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, 2021-2026 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, WLAN_EID_SUPP_RATES);
386 ieee80211_put_srates_elem(skb, sband, 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 if (action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
883 return -EINVAL;
884
885 mgmt = skb_put_zero(skb, IEEE80211_MIN_ACTION_SIZE(tdls_discover_resp));
886 memcpy(mgmt->da, peer, ETH_ALEN);
887 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
888 memcpy(mgmt->bssid, link->u.mgd.bssid, ETH_ALEN);
889 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
890 IEEE80211_STYPE_ACTION);
891
892 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
893 mgmt->u.action.action_code = WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
894
895 mgmt->u.action.tdls_discover_resp.dialog_token = dialog_token;
896 mgmt->u.action.tdls_discover_resp.capability =
897 cpu_to_le16(ieee80211_get_tdls_sta_capab(link,
898 status_code));
899
900 return 0;
901 }
902
903 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)904 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
905 const u8 *peer, int link_id,
906 u8 action_code, u8 dialog_token,
907 u16 status_code, bool initiator,
908 const u8 *extra_ies, size_t extra_ies_len,
909 u8 oper_class,
910 struct cfg80211_chan_def *chandef)
911 {
912 struct ieee80211_local *local = sdata->local;
913 struct sk_buff *skb;
914 int ret;
915 struct ieee80211_link_data *link;
916
917 link_id = link_id >= 0 ? link_id : 0;
918 rcu_read_lock();
919 link = rcu_dereference(sdata->link[link_id]);
920 if (WARN_ON(!link))
921 goto unlock;
922
923 skb = netdev_alloc_skb(sdata->dev,
924 local->hw.extra_tx_headroom +
925 max(sizeof(struct ieee80211_mgmt),
926 sizeof(struct ieee80211_tdls_data)) +
927 50 + /* supported rates */
928 10 + /* ext capab */
929 26 + /* max(WMM-info, WMM-param) */
930 2 + max(sizeof(struct ieee80211_ht_cap),
931 sizeof(struct ieee80211_ht_operation)) +
932 2 + max(sizeof(struct ieee80211_vht_cap),
933 sizeof(struct ieee80211_vht_operation)) +
934 2 + 1 + sizeof(struct ieee80211_he_cap_elem) +
935 sizeof(struct ieee80211_he_mcs_nss_supp) +
936 IEEE80211_HE_PPE_THRES_MAX_LEN +
937 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
938 2 + 1 + sizeof(struct ieee80211_eht_cap_elem) +
939 sizeof(struct ieee80211_eht_mcs_nss_supp) +
940 IEEE80211_EHT_PPE_THRES_MAX_LEN +
941 50 + /* supported channels */
942 3 + /* 40/20 BSS coex */
943 4 + /* AID */
944 4 + /* oper classes */
945 extra_ies_len +
946 sizeof(struct ieee80211_tdls_lnkie));
947 if (!skb)
948 goto unlock;
949
950 skb_reserve(skb, local->hw.extra_tx_headroom);
951
952 switch (action_code) {
953 case WLAN_TDLS_SETUP_REQUEST:
954 case WLAN_TDLS_SETUP_RESPONSE:
955 case WLAN_TDLS_SETUP_CONFIRM:
956 case WLAN_TDLS_TEARDOWN:
957 case WLAN_TDLS_DISCOVERY_REQUEST:
958 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
959 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
960 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
961 sdata->dev, link, peer,
962 action_code, dialog_token,
963 status_code, skb);
964 break;
965 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
966 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
967 peer, link, action_code,
968 dialog_token, status_code,
969 skb);
970 break;
971 default:
972 ret = -EOPNOTSUPP;
973 break;
974 }
975
976 if (ret < 0)
977 goto fail;
978
979 ieee80211_tdls_add_ies(link, skb, peer, action_code, status_code,
980 initiator, extra_ies, extra_ies_len, oper_class,
981 chandef);
982 rcu_read_unlock();
983 return skb;
984
985 fail:
986 dev_kfree_skb(skb);
987 unlock:
988 rcu_read_unlock();
989 return NULL;
990 }
991
992 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)993 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
994 const u8 *peer, int link_id,
995 u8 action_code, u8 dialog_token,
996 u16 status_code, u32 peer_capability,
997 bool initiator, const u8 *extra_ies,
998 size_t extra_ies_len, u8 oper_class,
999 struct cfg80211_chan_def *chandef)
1000 {
1001 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1002 struct sk_buff *skb = NULL;
1003 struct sta_info *sta;
1004 u32 flags = 0;
1005 int ret = 0;
1006
1007 rcu_read_lock();
1008 sta = sta_info_get(sdata, peer);
1009
1010 /* infer the initiator if we can, to support old userspace */
1011 switch (action_code) {
1012 case WLAN_TDLS_SETUP_REQUEST:
1013 if (sta) {
1014 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
1015 sta->sta.tdls_initiator = false;
1016 }
1017 fallthrough;
1018 case WLAN_TDLS_SETUP_CONFIRM:
1019 case WLAN_TDLS_DISCOVERY_REQUEST:
1020 initiator = true;
1021 break;
1022 case WLAN_TDLS_SETUP_RESPONSE:
1023 /*
1024 * In some testing scenarios, we send a request and response.
1025 * Make the last packet sent take effect for the initiator
1026 * value.
1027 */
1028 if (sta) {
1029 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
1030 sta->sta.tdls_initiator = true;
1031 }
1032 fallthrough;
1033 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1034 initiator = false;
1035 break;
1036 case WLAN_TDLS_TEARDOWN:
1037 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1038 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1039 /* any value is ok */
1040 break;
1041 default:
1042 ret = -EOPNOTSUPP;
1043 break;
1044 }
1045
1046 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
1047 initiator = true;
1048
1049 rcu_read_unlock();
1050 if (ret < 0)
1051 goto fail;
1052
1053 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer,
1054 link_id, action_code,
1055 dialog_token, status_code,
1056 initiator, extra_ies,
1057 extra_ies_len, oper_class,
1058 chandef);
1059 if (!skb) {
1060 ret = -EINVAL;
1061 goto fail;
1062 }
1063
1064 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
1065 ieee80211_tx_skb_tid(sdata, skb, 7, link_id);
1066 return 0;
1067 }
1068
1069 /*
1070 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1071 * we should default to AC_VI.
1072 */
1073 switch (action_code) {
1074 case WLAN_TDLS_SETUP_REQUEST:
1075 case WLAN_TDLS_SETUP_RESPONSE:
1076 skb->priority = 256 + 2;
1077 break;
1078 default:
1079 skb->priority = 256 + 5;
1080 break;
1081 }
1082
1083 /*
1084 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1085 * Later, if no ACK is returned from peer, we will re-send the teardown
1086 * packet through the AP.
1087 */
1088 if ((action_code == WLAN_TDLS_TEARDOWN) &&
1089 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1090 bool try_resend; /* Should we keep skb for possible resend */
1091
1092 /* If not sending directly to peer - no point in keeping skb */
1093 rcu_read_lock();
1094 sta = sta_info_get(sdata, peer);
1095 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1096 rcu_read_unlock();
1097
1098 spin_lock_bh(&sdata->u.mgd.teardown_lock);
1099 if (try_resend && !sdata->u.mgd.teardown_skb) {
1100 /* Mark it as requiring TX status callback */
1101 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1102 IEEE80211_TX_INTFL_MLME_CONN_TX;
1103
1104 /*
1105 * skb is copied since mac80211 will later set
1106 * properties that might not be the same as the AP,
1107 * such as encryption, QoS, addresses, etc.
1108 *
1109 * No problem if skb_copy() fails, so no need to check.
1110 */
1111 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1112 sdata->u.mgd.orig_teardown_skb = skb;
1113 }
1114 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1115 }
1116
1117 /* disable bottom halves when entering the Tx path */
1118 local_bh_disable();
1119 __ieee80211_subif_start_xmit(skb, dev, flags,
1120 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL);
1121 local_bh_enable();
1122
1123 return ret;
1124
1125 fail:
1126 dev_kfree_skb(skb);
1127 return ret;
1128 }
1129
1130 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)1131 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1132 const u8 *peer, int link_id,
1133 u8 action_code, u8 dialog_token,
1134 u16 status_code, u32 peer_capability, bool initiator,
1135 const u8 *extra_ies, size_t extra_ies_len)
1136 {
1137 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1138 struct ieee80211_local *local = sdata->local;
1139 enum ieee80211_smps_mode smps_mode =
1140 sdata->deflink.u.mgd.driver_smps_mode;
1141 int ret;
1142
1143 /* don't support setup with forced SMPS mode that's not off */
1144 if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1145 smps_mode != IEEE80211_SMPS_OFF) {
1146 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1147 smps_mode);
1148 return -EOPNOTSUPP;
1149 }
1150
1151 lockdep_assert_wiphy(local->hw.wiphy);
1152
1153 /* we don't support concurrent TDLS peer setups */
1154 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1155 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1156 ret = -EBUSY;
1157 goto out_unlock;
1158 }
1159
1160 /*
1161 * make sure we have a STA representing the peer so we drop or buffer
1162 * non-TDLS-setup frames to the peer. We can't send other packets
1163 * during setup through the AP path.
1164 * Allow error packets to be sent - sometimes we don't even add a STA
1165 * before failing the setup.
1166 */
1167 if (status_code == 0) {
1168 rcu_read_lock();
1169 if (!sta_info_get(sdata, peer)) {
1170 rcu_read_unlock();
1171 ret = -ENOLINK;
1172 goto out_unlock;
1173 }
1174 rcu_read_unlock();
1175 }
1176
1177 ieee80211_flush_queues(local, sdata, false);
1178 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1179
1180 /* we cannot take the mutex while preparing the setup packet */
1181 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1182 link_id, action_code,
1183 dialog_token, status_code,
1184 peer_capability, initiator,
1185 extra_ies, extra_ies_len, 0,
1186 NULL);
1187 if (ret < 0) {
1188 eth_zero_addr(sdata->u.mgd.tdls_peer);
1189 return ret;
1190 }
1191
1192 wiphy_delayed_work_queue(sdata->local->hw.wiphy,
1193 &sdata->u.mgd.tdls_peer_del_work,
1194 TDLS_PEER_SETUP_TIMEOUT);
1195 return 0;
1196
1197 out_unlock:
1198 return ret;
1199 }
1200
1201 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)1202 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1203 const u8 *peer, int link_id,
1204 u8 action_code, u8 dialog_token,
1205 u16 status_code, u32 peer_capability,
1206 bool initiator, const u8 *extra_ies,
1207 size_t extra_ies_len)
1208 {
1209 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1210 struct ieee80211_local *local = sdata->local;
1211 struct sta_info *sta;
1212 int ret;
1213
1214 /*
1215 * No packets can be transmitted to the peer via the AP during setup -
1216 * the STA is set as a TDLS peer, but is not authorized.
1217 * During teardown, we prevent direct transmissions by stopping the
1218 * queues and flushing all direct packets.
1219 */
1220 ieee80211_stop_vif_queues(local, sdata,
1221 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1222 ieee80211_flush_queues(local, sdata, false);
1223
1224 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1225 link_id, action_code,
1226 dialog_token, status_code,
1227 peer_capability, initiator,
1228 extra_ies, extra_ies_len, 0,
1229 NULL);
1230 if (ret < 0)
1231 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1232 ret);
1233
1234 /*
1235 * Remove the STA AUTH flag to force further traffic through the AP. If
1236 * the STA was unreachable, it was already removed.
1237 */
1238 rcu_read_lock();
1239 sta = sta_info_get(sdata, peer);
1240 if (sta)
1241 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1242 rcu_read_unlock();
1243
1244 ieee80211_wake_vif_queues(local, sdata,
1245 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1246
1247 return 0;
1248 }
1249
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)1250 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1251 const u8 *peer, int link_id,
1252 u8 action_code, u8 dialog_token, u16 status_code,
1253 u32 peer_capability, bool initiator,
1254 const u8 *extra_ies, size_t extra_ies_len)
1255 {
1256 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1257 int ret;
1258
1259 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1260 return -EOPNOTSUPP;
1261
1262 /* make sure we are in managed mode, and associated */
1263 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1264 !sdata->u.mgd.associated)
1265 return -EINVAL;
1266
1267 switch (action_code) {
1268 case WLAN_TDLS_SETUP_REQUEST:
1269 case WLAN_TDLS_SETUP_RESPONSE:
1270 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer,
1271 link_id, action_code,
1272 dialog_token, status_code,
1273 peer_capability, initiator,
1274 extra_ies, extra_ies_len);
1275 break;
1276 case WLAN_TDLS_TEARDOWN:
1277 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, link_id,
1278 action_code, dialog_token,
1279 status_code,
1280 peer_capability, initiator,
1281 extra_ies, extra_ies_len);
1282 break;
1283 case WLAN_TDLS_DISCOVERY_REQUEST:
1284 /*
1285 * Protect the discovery so we can hear the TDLS discovery
1286 * response frame. It is transmitted directly and not buffered
1287 * by the AP.
1288 */
1289 drv_mgd_protect_tdls_discover(sdata->local, sdata, link_id);
1290 fallthrough;
1291 case WLAN_TDLS_SETUP_CONFIRM:
1292 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1293 /* no special handling */
1294 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1295 link_id, action_code,
1296 dialog_token,
1297 status_code,
1298 peer_capability,
1299 initiator, extra_ies,
1300 extra_ies_len, 0, NULL);
1301 break;
1302 default:
1303 ret = -EOPNOTSUPP;
1304 break;
1305 }
1306
1307 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM link_id %d status %d\n",
1308 action_code, peer, link_id, ret);
1309 return ret;
1310 }
1311
iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data * sdata,struct sta_info * sta)1312 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1313 struct sta_info *sta)
1314 {
1315 struct ieee80211_local *local = sdata->local;
1316 struct ieee80211_chanctx_conf *conf;
1317 struct ieee80211_chanctx *ctx;
1318 enum nl80211_chan_width width;
1319 struct ieee80211_supported_band *sband;
1320
1321 lockdep_assert_wiphy(local->hw.wiphy);
1322
1323 conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf,
1324 lockdep_is_held(&local->hw.wiphy->mtx));
1325 if (conf) {
1326 width = conf->def.width;
1327 sband = local->hw.wiphy->bands[conf->def.chan->band];
1328 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1329 ieee80211_recalc_chanctx_chantype(local, ctx);
1330
1331 /* if width changed and a peer is given, update its BW */
1332 if (width != conf->def.width && sta &&
1333 test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1334 enum ieee80211_sta_rx_bandwidth bw;
1335
1336 bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1337 bw = min(bw, ieee80211_sta_cap_rx_bw(&sta->deflink));
1338 if (bw != sta->sta.deflink.bandwidth) {
1339 sta->sta.deflink.bandwidth = bw;
1340 rate_control_rate_update(local, sband,
1341 &sta->deflink,
1342 IEEE80211_RC_BW_CHANGED);
1343 /*
1344 * if a TDLS peer BW was updated, we need to
1345 * recalc the chandef width again, to get the
1346 * correct chanctx min_def
1347 */
1348 ieee80211_recalc_chanctx_chantype(local, ctx);
1349 }
1350 }
1351
1352 }
1353 }
1354
iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data * sdata)1355 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1356 {
1357 struct sta_info *sta;
1358 bool result = false;
1359
1360 rcu_read_lock();
1361 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1362 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1363 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1364 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1365 !sta->sta.deflink.ht_cap.ht_supported)
1366 continue;
1367 result = true;
1368 break;
1369 }
1370 rcu_read_unlock();
1371
1372 return result;
1373 }
1374
1375 static void
iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data * sdata,struct sta_info * sta)1376 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1377 struct sta_info *sta)
1378 {
1379 bool tdls_ht;
1380 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1381 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1382 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1383 u16 opmode;
1384
1385 /* Nothing to do if the BSS connection uses (at least) HT */
1386 if (sdata->deflink.u.mgd.conn.mode >= IEEE80211_CONN_MODE_HT)
1387 return;
1388
1389 tdls_ht = (sta && sta->sta.deflink.ht_cap.ht_supported) ||
1390 iee80211_tdls_have_ht_peers(sdata);
1391
1392 opmode = sdata->vif.bss_conf.ht_operation_mode;
1393
1394 if (tdls_ht)
1395 opmode |= protection;
1396 else
1397 opmode &= ~protection;
1398
1399 if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1400 return;
1401
1402 sdata->vif.bss_conf.ht_operation_mode = opmode;
1403 ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1404 BSS_CHANGED_HT);
1405 }
1406
ieee80211_tdls_oper(struct wiphy * wiphy,struct net_device * dev,const u8 * peer,enum nl80211_tdls_operation oper)1407 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1408 const u8 *peer, enum nl80211_tdls_operation oper)
1409 {
1410 struct sta_info *sta;
1411 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1412 struct ieee80211_local *local = sdata->local;
1413 int ret;
1414
1415 lockdep_assert_wiphy(local->hw.wiphy);
1416
1417 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1418 return -EOPNOTSUPP;
1419
1420 if (sdata->vif.type != NL80211_IFTYPE_STATION || !sdata->vif.cfg.assoc)
1421 return -EINVAL;
1422
1423 switch (oper) {
1424 case NL80211_TDLS_ENABLE_LINK:
1425 case NL80211_TDLS_DISABLE_LINK:
1426 break;
1427 case NL80211_TDLS_TEARDOWN:
1428 case NL80211_TDLS_SETUP:
1429 case NL80211_TDLS_DISCOVERY_REQ:
1430 /* We don't support in-driver setup/teardown/discovery */
1431 return -EOPNOTSUPP;
1432 }
1433
1434 /* protect possible bss_conf changes and avoid concurrency in
1435 * ieee80211_bss_info_change_notify()
1436 */
1437 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1438
1439 switch (oper) {
1440 case NL80211_TDLS_ENABLE_LINK:
1441 if (sdata->vif.bss_conf.csa_active) {
1442 tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1443 return -EBUSY;
1444 }
1445
1446 sta = sta_info_get(sdata, peer);
1447 if (!sta || !sta->sta.tdls)
1448 return -ENOLINK;
1449
1450 iee80211_tdls_recalc_chanctx(sdata, sta);
1451 iee80211_tdls_recalc_ht_protection(sdata, sta);
1452
1453 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1454
1455 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1456 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1457 break;
1458 case NL80211_TDLS_DISABLE_LINK:
1459 /*
1460 * The teardown message in ieee80211_tdls_mgmt_teardown() was
1461 * created while the queues were stopped, so it might still be
1462 * pending. Before flushing the queues we need to be sure the
1463 * message is handled by the tasklet handling pending messages,
1464 * otherwise we might start destroying the station before
1465 * sending the teardown packet.
1466 * Note that this only forces the tasklet to flush pendings -
1467 * not to stop the tasklet from rescheduling itself.
1468 */
1469 tasklet_kill(&local->tx_pending_tasklet);
1470 /* flush a potentially queued teardown packet */
1471 ieee80211_flush_queues(local, sdata, false);
1472
1473 ret = sta_info_destroy_addr(sdata, peer);
1474
1475 iee80211_tdls_recalc_ht_protection(sdata, NULL);
1476
1477 iee80211_tdls_recalc_chanctx(sdata, NULL);
1478 if (ret)
1479 return ret;
1480 break;
1481 default:
1482 return -EOPNOTSUPP;
1483 }
1484
1485 if (ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1486 wiphy_delayed_work_cancel(sdata->local->hw.wiphy,
1487 &sdata->u.mgd.tdls_peer_del_work);
1488 eth_zero_addr(sdata->u.mgd.tdls_peer);
1489 }
1490
1491 wiphy_work_queue(sdata->local->hw.wiphy,
1492 &sdata->deflink.u.mgd.request_smps_work);
1493
1494 return 0;
1495 }
1496
ieee80211_tdls_oper_request(struct ieee80211_vif * vif,const u8 * peer,enum nl80211_tdls_operation oper,u16 reason_code,gfp_t gfp)1497 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1498 enum nl80211_tdls_operation oper,
1499 u16 reason_code, gfp_t gfp)
1500 {
1501 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1502
1503 if (vif->type != NL80211_IFTYPE_STATION || !vif->cfg.assoc) {
1504 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1505 oper);
1506 return;
1507 }
1508
1509 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1510 }
1511 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1512
1513 static void
iee80211_tdls_add_ch_switch_timing(u8 * buf,u16 switch_time,u16 switch_timeout)1514 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1515 {
1516 struct ieee80211_ch_switch_timing *ch_sw;
1517
1518 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1519 *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1520
1521 ch_sw = (void *)buf;
1522 ch_sw->switch_time = cpu_to_le16(switch_time);
1523 ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1524 }
1525
1526 /* find switch timing IE in SKB ready for Tx */
ieee80211_tdls_find_sw_timing_ie(struct sk_buff * skb)1527 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1528 {
1529 struct ieee80211_tdls_data *tf;
1530 const u8 *ie_start;
1531
1532 /*
1533 * Get the offset for the new location of the switch timing IE.
1534 * The SKB network header will now point to the "payload_type"
1535 * element of the TDLS data frame struct.
1536 */
1537 tf = container_of(skb->data + skb_network_offset(skb),
1538 struct ieee80211_tdls_data, payload_type);
1539 ie_start = tf->u.chan_switch_req.variable;
1540 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1541 skb->len - (ie_start - skb->data));
1542 }
1543
1544 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)1545 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1546 struct cfg80211_chan_def *chandef,
1547 u32 *ch_sw_tm_ie_offset)
1548 {
1549 struct ieee80211_sub_if_data *sdata = sta->sdata;
1550 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1551 2 + sizeof(struct ieee80211_ch_switch_timing)];
1552 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1553 u8 *pos = extra_ies;
1554 struct sk_buff *skb;
1555 int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0;
1556
1557 /*
1558 * if chandef points to a wide channel add a Secondary-Channel
1559 * Offset information element
1560 */
1561 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1562 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1563 bool ht40plus;
1564
1565 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1566 *pos++ = sizeof(*sec_chan_ie);
1567 sec_chan_ie = (void *)pos;
1568
1569 ht40plus = cfg80211_get_chandef_type(chandef) ==
1570 NL80211_CHAN_HT40PLUS;
1571 sec_chan_ie->sec_chan_offs = ht40plus ?
1572 IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1573 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1574 pos += sizeof(*sec_chan_ie);
1575
1576 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1577 }
1578
1579 /* just set the values to 0, this is a template */
1580 iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1581
1582 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1583 link_id,
1584 WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1585 0, 0, !sta->sta.tdls_initiator,
1586 extra_ies, extra_ies_len,
1587 oper_class, chandef);
1588 if (!skb)
1589 return NULL;
1590
1591 skb = ieee80211_build_data_template(sdata, skb, 0);
1592 if (IS_ERR(skb)) {
1593 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1594 return NULL;
1595 }
1596
1597 if (ch_sw_tm_ie_offset) {
1598 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1599
1600 if (!tm_ie) {
1601 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1602 dev_kfree_skb_any(skb);
1603 return NULL;
1604 }
1605
1606 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1607 }
1608
1609 tdls_dbg(sdata,
1610 "TDLS channel switch request template for %pM ch %d width %d\n",
1611 sta->sta.addr, chandef->chan->center_freq, chandef->width);
1612 return skb;
1613 }
1614
1615 int
ieee80211_tdls_channel_switch(struct wiphy * wiphy,struct net_device * dev,const u8 * addr,u8 oper_class,struct cfg80211_chan_def * chandef)1616 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1617 const u8 *addr, u8 oper_class,
1618 struct cfg80211_chan_def *chandef)
1619 {
1620 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1621 struct ieee80211_local *local = sdata->local;
1622 struct sta_info *sta;
1623 struct sk_buff *skb = NULL;
1624 u32 ch_sw_tm_ie;
1625 int ret;
1626
1627 lockdep_assert_wiphy(local->hw.wiphy);
1628
1629 if (chandef->chan->freq_offset)
1630 /* this may work, but is untested */
1631 return -EOPNOTSUPP;
1632
1633 sta = sta_info_get(sdata, addr);
1634 if (!sta) {
1635 tdls_dbg(sdata,
1636 "Invalid TDLS peer %pM for channel switch request\n",
1637 addr);
1638 ret = -ENOENT;
1639 goto out;
1640 }
1641
1642 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1643 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1644 addr);
1645 ret = -EOPNOTSUPP;
1646 goto out;
1647 }
1648
1649 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1650 &ch_sw_tm_ie);
1651 if (!skb) {
1652 ret = -ENOENT;
1653 goto out;
1654 }
1655
1656 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1657 chandef, skb, ch_sw_tm_ie);
1658 if (!ret)
1659 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1660
1661 out:
1662 dev_kfree_skb_any(skb);
1663 return ret;
1664 }
1665
1666 void
ieee80211_tdls_cancel_channel_switch(struct wiphy * wiphy,struct net_device * dev,const u8 * addr)1667 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1668 struct net_device *dev,
1669 const u8 *addr)
1670 {
1671 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1672 struct ieee80211_local *local = sdata->local;
1673 struct sta_info *sta;
1674
1675 lockdep_assert_wiphy(local->hw.wiphy);
1676
1677 sta = sta_info_get(sdata, addr);
1678 if (!sta) {
1679 tdls_dbg(sdata,
1680 "Invalid TDLS peer %pM for channel switch cancel\n",
1681 addr);
1682 return;
1683 }
1684
1685 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1686 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1687 addr);
1688 return;
1689 }
1690
1691 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1692 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1693 }
1694
1695 static struct sk_buff *
ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info * sta,u32 * ch_sw_tm_ie_offset)1696 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1697 u32 *ch_sw_tm_ie_offset)
1698 {
1699 struct ieee80211_sub_if_data *sdata = sta->sdata;
1700 struct sk_buff *skb;
1701 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1702 int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0;
1703
1704 /* initial timing are always zero in the template */
1705 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1706
1707 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1708 link_id,
1709 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1710 0, 0, !sta->sta.tdls_initiator,
1711 extra_ies, sizeof(extra_ies), 0, NULL);
1712 if (!skb)
1713 return NULL;
1714
1715 skb = ieee80211_build_data_template(sdata, skb, 0);
1716 if (IS_ERR(skb)) {
1717 tdls_dbg(sdata,
1718 "Failed building TDLS channel switch resp frame\n");
1719 return NULL;
1720 }
1721
1722 if (ch_sw_tm_ie_offset) {
1723 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1724
1725 if (!tm_ie) {
1726 tdls_dbg(sdata,
1727 "No switch timing IE in TDLS switch resp\n");
1728 dev_kfree_skb_any(skb);
1729 return NULL;
1730 }
1731
1732 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1733 }
1734
1735 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1736 sta->sta.addr);
1737 return skb;
1738 }
1739
1740 static int
ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1741 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1742 struct sk_buff *skb)
1743 {
1744 struct ieee80211_local *local = sdata->local;
1745 struct ieee802_11_elems *elems = NULL;
1746 struct sta_info *sta;
1747 struct ieee80211_tdls_data *tf = (void *)skb->data;
1748 bool local_initiator;
1749 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1750 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1751 struct ieee80211_tdls_ch_sw_params params = {};
1752 int ret;
1753
1754 lockdep_assert_wiphy(local->hw.wiphy);
1755
1756 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1757 params.timestamp = rx_status->device_timestamp;
1758
1759 if (skb->len < baselen) {
1760 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1761 skb->len);
1762 return -EINVAL;
1763 }
1764
1765 sta = sta_info_get(sdata, tf->sa);
1766 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1767 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1768 tf->sa);
1769 ret = -EINVAL;
1770 goto out;
1771 }
1772
1773 params.sta = &sta->sta;
1774 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1775 if (params.status != 0) {
1776 ret = 0;
1777 goto call_drv;
1778 }
1779
1780 elems = ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1781 skb->len - baselen,
1782 IEEE80211_FTYPE_MGMT |
1783 IEEE80211_STYPE_ACTION,
1784 NULL);
1785 if (!elems) {
1786 ret = -ENOMEM;
1787 goto out;
1788 }
1789
1790 if (elems->parse_error) {
1791 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1792 ret = -EINVAL;
1793 goto out;
1794 }
1795
1796 if (!elems->ch_sw_timing || !elems->lnk_id) {
1797 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1798 ret = -EINVAL;
1799 goto out;
1800 }
1801
1802 /* validate the initiator is set correctly */
1803 local_initiator =
1804 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1805 if (local_initiator == sta->sta.tdls_initiator) {
1806 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1807 ret = -EINVAL;
1808 goto out;
1809 }
1810
1811 params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time);
1812 params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout);
1813
1814 params.tmpl_skb =
1815 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie);
1816 if (!params.tmpl_skb) {
1817 ret = -ENOENT;
1818 goto out;
1819 }
1820
1821 ret = 0;
1822 call_drv:
1823 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms);
1824
1825 tdls_dbg(sdata,
1826 "TDLS channel switch response received from %pM status %d\n",
1827 tf->sa, params.status);
1828
1829 out:
1830 dev_kfree_skb_any(params.tmpl_skb);
1831 kfree(elems);
1832 return ret;
1833 }
1834
1835 static int
ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1836 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1837 struct sk_buff *skb)
1838 {
1839 struct ieee80211_local *local = sdata->local;
1840 struct ieee802_11_elems *elems;
1841 struct cfg80211_chan_def chandef;
1842 struct ieee80211_channel *chan;
1843 enum nl80211_channel_type chan_type;
1844 int freq;
1845 u8 target_channel, oper_class;
1846 bool local_initiator;
1847 struct sta_info *sta;
1848 enum nl80211_band band;
1849 struct ieee80211_tdls_data *tf = (void *)skb->data;
1850 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1851 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1852 struct ieee80211_tdls_ch_sw_params params = {};
1853 int ret = 0;
1854
1855 lockdep_assert_wiphy(local->hw.wiphy);
1856
1857 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1858 params.timestamp = rx_status->device_timestamp;
1859
1860 if (skb->len < baselen) {
1861 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1862 skb->len);
1863 return -EINVAL;
1864 }
1865
1866 target_channel = tf->u.chan_switch_req.target_channel;
1867 oper_class = tf->u.chan_switch_req.oper_class;
1868
1869 /*
1870 * We can't easily infer the channel band. The operating class is
1871 * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1872 * solution here is to treat channels with number >14 as 5GHz ones,
1873 * and specifically check for the (oper_class, channel) combinations
1874 * where this doesn't hold. These are thankfully unique according to
1875 * IEEE802.11-2012.
1876 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1877 * valid here.
1878 */
1879 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1880 oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1881 target_channel < 14)
1882 band = NL80211_BAND_5GHZ;
1883 else
1884 band = target_channel < 14 ? NL80211_BAND_2GHZ :
1885 NL80211_BAND_5GHZ;
1886
1887 freq = ieee80211_channel_to_frequency(target_channel, band);
1888 if (freq == 0) {
1889 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1890 target_channel);
1891 return -EINVAL;
1892 }
1893
1894 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1895 if (!chan) {
1896 tdls_dbg(sdata,
1897 "Unsupported channel for TDLS chan switch: %d\n",
1898 target_channel);
1899 return -EINVAL;
1900 }
1901
1902 elems = ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1903 skb->len - baselen,
1904 IEEE80211_FTYPE_MGMT |
1905 IEEE80211_STYPE_ACTION,
1906 NULL);
1907 if (!elems)
1908 return -ENOMEM;
1909
1910 if (elems->parse_error) {
1911 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1912 ret = -EINVAL;
1913 goto free;
1914 }
1915
1916 if (!elems->ch_sw_timing || !elems->lnk_id) {
1917 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1918 ret = -EINVAL;
1919 goto free;
1920 }
1921
1922 if (!elems->sec_chan_offs) {
1923 chan_type = NL80211_CHAN_HT20;
1924 } else {
1925 switch (elems->sec_chan_offs->sec_chan_offs) {
1926 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1927 chan_type = NL80211_CHAN_HT40PLUS;
1928 break;
1929 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1930 chan_type = NL80211_CHAN_HT40MINUS;
1931 break;
1932 default:
1933 chan_type = NL80211_CHAN_HT20;
1934 break;
1935 }
1936 }
1937
1938 cfg80211_chandef_create(&chandef, chan, chan_type);
1939
1940 /* we will be active on the TDLS link */
1941 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1942 sdata->wdev.iftype)) {
1943 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1944 ret = -EINVAL;
1945 goto free;
1946 }
1947
1948 sta = sta_info_get(sdata, tf->sa);
1949 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1950 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1951 tf->sa);
1952 ret = -EINVAL;
1953 goto out;
1954 }
1955
1956 params.sta = &sta->sta;
1957
1958 /* validate the initiator is set correctly */
1959 local_initiator =
1960 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1961 if (local_initiator == sta->sta.tdls_initiator) {
1962 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1963 ret = -EINVAL;
1964 goto out;
1965 }
1966
1967 /* peer should have known better */
1968 if (!sta->sta.deflink.ht_cap.ht_supported && elems->sec_chan_offs &&
1969 elems->sec_chan_offs->sec_chan_offs) {
1970 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1971 ret = -EOPNOTSUPP;
1972 goto out;
1973 }
1974
1975 params.chandef = &chandef;
1976 params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time);
1977 params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout);
1978
1979 params.tmpl_skb =
1980 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1981 ¶ms.ch_sw_tm_ie);
1982 if (!params.tmpl_skb) {
1983 ret = -ENOENT;
1984 goto out;
1985 }
1986
1987 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms);
1988
1989 tdls_dbg(sdata,
1990 "TDLS ch switch request received from %pM ch %d width %d\n",
1991 tf->sa, params.chandef->chan->center_freq,
1992 params.chandef->width);
1993 out:
1994 dev_kfree_skb_any(params.tmpl_skb);
1995 free:
1996 kfree(elems);
1997 return ret;
1998 }
1999
2000 void
ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)2001 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
2002 struct sk_buff *skb)
2003 {
2004 struct ieee80211_tdls_data *tf = (void *)skb->data;
2005 struct wiphy *wiphy = sdata->local->hw.wiphy;
2006
2007 lockdep_assert_wiphy(wiphy);
2008
2009 /* make sure the driver supports it */
2010 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
2011 return;
2012
2013 /* we want to access the entire packet */
2014 if (skb_linearize(skb))
2015 return;
2016 /*
2017 * The packet/size was already validated by mac80211 Rx path, only look
2018 * at the action type.
2019 */
2020 switch (tf->action_code) {
2021 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
2022 ieee80211_process_tdls_channel_switch_req(sdata, skb);
2023 break;
2024 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
2025 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
2026 break;
2027 default:
2028 WARN_ON_ONCE(1);
2029 return;
2030 }
2031 }
2032
ieee80211_teardown_tdls_peers(struct ieee80211_link_data * link)2033 void ieee80211_teardown_tdls_peers(struct ieee80211_link_data *link)
2034 {
2035 struct ieee80211_sub_if_data *sdata = link->sdata;
2036 struct sta_info *sta;
2037 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
2038
2039 rcu_read_lock();
2040 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
2041 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
2042 !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2043 continue;
2044
2045 if (sta->deflink.link_id != link->link_id)
2046 continue;
2047
2048 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
2049 NL80211_TDLS_TEARDOWN, reason,
2050 GFP_ATOMIC);
2051 }
2052 rcu_read_unlock();
2053 }
2054
ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data * sdata,const u8 * peer,u16 reason)2055 void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata,
2056 const u8 *peer, u16 reason)
2057 {
2058 struct ieee80211_sta *sta;
2059
2060 rcu_read_lock();
2061 sta = ieee80211_find_sta(&sdata->vif, peer);
2062 if (!sta || !sta->tdls) {
2063 rcu_read_unlock();
2064 return;
2065 }
2066 rcu_read_unlock();
2067
2068 tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n",
2069 peer, reason,
2070 ieee80211_get_reason_code_string(reason));
2071
2072 ieee80211_tdls_oper_request(&sdata->vif, peer,
2073 NL80211_TDLS_TEARDOWN,
2074 WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE,
2075 GFP_ATOMIC);
2076 }
2077