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 <[email protected]>
   6  * Copyright 2014, Intel Corporation
   7  * Copyright 2014  Intel Mobile Communications GmbH
   8  * Copyright 2015 - 2016 Intel Deutschland GmbH
   9  * Copyright (C) 2019, 2021-2024 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->chanreq.oper,
 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, NULL);
 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_put_srates_elem(skb, sband, 0, 0, 0, WLAN_EID_SUPP_RATES);
 386         ieee80211_put_srates_elem(skb, sband, 0, 0, 0, WLAN_EID_EXT_SUPP_RATES);
 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->chanreq.oper;
 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 (action_code == WLAN_TDLS_SETUP_REQUEST ||
 552             action_code == WLAN_TDLS_SETUP_RESPONSE ||
 553             action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
 554                 ieee80211_put_he_cap(skb, sdata, sband, NULL);
 555
 556                 /* Build HE 6Ghz capa IE from sband */
 557                 if (sband->band == NL80211_BAND_6GHZ)
 558                         ieee80211_put_he_6ghz_cap(skb, sdata, link->smps_mode);
 559         }
 560
 561         /* add any custom IEs that go before EHT capabilities */
 562         if (extra_ies_len) {
 563                 static const u8 before_he_cap[] = {
 564                         WLAN_EID_EXTENSION,
 565                         WLAN_EID_EXT_FILS_REQ_PARAMS,
 566                         WLAN_EID_AP_CSN,
 567                 };
 568
 569                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 570                                              before_he_cap,
 571                                              ARRAY_SIZE(before_he_cap),
 572                                              offset);
 573                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 574                 offset = noffset;
 575         }
 576
 577         /* build the EHT-cap from sband */
 578         if (action_code == WLAN_TDLS_SETUP_REQUEST ||
 579             action_code == WLAN_TDLS_SETUP_RESPONSE ||
 580             action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
 581                 ieee80211_put_eht_cap(skb, sdata, sband, NULL);
 582
 583         /* add any remaining IEs */
 584         if (extra_ies_len) {
 585                 noffset = extra_ies_len;
 586                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 587         }
 588
 589 }
 590
 591 static void
 592 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_link_data *link,
 593                                  struct sk_buff *skb, const u8 *peer,
 594                                  bool initiator, const u8 *extra_ies,
 595                                  size_t extra_ies_len)
 596 {
 597         struct ieee80211_sub_if_data *sdata = link->sdata;
 598         struct ieee80211_local *local = sdata->local;
 599         size_t offset = 0, noffset;
 600         struct sta_info *sta, *ap_sta;
 601         struct ieee80211_supported_band *sband;
 602         u8 *pos;
 603
 604         sband = ieee80211_get_link_sband(link);
 605         if (WARN_ON_ONCE(!sband))
 606                 return;
 607
 608         sta = sta_info_get(sdata, peer);
 609         ap_sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr);
 610
 611         if (WARN_ON_ONCE(!sta || !ap_sta))
 612                 return;
 613
 614         sta->tdls_chandef = link->conf->chanreq.oper;
 615
 616         /* add any custom IEs that go before the QoS IE */
 617         if (extra_ies_len) {
 618                 static const u8 before_qos[] = {
 619                         WLAN_EID_RSN,
 620                 };
 621                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 622                                              before_qos,
 623                                              ARRAY_SIZE(before_qos),
 624                                              offset);
 625                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 626                 offset = noffset;
 627         }
 628
 629         /* add the QoS param IE if both the peer and we support it */
 630         if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
 631                 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
 632
 633         /* add any custom IEs that go before HT operation */
 634         if (extra_ies_len) {
 635                 static const u8 before_ht_op[] = {
 636                         WLAN_EID_RSN,
 637                         WLAN_EID_QOS_CAPA,
 638                         WLAN_EID_FAST_BSS_TRANSITION,
 639                         WLAN_EID_TIMEOUT_INTERVAL,
 640                 };
 641                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 642                                              before_ht_op,
 643                                              ARRAY_SIZE(before_ht_op),
 644                                              offset);
 645                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 646                 offset = noffset;
 647         }
 648
 649         /*
 650          * if HT support is only added in TDLS, we need an HT-operation IE.
 651          * add the IE as required by IEEE802.11-2012 9.23.3.2.
 652          */
 653         if (!ap_sta->sta.deflink.ht_cap.ht_supported && sta->sta.deflink.ht_cap.ht_supported) {
 654                 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
 655                            IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
 656                            IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
 657
 658                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 659                 ieee80211_ie_build_ht_oper(pos, &sta->sta.deflink.ht_cap,
 660                                            &link->conf->chanreq.oper, prot,
 661                                            true);
 662         }
 663
 664         ieee80211_tdls_add_link_ie(link, skb, peer, initiator);
 665
 666         /* only include VHT-operation if not on the 2.4GHz band */
 667         if (sband->band != NL80211_BAND_2GHZ &&
 668             sta->sta.deflink.vht_cap.vht_supported) {
 669                 /*
 670                  * if both peers support WIDER_BW, we can expand the chandef to
 671                  * a wider compatible one, up to 80MHz
 672                  */
 673                 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 674                         ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 675
 676                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 677                 ieee80211_ie_build_vht_oper(pos, &sta->sta.deflink.vht_cap,
 678                                             &sta->tdls_chandef);
 679         }
 680
 681         /* add any remaining IEs */
 682         if (extra_ies_len) {
 683                 noffset = extra_ies_len;
 684                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 685         }
 686 }
 687
 688 static void
 689 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_link_data *link,
 690                                        struct sk_buff *skb, const u8 *peer,
 691                                        bool initiator, const u8 *extra_ies,
 692                                        size_t extra_ies_len, u8 oper_class,
 693                                        struct cfg80211_chan_def *chandef)
 694 {
 695         struct ieee80211_tdls_data *tf;
 696         size_t offset = 0, noffset;
 697
 698         if (WARN_ON_ONCE(!chandef))
 699                 return;
 700
 701         tf = (void *)skb->data;
 702         tf->u.chan_switch_req.target_channel =
 703                 ieee80211_frequency_to_channel(chandef->chan->center_freq);
 704         tf->u.chan_switch_req.oper_class = oper_class;
 705
 706         if (extra_ies_len) {
 707                 static const u8 before_lnkie[] = {
 708                         WLAN_EID_SECONDARY_CHANNEL_OFFSET,
 709                 };
 710                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 711                                              before_lnkie,
 712                                              ARRAY_SIZE(before_lnkie),
 713                                              offset);
 714                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 715                 offset = noffset;
 716         }
 717
 718         ieee80211_tdls_add_link_ie(link, skb, peer, initiator);
 719
 720         /* add any remaining IEs */
 721         if (extra_ies_len) {
 722                 noffset = extra_ies_len;
 723                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 724         }
 725 }
 726
 727 static void
 728 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_link_data *link,
 729                                         struct sk_buff *skb, const u8 *peer,
 730                                         u16 status_code, bool initiator,
 731                                         const u8 *extra_ies,
 732                                         size_t extra_ies_len)
 733 {
 734         if (status_code == 0)
 735                 ieee80211_tdls_add_link_ie(link, skb, peer, initiator);
 736
 737         if (extra_ies_len)
 738                 skb_put_data(skb, extra_ies, extra_ies_len);
 739 }
 740
 741 static void ieee80211_tdls_add_ies(struct ieee80211_link_data *link,
 742                                    struct sk_buff *skb, const u8 *peer,
 743                                    u8 action_code, u16 status_code,
 744                                    bool initiator, const u8 *extra_ies,
 745                                    size_t extra_ies_len, u8 oper_class,
 746                                    struct cfg80211_chan_def *chandef)
 747 {
 748         switch (action_code) {
 749         case WLAN_TDLS_SETUP_REQUEST:
 750         case WLAN_TDLS_SETUP_RESPONSE:
 751         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 752                 if (status_code == 0)
 753                         ieee80211_tdls_add_setup_start_ies(link,
 754                                                            skb, peer,
 755                                                            action_code,
 756                                                            initiator,
 757                                                            extra_ies,
 758                                                            extra_ies_len);
 759                 break;
 760         case WLAN_TDLS_SETUP_CONFIRM:
 761                 if (status_code == 0)
 762                         ieee80211_tdls_add_setup_cfm_ies(link, skb, peer,
 763                                                          initiator, extra_ies,
 764                                                          extra_ies_len);
 765                 break;
 766         case WLAN_TDLS_TEARDOWN:
 767         case WLAN_TDLS_DISCOVERY_REQUEST:
 768                 if (extra_ies_len)
 769                         skb_put_data(skb, extra_ies, extra_ies_len);
 770                 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
 771                         ieee80211_tdls_add_link_ie(link, skb,
 772                                                    peer, initiator);
 773                 break;
 774         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 775                 ieee80211_tdls_add_chan_switch_req_ies(link, skb, peer,
 776                                                        initiator, extra_ies,
 777                                                        extra_ies_len,
 778                                                        oper_class, chandef);
 779                 break;
 780         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 781                 ieee80211_tdls_add_chan_switch_resp_ies(link, skb, peer,
 782                                                         status_code,
 783                                                         initiator, extra_ies,
 784                                                         extra_ies_len);
 785                 break;
 786         }
 787
 788 }
 789
 790 static int
 791 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
 792                                struct ieee80211_link_data *link,
 793                                const u8 *peer, u8 action_code, u8 dialog_token,
 794                                u16 status_code, struct sk_buff *skb)
 795 {
 796         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 797         struct ieee80211_tdls_data *tf;
 798
 799         tf = skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
 800
 801         memcpy(tf->da, peer, ETH_ALEN);
 802         memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
 803         tf->ether_type = cpu_to_be16(ETH_P_TDLS);
 804         tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
 805
 806         /* network header is after the ethernet header */
 807         skb_set_network_header(skb, ETH_HLEN);
 808
 809         switch (action_code) {
 810         case WLAN_TDLS_SETUP_REQUEST:
 811                 tf->category = WLAN_CATEGORY_TDLS;
 812                 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
 813
 814                 skb_put(skb, sizeof(tf->u.setup_req));
 815                 tf->u.setup_req.dialog_token = dialog_token;
 816                 tf->u.setup_req.capability =
 817                         cpu_to_le16(ieee80211_get_tdls_sta_capab(link,
 818                                                                  status_code));
 819                 break;
 820         case WLAN_TDLS_SETUP_RESPONSE:
 821                 tf->category = WLAN_CATEGORY_TDLS;
 822                 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
 823
 824                 skb_put(skb, sizeof(tf->u.setup_resp));
 825                 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
 826                 tf->u.setup_resp.dialog_token = dialog_token;
 827                 tf->u.setup_resp.capability =
 828                         cpu_to_le16(ieee80211_get_tdls_sta_capab(link,
 829                                                                  status_code));
 830                 break;
 831         case WLAN_TDLS_SETUP_CONFIRM:
 832                 tf->category = WLAN_CATEGORY_TDLS;
 833                 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
 834
 835                 skb_put(skb, sizeof(tf->u.setup_cfm));
 836                 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
 837                 tf->u.setup_cfm.dialog_token = dialog_token;
 838                 break;
 839         case WLAN_TDLS_TEARDOWN:
 840                 tf->category = WLAN_CATEGORY_TDLS;
 841                 tf->action_code = WLAN_TDLS_TEARDOWN;
 842
 843                 skb_put(skb, sizeof(tf->u.teardown));
 844                 tf->u.teardown.reason_code = cpu_to_le16(status_code);
 845                 break;
 846         case WLAN_TDLS_DISCOVERY_REQUEST:
 847                 tf->category = WLAN_CATEGORY_TDLS;
 848                 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
 849
 850                 skb_put(skb, sizeof(tf->u.discover_req));
 851                 tf->u.discover_req.dialog_token = dialog_token;
 852                 break;
 853         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 854                 tf->category = WLAN_CATEGORY_TDLS;
 855                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
 856
 857                 skb_put(skb, sizeof(tf->u.chan_switch_req));
 858                 break;
 859         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 860                 tf->category = WLAN_CATEGORY_TDLS;
 861                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
 862
 863                 skb_put(skb, sizeof(tf->u.chan_switch_resp));
 864                 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
 865                 break;
 866         default:
 867                 return -EINVAL;
 868         }
 869
 870         return 0;
 871 }
 872
 873 static int
 874 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
 875                            const u8 *peer, struct ieee80211_link_data *link,
 876                            u8 action_code, u8 dialog_token,
 877                            u16 status_code, struct sk_buff *skb)
 878 {
 879         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 880         struct ieee80211_mgmt *mgmt;
 881
 882         mgmt = skb_put_zero(skb, 24);
 883         memcpy(mgmt->da, peer, ETH_ALEN);
 884         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 885         memcpy(mgmt->bssid, link->u.mgd.bssid, ETH_ALEN);
 886         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 887                                           IEEE80211_STYPE_ACTION);
 888
 889         switch (action_code) {
 890         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 891                 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
 892                 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
 893                 mgmt->u.action.u.tdls_discover_resp.action_code =
 894                         WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
 895                 mgmt->u.action.u.tdls_discover_resp.dialog_token =
 896                         dialog_token;
 897                 mgmt->u.action.u.tdls_discover_resp.capability =
 898                         cpu_to_le16(ieee80211_get_tdls_sta_capab(link,
 899                                                                  status_code));
 900                 break;
 901         default:
 902                 return -EINVAL;
 903         }
 904
 905         return 0;
 906 }
 907
 908 static struct sk_buff *
 909 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
 910                                       const u8 *peer, int link_id,
 911                                       u8 action_code, u8 dialog_token,
 912                                       u16 status_code, bool initiator,
 913                                       const u8 *extra_ies, size_t extra_ies_len,
 914                                       u8 oper_class,
 915                                       struct cfg80211_chan_def *chandef)
 916 {
 917         struct ieee80211_local *local = sdata->local;
 918         struct sk_buff *skb;
 919         int ret;
 920         struct ieee80211_link_data *link;
 921
 922         link_id = link_id >= 0 ? link_id : 0;
 923         rcu_read_lock();
 924         link = rcu_dereference(sdata->link[link_id]);
 925         if (WARN_ON(!link))
 926                 goto unlock;
 927
 928         skb = netdev_alloc_skb(sdata->dev,
 929                                local->hw.extra_tx_headroom +
 930                                max(sizeof(struct ieee80211_mgmt),
 931                                    sizeof(struct ieee80211_tdls_data)) +
 932                                50 + /* supported rates */
 933                                10 + /* ext capab */
 934                                26 + /* max(WMM-info, WMM-param) */
 935                                2 + max(sizeof(struct ieee80211_ht_cap),
 936                                        sizeof(struct ieee80211_ht_operation)) +
 937                                2 + max(sizeof(struct ieee80211_vht_cap),
 938                                        sizeof(struct ieee80211_vht_operation)) +
 939                                2 + 1 + sizeof(struct ieee80211_he_cap_elem) +
 940                                        sizeof(struct ieee80211_he_mcs_nss_supp) +
 941                                        IEEE80211_HE_PPE_THRES_MAX_LEN +
 942                                2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
 943                                2 + 1 + sizeof(struct ieee80211_eht_cap_elem) +
 944                                        sizeof(struct ieee80211_eht_mcs_nss_supp) +
 945                                        IEEE80211_EHT_PPE_THRES_MAX_LEN +
 946                                50 + /* supported channels */
 947                                3 + /* 40/20 BSS coex */
 948                                4 + /* AID */
 949                                4 + /* oper classes */
 950                                extra_ies_len +
 951                                sizeof(struct ieee80211_tdls_lnkie));
 952         if (!skb)
 953                 goto unlock;
 954
 955         skb_reserve(skb, local->hw.extra_tx_headroom);
 956
 957         switch (action_code) {
 958         case WLAN_TDLS_SETUP_REQUEST:
 959         case WLAN_TDLS_SETUP_RESPONSE:
 960         case WLAN_TDLS_SETUP_CONFIRM:
 961         case WLAN_TDLS_TEARDOWN:
 962         case WLAN_TDLS_DISCOVERY_REQUEST:
 963         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 964         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 965                 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
 966                                                      sdata->dev, link, peer,
 967                                                      action_code, dialog_token,
 968                                                      status_code, skb);
 969                 break;
 970         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 971                 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
 972                                                  peer, link, action_code,
 973                                                  dialog_token, status_code,
 974                                                  skb);
 975                 break;
 976         default:
 977                 ret = -EOPNOTSUPP;
 978                 break;
 979         }
 980
 981         if (ret < 0)
 982                 goto fail;
 983
 984         ieee80211_tdls_add_ies(link, skb, peer, action_code, status_code,
 985                                initiator, extra_ies, extra_ies_len, oper_class,
 986                                chandef);
 987         rcu_read_unlock();
 988         return skb;
 989
 990 fail:
 991         dev_kfree_skb(skb);
 992 unlock:
 993         rcu_read_unlock();
 994         return NULL;
 995 }
 996
 997 static int
 998 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
 999                                 const u8 *peer, int link_id,
1000                                 u8 action_code, u8 dialog_token,
1001                                 u16 status_code, u32 peer_capability,
1002                                 bool initiator, const u8 *extra_ies,
1003                                 size_t extra_ies_len, u8 oper_class,
1004                                 struct cfg80211_chan_def *chandef)
1005 {
1006         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1007         struct sk_buff *skb = NULL;
1008         struct sta_info *sta;
1009         u32 flags = 0;
1010         int ret = 0;
1011
1012         rcu_read_lock();
1013         sta = sta_info_get(sdata, peer);
1014
1015         /* infer the initiator if we can, to support old userspace */
1016         switch (action_code) {
1017         case WLAN_TDLS_SETUP_REQUEST:
1018                 if (sta) {
1019                         set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
1020                         sta->sta.tdls_initiator = false;
1021                 }
1022                 fallthrough;
1023         case WLAN_TDLS_SETUP_CONFIRM:
1024         case WLAN_TDLS_DISCOVERY_REQUEST:
1025                 initiator = true;
1026                 break;
1027         case WLAN_TDLS_SETUP_RESPONSE:
1028                 /*
1029                  * In some testing scenarios, we send a request and response.
1030                  * Make the last packet sent take effect for the initiator
1031                  * value.
1032                  */
1033                 if (sta) {
1034                         clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
1035                         sta->sta.tdls_initiator = true;
1036                 }
1037                 fallthrough;
1038         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1039                 initiator = false;
1040                 break;
1041         case WLAN_TDLS_TEARDOWN:
1042         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1043         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1044                 /* any value is ok */
1045                 break;
1046         default:
1047                 ret = -EOPNOTSUPP;
1048                 break;
1049         }
1050
1051         if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
1052                 initiator = true;
1053
1054         rcu_read_unlock();
1055         if (ret < 0)
1056                 goto fail;
1057
1058         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer,
1059                                                     link_id, action_code,
1060                                                     dialog_token, status_code,
1061                                                     initiator, extra_ies,
1062                                                     extra_ies_len, oper_class,
1063                                                     chandef);
1064         if (!skb) {
1065                 ret = -EINVAL;
1066                 goto fail;
1067         }
1068
1069         if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
1070                 ieee80211_tx_skb_tid(sdata, skb, 7, link_id);
1071                 return 0;
1072         }
1073
1074         /*
1075          * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1076          * we should default to AC_VI.
1077          */
1078         switch (action_code) {
1079         case WLAN_TDLS_SETUP_REQUEST:
1080         case WLAN_TDLS_SETUP_RESPONSE:
1081                 skb->priority = 256 + 2;
1082                 break;
1083         default:
1084                 skb->priority = 256 + 5;
1085                 break;
1086         }
1087
1088         /*
1089          * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1090          * Later, if no ACK is returned from peer, we will re-send the teardown
1091          * packet through the AP.
1092          */
1093         if ((action_code == WLAN_TDLS_TEARDOWN) &&
1094             ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1095                 bool try_resend; /* Should we keep skb for possible resend */
1096
1097                 /* If not sending directly to peer - no point in keeping skb */
1098                 rcu_read_lock();
1099                 sta = sta_info_get(sdata, peer);
1100                 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1101                 rcu_read_unlock();
1102
1103                 spin_lock_bh(&sdata->u.mgd.teardown_lock);
1104                 if (try_resend && !sdata->u.mgd.teardown_skb) {
1105                         /* Mark it as requiring TX status callback  */
1106                         flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1107                                  IEEE80211_TX_INTFL_MLME_CONN_TX;
1108
1109                         /*
1110                          * skb is copied since mac80211 will later set
1111                          * properties that might not be the same as the AP,
1112                          * such as encryption, QoS, addresses, etc.
1113                          *
1114                          * No problem if skb_copy() fails, so no need to check.
1115                          */
1116                         sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1117                         sdata->u.mgd.orig_teardown_skb = skb;
1118                 }
1119                 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1120         }
1121
1122         /* disable bottom halves when entering the Tx path */
1123         local_bh_disable();
1124         __ieee80211_subif_start_xmit(skb, dev, flags,
1125                                      IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL);
1126         local_bh_enable();
1127
1128         return ret;
1129
1130 fail:
1131         dev_kfree_skb(skb);
1132         return ret;
1133 }
1134
1135 static int
1136 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1137                           const u8 *peer, int link_id,
1138                           u8 action_code, u8 dialog_token,
1139                           u16 status_code, u32 peer_capability, bool initiator,
1140                           const u8 *extra_ies, size_t extra_ies_len)
1141 {
1142         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1143         struct ieee80211_local *local = sdata->local;
1144         enum ieee80211_smps_mode smps_mode =
1145                 sdata->deflink.u.mgd.driver_smps_mode;
1146         int ret;
1147
1148         /* don't support setup with forced SMPS mode that's not off */
1149         if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1150             smps_mode != IEEE80211_SMPS_OFF) {
1151                 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1152                          smps_mode);
1153                 return -EOPNOTSUPP;
1154         }
1155
1156         lockdep_assert_wiphy(local->hw.wiphy);
1157
1158         /* we don't support concurrent TDLS peer setups */
1159         if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1160             !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1161                 ret = -EBUSY;
1162                 goto out_unlock;
1163         }
1164
1165         /*
1166          * make sure we have a STA representing the peer so we drop or buffer
1167          * non-TDLS-setup frames to the peer. We can't send other packets
1168          * during setup through the AP path.
1169          * Allow error packets to be sent - sometimes we don't even add a STA
1170          * before failing the setup.
1171          */
1172         if (status_code == 0) {
1173                 rcu_read_lock();
1174                 if (!sta_info_get(sdata, peer)) {
1175                         rcu_read_unlock();
1176                         ret = -ENOLINK;
1177                         goto out_unlock;
1178                 }
1179                 rcu_read_unlock();
1180         }
1181
1182         ieee80211_flush_queues(local, sdata, false);
1183         memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1184
1185         /* we cannot take the mutex while preparing the setup packet */
1186         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1187                                               link_id, action_code,
1188                                               dialog_token, status_code,
1189                                               peer_capability, initiator,
1190                                               extra_ies, extra_ies_len, 0,
1191                                               NULL);
1192         if (ret < 0) {
1193                 eth_zero_addr(sdata->u.mgd.tdls_peer);
1194                 return ret;
1195         }
1196
1197         wiphy_delayed_work_queue(sdata->local->hw.wiphy,
1198                                  &sdata->u.mgd.tdls_peer_del_work,
1199                                  TDLS_PEER_SETUP_TIMEOUT);
1200         return 0;
1201
1202 out_unlock:
1203         return ret;
1204 }
1205
1206 static int
1207 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1208                              const u8 *peer, int link_id,
1209                              u8 action_code, u8 dialog_token,
1210                              u16 status_code, u32 peer_capability,
1211                              bool initiator, const u8 *extra_ies,
1212                              size_t extra_ies_len)
1213 {
1214         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1215         struct ieee80211_local *local = sdata->local;
1216         struct sta_info *sta;
1217         int ret;
1218
1219         /*
1220          * No packets can be transmitted to the peer via the AP during setup -
1221          * the STA is set as a TDLS peer, but is not authorized.
1222          * During teardown, we prevent direct transmissions by stopping the
1223          * queues and flushing all direct packets.
1224          */
1225         ieee80211_stop_vif_queues(local, sdata,
1226                                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1227         ieee80211_flush_queues(local, sdata, false);
1228
1229         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1230                                               link_id, action_code,
1231                                               dialog_token, status_code,
1232                                               peer_capability, initiator,
1233                                               extra_ies, extra_ies_len, 0,
1234                                               NULL);
1235         if (ret < 0)
1236                 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1237                           ret);
1238
1239         /*
1240          * Remove the STA AUTH flag to force further traffic through the AP. If
1241          * the STA was unreachable, it was already removed.
1242          */
1243         rcu_read_lock();
1244         sta = sta_info_get(sdata, peer);
1245         if (sta)
1246                 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1247         rcu_read_unlock();
1248
1249         ieee80211_wake_vif_queues(local, sdata,
1250                                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1251
1252         return 0;
1253 }
1254
1255 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1256                         const u8 *peer, int link_id,
1257                         u8 action_code, u8 dialog_token, u16 status_code,
1258                         u32 peer_capability, bool initiator,
1259                         const u8 *extra_ies, size_t extra_ies_len)
1260 {
1261         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1262         int ret;
1263
1264         if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1265                 return -EOPNOTSUPP;
1266
1267         /* make sure we are in managed mode, and associated */
1268         if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1269             !sdata->u.mgd.associated)
1270                 return -EINVAL;
1271
1272         switch (action_code) {
1273         case WLAN_TDLS_SETUP_REQUEST:
1274         case WLAN_TDLS_SETUP_RESPONSE:
1275                 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer,
1276                                                 link_id, action_code,
1277                                                 dialog_token, status_code,
1278                                                 peer_capability, initiator,
1279                                                 extra_ies, extra_ies_len);
1280                 break;
1281         case WLAN_TDLS_TEARDOWN:
1282                 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, link_id,
1283                                                    action_code, dialog_token,
1284                                                    status_code,
1285                                                    peer_capability, initiator,
1286                                                    extra_ies, extra_ies_len);
1287                 break;
1288         case WLAN_TDLS_DISCOVERY_REQUEST:
1289                 /*
1290                  * Protect the discovery so we can hear the TDLS discovery
1291                  * response frame. It is transmitted directly and not buffered
1292                  * by the AP.
1293                  */
1294                 drv_mgd_protect_tdls_discover(sdata->local, sdata, link_id);
1295                 fallthrough;
1296         case WLAN_TDLS_SETUP_CONFIRM:
1297         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1298                 /* no special handling */
1299                 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1300                                                       link_id, action_code,
1301                                                       dialog_token,
1302                                                       status_code,
1303                                                       peer_capability,
1304                                                       initiator, extra_ies,
1305                                                       extra_ies_len, 0, NULL);
1306                 break;
1307         default:
1308                 ret = -EOPNOTSUPP;
1309                 break;
1310         }
1311
1312         tdls_dbg(sdata, "TDLS mgmt action %d peer %pM link_id %d status %d\n",
1313                  action_code, peer, link_id, ret);
1314         return ret;
1315 }
1316
1317 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1318                                          struct sta_info *sta)
1319 {
1320         struct ieee80211_local *local = sdata->local;
1321         struct ieee80211_chanctx_conf *conf;
1322         struct ieee80211_chanctx *ctx;
1323         enum nl80211_chan_width width;
1324         struct ieee80211_supported_band *sband;
1325
1326         lockdep_assert_wiphy(local->hw.wiphy);
1327
1328         conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf,
1329                                          lockdep_is_held(&local->hw.wiphy->mtx));
1330         if (conf) {
1331                 width = conf->def.width;
1332                 sband = local->hw.wiphy->bands[conf->def.chan->band];
1333                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1334                 ieee80211_recalc_chanctx_chantype(local, ctx);
1335
1336                 /* if width changed and a peer is given, update its BW */
1337                 if (width != conf->def.width && sta &&
1338                     test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1339                         enum ieee80211_sta_rx_bandwidth bw;
1340
1341                         bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1342                         bw = min(bw, ieee80211_sta_cap_rx_bw(&sta->deflink));
1343                         if (bw != sta->sta.deflink.bandwidth) {
1344                                 sta->sta.deflink.bandwidth = bw;
1345                                 rate_control_rate_update(local, sband, sta, 0,
1346                                                          IEEE80211_RC_BW_CHANGED);
1347                                 /*
1348                                  * if a TDLS peer BW was updated, we need to
1349                                  * recalc the chandef width again, to get the
1350                                  * correct chanctx min_def
1351                                  */
1352                                 ieee80211_recalc_chanctx_chantype(local, ctx);
1353                         }
1354                 }
1355
1356         }
1357 }
1358
1359 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1360 {
1361         struct sta_info *sta;
1362         bool result = false;
1363
1364         rcu_read_lock();
1365         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1366                 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1367                     !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1368                     !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1369                     !sta->sta.deflink.ht_cap.ht_supported)
1370                         continue;
1371                 result = true;
1372                 break;
1373         }
1374         rcu_read_unlock();
1375
1376         return result;
1377 }
1378
1379 static void
1380 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1381                                    struct sta_info *sta)
1382 {
1383         bool tdls_ht;
1384         u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1385                          IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1386                          IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1387         u16 opmode;
1388
1389         /* Nothing to do if the BSS connection uses (at least) HT */
1390         if (sdata->deflink.u.mgd.conn.mode >= IEEE80211_CONN_MODE_HT)
1391                 return;
1392
1393         tdls_ht = (sta && sta->sta.deflink.ht_cap.ht_supported) ||
1394                   iee80211_tdls_have_ht_peers(sdata);
1395
1396         opmode = sdata->vif.bss_conf.ht_operation_mode;
1397
1398         if (tdls_ht)
1399                 opmode |= protection;
1400         else
1401                 opmode &= ~protection;
1402
1403         if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1404                 return;
1405
1406         sdata->vif.bss_conf.ht_operation_mode = opmode;
1407         ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1408                                           BSS_CHANGED_HT);
1409 }
1410
1411 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1412                         const u8 *peer, enum nl80211_tdls_operation oper)
1413 {
1414         struct sta_info *sta;
1415         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1416         struct ieee80211_local *local = sdata->local;
1417         int ret;
1418
1419         lockdep_assert_wiphy(local->hw.wiphy);
1420
1421         if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1422                 return -EOPNOTSUPP;
1423
1424         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1425                 return -EINVAL;
1426
1427         switch (oper) {
1428         case NL80211_TDLS_ENABLE_LINK:
1429         case NL80211_TDLS_DISABLE_LINK:
1430                 break;
1431         case NL80211_TDLS_TEARDOWN:
1432         case NL80211_TDLS_SETUP:
1433         case NL80211_TDLS_DISCOVERY_REQ:
1434                 /* We don't support in-driver setup/teardown/discovery */
1435                 return -EOPNOTSUPP;
1436         }
1437
1438         /* protect possible bss_conf changes and avoid concurrency in
1439          * ieee80211_bss_info_change_notify()
1440          */
1441         tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1442
1443         switch (oper) {
1444         case NL80211_TDLS_ENABLE_LINK:
1445                 if (sdata->vif.bss_conf.csa_active) {
1446                         tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1447                         return -EBUSY;
1448                 }
1449
1450                 sta = sta_info_get(sdata, peer);
1451                 if (!sta)
1452                         return -ENOLINK;
1453
1454                 iee80211_tdls_recalc_chanctx(sdata, sta);
1455                 iee80211_tdls_recalc_ht_protection(sdata, sta);
1456
1457                 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1458
1459                 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1460                              !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1461                 break;
1462         case NL80211_TDLS_DISABLE_LINK:
1463                 /*
1464                  * The teardown message in ieee80211_tdls_mgmt_teardown() was
1465                  * created while the queues were stopped, so it might still be
1466                  * pending. Before flushing the queues we need to be sure the
1467                  * message is handled by the tasklet handling pending messages,
1468                  * otherwise we might start destroying the station before
1469                  * sending the teardown packet.
1470                  * Note that this only forces the tasklet to flush pendings -
1471                  * not to stop the tasklet from rescheduling itself.
1472                  */
1473                 tasklet_kill(&local->tx_pending_tasklet);
1474                 /* flush a potentially queued teardown packet */
1475                 ieee80211_flush_queues(local, sdata, false);
1476
1477                 ret = sta_info_destroy_addr(sdata, peer);
1478
1479                 iee80211_tdls_recalc_ht_protection(sdata, NULL);
1480
1481                 iee80211_tdls_recalc_chanctx(sdata, NULL);
1482                 if (ret)
1483                         return ret;
1484                 break;
1485         default:
1486                 return -EOPNOTSUPP;
1487         }
1488
1489         if (ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1490                 wiphy_delayed_work_cancel(sdata->local->hw.wiphy,
1491                                           &sdata->u.mgd.tdls_peer_del_work);
1492                 eth_zero_addr(sdata->u.mgd.tdls_peer);
1493         }
1494
1495         wiphy_work_queue(sdata->local->hw.wiphy,
1496                          &sdata->deflink.u.mgd.request_smps_work);
1497
1498         return 0;
1499 }
1500
1501 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1502                                  enum nl80211_tdls_operation oper,
1503                                  u16 reason_code, gfp_t gfp)
1504 {
1505         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1506
1507         if (vif->type != NL80211_IFTYPE_STATION || !vif->cfg.assoc) {
1508                 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1509                           oper);
1510                 return;
1511         }
1512
1513         cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1514 }
1515 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1516
1517 static void
1518 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1519 {
1520         struct ieee80211_ch_switch_timing *ch_sw;
1521
1522         *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1523         *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1524
1525         ch_sw = (void *)buf;
1526         ch_sw->switch_time = cpu_to_le16(switch_time);
1527         ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1528 }
1529
1530 /* find switch timing IE in SKB ready for Tx */
1531 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1532 {
1533         struct ieee80211_tdls_data *tf;
1534         const u8 *ie_start;
1535
1536         /*
1537          * Get the offset for the new location of the switch timing IE.
1538          * The SKB network header will now point to the "payload_type"
1539          * element of the TDLS data frame struct.
1540          */
1541         tf = container_of(skb->data + skb_network_offset(skb),
1542                           struct ieee80211_tdls_data, payload_type);
1543         ie_start = tf->u.chan_switch_req.variable;
1544         return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1545                                 skb->len - (ie_start - skb->data));
1546 }
1547
1548 static struct sk_buff *
1549 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1550                               struct cfg80211_chan_def *chandef,
1551                               u32 *ch_sw_tm_ie_offset)
1552 {
1553         struct ieee80211_sub_if_data *sdata = sta->sdata;
1554         u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1555                      2 + sizeof(struct ieee80211_ch_switch_timing)];
1556         int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1557         u8 *pos = extra_ies;
1558         struct sk_buff *skb;
1559         int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0;
1560
1561         /*
1562          * if chandef points to a wide channel add a Secondary-Channel
1563          * Offset information element
1564          */
1565         if (chandef->width == NL80211_CHAN_WIDTH_40) {
1566                 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1567                 bool ht40plus;
1568
1569                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1570                 *pos++ = sizeof(*sec_chan_ie);
1571                 sec_chan_ie = (void *)pos;
1572
1573                 ht40plus = cfg80211_get_chandef_type(chandef) ==
1574                                                         NL80211_CHAN_HT40PLUS;
1575                 sec_chan_ie->sec_chan_offs = ht40plus ?
1576                                              IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1577                                              IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1578                 pos += sizeof(*sec_chan_ie);
1579
1580                 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1581         }
1582
1583         /* just set the values to 0, this is a template */
1584         iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1585
1586         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1587                                               link_id,
1588                                               WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1589                                               0, 0, !sta->sta.tdls_initiator,
1590                                               extra_ies, extra_ies_len,
1591                                               oper_class, chandef);
1592         if (!skb)
1593                 return NULL;
1594
1595         skb = ieee80211_build_data_template(sdata, skb, 0);
1596         if (IS_ERR(skb)) {
1597                 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1598                 return NULL;
1599         }
1600
1601         if (ch_sw_tm_ie_offset) {
1602                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1603
1604                 if (!tm_ie) {
1605                         tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1606                         dev_kfree_skb_any(skb);
1607                         return NULL;
1608                 }
1609
1610                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1611         }
1612
1613         tdls_dbg(sdata,
1614                  "TDLS channel switch request template for %pM ch %d width %d\n",
1615                  sta->sta.addr, chandef->chan->center_freq, chandef->width);
1616         return skb;
1617 }
1618
1619 int
1620 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1621                               const u8 *addr, u8 oper_class,
1622                               struct cfg80211_chan_def *chandef)
1623 {
1624         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1625         struct ieee80211_local *local = sdata->local;
1626         struct sta_info *sta;
1627         struct sk_buff *skb = NULL;
1628         u32 ch_sw_tm_ie;
1629         int ret;
1630
1631         lockdep_assert_wiphy(local->hw.wiphy);
1632
1633         if (chandef->chan->freq_offset)
1634                 /* this may work, but is untested */
1635                 return -EOPNOTSUPP;
1636
1637         sta = sta_info_get(sdata, addr);
1638         if (!sta) {
1639                 tdls_dbg(sdata,
1640                          "Invalid TDLS peer %pM for channel switch request\n",
1641                          addr);
1642                 ret = -ENOENT;
1643                 goto out;
1644         }
1645
1646         if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1647                 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1648                          addr);
1649                 ret = -EOPNOTSUPP;
1650                 goto out;
1651         }
1652
1653         skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1654                                             &ch_sw_tm_ie);
1655         if (!skb) {
1656                 ret = -ENOENT;
1657                 goto out;
1658         }
1659
1660         ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1661                                       chandef, skb, ch_sw_tm_ie);
1662         if (!ret)
1663                 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1664
1665 out:
1666         dev_kfree_skb_any(skb);
1667         return ret;
1668 }
1669
1670 void
1671 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1672                                      struct net_device *dev,
1673                                      const u8 *addr)
1674 {
1675         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1676         struct ieee80211_local *local = sdata->local;
1677         struct sta_info *sta;
1678
1679         lockdep_assert_wiphy(local->hw.wiphy);
1680
1681         sta = sta_info_get(sdata, addr);
1682         if (!sta) {
1683                 tdls_dbg(sdata,
1684                          "Invalid TDLS peer %pM for channel switch cancel\n",
1685                          addr);
1686                 return;
1687         }
1688
1689         if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1690                 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1691                          addr);
1692                 return;
1693         }
1694
1695         drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1696         clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1697 }
1698
1699 static struct sk_buff *
1700 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1701                                    u32 *ch_sw_tm_ie_offset)
1702 {
1703         struct ieee80211_sub_if_data *sdata = sta->sdata;
1704         struct sk_buff *skb;
1705         u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1706         int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0;
1707
1708         /* initial timing are always zero in the template */
1709         iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1710
1711         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1712                                         link_id,
1713                                         WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1714                                         0, 0, !sta->sta.tdls_initiator,
1715                                         extra_ies, sizeof(extra_ies), 0, NULL);
1716         if (!skb)
1717                 return NULL;
1718
1719         skb = ieee80211_build_data_template(sdata, skb, 0);
1720         if (IS_ERR(skb)) {
1721                 tdls_dbg(sdata,
1722                          "Failed building TDLS channel switch resp frame\n");
1723                 return NULL;
1724         }
1725
1726         if (ch_sw_tm_ie_offset) {
1727                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1728
1729                 if (!tm_ie) {
1730                         tdls_dbg(sdata,
1731                                  "No switch timing IE in TDLS switch resp\n");
1732                         dev_kfree_skb_any(skb);
1733                         return NULL;
1734                 }
1735
1736                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1737         }
1738
1739         tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1740                  sta->sta.addr);
1741         return skb;
1742 }
1743
1744 static int
1745 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1746                                            struct sk_buff *skb)
1747 {
1748         struct ieee80211_local *local = sdata->local;
1749         struct ieee802_11_elems *elems = NULL;
1750         struct sta_info *sta;
1751         struct ieee80211_tdls_data *tf = (void *)skb->data;
1752         bool local_initiator;
1753         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1754         int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1755         struct ieee80211_tdls_ch_sw_params params = {};
1756         int ret;
1757
1758         lockdep_assert_wiphy(local->hw.wiphy);
1759
1760         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1761         params.timestamp = rx_status->device_timestamp;
1762
1763         if (skb->len < baselen) {
1764                 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1765                          skb->len);
1766                 return -EINVAL;
1767         }
1768
1769         sta = sta_info_get(sdata, tf->sa);
1770         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1771                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1772                          tf->sa);
1773                 ret = -EINVAL;
1774                 goto out;
1775         }
1776
1777         params.sta = &sta->sta;
1778         params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1779         if (params.status != 0) {
1780                 ret = 0;
1781                 goto call_drv;
1782         }
1783
1784         elems = ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1785                                        skb->len - baselen, false, NULL);
1786         if (!elems) {
1787                 ret = -ENOMEM;
1788                 goto out;
1789         }
1790
1791         if (elems->parse_error) {
1792                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1793                 ret = -EINVAL;
1794                 goto out;
1795         }
1796
1797         if (!elems->ch_sw_timing || !elems->lnk_id) {
1798                 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1799                 ret = -EINVAL;
1800                 goto out;
1801         }
1802
1803         /* validate the initiator is set correctly */
1804         local_initiator =
1805                 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1806         if (local_initiator == sta->sta.tdls_initiator) {
1807                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1808                 ret = -EINVAL;
1809                 goto out;
1810         }
1811
1812         params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time);
1813         params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout);
1814
1815         params.tmpl_skb =
1816                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1817         if (!params.tmpl_skb) {
1818                 ret = -ENOENT;
1819                 goto out;
1820         }
1821
1822         ret = 0;
1823 call_drv:
1824         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1825
1826         tdls_dbg(sdata,
1827                  "TDLS channel switch response received from %pM status %d\n",
1828                  tf->sa, params.status);
1829
1830 out:
1831         dev_kfree_skb_any(params.tmpl_skb);
1832         kfree(elems);
1833         return ret;
1834 }
1835
1836 static int
1837 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1838                                           struct sk_buff *skb)
1839 {
1840         struct ieee80211_local *local = sdata->local;
1841         struct ieee802_11_elems *elems;
1842         struct cfg80211_chan_def chandef;
1843         struct ieee80211_channel *chan;
1844         enum nl80211_channel_type chan_type;
1845         int freq;
1846         u8 target_channel, oper_class;
1847         bool local_initiator;
1848         struct sta_info *sta;
1849         enum nl80211_band band;
1850         struct ieee80211_tdls_data *tf = (void *)skb->data;
1851         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1852         int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1853         struct ieee80211_tdls_ch_sw_params params = {};
1854         int ret = 0;
1855
1856         lockdep_assert_wiphy(local->hw.wiphy);
1857
1858         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1859         params.timestamp = rx_status->device_timestamp;
1860
1861         if (skb->len < baselen) {
1862                 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1863                          skb->len);
1864                 return -EINVAL;
1865         }
1866
1867         target_channel = tf->u.chan_switch_req.target_channel;
1868         oper_class = tf->u.chan_switch_req.oper_class;
1869
1870         /*
1871          * We can't easily infer the channel band. The operating class is
1872          * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1873          * solution here is to treat channels with number >14 as 5GHz ones,
1874          * and specifically check for the (oper_class, channel) combinations
1875          * where this doesn't hold. These are thankfully unique according to
1876          * IEEE802.11-2012.
1877          * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1878          * valid here.
1879          */
1880         if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1881              oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1882              target_channel < 14)
1883                 band = NL80211_BAND_5GHZ;
1884         else
1885                 band = target_channel < 14 ? NL80211_BAND_2GHZ :
1886                                              NL80211_BAND_5GHZ;
1887
1888         freq = ieee80211_channel_to_frequency(target_channel, band);
1889         if (freq == 0) {
1890                 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1891                          target_channel);
1892                 return -EINVAL;
1893         }
1894
1895         chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1896         if (!chan) {
1897                 tdls_dbg(sdata,
1898                          "Unsupported channel for TDLS chan switch: %d\n",
1899                          target_channel);
1900                 return -EINVAL;
1901         }
1902
1903         elems = ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1904                                        skb->len - baselen, false, NULL);
1905         if (!elems)
1906                 return -ENOMEM;
1907
1908         if (elems->parse_error) {
1909                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1910                 ret = -EINVAL;
1911                 goto free;
1912         }
1913
1914         if (!elems->ch_sw_timing || !elems->lnk_id) {
1915                 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1916                 ret = -EINVAL;
1917                 goto free;
1918         }
1919
1920         if (!elems->sec_chan_offs) {
1921                 chan_type = NL80211_CHAN_HT20;
1922         } else {
1923                 switch (elems->sec_chan_offs->sec_chan_offs) {
1924                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1925                         chan_type = NL80211_CHAN_HT40PLUS;
1926                         break;
1927                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1928                         chan_type = NL80211_CHAN_HT40MINUS;
1929                         break;
1930                 default:
1931                         chan_type = NL80211_CHAN_HT20;
1932                         break;
1933                 }
1934         }
1935
1936         cfg80211_chandef_create(&chandef, chan, chan_type);
1937
1938         /* we will be active on the TDLS link */
1939         if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1940                                            sdata->wdev.iftype)) {
1941                 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1942                 ret = -EINVAL;
1943                 goto free;
1944         }
1945
1946         sta = sta_info_get(sdata, tf->sa);
1947         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1948                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1949                          tf->sa);
1950                 ret = -EINVAL;
1951                 goto out;
1952         }
1953
1954         params.sta = &sta->sta;
1955
1956         /* validate the initiator is set correctly */
1957         local_initiator =
1958                 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1959         if (local_initiator == sta->sta.tdls_initiator) {
1960                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1961                 ret = -EINVAL;
1962                 goto out;
1963         }
1964
1965         /* peer should have known better */
1966         if (!sta->sta.deflink.ht_cap.ht_supported && elems->sec_chan_offs &&
1967             elems->sec_chan_offs->sec_chan_offs) {
1968                 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1969                 ret = -EOPNOTSUPP;
1970                 goto out;
1971         }
1972
1973         params.chandef = &chandef;
1974         params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time);
1975         params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout);
1976
1977         params.tmpl_skb =
1978                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1979                                                    &params.ch_sw_tm_ie);
1980         if (!params.tmpl_skb) {
1981                 ret = -ENOENT;
1982                 goto out;
1983         }
1984
1985         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1986
1987         tdls_dbg(sdata,
1988                  "TDLS ch switch request received from %pM ch %d width %d\n",
1989                  tf->sa, params.chandef->chan->center_freq,
1990                  params.chandef->width);
1991 out:
1992         dev_kfree_skb_any(params.tmpl_skb);
1993 free:
1994         kfree(elems);
1995         return ret;
1996 }
1997
1998 void
1999 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
2000                                       struct sk_buff *skb)
2001 {
2002         struct ieee80211_tdls_data *tf = (void *)skb->data;
2003         struct wiphy *wiphy = sdata->local->hw.wiphy;
2004
2005         lockdep_assert_wiphy(wiphy);
2006
2007         /* make sure the driver supports it */
2008         if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
2009                 return;
2010
2011         /* we want to access the entire packet */
2012         if (skb_linearize(skb))
2013                 return;
2014         /*
2015          * The packet/size was already validated by mac80211 Rx path, only look
2016          * at the action type.
2017          */
2018         switch (tf->action_code) {
2019         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
2020                 ieee80211_process_tdls_channel_switch_req(sdata, skb);
2021                 break;
2022         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
2023                 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
2024                 break;
2025         default:
2026                 WARN_ON_ONCE(1);
2027                 return;
2028         }
2029 }
2030
2031 void ieee80211_teardown_tdls_peers(struct ieee80211_link_data *link)
2032 {
2033         struct ieee80211_sub_if_data *sdata = link->sdata;
2034         struct sta_info *sta;
2035         u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
2036
2037         rcu_read_lock();
2038         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
2039                 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
2040                     !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2041                         continue;
2042
2043                 if (sta->deflink.link_id != link->link_id)
2044                         continue;
2045
2046                 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
2047                                             NL80211_TDLS_TEARDOWN, reason,
2048                                             GFP_ATOMIC);
2049         }
2050         rcu_read_unlock();
2051 }
2052
2053 void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata,
2054                                       const u8 *peer, u16 reason)
2055 {
2056         struct ieee80211_sta *sta;
2057
2058         rcu_read_lock();
2059         sta = ieee80211_find_sta(&sdata->vif, peer);
2060         if (!sta || !sta->tdls) {
2061                 rcu_read_unlock();
2062                 return;
2063         }
2064         rcu_read_unlock();
2065
2066         tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n",
2067                  peer, reason,
2068                  ieee80211_get_reason_code_string(reason));
2069
2070         ieee80211_tdls_oper_request(&sdata->vif, peer,
2071                                     NL80211_TDLS_TEARDOWN,
2072                                     WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE,
2073                                     GFP_ATOMIC);
2074 }