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         enum nl80211_band band = ieee80211_get_sdata_band(sdata);
  51         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
  52         bool vht = sband && sband->vht_cap.vht_supported;
  53         u8 *pos = (void *)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 = (void *)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         /* The capability will be 0 when sending a failure code */
 184         if (status_code != 0)
 185                 return 0;
 186
 187         if (ieee80211_get_sdata_band(sdata) == NL80211_BAND_2GHZ) {
 188                 return WLAN_CAPABILITY_SHORT_SLOT_TIME |
 189                        WLAN_CAPABILITY_SHORT_PREAMBLE;
 190         }
 191
 192         return 0;
 193 }
 194
 195 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
 196                                        struct sk_buff *skb, const u8 *peer,
 197                                        bool initiator)
 198 {
 199         struct ieee80211_tdls_lnkie *lnkid;
 200         const u8 *init_addr, *rsp_addr;
 201
 202         if (initiator) {
 203                 init_addr = sdata->vif.addr;
 204                 rsp_addr = peer;
 205         } else {
 206                 init_addr = peer;
 207                 rsp_addr = sdata->vif.addr;
 208         }
 209
 210         lnkid = (void *)skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
 211
 212         lnkid->ie_type = WLAN_EID_LINK_ID;
 213         lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
 214
 215         memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 216         memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
 217         memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
 218 }
 219
 220 static void
 221 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 222 {
 223         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 224         u8 *pos = (void *)skb_put(skb, 4);
 225
 226         *pos++ = WLAN_EID_AID;
 227         *pos++ = 2; /* len */
 228         put_unaligned_le16(ifmgd->aid, pos);
 229 }
 230
 231 /* translate numbering in the WMM parameter IE to the mac80211 notation */
 232 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
 233 {
 234         switch (ac) {
 235         default:
 236                 WARN_ON_ONCE(1);
 237         case 0:
 238                 return IEEE80211_AC_BE;
 239         case 1:
 240                 return IEEE80211_AC_BK;
 241         case 2:
 242                 return IEEE80211_AC_VI;
 243         case 3:
 244                 return IEEE80211_AC_VO;
 245         }
 246 }
 247
 248 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
 249 {
 250         u8 ret;
 251
 252         ret = aifsn & 0x0f;
 253         if (acm)
 254                 ret |= 0x10;
 255         ret |= (aci << 5) & 0x60;
 256         return ret;
 257 }
 258
 259 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
 260 {
 261         return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
 262                ((ilog2(cw_max + 1) << 0x4) & 0xf0);
 263 }
 264
 265 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
 266                                             struct sk_buff *skb)
 267 {
 268         struct ieee80211_wmm_param_ie *wmm;
 269         struct ieee80211_tx_queue_params *txq;
 270         int i;
 271
 272         wmm = (void *)skb_put(skb, sizeof(*wmm));
 273         memset(wmm, 0, sizeof(*wmm));
 274
 275         wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
 276         wmm->len = sizeof(*wmm) - 2;
 277
 278         wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
 279         wmm->oui[1] = 0x50;
 280         wmm->oui[2] = 0xf2;
 281         wmm->oui_type = 2; /* WME */
 282         wmm->oui_subtype = 1; /* WME param */
 283         wmm->version = 1; /* WME ver */
 284         wmm->qos_info = 0; /* U-APSD not in use */
 285
 286         /*
 287          * Use the EDCA parameters defined for the BSS, or default if the AP
 288          * doesn't support it, as mandated by 802.11-2012 section 10.22.4
 289          */
 290         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 291                 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
 292                 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
 293                                                                txq->acm, i);
 294                 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
 295                 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
 296         }
 297 }
 298
 299 static void
 300 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
 301                                    struct sta_info *sta)
 302 {
 303         /* IEEE802.11ac-2013 Table E-4 */
 304         u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
 305         struct cfg80211_chan_def uc = sta->tdls_chandef;
 306         enum nl80211_chan_width max_width = ieee80211_sta_cap_chan_bw(sta);
 307         int i;
 308
 309         /* only support upgrading non-narrow channels up to 80Mhz */
 310         if (max_width == NL80211_CHAN_WIDTH_5 ||
 311             max_width == NL80211_CHAN_WIDTH_10)
 312                 return;
 313
 314         if (max_width > NL80211_CHAN_WIDTH_80)
 315                 max_width = NL80211_CHAN_WIDTH_80;
 316
 317         if (uc.width >= max_width)
 318                 return;
 319         /*
 320          * Channel usage constrains in the IEEE802.11ac-2013 specification only
 321          * allow expanding a 20MHz channel to 80MHz in a single way. In
 322          * addition, there are no 40MHz allowed channels that are not part of
 323          * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
 324          */
 325         for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
 326                 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
 327                         uc.center_freq1 = centers_80mhz[i];
 328                         uc.center_freq2 = 0;
 329                         uc.width = NL80211_CHAN_WIDTH_80;
 330                         break;
 331                 }
 332
 333         if (!uc.center_freq1)
 334                 return;
 335
 336         /* proceed to downgrade the chandef until usable or the same as AP BW */
 337         while (uc.width > max_width ||
 338                (uc.width > sta->tdls_chandef.width &&
 339                 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
 340                                                sdata->wdev.iftype)))
 341                 ieee80211_chandef_downgrade(&uc);
 342
 343         if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
 344                 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
 345                          sta->tdls_chandef.width, uc.width);
 346
 347                 /*
 348                  * the station is not yet authorized when BW upgrade is done,
 349                  * locking is not required
 350                  */
 351                 sta->tdls_chandef = uc;
 352         }
 353 }
 354
 355 static void
 356 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
 357                                    struct sk_buff *skb, const u8 *peer,
 358                                    u8 action_code, bool initiator,
 359                                    const u8 *extra_ies, size_t extra_ies_len)
 360 {
 361         enum nl80211_band band = ieee80211_get_sdata_band(sdata);
 362         struct ieee80211_local *local = sdata->local;
 363         struct ieee80211_supported_band *sband;
 364         struct ieee80211_sta_ht_cap ht_cap;
 365         struct ieee80211_sta_vht_cap vht_cap;
 366         struct sta_info *sta = NULL;
 367         size_t offset = 0, noffset;
 368         u8 *pos;
 369
 370         ieee80211_add_srates_ie(sdata, skb, false, band);
 371         ieee80211_add_ext_srates_ie(sdata, skb, false, band);
 372         ieee80211_tdls_add_supp_channels(sdata, skb);
 373
 374         /* add any custom IEs that go before Extended Capabilities */
 375         if (extra_ies_len) {
 376                 static const u8 before_ext_cap[] = {
 377                         WLAN_EID_SUPP_RATES,
 378                         WLAN_EID_COUNTRY,
 379                         WLAN_EID_EXT_SUPP_RATES,
 380                         WLAN_EID_SUPPORTED_CHANNELS,
 381                         WLAN_EID_RSN,
 382                 };
 383                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 384                                              before_ext_cap,
 385                                              ARRAY_SIZE(before_ext_cap),
 386                                              offset);
 387                 pos = skb_put(skb, noffset - offset);
 388                 memcpy(pos, extra_ies + offset, noffset - offset);
 389                 offset = noffset;
 390         }
 391
 392         ieee80211_tdls_add_ext_capab(sdata, skb);
 393
 394         /* add the QoS element if we support it */
 395         if (local->hw.queues >= IEEE80211_NUM_ACS &&
 396             action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
 397                 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
 398
 399         /* add any custom IEs that go before HT capabilities */
 400         if (extra_ies_len) {
 401                 static const u8 before_ht_cap[] = {
 402                         WLAN_EID_SUPP_RATES,
 403                         WLAN_EID_COUNTRY,
 404                         WLAN_EID_EXT_SUPP_RATES,
 405                         WLAN_EID_SUPPORTED_CHANNELS,
 406                         WLAN_EID_RSN,
 407                         WLAN_EID_EXT_CAPABILITY,
 408                         WLAN_EID_QOS_CAPA,
 409                         WLAN_EID_FAST_BSS_TRANSITION,
 410                         WLAN_EID_TIMEOUT_INTERVAL,
 411                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 412                 };
 413                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 414                                              before_ht_cap,
 415                                              ARRAY_SIZE(before_ht_cap),
 416                                              offset);
 417                 pos = skb_put(skb, noffset - offset);
 418                 memcpy(pos, extra_ies + offset, noffset - offset);
 419                 offset = noffset;
 420         }
 421
 422         mutex_lock(&local->sta_mtx);
 423
 424         /* we should have the peer STA if we're already responding */
 425         if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
 426                 sta = sta_info_get(sdata, peer);
 427                 if (WARN_ON_ONCE(!sta)) {
 428                         mutex_unlock(&local->sta_mtx);
 429                         return;
 430                 }
 431
 432                 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
 433         }
 434
 435         ieee80211_tdls_add_oper_classes(sdata, skb);
 436
 437         /*
 438          * with TDLS we can switch channels, and HT-caps are not necessarily
 439          * the same on all bands. The specification limits the setup to a
 440          * single HT-cap, so use the current band for now.
 441          */
 442         sband = local->hw.wiphy->bands[band];
 443         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 444
 445         if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 446              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 447             ht_cap.ht_supported) {
 448                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 449
 450                 /* disable SMPS in TDLS initiator */
 451                 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
 452                                 << IEEE80211_HT_CAP_SM_PS_SHIFT;
 453
 454                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 455                 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 456         } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 457                    ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
 458                 /* the peer caps are already intersected with our own */
 459                 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
 460
 461                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 462                 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 463         }
 464
 465         if (ht_cap.ht_supported &&
 466             (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
 467                 ieee80211_tdls_add_bss_coex_ie(skb);
 468
 469         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 470
 471         /* add any custom IEs that go before VHT capabilities */
 472         if (extra_ies_len) {
 473                 static const u8 before_vht_cap[] = {
 474                         WLAN_EID_SUPP_RATES,
 475                         WLAN_EID_COUNTRY,
 476                         WLAN_EID_EXT_SUPP_RATES,
 477                         WLAN_EID_SUPPORTED_CHANNELS,
 478                         WLAN_EID_RSN,
 479                         WLAN_EID_EXT_CAPABILITY,
 480                         WLAN_EID_QOS_CAPA,
 481                         WLAN_EID_FAST_BSS_TRANSITION,
 482                         WLAN_EID_TIMEOUT_INTERVAL,
 483                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 484                         WLAN_EID_MULTI_BAND,
 485                 };
 486                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 487                                              before_vht_cap,
 488                                              ARRAY_SIZE(before_vht_cap),
 489                                              offset);
 490                 pos = skb_put(skb, noffset - offset);
 491                 memcpy(pos, extra_ies + offset, noffset - offset);
 492                 offset = noffset;
 493         }
 494
 495         /* build the VHT-cap similarly to the HT-cap */
 496         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 497         if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 498              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 499             vht_cap.vht_supported) {
 500                 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 501
 502                 /* the AID is present only when VHT is implemented */
 503                 if (action_code == WLAN_TDLS_SETUP_REQUEST)
 504                         ieee80211_tdls_add_aid(sdata, skb);
 505
 506                 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 507                 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 508         } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 509                    vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
 510                 /* the peer caps are already intersected with our own */
 511                 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
 512
 513                 /* the AID is present only when VHT is implemented */
 514                 ieee80211_tdls_add_aid(sdata, skb);
 515
 516                 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 517                 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 518
 519                 /*
 520                  * if both peers support WIDER_BW, we can expand the chandef to
 521                  * a wider compatible one, up to 80MHz
 522                  */
 523                 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 524                         ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 525         }
 526
 527         mutex_unlock(&local->sta_mtx);
 528
 529         /* add any remaining IEs */
 530         if (extra_ies_len) {
 531                 noffset = extra_ies_len;
 532                 pos = skb_put(skb, noffset - offset);
 533                 memcpy(pos, 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         enum nl80211_band band = ieee80211_get_sdata_band(sdata);
 549         u8 *pos;
 550
 551         mutex_lock(&local->sta_mtx);
 552
 553         sta = sta_info_get(sdata, peer);
 554         ap_sta = sta_info_get(sdata, ifmgd->bssid);
 555         if (WARN_ON_ONCE(!sta || !ap_sta)) {
 556                 mutex_unlock(&local->sta_mtx);
 557                 return;
 558         }
 559
 560         sta->tdls_chandef = sdata->vif.bss_conf.chandef;
 561
 562         /* add any custom IEs that go before the QoS IE */
 563         if (extra_ies_len) {
 564                 static const u8 before_qos[] = {
 565                         WLAN_EID_RSN,
 566                 };
 567                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 568                                              before_qos,
 569                                              ARRAY_SIZE(before_qos),
 570                                              offset);
 571                 pos = skb_put(skb, noffset - offset);
 572                 memcpy(pos, extra_ies + offset, noffset - offset);
 573                 offset = noffset;
 574         }
 575
 576         /* add the QoS param IE if both the peer and we support it */
 577         if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
 578                 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
 579
 580         /* add any custom IEs that go before HT operation */
 581         if (extra_ies_len) {
 582                 static const u8 before_ht_op[] = {
 583                         WLAN_EID_RSN,
 584                         WLAN_EID_QOS_CAPA,
 585                         WLAN_EID_FAST_BSS_TRANSITION,
 586                         WLAN_EID_TIMEOUT_INTERVAL,
 587                 };
 588                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 589                                              before_ht_op,
 590                                              ARRAY_SIZE(before_ht_op),
 591                                              offset);
 592                 pos = skb_put(skb, noffset - offset);
 593                 memcpy(pos, extra_ies + offset, noffset - offset);
 594                 offset = noffset;
 595         }
 596
 597         /*
 598          * if HT support is only added in TDLS, we need an HT-operation IE.
 599          * add the IE as required by IEEE802.11-2012 9.23.3.2.
 600          */
 601         if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
 602                 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
 603                            IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
 604                            IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
 605
 606                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 607                 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
 608                                            &sdata->vif.bss_conf.chandef, prot,
 609                                            true);
 610         }
 611
 612         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 613
 614         /* only include VHT-operation if not on the 2.4GHz band */
 615         if (band != NL80211_BAND_2GHZ && sta->sta.vht_cap.vht_supported) {
 616                 /*
 617                  * if both peers support WIDER_BW, we can expand the chandef to
 618                  * a wider compatible one, up to 80MHz
 619                  */
 620                 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 621                         ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 622
 623                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 624                 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
 625                                             &sta->tdls_chandef);
 626         }
 627
 628         mutex_unlock(&local->sta_mtx);
 629
 630         /* add any remaining IEs */
 631         if (extra_ies_len) {
 632                 noffset = extra_ies_len;
 633                 pos = skb_put(skb, noffset - offset);
 634                 memcpy(pos, extra_ies + offset, noffset - offset);
 635         }
 636 }
 637
 638 static void
 639 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
 640                                        struct sk_buff *skb, const u8 *peer,
 641                                        bool initiator, const u8 *extra_ies,
 642                                        size_t extra_ies_len, u8 oper_class,
 643                                        struct cfg80211_chan_def *chandef)
 644 {
 645         struct ieee80211_tdls_data *tf;
 646         size_t offset = 0, noffset;
 647         u8 *pos;
 648
 649         if (WARN_ON_ONCE(!chandef))
 650                 return;
 651
 652         tf = (void *)skb->data;
 653         tf->u.chan_switch_req.target_channel =
 654                 ieee80211_frequency_to_channel(chandef->chan->center_freq);
 655         tf->u.chan_switch_req.oper_class = oper_class;
 656
 657         if (extra_ies_len) {
 658                 static const u8 before_lnkie[] = {
 659                         WLAN_EID_SECONDARY_CHANNEL_OFFSET,
 660                 };
 661                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 662                                              before_lnkie,
 663                                              ARRAY_SIZE(before_lnkie),
 664                                              offset);
 665                 pos = skb_put(skb, noffset - offset);
 666                 memcpy(pos, extra_ies + offset, noffset - offset);
 667                 offset = noffset;
 668         }
 669
 670         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 671
 672         /* add any remaining IEs */
 673         if (extra_ies_len) {
 674                 noffset = extra_ies_len;
 675                 pos = skb_put(skb, noffset - offset);
 676                 memcpy(pos, extra_ies + offset, noffset - offset);
 677         }
 678 }
 679
 680 static void
 681 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
 682                                         struct sk_buff *skb, const u8 *peer,
 683                                         u16 status_code, bool initiator,
 684                                         const u8 *extra_ies,
 685                                         size_t extra_ies_len)
 686 {
 687         if (status_code == 0)
 688                 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 689
 690         if (extra_ies_len)
 691                 memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
 692 }
 693
 694 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
 695                                    struct sk_buff *skb, const u8 *peer,
 696                                    u8 action_code, u16 status_code,
 697                                    bool initiator, const u8 *extra_ies,
 698                                    size_t extra_ies_len, u8 oper_class,
 699                                    struct cfg80211_chan_def *chandef)
 700 {
 701         switch (action_code) {
 702         case WLAN_TDLS_SETUP_REQUEST:
 703         case WLAN_TDLS_SETUP_RESPONSE:
 704         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 705                 if (status_code == 0)
 706                         ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
 707                                                            action_code,
 708                                                            initiator,
 709                                                            extra_ies,
 710                                                            extra_ies_len);
 711                 break;
 712         case WLAN_TDLS_SETUP_CONFIRM:
 713                 if (status_code == 0)
 714                         ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
 715                                                          initiator, extra_ies,
 716                                                          extra_ies_len);
 717                 break;
 718         case WLAN_TDLS_TEARDOWN:
 719         case WLAN_TDLS_DISCOVERY_REQUEST:
 720                 if (extra_ies_len)
 721                         memcpy(skb_put(skb, extra_ies_len), extra_ies,
 722                                extra_ies_len);
 723                 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
 724                         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 725                 break;
 726         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 727                 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
 728                                                        initiator, extra_ies,
 729                                                        extra_ies_len,
 730                                                        oper_class, chandef);
 731                 break;
 732         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 733                 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
 734                                                         status_code,
 735                                                         initiator, extra_ies,
 736                                                         extra_ies_len);
 737                 break;
 738         }
 739
 740 }
 741
 742 static int
 743 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
 744                                const u8 *peer, u8 action_code, u8 dialog_token,
 745                                u16 status_code, struct sk_buff *skb)
 746 {
 747         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 748         struct ieee80211_tdls_data *tf;
 749
 750         tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
 751
 752         memcpy(tf->da, peer, ETH_ALEN);
 753         memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
 754         tf->ether_type = cpu_to_be16(ETH_P_TDLS);
 755         tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
 756
 757         /* network header is after the ethernet header */
 758         skb_set_network_header(skb, ETH_HLEN);
 759
 760         switch (action_code) {
 761         case WLAN_TDLS_SETUP_REQUEST:
 762                 tf->category = WLAN_CATEGORY_TDLS;
 763                 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
 764
 765                 skb_put(skb, sizeof(tf->u.setup_req));
 766                 tf->u.setup_req.dialog_token = dialog_token;
 767                 tf->u.setup_req.capability =
 768                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 769                                                                  status_code));
 770                 break;
 771         case WLAN_TDLS_SETUP_RESPONSE:
 772                 tf->category = WLAN_CATEGORY_TDLS;
 773                 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
 774
 775                 skb_put(skb, sizeof(tf->u.setup_resp));
 776                 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
 777                 tf->u.setup_resp.dialog_token = dialog_token;
 778                 tf->u.setup_resp.capability =
 779                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 780                                                                  status_code));
 781                 break;
 782         case WLAN_TDLS_SETUP_CONFIRM:
 783                 tf->category = WLAN_CATEGORY_TDLS;
 784                 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
 785
 786                 skb_put(skb, sizeof(tf->u.setup_cfm));
 787                 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
 788                 tf->u.setup_cfm.dialog_token = dialog_token;
 789                 break;
 790         case WLAN_TDLS_TEARDOWN:
 791                 tf->category = WLAN_CATEGORY_TDLS;
 792                 tf->action_code = WLAN_TDLS_TEARDOWN;
 793
 794                 skb_put(skb, sizeof(tf->u.teardown));
 795                 tf->u.teardown.reason_code = cpu_to_le16(status_code);
 796                 break;
 797         case WLAN_TDLS_DISCOVERY_REQUEST:
 798                 tf->category = WLAN_CATEGORY_TDLS;
 799                 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
 800
 801                 skb_put(skb, sizeof(tf->u.discover_req));
 802                 tf->u.discover_req.dialog_token = dialog_token;
 803                 break;
 804         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 805                 tf->category = WLAN_CATEGORY_TDLS;
 806                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
 807
 808                 skb_put(skb, sizeof(tf->u.chan_switch_req));
 809                 break;
 810         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 811                 tf->category = WLAN_CATEGORY_TDLS;
 812                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
 813
 814                 skb_put(skb, sizeof(tf->u.chan_switch_resp));
 815                 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
 816                 break;
 817         default:
 818                 return -EINVAL;
 819         }
 820
 821         return 0;
 822 }
 823
 824 static int
 825 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
 826                            const u8 *peer, u8 action_code, u8 dialog_token,
 827                            u16 status_code, struct sk_buff *skb)
 828 {
 829         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 830         struct ieee80211_mgmt *mgmt;
 831
 832         mgmt = (void *)skb_put(skb, 24);
 833         memset(mgmt, 0, 24);
 834         memcpy(mgmt->da, peer, ETH_ALEN);
 835         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 836         memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 837
 838         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 839                                           IEEE80211_STYPE_ACTION);
 840
 841         switch (action_code) {
 842         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 843                 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
 844                 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
 845                 mgmt->u.action.u.tdls_discover_resp.action_code =
 846                         WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
 847                 mgmt->u.action.u.tdls_discover_resp.dialog_token =
 848                         dialog_token;
 849                 mgmt->u.action.u.tdls_discover_resp.capability =
 850                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 851                                                                  status_code));
 852                 break;
 853         default:
 854                 return -EINVAL;
 855         }
 856
 857         return 0;
 858 }
 859
 860 static struct sk_buff *
 861 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
 862                                       const u8 *peer, u8 action_code,
 863                                       u8 dialog_token, u16 status_code,
 864                                       bool initiator, const u8 *extra_ies,
 865                                       size_t extra_ies_len, u8 oper_class,
 866                                       struct cfg80211_chan_def *chandef)
 867 {
 868         struct ieee80211_local *local = sdata->local;
 869         struct sk_buff *skb;
 870         int ret;
 871
 872         skb = netdev_alloc_skb(sdata->dev,
 873                                local->hw.extra_tx_headroom +
 874                                max(sizeof(struct ieee80211_mgmt),
 875                                    sizeof(struct ieee80211_tdls_data)) +
 876                                50 + /* supported rates */
 877                                10 + /* ext capab */
 878                                26 + /* max(WMM-info, WMM-param) */
 879                                2 + max(sizeof(struct ieee80211_ht_cap),
 880                                        sizeof(struct ieee80211_ht_operation)) +
 881                                2 + max(sizeof(struct ieee80211_vht_cap),
 882                                        sizeof(struct ieee80211_vht_operation)) +
 883                                50 + /* supported channels */
 884                                3 + /* 40/20 BSS coex */
 885                                4 + /* AID */
 886                                4 + /* oper classes */
 887                                extra_ies_len +
 888                                sizeof(struct ieee80211_tdls_lnkie));
 889         if (!skb)
 890                 return NULL;
 891
 892         skb_reserve(skb, local->hw.extra_tx_headroom);
 893
 894         switch (action_code) {
 895         case WLAN_TDLS_SETUP_REQUEST:
 896         case WLAN_TDLS_SETUP_RESPONSE:
 897         case WLAN_TDLS_SETUP_CONFIRM:
 898         case WLAN_TDLS_TEARDOWN:
 899         case WLAN_TDLS_DISCOVERY_REQUEST:
 900         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 901         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 902                 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
 903                                                      sdata->dev, peer,
 904                                                      action_code, dialog_token,
 905                                                      status_code, skb);
 906                 break;
 907         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 908                 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
 909                                                  peer, action_code,
 910                                                  dialog_token, status_code,
 911                                                  skb);
 912                 break;
 913         default:
 914                 ret = -ENOTSUPP;
 915                 break;
 916         }
 917
 918         if (ret < 0)
 919                 goto fail;
 920
 921         ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
 922                                initiator, extra_ies, extra_ies_len, oper_class,
 923                                chandef);
 924         return skb;
 925
 926 fail:
 927         dev_kfree_skb(skb);
 928         return NULL;
 929 }
 930
 931 static int
 932 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
 933                                 const u8 *peer, u8 action_code, u8 dialog_token,
 934                                 u16 status_code, u32 peer_capability,
 935                                 bool initiator, const u8 *extra_ies,
 936                                 size_t extra_ies_len, u8 oper_class,
 937                                 struct cfg80211_chan_def *chandef)
 938 {
 939         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 940         struct sk_buff *skb = NULL;
 941         struct sta_info *sta;
 942         u32 flags = 0;
 943         int ret = 0;
 944
 945         rcu_read_lock();
 946         sta = sta_info_get(sdata, peer);
 947
 948         /* infer the initiator if we can, to support old userspace */
 949         switch (action_code) {
 950         case WLAN_TDLS_SETUP_REQUEST:
 951                 if (sta) {
 952                         set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
 953                         sta->sta.tdls_initiator = false;
 954                 }
 955                 /* fall-through */
 956         case WLAN_TDLS_SETUP_CONFIRM:
 957         case WLAN_TDLS_DISCOVERY_REQUEST:
 958                 initiator = true;
 959                 break;
 960         case WLAN_TDLS_SETUP_RESPONSE:
 961                 /*
 962                  * In some testing scenarios, we send a request and response.
 963                  * Make the last packet sent take effect for the initiator
 964                  * value.
 965                  */
 966                 if (sta) {
 967                         clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
 968                         sta->sta.tdls_initiator = true;
 969                 }
 970                 /* fall-through */
 971         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 972                 initiator = false;
 973                 break;
 974         case WLAN_TDLS_TEARDOWN:
 975         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 976         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 977                 /* any value is ok */
 978                 break;
 979         default:
 980                 ret = -ENOTSUPP;
 981                 break;
 982         }
 983
 984         if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
 985                 initiator = true;
 986
 987         rcu_read_unlock();
 988         if (ret < 0)
 989                 goto fail;
 990
 991         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
 992                                                     dialog_token, status_code,
 993                                                     initiator, extra_ies,
 994                                                     extra_ies_len, oper_class,
 995                                                     chandef);
 996         if (!skb) {
 997                 ret = -EINVAL;
 998                 goto fail;
 999         }
1000
1001         if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
1002                 ieee80211_tx_skb(sdata, skb);
1003                 return 0;
1004         }
1005
1006         /*
1007          * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1008          * we should default to AC_VI.
1009          */
1010         switch (action_code) {
1011         case WLAN_TDLS_SETUP_REQUEST:
1012         case WLAN_TDLS_SETUP_RESPONSE:
1013                 skb_set_queue_mapping(skb, IEEE80211_AC_BK);
1014                 skb->priority = 2;
1015                 break;
1016         default:
1017                 skb_set_queue_mapping(skb, IEEE80211_AC_VI);
1018                 skb->priority = 5;
1019                 break;
1020         }
1021
1022         /*
1023          * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1024          * Later, if no ACK is returned from peer, we will re-send the teardown
1025          * packet through the AP.
1026          */
1027         if ((action_code == WLAN_TDLS_TEARDOWN) &&
1028             ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1029                 bool try_resend; /* Should we keep skb for possible resend */
1030
1031                 /* If not sending directly to peer - no point in keeping skb */
1032                 rcu_read_lock();
1033                 sta = sta_info_get(sdata, peer);
1034                 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1035                 rcu_read_unlock();
1036
1037                 spin_lock_bh(&sdata->u.mgd.teardown_lock);
1038                 if (try_resend && !sdata->u.mgd.teardown_skb) {
1039                         /* Mark it as requiring TX status callback  */
1040                         flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1041                                  IEEE80211_TX_INTFL_MLME_CONN_TX;
1042
1043                         /*
1044                          * skb is copied since mac80211 will later set
1045                          * properties that might not be the same as the AP,
1046                          * such as encryption, QoS, addresses, etc.
1047                          *
1048                          * No problem if skb_copy() fails, so no need to check.
1049                          */
1050                         sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1051                         sdata->u.mgd.orig_teardown_skb = skb;
1052                 }
1053                 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1054         }
1055
1056         /* disable bottom halves when entering the Tx path */
1057         local_bh_disable();
1058         __ieee80211_subif_start_xmit(skb, dev, flags);
1059         local_bh_enable();
1060
1061         return ret;
1062
1063 fail:
1064         dev_kfree_skb(skb);
1065         return ret;
1066 }
1067
1068 static int
1069 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1070                           const u8 *peer, u8 action_code, u8 dialog_token,
1071                           u16 status_code, u32 peer_capability, bool initiator,
1072                           const u8 *extra_ies, size_t extra_ies_len)
1073 {
1074         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1075         struct ieee80211_local *local = sdata->local;
1076         enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode;
1077         int ret;
1078
1079         /* don't support setup with forced SMPS mode that's not off */
1080         if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1081             smps_mode != IEEE80211_SMPS_OFF) {
1082                 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1083                          smps_mode);
1084                 return -ENOTSUPP;
1085         }
1086
1087         mutex_lock(&local->mtx);
1088
1089         /* we don't support concurrent TDLS peer setups */
1090         if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1091             !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1092                 ret = -EBUSY;
1093                 goto out_unlock;
1094         }
1095
1096         /*
1097          * make sure we have a STA representing the peer so we drop or buffer
1098          * non-TDLS-setup frames to the peer. We can't send other packets
1099          * during setup through the AP path.
1100          * Allow error packets to be sent - sometimes we don't even add a STA
1101          * before failing the setup.
1102          */
1103         if (status_code == 0) {
1104                 rcu_read_lock();
1105                 if (!sta_info_get(sdata, peer)) {
1106                         rcu_read_unlock();
1107                         ret = -ENOLINK;
1108                         goto out_unlock;
1109                 }
1110                 rcu_read_unlock();
1111         }
1112
1113         ieee80211_flush_queues(local, sdata, false);
1114         memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1115         mutex_unlock(&local->mtx);
1116
1117         /* we cannot take the mutex while preparing the setup packet */
1118         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1119                                               dialog_token, status_code,
1120                                               peer_capability, initiator,
1121                                               extra_ies, extra_ies_len, 0,
1122                                               NULL);
1123         if (ret < 0) {
1124                 mutex_lock(&local->mtx);
1125                 eth_zero_addr(sdata->u.mgd.tdls_peer);
1126                 mutex_unlock(&local->mtx);
1127                 return ret;
1128         }
1129
1130         ieee80211_queue_delayed_work(&sdata->local->hw,
1131                                      &sdata->u.mgd.tdls_peer_del_work,
1132                                      TDLS_PEER_SETUP_TIMEOUT);
1133         return 0;
1134
1135 out_unlock:
1136         mutex_unlock(&local->mtx);
1137         return ret;
1138 }
1139
1140 static int
1141 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1142                              const u8 *peer, u8 action_code, u8 dialog_token,
1143                              u16 status_code, u32 peer_capability,
1144                              bool initiator, const u8 *extra_ies,
1145                              size_t extra_ies_len)
1146 {
1147         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1148         struct ieee80211_local *local = sdata->local;
1149         struct sta_info *sta;
1150         int ret;
1151
1152         /*
1153          * No packets can be transmitted to the peer via the AP during setup -
1154          * the STA is set as a TDLS peer, but is not authorized.
1155          * During teardown, we prevent direct transmissions by stopping the
1156          * queues and flushing all direct packets.
1157          */
1158         ieee80211_stop_vif_queues(local, sdata,
1159                                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1160         ieee80211_flush_queues(local, sdata, false);
1161
1162         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1163                                               dialog_token, status_code,
1164                                               peer_capability, initiator,
1165                                               extra_ies, extra_ies_len, 0,
1166                                               NULL);
1167         if (ret < 0)
1168                 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1169                           ret);
1170
1171         /*
1172          * Remove the STA AUTH flag to force further traffic through the AP. If
1173          * the STA was unreachable, it was already removed.
1174          */
1175         rcu_read_lock();
1176         sta = sta_info_get(sdata, peer);
1177         if (sta)
1178                 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1179         rcu_read_unlock();
1180
1181         ieee80211_wake_vif_queues(local, sdata,
1182                                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1183
1184         return 0;
1185 }
1186
1187 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1188                         const u8 *peer, u8 action_code, u8 dialog_token,
1189                         u16 status_code, u32 peer_capability,
1190                         bool initiator, const u8 *extra_ies,
1191                         size_t extra_ies_len)
1192 {
1193         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1194         int ret;
1195
1196         if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1197                 return -ENOTSUPP;
1198
1199         /* make sure we are in managed mode, and associated */
1200         if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1201             !sdata->u.mgd.associated)
1202                 return -EINVAL;
1203
1204         switch (action_code) {
1205         case WLAN_TDLS_SETUP_REQUEST:
1206         case WLAN_TDLS_SETUP_RESPONSE:
1207                 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1208                                                 dialog_token, status_code,
1209                                                 peer_capability, initiator,
1210                                                 extra_ies, extra_ies_len);
1211                 break;
1212         case WLAN_TDLS_TEARDOWN:
1213                 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1214                                                    action_code, dialog_token,
1215                                                    status_code,
1216                                                    peer_capability, initiator,
1217                                                    extra_ies, extra_ies_len);
1218                 break;
1219         case WLAN_TDLS_DISCOVERY_REQUEST:
1220                 /*
1221                  * Protect the discovery so we can hear the TDLS discovery
1222                  * response frame. It is transmitted directly and not buffered
1223                  * by the AP.
1224                  */
1225                 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1226                 /* fall-through */
1227         case WLAN_TDLS_SETUP_CONFIRM:
1228         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1229                 /* no special handling */
1230                 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1231                                                       action_code,
1232                                                       dialog_token,
1233                                                       status_code,
1234                                                       peer_capability,
1235                                                       initiator, extra_ies,
1236                                                       extra_ies_len, 0, NULL);
1237                 break;
1238         default:
1239                 ret = -EOPNOTSUPP;
1240                 break;
1241         }
1242
1243         tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1244                  action_code, peer, ret);
1245         return ret;
1246 }
1247
1248 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1249                                          struct sta_info *sta)
1250 {
1251         struct ieee80211_local *local = sdata->local;
1252         struct ieee80211_chanctx_conf *conf;
1253         struct ieee80211_chanctx *ctx;
1254         enum nl80211_chan_width width;
1255         struct ieee80211_supported_band *sband;
1256
1257         mutex_lock(&local->chanctx_mtx);
1258         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1259                                          lockdep_is_held(&local->chanctx_mtx));
1260         if (conf) {
1261                 width = conf->def.width;
1262                 sband = local->hw.wiphy->bands[conf->def.chan->band];
1263                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1264                 ieee80211_recalc_chanctx_chantype(local, ctx);
1265
1266                 /* if width changed and a peer is given, update its BW */
1267                 if (width != conf->def.width && sta &&
1268                     test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1269                         enum ieee80211_sta_rx_bandwidth bw;
1270
1271                         bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1272                         bw = min(bw, ieee80211_sta_cap_rx_bw(sta));
1273                         if (bw != sta->sta.bandwidth) {
1274                                 sta->sta.bandwidth = bw;
1275                                 rate_control_rate_update(local, sband, sta,
1276                                                          IEEE80211_RC_BW_CHANGED);
1277                                 /*
1278                                  * if a TDLS peer BW was updated, we need to
1279                                  * recalc the chandef width again, to get the
1280                                  * correct chanctx min_def
1281                                  */
1282                                 ieee80211_recalc_chanctx_chantype(local, ctx);
1283                         }
1284                 }
1285
1286         }
1287         mutex_unlock(&local->chanctx_mtx);
1288 }
1289
1290 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1291 {
1292         struct sta_info *sta;
1293         bool result = false;
1294
1295         rcu_read_lock();
1296         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1297                 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1298                     !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1299                     !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1300                     !sta->sta.ht_cap.ht_supported)
1301                         continue;
1302                 result = true;
1303                 break;
1304         }
1305         rcu_read_unlock();
1306
1307         return result;
1308 }
1309
1310 static void
1311 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1312                                    struct sta_info *sta)
1313 {
1314         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1315         bool tdls_ht;
1316         u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1317                          IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1318                          IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1319         u16 opmode;
1320
1321         /* Nothing to do if the BSS connection uses HT */
1322         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
1323                 return;
1324
1325         tdls_ht = (sta && sta->sta.ht_cap.ht_supported) ||
1326                   iee80211_tdls_have_ht_peers(sdata);
1327
1328         opmode = sdata->vif.bss_conf.ht_operation_mode;
1329
1330         if (tdls_ht)
1331                 opmode |= protection;
1332         else
1333                 opmode &= ~protection;
1334
1335         if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1336                 return;
1337
1338         sdata->vif.bss_conf.ht_operation_mode = opmode;
1339         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT);
1340 }
1341
1342 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1343                         const u8 *peer, enum nl80211_tdls_operation oper)
1344 {
1345         struct sta_info *sta;
1346         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1347         struct ieee80211_local *local = sdata->local;
1348         int ret;
1349
1350         if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1351                 return -ENOTSUPP;
1352
1353         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1354                 return -EINVAL;
1355
1356         switch (oper) {
1357         case NL80211_TDLS_ENABLE_LINK:
1358         case NL80211_TDLS_DISABLE_LINK:
1359                 break;
1360         case NL80211_TDLS_TEARDOWN:
1361         case NL80211_TDLS_SETUP:
1362         case NL80211_TDLS_DISCOVERY_REQ:
1363                 /* We don't support in-driver setup/teardown/discovery */
1364                 return -ENOTSUPP;
1365         }
1366
1367         /* protect possible bss_conf changes and avoid concurrency in
1368          * ieee80211_bss_info_change_notify()
1369          */
1370         sdata_lock(sdata);
1371         mutex_lock(&local->mtx);
1372         tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1373
1374         switch (oper) {
1375         case NL80211_TDLS_ENABLE_LINK:
1376                 if (sdata->vif.csa_active) {
1377                         tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1378                         ret = -EBUSY;
1379                         break;
1380                 }
1381
1382                 mutex_lock(&local->sta_mtx);
1383                 sta = sta_info_get(sdata, peer);
1384                 if (!sta) {
1385                         mutex_unlock(&local->sta_mtx);
1386                         ret = -ENOLINK;
1387                         break;
1388                 }
1389
1390                 iee80211_tdls_recalc_chanctx(sdata, sta);
1391                 iee80211_tdls_recalc_ht_protection(sdata, sta);
1392
1393                 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1394                 mutex_unlock(&local->sta_mtx);
1395
1396                 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1397                              !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1398                 ret = 0;
1399                 break;
1400         case NL80211_TDLS_DISABLE_LINK:
1401                 /*
1402                  * The teardown message in ieee80211_tdls_mgmt_teardown() was
1403                  * created while the queues were stopped, so it might still be
1404                  * pending. Before flushing the queues we need to be sure the
1405                  * message is handled by the tasklet handling pending messages,
1406                  * otherwise we might start destroying the station before
1407                  * sending the teardown packet.
1408                  * Note that this only forces the tasklet to flush pendings -
1409                  * not to stop the tasklet from rescheduling itself.
1410                  */
1411                 tasklet_kill(&local->tx_pending_tasklet);
1412                 /* flush a potentially queued teardown packet */
1413                 ieee80211_flush_queues(local, sdata, false);
1414
1415                 ret = sta_info_destroy_addr(sdata, peer);
1416
1417                 mutex_lock(&local->sta_mtx);
1418                 iee80211_tdls_recalc_ht_protection(sdata, NULL);
1419                 mutex_unlock(&local->sta_mtx);
1420
1421                 iee80211_tdls_recalc_chanctx(sdata, NULL);
1422                 break;
1423         default:
1424                 ret = -ENOTSUPP;
1425                 break;
1426         }
1427
1428         if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1429                 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1430                 eth_zero_addr(sdata->u.mgd.tdls_peer);
1431         }
1432
1433         if (ret == 0)
1434                 ieee80211_queue_work(&sdata->local->hw,
1435                                      &sdata->u.mgd.request_smps_work);
1436
1437         mutex_unlock(&local->mtx);
1438         sdata_unlock(sdata);
1439         return ret;
1440 }
1441
1442 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1443                                  enum nl80211_tdls_operation oper,
1444                                  u16 reason_code, gfp_t gfp)
1445 {
1446         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1447
1448         if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1449                 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1450                           oper);
1451                 return;
1452         }
1453
1454         cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1455 }
1456 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1457
1458 static void
1459 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1460 {
1461         struct ieee80211_ch_switch_timing *ch_sw;
1462
1463         *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1464         *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1465
1466         ch_sw = (void *)buf;
1467         ch_sw->switch_time = cpu_to_le16(switch_time);
1468         ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1469 }
1470
1471 /* find switch timing IE in SKB ready for Tx */
1472 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1473 {
1474         struct ieee80211_tdls_data *tf;
1475         const u8 *ie_start;
1476
1477         /*
1478          * Get the offset for the new location of the switch timing IE.
1479          * The SKB network header will now point to the "payload_type"
1480          * element of the TDLS data frame struct.
1481          */
1482         tf = container_of(skb->data + skb_network_offset(skb),
1483                           struct ieee80211_tdls_data, payload_type);
1484         ie_start = tf->u.chan_switch_req.variable;
1485         return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1486                                 skb->len - (ie_start - skb->data));
1487 }
1488
1489 static struct sk_buff *
1490 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1491                               struct cfg80211_chan_def *chandef,
1492                               u32 *ch_sw_tm_ie_offset)
1493 {
1494         struct ieee80211_sub_if_data *sdata = sta->sdata;
1495         u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1496                      2 + sizeof(struct ieee80211_ch_switch_timing)];
1497         int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1498         u8 *pos = extra_ies;
1499         struct sk_buff *skb;
1500
1501         /*
1502          * if chandef points to a wide channel add a Secondary-Channel
1503          * Offset information element
1504          */
1505         if (chandef->width == NL80211_CHAN_WIDTH_40) {
1506                 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1507                 bool ht40plus;
1508
1509                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1510                 *pos++ = sizeof(*sec_chan_ie);
1511                 sec_chan_ie = (void *)pos;
1512
1513                 ht40plus = cfg80211_get_chandef_type(chandef) ==
1514                                                         NL80211_CHAN_HT40PLUS;
1515                 sec_chan_ie->sec_chan_offs = ht40plus ?
1516                                              IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1517                                              IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1518                 pos += sizeof(*sec_chan_ie);
1519
1520                 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1521         }
1522
1523         /* just set the values to 0, this is a template */
1524         iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1525
1526         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1527                                               WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1528                                               0, 0, !sta->sta.tdls_initiator,
1529                                               extra_ies, extra_ies_len,
1530                                               oper_class, chandef);
1531         if (!skb)
1532                 return NULL;
1533
1534         skb = ieee80211_build_data_template(sdata, skb, 0);
1535         if (IS_ERR(skb)) {
1536                 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1537                 return NULL;
1538         }
1539
1540         if (ch_sw_tm_ie_offset) {
1541                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1542
1543                 if (!tm_ie) {
1544                         tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1545                         dev_kfree_skb_any(skb);
1546                         return NULL;
1547                 }
1548
1549                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1550         }
1551
1552         tdls_dbg(sdata,
1553                  "TDLS channel switch request template for %pM ch %d width %d\n",
1554                  sta->sta.addr, chandef->chan->center_freq, chandef->width);
1555         return skb;
1556 }
1557
1558 int
1559 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1560                               const u8 *addr, u8 oper_class,
1561                               struct cfg80211_chan_def *chandef)
1562 {
1563         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1564         struct ieee80211_local *local = sdata->local;
1565         struct sta_info *sta;
1566         struct sk_buff *skb = NULL;
1567         u32 ch_sw_tm_ie;
1568         int ret;
1569
1570         mutex_lock(&local->sta_mtx);
1571         sta = sta_info_get(sdata, addr);
1572         if (!sta) {
1573                 tdls_dbg(sdata,
1574                          "Invalid TDLS peer %pM for channel switch request\n",
1575                          addr);
1576                 ret = -ENOENT;
1577                 goto out;
1578         }
1579
1580         if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1581                 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1582                          addr);
1583                 ret = -ENOTSUPP;
1584                 goto out;
1585         }
1586
1587         skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1588                                             &ch_sw_tm_ie);
1589         if (!skb) {
1590                 ret = -ENOENT;
1591                 goto out;
1592         }
1593
1594         ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1595                                       chandef, skb, ch_sw_tm_ie);
1596         if (!ret)
1597                 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1598
1599 out:
1600         mutex_unlock(&local->sta_mtx);
1601         dev_kfree_skb_any(skb);
1602         return ret;
1603 }
1604
1605 void
1606 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1607                                      struct net_device *dev,
1608                                      const u8 *addr)
1609 {
1610         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1611         struct ieee80211_local *local = sdata->local;
1612         struct sta_info *sta;
1613
1614         mutex_lock(&local->sta_mtx);
1615         sta = sta_info_get(sdata, addr);
1616         if (!sta) {
1617                 tdls_dbg(sdata,
1618                          "Invalid TDLS peer %pM for channel switch cancel\n",
1619                          addr);
1620                 goto out;
1621         }
1622
1623         if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1624                 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1625                          addr);
1626                 goto out;
1627         }
1628
1629         drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1630         clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1631
1632 out:
1633         mutex_unlock(&local->sta_mtx);
1634 }
1635
1636 static struct sk_buff *
1637 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1638                                    u32 *ch_sw_tm_ie_offset)
1639 {
1640         struct ieee80211_sub_if_data *sdata = sta->sdata;
1641         struct sk_buff *skb;
1642         u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1643
1644         /* initial timing are always zero in the template */
1645         iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1646
1647         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1648                                         WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1649                                         0, 0, !sta->sta.tdls_initiator,
1650                                         extra_ies, sizeof(extra_ies), 0, NULL);
1651         if (!skb)
1652                 return NULL;
1653
1654         skb = ieee80211_build_data_template(sdata, skb, 0);
1655         if (IS_ERR(skb)) {
1656                 tdls_dbg(sdata,
1657                          "Failed building TDLS channel switch resp frame\n");
1658                 return NULL;
1659         }
1660
1661         if (ch_sw_tm_ie_offset) {
1662                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1663
1664                 if (!tm_ie) {
1665                         tdls_dbg(sdata,
1666                                  "No switch timing IE in TDLS switch resp\n");
1667                         dev_kfree_skb_any(skb);
1668                         return NULL;
1669                 }
1670
1671                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1672         }
1673
1674         tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1675                  sta->sta.addr);
1676         return skb;
1677 }
1678
1679 static int
1680 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1681                                            struct sk_buff *skb)
1682 {
1683         struct ieee80211_local *local = sdata->local;
1684         struct ieee802_11_elems elems;
1685         struct sta_info *sta;
1686         struct ieee80211_tdls_data *tf = (void *)skb->data;
1687         bool local_initiator;
1688         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1689         int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1690         struct ieee80211_tdls_ch_sw_params params = {};
1691         int ret;
1692
1693         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1694         params.timestamp = rx_status->device_timestamp;
1695
1696         if (skb->len < baselen) {
1697                 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1698                          skb->len);
1699                 return -EINVAL;
1700         }
1701
1702         mutex_lock(&local->sta_mtx);
1703         sta = sta_info_get(sdata, tf->sa);
1704         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1705                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1706                          tf->sa);
1707                 ret = -EINVAL;
1708                 goto out;
1709         }
1710
1711         params.sta = &sta->sta;
1712         params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1713         if (params.status != 0) {
1714                 ret = 0;
1715                 goto call_drv;
1716         }
1717
1718         ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1719                                skb->len - baselen, false, &elems);
1720         if (elems.parse_error) {
1721                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1722                 ret = -EINVAL;
1723                 goto out;
1724         }
1725
1726         if (!elems.ch_sw_timing || !elems.lnk_id) {
1727                 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1728                 ret = -EINVAL;
1729                 goto out;
1730         }
1731
1732         /* validate the initiator is set correctly */
1733         local_initiator =
1734                 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1735         if (local_initiator == sta->sta.tdls_initiator) {
1736                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1737                 ret = -EINVAL;
1738                 goto out;
1739         }
1740
1741         params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1742         params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1743
1744         params.tmpl_skb =
1745                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1746         if (!params.tmpl_skb) {
1747                 ret = -ENOENT;
1748                 goto out;
1749         }
1750
1751         ret = 0;
1752 call_drv:
1753         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1754
1755         tdls_dbg(sdata,
1756                  "TDLS channel switch response received from %pM status %d\n",
1757                  tf->sa, params.status);
1758
1759 out:
1760         mutex_unlock(&local->sta_mtx);
1761         dev_kfree_skb_any(params.tmpl_skb);
1762         return ret;
1763 }
1764
1765 static int
1766 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1767                                           struct sk_buff *skb)
1768 {
1769         struct ieee80211_local *local = sdata->local;
1770         struct ieee802_11_elems elems;
1771         struct cfg80211_chan_def chandef;
1772         struct ieee80211_channel *chan;
1773         enum nl80211_channel_type chan_type;
1774         int freq;
1775         u8 target_channel, oper_class;
1776         bool local_initiator;
1777         struct sta_info *sta;
1778         enum nl80211_band band;
1779         struct ieee80211_tdls_data *tf = (void *)skb->data;
1780         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1781         int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1782         struct ieee80211_tdls_ch_sw_params params = {};
1783         int ret = 0;
1784
1785         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1786         params.timestamp = rx_status->device_timestamp;
1787
1788         if (skb->len < baselen) {
1789                 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1790                          skb->len);
1791                 return -EINVAL;
1792         }
1793
1794         target_channel = tf->u.chan_switch_req.target_channel;
1795         oper_class = tf->u.chan_switch_req.oper_class;
1796
1797         /*
1798          * We can't easily infer the channel band. The operating class is
1799          * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1800          * solution here is to treat channels with number >14 as 5GHz ones,
1801          * and specifically check for the (oper_class, channel) combinations
1802          * where this doesn't hold. These are thankfully unique according to
1803          * IEEE802.11-2012.
1804          * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1805          * valid here.
1806          */
1807         if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1808              oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1809              target_channel < 14)
1810                 band = NL80211_BAND_5GHZ;
1811         else
1812                 band = target_channel < 14 ? NL80211_BAND_2GHZ :
1813                                              NL80211_BAND_5GHZ;
1814
1815         freq = ieee80211_channel_to_frequency(target_channel, band);
1816         if (freq == 0) {
1817                 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1818                          target_channel);
1819                 return -EINVAL;
1820         }
1821
1822         chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1823         if (!chan) {
1824                 tdls_dbg(sdata,
1825                          "Unsupported channel for TDLS chan switch: %d\n",
1826                          target_channel);
1827                 return -EINVAL;
1828         }
1829
1830         ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1831                                skb->len - baselen, false, &elems);
1832         if (elems.parse_error) {
1833                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1834                 return -EINVAL;
1835         }
1836
1837         if (!elems.ch_sw_timing || !elems.lnk_id) {
1838                 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1839                 return -EINVAL;
1840         }
1841
1842         if (!elems.sec_chan_offs) {
1843                 chan_type = NL80211_CHAN_HT20;
1844         } else {
1845                 switch (elems.sec_chan_offs->sec_chan_offs) {
1846                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1847                         chan_type = NL80211_CHAN_HT40PLUS;
1848                         break;
1849                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1850                         chan_type = NL80211_CHAN_HT40MINUS;
1851                         break;
1852                 default:
1853                         chan_type = NL80211_CHAN_HT20;
1854                         break;
1855                 }
1856         }
1857
1858         cfg80211_chandef_create(&chandef, chan, chan_type);
1859
1860         /* we will be active on the TDLS link */
1861         if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1862                                            sdata->wdev.iftype)) {
1863                 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1864                 return -EINVAL;
1865         }
1866
1867         mutex_lock(&local->sta_mtx);
1868         sta = sta_info_get(sdata, tf->sa);
1869         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1870                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1871                          tf->sa);
1872                 ret = -EINVAL;
1873                 goto out;
1874         }
1875
1876         params.sta = &sta->sta;
1877
1878         /* validate the initiator is set correctly */
1879         local_initiator =
1880                 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1881         if (local_initiator == sta->sta.tdls_initiator) {
1882                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1883                 ret = -EINVAL;
1884                 goto out;
1885         }
1886
1887         /* peer should have known better */
1888         if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs &&
1889             elems.sec_chan_offs->sec_chan_offs) {
1890                 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1891                 ret = -ENOTSUPP;
1892                 goto out;
1893         }
1894
1895         params.chandef = &chandef;
1896         params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1897         params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1898
1899         params.tmpl_skb =
1900                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1901                                                    &params.ch_sw_tm_ie);
1902         if (!params.tmpl_skb) {
1903                 ret = -ENOENT;
1904                 goto out;
1905         }
1906
1907         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1908
1909         tdls_dbg(sdata,
1910                  "TDLS ch switch request received from %pM ch %d width %d\n",
1911                  tf->sa, params.chandef->chan->center_freq,
1912                  params.chandef->width);
1913 out:
1914         mutex_unlock(&local->sta_mtx);
1915         dev_kfree_skb_any(params.tmpl_skb);
1916         return ret;
1917 }
1918
1919 static void
1920 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1921                                       struct sk_buff *skb)
1922 {
1923         struct ieee80211_tdls_data *tf = (void *)skb->data;
1924         struct wiphy *wiphy = sdata->local->hw.wiphy;
1925
1926         ASSERT_RTNL();
1927
1928         /* make sure the driver supports it */
1929         if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1930                 return;
1931
1932         /* we want to access the entire packet */
1933         if (skb_linearize(skb))
1934                 return;
1935         /*
1936          * The packet/size was already validated by mac80211 Rx path, only look
1937          * at the action type.
1938          */
1939         switch (tf->action_code) {
1940         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1941                 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1942                 break;
1943         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1944                 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1945                 break;
1946         default:
1947                 WARN_ON_ONCE(1);
1948                 return;
1949         }
1950 }
1951
1952 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1953 {
1954         struct sta_info *sta;
1955         u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1956
1957         rcu_read_lock();
1958         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1959                 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1960                     !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1961                         continue;
1962
1963                 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1964                                             NL80211_TDLS_TEARDOWN, reason,
1965                                             GFP_ATOMIC);
1966         }
1967         rcu_read_unlock();
1968 }
1969
1970 void ieee80211_tdls_chsw_work(struct work_struct *wk)
1971 {
1972         struct ieee80211_local *local =
1973                 container_of(wk, struct ieee80211_local, tdls_chsw_work);
1974         struct ieee80211_sub_if_data *sdata;
1975         struct sk_buff *skb;
1976         struct ieee80211_tdls_data *tf;
1977
1978         rtnl_lock();
1979         while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) {
1980                 tf = (struct ieee80211_tdls_data *)skb->data;
1981                 list_for_each_entry(sdata, &local->interfaces, list) {
1982                         if (!ieee80211_sdata_running(sdata) ||
1983                             sdata->vif.type != NL80211_IFTYPE_STATION ||
1984                             !ether_addr_equal(tf->da, sdata->vif.addr))
1985                                 continue;
1986
1987                         ieee80211_process_tdls_channel_switch(sdata, skb);
1988                         break;
1989                 }
1990
1991                 kfree_skb(skb);
1992         }
1993         rtnl_unlock();
1994 }