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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / net / mac80211 / tdls.c
blob5cd5e6e5834efc820c94d299dadfd9164e217253
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 bool buffer_sta = ieee80211_hw_check(&local->hw,
51 SUPPORTS_TDLS_BUFFER_STA);
52 struct ieee80211_supported_band *sband = ieee80211_get_sband(sdata);
53 bool vht = sband && sband->vht_cap.vht_supported;
54 u8 *pos = skb_put(skb, 10);
55
56 *pos++ = WLAN_EID_EXT_CAPABILITY;
57 *pos++ = 8; /* len */
58 *pos++ = 0x0;
59 *pos++ = 0x0;
60 *pos++ = 0x0;
61 *pos++ = (chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0) |
62 (buffer_sta ? WLAN_EXT_CAPA4_TDLS_BUFFER_STA : 0);
63 *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
64 *pos++ = 0;
65 *pos++ = 0;
66 *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
67 }
68
69 static u8
70 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
71 struct sk_buff *skb, u16 start, u16 end,
72 u16 spacing)
73 {
74 u8 subband_cnt = 0, ch_cnt = 0;
75 struct ieee80211_channel *ch;
76 struct cfg80211_chan_def chandef;
77 int i, subband_start;
78 struct wiphy *wiphy = sdata->local->hw.wiphy;
79
80 for (i = start; i <= end; i += spacing) {
81 if (!ch_cnt)
82 subband_start = i;
83
84 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
85 if (ch) {
86 /* we will be active on the channel */
87 cfg80211_chandef_create(&chandef, ch,
88 NL80211_CHAN_NO_HT);
89 if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
90 sdata->wdev.iftype)) {
91 ch_cnt++;
92 /*
93 * check if the next channel is also part of
94 * this allowed range
95 */
96 continue;
97 }
98 }
99
100 /*
101 * we've reached the end of a range, with allowed channels
102 * found
103 */
104 if (ch_cnt) {
105 u8 *pos = skb_put(skb, 2);
106 *pos++ = ieee80211_frequency_to_channel(subband_start);
107 *pos++ = ch_cnt;
108
109 subband_cnt++;
110 ch_cnt = 0;
111 }
112 }
113
114 /* all channels in the requested range are allowed - add them here */
115 if (ch_cnt) {
116 u8 *pos = skb_put(skb, 2);
117 *pos++ = ieee80211_frequency_to_channel(subband_start);
118 *pos++ = ch_cnt;
119
120 subband_cnt++;
121 }
122
123 return subband_cnt;
124 }
125
126 static void
127 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
128 struct sk_buff *skb)
129 {
130 /*
131 * Add possible channels for TDLS. These are channels that are allowed
132 * to be active.
133 */
134 u8 subband_cnt;
135 u8 *pos = skb_put(skb, 2);
136
137 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
138
139 /*
140 * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
141 * this doesn't happen in real world scenarios.
142 */
143
144 /* 2GHz, with 5MHz spacing */
145 subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
146
147 /* 5GHz, with 20MHz spacing */
148 subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
149
150 /* length */
151 *pos = 2 * subband_cnt;
152 }
153
154 static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata,
155 struct sk_buff *skb)
156 {
157 u8 *pos;
158 u8 op_class;
159
160 if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef,
161 &op_class))
162 return;
163
164 pos = skb_put(skb, 4);
165 *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
166 *pos++ = 2; /* len */
167
168 *pos++ = op_class;
169 *pos++ = op_class; /* give current operating class as alternate too */
170 }
171
172 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
173 {
174 u8 *pos = skb_put(skb, 3);
175
176 *pos++ = WLAN_EID_BSS_COEX_2040;
177 *pos++ = 1; /* len */
178
179 *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
180 }
181
182 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
183 u16 status_code)
184 {
185 struct ieee80211_supported_band *sband;
186
187 /* The capability will be 0 when sending a failure code */
188 if (status_code != 0)
189 return 0;
190
191 sband = ieee80211_get_sband(sdata);
192 if (sband && sband->band == NL80211_BAND_2GHZ) {
193 return WLAN_CAPABILITY_SHORT_SLOT_TIME |
194 WLAN_CAPABILITY_SHORT_PREAMBLE;
195 }
196
197 return 0;
198 }
199
200 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
201 struct sk_buff *skb, const u8 *peer,
202 bool initiator)
203 {
204 struct ieee80211_tdls_lnkie *lnkid;
205 const u8 *init_addr, *rsp_addr;
206
207 if (initiator) {
208 init_addr = sdata->vif.addr;
209 rsp_addr = peer;
210 } else {
211 init_addr = peer;
212 rsp_addr = sdata->vif.addr;
213 }
214
215 lnkid = skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
216
217 lnkid->ie_type = WLAN_EID_LINK_ID;
218 lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
219
220 memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
221 memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
222 memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
223 }
224
225 static void
226 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
227 {
228 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
229 u8 *pos = skb_put(skb, 4);
230
231 *pos++ = WLAN_EID_AID;
232 *pos++ = 2; /* len */
233 put_unaligned_le16(ifmgd->aid, pos);
234 }
235
236 /* translate numbering in the WMM parameter IE to the mac80211 notation */
237 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
238 {
239 switch (ac) {
240 default:
241 WARN_ON_ONCE(1);
242 /* fall through */
243 case 0:
244 return IEEE80211_AC_BE;
245 case 1:
246 return IEEE80211_AC_BK;
247 case 2:
248 return IEEE80211_AC_VI;
249 case 3:
250 return IEEE80211_AC_VO;
251 }
252 }
253
254 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
255 {
256 u8 ret;
257
258 ret = aifsn & 0x0f;
259 if (acm)
260 ret |= 0x10;
261 ret |= (aci << 5) & 0x60;
262 return ret;
263 }
264
265 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
266 {
267 return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
268 ((ilog2(cw_max + 1) << 0x4) & 0xf0);
269 }
270
271 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
272 struct sk_buff *skb)
273 {
274 struct ieee80211_wmm_param_ie *wmm;
275 struct ieee80211_tx_queue_params *txq;
276 int i;
277
278 wmm = skb_put_zero(skb, sizeof(*wmm));
279
280 wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
281 wmm->len = sizeof(*wmm) - 2;
282
283 wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
284 wmm->oui[1] = 0x50;
285 wmm->oui[2] = 0xf2;
286 wmm->oui_type = 2; /* WME */
287 wmm->oui_subtype = 1; /* WME param */
288 wmm->version = 1; /* WME ver */
289 wmm->qos_info = 0; /* U-APSD not in use */
290
291 /*
292 * Use the EDCA parameters defined for the BSS, or default if the AP
293 * doesn't support it, as mandated by 802.11-2012 section 10.22.4
294 */
295 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
296 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
297 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
298 txq->acm, i);
299 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
300 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
301 }
302 }
303
304 static void
305 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
306 struct sta_info *sta)
307 {
308 /* IEEE802.11ac-2013 Table E-4 */
309 u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
310 struct cfg80211_chan_def uc = sta->tdls_chandef;
311 enum nl80211_chan_width max_width = ieee80211_sta_cap_chan_bw(sta);
312 int i;
313
314 /* only support upgrading non-narrow channels up to 80Mhz */
315 if (max_width == NL80211_CHAN_WIDTH_5 ||
316 max_width == NL80211_CHAN_WIDTH_10)
317 return;
318
319 if (max_width > NL80211_CHAN_WIDTH_80)
320 max_width = NL80211_CHAN_WIDTH_80;
321
322 if (uc.width >= max_width)
323 return;
324 /*
325 * Channel usage constrains in the IEEE802.11ac-2013 specification only
326 * allow expanding a 20MHz channel to 80MHz in a single way. In
327 * addition, there are no 40MHz allowed channels that are not part of
328 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
329 */
330 for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
331 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
332 uc.center_freq1 = centers_80mhz[i];
333 uc.center_freq2 = 0;
334 uc.width = NL80211_CHAN_WIDTH_80;
335 break;
336 }
337
338 if (!uc.center_freq1)
339 return;
340
341 /* proceed to downgrade the chandef until usable or the same as AP BW */
342 while (uc.width > max_width ||
343 (uc.width > sta->tdls_chandef.width &&
344 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
345 sdata->wdev.iftype)))
346 ieee80211_chandef_downgrade(&uc);
347
348 if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
349 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
350 sta->tdls_chandef.width, uc.width);
351
352 /*
353 * the station is not yet authorized when BW upgrade is done,
354 * locking is not required
355 */
356 sta->tdls_chandef = uc;
357 }
358 }
359
360 static void
361 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
362 struct sk_buff *skb, const u8 *peer,
363 u8 action_code, bool initiator,
364 const u8 *extra_ies, size_t extra_ies_len)
365 {
366 struct ieee80211_supported_band *sband;
367 struct ieee80211_local *local = sdata->local;
368 struct ieee80211_sta_ht_cap ht_cap;
369 struct ieee80211_sta_vht_cap vht_cap;
370 struct sta_info *sta = NULL;
371 size_t offset = 0, noffset;
372 u8 *pos;
373
374 sband = ieee80211_get_sband(sdata);
375 if (!sband)
376 return;
377
378 ieee80211_add_srates_ie(sdata, skb, false, sband->band);
379 ieee80211_add_ext_srates_ie(sdata, skb, false, sband->band);
380 ieee80211_tdls_add_supp_channels(sdata, skb);
381
382 /* add any custom IEs that go before Extended Capabilities */
383 if (extra_ies_len) {
384 static const u8 before_ext_cap[] = {
385 WLAN_EID_SUPP_RATES,
386 WLAN_EID_COUNTRY,
387 WLAN_EID_EXT_SUPP_RATES,
388 WLAN_EID_SUPPORTED_CHANNELS,
389 WLAN_EID_RSN,
390 };
391 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
392 before_ext_cap,
393 ARRAY_SIZE(before_ext_cap),
394 offset);
395 skb_put_data(skb, extra_ies + offset, noffset - offset);
396 offset = noffset;
397 }
398
399 ieee80211_tdls_add_ext_capab(sdata, skb);
400
401 /* add the QoS element if we support it */
402 if (local->hw.queues >= IEEE80211_NUM_ACS &&
403 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
404 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
405
406 /* add any custom IEs that go before HT capabilities */
407 if (extra_ies_len) {
408 static const u8 before_ht_cap[] = {
409 WLAN_EID_SUPP_RATES,
410 WLAN_EID_COUNTRY,
411 WLAN_EID_EXT_SUPP_RATES,
412 WLAN_EID_SUPPORTED_CHANNELS,
413 WLAN_EID_RSN,
414 WLAN_EID_EXT_CAPABILITY,
415 WLAN_EID_QOS_CAPA,
416 WLAN_EID_FAST_BSS_TRANSITION,
417 WLAN_EID_TIMEOUT_INTERVAL,
418 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
419 };
420 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
421 before_ht_cap,
422 ARRAY_SIZE(before_ht_cap),
423 offset);
424 skb_put_data(skb, extra_ies + offset, noffset - offset);
425 offset = noffset;
426 }
427
428 mutex_lock(&local->sta_mtx);
429
430 /* we should have the peer STA if we're already responding */
431 if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
432 sta = sta_info_get(sdata, peer);
433 if (WARN_ON_ONCE(!sta)) {
434 mutex_unlock(&local->sta_mtx);
435 return;
436 }
437
438 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
439 }
440
441 ieee80211_tdls_add_oper_classes(sdata, skb);
442
443 /*
444 * with TDLS we can switch channels, and HT-caps are not necessarily
445 * the same on all bands. The specification limits the setup to a
446 * single HT-cap, so use the current band for now.
447 */
448 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
449
450 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
451 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
452 ht_cap.ht_supported) {
453 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
454
455 /* disable SMPS in TDLS initiator */
456 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
457 << IEEE80211_HT_CAP_SM_PS_SHIFT;
458
459 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
460 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
461 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
462 ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
463 /* the peer caps are already intersected with our own */
464 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
465
466 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
467 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
468 }
469
470 if (ht_cap.ht_supported &&
471 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
472 ieee80211_tdls_add_bss_coex_ie(skb);
473
474 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
475
476 /* add any custom IEs that go before VHT capabilities */
477 if (extra_ies_len) {
478 static const u8 before_vht_cap[] = {
479 WLAN_EID_SUPP_RATES,
480 WLAN_EID_COUNTRY,
481 WLAN_EID_EXT_SUPP_RATES,
482 WLAN_EID_SUPPORTED_CHANNELS,
483 WLAN_EID_RSN,
484 WLAN_EID_EXT_CAPABILITY,
485 WLAN_EID_QOS_CAPA,
486 WLAN_EID_FAST_BSS_TRANSITION,
487 WLAN_EID_TIMEOUT_INTERVAL,
488 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
489 WLAN_EID_MULTI_BAND,
490 };
491 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
492 before_vht_cap,
493 ARRAY_SIZE(before_vht_cap),
494 offset);
495 skb_put_data(skb, 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 skb_put_data(skb, extra_ies + offset, noffset - offset);
537 }
538
539 }
540
541 static void
542 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
543 struct sk_buff *skb, const u8 *peer,
544 bool initiator, const u8 *extra_ies,
545 size_t extra_ies_len)
546 {
547 struct ieee80211_local *local = sdata->local;
548 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
549 size_t offset = 0, noffset;
550 struct sta_info *sta, *ap_sta;
551 struct ieee80211_supported_band *sband;
552 u8 *pos;
553
554 sband = ieee80211_get_sband(sdata);
555 if (!sband)
556 return;
557
558 mutex_lock(&local->sta_mtx);
559
560 sta = sta_info_get(sdata, peer);
561 ap_sta = sta_info_get(sdata, ifmgd->bssid);
562 if (WARN_ON_ONCE(!sta || !ap_sta)) {
563 mutex_unlock(&local->sta_mtx);
564 return;
565 }
566
567 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
568
569 /* add any custom IEs that go before the QoS IE */
570 if (extra_ies_len) {
571 static const u8 before_qos[] = {
572 WLAN_EID_RSN,
573 };
574 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
575 before_qos,
576 ARRAY_SIZE(before_qos),
577 offset);
578 skb_put_data(skb, extra_ies + offset, noffset - offset);
579 offset = noffset;
580 }
581
582 /* add the QoS param IE if both the peer and we support it */
583 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
584 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
585
586 /* add any custom IEs that go before HT operation */
587 if (extra_ies_len) {
588 static const u8 before_ht_op[] = {
589 WLAN_EID_RSN,
590 WLAN_EID_QOS_CAPA,
591 WLAN_EID_FAST_BSS_TRANSITION,
592 WLAN_EID_TIMEOUT_INTERVAL,
593 };
594 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
595 before_ht_op,
596 ARRAY_SIZE(before_ht_op),
597 offset);
598 skb_put_data(skb, extra_ies + offset, noffset - offset);
599 offset = noffset;
600 }
601
602 /*
603 * if HT support is only added in TDLS, we need an HT-operation IE.
604 * add the IE as required by IEEE802.11-2012 9.23.3.2.
605 */
606 if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
607 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
608 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
609 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
610
611 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
612 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
613 &sdata->vif.bss_conf.chandef, prot,
614 true);
615 }
616
617 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
618
619 /* only include VHT-operation if not on the 2.4GHz band */
620 if (sband->band != NL80211_BAND_2GHZ &&
621 sta->sta.vht_cap.vht_supported) {
622 /*
623 * if both peers support WIDER_BW, we can expand the chandef to
624 * a wider compatible one, up to 80MHz
625 */
626 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
627 ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
628
629 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
630 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
631 &sta->tdls_chandef);
632 }
633
634 mutex_unlock(&local->sta_mtx);
635
636 /* add any remaining IEs */
637 if (extra_ies_len) {
638 noffset = extra_ies_len;
639 skb_put_data(skb, extra_ies + offset, noffset - offset);
640 }
641 }
642
643 static void
644 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
645 struct sk_buff *skb, const u8 *peer,
646 bool initiator, const u8 *extra_ies,
647 size_t extra_ies_len, u8 oper_class,
648 struct cfg80211_chan_def *chandef)
649 {
650 struct ieee80211_tdls_data *tf;
651 size_t offset = 0, noffset;
652
653 if (WARN_ON_ONCE(!chandef))
654 return;
655
656 tf = (void *)skb->data;
657 tf->u.chan_switch_req.target_channel =
658 ieee80211_frequency_to_channel(chandef->chan->center_freq);
659 tf->u.chan_switch_req.oper_class = oper_class;
660
661 if (extra_ies_len) {
662 static const u8 before_lnkie[] = {
663 WLAN_EID_SECONDARY_CHANNEL_OFFSET,
664 };
665 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
666 before_lnkie,
667 ARRAY_SIZE(before_lnkie),
668 offset);
669 skb_put_data(skb, extra_ies + offset, noffset - offset);
670 offset = noffset;
671 }
672
673 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
674
675 /* add any remaining IEs */
676 if (extra_ies_len) {
677 noffset = extra_ies_len;
678 skb_put_data(skb, extra_ies + offset, noffset - offset);
679 }
680 }
681
682 static void
683 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
684 struct sk_buff *skb, const u8 *peer,
685 u16 status_code, bool initiator,
686 const u8 *extra_ies,
687 size_t extra_ies_len)
688 {
689 if (status_code == 0)
690 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
691
692 if (extra_ies_len)
693 skb_put_data(skb, extra_ies, extra_ies_len);
694 }
695
696 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
697 struct sk_buff *skb, const u8 *peer,
698 u8 action_code, u16 status_code,
699 bool initiator, const u8 *extra_ies,
700 size_t extra_ies_len, u8 oper_class,
701 struct cfg80211_chan_def *chandef)
702 {
703 switch (action_code) {
704 case WLAN_TDLS_SETUP_REQUEST:
705 case WLAN_TDLS_SETUP_RESPONSE:
706 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
707 if (status_code == 0)
708 ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
709 action_code,
710 initiator,
711 extra_ies,
712 extra_ies_len);
713 break;
714 case WLAN_TDLS_SETUP_CONFIRM:
715 if (status_code == 0)
716 ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
717 initiator, extra_ies,
718 extra_ies_len);
719 break;
720 case WLAN_TDLS_TEARDOWN:
721 case WLAN_TDLS_DISCOVERY_REQUEST:
722 if (extra_ies_len)
723 skb_put_data(skb, extra_ies, extra_ies_len);
724 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
725 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
726 break;
727 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
728 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
729 initiator, extra_ies,
730 extra_ies_len,
731 oper_class, chandef);
732 break;
733 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
734 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
735 status_code,
736 initiator, extra_ies,
737 extra_ies_len);
738 break;
739 }
740
741 }
742
743 static int
744 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
745 const u8 *peer, u8 action_code, u8 dialog_token,
746 u16 status_code, struct sk_buff *skb)
747 {
748 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
749 struct ieee80211_tdls_data *tf;
750
751 tf = skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
752
753 memcpy(tf->da, peer, ETH_ALEN);
754 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
755 tf->ether_type = cpu_to_be16(ETH_P_TDLS);
756 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
757
758 /* network header is after the ethernet header */
759 skb_set_network_header(skb, ETH_HLEN);
760
761 switch (action_code) {
762 case WLAN_TDLS_SETUP_REQUEST:
763 tf->category = WLAN_CATEGORY_TDLS;
764 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
765
766 skb_put(skb, sizeof(tf->u.setup_req));
767 tf->u.setup_req.dialog_token = dialog_token;
768 tf->u.setup_req.capability =
769 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
770 status_code));
771 break;
772 case WLAN_TDLS_SETUP_RESPONSE:
773 tf->category = WLAN_CATEGORY_TDLS;
774 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
775
776 skb_put(skb, sizeof(tf->u.setup_resp));
777 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
778 tf->u.setup_resp.dialog_token = dialog_token;
779 tf->u.setup_resp.capability =
780 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
781 status_code));
782 break;
783 case WLAN_TDLS_SETUP_CONFIRM:
784 tf->category = WLAN_CATEGORY_TDLS;
785 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
786
787 skb_put(skb, sizeof(tf->u.setup_cfm));
788 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
789 tf->u.setup_cfm.dialog_token = dialog_token;
790 break;
791 case WLAN_TDLS_TEARDOWN:
792 tf->category = WLAN_CATEGORY_TDLS;
793 tf->action_code = WLAN_TDLS_TEARDOWN;
794
795 skb_put(skb, sizeof(tf->u.teardown));
796 tf->u.teardown.reason_code = cpu_to_le16(status_code);
797 break;
798 case WLAN_TDLS_DISCOVERY_REQUEST:
799 tf->category = WLAN_CATEGORY_TDLS;
800 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
801
802 skb_put(skb, sizeof(tf->u.discover_req));
803 tf->u.discover_req.dialog_token = dialog_token;
804 break;
805 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
806 tf->category = WLAN_CATEGORY_TDLS;
807 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
808
809 skb_put(skb, sizeof(tf->u.chan_switch_req));
810 break;
811 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
812 tf->category = WLAN_CATEGORY_TDLS;
813 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
814
815 skb_put(skb, sizeof(tf->u.chan_switch_resp));
816 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
817 break;
818 default:
819 return -EINVAL;
820 }
821
822 return 0;
823 }
824
825 static int
826 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
827 const u8 *peer, u8 action_code, u8 dialog_token,
828 u16 status_code, struct sk_buff *skb)
829 {
830 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
831 struct ieee80211_mgmt *mgmt;
832
833 mgmt = skb_put_zero(skb, 24);
834 memcpy(mgmt->da, peer, ETH_ALEN);
835 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
836 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
837
838 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
839 IEEE80211_STYPE_ACTION);
840
841 switch (action_code) {
842 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
843 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
844 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
845 mgmt->u.action.u.tdls_discover_resp.action_code =
846 WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
847 mgmt->u.action.u.tdls_discover_resp.dialog_token =
848 dialog_token;
849 mgmt->u.action.u.tdls_discover_resp.capability =
850 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
851 status_code));
852 break;
853 default:
854 return -EINVAL;
855 }
856
857 return 0;
858 }
859
860 static struct sk_buff *
861 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
862 const u8 *peer, u8 action_code,
863 u8 dialog_token, u16 status_code,
864 bool initiator, const u8 *extra_ies,
865 size_t extra_ies_len, u8 oper_class,
866 struct cfg80211_chan_def *chandef)
867 {
868 struct ieee80211_local *local = sdata->local;
869 struct sk_buff *skb;
870 int ret;
871
872 skb = netdev_alloc_skb(sdata->dev,
873 local->hw.extra_tx_headroom +
874 max(sizeof(struct ieee80211_mgmt),
875 sizeof(struct ieee80211_tdls_data)) +
876 50 + /* supported rates */
877 10 + /* ext capab */
878 26 + /* max(WMM-info, WMM-param) */
879 2 + max(sizeof(struct ieee80211_ht_cap),
880 sizeof(struct ieee80211_ht_operation)) +
881 2 + max(sizeof(struct ieee80211_vht_cap),
882 sizeof(struct ieee80211_vht_operation)) +
883 50 + /* supported channels */
884 3 + /* 40/20 BSS coex */
885 4 + /* AID */
886 4 + /* oper classes */
887 extra_ies_len +
888 sizeof(struct ieee80211_tdls_lnkie));
889 if (!skb)
890 return NULL;
891
892 skb_reserve(skb, local->hw.extra_tx_headroom);
893
894 switch (action_code) {
895 case WLAN_TDLS_SETUP_REQUEST:
896 case WLAN_TDLS_SETUP_RESPONSE:
897 case WLAN_TDLS_SETUP_CONFIRM:
898 case WLAN_TDLS_TEARDOWN:
899 case WLAN_TDLS_DISCOVERY_REQUEST:
900 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
901 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
902 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
903 sdata->dev, peer,
904 action_code, dialog_token,
905 status_code, skb);
906 break;
907 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
908 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
909 peer, action_code,
910 dialog_token, status_code,
911 skb);
912 break;
913 default:
914 ret = -ENOTSUPP;
915 break;
916 }
917
918 if (ret < 0)
919 goto fail;
920
921 ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
922 initiator, extra_ies, extra_ies_len, oper_class,
923 chandef);
924 return skb;
925
926 fail:
927 dev_kfree_skb(skb);
928 return NULL;
929 }
930
931 static int
932 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
933 const u8 *peer, u8 action_code, u8 dialog_token,
934 u16 status_code, u32 peer_capability,
935 bool initiator, const u8 *extra_ies,
936 size_t extra_ies_len, u8 oper_class,
937 struct cfg80211_chan_def *chandef)
938 {
939 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
940 struct sk_buff *skb = NULL;
941 struct sta_info *sta;
942 u32 flags = 0;
943 int ret = 0;
944
945 rcu_read_lock();
946 sta = sta_info_get(sdata, peer);
947
948 /* infer the initiator if we can, to support old userspace */
949 switch (action_code) {
950 case WLAN_TDLS_SETUP_REQUEST:
951 if (sta) {
952 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
953 sta->sta.tdls_initiator = false;
954 }
955 /* fall-through */
956 case WLAN_TDLS_SETUP_CONFIRM:
957 case WLAN_TDLS_DISCOVERY_REQUEST:
958 initiator = true;
959 break;
960 case WLAN_TDLS_SETUP_RESPONSE:
961 /*
962 * In some testing scenarios, we send a request and response.
963 * Make the last packet sent take effect for the initiator
964 * value.
965 */
966 if (sta) {
967 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
968 sta->sta.tdls_initiator = true;
969 }
970 /* fall-through */
971 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
972 initiator = false;
973 break;
974 case WLAN_TDLS_TEARDOWN:
975 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
976 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
977 /* any value is ok */
978 break;
979 default:
980 ret = -ENOTSUPP;
981 break;
982 }
983
984 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
985 initiator = true;
986
987 rcu_read_unlock();
988 if (ret < 0)
989 goto fail;
990
991 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
992 dialog_token, status_code,
993 initiator, extra_ies,
994 extra_ies_len, oper_class,
995 chandef);
996 if (!skb) {
997 ret = -EINVAL;
998 goto fail;
999 }
1000
1001 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
1002 ieee80211_tx_skb(sdata, skb);
1003 return 0;
1004 }
1005
1006 /*
1007 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1008 * we should default to AC_VI.
1009 */
1010 switch (action_code) {
1011 case WLAN_TDLS_SETUP_REQUEST:
1012 case WLAN_TDLS_SETUP_RESPONSE:
1013 skb_set_queue_mapping(skb, IEEE80211_AC_BK);
1014 skb->priority = 2;
1015 break;
1016 default:
1017 skb_set_queue_mapping(skb, IEEE80211_AC_VI);
1018 skb->priority = 5;
1019 break;
1020 }
1021
1022 /*
1023 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1024 * Later, if no ACK is returned from peer, we will re-send the teardown
1025 * packet through the AP.
1026 */
1027 if ((action_code == WLAN_TDLS_TEARDOWN) &&
1028 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1029 bool try_resend; /* Should we keep skb for possible resend */
1030
1031 /* If not sending directly to peer - no point in keeping skb */
1032 rcu_read_lock();
1033 sta = sta_info_get(sdata, peer);
1034 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1035 rcu_read_unlock();
1036
1037 spin_lock_bh(&sdata->u.mgd.teardown_lock);
1038 if (try_resend && !sdata->u.mgd.teardown_skb) {
1039 /* Mark it as requiring TX status callback */
1040 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1041 IEEE80211_TX_INTFL_MLME_CONN_TX;
1042
1043 /*
1044 * skb is copied since mac80211 will later set
1045 * properties that might not be the same as the AP,
1046 * such as encryption, QoS, addresses, etc.
1047 *
1048 * No problem if skb_copy() fails, so no need to check.
1049 */
1050 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1051 sdata->u.mgd.orig_teardown_skb = skb;
1052 }
1053 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1054 }
1055
1056 /* disable bottom halves when entering the Tx path */
1057 local_bh_disable();
1058 __ieee80211_subif_start_xmit(skb, dev, flags);
1059 local_bh_enable();
1060
1061 return ret;
1062
1063 fail:
1064 dev_kfree_skb(skb);
1065 return ret;
1066 }
1067
1068 static int
1069 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1070 const u8 *peer, u8 action_code, u8 dialog_token,
1071 u16 status_code, u32 peer_capability, bool initiator,
1072 const u8 *extra_ies, size_t extra_ies_len)
1073 {
1074 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1075 struct ieee80211_local *local = sdata->local;
1076 enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode;
1077 int ret;
1078
1079 /* don't support setup with forced SMPS mode that's not off */
1080 if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1081 smps_mode != IEEE80211_SMPS_OFF) {
1082 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1083 smps_mode);
1084 return -ENOTSUPP;
1085 }
1086
1087 mutex_lock(&local->mtx);
1088
1089 /* we don't support concurrent TDLS peer setups */
1090 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1091 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1092 ret = -EBUSY;
1093 goto out_unlock;
1094 }
1095
1096 /*
1097 * make sure we have a STA representing the peer so we drop or buffer
1098 * non-TDLS-setup frames to the peer. We can't send other packets
1099 * during setup through the AP path.
1100 * Allow error packets to be sent - sometimes we don't even add a STA
1101 * before failing the setup.
1102 */
1103 if (status_code == 0) {
1104 rcu_read_lock();
1105 if (!sta_info_get(sdata, peer)) {
1106 rcu_read_unlock();
1107 ret = -ENOLINK;
1108 goto out_unlock;
1109 }
1110 rcu_read_unlock();
1111 }
1112
1113 ieee80211_flush_queues(local, sdata, false);
1114 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1115 mutex_unlock(&local->mtx);
1116
1117 /* we cannot take the mutex while preparing the setup packet */
1118 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1119 dialog_token, status_code,
1120 peer_capability, initiator,
1121 extra_ies, extra_ies_len, 0,
1122 NULL);
1123 if (ret < 0) {
1124 mutex_lock(&local->mtx);
1125 eth_zero_addr(sdata->u.mgd.tdls_peer);
1126 mutex_unlock(&local->mtx);
1127 return ret;
1128 }
1129
1130 ieee80211_queue_delayed_work(&sdata->local->hw,
1131 &sdata->u.mgd.tdls_peer_del_work,
1132 TDLS_PEER_SETUP_TIMEOUT);
1133 return 0;
1134
1135 out_unlock:
1136 mutex_unlock(&local->mtx);
1137 return ret;
1138 }
1139
1140 static int
1141 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1142 const u8 *peer, u8 action_code, u8 dialog_token,
1143 u16 status_code, u32 peer_capability,
1144 bool initiator, const u8 *extra_ies,
1145 size_t extra_ies_len)
1146 {
1147 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1148 struct ieee80211_local *local = sdata->local;
1149 struct sta_info *sta;
1150 int ret;
1151
1152 /*
1153 * No packets can be transmitted to the peer via the AP during setup -
1154 * the STA is set as a TDLS peer, but is not authorized.
1155 * During teardown, we prevent direct transmissions by stopping the
1156 * queues and flushing all direct packets.
1157 */
1158 ieee80211_stop_vif_queues(local, sdata,
1159 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1160 ieee80211_flush_queues(local, sdata, false);
1161
1162 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1163 dialog_token, status_code,
1164 peer_capability, initiator,
1165 extra_ies, extra_ies_len, 0,
1166 NULL);
1167 if (ret < 0)
1168 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1169 ret);
1170
1171 /*
1172 * Remove the STA AUTH flag to force further traffic through the AP. If
1173 * the STA was unreachable, it was already removed.
1174 */
1175 rcu_read_lock();
1176 sta = sta_info_get(sdata, peer);
1177 if (sta)
1178 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1179 rcu_read_unlock();
1180
1181 ieee80211_wake_vif_queues(local, sdata,
1182 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1183
1184 return 0;
1185 }
1186
1187 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1188 const u8 *peer, u8 action_code, u8 dialog_token,
1189 u16 status_code, u32 peer_capability,
1190 bool initiator, const u8 *extra_ies,
1191 size_t extra_ies_len)
1192 {
1193 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1194 int ret;
1195
1196 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1197 return -ENOTSUPP;
1198
1199 /* make sure we are in managed mode, and associated */
1200 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1201 !sdata->u.mgd.associated)
1202 return -EINVAL;
1203
1204 switch (action_code) {
1205 case WLAN_TDLS_SETUP_REQUEST:
1206 case WLAN_TDLS_SETUP_RESPONSE:
1207 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1208 dialog_token, status_code,
1209 peer_capability, initiator,
1210 extra_ies, extra_ies_len);
1211 break;
1212 case WLAN_TDLS_TEARDOWN:
1213 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1214 action_code, dialog_token,
1215 status_code,
1216 peer_capability, initiator,
1217 extra_ies, extra_ies_len);
1218 break;
1219 case WLAN_TDLS_DISCOVERY_REQUEST:
1220 /*
1221 * Protect the discovery so we can hear the TDLS discovery
1222 * response frame. It is transmitted directly and not buffered
1223 * by the AP.
1224 */
1225 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1226 /* fall-through */
1227 case WLAN_TDLS_SETUP_CONFIRM:
1228 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1229 /* no special handling */
1230 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1231 action_code,
1232 dialog_token,
1233 status_code,
1234 peer_capability,
1235 initiator, extra_ies,
1236 extra_ies_len, 0, NULL);
1237 break;
1238 default:
1239 ret = -EOPNOTSUPP;
1240 break;
1241 }
1242
1243 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1244 action_code, peer, ret);
1245 return ret;
1246 }
1247
1248 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1249 struct sta_info *sta)
1250 {
1251 struct ieee80211_local *local = sdata->local;
1252 struct ieee80211_chanctx_conf *conf;
1253 struct ieee80211_chanctx *ctx;
1254 enum nl80211_chan_width width;
1255 struct ieee80211_supported_band *sband;
1256
1257 mutex_lock(&local->chanctx_mtx);
1258 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1259 lockdep_is_held(&local->chanctx_mtx));
1260 if (conf) {
1261 width = conf->def.width;
1262 sband = local->hw.wiphy->bands[conf->def.chan->band];
1263 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1264 ieee80211_recalc_chanctx_chantype(local, ctx);
1265
1266 /* if width changed and a peer is given, update its BW */
1267 if (width != conf->def.width && sta &&
1268 test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1269 enum ieee80211_sta_rx_bandwidth bw;
1270
1271 bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1272 bw = min(bw, ieee80211_sta_cap_rx_bw(sta));
1273 if (bw != sta->sta.bandwidth) {
1274 sta->sta.bandwidth = bw;
1275 rate_control_rate_update(local, sband, sta,
1276 IEEE80211_RC_BW_CHANGED);
1277 /*
1278 * if a TDLS peer BW was updated, we need to
1279 * recalc the chandef width again, to get the
1280 * correct chanctx min_def
1281 */
1282 ieee80211_recalc_chanctx_chantype(local, ctx);
1283 }
1284 }
1285
1286 }
1287 mutex_unlock(&local->chanctx_mtx);
1288 }
1289
1290 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1291 {
1292 struct sta_info *sta;
1293 bool result = false;
1294
1295 rcu_read_lock();
1296 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1297 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1298 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1299 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1300 !sta->sta.ht_cap.ht_supported)
1301 continue;
1302 result = true;
1303 break;
1304 }
1305 rcu_read_unlock();
1306
1307 return result;
1308 }
1309
1310 static void
1311 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1312 struct sta_info *sta)
1313 {
1314 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1315 bool tdls_ht;
1316 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1317 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1318 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1319 u16 opmode;
1320
1321 /* Nothing to do if the BSS connection uses HT */
1322 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
1323 return;
1324
1325 tdls_ht = (sta && sta->sta.ht_cap.ht_supported) ||
1326 iee80211_tdls_have_ht_peers(sdata);
1327
1328 opmode = sdata->vif.bss_conf.ht_operation_mode;
1329
1330 if (tdls_ht)
1331 opmode |= protection;
1332 else
1333 opmode &= ~protection;
1334
1335 if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1336 return;
1337
1338 sdata->vif.bss_conf.ht_operation_mode = opmode;
1339 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT);
1340 }
1341
1342 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1343 const u8 *peer, enum nl80211_tdls_operation oper)
1344 {
1345 struct sta_info *sta;
1346 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1347 struct ieee80211_local *local = sdata->local;
1348 int ret;
1349
1350 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1351 return -ENOTSUPP;
1352
1353 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1354 return -EINVAL;
1355
1356 switch (oper) {
1357 case NL80211_TDLS_ENABLE_LINK:
1358 case NL80211_TDLS_DISABLE_LINK:
1359 break;
1360 case NL80211_TDLS_TEARDOWN:
1361 case NL80211_TDLS_SETUP:
1362 case NL80211_TDLS_DISCOVERY_REQ:
1363 /* We don't support in-driver setup/teardown/discovery */
1364 return -ENOTSUPP;
1365 }
1366
1367 /* protect possible bss_conf changes and avoid concurrency in
1368 * ieee80211_bss_info_change_notify()
1369 */
1370 sdata_lock(sdata);
1371 mutex_lock(&local->mtx);
1372 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1373
1374 switch (oper) {
1375 case NL80211_TDLS_ENABLE_LINK:
1376 if (sdata->vif.csa_active) {
1377 tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1378 ret = -EBUSY;
1379 break;
1380 }
1381
1382 mutex_lock(&local->sta_mtx);
1383 sta = sta_info_get(sdata, peer);
1384 if (!sta) {
1385 mutex_unlock(&local->sta_mtx);
1386 ret = -ENOLINK;
1387 break;
1388 }
1389
1390 iee80211_tdls_recalc_chanctx(sdata, sta);
1391 iee80211_tdls_recalc_ht_protection(sdata, sta);
1392
1393 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1394 mutex_unlock(&local->sta_mtx);
1395
1396 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1397 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1398 ret = 0;
1399 break;
1400 case NL80211_TDLS_DISABLE_LINK:
1401 /*
1402 * The teardown message in ieee80211_tdls_mgmt_teardown() was
1403 * created while the queues were stopped, so it might still be
1404 * pending. Before flushing the queues we need to be sure the
1405 * message is handled by the tasklet handling pending messages,
1406 * otherwise we might start destroying the station before
1407 * sending the teardown packet.
1408 * Note that this only forces the tasklet to flush pendings -
1409 * not to stop the tasklet from rescheduling itself.
1410 */
1411 tasklet_kill(&local->tx_pending_tasklet);
1412 /* flush a potentially queued teardown packet */
1413 ieee80211_flush_queues(local, sdata, false);
1414
1415 ret = sta_info_destroy_addr(sdata, peer);
1416
1417 mutex_lock(&local->sta_mtx);
1418 iee80211_tdls_recalc_ht_protection(sdata, NULL);
1419 mutex_unlock(&local->sta_mtx);
1420
1421 iee80211_tdls_recalc_chanctx(sdata, NULL);
1422 break;
1423 default:
1424 ret = -ENOTSUPP;
1425 break;
1426 }
1427
1428 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1429 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1430 eth_zero_addr(sdata->u.mgd.tdls_peer);
1431 }
1432
1433 if (ret == 0)
1434 ieee80211_queue_work(&sdata->local->hw,
1435 &sdata->u.mgd.request_smps_work);
1436
1437 mutex_unlock(&local->mtx);
1438 sdata_unlock(sdata);
1439 return ret;
1440 }
1441
1442 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1443 enum nl80211_tdls_operation oper,
1444 u16 reason_code, gfp_t gfp)
1445 {
1446 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1447
1448 if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1449 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1450 oper);
1451 return;
1452 }
1453
1454 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1455 }
1456 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1457
1458 static void
1459 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1460 {
1461 struct ieee80211_ch_switch_timing *ch_sw;
1462
1463 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1464 *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1465
1466 ch_sw = (void *)buf;
1467 ch_sw->switch_time = cpu_to_le16(switch_time);
1468 ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1469 }
1470
1471 /* find switch timing IE in SKB ready for Tx */
1472 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1473 {
1474 struct ieee80211_tdls_data *tf;
1475 const u8 *ie_start;
1476
1477 /*
1478 * Get the offset for the new location of the switch timing IE.
1479 * The SKB network header will now point to the "payload_type"
1480 * element of the TDLS data frame struct.
1481 */
1482 tf = container_of(skb->data + skb_network_offset(skb),
1483 struct ieee80211_tdls_data, payload_type);
1484 ie_start = tf->u.chan_switch_req.variable;
1485 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1486 skb->len - (ie_start - skb->data));
1487 }
1488
1489 static struct sk_buff *
1490 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1491 struct cfg80211_chan_def *chandef,
1492 u32 *ch_sw_tm_ie_offset)
1493 {
1494 struct ieee80211_sub_if_data *sdata = sta->sdata;
1495 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1496 2 + sizeof(struct ieee80211_ch_switch_timing)];
1497 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1498 u8 *pos = extra_ies;
1499 struct sk_buff *skb;
1500
1501 /*
1502 * if chandef points to a wide channel add a Secondary-Channel
1503 * Offset information element
1504 */
1505 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1506 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1507 bool ht40plus;
1508
1509 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1510 *pos++ = sizeof(*sec_chan_ie);
1511 sec_chan_ie = (void *)pos;
1512
1513 ht40plus = cfg80211_get_chandef_type(chandef) ==
1514 NL80211_CHAN_HT40PLUS;
1515 sec_chan_ie->sec_chan_offs = ht40plus ?
1516 IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1517 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1518 pos += sizeof(*sec_chan_ie);
1519
1520 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1521 }
1522
1523 /* just set the values to 0, this is a template */
1524 iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1525
1526 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1527 WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1528 0, 0, !sta->sta.tdls_initiator,
1529 extra_ies, extra_ies_len,
1530 oper_class, chandef);
1531 if (!skb)
1532 return NULL;
1533
1534 skb = ieee80211_build_data_template(sdata, skb, 0);
1535 if (IS_ERR(skb)) {
1536 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1537 return NULL;
1538 }
1539
1540 if (ch_sw_tm_ie_offset) {
1541 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1542
1543 if (!tm_ie) {
1544 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1545 dev_kfree_skb_any(skb);
1546 return NULL;
1547 }
1548
1549 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1550 }
1551
1552 tdls_dbg(sdata,
1553 "TDLS channel switch request template for %pM ch %d width %d\n",
1554 sta->sta.addr, chandef->chan->center_freq, chandef->width);
1555 return skb;
1556 }
1557
1558 int
1559 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1560 const u8 *addr, u8 oper_class,
1561 struct cfg80211_chan_def *chandef)
1562 {
1563 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1564 struct ieee80211_local *local = sdata->local;
1565 struct sta_info *sta;
1566 struct sk_buff *skb = NULL;
1567 u32 ch_sw_tm_ie;
1568 int ret;
1569
1570 mutex_lock(&local->sta_mtx);
1571 sta = sta_info_get(sdata, addr);
1572 if (!sta) {
1573 tdls_dbg(sdata,
1574 "Invalid TDLS peer %pM for channel switch request\n",
1575 addr);
1576 ret = -ENOENT;
1577 goto out;
1578 }
1579
1580 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1581 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1582 addr);
1583 ret = -ENOTSUPP;
1584 goto out;
1585 }
1586
1587 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1588 &ch_sw_tm_ie);
1589 if (!skb) {
1590 ret = -ENOENT;
1591 goto out;
1592 }
1593
1594 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1595 chandef, skb, ch_sw_tm_ie);
1596 if (!ret)
1597 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1598
1599 out:
1600 mutex_unlock(&local->sta_mtx);
1601 dev_kfree_skb_any(skb);
1602 return ret;
1603 }
1604
1605 void
1606 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1607 struct net_device *dev,
1608 const u8 *addr)
1609 {
1610 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1611 struct ieee80211_local *local = sdata->local;
1612 struct sta_info *sta;
1613
1614 mutex_lock(&local->sta_mtx);
1615 sta = sta_info_get(sdata, addr);
1616 if (!sta) {
1617 tdls_dbg(sdata,
1618 "Invalid TDLS peer %pM for channel switch cancel\n",
1619 addr);
1620 goto out;
1621 }
1622
1623 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1624 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1625 addr);
1626 goto out;
1627 }
1628
1629 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1630 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1631
1632 out:
1633 mutex_unlock(&local->sta_mtx);
1634 }
1635
1636 static struct sk_buff *
1637 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1638 u32 *ch_sw_tm_ie_offset)
1639 {
1640 struct ieee80211_sub_if_data *sdata = sta->sdata;
1641 struct sk_buff *skb;
1642 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1643
1644 /* initial timing are always zero in the template */
1645 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1646
1647 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1648 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1649 0, 0, !sta->sta.tdls_initiator,
1650 extra_ies, sizeof(extra_ies), 0, NULL);
1651 if (!skb)
1652 return NULL;
1653
1654 skb = ieee80211_build_data_template(sdata, skb, 0);
1655 if (IS_ERR(skb)) {
1656 tdls_dbg(sdata,
1657 "Failed building TDLS channel switch resp frame\n");
1658 return NULL;
1659 }
1660
1661 if (ch_sw_tm_ie_offset) {
1662 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1663
1664 if (!tm_ie) {
1665 tdls_dbg(sdata,
1666 "No switch timing IE in TDLS switch resp\n");
1667 dev_kfree_skb_any(skb);
1668 return NULL;
1669 }
1670
1671 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1672 }
1673
1674 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1675 sta->sta.addr);
1676 return skb;
1677 }
1678
1679 static int
1680 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1681 struct sk_buff *skb)
1682 {
1683 struct ieee80211_local *local = sdata->local;
1684 struct ieee802_11_elems elems;
1685 struct sta_info *sta;
1686 struct ieee80211_tdls_data *tf = (void *)skb->data;
1687 bool local_initiator;
1688 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1689 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1690 struct ieee80211_tdls_ch_sw_params params = {};
1691 int ret;
1692
1693 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1694 params.timestamp = rx_status->device_timestamp;
1695
1696 if (skb->len < baselen) {
1697 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1698 skb->len);
1699 return -EINVAL;
1700 }
1701
1702 mutex_lock(&local->sta_mtx);
1703 sta = sta_info_get(sdata, tf->sa);
1704 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1705 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1706 tf->sa);
1707 ret = -EINVAL;
1708 goto out;
1709 }
1710
1711 params.sta = &sta->sta;
1712 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1713 if (params.status != 0) {
1714 ret = 0;
1715 goto call_drv;
1716 }
1717
1718 ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1719 skb->len - baselen, false, &elems);
1720 if (elems.parse_error) {
1721 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1722 ret = -EINVAL;
1723 goto out;
1724 }
1725
1726 if (!elems.ch_sw_timing || !elems.lnk_id) {
1727 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1728 ret = -EINVAL;
1729 goto out;
1730 }
1731
1732 /* validate the initiator is set correctly */
1733 local_initiator =
1734 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1735 if (local_initiator == sta->sta.tdls_initiator) {
1736 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1737 ret = -EINVAL;
1738 goto out;
1739 }
1740
1741 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1742 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1743
1744 params.tmpl_skb =
1745 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1746 if (!params.tmpl_skb) {
1747 ret = -ENOENT;
1748 goto out;
1749 }
1750
1751 ret = 0;
1752 call_drv:
1753 drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1754
1755 tdls_dbg(sdata,
1756 "TDLS channel switch response received from %pM status %d\n",
1757 tf->sa, params.status);
1758
1759 out:
1760 mutex_unlock(&local->sta_mtx);
1761 dev_kfree_skb_any(params.tmpl_skb);
1762 return ret;
1763 }
1764
1765 static int
1766 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1767 struct sk_buff *skb)
1768 {
1769 struct ieee80211_local *local = sdata->local;
1770 struct ieee802_11_elems elems;
1771 struct cfg80211_chan_def chandef;
1772 struct ieee80211_channel *chan;
1773 enum nl80211_channel_type chan_type;
1774 int freq;
1775 u8 target_channel, oper_class;
1776 bool local_initiator;
1777 struct sta_info *sta;
1778 enum nl80211_band band;
1779 struct ieee80211_tdls_data *tf = (void *)skb->data;
1780 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1781 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1782 struct ieee80211_tdls_ch_sw_params params = {};
1783 int ret = 0;
1784
1785 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1786 params.timestamp = rx_status->device_timestamp;
1787
1788 if (skb->len < baselen) {
1789 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1790 skb->len);
1791 return -EINVAL;
1792 }
1793
1794 target_channel = tf->u.chan_switch_req.target_channel;
1795 oper_class = tf->u.chan_switch_req.oper_class;
1796
1797 /*
1798 * We can't easily infer the channel band. The operating class is
1799 * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1800 * solution here is to treat channels with number >14 as 5GHz ones,
1801 * and specifically check for the (oper_class, channel) combinations
1802 * where this doesn't hold. These are thankfully unique according to
1803 * IEEE802.11-2012.
1804 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1805 * valid here.
1806 */
1807 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1808 oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1809 target_channel < 14)
1810 band = NL80211_BAND_5GHZ;
1811 else
1812 band = target_channel < 14 ? NL80211_BAND_2GHZ :
1813 NL80211_BAND_5GHZ;
1814
1815 freq = ieee80211_channel_to_frequency(target_channel, band);
1816 if (freq == 0) {
1817 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1818 target_channel);
1819 return -EINVAL;
1820 }
1821
1822 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1823 if (!chan) {
1824 tdls_dbg(sdata,
1825 "Unsupported channel for TDLS chan switch: %d\n",
1826 target_channel);
1827 return -EINVAL;
1828 }
1829
1830 ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1831 skb->len - baselen, false, &elems);
1832 if (elems.parse_error) {
1833 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1834 return -EINVAL;
1835 }
1836
1837 if (!elems.ch_sw_timing || !elems.lnk_id) {
1838 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1839 return -EINVAL;
1840 }
1841
1842 if (!elems.sec_chan_offs) {
1843 chan_type = NL80211_CHAN_HT20;
1844 } else {
1845 switch (elems.sec_chan_offs->sec_chan_offs) {
1846 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1847 chan_type = NL80211_CHAN_HT40PLUS;
1848 break;
1849 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1850 chan_type = NL80211_CHAN_HT40MINUS;
1851 break;
1852 default:
1853 chan_type = NL80211_CHAN_HT20;
1854 break;
1855 }
1856 }
1857
1858 cfg80211_chandef_create(&chandef, chan, chan_type);
1859
1860 /* we will be active on the TDLS link */
1861 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1862 sdata->wdev.iftype)) {
1863 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1864 return -EINVAL;
1865 }
1866
1867 mutex_lock(&local->sta_mtx);
1868 sta = sta_info_get(sdata, tf->sa);
1869 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1870 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1871 tf->sa);
1872 ret = -EINVAL;
1873 goto out;
1874 }
1875
1876 params.sta = &sta->sta;
1877
1878 /* validate the initiator is set correctly */
1879 local_initiator =
1880 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1881 if (local_initiator == sta->sta.tdls_initiator) {
1882 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1883 ret = -EINVAL;
1884 goto out;
1885 }
1886
1887 /* peer should have known better */
1888 if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs &&
1889 elems.sec_chan_offs->sec_chan_offs) {
1890 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1891 ret = -ENOTSUPP;
1892 goto out;
1893 }
1894
1895 params.chandef = &chandef;
1896 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1897 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1898
1899 params.tmpl_skb =
1900 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1901 &params.ch_sw_tm_ie);
1902 if (!params.tmpl_skb) {
1903 ret = -ENOENT;
1904 goto out;
1905 }
1906
1907 drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1908
1909 tdls_dbg(sdata,
1910 "TDLS ch switch request received from %pM ch %d width %d\n",
1911 tf->sa, params.chandef->chan->center_freq,
1912 params.chandef->width);
1913 out:
1914 mutex_unlock(&local->sta_mtx);
1915 dev_kfree_skb_any(params.tmpl_skb);
1916 return ret;
1917 }
1918
1919 static void
1920 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1921 struct sk_buff *skb)
1922 {
1923 struct ieee80211_tdls_data *tf = (void *)skb->data;
1924 struct wiphy *wiphy = sdata->local->hw.wiphy;
1925
1926 ASSERT_RTNL();
1927
1928 /* make sure the driver supports it */
1929 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1930 return;
1931
1932 /* we want to access the entire packet */
1933 if (skb_linearize(skb))
1934 return;
1935 /*
1936 * The packet/size was already validated by mac80211 Rx path, only look
1937 * at the action type.
1938 */
1939 switch (tf->action_code) {
1940 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1941 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1942 break;
1943 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1944 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1945 break;
1946 default:
1947 WARN_ON_ONCE(1);
1948 return;
1949 }
1950 }
1951
1952 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1953 {
1954 struct sta_info *sta;
1955 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1956
1957 rcu_read_lock();
1958 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1959 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1960 !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1961 continue;
1962
1963 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1964 NL80211_TDLS_TEARDOWN, reason,
1965 GFP_ATOMIC);
1966 }
1967 rcu_read_unlock();
1968 }
1969
1970 void ieee80211_tdls_chsw_work(struct work_struct *wk)
1971 {
1972 struct ieee80211_local *local =
1973 container_of(wk, struct ieee80211_local, tdls_chsw_work);
1974 struct ieee80211_sub_if_data *sdata;
1975 struct sk_buff *skb;
1976 struct ieee80211_tdls_data *tf;
1977
1978 rtnl_lock();
1979 while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) {
1980 tf = (struct ieee80211_tdls_data *)skb->data;
1981 list_for_each_entry(sdata, &local->interfaces, list) {
1982 if (!ieee80211_sdata_running(sdata) ||
1983 sdata->vif.type != NL80211_IFTYPE_STATION ||
1984 !ether_addr_equal(tf->da, sdata->vif.addr))
1985 continue;
1986
1987 ieee80211_process_tdls_channel_switch(sdata, skb);
1988 break;
1989 }
1990
1991 kfree_skb(skb);
1992 }
1993 rtnl_unlock();
1994 }
CRIS linux kernel tree