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 = (void *)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 = (void *)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 = (void *)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 = (void *)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 = (void *)skb_put(skb, sizeof(*wmm));
 275         memset(wmm, 0, sizeof(*wmm));
 276
 277         wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
 278         wmm->len = sizeof(*wmm) - 2;
 279
 280         wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
 281         wmm->oui[1] = 0x50;
 282         wmm->oui[2] = 0xf2;
 283         wmm->oui_type = 2; /* WME */
 284         wmm->oui_subtype = 1; /* WME param */
 285         wmm->version = 1; /* WME ver */
 286         wmm->qos_info = 0; /* U-APSD not in use */
 287
 288         /*
 289          * Use the EDCA parameters defined for the BSS, or default if the AP
 290          * doesn't support it, as mandated by 802.11-2012 section 10.22.4
 291          */
 292         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 293                 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
 294                 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
 295                                                                txq->acm, i);
 296                 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
 297                 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
 298         }
 299 }
 300
 301 static void
 302 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
 303                                    struct sta_info *sta)
 304 {
 305         /* IEEE802.11ac-2013 Table E-4 */
 306         u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
 307         struct cfg80211_chan_def uc = sta->tdls_chandef;
 308         enum nl80211_chan_width max_width = ieee80211_sta_cap_chan_bw(sta);
 309         int i;
 310
 311         /* only support upgrading non-narrow channels up to 80Mhz */
 312         if (max_width == NL80211_CHAN_WIDTH_5 ||
 313             max_width == NL80211_CHAN_WIDTH_10)
 314                 return;
 315
 316         if (max_width > NL80211_CHAN_WIDTH_80)
 317                 max_width = NL80211_CHAN_WIDTH_80;
 318
 319         if (uc.width >= max_width)
 320                 return;
 321         /*
 322          * Channel usage constrains in the IEEE802.11ac-2013 specification only
 323          * allow expanding a 20MHz channel to 80MHz in a single way. In
 324          * addition, there are no 40MHz allowed channels that are not part of
 325          * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
 326          */
 327         for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
 328                 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
 329                         uc.center_freq1 = centers_80mhz[i];
 330                         uc.center_freq2 = 0;
 331                         uc.width = NL80211_CHAN_WIDTH_80;
 332                         break;
 333                 }
 334
 335         if (!uc.center_freq1)
 336                 return;
 337
 338         /* proceed to downgrade the chandef until usable or the same as AP BW */
 339         while (uc.width > max_width ||
 340                (uc.width > sta->tdls_chandef.width &&
 341                 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
 342                                                sdata->wdev.iftype)))
 343                 ieee80211_chandef_downgrade(&uc);
 344
 345         if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
 346                 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
 347                          sta->tdls_chandef.width, uc.width);
 348
 349                 /*
 350                  * the station is not yet authorized when BW upgrade is done,
 351                  * locking is not required
 352                  */
 353                 sta->tdls_chandef = uc;
 354         }
 355 }
 356
 357 static void
 358 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
 359                                    struct sk_buff *skb, const u8 *peer,
 360                                    u8 action_code, bool initiator,
 361                                    const u8 *extra_ies, size_t extra_ies_len)
 362 {
 363         struct ieee80211_supported_band *sband;
 364         struct ieee80211_local *local = sdata->local;
 365         struct ieee80211_sta_ht_cap ht_cap;
 366         struct ieee80211_sta_vht_cap vht_cap;
 367         struct sta_info *sta = NULL;
 368         size_t offset = 0, noffset;
 369         u8 *pos;
 370
 371         sband = ieee80211_get_sband(sdata);
 372         if (!sband)
 373                 return;
 374
 375         ieee80211_add_srates_ie(sdata, skb, false, sband->band);
 376         ieee80211_add_ext_srates_ie(sdata, skb, false, sband->band);
 377         ieee80211_tdls_add_supp_channels(sdata, skb);
 378
 379         /* add any custom IEs that go before Extended Capabilities */
 380         if (extra_ies_len) {
 381                 static const u8 before_ext_cap[] = {
 382                         WLAN_EID_SUPP_RATES,
 383                         WLAN_EID_COUNTRY,
 384                         WLAN_EID_EXT_SUPP_RATES,
 385                         WLAN_EID_SUPPORTED_CHANNELS,
 386                         WLAN_EID_RSN,
 387                 };
 388                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 389                                              before_ext_cap,
 390                                              ARRAY_SIZE(before_ext_cap),
 391                                              offset);
 392                 pos = skb_put(skb, noffset - offset);
 393                 memcpy(pos, extra_ies + offset, noffset - offset);
 394                 offset = noffset;
 395         }
 396
 397         ieee80211_tdls_add_ext_capab(sdata, skb);
 398
 399         /* add the QoS element if we support it */
 400         if (local->hw.queues >= IEEE80211_NUM_ACS &&
 401             action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
 402                 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
 403
 404         /* add any custom IEs that go before HT capabilities */
 405         if (extra_ies_len) {
 406                 static const u8 before_ht_cap[] = {
 407                         WLAN_EID_SUPP_RATES,
 408                         WLAN_EID_COUNTRY,
 409                         WLAN_EID_EXT_SUPP_RATES,
 410                         WLAN_EID_SUPPORTED_CHANNELS,
 411                         WLAN_EID_RSN,
 412                         WLAN_EID_EXT_CAPABILITY,
 413                         WLAN_EID_QOS_CAPA,
 414                         WLAN_EID_FAST_BSS_TRANSITION,
 415                         WLAN_EID_TIMEOUT_INTERVAL,
 416                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 417                 };
 418                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 419                                              before_ht_cap,
 420                                              ARRAY_SIZE(before_ht_cap),
 421                                              offset);
 422                 pos = skb_put(skb, noffset - offset);
 423                 memcpy(pos, extra_ies + offset, noffset - offset);
 424                 offset = noffset;
 425         }
 426
 427         mutex_lock(&local->sta_mtx);
 428
 429         /* we should have the peer STA if we're already responding */
 430         if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
 431                 sta = sta_info_get(sdata, peer);
 432                 if (WARN_ON_ONCE(!sta)) {
 433                         mutex_unlock(&local->sta_mtx);
 434                         return;
 435                 }
 436
 437                 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
 438         }
 439
 440         ieee80211_tdls_add_oper_classes(sdata, skb);
 441
 442         /*
 443          * with TDLS we can switch channels, and HT-caps are not necessarily
 444          * the same on all bands. The specification limits the setup to a
 445          * single HT-cap, so use the current band for now.
 446          */
 447         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 448
 449         if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 450              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 451             ht_cap.ht_supported) {
 452                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 453
 454                 /* disable SMPS in TDLS initiator */
 455                 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
 456                                 << IEEE80211_HT_CAP_SM_PS_SHIFT;
 457
 458                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 459                 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 460         } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 461                    ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
 462                 /* the peer caps are already intersected with our own */
 463                 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
 464
 465                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 466                 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 467         }
 468
 469         if (ht_cap.ht_supported &&
 470             (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
 471                 ieee80211_tdls_add_bss_coex_ie(skb);
 472
 473         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 474
 475         /* add any custom IEs that go before VHT capabilities */
 476         if (extra_ies_len) {
 477                 static const u8 before_vht_cap[] = {
 478                         WLAN_EID_SUPP_RATES,
 479                         WLAN_EID_COUNTRY,
 480                         WLAN_EID_EXT_SUPP_RATES,
 481                         WLAN_EID_SUPPORTED_CHANNELS,
 482                         WLAN_EID_RSN,
 483                         WLAN_EID_EXT_CAPABILITY,
 484                         WLAN_EID_QOS_CAPA,
 485                         WLAN_EID_FAST_BSS_TRANSITION,
 486                         WLAN_EID_TIMEOUT_INTERVAL,
 487                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 488                         WLAN_EID_MULTI_BAND,
 489                 };
 490                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 491                                              before_vht_cap,
 492                                              ARRAY_SIZE(before_vht_cap),
 493                                              offset);
 494                 pos = skb_put(skb, noffset - offset);
 495                 memcpy(pos, extra_ies + offset, noffset - offset);
 496                 offset = noffset;
 497         }
 498
 499         /* build the VHT-cap similarly to the HT-cap */
 500         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 501         if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 502              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 503             vht_cap.vht_supported) {
 504                 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 505
 506                 /* the AID is present only when VHT is implemented */
 507                 if (action_code == WLAN_TDLS_SETUP_REQUEST)
 508                         ieee80211_tdls_add_aid(sdata, skb);
 509
 510                 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 511                 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 512         } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 513                    vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
 514                 /* the peer caps are already intersected with our own */
 515                 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
 516
 517                 /* the AID is present only when VHT is implemented */
 518                 ieee80211_tdls_add_aid(sdata, skb);
 519
 520                 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 521                 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 522
 523                 /*
 524                  * if both peers support WIDER_BW, we can expand the chandef to
 525                  * a wider compatible one, up to 80MHz
 526                  */
 527                 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 528                         ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 529         }
 530
 531         mutex_unlock(&local->sta_mtx);
 532
 533         /* add any remaining IEs */
 534         if (extra_ies_len) {
 535                 noffset = extra_ies_len;
 536                 pos = skb_put(skb, noffset - offset);
 537                 memcpy(pos, extra_ies + offset, noffset - offset);
 538         }
 539
 540 }
 541
 542 static void
 543 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
 544                                  struct sk_buff *skb, const u8 *peer,
 545                                  bool initiator, const u8 *extra_ies,
 546                                  size_t extra_ies_len)
 547 {
 548         struct ieee80211_local *local = sdata->local;
 549         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 550         size_t offset = 0, noffset;
 551         struct sta_info *sta, *ap_sta;
 552         struct ieee80211_supported_band *sband;
 553         u8 *pos;
 554
 555         sband = ieee80211_get_sband(sdata);
 556         if (!sband)
 557                 return;
 558
 559         mutex_lock(&local->sta_mtx);
 560
 561         sta = sta_info_get(sdata, peer);
 562         ap_sta = sta_info_get(sdata, ifmgd->bssid);
 563         if (WARN_ON_ONCE(!sta || !ap_sta)) {
 564                 mutex_unlock(&local->sta_mtx);
 565                 return;
 566         }
 567
 568         sta->tdls_chandef = sdata->vif.bss_conf.chandef;
 569
 570         /* add any custom IEs that go before the QoS IE */
 571         if (extra_ies_len) {
 572                 static const u8 before_qos[] = {
 573                         WLAN_EID_RSN,
 574                 };
 575                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 576                                              before_qos,
 577                                              ARRAY_SIZE(before_qos),
 578                                              offset);
 579                 pos = skb_put(skb, noffset - offset);
 580                 memcpy(pos, extra_ies + offset, noffset - offset);
 581                 offset = noffset;
 582         }
 583
 584         /* add the QoS param IE if both the peer and we support it */
 585         if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
 586                 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
 587
 588         /* add any custom IEs that go before HT operation */
 589         if (extra_ies_len) {
 590                 static const u8 before_ht_op[] = {
 591                         WLAN_EID_RSN,
 592                         WLAN_EID_QOS_CAPA,
 593                         WLAN_EID_FAST_BSS_TRANSITION,
 594                         WLAN_EID_TIMEOUT_INTERVAL,
 595                 };
 596                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 597                                              before_ht_op,
 598                                              ARRAY_SIZE(before_ht_op),
 599                                              offset);
 600                 pos = skb_put(skb, noffset - offset);
 601                 memcpy(pos, extra_ies + offset, noffset - offset);
 602                 offset = noffset;
 603         }
 604
 605         /*
 606          * if HT support is only added in TDLS, we need an HT-operation IE.
 607          * add the IE as required by IEEE802.11-2012 9.23.3.2.
 608          */
 609         if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
 610                 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
 611                            IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
 612                            IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
 613
 614                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 615                 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
 616                                            &sdata->vif.bss_conf.chandef, prot,
 617                                            true);
 618         }
 619
 620         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 621
 622         /* only include VHT-operation if not on the 2.4GHz band */
 623         if (sband->band != NL80211_BAND_2GHZ &&
 624             sta->sta.vht_cap.vht_supported) {
 625                 /*
 626                  * if both peers support WIDER_BW, we can expand the chandef to
 627                  * a wider compatible one, up to 80MHz
 628                  */
 629                 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 630                         ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 631
 632                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 633                 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
 634                                             &sta->tdls_chandef);
 635         }
 636
 637         mutex_unlock(&local->sta_mtx);
 638
 639         /* add any remaining IEs */
 640         if (extra_ies_len) {
 641                 noffset = extra_ies_len;
 642                 pos = skb_put(skb, noffset - offset);
 643                 memcpy(pos, extra_ies + offset, noffset - offset);
 644         }
 645 }
 646
 647 static void
 648 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
 649                                        struct sk_buff *skb, const u8 *peer,
 650                                        bool initiator, const u8 *extra_ies,
 651                                        size_t extra_ies_len, u8 oper_class,
 652                                        struct cfg80211_chan_def *chandef)
 653 {
 654         struct ieee80211_tdls_data *tf;
 655         size_t offset = 0, noffset;
 656         u8 *pos;
 657
 658         if (WARN_ON_ONCE(!chandef))
 659                 return;
 660
 661         tf = (void *)skb->data;
 662         tf->u.chan_switch_req.target_channel =
 663                 ieee80211_frequency_to_channel(chandef->chan->center_freq);
 664         tf->u.chan_switch_req.oper_class = oper_class;
 665
 666         if (extra_ies_len) {
 667                 static const u8 before_lnkie[] = {
 668                         WLAN_EID_SECONDARY_CHANNEL_OFFSET,
 669                 };
 670                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 671                                              before_lnkie,
 672                                              ARRAY_SIZE(before_lnkie),
 673                                              offset);
 674                 pos = skb_put(skb, noffset - offset);
 675                 memcpy(pos, extra_ies + offset, noffset - offset);
 676                 offset = noffset;
 677         }
 678
 679         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 680
 681         /* add any remaining IEs */
 682         if (extra_ies_len) {
 683                 noffset = extra_ies_len;
 684                 pos = skb_put(skb, noffset - offset);
 685                 memcpy(pos, extra_ies + offset, noffset - offset);
 686         }
 687 }
 688
 689 static void
 690 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
 691                                         struct sk_buff *skb, const u8 *peer,
 692                                         u16 status_code, bool initiator,
 693                                         const u8 *extra_ies,
 694                                         size_t extra_ies_len)
 695 {
 696         if (status_code == 0)
 697                 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 698
 699         if (extra_ies_len)
 700                 memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
 701 }
 702
 703 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
 704                                    struct sk_buff *skb, const u8 *peer,
 705                                    u8 action_code, u16 status_code,
 706                                    bool initiator, const u8 *extra_ies,
 707                                    size_t extra_ies_len, u8 oper_class,
 708                                    struct cfg80211_chan_def *chandef)
 709 {
 710         switch (action_code) {
 711         case WLAN_TDLS_SETUP_REQUEST:
 712         case WLAN_TDLS_SETUP_RESPONSE:
 713         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 714                 if (status_code == 0)
 715                         ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
 716                                                            action_code,
 717                                                            initiator,
 718                                                            extra_ies,
 719                                                            extra_ies_len);
 720                 break;
 721         case WLAN_TDLS_SETUP_CONFIRM:
 722                 if (status_code == 0)
 723                         ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
 724                                                          initiator, extra_ies,
 725                                                          extra_ies_len);
 726                 break;
 727         case WLAN_TDLS_TEARDOWN:
 728         case WLAN_TDLS_DISCOVERY_REQUEST:
 729                 if (extra_ies_len)
 730                         memcpy(skb_put(skb, extra_ies_len), extra_ies,
 731                                extra_ies_len);
 732                 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
 733                         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 734                 break;
 735         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 736                 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
 737                                                        initiator, extra_ies,
 738                                                        extra_ies_len,
 739                                                        oper_class, chandef);
 740                 break;
 741         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 742                 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
 743                                                         status_code,
 744                                                         initiator, extra_ies,
 745                                                         extra_ies_len);
 746                 break;
 747         }
 748
 749 }
 750
 751 static int
 752 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
 753                                const u8 *peer, u8 action_code, u8 dialog_token,
 754                                u16 status_code, struct sk_buff *skb)
 755 {
 756         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 757         struct ieee80211_tdls_data *tf;
 758
 759         tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
 760
 761         memcpy(tf->da, peer, ETH_ALEN);
 762         memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
 763         tf->ether_type = cpu_to_be16(ETH_P_TDLS);
 764         tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
 765
 766         /* network header is after the ethernet header */
 767         skb_set_network_header(skb, ETH_HLEN);
 768
 769         switch (action_code) {
 770         case WLAN_TDLS_SETUP_REQUEST:
 771                 tf->category = WLAN_CATEGORY_TDLS;
 772                 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
 773
 774                 skb_put(skb, sizeof(tf->u.setup_req));
 775                 tf->u.setup_req.dialog_token = dialog_token;
 776                 tf->u.setup_req.capability =
 777                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 778                                                                  status_code));
 779                 break;
 780         case WLAN_TDLS_SETUP_RESPONSE:
 781                 tf->category = WLAN_CATEGORY_TDLS;
 782                 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
 783
 784                 skb_put(skb, sizeof(tf->u.setup_resp));
 785                 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
 786                 tf->u.setup_resp.dialog_token = dialog_token;
 787                 tf->u.setup_resp.capability =
 788                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 789                                                                  status_code));
 790                 break;
 791         case WLAN_TDLS_SETUP_CONFIRM:
 792                 tf->category = WLAN_CATEGORY_TDLS;
 793                 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
 794
 795                 skb_put(skb, sizeof(tf->u.setup_cfm));
 796                 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
 797                 tf->u.setup_cfm.dialog_token = dialog_token;
 798                 break;
 799         case WLAN_TDLS_TEARDOWN:
 800                 tf->category = WLAN_CATEGORY_TDLS;
 801                 tf->action_code = WLAN_TDLS_TEARDOWN;
 802
 803                 skb_put(skb, sizeof(tf->u.teardown));
 804                 tf->u.teardown.reason_code = cpu_to_le16(status_code);
 805                 break;
 806         case WLAN_TDLS_DISCOVERY_REQUEST:
 807                 tf->category = WLAN_CATEGORY_TDLS;
 808                 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
 809
 810                 skb_put(skb, sizeof(tf->u.discover_req));
 811                 tf->u.discover_req.dialog_token = dialog_token;
 812                 break;
 813         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 814                 tf->category = WLAN_CATEGORY_TDLS;
 815                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
 816
 817                 skb_put(skb, sizeof(tf->u.chan_switch_req));
 818                 break;
 819         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 820                 tf->category = WLAN_CATEGORY_TDLS;
 821                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
 822
 823                 skb_put(skb, sizeof(tf->u.chan_switch_resp));
 824                 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
 825                 break;
 826         default:
 827                 return -EINVAL;
 828         }
 829
 830         return 0;
 831 }
 832
 833 static int
 834 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
 835                            const u8 *peer, u8 action_code, u8 dialog_token,
 836                            u16 status_code, struct sk_buff *skb)
 837 {
 838         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 839         struct ieee80211_mgmt *mgmt;
 840
 841         mgmt = (void *)skb_put(skb, 24);
 842         memset(mgmt, 0, 24);
 843         memcpy(mgmt->da, peer, ETH_ALEN);
 844         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 845         memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 846
 847         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 848                                           IEEE80211_STYPE_ACTION);
 849
 850         switch (action_code) {
 851         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 852                 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
 853                 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
 854                 mgmt->u.action.u.tdls_discover_resp.action_code =
 855                         WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
 856                 mgmt->u.action.u.tdls_discover_resp.dialog_token =
 857                         dialog_token;
 858                 mgmt->u.action.u.tdls_discover_resp.capability =
 859                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 860                                                                  status_code));
 861                 break;
 862         default:
 863                 return -EINVAL;
 864         }
 865
 866         return 0;
 867 }
 868
 869 static struct sk_buff *
 870 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
 871                                       const u8 *peer, u8 action_code,
 872                                       u8 dialog_token, u16 status_code,
 873                                       bool initiator, const u8 *extra_ies,
 874                                       size_t extra_ies_len, u8 oper_class,
 875                                       struct cfg80211_chan_def *chandef)
 876 {
 877         struct ieee80211_local *local = sdata->local;
 878         struct sk_buff *skb;
 879         int ret;
 880
 881         skb = netdev_alloc_skb(sdata->dev,
 882                                local->hw.extra_tx_headroom +
 883                                max(sizeof(struct ieee80211_mgmt),
 884                                    sizeof(struct ieee80211_tdls_data)) +
 885                                50 + /* supported rates */
 886                                10 + /* ext capab */
 887                                26 + /* max(WMM-info, WMM-param) */
 888                                2 + max(sizeof(struct ieee80211_ht_cap),
 889                                        sizeof(struct ieee80211_ht_operation)) +
 890                                2 + max(sizeof(struct ieee80211_vht_cap),
 891                                        sizeof(struct ieee80211_vht_operation)) +
 892                                50 + /* supported channels */
 893                                3 + /* 40/20 BSS coex */
 894                                4 + /* AID */
 895                                4 + /* oper classes */
 896                                extra_ies_len +
 897                                sizeof(struct ieee80211_tdls_lnkie));
 898         if (!skb)
 899                 return NULL;
 900
 901         skb_reserve(skb, local->hw.extra_tx_headroom);
 902
 903         switch (action_code) {
 904         case WLAN_TDLS_SETUP_REQUEST:
 905         case WLAN_TDLS_SETUP_RESPONSE:
 906         case WLAN_TDLS_SETUP_CONFIRM:
 907         case WLAN_TDLS_TEARDOWN:
 908         case WLAN_TDLS_DISCOVERY_REQUEST:
 909         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 910         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 911                 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
 912                                                      sdata->dev, peer,
 913                                                      action_code, dialog_token,
 914                                                      status_code, skb);
 915                 break;
 916         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 917                 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
 918                                                  peer, action_code,
 919                                                  dialog_token, status_code,
 920                                                  skb);
 921                 break;
 922         default:
 923                 ret = -ENOTSUPP;
 924                 break;
 925         }
 926
 927         if (ret < 0)
 928                 goto fail;
 929
 930         ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
 931                                initiator, extra_ies, extra_ies_len, oper_class,
 932                                chandef);
 933         return skb;
 934
 935 fail:
 936         dev_kfree_skb(skb);
 937         return NULL;
 938 }
 939
 940 static int
 941 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
 942                                 const u8 *peer, u8 action_code, u8 dialog_token,
 943                                 u16 status_code, u32 peer_capability,
 944                                 bool initiator, const u8 *extra_ies,
 945                                 size_t extra_ies_len, u8 oper_class,
 946                                 struct cfg80211_chan_def *chandef)
 947 {
 948         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 949         struct sk_buff *skb = NULL;
 950         struct sta_info *sta;
 951         u32 flags = 0;
 952         int ret = 0;
 953
 954         rcu_read_lock();
 955         sta = sta_info_get(sdata, peer);
 956
 957         /* infer the initiator if we can, to support old userspace */
 958         switch (action_code) {
 959         case WLAN_TDLS_SETUP_REQUEST:
 960                 if (sta) {
 961                         set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
 962                         sta->sta.tdls_initiator = false;
 963                 }
 964                 /* fall-through */
 965         case WLAN_TDLS_SETUP_CONFIRM:
 966         case WLAN_TDLS_DISCOVERY_REQUEST:
 967                 initiator = true;
 968                 break;
 969         case WLAN_TDLS_SETUP_RESPONSE:
 970                 /*
 971                  * In some testing scenarios, we send a request and response.
 972                  * Make the last packet sent take effect for the initiator
 973                  * value.
 974                  */
 975                 if (sta) {
 976                         clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
 977                         sta->sta.tdls_initiator = true;
 978                 }
 979                 /* fall-through */
 980         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 981                 initiator = false;
 982                 break;
 983         case WLAN_TDLS_TEARDOWN:
 984         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 985         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 986                 /* any value is ok */
 987                 break;
 988         default:
 989                 ret = -ENOTSUPP;
 990                 break;
 991         }
 992
 993         if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
 994                 initiator = true;
 995
 996         rcu_read_unlock();
 997         if (ret < 0)
 998                 goto fail;
 999
1000         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
1001                                                     dialog_token, status_code,
1002                                                     initiator, extra_ies,
1003                                                     extra_ies_len, oper_class,
1004                                                     chandef);
1005         if (!skb) {
1006                 ret = -EINVAL;
1007                 goto fail;
1008         }
1009
1010         if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
1011                 ieee80211_tx_skb(sdata, skb);
1012                 return 0;
1013         }
1014
1015         /*
1016          * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1017          * we should default to AC_VI.
1018          */
1019         switch (action_code) {
1020         case WLAN_TDLS_SETUP_REQUEST:
1021         case WLAN_TDLS_SETUP_RESPONSE:
1022                 skb_set_queue_mapping(skb, IEEE80211_AC_BK);
1023                 skb->priority = 2;
1024                 break;
1025         default:
1026                 skb_set_queue_mapping(skb, IEEE80211_AC_VI);
1027                 skb->priority = 5;
1028                 break;
1029         }
1030
1031         /*
1032          * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1033          * Later, if no ACK is returned from peer, we will re-send the teardown
1034          * packet through the AP.
1035          */
1036         if ((action_code == WLAN_TDLS_TEARDOWN) &&
1037             ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1038                 bool try_resend; /* Should we keep skb for possible resend */
1039
1040                 /* If not sending directly to peer - no point in keeping skb */
1041                 rcu_read_lock();
1042                 sta = sta_info_get(sdata, peer);
1043                 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1044                 rcu_read_unlock();
1045
1046                 spin_lock_bh(&sdata->u.mgd.teardown_lock);
1047                 if (try_resend && !sdata->u.mgd.teardown_skb) {
1048                         /* Mark it as requiring TX status callback  */
1049                         flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1050                                  IEEE80211_TX_INTFL_MLME_CONN_TX;
1051
1052                         /*
1053                          * skb is copied since mac80211 will later set
1054                          * properties that might not be the same as the AP,
1055                          * such as encryption, QoS, addresses, etc.
1056                          *
1057                          * No problem if skb_copy() fails, so no need to check.
1058                          */
1059                         sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1060                         sdata->u.mgd.orig_teardown_skb = skb;
1061                 }
1062                 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1063         }
1064
1065         /* disable bottom halves when entering the Tx path */
1066         local_bh_disable();
1067         __ieee80211_subif_start_xmit(skb, dev, flags);
1068         local_bh_enable();
1069
1070         return ret;
1071
1072 fail:
1073         dev_kfree_skb(skb);
1074         return ret;
1075 }
1076
1077 static int
1078 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1079                           const u8 *peer, u8 action_code, u8 dialog_token,
1080                           u16 status_code, u32 peer_capability, bool initiator,
1081                           const u8 *extra_ies, size_t extra_ies_len)
1082 {
1083         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1084         struct ieee80211_local *local = sdata->local;
1085         enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode;
1086         int ret;
1087
1088         /* don't support setup with forced SMPS mode that's not off */
1089         if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1090             smps_mode != IEEE80211_SMPS_OFF) {
1091                 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1092                          smps_mode);
1093                 return -ENOTSUPP;
1094         }
1095
1096         mutex_lock(&local->mtx);
1097
1098         /* we don't support concurrent TDLS peer setups */
1099         if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1100             !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1101                 ret = -EBUSY;
1102                 goto out_unlock;
1103         }
1104
1105         /*
1106          * make sure we have a STA representing the peer so we drop or buffer
1107          * non-TDLS-setup frames to the peer. We can't send other packets
1108          * during setup through the AP path.
1109          * Allow error packets to be sent - sometimes we don't even add a STA
1110          * before failing the setup.
1111          */
1112         if (status_code == 0) {
1113                 rcu_read_lock();
1114                 if (!sta_info_get(sdata, peer)) {
1115                         rcu_read_unlock();
1116                         ret = -ENOLINK;
1117                         goto out_unlock;
1118                 }
1119                 rcu_read_unlock();
1120         }
1121
1122         ieee80211_flush_queues(local, sdata, false);
1123         memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1124         mutex_unlock(&local->mtx);
1125
1126         /* we cannot take the mutex while preparing the setup packet */
1127         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1128                                               dialog_token, status_code,
1129                                               peer_capability, initiator,
1130                                               extra_ies, extra_ies_len, 0,
1131                                               NULL);
1132         if (ret < 0) {
1133                 mutex_lock(&local->mtx);
1134                 eth_zero_addr(sdata->u.mgd.tdls_peer);
1135                 mutex_unlock(&local->mtx);
1136                 return ret;
1137         }
1138
1139         ieee80211_queue_delayed_work(&sdata->local->hw,
1140                                      &sdata->u.mgd.tdls_peer_del_work,
1141                                      TDLS_PEER_SETUP_TIMEOUT);
1142         return 0;
1143
1144 out_unlock:
1145         mutex_unlock(&local->mtx);
1146         return ret;
1147 }
1148
1149 static int
1150 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1151                              const u8 *peer, u8 action_code, u8 dialog_token,
1152                              u16 status_code, u32 peer_capability,
1153                              bool initiator, const u8 *extra_ies,
1154                              size_t extra_ies_len)
1155 {
1156         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1157         struct ieee80211_local *local = sdata->local;
1158         struct sta_info *sta;
1159         int ret;
1160
1161         /*
1162          * No packets can be transmitted to the peer via the AP during setup -
1163          * the STA is set as a TDLS peer, but is not authorized.
1164          * During teardown, we prevent direct transmissions by stopping the
1165          * queues and flushing all direct packets.
1166          */
1167         ieee80211_stop_vif_queues(local, sdata,
1168                                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1169         ieee80211_flush_queues(local, sdata, false);
1170
1171         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1172                                               dialog_token, status_code,
1173                                               peer_capability, initiator,
1174                                               extra_ies, extra_ies_len, 0,
1175                                               NULL);
1176         if (ret < 0)
1177                 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1178                           ret);
1179
1180         /*
1181          * Remove the STA AUTH flag to force further traffic through the AP. If
1182          * the STA was unreachable, it was already removed.
1183          */
1184         rcu_read_lock();
1185         sta = sta_info_get(sdata, peer);
1186         if (sta)
1187                 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1188         rcu_read_unlock();
1189
1190         ieee80211_wake_vif_queues(local, sdata,
1191                                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1192
1193         return 0;
1194 }
1195
1196 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1197                         const u8 *peer, u8 action_code, u8 dialog_token,
1198                         u16 status_code, u32 peer_capability,
1199                         bool initiator, const u8 *extra_ies,
1200                         size_t extra_ies_len)
1201 {
1202         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1203         int ret;
1204
1205         if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1206                 return -ENOTSUPP;
1207
1208         /* make sure we are in managed mode, and associated */
1209         if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1210             !sdata->u.mgd.associated)
1211                 return -EINVAL;
1212
1213         switch (action_code) {
1214         case WLAN_TDLS_SETUP_REQUEST:
1215         case WLAN_TDLS_SETUP_RESPONSE:
1216                 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1217                                                 dialog_token, status_code,
1218                                                 peer_capability, initiator,
1219                                                 extra_ies, extra_ies_len);
1220                 break;
1221         case WLAN_TDLS_TEARDOWN:
1222                 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1223                                                    action_code, dialog_token,
1224                                                    status_code,
1225                                                    peer_capability, initiator,
1226                                                    extra_ies, extra_ies_len);
1227                 break;
1228         case WLAN_TDLS_DISCOVERY_REQUEST:
1229                 /*
1230                  * Protect the discovery so we can hear the TDLS discovery
1231                  * response frame. It is transmitted directly and not buffered
1232                  * by the AP.
1233                  */
1234                 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1235                 /* fall-through */
1236         case WLAN_TDLS_SETUP_CONFIRM:
1237         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1238                 /* no special handling */
1239                 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1240                                                       action_code,
1241                                                       dialog_token,
1242                                                       status_code,
1243                                                       peer_capability,
1244                                                       initiator, extra_ies,
1245                                                       extra_ies_len, 0, NULL);
1246                 break;
1247         default:
1248                 ret = -EOPNOTSUPP;
1249                 break;
1250         }
1251
1252         tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1253                  action_code, peer, ret);
1254         return ret;
1255 }
1256
1257 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1258                                          struct sta_info *sta)
1259 {
1260         struct ieee80211_local *local = sdata->local;
1261         struct ieee80211_chanctx_conf *conf;
1262         struct ieee80211_chanctx *ctx;
1263         enum nl80211_chan_width width;
1264         struct ieee80211_supported_band *sband;
1265
1266         mutex_lock(&local->chanctx_mtx);
1267         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1268                                          lockdep_is_held(&local->chanctx_mtx));
1269         if (conf) {
1270                 width = conf->def.width;
1271                 sband = local->hw.wiphy->bands[conf->def.chan->band];
1272                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1273                 ieee80211_recalc_chanctx_chantype(local, ctx);
1274
1275                 /* if width changed and a peer is given, update its BW */
1276                 if (width != conf->def.width && sta &&
1277                     test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1278                         enum ieee80211_sta_rx_bandwidth bw;
1279
1280                         bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1281                         bw = min(bw, ieee80211_sta_cap_rx_bw(sta));
1282                         if (bw != sta->sta.bandwidth) {
1283                                 sta->sta.bandwidth = bw;
1284                                 rate_control_rate_update(local, sband, sta,
1285                                                          IEEE80211_RC_BW_CHANGED);
1286                                 /*
1287                                  * if a TDLS peer BW was updated, we need to
1288                                  * recalc the chandef width again, to get the
1289                                  * correct chanctx min_def
1290                                  */
1291                                 ieee80211_recalc_chanctx_chantype(local, ctx);
1292                         }
1293                 }
1294
1295         }
1296         mutex_unlock(&local->chanctx_mtx);
1297 }
1298
1299 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1300 {
1301         struct sta_info *sta;
1302         bool result = false;
1303
1304         rcu_read_lock();
1305         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1306                 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1307                     !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1308                     !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1309                     !sta->sta.ht_cap.ht_supported)
1310                         continue;
1311                 result = true;
1312                 break;
1313         }
1314         rcu_read_unlock();
1315
1316         return result;
1317 }
1318
1319 static void
1320 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1321                                    struct sta_info *sta)
1322 {
1323         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1324         bool tdls_ht;
1325         u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1326                          IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1327                          IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1328         u16 opmode;
1329
1330         /* Nothing to do if the BSS connection uses HT */
1331         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
1332                 return;
1333
1334         tdls_ht = (sta && sta->sta.ht_cap.ht_supported) ||
1335                   iee80211_tdls_have_ht_peers(sdata);
1336
1337         opmode = sdata->vif.bss_conf.ht_operation_mode;
1338
1339         if (tdls_ht)
1340                 opmode |= protection;
1341         else
1342                 opmode &= ~protection;
1343
1344         if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1345                 return;
1346
1347         sdata->vif.bss_conf.ht_operation_mode = opmode;
1348         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT);
1349 }
1350
1351 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1352                         const u8 *peer, enum nl80211_tdls_operation oper)
1353 {
1354         struct sta_info *sta;
1355         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1356         struct ieee80211_local *local = sdata->local;
1357         int ret;
1358
1359         if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1360                 return -ENOTSUPP;
1361
1362         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1363                 return -EINVAL;
1364
1365         switch (oper) {
1366         case NL80211_TDLS_ENABLE_LINK:
1367         case NL80211_TDLS_DISABLE_LINK:
1368                 break;
1369         case NL80211_TDLS_TEARDOWN:
1370         case NL80211_TDLS_SETUP:
1371         case NL80211_TDLS_DISCOVERY_REQ:
1372                 /* We don't support in-driver setup/teardown/discovery */
1373                 return -ENOTSUPP;
1374         }
1375
1376         /* protect possible bss_conf changes and avoid concurrency in
1377          * ieee80211_bss_info_change_notify()
1378          */
1379         sdata_lock(sdata);
1380         mutex_lock(&local->mtx);
1381         tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1382
1383         switch (oper) {
1384         case NL80211_TDLS_ENABLE_LINK:
1385                 if (sdata->vif.csa_active) {
1386                         tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1387                         ret = -EBUSY;
1388                         break;
1389                 }
1390
1391                 mutex_lock(&local->sta_mtx);
1392                 sta = sta_info_get(sdata, peer);
1393                 if (!sta) {
1394                         mutex_unlock(&local->sta_mtx);
1395                         ret = -ENOLINK;
1396                         break;
1397                 }
1398
1399                 iee80211_tdls_recalc_chanctx(sdata, sta);
1400                 iee80211_tdls_recalc_ht_protection(sdata, sta);
1401
1402                 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1403                 mutex_unlock(&local->sta_mtx);
1404
1405                 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1406                              !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1407                 ret = 0;
1408                 break;
1409         case NL80211_TDLS_DISABLE_LINK:
1410                 /*
1411                  * The teardown message in ieee80211_tdls_mgmt_teardown() was
1412                  * created while the queues were stopped, so it might still be
1413                  * pending. Before flushing the queues we need to be sure the
1414                  * message is handled by the tasklet handling pending messages,
1415                  * otherwise we might start destroying the station before
1416                  * sending the teardown packet.
1417                  * Note that this only forces the tasklet to flush pendings -
1418                  * not to stop the tasklet from rescheduling itself.
1419                  */
1420                 tasklet_kill(&local->tx_pending_tasklet);
1421                 /* flush a potentially queued teardown packet */
1422                 ieee80211_flush_queues(local, sdata, false);
1423
1424                 ret = sta_info_destroy_addr(sdata, peer);
1425
1426                 mutex_lock(&local->sta_mtx);
1427                 iee80211_tdls_recalc_ht_protection(sdata, NULL);
1428                 mutex_unlock(&local->sta_mtx);
1429
1430                 iee80211_tdls_recalc_chanctx(sdata, NULL);
1431                 break;
1432         default:
1433                 ret = -ENOTSUPP;
1434                 break;
1435         }
1436
1437         if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1438                 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1439                 eth_zero_addr(sdata->u.mgd.tdls_peer);
1440         }
1441
1442         if (ret == 0)
1443                 ieee80211_queue_work(&sdata->local->hw,
1444                                      &sdata->u.mgd.request_smps_work);
1445
1446         mutex_unlock(&local->mtx);
1447         sdata_unlock(sdata);
1448         return ret;
1449 }
1450
1451 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1452                                  enum nl80211_tdls_operation oper,
1453                                  u16 reason_code, gfp_t gfp)
1454 {
1455         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1456
1457         if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1458                 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1459                           oper);
1460                 return;
1461         }
1462
1463         cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1464 }
1465 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1466
1467 static void
1468 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1469 {
1470         struct ieee80211_ch_switch_timing *ch_sw;
1471
1472         *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1473         *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1474
1475         ch_sw = (void *)buf;
1476         ch_sw->switch_time = cpu_to_le16(switch_time);
1477         ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1478 }
1479
1480 /* find switch timing IE in SKB ready for Tx */
1481 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1482 {
1483         struct ieee80211_tdls_data *tf;
1484         const u8 *ie_start;
1485
1486         /*
1487          * Get the offset for the new location of the switch timing IE.
1488          * The SKB network header will now point to the "payload_type"
1489          * element of the TDLS data frame struct.
1490          */
1491         tf = container_of(skb->data + skb_network_offset(skb),
1492                           struct ieee80211_tdls_data, payload_type);
1493         ie_start = tf->u.chan_switch_req.variable;
1494         return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1495                                 skb->len - (ie_start - skb->data));
1496 }
1497
1498 static struct sk_buff *
1499 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1500                               struct cfg80211_chan_def *chandef,
1501                               u32 *ch_sw_tm_ie_offset)
1502 {
1503         struct ieee80211_sub_if_data *sdata = sta->sdata;
1504         u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1505                      2 + sizeof(struct ieee80211_ch_switch_timing)];
1506         int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1507         u8 *pos = extra_ies;
1508         struct sk_buff *skb;
1509
1510         /*
1511          * if chandef points to a wide channel add a Secondary-Channel
1512          * Offset information element
1513          */
1514         if (chandef->width == NL80211_CHAN_WIDTH_40) {
1515                 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1516                 bool ht40plus;
1517
1518                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1519                 *pos++ = sizeof(*sec_chan_ie);
1520                 sec_chan_ie = (void *)pos;
1521
1522                 ht40plus = cfg80211_get_chandef_type(chandef) ==
1523                                                         NL80211_CHAN_HT40PLUS;
1524                 sec_chan_ie->sec_chan_offs = ht40plus ?
1525                                              IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1526                                              IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1527                 pos += sizeof(*sec_chan_ie);
1528
1529                 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1530         }
1531
1532         /* just set the values to 0, this is a template */
1533         iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1534
1535         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1536                                               WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1537                                               0, 0, !sta->sta.tdls_initiator,
1538                                               extra_ies, extra_ies_len,
1539                                               oper_class, chandef);
1540         if (!skb)
1541                 return NULL;
1542
1543         skb = ieee80211_build_data_template(sdata, skb, 0);
1544         if (IS_ERR(skb)) {
1545                 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1546                 return NULL;
1547         }
1548
1549         if (ch_sw_tm_ie_offset) {
1550                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1551
1552                 if (!tm_ie) {
1553                         tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1554                         dev_kfree_skb_any(skb);
1555                         return NULL;
1556                 }
1557
1558                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1559         }
1560
1561         tdls_dbg(sdata,
1562                  "TDLS channel switch request template for %pM ch %d width %d\n",
1563                  sta->sta.addr, chandef->chan->center_freq, chandef->width);
1564         return skb;
1565 }
1566
1567 int
1568 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1569                               const u8 *addr, u8 oper_class,
1570                               struct cfg80211_chan_def *chandef)
1571 {
1572         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1573         struct ieee80211_local *local = sdata->local;
1574         struct sta_info *sta;
1575         struct sk_buff *skb = NULL;
1576         u32 ch_sw_tm_ie;
1577         int ret;
1578
1579         mutex_lock(&local->sta_mtx);
1580         sta = sta_info_get(sdata, addr);
1581         if (!sta) {
1582                 tdls_dbg(sdata,
1583                          "Invalid TDLS peer %pM for channel switch request\n",
1584                          addr);
1585                 ret = -ENOENT;
1586                 goto out;
1587         }
1588
1589         if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1590                 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1591                          addr);
1592                 ret = -ENOTSUPP;
1593                 goto out;
1594         }
1595
1596         skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1597                                             &ch_sw_tm_ie);
1598         if (!skb) {
1599                 ret = -ENOENT;
1600                 goto out;
1601         }
1602
1603         ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1604                                       chandef, skb, ch_sw_tm_ie);
1605         if (!ret)
1606                 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1607
1608 out:
1609         mutex_unlock(&local->sta_mtx);
1610         dev_kfree_skb_any(skb);
1611         return ret;
1612 }
1613
1614 void
1615 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1616                                      struct net_device *dev,
1617                                      const u8 *addr)
1618 {
1619         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1620         struct ieee80211_local *local = sdata->local;
1621         struct sta_info *sta;
1622
1623         mutex_lock(&local->sta_mtx);
1624         sta = sta_info_get(sdata, addr);
1625         if (!sta) {
1626                 tdls_dbg(sdata,
1627                          "Invalid TDLS peer %pM for channel switch cancel\n",
1628                          addr);
1629                 goto out;
1630         }
1631
1632         if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1633                 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1634                          addr);
1635                 goto out;
1636         }
1637
1638         drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1639         clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1640
1641 out:
1642         mutex_unlock(&local->sta_mtx);
1643 }
1644
1645 static struct sk_buff *
1646 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1647                                    u32 *ch_sw_tm_ie_offset)
1648 {
1649         struct ieee80211_sub_if_data *sdata = sta->sdata;
1650         struct sk_buff *skb;
1651         u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1652
1653         /* initial timing are always zero in the template */
1654         iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1655
1656         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1657                                         WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1658                                         0, 0, !sta->sta.tdls_initiator,
1659                                         extra_ies, sizeof(extra_ies), 0, NULL);
1660         if (!skb)
1661                 return NULL;
1662
1663         skb = ieee80211_build_data_template(sdata, skb, 0);
1664         if (IS_ERR(skb)) {
1665                 tdls_dbg(sdata,
1666                          "Failed building TDLS channel switch resp frame\n");
1667                 return NULL;
1668         }
1669
1670         if (ch_sw_tm_ie_offset) {
1671                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1672
1673                 if (!tm_ie) {
1674                         tdls_dbg(sdata,
1675                                  "No switch timing IE in TDLS switch resp\n");
1676                         dev_kfree_skb_any(skb);
1677                         return NULL;
1678                 }
1679
1680                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1681         }
1682
1683         tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1684                  sta->sta.addr);
1685         return skb;
1686 }
1687
1688 static int
1689 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1690                                            struct sk_buff *skb)
1691 {
1692         struct ieee80211_local *local = sdata->local;
1693         struct ieee802_11_elems elems;
1694         struct sta_info *sta;
1695         struct ieee80211_tdls_data *tf = (void *)skb->data;
1696         bool local_initiator;
1697         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1698         int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1699         struct ieee80211_tdls_ch_sw_params params = {};
1700         int ret;
1701
1702         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1703         params.timestamp = rx_status->device_timestamp;
1704
1705         if (skb->len < baselen) {
1706                 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1707                          skb->len);
1708                 return -EINVAL;
1709         }
1710
1711         mutex_lock(&local->sta_mtx);
1712         sta = sta_info_get(sdata, tf->sa);
1713         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1714                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1715                          tf->sa);
1716                 ret = -EINVAL;
1717                 goto out;
1718         }
1719
1720         params.sta = &sta->sta;
1721         params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1722         if (params.status != 0) {
1723                 ret = 0;
1724                 goto call_drv;
1725         }
1726
1727         ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1728                                skb->len - baselen, false, &elems);
1729         if (elems.parse_error) {
1730                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1731                 ret = -EINVAL;
1732                 goto out;
1733         }
1734
1735         if (!elems.ch_sw_timing || !elems.lnk_id) {
1736                 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1737                 ret = -EINVAL;
1738                 goto out;
1739         }
1740
1741         /* validate the initiator is set correctly */
1742         local_initiator =
1743                 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1744         if (local_initiator == sta->sta.tdls_initiator) {
1745                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1746                 ret = -EINVAL;
1747                 goto out;
1748         }
1749
1750         params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1751         params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1752
1753         params.tmpl_skb =
1754                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1755         if (!params.tmpl_skb) {
1756                 ret = -ENOENT;
1757                 goto out;
1758         }
1759
1760         ret = 0;
1761 call_drv:
1762         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1763
1764         tdls_dbg(sdata,
1765                  "TDLS channel switch response received from %pM status %d\n",
1766                  tf->sa, params.status);
1767
1768 out:
1769         mutex_unlock(&local->sta_mtx);
1770         dev_kfree_skb_any(params.tmpl_skb);
1771         return ret;
1772 }
1773
1774 static int
1775 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1776                                           struct sk_buff *skb)
1777 {
1778         struct ieee80211_local *local = sdata->local;
1779         struct ieee802_11_elems elems;
1780         struct cfg80211_chan_def chandef;
1781         struct ieee80211_channel *chan;
1782         enum nl80211_channel_type chan_type;
1783         int freq;
1784         u8 target_channel, oper_class;
1785         bool local_initiator;
1786         struct sta_info *sta;
1787         enum nl80211_band band;
1788         struct ieee80211_tdls_data *tf = (void *)skb->data;
1789         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1790         int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1791         struct ieee80211_tdls_ch_sw_params params = {};
1792         int ret = 0;
1793
1794         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1795         params.timestamp = rx_status->device_timestamp;
1796
1797         if (skb->len < baselen) {
1798                 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1799                          skb->len);
1800                 return -EINVAL;
1801         }
1802
1803         target_channel = tf->u.chan_switch_req.target_channel;
1804         oper_class = tf->u.chan_switch_req.oper_class;
1805
1806         /*
1807          * We can't easily infer the channel band. The operating class is
1808          * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1809          * solution here is to treat channels with number >14 as 5GHz ones,
1810          * and specifically check for the (oper_class, channel) combinations
1811          * where this doesn't hold. These are thankfully unique according to
1812          * IEEE802.11-2012.
1813          * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1814          * valid here.
1815          */
1816         if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1817              oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1818              target_channel < 14)
1819                 band = NL80211_BAND_5GHZ;
1820         else
1821                 band = target_channel < 14 ? NL80211_BAND_2GHZ :
1822                                              NL80211_BAND_5GHZ;
1823
1824         freq = ieee80211_channel_to_frequency(target_channel, band);
1825         if (freq == 0) {
1826                 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1827                          target_channel);
1828                 return -EINVAL;
1829         }
1830
1831         chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1832         if (!chan) {
1833                 tdls_dbg(sdata,
1834                          "Unsupported channel for TDLS chan switch: %d\n",
1835                          target_channel);
1836                 return -EINVAL;
1837         }
1838
1839         ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1840                                skb->len - baselen, false, &elems);
1841         if (elems.parse_error) {
1842                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1843                 return -EINVAL;
1844         }
1845
1846         if (!elems.ch_sw_timing || !elems.lnk_id) {
1847                 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1848                 return -EINVAL;
1849         }
1850
1851         if (!elems.sec_chan_offs) {
1852                 chan_type = NL80211_CHAN_HT20;
1853         } else {
1854                 switch (elems.sec_chan_offs->sec_chan_offs) {
1855                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1856                         chan_type = NL80211_CHAN_HT40PLUS;
1857                         break;
1858                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1859                         chan_type = NL80211_CHAN_HT40MINUS;
1860                         break;
1861                 default:
1862                         chan_type = NL80211_CHAN_HT20;
1863                         break;
1864                 }
1865         }
1866
1867         cfg80211_chandef_create(&chandef, chan, chan_type);
1868
1869         /* we will be active on the TDLS link */
1870         if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1871                                            sdata->wdev.iftype)) {
1872                 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1873                 return -EINVAL;
1874         }
1875
1876         mutex_lock(&local->sta_mtx);
1877         sta = sta_info_get(sdata, tf->sa);
1878         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1879                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1880                          tf->sa);
1881                 ret = -EINVAL;
1882                 goto out;
1883         }
1884
1885         params.sta = &sta->sta;
1886
1887         /* validate the initiator is set correctly */
1888         local_initiator =
1889                 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1890         if (local_initiator == sta->sta.tdls_initiator) {
1891                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1892                 ret = -EINVAL;
1893                 goto out;
1894         }
1895
1896         /* peer should have known better */
1897         if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs &&
1898             elems.sec_chan_offs->sec_chan_offs) {
1899                 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1900                 ret = -ENOTSUPP;
1901                 goto out;
1902         }
1903
1904         params.chandef = &chandef;
1905         params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1906         params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1907
1908         params.tmpl_skb =
1909                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1910                                                    &params.ch_sw_tm_ie);
1911         if (!params.tmpl_skb) {
1912                 ret = -ENOENT;
1913                 goto out;
1914         }
1915
1916         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1917
1918         tdls_dbg(sdata,
1919                  "TDLS ch switch request received from %pM ch %d width %d\n",
1920                  tf->sa, params.chandef->chan->center_freq,
1921                  params.chandef->width);
1922 out:
1923         mutex_unlock(&local->sta_mtx);
1924         dev_kfree_skb_any(params.tmpl_skb);
1925         return ret;
1926 }
1927
1928 static void
1929 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1930                                       struct sk_buff *skb)
1931 {
1932         struct ieee80211_tdls_data *tf = (void *)skb->data;
1933         struct wiphy *wiphy = sdata->local->hw.wiphy;
1934
1935         ASSERT_RTNL();
1936
1937         /* make sure the driver supports it */
1938         if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1939                 return;
1940
1941         /* we want to access the entire packet */
1942         if (skb_linearize(skb))
1943                 return;
1944         /*
1945          * The packet/size was already validated by mac80211 Rx path, only look
1946          * at the action type.
1947          */
1948         switch (tf->action_code) {
1949         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1950                 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1951                 break;
1952         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1953                 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1954                 break;
1955         default:
1956                 WARN_ON_ONCE(1);
1957                 return;
1958         }
1959 }
1960
1961 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1962 {
1963         struct sta_info *sta;
1964         u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1965
1966         rcu_read_lock();
1967         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1968                 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1969                     !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1970                         continue;
1971
1972                 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1973                                             NL80211_TDLS_TEARDOWN, reason,
1974                                             GFP_ATOMIC);
1975         }
1976         rcu_read_unlock();
1977 }
1978
1979 void ieee80211_tdls_chsw_work(struct work_struct *wk)
1980 {
1981         struct ieee80211_local *local =
1982                 container_of(wk, struct ieee80211_local, tdls_chsw_work);
1983         struct ieee80211_sub_if_data *sdata;
1984         struct sk_buff *skb;
1985         struct ieee80211_tdls_data *tf;
1986
1987         rtnl_lock();
1988         while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) {
1989                 tf = (struct ieee80211_tdls_data *)skb->data;
1990                 list_for_each_entry(sdata, &local->interfaces, list) {
1991                         if (!ieee80211_sdata_running(sdata) ||
1992                             sdata->vif.type != NL80211_IFTYPE_STATION ||
1993                             !ether_addr_equal(tf->da, sdata->vif.addr))
1994                                 continue;
1995
1996                         ieee80211_process_tdls_channel_switch(sdata, skb);
1997                         break;
1998                 }
1999
2000                 kfree_skb(skb);
2001         }
2002         rtnl_unlock();
2003 }