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Linux/net/mac80211/ibss.c

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  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 {
 44         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 45         struct ieee80211_local *local = sdata->local;
 46         int rates_n = 0, i, ri;
 47         struct ieee80211_mgmt *mgmt;
 48         u8 *pos;
 49         struct ieee80211_supported_band *sband;
 50         u32 rate_flags, rates = 0, rates_added = 0;
 51         struct beacon_data *presp;
 52         int frame_len;
 53         int shift;
 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                     2 + (IEEE80211_MAX_SUPP_RATES - 8) +
 63                     2 + sizeof(struct ieee80211_ht_cap) +
 64                     2 + sizeof(struct ieee80211_ht_operation) +
 65                     ifibss->ie_len;
 66         presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
 67         if (!presp)
 68                 return NULL;
 69 
 70         presp->head = (void *)(presp + 1);
 71 
 72         mgmt = (void *) presp->head;
 73         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 74                                           IEEE80211_STYPE_PROBE_RESP);
 75         eth_broadcast_addr(mgmt->da);
 76         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 77         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
 78         mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
 79         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
 80         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
 81 
 82         pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
 83 
 84         *pos++ = WLAN_EID_SSID;
 85         *pos++ = ifibss->ssid_len;
 86         memcpy(pos, ifibss->ssid, ifibss->ssid_len);
 87         pos += ifibss->ssid_len;
 88 
 89         sband = local->hw.wiphy->bands[chandef->chan->band];
 90         rate_flags = ieee80211_chandef_rate_flags(chandef);
 91         shift = ieee80211_chandef_get_shift(chandef);
 92         rates_n = 0;
 93         if (have_higher_than_11mbit)
 94                 *have_higher_than_11mbit = false;
 95 
 96         for (i = 0; i < sband->n_bitrates; i++) {
 97                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
 98                         continue;
 99                 if (sband->bitrates[i].bitrate > 110 &&
100                     have_higher_than_11mbit)
101                         *have_higher_than_11mbit = true;
102 
103                 rates |= BIT(i);
104                 rates_n++;
105         }
106 
107         *pos++ = WLAN_EID_SUPP_RATES;
108         *pos++ = min_t(int, 8, rates_n);
109         for (ri = 0; ri < sband->n_bitrates; ri++) {
110                 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
111                                         5 * (1 << shift));
112                 u8 basic = 0;
113                 if (!(rates & BIT(ri)))
114                         continue;
115 
116                 if (basic_rates & BIT(ri))
117                         basic = 0x80;
118                 *pos++ = basic | (u8) rate;
119                 if (++rates_added == 8) {
120                         ri++; /* continue at next rate for EXT_SUPP_RATES */
121                         break;
122                 }
123         }
124 
125         if (sband->band == IEEE80211_BAND_2GHZ) {
126                 *pos++ = WLAN_EID_DS_PARAMS;
127                 *pos++ = 1;
128                 *pos++ = ieee80211_frequency_to_channel(
129                                 chandef->chan->center_freq);
130         }
131 
132         *pos++ = WLAN_EID_IBSS_PARAMS;
133         *pos++ = 2;
134         /* FIX: set ATIM window based on scan results */
135         *pos++ = 0;
136         *pos++ = 0;
137 
138         /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
139         if (rates_n > 8) {
140                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
141                 *pos++ = rates_n - 8;
142                 for (; ri < sband->n_bitrates; ri++) {
143                         int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
144                                                 5 * (1 << shift));
145                         u8 basic = 0;
146                         if (!(rates & BIT(ri)))
147                                 continue;
148 
149                         if (basic_rates & BIT(ri))
150                                 basic = 0x80;
151                         *pos++ = basic | (u8) rate;
152                 }
153         }
154 
155         if (ifibss->ie_len) {
156                 memcpy(pos, ifibss->ie, ifibss->ie_len);
157                 pos += ifibss->ie_len;
158         }
159 
160         /* add HT capability and information IEs */
161         if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
162             chandef->width != NL80211_CHAN_WIDTH_5 &&
163             chandef->width != NL80211_CHAN_WIDTH_10 &&
164             sband->ht_cap.ht_supported) {
165                 struct ieee80211_sta_ht_cap ht_cap;
166 
167                 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
168                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
169 
170                 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
171                 /*
172                  * Note: According to 802.11n-2009 9.13.3.1, HT Protection
173                  * field and RIFS Mode are reserved in IBSS mode, therefore
174                  * keep them at 0
175                  */
176                 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
177                                                  chandef, 0);
178         }
179 
180         if (local->hw.queues >= IEEE80211_NUM_ACS) {
181                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
182                 *pos++ = 7; /* len */
183                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
184                 *pos++ = 0x50;
185                 *pos++ = 0xf2;
186                 *pos++ = 2; /* WME */
187                 *pos++ = 0; /* WME info */
188                 *pos++ = 1; /* WME ver */
189                 *pos++ = 0; /* U-APSD no in use */
190         }
191 
192         presp->head_len = pos - presp->head;
193         if (WARN_ON(presp->head_len > frame_len))
194                 goto error;
195 
196         return presp;
197 error:
198         kfree(presp);
199         return NULL;
200 }
201 
202 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
203                                       const u8 *bssid, const int beacon_int,
204                                       struct cfg80211_chan_def *req_chandef,
205                                       const u32 basic_rates,
206                                       const u16 capability, u64 tsf,
207                                       bool creator)
208 {
209         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
210         struct ieee80211_local *local = sdata->local;
211         struct ieee80211_supported_band *sband;
212         struct ieee80211_mgmt *mgmt;
213         struct cfg80211_bss *bss;
214         u32 bss_change;
215         struct cfg80211_chan_def chandef;
216         struct ieee80211_channel *chan;
217         struct beacon_data *presp;
218         enum nl80211_bss_scan_width scan_width;
219         bool have_higher_than_11mbit;
220 
221         sdata_assert_lock(sdata);
222 
223         /* Reset own TSF to allow time synchronization work. */
224         drv_reset_tsf(local, sdata);
225 
226         if (!ether_addr_equal(ifibss->bssid, bssid))
227                 sta_info_flush(sdata);
228 
229         /* if merging, indicate to driver that we leave the old IBSS */
230         if (sdata->vif.bss_conf.ibss_joined) {
231                 sdata->vif.bss_conf.ibss_joined = false;
232                 sdata->vif.bss_conf.ibss_creator = false;
233                 sdata->vif.bss_conf.enable_beacon = false;
234                 netif_carrier_off(sdata->dev);
235                 ieee80211_bss_info_change_notify(sdata,
236                                                  BSS_CHANGED_IBSS |
237                                                  BSS_CHANGED_BEACON_ENABLED);
238         }
239 
240         presp = rcu_dereference_protected(ifibss->presp,
241                                           lockdep_is_held(&sdata->wdev.mtx));
242         rcu_assign_pointer(ifibss->presp, NULL);
243         if (presp)
244                 kfree_rcu(presp, rcu_head);
245 
246         sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
247 
248         /* make a copy of the chandef, it could be modified below. */
249         chandef = *req_chandef;
250         chan = chandef.chan;
251         if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
252                 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
253                     chandef.width == NL80211_CHAN_WIDTH_10 ||
254                     chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
255                     chandef.width == NL80211_CHAN_WIDTH_20) {
256                         sdata_info(sdata,
257                                    "Failed to join IBSS, beacons forbidden\n");
258                         return;
259                 }
260                 chandef.width = NL80211_CHAN_WIDTH_20;
261                 chandef.center_freq1 = chan->center_freq;
262         }
263 
264         ieee80211_vif_release_channel(sdata);
265         if (ieee80211_vif_use_channel(sdata, &chandef,
266                                       ifibss->fixed_channel ?
267                                         IEEE80211_CHANCTX_SHARED :
268                                         IEEE80211_CHANCTX_EXCLUSIVE)) {
269                 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
270                 return;
271         }
272 
273         memcpy(ifibss->bssid, bssid, ETH_ALEN);
274 
275         sband = local->hw.wiphy->bands[chan->band];
276 
277         presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
278                                            capability, tsf, &chandef,
279                                            &have_higher_than_11mbit);
280         if (!presp)
281                 return;
282 
283         rcu_assign_pointer(ifibss->presp, presp);
284         mgmt = (void *)presp->head;
285 
286         sdata->vif.bss_conf.enable_beacon = true;
287         sdata->vif.bss_conf.beacon_int = beacon_int;
288         sdata->vif.bss_conf.basic_rates = basic_rates;
289         sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
290         memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
291         bss_change = BSS_CHANGED_BEACON_INT;
292         bss_change |= ieee80211_reset_erp_info(sdata);
293         bss_change |= BSS_CHANGED_BSSID;
294         bss_change |= BSS_CHANGED_BEACON;
295         bss_change |= BSS_CHANGED_BEACON_ENABLED;
296         bss_change |= BSS_CHANGED_BASIC_RATES;
297         bss_change |= BSS_CHANGED_HT;
298         bss_change |= BSS_CHANGED_IBSS;
299         bss_change |= BSS_CHANGED_SSID;
300 
301         /*
302          * In 5 GHz/802.11a, we can always use short slot time.
303          * (IEEE 802.11-2012 18.3.8.7)
304          *
305          * In 2.4GHz, we must always use long slots in IBSS for compatibility
306          * reasons.
307          * (IEEE 802.11-2012 19.4.5)
308          *
309          * HT follows these specifications (IEEE 802.11-2012 20.3.18)
310          */
311         sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
312         bss_change |= BSS_CHANGED_ERP_SLOT;
313 
314         /* cf. IEEE 802.11 9.2.12 */
315         if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
316                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
317         else
318                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
319 
320         sdata->vif.bss_conf.ibss_joined = true;
321         sdata->vif.bss_conf.ibss_creator = creator;
322         ieee80211_bss_info_change_notify(sdata, bss_change);
323 
324         ieee80211_set_wmm_default(sdata, true);
325 
326         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
327         mod_timer(&ifibss->timer,
328                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
329 
330         scan_width = cfg80211_chandef_to_scan_width(&chandef);
331         bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan,
332                                               scan_width, mgmt,
333                                               presp->head_len, 0, GFP_KERNEL);
334         cfg80211_put_bss(local->hw.wiphy, bss);
335         netif_carrier_on(sdata->dev);
336         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
337 }
338 
339 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
340                                     struct ieee80211_bss *bss)
341 {
342         struct cfg80211_bss *cbss =
343                 container_of((void *)bss, struct cfg80211_bss, priv);
344         struct ieee80211_supported_band *sband;
345         struct cfg80211_chan_def chandef;
346         u32 basic_rates;
347         int i, j;
348         u16 beacon_int = cbss->beacon_interval;
349         const struct cfg80211_bss_ies *ies;
350         enum nl80211_channel_type chan_type;
351         u64 tsf;
352         u32 rate_flags;
353         int shift;
354 
355         sdata_assert_lock(sdata);
356 
357         if (beacon_int < 10)
358                 beacon_int = 10;
359 
360         switch (sdata->u.ibss.chandef.width) {
361         case NL80211_CHAN_WIDTH_20_NOHT:
362         case NL80211_CHAN_WIDTH_20:
363         case NL80211_CHAN_WIDTH_40:
364                 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
365                 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
366                 break;
367         case NL80211_CHAN_WIDTH_5:
368         case NL80211_CHAN_WIDTH_10:
369                 cfg80211_chandef_create(&chandef, cbss->channel,
370                                         NL80211_CHAN_WIDTH_20_NOHT);
371                 chandef.width = sdata->u.ibss.chandef.width;
372                 break;
373         default:
374                 /* fall back to 20 MHz for unsupported modes */
375                 cfg80211_chandef_create(&chandef, cbss->channel,
376                                         NL80211_CHAN_WIDTH_20_NOHT);
377                 break;
378         }
379 
380         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
381         rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
382         shift = ieee80211_vif_get_shift(&sdata->vif);
383 
384         basic_rates = 0;
385 
386         for (i = 0; i < bss->supp_rates_len; i++) {
387                 int rate = bss->supp_rates[i] & 0x7f;
388                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
389 
390                 for (j = 0; j < sband->n_bitrates; j++) {
391                         int brate;
392                         if ((rate_flags & sband->bitrates[j].flags)
393                             != rate_flags)
394                                 continue;
395 
396                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
397                                              5 * (1 << shift));
398                         if (brate == rate) {
399                                 if (is_basic)
400                                         basic_rates |= BIT(j);
401                                 break;
402                         }
403                 }
404         }
405 
406         rcu_read_lock();
407         ies = rcu_dereference(cbss->ies);
408         tsf = ies->tsf;
409         rcu_read_unlock();
410 
411         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
412                                   beacon_int,
413                                   &chandef,
414                                   basic_rates,
415                                   cbss->capability,
416                                   tsf, false);
417 }
418 
419 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
420         __acquires(RCU)
421 {
422         struct ieee80211_sub_if_data *sdata = sta->sdata;
423         u8 addr[ETH_ALEN];
424 
425         memcpy(addr, sta->sta.addr, ETH_ALEN);
426 
427         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
428 
429         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
430         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
431         /* authorize the station only if the network is not RSN protected. If
432          * not wait for the userspace to authorize it */
433         if (!sta->sdata->u.ibss.control_port)
434                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
435 
436         rate_control_rate_init(sta);
437 
438         /* If it fails, maybe we raced another insertion? */
439         if (sta_info_insert_rcu(sta))
440                 return sta_info_get(sdata, addr);
441         return sta;
442 }
443 
444 static struct sta_info *
445 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
446                        const u8 *addr, u32 supp_rates)
447         __acquires(RCU)
448 {
449         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
450         struct ieee80211_local *local = sdata->local;
451         struct sta_info *sta;
452         struct ieee80211_chanctx_conf *chanctx_conf;
453         struct ieee80211_supported_band *sband;
454         enum nl80211_bss_scan_width scan_width;
455         int band;
456 
457         /*
458          * XXX: Consider removing the least recently used entry and
459          *      allow new one to be added.
460          */
461         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
462                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
463                                     sdata->name, addr);
464                 rcu_read_lock();
465                 return NULL;
466         }
467 
468         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
469                 rcu_read_lock();
470                 return NULL;
471         }
472 
473         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
474                 rcu_read_lock();
475                 return NULL;
476         }
477 
478         rcu_read_lock();
479         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
480         if (WARN_ON_ONCE(!chanctx_conf))
481                 return NULL;
482         band = chanctx_conf->def.chan->band;
483         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
484         rcu_read_unlock();
485 
486         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
487         if (!sta) {
488                 rcu_read_lock();
489                 return NULL;
490         }
491 
492         sta->last_rx = jiffies;
493 
494         /* make sure mandatory rates are always added */
495         sband = local->hw.wiphy->bands[band];
496         sta->sta.supp_rates[band] = supp_rates |
497                         ieee80211_mandatory_rates(sband, scan_width);
498 
499         return ieee80211_ibss_finish_sta(sta);
500 }
501 
502 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
503                                           struct ieee80211_mgmt *mgmt,
504                                           size_t len)
505 {
506         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
507 
508         if (len < IEEE80211_DEAUTH_FRAME_LEN)
509                 return;
510 
511         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
512                  mgmt->sa, mgmt->da, mgmt->bssid, reason);
513         sta_info_destroy_addr(sdata, mgmt->sa);
514 }
515 
516 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
517                                         struct ieee80211_mgmt *mgmt,
518                                         size_t len)
519 {
520         u16 auth_alg, auth_transaction;
521 
522         sdata_assert_lock(sdata);
523 
524         if (len < 24 + 6)
525                 return;
526 
527         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
528         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
529 
530         ibss_dbg(sdata,
531                  "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
532                  mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
533 
534         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
535                 return;
536 
537         /*
538          * IEEE 802.11 standard does not require authentication in IBSS
539          * networks and most implementations do not seem to use it.
540          * However, try to reply to authentication attempts if someone
541          * has actually implemented this.
542          */
543         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
544                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
545 }
546 
547 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
548                                   struct ieee80211_mgmt *mgmt, size_t len,
549                                   struct ieee80211_rx_status *rx_status,
550                                   struct ieee802_11_elems *elems)
551 {
552         struct ieee80211_local *local = sdata->local;
553         int freq;
554         struct cfg80211_bss *cbss;
555         struct ieee80211_bss *bss;
556         struct sta_info *sta;
557         struct ieee80211_channel *channel;
558         u64 beacon_timestamp, rx_timestamp;
559         u32 supp_rates = 0;
560         enum ieee80211_band band = rx_status->band;
561         enum nl80211_bss_scan_width scan_width;
562         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
563         bool rates_updated = false;
564 
565         if (elems->ds_params)
566                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
567                                                       band);
568         else
569                 freq = rx_status->freq;
570 
571         channel = ieee80211_get_channel(local->hw.wiphy, freq);
572 
573         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
574                 return;
575 
576         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
577             ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
578 
579                 rcu_read_lock();
580                 sta = sta_info_get(sdata, mgmt->sa);
581 
582                 if (elems->supp_rates) {
583                         supp_rates = ieee80211_sta_get_rates(sdata, elems,
584                                                              band, NULL);
585                         if (sta) {
586                                 u32 prev_rates;
587 
588                                 prev_rates = sta->sta.supp_rates[band];
589                                 /* make sure mandatory rates are always added */
590                                 scan_width = NL80211_BSS_CHAN_WIDTH_20;
591                                 if (rx_status->flag & RX_FLAG_5MHZ)
592                                         scan_width = NL80211_BSS_CHAN_WIDTH_5;
593                                 if (rx_status->flag & RX_FLAG_10MHZ)
594                                         scan_width = NL80211_BSS_CHAN_WIDTH_10;
595 
596                                 sta->sta.supp_rates[band] = supp_rates |
597                                         ieee80211_mandatory_rates(sband,
598                                                                   scan_width);
599                                 if (sta->sta.supp_rates[band] != prev_rates) {
600                                         ibss_dbg(sdata,
601                                                  "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
602                                                  sta->sta.addr, prev_rates,
603                                                  sta->sta.supp_rates[band]);
604                                         rates_updated = true;
605                                 }
606                         } else {
607                                 rcu_read_unlock();
608                                 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
609                                                 mgmt->sa, supp_rates);
610                         }
611                 }
612 
613                 if (sta && elems->wmm_info)
614                         set_sta_flag(sta, WLAN_STA_WME);
615 
616                 if (sta && elems->ht_operation && elems->ht_cap_elem &&
617                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
618                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
619                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
620                         /* we both use HT */
621                         struct ieee80211_ht_cap htcap_ie;
622                         struct cfg80211_chan_def chandef;
623 
624                         ieee80211_ht_oper_to_chandef(channel,
625                                                      elems->ht_operation,
626                                                      &chandef);
627 
628                         memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
629 
630                         /*
631                          * fall back to HT20 if we don't use or use
632                          * the other extension channel
633                          */
634                         if (chandef.center_freq1 !=
635                             sdata->u.ibss.chandef.center_freq1)
636                                 htcap_ie.cap_info &=
637                                         cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
638 
639                         rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
640                                                 sdata, sband, &htcap_ie, sta);
641                 }
642 
643                 if (sta && rates_updated) {
644                         drv_sta_rc_update(local, sdata, &sta->sta,
645                                           IEEE80211_RC_SUPP_RATES_CHANGED);
646                         rate_control_rate_init(sta);
647                 }
648 
649                 rcu_read_unlock();
650         }
651 
652         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
653                                         channel);
654         if (!bss)
655                 return;
656 
657         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
658 
659         /* same for beacon and probe response */
660         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
661 
662         /* check if we need to merge IBSS */
663 
664         /* we use a fixed BSSID */
665         if (sdata->u.ibss.fixed_bssid)
666                 goto put_bss;
667 
668         /* not an IBSS */
669         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
670                 goto put_bss;
671 
672         /* different channel */
673         if (sdata->u.ibss.fixed_channel &&
674             sdata->u.ibss.chandef.chan != cbss->channel)
675                 goto put_bss;
676 
677         /* different SSID */
678         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
679             memcmp(elems->ssid, sdata->u.ibss.ssid,
680                                 sdata->u.ibss.ssid_len))
681                 goto put_bss;
682 
683         /* same BSSID */
684         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
685                 goto put_bss;
686 
687         if (ieee80211_have_rx_timestamp(rx_status)) {
688                 /* time when timestamp field was received */
689                 rx_timestamp =
690                         ieee80211_calculate_rx_timestamp(local, rx_status,
691                                                          len + FCS_LEN, 24);
692         } else {
693                 /*
694                  * second best option: get current TSF
695                  * (will return -1 if not supported)
696                  */
697                 rx_timestamp = drv_get_tsf(local, sdata);
698         }
699 
700         ibss_dbg(sdata,
701                  "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
702                  mgmt->sa, mgmt->bssid,
703                  (unsigned long long)rx_timestamp,
704                  (unsigned long long)beacon_timestamp,
705                  (unsigned long long)(rx_timestamp - beacon_timestamp),
706                  jiffies);
707 
708         if (beacon_timestamp > rx_timestamp) {
709                 ibss_dbg(sdata,
710                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
711                          mgmt->bssid);
712                 ieee80211_sta_join_ibss(sdata, bss);
713                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
714                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
715                                        supp_rates);
716                 rcu_read_unlock();
717         }
718 
719  put_bss:
720         ieee80211_rx_bss_put(local, bss);
721 }
722 
723 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
724                               const u8 *bssid, const u8 *addr,
725                               u32 supp_rates)
726 {
727         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
728         struct ieee80211_local *local = sdata->local;
729         struct sta_info *sta;
730         struct ieee80211_chanctx_conf *chanctx_conf;
731         struct ieee80211_supported_band *sband;
732         enum nl80211_bss_scan_width scan_width;
733         int band;
734 
735         /*
736          * XXX: Consider removing the least recently used entry and
737          *      allow new one to be added.
738          */
739         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
740                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
741                                     sdata->name, addr);
742                 return;
743         }
744 
745         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
746                 return;
747 
748         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
749                 return;
750 
751         rcu_read_lock();
752         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
753         if (WARN_ON_ONCE(!chanctx_conf)) {
754                 rcu_read_unlock();
755                 return;
756         }
757         band = chanctx_conf->def.chan->band;
758         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
759         rcu_read_unlock();
760 
761         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
762         if (!sta)
763                 return;
764 
765         sta->last_rx = jiffies;
766 
767         /* make sure mandatory rates are always added */
768         sband = local->hw.wiphy->bands[band];
769         sta->sta.supp_rates[band] = supp_rates |
770                         ieee80211_mandatory_rates(sband, scan_width);
771 
772         spin_lock(&ifibss->incomplete_lock);
773         list_add(&sta->list, &ifibss->incomplete_stations);
774         spin_unlock(&ifibss->incomplete_lock);
775         ieee80211_queue_work(&local->hw, &sdata->work);
776 }
777 
778 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
779 {
780         struct ieee80211_local *local = sdata->local;
781         int active = 0;
782         struct sta_info *sta;
783 
784         sdata_assert_lock(sdata);
785 
786         rcu_read_lock();
787 
788         list_for_each_entry_rcu(sta, &local->sta_list, list) {
789                 if (sta->sdata == sdata &&
790                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
791                                jiffies)) {
792                         active++;
793                         break;
794                 }
795         }
796 
797         rcu_read_unlock();
798 
799         return active;
800 }
801 
802 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
803 {
804         struct ieee80211_local *local = sdata->local;
805         struct sta_info *sta, *tmp;
806         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
807         unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
808 
809         mutex_lock(&local->sta_mtx);
810 
811         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
812                 if (sdata != sta->sdata)
813                         continue;
814 
815                 if (time_after(jiffies, sta->last_rx + exp_time) ||
816                     (time_after(jiffies, sta->last_rx + exp_rsn_time) &&
817                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
818                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
819                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
820                                 "not authorized " : "", sta->sta.addr);
821 
822                         WARN_ON(__sta_info_destroy(sta));
823                 }
824         }
825 
826         mutex_unlock(&local->sta_mtx);
827 }
828 
829 /*
830  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
831  */
832 
833 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
834 {
835         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
836         enum nl80211_bss_scan_width scan_width;
837 
838         sdata_assert_lock(sdata);
839 
840         mod_timer(&ifibss->timer,
841                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
842 
843         ieee80211_ibss_sta_expire(sdata);
844 
845         if (time_before(jiffies, ifibss->last_scan_completed +
846                        IEEE80211_IBSS_MERGE_INTERVAL))
847                 return;
848 
849         if (ieee80211_sta_active_ibss(sdata))
850                 return;
851 
852         if (ifibss->fixed_channel)
853                 return;
854 
855         sdata_info(sdata,
856                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
857 
858         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
859         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
860                                     NULL, scan_width);
861 }
862 
863 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
864 {
865         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
866         u8 bssid[ETH_ALEN];
867         u16 capability;
868         int i;
869 
870         sdata_assert_lock(sdata);
871 
872         if (ifibss->fixed_bssid) {
873                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
874         } else {
875                 /* Generate random, not broadcast, locally administered BSSID. Mix in
876                  * own MAC address to make sure that devices that do not have proper
877                  * random number generator get different BSSID. */
878                 get_random_bytes(bssid, ETH_ALEN);
879                 for (i = 0; i < ETH_ALEN; i++)
880                         bssid[i] ^= sdata->vif.addr[i];
881                 bssid[0] &= ~0x01;
882                 bssid[0] |= 0x02;
883         }
884 
885         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
886 
887         capability = WLAN_CAPABILITY_IBSS;
888 
889         if (ifibss->privacy)
890                 capability |= WLAN_CAPABILITY_PRIVACY;
891         else
892                 sdata->drop_unencrypted = 0;
893 
894         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
895                                   &ifibss->chandef, ifibss->basic_rates,
896                                   capability, 0, true);
897 }
898 
899 /*
900  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
901  */
902 
903 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
904 {
905         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
906         struct ieee80211_local *local = sdata->local;
907         struct cfg80211_bss *cbss;
908         struct ieee80211_channel *chan = NULL;
909         const u8 *bssid = NULL;
910         enum nl80211_bss_scan_width scan_width;
911         int active_ibss;
912         u16 capability;
913 
914         sdata_assert_lock(sdata);
915 
916         active_ibss = ieee80211_sta_active_ibss(sdata);
917         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
918 
919         if (active_ibss)
920                 return;
921 
922         capability = WLAN_CAPABILITY_IBSS;
923         if (ifibss->privacy)
924                 capability |= WLAN_CAPABILITY_PRIVACY;
925         if (ifibss->fixed_bssid)
926                 bssid = ifibss->bssid;
927         if (ifibss->fixed_channel)
928                 chan = ifibss->chandef.chan;
929         if (!is_zero_ether_addr(ifibss->bssid))
930                 bssid = ifibss->bssid;
931         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
932                                 ifibss->ssid, ifibss->ssid_len,
933                                 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
934                                 capability);
935 
936         if (cbss) {
937                 struct ieee80211_bss *bss;
938 
939                 bss = (void *)cbss->priv;
940                 ibss_dbg(sdata,
941                          "sta_find_ibss: selected %pM current %pM\n",
942                          cbss->bssid, ifibss->bssid);
943                 sdata_info(sdata,
944                            "Selected IBSS BSSID %pM based on configured SSID\n",
945                            cbss->bssid);
946 
947                 ieee80211_sta_join_ibss(sdata, bss);
948                 ieee80211_rx_bss_put(local, bss);
949                 return;
950         }
951 
952         /* if a fixed bssid and a fixed freq have been provided create the IBSS
953          * directly and do not waste time scanning
954          */
955         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
956                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
957                            bssid);
958                 ieee80211_sta_create_ibss(sdata);
959                 return;
960         }
961 
962 
963         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
964 
965         /* Selected IBSS not found in current scan results - try to scan */
966         if (time_after(jiffies, ifibss->last_scan_completed +
967                                         IEEE80211_SCAN_INTERVAL)) {
968                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
969 
970                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
971                 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
972                                             ifibss->ssid_len, chan,
973                                             scan_width);
974         } else {
975                 int interval = IEEE80211_SCAN_INTERVAL;
976 
977                 if (time_after(jiffies, ifibss->ibss_join_req +
978                                IEEE80211_IBSS_JOIN_TIMEOUT))
979                         ieee80211_sta_create_ibss(sdata);
980 
981                 mod_timer(&ifibss->timer,
982                           round_jiffies(jiffies + interval));
983         }
984 }
985 
986 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
987                                         struct sk_buff *req)
988 {
989         struct ieee80211_mgmt *mgmt = (void *)req->data;
990         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
991         struct ieee80211_local *local = sdata->local;
992         int tx_last_beacon, len = req->len;
993         struct sk_buff *skb;
994         struct beacon_data *presp;
995         u8 *pos, *end;
996 
997         sdata_assert_lock(sdata);
998 
999         presp = rcu_dereference_protected(ifibss->presp,
1000                                           lockdep_is_held(&sdata->wdev.mtx));
1001 
1002         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1003             len < 24 + 2 || !presp)
1004                 return;
1005 
1006         tx_last_beacon = drv_tx_last_beacon(local);
1007 
1008         ibss_dbg(sdata,
1009                  "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1010                  mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1011 
1012         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1013                 return;
1014 
1015         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1016             !is_broadcast_ether_addr(mgmt->bssid))
1017                 return;
1018 
1019         end = ((u8 *) mgmt) + len;
1020         pos = mgmt->u.probe_req.variable;
1021         if (pos[0] != WLAN_EID_SSID ||
1022             pos + 2 + pos[1] > end) {
1023                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1024                          mgmt->sa);
1025                 return;
1026         }
1027         if (pos[1] != 0 &&
1028             (pos[1] != ifibss->ssid_len ||
1029              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1030                 /* Ignore ProbeReq for foreign SSID */
1031                 return;
1032         }
1033 
1034         /* Reply with ProbeResp */
1035         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1036         if (!skb)
1037                 return;
1038 
1039         skb_reserve(skb, local->tx_headroom);
1040         memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1041 
1042         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1043         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1044         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1045         ieee80211_tx_skb(sdata, skb);
1046 }
1047 
1048 static
1049 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1050                                     struct ieee80211_mgmt *mgmt, size_t len,
1051                                     struct ieee80211_rx_status *rx_status)
1052 {
1053         size_t baselen;
1054         struct ieee802_11_elems elems;
1055 
1056         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1057                      offsetof(typeof(mgmt->u.beacon), variable));
1058 
1059         /*
1060          * either beacon or probe_resp but the variable field is at the
1061          * same offset
1062          */
1063         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1064         if (baselen > len)
1065                 return;
1066 
1067         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1068                                false, &elems);
1069 
1070         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1071 }
1072 
1073 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1074                                    struct sk_buff *skb)
1075 {
1076         struct ieee80211_rx_status *rx_status;
1077         struct ieee80211_mgmt *mgmt;
1078         u16 fc;
1079 
1080         rx_status = IEEE80211_SKB_RXCB(skb);
1081         mgmt = (struct ieee80211_mgmt *) skb->data;
1082         fc = le16_to_cpu(mgmt->frame_control);
1083 
1084         sdata_lock(sdata);
1085 
1086         if (!sdata->u.ibss.ssid_len)
1087                 goto mgmt_out; /* not ready to merge yet */
1088 
1089         switch (fc & IEEE80211_FCTL_STYPE) {
1090         case IEEE80211_STYPE_PROBE_REQ:
1091                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1092                 break;
1093         case IEEE80211_STYPE_PROBE_RESP:
1094         case IEEE80211_STYPE_BEACON:
1095                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1096                                                rx_status);
1097                 break;
1098         case IEEE80211_STYPE_AUTH:
1099                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1100                 break;
1101         case IEEE80211_STYPE_DEAUTH:
1102                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1103                 break;
1104         }
1105 
1106  mgmt_out:
1107         sdata_unlock(sdata);
1108 }
1109 
1110 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1111 {
1112         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1113         struct sta_info *sta;
1114 
1115         sdata_lock(sdata);
1116 
1117         /*
1118          * Work could be scheduled after scan or similar
1119          * when we aren't even joined (or trying) with a
1120          * network.
1121          */
1122         if (!ifibss->ssid_len)
1123                 goto out;
1124 
1125         spin_lock_bh(&ifibss->incomplete_lock);
1126         while (!list_empty(&ifibss->incomplete_stations)) {
1127                 sta = list_first_entry(&ifibss->incomplete_stations,
1128                                        struct sta_info, list);
1129                 list_del(&sta->list);
1130                 spin_unlock_bh(&ifibss->incomplete_lock);
1131 
1132                 ieee80211_ibss_finish_sta(sta);
1133                 rcu_read_unlock();
1134                 spin_lock_bh(&ifibss->incomplete_lock);
1135         }
1136         spin_unlock_bh(&ifibss->incomplete_lock);
1137 
1138         switch (ifibss->state) {
1139         case IEEE80211_IBSS_MLME_SEARCH:
1140                 ieee80211_sta_find_ibss(sdata);
1141                 break;
1142         case IEEE80211_IBSS_MLME_JOINED:
1143                 ieee80211_sta_merge_ibss(sdata);
1144                 break;
1145         default:
1146                 WARN_ON(1);
1147                 break;
1148         }
1149 
1150  out:
1151         sdata_unlock(sdata);
1152 }
1153 
1154 static void ieee80211_ibss_timer(unsigned long data)
1155 {
1156         struct ieee80211_sub_if_data *sdata =
1157                 (struct ieee80211_sub_if_data *) data;
1158 
1159         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1160 }
1161 
1162 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1163 {
1164         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1165 
1166         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1167                     (unsigned long) sdata);
1168         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1169         spin_lock_init(&ifibss->incomplete_lock);
1170 }
1171 
1172 /* scan finished notification */
1173 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1174 {
1175         struct ieee80211_sub_if_data *sdata;
1176 
1177         mutex_lock(&local->iflist_mtx);
1178         list_for_each_entry(sdata, &local->interfaces, list) {
1179                 if (!ieee80211_sdata_running(sdata))
1180                         continue;
1181                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1182                         continue;
1183                 sdata->u.ibss.last_scan_completed = jiffies;
1184                 ieee80211_queue_work(&local->hw, &sdata->work);
1185         }
1186         mutex_unlock(&local->iflist_mtx);
1187 }
1188 
1189 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1190                         struct cfg80211_ibss_params *params)
1191 {
1192         u32 changed = 0;
1193         u32 rate_flags;
1194         struct ieee80211_supported_band *sband;
1195         int i;
1196 
1197         if (params->bssid) {
1198                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1199                 sdata->u.ibss.fixed_bssid = true;
1200         } else
1201                 sdata->u.ibss.fixed_bssid = false;
1202 
1203         sdata->u.ibss.privacy = params->privacy;
1204         sdata->u.ibss.control_port = params->control_port;
1205         sdata->u.ibss.basic_rates = params->basic_rates;
1206         sdata->u.ibss.last_scan_completed = jiffies;
1207 
1208         /* fix basic_rates if channel does not support these rates */
1209         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1210         sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band];
1211         for (i = 0; i < sband->n_bitrates; i++) {
1212                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1213                         sdata->u.ibss.basic_rates &= ~BIT(i);
1214         }
1215         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1216                sizeof(params->mcast_rate));
1217 
1218         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1219 
1220         sdata->u.ibss.chandef = params->chandef;
1221         sdata->u.ibss.fixed_channel = params->channel_fixed;
1222 
1223         if (params->ie) {
1224                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1225                                            GFP_KERNEL);
1226                 if (sdata->u.ibss.ie)
1227                         sdata->u.ibss.ie_len = params->ie_len;
1228         }
1229 
1230         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1231         sdata->u.ibss.ibss_join_req = jiffies;
1232 
1233         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1234         sdata->u.ibss.ssid_len = params->ssid_len;
1235 
1236         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1237                sizeof(sdata->u.ibss.ht_capa));
1238         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1239                sizeof(sdata->u.ibss.ht_capa_mask));
1240 
1241         /*
1242          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1243          * reserved, but an HT STA shall protect HT transmissions as though
1244          * the HT Protection field were set to non-HT mixed mode.
1245          *
1246          * In an IBSS, the RIFS Mode field of the HT Operation element is
1247          * also reserved, but an HT STA shall operate as though this field
1248          * were set to 1.
1249          */
1250 
1251         sdata->vif.bss_conf.ht_operation_mode |=
1252                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1253                 | IEEE80211_HT_PARAM_RIFS_MODE;
1254 
1255         changed |= BSS_CHANGED_HT;
1256         ieee80211_bss_info_change_notify(sdata, changed);
1257 
1258         sdata->smps_mode = IEEE80211_SMPS_OFF;
1259         sdata->needed_rx_chains = sdata->local->rx_chains;
1260 
1261         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1262 
1263         return 0;
1264 }
1265 
1266 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1267 {
1268         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1269         struct ieee80211_local *local = sdata->local;
1270         struct cfg80211_bss *cbss;
1271         u16 capability;
1272         int active_ibss;
1273         struct sta_info *sta;
1274         struct beacon_data *presp;
1275 
1276         active_ibss = ieee80211_sta_active_ibss(sdata);
1277 
1278         if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
1279                 capability = WLAN_CAPABILITY_IBSS;
1280 
1281                 if (ifibss->privacy)
1282                         capability |= WLAN_CAPABILITY_PRIVACY;
1283 
1284                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
1285                                         ifibss->bssid, ifibss->ssid,
1286                                         ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
1287                                         WLAN_CAPABILITY_PRIVACY,
1288                                         capability);
1289 
1290                 if (cbss) {
1291                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
1292                         cfg80211_put_bss(local->hw.wiphy, cbss);
1293                 }
1294         }
1295 
1296         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
1297         memset(ifibss->bssid, 0, ETH_ALEN);
1298         ifibss->ssid_len = 0;
1299 
1300         sta_info_flush(sdata);
1301 
1302         spin_lock_bh(&ifibss->incomplete_lock);
1303         while (!list_empty(&ifibss->incomplete_stations)) {
1304                 sta = list_first_entry(&ifibss->incomplete_stations,
1305                                        struct sta_info, list);
1306                 list_del(&sta->list);
1307                 spin_unlock_bh(&ifibss->incomplete_lock);
1308 
1309                 sta_info_free(local, sta);
1310                 spin_lock_bh(&ifibss->incomplete_lock);
1311         }
1312         spin_unlock_bh(&ifibss->incomplete_lock);
1313 
1314         netif_carrier_off(sdata->dev);
1315 
1316         /* remove beacon */
1317         kfree(sdata->u.ibss.ie);
1318         presp = rcu_dereference_protected(ifibss->presp,
1319                                           lockdep_is_held(&sdata->wdev.mtx));
1320         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
1321 
1322         /* on the next join, re-program HT parameters */
1323         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1324         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1325 
1326         sdata->vif.bss_conf.ibss_joined = false;
1327         sdata->vif.bss_conf.ibss_creator = false;
1328         sdata->vif.bss_conf.enable_beacon = false;
1329         sdata->vif.bss_conf.ssid_len = 0;
1330         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
1331         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1332                                                 BSS_CHANGED_IBSS);
1333         ieee80211_vif_release_channel(sdata);
1334         synchronize_rcu();
1335         kfree(presp);
1336 
1337         skb_queue_purge(&sdata->skb_queue);
1338 
1339         del_timer_sync(&sdata->u.ibss.timer);
1340 
1341         return 0;
1342 }
1343 

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