1 /*
2 * mac80211 TDLS handling code
3 *
4 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
5 * Copyright 2014, Intel Corporation
6 * Copyright 2014 Intel Mobile Communications GmbH
7 * Copyright 2015 - 2016 Intel Deutschland GmbH
8 *
9 * This file is GPLv2 as found in COPYING.
10 */
11
12 #include <linux/ieee80211.h>
13 #include <linux/log2.h>
14 #include <net/cfg80211.h>
15 #include <linux/rtnetlink.h>
16 #include "ieee80211_i.h"
17 #include "driver-ops.h"
18 #include "rate.h"
19 #include "wme.h"
20
21 /* give usermode some time for retries in setting up the TDLS session */
22 #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ)
23
ieee80211_tdls_peer_del_work(struct work_struct * wk)24 void ieee80211_tdls_peer_del_work(struct work_struct *wk)
25 {
26 struct ieee80211_sub_if_data *sdata;
27 struct ieee80211_local *local;
28
29 sdata = container_of(wk, struct ieee80211_sub_if_data,
30 u.mgd.tdls_peer_del_work.work);
31 local = sdata->local;
32
33 mutex_lock(&local->mtx);
34 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
35 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
36 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
37 eth_zero_addr(sdata->u.mgd.tdls_peer);
38 }
39 mutex_unlock(&local->mtx);
40 }
41
ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)42 static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata,
43 struct sk_buff *skb)
44 {
45 struct ieee80211_local *local = sdata->local;
46 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
47 bool chan_switch = local->hw.wiphy->features &
48 NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
49 bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
50 !ifmgd->tdls_wider_bw_prohibited;
51 bool buffer_sta = ieee80211_hw_check(&local->hw,
52 SUPPORTS_TDLS_BUFFER_STA);
53 struct ieee80211_supported_band *sband = ieee80211_get_sband(sdata);
54 bool vht = sband && sband->vht_cap.vht_supported;
55 u8 *pos = skb_put(skb, 10);
56
57 *pos++ = WLAN_EID_EXT_CAPABILITY;
58 *pos++ = 8; /* len */
59 *pos++ = 0x0;
60 *pos++ = 0x0;
61 *pos++ = 0x0;
62 *pos++ = (chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0) |
63 (buffer_sta ? WLAN_EXT_CAPA4_TDLS_BUFFER_STA : 0);
64 *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
65 *pos++ = 0;
66 *pos++ = 0;
67 *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
68 }
69
70 static u8
ieee80211_tdls_add_subband(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u16 start,u16 end,u16 spacing)71 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
72 struct sk_buff *skb, u16 start, u16 end,
73 u16 spacing)
74 {
75 u8 subband_cnt = 0, ch_cnt = 0;
76 struct ieee80211_channel *ch;
77 struct cfg80211_chan_def chandef;
78 int i, subband_start;
79 struct wiphy *wiphy = sdata->local->hw.wiphy;
80
81 for (i = start; i <= end; i += spacing) {
82 if (!ch_cnt)
83 subband_start = i;
84
85 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
86 if (ch) {
87 /* we will be active on the channel */
88 cfg80211_chandef_create(&chandef, ch,
89 NL80211_CHAN_NO_HT);
90 if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
91 sdata->wdev.iftype)) {
92 ch_cnt++;
93 /*
94 * check if the next channel is also part of
95 * this allowed range
96 */
97 continue;
98 }
99 }
100
101 /*
102 * we've reached the end of a range, with allowed channels
103 * found
104 */
105 if (ch_cnt) {
106 u8 *pos = skb_put(skb, 2);
107 *pos++ = ieee80211_frequency_to_channel(subband_start);
108 *pos++ = ch_cnt;
109
110 subband_cnt++;
111 ch_cnt = 0;
112 }
113 }
114
115 /* all channels in the requested range are allowed - add them here */
116 if (ch_cnt) {
117 u8 *pos = skb_put(skb, 2);
118 *pos++ = ieee80211_frequency_to_channel(subband_start);
119 *pos++ = ch_cnt;
120
121 subband_cnt++;
122 }
123
124 return subband_cnt;
125 }
126
127 static void
ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)128 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
129 struct sk_buff *skb)
130 {
131 /*
132 * Add possible channels for TDLS. These are channels that are allowed
133 * to be active.
134 */
135 u8 subband_cnt;
136 u8 *pos = skb_put(skb, 2);
137
138 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
139
140 /*
141 * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
142 * this doesn't happen in real world scenarios.
143 */
144
145 /* 2GHz, with 5MHz spacing */
146 subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
147
148 /* 5GHz, with 20MHz spacing */
149 subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
150
151 /* length */
152 *pos = 2 * subband_cnt;
153 }
154
ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)155 static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata,
156 struct sk_buff *skb)
157 {
158 u8 *pos;
159 u8 op_class;
160
161 if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef,
162 &op_class))
163 return;
164
165 pos = skb_put(skb, 4);
166 *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
167 *pos++ = 2; /* len */
168
169 *pos++ = op_class;
170 *pos++ = op_class; /* give current operating class as alternate too */
171 }
172
ieee80211_tdls_add_bss_coex_ie(struct sk_buff * skb)173 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
174 {
175 u8 *pos = skb_put(skb, 3);
176
177 *pos++ = WLAN_EID_BSS_COEX_2040;
178 *pos++ = 1; /* len */
179
180 *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
181 }
182
ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data * sdata,u16 status_code)183 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
184 u16 status_code)
185 {
186 struct ieee80211_supported_band *sband;
187
188 /* The capability will be 0 when sending a failure code */
189 if (status_code != 0)
190 return 0;
191
192 sband = ieee80211_get_sband(sdata);
193 if (sband && sband->band == NL80211_BAND_2GHZ) {
194 return WLAN_CAPABILITY_SHORT_SLOT_TIME |
195 WLAN_CAPABILITY_SHORT_PREAMBLE;
196 }
197
198 return 0;
199 }
200
ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,const u8 * peer,bool initiator)201 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
202 struct sk_buff *skb, const u8 *peer,
203 bool initiator)
204 {
205 struct ieee80211_tdls_lnkie *lnkid;
206 const u8 *init_addr, *rsp_addr;
207
208 if (initiator) {
209 init_addr = sdata->vif.addr;
210 rsp_addr = peer;
211 } else {
212 init_addr = peer;
213 rsp_addr = sdata->vif.addr;
214 }
215
216 lnkid = skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
217
218 lnkid->ie_type = WLAN_EID_LINK_ID;
219 lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
220
221 memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
222 memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
223 memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
224 }
225
226 static void
ieee80211_tdls_add_aid(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)227 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
228 {
229 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
230 u8 *pos = skb_put(skb, 4);
231
232 *pos++ = WLAN_EID_AID;
233 *pos++ = 2; /* len */
234 put_unaligned_le16(ifmgd->aid, pos);
235 }
236
237 /* translate numbering in the WMM parameter IE to the mac80211 notation */
ieee80211_ac_from_wmm(int ac)238 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
239 {
240 switch (ac) {
241 default:
242 WARN_ON_ONCE(1);
243 /* fall through */
244 case 0:
245 return IEEE80211_AC_BE;
246 case 1:
247 return IEEE80211_AC_BK;
248 case 2:
249 return IEEE80211_AC_VI;
250 case 3:
251 return IEEE80211_AC_VO;
252 }
253 }
254
ieee80211_wmm_aci_aifsn(int aifsn,bool acm,int aci)255 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
256 {
257 u8 ret;
258
259 ret = aifsn & 0x0f;
260 if (acm)
261 ret |= 0x10;
262 ret |= (aci << 5) & 0x60;
263 return ret;
264 }
265
ieee80211_wmm_ecw(u16 cw_min,u16 cw_max)266 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
267 {
268 return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
269 ((ilog2(cw_max + 1) << 0x4) & 0xf0);
270 }
271
ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)272 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
273 struct sk_buff *skb)
274 {
275 struct ieee80211_wmm_param_ie *wmm;
276 struct ieee80211_tx_queue_params *txq;
277 int i;
278
279 wmm = skb_put_zero(skb, sizeof(*wmm));
280
281 wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
282 wmm->len = sizeof(*wmm) - 2;
283
284 wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
285 wmm->oui[1] = 0x50;
286 wmm->oui[2] = 0xf2;
287 wmm->oui_type = 2; /* WME */
288 wmm->oui_subtype = 1; /* WME param */
289 wmm->version = 1; /* WME ver */
290 wmm->qos_info = 0; /* U-APSD not in use */
291
292 /*
293 * Use the EDCA parameters defined for the BSS, or default if the AP
294 * doesn't support it, as mandated by 802.11-2012 section 10.22.4
295 */
296 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
297 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
298 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
299 txq->acm, i);
300 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
301 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
302 }
303 }
304
305 static void
ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data * sdata,struct sta_info * sta)306 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
307 struct sta_info *sta)
308 {
309 /* IEEE802.11ac-2013 Table E-4 */
310 u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
311 struct cfg80211_chan_def uc = sta->tdls_chandef;
312 enum nl80211_chan_width max_width = ieee80211_sta_cap_chan_bw(sta);
313 int i;
314
315 /* only support upgrading non-narrow channels up to 80Mhz */
316 if (max_width == NL80211_CHAN_WIDTH_5 ||
317 max_width == NL80211_CHAN_WIDTH_10)
318 return;
319
320 if (max_width > NL80211_CHAN_WIDTH_80)
321 max_width = NL80211_CHAN_WIDTH_80;
322
323 if (uc.width >= max_width)
324 return;
325 /*
326 * Channel usage constrains in the IEEE802.11ac-2013 specification only
327 * allow expanding a 20MHz channel to 80MHz in a single way. In
328 * addition, there are no 40MHz allowed channels that are not part of
329 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
330 */
331 for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
332 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
333 uc.center_freq1 = centers_80mhz[i];
334 uc.center_freq2 = 0;
335 uc.width = NL80211_CHAN_WIDTH_80;
336 break;
337 }
338
339 if (!uc.center_freq1)
340 return;
341
342 /* proceed to downgrade the chandef until usable or the same as AP BW */
343 while (uc.width > max_width ||
344 (uc.width > sta->tdls_chandef.width &&
345 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
346 sdata->wdev.iftype)))
347 ieee80211_chandef_downgrade(&uc);
348
349 if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
350 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
351 sta->tdls_chandef.width, uc.width);
352
353 /*
354 * the station is not yet authorized when BW upgrade is done,
355 * locking is not required
356 */
357 sta->tdls_chandef = uc;
358 }
359 }
360
361 static void
ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,const u8 * peer,u8 action_code,bool initiator,const u8 * extra_ies,size_t extra_ies_len)362 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
363 struct sk_buff *skb, const u8 *peer,
364 u8 action_code, bool initiator,
365 const u8 *extra_ies, size_t extra_ies_len)
366 {
367 struct ieee80211_supported_band *sband;
368 struct ieee80211_local *local = sdata->local;
369 struct ieee80211_sta_ht_cap ht_cap;
370 struct ieee80211_sta_vht_cap vht_cap;
371 struct sta_info *sta = NULL;
372 size_t offset = 0, noffset;
373 u8 *pos;
374
375 sband = ieee80211_get_sband(sdata);
376 if (!sband)
377 return;
378
379 ieee80211_add_srates_ie(sdata, skb, false, sband->band);
380 ieee80211_add_ext_srates_ie(sdata, skb, false, sband->band);
381 ieee80211_tdls_add_supp_channels(sdata, skb);
382
383 /* add any custom IEs that go before Extended Capabilities */
384 if (extra_ies_len) {
385 static const u8 before_ext_cap[] = {
386 WLAN_EID_SUPP_RATES,
387 WLAN_EID_COUNTRY,
388 WLAN_EID_EXT_SUPP_RATES,
389 WLAN_EID_SUPPORTED_CHANNELS,
390 WLAN_EID_RSN,
391 };
392 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
393 before_ext_cap,
394 ARRAY_SIZE(before_ext_cap),
395 offset);
396 skb_put_data(skb, extra_ies + offset, noffset - offset);
397 offset = noffset;
398 }
399
400 ieee80211_tdls_add_ext_capab(sdata, skb);
401
402 /* add the QoS element if we support it */
403 if (local->hw.queues >= IEEE80211_NUM_ACS &&
404 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
405 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
406
407 /* add any custom IEs that go before HT capabilities */
408 if (extra_ies_len) {
409 static const u8 before_ht_cap[] = {
410 WLAN_EID_SUPP_RATES,
411 WLAN_EID_COUNTRY,
412 WLAN_EID_EXT_SUPP_RATES,
413 WLAN_EID_SUPPORTED_CHANNELS,
414 WLAN_EID_RSN,
415 WLAN_EID_EXT_CAPABILITY,
416 WLAN_EID_QOS_CAPA,
417 WLAN_EID_FAST_BSS_TRANSITION,
418 WLAN_EID_TIMEOUT_INTERVAL,
419 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
420 };
421 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
422 before_ht_cap,
423 ARRAY_SIZE(before_ht_cap),
424 offset);
425 skb_put_data(skb, extra_ies + offset, noffset - offset);
426 offset = noffset;
427 }
428
429 mutex_lock(&local->sta_mtx);
430
431 /* we should have the peer STA if we're already responding */
432 if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
433 sta = sta_info_get(sdata, peer);
434 if (WARN_ON_ONCE(!sta)) {
435 mutex_unlock(&local->sta_mtx);
436 return;
437 }
438
439 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
440 }
441
442 ieee80211_tdls_add_oper_classes(sdata, skb);
443
444 /*
445 * with TDLS we can switch channels, and HT-caps are not necessarily
446 * the same on all bands. The specification limits the setup to a
447 * single HT-cap, so use the current band for now.
448 */
449 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
450
451 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
452 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
453 ht_cap.ht_supported) {
454 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
455
456 /* disable SMPS in TDLS initiator */
457 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
458 << IEEE80211_HT_CAP_SM_PS_SHIFT;
459
460 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
461 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
462 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
463 ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
464 /* the peer caps are already intersected with our own */
465 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
466
467 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
468 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
469 }
470
471 if (ht_cap.ht_supported &&
472 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
473 ieee80211_tdls_add_bss_coex_ie(skb);
474
475 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
476
477 /* add any custom IEs that go before VHT capabilities */
478 if (extra_ies_len) {
479 static const u8 before_vht_cap[] = {
480 WLAN_EID_SUPP_RATES,
481 WLAN_EID_COUNTRY,
482 WLAN_EID_EXT_SUPP_RATES,
483 WLAN_EID_SUPPORTED_CHANNELS,
484 WLAN_EID_RSN,
485 WLAN_EID_EXT_CAPABILITY,
486 WLAN_EID_QOS_CAPA,
487 WLAN_EID_FAST_BSS_TRANSITION,
488 WLAN_EID_TIMEOUT_INTERVAL,
489 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
490 WLAN_EID_MULTI_BAND,
491 };
492 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
493 before_vht_cap,
494 ARRAY_SIZE(before_vht_cap),
495 offset);
496 skb_put_data(skb, extra_ies + offset, noffset - offset);
497 offset = noffset;
498 }
499
500 /* build the VHT-cap similarly to the HT-cap */
501 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
502 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
503 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
504 vht_cap.vht_supported) {
505 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
506
507 /* the AID is present only when VHT is implemented */
508 if (action_code == WLAN_TDLS_SETUP_REQUEST)
509 ieee80211_tdls_add_aid(sdata, skb);
510
511 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
512 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
513 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
514 vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
515 /* the peer caps are already intersected with our own */
516 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
517
518 /* the AID is present only when VHT is implemented */
519 ieee80211_tdls_add_aid(sdata, skb);
520
521 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
522 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
523
524 /*
525 * if both peers support WIDER_BW, we can expand the chandef to
526 * a wider compatible one, up to 80MHz
527 */
528 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
529 ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
530 }
531
532 mutex_unlock(&local->sta_mtx);
533
534 /* add any remaining IEs */
535 if (extra_ies_len) {
536 noffset = extra_ies_len;
537 skb_put_data(skb, extra_ies + offset, noffset - offset);
538 }
539
540 }
541
542 static void
ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,const u8 * peer,bool initiator,const u8 * extra_ies,size_t extra_ies_len)543 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
544 struct sk_buff *skb, const u8 *peer,
545 bool initiator, const u8 *extra_ies,
546 size_t extra_ies_len)
547 {
548 struct ieee80211_local *local = sdata->local;
549 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
550 size_t offset = 0, noffset;
551 struct sta_info *sta, *ap_sta;
552 struct ieee80211_supported_band *sband;
553 u8 *pos;
554
555 sband = ieee80211_get_sband(sdata);
556 if (!sband)
557 return;
558
559 mutex_lock(&local->sta_mtx);
560
561 sta = sta_info_get(sdata, peer);
562 ap_sta = sta_info_get(sdata, ifmgd->bssid);
563 if (WARN_ON_ONCE(!sta || !ap_sta)) {
564 mutex_unlock(&local->sta_mtx);
565 return;
566 }
567
568 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
569
570 /* add any custom IEs that go before the QoS IE */
571 if (extra_ies_len) {
572 static const u8 before_qos[] = {
573 WLAN_EID_RSN,
574 };
575 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
576 before_qos,
577 ARRAY_SIZE(before_qos),
578 offset);
579 skb_put_data(skb, extra_ies + offset, noffset - offset);
580 offset = noffset;
581 }
582
583 /* add the QoS param IE if both the peer and we support it */
584 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
585 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
586
587 /* add any custom IEs that go before HT operation */
588 if (extra_ies_len) {
589 static const u8 before_ht_op[] = {
590 WLAN_EID_RSN,
591 WLAN_EID_QOS_CAPA,
592 WLAN_EID_FAST_BSS_TRANSITION,
593 WLAN_EID_TIMEOUT_INTERVAL,
594 };
595 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
596 before_ht_op,
597 ARRAY_SIZE(before_ht_op),
598 offset);
599 skb_put_data(skb, extra_ies + offset, noffset - offset);
600 offset = noffset;
601 }
602
603 /*
604 * if HT support is only added in TDLS, we need an HT-operation IE.
605 * add the IE as required by IEEE802.11-2012 9.23.3.2.
606 */
607 if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
608 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
609 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
610 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
611
612 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
613 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
614 &sdata->vif.bss_conf.chandef, prot,
615 true);
616 }
617
618 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
619
620 /* only include VHT-operation if not on the 2.4GHz band */
621 if (sband->band != NL80211_BAND_2GHZ &&
622 sta->sta.vht_cap.vht_supported) {
623 /*
624 * if both peers support WIDER_BW, we can expand the chandef to
625 * a wider compatible one, up to 80MHz
626 */
627 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
628 ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
629
630 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
631 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
632 &sta->tdls_chandef);
633 }
634
635 mutex_unlock(&local->sta_mtx);
636
637 /* add any remaining IEs */
638 if (extra_ies_len) {
639 noffset = extra_ies_len;
640 skb_put_data(skb, extra_ies + offset, noffset - offset);
641 }
642 }
643
644 static void
ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,const u8 * peer,bool initiator,const u8 * extra_ies,size_t extra_ies_len,u8 oper_class,struct cfg80211_chan_def * chandef)645 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
646 struct sk_buff *skb, const u8 *peer,
647 bool initiator, const u8 *extra_ies,
648 size_t extra_ies_len, u8 oper_class,
649 struct cfg80211_chan_def *chandef)
650 {
651 struct ieee80211_tdls_data *tf;
652 size_t offset = 0, noffset;
653
654 if (WARN_ON_ONCE(!chandef))
655 return;
656
657 tf = (void *)skb->data;
658 tf->u.chan_switch_req.target_channel =
659 ieee80211_frequency_to_channel(chandef->chan->center_freq);
660 tf->u.chan_switch_req.oper_class = oper_class;
661
662 if (extra_ies_len) {
663 static const u8 before_lnkie[] = {
664 WLAN_EID_SECONDARY_CHANNEL_OFFSET,
665 };
666 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
667 before_lnkie,
668 ARRAY_SIZE(before_lnkie),
669 offset);
670 skb_put_data(skb, extra_ies + offset, noffset - offset);
671 offset = noffset;
672 }
673
674 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
675
676 /* add any remaining IEs */
677 if (extra_ies_len) {
678 noffset = extra_ies_len;
679 skb_put_data(skb, extra_ies + offset, noffset - offset);
680 }
681 }
682
683 static void
ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,const u8 * peer,u16 status_code,bool initiator,const u8 * extra_ies,size_t extra_ies_len)684 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
685 struct sk_buff *skb, const u8 *peer,
686 u16 status_code, bool initiator,
687 const u8 *extra_ies,
688 size_t extra_ies_len)
689 {
690 if (status_code == 0)
691 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
692
693 if (extra_ies_len)
694 skb_put_data(skb, extra_ies, extra_ies_len);
695 }
696
ieee80211_tdls_add_ies(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,const u8 * peer,u8 action_code,u16 status_code,bool initiator,const u8 * extra_ies,size_t extra_ies_len,u8 oper_class,struct cfg80211_chan_def * chandef)697 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
698 struct sk_buff *skb, const u8 *peer,
699 u8 action_code, u16 status_code,
700 bool initiator, const u8 *extra_ies,
701 size_t extra_ies_len, u8 oper_class,
702 struct cfg80211_chan_def *chandef)
703 {
704 switch (action_code) {
705 case WLAN_TDLS_SETUP_REQUEST:
706 case WLAN_TDLS_SETUP_RESPONSE:
707 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
708 if (status_code == 0)
709 ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
710 action_code,
711 initiator,
712 extra_ies,
713 extra_ies_len);
714 break;
715 case WLAN_TDLS_SETUP_CONFIRM:
716 if (status_code == 0)
717 ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
718 initiator, extra_ies,
719 extra_ies_len);
720 break;
721 case WLAN_TDLS_TEARDOWN:
722 case WLAN_TDLS_DISCOVERY_REQUEST:
723 if (extra_ies_len)
724 skb_put_data(skb, extra_ies, extra_ies_len);
725 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
726 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
727 break;
728 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
729 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
730 initiator, extra_ies,
731 extra_ies_len,
732 oper_class, chandef);
733 break;
734 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
735 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
736 status_code,
737 initiator, extra_ies,
738 extra_ies_len);
739 break;
740 }
741
742 }
743
744 static int
ieee80211_prep_tdls_encap_data(struct wiphy * wiphy,struct net_device * dev,const u8 * peer,u8 action_code,u8 dialog_token,u16 status_code,struct sk_buff * skb)745 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
746 const u8 *peer, u8 action_code, u8 dialog_token,
747 u16 status_code, struct sk_buff *skb)
748 {
749 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
750 struct ieee80211_tdls_data *tf;
751
752 tf = skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
753
754 memcpy(tf->da, peer, ETH_ALEN);
755 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
756 tf->ether_type = cpu_to_be16(ETH_P_TDLS);
757 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
758
759 /* network header is after the ethernet header */
760 skb_set_network_header(skb, ETH_HLEN);
761
762 switch (action_code) {
763 case WLAN_TDLS_SETUP_REQUEST:
764 tf->category = WLAN_CATEGORY_TDLS;
765 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
766
767 skb_put(skb, sizeof(tf->u.setup_req));
768 tf->u.setup_req.dialog_token = dialog_token;
769 tf->u.setup_req.capability =
770 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
771 status_code));
772 break;
773 case WLAN_TDLS_SETUP_RESPONSE:
774 tf->category = WLAN_CATEGORY_TDLS;
775 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
776
777 skb_put(skb, sizeof(tf->u.setup_resp));
778 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
779 tf->u.setup_resp.dialog_token = dialog_token;
780 tf->u.setup_resp.capability =
781 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
782 status_code));
783 break;
784 case WLAN_TDLS_SETUP_CONFIRM:
785 tf->category = WLAN_CATEGORY_TDLS;
786 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
787
788 skb_put(skb, sizeof(tf->u.setup_cfm));
789 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
790 tf->u.setup_cfm.dialog_token = dialog_token;
791 break;
792 case WLAN_TDLS_TEARDOWN:
793 tf->category = WLAN_CATEGORY_TDLS;
794 tf->action_code = WLAN_TDLS_TEARDOWN;
795
796 skb_put(skb, sizeof(tf->u.teardown));
797 tf->u.teardown.reason_code = cpu_to_le16(status_code);
798 break;
799 case WLAN_TDLS_DISCOVERY_REQUEST:
800 tf->category = WLAN_CATEGORY_TDLS;
801 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
802
803 skb_put(skb, sizeof(tf->u.discover_req));
804 tf->u.discover_req.dialog_token = dialog_token;
805 break;
806 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
807 tf->category = WLAN_CATEGORY_TDLS;
808 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
809
810 skb_put(skb, sizeof(tf->u.chan_switch_req));
811 break;
812 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
813 tf->category = WLAN_CATEGORY_TDLS;
814 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
815
816 skb_put(skb, sizeof(tf->u.chan_switch_resp));
817 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
818 break;
819 default:
820 return -EINVAL;
821 }
822
823 return 0;
824 }
825
826 static int
ieee80211_prep_tdls_direct(struct wiphy * wiphy,struct net_device * dev,const u8 * peer,u8 action_code,u8 dialog_token,u16 status_code,struct sk_buff * skb)827 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
828 const u8 *peer, u8 action_code, u8 dialog_token,
829 u16 status_code, struct sk_buff *skb)
830 {
831 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
832 struct ieee80211_mgmt *mgmt;
833
834 mgmt = skb_put_zero(skb, 24);
835 memcpy(mgmt->da, peer, ETH_ALEN);
836 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
837 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
838
839 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
840 IEEE80211_STYPE_ACTION);
841
842 switch (action_code) {
843 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
844 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
845 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
846 mgmt->u.action.u.tdls_discover_resp.action_code =
847 WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
848 mgmt->u.action.u.tdls_discover_resp.dialog_token =
849 dialog_token;
850 mgmt->u.action.u.tdls_discover_resp.capability =
851 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
852 status_code));
853 break;
854 default:
855 return -EINVAL;
856 }
857
858 return 0;
859 }
860
861 static struct sk_buff *
ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data * sdata,const u8 * peer,u8 action_code,u8 dialog_token,u16 status_code,bool initiator,const u8 * extra_ies,size_t extra_ies_len,u8 oper_class,struct cfg80211_chan_def * chandef)862 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
863 const u8 *peer, u8 action_code,
864 u8 dialog_token, u16 status_code,
865 bool initiator, const u8 *extra_ies,
866 size_t extra_ies_len, u8 oper_class,
867 struct cfg80211_chan_def *chandef)
868 {
869 struct ieee80211_local *local = sdata->local;
870 struct sk_buff *skb;
871 int ret;
872
873 skb = netdev_alloc_skb(sdata->dev,
874 local->hw.extra_tx_headroom +
875 max(sizeof(struct ieee80211_mgmt),
876 sizeof(struct ieee80211_tdls_data)) +
877 50 + /* supported rates */
878 10 + /* ext capab */
879 26 + /* max(WMM-info, WMM-param) */
880 2 + max(sizeof(struct ieee80211_ht_cap),
881 sizeof(struct ieee80211_ht_operation)) +
882 2 + max(sizeof(struct ieee80211_vht_cap),
883 sizeof(struct ieee80211_vht_operation)) +
884 50 + /* supported channels */
885 3 + /* 40/20 BSS coex */
886 4 + /* AID */
887 4 + /* oper classes */
888 extra_ies_len +
889 sizeof(struct ieee80211_tdls_lnkie));
890 if (!skb)
891 return NULL;
892
893 skb_reserve(skb, local->hw.extra_tx_headroom);
894
895 switch (action_code) {
896 case WLAN_TDLS_SETUP_REQUEST:
897 case WLAN_TDLS_SETUP_RESPONSE:
898 case WLAN_TDLS_SETUP_CONFIRM:
899 case WLAN_TDLS_TEARDOWN:
900 case WLAN_TDLS_DISCOVERY_REQUEST:
901 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
902 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
903 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
904 sdata->dev, peer,
905 action_code, dialog_token,
906 status_code, skb);
907 break;
908 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
909 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
910 peer, action_code,
911 dialog_token, status_code,
912 skb);
913 break;
914 default:
915 ret = -ENOTSUPP;
916 break;
917 }
918
919 if (ret < 0)
920 goto fail;
921
922 ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
923 initiator, extra_ies, extra_ies_len, oper_class,
924 chandef);
925 return skb;
926
927 fail:
928 dev_kfree_skb(skb);
929 return NULL;
930 }
931
932 static int
ieee80211_tdls_prep_mgmt_packet(struct wiphy * wiphy,struct net_device * dev,const u8 * peer,u8 action_code,u8 dialog_token,u16 status_code,u32 peer_capability,bool initiator,const u8 * extra_ies,size_t extra_ies_len,u8 oper_class,struct cfg80211_chan_def * chandef)933 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
934 const u8 *peer, u8 action_code, u8 dialog_token,
935 u16 status_code, u32 peer_capability,
936 bool initiator, const u8 *extra_ies,
937 size_t extra_ies_len, u8 oper_class,
938 struct cfg80211_chan_def *chandef)
939 {
940 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
941 struct sk_buff *skb = NULL;
942 struct sta_info *sta;
943 u32 flags = 0;
944 int ret = 0;
945
946 rcu_read_lock();
947 sta = sta_info_get(sdata, peer);
948
949 /* infer the initiator if we can, to support old userspace */
950 switch (action_code) {
951 case WLAN_TDLS_SETUP_REQUEST:
952 if (sta) {
953 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
954 sta->sta.tdls_initiator = false;
955 }
956 /* fall-through */
957 case WLAN_TDLS_SETUP_CONFIRM:
958 case WLAN_TDLS_DISCOVERY_REQUEST:
959 initiator = true;
960 break;
961 case WLAN_TDLS_SETUP_RESPONSE:
962 /*
963 * In some testing scenarios, we send a request and response.
964 * Make the last packet sent take effect for the initiator
965 * value.
966 */
967 if (sta) {
968 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
969 sta->sta.tdls_initiator = true;
970 }
971 /* fall-through */
972 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
973 initiator = false;
974 break;
975 case WLAN_TDLS_TEARDOWN:
976 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
977 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
978 /* any value is ok */
979 break;
980 default:
981 ret = -ENOTSUPP;
982 break;
983 }
984
985 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
986 initiator = true;
987
988 rcu_read_unlock();
989 if (ret < 0)
990 goto fail;
991
992 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
993 dialog_token, status_code,
994 initiator, extra_ies,
995 extra_ies_len, oper_class,
996 chandef);
997 if (!skb) {
998 ret = -EINVAL;
999 goto fail;
1000 }
1001
1002 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
1003 ieee80211_tx_skb(sdata, skb);
1004 return 0;
1005 }
1006
1007 /*
1008 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1009 * we should default to AC_VI.
1010 */
1011 switch (action_code) {
1012 case WLAN_TDLS_SETUP_REQUEST:
1013 case WLAN_TDLS_SETUP_RESPONSE:
1014 skb->priority = 256 + 2;
1015 break;
1016 default:
1017 skb->priority = 256 + 5;
1018 break;
1019 }
1020 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, skb));
1021
1022 /*
1023 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1024 * Later, if no ACK is returned from peer, we will re-send the teardown
1025 * packet through the AP.
1026 */
1027 if ((action_code == WLAN_TDLS_TEARDOWN) &&
1028 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1029 bool try_resend; /* Should we keep skb for possible resend */
1030
1031 /* If not sending directly to peer - no point in keeping skb */
1032 rcu_read_lock();
1033 sta = sta_info_get(sdata, peer);
1034 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1035 rcu_read_unlock();
1036
1037 spin_lock_bh(&sdata->u.mgd.teardown_lock);
1038 if (try_resend && !sdata->u.mgd.teardown_skb) {
1039 /* Mark it as requiring TX status callback */
1040 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1041 IEEE80211_TX_INTFL_MLME_CONN_TX;
1042
1043 /*
1044 * skb is copied since mac80211 will later set
1045 * properties that might not be the same as the AP,
1046 * such as encryption, QoS, addresses, etc.
1047 *
1048 * No problem if skb_copy() fails, so no need to check.
1049 */
1050 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1051 sdata->u.mgd.orig_teardown_skb = skb;
1052 }
1053 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1054 }
1055
1056 /* disable bottom halves when entering the Tx path */
1057 local_bh_disable();
1058 __ieee80211_subif_start_xmit(skb, dev, flags);
1059 local_bh_enable();
1060
1061 return ret;
1062
1063 fail:
1064 dev_kfree_skb(skb);
1065 return ret;
1066 }
1067
1068 static int
ieee80211_tdls_mgmt_setup(struct wiphy * wiphy,struct net_device * dev,const u8 * peer,u8 action_code,u8 dialog_token,u16 status_code,u32 peer_capability,bool initiator,const u8 * extra_ies,size_t extra_ies_len)1069 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1070 const u8 *peer, u8 action_code, u8 dialog_token,
1071 u16 status_code, u32 peer_capability, bool initiator,
1072 const u8 *extra_ies, size_t extra_ies_len)
1073 {
1074 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1075 struct ieee80211_local *local = sdata->local;
1076 enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode;
1077 int ret;
1078
1079 /* don't support setup with forced SMPS mode that's not off */
1080 if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1081 smps_mode != IEEE80211_SMPS_OFF) {
1082 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1083 smps_mode);
1084 return -ENOTSUPP;
1085 }
1086
1087 mutex_lock(&local->mtx);
1088
1089 /* we don't support concurrent TDLS peer setups */
1090 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1091 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1092 ret = -EBUSY;
1093 goto out_unlock;
1094 }
1095
1096 /*
1097 * make sure we have a STA representing the peer so we drop or buffer
1098 * non-TDLS-setup frames to the peer. We can't send other packets
1099 * during setup through the AP path.
1100 * Allow error packets to be sent - sometimes we don't even add a STA
1101 * before failing the setup.
1102 */
1103 if (status_code == 0) {
1104 rcu_read_lock();
1105 if (!sta_info_get(sdata, peer)) {
1106 rcu_read_unlock();
1107 ret = -ENOLINK;
1108 goto out_unlock;
1109 }
1110 rcu_read_unlock();
1111 }
1112
1113 ieee80211_flush_queues(local, sdata, false);
1114 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1115 mutex_unlock(&local->mtx);
1116
1117 /* we cannot take the mutex while preparing the setup packet */
1118 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1119 dialog_token, status_code,
1120 peer_capability, initiator,
1121 extra_ies, extra_ies_len, 0,
1122 NULL);
1123 if (ret < 0) {
1124 mutex_lock(&local->mtx);
1125 eth_zero_addr(sdata->u.mgd.tdls_peer);
1126 mutex_unlock(&local->mtx);
1127 return ret;
1128 }
1129
1130 ieee80211_queue_delayed_work(&sdata->local->hw,
1131 &sdata->u.mgd.tdls_peer_del_work,
1132 TDLS_PEER_SETUP_TIMEOUT);
1133 return 0;
1134
1135 out_unlock:
1136 mutex_unlock(&local->mtx);
1137 return ret;
1138 }
1139
1140 static int
ieee80211_tdls_mgmt_teardown(struct wiphy * wiphy,struct net_device * dev,const u8 * peer,u8 action_code,u8 dialog_token,u16 status_code,u32 peer_capability,bool initiator,const u8 * extra_ies,size_t extra_ies_len)1141 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1142 const u8 *peer, u8 action_code, u8 dialog_token,
1143 u16 status_code, u32 peer_capability,
1144 bool initiator, const u8 *extra_ies,
1145 size_t extra_ies_len)
1146 {
1147 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1148 struct ieee80211_local *local = sdata->local;
1149 struct sta_info *sta;
1150 int ret;
1151
1152 /*
1153 * No packets can be transmitted to the peer via the AP during setup -
1154 * the STA is set as a TDLS peer, but is not authorized.
1155 * During teardown, we prevent direct transmissions by stopping the
1156 * queues and flushing all direct packets.
1157 */
1158 ieee80211_stop_vif_queues(local, sdata,
1159 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1160 ieee80211_flush_queues(local, sdata, false);
1161
1162 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1163 dialog_token, status_code,
1164 peer_capability, initiator,
1165 extra_ies, extra_ies_len, 0,
1166 NULL);
1167 if (ret < 0)
1168 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1169 ret);
1170
1171 /*
1172 * Remove the STA AUTH flag to force further traffic through the AP. If
1173 * the STA was unreachable, it was already removed.
1174 */
1175 rcu_read_lock();
1176 sta = sta_info_get(sdata, peer);
1177 if (sta)
1178 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1179 rcu_read_unlock();
1180
1181 ieee80211_wake_vif_queues(local, sdata,
1182 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1183
1184 return 0;
1185 }
1186
ieee80211_tdls_mgmt(struct wiphy * wiphy,struct net_device * dev,const u8 * peer,u8 action_code,u8 dialog_token,u16 status_code,u32 peer_capability,bool initiator,const u8 * extra_ies,size_t extra_ies_len)1187 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1188 const u8 *peer, u8 action_code, u8 dialog_token,
1189 u16 status_code, u32 peer_capability,
1190 bool initiator, const u8 *extra_ies,
1191 size_t extra_ies_len)
1192 {
1193 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1194 int ret;
1195
1196 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1197 return -ENOTSUPP;
1198
1199 /* make sure we are in managed mode, and associated */
1200 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1201 !sdata->u.mgd.associated)
1202 return -EINVAL;
1203
1204 switch (action_code) {
1205 case WLAN_TDLS_SETUP_REQUEST:
1206 case WLAN_TDLS_SETUP_RESPONSE:
1207 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1208 dialog_token, status_code,
1209 peer_capability, initiator,
1210 extra_ies, extra_ies_len);
1211 break;
1212 case WLAN_TDLS_TEARDOWN:
1213 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1214 action_code, dialog_token,
1215 status_code,
1216 peer_capability, initiator,
1217 extra_ies, extra_ies_len);
1218 break;
1219 case WLAN_TDLS_DISCOVERY_REQUEST:
1220 /*
1221 * Protect the discovery so we can hear the TDLS discovery
1222 * response frame. It is transmitted directly and not buffered
1223 * by the AP.
1224 */
1225 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1226 /* fall-through */
1227 case WLAN_TDLS_SETUP_CONFIRM:
1228 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1229 /* no special handling */
1230 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1231 action_code,
1232 dialog_token,
1233 status_code,
1234 peer_capability,
1235 initiator, extra_ies,
1236 extra_ies_len, 0, NULL);
1237 break;
1238 default:
1239 ret = -EOPNOTSUPP;
1240 break;
1241 }
1242
1243 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1244 action_code, peer, ret);
1245 return ret;
1246 }
1247
iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data * sdata,struct sta_info * sta)1248 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1249 struct sta_info *sta)
1250 {
1251 struct ieee80211_local *local = sdata->local;
1252 struct ieee80211_chanctx_conf *conf;
1253 struct ieee80211_chanctx *ctx;
1254 enum nl80211_chan_width width;
1255 struct ieee80211_supported_band *sband;
1256
1257 mutex_lock(&local->chanctx_mtx);
1258 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1259 lockdep_is_held(&local->chanctx_mtx));
1260 if (conf) {
1261 width = conf->def.width;
1262 sband = local->hw.wiphy->bands[conf->def.chan->band];
1263 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1264 ieee80211_recalc_chanctx_chantype(local, ctx);
1265
1266 /* if width changed and a peer is given, update its BW */
1267 if (width != conf->def.width && sta &&
1268 test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1269 enum ieee80211_sta_rx_bandwidth bw;
1270
1271 bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1272 bw = min(bw, ieee80211_sta_cap_rx_bw(sta));
1273 if (bw != sta->sta.bandwidth) {
1274 sta->sta.bandwidth = bw;
1275 rate_control_rate_update(local, sband, sta,
1276 IEEE80211_RC_BW_CHANGED);
1277 /*
1278 * if a TDLS peer BW was updated, we need to
1279 * recalc the chandef width again, to get the
1280 * correct chanctx min_def
1281 */
1282 ieee80211_recalc_chanctx_chantype(local, ctx);
1283 }
1284 }
1285
1286 }
1287 mutex_unlock(&local->chanctx_mtx);
1288 }
1289
iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data * sdata)1290 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1291 {
1292 struct sta_info *sta;
1293 bool result = false;
1294
1295 rcu_read_lock();
1296 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1297 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1298 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1299 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1300 !sta->sta.ht_cap.ht_supported)
1301 continue;
1302 result = true;
1303 break;
1304 }
1305 rcu_read_unlock();
1306
1307 return result;
1308 }
1309
1310 static void
iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data * sdata,struct sta_info * sta)1311 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1312 struct sta_info *sta)
1313 {
1314 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1315 bool tdls_ht;
1316 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1317 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1318 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1319 u16 opmode;
1320
1321 /* Nothing to do if the BSS connection uses HT */
1322 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
1323 return;
1324
1325 tdls_ht = (sta && sta->sta.ht_cap.ht_supported) ||
1326 iee80211_tdls_have_ht_peers(sdata);
1327
1328 opmode = sdata->vif.bss_conf.ht_operation_mode;
1329
1330 if (tdls_ht)
1331 opmode |= protection;
1332 else
1333 opmode &= ~protection;
1334
1335 if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1336 return;
1337
1338 sdata->vif.bss_conf.ht_operation_mode = opmode;
1339 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT);
1340 }
1341
ieee80211_tdls_oper(struct wiphy * wiphy,struct net_device * dev,const u8 * peer,enum nl80211_tdls_operation oper)1342 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1343 const u8 *peer, enum nl80211_tdls_operation oper)
1344 {
1345 struct sta_info *sta;
1346 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1347 struct ieee80211_local *local = sdata->local;
1348 int ret;
1349
1350 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1351 return -ENOTSUPP;
1352
1353 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1354 return -EINVAL;
1355
1356 switch (oper) {
1357 case NL80211_TDLS_ENABLE_LINK:
1358 case NL80211_TDLS_DISABLE_LINK:
1359 break;
1360 case NL80211_TDLS_TEARDOWN:
1361 case NL80211_TDLS_SETUP:
1362 case NL80211_TDLS_DISCOVERY_REQ:
1363 /* We don't support in-driver setup/teardown/discovery */
1364 return -ENOTSUPP;
1365 }
1366
1367 /* protect possible bss_conf changes and avoid concurrency in
1368 * ieee80211_bss_info_change_notify()
1369 */
1370 sdata_lock(sdata);
1371 mutex_lock(&local->mtx);
1372 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1373
1374 switch (oper) {
1375 case NL80211_TDLS_ENABLE_LINK:
1376 if (sdata->vif.csa_active) {
1377 tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1378 ret = -EBUSY;
1379 break;
1380 }
1381
1382 mutex_lock(&local->sta_mtx);
1383 sta = sta_info_get(sdata, peer);
1384 if (!sta) {
1385 mutex_unlock(&local->sta_mtx);
1386 ret = -ENOLINK;
1387 break;
1388 }
1389
1390 iee80211_tdls_recalc_chanctx(sdata, sta);
1391 iee80211_tdls_recalc_ht_protection(sdata, sta);
1392
1393 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1394 mutex_unlock(&local->sta_mtx);
1395
1396 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1397 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1398 ret = 0;
1399 break;
1400 case NL80211_TDLS_DISABLE_LINK:
1401 /*
1402 * The teardown message in ieee80211_tdls_mgmt_teardown() was
1403 * created while the queues were stopped, so it might still be
1404 * pending. Before flushing the queues we need to be sure the
1405 * message is handled by the tasklet handling pending messages,
1406 * otherwise we might start destroying the station before
1407 * sending the teardown packet.
1408 * Note that this only forces the tasklet to flush pendings -
1409 * not to stop the tasklet from rescheduling itself.
1410 */
1411 tasklet_kill(&local->tx_pending_tasklet);
1412 /* flush a potentially queued teardown packet */
1413 ieee80211_flush_queues(local, sdata, false);
1414
1415 ret = sta_info_destroy_addr(sdata, peer);
1416
1417 mutex_lock(&local->sta_mtx);
1418 iee80211_tdls_recalc_ht_protection(sdata, NULL);
1419 mutex_unlock(&local->sta_mtx);
1420
1421 iee80211_tdls_recalc_chanctx(sdata, NULL);
1422 break;
1423 default:
1424 ret = -ENOTSUPP;
1425 break;
1426 }
1427
1428 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1429 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1430 eth_zero_addr(sdata->u.mgd.tdls_peer);
1431 }
1432
1433 if (ret == 0)
1434 ieee80211_queue_work(&sdata->local->hw,
1435 &sdata->u.mgd.request_smps_work);
1436
1437 mutex_unlock(&local->mtx);
1438 sdata_unlock(sdata);
1439 return ret;
1440 }
1441
ieee80211_tdls_oper_request(struct ieee80211_vif * vif,const u8 * peer,enum nl80211_tdls_operation oper,u16 reason_code,gfp_t gfp)1442 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1443 enum nl80211_tdls_operation oper,
1444 u16 reason_code, gfp_t gfp)
1445 {
1446 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1447
1448 if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1449 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1450 oper);
1451 return;
1452 }
1453
1454 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1455 }
1456 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1457
1458 static void
iee80211_tdls_add_ch_switch_timing(u8 * buf,u16 switch_time,u16 switch_timeout)1459 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1460 {
1461 struct ieee80211_ch_switch_timing *ch_sw;
1462
1463 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1464 *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1465
1466 ch_sw = (void *)buf;
1467 ch_sw->switch_time = cpu_to_le16(switch_time);
1468 ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1469 }
1470
1471 /* find switch timing IE in SKB ready for Tx */
ieee80211_tdls_find_sw_timing_ie(struct sk_buff * skb)1472 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1473 {
1474 struct ieee80211_tdls_data *tf;
1475 const u8 *ie_start;
1476
1477 /*
1478 * Get the offset for the new location of the switch timing IE.
1479 * The SKB network header will now point to the "payload_type"
1480 * element of the TDLS data frame struct.
1481 */
1482 tf = container_of(skb->data + skb_network_offset(skb),
1483 struct ieee80211_tdls_data, payload_type);
1484 ie_start = tf->u.chan_switch_req.variable;
1485 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1486 skb->len - (ie_start - skb->data));
1487 }
1488
1489 static struct sk_buff *
ieee80211_tdls_ch_sw_tmpl_get(struct sta_info * sta,u8 oper_class,struct cfg80211_chan_def * chandef,u32 * ch_sw_tm_ie_offset)1490 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1491 struct cfg80211_chan_def *chandef,
1492 u32 *ch_sw_tm_ie_offset)
1493 {
1494 struct ieee80211_sub_if_data *sdata = sta->sdata;
1495 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1496 2 + sizeof(struct ieee80211_ch_switch_timing)];
1497 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1498 u8 *pos = extra_ies;
1499 struct sk_buff *skb;
1500
1501 /*
1502 * if chandef points to a wide channel add a Secondary-Channel
1503 * Offset information element
1504 */
1505 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1506 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1507 bool ht40plus;
1508
1509 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1510 *pos++ = sizeof(*sec_chan_ie);
1511 sec_chan_ie = (void *)pos;
1512
1513 ht40plus = cfg80211_get_chandef_type(chandef) ==
1514 NL80211_CHAN_HT40PLUS;
1515 sec_chan_ie->sec_chan_offs = ht40plus ?
1516 IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1517 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1518 pos += sizeof(*sec_chan_ie);
1519
1520 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1521 }
1522
1523 /* just set the values to 0, this is a template */
1524 iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1525
1526 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1527 WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1528 0, 0, !sta->sta.tdls_initiator,
1529 extra_ies, extra_ies_len,
1530 oper_class, chandef);
1531 if (!skb)
1532 return NULL;
1533
1534 skb = ieee80211_build_data_template(sdata, skb, 0);
1535 if (IS_ERR(skb)) {
1536 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1537 return NULL;
1538 }
1539
1540 if (ch_sw_tm_ie_offset) {
1541 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1542
1543 if (!tm_ie) {
1544 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1545 dev_kfree_skb_any(skb);
1546 return NULL;
1547 }
1548
1549 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1550 }
1551
1552 tdls_dbg(sdata,
1553 "TDLS channel switch request template for %pM ch %d width %d\n",
1554 sta->sta.addr, chandef->chan->center_freq, chandef->width);
1555 return skb;
1556 }
1557
1558 int
ieee80211_tdls_channel_switch(struct wiphy * wiphy,struct net_device * dev,const u8 * addr,u8 oper_class,struct cfg80211_chan_def * chandef)1559 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1560 const u8 *addr, u8 oper_class,
1561 struct cfg80211_chan_def *chandef)
1562 {
1563 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1564 struct ieee80211_local *local = sdata->local;
1565 struct sta_info *sta;
1566 struct sk_buff *skb = NULL;
1567 u32 ch_sw_tm_ie;
1568 int ret;
1569
1570 mutex_lock(&local->sta_mtx);
1571 sta = sta_info_get(sdata, addr);
1572 if (!sta) {
1573 tdls_dbg(sdata,
1574 "Invalid TDLS peer %pM for channel switch request\n",
1575 addr);
1576 ret = -ENOENT;
1577 goto out;
1578 }
1579
1580 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1581 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1582 addr);
1583 ret = -ENOTSUPP;
1584 goto out;
1585 }
1586
1587 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1588 &ch_sw_tm_ie);
1589 if (!skb) {
1590 ret = -ENOENT;
1591 goto out;
1592 }
1593
1594 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1595 chandef, skb, ch_sw_tm_ie);
1596 if (!ret)
1597 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1598
1599 out:
1600 mutex_unlock(&local->sta_mtx);
1601 dev_kfree_skb_any(skb);
1602 return ret;
1603 }
1604
1605 void
ieee80211_tdls_cancel_channel_switch(struct wiphy * wiphy,struct net_device * dev,const u8 * addr)1606 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1607 struct net_device *dev,
1608 const u8 *addr)
1609 {
1610 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1611 struct ieee80211_local *local = sdata->local;
1612 struct sta_info *sta;
1613
1614 mutex_lock(&local->sta_mtx);
1615 sta = sta_info_get(sdata, addr);
1616 if (!sta) {
1617 tdls_dbg(sdata,
1618 "Invalid TDLS peer %pM for channel switch cancel\n",
1619 addr);
1620 goto out;
1621 }
1622
1623 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1624 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1625 addr);
1626 goto out;
1627 }
1628
1629 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1630 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1631
1632 out:
1633 mutex_unlock(&local->sta_mtx);
1634 }
1635
1636 static struct sk_buff *
ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info * sta,u32 * ch_sw_tm_ie_offset)1637 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1638 u32 *ch_sw_tm_ie_offset)
1639 {
1640 struct ieee80211_sub_if_data *sdata = sta->sdata;
1641 struct sk_buff *skb;
1642 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1643
1644 /* initial timing are always zero in the template */
1645 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1646
1647 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1648 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1649 0, 0, !sta->sta.tdls_initiator,
1650 extra_ies, sizeof(extra_ies), 0, NULL);
1651 if (!skb)
1652 return NULL;
1653
1654 skb = ieee80211_build_data_template(sdata, skb, 0);
1655 if (IS_ERR(skb)) {
1656 tdls_dbg(sdata,
1657 "Failed building TDLS channel switch resp frame\n");
1658 return NULL;
1659 }
1660
1661 if (ch_sw_tm_ie_offset) {
1662 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1663
1664 if (!tm_ie) {
1665 tdls_dbg(sdata,
1666 "No switch timing IE in TDLS switch resp\n");
1667 dev_kfree_skb_any(skb);
1668 return NULL;
1669 }
1670
1671 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1672 }
1673
1674 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1675 sta->sta.addr);
1676 return skb;
1677 }
1678
1679 static int
ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1680 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1681 struct sk_buff *skb)
1682 {
1683 struct ieee80211_local *local = sdata->local;
1684 struct ieee802_11_elems elems;
1685 struct sta_info *sta;
1686 struct ieee80211_tdls_data *tf = (void *)skb->data;
1687 bool local_initiator;
1688 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1689 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1690 struct ieee80211_tdls_ch_sw_params params = {};
1691 int ret;
1692
1693 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1694 params.timestamp = rx_status->device_timestamp;
1695
1696 if (skb->len < baselen) {
1697 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1698 skb->len);
1699 return -EINVAL;
1700 }
1701
1702 mutex_lock(&local->sta_mtx);
1703 sta = sta_info_get(sdata, tf->sa);
1704 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1705 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1706 tf->sa);
1707 ret = -EINVAL;
1708 goto out;
1709 }
1710
1711 params.sta = &sta->sta;
1712 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1713 if (params.status != 0) {
1714 ret = 0;
1715 goto call_drv;
1716 }
1717
1718 ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1719 skb->len - baselen, false, &elems);
1720 if (elems.parse_error) {
1721 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1722 ret = -EINVAL;
1723 goto out;
1724 }
1725
1726 if (!elems.ch_sw_timing || !elems.lnk_id) {
1727 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1728 ret = -EINVAL;
1729 goto out;
1730 }
1731
1732 /* validate the initiator is set correctly */
1733 local_initiator =
1734 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1735 if (local_initiator == sta->sta.tdls_initiator) {
1736 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1737 ret = -EINVAL;
1738 goto out;
1739 }
1740
1741 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1742 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1743
1744 params.tmpl_skb =
1745 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie);
1746 if (!params.tmpl_skb) {
1747 ret = -ENOENT;
1748 goto out;
1749 }
1750
1751 ret = 0;
1752 call_drv:
1753 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms);
1754
1755 tdls_dbg(sdata,
1756 "TDLS channel switch response received from %pM status %d\n",
1757 tf->sa, params.status);
1758
1759 out:
1760 mutex_unlock(&local->sta_mtx);
1761 dev_kfree_skb_any(params.tmpl_skb);
1762 return ret;
1763 }
1764
1765 static int
ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1766 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1767 struct sk_buff *skb)
1768 {
1769 struct ieee80211_local *local = sdata->local;
1770 struct ieee802_11_elems elems;
1771 struct cfg80211_chan_def chandef;
1772 struct ieee80211_channel *chan;
1773 enum nl80211_channel_type chan_type;
1774 int freq;
1775 u8 target_channel, oper_class;
1776 bool local_initiator;
1777 struct sta_info *sta;
1778 enum nl80211_band band;
1779 struct ieee80211_tdls_data *tf = (void *)skb->data;
1780 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1781 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1782 struct ieee80211_tdls_ch_sw_params params = {};
1783 int ret = 0;
1784
1785 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1786 params.timestamp = rx_status->device_timestamp;
1787
1788 if (skb->len < baselen) {
1789 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1790 skb->len);
1791 return -EINVAL;
1792 }
1793
1794 target_channel = tf->u.chan_switch_req.target_channel;
1795 oper_class = tf->u.chan_switch_req.oper_class;
1796
1797 /*
1798 * We can't easily infer the channel band. The operating class is
1799 * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1800 * solution here is to treat channels with number >14 as 5GHz ones,
1801 * and specifically check for the (oper_class, channel) combinations
1802 * where this doesn't hold. These are thankfully unique according to
1803 * IEEE802.11-2012.
1804 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1805 * valid here.
1806 */
1807 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1808 oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1809 target_channel < 14)
1810 band = NL80211_BAND_5GHZ;
1811 else
1812 band = target_channel < 14 ? NL80211_BAND_2GHZ :
1813 NL80211_BAND_5GHZ;
1814
1815 freq = ieee80211_channel_to_frequency(target_channel, band);
1816 if (freq == 0) {
1817 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1818 target_channel);
1819 return -EINVAL;
1820 }
1821
1822 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1823 if (!chan) {
1824 tdls_dbg(sdata,
1825 "Unsupported channel for TDLS chan switch: %d\n",
1826 target_channel);
1827 return -EINVAL;
1828 }
1829
1830 ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1831 skb->len - baselen, false, &elems);
1832 if (elems.parse_error) {
1833 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1834 return -EINVAL;
1835 }
1836
1837 if (!elems.ch_sw_timing || !elems.lnk_id) {
1838 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1839 return -EINVAL;
1840 }
1841
1842 if (!elems.sec_chan_offs) {
1843 chan_type = NL80211_CHAN_HT20;
1844 } else {
1845 switch (elems.sec_chan_offs->sec_chan_offs) {
1846 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1847 chan_type = NL80211_CHAN_HT40PLUS;
1848 break;
1849 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1850 chan_type = NL80211_CHAN_HT40MINUS;
1851 break;
1852 default:
1853 chan_type = NL80211_CHAN_HT20;
1854 break;
1855 }
1856 }
1857
1858 cfg80211_chandef_create(&chandef, chan, chan_type);
1859
1860 /* we will be active on the TDLS link */
1861 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1862 sdata->wdev.iftype)) {
1863 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1864 return -EINVAL;
1865 }
1866
1867 mutex_lock(&local->sta_mtx);
1868 sta = sta_info_get(sdata, tf->sa);
1869 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1870 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1871 tf->sa);
1872 ret = -EINVAL;
1873 goto out;
1874 }
1875
1876 params.sta = &sta->sta;
1877
1878 /* validate the initiator is set correctly */
1879 local_initiator =
1880 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1881 if (local_initiator == sta->sta.tdls_initiator) {
1882 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1883 ret = -EINVAL;
1884 goto out;
1885 }
1886
1887 /* peer should have known better */
1888 if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs &&
1889 elems.sec_chan_offs->sec_chan_offs) {
1890 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1891 ret = -ENOTSUPP;
1892 goto out;
1893 }
1894
1895 params.chandef = &chandef;
1896 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1897 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1898
1899 params.tmpl_skb =
1900 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1901 ¶ms.ch_sw_tm_ie);
1902 if (!params.tmpl_skb) {
1903 ret = -ENOENT;
1904 goto out;
1905 }
1906
1907 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms);
1908
1909 tdls_dbg(sdata,
1910 "TDLS ch switch request received from %pM ch %d width %d\n",
1911 tf->sa, params.chandef->chan->center_freq,
1912 params.chandef->width);
1913 out:
1914 mutex_unlock(&local->sta_mtx);
1915 dev_kfree_skb_any(params.tmpl_skb);
1916 return ret;
1917 }
1918
1919 static void
ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1920 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1921 struct sk_buff *skb)
1922 {
1923 struct ieee80211_tdls_data *tf = (void *)skb->data;
1924 struct wiphy *wiphy = sdata->local->hw.wiphy;
1925
1926 ASSERT_RTNL();
1927
1928 /* make sure the driver supports it */
1929 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1930 return;
1931
1932 /* we want to access the entire packet */
1933 if (skb_linearize(skb))
1934 return;
1935 /*
1936 * The packet/size was already validated by mac80211 Rx path, only look
1937 * at the action type.
1938 */
1939 switch (tf->action_code) {
1940 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1941 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1942 break;
1943 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1944 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1945 break;
1946 default:
1947 WARN_ON_ONCE(1);
1948 return;
1949 }
1950 }
1951
ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data * sdata)1952 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1953 {
1954 struct sta_info *sta;
1955 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1956
1957 rcu_read_lock();
1958 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1959 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1960 !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1961 continue;
1962
1963 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1964 NL80211_TDLS_TEARDOWN, reason,
1965 GFP_ATOMIC);
1966 }
1967 rcu_read_unlock();
1968 }
1969
ieee80211_tdls_chsw_work(struct work_struct * wk)1970 void ieee80211_tdls_chsw_work(struct work_struct *wk)
1971 {
1972 struct ieee80211_local *local =
1973 container_of(wk, struct ieee80211_local, tdls_chsw_work);
1974 struct ieee80211_sub_if_data *sdata;
1975 struct sk_buff *skb;
1976 struct ieee80211_tdls_data *tf;
1977
1978 rtnl_lock();
1979 while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) {
1980 tf = (struct ieee80211_tdls_data *)skb->data;
1981 list_for_each_entry(sdata, &local->interfaces, list) {
1982 if (!ieee80211_sdata_running(sdata) ||
1983 sdata->vif.type != NL80211_IFTYPE_STATION ||
1984 !ether_addr_equal(tf->da, sdata->vif.addr))
1985 continue;
1986
1987 ieee80211_process_tdls_channel_switch(sdata, skb);
1988 break;
1989 }
1990
1991 kfree_skb(skb);
1992 }
1993 rtnl_unlock();
1994 }
1995
