~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/mac80211/tdls.c

Version: ~ [ linux-5.2-rc5 ] ~ [ linux-5.1.12 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.53 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.128 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.182 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.182 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.68 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 nl80211_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) == NL80211_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 as AP BW */
337         while (uc.width > max_width ||
338                (uc.width > sta->tdls_chandef.width &&
339                 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
340                                                sdata->wdev.iftype)))
341                 ieee80211_chandef_downgrade(&uc);
342 
343         if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
344                 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
345                          sta->tdls_chandef.width, uc.width);
346 
347                 /*
348                  * the station is not yet authorized when BW upgrade is done,
349                  * locking is not required
350                  */
351                 sta->tdls_chandef = uc;
352         }
353 }
354 
355 static void
356 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
357                                    struct sk_buff *skb, const u8 *peer,
358                                    u8 action_code, bool initiator,
359                                    const u8 *extra_ies, size_t extra_ies_len)
360 {
361         enum nl80211_band band = ieee80211_get_sdata_band(sdata);
362         struct ieee80211_local *local = sdata->local;
363         struct ieee80211_supported_band *sband;
364         struct ieee80211_sta_ht_cap ht_cap;
365         struct ieee80211_sta_vht_cap vht_cap;
366         struct sta_info *sta = NULL;
367         size_t offset = 0, noffset;
368         u8 *pos;
369 
370         ieee80211_add_srates_ie(sdata, skb, false, band);
371         ieee80211_add_ext_srates_ie(sdata, skb, false, band);
372         ieee80211_tdls_add_supp_channels(sdata, skb);
373 
374         /* add any custom IEs that go before Extended Capabilities */
375         if (extra_ies_len) {
376                 static const u8 before_ext_cap[] = {
377                         WLAN_EID_SUPP_RATES,
378                         WLAN_EID_COUNTRY,
379                         WLAN_EID_EXT_SUPP_RATES,
380                         WLAN_EID_SUPPORTED_CHANNELS,
381                         WLAN_EID_RSN,
382                 };
383                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
384                                              before_ext_cap,
385                                              ARRAY_SIZE(before_ext_cap),
386                                              offset);
387                 pos = skb_put(skb, noffset - offset);
388                 memcpy(pos, extra_ies + offset, noffset - offset);
389                 offset = noffset;
390         }
391 
392         ieee80211_tdls_add_ext_capab(sdata, skb);
393 
394         /* add the QoS element if we support it */
395         if (local->hw.queues >= IEEE80211_NUM_ACS &&
396             action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
397                 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
398 
399         /* add any custom IEs that go before HT capabilities */
400         if (extra_ies_len) {
401                 static const u8 before_ht_cap[] = {
402                         WLAN_EID_SUPP_RATES,
403                         WLAN_EID_COUNTRY,
404                         WLAN_EID_EXT_SUPP_RATES,
405                         WLAN_EID_SUPPORTED_CHANNELS,
406                         WLAN_EID_RSN,
407                         WLAN_EID_EXT_CAPABILITY,
408                         WLAN_EID_QOS_CAPA,
409                         WLAN_EID_FAST_BSS_TRANSITION,
410                         WLAN_EID_TIMEOUT_INTERVAL,
411                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
412                 };
413                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
414                                              before_ht_cap,
415                                              ARRAY_SIZE(before_ht_cap),
416                                              offset);
417                 pos = skb_put(skb, noffset - offset);
418                 memcpy(pos, extra_ies + offset, noffset - offset);
419                 offset = noffset;
420         }
421 
422         mutex_lock(&local->sta_mtx);
423 
424         /* we should have the peer STA if we're already responding */
425         if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
426                 sta = sta_info_get(sdata, peer);
427                 if (WARN_ON_ONCE(!sta)) {
428                         mutex_unlock(&local->sta_mtx);
429                         return;
430                 }
431 
432                 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
433         }
434 
435         ieee80211_tdls_add_oper_classes(sdata, skb);
436 
437         /*
438          * with TDLS we can switch channels, and HT-caps are not necessarily
439          * the same on all bands. The specification limits the setup to a
440          * single HT-cap, so use the current band for now.
441          */
442         sband = local->hw.wiphy->bands[band];
443         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
444 
445         if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
446              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
447             ht_cap.ht_supported) {
448                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
449 
450                 /* disable SMPS in TDLS initiator */
451                 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
452                                 << IEEE80211_HT_CAP_SM_PS_SHIFT;
453 
454                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
455                 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
456         } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
457                    ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
458                 /* the peer caps are already intersected with our own */
459                 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
460 
461                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
462                 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
463         }
464 
465         if (ht_cap.ht_supported &&
466             (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
467                 ieee80211_tdls_add_bss_coex_ie(skb);
468 
469         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
470 
471         /* add any custom IEs that go before VHT capabilities */
472         if (extra_ies_len) {
473                 static const u8 before_vht_cap[] = {
474                         WLAN_EID_SUPP_RATES,
475                         WLAN_EID_COUNTRY,
476                         WLAN_EID_EXT_SUPP_RATES,
477                         WLAN_EID_SUPPORTED_CHANNELS,
478                         WLAN_EID_RSN,
479                         WLAN_EID_EXT_CAPABILITY,
480                         WLAN_EID_QOS_CAPA,
481                         WLAN_EID_FAST_BSS_TRANSITION,
482                         WLAN_EID_TIMEOUT_INTERVAL,
483                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
484                         WLAN_EID_MULTI_BAND,
485                 };
486                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
487                                              before_vht_cap,
488                                              ARRAY_SIZE(before_vht_cap),
489                                              offset);
490                 pos = skb_put(skb, noffset - offset);
491                 memcpy(pos, extra_ies + offset, noffset - offset);
492                 offset = noffset;
493         }
494 
495         /* build the VHT-cap similarly to the HT-cap */
496         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
497         if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
498              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
499             vht_cap.vht_supported) {
500                 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
501 
502                 /* the AID is present only when VHT is implemented */
503                 if (action_code == WLAN_TDLS_SETUP_REQUEST)
504                         ieee80211_tdls_add_aid(sdata, skb);
505 
506                 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
507                 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
508         } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
509                    vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
510                 /* the peer caps are already intersected with our own */
511                 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
512 
513                 /* the AID is present only when VHT is implemented */
514                 ieee80211_tdls_add_aid(sdata, skb);
515 
516                 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
517                 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
518 
519                 /*
520                  * if both peers support WIDER_BW, we can expand the chandef to
521                  * a wider compatible one, up to 80MHz
522                  */
523                 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
524                         ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
525         }
526 
527         mutex_unlock(&local->sta_mtx);
528 
529         /* add any remaining IEs */
530         if (extra_ies_len) {
531                 noffset = extra_ies_len;
532                 pos = skb_put(skb, noffset - offset);
533                 memcpy(pos, extra_ies + offset, noffset - offset);
534         }
535 
536 }
537 
538 static void
539 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
540                                  struct sk_buff *skb, const u8 *peer,
541                                  bool initiator, const u8 *extra_ies,
542                                  size_t extra_ies_len)
543 {
544         struct ieee80211_local *local = sdata->local;
545         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
546         size_t offset = 0, noffset;
547         struct sta_info *sta, *ap_sta;
548         enum nl80211_band band = ieee80211_get_sdata_band(sdata);
549         u8 *pos;
550 
551         mutex_lock(&local->sta_mtx);
552 
553         sta = sta_info_get(sdata, peer);
554         ap_sta = sta_info_get(sdata, ifmgd->bssid);
555         if (WARN_ON_ONCE(!sta || !ap_sta)) {
556                 mutex_unlock(&local->sta_mtx);
557                 return;
558         }
559 
560         sta->tdls_chandef = sdata->vif.bss_conf.chandef;
561 
562         /* add any custom IEs that go before the QoS IE */
563         if (extra_ies_len) {
564                 static const u8 before_qos[] = {
565                         WLAN_EID_RSN,
566                 };
567                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
568                                              before_qos,
569                                              ARRAY_SIZE(before_qos),
570                                              offset);
571                 pos = skb_put(skb, noffset - offset);
572                 memcpy(pos, extra_ies + offset, noffset - offset);
573                 offset = noffset;
574         }
575 
576         /* add the QoS param IE if both the peer and we support it */
577         if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
578                 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
579 
580         /* add any custom IEs that go before HT operation */
581         if (extra_ies_len) {
582                 static const u8 before_ht_op[] = {
583                         WLAN_EID_RSN,
584                         WLAN_EID_QOS_CAPA,
585                         WLAN_EID_FAST_BSS_TRANSITION,
586                         WLAN_EID_TIMEOUT_INTERVAL,
587                 };
588                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
589                                              before_ht_op,
590                                              ARRAY_SIZE(before_ht_op),
591                                              offset);
592                 pos = skb_put(skb, noffset - offset);
593                 memcpy(pos, extra_ies + offset, noffset - offset);
594                 offset = noffset;
595         }
596 
597         /*
598          * if HT support is only added in TDLS, we need an HT-operation IE.
599          * add the IE as required by IEEE802.11-2012 9.23.3.2.
600          */
601         if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
602                 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
603                            IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
604                            IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
605 
606                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
607                 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
608                                            &sdata->vif.bss_conf.chandef, prot,
609                                            true);
610         }
611 
612         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
613 
614         /* only include VHT-operation if not on the 2.4GHz band */
615         if (band != NL80211_BAND_2GHZ && sta->sta.vht_cap.vht_supported) {
616                 /*
617                  * if both peers support WIDER_BW, we can expand the chandef to
618                  * a wider compatible one, up to 80MHz
619                  */
620                 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
621                         ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
622 
623                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
624                 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
625                                             &sta->tdls_chandef);
626         }
627 
628         mutex_unlock(&local->sta_mtx);
629 
630         /* add any remaining IEs */
631         if (extra_ies_len) {
632                 noffset = extra_ies_len;
633                 pos = skb_put(skb, noffset - offset);
634                 memcpy(pos, extra_ies + offset, noffset - offset);
635         }
636 }
637 
638 static void
639 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
640                                        struct sk_buff *skb, const u8 *peer,
641                                        bool initiator, const u8 *extra_ies,
642                                        size_t extra_ies_len, u8 oper_class,
643                                        struct cfg80211_chan_def *chandef)
644 {
645         struct ieee80211_tdls_data *tf;
646         size_t offset = 0, noffset;
647         u8 *pos;
648 
649         if (WARN_ON_ONCE(!chandef))
650                 return;
651 
652         tf = (void *)skb->data;
653         tf->u.chan_switch_req.target_channel =
654                 ieee80211_frequency_to_channel(chandef->chan->center_freq);
655         tf->u.chan_switch_req.oper_class = oper_class;
656 
657         if (extra_ies_len) {
658                 static const u8 before_lnkie[] = {
659                         WLAN_EID_SECONDARY_CHANNEL_OFFSET,
660                 };
661                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
662                                              before_lnkie,
663                                              ARRAY_SIZE(before_lnkie),
664                                              offset);
665                 pos = skb_put(skb, noffset - offset);
666                 memcpy(pos, extra_ies + offset, noffset - offset);
667                 offset = noffset;
668         }
669 
670         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
671 
672         /* add any remaining IEs */
673         if (extra_ies_len) {
674                 noffset = extra_ies_len;
675                 pos = skb_put(skb, noffset - offset);
676                 memcpy(pos, extra_ies + offset, noffset - offset);
677         }
678 }
679 
680 static void
681 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
682                                         struct sk_buff *skb, const u8 *peer,
683                                         u16 status_code, bool initiator,
684                                         const u8 *extra_ies,
685                                         size_t extra_ies_len)
686 {
687         if (status_code == 0)
688                 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
689 
690         if (extra_ies_len)
691                 memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
692 }
693 
694 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
695                                    struct sk_buff *skb, const u8 *peer,
696                                    u8 action_code, u16 status_code,
697                                    bool initiator, const u8 *extra_ies,
698                                    size_t extra_ies_len, u8 oper_class,
699                                    struct cfg80211_chan_def *chandef)
700 {
701         switch (action_code) {
702         case WLAN_TDLS_SETUP_REQUEST:
703         case WLAN_TDLS_SETUP_RESPONSE:
704         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
705                 if (status_code == 0)
706                         ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
707                                                            action_code,
708                                                            initiator,
709                                                            extra_ies,
710                                                            extra_ies_len);
711                 break;
712         case WLAN_TDLS_SETUP_CONFIRM:
713                 if (status_code == 0)
714                         ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
715                                                          initiator, extra_ies,
716                                                          extra_ies_len);
717                 break;
718         case WLAN_TDLS_TEARDOWN:
719         case WLAN_TDLS_DISCOVERY_REQUEST:
720                 if (extra_ies_len)
721                         memcpy(skb_put(skb, extra_ies_len), extra_ies,
722                                extra_ies_len);
723                 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
724                         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
725                 break;
726         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
727                 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
728                                                        initiator, extra_ies,
729                                                        extra_ies_len,
730                                                        oper_class, chandef);
731                 break;
732         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
733                 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
734                                                         status_code,
735                                                         initiator, extra_ies,
736                                                         extra_ies_len);
737                 break;
738         }
739 
740 }
741 
742 static int
743 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
744                                const u8 *peer, u8 action_code, u8 dialog_token,
745                                u16 status_code, struct sk_buff *skb)
746 {
747         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
748         struct ieee80211_tdls_data *tf;
749 
750         tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
751 
752         memcpy(tf->da, peer, ETH_ALEN);
753         memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
754         tf->ether_type = cpu_to_be16(ETH_P_TDLS);
755         tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
756 
757         /* network header is after the ethernet header */
758         skb_set_network_header(skb, ETH_HLEN);
759 
760         switch (action_code) {
761         case WLAN_TDLS_SETUP_REQUEST:
762                 tf->category = WLAN_CATEGORY_TDLS;
763                 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
764 
765                 skb_put(skb, sizeof(tf->u.setup_req));
766                 tf->u.setup_req.dialog_token = dialog_token;
767                 tf->u.setup_req.capability =
768                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
769                                                                  status_code));
770                 break;
771         case WLAN_TDLS_SETUP_RESPONSE:
772                 tf->category = WLAN_CATEGORY_TDLS;
773                 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
774 
775                 skb_put(skb, sizeof(tf->u.setup_resp));
776                 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
777                 tf->u.setup_resp.dialog_token = dialog_token;
778                 tf->u.setup_resp.capability =
779                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
780                                                                  status_code));
781                 break;
782         case WLAN_TDLS_SETUP_CONFIRM:
783                 tf->category = WLAN_CATEGORY_TDLS;
784                 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
785 
786                 skb_put(skb, sizeof(tf->u.setup_cfm));
787                 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
788                 tf->u.setup_cfm.dialog_token = dialog_token;
789                 break;
790         case WLAN_TDLS_TEARDOWN:
791                 tf->category = WLAN_CATEGORY_TDLS;
792                 tf->action_code = WLAN_TDLS_TEARDOWN;
793 
794                 skb_put(skb, sizeof(tf->u.teardown));
795                 tf->u.teardown.reason_code = cpu_to_le16(status_code);
796                 break;
797         case WLAN_TDLS_DISCOVERY_REQUEST:
798                 tf->category = WLAN_CATEGORY_TDLS;
799                 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
800 
801                 skb_put(skb, sizeof(tf->u.discover_req));
802                 tf->u.discover_req.dialog_token = dialog_token;
803                 break;
804         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
805                 tf->category = WLAN_CATEGORY_TDLS;
806                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
807 
808                 skb_put(skb, sizeof(tf->u.chan_switch_req));
809                 break;
810         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
811                 tf->category = WLAN_CATEGORY_TDLS;
812                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
813 
814                 skb_put(skb, sizeof(tf->u.chan_switch_resp));
815                 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
816                 break;
817         default:
818                 return -EINVAL;
819         }
820 
821         return 0;
822 }
823 
824 static int
825 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
826                            const u8 *peer, u8 action_code, u8 dialog_token,
827                            u16 status_code, struct sk_buff *skb)
828 {
829         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
830         struct ieee80211_mgmt *mgmt;
831 
832         mgmt = (void *)skb_put(skb, 24);
833         memset(mgmt, 0, 24);
834         memcpy(mgmt->da, peer, ETH_ALEN);
835         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
836         memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
837 
838         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
839                                           IEEE80211_STYPE_ACTION);
840 
841         switch (action_code) {
842         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
843                 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
844                 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
845                 mgmt->u.action.u.tdls_discover_resp.action_code =
846                         WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
847                 mgmt->u.action.u.tdls_discover_resp.dialog_token =
848                         dialog_token;
849                 mgmt->u.action.u.tdls_discover_resp.capability =
850                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
851                                                                  status_code));
852                 break;
853         default:
854                 return -EINVAL;
855         }
856 
857         return 0;
858 }
859 
860 static struct sk_buff *
861 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
862                                       const u8 *peer, u8 action_code,
863                                       u8 dialog_token, u16 status_code,
864                                       bool initiator, const u8 *extra_ies,
865                                       size_t extra_ies_len, u8 oper_class,
866                                       struct cfg80211_chan_def *chandef)
867 {
868         struct ieee80211_local *local = sdata->local;
869         struct sk_buff *skb;
870         int ret;
871 
872         skb = netdev_alloc_skb(sdata->dev,
873                                local->hw.extra_tx_headroom +
874                                max(sizeof(struct ieee80211_mgmt),
875                                    sizeof(struct ieee80211_tdls_data)) +
876                                50 + /* supported rates */
877                                10 + /* ext capab */
878                                26 + /* max(WMM-info, WMM-param) */
879                                2 + max(sizeof(struct ieee80211_ht_cap),
880                                        sizeof(struct ieee80211_ht_operation)) +
881                                2 + max(sizeof(struct ieee80211_vht_cap),
882                                        sizeof(struct ieee80211_vht_operation)) +
883                                50 + /* supported channels */
884                                3 + /* 40/20 BSS coex */
885                                4 + /* AID */
886                                4 + /* oper classes */
887                                extra_ies_len +
888                                sizeof(struct ieee80211_tdls_lnkie));
889         if (!skb)
890                 return NULL;
891 
892         skb_reserve(skb, local->hw.extra_tx_headroom);
893 
894         switch (action_code) {
895         case WLAN_TDLS_SETUP_REQUEST:
896         case WLAN_TDLS_SETUP_RESPONSE:
897         case WLAN_TDLS_SETUP_CONFIRM:
898         case WLAN_TDLS_TEARDOWN:
899         case WLAN_TDLS_DISCOVERY_REQUEST:
900         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
901         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
902                 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
903                                                      sdata->dev, peer,
904                                                      action_code, dialog_token,
905                                                      status_code, skb);
906                 break;
907         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
908                 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
909                                                  peer, action_code,
910                                                  dialog_token, status_code,
911                                                  skb);
912                 break;
913         default:
914                 ret = -ENOTSUPP;
915                 break;
916         }
917 
918         if (ret < 0)
919                 goto fail;
920 
921         ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
922                                initiator, extra_ies, extra_ies_len, oper_class,
923                                chandef);
924         return skb;
925 
926 fail:
927         dev_kfree_skb(skb);
928         return NULL;
929 }
930 
931 static int
932 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
933                                 const u8 *peer, u8 action_code, u8 dialog_token,
934                                 u16 status_code, u32 peer_capability,
935                                 bool initiator, const u8 *extra_ies,
936                                 size_t extra_ies_len, u8 oper_class,
937                                 struct cfg80211_chan_def *chandef)
938 {
939         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
940         struct sk_buff *skb = NULL;
941         struct sta_info *sta;
942         u32 flags = 0;
943         int ret = 0;
944 
945         rcu_read_lock();
946         sta = sta_info_get(sdata, peer);
947 
948         /* infer the initiator if we can, to support old userspace */
949         switch (action_code) {
950         case WLAN_TDLS_SETUP_REQUEST:
951                 if (sta) {
952                         set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
953                         sta->sta.tdls_initiator = false;
954                 }
955                 /* fall-through */
956         case WLAN_TDLS_SETUP_CONFIRM:
957         case WLAN_TDLS_DISCOVERY_REQUEST:
958                 initiator = true;
959                 break;
960         case WLAN_TDLS_SETUP_RESPONSE:
961                 /*
962                  * In some testing scenarios, we send a request and response.
963                  * Make the last packet sent take effect for the initiator
964                  * value.
965                  */
966                 if (sta) {
967                         clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
968                         sta->sta.tdls_initiator = true;
969                 }
970                 /* fall-through */
971         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
972                 initiator = false;
973                 break;
974         case WLAN_TDLS_TEARDOWN:
975         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
976         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
977                 /* any value is ok */
978                 break;
979         default:
980                 ret = -ENOTSUPP;
981                 break;
982         }
983 
984         if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
985                 initiator = true;
986 
987         rcu_read_unlock();
988         if (ret < 0)
989                 goto fail;
990 
991         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
992                                                     dialog_token, status_code,
993                                                     initiator, extra_ies,
994                                                     extra_ies_len, oper_class,
995                                                     chandef);
996         if (!skb) {
997                 ret = -EINVAL;
998                 goto fail;
999         }
1000 
1001         if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
1002                 ieee80211_tx_skb(sdata, skb);
1003                 return 0;
1004         }
1005 
1006         /*
1007          * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1008          * we should default to AC_VI.
1009          */
1010         switch (action_code) {
1011         case WLAN_TDLS_SETUP_REQUEST:
1012         case WLAN_TDLS_SETUP_RESPONSE:
1013                 skb_set_queue_mapping(skb, IEEE80211_AC_BK);
1014                 skb->priority = 2;
1015                 break;
1016         default:
1017                 skb_set_queue_mapping(skb, IEEE80211_AC_VI);
1018                 skb->priority = 5;
1019                 break;
1020         }
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 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp