xref: /openbmc/linux/net/mac80211/tdls.c (revision 05995d05)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * mac80211 TDLS handling code
4  *
5  * Copyright 2006-2010	Johannes Berg <johannes@sipsolutions.net>
6  * Copyright 2014, Intel Corporation
7  * Copyright 2014  Intel Mobile Communications GmbH
8  * Copyright 2015 - 2016 Intel Deutschland GmbH
9  * Copyright (C) 2019, 2021-2023 Intel Corporation
10  */
11 
12 #include <linux/ieee80211.h>
13 #include <linux/log2.h>
14 #include <net/cfg80211.h>
15 #include <linux/rtnetlink.h>
16 #include "ieee80211_i.h"
17 #include "driver-ops.h"
18 #include "rate.h"
19 #include "wme.h"
20 
21 /* give usermode some time for retries in setting up the TDLS session */
22 #define TDLS_PEER_SETUP_TIMEOUT	(15 * HZ)
23 
ieee80211_tdls_peer_del_work(struct work_struct * wk)24 void ieee80211_tdls_peer_del_work(struct work_struct *wk)
25 {
26 	struct ieee80211_sub_if_data *sdata;
27 	struct ieee80211_local *local;
28 
29 	sdata = container_of(wk, struct ieee80211_sub_if_data,
30 			     u.mgd.tdls_peer_del_work.work);
31 	local = sdata->local;
32 
33 	mutex_lock(&local->mtx);
34 	if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
35 		tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
36 		sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
37 		eth_zero_addr(sdata->u.mgd.tdls_peer);
38 	}
39 	mutex_unlock(&local->mtx);
40 }
41 
ieee80211_tdls_add_ext_capab(struct ieee80211_link_data * link,struct sk_buff * skb)42 static void ieee80211_tdls_add_ext_capab(struct ieee80211_link_data *link,
43 					 struct sk_buff *skb)
44 {
45 	struct ieee80211_sub_if_data *sdata = link->sdata;
46 	struct ieee80211_local *local = sdata->local;
47 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
48 	bool chan_switch = local->hw.wiphy->features &
49 			   NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
50 	bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
51 			  !ifmgd->tdls_wider_bw_prohibited;
52 	bool buffer_sta = ieee80211_hw_check(&local->hw,
53 					     SUPPORTS_TDLS_BUFFER_STA);
54 	struct ieee80211_supported_band *sband = ieee80211_get_link_sband(link);
55 	bool vht = sband && sband->vht_cap.vht_supported;
56 	u8 *pos = skb_put(skb, 10);
57 
58 	*pos++ = WLAN_EID_EXT_CAPABILITY;
59 	*pos++ = 8; /* len */
60 	*pos++ = 0x0;
61 	*pos++ = 0x0;
62 	*pos++ = 0x0;
63 	*pos++ = (chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0) |
64 		 (buffer_sta ? WLAN_EXT_CAPA4_TDLS_BUFFER_STA : 0);
65 	*pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
66 	*pos++ = 0;
67 	*pos++ = 0;
68 	*pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
69 }
70 
71 static u8
ieee80211_tdls_add_subband(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u16 start,u16 end,u16 spacing)72 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
73 			   struct sk_buff *skb, u16 start, u16 end,
74 			   u16 spacing)
75 {
76 	u8 subband_cnt = 0, ch_cnt = 0;
77 	struct ieee80211_channel *ch;
78 	struct cfg80211_chan_def chandef;
79 	int i, subband_start;
80 	struct wiphy *wiphy = sdata->local->hw.wiphy;
81 
82 	for (i = start; i <= end; i += spacing) {
83 		if (!ch_cnt)
84 			subband_start = i;
85 
86 		ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
87 		if (ch) {
88 			/* we will be active on the channel */
89 			cfg80211_chandef_create(&chandef, ch,
90 						NL80211_CHAN_NO_HT);
91 			if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
92 							  sdata->wdev.iftype)) {
93 				ch_cnt++;
94 				/*
95 				 * check if the next channel is also part of
96 				 * this allowed range
97 				 */
98 				continue;
99 			}
100 		}
101 
102 		/*
103 		 * we've reached the end of a range, with allowed channels
104 		 * found
105 		 */
106 		if (ch_cnt) {
107 			u8 *pos = skb_put(skb, 2);
108 			*pos++ = ieee80211_frequency_to_channel(subband_start);
109 			*pos++ = ch_cnt;
110 
111 			subband_cnt++;
112 			ch_cnt = 0;
113 		}
114 	}
115 
116 	/* all channels in the requested range are allowed - add them here */
117 	if (ch_cnt) {
118 		u8 *pos = skb_put(skb, 2);
119 		*pos++ = ieee80211_frequency_to_channel(subband_start);
120 		*pos++ = ch_cnt;
121 
122 		subband_cnt++;
123 	}
124 
125 	return subband_cnt;
126 }
127 
128 static void
ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)129 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
130 				 struct sk_buff *skb)
131 {
132 	/*
133 	 * Add possible channels for TDLS. These are channels that are allowed
134 	 * to be active.
135 	 */
136 	u8 subband_cnt;
137 	u8 *pos = skb_put(skb, 2);
138 
139 	*pos++ = WLAN_EID_SUPPORTED_CHANNELS;
140 
141 	/*
142 	 * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
143 	 * this doesn't happen in real world scenarios.
144 	 */
145 
146 	/* 2GHz, with 5MHz spacing */
147 	subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
148 
149 	/* 5GHz, with 20MHz spacing */
150 	subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
151 
152 	/* length */
153 	*pos = 2 * subband_cnt;
154 }
155 
ieee80211_tdls_add_oper_classes(struct ieee80211_link_data * link,struct sk_buff * skb)156 static void ieee80211_tdls_add_oper_classes(struct ieee80211_link_data *link,
157 					    struct sk_buff *skb)
158 {
159 	u8 *pos;
160 	u8 op_class;
161 
162 	if (!ieee80211_chandef_to_operating_class(&link->conf->chandef,
163 						  &op_class))
164 		return;
165 
166 	pos = skb_put(skb, 4);
167 	*pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
168 	*pos++ = 2; /* len */
169 
170 	*pos++ = op_class;
171 	*pos++ = op_class; /* give current operating class as alternate too */
172 }
173 
ieee80211_tdls_add_bss_coex_ie(struct sk_buff * skb)174 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
175 {
176 	u8 *pos = skb_put(skb, 3);
177 
178 	*pos++ = WLAN_EID_BSS_COEX_2040;
179 	*pos++ = 1; /* len */
180 
181 	*pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
182 }
183 
ieee80211_get_tdls_sta_capab(struct ieee80211_link_data * link,u16 status_code)184 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_link_data *link,
185 					u16 status_code)
186 {
187 	struct ieee80211_supported_band *sband;
188 
189 	/* The capability will be 0 when sending a failure code */
190 	if (status_code != 0)
191 		return 0;
192 
193 	sband = ieee80211_get_link_sband(link);
194 
195 	if (sband && sband->band == NL80211_BAND_2GHZ) {
196 		return WLAN_CAPABILITY_SHORT_SLOT_TIME |
197 		       WLAN_CAPABILITY_SHORT_PREAMBLE;
198 	}
199 
200 	return 0;
201 }
202 
ieee80211_tdls_add_link_ie(struct ieee80211_link_data * link,struct sk_buff * skb,const u8 * peer,bool initiator)203 static void ieee80211_tdls_add_link_ie(struct ieee80211_link_data *link,
204 				       struct sk_buff *skb, const u8 *peer,
205 				       bool initiator)
206 {
207 	struct ieee80211_sub_if_data *sdata = link->sdata;
208 	struct ieee80211_tdls_lnkie *lnkid;
209 	const u8 *init_addr, *rsp_addr;
210 
211 	if (initiator) {
212 		init_addr = sdata->vif.addr;
213 		rsp_addr = peer;
214 	} else {
215 		init_addr = peer;
216 		rsp_addr = sdata->vif.addr;
217 	}
218 
219 	lnkid = skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
220 
221 	lnkid->ie_type = WLAN_EID_LINK_ID;
222 	lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
223 
224 	memcpy(lnkid->bssid, link->u.mgd.bssid, ETH_ALEN);
225 	memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
226 	memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
227 }
228 
229 static void
ieee80211_tdls_add_aid(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)230 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
231 {
232 	u8 *pos = skb_put(skb, 4);
233 
234 	*pos++ = WLAN_EID_AID;
235 	*pos++ = 2; /* len */
236 	put_unaligned_le16(sdata->vif.cfg.aid, pos);
237 }
238 
239 /* translate numbering in the WMM parameter IE to the mac80211 notation */
ieee80211_ac_from_wmm(int ac)240 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
241 {
242 	switch (ac) {
243 	default:
244 		WARN_ON_ONCE(1);
245 		fallthrough;
246 	case 0:
247 		return IEEE80211_AC_BE;
248 	case 1:
249 		return IEEE80211_AC_BK;
250 	case 2:
251 		return IEEE80211_AC_VI;
252 	case 3:
253 		return IEEE80211_AC_VO;
254 	}
255 }
256 
ieee80211_wmm_aci_aifsn(int aifsn,bool acm,int aci)257 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
258 {
259 	u8 ret;
260 
261 	ret = aifsn & 0x0f;
262 	if (acm)
263 		ret |= 0x10;
264 	ret |= (aci << 5) & 0x60;
265 	return ret;
266 }
267 
ieee80211_wmm_ecw(u16 cw_min,u16 cw_max)268 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
269 {
270 	return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
271 	       ((ilog2(cw_max + 1) << 0x4) & 0xf0);
272 }
273 
ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)274 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
275 					    struct sk_buff *skb)
276 {
277 	struct ieee80211_wmm_param_ie *wmm;
278 	struct ieee80211_tx_queue_params *txq;
279 	int i;
280 
281 	wmm = skb_put_zero(skb, sizeof(*wmm));
282 
283 	wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
284 	wmm->len = sizeof(*wmm) - 2;
285 
286 	wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
287 	wmm->oui[1] = 0x50;
288 	wmm->oui[2] = 0xf2;
289 	wmm->oui_type = 2; /* WME */
290 	wmm->oui_subtype = 1; /* WME param */
291 	wmm->version = 1; /* WME ver */
292 	wmm->qos_info = 0; /* U-APSD not in use */
293 
294 	/*
295 	 * Use the EDCA parameters defined for the BSS, or default if the AP
296 	 * doesn't support it, as mandated by 802.11-2012 section 10.22.4
297 	 */
298 	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
299 		txq = &sdata->deflink.tx_conf[ieee80211_ac_from_wmm(i)];
300 		wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
301 							       txq->acm, i);
302 		wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
303 		wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
304 	}
305 }
306 
307 static void
ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data * sdata,struct sta_info * sta)308 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
309 				   struct sta_info *sta)
310 {
311 	/* IEEE802.11ac-2013 Table E-4 */
312 	u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
313 	struct cfg80211_chan_def uc = sta->tdls_chandef;
314 	enum nl80211_chan_width max_width =
315 		ieee80211_sta_cap_chan_bw(&sta->deflink);
316 	int i;
317 
318 	/* only support upgrading non-narrow channels up to 80Mhz */
319 	if (max_width == NL80211_CHAN_WIDTH_5 ||
320 	    max_width == NL80211_CHAN_WIDTH_10)
321 		return;
322 
323 	if (max_width > NL80211_CHAN_WIDTH_80)
324 		max_width = NL80211_CHAN_WIDTH_80;
325 
326 	if (uc.width >= max_width)
327 		return;
328 	/*
329 	 * Channel usage constrains in the IEEE802.11ac-2013 specification only
330 	 * allow expanding a 20MHz channel to 80MHz in a single way. In
331 	 * addition, there are no 40MHz allowed channels that are not part of
332 	 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
333 	 */
334 	for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
335 		if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
336 			uc.center_freq1 = centers_80mhz[i];
337 			uc.center_freq2 = 0;
338 			uc.width = NL80211_CHAN_WIDTH_80;
339 			break;
340 		}
341 
342 	if (!uc.center_freq1)
343 		return;
344 
345 	/* proceed to downgrade the chandef until usable or the same as AP BW */
346 	while (uc.width > max_width ||
347 	       (uc.width > sta->tdls_chandef.width &&
348 		!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
349 					       sdata->wdev.iftype)))
350 		ieee80211_chandef_downgrade(&uc);
351 
352 	if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
353 		tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
354 			 sta->tdls_chandef.width, uc.width);
355 
356 		/*
357 		 * the station is not yet authorized when BW upgrade is done,
358 		 * locking is not required
359 		 */
360 		sta->tdls_chandef = uc;
361 	}
362 }
363 
364 static void
ieee80211_tdls_add_setup_start_ies(struct ieee80211_link_data * link,struct sk_buff * skb,const u8 * peer,u8 action_code,bool initiator,const u8 * extra_ies,size_t extra_ies_len)365 ieee80211_tdls_add_setup_start_ies(struct ieee80211_link_data *link,
366 				   struct sk_buff *skb, const u8 *peer,
367 				   u8 action_code, bool initiator,
368 				   const u8 *extra_ies, size_t extra_ies_len)
369 {
370 	struct ieee80211_sub_if_data *sdata = link->sdata;
371 	struct ieee80211_supported_band *sband;
372 	struct ieee80211_local *local = sdata->local;
373 	struct ieee80211_sta_ht_cap ht_cap;
374 	struct ieee80211_sta_vht_cap vht_cap;
375 	const struct ieee80211_sta_he_cap *he_cap;
376 	const struct ieee80211_sta_eht_cap *eht_cap;
377 	struct sta_info *sta = NULL;
378 	size_t offset = 0, noffset;
379 	u8 *pos;
380 
381 	sband = ieee80211_get_link_sband(link);
382 	if (WARN_ON_ONCE(!sband))
383 		return;
384 
385 	ieee80211_add_srates_ie(sdata, skb, false, sband->band);
386 	ieee80211_add_ext_srates_ie(sdata, skb, false, sband->band);
387 	ieee80211_tdls_add_supp_channels(sdata, skb);
388 
389 	/* add any custom IEs that go before Extended Capabilities */
390 	if (extra_ies_len) {
391 		static const u8 before_ext_cap[] = {
392 			WLAN_EID_SUPP_RATES,
393 			WLAN_EID_COUNTRY,
394 			WLAN_EID_EXT_SUPP_RATES,
395 			WLAN_EID_SUPPORTED_CHANNELS,
396 			WLAN_EID_RSN,
397 		};
398 		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
399 					     before_ext_cap,
400 					     ARRAY_SIZE(before_ext_cap),
401 					     offset);
402 		skb_put_data(skb, extra_ies + offset, noffset - offset);
403 		offset = noffset;
404 	}
405 
406 	ieee80211_tdls_add_ext_capab(link, skb);
407 
408 	/* add the QoS element if we support it */
409 	if (local->hw.queues >= IEEE80211_NUM_ACS &&
410 	    action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
411 		ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
412 
413 	/* add any custom IEs that go before HT capabilities */
414 	if (extra_ies_len) {
415 		static const u8 before_ht_cap[] = {
416 			WLAN_EID_SUPP_RATES,
417 			WLAN_EID_COUNTRY,
418 			WLAN_EID_EXT_SUPP_RATES,
419 			WLAN_EID_SUPPORTED_CHANNELS,
420 			WLAN_EID_RSN,
421 			WLAN_EID_EXT_CAPABILITY,
422 			WLAN_EID_QOS_CAPA,
423 			WLAN_EID_FAST_BSS_TRANSITION,
424 			WLAN_EID_TIMEOUT_INTERVAL,
425 			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
426 		};
427 		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
428 					     before_ht_cap,
429 					     ARRAY_SIZE(before_ht_cap),
430 					     offset);
431 		skb_put_data(skb, extra_ies + offset, noffset - offset);
432 		offset = noffset;
433 	}
434 
435 	/* we should have the peer STA if we're already responding */
436 	if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
437 		sta = sta_info_get(sdata, peer);
438 		if (WARN_ON_ONCE(!sta))
439 			return;
440 
441 		sta->tdls_chandef = link->conf->chandef;
442 	}
443 
444 	ieee80211_tdls_add_oper_classes(link, skb);
445 
446 	/*
447 	 * with TDLS we can switch channels, and HT-caps are not necessarily
448 	 * the same on all bands. The specification limits the setup to a
449 	 * single HT-cap, so use the current band for now.
450 	 */
451 	memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
452 
453 	if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
454 	     action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
455 	    ht_cap.ht_supported) {
456 		ieee80211_apply_htcap_overrides(sdata, &ht_cap);
457 
458 		/* disable SMPS in TDLS initiator */
459 		ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
460 				<< IEEE80211_HT_CAP_SM_PS_SHIFT;
461 
462 		pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
463 		ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
464 	} else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
465 		   ht_cap.ht_supported && sta->sta.deflink.ht_cap.ht_supported) {
466 		/* the peer caps are already intersected with our own */
467 		memcpy(&ht_cap, &sta->sta.deflink.ht_cap, sizeof(ht_cap));
468 
469 		pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
470 		ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
471 	}
472 
473 	if (ht_cap.ht_supported &&
474 	    (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
475 		ieee80211_tdls_add_bss_coex_ie(skb);
476 
477 	ieee80211_tdls_add_link_ie(link, skb, peer, initiator);
478 
479 	/* add any custom IEs that go before VHT capabilities */
480 	if (extra_ies_len) {
481 		static const u8 before_vht_cap[] = {
482 			WLAN_EID_SUPP_RATES,
483 			WLAN_EID_COUNTRY,
484 			WLAN_EID_EXT_SUPP_RATES,
485 			WLAN_EID_SUPPORTED_CHANNELS,
486 			WLAN_EID_RSN,
487 			WLAN_EID_EXT_CAPABILITY,
488 			WLAN_EID_QOS_CAPA,
489 			WLAN_EID_FAST_BSS_TRANSITION,
490 			WLAN_EID_TIMEOUT_INTERVAL,
491 			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
492 			WLAN_EID_MULTI_BAND,
493 		};
494 		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
495 					     before_vht_cap,
496 					     ARRAY_SIZE(before_vht_cap),
497 					     offset);
498 		skb_put_data(skb, extra_ies + offset, noffset - offset);
499 		offset = noffset;
500 	}
501 
502 	/* add AID if VHT, HE or EHT capabilities supported */
503 	memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
504 	he_cap = ieee80211_get_he_iftype_cap_vif(sband, &sdata->vif);
505 	eht_cap = ieee80211_get_eht_iftype_cap_vif(sband, &sdata->vif);
506 	if ((vht_cap.vht_supported || he_cap || eht_cap) &&
507 	    (action_code == WLAN_TDLS_SETUP_REQUEST ||
508 	     action_code == WLAN_TDLS_SETUP_RESPONSE))
509 		ieee80211_tdls_add_aid(sdata, skb);
510 
511 	/* build the VHT-cap similarly to the HT-cap */
512 	if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
513 	     action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
514 	    vht_cap.vht_supported) {
515 		ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
516 
517 		pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
518 		ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
519 	} else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
520 		   vht_cap.vht_supported && sta->sta.deflink.vht_cap.vht_supported) {
521 		/* the peer caps are already intersected with our own */
522 		memcpy(&vht_cap, &sta->sta.deflink.vht_cap, sizeof(vht_cap));
523 
524 		pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
525 		ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
526 
527 		/*
528 		 * if both peers support WIDER_BW, we can expand the chandef to
529 		 * a wider compatible one, up to 80MHz
530 		 */
531 		if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
532 			ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
533 	}
534 
535 	/* add any custom IEs that go before HE capabilities */
536 	if (extra_ies_len) {
537 		static const u8 before_he_cap[] = {
538 			WLAN_EID_EXTENSION,
539 			WLAN_EID_EXT_FILS_REQ_PARAMS,
540 			WLAN_EID_AP_CSN,
541 		};
542 		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
543 					     before_he_cap,
544 					     ARRAY_SIZE(before_he_cap),
545 					     offset);
546 		skb_put_data(skb, extra_ies + offset, noffset - offset);
547 		offset = noffset;
548 	}
549 
550 	/* build the HE-cap from sband */
551 	if (he_cap &&
552 	    (action_code == WLAN_TDLS_SETUP_REQUEST ||
553 	     action_code == WLAN_TDLS_SETUP_RESPONSE ||
554 	     action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES)) {
555 		__le16 he_6ghz_capa;
556 		u8 cap_size;
557 
558 		cap_size =
559 			2 + 1 + sizeof(he_cap->he_cap_elem) +
560 			ieee80211_he_mcs_nss_size(&he_cap->he_cap_elem) +
561 			ieee80211_he_ppe_size(he_cap->ppe_thres[0],
562 					      he_cap->he_cap_elem.phy_cap_info);
563 		pos = skb_put(skb, cap_size);
564 		pos = ieee80211_ie_build_he_cap(0, pos, he_cap, pos + cap_size);
565 
566 		/* Build HE 6Ghz capa IE from sband */
567 		if (sband->band == NL80211_BAND_6GHZ) {
568 			cap_size = 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa);
569 			pos = skb_put(skb, cap_size);
570 			he_6ghz_capa =
571 				ieee80211_get_he_6ghz_capa_vif(sband, &sdata->vif);
572 			pos = ieee80211_write_he_6ghz_cap(pos, he_6ghz_capa,
573 							  pos + cap_size);
574 		}
575 	}
576 
577 	/* add any custom IEs that go before EHT capabilities */
578 	if (extra_ies_len) {
579 		static const u8 before_he_cap[] = {
580 			WLAN_EID_EXTENSION,
581 			WLAN_EID_EXT_FILS_REQ_PARAMS,
582 			WLAN_EID_AP_CSN,
583 		};
584 
585 		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
586 					     before_he_cap,
587 					     ARRAY_SIZE(before_he_cap),
588 					     offset);
589 		skb_put_data(skb, extra_ies + offset, noffset - offset);
590 		offset = noffset;
591 	}
592 
593 	/* build the EHT-cap from sband */
594 	if (he_cap && eht_cap &&
595 	    (action_code == WLAN_TDLS_SETUP_REQUEST ||
596 	     action_code == WLAN_TDLS_SETUP_RESPONSE ||
597 	     action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES)) {
598 		u8 cap_size;
599 
600 		cap_size =
601 			2 + 1 + sizeof(eht_cap->eht_cap_elem) +
602 			ieee80211_eht_mcs_nss_size(&he_cap->he_cap_elem,
603 						   &eht_cap->eht_cap_elem, false) +
604 			ieee80211_eht_ppe_size(eht_cap->eht_ppe_thres[0],
605 					       eht_cap->eht_cap_elem.phy_cap_info);
606 		pos = skb_put(skb, cap_size);
607 		ieee80211_ie_build_eht_cap(pos, he_cap, eht_cap, pos + cap_size, false);
608 	}
609 
610 	/* add any remaining IEs */
611 	if (extra_ies_len) {
612 		noffset = extra_ies_len;
613 		skb_put_data(skb, extra_ies + offset, noffset - offset);
614 	}
615 
616 }
617 
618 static void
ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_link_data * link,struct sk_buff * skb,const u8 * peer,bool initiator,const u8 * extra_ies,size_t extra_ies_len)619 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_link_data *link,
620 				 struct sk_buff *skb, const u8 *peer,
621 				 bool initiator, const u8 *extra_ies,
622 				 size_t extra_ies_len)
623 {
624 	struct ieee80211_sub_if_data *sdata = link->sdata;
625 	struct ieee80211_local *local = sdata->local;
626 	size_t offset = 0, noffset;
627 	struct sta_info *sta, *ap_sta;
628 	struct ieee80211_supported_band *sband;
629 	u8 *pos;
630 
631 	sband = ieee80211_get_link_sband(link);
632 	if (WARN_ON_ONCE(!sband))
633 		return;
634 
635 	sta = sta_info_get(sdata, peer);
636 	ap_sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr);
637 
638 	if (WARN_ON_ONCE(!sta || !ap_sta))
639 		return;
640 
641 	sta->tdls_chandef = link->conf->chandef;
642 
643 	/* add any custom IEs that go before the QoS IE */
644 	if (extra_ies_len) {
645 		static const u8 before_qos[] = {
646 			WLAN_EID_RSN,
647 		};
648 		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
649 					     before_qos,
650 					     ARRAY_SIZE(before_qos),
651 					     offset);
652 		skb_put_data(skb, extra_ies + offset, noffset - offset);
653 		offset = noffset;
654 	}
655 
656 	/* add the QoS param IE if both the peer and we support it */
657 	if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
658 		ieee80211_tdls_add_wmm_param_ie(sdata, skb);
659 
660 	/* add any custom IEs that go before HT operation */
661 	if (extra_ies_len) {
662 		static const u8 before_ht_op[] = {
663 			WLAN_EID_RSN,
664 			WLAN_EID_QOS_CAPA,
665 			WLAN_EID_FAST_BSS_TRANSITION,
666 			WLAN_EID_TIMEOUT_INTERVAL,
667 		};
668 		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
669 					     before_ht_op,
670 					     ARRAY_SIZE(before_ht_op),
671 					     offset);
672 		skb_put_data(skb, extra_ies + offset, noffset - offset);
673 		offset = noffset;
674 	}
675 
676 	/*
677 	 * if HT support is only added in TDLS, we need an HT-operation IE.
678 	 * add the IE as required by IEEE802.11-2012 9.23.3.2.
679 	 */
680 	if (!ap_sta->sta.deflink.ht_cap.ht_supported && sta->sta.deflink.ht_cap.ht_supported) {
681 		u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
682 			   IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
683 			   IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
684 
685 		pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
686 		ieee80211_ie_build_ht_oper(pos, &sta->sta.deflink.ht_cap,
687 					   &link->conf->chandef, prot,
688 					   true);
689 	}
690 
691 	ieee80211_tdls_add_link_ie(link, skb, peer, initiator);
692 
693 	/* only include VHT-operation if not on the 2.4GHz band */
694 	if (sband->band != NL80211_BAND_2GHZ &&
695 	    sta->sta.deflink.vht_cap.vht_supported) {
696 		/*
697 		 * if both peers support WIDER_BW, we can expand the chandef to
698 		 * a wider compatible one, up to 80MHz
699 		 */
700 		if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
701 			ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
702 
703 		pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
704 		ieee80211_ie_build_vht_oper(pos, &sta->sta.deflink.vht_cap,
705 					    &sta->tdls_chandef);
706 	}
707 
708 	/* add any remaining IEs */
709 	if (extra_ies_len) {
710 		noffset = extra_ies_len;
711 		skb_put_data(skb, extra_ies + offset, noffset - offset);
712 	}
713 }
714 
715 static void
ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_link_data * link,struct sk_buff * skb,const u8 * peer,bool initiator,const u8 * extra_ies,size_t extra_ies_len,u8 oper_class,struct cfg80211_chan_def * chandef)716 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_link_data *link,
717 				       struct sk_buff *skb, const u8 *peer,
718 				       bool initiator, const u8 *extra_ies,
719 				       size_t extra_ies_len, u8 oper_class,
720 				       struct cfg80211_chan_def *chandef)
721 {
722 	struct ieee80211_tdls_data *tf;
723 	size_t offset = 0, noffset;
724 
725 	if (WARN_ON_ONCE(!chandef))
726 		return;
727 
728 	tf = (void *)skb->data;
729 	tf->u.chan_switch_req.target_channel =
730 		ieee80211_frequency_to_channel(chandef->chan->center_freq);
731 	tf->u.chan_switch_req.oper_class = oper_class;
732 
733 	if (extra_ies_len) {
734 		static const u8 before_lnkie[] = {
735 			WLAN_EID_SECONDARY_CHANNEL_OFFSET,
736 		};
737 		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
738 					     before_lnkie,
739 					     ARRAY_SIZE(before_lnkie),
740 					     offset);
741 		skb_put_data(skb, extra_ies + offset, noffset - offset);
742 		offset = noffset;
743 	}
744 
745 	ieee80211_tdls_add_link_ie(link, skb, peer, initiator);
746 
747 	/* add any remaining IEs */
748 	if (extra_ies_len) {
749 		noffset = extra_ies_len;
750 		skb_put_data(skb, extra_ies + offset, noffset - offset);
751 	}
752 }
753 
754 static void
ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_link_data * link,struct sk_buff * skb,const u8 * peer,u16 status_code,bool initiator,const u8 * extra_ies,size_t extra_ies_len)755 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_link_data *link,
756 					struct sk_buff *skb, const u8 *peer,
757 					u16 status_code, bool initiator,
758 					const u8 *extra_ies,
759 					size_t extra_ies_len)
760 {
761 	if (status_code == 0)
762 		ieee80211_tdls_add_link_ie(link, skb, peer, initiator);
763 
764 	if (extra_ies_len)
765 		skb_put_data(skb, extra_ies, extra_ies_len);
766 }
767 
ieee80211_tdls_add_ies(struct ieee80211_link_data * link,struct sk_buff * skb,const u8 * peer,u8 action_code,u16 status_code,bool initiator,const u8 * extra_ies,size_t extra_ies_len,u8 oper_class,struct cfg80211_chan_def * chandef)768 static void ieee80211_tdls_add_ies(struct ieee80211_link_data *link,
769 				   struct sk_buff *skb, const u8 *peer,
770 				   u8 action_code, u16 status_code,
771 				   bool initiator, const u8 *extra_ies,
772 				   size_t extra_ies_len, u8 oper_class,
773 				   struct cfg80211_chan_def *chandef)
774 {
775 	switch (action_code) {
776 	case WLAN_TDLS_SETUP_REQUEST:
777 	case WLAN_TDLS_SETUP_RESPONSE:
778 	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
779 		if (status_code == 0)
780 			ieee80211_tdls_add_setup_start_ies(link,
781 							   skb, peer,
782 							   action_code,
783 							   initiator,
784 							   extra_ies,
785 							   extra_ies_len);
786 		break;
787 	case WLAN_TDLS_SETUP_CONFIRM:
788 		if (status_code == 0)
789 			ieee80211_tdls_add_setup_cfm_ies(link, skb, peer,
790 							 initiator, extra_ies,
791 							 extra_ies_len);
792 		break;
793 	case WLAN_TDLS_TEARDOWN:
794 	case WLAN_TDLS_DISCOVERY_REQUEST:
795 		if (extra_ies_len)
796 			skb_put_data(skb, extra_ies, extra_ies_len);
797 		if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
798 			ieee80211_tdls_add_link_ie(link, skb,
799 						   peer, initiator);
800 		break;
801 	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
802 		ieee80211_tdls_add_chan_switch_req_ies(link, skb, peer,
803 						       initiator, extra_ies,
804 						       extra_ies_len,
805 						       oper_class, chandef);
806 		break;
807 	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
808 		ieee80211_tdls_add_chan_switch_resp_ies(link, skb, peer,
809 							status_code,
810 							initiator, extra_ies,
811 							extra_ies_len);
812 		break;
813 	}
814 
815 }
816 
817 static int
ieee80211_prep_tdls_encap_data(struct wiphy * wiphy,struct net_device * dev,struct ieee80211_link_data * link,const u8 * peer,u8 action_code,u8 dialog_token,u16 status_code,struct sk_buff * skb)818 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
819 			       struct ieee80211_link_data *link,
820 			       const u8 *peer, u8 action_code, u8 dialog_token,
821 			       u16 status_code, struct sk_buff *skb)
822 {
823 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
824 	struct ieee80211_tdls_data *tf;
825 
826 	tf = skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
827 
828 	memcpy(tf->da, peer, ETH_ALEN);
829 	memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
830 	tf->ether_type = cpu_to_be16(ETH_P_TDLS);
831 	tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
832 
833 	/* network header is after the ethernet header */
834 	skb_set_network_header(skb, ETH_HLEN);
835 
836 	switch (action_code) {
837 	case WLAN_TDLS_SETUP_REQUEST:
838 		tf->category = WLAN_CATEGORY_TDLS;
839 		tf->action_code = WLAN_TDLS_SETUP_REQUEST;
840 
841 		skb_put(skb, sizeof(tf->u.setup_req));
842 		tf->u.setup_req.dialog_token = dialog_token;
843 		tf->u.setup_req.capability =
844 			cpu_to_le16(ieee80211_get_tdls_sta_capab(link,
845 								 status_code));
846 		break;
847 	case WLAN_TDLS_SETUP_RESPONSE:
848 		tf->category = WLAN_CATEGORY_TDLS;
849 		tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
850 
851 		skb_put(skb, sizeof(tf->u.setup_resp));
852 		tf->u.setup_resp.status_code = cpu_to_le16(status_code);
853 		tf->u.setup_resp.dialog_token = dialog_token;
854 		tf->u.setup_resp.capability =
855 			cpu_to_le16(ieee80211_get_tdls_sta_capab(link,
856 								 status_code));
857 		break;
858 	case WLAN_TDLS_SETUP_CONFIRM:
859 		tf->category = WLAN_CATEGORY_TDLS;
860 		tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
861 
862 		skb_put(skb, sizeof(tf->u.setup_cfm));
863 		tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
864 		tf->u.setup_cfm.dialog_token = dialog_token;
865 		break;
866 	case WLAN_TDLS_TEARDOWN:
867 		tf->category = WLAN_CATEGORY_TDLS;
868 		tf->action_code = WLAN_TDLS_TEARDOWN;
869 
870 		skb_put(skb, sizeof(tf->u.teardown));
871 		tf->u.teardown.reason_code = cpu_to_le16(status_code);
872 		break;
873 	case WLAN_TDLS_DISCOVERY_REQUEST:
874 		tf->category = WLAN_CATEGORY_TDLS;
875 		tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
876 
877 		skb_put(skb, sizeof(tf->u.discover_req));
878 		tf->u.discover_req.dialog_token = dialog_token;
879 		break;
880 	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
881 		tf->category = WLAN_CATEGORY_TDLS;
882 		tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
883 
884 		skb_put(skb, sizeof(tf->u.chan_switch_req));
885 		break;
886 	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
887 		tf->category = WLAN_CATEGORY_TDLS;
888 		tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
889 
890 		skb_put(skb, sizeof(tf->u.chan_switch_resp));
891 		tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
892 		break;
893 	default:
894 		return -EINVAL;
895 	}
896 
897 	return 0;
898 }
899 
900 static int
ieee80211_prep_tdls_direct(struct wiphy * wiphy,struct net_device * dev,const u8 * peer,struct ieee80211_link_data * link,u8 action_code,u8 dialog_token,u16 status_code,struct sk_buff * skb)901 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
902 			   const u8 *peer, struct ieee80211_link_data *link,
903 			   u8 action_code, u8 dialog_token,
904 			   u16 status_code, struct sk_buff *skb)
905 {
906 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
907 	struct ieee80211_mgmt *mgmt;
908 
909 	mgmt = skb_put_zero(skb, 24);
910 	memcpy(mgmt->da, peer, ETH_ALEN);
911 	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
912 	memcpy(mgmt->bssid, link->u.mgd.bssid, ETH_ALEN);
913 	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
914 					  IEEE80211_STYPE_ACTION);
915 
916 	switch (action_code) {
917 	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
918 		skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
919 		mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
920 		mgmt->u.action.u.tdls_discover_resp.action_code =
921 			WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
922 		mgmt->u.action.u.tdls_discover_resp.dialog_token =
923 			dialog_token;
924 		mgmt->u.action.u.tdls_discover_resp.capability =
925 			cpu_to_le16(ieee80211_get_tdls_sta_capab(link,
926 								 status_code));
927 		break;
928 	default:
929 		return -EINVAL;
930 	}
931 
932 	return 0;
933 }
934 
935 static struct sk_buff *
ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data * sdata,const u8 * peer,int link_id,u8 action_code,u8 dialog_token,u16 status_code,bool initiator,const u8 * extra_ies,size_t extra_ies_len,u8 oper_class,struct cfg80211_chan_def * chandef)936 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
937 				      const u8 *peer, int link_id,
938 				      u8 action_code, u8 dialog_token,
939 				      u16 status_code, bool initiator,
940 				      const u8 *extra_ies, size_t extra_ies_len,
941 				      u8 oper_class,
942 				      struct cfg80211_chan_def *chandef)
943 {
944 	struct ieee80211_local *local = sdata->local;
945 	struct sk_buff *skb;
946 	int ret;
947 	struct ieee80211_link_data *link;
948 
949 	link_id = link_id >= 0 ? link_id : 0;
950 	rcu_read_lock();
951 	link = rcu_dereference(sdata->link[link_id]);
952 	if (WARN_ON(!link))
953 		goto unlock;
954 
955 	skb = netdev_alloc_skb(sdata->dev,
956 			       local->hw.extra_tx_headroom +
957 			       max(sizeof(struct ieee80211_mgmt),
958 				   sizeof(struct ieee80211_tdls_data)) +
959 			       50 + /* supported rates */
960 			       10 + /* ext capab */
961 			       26 + /* max(WMM-info, WMM-param) */
962 			       2 + max(sizeof(struct ieee80211_ht_cap),
963 				       sizeof(struct ieee80211_ht_operation)) +
964 			       2 + max(sizeof(struct ieee80211_vht_cap),
965 				       sizeof(struct ieee80211_vht_operation)) +
966 			       2 + 1 + sizeof(struct ieee80211_he_cap_elem) +
967 				       sizeof(struct ieee80211_he_mcs_nss_supp) +
968 				       IEEE80211_HE_PPE_THRES_MAX_LEN +
969 			       2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
970 			       2 + 1 + sizeof(struct ieee80211_eht_cap_elem) +
971 				       sizeof(struct ieee80211_eht_mcs_nss_supp) +
972 				       IEEE80211_EHT_PPE_THRES_MAX_LEN +
973 			       50 + /* supported channels */
974 			       3 + /* 40/20 BSS coex */
975 			       4 + /* AID */
976 			       4 + /* oper classes */
977 			       extra_ies_len +
978 			       sizeof(struct ieee80211_tdls_lnkie));
979 	if (!skb)
980 		goto unlock;
981 
982 	skb_reserve(skb, local->hw.extra_tx_headroom);
983 
984 	switch (action_code) {
985 	case WLAN_TDLS_SETUP_REQUEST:
986 	case WLAN_TDLS_SETUP_RESPONSE:
987 	case WLAN_TDLS_SETUP_CONFIRM:
988 	case WLAN_TDLS_TEARDOWN:
989 	case WLAN_TDLS_DISCOVERY_REQUEST:
990 	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
991 	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
992 		ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
993 						     sdata->dev, link, peer,
994 						     action_code, dialog_token,
995 						     status_code, skb);
996 		break;
997 	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
998 		ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
999 						 peer, link, action_code,
1000 						 dialog_token, status_code,
1001 						 skb);
1002 		break;
1003 	default:
1004 		ret = -ENOTSUPP;
1005 		break;
1006 	}
1007 
1008 	if (ret < 0)
1009 		goto fail;
1010 
1011 	ieee80211_tdls_add_ies(link, skb, peer, action_code, status_code,
1012 			       initiator, extra_ies, extra_ies_len, oper_class,
1013 			       chandef);
1014 	rcu_read_unlock();
1015 	return skb;
1016 
1017 fail:
1018 	dev_kfree_skb(skb);
1019 unlock:
1020 	rcu_read_unlock();
1021 	return NULL;
1022 }
1023 
1024 static int
ieee80211_tdls_prep_mgmt_packet(struct wiphy * wiphy,struct net_device * dev,const u8 * peer,int link_id,u8 action_code,u8 dialog_token,u16 status_code,u32 peer_capability,bool initiator,const u8 * extra_ies,size_t extra_ies_len,u8 oper_class,struct cfg80211_chan_def * chandef)1025 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
1026 				const u8 *peer, int link_id,
1027 				u8 action_code, u8 dialog_token,
1028 				u16 status_code, u32 peer_capability,
1029 				bool initiator, const u8 *extra_ies,
1030 				size_t extra_ies_len, u8 oper_class,
1031 				struct cfg80211_chan_def *chandef)
1032 {
1033 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1034 	struct sk_buff *skb = NULL;
1035 	struct sta_info *sta;
1036 	u32 flags = 0;
1037 	int ret = 0;
1038 
1039 	rcu_read_lock();
1040 	sta = sta_info_get(sdata, peer);
1041 
1042 	/* infer the initiator if we can, to support old userspace */
1043 	switch (action_code) {
1044 	case WLAN_TDLS_SETUP_REQUEST:
1045 		if (sta) {
1046 			set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
1047 			sta->sta.tdls_initiator = false;
1048 		}
1049 		fallthrough;
1050 	case WLAN_TDLS_SETUP_CONFIRM:
1051 	case WLAN_TDLS_DISCOVERY_REQUEST:
1052 		initiator = true;
1053 		break;
1054 	case WLAN_TDLS_SETUP_RESPONSE:
1055 		/*
1056 		 * In some testing scenarios, we send a request and response.
1057 		 * Make the last packet sent take effect for the initiator
1058 		 * value.
1059 		 */
1060 		if (sta) {
1061 			clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
1062 			sta->sta.tdls_initiator = true;
1063 		}
1064 		fallthrough;
1065 	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1066 		initiator = false;
1067 		break;
1068 	case WLAN_TDLS_TEARDOWN:
1069 	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1070 	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1071 		/* any value is ok */
1072 		break;
1073 	default:
1074 		ret = -ENOTSUPP;
1075 		break;
1076 	}
1077 
1078 	if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
1079 		initiator = true;
1080 
1081 	rcu_read_unlock();
1082 	if (ret < 0)
1083 		goto fail;
1084 
1085 	skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer,
1086 						    link_id, action_code,
1087 						    dialog_token, status_code,
1088 						    initiator, extra_ies,
1089 						    extra_ies_len, oper_class,
1090 						    chandef);
1091 	if (!skb) {
1092 		ret = -EINVAL;
1093 		goto fail;
1094 	}
1095 
1096 	if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
1097 		ieee80211_tx_skb_tid(sdata, skb, 7, link_id);
1098 		return 0;
1099 	}
1100 
1101 	/*
1102 	 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1103 	 * we should default to AC_VI.
1104 	 */
1105 	switch (action_code) {
1106 	case WLAN_TDLS_SETUP_REQUEST:
1107 	case WLAN_TDLS_SETUP_RESPONSE:
1108 		skb->priority = 256 + 2;
1109 		break;
1110 	default:
1111 		skb->priority = 256 + 5;
1112 		break;
1113 	}
1114 
1115 	/*
1116 	 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1117 	 * Later, if no ACK is returned from peer, we will re-send the teardown
1118 	 * packet through the AP.
1119 	 */
1120 	if ((action_code == WLAN_TDLS_TEARDOWN) &&
1121 	    ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1122 		bool try_resend; /* Should we keep skb for possible resend */
1123 
1124 		/* If not sending directly to peer - no point in keeping skb */
1125 		rcu_read_lock();
1126 		sta = sta_info_get(sdata, peer);
1127 		try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1128 		rcu_read_unlock();
1129 
1130 		spin_lock_bh(&sdata->u.mgd.teardown_lock);
1131 		if (try_resend && !sdata->u.mgd.teardown_skb) {
1132 			/* Mark it as requiring TX status callback  */
1133 			flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1134 				 IEEE80211_TX_INTFL_MLME_CONN_TX;
1135 
1136 			/*
1137 			 * skb is copied since mac80211 will later set
1138 			 * properties that might not be the same as the AP,
1139 			 * such as encryption, QoS, addresses, etc.
1140 			 *
1141 			 * No problem if skb_copy() fails, so no need to check.
1142 			 */
1143 			sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1144 			sdata->u.mgd.orig_teardown_skb = skb;
1145 		}
1146 		spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1147 	}
1148 
1149 	/* disable bottom halves when entering the Tx path */
1150 	local_bh_disable();
1151 	__ieee80211_subif_start_xmit(skb, dev, flags,
1152 				     IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL);
1153 	local_bh_enable();
1154 
1155 	return ret;
1156 
1157 fail:
1158 	dev_kfree_skb(skb);
1159 	return ret;
1160 }
1161 
1162 static int
ieee80211_tdls_mgmt_setup(struct wiphy * wiphy,struct net_device * dev,const u8 * peer,int link_id,u8 action_code,u8 dialog_token,u16 status_code,u32 peer_capability,bool initiator,const u8 * extra_ies,size_t extra_ies_len)1163 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1164 			  const u8 *peer, int link_id,
1165 			  u8 action_code, u8 dialog_token,
1166 			  u16 status_code, u32 peer_capability, bool initiator,
1167 			  const u8 *extra_ies, size_t extra_ies_len)
1168 {
1169 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1170 	struct ieee80211_local *local = sdata->local;
1171 	enum ieee80211_smps_mode smps_mode =
1172 		sdata->deflink.u.mgd.driver_smps_mode;
1173 	int ret;
1174 
1175 	/* don't support setup with forced SMPS mode that's not off */
1176 	if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1177 	    smps_mode != IEEE80211_SMPS_OFF) {
1178 		tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1179 			 smps_mode);
1180 		return -ENOTSUPP;
1181 	}
1182 
1183 	mutex_lock(&local->mtx);
1184 
1185 	/* we don't support concurrent TDLS peer setups */
1186 	if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1187 	    !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1188 		ret = -EBUSY;
1189 		goto out_unlock;
1190 	}
1191 
1192 	/*
1193 	 * make sure we have a STA representing the peer so we drop or buffer
1194 	 * non-TDLS-setup frames to the peer. We can't send other packets
1195 	 * during setup through the AP path.
1196 	 * Allow error packets to be sent - sometimes we don't even add a STA
1197 	 * before failing the setup.
1198 	 */
1199 	if (status_code == 0) {
1200 		rcu_read_lock();
1201 		if (!sta_info_get(sdata, peer)) {
1202 			rcu_read_unlock();
1203 			ret = -ENOLINK;
1204 			goto out_unlock;
1205 		}
1206 		rcu_read_unlock();
1207 	}
1208 
1209 	ieee80211_flush_queues(local, sdata, false);
1210 	memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1211 	mutex_unlock(&local->mtx);
1212 
1213 	/* we cannot take the mutex while preparing the setup packet */
1214 	ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1215 					      link_id, action_code,
1216 					      dialog_token, status_code,
1217 					      peer_capability, initiator,
1218 					      extra_ies, extra_ies_len, 0,
1219 					      NULL);
1220 	if (ret < 0) {
1221 		mutex_lock(&local->mtx);
1222 		eth_zero_addr(sdata->u.mgd.tdls_peer);
1223 		mutex_unlock(&local->mtx);
1224 		return ret;
1225 	}
1226 
1227 	ieee80211_queue_delayed_work(&sdata->local->hw,
1228 				     &sdata->u.mgd.tdls_peer_del_work,
1229 				     TDLS_PEER_SETUP_TIMEOUT);
1230 	return 0;
1231 
1232 out_unlock:
1233 	mutex_unlock(&local->mtx);
1234 	return ret;
1235 }
1236 
1237 static int
ieee80211_tdls_mgmt_teardown(struct wiphy * wiphy,struct net_device * dev,const u8 * peer,int link_id,u8 action_code,u8 dialog_token,u16 status_code,u32 peer_capability,bool initiator,const u8 * extra_ies,size_t extra_ies_len)1238 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1239 			     const u8 *peer, int link_id,
1240 			     u8 action_code, u8 dialog_token,
1241 			     u16 status_code, u32 peer_capability,
1242 			     bool initiator, const u8 *extra_ies,
1243 			     size_t extra_ies_len)
1244 {
1245 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1246 	struct ieee80211_local *local = sdata->local;
1247 	struct sta_info *sta;
1248 	int ret;
1249 
1250 	/*
1251 	 * No packets can be transmitted to the peer via the AP during setup -
1252 	 * the STA is set as a TDLS peer, but is not authorized.
1253 	 * During teardown, we prevent direct transmissions by stopping the
1254 	 * queues and flushing all direct packets.
1255 	 */
1256 	ieee80211_stop_vif_queues(local, sdata,
1257 				  IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1258 	ieee80211_flush_queues(local, sdata, false);
1259 
1260 	ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1261 					      link_id, action_code,
1262 					      dialog_token, status_code,
1263 					      peer_capability, initiator,
1264 					      extra_ies, extra_ies_len, 0,
1265 					      NULL);
1266 	if (ret < 0)
1267 		sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1268 			  ret);
1269 
1270 	/*
1271 	 * Remove the STA AUTH flag to force further traffic through the AP. If
1272 	 * the STA was unreachable, it was already removed.
1273 	 */
1274 	rcu_read_lock();
1275 	sta = sta_info_get(sdata, peer);
1276 	if (sta)
1277 		clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1278 	rcu_read_unlock();
1279 
1280 	ieee80211_wake_vif_queues(local, sdata,
1281 				  IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1282 
1283 	return 0;
1284 }
1285 
ieee80211_tdls_mgmt(struct wiphy * wiphy,struct net_device * dev,const u8 * peer,int link_id,u8 action_code,u8 dialog_token,u16 status_code,u32 peer_capability,bool initiator,const u8 * extra_ies,size_t extra_ies_len)1286 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1287 			const u8 *peer, int link_id,
1288 			u8 action_code, u8 dialog_token, u16 status_code,
1289 			u32 peer_capability, bool initiator,
1290 			const u8 *extra_ies, size_t extra_ies_len)
1291 {
1292 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1293 	int ret;
1294 
1295 	if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1296 		return -ENOTSUPP;
1297 
1298 	/* make sure we are in managed mode, and associated */
1299 	if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1300 	    !sdata->u.mgd.associated)
1301 		return -EINVAL;
1302 
1303 	switch (action_code) {
1304 	case WLAN_TDLS_SETUP_REQUEST:
1305 	case WLAN_TDLS_SETUP_RESPONSE:
1306 		ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer,
1307 						link_id, action_code,
1308 						dialog_token, status_code,
1309 						peer_capability, initiator,
1310 						extra_ies, extra_ies_len);
1311 		break;
1312 	case WLAN_TDLS_TEARDOWN:
1313 		ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, link_id,
1314 						   action_code, dialog_token,
1315 						   status_code,
1316 						   peer_capability, initiator,
1317 						   extra_ies, extra_ies_len);
1318 		break;
1319 	case WLAN_TDLS_DISCOVERY_REQUEST:
1320 		/*
1321 		 * Protect the discovery so we can hear the TDLS discovery
1322 		 * response frame. It is transmitted directly and not buffered
1323 		 * by the AP.
1324 		 */
1325 		drv_mgd_protect_tdls_discover(sdata->local, sdata);
1326 		fallthrough;
1327 	case WLAN_TDLS_SETUP_CONFIRM:
1328 	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1329 		/* no special handling */
1330 		ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1331 						      link_id, action_code,
1332 						      dialog_token,
1333 						      status_code,
1334 						      peer_capability,
1335 						      initiator, extra_ies,
1336 						      extra_ies_len, 0, NULL);
1337 		break;
1338 	default:
1339 		ret = -EOPNOTSUPP;
1340 		break;
1341 	}
1342 
1343 	tdls_dbg(sdata, "TDLS mgmt action %d peer %pM link_id %d status %d\n",
1344 		 action_code, peer, link_id, ret);
1345 	return ret;
1346 }
1347 
iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data * sdata,struct sta_info * sta)1348 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1349 					 struct sta_info *sta)
1350 {
1351 	struct ieee80211_local *local = sdata->local;
1352 	struct ieee80211_chanctx_conf *conf;
1353 	struct ieee80211_chanctx *ctx;
1354 	enum nl80211_chan_width width;
1355 	struct ieee80211_supported_band *sband;
1356 
1357 	mutex_lock(&local->chanctx_mtx);
1358 	conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf,
1359 					 lockdep_is_held(&local->chanctx_mtx));
1360 	if (conf) {
1361 		width = conf->def.width;
1362 		sband = local->hw.wiphy->bands[conf->def.chan->band];
1363 		ctx = container_of(conf, struct ieee80211_chanctx, conf);
1364 		ieee80211_recalc_chanctx_chantype(local, ctx);
1365 
1366 		/* if width changed and a peer is given, update its BW */
1367 		if (width != conf->def.width && sta &&
1368 		    test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1369 			enum ieee80211_sta_rx_bandwidth bw;
1370 
1371 			bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1372 			bw = min(bw, ieee80211_sta_cap_rx_bw(&sta->deflink));
1373 			if (bw != sta->sta.deflink.bandwidth) {
1374 				sta->sta.deflink.bandwidth = bw;
1375 				rate_control_rate_update(local, sband, sta, 0,
1376 							 IEEE80211_RC_BW_CHANGED);
1377 				/*
1378 				 * if a TDLS peer BW was updated, we need to
1379 				 * recalc the chandef width again, to get the
1380 				 * correct chanctx min_def
1381 				 */
1382 				ieee80211_recalc_chanctx_chantype(local, ctx);
1383 			}
1384 		}
1385 
1386 	}
1387 	mutex_unlock(&local->chanctx_mtx);
1388 }
1389 
iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data * sdata)1390 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1391 {
1392 	struct sta_info *sta;
1393 	bool result = false;
1394 
1395 	rcu_read_lock();
1396 	list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1397 		if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1398 		    !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1399 		    !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1400 		    !sta->sta.deflink.ht_cap.ht_supported)
1401 			continue;
1402 		result = true;
1403 		break;
1404 	}
1405 	rcu_read_unlock();
1406 
1407 	return result;
1408 }
1409 
1410 static void
iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data * sdata,struct sta_info * sta)1411 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1412 				   struct sta_info *sta)
1413 {
1414 	bool tdls_ht;
1415 	u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1416 			 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1417 			 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1418 	u16 opmode;
1419 
1420 	/* Nothing to do if the BSS connection uses HT */
1421 	if (!(sdata->deflink.u.mgd.conn_flags & IEEE80211_CONN_DISABLE_HT))
1422 		return;
1423 
1424 	tdls_ht = (sta && sta->sta.deflink.ht_cap.ht_supported) ||
1425 		  iee80211_tdls_have_ht_peers(sdata);
1426 
1427 	opmode = sdata->vif.bss_conf.ht_operation_mode;
1428 
1429 	if (tdls_ht)
1430 		opmode |= protection;
1431 	else
1432 		opmode &= ~protection;
1433 
1434 	if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1435 		return;
1436 
1437 	sdata->vif.bss_conf.ht_operation_mode = opmode;
1438 	ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1439 					  BSS_CHANGED_HT);
1440 }
1441 
ieee80211_tdls_oper(struct wiphy * wiphy,struct net_device * dev,const u8 * peer,enum nl80211_tdls_operation oper)1442 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1443 			const u8 *peer, enum nl80211_tdls_operation oper)
1444 {
1445 	struct sta_info *sta;
1446 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1447 	struct ieee80211_local *local = sdata->local;
1448 	int ret;
1449 
1450 	if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1451 		return -ENOTSUPP;
1452 
1453 	if (sdata->vif.type != NL80211_IFTYPE_STATION)
1454 		return -EINVAL;
1455 
1456 	switch (oper) {
1457 	case NL80211_TDLS_ENABLE_LINK:
1458 	case NL80211_TDLS_DISABLE_LINK:
1459 		break;
1460 	case NL80211_TDLS_TEARDOWN:
1461 	case NL80211_TDLS_SETUP:
1462 	case NL80211_TDLS_DISCOVERY_REQ:
1463 		/* We don't support in-driver setup/teardown/discovery */
1464 		return -ENOTSUPP;
1465 	}
1466 
1467 	/* protect possible bss_conf changes and avoid concurrency in
1468 	 * ieee80211_bss_info_change_notify()
1469 	 */
1470 	sdata_lock(sdata);
1471 	mutex_lock(&local->mtx);
1472 	tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1473 
1474 	switch (oper) {
1475 	case NL80211_TDLS_ENABLE_LINK:
1476 		if (sdata->vif.bss_conf.csa_active) {
1477 			tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1478 			ret = -EBUSY;
1479 			break;
1480 		}
1481 
1482 		mutex_lock(&local->sta_mtx);
1483 		sta = sta_info_get(sdata, peer);
1484 		if (!sta) {
1485 			mutex_unlock(&local->sta_mtx);
1486 			ret = -ENOLINK;
1487 			break;
1488 		}
1489 
1490 		iee80211_tdls_recalc_chanctx(sdata, sta);
1491 		iee80211_tdls_recalc_ht_protection(sdata, sta);
1492 
1493 		set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1494 		mutex_unlock(&local->sta_mtx);
1495 
1496 		WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1497 			     !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1498 		ret = 0;
1499 		break;
1500 	case NL80211_TDLS_DISABLE_LINK:
1501 		/*
1502 		 * The teardown message in ieee80211_tdls_mgmt_teardown() was
1503 		 * created while the queues were stopped, so it might still be
1504 		 * pending. Before flushing the queues we need to be sure the
1505 		 * message is handled by the tasklet handling pending messages,
1506 		 * otherwise we might start destroying the station before
1507 		 * sending the teardown packet.
1508 		 * Note that this only forces the tasklet to flush pendings -
1509 		 * not to stop the tasklet from rescheduling itself.
1510 		 */
1511 		tasklet_kill(&local->tx_pending_tasklet);
1512 		/* flush a potentially queued teardown packet */
1513 		ieee80211_flush_queues(local, sdata, false);
1514 
1515 		ret = sta_info_destroy_addr(sdata, peer);
1516 
1517 		mutex_lock(&local->sta_mtx);
1518 		iee80211_tdls_recalc_ht_protection(sdata, NULL);
1519 		mutex_unlock(&local->sta_mtx);
1520 
1521 		iee80211_tdls_recalc_chanctx(sdata, NULL);
1522 		break;
1523 	default:
1524 		ret = -ENOTSUPP;
1525 		break;
1526 	}
1527 
1528 	if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1529 		cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1530 		eth_zero_addr(sdata->u.mgd.tdls_peer);
1531 	}
1532 
1533 	if (ret == 0)
1534 		wiphy_work_queue(sdata->local->hw.wiphy,
1535 				 &sdata->deflink.u.mgd.request_smps_work);
1536 
1537 	mutex_unlock(&local->mtx);
1538 	sdata_unlock(sdata);
1539 	return ret;
1540 }
1541 
ieee80211_tdls_oper_request(struct ieee80211_vif * vif,const u8 * peer,enum nl80211_tdls_operation oper,u16 reason_code,gfp_t gfp)1542 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1543 				 enum nl80211_tdls_operation oper,
1544 				 u16 reason_code, gfp_t gfp)
1545 {
1546 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1547 
1548 	if (vif->type != NL80211_IFTYPE_STATION || !vif->cfg.assoc) {
1549 		sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1550 			  oper);
1551 		return;
1552 	}
1553 
1554 	cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1555 }
1556 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1557 
1558 static void
iee80211_tdls_add_ch_switch_timing(u8 * buf,u16 switch_time,u16 switch_timeout)1559 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1560 {
1561 	struct ieee80211_ch_switch_timing *ch_sw;
1562 
1563 	*buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1564 	*buf++ = sizeof(struct ieee80211_ch_switch_timing);
1565 
1566 	ch_sw = (void *)buf;
1567 	ch_sw->switch_time = cpu_to_le16(switch_time);
1568 	ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1569 }
1570 
1571 /* find switch timing IE in SKB ready for Tx */
ieee80211_tdls_find_sw_timing_ie(struct sk_buff * skb)1572 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1573 {
1574 	struct ieee80211_tdls_data *tf;
1575 	const u8 *ie_start;
1576 
1577 	/*
1578 	 * Get the offset for the new location of the switch timing IE.
1579 	 * The SKB network header will now point to the "payload_type"
1580 	 * element of the TDLS data frame struct.
1581 	 */
1582 	tf = container_of(skb->data + skb_network_offset(skb),
1583 			  struct ieee80211_tdls_data, payload_type);
1584 	ie_start = tf->u.chan_switch_req.variable;
1585 	return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1586 				skb->len - (ie_start - skb->data));
1587 }
1588 
1589 static struct sk_buff *
ieee80211_tdls_ch_sw_tmpl_get(struct sta_info * sta,u8 oper_class,struct cfg80211_chan_def * chandef,u32 * ch_sw_tm_ie_offset)1590 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1591 			      struct cfg80211_chan_def *chandef,
1592 			      u32 *ch_sw_tm_ie_offset)
1593 {
1594 	struct ieee80211_sub_if_data *sdata = sta->sdata;
1595 	u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1596 		     2 + sizeof(struct ieee80211_ch_switch_timing)];
1597 	int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1598 	u8 *pos = extra_ies;
1599 	struct sk_buff *skb;
1600 	int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0;
1601 
1602 	/*
1603 	 * if chandef points to a wide channel add a Secondary-Channel
1604 	 * Offset information element
1605 	 */
1606 	if (chandef->width == NL80211_CHAN_WIDTH_40) {
1607 		struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1608 		bool ht40plus;
1609 
1610 		*pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1611 		*pos++ = sizeof(*sec_chan_ie);
1612 		sec_chan_ie = (void *)pos;
1613 
1614 		ht40plus = cfg80211_get_chandef_type(chandef) ==
1615 							NL80211_CHAN_HT40PLUS;
1616 		sec_chan_ie->sec_chan_offs = ht40plus ?
1617 					     IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1618 					     IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1619 		pos += sizeof(*sec_chan_ie);
1620 
1621 		extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1622 	}
1623 
1624 	/* just set the values to 0, this is a template */
1625 	iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1626 
1627 	skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1628 					      link_id,
1629 					      WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1630 					      0, 0, !sta->sta.tdls_initiator,
1631 					      extra_ies, extra_ies_len,
1632 					      oper_class, chandef);
1633 	if (!skb)
1634 		return NULL;
1635 
1636 	skb = ieee80211_build_data_template(sdata, skb, 0);
1637 	if (IS_ERR(skb)) {
1638 		tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1639 		return NULL;
1640 	}
1641 
1642 	if (ch_sw_tm_ie_offset) {
1643 		const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1644 
1645 		if (!tm_ie) {
1646 			tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1647 			dev_kfree_skb_any(skb);
1648 			return NULL;
1649 		}
1650 
1651 		*ch_sw_tm_ie_offset = tm_ie - skb->data;
1652 	}
1653 
1654 	tdls_dbg(sdata,
1655 		 "TDLS channel switch request template for %pM ch %d width %d\n",
1656 		 sta->sta.addr, chandef->chan->center_freq, chandef->width);
1657 	return skb;
1658 }
1659 
1660 int
ieee80211_tdls_channel_switch(struct wiphy * wiphy,struct net_device * dev,const u8 * addr,u8 oper_class,struct cfg80211_chan_def * chandef)1661 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1662 			      const u8 *addr, u8 oper_class,
1663 			      struct cfg80211_chan_def *chandef)
1664 {
1665 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1666 	struct ieee80211_local *local = sdata->local;
1667 	struct sta_info *sta;
1668 	struct sk_buff *skb = NULL;
1669 	u32 ch_sw_tm_ie;
1670 	int ret;
1671 
1672 	if (chandef->chan->freq_offset)
1673 		/* this may work, but is untested */
1674 		return -EOPNOTSUPP;
1675 
1676 	mutex_lock(&local->sta_mtx);
1677 	sta = sta_info_get(sdata, addr);
1678 	if (!sta) {
1679 		tdls_dbg(sdata,
1680 			 "Invalid TDLS peer %pM for channel switch request\n",
1681 			 addr);
1682 		ret = -ENOENT;
1683 		goto out;
1684 	}
1685 
1686 	if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1687 		tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1688 			 addr);
1689 		ret = -ENOTSUPP;
1690 		goto out;
1691 	}
1692 
1693 	skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1694 					    &ch_sw_tm_ie);
1695 	if (!skb) {
1696 		ret = -ENOENT;
1697 		goto out;
1698 	}
1699 
1700 	ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1701 				      chandef, skb, ch_sw_tm_ie);
1702 	if (!ret)
1703 		set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1704 
1705 out:
1706 	mutex_unlock(&local->sta_mtx);
1707 	dev_kfree_skb_any(skb);
1708 	return ret;
1709 }
1710 
1711 void
ieee80211_tdls_cancel_channel_switch(struct wiphy * wiphy,struct net_device * dev,const u8 * addr)1712 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1713 				     struct net_device *dev,
1714 				     const u8 *addr)
1715 {
1716 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1717 	struct ieee80211_local *local = sdata->local;
1718 	struct sta_info *sta;
1719 
1720 	mutex_lock(&local->sta_mtx);
1721 	sta = sta_info_get(sdata, addr);
1722 	if (!sta) {
1723 		tdls_dbg(sdata,
1724 			 "Invalid TDLS peer %pM for channel switch cancel\n",
1725 			 addr);
1726 		goto out;
1727 	}
1728 
1729 	if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1730 		tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1731 			 addr);
1732 		goto out;
1733 	}
1734 
1735 	drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1736 	clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1737 
1738 out:
1739 	mutex_unlock(&local->sta_mtx);
1740 }
1741 
1742 static struct sk_buff *
ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info * sta,u32 * ch_sw_tm_ie_offset)1743 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1744 				   u32 *ch_sw_tm_ie_offset)
1745 {
1746 	struct ieee80211_sub_if_data *sdata = sta->sdata;
1747 	struct sk_buff *skb;
1748 	u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1749 	int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0;
1750 
1751 	/* initial timing are always zero in the template */
1752 	iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1753 
1754 	skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1755 					link_id,
1756 					WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1757 					0, 0, !sta->sta.tdls_initiator,
1758 					extra_ies, sizeof(extra_ies), 0, NULL);
1759 	if (!skb)
1760 		return NULL;
1761 
1762 	skb = ieee80211_build_data_template(sdata, skb, 0);
1763 	if (IS_ERR(skb)) {
1764 		tdls_dbg(sdata,
1765 			 "Failed building TDLS channel switch resp frame\n");
1766 		return NULL;
1767 	}
1768 
1769 	if (ch_sw_tm_ie_offset) {
1770 		const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1771 
1772 		if (!tm_ie) {
1773 			tdls_dbg(sdata,
1774 				 "No switch timing IE in TDLS switch resp\n");
1775 			dev_kfree_skb_any(skb);
1776 			return NULL;
1777 		}
1778 
1779 		*ch_sw_tm_ie_offset = tm_ie - skb->data;
1780 	}
1781 
1782 	tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1783 		 sta->sta.addr);
1784 	return skb;
1785 }
1786 
1787 static int
ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1788 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1789 					   struct sk_buff *skb)
1790 {
1791 	struct ieee80211_local *local = sdata->local;
1792 	struct ieee802_11_elems *elems = NULL;
1793 	struct sta_info *sta;
1794 	struct ieee80211_tdls_data *tf = (void *)skb->data;
1795 	bool local_initiator;
1796 	struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1797 	int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1798 	struct ieee80211_tdls_ch_sw_params params = {};
1799 	int ret;
1800 
1801 	params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1802 	params.timestamp = rx_status->device_timestamp;
1803 
1804 	if (skb->len < baselen) {
1805 		tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1806 			 skb->len);
1807 		return -EINVAL;
1808 	}
1809 
1810 	mutex_lock(&local->sta_mtx);
1811 	sta = sta_info_get(sdata, tf->sa);
1812 	if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1813 		tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1814 			 tf->sa);
1815 		ret = -EINVAL;
1816 		goto out;
1817 	}
1818 
1819 	params.sta = &sta->sta;
1820 	params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1821 	if (params.status != 0) {
1822 		ret = 0;
1823 		goto call_drv;
1824 	}
1825 
1826 	elems = ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1827 				       skb->len - baselen, false, NULL);
1828 	if (!elems) {
1829 		ret = -ENOMEM;
1830 		goto out;
1831 	}
1832 
1833 	if (elems->parse_error) {
1834 		tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1835 		ret = -EINVAL;
1836 		goto out;
1837 	}
1838 
1839 	if (!elems->ch_sw_timing || !elems->lnk_id) {
1840 		tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1841 		ret = -EINVAL;
1842 		goto out;
1843 	}
1844 
1845 	/* validate the initiator is set correctly */
1846 	local_initiator =
1847 		!memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1848 	if (local_initiator == sta->sta.tdls_initiator) {
1849 		tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1850 		ret = -EINVAL;
1851 		goto out;
1852 	}
1853 
1854 	params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time);
1855 	params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout);
1856 
1857 	params.tmpl_skb =
1858 		ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1859 	if (!params.tmpl_skb) {
1860 		ret = -ENOENT;
1861 		goto out;
1862 	}
1863 
1864 	ret = 0;
1865 call_drv:
1866 	drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1867 
1868 	tdls_dbg(sdata,
1869 		 "TDLS channel switch response received from %pM status %d\n",
1870 		 tf->sa, params.status);
1871 
1872 out:
1873 	mutex_unlock(&local->sta_mtx);
1874 	dev_kfree_skb_any(params.tmpl_skb);
1875 	kfree(elems);
1876 	return ret;
1877 }
1878 
1879 static int
ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1880 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1881 					  struct sk_buff *skb)
1882 {
1883 	struct ieee80211_local *local = sdata->local;
1884 	struct ieee802_11_elems *elems;
1885 	struct cfg80211_chan_def chandef;
1886 	struct ieee80211_channel *chan;
1887 	enum nl80211_channel_type chan_type;
1888 	int freq;
1889 	u8 target_channel, oper_class;
1890 	bool local_initiator;
1891 	struct sta_info *sta;
1892 	enum nl80211_band band;
1893 	struct ieee80211_tdls_data *tf = (void *)skb->data;
1894 	struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1895 	int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1896 	struct ieee80211_tdls_ch_sw_params params = {};
1897 	int ret = 0;
1898 
1899 	params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1900 	params.timestamp = rx_status->device_timestamp;
1901 
1902 	if (skb->len < baselen) {
1903 		tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1904 			 skb->len);
1905 		return -EINVAL;
1906 	}
1907 
1908 	target_channel = tf->u.chan_switch_req.target_channel;
1909 	oper_class = tf->u.chan_switch_req.oper_class;
1910 
1911 	/*
1912 	 * We can't easily infer the channel band. The operating class is
1913 	 * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1914 	 * solution here is to treat channels with number >14 as 5GHz ones,
1915 	 * and specifically check for the (oper_class, channel) combinations
1916 	 * where this doesn't hold. These are thankfully unique according to
1917 	 * IEEE802.11-2012.
1918 	 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1919 	 * valid here.
1920 	 */
1921 	if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1922 	     oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1923 	     target_channel < 14)
1924 		band = NL80211_BAND_5GHZ;
1925 	else
1926 		band = target_channel < 14 ? NL80211_BAND_2GHZ :
1927 					     NL80211_BAND_5GHZ;
1928 
1929 	freq = ieee80211_channel_to_frequency(target_channel, band);
1930 	if (freq == 0) {
1931 		tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1932 			 target_channel);
1933 		return -EINVAL;
1934 	}
1935 
1936 	chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1937 	if (!chan) {
1938 		tdls_dbg(sdata,
1939 			 "Unsupported channel for TDLS chan switch: %d\n",
1940 			 target_channel);
1941 		return -EINVAL;
1942 	}
1943 
1944 	elems = ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1945 				       skb->len - baselen, false, NULL);
1946 	if (!elems)
1947 		return -ENOMEM;
1948 
1949 	if (elems->parse_error) {
1950 		tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1951 		ret = -EINVAL;
1952 		goto free;
1953 	}
1954 
1955 	if (!elems->ch_sw_timing || !elems->lnk_id) {
1956 		tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1957 		ret = -EINVAL;
1958 		goto free;
1959 	}
1960 
1961 	if (!elems->sec_chan_offs) {
1962 		chan_type = NL80211_CHAN_HT20;
1963 	} else {
1964 		switch (elems->sec_chan_offs->sec_chan_offs) {
1965 		case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1966 			chan_type = NL80211_CHAN_HT40PLUS;
1967 			break;
1968 		case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1969 			chan_type = NL80211_CHAN_HT40MINUS;
1970 			break;
1971 		default:
1972 			chan_type = NL80211_CHAN_HT20;
1973 			break;
1974 		}
1975 	}
1976 
1977 	cfg80211_chandef_create(&chandef, chan, chan_type);
1978 
1979 	/* we will be active on the TDLS link */
1980 	if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1981 					   sdata->wdev.iftype)) {
1982 		tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1983 		ret = -EINVAL;
1984 		goto free;
1985 	}
1986 
1987 	mutex_lock(&local->sta_mtx);
1988 	sta = sta_info_get(sdata, tf->sa);
1989 	if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1990 		tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1991 			 tf->sa);
1992 		ret = -EINVAL;
1993 		goto out;
1994 	}
1995 
1996 	params.sta = &sta->sta;
1997 
1998 	/* validate the initiator is set correctly */
1999 	local_initiator =
2000 		!memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
2001 	if (local_initiator == sta->sta.tdls_initiator) {
2002 		tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
2003 		ret = -EINVAL;
2004 		goto out;
2005 	}
2006 
2007 	/* peer should have known better */
2008 	if (!sta->sta.deflink.ht_cap.ht_supported && elems->sec_chan_offs &&
2009 	    elems->sec_chan_offs->sec_chan_offs) {
2010 		tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
2011 		ret = -ENOTSUPP;
2012 		goto out;
2013 	}
2014 
2015 	params.chandef = &chandef;
2016 	params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time);
2017 	params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout);
2018 
2019 	params.tmpl_skb =
2020 		ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
2021 						   &params.ch_sw_tm_ie);
2022 	if (!params.tmpl_skb) {
2023 		ret = -ENOENT;
2024 		goto out;
2025 	}
2026 
2027 	drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
2028 
2029 	tdls_dbg(sdata,
2030 		 "TDLS ch switch request received from %pM ch %d width %d\n",
2031 		 tf->sa, params.chandef->chan->center_freq,
2032 		 params.chandef->width);
2033 out:
2034 	mutex_unlock(&local->sta_mtx);
2035 	dev_kfree_skb_any(params.tmpl_skb);
2036 free:
2037 	kfree(elems);
2038 	return ret;
2039 }
2040 
2041 void
ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)2042 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
2043 				      struct sk_buff *skb)
2044 {
2045 	struct ieee80211_tdls_data *tf = (void *)skb->data;
2046 	struct wiphy *wiphy = sdata->local->hw.wiphy;
2047 
2048 	lockdep_assert_wiphy(wiphy);
2049 
2050 	/* make sure the driver supports it */
2051 	if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
2052 		return;
2053 
2054 	/* we want to access the entire packet */
2055 	if (skb_linearize(skb))
2056 		return;
2057 	/*
2058 	 * The packet/size was already validated by mac80211 Rx path, only look
2059 	 * at the action type.
2060 	 */
2061 	switch (tf->action_code) {
2062 	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
2063 		ieee80211_process_tdls_channel_switch_req(sdata, skb);
2064 		break;
2065 	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
2066 		ieee80211_process_tdls_channel_switch_resp(sdata, skb);
2067 		break;
2068 	default:
2069 		WARN_ON_ONCE(1);
2070 		return;
2071 	}
2072 }
2073 
ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data * sdata)2074 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
2075 {
2076 	struct sta_info *sta;
2077 	u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
2078 
2079 	rcu_read_lock();
2080 	list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
2081 		if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
2082 		    !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2083 			continue;
2084 
2085 		ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
2086 					    NL80211_TDLS_TEARDOWN, reason,
2087 					    GFP_ATOMIC);
2088 	}
2089 	rcu_read_unlock();
2090 }
2091 
ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data * sdata,const u8 * peer,u16 reason)2092 void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata,
2093 				      const u8 *peer, u16 reason)
2094 {
2095 	struct ieee80211_sta *sta;
2096 
2097 	rcu_read_lock();
2098 	sta = ieee80211_find_sta(&sdata->vif, peer);
2099 	if (!sta || !sta->tdls) {
2100 		rcu_read_unlock();
2101 		return;
2102 	}
2103 	rcu_read_unlock();
2104 
2105 	tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n",
2106 		 peer, reason,
2107 		 ieee80211_get_reason_code_string(reason));
2108 
2109 	ieee80211_tdls_oper_request(&sdata->vif, peer,
2110 				    NL80211_TDLS_TEARDOWN,
2111 				    WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE,
2112 				    GFP_ATOMIC);
2113 }
2114