net/mac80211/tdls.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * mac80211 TDLS handling code
   4  *
   5  * Copyright 2006-2010  Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2014, Intel Corporation
   7  * Copyright 2014  Intel Mobile Communications GmbH
   8  * Copyright 2015 - 2016 Intel Deutschland GmbH
   9  * Copyright (C) 2019, 2021-2022 Intel Corporation
  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         bool buffer_sta = ieee80211_hw_check(&local->hw,
  52                                              SUPPORTS_TDLS_BUFFER_STA);
  53         struct ieee80211_supported_band *sband = ieee80211_get_sband(sdata);
  54         bool vht = sband && sband->vht_cap.vht_supported;
  55         u8 *pos = skb_put(skb, 10);
  56
  57         *pos++ = WLAN_EID_EXT_CAPABILITY;
  58         *pos++ = 8; /* len */
  59         *pos++ = 0x0;
  60         *pos++ = 0x0;
  61         *pos++ = 0x0;
  62         *pos++ = (chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0) |
  63                  (buffer_sta ? WLAN_EXT_CAPA4_TDLS_BUFFER_STA : 0);
  64         *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
  65         *pos++ = 0;
  66         *pos++ = 0;
  67         *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
  68 }
  69
  70 static u8
  71 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
  72                            struct sk_buff *skb, u16 start, u16 end,
  73                            u16 spacing)
  74 {
  75         u8 subband_cnt = 0, ch_cnt = 0;
  76         struct ieee80211_channel *ch;
  77         struct cfg80211_chan_def chandef;
  78         int i, subband_start;
  79         struct wiphy *wiphy = sdata->local->hw.wiphy;
  80
  81         for (i = start; i <= end; i += spacing) {
  82                 if (!ch_cnt)
  83                         subband_start = i;
  84
  85                 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
  86                 if (ch) {
  87                         /* we will be active on the channel */
  88                         cfg80211_chandef_create(&chandef, ch,
  89                                                 NL80211_CHAN_NO_HT);
  90                         if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
  91                                                           sdata->wdev.iftype)) {
  92                                 ch_cnt++;
  93                                 /*
  94                                  * check if the next channel is also part of
  95                                  * this allowed range
  96                                  */
  97                                 continue;
  98                         }
  99                 }
 100
 101                 /*
 102                  * we've reached the end of a range, with allowed channels
 103                  * found
 104                  */
 105                 if (ch_cnt) {
 106                         u8 *pos = skb_put(skb, 2);
 107                         *pos++ = ieee80211_frequency_to_channel(subband_start);
 108                         *pos++ = ch_cnt;
 109
 110                         subband_cnt++;
 111                         ch_cnt = 0;
 112                 }
 113         }
 114
 115         /* all channels in the requested range are allowed - add them here */
 116         if (ch_cnt) {
 117                 u8 *pos = skb_put(skb, 2);
 118                 *pos++ = ieee80211_frequency_to_channel(subband_start);
 119                 *pos++ = ch_cnt;
 120
 121                 subband_cnt++;
 122         }
 123
 124         return subband_cnt;
 125 }
 126
 127 static void
 128 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
 129                                  struct sk_buff *skb)
 130 {
 131         /*
 132          * Add possible channels for TDLS. These are channels that are allowed
 133          * to be active.
 134          */
 135         u8 subband_cnt;
 136         u8 *pos = skb_put(skb, 2);
 137
 138         *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 139
 140         /*
 141          * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
 142          * this doesn't happen in real world scenarios.
 143          */
 144
 145         /* 2GHz, with 5MHz spacing */
 146         subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
 147
 148         /* 5GHz, with 20MHz spacing */
 149         subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
 150
 151         /* length */
 152         *pos = 2 * subband_cnt;
 153 }
 154
 155 static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata,
 156                                             struct sk_buff *skb)
 157 {
 158         u8 *pos;
 159         u8 op_class;
 160
 161         if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef,
 162                                                   &op_class))
 163                 return;
 164
 165         pos = skb_put(skb, 4);
 166         *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
 167         *pos++ = 2; /* len */
 168
 169         *pos++ = op_class;
 170         *pos++ = op_class; /* give current operating class as alternate too */
 171 }
 172
 173 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
 174 {
 175         u8 *pos = skb_put(skb, 3);
 176
 177         *pos++ = WLAN_EID_BSS_COEX_2040;
 178         *pos++ = 1; /* len */
 179
 180         *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
 181 }
 182
 183 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
 184                                         u16 status_code)
 185 {
 186         struct ieee80211_supported_band *sband;
 187
 188         /* The capability will be 0 when sending a failure code */
 189         if (status_code != 0)
 190                 return 0;
 191
 192         sband = ieee80211_get_sband(sdata);
 193         if (sband && sband->band == NL80211_BAND_2GHZ) {
 194                 return WLAN_CAPABILITY_SHORT_SLOT_TIME |
 195                        WLAN_CAPABILITY_SHORT_PREAMBLE;
 196         }
 197
 198         return 0;
 199 }
 200
 201 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
 202                                        struct sk_buff *skb, const u8 *peer,
 203                                        bool initiator)
 204 {
 205         struct ieee80211_tdls_lnkie *lnkid;
 206         const u8 *init_addr, *rsp_addr;
 207
 208         if (initiator) {
 209                 init_addr = sdata->vif.addr;
 210                 rsp_addr = peer;
 211         } else {
 212                 init_addr = peer;
 213                 rsp_addr = sdata->vif.addr;
 214         }
 215
 216         lnkid = skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
 217
 218         lnkid->ie_type = WLAN_EID_LINK_ID;
 219         lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
 220
 221         memcpy(lnkid->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN);
 222         memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
 223         memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
 224 }
 225
 226 static void
 227 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 228 {
 229         u8 *pos = skb_put(skb, 4);
 230
 231         *pos++ = WLAN_EID_AID;
 232         *pos++ = 2; /* len */
 233         put_unaligned_le16(sdata->vif.cfg.aid, pos);
 234 }
 235
 236 /* translate numbering in the WMM parameter IE to the mac80211 notation */
 237 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
 238 {
 239         switch (ac) {
 240         default:
 241                 WARN_ON_ONCE(1);
 242                 fallthrough;
 243         case 0:
 244                 return IEEE80211_AC_BE;
 245         case 1:
 246                 return IEEE80211_AC_BK;
 247         case 2:
 248                 return IEEE80211_AC_VI;
 249         case 3:
 250                 return IEEE80211_AC_VO;
 251         }
 252 }
 253
 254 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
 255 {
 256         u8 ret;
 257
 258         ret = aifsn & 0x0f;
 259         if (acm)
 260                 ret |= 0x10;
 261         ret |= (aci << 5) & 0x60;
 262         return ret;
 263 }
 264
 265 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
 266 {
 267         return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
 268                ((ilog2(cw_max + 1) << 0x4) & 0xf0);
 269 }
 270
 271 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
 272                                             struct sk_buff *skb)
 273 {
 274         struct ieee80211_wmm_param_ie *wmm;
 275         struct ieee80211_tx_queue_params *txq;
 276         int i;
 277
 278         wmm = skb_put_zero(skb, sizeof(*wmm));
 279
 280         wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
 281         wmm->len = sizeof(*wmm) - 2;
 282
 283         wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
 284         wmm->oui[1] = 0x50;
 285         wmm->oui[2] = 0xf2;
 286         wmm->oui_type = 2; /* WME */
 287         wmm->oui_subtype = 1; /* WME param */
 288         wmm->version = 1; /* WME ver */
 289         wmm->qos_info = 0; /* U-APSD not in use */
 290
 291         /*
 292          * Use the EDCA parameters defined for the BSS, or default if the AP
 293          * doesn't support it, as mandated by 802.11-2012 section 10.22.4
 294          */
 295         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 296                 txq = &sdata->deflink.tx_conf[ieee80211_ac_from_wmm(i)];
 297                 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
 298                                                                txq->acm, i);
 299                 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
 300                 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
 301         }
 302 }
 303
 304 static void
 305 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
 306                                    struct sta_info *sta)
 307 {
 308         /* IEEE802.11ac-2013 Table E-4 */
 309         u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
 310         struct cfg80211_chan_def uc = sta->tdls_chandef;
 311         enum nl80211_chan_width max_width =
 312                 ieee80211_sta_cap_chan_bw(&sta->deflink);
 313         int i;
 314
 315         /* only support upgrading non-narrow channels up to 80Mhz */
 316         if (max_width == NL80211_CHAN_WIDTH_5 ||
 317             max_width == NL80211_CHAN_WIDTH_10)
 318                 return;
 319
 320         if (max_width > NL80211_CHAN_WIDTH_80)
 321                 max_width = NL80211_CHAN_WIDTH_80;
 322
 323         if (uc.width >= max_width)
 324                 return;
 325         /*
 326          * Channel usage constrains in the IEEE802.11ac-2013 specification only
 327          * allow expanding a 20MHz channel to 80MHz in a single way. In
 328          * addition, there are no 40MHz allowed channels that are not part of
 329          * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
 330          */
 331         for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
 332                 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
 333                         uc.center_freq1 = centers_80mhz[i];
 334                         uc.center_freq2 = 0;
 335                         uc.width = NL80211_CHAN_WIDTH_80;
 336                         break;
 337                 }
 338
 339         if (!uc.center_freq1)
 340                 return;
 341
 342         /* proceed to downgrade the chandef until usable or the same as AP BW */
 343         while (uc.width > max_width ||
 344                (uc.width > sta->tdls_chandef.width &&
 345                 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
 346                                                sdata->wdev.iftype)))
 347                 ieee80211_chandef_downgrade(&uc);
 348
 349         if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
 350                 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
 351                          sta->tdls_chandef.width, uc.width);
 352
 353                 /*
 354                  * the station is not yet authorized when BW upgrade is done,
 355                  * locking is not required
 356                  */
 357                 sta->tdls_chandef = uc;
 358         }
 359 }
 360
 361 static void
 362 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
 363                                    struct sk_buff *skb, const u8 *peer,
 364                                    u8 action_code, bool initiator,
 365                                    const u8 *extra_ies, size_t extra_ies_len)
 366 {
 367         struct ieee80211_supported_band *sband;
 368         struct ieee80211_local *local = sdata->local;
 369         struct ieee80211_sta_ht_cap ht_cap;
 370         struct ieee80211_sta_vht_cap vht_cap;
 371         struct sta_info *sta = NULL;
 372         size_t offset = 0, noffset;
 373         u8 *pos;
 374
 375         sband = ieee80211_get_sband(sdata);
 376         if (!sband)
 377                 return;
 378
 379         ieee80211_add_srates_ie(sdata, skb, false, sband->band);
 380         ieee80211_add_ext_srates_ie(sdata, skb, false, sband->band);
 381         ieee80211_tdls_add_supp_channels(sdata, skb);
 382
 383         /* add any custom IEs that go before Extended Capabilities */
 384         if (extra_ies_len) {
 385                 static const u8 before_ext_cap[] = {
 386                         WLAN_EID_SUPP_RATES,
 387                         WLAN_EID_COUNTRY,
 388                         WLAN_EID_EXT_SUPP_RATES,
 389                         WLAN_EID_SUPPORTED_CHANNELS,
 390                         WLAN_EID_RSN,
 391                 };
 392                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 393                                              before_ext_cap,
 394                                              ARRAY_SIZE(before_ext_cap),
 395                                              offset);
 396                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 397                 offset = noffset;
 398         }
 399
 400         ieee80211_tdls_add_ext_capab(sdata, skb);
 401
 402         /* add the QoS element if we support it */
 403         if (local->hw.queues >= IEEE80211_NUM_ACS &&
 404             action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
 405                 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
 406
 407         /* add any custom IEs that go before HT capabilities */
 408         if (extra_ies_len) {
 409                 static const u8 before_ht_cap[] = {
 410                         WLAN_EID_SUPP_RATES,
 411                         WLAN_EID_COUNTRY,
 412                         WLAN_EID_EXT_SUPP_RATES,
 413                         WLAN_EID_SUPPORTED_CHANNELS,
 414                         WLAN_EID_RSN,
 415                         WLAN_EID_EXT_CAPABILITY,
 416                         WLAN_EID_QOS_CAPA,
 417                         WLAN_EID_FAST_BSS_TRANSITION,
 418                         WLAN_EID_TIMEOUT_INTERVAL,
 419                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 420                 };
 421                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 422                                              before_ht_cap,
 423                                              ARRAY_SIZE(before_ht_cap),
 424                                              offset);
 425                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 426                 offset = noffset;
 427         }
 428
 429         mutex_lock(&local->sta_mtx);
 430
 431         /* we should have the peer STA if we're already responding */
 432         if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
 433                 sta = sta_info_get(sdata, peer);
 434                 if (WARN_ON_ONCE(!sta)) {
 435                         mutex_unlock(&local->sta_mtx);
 436                         return;
 437                 }
 438
 439                 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
 440         }
 441
 442         ieee80211_tdls_add_oper_classes(sdata, skb);
 443
 444         /*
 445          * with TDLS we can switch channels, and HT-caps are not necessarily
 446          * the same on all bands. The specification limits the setup to a
 447          * single HT-cap, so use the current band for now.
 448          */
 449         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 450
 451         if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 452              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 453             ht_cap.ht_supported) {
 454                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 455
 456                 /* disable SMPS in TDLS initiator */
 457                 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
 458                                 << IEEE80211_HT_CAP_SM_PS_SHIFT;
 459
 460                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 461                 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 462         } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 463                    ht_cap.ht_supported && sta->sta.deflink.ht_cap.ht_supported) {
 464                 /* the peer caps are already intersected with our own */
 465                 memcpy(&ht_cap, &sta->sta.deflink.ht_cap, sizeof(ht_cap));
 466
 467                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 468                 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 469         }
 470
 471         if (ht_cap.ht_supported &&
 472             (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
 473                 ieee80211_tdls_add_bss_coex_ie(skb);
 474
 475         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 476
 477         /* add any custom IEs that go before VHT capabilities */
 478         if (extra_ies_len) {
 479                 static const u8 before_vht_cap[] = {
 480                         WLAN_EID_SUPP_RATES,
 481                         WLAN_EID_COUNTRY,
 482                         WLAN_EID_EXT_SUPP_RATES,
 483                         WLAN_EID_SUPPORTED_CHANNELS,
 484                         WLAN_EID_RSN,
 485                         WLAN_EID_EXT_CAPABILITY,
 486                         WLAN_EID_QOS_CAPA,
 487                         WLAN_EID_FAST_BSS_TRANSITION,
 488                         WLAN_EID_TIMEOUT_INTERVAL,
 489                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 490                         WLAN_EID_MULTI_BAND,
 491                 };
 492                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 493                                              before_vht_cap,
 494                                              ARRAY_SIZE(before_vht_cap),
 495                                              offset);
 496                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 497                 offset = noffset;
 498         }
 499
 500         /* build the VHT-cap similarly to the HT-cap */
 501         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 502         if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 503              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 504             vht_cap.vht_supported) {
 505                 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 506
 507                 /* the AID is present only when VHT is implemented */
 508                 if (action_code == WLAN_TDLS_SETUP_REQUEST)
 509                         ieee80211_tdls_add_aid(sdata, skb);
 510
 511                 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 512                 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 513         } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 514                    vht_cap.vht_supported && sta->sta.deflink.vht_cap.vht_supported) {
 515                 /* the peer caps are already intersected with our own */
 516                 memcpy(&vht_cap, &sta->sta.deflink.vht_cap, sizeof(vht_cap));
 517
 518                 /* the AID is present only when VHT is implemented */
 519                 ieee80211_tdls_add_aid(sdata, skb);
 520
 521                 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 522                 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 523
 524                 /*
 525                  * if both peers support WIDER_BW, we can expand the chandef to
 526                  * a wider compatible one, up to 80MHz
 527                  */
 528                 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 529                         ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 530         }
 531
 532         mutex_unlock(&local->sta_mtx);
 533
 534         /* add any remaining IEs */
 535         if (extra_ies_len) {
 536                 noffset = extra_ies_len;
 537                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 538         }
 539
 540 }
 541
 542 static void
 543 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
 544                                  struct sk_buff *skb, const u8 *peer,
 545                                  bool initiator, const u8 *extra_ies,
 546                                  size_t extra_ies_len)
 547 {
 548         struct ieee80211_local *local = sdata->local;
 549         size_t offset = 0, noffset;
 550         struct sta_info *sta, *ap_sta;
 551         struct ieee80211_supported_band *sband;
 552         u8 *pos;
 553
 554         sband = ieee80211_get_sband(sdata);
 555         if (!sband)
 556                 return;
 557
 558         mutex_lock(&local->sta_mtx);
 559
 560         sta = sta_info_get(sdata, peer);
 561         ap_sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid);
 562         if (WARN_ON_ONCE(!sta || !ap_sta)) {
 563                 mutex_unlock(&local->sta_mtx);
 564                 return;
 565         }
 566
 567         sta->tdls_chandef = sdata->vif.bss_conf.chandef;
 568
 569         /* add any custom IEs that go before the QoS IE */
 570         if (extra_ies_len) {
 571                 static const u8 before_qos[] = {
 572                         WLAN_EID_RSN,
 573                 };
 574                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 575                                              before_qos,
 576                                              ARRAY_SIZE(before_qos),
 577                                              offset);
 578                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 579                 offset = noffset;
 580         }
 581
 582         /* add the QoS param IE if both the peer and we support it */
 583         if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
 584                 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
 585
 586         /* add any custom IEs that go before HT operation */
 587         if (extra_ies_len) {
 588                 static const u8 before_ht_op[] = {
 589                         WLAN_EID_RSN,
 590                         WLAN_EID_QOS_CAPA,
 591                         WLAN_EID_FAST_BSS_TRANSITION,
 592                         WLAN_EID_TIMEOUT_INTERVAL,
 593                 };
 594                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 595                                              before_ht_op,
 596                                              ARRAY_SIZE(before_ht_op),
 597                                              offset);
 598                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 599                 offset = noffset;
 600         }
 601
 602         /*
 603          * if HT support is only added in TDLS, we need an HT-operation IE.
 604          * add the IE as required by IEEE802.11-2012 9.23.3.2.
 605          */
 606         if (!ap_sta->sta.deflink.ht_cap.ht_supported && sta->sta.deflink.ht_cap.ht_supported) {
 607                 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
 608                            IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
 609                            IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
 610
 611                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 612                 ieee80211_ie_build_ht_oper(pos, &sta->sta.deflink.ht_cap,
 613                                            &sdata->vif.bss_conf.chandef, prot,
 614                                            true);
 615         }
 616
 617         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 618
 619         /* only include VHT-operation if not on the 2.4GHz band */
 620         if (sband->band != NL80211_BAND_2GHZ &&
 621             sta->sta.deflink.vht_cap.vht_supported) {
 622                 /*
 623                  * if both peers support WIDER_BW, we can expand the chandef to
 624                  * a wider compatible one, up to 80MHz
 625                  */
 626                 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 627                         ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 628
 629                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 630                 ieee80211_ie_build_vht_oper(pos, &sta->sta.deflink.vht_cap,
 631                                             &sta->tdls_chandef);
 632         }
 633
 634         mutex_unlock(&local->sta_mtx);
 635
 636         /* add any remaining IEs */
 637         if (extra_ies_len) {
 638                 noffset = extra_ies_len;
 639                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 640         }
 641 }
 642
 643 static void
 644 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
 645                                        struct sk_buff *skb, const u8 *peer,
 646                                        bool initiator, const u8 *extra_ies,
 647                                        size_t extra_ies_len, u8 oper_class,
 648                                        struct cfg80211_chan_def *chandef)
 649 {
 650         struct ieee80211_tdls_data *tf;
 651         size_t offset = 0, noffset;
 652
 653         if (WARN_ON_ONCE(!chandef))
 654                 return;
 655
 656         tf = (void *)skb->data;
 657         tf->u.chan_switch_req.target_channel =
 658                 ieee80211_frequency_to_channel(chandef->chan->center_freq);
 659         tf->u.chan_switch_req.oper_class = oper_class;
 660
 661         if (extra_ies_len) {
 662                 static const u8 before_lnkie[] = {
 663                         WLAN_EID_SECONDARY_CHANNEL_OFFSET,
 664                 };
 665                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 666                                              before_lnkie,
 667                                              ARRAY_SIZE(before_lnkie),
 668                                              offset);
 669                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 670                 offset = noffset;
 671         }
 672
 673         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 674
 675         /* add any remaining IEs */
 676         if (extra_ies_len) {
 677                 noffset = extra_ies_len;
 678                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 679         }
 680 }
 681
 682 static void
 683 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
 684                                         struct sk_buff *skb, const u8 *peer,
 685                                         u16 status_code, bool initiator,
 686                                         const u8 *extra_ies,
 687                                         size_t extra_ies_len)
 688 {
 689         if (status_code == 0)
 690                 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 691
 692         if (extra_ies_len)
 693                 skb_put_data(skb, extra_ies, extra_ies_len);
 694 }
 695
 696 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
 697                                    struct sk_buff *skb, const u8 *peer,
 698                                    u8 action_code, u16 status_code,
 699                                    bool initiator, const u8 *extra_ies,
 700                                    size_t extra_ies_len, u8 oper_class,
 701                                    struct cfg80211_chan_def *chandef)
 702 {
 703         switch (action_code) {
 704         case WLAN_TDLS_SETUP_REQUEST:
 705         case WLAN_TDLS_SETUP_RESPONSE:
 706         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 707                 if (status_code == 0)
 708                         ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
 709                                                            action_code,
 710                                                            initiator,
 711                                                            extra_ies,
 712                                                            extra_ies_len);
 713                 break;
 714         case WLAN_TDLS_SETUP_CONFIRM:
 715                 if (status_code == 0)
 716                         ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
 717                                                          initiator, extra_ies,
 718                                                          extra_ies_len);
 719                 break;
 720         case WLAN_TDLS_TEARDOWN:
 721         case WLAN_TDLS_DISCOVERY_REQUEST:
 722                 if (extra_ies_len)
 723                         skb_put_data(skb, extra_ies, extra_ies_len);
 724                 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
 725                         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 726                 break;
 727         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 728                 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
 729                                                        initiator, extra_ies,
 730                                                        extra_ies_len,
 731                                                        oper_class, chandef);
 732                 break;
 733         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 734                 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
 735                                                         status_code,
 736                                                         initiator, extra_ies,
 737                                                         extra_ies_len);
 738                 break;
 739         }
 740
 741 }
 742
 743 static int
 744 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
 745                                const u8 *peer, u8 action_code, u8 dialog_token,
 746                                u16 status_code, struct sk_buff *skb)
 747 {
 748         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 749         struct ieee80211_tdls_data *tf;
 750
 751         tf = skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
 752
 753         memcpy(tf->da, peer, ETH_ALEN);
 754         memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
 755         tf->ether_type = cpu_to_be16(ETH_P_TDLS);
 756         tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
 757
 758         /* network header is after the ethernet header */
 759         skb_set_network_header(skb, ETH_HLEN);
 760
 761         switch (action_code) {
 762         case WLAN_TDLS_SETUP_REQUEST:
 763                 tf->category = WLAN_CATEGORY_TDLS;
 764                 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
 765
 766                 skb_put(skb, sizeof(tf->u.setup_req));
 767                 tf->u.setup_req.dialog_token = dialog_token;
 768                 tf->u.setup_req.capability =
 769                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 770                                                                  status_code));
 771                 break;
 772         case WLAN_TDLS_SETUP_RESPONSE:
 773                 tf->category = WLAN_CATEGORY_TDLS;
 774                 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
 775
 776                 skb_put(skb, sizeof(tf->u.setup_resp));
 777                 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
 778                 tf->u.setup_resp.dialog_token = dialog_token;
 779                 tf->u.setup_resp.capability =
 780                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 781                                                                  status_code));
 782                 break;
 783         case WLAN_TDLS_SETUP_CONFIRM:
 784                 tf->category = WLAN_CATEGORY_TDLS;
 785                 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
 786
 787                 skb_put(skb, sizeof(tf->u.setup_cfm));
 788                 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
 789                 tf->u.setup_cfm.dialog_token = dialog_token;
 790                 break;
 791         case WLAN_TDLS_TEARDOWN:
 792                 tf->category = WLAN_CATEGORY_TDLS;
 793                 tf->action_code = WLAN_TDLS_TEARDOWN;
 794
 795                 skb_put(skb, sizeof(tf->u.teardown));
 796                 tf->u.teardown.reason_code = cpu_to_le16(status_code);
 797                 break;
 798         case WLAN_TDLS_DISCOVERY_REQUEST:
 799                 tf->category = WLAN_CATEGORY_TDLS;
 800                 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
 801
 802                 skb_put(skb, sizeof(tf->u.discover_req));
 803                 tf->u.discover_req.dialog_token = dialog_token;
 804                 break;
 805         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 806                 tf->category = WLAN_CATEGORY_TDLS;
 807                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
 808
 809                 skb_put(skb, sizeof(tf->u.chan_switch_req));
 810                 break;
 811         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 812                 tf->category = WLAN_CATEGORY_TDLS;
 813                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
 814
 815                 skb_put(skb, sizeof(tf->u.chan_switch_resp));
 816                 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
 817                 break;
 818         default:
 819                 return -EINVAL;
 820         }
 821
 822         return 0;
 823 }
 824
 825 static int
 826 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
 827                            const u8 *peer, u8 action_code, u8 dialog_token,
 828                            u16 status_code, struct sk_buff *skb)
 829 {
 830         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 831         struct ieee80211_mgmt *mgmt;
 832
 833         mgmt = skb_put_zero(skb, 24);
 834         memcpy(mgmt->da, peer, ETH_ALEN);
 835         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 836         memcpy(mgmt->bssid, sdata->deflink.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                 fallthrough;
 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                 fallthrough;
 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->priority = 256 + 2;
1014                 break;
1015         default:
1016                 skb->priority = 256 + 5;
1017                 break;
1018         }
1019
1020         /*
1021          * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1022          * Later, if no ACK is returned from peer, we will re-send the teardown
1023          * packet through the AP.
1024          */
1025         if ((action_code == WLAN_TDLS_TEARDOWN) &&
1026             ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1027                 bool try_resend; /* Should we keep skb for possible resend */
1028
1029                 /* If not sending directly to peer - no point in keeping skb */
1030                 rcu_read_lock();
1031                 sta = sta_info_get(sdata, peer);
1032                 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1033                 rcu_read_unlock();
1034
1035                 spin_lock_bh(&sdata->u.mgd.teardown_lock);
1036                 if (try_resend && !sdata->u.mgd.teardown_skb) {
1037                         /* Mark it as requiring TX status callback  */
1038                         flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1039                                  IEEE80211_TX_INTFL_MLME_CONN_TX;
1040
1041                         /*
1042                          * skb is copied since mac80211 will later set
1043                          * properties that might not be the same as the AP,
1044                          * such as encryption, QoS, addresses, etc.
1045                          *
1046                          * No problem if skb_copy() fails, so no need to check.
1047                          */
1048                         sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1049                         sdata->u.mgd.orig_teardown_skb = skb;
1050                 }
1051                 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1052         }
1053
1054         /* disable bottom halves when entering the Tx path */
1055         local_bh_disable();
1056         __ieee80211_subif_start_xmit(skb, dev, flags,
1057                                      IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL);
1058         local_bh_enable();
1059
1060         return ret;
1061
1062 fail:
1063         dev_kfree_skb(skb);
1064         return ret;
1065 }
1066
1067 static int
1068 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1069                           const u8 *peer, u8 action_code, u8 dialog_token,
1070                           u16 status_code, u32 peer_capability, bool initiator,
1071                           const u8 *extra_ies, size_t extra_ies_len)
1072 {
1073         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1074         struct ieee80211_local *local = sdata->local;
1075         enum ieee80211_smps_mode smps_mode =
1076                 sdata->deflink.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                 fallthrough;
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.bss_conf.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->deflink));
1273                         if (bw != sta->sta.deflink.bandwidth) {
1274                                 sta->sta.deflink.bandwidth = bw;
1275                                 rate_control_rate_update(local, sband, sta, 0,
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.deflink.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         bool tdls_ht;
1315         u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1316                          IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1317                          IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1318         u16 opmode;
1319
1320         /* Nothing to do if the BSS connection uses HT */
1321         if (!(sdata->deflink.u.mgd.conn_flags & IEEE80211_CONN_DISABLE_HT))
1322                 return;
1323
1324         tdls_ht = (sta && sta->sta.deflink.ht_cap.ht_supported) ||
1325                   iee80211_tdls_have_ht_peers(sdata);
1326
1327         opmode = sdata->vif.bss_conf.ht_operation_mode;
1328
1329         if (tdls_ht)
1330                 opmode |= protection;
1331         else
1332                 opmode &= ~protection;
1333
1334         if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1335                 return;
1336
1337         sdata->vif.bss_conf.ht_operation_mode = opmode;
1338         ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1339                                           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.bss_conf.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->deflink.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->cfg.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         if (chandef->chan->freq_offset)
1571                 /* this may work, but is untested */
1572                 return -EOPNOTSUPP;
1573
1574         mutex_lock(&local->sta_mtx);
1575         sta = sta_info_get(sdata, addr);
1576         if (!sta) {
1577                 tdls_dbg(sdata,
1578                          "Invalid TDLS peer %pM for channel switch request\n",
1579                          addr);
1580                 ret = -ENOENT;
1581                 goto out;
1582         }
1583
1584         if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1585                 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1586                          addr);
1587                 ret = -ENOTSUPP;
1588                 goto out;
1589         }
1590
1591         skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1592                                             &ch_sw_tm_ie);
1593         if (!skb) {
1594                 ret = -ENOENT;
1595                 goto out;
1596         }
1597
1598         ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1599                                       chandef, skb, ch_sw_tm_ie);
1600         if (!ret)
1601                 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1602
1603 out:
1604         mutex_unlock(&local->sta_mtx);
1605         dev_kfree_skb_any(skb);
1606         return ret;
1607 }
1608
1609 void
1610 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1611                                      struct net_device *dev,
1612                                      const u8 *addr)
1613 {
1614         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1615         struct ieee80211_local *local = sdata->local;
1616         struct sta_info *sta;
1617
1618         mutex_lock(&local->sta_mtx);
1619         sta = sta_info_get(sdata, addr);
1620         if (!sta) {
1621                 tdls_dbg(sdata,
1622                          "Invalid TDLS peer %pM for channel switch cancel\n",
1623                          addr);
1624                 goto out;
1625         }
1626
1627         if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1628                 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1629                          addr);
1630                 goto out;
1631         }
1632
1633         drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1634         clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1635
1636 out:
1637         mutex_unlock(&local->sta_mtx);
1638 }
1639
1640 static struct sk_buff *
1641 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1642                                    u32 *ch_sw_tm_ie_offset)
1643 {
1644         struct ieee80211_sub_if_data *sdata = sta->sdata;
1645         struct sk_buff *skb;
1646         u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1647
1648         /* initial timing are always zero in the template */
1649         iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1650
1651         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1652                                         WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1653                                         0, 0, !sta->sta.tdls_initiator,
1654                                         extra_ies, sizeof(extra_ies), 0, NULL);
1655         if (!skb)
1656                 return NULL;
1657
1658         skb = ieee80211_build_data_template(sdata, skb, 0);
1659         if (IS_ERR(skb)) {
1660                 tdls_dbg(sdata,
1661                          "Failed building TDLS channel switch resp frame\n");
1662                 return NULL;
1663         }
1664
1665         if (ch_sw_tm_ie_offset) {
1666                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1667
1668                 if (!tm_ie) {
1669                         tdls_dbg(sdata,
1670                                  "No switch timing IE in TDLS switch resp\n");
1671                         dev_kfree_skb_any(skb);
1672                         return NULL;
1673                 }
1674
1675                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1676         }
1677
1678         tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1679                  sta->sta.addr);
1680         return skb;
1681 }
1682
1683 static int
1684 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1685                                            struct sk_buff *skb)
1686 {
1687         struct ieee80211_local *local = sdata->local;
1688         struct ieee802_11_elems *elems = NULL;
1689         struct sta_info *sta;
1690         struct ieee80211_tdls_data *tf = (void *)skb->data;
1691         bool local_initiator;
1692         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1693         int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1694         struct ieee80211_tdls_ch_sw_params params = {};
1695         int ret;
1696
1697         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1698         params.timestamp = rx_status->device_timestamp;
1699
1700         if (skb->len < baselen) {
1701                 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1702                          skb->len);
1703                 return -EINVAL;
1704         }
1705
1706         mutex_lock(&local->sta_mtx);
1707         sta = sta_info_get(sdata, tf->sa);
1708         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1709                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1710                          tf->sa);
1711                 ret = -EINVAL;
1712                 goto out;
1713         }
1714
1715         params.sta = &sta->sta;
1716         params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1717         if (params.status != 0) {
1718                 ret = 0;
1719                 goto call_drv;
1720         }
1721
1722         elems = ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1723                                        skb->len - baselen, false, NULL);
1724         if (!elems) {
1725                 ret = -ENOMEM;
1726                 goto out;
1727         }
1728
1729         if (elems->parse_error) {
1730                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1731                 ret = -EINVAL;
1732                 goto out;
1733         }
1734
1735         if (!elems->ch_sw_timing || !elems->lnk_id) {
1736                 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1737                 ret = -EINVAL;
1738                 goto out;
1739         }
1740
1741         /* validate the initiator is set correctly */
1742         local_initiator =
1743                 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1744         if (local_initiator == sta->sta.tdls_initiator) {
1745                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1746                 ret = -EINVAL;
1747                 goto out;
1748         }
1749
1750         params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time);
1751         params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout);
1752
1753         params.tmpl_skb =
1754                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1755         if (!params.tmpl_skb) {
1756                 ret = -ENOENT;
1757                 goto out;
1758         }
1759
1760         ret = 0;
1761 call_drv:
1762         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1763
1764         tdls_dbg(sdata,
1765                  "TDLS channel switch response received from %pM status %d\n",
1766                  tf->sa, params.status);
1767
1768 out:
1769         mutex_unlock(&local->sta_mtx);
1770         dev_kfree_skb_any(params.tmpl_skb);
1771         kfree(elems);
1772         return ret;
1773 }
1774
1775 static int
1776 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1777                                           struct sk_buff *skb)
1778 {
1779         struct ieee80211_local *local = sdata->local;
1780         struct ieee802_11_elems *elems;
1781         struct cfg80211_chan_def chandef;
1782         struct ieee80211_channel *chan;
1783         enum nl80211_channel_type chan_type;
1784         int freq;
1785         u8 target_channel, oper_class;
1786         bool local_initiator;
1787         struct sta_info *sta;
1788         enum nl80211_band band;
1789         struct ieee80211_tdls_data *tf = (void *)skb->data;
1790         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1791         int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1792         struct ieee80211_tdls_ch_sw_params params = {};
1793         int ret = 0;
1794
1795         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1796         params.timestamp = rx_status->device_timestamp;
1797
1798         if (skb->len < baselen) {
1799                 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1800                          skb->len);
1801                 return -EINVAL;
1802         }
1803
1804         target_channel = tf->u.chan_switch_req.target_channel;
1805         oper_class = tf->u.chan_switch_req.oper_class;
1806
1807         /*
1808          * We can't easily infer the channel band. The operating class is
1809          * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1810          * solution here is to treat channels with number >14 as 5GHz ones,
1811          * and specifically check for the (oper_class, channel) combinations
1812          * where this doesn't hold. These are thankfully unique according to
1813          * IEEE802.11-2012.
1814          * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1815          * valid here.
1816          */
1817         if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1818              oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1819              target_channel < 14)
1820                 band = NL80211_BAND_5GHZ;
1821         else
1822                 band = target_channel < 14 ? NL80211_BAND_2GHZ :
1823                                              NL80211_BAND_5GHZ;
1824
1825         freq = ieee80211_channel_to_frequency(target_channel, band);
1826         if (freq == 0) {
1827                 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1828                          target_channel);
1829                 return -EINVAL;
1830         }
1831
1832         chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1833         if (!chan) {
1834                 tdls_dbg(sdata,
1835                          "Unsupported channel for TDLS chan switch: %d\n",
1836                          target_channel);
1837                 return -EINVAL;
1838         }
1839
1840         elems = ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1841                                        skb->len - baselen, false, NULL);
1842         if (!elems)
1843                 return -ENOMEM;
1844
1845         if (elems->parse_error) {
1846                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1847                 ret = -EINVAL;
1848                 goto free;
1849         }
1850
1851         if (!elems->ch_sw_timing || !elems->lnk_id) {
1852                 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1853                 ret = -EINVAL;
1854                 goto free;
1855         }
1856
1857         if (!elems->sec_chan_offs) {
1858                 chan_type = NL80211_CHAN_HT20;
1859         } else {
1860                 switch (elems->sec_chan_offs->sec_chan_offs) {
1861                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1862                         chan_type = NL80211_CHAN_HT40PLUS;
1863                         break;
1864                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1865                         chan_type = NL80211_CHAN_HT40MINUS;
1866                         break;
1867                 default:
1868                         chan_type = NL80211_CHAN_HT20;
1869                         break;
1870                 }
1871         }
1872
1873         cfg80211_chandef_create(&chandef, chan, chan_type);
1874
1875         /* we will be active on the TDLS link */
1876         if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1877                                            sdata->wdev.iftype)) {
1878                 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1879                 ret = -EINVAL;
1880                 goto free;
1881         }
1882
1883         mutex_lock(&local->sta_mtx);
1884         sta = sta_info_get(sdata, tf->sa);
1885         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1886                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1887                          tf->sa);
1888                 ret = -EINVAL;
1889                 goto out;
1890         }
1891
1892         params.sta = &sta->sta;
1893
1894         /* validate the initiator is set correctly */
1895         local_initiator =
1896                 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1897         if (local_initiator == sta->sta.tdls_initiator) {
1898                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1899                 ret = -EINVAL;
1900                 goto out;
1901         }
1902
1903         /* peer should have known better */
1904         if (!sta->sta.deflink.ht_cap.ht_supported && elems->sec_chan_offs &&
1905             elems->sec_chan_offs->sec_chan_offs) {
1906                 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1907                 ret = -ENOTSUPP;
1908                 goto out;
1909         }
1910
1911         params.chandef = &chandef;
1912         params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time);
1913         params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout);
1914
1915         params.tmpl_skb =
1916                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1917                                                    &params.ch_sw_tm_ie);
1918         if (!params.tmpl_skb) {
1919                 ret = -ENOENT;
1920                 goto out;
1921         }
1922
1923         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1924
1925         tdls_dbg(sdata,
1926                  "TDLS ch switch request received from %pM ch %d width %d\n",
1927                  tf->sa, params.chandef->chan->center_freq,
1928                  params.chandef->width);
1929 out:
1930         mutex_unlock(&local->sta_mtx);
1931         dev_kfree_skb_any(params.tmpl_skb);
1932 free:
1933         kfree(elems);
1934         return ret;
1935 }
1936
1937 void
1938 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1939                                       struct sk_buff *skb)
1940 {
1941         struct ieee80211_tdls_data *tf = (void *)skb->data;
1942         struct wiphy *wiphy = sdata->local->hw.wiphy;
1943
1944         lockdep_assert_wiphy(wiphy);
1945
1946         /* make sure the driver supports it */
1947         if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1948                 return;
1949
1950         /* we want to access the entire packet */
1951         if (skb_linearize(skb))
1952                 return;
1953         /*
1954          * The packet/size was already validated by mac80211 Rx path, only look
1955          * at the action type.
1956          */
1957         switch (tf->action_code) {
1958         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1959                 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1960                 break;
1961         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1962                 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1963                 break;
1964         default:
1965                 WARN_ON_ONCE(1);
1966                 return;
1967         }
1968 }
1969
1970 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1971 {
1972         struct sta_info *sta;
1973         u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1974
1975         rcu_read_lock();
1976         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1977                 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1978                     !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1979                         continue;
1980
1981                 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1982                                             NL80211_TDLS_TEARDOWN, reason,
1983                                             GFP_ATOMIC);
1984         }
1985         rcu_read_unlock();
1986 }
1987
1988 void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata,
1989                                       const u8 *peer, u16 reason)
1990 {
1991         struct ieee80211_sta *sta;
1992
1993         rcu_read_lock();
1994         sta = ieee80211_find_sta(&sdata->vif, peer);
1995         if (!sta || !sta->tdls) {
1996                 rcu_read_unlock();
1997                 return;
1998         }
1999         rcu_read_unlock();
2000
2001         tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n",
2002                  peer, reason,
2003                  ieee80211_get_reason_code_string(reason));
2004
2005         ieee80211_tdls_oper_request(&sdata->vif, peer,
2006                                     NL80211_TDLS_TEARDOWN,
2007                                     WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE,
2008                                     GFP_ATOMIC);
2009 }