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TOMOYO Linux Cross Reference
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 
 20 /* give usermode some time for retries in setting up the TDLS session */
 21 #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ)
 22 
 23 void ieee80211_tdls_peer_del_work(struct work_struct *wk)
 24 {
 25         struct ieee80211_sub_if_data *sdata;
 26         struct ieee80211_local *local;
 27 
 28         sdata = container_of(wk, struct ieee80211_sub_if_data,
 29                              u.mgd.tdls_peer_del_work.work);
 30         local = sdata->local;
 31 
 32         mutex_lock(&local->mtx);
 33         if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
 34                 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
 35                 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
 36                 eth_zero_addr(sdata->u.mgd.tdls_peer);
 37         }
 38         mutex_unlock(&local->mtx);
 39 }
 40 
 41 static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata,
 42                                          struct sk_buff *skb)
 43 {
 44         struct ieee80211_local *local = sdata->local;
 45         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 46         bool chan_switch = local->hw.wiphy->features &
 47                            NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
 48         bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
 49                           !ifmgd->tdls_wider_bw_prohibited;
 50         enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
 51         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
 52         bool vht = sband && sband->vht_cap.vht_supported;
 53         u8 *pos = (void *)skb_put(skb, 10);
 54 
 55         *pos++ = WLAN_EID_EXT_CAPABILITY;
 56         *pos++ = 8; /* len */
 57         *pos++ = 0x0;
 58         *pos++ = 0x0;
 59         *pos++ = 0x0;
 60         *pos++ = chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0;
 61         *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
 62         *pos++ = 0;
 63         *pos++ = 0;
 64         *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
 65 }
 66 
 67 static u8
 68 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
 69                            struct sk_buff *skb, u16 start, u16 end,
 70                            u16 spacing)
 71 {
 72         u8 subband_cnt = 0, ch_cnt = 0;
 73         struct ieee80211_channel *ch;
 74         struct cfg80211_chan_def chandef;
 75         int i, subband_start;
 76         struct wiphy *wiphy = sdata->local->hw.wiphy;
 77 
 78         for (i = start; i <= end; i += spacing) {
 79                 if (!ch_cnt)
 80                         subband_start = i;
 81 
 82                 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
 83                 if (ch) {
 84                         /* we will be active on the channel */
 85                         cfg80211_chandef_create(&chandef, ch,
 86                                                 NL80211_CHAN_NO_HT);
 87                         if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
 88                                                           sdata->wdev.iftype)) {
 89                                 ch_cnt++;
 90                                 /*
 91                                  * check if the next channel is also part of
 92                                  * this allowed range
 93                                  */
 94                                 continue;
 95                         }
 96                 }
 97 
 98                 /*
 99                  * we've reached the end of a range, with allowed channels
100                  * found
101                  */
102                 if (ch_cnt) {
103                         u8 *pos = skb_put(skb, 2);
104                         *pos++ = ieee80211_frequency_to_channel(subband_start);
105                         *pos++ = ch_cnt;
106 
107                         subband_cnt++;
108                         ch_cnt = 0;
109                 }
110         }
111 
112         /* all channels in the requested range are allowed - add them here */
113         if (ch_cnt) {
114                 u8 *pos = skb_put(skb, 2);
115                 *pos++ = ieee80211_frequency_to_channel(subband_start);
116                 *pos++ = ch_cnt;
117 
118                 subband_cnt++;
119         }
120 
121         return subband_cnt;
122 }
123 
124 static void
125 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
126                                  struct sk_buff *skb)
127 {
128         /*
129          * Add possible channels for TDLS. These are channels that are allowed
130          * to be active.
131          */
132         u8 subband_cnt;
133         u8 *pos = skb_put(skb, 2);
134 
135         *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
136 
137         /*
138          * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
139          * this doesn't happen in real world scenarios.
140          */
141 
142         /* 2GHz, with 5MHz spacing */
143         subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
144 
145         /* 5GHz, with 20MHz spacing */
146         subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
147 
148         /* length */
149         *pos = 2 * subband_cnt;
150 }
151 
152 static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata,
153                                             struct sk_buff *skb)
154 {
155         u8 *pos;
156         u8 op_class;
157 
158         if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef,
159                                                   &op_class))
160                 return;
161 
162         pos = skb_put(skb, 4);
163         *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
164         *pos++ = 2; /* len */
165 
166         *pos++ = op_class;
167         *pos++ = op_class; /* give current operating class as alternate too */
168 }
169 
170 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
171 {
172         u8 *pos = (void *)skb_put(skb, 3);
173 
174         *pos++ = WLAN_EID_BSS_COEX_2040;
175         *pos++ = 1; /* len */
176 
177         *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
178 }
179 
180 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
181                                         u16 status_code)
182 {
183         /* The capability will be 0 when sending a failure code */
184         if (status_code != 0)
185                 return 0;
186 
187         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_2GHZ) {
188                 return WLAN_CAPABILITY_SHORT_SLOT_TIME |
189                        WLAN_CAPABILITY_SHORT_PREAMBLE;
190         }
191 
192         return 0;
193 }
194 
195 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
196                                        struct sk_buff *skb, const u8 *peer,
197                                        bool initiator)
198 {
199         struct ieee80211_tdls_lnkie *lnkid;
200         const u8 *init_addr, *rsp_addr;
201 
202         if (initiator) {
203                 init_addr = sdata->vif.addr;
204                 rsp_addr = peer;
205         } else {
206                 init_addr = peer;
207                 rsp_addr = sdata->vif.addr;
208         }
209 
210         lnkid = (void *)skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
211 
212         lnkid->ie_type = WLAN_EID_LINK_ID;
213         lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
214 
215         memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
216         memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
217         memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
218 }
219 
220 static void
221 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
222 {
223         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
224         u8 *pos = (void *)skb_put(skb, 4);
225 
226         *pos++ = WLAN_EID_AID;
227         *pos++ = 2; /* len */
228         put_unaligned_le16(ifmgd->aid, pos);
229 }
230 
231 /* translate numbering in the WMM parameter IE to the mac80211 notation */
232 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
233 {
234         switch (ac) {
235         default:
236                 WARN_ON_ONCE(1);
237         case 0:
238                 return IEEE80211_AC_BE;
239         case 1:
240                 return IEEE80211_AC_BK;
241         case 2:
242                 return IEEE80211_AC_VI;
243         case 3:
244                 return IEEE80211_AC_VO;
245         }
246 }
247 
248 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
249 {
250         u8 ret;
251 
252         ret = aifsn & 0x0f;
253         if (acm)
254                 ret |= 0x10;
255         ret |= (aci << 5) & 0x60;
256         return ret;
257 }
258 
259 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
260 {
261         return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
262                ((ilog2(cw_max + 1) << 0x4) & 0xf0);
263 }
264 
265 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
266                                             struct sk_buff *skb)
267 {
268         struct ieee80211_wmm_param_ie *wmm;
269         struct ieee80211_tx_queue_params *txq;
270         int i;
271 
272         wmm = (void *)skb_put(skb, sizeof(*wmm));
273         memset(wmm, 0, sizeof(*wmm));
274 
275         wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
276         wmm->len = sizeof(*wmm) - 2;
277 
278         wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
279         wmm->oui[1] = 0x50;
280         wmm->oui[2] = 0xf2;
281         wmm->oui_type = 2; /* WME */
282         wmm->oui_subtype = 1; /* WME param */
283         wmm->version = 1; /* WME ver */
284         wmm->qos_info = 0; /* U-APSD not in use */
285 
286         /*
287          * Use the EDCA parameters defined for the BSS, or default if the AP
288          * doesn't support it, as mandated by 802.11-2012 section 10.22.4
289          */
290         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
291                 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
292                 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
293                                                                txq->acm, i);
294                 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
295                 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
296         }
297 }
298 
299 static void
300 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
301                                    struct sta_info *sta)
302 {
303         /* IEEE802.11ac-2013 Table E-4 */
304         u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
305         struct cfg80211_chan_def uc = sta->tdls_chandef;
306         enum nl80211_chan_width max_width = ieee80211_sta_cap_chan_bw(sta);
307         int i;
308 
309         /* only support upgrading non-narrow channels up to 80Mhz */
310         if (max_width == NL80211_CHAN_WIDTH_5 ||
311             max_width == NL80211_CHAN_WIDTH_10)
312                 return;
313 
314         if (max_width > NL80211_CHAN_WIDTH_80)
315                 max_width = NL80211_CHAN_WIDTH_80;
316 
317         if (uc.width >= max_width)
318                 return;
319         /*
320          * Channel usage constrains in the IEEE802.11ac-2013 specification only
321          * allow expanding a 20MHz channel to 80MHz in a single way. In
322          * addition, there are no 40MHz allowed channels that are not part of
323          * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
324          */
325         for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
326                 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
327                         uc.center_freq1 = centers_80mhz[i];
328                         uc.center_freq2 = 0;
329                         uc.width = NL80211_CHAN_WIDTH_80;
330                         break;
331                 }
332 
333         if (!uc.center_freq1)
334                 return;
335 
336         /* proceed to downgrade the chandef until usable or the same */
337         while (uc.width > max_width ||
338                !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
339                                               sdata->wdev.iftype))
340                 ieee80211_chandef_downgrade(&uc);
341 
342         if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
343                 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
344                          sta->tdls_chandef.width, uc.width);
345 
346                 /*
347                  * the station is not yet authorized when BW upgrade is done,
348                  * locking is not required
349                  */
350                 sta->tdls_chandef = uc;
351         }
352 }
353 
354 static void
355 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
356                                    struct sk_buff *skb, const u8 *peer,
357                                    u8 action_code, bool initiator,
358                                    const u8 *extra_ies, size_t extra_ies_len)
359 {
360         enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
361         struct ieee80211_local *local = sdata->local;
362         struct ieee80211_supported_band *sband;
363         struct ieee80211_sta_ht_cap ht_cap;
364         struct ieee80211_sta_vht_cap vht_cap;
365         struct sta_info *sta = NULL;
366         size_t offset = 0, noffset;
367         u8 *pos;
368 
369         ieee80211_add_srates_ie(sdata, skb, false, band);
370         ieee80211_add_ext_srates_ie(sdata, skb, false, band);
371         ieee80211_tdls_add_supp_channels(sdata, skb);
372 
373         /* add any custom IEs that go before Extended Capabilities */
374         if (extra_ies_len) {
375                 static const u8 before_ext_cap[] = {
376                         WLAN_EID_SUPP_RATES,
377                         WLAN_EID_COUNTRY,
378                         WLAN_EID_EXT_SUPP_RATES,
379                         WLAN_EID_SUPPORTED_CHANNELS,
380                         WLAN_EID_RSN,
381                 };
382                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
383                                              before_ext_cap,
384                                              ARRAY_SIZE(before_ext_cap),
385                                              offset);
386                 pos = skb_put(skb, noffset - offset);
387                 memcpy(pos, extra_ies + offset, noffset - offset);
388                 offset = noffset;
389         }
390 
391         ieee80211_tdls_add_ext_capab(sdata, skb);
392 
393         /* add the QoS element if we support it */
394         if (local->hw.queues >= IEEE80211_NUM_ACS &&
395             action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
396                 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
397 
398         /* add any custom IEs that go before HT capabilities */
399         if (extra_ies_len) {
400                 static const u8 before_ht_cap[] = {
401                         WLAN_EID_SUPP_RATES,
402                         WLAN_EID_COUNTRY,
403                         WLAN_EID_EXT_SUPP_RATES,
404                         WLAN_EID_SUPPORTED_CHANNELS,
405                         WLAN_EID_RSN,
406                         WLAN_EID_EXT_CAPABILITY,
407                         WLAN_EID_QOS_CAPA,
408                         WLAN_EID_FAST_BSS_TRANSITION,
409                         WLAN_EID_TIMEOUT_INTERVAL,
410                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
411                 };
412                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
413                                              before_ht_cap,
414                                              ARRAY_SIZE(before_ht_cap),
415                                              offset);
416                 pos = skb_put(skb, noffset - offset);
417                 memcpy(pos, extra_ies + offset, noffset - offset);
418                 offset = noffset;
419         }
420 
421         mutex_lock(&local->sta_mtx);
422 
423         /* we should have the peer STA if we're already responding */
424         if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
425                 sta = sta_info_get(sdata, peer);
426                 if (WARN_ON_ONCE(!sta)) {
427                         mutex_unlock(&local->sta_mtx);
428                         return;
429                 }
430 
431                 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
432         }
433 
434         ieee80211_tdls_add_oper_classes(sdata, skb);
435 
436         /*
437          * with TDLS we can switch channels, and HT-caps are not necessarily
438          * the same on all bands. The specification limits the setup to a
439          * single HT-cap, so use the current band for now.
440          */
441         sband = local->hw.wiphy->bands[band];
442         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
443 
444         if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
445              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
446             ht_cap.ht_supported) {
447                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
448 
449                 /* disable SMPS in TDLS initiator */
450                 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
451                                 << IEEE80211_HT_CAP_SM_PS_SHIFT;
452 
453                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
454                 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
455         } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
456                    ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
457                 /* the peer caps are already intersected with our own */
458                 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
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         }
463 
464         if (ht_cap.ht_supported &&
465             (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
466                 ieee80211_tdls_add_bss_coex_ie(skb);
467 
468         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
469 
470         /* add any custom IEs that go before VHT capabilities */
471         if (extra_ies_len) {
472                 static const u8 before_vht_cap[] = {
473                         WLAN_EID_SUPP_RATES,
474                         WLAN_EID_COUNTRY,
475                         WLAN_EID_EXT_SUPP_RATES,
476                         WLAN_EID_SUPPORTED_CHANNELS,
477                         WLAN_EID_RSN,
478                         WLAN_EID_EXT_CAPABILITY,
479                         WLAN_EID_QOS_CAPA,
480                         WLAN_EID_FAST_BSS_TRANSITION,
481                         WLAN_EID_TIMEOUT_INTERVAL,
482                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
483                         WLAN_EID_MULTI_BAND,
484                 };
485                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
486                                              before_vht_cap,
487                                              ARRAY_SIZE(before_vht_cap),
488                                              offset);
489                 pos = skb_put(skb, noffset - offset);
490                 memcpy(pos, extra_ies + offset, noffset - offset);
491                 offset = noffset;
492         }
493 
494         /* build the VHT-cap similarly to the HT-cap */
495         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
496         if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
497              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
498             vht_cap.vht_supported) {
499                 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
500 
501                 /* the AID is present only when VHT is implemented */
502                 if (action_code == WLAN_TDLS_SETUP_REQUEST)
503                         ieee80211_tdls_add_aid(sdata, skb);
504 
505                 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
506                 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
507         } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
508                    vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
509                 /* the peer caps are already intersected with our own */
510                 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
511 
512                 /* the AID is present only when VHT is implemented */
513                 ieee80211_tdls_add_aid(sdata, skb);
514 
515                 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
516                 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
517 
518                 /*
519                  * if both peers support WIDER_BW, we can expand the chandef to
520                  * a wider compatible one, up to 80MHz
521                  */
522                 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
523                         ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
524         }
525 
526         mutex_unlock(&local->sta_mtx);
527 
528         /* add any remaining IEs */
529         if (extra_ies_len) {
530                 noffset = extra_ies_len;
531                 pos = skb_put(skb, noffset - offset);
532                 memcpy(pos, extra_ies + offset, noffset - offset);
533         }
534 
535 }
536 
537 static void
538 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
539                                  struct sk_buff *skb, const u8 *peer,
540                                  bool initiator, const u8 *extra_ies,
541                                  size_t extra_ies_len)
542 {
543         struct ieee80211_local *local = sdata->local;
544         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
545         size_t offset = 0, noffset;
546         struct sta_info *sta, *ap_sta;
547         enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
548         u8 *pos;
549 
550         mutex_lock(&local->sta_mtx);
551 
552         sta = sta_info_get(sdata, peer);
553         ap_sta = sta_info_get(sdata, ifmgd->bssid);
554         if (WARN_ON_ONCE(!sta || !ap_sta)) {
555                 mutex_unlock(&local->sta_mtx);
556                 return;
557         }
558 
559         sta->tdls_chandef = sdata->vif.bss_conf.chandef;
560 
561         /* add any custom IEs that go before the QoS IE */
562         if (extra_ies_len) {
563                 static const u8 before_qos[] = {
564                         WLAN_EID_RSN,
565                 };
566                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
567                                              before_qos,
568                                              ARRAY_SIZE(before_qos),
569                                              offset);
570                 pos = skb_put(skb, noffset - offset);
571                 memcpy(pos, extra_ies + offset, noffset - offset);
572                 offset = noffset;
573         }
574 
575         /* add the QoS param IE if both the peer and we support it */
576         if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
577                 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
578 
579         /* add any custom IEs that go before HT operation */
580         if (extra_ies_len) {
581                 static const u8 before_ht_op[] = {
582                         WLAN_EID_RSN,
583                         WLAN_EID_QOS_CAPA,
584                         WLAN_EID_FAST_BSS_TRANSITION,
585                         WLAN_EID_TIMEOUT_INTERVAL,
586                 };
587                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
588                                              before_ht_op,
589                                              ARRAY_SIZE(before_ht_op),
590                                              offset);
591                 pos = skb_put(skb, noffset - offset);
592                 memcpy(pos, extra_ies + offset, noffset - offset);
593                 offset = noffset;
594         }
595 
596         /*
597          * if HT support is only added in TDLS, we need an HT-operation IE.
598          * add the IE as required by IEEE802.11-2012 9.23.3.2.
599          */
600         if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
601                 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
602                            IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
603                            IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
604 
605                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
606                 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
607                                            &sdata->vif.bss_conf.chandef, prot,
608                                            true);
609         }
610 
611         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
612 
613         /* only include VHT-operation if not on the 2.4GHz band */
614         if (band != IEEE80211_BAND_2GHZ && sta->sta.vht_cap.vht_supported) {
615                 /*
616                  * if both peers support WIDER_BW, we can expand the chandef to
617                  * a wider compatible one, up to 80MHz
618                  */
619                 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
620                         ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
621 
622                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
623                 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
624                                             &sta->tdls_chandef);
625         }
626 
627         mutex_unlock(&local->sta_mtx);
628 
629         /* add any remaining IEs */
630         if (extra_ies_len) {
631                 noffset = extra_ies_len;
632                 pos = skb_put(skb, noffset - offset);
633                 memcpy(pos, extra_ies + offset, noffset - offset);
634         }
635 }
636 
637 static void
638 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
639                                        struct sk_buff *skb, const u8 *peer,
640                                        bool initiator, const u8 *extra_ies,
641                                        size_t extra_ies_len, u8 oper_class,
642                                        struct cfg80211_chan_def *chandef)
643 {
644         struct ieee80211_tdls_data *tf;
645         size_t offset = 0, noffset;
646         u8 *pos;
647 
648         if (WARN_ON_ONCE(!chandef))
649                 return;
650 
651         tf = (void *)skb->data;
652         tf->u.chan_switch_req.target_channel =
653                 ieee80211_frequency_to_channel(chandef->chan->center_freq);
654         tf->u.chan_switch_req.oper_class = oper_class;
655 
656         if (extra_ies_len) {
657                 static const u8 before_lnkie[] = {
658                         WLAN_EID_SECONDARY_CHANNEL_OFFSET,
659                 };
660                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
661                                              before_lnkie,
662                                              ARRAY_SIZE(before_lnkie),
663                                              offset);
664                 pos = skb_put(skb, noffset - offset);
665                 memcpy(pos, extra_ies + offset, noffset - offset);
666                 offset = noffset;
667         }
668 
669         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
670 
671         /* add any remaining IEs */
672         if (extra_ies_len) {
673                 noffset = extra_ies_len;
674                 pos = skb_put(skb, noffset - offset);
675                 memcpy(pos, extra_ies + offset, noffset - offset);
676         }
677 }
678 
679 static void
680 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
681                                         struct sk_buff *skb, const u8 *peer,
682                                         u16 status_code, bool initiator,
683                                         const u8 *extra_ies,
684                                         size_t extra_ies_len)
685 {
686         if (status_code == 0)
687                 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
688 
689         if (extra_ies_len)
690                 memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
691 }
692 
693 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
694                                    struct sk_buff *skb, const u8 *peer,
695                                    u8 action_code, u16 status_code,
696                                    bool initiator, const u8 *extra_ies,
697                                    size_t extra_ies_len, u8 oper_class,
698                                    struct cfg80211_chan_def *chandef)
699 {
700         switch (action_code) {
701         case WLAN_TDLS_SETUP_REQUEST:
702         case WLAN_TDLS_SETUP_RESPONSE:
703         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
704                 if (status_code == 0)
705                         ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
706                                                            action_code,
707                                                            initiator,
708                                                            extra_ies,
709                                                            extra_ies_len);
710                 break;
711         case WLAN_TDLS_SETUP_CONFIRM:
712                 if (status_code == 0)
713                         ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
714                                                          initiator, extra_ies,
715                                                          extra_ies_len);
716                 break;
717         case WLAN_TDLS_TEARDOWN:
718         case WLAN_TDLS_DISCOVERY_REQUEST:
719                 if (extra_ies_len)
720                         memcpy(skb_put(skb, extra_ies_len), extra_ies,
721                                extra_ies_len);
722                 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
723                         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
724                 break;
725         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
726                 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
727                                                        initiator, extra_ies,
728                                                        extra_ies_len,
729                                                        oper_class, chandef);
730                 break;
731         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
732                 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
733                                                         status_code,
734                                                         initiator, extra_ies,
735                                                         extra_ies_len);
736                 break;
737         }
738 
739 }
740 
741 static int
742 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
743                                const u8 *peer, u8 action_code, u8 dialog_token,
744                                u16 status_code, struct sk_buff *skb)
745 {
746         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
747         struct ieee80211_tdls_data *tf;
748 
749         tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
750 
751         memcpy(tf->da, peer, ETH_ALEN);
752         memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
753         tf->ether_type = cpu_to_be16(ETH_P_TDLS);
754         tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
755 
756         /* network header is after the ethernet header */
757         skb_set_network_header(skb, ETH_HLEN);
758 
759         switch (action_code) {
760         case WLAN_TDLS_SETUP_REQUEST:
761                 tf->category = WLAN_CATEGORY_TDLS;
762                 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
763 
764                 skb_put(skb, sizeof(tf->u.setup_req));
765                 tf->u.setup_req.dialog_token = dialog_token;
766                 tf->u.setup_req.capability =
767                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
768                                                                  status_code));
769                 break;
770         case WLAN_TDLS_SETUP_RESPONSE:
771                 tf->category = WLAN_CATEGORY_TDLS;
772                 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
773 
774                 skb_put(skb, sizeof(tf->u.setup_resp));
775                 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
776                 tf->u.setup_resp.dialog_token = dialog_token;
777                 tf->u.setup_resp.capability =
778                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
779                                                                  status_code));
780                 break;
781         case WLAN_TDLS_SETUP_CONFIRM:
782                 tf->category = WLAN_CATEGORY_TDLS;
783                 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
784 
785                 skb_put(skb, sizeof(tf->u.setup_cfm));
786                 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
787                 tf->u.setup_cfm.dialog_token = dialog_token;
788                 break;
789         case WLAN_TDLS_TEARDOWN:
790                 tf->category = WLAN_CATEGORY_TDLS;
791                 tf->action_code = WLAN_TDLS_TEARDOWN;
792 
793                 skb_put(skb, sizeof(tf->u.teardown));
794                 tf->u.teardown.reason_code = cpu_to_le16(status_code);
795                 break;
796         case WLAN_TDLS_DISCOVERY_REQUEST:
797                 tf->category = WLAN_CATEGORY_TDLS;
798                 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
799 
800                 skb_put(skb, sizeof(tf->u.discover_req));
801                 tf->u.discover_req.dialog_token = dialog_token;
802                 break;
803         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
804                 tf->category = WLAN_CATEGORY_TDLS;
805                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
806 
807                 skb_put(skb, sizeof(tf->u.chan_switch_req));
808                 break;
809         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
810                 tf->category = WLAN_CATEGORY_TDLS;
811                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
812 
813                 skb_put(skb, sizeof(tf->u.chan_switch_resp));
814                 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
815                 break;
816         default:
817                 return -EINVAL;
818         }
819 
820         return 0;
821 }
822 
823 static int
824 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
825                            const u8 *peer, u8 action_code, u8 dialog_token,
826                            u16 status_code, struct sk_buff *skb)
827 {
828         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
829         struct ieee80211_mgmt *mgmt;
830 
831         mgmt = (void *)skb_put(skb, 24);
832         memset(mgmt, 0, 24);
833         memcpy(mgmt->da, peer, ETH_ALEN);
834         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
835         memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
836 
837         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
838                                           IEEE80211_STYPE_ACTION);
839 
840         switch (action_code) {
841         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
842                 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
843                 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
844                 mgmt->u.action.u.tdls_discover_resp.action_code =
845                         WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
846                 mgmt->u.action.u.tdls_discover_resp.dialog_token =
847                         dialog_token;
848                 mgmt->u.action.u.tdls_discover_resp.capability =
849                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
850                                                                  status_code));
851                 break;
852         default:
853                 return -EINVAL;
854         }
855 
856         return 0;
857 }
858 
859 static struct sk_buff *
860 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
861                                       const u8 *peer, u8 action_code,
862                                       u8 dialog_token, u16 status_code,
863                                       bool initiator, const u8 *extra_ies,
864                                       size_t extra_ies_len, u8 oper_class,
865                                       struct cfg80211_chan_def *chandef)
866 {
867         struct ieee80211_local *local = sdata->local;
868         struct sk_buff *skb;
869         int ret;
870 
871         skb = netdev_alloc_skb(sdata->dev,
872                                local->hw.extra_tx_headroom +
873                                max(sizeof(struct ieee80211_mgmt),
874                                    sizeof(struct ieee80211_tdls_data)) +
875                                50 + /* supported rates */
876                                10 + /* ext capab */
877                                26 + /* max(WMM-info, WMM-param) */
878                                2 + max(sizeof(struct ieee80211_ht_cap),
879                                        sizeof(struct ieee80211_ht_operation)) +
880                                2 + max(sizeof(struct ieee80211_vht_cap),
881                                        sizeof(struct ieee80211_vht_operation)) +
882                                50 + /* supported channels */
883                                3 + /* 40/20 BSS coex */
884                                4 + /* AID */
885                                4 + /* oper classes */
886                                extra_ies_len +
887                                sizeof(struct ieee80211_tdls_lnkie));
888         if (!skb)
889                 return NULL;
890 
891         skb_reserve(skb, local->hw.extra_tx_headroom);
892 
893         switch (action_code) {
894         case WLAN_TDLS_SETUP_REQUEST:
895         case WLAN_TDLS_SETUP_RESPONSE:
896         case WLAN_TDLS_SETUP_CONFIRM:
897         case WLAN_TDLS_TEARDOWN:
898         case WLAN_TDLS_DISCOVERY_REQUEST:
899         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
900         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
901                 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
902                                                      sdata->dev, peer,
903                                                      action_code, dialog_token,
904                                                      status_code, skb);
905                 break;
906         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
907                 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
908                                                  peer, action_code,
909                                                  dialog_token, status_code,
910                                                  skb);
911                 break;
912         default:
913                 ret = -ENOTSUPP;
914                 break;
915         }
916 
917         if (ret < 0)
918                 goto fail;
919 
920         ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
921                                initiator, extra_ies, extra_ies_len, oper_class,
922                                chandef);
923         return skb;
924 
925 fail:
926         dev_kfree_skb(skb);
927         return NULL;
928 }
929 
930 static int
931 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
932                                 const u8 *peer, u8 action_code, u8 dialog_token,
933                                 u16 status_code, u32 peer_capability,
934                                 bool initiator, const u8 *extra_ies,
935                                 size_t extra_ies_len, u8 oper_class,
936                                 struct cfg80211_chan_def *chandef)
937 {
938         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
939         struct sk_buff *skb = NULL;
940         struct sta_info *sta;
941         u32 flags = 0;
942         int ret = 0;
943 
944         rcu_read_lock();
945         sta = sta_info_get(sdata, peer);
946 
947         /* infer the initiator if we can, to support old userspace */
948         switch (action_code) {
949         case WLAN_TDLS_SETUP_REQUEST:
950                 if (sta) {
951                         set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
952                         sta->sta.tdls_initiator = false;
953                 }
954                 /* fall-through */
955         case WLAN_TDLS_SETUP_CONFIRM:
956         case WLAN_TDLS_DISCOVERY_REQUEST:
957                 initiator = true;
958                 break;
959         case WLAN_TDLS_SETUP_RESPONSE:
960                 /*
961                  * In some testing scenarios, we send a request and response.
962                  * Make the last packet sent take effect for the initiator
963                  * value.
964                  */
965                 if (sta) {
966                         clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
967                         sta->sta.tdls_initiator = true;
968                 }
969                 /* fall-through */
970         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
971                 initiator = false;
972                 break;
973         case WLAN_TDLS_TEARDOWN:
974         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
975         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
976                 /* any value is ok */
977                 break;
978         default:
979                 ret = -ENOTSUPP;
980                 break;
981         }
982 
983         if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
984                 initiator = true;
985 
986         rcu_read_unlock();
987         if (ret < 0)
988                 goto fail;
989 
990         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
991                                                     dialog_token, status_code,
992                                                     initiator, extra_ies,
993                                                     extra_ies_len, oper_class,
994                                                     chandef);
995         if (!skb) {
996                 ret = -EINVAL;
997                 goto fail;
998         }
999 
1000         if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
1001                 ieee80211_tx_skb(sdata, skb);
1002                 return 0;
1003         }
1004 
1005         /*
1006          * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1007          * we should default to AC_VI.
1008          */
1009         switch (action_code) {
1010         case WLAN_TDLS_SETUP_REQUEST:
1011         case WLAN_TDLS_SETUP_RESPONSE:
1012                 skb_set_queue_mapping(skb, IEEE80211_AC_BK);
1013                 skb->priority = 2;
1014                 break;
1015         default:
1016                 skb_set_queue_mapping(skb, IEEE80211_AC_VI);
1017                 skb->priority = 5;
1018                 break;
1019         }
1020 
1021         /*
1022          * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1023          * Later, if no ACK is returned from peer, we will re-send the teardown
1024          * packet through the AP.
1025          */
1026         if ((action_code == WLAN_TDLS_TEARDOWN) &&
1027             ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1028                 bool try_resend; /* Should we keep skb for possible resend */
1029 
1030                 /* If not sending directly to peer - no point in keeping skb */
1031                 rcu_read_lock();
1032                 sta = sta_info_get(sdata, peer);
1033                 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1034                 rcu_read_unlock();
1035 
1036                 spin_lock_bh(&sdata->u.mgd.teardown_lock);
1037                 if (try_resend && !sdata->u.mgd.teardown_skb) {
1038                         /* Mark it as requiring TX status callback  */
1039                         flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1040                                  IEEE80211_TX_INTFL_MLME_CONN_TX;
1041 
1042                         /*
1043                          * skb is copied since mac80211 will later set
1044                          * properties that might not be the same as the AP,
1045                          * such as encryption, QoS, addresses, etc.
1046                          *
1047                          * No problem if skb_copy() fails, so no need to check.
1048                          */
1049                         sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1050                         sdata->u.mgd.orig_teardown_skb = skb;
1051                 }
1052                 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1053         }
1054 
1055         /* disable bottom halves when entering the Tx path */
1056         local_bh_disable();
1057         __ieee80211_subif_start_xmit(skb, dev, flags);
1058         local_bh_enable();
1059 
1060         return ret;
1061 
1062 fail:
1063         dev_kfree_skb(skb);
1064         return ret;
1065 }
1066 
1067 static int
1068 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1069                           const u8 *peer, u8 action_code, u8 dialog_token,
1070                           u16 status_code, u32 peer_capability, bool initiator,
1071                           const u8 *extra_ies, size_t extra_ies_len)
1072 {
1073         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1074         struct ieee80211_local *local = sdata->local;
1075         enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode;
1076         int ret;
1077 
1078         /* don't support setup with forced SMPS mode that's not off */
1079         if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1080             smps_mode != IEEE80211_SMPS_OFF) {
1081                 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1082                          smps_mode);
1083                 return -ENOTSUPP;
1084         }
1085 
1086         mutex_lock(&local->mtx);
1087 
1088         /* we don't support concurrent TDLS peer setups */
1089         if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1090             !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1091                 ret = -EBUSY;
1092                 goto out_unlock;
1093         }
1094 
1095         /*
1096          * make sure we have a STA representing the peer so we drop or buffer
1097          * non-TDLS-setup frames to the peer. We can't send other packets
1098          * during setup through the AP path.
1099          * Allow error packets to be sent - sometimes we don't even add a STA
1100          * before failing the setup.
1101          */
1102         if (status_code == 0) {
1103                 rcu_read_lock();
1104                 if (!sta_info_get(sdata, peer)) {
1105                         rcu_read_unlock();
1106                         ret = -ENOLINK;
1107                         goto out_unlock;
1108                 }
1109                 rcu_read_unlock();
1110         }
1111 
1112         ieee80211_flush_queues(local, sdata, false);
1113         memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1114         mutex_unlock(&local->mtx);
1115 
1116         /* we cannot take the mutex while preparing the setup packet */
1117         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1118                                               dialog_token, status_code,
1119                                               peer_capability, initiator,
1120                                               extra_ies, extra_ies_len, 0,
1121                                               NULL);
1122         if (ret < 0) {
1123                 mutex_lock(&local->mtx);
1124                 eth_zero_addr(sdata->u.mgd.tdls_peer);
1125                 mutex_unlock(&local->mtx);
1126                 return ret;
1127         }
1128 
1129         ieee80211_queue_delayed_work(&sdata->local->hw,
1130                                      &sdata->u.mgd.tdls_peer_del_work,
1131                                      TDLS_PEER_SETUP_TIMEOUT);
1132         return 0;
1133 
1134 out_unlock:
1135         mutex_unlock(&local->mtx);
1136         return ret;
1137 }
1138 
1139 static int
1140 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1141                              const u8 *peer, u8 action_code, u8 dialog_token,
1142                              u16 status_code, u32 peer_capability,
1143                              bool initiator, const u8 *extra_ies,
1144                              size_t extra_ies_len)
1145 {
1146         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1147         struct ieee80211_local *local = sdata->local;
1148         struct sta_info *sta;
1149         int ret;
1150 
1151         /*
1152          * No packets can be transmitted to the peer via the AP during setup -
1153          * the STA is set as a TDLS peer, but is not authorized.
1154          * During teardown, we prevent direct transmissions by stopping the
1155          * queues and flushing all direct packets.
1156          */
1157         ieee80211_stop_vif_queues(local, sdata,
1158                                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1159         ieee80211_flush_queues(local, sdata, false);
1160 
1161         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1162                                               dialog_token, status_code,
1163                                               peer_capability, initiator,
1164                                               extra_ies, extra_ies_len, 0,
1165                                               NULL);
1166         if (ret < 0)
1167                 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1168                           ret);
1169 
1170         /*
1171          * Remove the STA AUTH flag to force further traffic through the AP. If
1172          * the STA was unreachable, it was already removed.
1173          */
1174         rcu_read_lock();
1175         sta = sta_info_get(sdata, peer);
1176         if (sta)
1177                 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1178         rcu_read_unlock();
1179 
1180         ieee80211_wake_vif_queues(local, sdata,
1181                                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1182 
1183         return 0;
1184 }
1185 
1186 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1187                         const u8 *peer, u8 action_code, u8 dialog_token,
1188                         u16 status_code, u32 peer_capability,
1189                         bool initiator, const u8 *extra_ies,
1190                         size_t extra_ies_len)
1191 {
1192         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1193         int ret;
1194 
1195         if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1196                 return -ENOTSUPP;
1197 
1198         /* make sure we are in managed mode, and associated */
1199         if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1200             !sdata->u.mgd.associated)
1201                 return -EINVAL;
1202 
1203         switch (action_code) {
1204         case WLAN_TDLS_SETUP_REQUEST:
1205         case WLAN_TDLS_SETUP_RESPONSE:
1206                 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1207                                                 dialog_token, status_code,
1208                                                 peer_capability, initiator,
1209                                                 extra_ies, extra_ies_len);
1210                 break;
1211         case WLAN_TDLS_TEARDOWN:
1212                 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1213                                                    action_code, dialog_token,
1214                                                    status_code,
1215                                                    peer_capability, initiator,
1216                                                    extra_ies, extra_ies_len);
1217                 break;
1218         case WLAN_TDLS_DISCOVERY_REQUEST:
1219                 /*
1220                  * Protect the discovery so we can hear the TDLS discovery
1221                  * response frame. It is transmitted directly and not buffered
1222                  * by the AP.
1223                  */
1224                 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1225                 /* fall-through */
1226         case WLAN_TDLS_SETUP_CONFIRM:
1227         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1228                 /* no special handling */
1229                 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1230                                                       action_code,
1231                                                       dialog_token,
1232                                                       status_code,
1233                                                       peer_capability,
1234                                                       initiator, extra_ies,
1235                                                       extra_ies_len, 0, NULL);
1236                 break;
1237         default:
1238                 ret = -EOPNOTSUPP;
1239                 break;
1240         }
1241 
1242         tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1243                  action_code, peer, ret);
1244         return ret;
1245 }
1246 
1247 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1248                                          struct sta_info *sta)
1249 {
1250         struct ieee80211_local *local = sdata->local;
1251         struct ieee80211_chanctx_conf *conf;
1252         struct ieee80211_chanctx *ctx;
1253         enum nl80211_chan_width width;
1254         struct ieee80211_supported_band *sband;
1255 
1256         mutex_lock(&local->chanctx_mtx);
1257         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1258                                          lockdep_is_held(&local->chanctx_mtx));
1259         if (conf) {
1260                 width = conf->def.width;
1261                 sband = local->hw.wiphy->bands[conf->def.chan->band];
1262                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1263                 ieee80211_recalc_chanctx_chantype(local, ctx);
1264 
1265                 /* if width changed and a peer is given, update its BW */
1266                 if (width != conf->def.width && sta &&
1267                     test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1268                         enum ieee80211_sta_rx_bandwidth bw;
1269 
1270                         bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1271                         bw = min(bw, ieee80211_sta_cap_rx_bw(sta));
1272                         if (bw != sta->sta.bandwidth) {
1273                                 sta->sta.bandwidth = bw;
1274                                 rate_control_rate_update(local, sband, sta,
1275                                                          IEEE80211_RC_BW_CHANGED);
1276                                 /*
1277                                  * if a TDLS peer BW was updated, we need to
1278                                  * recalc the chandef width again, to get the
1279                                  * correct chanctx min_def
1280                                  */
1281                                 ieee80211_recalc_chanctx_chantype(local, ctx);
1282                         }
1283                 }
1284 
1285         }
1286         mutex_unlock(&local->chanctx_mtx);
1287 }
1288 
1289 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1290 {
1291         struct sta_info *sta;
1292         bool result = false;
1293 
1294         rcu_read_lock();
1295         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1296                 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1297                     !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1298                     !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1299                     !sta->sta.ht_cap.ht_supported)
1300                         continue;
1301                 result = true;
1302                 break;
1303         }
1304         rcu_read_unlock();
1305 
1306         return result;
1307 }
1308 
1309 static void
1310 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1311                                    struct sta_info *sta)
1312 {
1313         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1314         bool tdls_ht;
1315         u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1316                          IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1317                          IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1318         u16 opmode;
1319 
1320         /* Nothing to do if the BSS connection uses HT */
1321         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
1322                 return;
1323 
1324         tdls_ht = (sta && sta->sta.ht_cap.ht_supported) ||
1325                   iee80211_tdls_have_ht_peers(sdata);
1326 
1327         opmode = sdata->vif.bss_conf.ht_operation_mode;
1328 
1329         if (tdls_ht)
1330                 opmode |= protection;
1331         else
1332                 opmode &= ~protection;
1333 
1334         if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1335                 return;
1336 
1337         sdata->vif.bss_conf.ht_operation_mode = opmode;
1338         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT);
1339 }
1340 
1341 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1342                         const u8 *peer, enum nl80211_tdls_operation oper)
1343 {
1344         struct sta_info *sta;
1345         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1346         struct ieee80211_local *local = sdata->local;
1347         int ret;
1348 
1349         if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1350                 return -ENOTSUPP;
1351 
1352         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1353                 return -EINVAL;
1354 
1355         switch (oper) {
1356         case NL80211_TDLS_ENABLE_LINK:
1357         case NL80211_TDLS_DISABLE_LINK:
1358                 break;
1359         case NL80211_TDLS_TEARDOWN:
1360         case NL80211_TDLS_SETUP:
1361         case NL80211_TDLS_DISCOVERY_REQ:
1362                 /* We don't support in-driver setup/teardown/discovery */
1363                 return -ENOTSUPP;
1364         }
1365 
1366         /* protect possible bss_conf changes and avoid concurrency in
1367          * ieee80211_bss_info_change_notify()
1368          */
1369         sdata_lock(sdata);
1370         mutex_lock(&local->mtx);
1371         tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1372 
1373         switch (oper) {
1374         case NL80211_TDLS_ENABLE_LINK:
1375                 if (sdata->vif.csa_active) {
1376                         tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1377                         ret = -EBUSY;
1378                         break;
1379                 }
1380 
1381                 mutex_lock(&local->sta_mtx);
1382                 sta = sta_info_get(sdata, peer);
1383                 if (!sta) {
1384                         mutex_unlock(&local->sta_mtx);
1385                         ret = -ENOLINK;
1386                         break;
1387                 }
1388 
1389                 iee80211_tdls_recalc_chanctx(sdata, sta);
1390                 iee80211_tdls_recalc_ht_protection(sdata, sta);
1391 
1392                 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1393                 mutex_unlock(&local->sta_mtx);
1394 
1395                 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1396                              !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1397                 ret = 0;
1398                 break;
1399         case NL80211_TDLS_DISABLE_LINK:
1400                 /*
1401                  * The teardown message in ieee80211_tdls_mgmt_teardown() was
1402                  * created while the queues were stopped, so it might still be
1403                  * pending. Before flushing the queues we need to be sure the
1404                  * message is handled by the tasklet handling pending messages,
1405                  * otherwise we might start destroying the station before
1406                  * sending the teardown packet.
1407                  * Note that this only forces the tasklet to flush pendings -
1408                  * not to stop the tasklet from rescheduling itself.
1409                  */
1410                 tasklet_kill(&local->tx_pending_tasklet);
1411                 /* flush a potentially queued teardown packet */
1412                 ieee80211_flush_queues(local, sdata, false);
1413 
1414                 ret = sta_info_destroy_addr(sdata, peer);
1415 
1416                 mutex_lock(&local->sta_mtx);
1417                 iee80211_tdls_recalc_ht_protection(sdata, NULL);
1418                 mutex_unlock(&local->sta_mtx);
1419 
1420                 iee80211_tdls_recalc_chanctx(sdata, NULL);
1421                 break;
1422         default:
1423                 ret = -ENOTSUPP;
1424                 break;
1425         }
1426 
1427         if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1428                 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1429                 eth_zero_addr(sdata->u.mgd.tdls_peer);
1430         }
1431 
1432         if (ret == 0)
1433                 ieee80211_queue_work(&sdata->local->hw,
1434                                      &sdata->u.mgd.request_smps_work);
1435 
1436         mutex_unlock(&local->mtx);
1437         sdata_unlock(sdata);
1438         return ret;
1439 }
1440 
1441 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1442                                  enum nl80211_tdls_operation oper,
1443                                  u16 reason_code, gfp_t gfp)
1444 {
1445         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1446 
1447         if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1448                 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1449                           oper);
1450                 return;
1451         }
1452 
1453         cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1454 }
1455 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1456 
1457 static void
1458 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1459 {
1460         struct ieee80211_ch_switch_timing *ch_sw;
1461 
1462         *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1463         *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1464 
1465         ch_sw = (void *)buf;
1466         ch_sw->switch_time = cpu_to_le16(switch_time);
1467         ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1468 }
1469 
1470 /* find switch timing IE in SKB ready for Tx */
1471 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1472 {
1473         struct ieee80211_tdls_data *tf;
1474         const u8 *ie_start;
1475 
1476         /*
1477          * Get the offset for the new location of the switch timing IE.
1478          * The SKB network header will now point to the "payload_type"
1479          * element of the TDLS data frame struct.
1480          */
1481         tf = container_of(skb->data + skb_network_offset(skb),
1482                           struct ieee80211_tdls_data, payload_type);
1483         ie_start = tf->u.chan_switch_req.variable;
1484         return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1485                                 skb->len - (ie_start - skb->data));
1486 }
1487 
1488 static struct sk_buff *
1489 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1490                               struct cfg80211_chan_def *chandef,
1491                               u32 *ch_sw_tm_ie_offset)
1492 {
1493         struct ieee80211_sub_if_data *sdata = sta->sdata;
1494         u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1495                      2 + sizeof(struct ieee80211_ch_switch_timing)];
1496         int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1497         u8 *pos = extra_ies;
1498         struct sk_buff *skb;
1499 
1500         /*
1501          * if chandef points to a wide channel add a Secondary-Channel
1502          * Offset information element
1503          */
1504         if (chandef->width == NL80211_CHAN_WIDTH_40) {
1505                 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1506                 bool ht40plus;
1507 
1508                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1509                 *pos++ = sizeof(*sec_chan_ie);
1510                 sec_chan_ie = (void *)pos;
1511 
1512                 ht40plus = cfg80211_get_chandef_type(chandef) ==
1513                                                         NL80211_CHAN_HT40PLUS;
1514                 sec_chan_ie->sec_chan_offs = ht40plus ?
1515                                              IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1516                                              IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1517                 pos += sizeof(*sec_chan_ie);
1518 
1519                 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1520         }
1521 
1522         /* just set the values to 0, this is a template */
1523         iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1524 
1525         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1526                                               WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1527                                               0, 0, !sta->sta.tdls_initiator,
1528                                               extra_ies, extra_ies_len,
1529                                               oper_class, chandef);
1530         if (!skb)
1531                 return NULL;
1532 
1533         skb = ieee80211_build_data_template(sdata, skb, 0);
1534         if (IS_ERR(skb)) {
1535                 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1536                 return NULL;
1537         }
1538 
1539         if (ch_sw_tm_ie_offset) {
1540                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1541 
1542                 if (!tm_ie) {
1543                         tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1544                         dev_kfree_skb_any(skb);
1545                         return NULL;
1546                 }
1547 
1548                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1549         }
1550 
1551         tdls_dbg(sdata,
1552                  "TDLS channel switch request template for %pM ch %d width %d\n",
1553                  sta->sta.addr, chandef->chan->center_freq, chandef->width);
1554         return skb;
1555 }
1556 
1557 int
1558 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1559                               const u8 *addr, u8 oper_class,
1560                               struct cfg80211_chan_def *chandef)
1561 {
1562         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1563         struct ieee80211_local *local = sdata->local;
1564         struct sta_info *sta;
1565         struct sk_buff *skb = NULL;
1566         u32 ch_sw_tm_ie;
1567         int ret;
1568 
1569         mutex_lock(&local->sta_mtx);
1570         sta = sta_info_get(sdata, addr);
1571         if (!sta) {
1572                 tdls_dbg(sdata,
1573                          "Invalid TDLS peer %pM for channel switch request\n",
1574                          addr);
1575                 ret = -ENOENT;
1576                 goto out;
1577         }
1578 
1579         if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1580                 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1581                          addr);
1582                 ret = -ENOTSUPP;
1583                 goto out;
1584         }
1585 
1586         skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1587                                             &ch_sw_tm_ie);
1588         if (!skb) {
1589                 ret = -ENOENT;
1590                 goto out;
1591         }
1592 
1593         ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1594                                       chandef, skb, ch_sw_tm_ie);
1595         if (!ret)
1596                 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1597 
1598 out:
1599         mutex_unlock(&local->sta_mtx);
1600         dev_kfree_skb_any(skb);
1601         return ret;
1602 }
1603 
1604 void
1605 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1606                                      struct net_device *dev,
1607                                      const u8 *addr)
1608 {
1609         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1610         struct ieee80211_local *local = sdata->local;
1611         struct sta_info *sta;
1612 
1613         mutex_lock(&local->sta_mtx);
1614         sta = sta_info_get(sdata, addr);
1615         if (!sta) {
1616                 tdls_dbg(sdata,
1617                          "Invalid TDLS peer %pM for channel switch cancel\n",
1618                          addr);
1619                 goto out;
1620         }
1621 
1622         if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1623                 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1624                          addr);
1625                 goto out;
1626         }
1627 
1628         drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1629         clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1630 
1631 out:
1632         mutex_unlock(&local->sta_mtx);
1633 }
1634 
1635 static struct sk_buff *
1636 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1637                                    u32 *ch_sw_tm_ie_offset)
1638 {
1639         struct ieee80211_sub_if_data *sdata = sta->sdata;
1640         struct sk_buff *skb;
1641         u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1642 
1643         /* initial timing are always zero in the template */
1644         iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1645 
1646         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1647                                         WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1648                                         0, 0, !sta->sta.tdls_initiator,
1649                                         extra_ies, sizeof(extra_ies), 0, NULL);
1650         if (!skb)
1651                 return NULL;
1652 
1653         skb = ieee80211_build_data_template(sdata, skb, 0);
1654         if (IS_ERR(skb)) {
1655                 tdls_dbg(sdata,
1656                          "Failed building TDLS channel switch resp frame\n");
1657                 return NULL;
1658         }
1659 
1660         if (ch_sw_tm_ie_offset) {
1661                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1662 
1663                 if (!tm_ie) {
1664                         tdls_dbg(sdata,
1665                                  "No switch timing IE in TDLS switch resp\n");
1666                         dev_kfree_skb_any(skb);
1667                         return NULL;
1668                 }
1669 
1670                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1671         }
1672 
1673         tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1674                  sta->sta.addr);
1675         return skb;
1676 }
1677 
1678 static int
1679 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1680                                            struct sk_buff *skb)
1681 {
1682         struct ieee80211_local *local = sdata->local;
1683         struct ieee802_11_elems elems;
1684         struct sta_info *sta;
1685         struct ieee80211_tdls_data *tf = (void *)skb->data;
1686         bool local_initiator;
1687         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1688         int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1689         struct ieee80211_tdls_ch_sw_params params = {};
1690         int ret;
1691 
1692         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1693         params.timestamp = rx_status->device_timestamp;
1694 
1695         if (skb->len < baselen) {
1696                 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1697                          skb->len);
1698                 return -EINVAL;
1699         }
1700 
1701         mutex_lock(&local->sta_mtx);
1702         sta = sta_info_get(sdata, tf->sa);
1703         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1704                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1705                          tf->sa);
1706                 ret = -EINVAL;
1707                 goto out;
1708         }
1709 
1710         params.sta = &sta->sta;
1711         params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1712         if (params.status != 0) {
1713                 ret = 0;
1714                 goto call_drv;
1715         }
1716 
1717         ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1718                                skb->len - baselen, false, &elems);
1719         if (elems.parse_error) {
1720                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1721                 ret = -EINVAL;
1722                 goto out;
1723         }
1724 
1725         if (!elems.ch_sw_timing || !elems.lnk_id) {
1726                 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1727                 ret = -EINVAL;
1728                 goto out;
1729         }
1730 
1731         /* validate the initiator is set correctly */
1732         local_initiator =
1733                 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1734         if (local_initiator == sta->sta.tdls_initiator) {
1735                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1736                 ret = -EINVAL;
1737                 goto out;
1738         }
1739 
1740         params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1741         params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1742 
1743         params.tmpl_skb =
1744                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1745         if (!params.tmpl_skb) {
1746                 ret = -ENOENT;
1747                 goto out;
1748         }
1749 
1750 call_drv:
1751         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1752 
1753         tdls_dbg(sdata,
1754                  "TDLS channel switch response received from %pM status %d\n",
1755                  tf->sa, params.status);
1756 
1757 out:
1758         mutex_unlock(&local->sta_mtx);
1759         dev_kfree_skb_any(params.tmpl_skb);
1760         return ret;
1761 }
1762 
1763 static int
1764 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1765                                           struct sk_buff *skb)
1766 {
1767         struct ieee80211_local *local = sdata->local;
1768         struct ieee802_11_elems elems;
1769         struct cfg80211_chan_def chandef;
1770         struct ieee80211_channel *chan;
1771         enum nl80211_channel_type chan_type;
1772         int freq;
1773         u8 target_channel, oper_class;
1774         bool local_initiator;
1775         struct sta_info *sta;
1776         enum ieee80211_band band;
1777         struct ieee80211_tdls_data *tf = (void *)skb->data;
1778         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1779         int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1780         struct ieee80211_tdls_ch_sw_params params = {};
1781         int ret = 0;
1782 
1783         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1784         params.timestamp = rx_status->device_timestamp;
1785 
1786         if (skb->len < baselen) {
1787                 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1788                          skb->len);
1789                 return -EINVAL;
1790         }
1791 
1792         target_channel = tf->u.chan_switch_req.target_channel;
1793         oper_class = tf->u.chan_switch_req.oper_class;
1794 
1795         /*
1796          * We can't easily infer the channel band. The operating class is
1797          * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1798          * solution here is to treat channels with number >14 as 5GHz ones,
1799          * and specifically check for the (oper_class, channel) combinations
1800          * where this doesn't hold. These are thankfully unique according to
1801          * IEEE802.11-2012.
1802          * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1803          * valid here.
1804          */
1805         if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1806              oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1807              target_channel < 14)
1808                 band = IEEE80211_BAND_5GHZ;
1809         else
1810                 band = target_channel < 14 ? IEEE80211_BAND_2GHZ :
1811                                              IEEE80211_BAND_5GHZ;
1812 
1813         freq = ieee80211_channel_to_frequency(target_channel, band);
1814         if (freq == 0) {
1815                 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1816                          target_channel);
1817                 return -EINVAL;
1818         }
1819 
1820         chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1821         if (!chan) {
1822                 tdls_dbg(sdata,
1823                          "Unsupported channel for TDLS chan switch: %d\n",
1824                          target_channel);
1825                 return -EINVAL;
1826         }
1827 
1828         ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1829                                skb->len - baselen, false, &elems);
1830         if (elems.parse_error) {
1831                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1832                 return -EINVAL;
1833         }
1834 
1835         if (!elems.ch_sw_timing || !elems.lnk_id) {
1836                 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1837                 return -EINVAL;
1838         }
1839 
1840         if (!elems.sec_chan_offs) {
1841                 chan_type = NL80211_CHAN_HT20;
1842         } else {
1843                 switch (elems.sec_chan_offs->sec_chan_offs) {
1844                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1845                         chan_type = NL80211_CHAN_HT40PLUS;
1846                         break;
1847                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1848                         chan_type = NL80211_CHAN_HT40MINUS;
1849                         break;
1850                 default:
1851                         chan_type = NL80211_CHAN_HT20;
1852                         break;
1853                 }
1854         }
1855 
1856         cfg80211_chandef_create(&chandef, chan, chan_type);
1857 
1858         /* we will be active on the TDLS link */
1859         if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1860                                            sdata->wdev.iftype)) {
1861                 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1862                 return -EINVAL;
1863         }
1864 
1865         mutex_lock(&local->sta_mtx);
1866         sta = sta_info_get(sdata, tf->sa);
1867         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1868                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1869                          tf->sa);
1870                 ret = -EINVAL;
1871                 goto out;
1872         }
1873 
1874         params.sta = &sta->sta;
1875 
1876         /* validate the initiator is set correctly */
1877         local_initiator =
1878                 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1879         if (local_initiator == sta->sta.tdls_initiator) {
1880                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1881                 ret = -EINVAL;
1882                 goto out;
1883         }
1884 
1885         /* peer should have known better */
1886         if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs &&
1887             elems.sec_chan_offs->sec_chan_offs) {
1888                 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1889                 ret = -ENOTSUPP;
1890                 goto out;
1891         }
1892 
1893         params.chandef = &chandef;
1894         params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1895         params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1896 
1897         params.tmpl_skb =
1898                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1899                                                    &params.ch_sw_tm_ie);
1900         if (!params.tmpl_skb) {
1901                 ret = -ENOENT;
1902                 goto out;
1903         }
1904 
1905         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1906 
1907         tdls_dbg(sdata,
1908                  "TDLS ch switch request received from %pM ch %d width %d\n",
1909                  tf->sa, params.chandef->chan->center_freq,
1910                  params.chandef->width);
1911 out:
1912         mutex_unlock(&local->sta_mtx);
1913         dev_kfree_skb_any(params.tmpl_skb);
1914         return ret;
1915 }
1916 
1917 static void
1918 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1919                                       struct sk_buff *skb)
1920 {
1921         struct ieee80211_tdls_data *tf = (void *)skb->data;
1922         struct wiphy *wiphy = sdata->local->hw.wiphy;
1923 
1924         ASSERT_RTNL();
1925 
1926         /* make sure the driver supports it */
1927         if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1928                 return;
1929 
1930         /* we want to access the entire packet */
1931         if (skb_linearize(skb))
1932                 return;
1933         /*
1934          * The packet/size was already validated by mac80211 Rx path, only look
1935          * at the action type.
1936          */
1937         switch (tf->action_code) {
1938         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1939                 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1940                 break;
1941         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1942                 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1943                 break;
1944         default:
1945                 WARN_ON_ONCE(1);
1946                 return;
1947         }
1948 }
1949 
1950 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1951 {
1952         struct sta_info *sta;
1953         u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1954 
1955         rcu_read_lock();
1956         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1957                 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1958                     !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1959                         continue;
1960 
1961                 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1962                                             NL80211_TDLS_TEARDOWN, reason,
1963                                             GFP_ATOMIC);
1964         }
1965         rcu_read_unlock();
1966 }
1967 
1968 void ieee80211_tdls_chsw_work(struct work_struct *wk)
1969 {
1970         struct ieee80211_local *local =
1971                 container_of(wk, struct ieee80211_local, tdls_chsw_work);
1972         struct ieee80211_sub_if_data *sdata;
1973         struct sk_buff *skb;
1974         struct ieee80211_tdls_data *tf;
1975 
1976         rtnl_lock();
1977         while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) {
1978                 tf = (struct ieee80211_tdls_data *)skb->data;
1979                 list_for_each_entry(sdata, &local->interfaces, list) {
1980                         if (!ieee80211_sdata_running(sdata) ||
1981                             sdata->vif.type != NL80211_IFTYPE_STATION ||
1982                             !ether_addr_equal(tf->da, sdata->vif.addr))
1983                                 continue;
1984 
1985                         ieee80211_process_tdls_channel_switch(sdata, skb);
1986                         break;
1987                 }
1988 
1989                 kfree_skb(skb);
1990         }
1991         rtnl_unlock();
1992 }
1993 

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