?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[linux-2.6.git] / net / mac80211 / ibss.c
blob531be040b9ae85972d61bf7df248ae28308d811b
1 /*
2 * IBSS mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15 #include <linux/delay.h>
16 #include <linux/slab.h>
17 #include <linux/if_ether.h>
18 #include <linux/skbuff.h>
19 #include <linux/if_arp.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rtnetlink.h>
22 #include <net/mac80211.h>
23
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
26 #include "rate.h"
27
28 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
30
31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
33 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
34
35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
36
37 static struct beacon_data *
38 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
39 const int beacon_int, const u32 basic_rates,
40 const u16 capability, u64 tsf,
41 struct cfg80211_chan_def *chandef,
42 bool *have_higher_than_11mbit,
43 struct cfg80211_csa_settings *csa_settings)
44 {
45 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
46 struct ieee80211_local *local = sdata->local;
47 int rates_n = 0, i, ri;
48 struct ieee80211_mgmt *mgmt;
49 u8 *pos;
50 struct ieee80211_supported_band *sband;
51 u32 rate_flags, rates = 0, rates_added = 0;
52 struct beacon_data *presp;
53 int frame_len;
54 int shift;
55
56 /* Build IBSS probe response */
57 frame_len = sizeof(struct ieee80211_hdr_3addr) +
58 12 /* struct ieee80211_mgmt.u.beacon */ +
59 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
60 2 + 8 /* max Supported Rates */ +
61 3 /* max DS params */ +
62 4 /* IBSS params */ +
63 5 /* Channel Switch Announcement */ +
64 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
65 2 + sizeof(struct ieee80211_ht_cap) +
66 2 + sizeof(struct ieee80211_ht_operation) +
67 ifibss->ie_len;
68 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
69 if (!presp)
70 return NULL;
71
72 presp->head = (void *)(presp + 1);
73
74 mgmt = (void *) presp->head;
75 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
76 IEEE80211_STYPE_PROBE_RESP);
77 eth_broadcast_addr(mgmt->da);
78 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
79 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
80 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
81 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
82 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
83
84 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
85
86 *pos++ = WLAN_EID_SSID;
87 *pos++ = ifibss->ssid_len;
88 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
89 pos += ifibss->ssid_len;
90
91 sband = local->hw.wiphy->bands[chandef->chan->band];
92 rate_flags = ieee80211_chandef_rate_flags(chandef);
93 shift = ieee80211_chandef_get_shift(chandef);
94 rates_n = 0;
95 if (have_higher_than_11mbit)
96 *have_higher_than_11mbit = false;
97
98 for (i = 0; i < sband->n_bitrates; i++) {
99 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
100 continue;
101 if (sband->bitrates[i].bitrate > 110 &&
102 have_higher_than_11mbit)
103 *have_higher_than_11mbit = true;
104
105 rates |= BIT(i);
106 rates_n++;
107 }
108
109 *pos++ = WLAN_EID_SUPP_RATES;
110 *pos++ = min_t(int, 8, rates_n);
111 for (ri = 0; ri < sband->n_bitrates; ri++) {
112 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
113 5 * (1 << shift));
114 u8 basic = 0;
115 if (!(rates & BIT(ri)))
116 continue;
117
118 if (basic_rates & BIT(ri))
119 basic = 0x80;
120 *pos++ = basic | (u8) rate;
121 if (++rates_added == 8) {
122 ri++; /* continue at next rate for EXT_SUPP_RATES */
123 break;
124 }
125 }
126
127 if (sband->band == IEEE80211_BAND_2GHZ) {
128 *pos++ = WLAN_EID_DS_PARAMS;
129 *pos++ = 1;
130 *pos++ = ieee80211_frequency_to_channel(
131 chandef->chan->center_freq);
132 }
133
134 *pos++ = WLAN_EID_IBSS_PARAMS;
135 *pos++ = 2;
136 /* FIX: set ATIM window based on scan results */
137 *pos++ = 0;
138 *pos++ = 0;
139
140 if (csa_settings) {
141 *pos++ = WLAN_EID_CHANNEL_SWITCH;
142 *pos++ = 3;
143 *pos++ = csa_settings->block_tx ? 1 : 0;
144 *pos++ = ieee80211_frequency_to_channel(
145 csa_settings->chandef.chan->center_freq);
146 sdata->csa_counter_offset_beacon = (pos - presp->head);
147 *pos++ = csa_settings->count;
148 }
149
150 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
151 if (rates_n > 8) {
152 *pos++ = WLAN_EID_EXT_SUPP_RATES;
153 *pos++ = rates_n - 8;
154 for (; ri < sband->n_bitrates; ri++) {
155 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
156 5 * (1 << shift));
157 u8 basic = 0;
158 if (!(rates & BIT(ri)))
159 continue;
160
161 if (basic_rates & BIT(ri))
162 basic = 0x80;
163 *pos++ = basic | (u8) rate;
164 }
165 }
166
167 if (ifibss->ie_len) {
168 memcpy(pos, ifibss->ie, ifibss->ie_len);
169 pos += ifibss->ie_len;
170 }
171
172 /* add HT capability and information IEs */
173 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
174 chandef->width != NL80211_CHAN_WIDTH_5 &&
175 chandef->width != NL80211_CHAN_WIDTH_10 &&
176 sband->ht_cap.ht_supported) {
177 struct ieee80211_sta_ht_cap ht_cap;
178
179 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
180 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
181
182 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
183 /*
184 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
185 * field and RIFS Mode are reserved in IBSS mode, therefore
186 * keep them at 0
187 */
188 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
189 chandef, 0);
190 }
191
192 if (local->hw.queues >= IEEE80211_NUM_ACS) {
193 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
194 *pos++ = 7; /* len */
195 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
196 *pos++ = 0x50;
197 *pos++ = 0xf2;
198 *pos++ = 2; /* WME */
199 *pos++ = 0; /* WME info */
200 *pos++ = 1; /* WME ver */
201 *pos++ = 0; /* U-APSD no in use */
202 }
203
204 presp->head_len = pos - presp->head;
205 if (WARN_ON(presp->head_len > frame_len))
206 goto error;
207
208 return presp;
209 error:
210 kfree(presp);
211 return NULL;
212 }
213
214 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
215 const u8 *bssid, const int beacon_int,
216 struct cfg80211_chan_def *req_chandef,
217 const u32 basic_rates,
218 const u16 capability, u64 tsf,
219 bool creator)
220 {
221 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
222 struct ieee80211_local *local = sdata->local;
223 struct ieee80211_supported_band *sband;
224 struct ieee80211_mgmt *mgmt;
225 struct cfg80211_bss *bss;
226 u32 bss_change;
227 struct cfg80211_chan_def chandef;
228 struct ieee80211_channel *chan;
229 struct beacon_data *presp;
230 enum nl80211_bss_scan_width scan_width;
231 bool have_higher_than_11mbit;
232 bool radar_required = false;
233 int err;
234
235 sdata_assert_lock(sdata);
236
237 /* Reset own TSF to allow time synchronization work. */
238 drv_reset_tsf(local, sdata);
239
240 if (!ether_addr_equal(ifibss->bssid, bssid))
241 sta_info_flush(sdata);
242
243 /* if merging, indicate to driver that we leave the old IBSS */
244 if (sdata->vif.bss_conf.ibss_joined) {
245 sdata->vif.bss_conf.ibss_joined = false;
246 sdata->vif.bss_conf.ibss_creator = false;
247 sdata->vif.bss_conf.enable_beacon = false;
248 netif_carrier_off(sdata->dev);
249 ieee80211_bss_info_change_notify(sdata,
250 BSS_CHANGED_IBSS |
251 BSS_CHANGED_BEACON_ENABLED);
252 drv_leave_ibss(local, sdata);
253 }
254
255 presp = rcu_dereference_protected(ifibss->presp,
256 lockdep_is_held(&sdata->wdev.mtx));
257 rcu_assign_pointer(ifibss->presp, NULL);
258 if (presp)
259 kfree_rcu(presp, rcu_head);
260
261 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
262
263 /* make a copy of the chandef, it could be modified below. */
264 chandef = *req_chandef;
265 chan = chandef.chan;
266 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
267 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
268 chandef.width == NL80211_CHAN_WIDTH_10 ||
269 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
270 chandef.width == NL80211_CHAN_WIDTH_20) {
271 sdata_info(sdata,
272 "Failed to join IBSS, beacons forbidden\n");
273 return;
274 }
275 chandef.width = NL80211_CHAN_WIDTH_20;
276 chandef.center_freq1 = chan->center_freq;
277 /* check again for downgraded chandef */
278 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
279 sdata_info(sdata,
280 "Failed to join IBSS, beacons forbidden\n");
281 return;
282 }
283 }
284
285 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
286 &chandef);
287 if (err > 0) {
288 if (!ifibss->userspace_handles_dfs) {
289 sdata_info(sdata,
290 "Failed to join IBSS, DFS channel without control program\n");
291 return;
292 }
293 radar_required = true;
294 }
295
296 ieee80211_vif_release_channel(sdata);
297 if (ieee80211_vif_use_channel(sdata, &chandef,
298 ifibss->fixed_channel ?
299 IEEE80211_CHANCTX_SHARED :
300 IEEE80211_CHANCTX_EXCLUSIVE)) {
301 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
302 return;
303 }
304
305 memcpy(ifibss->bssid, bssid, ETH_ALEN);
306
307 sband = local->hw.wiphy->bands[chan->band];
308
309 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
310 capability, tsf, &chandef,
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->radar_required = radar_required;
319 sdata->vif.bss_conf.enable_beacon = true;
320 sdata->vif.bss_conf.beacon_int = beacon_int;
321 sdata->vif.bss_conf.basic_rates = basic_rates;
322 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
323 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
324 bss_change = BSS_CHANGED_BEACON_INT;
325 bss_change |= ieee80211_reset_erp_info(sdata);
326 bss_change |= BSS_CHANGED_BSSID;
327 bss_change |= BSS_CHANGED_BEACON;
328 bss_change |= BSS_CHANGED_BEACON_ENABLED;
329 bss_change |= BSS_CHANGED_BASIC_RATES;
330 bss_change |= BSS_CHANGED_HT;
331 bss_change |= BSS_CHANGED_IBSS;
332 bss_change |= BSS_CHANGED_SSID;
333
334 /*
335 * In 5 GHz/802.11a, we can always use short slot time.
336 * (IEEE 802.11-2012 18.3.8.7)
337 *
338 * In 2.4GHz, we must always use long slots in IBSS for compatibility
339 * reasons.
340 * (IEEE 802.11-2012 19.4.5)
341 *
342 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
343 */
344 sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
345 bss_change |= BSS_CHANGED_ERP_SLOT;
346
347 /* cf. IEEE 802.11 9.2.12 */
348 if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
349 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
350 else
351 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
352
353 ieee80211_set_wmm_default(sdata, true);
354
355 sdata->vif.bss_conf.ibss_joined = true;
356 sdata->vif.bss_conf.ibss_creator = creator;
357
358 err = drv_join_ibss(local, sdata);
359 if (err) {
360 sdata->vif.bss_conf.ibss_joined = false;
361 sdata->vif.bss_conf.ibss_creator = false;
362 sdata->vif.bss_conf.enable_beacon = false;
363 sdata->vif.bss_conf.ssid_len = 0;
364 RCU_INIT_POINTER(ifibss->presp, NULL);
365 kfree_rcu(presp, rcu_head);
366 ieee80211_vif_release_channel(sdata);
367 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
368 err);
369 return;
370 }
371
372 ieee80211_bss_info_change_notify(sdata, bss_change);
373
374 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
375 mod_timer(&ifibss->timer,
376 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
377
378 scan_width = cfg80211_chandef_to_scan_width(&chandef);
379 bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan,
380 scan_width, mgmt,
381 presp->head_len, 0, GFP_KERNEL);
382 cfg80211_put_bss(local->hw.wiphy, bss);
383 netif_carrier_on(sdata->dev);
384 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
385 }
386
387 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
388 struct ieee80211_bss *bss)
389 {
390 struct cfg80211_bss *cbss =
391 container_of((void *)bss, struct cfg80211_bss, priv);
392 struct ieee80211_supported_band *sband;
393 struct cfg80211_chan_def chandef;
394 u32 basic_rates;
395 int i, j;
396 u16 beacon_int = cbss->beacon_interval;
397 const struct cfg80211_bss_ies *ies;
398 enum nl80211_channel_type chan_type;
399 u64 tsf;
400 u32 rate_flags;
401 int shift;
402
403 sdata_assert_lock(sdata);
404
405 if (beacon_int < 10)
406 beacon_int = 10;
407
408 switch (sdata->u.ibss.chandef.width) {
409 case NL80211_CHAN_WIDTH_20_NOHT:
410 case NL80211_CHAN_WIDTH_20:
411 case NL80211_CHAN_WIDTH_40:
412 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
413 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
414 break;
415 case NL80211_CHAN_WIDTH_5:
416 case NL80211_CHAN_WIDTH_10:
417 cfg80211_chandef_create(&chandef, cbss->channel,
418 NL80211_CHAN_WIDTH_20_NOHT);
419 chandef.width = sdata->u.ibss.chandef.width;
420 break;
421 default:
422 /* fall back to 20 MHz for unsupported modes */
423 cfg80211_chandef_create(&chandef, cbss->channel,
424 NL80211_CHAN_WIDTH_20_NOHT);
425 break;
426 }
427
428 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
429 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
430 shift = ieee80211_vif_get_shift(&sdata->vif);
431
432 basic_rates = 0;
433
434 for (i = 0; i < bss->supp_rates_len; i++) {
435 int rate = bss->supp_rates[i] & 0x7f;
436 bool is_basic = !!(bss->supp_rates[i] & 0x80);
437
438 for (j = 0; j < sband->n_bitrates; j++) {
439 int brate;
440 if ((rate_flags & sband->bitrates[j].flags)
441 != rate_flags)
442 continue;
443
444 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
445 5 * (1 << shift));
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
467 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
468 struct cfg80211_csa_settings *csa_settings)
469 {
470 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
471 struct beacon_data *presp, *old_presp;
472 struct cfg80211_bss *cbss;
473 const struct cfg80211_bss_ies *ies;
474 u16 capability;
475 u64 tsf;
476 int ret = 0;
477
478 sdata_assert_lock(sdata);
479
480 capability = WLAN_CAPABILITY_IBSS;
481
482 if (ifibss->privacy)
483 capability |= WLAN_CAPABILITY_PRIVACY;
484
485 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
486 ifibss->bssid, ifibss->ssid,
487 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
488 WLAN_CAPABILITY_PRIVACY,
489 capability);
490
491 if (WARN_ON(!cbss)) {
492 ret = -EINVAL;
493 goto out;
494 }
495
496 rcu_read_lock();
497 ies = rcu_dereference(cbss->ies);
498 tsf = ies->tsf;
499 rcu_read_unlock();
500 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
501
502 old_presp = rcu_dereference_protected(ifibss->presp,
503 lockdep_is_held(&sdata->wdev.mtx));
504
505 presp = ieee80211_ibss_build_presp(sdata,
506 sdata->vif.bss_conf.beacon_int,
507 sdata->vif.bss_conf.basic_rates,
508 capability, tsf, &ifibss->chandef,
509 NULL, csa_settings);
510 if (!presp) {
511 ret = -ENOMEM;
512 goto out;
513 }
514
515 rcu_assign_pointer(ifibss->presp, presp);
516 if (old_presp)
517 kfree_rcu(old_presp, rcu_head);
518
519 /* it might not send the beacon for a while. send an action frame
520 * immediately to announce the channel switch.
521 */
522 if (csa_settings)
523 ieee80211_send_action_csa(sdata, csa_settings);
524
525 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
526 out:
527 return ret;
528 }
529
530 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
531 {
532 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
533 struct cfg80211_bss *cbss;
534 int err;
535 u16 capability;
536
537 sdata_lock(sdata);
538 /* update cfg80211 bss information with the new channel */
539 if (!is_zero_ether_addr(ifibss->bssid)) {
540 capability = WLAN_CAPABILITY_IBSS;
541
542 if (ifibss->privacy)
543 capability |= WLAN_CAPABILITY_PRIVACY;
544
545 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
546 ifibss->chandef.chan,
547 ifibss->bssid, ifibss->ssid,
548 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
549 WLAN_CAPABILITY_PRIVACY,
550 capability);
551 /* XXX: should not really modify cfg80211 data */
552 if (cbss) {
553 cbss->channel = sdata->local->csa_chandef.chan;
554 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
555 }
556 }
557
558 ifibss->chandef = sdata->local->csa_chandef;
559
560 /* generate the beacon */
561 err = ieee80211_ibss_csa_beacon(sdata, NULL);
562 sdata_unlock(sdata);
563 if (err < 0)
564 return err;
565
566 return 0;
567 }
568
569 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
570 {
571 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
572
573 cancel_work_sync(&ifibss->csa_connection_drop_work);
574 }
575
576 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
577 __acquires(RCU)
578 {
579 struct ieee80211_sub_if_data *sdata = sta->sdata;
580 u8 addr[ETH_ALEN];
581
582 memcpy(addr, sta->sta.addr, ETH_ALEN);
583
584 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
585
586 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
587 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
588 /* authorize the station only if the network is not RSN protected. If
589 * not wait for the userspace to authorize it */
590 if (!sta->sdata->u.ibss.control_port)
591 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
592
593 rate_control_rate_init(sta);
594
595 /* If it fails, maybe we raced another insertion? */
596 if (sta_info_insert_rcu(sta))
597 return sta_info_get(sdata, addr);
598 return sta;
599 }
600
601 static struct sta_info *
602 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
603 const u8 *addr, u32 supp_rates)
604 __acquires(RCU)
605 {
606 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
607 struct ieee80211_local *local = sdata->local;
608 struct sta_info *sta;
609 struct ieee80211_chanctx_conf *chanctx_conf;
610 struct ieee80211_supported_band *sband;
611 enum nl80211_bss_scan_width scan_width;
612 int band;
613
614 /*
615 * XXX: Consider removing the least recently used entry and
616 * allow new one to be added.
617 */
618 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
619 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
620 sdata->name, addr);
621 rcu_read_lock();
622 return NULL;
623 }
624
625 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
626 rcu_read_lock();
627 return NULL;
628 }
629
630 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
631 rcu_read_lock();
632 return NULL;
633 }
634
635 rcu_read_lock();
636 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
637 if (WARN_ON_ONCE(!chanctx_conf))
638 return NULL;
639 band = chanctx_conf->def.chan->band;
640 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
641 rcu_read_unlock();
642
643 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
644 if (!sta) {
645 rcu_read_lock();
646 return NULL;
647 }
648
649 sta->last_rx = jiffies;
650
651 /* make sure mandatory rates are always added */
652 sband = local->hw.wiphy->bands[band];
653 sta->sta.supp_rates[band] = supp_rates |
654 ieee80211_mandatory_rates(sband, scan_width);
655
656 return ieee80211_ibss_finish_sta(sta);
657 }
658
659 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
660 {
661 struct ieee80211_local *local = sdata->local;
662 int active = 0;
663 struct sta_info *sta;
664
665 sdata_assert_lock(sdata);
666
667 rcu_read_lock();
668
669 list_for_each_entry_rcu(sta, &local->sta_list, list) {
670 if (sta->sdata == sdata &&
671 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
672 jiffies)) {
673 active++;
674 break;
675 }
676 }
677
678 rcu_read_unlock();
679
680 return active;
681 }
682
683 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
684 {
685 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
686 struct ieee80211_local *local = sdata->local;
687 struct cfg80211_bss *cbss;
688 struct beacon_data *presp;
689 struct sta_info *sta;
690 int active_ibss;
691 u16 capability;
692
693 active_ibss = ieee80211_sta_active_ibss(sdata);
694
695 if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
696 capability = WLAN_CAPABILITY_IBSS;
697
698 if (ifibss->privacy)
699 capability |= WLAN_CAPABILITY_PRIVACY;
700
701 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
702 ifibss->bssid, ifibss->ssid,
703 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
704 WLAN_CAPABILITY_PRIVACY,
705 capability);
706
707 if (cbss) {
708 cfg80211_unlink_bss(local->hw.wiphy, cbss);
709 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
710 }
711 }
712
713 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
714
715 sta_info_flush(sdata);
716
717 spin_lock_bh(&ifibss->incomplete_lock);
718 while (!list_empty(&ifibss->incomplete_stations)) {
719 sta = list_first_entry(&ifibss->incomplete_stations,
720 struct sta_info, list);
721 list_del(&sta->list);
722 spin_unlock_bh(&ifibss->incomplete_lock);
723
724 sta_info_free(local, sta);
725 spin_lock_bh(&ifibss->incomplete_lock);
726 }
727 spin_unlock_bh(&ifibss->incomplete_lock);
728
729 netif_carrier_off(sdata->dev);
730
731 sdata->vif.bss_conf.ibss_joined = false;
732 sdata->vif.bss_conf.ibss_creator = false;
733 sdata->vif.bss_conf.enable_beacon = false;
734 sdata->vif.bss_conf.ssid_len = 0;
735
736 /* remove beacon */
737 presp = rcu_dereference_protected(ifibss->presp,
738 lockdep_is_held(&sdata->wdev.mtx));
739 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
740 if (presp)
741 kfree_rcu(presp, rcu_head);
742
743 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
744 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
745 BSS_CHANGED_IBSS);
746 drv_leave_ibss(local, sdata);
747 ieee80211_vif_release_channel(sdata);
748 }
749
750 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
751 {
752 struct ieee80211_sub_if_data *sdata =
753 container_of(work, struct ieee80211_sub_if_data,
754 u.ibss.csa_connection_drop_work);
755
756 ieee80211_ibss_disconnect(sdata);
757 synchronize_rcu();
758 skb_queue_purge(&sdata->skb_queue);
759
760 /* trigger a scan to find another IBSS network to join */
761 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
762 }
763
764 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
765 {
766 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
767 int err;
768
769 /* if the current channel is a DFS channel, mark the channel as
770 * unavailable.
771 */
772 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
773 &ifibss->chandef);
774 if (err > 0)
775 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
776 GFP_ATOMIC);
777 }
778
779 static bool
780 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
781 struct ieee802_11_elems *elems,
782 bool beacon)
783 {
784 struct cfg80211_csa_settings params;
785 struct ieee80211_csa_ie csa_ie;
786 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
787 struct ieee80211_chanctx_conf *chanctx_conf;
788 struct ieee80211_chanctx *chanctx;
789 enum nl80211_channel_type ch_type;
790 int err, num_chanctx;
791 u32 sta_flags;
792
793 if (sdata->vif.csa_active)
794 return true;
795
796 if (!sdata->vif.bss_conf.ibss_joined)
797 return false;
798
799 sta_flags = IEEE80211_STA_DISABLE_VHT;
800 switch (ifibss->chandef.width) {
801 case NL80211_CHAN_WIDTH_5:
802 case NL80211_CHAN_WIDTH_10:
803 case NL80211_CHAN_WIDTH_20_NOHT:
804 sta_flags |= IEEE80211_STA_DISABLE_HT;
805 /* fall through */
806 case NL80211_CHAN_WIDTH_20:
807 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
808 break;
809 default:
810 break;
811 }
812
813 memset(&params, 0, sizeof(params));
814 memset(&csa_ie, 0, sizeof(csa_ie));
815 err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon,
816 ifibss->chandef.chan->band,
817 sta_flags, ifibss->bssid, &csa_ie);
818 /* can't switch to destination channel, fail */
819 if (err < 0)
820 goto disconnect;
821
822 /* did not contain a CSA */
823 if (err)
824 return false;
825
826 params.count = csa_ie.count;
827 params.chandef = csa_ie.chandef;
828
829 if (ifibss->chandef.chan->band != params.chandef.chan->band)
830 goto disconnect;
831
832 switch (ifibss->chandef.width) {
833 case NL80211_CHAN_WIDTH_20_NOHT:
834 case NL80211_CHAN_WIDTH_20:
835 case NL80211_CHAN_WIDTH_40:
836 /* keep our current HT mode (HT20/HT40+/HT40-), even if
837 * another mode has been announced. The mode is not adopted
838 * within the beacon while doing CSA and we should therefore
839 * keep the mode which we announce.
840 */
841 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
842 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
843 ch_type);
844 break;
845 case NL80211_CHAN_WIDTH_5:
846 case NL80211_CHAN_WIDTH_10:
847 if (params.chandef.width != ifibss->chandef.width) {
848 sdata_info(sdata,
849 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
850 ifibss->bssid,
851 params.chandef.chan->center_freq,
852 params.chandef.width,
853 params.chandef.center_freq1,
854 params.chandef.center_freq2);
855 goto disconnect;
856 }
857 break;
858 default:
859 /* should not happen, sta_flags should prevent VHT modes. */
860 WARN_ON(1);
861 goto disconnect;
862 }
863
864 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef)) {
865 sdata_info(sdata,
866 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
867 ifibss->bssid,
868 params.chandef.chan->center_freq,
869 params.chandef.width,
870 params.chandef.center_freq1,
871 params.chandef.center_freq2);
872 goto disconnect;
873 }
874
875 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
876 &params.chandef);
877 if (err < 0)
878 goto disconnect;
879 if (err) {
880 /* IBSS-DFS only allowed with a control program */
881 if (!ifibss->userspace_handles_dfs)
882 goto disconnect;
883
884 params.radar_required = true;
885 }
886
887 rcu_read_lock();
888 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
889 if (!chanctx_conf) {
890 rcu_read_unlock();
891 goto disconnect;
892 }
893
894 /* don't handle for multi-VIF cases */
895 chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
896 if (chanctx->refcount > 1) {
897 rcu_read_unlock();
898 goto disconnect;
899 }
900 num_chanctx = 0;
901 list_for_each_entry_rcu(chanctx, &sdata->local->chanctx_list, list)
902 num_chanctx++;
903
904 if (num_chanctx > 1) {
905 rcu_read_unlock();
906 goto disconnect;
907 }
908 rcu_read_unlock();
909
910 /* all checks done, now perform the channel switch. */
911 ibss_dbg(sdata,
912 "received channel switch announcement to go to channel %d MHz\n",
913 params.chandef.chan->center_freq);
914
915 params.block_tx = !!csa_ie.mode;
916
917 ieee80211_ibss_csa_beacon(sdata, &params);
918 sdata->csa_radar_required = params.radar_required;
919
920 if (params.block_tx)
921 ieee80211_stop_queues_by_reason(&sdata->local->hw,
922 IEEE80211_MAX_QUEUE_MAP,
923 IEEE80211_QUEUE_STOP_REASON_CSA);
924
925 sdata->local->csa_chandef = params.chandef;
926 sdata->vif.csa_active = true;
927
928 ieee80211_bss_info_change_notify(sdata, err);
929 drv_channel_switch_beacon(sdata, &params.chandef);
930
931 ieee80211_ibss_csa_mark_radar(sdata);
932
933 return true;
934 disconnect:
935 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
936 ieee80211_queue_work(&sdata->local->hw,
937 &ifibss->csa_connection_drop_work);
938
939 ieee80211_ibss_csa_mark_radar(sdata);
940
941 return true;
942 }
943
944 static void
945 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
946 struct ieee80211_mgmt *mgmt, size_t len,
947 struct ieee80211_rx_status *rx_status,
948 struct ieee802_11_elems *elems)
949 {
950 int required_len;
951
952 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
953 return;
954
955 /* CSA is the only action we handle for now */
956 if (mgmt->u.action.u.measurement.action_code !=
957 WLAN_ACTION_SPCT_CHL_SWITCH)
958 return;
959
960 required_len = IEEE80211_MIN_ACTION_SIZE +
961 sizeof(mgmt->u.action.u.chan_switch);
962 if (len < required_len)
963 return;
964
965 ieee80211_ibss_process_chanswitch(sdata, elems, false);
966 }
967
968 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
969 struct ieee80211_mgmt *mgmt,
970 size_t len)
971 {
972 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
973
974 if (len < IEEE80211_DEAUTH_FRAME_LEN)
975 return;
976
977 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
978 mgmt->sa, mgmt->da, mgmt->bssid, reason);
979 sta_info_destroy_addr(sdata, mgmt->sa);
980 }
981
982 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
983 struct ieee80211_mgmt *mgmt,
984 size_t len)
985 {
986 u16 auth_alg, auth_transaction;
987
988 sdata_assert_lock(sdata);
989
990 if (len < 24 + 6)
991 return;
992
993 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
994 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
995
996 ibss_dbg(sdata,
997 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
998 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
999
1000 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1001 return;
1002
1003 /*
1004 * IEEE 802.11 standard does not require authentication in IBSS
1005 * networks and most implementations do not seem to use it.
1006 * However, try to reply to authentication attempts if someone
1007 * has actually implemented this.
1008 */
1009 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
1010 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
1011 }
1012
1013 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1014 struct ieee80211_mgmt *mgmt, size_t len,
1015 struct ieee80211_rx_status *rx_status,
1016 struct ieee802_11_elems *elems)
1017 {
1018 struct ieee80211_local *local = sdata->local;
1019 int freq;
1020 struct cfg80211_bss *cbss;
1021 struct ieee80211_bss *bss;
1022 struct sta_info *sta;
1023 struct ieee80211_channel *channel;
1024 u64 beacon_timestamp, rx_timestamp;
1025 u32 supp_rates = 0;
1026 enum ieee80211_band band = rx_status->band;
1027 enum nl80211_bss_scan_width scan_width;
1028 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
1029 bool rates_updated = false;
1030
1031 if (elems->ds_params)
1032 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1033 band);
1034 else
1035 freq = rx_status->freq;
1036
1037 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1038
1039 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1040 return;
1041
1042 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1043 ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
1044
1045 rcu_read_lock();
1046 sta = sta_info_get(sdata, mgmt->sa);
1047
1048 if (elems->supp_rates) {
1049 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1050 band, NULL);
1051 if (sta) {
1052 u32 prev_rates;
1053
1054 prev_rates = sta->sta.supp_rates[band];
1055 /* make sure mandatory rates are always added */
1056 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1057 if (rx_status->flag & RX_FLAG_5MHZ)
1058 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1059 if (rx_status->flag & RX_FLAG_10MHZ)
1060 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1061
1062 sta->sta.supp_rates[band] = supp_rates |
1063 ieee80211_mandatory_rates(sband,
1064 scan_width);
1065 if (sta->sta.supp_rates[band] != prev_rates) {
1066 ibss_dbg(sdata,
1067 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1068 sta->sta.addr, prev_rates,
1069 sta->sta.supp_rates[band]);
1070 rates_updated = true;
1071 }
1072 } else {
1073 rcu_read_unlock();
1074 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1075 mgmt->sa, supp_rates);
1076 }
1077 }
1078
1079 if (sta && elems->wmm_info)
1080 set_sta_flag(sta, WLAN_STA_WME);
1081
1082 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1083 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1084 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1085 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1086 /* we both use HT */
1087 struct ieee80211_ht_cap htcap_ie;
1088 struct cfg80211_chan_def chandef;
1089
1090 ieee80211_ht_oper_to_chandef(channel,
1091 elems->ht_operation,
1092 &chandef);
1093
1094 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1095
1096 /*
1097 * fall back to HT20 if we don't use or use
1098 * the other extension channel
1099 */
1100 if (chandef.center_freq1 !=
1101 sdata->u.ibss.chandef.center_freq1)
1102 htcap_ie.cap_info &=
1103 cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
1104
1105 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
1106 sdata, sband, &htcap_ie, sta);
1107 }
1108
1109 if (sta && rates_updated) {
1110 drv_sta_rc_update(local, sdata, &sta->sta,
1111 IEEE80211_RC_SUPP_RATES_CHANGED);
1112 rate_control_rate_init(sta);
1113 }
1114
1115 rcu_read_unlock();
1116 }
1117
1118 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1119 channel);
1120 if (!bss)
1121 return;
1122
1123 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1124
1125 /* same for beacon and probe response */
1126 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1127
1128 /* check if we need to merge IBSS */
1129
1130 /* not an IBSS */
1131 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1132 goto put_bss;
1133
1134 /* different channel */
1135 if (sdata->u.ibss.fixed_channel &&
1136 sdata->u.ibss.chandef.chan != cbss->channel)
1137 goto put_bss;
1138
1139 /* different SSID */
1140 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1141 memcmp(elems->ssid, sdata->u.ibss.ssid,
1142 sdata->u.ibss.ssid_len))
1143 goto put_bss;
1144
1145 /* process channel switch */
1146 if (ieee80211_ibss_process_chanswitch(sdata, elems, true))
1147 goto put_bss;
1148
1149 /* same BSSID */
1150 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1151 goto put_bss;
1152
1153 /* we use a fixed BSSID */
1154 if (sdata->u.ibss.fixed_bssid)
1155 goto put_bss;
1156
1157 if (ieee80211_have_rx_timestamp(rx_status)) {
1158 /* time when timestamp field was received */
1159 rx_timestamp =
1160 ieee80211_calculate_rx_timestamp(local, rx_status,
1161 len + FCS_LEN, 24);
1162 } else {
1163 /*
1164 * second best option: get current TSF
1165 * (will return -1 if not supported)
1166 */
1167 rx_timestamp = drv_get_tsf(local, sdata);
1168 }
1169
1170 ibss_dbg(sdata,
1171 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1172 mgmt->sa, mgmt->bssid,
1173 (unsigned long long)rx_timestamp,
1174 (unsigned long long)beacon_timestamp,
1175 (unsigned long long)(rx_timestamp - beacon_timestamp),
1176 jiffies);
1177
1178 if (beacon_timestamp > rx_timestamp) {
1179 ibss_dbg(sdata,
1180 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1181 mgmt->bssid);
1182 ieee80211_sta_join_ibss(sdata, bss);
1183 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1184 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1185 supp_rates);
1186 rcu_read_unlock();
1187 }
1188
1189 put_bss:
1190 ieee80211_rx_bss_put(local, bss);
1191 }
1192
1193 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1194 const u8 *bssid, const u8 *addr,
1195 u32 supp_rates)
1196 {
1197 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1198 struct ieee80211_local *local = sdata->local;
1199 struct sta_info *sta;
1200 struct ieee80211_chanctx_conf *chanctx_conf;
1201 struct ieee80211_supported_band *sband;
1202 enum nl80211_bss_scan_width scan_width;
1203 int band;
1204
1205 /*
1206 * XXX: Consider removing the least recently used entry and
1207 * allow new one to be added.
1208 */
1209 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1210 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1211 sdata->name, addr);
1212 return;
1213 }
1214
1215 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1216 return;
1217
1218 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1219 return;
1220
1221 rcu_read_lock();
1222 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1223 if (WARN_ON_ONCE(!chanctx_conf)) {
1224 rcu_read_unlock();
1225 return;
1226 }
1227 band = chanctx_conf->def.chan->band;
1228 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1229 rcu_read_unlock();
1230
1231 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1232 if (!sta)
1233 return;
1234
1235 sta->last_rx = jiffies;
1236
1237 /* make sure mandatory rates are always added */
1238 sband = local->hw.wiphy->bands[band];
1239 sta->sta.supp_rates[band] = supp_rates |
1240 ieee80211_mandatory_rates(sband, scan_width);
1241
1242 spin_lock(&ifibss->incomplete_lock);
1243 list_add(&sta->list, &ifibss->incomplete_stations);
1244 spin_unlock(&ifibss->incomplete_lock);
1245 ieee80211_queue_work(&local->hw, &sdata->work);
1246 }
1247
1248 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1249 {
1250 struct ieee80211_local *local = sdata->local;
1251 struct sta_info *sta, *tmp;
1252 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1253 unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1254
1255 mutex_lock(&local->sta_mtx);
1256
1257 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1258 if (sdata != sta->sdata)
1259 continue;
1260
1261 if (time_after(jiffies, sta->last_rx + exp_time) ||
1262 (time_after(jiffies, sta->last_rx + exp_rsn_time) &&
1263 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1264 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1265 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1266 "not authorized " : "", sta->sta.addr);
1267
1268 WARN_ON(__sta_info_destroy(sta));
1269 }
1270 }
1271
1272 mutex_unlock(&local->sta_mtx);
1273 }
1274
1275 /*
1276 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1277 */
1278
1279 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1280 {
1281 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1282 enum nl80211_bss_scan_width scan_width;
1283
1284 sdata_assert_lock(sdata);
1285
1286 mod_timer(&ifibss->timer,
1287 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1288
1289 ieee80211_ibss_sta_expire(sdata);
1290
1291 if (time_before(jiffies, ifibss->last_scan_completed +
1292 IEEE80211_IBSS_MERGE_INTERVAL))
1293 return;
1294
1295 if (ieee80211_sta_active_ibss(sdata))
1296 return;
1297
1298 if (ifibss->fixed_channel)
1299 return;
1300
1301 sdata_info(sdata,
1302 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1303
1304 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1305 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1306 NULL, scan_width);
1307 }
1308
1309 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1310 {
1311 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1312 u8 bssid[ETH_ALEN];
1313 u16 capability;
1314 int i;
1315
1316 sdata_assert_lock(sdata);
1317
1318 if (ifibss->fixed_bssid) {
1319 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1320 } else {
1321 /* Generate random, not broadcast, locally administered BSSID. Mix in
1322 * own MAC address to make sure that devices that do not have proper
1323 * random number generator get different BSSID. */
1324 get_random_bytes(bssid, ETH_ALEN);
1325 for (i = 0; i < ETH_ALEN; i++)
1326 bssid[i] ^= sdata->vif.addr[i];
1327 bssid[0] &= ~0x01;
1328 bssid[0] |= 0x02;
1329 }
1330
1331 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1332
1333 capability = WLAN_CAPABILITY_IBSS;
1334
1335 if (ifibss->privacy)
1336 capability |= WLAN_CAPABILITY_PRIVACY;
1337 else
1338 sdata->drop_unencrypted = 0;
1339
1340 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1341 &ifibss->chandef, ifibss->basic_rates,
1342 capability, 0, true);
1343 }
1344
1345 /*
1346 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1347 */
1348
1349 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1350 {
1351 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1352 struct ieee80211_local *local = sdata->local;
1353 struct cfg80211_bss *cbss;
1354 struct ieee80211_channel *chan = NULL;
1355 const u8 *bssid = NULL;
1356 enum nl80211_bss_scan_width scan_width;
1357 int active_ibss;
1358 u16 capability;
1359
1360 sdata_assert_lock(sdata);
1361
1362 active_ibss = ieee80211_sta_active_ibss(sdata);
1363 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1364
1365 if (active_ibss)
1366 return;
1367
1368 capability = WLAN_CAPABILITY_IBSS;
1369 if (ifibss->privacy)
1370 capability |= WLAN_CAPABILITY_PRIVACY;
1371 if (ifibss->fixed_bssid)
1372 bssid = ifibss->bssid;
1373 if (ifibss->fixed_channel)
1374 chan = ifibss->chandef.chan;
1375 if (!is_zero_ether_addr(ifibss->bssid))
1376 bssid = ifibss->bssid;
1377 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1378 ifibss->ssid, ifibss->ssid_len,
1379 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
1380 capability);
1381
1382 if (cbss) {
1383 struct ieee80211_bss *bss;
1384
1385 bss = (void *)cbss->priv;
1386 ibss_dbg(sdata,
1387 "sta_find_ibss: selected %pM current %pM\n",
1388 cbss->bssid, ifibss->bssid);
1389 sdata_info(sdata,
1390 "Selected IBSS BSSID %pM based on configured SSID\n",
1391 cbss->bssid);
1392
1393 ieee80211_sta_join_ibss(sdata, bss);
1394 ieee80211_rx_bss_put(local, bss);
1395 return;
1396 }
1397
1398 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1399 * directly and do not waste time scanning
1400 */
1401 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1402 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1403 bssid);
1404 ieee80211_sta_create_ibss(sdata);
1405 return;
1406 }
1407
1408
1409 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1410
1411 /* Selected IBSS not found in current scan results - try to scan */
1412 if (time_after(jiffies, ifibss->last_scan_completed +
1413 IEEE80211_SCAN_INTERVAL)) {
1414 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1415
1416 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1417 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1418 ifibss->ssid_len, chan,
1419 scan_width);
1420 } else {
1421 int interval = IEEE80211_SCAN_INTERVAL;
1422
1423 if (time_after(jiffies, ifibss->ibss_join_req +
1424 IEEE80211_IBSS_JOIN_TIMEOUT))
1425 ieee80211_sta_create_ibss(sdata);
1426
1427 mod_timer(&ifibss->timer,
1428 round_jiffies(jiffies + interval));
1429 }
1430 }
1431
1432 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1433 struct sk_buff *req)
1434 {
1435 struct ieee80211_mgmt *mgmt = (void *)req->data;
1436 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1437 struct ieee80211_local *local = sdata->local;
1438 int tx_last_beacon, len = req->len;
1439 struct sk_buff *skb;
1440 struct beacon_data *presp;
1441 u8 *pos, *end;
1442
1443 sdata_assert_lock(sdata);
1444
1445 presp = rcu_dereference_protected(ifibss->presp,
1446 lockdep_is_held(&sdata->wdev.mtx));
1447
1448 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1449 len < 24 + 2 || !presp)
1450 return;
1451
1452 tx_last_beacon = drv_tx_last_beacon(local);
1453
1454 ibss_dbg(sdata,
1455 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1456 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1457
1458 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1459 return;
1460
1461 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1462 !is_broadcast_ether_addr(mgmt->bssid))
1463 return;
1464
1465 end = ((u8 *) mgmt) + len;
1466 pos = mgmt->u.probe_req.variable;
1467 if (pos[0] != WLAN_EID_SSID ||
1468 pos + 2 + pos[1] > end) {
1469 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1470 mgmt->sa);
1471 return;
1472 }
1473 if (pos[1] != 0 &&
1474 (pos[1] != ifibss->ssid_len ||
1475 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1476 /* Ignore ProbeReq for foreign SSID */
1477 return;
1478 }
1479
1480 /* Reply with ProbeResp */
1481 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1482 if (!skb)
1483 return;
1484
1485 skb_reserve(skb, local->tx_headroom);
1486 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1487
1488 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1489 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1490 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1491 ieee80211_tx_skb(sdata, skb);
1492 }
1493
1494 static
1495 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1496 struct ieee80211_mgmt *mgmt, size_t len,
1497 struct ieee80211_rx_status *rx_status)
1498 {
1499 size_t baselen;
1500 struct ieee802_11_elems elems;
1501
1502 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1503 offsetof(typeof(mgmt->u.beacon), variable));
1504
1505 /*
1506 * either beacon or probe_resp but the variable field is at the
1507 * same offset
1508 */
1509 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1510 if (baselen > len)
1511 return;
1512
1513 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1514 false, &elems);
1515
1516 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1517 }
1518
1519 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1520 struct sk_buff *skb)
1521 {
1522 struct ieee80211_rx_status *rx_status;
1523 struct ieee80211_mgmt *mgmt;
1524 u16 fc;
1525 struct ieee802_11_elems elems;
1526 int ies_len;
1527
1528 rx_status = IEEE80211_SKB_RXCB(skb);
1529 mgmt = (struct ieee80211_mgmt *) skb->data;
1530 fc = le16_to_cpu(mgmt->frame_control);
1531
1532 sdata_lock(sdata);
1533
1534 if (!sdata->u.ibss.ssid_len)
1535 goto mgmt_out; /* not ready to merge yet */
1536
1537 switch (fc & IEEE80211_FCTL_STYPE) {
1538 case IEEE80211_STYPE_PROBE_REQ:
1539 ieee80211_rx_mgmt_probe_req(sdata, skb);
1540 break;
1541 case IEEE80211_STYPE_PROBE_RESP:
1542 case IEEE80211_STYPE_BEACON:
1543 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1544 rx_status);
1545 break;
1546 case IEEE80211_STYPE_AUTH:
1547 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1548 break;
1549 case IEEE80211_STYPE_DEAUTH:
1550 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1551 break;
1552 case IEEE80211_STYPE_ACTION:
1553 switch (mgmt->u.action.category) {
1554 case WLAN_CATEGORY_SPECTRUM_MGMT:
1555 ies_len = skb->len -
1556 offsetof(struct ieee80211_mgmt,
1557 u.action.u.chan_switch.variable);
1558
1559 if (ies_len < 0)
1560 break;
1561
1562 ieee802_11_parse_elems(
1563 mgmt->u.action.u.chan_switch.variable,
1564 ies_len, true, &elems);
1565
1566 if (elems.parse_error)
1567 break;
1568
1569 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1570 rx_status, &elems);
1571 break;
1572 }
1573 }
1574
1575 mgmt_out:
1576 sdata_unlock(sdata);
1577 }
1578
1579 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1580 {
1581 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1582 struct sta_info *sta;
1583
1584 sdata_lock(sdata);
1585
1586 /*
1587 * Work could be scheduled after scan or similar
1588 * when we aren't even joined (or trying) with a
1589 * network.
1590 */
1591 if (!ifibss->ssid_len)
1592 goto out;
1593
1594 spin_lock_bh(&ifibss->incomplete_lock);
1595 while (!list_empty(&ifibss->incomplete_stations)) {
1596 sta = list_first_entry(&ifibss->incomplete_stations,
1597 struct sta_info, list);
1598 list_del(&sta->list);
1599 spin_unlock_bh(&ifibss->incomplete_lock);
1600
1601 ieee80211_ibss_finish_sta(sta);
1602 rcu_read_unlock();
1603 spin_lock_bh(&ifibss->incomplete_lock);
1604 }
1605 spin_unlock_bh(&ifibss->incomplete_lock);
1606
1607 switch (ifibss->state) {
1608 case IEEE80211_IBSS_MLME_SEARCH:
1609 ieee80211_sta_find_ibss(sdata);
1610 break;
1611 case IEEE80211_IBSS_MLME_JOINED:
1612 ieee80211_sta_merge_ibss(sdata);
1613 break;
1614 default:
1615 WARN_ON(1);
1616 break;
1617 }
1618
1619 out:
1620 sdata_unlock(sdata);
1621 }
1622
1623 static void ieee80211_ibss_timer(unsigned long data)
1624 {
1625 struct ieee80211_sub_if_data *sdata =
1626 (struct ieee80211_sub_if_data *) data;
1627
1628 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1629 }
1630
1631 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1632 {
1633 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1634
1635 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1636 (unsigned long) sdata);
1637 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1638 spin_lock_init(&ifibss->incomplete_lock);
1639 INIT_WORK(&ifibss->csa_connection_drop_work,
1640 ieee80211_csa_connection_drop_work);
1641 }
1642
1643 /* scan finished notification */
1644 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1645 {
1646 struct ieee80211_sub_if_data *sdata;
1647
1648 mutex_lock(&local->iflist_mtx);
1649 list_for_each_entry(sdata, &local->interfaces, list) {
1650 if (!ieee80211_sdata_running(sdata))
1651 continue;
1652 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1653 continue;
1654 sdata->u.ibss.last_scan_completed = jiffies;
1655 ieee80211_queue_work(&local->hw, &sdata->work);
1656 }
1657 mutex_unlock(&local->iflist_mtx);
1658 }
1659
1660 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1661 struct cfg80211_ibss_params *params)
1662 {
1663 u32 changed = 0;
1664 u32 rate_flags;
1665 struct ieee80211_supported_band *sband;
1666 int i;
1667
1668 if (params->bssid) {
1669 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1670 sdata->u.ibss.fixed_bssid = true;
1671 } else
1672 sdata->u.ibss.fixed_bssid = false;
1673
1674 sdata->u.ibss.privacy = params->privacy;
1675 sdata->u.ibss.control_port = params->control_port;
1676 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1677 sdata->u.ibss.basic_rates = params->basic_rates;
1678
1679 /* fix basic_rates if channel does not support these rates */
1680 rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1681 sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band];
1682 for (i = 0; i < sband->n_bitrates; i++) {
1683 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1684 sdata->u.ibss.basic_rates &= ~BIT(i);
1685 }
1686 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1687 sizeof(params->mcast_rate));
1688
1689 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1690
1691 sdata->u.ibss.chandef = params->chandef;
1692 sdata->u.ibss.fixed_channel = params->channel_fixed;
1693
1694 if (params->ie) {
1695 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1696 GFP_KERNEL);
1697 if (sdata->u.ibss.ie)
1698 sdata->u.ibss.ie_len = params->ie_len;
1699 }
1700
1701 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1702 sdata->u.ibss.ibss_join_req = jiffies;
1703
1704 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1705 sdata->u.ibss.ssid_len = params->ssid_len;
1706
1707 memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1708 sizeof(sdata->u.ibss.ht_capa));
1709 memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1710 sizeof(sdata->u.ibss.ht_capa_mask));
1711
1712 /*
1713 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1714 * reserved, but an HT STA shall protect HT transmissions as though
1715 * the HT Protection field were set to non-HT mixed mode.
1716 *
1717 * In an IBSS, the RIFS Mode field of the HT Operation element is
1718 * also reserved, but an HT STA shall operate as though this field
1719 * were set to 1.
1720 */
1721
1722 sdata->vif.bss_conf.ht_operation_mode |=
1723 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1724 | IEEE80211_HT_PARAM_RIFS_MODE;
1725
1726 changed |= BSS_CHANGED_HT;
1727 ieee80211_bss_info_change_notify(sdata, changed);
1728
1729 sdata->smps_mode = IEEE80211_SMPS_OFF;
1730 sdata->needed_rx_chains = sdata->local->rx_chains;
1731
1732 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1733
1734 return 0;
1735 }
1736
1737 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1738 {
1739 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1740
1741 ieee80211_ibss_disconnect(sdata);
1742 ifibss->ssid_len = 0;
1743 memset(ifibss->bssid, 0, ETH_ALEN);
1744
1745 /* remove beacon */
1746 kfree(sdata->u.ibss.ie);
1747
1748 /* on the next join, re-program HT parameters */
1749 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1750 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1751
1752 synchronize_rcu();
1753
1754 skb_queue_purge(&sdata->skb_queue);
1755
1756 del_timer_sync(&sdata->u.ibss.timer);
1757
1758 return 0;
1759 }
Linus' kernel tree