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Merge tag 'mac80211-next-for-davem-2015-10-05' of git://git.kernel.org/pub/scm/linux...
[mirror_ubuntu-zesty-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 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
19 /* give usermode some time for retries in setting up the TDLS session */
20 #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ)
21
22 void ieee80211_tdls_peer_del_work(struct work_struct *wk)
23 {
24 struct ieee80211_sub_if_data *sdata;
25 struct ieee80211_local *local;
26
27 sdata = container_of(wk, struct ieee80211_sub_if_data,
28 u.mgd.tdls_peer_del_work.work);
29 local = sdata->local;
30
31 mutex_lock(&local->mtx);
32 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
33 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
34 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
35 eth_zero_addr(sdata->u.mgd.tdls_peer);
36 }
37 mutex_unlock(&local->mtx);
38 }
39
40 static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata,
41 struct sk_buff *skb)
42 {
43 struct ieee80211_local *local = sdata->local;
44 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
45 bool chan_switch = local->hw.wiphy->features &
46 NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
47 bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
48 !ifmgd->tdls_wider_bw_prohibited;
49 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
50 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
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 /* The capability will be 0 when sending a failure code */
183 if (status_code != 0)
184 return 0;
185
186 if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_2GHZ) {
187 return WLAN_CAPABILITY_SHORT_SLOT_TIME |
188 WLAN_CAPABILITY_SHORT_PREAMBLE;
189 }
190
191 return 0;
192 }
193
194 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
195 struct sk_buff *skb, const u8 *peer,
196 bool initiator)
197 {
198 struct ieee80211_tdls_lnkie *lnkid;
199 const u8 *init_addr, *rsp_addr;
200
201 if (initiator) {
202 init_addr = sdata->vif.addr;
203 rsp_addr = peer;
204 } else {
205 init_addr = peer;
206 rsp_addr = sdata->vif.addr;
207 }
208
209 lnkid = (void *)skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
210
211 lnkid->ie_type = WLAN_EID_LINK_ID;
212 lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
213
214 memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
215 memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
216 memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
217 }
218
219 static void
220 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
221 {
222 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
223 u8 *pos = (void *)skb_put(skb, 4);
224
225 *pos++ = WLAN_EID_AID;
226 *pos++ = 2; /* len */
227 put_unaligned_le16(ifmgd->aid, pos);
228 }
229
230 /* translate numbering in the WMM parameter IE to the mac80211 notation */
231 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
232 {
233 switch (ac) {
234 default:
235 WARN_ON_ONCE(1);
236 case 0:
237 return IEEE80211_AC_BE;
238 case 1:
239 return IEEE80211_AC_BK;
240 case 2:
241 return IEEE80211_AC_VI;
242 case 3:
243 return IEEE80211_AC_VO;
244 }
245 }
246
247 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
248 {
249 u8 ret;
250
251 ret = aifsn & 0x0f;
252 if (acm)
253 ret |= 0x10;
254 ret |= (aci << 5) & 0x60;
255 return ret;
256 }
257
258 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
259 {
260 return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
261 ((ilog2(cw_max + 1) << 0x4) & 0xf0);
262 }
263
264 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
265 struct sk_buff *skb)
266 {
267 struct ieee80211_wmm_param_ie *wmm;
268 struct ieee80211_tx_queue_params *txq;
269 int i;
270
271 wmm = (void *)skb_put(skb, sizeof(*wmm));
272 memset(wmm, 0, sizeof(*wmm));
273
274 wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
275 wmm->len = sizeof(*wmm) - 2;
276
277 wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
278 wmm->oui[1] = 0x50;
279 wmm->oui[2] = 0xf2;
280 wmm->oui_type = 2; /* WME */
281 wmm->oui_subtype = 1; /* WME param */
282 wmm->version = 1; /* WME ver */
283 wmm->qos_info = 0; /* U-APSD not in use */
284
285 /*
286 * Use the EDCA parameters defined for the BSS, or default if the AP
287 * doesn't support it, as mandated by 802.11-2012 section 10.22.4
288 */
289 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
290 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
291 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
292 txq->acm, i);
293 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
294 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
295 }
296 }
297
298 static void
299 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
300 struct sta_info *sta)
301 {
302 /* IEEE802.11ac-2013 Table E-4 */
303 u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
304 struct cfg80211_chan_def uc = sta->tdls_chandef;
305 enum nl80211_chan_width max_width = ieee80211_get_sta_bw(&sta->sta);
306 int i;
307
308 /* only support upgrading non-narrow channels up to 80Mhz */
309 if (max_width == NL80211_CHAN_WIDTH_5 ||
310 max_width == NL80211_CHAN_WIDTH_10)
311 return;
312
313 if (max_width > NL80211_CHAN_WIDTH_80)
314 max_width = NL80211_CHAN_WIDTH_80;
315
316 if (uc.width == max_width)
317 return;
318 /*
319 * Channel usage constrains in the IEEE802.11ac-2013 specification only
320 * allow expanding a 20MHz channel to 80MHz in a single way. In
321 * addition, there are no 40MHz allowed channels that are not part of
322 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
323 */
324 for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
325 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
326 uc.center_freq1 = centers_80mhz[i];
327 uc.width = NL80211_CHAN_WIDTH_80;
328 break;
329 }
330
331 if (!uc.center_freq1)
332 return;
333
334 /* proceed to downgrade the chandef until usable or the same */
335 while (uc.width > max_width &&
336 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
337 sdata->wdev.iftype))
338 ieee80211_chandef_downgrade(&uc);
339
340 if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
341 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
342 sta->tdls_chandef.width, uc.width);
343
344 /*
345 * the station is not yet authorized when BW upgrade is done,
346 * locking is not required
347 */
348 sta->tdls_chandef = uc;
349 }
350 }
351
352 static void
353 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
354 struct sk_buff *skb, const u8 *peer,
355 u8 action_code, bool initiator,
356 const u8 *extra_ies, size_t extra_ies_len)
357 {
358 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
359 struct ieee80211_local *local = sdata->local;
360 struct ieee80211_supported_band *sband;
361 struct ieee80211_sta_ht_cap ht_cap;
362 struct ieee80211_sta_vht_cap vht_cap;
363 struct sta_info *sta = NULL;
364 size_t offset = 0, noffset;
365 u8 *pos;
366
367 ieee80211_add_srates_ie(sdata, skb, false, band);
368 ieee80211_add_ext_srates_ie(sdata, skb, false, band);
369 ieee80211_tdls_add_supp_channels(sdata, skb);
370
371 /* add any custom IEs that go before Extended Capabilities */
372 if (extra_ies_len) {
373 static const u8 before_ext_cap[] = {
374 WLAN_EID_SUPP_RATES,
375 WLAN_EID_COUNTRY,
376 WLAN_EID_EXT_SUPP_RATES,
377 WLAN_EID_SUPPORTED_CHANNELS,
378 WLAN_EID_RSN,
379 };
380 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
381 before_ext_cap,
382 ARRAY_SIZE(before_ext_cap),
383 offset);
384 pos = skb_put(skb, noffset - offset);
385 memcpy(pos, extra_ies + offset, noffset - offset);
386 offset = noffset;
387 }
388
389 ieee80211_tdls_add_ext_capab(sdata, skb);
390
391 /* add the QoS element if we support it */
392 if (local->hw.queues >= IEEE80211_NUM_ACS &&
393 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
394 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
395
396 /* add any custom IEs that go before HT capabilities */
397 if (extra_ies_len) {
398 static const u8 before_ht_cap[] = {
399 WLAN_EID_SUPP_RATES,
400 WLAN_EID_COUNTRY,
401 WLAN_EID_EXT_SUPP_RATES,
402 WLAN_EID_SUPPORTED_CHANNELS,
403 WLAN_EID_RSN,
404 WLAN_EID_EXT_CAPABILITY,
405 WLAN_EID_QOS_CAPA,
406 WLAN_EID_FAST_BSS_TRANSITION,
407 WLAN_EID_TIMEOUT_INTERVAL,
408 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
409 };
410 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
411 before_ht_cap,
412 ARRAY_SIZE(before_ht_cap),
413 offset);
414 pos = skb_put(skb, noffset - offset);
415 memcpy(pos, extra_ies + offset, noffset - offset);
416 offset = noffset;
417 }
418
419 mutex_lock(&local->sta_mtx);
420
421 /* we should have the peer STA if we're already responding */
422 if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
423 sta = sta_info_get(sdata, peer);
424 if (WARN_ON_ONCE(!sta)) {
425 mutex_unlock(&local->sta_mtx);
426 return;
427 }
428
429 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
430 }
431
432 ieee80211_tdls_add_oper_classes(sdata, skb);
433
434 /*
435 * with TDLS we can switch channels, and HT-caps are not necessarily
436 * the same on all bands. The specification limits the setup to a
437 * single HT-cap, so use the current band for now.
438 */
439 sband = local->hw.wiphy->bands[band];
440 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
441
442 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
443 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
444 ht_cap.ht_supported) {
445 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
446
447 /* disable SMPS in TDLS initiator */
448 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
449 << IEEE80211_HT_CAP_SM_PS_SHIFT;
450
451 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
452 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
453 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
454 ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
455 /* the peer caps are already intersected with our own */
456 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
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 }
461
462 if (ht_cap.ht_supported &&
463 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
464 ieee80211_tdls_add_bss_coex_ie(skb);
465
466 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
467
468 /* add any custom IEs that go before VHT capabilities */
469 if (extra_ies_len) {
470 static const u8 before_vht_cap[] = {
471 WLAN_EID_SUPP_RATES,
472 WLAN_EID_COUNTRY,
473 WLAN_EID_EXT_SUPP_RATES,
474 WLAN_EID_SUPPORTED_CHANNELS,
475 WLAN_EID_RSN,
476 WLAN_EID_EXT_CAPABILITY,
477 WLAN_EID_QOS_CAPA,
478 WLAN_EID_FAST_BSS_TRANSITION,
479 WLAN_EID_TIMEOUT_INTERVAL,
480 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
481 WLAN_EID_MULTI_BAND,
482 };
483 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
484 before_vht_cap,
485 ARRAY_SIZE(before_vht_cap),
486 offset);
487 pos = skb_put(skb, noffset - offset);
488 memcpy(pos, extra_ies + offset, noffset - offset);
489 offset = noffset;
490 }
491
492 /* build the VHT-cap similarly to the HT-cap */
493 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
494 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
495 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
496 vht_cap.vht_supported) {
497 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
498
499 /* the AID is present only when VHT is implemented */
500 if (action_code == WLAN_TDLS_SETUP_REQUEST)
501 ieee80211_tdls_add_aid(sdata, skb);
502
503 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
504 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
505 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
506 vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
507 /* the peer caps are already intersected with our own */
508 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
509
510 /* the AID is present only when VHT is implemented */
511 ieee80211_tdls_add_aid(sdata, skb);
512
513 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
514 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
515
516 /*
517 * if both peers support WIDER_BW, we can expand the chandef to
518 * a wider compatible one, up to 80MHz
519 */
520 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
521 ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
522 }
523
524 mutex_unlock(&local->sta_mtx);
525
526 /* add any remaining IEs */
527 if (extra_ies_len) {
528 noffset = extra_ies_len;
529 pos = skb_put(skb, noffset - offset);
530 memcpy(pos, extra_ies + offset, noffset - offset);
531 }
532
533 }
534
535 static void
536 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
537 struct sk_buff *skb, const u8 *peer,
538 bool initiator, const u8 *extra_ies,
539 size_t extra_ies_len)
540 {
541 struct ieee80211_local *local = sdata->local;
542 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
543 size_t offset = 0, noffset;
544 struct sta_info *sta, *ap_sta;
545 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
546 u8 *pos;
547
548 mutex_lock(&local->sta_mtx);
549
550 sta = sta_info_get(sdata, peer);
551 ap_sta = sta_info_get(sdata, ifmgd->bssid);
552 if (WARN_ON_ONCE(!sta || !ap_sta)) {
553 mutex_unlock(&local->sta_mtx);
554 return;
555 }
556
557 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
558
559 /* add any custom IEs that go before the QoS IE */
560 if (extra_ies_len) {
561 static const u8 before_qos[] = {
562 WLAN_EID_RSN,
563 };
564 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
565 before_qos,
566 ARRAY_SIZE(before_qos),
567 offset);
568 pos = skb_put(skb, noffset - offset);
569 memcpy(pos, extra_ies + offset, noffset - offset);
570 offset = noffset;
571 }
572
573 /* add the QoS param IE if both the peer and we support it */
574 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
575 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
576
577 /* add any custom IEs that go before HT operation */
578 if (extra_ies_len) {
579 static const u8 before_ht_op[] = {
580 WLAN_EID_RSN,
581 WLAN_EID_QOS_CAPA,
582 WLAN_EID_FAST_BSS_TRANSITION,
583 WLAN_EID_TIMEOUT_INTERVAL,
584 };
585 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
586 before_ht_op,
587 ARRAY_SIZE(before_ht_op),
588 offset);
589 pos = skb_put(skb, noffset - offset);
590 memcpy(pos, extra_ies + offset, noffset - offset);
591 offset = noffset;
592 }
593
594 /* if HT support is only added in TDLS, we need an HT-operation IE */
595 if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
596 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
597 /* send an empty HT operation IE */
598 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
599 &sdata->vif.bss_conf.chandef, 0);
600 }
601
602 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
603
604 /* only include VHT-operation if not on the 2.4GHz band */
605 if (band != IEEE80211_BAND_2GHZ && sta->sta.vht_cap.vht_supported) {
606 /*
607 * if both peers support WIDER_BW, we can expand the chandef to
608 * a wider compatible one, up to 80MHz
609 */
610 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
611 ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
612
613 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
614 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
615 &sta->tdls_chandef);
616 }
617
618 mutex_unlock(&local->sta_mtx);
619
620 /* add any remaining IEs */
621 if (extra_ies_len) {
622 noffset = extra_ies_len;
623 pos = skb_put(skb, noffset - offset);
624 memcpy(pos, extra_ies + offset, noffset - offset);
625 }
626 }
627
628 static void
629 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
630 struct sk_buff *skb, const u8 *peer,
631 bool initiator, const u8 *extra_ies,
632 size_t extra_ies_len, u8 oper_class,
633 struct cfg80211_chan_def *chandef)
634 {
635 struct ieee80211_tdls_data *tf;
636 size_t offset = 0, noffset;
637 u8 *pos;
638
639 if (WARN_ON_ONCE(!chandef))
640 return;
641
642 tf = (void *)skb->data;
643 tf->u.chan_switch_req.target_channel =
644 ieee80211_frequency_to_channel(chandef->chan->center_freq);
645 tf->u.chan_switch_req.oper_class = oper_class;
646
647 if (extra_ies_len) {
648 static const u8 before_lnkie[] = {
649 WLAN_EID_SECONDARY_CHANNEL_OFFSET,
650 };
651 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
652 before_lnkie,
653 ARRAY_SIZE(before_lnkie),
654 offset);
655 pos = skb_put(skb, noffset - offset);
656 memcpy(pos, extra_ies + offset, noffset - offset);
657 offset = noffset;
658 }
659
660 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
661
662 /* add any remaining IEs */
663 if (extra_ies_len) {
664 noffset = extra_ies_len;
665 pos = skb_put(skb, noffset - offset);
666 memcpy(pos, extra_ies + offset, noffset - offset);
667 }
668 }
669
670 static void
671 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
672 struct sk_buff *skb, const u8 *peer,
673 u16 status_code, bool initiator,
674 const u8 *extra_ies,
675 size_t extra_ies_len)
676 {
677 if (status_code == 0)
678 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
679
680 if (extra_ies_len)
681 memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
682 }
683
684 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
685 struct sk_buff *skb, const u8 *peer,
686 u8 action_code, u16 status_code,
687 bool initiator, const u8 *extra_ies,
688 size_t extra_ies_len, u8 oper_class,
689 struct cfg80211_chan_def *chandef)
690 {
691 switch (action_code) {
692 case WLAN_TDLS_SETUP_REQUEST:
693 case WLAN_TDLS_SETUP_RESPONSE:
694 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
695 if (status_code == 0)
696 ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
697 action_code,
698 initiator,
699 extra_ies,
700 extra_ies_len);
701 break;
702 case WLAN_TDLS_SETUP_CONFIRM:
703 if (status_code == 0)
704 ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
705 initiator, extra_ies,
706 extra_ies_len);
707 break;
708 case WLAN_TDLS_TEARDOWN:
709 case WLAN_TDLS_DISCOVERY_REQUEST:
710 if (extra_ies_len)
711 memcpy(skb_put(skb, extra_ies_len), extra_ies,
712 extra_ies_len);
713 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
714 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
715 break;
716 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
717 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
718 initiator, extra_ies,
719 extra_ies_len,
720 oper_class, chandef);
721 break;
722 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
723 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
724 status_code,
725 initiator, extra_ies,
726 extra_ies_len);
727 break;
728 }
729
730 }
731
732 static int
733 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
734 const u8 *peer, u8 action_code, u8 dialog_token,
735 u16 status_code, struct sk_buff *skb)
736 {
737 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
738 struct ieee80211_tdls_data *tf;
739
740 tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
741
742 memcpy(tf->da, peer, ETH_ALEN);
743 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
744 tf->ether_type = cpu_to_be16(ETH_P_TDLS);
745 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
746
747 /* network header is after the ethernet header */
748 skb_set_network_header(skb, ETH_HLEN);
749
750 switch (action_code) {
751 case WLAN_TDLS_SETUP_REQUEST:
752 tf->category = WLAN_CATEGORY_TDLS;
753 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
754
755 skb_put(skb, sizeof(tf->u.setup_req));
756 tf->u.setup_req.dialog_token = dialog_token;
757 tf->u.setup_req.capability =
758 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
759 status_code));
760 break;
761 case WLAN_TDLS_SETUP_RESPONSE:
762 tf->category = WLAN_CATEGORY_TDLS;
763 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
764
765 skb_put(skb, sizeof(tf->u.setup_resp));
766 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
767 tf->u.setup_resp.dialog_token = dialog_token;
768 tf->u.setup_resp.capability =
769 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
770 status_code));
771 break;
772 case WLAN_TDLS_SETUP_CONFIRM:
773 tf->category = WLAN_CATEGORY_TDLS;
774 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
775
776 skb_put(skb, sizeof(tf->u.setup_cfm));
777 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
778 tf->u.setup_cfm.dialog_token = dialog_token;
779 break;
780 case WLAN_TDLS_TEARDOWN:
781 tf->category = WLAN_CATEGORY_TDLS;
782 tf->action_code = WLAN_TDLS_TEARDOWN;
783
784 skb_put(skb, sizeof(tf->u.teardown));
785 tf->u.teardown.reason_code = cpu_to_le16(status_code);
786 break;
787 case WLAN_TDLS_DISCOVERY_REQUEST:
788 tf->category = WLAN_CATEGORY_TDLS;
789 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
790
791 skb_put(skb, sizeof(tf->u.discover_req));
792 tf->u.discover_req.dialog_token = dialog_token;
793 break;
794 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
795 tf->category = WLAN_CATEGORY_TDLS;
796 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
797
798 skb_put(skb, sizeof(tf->u.chan_switch_req));
799 break;
800 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
801 tf->category = WLAN_CATEGORY_TDLS;
802 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
803
804 skb_put(skb, sizeof(tf->u.chan_switch_resp));
805 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
806 break;
807 default:
808 return -EINVAL;
809 }
810
811 return 0;
812 }
813
814 static int
815 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
816 const u8 *peer, u8 action_code, u8 dialog_token,
817 u16 status_code, struct sk_buff *skb)
818 {
819 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
820 struct ieee80211_mgmt *mgmt;
821
822 mgmt = (void *)skb_put(skb, 24);
823 memset(mgmt, 0, 24);
824 memcpy(mgmt->da, peer, ETH_ALEN);
825 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
826 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
827
828 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
829 IEEE80211_STYPE_ACTION);
830
831 switch (action_code) {
832 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
833 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
834 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
835 mgmt->u.action.u.tdls_discover_resp.action_code =
836 WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
837 mgmt->u.action.u.tdls_discover_resp.dialog_token =
838 dialog_token;
839 mgmt->u.action.u.tdls_discover_resp.capability =
840 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
841 status_code));
842 break;
843 default:
844 return -EINVAL;
845 }
846
847 return 0;
848 }
849
850 static struct sk_buff *
851 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
852 const u8 *peer, u8 action_code,
853 u8 dialog_token, u16 status_code,
854 bool initiator, const u8 *extra_ies,
855 size_t extra_ies_len, u8 oper_class,
856 struct cfg80211_chan_def *chandef)
857 {
858 struct ieee80211_local *local = sdata->local;
859 struct sk_buff *skb;
860 int ret;
861
862 skb = netdev_alloc_skb(sdata->dev,
863 local->hw.extra_tx_headroom +
864 max(sizeof(struct ieee80211_mgmt),
865 sizeof(struct ieee80211_tdls_data)) +
866 50 + /* supported rates */
867 10 + /* ext capab */
868 26 + /* max(WMM-info, WMM-param) */
869 2 + max(sizeof(struct ieee80211_ht_cap),
870 sizeof(struct ieee80211_ht_operation)) +
871 2 + max(sizeof(struct ieee80211_vht_cap),
872 sizeof(struct ieee80211_vht_operation)) +
873 50 + /* supported channels */
874 3 + /* 40/20 BSS coex */
875 4 + /* AID */
876 4 + /* oper classes */
877 extra_ies_len +
878 sizeof(struct ieee80211_tdls_lnkie));
879 if (!skb)
880 return NULL;
881
882 skb_reserve(skb, local->hw.extra_tx_headroom);
883
884 switch (action_code) {
885 case WLAN_TDLS_SETUP_REQUEST:
886 case WLAN_TDLS_SETUP_RESPONSE:
887 case WLAN_TDLS_SETUP_CONFIRM:
888 case WLAN_TDLS_TEARDOWN:
889 case WLAN_TDLS_DISCOVERY_REQUEST:
890 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
891 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
892 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
893 sdata->dev, peer,
894 action_code, dialog_token,
895 status_code, skb);
896 break;
897 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
898 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
899 peer, action_code,
900 dialog_token, status_code,
901 skb);
902 break;
903 default:
904 ret = -ENOTSUPP;
905 break;
906 }
907
908 if (ret < 0)
909 goto fail;
910
911 ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
912 initiator, extra_ies, extra_ies_len, oper_class,
913 chandef);
914 return skb;
915
916 fail:
917 dev_kfree_skb(skb);
918 return NULL;
919 }
920
921 static int
922 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
923 const u8 *peer, u8 action_code, u8 dialog_token,
924 u16 status_code, u32 peer_capability,
925 bool initiator, const u8 *extra_ies,
926 size_t extra_ies_len, u8 oper_class,
927 struct cfg80211_chan_def *chandef)
928 {
929 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
930 struct sk_buff *skb = NULL;
931 struct sta_info *sta;
932 u32 flags = 0;
933 int ret = 0;
934
935 rcu_read_lock();
936 sta = sta_info_get(sdata, peer);
937
938 /* infer the initiator if we can, to support old userspace */
939 switch (action_code) {
940 case WLAN_TDLS_SETUP_REQUEST:
941 if (sta) {
942 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
943 sta->sta.tdls_initiator = false;
944 }
945 /* fall-through */
946 case WLAN_TDLS_SETUP_CONFIRM:
947 case WLAN_TDLS_DISCOVERY_REQUEST:
948 initiator = true;
949 break;
950 case WLAN_TDLS_SETUP_RESPONSE:
951 /*
952 * In some testing scenarios, we send a request and response.
953 * Make the last packet sent take effect for the initiator
954 * value.
955 */
956 if (sta) {
957 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
958 sta->sta.tdls_initiator = true;
959 }
960 /* fall-through */
961 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
962 initiator = false;
963 break;
964 case WLAN_TDLS_TEARDOWN:
965 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
966 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
967 /* any value is ok */
968 break;
969 default:
970 ret = -ENOTSUPP;
971 break;
972 }
973
974 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
975 initiator = true;
976
977 rcu_read_unlock();
978 if (ret < 0)
979 goto fail;
980
981 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
982 dialog_token, status_code,
983 initiator, extra_ies,
984 extra_ies_len, oper_class,
985 chandef);
986 if (!skb) {
987 ret = -EINVAL;
988 goto fail;
989 }
990
991 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
992 ieee80211_tx_skb(sdata, skb);
993 return 0;
994 }
995
996 /*
997 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
998 * we should default to AC_VI.
999 */
1000 switch (action_code) {
1001 case WLAN_TDLS_SETUP_REQUEST:
1002 case WLAN_TDLS_SETUP_RESPONSE:
1003 skb_set_queue_mapping(skb, IEEE80211_AC_BK);
1004 skb->priority = 2;
1005 break;
1006 default:
1007 skb_set_queue_mapping(skb, IEEE80211_AC_VI);
1008 skb->priority = 5;
1009 break;
1010 }
1011
1012 /*
1013 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1014 * Later, if no ACK is returned from peer, we will re-send the teardown
1015 * packet through the AP.
1016 */
1017 if ((action_code == WLAN_TDLS_TEARDOWN) &&
1018 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1019 bool try_resend; /* Should we keep skb for possible resend */
1020
1021 /* If not sending directly to peer - no point in keeping skb */
1022 rcu_read_lock();
1023 sta = sta_info_get(sdata, peer);
1024 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1025 rcu_read_unlock();
1026
1027 spin_lock_bh(&sdata->u.mgd.teardown_lock);
1028 if (try_resend && !sdata->u.mgd.teardown_skb) {
1029 /* Mark it as requiring TX status callback */
1030 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1031 IEEE80211_TX_INTFL_MLME_CONN_TX;
1032
1033 /*
1034 * skb is copied since mac80211 will later set
1035 * properties that might not be the same as the AP,
1036 * such as encryption, QoS, addresses, etc.
1037 *
1038 * No problem if skb_copy() fails, so no need to check.
1039 */
1040 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1041 sdata->u.mgd.orig_teardown_skb = skb;
1042 }
1043 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1044 }
1045
1046 /* disable bottom halves when entering the Tx path */
1047 local_bh_disable();
1048 __ieee80211_subif_start_xmit(skb, dev, flags);
1049 local_bh_enable();
1050
1051 return ret;
1052
1053 fail:
1054 dev_kfree_skb(skb);
1055 return ret;
1056 }
1057
1058 static int
1059 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1060 const u8 *peer, u8 action_code, u8 dialog_token,
1061 u16 status_code, u32 peer_capability, bool initiator,
1062 const u8 *extra_ies, size_t extra_ies_len)
1063 {
1064 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1065 struct ieee80211_local *local = sdata->local;
1066 enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode;
1067 int ret;
1068
1069 /* don't support setup with forced SMPS mode that's not off */
1070 if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1071 smps_mode != IEEE80211_SMPS_OFF) {
1072 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1073 smps_mode);
1074 return -ENOTSUPP;
1075 }
1076
1077 mutex_lock(&local->mtx);
1078
1079 /* we don't support concurrent TDLS peer setups */
1080 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1081 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1082 ret = -EBUSY;
1083 goto out_unlock;
1084 }
1085
1086 /*
1087 * make sure we have a STA representing the peer so we drop or buffer
1088 * non-TDLS-setup frames to the peer. We can't send other packets
1089 * during setup through the AP path.
1090 * Allow error packets to be sent - sometimes we don't even add a STA
1091 * before failing the setup.
1092 */
1093 if (status_code == 0) {
1094 rcu_read_lock();
1095 if (!sta_info_get(sdata, peer)) {
1096 rcu_read_unlock();
1097 ret = -ENOLINK;
1098 goto out_unlock;
1099 }
1100 rcu_read_unlock();
1101 }
1102
1103 ieee80211_flush_queues(local, sdata, false);
1104 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1105 mutex_unlock(&local->mtx);
1106
1107 /* we cannot take the mutex while preparing the setup packet */
1108 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1109 dialog_token, status_code,
1110 peer_capability, initiator,
1111 extra_ies, extra_ies_len, 0,
1112 NULL);
1113 if (ret < 0) {
1114 mutex_lock(&local->mtx);
1115 eth_zero_addr(sdata->u.mgd.tdls_peer);
1116 mutex_unlock(&local->mtx);
1117 return ret;
1118 }
1119
1120 ieee80211_queue_delayed_work(&sdata->local->hw,
1121 &sdata->u.mgd.tdls_peer_del_work,
1122 TDLS_PEER_SETUP_TIMEOUT);
1123 return 0;
1124
1125 out_unlock:
1126 mutex_unlock(&local->mtx);
1127 return ret;
1128 }
1129
1130 static int
1131 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1132 const u8 *peer, u8 action_code, u8 dialog_token,
1133 u16 status_code, u32 peer_capability,
1134 bool initiator, const u8 *extra_ies,
1135 size_t extra_ies_len)
1136 {
1137 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1138 struct ieee80211_local *local = sdata->local;
1139 struct sta_info *sta;
1140 int ret;
1141
1142 /*
1143 * No packets can be transmitted to the peer via the AP during setup -
1144 * the STA is set as a TDLS peer, but is not authorized.
1145 * During teardown, we prevent direct transmissions by stopping the
1146 * queues and flushing all direct packets.
1147 */
1148 ieee80211_stop_vif_queues(local, sdata,
1149 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1150 ieee80211_flush_queues(local, sdata, false);
1151
1152 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1153 dialog_token, status_code,
1154 peer_capability, initiator,
1155 extra_ies, extra_ies_len, 0,
1156 NULL);
1157 if (ret < 0)
1158 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1159 ret);
1160
1161 /*
1162 * Remove the STA AUTH flag to force further traffic through the AP. If
1163 * the STA was unreachable, it was already removed.
1164 */
1165 rcu_read_lock();
1166 sta = sta_info_get(sdata, peer);
1167 if (sta)
1168 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1169 rcu_read_unlock();
1170
1171 ieee80211_wake_vif_queues(local, sdata,
1172 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1173
1174 return 0;
1175 }
1176
1177 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1178 const u8 *peer, u8 action_code, u8 dialog_token,
1179 u16 status_code, u32 peer_capability,
1180 bool initiator, const u8 *extra_ies,
1181 size_t extra_ies_len)
1182 {
1183 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1184 int ret;
1185
1186 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1187 return -ENOTSUPP;
1188
1189 /* make sure we are in managed mode, and associated */
1190 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1191 !sdata->u.mgd.associated)
1192 return -EINVAL;
1193
1194 switch (action_code) {
1195 case WLAN_TDLS_SETUP_REQUEST:
1196 case WLAN_TDLS_SETUP_RESPONSE:
1197 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1198 dialog_token, status_code,
1199 peer_capability, initiator,
1200 extra_ies, extra_ies_len);
1201 break;
1202 case WLAN_TDLS_TEARDOWN:
1203 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1204 action_code, dialog_token,
1205 status_code,
1206 peer_capability, initiator,
1207 extra_ies, extra_ies_len);
1208 break;
1209 case WLAN_TDLS_DISCOVERY_REQUEST:
1210 /*
1211 * Protect the discovery so we can hear the TDLS discovery
1212 * response frame. It is transmitted directly and not buffered
1213 * by the AP.
1214 */
1215 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1216 /* fall-through */
1217 case WLAN_TDLS_SETUP_CONFIRM:
1218 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1219 /* no special handling */
1220 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1221 action_code,
1222 dialog_token,
1223 status_code,
1224 peer_capability,
1225 initiator, extra_ies,
1226 extra_ies_len, 0, NULL);
1227 break;
1228 default:
1229 ret = -EOPNOTSUPP;
1230 break;
1231 }
1232
1233 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1234 action_code, peer, ret);
1235 return ret;
1236 }
1237
1238 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata)
1239 {
1240 struct ieee80211_local *local = sdata->local;
1241 struct ieee80211_chanctx_conf *conf;
1242 struct ieee80211_chanctx *ctx;
1243
1244 mutex_lock(&local->chanctx_mtx);
1245 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1246 lockdep_is_held(&local->chanctx_mtx));
1247 if (conf) {
1248 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1249 ieee80211_recalc_chanctx_chantype(local, ctx);
1250 }
1251 mutex_unlock(&local->chanctx_mtx);
1252 }
1253
1254 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1255 {
1256 struct sta_info *sta;
1257 bool result = false;
1258
1259 rcu_read_lock();
1260 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1261 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1262 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1263 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1264 !sta->sta.ht_cap.ht_supported)
1265 continue;
1266 result = true;
1267 break;
1268 }
1269 rcu_read_unlock();
1270
1271 return result;
1272 }
1273
1274 static void
1275 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1276 struct sta_info *sta)
1277 {
1278 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1279 bool tdls_ht;
1280 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1281 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1282 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1283 u16 opmode;
1284
1285 /* Nothing to do if the BSS connection uses HT */
1286 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
1287 return;
1288
1289 tdls_ht = (sta && sta->sta.ht_cap.ht_supported) ||
1290 iee80211_tdls_have_ht_peers(sdata);
1291
1292 opmode = sdata->vif.bss_conf.ht_operation_mode;
1293
1294 if (tdls_ht)
1295 opmode |= protection;
1296 else
1297 opmode &= ~protection;
1298
1299 if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1300 return;
1301
1302 sdata->vif.bss_conf.ht_operation_mode = opmode;
1303 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT);
1304 }
1305
1306 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1307 const u8 *peer, enum nl80211_tdls_operation oper)
1308 {
1309 struct sta_info *sta;
1310 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1311 struct ieee80211_local *local = sdata->local;
1312 int ret;
1313
1314 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1315 return -ENOTSUPP;
1316
1317 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1318 return -EINVAL;
1319
1320 switch (oper) {
1321 case NL80211_TDLS_ENABLE_LINK:
1322 case NL80211_TDLS_DISABLE_LINK:
1323 break;
1324 case NL80211_TDLS_TEARDOWN:
1325 case NL80211_TDLS_SETUP:
1326 case NL80211_TDLS_DISCOVERY_REQ:
1327 /* We don't support in-driver setup/teardown/discovery */
1328 return -ENOTSUPP;
1329 }
1330
1331 /* protect possible bss_conf changes and avoid concurrency in
1332 * ieee80211_bss_info_change_notify()
1333 */
1334 sdata_lock(sdata);
1335 mutex_lock(&local->mtx);
1336 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1337
1338 switch (oper) {
1339 case NL80211_TDLS_ENABLE_LINK:
1340 if (sdata->vif.csa_active) {
1341 tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1342 ret = -EBUSY;
1343 break;
1344 }
1345
1346 iee80211_tdls_recalc_chanctx(sdata);
1347
1348 mutex_lock(&local->sta_mtx);
1349 sta = sta_info_get(sdata, peer);
1350 if (!sta) {
1351 mutex_unlock(&local->sta_mtx);
1352 ret = -ENOLINK;
1353 break;
1354 }
1355
1356 iee80211_tdls_recalc_ht_protection(sdata, sta);
1357
1358 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1359 mutex_unlock(&local->sta_mtx);
1360
1361 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1362 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1363 ret = 0;
1364 break;
1365 case NL80211_TDLS_DISABLE_LINK:
1366 /*
1367 * The teardown message in ieee80211_tdls_mgmt_teardown() was
1368 * created while the queues were stopped, so it might still be
1369 * pending. Before flushing the queues we need to be sure the
1370 * message is handled by the tasklet handling pending messages,
1371 * otherwise we might start destroying the station before
1372 * sending the teardown packet.
1373 * Note that this only forces the tasklet to flush pendings -
1374 * not to stop the tasklet from rescheduling itself.
1375 */
1376 tasklet_kill(&local->tx_pending_tasklet);
1377 /* flush a potentially queued teardown packet */
1378 ieee80211_flush_queues(local, sdata, false);
1379
1380 ret = sta_info_destroy_addr(sdata, peer);
1381
1382 mutex_lock(&local->sta_mtx);
1383 iee80211_tdls_recalc_ht_protection(sdata, NULL);
1384 mutex_unlock(&local->sta_mtx);
1385
1386 iee80211_tdls_recalc_chanctx(sdata);
1387 break;
1388 default:
1389 ret = -ENOTSUPP;
1390 break;
1391 }
1392
1393 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1394 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1395 eth_zero_addr(sdata->u.mgd.tdls_peer);
1396 }
1397
1398 if (ret == 0)
1399 ieee80211_queue_work(&sdata->local->hw,
1400 &sdata->u.mgd.request_smps_work);
1401
1402 mutex_unlock(&local->mtx);
1403 sdata_unlock(sdata);
1404 return ret;
1405 }
1406
1407 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1408 enum nl80211_tdls_operation oper,
1409 u16 reason_code, gfp_t gfp)
1410 {
1411 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1412
1413 if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1414 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1415 oper);
1416 return;
1417 }
1418
1419 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1420 }
1421 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1422
1423 static void
1424 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1425 {
1426 struct ieee80211_ch_switch_timing *ch_sw;
1427
1428 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1429 *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1430
1431 ch_sw = (void *)buf;
1432 ch_sw->switch_time = cpu_to_le16(switch_time);
1433 ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1434 }
1435
1436 /* find switch timing IE in SKB ready for Tx */
1437 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1438 {
1439 struct ieee80211_tdls_data *tf;
1440 const u8 *ie_start;
1441
1442 /*
1443 * Get the offset for the new location of the switch timing IE.
1444 * The SKB network header will now point to the "payload_type"
1445 * element of the TDLS data frame struct.
1446 */
1447 tf = container_of(skb->data + skb_network_offset(skb),
1448 struct ieee80211_tdls_data, payload_type);
1449 ie_start = tf->u.chan_switch_req.variable;
1450 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1451 skb->len - (ie_start - skb->data));
1452 }
1453
1454 static struct sk_buff *
1455 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1456 struct cfg80211_chan_def *chandef,
1457 u32 *ch_sw_tm_ie_offset)
1458 {
1459 struct ieee80211_sub_if_data *sdata = sta->sdata;
1460 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1461 2 + sizeof(struct ieee80211_ch_switch_timing)];
1462 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1463 u8 *pos = extra_ies;
1464 struct sk_buff *skb;
1465
1466 /*
1467 * if chandef points to a wide channel add a Secondary-Channel
1468 * Offset information element
1469 */
1470 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1471 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1472 bool ht40plus;
1473
1474 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1475 *pos++ = sizeof(*sec_chan_ie);
1476 sec_chan_ie = (void *)pos;
1477
1478 ht40plus = cfg80211_get_chandef_type(chandef) ==
1479 NL80211_CHAN_HT40PLUS;
1480 sec_chan_ie->sec_chan_offs = ht40plus ?
1481 IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1482 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1483 pos += sizeof(*sec_chan_ie);
1484
1485 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1486 }
1487
1488 /* just set the values to 0, this is a template */
1489 iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1490
1491 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1492 WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1493 0, 0, !sta->sta.tdls_initiator,
1494 extra_ies, extra_ies_len,
1495 oper_class, chandef);
1496 if (!skb)
1497 return NULL;
1498
1499 skb = ieee80211_build_data_template(sdata, skb, 0);
1500 if (IS_ERR(skb)) {
1501 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1502 return NULL;
1503 }
1504
1505 if (ch_sw_tm_ie_offset) {
1506 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1507
1508 if (!tm_ie) {
1509 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1510 dev_kfree_skb_any(skb);
1511 return NULL;
1512 }
1513
1514 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1515 }
1516
1517 tdls_dbg(sdata,
1518 "TDLS channel switch request template for %pM ch %d width %d\n",
1519 sta->sta.addr, chandef->chan->center_freq, chandef->width);
1520 return skb;
1521 }
1522
1523 int
1524 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1525 const u8 *addr, u8 oper_class,
1526 struct cfg80211_chan_def *chandef)
1527 {
1528 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1529 struct ieee80211_local *local = sdata->local;
1530 struct sta_info *sta;
1531 struct sk_buff *skb = NULL;
1532 u32 ch_sw_tm_ie;
1533 int ret;
1534
1535 mutex_lock(&local->sta_mtx);
1536 sta = sta_info_get(sdata, addr);
1537 if (!sta) {
1538 tdls_dbg(sdata,
1539 "Invalid TDLS peer %pM for channel switch request\n",
1540 addr);
1541 ret = -ENOENT;
1542 goto out;
1543 }
1544
1545 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1546 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1547 addr);
1548 ret = -ENOTSUPP;
1549 goto out;
1550 }
1551
1552 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1553 &ch_sw_tm_ie);
1554 if (!skb) {
1555 ret = -ENOENT;
1556 goto out;
1557 }
1558
1559 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1560 chandef, skb, ch_sw_tm_ie);
1561 if (!ret)
1562 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1563
1564 out:
1565 mutex_unlock(&local->sta_mtx);
1566 dev_kfree_skb_any(skb);
1567 return ret;
1568 }
1569
1570 void
1571 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1572 struct net_device *dev,
1573 const u8 *addr)
1574 {
1575 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1576 struct ieee80211_local *local = sdata->local;
1577 struct sta_info *sta;
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 cancel\n",
1584 addr);
1585 goto out;
1586 }
1587
1588 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1589 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1590 addr);
1591 goto out;
1592 }
1593
1594 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1595 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1596
1597 out:
1598 mutex_unlock(&local->sta_mtx);
1599 }
1600
1601 static struct sk_buff *
1602 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1603 u32 *ch_sw_tm_ie_offset)
1604 {
1605 struct ieee80211_sub_if_data *sdata = sta->sdata;
1606 struct sk_buff *skb;
1607 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1608
1609 /* initial timing are always zero in the template */
1610 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1611
1612 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1613 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1614 0, 0, !sta->sta.tdls_initiator,
1615 extra_ies, sizeof(extra_ies), 0, NULL);
1616 if (!skb)
1617 return NULL;
1618
1619 skb = ieee80211_build_data_template(sdata, skb, 0);
1620 if (IS_ERR(skb)) {
1621 tdls_dbg(sdata,
1622 "Failed building TDLS channel switch resp frame\n");
1623 return NULL;
1624 }
1625
1626 if (ch_sw_tm_ie_offset) {
1627 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1628
1629 if (!tm_ie) {
1630 tdls_dbg(sdata,
1631 "No switch timing IE in TDLS switch resp\n");
1632 dev_kfree_skb_any(skb);
1633 return NULL;
1634 }
1635
1636 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1637 }
1638
1639 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1640 sta->sta.addr);
1641 return skb;
1642 }
1643
1644 static int
1645 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1646 struct sk_buff *skb)
1647 {
1648 struct ieee80211_local *local = sdata->local;
1649 struct ieee802_11_elems elems;
1650 struct sta_info *sta;
1651 struct ieee80211_tdls_data *tf = (void *)skb->data;
1652 bool local_initiator;
1653 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1654 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1655 struct ieee80211_tdls_ch_sw_params params = {};
1656 int ret;
1657
1658 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1659 params.timestamp = rx_status->device_timestamp;
1660
1661 if (skb->len < baselen) {
1662 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1663 skb->len);
1664 return -EINVAL;
1665 }
1666
1667 mutex_lock(&local->sta_mtx);
1668 sta = sta_info_get(sdata, tf->sa);
1669 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1670 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1671 tf->sa);
1672 ret = -EINVAL;
1673 goto out;
1674 }
1675
1676 params.sta = &sta->sta;
1677 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1678 if (params.status != 0) {
1679 ret = 0;
1680 goto call_drv;
1681 }
1682
1683 ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1684 skb->len - baselen, false, &elems);
1685 if (elems.parse_error) {
1686 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1687 ret = -EINVAL;
1688 goto out;
1689 }
1690
1691 if (!elems.ch_sw_timing || !elems.lnk_id) {
1692 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1693 ret = -EINVAL;
1694 goto out;
1695 }
1696
1697 /* validate the initiator is set correctly */
1698 local_initiator =
1699 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1700 if (local_initiator == sta->sta.tdls_initiator) {
1701 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1702 ret = -EINVAL;
1703 goto out;
1704 }
1705
1706 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1707 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1708
1709 params.tmpl_skb =
1710 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1711 if (!params.tmpl_skb) {
1712 ret = -ENOENT;
1713 goto out;
1714 }
1715
1716 call_drv:
1717 drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1718
1719 tdls_dbg(sdata,
1720 "TDLS channel switch response received from %pM status %d\n",
1721 tf->sa, params.status);
1722
1723 out:
1724 mutex_unlock(&local->sta_mtx);
1725 dev_kfree_skb_any(params.tmpl_skb);
1726 return ret;
1727 }
1728
1729 static int
1730 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1731 struct sk_buff *skb)
1732 {
1733 struct ieee80211_local *local = sdata->local;
1734 struct ieee802_11_elems elems;
1735 struct cfg80211_chan_def chandef;
1736 struct ieee80211_channel *chan;
1737 enum nl80211_channel_type chan_type;
1738 int freq;
1739 u8 target_channel, oper_class;
1740 bool local_initiator;
1741 struct sta_info *sta;
1742 enum ieee80211_band band;
1743 struct ieee80211_tdls_data *tf = (void *)skb->data;
1744 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1745 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1746 struct ieee80211_tdls_ch_sw_params params = {};
1747 int ret = 0;
1748
1749 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1750 params.timestamp = rx_status->device_timestamp;
1751
1752 if (skb->len < baselen) {
1753 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1754 skb->len);
1755 return -EINVAL;
1756 }
1757
1758 target_channel = tf->u.chan_switch_req.target_channel;
1759 oper_class = tf->u.chan_switch_req.oper_class;
1760
1761 /*
1762 * We can't easily infer the channel band. The operating class is
1763 * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1764 * solution here is to treat channels with number >14 as 5GHz ones,
1765 * and specifically check for the (oper_class, channel) combinations
1766 * where this doesn't hold. These are thankfully unique according to
1767 * IEEE802.11-2012.
1768 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1769 * valid here.
1770 */
1771 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1772 oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1773 target_channel < 14)
1774 band = IEEE80211_BAND_5GHZ;
1775 else
1776 band = target_channel < 14 ? IEEE80211_BAND_2GHZ :
1777 IEEE80211_BAND_5GHZ;
1778
1779 freq = ieee80211_channel_to_frequency(target_channel, band);
1780 if (freq == 0) {
1781 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1782 target_channel);
1783 return -EINVAL;
1784 }
1785
1786 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1787 if (!chan) {
1788 tdls_dbg(sdata,
1789 "Unsupported channel for TDLS chan switch: %d\n",
1790 target_channel);
1791 return -EINVAL;
1792 }
1793
1794 ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1795 skb->len - baselen, false, &elems);
1796 if (elems.parse_error) {
1797 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1798 return -EINVAL;
1799 }
1800
1801 if (!elems.ch_sw_timing || !elems.lnk_id) {
1802 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1803 return -EINVAL;
1804 }
1805
1806 if (!elems.sec_chan_offs) {
1807 chan_type = NL80211_CHAN_HT20;
1808 } else {
1809 switch (elems.sec_chan_offs->sec_chan_offs) {
1810 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1811 chan_type = NL80211_CHAN_HT40PLUS;
1812 break;
1813 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1814 chan_type = NL80211_CHAN_HT40MINUS;
1815 break;
1816 default:
1817 chan_type = NL80211_CHAN_HT20;
1818 break;
1819 }
1820 }
1821
1822 cfg80211_chandef_create(&chandef, chan, chan_type);
1823
1824 /* we will be active on the TDLS link */
1825 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1826 sdata->wdev.iftype)) {
1827 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1828 return -EINVAL;
1829 }
1830
1831 mutex_lock(&local->sta_mtx);
1832 sta = sta_info_get(sdata, tf->sa);
1833 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1834 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1835 tf->sa);
1836 ret = -EINVAL;
1837 goto out;
1838 }
1839
1840 params.sta = &sta->sta;
1841
1842 /* validate the initiator is set correctly */
1843 local_initiator =
1844 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1845 if (local_initiator == sta->sta.tdls_initiator) {
1846 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1847 ret = -EINVAL;
1848 goto out;
1849 }
1850
1851 /* peer should have known better */
1852 if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs &&
1853 elems.sec_chan_offs->sec_chan_offs) {
1854 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1855 ret = -ENOTSUPP;
1856 goto out;
1857 }
1858
1859 params.chandef = &chandef;
1860 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1861 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1862
1863 params.tmpl_skb =
1864 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1865 &params.ch_sw_tm_ie);
1866 if (!params.tmpl_skb) {
1867 ret = -ENOENT;
1868 goto out;
1869 }
1870
1871 drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1872
1873 tdls_dbg(sdata,
1874 "TDLS ch switch request received from %pM ch %d width %d\n",
1875 tf->sa, params.chandef->chan->center_freq,
1876 params.chandef->width);
1877 out:
1878 mutex_unlock(&local->sta_mtx);
1879 dev_kfree_skb_any(params.tmpl_skb);
1880 return ret;
1881 }
1882
1883 static void
1884 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1885 struct sk_buff *skb)
1886 {
1887 struct ieee80211_tdls_data *tf = (void *)skb->data;
1888 struct wiphy *wiphy = sdata->local->hw.wiphy;
1889
1890 ASSERT_RTNL();
1891
1892 /* make sure the driver supports it */
1893 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1894 return;
1895
1896 /* we want to access the entire packet */
1897 if (skb_linearize(skb))
1898 return;
1899 /*
1900 * The packet/size was already validated by mac80211 Rx path, only look
1901 * at the action type.
1902 */
1903 switch (tf->action_code) {
1904 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1905 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1906 break;
1907 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1908 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1909 break;
1910 default:
1911 WARN_ON_ONCE(1);
1912 return;
1913 }
1914 }
1915
1916 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1917 {
1918 struct sta_info *sta;
1919 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1920
1921 rcu_read_lock();
1922 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1923 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1924 !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1925 continue;
1926
1927 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1928 NL80211_TDLS_TEARDOWN, reason,
1929 GFP_ATOMIC);
1930 }
1931 rcu_read_unlock();
1932 }
1933
1934 void ieee80211_tdls_chsw_work(struct work_struct *wk)
1935 {
1936 struct ieee80211_local *local =
1937 container_of(wk, struct ieee80211_local, tdls_chsw_work);
1938 struct ieee80211_sub_if_data *sdata;
1939 struct sk_buff *skb;
1940 struct ieee80211_tdls_data *tf;
1941
1942 rtnl_lock();
1943 while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) {
1944 tf = (struct ieee80211_tdls_data *)skb->data;
1945 list_for_each_entry(sdata, &local->interfaces, list) {
1946 if (!ieee80211_sdata_running(sdata) ||
1947 sdata->vif.type != NL80211_IFTYPE_STATION ||
1948 !ether_addr_equal(tf->da, sdata->vif.addr))
1949 continue;
1950
1951 ieee80211_process_tdls_channel_switch(sdata, skb);
1952 break;
1953 }
1954
1955 kfree_skb(skb);
1956 }
1957 rtnl_unlock();
1958 }
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