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Linux/net/mac80211/tdls.c

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  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 
 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 
 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
 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
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 
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 
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 
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 
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
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 */
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 
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 
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 
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
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
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
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
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
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 
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
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
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 *
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
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
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
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 
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 
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 
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
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 
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 
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
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 */
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 *
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
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
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 *
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
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, &params.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, &params);
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
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                                                    &params.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, &params);
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
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 
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 
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 

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