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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / net / mac80211 / tdls.c
bloba29ea813b7d52433174fd72310e77788530b9fa9
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 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
51 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
52 bool vht = sband && sband->vht_cap.vht_supported;
53 u8 *pos = (void *)skb_put(skb, 10);
54
55 *pos++ = WLAN_EID_EXT_CAPABILITY;
56 *pos++ = 8; /* len */
57 *pos++ = 0x0;
58 *pos++ = 0x0;
59 *pos++ = 0x0;
60 *pos++ = chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0;
61 *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
62 *pos++ = 0;
63 *pos++ = 0;
64 *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
65 }
66
67 static u8
68 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
69 struct sk_buff *skb, u16 start, u16 end,
70 u16 spacing)
71 {
72 u8 subband_cnt = 0, ch_cnt = 0;
73 struct ieee80211_channel *ch;
74 struct cfg80211_chan_def chandef;
75 int i, subband_start;
76 struct wiphy *wiphy = sdata->local->hw.wiphy;
77
78 for (i = start; i <= end; i += spacing) {
79 if (!ch_cnt)
80 subband_start = i;
81
82 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
83 if (ch) {
84 /* we will be active on the channel */
85 cfg80211_chandef_create(&chandef, ch,
86 NL80211_CHAN_NO_HT);
87 if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
88 sdata->wdev.iftype)) {
89 ch_cnt++;
90 /*
91 * check if the next channel is also part of
92 * this allowed range
93 */
94 continue;
95 }
96 }
97
98 /*
99 * we've reached the end of a range, with allowed channels
100 * found
101 */
102 if (ch_cnt) {
103 u8 *pos = skb_put(skb, 2);
104 *pos++ = ieee80211_frequency_to_channel(subband_start);
105 *pos++ = ch_cnt;
106
107 subband_cnt++;
108 ch_cnt = 0;
109 }
110 }
111
112 /* all channels in the requested range are allowed - add them here */
113 if (ch_cnt) {
114 u8 *pos = skb_put(skb, 2);
115 *pos++ = ieee80211_frequency_to_channel(subband_start);
116 *pos++ = ch_cnt;
117
118 subband_cnt++;
119 }
120
121 return subband_cnt;
122 }
123
124 static void
125 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
126 struct sk_buff *skb)
127 {
128 /*
129 * Add possible channels for TDLS. These are channels that are allowed
130 * to be active.
131 */
132 u8 subband_cnt;
133 u8 *pos = skb_put(skb, 2);
134
135 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
136
137 /*
138 * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
139 * this doesn't happen in real world scenarios.
140 */
141
142 /* 2GHz, with 5MHz spacing */
143 subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
144
145 /* 5GHz, with 20MHz spacing */
146 subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
147
148 /* length */
149 *pos = 2 * subband_cnt;
150 }
151
152 static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata,
153 struct sk_buff *skb)
154 {
155 u8 *pos;
156 u8 op_class;
157
158 if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef,
159 &op_class))
160 return;
161
162 pos = skb_put(skb, 4);
163 *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
164 *pos++ = 2; /* len */
165
166 *pos++ = op_class;
167 *pos++ = op_class; /* give current operating class as alternate too */
168 }
169
170 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
171 {
172 u8 *pos = (void *)skb_put(skb, 3);
173
174 *pos++ = WLAN_EID_BSS_COEX_2040;
175 *pos++ = 1; /* len */
176
177 *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
178 }
179
180 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
181 u16 status_code)
182 {
183 /* The capability will be 0 when sending a failure code */
184 if (status_code != 0)
185 return 0;
186
187 if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_2GHZ) {
188 return WLAN_CAPABILITY_SHORT_SLOT_TIME |
189 WLAN_CAPABILITY_SHORT_PREAMBLE;
190 }
191
192 return 0;
193 }
194
195 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
196 struct sk_buff *skb, const u8 *peer,
197 bool initiator)
198 {
199 struct ieee80211_tdls_lnkie *lnkid;
200 const u8 *init_addr, *rsp_addr;
201
202 if (initiator) {
203 init_addr = sdata->vif.addr;
204 rsp_addr = peer;
205 } else {
206 init_addr = peer;
207 rsp_addr = sdata->vif.addr;
208 }
209
210 lnkid = (void *)skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
211
212 lnkid->ie_type = WLAN_EID_LINK_ID;
213 lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
214
215 memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
216 memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
217 memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
218 }
219
220 static void
221 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
222 {
223 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
224 u8 *pos = (void *)skb_put(skb, 4);
225
226 *pos++ = WLAN_EID_AID;
227 *pos++ = 2; /* len */
228 put_unaligned_le16(ifmgd->aid, pos);
229 }
230
231 /* translate numbering in the WMM parameter IE to the mac80211 notation */
232 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
233 {
234 switch (ac) {
235 default:
236 WARN_ON_ONCE(1);
237 case 0:
238 return IEEE80211_AC_BE;
239 case 1:
240 return IEEE80211_AC_BK;
241 case 2:
242 return IEEE80211_AC_VI;
243 case 3:
244 return IEEE80211_AC_VO;
245 }
246 }
247
248 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
249 {
250 u8 ret;
251
252 ret = aifsn & 0x0f;
253 if (acm)
254 ret |= 0x10;
255 ret |= (aci << 5) & 0x60;
256 return ret;
257 }
258
259 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
260 {
261 return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
262 ((ilog2(cw_max + 1) << 0x4) & 0xf0);
263 }
264
265 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
266 struct sk_buff *skb)
267 {
268 struct ieee80211_wmm_param_ie *wmm;
269 struct ieee80211_tx_queue_params *txq;
270 int i;
271
272 wmm = (void *)skb_put(skb, sizeof(*wmm));
273 memset(wmm, 0, sizeof(*wmm));
274
275 wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
276 wmm->len = sizeof(*wmm) - 2;
277
278 wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
279 wmm->oui[1] = 0x50;
280 wmm->oui[2] = 0xf2;
281 wmm->oui_type = 2; /* WME */
282 wmm->oui_subtype = 1; /* WME param */
283 wmm->version = 1; /* WME ver */
284 wmm->qos_info = 0; /* U-APSD not in use */
285
286 /*
287 * Use the EDCA parameters defined for the BSS, or default if the AP
288 * doesn't support it, as mandated by 802.11-2012 section 10.22.4
289 */
290 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
291 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
292 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
293 txq->acm, i);
294 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
295 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
296 }
297 }
298
299 static void
300 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
301 struct sta_info *sta)
302 {
303 /* IEEE802.11ac-2013 Table E-4 */
304 u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
305 struct cfg80211_chan_def uc = sta->tdls_chandef;
306 enum nl80211_chan_width max_width = ieee80211_sta_cap_chan_bw(sta);
307 int i;
308
309 /* only support upgrading non-narrow channels up to 80Mhz */
310 if (max_width == NL80211_CHAN_WIDTH_5 ||
311 max_width == NL80211_CHAN_WIDTH_10)
312 return;
313
314 if (max_width > NL80211_CHAN_WIDTH_80)
315 max_width = NL80211_CHAN_WIDTH_80;
316
317 if (uc.width >= max_width)
318 return;
319 /*
320 * Channel usage constrains in the IEEE802.11ac-2013 specification only
321 * allow expanding a 20MHz channel to 80MHz in a single way. In
322 * addition, there are no 40MHz allowed channels that are not part of
323 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
324 */
325 for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
326 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
327 uc.center_freq1 = centers_80mhz[i];
328 uc.center_freq2 = 0;
329 uc.width = NL80211_CHAN_WIDTH_80;
330 break;
331 }
332
333 if (!uc.center_freq1)
334 return;
335
336 /* proceed to downgrade the chandef until usable or the same */
337 while (uc.width > max_width ||
338 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
339 sdata->wdev.iftype))
340 ieee80211_chandef_downgrade(&uc);
341
342 if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
343 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
344 sta->tdls_chandef.width, uc.width);
345
346 /*
347 * the station is not yet authorized when BW upgrade is done,
348 * locking is not required
349 */
350 sta->tdls_chandef = uc;
351 }
352 }
353
354 static void
355 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
356 struct sk_buff *skb, const u8 *peer,
357 u8 action_code, bool initiator,
358 const u8 *extra_ies, size_t extra_ies_len)
359 {
360 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
361 struct ieee80211_local *local = sdata->local;
362 struct ieee80211_supported_band *sband;
363 struct ieee80211_sta_ht_cap ht_cap;
364 struct ieee80211_sta_vht_cap vht_cap;
365 struct sta_info *sta = NULL;
366 size_t offset = 0, noffset;
367 u8 *pos;
368
369 ieee80211_add_srates_ie(sdata, skb, false, band);
370 ieee80211_add_ext_srates_ie(sdata, skb, false, band);
371 ieee80211_tdls_add_supp_channels(sdata, skb);
372
373 /* add any custom IEs that go before Extended Capabilities */
374 if (extra_ies_len) {
375 static const u8 before_ext_cap[] = {
376 WLAN_EID_SUPP_RATES,
377 WLAN_EID_COUNTRY,
378 WLAN_EID_EXT_SUPP_RATES,
379 WLAN_EID_SUPPORTED_CHANNELS,
380 WLAN_EID_RSN,
381 };
382 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
383 before_ext_cap,
384 ARRAY_SIZE(before_ext_cap),
385 offset);
386 pos = skb_put(skb, noffset - offset);
387 memcpy(pos, extra_ies + offset, noffset - offset);
388 offset = noffset;
389 }
390
391 ieee80211_tdls_add_ext_capab(sdata, skb);
392
393 /* add the QoS element if we support it */
394 if (local->hw.queues >= IEEE80211_NUM_ACS &&
395 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
396 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
397
398 /* add any custom IEs that go before HT capabilities */
399 if (extra_ies_len) {
400 static const u8 before_ht_cap[] = {
401 WLAN_EID_SUPP_RATES,
402 WLAN_EID_COUNTRY,
403 WLAN_EID_EXT_SUPP_RATES,
404 WLAN_EID_SUPPORTED_CHANNELS,
405 WLAN_EID_RSN,
406 WLAN_EID_EXT_CAPABILITY,
407 WLAN_EID_QOS_CAPA,
408 WLAN_EID_FAST_BSS_TRANSITION,
409 WLAN_EID_TIMEOUT_INTERVAL,
410 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
411 };
412 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
413 before_ht_cap,
414 ARRAY_SIZE(before_ht_cap),
415 offset);
416 pos = skb_put(skb, noffset - offset);
417 memcpy(pos, extra_ies + offset, noffset - offset);
418 offset = noffset;
419 }
420
421 mutex_lock(&local->sta_mtx);
422
423 /* we should have the peer STA if we're already responding */
424 if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
425 sta = sta_info_get(sdata, peer);
426 if (WARN_ON_ONCE(!sta)) {
427 mutex_unlock(&local->sta_mtx);
428 return;
429 }
430
431 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
432 }
433
434 ieee80211_tdls_add_oper_classes(sdata, skb);
435
436 /*
437 * with TDLS we can switch channels, and HT-caps are not necessarily
438 * the same on all bands. The specification limits the setup to a
439 * single HT-cap, so use the current band for now.
440 */
441 sband = local->hw.wiphy->bands[band];
442 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
443
444 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
445 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
446 ht_cap.ht_supported) {
447 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
448
449 /* disable SMPS in TDLS initiator */
450 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
451 << IEEE80211_HT_CAP_SM_PS_SHIFT;
452
453 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
454 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
455 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
456 ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
457 /* the peer caps are already intersected with our own */
458 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
459
460 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
461 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
462 }
463
464 if (ht_cap.ht_supported &&
465 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
466 ieee80211_tdls_add_bss_coex_ie(skb);
467
468 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
469
470 /* add any custom IEs that go before VHT capabilities */
471 if (extra_ies_len) {
472 static const u8 before_vht_cap[] = {
473 WLAN_EID_SUPP_RATES,
474 WLAN_EID_COUNTRY,
475 WLAN_EID_EXT_SUPP_RATES,
476 WLAN_EID_SUPPORTED_CHANNELS,
477 WLAN_EID_RSN,
478 WLAN_EID_EXT_CAPABILITY,
479 WLAN_EID_QOS_CAPA,
480 WLAN_EID_FAST_BSS_TRANSITION,
481 WLAN_EID_TIMEOUT_INTERVAL,
482 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
483 WLAN_EID_MULTI_BAND,
484 };
485 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
486 before_vht_cap,
487 ARRAY_SIZE(before_vht_cap),
488 offset);
489 pos = skb_put(skb, noffset - offset);
490 memcpy(pos, extra_ies + offset, noffset - offset);
491 offset = noffset;
492 }
493
494 /* build the VHT-cap similarly to the HT-cap */
495 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
496 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
497 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
498 vht_cap.vht_supported) {
499 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
500
501 /* the AID is present only when VHT is implemented */
502 if (action_code == WLAN_TDLS_SETUP_REQUEST)
503 ieee80211_tdls_add_aid(sdata, skb);
504
505 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
506 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
507 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
508 vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
509 /* the peer caps are already intersected with our own */
510 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
511
512 /* the AID is present only when VHT is implemented */
513 ieee80211_tdls_add_aid(sdata, skb);
514
515 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
516 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
517
518 /*
519 * if both peers support WIDER_BW, we can expand the chandef to
520 * a wider compatible one, up to 80MHz
521 */
522 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
523 ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
524 }
525
526 mutex_unlock(&local->sta_mtx);
527
528 /* add any remaining IEs */
529 if (extra_ies_len) {
530 noffset = extra_ies_len;
531 pos = skb_put(skb, noffset - offset);
532 memcpy(pos, extra_ies + offset, noffset - offset);
533 }
534
535 }
536
537 static void
538 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
539 struct sk_buff *skb, const u8 *peer,
540 bool initiator, const u8 *extra_ies,
541 size_t extra_ies_len)
542 {
543 struct ieee80211_local *local = sdata->local;
544 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
545 size_t offset = 0, noffset;
546 struct sta_info *sta, *ap_sta;
547 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
548 u8 *pos;
549
550 mutex_lock(&local->sta_mtx);
551
552 sta = sta_info_get(sdata, peer);
553 ap_sta = sta_info_get(sdata, ifmgd->bssid);
554 if (WARN_ON_ONCE(!sta || !ap_sta)) {
555 mutex_unlock(&local->sta_mtx);
556 return;
557 }
558
559 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
560
561 /* add any custom IEs that go before the QoS IE */
562 if (extra_ies_len) {
563 static const u8 before_qos[] = {
564 WLAN_EID_RSN,
565 };
566 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
567 before_qos,
568 ARRAY_SIZE(before_qos),
569 offset);
570 pos = skb_put(skb, noffset - offset);
571 memcpy(pos, extra_ies + offset, noffset - offset);
572 offset = noffset;
573 }
574
575 /* add the QoS param IE if both the peer and we support it */
576 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
577 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
578
579 /* add any custom IEs that go before HT operation */
580 if (extra_ies_len) {
581 static const u8 before_ht_op[] = {
582 WLAN_EID_RSN,
583 WLAN_EID_QOS_CAPA,
584 WLAN_EID_FAST_BSS_TRANSITION,
585 WLAN_EID_TIMEOUT_INTERVAL,
586 };
587 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
588 before_ht_op,
589 ARRAY_SIZE(before_ht_op),
590 offset);
591 pos = skb_put(skb, noffset - offset);
592 memcpy(pos, extra_ies + offset, noffset - offset);
593 offset = noffset;
594 }
595
596 /*
597 * if HT support is only added in TDLS, we need an HT-operation IE.
598 * add the IE as required by IEEE802.11-2012 9.23.3.2.
599 */
600 if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
601 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
602 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
603 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
604
605 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
606 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
607 &sdata->vif.bss_conf.chandef, prot,
608 true);
609 }
610
611 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
612
613 /* only include VHT-operation if not on the 2.4GHz band */
614 if (band != IEEE80211_BAND_2GHZ && sta->sta.vht_cap.vht_supported) {
615 /*
616 * if both peers support WIDER_BW, we can expand the chandef to
617 * a wider compatible one, up to 80MHz
618 */
619 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
620 ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
621
622 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
623 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
624 &sta->tdls_chandef);
625 }
626
627 mutex_unlock(&local->sta_mtx);
628
629 /* add any remaining IEs */
630 if (extra_ies_len) {
631 noffset = extra_ies_len;
632 pos = skb_put(skb, noffset - offset);
633 memcpy(pos, extra_ies + offset, noffset - offset);
634 }
635 }
636
637 static void
638 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
639 struct sk_buff *skb, const u8 *peer,
640 bool initiator, const u8 *extra_ies,
641 size_t extra_ies_len, u8 oper_class,
642 struct cfg80211_chan_def *chandef)
643 {
644 struct ieee80211_tdls_data *tf;
645 size_t offset = 0, noffset;
646 u8 *pos;
647
648 if (WARN_ON_ONCE(!chandef))
649 return;
650
651 tf = (void *)skb->data;
652 tf->u.chan_switch_req.target_channel =
653 ieee80211_frequency_to_channel(chandef->chan->center_freq);
654 tf->u.chan_switch_req.oper_class = oper_class;
655
656 if (extra_ies_len) {
657 static const u8 before_lnkie[] = {
658 WLAN_EID_SECONDARY_CHANNEL_OFFSET,
659 };
660 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
661 before_lnkie,
662 ARRAY_SIZE(before_lnkie),
663 offset);
664 pos = skb_put(skb, noffset - offset);
665 memcpy(pos, extra_ies + offset, noffset - offset);
666 offset = noffset;
667 }
668
669 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
670
671 /* add any remaining IEs */
672 if (extra_ies_len) {
673 noffset = extra_ies_len;
674 pos = skb_put(skb, noffset - offset);
675 memcpy(pos, extra_ies + offset, noffset - offset);
676 }
677 }
678
679 static void
680 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
681 struct sk_buff *skb, const u8 *peer,
682 u16 status_code, bool initiator,
683 const u8 *extra_ies,
684 size_t extra_ies_len)
685 {
686 if (status_code == 0)
687 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
688
689 if (extra_ies_len)
690 memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
691 }
692
693 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
694 struct sk_buff *skb, const u8 *peer,
695 u8 action_code, u16 status_code,
696 bool initiator, const u8 *extra_ies,
697 size_t extra_ies_len, u8 oper_class,
698 struct cfg80211_chan_def *chandef)
699 {
700 switch (action_code) {
701 case WLAN_TDLS_SETUP_REQUEST:
702 case WLAN_TDLS_SETUP_RESPONSE:
703 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
704 if (status_code == 0)
705 ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
706 action_code,
707 initiator,
708 extra_ies,
709 extra_ies_len);
710 break;
711 case WLAN_TDLS_SETUP_CONFIRM:
712 if (status_code == 0)
713 ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
714 initiator, extra_ies,
715 extra_ies_len);
716 break;
717 case WLAN_TDLS_TEARDOWN:
718 case WLAN_TDLS_DISCOVERY_REQUEST:
719 if (extra_ies_len)
720 memcpy(skb_put(skb, extra_ies_len), extra_ies,
721 extra_ies_len);
722 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
723 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
724 break;
725 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
726 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
727 initiator, extra_ies,
728 extra_ies_len,
729 oper_class, chandef);
730 break;
731 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
732 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
733 status_code,
734 initiator, extra_ies,
735 extra_ies_len);
736 break;
737 }
738
739 }
740
741 static int
742 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
743 const u8 *peer, u8 action_code, u8 dialog_token,
744 u16 status_code, struct sk_buff *skb)
745 {
746 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
747 struct ieee80211_tdls_data *tf;
748
749 tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
750
751 memcpy(tf->da, peer, ETH_ALEN);
752 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
753 tf->ether_type = cpu_to_be16(ETH_P_TDLS);
754 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
755
756 /* network header is after the ethernet header */
757 skb_set_network_header(skb, ETH_HLEN);
758
759 switch (action_code) {
760 case WLAN_TDLS_SETUP_REQUEST:
761 tf->category = WLAN_CATEGORY_TDLS;
762 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
763
764 skb_put(skb, sizeof(tf->u.setup_req));
765 tf->u.setup_req.dialog_token = dialog_token;
766 tf->u.setup_req.capability =
767 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
768 status_code));
769 break;
770 case WLAN_TDLS_SETUP_RESPONSE:
771 tf->category = WLAN_CATEGORY_TDLS;
772 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
773
774 skb_put(skb, sizeof(tf->u.setup_resp));
775 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
776 tf->u.setup_resp.dialog_token = dialog_token;
777 tf->u.setup_resp.capability =
778 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
779 status_code));
780 break;
781 case WLAN_TDLS_SETUP_CONFIRM:
782 tf->category = WLAN_CATEGORY_TDLS;
783 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
784
785 skb_put(skb, sizeof(tf->u.setup_cfm));
786 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
787 tf->u.setup_cfm.dialog_token = dialog_token;
788 break;
789 case WLAN_TDLS_TEARDOWN:
790 tf->category = WLAN_CATEGORY_TDLS;
791 tf->action_code = WLAN_TDLS_TEARDOWN;
792
793 skb_put(skb, sizeof(tf->u.teardown));
794 tf->u.teardown.reason_code = cpu_to_le16(status_code);
795 break;
796 case WLAN_TDLS_DISCOVERY_REQUEST:
797 tf->category = WLAN_CATEGORY_TDLS;
798 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
799
800 skb_put(skb, sizeof(tf->u.discover_req));
801 tf->u.discover_req.dialog_token = dialog_token;
802 break;
803 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
804 tf->category = WLAN_CATEGORY_TDLS;
805 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
806
807 skb_put(skb, sizeof(tf->u.chan_switch_req));
808 break;
809 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
810 tf->category = WLAN_CATEGORY_TDLS;
811 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
812
813 skb_put(skb, sizeof(tf->u.chan_switch_resp));
814 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
815 break;
816 default:
817 return -EINVAL;
818 }
819
820 return 0;
821 }
822
823 static int
824 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
825 const u8 *peer, u8 action_code, u8 dialog_token,
826 u16 status_code, struct sk_buff *skb)
827 {
828 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
829 struct ieee80211_mgmt *mgmt;
830
831 mgmt = (void *)skb_put(skb, 24);
832 memset(mgmt, 0, 24);
833 memcpy(mgmt->da, peer, ETH_ALEN);
834 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
835 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
836
837 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
838 IEEE80211_STYPE_ACTION);
839
840 switch (action_code) {
841 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
842 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
843 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
844 mgmt->u.action.u.tdls_discover_resp.action_code =
845 WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
846 mgmt->u.action.u.tdls_discover_resp.dialog_token =
847 dialog_token;
848 mgmt->u.action.u.tdls_discover_resp.capability =
849 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
850 status_code));
851 break;
852 default:
853 return -EINVAL;
854 }
855
856 return 0;
857 }
858
859 static struct sk_buff *
860 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
861 const u8 *peer, u8 action_code,
862 u8 dialog_token, u16 status_code,
863 bool initiator, const u8 *extra_ies,
864 size_t extra_ies_len, u8 oper_class,
865 struct cfg80211_chan_def *chandef)
866 {
867 struct ieee80211_local *local = sdata->local;
868 struct sk_buff *skb;
869 int ret;
870
871 skb = netdev_alloc_skb(sdata->dev,
872 local->hw.extra_tx_headroom +
873 max(sizeof(struct ieee80211_mgmt),
874 sizeof(struct ieee80211_tdls_data)) +
875 50 + /* supported rates */
876 10 + /* ext capab */
877 26 + /* max(WMM-info, WMM-param) */
878 2 + max(sizeof(struct ieee80211_ht_cap),
879 sizeof(struct ieee80211_ht_operation)) +
880 2 + max(sizeof(struct ieee80211_vht_cap),
881 sizeof(struct ieee80211_vht_operation)) +
882 50 + /* supported channels */
883 3 + /* 40/20 BSS coex */
884 4 + /* AID */
885 4 + /* oper classes */
886 extra_ies_len +
887 sizeof(struct ieee80211_tdls_lnkie));
888 if (!skb)
889 return NULL;
890
891 skb_reserve(skb, local->hw.extra_tx_headroom);
892
893 switch (action_code) {
894 case WLAN_TDLS_SETUP_REQUEST:
895 case WLAN_TDLS_SETUP_RESPONSE:
896 case WLAN_TDLS_SETUP_CONFIRM:
897 case WLAN_TDLS_TEARDOWN:
898 case WLAN_TDLS_DISCOVERY_REQUEST:
899 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
900 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
901 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
902 sdata->dev, peer,
903 action_code, dialog_token,
904 status_code, skb);
905 break;
906 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
907 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
908 peer, action_code,
909 dialog_token, status_code,
910 skb);
911 break;
912 default:
913 ret = -ENOTSUPP;
914 break;
915 }
916
917 if (ret < 0)
918 goto fail;
919
920 ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
921 initiator, extra_ies, extra_ies_len, oper_class,
922 chandef);
923 return skb;
924
925 fail:
926 dev_kfree_skb(skb);
927 return NULL;
928 }
929
930 static int
931 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
932 const u8 *peer, u8 action_code, u8 dialog_token,
933 u16 status_code, u32 peer_capability,
934 bool initiator, const u8 *extra_ies,
935 size_t extra_ies_len, u8 oper_class,
936 struct cfg80211_chan_def *chandef)
937 {
938 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
939 struct sk_buff *skb = NULL;
940 struct sta_info *sta;
941 u32 flags = 0;
942 int ret = 0;
943
944 rcu_read_lock();
945 sta = sta_info_get(sdata, peer);
946
947 /* infer the initiator if we can, to support old userspace */
948 switch (action_code) {
949 case WLAN_TDLS_SETUP_REQUEST:
950 if (sta) {
951 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
952 sta->sta.tdls_initiator = false;
953 }
954 /* fall-through */
955 case WLAN_TDLS_SETUP_CONFIRM:
956 case WLAN_TDLS_DISCOVERY_REQUEST:
957 initiator = true;
958 break;
959 case WLAN_TDLS_SETUP_RESPONSE:
960 /*
961 * In some testing scenarios, we send a request and response.
962 * Make the last packet sent take effect for the initiator
963 * value.
964 */
965 if (sta) {
966 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
967 sta->sta.tdls_initiator = true;
968 }
969 /* fall-through */
970 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
971 initiator = false;
972 break;
973 case WLAN_TDLS_TEARDOWN:
974 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
975 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
976 /* any value is ok */
977 break;
978 default:
979 ret = -ENOTSUPP;
980 break;
981 }
982
983 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
984 initiator = true;
985
986 rcu_read_unlock();
987 if (ret < 0)
988 goto fail;
989
990 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
991 dialog_token, status_code,
992 initiator, extra_ies,
993 extra_ies_len, oper_class,
994 chandef);
995 if (!skb) {
996 ret = -EINVAL;
997 goto fail;
998 }
999
1000 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
1001 ieee80211_tx_skb(sdata, skb);
1002 return 0;
1003 }
1004
1005 /*
1006 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1007 * we should default to AC_VI.
1008 */
1009 switch (action_code) {
1010 case WLAN_TDLS_SETUP_REQUEST:
1011 case WLAN_TDLS_SETUP_RESPONSE:
1012 skb_set_queue_mapping(skb, IEEE80211_AC_BK);
1013 skb->priority = 2;
1014 break;
1015 default:
1016 skb_set_queue_mapping(skb, IEEE80211_AC_VI);
1017 skb->priority = 5;
1018 break;
1019 }
1020
1021 /*
1022 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1023 * Later, if no ACK is returned from peer, we will re-send the teardown
1024 * packet through the AP.
1025 */
1026 if ((action_code == WLAN_TDLS_TEARDOWN) &&
1027 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1028 bool try_resend; /* Should we keep skb for possible resend */
1029
1030 /* If not sending directly to peer - no point in keeping skb */
1031 rcu_read_lock();
1032 sta = sta_info_get(sdata, peer);
1033 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1034 rcu_read_unlock();
1035
1036 spin_lock_bh(&sdata->u.mgd.teardown_lock);
1037 if (try_resend && !sdata->u.mgd.teardown_skb) {
1038 /* Mark it as requiring TX status callback */
1039 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1040 IEEE80211_TX_INTFL_MLME_CONN_TX;
1041
1042 /*
1043 * skb is copied since mac80211 will later set
1044 * properties that might not be the same as the AP,
1045 * such as encryption, QoS, addresses, etc.
1046 *
1047 * No problem if skb_copy() fails, so no need to check.
1048 */
1049 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1050 sdata->u.mgd.orig_teardown_skb = skb;
1051 }
1052 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1053 }
1054
1055 /* disable bottom halves when entering the Tx path */
1056 local_bh_disable();
1057 __ieee80211_subif_start_xmit(skb, dev, flags);
1058 local_bh_enable();
1059
1060 return ret;
1061
1062 fail:
1063 dev_kfree_skb(skb);
1064 return ret;
1065 }
1066
1067 static int
1068 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1069 const u8 *peer, u8 action_code, u8 dialog_token,
1070 u16 status_code, u32 peer_capability, bool initiator,
1071 const u8 *extra_ies, size_t extra_ies_len)
1072 {
1073 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1074 struct ieee80211_local *local = sdata->local;
1075 enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode;
1076 int ret;
1077
1078 /* don't support setup with forced SMPS mode that's not off */
1079 if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1080 smps_mode != IEEE80211_SMPS_OFF) {
1081 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1082 smps_mode);
1083 return -ENOTSUPP;
1084 }
1085
1086 mutex_lock(&local->mtx);
1087
1088 /* we don't support concurrent TDLS peer setups */
1089 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1090 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1091 ret = -EBUSY;
1092 goto out_unlock;
1093 }
1094
1095 /*
1096 * make sure we have a STA representing the peer so we drop or buffer
1097 * non-TDLS-setup frames to the peer. We can't send other packets
1098 * during setup through the AP path.
1099 * Allow error packets to be sent - sometimes we don't even add a STA
1100 * before failing the setup.
1101 */
1102 if (status_code == 0) {
1103 rcu_read_lock();
1104 if (!sta_info_get(sdata, peer)) {
1105 rcu_read_unlock();
1106 ret = -ENOLINK;
1107 goto out_unlock;
1108 }
1109 rcu_read_unlock();
1110 }
1111
1112 ieee80211_flush_queues(local, sdata, false);
1113 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1114 mutex_unlock(&local->mtx);
1115
1116 /* we cannot take the mutex while preparing the setup packet */
1117 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1118 dialog_token, status_code,
1119 peer_capability, initiator,
1120 extra_ies, extra_ies_len, 0,
1121 NULL);
1122 if (ret < 0) {
1123 mutex_lock(&local->mtx);
1124 eth_zero_addr(sdata->u.mgd.tdls_peer);
1125 mutex_unlock(&local->mtx);
1126 return ret;
1127 }
1128
1129 ieee80211_queue_delayed_work(&sdata->local->hw,
1130 &sdata->u.mgd.tdls_peer_del_work,
1131 TDLS_PEER_SETUP_TIMEOUT);
1132 return 0;
1133
1134 out_unlock:
1135 mutex_unlock(&local->mtx);
1136 return ret;
1137 }
1138
1139 static int
1140 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1141 const u8 *peer, u8 action_code, u8 dialog_token,
1142 u16 status_code, u32 peer_capability,
1143 bool initiator, const u8 *extra_ies,
1144 size_t extra_ies_len)
1145 {
1146 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1147 struct ieee80211_local *local = sdata->local;
1148 struct sta_info *sta;
1149 int ret;
1150
1151 /*
1152 * No packets can be transmitted to the peer via the AP during setup -
1153 * the STA is set as a TDLS peer, but is not authorized.
1154 * During teardown, we prevent direct transmissions by stopping the
1155 * queues and flushing all direct packets.
1156 */
1157 ieee80211_stop_vif_queues(local, sdata,
1158 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1159 ieee80211_flush_queues(local, sdata, false);
1160
1161 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1162 dialog_token, status_code,
1163 peer_capability, initiator,
1164 extra_ies, extra_ies_len, 0,
1165 NULL);
1166 if (ret < 0)
1167 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1168 ret);
1169
1170 /*
1171 * Remove the STA AUTH flag to force further traffic through the AP. If
1172 * the STA was unreachable, it was already removed.
1173 */
1174 rcu_read_lock();
1175 sta = sta_info_get(sdata, peer);
1176 if (sta)
1177 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1178 rcu_read_unlock();
1179
1180 ieee80211_wake_vif_queues(local, sdata,
1181 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1182
1183 return 0;
1184 }
1185
1186 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1187 const u8 *peer, u8 action_code, u8 dialog_token,
1188 u16 status_code, u32 peer_capability,
1189 bool initiator, const u8 *extra_ies,
1190 size_t extra_ies_len)
1191 {
1192 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1193 int ret;
1194
1195 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1196 return -ENOTSUPP;
1197
1198 /* make sure we are in managed mode, and associated */
1199 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1200 !sdata->u.mgd.associated)
1201 return -EINVAL;
1202
1203 switch (action_code) {
1204 case WLAN_TDLS_SETUP_REQUEST:
1205 case WLAN_TDLS_SETUP_RESPONSE:
1206 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1207 dialog_token, status_code,
1208 peer_capability, initiator,
1209 extra_ies, extra_ies_len);
1210 break;
1211 case WLAN_TDLS_TEARDOWN:
1212 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1213 action_code, dialog_token,
1214 status_code,
1215 peer_capability, initiator,
1216 extra_ies, extra_ies_len);
1217 break;
1218 case WLAN_TDLS_DISCOVERY_REQUEST:
1219 /*
1220 * Protect the discovery so we can hear the TDLS discovery
1221 * response frame. It is transmitted directly and not buffered
1222 * by the AP.
1223 */
1224 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1225 /* fall-through */
1226 case WLAN_TDLS_SETUP_CONFIRM:
1227 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1228 /* no special handling */
1229 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1230 action_code,
1231 dialog_token,
1232 status_code,
1233 peer_capability,
1234 initiator, extra_ies,
1235 extra_ies_len, 0, NULL);
1236 break;
1237 default:
1238 ret = -EOPNOTSUPP;
1239 break;
1240 }
1241
1242 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1243 action_code, peer, ret);
1244 return ret;
1245 }
1246
1247 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1248 struct sta_info *sta)
1249 {
1250 struct ieee80211_local *local = sdata->local;
1251 struct ieee80211_chanctx_conf *conf;
1252 struct ieee80211_chanctx *ctx;
1253 enum nl80211_chan_width width;
1254 struct ieee80211_supported_band *sband;
1255
1256 mutex_lock(&local->chanctx_mtx);
1257 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1258 lockdep_is_held(&local->chanctx_mtx));
1259 if (conf) {
1260 width = conf->def.width;
1261 sband = local->hw.wiphy->bands[conf->def.chan->band];
1262 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1263 ieee80211_recalc_chanctx_chantype(local, ctx);
1264
1265 /* if width changed and a peer is given, update its BW */
1266 if (width != conf->def.width && sta &&
1267 test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1268 enum ieee80211_sta_rx_bandwidth bw;
1269
1270 bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1271 bw = min(bw, ieee80211_sta_cap_rx_bw(sta));
1272 if (bw != sta->sta.bandwidth) {
1273 sta->sta.bandwidth = bw;
1274 rate_control_rate_update(local, sband, sta,
1275 IEEE80211_RC_BW_CHANGED);
1276 /*
1277 * if a TDLS peer BW was updated, we need to
1278 * recalc the chandef width again, to get the
1279 * correct chanctx min_def
1280 */
1281 ieee80211_recalc_chanctx_chantype(local, ctx);
1282 }
1283 }
1284
1285 }
1286 mutex_unlock(&local->chanctx_mtx);
1287 }
1288
1289 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1290 {
1291 struct sta_info *sta;
1292 bool result = false;
1293
1294 rcu_read_lock();
1295 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1296 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1297 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1298 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1299 !sta->sta.ht_cap.ht_supported)
1300 continue;
1301 result = true;
1302 break;
1303 }
1304 rcu_read_unlock();
1305
1306 return result;
1307 }
1308
1309 static void
1310 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1311 struct sta_info *sta)
1312 {
1313 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1314 bool tdls_ht;
1315 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1316 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1317 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1318 u16 opmode;
1319
1320 /* Nothing to do if the BSS connection uses HT */
1321 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
1322 return;
1323
1324 tdls_ht = (sta && sta->sta.ht_cap.ht_supported) ||
1325 iee80211_tdls_have_ht_peers(sdata);
1326
1327 opmode = sdata->vif.bss_conf.ht_operation_mode;
1328
1329 if (tdls_ht)
1330 opmode |= protection;
1331 else
1332 opmode &= ~protection;
1333
1334 if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1335 return;
1336
1337 sdata->vif.bss_conf.ht_operation_mode = opmode;
1338 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT);
1339 }
1340
1341 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1342 const u8 *peer, enum nl80211_tdls_operation oper)
1343 {
1344 struct sta_info *sta;
1345 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1346 struct ieee80211_local *local = sdata->local;
1347 int ret;
1348
1349 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1350 return -ENOTSUPP;
1351
1352 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1353 return -EINVAL;
1354
1355 switch (oper) {
1356 case NL80211_TDLS_ENABLE_LINK:
1357 case NL80211_TDLS_DISABLE_LINK:
1358 break;
1359 case NL80211_TDLS_TEARDOWN:
1360 case NL80211_TDLS_SETUP:
1361 case NL80211_TDLS_DISCOVERY_REQ:
1362 /* We don't support in-driver setup/teardown/discovery */
1363 return -ENOTSUPP;
1364 }
1365
1366 /* protect possible bss_conf changes and avoid concurrency in
1367 * ieee80211_bss_info_change_notify()
1368 */
1369 sdata_lock(sdata);
1370 mutex_lock(&local->mtx);
1371 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1372
1373 switch (oper) {
1374 case NL80211_TDLS_ENABLE_LINK:
1375 if (sdata->vif.csa_active) {
1376 tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1377 ret = -EBUSY;
1378 break;
1379 }
1380
1381 mutex_lock(&local->sta_mtx);
1382 sta = sta_info_get(sdata, peer);
1383 if (!sta) {
1384 mutex_unlock(&local->sta_mtx);
1385 ret = -ENOLINK;
1386 break;
1387 }
1388
1389 iee80211_tdls_recalc_chanctx(sdata, sta);
1390 iee80211_tdls_recalc_ht_protection(sdata, sta);
1391
1392 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1393 mutex_unlock(&local->sta_mtx);
1394
1395 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1396 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1397 ret = 0;
1398 break;
1399 case NL80211_TDLS_DISABLE_LINK:
1400 /*
1401 * The teardown message in ieee80211_tdls_mgmt_teardown() was
1402 * created while the queues were stopped, so it might still be
1403 * pending. Before flushing the queues we need to be sure the
1404 * message is handled by the tasklet handling pending messages,
1405 * otherwise we might start destroying the station before
1406 * sending the teardown packet.
1407 * Note that this only forces the tasklet to flush pendings -
1408 * not to stop the tasklet from rescheduling itself.
1409 */
1410 tasklet_kill(&local->tx_pending_tasklet);
1411 /* flush a potentially queued teardown packet */
1412 ieee80211_flush_queues(local, sdata, false);
1413
1414 ret = sta_info_destroy_addr(sdata, peer);
1415
1416 mutex_lock(&local->sta_mtx);
1417 iee80211_tdls_recalc_ht_protection(sdata, NULL);
1418 mutex_unlock(&local->sta_mtx);
1419
1420 iee80211_tdls_recalc_chanctx(sdata, NULL);
1421 break;
1422 default:
1423 ret = -ENOTSUPP;
1424 break;
1425 }
1426
1427 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1428 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1429 eth_zero_addr(sdata->u.mgd.tdls_peer);
1430 }
1431
1432 if (ret == 0)
1433 ieee80211_queue_work(&sdata->local->hw,
1434 &sdata->u.mgd.request_smps_work);
1435
1436 mutex_unlock(&local->mtx);
1437 sdata_unlock(sdata);
1438 return ret;
1439 }
1440
1441 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1442 enum nl80211_tdls_operation oper,
1443 u16 reason_code, gfp_t gfp)
1444 {
1445 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1446
1447 if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1448 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1449 oper);
1450 return;
1451 }
1452
1453 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1454 }
1455 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1456
1457 static void
1458 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1459 {
1460 struct ieee80211_ch_switch_timing *ch_sw;
1461
1462 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1463 *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1464
1465 ch_sw = (void *)buf;
1466 ch_sw->switch_time = cpu_to_le16(switch_time);
1467 ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1468 }
1469
1470 /* find switch timing IE in SKB ready for Tx */
1471 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1472 {
1473 struct ieee80211_tdls_data *tf;
1474 const u8 *ie_start;
1475
1476 /*
1477 * Get the offset for the new location of the switch timing IE.
1478 * The SKB network header will now point to the "payload_type"
1479 * element of the TDLS data frame struct.
1480 */
1481 tf = container_of(skb->data + skb_network_offset(skb),
1482 struct ieee80211_tdls_data, payload_type);
1483 ie_start = tf->u.chan_switch_req.variable;
1484 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1485 skb->len - (ie_start - skb->data));
1486 }
1487
1488 static struct sk_buff *
1489 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1490 struct cfg80211_chan_def *chandef,
1491 u32 *ch_sw_tm_ie_offset)
1492 {
1493 struct ieee80211_sub_if_data *sdata = sta->sdata;
1494 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1495 2 + sizeof(struct ieee80211_ch_switch_timing)];
1496 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1497 u8 *pos = extra_ies;
1498 struct sk_buff *skb;
1499
1500 /*
1501 * if chandef points to a wide channel add a Secondary-Channel
1502 * Offset information element
1503 */
1504 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1505 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1506 bool ht40plus;
1507
1508 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1509 *pos++ = sizeof(*sec_chan_ie);
1510 sec_chan_ie = (void *)pos;
1511
1512 ht40plus = cfg80211_get_chandef_type(chandef) ==
1513 NL80211_CHAN_HT40PLUS;
1514 sec_chan_ie->sec_chan_offs = ht40plus ?
1515 IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1516 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1517 pos += sizeof(*sec_chan_ie);
1518
1519 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1520 }
1521
1522 /* just set the values to 0, this is a template */
1523 iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1524
1525 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1526 WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1527 0, 0, !sta->sta.tdls_initiator,
1528 extra_ies, extra_ies_len,
1529 oper_class, chandef);
1530 if (!skb)
1531 return NULL;
1532
1533 skb = ieee80211_build_data_template(sdata, skb, 0);
1534 if (IS_ERR(skb)) {
1535 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1536 return NULL;
1537 }
1538
1539 if (ch_sw_tm_ie_offset) {
1540 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1541
1542 if (!tm_ie) {
1543 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1544 dev_kfree_skb_any(skb);
1545 return NULL;
1546 }
1547
1548 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1549 }
1550
1551 tdls_dbg(sdata,
1552 "TDLS channel switch request template for %pM ch %d width %d\n",
1553 sta->sta.addr, chandef->chan->center_freq, chandef->width);
1554 return skb;
1555 }
1556
1557 int
1558 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1559 const u8 *addr, u8 oper_class,
1560 struct cfg80211_chan_def *chandef)
1561 {
1562 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1563 struct ieee80211_local *local = sdata->local;
1564 struct sta_info *sta;
1565 struct sk_buff *skb = NULL;
1566 u32 ch_sw_tm_ie;
1567 int ret;
1568
1569 mutex_lock(&local->sta_mtx);
1570 sta = sta_info_get(sdata, addr);
1571 if (!sta) {
1572 tdls_dbg(sdata,
1573 "Invalid TDLS peer %pM for channel switch request\n",
1574 addr);
1575 ret = -ENOENT;
1576 goto out;
1577 }
1578
1579 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1580 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1581 addr);
1582 ret = -ENOTSUPP;
1583 goto out;
1584 }
1585
1586 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1587 &ch_sw_tm_ie);
1588 if (!skb) {
1589 ret = -ENOENT;
1590 goto out;
1591 }
1592
1593 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1594 chandef, skb, ch_sw_tm_ie);
1595 if (!ret)
1596 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1597
1598 out:
1599 mutex_unlock(&local->sta_mtx);
1600 dev_kfree_skb_any(skb);
1601 return ret;
1602 }
1603
1604 void
1605 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1606 struct net_device *dev,
1607 const u8 *addr)
1608 {
1609 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1610 struct ieee80211_local *local = sdata->local;
1611 struct sta_info *sta;
1612
1613 mutex_lock(&local->sta_mtx);
1614 sta = sta_info_get(sdata, addr);
1615 if (!sta) {
1616 tdls_dbg(sdata,
1617 "Invalid TDLS peer %pM for channel switch cancel\n",
1618 addr);
1619 goto out;
1620 }
1621
1622 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1623 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1624 addr);
1625 goto out;
1626 }
1627
1628 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1629 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1630
1631 out:
1632 mutex_unlock(&local->sta_mtx);
1633 }
1634
1635 static struct sk_buff *
1636 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1637 u32 *ch_sw_tm_ie_offset)
1638 {
1639 struct ieee80211_sub_if_data *sdata = sta->sdata;
1640 struct sk_buff *skb;
1641 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1642
1643 /* initial timing are always zero in the template */
1644 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1645
1646 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1647 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1648 0, 0, !sta->sta.tdls_initiator,
1649 extra_ies, sizeof(extra_ies), 0, NULL);
1650 if (!skb)
1651 return NULL;
1652
1653 skb = ieee80211_build_data_template(sdata, skb, 0);
1654 if (IS_ERR(skb)) {
1655 tdls_dbg(sdata,
1656 "Failed building TDLS channel switch resp frame\n");
1657 return NULL;
1658 }
1659
1660 if (ch_sw_tm_ie_offset) {
1661 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1662
1663 if (!tm_ie) {
1664 tdls_dbg(sdata,
1665 "No switch timing IE in TDLS switch resp\n");
1666 dev_kfree_skb_any(skb);
1667 return NULL;
1668 }
1669
1670 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1671 }
1672
1673 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1674 sta->sta.addr);
1675 return skb;
1676 }
1677
1678 static int
1679 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1680 struct sk_buff *skb)
1681 {
1682 struct ieee80211_local *local = sdata->local;
1683 struct ieee802_11_elems elems;
1684 struct sta_info *sta;
1685 struct ieee80211_tdls_data *tf = (void *)skb->data;
1686 bool local_initiator;
1687 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1688 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1689 struct ieee80211_tdls_ch_sw_params params = {};
1690 int ret;
1691
1692 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1693 params.timestamp = rx_status->device_timestamp;
1694
1695 if (skb->len < baselen) {
1696 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1697 skb->len);
1698 return -EINVAL;
1699 }
1700
1701 mutex_lock(&local->sta_mtx);
1702 sta = sta_info_get(sdata, tf->sa);
1703 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1704 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1705 tf->sa);
1706 ret = -EINVAL;
1707 goto out;
1708 }
1709
1710 params.sta = &sta->sta;
1711 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1712 if (params.status != 0) {
1713 ret = 0;
1714 goto call_drv;
1715 }
1716
1717 ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1718 skb->len - baselen, false, &elems);
1719 if (elems.parse_error) {
1720 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1721 ret = -EINVAL;
1722 goto out;
1723 }
1724
1725 if (!elems.ch_sw_timing || !elems.lnk_id) {
1726 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1727 ret = -EINVAL;
1728 goto out;
1729 }
1730
1731 /* validate the initiator is set correctly */
1732 local_initiator =
1733 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1734 if (local_initiator == sta->sta.tdls_initiator) {
1735 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1736 ret = -EINVAL;
1737 goto out;
1738 }
1739
1740 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1741 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1742
1743 params.tmpl_skb =
1744 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1745 if (!params.tmpl_skb) {
1746 ret = -ENOENT;
1747 goto out;
1748 }
1749
1750 call_drv:
1751 drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1752
1753 tdls_dbg(sdata,
1754 "TDLS channel switch response received from %pM status %d\n",
1755 tf->sa, params.status);
1756
1757 out:
1758 mutex_unlock(&local->sta_mtx);
1759 dev_kfree_skb_any(params.tmpl_skb);
1760 return ret;
1761 }
1762
1763 static int
1764 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1765 struct sk_buff *skb)
1766 {
1767 struct ieee80211_local *local = sdata->local;
1768 struct ieee802_11_elems elems;
1769 struct cfg80211_chan_def chandef;
1770 struct ieee80211_channel *chan;
1771 enum nl80211_channel_type chan_type;
1772 int freq;
1773 u8 target_channel, oper_class;
1774 bool local_initiator;
1775 struct sta_info *sta;
1776 enum ieee80211_band band;
1777 struct ieee80211_tdls_data *tf = (void *)skb->data;
1778 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1779 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1780 struct ieee80211_tdls_ch_sw_params params = {};
1781 int ret = 0;
1782
1783 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1784 params.timestamp = rx_status->device_timestamp;
1785
1786 if (skb->len < baselen) {
1787 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1788 skb->len);
1789 return -EINVAL;
1790 }
1791
1792 target_channel = tf->u.chan_switch_req.target_channel;
1793 oper_class = tf->u.chan_switch_req.oper_class;
1794
1795 /*
1796 * We can't easily infer the channel band. The operating class is
1797 * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1798 * solution here is to treat channels with number >14 as 5GHz ones,
1799 * and specifically check for the (oper_class, channel) combinations
1800 * where this doesn't hold. These are thankfully unique according to
1801 * IEEE802.11-2012.
1802 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1803 * valid here.
1804 */
1805 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1806 oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1807 target_channel < 14)
1808 band = IEEE80211_BAND_5GHZ;
1809 else
1810 band = target_channel < 14 ? IEEE80211_BAND_2GHZ :
1811 IEEE80211_BAND_5GHZ;
1812
1813 freq = ieee80211_channel_to_frequency(target_channel, band);
1814 if (freq == 0) {
1815 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1816 target_channel);
1817 return -EINVAL;
1818 }
1819
1820 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1821 if (!chan) {
1822 tdls_dbg(sdata,
1823 "Unsupported channel for TDLS chan switch: %d\n",
1824 target_channel);
1825 return -EINVAL;
1826 }
1827
1828 ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1829 skb->len - baselen, false, &elems);
1830 if (elems.parse_error) {
1831 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1832 return -EINVAL;
1833 }
1834
1835 if (!elems.ch_sw_timing || !elems.lnk_id) {
1836 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1837 return -EINVAL;
1838 }
1839
1840 if (!elems.sec_chan_offs) {
1841 chan_type = NL80211_CHAN_HT20;
1842 } else {
1843 switch (elems.sec_chan_offs->sec_chan_offs) {
1844 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1845 chan_type = NL80211_CHAN_HT40PLUS;
1846 break;
1847 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1848 chan_type = NL80211_CHAN_HT40MINUS;
1849 break;
1850 default:
1851 chan_type = NL80211_CHAN_HT20;
1852 break;
1853 }
1854 }
1855
1856 cfg80211_chandef_create(&chandef, chan, chan_type);
1857
1858 /* we will be active on the TDLS link */
1859 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1860 sdata->wdev.iftype)) {
1861 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1862 return -EINVAL;
1863 }
1864
1865 mutex_lock(&local->sta_mtx);
1866 sta = sta_info_get(sdata, tf->sa);
1867 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1868 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1869 tf->sa);
1870 ret = -EINVAL;
1871 goto out;
1872 }
1873
1874 params.sta = &sta->sta;
1875
1876 /* validate the initiator is set correctly */
1877 local_initiator =
1878 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1879 if (local_initiator == sta->sta.tdls_initiator) {
1880 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1881 ret = -EINVAL;
1882 goto out;
1883 }
1884
1885 /* peer should have known better */
1886 if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs &&
1887 elems.sec_chan_offs->sec_chan_offs) {
1888 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1889 ret = -ENOTSUPP;
1890 goto out;
1891 }
1892
1893 params.chandef = &chandef;
1894 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1895 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1896
1897 params.tmpl_skb =
1898 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1899 &params.ch_sw_tm_ie);
1900 if (!params.tmpl_skb) {
1901 ret = -ENOENT;
1902 goto out;
1903 }
1904
1905 drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1906
1907 tdls_dbg(sdata,
1908 "TDLS ch switch request received from %pM ch %d width %d\n",
1909 tf->sa, params.chandef->chan->center_freq,
1910 params.chandef->width);
1911 out:
1912 mutex_unlock(&local->sta_mtx);
1913 dev_kfree_skb_any(params.tmpl_skb);
1914 return ret;
1915 }
1916
1917 static void
1918 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1919 struct sk_buff *skb)
1920 {
1921 struct ieee80211_tdls_data *tf = (void *)skb->data;
1922 struct wiphy *wiphy = sdata->local->hw.wiphy;
1923
1924 ASSERT_RTNL();
1925
1926 /* make sure the driver supports it */
1927 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1928 return;
1929
1930 /* we want to access the entire packet */
1931 if (skb_linearize(skb))
1932 return;
1933 /*
1934 * The packet/size was already validated by mac80211 Rx path, only look
1935 * at the action type.
1936 */
1937 switch (tf->action_code) {
1938 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1939 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1940 break;
1941 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1942 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1943 break;
1944 default:
1945 WARN_ON_ONCE(1);
1946 return;
1947 }
1948 }
1949
1950 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1951 {
1952 struct sta_info *sta;
1953 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1954
1955 rcu_read_lock();
1956 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1957 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1958 !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1959 continue;
1960
1961 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1962 NL80211_TDLS_TEARDOWN, reason,
1963 GFP_ATOMIC);
1964 }
1965 rcu_read_unlock();
1966 }
1967
1968 void ieee80211_tdls_chsw_work(struct work_struct *wk)
1969 {
1970 struct ieee80211_local *local =
1971 container_of(wk, struct ieee80211_local, tdls_chsw_work);
1972 struct ieee80211_sub_if_data *sdata;
1973 struct sk_buff *skb;
1974 struct ieee80211_tdls_data *tf;
1975
1976 rtnl_lock();
1977 while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) {
1978 tf = (struct ieee80211_tdls_data *)skb->data;
1979 list_for_each_entry(sdata, &local->interfaces, list) {
1980 if (!ieee80211_sdata_running(sdata) ||
1981 sdata->vif.type != NL80211_IFTYPE_STATION ||
1982 !ether_addr_equal(tf->da, sdata->vif.addr))
1983 continue;
1984
1985 ieee80211_process_tdls_channel_switch(sdata, skb);
1986 break;
1987 }
1988
1989 kfree_skb(skb);
1990 }
1991 rtnl_unlock();
1992 }
Linux with added FPC-III support