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mac80211: add VHT support for IBSS
[deliverable/linux.git] / net / mac80211 / tdls.c
CommitLineData
95224fe8
AN		 1/*
2 * mac80211 TDLS handling code
3 *
4 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
5 * Copyright 2014, Intel Corporation
d98ad83e 6 * Copyright 2014 Intel Mobile Communications GmbH
95224fe8
AN		 7 *
8 * This file is GPLv2 as found in COPYING.
9 */
10
11#include <linux/ieee80211.h>
6f7eaa47 12#include <linux/log2.h>
c887f0d3 13#include <net/cfg80211.h>
95224fe8 14#include "ieee80211_i.h"
ee10f2c7 15#include "driver-ops.h"
95224fe8 16
17e6a59a
AN		 17/* give usermode some time for retries in setting up the TDLS session */
18#define TDLS_PEER_SETUP_TIMEOUT (15 * HZ)
19
20void 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,
81dd2b88 26 u.mgd.tdls_peer_del_work.work);
17e6a59a
AN		 27 local = sdata->local;
28
29 mutex_lock(&local->mtx);
81dd2b88
AN		 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);
17e6a59a
AN		 34 }
35 mutex_unlock(&local->mtx);
36}
37
78632a17
AN		 38static void ieee80211_tdls_add_ext_capab(struct ieee80211_local *local,
39 struct sk_buff *skb)
95224fe8
AN		 40{
41 u8 *pos = (void *)skb_put(skb, 7);
78632a17
AN		 42 bool chan_switch = local->hw.wiphy->features &
43 NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
95224fe8
AN		 44
45 *pos++ = WLAN_EID_EXT_CAPABILITY;
46 *pos++ = 5; /* len */
47 *pos++ = 0x0;
48 *pos++ = 0x0;
49 *pos++ = 0x0;
78632a17 50 *pos++ = chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0;
95224fe8
AN		 51 *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
52}
53
f0d29cb9
AN		 54static u8
55ieee80211_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 */
f0d29cb9 71 cfg80211_chandef_create(&chandef, ch,
50075892
AN		 72 NL80211_CHAN_NO_HT);
73 if (cfg80211_reg_can_beacon(sdata->local->hw.wiphy,
74 &chandef,
75 sdata->wdev.iftype)) {
f0d29cb9 76 ch_cnt++;
50075892
AN		 77 /*
78 * check if the next channel is also part of
79 * this allowed range
80 */
f0d29cb9
AN		 81 continue;
82 }
83 }
84
50075892
AN		 85 /*
86 * we've reached the end of a range, with allowed channels
87 * found
88 */
f0d29cb9
AN		 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
50075892
AN		 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
f0d29cb9
AN		 108 return subband_cnt;
109}
110
111static void
112ieee80211_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
a38700dd
AN		 139static 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
2cedd879
AN		 157static 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
dd8c0b03
AN		 167static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
168 u16 status_code)
95224fe8
AN		 169{
170 struct ieee80211_local *local = sdata->local;
171 u16 capab;
172
dd8c0b03
AN		 173 /* The capability will be 0 when sending a failure code */
174 if (status_code != 0)
175 return 0;
176
95224fe8
AN		 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
1606ef4a
AN		 189static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
190 struct sk_buff *skb, const u8 *peer,
191 bool initiator)
95224fe8
AN		 192{
193 struct ieee80211_tdls_lnkie *lnkid;
1606ef4a
AN		 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 }
95224fe8
AN		 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
1606ef4a
AN		 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);
95224fe8
AN		 212}
213
fb28ec0c
AN		 214static void
215ieee80211_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
6f7eaa47
AN		 225/* translate numbering in the WMM parameter IE to the mac80211 notation */
226static 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
242static 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
253static 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
259static 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
f09a87d2
AN		 293static void
294ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
295 struct sk_buff *skb, const u8 *peer,
1606ef4a
AN		 296 u8 action_code, bool initiator,
297 const u8 *extra_ies, size_t extra_ies_len)
f09a87d2
AN		 298{
299 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
40b861a0 300 struct ieee80211_local *local = sdata->local;
13cc8a4a
AN		 301 struct ieee80211_supported_band *sband;
302 struct ieee80211_sta_ht_cap ht_cap;
fb28ec0c 303 struct ieee80211_sta_vht_cap vht_cap;
13cc8a4a 304 struct sta_info *sta = NULL;
f09a87d2
AN		 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);
f0d29cb9 310 ieee80211_tdls_add_supp_channels(sdata, skb);
f09a87d2
AN		 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
78632a17 330 ieee80211_tdls_add_ext_capab(local, skb);
f09a87d2 331
40b861a0
AN		 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
f09a87d2
AN		 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
ae2e9fba
AN		 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
a38700dd
AN		 371 ieee80211_tdls_add_oper_classes(sdata, skb);
372
13cc8a4a
AN		 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));
c5309ba7
JB		 380
381 if (action_code == WLAN_TDLS_SETUP_REQUEST && ht_cap.ht_supported) {
382 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
383
384 /* disable SMPS in TDLS initiator */
385 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
386 << IEEE80211_HT_CAP_SM_PS_SHIFT;
387
388 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
389 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
390 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
391 ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
392 /* disable SMPS in TDLS responder */
393 sta->sta.ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
394 << IEEE80211_HT_CAP_SM_PS_SHIFT;
395
396 /* the peer caps are already intersected with our own */
397 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
13cc8a4a
AN		 398
399 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
400 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
401 }
402
2cedd879
AN		 403 if (ht_cap.ht_supported &&
404 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
405 ieee80211_tdls_add_bss_coex_ie(skb);
406
fb28ec0c
AN		 407 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
408
409 /* add any custom IEs that go before VHT capabilities */
410 if (extra_ies_len) {
411 static const u8 before_vht_cap[] = {
412 WLAN_EID_SUPP_RATES,
413 WLAN_EID_COUNTRY,
414 WLAN_EID_EXT_SUPP_RATES,
415 WLAN_EID_SUPPORTED_CHANNELS,
416 WLAN_EID_RSN,
417 WLAN_EID_EXT_CAPABILITY,
418 WLAN_EID_QOS_CAPA,
419 WLAN_EID_FAST_BSS_TRANSITION,
420 WLAN_EID_TIMEOUT_INTERVAL,
421 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
422 WLAN_EID_MULTI_BAND,
423 };
424 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
425 before_vht_cap,
426 ARRAY_SIZE(before_vht_cap),
427 offset);
428 pos = skb_put(skb, noffset - offset);
429 memcpy(pos, extra_ies + offset, noffset - offset);
430 offset = noffset;
431 }
432
433 /* build the VHT-cap similarly to the HT-cap */
434 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
435 if (action_code == WLAN_TDLS_SETUP_REQUEST && vht_cap.vht_supported) {
436 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
437
438 /* the AID is present only when VHT is implemented */
439 ieee80211_tdls_add_aid(sdata, skb);
440
441 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
442 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
443 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
444 vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
445 /* the peer caps are already intersected with our own */
446 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
447
448 /* the AID is present only when VHT is implemented */
449 ieee80211_tdls_add_aid(sdata, skb);
450
451 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
452 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
453 }
454
455 rcu_read_unlock();
456
f09a87d2
AN		 457 /* add any remaining IEs */
458 if (extra_ies_len) {
459 noffset = extra_ies_len;
460 pos = skb_put(skb, noffset - offset);
461 memcpy(pos, extra_ies + offset, noffset - offset);
462 }
1606ef4a 463
f09a87d2
AN		 464}
465
6f7eaa47
AN		 466static void
467ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
468 struct sk_buff *skb, const u8 *peer,
469 bool initiator, const u8 *extra_ies,
470 size_t extra_ies_len)
471{
472 struct ieee80211_local *local = sdata->local;
13cc8a4a 473 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
6f7eaa47 474 size_t offset = 0, noffset;
13cc8a4a 475 struct sta_info *sta, *ap_sta;
fb28ec0c 476 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
6f7eaa47
AN		 477 u8 *pos;
478
479 rcu_read_lock();
480
481 sta = sta_info_get(sdata, peer);
13cc8a4a
AN		 482 ap_sta = sta_info_get(sdata, ifmgd->bssid);
483 if (WARN_ON_ONCE(!sta || !ap_sta)) {
6f7eaa47
AN		 484 rcu_read_unlock();
485 return;
486 }
487
488 /* add any custom IEs that go before the QoS IE */
489 if (extra_ies_len) {
490 static const u8 before_qos[] = {
491 WLAN_EID_RSN,
492 };
493 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
494 before_qos,
495 ARRAY_SIZE(before_qos),
496 offset);
497 pos = skb_put(skb, noffset - offset);
498 memcpy(pos, extra_ies + offset, noffset - offset);
499 offset = noffset;
500 }
501
502 /* add the QoS param IE if both the peer and we support it */
a74a8c84 503 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
6f7eaa47
AN		 504 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
505
13cc8a4a
AN		 506 /* add any custom IEs that go before HT operation */
507 if (extra_ies_len) {
508 static const u8 before_ht_op[] = {
509 WLAN_EID_RSN,
510 WLAN_EID_QOS_CAPA,
511 WLAN_EID_FAST_BSS_TRANSITION,
512 WLAN_EID_TIMEOUT_INTERVAL,
513 };
514 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
515 before_ht_op,
516 ARRAY_SIZE(before_ht_op),
517 offset);
518 pos = skb_put(skb, noffset - offset);
519 memcpy(pos, extra_ies + offset, noffset - offset);
520 offset = noffset;
521 }
522
523 /* if HT support is only added in TDLS, we need an HT-operation IE */
524 if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
525 struct ieee80211_chanctx_conf *chanctx_conf =
526 rcu_dereference(sdata->vif.chanctx_conf);
527 if (!WARN_ON(!chanctx_conf)) {
528 pos = skb_put(skb, 2 +
529 sizeof(struct ieee80211_ht_operation));
530 /* send an empty HT operation IE */
531 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
532 &chanctx_conf->def, 0);
533 }
534 }
535
fb28ec0c
AN		 536 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
537
538 /* only include VHT-operation if not on the 2.4GHz band */
539 if (band != IEEE80211_BAND_2GHZ && !ap_sta->sta.vht_cap.vht_supported &&
540 sta->sta.vht_cap.vht_supported) {
541 struct ieee80211_chanctx_conf *chanctx_conf =
542 rcu_dereference(sdata->vif.chanctx_conf);
543 if (!WARN_ON(!chanctx_conf)) {
544 pos = skb_put(skb, 2 +
545 sizeof(struct ieee80211_vht_operation));
546 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
547 &chanctx_conf->def);
548 }
549 }
550
13cc8a4a
AN		 551 rcu_read_unlock();
552
6f7eaa47
AN		 553 /* add any remaining IEs */
554 if (extra_ies_len) {
555 noffset = extra_ies_len;
556 pos = skb_put(skb, noffset - offset);
557 memcpy(pos, extra_ies + offset, noffset - offset);
558 }
6f7eaa47
AN		 559}
560
a7a6bdd0
AN		 561static void
562ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
563 struct sk_buff *skb, const u8 *peer,
564 bool initiator, const u8 *extra_ies,
565 size_t extra_ies_len, u8 oper_class,
566 struct cfg80211_chan_def *chandef)
567{
568 struct ieee80211_tdls_data *tf;
569 size_t offset = 0, noffset;
570 u8 *pos;
571
572 if (WARN_ON_ONCE(!chandef))
573 return;
574
575 tf = (void *)skb->data;
576 tf->u.chan_switch_req.target_channel =
577 ieee80211_frequency_to_channel(chandef->chan->center_freq);
578 tf->u.chan_switch_req.oper_class = oper_class;
579
580 if (extra_ies_len) {
581 static const u8 before_lnkie[] = {
582 WLAN_EID_SECONDARY_CHANNEL_OFFSET,
583 };
584 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
585 before_lnkie,
586 ARRAY_SIZE(before_lnkie),
587 offset);
588 pos = skb_put(skb, noffset - offset);
589 memcpy(pos, extra_ies + offset, noffset - offset);
590 offset = noffset;
591 }
592
593 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
594
595 /* add any remaining IEs */
596 if (extra_ies_len) {
597 noffset = extra_ies_len;
598 pos = skb_put(skb, noffset - offset);
599 memcpy(pos, extra_ies + offset, noffset - offset);
600 }
601}
602
8a4d32f3
AN		 603static void
604ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
605 struct sk_buff *skb, const u8 *peer,
606 u16 status_code, bool initiator,
607 const u8 *extra_ies,
608 size_t extra_ies_len)
609{
610 if (status_code == 0)
611 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
612
613 if (extra_ies_len)
614 memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
615}
616
46792a2d
AN		 617static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
618 struct sk_buff *skb, const u8 *peer,
1606ef4a
AN		 619 u8 action_code, u16 status_code,
620 bool initiator, const u8 *extra_ies,
c2733905
AN		 621 size_t extra_ies_len, u8 oper_class,
622 struct cfg80211_chan_def *chandef)
46792a2d 623{
46792a2d
AN		 624 switch (action_code) {
625 case WLAN_TDLS_SETUP_REQUEST:
626 case WLAN_TDLS_SETUP_RESPONSE:
627 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1606ef4a
AN		 628 if (status_code == 0)
629 ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
630 action_code,
631 initiator,
632 extra_ies,
633 extra_ies_len);
46792a2d
AN		 634 break;
635 case WLAN_TDLS_SETUP_CONFIRM:
6f7eaa47
AN		 636 if (status_code == 0)
637 ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
638 initiator, extra_ies,
639 extra_ies_len);
640 break;
46792a2d
AN		 641 case WLAN_TDLS_TEARDOWN:
642 case WLAN_TDLS_DISCOVERY_REQUEST:
f09a87d2
AN		 643 if (extra_ies_len)
644 memcpy(skb_put(skb, extra_ies_len), extra_ies,
645 extra_ies_len);
1606ef4a
AN		 646 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
647 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
46792a2d 648 break;
a7a6bdd0
AN		 649 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
650 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
651 initiator, extra_ies,
652 extra_ies_len,
653 oper_class, chandef);
654 break;
8a4d32f3
AN		 655 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
656 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
657 status_code,
658 initiator, extra_ies,
659 extra_ies_len);
660 break;
46792a2d
AN		 661 }
662
46792a2d
AN		 663}
664
95224fe8
AN		 665static int
666ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
3b3a0162 667 const u8 *peer, u8 action_code, u8 dialog_token,
95224fe8
AN		 668 u16 status_code, struct sk_buff *skb)
669{
670 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
95224fe8
AN		 671 struct ieee80211_tdls_data *tf;
672
673 tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
674
675 memcpy(tf->da, peer, ETH_ALEN);
676 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
677 tf->ether_type = cpu_to_be16(ETH_P_TDLS);
678 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
679
59cd85cb
AN		 680 /* network header is after the ethernet header */
681 skb_set_network_header(skb, ETH_HLEN);
682
95224fe8
AN		 683 switch (action_code) {
684 case WLAN_TDLS_SETUP_REQUEST:
685 tf->category = WLAN_CATEGORY_TDLS;
686 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
687
688 skb_put(skb, sizeof(tf->u.setup_req));
689 tf->u.setup_req.dialog_token = dialog_token;
690 tf->u.setup_req.capability =
dd8c0b03
AN		 691 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
692 status_code));
95224fe8
AN		 693 break;
694 case WLAN_TDLS_SETUP_RESPONSE:
695 tf->category = WLAN_CATEGORY_TDLS;
696 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
697
698 skb_put(skb, sizeof(tf->u.setup_resp));
699 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
700 tf->u.setup_resp.dialog_token = dialog_token;
701 tf->u.setup_resp.capability =
dd8c0b03
AN		 702 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
703 status_code));
95224fe8
AN		 704 break;
705 case WLAN_TDLS_SETUP_CONFIRM:
706 tf->category = WLAN_CATEGORY_TDLS;
707 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
708
709 skb_put(skb, sizeof(tf->u.setup_cfm));
710 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
711 tf->u.setup_cfm.dialog_token = dialog_token;
712 break;
713 case WLAN_TDLS_TEARDOWN:
714 tf->category = WLAN_CATEGORY_TDLS;
715 tf->action_code = WLAN_TDLS_TEARDOWN;
716
717 skb_put(skb, sizeof(tf->u.teardown));
718 tf->u.teardown.reason_code = cpu_to_le16(status_code);
719 break;
720 case WLAN_TDLS_DISCOVERY_REQUEST:
721 tf->category = WLAN_CATEGORY_TDLS;
722 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
723
724 skb_put(skb, sizeof(tf->u.discover_req));
725 tf->u.discover_req.dialog_token = dialog_token;
726 break;
a7a6bdd0
AN		 727 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
728 tf->category = WLAN_CATEGORY_TDLS;
729 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
730
731 skb_put(skb, sizeof(tf->u.chan_switch_req));
732 break;
8a4d32f3
AN		 733 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
734 tf->category = WLAN_CATEGORY_TDLS;
735 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
736
737 skb_put(skb, sizeof(tf->u.chan_switch_resp));
738 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
739 break;
95224fe8
AN		 740 default:
741 return -EINVAL;
742 }
743
744 return 0;
745}
746
747static int
748ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
3b3a0162 749 const u8 *peer, u8 action_code, u8 dialog_token,
95224fe8
AN		 750 u16 status_code, struct sk_buff *skb)
751{
752 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
95224fe8
AN		 753 struct ieee80211_mgmt *mgmt;
754
755 mgmt = (void *)skb_put(skb, 24);
756 memset(mgmt, 0, 24);
757 memcpy(mgmt->da, peer, ETH_ALEN);
758 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
759 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
760
761 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
762 IEEE80211_STYPE_ACTION);
763
764 switch (action_code) {
765 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
766 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
767 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
768 mgmt->u.action.u.tdls_discover_resp.action_code =
769 WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
770 mgmt->u.action.u.tdls_discover_resp.dialog_token =
771 dialog_token;
772 mgmt->u.action.u.tdls_discover_resp.capability =
dd8c0b03
AN		 773 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
774 status_code));
95224fe8
AN		 775 break;
776 default:
777 return -EINVAL;
778 }
779
780 return 0;
781}
782
c2733905
AN		 783static struct sk_buff *
784ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
785 const u8 *peer, u8 action_code,
786 u8 dialog_token, u16 status_code,
787 bool initiator, const u8 *extra_ies,
788 size_t extra_ies_len, u8 oper_class,
789 struct cfg80211_chan_def *chandef)
95224fe8 790{
95224fe8 791 struct ieee80211_local *local = sdata->local;
c2733905 792 struct sk_buff *skb;
95224fe8
AN		 793 int ret;
794
c2733905 795 skb = netdev_alloc_skb(sdata->dev,
1277b4a9
LK		 796 local->hw.extra_tx_headroom +
797 max(sizeof(struct ieee80211_mgmt),
798 sizeof(struct ieee80211_tdls_data)) +
799 50 + /* supported rates */
800 7 + /* ext capab */
801 26 + /* max(WMM-info, WMM-param) */
802 2 + max(sizeof(struct ieee80211_ht_cap),
803 sizeof(struct ieee80211_ht_operation)) +
fb28ec0c
AN		 804 2 + max(sizeof(struct ieee80211_vht_cap),
805 sizeof(struct ieee80211_vht_operation)) +
f0d29cb9 806 50 + /* supported channels */
2cedd879 807 3 + /* 40/20 BSS coex */
fb28ec0c 808 4 + /* AID */
a38700dd 809 4 + /* oper classes */
1277b4a9
LK		 810 extra_ies_len +
811 sizeof(struct ieee80211_tdls_lnkie));
95224fe8 812 if (!skb)
c2733905 813 return NULL;
95224fe8
AN		 814
815 skb_reserve(skb, local->hw.extra_tx_headroom);
816
817 switch (action_code) {
818 case WLAN_TDLS_SETUP_REQUEST:
819 case WLAN_TDLS_SETUP_RESPONSE:
820 case WLAN_TDLS_SETUP_CONFIRM:
821 case WLAN_TDLS_TEARDOWN:
822 case WLAN_TDLS_DISCOVERY_REQUEST:
a7a6bdd0 823 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
8a4d32f3 824 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
c2733905
AN		 825 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
826 sdata->dev, peer,
95224fe8
AN		 827 action_code, dialog_token,
828 status_code, skb);
95224fe8
AN		 829 break;
830 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
c2733905
AN		 831 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
832 peer, action_code,
95224fe8
AN		 833 dialog_token, status_code,
834 skb);
95224fe8
AN		 835 break;
836 default:
837 ret = -ENOTSUPP;
838 break;
839 }
840
841 if (ret < 0)
842 goto fail;
843
c2733905
AN		 844 ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
845 initiator, extra_ies, extra_ies_len, oper_class,
846 chandef);
847 return skb;
848
849fail:
850 dev_kfree_skb(skb);
851 return NULL;
852}
853
854static int
855ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
856 const u8 *peer, u8 action_code, u8 dialog_token,
857 u16 status_code, u32 peer_capability,
858 bool initiator, const u8 *extra_ies,
859 size_t extra_ies_len, u8 oper_class,
860 struct cfg80211_chan_def *chandef)
861{
862 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
863 struct sk_buff *skb = NULL;
864 struct sta_info *sta;
865 u32 flags = 0;
866 int ret = 0;
867
626911cc
AN		 868 rcu_read_lock();
869 sta = sta_info_get(sdata, peer);
870
871 /* infer the initiator if we can, to support old userspace */
95224fe8
AN		 872 switch (action_code) {
873 case WLAN_TDLS_SETUP_REQUEST:
8b94148c 874 if (sta) {
626911cc 875 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
8b94148c
AN		 876 sta->sta.tdls_initiator = false;
877 }
626911cc 878 /* fall-through */
95224fe8 879 case WLAN_TDLS_SETUP_CONFIRM:
95224fe8 880 case WLAN_TDLS_DISCOVERY_REQUEST:
626911cc 881 initiator = true;
95224fe8
AN		 882 break;
883 case WLAN_TDLS_SETUP_RESPONSE:
626911cc
AN		 884 /*
885 * In some testing scenarios, we send a request and response.
886 * Make the last packet sent take effect for the initiator
887 * value.
888 */
8b94148c 889 if (sta) {
626911cc 890 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
8b94148c
AN		 891 sta->sta.tdls_initiator = true;
892 }
626911cc 893 /* fall-through */
95224fe8 894 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
626911cc 895 initiator = false;
2fb6b9b8
AN		 896 break;
897 case WLAN_TDLS_TEARDOWN:
a7a6bdd0 898 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
8a4d32f3 899 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
2fb6b9b8 900 /* any value is ok */
95224fe8
AN		 901 break;
902 default:
903 ret = -ENOTSUPP;
626911cc 904 break;
95224fe8
AN		 905 }
906
46792a2d
AN		 907 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
908 initiator = true;
2fb6b9b8 909
626911cc
AN		 910 rcu_read_unlock();
911 if (ret < 0)
912 goto fail;
913
c2733905
AN		 914 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
915 dialog_token, status_code,
916 initiator, extra_ies,
917 extra_ies_len, oper_class,
918 chandef);
919 if (!skb) {
920 ret = -EINVAL;
921 goto fail;
922 }
923
924 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
95224fe8
AN		 925 ieee80211_tx_skb(sdata, skb);
926 return 0;
927 }
928
929 /*
930 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
931 * we should default to AC_VI.
932 */
933 switch (action_code) {
934 case WLAN_TDLS_SETUP_REQUEST:
935 case WLAN_TDLS_SETUP_RESPONSE:
936 skb_set_queue_mapping(skb, IEEE80211_AC_BK);
937 skb->priority = 2;
938 break;
939 default:
940 skb_set_queue_mapping(skb, IEEE80211_AC_VI);
941 skb->priority = 5;
942 break;
943 }
944
1277b4a9
LK		 945 /*
946 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
947 * Later, if no ACK is returned from peer, we will re-send the teardown
948 * packet through the AP.
949 */
950 if ((action_code == WLAN_TDLS_TEARDOWN) &&
c2733905 951 (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
1277b4a9
LK		 952 bool try_resend; /* Should we keep skb for possible resend */
953
954 /* If not sending directly to peer - no point in keeping skb */
955 rcu_read_lock();
956 sta = sta_info_get(sdata, peer);
957 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
958 rcu_read_unlock();
959
960 spin_lock_bh(&sdata->u.mgd.teardown_lock);
961 if (try_resend && !sdata->u.mgd.teardown_skb) {
962 /* Mark it as requiring TX status callback */
963 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
964 IEEE80211_TX_INTFL_MLME_CONN_TX;
965
966 /*
967 * skb is copied since mac80211 will later set
968 * properties that might not be the same as the AP,
969 * such as encryption, QoS, addresses, etc.
970 *
971 * No problem if skb_copy() fails, so no need to check.
972 */
973 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
974 sdata->u.mgd.orig_teardown_skb = skb;
975 }
976 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
977 }
978
95224fe8
AN		 979 /* disable bottom halves when entering the Tx path */
980 local_bh_disable();
1277b4a9 981 __ieee80211_subif_start_xmit(skb, dev, flags);
95224fe8
AN		 982 local_bh_enable();
983
984 return ret;
985
986fail:
987 dev_kfree_skb(skb);
988 return ret;
989}
990
191dd469
AN		 991static int
992ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
993 const u8 *peer, u8 action_code, u8 dialog_token,
994 u16 status_code, u32 peer_capability, bool initiator,
995 const u8 *extra_ies, size_t extra_ies_len)
17e6a59a
AN		 996{
997 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
998 struct ieee80211_local *local = sdata->local;
999 int ret;
1000
17e6a59a
AN		 1001 mutex_lock(&local->mtx);
1002
1003 /* we don't support concurrent TDLS peer setups */
81dd2b88
AN		 1004 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1005 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
17e6a59a 1006 ret = -EBUSY;
ae2e9fba 1007 goto out_unlock;
17e6a59a
AN		 1008 }
1009
7adc3e46
AN		 1010 /*
1011 * make sure we have a STA representing the peer so we drop or buffer
1012 * non-TDLS-setup frames to the peer. We can't send other packets
6ae32e5d
AN		 1013 * during setup through the AP path.
1014 * Allow error packets to be sent - sometimes we don't even add a STA
1015 * before failing the setup.
7adc3e46 1016 */
6ae32e5d
AN		 1017 if (status_code == 0) {
1018 rcu_read_lock();
1019 if (!sta_info_get(sdata, peer)) {
1020 rcu_read_unlock();
1021 ret = -ENOLINK;
ae2e9fba 1022 goto out_unlock;
6ae32e5d 1023 }
7adc3e46 1024 rcu_read_unlock();
7adc3e46 1025 }
7adc3e46 1026
3b24f4c6 1027 ieee80211_flush_queues(local, sdata, false);
ae2e9fba
AN		 1028 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1029 mutex_unlock(&local->mtx);
db67d661 1030
ae2e9fba 1031 /* we cannot take the mutex while preparing the setup packet */
17e6a59a
AN		 1032 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1033 dialog_token, status_code,
2fb6b9b8 1034 peer_capability, initiator,
c2733905
AN		 1035 extra_ies, extra_ies_len, 0,
1036 NULL);
ae2e9fba
AN		 1037 if (ret < 0) {
1038 mutex_lock(&local->mtx);
1039 eth_zero_addr(sdata->u.mgd.tdls_peer);
1040 mutex_unlock(&local->mtx);
1041 return ret;
1042 }
17e6a59a 1043
191dd469 1044 ieee80211_queue_delayed_work(&sdata->local->hw,
81dd2b88 1045 &sdata->u.mgd.tdls_peer_del_work,
191dd469 1046 TDLS_PEER_SETUP_TIMEOUT);
ae2e9fba 1047 return 0;
17e6a59a 1048
ae2e9fba 1049out_unlock:
17e6a59a 1050 mutex_unlock(&local->mtx);
191dd469
AN		 1051 return ret;
1052}
1053
db67d661
AN		 1054static int
1055ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1056 const u8 *peer, u8 action_code, u8 dialog_token,
1057 u16 status_code, u32 peer_capability,
1058 bool initiator, const u8 *extra_ies,
1059 size_t extra_ies_len)
1060{
1061 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1062 struct ieee80211_local *local = sdata->local;
1063 struct sta_info *sta;
1064 int ret;
1065
1066 /*
1067 * No packets can be transmitted to the peer via the AP during setup -
1068 * the STA is set as a TDLS peer, but is not authorized.
1069 * During teardown, we prevent direct transmissions by stopping the
1070 * queues and flushing all direct packets.
1071 */
1072 ieee80211_stop_vif_queues(local, sdata,
1073 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
3b24f4c6 1074 ieee80211_flush_queues(local, sdata, false);
db67d661
AN		 1075
1076 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1077 dialog_token, status_code,
1078 peer_capability, initiator,
c2733905
AN		 1079 extra_ies, extra_ies_len, 0,
1080 NULL);
db67d661
AN		 1081 if (ret < 0)
1082 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1083 ret);
1084
1085 /*
1086 * Remove the STA AUTH flag to force further traffic through the AP. If
1087 * the STA was unreachable, it was already removed.
1088 */
1089 rcu_read_lock();
1090 sta = sta_info_get(sdata, peer);
1091 if (sta)
1092 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1093 rcu_read_unlock();
1094
1095 ieee80211_wake_vif_queues(local, sdata,
1096 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1097
1098 return 0;
1099}
1100
191dd469
AN		 1101int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1102 const u8 *peer, u8 action_code, u8 dialog_token,
1103 u16 status_code, u32 peer_capability,
1104 bool initiator, const u8 *extra_ies,
1105 size_t extra_ies_len)
1106{
1107 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1108 int ret;
1109
1110 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1111 return -ENOTSUPP;
1112
1113 /* make sure we are in managed mode, and associated */
1114 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1115 !sdata->u.mgd.associated)
1116 return -EINVAL;
1117
1118 switch (action_code) {
1119 case WLAN_TDLS_SETUP_REQUEST:
1120 case WLAN_TDLS_SETUP_RESPONSE:
1121 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1122 dialog_token, status_code,
1123 peer_capability, initiator,
1124 extra_ies, extra_ies_len);
1125 break;
1126 case WLAN_TDLS_TEARDOWN:
db67d661
AN		 1127 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1128 action_code, dialog_token,
1129 status_code,
1130 peer_capability, initiator,
1131 extra_ies, extra_ies_len);
1132 break;
191dd469 1133 case WLAN_TDLS_DISCOVERY_REQUEST:
ee10f2c7
AN		 1134 /*
1135 * Protect the discovery so we can hear the TDLS discovery
1136 * response frame. It is transmitted directly and not buffered
1137 * by the AP.
1138 */
1139 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1140 /* fall-through */
1141 case WLAN_TDLS_SETUP_CONFIRM:
191dd469
AN		 1142 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1143 /* no special handling */
1144 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1145 action_code,
1146 dialog_token,
1147 status_code,
1148 peer_capability,
1149 initiator, extra_ies,
c2733905 1150 extra_ies_len, 0, NULL);
191dd469
AN		 1151 break;
1152 default:
1153 ret = -EOPNOTSUPP;
1154 break;
1155 }
17e6a59a
AN		 1156
1157 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1158 action_code, peer, ret);
1159 return ret;
1160}
1161
95224fe8 1162int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
3b3a0162 1163 const u8 *peer, enum nl80211_tdls_operation oper)
95224fe8
AN		 1164{
1165 struct sta_info *sta;
1166 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
17e6a59a
AN		 1167 struct ieee80211_local *local = sdata->local;
1168 int ret;
95224fe8
AN		 1169
1170 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1171 return -ENOTSUPP;
1172
1173 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1174 return -EINVAL;
1175
17e6a59a
AN		 1176 switch (oper) {
1177 case NL80211_TDLS_ENABLE_LINK:
1178 case NL80211_TDLS_DISABLE_LINK:
1179 break;
1180 case NL80211_TDLS_TEARDOWN:
1181 case NL80211_TDLS_SETUP:
1182 case NL80211_TDLS_DISCOVERY_REQ:
1183 /* We don't support in-driver setup/teardown/discovery */
1184 return -ENOTSUPP;
1185 }
1186
1187 mutex_lock(&local->mtx);
95224fe8
AN		 1188 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1189
1190 switch (oper) {
1191 case NL80211_TDLS_ENABLE_LINK:
1192 rcu_read_lock();
1193 sta = sta_info_get(sdata, peer);
1194 if (!sta) {
1195 rcu_read_unlock();
17e6a59a
AN		 1196 ret = -ENOLINK;
1197 break;
95224fe8
AN		 1198 }
1199
1200 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1201 rcu_read_unlock();
17e6a59a 1202
81dd2b88
AN		 1203 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1204 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
17e6a59a 1205 ret = 0;
95224fe8
AN		 1206 break;
1207 case NL80211_TDLS_DISABLE_LINK:
bb3f8486
LK		 1208 /*
1209 * The teardown message in ieee80211_tdls_mgmt_teardown() was
1210 * created while the queues were stopped, so it might still be
1211 * pending. Before flushing the queues we need to be sure the
1212 * message is handled by the tasklet handling pending messages,
1213 * otherwise we might start destroying the station before
1214 * sending the teardown packet.
1215 * Note that this only forces the tasklet to flush pendings -
1216 * not to stop the tasklet from rescheduling itself.
1217 */
1218 tasklet_kill(&local->tx_pending_tasklet);
db67d661 1219 /* flush a potentially queued teardown packet */
3b24f4c6 1220 ieee80211_flush_queues(local, sdata, false);
db67d661 1221
17e6a59a
AN		 1222 ret = sta_info_destroy_addr(sdata, peer);
1223 break;
95224fe8 1224 default:
17e6a59a
AN		 1225 ret = -ENOTSUPP;
1226 break;
95224fe8
AN		 1227 }
1228
81dd2b88
AN		 1229 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1230 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1231 eth_zero_addr(sdata->u.mgd.tdls_peer);
17e6a59a
AN		 1232 }
1233
1234 mutex_unlock(&local->mtx);
1235 return ret;
95224fe8 1236}
c887f0d3
AN		 1237
1238void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1239 enum nl80211_tdls_operation oper,
1240 u16 reason_code, gfp_t gfp)
1241{
1242 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1243
1244 if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1245 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1246 oper);
1247 return;
1248 }
1249
1250 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1251}
1252EXPORT_SYMBOL(ieee80211_tdls_oper_request);
a7a6bdd0
AN		 1253
1254static void
1255iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1256{
1257 struct ieee80211_ch_switch_timing *ch_sw;
1258
1259 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1260 *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1261
1262 ch_sw = (void *)buf;
1263 ch_sw->switch_time = cpu_to_le16(switch_time);
1264 ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1265}
1266
1267/* find switch timing IE in SKB ready for Tx */
1268static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1269{
1270 struct ieee80211_tdls_data *tf;
1271 const u8 *ie_start;
1272
1273 /*
1274 * Get the offset for the new location of the switch timing IE.
1275 * The SKB network header will now point to the "payload_type"
1276 * element of the TDLS data frame struct.
1277 */
1278 tf = container_of(skb->data + skb_network_offset(skb),
1279 struct ieee80211_tdls_data, payload_type);
1280 ie_start = tf->u.chan_switch_req.variable;
1281 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1282 skb->len - (ie_start - skb->data));
1283}
1284
1285static struct sk_buff *
1286ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1287 struct cfg80211_chan_def *chandef,
1288 u32 *ch_sw_tm_ie_offset)
1289{
1290 struct ieee80211_sub_if_data *sdata = sta->sdata;
1291 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1292 2 + sizeof(struct ieee80211_ch_switch_timing)];
1293 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1294 u8 *pos = extra_ies;
1295 struct sk_buff *skb;
1296
1297 /*
1298 * if chandef points to a wide channel add a Secondary-Channel
1299 * Offset information element
1300 */
1301 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1302 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1303 bool ht40plus;
1304
1305 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1306 *pos++ = sizeof(*sec_chan_ie);
1307 sec_chan_ie = (void *)pos;
1308
1309 ht40plus = cfg80211_get_chandef_type(chandef) ==
1310 NL80211_CHAN_HT40PLUS;
1311 sec_chan_ie->sec_chan_offs = ht40plus ?
1312 IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1313 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1314 pos += sizeof(*sec_chan_ie);
1315
1316 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1317 }
1318
1319 /* just set the values to 0, this is a template */
1320 iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1321
1322 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1323 WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1324 0, 0, !sta->sta.tdls_initiator,
1325 extra_ies, extra_ies_len,
1326 oper_class, chandef);
1327 if (!skb)
1328 return NULL;
1329
1330 skb = ieee80211_build_data_template(sdata, skb, 0);
1331 if (IS_ERR(skb)) {
1332 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1333 return NULL;
1334 }
1335
1336 if (ch_sw_tm_ie_offset) {
1337 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1338
1339 if (!tm_ie) {
1340 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1341 dev_kfree_skb_any(skb);
1342 return NULL;
1343 }
1344
1345 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1346 }
1347
1348 tdls_dbg(sdata,
1349 "TDLS channel switch request template for %pM ch %d width %d\n",
1350 sta->sta.addr, chandef->chan->center_freq, chandef->width);
1351 return skb;
1352}
1353
1354int
1355ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1356 const u8 *addr, u8 oper_class,
1357 struct cfg80211_chan_def *chandef)
1358{
1359 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1360 struct ieee80211_local *local = sdata->local;
1361 struct sta_info *sta;
1362 struct sk_buff *skb = NULL;
1363 u32 ch_sw_tm_ie;
1364 int ret;
1365
1366 mutex_lock(&local->sta_mtx);
1367 sta = sta_info_get(sdata, addr);
1368 if (!sta) {
1369 tdls_dbg(sdata,
1370 "Invalid TDLS peer %pM for channel switch request\n",
1371 addr);
1372 ret = -ENOENT;
1373 goto out;
1374 }
1375
1376 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1377 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1378 addr);
1379 ret = -ENOTSUPP;
1380 goto out;
1381 }
1382
1383 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1384 &ch_sw_tm_ie);
1385 if (!skb) {
1386 ret = -ENOENT;
1387 goto out;
1388 }
1389
1390 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1391 chandef, skb, ch_sw_tm_ie);
1392 if (!ret)
1393 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1394
1395out:
1396 mutex_unlock(&local->sta_mtx);
1397 dev_kfree_skb_any(skb);
1398 return ret;
1399}
1400
1401void
1402ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1403 struct net_device *dev,
1404 const u8 *addr)
1405{
1406 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1407 struct ieee80211_local *local = sdata->local;
1408 struct sta_info *sta;
1409
1410 mutex_lock(&local->sta_mtx);
1411 sta = sta_info_get(sdata, addr);
1412 if (!sta) {
1413 tdls_dbg(sdata,
1414 "Invalid TDLS peer %pM for channel switch cancel\n",
1415 addr);
1416 goto out;
1417 }
1418
1419 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1420 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1421 addr);
1422 goto out;
1423 }
1424
1425 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1426 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1427
1428out:
1429 mutex_unlock(&local->sta_mtx);
1430}
8a4d32f3
AN		 1431
1432static struct sk_buff *
1433ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1434 u32 *ch_sw_tm_ie_offset)
1435{
1436 struct ieee80211_sub_if_data *sdata = sta->sdata;
1437 struct sk_buff *skb;
1438 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1439
1440 /* initial timing are always zero in the template */
1441 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1442
1443 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1444 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1445 0, 0, !sta->sta.tdls_initiator,
1446 extra_ies, sizeof(extra_ies), 0, NULL);
1447 if (!skb)
1448 return NULL;
1449
1450 skb = ieee80211_build_data_template(sdata, skb, 0);
1451 if (IS_ERR(skb)) {
1452 tdls_dbg(sdata,
1453 "Failed building TDLS channel switch resp frame\n");
1454 return NULL;
1455 }
1456
1457 if (ch_sw_tm_ie_offset) {
1458 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1459
1460 if (!tm_ie) {
1461 tdls_dbg(sdata,
1462 "No switch timing IE in TDLS switch resp\n");
1463 dev_kfree_skb_any(skb);
1464 return NULL;
1465 }
1466
1467 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1468 }
1469
1470 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1471 sta->sta.addr);
1472 return skb;
1473}
1474
1475static int
1476ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1477 struct sk_buff *skb)
1478{
1479 struct ieee80211_local *local = sdata->local;
1480 struct ieee802_11_elems elems;
1481 struct sta_info *sta;
1482 struct ieee80211_tdls_data *tf = (void *)skb->data;
1483 bool local_initiator;
1484 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1485 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1486 struct ieee80211_tdls_ch_sw_params params = {};
1487 int ret;
1488
1489 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1490 params.timestamp = rx_status->device_timestamp;
1491
1492 if (skb->len < baselen) {
1493 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1494 skb->len);
1495 return -EINVAL;
1496 }
1497
1498 mutex_lock(&local->sta_mtx);
1499 sta = sta_info_get(sdata, tf->sa);
1500 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1501 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1502 tf->sa);
1503 ret = -EINVAL;
1504 goto out;
1505 }
1506
1507 params.sta = &sta->sta;
1508 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1509 if (params.status != 0) {
1510 ret = 0;
1511 goto call_drv;
1512 }
1513
1514 ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1515 skb->len - baselen, false, &elems);
1516 if (elems.parse_error) {
1517 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1518 ret = -EINVAL;
1519 goto out;
1520 }
1521
1522 if (!elems.ch_sw_timing || !elems.lnk_id) {
1523 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1524 ret = -EINVAL;
1525 goto out;
1526 }
1527
1528 /* validate the initiator is set correctly */
1529 local_initiator =
1530 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1531 if (local_initiator == sta->sta.tdls_initiator) {
1532 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1533 ret = -EINVAL;
1534 goto out;
1535 }
1536
1537 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1538 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1539
1540 params.tmpl_skb =
1541 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1542 if (!params.tmpl_skb) {
1543 ret = -ENOENT;
1544 goto out;
1545 }
1546
1547call_drv:
1548 drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1549
1550 tdls_dbg(sdata,
1551 "TDLS channel switch response received from %pM status %d\n",
1552 tf->sa, params.status);
1553
1554out:
1555 mutex_unlock(&local->sta_mtx);
1556 dev_kfree_skb_any(params.tmpl_skb);
1557 return ret;
1558}
1559
1560static int
1561ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1562 struct sk_buff *skb)
1563{
1564 struct ieee80211_local *local = sdata->local;
1565 struct ieee802_11_elems elems;
1566 struct cfg80211_chan_def chandef;
1567 struct ieee80211_channel *chan;
1568 enum nl80211_channel_type chan_type;
1569 int freq;
1570 u8 target_channel, oper_class;
1571 bool local_initiator;
1572 struct sta_info *sta;
1573 enum ieee80211_band band;
1574 struct ieee80211_tdls_data *tf = (void *)skb->data;
1575 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1576 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1577 struct ieee80211_tdls_ch_sw_params params = {};
1578 int ret = 0;
1579
1580 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1581 params.timestamp = rx_status->device_timestamp;
1582
1583 if (skb->len < baselen) {
1584 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1585 skb->len);
1586 return -EINVAL;
1587 }
1588
1589 target_channel = tf->u.chan_switch_req.target_channel;
1590 oper_class = tf->u.chan_switch_req.oper_class;
1591
1592 /*
1593 * We can't easily infer the channel band. The operating class is
1594 * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1595 * solution here is to treat channels with number >14 as 5GHz ones,
1596 * and specifically check for the (oper_class, channel) combinations
1597 * where this doesn't hold. These are thankfully unique according to
1598 * IEEE802.11-2012.
1599 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1600 * valid here.
1601 */
1602 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1603 oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1604 target_channel < 14)
1605 band = IEEE80211_BAND_5GHZ;
1606 else
1607 band = target_channel < 14 ? IEEE80211_BAND_2GHZ :
1608 IEEE80211_BAND_5GHZ;
1609
1610 freq = ieee80211_channel_to_frequency(target_channel, band);
1611 if (freq == 0) {
1612 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1613 target_channel);
1614 return -EINVAL;
1615 }
1616
1617 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1618 if (!chan) {
1619 tdls_dbg(sdata,
1620 "Unsupported channel for TDLS chan switch: %d\n",
1621 target_channel);
1622 return -EINVAL;
1623 }
1624
1625 ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1626 skb->len - baselen, false, &elems);
1627 if (elems.parse_error) {
1628 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1629 return -EINVAL;
1630 }
1631
1632 if (!elems.ch_sw_timing || !elems.lnk_id) {
1633 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1634 return -EINVAL;
1635 }
1636
1637 mutex_lock(&local->sta_mtx);
1638 sta = sta_info_get(sdata, tf->sa);
1639 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1640 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1641 tf->sa);
1642 ret = -EINVAL;
1643 goto out;
1644 }
1645
1646 params.sta = &sta->sta;
1647
1648 /* validate the initiator is set correctly */
1649 local_initiator =
1650 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1651 if (local_initiator == sta->sta.tdls_initiator) {
1652 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1653 ret = -EINVAL;
1654 goto out;
1655 }
1656
1657 if (!sta->sta.ht_cap.ht_supported) {
1658 chan_type = NL80211_CHAN_NO_HT;
1659 } else if (!elems.sec_chan_offs) {
1660 chan_type = NL80211_CHAN_HT20;
1661 } else {
1662 switch (elems.sec_chan_offs->sec_chan_offs) {
1663 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1664 chan_type = NL80211_CHAN_HT40PLUS;
1665 break;
1666 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1667 chan_type = NL80211_CHAN_HT40MINUS;
1668 break;
1669 default:
1670 chan_type = NL80211_CHAN_HT20;
1671 break;
1672 }
1673 }
1674
1675 cfg80211_chandef_create(&chandef, chan, chan_type);
1676 params.chandef = &chandef;
1677
1678 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1679 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1680
1681 params.tmpl_skb =
1682 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1683 &params.ch_sw_tm_ie);
1684 if (!params.tmpl_skb) {
1685 ret = -ENOENT;
1686 goto out;
1687 }
1688
1689 drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1690
1691 tdls_dbg(sdata,
1692 "TDLS ch switch request received from %pM ch %d width %d\n",
1693 tf->sa, params.chandef->chan->center_freq,
1694 params.chandef->width);
1695out:
1696 mutex_unlock(&local->sta_mtx);
1697 dev_kfree_skb_any(params.tmpl_skb);
1698 return ret;
1699}
1700
1701void ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1702 struct sk_buff *skb)
1703{
1704 struct ieee80211_tdls_data *tf = (void *)skb->data;
1705 struct wiphy *wiphy = sdata->local->hw.wiphy;
1706
1707 /* make sure the driver supports it */
1708 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1709 return;
1710
1711 /* we want to access the entire packet */
1712 if (skb_linearize(skb))
1713 return;
1714 /*
1715 * The packet/size was already validated by mac80211 Rx path, only look
1716 * at the action type.
1717 */
1718 switch (tf->action_code) {
1719 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1720 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1721 break;
1722 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1723 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1724 break;
1725 default:
1726 WARN_ON_ONCE(1);
1727 return;
1728 }
1729}
Linux kernel - Deliverables
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