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 work_struct *wk) 25 { 26 struct ieee80211_sub_if_data *sdata; 27 struct ieee80211_local *local; 28 29 sdata = container_of(wk, struct ieee80211_sub_if_data, 30 u.mgd.tdls_peer_del_work.work); 31 local = sdata->local; 32 33 mutex_lock(&local->mtx); 34 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) { 35 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer); 36 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer); 37 eth_zero_addr(sdata->u.mgd.tdls_peer); 38 } 39 mutex_unlock(&local->mtx); 40 } 41 42 static void ieee80211_tdls_add_ext_capab(struct ieee80211_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 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 mutex_lock(&local->mtx); 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 mutex_unlock(&local->mtx); 1212 1213 /* we cannot take the mutex while preparing the setup packet */ 1214 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1215 link_id, action_code, 1216 dialog_token, status_code, 1217 peer_capability, initiator, 1218 extra_ies, extra_ies_len, 0, 1219 NULL); 1220 if (ret < 0) { 1221 mutex_lock(&local->mtx); 1222 eth_zero_addr(sdata->u.mgd.tdls_peer); 1223 mutex_unlock(&local->mtx); 1224 return ret; 1225 } 1226 1227 ieee80211_queue_delayed_work(&sdata->local->hw, 1228 &sdata->u.mgd.tdls_peer_del_work, 1229 TDLS_PEER_SETUP_TIMEOUT); 1230 return 0; 1231 1232 out_unlock: 1233 mutex_unlock(&local->mtx); 1234 return ret; 1235 } 1236 1237 static int 1238 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev, 1239 const u8 *peer, int link_id, 1240 u8 action_code, u8 dialog_token, 1241 u16 status_code, u32 peer_capability, 1242 bool initiator, const u8 *extra_ies, 1243 size_t extra_ies_len) 1244 { 1245 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1246 struct ieee80211_local *local = sdata->local; 1247 struct sta_info *sta; 1248 int ret; 1249 1250 /* 1251 * No packets can be transmitted to the peer via the AP during setup - 1252 * the STA is set as a TDLS peer, but is not authorized. 1253 * During teardown, we prevent direct transmissions by stopping the 1254 * queues and flushing all direct packets. 1255 */ 1256 ieee80211_stop_vif_queues(local, sdata, 1257 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1258 ieee80211_flush_queues(local, sdata, false); 1259 1260 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1261 link_id, action_code, 1262 dialog_token, status_code, 1263 peer_capability, initiator, 1264 extra_ies, extra_ies_len, 0, 1265 NULL); 1266 if (ret < 0) 1267 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n", 1268 ret); 1269 1270 /* 1271 * Remove the STA AUTH flag to force further traffic through the AP. If 1272 * the STA was unreachable, it was already removed. 1273 */ 1274 rcu_read_lock(); 1275 sta = sta_info_get(sdata, peer); 1276 if (sta) 1277 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1278 rcu_read_unlock(); 1279 1280 ieee80211_wake_vif_queues(local, sdata, 1281 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1282 1283 return 0; 1284 } 1285 1286 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev, 1287 const u8 *peer, int link_id, 1288 u8 action_code, u8 dialog_token, u16 status_code, 1289 u32 peer_capability, bool initiator, 1290 const u8 *extra_ies, size_t extra_ies_len) 1291 { 1292 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1293 int ret; 1294 1295 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1296 return -ENOTSUPP; 1297 1298 /* make sure we are in managed mode, and associated */ 1299 if (sdata->vif.type != NL80211_IFTYPE_STATION || 1300 !sdata->u.mgd.associated) 1301 return -EINVAL; 1302 1303 switch (action_code) { 1304 case WLAN_TDLS_SETUP_REQUEST: 1305 case WLAN_TDLS_SETUP_RESPONSE: 1306 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, 1307 link_id, action_code, 1308 dialog_token, status_code, 1309 peer_capability, initiator, 1310 extra_ies, extra_ies_len); 1311 break; 1312 case WLAN_TDLS_TEARDOWN: 1313 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, link_id, 1314 action_code, dialog_token, 1315 status_code, 1316 peer_capability, initiator, 1317 extra_ies, extra_ies_len); 1318 break; 1319 case WLAN_TDLS_DISCOVERY_REQUEST: 1320 /* 1321 * Protect the discovery so we can hear the TDLS discovery 1322 * response frame. It is transmitted directly and not buffered 1323 * by the AP. 1324 */ 1325 drv_mgd_protect_tdls_discover(sdata->local, sdata); 1326 fallthrough; 1327 case WLAN_TDLS_SETUP_CONFIRM: 1328 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 1329 /* no special handling */ 1330 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1331 link_id, action_code, 1332 dialog_token, 1333 status_code, 1334 peer_capability, 1335 initiator, extra_ies, 1336 extra_ies_len, 0, NULL); 1337 break; 1338 default: 1339 ret = -EOPNOTSUPP; 1340 break; 1341 } 1342 1343 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM link_id %d status %d\n", 1344 action_code, peer, link_id, ret); 1345 return ret; 1346 } 1347 1348 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata, 1349 struct sta_info *sta) 1350 { 1351 struct ieee80211_local *local = sdata->local; 1352 struct ieee80211_chanctx_conf *conf; 1353 struct ieee80211_chanctx *ctx; 1354 enum nl80211_chan_width width; 1355 struct ieee80211_supported_band *sband; 1356 1357 mutex_lock(&local->chanctx_mtx); 1358 conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf, 1359 lockdep_is_held(&local->chanctx_mtx)); 1360 if (conf) { 1361 width = conf->def.width; 1362 sband = local->hw.wiphy->bands[conf->def.chan->band]; 1363 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1364 ieee80211_recalc_chanctx_chantype(local, ctx); 1365 1366 /* if width changed and a peer is given, update its BW */ 1367 if (width != conf->def.width && sta && 1368 test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) { 1369 enum ieee80211_sta_rx_bandwidth bw; 1370 1371 bw = ieee80211_chan_width_to_rx_bw(conf->def.width); 1372 bw = min(bw, ieee80211_sta_cap_rx_bw(&sta->deflink)); 1373 if (bw != sta->sta.deflink.bandwidth) { 1374 sta->sta.deflink.bandwidth = bw; 1375 rate_control_rate_update(local, sband, sta, 0, 1376 IEEE80211_RC_BW_CHANGED); 1377 /* 1378 * if a TDLS peer BW was updated, we need to 1379 * recalc the chandef width again, to get the 1380 * correct chanctx min_def 1381 */ 1382 ieee80211_recalc_chanctx_chantype(local, ctx); 1383 } 1384 } 1385 1386 } 1387 mutex_unlock(&local->chanctx_mtx); 1388 } 1389 1390 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata) 1391 { 1392 struct sta_info *sta; 1393 bool result = false; 1394 1395 rcu_read_lock(); 1396 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 1397 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 1398 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 1399 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) || 1400 !sta->sta.deflink.ht_cap.ht_supported) 1401 continue; 1402 result = true; 1403 break; 1404 } 1405 rcu_read_unlock(); 1406 1407 return result; 1408 } 1409 1410 static void 1411 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata, 1412 struct sta_info *sta) 1413 { 1414 bool tdls_ht; 1415 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | 1416 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | 1417 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; 1418 u16 opmode; 1419 1420 /* Nothing to do if the BSS connection uses HT */ 1421 if (!(sdata->deflink.u.mgd.conn_flags & IEEE80211_CONN_DISABLE_HT)) 1422 return; 1423 1424 tdls_ht = (sta && sta->sta.deflink.ht_cap.ht_supported) || 1425 iee80211_tdls_have_ht_peers(sdata); 1426 1427 opmode = sdata->vif.bss_conf.ht_operation_mode; 1428 1429 if (tdls_ht) 1430 opmode |= protection; 1431 else 1432 opmode &= ~protection; 1433 1434 if (opmode == sdata->vif.bss_conf.ht_operation_mode) 1435 return; 1436 1437 sdata->vif.bss_conf.ht_operation_mode = opmode; 1438 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1439 BSS_CHANGED_HT); 1440 } 1441 1442 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev, 1443 const u8 *peer, enum nl80211_tdls_operation oper) 1444 { 1445 struct sta_info *sta; 1446 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1447 struct ieee80211_local *local = sdata->local; 1448 int ret; 1449 1450 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1451 return -ENOTSUPP; 1452 1453 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1454 return -EINVAL; 1455 1456 switch (oper) { 1457 case NL80211_TDLS_ENABLE_LINK: 1458 case NL80211_TDLS_DISABLE_LINK: 1459 break; 1460 case NL80211_TDLS_TEARDOWN: 1461 case NL80211_TDLS_SETUP: 1462 case NL80211_TDLS_DISCOVERY_REQ: 1463 /* We don't support in-driver setup/teardown/discovery */ 1464 return -ENOTSUPP; 1465 } 1466 1467 /* protect possible bss_conf changes and avoid concurrency in 1468 * ieee80211_bss_info_change_notify() 1469 */ 1470 sdata_lock(sdata); 1471 mutex_lock(&local->mtx); 1472 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer); 1473 1474 switch (oper) { 1475 case NL80211_TDLS_ENABLE_LINK: 1476 if (sdata->vif.bss_conf.csa_active) { 1477 tdls_dbg(sdata, "TDLS: disallow link during CSA\n"); 1478 ret = -EBUSY; 1479 break; 1480 } 1481 1482 mutex_lock(&local->sta_mtx); 1483 sta = sta_info_get(sdata, peer); 1484 if (!sta) { 1485 mutex_unlock(&local->sta_mtx); 1486 ret = -ENOLINK; 1487 break; 1488 } 1489 1490 iee80211_tdls_recalc_chanctx(sdata, sta); 1491 iee80211_tdls_recalc_ht_protection(sdata, sta); 1492 1493 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1494 mutex_unlock(&local->sta_mtx); 1495 1496 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) || 1497 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)); 1498 ret = 0; 1499 break; 1500 case NL80211_TDLS_DISABLE_LINK: 1501 /* 1502 * The teardown message in ieee80211_tdls_mgmt_teardown() was 1503 * created while the queues were stopped, so it might still be 1504 * pending. Before flushing the queues we need to be sure the 1505 * message is handled by the tasklet handling pending messages, 1506 * otherwise we might start destroying the station before 1507 * sending the teardown packet. 1508 * Note that this only forces the tasklet to flush pendings - 1509 * not to stop the tasklet from rescheduling itself. 1510 */ 1511 tasklet_kill(&local->tx_pending_tasklet); 1512 /* flush a potentially queued teardown packet */ 1513 ieee80211_flush_queues(local, sdata, false); 1514 1515 ret = sta_info_destroy_addr(sdata, peer); 1516 1517 mutex_lock(&local->sta_mtx); 1518 iee80211_tdls_recalc_ht_protection(sdata, NULL); 1519 mutex_unlock(&local->sta_mtx); 1520 1521 iee80211_tdls_recalc_chanctx(sdata, NULL); 1522 break; 1523 default: 1524 ret = -ENOTSUPP; 1525 break; 1526 } 1527 1528 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1529 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work); 1530 eth_zero_addr(sdata->u.mgd.tdls_peer); 1531 } 1532 1533 if (ret == 0) 1534 wiphy_work_queue(sdata->local->hw.wiphy, 1535 &sdata->deflink.u.mgd.request_smps_work); 1536 1537 mutex_unlock(&local->mtx); 1538 sdata_unlock(sdata); 1539 return ret; 1540 } 1541 1542 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer, 1543 enum nl80211_tdls_operation oper, 1544 u16 reason_code, gfp_t gfp) 1545 { 1546 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1547 1548 if (vif->type != NL80211_IFTYPE_STATION || !vif->cfg.assoc) { 1549 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n", 1550 oper); 1551 return; 1552 } 1553 1554 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp); 1555 } 1556 EXPORT_SYMBOL(ieee80211_tdls_oper_request); 1557 1558 static void 1559 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout) 1560 { 1561 struct ieee80211_ch_switch_timing *ch_sw; 1562 1563 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING; 1564 *buf++ = sizeof(struct ieee80211_ch_switch_timing); 1565 1566 ch_sw = (void *)buf; 1567 ch_sw->switch_time = cpu_to_le16(switch_time); 1568 ch_sw->switch_timeout = cpu_to_le16(switch_timeout); 1569 } 1570 1571 /* find switch timing IE in SKB ready for Tx */ 1572 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb) 1573 { 1574 struct ieee80211_tdls_data *tf; 1575 const u8 *ie_start; 1576 1577 /* 1578 * Get the offset for the new location of the switch timing IE. 1579 * The SKB network header will now point to the "payload_type" 1580 * element of the TDLS data frame struct. 1581 */ 1582 tf = container_of(skb->data + skb_network_offset(skb), 1583 struct ieee80211_tdls_data, payload_type); 1584 ie_start = tf->u.chan_switch_req.variable; 1585 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start, 1586 skb->len - (ie_start - skb->data)); 1587 } 1588 1589 static struct sk_buff * 1590 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class, 1591 struct cfg80211_chan_def *chandef, 1592 u32 *ch_sw_tm_ie_offset) 1593 { 1594 struct ieee80211_sub_if_data *sdata = sta->sdata; 1595 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) + 1596 2 + sizeof(struct ieee80211_ch_switch_timing)]; 1597 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing); 1598 u8 *pos = extra_ies; 1599 struct sk_buff *skb; 1600 int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0; 1601 1602 /* 1603 * if chandef points to a wide channel add a Secondary-Channel 1604 * Offset information element 1605 */ 1606 if (chandef->width == NL80211_CHAN_WIDTH_40) { 1607 struct ieee80211_sec_chan_offs_ie *sec_chan_ie; 1608 bool ht40plus; 1609 1610 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; 1611 *pos++ = sizeof(*sec_chan_ie); 1612 sec_chan_ie = (void *)pos; 1613 1614 ht40plus = cfg80211_get_chandef_type(chandef) == 1615 NL80211_CHAN_HT40PLUS; 1616 sec_chan_ie->sec_chan_offs = ht40plus ? 1617 IEEE80211_HT_PARAM_CHA_SEC_ABOVE : 1618 IEEE80211_HT_PARAM_CHA_SEC_BELOW; 1619 pos += sizeof(*sec_chan_ie); 1620 1621 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie); 1622 } 1623 1624 /* just set the values to 0, this is a template */ 1625 iee80211_tdls_add_ch_switch_timing(pos, 0, 0); 1626 1627 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1628 link_id, 1629 WLAN_TDLS_CHANNEL_SWITCH_REQUEST, 1630 0, 0, !sta->sta.tdls_initiator, 1631 extra_ies, extra_ies_len, 1632 oper_class, chandef); 1633 if (!skb) 1634 return NULL; 1635 1636 skb = ieee80211_build_data_template(sdata, skb, 0); 1637 if (IS_ERR(skb)) { 1638 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n"); 1639 return NULL; 1640 } 1641 1642 if (ch_sw_tm_ie_offset) { 1643 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1644 1645 if (!tm_ie) { 1646 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n"); 1647 dev_kfree_skb_any(skb); 1648 return NULL; 1649 } 1650 1651 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1652 } 1653 1654 tdls_dbg(sdata, 1655 "TDLS channel switch request template for %pM ch %d width %d\n", 1656 sta->sta.addr, chandef->chan->center_freq, chandef->width); 1657 return skb; 1658 } 1659 1660 int 1661 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev, 1662 const u8 *addr, u8 oper_class, 1663 struct cfg80211_chan_def *chandef) 1664 { 1665 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1666 struct ieee80211_local *local = sdata->local; 1667 struct sta_info *sta; 1668 struct sk_buff *skb = NULL; 1669 u32 ch_sw_tm_ie; 1670 int ret; 1671 1672 if (chandef->chan->freq_offset) 1673 /* this may work, but is untested */ 1674 return -EOPNOTSUPP; 1675 1676 mutex_lock(&local->sta_mtx); 1677 sta = sta_info_get(sdata, addr); 1678 if (!sta) { 1679 tdls_dbg(sdata, 1680 "Invalid TDLS peer %pM for channel switch request\n", 1681 addr); 1682 ret = -ENOENT; 1683 goto out; 1684 } 1685 1686 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) { 1687 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n", 1688 addr); 1689 ret = -ENOTSUPP; 1690 goto out; 1691 } 1692 1693 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef, 1694 &ch_sw_tm_ie); 1695 if (!skb) { 1696 ret = -ENOENT; 1697 goto out; 1698 } 1699 1700 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class, 1701 chandef, skb, ch_sw_tm_ie); 1702 if (!ret) 1703 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1704 1705 out: 1706 mutex_unlock(&local->sta_mtx); 1707 dev_kfree_skb_any(skb); 1708 return ret; 1709 } 1710 1711 void 1712 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy, 1713 struct net_device *dev, 1714 const u8 *addr) 1715 { 1716 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1717 struct ieee80211_local *local = sdata->local; 1718 struct sta_info *sta; 1719 1720 mutex_lock(&local->sta_mtx); 1721 sta = sta_info_get(sdata, addr); 1722 if (!sta) { 1723 tdls_dbg(sdata, 1724 "Invalid TDLS peer %pM for channel switch cancel\n", 1725 addr); 1726 goto out; 1727 } 1728 1729 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) { 1730 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n", 1731 addr); 1732 goto out; 1733 } 1734 1735 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta); 1736 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1737 1738 out: 1739 mutex_unlock(&local->sta_mtx); 1740 } 1741 1742 static struct sk_buff * 1743 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta, 1744 u32 *ch_sw_tm_ie_offset) 1745 { 1746 struct ieee80211_sub_if_data *sdata = sta->sdata; 1747 struct sk_buff *skb; 1748 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)]; 1749 int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0; 1750 1751 /* initial timing are always zero in the template */ 1752 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0); 1753 1754 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1755 link_id, 1756 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE, 1757 0, 0, !sta->sta.tdls_initiator, 1758 extra_ies, sizeof(extra_ies), 0, NULL); 1759 if (!skb) 1760 return NULL; 1761 1762 skb = ieee80211_build_data_template(sdata, skb, 0); 1763 if (IS_ERR(skb)) { 1764 tdls_dbg(sdata, 1765 "Failed building TDLS channel switch resp frame\n"); 1766 return NULL; 1767 } 1768 1769 if (ch_sw_tm_ie_offset) { 1770 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1771 1772 if (!tm_ie) { 1773 tdls_dbg(sdata, 1774 "No switch timing IE in TDLS switch resp\n"); 1775 dev_kfree_skb_any(skb); 1776 return NULL; 1777 } 1778 1779 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1780 } 1781 1782 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n", 1783 sta->sta.addr); 1784 return skb; 1785 } 1786 1787 static int 1788 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata, 1789 struct sk_buff *skb) 1790 { 1791 struct ieee80211_local *local = sdata->local; 1792 struct ieee802_11_elems *elems = NULL; 1793 struct sta_info *sta; 1794 struct ieee80211_tdls_data *tf = (void *)skb->data; 1795 bool local_initiator; 1796 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1797 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable); 1798 struct ieee80211_tdls_ch_sw_params params = {}; 1799 int ret; 1800 1801 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 1802 params.timestamp = rx_status->device_timestamp; 1803 1804 if (skb->len < baselen) { 1805 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n", 1806 skb->len); 1807 return -EINVAL; 1808 } 1809 1810 mutex_lock(&local->sta_mtx); 1811 sta = sta_info_get(sdata, tf->sa); 1812 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1813 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1814 tf->sa); 1815 ret = -EINVAL; 1816 goto out; 1817 } 1818 1819 params.sta = &sta->sta; 1820 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code); 1821 if (params.status != 0) { 1822 ret = 0; 1823 goto call_drv; 1824 } 1825 1826 elems = ieee802_11_parse_elems(tf->u.chan_switch_resp.variable, 1827 skb->len - baselen, false, NULL); 1828 if (!elems) { 1829 ret = -ENOMEM; 1830 goto out; 1831 } 1832 1833 if (elems->parse_error) { 1834 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n"); 1835 ret = -EINVAL; 1836 goto out; 1837 } 1838 1839 if (!elems->ch_sw_timing || !elems->lnk_id) { 1840 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n"); 1841 ret = -EINVAL; 1842 goto out; 1843 } 1844 1845 /* validate the initiator is set correctly */ 1846 local_initiator = 1847 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1848 if (local_initiator == sta->sta.tdls_initiator) { 1849 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1850 ret = -EINVAL; 1851 goto out; 1852 } 1853 1854 params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time); 1855 params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout); 1856 1857 params.tmpl_skb = 1858 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie); 1859 if (!params.tmpl_skb) { 1860 ret = -ENOENT; 1861 goto out; 1862 } 1863 1864 ret = 0; 1865 call_drv: 1866 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1867 1868 tdls_dbg(sdata, 1869 "TDLS channel switch response received from %pM status %d\n", 1870 tf->sa, params.status); 1871 1872 out: 1873 mutex_unlock(&local->sta_mtx); 1874 dev_kfree_skb_any(params.tmpl_skb); 1875 kfree(elems); 1876 return ret; 1877 } 1878 1879 static int 1880 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata, 1881 struct sk_buff *skb) 1882 { 1883 struct ieee80211_local *local = sdata->local; 1884 struct ieee802_11_elems *elems; 1885 struct cfg80211_chan_def chandef; 1886 struct ieee80211_channel *chan; 1887 enum nl80211_channel_type chan_type; 1888 int freq; 1889 u8 target_channel, oper_class; 1890 bool local_initiator; 1891 struct sta_info *sta; 1892 enum nl80211_band band; 1893 struct ieee80211_tdls_data *tf = (void *)skb->data; 1894 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1895 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable); 1896 struct ieee80211_tdls_ch_sw_params params = {}; 1897 int ret = 0; 1898 1899 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 1900 params.timestamp = rx_status->device_timestamp; 1901 1902 if (skb->len < baselen) { 1903 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n", 1904 skb->len); 1905 return -EINVAL; 1906 } 1907 1908 target_channel = tf->u.chan_switch_req.target_channel; 1909 oper_class = tf->u.chan_switch_req.oper_class; 1910 1911 /* 1912 * We can't easily infer the channel band. The operating class is 1913 * ambiguous - there are multiple tables (US/Europe/JP/Global). The 1914 * solution here is to treat channels with number >14 as 5GHz ones, 1915 * and specifically check for the (oper_class, channel) combinations 1916 * where this doesn't hold. These are thankfully unique according to 1917 * IEEE802.11-2012. 1918 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as 1919 * valid here. 1920 */ 1921 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 || 1922 oper_class == 4 || oper_class == 5 || oper_class == 6) && 1923 target_channel < 14) 1924 band = NL80211_BAND_5GHZ; 1925 else 1926 band = target_channel < 14 ? NL80211_BAND_2GHZ : 1927 NL80211_BAND_5GHZ; 1928 1929 freq = ieee80211_channel_to_frequency(target_channel, band); 1930 if (freq == 0) { 1931 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n", 1932 target_channel); 1933 return -EINVAL; 1934 } 1935 1936 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq); 1937 if (!chan) { 1938 tdls_dbg(sdata, 1939 "Unsupported channel for TDLS chan switch: %d\n", 1940 target_channel); 1941 return -EINVAL; 1942 } 1943 1944 elems = ieee802_11_parse_elems(tf->u.chan_switch_req.variable, 1945 skb->len - baselen, false, NULL); 1946 if (!elems) 1947 return -ENOMEM; 1948 1949 if (elems->parse_error) { 1950 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n"); 1951 ret = -EINVAL; 1952 goto free; 1953 } 1954 1955 if (!elems->ch_sw_timing || !elems->lnk_id) { 1956 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n"); 1957 ret = -EINVAL; 1958 goto free; 1959 } 1960 1961 if (!elems->sec_chan_offs) { 1962 chan_type = NL80211_CHAN_HT20; 1963 } else { 1964 switch (elems->sec_chan_offs->sec_chan_offs) { 1965 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 1966 chan_type = NL80211_CHAN_HT40PLUS; 1967 break; 1968 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 1969 chan_type = NL80211_CHAN_HT40MINUS; 1970 break; 1971 default: 1972 chan_type = NL80211_CHAN_HT20; 1973 break; 1974 } 1975 } 1976 1977 cfg80211_chandef_create(&chandef, chan, chan_type); 1978 1979 /* we will be active on the TDLS link */ 1980 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef, 1981 sdata->wdev.iftype)) { 1982 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n"); 1983 ret = -EINVAL; 1984 goto free; 1985 } 1986 1987 mutex_lock(&local->sta_mtx); 1988 sta = sta_info_get(sdata, tf->sa); 1989 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1990 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1991 tf->sa); 1992 ret = -EINVAL; 1993 goto out; 1994 } 1995 1996 params.sta = &sta->sta; 1997 1998 /* validate the initiator is set correctly */ 1999 local_initiator = 2000 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 2001 if (local_initiator == sta->sta.tdls_initiator) { 2002 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 2003 ret = -EINVAL; 2004 goto out; 2005 } 2006 2007 /* peer should have known better */ 2008 if (!sta->sta.deflink.ht_cap.ht_supported && elems->sec_chan_offs && 2009 elems->sec_chan_offs->sec_chan_offs) { 2010 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n"); 2011 ret = -ENOTSUPP; 2012 goto out; 2013 } 2014 2015 params.chandef = &chandef; 2016 params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time); 2017 params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout); 2018 2019 params.tmpl_skb = 2020 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, 2021 ¶ms.ch_sw_tm_ie); 2022 if (!params.tmpl_skb) { 2023 ret = -ENOENT; 2024 goto out; 2025 } 2026 2027 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 2028 2029 tdls_dbg(sdata, 2030 "TDLS ch switch request received from %pM ch %d width %d\n", 2031 tf->sa, params.chandef->chan->center_freq, 2032 params.chandef->width); 2033 out: 2034 mutex_unlock(&local->sta_mtx); 2035 dev_kfree_skb_any(params.tmpl_skb); 2036 free: 2037 kfree(elems); 2038 return ret; 2039 } 2040 2041 void 2042 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata, 2043 struct sk_buff *skb) 2044 { 2045 struct ieee80211_tdls_data *tf = (void *)skb->data; 2046 struct wiphy *wiphy = sdata->local->hw.wiphy; 2047 2048 lockdep_assert_wiphy(wiphy); 2049 2050 /* make sure the driver supports it */ 2051 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH)) 2052 return; 2053 2054 /* we want to access the entire packet */ 2055 if (skb_linearize(skb)) 2056 return; 2057 /* 2058 * The packet/size was already validated by mac80211 Rx path, only look 2059 * at the action type. 2060 */ 2061 switch (tf->action_code) { 2062 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 2063 ieee80211_process_tdls_channel_switch_req(sdata, skb); 2064 break; 2065 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 2066 ieee80211_process_tdls_channel_switch_resp(sdata, skb); 2067 break; 2068 default: 2069 WARN_ON_ONCE(1); 2070 return; 2071 } 2072 } 2073 2074 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata) 2075 { 2076 struct sta_info *sta; 2077 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED; 2078 2079 rcu_read_lock(); 2080 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 2081 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 2082 !test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2083 continue; 2084 2085 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr, 2086 NL80211_TDLS_TEARDOWN, reason, 2087 GFP_ATOMIC); 2088 } 2089 rcu_read_unlock(); 2090 } 2091 2092 void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata, 2093 const u8 *peer, u16 reason) 2094 { 2095 struct ieee80211_sta *sta; 2096 2097 rcu_read_lock(); 2098 sta = ieee80211_find_sta(&sdata->vif, peer); 2099 if (!sta || !sta->tdls) { 2100 rcu_read_unlock(); 2101 return; 2102 } 2103 rcu_read_unlock(); 2104 2105 tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n", 2106 peer, reason, 2107 ieee80211_get_reason_code_string(reason)); 2108 2109 ieee80211_tdls_oper_request(&sdata->vif, peer, 2110 NL80211_TDLS_TEARDOWN, 2111 WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE, 2112 GFP_ATOMIC); 2113 } 2114