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  * Copyright 2015 - 2016 Intel Deutschland GmbH
   8  *
   9  * This file is GPLv2 as found in COPYING.
  10  */
  11
  12 #include <linux/ieee80211.h>
  13 #include <linux/log2.h>
  14 #include <net/cfg80211.h>
  15 #include <linux/rtnetlink.h>
  16 #include "ieee80211_i.h"
  17 #include "driver-ops.h"
  18 #include "rate.h"
  19
  20 /* give usermode some time for retries in setting up the TDLS session */
  21 #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ)
  22
  23 void ieee80211_tdls_peer_del_work(struct work_struct *wk)
  24 {
  25         struct ieee80211_sub_if_data *sdata;
  26         struct ieee80211_local *local;
  27
  28         sdata = container_of(wk, struct ieee80211_sub_if_data,
  29                              u.mgd.tdls_peer_del_work.work);
  30         local = sdata->local;
  31
  32         mutex_lock(&local->mtx);
  33         if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
  34                 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
  35                 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
  36                 eth_zero_addr(sdata->u.mgd.tdls_peer);
  37         }
  38         mutex_unlock(&local->mtx);
  39 }
  40
  41 static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata,
  42                                          struct sk_buff *skb)
  43 {
  44         struct ieee80211_local *local = sdata->local;
  45         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  46         bool chan_switch = local->hw.wiphy->features &
  47                            NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
  48         bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
  49                           !ifmgd->tdls_wider_bw_prohibited;
  50         struct ieee80211_supported_band *sband = ieee80211_get_sband(sdata);
  51         bool vht = sband && sband->vht_cap.vht_supported;
  52         u8 *pos = skb_put(skb, 10);
  53
  54         *pos++ = WLAN_EID_EXT_CAPABILITY;
  55         *pos++ = 8; /* len */
  56         *pos++ = 0x0;
  57         *pos++ = 0x0;
  58         *pos++ = 0x0;
  59         *pos++ = chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0;
  60         *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
  61         *pos++ = 0;
  62         *pos++ = 0;
  63         *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
  64 }
  65
  66 static u8
  67 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
  68                            struct sk_buff *skb, u16 start, u16 end,
  69                            u16 spacing)
  70 {
  71         u8 subband_cnt = 0, ch_cnt = 0;
  72         struct ieee80211_channel *ch;
  73         struct cfg80211_chan_def chandef;
  74         int i, subband_start;
  75         struct wiphy *wiphy = sdata->local->hw.wiphy;
  76
  77         for (i = start; i <= end; i += spacing) {
  78                 if (!ch_cnt)
  79                         subband_start = i;
  80
  81                 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
  82                 if (ch) {
  83                         /* we will be active on the channel */
  84                         cfg80211_chandef_create(&chandef, ch,
  85                                                 NL80211_CHAN_NO_HT);
  86                         if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
  87                                                           sdata->wdev.iftype)) {
  88                                 ch_cnt++;
  89                                 /*
  90                                  * check if the next channel is also part of
  91                                  * this allowed range
  92                                  */
  93                                 continue;
  94                         }
  95                 }
  96
  97                 /*
  98                  * we've reached the end of a range, with allowed channels
  99                  * found
 100                  */
 101                 if (ch_cnt) {
 102                         u8 *pos = skb_put(skb, 2);
 103                         *pos++ = ieee80211_frequency_to_channel(subband_start);
 104                         *pos++ = ch_cnt;
 105
 106                         subband_cnt++;
 107                         ch_cnt = 0;
 108                 }
 109         }
 110
 111         /* all channels in the requested range are allowed - add them here */
 112         if (ch_cnt) {
 113                 u8 *pos = skb_put(skb, 2);
 114                 *pos++ = ieee80211_frequency_to_channel(subband_start);
 115                 *pos++ = ch_cnt;
 116
 117                 subband_cnt++;
 118         }
 119
 120         return subband_cnt;
 121 }
 122
 123 static void
 124 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
 125                                  struct sk_buff *skb)
 126 {
 127         /*
 128          * Add possible channels for TDLS. These are channels that are allowed
 129          * to be active.
 130          */
 131         u8 subband_cnt;
 132         u8 *pos = skb_put(skb, 2);
 133
 134         *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 135
 136         /*
 137          * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
 138          * this doesn't happen in real world scenarios.
 139          */
 140
 141         /* 2GHz, with 5MHz spacing */
 142         subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
 143
 144         /* 5GHz, with 20MHz spacing */
 145         subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
 146
 147         /* length */
 148         *pos = 2 * subband_cnt;
 149 }
 150
 151 static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata,
 152                                             struct sk_buff *skb)
 153 {
 154         u8 *pos;
 155         u8 op_class;
 156
 157         if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef,
 158                                                   &op_class))
 159                 return;
 160
 161         pos = skb_put(skb, 4);
 162         *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
 163         *pos++ = 2; /* len */
 164
 165         *pos++ = op_class;
 166         *pos++ = op_class; /* give current operating class as alternate too */
 167 }
 168
 169 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
 170 {
 171         u8 *pos = skb_put(skb, 3);
 172
 173         *pos++ = WLAN_EID_BSS_COEX_2040;
 174         *pos++ = 1; /* len */
 175
 176         *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
 177 }
 178
 179 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
 180                                         u16 status_code)
 181 {
 182         struct ieee80211_supported_band *sband;
 183
 184         /* The capability will be 0 when sending a failure code */
 185         if (status_code != 0)
 186                 return 0;
 187
 188         sband = ieee80211_get_sband(sdata);
 189         if (sband && sband->band == NL80211_BAND_2GHZ) {
 190                 return WLAN_CAPABILITY_SHORT_SLOT_TIME |
 191                        WLAN_CAPABILITY_SHORT_PREAMBLE;
 192         }
 193
 194         return 0;
 195 }
 196
 197 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
 198                                        struct sk_buff *skb, const u8 *peer,
 199                                        bool initiator)
 200 {
 201         struct ieee80211_tdls_lnkie *lnkid;
 202         const u8 *init_addr, *rsp_addr;
 203
 204         if (initiator) {
 205                 init_addr = sdata->vif.addr;
 206                 rsp_addr = peer;
 207         } else {
 208                 init_addr = peer;
 209                 rsp_addr = sdata->vif.addr;
 210         }
 211
 212         lnkid = skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
 213
 214         lnkid->ie_type = WLAN_EID_LINK_ID;
 215         lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
 216
 217         memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 218         memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
 219         memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
 220 }
 221
 222 static void
 223 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 224 {
 225         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 226         u8 *pos = skb_put(skb, 4);
 227
 228         *pos++ = WLAN_EID_AID;
 229         *pos++ = 2; /* len */
 230         put_unaligned_le16(ifmgd->aid, pos);
 231 }
 232
 233 /* translate numbering in the WMM parameter IE to the mac80211 notation */
 234 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
 235 {
 236         switch (ac) {
 237         default:
 238                 WARN_ON_ONCE(1);
 239         case 0:
 240                 return IEEE80211_AC_BE;
 241         case 1:
 242                 return IEEE80211_AC_BK;
 243         case 2:
 244                 return IEEE80211_AC_VI;
 245         case 3:
 246                 return IEEE80211_AC_VO;
 247         }
 248 }
 249
 250 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
 251 {
 252         u8 ret;
 253
 254         ret = aifsn & 0x0f;
 255         if (acm)
 256                 ret |= 0x10;
 257         ret |= (aci << 5) & 0x60;
 258         return ret;
 259 }
 260
 261 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
 262 {
 263         return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
 264                ((ilog2(cw_max + 1) << 0x4) & 0xf0);
 265 }
 266
 267 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
 268                                             struct sk_buff *skb)
 269 {
 270         struct ieee80211_wmm_param_ie *wmm;
 271         struct ieee80211_tx_queue_params *txq;
 272         int i;
 273
 274         wmm = skb_put_zero(skb, sizeof(*wmm));
 275
 276         wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
 277         wmm->len = sizeof(*wmm) - 2;
 278
 279         wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
 280         wmm->oui[1] = 0x50;
 281         wmm->oui[2] = 0xf2;
 282         wmm->oui_type = 2; /* WME */
 283         wmm->oui_subtype = 1; /* WME param */
 284         wmm->version = 1; /* WME ver */
 285         wmm->qos_info = 0; /* U-APSD not in use */
 286
 287         /*
 288          * Use the EDCA parameters defined for the BSS, or default if the AP
 289          * doesn't support it, as mandated by 802.11-2012 section 10.22.4
 290          */
 291         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 292                 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
 293                 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
 294                                                                txq->acm, i);
 295                 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
 296                 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
 297         }
 298 }
 299
 300 static void
 301 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
 302                                    struct sta_info *sta)
 303 {
 304         /* IEEE802.11ac-2013 Table E-4 */
 305         u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
 306         struct cfg80211_chan_def uc = sta->tdls_chandef;
 307         enum nl80211_chan_width max_width = ieee80211_sta_cap_chan_bw(sta);
 308         int i;
 309
 310         /* only support upgrading non-narrow channels up to 80Mhz */
 311         if (max_width == NL80211_CHAN_WIDTH_5 ||
 312             max_width == NL80211_CHAN_WIDTH_10)
 313                 return;
 314
 315         if (max_width > NL80211_CHAN_WIDTH_80)
 316                 max_width = NL80211_CHAN_WIDTH_80;
 317
 318         if (uc.width >= max_width)
 319                 return;
 320         /*
 321          * Channel usage constrains in the IEEE802.11ac-2013 specification only
 322          * allow expanding a 20MHz channel to 80MHz in a single way. In
 323          * addition, there are no 40MHz allowed channels that are not part of
 324          * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
 325          */
 326         for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
 327                 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
 328                         uc.center_freq1 = centers_80mhz[i];
 329                         uc.center_freq2 = 0;
 330                         uc.width = NL80211_CHAN_WIDTH_80;
 331                         break;
 332                 }
 333
 334         if (!uc.center_freq1)
 335                 return;
 336
 337         /* proceed to downgrade the chandef until usable or the same as AP BW */
 338         while (uc.width > max_width ||
 339                (uc.width > sta->tdls_chandef.width &&
 340                 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
 341                                                sdata->wdev.iftype)))
 342                 ieee80211_chandef_downgrade(&uc);
 343
 344         if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
 345                 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
 346                          sta->tdls_chandef.width, uc.width);
 347
 348                 /*
 349                  * the station is not yet authorized when BW upgrade is done,
 350                  * locking is not required
 351                  */
 352                 sta->tdls_chandef = uc;
 353         }
 354 }
 355
 356 static void
 357 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
 358                                    struct sk_buff *skb, const u8 *peer,
 359                                    u8 action_code, bool initiator,
 360                                    const u8 *extra_ies, size_t extra_ies_len)
 361 {
 362         struct ieee80211_supported_band *sband;
 363         struct ieee80211_local *local = sdata->local;
 364         struct ieee80211_sta_ht_cap ht_cap;
 365         struct ieee80211_sta_vht_cap vht_cap;
 366         struct sta_info *sta = NULL;
 367         size_t offset = 0, noffset;
 368         u8 *pos;
 369
 370         sband = ieee80211_get_sband(sdata);
 371         if (!sband)
 372                 return;
 373
 374         ieee80211_add_srates_ie(sdata, skb, false, sband->band);
 375         ieee80211_add_ext_srates_ie(sdata, skb, false, sband->band);
 376         ieee80211_tdls_add_supp_channels(sdata, skb);
 377
 378         /* add any custom IEs that go before Extended Capabilities */
 379         if (extra_ies_len) {
 380                 static const u8 before_ext_cap[] = {
 381                         WLAN_EID_SUPP_RATES,
 382                         WLAN_EID_COUNTRY,
 383                         WLAN_EID_EXT_SUPP_RATES,
 384                         WLAN_EID_SUPPORTED_CHANNELS,
 385                         WLAN_EID_RSN,
 386                 };
 387                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 388                                              before_ext_cap,
 389                                              ARRAY_SIZE(before_ext_cap),
 390                                              offset);
 391                 pos = skb_put_data(skb, extra_ies + offset, noffset - offset);
 392                 offset = noffset;
 393         }
 394
 395         ieee80211_tdls_add_ext_capab(sdata, skb);
 396
 397         /* add the QoS element if we support it */
 398         if (local->hw.queues >= IEEE80211_NUM_ACS &&
 399             action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
 400                 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
 401
 402         /* add any custom IEs that go before HT capabilities */
 403         if (extra_ies_len) {
 404                 static const u8 before_ht_cap[] = {
 405                         WLAN_EID_SUPP_RATES,
 406                         WLAN_EID_COUNTRY,
 407                         WLAN_EID_EXT_SUPP_RATES,
 408                         WLAN_EID_SUPPORTED_CHANNELS,
 409                         WLAN_EID_RSN,
 410                         WLAN_EID_EXT_CAPABILITY,
 411                         WLAN_EID_QOS_CAPA,
 412                         WLAN_EID_FAST_BSS_TRANSITION,
 413                         WLAN_EID_TIMEOUT_INTERVAL,
 414                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 415                 };
 416                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 417                                              before_ht_cap,
 418                                              ARRAY_SIZE(before_ht_cap),
 419                                              offset);
 420                 pos = skb_put_data(skb, extra_ies + offset, noffset - offset);
 421                 offset = noffset;
 422         }
 423
 424         mutex_lock(&local->sta_mtx);
 425
 426         /* we should have the peer STA if we're already responding */
 427         if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
 428                 sta = sta_info_get(sdata, peer);
 429                 if (WARN_ON_ONCE(!sta)) {
 430                         mutex_unlock(&local->sta_mtx);
 431                         return;
 432                 }
 433
 434                 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
 435         }
 436
 437         ieee80211_tdls_add_oper_classes(sdata, skb);
 438
 439         /*
 440          * with TDLS we can switch channels, and HT-caps are not necessarily
 441          * the same on all bands. The specification limits the setup to a
 442          * single HT-cap, so use the current band for now.
 443          */
 444         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 445
 446         if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 447              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 448             ht_cap.ht_supported) {
 449                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 450
 451                 /* disable SMPS in TDLS initiator */
 452                 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
 453                                 << IEEE80211_HT_CAP_SM_PS_SHIFT;
 454
 455                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 456                 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 457         } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 458                    ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
 459                 /* the peer caps are already intersected with our own */
 460                 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
 461
 462                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 463                 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 464         }
 465
 466         if (ht_cap.ht_supported &&
 467             (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
 468                 ieee80211_tdls_add_bss_coex_ie(skb);
 469
 470         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 471
 472         /* add any custom IEs that go before VHT capabilities */
 473         if (extra_ies_len) {
 474                 static const u8 before_vht_cap[] = {
 475                         WLAN_EID_SUPP_RATES,
 476                         WLAN_EID_COUNTRY,
 477                         WLAN_EID_EXT_SUPP_RATES,
 478                         WLAN_EID_SUPPORTED_CHANNELS,
 479                         WLAN_EID_RSN,
 480                         WLAN_EID_EXT_CAPABILITY,
 481                         WLAN_EID_QOS_CAPA,
 482                         WLAN_EID_FAST_BSS_TRANSITION,
 483                         WLAN_EID_TIMEOUT_INTERVAL,
 484                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 485                         WLAN_EID_MULTI_BAND,
 486                 };
 487                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 488                                              before_vht_cap,
 489                                              ARRAY_SIZE(before_vht_cap),
 490                                              offset);
 491                 pos = skb_put_data(skb, extra_ies + offset, noffset - offset);
 492                 offset = noffset;
 493         }
 494
 495         /* build the VHT-cap similarly to the HT-cap */
 496         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 497         if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 498              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 499             vht_cap.vht_supported) {
 500                 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 501
 502                 /* the AID is present only when VHT is implemented */
 503                 if (action_code == WLAN_TDLS_SETUP_REQUEST)
 504                         ieee80211_tdls_add_aid(sdata, skb);
 505
 506                 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 507                 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 508         } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 509                    vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
 510                 /* the peer caps are already intersected with our own */
 511                 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
 512
 513                 /* the AID is present only when VHT is implemented */
 514                 ieee80211_tdls_add_aid(sdata, skb);
 515
 516                 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 517                 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 518
 519                 /*
 520                  * if both peers support WIDER_BW, we can expand the chandef to
 521                  * a wider compatible one, up to 80MHz
 522                  */
 523                 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 524                         ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 525         }
 526
 527         mutex_unlock(&local->sta_mtx);
 528
 529         /* add any remaining IEs */
 530         if (extra_ies_len) {
 531                 noffset = extra_ies_len;
 532                 pos = skb_put_data(skb, extra_ies + offset, noffset - offset);
 533         }
 534
 535 }
 536
 537 static void
 538 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
 539                                  struct sk_buff *skb, const u8 *peer,
 540                                  bool initiator, const u8 *extra_ies,
 541                                  size_t extra_ies_len)
 542 {
 543         struct ieee80211_local *local = sdata->local;
 544         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 545         size_t offset = 0, noffset;
 546         struct sta_info *sta, *ap_sta;
 547         struct ieee80211_supported_band *sband;
 548         u8 *pos;
 549
 550         sband = ieee80211_get_sband(sdata);
 551         if (!sband)
 552                 return;
 553
 554         mutex_lock(&local->sta_mtx);
 555
 556         sta = sta_info_get(sdata, peer);
 557         ap_sta = sta_info_get(sdata, ifmgd->bssid);
 558         if (WARN_ON_ONCE(!sta || !ap_sta)) {
 559                 mutex_unlock(&local->sta_mtx);
 560                 return;
 561         }
 562
 563         sta->tdls_chandef = sdata->vif.bss_conf.chandef;
 564
 565         /* add any custom IEs that go before the QoS IE */
 566         if (extra_ies_len) {
 567                 static const u8 before_qos[] = {
 568                         WLAN_EID_RSN,
 569                 };
 570                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 571                                              before_qos,
 572                                              ARRAY_SIZE(before_qos),
 573                                              offset);
 574                 pos = skb_put_data(skb, extra_ies + offset, noffset - offset);
 575                 offset = noffset;
 576         }
 577
 578         /* add the QoS param IE if both the peer and we support it */
 579         if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
 580                 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
 581
 582         /* add any custom IEs that go before HT operation */
 583         if (extra_ies_len) {
 584                 static const u8 before_ht_op[] = {
 585                         WLAN_EID_RSN,
 586                         WLAN_EID_QOS_CAPA,
 587                         WLAN_EID_FAST_BSS_TRANSITION,
 588                         WLAN_EID_TIMEOUT_INTERVAL,
 589                 };
 590                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 591                                              before_ht_op,
 592                                              ARRAY_SIZE(before_ht_op),
 593                                              offset);
 594                 pos = skb_put_data(skb, extra_ies + offset, noffset - offset);
 595                 offset = noffset;
 596         }
 597
 598         /*
 599          * if HT support is only added in TDLS, we need an HT-operation IE.
 600          * add the IE as required by IEEE802.11-2012 9.23.3.2.
 601          */
 602         if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
 603                 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
 604                            IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
 605                            IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
 606
 607                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 608                 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
 609                                            &sdata->vif.bss_conf.chandef, prot,
 610                                            true);
 611         }
 612
 613         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 614
 615         /* only include VHT-operation if not on the 2.4GHz band */
 616         if (sband->band != NL80211_BAND_2GHZ &&
 617             sta->sta.vht_cap.vht_supported) {
 618                 /*
 619                  * if both peers support WIDER_BW, we can expand the chandef to
 620                  * a wider compatible one, up to 80MHz
 621                  */
 622                 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 623                         ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 624
 625                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 626                 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
 627                                             &sta->tdls_chandef);
 628         }
 629
 630         mutex_unlock(&local->sta_mtx);
 631
 632         /* add any remaining IEs */
 633         if (extra_ies_len) {
 634                 noffset = extra_ies_len;
 635                 pos = skb_put_data(skb, extra_ies + offset, noffset - offset);
 636         }
 637 }
 638
 639 static void
 640 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
 641                                        struct sk_buff *skb, const u8 *peer,
 642                                        bool initiator, const u8 *extra_ies,
 643                                        size_t extra_ies_len, u8 oper_class,
 644                                        struct cfg80211_chan_def *chandef)
 645 {
 646         struct ieee80211_tdls_data *tf;
 647         size_t offset = 0, noffset;
 648         u8 *pos;
 649
 650         if (WARN_ON_ONCE(!chandef))
 651                 return;
 652
 653         tf = (void *)skb->data;
 654         tf->u.chan_switch_req.target_channel =
 655                 ieee80211_frequency_to_channel(chandef->chan->center_freq);
 656         tf->u.chan_switch_req.oper_class = oper_class;
 657
 658         if (extra_ies_len) {
 659                 static const u8 before_lnkie[] = {
 660                         WLAN_EID_SECONDARY_CHANNEL_OFFSET,
 661                 };
 662                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 663                                              before_lnkie,
 664                                              ARRAY_SIZE(before_lnkie),
 665                                              offset);
 666                 pos = skb_put_data(skb, extra_ies + offset, noffset - offset);
 667                 offset = noffset;
 668         }
 669
 670         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 671
 672         /* add any remaining IEs */
 673         if (extra_ies_len) {
 674                 noffset = extra_ies_len;
 675                 pos = skb_put_data(skb, extra_ies + offset, noffset - offset);
 676         }
 677 }
 678
 679 static void
 680 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
 681                                         struct sk_buff *skb, const u8 *peer,
 682                                         u16 status_code, bool initiator,
 683                                         const u8 *extra_ies,
 684                                         size_t extra_ies_len)
 685 {
 686         if (status_code == 0)
 687                 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 688
 689         if (extra_ies_len)
 690                 skb_put_data(skb, extra_ies, extra_ies_len);
 691 }
 692
 693 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
 694                                    struct sk_buff *skb, const u8 *peer,
 695                                    u8 action_code, u16 status_code,
 696                                    bool initiator, const u8 *extra_ies,
 697                                    size_t extra_ies_len, u8 oper_class,
 698                                    struct cfg80211_chan_def *chandef)
 699 {
 700         switch (action_code) {
 701         case WLAN_TDLS_SETUP_REQUEST:
 702         case WLAN_TDLS_SETUP_RESPONSE:
 703         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 704                 if (status_code == 0)
 705                         ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
 706                                                            action_code,
 707                                                            initiator,
 708                                                            extra_ies,
 709                                                            extra_ies_len);
 710                 break;
 711         case WLAN_TDLS_SETUP_CONFIRM:
 712                 if (status_code == 0)
 713                         ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
 714                                                          initiator, extra_ies,
 715                                                          extra_ies_len);
 716                 break;
 717         case WLAN_TDLS_TEARDOWN:
 718         case WLAN_TDLS_DISCOVERY_REQUEST:
 719                 if (extra_ies_len)
 720                         skb_put_data(skb, extra_ies, extra_ies_len);
 721                 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
 722                         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 723                 break;
 724         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 725                 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
 726                                                        initiator, extra_ies,
 727                                                        extra_ies_len,
 728                                                        oper_class, chandef);
 729                 break;
 730         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 731                 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
 732                                                         status_code,
 733                                                         initiator, extra_ies,
 734                                                         extra_ies_len);
 735                 break;
 736         }
 737
 738 }
 739
 740 static int
 741 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
 742                                const u8 *peer, u8 action_code, u8 dialog_token,
 743                                u16 status_code, struct sk_buff *skb)
 744 {
 745         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 746         struct ieee80211_tdls_data *tf;
 747
 748         tf = skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
 749
 750         memcpy(tf->da, peer, ETH_ALEN);
 751         memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
 752         tf->ether_type = cpu_to_be16(ETH_P_TDLS);
 753         tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
 754
 755         /* network header is after the ethernet header */
 756         skb_set_network_header(skb, ETH_HLEN);
 757
 758         switch (action_code) {
 759         case WLAN_TDLS_SETUP_REQUEST:
 760                 tf->category = WLAN_CATEGORY_TDLS;
 761                 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
 762
 763                 skb_put(skb, sizeof(tf->u.setup_req));
 764                 tf->u.setup_req.dialog_token = dialog_token;
 765                 tf->u.setup_req.capability =
 766                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 767                                                                  status_code));
 768                 break;
 769         case WLAN_TDLS_SETUP_RESPONSE:
 770                 tf->category = WLAN_CATEGORY_TDLS;
 771                 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
 772
 773                 skb_put(skb, sizeof(tf->u.setup_resp));
 774                 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
 775                 tf->u.setup_resp.dialog_token = dialog_token;
 776                 tf->u.setup_resp.capability =
 777                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 778                                                                  status_code));
 779                 break;
 780         case WLAN_TDLS_SETUP_CONFIRM:
 781                 tf->category = WLAN_CATEGORY_TDLS;
 782                 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
 783
 784                 skb_put(skb, sizeof(tf->u.setup_cfm));
 785                 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
 786                 tf->u.setup_cfm.dialog_token = dialog_token;
 787                 break;
 788         case WLAN_TDLS_TEARDOWN:
 789                 tf->category = WLAN_CATEGORY_TDLS;
 790                 tf->action_code = WLAN_TDLS_TEARDOWN;
 791
 792                 skb_put(skb, sizeof(tf->u.teardown));
 793                 tf->u.teardown.reason_code = cpu_to_le16(status_code);
 794                 break;
 795         case WLAN_TDLS_DISCOVERY_REQUEST:
 796                 tf->category = WLAN_CATEGORY_TDLS;
 797                 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
 798
 799                 skb_put(skb, sizeof(tf->u.discover_req));
 800                 tf->u.discover_req.dialog_token = dialog_token;
 801                 break;
 802         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 803                 tf->category = WLAN_CATEGORY_TDLS;
 804                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
 805
 806                 skb_put(skb, sizeof(tf->u.chan_switch_req));
 807                 break;
 808         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 809                 tf->category = WLAN_CATEGORY_TDLS;
 810                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
 811
 812                 skb_put(skb, sizeof(tf->u.chan_switch_resp));
 813                 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
 814                 break;
 815         default:
 816                 return -EINVAL;
 817         }
 818
 819         return 0;
 820 }
 821
 822 static int
 823 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
 824                            const u8 *peer, u8 action_code, u8 dialog_token,
 825                            u16 status_code, struct sk_buff *skb)
 826 {
 827         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 828         struct ieee80211_mgmt *mgmt;
 829
 830         mgmt = skb_put_zero(skb, 24);
 831         memcpy(mgmt->da, peer, ETH_ALEN);
 832         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 833         memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 834
 835         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 836                                           IEEE80211_STYPE_ACTION);
 837
 838         switch (action_code) {
 839         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 840                 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
 841                 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
 842                 mgmt->u.action.u.tdls_discover_resp.action_code =
 843                         WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
 844                 mgmt->u.action.u.tdls_discover_resp.dialog_token =
 845                         dialog_token;
 846                 mgmt->u.action.u.tdls_discover_resp.capability =
 847                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 848                                                                  status_code));
 849                 break;
 850         default:
 851                 return -EINVAL;
 852         }
 853
 854         return 0;
 855 }
 856
 857 static struct sk_buff *
 858 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
 859                                       const u8 *peer, u8 action_code,
 860                                       u8 dialog_token, u16 status_code,
 861                                       bool initiator, const u8 *extra_ies,
 862                                       size_t extra_ies_len, u8 oper_class,
 863                                       struct cfg80211_chan_def *chandef)
 864 {
 865         struct ieee80211_local *local = sdata->local;
 866         struct sk_buff *skb;
 867         int ret;
 868
 869         skb = netdev_alloc_skb(sdata->dev,
 870                                local->hw.extra_tx_headroom +
 871                                max(sizeof(struct ieee80211_mgmt),
 872                                    sizeof(struct ieee80211_tdls_data)) +
 873                                50 + /* supported rates */
 874                                10 + /* ext capab */
 875                                26 + /* max(WMM-info, WMM-param) */
 876                                2 + max(sizeof(struct ieee80211_ht_cap),
 877                                        sizeof(struct ieee80211_ht_operation)) +
 878                                2 + max(sizeof(struct ieee80211_vht_cap),
 879                                        sizeof(struct ieee80211_vht_operation)) +
 880                                50 + /* supported channels */
 881                                3 + /* 40/20 BSS coex */
 882                                4 + /* AID */
 883                                4 + /* oper classes */
 884                                extra_ies_len +
 885                                sizeof(struct ieee80211_tdls_lnkie));
 886         if (!skb)
 887                 return NULL;
 888
 889         skb_reserve(skb, local->hw.extra_tx_headroom);
 890
 891         switch (action_code) {
 892         case WLAN_TDLS_SETUP_REQUEST:
 893         case WLAN_TDLS_SETUP_RESPONSE:
 894         case WLAN_TDLS_SETUP_CONFIRM:
 895         case WLAN_TDLS_TEARDOWN:
 896         case WLAN_TDLS_DISCOVERY_REQUEST:
 897         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 898         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 899                 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
 900                                                      sdata->dev, peer,
 901                                                      action_code, dialog_token,
 902                                                      status_code, skb);
 903                 break;
 904         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 905                 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
 906                                                  peer, action_code,
 907                                                  dialog_token, status_code,
 908                                                  skb);
 909                 break;
 910         default:
 911                 ret = -ENOTSUPP;
 912                 break;
 913         }
 914
 915         if (ret < 0)
 916                 goto fail;
 917
 918         ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
 919                                initiator, extra_ies, extra_ies_len, oper_class,
 920                                chandef);
 921         return skb;
 922
 923 fail:
 924         dev_kfree_skb(skb);
 925         return NULL;
 926 }
 927
 928 static int
 929 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
 930                                 const u8 *peer, u8 action_code, u8 dialog_token,
 931                                 u16 status_code, u32 peer_capability,
 932                                 bool initiator, const u8 *extra_ies,
 933                                 size_t extra_ies_len, u8 oper_class,
 934                                 struct cfg80211_chan_def *chandef)
 935 {
 936         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 937         struct sk_buff *skb = NULL;
 938         struct sta_info *sta;
 939         u32 flags = 0;
 940         int ret = 0;
 941
 942         rcu_read_lock();
 943         sta = sta_info_get(sdata, peer);
 944
 945         /* infer the initiator if we can, to support old userspace */
 946         switch (action_code) {
 947         case WLAN_TDLS_SETUP_REQUEST:
 948                 if (sta) {
 949                         set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
 950                         sta->sta.tdls_initiator = false;
 951                 }
 952                 /* fall-through */
 953         case WLAN_TDLS_SETUP_CONFIRM:
 954         case WLAN_TDLS_DISCOVERY_REQUEST:
 955                 initiator = true;
 956                 break;
 957         case WLAN_TDLS_SETUP_RESPONSE:
 958                 /*
 959                  * In some testing scenarios, we send a request and response.
 960                  * Make the last packet sent take effect for the initiator
 961                  * value.
 962                  */
 963                 if (sta) {
 964                         clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
 965                         sta->sta.tdls_initiator = true;
 966                 }
 967                 /* fall-through */
 968         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 969                 initiator = false;
 970                 break;
 971         case WLAN_TDLS_TEARDOWN:
 972         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 973         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 974                 /* any value is ok */
 975                 break;
 976         default:
 977                 ret = -ENOTSUPP;
 978                 break;
 979         }
 980
 981         if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
 982                 initiator = true;
 983
 984         rcu_read_unlock();
 985         if (ret < 0)
 986                 goto fail;
 987
 988         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
 989                                                     dialog_token, status_code,
 990                                                     initiator, extra_ies,
 991                                                     extra_ies_len, oper_class,
 992                                                     chandef);
 993         if (!skb) {
 994                 ret = -EINVAL;
 995                 goto fail;
 996         }
 997
 998         if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
 999                 ieee80211_tx_skb(sdata, skb);
1000                 return 0;
1001         }
1002
1003         /*
1004          * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1005          * we should default to AC_VI.
1006          */
1007         switch (action_code) {
1008         case WLAN_TDLS_SETUP_REQUEST:
1009         case WLAN_TDLS_SETUP_RESPONSE:
1010                 skb_set_queue_mapping(skb, IEEE80211_AC_BK);
1011                 skb->priority = 2;
1012                 break;
1013         default:
1014                 skb_set_queue_mapping(skb, IEEE80211_AC_VI);
1015                 skb->priority = 5;
1016                 break;
1017         }
1018
1019         /*
1020          * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1021          * Later, if no ACK is returned from peer, we will re-send the teardown
1022          * packet through the AP.
1023          */
1024         if ((action_code == WLAN_TDLS_TEARDOWN) &&
1025             ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1026                 bool try_resend; /* Should we keep skb for possible resend */
1027
1028                 /* If not sending directly to peer - no point in keeping skb */
1029                 rcu_read_lock();
1030                 sta = sta_info_get(sdata, peer);
1031                 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1032                 rcu_read_unlock();
1033
1034                 spin_lock_bh(&sdata->u.mgd.teardown_lock);
1035                 if (try_resend && !sdata->u.mgd.teardown_skb) {
1036                         /* Mark it as requiring TX status callback  */
1037                         flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1038                                  IEEE80211_TX_INTFL_MLME_CONN_TX;
1039
1040                         /*
1041                          * skb is copied since mac80211 will later set
1042                          * properties that might not be the same as the AP,
1043                          * such as encryption, QoS, addresses, etc.
1044                          *
1045                          * No problem if skb_copy() fails, so no need to check.
1046                          */
1047                         sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1048                         sdata->u.mgd.orig_teardown_skb = skb;
1049                 }
1050                 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1051         }
1052
1053         /* disable bottom halves when entering the Tx path */
1054         local_bh_disable();
1055         __ieee80211_subif_start_xmit(skb, dev, flags);
1056         local_bh_enable();
1057
1058         return ret;
1059
1060 fail:
1061         dev_kfree_skb(skb);
1062         return ret;
1063 }
1064
1065 static int
1066 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1067                           const u8 *peer, u8 action_code, u8 dialog_token,
1068                           u16 status_code, u32 peer_capability, bool initiator,
1069                           const u8 *extra_ies, size_t extra_ies_len)
1070 {
1071         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1072         struct ieee80211_local *local = sdata->local;
1073         enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode;
1074         int ret;
1075
1076         /* don't support setup with forced SMPS mode that's not off */
1077         if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1078             smps_mode != IEEE80211_SMPS_OFF) {
1079                 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1080                          smps_mode);
1081                 return -ENOTSUPP;
1082         }
1083
1084         mutex_lock(&local->mtx);
1085
1086         /* we don't support concurrent TDLS peer setups */
1087         if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1088             !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1089                 ret = -EBUSY;
1090                 goto out_unlock;
1091         }
1092
1093         /*
1094          * make sure we have a STA representing the peer so we drop or buffer
1095          * non-TDLS-setup frames to the peer. We can't send other packets
1096          * during setup through the AP path.
1097          * Allow error packets to be sent - sometimes we don't even add a STA
1098          * before failing the setup.
1099          */
1100         if (status_code == 0) {
1101                 rcu_read_lock();
1102                 if (!sta_info_get(sdata, peer)) {
1103                         rcu_read_unlock();
1104                         ret = -ENOLINK;
1105                         goto out_unlock;
1106                 }
1107                 rcu_read_unlock();
1108         }
1109
1110         ieee80211_flush_queues(local, sdata, false);
1111         memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1112         mutex_unlock(&local->mtx);
1113
1114         /* we cannot take the mutex while preparing the setup packet */
1115         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1116                                               dialog_token, status_code,
1117                                               peer_capability, initiator,
1118                                               extra_ies, extra_ies_len, 0,
1119                                               NULL);
1120         if (ret < 0) {
1121                 mutex_lock(&local->mtx);
1122                 eth_zero_addr(sdata->u.mgd.tdls_peer);
1123                 mutex_unlock(&local->mtx);
1124                 return ret;
1125         }
1126
1127         ieee80211_queue_delayed_work(&sdata->local->hw,
1128                                      &sdata->u.mgd.tdls_peer_del_work,
1129                                      TDLS_PEER_SETUP_TIMEOUT);
1130         return 0;
1131
1132 out_unlock:
1133         mutex_unlock(&local->mtx);
1134         return ret;
1135 }
1136
1137 static int
1138 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1139                              const u8 *peer, u8 action_code, u8 dialog_token,
1140                              u16 status_code, u32 peer_capability,
1141                              bool initiator, const u8 *extra_ies,
1142                              size_t extra_ies_len)
1143 {
1144         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1145         struct ieee80211_local *local = sdata->local;
1146         struct sta_info *sta;
1147         int ret;
1148
1149         /*
1150          * No packets can be transmitted to the peer via the AP during setup -
1151          * the STA is set as a TDLS peer, but is not authorized.
1152          * During teardown, we prevent direct transmissions by stopping the
1153          * queues and flushing all direct packets.
1154          */
1155         ieee80211_stop_vif_queues(local, sdata,
1156                                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1157         ieee80211_flush_queues(local, sdata, false);
1158
1159         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1160                                               dialog_token, status_code,
1161                                               peer_capability, initiator,
1162                                               extra_ies, extra_ies_len, 0,
1163                                               NULL);
1164         if (ret < 0)
1165                 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1166                           ret);
1167
1168         /*
1169          * Remove the STA AUTH flag to force further traffic through the AP. If
1170          * the STA was unreachable, it was already removed.
1171          */
1172         rcu_read_lock();
1173         sta = sta_info_get(sdata, peer);
1174         if (sta)
1175                 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1176         rcu_read_unlock();
1177
1178         ieee80211_wake_vif_queues(local, sdata,
1179                                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1180
1181         return 0;
1182 }
1183
1184 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1185                         const u8 *peer, u8 action_code, u8 dialog_token,
1186                         u16 status_code, u32 peer_capability,
1187                         bool initiator, const u8 *extra_ies,
1188                         size_t extra_ies_len)
1189 {
1190         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1191         int ret;
1192
1193         if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1194                 return -ENOTSUPP;
1195
1196         /* make sure we are in managed mode, and associated */
1197         if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1198             !sdata->u.mgd.associated)
1199                 return -EINVAL;
1200
1201         switch (action_code) {
1202         case WLAN_TDLS_SETUP_REQUEST:
1203         case WLAN_TDLS_SETUP_RESPONSE:
1204                 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1205                                                 dialog_token, status_code,
1206                                                 peer_capability, initiator,
1207                                                 extra_ies, extra_ies_len);
1208                 break;
1209         case WLAN_TDLS_TEARDOWN:
1210                 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1211                                                    action_code, dialog_token,
1212                                                    status_code,
1213                                                    peer_capability, initiator,
1214                                                    extra_ies, extra_ies_len);
1215                 break;
1216         case WLAN_TDLS_DISCOVERY_REQUEST:
1217                 /*
1218                  * Protect the discovery so we can hear the TDLS discovery
1219                  * response frame. It is transmitted directly and not buffered
1220                  * by the AP.
1221                  */
1222                 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1223                 /* fall-through */
1224         case WLAN_TDLS_SETUP_CONFIRM:
1225         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1226                 /* no special handling */
1227                 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1228                                                       action_code,
1229                                                       dialog_token,
1230                                                       status_code,
1231                                                       peer_capability,
1232                                                       initiator, extra_ies,
1233                                                       extra_ies_len, 0, NULL);
1234                 break;
1235         default:
1236                 ret = -EOPNOTSUPP;
1237                 break;
1238         }
1239
1240         tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1241                  action_code, peer, ret);
1242         return ret;
1243 }
1244
1245 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1246                                          struct sta_info *sta)
1247 {
1248         struct ieee80211_local *local = sdata->local;
1249         struct ieee80211_chanctx_conf *conf;
1250         struct ieee80211_chanctx *ctx;
1251         enum nl80211_chan_width width;
1252         struct ieee80211_supported_band *sband;
1253
1254         mutex_lock(&local->chanctx_mtx);
1255         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1256                                          lockdep_is_held(&local->chanctx_mtx));
1257         if (conf) {
1258                 width = conf->def.width;
1259                 sband = local->hw.wiphy->bands[conf->def.chan->band];
1260                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1261                 ieee80211_recalc_chanctx_chantype(local, ctx);
1262
1263                 /* if width changed and a peer is given, update its BW */
1264                 if (width != conf->def.width && sta &&
1265                     test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1266                         enum ieee80211_sta_rx_bandwidth bw;
1267
1268                         bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1269                         bw = min(bw, ieee80211_sta_cap_rx_bw(sta));
1270                         if (bw != sta->sta.bandwidth) {
1271                                 sta->sta.bandwidth = bw;
1272                                 rate_control_rate_update(local, sband, sta,
1273                                                          IEEE80211_RC_BW_CHANGED);
1274                                 /*
1275                                  * if a TDLS peer BW was updated, we need to
1276                                  * recalc the chandef width again, to get the
1277                                  * correct chanctx min_def
1278                                  */
1279                                 ieee80211_recalc_chanctx_chantype(local, ctx);
1280                         }
1281                 }
1282
1283         }
1284         mutex_unlock(&local->chanctx_mtx);
1285 }
1286
1287 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1288 {
1289         struct sta_info *sta;
1290         bool result = false;
1291
1292         rcu_read_lock();
1293         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1294                 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1295                     !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1296                     !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1297                     !sta->sta.ht_cap.ht_supported)
1298                         continue;
1299                 result = true;
1300                 break;
1301         }
1302         rcu_read_unlock();
1303
1304         return result;
1305 }
1306
1307 static void
1308 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1309                                    struct sta_info *sta)
1310 {
1311         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1312         bool tdls_ht;
1313         u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1314                          IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1315                          IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1316         u16 opmode;
1317
1318         /* Nothing to do if the BSS connection uses HT */
1319         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
1320                 return;
1321
1322         tdls_ht = (sta && sta->sta.ht_cap.ht_supported) ||
1323                   iee80211_tdls_have_ht_peers(sdata);
1324
1325         opmode = sdata->vif.bss_conf.ht_operation_mode;
1326
1327         if (tdls_ht)
1328                 opmode |= protection;
1329         else
1330                 opmode &= ~protection;
1331
1332         if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1333                 return;
1334
1335         sdata->vif.bss_conf.ht_operation_mode = opmode;
1336         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT);
1337 }
1338
1339 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1340                         const u8 *peer, enum nl80211_tdls_operation oper)
1341 {
1342         struct sta_info *sta;
1343         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1344         struct ieee80211_local *local = sdata->local;
1345         int ret;
1346
1347         if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1348                 return -ENOTSUPP;
1349
1350         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1351                 return -EINVAL;
1352
1353         switch (oper) {
1354         case NL80211_TDLS_ENABLE_LINK:
1355         case NL80211_TDLS_DISABLE_LINK:
1356                 break;
1357         case NL80211_TDLS_TEARDOWN:
1358         case NL80211_TDLS_SETUP:
1359         case NL80211_TDLS_DISCOVERY_REQ:
1360                 /* We don't support in-driver setup/teardown/discovery */
1361                 return -ENOTSUPP;
1362         }
1363
1364         /* protect possible bss_conf changes and avoid concurrency in
1365          * ieee80211_bss_info_change_notify()
1366          */
1367         sdata_lock(sdata);
1368         mutex_lock(&local->mtx);
1369         tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1370
1371         switch (oper) {
1372         case NL80211_TDLS_ENABLE_LINK:
1373                 if (sdata->vif.csa_active) {
1374                         tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1375                         ret = -EBUSY;
1376                         break;
1377                 }
1378
1379                 mutex_lock(&local->sta_mtx);
1380                 sta = sta_info_get(sdata, peer);
1381                 if (!sta) {
1382                         mutex_unlock(&local->sta_mtx);
1383                         ret = -ENOLINK;
1384                         break;
1385                 }
1386
1387                 iee80211_tdls_recalc_chanctx(sdata, sta);
1388                 iee80211_tdls_recalc_ht_protection(sdata, sta);
1389
1390                 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1391                 mutex_unlock(&local->sta_mtx);
1392
1393                 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1394                              !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1395                 ret = 0;
1396                 break;
1397         case NL80211_TDLS_DISABLE_LINK:
1398                 /*
1399                  * The teardown message in ieee80211_tdls_mgmt_teardown() was
1400                  * created while the queues were stopped, so it might still be
1401                  * pending. Before flushing the queues we need to be sure the
1402                  * message is handled by the tasklet handling pending messages,
1403                  * otherwise we might start destroying the station before
1404                  * sending the teardown packet.
1405                  * Note that this only forces the tasklet to flush pendings -
1406                  * not to stop the tasklet from rescheduling itself.
1407                  */
1408                 tasklet_kill(&local->tx_pending_tasklet);
1409                 /* flush a potentially queued teardown packet */
1410                 ieee80211_flush_queues(local, sdata, false);
1411
1412                 ret = sta_info_destroy_addr(sdata, peer);
1413
1414                 mutex_lock(&local->sta_mtx);
1415                 iee80211_tdls_recalc_ht_protection(sdata, NULL);
1416                 mutex_unlock(&local->sta_mtx);
1417
1418                 iee80211_tdls_recalc_chanctx(sdata, NULL);
1419                 break;
1420         default:
1421                 ret = -ENOTSUPP;
1422                 break;
1423         }
1424
1425         if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1426                 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1427                 eth_zero_addr(sdata->u.mgd.tdls_peer);
1428         }
1429
1430         if (ret == 0)
1431                 ieee80211_queue_work(&sdata->local->hw,
1432                                      &sdata->u.mgd.request_smps_work);
1433
1434         mutex_unlock(&local->mtx);
1435         sdata_unlock(sdata);
1436         return ret;
1437 }
1438
1439 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1440                                  enum nl80211_tdls_operation oper,
1441                                  u16 reason_code, gfp_t gfp)
1442 {
1443         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1444
1445         if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1446                 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1447                           oper);
1448                 return;
1449         }
1450
1451         cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1452 }
1453 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1454
1455 static void
1456 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1457 {
1458         struct ieee80211_ch_switch_timing *ch_sw;
1459
1460         *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1461         *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1462
1463         ch_sw = (void *)buf;
1464         ch_sw->switch_time = cpu_to_le16(switch_time);
1465         ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1466 }
1467
1468 /* find switch timing IE in SKB ready for Tx */
1469 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1470 {
1471         struct ieee80211_tdls_data *tf;
1472         const u8 *ie_start;
1473
1474         /*
1475          * Get the offset for the new location of the switch timing IE.
1476          * The SKB network header will now point to the "payload_type"
1477          * element of the TDLS data frame struct.
1478          */
1479         tf = container_of(skb->data + skb_network_offset(skb),
1480                           struct ieee80211_tdls_data, payload_type);
1481         ie_start = tf->u.chan_switch_req.variable;
1482         return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1483                                 skb->len - (ie_start - skb->data));
1484 }
1485
1486 static struct sk_buff *
1487 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1488                               struct cfg80211_chan_def *chandef,
1489                               u32 *ch_sw_tm_ie_offset)
1490 {
1491         struct ieee80211_sub_if_data *sdata = sta->sdata;
1492         u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1493                      2 + sizeof(struct ieee80211_ch_switch_timing)];
1494         int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1495         u8 *pos = extra_ies;
1496         struct sk_buff *skb;
1497
1498         /*
1499          * if chandef points to a wide channel add a Secondary-Channel
1500          * Offset information element
1501          */
1502         if (chandef->width == NL80211_CHAN_WIDTH_40) {
1503                 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1504                 bool ht40plus;
1505
1506                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1507                 *pos++ = sizeof(*sec_chan_ie);
1508                 sec_chan_ie = (void *)pos;
1509
1510                 ht40plus = cfg80211_get_chandef_type(chandef) ==
1511                                                         NL80211_CHAN_HT40PLUS;
1512                 sec_chan_ie->sec_chan_offs = ht40plus ?
1513                                              IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1514                                              IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1515                 pos += sizeof(*sec_chan_ie);
1516
1517                 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1518         }
1519
1520         /* just set the values to 0, this is a template */
1521         iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1522
1523         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1524                                               WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1525                                               0, 0, !sta->sta.tdls_initiator,
1526                                               extra_ies, extra_ies_len,
1527                                               oper_class, chandef);
1528         if (!skb)
1529                 return NULL;
1530
1531         skb = ieee80211_build_data_template(sdata, skb, 0);
1532         if (IS_ERR(skb)) {
1533                 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1534                 return NULL;
1535         }
1536
1537         if (ch_sw_tm_ie_offset) {
1538                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1539
1540                 if (!tm_ie) {
1541                         tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1542                         dev_kfree_skb_any(skb);
1543                         return NULL;
1544                 }
1545
1546                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1547         }
1548
1549         tdls_dbg(sdata,
1550                  "TDLS channel switch request template for %pM ch %d width %d\n",
1551                  sta->sta.addr, chandef->chan->center_freq, chandef->width);
1552         return skb;
1553 }
1554
1555 int
1556 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1557                               const u8 *addr, u8 oper_class,
1558                               struct cfg80211_chan_def *chandef)
1559 {
1560         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1561         struct ieee80211_local *local = sdata->local;
1562         struct sta_info *sta;
1563         struct sk_buff *skb = NULL;
1564         u32 ch_sw_tm_ie;
1565         int ret;
1566
1567         mutex_lock(&local->sta_mtx);
1568         sta = sta_info_get(sdata, addr);
1569         if (!sta) {
1570                 tdls_dbg(sdata,
1571                          "Invalid TDLS peer %pM for channel switch request\n",
1572                          addr);
1573                 ret = -ENOENT;
1574                 goto out;
1575         }
1576
1577         if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1578                 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1579                          addr);
1580                 ret = -ENOTSUPP;
1581                 goto out;
1582         }
1583
1584         skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1585                                             &ch_sw_tm_ie);
1586         if (!skb) {
1587                 ret = -ENOENT;
1588                 goto out;
1589         }
1590
1591         ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1592                                       chandef, skb, ch_sw_tm_ie);
1593         if (!ret)
1594                 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1595
1596 out:
1597         mutex_unlock(&local->sta_mtx);
1598         dev_kfree_skb_any(skb);
1599         return ret;
1600 }
1601
1602 void
1603 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1604                                      struct net_device *dev,
1605                                      const u8 *addr)
1606 {
1607         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1608         struct ieee80211_local *local = sdata->local;
1609         struct sta_info *sta;
1610
1611         mutex_lock(&local->sta_mtx);
1612         sta = sta_info_get(sdata, addr);
1613         if (!sta) {
1614                 tdls_dbg(sdata,
1615                          "Invalid TDLS peer %pM for channel switch cancel\n",
1616                          addr);
1617                 goto out;
1618         }
1619
1620         if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1621                 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1622                          addr);
1623                 goto out;
1624         }
1625
1626         drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1627         clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1628
1629 out:
1630         mutex_unlock(&local->sta_mtx);
1631 }
1632
1633 static struct sk_buff *
1634 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1635                                    u32 *ch_sw_tm_ie_offset)
1636 {
1637         struct ieee80211_sub_if_data *sdata = sta->sdata;
1638         struct sk_buff *skb;
1639         u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1640
1641         /* initial timing are always zero in the template */
1642         iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1643
1644         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1645                                         WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1646                                         0, 0, !sta->sta.tdls_initiator,
1647                                         extra_ies, sizeof(extra_ies), 0, NULL);
1648         if (!skb)
1649                 return NULL;
1650
1651         skb = ieee80211_build_data_template(sdata, skb, 0);
1652         if (IS_ERR(skb)) {
1653                 tdls_dbg(sdata,
1654                          "Failed building TDLS channel switch resp frame\n");
1655                 return NULL;
1656         }
1657
1658         if (ch_sw_tm_ie_offset) {
1659                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1660
1661                 if (!tm_ie) {
1662                         tdls_dbg(sdata,
1663                                  "No switch timing IE in TDLS switch resp\n");
1664                         dev_kfree_skb_any(skb);
1665                         return NULL;
1666                 }
1667
1668                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1669         }
1670
1671         tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1672                  sta->sta.addr);
1673         return skb;
1674 }
1675
1676 static int
1677 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1678                                            struct sk_buff *skb)
1679 {
1680         struct ieee80211_local *local = sdata->local;
1681         struct ieee802_11_elems elems;
1682         struct sta_info *sta;
1683         struct ieee80211_tdls_data *tf = (void *)skb->data;
1684         bool local_initiator;
1685         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1686         int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1687         struct ieee80211_tdls_ch_sw_params params = {};
1688         int ret;
1689
1690         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1691         params.timestamp = rx_status->device_timestamp;
1692
1693         if (skb->len < baselen) {
1694                 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1695                          skb->len);
1696                 return -EINVAL;
1697         }
1698
1699         mutex_lock(&local->sta_mtx);
1700         sta = sta_info_get(sdata, tf->sa);
1701         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1702                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1703                          tf->sa);
1704                 ret = -EINVAL;
1705                 goto out;
1706         }
1707
1708         params.sta = &sta->sta;
1709         params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1710         if (params.status != 0) {
1711                 ret = 0;
1712                 goto call_drv;
1713         }
1714
1715         ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1716                                skb->len - baselen, false, &elems);
1717         if (elems.parse_error) {
1718                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1719                 ret = -EINVAL;
1720                 goto out;
1721         }
1722
1723         if (!elems.ch_sw_timing || !elems.lnk_id) {
1724                 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1725                 ret = -EINVAL;
1726                 goto out;
1727         }
1728
1729         /* validate the initiator is set correctly */
1730         local_initiator =
1731                 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1732         if (local_initiator == sta->sta.tdls_initiator) {
1733                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1734                 ret = -EINVAL;
1735                 goto out;
1736         }
1737
1738         params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1739         params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1740
1741         params.tmpl_skb =
1742                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1743         if (!params.tmpl_skb) {
1744                 ret = -ENOENT;
1745                 goto out;
1746         }
1747
1748         ret = 0;
1749 call_drv:
1750         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1751
1752         tdls_dbg(sdata,
1753                  "TDLS channel switch response received from %pM status %d\n",
1754                  tf->sa, params.status);
1755
1756 out:
1757         mutex_unlock(&local->sta_mtx);
1758         dev_kfree_skb_any(params.tmpl_skb);
1759         return ret;
1760 }
1761
1762 static int
1763 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1764                                           struct sk_buff *skb)
1765 {
1766         struct ieee80211_local *local = sdata->local;
1767         struct ieee802_11_elems elems;
1768         struct cfg80211_chan_def chandef;
1769         struct ieee80211_channel *chan;
1770         enum nl80211_channel_type chan_type;
1771         int freq;
1772         u8 target_channel, oper_class;
1773         bool local_initiator;
1774         struct sta_info *sta;
1775         enum nl80211_band band;
1776         struct ieee80211_tdls_data *tf = (void *)skb->data;
1777         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1778         int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1779         struct ieee80211_tdls_ch_sw_params params = {};
1780         int ret = 0;
1781
1782         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1783         params.timestamp = rx_status->device_timestamp;
1784
1785         if (skb->len < baselen) {
1786                 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1787                          skb->len);
1788                 return -EINVAL;
1789         }
1790
1791         target_channel = tf->u.chan_switch_req.target_channel;
1792         oper_class = tf->u.chan_switch_req.oper_class;
1793
1794         /*
1795          * We can't easily infer the channel band. The operating class is
1796          * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1797          * solution here is to treat channels with number >14 as 5GHz ones,
1798          * and specifically check for the (oper_class, channel) combinations
1799          * where this doesn't hold. These are thankfully unique according to
1800          * IEEE802.11-2012.
1801          * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1802          * valid here.
1803          */
1804         if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1805              oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1806              target_channel < 14)
1807                 band = NL80211_BAND_5GHZ;
1808         else
1809                 band = target_channel < 14 ? NL80211_BAND_2GHZ :
1810                                              NL80211_BAND_5GHZ;
1811
1812         freq = ieee80211_channel_to_frequency(target_channel, band);
1813         if (freq == 0) {
1814                 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1815                          target_channel);
1816                 return -EINVAL;
1817         }
1818
1819         chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1820         if (!chan) {
1821                 tdls_dbg(sdata,
1822                          "Unsupported channel for TDLS chan switch: %d\n",
1823                          target_channel);
1824                 return -EINVAL;
1825         }
1826
1827         ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1828                                skb->len - baselen, false, &elems);
1829         if (elems.parse_error) {
1830                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1831                 return -EINVAL;
1832         }
1833
1834         if (!elems.ch_sw_timing || !elems.lnk_id) {
1835                 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1836                 return -EINVAL;
1837         }
1838
1839         if (!elems.sec_chan_offs) {
1840                 chan_type = NL80211_CHAN_HT20;
1841         } else {
1842                 switch (elems.sec_chan_offs->sec_chan_offs) {
1843                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1844                         chan_type = NL80211_CHAN_HT40PLUS;
1845                         break;
1846                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1847                         chan_type = NL80211_CHAN_HT40MINUS;
1848                         break;
1849                 default:
1850                         chan_type = NL80211_CHAN_HT20;
1851                         break;
1852                 }
1853         }
1854
1855         cfg80211_chandef_create(&chandef, chan, chan_type);
1856
1857         /* we will be active on the TDLS link */
1858         if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1859                                            sdata->wdev.iftype)) {
1860                 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1861                 return -EINVAL;
1862         }
1863
1864         mutex_lock(&local->sta_mtx);
1865         sta = sta_info_get(sdata, tf->sa);
1866         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1867                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1868                          tf->sa);
1869                 ret = -EINVAL;
1870                 goto out;
1871         }
1872
1873         params.sta = &sta->sta;
1874
1875         /* validate the initiator is set correctly */
1876         local_initiator =
1877                 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1878         if (local_initiator == sta->sta.tdls_initiator) {
1879                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1880                 ret = -EINVAL;
1881                 goto out;
1882         }
1883
1884         /* peer should have known better */
1885         if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs &&
1886             elems.sec_chan_offs->sec_chan_offs) {
1887                 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1888                 ret = -ENOTSUPP;
1889                 goto out;
1890         }
1891
1892         params.chandef = &chandef;
1893         params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1894         params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1895
1896         params.tmpl_skb =
1897                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1898                                                    &params.ch_sw_tm_ie);
1899         if (!params.tmpl_skb) {
1900                 ret = -ENOENT;
1901                 goto out;
1902         }
1903
1904         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1905
1906         tdls_dbg(sdata,
1907                  "TDLS ch switch request received from %pM ch %d width %d\n",
1908                  tf->sa, params.chandef->chan->center_freq,
1909                  params.chandef->width);
1910 out:
1911         mutex_unlock(&local->sta_mtx);
1912         dev_kfree_skb_any(params.tmpl_skb);
1913         return ret;
1914 }
1915
1916 static void
1917 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1918                                       struct sk_buff *skb)
1919 {
1920         struct ieee80211_tdls_data *tf = (void *)skb->data;
1921         struct wiphy *wiphy = sdata->local->hw.wiphy;
1922
1923         ASSERT_RTNL();
1924
1925         /* make sure the driver supports it */
1926         if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1927                 return;
1928
1929         /* we want to access the entire packet */
1930         if (skb_linearize(skb))
1931                 return;
1932         /*
1933          * The packet/size was already validated by mac80211 Rx path, only look
1934          * at the action type.
1935          */
1936         switch (tf->action_code) {
1937         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1938                 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1939                 break;
1940         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1941                 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1942                 break;
1943         default:
1944                 WARN_ON_ONCE(1);
1945                 return;
1946         }
1947 }
1948
1949 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1950 {
1951         struct sta_info *sta;
1952         u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1953
1954         rcu_read_lock();
1955         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1956                 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1957                     !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1958                         continue;
1959
1960                 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1961                                             NL80211_TDLS_TEARDOWN, reason,
1962                                             GFP_ATOMIC);
1963         }
1964         rcu_read_unlock();
1965 }
1966
1967 void ieee80211_tdls_chsw_work(struct work_struct *wk)
1968 {
1969         struct ieee80211_local *local =
1970                 container_of(wk, struct ieee80211_local, tdls_chsw_work);
1971         struct ieee80211_sub_if_data *sdata;
1972         struct sk_buff *skb;
1973         struct ieee80211_tdls_data *tf;
1974
1975         rtnl_lock();
1976         while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) {
1977                 tf = (struct ieee80211_tdls_data *)skb->data;
1978                 list_for_each_entry(sdata, &local->interfaces, list) {
1979                         if (!ieee80211_sdata_running(sdata) ||
1980                             sdata->vif.type != NL80211_IFTYPE_STATION ||
1981                             !ether_addr_equal(tf->da, sdata->vif.addr))
1982                                 continue;
1983
1984                         ieee80211_process_tdls_channel_switch(sdata, skb);
1985                         break;
1986                 }
1987
1988                 kfree_skb(skb);
1989         }
1990         rtnl_unlock();
1991 }