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Merge tag 'armsoc-arm64' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[mirror_ubuntu-artful-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 = (void *)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 = (void *)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 = (void *)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 = (void *)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 = (void *)skb_put(skb, sizeof(*wmm));
275 memset(wmm, 0, sizeof(*wmm));
276
277 wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
278 wmm->len = sizeof(*wmm) - 2;
279
280 wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
281 wmm->oui[1] = 0x50;
282 wmm->oui[2] = 0xf2;
283 wmm->oui_type = 2; /* WME */
284 wmm->oui_subtype = 1; /* WME param */
285 wmm->version = 1; /* WME ver */
286 wmm->qos_info = 0; /* U-APSD not in use */
287
288 /*
289 * Use the EDCA parameters defined for the BSS, or default if the AP
290 * doesn't support it, as mandated by 802.11-2012 section 10.22.4
291 */
292 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
293 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
294 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
295 txq->acm, i);
296 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
297 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
298 }
299 }
300
301 static void
302 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
303 struct sta_info *sta)
304 {
305 /* IEEE802.11ac-2013 Table E-4 */
306 u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
307 struct cfg80211_chan_def uc = sta->tdls_chandef;
308 enum nl80211_chan_width max_width = ieee80211_sta_cap_chan_bw(sta);
309 int i;
310
311 /* only support upgrading non-narrow channels up to 80Mhz */
312 if (max_width == NL80211_CHAN_WIDTH_5 ||
313 max_width == NL80211_CHAN_WIDTH_10)
314 return;
315
316 if (max_width > NL80211_CHAN_WIDTH_80)
317 max_width = NL80211_CHAN_WIDTH_80;
318
319 if (uc.width >= max_width)
320 return;
321 /*
322 * Channel usage constrains in the IEEE802.11ac-2013 specification only
323 * allow expanding a 20MHz channel to 80MHz in a single way. In
324 * addition, there are no 40MHz allowed channels that are not part of
325 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
326 */
327 for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
328 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
329 uc.center_freq1 = centers_80mhz[i];
330 uc.center_freq2 = 0;
331 uc.width = NL80211_CHAN_WIDTH_80;
332 break;
333 }
334
335 if (!uc.center_freq1)
336 return;
337
338 /* proceed to downgrade the chandef until usable or the same as AP BW */
339 while (uc.width > max_width ||
340 (uc.width > sta->tdls_chandef.width &&
341 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
342 sdata->wdev.iftype)))
343 ieee80211_chandef_downgrade(&uc);
344
345 if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
346 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
347 sta->tdls_chandef.width, uc.width);
348
349 /*
350 * the station is not yet authorized when BW upgrade is done,
351 * locking is not required
352 */
353 sta->tdls_chandef = uc;
354 }
355 }
356
357 static void
358 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
359 struct sk_buff *skb, const u8 *peer,
360 u8 action_code, bool initiator,
361 const u8 *extra_ies, size_t extra_ies_len)
362 {
363 struct ieee80211_supported_band *sband;
364 struct ieee80211_local *local = sdata->local;
365 struct ieee80211_sta_ht_cap ht_cap;
366 struct ieee80211_sta_vht_cap vht_cap;
367 struct sta_info *sta = NULL;
368 size_t offset = 0, noffset;
369 u8 *pos;
370
371 sband = ieee80211_get_sband(sdata);
372 if (!sband)
373 return;
374
375 ieee80211_add_srates_ie(sdata, skb, false, sband->band);
376 ieee80211_add_ext_srates_ie(sdata, skb, false, sband->band);
377 ieee80211_tdls_add_supp_channels(sdata, skb);
378
379 /* add any custom IEs that go before Extended Capabilities */
380 if (extra_ies_len) {
381 static const u8 before_ext_cap[] = {
382 WLAN_EID_SUPP_RATES,
383 WLAN_EID_COUNTRY,
384 WLAN_EID_EXT_SUPP_RATES,
385 WLAN_EID_SUPPORTED_CHANNELS,
386 WLAN_EID_RSN,
387 };
388 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
389 before_ext_cap,
390 ARRAY_SIZE(before_ext_cap),
391 offset);
392 pos = skb_put(skb, noffset - offset);
393 memcpy(pos, extra_ies + offset, noffset - offset);
394 offset = noffset;
395 }
396
397 ieee80211_tdls_add_ext_capab(sdata, skb);
398
399 /* add the QoS element if we support it */
400 if (local->hw.queues >= IEEE80211_NUM_ACS &&
401 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
402 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
403
404 /* add any custom IEs that go before HT capabilities */
405 if (extra_ies_len) {
406 static const u8 before_ht_cap[] = {
407 WLAN_EID_SUPP_RATES,
408 WLAN_EID_COUNTRY,
409 WLAN_EID_EXT_SUPP_RATES,
410 WLAN_EID_SUPPORTED_CHANNELS,
411 WLAN_EID_RSN,
412 WLAN_EID_EXT_CAPABILITY,
413 WLAN_EID_QOS_CAPA,
414 WLAN_EID_FAST_BSS_TRANSITION,
415 WLAN_EID_TIMEOUT_INTERVAL,
416 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
417 };
418 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
419 before_ht_cap,
420 ARRAY_SIZE(before_ht_cap),
421 offset);
422 pos = skb_put(skb, noffset - offset);
423 memcpy(pos, extra_ies + offset, noffset - offset);
424 offset = noffset;
425 }
426
427 mutex_lock(&local->sta_mtx);
428
429 /* we should have the peer STA if we're already responding */
430 if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
431 sta = sta_info_get(sdata, peer);
432 if (WARN_ON_ONCE(!sta)) {
433 mutex_unlock(&local->sta_mtx);
434 return;
435 }
436
437 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
438 }
439
440 ieee80211_tdls_add_oper_classes(sdata, skb);
441
442 /*
443 * with TDLS we can switch channels, and HT-caps are not necessarily
444 * the same on all bands. The specification limits the setup to a
445 * single HT-cap, so use the current band for now.
446 */
447 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
448
449 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
450 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
451 ht_cap.ht_supported) {
452 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
453
454 /* disable SMPS in TDLS initiator */
455 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
456 << IEEE80211_HT_CAP_SM_PS_SHIFT;
457
458 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
459 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
460 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
461 ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
462 /* the peer caps are already intersected with our own */
463 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
464
465 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
466 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
467 }
468
469 if (ht_cap.ht_supported &&
470 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
471 ieee80211_tdls_add_bss_coex_ie(skb);
472
473 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
474
475 /* add any custom IEs that go before VHT capabilities */
476 if (extra_ies_len) {
477 static const u8 before_vht_cap[] = {
478 WLAN_EID_SUPP_RATES,
479 WLAN_EID_COUNTRY,
480 WLAN_EID_EXT_SUPP_RATES,
481 WLAN_EID_SUPPORTED_CHANNELS,
482 WLAN_EID_RSN,
483 WLAN_EID_EXT_CAPABILITY,
484 WLAN_EID_QOS_CAPA,
485 WLAN_EID_FAST_BSS_TRANSITION,
486 WLAN_EID_TIMEOUT_INTERVAL,
487 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
488 WLAN_EID_MULTI_BAND,
489 };
490 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
491 before_vht_cap,
492 ARRAY_SIZE(before_vht_cap),
493 offset);
494 pos = skb_put(skb, noffset - offset);
495 memcpy(pos, extra_ies + offset, noffset - offset);
496 offset = noffset;
497 }
498
499 /* build the VHT-cap similarly to the HT-cap */
500 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
501 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
502 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
503 vht_cap.vht_supported) {
504 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
505
506 /* the AID is present only when VHT is implemented */
507 if (action_code == WLAN_TDLS_SETUP_REQUEST)
508 ieee80211_tdls_add_aid(sdata, skb);
509
510 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
511 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
512 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
513 vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
514 /* the peer caps are already intersected with our own */
515 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
516
517 /* the AID is present only when VHT is implemented */
518 ieee80211_tdls_add_aid(sdata, skb);
519
520 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
521 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
522
523 /*
524 * if both peers support WIDER_BW, we can expand the chandef to
525 * a wider compatible one, up to 80MHz
526 */
527 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
528 ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
529 }
530
531 mutex_unlock(&local->sta_mtx);
532
533 /* add any remaining IEs */
534 if (extra_ies_len) {
535 noffset = extra_ies_len;
536 pos = skb_put(skb, noffset - offset);
537 memcpy(pos, extra_ies + offset, noffset - offset);
538 }
539
540 }
541
542 static void
543 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
544 struct sk_buff *skb, const u8 *peer,
545 bool initiator, const u8 *extra_ies,
546 size_t extra_ies_len)
547 {
548 struct ieee80211_local *local = sdata->local;
549 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
550 size_t offset = 0, noffset;
551 struct sta_info *sta, *ap_sta;
552 struct ieee80211_supported_band *sband;
553 u8 *pos;
554
555 sband = ieee80211_get_sband(sdata);
556 if (!sband)
557 return;
558
559 mutex_lock(&local->sta_mtx);
560
561 sta = sta_info_get(sdata, peer);
562 ap_sta = sta_info_get(sdata, ifmgd->bssid);
563 if (WARN_ON_ONCE(!sta || !ap_sta)) {
564 mutex_unlock(&local->sta_mtx);
565 return;
566 }
567
568 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
569
570 /* add any custom IEs that go before the QoS IE */
571 if (extra_ies_len) {
572 static const u8 before_qos[] = {
573 WLAN_EID_RSN,
574 };
575 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
576 before_qos,
577 ARRAY_SIZE(before_qos),
578 offset);
579 pos = skb_put(skb, noffset - offset);
580 memcpy(pos, extra_ies + offset, noffset - offset);
581 offset = noffset;
582 }
583
584 /* add the QoS param IE if both the peer and we support it */
585 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
586 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
587
588 /* add any custom IEs that go before HT operation */
589 if (extra_ies_len) {
590 static const u8 before_ht_op[] = {
591 WLAN_EID_RSN,
592 WLAN_EID_QOS_CAPA,
593 WLAN_EID_FAST_BSS_TRANSITION,
594 WLAN_EID_TIMEOUT_INTERVAL,
595 };
596 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
597 before_ht_op,
598 ARRAY_SIZE(before_ht_op),
599 offset);
600 pos = skb_put(skb, noffset - offset);
601 memcpy(pos, extra_ies + offset, noffset - offset);
602 offset = noffset;
603 }
604
605 /*
606 * if HT support is only added in TDLS, we need an HT-operation IE.
607 * add the IE as required by IEEE802.11-2012 9.23.3.2.
608 */
609 if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
610 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
611 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
612 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
613
614 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
615 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
616 &sdata->vif.bss_conf.chandef, prot,
617 true);
618 }
619
620 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
621
622 /* only include VHT-operation if not on the 2.4GHz band */
623 if (sband->band != NL80211_BAND_2GHZ &&
624 sta->sta.vht_cap.vht_supported) {
625 /*
626 * if both peers support WIDER_BW, we can expand the chandef to
627 * a wider compatible one, up to 80MHz
628 */
629 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
630 ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
631
632 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
633 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
634 &sta->tdls_chandef);
635 }
636
637 mutex_unlock(&local->sta_mtx);
638
639 /* add any remaining IEs */
640 if (extra_ies_len) {
641 noffset = extra_ies_len;
642 pos = skb_put(skb, noffset - offset);
643 memcpy(pos, extra_ies + offset, noffset - offset);
644 }
645 }
646
647 static void
648 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
649 struct sk_buff *skb, const u8 *peer,
650 bool initiator, const u8 *extra_ies,
651 size_t extra_ies_len, u8 oper_class,
652 struct cfg80211_chan_def *chandef)
653 {
654 struct ieee80211_tdls_data *tf;
655 size_t offset = 0, noffset;
656 u8 *pos;
657
658 if (WARN_ON_ONCE(!chandef))
659 return;
660
661 tf = (void *)skb->data;
662 tf->u.chan_switch_req.target_channel =
663 ieee80211_frequency_to_channel(chandef->chan->center_freq);
664 tf->u.chan_switch_req.oper_class = oper_class;
665
666 if (extra_ies_len) {
667 static const u8 before_lnkie[] = {
668 WLAN_EID_SECONDARY_CHANNEL_OFFSET,
669 };
670 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
671 before_lnkie,
672 ARRAY_SIZE(before_lnkie),
673 offset);
674 pos = skb_put(skb, noffset - offset);
675 memcpy(pos, extra_ies + offset, noffset - offset);
676 offset = noffset;
677 }
678
679 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
680
681 /* add any remaining IEs */
682 if (extra_ies_len) {
683 noffset = extra_ies_len;
684 pos = skb_put(skb, noffset - offset);
685 memcpy(pos, extra_ies + offset, noffset - offset);
686 }
687 }
688
689 static void
690 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
691 struct sk_buff *skb, const u8 *peer,
692 u16 status_code, bool initiator,
693 const u8 *extra_ies,
694 size_t extra_ies_len)
695 {
696 if (status_code == 0)
697 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
698
699 if (extra_ies_len)
700 memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
701 }
702
703 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
704 struct sk_buff *skb, const u8 *peer,
705 u8 action_code, u16 status_code,
706 bool initiator, const u8 *extra_ies,
707 size_t extra_ies_len, u8 oper_class,
708 struct cfg80211_chan_def *chandef)
709 {
710 switch (action_code) {
711 case WLAN_TDLS_SETUP_REQUEST:
712 case WLAN_TDLS_SETUP_RESPONSE:
713 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
714 if (status_code == 0)
715 ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
716 action_code,
717 initiator,
718 extra_ies,
719 extra_ies_len);
720 break;
721 case WLAN_TDLS_SETUP_CONFIRM:
722 if (status_code == 0)
723 ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
724 initiator, extra_ies,
725 extra_ies_len);
726 break;
727 case WLAN_TDLS_TEARDOWN:
728 case WLAN_TDLS_DISCOVERY_REQUEST:
729 if (extra_ies_len)
730 memcpy(skb_put(skb, extra_ies_len), extra_ies,
731 extra_ies_len);
732 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
733 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
734 break;
735 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
736 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
737 initiator, extra_ies,
738 extra_ies_len,
739 oper_class, chandef);
740 break;
741 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
742 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
743 status_code,
744 initiator, extra_ies,
745 extra_ies_len);
746 break;
747 }
748
749 }
750
751 static int
752 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
753 const u8 *peer, u8 action_code, u8 dialog_token,
754 u16 status_code, struct sk_buff *skb)
755 {
756 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
757 struct ieee80211_tdls_data *tf;
758
759 tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
760
761 memcpy(tf->da, peer, ETH_ALEN);
762 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
763 tf->ether_type = cpu_to_be16(ETH_P_TDLS);
764 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
765
766 /* network header is after the ethernet header */
767 skb_set_network_header(skb, ETH_HLEN);
768
769 switch (action_code) {
770 case WLAN_TDLS_SETUP_REQUEST:
771 tf->category = WLAN_CATEGORY_TDLS;
772 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
773
774 skb_put(skb, sizeof(tf->u.setup_req));
775 tf->u.setup_req.dialog_token = dialog_token;
776 tf->u.setup_req.capability =
777 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
778 status_code));
779 break;
780 case WLAN_TDLS_SETUP_RESPONSE:
781 tf->category = WLAN_CATEGORY_TDLS;
782 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
783
784 skb_put(skb, sizeof(tf->u.setup_resp));
785 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
786 tf->u.setup_resp.dialog_token = dialog_token;
787 tf->u.setup_resp.capability =
788 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
789 status_code));
790 break;
791 case WLAN_TDLS_SETUP_CONFIRM:
792 tf->category = WLAN_CATEGORY_TDLS;
793 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
794
795 skb_put(skb, sizeof(tf->u.setup_cfm));
796 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
797 tf->u.setup_cfm.dialog_token = dialog_token;
798 break;
799 case WLAN_TDLS_TEARDOWN:
800 tf->category = WLAN_CATEGORY_TDLS;
801 tf->action_code = WLAN_TDLS_TEARDOWN;
802
803 skb_put(skb, sizeof(tf->u.teardown));
804 tf->u.teardown.reason_code = cpu_to_le16(status_code);
805 break;
806 case WLAN_TDLS_DISCOVERY_REQUEST:
807 tf->category = WLAN_CATEGORY_TDLS;
808 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
809
810 skb_put(skb, sizeof(tf->u.discover_req));
811 tf->u.discover_req.dialog_token = dialog_token;
812 break;
813 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
814 tf->category = WLAN_CATEGORY_TDLS;
815 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
816
817 skb_put(skb, sizeof(tf->u.chan_switch_req));
818 break;
819 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
820 tf->category = WLAN_CATEGORY_TDLS;
821 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
822
823 skb_put(skb, sizeof(tf->u.chan_switch_resp));
824 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
825 break;
826 default:
827 return -EINVAL;
828 }
829
830 return 0;
831 }
832
833 static int
834 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
835 const u8 *peer, u8 action_code, u8 dialog_token,
836 u16 status_code, struct sk_buff *skb)
837 {
838 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
839 struct ieee80211_mgmt *mgmt;
840
841 mgmt = (void *)skb_put(skb, 24);
842 memset(mgmt, 0, 24);
843 memcpy(mgmt->da, peer, ETH_ALEN);
844 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
845 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
846
847 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
848 IEEE80211_STYPE_ACTION);
849
850 switch (action_code) {
851 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
852 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
853 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
854 mgmt->u.action.u.tdls_discover_resp.action_code =
855 WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
856 mgmt->u.action.u.tdls_discover_resp.dialog_token =
857 dialog_token;
858 mgmt->u.action.u.tdls_discover_resp.capability =
859 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
860 status_code));
861 break;
862 default:
863 return -EINVAL;
864 }
865
866 return 0;
867 }
868
869 static struct sk_buff *
870 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
871 const u8 *peer, u8 action_code,
872 u8 dialog_token, u16 status_code,
873 bool initiator, const u8 *extra_ies,
874 size_t extra_ies_len, u8 oper_class,
875 struct cfg80211_chan_def *chandef)
876 {
877 struct ieee80211_local *local = sdata->local;
878 struct sk_buff *skb;
879 int ret;
880
881 skb = netdev_alloc_skb(sdata->dev,
882 local->hw.extra_tx_headroom +
883 max(sizeof(struct ieee80211_mgmt),
884 sizeof(struct ieee80211_tdls_data)) +
885 50 + /* supported rates */
886 10 + /* ext capab */
887 26 + /* max(WMM-info, WMM-param) */
888 2 + max(sizeof(struct ieee80211_ht_cap),
889 sizeof(struct ieee80211_ht_operation)) +
890 2 + max(sizeof(struct ieee80211_vht_cap),
891 sizeof(struct ieee80211_vht_operation)) +
892 50 + /* supported channels */
893 3 + /* 40/20 BSS coex */
894 4 + /* AID */
895 4 + /* oper classes */
896 extra_ies_len +
897 sizeof(struct ieee80211_tdls_lnkie));
898 if (!skb)
899 return NULL;
900
901 skb_reserve(skb, local->hw.extra_tx_headroom);
902
903 switch (action_code) {
904 case WLAN_TDLS_SETUP_REQUEST:
905 case WLAN_TDLS_SETUP_RESPONSE:
906 case WLAN_TDLS_SETUP_CONFIRM:
907 case WLAN_TDLS_TEARDOWN:
908 case WLAN_TDLS_DISCOVERY_REQUEST:
909 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
910 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
911 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
912 sdata->dev, peer,
913 action_code, dialog_token,
914 status_code, skb);
915 break;
916 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
917 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
918 peer, action_code,
919 dialog_token, status_code,
920 skb);
921 break;
922 default:
923 ret = -ENOTSUPP;
924 break;
925 }
926
927 if (ret < 0)
928 goto fail;
929
930 ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
931 initiator, extra_ies, extra_ies_len, oper_class,
932 chandef);
933 return skb;
934
935 fail:
936 dev_kfree_skb(skb);
937 return NULL;
938 }
939
940 static int
941 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
942 const u8 *peer, u8 action_code, u8 dialog_token,
943 u16 status_code, u32 peer_capability,
944 bool initiator, const u8 *extra_ies,
945 size_t extra_ies_len, u8 oper_class,
946 struct cfg80211_chan_def *chandef)
947 {
948 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
949 struct sk_buff *skb = NULL;
950 struct sta_info *sta;
951 u32 flags = 0;
952 int ret = 0;
953
954 rcu_read_lock();
955 sta = sta_info_get(sdata, peer);
956
957 /* infer the initiator if we can, to support old userspace */
958 switch (action_code) {
959 case WLAN_TDLS_SETUP_REQUEST:
960 if (sta) {
961 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
962 sta->sta.tdls_initiator = false;
963 }
964 /* fall-through */
965 case WLAN_TDLS_SETUP_CONFIRM:
966 case WLAN_TDLS_DISCOVERY_REQUEST:
967 initiator = true;
968 break;
969 case WLAN_TDLS_SETUP_RESPONSE:
970 /*
971 * In some testing scenarios, we send a request and response.
972 * Make the last packet sent take effect for the initiator
973 * value.
974 */
975 if (sta) {
976 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
977 sta->sta.tdls_initiator = true;
978 }
979 /* fall-through */
980 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
981 initiator = false;
982 break;
983 case WLAN_TDLS_TEARDOWN:
984 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
985 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
986 /* any value is ok */
987 break;
988 default:
989 ret = -ENOTSUPP;
990 break;
991 }
992
993 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
994 initiator = true;
995
996 rcu_read_unlock();
997 if (ret < 0)
998 goto fail;
999
1000 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
1001 dialog_token, status_code,
1002 initiator, extra_ies,
1003 extra_ies_len, oper_class,
1004 chandef);
1005 if (!skb) {
1006 ret = -EINVAL;
1007 goto fail;
1008 }
1009
1010 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
1011 ieee80211_tx_skb(sdata, skb);
1012 return 0;
1013 }
1014
1015 /*
1016 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1017 * we should default to AC_VI.
1018 */
1019 switch (action_code) {
1020 case WLAN_TDLS_SETUP_REQUEST:
1021 case WLAN_TDLS_SETUP_RESPONSE:
1022 skb_set_queue_mapping(skb, IEEE80211_AC_BK);
1023 skb->priority = 2;
1024 break;
1025 default:
1026 skb_set_queue_mapping(skb, IEEE80211_AC_VI);
1027 skb->priority = 5;
1028 break;
1029 }
1030
1031 /*
1032 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1033 * Later, if no ACK is returned from peer, we will re-send the teardown
1034 * packet through the AP.
1035 */
1036 if ((action_code == WLAN_TDLS_TEARDOWN) &&
1037 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1038 bool try_resend; /* Should we keep skb for possible resend */
1039
1040 /* If not sending directly to peer - no point in keeping skb */
1041 rcu_read_lock();
1042 sta = sta_info_get(sdata, peer);
1043 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1044 rcu_read_unlock();
1045
1046 spin_lock_bh(&sdata->u.mgd.teardown_lock);
1047 if (try_resend && !sdata->u.mgd.teardown_skb) {
1048 /* Mark it as requiring TX status callback */
1049 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1050 IEEE80211_TX_INTFL_MLME_CONN_TX;
1051
1052 /*
1053 * skb is copied since mac80211 will later set
1054 * properties that might not be the same as the AP,
1055 * such as encryption, QoS, addresses, etc.
1056 *
1057 * No problem if skb_copy() fails, so no need to check.
1058 */
1059 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1060 sdata->u.mgd.orig_teardown_skb = skb;
1061 }
1062 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1063 }
1064
1065 /* disable bottom halves when entering the Tx path */
1066 local_bh_disable();
1067 __ieee80211_subif_start_xmit(skb, dev, flags);
1068 local_bh_enable();
1069
1070 return ret;
1071
1072 fail:
1073 dev_kfree_skb(skb);
1074 return ret;
1075 }
1076
1077 static int
1078 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1079 const u8 *peer, u8 action_code, u8 dialog_token,
1080 u16 status_code, u32 peer_capability, bool initiator,
1081 const u8 *extra_ies, size_t extra_ies_len)
1082 {
1083 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1084 struct ieee80211_local *local = sdata->local;
1085 enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode;
1086 int ret;
1087
1088 /* don't support setup with forced SMPS mode that's not off */
1089 if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1090 smps_mode != IEEE80211_SMPS_OFF) {
1091 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1092 smps_mode);
1093 return -ENOTSUPP;
1094 }
1095
1096 mutex_lock(&local->mtx);
1097
1098 /* we don't support concurrent TDLS peer setups */
1099 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1100 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1101 ret = -EBUSY;
1102 goto out_unlock;
1103 }
1104
1105 /*
1106 * make sure we have a STA representing the peer so we drop or buffer
1107 * non-TDLS-setup frames to the peer. We can't send other packets
1108 * during setup through the AP path.
1109 * Allow error packets to be sent - sometimes we don't even add a STA
1110 * before failing the setup.
1111 */
1112 if (status_code == 0) {
1113 rcu_read_lock();
1114 if (!sta_info_get(sdata, peer)) {
1115 rcu_read_unlock();
1116 ret = -ENOLINK;
1117 goto out_unlock;
1118 }
1119 rcu_read_unlock();
1120 }
1121
1122 ieee80211_flush_queues(local, sdata, false);
1123 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1124 mutex_unlock(&local->mtx);
1125
1126 /* we cannot take the mutex while preparing the setup packet */
1127 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1128 dialog_token, status_code,
1129 peer_capability, initiator,
1130 extra_ies, extra_ies_len, 0,
1131 NULL);
1132 if (ret < 0) {
1133 mutex_lock(&local->mtx);
1134 eth_zero_addr(sdata->u.mgd.tdls_peer);
1135 mutex_unlock(&local->mtx);
1136 return ret;
1137 }
1138
1139 ieee80211_queue_delayed_work(&sdata->local->hw,
1140 &sdata->u.mgd.tdls_peer_del_work,
1141 TDLS_PEER_SETUP_TIMEOUT);
1142 return 0;
1143
1144 out_unlock:
1145 mutex_unlock(&local->mtx);
1146 return ret;
1147 }
1148
1149 static int
1150 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1151 const u8 *peer, u8 action_code, u8 dialog_token,
1152 u16 status_code, u32 peer_capability,
1153 bool initiator, const u8 *extra_ies,
1154 size_t extra_ies_len)
1155 {
1156 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1157 struct ieee80211_local *local = sdata->local;
1158 struct sta_info *sta;
1159 int ret;
1160
1161 /*
1162 * No packets can be transmitted to the peer via the AP during setup -
1163 * the STA is set as a TDLS peer, but is not authorized.
1164 * During teardown, we prevent direct transmissions by stopping the
1165 * queues and flushing all direct packets.
1166 */
1167 ieee80211_stop_vif_queues(local, sdata,
1168 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1169 ieee80211_flush_queues(local, sdata, false);
1170
1171 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1172 dialog_token, status_code,
1173 peer_capability, initiator,
1174 extra_ies, extra_ies_len, 0,
1175 NULL);
1176 if (ret < 0)
1177 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1178 ret);
1179
1180 /*
1181 * Remove the STA AUTH flag to force further traffic through the AP. If
1182 * the STA was unreachable, it was already removed.
1183 */
1184 rcu_read_lock();
1185 sta = sta_info_get(sdata, peer);
1186 if (sta)
1187 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1188 rcu_read_unlock();
1189
1190 ieee80211_wake_vif_queues(local, sdata,
1191 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1192
1193 return 0;
1194 }
1195
1196 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1197 const u8 *peer, u8 action_code, u8 dialog_token,
1198 u16 status_code, u32 peer_capability,
1199 bool initiator, const u8 *extra_ies,
1200 size_t extra_ies_len)
1201 {
1202 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1203 int ret;
1204
1205 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1206 return -ENOTSUPP;
1207
1208 /* make sure we are in managed mode, and associated */
1209 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1210 !sdata->u.mgd.associated)
1211 return -EINVAL;
1212
1213 switch (action_code) {
1214 case WLAN_TDLS_SETUP_REQUEST:
1215 case WLAN_TDLS_SETUP_RESPONSE:
1216 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1217 dialog_token, status_code,
1218 peer_capability, initiator,
1219 extra_ies, extra_ies_len);
1220 break;
1221 case WLAN_TDLS_TEARDOWN:
1222 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1223 action_code, dialog_token,
1224 status_code,
1225 peer_capability, initiator,
1226 extra_ies, extra_ies_len);
1227 break;
1228 case WLAN_TDLS_DISCOVERY_REQUEST:
1229 /*
1230 * Protect the discovery so we can hear the TDLS discovery
1231 * response frame. It is transmitted directly and not buffered
1232 * by the AP.
1233 */
1234 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1235 /* fall-through */
1236 case WLAN_TDLS_SETUP_CONFIRM:
1237 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1238 /* no special handling */
1239 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1240 action_code,
1241 dialog_token,
1242 status_code,
1243 peer_capability,
1244 initiator, extra_ies,
1245 extra_ies_len, 0, NULL);
1246 break;
1247 default:
1248 ret = -EOPNOTSUPP;
1249 break;
1250 }
1251
1252 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1253 action_code, peer, ret);
1254 return ret;
1255 }
1256
1257 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1258 struct sta_info *sta)
1259 {
1260 struct ieee80211_local *local = sdata->local;
1261 struct ieee80211_chanctx_conf *conf;
1262 struct ieee80211_chanctx *ctx;
1263 enum nl80211_chan_width width;
1264 struct ieee80211_supported_band *sband;
1265
1266 mutex_lock(&local->chanctx_mtx);
1267 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1268 lockdep_is_held(&local->chanctx_mtx));
1269 if (conf) {
1270 width = conf->def.width;
1271 sband = local->hw.wiphy->bands[conf->def.chan->band];
1272 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1273 ieee80211_recalc_chanctx_chantype(local, ctx);
1274
1275 /* if width changed and a peer is given, update its BW */
1276 if (width != conf->def.width && sta &&
1277 test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1278 enum ieee80211_sta_rx_bandwidth bw;
1279
1280 bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1281 bw = min(bw, ieee80211_sta_cap_rx_bw(sta));
1282 if (bw != sta->sta.bandwidth) {
1283 sta->sta.bandwidth = bw;
1284 rate_control_rate_update(local, sband, sta,
1285 IEEE80211_RC_BW_CHANGED);
1286 /*
1287 * if a TDLS peer BW was updated, we need to
1288 * recalc the chandef width again, to get the
1289 * correct chanctx min_def
1290 */
1291 ieee80211_recalc_chanctx_chantype(local, ctx);
1292 }
1293 }
1294
1295 }
1296 mutex_unlock(&local->chanctx_mtx);
1297 }
1298
1299 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1300 {
1301 struct sta_info *sta;
1302 bool result = false;
1303
1304 rcu_read_lock();
1305 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1306 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1307 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1308 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1309 !sta->sta.ht_cap.ht_supported)
1310 continue;
1311 result = true;
1312 break;
1313 }
1314 rcu_read_unlock();
1315
1316 return result;
1317 }
1318
1319 static void
1320 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1321 struct sta_info *sta)
1322 {
1323 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1324 bool tdls_ht;
1325 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1326 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1327 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1328 u16 opmode;
1329
1330 /* Nothing to do if the BSS connection uses HT */
1331 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
1332 return;
1333
1334 tdls_ht = (sta && sta->sta.ht_cap.ht_supported) ||
1335 iee80211_tdls_have_ht_peers(sdata);
1336
1337 opmode = sdata->vif.bss_conf.ht_operation_mode;
1338
1339 if (tdls_ht)
1340 opmode |= protection;
1341 else
1342 opmode &= ~protection;
1343
1344 if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1345 return;
1346
1347 sdata->vif.bss_conf.ht_operation_mode = opmode;
1348 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT);
1349 }
1350
1351 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1352 const u8 *peer, enum nl80211_tdls_operation oper)
1353 {
1354 struct sta_info *sta;
1355 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1356 struct ieee80211_local *local = sdata->local;
1357 int ret;
1358
1359 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1360 return -ENOTSUPP;
1361
1362 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1363 return -EINVAL;
1364
1365 switch (oper) {
1366 case NL80211_TDLS_ENABLE_LINK:
1367 case NL80211_TDLS_DISABLE_LINK:
1368 break;
1369 case NL80211_TDLS_TEARDOWN:
1370 case NL80211_TDLS_SETUP:
1371 case NL80211_TDLS_DISCOVERY_REQ:
1372 /* We don't support in-driver setup/teardown/discovery */
1373 return -ENOTSUPP;
1374 }
1375
1376 /* protect possible bss_conf changes and avoid concurrency in
1377 * ieee80211_bss_info_change_notify()
1378 */
1379 sdata_lock(sdata);
1380 mutex_lock(&local->mtx);
1381 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1382
1383 switch (oper) {
1384 case NL80211_TDLS_ENABLE_LINK:
1385 if (sdata->vif.csa_active) {
1386 tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1387 ret = -EBUSY;
1388 break;
1389 }
1390
1391 mutex_lock(&local->sta_mtx);
1392 sta = sta_info_get(sdata, peer);
1393 if (!sta) {
1394 mutex_unlock(&local->sta_mtx);
1395 ret = -ENOLINK;
1396 break;
1397 }
1398
1399 iee80211_tdls_recalc_chanctx(sdata, sta);
1400 iee80211_tdls_recalc_ht_protection(sdata, sta);
1401
1402 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1403 mutex_unlock(&local->sta_mtx);
1404
1405 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1406 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1407 ret = 0;
1408 break;
1409 case NL80211_TDLS_DISABLE_LINK:
1410 /*
1411 * The teardown message in ieee80211_tdls_mgmt_teardown() was
1412 * created while the queues were stopped, so it might still be
1413 * pending. Before flushing the queues we need to be sure the
1414 * message is handled by the tasklet handling pending messages,
1415 * otherwise we might start destroying the station before
1416 * sending the teardown packet.
1417 * Note that this only forces the tasklet to flush pendings -
1418 * not to stop the tasklet from rescheduling itself.
1419 */
1420 tasklet_kill(&local->tx_pending_tasklet);
1421 /* flush a potentially queued teardown packet */
1422 ieee80211_flush_queues(local, sdata, false);
1423
1424 ret = sta_info_destroy_addr(sdata, peer);
1425
1426 mutex_lock(&local->sta_mtx);
1427 iee80211_tdls_recalc_ht_protection(sdata, NULL);
1428 mutex_unlock(&local->sta_mtx);
1429
1430 iee80211_tdls_recalc_chanctx(sdata, NULL);
1431 break;
1432 default:
1433 ret = -ENOTSUPP;
1434 break;
1435 }
1436
1437 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1438 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1439 eth_zero_addr(sdata->u.mgd.tdls_peer);
1440 }
1441
1442 if (ret == 0)
1443 ieee80211_queue_work(&sdata->local->hw,
1444 &sdata->u.mgd.request_smps_work);
1445
1446 mutex_unlock(&local->mtx);
1447 sdata_unlock(sdata);
1448 return ret;
1449 }
1450
1451 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1452 enum nl80211_tdls_operation oper,
1453 u16 reason_code, gfp_t gfp)
1454 {
1455 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1456
1457 if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1458 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1459 oper);
1460 return;
1461 }
1462
1463 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1464 }
1465 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1466
1467 static void
1468 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1469 {
1470 struct ieee80211_ch_switch_timing *ch_sw;
1471
1472 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1473 *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1474
1475 ch_sw = (void *)buf;
1476 ch_sw->switch_time = cpu_to_le16(switch_time);
1477 ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1478 }
1479
1480 /* find switch timing IE in SKB ready for Tx */
1481 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1482 {
1483 struct ieee80211_tdls_data *tf;
1484 const u8 *ie_start;
1485
1486 /*
1487 * Get the offset for the new location of the switch timing IE.
1488 * The SKB network header will now point to the "payload_type"
1489 * element of the TDLS data frame struct.
1490 */
1491 tf = container_of(skb->data + skb_network_offset(skb),
1492 struct ieee80211_tdls_data, payload_type);
1493 ie_start = tf->u.chan_switch_req.variable;
1494 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1495 skb->len - (ie_start - skb->data));
1496 }
1497
1498 static struct sk_buff *
1499 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1500 struct cfg80211_chan_def *chandef,
1501 u32 *ch_sw_tm_ie_offset)
1502 {
1503 struct ieee80211_sub_if_data *sdata = sta->sdata;
1504 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1505 2 + sizeof(struct ieee80211_ch_switch_timing)];
1506 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1507 u8 *pos = extra_ies;
1508 struct sk_buff *skb;
1509
1510 /*
1511 * if chandef points to a wide channel add a Secondary-Channel
1512 * Offset information element
1513 */
1514 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1515 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1516 bool ht40plus;
1517
1518 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1519 *pos++ = sizeof(*sec_chan_ie);
1520 sec_chan_ie = (void *)pos;
1521
1522 ht40plus = cfg80211_get_chandef_type(chandef) ==
1523 NL80211_CHAN_HT40PLUS;
1524 sec_chan_ie->sec_chan_offs = ht40plus ?
1525 IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1526 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1527 pos += sizeof(*sec_chan_ie);
1528
1529 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1530 }
1531
1532 /* just set the values to 0, this is a template */
1533 iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1534
1535 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1536 WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1537 0, 0, !sta->sta.tdls_initiator,
1538 extra_ies, extra_ies_len,
1539 oper_class, chandef);
1540 if (!skb)
1541 return NULL;
1542
1543 skb = ieee80211_build_data_template(sdata, skb, 0);
1544 if (IS_ERR(skb)) {
1545 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1546 return NULL;
1547 }
1548
1549 if (ch_sw_tm_ie_offset) {
1550 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1551
1552 if (!tm_ie) {
1553 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1554 dev_kfree_skb_any(skb);
1555 return NULL;
1556 }
1557
1558 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1559 }
1560
1561 tdls_dbg(sdata,
1562 "TDLS channel switch request template for %pM ch %d width %d\n",
1563 sta->sta.addr, chandef->chan->center_freq, chandef->width);
1564 return skb;
1565 }
1566
1567 int
1568 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1569 const u8 *addr, u8 oper_class,
1570 struct cfg80211_chan_def *chandef)
1571 {
1572 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1573 struct ieee80211_local *local = sdata->local;
1574 struct sta_info *sta;
1575 struct sk_buff *skb = NULL;
1576 u32 ch_sw_tm_ie;
1577 int ret;
1578
1579 mutex_lock(&local->sta_mtx);
1580 sta = sta_info_get(sdata, addr);
1581 if (!sta) {
1582 tdls_dbg(sdata,
1583 "Invalid TDLS peer %pM for channel switch request\n",
1584 addr);
1585 ret = -ENOENT;
1586 goto out;
1587 }
1588
1589 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1590 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1591 addr);
1592 ret = -ENOTSUPP;
1593 goto out;
1594 }
1595
1596 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1597 &ch_sw_tm_ie);
1598 if (!skb) {
1599 ret = -ENOENT;
1600 goto out;
1601 }
1602
1603 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1604 chandef, skb, ch_sw_tm_ie);
1605 if (!ret)
1606 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1607
1608 out:
1609 mutex_unlock(&local->sta_mtx);
1610 dev_kfree_skb_any(skb);
1611 return ret;
1612 }
1613
1614 void
1615 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1616 struct net_device *dev,
1617 const u8 *addr)
1618 {
1619 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1620 struct ieee80211_local *local = sdata->local;
1621 struct sta_info *sta;
1622
1623 mutex_lock(&local->sta_mtx);
1624 sta = sta_info_get(sdata, addr);
1625 if (!sta) {
1626 tdls_dbg(sdata,
1627 "Invalid TDLS peer %pM for channel switch cancel\n",
1628 addr);
1629 goto out;
1630 }
1631
1632 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1633 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1634 addr);
1635 goto out;
1636 }
1637
1638 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1639 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1640
1641 out:
1642 mutex_unlock(&local->sta_mtx);
1643 }
1644
1645 static struct sk_buff *
1646 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1647 u32 *ch_sw_tm_ie_offset)
1648 {
1649 struct ieee80211_sub_if_data *sdata = sta->sdata;
1650 struct sk_buff *skb;
1651 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1652
1653 /* initial timing are always zero in the template */
1654 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1655
1656 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1657 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1658 0, 0, !sta->sta.tdls_initiator,
1659 extra_ies, sizeof(extra_ies), 0, NULL);
1660 if (!skb)
1661 return NULL;
1662
1663 skb = ieee80211_build_data_template(sdata, skb, 0);
1664 if (IS_ERR(skb)) {
1665 tdls_dbg(sdata,
1666 "Failed building TDLS channel switch resp frame\n");
1667 return NULL;
1668 }
1669
1670 if (ch_sw_tm_ie_offset) {
1671 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1672
1673 if (!tm_ie) {
1674 tdls_dbg(sdata,
1675 "No switch timing IE in TDLS switch resp\n");
1676 dev_kfree_skb_any(skb);
1677 return NULL;
1678 }
1679
1680 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1681 }
1682
1683 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1684 sta->sta.addr);
1685 return skb;
1686 }
1687
1688 static int
1689 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1690 struct sk_buff *skb)
1691 {
1692 struct ieee80211_local *local = sdata->local;
1693 struct ieee802_11_elems elems;
1694 struct sta_info *sta;
1695 struct ieee80211_tdls_data *tf = (void *)skb->data;
1696 bool local_initiator;
1697 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1698 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1699 struct ieee80211_tdls_ch_sw_params params = {};
1700 int ret;
1701
1702 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1703 params.timestamp = rx_status->device_timestamp;
1704
1705 if (skb->len < baselen) {
1706 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1707 skb->len);
1708 return -EINVAL;
1709 }
1710
1711 mutex_lock(&local->sta_mtx);
1712 sta = sta_info_get(sdata, tf->sa);
1713 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1714 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1715 tf->sa);
1716 ret = -EINVAL;
1717 goto out;
1718 }
1719
1720 params.sta = &sta->sta;
1721 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1722 if (params.status != 0) {
1723 ret = 0;
1724 goto call_drv;
1725 }
1726
1727 ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1728 skb->len - baselen, false, &elems);
1729 if (elems.parse_error) {
1730 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1731 ret = -EINVAL;
1732 goto out;
1733 }
1734
1735 if (!elems.ch_sw_timing || !elems.lnk_id) {
1736 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1737 ret = -EINVAL;
1738 goto out;
1739 }
1740
1741 /* validate the initiator is set correctly */
1742 local_initiator =
1743 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1744 if (local_initiator == sta->sta.tdls_initiator) {
1745 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1746 ret = -EINVAL;
1747 goto out;
1748 }
1749
1750 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1751 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1752
1753 params.tmpl_skb =
1754 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1755 if (!params.tmpl_skb) {
1756 ret = -ENOENT;
1757 goto out;
1758 }
1759
1760 ret = 0;
1761 call_drv:
1762 drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1763
1764 tdls_dbg(sdata,
1765 "TDLS channel switch response received from %pM status %d\n",
1766 tf->sa, params.status);
1767
1768 out:
1769 mutex_unlock(&local->sta_mtx);
1770 dev_kfree_skb_any(params.tmpl_skb);
1771 return ret;
1772 }
1773
1774 static int
1775 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1776 struct sk_buff *skb)
1777 {
1778 struct ieee80211_local *local = sdata->local;
1779 struct ieee802_11_elems elems;
1780 struct cfg80211_chan_def chandef;
1781 struct ieee80211_channel *chan;
1782 enum nl80211_channel_type chan_type;
1783 int freq;
1784 u8 target_channel, oper_class;
1785 bool local_initiator;
1786 struct sta_info *sta;
1787 enum nl80211_band band;
1788 struct ieee80211_tdls_data *tf = (void *)skb->data;
1789 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1790 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1791 struct ieee80211_tdls_ch_sw_params params = {};
1792 int ret = 0;
1793
1794 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1795 params.timestamp = rx_status->device_timestamp;
1796
1797 if (skb->len < baselen) {
1798 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1799 skb->len);
1800 return -EINVAL;
1801 }
1802
1803 target_channel = tf->u.chan_switch_req.target_channel;
1804 oper_class = tf->u.chan_switch_req.oper_class;
1805
1806 /*
1807 * We can't easily infer the channel band. The operating class is
1808 * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1809 * solution here is to treat channels with number >14 as 5GHz ones,
1810 * and specifically check for the (oper_class, channel) combinations
1811 * where this doesn't hold. These are thankfully unique according to
1812 * IEEE802.11-2012.
1813 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1814 * valid here.
1815 */
1816 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1817 oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1818 target_channel < 14)
1819 band = NL80211_BAND_5GHZ;
1820 else
1821 band = target_channel < 14 ? NL80211_BAND_2GHZ :
1822 NL80211_BAND_5GHZ;
1823
1824 freq = ieee80211_channel_to_frequency(target_channel, band);
1825 if (freq == 0) {
1826 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1827 target_channel);
1828 return -EINVAL;
1829 }
1830
1831 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1832 if (!chan) {
1833 tdls_dbg(sdata,
1834 "Unsupported channel for TDLS chan switch: %d\n",
1835 target_channel);
1836 return -EINVAL;
1837 }
1838
1839 ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1840 skb->len - baselen, false, &elems);
1841 if (elems.parse_error) {
1842 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1843 return -EINVAL;
1844 }
1845
1846 if (!elems.ch_sw_timing || !elems.lnk_id) {
1847 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1848 return -EINVAL;
1849 }
1850
1851 if (!elems.sec_chan_offs) {
1852 chan_type = NL80211_CHAN_HT20;
1853 } else {
1854 switch (elems.sec_chan_offs->sec_chan_offs) {
1855 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1856 chan_type = NL80211_CHAN_HT40PLUS;
1857 break;
1858 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1859 chan_type = NL80211_CHAN_HT40MINUS;
1860 break;
1861 default:
1862 chan_type = NL80211_CHAN_HT20;
1863 break;
1864 }
1865 }
1866
1867 cfg80211_chandef_create(&chandef, chan, chan_type);
1868
1869 /* we will be active on the TDLS link */
1870 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1871 sdata->wdev.iftype)) {
1872 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1873 return -EINVAL;
1874 }
1875
1876 mutex_lock(&local->sta_mtx);
1877 sta = sta_info_get(sdata, tf->sa);
1878 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1879 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1880 tf->sa);
1881 ret = -EINVAL;
1882 goto out;
1883 }
1884
1885 params.sta = &sta->sta;
1886
1887 /* validate the initiator is set correctly */
1888 local_initiator =
1889 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1890 if (local_initiator == sta->sta.tdls_initiator) {
1891 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1892 ret = -EINVAL;
1893 goto out;
1894 }
1895
1896 /* peer should have known better */
1897 if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs &&
1898 elems.sec_chan_offs->sec_chan_offs) {
1899 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1900 ret = -ENOTSUPP;
1901 goto out;
1902 }
1903
1904 params.chandef = &chandef;
1905 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1906 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1907
1908 params.tmpl_skb =
1909 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1910 &params.ch_sw_tm_ie);
1911 if (!params.tmpl_skb) {
1912 ret = -ENOENT;
1913 goto out;
1914 }
1915
1916 drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1917
1918 tdls_dbg(sdata,
1919 "TDLS ch switch request received from %pM ch %d width %d\n",
1920 tf->sa, params.chandef->chan->center_freq,
1921 params.chandef->width);
1922 out:
1923 mutex_unlock(&local->sta_mtx);
1924 dev_kfree_skb_any(params.tmpl_skb);
1925 return ret;
1926 }
1927
1928 static void
1929 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1930 struct sk_buff *skb)
1931 {
1932 struct ieee80211_tdls_data *tf = (void *)skb->data;
1933 struct wiphy *wiphy = sdata->local->hw.wiphy;
1934
1935 ASSERT_RTNL();
1936
1937 /* make sure the driver supports it */
1938 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1939 return;
1940
1941 /* we want to access the entire packet */
1942 if (skb_linearize(skb))
1943 return;
1944 /*
1945 * The packet/size was already validated by mac80211 Rx path, only look
1946 * at the action type.
1947 */
1948 switch (tf->action_code) {
1949 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1950 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1951 break;
1952 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1953 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1954 break;
1955 default:
1956 WARN_ON_ONCE(1);
1957 return;
1958 }
1959 }
1960
1961 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1962 {
1963 struct sta_info *sta;
1964 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1965
1966 rcu_read_lock();
1967 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1968 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1969 !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1970 continue;
1971
1972 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1973 NL80211_TDLS_TEARDOWN, reason,
1974 GFP_ATOMIC);
1975 }
1976 rcu_read_unlock();
1977 }
1978
1979 void ieee80211_tdls_chsw_work(struct work_struct *wk)
1980 {
1981 struct ieee80211_local *local =
1982 container_of(wk, struct ieee80211_local, tdls_chsw_work);
1983 struct ieee80211_sub_if_data *sdata;
1984 struct sk_buff *skb;
1985 struct ieee80211_tdls_data *tf;
1986
1987 rtnl_lock();
1988 while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) {
1989 tf = (struct ieee80211_tdls_data *)skb->data;
1990 list_for_each_entry(sdata, &local->interfaces, list) {
1991 if (!ieee80211_sdata_running(sdata) ||
1992 sdata->vif.type != NL80211_IFTYPE_STATION ||
1993 !ether_addr_equal(tf->da, sdata->vif.addr))
1994 continue;
1995
1996 ieee80211_process_tdls_channel_switch(sdata, skb);
1997 break;
1998 }
1999
2000 kfree_skb(skb);
2001 }
2002 rtnl_unlock();
2003 }
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