1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * IBSS mode implementation |
4 | * Copyright 2003-2008, Jouni Malinen <j@w1.fi> |
5 | * Copyright 2004, Instant802 Networks, Inc. |
6 | * Copyright 2005, Devicescape Software, Inc. |
7 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
8 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> |
9 | * Copyright 2009, Johannes Berg <johannes@sipsolutions.net> |
10 | * Copyright 2013-2014 Intel Mobile Communications GmbH |
11 | * Copyright(c) 2016 Intel Deutschland GmbH |
12 | * Copyright(c) 2018-2023 Intel Corporation |
13 | */ |
14 | |
15 | #include <linux/delay.h> |
16 | #include <linux/slab.h> |
17 | #include <linux/if_ether.h> |
18 | #include <linux/skbuff.h> |
19 | #include <linux/if_arp.h> |
20 | #include <linux/etherdevice.h> |
21 | #include <linux/rtnetlink.h> |
22 | #include <net/mac80211.h> |
23 | |
24 | #include "ieee80211_i.h" |
25 | #include "driver-ops.h" |
26 | #include "rate.h" |
27 | |
28 | #define IEEE80211_SCAN_INTERVAL (2 * HZ) |
29 | #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) |
30 | |
31 | #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) |
32 | #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) |
33 | #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ) |
34 | |
35 | #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 |
36 | |
37 | static struct beacon_data * |
38 | ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata, |
39 | const int beacon_int, const u32 basic_rates, |
40 | const u16 capability, u64 tsf, |
41 | struct cfg80211_chan_def *chandef, |
42 | bool *have_higher_than_11mbit, |
43 | struct cfg80211_csa_settings *csa_settings) |
44 | { |
45 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46 | struct ieee80211_local *local = sdata->local; |
47 | int rates_n = 0, i, ri; |
48 | struct ieee80211_mgmt *mgmt; |
49 | u8 *pos; |
50 | struct ieee80211_supported_band *sband; |
51 | u32 rate_flags, rates = 0, rates_added = 0; |
52 | struct beacon_data *presp; |
53 | int frame_len; |
54 | |
55 | /* Build IBSS probe response */ |
56 | frame_len = sizeof(struct ieee80211_hdr_3addr) + |
57 | 12 /* struct ieee80211_mgmt.u.beacon */ + |
58 | 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + |
59 | 2 + 8 /* max Supported Rates */ + |
60 | 3 /* max DS params */ + |
61 | 4 /* IBSS params */ + |
62 | 5 /* Channel Switch Announcement */ + |
63 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + |
64 | 2 + sizeof(struct ieee80211_ht_cap) + |
65 | 2 + sizeof(struct ieee80211_ht_operation) + |
66 | 2 + sizeof(struct ieee80211_vht_cap) + |
67 | 2 + sizeof(struct ieee80211_vht_operation) + |
68 | ifibss->ie_len; |
69 | presp = kzalloc(size: sizeof(*presp) + frame_len, GFP_KERNEL); |
70 | if (!presp) |
71 | return NULL; |
72 | |
73 | presp->head = (void *)(presp + 1); |
74 | |
75 | mgmt = (void *) presp->head; |
76 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
77 | IEEE80211_STYPE_PROBE_RESP); |
78 | eth_broadcast_addr(addr: mgmt->da); |
79 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
80 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
81 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
82 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
83 | mgmt->u.beacon.capab_info = cpu_to_le16(capability); |
84 | |
85 | pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable); |
86 | |
87 | *pos++ = WLAN_EID_SSID; |
88 | *pos++ = ifibss->ssid_len; |
89 | memcpy(pos, ifibss->ssid, ifibss->ssid_len); |
90 | pos += ifibss->ssid_len; |
91 | |
92 | sband = local->hw.wiphy->bands[chandef->chan->band]; |
93 | rate_flags = ieee80211_chandef_rate_flags(chandef); |
94 | rates_n = 0; |
95 | if (have_higher_than_11mbit) |
96 | *have_higher_than_11mbit = false; |
97 | |
98 | for (i = 0; i < sband->n_bitrates; i++) { |
99 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) |
100 | continue; |
101 | if (sband->bitrates[i].bitrate > 110 && |
102 | have_higher_than_11mbit) |
103 | *have_higher_than_11mbit = true; |
104 | |
105 | rates |= BIT(i); |
106 | rates_n++; |
107 | } |
108 | |
109 | *pos++ = WLAN_EID_SUPP_RATES; |
110 | *pos++ = min_t(int, 8, rates_n); |
111 | for (ri = 0; ri < sband->n_bitrates; ri++) { |
112 | int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 5); |
113 | u8 basic = 0; |
114 | if (!(rates & BIT(ri))) |
115 | continue; |
116 | |
117 | if (basic_rates & BIT(ri)) |
118 | basic = 0x80; |
119 | *pos++ = basic | (u8) rate; |
120 | if (++rates_added == 8) { |
121 | ri++; /* continue at next rate for EXT_SUPP_RATES */ |
122 | break; |
123 | } |
124 | } |
125 | |
126 | if (sband->band == NL80211_BAND_2GHZ) { |
127 | *pos++ = WLAN_EID_DS_PARAMS; |
128 | *pos++ = 1; |
129 | *pos++ = ieee80211_frequency_to_channel( |
130 | freq: chandef->chan->center_freq); |
131 | } |
132 | |
133 | *pos++ = WLAN_EID_IBSS_PARAMS; |
134 | *pos++ = 2; |
135 | /* FIX: set ATIM window based on scan results */ |
136 | *pos++ = 0; |
137 | *pos++ = 0; |
138 | |
139 | if (csa_settings) { |
140 | *pos++ = WLAN_EID_CHANNEL_SWITCH; |
141 | *pos++ = 3; |
142 | *pos++ = csa_settings->block_tx ? 1 : 0; |
143 | *pos++ = ieee80211_frequency_to_channel( |
144 | freq: csa_settings->chandef.chan->center_freq); |
145 | presp->cntdwn_counter_offsets[0] = (pos - presp->head); |
146 | *pos++ = csa_settings->count; |
147 | presp->cntdwn_current_counter = csa_settings->count; |
148 | } |
149 | |
150 | /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ |
151 | if (rates_n > 8) { |
152 | *pos++ = WLAN_EID_EXT_SUPP_RATES; |
153 | *pos++ = rates_n - 8; |
154 | for (; ri < sband->n_bitrates; ri++) { |
155 | int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 5); |
156 | u8 basic = 0; |
157 | if (!(rates & BIT(ri))) |
158 | continue; |
159 | |
160 | if (basic_rates & BIT(ri)) |
161 | basic = 0x80; |
162 | *pos++ = basic | (u8) rate; |
163 | } |
164 | } |
165 | |
166 | if (ifibss->ie_len) { |
167 | memcpy(pos, ifibss->ie, ifibss->ie_len); |
168 | pos += ifibss->ie_len; |
169 | } |
170 | |
171 | /* add HT capability and information IEs */ |
172 | if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT && |
173 | chandef->width != NL80211_CHAN_WIDTH_5 && |
174 | chandef->width != NL80211_CHAN_WIDTH_10 && |
175 | sband->ht_cap.ht_supported) { |
176 | struct ieee80211_sta_ht_cap ht_cap; |
177 | |
178 | memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); |
179 | ieee80211_apply_htcap_overrides(sdata, ht_cap: &ht_cap); |
180 | |
181 | pos = ieee80211_ie_build_ht_cap(pos, ht_cap: &ht_cap, cap: ht_cap.cap); |
182 | /* |
183 | * Note: According to 802.11n-2009 9.13.3.1, HT Protection |
184 | * field and RIFS Mode are reserved in IBSS mode, therefore |
185 | * keep them at 0 |
186 | */ |
187 | pos = ieee80211_ie_build_ht_oper(pos, ht_cap: &sband->ht_cap, |
188 | chandef, prot_mode: 0, rifs_mode: false); |
189 | |
190 | /* add VHT capability and information IEs */ |
191 | if (chandef->width != NL80211_CHAN_WIDTH_20 && |
192 | chandef->width != NL80211_CHAN_WIDTH_40 && |
193 | sband->vht_cap.vht_supported) { |
194 | pos = ieee80211_ie_build_vht_cap(pos, vht_cap: &sband->vht_cap, |
195 | cap: sband->vht_cap.cap); |
196 | pos = ieee80211_ie_build_vht_oper(pos, vht_cap: &sband->vht_cap, |
197 | chandef); |
198 | } |
199 | } |
200 | |
201 | if (local->hw.queues >= IEEE80211_NUM_ACS) |
202 | pos = ieee80211_add_wmm_info_ie(buf: pos, qosinfo: 0); /* U-APSD not in use */ |
203 | |
204 | presp->head_len = pos - presp->head; |
205 | if (WARN_ON(presp->head_len > frame_len)) |
206 | goto error; |
207 | |
208 | return presp; |
209 | error: |
210 | kfree(objp: 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 | u64 bss_change; |
226 | struct cfg80211_chan_def chandef; |
227 | struct ieee80211_channel *chan; |
228 | struct beacon_data *presp; |
229 | struct cfg80211_inform_bss bss_meta = {}; |
230 | bool have_higher_than_11mbit; |
231 | bool radar_required; |
232 | int err; |
233 | |
234 | lockdep_assert_wiphy(local->hw.wiphy); |
235 | |
236 | /* Reset own TSF to allow time synchronization work. */ |
237 | drv_reset_tsf(local, sdata); |
238 | |
239 | if (!ether_addr_equal(addr1: ifibss->bssid, addr2: bssid)) |
240 | sta_info_flush(sdata); |
241 | |
242 | /* if merging, indicate to driver that we leave the old IBSS */ |
243 | if (sdata->vif.cfg.ibss_joined) { |
244 | sdata->vif.cfg.ibss_joined = false; |
245 | sdata->vif.cfg.ibss_creator = false; |
246 | sdata->vif.bss_conf.enable_beacon = false; |
247 | netif_carrier_off(dev: sdata->dev); |
248 | ieee80211_bss_info_change_notify(sdata, |
249 | changed: BSS_CHANGED_IBSS | |
250 | BSS_CHANGED_BEACON_ENABLED); |
251 | drv_leave_ibss(local, sdata); |
252 | } |
253 | |
254 | presp = sdata_dereference(ifibss->presp, sdata); |
255 | RCU_INIT_POINTER(ifibss->presp, NULL); |
256 | if (presp) |
257 | kfree_rcu(presp, rcu_head); |
258 | |
259 | /* make a copy of the chandef, it could be modified below. */ |
260 | chandef = *req_chandef; |
261 | chan = chandef.chan; |
262 | if (!cfg80211_reg_can_beacon(wiphy: local->hw.wiphy, chandef: &chandef, |
263 | iftype: NL80211_IFTYPE_ADHOC)) { |
264 | if (chandef.width == NL80211_CHAN_WIDTH_5 || |
265 | chandef.width == NL80211_CHAN_WIDTH_10 || |
266 | chandef.width == NL80211_CHAN_WIDTH_20_NOHT || |
267 | chandef.width == NL80211_CHAN_WIDTH_20) { |
268 | sdata_info(sdata, |
269 | "Failed to join IBSS, beacons forbidden\n" ); |
270 | return; |
271 | } |
272 | chandef.width = NL80211_CHAN_WIDTH_20; |
273 | chandef.center_freq1 = chan->center_freq; |
274 | /* check again for downgraded chandef */ |
275 | if (!cfg80211_reg_can_beacon(wiphy: local->hw.wiphy, chandef: &chandef, |
276 | iftype: NL80211_IFTYPE_ADHOC)) { |
277 | sdata_info(sdata, |
278 | "Failed to join IBSS, beacons forbidden\n" ); |
279 | return; |
280 | } |
281 | } |
282 | |
283 | err = cfg80211_chandef_dfs_required(wiphy: sdata->local->hw.wiphy, |
284 | chandef: &chandef, iftype: NL80211_IFTYPE_ADHOC); |
285 | if (err < 0) { |
286 | sdata_info(sdata, |
287 | "Failed to join IBSS, invalid chandef\n" ); |
288 | return; |
289 | } |
290 | if (err > 0 && !ifibss->userspace_handles_dfs) { |
291 | sdata_info(sdata, |
292 | "Failed to join IBSS, DFS channel without control program\n" ); |
293 | return; |
294 | } |
295 | |
296 | radar_required = err; |
297 | |
298 | if (ieee80211_link_use_channel(link: &sdata->deflink, chandef: &chandef, |
299 | mode: ifibss->fixed_channel ? |
300 | IEEE80211_CHANCTX_SHARED : |
301 | IEEE80211_CHANCTX_EXCLUSIVE)) { |
302 | sdata_info(sdata, "Failed to join IBSS, no channel context\n" ); |
303 | return; |
304 | } |
305 | sdata->deflink.radar_required = radar_required; |
306 | |
307 | memcpy(ifibss->bssid, bssid, ETH_ALEN); |
308 | |
309 | presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates, |
310 | capability, tsf, chandef: &chandef, |
311 | have_higher_than_11mbit: &have_higher_than_11mbit, NULL); |
312 | if (!presp) |
313 | return; |
314 | |
315 | rcu_assign_pointer(ifibss->presp, presp); |
316 | mgmt = (void *)presp->head; |
317 | |
318 | sdata->vif.bss_conf.enable_beacon = true; |
319 | sdata->vif.bss_conf.beacon_int = beacon_int; |
320 | sdata->vif.bss_conf.basic_rates = basic_rates; |
321 | sdata->vif.cfg.ssid_len = ifibss->ssid_len; |
322 | memcpy(sdata->vif.cfg.ssid, ifibss->ssid, ifibss->ssid_len); |
323 | bss_change = BSS_CHANGED_BEACON_INT; |
324 | bss_change |= ieee80211_reset_erp_info(sdata); |
325 | bss_change |= BSS_CHANGED_BSSID; |
326 | bss_change |= BSS_CHANGED_BEACON; |
327 | bss_change |= BSS_CHANGED_BEACON_ENABLED; |
328 | bss_change |= BSS_CHANGED_BASIC_RATES; |
329 | bss_change |= BSS_CHANGED_HT; |
330 | bss_change |= BSS_CHANGED_IBSS; |
331 | bss_change |= BSS_CHANGED_SSID; |
332 | |
333 | /* |
334 | * In 5 GHz/802.11a, we can always use short slot time. |
335 | * (IEEE 802.11-2012 18.3.8.7) |
336 | * |
337 | * In 2.4GHz, we must always use long slots in IBSS for compatibility |
338 | * reasons. |
339 | * (IEEE 802.11-2012 19.4.5) |
340 | * |
341 | * HT follows these specifications (IEEE 802.11-2012 20.3.18) |
342 | */ |
343 | sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ; |
344 | bss_change |= BSS_CHANGED_ERP_SLOT; |
345 | |
346 | /* cf. IEEE 802.11 9.2.12 */ |
347 | sdata->deflink.operating_11g_mode = |
348 | chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit; |
349 | |
350 | ieee80211_set_wmm_default(link: &sdata->deflink, bss_notify: true, enable_qos: false); |
351 | |
352 | sdata->vif.cfg.ibss_joined = true; |
353 | sdata->vif.cfg.ibss_creator = creator; |
354 | |
355 | err = drv_join_ibss(local, sdata); |
356 | if (err) { |
357 | sdata->vif.cfg.ibss_joined = false; |
358 | sdata->vif.cfg.ibss_creator = false; |
359 | sdata->vif.bss_conf.enable_beacon = false; |
360 | sdata->vif.cfg.ssid_len = 0; |
361 | RCU_INIT_POINTER(ifibss->presp, NULL); |
362 | kfree_rcu(presp, rcu_head); |
363 | ieee80211_link_release_channel(link: &sdata->deflink); |
364 | sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n" , |
365 | err); |
366 | return; |
367 | } |
368 | |
369 | ieee80211_bss_info_change_notify(sdata, changed: bss_change); |
370 | |
371 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
372 | mod_timer(timer: &ifibss->timer, |
373 | expires: round_jiffies(j: jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); |
374 | |
375 | bss_meta.chan = chan; |
376 | bss = cfg80211_inform_bss_frame_data(wiphy: local->hw.wiphy, data: &bss_meta, mgmt, |
377 | len: presp->head_len, GFP_KERNEL); |
378 | |
379 | cfg80211_put_bss(wiphy: local->hw.wiphy, bss); |
380 | netif_carrier_on(dev: sdata->dev); |
381 | cfg80211_ibss_joined(dev: sdata->dev, bssid: ifibss->bssid, channel: chan, GFP_KERNEL); |
382 | } |
383 | |
384 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
385 | struct ieee80211_bss *bss) |
386 | { |
387 | struct cfg80211_bss *cbss = |
388 | container_of((void *)bss, struct cfg80211_bss, priv); |
389 | struct ieee80211_supported_band *sband; |
390 | struct cfg80211_chan_def chandef; |
391 | u32 basic_rates; |
392 | int i, j; |
393 | u16 beacon_int = cbss->beacon_interval; |
394 | const struct cfg80211_bss_ies *ies; |
395 | enum nl80211_channel_type chan_type; |
396 | u64 tsf; |
397 | u32 rate_flags; |
398 | |
399 | lockdep_assert_wiphy(sdata->local->hw.wiphy); |
400 | |
401 | if (beacon_int < 10) |
402 | beacon_int = 10; |
403 | |
404 | switch (sdata->u.ibss.chandef.width) { |
405 | case NL80211_CHAN_WIDTH_20_NOHT: |
406 | case NL80211_CHAN_WIDTH_20: |
407 | case NL80211_CHAN_WIDTH_40: |
408 | chan_type = cfg80211_get_chandef_type(chandef: &sdata->u.ibss.chandef); |
409 | cfg80211_chandef_create(chandef: &chandef, channel: cbss->channel, chantype: chan_type); |
410 | break; |
411 | case NL80211_CHAN_WIDTH_5: |
412 | case NL80211_CHAN_WIDTH_10: |
413 | cfg80211_chandef_create(chandef: &chandef, channel: cbss->channel, |
414 | chantype: NL80211_CHAN_NO_HT); |
415 | chandef.width = sdata->u.ibss.chandef.width; |
416 | break; |
417 | case NL80211_CHAN_WIDTH_80: |
418 | case NL80211_CHAN_WIDTH_80P80: |
419 | case NL80211_CHAN_WIDTH_160: |
420 | chandef = sdata->u.ibss.chandef; |
421 | chandef.chan = cbss->channel; |
422 | break; |
423 | default: |
424 | /* fall back to 20 MHz for unsupported modes */ |
425 | cfg80211_chandef_create(chandef: &chandef, channel: cbss->channel, |
426 | chantype: NL80211_CHAN_NO_HT); |
427 | break; |
428 | } |
429 | |
430 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
431 | rate_flags = ieee80211_chandef_rate_flags(chandef: &sdata->u.ibss.chandef); |
432 | |
433 | basic_rates = 0; |
434 | |
435 | for (i = 0; i < bss->supp_rates_len; i++) { |
436 | int rate = bss->supp_rates[i] & 0x7f; |
437 | bool is_basic = !!(bss->supp_rates[i] & 0x80); |
438 | |
439 | for (j = 0; j < sband->n_bitrates; j++) { |
440 | int brate; |
441 | if ((rate_flags & sband->bitrates[j].flags) |
442 | != rate_flags) |
443 | continue; |
444 | |
445 | brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 5); |
446 | if (brate == rate) { |
447 | if (is_basic) |
448 | basic_rates |= BIT(j); |
449 | break; |
450 | } |
451 | } |
452 | } |
453 | |
454 | rcu_read_lock(); |
455 | ies = rcu_dereference(cbss->ies); |
456 | tsf = ies->tsf; |
457 | rcu_read_unlock(); |
458 | |
459 | __ieee80211_sta_join_ibss(sdata, bssid: cbss->bssid, |
460 | beacon_int, |
461 | req_chandef: &chandef, |
462 | basic_rates, |
463 | capability: cbss->capability, |
464 | tsf, creator: false); |
465 | } |
466 | |
467 | int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata, |
468 | struct cfg80211_csa_settings *csa_settings, |
469 | u64 *changed) |
470 | { |
471 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
472 | struct beacon_data *presp, *old_presp; |
473 | struct cfg80211_bss *cbss; |
474 | const struct cfg80211_bss_ies *ies; |
475 | u16 capability = WLAN_CAPABILITY_IBSS; |
476 | u64 tsf; |
477 | |
478 | lockdep_assert_wiphy(sdata->local->hw.wiphy); |
479 | |
480 | if (ifibss->privacy) |
481 | capability |= WLAN_CAPABILITY_PRIVACY; |
482 | |
483 | cbss = cfg80211_get_bss(wiphy: sdata->local->hw.wiphy, channel: ifibss->chandef.chan, |
484 | bssid: ifibss->bssid, ssid: ifibss->ssid, |
485 | ssid_len: ifibss->ssid_len, bss_type: IEEE80211_BSS_TYPE_IBSS, |
486 | IEEE80211_PRIVACY(ifibss->privacy)); |
487 | |
488 | if (WARN_ON(!cbss)) |
489 | return -EINVAL; |
490 | |
491 | rcu_read_lock(); |
492 | ies = rcu_dereference(cbss->ies); |
493 | tsf = ies->tsf; |
494 | rcu_read_unlock(); |
495 | cfg80211_put_bss(wiphy: sdata->local->hw.wiphy, bss: cbss); |
496 | |
497 | old_presp = sdata_dereference(ifibss->presp, sdata); |
498 | |
499 | presp = ieee80211_ibss_build_presp(sdata, |
500 | beacon_int: sdata->vif.bss_conf.beacon_int, |
501 | basic_rates: sdata->vif.bss_conf.basic_rates, |
502 | capability, tsf, chandef: &ifibss->chandef, |
503 | NULL, csa_settings); |
504 | if (!presp) |
505 | return -ENOMEM; |
506 | |
507 | rcu_assign_pointer(ifibss->presp, presp); |
508 | if (old_presp) |
509 | kfree_rcu(old_presp, rcu_head); |
510 | |
511 | *changed |= BSS_CHANGED_BEACON; |
512 | return 0; |
513 | } |
514 | |
515 | int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata, u64 *changed) |
516 | { |
517 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
518 | struct cfg80211_bss *cbss; |
519 | |
520 | lockdep_assert_wiphy(sdata->local->hw.wiphy); |
521 | |
522 | /* When not connected/joined, sending CSA doesn't make sense. */ |
523 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED) |
524 | return -ENOLINK; |
525 | |
526 | /* update cfg80211 bss information with the new channel */ |
527 | if (!is_zero_ether_addr(addr: ifibss->bssid)) { |
528 | cbss = cfg80211_get_bss(wiphy: sdata->local->hw.wiphy, |
529 | channel: ifibss->chandef.chan, |
530 | bssid: ifibss->bssid, ssid: ifibss->ssid, |
531 | ssid_len: ifibss->ssid_len, |
532 | bss_type: IEEE80211_BSS_TYPE_IBSS, |
533 | IEEE80211_PRIVACY(ifibss->privacy)); |
534 | /* XXX: should not really modify cfg80211 data */ |
535 | if (cbss) { |
536 | cbss->channel = sdata->deflink.csa_chandef.chan; |
537 | cfg80211_put_bss(wiphy: sdata->local->hw.wiphy, bss: cbss); |
538 | } |
539 | } |
540 | |
541 | ifibss->chandef = sdata->deflink.csa_chandef; |
542 | |
543 | /* generate the beacon */ |
544 | return ieee80211_ibss_csa_beacon(sdata, NULL, changed); |
545 | } |
546 | |
547 | void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata) |
548 | { |
549 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
550 | |
551 | wiphy_work_cancel(wiphy: sdata->local->hw.wiphy, |
552 | work: &ifibss->csa_connection_drop_work); |
553 | } |
554 | |
555 | static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) |
556 | __acquires(RCU) |
557 | { |
558 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
559 | u8 addr[ETH_ALEN]; |
560 | |
561 | memcpy(addr, sta->sta.addr, ETH_ALEN); |
562 | |
563 | ibss_dbg(sdata, "Adding new IBSS station %pM\n" , addr); |
564 | |
565 | sta_info_pre_move_state(sta, new_state: IEEE80211_STA_AUTH); |
566 | sta_info_pre_move_state(sta, new_state: IEEE80211_STA_ASSOC); |
567 | /* authorize the station only if the network is not RSN protected. If |
568 | * not wait for the userspace to authorize it */ |
569 | if (!sta->sdata->u.ibss.control_port) |
570 | sta_info_pre_move_state(sta, new_state: IEEE80211_STA_AUTHORIZED); |
571 | |
572 | rate_control_rate_init(sta); |
573 | |
574 | /* If it fails, maybe we raced another insertion? */ |
575 | if (sta_info_insert_rcu(sta)) |
576 | return sta_info_get(sdata, addr); |
577 | return sta; |
578 | } |
579 | |
580 | static struct sta_info * |
581 | ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, |
582 | const u8 *addr, u32 supp_rates) |
583 | __acquires(RCU) |
584 | { |
585 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
586 | struct ieee80211_local *local = sdata->local; |
587 | struct sta_info *sta; |
588 | struct ieee80211_chanctx_conf *chanctx_conf; |
589 | struct ieee80211_supported_band *sband; |
590 | int band; |
591 | |
592 | /* |
593 | * XXX: Consider removing the least recently used entry and |
594 | * allow new one to be added. |
595 | */ |
596 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
597 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n" , |
598 | sdata->name, addr); |
599 | rcu_read_lock(); |
600 | return NULL; |
601 | } |
602 | |
603 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { |
604 | rcu_read_lock(); |
605 | return NULL; |
606 | } |
607 | |
608 | if (!ether_addr_equal(addr1: bssid, addr2: sdata->u.ibss.bssid)) { |
609 | rcu_read_lock(); |
610 | return NULL; |
611 | } |
612 | |
613 | rcu_read_lock(); |
614 | chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); |
615 | if (WARN_ON_ONCE(!chanctx_conf)) |
616 | return NULL; |
617 | band = chanctx_conf->def.chan->band; |
618 | rcu_read_unlock(); |
619 | |
620 | sta = sta_info_alloc(sdata, addr, GFP_KERNEL); |
621 | if (!sta) { |
622 | rcu_read_lock(); |
623 | return NULL; |
624 | } |
625 | |
626 | /* make sure mandatory rates are always added */ |
627 | sband = local->hw.wiphy->bands[band]; |
628 | sta->sta.deflink.supp_rates[band] = supp_rates | |
629 | ieee80211_mandatory_rates(sband); |
630 | |
631 | return ieee80211_ibss_finish_sta(sta); |
632 | } |
633 | |
634 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) |
635 | { |
636 | struct ieee80211_local *local = sdata->local; |
637 | int active = 0; |
638 | struct sta_info *sta; |
639 | |
640 | lockdep_assert_wiphy(sdata->local->hw.wiphy); |
641 | |
642 | rcu_read_lock(); |
643 | |
644 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
645 | unsigned long last_active = ieee80211_sta_last_active(sta); |
646 | |
647 | if (sta->sdata == sdata && |
648 | time_is_after_jiffies(last_active + |
649 | IEEE80211_IBSS_MERGE_INTERVAL)) { |
650 | active++; |
651 | break; |
652 | } |
653 | } |
654 | |
655 | rcu_read_unlock(); |
656 | |
657 | return active; |
658 | } |
659 | |
660 | static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) |
661 | { |
662 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
663 | struct ieee80211_local *local = sdata->local; |
664 | struct cfg80211_bss *cbss; |
665 | struct beacon_data *presp; |
666 | struct sta_info *sta; |
667 | |
668 | lockdep_assert_wiphy(local->hw.wiphy); |
669 | |
670 | if (!is_zero_ether_addr(addr: ifibss->bssid)) { |
671 | cbss = cfg80211_get_bss(wiphy: local->hw.wiphy, channel: ifibss->chandef.chan, |
672 | bssid: ifibss->bssid, ssid: ifibss->ssid, |
673 | ssid_len: ifibss->ssid_len, |
674 | bss_type: IEEE80211_BSS_TYPE_IBSS, |
675 | IEEE80211_PRIVACY(ifibss->privacy)); |
676 | |
677 | if (cbss) { |
678 | cfg80211_unlink_bss(wiphy: local->hw.wiphy, bss: cbss); |
679 | cfg80211_put_bss(wiphy: sdata->local->hw.wiphy, bss: cbss); |
680 | } |
681 | } |
682 | |
683 | ifibss->state = IEEE80211_IBSS_MLME_SEARCH; |
684 | |
685 | sta_info_flush(sdata); |
686 | |
687 | spin_lock_bh(lock: &ifibss->incomplete_lock); |
688 | while (!list_empty(head: &ifibss->incomplete_stations)) { |
689 | sta = list_first_entry(&ifibss->incomplete_stations, |
690 | struct sta_info, list); |
691 | list_del(entry: &sta->list); |
692 | spin_unlock_bh(lock: &ifibss->incomplete_lock); |
693 | |
694 | sta_info_free(local, sta); |
695 | spin_lock_bh(lock: &ifibss->incomplete_lock); |
696 | } |
697 | spin_unlock_bh(lock: &ifibss->incomplete_lock); |
698 | |
699 | netif_carrier_off(dev: sdata->dev); |
700 | |
701 | sdata->vif.cfg.ibss_joined = false; |
702 | sdata->vif.cfg.ibss_creator = false; |
703 | sdata->vif.bss_conf.enable_beacon = false; |
704 | sdata->vif.cfg.ssid_len = 0; |
705 | |
706 | /* remove beacon */ |
707 | presp = sdata_dereference(ifibss->presp, sdata); |
708 | RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); |
709 | if (presp) |
710 | kfree_rcu(presp, rcu_head); |
711 | |
712 | clear_bit(nr: SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, addr: &sdata->state); |
713 | ieee80211_bss_info_change_notify(sdata, changed: BSS_CHANGED_BEACON_ENABLED | |
714 | BSS_CHANGED_IBSS); |
715 | drv_leave_ibss(local, sdata); |
716 | ieee80211_link_release_channel(link: &sdata->deflink); |
717 | } |
718 | |
719 | static void ieee80211_csa_connection_drop_work(struct wiphy *wiphy, |
720 | struct wiphy_work *work) |
721 | { |
722 | struct ieee80211_sub_if_data *sdata = |
723 | container_of(work, struct ieee80211_sub_if_data, |
724 | u.ibss.csa_connection_drop_work); |
725 | |
726 | ieee80211_ibss_disconnect(sdata); |
727 | synchronize_rcu(); |
728 | skb_queue_purge(list: &sdata->skb_queue); |
729 | |
730 | /* trigger a scan to find another IBSS network to join */ |
731 | wiphy_work_queue(wiphy: sdata->local->hw.wiphy, work: &sdata->work); |
732 | } |
733 | |
734 | static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) |
735 | { |
736 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
737 | int err; |
738 | |
739 | /* if the current channel is a DFS channel, mark the channel as |
740 | * unavailable. |
741 | */ |
742 | err = cfg80211_chandef_dfs_required(wiphy: sdata->local->hw.wiphy, |
743 | chandef: &ifibss->chandef, |
744 | iftype: NL80211_IFTYPE_ADHOC); |
745 | if (err > 0) |
746 | cfg80211_radar_event(wiphy: sdata->local->hw.wiphy, chandef: &ifibss->chandef, |
747 | GFP_ATOMIC); |
748 | } |
749 | |
750 | static bool |
751 | ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, |
752 | struct ieee802_11_elems *elems, |
753 | bool beacon) |
754 | { |
755 | struct cfg80211_csa_settings params; |
756 | struct ieee80211_csa_ie csa_ie; |
757 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
758 | enum nl80211_channel_type ch_type; |
759 | int err; |
760 | ieee80211_conn_flags_t conn_flags; |
761 | u32 vht_cap_info = 0; |
762 | |
763 | lockdep_assert_wiphy(sdata->local->hw.wiphy); |
764 | |
765 | conn_flags = IEEE80211_CONN_DISABLE_VHT; |
766 | |
767 | switch (ifibss->chandef.width) { |
768 | case NL80211_CHAN_WIDTH_5: |
769 | case NL80211_CHAN_WIDTH_10: |
770 | case NL80211_CHAN_WIDTH_20_NOHT: |
771 | conn_flags |= IEEE80211_CONN_DISABLE_HT; |
772 | fallthrough; |
773 | case NL80211_CHAN_WIDTH_20: |
774 | conn_flags |= IEEE80211_CONN_DISABLE_40MHZ; |
775 | break; |
776 | default: |
777 | break; |
778 | } |
779 | |
780 | if (elems->vht_cap_elem) |
781 | vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info); |
782 | |
783 | memset(¶ms, 0, sizeof(params)); |
784 | err = ieee80211_parse_ch_switch_ie(sdata, elems, |
785 | current_band: ifibss->chandef.chan->band, |
786 | vht_cap_info, |
787 | conn_flags, bssid: ifibss->bssid, csa_ie: &csa_ie); |
788 | /* can't switch to destination channel, fail */ |
789 | if (err < 0) |
790 | goto disconnect; |
791 | |
792 | /* did not contain a CSA */ |
793 | if (err) |
794 | return false; |
795 | |
796 | /* channel switch is not supported, disconnect */ |
797 | if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) |
798 | goto disconnect; |
799 | |
800 | params.count = csa_ie.count; |
801 | params.chandef = csa_ie.chandef; |
802 | |
803 | switch (ifibss->chandef.width) { |
804 | case NL80211_CHAN_WIDTH_20_NOHT: |
805 | case NL80211_CHAN_WIDTH_20: |
806 | case NL80211_CHAN_WIDTH_40: |
807 | /* keep our current HT mode (HT20/HT40+/HT40-), even if |
808 | * another mode has been announced. The mode is not adopted |
809 | * within the beacon while doing CSA and we should therefore |
810 | * keep the mode which we announce. |
811 | */ |
812 | ch_type = cfg80211_get_chandef_type(chandef: &ifibss->chandef); |
813 | cfg80211_chandef_create(chandef: ¶ms.chandef, channel: params.chandef.chan, |
814 | chantype: ch_type); |
815 | break; |
816 | case NL80211_CHAN_WIDTH_5: |
817 | case NL80211_CHAN_WIDTH_10: |
818 | if (params.chandef.width != ifibss->chandef.width) { |
819 | sdata_info(sdata, |
820 | "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n" , |
821 | ifibss->bssid, |
822 | params.chandef.chan->center_freq, |
823 | params.chandef.width, |
824 | params.chandef.center_freq1, |
825 | params.chandef.center_freq2); |
826 | goto disconnect; |
827 | } |
828 | break; |
829 | default: |
830 | /* should not happen, conn_flags should prevent VHT modes. */ |
831 | WARN_ON(1); |
832 | goto disconnect; |
833 | } |
834 | |
835 | if (!cfg80211_reg_can_beacon(wiphy: sdata->local->hw.wiphy, chandef: ¶ms.chandef, |
836 | iftype: NL80211_IFTYPE_ADHOC)) { |
837 | sdata_info(sdata, |
838 | "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n" , |
839 | ifibss->bssid, |
840 | params.chandef.chan->center_freq, |
841 | params.chandef.width, |
842 | params.chandef.center_freq1, |
843 | params.chandef.center_freq2); |
844 | goto disconnect; |
845 | } |
846 | |
847 | err = cfg80211_chandef_dfs_required(wiphy: sdata->local->hw.wiphy, |
848 | chandef: ¶ms.chandef, |
849 | iftype: NL80211_IFTYPE_ADHOC); |
850 | if (err < 0) |
851 | goto disconnect; |
852 | if (err > 0 && !ifibss->userspace_handles_dfs) { |
853 | /* IBSS-DFS only allowed with a control program */ |
854 | goto disconnect; |
855 | } |
856 | |
857 | params.radar_required = err; |
858 | |
859 | if (cfg80211_chandef_identical(chandef1: ¶ms.chandef, |
860 | chandef2: &sdata->vif.bss_conf.chandef)) { |
861 | ibss_dbg(sdata, |
862 | "received csa with an identical chandef, ignoring\n" ); |
863 | return true; |
864 | } |
865 | |
866 | /* all checks done, now perform the channel switch. */ |
867 | ibss_dbg(sdata, |
868 | "received channel switch announcement to go to channel %d MHz\n" , |
869 | params.chandef.chan->center_freq); |
870 | |
871 | params.block_tx = !!csa_ie.mode; |
872 | |
873 | if (ieee80211_channel_switch(wiphy: sdata->local->hw.wiphy, dev: sdata->dev, |
874 | params: ¶ms)) |
875 | goto disconnect; |
876 | |
877 | ieee80211_ibss_csa_mark_radar(sdata); |
878 | |
879 | return true; |
880 | disconnect: |
881 | ibss_dbg(sdata, "Can't handle channel switch, disconnect\n" ); |
882 | wiphy_work_queue(wiphy: sdata->local->hw.wiphy, |
883 | work: &ifibss->csa_connection_drop_work); |
884 | |
885 | ieee80211_ibss_csa_mark_radar(sdata); |
886 | |
887 | return true; |
888 | } |
889 | |
890 | static void |
891 | ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, |
892 | struct ieee80211_mgmt *mgmt, size_t len, |
893 | struct ieee80211_rx_status *rx_status, |
894 | struct ieee802_11_elems *elems) |
895 | { |
896 | int required_len; |
897 | |
898 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) |
899 | return; |
900 | |
901 | /* CSA is the only action we handle for now */ |
902 | if (mgmt->u.action.u.measurement.action_code != |
903 | WLAN_ACTION_SPCT_CHL_SWITCH) |
904 | return; |
905 | |
906 | required_len = IEEE80211_MIN_ACTION_SIZE + |
907 | sizeof(mgmt->u.action.u.chan_switch); |
908 | if (len < required_len) |
909 | return; |
910 | |
911 | if (!sdata->vif.bss_conf.csa_active) |
912 | ieee80211_ibss_process_chanswitch(sdata, elems, beacon: false); |
913 | } |
914 | |
915 | static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, |
916 | struct ieee80211_mgmt *mgmt, |
917 | size_t len) |
918 | { |
919 | u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); |
920 | |
921 | if (len < IEEE80211_DEAUTH_FRAME_LEN) |
922 | return; |
923 | |
924 | ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n" , mgmt->sa, mgmt->da); |
925 | ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n" , mgmt->bssid, reason); |
926 | sta_info_destroy_addr(sdata, addr: mgmt->sa); |
927 | } |
928 | |
929 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, |
930 | struct ieee80211_mgmt *mgmt, |
931 | size_t len) |
932 | { |
933 | u16 auth_alg, auth_transaction; |
934 | |
935 | lockdep_assert_wiphy(sdata->local->hw.wiphy); |
936 | |
937 | if (len < 24 + 6) |
938 | return; |
939 | |
940 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); |
941 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); |
942 | |
943 | ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n" , mgmt->sa, mgmt->da); |
944 | ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n" , |
945 | mgmt->bssid, auth_transaction); |
946 | |
947 | if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) |
948 | return; |
949 | |
950 | /* |
951 | * IEEE 802.11 standard does not require authentication in IBSS |
952 | * networks and most implementations do not seem to use it. |
953 | * However, try to reply to authentication attempts if someone |
954 | * has actually implemented this. |
955 | */ |
956 | ieee80211_send_auth(sdata, transaction: 2, WLAN_AUTH_OPEN, status: 0, NULL, extra_len: 0, |
957 | bssid: mgmt->sa, da: sdata->u.ibss.bssid, NULL, key_len: 0, key_idx: 0, tx_flags: 0); |
958 | } |
959 | |
960 | static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata, |
961 | struct ieee80211_mgmt *mgmt, size_t len, |
962 | struct ieee80211_rx_status *rx_status, |
963 | struct ieee802_11_elems *elems, |
964 | struct ieee80211_channel *channel) |
965 | { |
966 | struct sta_info *sta; |
967 | enum nl80211_band band = rx_status->band; |
968 | struct ieee80211_local *local = sdata->local; |
969 | struct ieee80211_supported_band *sband; |
970 | bool rates_updated = false; |
971 | u32 supp_rates = 0; |
972 | |
973 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
974 | return; |
975 | |
976 | if (!ether_addr_equal(addr1: mgmt->bssid, addr2: sdata->u.ibss.bssid)) |
977 | return; |
978 | |
979 | sband = local->hw.wiphy->bands[band]; |
980 | if (WARN_ON(!sband)) |
981 | return; |
982 | |
983 | rcu_read_lock(); |
984 | sta = sta_info_get(sdata, addr: mgmt->sa); |
985 | |
986 | if (elems->supp_rates) { |
987 | supp_rates = ieee80211_sta_get_rates(sdata, elems, |
988 | band, NULL); |
989 | if (sta) { |
990 | u32 prev_rates; |
991 | |
992 | prev_rates = sta->sta.deflink.supp_rates[band]; |
993 | |
994 | sta->sta.deflink.supp_rates[band] = supp_rates | |
995 | ieee80211_mandatory_rates(sband); |
996 | if (sta->sta.deflink.supp_rates[band] != prev_rates) { |
997 | ibss_dbg(sdata, |
998 | "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n" , |
999 | sta->sta.addr, prev_rates, |
1000 | sta->sta.deflink.supp_rates[band]); |
1001 | rates_updated = true; |
1002 | } |
1003 | } else { |
1004 | rcu_read_unlock(); |
1005 | sta = ieee80211_ibss_add_sta(sdata, bssid: mgmt->bssid, |
1006 | addr: mgmt->sa, supp_rates); |
1007 | } |
1008 | } |
1009 | |
1010 | if (sta && !sta->sta.wme && |
1011 | (elems->wmm_info || elems->s1g_capab) && |
1012 | local->hw.queues >= IEEE80211_NUM_ACS) { |
1013 | sta->sta.wme = true; |
1014 | ieee80211_check_fast_xmit(sta); |
1015 | } |
1016 | |
1017 | if (sta && elems->ht_operation && elems->ht_cap_elem && |
1018 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && |
1019 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && |
1020 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { |
1021 | /* we both use HT */ |
1022 | struct ieee80211_ht_cap htcap_ie; |
1023 | struct cfg80211_chan_def chandef; |
1024 | enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth; |
1025 | |
1026 | cfg80211_chandef_create(chandef: &chandef, channel, chantype: NL80211_CHAN_NO_HT); |
1027 | ieee80211_chandef_ht_oper(ht_oper: elems->ht_operation, chandef: &chandef); |
1028 | |
1029 | memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); |
1030 | rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, |
1031 | ht_cap_ie: &htcap_ie, |
1032 | link_sta: &sta->deflink); |
1033 | |
1034 | if (elems->vht_operation && elems->vht_cap_elem && |
1035 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 && |
1036 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) { |
1037 | /* we both use VHT */ |
1038 | struct ieee80211_vht_cap cap_ie; |
1039 | struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap; |
1040 | u32 vht_cap_info = |
1041 | le32_to_cpu(elems->vht_cap_elem->vht_cap_info); |
1042 | |
1043 | ieee80211_chandef_vht_oper(hw: &local->hw, vht_cap_info, |
1044 | oper: elems->vht_operation, |
1045 | htop: elems->ht_operation, |
1046 | chandef: &chandef); |
1047 | memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie)); |
1048 | ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, |
1049 | vht_cap_ie: &cap_ie, NULL, |
1050 | link_sta: &sta->deflink); |
1051 | if (memcmp(p: &cap, q: &sta->sta.deflink.vht_cap, size: sizeof(cap))) |
1052 | rates_updated |= true; |
1053 | } |
1054 | |
1055 | if (bw != sta->sta.deflink.bandwidth) |
1056 | rates_updated |= true; |
1057 | |
1058 | if (!cfg80211_chandef_compatible(chandef1: &sdata->u.ibss.chandef, |
1059 | chandef2: &chandef)) |
1060 | WARN_ON_ONCE(1); |
1061 | } |
1062 | |
1063 | if (sta && rates_updated) { |
1064 | u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED; |
1065 | u8 rx_nss = sta->sta.deflink.rx_nss; |
1066 | |
1067 | /* Force rx_nss recalculation */ |
1068 | sta->sta.deflink.rx_nss = 0; |
1069 | rate_control_rate_init(sta); |
1070 | if (sta->sta.deflink.rx_nss != rx_nss) |
1071 | changed |= IEEE80211_RC_NSS_CHANGED; |
1072 | |
1073 | drv_sta_rc_update(local, sdata, sta: &sta->sta, changed); |
1074 | } |
1075 | |
1076 | rcu_read_unlock(); |
1077 | } |
1078 | |
1079 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
1080 | struct ieee80211_mgmt *mgmt, size_t len, |
1081 | struct ieee80211_rx_status *rx_status, |
1082 | struct ieee802_11_elems *elems) |
1083 | { |
1084 | struct ieee80211_local *local = sdata->local; |
1085 | struct cfg80211_bss *cbss; |
1086 | struct ieee80211_bss *bss; |
1087 | struct ieee80211_channel *channel; |
1088 | u64 beacon_timestamp, rx_timestamp; |
1089 | u32 supp_rates = 0; |
1090 | enum nl80211_band band = rx_status->band; |
1091 | |
1092 | channel = ieee80211_get_channel(wiphy: local->hw.wiphy, freq: rx_status->freq); |
1093 | if (!channel) |
1094 | return; |
1095 | |
1096 | ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel); |
1097 | |
1098 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel); |
1099 | if (!bss) |
1100 | return; |
1101 | |
1102 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
1103 | |
1104 | /* same for beacon and probe response */ |
1105 | beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); |
1106 | |
1107 | /* check if we need to merge IBSS */ |
1108 | |
1109 | /* not an IBSS */ |
1110 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
1111 | goto put_bss; |
1112 | |
1113 | /* different channel */ |
1114 | if (sdata->u.ibss.fixed_channel && |
1115 | sdata->u.ibss.chandef.chan != cbss->channel) |
1116 | goto put_bss; |
1117 | |
1118 | /* different SSID */ |
1119 | if (elems->ssid_len != sdata->u.ibss.ssid_len || |
1120 | memcmp(p: elems->ssid, q: sdata->u.ibss.ssid, |
1121 | size: sdata->u.ibss.ssid_len)) |
1122 | goto put_bss; |
1123 | |
1124 | /* process channel switch */ |
1125 | if (sdata->vif.bss_conf.csa_active || |
1126 | ieee80211_ibss_process_chanswitch(sdata, elems, beacon: true)) |
1127 | goto put_bss; |
1128 | |
1129 | /* same BSSID */ |
1130 | if (ether_addr_equal(addr1: cbss->bssid, addr2: sdata->u.ibss.bssid)) |
1131 | goto put_bss; |
1132 | |
1133 | /* we use a fixed BSSID */ |
1134 | if (sdata->u.ibss.fixed_bssid) |
1135 | goto put_bss; |
1136 | |
1137 | if (ieee80211_have_rx_timestamp(status: rx_status)) { |
1138 | /* time when timestamp field was received */ |
1139 | rx_timestamp = |
1140 | ieee80211_calculate_rx_timestamp(local, status: rx_status, |
1141 | mpdu_len: len + FCS_LEN, mpdu_offset: 24); |
1142 | } else { |
1143 | /* |
1144 | * second best option: get current TSF |
1145 | * (will return -1 if not supported) |
1146 | */ |
1147 | rx_timestamp = drv_get_tsf(local, sdata); |
1148 | } |
1149 | |
1150 | ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n" , |
1151 | mgmt->sa, mgmt->bssid, |
1152 | (unsigned long long)rx_timestamp); |
1153 | ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n" , |
1154 | (unsigned long long)beacon_timestamp, |
1155 | (unsigned long long)(rx_timestamp - beacon_timestamp), |
1156 | jiffies); |
1157 | |
1158 | if (beacon_timestamp > rx_timestamp) { |
1159 | ibss_dbg(sdata, |
1160 | "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n" , |
1161 | mgmt->bssid); |
1162 | ieee80211_sta_join_ibss(sdata, bss); |
1163 | supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); |
1164 | ieee80211_ibss_add_sta(sdata, bssid: mgmt->bssid, addr: mgmt->sa, |
1165 | supp_rates); |
1166 | rcu_read_unlock(); |
1167 | } |
1168 | |
1169 | put_bss: |
1170 | ieee80211_rx_bss_put(local, bss); |
1171 | } |
1172 | |
1173 | void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
1174 | const u8 *bssid, const u8 *addr, |
1175 | u32 supp_rates) |
1176 | { |
1177 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1178 | struct ieee80211_local *local = sdata->local; |
1179 | struct sta_info *sta; |
1180 | struct ieee80211_chanctx_conf *chanctx_conf; |
1181 | struct ieee80211_supported_band *sband; |
1182 | int band; |
1183 | |
1184 | /* |
1185 | * XXX: Consider removing the least recently used entry and |
1186 | * allow new one to be added. |
1187 | */ |
1188 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
1189 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n" , |
1190 | sdata->name, addr); |
1191 | return; |
1192 | } |
1193 | |
1194 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
1195 | return; |
1196 | |
1197 | if (!ether_addr_equal(addr1: bssid, addr2: sdata->u.ibss.bssid)) |
1198 | return; |
1199 | |
1200 | rcu_read_lock(); |
1201 | chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); |
1202 | if (WARN_ON_ONCE(!chanctx_conf)) { |
1203 | rcu_read_unlock(); |
1204 | return; |
1205 | } |
1206 | band = chanctx_conf->def.chan->band; |
1207 | rcu_read_unlock(); |
1208 | |
1209 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
1210 | if (!sta) |
1211 | return; |
1212 | |
1213 | /* make sure mandatory rates are always added */ |
1214 | sband = local->hw.wiphy->bands[band]; |
1215 | sta->sta.deflink.supp_rates[band] = supp_rates | |
1216 | ieee80211_mandatory_rates(sband); |
1217 | |
1218 | spin_lock(lock: &ifibss->incomplete_lock); |
1219 | list_add(new: &sta->list, head: &ifibss->incomplete_stations); |
1220 | spin_unlock(lock: &ifibss->incomplete_lock); |
1221 | wiphy_work_queue(wiphy: local->hw.wiphy, work: &sdata->work); |
1222 | } |
1223 | |
1224 | static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) |
1225 | { |
1226 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1227 | struct ieee80211_local *local = sdata->local; |
1228 | struct sta_info *sta, *tmp; |
1229 | unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; |
1230 | unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; |
1231 | |
1232 | lockdep_assert_wiphy(local->hw.wiphy); |
1233 | |
1234 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { |
1235 | unsigned long last_active = ieee80211_sta_last_active(sta); |
1236 | |
1237 | if (sdata != sta->sdata) |
1238 | continue; |
1239 | |
1240 | if (time_is_before_jiffies(last_active + exp_time) || |
1241 | (time_is_before_jiffies(last_active + exp_rsn) && |
1242 | sta->sta_state != IEEE80211_STA_AUTHORIZED)) { |
1243 | u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; |
1244 | |
1245 | sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n" , |
1246 | sta->sta_state != IEEE80211_STA_AUTHORIZED ? |
1247 | "not authorized " : "" , sta->sta.addr); |
1248 | |
1249 | ieee80211_send_deauth_disassoc(sdata, da: sta->sta.addr, |
1250 | bssid: ifibss->bssid, |
1251 | IEEE80211_STYPE_DEAUTH, |
1252 | reason: WLAN_REASON_DEAUTH_LEAVING, |
1253 | send_frame: true, frame_buf); |
1254 | WARN_ON(__sta_info_destroy(sta)); |
1255 | } |
1256 | } |
1257 | } |
1258 | |
1259 | /* |
1260 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED |
1261 | */ |
1262 | |
1263 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) |
1264 | { |
1265 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1266 | |
1267 | lockdep_assert_wiphy(sdata->local->hw.wiphy); |
1268 | |
1269 | mod_timer(timer: &ifibss->timer, |
1270 | expires: round_jiffies(j: jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); |
1271 | |
1272 | ieee80211_ibss_sta_expire(sdata); |
1273 | |
1274 | if (time_before(jiffies, ifibss->last_scan_completed + |
1275 | IEEE80211_IBSS_MERGE_INTERVAL)) |
1276 | return; |
1277 | |
1278 | if (ieee80211_sta_active_ibss(sdata)) |
1279 | return; |
1280 | |
1281 | if (ifibss->fixed_channel) |
1282 | return; |
1283 | |
1284 | sdata_info(sdata, |
1285 | "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n" ); |
1286 | |
1287 | ieee80211_request_ibss_scan(sdata, ssid: ifibss->ssid, ssid_len: ifibss->ssid_len, |
1288 | NULL, n_channels: 0); |
1289 | } |
1290 | |
1291 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
1292 | { |
1293 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1294 | u8 bssid[ETH_ALEN]; |
1295 | u16 capability; |
1296 | int i; |
1297 | |
1298 | lockdep_assert_wiphy(sdata->local->hw.wiphy); |
1299 | |
1300 | if (ifibss->fixed_bssid) { |
1301 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
1302 | } else { |
1303 | /* Generate random, not broadcast, locally administered BSSID. Mix in |
1304 | * own MAC address to make sure that devices that do not have proper |
1305 | * random number generator get different BSSID. */ |
1306 | get_random_bytes(buf: bssid, ETH_ALEN); |
1307 | for (i = 0; i < ETH_ALEN; i++) |
1308 | bssid[i] ^= sdata->vif.addr[i]; |
1309 | bssid[0] &= ~0x01; |
1310 | bssid[0] |= 0x02; |
1311 | } |
1312 | |
1313 | sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n" , bssid); |
1314 | |
1315 | capability = WLAN_CAPABILITY_IBSS; |
1316 | |
1317 | if (ifibss->privacy) |
1318 | capability |= WLAN_CAPABILITY_PRIVACY; |
1319 | |
1320 | __ieee80211_sta_join_ibss(sdata, bssid, beacon_int: sdata->vif.bss_conf.beacon_int, |
1321 | req_chandef: &ifibss->chandef, basic_rates: ifibss->basic_rates, |
1322 | capability, tsf: 0, creator: true); |
1323 | } |
1324 | |
1325 | static unsigned int ibss_setup_channels(struct wiphy *wiphy, |
1326 | struct ieee80211_channel **channels, |
1327 | unsigned int channels_max, |
1328 | u32 center_freq, u32 width) |
1329 | { |
1330 | struct ieee80211_channel *chan = NULL; |
1331 | unsigned int n_chan = 0; |
1332 | u32 start_freq, end_freq, freq; |
1333 | |
1334 | if (width <= 20) { |
1335 | start_freq = center_freq; |
1336 | end_freq = center_freq; |
1337 | } else { |
1338 | start_freq = center_freq - width / 2 + 10; |
1339 | end_freq = center_freq + width / 2 - 10; |
1340 | } |
1341 | |
1342 | for (freq = start_freq; freq <= end_freq; freq += 20) { |
1343 | chan = ieee80211_get_channel(wiphy, freq); |
1344 | if (!chan) |
1345 | continue; |
1346 | if (n_chan >= channels_max) |
1347 | return n_chan; |
1348 | |
1349 | channels[n_chan] = chan; |
1350 | n_chan++; |
1351 | } |
1352 | |
1353 | return n_chan; |
1354 | } |
1355 | |
1356 | static unsigned int |
1357 | ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy, |
1358 | const struct cfg80211_chan_def *chandef, |
1359 | struct ieee80211_channel **channels, |
1360 | unsigned int channels_max) |
1361 | { |
1362 | unsigned int n_chan = 0; |
1363 | u32 width, cf1, cf2 = 0; |
1364 | |
1365 | switch (chandef->width) { |
1366 | case NL80211_CHAN_WIDTH_40: |
1367 | width = 40; |
1368 | break; |
1369 | case NL80211_CHAN_WIDTH_80P80: |
1370 | cf2 = chandef->center_freq2; |
1371 | fallthrough; |
1372 | case NL80211_CHAN_WIDTH_80: |
1373 | width = 80; |
1374 | break; |
1375 | case NL80211_CHAN_WIDTH_160: |
1376 | width = 160; |
1377 | break; |
1378 | default: |
1379 | width = 20; |
1380 | break; |
1381 | } |
1382 | |
1383 | cf1 = chandef->center_freq1; |
1384 | |
1385 | n_chan = ibss_setup_channels(wiphy, channels, channels_max, center_freq: cf1, width); |
1386 | |
1387 | if (cf2) |
1388 | n_chan += ibss_setup_channels(wiphy, channels: &channels[n_chan], |
1389 | channels_max: channels_max - n_chan, center_freq: cf2, |
1390 | width); |
1391 | |
1392 | return n_chan; |
1393 | } |
1394 | |
1395 | /* |
1396 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH |
1397 | */ |
1398 | |
1399 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
1400 | { |
1401 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1402 | struct ieee80211_local *local = sdata->local; |
1403 | struct cfg80211_bss *cbss; |
1404 | struct ieee80211_channel *chan = NULL; |
1405 | const u8 *bssid = NULL; |
1406 | int active_ibss; |
1407 | |
1408 | lockdep_assert_wiphy(sdata->local->hw.wiphy); |
1409 | |
1410 | active_ibss = ieee80211_sta_active_ibss(sdata); |
1411 | ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n" , active_ibss); |
1412 | |
1413 | if (active_ibss) |
1414 | return; |
1415 | |
1416 | if (ifibss->fixed_bssid) |
1417 | bssid = ifibss->bssid; |
1418 | if (ifibss->fixed_channel) |
1419 | chan = ifibss->chandef.chan; |
1420 | if (!is_zero_ether_addr(addr: ifibss->bssid)) |
1421 | bssid = ifibss->bssid; |
1422 | cbss = cfg80211_get_bss(wiphy: local->hw.wiphy, channel: chan, bssid, |
1423 | ssid: ifibss->ssid, ssid_len: ifibss->ssid_len, |
1424 | bss_type: IEEE80211_BSS_TYPE_IBSS, |
1425 | IEEE80211_PRIVACY(ifibss->privacy)); |
1426 | |
1427 | if (cbss) { |
1428 | struct ieee80211_bss *bss; |
1429 | |
1430 | bss = (void *)cbss->priv; |
1431 | ibss_dbg(sdata, |
1432 | "sta_find_ibss: selected %pM current %pM\n" , |
1433 | cbss->bssid, ifibss->bssid); |
1434 | sdata_info(sdata, |
1435 | "Selected IBSS BSSID %pM based on configured SSID\n" , |
1436 | cbss->bssid); |
1437 | |
1438 | ieee80211_sta_join_ibss(sdata, bss); |
1439 | ieee80211_rx_bss_put(local, bss); |
1440 | return; |
1441 | } |
1442 | |
1443 | /* if a fixed bssid and a fixed freq have been provided create the IBSS |
1444 | * directly and do not waste time scanning |
1445 | */ |
1446 | if (ifibss->fixed_bssid && ifibss->fixed_channel) { |
1447 | sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n" , |
1448 | bssid); |
1449 | ieee80211_sta_create_ibss(sdata); |
1450 | return; |
1451 | } |
1452 | |
1453 | |
1454 | ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n" ); |
1455 | |
1456 | /* Selected IBSS not found in current scan results - try to scan */ |
1457 | if (time_after(jiffies, ifibss->last_scan_completed + |
1458 | IEEE80211_SCAN_INTERVAL)) { |
1459 | struct ieee80211_channel *channels[8]; |
1460 | unsigned int num; |
1461 | |
1462 | sdata_info(sdata, "Trigger new scan to find an IBSS to join\n" ); |
1463 | |
1464 | if (ifibss->fixed_channel) { |
1465 | num = ieee80211_ibss_setup_scan_channels(wiphy: local->hw.wiphy, |
1466 | chandef: &ifibss->chandef, |
1467 | channels, |
1468 | ARRAY_SIZE(channels)); |
1469 | ieee80211_request_ibss_scan(sdata, ssid: ifibss->ssid, |
1470 | ssid_len: ifibss->ssid_len, channels, |
1471 | n_channels: num); |
1472 | } else { |
1473 | ieee80211_request_ibss_scan(sdata, ssid: ifibss->ssid, |
1474 | ssid_len: ifibss->ssid_len, NULL, n_channels: 0); |
1475 | } |
1476 | } else { |
1477 | int interval = IEEE80211_SCAN_INTERVAL; |
1478 | |
1479 | if (time_after(jiffies, ifibss->ibss_join_req + |
1480 | IEEE80211_IBSS_JOIN_TIMEOUT)) |
1481 | ieee80211_sta_create_ibss(sdata); |
1482 | |
1483 | mod_timer(timer: &ifibss->timer, |
1484 | expires: round_jiffies(j: jiffies + interval)); |
1485 | } |
1486 | } |
1487 | |
1488 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, |
1489 | struct sk_buff *req) |
1490 | { |
1491 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
1492 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1493 | struct ieee80211_local *local = sdata->local; |
1494 | int tx_last_beacon, len = req->len; |
1495 | struct sk_buff *skb; |
1496 | struct beacon_data *presp; |
1497 | u8 *pos, *end; |
1498 | |
1499 | lockdep_assert_wiphy(sdata->local->hw.wiphy); |
1500 | |
1501 | presp = sdata_dereference(ifibss->presp, sdata); |
1502 | |
1503 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
1504 | len < 24 + 2 || !presp) |
1505 | return; |
1506 | |
1507 | tx_last_beacon = drv_tx_last_beacon(local); |
1508 | |
1509 | ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n" , mgmt->sa, mgmt->da); |
1510 | ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n" , |
1511 | mgmt->bssid, tx_last_beacon); |
1512 | |
1513 | if (!tx_last_beacon && is_multicast_ether_addr(addr: mgmt->da)) |
1514 | return; |
1515 | |
1516 | if (!ether_addr_equal(addr1: mgmt->bssid, addr2: ifibss->bssid) && |
1517 | !is_broadcast_ether_addr(addr: mgmt->bssid)) |
1518 | return; |
1519 | |
1520 | end = ((u8 *) mgmt) + len; |
1521 | pos = mgmt->u.probe_req.variable; |
1522 | if (pos[0] != WLAN_EID_SSID || |
1523 | pos + 2 + pos[1] > end) { |
1524 | ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n" , |
1525 | mgmt->sa); |
1526 | return; |
1527 | } |
1528 | if (pos[1] != 0 && |
1529 | (pos[1] != ifibss->ssid_len || |
1530 | memcmp(p: pos + 2, q: ifibss->ssid, size: ifibss->ssid_len))) { |
1531 | /* Ignore ProbeReq for foreign SSID */ |
1532 | return; |
1533 | } |
1534 | |
1535 | /* Reply with ProbeResp */ |
1536 | skb = dev_alloc_skb(length: local->tx_headroom + presp->head_len); |
1537 | if (!skb) |
1538 | return; |
1539 | |
1540 | skb_reserve(skb, len: local->tx_headroom); |
1541 | skb_put_data(skb, data: presp->head, len: presp->head_len); |
1542 | |
1543 | memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); |
1544 | ibss_dbg(sdata, "Sending ProbeResp to %pM\n" , mgmt->sa); |
1545 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
1546 | |
1547 | /* avoid excessive retries for probe request to wildcard SSIDs */ |
1548 | if (pos[1] == 0) |
1549 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; |
1550 | |
1551 | ieee80211_tx_skb(sdata, skb); |
1552 | } |
1553 | |
1554 | static |
1555 | void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, |
1556 | struct ieee80211_mgmt *mgmt, size_t len, |
1557 | struct ieee80211_rx_status *rx_status) |
1558 | { |
1559 | size_t baselen; |
1560 | struct ieee802_11_elems *elems; |
1561 | |
1562 | BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != |
1563 | offsetof(typeof(mgmt->u.beacon), variable)); |
1564 | |
1565 | /* |
1566 | * either beacon or probe_resp but the variable field is at the |
1567 | * same offset |
1568 | */ |
1569 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
1570 | if (baselen > len) |
1571 | return; |
1572 | |
1573 | elems = ieee802_11_parse_elems(start: mgmt->u.probe_resp.variable, |
1574 | len: len - baselen, action: false, NULL); |
1575 | |
1576 | if (elems) { |
1577 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems); |
1578 | kfree(objp: elems); |
1579 | } |
1580 | } |
1581 | |
1582 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
1583 | struct sk_buff *skb) |
1584 | { |
1585 | struct ieee80211_rx_status *rx_status; |
1586 | struct ieee80211_mgmt *mgmt; |
1587 | u16 fc; |
1588 | struct ieee802_11_elems *elems; |
1589 | int ies_len; |
1590 | |
1591 | rx_status = IEEE80211_SKB_RXCB(skb); |
1592 | mgmt = (struct ieee80211_mgmt *) skb->data; |
1593 | fc = le16_to_cpu(mgmt->frame_control); |
1594 | |
1595 | if (!sdata->u.ibss.ssid_len) |
1596 | return; /* not ready to merge yet */ |
1597 | |
1598 | switch (fc & IEEE80211_FCTL_STYPE) { |
1599 | case IEEE80211_STYPE_PROBE_REQ: |
1600 | ieee80211_rx_mgmt_probe_req(sdata, req: skb); |
1601 | break; |
1602 | case IEEE80211_STYPE_PROBE_RESP: |
1603 | case IEEE80211_STYPE_BEACON: |
1604 | ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, len: skb->len, |
1605 | rx_status); |
1606 | break; |
1607 | case IEEE80211_STYPE_AUTH: |
1608 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, len: skb->len); |
1609 | break; |
1610 | case IEEE80211_STYPE_DEAUTH: |
1611 | ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, len: skb->len); |
1612 | break; |
1613 | case IEEE80211_STYPE_ACTION: |
1614 | switch (mgmt->u.action.category) { |
1615 | case WLAN_CATEGORY_SPECTRUM_MGMT: |
1616 | ies_len = skb->len - |
1617 | offsetof(struct ieee80211_mgmt, |
1618 | u.action.u.chan_switch.variable); |
1619 | |
1620 | if (ies_len < 0) |
1621 | break; |
1622 | |
1623 | elems = ieee802_11_parse_elems( |
1624 | start: mgmt->u.action.u.chan_switch.variable, |
1625 | len: ies_len, action: true, NULL); |
1626 | |
1627 | if (elems && !elems->parse_error) |
1628 | ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, |
1629 | len: skb->len, |
1630 | rx_status, |
1631 | elems); |
1632 | kfree(objp: elems); |
1633 | break; |
1634 | } |
1635 | } |
1636 | } |
1637 | |
1638 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
1639 | { |
1640 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1641 | struct sta_info *sta; |
1642 | |
1643 | /* |
1644 | * Work could be scheduled after scan or similar |
1645 | * when we aren't even joined (or trying) with a |
1646 | * network. |
1647 | */ |
1648 | if (!ifibss->ssid_len) |
1649 | return; |
1650 | |
1651 | spin_lock_bh(lock: &ifibss->incomplete_lock); |
1652 | while (!list_empty(head: &ifibss->incomplete_stations)) { |
1653 | sta = list_first_entry(&ifibss->incomplete_stations, |
1654 | struct sta_info, list); |
1655 | list_del(entry: &sta->list); |
1656 | spin_unlock_bh(lock: &ifibss->incomplete_lock); |
1657 | |
1658 | ieee80211_ibss_finish_sta(sta); |
1659 | rcu_read_unlock(); |
1660 | spin_lock_bh(lock: &ifibss->incomplete_lock); |
1661 | } |
1662 | spin_unlock_bh(lock: &ifibss->incomplete_lock); |
1663 | |
1664 | switch (ifibss->state) { |
1665 | case IEEE80211_IBSS_MLME_SEARCH: |
1666 | ieee80211_sta_find_ibss(sdata); |
1667 | break; |
1668 | case IEEE80211_IBSS_MLME_JOINED: |
1669 | ieee80211_sta_merge_ibss(sdata); |
1670 | break; |
1671 | default: |
1672 | WARN_ON(1); |
1673 | break; |
1674 | } |
1675 | } |
1676 | |
1677 | static void ieee80211_ibss_timer(struct timer_list *t) |
1678 | { |
1679 | struct ieee80211_sub_if_data *sdata = |
1680 | from_timer(sdata, t, u.ibss.timer); |
1681 | |
1682 | wiphy_work_queue(wiphy: sdata->local->hw.wiphy, work: &sdata->work); |
1683 | } |
1684 | |
1685 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
1686 | { |
1687 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1688 | |
1689 | timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0); |
1690 | INIT_LIST_HEAD(list: &ifibss->incomplete_stations); |
1691 | spin_lock_init(&ifibss->incomplete_lock); |
1692 | wiphy_work_init(work: &ifibss->csa_connection_drop_work, |
1693 | func: ieee80211_csa_connection_drop_work); |
1694 | } |
1695 | |
1696 | /* scan finished notification */ |
1697 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) |
1698 | { |
1699 | struct ieee80211_sub_if_data *sdata; |
1700 | |
1701 | lockdep_assert_wiphy(local->hw.wiphy); |
1702 | |
1703 | list_for_each_entry(sdata, &local->interfaces, list) { |
1704 | if (!ieee80211_sdata_running(sdata)) |
1705 | continue; |
1706 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
1707 | continue; |
1708 | sdata->u.ibss.last_scan_completed = jiffies; |
1709 | } |
1710 | } |
1711 | |
1712 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
1713 | struct cfg80211_ibss_params *params) |
1714 | { |
1715 | u64 changed = 0; |
1716 | u32 rate_flags; |
1717 | struct ieee80211_supported_band *sband; |
1718 | enum ieee80211_chanctx_mode chanmode; |
1719 | struct ieee80211_local *local = sdata->local; |
1720 | int radar_detect_width = 0; |
1721 | int i; |
1722 | int ret; |
1723 | |
1724 | lockdep_assert_wiphy(local->hw.wiphy); |
1725 | |
1726 | if (params->chandef.chan->freq_offset) { |
1727 | /* this may work, but is untested */ |
1728 | return -EOPNOTSUPP; |
1729 | } |
1730 | |
1731 | ret = cfg80211_chandef_dfs_required(wiphy: local->hw.wiphy, |
1732 | chandef: ¶ms->chandef, |
1733 | iftype: sdata->wdev.iftype); |
1734 | if (ret < 0) |
1735 | return ret; |
1736 | |
1737 | if (ret > 0) { |
1738 | if (!params->userspace_handles_dfs) |
1739 | return -EINVAL; |
1740 | radar_detect_width = BIT(params->chandef.width); |
1741 | } |
1742 | |
1743 | chanmode = (params->channel_fixed && !ret) ? |
1744 | IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; |
1745 | |
1746 | ret = ieee80211_check_combinations(sdata, chandef: ¶ms->chandef, chanmode, |
1747 | radar_detect: radar_detect_width); |
1748 | if (ret < 0) |
1749 | return ret; |
1750 | |
1751 | if (params->bssid) { |
1752 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); |
1753 | sdata->u.ibss.fixed_bssid = true; |
1754 | } else |
1755 | sdata->u.ibss.fixed_bssid = false; |
1756 | |
1757 | sdata->u.ibss.privacy = params->privacy; |
1758 | sdata->u.ibss.control_port = params->control_port; |
1759 | sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; |
1760 | sdata->u.ibss.basic_rates = params->basic_rates; |
1761 | sdata->u.ibss.last_scan_completed = jiffies; |
1762 | |
1763 | /* fix basic_rates if channel does not support these rates */ |
1764 | rate_flags = ieee80211_chandef_rate_flags(chandef: ¶ms->chandef); |
1765 | sband = local->hw.wiphy->bands[params->chandef.chan->band]; |
1766 | for (i = 0; i < sband->n_bitrates; i++) { |
1767 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) |
1768 | sdata->u.ibss.basic_rates &= ~BIT(i); |
1769 | } |
1770 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
1771 | sizeof(params->mcast_rate)); |
1772 | |
1773 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
1774 | |
1775 | sdata->u.ibss.chandef = params->chandef; |
1776 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
1777 | |
1778 | if (params->ie) { |
1779 | sdata->u.ibss.ie = kmemdup(p: params->ie, size: params->ie_len, |
1780 | GFP_KERNEL); |
1781 | if (sdata->u.ibss.ie) |
1782 | sdata->u.ibss.ie_len = params->ie_len; |
1783 | } |
1784 | |
1785 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
1786 | sdata->u.ibss.ibss_join_req = jiffies; |
1787 | |
1788 | memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); |
1789 | sdata->u.ibss.ssid_len = params->ssid_len; |
1790 | |
1791 | memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, |
1792 | sizeof(sdata->u.ibss.ht_capa)); |
1793 | memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, |
1794 | sizeof(sdata->u.ibss.ht_capa_mask)); |
1795 | |
1796 | /* |
1797 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is |
1798 | * reserved, but an HT STA shall protect HT transmissions as though |
1799 | * the HT Protection field were set to non-HT mixed mode. |
1800 | * |
1801 | * In an IBSS, the RIFS Mode field of the HT Operation element is |
1802 | * also reserved, but an HT STA shall operate as though this field |
1803 | * were set to 1. |
1804 | */ |
1805 | |
1806 | sdata->vif.bss_conf.ht_operation_mode |= |
1807 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1808 | | IEEE80211_HT_PARAM_RIFS_MODE; |
1809 | |
1810 | changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE; |
1811 | ieee80211_link_info_change_notify(sdata, link: &sdata->deflink, changed); |
1812 | |
1813 | sdata->deflink.smps_mode = IEEE80211_SMPS_OFF; |
1814 | sdata->deflink.needed_rx_chains = local->rx_chains; |
1815 | sdata->control_port_over_nl80211 = params->control_port_over_nl80211; |
1816 | |
1817 | wiphy_work_queue(wiphy: local->hw.wiphy, work: &sdata->work); |
1818 | |
1819 | return 0; |
1820 | } |
1821 | |
1822 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) |
1823 | { |
1824 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1825 | |
1826 | ieee80211_ibss_disconnect(sdata); |
1827 | ifibss->ssid_len = 0; |
1828 | eth_zero_addr(addr: ifibss->bssid); |
1829 | |
1830 | /* remove beacon */ |
1831 | kfree(objp: sdata->u.ibss.ie); |
1832 | sdata->u.ibss.ie = NULL; |
1833 | sdata->u.ibss.ie_len = 0; |
1834 | |
1835 | /* on the next join, re-program HT parameters */ |
1836 | memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); |
1837 | memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); |
1838 | |
1839 | synchronize_rcu(); |
1840 | |
1841 | skb_queue_purge(list: &sdata->skb_queue); |
1842 | |
1843 | del_timer_sync(timer: &sdata->u.ibss.timer); |
1844 | |
1845 | return 0; |
1846 | } |
1847 | |