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 #include "wme.h"
  20
  21 /* give usermode some time for retries in setting up the TDLS session */
  22 #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ)
  23
  24 void ieee80211_tdls_peer_del_work(struct work_struct *wk)
  25 {
  26         struct ieee80211_sub_if_data *sdata;
  27         struct ieee80211_local *local;
  28
  29         sdata = container_of(wk, struct ieee80211_sub_if_data,
  30                              u.mgd.tdls_peer_del_work.work);
  31         local = sdata->local;
  32
  33         mutex_lock(&local->mtx);
  34         if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
  35                 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
  36                 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
  37                 eth_zero_addr(sdata->u.mgd.tdls_peer);
  38         }
  39         mutex_unlock(&local->mtx);
  40 }
  41
  42 static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata,
  43                                          struct sk_buff *skb)
  44 {
  45         struct ieee80211_local *local = sdata->local;
  46         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  47         bool chan_switch = local->hw.wiphy->features &
  48                            NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
  49         bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
  50                           !ifmgd->tdls_wider_bw_prohibited;
  51         struct ieee80211_supported_band *sband = ieee80211_get_sband(sdata);
  52         bool vht = sband && sband->vht_cap.vht_supported;
  53         u8 *pos = skb_put(skb, 10);
  54
  55         *pos++ = WLAN_EID_EXT_CAPABILITY;
  56         *pos++ = 8; /* len */
  57         *pos++ = 0x0;
  58         *pos++ = 0x0;
  59         *pos++ = 0x0;
  60         *pos++ = chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0;
  61         *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
  62         *pos++ = 0;
  63         *pos++ = 0;
  64         *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
  65 }
  66
  67 static u8
  68 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
  69                            struct sk_buff *skb, u16 start, u16 end,
  70                            u16 spacing)
  71 {
  72         u8 subband_cnt = 0, ch_cnt = 0;
  73         struct ieee80211_channel *ch;
  74         struct cfg80211_chan_def chandef;
  75         int i, subband_start;
  76         struct wiphy *wiphy = sdata->local->hw.wiphy;
  77
  78         for (i = start; i <= end; i += spacing) {
  79                 if (!ch_cnt)
  80                         subband_start = i;
  81
  82                 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
  83                 if (ch) {
  84                         /* we will be active on the channel */
  85                         cfg80211_chandef_create(&chandef, ch,
  86                                                 NL80211_CHAN_NO_HT);
  87                         if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
  88                                                           sdata->wdev.iftype)) {
  89                                 ch_cnt++;
  90                                 /*
  91                                  * check if the next channel is also part of
  92                                  * this allowed range
  93                                  */
  94                                 continue;
  95                         }
  96                 }
  97
  98                 /*
  99                  * we've reached the end of a range, with allowed channels
 100                  * found
 101                  */
 102                 if (ch_cnt) {
 103                         u8 *pos = skb_put(skb, 2);
 104                         *pos++ = ieee80211_frequency_to_channel(subband_start);
 105                         *pos++ = ch_cnt;
 106
 107                         subband_cnt++;
 108                         ch_cnt = 0;
 109                 }
 110         }
 111
 112         /* all channels in the requested range are allowed - add them here */
 113         if (ch_cnt) {
 114                 u8 *pos = skb_put(skb, 2);
 115                 *pos++ = ieee80211_frequency_to_channel(subband_start);
 116                 *pos++ = ch_cnt;
 117
 118                 subband_cnt++;
 119         }
 120
 121         return subband_cnt;
 122 }
 123
 124 static void
 125 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
 126                                  struct sk_buff *skb)
 127 {
 128         /*
 129          * Add possible channels for TDLS. These are channels that are allowed
 130          * to be active.
 131          */
 132         u8 subband_cnt;
 133         u8 *pos = skb_put(skb, 2);
 134
 135         *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 136
 137         /*
 138          * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
 139          * this doesn't happen in real world scenarios.
 140          */
 141
 142         /* 2GHz, with 5MHz spacing */
 143         subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
 144
 145         /* 5GHz, with 20MHz spacing */
 146         subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
 147
 148         /* length */
 149         *pos = 2 * subband_cnt;
 150 }
 151
 152 static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata,
 153                                             struct sk_buff *skb)
 154 {
 155         u8 *pos;
 156         u8 op_class;
 157
 158         if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef,
 159                                                   &op_class))
 160                 return;
 161
 162         pos = skb_put(skb, 4);
 163         *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
 164         *pos++ = 2; /* len */
 165
 166         *pos++ = op_class;
 167         *pos++ = op_class; /* give current operating class as alternate too */
 168 }
 169
 170 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
 171 {
 172         u8 *pos = skb_put(skb, 3);
 173
 174         *pos++ = WLAN_EID_BSS_COEX_2040;
 175         *pos++ = 1; /* len */
 176
 177         *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
 178 }
 179
 180 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
 181                                         u16 status_code)
 182 {
 183         struct ieee80211_supported_band *sband;
 184
 185         /* The capability will be 0 when sending a failure code */
 186         if (status_code != 0)
 187                 return 0;
 188
 189         sband = ieee80211_get_sband(sdata);
 190         if (sband && sband->band == NL80211_BAND_2GHZ) {
 191                 return WLAN_CAPABILITY_SHORT_SLOT_TIME |
 192                        WLAN_CAPABILITY_SHORT_PREAMBLE;
 193         }
 194
 195         return 0;
 196 }
 197
 198 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
 199                                        struct sk_buff *skb, const u8 *peer,
 200                                        bool initiator)
 201 {
 202         struct ieee80211_tdls_lnkie *lnkid;
 203         const u8 *init_addr, *rsp_addr;
 204
 205         if (initiator) {
 206                 init_addr = sdata->vif.addr;
 207                 rsp_addr = peer;
 208         } else {
 209                 init_addr = peer;
 210                 rsp_addr = sdata->vif.addr;
 211         }
 212
 213         lnkid = skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
 214
 215         lnkid->ie_type = WLAN_EID_LINK_ID;
 216         lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
 217
 218         memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 219         memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
 220         memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
 221 }
 222
 223 static void
 224 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 225 {
 226         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 227         u8 *pos = skb_put(skb, 4);
 228
 229         *pos++ = WLAN_EID_AID;
 230         *pos++ = 2; /* len */
 231         put_unaligned_le16(ifmgd->aid, pos);
 232 }
 233
 234 /* translate numbering in the WMM parameter IE to the mac80211 notation */
 235 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
 236 {
 237         switch (ac) {
 238         default:
 239                 WARN_ON_ONCE(1);
 240         case 0:
 241                 return IEEE80211_AC_BE;
 242         case 1:
 243                 return IEEE80211_AC_BK;
 244         case 2:
 245                 return IEEE80211_AC_VI;
 246         case 3:
 247                 return IEEE80211_AC_VO;
 248         }
 249 }
 250
 251 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
 252 {
 253         u8 ret;
 254
 255         ret = aifsn & 0x0f;
 256         if (acm)
 257                 ret |= 0x10;
 258         ret |= (aci << 5) & 0x60;
 259         return ret;
 260 }
 261
 262 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
 263 {
 264         return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
 265                ((ilog2(cw_max + 1) << 0x4) & 0xf0);
 266 }
 267
 268 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
 269                                             struct sk_buff *skb)
 270 {
 271         struct ieee80211_wmm_param_ie *wmm;
 272         struct ieee80211_tx_queue_params *txq;
 273         int i;
 274
 275         wmm = skb_put_zero(skb, 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                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 393                 offset = noffset;
 394         }
 395
 396         ieee80211_tdls_add_ext_capab(sdata, skb);
 397
 398         /* add the QoS element if we support it */
 399         if (local->hw.queues >= IEEE80211_NUM_ACS &&
 400             action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
 401                 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
 402
 403         /* add any custom IEs that go before HT capabilities */
 404         if (extra_ies_len) {
 405                 static const u8 before_ht_cap[] = {
 406                         WLAN_EID_SUPP_RATES,
 407                         WLAN_EID_COUNTRY,
 408                         WLAN_EID_EXT_SUPP_RATES,
 409                         WLAN_EID_SUPPORTED_CHANNELS,
 410                         WLAN_EID_RSN,
 411                         WLAN_EID_EXT_CAPABILITY,
 412                         WLAN_EID_QOS_CAPA,
 413                         WLAN_EID_FAST_BSS_TRANSITION,
 414                         WLAN_EID_TIMEOUT_INTERVAL,
 415                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 416                 };
 417                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 418                                              before_ht_cap,
 419                                              ARRAY_SIZE(before_ht_cap),
 420                                              offset);
 421                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 422                 offset = noffset;
 423         }
 424
 425         mutex_lock(&local->sta_mtx);
 426
 427         /* we should have the peer STA if we're already responding */
 428         if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
 429                 sta = sta_info_get(sdata, peer);
 430                 if (WARN_ON_ONCE(!sta)) {
 431                         mutex_unlock(&local->sta_mtx);
 432                         return;
 433                 }
 434
 435                 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
 436         }
 437
 438         ieee80211_tdls_add_oper_classes(sdata, skb);
 439
 440         /*
 441          * with TDLS we can switch channels, and HT-caps are not necessarily
 442          * the same on all bands. The specification limits the setup to a
 443          * single HT-cap, so use the current band for now.
 444          */
 445         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 446
 447         if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 448              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 449             ht_cap.ht_supported) {
 450                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 451
 452                 /* disable SMPS in TDLS initiator */
 453                 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
 454                                 << IEEE80211_HT_CAP_SM_PS_SHIFT;
 455
 456                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 457                 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 458         } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 459                    ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
 460                 /* the peer caps are already intersected with our own */
 461                 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
 462
 463                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 464                 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 465         }
 466
 467         if (ht_cap.ht_supported &&
 468             (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
 469                 ieee80211_tdls_add_bss_coex_ie(skb);
 470
 471         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 472
 473         /* add any custom IEs that go before VHT capabilities */
 474         if (extra_ies_len) {
 475                 static const u8 before_vht_cap[] = {
 476                         WLAN_EID_SUPP_RATES,
 477                         WLAN_EID_COUNTRY,
 478                         WLAN_EID_EXT_SUPP_RATES,
 479                         WLAN_EID_SUPPORTED_CHANNELS,
 480                         WLAN_EID_RSN,
 481                         WLAN_EID_EXT_CAPABILITY,
 482                         WLAN_EID_QOS_CAPA,
 483                         WLAN_EID_FAST_BSS_TRANSITION,
 484                         WLAN_EID_TIMEOUT_INTERVAL,
 485                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 486                         WLAN_EID_MULTI_BAND,
 487                 };
 488                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 489                                              before_vht_cap,
 490                                              ARRAY_SIZE(before_vht_cap),
 491                                              offset);
 492                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 493                 offset = noffset;
 494         }
 495
 496         /* build the VHT-cap similarly to the HT-cap */
 497         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 498         if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 499              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 500             vht_cap.vht_supported) {
 501                 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 502
 503                 /* the AID is present only when VHT is implemented */
 504                 if (action_code == WLAN_TDLS_SETUP_REQUEST)
 505                         ieee80211_tdls_add_aid(sdata, skb);
 506
 507                 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 508                 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 509         } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 510                    vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
 511                 /* the peer caps are already intersected with our own */
 512                 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
 513
 514                 /* the AID is present only when VHT is implemented */
 515                 ieee80211_tdls_add_aid(sdata, skb);
 516
 517                 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 518                 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 519
 520                 /*
 521                  * if both peers support WIDER_BW, we can expand the chandef to
 522                  * a wider compatible one, up to 80MHz
 523                  */
 524                 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 525                         ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 526         }
 527
 528         mutex_unlock(&local->sta_mtx);
 529
 530         /* add any remaining IEs */
 531         if (extra_ies_len) {
 532                 noffset = extra_ies_len;
 533                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 534         }
 535
 536 }
 537
 538 static void
 539 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
 540                                  struct sk_buff *skb, const u8 *peer,
 541                                  bool initiator, const u8 *extra_ies,
 542                                  size_t extra_ies_len)
 543 {
 544         struct ieee80211_local *local = sdata->local;
 545         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 546         size_t offset = 0, noffset;
 547         struct sta_info *sta, *ap_sta;
 548         struct ieee80211_supported_band *sband;
 549         u8 *pos;
 550
 551         sband = ieee80211_get_sband(sdata);
 552         if (!sband)
 553                 return;
 554
 555         mutex_lock(&local->sta_mtx);
 556
 557         sta = sta_info_get(sdata, peer);
 558         ap_sta = sta_info_get(sdata, ifmgd->bssid);
 559         if (WARN_ON_ONCE(!sta || !ap_sta)) {
 560                 mutex_unlock(&local->sta_mtx);
 561                 return;
 562         }
 563
 564         sta->tdls_chandef = sdata->vif.bss_conf.chandef;
 565
 566         /* add any custom IEs that go before the QoS IE */
 567         if (extra_ies_len) {
 568                 static const u8 before_qos[] = {
 569                         WLAN_EID_RSN,
 570                 };
 571                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 572                                              before_qos,
 573                                              ARRAY_SIZE(before_qos),
 574                                              offset);
 575                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 576                 offset = noffset;
 577         }
 578
 579         /* add the QoS param IE if both the peer and we support it */
 580         if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
 581                 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
 582
 583         /* add any custom IEs that go before HT operation */
 584         if (extra_ies_len) {
 585                 static const u8 before_ht_op[] = {
 586                         WLAN_EID_RSN,
 587                         WLAN_EID_QOS_CAPA,
 588                         WLAN_EID_FAST_BSS_TRANSITION,
 589                         WLAN_EID_TIMEOUT_INTERVAL,
 590                 };
 591                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 592                                              before_ht_op,
 593                                              ARRAY_SIZE(before_ht_op),
 594                                              offset);
 595                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 596                 offset = noffset;
 597         }
 598
 599         /*
 600          * if HT support is only added in TDLS, we need an HT-operation IE.
 601          * add the IE as required by IEEE802.11-2012 9.23.3.2.
 602          */
 603         if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
 604                 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
 605                            IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
 606                            IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
 607
 608                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 609                 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
 610                                            &sdata->vif.bss_conf.chandef, prot,
 611                                            true);
 612         }
 613
 614         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 615
 616         /* only include VHT-operation if not on the 2.4GHz band */
 617         if (sband->band != NL80211_BAND_2GHZ &&
 618             sta->sta.vht_cap.vht_supported) {
 619                 /*
 620                  * if both peers support WIDER_BW, we can expand the chandef to
 621                  * a wider compatible one, up to 80MHz
 622                  */
 623                 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 624                         ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 625
 626                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 627                 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
 628                                             &sta->tdls_chandef);
 629         }
 630
 631         mutex_unlock(&local->sta_mtx);
 632
 633         /* add any remaining IEs */
 634         if (extra_ies_len) {
 635                 noffset = extra_ies_len;
 636                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 637         }
 638 }
 639
 640 static void
 641 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
 642                                        struct sk_buff *skb, const u8 *peer,
 643                                        bool initiator, const u8 *extra_ies,
 644                                        size_t extra_ies_len, u8 oper_class,
 645                                        struct cfg80211_chan_def *chandef)
 646 {
 647         struct ieee80211_tdls_data *tf;
 648         size_t offset = 0, noffset;
 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                 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                 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->priority = 256 + 2;
1011                 break;
1012         default:
1013                 skb->priority = 256 + 5;
1014                 break;
1015         }
1016         skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, skb));
1017
1018         /*
1019          * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1020          * Later, if no ACK is returned from peer, we will re-send the teardown
1021          * packet through the AP.
1022          */
1023         if ((action_code == WLAN_TDLS_TEARDOWN) &&
1024             ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1025                 bool try_resend; /* Should we keep skb for possible resend */
1026
1027                 /* If not sending directly to peer - no point in keeping skb */
1028                 rcu_read_lock();
1029                 sta = sta_info_get(sdata, peer);
1030                 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1031                 rcu_read_unlock();
1032
1033                 spin_lock_bh(&sdata->u.mgd.teardown_lock);
1034                 if (try_resend && !sdata->u.mgd.teardown_skb) {
1035                         /* Mark it as requiring TX status callback  */
1036                         flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1037                                  IEEE80211_TX_INTFL_MLME_CONN_TX;
1038
1039                         /*
1040                          * skb is copied since mac80211 will later set
1041                          * properties that might not be the same as the AP,
1042                          * such as encryption, QoS, addresses, etc.
1043                          *
1044                          * No problem if skb_copy() fails, so no need to check.
1045                          */
1046                         sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1047                         sdata->u.mgd.orig_teardown_skb = skb;
1048                 }
1049                 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1050         }
1051
1052         /* disable bottom halves when entering the Tx path */
1053         local_bh_disable();
1054         __ieee80211_subif_start_xmit(skb, dev, flags);
1055         local_bh_enable();
1056
1057         return ret;
1058
1059 fail:
1060         dev_kfree_skb(skb);
1061         return ret;
1062 }
1063
1064 static int
1065 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1066                           const u8 *peer, u8 action_code, u8 dialog_token,
1067                           u16 status_code, u32 peer_capability, bool initiator,
1068                           const u8 *extra_ies, size_t extra_ies_len)
1069 {
1070         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1071         struct ieee80211_local *local = sdata->local;
1072         enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode;
1073         int ret;
1074
1075         /* don't support setup with forced SMPS mode that's not off */
1076         if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1077             smps_mode != IEEE80211_SMPS_OFF) {
1078                 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1079                          smps_mode);
1080                 return -ENOTSUPP;
1081         }
1082
1083         mutex_lock(&local->mtx);
1084
1085         /* we don't support concurrent TDLS peer setups */
1086         if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1087             !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1088                 ret = -EBUSY;
1089                 goto out_unlock;
1090         }
1091
1092         /*
1093          * make sure we have a STA representing the peer so we drop or buffer
1094          * non-TDLS-setup frames to the peer. We can't send other packets
1095          * during setup through the AP path.
1096          * Allow error packets to be sent - sometimes we don't even add a STA
1097          * before failing the setup.
1098          */
1099         if (status_code == 0) {
1100                 rcu_read_lock();
1101                 if (!sta_info_get(sdata, peer)) {
1102                         rcu_read_unlock();
1103                         ret = -ENOLINK;
1104                         goto out_unlock;
1105                 }
1106                 rcu_read_unlock();
1107         }
1108
1109         ieee80211_flush_queues(local, sdata, false);
1110         memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1111         mutex_unlock(&local->mtx);
1112
1113         /* we cannot take the mutex while preparing the setup packet */
1114         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1115                                               dialog_token, status_code,
1116                                               peer_capability, initiator,
1117                                               extra_ies, extra_ies_len, 0,
1118                                               NULL);
1119         if (ret < 0) {
1120                 mutex_lock(&local->mtx);
1121                 eth_zero_addr(sdata->u.mgd.tdls_peer);
1122                 mutex_unlock(&local->mtx);
1123                 return ret;
1124         }
1125
1126         ieee80211_queue_delayed_work(&sdata->local->hw,
1127                                      &sdata->u.mgd.tdls_peer_del_work,
1128                                      TDLS_PEER_SETUP_TIMEOUT);
1129         return 0;
1130
1131 out_unlock:
1132         mutex_unlock(&local->mtx);
1133         return ret;
1134 }
1135
1136 static int
1137 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1138                              const u8 *peer, u8 action_code, u8 dialog_token,
1139                              u16 status_code, u32 peer_capability,
1140                              bool initiator, const u8 *extra_ies,
1141                              size_t extra_ies_len)
1142 {
1143         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1144         struct ieee80211_local *local = sdata->local;
1145         struct sta_info *sta;
1146         int ret;
1147
1148         /*
1149          * No packets can be transmitted to the peer via the AP during setup -
1150          * the STA is set as a TDLS peer, but is not authorized.
1151          * During teardown, we prevent direct transmissions by stopping the
1152          * queues and flushing all direct packets.
1153          */
1154         ieee80211_stop_vif_queues(local, sdata,
1155                                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1156         ieee80211_flush_queues(local, sdata, false);
1157
1158         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1159                                               dialog_token, status_code,
1160                                               peer_capability, initiator,
1161                                               extra_ies, extra_ies_len, 0,
1162                                               NULL);
1163         if (ret < 0)
1164                 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1165                           ret);
1166
1167         /*
1168          * Remove the STA AUTH flag to force further traffic through the AP. If
1169          * the STA was unreachable, it was already removed.
1170          */
1171         rcu_read_lock();
1172         sta = sta_info_get(sdata, peer);
1173         if (sta)
1174                 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1175         rcu_read_unlock();
1176
1177         ieee80211_wake_vif_queues(local, sdata,
1178                                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1179
1180         return 0;
1181 }
1182
1183 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1184                         const u8 *peer, u8 action_code, u8 dialog_token,
1185                         u16 status_code, u32 peer_capability,
1186                         bool initiator, const u8 *extra_ies,
1187                         size_t extra_ies_len)
1188 {
1189         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1190         int ret;
1191
1192         if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1193                 return -ENOTSUPP;
1194
1195         /* make sure we are in managed mode, and associated */
1196         if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1197             !sdata->u.mgd.associated)
1198                 return -EINVAL;
1199
1200         switch (action_code) {
1201         case WLAN_TDLS_SETUP_REQUEST:
1202         case WLAN_TDLS_SETUP_RESPONSE:
1203                 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1204                                                 dialog_token, status_code,
1205                                                 peer_capability, initiator,
1206                                                 extra_ies, extra_ies_len);
1207                 break;
1208         case WLAN_TDLS_TEARDOWN:
1209                 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1210                                                    action_code, dialog_token,
1211                                                    status_code,
1212                                                    peer_capability, initiator,
1213                                                    extra_ies, extra_ies_len);
1214                 break;
1215         case WLAN_TDLS_DISCOVERY_REQUEST:
1216                 /*
1217                  * Protect the discovery so we can hear the TDLS discovery
1218                  * response frame. It is transmitted directly and not buffered
1219                  * by the AP.
1220                  */
1221                 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1222                 /* fall-through */
1223         case WLAN_TDLS_SETUP_CONFIRM:
1224         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1225                 /* no special handling */
1226                 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1227                                                       action_code,
1228                                                       dialog_token,
1229                                                       status_code,
1230                                                       peer_capability,
1231                                                       initiator, extra_ies,
1232                                                       extra_ies_len, 0, NULL);
1233                 break;
1234         default:
1235                 ret = -EOPNOTSUPP;
1236                 break;
1237         }
1238
1239         tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1240                  action_code, peer, ret);
1241         return ret;
1242 }
1243
1244 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1245                                          struct sta_info *sta)
1246 {
1247         struct ieee80211_local *local = sdata->local;
1248         struct ieee80211_chanctx_conf *conf;
1249         struct ieee80211_chanctx *ctx;
1250         enum nl80211_chan_width width;
1251         struct ieee80211_supported_band *sband;
1252
1253         mutex_lock(&local->chanctx_mtx);
1254         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1255                                          lockdep_is_held(&local->chanctx_mtx));
1256         if (conf) {
1257                 width = conf->def.width;
1258                 sband = local->hw.wiphy->bands[conf->def.chan->band];
1259                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1260                 ieee80211_recalc_chanctx_chantype(local, ctx);
1261
1262                 /* if width changed and a peer is given, update its BW */
1263                 if (width != conf->def.width && sta &&
1264                     test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1265                         enum ieee80211_sta_rx_bandwidth bw;
1266
1267                         bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1268                         bw = min(bw, ieee80211_sta_cap_rx_bw(sta));
1269                         if (bw != sta->sta.bandwidth) {
1270                                 sta->sta.bandwidth = bw;
1271                                 rate_control_rate_update(local, sband, sta,
1272                                                          IEEE80211_RC_BW_CHANGED);
1273                                 /*
1274                                  * if a TDLS peer BW was updated, we need to
1275                                  * recalc the chandef width again, to get the
1276                                  * correct chanctx min_def
1277                                  */
1278                                 ieee80211_recalc_chanctx_chantype(local, ctx);
1279                         }
1280                 }
1281
1282         }
1283         mutex_unlock(&local->chanctx_mtx);
1284 }
1285
1286 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1287 {
1288         struct sta_info *sta;
1289         bool result = false;
1290
1291         rcu_read_lock();
1292         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1293                 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1294                     !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1295                     !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1296                     !sta->sta.ht_cap.ht_supported)
1297                         continue;
1298                 result = true;
1299                 break;
1300         }
1301         rcu_read_unlock();
1302
1303         return result;
1304 }
1305
1306 static void
1307 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1308                                    struct sta_info *sta)
1309 {
1310         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1311         bool tdls_ht;
1312         u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1313                          IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1314                          IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1315         u16 opmode;
1316
1317         /* Nothing to do if the BSS connection uses HT */
1318         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
1319                 return;
1320
1321         tdls_ht = (sta && sta->sta.ht_cap.ht_supported) ||
1322                   iee80211_tdls_have_ht_peers(sdata);
1323
1324         opmode = sdata->vif.bss_conf.ht_operation_mode;
1325
1326         if (tdls_ht)
1327                 opmode |= protection;
1328         else
1329                 opmode &= ~protection;
1330
1331         if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1332                 return;
1333
1334         sdata->vif.bss_conf.ht_operation_mode = opmode;
1335         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT);
1336 }
1337
1338 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1339                         const u8 *peer, enum nl80211_tdls_operation oper)
1340 {
1341         struct sta_info *sta;
1342         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1343         struct ieee80211_local *local = sdata->local;
1344         int ret;
1345
1346         if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1347                 return -ENOTSUPP;
1348
1349         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1350                 return -EINVAL;
1351
1352         switch (oper) {
1353         case NL80211_TDLS_ENABLE_LINK:
1354         case NL80211_TDLS_DISABLE_LINK:
1355                 break;
1356         case NL80211_TDLS_TEARDOWN:
1357         case NL80211_TDLS_SETUP:
1358         case NL80211_TDLS_DISCOVERY_REQ:
1359                 /* We don't support in-driver setup/teardown/discovery */
1360                 return -ENOTSUPP;
1361         }
1362
1363         /* protect possible bss_conf changes and avoid concurrency in
1364          * ieee80211_bss_info_change_notify()
1365          */
1366         sdata_lock(sdata);
1367         mutex_lock(&local->mtx);
1368         tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1369
1370         switch (oper) {
1371         case NL80211_TDLS_ENABLE_LINK:
1372                 if (sdata->vif.csa_active) {
1373                         tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1374                         ret = -EBUSY;
1375                         break;
1376                 }
1377
1378                 mutex_lock(&local->sta_mtx);
1379                 sta = sta_info_get(sdata, peer);
1380                 if (!sta) {
1381                         mutex_unlock(&local->sta_mtx);
1382                         ret = -ENOLINK;
1383                         break;
1384                 }
1385
1386                 iee80211_tdls_recalc_chanctx(sdata, sta);
1387                 iee80211_tdls_recalc_ht_protection(sdata, sta);
1388
1389                 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1390                 mutex_unlock(&local->sta_mtx);
1391
1392                 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1393                              !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1394                 ret = 0;
1395                 break;
1396         case NL80211_TDLS_DISABLE_LINK:
1397                 /*
1398                  * The teardown message in ieee80211_tdls_mgmt_teardown() was
1399                  * created while the queues were stopped, so it might still be
1400                  * pending. Before flushing the queues we need to be sure the
1401                  * message is handled by the tasklet handling pending messages,
1402                  * otherwise we might start destroying the station before
1403                  * sending the teardown packet.
1404                  * Note that this only forces the tasklet to flush pendings -
1405                  * not to stop the tasklet from rescheduling itself.
1406                  */
1407                 tasklet_kill(&local->tx_pending_tasklet);
1408                 /* flush a potentially queued teardown packet */
1409                 ieee80211_flush_queues(local, sdata, false);
1410
1411                 ret = sta_info_destroy_addr(sdata, peer);
1412
1413                 mutex_lock(&local->sta_mtx);
1414                 iee80211_tdls_recalc_ht_protection(sdata, NULL);
1415                 mutex_unlock(&local->sta_mtx);
1416
1417                 iee80211_tdls_recalc_chanctx(sdata, NULL);
1418                 break;
1419         default:
1420                 ret = -ENOTSUPP;
1421                 break;
1422         }
1423
1424         if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1425                 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1426                 eth_zero_addr(sdata->u.mgd.tdls_peer);
1427         }
1428
1429         if (ret == 0)
1430                 ieee80211_queue_work(&sdata->local->hw,
1431                                      &sdata->u.mgd.request_smps_work);
1432
1433         mutex_unlock(&local->mtx);
1434         sdata_unlock(sdata);
1435         return ret;
1436 }
1437
1438 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1439                                  enum nl80211_tdls_operation oper,
1440                                  u16 reason_code, gfp_t gfp)
1441 {
1442         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1443
1444         if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1445                 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1446                           oper);
1447                 return;
1448         }
1449
1450         cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1451 }
1452 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1453
1454 static void
1455 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1456 {
1457         struct ieee80211_ch_switch_timing *ch_sw;
1458
1459         *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1460         *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1461
1462         ch_sw = (void *)buf;
1463         ch_sw->switch_time = cpu_to_le16(switch_time);
1464         ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1465 }
1466
1467 /* find switch timing IE in SKB ready for Tx */
1468 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1469 {
1470         struct ieee80211_tdls_data *tf;
1471         const u8 *ie_start;
1472
1473         /*
1474          * Get the offset for the new location of the switch timing IE.
1475          * The SKB network header will now point to the "payload_type"
1476          * element of the TDLS data frame struct.
1477          */
1478         tf = container_of(skb->data + skb_network_offset(skb),
1479                           struct ieee80211_tdls_data, payload_type);
1480         ie_start = tf->u.chan_switch_req.variable;
1481         return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1482                                 skb->len - (ie_start - skb->data));
1483 }
1484
1485 static struct sk_buff *
1486 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1487                               struct cfg80211_chan_def *chandef,
1488                               u32 *ch_sw_tm_ie_offset)
1489 {
1490         struct ieee80211_sub_if_data *sdata = sta->sdata;
1491         u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1492                      2 + sizeof(struct ieee80211_ch_switch_timing)];
1493         int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1494         u8 *pos = extra_ies;
1495         struct sk_buff *skb;
1496
1497         /*
1498          * if chandef points to a wide channel add a Secondary-Channel
1499          * Offset information element
1500          */
1501         if (chandef->width == NL80211_CHAN_WIDTH_40) {
1502                 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1503                 bool ht40plus;
1504
1505                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1506                 *pos++ = sizeof(*sec_chan_ie);
1507                 sec_chan_ie = (void *)pos;
1508
1509                 ht40plus = cfg80211_get_chandef_type(chandef) ==
1510                                                         NL80211_CHAN_HT40PLUS;
1511                 sec_chan_ie->sec_chan_offs = ht40plus ?
1512                                              IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1513                                              IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1514                 pos += sizeof(*sec_chan_ie);
1515
1516                 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1517         }
1518
1519         /* just set the values to 0, this is a template */
1520         iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1521
1522         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1523                                               WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1524                                               0, 0, !sta->sta.tdls_initiator,
1525                                               extra_ies, extra_ies_len,
1526                                               oper_class, chandef);
1527         if (!skb)
1528                 return NULL;
1529
1530         skb = ieee80211_build_data_template(sdata, skb, 0);
1531         if (IS_ERR(skb)) {
1532                 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1533                 return NULL;
1534         }
1535
1536         if (ch_sw_tm_ie_offset) {
1537                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1538
1539                 if (!tm_ie) {
1540                         tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1541                         dev_kfree_skb_any(skb);
1542                         return NULL;
1543                 }
1544
1545                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1546         }
1547
1548         tdls_dbg(sdata,
1549                  "TDLS channel switch request template for %pM ch %d width %d\n",
1550                  sta->sta.addr, chandef->chan->center_freq, chandef->width);
1551         return skb;
1552 }
1553
1554 int
1555 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1556                               const u8 *addr, u8 oper_class,
1557                               struct cfg80211_chan_def *chandef)
1558 {
1559         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1560         struct ieee80211_local *local = sdata->local;
1561         struct sta_info *sta;
1562         struct sk_buff *skb = NULL;
1563         u32 ch_sw_tm_ie;
1564         int ret;
1565
1566         mutex_lock(&local->sta_mtx);
1567         sta = sta_info_get(sdata, addr);
1568         if (!sta) {
1569                 tdls_dbg(sdata,
1570                          "Invalid TDLS peer %pM for channel switch request\n",
1571                          addr);
1572                 ret = -ENOENT;
1573                 goto out;
1574         }
1575
1576         if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1577                 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1578                          addr);
1579                 ret = -ENOTSUPP;
1580                 goto out;
1581         }
1582
1583         skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1584                                             &ch_sw_tm_ie);
1585         if (!skb) {
1586                 ret = -ENOENT;
1587                 goto out;
1588         }
1589
1590         ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1591                                       chandef, skb, ch_sw_tm_ie);
1592         if (!ret)
1593                 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1594
1595 out:
1596         mutex_unlock(&local->sta_mtx);
1597         dev_kfree_skb_any(skb);
1598         return ret;
1599 }
1600
1601 void
1602 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1603                                      struct net_device *dev,
1604                                      const u8 *addr)
1605 {
1606         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1607         struct ieee80211_local *local = sdata->local;
1608         struct sta_info *sta;
1609
1610         mutex_lock(&local->sta_mtx);
1611         sta = sta_info_get(sdata, addr);
1612         if (!sta) {
1613                 tdls_dbg(sdata,
1614                          "Invalid TDLS peer %pM for channel switch cancel\n",
1615                          addr);
1616                 goto out;
1617         }
1618
1619         if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1620                 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1621                          addr);
1622                 goto out;
1623         }
1624
1625         drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1626         clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1627
1628 out:
1629         mutex_unlock(&local->sta_mtx);
1630 }
1631
1632 static struct sk_buff *
1633 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1634                                    u32 *ch_sw_tm_ie_offset)
1635 {
1636         struct ieee80211_sub_if_data *sdata = sta->sdata;
1637         struct sk_buff *skb;
1638         u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1639
1640         /* initial timing are always zero in the template */
1641         iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1642
1643         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1644                                         WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1645                                         0, 0, !sta->sta.tdls_initiator,
1646                                         extra_ies, sizeof(extra_ies), 0, NULL);
1647         if (!skb)
1648                 return NULL;
1649
1650         skb = ieee80211_build_data_template(sdata, skb, 0);
1651         if (IS_ERR(skb)) {
1652                 tdls_dbg(sdata,
1653                          "Failed building TDLS channel switch resp frame\n");
1654                 return NULL;
1655         }
1656
1657         if (ch_sw_tm_ie_offset) {
1658                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1659
1660                 if (!tm_ie) {
1661                         tdls_dbg(sdata,
1662                                  "No switch timing IE in TDLS switch resp\n");
1663                         dev_kfree_skb_any(skb);
1664                         return NULL;
1665                 }
1666
1667                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1668         }
1669
1670         tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1671                  sta->sta.addr);
1672         return skb;
1673 }
1674
1675 static int
1676 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1677                                            struct sk_buff *skb)
1678 {
1679         struct ieee80211_local *local = sdata->local;
1680         struct ieee802_11_elems elems;
1681         struct sta_info *sta;
1682         struct ieee80211_tdls_data *tf = (void *)skb->data;
1683         bool local_initiator;
1684         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1685         int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1686         struct ieee80211_tdls_ch_sw_params params = {};
1687         int ret;
1688
1689         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1690         params.timestamp = rx_status->device_timestamp;
1691
1692         if (skb->len < baselen) {
1693                 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1694                          skb->len);
1695                 return -EINVAL;
1696         }
1697
1698         mutex_lock(&local->sta_mtx);
1699         sta = sta_info_get(sdata, tf->sa);
1700         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1701                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1702                          tf->sa);
1703                 ret = -EINVAL;
1704                 goto out;
1705         }
1706
1707         params.sta = &sta->sta;
1708         params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1709         if (params.status != 0) {
1710                 ret = 0;
1711                 goto call_drv;
1712         }
1713
1714         ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1715                                skb->len - baselen, false, &elems);
1716         if (elems.parse_error) {
1717                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1718                 ret = -EINVAL;
1719                 goto out;
1720         }
1721
1722         if (!elems.ch_sw_timing || !elems.lnk_id) {
1723                 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1724                 ret = -EINVAL;
1725                 goto out;
1726         }
1727
1728         /* validate the initiator is set correctly */
1729         local_initiator =
1730                 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1731         if (local_initiator == sta->sta.tdls_initiator) {
1732                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1733                 ret = -EINVAL;
1734                 goto out;
1735         }
1736
1737         params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1738         params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1739
1740         params.tmpl_skb =
1741                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1742         if (!params.tmpl_skb) {
1743                 ret = -ENOENT;
1744                 goto out;
1745         }
1746
1747         ret = 0;
1748 call_drv:
1749         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1750
1751         tdls_dbg(sdata,
1752                  "TDLS channel switch response received from %pM status %d\n",
1753                  tf->sa, params.status);
1754
1755 out:
1756         mutex_unlock(&local->sta_mtx);
1757         dev_kfree_skb_any(params.tmpl_skb);
1758         return ret;
1759 }
1760
1761 static int
1762 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1763                                           struct sk_buff *skb)
1764 {
1765         struct ieee80211_local *local = sdata->local;
1766         struct ieee802_11_elems elems;
1767         struct cfg80211_chan_def chandef;
1768         struct ieee80211_channel *chan;
1769         enum nl80211_channel_type chan_type;
1770         int freq;
1771         u8 target_channel, oper_class;
1772         bool local_initiator;
1773         struct sta_info *sta;
1774         enum nl80211_band band;
1775         struct ieee80211_tdls_data *tf = (void *)skb->data;
1776         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1777         int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1778         struct ieee80211_tdls_ch_sw_params params = {};
1779         int ret = 0;
1780
1781         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1782         params.timestamp = rx_status->device_timestamp;
1783
1784         if (skb->len < baselen) {
1785                 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1786                          skb->len);
1787                 return -EINVAL;
1788         }
1789
1790         target_channel = tf->u.chan_switch_req.target_channel;
1791         oper_class = tf->u.chan_switch_req.oper_class;
1792
1793         /*
1794          * We can't easily infer the channel band. The operating class is
1795          * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1796          * solution here is to treat channels with number >14 as 5GHz ones,
1797          * and specifically check for the (oper_class, channel) combinations
1798          * where this doesn't hold. These are thankfully unique according to
1799          * IEEE802.11-2012.
1800          * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1801          * valid here.
1802          */
1803         if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1804              oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1805              target_channel < 14)
1806                 band = NL80211_BAND_5GHZ;
1807         else
1808                 band = target_channel < 14 ? NL80211_BAND_2GHZ :
1809                                              NL80211_BAND_5GHZ;
1810
1811         freq = ieee80211_channel_to_frequency(target_channel, band);
1812         if (freq == 0) {
1813                 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1814                          target_channel);
1815                 return -EINVAL;
1816         }
1817
1818         chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1819         if (!chan) {
1820                 tdls_dbg(sdata,
1821                          "Unsupported channel for TDLS chan switch: %d\n",
1822                          target_channel);
1823                 return -EINVAL;
1824         }
1825
1826         ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1827                                skb->len - baselen, false, &elems);
1828         if (elems.parse_error) {
1829                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1830                 return -EINVAL;
1831         }
1832
1833         if (!elems.ch_sw_timing || !elems.lnk_id) {
1834                 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1835                 return -EINVAL;
1836         }
1837
1838         if (!elems.sec_chan_offs) {
1839                 chan_type = NL80211_CHAN_HT20;
1840         } else {
1841                 switch (elems.sec_chan_offs->sec_chan_offs) {
1842                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1843                         chan_type = NL80211_CHAN_HT40PLUS;
1844                         break;
1845                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1846                         chan_type = NL80211_CHAN_HT40MINUS;
1847                         break;
1848                 default:
1849                         chan_type = NL80211_CHAN_HT20;
1850                         break;
1851                 }
1852         }
1853
1854         cfg80211_chandef_create(&chandef, chan, chan_type);
1855
1856         /* we will be active on the TDLS link */
1857         if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1858                                            sdata->wdev.iftype)) {
1859                 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1860                 return -EINVAL;
1861         }
1862
1863         mutex_lock(&local->sta_mtx);
1864         sta = sta_info_get(sdata, tf->sa);
1865         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1866                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1867                          tf->sa);
1868                 ret = -EINVAL;
1869                 goto out;
1870         }
1871
1872         params.sta = &sta->sta;
1873
1874         /* validate the initiator is set correctly */
1875         local_initiator =
1876                 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1877         if (local_initiator == sta->sta.tdls_initiator) {
1878                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1879                 ret = -EINVAL;
1880                 goto out;
1881         }
1882
1883         /* peer should have known better */
1884         if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs &&
1885             elems.sec_chan_offs->sec_chan_offs) {
1886                 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1887                 ret = -ENOTSUPP;
1888                 goto out;
1889         }
1890
1891         params.chandef = &chandef;
1892         params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1893         params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1894
1895         params.tmpl_skb =
1896                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1897                                                    &params.ch_sw_tm_ie);
1898         if (!params.tmpl_skb) {
1899                 ret = -ENOENT;
1900                 goto out;
1901         }
1902
1903         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1904
1905         tdls_dbg(sdata,
1906                  "TDLS ch switch request received from %pM ch %d width %d\n",
1907                  tf->sa, params.chandef->chan->center_freq,
1908                  params.chandef->width);
1909 out:
1910         mutex_unlock(&local->sta_mtx);
1911         dev_kfree_skb_any(params.tmpl_skb);
1912         return ret;
1913 }
1914
1915 static void
1916 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1917                                       struct sk_buff *skb)
1918 {
1919         struct ieee80211_tdls_data *tf = (void *)skb->data;
1920         struct wiphy *wiphy = sdata->local->hw.wiphy;
1921
1922         ASSERT_RTNL();
1923
1924         /* make sure the driver supports it */
1925         if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1926                 return;
1927
1928         /* we want to access the entire packet */
1929         if (skb_linearize(skb))
1930                 return;
1931         /*
1932          * The packet/size was already validated by mac80211 Rx path, only look
1933          * at the action type.
1934          */
1935         switch (tf->action_code) {
1936         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1937                 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1938                 break;
1939         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1940                 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1941                 break;
1942         default:
1943                 WARN_ON_ONCE(1);
1944                 return;
1945         }
1946 }
1947
1948 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1949 {
1950         struct sta_info *sta;
1951         u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1952
1953         rcu_read_lock();
1954         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1955                 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1956                     !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1957                         continue;
1958
1959                 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1960                                             NL80211_TDLS_TEARDOWN, reason,
1961                                             GFP_ATOMIC);
1962         }
1963         rcu_read_unlock();
1964 }
1965
1966 void ieee80211_tdls_chsw_work(struct work_struct *wk)
1967 {
1968         struct ieee80211_local *local =
1969                 container_of(wk, struct ieee80211_local, tdls_chsw_work);
1970         struct ieee80211_sub_if_data *sdata;
1971         struct sk_buff *skb;
1972         struct ieee80211_tdls_data *tf;
1973
1974         rtnl_lock();
1975         while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) {
1976                 tf = (struct ieee80211_tdls_data *)skb->data;
1977                 list_for_each_entry(sdata, &local->interfaces, list) {
1978                         if (!ieee80211_sdata_running(sdata) ||
1979                             sdata->vif.type != NL80211_IFTYPE_STATION ||
1980                             !ether_addr_equal(tf->da, sdata->vif.addr))
1981                                 continue;
1982
1983                         ieee80211_process_tdls_channel_switch(sdata, skb);
1984                         break;
1985                 }
1986
1987                 kfree_skb(skb);
1988         }
1989         rtnl_unlock();
1990 }
1991
1992 void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata,
1993                                       const u8 *peer, u16 reason)
1994 {
1995         struct ieee80211_sta *sta;
1996
1997         rcu_read_lock();
1998         sta = ieee80211_find_sta(&sdata->vif, peer);
1999         if (!sta || !sta->tdls) {
2000                 rcu_read_unlock();
2001                 return;
2002         }
2003         rcu_read_unlock();
2004
2005         tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n",
2006                  peer, reason,
2007                  ieee80211_get_reason_code_string(reason));
2008
2009         ieee80211_tdls_oper_request(&sdata->vif, peer,
2010                                     NL80211_TDLS_TEARDOWN,
2011                                     WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE,
2012                                     GFP_ATOMIC);
2013 }