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, 2021-2023 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 wiphy *wiphy, struct wiphy_work *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         lockdep_assert_wiphy(local->hw.wiphy);
  34
  35         if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
  36                 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
  37                 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
  38                 eth_zero_addr(sdata->u.mgd.tdls_peer);
  39         }
  40 }
  41
  42 static void ieee80211_tdls_add_ext_capab(struct ieee80211_link_data *link,
  43                                          struct sk_buff *skb)
  44 {
  45         struct ieee80211_sub_if_data *sdata = link->sdata;
  46         struct ieee80211_local *local = sdata->local;
  47         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  48         bool chan_switch = local->hw.wiphy->features &
  49                            NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
  50         bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
  51                           !ifmgd->tdls_wider_bw_prohibited;
  52         bool buffer_sta = ieee80211_hw_check(&local->hw,
  53                                              SUPPORTS_TDLS_BUFFER_STA);
  54         struct ieee80211_supported_band *sband = ieee80211_get_link_sband(link);
  55         bool vht = sband && sband->vht_cap.vht_supported;
  56         u8 *pos = skb_put(skb, 10);
  57
  58         *pos++ = WLAN_EID_EXT_CAPABILITY;
  59         *pos++ = 8; /* len */
  60         *pos++ = 0x0;
  61         *pos++ = 0x0;
  62         *pos++ = 0x0;
  63         *pos++ = (chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0) |
  64                  (buffer_sta ? WLAN_EXT_CAPA4_TDLS_BUFFER_STA : 0);
  65         *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
  66         *pos++ = 0;
  67         *pos++ = 0;
  68         *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
  69 }
  70
  71 static u8
  72 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
  73                            struct sk_buff *skb, u16 start, u16 end,
  74                            u16 spacing)
  75 {
  76         u8 subband_cnt = 0, ch_cnt = 0;
  77         struct ieee80211_channel *ch;
  78         struct cfg80211_chan_def chandef;
  79         int i, subband_start;
  80         struct wiphy *wiphy = sdata->local->hw.wiphy;
  81
  82         for (i = start; i <= end; i += spacing) {
  83                 if (!ch_cnt)
  84                         subband_start = i;
  85
  86                 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
  87                 if (ch) {
  88                         /* we will be active on the channel */
  89                         cfg80211_chandef_create(&chandef, ch,
  90                                                 NL80211_CHAN_NO_HT);
  91                         if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
  92                                                           sdata->wdev.iftype)) {
  93                                 ch_cnt++;
  94                                 /*
  95                                  * check if the next channel is also part of
  96                                  * this allowed range
  97                                  */
  98                                 continue;
  99                         }
 100                 }
 101
 102                 /*
 103                  * we've reached the end of a range, with allowed channels
 104                  * found
 105                  */
 106                 if (ch_cnt) {
 107                         u8 *pos = skb_put(skb, 2);
 108                         *pos++ = ieee80211_frequency_to_channel(subband_start);
 109                         *pos++ = ch_cnt;
 110
 111                         subband_cnt++;
 112                         ch_cnt = 0;
 113                 }
 114         }
 115
 116         /* all channels in the requested range are allowed - add them here */
 117         if (ch_cnt) {
 118                 u8 *pos = skb_put(skb, 2);
 119                 *pos++ = ieee80211_frequency_to_channel(subband_start);
 120                 *pos++ = ch_cnt;
 121
 122                 subband_cnt++;
 123         }
 124
 125         return subband_cnt;
 126 }
 127
 128 static void
 129 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
 130                                  struct sk_buff *skb)
 131 {
 132         /*
 133          * Add possible channels for TDLS. These are channels that are allowed
 134          * to be active.
 135          */
 136         u8 subband_cnt;
 137         u8 *pos = skb_put(skb, 2);
 138
 139         *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 140
 141         /*
 142          * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
 143          * this doesn't happen in real world scenarios.
 144          */
 145
 146         /* 2GHz, with 5MHz spacing */
 147         subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
 148
 149         /* 5GHz, with 20MHz spacing */
 150         subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
 151
 152         /* length */
 153         *pos = 2 * subband_cnt;
 154 }
 155
 156 static void ieee80211_tdls_add_oper_classes(struct ieee80211_link_data *link,
 157                                             struct sk_buff *skb)
 158 {
 159         u8 *pos;
 160         u8 op_class;
 161
 162         if (!ieee80211_chandef_to_operating_class(&link->conf->chandef,
 163                                                   &op_class))
 164                 return;
 165
 166         pos = skb_put(skb, 4);
 167         *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
 168         *pos++ = 2; /* len */
 169
 170         *pos++ = op_class;
 171         *pos++ = op_class; /* give current operating class as alternate too */
 172 }
 173
 174 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
 175 {
 176         u8 *pos = skb_put(skb, 3);
 177
 178         *pos++ = WLAN_EID_BSS_COEX_2040;
 179         *pos++ = 1; /* len */
 180
 181         *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
 182 }
 183
 184 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_link_data *link,
 185                                         u16 status_code)
 186 {
 187         struct ieee80211_supported_band *sband;
 188
 189         /* The capability will be 0 when sending a failure code */
 190         if (status_code != 0)
 191                 return 0;
 192
 193         sband = ieee80211_get_link_sband(link);
 194
 195         if (sband && sband->band == NL80211_BAND_2GHZ) {
 196                 return WLAN_CAPABILITY_SHORT_SLOT_TIME |
 197                        WLAN_CAPABILITY_SHORT_PREAMBLE;
 198         }
 199
 200         return 0;
 201 }
 202
 203 static void ieee80211_tdls_add_link_ie(struct ieee80211_link_data *link,
 204                                        struct sk_buff *skb, const u8 *peer,
 205                                        bool initiator)
 206 {
 207         struct ieee80211_sub_if_data *sdata = link->sdata;
 208         struct ieee80211_tdls_lnkie *lnkid;
 209         const u8 *init_addr, *rsp_addr;
 210
 211         if (initiator) {
 212                 init_addr = sdata->vif.addr;
 213                 rsp_addr = peer;
 214         } else {
 215                 init_addr = peer;
 216                 rsp_addr = sdata->vif.addr;
 217         }
 218
 219         lnkid = skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
 220
 221         lnkid->ie_type = WLAN_EID_LINK_ID;
 222         lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
 223
 224         memcpy(lnkid->bssid, link->u.mgd.bssid, ETH_ALEN);
 225         memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
 226         memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
 227 }
 228
 229 static void
 230 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 231 {
 232         u8 *pos = skb_put(skb, 4);
 233
 234         *pos++ = WLAN_EID_AID;
 235         *pos++ = 2; /* len */
 236         put_unaligned_le16(sdata->vif.cfg.aid, pos);
 237 }
 238
 239 /* translate numbering in the WMM parameter IE to the mac80211 notation */
 240 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
 241 {
 242         switch (ac) {
 243         default:
 244                 WARN_ON_ONCE(1);
 245                 fallthrough;
 246         case 0:
 247                 return IEEE80211_AC_BE;
 248         case 1:
 249                 return IEEE80211_AC_BK;
 250         case 2:
 251                 return IEEE80211_AC_VI;
 252         case 3:
 253                 return IEEE80211_AC_VO;
 254         }
 255 }
 256
 257 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
 258 {
 259         u8 ret;
 260
 261         ret = aifsn & 0x0f;
 262         if (acm)
 263                 ret |= 0x10;
 264         ret |= (aci << 5) & 0x60;
 265         return ret;
 266 }
 267
 268 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
 269 {
 270         return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
 271                ((ilog2(cw_max + 1) << 0x4) & 0xf0);
 272 }
 273
 274 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
 275                                             struct sk_buff *skb)
 276 {
 277         struct ieee80211_wmm_param_ie *wmm;
 278         struct ieee80211_tx_queue_params *txq;
 279         int i;
 280
 281         wmm = skb_put_zero(skb, sizeof(*wmm));
 282
 283         wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
 284         wmm->len = sizeof(*wmm) - 2;
 285
 286         wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
 287         wmm->oui[1] = 0x50;
 288         wmm->oui[2] = 0xf2;
 289         wmm->oui_type = 2; /* WME */
 290         wmm->oui_subtype = 1; /* WME param */
 291         wmm->version = 1; /* WME ver */
 292         wmm->qos_info = 0; /* U-APSD not in use */
 293
 294         /*
 295          * Use the EDCA parameters defined for the BSS, or default if the AP
 296          * doesn't support it, as mandated by 802.11-2012 section 10.22.4
 297          */
 298         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 299                 txq = &sdata->deflink.tx_conf[ieee80211_ac_from_wmm(i)];
 300                 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
 301                                                                txq->acm, i);
 302                 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
 303                 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
 304         }
 305 }
 306
 307 static void
 308 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
 309                                    struct sta_info *sta)
 310 {
 311         /* IEEE802.11ac-2013 Table E-4 */
 312         static const u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
 313         struct cfg80211_chan_def uc = sta->tdls_chandef;
 314         enum nl80211_chan_width max_width =
 315                 ieee80211_sta_cap_chan_bw(&sta->deflink);
 316         int i;
 317
 318         /* only support upgrading non-narrow channels up to 80Mhz */
 319         if (max_width == NL80211_CHAN_WIDTH_5 ||
 320             max_width == NL80211_CHAN_WIDTH_10)
 321                 return;
 322
 323         if (max_width > NL80211_CHAN_WIDTH_80)
 324                 max_width = NL80211_CHAN_WIDTH_80;
 325
 326         if (uc.width >= max_width)
 327                 return;
 328         /*
 329          * Channel usage constrains in the IEEE802.11ac-2013 specification only
 330          * allow expanding a 20MHz channel to 80MHz in a single way. In
 331          * addition, there are no 40MHz allowed channels that are not part of
 332          * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
 333          */
 334         for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
 335                 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
 336                         uc.center_freq1 = centers_80mhz[i];
 337                         uc.center_freq2 = 0;
 338                         uc.width = NL80211_CHAN_WIDTH_80;
 339                         break;
 340                 }
 341
 342         if (!uc.center_freq1)
 343                 return;
 344
 345         /* proceed to downgrade the chandef until usable or the same as AP BW */
 346         while (uc.width > max_width ||
 347                (uc.width > sta->tdls_chandef.width &&
 348                 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
 349                                                sdata->wdev.iftype)))
 350                 ieee80211_chandef_downgrade(&uc);
 351
 352         if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
 353                 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
 354                          sta->tdls_chandef.width, uc.width);
 355
 356                 /*
 357                  * the station is not yet authorized when BW upgrade is done,
 358                  * locking is not required
 359                  */
 360                 sta->tdls_chandef = uc;
 361         }
 362 }
 363
 364 static void
 365 ieee80211_tdls_add_setup_start_ies(struct ieee80211_link_data *link,
 366                                    struct sk_buff *skb, const u8 *peer,
 367                                    u8 action_code, bool initiator,
 368                                    const u8 *extra_ies, size_t extra_ies_len)
 369 {
 370         struct ieee80211_sub_if_data *sdata = link->sdata;
 371         struct ieee80211_supported_band *sband;
 372         struct ieee80211_local *local = sdata->local;
 373         struct ieee80211_sta_ht_cap ht_cap;
 374         struct ieee80211_sta_vht_cap vht_cap;
 375         const struct ieee80211_sta_he_cap *he_cap;
 376         const struct ieee80211_sta_eht_cap *eht_cap;
 377         struct sta_info *sta = NULL;
 378         size_t offset = 0, noffset;
 379         u8 *pos;
 380
 381         sband = ieee80211_get_link_sband(link);
 382         if (WARN_ON_ONCE(!sband))
 383                 return;
 384
 385         ieee80211_add_srates_ie(sdata, skb, false, sband->band);
 386         ieee80211_add_ext_srates_ie(sdata, skb, false, sband->band);
 387         ieee80211_tdls_add_supp_channels(sdata, skb);
 388
 389         /* add any custom IEs that go before Extended Capabilities */
 390         if (extra_ies_len) {
 391                 static const u8 before_ext_cap[] = {
 392                         WLAN_EID_SUPP_RATES,
 393                         WLAN_EID_COUNTRY,
 394                         WLAN_EID_EXT_SUPP_RATES,
 395                         WLAN_EID_SUPPORTED_CHANNELS,
 396                         WLAN_EID_RSN,
 397                 };
 398                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 399                                              before_ext_cap,
 400                                              ARRAY_SIZE(before_ext_cap),
 401                                              offset);
 402                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 403                 offset = noffset;
 404         }
 405
 406         ieee80211_tdls_add_ext_capab(link, skb);
 407
 408         /* add the QoS element if we support it */
 409         if (local->hw.queues >= IEEE80211_NUM_ACS &&
 410             action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
 411                 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
 412
 413         /* add any custom IEs that go before HT capabilities */
 414         if (extra_ies_len) {
 415                 static const u8 before_ht_cap[] = {
 416                         WLAN_EID_SUPP_RATES,
 417                         WLAN_EID_COUNTRY,
 418                         WLAN_EID_EXT_SUPP_RATES,
 419                         WLAN_EID_SUPPORTED_CHANNELS,
 420                         WLAN_EID_RSN,
 421                         WLAN_EID_EXT_CAPABILITY,
 422                         WLAN_EID_QOS_CAPA,
 423                         WLAN_EID_FAST_BSS_TRANSITION,
 424                         WLAN_EID_TIMEOUT_INTERVAL,
 425                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 426                 };
 427                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 428                                              before_ht_cap,
 429                                              ARRAY_SIZE(before_ht_cap),
 430                                              offset);
 431                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 432                 offset = noffset;
 433         }
 434
 435         /* we should have the peer STA if we're already responding */
 436         if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
 437                 sta = sta_info_get(sdata, peer);
 438                 if (WARN_ON_ONCE(!sta))
 439                         return;
 440
 441                 sta->tdls_chandef = link->conf->chandef;
 442         }
 443
 444         ieee80211_tdls_add_oper_classes(link, skb);
 445
 446         /*
 447          * with TDLS we can switch channels, and HT-caps are not necessarily
 448          * the same on all bands. The specification limits the setup to a
 449          * single HT-cap, so use the current band for now.
 450          */
 451         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 452
 453         if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 454              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 455             ht_cap.ht_supported) {
 456                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 457
 458                 /* disable SMPS in TDLS initiator */
 459                 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
 460                                 << IEEE80211_HT_CAP_SM_PS_SHIFT;
 461
 462                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 463                 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 464         } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 465                    ht_cap.ht_supported && sta->sta.deflink.ht_cap.ht_supported) {
 466                 /* the peer caps are already intersected with our own */
 467                 memcpy(&ht_cap, &sta->sta.deflink.ht_cap, sizeof(ht_cap));
 468
 469                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 470                 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 471         }
 472
 473         if (ht_cap.ht_supported &&
 474             (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
 475                 ieee80211_tdls_add_bss_coex_ie(skb);
 476
 477         ieee80211_tdls_add_link_ie(link, skb, peer, initiator);
 478
 479         /* add any custom IEs that go before VHT capabilities */
 480         if (extra_ies_len) {
 481                 static const u8 before_vht_cap[] = {
 482                         WLAN_EID_SUPP_RATES,
 483                         WLAN_EID_COUNTRY,
 484                         WLAN_EID_EXT_SUPP_RATES,
 485                         WLAN_EID_SUPPORTED_CHANNELS,
 486                         WLAN_EID_RSN,
 487                         WLAN_EID_EXT_CAPABILITY,
 488                         WLAN_EID_QOS_CAPA,
 489                         WLAN_EID_FAST_BSS_TRANSITION,
 490                         WLAN_EID_TIMEOUT_INTERVAL,
 491                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 492                         WLAN_EID_MULTI_BAND,
 493                 };
 494                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 495                                              before_vht_cap,
 496                                              ARRAY_SIZE(before_vht_cap),
 497                                              offset);
 498                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 499                 offset = noffset;
 500         }
 501
 502         /* add AID if VHT, HE or EHT capabilities supported */
 503         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 504         he_cap = ieee80211_get_he_iftype_cap_vif(sband, &sdata->vif);
 505         eht_cap = ieee80211_get_eht_iftype_cap_vif(sband, &sdata->vif);
 506         if ((vht_cap.vht_supported || he_cap || eht_cap) &&
 507             (action_code == WLAN_TDLS_SETUP_REQUEST ||
 508              action_code == WLAN_TDLS_SETUP_RESPONSE))
 509                 ieee80211_tdls_add_aid(sdata, skb);
 510
 511         /* build the VHT-cap similarly to the HT-cap */
 512         if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 513              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 514             vht_cap.vht_supported) {
 515                 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 516
 517                 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 518                 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 519         } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 520                    vht_cap.vht_supported && sta->sta.deflink.vht_cap.vht_supported) {
 521                 /* the peer caps are already intersected with our own */
 522                 memcpy(&vht_cap, &sta->sta.deflink.vht_cap, sizeof(vht_cap));
 523
 524                 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 525                 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 526
 527                 /*
 528                  * if both peers support WIDER_BW, we can expand the chandef to
 529                  * a wider compatible one, up to 80MHz
 530                  */
 531                 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 532                         ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 533         }
 534
 535         /* add any custom IEs that go before HE capabilities */
 536         if (extra_ies_len) {
 537                 static const u8 before_he_cap[] = {
 538                         WLAN_EID_EXTENSION,
 539                         WLAN_EID_EXT_FILS_REQ_PARAMS,
 540                         WLAN_EID_AP_CSN,
 541                 };
 542                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 543                                              before_he_cap,
 544                                              ARRAY_SIZE(before_he_cap),
 545                                              offset);
 546                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 547                 offset = noffset;
 548         }
 549
 550         /* build the HE-cap from sband */
 551         if (he_cap &&
 552             (action_code == WLAN_TDLS_SETUP_REQUEST ||
 553              action_code == WLAN_TDLS_SETUP_RESPONSE ||
 554              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES)) {
 555                 __le16 he_6ghz_capa;
 556                 u8 cap_size;
 557
 558                 cap_size =
 559                         2 + 1 + sizeof(he_cap->he_cap_elem) +
 560                         ieee80211_he_mcs_nss_size(&he_cap->he_cap_elem) +
 561                         ieee80211_he_ppe_size(he_cap->ppe_thres[0],
 562                                               he_cap->he_cap_elem.phy_cap_info);
 563                 pos = skb_put(skb, cap_size);
 564                 pos = ieee80211_ie_build_he_cap(0, pos, he_cap, pos + cap_size);
 565
 566                 /* Build HE 6Ghz capa IE from sband */
 567                 if (sband->band == NL80211_BAND_6GHZ) {
 568                         cap_size = 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa);
 569                         pos = skb_put(skb, cap_size);
 570                         he_6ghz_capa =
 571                                 ieee80211_get_he_6ghz_capa_vif(sband, &sdata->vif);
 572                         pos = ieee80211_write_he_6ghz_cap(pos, he_6ghz_capa,
 573                                                           pos + cap_size);
 574                 }
 575         }
 576
 577         /* add any custom IEs that go before EHT capabilities */
 578         if (extra_ies_len) {
 579                 static const u8 before_he_cap[] = {
 580                         WLAN_EID_EXTENSION,
 581                         WLAN_EID_EXT_FILS_REQ_PARAMS,
 582                         WLAN_EID_AP_CSN,
 583                 };
 584
 585                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 586                                              before_he_cap,
 587                                              ARRAY_SIZE(before_he_cap),
 588                                              offset);
 589                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 590                 offset = noffset;
 591         }
 592
 593         /* build the EHT-cap from sband */
 594         if (he_cap && eht_cap &&
 595             (action_code == WLAN_TDLS_SETUP_REQUEST ||
 596              action_code == WLAN_TDLS_SETUP_RESPONSE ||
 597              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES)) {
 598                 u8 cap_size;
 599
 600                 cap_size =
 601                         2 + 1 + sizeof(eht_cap->eht_cap_elem) +
 602                         ieee80211_eht_mcs_nss_size(&he_cap->he_cap_elem,
 603                                                    &eht_cap->eht_cap_elem, false) +
 604                         ieee80211_eht_ppe_size(eht_cap->eht_ppe_thres[0],
 605                                                eht_cap->eht_cap_elem.phy_cap_info);
 606                 pos = skb_put(skb, cap_size);
 607                 ieee80211_ie_build_eht_cap(pos, he_cap, eht_cap, pos + cap_size, false);
 608         }
 609
 610         /* add any remaining IEs */
 611         if (extra_ies_len) {
 612                 noffset = extra_ies_len;
 613                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 614         }
 615
 616 }
 617
 618 static void
 619 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_link_data *link,
 620                                  struct sk_buff *skb, const u8 *peer,
 621                                  bool initiator, const u8 *extra_ies,
 622                                  size_t extra_ies_len)
 623 {
 624         struct ieee80211_sub_if_data *sdata = link->sdata;
 625         struct ieee80211_local *local = sdata->local;
 626         size_t offset = 0, noffset;
 627         struct sta_info *sta, *ap_sta;
 628         struct ieee80211_supported_band *sband;
 629         u8 *pos;
 630
 631         sband = ieee80211_get_link_sband(link);
 632         if (WARN_ON_ONCE(!sband))
 633                 return;
 634
 635         sta = sta_info_get(sdata, peer);
 636         ap_sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr);
 637
 638         if (WARN_ON_ONCE(!sta || !ap_sta))
 639                 return;
 640
 641         sta->tdls_chandef = link->conf->chandef;
 642
 643         /* add any custom IEs that go before the QoS IE */
 644         if (extra_ies_len) {
 645                 static const u8 before_qos[] = {
 646                         WLAN_EID_RSN,
 647                 };
 648                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 649                                              before_qos,
 650                                              ARRAY_SIZE(before_qos),
 651                                              offset);
 652                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 653                 offset = noffset;
 654         }
 655
 656         /* add the QoS param IE if both the peer and we support it */
 657         if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
 658                 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
 659
 660         /* add any custom IEs that go before HT operation */
 661         if (extra_ies_len) {
 662                 static const u8 before_ht_op[] = {
 663                         WLAN_EID_RSN,
 664                         WLAN_EID_QOS_CAPA,
 665                         WLAN_EID_FAST_BSS_TRANSITION,
 666                         WLAN_EID_TIMEOUT_INTERVAL,
 667                 };
 668                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 669                                              before_ht_op,
 670                                              ARRAY_SIZE(before_ht_op),
 671                                              offset);
 672                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 673                 offset = noffset;
 674         }
 675
 676         /*
 677          * if HT support is only added in TDLS, we need an HT-operation IE.
 678          * add the IE as required by IEEE802.11-2012 9.23.3.2.
 679          */
 680         if (!ap_sta->sta.deflink.ht_cap.ht_supported && sta->sta.deflink.ht_cap.ht_supported) {
 681                 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
 682                            IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
 683                            IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
 684
 685                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 686                 ieee80211_ie_build_ht_oper(pos, &sta->sta.deflink.ht_cap,
 687                                            &link->conf->chandef, prot,
 688                                            true);
 689         }
 690
 691         ieee80211_tdls_add_link_ie(link, skb, peer, initiator);
 692
 693         /* only include VHT-operation if not on the 2.4GHz band */
 694         if (sband->band != NL80211_BAND_2GHZ &&
 695             sta->sta.deflink.vht_cap.vht_supported) {
 696                 /*
 697                  * if both peers support WIDER_BW, we can expand the chandef to
 698                  * a wider compatible one, up to 80MHz
 699                  */
 700                 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 701                         ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 702
 703                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 704                 ieee80211_ie_build_vht_oper(pos, &sta->sta.deflink.vht_cap,
 705                                             &sta->tdls_chandef);
 706         }
 707
 708         /* add any remaining IEs */
 709         if (extra_ies_len) {
 710                 noffset = extra_ies_len;
 711                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 712         }
 713 }
 714
 715 static void
 716 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_link_data *link,
 717                                        struct sk_buff *skb, const u8 *peer,
 718                                        bool initiator, const u8 *extra_ies,
 719                                        size_t extra_ies_len, u8 oper_class,
 720                                        struct cfg80211_chan_def *chandef)
 721 {
 722         struct ieee80211_tdls_data *tf;
 723         size_t offset = 0, noffset;
 724
 725         if (WARN_ON_ONCE(!chandef))
 726                 return;
 727
 728         tf = (void *)skb->data;
 729         tf->u.chan_switch_req.target_channel =
 730                 ieee80211_frequency_to_channel(chandef->chan->center_freq);
 731         tf->u.chan_switch_req.oper_class = oper_class;
 732
 733         if (extra_ies_len) {
 734                 static const u8 before_lnkie[] = {
 735                         WLAN_EID_SECONDARY_CHANNEL_OFFSET,
 736                 };
 737                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 738                                              before_lnkie,
 739                                              ARRAY_SIZE(before_lnkie),
 740                                              offset);
 741                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 742                 offset = noffset;
 743         }
 744
 745         ieee80211_tdls_add_link_ie(link, skb, peer, initiator);
 746
 747         /* add any remaining IEs */
 748         if (extra_ies_len) {
 749                 noffset = extra_ies_len;
 750                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 751         }
 752 }
 753
 754 static void
 755 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_link_data *link,
 756                                         struct sk_buff *skb, const u8 *peer,
 757                                         u16 status_code, bool initiator,
 758                                         const u8 *extra_ies,
 759                                         size_t extra_ies_len)
 760 {
 761         if (status_code == 0)
 762                 ieee80211_tdls_add_link_ie(link, skb, peer, initiator);
 763
 764         if (extra_ies_len)
 765                 skb_put_data(skb, extra_ies, extra_ies_len);
 766 }
 767
 768 static void ieee80211_tdls_add_ies(struct ieee80211_link_data *link,
 769                                    struct sk_buff *skb, const u8 *peer,
 770                                    u8 action_code, u16 status_code,
 771                                    bool initiator, const u8 *extra_ies,
 772                                    size_t extra_ies_len, u8 oper_class,
 773                                    struct cfg80211_chan_def *chandef)
 774 {
 775         switch (action_code) {
 776         case WLAN_TDLS_SETUP_REQUEST:
 777         case WLAN_TDLS_SETUP_RESPONSE:
 778         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 779                 if (status_code == 0)
 780                         ieee80211_tdls_add_setup_start_ies(link,
 781                                                            skb, peer,
 782                                                            action_code,
 783                                                            initiator,
 784                                                            extra_ies,
 785                                                            extra_ies_len);
 786                 break;
 787         case WLAN_TDLS_SETUP_CONFIRM:
 788                 if (status_code == 0)
 789                         ieee80211_tdls_add_setup_cfm_ies(link, skb, peer,
 790                                                          initiator, extra_ies,
 791                                                          extra_ies_len);
 792                 break;
 793         case WLAN_TDLS_TEARDOWN:
 794         case WLAN_TDLS_DISCOVERY_REQUEST:
 795                 if (extra_ies_len)
 796                         skb_put_data(skb, extra_ies, extra_ies_len);
 797                 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
 798                         ieee80211_tdls_add_link_ie(link, skb,
 799                                                    peer, initiator);
 800                 break;
 801         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 802                 ieee80211_tdls_add_chan_switch_req_ies(link, skb, peer,
 803                                                        initiator, extra_ies,
 804                                                        extra_ies_len,
 805                                                        oper_class, chandef);
 806                 break;
 807         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 808                 ieee80211_tdls_add_chan_switch_resp_ies(link, skb, peer,
 809                                                         status_code,
 810                                                         initiator, extra_ies,
 811                                                         extra_ies_len);
 812                 break;
 813         }
 814
 815 }
 816
 817 static int
 818 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
 819                                struct ieee80211_link_data *link,
 820                                const u8 *peer, u8 action_code, u8 dialog_token,
 821                                u16 status_code, struct sk_buff *skb)
 822 {
 823         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 824         struct ieee80211_tdls_data *tf;
 825
 826         tf = skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
 827
 828         memcpy(tf->da, peer, ETH_ALEN);
 829         memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
 830         tf->ether_type = cpu_to_be16(ETH_P_TDLS);
 831         tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
 832
 833         /* network header is after the ethernet header */
 834         skb_set_network_header(skb, ETH_HLEN);
 835
 836         switch (action_code) {
 837         case WLAN_TDLS_SETUP_REQUEST:
 838                 tf->category = WLAN_CATEGORY_TDLS;
 839                 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
 840
 841                 skb_put(skb, sizeof(tf->u.setup_req));
 842                 tf->u.setup_req.dialog_token = dialog_token;
 843                 tf->u.setup_req.capability =
 844                         cpu_to_le16(ieee80211_get_tdls_sta_capab(link,
 845                                                                  status_code));
 846                 break;
 847         case WLAN_TDLS_SETUP_RESPONSE:
 848                 tf->category = WLAN_CATEGORY_TDLS;
 849                 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
 850
 851                 skb_put(skb, sizeof(tf->u.setup_resp));
 852                 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
 853                 tf->u.setup_resp.dialog_token = dialog_token;
 854                 tf->u.setup_resp.capability =
 855                         cpu_to_le16(ieee80211_get_tdls_sta_capab(link,
 856                                                                  status_code));
 857                 break;
 858         case WLAN_TDLS_SETUP_CONFIRM:
 859                 tf->category = WLAN_CATEGORY_TDLS;
 860                 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
 861
 862                 skb_put(skb, sizeof(tf->u.setup_cfm));
 863                 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
 864                 tf->u.setup_cfm.dialog_token = dialog_token;
 865                 break;
 866         case WLAN_TDLS_TEARDOWN:
 867                 tf->category = WLAN_CATEGORY_TDLS;
 868                 tf->action_code = WLAN_TDLS_TEARDOWN;
 869
 870                 skb_put(skb, sizeof(tf->u.teardown));
 871                 tf->u.teardown.reason_code = cpu_to_le16(status_code);
 872                 break;
 873         case WLAN_TDLS_DISCOVERY_REQUEST:
 874                 tf->category = WLAN_CATEGORY_TDLS;
 875                 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
 876
 877                 skb_put(skb, sizeof(tf->u.discover_req));
 878                 tf->u.discover_req.dialog_token = dialog_token;
 879                 break;
 880         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 881                 tf->category = WLAN_CATEGORY_TDLS;
 882                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
 883
 884                 skb_put(skb, sizeof(tf->u.chan_switch_req));
 885                 break;
 886         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 887                 tf->category = WLAN_CATEGORY_TDLS;
 888                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
 889
 890                 skb_put(skb, sizeof(tf->u.chan_switch_resp));
 891                 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
 892                 break;
 893         default:
 894                 return -EINVAL;
 895         }
 896
 897         return 0;
 898 }
 899
 900 static int
 901 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
 902                            const u8 *peer, struct ieee80211_link_data *link,
 903                            u8 action_code, u8 dialog_token,
 904                            u16 status_code, struct sk_buff *skb)
 905 {
 906         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 907         struct ieee80211_mgmt *mgmt;
 908
 909         mgmt = skb_put_zero(skb, 24);
 910         memcpy(mgmt->da, peer, ETH_ALEN);
 911         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 912         memcpy(mgmt->bssid, link->u.mgd.bssid, ETH_ALEN);
 913         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 914                                           IEEE80211_STYPE_ACTION);
 915
 916         switch (action_code) {
 917         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 918                 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
 919                 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
 920                 mgmt->u.action.u.tdls_discover_resp.action_code =
 921                         WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
 922                 mgmt->u.action.u.tdls_discover_resp.dialog_token =
 923                         dialog_token;
 924                 mgmt->u.action.u.tdls_discover_resp.capability =
 925                         cpu_to_le16(ieee80211_get_tdls_sta_capab(link,
 926                                                                  status_code));
 927                 break;
 928         default:
 929                 return -EINVAL;
 930         }
 931
 932         return 0;
 933 }
 934
 935 static struct sk_buff *
 936 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
 937                                       const u8 *peer, int link_id,
 938                                       u8 action_code, u8 dialog_token,
 939                                       u16 status_code, bool initiator,
 940                                       const u8 *extra_ies, size_t extra_ies_len,
 941                                       u8 oper_class,
 942                                       struct cfg80211_chan_def *chandef)
 943 {
 944         struct ieee80211_local *local = sdata->local;
 945         struct sk_buff *skb;
 946         int ret;
 947         struct ieee80211_link_data *link;
 948
 949         link_id = link_id >= 0 ? link_id : 0;
 950         rcu_read_lock();
 951         link = rcu_dereference(sdata->link[link_id]);
 952         if (WARN_ON(!link))
 953                 goto unlock;
 954
 955         skb = netdev_alloc_skb(sdata->dev,
 956                                local->hw.extra_tx_headroom +
 957                                max(sizeof(struct ieee80211_mgmt),
 958                                    sizeof(struct ieee80211_tdls_data)) +
 959                                50 + /* supported rates */
 960                                10 + /* ext capab */
 961                                26 + /* max(WMM-info, WMM-param) */
 962                                2 + max(sizeof(struct ieee80211_ht_cap),
 963                                        sizeof(struct ieee80211_ht_operation)) +
 964                                2 + max(sizeof(struct ieee80211_vht_cap),
 965                                        sizeof(struct ieee80211_vht_operation)) +
 966                                2 + 1 + sizeof(struct ieee80211_he_cap_elem) +
 967                                        sizeof(struct ieee80211_he_mcs_nss_supp) +
 968                                        IEEE80211_HE_PPE_THRES_MAX_LEN +
 969                                2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
 970                                2 + 1 + sizeof(struct ieee80211_eht_cap_elem) +
 971                                        sizeof(struct ieee80211_eht_mcs_nss_supp) +
 972                                        IEEE80211_EHT_PPE_THRES_MAX_LEN +
 973                                50 + /* supported channels */
 974                                3 + /* 40/20 BSS coex */
 975                                4 + /* AID */
 976                                4 + /* oper classes */
 977                                extra_ies_len +
 978                                sizeof(struct ieee80211_tdls_lnkie));
 979         if (!skb)
 980                 goto unlock;
 981
 982         skb_reserve(skb, local->hw.extra_tx_headroom);
 983
 984         switch (action_code) {
 985         case WLAN_TDLS_SETUP_REQUEST:
 986         case WLAN_TDLS_SETUP_RESPONSE:
 987         case WLAN_TDLS_SETUP_CONFIRM:
 988         case WLAN_TDLS_TEARDOWN:
 989         case WLAN_TDLS_DISCOVERY_REQUEST:
 990         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 991         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 992                 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
 993                                                      sdata->dev, link, peer,
 994                                                      action_code, dialog_token,
 995                                                      status_code, skb);
 996                 break;
 997         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 998                 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
 999                                                  peer, link, action_code,
1000                                                  dialog_token, status_code,
1001                                                  skb);
1002                 break;
1003         default:
1004                 ret = -ENOTSUPP;
1005                 break;
1006         }
1007
1008         if (ret < 0)
1009                 goto fail;
1010
1011         ieee80211_tdls_add_ies(link, skb, peer, action_code, status_code,
1012                                initiator, extra_ies, extra_ies_len, oper_class,
1013                                chandef);
1014         rcu_read_unlock();
1015         return skb;
1016
1017 fail:
1018         dev_kfree_skb(skb);
1019 unlock:
1020         rcu_read_unlock();
1021         return NULL;
1022 }
1023
1024 static int
1025 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
1026                                 const u8 *peer, int link_id,
1027                                 u8 action_code, u8 dialog_token,
1028                                 u16 status_code, u32 peer_capability,
1029                                 bool initiator, const u8 *extra_ies,
1030                                 size_t extra_ies_len, u8 oper_class,
1031                                 struct cfg80211_chan_def *chandef)
1032 {
1033         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1034         struct sk_buff *skb = NULL;
1035         struct sta_info *sta;
1036         u32 flags = 0;
1037         int ret = 0;
1038
1039         rcu_read_lock();
1040         sta = sta_info_get(sdata, peer);
1041
1042         /* infer the initiator if we can, to support old userspace */
1043         switch (action_code) {
1044         case WLAN_TDLS_SETUP_REQUEST:
1045                 if (sta) {
1046                         set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
1047                         sta->sta.tdls_initiator = false;
1048                 }
1049                 fallthrough;
1050         case WLAN_TDLS_SETUP_CONFIRM:
1051         case WLAN_TDLS_DISCOVERY_REQUEST:
1052                 initiator = true;
1053                 break;
1054         case WLAN_TDLS_SETUP_RESPONSE:
1055                 /*
1056                  * In some testing scenarios, we send a request and response.
1057                  * Make the last packet sent take effect for the initiator
1058                  * value.
1059                  */
1060                 if (sta) {
1061                         clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
1062                         sta->sta.tdls_initiator = true;
1063                 }
1064                 fallthrough;
1065         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1066                 initiator = false;
1067                 break;
1068         case WLAN_TDLS_TEARDOWN:
1069         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1070         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1071                 /* any value is ok */
1072                 break;
1073         default:
1074                 ret = -ENOTSUPP;
1075                 break;
1076         }
1077
1078         if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
1079                 initiator = true;
1080
1081         rcu_read_unlock();
1082         if (ret < 0)
1083                 goto fail;
1084
1085         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer,
1086                                                     link_id, action_code,
1087                                                     dialog_token, status_code,
1088                                                     initiator, extra_ies,
1089                                                     extra_ies_len, oper_class,
1090                                                     chandef);
1091         if (!skb) {
1092                 ret = -EINVAL;
1093                 goto fail;
1094         }
1095
1096         if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
1097                 ieee80211_tx_skb_tid(sdata, skb, 7, link_id);
1098                 return 0;
1099         }
1100
1101         /*
1102          * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1103          * we should default to AC_VI.
1104          */
1105         switch (action_code) {
1106         case WLAN_TDLS_SETUP_REQUEST:
1107         case WLAN_TDLS_SETUP_RESPONSE:
1108                 skb->priority = 256 + 2;
1109                 break;
1110         default:
1111                 skb->priority = 256 + 5;
1112                 break;
1113         }
1114
1115         /*
1116          * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1117          * Later, if no ACK is returned from peer, we will re-send the teardown
1118          * packet through the AP.
1119          */
1120         if ((action_code == WLAN_TDLS_TEARDOWN) &&
1121             ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1122                 bool try_resend; /* Should we keep skb for possible resend */
1123
1124                 /* If not sending directly to peer - no point in keeping skb */
1125                 rcu_read_lock();
1126                 sta = sta_info_get(sdata, peer);
1127                 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1128                 rcu_read_unlock();
1129
1130                 spin_lock_bh(&sdata->u.mgd.teardown_lock);
1131                 if (try_resend && !sdata->u.mgd.teardown_skb) {
1132                         /* Mark it as requiring TX status callback  */
1133                         flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1134                                  IEEE80211_TX_INTFL_MLME_CONN_TX;
1135
1136                         /*
1137                          * skb is copied since mac80211 will later set
1138                          * properties that might not be the same as the AP,
1139                          * such as encryption, QoS, addresses, etc.
1140                          *
1141                          * No problem if skb_copy() fails, so no need to check.
1142                          */
1143                         sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1144                         sdata->u.mgd.orig_teardown_skb = skb;
1145                 }
1146                 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1147         }
1148
1149         /* disable bottom halves when entering the Tx path */
1150         local_bh_disable();
1151         __ieee80211_subif_start_xmit(skb, dev, flags,
1152                                      IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL);
1153         local_bh_enable();
1154
1155         return ret;
1156
1157 fail:
1158         dev_kfree_skb(skb);
1159         return ret;
1160 }
1161
1162 static int
1163 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1164                           const u8 *peer, int link_id,
1165                           u8 action_code, u8 dialog_token,
1166                           u16 status_code, u32 peer_capability, bool initiator,
1167                           const u8 *extra_ies, size_t extra_ies_len)
1168 {
1169         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1170         struct ieee80211_local *local = sdata->local;
1171         enum ieee80211_smps_mode smps_mode =
1172                 sdata->deflink.u.mgd.driver_smps_mode;
1173         int ret;
1174
1175         /* don't support setup with forced SMPS mode that's not off */
1176         if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1177             smps_mode != IEEE80211_SMPS_OFF) {
1178                 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1179                          smps_mode);
1180                 return -ENOTSUPP;
1181         }
1182
1183         lockdep_assert_wiphy(local->hw.wiphy);
1184
1185         /* we don't support concurrent TDLS peer setups */
1186         if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1187             !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1188                 ret = -EBUSY;
1189                 goto out_unlock;
1190         }
1191
1192         /*
1193          * make sure we have a STA representing the peer so we drop or buffer
1194          * non-TDLS-setup frames to the peer. We can't send other packets
1195          * during setup through the AP path.
1196          * Allow error packets to be sent - sometimes we don't even add a STA
1197          * before failing the setup.
1198          */
1199         if (status_code == 0) {
1200                 rcu_read_lock();
1201                 if (!sta_info_get(sdata, peer)) {
1202                         rcu_read_unlock();
1203                         ret = -ENOLINK;
1204                         goto out_unlock;
1205                 }
1206                 rcu_read_unlock();
1207         }
1208
1209         ieee80211_flush_queues(local, sdata, false);
1210         memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1211
1212         /* we cannot take the mutex while preparing the setup packet */
1213         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1214                                               link_id, action_code,
1215                                               dialog_token, status_code,
1216                                               peer_capability, initiator,
1217                                               extra_ies, extra_ies_len, 0,
1218                                               NULL);
1219         if (ret < 0) {
1220                 eth_zero_addr(sdata->u.mgd.tdls_peer);
1221                 return ret;
1222         }
1223
1224         wiphy_delayed_work_queue(sdata->local->hw.wiphy,
1225                                  &sdata->u.mgd.tdls_peer_del_work,
1226                                  TDLS_PEER_SETUP_TIMEOUT);
1227         return 0;
1228
1229 out_unlock:
1230         return ret;
1231 }
1232
1233 static int
1234 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1235                              const u8 *peer, int link_id,
1236                              u8 action_code, u8 dialog_token,
1237                              u16 status_code, u32 peer_capability,
1238                              bool initiator, const u8 *extra_ies,
1239                              size_t extra_ies_len)
1240 {
1241         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1242         struct ieee80211_local *local = sdata->local;
1243         struct sta_info *sta;
1244         int ret;
1245
1246         /*
1247          * No packets can be transmitted to the peer via the AP during setup -
1248          * the STA is set as a TDLS peer, but is not authorized.
1249          * During teardown, we prevent direct transmissions by stopping the
1250          * queues and flushing all direct packets.
1251          */
1252         ieee80211_stop_vif_queues(local, sdata,
1253                                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1254         ieee80211_flush_queues(local, sdata, false);
1255
1256         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1257                                               link_id, action_code,
1258                                               dialog_token, status_code,
1259                                               peer_capability, initiator,
1260                                               extra_ies, extra_ies_len, 0,
1261                                               NULL);
1262         if (ret < 0)
1263                 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1264                           ret);
1265
1266         /*
1267          * Remove the STA AUTH flag to force further traffic through the AP. If
1268          * the STA was unreachable, it was already removed.
1269          */
1270         rcu_read_lock();
1271         sta = sta_info_get(sdata, peer);
1272         if (sta)
1273                 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1274         rcu_read_unlock();
1275
1276         ieee80211_wake_vif_queues(local, sdata,
1277                                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1278
1279         return 0;
1280 }
1281
1282 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1283                         const u8 *peer, int link_id,
1284                         u8 action_code, u8 dialog_token, u16 status_code,
1285                         u32 peer_capability, bool initiator,
1286                         const u8 *extra_ies, size_t extra_ies_len)
1287 {
1288         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1289         int ret;
1290
1291         if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1292                 return -ENOTSUPP;
1293
1294         /* make sure we are in managed mode, and associated */
1295         if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1296             !sdata->u.mgd.associated)
1297                 return -EINVAL;
1298
1299         switch (action_code) {
1300         case WLAN_TDLS_SETUP_REQUEST:
1301         case WLAN_TDLS_SETUP_RESPONSE:
1302                 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer,
1303                                                 link_id, action_code,
1304                                                 dialog_token, status_code,
1305                                                 peer_capability, initiator,
1306                                                 extra_ies, extra_ies_len);
1307                 break;
1308         case WLAN_TDLS_TEARDOWN:
1309                 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, link_id,
1310                                                    action_code, dialog_token,
1311                                                    status_code,
1312                                                    peer_capability, initiator,
1313                                                    extra_ies, extra_ies_len);
1314                 break;
1315         case WLAN_TDLS_DISCOVERY_REQUEST:
1316                 /*
1317                  * Protect the discovery so we can hear the TDLS discovery
1318                  * response frame. It is transmitted directly and not buffered
1319                  * by the AP.
1320                  */
1321                 drv_mgd_protect_tdls_discover(sdata->local, sdata, link_id);
1322                 fallthrough;
1323         case WLAN_TDLS_SETUP_CONFIRM:
1324         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1325                 /* no special handling */
1326                 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1327                                                       link_id, action_code,
1328                                                       dialog_token,
1329                                                       status_code,
1330                                                       peer_capability,
1331                                                       initiator, extra_ies,
1332                                                       extra_ies_len, 0, NULL);
1333                 break;
1334         default:
1335                 ret = -EOPNOTSUPP;
1336                 break;
1337         }
1338
1339         tdls_dbg(sdata, "TDLS mgmt action %d peer %pM link_id %d status %d\n",
1340                  action_code, peer, link_id, ret);
1341         return ret;
1342 }
1343
1344 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1345                                          struct sta_info *sta)
1346 {
1347         struct ieee80211_local *local = sdata->local;
1348         struct ieee80211_chanctx_conf *conf;
1349         struct ieee80211_chanctx *ctx;
1350         enum nl80211_chan_width width;
1351         struct ieee80211_supported_band *sband;
1352
1353         lockdep_assert_wiphy(local->hw.wiphy);
1354
1355         conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf,
1356                                          lockdep_is_held(&local->hw.wiphy->mtx));
1357         if (conf) {
1358                 width = conf->def.width;
1359                 sband = local->hw.wiphy->bands[conf->def.chan->band];
1360                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1361                 ieee80211_recalc_chanctx_chantype(local, ctx);
1362
1363                 /* if width changed and a peer is given, update its BW */
1364                 if (width != conf->def.width && sta &&
1365                     test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1366                         enum ieee80211_sta_rx_bandwidth bw;
1367
1368                         bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1369                         bw = min(bw, ieee80211_sta_cap_rx_bw(&sta->deflink));
1370                         if (bw != sta->sta.deflink.bandwidth) {
1371                                 sta->sta.deflink.bandwidth = bw;
1372                                 rate_control_rate_update(local, sband, sta, 0,
1373                                                          IEEE80211_RC_BW_CHANGED);
1374                                 /*
1375                                  * if a TDLS peer BW was updated, we need to
1376                                  * recalc the chandef width again, to get the
1377                                  * correct chanctx min_def
1378                                  */
1379                                 ieee80211_recalc_chanctx_chantype(local, ctx);
1380                         }
1381                 }
1382
1383         }
1384 }
1385
1386 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1387 {
1388         struct sta_info *sta;
1389         bool result = false;
1390
1391         rcu_read_lock();
1392         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1393                 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1394                     !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1395                     !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1396                     !sta->sta.deflink.ht_cap.ht_supported)
1397                         continue;
1398                 result = true;
1399                 break;
1400         }
1401         rcu_read_unlock();
1402
1403         return result;
1404 }
1405
1406 static void
1407 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1408                                    struct sta_info *sta)
1409 {
1410         bool tdls_ht;
1411         u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1412                          IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1413                          IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1414         u16 opmode;
1415
1416         /* Nothing to do if the BSS connection uses HT */
1417         if (!(sdata->deflink.u.mgd.conn_flags & IEEE80211_CONN_DISABLE_HT))
1418                 return;
1419
1420         tdls_ht = (sta && sta->sta.deflink.ht_cap.ht_supported) ||
1421                   iee80211_tdls_have_ht_peers(sdata);
1422
1423         opmode = sdata->vif.bss_conf.ht_operation_mode;
1424
1425         if (tdls_ht)
1426                 opmode |= protection;
1427         else
1428                 opmode &= ~protection;
1429
1430         if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1431                 return;
1432
1433         sdata->vif.bss_conf.ht_operation_mode = opmode;
1434         ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1435                                           BSS_CHANGED_HT);
1436 }
1437
1438 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1439                         const u8 *peer, enum nl80211_tdls_operation oper)
1440 {
1441         struct sta_info *sta;
1442         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1443         struct ieee80211_local *local = sdata->local;
1444         int ret;
1445
1446         lockdep_assert_wiphy(local->hw.wiphy);
1447
1448         if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1449                 return -ENOTSUPP;
1450
1451         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1452                 return -EINVAL;
1453
1454         switch (oper) {
1455         case NL80211_TDLS_ENABLE_LINK:
1456         case NL80211_TDLS_DISABLE_LINK:
1457                 break;
1458         case NL80211_TDLS_TEARDOWN:
1459         case NL80211_TDLS_SETUP:
1460         case NL80211_TDLS_DISCOVERY_REQ:
1461                 /* We don't support in-driver setup/teardown/discovery */
1462                 return -ENOTSUPP;
1463         }
1464
1465         /* protect possible bss_conf changes and avoid concurrency in
1466          * ieee80211_bss_info_change_notify()
1467          */
1468         tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1469
1470         switch (oper) {
1471         case NL80211_TDLS_ENABLE_LINK:
1472                 if (sdata->vif.bss_conf.csa_active) {
1473                         tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1474                         return -EBUSY;
1475                 }
1476
1477                 sta = sta_info_get(sdata, peer);
1478                 if (!sta)
1479                         return -ENOLINK;
1480
1481                 iee80211_tdls_recalc_chanctx(sdata, sta);
1482                 iee80211_tdls_recalc_ht_protection(sdata, sta);
1483
1484                 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1485
1486                 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1487                              !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1488                 break;
1489         case NL80211_TDLS_DISABLE_LINK:
1490                 /*
1491                  * The teardown message in ieee80211_tdls_mgmt_teardown() was
1492                  * created while the queues were stopped, so it might still be
1493                  * pending. Before flushing the queues we need to be sure the
1494                  * message is handled by the tasklet handling pending messages,
1495                  * otherwise we might start destroying the station before
1496                  * sending the teardown packet.
1497                  * Note that this only forces the tasklet to flush pendings -
1498                  * not to stop the tasklet from rescheduling itself.
1499                  */
1500                 tasklet_kill(&local->tx_pending_tasklet);
1501                 /* flush a potentially queued teardown packet */
1502                 ieee80211_flush_queues(local, sdata, false);
1503
1504                 ret = sta_info_destroy_addr(sdata, peer);
1505
1506                 iee80211_tdls_recalc_ht_protection(sdata, NULL);
1507
1508                 iee80211_tdls_recalc_chanctx(sdata, NULL);
1509                 if (ret)
1510                         return ret;
1511                 break;
1512         default:
1513                 return -ENOTSUPP;
1514         }
1515
1516         if (ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1517                 wiphy_delayed_work_cancel(sdata->local->hw.wiphy,
1518                                           &sdata->u.mgd.tdls_peer_del_work);
1519                 eth_zero_addr(sdata->u.mgd.tdls_peer);
1520         }
1521
1522         wiphy_work_queue(sdata->local->hw.wiphy,
1523                          &sdata->deflink.u.mgd.request_smps_work);
1524
1525         return 0;
1526 }
1527
1528 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1529                                  enum nl80211_tdls_operation oper,
1530                                  u16 reason_code, gfp_t gfp)
1531 {
1532         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1533
1534         if (vif->type != NL80211_IFTYPE_STATION || !vif->cfg.assoc) {
1535                 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1536                           oper);
1537                 return;
1538         }
1539
1540         cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1541 }
1542 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1543
1544 static void
1545 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1546 {
1547         struct ieee80211_ch_switch_timing *ch_sw;
1548
1549         *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1550         *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1551
1552         ch_sw = (void *)buf;
1553         ch_sw->switch_time = cpu_to_le16(switch_time);
1554         ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1555 }
1556
1557 /* find switch timing IE in SKB ready for Tx */
1558 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1559 {
1560         struct ieee80211_tdls_data *tf;
1561         const u8 *ie_start;
1562
1563         /*
1564          * Get the offset for the new location of the switch timing IE.
1565          * The SKB network header will now point to the "payload_type"
1566          * element of the TDLS data frame struct.
1567          */
1568         tf = container_of(skb->data + skb_network_offset(skb),
1569                           struct ieee80211_tdls_data, payload_type);
1570         ie_start = tf->u.chan_switch_req.variable;
1571         return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1572                                 skb->len - (ie_start - skb->data));
1573 }
1574
1575 static struct sk_buff *
1576 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1577                               struct cfg80211_chan_def *chandef,
1578                               u32 *ch_sw_tm_ie_offset)
1579 {
1580         struct ieee80211_sub_if_data *sdata = sta->sdata;
1581         u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1582                      2 + sizeof(struct ieee80211_ch_switch_timing)];
1583         int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1584         u8 *pos = extra_ies;
1585         struct sk_buff *skb;
1586         int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0;
1587
1588         /*
1589          * if chandef points to a wide channel add a Secondary-Channel
1590          * Offset information element
1591          */
1592         if (chandef->width == NL80211_CHAN_WIDTH_40) {
1593                 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1594                 bool ht40plus;
1595
1596                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1597                 *pos++ = sizeof(*sec_chan_ie);
1598                 sec_chan_ie = (void *)pos;
1599
1600                 ht40plus = cfg80211_get_chandef_type(chandef) ==
1601                                                         NL80211_CHAN_HT40PLUS;
1602                 sec_chan_ie->sec_chan_offs = ht40plus ?
1603                                              IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1604                                              IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1605                 pos += sizeof(*sec_chan_ie);
1606
1607                 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1608         }
1609
1610         /* just set the values to 0, this is a template */
1611         iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1612
1613         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1614                                               link_id,
1615                                               WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1616                                               0, 0, !sta->sta.tdls_initiator,
1617                                               extra_ies, extra_ies_len,
1618                                               oper_class, chandef);
1619         if (!skb)
1620                 return NULL;
1621
1622         skb = ieee80211_build_data_template(sdata, skb, 0);
1623         if (IS_ERR(skb)) {
1624                 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1625                 return NULL;
1626         }
1627
1628         if (ch_sw_tm_ie_offset) {
1629                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1630
1631                 if (!tm_ie) {
1632                         tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1633                         dev_kfree_skb_any(skb);
1634                         return NULL;
1635                 }
1636
1637                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1638         }
1639
1640         tdls_dbg(sdata,
1641                  "TDLS channel switch request template for %pM ch %d width %d\n",
1642                  sta->sta.addr, chandef->chan->center_freq, chandef->width);
1643         return skb;
1644 }
1645
1646 int
1647 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1648                               const u8 *addr, u8 oper_class,
1649                               struct cfg80211_chan_def *chandef)
1650 {
1651         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1652         struct ieee80211_local *local = sdata->local;
1653         struct sta_info *sta;
1654         struct sk_buff *skb = NULL;
1655         u32 ch_sw_tm_ie;
1656         int ret;
1657
1658         lockdep_assert_wiphy(local->hw.wiphy);
1659
1660         if (chandef->chan->freq_offset)
1661                 /* this may work, but is untested */
1662                 return -EOPNOTSUPP;
1663
1664         sta = sta_info_get(sdata, addr);
1665         if (!sta) {
1666                 tdls_dbg(sdata,
1667                          "Invalid TDLS peer %pM for channel switch request\n",
1668                          addr);
1669                 ret = -ENOENT;
1670                 goto out;
1671         }
1672
1673         if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1674                 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1675                          addr);
1676                 ret = -ENOTSUPP;
1677                 goto out;
1678         }
1679
1680         skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1681                                             &ch_sw_tm_ie);
1682         if (!skb) {
1683                 ret = -ENOENT;
1684                 goto out;
1685         }
1686
1687         ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1688                                       chandef, skb, ch_sw_tm_ie);
1689         if (!ret)
1690                 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1691
1692 out:
1693         dev_kfree_skb_any(skb);
1694         return ret;
1695 }
1696
1697 void
1698 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1699                                      struct net_device *dev,
1700                                      const u8 *addr)
1701 {
1702         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1703         struct ieee80211_local *local = sdata->local;
1704         struct sta_info *sta;
1705
1706         lockdep_assert_wiphy(local->hw.wiphy);
1707
1708         sta = sta_info_get(sdata, addr);
1709         if (!sta) {
1710                 tdls_dbg(sdata,
1711                          "Invalid TDLS peer %pM for channel switch cancel\n",
1712                          addr);
1713                 return;
1714         }
1715
1716         if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1717                 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1718                          addr);
1719                 return;
1720         }
1721
1722         drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1723         clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1724 }
1725
1726 static struct sk_buff *
1727 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1728                                    u32 *ch_sw_tm_ie_offset)
1729 {
1730         struct ieee80211_sub_if_data *sdata = sta->sdata;
1731         struct sk_buff *skb;
1732         u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1733         int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0;
1734
1735         /* initial timing are always zero in the template */
1736         iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1737
1738         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1739                                         link_id,
1740                                         WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1741                                         0, 0, !sta->sta.tdls_initiator,
1742                                         extra_ies, sizeof(extra_ies), 0, NULL);
1743         if (!skb)
1744                 return NULL;
1745
1746         skb = ieee80211_build_data_template(sdata, skb, 0);
1747         if (IS_ERR(skb)) {
1748                 tdls_dbg(sdata,
1749                          "Failed building TDLS channel switch resp frame\n");
1750                 return NULL;
1751         }
1752
1753         if (ch_sw_tm_ie_offset) {
1754                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1755
1756                 if (!tm_ie) {
1757                         tdls_dbg(sdata,
1758                                  "No switch timing IE in TDLS switch resp\n");
1759                         dev_kfree_skb_any(skb);
1760                         return NULL;
1761                 }
1762
1763                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1764         }
1765
1766         tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1767                  sta->sta.addr);
1768         return skb;
1769 }
1770
1771 static int
1772 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1773                                            struct sk_buff *skb)
1774 {
1775         struct ieee80211_local *local = sdata->local;
1776         struct ieee802_11_elems *elems = NULL;
1777         struct sta_info *sta;
1778         struct ieee80211_tdls_data *tf = (void *)skb->data;
1779         bool local_initiator;
1780         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1781         int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1782         struct ieee80211_tdls_ch_sw_params params = {};
1783         int ret;
1784
1785         lockdep_assert_wiphy(local->hw.wiphy);
1786
1787         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1788         params.timestamp = rx_status->device_timestamp;
1789
1790         if (skb->len < baselen) {
1791                 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1792                          skb->len);
1793                 return -EINVAL;
1794         }
1795
1796         sta = sta_info_get(sdata, tf->sa);
1797         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1798                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1799                          tf->sa);
1800                 ret = -EINVAL;
1801                 goto out;
1802         }
1803
1804         params.sta = &sta->sta;
1805         params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1806         if (params.status != 0) {
1807                 ret = 0;
1808                 goto call_drv;
1809         }
1810
1811         elems = ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1812                                        skb->len - baselen, false, NULL);
1813         if (!elems) {
1814                 ret = -ENOMEM;
1815                 goto out;
1816         }
1817
1818         if (elems->parse_error) {
1819                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1820                 ret = -EINVAL;
1821                 goto out;
1822         }
1823
1824         if (!elems->ch_sw_timing || !elems->lnk_id) {
1825                 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1826                 ret = -EINVAL;
1827                 goto out;
1828         }
1829
1830         /* validate the initiator is set correctly */
1831         local_initiator =
1832                 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1833         if (local_initiator == sta->sta.tdls_initiator) {
1834                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1835                 ret = -EINVAL;
1836                 goto out;
1837         }
1838
1839         params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time);
1840         params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout);
1841
1842         params.tmpl_skb =
1843                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1844         if (!params.tmpl_skb) {
1845                 ret = -ENOENT;
1846                 goto out;
1847         }
1848
1849         ret = 0;
1850 call_drv:
1851         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1852
1853         tdls_dbg(sdata,
1854                  "TDLS channel switch response received from %pM status %d\n",
1855                  tf->sa, params.status);
1856
1857 out:
1858         dev_kfree_skb_any(params.tmpl_skb);
1859         kfree(elems);
1860         return ret;
1861 }
1862
1863 static int
1864 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1865                                           struct sk_buff *skb)
1866 {
1867         struct ieee80211_local *local = sdata->local;
1868         struct ieee802_11_elems *elems;
1869         struct cfg80211_chan_def chandef;
1870         struct ieee80211_channel *chan;
1871         enum nl80211_channel_type chan_type;
1872         int freq;
1873         u8 target_channel, oper_class;
1874         bool local_initiator;
1875         struct sta_info *sta;
1876         enum nl80211_band band;
1877         struct ieee80211_tdls_data *tf = (void *)skb->data;
1878         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1879         int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1880         struct ieee80211_tdls_ch_sw_params params = {};
1881         int ret = 0;
1882
1883         lockdep_assert_wiphy(local->hw.wiphy);
1884
1885         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1886         params.timestamp = rx_status->device_timestamp;
1887
1888         if (skb->len < baselen) {
1889                 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1890                          skb->len);
1891                 return -EINVAL;
1892         }
1893
1894         target_channel = tf->u.chan_switch_req.target_channel;
1895         oper_class = tf->u.chan_switch_req.oper_class;
1896
1897         /*
1898          * We can't easily infer the channel band. The operating class is
1899          * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1900          * solution here is to treat channels with number >14 as 5GHz ones,
1901          * and specifically check for the (oper_class, channel) combinations
1902          * where this doesn't hold. These are thankfully unique according to
1903          * IEEE802.11-2012.
1904          * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1905          * valid here.
1906          */
1907         if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1908              oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1909              target_channel < 14)
1910                 band = NL80211_BAND_5GHZ;
1911         else
1912                 band = target_channel < 14 ? NL80211_BAND_2GHZ :
1913                                              NL80211_BAND_5GHZ;
1914
1915         freq = ieee80211_channel_to_frequency(target_channel, band);
1916         if (freq == 0) {
1917                 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1918                          target_channel);
1919                 return -EINVAL;
1920         }
1921
1922         chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1923         if (!chan) {
1924                 tdls_dbg(sdata,
1925                          "Unsupported channel for TDLS chan switch: %d\n",
1926                          target_channel);
1927                 return -EINVAL;
1928         }
1929
1930         elems = ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1931                                        skb->len - baselen, false, NULL);
1932         if (!elems)
1933                 return -ENOMEM;
1934
1935         if (elems->parse_error) {
1936                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1937                 ret = -EINVAL;
1938                 goto free;
1939         }
1940
1941         if (!elems->ch_sw_timing || !elems->lnk_id) {
1942                 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1943                 ret = -EINVAL;
1944                 goto free;
1945         }
1946
1947         if (!elems->sec_chan_offs) {
1948                 chan_type = NL80211_CHAN_HT20;
1949         } else {
1950                 switch (elems->sec_chan_offs->sec_chan_offs) {
1951                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1952                         chan_type = NL80211_CHAN_HT40PLUS;
1953                         break;
1954                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1955                         chan_type = NL80211_CHAN_HT40MINUS;
1956                         break;
1957                 default:
1958                         chan_type = NL80211_CHAN_HT20;
1959                         break;
1960                 }
1961         }
1962
1963         cfg80211_chandef_create(&chandef, chan, chan_type);
1964
1965         /* we will be active on the TDLS link */
1966         if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1967                                            sdata->wdev.iftype)) {
1968                 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1969                 ret = -EINVAL;
1970                 goto free;
1971         }
1972
1973         sta = sta_info_get(sdata, tf->sa);
1974         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1975                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1976                          tf->sa);
1977                 ret = -EINVAL;
1978                 goto out;
1979         }
1980
1981         params.sta = &sta->sta;
1982
1983         /* validate the initiator is set correctly */
1984         local_initiator =
1985                 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1986         if (local_initiator == sta->sta.tdls_initiator) {
1987                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1988                 ret = -EINVAL;
1989                 goto out;
1990         }
1991
1992         /* peer should have known better */
1993         if (!sta->sta.deflink.ht_cap.ht_supported && elems->sec_chan_offs &&
1994             elems->sec_chan_offs->sec_chan_offs) {
1995                 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1996                 ret = -ENOTSUPP;
1997                 goto out;
1998         }
1999
2000         params.chandef = &chandef;
2001         params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time);
2002         params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout);
2003
2004         params.tmpl_skb =
2005                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
2006                                                    &params.ch_sw_tm_ie);
2007         if (!params.tmpl_skb) {
2008                 ret = -ENOENT;
2009                 goto out;
2010         }
2011
2012         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
2013
2014         tdls_dbg(sdata,
2015                  "TDLS ch switch request received from %pM ch %d width %d\n",
2016                  tf->sa, params.chandef->chan->center_freq,
2017                  params.chandef->width);
2018 out:
2019         dev_kfree_skb_any(params.tmpl_skb);
2020 free:
2021         kfree(elems);
2022         return ret;
2023 }
2024
2025 void
2026 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
2027                                       struct sk_buff *skb)
2028 {
2029         struct ieee80211_tdls_data *tf = (void *)skb->data;
2030         struct wiphy *wiphy = sdata->local->hw.wiphy;
2031
2032         lockdep_assert_wiphy(wiphy);
2033
2034         /* make sure the driver supports it */
2035         if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
2036                 return;
2037
2038         /* we want to access the entire packet */
2039         if (skb_linearize(skb))
2040                 return;
2041         /*
2042          * The packet/size was already validated by mac80211 Rx path, only look
2043          * at the action type.
2044          */
2045         switch (tf->action_code) {
2046         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
2047                 ieee80211_process_tdls_channel_switch_req(sdata, skb);
2048                 break;
2049         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
2050                 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
2051                 break;
2052         default:
2053                 WARN_ON_ONCE(1);
2054                 return;
2055         }
2056 }
2057
2058 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
2059 {
2060         struct sta_info *sta;
2061         u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
2062
2063         rcu_read_lock();
2064         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
2065                 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
2066                     !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2067                         continue;
2068
2069                 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
2070                                             NL80211_TDLS_TEARDOWN, reason,
2071                                             GFP_ATOMIC);
2072         }
2073         rcu_read_unlock();
2074 }
2075
2076 void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata,
2077                                       const u8 *peer, u16 reason)
2078 {
2079         struct ieee80211_sta *sta;
2080
2081         rcu_read_lock();
2082         sta = ieee80211_find_sta(&sdata->vif, peer);
2083         if (!sta || !sta->tdls) {
2084                 rcu_read_unlock();
2085                 return;
2086         }
2087         rcu_read_unlock();
2088
2089         tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n",
2090                  peer, reason,
2091                  ieee80211_get_reason_code_string(reason));
2092
2093         ieee80211_tdls_oper_request(&sdata->vif, peer,
2094                                     NL80211_TDLS_TEARDOWN,
2095                                     WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE,
2096                                     GFP_ATOMIC);
2097 }