1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * IBSS mode implementation
4 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
5 * Copyright 2004, Instant802 Networks, Inc.
6 * Copyright 2005, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
9 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
10 * Copyright 2013-2014 Intel Mobile Communications GmbH
11 * Copyright(c) 2016 Intel Deutschland GmbH
12 * Copyright(c) 2018-2023 Intel Corporation
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 *
ieee80211_ibss_build_presp(struct ieee80211_sub_if_data * sdata,const int beacon_int,const u32 basic_rates,const u16 capability,u64 tsf,struct cfg80211_chan_def * chandef,bool * have_higher_than_11mbit,struct cfg80211_csa_settings * csa_settings)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
55 /* Build IBSS probe response */
56 frame_len = sizeof(struct ieee80211_hdr_3addr) +
57 12 /* struct ieee80211_mgmt.u.beacon */ +
58 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
59 2 + 8 /* max Supported Rates */ +
60 3 /* max DS params */ +
61 4 /* IBSS params */ +
62 5 /* Channel Switch Announcement */ +
63 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
64 2 + sizeof(struct ieee80211_ht_cap) +
65 2 + sizeof(struct ieee80211_ht_operation) +
66 2 + sizeof(struct ieee80211_vht_cap) +
67 2 + sizeof(struct ieee80211_vht_operation) +
68 ifibss->ie_len;
69 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
70 if (!presp)
71 return NULL;
72
73 presp->head = (void *)(presp + 1);
74
75 mgmt = (void *) presp->head;
76 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
77 IEEE80211_STYPE_PROBE_RESP);
78 eth_broadcast_addr(mgmt->da);
79 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
80 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
81 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
82 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
83 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
84
85 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
86
87 *pos++ = WLAN_EID_SSID;
88 *pos++ = ifibss->ssid_len;
89 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
90 pos += ifibss->ssid_len;
91
92 sband = local->hw.wiphy->bands[chandef->chan->band];
93 rate_flags = ieee80211_chandef_rate_flags(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, 5);
113 u8 basic = 0;
114 if (!(rates & BIT(ri)))
115 continue;
116
117 if (basic_rates & BIT(ri))
118 basic = 0x80;
119 *pos++ = basic | (u8) rate;
120 if (++rates_added == 8) {
121 ri++; /* continue at next rate for EXT_SUPP_RATES */
122 break;
123 }
124 }
125
126 if (sband->band == NL80211_BAND_2GHZ) {
127 *pos++ = WLAN_EID_DS_PARAMS;
128 *pos++ = 1;
129 *pos++ = ieee80211_frequency_to_channel(
130 chandef->chan->center_freq);
131 }
132
133 *pos++ = WLAN_EID_IBSS_PARAMS;
134 *pos++ = 2;
135 /* FIX: set ATIM window based on scan results */
136 *pos++ = 0;
137 *pos++ = 0;
138
139 if (csa_settings) {
140 *pos++ = WLAN_EID_CHANNEL_SWITCH;
141 *pos++ = 3;
142 *pos++ = csa_settings->block_tx ? 1 : 0;
143 *pos++ = ieee80211_frequency_to_channel(
144 csa_settings->chandef.chan->center_freq);
145 presp->cntdwn_counter_offsets[0] = (pos - presp->head);
146 *pos++ = csa_settings->count;
147 presp->cntdwn_current_counter = 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, 5);
156 u8 basic = 0;
157 if (!(rates & BIT(ri)))
158 continue;
159
160 if (basic_rates & BIT(ri))
161 basic = 0x80;
162 *pos++ = basic | (u8) rate;
163 }
164 }
165
166 if (ifibss->ie_len) {
167 memcpy(pos, ifibss->ie, ifibss->ie_len);
168 pos += ifibss->ie_len;
169 }
170
171 /* add HT capability and information IEs */
172 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
173 chandef->width != NL80211_CHAN_WIDTH_5 &&
174 chandef->width != NL80211_CHAN_WIDTH_10 &&
175 sband->ht_cap.ht_supported) {
176 struct ieee80211_sta_ht_cap ht_cap;
177
178 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
179 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
180
181 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
182 /*
183 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
184 * field and RIFS Mode are reserved in IBSS mode, therefore
185 * keep them at 0
186 */
187 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
188 chandef, 0, false);
189
190 /* add VHT capability and information IEs */
191 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
192 chandef->width != NL80211_CHAN_WIDTH_40 &&
193 sband->vht_cap.vht_supported) {
194 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
195 sband->vht_cap.cap);
196 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
197 chandef);
198 }
199 }
200
201 if (local->hw.queues >= IEEE80211_NUM_ACS)
202 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
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
__ieee80211_sta_join_ibss(struct ieee80211_sub_if_data * sdata,const u8 * bssid,const int beacon_int,struct cfg80211_chan_def * req_chandef,const u32 basic_rates,const u16 capability,u64 tsf,bool creator)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 u64 bss_change;
226 struct ieee80211_chan_req chanreq = {};
227 struct ieee80211_channel *chan;
228 struct beacon_data *presp;
229 struct cfg80211_inform_bss bss_meta = {};
230 bool have_higher_than_11mbit;
231 bool radar_required;
232 int err;
233
234 lockdep_assert_wiphy(local->hw.wiphy);
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, -1);
241
242 /* if merging, indicate to driver that we leave the old IBSS */
243 if (sdata->vif.cfg.ibss_joined) {
244 sdata->vif.cfg.ibss_joined = false;
245 sdata->vif.cfg.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 = sdata_dereference(ifibss->presp, sdata);
255 RCU_INIT_POINTER(ifibss->presp, NULL);
256 if (presp)
257 kfree_rcu(presp, rcu_head);
258
259 /* make a copy of the chandef, it could be modified below. */
260 chanreq.oper = *req_chandef;
261 chan = chanreq.oper.chan;
262 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chanreq.oper,
263 NL80211_IFTYPE_ADHOC)) {
264 if (chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
265 chanreq.oper.width == NL80211_CHAN_WIDTH_10 ||
266 chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
267 chanreq.oper.width == NL80211_CHAN_WIDTH_20) {
268 sdata_info(sdata,
269 "Failed to join IBSS, beacons forbidden\n");
270 return;
271 }
272 chanreq.oper.width = NL80211_CHAN_WIDTH_20;
273 chanreq.oper.center_freq1 = chan->center_freq;
274 /* check again for downgraded chandef */
275 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chanreq.oper,
276 NL80211_IFTYPE_ADHOC)) {
277 sdata_info(sdata,
278 "Failed to join IBSS, beacons forbidden\n");
279 return;
280 }
281 }
282
283 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
284 &chanreq.oper, NL80211_IFTYPE_ADHOC);
285 if (err < 0) {
286 sdata_info(sdata,
287 "Failed to join IBSS, invalid chandef\n");
288 return;
289 }
290 if (err > 0 && !ifibss->userspace_handles_dfs) {
291 sdata_info(sdata,
292 "Failed to join IBSS, DFS channel without control program\n");
293 return;
294 }
295
296 radar_required = err;
297
298 if (ieee80211_link_use_channel(&sdata->deflink, &chanreq,
299 ifibss->fixed_channel ?
300 IEEE80211_CHANCTX_SHARED :
301 IEEE80211_CHANCTX_EXCLUSIVE)) {
302 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
303 return;
304 }
305 sdata->deflink.radar_required = radar_required;
306
307 memcpy(ifibss->bssid, bssid, ETH_ALEN);
308
309 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
310 capability, tsf, &chanreq.oper,
311 &have_higher_than_11mbit, NULL);
312 if (!presp)
313 return;
314
315 rcu_assign_pointer(ifibss->presp, presp);
316 mgmt = (void *)presp->head;
317
318 sdata->vif.bss_conf.enable_beacon = true;
319 sdata->vif.bss_conf.beacon_int = beacon_int;
320 sdata->vif.bss_conf.basic_rates = basic_rates;
321 sdata->vif.cfg.ssid_len = ifibss->ssid_len;
322 memcpy(sdata->vif.cfg.ssid, ifibss->ssid, ifibss->ssid_len);
323 bss_change = BSS_CHANGED_BEACON_INT;
324 bss_change |= ieee80211_reset_erp_info(sdata);
325 bss_change |= BSS_CHANGED_BSSID;
326 bss_change |= BSS_CHANGED_BEACON;
327 bss_change |= BSS_CHANGED_BEACON_ENABLED;
328 bss_change |= BSS_CHANGED_BASIC_RATES;
329 bss_change |= BSS_CHANGED_HT;
330 bss_change |= BSS_CHANGED_IBSS;
331 bss_change |= BSS_CHANGED_SSID;
332
333 /*
334 * In 5 GHz/802.11a, we can always use short slot time.
335 * (IEEE 802.11-2012 18.3.8.7)
336 *
337 * In 2.4GHz, we must always use long slots in IBSS for compatibility
338 * reasons.
339 * (IEEE 802.11-2012 19.4.5)
340 *
341 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
342 */
343 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ;
344 bss_change |= BSS_CHANGED_ERP_SLOT;
345
346 /* cf. IEEE 802.11 9.2.12 */
347 sdata->deflink.operating_11g_mode =
348 chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit;
349
350 ieee80211_set_wmm_default(&sdata->deflink, true, false);
351
352 sdata->vif.cfg.ibss_joined = true;
353 sdata->vif.cfg.ibss_creator = creator;
354
355 err = drv_join_ibss(local, sdata);
356 if (err) {
357 sdata->vif.cfg.ibss_joined = false;
358 sdata->vif.cfg.ibss_creator = false;
359 sdata->vif.bss_conf.enable_beacon = false;
360 sdata->vif.cfg.ssid_len = 0;
361 RCU_INIT_POINTER(ifibss->presp, NULL);
362 kfree_rcu(presp, rcu_head);
363 ieee80211_link_release_channel(&sdata->deflink);
364 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
365 err);
366 return;
367 }
368
369 ieee80211_bss_info_change_notify(sdata, bss_change);
370
371 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
372 mod_timer(&ifibss->timer,
373 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
374
375 bss_meta.chan = chan;
376 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
377 presp->head_len, GFP_KERNEL);
378
379 cfg80211_put_bss(local->hw.wiphy, bss);
380 netif_carrier_on(sdata->dev);
381 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
382 }
383
ieee80211_sta_join_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_bss * bss)384 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
385 struct ieee80211_bss *bss)
386 {
387 struct cfg80211_bss *cbss =
388 container_of((void *)bss, struct cfg80211_bss, priv);
389 struct ieee80211_supported_band *sband;
390 struct cfg80211_chan_def chandef;
391 u32 basic_rates;
392 int i, j;
393 u16 beacon_int = cbss->beacon_interval;
394 const struct cfg80211_bss_ies *ies;
395 enum nl80211_channel_type chan_type;
396 u64 tsf;
397 u32 rate_flags;
398
399 lockdep_assert_wiphy(sdata->local->hw.wiphy);
400
401 if (beacon_int < 10)
402 beacon_int = 10;
403
404 switch (sdata->u.ibss.chandef.width) {
405 case NL80211_CHAN_WIDTH_20_NOHT:
406 case NL80211_CHAN_WIDTH_20:
407 case NL80211_CHAN_WIDTH_40:
408 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
409 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
410 break;
411 case NL80211_CHAN_WIDTH_5:
412 case NL80211_CHAN_WIDTH_10:
413 cfg80211_chandef_create(&chandef, cbss->channel,
414 NL80211_CHAN_NO_HT);
415 chandef.width = sdata->u.ibss.chandef.width;
416 break;
417 case NL80211_CHAN_WIDTH_80:
418 case NL80211_CHAN_WIDTH_80P80:
419 case NL80211_CHAN_WIDTH_160:
420 chandef = sdata->u.ibss.chandef;
421 chandef.chan = cbss->channel;
422 break;
423 default:
424 /* fall back to 20 MHz for unsupported modes */
425 cfg80211_chandef_create(&chandef, cbss->channel,
426 NL80211_CHAN_NO_HT);
427 break;
428 }
429
430 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
431 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
432
433 basic_rates = 0;
434
435 for (i = 0; i < bss->supp_rates_len; i++) {
436 int rate = bss->supp_rates[i] & 0x7f;
437 bool is_basic = !!(bss->supp_rates[i] & 0x80);
438
439 for (j = 0; j < sband->n_bitrates; j++) {
440 int brate;
441 if ((rate_flags & sband->bitrates[j].flags)
442 != rate_flags)
443 continue;
444
445 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 5);
446 if (brate == rate) {
447 if (is_basic)
448 basic_rates |= BIT(j);
449 break;
450 }
451 }
452 }
453
454 rcu_read_lock();
455 ies = rcu_dereference(cbss->ies);
456 tsf = ies->tsf;
457 rcu_read_unlock();
458
459 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
460 beacon_int,
461 &chandef,
462 basic_rates,
463 cbss->capability,
464 tsf, false);
465 }
466
ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data * sdata,struct cfg80211_csa_settings * csa_settings,u64 * changed)467 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
468 struct cfg80211_csa_settings *csa_settings,
469 u64 *changed)
470 {
471 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
472 struct beacon_data *presp, *old_presp;
473 struct cfg80211_bss *cbss;
474 const struct cfg80211_bss_ies *ies;
475 u16 capability = WLAN_CAPABILITY_IBSS;
476 u64 tsf;
477
478 lockdep_assert_wiphy(sdata->local->hw.wiphy);
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, IEEE80211_BSS_TYPE_IBSS,
486 IEEE80211_PRIVACY(ifibss->privacy));
487
488 if (unlikely(!cbss))
489 return -EINVAL;
490
491 rcu_read_lock();
492 ies = rcu_dereference(cbss->ies);
493 tsf = ies->tsf;
494 rcu_read_unlock();
495 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
496
497 old_presp = sdata_dereference(ifibss->presp, sdata);
498
499 presp = ieee80211_ibss_build_presp(sdata,
500 sdata->vif.bss_conf.beacon_int,
501 sdata->vif.bss_conf.basic_rates,
502 capability, tsf, &ifibss->chandef,
503 NULL, csa_settings);
504 if (!presp)
505 return -ENOMEM;
506
507 rcu_assign_pointer(ifibss->presp, presp);
508 if (old_presp)
509 kfree_rcu(old_presp, rcu_head);
510
511 *changed |= BSS_CHANGED_BEACON;
512 return 0;
513 }
514
ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data * sdata,u64 * changed)515 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata, u64 *changed)
516 {
517 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
518 struct cfg80211_bss *cbss;
519
520 lockdep_assert_wiphy(sdata->local->hw.wiphy);
521
522 /* When not connected/joined, sending CSA doesn't make sense. */
523 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED)
524 return -ENOLINK;
525
526 /* update cfg80211 bss information with the new channel */
527 if (!is_zero_ether_addr(ifibss->bssid)) {
528 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
529 ifibss->chandef.chan,
530 ifibss->bssid, ifibss->ssid,
531 ifibss->ssid_len,
532 IEEE80211_BSS_TYPE_IBSS,
533 IEEE80211_PRIVACY(ifibss->privacy));
534 /* XXX: should not really modify cfg80211 data */
535 if (cbss) {
536 cbss->channel = sdata->deflink.csa_chanreq.oper.chan;
537 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
538 }
539 }
540
541 ifibss->chandef = sdata->deflink.csa_chanreq.oper;
542
543 /* generate the beacon */
544 return ieee80211_ibss_csa_beacon(sdata, NULL, changed);
545 }
546
ieee80211_ibss_stop(struct ieee80211_sub_if_data * sdata)547 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
548 {
549 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
550
551 wiphy_work_cancel(sdata->local->hw.wiphy,
552 &ifibss->csa_connection_drop_work);
553 }
554
ieee80211_ibss_finish_sta(struct sta_info * sta)555 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
556 __acquires(RCU)
557 {
558 struct ieee80211_sub_if_data *sdata = sta->sdata;
559 u8 addr[ETH_ALEN];
560
561 memcpy(addr, sta->sta.addr, ETH_ALEN);
562
563 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
564
565 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
566 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
567 /* authorize the station only if the network is not RSN protected. If
568 * not wait for the userspace to authorize it */
569 if (!sta->sdata->u.ibss.control_port)
570 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
571
572 rate_control_rate_init(sta);
573
574 /* If it fails, maybe we raced another insertion? */
575 if (sta_info_insert_rcu(sta))
576 return sta_info_get(sdata, addr);
577 return sta;
578 }
579
580 static struct sta_info *
ieee80211_ibss_add_sta(struct ieee80211_sub_if_data * sdata,const u8 * bssid,const u8 * addr,u32 supp_rates)581 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
582 const u8 *addr, u32 supp_rates)
583 __acquires(RCU)
584 {
585 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
586 struct ieee80211_local *local = sdata->local;
587 struct sta_info *sta;
588 struct ieee80211_chanctx_conf *chanctx_conf;
589 struct ieee80211_supported_band *sband;
590 int band;
591
592 /*
593 * XXX: Consider removing the least recently used entry and
594 * allow new one to be added.
595 */
596 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
597 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
598 sdata->name, addr);
599 rcu_read_lock();
600 return NULL;
601 }
602
603 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
604 rcu_read_lock();
605 return NULL;
606 }
607
608 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
609 rcu_read_lock();
610 return NULL;
611 }
612
613 rcu_read_lock();
614 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
615 if (WARN_ON_ONCE(!chanctx_conf))
616 return NULL;
617 band = chanctx_conf->def.chan->band;
618 rcu_read_unlock();
619
620 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
621 if (!sta) {
622 rcu_read_lock();
623 return NULL;
624 }
625
626 /* make sure mandatory rates are always added */
627 sband = local->hw.wiphy->bands[band];
628 sta->sta.deflink.supp_rates[band] = supp_rates |
629 ieee80211_mandatory_rates(sband);
630
631 return ieee80211_ibss_finish_sta(sta);
632 }
633
ieee80211_sta_active_ibss(struct ieee80211_sub_if_data * sdata)634 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
635 {
636 struct ieee80211_local *local = sdata->local;
637 int active = 0;
638 struct sta_info *sta;
639
640 lockdep_assert_wiphy(sdata->local->hw.wiphy);
641
642 rcu_read_lock();
643
644 list_for_each_entry_rcu(sta, &local->sta_list, list) {
645 unsigned long last_active = ieee80211_sta_last_active(sta);
646
647 if (sta->sdata == sdata &&
648 time_is_after_jiffies(last_active +
649 IEEE80211_IBSS_MERGE_INTERVAL)) {
650 active++;
651 break;
652 }
653 }
654
655 rcu_read_unlock();
656
657 return active;
658 }
659
ieee80211_ibss_disconnect(struct ieee80211_sub_if_data * sdata)660 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
661 {
662 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
663 struct ieee80211_local *local = sdata->local;
664 struct cfg80211_bss *cbss;
665 struct beacon_data *presp;
666 struct sta_info *sta;
667
668 lockdep_assert_wiphy(local->hw.wiphy);
669
670 if (!is_zero_ether_addr(ifibss->bssid)) {
671 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
672 ifibss->bssid, ifibss->ssid,
673 ifibss->ssid_len,
674 IEEE80211_BSS_TYPE_IBSS,
675 IEEE80211_PRIVACY(ifibss->privacy));
676
677 if (cbss) {
678 cfg80211_unlink_bss(local->hw.wiphy, cbss);
679 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
680 }
681 }
682
683 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
684
685 sta_info_flush(sdata, -1);
686
687 spin_lock_bh(&ifibss->incomplete_lock);
688 while (!list_empty(&ifibss->incomplete_stations)) {
689 sta = list_first_entry(&ifibss->incomplete_stations,
690 struct sta_info, list);
691 list_del(&sta->list);
692 spin_unlock_bh(&ifibss->incomplete_lock);
693
694 sta_info_free(local, sta);
695 spin_lock_bh(&ifibss->incomplete_lock);
696 }
697 spin_unlock_bh(&ifibss->incomplete_lock);
698
699 netif_carrier_off(sdata->dev);
700
701 sdata->vif.cfg.ibss_joined = false;
702 sdata->vif.cfg.ibss_creator = false;
703 sdata->vif.bss_conf.enable_beacon = false;
704 sdata->vif.cfg.ssid_len = 0;
705
706 /* remove beacon */
707 presp = sdata_dereference(ifibss->presp, sdata);
708 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
709 if (presp)
710 kfree_rcu(presp, rcu_head);
711
712 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
713 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
714 BSS_CHANGED_IBSS);
715 drv_leave_ibss(local, sdata);
716 ieee80211_link_release_channel(&sdata->deflink);
717 }
718
ieee80211_csa_connection_drop_work(struct wiphy * wiphy,struct wiphy_work * work)719 static void ieee80211_csa_connection_drop_work(struct wiphy *wiphy,
720 struct wiphy_work *work)
721 {
722 struct ieee80211_sub_if_data *sdata =
723 container_of(work, struct ieee80211_sub_if_data,
724 u.ibss.csa_connection_drop_work);
725
726 ieee80211_ibss_disconnect(sdata);
727 synchronize_rcu();
728 skb_queue_purge(&sdata->skb_queue);
729
730 /* trigger a scan to find another IBSS network to join */
731 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
732 }
733
ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data * sdata)734 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
735 {
736 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
737 int err;
738
739 /* if the current channel is a DFS channel, mark the channel as
740 * unavailable.
741 */
742 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
743 &ifibss->chandef,
744 NL80211_IFTYPE_ADHOC);
745 if (err > 0)
746 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
747 GFP_ATOMIC);
748 }
749
750 static bool
ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * elems,bool beacon)751 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
752 struct ieee802_11_elems *elems,
753 bool beacon)
754 {
755 struct cfg80211_csa_settings params;
756 struct ieee80211_csa_ie csa_ie;
757 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
758 enum nl80211_channel_type ch_type;
759 int err;
760 struct ieee80211_conn_settings conn = {
761 .mode = IEEE80211_CONN_MODE_HT,
762 .bw_limit = IEEE80211_CONN_BW_LIMIT_40,
763 };
764 u32 vht_cap_info = 0;
765
766 lockdep_assert_wiphy(sdata->local->hw.wiphy);
767
768 switch (ifibss->chandef.width) {
769 case NL80211_CHAN_WIDTH_5:
770 case NL80211_CHAN_WIDTH_10:
771 case NL80211_CHAN_WIDTH_20_NOHT:
772 conn.mode = IEEE80211_CONN_MODE_LEGACY;
773 fallthrough;
774 case NL80211_CHAN_WIDTH_20:
775 conn.bw_limit = IEEE80211_CONN_BW_LIMIT_20;
776 break;
777 default:
778 break;
779 }
780
781 if (elems->vht_cap_elem)
782 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
783
784 memset(¶ms, 0, sizeof(params));
785 err = ieee80211_parse_ch_switch_ie(sdata, elems,
786 ifibss->chandef.chan->band,
787 vht_cap_info, &conn,
788 ifibss->bssid, &csa_ie);
789 /* can't switch to destination channel, fail */
790 if (err < 0)
791 goto disconnect;
792
793 /* did not contain a CSA */
794 if (err)
795 return false;
796
797 /* channel switch is not supported, disconnect */
798 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
799 goto disconnect;
800
801 params.count = csa_ie.count;
802 params.chandef = csa_ie.chanreq.oper;
803
804 switch (ifibss->chandef.width) {
805 case NL80211_CHAN_WIDTH_20_NOHT:
806 case NL80211_CHAN_WIDTH_20:
807 case NL80211_CHAN_WIDTH_40:
808 /* keep our current HT mode (HT20/HT40+/HT40-), even if
809 * another mode has been announced. The mode is not adopted
810 * within the beacon while doing CSA and we should therefore
811 * keep the mode which we announce.
812 */
813 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
814 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
815 ch_type);
816 break;
817 case NL80211_CHAN_WIDTH_5:
818 case NL80211_CHAN_WIDTH_10:
819 if (params.chandef.width != ifibss->chandef.width) {
820 sdata_info(sdata,
821 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
822 ifibss->bssid,
823 params.chandef.chan->center_freq,
824 params.chandef.width,
825 params.chandef.center_freq1,
826 params.chandef.center_freq2);
827 goto disconnect;
828 }
829 break;
830 default:
831 /* should not happen, conn_flags should prevent VHT modes. */
832 WARN_ON(1);
833 goto disconnect;
834 }
835
836 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
837 NL80211_IFTYPE_ADHOC)) {
838 sdata_info(sdata,
839 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
840 ifibss->bssid,
841 params.chandef.chan->center_freq,
842 params.chandef.width,
843 params.chandef.center_freq1,
844 params.chandef.center_freq2);
845 goto disconnect;
846 }
847
848 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
849 ¶ms.chandef,
850 NL80211_IFTYPE_ADHOC);
851 if (err < 0)
852 goto disconnect;
853 if (err > 0 && !ifibss->userspace_handles_dfs) {
854 /* IBSS-DFS only allowed with a control program */
855 goto disconnect;
856 }
857
858 params.radar_required = err;
859
860 if (cfg80211_chandef_identical(¶ms.chandef,
861 &sdata->vif.bss_conf.chanreq.oper)) {
862 ibss_dbg(sdata,
863 "received csa with an identical chandef, ignoring\n");
864 return true;
865 }
866
867 /* all checks done, now perform the channel switch. */
868 ibss_dbg(sdata,
869 "received channel switch announcement to go to channel %d MHz\n",
870 params.chandef.chan->center_freq);
871
872 params.block_tx = !!csa_ie.mode;
873
874 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
875 ¶ms))
876 goto disconnect;
877
878 ieee80211_ibss_csa_mark_radar(sdata);
879
880 return true;
881 disconnect:
882 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
883 wiphy_work_queue(sdata->local->hw.wiphy,
884 &ifibss->csa_connection_drop_work);
885
886 ieee80211_ibss_csa_mark_radar(sdata);
887
888 return true;
889 }
890
891 static void
ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status,struct ieee802_11_elems * elems)892 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
893 struct ieee80211_mgmt *mgmt, size_t len,
894 struct ieee80211_rx_status *rx_status,
895 struct ieee802_11_elems *elems)
896 {
897 int required_len;
898
899 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
900 return;
901
902 /* CSA is the only action we handle for now */
903 if (mgmt->u.action.u.measurement.action_code !=
904 WLAN_ACTION_SPCT_CHL_SWITCH)
905 return;
906
907 required_len = IEEE80211_MIN_ACTION_SIZE +
908 sizeof(mgmt->u.action.u.chan_switch);
909 if (len < required_len)
910 return;
911
912 if (!sdata->vif.bss_conf.csa_active)
913 ieee80211_ibss_process_chanswitch(sdata, elems, false);
914 }
915
ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)916 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
917 struct ieee80211_mgmt *mgmt,
918 size_t len)
919 {
920 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
921
922 if (len < IEEE80211_DEAUTH_FRAME_LEN)
923 return;
924
925 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
926 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
927 sta_info_destroy_addr(sdata, mgmt->sa);
928 }
929
ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)930 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
931 struct ieee80211_mgmt *mgmt,
932 size_t len)
933 {
934 u16 auth_alg, auth_transaction;
935
936 lockdep_assert_wiphy(sdata->local->hw.wiphy);
937
938 if (len < 24 + 6)
939 return;
940
941 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
942 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
943
944 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
945 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
946 mgmt->bssid, auth_transaction);
947
948 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
949 return;
950
951 /*
952 * IEEE 802.11 standard does not require authentication in IBSS
953 * networks and most implementations do not seem to use it.
954 * However, try to reply to authentication attempts if someone
955 * has actually implemented this.
956 */
957 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
958 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
959 }
960
ieee80211_update_sta_info(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status,struct ieee802_11_elems * elems,struct ieee80211_channel * channel)961 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
962 struct ieee80211_mgmt *mgmt, size_t len,
963 struct ieee80211_rx_status *rx_status,
964 struct ieee802_11_elems *elems,
965 struct ieee80211_channel *channel)
966 {
967 struct sta_info *sta;
968 enum nl80211_band band = rx_status->band;
969 struct ieee80211_local *local = sdata->local;
970 struct ieee80211_supported_band *sband;
971 bool rates_updated = false;
972 u32 supp_rates = 0;
973
974 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
975 return;
976
977 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
978 return;
979
980 sband = local->hw.wiphy->bands[band];
981 if (WARN_ON(!sband))
982 return;
983
984 rcu_read_lock();
985 sta = sta_info_get(sdata, mgmt->sa);
986
987 if (elems->supp_rates) {
988 supp_rates = ieee80211_sta_get_rates(sdata, elems,
989 band, NULL);
990 if (sta) {
991 u32 prev_rates;
992
993 prev_rates = sta->sta.deflink.supp_rates[band];
994
995 sta->sta.deflink.supp_rates[band] = supp_rates |
996 ieee80211_mandatory_rates(sband);
997 if (sta->sta.deflink.supp_rates[band] != prev_rates) {
998 ibss_dbg(sdata,
999 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1000 sta->sta.addr, prev_rates,
1001 sta->sta.deflink.supp_rates[band]);
1002 rates_updated = true;
1003 }
1004 } else {
1005 rcu_read_unlock();
1006 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1007 mgmt->sa, supp_rates);
1008 }
1009 }
1010
1011 if (sta && !sta->sta.wme &&
1012 (elems->wmm_info || elems->s1g_capab) &&
1013 local->hw.queues >= IEEE80211_NUM_ACS) {
1014 sta->sta.wme = true;
1015 ieee80211_check_fast_xmit(sta);
1016 }
1017
1018 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1019 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1020 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1021 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1022 /* we both use HT */
1023 struct ieee80211_ht_cap htcap_ie;
1024 struct cfg80211_chan_def chandef;
1025 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
1026
1027 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1028 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1029
1030 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1031 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1032 &htcap_ie,
1033 &sta->deflink);
1034
1035 if (elems->vht_operation && elems->vht_cap_elem &&
1036 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1037 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1038 /* we both use VHT */
1039 struct ieee80211_vht_cap cap_ie;
1040 struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap;
1041 u32 vht_cap_info =
1042 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1043
1044 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info,
1045 elems->vht_operation,
1046 elems->ht_operation,
1047 &chandef);
1048 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1049 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1050 &cap_ie, NULL,
1051 &sta->deflink);
1052 if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap)))
1053 rates_updated |= true;
1054 }
1055
1056 if (bw != sta->sta.deflink.bandwidth)
1057 rates_updated |= true;
1058
1059 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1060 &chandef))
1061 WARN_ON_ONCE(1);
1062 }
1063
1064 if (sta && rates_updated) {
1065 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1066 u8 rx_nss = sta->sta.deflink.rx_nss;
1067
1068 /* Force rx_nss recalculation */
1069 sta->sta.deflink.rx_nss = 0;
1070 rate_control_rate_init(sta);
1071 if (sta->sta.deflink.rx_nss != rx_nss)
1072 changed |= IEEE80211_RC_NSS_CHANGED;
1073
1074 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1075 }
1076
1077 rcu_read_unlock();
1078 }
1079
ieee80211_rx_bss_info(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status,struct ieee802_11_elems * elems)1080 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1081 struct ieee80211_mgmt *mgmt, size_t len,
1082 struct ieee80211_rx_status *rx_status,
1083 struct ieee802_11_elems *elems)
1084 {
1085 struct ieee80211_local *local = sdata->local;
1086 struct cfg80211_bss *cbss;
1087 struct ieee80211_bss *bss;
1088 struct ieee80211_channel *channel;
1089 u64 beacon_timestamp, rx_timestamp;
1090 u32 supp_rates = 0;
1091 enum nl80211_band band = rx_status->band;
1092
1093 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1094 if (!channel)
1095 return;
1096
1097 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1098
1099 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1100 if (!bss)
1101 return;
1102
1103 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1104
1105 /* same for beacon and probe response */
1106 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1107
1108 /* check if we need to merge IBSS */
1109
1110 /* not an IBSS */
1111 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1112 goto put_bss;
1113
1114 /* different channel */
1115 if (sdata->u.ibss.fixed_channel &&
1116 sdata->u.ibss.chandef.chan != cbss->channel)
1117 goto put_bss;
1118
1119 /* different SSID */
1120 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1121 memcmp(elems->ssid, sdata->u.ibss.ssid,
1122 sdata->u.ibss.ssid_len))
1123 goto put_bss;
1124
1125 /* process channel switch */
1126 if (sdata->vif.bss_conf.csa_active ||
1127 ieee80211_ibss_process_chanswitch(sdata, elems, true))
1128 goto put_bss;
1129
1130 /* same BSSID */
1131 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1132 goto put_bss;
1133
1134 /* we use a fixed BSSID */
1135 if (sdata->u.ibss.fixed_bssid)
1136 goto put_bss;
1137
1138 if (ieee80211_have_rx_timestamp(rx_status)) {
1139 /* time when timestamp field was received */
1140 rx_timestamp =
1141 ieee80211_calculate_rx_timestamp(local, rx_status,
1142 len + FCS_LEN, 24);
1143 } else {
1144 /*
1145 * second best option: get current TSF
1146 * (will return -1 if not supported)
1147 */
1148 rx_timestamp = drv_get_tsf(local, sdata);
1149 }
1150
1151 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1152 mgmt->sa, mgmt->bssid,
1153 (unsigned long long)rx_timestamp);
1154 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1155 (unsigned long long)beacon_timestamp,
1156 (unsigned long long)(rx_timestamp - beacon_timestamp),
1157 jiffies);
1158
1159 if (beacon_timestamp > rx_timestamp) {
1160 ibss_dbg(sdata,
1161 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1162 mgmt->bssid);
1163 ieee80211_sta_join_ibss(sdata, bss);
1164 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1165 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1166 supp_rates);
1167 rcu_read_unlock();
1168 }
1169
1170 put_bss:
1171 ieee80211_rx_bss_put(local, bss);
1172 }
1173
ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data * sdata,const u8 * bssid,const u8 * addr,u32 supp_rates)1174 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1175 const u8 *bssid, const u8 *addr,
1176 u32 supp_rates)
1177 {
1178 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1179 struct ieee80211_local *local = sdata->local;
1180 struct sta_info *sta;
1181 struct ieee80211_chanctx_conf *chanctx_conf;
1182 struct ieee80211_supported_band *sband;
1183 int band;
1184
1185 /*
1186 * XXX: Consider removing the least recently used entry and
1187 * allow new one to be added.
1188 */
1189 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1190 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1191 sdata->name, addr);
1192 return;
1193 }
1194
1195 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1196 return;
1197
1198 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1199 return;
1200
1201 rcu_read_lock();
1202 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
1203 if (WARN_ON_ONCE(!chanctx_conf)) {
1204 rcu_read_unlock();
1205 return;
1206 }
1207 band = chanctx_conf->def.chan->band;
1208 rcu_read_unlock();
1209
1210 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1211 if (!sta)
1212 return;
1213
1214 /* make sure mandatory rates are always added */
1215 sband = local->hw.wiphy->bands[band];
1216 sta->sta.deflink.supp_rates[band] = supp_rates |
1217 ieee80211_mandatory_rates(sband);
1218
1219 spin_lock(&ifibss->incomplete_lock);
1220 list_add(&sta->list, &ifibss->incomplete_stations);
1221 spin_unlock(&ifibss->incomplete_lock);
1222 wiphy_work_queue(local->hw.wiphy, &sdata->work);
1223 }
1224
ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data * sdata)1225 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1226 {
1227 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1228 struct ieee80211_local *local = sdata->local;
1229 struct sta_info *sta, *tmp;
1230 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1231 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1232
1233 lockdep_assert_wiphy(local->hw.wiphy);
1234
1235 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1236 unsigned long last_active = ieee80211_sta_last_active(sta);
1237
1238 if (sdata != sta->sdata)
1239 continue;
1240
1241 if (time_is_before_jiffies(last_active + exp_time) ||
1242 (time_is_before_jiffies(last_active + exp_rsn) &&
1243 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1244 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1245
1246 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1247 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1248 "not authorized " : "", sta->sta.addr);
1249
1250 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1251 ifibss->bssid,
1252 IEEE80211_STYPE_DEAUTH,
1253 WLAN_REASON_DEAUTH_LEAVING,
1254 true, frame_buf);
1255 WARN_ON(__sta_info_destroy(sta));
1256 }
1257 }
1258 }
1259
1260 /*
1261 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1262 */
1263
ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data * sdata)1264 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1265 {
1266 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1267
1268 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1269
1270 mod_timer(&ifibss->timer,
1271 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1272
1273 ieee80211_ibss_sta_expire(sdata);
1274
1275 if (time_before(jiffies, ifibss->last_scan_completed +
1276 IEEE80211_IBSS_MERGE_INTERVAL))
1277 return;
1278
1279 if (ieee80211_sta_active_ibss(sdata))
1280 return;
1281
1282 if (ifibss->fixed_channel)
1283 return;
1284
1285 sdata_info(sdata,
1286 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1287
1288 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1289 NULL, 0);
1290 }
1291
ieee80211_sta_create_ibss(struct ieee80211_sub_if_data * sdata)1292 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1293 {
1294 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1295 u8 bssid[ETH_ALEN];
1296 u16 capability;
1297 int i;
1298
1299 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1300
1301 if (ifibss->fixed_bssid) {
1302 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1303 } else {
1304 /* Generate random, not broadcast, locally administered BSSID. Mix in
1305 * own MAC address to make sure that devices that do not have proper
1306 * random number generator get different BSSID. */
1307 get_random_bytes(bssid, ETH_ALEN);
1308 for (i = 0; i < ETH_ALEN; i++)
1309 bssid[i] ^= sdata->vif.addr[i];
1310 bssid[0] &= ~0x01;
1311 bssid[0] |= 0x02;
1312 }
1313
1314 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1315
1316 capability = WLAN_CAPABILITY_IBSS;
1317
1318 if (ifibss->privacy)
1319 capability |= WLAN_CAPABILITY_PRIVACY;
1320
1321 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1322 &ifibss->chandef, ifibss->basic_rates,
1323 capability, 0, true);
1324 }
1325
ibss_setup_channels(struct wiphy * wiphy,struct ieee80211_channel ** channels,unsigned int channels_max,u32 center_freq,u32 width)1326 static unsigned int ibss_setup_channels(struct wiphy *wiphy,
1327 struct ieee80211_channel **channels,
1328 unsigned int channels_max,
1329 u32 center_freq, u32 width)
1330 {
1331 struct ieee80211_channel *chan = NULL;
1332 unsigned int n_chan = 0;
1333 u32 start_freq, end_freq, freq;
1334
1335 if (width <= 20) {
1336 start_freq = center_freq;
1337 end_freq = center_freq;
1338 } else {
1339 start_freq = center_freq - width / 2 + 10;
1340 end_freq = center_freq + width / 2 - 10;
1341 }
1342
1343 for (freq = start_freq; freq <= end_freq; freq += 20) {
1344 chan = ieee80211_get_channel(wiphy, freq);
1345 if (!chan)
1346 continue;
1347 if (n_chan >= channels_max)
1348 return n_chan;
1349
1350 channels[n_chan] = chan;
1351 n_chan++;
1352 }
1353
1354 return n_chan;
1355 }
1356
1357 static unsigned int
ieee80211_ibss_setup_scan_channels(struct wiphy * wiphy,const struct cfg80211_chan_def * chandef,struct ieee80211_channel ** channels,unsigned int channels_max)1358 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1359 const struct cfg80211_chan_def *chandef,
1360 struct ieee80211_channel **channels,
1361 unsigned int channels_max)
1362 {
1363 unsigned int n_chan = 0;
1364 u32 width, cf1, cf2 = 0;
1365
1366 switch (chandef->width) {
1367 case NL80211_CHAN_WIDTH_40:
1368 width = 40;
1369 break;
1370 case NL80211_CHAN_WIDTH_80P80:
1371 cf2 = chandef->center_freq2;
1372 fallthrough;
1373 case NL80211_CHAN_WIDTH_80:
1374 width = 80;
1375 break;
1376 case NL80211_CHAN_WIDTH_160:
1377 width = 160;
1378 break;
1379 default:
1380 width = 20;
1381 break;
1382 }
1383
1384 cf1 = chandef->center_freq1;
1385
1386 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1387
1388 if (cf2)
1389 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1390 channels_max - n_chan, cf2,
1391 width);
1392
1393 return n_chan;
1394 }
1395
1396 /*
1397 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1398 */
1399
ieee80211_sta_find_ibss(struct ieee80211_sub_if_data * sdata)1400 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1401 {
1402 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1403 struct ieee80211_local *local = sdata->local;
1404 struct cfg80211_bss *cbss;
1405 struct ieee80211_channel *chan = NULL;
1406 const u8 *bssid = NULL;
1407 int active_ibss;
1408
1409 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1410
1411 active_ibss = ieee80211_sta_active_ibss(sdata);
1412 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1413
1414 if (active_ibss)
1415 return;
1416
1417 if (ifibss->fixed_bssid)
1418 bssid = ifibss->bssid;
1419 if (ifibss->fixed_channel)
1420 chan = ifibss->chandef.chan;
1421 if (!is_zero_ether_addr(ifibss->bssid))
1422 bssid = ifibss->bssid;
1423 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1424 ifibss->ssid, ifibss->ssid_len,
1425 IEEE80211_BSS_TYPE_IBSS,
1426 IEEE80211_PRIVACY(ifibss->privacy));
1427
1428 if (cbss) {
1429 struct ieee80211_bss *bss;
1430
1431 bss = (void *)cbss->priv;
1432 ibss_dbg(sdata,
1433 "sta_find_ibss: selected %pM current %pM\n",
1434 cbss->bssid, ifibss->bssid);
1435 sdata_info(sdata,
1436 "Selected IBSS BSSID %pM based on configured SSID\n",
1437 cbss->bssid);
1438
1439 ieee80211_sta_join_ibss(sdata, bss);
1440 ieee80211_rx_bss_put(local, bss);
1441 return;
1442 }
1443
1444 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1445 * directly and do not waste time scanning
1446 */
1447 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1448 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1449 bssid);
1450 ieee80211_sta_create_ibss(sdata);
1451 return;
1452 }
1453
1454
1455 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1456
1457 /* Selected IBSS not found in current scan results - try to scan */
1458 if (time_after(jiffies, ifibss->last_scan_completed +
1459 IEEE80211_SCAN_INTERVAL)) {
1460 struct ieee80211_channel *channels[8];
1461 unsigned int num;
1462
1463 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1464
1465 if (ifibss->fixed_channel) {
1466 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1467 &ifibss->chandef,
1468 channels,
1469 ARRAY_SIZE(channels));
1470 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1471 ifibss->ssid_len, channels,
1472 num);
1473 } else {
1474 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1475 ifibss->ssid_len, NULL, 0);
1476 }
1477 } else {
1478 int interval = IEEE80211_SCAN_INTERVAL;
1479
1480 if (time_after(jiffies, ifibss->ibss_join_req +
1481 IEEE80211_IBSS_JOIN_TIMEOUT))
1482 ieee80211_sta_create_ibss(sdata);
1483
1484 mod_timer(&ifibss->timer,
1485 round_jiffies(jiffies + interval));
1486 }
1487 }
1488
ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data * sdata,struct sk_buff * req)1489 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1490 struct sk_buff *req)
1491 {
1492 struct ieee80211_mgmt *mgmt = (void *)req->data;
1493 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1494 struct ieee80211_local *local = sdata->local;
1495 int tx_last_beacon, len = req->len;
1496 struct sk_buff *skb;
1497 struct beacon_data *presp;
1498 u8 *pos, *end;
1499
1500 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1501
1502 presp = sdata_dereference(ifibss->presp, sdata);
1503
1504 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1505 len < 24 + 2 || !presp)
1506 return;
1507
1508 tx_last_beacon = drv_tx_last_beacon(local);
1509
1510 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1511 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1512 mgmt->bssid, tx_last_beacon);
1513
1514 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1515 return;
1516
1517 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1518 !is_broadcast_ether_addr(mgmt->bssid))
1519 return;
1520
1521 end = ((u8 *) mgmt) + len;
1522 pos = mgmt->u.probe_req.variable;
1523 if (pos[0] != WLAN_EID_SSID ||
1524 pos + 2 + pos[1] > end) {
1525 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1526 mgmt->sa);
1527 return;
1528 }
1529 if (pos[1] != 0 &&
1530 (pos[1] != ifibss->ssid_len ||
1531 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1532 /* Ignore ProbeReq for foreign SSID */
1533 return;
1534 }
1535
1536 /* Reply with ProbeResp */
1537 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1538 if (!skb)
1539 return;
1540
1541 skb_reserve(skb, local->tx_headroom);
1542 skb_put_data(skb, presp->head, presp->head_len);
1543
1544 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1545 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1546 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1547
1548 /* avoid excessive retries for probe request to wildcard SSIDs */
1549 if (pos[1] == 0)
1550 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1551
1552 ieee80211_tx_skb(sdata, skb);
1553 }
1554
1555 static
ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status)1556 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1557 struct ieee80211_mgmt *mgmt, size_t len,
1558 struct ieee80211_rx_status *rx_status)
1559 {
1560 size_t baselen;
1561 struct ieee802_11_elems *elems;
1562
1563 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1564 offsetof(typeof(mgmt->u.beacon), variable));
1565
1566 /*
1567 * either beacon or probe_resp but the variable field is at the
1568 * same offset
1569 */
1570 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1571 if (baselen > len)
1572 return;
1573
1574 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1575 len - baselen, false, NULL);
1576
1577 if (elems) {
1578 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems);
1579 kfree(elems);
1580 }
1581 }
1582
ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1583 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1584 struct sk_buff *skb)
1585 {
1586 struct ieee80211_rx_status *rx_status;
1587 struct ieee80211_mgmt *mgmt;
1588 u16 fc;
1589 struct ieee802_11_elems *elems;
1590 int ies_len;
1591
1592 rx_status = IEEE80211_SKB_RXCB(skb);
1593 mgmt = (struct ieee80211_mgmt *) skb->data;
1594 fc = le16_to_cpu(mgmt->frame_control);
1595
1596 if (!sdata->u.ibss.ssid_len)
1597 return; /* not ready to merge yet */
1598
1599 switch (fc & IEEE80211_FCTL_STYPE) {
1600 case IEEE80211_STYPE_PROBE_REQ:
1601 ieee80211_rx_mgmt_probe_req(sdata, skb);
1602 break;
1603 case IEEE80211_STYPE_PROBE_RESP:
1604 case IEEE80211_STYPE_BEACON:
1605 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1606 rx_status);
1607 break;
1608 case IEEE80211_STYPE_AUTH:
1609 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1610 break;
1611 case IEEE80211_STYPE_DEAUTH:
1612 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1613 break;
1614 case IEEE80211_STYPE_ACTION:
1615 switch (mgmt->u.action.category) {
1616 case WLAN_CATEGORY_SPECTRUM_MGMT:
1617 ies_len = skb->len -
1618 offsetof(struct ieee80211_mgmt,
1619 u.action.u.chan_switch.variable);
1620
1621 if (ies_len < 0)
1622 break;
1623
1624 elems = ieee802_11_parse_elems(
1625 mgmt->u.action.u.chan_switch.variable,
1626 ies_len, true, NULL);
1627
1628 if (elems && !elems->parse_error)
1629 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt,
1630 skb->len,
1631 rx_status,
1632 elems);
1633 kfree(elems);
1634 break;
1635 }
1636 }
1637 }
1638
ieee80211_ibss_work(struct ieee80211_sub_if_data * sdata)1639 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1640 {
1641 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1642 struct sta_info *sta;
1643
1644 /*
1645 * Work could be scheduled after scan or similar
1646 * when we aren't even joined (or trying) with a
1647 * network.
1648 */
1649 if (!ifibss->ssid_len)
1650 return;
1651
1652 spin_lock_bh(&ifibss->incomplete_lock);
1653 while (!list_empty(&ifibss->incomplete_stations)) {
1654 sta = list_first_entry(&ifibss->incomplete_stations,
1655 struct sta_info, list);
1656 list_del(&sta->list);
1657 spin_unlock_bh(&ifibss->incomplete_lock);
1658
1659 ieee80211_ibss_finish_sta(sta);
1660 rcu_read_unlock();
1661 spin_lock_bh(&ifibss->incomplete_lock);
1662 }
1663 spin_unlock_bh(&ifibss->incomplete_lock);
1664
1665 switch (ifibss->state) {
1666 case IEEE80211_IBSS_MLME_SEARCH:
1667 ieee80211_sta_find_ibss(sdata);
1668 break;
1669 case IEEE80211_IBSS_MLME_JOINED:
1670 ieee80211_sta_merge_ibss(sdata);
1671 break;
1672 default:
1673 WARN_ON(1);
1674 break;
1675 }
1676 }
1677
ieee80211_ibss_timer(struct timer_list * t)1678 static void ieee80211_ibss_timer(struct timer_list *t)
1679 {
1680 struct ieee80211_sub_if_data *sdata =
1681 from_timer(sdata, t, u.ibss.timer);
1682
1683 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
1684 }
1685
ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data * sdata)1686 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1687 {
1688 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1689
1690 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1691 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1692 spin_lock_init(&ifibss->incomplete_lock);
1693 wiphy_work_init(&ifibss->csa_connection_drop_work,
1694 ieee80211_csa_connection_drop_work);
1695 }
1696
1697 /* scan finished notification */
ieee80211_ibss_notify_scan_completed(struct ieee80211_local * local)1698 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1699 {
1700 struct ieee80211_sub_if_data *sdata;
1701
1702 lockdep_assert_wiphy(local->hw.wiphy);
1703
1704 list_for_each_entry(sdata, &local->interfaces, list) {
1705 if (!ieee80211_sdata_running(sdata))
1706 continue;
1707 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1708 continue;
1709 sdata->u.ibss.last_scan_completed = jiffies;
1710 }
1711 }
1712
ieee80211_ibss_join(struct ieee80211_sub_if_data * sdata,struct cfg80211_ibss_params * params)1713 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1714 struct cfg80211_ibss_params *params)
1715 {
1716 u64 changed = 0;
1717 u32 rate_flags;
1718 struct ieee80211_supported_band *sband;
1719 enum ieee80211_chanctx_mode chanmode;
1720 struct ieee80211_local *local = sdata->local;
1721 int radar_detect_width = 0;
1722 int i;
1723 int ret;
1724
1725 lockdep_assert_wiphy(local->hw.wiphy);
1726
1727 if (params->chandef.chan->freq_offset) {
1728 /* this may work, but is untested */
1729 return -EOPNOTSUPP;
1730 }
1731
1732 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1733 ¶ms->chandef,
1734 sdata->wdev.iftype);
1735 if (ret < 0)
1736 return ret;
1737
1738 if (ret > 0) {
1739 if (!params->userspace_handles_dfs)
1740 return -EINVAL;
1741 radar_detect_width = BIT(params->chandef.width);
1742 }
1743
1744 chanmode = (params->channel_fixed && !ret) ?
1745 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1746
1747 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode,
1748 radar_detect_width);
1749 if (ret < 0)
1750 return ret;
1751
1752 if (params->bssid) {
1753 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1754 sdata->u.ibss.fixed_bssid = true;
1755 } else
1756 sdata->u.ibss.fixed_bssid = false;
1757
1758 sdata->u.ibss.privacy = params->privacy;
1759 sdata->u.ibss.control_port = params->control_port;
1760 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1761 sdata->u.ibss.basic_rates = params->basic_rates;
1762 sdata->u.ibss.last_scan_completed = jiffies;
1763
1764 /* fix basic_rates if channel does not support these rates */
1765 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
1766 sband = local->hw.wiphy->bands[params->chandef.chan->band];
1767 for (i = 0; i < sband->n_bitrates; i++) {
1768 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1769 sdata->u.ibss.basic_rates &= ~BIT(i);
1770 }
1771 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1772 sizeof(params->mcast_rate));
1773
1774 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1775
1776 sdata->u.ibss.chandef = params->chandef;
1777 sdata->u.ibss.fixed_channel = params->channel_fixed;
1778
1779 if (params->ie) {
1780 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1781 GFP_KERNEL);
1782 if (sdata->u.ibss.ie)
1783 sdata->u.ibss.ie_len = params->ie_len;
1784 }
1785
1786 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1787 sdata->u.ibss.ibss_join_req = jiffies;
1788
1789 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1790 sdata->u.ibss.ssid_len = params->ssid_len;
1791
1792 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
1793 sizeof(sdata->u.ibss.ht_capa));
1794 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
1795 sizeof(sdata->u.ibss.ht_capa_mask));
1796
1797 /*
1798 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1799 * reserved, but an HT STA shall protect HT transmissions as though
1800 * the HT Protection field were set to non-HT mixed mode.
1801 *
1802 * In an IBSS, the RIFS Mode field of the HT Operation element is
1803 * also reserved, but an HT STA shall operate as though this field
1804 * were set to 1.
1805 */
1806
1807 sdata->vif.bss_conf.ht_operation_mode |=
1808 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1809 | IEEE80211_HT_PARAM_RIFS_MODE;
1810
1811 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1812 ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1813
1814 sdata->deflink.smps_mode = IEEE80211_SMPS_OFF;
1815 sdata->deflink.needed_rx_chains = local->rx_chains;
1816 sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1817
1818 wiphy_work_queue(local->hw.wiphy, &sdata->work);
1819
1820 return 0;
1821 }
1822
ieee80211_ibss_leave(struct ieee80211_sub_if_data * sdata)1823 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1824 {
1825 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1826
1827 ieee80211_ibss_disconnect(sdata);
1828 ifibss->ssid_len = 0;
1829 eth_zero_addr(ifibss->bssid);
1830
1831 /* remove beacon */
1832 kfree(sdata->u.ibss.ie);
1833 sdata->u.ibss.ie = NULL;
1834 sdata->u.ibss.ie_len = 0;
1835
1836 /* on the next join, re-program HT parameters */
1837 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1838 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1839
1840 synchronize_rcu();
1841
1842 skb_queue_purge(&sdata->skb_queue);
1843
1844 del_timer_sync(&sdata->u.ibss.timer);
1845
1846 return 0;
1847 }
1848