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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[mirror_ubuntu-bionic-kernel.git] / net / mac80211 / tdls.c
1 /*
2 * mac80211 TDLS handling code
3 *
4 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
5 * Copyright 2014, Intel Corporation
6 * Copyright 2014 Intel Mobile Communications GmbH
7 * Copyright 2015 - 2016 Intel Deutschland GmbH
8 *
9 * This file is GPLv2 as found in COPYING.
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
20 /* give usermode some time for retries in setting up the TDLS session */
21 #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ)
22
23 void ieee80211_tdls_peer_del_work(struct work_struct *wk)
24 {
25 struct ieee80211_sub_if_data *sdata;
26 struct ieee80211_local *local;
27
28 sdata = container_of(wk, struct ieee80211_sub_if_data,
29 u.mgd.tdls_peer_del_work.work);
30 local = sdata->local;
31
32 mutex_lock(&local->mtx);
33 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
34 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
35 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
36 eth_zero_addr(sdata->u.mgd.tdls_peer);
37 }
38 mutex_unlock(&local->mtx);
39 }
40
41 static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata,
42 struct sk_buff *skb)
43 {
44 struct ieee80211_local *local = sdata->local;
45 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
46 bool chan_switch = local->hw.wiphy->features &
47 NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
48 bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
49 !ifmgd->tdls_wider_bw_prohibited;
50 struct ieee80211_supported_band *sband = ieee80211_get_sband(sdata);
51 bool vht = sband && sband->vht_cap.vht_supported;
52 u8 *pos = skb_put(skb, 10);
53
54 *pos++ = WLAN_EID_EXT_CAPABILITY;
55 *pos++ = 8; /* len */
56 *pos++ = 0x0;
57 *pos++ = 0x0;
58 *pos++ = 0x0;
59 *pos++ = chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0;
60 *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
61 *pos++ = 0;
62 *pos++ = 0;
63 *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
64 }
65
66 static u8
67 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
68 struct sk_buff *skb, u16 start, u16 end,
69 u16 spacing)
70 {
71 u8 subband_cnt = 0, ch_cnt = 0;
72 struct ieee80211_channel *ch;
73 struct cfg80211_chan_def chandef;
74 int i, subband_start;
75 struct wiphy *wiphy = sdata->local->hw.wiphy;
76
77 for (i = start; i <= end; i += spacing) {
78 if (!ch_cnt)
79 subband_start = i;
80
81 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
82 if (ch) {
83 /* we will be active on the channel */
84 cfg80211_chandef_create(&chandef, ch,
85 NL80211_CHAN_NO_HT);
86 if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
87 sdata->wdev.iftype)) {
88 ch_cnt++;
89 /*
90 * check if the next channel is also part of
91 * this allowed range
92 */
93 continue;
94 }
95 }
96
97 /*
98 * we've reached the end of a range, with allowed channels
99 * found
100 */
101 if (ch_cnt) {
102 u8 *pos = skb_put(skb, 2);
103 *pos++ = ieee80211_frequency_to_channel(subband_start);
104 *pos++ = ch_cnt;
105
106 subband_cnt++;
107 ch_cnt = 0;
108 }
109 }
110
111 /* all channels in the requested range are allowed - add them here */
112 if (ch_cnt) {
113 u8 *pos = skb_put(skb, 2);
114 *pos++ = ieee80211_frequency_to_channel(subband_start);
115 *pos++ = ch_cnt;
116
117 subband_cnt++;
118 }
119
120 return subband_cnt;
121 }
122
123 static void
124 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
125 struct sk_buff *skb)
126 {
127 /*
128 * Add possible channels for TDLS. These are channels that are allowed
129 * to be active.
130 */
131 u8 subband_cnt;
132 u8 *pos = skb_put(skb, 2);
133
134 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
135
136 /*
137 * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
138 * this doesn't happen in real world scenarios.
139 */
140
141 /* 2GHz, with 5MHz spacing */
142 subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
143
144 /* 5GHz, with 20MHz spacing */
145 subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
146
147 /* length */
148 *pos = 2 * subband_cnt;
149 }
150
151 static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata,
152 struct sk_buff *skb)
153 {
154 u8 *pos;
155 u8 op_class;
156
157 if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef,
158 &op_class))
159 return;
160
161 pos = skb_put(skb, 4);
162 *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
163 *pos++ = 2; /* len */
164
165 *pos++ = op_class;
166 *pos++ = op_class; /* give current operating class as alternate too */
167 }
168
169 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
170 {
171 u8 *pos = skb_put(skb, 3);
172
173 *pos++ = WLAN_EID_BSS_COEX_2040;
174 *pos++ = 1; /* len */
175
176 *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
177 }
178
179 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
180 u16 status_code)
181 {
182 struct ieee80211_supported_band *sband;
183
184 /* The capability will be 0 when sending a failure code */
185 if (status_code != 0)
186 return 0;
187
188 sband = ieee80211_get_sband(sdata);
189 if (sband && sband->band == NL80211_BAND_2GHZ) {
190 return WLAN_CAPABILITY_SHORT_SLOT_TIME |
191 WLAN_CAPABILITY_SHORT_PREAMBLE;
192 }
193
194 return 0;
195 }
196
197 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
198 struct sk_buff *skb, const u8 *peer,
199 bool initiator)
200 {
201 struct ieee80211_tdls_lnkie *lnkid;
202 const u8 *init_addr, *rsp_addr;
203
204 if (initiator) {
205 init_addr = sdata->vif.addr;
206 rsp_addr = peer;
207 } else {
208 init_addr = peer;
209 rsp_addr = sdata->vif.addr;
210 }
211
212 lnkid = skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
213
214 lnkid->ie_type = WLAN_EID_LINK_ID;
215 lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
216
217 memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
218 memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
219 memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
220 }
221
222 static void
223 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
224 {
225 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
226 u8 *pos = skb_put(skb, 4);
227
228 *pos++ = WLAN_EID_AID;
229 *pos++ = 2; /* len */
230 put_unaligned_le16(ifmgd->aid, pos);
231 }
232
233 /* translate numbering in the WMM parameter IE to the mac80211 notation */
234 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
235 {
236 switch (ac) {
237 default:
238 WARN_ON_ONCE(1);
239 case 0:
240 return IEEE80211_AC_BE;
241 case 1:
242 return IEEE80211_AC_BK;
243 case 2:
244 return IEEE80211_AC_VI;
245 case 3:
246 return IEEE80211_AC_VO;
247 }
248 }
249
250 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
251 {
252 u8 ret;
253
254 ret = aifsn & 0x0f;
255 if (acm)
256 ret |= 0x10;
257 ret |= (aci << 5) & 0x60;
258 return ret;
259 }
260
261 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
262 {
263 return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
264 ((ilog2(cw_max + 1) << 0x4) & 0xf0);
265 }
266
267 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
268 struct sk_buff *skb)
269 {
270 struct ieee80211_wmm_param_ie *wmm;
271 struct ieee80211_tx_queue_params *txq;
272 int i;
273
274 wmm = skb_put_zero(skb, sizeof(*wmm));
275
276 wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
277 wmm->len = sizeof(*wmm) - 2;
278
279 wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
280 wmm->oui[1] = 0x50;
281 wmm->oui[2] = 0xf2;
282 wmm->oui_type = 2; /* WME */
283 wmm->oui_subtype = 1; /* WME param */
284 wmm->version = 1; /* WME ver */
285 wmm->qos_info = 0; /* U-APSD not in use */
286
287 /*
288 * Use the EDCA parameters defined for the BSS, or default if the AP
289 * doesn't support it, as mandated by 802.11-2012 section 10.22.4
290 */
291 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
292 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
293 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
294 txq->acm, i);
295 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
296 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
297 }
298 }
299
300 static void
301 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
302 struct sta_info *sta)
303 {
304 /* IEEE802.11ac-2013 Table E-4 */
305 u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
306 struct cfg80211_chan_def uc = sta->tdls_chandef;
307 enum nl80211_chan_width max_width = ieee80211_sta_cap_chan_bw(sta);
308 int i;
309
310 /* only support upgrading non-narrow channels up to 80Mhz */
311 if (max_width == NL80211_CHAN_WIDTH_5 ||
312 max_width == NL80211_CHAN_WIDTH_10)
313 return;
314
315 if (max_width > NL80211_CHAN_WIDTH_80)
316 max_width = NL80211_CHAN_WIDTH_80;
317
318 if (uc.width >= max_width)
319 return;
320 /*
321 * Channel usage constrains in the IEEE802.11ac-2013 specification only
322 * allow expanding a 20MHz channel to 80MHz in a single way. In
323 * addition, there are no 40MHz allowed channels that are not part of
324 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
325 */
326 for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
327 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
328 uc.center_freq1 = centers_80mhz[i];
329 uc.center_freq2 = 0;
330 uc.width = NL80211_CHAN_WIDTH_80;
331 break;
332 }
333
334 if (!uc.center_freq1)
335 return;
336
337 /* proceed to downgrade the chandef until usable or the same as AP BW */
338 while (uc.width > max_width ||
339 (uc.width > sta->tdls_chandef.width &&
340 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
341 sdata->wdev.iftype)))
342 ieee80211_chandef_downgrade(&uc);
343
344 if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
345 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
346 sta->tdls_chandef.width, uc.width);
347
348 /*
349 * the station is not yet authorized when BW upgrade is done,
350 * locking is not required
351 */
352 sta->tdls_chandef = uc;
353 }
354 }
355
356 static void
357 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
358 struct sk_buff *skb, const u8 *peer,
359 u8 action_code, bool initiator,
360 const u8 *extra_ies, size_t extra_ies_len)
361 {
362 struct ieee80211_supported_band *sband;
363 struct ieee80211_local *local = sdata->local;
364 struct ieee80211_sta_ht_cap ht_cap;
365 struct ieee80211_sta_vht_cap vht_cap;
366 struct sta_info *sta = NULL;
367 size_t offset = 0, noffset;
368 u8 *pos;
369
370 sband = ieee80211_get_sband(sdata);
371 if (!sband)
372 return;
373
374 ieee80211_add_srates_ie(sdata, skb, false, sband->band);
375 ieee80211_add_ext_srates_ie(sdata, skb, false, sband->band);
376 ieee80211_tdls_add_supp_channels(sdata, skb);
377
378 /* add any custom IEs that go before Extended Capabilities */
379 if (extra_ies_len) {
380 static const u8 before_ext_cap[] = {
381 WLAN_EID_SUPP_RATES,
382 WLAN_EID_COUNTRY,
383 WLAN_EID_EXT_SUPP_RATES,
384 WLAN_EID_SUPPORTED_CHANNELS,
385 WLAN_EID_RSN,
386 };
387 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
388 before_ext_cap,
389 ARRAY_SIZE(before_ext_cap),
390 offset);
391 skb_put_data(skb, extra_ies + offset, noffset - offset);
392 offset = noffset;
393 }
394
395 ieee80211_tdls_add_ext_capab(sdata, skb);
396
397 /* add the QoS element if we support it */
398 if (local->hw.queues >= IEEE80211_NUM_ACS &&
399 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
400 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
401
402 /* add any custom IEs that go before HT capabilities */
403 if (extra_ies_len) {
404 static const u8 before_ht_cap[] = {
405 WLAN_EID_SUPP_RATES,
406 WLAN_EID_COUNTRY,
407 WLAN_EID_EXT_SUPP_RATES,
408 WLAN_EID_SUPPORTED_CHANNELS,
409 WLAN_EID_RSN,
410 WLAN_EID_EXT_CAPABILITY,
411 WLAN_EID_QOS_CAPA,
412 WLAN_EID_FAST_BSS_TRANSITION,
413 WLAN_EID_TIMEOUT_INTERVAL,
414 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
415 };
416 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
417 before_ht_cap,
418 ARRAY_SIZE(before_ht_cap),
419 offset);
420 skb_put_data(skb, extra_ies + offset, noffset - offset);
421 offset = noffset;
422 }
423
424 mutex_lock(&local->sta_mtx);
425
426 /* we should have the peer STA if we're already responding */
427 if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
428 sta = sta_info_get(sdata, peer);
429 if (WARN_ON_ONCE(!sta)) {
430 mutex_unlock(&local->sta_mtx);
431 return;
432 }
433
434 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
435 }
436
437 ieee80211_tdls_add_oper_classes(sdata, skb);
438
439 /*
440 * with TDLS we can switch channels, and HT-caps are not necessarily
441 * the same on all bands. The specification limits the setup to a
442 * single HT-cap, so use the current band for now.
443 */
444 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
445
446 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
447 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
448 ht_cap.ht_supported) {
449 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
450
451 /* disable SMPS in TDLS initiator */
452 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
453 << IEEE80211_HT_CAP_SM_PS_SHIFT;
454
455 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
456 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
457 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
458 ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
459 /* the peer caps are already intersected with our own */
460 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
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 }
465
466 if (ht_cap.ht_supported &&
467 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
468 ieee80211_tdls_add_bss_coex_ie(skb);
469
470 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
471
472 /* add any custom IEs that go before VHT capabilities */
473 if (extra_ies_len) {
474 static const u8 before_vht_cap[] = {
475 WLAN_EID_SUPP_RATES,
476 WLAN_EID_COUNTRY,
477 WLAN_EID_EXT_SUPP_RATES,
478 WLAN_EID_SUPPORTED_CHANNELS,
479 WLAN_EID_RSN,
480 WLAN_EID_EXT_CAPABILITY,
481 WLAN_EID_QOS_CAPA,
482 WLAN_EID_FAST_BSS_TRANSITION,
483 WLAN_EID_TIMEOUT_INTERVAL,
484 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
485 WLAN_EID_MULTI_BAND,
486 };
487 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
488 before_vht_cap,
489 ARRAY_SIZE(before_vht_cap),
490 offset);
491 skb_put_data(skb, extra_ies + offset, noffset - offset);
492 offset = noffset;
493 }
494
495 /* build the VHT-cap similarly to the HT-cap */
496 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
497 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
498 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
499 vht_cap.vht_supported) {
500 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
501
502 /* the AID is present only when VHT is implemented */
503 if (action_code == WLAN_TDLS_SETUP_REQUEST)
504 ieee80211_tdls_add_aid(sdata, skb);
505
506 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
507 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
508 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
509 vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
510 /* the peer caps are already intersected with our own */
511 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
512
513 /* the AID is present only when VHT is implemented */
514 ieee80211_tdls_add_aid(sdata, skb);
515
516 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
517 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
518
519 /*
520 * if both peers support WIDER_BW, we can expand the chandef to
521 * a wider compatible one, up to 80MHz
522 */
523 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
524 ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
525 }
526
527 mutex_unlock(&local->sta_mtx);
528
529 /* add any remaining IEs */
530 if (extra_ies_len) {
531 noffset = extra_ies_len;
532 skb_put_data(skb, extra_ies + offset, noffset - offset);
533 }
534
535 }
536
537 static void
538 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
539 struct sk_buff *skb, const u8 *peer,
540 bool initiator, const u8 *extra_ies,
541 size_t extra_ies_len)
542 {
543 struct ieee80211_local *local = sdata->local;
544 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
545 size_t offset = 0, noffset;
546 struct sta_info *sta, *ap_sta;
547 struct ieee80211_supported_band *sband;
548 u8 *pos;
549
550 sband = ieee80211_get_sband(sdata);
551 if (!sband)
552 return;
553
554 mutex_lock(&local->sta_mtx);
555
556 sta = sta_info_get(sdata, peer);
557 ap_sta = sta_info_get(sdata, ifmgd->bssid);
558 if (WARN_ON_ONCE(!sta || !ap_sta)) {
559 mutex_unlock(&local->sta_mtx);
560 return;
561 }
562
563 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
564
565 /* add any custom IEs that go before the QoS IE */
566 if (extra_ies_len) {
567 static const u8 before_qos[] = {
568 WLAN_EID_RSN,
569 };
570 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
571 before_qos,
572 ARRAY_SIZE(before_qos),
573 offset);
574 skb_put_data(skb, extra_ies + offset, noffset - offset);
575 offset = noffset;
576 }
577
578 /* add the QoS param IE if both the peer and we support it */
579 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
580 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
581
582 /* add any custom IEs that go before HT operation */
583 if (extra_ies_len) {
584 static const u8 before_ht_op[] = {
585 WLAN_EID_RSN,
586 WLAN_EID_QOS_CAPA,
587 WLAN_EID_FAST_BSS_TRANSITION,
588 WLAN_EID_TIMEOUT_INTERVAL,
589 };
590 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
591 before_ht_op,
592 ARRAY_SIZE(before_ht_op),
593 offset);
594 skb_put_data(skb, extra_ies + offset, noffset - offset);
595 offset = noffset;
596 }
597
598 /*
599 * if HT support is only added in TDLS, we need an HT-operation IE.
600 * add the IE as required by IEEE802.11-2012 9.23.3.2.
601 */
602 if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
603 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
604 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
605 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
606
607 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
608 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
609 &sdata->vif.bss_conf.chandef, prot,
610 true);
611 }
612
613 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
614
615 /* only include VHT-operation if not on the 2.4GHz band */
616 if (sband->band != NL80211_BAND_2GHZ &&
617 sta->sta.vht_cap.vht_supported) {
618 /*
619 * if both peers support WIDER_BW, we can expand the chandef to
620 * a wider compatible one, up to 80MHz
621 */
622 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
623 ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
624
625 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
626 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
627 &sta->tdls_chandef);
628 }
629
630 mutex_unlock(&local->sta_mtx);
631
632 /* add any remaining IEs */
633 if (extra_ies_len) {
634 noffset = extra_ies_len;
635 skb_put_data(skb, extra_ies + offset, noffset - offset);
636 }
637 }
638
639 static void
640 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
641 struct sk_buff *skb, const u8 *peer,
642 bool initiator, const u8 *extra_ies,
643 size_t extra_ies_len, u8 oper_class,
644 struct cfg80211_chan_def *chandef)
645 {
646 struct ieee80211_tdls_data *tf;
647 size_t offset = 0, noffset;
648
649 if (WARN_ON_ONCE(!chandef))
650 return;
651
652 tf = (void *)skb->data;
653 tf->u.chan_switch_req.target_channel =
654 ieee80211_frequency_to_channel(chandef->chan->center_freq);
655 tf->u.chan_switch_req.oper_class = oper_class;
656
657 if (extra_ies_len) {
658 static const u8 before_lnkie[] = {
659 WLAN_EID_SECONDARY_CHANNEL_OFFSET,
660 };
661 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
662 before_lnkie,
663 ARRAY_SIZE(before_lnkie),
664 offset);
665 skb_put_data(skb, extra_ies + offset, noffset - offset);
666 offset = noffset;
667 }
668
669 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
670
671 /* add any remaining IEs */
672 if (extra_ies_len) {
673 noffset = extra_ies_len;
674 skb_put_data(skb, extra_ies + offset, noffset - offset);
675 }
676 }
677
678 static void
679 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
680 struct sk_buff *skb, const u8 *peer,
681 u16 status_code, bool initiator,
682 const u8 *extra_ies,
683 size_t extra_ies_len)
684 {
685 if (status_code == 0)
686 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
687
688 if (extra_ies_len)
689 skb_put_data(skb, extra_ies, extra_ies_len);
690 }
691
692 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
693 struct sk_buff *skb, const u8 *peer,
694 u8 action_code, u16 status_code,
695 bool initiator, const u8 *extra_ies,
696 size_t extra_ies_len, u8 oper_class,
697 struct cfg80211_chan_def *chandef)
698 {
699 switch (action_code) {
700 case WLAN_TDLS_SETUP_REQUEST:
701 case WLAN_TDLS_SETUP_RESPONSE:
702 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
703 if (status_code == 0)
704 ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
705 action_code,
706 initiator,
707 extra_ies,
708 extra_ies_len);
709 break;
710 case WLAN_TDLS_SETUP_CONFIRM:
711 if (status_code == 0)
712 ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
713 initiator, extra_ies,
714 extra_ies_len);
715 break;
716 case WLAN_TDLS_TEARDOWN:
717 case WLAN_TDLS_DISCOVERY_REQUEST:
718 if (extra_ies_len)
719 skb_put_data(skb, extra_ies, extra_ies_len);
720 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
721 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
722 break;
723 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
724 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
725 initiator, extra_ies,
726 extra_ies_len,
727 oper_class, chandef);
728 break;
729 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
730 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
731 status_code,
732 initiator, extra_ies,
733 extra_ies_len);
734 break;
735 }
736
737 }
738
739 static int
740 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
741 const u8 *peer, u8 action_code, u8 dialog_token,
742 u16 status_code, struct sk_buff *skb)
743 {
744 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
745 struct ieee80211_tdls_data *tf;
746
747 tf = skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
748
749 memcpy(tf->da, peer, ETH_ALEN);
750 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
751 tf->ether_type = cpu_to_be16(ETH_P_TDLS);
752 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
753
754 /* network header is after the ethernet header */
755 skb_set_network_header(skb, ETH_HLEN);
756
757 switch (action_code) {
758 case WLAN_TDLS_SETUP_REQUEST:
759 tf->category = WLAN_CATEGORY_TDLS;
760 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
761
762 skb_put(skb, sizeof(tf->u.setup_req));
763 tf->u.setup_req.dialog_token = dialog_token;
764 tf->u.setup_req.capability =
765 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
766 status_code));
767 break;
768 case WLAN_TDLS_SETUP_RESPONSE:
769 tf->category = WLAN_CATEGORY_TDLS;
770 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
771
772 skb_put(skb, sizeof(tf->u.setup_resp));
773 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
774 tf->u.setup_resp.dialog_token = dialog_token;
775 tf->u.setup_resp.capability =
776 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
777 status_code));
778 break;
779 case WLAN_TDLS_SETUP_CONFIRM:
780 tf->category = WLAN_CATEGORY_TDLS;
781 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
782
783 skb_put(skb, sizeof(tf->u.setup_cfm));
784 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
785 tf->u.setup_cfm.dialog_token = dialog_token;
786 break;
787 case WLAN_TDLS_TEARDOWN:
788 tf->category = WLAN_CATEGORY_TDLS;
789 tf->action_code = WLAN_TDLS_TEARDOWN;
790
791 skb_put(skb, sizeof(tf->u.teardown));
792 tf->u.teardown.reason_code = cpu_to_le16(status_code);
793 break;
794 case WLAN_TDLS_DISCOVERY_REQUEST:
795 tf->category = WLAN_CATEGORY_TDLS;
796 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
797
798 skb_put(skb, sizeof(tf->u.discover_req));
799 tf->u.discover_req.dialog_token = dialog_token;
800 break;
801 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
802 tf->category = WLAN_CATEGORY_TDLS;
803 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
804
805 skb_put(skb, sizeof(tf->u.chan_switch_req));
806 break;
807 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
808 tf->category = WLAN_CATEGORY_TDLS;
809 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
810
811 skb_put(skb, sizeof(tf->u.chan_switch_resp));
812 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
813 break;
814 default:
815 return -EINVAL;
816 }
817
818 return 0;
819 }
820
821 static int
822 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
823 const u8 *peer, u8 action_code, u8 dialog_token,
824 u16 status_code, struct sk_buff *skb)
825 {
826 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
827 struct ieee80211_mgmt *mgmt;
828
829 mgmt = skb_put_zero(skb, 24);
830 memcpy(mgmt->da, peer, ETH_ALEN);
831 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
832 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
833
834 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
835 IEEE80211_STYPE_ACTION);
836
837 switch (action_code) {
838 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
839 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
840 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
841 mgmt->u.action.u.tdls_discover_resp.action_code =
842 WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
843 mgmt->u.action.u.tdls_discover_resp.dialog_token =
844 dialog_token;
845 mgmt->u.action.u.tdls_discover_resp.capability =
846 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
847 status_code));
848 break;
849 default:
850 return -EINVAL;
851 }
852
853 return 0;
854 }
855
856 static struct sk_buff *
857 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
858 const u8 *peer, u8 action_code,
859 u8 dialog_token, u16 status_code,
860 bool initiator, const u8 *extra_ies,
861 size_t extra_ies_len, u8 oper_class,
862 struct cfg80211_chan_def *chandef)
863 {
864 struct ieee80211_local *local = sdata->local;
865 struct sk_buff *skb;
866 int ret;
867
868 skb = netdev_alloc_skb(sdata->dev,
869 local->hw.extra_tx_headroom +
870 max(sizeof(struct ieee80211_mgmt),
871 sizeof(struct ieee80211_tdls_data)) +
872 50 + /* supported rates */
873 10 + /* ext capab */
874 26 + /* max(WMM-info, WMM-param) */
875 2 + max(sizeof(struct ieee80211_ht_cap),
876 sizeof(struct ieee80211_ht_operation)) +
877 2 + max(sizeof(struct ieee80211_vht_cap),
878 sizeof(struct ieee80211_vht_operation)) +
879 50 + /* supported channels */
880 3 + /* 40/20 BSS coex */
881 4 + /* AID */
882 4 + /* oper classes */
883 extra_ies_len +
884 sizeof(struct ieee80211_tdls_lnkie));
885 if (!skb)
886 return NULL;
887
888 skb_reserve(skb, local->hw.extra_tx_headroom);
889
890 switch (action_code) {
891 case WLAN_TDLS_SETUP_REQUEST:
892 case WLAN_TDLS_SETUP_RESPONSE:
893 case WLAN_TDLS_SETUP_CONFIRM:
894 case WLAN_TDLS_TEARDOWN:
895 case WLAN_TDLS_DISCOVERY_REQUEST:
896 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
897 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
898 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
899 sdata->dev, peer,
900 action_code, dialog_token,
901 status_code, skb);
902 break;
903 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
904 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
905 peer, action_code,
906 dialog_token, status_code,
907 skb);
908 break;
909 default:
910 ret = -ENOTSUPP;
911 break;
912 }
913
914 if (ret < 0)
915 goto fail;
916
917 ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
918 initiator, extra_ies, extra_ies_len, oper_class,
919 chandef);
920 return skb;
921
922 fail:
923 dev_kfree_skb(skb);
924 return NULL;
925 }
926
927 static int
928 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
929 const u8 *peer, u8 action_code, u8 dialog_token,
930 u16 status_code, u32 peer_capability,
931 bool initiator, const u8 *extra_ies,
932 size_t extra_ies_len, u8 oper_class,
933 struct cfg80211_chan_def *chandef)
934 {
935 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
936 struct sk_buff *skb = NULL;
937 struct sta_info *sta;
938 u32 flags = 0;
939 int ret = 0;
940
941 rcu_read_lock();
942 sta = sta_info_get(sdata, peer);
943
944 /* infer the initiator if we can, to support old userspace */
945 switch (action_code) {
946 case WLAN_TDLS_SETUP_REQUEST:
947 if (sta) {
948 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
949 sta->sta.tdls_initiator = false;
950 }
951 /* fall-through */
952 case WLAN_TDLS_SETUP_CONFIRM:
953 case WLAN_TDLS_DISCOVERY_REQUEST:
954 initiator = true;
955 break;
956 case WLAN_TDLS_SETUP_RESPONSE:
957 /*
958 * In some testing scenarios, we send a request and response.
959 * Make the last packet sent take effect for the initiator
960 * value.
961 */
962 if (sta) {
963 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
964 sta->sta.tdls_initiator = true;
965 }
966 /* fall-through */
967 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
968 initiator = false;
969 break;
970 case WLAN_TDLS_TEARDOWN:
971 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
972 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
973 /* any value is ok */
974 break;
975 default:
976 ret = -ENOTSUPP;
977 break;
978 }
979
980 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
981 initiator = true;
982
983 rcu_read_unlock();
984 if (ret < 0)
985 goto fail;
986
987 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
988 dialog_token, status_code,
989 initiator, extra_ies,
990 extra_ies_len, oper_class,
991 chandef);
992 if (!skb) {
993 ret = -EINVAL;
994 goto fail;
995 }
996
997 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
998 ieee80211_tx_skb(sdata, skb);
999 return 0;
1000 }
1001
1002 /*
1003 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1004 * we should default to AC_VI.
1005 */
1006 switch (action_code) {
1007 case WLAN_TDLS_SETUP_REQUEST:
1008 case WLAN_TDLS_SETUP_RESPONSE:
1009 skb_set_queue_mapping(skb, IEEE80211_AC_BK);
1010 skb->priority = 2;
1011 break;
1012 default:
1013 skb_set_queue_mapping(skb, IEEE80211_AC_VI);
1014 skb->priority = 5;
1015 break;
1016 }
1017
1018 /*
1019 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1020 * Later, if no ACK is returned from peer, we will re-send the teardown
1021 * packet through the AP.
1022 */
1023 if ((action_code == WLAN_TDLS_TEARDOWN) &&
1024 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1025 bool try_resend; /* Should we keep skb for possible resend */
1026
1027 /* If not sending directly to peer - no point in keeping skb */
1028 rcu_read_lock();
1029 sta = sta_info_get(sdata, peer);
1030 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1031 rcu_read_unlock();
1032
1033 spin_lock_bh(&sdata->u.mgd.teardown_lock);
1034 if (try_resend && !sdata->u.mgd.teardown_skb) {
1035 /* Mark it as requiring TX status callback */
1036 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1037 IEEE80211_TX_INTFL_MLME_CONN_TX;
1038
1039 /*
1040 * skb is copied since mac80211 will later set
1041 * properties that might not be the same as the AP,
1042 * such as encryption, QoS, addresses, etc.
1043 *
1044 * No problem if skb_copy() fails, so no need to check.
1045 */
1046 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1047 sdata->u.mgd.orig_teardown_skb = skb;
1048 }
1049 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1050 }
1051
1052 /* disable bottom halves when entering the Tx path */
1053 local_bh_disable();
1054 __ieee80211_subif_start_xmit(skb, dev, flags);
1055 local_bh_enable();
1056
1057 return ret;
1058
1059 fail:
1060 dev_kfree_skb(skb);
1061 return ret;
1062 }
1063
1064 static int
1065 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1066 const u8 *peer, u8 action_code, u8 dialog_token,
1067 u16 status_code, u32 peer_capability, bool initiator,
1068 const u8 *extra_ies, size_t extra_ies_len)
1069 {
1070 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1071 struct ieee80211_local *local = sdata->local;
1072 enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode;
1073 int ret;
1074
1075 /* don't support setup with forced SMPS mode that's not off */
1076 if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1077 smps_mode != IEEE80211_SMPS_OFF) {
1078 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1079 smps_mode);
1080 return -ENOTSUPP;
1081 }
1082
1083 mutex_lock(&local->mtx);
1084
1085 /* we don't support concurrent TDLS peer setups */
1086 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1087 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1088 ret = -EBUSY;
1089 goto out_unlock;
1090 }
1091
1092 /*
1093 * make sure we have a STA representing the peer so we drop or buffer
1094 * non-TDLS-setup frames to the peer. We can't send other packets
1095 * during setup through the AP path.
1096 * Allow error packets to be sent - sometimes we don't even add a STA
1097 * before failing the setup.
1098 */
1099 if (status_code == 0) {
1100 rcu_read_lock();
1101 if (!sta_info_get(sdata, peer)) {
1102 rcu_read_unlock();
1103 ret = -ENOLINK;
1104 goto out_unlock;
1105 }
1106 rcu_read_unlock();
1107 }
1108
1109 ieee80211_flush_queues(local, sdata, false);
1110 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1111 mutex_unlock(&local->mtx);
1112
1113 /* we cannot take the mutex while preparing the setup packet */
1114 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1115 dialog_token, status_code,
1116 peer_capability, initiator,
1117 extra_ies, extra_ies_len, 0,
1118 NULL);
1119 if (ret < 0) {
1120 mutex_lock(&local->mtx);
1121 eth_zero_addr(sdata->u.mgd.tdls_peer);
1122 mutex_unlock(&local->mtx);
1123 return ret;
1124 }
1125
1126 ieee80211_queue_delayed_work(&sdata->local->hw,
1127 &sdata->u.mgd.tdls_peer_del_work,
1128 TDLS_PEER_SETUP_TIMEOUT);
1129 return 0;
1130
1131 out_unlock:
1132 mutex_unlock(&local->mtx);
1133 return ret;
1134 }
1135
1136 static int
1137 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1138 const u8 *peer, u8 action_code, u8 dialog_token,
1139 u16 status_code, u32 peer_capability,
1140 bool initiator, const u8 *extra_ies,
1141 size_t extra_ies_len)
1142 {
1143 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1144 struct ieee80211_local *local = sdata->local;
1145 struct sta_info *sta;
1146 int ret;
1147
1148 /*
1149 * No packets can be transmitted to the peer via the AP during setup -
1150 * the STA is set as a TDLS peer, but is not authorized.
1151 * During teardown, we prevent direct transmissions by stopping the
1152 * queues and flushing all direct packets.
1153 */
1154 ieee80211_stop_vif_queues(local, sdata,
1155 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1156 ieee80211_flush_queues(local, sdata, false);
1157
1158 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1159 dialog_token, status_code,
1160 peer_capability, initiator,
1161 extra_ies, extra_ies_len, 0,
1162 NULL);
1163 if (ret < 0)
1164 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1165 ret);
1166
1167 /*
1168 * Remove the STA AUTH flag to force further traffic through the AP. If
1169 * the STA was unreachable, it was already removed.
1170 */
1171 rcu_read_lock();
1172 sta = sta_info_get(sdata, peer);
1173 if (sta)
1174 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1175 rcu_read_unlock();
1176
1177 ieee80211_wake_vif_queues(local, sdata,
1178 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1179
1180 return 0;
1181 }
1182
1183 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1184 const u8 *peer, u8 action_code, u8 dialog_token,
1185 u16 status_code, u32 peer_capability,
1186 bool initiator, const u8 *extra_ies,
1187 size_t extra_ies_len)
1188 {
1189 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1190 int ret;
1191
1192 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1193 return -ENOTSUPP;
1194
1195 /* make sure we are in managed mode, and associated */
1196 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1197 !sdata->u.mgd.associated)
1198 return -EINVAL;
1199
1200 switch (action_code) {
1201 case WLAN_TDLS_SETUP_REQUEST:
1202 case WLAN_TDLS_SETUP_RESPONSE:
1203 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1204 dialog_token, status_code,
1205 peer_capability, initiator,
1206 extra_ies, extra_ies_len);
1207 break;
1208 case WLAN_TDLS_TEARDOWN:
1209 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1210 action_code, dialog_token,
1211 status_code,
1212 peer_capability, initiator,
1213 extra_ies, extra_ies_len);
1214 break;
1215 case WLAN_TDLS_DISCOVERY_REQUEST:
1216 /*
1217 * Protect the discovery so we can hear the TDLS discovery
1218 * response frame. It is transmitted directly and not buffered
1219 * by the AP.
1220 */
1221 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1222 /* fall-through */
1223 case WLAN_TDLS_SETUP_CONFIRM:
1224 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1225 /* no special handling */
1226 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1227 action_code,
1228 dialog_token,
1229 status_code,
1230 peer_capability,
1231 initiator, extra_ies,
1232 extra_ies_len, 0, NULL);
1233 break;
1234 default:
1235 ret = -EOPNOTSUPP;
1236 break;
1237 }
1238
1239 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1240 action_code, peer, ret);
1241 return ret;
1242 }
1243
1244 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1245 struct sta_info *sta)
1246 {
1247 struct ieee80211_local *local = sdata->local;
1248 struct ieee80211_chanctx_conf *conf;
1249 struct ieee80211_chanctx *ctx;
1250 enum nl80211_chan_width width;
1251 struct ieee80211_supported_band *sband;
1252
1253 mutex_lock(&local->chanctx_mtx);
1254 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1255 lockdep_is_held(&local->chanctx_mtx));
1256 if (conf) {
1257 width = conf->def.width;
1258 sband = local->hw.wiphy->bands[conf->def.chan->band];
1259 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1260 ieee80211_recalc_chanctx_chantype(local, ctx);
1261
1262 /* if width changed and a peer is given, update its BW */
1263 if (width != conf->def.width && sta &&
1264 test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1265 enum ieee80211_sta_rx_bandwidth bw;
1266
1267 bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1268 bw = min(bw, ieee80211_sta_cap_rx_bw(sta));
1269 if (bw != sta->sta.bandwidth) {
1270 sta->sta.bandwidth = bw;
1271 rate_control_rate_update(local, sband, sta,
1272 IEEE80211_RC_BW_CHANGED);
1273 /*
1274 * if a TDLS peer BW was updated, we need to
1275 * recalc the chandef width again, to get the
1276 * correct chanctx min_def
1277 */
1278 ieee80211_recalc_chanctx_chantype(local, ctx);
1279 }
1280 }
1281
1282 }
1283 mutex_unlock(&local->chanctx_mtx);
1284 }
1285
1286 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1287 {
1288 struct sta_info *sta;
1289 bool result = false;
1290
1291 rcu_read_lock();
1292 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1293 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1294 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1295 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1296 !sta->sta.ht_cap.ht_supported)
1297 continue;
1298 result = true;
1299 break;
1300 }
1301 rcu_read_unlock();
1302
1303 return result;
1304 }
1305
1306 static void
1307 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1308 struct sta_info *sta)
1309 {
1310 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1311 bool tdls_ht;
1312 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1313 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1314 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1315 u16 opmode;
1316
1317 /* Nothing to do if the BSS connection uses HT */
1318 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
1319 return;
1320
1321 tdls_ht = (sta && sta->sta.ht_cap.ht_supported) ||
1322 iee80211_tdls_have_ht_peers(sdata);
1323
1324 opmode = sdata->vif.bss_conf.ht_operation_mode;
1325
1326 if (tdls_ht)
1327 opmode |= protection;
1328 else
1329 opmode &= ~protection;
1330
1331 if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1332 return;
1333
1334 sdata->vif.bss_conf.ht_operation_mode = opmode;
1335 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT);
1336 }
1337
1338 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1339 const u8 *peer, enum nl80211_tdls_operation oper)
1340 {
1341 struct sta_info *sta;
1342 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1343 struct ieee80211_local *local = sdata->local;
1344 int ret;
1345
1346 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1347 return -ENOTSUPP;
1348
1349 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1350 return -EINVAL;
1351
1352 switch (oper) {
1353 case NL80211_TDLS_ENABLE_LINK:
1354 case NL80211_TDLS_DISABLE_LINK:
1355 break;
1356 case NL80211_TDLS_TEARDOWN:
1357 case NL80211_TDLS_SETUP:
1358 case NL80211_TDLS_DISCOVERY_REQ:
1359 /* We don't support in-driver setup/teardown/discovery */
1360 return -ENOTSUPP;
1361 }
1362
1363 /* protect possible bss_conf changes and avoid concurrency in
1364 * ieee80211_bss_info_change_notify()
1365 */
1366 sdata_lock(sdata);
1367 mutex_lock(&local->mtx);
1368 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1369
1370 switch (oper) {
1371 case NL80211_TDLS_ENABLE_LINK:
1372 if (sdata->vif.csa_active) {
1373 tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1374 ret = -EBUSY;
1375 break;
1376 }
1377
1378 mutex_lock(&local->sta_mtx);
1379 sta = sta_info_get(sdata, peer);
1380 if (!sta) {
1381 mutex_unlock(&local->sta_mtx);
1382 ret = -ENOLINK;
1383 break;
1384 }
1385
1386 iee80211_tdls_recalc_chanctx(sdata, sta);
1387 iee80211_tdls_recalc_ht_protection(sdata, sta);
1388
1389 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1390 mutex_unlock(&local->sta_mtx);
1391
1392 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1393 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1394 ret = 0;
1395 break;
1396 case NL80211_TDLS_DISABLE_LINK:
1397 /*
1398 * The teardown message in ieee80211_tdls_mgmt_teardown() was
1399 * created while the queues were stopped, so it might still be
1400 * pending. Before flushing the queues we need to be sure the
1401 * message is handled by the tasklet handling pending messages,
1402 * otherwise we might start destroying the station before
1403 * sending the teardown packet.
1404 * Note that this only forces the tasklet to flush pendings -
1405 * not to stop the tasklet from rescheduling itself.
1406 */
1407 tasklet_kill(&local->tx_pending_tasklet);
1408 /* flush a potentially queued teardown packet */
1409 ieee80211_flush_queues(local, sdata, false);
1410
1411 ret = sta_info_destroy_addr(sdata, peer);
1412
1413 mutex_lock(&local->sta_mtx);
1414 iee80211_tdls_recalc_ht_protection(sdata, NULL);
1415 mutex_unlock(&local->sta_mtx);
1416
1417 iee80211_tdls_recalc_chanctx(sdata, NULL);
1418 break;
1419 default:
1420 ret = -ENOTSUPP;
1421 break;
1422 }
1423
1424 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1425 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1426 eth_zero_addr(sdata->u.mgd.tdls_peer);
1427 }
1428
1429 if (ret == 0)
1430 ieee80211_queue_work(&sdata->local->hw,
1431 &sdata->u.mgd.request_smps_work);
1432
1433 mutex_unlock(&local->mtx);
1434 sdata_unlock(sdata);
1435 return ret;
1436 }
1437
1438 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1439 enum nl80211_tdls_operation oper,
1440 u16 reason_code, gfp_t gfp)
1441 {
1442 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1443
1444 if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1445 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1446 oper);
1447 return;
1448 }
1449
1450 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1451 }
1452 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1453
1454 static void
1455 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1456 {
1457 struct ieee80211_ch_switch_timing *ch_sw;
1458
1459 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1460 *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1461
1462 ch_sw = (void *)buf;
1463 ch_sw->switch_time = cpu_to_le16(switch_time);
1464 ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1465 }
1466
1467 /* find switch timing IE in SKB ready for Tx */
1468 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1469 {
1470 struct ieee80211_tdls_data *tf;
1471 const u8 *ie_start;
1472
1473 /*
1474 * Get the offset for the new location of the switch timing IE.
1475 * The SKB network header will now point to the "payload_type"
1476 * element of the TDLS data frame struct.
1477 */
1478 tf = container_of(skb->data + skb_network_offset(skb),
1479 struct ieee80211_tdls_data, payload_type);
1480 ie_start = tf->u.chan_switch_req.variable;
1481 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1482 skb->len - (ie_start - skb->data));
1483 }
1484
1485 static struct sk_buff *
1486 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1487 struct cfg80211_chan_def *chandef,
1488 u32 *ch_sw_tm_ie_offset)
1489 {
1490 struct ieee80211_sub_if_data *sdata = sta->sdata;
1491 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1492 2 + sizeof(struct ieee80211_ch_switch_timing)];
1493 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1494 u8 *pos = extra_ies;
1495 struct sk_buff *skb;
1496
1497 /*
1498 * if chandef points to a wide channel add a Secondary-Channel
1499 * Offset information element
1500 */
1501 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1502 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1503 bool ht40plus;
1504
1505 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1506 *pos++ = sizeof(*sec_chan_ie);
1507 sec_chan_ie = (void *)pos;
1508
1509 ht40plus = cfg80211_get_chandef_type(chandef) ==
1510 NL80211_CHAN_HT40PLUS;
1511 sec_chan_ie->sec_chan_offs = ht40plus ?
1512 IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1513 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1514 pos += sizeof(*sec_chan_ie);
1515
1516 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1517 }
1518
1519 /* just set the values to 0, this is a template */
1520 iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1521
1522 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1523 WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1524 0, 0, !sta->sta.tdls_initiator,
1525 extra_ies, extra_ies_len,
1526 oper_class, chandef);
1527 if (!skb)
1528 return NULL;
1529
1530 skb = ieee80211_build_data_template(sdata, skb, 0);
1531 if (IS_ERR(skb)) {
1532 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1533 return NULL;
1534 }
1535
1536 if (ch_sw_tm_ie_offset) {
1537 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1538
1539 if (!tm_ie) {
1540 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1541 dev_kfree_skb_any(skb);
1542 return NULL;
1543 }
1544
1545 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1546 }
1547
1548 tdls_dbg(sdata,
1549 "TDLS channel switch request template for %pM ch %d width %d\n",
1550 sta->sta.addr, chandef->chan->center_freq, chandef->width);
1551 return skb;
1552 }
1553
1554 int
1555 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1556 const u8 *addr, u8 oper_class,
1557 struct cfg80211_chan_def *chandef)
1558 {
1559 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1560 struct ieee80211_local *local = sdata->local;
1561 struct sta_info *sta;
1562 struct sk_buff *skb = NULL;
1563 u32 ch_sw_tm_ie;
1564 int ret;
1565
1566 mutex_lock(&local->sta_mtx);
1567 sta = sta_info_get(sdata, addr);
1568 if (!sta) {
1569 tdls_dbg(sdata,
1570 "Invalid TDLS peer %pM for channel switch request\n",
1571 addr);
1572 ret = -ENOENT;
1573 goto out;
1574 }
1575
1576 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1577 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1578 addr);
1579 ret = -ENOTSUPP;
1580 goto out;
1581 }
1582
1583 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1584 &ch_sw_tm_ie);
1585 if (!skb) {
1586 ret = -ENOENT;
1587 goto out;
1588 }
1589
1590 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1591 chandef, skb, ch_sw_tm_ie);
1592 if (!ret)
1593 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1594
1595 out:
1596 mutex_unlock(&local->sta_mtx);
1597 dev_kfree_skb_any(skb);
1598 return ret;
1599 }
1600
1601 void
1602 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1603 struct net_device *dev,
1604 const u8 *addr)
1605 {
1606 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1607 struct ieee80211_local *local = sdata->local;
1608 struct sta_info *sta;
1609
1610 mutex_lock(&local->sta_mtx);
1611 sta = sta_info_get(sdata, addr);
1612 if (!sta) {
1613 tdls_dbg(sdata,
1614 "Invalid TDLS peer %pM for channel switch cancel\n",
1615 addr);
1616 goto out;
1617 }
1618
1619 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1620 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1621 addr);
1622 goto out;
1623 }
1624
1625 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1626 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1627
1628 out:
1629 mutex_unlock(&local->sta_mtx);
1630 }
1631
1632 static struct sk_buff *
1633 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1634 u32 *ch_sw_tm_ie_offset)
1635 {
1636 struct ieee80211_sub_if_data *sdata = sta->sdata;
1637 struct sk_buff *skb;
1638 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1639
1640 /* initial timing are always zero in the template */
1641 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1642
1643 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1644 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1645 0, 0, !sta->sta.tdls_initiator,
1646 extra_ies, sizeof(extra_ies), 0, NULL);
1647 if (!skb)
1648 return NULL;
1649
1650 skb = ieee80211_build_data_template(sdata, skb, 0);
1651 if (IS_ERR(skb)) {
1652 tdls_dbg(sdata,
1653 "Failed building TDLS channel switch resp frame\n");
1654 return NULL;
1655 }
1656
1657 if (ch_sw_tm_ie_offset) {
1658 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1659
1660 if (!tm_ie) {
1661 tdls_dbg(sdata,
1662 "No switch timing IE in TDLS switch resp\n");
1663 dev_kfree_skb_any(skb);
1664 return NULL;
1665 }
1666
1667 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1668 }
1669
1670 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1671 sta->sta.addr);
1672 return skb;
1673 }
1674
1675 static int
1676 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1677 struct sk_buff *skb)
1678 {
1679 struct ieee80211_local *local = sdata->local;
1680 struct ieee802_11_elems elems;
1681 struct sta_info *sta;
1682 struct ieee80211_tdls_data *tf = (void *)skb->data;
1683 bool local_initiator;
1684 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1685 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1686 struct ieee80211_tdls_ch_sw_params params = {};
1687 int ret;
1688
1689 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1690 params.timestamp = rx_status->device_timestamp;
1691
1692 if (skb->len < baselen) {
1693 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1694 skb->len);
1695 return -EINVAL;
1696 }
1697
1698 mutex_lock(&local->sta_mtx);
1699 sta = sta_info_get(sdata, tf->sa);
1700 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1701 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1702 tf->sa);
1703 ret = -EINVAL;
1704 goto out;
1705 }
1706
1707 params.sta = &sta->sta;
1708 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1709 if (params.status != 0) {
1710 ret = 0;
1711 goto call_drv;
1712 }
1713
1714 ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1715 skb->len - baselen, false, &elems);
1716 if (elems.parse_error) {
1717 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1718 ret = -EINVAL;
1719 goto out;
1720 }
1721
1722 if (!elems.ch_sw_timing || !elems.lnk_id) {
1723 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1724 ret = -EINVAL;
1725 goto out;
1726 }
1727
1728 /* validate the initiator is set correctly */
1729 local_initiator =
1730 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1731 if (local_initiator == sta->sta.tdls_initiator) {
1732 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1733 ret = -EINVAL;
1734 goto out;
1735 }
1736
1737 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1738 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1739
1740 params.tmpl_skb =
1741 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1742 if (!params.tmpl_skb) {
1743 ret = -ENOENT;
1744 goto out;
1745 }
1746
1747 ret = 0;
1748 call_drv:
1749 drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1750
1751 tdls_dbg(sdata,
1752 "TDLS channel switch response received from %pM status %d\n",
1753 tf->sa, params.status);
1754
1755 out:
1756 mutex_unlock(&local->sta_mtx);
1757 dev_kfree_skb_any(params.tmpl_skb);
1758 return ret;
1759 }
1760
1761 static int
1762 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1763 struct sk_buff *skb)
1764 {
1765 struct ieee80211_local *local = sdata->local;
1766 struct ieee802_11_elems elems;
1767 struct cfg80211_chan_def chandef;
1768 struct ieee80211_channel *chan;
1769 enum nl80211_channel_type chan_type;
1770 int freq;
1771 u8 target_channel, oper_class;
1772 bool local_initiator;
1773 struct sta_info *sta;
1774 enum nl80211_band band;
1775 struct ieee80211_tdls_data *tf = (void *)skb->data;
1776 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1777 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1778 struct ieee80211_tdls_ch_sw_params params = {};
1779 int ret = 0;
1780
1781 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1782 params.timestamp = rx_status->device_timestamp;
1783
1784 if (skb->len < baselen) {
1785 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1786 skb->len);
1787 return -EINVAL;
1788 }
1789
1790 target_channel = tf->u.chan_switch_req.target_channel;
1791 oper_class = tf->u.chan_switch_req.oper_class;
1792
1793 /*
1794 * We can't easily infer the channel band. The operating class is
1795 * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1796 * solution here is to treat channels with number >14 as 5GHz ones,
1797 * and specifically check for the (oper_class, channel) combinations
1798 * where this doesn't hold. These are thankfully unique according to
1799 * IEEE802.11-2012.
1800 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1801 * valid here.
1802 */
1803 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1804 oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1805 target_channel < 14)
1806 band = NL80211_BAND_5GHZ;
1807 else
1808 band = target_channel < 14 ? NL80211_BAND_2GHZ :
1809 NL80211_BAND_5GHZ;
1810
1811 freq = ieee80211_channel_to_frequency(target_channel, band);
1812 if (freq == 0) {
1813 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1814 target_channel);
1815 return -EINVAL;
1816 }
1817
1818 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1819 if (!chan) {
1820 tdls_dbg(sdata,
1821 "Unsupported channel for TDLS chan switch: %d\n",
1822 target_channel);
1823 return -EINVAL;
1824 }
1825
1826 ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1827 skb->len - baselen, false, &elems);
1828 if (elems.parse_error) {
1829 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1830 return -EINVAL;
1831 }
1832
1833 if (!elems.ch_sw_timing || !elems.lnk_id) {
1834 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1835 return -EINVAL;
1836 }
1837
1838 if (!elems.sec_chan_offs) {
1839 chan_type = NL80211_CHAN_HT20;
1840 } else {
1841 switch (elems.sec_chan_offs->sec_chan_offs) {
1842 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1843 chan_type = NL80211_CHAN_HT40PLUS;
1844 break;
1845 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1846 chan_type = NL80211_CHAN_HT40MINUS;
1847 break;
1848 default:
1849 chan_type = NL80211_CHAN_HT20;
1850 break;
1851 }
1852 }
1853
1854 cfg80211_chandef_create(&chandef, chan, chan_type);
1855
1856 /* we will be active on the TDLS link */
1857 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1858 sdata->wdev.iftype)) {
1859 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1860 return -EINVAL;
1861 }
1862
1863 mutex_lock(&local->sta_mtx);
1864 sta = sta_info_get(sdata, tf->sa);
1865 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1866 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1867 tf->sa);
1868 ret = -EINVAL;
1869 goto out;
1870 }
1871
1872 params.sta = &sta->sta;
1873
1874 /* validate the initiator is set correctly */
1875 local_initiator =
1876 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1877 if (local_initiator == sta->sta.tdls_initiator) {
1878 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1879 ret = -EINVAL;
1880 goto out;
1881 }
1882
1883 /* peer should have known better */
1884 if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs &&
1885 elems.sec_chan_offs->sec_chan_offs) {
1886 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1887 ret = -ENOTSUPP;
1888 goto out;
1889 }
1890
1891 params.chandef = &chandef;
1892 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1893 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1894
1895 params.tmpl_skb =
1896 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1897 &params.ch_sw_tm_ie);
1898 if (!params.tmpl_skb) {
1899 ret = -ENOENT;
1900 goto out;
1901 }
1902
1903 drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1904
1905 tdls_dbg(sdata,
1906 "TDLS ch switch request received from %pM ch %d width %d\n",
1907 tf->sa, params.chandef->chan->center_freq,
1908 params.chandef->width);
1909 out:
1910 mutex_unlock(&local->sta_mtx);
1911 dev_kfree_skb_any(params.tmpl_skb);
1912 return ret;
1913 }
1914
1915 static void
1916 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1917 struct sk_buff *skb)
1918 {
1919 struct ieee80211_tdls_data *tf = (void *)skb->data;
1920 struct wiphy *wiphy = sdata->local->hw.wiphy;
1921
1922 ASSERT_RTNL();
1923
1924 /* make sure the driver supports it */
1925 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1926 return;
1927
1928 /* we want to access the entire packet */
1929 if (skb_linearize(skb))
1930 return;
1931 /*
1932 * The packet/size was already validated by mac80211 Rx path, only look
1933 * at the action type.
1934 */
1935 switch (tf->action_code) {
1936 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1937 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1938 break;
1939 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1940 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1941 break;
1942 default:
1943 WARN_ON_ONCE(1);
1944 return;
1945 }
1946 }
1947
1948 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1949 {
1950 struct sta_info *sta;
1951 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1952
1953 rcu_read_lock();
1954 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1955 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1956 !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1957 continue;
1958
1959 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1960 NL80211_TDLS_TEARDOWN, reason,
1961 GFP_ATOMIC);
1962 }
1963 rcu_read_unlock();
1964 }
1965
1966 void ieee80211_tdls_chsw_work(struct work_struct *wk)
1967 {
1968 struct ieee80211_local *local =
1969 container_of(wk, struct ieee80211_local, tdls_chsw_work);
1970 struct ieee80211_sub_if_data *sdata;
1971 struct sk_buff *skb;
1972 struct ieee80211_tdls_data *tf;
1973
1974 rtnl_lock();
1975 while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) {
1976 tf = (struct ieee80211_tdls_data *)skb->data;
1977 list_for_each_entry(sdata, &local->interfaces, list) {
1978 if (!ieee80211_sdata_running(sdata) ||
1979 sdata->vif.type != NL80211_IFTYPE_STATION ||
1980 !ether_addr_equal(tf->da, sdata->vif.addr))
1981 continue;
1982
1983 ieee80211_process_tdls_channel_switch(sdata, skb);
1984 break;
1985 }
1986
1987 kfree_skb(skb);
1988 }
1989 rtnl_unlock();
1990 }
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