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sctp: Fix port hash table size computation
[deliverable/linux.git] / net / mac80211 / tdls.c
1 /*
2 * mac80211 TDLS handling code
3 *
4 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
5 * Copyright 2014, Intel Corporation
6 * Copyright 2014 Intel Mobile Communications GmbH
7 * Copyright 2015 Intel Deutschland GmbH
8 *
9 * This file is GPLv2 as found in COPYING.
10 */
11
12 #include <linux/ieee80211.h>
13 #include <linux/log2.h>
14 #include <net/cfg80211.h>
15 #include <linux/rtnetlink.h>
16 #include "ieee80211_i.h"
17 #include "driver-ops.h"
18
19 /* give usermode some time for retries in setting up the TDLS session */
20 #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ)
21
22 void ieee80211_tdls_peer_del_work(struct work_struct *wk)
23 {
24 struct ieee80211_sub_if_data *sdata;
25 struct ieee80211_local *local;
26
27 sdata = container_of(wk, struct ieee80211_sub_if_data,
28 u.mgd.tdls_peer_del_work.work);
29 local = sdata->local;
30
31 mutex_lock(&local->mtx);
32 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
33 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
34 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
35 eth_zero_addr(sdata->u.mgd.tdls_peer);
36 }
37 mutex_unlock(&local->mtx);
38 }
39
40 static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata,
41 struct sk_buff *skb)
42 {
43 struct ieee80211_local *local = sdata->local;
44 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
45 bool chan_switch = local->hw.wiphy->features &
46 NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
47 bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
48 !ifmgd->tdls_wider_bw_prohibited;
49 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
50 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
51 bool vht = sband && sband->vht_cap.vht_supported;
52 u8 *pos = (void *)skb_put(skb, 10);
53
54 *pos++ = WLAN_EID_EXT_CAPABILITY;
55 *pos++ = 8; /* len */
56 *pos++ = 0x0;
57 *pos++ = 0x0;
58 *pos++ = 0x0;
59 *pos++ = chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0;
60 *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
61 *pos++ = 0;
62 *pos++ = 0;
63 *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
64 }
65
66 static u8
67 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
68 struct sk_buff *skb, u16 start, u16 end,
69 u16 spacing)
70 {
71 u8 subband_cnt = 0, ch_cnt = 0;
72 struct ieee80211_channel *ch;
73 struct cfg80211_chan_def chandef;
74 int i, subband_start;
75 struct wiphy *wiphy = sdata->local->hw.wiphy;
76
77 for (i = start; i <= end; i += spacing) {
78 if (!ch_cnt)
79 subband_start = i;
80
81 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
82 if (ch) {
83 /* we will be active on the channel */
84 cfg80211_chandef_create(&chandef, ch,
85 NL80211_CHAN_NO_HT);
86 if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
87 sdata->wdev.iftype)) {
88 ch_cnt++;
89 /*
90 * check if the next channel is also part of
91 * this allowed range
92 */
93 continue;
94 }
95 }
96
97 /*
98 * we've reached the end of a range, with allowed channels
99 * found
100 */
101 if (ch_cnt) {
102 u8 *pos = skb_put(skb, 2);
103 *pos++ = ieee80211_frequency_to_channel(subband_start);
104 *pos++ = ch_cnt;
105
106 subband_cnt++;
107 ch_cnt = 0;
108 }
109 }
110
111 /* all channels in the requested range are allowed - add them here */
112 if (ch_cnt) {
113 u8 *pos = skb_put(skb, 2);
114 *pos++ = ieee80211_frequency_to_channel(subband_start);
115 *pos++ = ch_cnt;
116
117 subband_cnt++;
118 }
119
120 return subband_cnt;
121 }
122
123 static void
124 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
125 struct sk_buff *skb)
126 {
127 /*
128 * Add possible channels for TDLS. These are channels that are allowed
129 * to be active.
130 */
131 u8 subband_cnt;
132 u8 *pos = skb_put(skb, 2);
133
134 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
135
136 /*
137 * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
138 * this doesn't happen in real world scenarios.
139 */
140
141 /* 2GHz, with 5MHz spacing */
142 subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
143
144 /* 5GHz, with 20MHz spacing */
145 subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
146
147 /* length */
148 *pos = 2 * subband_cnt;
149 }
150
151 static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata,
152 struct sk_buff *skb)
153 {
154 u8 *pos;
155 u8 op_class;
156
157 if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef,
158 &op_class))
159 return;
160
161 pos = skb_put(skb, 4);
162 *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
163 *pos++ = 2; /* len */
164
165 *pos++ = op_class;
166 *pos++ = op_class; /* give current operating class as alternate too */
167 }
168
169 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
170 {
171 u8 *pos = (void *)skb_put(skb, 3);
172
173 *pos++ = WLAN_EID_BSS_COEX_2040;
174 *pos++ = 1; /* len */
175
176 *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
177 }
178
179 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
180 u16 status_code)
181 {
182 /* The capability will be 0 when sending a failure code */
183 if (status_code != 0)
184 return 0;
185
186 if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_2GHZ) {
187 return WLAN_CAPABILITY_SHORT_SLOT_TIME |
188 WLAN_CAPABILITY_SHORT_PREAMBLE;
189 }
190
191 return 0;
192 }
193
194 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
195 struct sk_buff *skb, const u8 *peer,
196 bool initiator)
197 {
198 struct ieee80211_tdls_lnkie *lnkid;
199 const u8 *init_addr, *rsp_addr;
200
201 if (initiator) {
202 init_addr = sdata->vif.addr;
203 rsp_addr = peer;
204 } else {
205 init_addr = peer;
206 rsp_addr = sdata->vif.addr;
207 }
208
209 lnkid = (void *)skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
210
211 lnkid->ie_type = WLAN_EID_LINK_ID;
212 lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
213
214 memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
215 memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
216 memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
217 }
218
219 static void
220 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
221 {
222 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
223 u8 *pos = (void *)skb_put(skb, 4);
224
225 *pos++ = WLAN_EID_AID;
226 *pos++ = 2; /* len */
227 put_unaligned_le16(ifmgd->aid, pos);
228 }
229
230 /* translate numbering in the WMM parameter IE to the mac80211 notation */
231 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
232 {
233 switch (ac) {
234 default:
235 WARN_ON_ONCE(1);
236 case 0:
237 return IEEE80211_AC_BE;
238 case 1:
239 return IEEE80211_AC_BK;
240 case 2:
241 return IEEE80211_AC_VI;
242 case 3:
243 return IEEE80211_AC_VO;
244 }
245 }
246
247 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
248 {
249 u8 ret;
250
251 ret = aifsn & 0x0f;
252 if (acm)
253 ret |= 0x10;
254 ret |= (aci << 5) & 0x60;
255 return ret;
256 }
257
258 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
259 {
260 return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
261 ((ilog2(cw_max + 1) << 0x4) & 0xf0);
262 }
263
264 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
265 struct sk_buff *skb)
266 {
267 struct ieee80211_wmm_param_ie *wmm;
268 struct ieee80211_tx_queue_params *txq;
269 int i;
270
271 wmm = (void *)skb_put(skb, sizeof(*wmm));
272 memset(wmm, 0, sizeof(*wmm));
273
274 wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
275 wmm->len = sizeof(*wmm) - 2;
276
277 wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
278 wmm->oui[1] = 0x50;
279 wmm->oui[2] = 0xf2;
280 wmm->oui_type = 2; /* WME */
281 wmm->oui_subtype = 1; /* WME param */
282 wmm->version = 1; /* WME ver */
283 wmm->qos_info = 0; /* U-APSD not in use */
284
285 /*
286 * Use the EDCA parameters defined for the BSS, or default if the AP
287 * doesn't support it, as mandated by 802.11-2012 section 10.22.4
288 */
289 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
290 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
291 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
292 txq->acm, i);
293 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
294 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
295 }
296 }
297
298 static void
299 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
300 struct sta_info *sta)
301 {
302 /* IEEE802.11ac-2013 Table E-4 */
303 u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
304 struct cfg80211_chan_def uc = sta->tdls_chandef;
305 enum nl80211_chan_width max_width = ieee80211_get_sta_bw(&sta->sta);
306 int i;
307
308 /* only support upgrading non-narrow channels up to 80Mhz */
309 if (max_width == NL80211_CHAN_WIDTH_5 ||
310 max_width == NL80211_CHAN_WIDTH_10)
311 return;
312
313 if (max_width > NL80211_CHAN_WIDTH_80)
314 max_width = NL80211_CHAN_WIDTH_80;
315
316 if (uc.width == max_width)
317 return;
318 /*
319 * Channel usage constrains in the IEEE802.11ac-2013 specification only
320 * allow expanding a 20MHz channel to 80MHz in a single way. In
321 * addition, there are no 40MHz allowed channels that are not part of
322 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
323 */
324 for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
325 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
326 uc.center_freq1 = centers_80mhz[i];
327 uc.width = NL80211_CHAN_WIDTH_80;
328 break;
329 }
330
331 if (!uc.center_freq1)
332 return;
333
334 /* proceed to downgrade the chandef until usable or the same */
335 while (uc.width > max_width &&
336 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
337 sdata->wdev.iftype))
338 ieee80211_chandef_downgrade(&uc);
339
340 if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
341 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
342 sta->tdls_chandef.width, uc.width);
343
344 /*
345 * the station is not yet authorized when BW upgrade is done,
346 * locking is not required
347 */
348 sta->tdls_chandef = uc;
349 }
350 }
351
352 static void
353 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
354 struct sk_buff *skb, const u8 *peer,
355 u8 action_code, bool initiator,
356 const u8 *extra_ies, size_t extra_ies_len)
357 {
358 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
359 struct ieee80211_local *local = sdata->local;
360 struct ieee80211_supported_band *sband;
361 struct ieee80211_sta_ht_cap ht_cap;
362 struct ieee80211_sta_vht_cap vht_cap;
363 struct sta_info *sta = NULL;
364 size_t offset = 0, noffset;
365 u8 *pos;
366
367 ieee80211_add_srates_ie(sdata, skb, false, band);
368 ieee80211_add_ext_srates_ie(sdata, skb, false, band);
369 ieee80211_tdls_add_supp_channels(sdata, skb);
370
371 /* add any custom IEs that go before Extended Capabilities */
372 if (extra_ies_len) {
373 static const u8 before_ext_cap[] = {
374 WLAN_EID_SUPP_RATES,
375 WLAN_EID_COUNTRY,
376 WLAN_EID_EXT_SUPP_RATES,
377 WLAN_EID_SUPPORTED_CHANNELS,
378 WLAN_EID_RSN,
379 };
380 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
381 before_ext_cap,
382 ARRAY_SIZE(before_ext_cap),
383 offset);
384 pos = skb_put(skb, noffset - offset);
385 memcpy(pos, extra_ies + offset, noffset - offset);
386 offset = noffset;
387 }
388
389 ieee80211_tdls_add_ext_capab(sdata, skb);
390
391 /* add the QoS element if we support it */
392 if (local->hw.queues >= IEEE80211_NUM_ACS &&
393 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
394 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
395
396 /* add any custom IEs that go before HT capabilities */
397 if (extra_ies_len) {
398 static const u8 before_ht_cap[] = {
399 WLAN_EID_SUPP_RATES,
400 WLAN_EID_COUNTRY,
401 WLAN_EID_EXT_SUPP_RATES,
402 WLAN_EID_SUPPORTED_CHANNELS,
403 WLAN_EID_RSN,
404 WLAN_EID_EXT_CAPABILITY,
405 WLAN_EID_QOS_CAPA,
406 WLAN_EID_FAST_BSS_TRANSITION,
407 WLAN_EID_TIMEOUT_INTERVAL,
408 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
409 };
410 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
411 before_ht_cap,
412 ARRAY_SIZE(before_ht_cap),
413 offset);
414 pos = skb_put(skb, noffset - offset);
415 memcpy(pos, extra_ies + offset, noffset - offset);
416 offset = noffset;
417 }
418
419 mutex_lock(&local->sta_mtx);
420
421 /* we should have the peer STA if we're already responding */
422 if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
423 sta = sta_info_get(sdata, peer);
424 if (WARN_ON_ONCE(!sta)) {
425 mutex_unlock(&local->sta_mtx);
426 return;
427 }
428
429 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
430 }
431
432 ieee80211_tdls_add_oper_classes(sdata, skb);
433
434 /*
435 * with TDLS we can switch channels, and HT-caps are not necessarily
436 * the same on all bands. The specification limits the setup to a
437 * single HT-cap, so use the current band for now.
438 */
439 sband = local->hw.wiphy->bands[band];
440 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
441
442 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
443 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
444 ht_cap.ht_supported) {
445 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
446
447 /* disable SMPS in TDLS initiator */
448 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
449 << IEEE80211_HT_CAP_SM_PS_SHIFT;
450
451 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
452 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
453 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
454 ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
455 /* the peer caps are already intersected with our own */
456 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
457
458 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
459 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
460 }
461
462 if (ht_cap.ht_supported &&
463 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
464 ieee80211_tdls_add_bss_coex_ie(skb);
465
466 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
467
468 /* add any custom IEs that go before VHT capabilities */
469 if (extra_ies_len) {
470 static const u8 before_vht_cap[] = {
471 WLAN_EID_SUPP_RATES,
472 WLAN_EID_COUNTRY,
473 WLAN_EID_EXT_SUPP_RATES,
474 WLAN_EID_SUPPORTED_CHANNELS,
475 WLAN_EID_RSN,
476 WLAN_EID_EXT_CAPABILITY,
477 WLAN_EID_QOS_CAPA,
478 WLAN_EID_FAST_BSS_TRANSITION,
479 WLAN_EID_TIMEOUT_INTERVAL,
480 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
481 WLAN_EID_MULTI_BAND,
482 };
483 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
484 before_vht_cap,
485 ARRAY_SIZE(before_vht_cap),
486 offset);
487 pos = skb_put(skb, noffset - offset);
488 memcpy(pos, extra_ies + offset, noffset - offset);
489 offset = noffset;
490 }
491
492 /* build the VHT-cap similarly to the HT-cap */
493 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
494 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
495 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
496 vht_cap.vht_supported) {
497 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
498
499 /* the AID is present only when VHT is implemented */
500 if (action_code == WLAN_TDLS_SETUP_REQUEST)
501 ieee80211_tdls_add_aid(sdata, skb);
502
503 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
504 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
505 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
506 vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
507 /* the peer caps are already intersected with our own */
508 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
509
510 /* the AID is present only when VHT is implemented */
511 ieee80211_tdls_add_aid(sdata, skb);
512
513 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
514 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
515
516 /*
517 * if both peers support WIDER_BW, we can expand the chandef to
518 * a wider compatible one, up to 80MHz
519 */
520 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
521 ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
522 }
523
524 mutex_unlock(&local->sta_mtx);
525
526 /* add any remaining IEs */
527 if (extra_ies_len) {
528 noffset = extra_ies_len;
529 pos = skb_put(skb, noffset - offset);
530 memcpy(pos, extra_ies + offset, noffset - offset);
531 }
532
533 }
534
535 static void
536 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
537 struct sk_buff *skb, const u8 *peer,
538 bool initiator, const u8 *extra_ies,
539 size_t extra_ies_len)
540 {
541 struct ieee80211_local *local = sdata->local;
542 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
543 size_t offset = 0, noffset;
544 struct sta_info *sta, *ap_sta;
545 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
546 u8 *pos;
547
548 mutex_lock(&local->sta_mtx);
549
550 sta = sta_info_get(sdata, peer);
551 ap_sta = sta_info_get(sdata, ifmgd->bssid);
552 if (WARN_ON_ONCE(!sta || !ap_sta)) {
553 mutex_unlock(&local->sta_mtx);
554 return;
555 }
556
557 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
558
559 /* add any custom IEs that go before the QoS IE */
560 if (extra_ies_len) {
561 static const u8 before_qos[] = {
562 WLAN_EID_RSN,
563 };
564 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
565 before_qos,
566 ARRAY_SIZE(before_qos),
567 offset);
568 pos = skb_put(skb, noffset - offset);
569 memcpy(pos, extra_ies + offset, noffset - offset);
570 offset = noffset;
571 }
572
573 /* add the QoS param IE if both the peer and we support it */
574 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
575 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
576
577 /* add any custom IEs that go before HT operation */
578 if (extra_ies_len) {
579 static const u8 before_ht_op[] = {
580 WLAN_EID_RSN,
581 WLAN_EID_QOS_CAPA,
582 WLAN_EID_FAST_BSS_TRANSITION,
583 WLAN_EID_TIMEOUT_INTERVAL,
584 };
585 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
586 before_ht_op,
587 ARRAY_SIZE(before_ht_op),
588 offset);
589 pos = skb_put(skb, noffset - offset);
590 memcpy(pos, extra_ies + offset, noffset - offset);
591 offset = noffset;
592 }
593
594 /*
595 * if HT support is only added in TDLS, we need an HT-operation IE.
596 * add the IE as required by IEEE802.11-2012 9.23.3.2.
597 */
598 if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
599 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
600 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
601 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
602
603 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
604 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
605 &sdata->vif.bss_conf.chandef, prot,
606 true);
607 }
608
609 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
610
611 /* only include VHT-operation if not on the 2.4GHz band */
612 if (band != IEEE80211_BAND_2GHZ && sta->sta.vht_cap.vht_supported) {
613 /*
614 * if both peers support WIDER_BW, we can expand the chandef to
615 * a wider compatible one, up to 80MHz
616 */
617 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
618 ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
619
620 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
621 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
622 &sta->tdls_chandef);
623 }
624
625 mutex_unlock(&local->sta_mtx);
626
627 /* add any remaining IEs */
628 if (extra_ies_len) {
629 noffset = extra_ies_len;
630 pos = skb_put(skb, noffset - offset);
631 memcpy(pos, extra_ies + offset, noffset - offset);
632 }
633 }
634
635 static void
636 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
637 struct sk_buff *skb, const u8 *peer,
638 bool initiator, const u8 *extra_ies,
639 size_t extra_ies_len, u8 oper_class,
640 struct cfg80211_chan_def *chandef)
641 {
642 struct ieee80211_tdls_data *tf;
643 size_t offset = 0, noffset;
644 u8 *pos;
645
646 if (WARN_ON_ONCE(!chandef))
647 return;
648
649 tf = (void *)skb->data;
650 tf->u.chan_switch_req.target_channel =
651 ieee80211_frequency_to_channel(chandef->chan->center_freq);
652 tf->u.chan_switch_req.oper_class = oper_class;
653
654 if (extra_ies_len) {
655 static const u8 before_lnkie[] = {
656 WLAN_EID_SECONDARY_CHANNEL_OFFSET,
657 };
658 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
659 before_lnkie,
660 ARRAY_SIZE(before_lnkie),
661 offset);
662 pos = skb_put(skb, noffset - offset);
663 memcpy(pos, extra_ies + offset, noffset - offset);
664 offset = noffset;
665 }
666
667 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
668
669 /* add any remaining IEs */
670 if (extra_ies_len) {
671 noffset = extra_ies_len;
672 pos = skb_put(skb, noffset - offset);
673 memcpy(pos, extra_ies + offset, noffset - offset);
674 }
675 }
676
677 static void
678 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
679 struct sk_buff *skb, const u8 *peer,
680 u16 status_code, bool initiator,
681 const u8 *extra_ies,
682 size_t extra_ies_len)
683 {
684 if (status_code == 0)
685 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
686
687 if (extra_ies_len)
688 memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
689 }
690
691 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
692 struct sk_buff *skb, const u8 *peer,
693 u8 action_code, u16 status_code,
694 bool initiator, const u8 *extra_ies,
695 size_t extra_ies_len, u8 oper_class,
696 struct cfg80211_chan_def *chandef)
697 {
698 switch (action_code) {
699 case WLAN_TDLS_SETUP_REQUEST:
700 case WLAN_TDLS_SETUP_RESPONSE:
701 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
702 if (status_code == 0)
703 ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
704 action_code,
705 initiator,
706 extra_ies,
707 extra_ies_len);
708 break;
709 case WLAN_TDLS_SETUP_CONFIRM:
710 if (status_code == 0)
711 ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
712 initiator, extra_ies,
713 extra_ies_len);
714 break;
715 case WLAN_TDLS_TEARDOWN:
716 case WLAN_TDLS_DISCOVERY_REQUEST:
717 if (extra_ies_len)
718 memcpy(skb_put(skb, extra_ies_len), extra_ies,
719 extra_ies_len);
720 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
721 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
722 break;
723 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
724 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
725 initiator, extra_ies,
726 extra_ies_len,
727 oper_class, chandef);
728 break;
729 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
730 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
731 status_code,
732 initiator, extra_ies,
733 extra_ies_len);
734 break;
735 }
736
737 }
738
739 static int
740 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
741 const u8 *peer, u8 action_code, u8 dialog_token,
742 u16 status_code, struct sk_buff *skb)
743 {
744 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
745 struct ieee80211_tdls_data *tf;
746
747 tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
748
749 memcpy(tf->da, peer, ETH_ALEN);
750 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
751 tf->ether_type = cpu_to_be16(ETH_P_TDLS);
752 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
753
754 /* network header is after the ethernet header */
755 skb_set_network_header(skb, ETH_HLEN);
756
757 switch (action_code) {
758 case WLAN_TDLS_SETUP_REQUEST:
759 tf->category = WLAN_CATEGORY_TDLS;
760 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
761
762 skb_put(skb, sizeof(tf->u.setup_req));
763 tf->u.setup_req.dialog_token = dialog_token;
764 tf->u.setup_req.capability =
765 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
766 status_code));
767 break;
768 case WLAN_TDLS_SETUP_RESPONSE:
769 tf->category = WLAN_CATEGORY_TDLS;
770 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
771
772 skb_put(skb, sizeof(tf->u.setup_resp));
773 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
774 tf->u.setup_resp.dialog_token = dialog_token;
775 tf->u.setup_resp.capability =
776 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
777 status_code));
778 break;
779 case WLAN_TDLS_SETUP_CONFIRM:
780 tf->category = WLAN_CATEGORY_TDLS;
781 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
782
783 skb_put(skb, sizeof(tf->u.setup_cfm));
784 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
785 tf->u.setup_cfm.dialog_token = dialog_token;
786 break;
787 case WLAN_TDLS_TEARDOWN:
788 tf->category = WLAN_CATEGORY_TDLS;
789 tf->action_code = WLAN_TDLS_TEARDOWN;
790
791 skb_put(skb, sizeof(tf->u.teardown));
792 tf->u.teardown.reason_code = cpu_to_le16(status_code);
793 break;
794 case WLAN_TDLS_DISCOVERY_REQUEST:
795 tf->category = WLAN_CATEGORY_TDLS;
796 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
797
798 skb_put(skb, sizeof(tf->u.discover_req));
799 tf->u.discover_req.dialog_token = dialog_token;
800 break;
801 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
802 tf->category = WLAN_CATEGORY_TDLS;
803 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
804
805 skb_put(skb, sizeof(tf->u.chan_switch_req));
806 break;
807 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
808 tf->category = WLAN_CATEGORY_TDLS;
809 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
810
811 skb_put(skb, sizeof(tf->u.chan_switch_resp));
812 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
813 break;
814 default:
815 return -EINVAL;
816 }
817
818 return 0;
819 }
820
821 static int
822 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
823 const u8 *peer, u8 action_code, u8 dialog_token,
824 u16 status_code, struct sk_buff *skb)
825 {
826 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
827 struct ieee80211_mgmt *mgmt;
828
829 mgmt = (void *)skb_put(skb, 24);
830 memset(mgmt, 0, 24);
831 memcpy(mgmt->da, peer, ETH_ALEN);
832 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
833 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
834
835 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
836 IEEE80211_STYPE_ACTION);
837
838 switch (action_code) {
839 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
840 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
841 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
842 mgmt->u.action.u.tdls_discover_resp.action_code =
843 WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
844 mgmt->u.action.u.tdls_discover_resp.dialog_token =
845 dialog_token;
846 mgmt->u.action.u.tdls_discover_resp.capability =
847 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
848 status_code));
849 break;
850 default:
851 return -EINVAL;
852 }
853
854 return 0;
855 }
856
857 static struct sk_buff *
858 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
859 const u8 *peer, u8 action_code,
860 u8 dialog_token, u16 status_code,
861 bool initiator, const u8 *extra_ies,
862 size_t extra_ies_len, u8 oper_class,
863 struct cfg80211_chan_def *chandef)
864 {
865 struct ieee80211_local *local = sdata->local;
866 struct sk_buff *skb;
867 int ret;
868
869 skb = netdev_alloc_skb(sdata->dev,
870 local->hw.extra_tx_headroom +
871 max(sizeof(struct ieee80211_mgmt),
872 sizeof(struct ieee80211_tdls_data)) +
873 50 + /* supported rates */
874 10 + /* ext capab */
875 26 + /* max(WMM-info, WMM-param) */
876 2 + max(sizeof(struct ieee80211_ht_cap),
877 sizeof(struct ieee80211_ht_operation)) +
878 2 + max(sizeof(struct ieee80211_vht_cap),
879 sizeof(struct ieee80211_vht_operation)) +
880 50 + /* supported channels */
881 3 + /* 40/20 BSS coex */
882 4 + /* AID */
883 4 + /* oper classes */
884 extra_ies_len +
885 sizeof(struct ieee80211_tdls_lnkie));
886 if (!skb)
887 return NULL;
888
889 skb_reserve(skb, local->hw.extra_tx_headroom);
890
891 switch (action_code) {
892 case WLAN_TDLS_SETUP_REQUEST:
893 case WLAN_TDLS_SETUP_RESPONSE:
894 case WLAN_TDLS_SETUP_CONFIRM:
895 case WLAN_TDLS_TEARDOWN:
896 case WLAN_TDLS_DISCOVERY_REQUEST:
897 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
898 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
899 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
900 sdata->dev, peer,
901 action_code, dialog_token,
902 status_code, skb);
903 break;
904 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
905 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
906 peer, action_code,
907 dialog_token, status_code,
908 skb);
909 break;
910 default:
911 ret = -ENOTSUPP;
912 break;
913 }
914
915 if (ret < 0)
916 goto fail;
917
918 ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
919 initiator, extra_ies, extra_ies_len, oper_class,
920 chandef);
921 return skb;
922
923 fail:
924 dev_kfree_skb(skb);
925 return NULL;
926 }
927
928 static int
929 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
930 const u8 *peer, u8 action_code, u8 dialog_token,
931 u16 status_code, u32 peer_capability,
932 bool initiator, const u8 *extra_ies,
933 size_t extra_ies_len, u8 oper_class,
934 struct cfg80211_chan_def *chandef)
935 {
936 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
937 struct sk_buff *skb = NULL;
938 struct sta_info *sta;
939 u32 flags = 0;
940 int ret = 0;
941
942 rcu_read_lock();
943 sta = sta_info_get(sdata, peer);
944
945 /* infer the initiator if we can, to support old userspace */
946 switch (action_code) {
947 case WLAN_TDLS_SETUP_REQUEST:
948 if (sta) {
949 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
950 sta->sta.tdls_initiator = false;
951 }
952 /* fall-through */
953 case WLAN_TDLS_SETUP_CONFIRM:
954 case WLAN_TDLS_DISCOVERY_REQUEST:
955 initiator = true;
956 break;
957 case WLAN_TDLS_SETUP_RESPONSE:
958 /*
959 * In some testing scenarios, we send a request and response.
960 * Make the last packet sent take effect for the initiator
961 * value.
962 */
963 if (sta) {
964 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
965 sta->sta.tdls_initiator = true;
966 }
967 /* fall-through */
968 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
969 initiator = false;
970 break;
971 case WLAN_TDLS_TEARDOWN:
972 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
973 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
974 /* any value is ok */
975 break;
976 default:
977 ret = -ENOTSUPP;
978 break;
979 }
980
981 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
982 initiator = true;
983
984 rcu_read_unlock();
985 if (ret < 0)
986 goto fail;
987
988 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
989 dialog_token, status_code,
990 initiator, extra_ies,
991 extra_ies_len, oper_class,
992 chandef);
993 if (!skb) {
994 ret = -EINVAL;
995 goto fail;
996 }
997
998 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
999 ieee80211_tx_skb(sdata, skb);
1000 return 0;
1001 }
1002
1003 /*
1004 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1005 * we should default to AC_VI.
1006 */
1007 switch (action_code) {
1008 case WLAN_TDLS_SETUP_REQUEST:
1009 case WLAN_TDLS_SETUP_RESPONSE:
1010 skb_set_queue_mapping(skb, IEEE80211_AC_BK);
1011 skb->priority = 2;
1012 break;
1013 default:
1014 skb_set_queue_mapping(skb, IEEE80211_AC_VI);
1015 skb->priority = 5;
1016 break;
1017 }
1018
1019 /*
1020 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1021 * Later, if no ACK is returned from peer, we will re-send the teardown
1022 * packet through the AP.
1023 */
1024 if ((action_code == WLAN_TDLS_TEARDOWN) &&
1025 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1026 bool try_resend; /* Should we keep skb for possible resend */
1027
1028 /* If not sending directly to peer - no point in keeping skb */
1029 rcu_read_lock();
1030 sta = sta_info_get(sdata, peer);
1031 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1032 rcu_read_unlock();
1033
1034 spin_lock_bh(&sdata->u.mgd.teardown_lock);
1035 if (try_resend && !sdata->u.mgd.teardown_skb) {
1036 /* Mark it as requiring TX status callback */
1037 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1038 IEEE80211_TX_INTFL_MLME_CONN_TX;
1039
1040 /*
1041 * skb is copied since mac80211 will later set
1042 * properties that might not be the same as the AP,
1043 * such as encryption, QoS, addresses, etc.
1044 *
1045 * No problem if skb_copy() fails, so no need to check.
1046 */
1047 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1048 sdata->u.mgd.orig_teardown_skb = skb;
1049 }
1050 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1051 }
1052
1053 /* disable bottom halves when entering the Tx path */
1054 local_bh_disable();
1055 __ieee80211_subif_start_xmit(skb, dev, flags);
1056 local_bh_enable();
1057
1058 return ret;
1059
1060 fail:
1061 dev_kfree_skb(skb);
1062 return ret;
1063 }
1064
1065 static int
1066 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1067 const u8 *peer, u8 action_code, u8 dialog_token,
1068 u16 status_code, u32 peer_capability, bool initiator,
1069 const u8 *extra_ies, size_t extra_ies_len)
1070 {
1071 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1072 struct ieee80211_local *local = sdata->local;
1073 enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode;
1074 int ret;
1075
1076 /* don't support setup with forced SMPS mode that's not off */
1077 if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1078 smps_mode != IEEE80211_SMPS_OFF) {
1079 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1080 smps_mode);
1081 return -ENOTSUPP;
1082 }
1083
1084 mutex_lock(&local->mtx);
1085
1086 /* we don't support concurrent TDLS peer setups */
1087 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1088 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1089 ret = -EBUSY;
1090 goto out_unlock;
1091 }
1092
1093 /*
1094 * make sure we have a STA representing the peer so we drop or buffer
1095 * non-TDLS-setup frames to the peer. We can't send other packets
1096 * during setup through the AP path.
1097 * Allow error packets to be sent - sometimes we don't even add a STA
1098 * before failing the setup.
1099 */
1100 if (status_code == 0) {
1101 rcu_read_lock();
1102 if (!sta_info_get(sdata, peer)) {
1103 rcu_read_unlock();
1104 ret = -ENOLINK;
1105 goto out_unlock;
1106 }
1107 rcu_read_unlock();
1108 }
1109
1110 ieee80211_flush_queues(local, sdata, false);
1111 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1112 mutex_unlock(&local->mtx);
1113
1114 /* we cannot take the mutex while preparing the setup packet */
1115 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1116 dialog_token, status_code,
1117 peer_capability, initiator,
1118 extra_ies, extra_ies_len, 0,
1119 NULL);
1120 if (ret < 0) {
1121 mutex_lock(&local->mtx);
1122 eth_zero_addr(sdata->u.mgd.tdls_peer);
1123 mutex_unlock(&local->mtx);
1124 return ret;
1125 }
1126
1127 ieee80211_queue_delayed_work(&sdata->local->hw,
1128 &sdata->u.mgd.tdls_peer_del_work,
1129 TDLS_PEER_SETUP_TIMEOUT);
1130 return 0;
1131
1132 out_unlock:
1133 mutex_unlock(&local->mtx);
1134 return ret;
1135 }
1136
1137 static int
1138 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1139 const u8 *peer, u8 action_code, u8 dialog_token,
1140 u16 status_code, u32 peer_capability,
1141 bool initiator, const u8 *extra_ies,
1142 size_t extra_ies_len)
1143 {
1144 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1145 struct ieee80211_local *local = sdata->local;
1146 struct sta_info *sta;
1147 int ret;
1148
1149 /*
1150 * No packets can be transmitted to the peer via the AP during setup -
1151 * the STA is set as a TDLS peer, but is not authorized.
1152 * During teardown, we prevent direct transmissions by stopping the
1153 * queues and flushing all direct packets.
1154 */
1155 ieee80211_stop_vif_queues(local, sdata,
1156 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1157 ieee80211_flush_queues(local, sdata, false);
1158
1159 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1160 dialog_token, status_code,
1161 peer_capability, initiator,
1162 extra_ies, extra_ies_len, 0,
1163 NULL);
1164 if (ret < 0)
1165 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1166 ret);
1167
1168 /*
1169 * Remove the STA AUTH flag to force further traffic through the AP. If
1170 * the STA was unreachable, it was already removed.
1171 */
1172 rcu_read_lock();
1173 sta = sta_info_get(sdata, peer);
1174 if (sta)
1175 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1176 rcu_read_unlock();
1177
1178 ieee80211_wake_vif_queues(local, sdata,
1179 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1180
1181 return 0;
1182 }
1183
1184 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1185 const u8 *peer, u8 action_code, u8 dialog_token,
1186 u16 status_code, u32 peer_capability,
1187 bool initiator, const u8 *extra_ies,
1188 size_t extra_ies_len)
1189 {
1190 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1191 int ret;
1192
1193 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1194 return -ENOTSUPP;
1195
1196 /* make sure we are in managed mode, and associated */
1197 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1198 !sdata->u.mgd.associated)
1199 return -EINVAL;
1200
1201 switch (action_code) {
1202 case WLAN_TDLS_SETUP_REQUEST:
1203 case WLAN_TDLS_SETUP_RESPONSE:
1204 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1205 dialog_token, status_code,
1206 peer_capability, initiator,
1207 extra_ies, extra_ies_len);
1208 break;
1209 case WLAN_TDLS_TEARDOWN:
1210 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1211 action_code, dialog_token,
1212 status_code,
1213 peer_capability, initiator,
1214 extra_ies, extra_ies_len);
1215 break;
1216 case WLAN_TDLS_DISCOVERY_REQUEST:
1217 /*
1218 * Protect the discovery so we can hear the TDLS discovery
1219 * response frame. It is transmitted directly and not buffered
1220 * by the AP.
1221 */
1222 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1223 /* fall-through */
1224 case WLAN_TDLS_SETUP_CONFIRM:
1225 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1226 /* no special handling */
1227 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1228 action_code,
1229 dialog_token,
1230 status_code,
1231 peer_capability,
1232 initiator, extra_ies,
1233 extra_ies_len, 0, NULL);
1234 break;
1235 default:
1236 ret = -EOPNOTSUPP;
1237 break;
1238 }
1239
1240 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1241 action_code, peer, ret);
1242 return ret;
1243 }
1244
1245 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata)
1246 {
1247 struct ieee80211_local *local = sdata->local;
1248 struct ieee80211_chanctx_conf *conf;
1249 struct ieee80211_chanctx *ctx;
1250
1251 mutex_lock(&local->chanctx_mtx);
1252 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1253 lockdep_is_held(&local->chanctx_mtx));
1254 if (conf) {
1255 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1256 ieee80211_recalc_chanctx_chantype(local, ctx);
1257 }
1258 mutex_unlock(&local->chanctx_mtx);
1259 }
1260
1261 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1262 {
1263 struct sta_info *sta;
1264 bool result = false;
1265
1266 rcu_read_lock();
1267 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1268 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1269 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1270 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1271 !sta->sta.ht_cap.ht_supported)
1272 continue;
1273 result = true;
1274 break;
1275 }
1276 rcu_read_unlock();
1277
1278 return result;
1279 }
1280
1281 static void
1282 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1283 struct sta_info *sta)
1284 {
1285 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1286 bool tdls_ht;
1287 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1288 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1289 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1290 u16 opmode;
1291
1292 /* Nothing to do if the BSS connection uses HT */
1293 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
1294 return;
1295
1296 tdls_ht = (sta && sta->sta.ht_cap.ht_supported) ||
1297 iee80211_tdls_have_ht_peers(sdata);
1298
1299 opmode = sdata->vif.bss_conf.ht_operation_mode;
1300
1301 if (tdls_ht)
1302 opmode |= protection;
1303 else
1304 opmode &= ~protection;
1305
1306 if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1307 return;
1308
1309 sdata->vif.bss_conf.ht_operation_mode = opmode;
1310 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT);
1311 }
1312
1313 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1314 const u8 *peer, enum nl80211_tdls_operation oper)
1315 {
1316 struct sta_info *sta;
1317 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1318 struct ieee80211_local *local = sdata->local;
1319 int ret;
1320
1321 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1322 return -ENOTSUPP;
1323
1324 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1325 return -EINVAL;
1326
1327 switch (oper) {
1328 case NL80211_TDLS_ENABLE_LINK:
1329 case NL80211_TDLS_DISABLE_LINK:
1330 break;
1331 case NL80211_TDLS_TEARDOWN:
1332 case NL80211_TDLS_SETUP:
1333 case NL80211_TDLS_DISCOVERY_REQ:
1334 /* We don't support in-driver setup/teardown/discovery */
1335 return -ENOTSUPP;
1336 }
1337
1338 /* protect possible bss_conf changes and avoid concurrency in
1339 * ieee80211_bss_info_change_notify()
1340 */
1341 sdata_lock(sdata);
1342 mutex_lock(&local->mtx);
1343 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1344
1345 switch (oper) {
1346 case NL80211_TDLS_ENABLE_LINK:
1347 if (sdata->vif.csa_active) {
1348 tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1349 ret = -EBUSY;
1350 break;
1351 }
1352
1353 iee80211_tdls_recalc_chanctx(sdata);
1354
1355 mutex_lock(&local->sta_mtx);
1356 sta = sta_info_get(sdata, peer);
1357 if (!sta) {
1358 mutex_unlock(&local->sta_mtx);
1359 ret = -ENOLINK;
1360 break;
1361 }
1362
1363 iee80211_tdls_recalc_ht_protection(sdata, sta);
1364
1365 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1366 mutex_unlock(&local->sta_mtx);
1367
1368 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1369 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1370 ret = 0;
1371 break;
1372 case NL80211_TDLS_DISABLE_LINK:
1373 /*
1374 * The teardown message in ieee80211_tdls_mgmt_teardown() was
1375 * created while the queues were stopped, so it might still be
1376 * pending. Before flushing the queues we need to be sure the
1377 * message is handled by the tasklet handling pending messages,
1378 * otherwise we might start destroying the station before
1379 * sending the teardown packet.
1380 * Note that this only forces the tasklet to flush pendings -
1381 * not to stop the tasklet from rescheduling itself.
1382 */
1383 tasklet_kill(&local->tx_pending_tasklet);
1384 /* flush a potentially queued teardown packet */
1385 ieee80211_flush_queues(local, sdata, false);
1386
1387 ret = sta_info_destroy_addr(sdata, peer);
1388
1389 mutex_lock(&local->sta_mtx);
1390 iee80211_tdls_recalc_ht_protection(sdata, NULL);
1391 mutex_unlock(&local->sta_mtx);
1392
1393 iee80211_tdls_recalc_chanctx(sdata);
1394 break;
1395 default:
1396 ret = -ENOTSUPP;
1397 break;
1398 }
1399
1400 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1401 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1402 eth_zero_addr(sdata->u.mgd.tdls_peer);
1403 }
1404
1405 if (ret == 0)
1406 ieee80211_queue_work(&sdata->local->hw,
1407 &sdata->u.mgd.request_smps_work);
1408
1409 mutex_unlock(&local->mtx);
1410 sdata_unlock(sdata);
1411 return ret;
1412 }
1413
1414 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1415 enum nl80211_tdls_operation oper,
1416 u16 reason_code, gfp_t gfp)
1417 {
1418 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1419
1420 if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1421 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1422 oper);
1423 return;
1424 }
1425
1426 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1427 }
1428 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1429
1430 static void
1431 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1432 {
1433 struct ieee80211_ch_switch_timing *ch_sw;
1434
1435 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1436 *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1437
1438 ch_sw = (void *)buf;
1439 ch_sw->switch_time = cpu_to_le16(switch_time);
1440 ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1441 }
1442
1443 /* find switch timing IE in SKB ready for Tx */
1444 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1445 {
1446 struct ieee80211_tdls_data *tf;
1447 const u8 *ie_start;
1448
1449 /*
1450 * Get the offset for the new location of the switch timing IE.
1451 * The SKB network header will now point to the "payload_type"
1452 * element of the TDLS data frame struct.
1453 */
1454 tf = container_of(skb->data + skb_network_offset(skb),
1455 struct ieee80211_tdls_data, payload_type);
1456 ie_start = tf->u.chan_switch_req.variable;
1457 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1458 skb->len - (ie_start - skb->data));
1459 }
1460
1461 static struct sk_buff *
1462 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1463 struct cfg80211_chan_def *chandef,
1464 u32 *ch_sw_tm_ie_offset)
1465 {
1466 struct ieee80211_sub_if_data *sdata = sta->sdata;
1467 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1468 2 + sizeof(struct ieee80211_ch_switch_timing)];
1469 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1470 u8 *pos = extra_ies;
1471 struct sk_buff *skb;
1472
1473 /*
1474 * if chandef points to a wide channel add a Secondary-Channel
1475 * Offset information element
1476 */
1477 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1478 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1479 bool ht40plus;
1480
1481 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1482 *pos++ = sizeof(*sec_chan_ie);
1483 sec_chan_ie = (void *)pos;
1484
1485 ht40plus = cfg80211_get_chandef_type(chandef) ==
1486 NL80211_CHAN_HT40PLUS;
1487 sec_chan_ie->sec_chan_offs = ht40plus ?
1488 IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1489 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1490 pos += sizeof(*sec_chan_ie);
1491
1492 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1493 }
1494
1495 /* just set the values to 0, this is a template */
1496 iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1497
1498 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1499 WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1500 0, 0, !sta->sta.tdls_initiator,
1501 extra_ies, extra_ies_len,
1502 oper_class, chandef);
1503 if (!skb)
1504 return NULL;
1505
1506 skb = ieee80211_build_data_template(sdata, skb, 0);
1507 if (IS_ERR(skb)) {
1508 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1509 return NULL;
1510 }
1511
1512 if (ch_sw_tm_ie_offset) {
1513 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1514
1515 if (!tm_ie) {
1516 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1517 dev_kfree_skb_any(skb);
1518 return NULL;
1519 }
1520
1521 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1522 }
1523
1524 tdls_dbg(sdata,
1525 "TDLS channel switch request template for %pM ch %d width %d\n",
1526 sta->sta.addr, chandef->chan->center_freq, chandef->width);
1527 return skb;
1528 }
1529
1530 int
1531 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1532 const u8 *addr, u8 oper_class,
1533 struct cfg80211_chan_def *chandef)
1534 {
1535 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1536 struct ieee80211_local *local = sdata->local;
1537 struct sta_info *sta;
1538 struct sk_buff *skb = NULL;
1539 u32 ch_sw_tm_ie;
1540 int ret;
1541
1542 mutex_lock(&local->sta_mtx);
1543 sta = sta_info_get(sdata, addr);
1544 if (!sta) {
1545 tdls_dbg(sdata,
1546 "Invalid TDLS peer %pM for channel switch request\n",
1547 addr);
1548 ret = -ENOENT;
1549 goto out;
1550 }
1551
1552 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1553 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1554 addr);
1555 ret = -ENOTSUPP;
1556 goto out;
1557 }
1558
1559 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1560 &ch_sw_tm_ie);
1561 if (!skb) {
1562 ret = -ENOENT;
1563 goto out;
1564 }
1565
1566 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1567 chandef, skb, ch_sw_tm_ie);
1568 if (!ret)
1569 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1570
1571 out:
1572 mutex_unlock(&local->sta_mtx);
1573 dev_kfree_skb_any(skb);
1574 return ret;
1575 }
1576
1577 void
1578 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1579 struct net_device *dev,
1580 const u8 *addr)
1581 {
1582 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1583 struct ieee80211_local *local = sdata->local;
1584 struct sta_info *sta;
1585
1586 mutex_lock(&local->sta_mtx);
1587 sta = sta_info_get(sdata, addr);
1588 if (!sta) {
1589 tdls_dbg(sdata,
1590 "Invalid TDLS peer %pM for channel switch cancel\n",
1591 addr);
1592 goto out;
1593 }
1594
1595 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1596 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1597 addr);
1598 goto out;
1599 }
1600
1601 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1602 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1603
1604 out:
1605 mutex_unlock(&local->sta_mtx);
1606 }
1607
1608 static struct sk_buff *
1609 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1610 u32 *ch_sw_tm_ie_offset)
1611 {
1612 struct ieee80211_sub_if_data *sdata = sta->sdata;
1613 struct sk_buff *skb;
1614 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1615
1616 /* initial timing are always zero in the template */
1617 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1618
1619 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1620 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1621 0, 0, !sta->sta.tdls_initiator,
1622 extra_ies, sizeof(extra_ies), 0, NULL);
1623 if (!skb)
1624 return NULL;
1625
1626 skb = ieee80211_build_data_template(sdata, skb, 0);
1627 if (IS_ERR(skb)) {
1628 tdls_dbg(sdata,
1629 "Failed building TDLS channel switch resp frame\n");
1630 return NULL;
1631 }
1632
1633 if (ch_sw_tm_ie_offset) {
1634 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1635
1636 if (!tm_ie) {
1637 tdls_dbg(sdata,
1638 "No switch timing IE in TDLS switch resp\n");
1639 dev_kfree_skb_any(skb);
1640 return NULL;
1641 }
1642
1643 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1644 }
1645
1646 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1647 sta->sta.addr);
1648 return skb;
1649 }
1650
1651 static int
1652 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1653 struct sk_buff *skb)
1654 {
1655 struct ieee80211_local *local = sdata->local;
1656 struct ieee802_11_elems elems;
1657 struct sta_info *sta;
1658 struct ieee80211_tdls_data *tf = (void *)skb->data;
1659 bool local_initiator;
1660 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1661 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1662 struct ieee80211_tdls_ch_sw_params params = {};
1663 int ret;
1664
1665 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1666 params.timestamp = rx_status->device_timestamp;
1667
1668 if (skb->len < baselen) {
1669 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1670 skb->len);
1671 return -EINVAL;
1672 }
1673
1674 mutex_lock(&local->sta_mtx);
1675 sta = sta_info_get(sdata, tf->sa);
1676 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1677 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1678 tf->sa);
1679 ret = -EINVAL;
1680 goto out;
1681 }
1682
1683 params.sta = &sta->sta;
1684 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1685 if (params.status != 0) {
1686 ret = 0;
1687 goto call_drv;
1688 }
1689
1690 ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1691 skb->len - baselen, false, &elems);
1692 if (elems.parse_error) {
1693 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1694 ret = -EINVAL;
1695 goto out;
1696 }
1697
1698 if (!elems.ch_sw_timing || !elems.lnk_id) {
1699 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1700 ret = -EINVAL;
1701 goto out;
1702 }
1703
1704 /* validate the initiator is set correctly */
1705 local_initiator =
1706 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1707 if (local_initiator == sta->sta.tdls_initiator) {
1708 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1709 ret = -EINVAL;
1710 goto out;
1711 }
1712
1713 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1714 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1715
1716 params.tmpl_skb =
1717 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1718 if (!params.tmpl_skb) {
1719 ret = -ENOENT;
1720 goto out;
1721 }
1722
1723 call_drv:
1724 drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1725
1726 tdls_dbg(sdata,
1727 "TDLS channel switch response received from %pM status %d\n",
1728 tf->sa, params.status);
1729
1730 out:
1731 mutex_unlock(&local->sta_mtx);
1732 dev_kfree_skb_any(params.tmpl_skb);
1733 return ret;
1734 }
1735
1736 static int
1737 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1738 struct sk_buff *skb)
1739 {
1740 struct ieee80211_local *local = sdata->local;
1741 struct ieee802_11_elems elems;
1742 struct cfg80211_chan_def chandef;
1743 struct ieee80211_channel *chan;
1744 enum nl80211_channel_type chan_type;
1745 int freq;
1746 u8 target_channel, oper_class;
1747 bool local_initiator;
1748 struct sta_info *sta;
1749 enum ieee80211_band band;
1750 struct ieee80211_tdls_data *tf = (void *)skb->data;
1751 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1752 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1753 struct ieee80211_tdls_ch_sw_params params = {};
1754 int ret = 0;
1755
1756 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1757 params.timestamp = rx_status->device_timestamp;
1758
1759 if (skb->len < baselen) {
1760 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1761 skb->len);
1762 return -EINVAL;
1763 }
1764
1765 target_channel = tf->u.chan_switch_req.target_channel;
1766 oper_class = tf->u.chan_switch_req.oper_class;
1767
1768 /*
1769 * We can't easily infer the channel band. The operating class is
1770 * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1771 * solution here is to treat channels with number >14 as 5GHz ones,
1772 * and specifically check for the (oper_class, channel) combinations
1773 * where this doesn't hold. These are thankfully unique according to
1774 * IEEE802.11-2012.
1775 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1776 * valid here.
1777 */
1778 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1779 oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1780 target_channel < 14)
1781 band = IEEE80211_BAND_5GHZ;
1782 else
1783 band = target_channel < 14 ? IEEE80211_BAND_2GHZ :
1784 IEEE80211_BAND_5GHZ;
1785
1786 freq = ieee80211_channel_to_frequency(target_channel, band);
1787 if (freq == 0) {
1788 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1789 target_channel);
1790 return -EINVAL;
1791 }
1792
1793 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1794 if (!chan) {
1795 tdls_dbg(sdata,
1796 "Unsupported channel for TDLS chan switch: %d\n",
1797 target_channel);
1798 return -EINVAL;
1799 }
1800
1801 ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1802 skb->len - baselen, false, &elems);
1803 if (elems.parse_error) {
1804 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1805 return -EINVAL;
1806 }
1807
1808 if (!elems.ch_sw_timing || !elems.lnk_id) {
1809 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1810 return -EINVAL;
1811 }
1812
1813 if (!elems.sec_chan_offs) {
1814 chan_type = NL80211_CHAN_HT20;
1815 } else {
1816 switch (elems.sec_chan_offs->sec_chan_offs) {
1817 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1818 chan_type = NL80211_CHAN_HT40PLUS;
1819 break;
1820 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1821 chan_type = NL80211_CHAN_HT40MINUS;
1822 break;
1823 default:
1824 chan_type = NL80211_CHAN_HT20;
1825 break;
1826 }
1827 }
1828
1829 cfg80211_chandef_create(&chandef, chan, chan_type);
1830
1831 /* we will be active on the TDLS link */
1832 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1833 sdata->wdev.iftype)) {
1834 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1835 return -EINVAL;
1836 }
1837
1838 mutex_lock(&local->sta_mtx);
1839 sta = sta_info_get(sdata, tf->sa);
1840 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1841 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1842 tf->sa);
1843 ret = -EINVAL;
1844 goto out;
1845 }
1846
1847 params.sta = &sta->sta;
1848
1849 /* validate the initiator is set correctly */
1850 local_initiator =
1851 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1852 if (local_initiator == sta->sta.tdls_initiator) {
1853 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1854 ret = -EINVAL;
1855 goto out;
1856 }
1857
1858 /* peer should have known better */
1859 if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs &&
1860 elems.sec_chan_offs->sec_chan_offs) {
1861 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1862 ret = -ENOTSUPP;
1863 goto out;
1864 }
1865
1866 params.chandef = &chandef;
1867 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1868 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1869
1870 params.tmpl_skb =
1871 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1872 &params.ch_sw_tm_ie);
1873 if (!params.tmpl_skb) {
1874 ret = -ENOENT;
1875 goto out;
1876 }
1877
1878 drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1879
1880 tdls_dbg(sdata,
1881 "TDLS ch switch request received from %pM ch %d width %d\n",
1882 tf->sa, params.chandef->chan->center_freq,
1883 params.chandef->width);
1884 out:
1885 mutex_unlock(&local->sta_mtx);
1886 dev_kfree_skb_any(params.tmpl_skb);
1887 return ret;
1888 }
1889
1890 static void
1891 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1892 struct sk_buff *skb)
1893 {
1894 struct ieee80211_tdls_data *tf = (void *)skb->data;
1895 struct wiphy *wiphy = sdata->local->hw.wiphy;
1896
1897 ASSERT_RTNL();
1898
1899 /* make sure the driver supports it */
1900 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1901 return;
1902
1903 /* we want to access the entire packet */
1904 if (skb_linearize(skb))
1905 return;
1906 /*
1907 * The packet/size was already validated by mac80211 Rx path, only look
1908 * at the action type.
1909 */
1910 switch (tf->action_code) {
1911 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1912 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1913 break;
1914 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1915 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1916 break;
1917 default:
1918 WARN_ON_ONCE(1);
1919 return;
1920 }
1921 }
1922
1923 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1924 {
1925 struct sta_info *sta;
1926 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1927
1928 rcu_read_lock();
1929 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1930 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1931 !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1932 continue;
1933
1934 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1935 NL80211_TDLS_TEARDOWN, reason,
1936 GFP_ATOMIC);
1937 }
1938 rcu_read_unlock();
1939 }
1940
1941 void ieee80211_tdls_chsw_work(struct work_struct *wk)
1942 {
1943 struct ieee80211_local *local =
1944 container_of(wk, struct ieee80211_local, tdls_chsw_work);
1945 struct ieee80211_sub_if_data *sdata;
1946 struct sk_buff *skb;
1947 struct ieee80211_tdls_data *tf;
1948
1949 rtnl_lock();
1950 while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) {
1951 tf = (struct ieee80211_tdls_data *)skb->data;
1952 list_for_each_entry(sdata, &local->interfaces, list) {
1953 if (!ieee80211_sdata_running(sdata) ||
1954 sdata->vif.type != NL80211_IFTYPE_STATION ||
1955 !ether_addr_equal(tf->da, sdata->vif.addr))
1956 continue;
1957
1958 ieee80211_process_tdls_channel_switch(sdata, skb);
1959 break;
1960 }
1961
1962 kfree_skb(skb);
1963 }
1964 rtnl_unlock();
1965 }
Linux kernel - Deliverables
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