 drv_leave_ibss(local, sdata);
252 }
253
254 presp = rcu_dereference_protected(ifibss->presp,
255 lockdep_is_held(&sdata->wdev.mtx));
256 rcu_assign_pointer(ifibss->presp, NULL);
257 if (presp)
258 kfree_rcu(presp, rcu_head);
259
260 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
261
262 /* make a copy of the chandef, it could be modified below. */
263 chandef = *req_chandef;
264 chan = chandef.chan;
265 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
266 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
267 chandef.width == NL80211_CHAN_WIDTH_10 ||
268 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
269 chandef.width == NL80211_CHAN_WIDTH_20) {
270 sdata_info(sdata,
271 "Failed to join IBSS, beacons forbidden\n");
272 return;
273 }
274 chandef.width = NL80211_CHAN_WIDTH_20;
275 chandef.center_freq1 = chan->center_freq;
276 /* check again for downgraded chandef */
277 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
278 sdata_info(sdata,
279 "Failed to join IBSS, beacons forbidden\n");
280 return;
281 }
282 }
283
284 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
285 &chandef);
286 if (err < 0) {
287 sdata_info(sdata,
288 "Failed to join IBSS, invalid chandef\n");
289 return;
290 }
291 if (err > 0) {
292 if (!ifibss->userspace_handles_dfs) {
293 sdata_info(sdata,
294 "Failed to join IBSS, DFS channel without control program\n");
295 return;
296 }
297 radar_required = true;
298 }
299
300 mutex_lock(&local->mtx);
301 if (ieee80211_vif_use_channel(sdata, &chandef,
302 ifibss->fixed_channel ?
303 IEEE80211_CHANCTX_SHARED :
304 IEEE80211_CHANCTX_EXCLUSIVE)) {
305 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
306 mutex_unlock(&local->mtx);
307 return;
308 }
309 sdata->radar_required = radar_required;
310 mutex_unlock(&local->mtx);
311
312 memcpy(ifibss->bssid, bssid, ETH_ALEN);
313
314 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
315 capability, tsf, &chandef,
316 &have_higher_than_11mbit, NULL);
317 if (!presp)
318 return;
319
320 rcu_assign_pointer(ifibss->presp, presp);
321 mgmt = (void *)presp->head;
322
323 sdata->vif.bss_conf.enable_beacon = true;
324 sdata->vif.bss_conf.beacon_int = beacon_int;
325 sdata->vif.bss_conf.basic_rates = basic_rates;
326 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
327 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
328 bss_change = BSS_CHANGED_BEACON_INT;
329 bss_change |= ieee80211_reset_erp_info(sdata);
330 bss_change |= BSS_CHANGED_BSSID;
331 bss_change |= BSS_CHANGED_BEACON;
332 bss_change |= BSS_CHANGED_BEACON_ENABLED;
333 bss_change |= BSS_CHANGED_BASIC_RATES;
334 bss_change |= BSS_CHANGED_HT;
335 bss_change |= BSS_CHANGED_IBSS;
336 bss_change |= BSS_CHANGED_SSID;
337
338 /*
339 * In 5 GHz/802.11a, we can always use short slot time.
340 * (IEEE 802.11-2012 18.3.8.7)
341 *
342 * In 2.4GHz, we must always use long slots in IBSS for compatibility
343 * reasons.
344 * (IEEE 802.11-2012 19.4.5)
345 *
346 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
347 */
348 sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
349 bss_change |= BSS_CHANGED_ERP_SLOT;
350
351 /* cf. IEEE 802.11 9.2.12 */
352 if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
353 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
354 else
355 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
356
357 ieee80211_set_wmm_default(sdata, true);
358
359 sdata->vif.bss_conf.ibss_joined = true;
360 sdata->vif.bss_conf.ibss_creator = creator;
361
362 err = drv_join_ibss(local, sdata);
363 if (err) {
364 sdata->vif.bss_conf.ibss_joined = false;
365 sdata->vif.bss_conf.ibss_creator = false;
366 sdata->vif.bss_conf.enable_beacon = false;
367 sdata->vif.bss_conf.ssid_len = 0;
368 RCU_INIT_POINTER(ifibss->presp, NULL);
369 kfree_rcu(presp, rcu_head);
370 mutex_lock(&local->mtx);
371 ieee80211_vif_release_channel(sdata);
372 mutex_unlock(&local->mtx);
373 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
374 err);
375 return;
376 }
377
378 ieee80211_bss_info_change_notify(sdata, bss_change);
379
380 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
381 mod_timer(&ifibss->timer,
382 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
383
384 scan_width = cfg80211_chandef_to_scan_width(&chandef);
385 bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan,
386 scan_width, mgmt,
387 presp->head_len, 0, GFP_KERNEL);
388 cfg80211_put_bss(local->hw.wiphy, bss);
389 netif_carrier_on(sdata->dev);
390 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
391 }
392
393 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
394 struct ieee80211_bss *bss)
395 {
396 struct cfg80211_bss *cbss =
397 container_of((void *)bss, struct cfg80211_bss, priv);
398 struct ieee80211_supported_band *sband;
399 struct cfg80211_chan_def chandef;
400 u32 basic_rates;
401 int i, j;
402 u16 beacon_int = cbss->beacon_interval;
403 const struct cfg80211_bss_ies *ies;
404 enum nl80211_channel_type chan_type;
405 u64 tsf;
406 u32 rate_flags;
407 int shift;
408
409 sdata_assert_lock(sdata);
410
411 if (beacon_int < 10)
412 beacon_int = 10;
413
414 switch (sdata->u.ibss.chandef.width) {
415 case NL80211_CHAN_WIDTH_20_NOHT:
416 case NL80211_CHAN_WIDTH_20:
417 case NL80211_CHAN_WIDTH_40:
418 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
419 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
420 break;
421 case NL80211_CHAN_WIDTH_5:
422 case NL80211_CHAN_WIDTH_10:
423 cfg80211_chandef_create(&chandef, cbss->channel,
424 NL80211_CHAN_WIDTH_20_NOHT);
425 chandef.width = sdata->u.ibss.chandef.width;
426 break;
427 default:
428 /* fall back to 20 MHz for unsupported modes */
429 cfg80211_chandef_create(&chandef, cbss->channel,
430 NL80211_CHAN_WIDTH_20_NOHT);
431 break;
432 }
433
434 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
435 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
436 shift = ieee80211_vif_get_shift(&sdata->vif);
437
438 basic_rates = 0;
439
440 for (i = 0; i < bss->supp_rates_len; i++) {
441 int rate = bss->supp_rates[i] & 0x7f;
442 bool is_basic = !!(bss->supp_rates[i] & 0x80);
443
444 for (j = 0; j < sband->n_bitrates; j++) {
445 int brate;
446 if ((rate_flags & sband->bitrates[j].flags)
447 != rate_flags)
448 continue;
449
450 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
451 5 * (1 << shift));
452 if (brate == rate) {
453 if (is_basic)
454 basic_rates |= BIT(j);
455 break;
456 }
457 }
458 }
459
460 rcu_read_lock();
461 ies = rcu_dereference(cbss->ies);
462 tsf = ies->tsf;
463 rcu_read_unlock();
464
465 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
466 beacon_int,
467 &chandef,
468 basic_rates,
469 cbss->capability,
470 tsf, false);
471 }
472
473 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
474 struct cfg80211_csa_settings *csa_settings)
475 {
476 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
477 struct beacon_data *presp, *old_presp;
478 struct cfg80211_bss *cbss;
479 const struct cfg80211_bss_ies *ies;
480 u16 capability;
481 u64 tsf;
482 int ret = 0;
483
484 sdata_assert_lock(sdata);
485
486 capability = WLAN_CAPABILITY_IBSS;
487
488 if (ifibss->privacy)
489 capability |= WLAN_CAPABILITY_PRIVACY;
490
491 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
492 ifibss->bssid, ifibss->ssid,
493 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
494 WLAN_CAPABILITY_PRIVACY,
495 capability);
496
497 if (WARN_ON(!cbss)) {
498 ret = -EINVAL;
499 goto out;
500 }
501
502 rcu_read_lock();
503 ies = rcu_dereference(cbss->ies);
504 tsf = ies->tsf;
505 rcu_read_unlock();
506 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
507
508 old_presp = rcu_dereference_protected(ifibss->presp,
509 lockdep_is_held(&sdata->wdev.mtx));
510
511 presp = ieee80211_ibss_build_presp(sdata,
512 sdata->vif.bss_conf.beacon_int,
513 sdata->vif.bss_conf.basic_rates,
514 capability, tsf, &ifibss->chandef,
515 NULL, csa_settings);
516 if (!presp) {
517 ret = -ENOMEM;
518 goto out;
519 }
520
521 rcu_assign_pointer(ifibss->presp, presp);
522 if (old_presp)
523 kfree_rcu(old_presp, rcu_head);
524
525 return BSS_CHANGED_BEACON;
526 out:
527 return ret;
528 }
529
530 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
531 {
532 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
533 struct cfg80211_bss *cbss;
534 int err, changed = 0;
535 u16 capability;
536
537 sdata_assert_lock(sdata);
538
539 /* update cfg80211 bss information with the new channel */
540 if (!is_zero_ether_addr(ifibss->bssid)) {
541 capability = WLAN_CAPABILITY_IBSS;
542
543 if (ifibss->privacy)
544 capability |= WLAN_CAPABILITY_PRIVACY;
545
546 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
547 ifibss->chandef.chan,
548 ifibss->bssid, ifibss->ssid,
549 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
550 WLAN_CAPABILITY_PRIVACY,
551 capability);
552 /* XXX: should not really modify cfg80211 data */
553 if (cbss) {
554 cbss->channel = sdata->csa_chandef.chan;
555 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
556 }
557 }
558
559 ifibss->chandef = sdata->csa_chandef;
560
561 /* generate the beacon */
562 err = ieee80211_ibss_csa_beacon(sdata, NULL);
563 if (err < 0)
564 return err;
565
566 changed |= err;
567
568 return changed;
569 }
570
571 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
572 {
573 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
574
575 cancel_work_sync(&ifibss->csa_connection_drop_work);
576 }
577
578 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
579 __acquires(RCU)
580 {
581 struct ieee80211_sub_if_data *sdata = sta->sdata;
582 u8 addr[ETH_ALEN];
583
584 memcpy(addr, sta->sta.addr, ETH_ALEN);
585
586 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
587
588 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
589 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
590 /* authorize the station only if the network is not RSN protected. If
591 * not wait for the userspace to authorize it */
592 if (!sta->sdata->u.ibss.control_port)
593 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
594
595 rate_control_rate_init(sta);
596
597 /* If it fails, maybe we raced another insertion? */
598 if (sta_info_insert_rcu(sta))
599 return sta_info_get(sdata, addr);
600 return sta;
601 }
602
603 static struct sta_info *
604 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
605 const u8 *addr, u32 supp_rates)
606 __acquires(RCU)
607 {
608 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
609 struct ieee80211_local *local = sdata->local;
610 struct sta_info *sta;
611 struct ieee80211_chanctx_conf *chanctx_conf;
612 struct ieee80211_supported_band *sband;
613 enum nl80211_bss_scan_width scan_width;
614 int band;
615
616 /*
617 * XXX: Consider removing the least recently used entry and
618 * allow new one to be added.
619 */
620 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
621 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
622 sdata->name, addr);
623 rcu_read_lock();
624 return NULL;
625 }
626
627 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
628 rcu_read_lock();
629 return NULL;
630 }
631
632 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
633 rcu_read_lock();
634 return NULL;
635 }
636
637 rcu_read_lock();
638 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
639 if (WARN_ON_ONCE(!chanctx_conf))
640 return NULL;
641 band = chanctx_conf->def.chan->band;
642 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
643 rcu_read_unlock();
644
645 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
646 if (!sta) {
647 rcu_read_lock();
648 return NULL;
649 }
650
651 sta->last_rx = jiffies;
652
653 /* make sure mandatory rates are always added */
654 sband = local->hw.wiphy->bands[band];
655 sta->sta.supp_rates[band] = supp_rates |
656 ieee80211_mandatory_rates(sband, scan_width);
657
658 return ieee80211_ibss_finish_sta(sta);
659 }
660
661 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
662 {
663 struct ieee80211_local *local = sdata->local;
664 int active = 0;
665 struct sta_info *sta;
666
667 sdata_assert_lock(sdata);
668
669 rcu_read_lock();
670
671 list_for_each_entry_rcu(sta, &local->sta_list, list) {
672 if (sta->sdata == sdata &&
673 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
674 jiffies)) {
675 active++;
676 break;
677 }
678 }
679
680 rcu_read_unlock();
681
682 return active;
683 }
684
685 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
686 {
687 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
688 struct ieee80211_local *local = sdata->local;
689 struct cfg80211_bss *cbss;
690 struct beacon_data *presp;
691 struct sta_info *sta;
692 u16 capability;
693
694 if (!is_zero_ether_addr(ifibss->bssid)) {
695 capability = WLAN_CAPABILITY_IBSS;
696
697 if (ifibss->privacy)
698 capability |= WLAN_CAPABILITY_PRIVACY;
699
700 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
701 ifibss->bssid, ifibss->ssid,
702 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
703 WLAN_CAPABILITY_PRIVACY,
704 capability);
705
706 if (cbss) {
707 cfg80211_unlink_bss(local->hw.wiphy, cbss);
708 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
709 }
710 }
711
712 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
713
714 sta_info_flush(sdata);
715
716 spin_lock_bh(&ifibss->incomplete_lock);
717 while (!list_empty(&ifibss->incomplete_stations)) {
718 sta = list_first_entry(&ifibss->incomplete_stations,
719 struct sta_info, list);
720 list_del(&sta->list);
721 spin_unlock_bh(&ifibss->incomplete_lock);
722
723 sta_info_free(local, sta);
724 spin_lock_bh(&ifibss->incomplete_lock);
725 }
726 spin_unlock_bh(&ifibss->incomplete_lock);
727
728 netif_carrier_off(sdata->dev);
729
730 sdata->vif.bss_conf.ibss_joined = false;
731 sdata->vif.bss_conf.ibss_creator = false;
732 sdata->vif.bss_conf.enable_beacon = false;
733 sdata->vif.bss_conf.ssid_len = 0;
734
735 /* remove beacon */
736 presp = rcu_dereference_protected(ifibss->presp,
737 lockdep_is_held(&sdata->wdev.mtx));
738 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
739 if (presp)
740 kfree_rcu(presp, rcu_head);
741
742 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
743 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
744 BSS_CHANGED_IBSS);
745 drv_leave_ibss(local, sdata);
746 mutex_lock(&local->mtx);
747 ieee80211_vif_release_channel(sdata);
748 mutex_unlock(&local->mtx);
749 }
750
751 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
752 {
753 struct ieee80211_sub_if_data *sdata =
754 container_of(work, struct ieee80211_sub_if_data,
755 u.ibss.csa_connection_drop_work);
756
757 sdata_lock(sdata);
758
759 ieee80211_ibss_disconnect(sdata);
760 synchronize_rcu();
761 skb_queue_purge(&sdata->skb_queue);
762
763 /* trigger a scan to find another IBSS network to join */
764 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
765
766 sdata_unlock(sdata);
767 }
768
769 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
770 {
771 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
772 int err;
773
774 /* if the current channel is a DFS channel, mark the channel as
775 * unavailable.
776 */
777 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
778 &ifibss->chandef);
779 if (err > 0)
780 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
781 GFP_ATOMIC);
782 }
783
784 static bool
785 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
786 struct ieee802_11_elems *elems,
787 bool beacon)
788 {
789 struct cfg80211_csa_settings params;
790 struct ieee80211_csa_ie csa_ie;
791 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
792 enum nl80211_channel_type ch_type;
793 int err;
794 u32 sta_flags;
795
796 sdata_assert_lock(sdata);
797
798 sta_flags = IEEE80211_STA_DISABLE_VHT;
799 switch (ifibss->chandef.width) {
800 case NL80211_CHAN_WIDTH_5:
801 case NL80211_CHAN_WIDTH_10:
802 case NL80211_CHAN_WIDTH_20_NOHT:
803 sta_flags |= IEEE80211_STA_DISABLE_HT;
804 /* fall through */
805 case NL80211_CHAN_WIDTH_20:
806 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
807 break;
808 default:
809 break;
810 }
811
812 memset(&params, 0, sizeof(params));
813 memset(&csa_ie, 0, sizeof(csa_ie));
814 err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon,
815 ifibss->chandef.chan->band,
816 sta_flags, ifibss->bssid, &csa_ie);
817 /* can't switch to destination channel, fail */
818 if (err < 0)
819 goto disconnect;
820
821 /* did not contain a CSA */
822 if (err)
823 return false;
824
825 /* channel switch is not supported, disconnect */
826 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
827 goto disconnect;
828
829 params.count = csa_ie.count;
830 params.chandef = csa_ie.chandef;
831
832 switch (ifibss->chandef.width) {
833 case NL80211_CHAN_WIDTH_20_NOHT:
834 case NL80211_CHAN_WIDTH_20:
835 case NL80211_CHAN_WIDTH_40:
836 /* keep our current HT mode (HT20/HT40+/HT40-), even if
837 * another mode has been announced. The mode is not adopted
838 * within the beacon while doing CSA and we should therefore
839 * keep the mode which we announce.
840 */
841 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
842 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
843 ch_type);
844 break;
845 case NL80211_CHAN_WIDTH_5:
846 case NL80211_CHAN_WIDTH_10:
847 if (params.chandef.width != ifibss->chandef.width) {
848 sdata_info(sdata,
849 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
850 ifibss->bssid,
851 params.chandef.chan->center_freq,
852 params.chandef.width,
853 params.chandef.center_freq1,
854 params.chandef.center_freq2);
855 goto disconnect;
856 }
857 break;
858 default:
859 /* should not happen, sta_flags should prevent VHT modes. */
860 WARN_ON(1);
861 goto disconnect;
862 }
863
864 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef)) {
865 sdata_info(sdata,
866 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
867 ifibss->bssid,
868 params.chandef.chan->center_freq,
869 params.chandef.width,
870 params.chandef.center_freq1,
871 params.chandef.center_freq2);
872 goto disconnect;
873 }
874
875 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
876 &params.chandef);
877 if (err < 0)
878 goto disconnect;
879 if (err) {
880 /* IBSS-DFS only allowed with a control program */
881 if (!ifibss->userspace_handles_dfs)
882 goto disconnect;
883
884 params.radar_required = true;
885 }
886
887 if (cfg80211_chandef_identical(&params.chandef,
888 &sdata->vif.bss_conf.chandef)) {
889 ibss_dbg(sdata,
890 "received csa with an identical chandef, ignoring\n");
891 return true;
892 }
893
894 /* all checks done, now perform the channel switch. */
895 ibss_dbg(sdata,
896 "received channel switch announcement to go to channel %d MHz\n",
897 params.chandef.chan->center_freq);
898
899 params.block_tx = !!csa_ie.mode;
900
901 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
902 &params))
903 goto disconnect;
904
905 ieee80211_ibss_csa_mark_radar(sdata);
906
907 return true;
908 disconnect:
909 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
910 ieee80211_queue_work(&sdata->local->hw,
911 &ifibss->csa_connection_drop_work);
912
913 ieee80211_ibss_csa_mark_radar(sdata);
914
915 return true;
916 }
917
918 static void
919 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
920 struct ieee80211_mgmt *mgmt, size_t len,
921 struct ieee80211_rx_status *rx_status,
922 struct ieee802_11_elems *elems)
923 {
924 int required_len;
925
926 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
927 return;
928
929 /* CSA is the only action we handle for now */
930 if (mgmt->u.action.u.measurement.action_code !=
931 WLAN_ACTION_SPCT_CHL_SWITCH)
932 return;
933
934 required_len = IEEE80211_MIN_ACTION_SIZE +
935 sizeof(mgmt->u.action.u.chan_switch);
936 if (len < required_len)
937 return;
938
939 if (!sdata->vif.csa_active)
940 ieee80211_ibss_process_chanswitch(sdata, elems, false);
941 }
942
943 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
944 struct ieee80211_mgmt *mgmt,
945 size_t len)
946 {
947 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
948
949 if (len < IEEE80211_DEAUTH_FRAME_LEN)
950 return;
951
952 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
953 mgmt->sa, mgmt->da, mgmt->bssid, reason);
954 sta_info_destroy_addr(sdata, mgmt->sa);
955 }
956
957 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
958 struct ieee80211_mgmt *mgmt,
959 size_t len)
960 {
961 u16 auth_alg, auth_transaction;
962
963 sdata_assert_lock(sdata);
964
965 if (len < 24 + 6)
966 return;
967
968 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
969 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
970
971 ibss_dbg(sdata,
972 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
973 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
974
975 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
976 return;
977
978 /*
979 * IEEE 802.11 standard does not require authentication in IBSS
980 * networks and most implementations do not seem to use it.
981 * However, try to reply to authentication attempts if someone
982 * has actually implemented this.
983 */
984 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
985 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
986 }
987
988 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
989 struct ieee80211_mgmt *mgmt, size_t len,
990 struct ieee80211_rx_status *rx_status,
991 struct ieee802_11_elems *elems)
992 {
993 struct ieee80211_local *local = sdata->local;
994 int freq;
995 struct cfg80211_bss *cbss;
996 struct ieee80211_bss *bss;
997 struct sta_info *sta;
998 struct ieee80211_channel *channel;
999 u64 beacon_timestamp, rx_timestamp;
1000 u32 supp_rates = 0;
1001 enum ieee80211_band band = rx_status->band;
1002 enum nl80211_bss_scan_width scan_width;
1003 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
1004 bool rates_updated = false;
1005
1006 if (elems->ds_params)
1007 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1008 band);
1009 else
1010 freq = rx_status->freq;
1011
1012 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1013
1014 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1015 return;
1016
1017 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1018 ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
1019
1020 rcu_read_lock();
1021 sta = sta_info_get(sdata, mgmt->sa);
1022
1023 if (elems->supp_rates) {
1024 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1025 band, NULL);
1026 if (sta) {
1027 u32 prev_rates;
1028
1029 prev_rates = sta->sta.supp_rates[band];
1030 /* make sure mandatory rates are always added */
1031 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1032 if (rx_status->flag & RX_FLAG_5MHZ)
1033 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1034 if (rx_status->flag & RX_FLAG_10MHZ)
1035 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1036
1037 sta->sta.supp_rates[band] = supp_rates |
1038 ieee80211_mandatory_rates(sband,
1039 scan_width);
1040 if (sta->sta.supp_rates[band] != prev_rates) {
1041 ibss_dbg(sdata,
1042 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1043 sta->sta.addr, prev_rates,
1044 sta->sta.supp_rates[band]);
1045 rates_updated = true;
1046 }
1047 } else {
1048 rcu_read_unlock();
1049 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1050 mgmt->sa, supp_rates);
1051 }
1052 }
1053
1054 if (sta && elems->wmm_info)
1055 set_sta_flag(sta, WLAN_STA_WME);
1056
1057 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1058 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1059 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1060 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1061 /* we both use HT */
1062 struct ieee80211_ht_cap htcap_ie;
1063 struct cfg80211_chan_def chandef;
1064
1065 ieee80211_ht_oper_to_chandef(channel,
1066 elems->ht_operation,
1067 &chandef);
1068
1069 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1070
1071 /*
1072 * fall back to HT20 if we don't use or use
1073 * the other extension channel
1074 */
1075 if (chandef.center_freq1 !=
1076 sdata->u.ibss.chandef.center_freq1)
1077 htcap_ie.cap_info &=
1078 cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
1079
1080 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
1081 sdata, sband, &htcap_ie, sta);
1082 }
1083
1084 if (sta && rates_updated) {
1085 drv_sta_rc_update(local, sdata, &sta->sta,
1086 IEEE80211_RC_SUPP_RATES_CHANGED);
1087 rate_control_rate_init(sta);
1088 }
1089
1090 rcu_read_unlock();
1091 }
1092
1093 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1094 channel);
1095 if (!bss)
1096 return;
1097
1098 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1099
1100 /* same for beacon and probe response */
1101 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1102
1103 /* check if we need to merge IBSS */
1104
1105 /* not an IBSS */
1106 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1107 goto put_bss;
1108
1109 /* different channel */
1110 if (sdata->u.ibss.fixed_channel &&
1111 sdata->u.ibss.chandef.chan != cbss->channel)
1112 goto put_bss;
1113
1114 /* different SSID */
1115 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1116 memcmp(elems->ssid, sdata->u.ibss.ssid,
1117 sdata->u.ibss.ssid_len))
1118 goto put_bss;
1119
1120 /* process channel switch */
1121 if (sdata->vif.csa_active ||
1122 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1123 goto put_bss;
1124
1125 /* same BSSID */
1126 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1127 goto put_bss;
1128
1129 /* we use a fixed BSSID */
1130 if (sdata->u.ibss.fixed_bssid)
1131 goto put_bss;
1132
1133 if (ieee80211_have_rx_timestamp(rx_status)) {
1134 /* time when timestamp field was received */
1135 rx_timestamp =
1136 ieee80211_calculate_rx_timestamp(local, rx_status,
1137 len + FCS_LEN, 24);
1138 } else {
1139 /*
1140 * second best option: get current TSF
1141 * (will return -1 if not supported)
1142 */
1143 rx_timestamp = drv_get_tsf(local, sdata);
1144 }
1145
1146 ibss_dbg(sdata,
1147 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1148 mgmt->sa, mgmt->bssid,
1149 (unsigned long long)rx_timestamp,
1150 (unsigned long long)beacon_timestamp,
1151 (unsigned long long)(rx_timestamp - beacon_timestamp),
1152 jiffies);
1153
1154 if (beacon_timestamp > rx_timestamp) {
1155 ibss_dbg(sdata,
1156 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1157 mgmt->bssid);
1158 ieee80211_sta_join_ibss(sdata, bss);
1159 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1160 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1161 supp_rates);
1162 rcu_read_unlock();
1163 }
1164
1165 put_bss:
1166 ieee80211_rx_bss_put(local, bss);
1167 }
1168
1169 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1170 const u8 *bssid, const u8 *addr,
1171 u32 supp_rates)
1172 {
1173 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1174 struct ieee80211_local *local = sdata->local;
1175 struct sta_info *sta;
1176 struct ieee80211_chanctx_conf *chanctx_conf;
1177 struct ieee80211_supported_band *sband;
1178 enum nl80211_bss_scan_width scan_width;
1179 int band;
1180
1181 /*
1182 * XXX: Consider removing the least recently used entry and
1183 * allow new one to be added.
1184 */
1185 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1186 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1187 sdata->name, addr);
1188 return;
1189 }
1190
1191 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1192 return;
1193
1194 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1195 return;
1196
1197 rcu_read_lock();
1198 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1199 if (WARN_ON_ONCE(!chanctx_conf)) {
1200 rcu_read_unlock();
1201 return;
1202 }
1203 band = chanctx_conf->def.chan->band;
1204 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1205 rcu_read_unlock();
1206
1207 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1208 if (!sta)
1209 return;
1210
1211 sta->last_rx = jiffies;
1212
1213 /* make sure mandatory rates are always added */
1214 sband = local->hw.wiphy->bands[band];
1215 sta->sta.supp_rates[band] = supp_rates |
1216 ieee80211_mandatory_rates(sband, scan_width);
1217
1218 spin_lock(&ifibss->incomplete_lock);
1219 list_add(&sta->list, &ifibss->incomplete_stations);
1220 spin_unlock(&ifibss->incomplete_lock);
1221 ieee80211_queue_work(&local->hw, &sdata->work);
1222 }
1223
1224 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1225 {
1226 struct ieee80211_local *local = sdata->local;
1227 struct sta_info *sta, *tmp;
1228 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1229 unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1230
1231 mutex_lock(&local->sta_mtx);
1232
1233 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1234 if (sdata != sta->sdata)
1235 continue;
1236
1237 if (time_after(jiffies, sta->last_rx + exp_time) ||
1238 (time_after(jiffies, sta->last_rx + exp_rsn_time) &&
1239 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1240 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1241 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1242 "not authorized " : "", sta->sta.addr);
1243
1244 WARN_ON(__sta_info_destroy(sta));
1245 }
1246 }
1247
1248 mutex_unlock(&local->sta_mtx);
1249 }
1250
1251 /*
1252 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1253 */
1254
1255 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1256 {
1257 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1258 enum nl80211_bss_scan_width scan_width;
1259
1260 sdata_assert_lock(sdata);
1261
1262 mod_timer(&ifibss->timer,
1263 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1264
1265 ieee80211_ibss_sta_expire(sdata);
1266
1267 if (time_before(jiffies, ifibss->last_scan_completed +
1268 IEEE80211_IBSS_MERGE_INTERVAL))
1269 return;
1270
1271 if (ieee80211_sta_active_ibss(sdata))
1272 return;
1273
1274 if (ifibss->fixed_channel)
1275 return;
1276
1277 sdata_info(sdata,
1278 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1279
1280 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1281 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1282 NULL, scan_width);
1283 }
1284
1285 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1286 {
1287 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1288 u8 bssid[ETH_ALEN];
1289 u16 capability;
1290 int i;
1291
1292 sdata_assert_lock(sdata);
1293
1294 if (ifibss->fixed_bssid) {
1295 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1296 } else {
1297 /* Generate random, not broadcast, locally administered BSSID. Mix in
1298 * own MAC address to make sure that devices that do not have proper
1299 * random number generator get different BSSID. */
1300 get_random_bytes(bssid, ETH_ALEN);
1301 for (i = 0; i < ETH_ALEN; i++)
1302 bssid[i] ^= sdata->vif.addr[i];
1303 bssid[0] &= ~0x01;
1304 bssid[0] |= 0x02;
1305 }
1306
1307 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1308
1309 capability = WLAN_CAPABILITY_IBSS;
1310
1311 if (ifibss->privacy)
1312 capability |= WLAN_CAPABILITY_PRIVACY;
1313 else
1314 sdata->drop_unencrypted = 0;
1315
1316 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1317 &ifibss->chandef, ifibss->basic_rates,
1318 capability, 0, true);
1319 }
1320
1321 /*
1322 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1323 */
1324
1325 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1326 {
1327 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1328 struct ieee80211_local *local = sdata->local;
1329 struct cfg80211_bss *cbss;
1330 struct ieee80211_channel *chan = NULL;
1331 const u8 *bssid = NULL;
1332 enum nl80211_bss_scan_width scan_width;
1333 int active_ibss;
1334 u16 capability;
1335
1336 sdata_assert_lock(sdata);
1337
1338 active_ibss = ieee80211_sta_active_ibss(sdata);
1339 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1340
1341 if (active_ibss)
1342 return;
1343
1344 capability = WLAN_CAPABILITY_IBSS;
1345 if (ifibss->privacy)
1346 capability |= WLAN_CAPABILITY_PRIVACY;
1347 if (ifibss->fixed_bssid)
1348 bssid = ifibss->bssid;
1349 if (ifibss->fixed_channel)
1350 chan = ifibss->chandef.chan;
1351 if (!is_zero_ether_addr(ifibss->bssid))
1352 bssid = ifibss->bssid;
1353 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1354 ifibss->ssid, ifibss->ssid_len,
1355 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
1356 capability);
1357
1358 if (cbss) {
1359 struct ieee80211_bss *bss;
1360
1361 bss = (void *)cbss->priv;
1362 ibss_dbg(sdata,
1363 "sta_find_ibss: selected %pM current %pM\n",
1364 cbss->bssid, ifibss->bssid);
1365 sdata_info(sdata,
1366 "Selected IBSS BSSID %pM based on configured SSID\n",
1367 cbss->bssid);
1368
1369 ieee80211_sta_join_ibss(sdata, bss);
1370 ieee80211_rx_bss_put(local, bss);
1371 return;
1372 }
1373
1374 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1375 * directly and do not waste time scanning
1376 */
1377 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1378 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1379 bssid);
1380 ieee80211_sta_create_ibss(sdata);
1381 return;
1382 }
1383
1384
1385 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1386
1387 /* Selected IBSS not found in current scan results - try to scan */
1388 if (time_after(jiffies, ifibss->last_scan_completed +
1389 IEEE80211_SCAN_INTERVAL)) {
1390 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1391
1392 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1393 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1394 ifibss->ssid_len, chan,
1395 scan_width);
1396 } else {
1397 int interval = IEEE80211_SCAN_INTERVAL;
1398
1399 if (time_after(jiffies, ifibss->ibss_join_req +
1400 IEEE80211_IBSS_JOIN_TIMEOUT))
1401 ieee80211_sta_create_ibss(sdata);
1402
1403 mod_timer(&ifibss->timer,
1404 round_jiffies(jiffies + interval));
1405 }
1406 }
1407
1408 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1409 struct sk_buff *req)
1410 {
1411 struct ieee80211_mgmt *mgmt = (void *)req->data;
1412 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1413 struct ieee80211_local *local = sdata->local;
1414 int tx_last_beacon, len = req->len;
1415 struct sk_buff *skb;
1416 struct beacon_data *presp;
1417 u8 *pos, *end;
1418
1419 sdata_assert_lock(sdata);
1420
1421 presp = rcu_dereference_protected(ifibss->presp,
1422 lockdep_is_held(&sdata->wdev.mtx));
1423
1424 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1425 len < 24 + 2 || !presp)
1426 return;
1427
1428 tx_last_beacon = drv_tx_last_beacon(local);
1429
1430 ibss_dbg(sdata,
1431 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1432 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1433
1434 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1435 return;
1436
1437 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1438 !is_broadcast_ether_addr(mgmt->bssid))
1439 return;
1440
1441 end = ((u8 *) mgmt) + len;
1442 pos = mgmt->u.probe_req.variable;
1443 if (pos[0] != WLAN_EID_SSID ||
1444 pos + 2 + pos[1] > end) {
1445 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1446 mgmt->sa);
1447 return;
1448 }
1449 if (pos[1] != 0 &&
1450 (pos[1] != ifibss->ssid_len ||
1451 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1452 /* Ignore ProbeReq for foreign SSID */
1453 return;
1454 }
1455
1456 /* Reply with ProbeResp */
1457 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1458 if (!skb)
1459 return;
1460
1461 skb_reserve(skb, local->tx_headroom);
1462 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1463
1464 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1465 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1466 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1467
1468 /* avoid excessive retries for probe request to wildcard SSIDs */
1469 if (pos[1] == 0)
1470 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1471
1472 ieee80211_tx_skb(sdata, skb);
1473 }
1474
1475 static
1476 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1477 struct ieee80211_mgmt *mgmt, size_t len,
1478 struct ieee80211_rx_status *rx_status)
1479 {
1480 size_t baselen;
1481 struct ieee802_11_elems elems;
1482
1483 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1484 offsetof(typeof(mgmt->u.beacon), variable));
1485
1486 /*
1487 * either beacon or probe_resp but the variable field is at the
1488 * same offset
1489 */
1490 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1491 if (baselen > len)
1492 return;
1493
1494 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1495 false, &elems);
1496
1497 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1498 }
1499
1500 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1501 struct sk_buff *skb)
1502 {
1503 struct ieee80211_rx_status *rx_status;
1504 struct ieee80211_mgmt *mgmt;
1505 u16 fc;
1506 struct ieee802_11_elems elems;
1507 int ies_len;
1508
1509 rx_status = IEEE80211_SKB_RXCB(skb);
1510 mgmt = (struct ieee80211_mgmt *) skb->data;
1511 fc = le16_to_cpu(mgmt->frame_control);
1512
1513 sdata_lock(sdata);
1514
1515 if (!sdata->u.ibss.ssid_len)
1516 goto mgmt_out; /* not ready to merge yet */
1517
1518 switch (fc & IEEE80211_FCTL_STYPE) {
1519 case IEEE80211_STYPE_PROBE_REQ:
1520 ieee80211_rx_mgmt_probe_req(sdata, skb);
1521 break;
1522 case IEEE80211_STYPE_PROBE_RESP:
1523 case IEEE80211_STYPE_BEACON:
1524 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1525 rx_status);
1526 break;
1527 case IEEE80211_STYPE_AUTH:
1528 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1529 break;
1530 case IEEE80211_STYPE_DEAUTH:
1531 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1532 break;
1533 case IEEE80211_STYPE_ACTION:
1534 switch (mgmt->u.action.category) {
1535 case WLAN_CATEGORY_SPECTRUM_MGMT:
1536 ies_len = skb->len -
1537 offsetof(struct ieee80211_mgmt,
1538 u.action.u.chan_switch.variable);
1539
1540 if (ies_len < 0)
1541 break;
1542
1543 ieee802_11_parse_elems(
1544 mgmt->u.action.u.chan_switch.variable,
1545 ies_len, true, &elems);
1546
1547 if (elems.parse_error)
1548 break;
1549
1550 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1551 rx_status, &elems);
1552 break;
1553 }
1554 }
1555
1556 mgmt_out:
1557 sdata_unlock(sdata);
1558 }
1559
1560 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1561 {
1562 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1563 struct sta_info *sta;
1564
1565 sdata_lock(sdata);
1566
1567 /*
1568 * Work could be scheduled after scan or similar
1569 * when we aren't even joined (or trying) with a
1570 * network.
1571 */
1572 if (!ifibss->ssid_len)
1573 goto out;
1574
1575 spin_lock_bh(&ifibss->incomplete_lock);
1576 while (!list_empty(&ifibss->incomplete_stations)) {
1577 sta = list_first_entry(&ifibss->incomplete_stations,
1578 struct sta_info, list);
1579 list_del(&sta->list);
1580 spin_unlock_bh(&ifibss->incomplete_lock);
1581
1582 ieee80211_ibss_finish_sta(sta);
1583 rcu_read_unlock();
1584 spin_lock_bh(&ifibss->incomplete_lock);
1585 }
1586 spin_unlock_bh(&ifibss->incomplete_lock);
1587
1588 switch (ifibss->state) {
1589 case IEEE80211_IBSS_MLME_SEARCH:
1590 ieee80211_sta_find_ibss(sdata);
1591 break;
1592 case IEEE80211_IBSS_MLME_JOINED:
1593 ieee80211_sta_merge_ibss(sdata);
1594 break;
1595 default:
1596 WARN_ON(1);
1597 break;
1598 }
1599
1600 out:
1601 sdata_unlock(sdata);
1602 }
1603
1604 static void ieee80211_ibss_timer(unsigned long data)
1605 {
1606 struct ieee80211_sub_if_data *sdata =
1607 (struct ieee80211_sub_if_data *) data;
1608
1609 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1610 }
1611
1612 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1613 {
1614 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1615
1616 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1617 (unsigned long) sdata);
1618 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1619 spin_lock_init(&ifibss->incomplete_lock);
1620 INIT_WORK(&ifibss->csa_connection_drop_work,
1621 ieee80211_csa_connection_drop_work);
1622 }
1623
1624 /* scan finished notification */
1625 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1626 {
1627 struct ieee80211_sub_if_data *sdata;
1628
1629 mutex_lock(&local->iflist_mtx);
1630 list_for_each_entry(sdata, &local->interfaces, list) {
1631 if (!ieee80211_sdata_running(sdata))
1632 continue;
1633 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1634 continue;
1635 sdata->u.ibss.last_scan_completed = jiffies;
1636 ieee80211_queue_work(&local->hw, &sdata->work);
1637 }
1638 mutex_unlock(&local->iflist_mtx);
1639 }
1640
1641 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1642 struct cfg80211_ibss_params *params)
1643 {
1644 u32 changed = 0;
1645 u32 rate_flags;
1646 struct ieee80211_supported_band *sband;
1647 int i;
1648
1649 if (params->bssid) {
1650 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1651 sdata->u.ibss.fixed_bssid = true;
1652 } else
1653 sdata->u.ibss.fixed_bssid = false;
1654
1655 sdata->u.ibss.privacy = params->privacy;
1656 sdata->u.ibss.control_port = params->control_port;
1657 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1658 sdata->u.ibss.basic_rates = params->basic_rates;
1659
1660 /* fix basic_rates if channel does not support these rates */
1661 rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1662 sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band];
1663 for (i = 0; i < sband->n_bitrates; i++) {
1664 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1665 sdata->u.ibss.basic_rates &= ~BIT(i);
1666 }
1667 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1668 sizeof(params->mcast_rate));
1669
1670 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1671
1672 sdata->u.ibss.chandef = params->chandef;
1673 sdata->u.ibss.fixed_channel = params->channel_fixed;
1674
1675 if (params->ie) {
1676 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1677 GFP_KERNEL);
1678 if (sdata->u.ibss.ie)
1679 sdata->u.ibss.ie_len = params->ie_len;
1680 }
1681
1682 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1683 sdata->u.ibss.ibss_join_req = jiffies;
1684
1685 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1686 sdata->u.ibss.ssid_len = params->ssid_len;
1687
1688 memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1689 sizeof(sdata->u.ibss.ht_capa));
1690 memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1691 sizeof(sdata->u.ibss.ht_capa_mask));
1692
1693 /*
1694 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1695 * reserved, but an HT STA shall protect HT transmissions as though
1696 * the HT Protection field were set to non-HT mixed mode.
1697 *
1698 * In an IBSS, the RIFS Mode field of the HT Operation element is
1699 * also reserved, but an HT STA shall operate as though this field
1700 * were set to 1.
1701 */
1702
1703 sdata->vif.bss_conf.ht_operation_mode |=
1704 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1705 | IEEE80211_HT_PARAM_RIFS_MODE;
1706
1707 changed |= BSS_CHANGED_HT;
1708 ieee80211_bss_info_change_notify(sdata, changed);
1709
1710 sdata->smps_mode = IEEE80211_SMPS_OFF;
1711 sdata->needed_rx_chains = sdata->local->rx_chains;
1712
1713 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1714
1715 return 0;
1716 }
1717
1718 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1719 {
1720 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1721
1722 ieee80211_ibss_disconnect(sdata);
1723 ifibss->ssid_len = 0;
1724 memset(ifibss->bssid, 0, ETH_ALEN);
1725
1726 /* remove beacon */
1727 kfree(sdata->u.ibss.ie);
1728
1729 /* on the next join, re-program HT parameters */
1730 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1731 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1732
1733 synchronize_rcu();
1734
1735 skb_queue_purge(&sdata->skb_queue);
1736
1737 del_timer_sync(&sdata->u.ibss.timer);
1738
1739 return 0;
1740 }
ubuntu-bionic-kernel mirror