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, ¶ms.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, ¶ms);
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 ¶ms.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, ¶ms);
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