net/mac80211/tdls.c

   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  *
   8  * This file is GPLv2 as found in COPYING.
   9  */
  10
  11 #include <linux/ieee80211.h>
  12 #include <linux/log2.h>
  13 #include <net/cfg80211.h>
  14 #include "ieee80211_i.h"
  15 #include "driver-ops.h"
  16
  17 /* give usermode some time for retries in setting up the TDLS session */
  18 #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ)
  19
  20 void ieee80211_tdls_peer_del_work(struct work_struct *wk)
  21 {
  22         struct ieee80211_sub_if_data *sdata;
  23         struct ieee80211_local *local;
  24
  25         sdata = container_of(wk, struct ieee80211_sub_if_data,
  26                              u.mgd.tdls_peer_del_work.work);
  27         local = sdata->local;
  28
  29         mutex_lock(&local->mtx);
  30         if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
  31                 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
  32                 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
  33                 eth_zero_addr(sdata->u.mgd.tdls_peer);
  34         }
  35         mutex_unlock(&local->mtx);
  36 }
  37
  38 static void ieee80211_tdls_add_ext_capab(struct ieee80211_local *local,
  39                                          struct sk_buff *skb)
  40 {
  41         u8 *pos = (void *)skb_put(skb, 7);
  42         bool chan_switch = local->hw.wiphy->features &
  43                            NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
  44
  45         *pos++ = WLAN_EID_EXT_CAPABILITY;
  46         *pos++ = 5; /* len */
  47         *pos++ = 0x0;
  48         *pos++ = 0x0;
  49         *pos++ = 0x0;
  50         *pos++ = chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0;
  51         *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
  52 }
  53
  54 static u8
  55 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
  56                            struct sk_buff *skb, u16 start, u16 end,
  57                            u16 spacing)
  58 {
  59         u8 subband_cnt = 0, ch_cnt = 0;
  60         struct ieee80211_channel *ch;
  61         struct cfg80211_chan_def chandef;
  62         int i, subband_start;
  63
  64         for (i = start; i <= end; i += spacing) {
  65                 if (!ch_cnt)
  66                         subband_start = i;
  67
  68                 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
  69                 if (ch) {
  70                         /* we will be active on the channel */
  71                         cfg80211_chandef_create(&chandef, ch,
  72                                                 NL80211_CHAN_NO_HT);
  73                         if (cfg80211_reg_can_beacon(sdata->local->hw.wiphy,
  74                                                     &chandef,
  75                                                     sdata->wdev.iftype)) {
  76                                 ch_cnt++;
  77                                 /*
  78                                  * check if the next channel is also part of
  79                                  * this allowed range
  80                                  */
  81                                 continue;
  82                         }
  83                 }
  84
  85                 /*
  86                  * we've reached the end of a range, with allowed channels
  87                  * found
  88                  */
  89                 if (ch_cnt) {
  90                         u8 *pos = skb_put(skb, 2);
  91                         *pos++ = ieee80211_frequency_to_channel(subband_start);
  92                         *pos++ = ch_cnt;
  93
  94                         subband_cnt++;
  95                         ch_cnt = 0;
  96                 }
  97         }
  98
  99         /* all channels in the requested range are allowed - add them here */
 100         if (ch_cnt) {
 101                 u8 *pos = skb_put(skb, 2);
 102                 *pos++ = ieee80211_frequency_to_channel(subband_start);
 103                 *pos++ = ch_cnt;
 104
 105                 subband_cnt++;
 106         }
 107
 108         return subband_cnt;
 109 }
 110
 111 static void
 112 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
 113                                  struct sk_buff *skb)
 114 {
 115         /*
 116          * Add possible channels for TDLS. These are channels that are allowed
 117          * to be active.
 118          */
 119         u8 subband_cnt;
 120         u8 *pos = skb_put(skb, 2);
 121
 122         *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 123
 124         /*
 125          * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
 126          * this doesn't happen in real world scenarios.
 127          */
 128
 129         /* 2GHz, with 5MHz spacing */
 130         subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
 131
 132         /* 5GHz, with 20MHz spacing */
 133         subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
 134
 135         /* length */
 136         *pos = 2 * subband_cnt;
 137 }
 138
 139 static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata,
 140                                             struct sk_buff *skb)
 141 {
 142         u8 *pos;
 143         u8 op_class;
 144
 145         if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef,
 146                                                   &op_class))
 147                 return;
 148
 149         pos = skb_put(skb, 4);
 150         *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
 151         *pos++ = 2; /* len */
 152
 153         *pos++ = op_class;
 154         *pos++ = op_class; /* give current operating class as alternate too */
 155 }
 156
 157 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
 158 {
 159         u8 *pos = (void *)skb_put(skb, 3);
 160
 161         *pos++ = WLAN_EID_BSS_COEX_2040;
 162         *pos++ = 1; /* len */
 163
 164         *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
 165 }
 166
 167 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
 168                                         u16 status_code)
 169 {
 170         /* The capability will be 0 when sending a failure code */
 171         if (status_code != 0)
 172                 return 0;
 173
 174         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_2GHZ) {
 175                 return WLAN_CAPABILITY_SHORT_SLOT_TIME |
 176                        WLAN_CAPABILITY_SHORT_PREAMBLE;
 177         }
 178
 179         return 0;
 180 }
 181
 182 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
 183                                        struct sk_buff *skb, const u8 *peer,
 184                                        bool initiator)
 185 {
 186         struct ieee80211_tdls_lnkie *lnkid;
 187         const u8 *init_addr, *rsp_addr;
 188
 189         if (initiator) {
 190                 init_addr = sdata->vif.addr;
 191                 rsp_addr = peer;
 192         } else {
 193                 init_addr = peer;
 194                 rsp_addr = sdata->vif.addr;
 195         }
 196
 197         lnkid = (void *)skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
 198
 199         lnkid->ie_type = WLAN_EID_LINK_ID;
 200         lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
 201
 202         memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 203         memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
 204         memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
 205 }
 206
 207 static void
 208 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 209 {
 210         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 211         u8 *pos = (void *)skb_put(skb, 4);
 212
 213         *pos++ = WLAN_EID_AID;
 214         *pos++ = 2; /* len */
 215         put_unaligned_le16(ifmgd->aid, pos);
 216 }
 217
 218 /* translate numbering in the WMM parameter IE to the mac80211 notation */
 219 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
 220 {
 221         switch (ac) {
 222         default:
 223                 WARN_ON_ONCE(1);
 224         case 0:
 225                 return IEEE80211_AC_BE;
 226         case 1:
 227                 return IEEE80211_AC_BK;
 228         case 2:
 229                 return IEEE80211_AC_VI;
 230         case 3:
 231                 return IEEE80211_AC_VO;
 232         }
 233 }
 234
 235 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
 236 {
 237         u8 ret;
 238
 239         ret = aifsn & 0x0f;
 240         if (acm)
 241                 ret |= 0x10;
 242         ret |= (aci << 5) & 0x60;
 243         return ret;
 244 }
 245
 246 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
 247 {
 248         return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
 249                ((ilog2(cw_max + 1) << 0x4) & 0xf0);
 250 }
 251
 252 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
 253                                             struct sk_buff *skb)
 254 {
 255         struct ieee80211_wmm_param_ie *wmm;
 256         struct ieee80211_tx_queue_params *txq;
 257         int i;
 258
 259         wmm = (void *)skb_put(skb, sizeof(*wmm));
 260         memset(wmm, 0, sizeof(*wmm));
 261
 262         wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
 263         wmm->len = sizeof(*wmm) - 2;
 264
 265         wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
 266         wmm->oui[1] = 0x50;
 267         wmm->oui[2] = 0xf2;
 268         wmm->oui_type = 2; /* WME */
 269         wmm->oui_subtype = 1; /* WME param */
 270         wmm->version = 1; /* WME ver */
 271         wmm->qos_info = 0; /* U-APSD not in use */
 272
 273         /*
 274          * Use the EDCA parameters defined for the BSS, or default if the AP
 275          * doesn't support it, as mandated by 802.11-2012 section 10.22.4
 276          */
 277         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 278                 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
 279                 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
 280                                                                txq->acm, i);
 281                 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
 282                 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
 283         }
 284 }
 285
 286 static void
 287 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
 288                                    struct sk_buff *skb, const u8 *peer,
 289                                    u8 action_code, bool initiator,
 290                                    const u8 *extra_ies, size_t extra_ies_len)
 291 {
 292         enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
 293         struct ieee80211_local *local = sdata->local;
 294         struct ieee80211_supported_band *sband;
 295         struct ieee80211_sta_ht_cap ht_cap;
 296         struct ieee80211_sta_vht_cap vht_cap;
 297         struct sta_info *sta = NULL;
 298         size_t offset = 0, noffset;
 299         u8 *pos;
 300
 301         ieee80211_add_srates_ie(sdata, skb, false, band);
 302         ieee80211_add_ext_srates_ie(sdata, skb, false, band);
 303         ieee80211_tdls_add_supp_channels(sdata, skb);
 304
 305         /* add any custom IEs that go before Extended Capabilities */
 306         if (extra_ies_len) {
 307                 static const u8 before_ext_cap[] = {
 308                         WLAN_EID_SUPP_RATES,
 309                         WLAN_EID_COUNTRY,
 310                         WLAN_EID_EXT_SUPP_RATES,
 311                         WLAN_EID_SUPPORTED_CHANNELS,
 312                         WLAN_EID_RSN,
 313                 };
 314                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 315                                              before_ext_cap,
 316                                              ARRAY_SIZE(before_ext_cap),
 317                                              offset);
 318                 pos = skb_put(skb, noffset - offset);
 319                 memcpy(pos, extra_ies + offset, noffset - offset);
 320                 offset = noffset;
 321         }
 322
 323         ieee80211_tdls_add_ext_capab(local, skb);
 324
 325         /* add the QoS element if we support it */
 326         if (local->hw.queues >= IEEE80211_NUM_ACS &&
 327             action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
 328                 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
 329
 330         /* add any custom IEs that go before HT capabilities */
 331         if (extra_ies_len) {
 332                 static const u8 before_ht_cap[] = {
 333                         WLAN_EID_SUPP_RATES,
 334                         WLAN_EID_COUNTRY,
 335                         WLAN_EID_EXT_SUPP_RATES,
 336                         WLAN_EID_SUPPORTED_CHANNELS,
 337                         WLAN_EID_RSN,
 338                         WLAN_EID_EXT_CAPABILITY,
 339                         WLAN_EID_QOS_CAPA,
 340                         WLAN_EID_FAST_BSS_TRANSITION,
 341                         WLAN_EID_TIMEOUT_INTERVAL,
 342                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 343                 };
 344                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 345                                              before_ht_cap,
 346                                              ARRAY_SIZE(before_ht_cap),
 347                                              offset);
 348                 pos = skb_put(skb, noffset - offset);
 349                 memcpy(pos, extra_ies + offset, noffset - offset);
 350                 offset = noffset;
 351         }
 352
 353         rcu_read_lock();
 354
 355         /* we should have the peer STA if we're already responding */
 356         if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
 357                 sta = sta_info_get(sdata, peer);
 358                 if (WARN_ON_ONCE(!sta)) {
 359                         rcu_read_unlock();
 360                         return;
 361                 }
 362         }
 363
 364         ieee80211_tdls_add_oper_classes(sdata, skb);
 365
 366         /*
 367          * with TDLS we can switch channels, and HT-caps are not necessarily
 368          * the same on all bands. The specification limits the setup to a
 369          * single HT-cap, so use the current band for now.
 370          */
 371         sband = local->hw.wiphy->bands[band];
 372         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 373
 374         if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 375              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 376             ht_cap.ht_supported) {
 377                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 378
 379                 /* disable SMPS in TDLS initiator */
 380                 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
 381                                 << IEEE80211_HT_CAP_SM_PS_SHIFT;
 382
 383                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 384                 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 385         } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 386                    ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
 387                 /* disable SMPS in TDLS responder */
 388                 sta->sta.ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
 389                                         << IEEE80211_HT_CAP_SM_PS_SHIFT;
 390
 391                 /* the peer caps are already intersected with our own */
 392                 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
 393
 394                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 395                 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 396         }
 397
 398         if (ht_cap.ht_supported &&
 399             (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
 400                 ieee80211_tdls_add_bss_coex_ie(skb);
 401
 402         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 403
 404         /* add any custom IEs that go before VHT capabilities */
 405         if (extra_ies_len) {
 406                 static const u8 before_vht_cap[] = {
 407                         WLAN_EID_SUPP_RATES,
 408                         WLAN_EID_COUNTRY,
 409                         WLAN_EID_EXT_SUPP_RATES,
 410                         WLAN_EID_SUPPORTED_CHANNELS,
 411                         WLAN_EID_RSN,
 412                         WLAN_EID_EXT_CAPABILITY,
 413                         WLAN_EID_QOS_CAPA,
 414                         WLAN_EID_FAST_BSS_TRANSITION,
 415                         WLAN_EID_TIMEOUT_INTERVAL,
 416                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 417                         WLAN_EID_MULTI_BAND,
 418                 };
 419                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 420                                              before_vht_cap,
 421                                              ARRAY_SIZE(before_vht_cap),
 422                                              offset);
 423                 pos = skb_put(skb, noffset - offset);
 424                 memcpy(pos, extra_ies + offset, noffset - offset);
 425                 offset = noffset;
 426         }
 427
 428         /* build the VHT-cap similarly to the HT-cap */
 429         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 430         if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 431              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 432             vht_cap.vht_supported) {
 433                 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 434
 435                 /* the AID is present only when VHT is implemented */
 436                 if (action_code == WLAN_TDLS_SETUP_REQUEST)
 437                         ieee80211_tdls_add_aid(sdata, skb);
 438
 439                 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 440                 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 441         } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 442                    vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
 443                 /* the peer caps are already intersected with our own */
 444                 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
 445
 446                 /* the AID is present only when VHT is implemented */
 447                 ieee80211_tdls_add_aid(sdata, skb);
 448
 449                 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 450                 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 451         }
 452
 453         rcu_read_unlock();
 454
 455         /* add any remaining IEs */
 456         if (extra_ies_len) {
 457                 noffset = extra_ies_len;
 458                 pos = skb_put(skb, noffset - offset);
 459                 memcpy(pos, extra_ies + offset, noffset - offset);
 460         }
 461
 462 }
 463
 464 static void
 465 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
 466                                  struct sk_buff *skb, const u8 *peer,
 467                                  bool initiator, const u8 *extra_ies,
 468                                  size_t extra_ies_len)
 469 {
 470         struct ieee80211_local *local = sdata->local;
 471         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 472         size_t offset = 0, noffset;
 473         struct sta_info *sta, *ap_sta;
 474         enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
 475         u8 *pos;
 476
 477         rcu_read_lock();
 478
 479         sta = sta_info_get(sdata, peer);
 480         ap_sta = sta_info_get(sdata, ifmgd->bssid);
 481         if (WARN_ON_ONCE(!sta || !ap_sta)) {
 482                 rcu_read_unlock();
 483                 return;
 484         }
 485
 486         /* add any custom IEs that go before the QoS IE */
 487         if (extra_ies_len) {
 488                 static const u8 before_qos[] = {
 489                         WLAN_EID_RSN,
 490                 };
 491                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 492                                              before_qos,
 493                                              ARRAY_SIZE(before_qos),
 494                                              offset);
 495                 pos = skb_put(skb, noffset - offset);
 496                 memcpy(pos, extra_ies + offset, noffset - offset);
 497                 offset = noffset;
 498         }
 499
 500         /* add the QoS param IE if both the peer and we support it */
 501         if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
 502                 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
 503
 504         /* add any custom IEs that go before HT operation */
 505         if (extra_ies_len) {
 506                 static const u8 before_ht_op[] = {
 507                         WLAN_EID_RSN,
 508                         WLAN_EID_QOS_CAPA,
 509                         WLAN_EID_FAST_BSS_TRANSITION,
 510                         WLAN_EID_TIMEOUT_INTERVAL,
 511                 };
 512                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 513                                              before_ht_op,
 514                                              ARRAY_SIZE(before_ht_op),
 515                                              offset);
 516                 pos = skb_put(skb, noffset - offset);
 517                 memcpy(pos, extra_ies + offset, noffset - offset);
 518                 offset = noffset;
 519         }
 520
 521         /* if HT support is only added in TDLS, we need an HT-operation IE */
 522         if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
 523                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 524                 /* send an empty HT operation IE */
 525                 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
 526                                            &sdata->vif.bss_conf.chandef, 0);
 527         }
 528
 529         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 530
 531         /* only include VHT-operation if not on the 2.4GHz band */
 532         if (band != IEEE80211_BAND_2GHZ && sta->sta.vht_cap.vht_supported) {
 533                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 534                 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
 535                                             &sdata->vif.bss_conf.chandef);
 536         }
 537
 538         rcu_read_unlock();
 539
 540         /* add any remaining IEs */
 541         if (extra_ies_len) {
 542                 noffset = extra_ies_len;
 543                 pos = skb_put(skb, noffset - offset);
 544                 memcpy(pos, extra_ies + offset, noffset - offset);
 545         }
 546 }
 547
 548 static void
 549 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
 550                                        struct sk_buff *skb, const u8 *peer,
 551                                        bool initiator, const u8 *extra_ies,
 552                                        size_t extra_ies_len, u8 oper_class,
 553                                        struct cfg80211_chan_def *chandef)
 554 {
 555         struct ieee80211_tdls_data *tf;
 556         size_t offset = 0, noffset;
 557         u8 *pos;
 558
 559         if (WARN_ON_ONCE(!chandef))
 560                 return;
 561
 562         tf = (void *)skb->data;
 563         tf->u.chan_switch_req.target_channel =
 564                 ieee80211_frequency_to_channel(chandef->chan->center_freq);
 565         tf->u.chan_switch_req.oper_class = oper_class;
 566
 567         if (extra_ies_len) {
 568                 static const u8 before_lnkie[] = {
 569                         WLAN_EID_SECONDARY_CHANNEL_OFFSET,
 570                 };
 571                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 572                                              before_lnkie,
 573                                              ARRAY_SIZE(before_lnkie),
 574                                              offset);
 575                 pos = skb_put(skb, noffset - offset);
 576                 memcpy(pos, extra_ies + offset, noffset - offset);
 577                 offset = noffset;
 578         }
 579
 580         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 581
 582         /* add any remaining IEs */
 583         if (extra_ies_len) {
 584                 noffset = extra_ies_len;
 585                 pos = skb_put(skb, noffset - offset);
 586                 memcpy(pos, extra_ies + offset, noffset - offset);
 587         }
 588 }
 589
 590 static void
 591 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
 592                                         struct sk_buff *skb, const u8 *peer,
 593                                         u16 status_code, bool initiator,
 594                                         const u8 *extra_ies,
 595                                         size_t extra_ies_len)
 596 {
 597         if (status_code == 0)
 598                 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 599
 600         if (extra_ies_len)
 601                 memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
 602 }
 603
 604 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
 605                                    struct sk_buff *skb, const u8 *peer,
 606                                    u8 action_code, u16 status_code,
 607                                    bool initiator, const u8 *extra_ies,
 608                                    size_t extra_ies_len, u8 oper_class,
 609                                    struct cfg80211_chan_def *chandef)
 610 {
 611         switch (action_code) {
 612         case WLAN_TDLS_SETUP_REQUEST:
 613         case WLAN_TDLS_SETUP_RESPONSE:
 614         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 615                 if (status_code == 0)
 616                         ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
 617                                                            action_code,
 618                                                            initiator,
 619                                                            extra_ies,
 620                                                            extra_ies_len);
 621                 break;
 622         case WLAN_TDLS_SETUP_CONFIRM:
 623                 if (status_code == 0)
 624                         ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
 625                                                          initiator, extra_ies,
 626                                                          extra_ies_len);
 627                 break;
 628         case WLAN_TDLS_TEARDOWN:
 629         case WLAN_TDLS_DISCOVERY_REQUEST:
 630                 if (extra_ies_len)
 631                         memcpy(skb_put(skb, extra_ies_len), extra_ies,
 632                                extra_ies_len);
 633                 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
 634                         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 635                 break;
 636         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 637                 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
 638                                                        initiator, extra_ies,
 639                                                        extra_ies_len,
 640                                                        oper_class, chandef);
 641                 break;
 642         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 643                 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
 644                                                         status_code,
 645                                                         initiator, extra_ies,
 646                                                         extra_ies_len);
 647                 break;
 648         }
 649
 650 }
 651
 652 static int
 653 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
 654                                const u8 *peer, u8 action_code, u8 dialog_token,
 655                                u16 status_code, struct sk_buff *skb)
 656 {
 657         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 658         struct ieee80211_tdls_data *tf;
 659
 660         tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
 661
 662         memcpy(tf->da, peer, ETH_ALEN);
 663         memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
 664         tf->ether_type = cpu_to_be16(ETH_P_TDLS);
 665         tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
 666
 667         /* network header is after the ethernet header */
 668         skb_set_network_header(skb, ETH_HLEN);
 669
 670         switch (action_code) {
 671         case WLAN_TDLS_SETUP_REQUEST:
 672                 tf->category = WLAN_CATEGORY_TDLS;
 673                 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
 674
 675                 skb_put(skb, sizeof(tf->u.setup_req));
 676                 tf->u.setup_req.dialog_token = dialog_token;
 677                 tf->u.setup_req.capability =
 678                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 679                                                                  status_code));
 680                 break;
 681         case WLAN_TDLS_SETUP_RESPONSE:
 682                 tf->category = WLAN_CATEGORY_TDLS;
 683                 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
 684
 685                 skb_put(skb, sizeof(tf->u.setup_resp));
 686                 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
 687                 tf->u.setup_resp.dialog_token = dialog_token;
 688                 tf->u.setup_resp.capability =
 689                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 690                                                                  status_code));
 691                 break;
 692         case WLAN_TDLS_SETUP_CONFIRM:
 693                 tf->category = WLAN_CATEGORY_TDLS;
 694                 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
 695
 696                 skb_put(skb, sizeof(tf->u.setup_cfm));
 697                 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
 698                 tf->u.setup_cfm.dialog_token = dialog_token;
 699                 break;
 700         case WLAN_TDLS_TEARDOWN:
 701                 tf->category = WLAN_CATEGORY_TDLS;
 702                 tf->action_code = WLAN_TDLS_TEARDOWN;
 703
 704                 skb_put(skb, sizeof(tf->u.teardown));
 705                 tf->u.teardown.reason_code = cpu_to_le16(status_code);
 706                 break;
 707         case WLAN_TDLS_DISCOVERY_REQUEST:
 708                 tf->category = WLAN_CATEGORY_TDLS;
 709                 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
 710
 711                 skb_put(skb, sizeof(tf->u.discover_req));
 712                 tf->u.discover_req.dialog_token = dialog_token;
 713                 break;
 714         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 715                 tf->category = WLAN_CATEGORY_TDLS;
 716                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
 717
 718                 skb_put(skb, sizeof(tf->u.chan_switch_req));
 719                 break;
 720         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 721                 tf->category = WLAN_CATEGORY_TDLS;
 722                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
 723
 724                 skb_put(skb, sizeof(tf->u.chan_switch_resp));
 725                 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
 726                 break;
 727         default:
 728                 return -EINVAL;
 729         }
 730
 731         return 0;
 732 }
 733
 734 static int
 735 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
 736                            const u8 *peer, u8 action_code, u8 dialog_token,
 737                            u16 status_code, struct sk_buff *skb)
 738 {
 739         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 740         struct ieee80211_mgmt *mgmt;
 741
 742         mgmt = (void *)skb_put(skb, 24);
 743         memset(mgmt, 0, 24);
 744         memcpy(mgmt->da, peer, ETH_ALEN);
 745         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 746         memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 747
 748         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 749                                           IEEE80211_STYPE_ACTION);
 750
 751         switch (action_code) {
 752         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 753                 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
 754                 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
 755                 mgmt->u.action.u.tdls_discover_resp.action_code =
 756                         WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
 757                 mgmt->u.action.u.tdls_discover_resp.dialog_token =
 758                         dialog_token;
 759                 mgmt->u.action.u.tdls_discover_resp.capability =
 760                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 761                                                                  status_code));
 762                 break;
 763         default:
 764                 return -EINVAL;
 765         }
 766
 767         return 0;
 768 }
 769
 770 static struct sk_buff *
 771 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
 772                                       const u8 *peer, u8 action_code,
 773                                       u8 dialog_token, u16 status_code,
 774                                       bool initiator, const u8 *extra_ies,
 775                                       size_t extra_ies_len, u8 oper_class,
 776                                       struct cfg80211_chan_def *chandef)
 777 {
 778         struct ieee80211_local *local = sdata->local;
 779         struct sk_buff *skb;
 780         int ret;
 781
 782         skb = netdev_alloc_skb(sdata->dev,
 783                                local->hw.extra_tx_headroom +
 784                                max(sizeof(struct ieee80211_mgmt),
 785                                    sizeof(struct ieee80211_tdls_data)) +
 786                                50 + /* supported rates */
 787                                7 + /* ext capab */
 788                                26 + /* max(WMM-info, WMM-param) */
 789                                2 + max(sizeof(struct ieee80211_ht_cap),
 790                                        sizeof(struct ieee80211_ht_operation)) +
 791                                2 + max(sizeof(struct ieee80211_vht_cap),
 792                                        sizeof(struct ieee80211_vht_operation)) +
 793                                50 + /* supported channels */
 794                                3 + /* 40/20 BSS coex */
 795                                4 + /* AID */
 796                                4 + /* oper classes */
 797                                extra_ies_len +
 798                                sizeof(struct ieee80211_tdls_lnkie));
 799         if (!skb)
 800                 return NULL;
 801
 802         skb_reserve(skb, local->hw.extra_tx_headroom);
 803
 804         switch (action_code) {
 805         case WLAN_TDLS_SETUP_REQUEST:
 806         case WLAN_TDLS_SETUP_RESPONSE:
 807         case WLAN_TDLS_SETUP_CONFIRM:
 808         case WLAN_TDLS_TEARDOWN:
 809         case WLAN_TDLS_DISCOVERY_REQUEST:
 810         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 811         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 812                 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
 813                                                      sdata->dev, peer,
 814                                                      action_code, dialog_token,
 815                                                      status_code, skb);
 816                 break;
 817         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 818                 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
 819                                                  peer, action_code,
 820                                                  dialog_token, status_code,
 821                                                  skb);
 822                 break;
 823         default:
 824                 ret = -ENOTSUPP;
 825                 break;
 826         }
 827
 828         if (ret < 0)
 829                 goto fail;
 830
 831         ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
 832                                initiator, extra_ies, extra_ies_len, oper_class,
 833                                chandef);
 834         return skb;
 835
 836 fail:
 837         dev_kfree_skb(skb);
 838         return NULL;
 839 }
 840
 841 static int
 842 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
 843                                 const u8 *peer, u8 action_code, u8 dialog_token,
 844                                 u16 status_code, u32 peer_capability,
 845                                 bool initiator, const u8 *extra_ies,
 846                                 size_t extra_ies_len, u8 oper_class,
 847                                 struct cfg80211_chan_def *chandef)
 848 {
 849         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 850         struct sk_buff *skb = NULL;
 851         struct sta_info *sta;
 852         u32 flags = 0;
 853         int ret = 0;
 854
 855         rcu_read_lock();
 856         sta = sta_info_get(sdata, peer);
 857
 858         /* infer the initiator if we can, to support old userspace */
 859         switch (action_code) {
 860         case WLAN_TDLS_SETUP_REQUEST:
 861                 if (sta) {
 862                         set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
 863                         sta->sta.tdls_initiator = false;
 864                 }
 865                 /* fall-through */
 866         case WLAN_TDLS_SETUP_CONFIRM:
 867         case WLAN_TDLS_DISCOVERY_REQUEST:
 868                 initiator = true;
 869                 break;
 870         case WLAN_TDLS_SETUP_RESPONSE:
 871                 /*
 872                  * In some testing scenarios, we send a request and response.
 873                  * Make the last packet sent take effect for the initiator
 874                  * value.
 875                  */
 876                 if (sta) {
 877                         clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
 878                         sta->sta.tdls_initiator = true;
 879                 }
 880                 /* fall-through */
 881         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 882                 initiator = false;
 883                 break;
 884         case WLAN_TDLS_TEARDOWN:
 885         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 886         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 887                 /* any value is ok */
 888                 break;
 889         default:
 890                 ret = -ENOTSUPP;
 891                 break;
 892         }
 893
 894         if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
 895                 initiator = true;
 896
 897         rcu_read_unlock();
 898         if (ret < 0)
 899                 goto fail;
 900
 901         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
 902                                                     dialog_token, status_code,
 903                                                     initiator, extra_ies,
 904                                                     extra_ies_len, oper_class,
 905                                                     chandef);
 906         if (!skb) {
 907                 ret = -EINVAL;
 908                 goto fail;
 909         }
 910
 911         if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
 912                 ieee80211_tx_skb(sdata, skb);
 913                 return 0;
 914         }
 915
 916         /*
 917          * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
 918          * we should default to AC_VI.
 919          */
 920         switch (action_code) {
 921         case WLAN_TDLS_SETUP_REQUEST:
 922         case WLAN_TDLS_SETUP_RESPONSE:
 923                 skb_set_queue_mapping(skb, IEEE80211_AC_BK);
 924                 skb->priority = 2;
 925                 break;
 926         default:
 927                 skb_set_queue_mapping(skb, IEEE80211_AC_VI);
 928                 skb->priority = 5;
 929                 break;
 930         }
 931
 932         /*
 933          * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
 934          * Later, if no ACK is returned from peer, we will re-send the teardown
 935          * packet through the AP.
 936          */
 937         if ((action_code == WLAN_TDLS_TEARDOWN) &&
 938             ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
 939                 bool try_resend; /* Should we keep skb for possible resend */
 940
 941                 /* If not sending directly to peer - no point in keeping skb */
 942                 rcu_read_lock();
 943                 sta = sta_info_get(sdata, peer);
 944                 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
 945                 rcu_read_unlock();
 946
 947                 spin_lock_bh(&sdata->u.mgd.teardown_lock);
 948                 if (try_resend && !sdata->u.mgd.teardown_skb) {
 949                         /* Mark it as requiring TX status callback  */
 950                         flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 951                                  IEEE80211_TX_INTFL_MLME_CONN_TX;
 952
 953                         /*
 954                          * skb is copied since mac80211 will later set
 955                          * properties that might not be the same as the AP,
 956                          * such as encryption, QoS, addresses, etc.
 957                          *
 958                          * No problem if skb_copy() fails, so no need to check.
 959                          */
 960                         sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
 961                         sdata->u.mgd.orig_teardown_skb = skb;
 962                 }
 963                 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
 964         }
 965
 966         /* disable bottom halves when entering the Tx path */
 967         local_bh_disable();
 968         __ieee80211_subif_start_xmit(skb, dev, flags);
 969         local_bh_enable();
 970
 971         return ret;
 972
 973 fail:
 974         dev_kfree_skb(skb);
 975         return ret;
 976 }
 977
 978 static int
 979 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
 980                           const u8 *peer, u8 action_code, u8 dialog_token,
 981                           u16 status_code, u32 peer_capability, bool initiator,
 982                           const u8 *extra_ies, size_t extra_ies_len)
 983 {
 984         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 985         struct ieee80211_local *local = sdata->local;
 986         int ret;
 987
 988         mutex_lock(&local->mtx);
 989
 990         /* we don't support concurrent TDLS peer setups */
 991         if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
 992             !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
 993                 ret = -EBUSY;
 994                 goto out_unlock;
 995         }
 996
 997         /*
 998          * make sure we have a STA representing the peer so we drop or buffer
 999          * non-TDLS-setup frames to the peer. We can't send other packets
1000          * during setup through the AP path.
1001          * Allow error packets to be sent - sometimes we don't even add a STA
1002          * before failing the setup.
1003          */
1004         if (status_code == 0) {
1005                 rcu_read_lock();
1006                 if (!sta_info_get(sdata, peer)) {
1007                         rcu_read_unlock();
1008                         ret = -ENOLINK;
1009                         goto out_unlock;
1010                 }
1011                 rcu_read_unlock();
1012         }
1013
1014         ieee80211_flush_queues(local, sdata, false);
1015         memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1016         mutex_unlock(&local->mtx);
1017
1018         /* we cannot take the mutex while preparing the setup packet */
1019         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1020                                               dialog_token, status_code,
1021                                               peer_capability, initiator,
1022                                               extra_ies, extra_ies_len, 0,
1023                                               NULL);
1024         if (ret < 0) {
1025                 mutex_lock(&local->mtx);
1026                 eth_zero_addr(sdata->u.mgd.tdls_peer);
1027                 mutex_unlock(&local->mtx);
1028                 return ret;
1029         }
1030
1031         ieee80211_queue_delayed_work(&sdata->local->hw,
1032                                      &sdata->u.mgd.tdls_peer_del_work,
1033                                      TDLS_PEER_SETUP_TIMEOUT);
1034         return 0;
1035
1036 out_unlock:
1037         mutex_unlock(&local->mtx);
1038         return ret;
1039 }
1040
1041 static int
1042 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1043                              const u8 *peer, u8 action_code, u8 dialog_token,
1044                              u16 status_code, u32 peer_capability,
1045                              bool initiator, const u8 *extra_ies,
1046                              size_t extra_ies_len)
1047 {
1048         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1049         struct ieee80211_local *local = sdata->local;
1050         struct sta_info *sta;
1051         int ret;
1052
1053         /*
1054          * No packets can be transmitted to the peer via the AP during setup -
1055          * the STA is set as a TDLS peer, but is not authorized.
1056          * During teardown, we prevent direct transmissions by stopping the
1057          * queues and flushing all direct packets.
1058          */
1059         ieee80211_stop_vif_queues(local, sdata,
1060                                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1061         ieee80211_flush_queues(local, sdata, false);
1062
1063         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1064                                               dialog_token, status_code,
1065                                               peer_capability, initiator,
1066                                               extra_ies, extra_ies_len, 0,
1067                                               NULL);
1068         if (ret < 0)
1069                 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1070                           ret);
1071
1072         /*
1073          * Remove the STA AUTH flag to force further traffic through the AP. If
1074          * the STA was unreachable, it was already removed.
1075          */
1076         rcu_read_lock();
1077         sta = sta_info_get(sdata, peer);
1078         if (sta)
1079                 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1080         rcu_read_unlock();
1081
1082         ieee80211_wake_vif_queues(local, sdata,
1083                                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1084
1085         return 0;
1086 }
1087
1088 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1089                         const u8 *peer, u8 action_code, u8 dialog_token,
1090                         u16 status_code, u32 peer_capability,
1091                         bool initiator, const u8 *extra_ies,
1092                         size_t extra_ies_len)
1093 {
1094         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1095         int ret;
1096
1097         if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1098                 return -ENOTSUPP;
1099
1100         /* make sure we are in managed mode, and associated */
1101         if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1102             !sdata->u.mgd.associated)
1103                 return -EINVAL;
1104
1105         switch (action_code) {
1106         case WLAN_TDLS_SETUP_REQUEST:
1107         case WLAN_TDLS_SETUP_RESPONSE:
1108                 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1109                                                 dialog_token, status_code,
1110                                                 peer_capability, initiator,
1111                                                 extra_ies, extra_ies_len);
1112                 break;
1113         case WLAN_TDLS_TEARDOWN:
1114                 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1115                                                    action_code, dialog_token,
1116                                                    status_code,
1117                                                    peer_capability, initiator,
1118                                                    extra_ies, extra_ies_len);
1119                 break;
1120         case WLAN_TDLS_DISCOVERY_REQUEST:
1121                 /*
1122                  * Protect the discovery so we can hear the TDLS discovery
1123                  * response frame. It is transmitted directly and not buffered
1124                  * by the AP.
1125                  */
1126                 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1127                 /* fall-through */
1128         case WLAN_TDLS_SETUP_CONFIRM:
1129         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1130                 /* no special handling */
1131                 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1132                                                       action_code,
1133                                                       dialog_token,
1134                                                       status_code,
1135                                                       peer_capability,
1136                                                       initiator, extra_ies,
1137                                                       extra_ies_len, 0, NULL);
1138                 break;
1139         default:
1140                 ret = -EOPNOTSUPP;
1141                 break;
1142         }
1143
1144         tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1145                  action_code, peer, ret);
1146         return ret;
1147 }
1148
1149 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1150                         const u8 *peer, enum nl80211_tdls_operation oper)
1151 {
1152         struct sta_info *sta;
1153         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1154         struct ieee80211_local *local = sdata->local;
1155         int ret;
1156
1157         if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1158                 return -ENOTSUPP;
1159
1160         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1161                 return -EINVAL;
1162
1163         switch (oper) {
1164         case NL80211_TDLS_ENABLE_LINK:
1165         case NL80211_TDLS_DISABLE_LINK:
1166                 break;
1167         case NL80211_TDLS_TEARDOWN:
1168         case NL80211_TDLS_SETUP:
1169         case NL80211_TDLS_DISCOVERY_REQ:
1170                 /* We don't support in-driver setup/teardown/discovery */
1171                 return -ENOTSUPP;
1172         }
1173
1174         mutex_lock(&local->mtx);
1175         tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1176
1177         switch (oper) {
1178         case NL80211_TDLS_ENABLE_LINK:
1179                 if (sdata->vif.csa_active) {
1180                         tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1181                         ret = -EBUSY;
1182                         break;
1183                 }
1184
1185                 rcu_read_lock();
1186                 sta = sta_info_get(sdata, peer);
1187                 if (!sta) {
1188                         rcu_read_unlock();
1189                         ret = -ENOLINK;
1190                         break;
1191                 }
1192
1193                 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1194                 rcu_read_unlock();
1195
1196                 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1197                              !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1198                 ret = 0;
1199                 break;
1200         case NL80211_TDLS_DISABLE_LINK:
1201                 /*
1202                  * The teardown message in ieee80211_tdls_mgmt_teardown() was
1203                  * created while the queues were stopped, so it might still be
1204                  * pending. Before flushing the queues we need to be sure the
1205                  * message is handled by the tasklet handling pending messages,
1206                  * otherwise we might start destroying the station before
1207                  * sending the teardown packet.
1208                  * Note that this only forces the tasklet to flush pendings -
1209                  * not to stop the tasklet from rescheduling itself.
1210                  */
1211                 tasklet_kill(&local->tx_pending_tasklet);
1212                 /* flush a potentially queued teardown packet */
1213                 ieee80211_flush_queues(local, sdata, false);
1214
1215                 ret = sta_info_destroy_addr(sdata, peer);
1216                 break;
1217         default:
1218                 ret = -ENOTSUPP;
1219                 break;
1220         }
1221
1222         if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1223                 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1224                 eth_zero_addr(sdata->u.mgd.tdls_peer);
1225         }
1226
1227         mutex_unlock(&local->mtx);
1228         return ret;
1229 }
1230
1231 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1232                                  enum nl80211_tdls_operation oper,
1233                                  u16 reason_code, gfp_t gfp)
1234 {
1235         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1236
1237         if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1238                 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1239                           oper);
1240                 return;
1241         }
1242
1243         cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1244 }
1245 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1246
1247 static void
1248 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1249 {
1250         struct ieee80211_ch_switch_timing *ch_sw;
1251
1252         *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1253         *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1254
1255         ch_sw = (void *)buf;
1256         ch_sw->switch_time = cpu_to_le16(switch_time);
1257         ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1258 }
1259
1260 /* find switch timing IE in SKB ready for Tx */
1261 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1262 {
1263         struct ieee80211_tdls_data *tf;
1264         const u8 *ie_start;
1265
1266         /*
1267          * Get the offset for the new location of the switch timing IE.
1268          * The SKB network header will now point to the "payload_type"
1269          * element of the TDLS data frame struct.
1270          */
1271         tf = container_of(skb->data + skb_network_offset(skb),
1272                           struct ieee80211_tdls_data, payload_type);
1273         ie_start = tf->u.chan_switch_req.variable;
1274         return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1275                                 skb->len - (ie_start - skb->data));
1276 }
1277
1278 static struct sk_buff *
1279 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1280                               struct cfg80211_chan_def *chandef,
1281                               u32 *ch_sw_tm_ie_offset)
1282 {
1283         struct ieee80211_sub_if_data *sdata = sta->sdata;
1284         u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1285                      2 + sizeof(struct ieee80211_ch_switch_timing)];
1286         int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1287         u8 *pos = extra_ies;
1288         struct sk_buff *skb;
1289
1290         /*
1291          * if chandef points to a wide channel add a Secondary-Channel
1292          * Offset information element
1293          */
1294         if (chandef->width == NL80211_CHAN_WIDTH_40) {
1295                 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1296                 bool ht40plus;
1297
1298                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1299                 *pos++ = sizeof(*sec_chan_ie);
1300                 sec_chan_ie = (void *)pos;
1301
1302                 ht40plus = cfg80211_get_chandef_type(chandef) ==
1303                                                         NL80211_CHAN_HT40PLUS;
1304                 sec_chan_ie->sec_chan_offs = ht40plus ?
1305                                              IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1306                                              IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1307                 pos += sizeof(*sec_chan_ie);
1308
1309                 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1310         }
1311
1312         /* just set the values to 0, this is a template */
1313         iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1314
1315         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1316                                               WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1317                                               0, 0, !sta->sta.tdls_initiator,
1318                                               extra_ies, extra_ies_len,
1319                                               oper_class, chandef);
1320         if (!skb)
1321                 return NULL;
1322
1323         skb = ieee80211_build_data_template(sdata, skb, 0);
1324         if (IS_ERR(skb)) {
1325                 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1326                 return NULL;
1327         }
1328
1329         if (ch_sw_tm_ie_offset) {
1330                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1331
1332                 if (!tm_ie) {
1333                         tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1334                         dev_kfree_skb_any(skb);
1335                         return NULL;
1336                 }
1337
1338                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1339         }
1340
1341         tdls_dbg(sdata,
1342                  "TDLS channel switch request template for %pM ch %d width %d\n",
1343                  sta->sta.addr, chandef->chan->center_freq, chandef->width);
1344         return skb;
1345 }
1346
1347 int
1348 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1349                               const u8 *addr, u8 oper_class,
1350                               struct cfg80211_chan_def *chandef)
1351 {
1352         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1353         struct ieee80211_local *local = sdata->local;
1354         struct sta_info *sta;
1355         struct sk_buff *skb = NULL;
1356         u32 ch_sw_tm_ie;
1357         int ret;
1358
1359         mutex_lock(&local->sta_mtx);
1360         sta = sta_info_get(sdata, addr);
1361         if (!sta) {
1362                 tdls_dbg(sdata,
1363                          "Invalid TDLS peer %pM for channel switch request\n",
1364                          addr);
1365                 ret = -ENOENT;
1366                 goto out;
1367         }
1368
1369         if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1370                 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1371                          addr);
1372                 ret = -ENOTSUPP;
1373                 goto out;
1374         }
1375
1376         skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1377                                             &ch_sw_tm_ie);
1378         if (!skb) {
1379                 ret = -ENOENT;
1380                 goto out;
1381         }
1382
1383         ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1384                                       chandef, skb, ch_sw_tm_ie);
1385         if (!ret)
1386                 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1387
1388 out:
1389         mutex_unlock(&local->sta_mtx);
1390         dev_kfree_skb_any(skb);
1391         return ret;
1392 }
1393
1394 void
1395 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1396                                      struct net_device *dev,
1397                                      const u8 *addr)
1398 {
1399         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1400         struct ieee80211_local *local = sdata->local;
1401         struct sta_info *sta;
1402
1403         mutex_lock(&local->sta_mtx);
1404         sta = sta_info_get(sdata, addr);
1405         if (!sta) {
1406                 tdls_dbg(sdata,
1407                          "Invalid TDLS peer %pM for channel switch cancel\n",
1408                          addr);
1409                 goto out;
1410         }
1411
1412         if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1413                 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1414                          addr);
1415                 goto out;
1416         }
1417
1418         drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1419         clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1420
1421 out:
1422         mutex_unlock(&local->sta_mtx);
1423 }
1424
1425 static struct sk_buff *
1426 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1427                                    u32 *ch_sw_tm_ie_offset)
1428 {
1429         struct ieee80211_sub_if_data *sdata = sta->sdata;
1430         struct sk_buff *skb;
1431         u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1432
1433         /* initial timing are always zero in the template */
1434         iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1435
1436         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1437                                         WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1438                                         0, 0, !sta->sta.tdls_initiator,
1439                                         extra_ies, sizeof(extra_ies), 0, NULL);
1440         if (!skb)
1441                 return NULL;
1442
1443         skb = ieee80211_build_data_template(sdata, skb, 0);
1444         if (IS_ERR(skb)) {
1445                 tdls_dbg(sdata,
1446                          "Failed building TDLS channel switch resp frame\n");
1447                 return NULL;
1448         }
1449
1450         if (ch_sw_tm_ie_offset) {
1451                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1452
1453                 if (!tm_ie) {
1454                         tdls_dbg(sdata,
1455                                  "No switch timing IE in TDLS switch resp\n");
1456                         dev_kfree_skb_any(skb);
1457                         return NULL;
1458                 }
1459
1460                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1461         }
1462
1463         tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1464                  sta->sta.addr);
1465         return skb;
1466 }
1467
1468 static int
1469 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1470                                            struct sk_buff *skb)
1471 {
1472         struct ieee80211_local *local = sdata->local;
1473         struct ieee802_11_elems elems;
1474         struct sta_info *sta;
1475         struct ieee80211_tdls_data *tf = (void *)skb->data;
1476         bool local_initiator;
1477         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1478         int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1479         struct ieee80211_tdls_ch_sw_params params = {};
1480         int ret;
1481
1482         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1483         params.timestamp = rx_status->device_timestamp;
1484
1485         if (skb->len < baselen) {
1486                 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1487                          skb->len);
1488                 return -EINVAL;
1489         }
1490
1491         mutex_lock(&local->sta_mtx);
1492         sta = sta_info_get(sdata, tf->sa);
1493         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1494                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1495                          tf->sa);
1496                 ret = -EINVAL;
1497                 goto out;
1498         }
1499
1500         params.sta = &sta->sta;
1501         params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1502         if (params.status != 0) {
1503                 ret = 0;
1504                 goto call_drv;
1505         }
1506
1507         ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1508                                skb->len - baselen, false, &elems);
1509         if (elems.parse_error) {
1510                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1511                 ret = -EINVAL;
1512                 goto out;
1513         }
1514
1515         if (!elems.ch_sw_timing || !elems.lnk_id) {
1516                 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1517                 ret = -EINVAL;
1518                 goto out;
1519         }
1520
1521         /* validate the initiator is set correctly */
1522         local_initiator =
1523                 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1524         if (local_initiator == sta->sta.tdls_initiator) {
1525                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1526                 ret = -EINVAL;
1527                 goto out;
1528         }
1529
1530         params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1531         params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1532
1533         params.tmpl_skb =
1534                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1535         if (!params.tmpl_skb) {
1536                 ret = -ENOENT;
1537                 goto out;
1538         }
1539
1540 call_drv:
1541         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1542
1543         tdls_dbg(sdata,
1544                  "TDLS channel switch response received from %pM status %d\n",
1545                  tf->sa, params.status);
1546
1547 out:
1548         mutex_unlock(&local->sta_mtx);
1549         dev_kfree_skb_any(params.tmpl_skb);
1550         return ret;
1551 }
1552
1553 static int
1554 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1555                                           struct sk_buff *skb)
1556 {
1557         struct ieee80211_local *local = sdata->local;
1558         struct ieee802_11_elems elems;
1559         struct cfg80211_chan_def chandef;
1560         struct ieee80211_channel *chan;
1561         enum nl80211_channel_type chan_type;
1562         int freq;
1563         u8 target_channel, oper_class;
1564         bool local_initiator;
1565         struct sta_info *sta;
1566         enum ieee80211_band band;
1567         struct ieee80211_tdls_data *tf = (void *)skb->data;
1568         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1569         int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1570         struct ieee80211_tdls_ch_sw_params params = {};
1571         int ret = 0;
1572
1573         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1574         params.timestamp = rx_status->device_timestamp;
1575
1576         if (skb->len < baselen) {
1577                 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1578                          skb->len);
1579                 return -EINVAL;
1580         }
1581
1582         target_channel = tf->u.chan_switch_req.target_channel;
1583         oper_class = tf->u.chan_switch_req.oper_class;
1584
1585         /*
1586          * We can't easily infer the channel band. The operating class is
1587          * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1588          * solution here is to treat channels with number >14 as 5GHz ones,
1589          * and specifically check for the (oper_class, channel) combinations
1590          * where this doesn't hold. These are thankfully unique according to
1591          * IEEE802.11-2012.
1592          * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1593          * valid here.
1594          */
1595         if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1596              oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1597              target_channel < 14)
1598                 band = IEEE80211_BAND_5GHZ;
1599         else
1600                 band = target_channel < 14 ? IEEE80211_BAND_2GHZ :
1601                                              IEEE80211_BAND_5GHZ;
1602
1603         freq = ieee80211_channel_to_frequency(target_channel, band);
1604         if (freq == 0) {
1605                 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1606                          target_channel);
1607                 return -EINVAL;
1608         }
1609
1610         chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1611         if (!chan) {
1612                 tdls_dbg(sdata,
1613                          "Unsupported channel for TDLS chan switch: %d\n",
1614                          target_channel);
1615                 return -EINVAL;
1616         }
1617
1618         ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1619                                skb->len - baselen, false, &elems);
1620         if (elems.parse_error) {
1621                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1622                 return -EINVAL;
1623         }
1624
1625         if (!elems.ch_sw_timing || !elems.lnk_id) {
1626                 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1627                 return -EINVAL;
1628         }
1629
1630         mutex_lock(&local->sta_mtx);
1631         sta = sta_info_get(sdata, tf->sa);
1632         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1633                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1634                          tf->sa);
1635                 ret = -EINVAL;
1636                 goto out;
1637         }
1638
1639         params.sta = &sta->sta;
1640
1641         /* validate the initiator is set correctly */
1642         local_initiator =
1643                 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1644         if (local_initiator == sta->sta.tdls_initiator) {
1645                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1646                 ret = -EINVAL;
1647                 goto out;
1648         }
1649
1650         if (!sta->sta.ht_cap.ht_supported) {
1651                 chan_type = NL80211_CHAN_NO_HT;
1652         } else if (!elems.sec_chan_offs) {
1653                 chan_type = NL80211_CHAN_HT20;
1654         } else {
1655                 switch (elems.sec_chan_offs->sec_chan_offs) {
1656                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1657                         chan_type = NL80211_CHAN_HT40PLUS;
1658                         break;
1659                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1660                         chan_type = NL80211_CHAN_HT40MINUS;
1661                         break;
1662                 default:
1663                         chan_type = NL80211_CHAN_HT20;
1664                         break;
1665                 }
1666         }
1667
1668         cfg80211_chandef_create(&chandef, chan, chan_type);
1669         params.chandef = &chandef;
1670
1671         params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1672         params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1673
1674         params.tmpl_skb =
1675                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1676                                                    &params.ch_sw_tm_ie);
1677         if (!params.tmpl_skb) {
1678                 ret = -ENOENT;
1679                 goto out;
1680         }
1681
1682         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1683
1684         tdls_dbg(sdata,
1685                  "TDLS ch switch request received from %pM ch %d width %d\n",
1686                  tf->sa, params.chandef->chan->center_freq,
1687                  params.chandef->width);
1688 out:
1689         mutex_unlock(&local->sta_mtx);
1690         dev_kfree_skb_any(params.tmpl_skb);
1691         return ret;
1692 }
1693
1694 void ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1695                                            struct sk_buff *skb)
1696 {
1697         struct ieee80211_tdls_data *tf = (void *)skb->data;
1698         struct wiphy *wiphy = sdata->local->hw.wiphy;
1699
1700         /* make sure the driver supports it */
1701         if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1702                 return;
1703
1704         /* we want to access the entire packet */
1705         if (skb_linearize(skb))
1706                 return;
1707         /*
1708          * The packet/size was already validated by mac80211 Rx path, only look
1709          * at the action type.
1710          */
1711         switch (tf->action_code) {
1712         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1713                 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1714                 break;
1715         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1716                 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1717                 break;
1718         default:
1719                 WARN_ON_ONCE(1);
1720                 return;
1721         }
1722 }