kernel/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         struct ieee80211_local *local = sdata->local;
 171         u16 capab;
 172
 173         /* The capability will be 0 when sending a failure code */
 174         if (status_code != 0)
 175                 return 0;
 176
 177         capab = 0;
 178         if (ieee80211_get_sdata_band(sdata) != IEEE80211_BAND_2GHZ)
 179                 return capab;
 180
 181         if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 182                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 183         if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 184                 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 185
 186         return capab;
 187 }
 188
 189 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
 190                                        struct sk_buff *skb, const u8 *peer,
 191                                        bool initiator)
 192 {
 193         struct ieee80211_tdls_lnkie *lnkid;
 194         const u8 *init_addr, *rsp_addr;
 195
 196         if (initiator) {
 197                 init_addr = sdata->vif.addr;
 198                 rsp_addr = peer;
 199         } else {
 200                 init_addr = peer;
 201                 rsp_addr = sdata->vif.addr;
 202         }
 203
 204         lnkid = (void *)skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
 205
 206         lnkid->ie_type = WLAN_EID_LINK_ID;
 207         lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
 208
 209         memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 210         memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
 211         memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
 212 }
 213
 214 static void
 215 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 216 {
 217         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 218         u8 *pos = (void *)skb_put(skb, 4);
 219
 220         *pos++ = WLAN_EID_AID;
 221         *pos++ = 2; /* len */
 222         put_unaligned_le16(ifmgd->aid, pos);
 223 }
 224
 225 /* translate numbering in the WMM parameter IE to the mac80211 notation */
 226 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
 227 {
 228         switch (ac) {
 229         default:
 230                 WARN_ON_ONCE(1);
 231         case 0:
 232                 return IEEE80211_AC_BE;
 233         case 1:
 234                 return IEEE80211_AC_BK;
 235         case 2:
 236                 return IEEE80211_AC_VI;
 237         case 3:
 238                 return IEEE80211_AC_VO;
 239         }
 240 }
 241
 242 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
 243 {
 244         u8 ret;
 245
 246         ret = aifsn & 0x0f;
 247         if (acm)
 248                 ret |= 0x10;
 249         ret |= (aci << 5) & 0x60;
 250         return ret;
 251 }
 252
 253 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
 254 {
 255         return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
 256                ((ilog2(cw_max + 1) << 0x4) & 0xf0);
 257 }
 258
 259 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
 260                                             struct sk_buff *skb)
 261 {
 262         struct ieee80211_wmm_param_ie *wmm;
 263         struct ieee80211_tx_queue_params *txq;
 264         int i;
 265
 266         wmm = (void *)skb_put(skb, sizeof(*wmm));
 267         memset(wmm, 0, sizeof(*wmm));
 268
 269         wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
 270         wmm->len = sizeof(*wmm) - 2;
 271
 272         wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
 273         wmm->oui[1] = 0x50;
 274         wmm->oui[2] = 0xf2;
 275         wmm->oui_type = 2; /* WME */
 276         wmm->oui_subtype = 1; /* WME param */
 277         wmm->version = 1; /* WME ver */
 278         wmm->qos_info = 0; /* U-APSD not in use */
 279
 280         /*
 281          * Use the EDCA parameters defined for the BSS, or default if the AP
 282          * doesn't support it, as mandated by 802.11-2012 section 10.22.4
 283          */
 284         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 285                 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
 286                 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
 287                                                                txq->acm, i);
 288                 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
 289                 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
 290         }
 291 }
 292
 293 static void
 294 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
 295                                    struct sk_buff *skb, const u8 *peer,
 296                                    u8 action_code, bool initiator,
 297                                    const u8 *extra_ies, size_t extra_ies_len)
 298 {
 299         enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
 300         struct ieee80211_local *local = sdata->local;
 301         struct ieee80211_supported_band *sband;
 302         struct ieee80211_sta_ht_cap ht_cap;
 303         struct ieee80211_sta_vht_cap vht_cap;
 304         struct sta_info *sta = NULL;
 305         size_t offset = 0, noffset;
 306         u8 *pos;
 307
 308         ieee80211_add_srates_ie(sdata, skb, false, band);
 309         ieee80211_add_ext_srates_ie(sdata, skb, false, band);
 310         ieee80211_tdls_add_supp_channels(sdata, skb);
 311
 312         /* add any custom IEs that go before Extended Capabilities */
 313         if (extra_ies_len) {
 314                 static const u8 before_ext_cap[] = {
 315                         WLAN_EID_SUPP_RATES,
 316                         WLAN_EID_COUNTRY,
 317                         WLAN_EID_EXT_SUPP_RATES,
 318                         WLAN_EID_SUPPORTED_CHANNELS,
 319                         WLAN_EID_RSN,
 320                 };
 321                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 322                                              before_ext_cap,
 323                                              ARRAY_SIZE(before_ext_cap),
 324                                              offset);
 325                 pos = skb_put(skb, noffset - offset);
 326                 memcpy(pos, extra_ies + offset, noffset - offset);
 327                 offset = noffset;
 328         }
 329
 330         ieee80211_tdls_add_ext_capab(local, skb);
 331
 332         /* add the QoS element if we support it */
 333         if (local->hw.queues >= IEEE80211_NUM_ACS &&
 334             action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
 335                 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
 336
 337         /* add any custom IEs that go before HT capabilities */
 338         if (extra_ies_len) {
 339                 static const u8 before_ht_cap[] = {
 340                         WLAN_EID_SUPP_RATES,
 341                         WLAN_EID_COUNTRY,
 342                         WLAN_EID_EXT_SUPP_RATES,
 343                         WLAN_EID_SUPPORTED_CHANNELS,
 344                         WLAN_EID_RSN,
 345                         WLAN_EID_EXT_CAPABILITY,
 346                         WLAN_EID_QOS_CAPA,
 347                         WLAN_EID_FAST_BSS_TRANSITION,
 348                         WLAN_EID_TIMEOUT_INTERVAL,
 349                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 350                 };
 351                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 352                                              before_ht_cap,
 353                                              ARRAY_SIZE(before_ht_cap),
 354                                              offset);
 355                 pos = skb_put(skb, noffset - offset);
 356                 memcpy(pos, extra_ies + offset, noffset - offset);
 357                 offset = noffset;
 358         }
 359
 360         rcu_read_lock();
 361
 362         /* we should have the peer STA if we're already responding */
 363         if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
 364                 sta = sta_info_get(sdata, peer);
 365                 if (WARN_ON_ONCE(!sta)) {
 366                         rcu_read_unlock();
 367                         return;
 368                 }
 369         }
 370
 371         ieee80211_tdls_add_oper_classes(sdata, skb);
 372
 373         /*
 374          * with TDLS we can switch channels, and HT-caps are not necessarily
 375          * the same on all bands. The specification limits the setup to a
 376          * single HT-cap, so use the current band for now.
 377          */
 378         sband = local->hw.wiphy->bands[band];
 379         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 380
 381         if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 382              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 383             ht_cap.ht_supported) {
 384                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 385
 386                 /* disable SMPS in TDLS initiator */
 387                 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
 388                                 << IEEE80211_HT_CAP_SM_PS_SHIFT;
 389
 390                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 391                 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 392         } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 393                    ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
 394                 /* disable SMPS in TDLS responder */
 395                 sta->sta.ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
 396                                         << IEEE80211_HT_CAP_SM_PS_SHIFT;
 397
 398                 /* the peer caps are already intersected with our own */
 399                 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
 400
 401                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 402                 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 403         }
 404
 405         if (ht_cap.ht_supported &&
 406             (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
 407                 ieee80211_tdls_add_bss_coex_ie(skb);
 408
 409         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 410
 411         /* add any custom IEs that go before VHT capabilities */
 412         if (extra_ies_len) {
 413                 static const u8 before_vht_cap[] = {
 414                         WLAN_EID_SUPP_RATES,
 415                         WLAN_EID_COUNTRY,
 416                         WLAN_EID_EXT_SUPP_RATES,
 417                         WLAN_EID_SUPPORTED_CHANNELS,
 418                         WLAN_EID_RSN,
 419                         WLAN_EID_EXT_CAPABILITY,
 420                         WLAN_EID_QOS_CAPA,
 421                         WLAN_EID_FAST_BSS_TRANSITION,
 422                         WLAN_EID_TIMEOUT_INTERVAL,
 423                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 424                         WLAN_EID_MULTI_BAND,
 425                 };
 426                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 427                                              before_vht_cap,
 428                                              ARRAY_SIZE(before_vht_cap),
 429                                              offset);
 430                 pos = skb_put(skb, noffset - offset);
 431                 memcpy(pos, extra_ies + offset, noffset - offset);
 432                 offset = noffset;
 433         }
 434
 435         /* build the VHT-cap similarly to the HT-cap */
 436         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 437         if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 438              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 439             vht_cap.vht_supported) {
 440                 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 441
 442                 /* the AID is present only when VHT is implemented */
 443                 if (action_code == WLAN_TDLS_SETUP_REQUEST)
 444                         ieee80211_tdls_add_aid(sdata, skb);
 445
 446                 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 447                 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 448         } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 449                    vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
 450                 /* the peer caps are already intersected with our own */
 451                 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
 452
 453                 /* the AID is present only when VHT is implemented */
 454                 ieee80211_tdls_add_aid(sdata, skb);
 455
 456                 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 457                 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 458         }
 459
 460         rcu_read_unlock();
 461
 462         /* add any remaining IEs */
 463         if (extra_ies_len) {
 464                 noffset = extra_ies_len;
 465                 pos = skb_put(skb, noffset - offset);
 466                 memcpy(pos, extra_ies + offset, noffset - offset);
 467         }
 468
 469 }
 470
 471 static void
 472 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
 473                                  struct sk_buff *skb, const u8 *peer,
 474                                  bool initiator, const u8 *extra_ies,
 475                                  size_t extra_ies_len)
 476 {
 477         struct ieee80211_local *local = sdata->local;
 478         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 479         size_t offset = 0, noffset;
 480         struct sta_info *sta, *ap_sta;
 481         enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
 482         u8 *pos;
 483
 484         rcu_read_lock();
 485
 486         sta = sta_info_get(sdata, peer);
 487         ap_sta = sta_info_get(sdata, ifmgd->bssid);
 488         if (WARN_ON_ONCE(!sta || !ap_sta)) {
 489                 rcu_read_unlock();
 490                 return;
 491         }
 492
 493         /* add any custom IEs that go before the QoS IE */
 494         if (extra_ies_len) {
 495                 static const u8 before_qos[] = {
 496                         WLAN_EID_RSN,
 497                 };
 498                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 499                                              before_qos,
 500                                              ARRAY_SIZE(before_qos),
 501                                              offset);
 502                 pos = skb_put(skb, noffset - offset);
 503                 memcpy(pos, extra_ies + offset, noffset - offset);
 504                 offset = noffset;
 505         }
 506
 507         /* add the QoS param IE if both the peer and we support it */
 508         if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
 509                 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
 510
 511         /* add any custom IEs that go before HT operation */
 512         if (extra_ies_len) {
 513                 static const u8 before_ht_op[] = {
 514                         WLAN_EID_RSN,
 515                         WLAN_EID_QOS_CAPA,
 516                         WLAN_EID_FAST_BSS_TRANSITION,
 517                         WLAN_EID_TIMEOUT_INTERVAL,
 518                 };
 519                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 520                                              before_ht_op,
 521                                              ARRAY_SIZE(before_ht_op),
 522                                              offset);
 523                 pos = skb_put(skb, noffset - offset);
 524                 memcpy(pos, extra_ies + offset, noffset - offset);
 525                 offset = noffset;
 526         }
 527
 528         /* if HT support is only added in TDLS, we need an HT-operation IE */
 529         if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
 530                 struct ieee80211_chanctx_conf *chanctx_conf =
 531                                 rcu_dereference(sdata->vif.chanctx_conf);
 532                 if (!WARN_ON(!chanctx_conf)) {
 533                         pos = skb_put(skb, 2 +
 534                                       sizeof(struct ieee80211_ht_operation));
 535                         /* send an empty HT operation IE */
 536                         ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
 537                                                    &chanctx_conf->def, 0);
 538                 }
 539         }
 540
 541         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 542
 543         /* only include VHT-operation if not on the 2.4GHz band */
 544         if (band != IEEE80211_BAND_2GHZ && !ap_sta->sta.vht_cap.vht_supported &&
 545             sta->sta.vht_cap.vht_supported) {
 546                 struct ieee80211_chanctx_conf *chanctx_conf =
 547                                 rcu_dereference(sdata->vif.chanctx_conf);
 548                 if (!WARN_ON(!chanctx_conf)) {
 549                         pos = skb_put(skb, 2 +
 550                                       sizeof(struct ieee80211_vht_operation));
 551                         ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
 552                                                     &chanctx_conf->def);
 553                 }
 554         }
 555
 556         rcu_read_unlock();
 557
 558         /* add any remaining IEs */
 559         if (extra_ies_len) {
 560                 noffset = extra_ies_len;
 561                 pos = skb_put(skb, noffset - offset);
 562                 memcpy(pos, extra_ies + offset, noffset - offset);
 563         }
 564 }
 565
 566 static void
 567 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
 568                                        struct sk_buff *skb, const u8 *peer,
 569                                        bool initiator, const u8 *extra_ies,
 570                                        size_t extra_ies_len, u8 oper_class,
 571                                        struct cfg80211_chan_def *chandef)
 572 {
 573         struct ieee80211_tdls_data *tf;
 574         size_t offset = 0, noffset;
 575         u8 *pos;
 576
 577         if (WARN_ON_ONCE(!chandef))
 578                 return;
 579
 580         tf = (void *)skb->data;
 581         tf->u.chan_switch_req.target_channel =
 582                 ieee80211_frequency_to_channel(chandef->chan->center_freq);
 583         tf->u.chan_switch_req.oper_class = oper_class;
 584
 585         if (extra_ies_len) {
 586                 static const u8 before_lnkie[] = {
 587                         WLAN_EID_SECONDARY_CHANNEL_OFFSET,
 588                 };
 589                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 590                                              before_lnkie,
 591                                              ARRAY_SIZE(before_lnkie),
 592                                              offset);
 593                 pos = skb_put(skb, noffset - offset);
 594                 memcpy(pos, extra_ies + offset, noffset - offset);
 595                 offset = noffset;
 596         }
 597
 598         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 599
 600         /* add any remaining IEs */
 601         if (extra_ies_len) {
 602                 noffset = extra_ies_len;
 603                 pos = skb_put(skb, noffset - offset);
 604                 memcpy(pos, extra_ies + offset, noffset - offset);
 605         }
 606 }
 607
 608 static void
 609 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
 610                                         struct sk_buff *skb, const u8 *peer,
 611                                         u16 status_code, bool initiator,
 612                                         const u8 *extra_ies,
 613                                         size_t extra_ies_len)
 614 {
 615         if (status_code == 0)
 616                 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 617
 618         if (extra_ies_len)
 619                 memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
 620 }
 621
 622 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
 623                                    struct sk_buff *skb, const u8 *peer,
 624                                    u8 action_code, u16 status_code,
 625                                    bool initiator, const u8 *extra_ies,
 626                                    size_t extra_ies_len, u8 oper_class,
 627                                    struct cfg80211_chan_def *chandef)
 628 {
 629         switch (action_code) {
 630         case WLAN_TDLS_SETUP_REQUEST:
 631         case WLAN_TDLS_SETUP_RESPONSE:
 632         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 633                 if (status_code == 0)
 634                         ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
 635                                                            action_code,
 636                                                            initiator,
 637                                                            extra_ies,
 638                                                            extra_ies_len);
 639                 break;
 640         case WLAN_TDLS_SETUP_CONFIRM:
 641                 if (status_code == 0)
 642                         ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
 643                                                          initiator, extra_ies,
 644                                                          extra_ies_len);
 645                 break;
 646         case WLAN_TDLS_TEARDOWN:
 647         case WLAN_TDLS_DISCOVERY_REQUEST:
 648                 if (extra_ies_len)
 649                         memcpy(skb_put(skb, extra_ies_len), extra_ies,
 650                                extra_ies_len);
 651                 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
 652                         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 653                 break;
 654         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 655                 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
 656                                                        initiator, extra_ies,
 657                                                        extra_ies_len,
 658                                                        oper_class, chandef);
 659                 break;
 660         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 661                 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
 662                                                         status_code,
 663                                                         initiator, extra_ies,
 664                                                         extra_ies_len);
 665                 break;
 666         }
 667
 668 }
 669
 670 static int
 671 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
 672                                const u8 *peer, u8 action_code, u8 dialog_token,
 673                                u16 status_code, struct sk_buff *skb)
 674 {
 675         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 676         struct ieee80211_tdls_data *tf;
 677
 678         tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
 679
 680         memcpy(tf->da, peer, ETH_ALEN);
 681         memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
 682         tf->ether_type = cpu_to_be16(ETH_P_TDLS);
 683         tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
 684
 685         /* network header is after the ethernet header */
 686         skb_set_network_header(skb, ETH_HLEN);
 687
 688         switch (action_code) {
 689         case WLAN_TDLS_SETUP_REQUEST:
 690                 tf->category = WLAN_CATEGORY_TDLS;
 691                 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
 692
 693                 skb_put(skb, sizeof(tf->u.setup_req));
 694                 tf->u.setup_req.dialog_token = dialog_token;
 695                 tf->u.setup_req.capability =
 696                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 697                                                                  status_code));
 698                 break;
 699         case WLAN_TDLS_SETUP_RESPONSE:
 700                 tf->category = WLAN_CATEGORY_TDLS;
 701                 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
 702
 703                 skb_put(skb, sizeof(tf->u.setup_resp));
 704                 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
 705                 tf->u.setup_resp.dialog_token = dialog_token;
 706                 tf->u.setup_resp.capability =
 707                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 708                                                                  status_code));
 709                 break;
 710         case WLAN_TDLS_SETUP_CONFIRM:
 711                 tf->category = WLAN_CATEGORY_TDLS;
 712                 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
 713
 714                 skb_put(skb, sizeof(tf->u.setup_cfm));
 715                 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
 716                 tf->u.setup_cfm.dialog_token = dialog_token;
 717                 break;
 718         case WLAN_TDLS_TEARDOWN:
 719                 tf->category = WLAN_CATEGORY_TDLS;
 720                 tf->action_code = WLAN_TDLS_TEARDOWN;
 721
 722                 skb_put(skb, sizeof(tf->u.teardown));
 723                 tf->u.teardown.reason_code = cpu_to_le16(status_code);
 724                 break;
 725         case WLAN_TDLS_DISCOVERY_REQUEST:
 726                 tf->category = WLAN_CATEGORY_TDLS;
 727                 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
 728
 729                 skb_put(skb, sizeof(tf->u.discover_req));
 730                 tf->u.discover_req.dialog_token = dialog_token;
 731                 break;
 732         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 733                 tf->category = WLAN_CATEGORY_TDLS;
 734                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
 735
 736                 skb_put(skb, sizeof(tf->u.chan_switch_req));
 737                 break;
 738         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 739                 tf->category = WLAN_CATEGORY_TDLS;
 740                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
 741
 742                 skb_put(skb, sizeof(tf->u.chan_switch_resp));
 743                 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
 744                 break;
 745         default:
 746                 return -EINVAL;
 747         }
 748
 749         return 0;
 750 }
 751
 752 static int
 753 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
 754                            const u8 *peer, u8 action_code, u8 dialog_token,
 755                            u16 status_code, struct sk_buff *skb)
 756 {
 757         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 758         struct ieee80211_mgmt *mgmt;
 759
 760         mgmt = (void *)skb_put(skb, 24);
 761         memset(mgmt, 0, 24);
 762         memcpy(mgmt->da, peer, ETH_ALEN);
 763         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 764         memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 765
 766         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 767                                           IEEE80211_STYPE_ACTION);
 768
 769         switch (action_code) {
 770         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 771                 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
 772                 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
 773                 mgmt->u.action.u.tdls_discover_resp.action_code =
 774                         WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
 775                 mgmt->u.action.u.tdls_discover_resp.dialog_token =
 776                         dialog_token;
 777                 mgmt->u.action.u.tdls_discover_resp.capability =
 778                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 779                                                                  status_code));
 780                 break;
 781         default:
 782                 return -EINVAL;
 783         }
 784
 785         return 0;
 786 }
 787
 788 static struct sk_buff *
 789 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
 790                                       const u8 *peer, u8 action_code,
 791                                       u8 dialog_token, u16 status_code,
 792                                       bool initiator, const u8 *extra_ies,
 793                                       size_t extra_ies_len, u8 oper_class,
 794                                       struct cfg80211_chan_def *chandef)
 795 {
 796         struct ieee80211_local *local = sdata->local;
 797         struct sk_buff *skb;
 798         int ret;
 799
 800         skb = netdev_alloc_skb(sdata->dev,
 801                                local->hw.extra_tx_headroom +
 802                                max(sizeof(struct ieee80211_mgmt),
 803                                    sizeof(struct ieee80211_tdls_data)) +
 804                                50 + /* supported rates */
 805                                7 + /* ext capab */
 806                                26 + /* max(WMM-info, WMM-param) */
 807                                2 + max(sizeof(struct ieee80211_ht_cap),
 808                                        sizeof(struct ieee80211_ht_operation)) +
 809                                2 + max(sizeof(struct ieee80211_vht_cap),
 810                                        sizeof(struct ieee80211_vht_operation)) +
 811                                50 + /* supported channels */
 812                                3 + /* 40/20 BSS coex */
 813                                4 + /* AID */
 814                                4 + /* oper classes */
 815                                extra_ies_len +
 816                                sizeof(struct ieee80211_tdls_lnkie));
 817         if (!skb)
 818                 return NULL;
 819
 820         skb_reserve(skb, local->hw.extra_tx_headroom);
 821
 822         switch (action_code) {
 823         case WLAN_TDLS_SETUP_REQUEST:
 824         case WLAN_TDLS_SETUP_RESPONSE:
 825         case WLAN_TDLS_SETUP_CONFIRM:
 826         case WLAN_TDLS_TEARDOWN:
 827         case WLAN_TDLS_DISCOVERY_REQUEST:
 828         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 829         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 830                 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
 831                                                      sdata->dev, peer,
 832                                                      action_code, dialog_token,
 833                                                      status_code, skb);
 834                 break;
 835         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 836                 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
 837                                                  peer, action_code,
 838                                                  dialog_token, status_code,
 839                                                  skb);
 840                 break;
 841         default:
 842                 ret = -ENOTSUPP;
 843                 break;
 844         }
 845
 846         if (ret < 0)
 847                 goto fail;
 848
 849         ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
 850                                initiator, extra_ies, extra_ies_len, oper_class,
 851                                chandef);
 852         return skb;
 853
 854 fail:
 855         dev_kfree_skb(skb);
 856         return NULL;
 857 }
 858
 859 static int
 860 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
 861                                 const u8 *peer, u8 action_code, u8 dialog_token,
 862                                 u16 status_code, u32 peer_capability,
 863                                 bool initiator, const u8 *extra_ies,
 864                                 size_t extra_ies_len, u8 oper_class,
 865                                 struct cfg80211_chan_def *chandef)
 866 {
 867         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 868         struct sk_buff *skb = NULL;
 869         struct sta_info *sta;
 870         u32 flags = 0;
 871         int ret = 0;
 872
 873         rcu_read_lock();
 874         sta = sta_info_get(sdata, peer);
 875
 876         /* infer the initiator if we can, to support old userspace */
 877         switch (action_code) {
 878         case WLAN_TDLS_SETUP_REQUEST:
 879                 if (sta) {
 880                         set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
 881                         sta->sta.tdls_initiator = false;
 882                 }
 883                 /* fall-through */
 884         case WLAN_TDLS_SETUP_CONFIRM:
 885         case WLAN_TDLS_DISCOVERY_REQUEST:
 886                 initiator = true;
 887                 break;
 888         case WLAN_TDLS_SETUP_RESPONSE:
 889                 /*
 890                  * In some testing scenarios, we send a request and response.
 891                  * Make the last packet sent take effect for the initiator
 892                  * value.
 893                  */
 894                 if (sta) {
 895                         clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
 896                         sta->sta.tdls_initiator = true;
 897                 }
 898                 /* fall-through */
 899         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 900                 initiator = false;
 901                 break;
 902         case WLAN_TDLS_TEARDOWN:
 903         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 904         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 905                 /* any value is ok */
 906                 break;
 907         default:
 908                 ret = -ENOTSUPP;
 909                 break;
 910         }
 911
 912         if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
 913                 initiator = true;
 914
 915         rcu_read_unlock();
 916         if (ret < 0)
 917                 goto fail;
 918
 919         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
 920                                                     dialog_token, status_code,
 921                                                     initiator, extra_ies,
 922                                                     extra_ies_len, oper_class,
 923                                                     chandef);
 924         if (!skb) {
 925                 ret = -EINVAL;
 926                 goto fail;
 927         }
 928
 929         if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
 930                 ieee80211_tx_skb(sdata, skb);
 931                 return 0;
 932         }
 933
 934         /*
 935          * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
 936          * we should default to AC_VI.
 937          */
 938         switch (action_code) {
 939         case WLAN_TDLS_SETUP_REQUEST:
 940         case WLAN_TDLS_SETUP_RESPONSE:
 941                 skb_set_queue_mapping(skb, IEEE80211_AC_BK);
 942                 skb->priority = 2;
 943                 break;
 944         default:
 945                 skb_set_queue_mapping(skb, IEEE80211_AC_VI);
 946                 skb->priority = 5;
 947                 break;
 948         }
 949
 950         /*
 951          * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
 952          * Later, if no ACK is returned from peer, we will re-send the teardown
 953          * packet through the AP.
 954          */
 955         if ((action_code == WLAN_TDLS_TEARDOWN) &&
 956             (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
 957                 bool try_resend; /* Should we keep skb for possible resend */
 958
 959                 /* If not sending directly to peer - no point in keeping skb */
 960                 rcu_read_lock();
 961                 sta = sta_info_get(sdata, peer);
 962                 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
 963                 rcu_read_unlock();
 964
 965                 spin_lock_bh(&sdata->u.mgd.teardown_lock);
 966                 if (try_resend && !sdata->u.mgd.teardown_skb) {
 967                         /* Mark it as requiring TX status callback  */
 968                         flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 969                                  IEEE80211_TX_INTFL_MLME_CONN_TX;
 970
 971                         /*
 972                          * skb is copied since mac80211 will later set
 973                          * properties that might not be the same as the AP,
 974                          * such as encryption, QoS, addresses, etc.
 975                          *
 976                          * No problem if skb_copy() fails, so no need to check.
 977                          */
 978                         sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
 979                         sdata->u.mgd.orig_teardown_skb = skb;
 980                 }
 981                 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
 982         }
 983
 984         /* disable bottom halves when entering the Tx path */
 985         local_bh_disable();
 986         __ieee80211_subif_start_xmit(skb, dev, flags);
 987         local_bh_enable();
 988
 989         return ret;
 990
 991 fail:
 992         dev_kfree_skb(skb);
 993         return ret;
 994 }
 995
 996 static int
 997 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
 998                           const u8 *peer, u8 action_code, u8 dialog_token,
 999                           u16 status_code, u32 peer_capability, bool initiator,
1000                           const u8 *extra_ies, size_t extra_ies_len)
1001 {
1002         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1003         struct ieee80211_local *local = sdata->local;
1004         int ret;
1005
1006         mutex_lock(&local->mtx);
1007
1008         /* we don't support concurrent TDLS peer setups */
1009         if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1010             !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1011                 ret = -EBUSY;
1012                 goto out_unlock;
1013         }
1014
1015         /*
1016          * make sure we have a STA representing the peer so we drop or buffer
1017          * non-TDLS-setup frames to the peer. We can't send other packets
1018          * during setup through the AP path.
1019          * Allow error packets to be sent - sometimes we don't even add a STA
1020          * before failing the setup.
1021          */
1022         if (status_code == 0) {
1023                 rcu_read_lock();
1024                 if (!sta_info_get(sdata, peer)) {
1025                         rcu_read_unlock();
1026                         ret = -ENOLINK;
1027                         goto out_unlock;
1028                 }
1029                 rcu_read_unlock();
1030         }
1031
1032         ieee80211_flush_queues(local, sdata, false);
1033         memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1034         mutex_unlock(&local->mtx);
1035
1036         /* we cannot take the mutex while preparing the setup packet */
1037         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1038                                               dialog_token, status_code,
1039                                               peer_capability, initiator,
1040                                               extra_ies, extra_ies_len, 0,
1041                                               NULL);
1042         if (ret < 0) {
1043                 mutex_lock(&local->mtx);
1044                 eth_zero_addr(sdata->u.mgd.tdls_peer);
1045                 mutex_unlock(&local->mtx);
1046                 return ret;
1047         }
1048
1049         ieee80211_queue_delayed_work(&sdata->local->hw,
1050                                      &sdata->u.mgd.tdls_peer_del_work,
1051                                      TDLS_PEER_SETUP_TIMEOUT);
1052         return 0;
1053
1054 out_unlock:
1055         mutex_unlock(&local->mtx);
1056         return ret;
1057 }
1058
1059 static int
1060 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1061                              const u8 *peer, u8 action_code, u8 dialog_token,
1062                              u16 status_code, u32 peer_capability,
1063                              bool initiator, const u8 *extra_ies,
1064                              size_t extra_ies_len)
1065 {
1066         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1067         struct ieee80211_local *local = sdata->local;
1068         struct sta_info *sta;
1069         int ret;
1070
1071         /*
1072          * No packets can be transmitted to the peer via the AP during setup -
1073          * the STA is set as a TDLS peer, but is not authorized.
1074          * During teardown, we prevent direct transmissions by stopping the
1075          * queues and flushing all direct packets.
1076          */
1077         ieee80211_stop_vif_queues(local, sdata,
1078                                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1079         ieee80211_flush_queues(local, sdata, false);
1080
1081         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1082                                               dialog_token, status_code,
1083                                               peer_capability, initiator,
1084                                               extra_ies, extra_ies_len, 0,
1085                                               NULL);
1086         if (ret < 0)
1087                 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1088                           ret);
1089
1090         /*
1091          * Remove the STA AUTH flag to force further traffic through the AP. If
1092          * the STA was unreachable, it was already removed.
1093          */
1094         rcu_read_lock();
1095         sta = sta_info_get(sdata, peer);
1096         if (sta)
1097                 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1098         rcu_read_unlock();
1099
1100         ieee80211_wake_vif_queues(local, sdata,
1101                                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1102
1103         return 0;
1104 }
1105
1106 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1107                         const u8 *peer, u8 action_code, u8 dialog_token,
1108                         u16 status_code, u32 peer_capability,
1109                         bool initiator, const u8 *extra_ies,
1110                         size_t extra_ies_len)
1111 {
1112         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1113         int ret;
1114
1115         if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1116                 return -ENOTSUPP;
1117
1118         /* make sure we are in managed mode, and associated */
1119         if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1120             !sdata->u.mgd.associated)
1121                 return -EINVAL;
1122
1123         switch (action_code) {
1124         case WLAN_TDLS_SETUP_REQUEST:
1125         case WLAN_TDLS_SETUP_RESPONSE:
1126                 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1127                                                 dialog_token, status_code,
1128                                                 peer_capability, initiator,
1129                                                 extra_ies, extra_ies_len);
1130                 break;
1131         case WLAN_TDLS_TEARDOWN:
1132                 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1133                                                    action_code, dialog_token,
1134                                                    status_code,
1135                                                    peer_capability, initiator,
1136                                                    extra_ies, extra_ies_len);
1137                 break;
1138         case WLAN_TDLS_DISCOVERY_REQUEST:
1139                 /*
1140                  * Protect the discovery so we can hear the TDLS discovery
1141                  * response frame. It is transmitted directly and not buffered
1142                  * by the AP.
1143                  */
1144                 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1145                 /* fall-through */
1146         case WLAN_TDLS_SETUP_CONFIRM:
1147         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1148                 /* no special handling */
1149                 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1150                                                       action_code,
1151                                                       dialog_token,
1152                                                       status_code,
1153                                                       peer_capability,
1154                                                       initiator, extra_ies,
1155                                                       extra_ies_len, 0, NULL);
1156                 break;
1157         default:
1158                 ret = -EOPNOTSUPP;
1159                 break;
1160         }
1161
1162         tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1163                  action_code, peer, ret);
1164         return ret;
1165 }
1166
1167 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1168                         const u8 *peer, enum nl80211_tdls_operation oper)
1169 {
1170         struct sta_info *sta;
1171         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1172         struct ieee80211_local *local = sdata->local;
1173         int ret;
1174
1175         if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1176                 return -ENOTSUPP;
1177
1178         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1179                 return -EINVAL;
1180
1181         switch (oper) {
1182         case NL80211_TDLS_ENABLE_LINK:
1183         case NL80211_TDLS_DISABLE_LINK:
1184                 break;
1185         case NL80211_TDLS_TEARDOWN:
1186         case NL80211_TDLS_SETUP:
1187         case NL80211_TDLS_DISCOVERY_REQ:
1188                 /* We don't support in-driver setup/teardown/discovery */
1189                 return -ENOTSUPP;
1190         }
1191
1192         mutex_lock(&local->mtx);
1193         tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1194
1195         switch (oper) {
1196         case NL80211_TDLS_ENABLE_LINK:
1197                 rcu_read_lock();
1198                 sta = sta_info_get(sdata, peer);
1199                 if (!sta) {
1200                         rcu_read_unlock();
1201                         ret = -ENOLINK;
1202                         break;
1203                 }
1204
1205                 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1206                 rcu_read_unlock();
1207
1208                 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1209                              !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1210                 ret = 0;
1211                 break;
1212         case NL80211_TDLS_DISABLE_LINK:
1213                 /*
1214                  * The teardown message in ieee80211_tdls_mgmt_teardown() was
1215                  * created while the queues were stopped, so it might still be
1216                  * pending. Before flushing the queues we need to be sure the
1217                  * message is handled by the tasklet handling pending messages,
1218                  * otherwise we might start destroying the station before
1219                  * sending the teardown packet.
1220                  * Note that this only forces the tasklet to flush pendings -
1221                  * not to stop the tasklet from rescheduling itself.
1222                  */
1223                 tasklet_kill(&local->tx_pending_tasklet);
1224                 /* flush a potentially queued teardown packet */
1225                 ieee80211_flush_queues(local, sdata, false);
1226
1227                 ret = sta_info_destroy_addr(sdata, peer);
1228                 break;
1229         default:
1230                 ret = -ENOTSUPP;
1231                 break;
1232         }
1233
1234         if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1235                 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1236                 eth_zero_addr(sdata->u.mgd.tdls_peer);
1237         }
1238
1239         mutex_unlock(&local->mtx);
1240         return ret;
1241 }
1242
1243 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1244                                  enum nl80211_tdls_operation oper,
1245                                  u16 reason_code, gfp_t gfp)
1246 {
1247         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1248
1249         if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1250                 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1251                           oper);
1252                 return;
1253         }
1254
1255         cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1256 }
1257 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1258
1259 static void
1260 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1261 {
1262         struct ieee80211_ch_switch_timing *ch_sw;
1263
1264         *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1265         *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1266
1267         ch_sw = (void *)buf;
1268         ch_sw->switch_time = cpu_to_le16(switch_time);
1269         ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1270 }
1271
1272 /* find switch timing IE in SKB ready for Tx */
1273 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1274 {
1275         struct ieee80211_tdls_data *tf;
1276         const u8 *ie_start;
1277
1278         /*
1279          * Get the offset for the new location of the switch timing IE.
1280          * The SKB network header will now point to the "payload_type"
1281          * element of the TDLS data frame struct.
1282          */
1283         tf = container_of(skb->data + skb_network_offset(skb),
1284                           struct ieee80211_tdls_data, payload_type);
1285         ie_start = tf->u.chan_switch_req.variable;
1286         return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1287                                 skb->len - (ie_start - skb->data));
1288 }
1289
1290 static struct sk_buff *
1291 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1292                               struct cfg80211_chan_def *chandef,
1293                               u32 *ch_sw_tm_ie_offset)
1294 {
1295         struct ieee80211_sub_if_data *sdata = sta->sdata;
1296         u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1297                      2 + sizeof(struct ieee80211_ch_switch_timing)];
1298         int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1299         u8 *pos = extra_ies;
1300         struct sk_buff *skb;
1301
1302         /*
1303          * if chandef points to a wide channel add a Secondary-Channel
1304          * Offset information element
1305          */
1306         if (chandef->width == NL80211_CHAN_WIDTH_40) {
1307                 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1308                 bool ht40plus;
1309
1310                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1311                 *pos++ = sizeof(*sec_chan_ie);
1312                 sec_chan_ie = (void *)pos;
1313
1314                 ht40plus = cfg80211_get_chandef_type(chandef) ==
1315                                                         NL80211_CHAN_HT40PLUS;
1316                 sec_chan_ie->sec_chan_offs = ht40plus ?
1317                                              IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1318                                              IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1319                 pos += sizeof(*sec_chan_ie);
1320
1321                 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1322         }
1323
1324         /* just set the values to 0, this is a template */
1325         iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1326
1327         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1328                                               WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1329                                               0, 0, !sta->sta.tdls_initiator,
1330                                               extra_ies, extra_ies_len,
1331                                               oper_class, chandef);
1332         if (!skb)
1333                 return NULL;
1334
1335         skb = ieee80211_build_data_template(sdata, skb, 0);
1336         if (IS_ERR(skb)) {
1337                 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1338                 return NULL;
1339         }
1340
1341         if (ch_sw_tm_ie_offset) {
1342                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1343
1344                 if (!tm_ie) {
1345                         tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1346                         dev_kfree_skb_any(skb);
1347                         return NULL;
1348                 }
1349
1350                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1351         }
1352
1353         tdls_dbg(sdata,
1354                  "TDLS channel switch request template for %pM ch %d width %d\n",
1355                  sta->sta.addr, chandef->chan->center_freq, chandef->width);
1356         return skb;
1357 }
1358
1359 int
1360 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1361                               const u8 *addr, u8 oper_class,
1362                               struct cfg80211_chan_def *chandef)
1363 {
1364         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1365         struct ieee80211_local *local = sdata->local;
1366         struct sta_info *sta;
1367         struct sk_buff *skb = NULL;
1368         u32 ch_sw_tm_ie;
1369         int ret;
1370
1371         mutex_lock(&local->sta_mtx);
1372         sta = sta_info_get(sdata, addr);
1373         if (!sta) {
1374                 tdls_dbg(sdata,
1375                          "Invalid TDLS peer %pM for channel switch request\n",
1376                          addr);
1377                 ret = -ENOENT;
1378                 goto out;
1379         }
1380
1381         if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1382                 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1383                          addr);
1384                 ret = -ENOTSUPP;
1385                 goto out;
1386         }
1387
1388         skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1389                                             &ch_sw_tm_ie);
1390         if (!skb) {
1391                 ret = -ENOENT;
1392                 goto out;
1393         }
1394
1395         ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1396                                       chandef, skb, ch_sw_tm_ie);
1397         if (!ret)
1398                 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1399
1400 out:
1401         mutex_unlock(&local->sta_mtx);
1402         dev_kfree_skb_any(skb);
1403         return ret;
1404 }
1405
1406 void
1407 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1408                                      struct net_device *dev,
1409                                      const u8 *addr)
1410 {
1411         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1412         struct ieee80211_local *local = sdata->local;
1413         struct sta_info *sta;
1414
1415         mutex_lock(&local->sta_mtx);
1416         sta = sta_info_get(sdata, addr);
1417         if (!sta) {
1418                 tdls_dbg(sdata,
1419                          "Invalid TDLS peer %pM for channel switch cancel\n",
1420                          addr);
1421                 goto out;
1422         }
1423
1424         if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1425                 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1426                          addr);
1427                 goto out;
1428         }
1429
1430         drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1431         clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1432
1433 out:
1434         mutex_unlock(&local->sta_mtx);
1435 }
1436
1437 static struct sk_buff *
1438 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1439                                    u32 *ch_sw_tm_ie_offset)
1440 {
1441         struct ieee80211_sub_if_data *sdata = sta->sdata;
1442         struct sk_buff *skb;
1443         u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1444
1445         /* initial timing are always zero in the template */
1446         iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1447
1448         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1449                                         WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1450                                         0, 0, !sta->sta.tdls_initiator,
1451                                         extra_ies, sizeof(extra_ies), 0, NULL);
1452         if (!skb)
1453                 return NULL;
1454
1455         skb = ieee80211_build_data_template(sdata, skb, 0);
1456         if (IS_ERR(skb)) {
1457                 tdls_dbg(sdata,
1458                          "Failed building TDLS channel switch resp frame\n");
1459                 return NULL;
1460         }
1461
1462         if (ch_sw_tm_ie_offset) {
1463                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1464
1465                 if (!tm_ie) {
1466                         tdls_dbg(sdata,
1467                                  "No switch timing IE in TDLS switch resp\n");
1468                         dev_kfree_skb_any(skb);
1469                         return NULL;
1470                 }
1471
1472                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1473         }
1474
1475         tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1476                  sta->sta.addr);
1477         return skb;
1478 }
1479
1480 static int
1481 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1482                                            struct sk_buff *skb)
1483 {
1484         struct ieee80211_local *local = sdata->local;
1485         struct ieee802_11_elems elems;
1486         struct sta_info *sta;
1487         struct ieee80211_tdls_data *tf = (void *)skb->data;
1488         bool local_initiator;
1489         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1490         int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1491         struct ieee80211_tdls_ch_sw_params params = {};
1492         int ret;
1493
1494         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1495         params.timestamp = rx_status->device_timestamp;
1496
1497         if (skb->len < baselen) {
1498                 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1499                          skb->len);
1500                 return -EINVAL;
1501         }
1502
1503         mutex_lock(&local->sta_mtx);
1504         sta = sta_info_get(sdata, tf->sa);
1505         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1506                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1507                          tf->sa);
1508                 ret = -EINVAL;
1509                 goto out;
1510         }
1511
1512         params.sta = &sta->sta;
1513         params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1514         if (params.status != 0) {
1515                 ret = 0;
1516                 goto call_drv;
1517         }
1518
1519         ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1520                                skb->len - baselen, false, &elems);
1521         if (elems.parse_error) {
1522                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1523                 ret = -EINVAL;
1524                 goto out;
1525         }
1526
1527         if (!elems.ch_sw_timing || !elems.lnk_id) {
1528                 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1529                 ret = -EINVAL;
1530                 goto out;
1531         }
1532
1533         /* validate the initiator is set correctly */
1534         local_initiator =
1535                 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1536         if (local_initiator == sta->sta.tdls_initiator) {
1537                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1538                 ret = -EINVAL;
1539                 goto out;
1540         }
1541
1542         params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1543         params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1544
1545         params.tmpl_skb =
1546                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1547         if (!params.tmpl_skb) {
1548                 ret = -ENOENT;
1549                 goto out;
1550         }
1551
1552 call_drv:
1553         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1554
1555         tdls_dbg(sdata,
1556                  "TDLS channel switch response received from %pM status %d\n",
1557                  tf->sa, params.status);
1558
1559 out:
1560         mutex_unlock(&local->sta_mtx);
1561         dev_kfree_skb_any(params.tmpl_skb);
1562         return ret;
1563 }
1564
1565 static int
1566 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1567                                           struct sk_buff *skb)
1568 {
1569         struct ieee80211_local *local = sdata->local;
1570         struct ieee802_11_elems elems;
1571         struct cfg80211_chan_def chandef;
1572         struct ieee80211_channel *chan;
1573         enum nl80211_channel_type chan_type;
1574         int freq;
1575         u8 target_channel, oper_class;
1576         bool local_initiator;
1577         struct sta_info *sta;
1578         enum ieee80211_band band;
1579         struct ieee80211_tdls_data *tf = (void *)skb->data;
1580         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1581         int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1582         struct ieee80211_tdls_ch_sw_params params = {};
1583         int ret = 0;
1584
1585         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1586         params.timestamp = rx_status->device_timestamp;
1587
1588         if (skb->len < baselen) {
1589                 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1590                          skb->len);
1591                 return -EINVAL;
1592         }
1593
1594         target_channel = tf->u.chan_switch_req.target_channel;
1595         oper_class = tf->u.chan_switch_req.oper_class;
1596
1597         /*
1598          * We can't easily infer the channel band. The operating class is
1599          * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1600          * solution here is to treat channels with number >14 as 5GHz ones,
1601          * and specifically check for the (oper_class, channel) combinations
1602          * where this doesn't hold. These are thankfully unique according to
1603          * IEEE802.11-2012.
1604          * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1605          * valid here.
1606          */
1607         if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1608              oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1609              target_channel < 14)
1610                 band = IEEE80211_BAND_5GHZ;
1611         else
1612                 band = target_channel < 14 ? IEEE80211_BAND_2GHZ :
1613                                              IEEE80211_BAND_5GHZ;
1614
1615         freq = ieee80211_channel_to_frequency(target_channel, band);
1616         if (freq == 0) {
1617                 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1618                          target_channel);
1619                 return -EINVAL;
1620         }
1621
1622         chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1623         if (!chan) {
1624                 tdls_dbg(sdata,
1625                          "Unsupported channel for TDLS chan switch: %d\n",
1626                          target_channel);
1627                 return -EINVAL;
1628         }
1629
1630         ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1631                                skb->len - baselen, false, &elems);
1632         if (elems.parse_error) {
1633                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1634                 return -EINVAL;
1635         }
1636
1637         if (!elems.ch_sw_timing || !elems.lnk_id) {
1638                 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1639                 return -EINVAL;
1640         }
1641
1642         mutex_lock(&local->sta_mtx);
1643         sta = sta_info_get(sdata, tf->sa);
1644         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1645                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1646                          tf->sa);
1647                 ret = -EINVAL;
1648                 goto out;
1649         }
1650
1651         params.sta = &sta->sta;
1652
1653         /* validate the initiator is set correctly */
1654         local_initiator =
1655                 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1656         if (local_initiator == sta->sta.tdls_initiator) {
1657                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1658                 ret = -EINVAL;
1659                 goto out;
1660         }
1661
1662         if (!sta->sta.ht_cap.ht_supported) {
1663                 chan_type = NL80211_CHAN_NO_HT;
1664         } else if (!elems.sec_chan_offs) {
1665                 chan_type = NL80211_CHAN_HT20;
1666         } else {
1667                 switch (elems.sec_chan_offs->sec_chan_offs) {
1668                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1669                         chan_type = NL80211_CHAN_HT40PLUS;
1670                         break;
1671                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1672                         chan_type = NL80211_CHAN_HT40MINUS;
1673                         break;
1674                 default:
1675                         chan_type = NL80211_CHAN_HT20;
1676                         break;
1677                 }
1678         }
1679
1680         cfg80211_chandef_create(&chandef, chan, chan_type);
1681         params.chandef = &chandef;
1682
1683         params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1684         params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1685
1686         params.tmpl_skb =
1687                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1688                                                    &params.ch_sw_tm_ie);
1689         if (!params.tmpl_skb) {
1690                 ret = -ENOENT;
1691                 goto out;
1692         }
1693
1694         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1695
1696         tdls_dbg(sdata,
1697                  "TDLS ch switch request received from %pM ch %d width %d\n",
1698                  tf->sa, params.chandef->chan->center_freq,
1699                  params.chandef->width);
1700 out:
1701         mutex_unlock(&local->sta_mtx);
1702         dev_kfree_skb_any(params.tmpl_skb);
1703         return ret;
1704 }
1705
1706 void ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1707                                            struct sk_buff *skb)
1708 {
1709         struct ieee80211_tdls_data *tf = (void *)skb->data;
1710         struct wiphy *wiphy = sdata->local->hw.wiphy;
1711
1712         /* make sure the driver supports it */
1713         if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1714                 return;
1715
1716         /* we want to access the entire packet */
1717         if (skb_linearize(skb))
1718                 return;
1719         /*
1720          * The packet/size was already validated by mac80211 Rx path, only look
1721          * at the action type.
1722          */
1723         switch (tf->action_code) {
1724         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1725                 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1726                 break;
1727         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1728                 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1729                 break;
1730         default:
1731                 WARN_ON_ONCE(1);
1732                 return;
1733         }
1734 }