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[mirror_ubuntu-bionic-kernel.git] / net / mac80211 / tdls.c
1 /*
2 * mac80211 TDLS handling code
3 *
4 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
5 * Copyright 2014, Intel Corporation
6 * Copyright 2014 Intel Mobile Communications GmbH
7 *
8 * This file is GPLv2 as found in COPYING.
9 */
10
11 #include <linux/ieee80211.h>
12 #include <linux/log2.h>
13 #include <net/cfg80211.h>
14 #include "ieee80211_i.h"
15 #include "driver-ops.h"
16
17 /* give usermode some time for retries in setting up the TDLS session */
18 #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ)
19
20 void ieee80211_tdls_peer_del_work(struct work_struct *wk)
21 {
22 struct ieee80211_sub_if_data *sdata;
23 struct ieee80211_local *local;
24
25 sdata = container_of(wk, struct ieee80211_sub_if_data,
26 u.mgd.tdls_peer_del_work.work);
27 local = sdata->local;
28
29 mutex_lock(&local->mtx);
30 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
31 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
32 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
33 eth_zero_addr(sdata->u.mgd.tdls_peer);
34 }
35 mutex_unlock(&local->mtx);
36 }
37
38 static void ieee80211_tdls_add_ext_capab(struct ieee80211_local *local,
39 struct sk_buff *skb)
40 {
41 u8 *pos = (void *)skb_put(skb, 7);
42 bool chan_switch = local->hw.wiphy->features &
43 NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
44
45 *pos++ = WLAN_EID_EXT_CAPABILITY;
46 *pos++ = 5; /* len */
47 *pos++ = 0x0;
48 *pos++ = 0x0;
49 *pos++ = 0x0;
50 *pos++ = chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0;
51 *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
52 }
53
54 static u8
55 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
56 struct sk_buff *skb, u16 start, u16 end,
57 u16 spacing)
58 {
59 u8 subband_cnt = 0, ch_cnt = 0;
60 struct ieee80211_channel *ch;
61 struct cfg80211_chan_def chandef;
62 int i, subband_start;
63
64 for (i = start; i <= end; i += spacing) {
65 if (!ch_cnt)
66 subband_start = i;
67
68 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
69 if (ch) {
70 /* we will be active on the channel */
71 cfg80211_chandef_create(&chandef, ch,
72 NL80211_CHAN_NO_HT);
73 if (cfg80211_reg_can_beacon(sdata->local->hw.wiphy,
74 &chandef,
75 sdata->wdev.iftype)) {
76 ch_cnt++;
77 /*
78 * check if the next channel is also part of
79 * this allowed range
80 */
81 continue;
82 }
83 }
84
85 /*
86 * we've reached the end of a range, with allowed channels
87 * found
88 */
89 if (ch_cnt) {
90 u8 *pos = skb_put(skb, 2);
91 *pos++ = ieee80211_frequency_to_channel(subband_start);
92 *pos++ = ch_cnt;
93
94 subband_cnt++;
95 ch_cnt = 0;
96 }
97 }
98
99 /* all channels in the requested range are allowed - add them here */
100 if (ch_cnt) {
101 u8 *pos = skb_put(skb, 2);
102 *pos++ = ieee80211_frequency_to_channel(subband_start);
103 *pos++ = ch_cnt;
104
105 subband_cnt++;
106 }
107
108 return subband_cnt;
109 }
110
111 static void
112 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
113 struct sk_buff *skb)
114 {
115 /*
116 * Add possible channels for TDLS. These are channels that are allowed
117 * to be active.
118 */
119 u8 subband_cnt;
120 u8 *pos = skb_put(skb, 2);
121
122 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
123
124 /*
125 * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
126 * this doesn't happen in real world scenarios.
127 */
128
129 /* 2GHz, with 5MHz spacing */
130 subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
131
132 /* 5GHz, with 20MHz spacing */
133 subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
134
135 /* length */
136 *pos = 2 * subband_cnt;
137 }
138
139 static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata,
140 struct sk_buff *skb)
141 {
142 u8 *pos;
143 u8 op_class;
144
145 if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef,
146 &op_class))
147 return;
148
149 pos = skb_put(skb, 4);
150 *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
151 *pos++ = 2; /* len */
152
153 *pos++ = op_class;
154 *pos++ = op_class; /* give current operating class as alternate too */
155 }
156
157 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
158 {
159 u8 *pos = (void *)skb_put(skb, 3);
160
161 *pos++ = WLAN_EID_BSS_COEX_2040;
162 *pos++ = 1; /* len */
163
164 *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
165 }
166
167 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
168 u16 status_code)
169 {
170 struct ieee80211_local *local = sdata->local;
171 u16 capab;
172
173 /* The capability will be 0 when sending a failure code */
174 if (status_code != 0)
175 return 0;
176
177 capab = 0;
178 if (ieee80211_get_sdata_band(sdata) != IEEE80211_BAND_2GHZ)
179 return capab;
180
181 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
182 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
183 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
184 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
185
186 return capab;
187 }
188
189 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
190 struct sk_buff *skb, const u8 *peer,
191 bool initiator)
192 {
193 struct ieee80211_tdls_lnkie *lnkid;
194 const u8 *init_addr, *rsp_addr;
195
196 if (initiator) {
197 init_addr = sdata->vif.addr;
198 rsp_addr = peer;
199 } else {
200 init_addr = peer;
201 rsp_addr = sdata->vif.addr;
202 }
203
204 lnkid = (void *)skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
205
206 lnkid->ie_type = WLAN_EID_LINK_ID;
207 lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
208
209 memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
210 memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
211 memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
212 }
213
214 static void
215 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
216 {
217 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
218 u8 *pos = (void *)skb_put(skb, 4);
219
220 *pos++ = WLAN_EID_AID;
221 *pos++ = 2; /* len */
222 put_unaligned_le16(ifmgd->aid, pos);
223 }
224
225 /* translate numbering in the WMM parameter IE to the mac80211 notation */
226 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
227 {
228 switch (ac) {
229 default:
230 WARN_ON_ONCE(1);
231 case 0:
232 return IEEE80211_AC_BE;
233 case 1:
234 return IEEE80211_AC_BK;
235 case 2:
236 return IEEE80211_AC_VI;
237 case 3:
238 return IEEE80211_AC_VO;
239 }
240 }
241
242 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
243 {
244 u8 ret;
245
246 ret = aifsn & 0x0f;
247 if (acm)
248 ret |= 0x10;
249 ret |= (aci << 5) & 0x60;
250 return ret;
251 }
252
253 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
254 {
255 return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
256 ((ilog2(cw_max + 1) << 0x4) & 0xf0);
257 }
258
259 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
260 struct sk_buff *skb)
261 {
262 struct ieee80211_wmm_param_ie *wmm;
263 struct ieee80211_tx_queue_params *txq;
264 int i;
265
266 wmm = (void *)skb_put(skb, sizeof(*wmm));
267 memset(wmm, 0, sizeof(*wmm));
268
269 wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
270 wmm->len = sizeof(*wmm) - 2;
271
272 wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
273 wmm->oui[1] = 0x50;
274 wmm->oui[2] = 0xf2;
275 wmm->oui_type = 2; /* WME */
276 wmm->oui_subtype = 1; /* WME param */
277 wmm->version = 1; /* WME ver */
278 wmm->qos_info = 0; /* U-APSD not in use */
279
280 /*
281 * Use the EDCA parameters defined for the BSS, or default if the AP
282 * doesn't support it, as mandated by 802.11-2012 section 10.22.4
283 */
284 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
285 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
286 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
287 txq->acm, i);
288 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
289 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
290 }
291 }
292
293 static void
294 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
295 struct sk_buff *skb, const u8 *peer,
296 u8 action_code, bool initiator,
297 const u8 *extra_ies, size_t extra_ies_len)
298 {
299 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
300 struct ieee80211_local *local = sdata->local;
301 struct ieee80211_supported_band *sband;
302 struct ieee80211_sta_ht_cap ht_cap;
303 struct ieee80211_sta_vht_cap vht_cap;
304 struct sta_info *sta = NULL;
305 size_t offset = 0, noffset;
306 u8 *pos;
307
308 ieee80211_add_srates_ie(sdata, skb, false, band);
309 ieee80211_add_ext_srates_ie(sdata, skb, false, band);
310 ieee80211_tdls_add_supp_channels(sdata, skb);
311
312 /* add any custom IEs that go before Extended Capabilities */
313 if (extra_ies_len) {
314 static const u8 before_ext_cap[] = {
315 WLAN_EID_SUPP_RATES,
316 WLAN_EID_COUNTRY,
317 WLAN_EID_EXT_SUPP_RATES,
318 WLAN_EID_SUPPORTED_CHANNELS,
319 WLAN_EID_RSN,
320 };
321 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
322 before_ext_cap,
323 ARRAY_SIZE(before_ext_cap),
324 offset);
325 pos = skb_put(skb, noffset - offset);
326 memcpy(pos, extra_ies + offset, noffset - offset);
327 offset = noffset;
328 }
329
330 ieee80211_tdls_add_ext_capab(local, skb);
331
332 /* add the QoS element if we support it */
333 if (local->hw.queues >= IEEE80211_NUM_ACS &&
334 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
335 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
336
337 /* add any custom IEs that go before HT capabilities */
338 if (extra_ies_len) {
339 static const u8 before_ht_cap[] = {
340 WLAN_EID_SUPP_RATES,
341 WLAN_EID_COUNTRY,
342 WLAN_EID_EXT_SUPP_RATES,
343 WLAN_EID_SUPPORTED_CHANNELS,
344 WLAN_EID_RSN,
345 WLAN_EID_EXT_CAPABILITY,
346 WLAN_EID_QOS_CAPA,
347 WLAN_EID_FAST_BSS_TRANSITION,
348 WLAN_EID_TIMEOUT_INTERVAL,
349 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
350 };
351 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
352 before_ht_cap,
353 ARRAY_SIZE(before_ht_cap),
354 offset);
355 pos = skb_put(skb, noffset - offset);
356 memcpy(pos, extra_ies + offset, noffset - offset);
357 offset = noffset;
358 }
359
360 rcu_read_lock();
361
362 /* we should have the peer STA if we're already responding */
363 if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
364 sta = sta_info_get(sdata, peer);
365 if (WARN_ON_ONCE(!sta)) {
366 rcu_read_unlock();
367 return;
368 }
369 }
370
371 ieee80211_tdls_add_oper_classes(sdata, skb);
372
373 /*
374 * with TDLS we can switch channels, and HT-caps are not necessarily
375 * the same on all bands. The specification limits the setup to a
376 * single HT-cap, so use the current band for now.
377 */
378 sband = local->hw.wiphy->bands[band];
379 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
380
381 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
382 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
383 ht_cap.ht_supported) {
384 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
385
386 /* disable SMPS in TDLS initiator */
387 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
388 << IEEE80211_HT_CAP_SM_PS_SHIFT;
389
390 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
391 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
392 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
393 ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
394 /* disable SMPS in TDLS responder */
395 sta->sta.ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
396 << IEEE80211_HT_CAP_SM_PS_SHIFT;
397
398 /* the peer caps are already intersected with our own */
399 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
400
401 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
402 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
403 }
404
405 if (ht_cap.ht_supported &&
406 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
407 ieee80211_tdls_add_bss_coex_ie(skb);
408
409 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
410
411 /* add any custom IEs that go before VHT capabilities */
412 if (extra_ies_len) {
413 static const u8 before_vht_cap[] = {
414 WLAN_EID_SUPP_RATES,
415 WLAN_EID_COUNTRY,
416 WLAN_EID_EXT_SUPP_RATES,
417 WLAN_EID_SUPPORTED_CHANNELS,
418 WLAN_EID_RSN,
419 WLAN_EID_EXT_CAPABILITY,
420 WLAN_EID_QOS_CAPA,
421 WLAN_EID_FAST_BSS_TRANSITION,
422 WLAN_EID_TIMEOUT_INTERVAL,
423 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
424 WLAN_EID_MULTI_BAND,
425 };
426 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
427 before_vht_cap,
428 ARRAY_SIZE(before_vht_cap),
429 offset);
430 pos = skb_put(skb, noffset - offset);
431 memcpy(pos, extra_ies + offset, noffset - offset);
432 offset = noffset;
433 }
434
435 /* build the VHT-cap similarly to the HT-cap */
436 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
437 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
438 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
439 vht_cap.vht_supported) {
440 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
441
442 /* the AID is present only when VHT is implemented */
443 if (action_code == WLAN_TDLS_SETUP_REQUEST)
444 ieee80211_tdls_add_aid(sdata, skb);
445
446 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
447 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
448 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
449 vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
450 /* the peer caps are already intersected with our own */
451 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
452
453 /* the AID is present only when VHT is implemented */
454 ieee80211_tdls_add_aid(sdata, skb);
455
456 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
457 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
458 }
459
460 rcu_read_unlock();
461
462 /* add any remaining IEs */
463 if (extra_ies_len) {
464 noffset = extra_ies_len;
465 pos = skb_put(skb, noffset - offset);
466 memcpy(pos, extra_ies + offset, noffset - offset);
467 }
468
469 }
470
471 static void
472 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
473 struct sk_buff *skb, const u8 *peer,
474 bool initiator, const u8 *extra_ies,
475 size_t extra_ies_len)
476 {
477 struct ieee80211_local *local = sdata->local;
478 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
479 size_t offset = 0, noffset;
480 struct sta_info *sta, *ap_sta;
481 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
482 u8 *pos;
483
484 rcu_read_lock();
485
486 sta = sta_info_get(sdata, peer);
487 ap_sta = sta_info_get(sdata, ifmgd->bssid);
488 if (WARN_ON_ONCE(!sta || !ap_sta)) {
489 rcu_read_unlock();
490 return;
491 }
492
493 /* add any custom IEs that go before the QoS IE */
494 if (extra_ies_len) {
495 static const u8 before_qos[] = {
496 WLAN_EID_RSN,
497 };
498 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
499 before_qos,
500 ARRAY_SIZE(before_qos),
501 offset);
502 pos = skb_put(skb, noffset - offset);
503 memcpy(pos, extra_ies + offset, noffset - offset);
504 offset = noffset;
505 }
506
507 /* add the QoS param IE if both the peer and we support it */
508 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
509 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
510
511 /* add any custom IEs that go before HT operation */
512 if (extra_ies_len) {
513 static const u8 before_ht_op[] = {
514 WLAN_EID_RSN,
515 WLAN_EID_QOS_CAPA,
516 WLAN_EID_FAST_BSS_TRANSITION,
517 WLAN_EID_TIMEOUT_INTERVAL,
518 };
519 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
520 before_ht_op,
521 ARRAY_SIZE(before_ht_op),
522 offset);
523 pos = skb_put(skb, noffset - offset);
524 memcpy(pos, extra_ies + offset, noffset - offset);
525 offset = noffset;
526 }
527
528 /* if HT support is only added in TDLS, we need an HT-operation IE */
529 if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
530 struct ieee80211_chanctx_conf *chanctx_conf =
531 rcu_dereference(sdata->vif.chanctx_conf);
532 if (!WARN_ON(!chanctx_conf)) {
533 pos = skb_put(skb, 2 +
534 sizeof(struct ieee80211_ht_operation));
535 /* send an empty HT operation IE */
536 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
537 &chanctx_conf->def, 0);
538 }
539 }
540
541 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
542
543 /* only include VHT-operation if not on the 2.4GHz band */
544 if (band != IEEE80211_BAND_2GHZ && !ap_sta->sta.vht_cap.vht_supported &&
545 sta->sta.vht_cap.vht_supported) {
546 struct ieee80211_chanctx_conf *chanctx_conf =
547 rcu_dereference(sdata->vif.chanctx_conf);
548 if (!WARN_ON(!chanctx_conf)) {
549 pos = skb_put(skb, 2 +
550 sizeof(struct ieee80211_vht_operation));
551 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
552 &chanctx_conf->def);
553 }
554 }
555
556 rcu_read_unlock();
557
558 /* add any remaining IEs */
559 if (extra_ies_len) {
560 noffset = extra_ies_len;
561 pos = skb_put(skb, noffset - offset);
562 memcpy(pos, extra_ies + offset, noffset - offset);
563 }
564 }
565
566 static void
567 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
568 struct sk_buff *skb, const u8 *peer,
569 bool initiator, const u8 *extra_ies,
570 size_t extra_ies_len, u8 oper_class,
571 struct cfg80211_chan_def *chandef)
572 {
573 struct ieee80211_tdls_data *tf;
574 size_t offset = 0, noffset;
575 u8 *pos;
576
577 if (WARN_ON_ONCE(!chandef))
578 return;
579
580 tf = (void *)skb->data;
581 tf->u.chan_switch_req.target_channel =
582 ieee80211_frequency_to_channel(chandef->chan->center_freq);
583 tf->u.chan_switch_req.oper_class = oper_class;
584
585 if (extra_ies_len) {
586 static const u8 before_lnkie[] = {
587 WLAN_EID_SECONDARY_CHANNEL_OFFSET,
588 };
589 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
590 before_lnkie,
591 ARRAY_SIZE(before_lnkie),
592 offset);
593 pos = skb_put(skb, noffset - offset);
594 memcpy(pos, extra_ies + offset, noffset - offset);
595 offset = noffset;
596 }
597
598 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
599
600 /* add any remaining IEs */
601 if (extra_ies_len) {
602 noffset = extra_ies_len;
603 pos = skb_put(skb, noffset - offset);
604 memcpy(pos, extra_ies + offset, noffset - offset);
605 }
606 }
607
608 static void
609 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
610 struct sk_buff *skb, const u8 *peer,
611 u16 status_code, bool initiator,
612 const u8 *extra_ies,
613 size_t extra_ies_len)
614 {
615 if (status_code == 0)
616 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
617
618 if (extra_ies_len)
619 memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
620 }
621
622 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
623 struct sk_buff *skb, const u8 *peer,
624 u8 action_code, u16 status_code,
625 bool initiator, const u8 *extra_ies,
626 size_t extra_ies_len, u8 oper_class,
627 struct cfg80211_chan_def *chandef)
628 {
629 switch (action_code) {
630 case WLAN_TDLS_SETUP_REQUEST:
631 case WLAN_TDLS_SETUP_RESPONSE:
632 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
633 if (status_code == 0)
634 ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
635 action_code,
636 initiator,
637 extra_ies,
638 extra_ies_len);
639 break;
640 case WLAN_TDLS_SETUP_CONFIRM:
641 if (status_code == 0)
642 ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
643 initiator, extra_ies,
644 extra_ies_len);
645 break;
646 case WLAN_TDLS_TEARDOWN:
647 case WLAN_TDLS_DISCOVERY_REQUEST:
648 if (extra_ies_len)
649 memcpy(skb_put(skb, extra_ies_len), extra_ies,
650 extra_ies_len);
651 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
652 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
653 break;
654 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
655 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
656 initiator, extra_ies,
657 extra_ies_len,
658 oper_class, chandef);
659 break;
660 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
661 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
662 status_code,
663 initiator, extra_ies,
664 extra_ies_len);
665 break;
666 }
667
668 }
669
670 static int
671 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
672 const u8 *peer, u8 action_code, u8 dialog_token,
673 u16 status_code, struct sk_buff *skb)
674 {
675 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
676 struct ieee80211_tdls_data *tf;
677
678 tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
679
680 memcpy(tf->da, peer, ETH_ALEN);
681 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
682 tf->ether_type = cpu_to_be16(ETH_P_TDLS);
683 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
684
685 /* network header is after the ethernet header */
686 skb_set_network_header(skb, ETH_HLEN);
687
688 switch (action_code) {
689 case WLAN_TDLS_SETUP_REQUEST:
690 tf->category = WLAN_CATEGORY_TDLS;
691 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
692
693 skb_put(skb, sizeof(tf->u.setup_req));
694 tf->u.setup_req.dialog_token = dialog_token;
695 tf->u.setup_req.capability =
696 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
697 status_code));
698 break;
699 case WLAN_TDLS_SETUP_RESPONSE:
700 tf->category = WLAN_CATEGORY_TDLS;
701 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
702
703 skb_put(skb, sizeof(tf->u.setup_resp));
704 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
705 tf->u.setup_resp.dialog_token = dialog_token;
706 tf->u.setup_resp.capability =
707 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
708 status_code));
709 break;
710 case WLAN_TDLS_SETUP_CONFIRM:
711 tf->category = WLAN_CATEGORY_TDLS;
712 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
713
714 skb_put(skb, sizeof(tf->u.setup_cfm));
715 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
716 tf->u.setup_cfm.dialog_token = dialog_token;
717 break;
718 case WLAN_TDLS_TEARDOWN:
719 tf->category = WLAN_CATEGORY_TDLS;
720 tf->action_code = WLAN_TDLS_TEARDOWN;
721
722 skb_put(skb, sizeof(tf->u.teardown));
723 tf->u.teardown.reason_code = cpu_to_le16(status_code);
724 break;
725 case WLAN_TDLS_DISCOVERY_REQUEST:
726 tf->category = WLAN_CATEGORY_TDLS;
727 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
728
729 skb_put(skb, sizeof(tf->u.discover_req));
730 tf->u.discover_req.dialog_token = dialog_token;
731 break;
732 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
733 tf->category = WLAN_CATEGORY_TDLS;
734 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
735
736 skb_put(skb, sizeof(tf->u.chan_switch_req));
737 break;
738 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
739 tf->category = WLAN_CATEGORY_TDLS;
740 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
741
742 skb_put(skb, sizeof(tf->u.chan_switch_resp));
743 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
744 break;
745 default:
746 return -EINVAL;
747 }
748
749 return 0;
750 }
751
752 static int
753 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
754 const u8 *peer, u8 action_code, u8 dialog_token,
755 u16 status_code, struct sk_buff *skb)
756 {
757 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
758 struct ieee80211_mgmt *mgmt;
759
760 mgmt = (void *)skb_put(skb, 24);
761 memset(mgmt, 0, 24);
762 memcpy(mgmt->da, peer, ETH_ALEN);
763 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
764 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
765
766 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
767 IEEE80211_STYPE_ACTION);
768
769 switch (action_code) {
770 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
771 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
772 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
773 mgmt->u.action.u.tdls_discover_resp.action_code =
774 WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
775 mgmt->u.action.u.tdls_discover_resp.dialog_token =
776 dialog_token;
777 mgmt->u.action.u.tdls_discover_resp.capability =
778 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
779 status_code));
780 break;
781 default:
782 return -EINVAL;
783 }
784
785 return 0;
786 }
787
788 static struct sk_buff *
789 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
790 const u8 *peer, u8 action_code,
791 u8 dialog_token, u16 status_code,
792 bool initiator, const u8 *extra_ies,
793 size_t extra_ies_len, u8 oper_class,
794 struct cfg80211_chan_def *chandef)
795 {
796 struct ieee80211_local *local = sdata->local;
797 struct sk_buff *skb;
798 int ret;
799
800 skb = netdev_alloc_skb(sdata->dev,
801 local->hw.extra_tx_headroom +
802 max(sizeof(struct ieee80211_mgmt),
803 sizeof(struct ieee80211_tdls_data)) +
804 50 + /* supported rates */
805 7 + /* ext capab */
806 26 + /* max(WMM-info, WMM-param) */
807 2 + max(sizeof(struct ieee80211_ht_cap),
808 sizeof(struct ieee80211_ht_operation)) +
809 2 + max(sizeof(struct ieee80211_vht_cap),
810 sizeof(struct ieee80211_vht_operation)) +
811 50 + /* supported channels */
812 3 + /* 40/20 BSS coex */
813 4 + /* AID */
814 4 + /* oper classes */
815 extra_ies_len +
816 sizeof(struct ieee80211_tdls_lnkie));
817 if (!skb)
818 return NULL;
819
820 skb_reserve(skb, local->hw.extra_tx_headroom);
821
822 switch (action_code) {
823 case WLAN_TDLS_SETUP_REQUEST:
824 case WLAN_TDLS_SETUP_RESPONSE:
825 case WLAN_TDLS_SETUP_CONFIRM:
826 case WLAN_TDLS_TEARDOWN:
827 case WLAN_TDLS_DISCOVERY_REQUEST:
828 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
829 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
830 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
831 sdata->dev, peer,
832 action_code, dialog_token,
833 status_code, skb);
834 break;
835 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
836 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
837 peer, action_code,
838 dialog_token, status_code,
839 skb);
840 break;
841 default:
842 ret = -ENOTSUPP;
843 break;
844 }
845
846 if (ret < 0)
847 goto fail;
848
849 ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
850 initiator, extra_ies, extra_ies_len, oper_class,
851 chandef);
852 return skb;
853
854 fail:
855 dev_kfree_skb(skb);
856 return NULL;
857 }
858
859 static int
860 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
861 const u8 *peer, u8 action_code, u8 dialog_token,
862 u16 status_code, u32 peer_capability,
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_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
868 struct sk_buff *skb = NULL;
869 struct sta_info *sta;
870 u32 flags = 0;
871 int ret = 0;
872
873 rcu_read_lock();
874 sta = sta_info_get(sdata, peer);
875
876 /* infer the initiator if we can, to support old userspace */
877 switch (action_code) {
878 case WLAN_TDLS_SETUP_REQUEST:
879 if (sta) {
880 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
881 sta->sta.tdls_initiator = false;
882 }
883 /* fall-through */
884 case WLAN_TDLS_SETUP_CONFIRM:
885 case WLAN_TDLS_DISCOVERY_REQUEST:
886 initiator = true;
887 break;
888 case WLAN_TDLS_SETUP_RESPONSE:
889 /*
890 * In some testing scenarios, we send a request and response.
891 * Make the last packet sent take effect for the initiator
892 * value.
893 */
894 if (sta) {
895 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
896 sta->sta.tdls_initiator = true;
897 }
898 /* fall-through */
899 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
900 initiator = false;
901 break;
902 case WLAN_TDLS_TEARDOWN:
903 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
904 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
905 /* any value is ok */
906 break;
907 default:
908 ret = -ENOTSUPP;
909 break;
910 }
911
912 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
913 initiator = true;
914
915 rcu_read_unlock();
916 if (ret < 0)
917 goto fail;
918
919 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
920 dialog_token, status_code,
921 initiator, extra_ies,
922 extra_ies_len, oper_class,
923 chandef);
924 if (!skb) {
925 ret = -EINVAL;
926 goto fail;
927 }
928
929 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
930 ieee80211_tx_skb(sdata, skb);
931 return 0;
932 }
933
934 /*
935 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
936 * we should default to AC_VI.
937 */
938 switch (action_code) {
939 case WLAN_TDLS_SETUP_REQUEST:
940 case WLAN_TDLS_SETUP_RESPONSE:
941 skb_set_queue_mapping(skb, IEEE80211_AC_BK);
942 skb->priority = 2;
943 break;
944 default:
945 skb_set_queue_mapping(skb, IEEE80211_AC_VI);
946 skb->priority = 5;
947 break;
948 }
949
950 /*
951 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
952 * Later, if no ACK is returned from peer, we will re-send the teardown
953 * packet through the AP.
954 */
955 if ((action_code == WLAN_TDLS_TEARDOWN) &&
956 (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
957 bool try_resend; /* Should we keep skb for possible resend */
958
959 /* If not sending directly to peer - no point in keeping skb */
960 rcu_read_lock();
961 sta = sta_info_get(sdata, peer);
962 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
963 rcu_read_unlock();
964
965 spin_lock_bh(&sdata->u.mgd.teardown_lock);
966 if (try_resend && !sdata->u.mgd.teardown_skb) {
967 /* Mark it as requiring TX status callback */
968 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
969 IEEE80211_TX_INTFL_MLME_CONN_TX;
970
971 /*
972 * skb is copied since mac80211 will later set
973 * properties that might not be the same as the AP,
974 * such as encryption, QoS, addresses, etc.
975 *
976 * No problem if skb_copy() fails, so no need to check.
977 */
978 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
979 sdata->u.mgd.orig_teardown_skb = skb;
980 }
981 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
982 }
983
984 /* disable bottom halves when entering the Tx path */
985 local_bh_disable();
986 __ieee80211_subif_start_xmit(skb, dev, flags);
987 local_bh_enable();
988
989 return ret;
990
991 fail:
992 dev_kfree_skb(skb);
993 return ret;
994 }
995
996 static int
997 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
998 const u8 *peer, u8 action_code, u8 dialog_token,
999 u16 status_code, u32 peer_capability, bool initiator,
1000 const u8 *extra_ies, size_t extra_ies_len)
1001 {
1002 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1003 struct ieee80211_local *local = sdata->local;
1004 int ret;
1005
1006 mutex_lock(&local->mtx);
1007
1008 /* we don't support concurrent TDLS peer setups */
1009 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1010 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1011 ret = -EBUSY;
1012 goto out_unlock;
1013 }
1014
1015 /*
1016 * make sure we have a STA representing the peer so we drop or buffer
1017 * non-TDLS-setup frames to the peer. We can't send other packets
1018 * during setup through the AP path.
1019 * Allow error packets to be sent - sometimes we don't even add a STA
1020 * before failing the setup.
1021 */
1022 if (status_code == 0) {
1023 rcu_read_lock();
1024 if (!sta_info_get(sdata, peer)) {
1025 rcu_read_unlock();
1026 ret = -ENOLINK;
1027 goto out_unlock;
1028 }
1029 rcu_read_unlock();
1030 }
1031
1032 ieee80211_flush_queues(local, sdata, false);
1033 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1034 mutex_unlock(&local->mtx);
1035
1036 /* we cannot take the mutex while preparing the setup packet */
1037 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1038 dialog_token, status_code,
1039 peer_capability, initiator,
1040 extra_ies, extra_ies_len, 0,
1041 NULL);
1042 if (ret < 0) {
1043 mutex_lock(&local->mtx);
1044 eth_zero_addr(sdata->u.mgd.tdls_peer);
1045 mutex_unlock(&local->mtx);
1046 return ret;
1047 }
1048
1049 ieee80211_queue_delayed_work(&sdata->local->hw,
1050 &sdata->u.mgd.tdls_peer_del_work,
1051 TDLS_PEER_SETUP_TIMEOUT);
1052 return 0;
1053
1054 out_unlock:
1055 mutex_unlock(&local->mtx);
1056 return ret;
1057 }
1058
1059 static int
1060 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1061 const u8 *peer, u8 action_code, u8 dialog_token,
1062 u16 status_code, u32 peer_capability,
1063 bool initiator, const u8 *extra_ies,
1064 size_t extra_ies_len)
1065 {
1066 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1067 struct ieee80211_local *local = sdata->local;
1068 struct sta_info *sta;
1069 int ret;
1070
1071 /*
1072 * No packets can be transmitted to the peer via the AP during setup -
1073 * the STA is set as a TDLS peer, but is not authorized.
1074 * During teardown, we prevent direct transmissions by stopping the
1075 * queues and flushing all direct packets.
1076 */
1077 ieee80211_stop_vif_queues(local, sdata,
1078 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1079 ieee80211_flush_queues(local, sdata, false);
1080
1081 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1082 dialog_token, status_code,
1083 peer_capability, initiator,
1084 extra_ies, extra_ies_len, 0,
1085 NULL);
1086 if (ret < 0)
1087 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1088 ret);
1089
1090 /*
1091 * Remove the STA AUTH flag to force further traffic through the AP. If
1092 * the STA was unreachable, it was already removed.
1093 */
1094 rcu_read_lock();
1095 sta = sta_info_get(sdata, peer);
1096 if (sta)
1097 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1098 rcu_read_unlock();
1099
1100 ieee80211_wake_vif_queues(local, sdata,
1101 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1102
1103 return 0;
1104 }
1105
1106 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1107 const u8 *peer, u8 action_code, u8 dialog_token,
1108 u16 status_code, u32 peer_capability,
1109 bool initiator, const u8 *extra_ies,
1110 size_t extra_ies_len)
1111 {
1112 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1113 int ret;
1114
1115 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1116 return -ENOTSUPP;
1117
1118 /* make sure we are in managed mode, and associated */
1119 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1120 !sdata->u.mgd.associated)
1121 return -EINVAL;
1122
1123 switch (action_code) {
1124 case WLAN_TDLS_SETUP_REQUEST:
1125 case WLAN_TDLS_SETUP_RESPONSE:
1126 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1127 dialog_token, status_code,
1128 peer_capability, initiator,
1129 extra_ies, extra_ies_len);
1130 break;
1131 case WLAN_TDLS_TEARDOWN:
1132 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1133 action_code, dialog_token,
1134 status_code,
1135 peer_capability, initiator,
1136 extra_ies, extra_ies_len);
1137 break;
1138 case WLAN_TDLS_DISCOVERY_REQUEST:
1139 /*
1140 * Protect the discovery so we can hear the TDLS discovery
1141 * response frame. It is transmitted directly and not buffered
1142 * by the AP.
1143 */
1144 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1145 /* fall-through */
1146 case WLAN_TDLS_SETUP_CONFIRM:
1147 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1148 /* no special handling */
1149 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1150 action_code,
1151 dialog_token,
1152 status_code,
1153 peer_capability,
1154 initiator, extra_ies,
1155 extra_ies_len, 0, NULL);
1156 break;
1157 default:
1158 ret = -EOPNOTSUPP;
1159 break;
1160 }
1161
1162 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1163 action_code, peer, ret);
1164 return ret;
1165 }
1166
1167 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1168 const u8 *peer, enum nl80211_tdls_operation oper)
1169 {
1170 struct sta_info *sta;
1171 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1172 struct ieee80211_local *local = sdata->local;
1173 int ret;
1174
1175 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1176 return -ENOTSUPP;
1177
1178 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1179 return -EINVAL;
1180
1181 switch (oper) {
1182 case NL80211_TDLS_ENABLE_LINK:
1183 case NL80211_TDLS_DISABLE_LINK:
1184 break;
1185 case NL80211_TDLS_TEARDOWN:
1186 case NL80211_TDLS_SETUP:
1187 case NL80211_TDLS_DISCOVERY_REQ:
1188 /* We don't support in-driver setup/teardown/discovery */
1189 return -ENOTSUPP;
1190 }
1191
1192 mutex_lock(&local->mtx);
1193 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1194
1195 switch (oper) {
1196 case NL80211_TDLS_ENABLE_LINK:
1197 rcu_read_lock();
1198 sta = sta_info_get(sdata, peer);
1199 if (!sta) {
1200 rcu_read_unlock();
1201 ret = -ENOLINK;
1202 break;
1203 }
1204
1205 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1206 rcu_read_unlock();
1207
1208 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1209 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1210 ret = 0;
1211 break;
1212 case NL80211_TDLS_DISABLE_LINK:
1213 /*
1214 * The teardown message in ieee80211_tdls_mgmt_teardown() was
1215 * created while the queues were stopped, so it might still be
1216 * pending. Before flushing the queues we need to be sure the
1217 * message is handled by the tasklet handling pending messages,
1218 * otherwise we might start destroying the station before
1219 * sending the teardown packet.
1220 * Note that this only forces the tasklet to flush pendings -
1221 * not to stop the tasklet from rescheduling itself.
1222 */
1223 tasklet_kill(&local->tx_pending_tasklet);
1224 /* flush a potentially queued teardown packet */
1225 ieee80211_flush_queues(local, sdata, false);
1226
1227 ret = sta_info_destroy_addr(sdata, peer);
1228 break;
1229 default:
1230 ret = -ENOTSUPP;
1231 break;
1232 }
1233
1234 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1235 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1236 eth_zero_addr(sdata->u.mgd.tdls_peer);
1237 }
1238
1239 mutex_unlock(&local->mtx);
1240 return ret;
1241 }
1242
1243 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1244 enum nl80211_tdls_operation oper,
1245 u16 reason_code, gfp_t gfp)
1246 {
1247 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1248
1249 if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1250 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1251 oper);
1252 return;
1253 }
1254
1255 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1256 }
1257 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1258
1259 static void
1260 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1261 {
1262 struct ieee80211_ch_switch_timing *ch_sw;
1263
1264 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1265 *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1266
1267 ch_sw = (void *)buf;
1268 ch_sw->switch_time = cpu_to_le16(switch_time);
1269 ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1270 }
1271
1272 /* find switch timing IE in SKB ready for Tx */
1273 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1274 {
1275 struct ieee80211_tdls_data *tf;
1276 const u8 *ie_start;
1277
1278 /*
1279 * Get the offset for the new location of the switch timing IE.
1280 * The SKB network header will now point to the "payload_type"
1281 * element of the TDLS data frame struct.
1282 */
1283 tf = container_of(skb->data + skb_network_offset(skb),
1284 struct ieee80211_tdls_data, payload_type);
1285 ie_start = tf->u.chan_switch_req.variable;
1286 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1287 skb->len - (ie_start - skb->data));
1288 }
1289
1290 static struct sk_buff *
1291 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1292 struct cfg80211_chan_def *chandef,
1293 u32 *ch_sw_tm_ie_offset)
1294 {
1295 struct ieee80211_sub_if_data *sdata = sta->sdata;
1296 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1297 2 + sizeof(struct ieee80211_ch_switch_timing)];
1298 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1299 u8 *pos = extra_ies;
1300 struct sk_buff *skb;
1301
1302 /*
1303 * if chandef points to a wide channel add a Secondary-Channel
1304 * Offset information element
1305 */
1306 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1307 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1308 bool ht40plus;
1309
1310 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1311 *pos++ = sizeof(*sec_chan_ie);
1312 sec_chan_ie = (void *)pos;
1313
1314 ht40plus = cfg80211_get_chandef_type(chandef) ==
1315 NL80211_CHAN_HT40PLUS;
1316 sec_chan_ie->sec_chan_offs = ht40plus ?
1317 IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1318 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1319 pos += sizeof(*sec_chan_ie);
1320
1321 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1322 }
1323
1324 /* just set the values to 0, this is a template */
1325 iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1326
1327 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1328 WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1329 0, 0, !sta->sta.tdls_initiator,
1330 extra_ies, extra_ies_len,
1331 oper_class, chandef);
1332 if (!skb)
1333 return NULL;
1334
1335 skb = ieee80211_build_data_template(sdata, skb, 0);
1336 if (IS_ERR(skb)) {
1337 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1338 return NULL;
1339 }
1340
1341 if (ch_sw_tm_ie_offset) {
1342 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1343
1344 if (!tm_ie) {
1345 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1346 dev_kfree_skb_any(skb);
1347 return NULL;
1348 }
1349
1350 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1351 }
1352
1353 tdls_dbg(sdata,
1354 "TDLS channel switch request template for %pM ch %d width %d\n",
1355 sta->sta.addr, chandef->chan->center_freq, chandef->width);
1356 return skb;
1357 }
1358
1359 int
1360 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1361 const u8 *addr, u8 oper_class,
1362 struct cfg80211_chan_def *chandef)
1363 {
1364 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1365 struct ieee80211_local *local = sdata->local;
1366 struct sta_info *sta;
1367 struct sk_buff *skb = NULL;
1368 u32 ch_sw_tm_ie;
1369 int ret;
1370
1371 mutex_lock(&local->sta_mtx);
1372 sta = sta_info_get(sdata, addr);
1373 if (!sta) {
1374 tdls_dbg(sdata,
1375 "Invalid TDLS peer %pM for channel switch request\n",
1376 addr);
1377 ret = -ENOENT;
1378 goto out;
1379 }
1380
1381 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1382 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1383 addr);
1384 ret = -ENOTSUPP;
1385 goto out;
1386 }
1387
1388 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1389 &ch_sw_tm_ie);
1390 if (!skb) {
1391 ret = -ENOENT;
1392 goto out;
1393 }
1394
1395 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1396 chandef, skb, ch_sw_tm_ie);
1397 if (!ret)
1398 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1399
1400 out:
1401 mutex_unlock(&local->sta_mtx);
1402 dev_kfree_skb_any(skb);
1403 return ret;
1404 }
1405
1406 void
1407 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1408 struct net_device *dev,
1409 const u8 *addr)
1410 {
1411 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1412 struct ieee80211_local *local = sdata->local;
1413 struct sta_info *sta;
1414
1415 mutex_lock(&local->sta_mtx);
1416 sta = sta_info_get(sdata, addr);
1417 if (!sta) {
1418 tdls_dbg(sdata,
1419 "Invalid TDLS peer %pM for channel switch cancel\n",
1420 addr);
1421 goto out;
1422 }
1423
1424 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1425 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1426 addr);
1427 goto out;
1428 }
1429
1430 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1431 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1432
1433 out:
1434 mutex_unlock(&local->sta_mtx);
1435 }
1436
1437 static struct sk_buff *
1438 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1439 u32 *ch_sw_tm_ie_offset)
1440 {
1441 struct ieee80211_sub_if_data *sdata = sta->sdata;
1442 struct sk_buff *skb;
1443 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1444
1445 /* initial timing are always zero in the template */
1446 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1447
1448 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1449 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1450 0, 0, !sta->sta.tdls_initiator,
1451 extra_ies, sizeof(extra_ies), 0, NULL);
1452 if (!skb)
1453 return NULL;
1454
1455 skb = ieee80211_build_data_template(sdata, skb, 0);
1456 if (IS_ERR(skb)) {
1457 tdls_dbg(sdata,
1458 "Failed building TDLS channel switch resp frame\n");
1459 return NULL;
1460 }
1461
1462 if (ch_sw_tm_ie_offset) {
1463 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1464
1465 if (!tm_ie) {
1466 tdls_dbg(sdata,
1467 "No switch timing IE in TDLS switch resp\n");
1468 dev_kfree_skb_any(skb);
1469 return NULL;
1470 }
1471
1472 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1473 }
1474
1475 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1476 sta->sta.addr);
1477 return skb;
1478 }
1479
1480 static int
1481 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1482 struct sk_buff *skb)
1483 {
1484 struct ieee80211_local *local = sdata->local;
1485 struct ieee802_11_elems elems;
1486 struct sta_info *sta;
1487 struct ieee80211_tdls_data *tf = (void *)skb->data;
1488 bool local_initiator;
1489 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1490 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1491 struct ieee80211_tdls_ch_sw_params params = {};
1492 int ret;
1493
1494 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1495 params.timestamp = rx_status->device_timestamp;
1496
1497 if (skb->len < baselen) {
1498 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1499 skb->len);
1500 return -EINVAL;
1501 }
1502
1503 mutex_lock(&local->sta_mtx);
1504 sta = sta_info_get(sdata, tf->sa);
1505 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1506 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1507 tf->sa);
1508 ret = -EINVAL;
1509 goto out;
1510 }
1511
1512 params.sta = &sta->sta;
1513 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1514 if (params.status != 0) {
1515 ret = 0;
1516 goto call_drv;
1517 }
1518
1519 ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1520 skb->len - baselen, false, &elems);
1521 if (elems.parse_error) {
1522 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1523 ret = -EINVAL;
1524 goto out;
1525 }
1526
1527 if (!elems.ch_sw_timing || !elems.lnk_id) {
1528 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1529 ret = -EINVAL;
1530 goto out;
1531 }
1532
1533 /* validate the initiator is set correctly */
1534 local_initiator =
1535 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1536 if (local_initiator == sta->sta.tdls_initiator) {
1537 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1538 ret = -EINVAL;
1539 goto out;
1540 }
1541
1542 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1543 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1544
1545 params.tmpl_skb =
1546 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1547 if (!params.tmpl_skb) {
1548 ret = -ENOENT;
1549 goto out;
1550 }
1551
1552 call_drv:
1553 drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1554
1555 tdls_dbg(sdata,
1556 "TDLS channel switch response received from %pM status %d\n",
1557 tf->sa, params.status);
1558
1559 out:
1560 mutex_unlock(&local->sta_mtx);
1561 dev_kfree_skb_any(params.tmpl_skb);
1562 return ret;
1563 }
1564
1565 static int
1566 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1567 struct sk_buff *skb)
1568 {
1569 struct ieee80211_local *local = sdata->local;
1570 struct ieee802_11_elems elems;
1571 struct cfg80211_chan_def chandef;
1572 struct ieee80211_channel *chan;
1573 enum nl80211_channel_type chan_type;
1574 int freq;
1575 u8 target_channel, oper_class;
1576 bool local_initiator;
1577 struct sta_info *sta;
1578 enum ieee80211_band band;
1579 struct ieee80211_tdls_data *tf = (void *)skb->data;
1580 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1581 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1582 struct ieee80211_tdls_ch_sw_params params = {};
1583 int ret = 0;
1584
1585 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1586 params.timestamp = rx_status->device_timestamp;
1587
1588 if (skb->len < baselen) {
1589 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1590 skb->len);
1591 return -EINVAL;
1592 }
1593
1594 target_channel = tf->u.chan_switch_req.target_channel;
1595 oper_class = tf->u.chan_switch_req.oper_class;
1596
1597 /*
1598 * We can't easily infer the channel band. The operating class is
1599 * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1600 * solution here is to treat channels with number >14 as 5GHz ones,
1601 * and specifically check for the (oper_class, channel) combinations
1602 * where this doesn't hold. These are thankfully unique according to
1603 * IEEE802.11-2012.
1604 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1605 * valid here.
1606 */
1607 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1608 oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1609 target_channel < 14)
1610 band = IEEE80211_BAND_5GHZ;
1611 else
1612 band = target_channel < 14 ? IEEE80211_BAND_2GHZ :
1613 IEEE80211_BAND_5GHZ;
1614
1615 freq = ieee80211_channel_to_frequency(target_channel, band);
1616 if (freq == 0) {
1617 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1618 target_channel);
1619 return -EINVAL;
1620 }
1621
1622 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1623 if (!chan) {
1624 tdls_dbg(sdata,
1625 "Unsupported channel for TDLS chan switch: %d\n",
1626 target_channel);
1627 return -EINVAL;
1628 }
1629
1630 ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1631 skb->len - baselen, false, &elems);
1632 if (elems.parse_error) {
1633 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1634 return -EINVAL;
1635 }
1636
1637 if (!elems.ch_sw_timing || !elems.lnk_id) {
1638 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1639 return -EINVAL;
1640 }
1641
1642 mutex_lock(&local->sta_mtx);
1643 sta = sta_info_get(sdata, tf->sa);
1644 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1645 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1646 tf->sa);
1647 ret = -EINVAL;
1648 goto out;
1649 }
1650
1651 params.sta = &sta->sta;
1652
1653 /* validate the initiator is set correctly */
1654 local_initiator =
1655 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1656 if (local_initiator == sta->sta.tdls_initiator) {
1657 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1658 ret = -EINVAL;
1659 goto out;
1660 }
1661
1662 if (!sta->sta.ht_cap.ht_supported) {
1663 chan_type = NL80211_CHAN_NO_HT;
1664 } else if (!elems.sec_chan_offs) {
1665 chan_type = NL80211_CHAN_HT20;
1666 } else {
1667 switch (elems.sec_chan_offs->sec_chan_offs) {
1668 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1669 chan_type = NL80211_CHAN_HT40PLUS;
1670 break;
1671 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1672 chan_type = NL80211_CHAN_HT40MINUS;
1673 break;
1674 default:
1675 chan_type = NL80211_CHAN_HT20;
1676 break;
1677 }
1678 }
1679
1680 cfg80211_chandef_create(&chandef, chan, chan_type);
1681 params.chandef = &chandef;
1682
1683 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1684 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1685
1686 params.tmpl_skb =
1687 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1688 &params.ch_sw_tm_ie);
1689 if (!params.tmpl_skb) {
1690 ret = -ENOENT;
1691 goto out;
1692 }
1693
1694 drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1695
1696 tdls_dbg(sdata,
1697 "TDLS ch switch request received from %pM ch %d width %d\n",
1698 tf->sa, params.chandef->chan->center_freq,
1699 params.chandef->width);
1700 out:
1701 mutex_unlock(&local->sta_mtx);
1702 dev_kfree_skb_any(params.tmpl_skb);
1703 return ret;
1704 }
1705
1706 void ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1707 struct sk_buff *skb)
1708 {
1709 struct ieee80211_tdls_data *tf = (void *)skb->data;
1710 struct wiphy *wiphy = sdata->local->hw.wiphy;
1711
1712 /* make sure the driver supports it */
1713 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1714 return;
1715
1716 /* we want to access the entire packet */
1717 if (skb_linearize(skb))
1718 return;
1719 /*
1720 * The packet/size was already validated by mac80211 Rx path, only look
1721 * at the action type.
1722 */
1723 switch (tf->action_code) {
1724 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1725 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1726 break;
1727 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1728 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1729 break;
1730 default:
1731 WARN_ON_ONCE(1);
1732 return;
1733 }
1734 }
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