Root/
1 | /* |
2 | * IBSS mode implementation |
3 | * Copyright 2003-2008, Jouni Malinen <j@w1.fi> |
4 | * Copyright 2004, Instant802 Networks, Inc. |
5 | * Copyright 2005, Devicescape Software, Inc. |
6 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
7 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> |
8 | * Copyright 2009, Johannes Berg <johannes@sipsolutions.net> |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify |
11 | * it under the terms of the GNU General Public License version 2 as |
12 | * published by the Free Software Foundation. |
13 | */ |
14 | |
15 | #include <linux/delay.h> |
16 | #include <linux/slab.h> |
17 | #include <linux/if_ether.h> |
18 | #include <linux/skbuff.h> |
19 | #include <linux/if_arp.h> |
20 | #include <linux/etherdevice.h> |
21 | #include <linux/rtnetlink.h> |
22 | #include <net/mac80211.h> |
23 | |
24 | #include "ieee80211_i.h" |
25 | #include "driver-ops.h" |
26 | #include "rate.h" |
27 | |
28 | #define IEEE80211_SCAN_INTERVAL (2 * HZ) |
29 | #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) |
30 | |
31 | #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) |
32 | #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) |
33 | #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ) |
34 | |
35 | #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 |
36 | |
37 | static struct beacon_data * |
38 | ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata, |
39 | const int beacon_int, const u32 basic_rates, |
40 | const u16 capability, u64 tsf, |
41 | struct cfg80211_chan_def *chandef, |
42 | bool *have_higher_than_11mbit, |
43 | struct cfg80211_csa_settings *csa_settings) |
44 | { |
45 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46 | struct ieee80211_local *local = sdata->local; |
47 | int rates_n = 0, i, ri; |
48 | struct ieee80211_mgmt *mgmt; |
49 | u8 *pos; |
50 | struct ieee80211_supported_band *sband; |
51 | u32 rate_flags, rates = 0, rates_added = 0; |
52 | struct beacon_data *presp; |
53 | int frame_len; |
54 | int shift; |
55 | |
56 | /* Build IBSS probe response */ |
57 | frame_len = sizeof(struct ieee80211_hdr_3addr) + |
58 | 12 /* struct ieee80211_mgmt.u.beacon */ + |
59 | 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + |
60 | 2 + 8 /* max Supported Rates */ + |
61 | 3 /* max DS params */ + |
62 | 4 /* IBSS params */ + |
63 | 5 /* Channel Switch Announcement */ + |
64 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + |
65 | 2 + sizeof(struct ieee80211_ht_cap) + |
66 | 2 + sizeof(struct ieee80211_ht_operation) + |
67 | ifibss->ie_len; |
68 | presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL); |
69 | if (!presp) |
70 | return NULL; |
71 | |
72 | presp->head = (void *)(presp + 1); |
73 | |
74 | mgmt = (void *) presp->head; |
75 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
76 | IEEE80211_STYPE_PROBE_RESP); |
77 | eth_broadcast_addr(mgmt->da); |
78 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
79 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
80 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
81 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
82 | mgmt->u.beacon.capab_info = cpu_to_le16(capability); |
83 | |
84 | pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable); |
85 | |
86 | *pos++ = WLAN_EID_SSID; |
87 | *pos++ = ifibss->ssid_len; |
88 | memcpy(pos, ifibss->ssid, ifibss->ssid_len); |
89 | pos += ifibss->ssid_len; |
90 | |
91 | sband = local->hw.wiphy->bands[chandef->chan->band]; |
92 | rate_flags = ieee80211_chandef_rate_flags(chandef); |
93 | shift = ieee80211_chandef_get_shift(chandef); |
94 | rates_n = 0; |
95 | if (have_higher_than_11mbit) |
96 | *have_higher_than_11mbit = false; |
97 | |
98 | for (i = 0; i < sband->n_bitrates; i++) { |
99 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) |
100 | continue; |
101 | if (sband->bitrates[i].bitrate > 110 && |
102 | have_higher_than_11mbit) |
103 | *have_higher_than_11mbit = true; |
104 | |
105 | rates |= BIT(i); |
106 | rates_n++; |
107 | } |
108 | |
109 | *pos++ = WLAN_EID_SUPP_RATES; |
110 | *pos++ = min_t(int, 8, rates_n); |
111 | for (ri = 0; ri < sband->n_bitrates; ri++) { |
112 | int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, |
113 | 5 * (1 << shift)); |
114 | u8 basic = 0; |
115 | if (!(rates & BIT(ri))) |
116 | continue; |
117 | |
118 | if (basic_rates & BIT(ri)) |
119 | basic = 0x80; |
120 | *pos++ = basic | (u8) rate; |
121 | if (++rates_added == 8) { |
122 | ri++; /* continue at next rate for EXT_SUPP_RATES */ |
123 | break; |
124 | } |
125 | } |
126 | |
127 | if (sband->band == IEEE80211_BAND_2GHZ) { |
128 | *pos++ = WLAN_EID_DS_PARAMS; |
129 | *pos++ = 1; |
130 | *pos++ = ieee80211_frequency_to_channel( |
131 | chandef->chan->center_freq); |
132 | } |
133 | |
134 | *pos++ = WLAN_EID_IBSS_PARAMS; |
135 | *pos++ = 2; |
136 | /* FIX: set ATIM window based on scan results */ |
137 | *pos++ = 0; |
138 | *pos++ = 0; |
139 | |
140 | if (csa_settings) { |
141 | *pos++ = WLAN_EID_CHANNEL_SWITCH; |
142 | *pos++ = 3; |
143 | *pos++ = csa_settings->block_tx ? 1 : 0; |
144 | *pos++ = ieee80211_frequency_to_channel( |
145 | csa_settings->chandef.chan->center_freq); |
146 | sdata->csa_counter_offset_beacon = (pos - presp->head); |
147 | *pos++ = csa_settings->count; |
148 | } |
149 | |
150 | /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ |
151 | if (rates_n > 8) { |
152 | *pos++ = WLAN_EID_EXT_SUPP_RATES; |
153 | *pos++ = rates_n - 8; |
154 | for (; ri < sband->n_bitrates; ri++) { |
155 | int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, |
156 | 5 * (1 << shift)); |
157 | u8 basic = 0; |
158 | if (!(rates & BIT(ri))) |
159 | continue; |
160 | |
161 | if (basic_rates & BIT(ri)) |
162 | basic = 0x80; |
163 | *pos++ = basic | (u8) rate; |
164 | } |
165 | } |
166 | |
167 | if (ifibss->ie_len) { |
168 | memcpy(pos, ifibss->ie, ifibss->ie_len); |
169 | pos += ifibss->ie_len; |
170 | } |
171 | |
172 | /* add HT capability and information IEs */ |
173 | if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT && |
174 | chandef->width != NL80211_CHAN_WIDTH_5 && |
175 | chandef->width != NL80211_CHAN_WIDTH_10 && |
176 | sband->ht_cap.ht_supported) { |
177 | struct ieee80211_sta_ht_cap ht_cap; |
178 | |
179 | memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); |
180 | ieee80211_apply_htcap_overrides(sdata, &ht_cap); |
181 | |
182 | pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); |
183 | /* |
184 | * Note: According to 802.11n-2009 9.13.3.1, HT Protection |
185 | * field and RIFS Mode are reserved in IBSS mode, therefore |
186 | * keep them at 0 |
187 | */ |
188 | pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, |
189 | chandef, 0); |
190 | } |
191 | |
192 | if (local->hw.queues >= IEEE80211_NUM_ACS) { |
193 | *pos++ = WLAN_EID_VENDOR_SPECIFIC; |
194 | *pos++ = 7; /* len */ |
195 | *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ |
196 | *pos++ = 0x50; |
197 | *pos++ = 0xf2; |
198 | *pos++ = 2; /* WME */ |
199 | *pos++ = 0; /* WME info */ |
200 | *pos++ = 1; /* WME ver */ |
201 | *pos++ = 0; /* U-APSD no in use */ |
202 | } |
203 | |
204 | presp->head_len = pos - presp->head; |
205 | if (WARN_ON(presp->head_len > frame_len)) |
206 | goto error; |
207 | |
208 | return presp; |
209 | error: |
210 | kfree(presp); |
211 | return NULL; |
212 | } |
213 | |
214 | static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
215 | const u8 *bssid, const int beacon_int, |
216 | struct cfg80211_chan_def *req_chandef, |
217 | const u32 basic_rates, |
218 | const u16 capability, u64 tsf, |
219 | bool creator) |
220 | { |
221 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
222 | struct ieee80211_local *local = sdata->local; |
223 | struct ieee80211_mgmt *mgmt; |
224 | struct cfg80211_bss *bss; |
225 | u32 bss_change; |
226 | struct cfg80211_chan_def chandef; |
227 | struct ieee80211_channel *chan; |
228 | struct beacon_data *presp; |
229 | enum nl80211_bss_scan_width scan_width; |
230 | bool have_higher_than_11mbit; |
231 | bool radar_required = false; |
232 | int err; |
233 | |
234 | sdata_assert_lock(sdata); |
235 | |
236 | /* Reset own TSF to allow time synchronization work. */ |
237 | drv_reset_tsf(local, sdata); |
238 | |
239 | if (!ether_addr_equal(ifibss->bssid, bssid)) |
240 | sta_info_flush(sdata); |
241 | |
242 | /* if merging, indicate to driver that we leave the old IBSS */ |
243 | if (sdata->vif.bss_conf.ibss_joined) { |
244 | sdata->vif.bss_conf.ibss_joined = false; |
245 | sdata->vif.bss_conf.ibss_creator = false; |
246 | sdata->vif.bss_conf.enable_beacon = false; |
247 | netif_carrier_off(sdata->dev); |
248 | ieee80211_bss_info_change_notify(sdata, |
249 | BSS_CHANGED_IBSS | |
250 | BSS_CHANGED_BEACON_ENABLED); |
251 | drv_leave_ibss(local, sdata); |
252 | } |
253 | |
254 | presp = rcu_dereference_protected(ifibss->presp, |
255 | lockdep_is_held(&sdata->wdev.mtx)); |
256 | rcu_assign_pointer(ifibss->presp, NULL); |
257 | if (presp) |
258 | kfree_rcu(presp, rcu_head); |
259 | |
260 | sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; |
261 | |
262 | /* make a copy of the chandef, it could be modified below. */ |
263 | chandef = *req_chandef; |
264 | chan = chandef.chan; |
265 | if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) { |
266 | if (chandef.width == NL80211_CHAN_WIDTH_5 || |
267 | chandef.width == NL80211_CHAN_WIDTH_10 || |
268 | chandef.width == NL80211_CHAN_WIDTH_20_NOHT || |
269 | chandef.width == NL80211_CHAN_WIDTH_20) { |
270 | sdata_info(sdata, |
271 | "Failed to join IBSS, beacons forbidden\n"); |
272 | return; |
273 | } |
274 | chandef.width = NL80211_CHAN_WIDTH_20; |
275 | chandef.center_freq1 = chan->center_freq; |
276 | /* check again for downgraded chandef */ |
277 | if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) { |
278 | sdata_info(sdata, |
279 | "Failed to join IBSS, beacons forbidden\n"); |
280 | return; |
281 | } |
282 | } |
283 | |
284 | err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, |
285 | &chandef); |
286 | if (err < 0) { |
287 | sdata_info(sdata, |
288 | "Failed to join IBSS, invalid chandef\n"); |
289 | return; |
290 | } |
291 | if (err > 0) { |
292 | if (!ifibss->userspace_handles_dfs) { |
293 | sdata_info(sdata, |
294 | "Failed to join IBSS, DFS channel without control program\n"); |
295 | return; |
296 | } |
297 | radar_required = true; |
298 | } |
299 | |
300 | mutex_lock(&local->mtx); |
301 | if (ieee80211_vif_use_channel(sdata, &chandef, |
302 | ifibss->fixed_channel ? |
303 | IEEE80211_CHANCTX_SHARED : |
304 | IEEE80211_CHANCTX_EXCLUSIVE)) { |
305 | sdata_info(sdata, "Failed to join IBSS, no channel context\n"); |
306 | mutex_unlock(&local->mtx); |
307 | return; |
308 | } |
309 | sdata->radar_required = radar_required; |
310 | mutex_unlock(&local->mtx); |
311 | |
312 | memcpy(ifibss->bssid, bssid, ETH_ALEN); |
313 | |
314 | presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates, |
315 | capability, tsf, &chandef, |
316 | &have_higher_than_11mbit, NULL); |
317 | if (!presp) |
318 | return; |
319 | |
320 | rcu_assign_pointer(ifibss->presp, presp); |
321 | mgmt = (void *)presp->head; |
322 | |
323 | sdata->vif.bss_conf.enable_beacon = true; |
324 | sdata->vif.bss_conf.beacon_int = beacon_int; |
325 | sdata->vif.bss_conf.basic_rates = basic_rates; |
326 | sdata->vif.bss_conf.ssid_len = ifibss->ssid_len; |
327 | memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len); |
328 | bss_change = BSS_CHANGED_BEACON_INT; |
329 | bss_change |= ieee80211_reset_erp_info(sdata); |
330 | bss_change |= BSS_CHANGED_BSSID; |
331 | bss_change |= BSS_CHANGED_BEACON; |
332 | bss_change |= BSS_CHANGED_BEACON_ENABLED; |
333 | bss_change |= BSS_CHANGED_BASIC_RATES; |
334 | bss_change |= BSS_CHANGED_HT; |
335 | bss_change |= BSS_CHANGED_IBSS; |
336 | bss_change |= BSS_CHANGED_SSID; |
337 | |
338 | /* |
339 | * In 5 GHz/802.11a, we can always use short slot time. |
340 | * (IEEE 802.11-2012 18.3.8.7) |
341 | * |
342 | * In 2.4GHz, we must always use long slots in IBSS for compatibility |
343 | * reasons. |
344 | * (IEEE 802.11-2012 19.4.5) |
345 | * |
346 | * HT follows these specifications (IEEE 802.11-2012 20.3.18) |
347 | */ |
348 | sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ; |
349 | bss_change |= BSS_CHANGED_ERP_SLOT; |
350 | |
351 | /* cf. IEEE 802.11 9.2.12 */ |
352 | if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit) |
353 | sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; |
354 | else |
355 | sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; |
356 | |
357 | ieee80211_set_wmm_default(sdata, true); |
358 | |
359 | sdata->vif.bss_conf.ibss_joined = true; |
360 | sdata->vif.bss_conf.ibss_creator = creator; |
361 | |
362 | err = drv_join_ibss(local, sdata); |
363 | if (err) { |
364 | sdata->vif.bss_conf.ibss_joined = false; |
365 | sdata->vif.bss_conf.ibss_creator = false; |
366 | sdata->vif.bss_conf.enable_beacon = false; |
367 | sdata->vif.bss_conf.ssid_len = 0; |
368 | RCU_INIT_POINTER(ifibss->presp, NULL); |
369 | kfree_rcu(presp, rcu_head); |
370 | mutex_lock(&local->mtx); |
371 | ieee80211_vif_release_channel(sdata); |
372 | mutex_unlock(&local->mtx); |
373 | sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n", |
374 | err); |
375 | return; |
376 | } |
377 | |
378 | ieee80211_bss_info_change_notify(sdata, bss_change); |
379 | |
380 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
381 | mod_timer(&ifibss->timer, |
382 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); |
383 | |
384 | scan_width = cfg80211_chandef_to_scan_width(&chandef); |
385 | bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan, |
386 | scan_width, mgmt, |
387 | presp->head_len, 0, GFP_KERNEL); |
388 | cfg80211_put_bss(local->hw.wiphy, bss); |
389 | netif_carrier_on(sdata->dev); |
390 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL); |
391 | } |
392 | |
393 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
394 | struct ieee80211_bss *bss) |
395 | { |
396 | struct cfg80211_bss *cbss = |
397 | container_of((void *)bss, struct cfg80211_bss, priv); |
398 | struct ieee80211_supported_band *sband; |
399 | struct cfg80211_chan_def chandef; |
400 | u32 basic_rates; |
401 | int i, j; |
402 | u16 beacon_int = cbss->beacon_interval; |
403 | const struct cfg80211_bss_ies *ies; |
404 | enum nl80211_channel_type chan_type; |
405 | u64 tsf; |
406 | u32 rate_flags; |
407 | int shift; |
408 | |
409 | sdata_assert_lock(sdata); |
410 | |
411 | if (beacon_int < 10) |
412 | beacon_int = 10; |
413 | |
414 | switch (sdata->u.ibss.chandef.width) { |
415 | case NL80211_CHAN_WIDTH_20_NOHT: |
416 | case NL80211_CHAN_WIDTH_20: |
417 | case NL80211_CHAN_WIDTH_40: |
418 | chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); |
419 | cfg80211_chandef_create(&chandef, cbss->channel, chan_type); |
420 | break; |
421 | case NL80211_CHAN_WIDTH_5: |
422 | case NL80211_CHAN_WIDTH_10: |
423 | cfg80211_chandef_create(&chandef, cbss->channel, |
424 | NL80211_CHAN_WIDTH_20_NOHT); |
425 | chandef.width = sdata->u.ibss.chandef.width; |
426 | break; |
427 | default: |
428 | /* fall back to 20 MHz for unsupported modes */ |
429 | cfg80211_chandef_create(&chandef, cbss->channel, |
430 | NL80211_CHAN_WIDTH_20_NOHT); |
431 | break; |
432 | } |
433 | |
434 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
435 | rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); |
436 | shift = ieee80211_vif_get_shift(&sdata->vif); |
437 | |
438 | basic_rates = 0; |
439 | |
440 | for (i = 0; i < bss->supp_rates_len; i++) { |
441 | int rate = bss->supp_rates[i] & 0x7f; |
442 | bool is_basic = !!(bss->supp_rates[i] & 0x80); |
443 | |
444 | for (j = 0; j < sband->n_bitrates; j++) { |
445 | int brate; |
446 | if ((rate_flags & sband->bitrates[j].flags) |
447 | != rate_flags) |
448 | continue; |
449 | |
450 | brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, |
451 | 5 * (1 << shift)); |
452 | if (brate == rate) { |
453 | if (is_basic) |
454 | basic_rates |= BIT(j); |
455 | break; |
456 | } |
457 | } |
458 | } |
459 | |
460 | rcu_read_lock(); |
461 | ies = rcu_dereference(cbss->ies); |
462 | tsf = ies->tsf; |
463 | rcu_read_unlock(); |
464 | |
465 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
466 | beacon_int, |
467 | &chandef, |
468 | basic_rates, |
469 | cbss->capability, |
470 | tsf, false); |
471 | } |
472 | |
473 | int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata, |
474 | struct cfg80211_csa_settings *csa_settings) |
475 | { |
476 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
477 | struct beacon_data *presp, *old_presp; |
478 | struct cfg80211_bss *cbss; |
479 | const struct cfg80211_bss_ies *ies; |
480 | u16 capability; |
481 | u64 tsf; |
482 | int ret = 0; |
483 | |
484 | sdata_assert_lock(sdata); |
485 | |
486 | capability = WLAN_CAPABILITY_IBSS; |
487 | |
488 | if (ifibss->privacy) |
489 | capability |= WLAN_CAPABILITY_PRIVACY; |
490 | |
491 | cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, |
492 | ifibss->bssid, ifibss->ssid, |
493 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | |
494 | WLAN_CAPABILITY_PRIVACY, |
495 | capability); |
496 | |
497 | if (WARN_ON(!cbss)) { |
498 | ret = -EINVAL; |
499 | goto out; |
500 | } |
501 | |
502 | rcu_read_lock(); |
503 | ies = rcu_dereference(cbss->ies); |
504 | tsf = ies->tsf; |
505 | rcu_read_unlock(); |
506 | cfg80211_put_bss(sdata->local->hw.wiphy, cbss); |
507 | |
508 | old_presp = rcu_dereference_protected(ifibss->presp, |
509 | lockdep_is_held(&sdata->wdev.mtx)); |
510 | |
511 | presp = ieee80211_ibss_build_presp(sdata, |
512 | sdata->vif.bss_conf.beacon_int, |
513 | sdata->vif.bss_conf.basic_rates, |
514 | capability, tsf, &ifibss->chandef, |
515 | NULL, csa_settings); |
516 | if (!presp) { |
517 | ret = -ENOMEM; |
518 | goto out; |
519 | } |
520 | |
521 | rcu_assign_pointer(ifibss->presp, presp); |
522 | if (old_presp) |
523 | kfree_rcu(old_presp, rcu_head); |
524 | |
525 | return BSS_CHANGED_BEACON; |
526 | out: |
527 | return ret; |
528 | } |
529 | |
530 | int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata) |
531 | { |
532 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
533 | struct cfg80211_bss *cbss; |
534 | int err, changed = 0; |
535 | u16 capability; |
536 | |
537 | sdata_assert_lock(sdata); |
538 | |
539 | /* update cfg80211 bss information with the new channel */ |
540 | if (!is_zero_ether_addr(ifibss->bssid)) { |
541 | capability = WLAN_CAPABILITY_IBSS; |
542 | |
543 | if (ifibss->privacy) |
544 | capability |= WLAN_CAPABILITY_PRIVACY; |
545 | |
546 | cbss = cfg80211_get_bss(sdata->local->hw.wiphy, |
547 | ifibss->chandef.chan, |
548 | ifibss->bssid, ifibss->ssid, |
549 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | |
550 | WLAN_CAPABILITY_PRIVACY, |
551 | capability); |
552 | /* XXX: should not really modify cfg80211 data */ |
553 | if (cbss) { |
554 | cbss->channel = sdata->csa_chandef.chan; |
555 | cfg80211_put_bss(sdata->local->hw.wiphy, cbss); |
556 | } |
557 | } |
558 | |
559 | ifibss->chandef = sdata->csa_chandef; |
560 | |
561 | /* generate the beacon */ |
562 | err = ieee80211_ibss_csa_beacon(sdata, NULL); |
563 | if (err < 0) |
564 | return err; |
565 | |
566 | changed |= err; |
567 | |
568 | return changed; |
569 | } |
570 | |
571 | void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata) |
572 | { |
573 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
574 | |
575 | cancel_work_sync(&ifibss->csa_connection_drop_work); |
576 | } |
577 | |
578 | static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) |
579 | __acquires(RCU) |
580 | { |
581 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
582 | u8 addr[ETH_ALEN]; |
583 | |
584 | memcpy(addr, sta->sta.addr, ETH_ALEN); |
585 | |
586 | ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); |
587 | |
588 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
589 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); |
590 | /* authorize the station only if the network is not RSN protected. If |
591 | * not wait for the userspace to authorize it */ |
592 | if (!sta->sdata->u.ibss.control_port) |
593 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); |
594 | |
595 | rate_control_rate_init(sta); |
596 | |
597 | /* If it fails, maybe we raced another insertion? */ |
598 | if (sta_info_insert_rcu(sta)) |
599 | return sta_info_get(sdata, addr); |
600 | return sta; |
601 | } |
602 | |
603 | static struct sta_info * |
604 | ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, |
605 | const u8 *addr, u32 supp_rates) |
606 | __acquires(RCU) |
607 | { |
608 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
609 | struct ieee80211_local *local = sdata->local; |
610 | struct sta_info *sta; |
611 | struct ieee80211_chanctx_conf *chanctx_conf; |
612 | struct ieee80211_supported_band *sband; |
613 | enum nl80211_bss_scan_width scan_width; |
614 | int band; |
615 | |
616 | /* |
617 | * XXX: Consider removing the least recently used entry and |
618 | * allow new one to be added. |
619 | */ |
620 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
621 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
622 | sdata->name, addr); |
623 | rcu_read_lock(); |
624 | return NULL; |
625 | } |
626 | |
627 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { |
628 | rcu_read_lock(); |
629 | return NULL; |
630 | } |
631 | |
632 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { |
633 | rcu_read_lock(); |
634 | return NULL; |
635 | } |
636 | |
637 | rcu_read_lock(); |
638 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); |
639 | if (WARN_ON_ONCE(!chanctx_conf)) |
640 | return NULL; |
641 | band = chanctx_conf->def.chan->band; |
642 | scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); |
643 | rcu_read_unlock(); |
644 | |
645 | sta = sta_info_alloc(sdata, addr, GFP_KERNEL); |
646 | if (!sta) { |
647 | rcu_read_lock(); |
648 | return NULL; |
649 | } |
650 | |
651 | sta->last_rx = jiffies; |
652 | |
653 | /* make sure mandatory rates are always added */ |
654 | sband = local->hw.wiphy->bands[band]; |
655 | sta->sta.supp_rates[band] = supp_rates | |
656 | ieee80211_mandatory_rates(sband, scan_width); |
657 | |
658 | return ieee80211_ibss_finish_sta(sta); |
659 | } |
660 | |
661 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) |
662 | { |
663 | struct ieee80211_local *local = sdata->local; |
664 | int active = 0; |
665 | struct sta_info *sta; |
666 | |
667 | sdata_assert_lock(sdata); |
668 | |
669 | rcu_read_lock(); |
670 | |
671 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
672 | if (sta->sdata == sdata && |
673 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, |
674 | jiffies)) { |
675 | active++; |
676 | break; |
677 | } |
678 | } |
679 | |
680 | rcu_read_unlock(); |
681 | |
682 | return active; |
683 | } |
684 | |
685 | static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) |
686 | { |
687 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
688 | struct ieee80211_local *local = sdata->local; |
689 | struct cfg80211_bss *cbss; |
690 | struct beacon_data *presp; |
691 | struct sta_info *sta; |
692 | u16 capability; |
693 | |
694 | if (!is_zero_ether_addr(ifibss->bssid)) { |
695 | capability = WLAN_CAPABILITY_IBSS; |
696 | |
697 | if (ifibss->privacy) |
698 | capability |= WLAN_CAPABILITY_PRIVACY; |
699 | |
700 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, |
701 | ifibss->bssid, ifibss->ssid, |
702 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | |
703 | WLAN_CAPABILITY_PRIVACY, |
704 | capability); |
705 | |
706 | if (cbss) { |
707 | cfg80211_unlink_bss(local->hw.wiphy, cbss); |
708 | cfg80211_put_bss(sdata->local->hw.wiphy, cbss); |
709 | } |
710 | } |
711 | |
712 | ifibss->state = IEEE80211_IBSS_MLME_SEARCH; |
713 | |
714 | sta_info_flush(sdata); |
715 | |
716 | spin_lock_bh(&ifibss->incomplete_lock); |
717 | while (!list_empty(&ifibss->incomplete_stations)) { |
718 | sta = list_first_entry(&ifibss->incomplete_stations, |
719 | struct sta_info, list); |
720 | list_del(&sta->list); |
721 | spin_unlock_bh(&ifibss->incomplete_lock); |
722 | |
723 | sta_info_free(local, sta); |
724 | spin_lock_bh(&ifibss->incomplete_lock); |
725 | } |
726 | spin_unlock_bh(&ifibss->incomplete_lock); |
727 | |
728 | netif_carrier_off(sdata->dev); |
729 | |
730 | sdata->vif.bss_conf.ibss_joined = false; |
731 | sdata->vif.bss_conf.ibss_creator = false; |
732 | sdata->vif.bss_conf.enable_beacon = false; |
733 | sdata->vif.bss_conf.ssid_len = 0; |
734 | |
735 | /* remove beacon */ |
736 | presp = rcu_dereference_protected(ifibss->presp, |
737 | lockdep_is_held(&sdata->wdev.mtx)); |
738 | RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); |
739 | if (presp) |
740 | kfree_rcu(presp, rcu_head); |
741 | |
742 | clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); |
743 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | |
744 | BSS_CHANGED_IBSS); |
745 | drv_leave_ibss(local, sdata); |
746 | mutex_lock(&local->mtx); |
747 | ieee80211_vif_release_channel(sdata); |
748 | mutex_unlock(&local->mtx); |
749 | } |
750 | |
751 | static void ieee80211_csa_connection_drop_work(struct work_struct *work) |
752 | { |
753 | struct ieee80211_sub_if_data *sdata = |
754 | container_of(work, struct ieee80211_sub_if_data, |
755 | u.ibss.csa_connection_drop_work); |
756 | |
757 | sdata_lock(sdata); |
758 | |
759 | ieee80211_ibss_disconnect(sdata); |
760 | synchronize_rcu(); |
761 | skb_queue_purge(&sdata->skb_queue); |
762 | |
763 | /* trigger a scan to find another IBSS network to join */ |
764 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
765 | |
766 | sdata_unlock(sdata); |
767 | } |
768 | |
769 | static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) |
770 | { |
771 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
772 | int err; |
773 | |
774 | /* if the current channel is a DFS channel, mark the channel as |
775 | * unavailable. |
776 | */ |
777 | err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, |
778 | &ifibss->chandef); |
779 | if (err > 0) |
780 | cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, |
781 | GFP_ATOMIC); |
782 | } |
783 | |
784 | static bool |
785 | ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, |
786 | struct ieee802_11_elems *elems, |
787 | bool beacon) |
788 | { |
789 | struct cfg80211_csa_settings params; |
790 | struct ieee80211_csa_ie csa_ie; |
791 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
792 | enum nl80211_channel_type ch_type; |
793 | int err; |
794 | u32 sta_flags; |
795 | |
796 | sdata_assert_lock(sdata); |
797 | |
798 | sta_flags = IEEE80211_STA_DISABLE_VHT; |
799 | switch (ifibss->chandef.width) { |
800 | case NL80211_CHAN_WIDTH_5: |
801 | case NL80211_CHAN_WIDTH_10: |
802 | case NL80211_CHAN_WIDTH_20_NOHT: |
803 | sta_flags |= IEEE80211_STA_DISABLE_HT; |
804 | /* fall through */ |
805 | case NL80211_CHAN_WIDTH_20: |
806 | sta_flags |= IEEE80211_STA_DISABLE_40MHZ; |
807 | break; |
808 | default: |
809 | break; |
810 | } |
811 | |
812 | memset(¶ms, 0, sizeof(params)); |
813 | memset(&csa_ie, 0, sizeof(csa_ie)); |
814 | err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, |
815 | ifibss->chandef.chan->band, |
816 | sta_flags, ifibss->bssid, &csa_ie); |
817 | /* can't switch to destination channel, fail */ |
818 | if (err < 0) |
819 | goto disconnect; |
820 | |
821 | /* did not contain a CSA */ |
822 | if (err) |
823 | return false; |
824 | |
825 | /* channel switch is not supported, disconnect */ |
826 | if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) |
827 | goto disconnect; |
828 | |
829 | params.count = csa_ie.count; |
830 | params.chandef = csa_ie.chandef; |
831 | |
832 | switch (ifibss->chandef.width) { |
833 | case NL80211_CHAN_WIDTH_20_NOHT: |
834 | case NL80211_CHAN_WIDTH_20: |
835 | case NL80211_CHAN_WIDTH_40: |
836 | /* keep our current HT mode (HT20/HT40+/HT40-), even if |
837 | * another mode has been announced. The mode is not adopted |
838 | * within the beacon while doing CSA and we should therefore |
839 | * keep the mode which we announce. |
840 | */ |
841 | ch_type = cfg80211_get_chandef_type(&ifibss->chandef); |
842 | cfg80211_chandef_create(¶ms.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, ¶ms.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 | ¶ms.chandef); |
877 | if (err < 0) |
878 | goto disconnect; |
879 | if (err) { |
880 | /* IBSS-DFS only allowed with a control program */ |
881 | if (!ifibss->userspace_handles_dfs) |
882 | goto disconnect; |
883 | |
884 | params.radar_required = true; |
885 | } |
886 | |
887 | if (cfg80211_chandef_identical(¶ms.chandef, |
888 | &sdata->vif.bss_conf.chandef)) { |
889 | ibss_dbg(sdata, |
890 | "received csa with an identical chandef, ignoring\n"); |
891 | return true; |
892 | } |
893 | |
894 | /* all checks done, now perform the channel switch. */ |
895 | ibss_dbg(sdata, |
896 | "received channel switch announcement to go to channel %d MHz\n", |
897 | params.chandef.chan->center_freq); |
898 | |
899 | params.block_tx = !!csa_ie.mode; |
900 | |
901 | if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, |
902 | ¶ms)) |
903 | goto disconnect; |
904 | |
905 | ieee80211_ibss_csa_mark_radar(sdata); |
906 | |
907 | return true; |
908 | disconnect: |
909 | ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); |
910 | ieee80211_queue_work(&sdata->local->hw, |
911 | &ifibss->csa_connection_drop_work); |
912 | |
913 | ieee80211_ibss_csa_mark_radar(sdata); |
914 | |
915 | return true; |
916 | } |
917 | |
918 | static void |
919 | ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, |
920 | struct ieee80211_mgmt *mgmt, size_t len, |
921 | struct ieee80211_rx_status *rx_status, |
922 | struct ieee802_11_elems *elems) |
923 | { |
924 | int required_len; |
925 | |
926 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) |
927 | return; |
928 | |
929 | /* CSA is the only action we handle for now */ |
930 | if (mgmt->u.action.u.measurement.action_code != |
931 | WLAN_ACTION_SPCT_CHL_SWITCH) |
932 | return; |
933 | |
934 | required_len = IEEE80211_MIN_ACTION_SIZE + |
935 | sizeof(mgmt->u.action.u.chan_switch); |
936 | if (len < required_len) |
937 | return; |
938 | |
939 | if (!sdata->vif.csa_active) |
940 | ieee80211_ibss_process_chanswitch(sdata, elems, false); |
941 | } |
942 | |
943 | static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, |
944 | struct ieee80211_mgmt *mgmt, |
945 | size_t len) |
946 | { |
947 | u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); |
948 | |
949 | if (len < IEEE80211_DEAUTH_FRAME_LEN) |
950 | return; |
951 | |
952 | ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", |
953 | mgmt->sa, mgmt->da, mgmt->bssid, reason); |
954 | sta_info_destroy_addr(sdata, mgmt->sa); |
955 | } |
956 | |
957 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, |
958 | struct ieee80211_mgmt *mgmt, |
959 | size_t len) |
960 | { |
961 | u16 auth_alg, auth_transaction; |
962 | |
963 | sdata_assert_lock(sdata); |
964 | |
965 | if (len < 24 + 6) |
966 | return; |
967 | |
968 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); |
969 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); |
970 | |
971 | ibss_dbg(sdata, |
972 | "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", |
973 | mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); |
974 | |
975 | if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) |
976 | return; |
977 | |
978 | /* |
979 | * IEEE 802.11 standard does not require authentication in IBSS |
980 | * networks and most implementations do not seem to use it. |
981 | * However, try to reply to authentication attempts if someone |
982 | * has actually implemented this. |
983 | */ |
984 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, |
985 | mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); |
986 | } |
987 | |
988 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
989 | struct ieee80211_mgmt *mgmt, size_t len, |
990 | struct ieee80211_rx_status *rx_status, |
991 | struct ieee802_11_elems *elems) |
992 | { |
993 | struct ieee80211_local *local = sdata->local; |
994 | struct cfg80211_bss *cbss; |
995 | struct ieee80211_bss *bss; |
996 | struct sta_info *sta; |
997 | struct ieee80211_channel *channel; |
998 | u64 beacon_timestamp, rx_timestamp; |
999 | u32 supp_rates = 0; |
1000 | enum ieee80211_band band = rx_status->band; |
1001 | enum nl80211_bss_scan_width scan_width; |
1002 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; |
1003 | bool rates_updated = false; |
1004 | |
1005 | channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); |
1006 | if (!channel) |
1007 | return; |
1008 | |
1009 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && |
1010 | ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) { |
1011 | |
1012 | rcu_read_lock(); |
1013 | sta = sta_info_get(sdata, mgmt->sa); |
1014 | |
1015 | if (elems->supp_rates) { |
1016 | supp_rates = ieee80211_sta_get_rates(sdata, elems, |
1017 | band, NULL); |
1018 | if (sta) { |
1019 | u32 prev_rates; |
1020 | |
1021 | prev_rates = sta->sta.supp_rates[band]; |
1022 | /* make sure mandatory rates are always added */ |
1023 | scan_width = NL80211_BSS_CHAN_WIDTH_20; |
1024 | if (rx_status->flag & RX_FLAG_5MHZ) |
1025 | scan_width = NL80211_BSS_CHAN_WIDTH_5; |
1026 | if (rx_status->flag & RX_FLAG_10MHZ) |
1027 | scan_width = NL80211_BSS_CHAN_WIDTH_10; |
1028 | |
1029 | sta->sta.supp_rates[band] = supp_rates | |
1030 | ieee80211_mandatory_rates(sband, |
1031 | scan_width); |
1032 | if (sta->sta.supp_rates[band] != prev_rates) { |
1033 | ibss_dbg(sdata, |
1034 | "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", |
1035 | sta->sta.addr, prev_rates, |
1036 | sta->sta.supp_rates[band]); |
1037 | rates_updated = true; |
1038 | } |
1039 | } else { |
1040 | rcu_read_unlock(); |
1041 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, |
1042 | mgmt->sa, supp_rates); |
1043 | } |
1044 | } |
1045 | |
1046 | if (sta && elems->wmm_info) |
1047 | set_sta_flag(sta, WLAN_STA_WME); |
1048 | |
1049 | if (sta && elems->ht_operation && elems->ht_cap_elem && |
1050 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && |
1051 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && |
1052 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { |
1053 | /* we both use HT */ |
1054 | struct ieee80211_ht_cap htcap_ie; |
1055 | struct cfg80211_chan_def chandef; |
1056 | |
1057 | ieee80211_ht_oper_to_chandef(channel, |
1058 | elems->ht_operation, |
1059 | &chandef); |
1060 | |
1061 | memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); |
1062 | |
1063 | /* |
1064 | * fall back to HT20 if we don't use or use |
1065 | * the other extension channel |
1066 | */ |
1067 | if (chandef.center_freq1 != |
1068 | sdata->u.ibss.chandef.center_freq1) |
1069 | htcap_ie.cap_info &= |
1070 | cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40); |
1071 | |
1072 | rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap( |
1073 | sdata, sband, &htcap_ie, sta); |
1074 | } |
1075 | |
1076 | if (sta && rates_updated) { |
1077 | drv_sta_rc_update(local, sdata, &sta->sta, |
1078 | IEEE80211_RC_SUPP_RATES_CHANGED); |
1079 | rate_control_rate_init(sta); |
1080 | } |
1081 | |
1082 | rcu_read_unlock(); |
1083 | } |
1084 | |
1085 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, |
1086 | channel); |
1087 | if (!bss) |
1088 | return; |
1089 | |
1090 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
1091 | |
1092 | /* same for beacon and probe response */ |
1093 | beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); |
1094 | |
1095 | /* check if we need to merge IBSS */ |
1096 | |
1097 | /* not an IBSS */ |
1098 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
1099 | goto put_bss; |
1100 | |
1101 | /* different channel */ |
1102 | if (sdata->u.ibss.fixed_channel && |
1103 | sdata->u.ibss.chandef.chan != cbss->channel) |
1104 | goto put_bss; |
1105 | |
1106 | /* different SSID */ |
1107 | if (elems->ssid_len != sdata->u.ibss.ssid_len || |
1108 | memcmp(elems->ssid, sdata->u.ibss.ssid, |
1109 | sdata->u.ibss.ssid_len)) |
1110 | goto put_bss; |
1111 | |
1112 | /* process channel switch */ |
1113 | if (sdata->vif.csa_active || |
1114 | ieee80211_ibss_process_chanswitch(sdata, elems, true)) |
1115 | goto put_bss; |
1116 | |
1117 | /* same BSSID */ |
1118 | if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) |
1119 | goto put_bss; |
1120 | |
1121 | /* we use a fixed BSSID */ |
1122 | if (sdata->u.ibss.fixed_bssid) |
1123 | goto put_bss; |
1124 | |
1125 | if (ieee80211_have_rx_timestamp(rx_status)) { |
1126 | /* time when timestamp field was received */ |
1127 | rx_timestamp = |
1128 | ieee80211_calculate_rx_timestamp(local, rx_status, |
1129 | len + FCS_LEN, 24); |
1130 | } else { |
1131 | /* |
1132 | * second best option: get current TSF |
1133 | * (will return -1 if not supported) |
1134 | */ |
1135 | rx_timestamp = drv_get_tsf(local, sdata); |
1136 | } |
1137 | |
1138 | ibss_dbg(sdata, |
1139 | "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", |
1140 | mgmt->sa, mgmt->bssid, |
1141 | (unsigned long long)rx_timestamp, |
1142 | (unsigned long long)beacon_timestamp, |
1143 | (unsigned long long)(rx_timestamp - beacon_timestamp), |
1144 | jiffies); |
1145 | |
1146 | if (beacon_timestamp > rx_timestamp) { |
1147 | ibss_dbg(sdata, |
1148 | "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", |
1149 | mgmt->bssid); |
1150 | ieee80211_sta_join_ibss(sdata, bss); |
1151 | supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); |
1152 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
1153 | supp_rates); |
1154 | rcu_read_unlock(); |
1155 | } |
1156 | |
1157 | put_bss: |
1158 | ieee80211_rx_bss_put(local, bss); |
1159 | } |
1160 | |
1161 | void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
1162 | const u8 *bssid, const u8 *addr, |
1163 | u32 supp_rates) |
1164 | { |
1165 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1166 | struct ieee80211_local *local = sdata->local; |
1167 | struct sta_info *sta; |
1168 | struct ieee80211_chanctx_conf *chanctx_conf; |
1169 | struct ieee80211_supported_band *sband; |
1170 | enum nl80211_bss_scan_width scan_width; |
1171 | int band; |
1172 | |
1173 | /* |
1174 | * XXX: Consider removing the least recently used entry and |
1175 | * allow new one to be added. |
1176 | */ |
1177 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
1178 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
1179 | sdata->name, addr); |
1180 | return; |
1181 | } |
1182 | |
1183 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
1184 | return; |
1185 | |
1186 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) |
1187 | return; |
1188 | |
1189 | rcu_read_lock(); |
1190 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); |
1191 | if (WARN_ON_ONCE(!chanctx_conf)) { |
1192 | rcu_read_unlock(); |
1193 | return; |
1194 | } |
1195 | band = chanctx_conf->def.chan->band; |
1196 | scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); |
1197 | rcu_read_unlock(); |
1198 | |
1199 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
1200 | if (!sta) |
1201 | return; |
1202 | |
1203 | sta->last_rx = jiffies; |
1204 | |
1205 | /* make sure mandatory rates are always added */ |
1206 | sband = local->hw.wiphy->bands[band]; |
1207 | sta->sta.supp_rates[band] = supp_rates | |
1208 | ieee80211_mandatory_rates(sband, scan_width); |
1209 | |
1210 | spin_lock(&ifibss->incomplete_lock); |
1211 | list_add(&sta->list, &ifibss->incomplete_stations); |
1212 | spin_unlock(&ifibss->incomplete_lock); |
1213 | ieee80211_queue_work(&local->hw, &sdata->work); |
1214 | } |
1215 | |
1216 | static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) |
1217 | { |
1218 | struct ieee80211_local *local = sdata->local; |
1219 | struct sta_info *sta, *tmp; |
1220 | unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; |
1221 | unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; |
1222 | |
1223 | mutex_lock(&local->sta_mtx); |
1224 | |
1225 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { |
1226 | if (sdata != sta->sdata) |
1227 | continue; |
1228 | |
1229 | if (time_after(jiffies, sta->last_rx + exp_time) || |
1230 | (time_after(jiffies, sta->last_rx + exp_rsn_time) && |
1231 | sta->sta_state != IEEE80211_STA_AUTHORIZED)) { |
1232 | sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", |
1233 | sta->sta_state != IEEE80211_STA_AUTHORIZED ? |
1234 | "not authorized " : "", sta->sta.addr); |
1235 | |
1236 | WARN_ON(__sta_info_destroy(sta)); |
1237 | } |
1238 | } |
1239 | |
1240 | mutex_unlock(&local->sta_mtx); |
1241 | } |
1242 | |
1243 | /* |
1244 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED |
1245 | */ |
1246 | |
1247 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) |
1248 | { |
1249 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1250 | enum nl80211_bss_scan_width scan_width; |
1251 | |
1252 | sdata_assert_lock(sdata); |
1253 | |
1254 | mod_timer(&ifibss->timer, |
1255 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); |
1256 | |
1257 | ieee80211_ibss_sta_expire(sdata); |
1258 | |
1259 | if (time_before(jiffies, ifibss->last_scan_completed + |
1260 | IEEE80211_IBSS_MERGE_INTERVAL)) |
1261 | return; |
1262 | |
1263 | if (ieee80211_sta_active_ibss(sdata)) |
1264 | return; |
1265 | |
1266 | if (ifibss->fixed_channel) |
1267 | return; |
1268 | |
1269 | sdata_info(sdata, |
1270 | "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); |
1271 | |
1272 | scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); |
1273 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, |
1274 | NULL, scan_width); |
1275 | } |
1276 | |
1277 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
1278 | { |
1279 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1280 | u8 bssid[ETH_ALEN]; |
1281 | u16 capability; |
1282 | int i; |
1283 | |
1284 | sdata_assert_lock(sdata); |
1285 | |
1286 | if (ifibss->fixed_bssid) { |
1287 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
1288 | } else { |
1289 | /* Generate random, not broadcast, locally administered BSSID. Mix in |
1290 | * own MAC address to make sure that devices that do not have proper |
1291 | * random number generator get different BSSID. */ |
1292 | get_random_bytes(bssid, ETH_ALEN); |
1293 | for (i = 0; i < ETH_ALEN; i++) |
1294 | bssid[i] ^= sdata->vif.addr[i]; |
1295 | bssid[0] &= ~0x01; |
1296 | bssid[0] |= 0x02; |
1297 | } |
1298 | |
1299 | sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); |
1300 | |
1301 | capability = WLAN_CAPABILITY_IBSS; |
1302 | |
1303 | if (ifibss->privacy) |
1304 | capability |= WLAN_CAPABILITY_PRIVACY; |
1305 | else |
1306 | sdata->drop_unencrypted = 0; |
1307 | |
1308 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
1309 | &ifibss->chandef, ifibss->basic_rates, |
1310 | capability, 0, true); |
1311 | } |
1312 | |
1313 | /* |
1314 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH |
1315 | */ |
1316 | |
1317 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
1318 | { |
1319 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1320 | struct ieee80211_local *local = sdata->local; |
1321 | struct cfg80211_bss *cbss; |
1322 | struct ieee80211_channel *chan = NULL; |
1323 | const u8 *bssid = NULL; |
1324 | enum nl80211_bss_scan_width scan_width; |
1325 | int active_ibss; |
1326 | u16 capability; |
1327 | |
1328 | sdata_assert_lock(sdata); |
1329 | |
1330 | active_ibss = ieee80211_sta_active_ibss(sdata); |
1331 | ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); |
1332 | |
1333 | if (active_ibss) |
1334 | return; |
1335 | |
1336 | capability = WLAN_CAPABILITY_IBSS; |
1337 | if (ifibss->privacy) |
1338 | capability |= WLAN_CAPABILITY_PRIVACY; |
1339 | if (ifibss->fixed_bssid) |
1340 | bssid = ifibss->bssid; |
1341 | if (ifibss->fixed_channel) |
1342 | chan = ifibss->chandef.chan; |
1343 | if (!is_zero_ether_addr(ifibss->bssid)) |
1344 | bssid = ifibss->bssid; |
1345 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
1346 | ifibss->ssid, ifibss->ssid_len, |
1347 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, |
1348 | capability); |
1349 | |
1350 | if (cbss) { |
1351 | struct ieee80211_bss *bss; |
1352 | |
1353 | bss = (void *)cbss->priv; |
1354 | ibss_dbg(sdata, |
1355 | "sta_find_ibss: selected %pM current %pM\n", |
1356 | cbss->bssid, ifibss->bssid); |
1357 | sdata_info(sdata, |
1358 | "Selected IBSS BSSID %pM based on configured SSID\n", |
1359 | cbss->bssid); |
1360 | |
1361 | ieee80211_sta_join_ibss(sdata, bss); |
1362 | ieee80211_rx_bss_put(local, bss); |
1363 | return; |
1364 | } |
1365 | |
1366 | /* if a fixed bssid and a fixed freq have been provided create the IBSS |
1367 | * directly and do not waste time scanning |
1368 | */ |
1369 | if (ifibss->fixed_bssid && ifibss->fixed_channel) { |
1370 | sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", |
1371 | bssid); |
1372 | ieee80211_sta_create_ibss(sdata); |
1373 | return; |
1374 | } |
1375 | |
1376 | |
1377 | ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); |
1378 | |
1379 | /* Selected IBSS not found in current scan results - try to scan */ |
1380 | if (time_after(jiffies, ifibss->last_scan_completed + |
1381 | IEEE80211_SCAN_INTERVAL)) { |
1382 | sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); |
1383 | |
1384 | scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); |
1385 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, |
1386 | ifibss->ssid_len, chan, |
1387 | scan_width); |
1388 | } else { |
1389 | int interval = IEEE80211_SCAN_INTERVAL; |
1390 | |
1391 | if (time_after(jiffies, ifibss->ibss_join_req + |
1392 | IEEE80211_IBSS_JOIN_TIMEOUT)) |
1393 | ieee80211_sta_create_ibss(sdata); |
1394 | |
1395 | mod_timer(&ifibss->timer, |
1396 | round_jiffies(jiffies + interval)); |
1397 | } |
1398 | } |
1399 | |
1400 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, |
1401 | struct sk_buff *req) |
1402 | { |
1403 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
1404 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1405 | struct ieee80211_local *local = sdata->local; |
1406 | int tx_last_beacon, len = req->len; |
1407 | struct sk_buff *skb; |
1408 | struct beacon_data *presp; |
1409 | u8 *pos, *end; |
1410 | |
1411 | sdata_assert_lock(sdata); |
1412 | |
1413 | presp = rcu_dereference_protected(ifibss->presp, |
1414 | lockdep_is_held(&sdata->wdev.mtx)); |
1415 | |
1416 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
1417 | len < 24 + 2 || !presp) |
1418 | return; |
1419 | |
1420 | tx_last_beacon = drv_tx_last_beacon(local); |
1421 | |
1422 | ibss_dbg(sdata, |
1423 | "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", |
1424 | mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); |
1425 | |
1426 | if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
1427 | return; |
1428 | |
1429 | if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && |
1430 | !is_broadcast_ether_addr(mgmt->bssid)) |
1431 | return; |
1432 | |
1433 | end = ((u8 *) mgmt) + len; |
1434 | pos = mgmt->u.probe_req.variable; |
1435 | if (pos[0] != WLAN_EID_SSID || |
1436 | pos + 2 + pos[1] > end) { |
1437 | ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", |
1438 | mgmt->sa); |
1439 | return; |
1440 | } |
1441 | if (pos[1] != 0 && |
1442 | (pos[1] != ifibss->ssid_len || |
1443 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
1444 | /* Ignore ProbeReq for foreign SSID */ |
1445 | return; |
1446 | } |
1447 | |
1448 | /* Reply with ProbeResp */ |
1449 | skb = dev_alloc_skb(local->tx_headroom + presp->head_len); |
1450 | if (!skb) |
1451 | return; |
1452 | |
1453 | skb_reserve(skb, local->tx_headroom); |
1454 | memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len); |
1455 | |
1456 | memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); |
1457 | ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); |
1458 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
1459 | |
1460 | /* avoid excessive retries for probe request to wildcard SSIDs */ |
1461 | if (pos[1] == 0) |
1462 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; |
1463 | |
1464 | ieee80211_tx_skb(sdata, skb); |
1465 | } |
1466 | |
1467 | static |
1468 | void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, |
1469 | struct ieee80211_mgmt *mgmt, size_t len, |
1470 | struct ieee80211_rx_status *rx_status) |
1471 | { |
1472 | size_t baselen; |
1473 | struct ieee802_11_elems elems; |
1474 | |
1475 | BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != |
1476 | offsetof(typeof(mgmt->u.beacon), variable)); |
1477 | |
1478 | /* |
1479 | * either beacon or probe_resp but the variable field is at the |
1480 | * same offset |
1481 | */ |
1482 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
1483 | if (baselen > len) |
1484 | return; |
1485 | |
1486 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, |
1487 | false, &elems); |
1488 | |
1489 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); |
1490 | } |
1491 | |
1492 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
1493 | struct sk_buff *skb) |
1494 | { |
1495 | struct ieee80211_rx_status *rx_status; |
1496 | struct ieee80211_mgmt *mgmt; |
1497 | u16 fc; |
1498 | struct ieee802_11_elems elems; |
1499 | int ies_len; |
1500 | |
1501 | rx_status = IEEE80211_SKB_RXCB(skb); |
1502 | mgmt = (struct ieee80211_mgmt *) skb->data; |
1503 | fc = le16_to_cpu(mgmt->frame_control); |
1504 | |
1505 | sdata_lock(sdata); |
1506 | |
1507 | if (!sdata->u.ibss.ssid_len) |
1508 | goto mgmt_out; /* not ready to merge yet */ |
1509 | |
1510 | switch (fc & IEEE80211_FCTL_STYPE) { |
1511 | case IEEE80211_STYPE_PROBE_REQ: |
1512 | ieee80211_rx_mgmt_probe_req(sdata, skb); |
1513 | break; |
1514 | case IEEE80211_STYPE_PROBE_RESP: |
1515 | case IEEE80211_STYPE_BEACON: |
1516 | ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, |
1517 | rx_status); |
1518 | break; |
1519 | case IEEE80211_STYPE_AUTH: |
1520 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); |
1521 | break; |
1522 | case IEEE80211_STYPE_DEAUTH: |
1523 | ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); |
1524 | break; |
1525 | case IEEE80211_STYPE_ACTION: |
1526 | switch (mgmt->u.action.category) { |
1527 | case WLAN_CATEGORY_SPECTRUM_MGMT: |
1528 | ies_len = skb->len - |
1529 | offsetof(struct ieee80211_mgmt, |
1530 | u.action.u.chan_switch.variable); |
1531 | |
1532 | if (ies_len < 0) |
1533 | break; |
1534 | |
1535 | ieee802_11_parse_elems( |
1536 | mgmt->u.action.u.chan_switch.variable, |
1537 | ies_len, true, &elems); |
1538 | |
1539 | if (elems.parse_error) |
1540 | break; |
1541 | |
1542 | ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len, |
1543 | rx_status, &elems); |
1544 | break; |
1545 | } |
1546 | } |
1547 | |
1548 | mgmt_out: |
1549 | sdata_unlock(sdata); |
1550 | } |
1551 | |
1552 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
1553 | { |
1554 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1555 | struct sta_info *sta; |
1556 | |
1557 | sdata_lock(sdata); |
1558 | |
1559 | /* |
1560 | * Work could be scheduled after scan or similar |
1561 | * when we aren't even joined (or trying) with a |
1562 | * network. |
1563 | */ |
1564 | if (!ifibss->ssid_len) |
1565 | goto out; |
1566 | |
1567 | spin_lock_bh(&ifibss->incomplete_lock); |
1568 | while (!list_empty(&ifibss->incomplete_stations)) { |
1569 | sta = list_first_entry(&ifibss->incomplete_stations, |
1570 | struct sta_info, list); |
1571 | list_del(&sta->list); |
1572 | spin_unlock_bh(&ifibss->incomplete_lock); |
1573 | |
1574 | ieee80211_ibss_finish_sta(sta); |
1575 | rcu_read_unlock(); |
1576 | spin_lock_bh(&ifibss->incomplete_lock); |
1577 | } |
1578 | spin_unlock_bh(&ifibss->incomplete_lock); |
1579 | |
1580 | switch (ifibss->state) { |
1581 | case IEEE80211_IBSS_MLME_SEARCH: |
1582 | ieee80211_sta_find_ibss(sdata); |
1583 | break; |
1584 | case IEEE80211_IBSS_MLME_JOINED: |
1585 | ieee80211_sta_merge_ibss(sdata); |
1586 | break; |
1587 | default: |
1588 | WARN_ON(1); |
1589 | break; |
1590 | } |
1591 | |
1592 | out: |
1593 | sdata_unlock(sdata); |
1594 | } |
1595 | |
1596 | static void ieee80211_ibss_timer(unsigned long data) |
1597 | { |
1598 | struct ieee80211_sub_if_data *sdata = |
1599 | (struct ieee80211_sub_if_data *) data; |
1600 | |
1601 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
1602 | } |
1603 | |
1604 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
1605 | { |
1606 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1607 | |
1608 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
1609 | (unsigned long) sdata); |
1610 | INIT_LIST_HEAD(&ifibss->incomplete_stations); |
1611 | spin_lock_init(&ifibss->incomplete_lock); |
1612 | INIT_WORK(&ifibss->csa_connection_drop_work, |
1613 | ieee80211_csa_connection_drop_work); |
1614 | } |
1615 | |
1616 | /* scan finished notification */ |
1617 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) |
1618 | { |
1619 | struct ieee80211_sub_if_data *sdata; |
1620 | |
1621 | mutex_lock(&local->iflist_mtx); |
1622 | list_for_each_entry(sdata, &local->interfaces, list) { |
1623 | if (!ieee80211_sdata_running(sdata)) |
1624 | continue; |
1625 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
1626 | continue; |
1627 | sdata->u.ibss.last_scan_completed = jiffies; |
1628 | ieee80211_queue_work(&local->hw, &sdata->work); |
1629 | } |
1630 | mutex_unlock(&local->iflist_mtx); |
1631 | } |
1632 | |
1633 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
1634 | struct cfg80211_ibss_params *params) |
1635 | { |
1636 | u32 changed = 0; |
1637 | u32 rate_flags; |
1638 | struct ieee80211_supported_band *sband; |
1639 | int i; |
1640 | |
1641 | if (params->bssid) { |
1642 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); |
1643 | sdata->u.ibss.fixed_bssid = true; |
1644 | } else |
1645 | sdata->u.ibss.fixed_bssid = false; |
1646 | |
1647 | sdata->u.ibss.privacy = params->privacy; |
1648 | sdata->u.ibss.control_port = params->control_port; |
1649 | sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; |
1650 | sdata->u.ibss.basic_rates = params->basic_rates; |
1651 | |
1652 | /* fix basic_rates if channel does not support these rates */ |
1653 | rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); |
1654 | sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band]; |
1655 | for (i = 0; i < sband->n_bitrates; i++) { |
1656 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) |
1657 | sdata->u.ibss.basic_rates &= ~BIT(i); |
1658 | } |
1659 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
1660 | sizeof(params->mcast_rate)); |
1661 | |
1662 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
1663 | |
1664 | sdata->u.ibss.chandef = params->chandef; |
1665 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
1666 | |
1667 | if (params->ie) { |
1668 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, |
1669 | GFP_KERNEL); |
1670 | if (sdata->u.ibss.ie) |
1671 | sdata->u.ibss.ie_len = params->ie_len; |
1672 | } |
1673 | |
1674 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
1675 | sdata->u.ibss.ibss_join_req = jiffies; |
1676 | |
1677 | memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); |
1678 | sdata->u.ibss.ssid_len = params->ssid_len; |
1679 | |
1680 | memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, |
1681 | sizeof(sdata->u.ibss.ht_capa)); |
1682 | memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, |
1683 | sizeof(sdata->u.ibss.ht_capa_mask)); |
1684 | |
1685 | /* |
1686 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is |
1687 | * reserved, but an HT STA shall protect HT transmissions as though |
1688 | * the HT Protection field were set to non-HT mixed mode. |
1689 | * |
1690 | * In an IBSS, the RIFS Mode field of the HT Operation element is |
1691 | * also reserved, but an HT STA shall operate as though this field |
1692 | * were set to 1. |
1693 | */ |
1694 | |
1695 | sdata->vif.bss_conf.ht_operation_mode |= |
1696 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1697 | | IEEE80211_HT_PARAM_RIFS_MODE; |
1698 | |
1699 | changed |= BSS_CHANGED_HT; |
1700 | ieee80211_bss_info_change_notify(sdata, changed); |
1701 | |
1702 | sdata->smps_mode = IEEE80211_SMPS_OFF; |
1703 | sdata->needed_rx_chains = sdata->local->rx_chains; |
1704 | |
1705 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
1706 | |
1707 | return 0; |
1708 | } |
1709 | |
1710 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) |
1711 | { |
1712 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1713 | |
1714 | ieee80211_ibss_disconnect(sdata); |
1715 | ifibss->ssid_len = 0; |
1716 | memset(ifibss->bssid, 0, ETH_ALEN); |
1717 | |
1718 | /* remove beacon */ |
1719 | kfree(sdata->u.ibss.ie); |
1720 | |
1721 | /* on the next join, re-program HT parameters */ |
1722 | memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); |
1723 | memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); |
1724 | |
1725 | synchronize_rcu(); |
1726 | |
1727 | skb_queue_purge(&sdata->skb_queue); |
1728 | |
1729 | del_timer_sync(&sdata->u.ibss.timer); |
1730 | |
1731 | return 0; |
1732 | } |
1733 |
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