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
24void 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(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, addr: sdata->u.mgd.tdls_peer);
38 eth_zero_addr(addr: sdata->u.mgd.tdls_peer);
39 }
40}
41
42static 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, len: 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
71static u8
72ieee80211_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(wiphy: sdata->local->hw.wiphy, freq: i);
87 if (ch) {
88 /* we will be active on the channel */
89 cfg80211_chandef_create(chandef: &chandef, channel: ch,
90 chantype: NL80211_CHAN_NO_HT);
91 if (cfg80211_reg_can_beacon_relax(wiphy, chandef: &chandef,
92 iftype: 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, len: 2);
108 *pos++ = ieee80211_frequency_to_channel(freq: 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, len: 2);
119 *pos++ = ieee80211_frequency_to_channel(freq: subband_start);
120 *pos++ = ch_cnt;
121
122 subband_cnt++;
123 }
124
125 return subband_cnt;
126}
127
128static void
129ieee80211_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, len: 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, start: 2412, end: 2472, spacing: 5);
148
149 /* 5GHz, with 20MHz spacing */
150 subband_cnt += ieee80211_tdls_add_subband(sdata, skb, start: 5000, end: 5825, spacing: 20);
151
152 /* length */
153 *pos = 2 * subband_cnt;
154}
155
156static 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(chandef: &link->conf->chanreq.oper,
163 op_class: &op_class))
164 return;
165
166 pos = skb_put(skb, len: 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
174static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
175{
176 u8 *pos = skb_put(skb, len: 3);
177
178 *pos++ = WLAN_EID_BSS_COEX_2040;
179 *pos++ = 1; /* len */
180
181 *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
182}
183
184static 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
203static 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, len: 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(to: lnkid->bssid, from: link->u.mgd.bssid, ETH_ALEN);
225 memcpy(to: lnkid->init_sta, from: init_addr, ETH_ALEN);
226 memcpy(to: lnkid->resp_sta, from: rsp_addr, ETH_ALEN);
227}
228
229static void
230ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
231{
232 u8 *pos = skb_put(skb, len: 4);
233
234 *pos++ = WLAN_EID_AID;
235 *pos++ = 2; /* len */
236 put_unaligned_le16(val: sdata->vif.cfg.aid, p: pos);
237}
238
239/* translate numbering in the WMM parameter IE to the mac80211 notation */
240static 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
257static 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
268static 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
274static 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, len: 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(ac: i)];
300 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(aifsn: txq->aifs,
301 acm: txq->acm, aci: i);
302 wmm->ac[i].cw = ieee80211_wmm_ecw(cw_min: txq->cw_min, cw_max: txq->cw_max);
303 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
304 }
305}
306
307static void
308ieee80211_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(link_sta: &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(wiphy: sdata->local->hw.wiphy, chandef: &uc,
349 iftype: sdata->wdev.iftype)))
350 ieee80211_chandef_downgrade(chandef: &uc, NULL);
351
352 if (!cfg80211_chandef_identical(chandef1: &uc, chandef2: &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
364static void
365ieee80211_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, basic_rates: 0, masked_rates: 0, element_id: WLAN_EID_SUPP_RATES);
386 ieee80211_put_srates_elem(skb, sband, basic_rates: 0, masked_rates: 0, element_id: 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(ies: extra_ies, ielen: extra_ies_len,
399 ids: before_ext_cap,
400 ARRAY_SIZE(before_ext_cap),
401 offset);
402 skb_put_data(skb, data: extra_ies + offset, len: 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(buf: skb_put(skb, len: 9), qosinfo: 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(ies: extra_ies, ielen: extra_ies_len,
428 ids: before_ht_cap,
429 ARRAY_SIZE(before_ht_cap),
430 offset);
431 skb_put_data(skb, data: extra_ies + offset, len: 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, addr: 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(to: &ht_cap, from: &sband->ht_cap, len: 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: &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, len: sizeof(struct ieee80211_ht_cap) + 2);
463 ieee80211_ie_build_ht_cap(pos, ht_cap: &ht_cap, 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(to: &ht_cap, from: &sta->sta.deflink.ht_cap, len: sizeof(ht_cap));
468
469 pos = skb_put(skb, len: sizeof(struct ieee80211_ht_cap) + 2);
470 ieee80211_ie_build_ht_cap(pos, ht_cap: &ht_cap, 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(ies: extra_ies, ielen: extra_ies_len,
495 ids: before_vht_cap,
496 ARRAY_SIZE(before_vht_cap),
497 offset);
498 skb_put_data(skb, data: extra_ies + offset, len: noffset - offset);
499 offset = noffset;
500 }
501
502 /* add AID if VHT, HE or EHT capabilities supported */
503 memcpy(to: &vht_cap, from: &sband->vht_cap, len: sizeof(vht_cap));
504 he_cap = ieee80211_get_he_iftype_cap_vif(sband, vif: &sdata->vif);
505 eht_cap = ieee80211_get_eht_iftype_cap_vif(sband, vif: &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: &vht_cap);
516
517 pos = skb_put(skb, len: sizeof(struct ieee80211_vht_cap) + 2);
518 ieee80211_ie_build_vht_cap(pos, vht_cap: &vht_cap, 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(to: &vht_cap, from: &sta->sta.deflink.vht_cap, len: sizeof(vht_cap));
523
524 pos = skb_put(skb, len: sizeof(struct ieee80211_vht_cap) + 2);
525 ieee80211_ie_build_vht_cap(pos, vht_cap: &vht_cap, 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, flag: 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(ies: extra_ies, ielen: extra_ies_len,
543 ids: before_he_cap,
544 ARRAY_SIZE(before_he_cap),
545 offset);
546 skb_put_data(skb, data: extra_ies + offset, len: 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, smps_mode: 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(ies: extra_ies, ielen: extra_ies_len,
570 ids: before_he_cap,
571 ARRAY_SIZE(before_he_cap),
572 offset);
573 skb_put_data(skb, data: extra_ies + offset, len: 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, data: extra_ies + offset, len: noffset - offset);
587 }
588
589}
590
591static void
592ieee80211_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, addr: peer);
609 ap_sta = sta_info_get(sdata, addr: 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(ies: extra_ies, ielen: extra_ies_len,
622 ids: before_qos,
623 ARRAY_SIZE(before_qos),
624 offset);
625 skb_put_data(skb, data: extra_ies + offset, len: 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(ies: extra_ies, ielen: extra_ies_len,
642 ids: before_ht_op,
643 ARRAY_SIZE(before_ht_op),
644 offset);
645 skb_put_data(skb, data: extra_ies + offset, len: 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, len: 2 + sizeof(struct ieee80211_ht_operation));
659 ieee80211_ie_build_ht_oper(pos, ht_cap: &sta->sta.deflink.ht_cap,
660 chandef: &link->conf->chanreq.oper, prot_mode: prot,
661 rifs_mode: 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, flag: WLAN_STA_TDLS_WIDER_BW))
674 ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
675
676 pos = skb_put(skb, len: 2 + sizeof(struct ieee80211_vht_operation));
677 ieee80211_ie_build_vht_oper(pos, vht_cap: &sta->sta.deflink.vht_cap,
678 chandef: &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, data: extra_ies + offset, len: noffset - offset);
685 }
686}
687
688static void
689ieee80211_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(freq: 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(ies: extra_ies, ielen: extra_ies_len,
711 ids: before_lnkie,
712 ARRAY_SIZE(before_lnkie),
713 offset);
714 skb_put_data(skb, data: extra_ies + offset, len: 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, data: extra_ies + offset, len: noffset - offset);
724 }
725}
726
727static void
728ieee80211_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, data: extra_ies, len: extra_ies_len);
739}
740
741static 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, data: extra_ies, len: 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
790static int
791ieee80211_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(to: tf->da, from: peer, ETH_ALEN);
802 memcpy(to: tf->sa, from: 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, len: 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, len: 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, len: 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, len: 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, len: 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, len: 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, len: 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
873static int
874ieee80211_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, len: 24);
883 memcpy(to: mgmt->da, from: peer, ETH_ALEN);
884 memcpy(to: mgmt->sa, from: sdata->vif.addr, ETH_ALEN);
885 memcpy(to: mgmt->bssid, from: 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, len: 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
908static struct sk_buff *
909ieee80211_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(dev: sdata->dev,
929 length: 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, len: 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(wiphy: local->hw.wiphy,
966 dev: 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(wiphy: local->hw.wiphy, dev: 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
990fail:
991 dev_kfree_skb(skb);
992unlock:
993 rcu_read_unlock();
994 return NULL;
995}
996
997static int
998ieee80211_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, addr: 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, flag: 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, flag: 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, flag: 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, tid: 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, addr: peer);
1100 try_resend = sta && test_sta_flag(sta, flag: WLAN_STA_TDLS_PEER_AUTH);
1101 rcu_read_unlock();
1102
1103 spin_lock_bh(lock: &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(lock: &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, info_flags: flags,
1125 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL);
1126 local_bh_enable();
1127
1128 return ret;
1129
1130fail:
1131 dev_kfree_skb(skb);
1132 return ret;
1133}
1134
1135static int
1136ieee80211_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(addr: sdata->u.mgd.tdls_peer) &&
1160 !ether_addr_equal(addr1: sdata->u.mgd.tdls_peer, addr2: 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, addr: 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, drop: false);
1183 memcpy(to: sdata->u.mgd.tdls_peer, from: 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, oper_class: 0,
1191 NULL);
1192 if (ret < 0) {
1193 eth_zero_addr(addr: sdata->u.mgd.tdls_peer);
1194 return ret;
1195 }
1196
1197 wiphy_delayed_work_queue(wiphy: sdata->local->hw.wiphy,
1198 dwork: &sdata->u.mgd.tdls_peer_del_work,
1199 TDLS_PEER_SETUP_TIMEOUT);
1200 return 0;
1201
1202out_unlock:
1203 return ret;
1204}
1205
1206static int
1207ieee80211_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 reason: IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1227 ieee80211_flush_queues(local, sdata, drop: 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, oper_class: 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, addr: peer);
1245 if (sta)
1246 clear_sta_flag(sta, flag: WLAN_STA_TDLS_PEER_AUTH);
1247 rcu_read_unlock();
1248
1249 ieee80211_wake_vif_queues(local, sdata,
1250 reason: IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1251
1252 return 0;
1253}
1254
1255int 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(local: 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, oper_class: 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
1317static 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, flag: WLAN_STA_TDLS_WIDER_BW)) {
1339 enum ieee80211_sta_rx_bandwidth bw;
1340
1341 bw = ieee80211_chan_width_to_rx_bw(width: 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,
1346 link_sta: &sta->deflink,
1347 changed: IEEE80211_RC_BW_CHANGED);
1348 /*
1349 * if a TDLS peer BW was updated, we need to
1350 * recalc the chandef width again, to get the
1351 * correct chanctx min_def
1352 */
1353 ieee80211_recalc_chanctx_chantype(local, ctx);
1354 }
1355 }
1356
1357 }
1358}
1359
1360static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1361{
1362 struct sta_info *sta;
1363 bool result = false;
1364
1365 rcu_read_lock();
1366 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1367 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1368 !test_sta_flag(sta, flag: WLAN_STA_AUTHORIZED) ||
1369 !test_sta_flag(sta, flag: WLAN_STA_TDLS_PEER_AUTH) ||
1370 !sta->sta.deflink.ht_cap.ht_supported)
1371 continue;
1372 result = true;
1373 break;
1374 }
1375 rcu_read_unlock();
1376
1377 return result;
1378}
1379
1380static void
1381iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1382 struct sta_info *sta)
1383{
1384 bool tdls_ht;
1385 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1386 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1387 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1388 u16 opmode;
1389
1390 /* Nothing to do if the BSS connection uses (at least) HT */
1391 if (sdata->deflink.u.mgd.conn.mode >= IEEE80211_CONN_MODE_HT)
1392 return;
1393
1394 tdls_ht = (sta && sta->sta.deflink.ht_cap.ht_supported) ||
1395 iee80211_tdls_have_ht_peers(sdata);
1396
1397 opmode = sdata->vif.bss_conf.ht_operation_mode;
1398
1399 if (tdls_ht)
1400 opmode |= protection;
1401 else
1402 opmode &= ~protection;
1403
1404 if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1405 return;
1406
1407 sdata->vif.bss_conf.ht_operation_mode = opmode;
1408 ieee80211_link_info_change_notify(sdata, link: &sdata->deflink,
1409 changed: BSS_CHANGED_HT);
1410}
1411
1412int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1413 const u8 *peer, enum nl80211_tdls_operation oper)
1414{
1415 struct sta_info *sta;
1416 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1417 struct ieee80211_local *local = sdata->local;
1418 int ret;
1419
1420 lockdep_assert_wiphy(local->hw.wiphy);
1421
1422 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1423 return -EOPNOTSUPP;
1424
1425 if (sdata->vif.type != NL80211_IFTYPE_STATION || !sdata->vif.cfg.assoc)
1426 return -EINVAL;
1427
1428 switch (oper) {
1429 case NL80211_TDLS_ENABLE_LINK:
1430 case NL80211_TDLS_DISABLE_LINK:
1431 break;
1432 case NL80211_TDLS_TEARDOWN:
1433 case NL80211_TDLS_SETUP:
1434 case NL80211_TDLS_DISCOVERY_REQ:
1435 /* We don't support in-driver setup/teardown/discovery */
1436 return -EOPNOTSUPP;
1437 }
1438
1439 /* protect possible bss_conf changes and avoid concurrency in
1440 * ieee80211_bss_info_change_notify()
1441 */
1442 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1443
1444 switch (oper) {
1445 case NL80211_TDLS_ENABLE_LINK:
1446 if (sdata->vif.bss_conf.csa_active) {
1447 tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1448 return -EBUSY;
1449 }
1450
1451 sta = sta_info_get(sdata, addr: peer);
1452 if (!sta)
1453 return -ENOLINK;
1454
1455 iee80211_tdls_recalc_chanctx(sdata, sta);
1456 iee80211_tdls_recalc_ht_protection(sdata, sta);
1457
1458 set_sta_flag(sta, flag: WLAN_STA_TDLS_PEER_AUTH);
1459
1460 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1461 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1462 break;
1463 case NL80211_TDLS_DISABLE_LINK:
1464 /*
1465 * The teardown message in ieee80211_tdls_mgmt_teardown() was
1466 * created while the queues were stopped, so it might still be
1467 * pending. Before flushing the queues we need to be sure the
1468 * message is handled by the tasklet handling pending messages,
1469 * otherwise we might start destroying the station before
1470 * sending the teardown packet.
1471 * Note that this only forces the tasklet to flush pendings -
1472 * not to stop the tasklet from rescheduling itself.
1473 */
1474 tasklet_kill(t: &local->tx_pending_tasklet);
1475 /* flush a potentially queued teardown packet */
1476 ieee80211_flush_queues(local, sdata, drop: false);
1477
1478 ret = sta_info_destroy_addr(sdata, addr: peer);
1479
1480 iee80211_tdls_recalc_ht_protection(sdata, NULL);
1481
1482 iee80211_tdls_recalc_chanctx(sdata, NULL);
1483 if (ret)
1484 return ret;
1485 break;
1486 default:
1487 return -EOPNOTSUPP;
1488 }
1489
1490 if (ether_addr_equal(addr1: sdata->u.mgd.tdls_peer, addr2: peer)) {
1491 wiphy_delayed_work_cancel(wiphy: sdata->local->hw.wiphy,
1492 dwork: &sdata->u.mgd.tdls_peer_del_work);
1493 eth_zero_addr(addr: sdata->u.mgd.tdls_peer);
1494 }
1495
1496 wiphy_work_queue(wiphy: sdata->local->hw.wiphy,
1497 work: &sdata->deflink.u.mgd.request_smps_work);
1498
1499 return 0;
1500}
1501
1502void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1503 enum nl80211_tdls_operation oper,
1504 u16 reason_code, gfp_t gfp)
1505{
1506 struct ieee80211_sub_if_data *sdata = vif_to_sdata(p: vif);
1507
1508 if (vif->type != NL80211_IFTYPE_STATION || !vif->cfg.assoc) {
1509 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1510 oper);
1511 return;
1512 }
1513
1514 cfg80211_tdls_oper_request(dev: sdata->dev, peer, oper, reason_code, gfp);
1515}
1516EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1517
1518static void
1519iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1520{
1521 struct ieee80211_ch_switch_timing *ch_sw;
1522
1523 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1524 *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1525
1526 ch_sw = (void *)buf;
1527 ch_sw->switch_time = cpu_to_le16(switch_time);
1528 ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1529}
1530
1531/* find switch timing IE in SKB ready for Tx */
1532static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1533{
1534 struct ieee80211_tdls_data *tf;
1535 const u8 *ie_start;
1536
1537 /*
1538 * Get the offset for the new location of the switch timing IE.
1539 * The SKB network header will now point to the "payload_type"
1540 * element of the TDLS data frame struct.
1541 */
1542 tf = container_of(skb->data + skb_network_offset(skb),
1543 struct ieee80211_tdls_data, payload_type);
1544 ie_start = tf->u.chan_switch_req.variable;
1545 return cfg80211_find_ie(eid: WLAN_EID_CHAN_SWITCH_TIMING, ies: ie_start,
1546 len: skb->len - (ie_start - skb->data));
1547}
1548
1549static struct sk_buff *
1550ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1551 struct cfg80211_chan_def *chandef,
1552 u32 *ch_sw_tm_ie_offset)
1553{
1554 struct ieee80211_sub_if_data *sdata = sta->sdata;
1555 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1556 2 + sizeof(struct ieee80211_ch_switch_timing)];
1557 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1558 u8 *pos = extra_ies;
1559 struct sk_buff *skb;
1560 int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0;
1561
1562 /*
1563 * if chandef points to a wide channel add a Secondary-Channel
1564 * Offset information element
1565 */
1566 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1567 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1568 bool ht40plus;
1569
1570 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1571 *pos++ = sizeof(*sec_chan_ie);
1572 sec_chan_ie = (void *)pos;
1573
1574 ht40plus = cfg80211_get_chandef_type(chandef) ==
1575 NL80211_CHAN_HT40PLUS;
1576 sec_chan_ie->sec_chan_offs = ht40plus ?
1577 IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1578 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1579 pos += sizeof(*sec_chan_ie);
1580
1581 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1582 }
1583
1584 /* just set the values to 0, this is a template */
1585 iee80211_tdls_add_ch_switch_timing(buf: pos, switch_time: 0, switch_timeout: 0);
1586
1587 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer: sta->sta.addr,
1588 link_id,
1589 action_code: WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1590 dialog_token: 0, status_code: 0, initiator: !sta->sta.tdls_initiator,
1591 extra_ies, extra_ies_len,
1592 oper_class, chandef);
1593 if (!skb)
1594 return NULL;
1595
1596 skb = ieee80211_build_data_template(sdata, skb, info_flags: 0);
1597 if (IS_ERR(ptr: skb)) {
1598 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1599 return NULL;
1600 }
1601
1602 if (ch_sw_tm_ie_offset) {
1603 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1604
1605 if (!tm_ie) {
1606 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1607 dev_kfree_skb_any(skb);
1608 return NULL;
1609 }
1610
1611 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1612 }
1613
1614 tdls_dbg(sdata,
1615 "TDLS channel switch request template for %pM ch %d width %d\n",
1616 sta->sta.addr, chandef->chan->center_freq, chandef->width);
1617 return skb;
1618}
1619
1620int
1621ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1622 const u8 *addr, u8 oper_class,
1623 struct cfg80211_chan_def *chandef)
1624{
1625 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1626 struct ieee80211_local *local = sdata->local;
1627 struct sta_info *sta;
1628 struct sk_buff *skb = NULL;
1629 u32 ch_sw_tm_ie;
1630 int ret;
1631
1632 lockdep_assert_wiphy(local->hw.wiphy);
1633
1634 if (chandef->chan->freq_offset)
1635 /* this may work, but is untested */
1636 return -EOPNOTSUPP;
1637
1638 sta = sta_info_get(sdata, addr);
1639 if (!sta) {
1640 tdls_dbg(sdata,
1641 "Invalid TDLS peer %pM for channel switch request\n",
1642 addr);
1643 ret = -ENOENT;
1644 goto out;
1645 }
1646
1647 if (!test_sta_flag(sta, flag: WLAN_STA_TDLS_CHAN_SWITCH)) {
1648 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1649 addr);
1650 ret = -EOPNOTSUPP;
1651 goto out;
1652 }
1653
1654 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1655 ch_sw_tm_ie_offset: &ch_sw_tm_ie);
1656 if (!skb) {
1657 ret = -ENOENT;
1658 goto out;
1659 }
1660
1661 ret = drv_tdls_channel_switch(local, sdata, sta: &sta->sta, oper_class,
1662 chandef, tmpl_skb: skb, ch_sw_tm_ie);
1663 if (!ret)
1664 set_sta_flag(sta, flag: WLAN_STA_TDLS_OFF_CHANNEL);
1665
1666out:
1667 dev_kfree_skb_any(skb);
1668 return ret;
1669}
1670
1671void
1672ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1673 struct net_device *dev,
1674 const u8 *addr)
1675{
1676 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1677 struct ieee80211_local *local = sdata->local;
1678 struct sta_info *sta;
1679
1680 lockdep_assert_wiphy(local->hw.wiphy);
1681
1682 sta = sta_info_get(sdata, addr);
1683 if (!sta) {
1684 tdls_dbg(sdata,
1685 "Invalid TDLS peer %pM for channel switch cancel\n",
1686 addr);
1687 return;
1688 }
1689
1690 if (!test_sta_flag(sta, flag: WLAN_STA_TDLS_OFF_CHANNEL)) {
1691 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1692 addr);
1693 return;
1694 }
1695
1696 drv_tdls_cancel_channel_switch(local, sdata, sta: &sta->sta);
1697 clear_sta_flag(sta, flag: WLAN_STA_TDLS_OFF_CHANNEL);
1698}
1699
1700static struct sk_buff *
1701ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1702 u32 *ch_sw_tm_ie_offset)
1703{
1704 struct ieee80211_sub_if_data *sdata = sta->sdata;
1705 struct sk_buff *skb;
1706 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1707 int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0;
1708
1709 /* initial timing are always zero in the template */
1710 iee80211_tdls_add_ch_switch_timing(buf: extra_ies, switch_time: 0, switch_timeout: 0);
1711
1712 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer: sta->sta.addr,
1713 link_id,
1714 action_code: WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1715 dialog_token: 0, status_code: 0, initiator: !sta->sta.tdls_initiator,
1716 extra_ies, extra_ies_len: sizeof(extra_ies), oper_class: 0, NULL);
1717 if (!skb)
1718 return NULL;
1719
1720 skb = ieee80211_build_data_template(sdata, skb, info_flags: 0);
1721 if (IS_ERR(ptr: skb)) {
1722 tdls_dbg(sdata,
1723 "Failed building TDLS channel switch resp frame\n");
1724 return NULL;
1725 }
1726
1727 if (ch_sw_tm_ie_offset) {
1728 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1729
1730 if (!tm_ie) {
1731 tdls_dbg(sdata,
1732 "No switch timing IE in TDLS switch resp\n");
1733 dev_kfree_skb_any(skb);
1734 return NULL;
1735 }
1736
1737 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1738 }
1739
1740 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1741 sta->sta.addr);
1742 return skb;
1743}
1744
1745static int
1746ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1747 struct sk_buff *skb)
1748{
1749 struct ieee80211_local *local = sdata->local;
1750 struct ieee802_11_elems *elems = NULL;
1751 struct sta_info *sta;
1752 struct ieee80211_tdls_data *tf = (void *)skb->data;
1753 bool local_initiator;
1754 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1755 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1756 struct ieee80211_tdls_ch_sw_params params = {};
1757 int ret;
1758
1759 lockdep_assert_wiphy(local->hw.wiphy);
1760
1761 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1762 params.timestamp = rx_status->device_timestamp;
1763
1764 if (skb->len < baselen) {
1765 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1766 skb->len);
1767 return -EINVAL;
1768 }
1769
1770 sta = sta_info_get(sdata, addr: tf->sa);
1771 if (!sta || !test_sta_flag(sta, flag: WLAN_STA_TDLS_PEER_AUTH)) {
1772 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1773 tf->sa);
1774 ret = -EINVAL;
1775 goto out;
1776 }
1777
1778 params.sta = &sta->sta;
1779 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1780 if (params.status != 0) {
1781 ret = 0;
1782 goto call_drv;
1783 }
1784
1785 elems = ieee802_11_parse_elems(start: tf->u.chan_switch_resp.variable,
1786 len: skb->len - baselen, action: false, NULL);
1787 if (!elems) {
1788 ret = -ENOMEM;
1789 goto out;
1790 }
1791
1792 if (elems->parse_error) {
1793 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1794 ret = -EINVAL;
1795 goto out;
1796 }
1797
1798 if (!elems->ch_sw_timing || !elems->lnk_id) {
1799 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1800 ret = -EINVAL;
1801 goto out;
1802 }
1803
1804 /* validate the initiator is set correctly */
1805 local_initiator =
1806 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1807 if (local_initiator == sta->sta.tdls_initiator) {
1808 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1809 ret = -EINVAL;
1810 goto out;
1811 }
1812
1813 params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time);
1814 params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout);
1815
1816 params.tmpl_skb =
1817 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ch_sw_tm_ie_offset: &params.ch_sw_tm_ie);
1818 if (!params.tmpl_skb) {
1819 ret = -ENOENT;
1820 goto out;
1821 }
1822
1823 ret = 0;
1824call_drv:
1825 drv_tdls_recv_channel_switch(local: sdata->local, sdata, params: &params);
1826
1827 tdls_dbg(sdata,
1828 "TDLS channel switch response received from %pM status %d\n",
1829 tf->sa, params.status);
1830
1831out:
1832 dev_kfree_skb_any(skb: params.tmpl_skb);
1833 kfree(objp: elems);
1834 return ret;
1835}
1836
1837static int
1838ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1839 struct sk_buff *skb)
1840{
1841 struct ieee80211_local *local = sdata->local;
1842 struct ieee802_11_elems *elems;
1843 struct cfg80211_chan_def chandef;
1844 struct ieee80211_channel *chan;
1845 enum nl80211_channel_type chan_type;
1846 int freq;
1847 u8 target_channel, oper_class;
1848 bool local_initiator;
1849 struct sta_info *sta;
1850 enum nl80211_band band;
1851 struct ieee80211_tdls_data *tf = (void *)skb->data;
1852 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1853 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1854 struct ieee80211_tdls_ch_sw_params params = {};
1855 int ret = 0;
1856
1857 lockdep_assert_wiphy(local->hw.wiphy);
1858
1859 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1860 params.timestamp = rx_status->device_timestamp;
1861
1862 if (skb->len < baselen) {
1863 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1864 skb->len);
1865 return -EINVAL;
1866 }
1867
1868 target_channel = tf->u.chan_switch_req.target_channel;
1869 oper_class = tf->u.chan_switch_req.oper_class;
1870
1871 /*
1872 * We can't easily infer the channel band. The operating class is
1873 * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1874 * solution here is to treat channels with number >14 as 5GHz ones,
1875 * and specifically check for the (oper_class, channel) combinations
1876 * where this doesn't hold. These are thankfully unique according to
1877 * IEEE802.11-2012.
1878 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1879 * valid here.
1880 */
1881 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1882 oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1883 target_channel < 14)
1884 band = NL80211_BAND_5GHZ;
1885 else
1886 band = target_channel < 14 ? NL80211_BAND_2GHZ :
1887 NL80211_BAND_5GHZ;
1888
1889 freq = ieee80211_channel_to_frequency(chan: target_channel, band);
1890 if (freq == 0) {
1891 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1892 target_channel);
1893 return -EINVAL;
1894 }
1895
1896 chan = ieee80211_get_channel(wiphy: sdata->local->hw.wiphy, freq);
1897 if (!chan) {
1898 tdls_dbg(sdata,
1899 "Unsupported channel for TDLS chan switch: %d\n",
1900 target_channel);
1901 return -EINVAL;
1902 }
1903
1904 elems = ieee802_11_parse_elems(start: tf->u.chan_switch_req.variable,
1905 len: skb->len - baselen, action: false, NULL);
1906 if (!elems)
1907 return -ENOMEM;
1908
1909 if (elems->parse_error) {
1910 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1911 ret = -EINVAL;
1912 goto free;
1913 }
1914
1915 if (!elems->ch_sw_timing || !elems->lnk_id) {
1916 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1917 ret = -EINVAL;
1918 goto free;
1919 }
1920
1921 if (!elems->sec_chan_offs) {
1922 chan_type = NL80211_CHAN_HT20;
1923 } else {
1924 switch (elems->sec_chan_offs->sec_chan_offs) {
1925 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1926 chan_type = NL80211_CHAN_HT40PLUS;
1927 break;
1928 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1929 chan_type = NL80211_CHAN_HT40MINUS;
1930 break;
1931 default:
1932 chan_type = NL80211_CHAN_HT20;
1933 break;
1934 }
1935 }
1936
1937 cfg80211_chandef_create(chandef: &chandef, channel: chan, chantype: chan_type);
1938
1939 /* we will be active on the TDLS link */
1940 if (!cfg80211_reg_can_beacon_relax(wiphy: sdata->local->hw.wiphy, chandef: &chandef,
1941 iftype: sdata->wdev.iftype)) {
1942 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1943 ret = -EINVAL;
1944 goto free;
1945 }
1946
1947 sta = sta_info_get(sdata, addr: tf->sa);
1948 if (!sta || !test_sta_flag(sta, flag: WLAN_STA_TDLS_PEER_AUTH)) {
1949 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1950 tf->sa);
1951 ret = -EINVAL;
1952 goto out;
1953 }
1954
1955 params.sta = &sta->sta;
1956
1957 /* validate the initiator is set correctly */
1958 local_initiator =
1959 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1960 if (local_initiator == sta->sta.tdls_initiator) {
1961 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1962 ret = -EINVAL;
1963 goto out;
1964 }
1965
1966 /* peer should have known better */
1967 if (!sta->sta.deflink.ht_cap.ht_supported && elems->sec_chan_offs &&
1968 elems->sec_chan_offs->sec_chan_offs) {
1969 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1970 ret = -EOPNOTSUPP;
1971 goto out;
1972 }
1973
1974 params.chandef = &chandef;
1975 params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time);
1976 params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout);
1977
1978 params.tmpl_skb =
1979 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1980 ch_sw_tm_ie_offset: &params.ch_sw_tm_ie);
1981 if (!params.tmpl_skb) {
1982 ret = -ENOENT;
1983 goto out;
1984 }
1985
1986 drv_tdls_recv_channel_switch(local: sdata->local, sdata, params: &params);
1987
1988 tdls_dbg(sdata,
1989 "TDLS ch switch request received from %pM ch %d width %d\n",
1990 tf->sa, params.chandef->chan->center_freq,
1991 params.chandef->width);
1992out:
1993 dev_kfree_skb_any(skb: params.tmpl_skb);
1994free:
1995 kfree(objp: elems);
1996 return ret;
1997}
1998
1999void
2000ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
2001 struct sk_buff *skb)
2002{
2003 struct ieee80211_tdls_data *tf = (void *)skb->data;
2004 struct wiphy *wiphy = sdata->local->hw.wiphy;
2005
2006 lockdep_assert_wiphy(wiphy);
2007
2008 /* make sure the driver supports it */
2009 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
2010 return;
2011
2012 /* we want to access the entire packet */
2013 if (skb_linearize(skb))
2014 return;
2015 /*
2016 * The packet/size was already validated by mac80211 Rx path, only look
2017 * at the action type.
2018 */
2019 switch (tf->action_code) {
2020 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
2021 ieee80211_process_tdls_channel_switch_req(sdata, skb);
2022 break;
2023 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
2024 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
2025 break;
2026 default:
2027 WARN_ON_ONCE(1);
2028 return;
2029 }
2030}
2031
2032void ieee80211_teardown_tdls_peers(struct ieee80211_link_data *link)
2033{
2034 struct ieee80211_sub_if_data *sdata = link->sdata;
2035 struct sta_info *sta;
2036 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
2037
2038 rcu_read_lock();
2039 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
2040 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
2041 !test_sta_flag(sta, flag: WLAN_STA_AUTHORIZED))
2042 continue;
2043
2044 if (sta->deflink.link_id != link->link_id)
2045 continue;
2046
2047 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
2048 NL80211_TDLS_TEARDOWN, reason,
2049 GFP_ATOMIC);
2050 }
2051 rcu_read_unlock();
2052}
2053
2054void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata,
2055 const u8 *peer, u16 reason)
2056{
2057 struct ieee80211_sta *sta;
2058
2059 rcu_read_lock();
2060 sta = ieee80211_find_sta(vif: &sdata->vif, addr: peer);
2061 if (!sta || !sta->tdls) {
2062 rcu_read_unlock();
2063 return;
2064 }
2065 rcu_read_unlock();
2066
2067 tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n",
2068 peer, reason,
2069 ieee80211_get_reason_code_string(reason));
2070
2071 ieee80211_tdls_oper_request(&sdata->vif, peer,
2072 NL80211_TDLS_TEARDOWN,
2073 WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE,
2074 GFP_ATOMIC);
2075}
2076