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                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 531                 /* send an empty HT operation IE */
 532                 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
 533                                            &sdata->vif.bss_conf.chandef, 0);
 534         }
 535
 536         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 537
 538         /* only include VHT-operation if not on the 2.4GHz band */
 539         if (band != IEEE80211_BAND_2GHZ && sta->sta.vht_cap.vht_supported) {
 540                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 541                 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
 542                                             &sdata->vif.bss_conf.chandef);
 543         }
 544
 545         rcu_read_unlock();
 546
 547         /* add any remaining IEs */
 548         if (extra_ies_len) {
 549                 noffset = extra_ies_len;
 550                 pos = skb_put(skb, noffset - offset);
 551                 memcpy(pos, extra_ies + offset, noffset - offset);
 552         }
 553 }
 554
 555 static void
 556 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
 557                                        struct sk_buff *skb, const u8 *peer,
 558                                        bool initiator, const u8 *extra_ies,
 559                                        size_t extra_ies_len, u8 oper_class,
 560                                        struct cfg80211_chan_def *chandef)
 561 {
 562         struct ieee80211_tdls_data *tf;
 563         size_t offset = 0, noffset;
 564         u8 *pos;
 565
 566         if (WARN_ON_ONCE(!chandef))
 567                 return;
 568
 569         tf = (void *)skb->data;
 570         tf->u.chan_switch_req.target_channel =
 571                 ieee80211_frequency_to_channel(chandef->chan->center_freq);
 572         tf->u.chan_switch_req.oper_class = oper_class;
 573
 574         if (extra_ies_len) {
 575                 static const u8 before_lnkie[] = {
 576                         WLAN_EID_SECONDARY_CHANNEL_OFFSET,
 577                 };
 578                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 579                                              before_lnkie,
 580                                              ARRAY_SIZE(before_lnkie),
 581                                              offset);
 582                 pos = skb_put(skb, noffset - offset);
 583                 memcpy(pos, extra_ies + offset, noffset - offset);
 584                 offset = noffset;
 585         }
 586
 587         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 588
 589         /* add any remaining IEs */
 590         if (extra_ies_len) {
 591                 noffset = extra_ies_len;
 592                 pos = skb_put(skb, noffset - offset);
 593                 memcpy(pos, extra_ies + offset, noffset - offset);
 594         }
 595 }
 596
 597 static void
 598 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
 599                                         struct sk_buff *skb, const u8 *peer,
 600                                         u16 status_code, bool initiator,
 601                                         const u8 *extra_ies,
 602                                         size_t extra_ies_len)
 603 {
 604         if (status_code == 0)
 605                 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 606
 607         if (extra_ies_len)
 608                 memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
 609 }
 610
 611 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
 612                                    struct sk_buff *skb, const u8 *peer,
 613                                    u8 action_code, u16 status_code,
 614                                    bool initiator, const u8 *extra_ies,
 615                                    size_t extra_ies_len, u8 oper_class,
 616                                    struct cfg80211_chan_def *chandef)
 617 {
 618         switch (action_code) {
 619         case WLAN_TDLS_SETUP_REQUEST:
 620         case WLAN_TDLS_SETUP_RESPONSE:
 621         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 622                 if (status_code == 0)
 623                         ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
 624                                                            action_code,
 625                                                            initiator,
 626                                                            extra_ies,
 627                                                            extra_ies_len);
 628                 break;
 629         case WLAN_TDLS_SETUP_CONFIRM:
 630                 if (status_code == 0)
 631                         ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
 632                                                          initiator, extra_ies,
 633                                                          extra_ies_len);
 634                 break;
 635         case WLAN_TDLS_TEARDOWN:
 636         case WLAN_TDLS_DISCOVERY_REQUEST:
 637                 if (extra_ies_len)
 638                         memcpy(skb_put(skb, extra_ies_len), extra_ies,
 639                                extra_ies_len);
 640                 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
 641                         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 642                 break;
 643         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 644                 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
 645                                                        initiator, extra_ies,
 646                                                        extra_ies_len,
 647                                                        oper_class, chandef);
 648                 break;
 649         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 650                 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
 651                                                         status_code,
 652                                                         initiator, extra_ies,
 653                                                         extra_ies_len);
 654                 break;
 655         }
 656
 657 }
 658
 659 static int
 660 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
 661                                const u8 *peer, u8 action_code, u8 dialog_token,
 662                                u16 status_code, struct sk_buff *skb)
 663 {
 664         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 665         struct ieee80211_tdls_data *tf;
 666
 667         tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
 668
 669         memcpy(tf->da, peer, ETH_ALEN);
 670         memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
 671         tf->ether_type = cpu_to_be16(ETH_P_TDLS);
 672         tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
 673
 674         /* network header is after the ethernet header */
 675         skb_set_network_header(skb, ETH_HLEN);
 676
 677         switch (action_code) {
 678         case WLAN_TDLS_SETUP_REQUEST:
 679                 tf->category = WLAN_CATEGORY_TDLS;
 680                 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
 681
 682                 skb_put(skb, sizeof(tf->u.setup_req));
 683                 tf->u.setup_req.dialog_token = dialog_token;
 684                 tf->u.setup_req.capability =
 685                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 686                                                                  status_code));
 687                 break;
 688         case WLAN_TDLS_SETUP_RESPONSE:
 689                 tf->category = WLAN_CATEGORY_TDLS;
 690                 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
 691
 692                 skb_put(skb, sizeof(tf->u.setup_resp));
 693                 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
 694                 tf->u.setup_resp.dialog_token = dialog_token;
 695                 tf->u.setup_resp.capability =
 696                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 697                                                                  status_code));
 698                 break;
 699         case WLAN_TDLS_SETUP_CONFIRM:
 700                 tf->category = WLAN_CATEGORY_TDLS;
 701                 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
 702
 703                 skb_put(skb, sizeof(tf->u.setup_cfm));
 704                 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
 705                 tf->u.setup_cfm.dialog_token = dialog_token;
 706                 break;
 707         case WLAN_TDLS_TEARDOWN:
 708                 tf->category = WLAN_CATEGORY_TDLS;
 709                 tf->action_code = WLAN_TDLS_TEARDOWN;
 710
 711                 skb_put(skb, sizeof(tf->u.teardown));
 712                 tf->u.teardown.reason_code = cpu_to_le16(status_code);
 713                 break;
 714         case WLAN_TDLS_DISCOVERY_REQUEST:
 715                 tf->category = WLAN_CATEGORY_TDLS;
 716                 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
 717
 718                 skb_put(skb, sizeof(tf->u.discover_req));
 719                 tf->u.discover_req.dialog_token = dialog_token;
 720                 break;
 721         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 722                 tf->category = WLAN_CATEGORY_TDLS;
 723                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
 724
 725                 skb_put(skb, sizeof(tf->u.chan_switch_req));
 726                 break;
 727         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 728                 tf->category = WLAN_CATEGORY_TDLS;
 729                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
 730
 731                 skb_put(skb, sizeof(tf->u.chan_switch_resp));
 732                 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
 733                 break;
 734         default:
 735                 return -EINVAL;
 736         }
 737
 738         return 0;
 739 }
 740
 741 static int
 742 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
 743                            const u8 *peer, u8 action_code, u8 dialog_token,
 744                            u16 status_code, struct sk_buff *skb)
 745 {
 746         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 747         struct ieee80211_mgmt *mgmt;
 748
 749         mgmt = (void *)skb_put(skb, 24);
 750         memset(mgmt, 0, 24);
 751         memcpy(mgmt->da, peer, ETH_ALEN);
 752         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 753         memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 754
 755         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 756                                           IEEE80211_STYPE_ACTION);
 757
 758         switch (action_code) {
 759         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 760                 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
 761                 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
 762                 mgmt->u.action.u.tdls_discover_resp.action_code =
 763                         WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
 764                 mgmt->u.action.u.tdls_discover_resp.dialog_token =
 765                         dialog_token;
 766                 mgmt->u.action.u.tdls_discover_resp.capability =
 767                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 768                                                                  status_code));
 769                 break;
 770         default:
 771                 return -EINVAL;
 772         }
 773
 774         return 0;
 775 }
 776
 777 static struct sk_buff *
 778 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
 779                                       const u8 *peer, u8 action_code,
 780                                       u8 dialog_token, u16 status_code,
 781                                       bool initiator, const u8 *extra_ies,
 782                                       size_t extra_ies_len, u8 oper_class,
 783                                       struct cfg80211_chan_def *chandef)
 784 {
 785         struct ieee80211_local *local = sdata->local;
 786         struct sk_buff *skb;
 787         int ret;
 788
 789         skb = netdev_alloc_skb(sdata->dev,
 790                                local->hw.extra_tx_headroom +
 791                                max(sizeof(struct ieee80211_mgmt),
 792                                    sizeof(struct ieee80211_tdls_data)) +
 793                                50 + /* supported rates */
 794                                7 + /* ext capab */
 795                                26 + /* max(WMM-info, WMM-param) */
 796                                2 + max(sizeof(struct ieee80211_ht_cap),
 797                                        sizeof(struct ieee80211_ht_operation)) +
 798                                2 + max(sizeof(struct ieee80211_vht_cap),
 799                                        sizeof(struct ieee80211_vht_operation)) +
 800                                50 + /* supported channels */
 801                                3 + /* 40/20 BSS coex */
 802                                4 + /* AID */
 803                                4 + /* oper classes */
 804                                extra_ies_len +
 805                                sizeof(struct ieee80211_tdls_lnkie));
 806         if (!skb)
 807                 return NULL;
 808
 809         skb_reserve(skb, local->hw.extra_tx_headroom);
 810
 811         switch (action_code) {
 812         case WLAN_TDLS_SETUP_REQUEST:
 813         case WLAN_TDLS_SETUP_RESPONSE:
 814         case WLAN_TDLS_SETUP_CONFIRM:
 815         case WLAN_TDLS_TEARDOWN:
 816         case WLAN_TDLS_DISCOVERY_REQUEST:
 817         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 818         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 819                 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
 820                                                      sdata->dev, peer,
 821                                                      action_code, dialog_token,
 822                                                      status_code, skb);
 823                 break;
 824         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 825                 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
 826                                                  peer, action_code,
 827                                                  dialog_token, status_code,
 828                                                  skb);
 829                 break;
 830         default:
 831                 ret = -ENOTSUPP;
 832                 break;
 833         }
 834
 835         if (ret < 0)
 836                 goto fail;
 837
 838         ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
 839                                initiator, extra_ies, extra_ies_len, oper_class,
 840                                chandef);
 841         return skb;
 842
 843 fail:
 844         dev_kfree_skb(skb);
 845         return NULL;
 846 }
 847
 848 static int
 849 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
 850                                 const u8 *peer, u8 action_code, u8 dialog_token,
 851                                 u16 status_code, u32 peer_capability,
 852                                 bool initiator, const u8 *extra_ies,
 853                                 size_t extra_ies_len, u8 oper_class,
 854                                 struct cfg80211_chan_def *chandef)
 855 {
 856         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 857         struct sk_buff *skb = NULL;
 858         struct sta_info *sta;
 859         u32 flags = 0;
 860         int ret = 0;
 861
 862         rcu_read_lock();
 863         sta = sta_info_get(sdata, peer);
 864
 865         /* infer the initiator if we can, to support old userspace */
 866         switch (action_code) {
 867         case WLAN_TDLS_SETUP_REQUEST:
 868                 if (sta) {
 869                         set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
 870                         sta->sta.tdls_initiator = false;
 871                 }
 872                 /* fall-through */
 873         case WLAN_TDLS_SETUP_CONFIRM:
 874         case WLAN_TDLS_DISCOVERY_REQUEST:
 875                 initiator = true;
 876                 break;
 877         case WLAN_TDLS_SETUP_RESPONSE:
 878                 /*
 879                  * In some testing scenarios, we send a request and response.
 880                  * Make the last packet sent take effect for the initiator
 881                  * value.
 882                  */
 883                 if (sta) {
 884                         clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
 885                         sta->sta.tdls_initiator = true;
 886                 }
 887                 /* fall-through */
 888         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 889                 initiator = false;
 890                 break;
 891         case WLAN_TDLS_TEARDOWN:
 892         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 893         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 894                 /* any value is ok */
 895                 break;
 896         default:
 897                 ret = -ENOTSUPP;
 898                 break;
 899         }
 900
 901         if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
 902                 initiator = true;
 903
 904         rcu_read_unlock();
 905         if (ret < 0)
 906                 goto fail;
 907
 908         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
 909                                                     dialog_token, status_code,
 910                                                     initiator, extra_ies,
 911                                                     extra_ies_len, oper_class,
 912                                                     chandef);
 913         if (!skb) {
 914                 ret = -EINVAL;
 915                 goto fail;
 916         }
 917
 918         if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
 919                 ieee80211_tx_skb(sdata, skb);
 920                 return 0;
 921         }
 922
 923         /*
 924          * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
 925          * we should default to AC_VI.
 926          */
 927         switch (action_code) {
 928         case WLAN_TDLS_SETUP_REQUEST:
 929         case WLAN_TDLS_SETUP_RESPONSE:
 930                 skb_set_queue_mapping(skb, IEEE80211_AC_BK);
 931                 skb->priority = 2;
 932                 break;
 933         default:
 934                 skb_set_queue_mapping(skb, IEEE80211_AC_VI);
 935                 skb->priority = 5;
 936                 break;
 937         }
 938
 939         /*
 940          * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
 941          * Later, if no ACK is returned from peer, we will re-send the teardown
 942          * packet through the AP.
 943          */
 944         if ((action_code == WLAN_TDLS_TEARDOWN) &&
 945             (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
 946                 bool try_resend; /* Should we keep skb for possible resend */
 947
 948                 /* If not sending directly to peer - no point in keeping skb */
 949                 rcu_read_lock();
 950                 sta = sta_info_get(sdata, peer);
 951                 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
 952                 rcu_read_unlock();
 953
 954                 spin_lock_bh(&sdata->u.mgd.teardown_lock);
 955                 if (try_resend && !sdata->u.mgd.teardown_skb) {
 956                         /* Mark it as requiring TX status callback  */
 957                         flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 958                                  IEEE80211_TX_INTFL_MLME_CONN_TX;
 959
 960                         /*
 961                          * skb is copied since mac80211 will later set
 962                          * properties that might not be the same as the AP,
 963                          * such as encryption, QoS, addresses, etc.
 964                          *
 965                          * No problem if skb_copy() fails, so no need to check.
 966                          */
 967                         sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
 968                         sdata->u.mgd.orig_teardown_skb = skb;
 969                 }
 970                 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
 971         }
 972
 973         /* disable bottom halves when entering the Tx path */
 974         local_bh_disable();
 975         __ieee80211_subif_start_xmit(skb, dev, flags);
 976         local_bh_enable();
 977
 978         return ret;
 979
 980 fail:
 981         dev_kfree_skb(skb);
 982         return ret;
 983 }
 984
 985 static int
 986 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
 987                           const u8 *peer, u8 action_code, u8 dialog_token,
 988                           u16 status_code, u32 peer_capability, bool initiator,
 989                           const u8 *extra_ies, size_t extra_ies_len)
 990 {
 991         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 992         struct ieee80211_local *local = sdata->local;
 993         int ret;
 994
 995         mutex_lock(&local->mtx);
 996
 997         /* we don't support concurrent TDLS peer setups */
 998         if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
 999             !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1000                 ret = -EBUSY;
1001                 goto out_unlock;
1002         }
1003
1004         /*
1005          * make sure we have a STA representing the peer so we drop or buffer
1006          * non-TDLS-setup frames to the peer. We can't send other packets
1007          * during setup through the AP path.
1008          * Allow error packets to be sent - sometimes we don't even add a STA
1009          * before failing the setup.
1010          */
1011         if (status_code == 0) {
1012                 rcu_read_lock();
1013                 if (!sta_info_get(sdata, peer)) {
1014                         rcu_read_unlock();
1015                         ret = -ENOLINK;
1016                         goto out_unlock;
1017                 }
1018                 rcu_read_unlock();
1019         }
1020
1021         ieee80211_flush_queues(local, sdata, false);
1022         memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1023         mutex_unlock(&local->mtx);
1024
1025         /* we cannot take the mutex while preparing the setup packet */
1026         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1027                                               dialog_token, status_code,
1028                                               peer_capability, initiator,
1029                                               extra_ies, extra_ies_len, 0,
1030                                               NULL);
1031         if (ret < 0) {
1032                 mutex_lock(&local->mtx);
1033                 eth_zero_addr(sdata->u.mgd.tdls_peer);
1034                 mutex_unlock(&local->mtx);
1035                 return ret;
1036         }
1037
1038         ieee80211_queue_delayed_work(&sdata->local->hw,
1039                                      &sdata->u.mgd.tdls_peer_del_work,
1040                                      TDLS_PEER_SETUP_TIMEOUT);
1041         return 0;
1042
1043 out_unlock:
1044         mutex_unlock(&local->mtx);
1045         return ret;
1046 }
1047
1048 static int
1049 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1050                              const u8 *peer, u8 action_code, u8 dialog_token,
1051                              u16 status_code, u32 peer_capability,
1052                              bool initiator, const u8 *extra_ies,
1053                              size_t extra_ies_len)
1054 {
1055         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1056         struct ieee80211_local *local = sdata->local;
1057         struct sta_info *sta;
1058         int ret;
1059
1060         /*
1061          * No packets can be transmitted to the peer via the AP during setup -
1062          * the STA is set as a TDLS peer, but is not authorized.
1063          * During teardown, we prevent direct transmissions by stopping the
1064          * queues and flushing all direct packets.
1065          */
1066         ieee80211_stop_vif_queues(local, sdata,
1067                                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1068         ieee80211_flush_queues(local, sdata, false);
1069
1070         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1071                                               dialog_token, status_code,
1072                                               peer_capability, initiator,
1073                                               extra_ies, extra_ies_len, 0,
1074                                               NULL);
1075         if (ret < 0)
1076                 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1077                           ret);
1078
1079         /*
1080          * Remove the STA AUTH flag to force further traffic through the AP. If
1081          * the STA was unreachable, it was already removed.
1082          */
1083         rcu_read_lock();
1084         sta = sta_info_get(sdata, peer);
1085         if (sta)
1086                 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1087         rcu_read_unlock();
1088
1089         ieee80211_wake_vif_queues(local, sdata,
1090                                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1091
1092         return 0;
1093 }
1094
1095 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1096                         const u8 *peer, u8 action_code, u8 dialog_token,
1097                         u16 status_code, u32 peer_capability,
1098                         bool initiator, const u8 *extra_ies,
1099                         size_t extra_ies_len)
1100 {
1101         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1102         int ret;
1103
1104         if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1105                 return -ENOTSUPP;
1106
1107         /* make sure we are in managed mode, and associated */
1108         if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1109             !sdata->u.mgd.associated)
1110                 return -EINVAL;
1111
1112         switch (action_code) {
1113         case WLAN_TDLS_SETUP_REQUEST:
1114         case WLAN_TDLS_SETUP_RESPONSE:
1115                 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1116                                                 dialog_token, status_code,
1117                                                 peer_capability, initiator,
1118                                                 extra_ies, extra_ies_len);
1119                 break;
1120         case WLAN_TDLS_TEARDOWN:
1121                 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1122                                                    action_code, dialog_token,
1123                                                    status_code,
1124                                                    peer_capability, initiator,
1125                                                    extra_ies, extra_ies_len);
1126                 break;
1127         case WLAN_TDLS_DISCOVERY_REQUEST:
1128                 /*
1129                  * Protect the discovery so we can hear the TDLS discovery
1130                  * response frame. It is transmitted directly and not buffered
1131                  * by the AP.
1132                  */
1133                 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1134                 /* fall-through */
1135         case WLAN_TDLS_SETUP_CONFIRM:
1136         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1137                 /* no special handling */
1138                 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1139                                                       action_code,
1140                                                       dialog_token,
1141                                                       status_code,
1142                                                       peer_capability,
1143                                                       initiator, extra_ies,
1144                                                       extra_ies_len, 0, NULL);
1145                 break;
1146         default:
1147                 ret = -EOPNOTSUPP;
1148                 break;
1149         }
1150
1151         tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1152                  action_code, peer, ret);
1153         return ret;
1154 }
1155
1156 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1157                         const u8 *peer, enum nl80211_tdls_operation oper)
1158 {
1159         struct sta_info *sta;
1160         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1161         struct ieee80211_local *local = sdata->local;
1162         int ret;
1163
1164         if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1165                 return -ENOTSUPP;
1166
1167         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1168                 return -EINVAL;
1169
1170         switch (oper) {
1171         case NL80211_TDLS_ENABLE_LINK:
1172         case NL80211_TDLS_DISABLE_LINK:
1173                 break;
1174         case NL80211_TDLS_TEARDOWN:
1175         case NL80211_TDLS_SETUP:
1176         case NL80211_TDLS_DISCOVERY_REQ:
1177                 /* We don't support in-driver setup/teardown/discovery */
1178                 return -ENOTSUPP;
1179         }
1180
1181         mutex_lock(&local->mtx);
1182         tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1183
1184         switch (oper) {
1185         case NL80211_TDLS_ENABLE_LINK:
1186                 if (sdata->vif.csa_active) {
1187                         tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1188                         ret = -EBUSY;
1189                         break;
1190                 }
1191
1192                 rcu_read_lock();
1193                 sta = sta_info_get(sdata, peer);
1194                 if (!sta) {
1195                         rcu_read_unlock();
1196                         ret = -ENOLINK;
1197                         break;
1198                 }
1199
1200                 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1201                 rcu_read_unlock();
1202
1203                 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1204                              !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1205                 ret = 0;
1206                 break;
1207         case NL80211_TDLS_DISABLE_LINK:
1208                 /*
1209                  * The teardown message in ieee80211_tdls_mgmt_teardown() was
1210                  * created while the queues were stopped, so it might still be
1211                  * pending. Before flushing the queues we need to be sure the
1212                  * message is handled by the tasklet handling pending messages,
1213                  * otherwise we might start destroying the station before
1214                  * sending the teardown packet.
1215                  * Note that this only forces the tasklet to flush pendings -
1216                  * not to stop the tasklet from rescheduling itself.
1217                  */
1218                 tasklet_kill(&local->tx_pending_tasklet);
1219                 /* flush a potentially queued teardown packet */
1220                 ieee80211_flush_queues(local, sdata, false);
1221
1222                 ret = sta_info_destroy_addr(sdata, peer);
1223                 break;
1224         default:
1225                 ret = -ENOTSUPP;
1226                 break;
1227         }
1228
1229         if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1230                 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1231                 eth_zero_addr(sdata->u.mgd.tdls_peer);
1232         }
1233
1234         mutex_unlock(&local->mtx);
1235         return ret;
1236 }
1237
1238 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1239                                  enum nl80211_tdls_operation oper,
1240                                  u16 reason_code, gfp_t gfp)
1241 {
1242         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1243
1244         if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1245                 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1246                           oper);
1247                 return;
1248         }
1249
1250         cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1251 }
1252 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1253
1254 static void
1255 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1256 {
1257         struct ieee80211_ch_switch_timing *ch_sw;
1258
1259         *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1260         *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1261
1262         ch_sw = (void *)buf;
1263         ch_sw->switch_time = cpu_to_le16(switch_time);
1264         ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1265 }
1266
1267 /* find switch timing IE in SKB ready for Tx */
1268 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1269 {
1270         struct ieee80211_tdls_data *tf;
1271         const u8 *ie_start;
1272
1273         /*
1274          * Get the offset for the new location of the switch timing IE.
1275          * The SKB network header will now point to the "payload_type"
1276          * element of the TDLS data frame struct.
1277          */
1278         tf = container_of(skb->data + skb_network_offset(skb),
1279                           struct ieee80211_tdls_data, payload_type);
1280         ie_start = tf->u.chan_switch_req.variable;
1281         return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1282                                 skb->len - (ie_start - skb->data));
1283 }
1284
1285 static struct sk_buff *
1286 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1287                               struct cfg80211_chan_def *chandef,
1288                               u32 *ch_sw_tm_ie_offset)
1289 {
1290         struct ieee80211_sub_if_data *sdata = sta->sdata;
1291         u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1292                      2 + sizeof(struct ieee80211_ch_switch_timing)];
1293         int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1294         u8 *pos = extra_ies;
1295         struct sk_buff *skb;
1296
1297         /*
1298          * if chandef points to a wide channel add a Secondary-Channel
1299          * Offset information element
1300          */
1301         if (chandef->width == NL80211_CHAN_WIDTH_40) {
1302                 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1303                 bool ht40plus;
1304
1305                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1306                 *pos++ = sizeof(*sec_chan_ie);
1307                 sec_chan_ie = (void *)pos;
1308
1309                 ht40plus = cfg80211_get_chandef_type(chandef) ==
1310                                                         NL80211_CHAN_HT40PLUS;
1311                 sec_chan_ie->sec_chan_offs = ht40plus ?
1312                                              IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1313                                              IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1314                 pos += sizeof(*sec_chan_ie);
1315
1316                 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1317         }
1318
1319         /* just set the values to 0, this is a template */
1320         iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1321
1322         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1323                                               WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1324                                               0, 0, !sta->sta.tdls_initiator,
1325                                               extra_ies, extra_ies_len,
1326                                               oper_class, chandef);
1327         if (!skb)
1328                 return NULL;
1329
1330         skb = ieee80211_build_data_template(sdata, skb, 0);
1331         if (IS_ERR(skb)) {
1332                 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1333                 return NULL;
1334         }
1335
1336         if (ch_sw_tm_ie_offset) {
1337                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1338
1339                 if (!tm_ie) {
1340                         tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1341                         dev_kfree_skb_any(skb);
1342                         return NULL;
1343                 }
1344
1345                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1346         }
1347
1348         tdls_dbg(sdata,
1349                  "TDLS channel switch request template for %pM ch %d width %d\n",
1350                  sta->sta.addr, chandef->chan->center_freq, chandef->width);
1351         return skb;
1352 }
1353
1354 int
1355 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1356                               const u8 *addr, u8 oper_class,
1357                               struct cfg80211_chan_def *chandef)
1358 {
1359         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1360         struct ieee80211_local *local = sdata->local;
1361         struct sta_info *sta;
1362         struct sk_buff *skb = NULL;
1363         u32 ch_sw_tm_ie;
1364         int ret;
1365
1366         mutex_lock(&local->sta_mtx);
1367         sta = sta_info_get(sdata, addr);
1368         if (!sta) {
1369                 tdls_dbg(sdata,
1370                          "Invalid TDLS peer %pM for channel switch request\n",
1371                          addr);
1372                 ret = -ENOENT;
1373                 goto out;
1374         }
1375
1376         if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1377                 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1378                          addr);
1379                 ret = -ENOTSUPP;
1380                 goto out;
1381         }
1382
1383         skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1384                                             &ch_sw_tm_ie);
1385         if (!skb) {
1386                 ret = -ENOENT;
1387                 goto out;
1388         }
1389
1390         ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1391                                       chandef, skb, ch_sw_tm_ie);
1392         if (!ret)
1393                 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1394
1395 out:
1396         mutex_unlock(&local->sta_mtx);
1397         dev_kfree_skb_any(skb);
1398         return ret;
1399 }
1400
1401 void
1402 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1403                                      struct net_device *dev,
1404                                      const u8 *addr)
1405 {
1406         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1407         struct ieee80211_local *local = sdata->local;
1408         struct sta_info *sta;
1409
1410         mutex_lock(&local->sta_mtx);
1411         sta = sta_info_get(sdata, addr);
1412         if (!sta) {
1413                 tdls_dbg(sdata,
1414                          "Invalid TDLS peer %pM for channel switch cancel\n",
1415                          addr);
1416                 goto out;
1417         }
1418
1419         if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1420                 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1421                          addr);
1422                 goto out;
1423         }
1424
1425         drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1426         clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1427
1428 out:
1429         mutex_unlock(&local->sta_mtx);
1430 }
1431
1432 static struct sk_buff *
1433 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1434                                    u32 *ch_sw_tm_ie_offset)
1435 {
1436         struct ieee80211_sub_if_data *sdata = sta->sdata;
1437         struct sk_buff *skb;
1438         u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1439
1440         /* initial timing are always zero in the template */
1441         iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1442
1443         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1444                                         WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1445                                         0, 0, !sta->sta.tdls_initiator,
1446                                         extra_ies, sizeof(extra_ies), 0, NULL);
1447         if (!skb)
1448                 return NULL;
1449
1450         skb = ieee80211_build_data_template(sdata, skb, 0);
1451         if (IS_ERR(skb)) {
1452                 tdls_dbg(sdata,
1453                          "Failed building TDLS channel switch resp frame\n");
1454                 return NULL;
1455         }
1456
1457         if (ch_sw_tm_ie_offset) {
1458                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1459
1460                 if (!tm_ie) {
1461                         tdls_dbg(sdata,
1462                                  "No switch timing IE in TDLS switch resp\n");
1463                         dev_kfree_skb_any(skb);
1464                         return NULL;
1465                 }
1466
1467                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1468         }
1469
1470         tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1471                  sta->sta.addr);
1472         return skb;
1473 }
1474
1475 static int
1476 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1477                                            struct sk_buff *skb)
1478 {
1479         struct ieee80211_local *local = sdata->local;
1480         struct ieee802_11_elems elems;
1481         struct sta_info *sta;
1482         struct ieee80211_tdls_data *tf = (void *)skb->data;
1483         bool local_initiator;
1484         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1485         int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1486         struct ieee80211_tdls_ch_sw_params params = {};
1487         int ret;
1488
1489         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1490         params.timestamp = rx_status->device_timestamp;
1491
1492         if (skb->len < baselen) {
1493                 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1494                          skb->len);
1495                 return -EINVAL;
1496         }
1497
1498         mutex_lock(&local->sta_mtx);
1499         sta = sta_info_get(sdata, tf->sa);
1500         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1501                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1502                          tf->sa);
1503                 ret = -EINVAL;
1504                 goto out;
1505         }
1506
1507         params.sta = &sta->sta;
1508         params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1509         if (params.status != 0) {
1510                 ret = 0;
1511                 goto call_drv;
1512         }
1513
1514         ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1515                                skb->len - baselen, false, &elems);
1516         if (elems.parse_error) {
1517                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1518                 ret = -EINVAL;
1519                 goto out;
1520         }
1521
1522         if (!elems.ch_sw_timing || !elems.lnk_id) {
1523                 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1524                 ret = -EINVAL;
1525                 goto out;
1526         }
1527
1528         /* validate the initiator is set correctly */
1529         local_initiator =
1530                 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1531         if (local_initiator == sta->sta.tdls_initiator) {
1532                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1533                 ret = -EINVAL;
1534                 goto out;
1535         }
1536
1537         params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1538         params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1539
1540         params.tmpl_skb =
1541                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1542         if (!params.tmpl_skb) {
1543                 ret = -ENOENT;
1544                 goto out;
1545         }
1546
1547 call_drv:
1548         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1549
1550         tdls_dbg(sdata,
1551                  "TDLS channel switch response received from %pM status %d\n",
1552                  tf->sa, params.status);
1553
1554 out:
1555         mutex_unlock(&local->sta_mtx);
1556         dev_kfree_skb_any(params.tmpl_skb);
1557         return ret;
1558 }
1559
1560 static int
1561 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1562                                           struct sk_buff *skb)
1563 {
1564         struct ieee80211_local *local = sdata->local;
1565         struct ieee802_11_elems elems;
1566         struct cfg80211_chan_def chandef;
1567         struct ieee80211_channel *chan;
1568         enum nl80211_channel_type chan_type;
1569         int freq;
1570         u8 target_channel, oper_class;
1571         bool local_initiator;
1572         struct sta_info *sta;
1573         enum ieee80211_band band;
1574         struct ieee80211_tdls_data *tf = (void *)skb->data;
1575         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1576         int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1577         struct ieee80211_tdls_ch_sw_params params = {};
1578         int ret = 0;
1579
1580         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1581         params.timestamp = rx_status->device_timestamp;
1582
1583         if (skb->len < baselen) {
1584                 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1585                          skb->len);
1586                 return -EINVAL;
1587         }
1588
1589         target_channel = tf->u.chan_switch_req.target_channel;
1590         oper_class = tf->u.chan_switch_req.oper_class;
1591
1592         /*
1593          * We can't easily infer the channel band. The operating class is
1594          * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1595          * solution here is to treat channels with number >14 as 5GHz ones,
1596          * and specifically check for the (oper_class, channel) combinations
1597          * where this doesn't hold. These are thankfully unique according to
1598          * IEEE802.11-2012.
1599          * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1600          * valid here.
1601          */
1602         if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1603              oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1604              target_channel < 14)
1605                 band = IEEE80211_BAND_5GHZ;
1606         else
1607                 band = target_channel < 14 ? IEEE80211_BAND_2GHZ :
1608                                              IEEE80211_BAND_5GHZ;
1609
1610         freq = ieee80211_channel_to_frequency(target_channel, band);
1611         if (freq == 0) {
1612                 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1613                          target_channel);
1614                 return -EINVAL;
1615         }
1616
1617         chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1618         if (!chan) {
1619                 tdls_dbg(sdata,
1620                          "Unsupported channel for TDLS chan switch: %d\n",
1621                          target_channel);
1622                 return -EINVAL;
1623         }
1624
1625         ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1626                                skb->len - baselen, false, &elems);
1627         if (elems.parse_error) {
1628                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1629                 return -EINVAL;
1630         }
1631
1632         if (!elems.ch_sw_timing || !elems.lnk_id) {
1633                 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1634                 return -EINVAL;
1635         }
1636
1637         mutex_lock(&local->sta_mtx);
1638         sta = sta_info_get(sdata, tf->sa);
1639         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1640                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1641                          tf->sa);
1642                 ret = -EINVAL;
1643                 goto out;
1644         }
1645
1646         params.sta = &sta->sta;
1647
1648         /* validate the initiator is set correctly */
1649         local_initiator =
1650                 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1651         if (local_initiator == sta->sta.tdls_initiator) {
1652                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1653                 ret = -EINVAL;
1654                 goto out;
1655         }
1656
1657         if (!sta->sta.ht_cap.ht_supported) {
1658                 chan_type = NL80211_CHAN_NO_HT;
1659         } else if (!elems.sec_chan_offs) {
1660                 chan_type = NL80211_CHAN_HT20;
1661         } else {
1662                 switch (elems.sec_chan_offs->sec_chan_offs) {
1663                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1664                         chan_type = NL80211_CHAN_HT40PLUS;
1665                         break;
1666                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1667                         chan_type = NL80211_CHAN_HT40MINUS;
1668                         break;
1669                 default:
1670                         chan_type = NL80211_CHAN_HT20;
1671                         break;
1672                 }
1673         }
1674
1675         cfg80211_chandef_create(&chandef, chan, chan_type);
1676         params.chandef = &chandef;
1677
1678         params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1679         params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1680
1681         params.tmpl_skb =
1682                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1683                                                    &params.ch_sw_tm_ie);
1684         if (!params.tmpl_skb) {
1685                 ret = -ENOENT;
1686                 goto out;
1687         }
1688
1689         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1690
1691         tdls_dbg(sdata,
1692                  "TDLS ch switch request received from %pM ch %d width %d\n",
1693                  tf->sa, params.chandef->chan->center_freq,
1694                  params.chandef->width);
1695 out:
1696         mutex_unlock(&local->sta_mtx);
1697         dev_kfree_skb_any(params.tmpl_skb);
1698         return ret;
1699 }
1700
1701 void ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1702                                            struct sk_buff *skb)
1703 {
1704         struct ieee80211_tdls_data *tf = (void *)skb->data;
1705         struct wiphy *wiphy = sdata->local->hw.wiphy;
1706
1707         /* make sure the driver supports it */
1708         if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1709                 return;
1710
1711         /* we want to access the entire packet */
1712         if (skb_linearize(skb))
1713                 return;
1714         /*
1715          * The packet/size was already validated by mac80211 Rx path, only look
1716          * at the action type.
1717          */
1718         switch (tf->action_code) {
1719         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1720                 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1721                 break;
1722         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1723                 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1724                 break;
1725         default:
1726                 WARN_ON_ONCE(1);
1727                 return;
1728         }
1729 }