xref: /linux/net/mac80211/tdls.c (revision 79790b6818e96c58fe2bffee1b418c16e64e7b80)
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, 2021-2024 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 wiphy * wiphy,struct wiphy_work * wk)24 void ieee80211_tdls_peer_del_work(struct wiphy *wiphy, struct wiphy_work *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 	lockdep_assert_wiphy(local->hw.wiphy);
34 
35 	if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
36 		tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
37 		sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
38 		eth_zero_addr(sdata->u.mgd.tdls_peer);
39 	}
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->chanreq.oper,
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 	static const 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, NULL);
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_put_srates_elem(skb, sband, 0, 0, 0, WLAN_EID_SUPP_RATES);
386 	ieee80211_put_srates_elem(skb, sband, 0, 0, 0, WLAN_EID_EXT_SUPP_RATES);
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->chanreq.oper;
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 (action_code == WLAN_TDLS_SETUP_REQUEST ||
552 	    action_code == WLAN_TDLS_SETUP_RESPONSE ||
553 	    action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
554 		ieee80211_put_he_cap(skb, sdata, sband, NULL);
555 
556 		/* Build HE 6Ghz capa IE from sband */
557 		if (sband->band == NL80211_BAND_6GHZ)
558 			ieee80211_put_he_6ghz_cap(skb, sdata, link->smps_mode);
559 	}
560 
561 	/* add any custom IEs that go before EHT capabilities */
562 	if (extra_ies_len) {
563 		static const u8 before_he_cap[] = {
564 			WLAN_EID_EXTENSION,
565 			WLAN_EID_EXT_FILS_REQ_PARAMS,
566 			WLAN_EID_AP_CSN,
567 		};
568 
569 		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
570 					     before_he_cap,
571 					     ARRAY_SIZE(before_he_cap),
572 					     offset);
573 		skb_put_data(skb, extra_ies + offset, noffset - offset);
574 		offset = noffset;
575 	}
576 
577 	/* build the EHT-cap from sband */
578 	if (action_code == WLAN_TDLS_SETUP_REQUEST ||
579 	    action_code == WLAN_TDLS_SETUP_RESPONSE ||
580 	    action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
581 		ieee80211_put_eht_cap(skb, sdata, sband, NULL);
582 
583 	/* add any remaining IEs */
584 	if (extra_ies_len) {
585 		noffset = extra_ies_len;
586 		skb_put_data(skb, extra_ies + offset, noffset - offset);
587 	}
588 
589 }
590 
591 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)592 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_link_data *link,
593 				 struct sk_buff *skb, const u8 *peer,
594 				 bool initiator, const u8 *extra_ies,
595 				 size_t extra_ies_len)
596 {
597 	struct ieee80211_sub_if_data *sdata = link->sdata;
598 	struct ieee80211_local *local = sdata->local;
599 	size_t offset = 0, noffset;
600 	struct sta_info *sta, *ap_sta;
601 	struct ieee80211_supported_band *sband;
602 	u8 *pos;
603 
604 	sband = ieee80211_get_link_sband(link);
605 	if (WARN_ON_ONCE(!sband))
606 		return;
607 
608 	sta = sta_info_get(sdata, peer);
609 	ap_sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr);
610 
611 	if (WARN_ON_ONCE(!sta || !ap_sta))
612 		return;
613 
614 	sta->tdls_chandef = link->conf->chanreq.oper;
615 
616 	/* add any custom IEs that go before the QoS IE */
617 	if (extra_ies_len) {
618 		static const u8 before_qos[] = {
619 			WLAN_EID_RSN,
620 		};
621 		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
622 					     before_qos,
623 					     ARRAY_SIZE(before_qos),
624 					     offset);
625 		skb_put_data(skb, extra_ies + offset, noffset - offset);
626 		offset = noffset;
627 	}
628 
629 	/* add the QoS param IE if both the peer and we support it */
630 	if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
631 		ieee80211_tdls_add_wmm_param_ie(sdata, skb);
632 
633 	/* add any custom IEs that go before HT operation */
634 	if (extra_ies_len) {
635 		static const u8 before_ht_op[] = {
636 			WLAN_EID_RSN,
637 			WLAN_EID_QOS_CAPA,
638 			WLAN_EID_FAST_BSS_TRANSITION,
639 			WLAN_EID_TIMEOUT_INTERVAL,
640 		};
641 		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
642 					     before_ht_op,
643 					     ARRAY_SIZE(before_ht_op),
644 					     offset);
645 		skb_put_data(skb, extra_ies + offset, noffset - offset);
646 		offset = noffset;
647 	}
648 
649 	/*
650 	 * if HT support is only added in TDLS, we need an HT-operation IE.
651 	 * add the IE as required by IEEE802.11-2012 9.23.3.2.
652 	 */
653 	if (!ap_sta->sta.deflink.ht_cap.ht_supported && sta->sta.deflink.ht_cap.ht_supported) {
654 		u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
655 			   IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
656 			   IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
657 
658 		pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
659 		ieee80211_ie_build_ht_oper(pos, &sta->sta.deflink.ht_cap,
660 					   &link->conf->chanreq.oper, prot,
661 					   true);
662 	}
663 
664 	ieee80211_tdls_add_link_ie(link, skb, peer, initiator);
665 
666 	/* only include VHT-operation if not on the 2.4GHz band */
667 	if (sband->band != NL80211_BAND_2GHZ &&
668 	    sta->sta.deflink.vht_cap.vht_supported) {
669 		/*
670 		 * if both peers support WIDER_BW, we can expand the chandef to
671 		 * a wider compatible one, up to 80MHz
672 		 */
673 		if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
674 			ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
675 
676 		pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
677 		ieee80211_ie_build_vht_oper(pos, &sta->sta.deflink.vht_cap,
678 					    &sta->tdls_chandef);
679 	}
680 
681 	/* add any remaining IEs */
682 	if (extra_ies_len) {
683 		noffset = extra_ies_len;
684 		skb_put_data(skb, extra_ies + offset, noffset - offset);
685 	}
686 }
687 
688 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)689 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_link_data *link,
690 				       struct sk_buff *skb, const u8 *peer,
691 				       bool initiator, const u8 *extra_ies,
692 				       size_t extra_ies_len, u8 oper_class,
693 				       struct cfg80211_chan_def *chandef)
694 {
695 	struct ieee80211_tdls_data *tf;
696 	size_t offset = 0, noffset;
697 
698 	if (WARN_ON_ONCE(!chandef))
699 		return;
700 
701 	tf = (void *)skb->data;
702 	tf->u.chan_switch_req.target_channel =
703 		ieee80211_frequency_to_channel(chandef->chan->center_freq);
704 	tf->u.chan_switch_req.oper_class = oper_class;
705 
706 	if (extra_ies_len) {
707 		static const u8 before_lnkie[] = {
708 			WLAN_EID_SECONDARY_CHANNEL_OFFSET,
709 		};
710 		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
711 					     before_lnkie,
712 					     ARRAY_SIZE(before_lnkie),
713 					     offset);
714 		skb_put_data(skb, extra_ies + offset, noffset - offset);
715 		offset = noffset;
716 	}
717 
718 	ieee80211_tdls_add_link_ie(link, skb, peer, initiator);
719 
720 	/* add any remaining IEs */
721 	if (extra_ies_len) {
722 		noffset = extra_ies_len;
723 		skb_put_data(skb, extra_ies + offset, noffset - offset);
724 	}
725 }
726 
727 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)728 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_link_data *link,
729 					struct sk_buff *skb, const u8 *peer,
730 					u16 status_code, bool initiator,
731 					const u8 *extra_ies,
732 					size_t extra_ies_len)
733 {
734 	if (status_code == 0)
735 		ieee80211_tdls_add_link_ie(link, skb, peer, initiator);
736 
737 	if (extra_ies_len)
738 		skb_put_data(skb, extra_ies, extra_ies_len);
739 }
740 
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)741 static void ieee80211_tdls_add_ies(struct ieee80211_link_data *link,
742 				   struct sk_buff *skb, const u8 *peer,
743 				   u8 action_code, u16 status_code,
744 				   bool initiator, const u8 *extra_ies,
745 				   size_t extra_ies_len, u8 oper_class,
746 				   struct cfg80211_chan_def *chandef)
747 {
748 	switch (action_code) {
749 	case WLAN_TDLS_SETUP_REQUEST:
750 	case WLAN_TDLS_SETUP_RESPONSE:
751 	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
752 		if (status_code == 0)
753 			ieee80211_tdls_add_setup_start_ies(link,
754 							   skb, peer,
755 							   action_code,
756 							   initiator,
757 							   extra_ies,
758 							   extra_ies_len);
759 		break;
760 	case WLAN_TDLS_SETUP_CONFIRM:
761 		if (status_code == 0)
762 			ieee80211_tdls_add_setup_cfm_ies(link, skb, peer,
763 							 initiator, extra_ies,
764 							 extra_ies_len);
765 		break;
766 	case WLAN_TDLS_TEARDOWN:
767 	case WLAN_TDLS_DISCOVERY_REQUEST:
768 		if (extra_ies_len)
769 			skb_put_data(skb, extra_ies, extra_ies_len);
770 		if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
771 			ieee80211_tdls_add_link_ie(link, skb,
772 						   peer, initiator);
773 		break;
774 	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
775 		ieee80211_tdls_add_chan_switch_req_ies(link, skb, peer,
776 						       initiator, extra_ies,
777 						       extra_ies_len,
778 						       oper_class, chandef);
779 		break;
780 	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
781 		ieee80211_tdls_add_chan_switch_resp_ies(link, skb, peer,
782 							status_code,
783 							initiator, extra_ies,
784 							extra_ies_len);
785 		break;
786 	}
787 
788 }
789 
790 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)791 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
792 			       struct ieee80211_link_data *link,
793 			       const u8 *peer, u8 action_code, u8 dialog_token,
794 			       u16 status_code, struct sk_buff *skb)
795 {
796 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
797 	struct ieee80211_tdls_data *tf;
798 
799 	tf = skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
800 
801 	memcpy(tf->da, peer, ETH_ALEN);
802 	memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
803 	tf->ether_type = cpu_to_be16(ETH_P_TDLS);
804 	tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
805 
806 	/* network header is after the ethernet header */
807 	skb_set_network_header(skb, ETH_HLEN);
808 
809 	switch (action_code) {
810 	case WLAN_TDLS_SETUP_REQUEST:
811 		tf->category = WLAN_CATEGORY_TDLS;
812 		tf->action_code = WLAN_TDLS_SETUP_REQUEST;
813 
814 		skb_put(skb, sizeof(tf->u.setup_req));
815 		tf->u.setup_req.dialog_token = dialog_token;
816 		tf->u.setup_req.capability =
817 			cpu_to_le16(ieee80211_get_tdls_sta_capab(link,
818 								 status_code));
819 		break;
820 	case WLAN_TDLS_SETUP_RESPONSE:
821 		tf->category = WLAN_CATEGORY_TDLS;
822 		tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
823 
824 		skb_put(skb, sizeof(tf->u.setup_resp));
825 		tf->u.setup_resp.status_code = cpu_to_le16(status_code);
826 		tf->u.setup_resp.dialog_token = dialog_token;
827 		tf->u.setup_resp.capability =
828 			cpu_to_le16(ieee80211_get_tdls_sta_capab(link,
829 								 status_code));
830 		break;
831 	case WLAN_TDLS_SETUP_CONFIRM:
832 		tf->category = WLAN_CATEGORY_TDLS;
833 		tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
834 
835 		skb_put(skb, sizeof(tf->u.setup_cfm));
836 		tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
837 		tf->u.setup_cfm.dialog_token = dialog_token;
838 		break;
839 	case WLAN_TDLS_TEARDOWN:
840 		tf->category = WLAN_CATEGORY_TDLS;
841 		tf->action_code = WLAN_TDLS_TEARDOWN;
842 
843 		skb_put(skb, sizeof(tf->u.teardown));
844 		tf->u.teardown.reason_code = cpu_to_le16(status_code);
845 		break;
846 	case WLAN_TDLS_DISCOVERY_REQUEST:
847 		tf->category = WLAN_CATEGORY_TDLS;
848 		tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
849 
850 		skb_put(skb, sizeof(tf->u.discover_req));
851 		tf->u.discover_req.dialog_token = dialog_token;
852 		break;
853 	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
854 		tf->category = WLAN_CATEGORY_TDLS;
855 		tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
856 
857 		skb_put(skb, sizeof(tf->u.chan_switch_req));
858 		break;
859 	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
860 		tf->category = WLAN_CATEGORY_TDLS;
861 		tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
862 
863 		skb_put(skb, sizeof(tf->u.chan_switch_resp));
864 		tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
865 		break;
866 	default:
867 		return -EINVAL;
868 	}
869 
870 	return 0;
871 }
872 
873 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)874 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
875 			   const u8 *peer, struct ieee80211_link_data *link,
876 			   u8 action_code, u8 dialog_token,
877 			   u16 status_code, struct sk_buff *skb)
878 {
879 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
880 	struct ieee80211_mgmt *mgmt;
881 
882 	mgmt = skb_put_zero(skb, 24);
883 	memcpy(mgmt->da, peer, ETH_ALEN);
884 	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
885 	memcpy(mgmt->bssid, link->u.mgd.bssid, ETH_ALEN);
886 	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
887 					  IEEE80211_STYPE_ACTION);
888 
889 	switch (action_code) {
890 	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
891 		skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
892 		mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
893 		mgmt->u.action.u.tdls_discover_resp.action_code =
894 			WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
895 		mgmt->u.action.u.tdls_discover_resp.dialog_token =
896 			dialog_token;
897 		mgmt->u.action.u.tdls_discover_resp.capability =
898 			cpu_to_le16(ieee80211_get_tdls_sta_capab(link,
899 								 status_code));
900 		break;
901 	default:
902 		return -EINVAL;
903 	}
904 
905 	return 0;
906 }
907 
908 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)909 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
910 				      const u8 *peer, int link_id,
911 				      u8 action_code, u8 dialog_token,
912 				      u16 status_code, bool initiator,
913 				      const u8 *extra_ies, size_t extra_ies_len,
914 				      u8 oper_class,
915 				      struct cfg80211_chan_def *chandef)
916 {
917 	struct ieee80211_local *local = sdata->local;
918 	struct sk_buff *skb;
919 	int ret;
920 	struct ieee80211_link_data *link;
921 
922 	link_id = link_id >= 0 ? link_id : 0;
923 	rcu_read_lock();
924 	link = rcu_dereference(sdata->link[link_id]);
925 	if (WARN_ON(!link))
926 		goto unlock;
927 
928 	skb = netdev_alloc_skb(sdata->dev,
929 			       local->hw.extra_tx_headroom +
930 			       max(sizeof(struct ieee80211_mgmt),
931 				   sizeof(struct ieee80211_tdls_data)) +
932 			       50 + /* supported rates */
933 			       10 + /* ext capab */
934 			       26 + /* max(WMM-info, WMM-param) */
935 			       2 + max(sizeof(struct ieee80211_ht_cap),
936 				       sizeof(struct ieee80211_ht_operation)) +
937 			       2 + max(sizeof(struct ieee80211_vht_cap),
938 				       sizeof(struct ieee80211_vht_operation)) +
939 			       2 + 1 + sizeof(struct ieee80211_he_cap_elem) +
940 				       sizeof(struct ieee80211_he_mcs_nss_supp) +
941 				       IEEE80211_HE_PPE_THRES_MAX_LEN +
942 			       2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
943 			       2 + 1 + sizeof(struct ieee80211_eht_cap_elem) +
944 				       sizeof(struct ieee80211_eht_mcs_nss_supp) +
945 				       IEEE80211_EHT_PPE_THRES_MAX_LEN +
946 			       50 + /* supported channels */
947 			       3 + /* 40/20 BSS coex */
948 			       4 + /* AID */
949 			       4 + /* oper classes */
950 			       extra_ies_len +
951 			       sizeof(struct ieee80211_tdls_lnkie));
952 	if (!skb)
953 		goto unlock;
954 
955 	skb_reserve(skb, local->hw.extra_tx_headroom);
956 
957 	switch (action_code) {
958 	case WLAN_TDLS_SETUP_REQUEST:
959 	case WLAN_TDLS_SETUP_RESPONSE:
960 	case WLAN_TDLS_SETUP_CONFIRM:
961 	case WLAN_TDLS_TEARDOWN:
962 	case WLAN_TDLS_DISCOVERY_REQUEST:
963 	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
964 	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
965 		ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
966 						     sdata->dev, link, peer,
967 						     action_code, dialog_token,
968 						     status_code, skb);
969 		break;
970 	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
971 		ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
972 						 peer, link, action_code,
973 						 dialog_token, status_code,
974 						 skb);
975 		break;
976 	default:
977 		ret = -EOPNOTSUPP;
978 		break;
979 	}
980 
981 	if (ret < 0)
982 		goto fail;
983 
984 	ieee80211_tdls_add_ies(link, skb, peer, action_code, status_code,
985 			       initiator, extra_ies, extra_ies_len, oper_class,
986 			       chandef);
987 	rcu_read_unlock();
988 	return skb;
989 
990 fail:
991 	dev_kfree_skb(skb);
992 unlock:
993 	rcu_read_unlock();
994 	return NULL;
995 }
996 
997 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)998 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
999 				const u8 *peer, int link_id,
1000 				u8 action_code, u8 dialog_token,
1001 				u16 status_code, u32 peer_capability,
1002 				bool initiator, const u8 *extra_ies,
1003 				size_t extra_ies_len, u8 oper_class,
1004 				struct cfg80211_chan_def *chandef)
1005 {
1006 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1007 	struct sk_buff *skb = NULL;
1008 	struct sta_info *sta;
1009 	u32 flags = 0;
1010 	int ret = 0;
1011 
1012 	rcu_read_lock();
1013 	sta = sta_info_get(sdata, peer);
1014 
1015 	/* infer the initiator if we can, to support old userspace */
1016 	switch (action_code) {
1017 	case WLAN_TDLS_SETUP_REQUEST:
1018 		if (sta) {
1019 			set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
1020 			sta->sta.tdls_initiator = false;
1021 		}
1022 		fallthrough;
1023 	case WLAN_TDLS_SETUP_CONFIRM:
1024 	case WLAN_TDLS_DISCOVERY_REQUEST:
1025 		initiator = true;
1026 		break;
1027 	case WLAN_TDLS_SETUP_RESPONSE:
1028 		/*
1029 		 * In some testing scenarios, we send a request and response.
1030 		 * Make the last packet sent take effect for the initiator
1031 		 * value.
1032 		 */
1033 		if (sta) {
1034 			clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
1035 			sta->sta.tdls_initiator = true;
1036 		}
1037 		fallthrough;
1038 	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1039 		initiator = false;
1040 		break;
1041 	case WLAN_TDLS_TEARDOWN:
1042 	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1043 	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1044 		/* any value is ok */
1045 		break;
1046 	default:
1047 		ret = -EOPNOTSUPP;
1048 		break;
1049 	}
1050 
1051 	if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
1052 		initiator = true;
1053 
1054 	rcu_read_unlock();
1055 	if (ret < 0)
1056 		goto fail;
1057 
1058 	skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer,
1059 						    link_id, action_code,
1060 						    dialog_token, status_code,
1061 						    initiator, extra_ies,
1062 						    extra_ies_len, oper_class,
1063 						    chandef);
1064 	if (!skb) {
1065 		ret = -EINVAL;
1066 		goto fail;
1067 	}
1068 
1069 	if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
1070 		ieee80211_tx_skb_tid(sdata, skb, 7, link_id);
1071 		return 0;
1072 	}
1073 
1074 	/*
1075 	 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1076 	 * we should default to AC_VI.
1077 	 */
1078 	switch (action_code) {
1079 	case WLAN_TDLS_SETUP_REQUEST:
1080 	case WLAN_TDLS_SETUP_RESPONSE:
1081 		skb->priority = 256 + 2;
1082 		break;
1083 	default:
1084 		skb->priority = 256 + 5;
1085 		break;
1086 	}
1087 
1088 	/*
1089 	 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1090 	 * Later, if no ACK is returned from peer, we will re-send the teardown
1091 	 * packet through the AP.
1092 	 */
1093 	if ((action_code == WLAN_TDLS_TEARDOWN) &&
1094 	    ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1095 		bool try_resend; /* Should we keep skb for possible resend */
1096 
1097 		/* If not sending directly to peer - no point in keeping skb */
1098 		rcu_read_lock();
1099 		sta = sta_info_get(sdata, peer);
1100 		try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1101 		rcu_read_unlock();
1102 
1103 		spin_lock_bh(&sdata->u.mgd.teardown_lock);
1104 		if (try_resend && !sdata->u.mgd.teardown_skb) {
1105 			/* Mark it as requiring TX status callback  */
1106 			flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1107 				 IEEE80211_TX_INTFL_MLME_CONN_TX;
1108 
1109 			/*
1110 			 * skb is copied since mac80211 will later set
1111 			 * properties that might not be the same as the AP,
1112 			 * such as encryption, QoS, addresses, etc.
1113 			 *
1114 			 * No problem if skb_copy() fails, so no need to check.
1115 			 */
1116 			sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1117 			sdata->u.mgd.orig_teardown_skb = skb;
1118 		}
1119 		spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1120 	}
1121 
1122 	/* disable bottom halves when entering the Tx path */
1123 	local_bh_disable();
1124 	__ieee80211_subif_start_xmit(skb, dev, flags,
1125 				     IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL);
1126 	local_bh_enable();
1127 
1128 	return ret;
1129 
1130 fail:
1131 	dev_kfree_skb(skb);
1132 	return ret;
1133 }
1134 
1135 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)1136 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1137 			  const u8 *peer, int link_id,
1138 			  u8 action_code, u8 dialog_token,
1139 			  u16 status_code, u32 peer_capability, bool initiator,
1140 			  const u8 *extra_ies, size_t extra_ies_len)
1141 {
1142 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1143 	struct ieee80211_local *local = sdata->local;
1144 	enum ieee80211_smps_mode smps_mode =
1145 		sdata->deflink.u.mgd.driver_smps_mode;
1146 	int ret;
1147 
1148 	/* don't support setup with forced SMPS mode that's not off */
1149 	if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1150 	    smps_mode != IEEE80211_SMPS_OFF) {
1151 		tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1152 			 smps_mode);
1153 		return -EOPNOTSUPP;
1154 	}
1155 
1156 	lockdep_assert_wiphy(local->hw.wiphy);
1157 
1158 	/* we don't support concurrent TDLS peer setups */
1159 	if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1160 	    !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1161 		ret = -EBUSY;
1162 		goto out_unlock;
1163 	}
1164 
1165 	/*
1166 	 * make sure we have a STA representing the peer so we drop or buffer
1167 	 * non-TDLS-setup frames to the peer. We can't send other packets
1168 	 * during setup through the AP path.
1169 	 * Allow error packets to be sent - sometimes we don't even add a STA
1170 	 * before failing the setup.
1171 	 */
1172 	if (status_code == 0) {
1173 		rcu_read_lock();
1174 		if (!sta_info_get(sdata, peer)) {
1175 			rcu_read_unlock();
1176 			ret = -ENOLINK;
1177 			goto out_unlock;
1178 		}
1179 		rcu_read_unlock();
1180 	}
1181 
1182 	ieee80211_flush_queues(local, sdata, false);
1183 	memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1184 
1185 	/* we cannot take the mutex while preparing the setup packet */
1186 	ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1187 					      link_id, action_code,
1188 					      dialog_token, status_code,
1189 					      peer_capability, initiator,
1190 					      extra_ies, extra_ies_len, 0,
1191 					      NULL);
1192 	if (ret < 0) {
1193 		eth_zero_addr(sdata->u.mgd.tdls_peer);
1194 		return ret;
1195 	}
1196 
1197 	wiphy_delayed_work_queue(sdata->local->hw.wiphy,
1198 				 &sdata->u.mgd.tdls_peer_del_work,
1199 				 TDLS_PEER_SETUP_TIMEOUT);
1200 	return 0;
1201 
1202 out_unlock:
1203 	return ret;
1204 }
1205 
1206 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)1207 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1208 			     const u8 *peer, int link_id,
1209 			     u8 action_code, u8 dialog_token,
1210 			     u16 status_code, u32 peer_capability,
1211 			     bool initiator, const u8 *extra_ies,
1212 			     size_t extra_ies_len)
1213 {
1214 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1215 	struct ieee80211_local *local = sdata->local;
1216 	struct sta_info *sta;
1217 	int ret;
1218 
1219 	/*
1220 	 * No packets can be transmitted to the peer via the AP during setup -
1221 	 * the STA is set as a TDLS peer, but is not authorized.
1222 	 * During teardown, we prevent direct transmissions by stopping the
1223 	 * queues and flushing all direct packets.
1224 	 */
1225 	ieee80211_stop_vif_queues(local, sdata,
1226 				  IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1227 	ieee80211_flush_queues(local, sdata, false);
1228 
1229 	ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1230 					      link_id, action_code,
1231 					      dialog_token, status_code,
1232 					      peer_capability, initiator,
1233 					      extra_ies, extra_ies_len, 0,
1234 					      NULL);
1235 	if (ret < 0)
1236 		sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1237 			  ret);
1238 
1239 	/*
1240 	 * Remove the STA AUTH flag to force further traffic through the AP. If
1241 	 * the STA was unreachable, it was already removed.
1242 	 */
1243 	rcu_read_lock();
1244 	sta = sta_info_get(sdata, peer);
1245 	if (sta)
1246 		clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1247 	rcu_read_unlock();
1248 
1249 	ieee80211_wake_vif_queues(local, sdata,
1250 				  IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1251 
1252 	return 0;
1253 }
1254 
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)1255 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1256 			const u8 *peer, int link_id,
1257 			u8 action_code, u8 dialog_token, u16 status_code,
1258 			u32 peer_capability, bool initiator,
1259 			const u8 *extra_ies, size_t extra_ies_len)
1260 {
1261 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1262 	int ret;
1263 
1264 	if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1265 		return -EOPNOTSUPP;
1266 
1267 	/* make sure we are in managed mode, and associated */
1268 	if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1269 	    !sdata->u.mgd.associated)
1270 		return -EINVAL;
1271 
1272 	switch (action_code) {
1273 	case WLAN_TDLS_SETUP_REQUEST:
1274 	case WLAN_TDLS_SETUP_RESPONSE:
1275 		ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer,
1276 						link_id, action_code,
1277 						dialog_token, status_code,
1278 						peer_capability, initiator,
1279 						extra_ies, extra_ies_len);
1280 		break;
1281 	case WLAN_TDLS_TEARDOWN:
1282 		ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, link_id,
1283 						   action_code, dialog_token,
1284 						   status_code,
1285 						   peer_capability, initiator,
1286 						   extra_ies, extra_ies_len);
1287 		break;
1288 	case WLAN_TDLS_DISCOVERY_REQUEST:
1289 		/*
1290 		 * Protect the discovery so we can hear the TDLS discovery
1291 		 * response frame. It is transmitted directly and not buffered
1292 		 * by the AP.
1293 		 */
1294 		drv_mgd_protect_tdls_discover(sdata->local, sdata, link_id);
1295 		fallthrough;
1296 	case WLAN_TDLS_SETUP_CONFIRM:
1297 	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1298 		/* no special handling */
1299 		ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1300 						      link_id, action_code,
1301 						      dialog_token,
1302 						      status_code,
1303 						      peer_capability,
1304 						      initiator, extra_ies,
1305 						      extra_ies_len, 0, NULL);
1306 		break;
1307 	default:
1308 		ret = -EOPNOTSUPP;
1309 		break;
1310 	}
1311 
1312 	tdls_dbg(sdata, "TDLS mgmt action %d peer %pM link_id %d status %d\n",
1313 		 action_code, peer, link_id, ret);
1314 	return ret;
1315 }
1316 
iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data * sdata,struct sta_info * sta)1317 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1318 					 struct sta_info *sta)
1319 {
1320 	struct ieee80211_local *local = sdata->local;
1321 	struct ieee80211_chanctx_conf *conf;
1322 	struct ieee80211_chanctx *ctx;
1323 	enum nl80211_chan_width width;
1324 	struct ieee80211_supported_band *sband;
1325 
1326 	lockdep_assert_wiphy(local->hw.wiphy);
1327 
1328 	conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf,
1329 					 lockdep_is_held(&local->hw.wiphy->mtx));
1330 	if (conf) {
1331 		width = conf->def.width;
1332 		sband = local->hw.wiphy->bands[conf->def.chan->band];
1333 		ctx = container_of(conf, struct ieee80211_chanctx, conf);
1334 		ieee80211_recalc_chanctx_chantype(local, ctx);
1335 
1336 		/* if width changed and a peer is given, update its BW */
1337 		if (width != conf->def.width && sta &&
1338 		    test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1339 			enum ieee80211_sta_rx_bandwidth bw;
1340 
1341 			bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1342 			bw = min(bw, ieee80211_sta_cap_rx_bw(&sta->deflink));
1343 			if (bw != sta->sta.deflink.bandwidth) {
1344 				sta->sta.deflink.bandwidth = bw;
1345 				rate_control_rate_update(local, sband, sta, 0,
1346 							 IEEE80211_RC_BW_CHANGED);
1347 				/*
1348 				 * if a TDLS peer BW was updated, we need to
1349 				 * recalc the chandef width again, to get the
1350 				 * correct chanctx min_def
1351 				 */
1352 				ieee80211_recalc_chanctx_chantype(local, ctx);
1353 			}
1354 		}
1355 
1356 	}
1357 }
1358 
iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data * sdata)1359 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1360 {
1361 	struct sta_info *sta;
1362 	bool result = false;
1363 
1364 	rcu_read_lock();
1365 	list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1366 		if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1367 		    !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1368 		    !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1369 		    !sta->sta.deflink.ht_cap.ht_supported)
1370 			continue;
1371 		result = true;
1372 		break;
1373 	}
1374 	rcu_read_unlock();
1375 
1376 	return result;
1377 }
1378 
1379 static void
iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data * sdata,struct sta_info * sta)1380 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1381 				   struct sta_info *sta)
1382 {
1383 	bool tdls_ht;
1384 	u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1385 			 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1386 			 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1387 	u16 opmode;
1388 
1389 	/* Nothing to do if the BSS connection uses (at least) HT */
1390 	if (sdata->deflink.u.mgd.conn.mode >= IEEE80211_CONN_MODE_HT)
1391 		return;
1392 
1393 	tdls_ht = (sta && sta->sta.deflink.ht_cap.ht_supported) ||
1394 		  iee80211_tdls_have_ht_peers(sdata);
1395 
1396 	opmode = sdata->vif.bss_conf.ht_operation_mode;
1397 
1398 	if (tdls_ht)
1399 		opmode |= protection;
1400 	else
1401 		opmode &= ~protection;
1402 
1403 	if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1404 		return;
1405 
1406 	sdata->vif.bss_conf.ht_operation_mode = opmode;
1407 	ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1408 					  BSS_CHANGED_HT);
1409 }
1410 
ieee80211_tdls_oper(struct wiphy * wiphy,struct net_device * dev,const u8 * peer,enum nl80211_tdls_operation oper)1411 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1412 			const u8 *peer, enum nl80211_tdls_operation oper)
1413 {
1414 	struct sta_info *sta;
1415 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1416 	struct ieee80211_local *local = sdata->local;
1417 	int ret;
1418 
1419 	lockdep_assert_wiphy(local->hw.wiphy);
1420 
1421 	if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1422 		return -EOPNOTSUPP;
1423 
1424 	if (sdata->vif.type != NL80211_IFTYPE_STATION)
1425 		return -EINVAL;
1426 
1427 	switch (oper) {
1428 	case NL80211_TDLS_ENABLE_LINK:
1429 	case NL80211_TDLS_DISABLE_LINK:
1430 		break;
1431 	case NL80211_TDLS_TEARDOWN:
1432 	case NL80211_TDLS_SETUP:
1433 	case NL80211_TDLS_DISCOVERY_REQ:
1434 		/* We don't support in-driver setup/teardown/discovery */
1435 		return -EOPNOTSUPP;
1436 	}
1437 
1438 	/* protect possible bss_conf changes and avoid concurrency in
1439 	 * ieee80211_bss_info_change_notify()
1440 	 */
1441 	tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1442 
1443 	switch (oper) {
1444 	case NL80211_TDLS_ENABLE_LINK:
1445 		if (sdata->vif.bss_conf.csa_active) {
1446 			tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1447 			return -EBUSY;
1448 		}
1449 
1450 		sta = sta_info_get(sdata, peer);
1451 		if (!sta)
1452 			return -ENOLINK;
1453 
1454 		iee80211_tdls_recalc_chanctx(sdata, sta);
1455 		iee80211_tdls_recalc_ht_protection(sdata, sta);
1456 
1457 		set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1458 
1459 		WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1460 			     !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1461 		break;
1462 	case NL80211_TDLS_DISABLE_LINK:
1463 		/*
1464 		 * The teardown message in ieee80211_tdls_mgmt_teardown() was
1465 		 * created while the queues were stopped, so it might still be
1466 		 * pending. Before flushing the queues we need to be sure the
1467 		 * message is handled by the tasklet handling pending messages,
1468 		 * otherwise we might start destroying the station before
1469 		 * sending the teardown packet.
1470 		 * Note that this only forces the tasklet to flush pendings -
1471 		 * not to stop the tasklet from rescheduling itself.
1472 		 */
1473 		tasklet_kill(&local->tx_pending_tasklet);
1474 		/* flush a potentially queued teardown packet */
1475 		ieee80211_flush_queues(local, sdata, false);
1476 
1477 		ret = sta_info_destroy_addr(sdata, peer);
1478 
1479 		iee80211_tdls_recalc_ht_protection(sdata, NULL);
1480 
1481 		iee80211_tdls_recalc_chanctx(sdata, NULL);
1482 		if (ret)
1483 			return ret;
1484 		break;
1485 	default:
1486 		return -EOPNOTSUPP;
1487 	}
1488 
1489 	if (ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1490 		wiphy_delayed_work_cancel(sdata->local->hw.wiphy,
1491 					  &sdata->u.mgd.tdls_peer_del_work);
1492 		eth_zero_addr(sdata->u.mgd.tdls_peer);
1493 	}
1494 
1495 	wiphy_work_queue(sdata->local->hw.wiphy,
1496 			 &sdata->deflink.u.mgd.request_smps_work);
1497 
1498 	return 0;
1499 }
1500 
ieee80211_tdls_oper_request(struct ieee80211_vif * vif,const u8 * peer,enum nl80211_tdls_operation oper,u16 reason_code,gfp_t gfp)1501 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1502 				 enum nl80211_tdls_operation oper,
1503 				 u16 reason_code, gfp_t gfp)
1504 {
1505 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1506 
1507 	if (vif->type != NL80211_IFTYPE_STATION || !vif->cfg.assoc) {
1508 		sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1509 			  oper);
1510 		return;
1511 	}
1512 
1513 	cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1514 }
1515 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1516 
1517 static void
iee80211_tdls_add_ch_switch_timing(u8 * buf,u16 switch_time,u16 switch_timeout)1518 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1519 {
1520 	struct ieee80211_ch_switch_timing *ch_sw;
1521 
1522 	*buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1523 	*buf++ = sizeof(struct ieee80211_ch_switch_timing);
1524 
1525 	ch_sw = (void *)buf;
1526 	ch_sw->switch_time = cpu_to_le16(switch_time);
1527 	ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1528 }
1529 
1530 /* find switch timing IE in SKB ready for Tx */
ieee80211_tdls_find_sw_timing_ie(struct sk_buff * skb)1531 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1532 {
1533 	struct ieee80211_tdls_data *tf;
1534 	const u8 *ie_start;
1535 
1536 	/*
1537 	 * Get the offset for the new location of the switch timing IE.
1538 	 * The SKB network header will now point to the "payload_type"
1539 	 * element of the TDLS data frame struct.
1540 	 */
1541 	tf = container_of(skb->data + skb_network_offset(skb),
1542 			  struct ieee80211_tdls_data, payload_type);
1543 	ie_start = tf->u.chan_switch_req.variable;
1544 	return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1545 				skb->len - (ie_start - skb->data));
1546 }
1547 
1548 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)1549 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1550 			      struct cfg80211_chan_def *chandef,
1551 			      u32 *ch_sw_tm_ie_offset)
1552 {
1553 	struct ieee80211_sub_if_data *sdata = sta->sdata;
1554 	u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1555 		     2 + sizeof(struct ieee80211_ch_switch_timing)];
1556 	int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1557 	u8 *pos = extra_ies;
1558 	struct sk_buff *skb;
1559 	int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0;
1560 
1561 	/*
1562 	 * if chandef points to a wide channel add a Secondary-Channel
1563 	 * Offset information element
1564 	 */
1565 	if (chandef->width == NL80211_CHAN_WIDTH_40) {
1566 		struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1567 		bool ht40plus;
1568 
1569 		*pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1570 		*pos++ = sizeof(*sec_chan_ie);
1571 		sec_chan_ie = (void *)pos;
1572 
1573 		ht40plus = cfg80211_get_chandef_type(chandef) ==
1574 							NL80211_CHAN_HT40PLUS;
1575 		sec_chan_ie->sec_chan_offs = ht40plus ?
1576 					     IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1577 					     IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1578 		pos += sizeof(*sec_chan_ie);
1579 
1580 		extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1581 	}
1582 
1583 	/* just set the values to 0, this is a template */
1584 	iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1585 
1586 	skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1587 					      link_id,
1588 					      WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1589 					      0, 0, !sta->sta.tdls_initiator,
1590 					      extra_ies, extra_ies_len,
1591 					      oper_class, chandef);
1592 	if (!skb)
1593 		return NULL;
1594 
1595 	skb = ieee80211_build_data_template(sdata, skb, 0);
1596 	if (IS_ERR(skb)) {
1597 		tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1598 		return NULL;
1599 	}
1600 
1601 	if (ch_sw_tm_ie_offset) {
1602 		const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1603 
1604 		if (!tm_ie) {
1605 			tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1606 			dev_kfree_skb_any(skb);
1607 			return NULL;
1608 		}
1609 
1610 		*ch_sw_tm_ie_offset = tm_ie - skb->data;
1611 	}
1612 
1613 	tdls_dbg(sdata,
1614 		 "TDLS channel switch request template for %pM ch %d width %d\n",
1615 		 sta->sta.addr, chandef->chan->center_freq, chandef->width);
1616 	return skb;
1617 }
1618 
1619 int
ieee80211_tdls_channel_switch(struct wiphy * wiphy,struct net_device * dev,const u8 * addr,u8 oper_class,struct cfg80211_chan_def * chandef)1620 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1621 			      const u8 *addr, u8 oper_class,
1622 			      struct cfg80211_chan_def *chandef)
1623 {
1624 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1625 	struct ieee80211_local *local = sdata->local;
1626 	struct sta_info *sta;
1627 	struct sk_buff *skb = NULL;
1628 	u32 ch_sw_tm_ie;
1629 	int ret;
1630 
1631 	lockdep_assert_wiphy(local->hw.wiphy);
1632 
1633 	if (chandef->chan->freq_offset)
1634 		/* this may work, but is untested */
1635 		return -EOPNOTSUPP;
1636 
1637 	sta = sta_info_get(sdata, addr);
1638 	if (!sta) {
1639 		tdls_dbg(sdata,
1640 			 "Invalid TDLS peer %pM for channel switch request\n",
1641 			 addr);
1642 		ret = -ENOENT;
1643 		goto out;
1644 	}
1645 
1646 	if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1647 		tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1648 			 addr);
1649 		ret = -EOPNOTSUPP;
1650 		goto out;
1651 	}
1652 
1653 	skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1654 					    &ch_sw_tm_ie);
1655 	if (!skb) {
1656 		ret = -ENOENT;
1657 		goto out;
1658 	}
1659 
1660 	ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1661 				      chandef, skb, ch_sw_tm_ie);
1662 	if (!ret)
1663 		set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1664 
1665 out:
1666 	dev_kfree_skb_any(skb);
1667 	return ret;
1668 }
1669 
1670 void
ieee80211_tdls_cancel_channel_switch(struct wiphy * wiphy,struct net_device * dev,const u8 * addr)1671 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1672 				     struct net_device *dev,
1673 				     const u8 *addr)
1674 {
1675 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1676 	struct ieee80211_local *local = sdata->local;
1677 	struct sta_info *sta;
1678 
1679 	lockdep_assert_wiphy(local->hw.wiphy);
1680 
1681 	sta = sta_info_get(sdata, addr);
1682 	if (!sta) {
1683 		tdls_dbg(sdata,
1684 			 "Invalid TDLS peer %pM for channel switch cancel\n",
1685 			 addr);
1686 		return;
1687 	}
1688 
1689 	if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1690 		tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1691 			 addr);
1692 		return;
1693 	}
1694 
1695 	drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1696 	clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1697 }
1698 
1699 static struct sk_buff *
ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info * sta,u32 * ch_sw_tm_ie_offset)1700 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1701 				   u32 *ch_sw_tm_ie_offset)
1702 {
1703 	struct ieee80211_sub_if_data *sdata = sta->sdata;
1704 	struct sk_buff *skb;
1705 	u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1706 	int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0;
1707 
1708 	/* initial timing are always zero in the template */
1709 	iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1710 
1711 	skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1712 					link_id,
1713 					WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1714 					0, 0, !sta->sta.tdls_initiator,
1715 					extra_ies, sizeof(extra_ies), 0, NULL);
1716 	if (!skb)
1717 		return NULL;
1718 
1719 	skb = ieee80211_build_data_template(sdata, skb, 0);
1720 	if (IS_ERR(skb)) {
1721 		tdls_dbg(sdata,
1722 			 "Failed building TDLS channel switch resp frame\n");
1723 		return NULL;
1724 	}
1725 
1726 	if (ch_sw_tm_ie_offset) {
1727 		const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1728 
1729 		if (!tm_ie) {
1730 			tdls_dbg(sdata,
1731 				 "No switch timing IE in TDLS switch resp\n");
1732 			dev_kfree_skb_any(skb);
1733 			return NULL;
1734 		}
1735 
1736 		*ch_sw_tm_ie_offset = tm_ie - skb->data;
1737 	}
1738 
1739 	tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1740 		 sta->sta.addr);
1741 	return skb;
1742 }
1743 
1744 static int
ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1745 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1746 					   struct sk_buff *skb)
1747 {
1748 	struct ieee80211_local *local = sdata->local;
1749 	struct ieee802_11_elems *elems = NULL;
1750 	struct sta_info *sta;
1751 	struct ieee80211_tdls_data *tf = (void *)skb->data;
1752 	bool local_initiator;
1753 	struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1754 	int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1755 	struct ieee80211_tdls_ch_sw_params params = {};
1756 	int ret;
1757 
1758 	lockdep_assert_wiphy(local->hw.wiphy);
1759 
1760 	params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1761 	params.timestamp = rx_status->device_timestamp;
1762 
1763 	if (skb->len < baselen) {
1764 		tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1765 			 skb->len);
1766 		return -EINVAL;
1767 	}
1768 
1769 	sta = sta_info_get(sdata, tf->sa);
1770 	if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1771 		tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1772 			 tf->sa);
1773 		ret = -EINVAL;
1774 		goto out;
1775 	}
1776 
1777 	params.sta = &sta->sta;
1778 	params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1779 	if (params.status != 0) {
1780 		ret = 0;
1781 		goto call_drv;
1782 	}
1783 
1784 	elems = ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1785 				       skb->len - baselen, false, NULL);
1786 	if (!elems) {
1787 		ret = -ENOMEM;
1788 		goto out;
1789 	}
1790 
1791 	if (elems->parse_error) {
1792 		tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1793 		ret = -EINVAL;
1794 		goto out;
1795 	}
1796 
1797 	if (!elems->ch_sw_timing || !elems->lnk_id) {
1798 		tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1799 		ret = -EINVAL;
1800 		goto out;
1801 	}
1802 
1803 	/* validate the initiator is set correctly */
1804 	local_initiator =
1805 		!memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1806 	if (local_initiator == sta->sta.tdls_initiator) {
1807 		tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1808 		ret = -EINVAL;
1809 		goto out;
1810 	}
1811 
1812 	params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time);
1813 	params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout);
1814 
1815 	params.tmpl_skb =
1816 		ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1817 	if (!params.tmpl_skb) {
1818 		ret = -ENOENT;
1819 		goto out;
1820 	}
1821 
1822 	ret = 0;
1823 call_drv:
1824 	drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1825 
1826 	tdls_dbg(sdata,
1827 		 "TDLS channel switch response received from %pM status %d\n",
1828 		 tf->sa, params.status);
1829 
1830 out:
1831 	dev_kfree_skb_any(params.tmpl_skb);
1832 	kfree(elems);
1833 	return ret;
1834 }
1835 
1836 static int
ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1837 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1838 					  struct sk_buff *skb)
1839 {
1840 	struct ieee80211_local *local = sdata->local;
1841 	struct ieee802_11_elems *elems;
1842 	struct cfg80211_chan_def chandef;
1843 	struct ieee80211_channel *chan;
1844 	enum nl80211_channel_type chan_type;
1845 	int freq;
1846 	u8 target_channel, oper_class;
1847 	bool local_initiator;
1848 	struct sta_info *sta;
1849 	enum nl80211_band band;
1850 	struct ieee80211_tdls_data *tf = (void *)skb->data;
1851 	struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1852 	int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1853 	struct ieee80211_tdls_ch_sw_params params = {};
1854 	int ret = 0;
1855 
1856 	lockdep_assert_wiphy(local->hw.wiphy);
1857 
1858 	params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1859 	params.timestamp = rx_status->device_timestamp;
1860 
1861 	if (skb->len < baselen) {
1862 		tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1863 			 skb->len);
1864 		return -EINVAL;
1865 	}
1866 
1867 	target_channel = tf->u.chan_switch_req.target_channel;
1868 	oper_class = tf->u.chan_switch_req.oper_class;
1869 
1870 	/*
1871 	 * We can't easily infer the channel band. The operating class is
1872 	 * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1873 	 * solution here is to treat channels with number >14 as 5GHz ones,
1874 	 * and specifically check for the (oper_class, channel) combinations
1875 	 * where this doesn't hold. These are thankfully unique according to
1876 	 * IEEE802.11-2012.
1877 	 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1878 	 * valid here.
1879 	 */
1880 	if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1881 	     oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1882 	     target_channel < 14)
1883 		band = NL80211_BAND_5GHZ;
1884 	else
1885 		band = target_channel < 14 ? NL80211_BAND_2GHZ :
1886 					     NL80211_BAND_5GHZ;
1887 
1888 	freq = ieee80211_channel_to_frequency(target_channel, band);
1889 	if (freq == 0) {
1890 		tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1891 			 target_channel);
1892 		return -EINVAL;
1893 	}
1894 
1895 	chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1896 	if (!chan) {
1897 		tdls_dbg(sdata,
1898 			 "Unsupported channel for TDLS chan switch: %d\n",
1899 			 target_channel);
1900 		return -EINVAL;
1901 	}
1902 
1903 	elems = ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1904 				       skb->len - baselen, false, NULL);
1905 	if (!elems)
1906 		return -ENOMEM;
1907 
1908 	if (elems->parse_error) {
1909 		tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1910 		ret = -EINVAL;
1911 		goto free;
1912 	}
1913 
1914 	if (!elems->ch_sw_timing || !elems->lnk_id) {
1915 		tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1916 		ret = -EINVAL;
1917 		goto free;
1918 	}
1919 
1920 	if (!elems->sec_chan_offs) {
1921 		chan_type = NL80211_CHAN_HT20;
1922 	} else {
1923 		switch (elems->sec_chan_offs->sec_chan_offs) {
1924 		case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1925 			chan_type = NL80211_CHAN_HT40PLUS;
1926 			break;
1927 		case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1928 			chan_type = NL80211_CHAN_HT40MINUS;
1929 			break;
1930 		default:
1931 			chan_type = NL80211_CHAN_HT20;
1932 			break;
1933 		}
1934 	}
1935 
1936 	cfg80211_chandef_create(&chandef, chan, chan_type);
1937 
1938 	/* we will be active on the TDLS link */
1939 	if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1940 					   sdata->wdev.iftype)) {
1941 		tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1942 		ret = -EINVAL;
1943 		goto free;
1944 	}
1945 
1946 	sta = sta_info_get(sdata, tf->sa);
1947 	if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1948 		tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1949 			 tf->sa);
1950 		ret = -EINVAL;
1951 		goto out;
1952 	}
1953 
1954 	params.sta = &sta->sta;
1955 
1956 	/* validate the initiator is set correctly */
1957 	local_initiator =
1958 		!memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1959 	if (local_initiator == sta->sta.tdls_initiator) {
1960 		tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1961 		ret = -EINVAL;
1962 		goto out;
1963 	}
1964 
1965 	/* peer should have known better */
1966 	if (!sta->sta.deflink.ht_cap.ht_supported && elems->sec_chan_offs &&
1967 	    elems->sec_chan_offs->sec_chan_offs) {
1968 		tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1969 		ret = -EOPNOTSUPP;
1970 		goto out;
1971 	}
1972 
1973 	params.chandef = &chandef;
1974 	params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time);
1975 	params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout);
1976 
1977 	params.tmpl_skb =
1978 		ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1979 						   &params.ch_sw_tm_ie);
1980 	if (!params.tmpl_skb) {
1981 		ret = -ENOENT;
1982 		goto out;
1983 	}
1984 
1985 	drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1986 
1987 	tdls_dbg(sdata,
1988 		 "TDLS ch switch request received from %pM ch %d width %d\n",
1989 		 tf->sa, params.chandef->chan->center_freq,
1990 		 params.chandef->width);
1991 out:
1992 	dev_kfree_skb_any(params.tmpl_skb);
1993 free:
1994 	kfree(elems);
1995 	return ret;
1996 }
1997 
1998 void
ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1999 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
2000 				      struct sk_buff *skb)
2001 {
2002 	struct ieee80211_tdls_data *tf = (void *)skb->data;
2003 	struct wiphy *wiphy = sdata->local->hw.wiphy;
2004 
2005 	lockdep_assert_wiphy(wiphy);
2006 
2007 	/* make sure the driver supports it */
2008 	if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
2009 		return;
2010 
2011 	/* we want to access the entire packet */
2012 	if (skb_linearize(skb))
2013 		return;
2014 	/*
2015 	 * The packet/size was already validated by mac80211 Rx path, only look
2016 	 * at the action type.
2017 	 */
2018 	switch (tf->action_code) {
2019 	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
2020 		ieee80211_process_tdls_channel_switch_req(sdata, skb);
2021 		break;
2022 	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
2023 		ieee80211_process_tdls_channel_switch_resp(sdata, skb);
2024 		break;
2025 	default:
2026 		WARN_ON_ONCE(1);
2027 		return;
2028 	}
2029 }
2030 
ieee80211_teardown_tdls_peers(struct ieee80211_link_data * link)2031 void ieee80211_teardown_tdls_peers(struct ieee80211_link_data *link)
2032 {
2033 	struct ieee80211_sub_if_data *sdata = link->sdata;
2034 	struct sta_info *sta;
2035 	u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
2036 
2037 	rcu_read_lock();
2038 	list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
2039 		if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
2040 		    !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2041 			continue;
2042 
2043 		if (sta->deflink.link_id != link->link_id)
2044 			continue;
2045 
2046 		ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
2047 					    NL80211_TDLS_TEARDOWN, reason,
2048 					    GFP_ATOMIC);
2049 	}
2050 	rcu_read_unlock();
2051 }
2052 
ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data * sdata,const u8 * peer,u16 reason)2053 void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata,
2054 				      const u8 *peer, u16 reason)
2055 {
2056 	struct ieee80211_sta *sta;
2057 
2058 	rcu_read_lock();
2059 	sta = ieee80211_find_sta(&sdata->vif, peer);
2060 	if (!sta || !sta->tdls) {
2061 		rcu_read_unlock();
2062 		return;
2063 	}
2064 	rcu_read_unlock();
2065 
2066 	tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n",
2067 		 peer, reason,
2068 		 ieee80211_get_reason_code_string(reason));
2069 
2070 	ieee80211_tdls_oper_request(&sdata->vif, peer,
2071 				    NL80211_TDLS_TEARDOWN,
2072 				    WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE,
2073 				    GFP_ATOMIC);
2074 }
2075