1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * mac80211 TDLS handling code 4 * 5 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net> 6 * Copyright 2014, Intel Corporation 7 * Copyright 2014 Intel Mobile Communications GmbH 8 * Copyright 2015 - 2016 Intel Deutschland GmbH 9 * Copyright (C) 2019, 2021-2022 Intel Corporation 10 */ 11 12 #include <linux/ieee80211.h> 13 #include <linux/log2.h> 14 #include <net/cfg80211.h> 15 #include <linux/rtnetlink.h> 16 #include "ieee80211_i.h" 17 #include "driver-ops.h" 18 #include "rate.h" 19 #include "wme.h" 20 21 /* give usermode some time for retries in setting up the TDLS session */ 22 #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ) 23 24 void ieee80211_tdls_peer_del_work(struct work_struct *wk) 25 { 26 struct ieee80211_sub_if_data *sdata; 27 struct ieee80211_local *local; 28 29 sdata = container_of(wk, struct ieee80211_sub_if_data, 30 u.mgd.tdls_peer_del_work.work); 31 local = sdata->local; 32 33 mutex_lock(&local->mtx); 34 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) { 35 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer); 36 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer); 37 eth_zero_addr(sdata->u.mgd.tdls_peer); 38 } 39 mutex_unlock(&local->mtx); 40 } 41 42 static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata, 43 struct sk_buff *skb) 44 { 45 struct ieee80211_local *local = sdata->local; 46 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 47 bool chan_switch = local->hw.wiphy->features & 48 NL80211_FEATURE_TDLS_CHANNEL_SWITCH; 49 bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) && 50 !ifmgd->tdls_wider_bw_prohibited; 51 bool buffer_sta = ieee80211_hw_check(&local->hw, 52 SUPPORTS_TDLS_BUFFER_STA); 53 struct ieee80211_supported_band *sband = ieee80211_get_sband(sdata); 54 bool vht = sband && sband->vht_cap.vht_supported; 55 u8 *pos = skb_put(skb, 10); 56 57 *pos++ = WLAN_EID_EXT_CAPABILITY; 58 *pos++ = 8; /* len */ 59 *pos++ = 0x0; 60 *pos++ = 0x0; 61 *pos++ = 0x0; 62 *pos++ = (chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0) | 63 (buffer_sta ? WLAN_EXT_CAPA4_TDLS_BUFFER_STA : 0); 64 *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED; 65 *pos++ = 0; 66 *pos++ = 0; 67 *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0; 68 } 69 70 static u8 71 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata, 72 struct sk_buff *skb, u16 start, u16 end, 73 u16 spacing) 74 { 75 u8 subband_cnt = 0, ch_cnt = 0; 76 struct ieee80211_channel *ch; 77 struct cfg80211_chan_def chandef; 78 int i, subband_start; 79 struct wiphy *wiphy = sdata->local->hw.wiphy; 80 81 for (i = start; i <= end; i += spacing) { 82 if (!ch_cnt) 83 subband_start = i; 84 85 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i); 86 if (ch) { 87 /* we will be active on the channel */ 88 cfg80211_chandef_create(&chandef, ch, 89 NL80211_CHAN_NO_HT); 90 if (cfg80211_reg_can_beacon_relax(wiphy, &chandef, 91 sdata->wdev.iftype)) { 92 ch_cnt++; 93 /* 94 * check if the next channel is also part of 95 * this allowed range 96 */ 97 continue; 98 } 99 } 100 101 /* 102 * we've reached the end of a range, with allowed channels 103 * found 104 */ 105 if (ch_cnt) { 106 u8 *pos = skb_put(skb, 2); 107 *pos++ = ieee80211_frequency_to_channel(subband_start); 108 *pos++ = ch_cnt; 109 110 subband_cnt++; 111 ch_cnt = 0; 112 } 113 } 114 115 /* all channels in the requested range are allowed - add them here */ 116 if (ch_cnt) { 117 u8 *pos = skb_put(skb, 2); 118 *pos++ = ieee80211_frequency_to_channel(subband_start); 119 *pos++ = ch_cnt; 120 121 subband_cnt++; 122 } 123 124 return subband_cnt; 125 } 126 127 static void 128 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata, 129 struct sk_buff *skb) 130 { 131 /* 132 * Add possible channels for TDLS. These are channels that are allowed 133 * to be active. 134 */ 135 u8 subband_cnt; 136 u8 *pos = skb_put(skb, 2); 137 138 *pos++ = WLAN_EID_SUPPORTED_CHANNELS; 139 140 /* 141 * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as 142 * this doesn't happen in real world scenarios. 143 */ 144 145 /* 2GHz, with 5MHz spacing */ 146 subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5); 147 148 /* 5GHz, with 20MHz spacing */ 149 subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20); 150 151 /* length */ 152 *pos = 2 * subband_cnt; 153 } 154 155 static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata, 156 struct sk_buff *skb) 157 { 158 u8 *pos; 159 u8 op_class; 160 161 if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef, 162 &op_class)) 163 return; 164 165 pos = skb_put(skb, 4); 166 *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES; 167 *pos++ = 2; /* len */ 168 169 *pos++ = op_class; 170 *pos++ = op_class; /* give current operating class as alternate too */ 171 } 172 173 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb) 174 { 175 u8 *pos = skb_put(skb, 3); 176 177 *pos++ = WLAN_EID_BSS_COEX_2040; 178 *pos++ = 1; /* len */ 179 180 *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST; 181 } 182 183 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata, 184 u16 status_code) 185 { 186 struct ieee80211_supported_band *sband; 187 188 /* The capability will be 0 when sending a failure code */ 189 if (status_code != 0) 190 return 0; 191 192 sband = ieee80211_get_sband(sdata); 193 if (sband && sband->band == NL80211_BAND_2GHZ) { 194 return WLAN_CAPABILITY_SHORT_SLOT_TIME | 195 WLAN_CAPABILITY_SHORT_PREAMBLE; 196 } 197 198 return 0; 199 } 200 201 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata, 202 struct sk_buff *skb, const u8 *peer, 203 bool initiator) 204 { 205 struct ieee80211_tdls_lnkie *lnkid; 206 const u8 *init_addr, *rsp_addr; 207 208 if (initiator) { 209 init_addr = sdata->vif.addr; 210 rsp_addr = peer; 211 } else { 212 init_addr = peer; 213 rsp_addr = sdata->vif.addr; 214 } 215 216 lnkid = skb_put(skb, sizeof(struct ieee80211_tdls_lnkie)); 217 218 lnkid->ie_type = WLAN_EID_LINK_ID; 219 lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2; 220 221 memcpy(lnkid->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 222 memcpy(lnkid->init_sta, init_addr, ETH_ALEN); 223 memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN); 224 } 225 226 static void 227 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 228 { 229 u8 *pos = skb_put(skb, 4); 230 231 *pos++ = WLAN_EID_AID; 232 *pos++ = 2; /* len */ 233 put_unaligned_le16(sdata->vif.cfg.aid, pos); 234 } 235 236 /* translate numbering in the WMM parameter IE to the mac80211 notation */ 237 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac) 238 { 239 switch (ac) { 240 default: 241 WARN_ON_ONCE(1); 242 fallthrough; 243 case 0: 244 return IEEE80211_AC_BE; 245 case 1: 246 return IEEE80211_AC_BK; 247 case 2: 248 return IEEE80211_AC_VI; 249 case 3: 250 return IEEE80211_AC_VO; 251 } 252 } 253 254 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci) 255 { 256 u8 ret; 257 258 ret = aifsn & 0x0f; 259 if (acm) 260 ret |= 0x10; 261 ret |= (aci << 5) & 0x60; 262 return ret; 263 } 264 265 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max) 266 { 267 return ((ilog2(cw_min + 1) << 0x0) & 0x0f) | 268 ((ilog2(cw_max + 1) << 0x4) & 0xf0); 269 } 270 271 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata, 272 struct sk_buff *skb) 273 { 274 struct ieee80211_wmm_param_ie *wmm; 275 struct ieee80211_tx_queue_params *txq; 276 int i; 277 278 wmm = skb_put_zero(skb, sizeof(*wmm)); 279 280 wmm->element_id = WLAN_EID_VENDOR_SPECIFIC; 281 wmm->len = sizeof(*wmm) - 2; 282 283 wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */ 284 wmm->oui[1] = 0x50; 285 wmm->oui[2] = 0xf2; 286 wmm->oui_type = 2; /* WME */ 287 wmm->oui_subtype = 1; /* WME param */ 288 wmm->version = 1; /* WME ver */ 289 wmm->qos_info = 0; /* U-APSD not in use */ 290 291 /* 292 * Use the EDCA parameters defined for the BSS, or default if the AP 293 * doesn't support it, as mandated by 802.11-2012 section 10.22.4 294 */ 295 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 296 txq = &sdata->deflink.tx_conf[ieee80211_ac_from_wmm(i)]; 297 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs, 298 txq->acm, i); 299 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max); 300 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop); 301 } 302 } 303 304 static void 305 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata, 306 struct sta_info *sta) 307 { 308 /* IEEE802.11ac-2013 Table E-4 */ 309 u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 }; 310 struct cfg80211_chan_def uc = sta->tdls_chandef; 311 enum nl80211_chan_width max_width = 312 ieee80211_sta_cap_chan_bw(&sta->deflink); 313 int i; 314 315 /* only support upgrading non-narrow channels up to 80Mhz */ 316 if (max_width == NL80211_CHAN_WIDTH_5 || 317 max_width == NL80211_CHAN_WIDTH_10) 318 return; 319 320 if (max_width > NL80211_CHAN_WIDTH_80) 321 max_width = NL80211_CHAN_WIDTH_80; 322 323 if (uc.width >= max_width) 324 return; 325 /* 326 * Channel usage constrains in the IEEE802.11ac-2013 specification only 327 * allow expanding a 20MHz channel to 80MHz in a single way. In 328 * addition, there are no 40MHz allowed channels that are not part of 329 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here). 330 */ 331 for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++) 332 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) { 333 uc.center_freq1 = centers_80mhz[i]; 334 uc.center_freq2 = 0; 335 uc.width = NL80211_CHAN_WIDTH_80; 336 break; 337 } 338 339 if (!uc.center_freq1) 340 return; 341 342 /* proceed to downgrade the chandef until usable or the same as AP BW */ 343 while (uc.width > max_width || 344 (uc.width > sta->tdls_chandef.width && 345 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc, 346 sdata->wdev.iftype))) 347 ieee80211_chandef_downgrade(&uc); 348 349 if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) { 350 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n", 351 sta->tdls_chandef.width, uc.width); 352 353 /* 354 * the station is not yet authorized when BW upgrade is done, 355 * locking is not required 356 */ 357 sta->tdls_chandef = uc; 358 } 359 } 360 361 static void 362 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata, 363 struct sk_buff *skb, const u8 *peer, 364 u8 action_code, bool initiator, 365 const u8 *extra_ies, size_t extra_ies_len) 366 { 367 struct ieee80211_supported_band *sband; 368 struct ieee80211_local *local = sdata->local; 369 struct ieee80211_sta_ht_cap ht_cap; 370 struct ieee80211_sta_vht_cap vht_cap; 371 struct sta_info *sta = NULL; 372 size_t offset = 0, noffset; 373 u8 *pos; 374 375 sband = ieee80211_get_sband(sdata); 376 if (!sband) 377 return; 378 379 ieee80211_add_srates_ie(sdata, skb, false, sband->band); 380 ieee80211_add_ext_srates_ie(sdata, skb, false, sband->band); 381 ieee80211_tdls_add_supp_channels(sdata, skb); 382 383 /* add any custom IEs that go before Extended Capabilities */ 384 if (extra_ies_len) { 385 static const u8 before_ext_cap[] = { 386 WLAN_EID_SUPP_RATES, 387 WLAN_EID_COUNTRY, 388 WLAN_EID_EXT_SUPP_RATES, 389 WLAN_EID_SUPPORTED_CHANNELS, 390 WLAN_EID_RSN, 391 }; 392 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 393 before_ext_cap, 394 ARRAY_SIZE(before_ext_cap), 395 offset); 396 skb_put_data(skb, extra_ies + offset, noffset - offset); 397 offset = noffset; 398 } 399 400 ieee80211_tdls_add_ext_capab(sdata, skb); 401 402 /* add the QoS element if we support it */ 403 if (local->hw.queues >= IEEE80211_NUM_ACS && 404 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES) 405 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */ 406 407 /* add any custom IEs that go before HT capabilities */ 408 if (extra_ies_len) { 409 static const u8 before_ht_cap[] = { 410 WLAN_EID_SUPP_RATES, 411 WLAN_EID_COUNTRY, 412 WLAN_EID_EXT_SUPP_RATES, 413 WLAN_EID_SUPPORTED_CHANNELS, 414 WLAN_EID_RSN, 415 WLAN_EID_EXT_CAPABILITY, 416 WLAN_EID_QOS_CAPA, 417 WLAN_EID_FAST_BSS_TRANSITION, 418 WLAN_EID_TIMEOUT_INTERVAL, 419 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 420 }; 421 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 422 before_ht_cap, 423 ARRAY_SIZE(before_ht_cap), 424 offset); 425 skb_put_data(skb, extra_ies + offset, noffset - offset); 426 offset = noffset; 427 } 428 429 mutex_lock(&local->sta_mtx); 430 431 /* we should have the peer STA if we're already responding */ 432 if (action_code == WLAN_TDLS_SETUP_RESPONSE) { 433 sta = sta_info_get(sdata, peer); 434 if (WARN_ON_ONCE(!sta)) { 435 mutex_unlock(&local->sta_mtx); 436 return; 437 } 438 439 sta->tdls_chandef = sdata->vif.bss_conf.chandef; 440 } 441 442 ieee80211_tdls_add_oper_classes(sdata, skb); 443 444 /* 445 * with TDLS we can switch channels, and HT-caps are not necessarily 446 * the same on all bands. The specification limits the setup to a 447 * single HT-cap, so use the current band for now. 448 */ 449 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 450 451 if ((action_code == WLAN_TDLS_SETUP_REQUEST || 452 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && 453 ht_cap.ht_supported) { 454 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 455 456 /* disable SMPS in TDLS initiator */ 457 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED 458 << IEEE80211_HT_CAP_SM_PS_SHIFT; 459 460 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 461 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 462 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && 463 ht_cap.ht_supported && sta->sta.deflink.ht_cap.ht_supported) { 464 /* the peer caps are already intersected with our own */ 465 memcpy(&ht_cap, &sta->sta.deflink.ht_cap, sizeof(ht_cap)); 466 467 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 468 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 469 } 470 471 if (ht_cap.ht_supported && 472 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 473 ieee80211_tdls_add_bss_coex_ie(skb); 474 475 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 476 477 /* add any custom IEs that go before VHT capabilities */ 478 if (extra_ies_len) { 479 static const u8 before_vht_cap[] = { 480 WLAN_EID_SUPP_RATES, 481 WLAN_EID_COUNTRY, 482 WLAN_EID_EXT_SUPP_RATES, 483 WLAN_EID_SUPPORTED_CHANNELS, 484 WLAN_EID_RSN, 485 WLAN_EID_EXT_CAPABILITY, 486 WLAN_EID_QOS_CAPA, 487 WLAN_EID_FAST_BSS_TRANSITION, 488 WLAN_EID_TIMEOUT_INTERVAL, 489 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 490 WLAN_EID_MULTI_BAND, 491 }; 492 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 493 before_vht_cap, 494 ARRAY_SIZE(before_vht_cap), 495 offset); 496 skb_put_data(skb, extra_ies + offset, noffset - offset); 497 offset = noffset; 498 } 499 500 /* build the VHT-cap similarly to the HT-cap */ 501 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap)); 502 if ((action_code == WLAN_TDLS_SETUP_REQUEST || 503 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && 504 vht_cap.vht_supported) { 505 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap); 506 507 /* the AID is present only when VHT is implemented */ 508 if (action_code == WLAN_TDLS_SETUP_REQUEST) 509 ieee80211_tdls_add_aid(sdata, skb); 510 511 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 512 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap); 513 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && 514 vht_cap.vht_supported && sta->sta.deflink.vht_cap.vht_supported) { 515 /* the peer caps are already intersected with our own */ 516 memcpy(&vht_cap, &sta->sta.deflink.vht_cap, sizeof(vht_cap)); 517 518 /* the AID is present only when VHT is implemented */ 519 ieee80211_tdls_add_aid(sdata, skb); 520 521 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 522 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap); 523 524 /* 525 * if both peers support WIDER_BW, we can expand the chandef to 526 * a wider compatible one, up to 80MHz 527 */ 528 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) 529 ieee80211_tdls_chandef_vht_upgrade(sdata, sta); 530 } 531 532 mutex_unlock(&local->sta_mtx); 533 534 /* add any remaining IEs */ 535 if (extra_ies_len) { 536 noffset = extra_ies_len; 537 skb_put_data(skb, extra_ies + offset, noffset - offset); 538 } 539 540 } 541 542 static void 543 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata, 544 struct sk_buff *skb, const u8 *peer, 545 bool initiator, const u8 *extra_ies, 546 size_t extra_ies_len) 547 { 548 struct ieee80211_local *local = sdata->local; 549 size_t offset = 0, noffset; 550 struct sta_info *sta, *ap_sta; 551 struct ieee80211_supported_band *sband; 552 u8 *pos; 553 554 sband = ieee80211_get_sband(sdata); 555 if (!sband) 556 return; 557 558 mutex_lock(&local->sta_mtx); 559 560 sta = sta_info_get(sdata, peer); 561 ap_sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid); 562 if (WARN_ON_ONCE(!sta || !ap_sta)) { 563 mutex_unlock(&local->sta_mtx); 564 return; 565 } 566 567 sta->tdls_chandef = sdata->vif.bss_conf.chandef; 568 569 /* add any custom IEs that go before the QoS IE */ 570 if (extra_ies_len) { 571 static const u8 before_qos[] = { 572 WLAN_EID_RSN, 573 }; 574 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 575 before_qos, 576 ARRAY_SIZE(before_qos), 577 offset); 578 skb_put_data(skb, extra_ies + offset, noffset - offset); 579 offset = noffset; 580 } 581 582 /* add the QoS param IE if both the peer and we support it */ 583 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme) 584 ieee80211_tdls_add_wmm_param_ie(sdata, skb); 585 586 /* add any custom IEs that go before HT operation */ 587 if (extra_ies_len) { 588 static const u8 before_ht_op[] = { 589 WLAN_EID_RSN, 590 WLAN_EID_QOS_CAPA, 591 WLAN_EID_FAST_BSS_TRANSITION, 592 WLAN_EID_TIMEOUT_INTERVAL, 593 }; 594 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 595 before_ht_op, 596 ARRAY_SIZE(before_ht_op), 597 offset); 598 skb_put_data(skb, extra_ies + offset, noffset - offset); 599 offset = noffset; 600 } 601 602 /* 603 * if HT support is only added in TDLS, we need an HT-operation IE. 604 * add the IE as required by IEEE802.11-2012 9.23.3.2. 605 */ 606 if (!ap_sta->sta.deflink.ht_cap.ht_supported && sta->sta.deflink.ht_cap.ht_supported) { 607 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | 608 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | 609 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; 610 611 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation)); 612 ieee80211_ie_build_ht_oper(pos, &sta->sta.deflink.ht_cap, 613 &sdata->vif.bss_conf.chandef, prot, 614 true); 615 } 616 617 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 618 619 /* only include VHT-operation if not on the 2.4GHz band */ 620 if (sband->band != NL80211_BAND_2GHZ && 621 sta->sta.deflink.vht_cap.vht_supported) { 622 /* 623 * if both peers support WIDER_BW, we can expand the chandef to 624 * a wider compatible one, up to 80MHz 625 */ 626 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) 627 ieee80211_tdls_chandef_vht_upgrade(sdata, sta); 628 629 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation)); 630 ieee80211_ie_build_vht_oper(pos, &sta->sta.deflink.vht_cap, 631 &sta->tdls_chandef); 632 } 633 634 mutex_unlock(&local->sta_mtx); 635 636 /* add any remaining IEs */ 637 if (extra_ies_len) { 638 noffset = extra_ies_len; 639 skb_put_data(skb, extra_ies + offset, noffset - offset); 640 } 641 } 642 643 static void 644 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata, 645 struct sk_buff *skb, const u8 *peer, 646 bool initiator, const u8 *extra_ies, 647 size_t extra_ies_len, u8 oper_class, 648 struct cfg80211_chan_def *chandef) 649 { 650 struct ieee80211_tdls_data *tf; 651 size_t offset = 0, noffset; 652 653 if (WARN_ON_ONCE(!chandef)) 654 return; 655 656 tf = (void *)skb->data; 657 tf->u.chan_switch_req.target_channel = 658 ieee80211_frequency_to_channel(chandef->chan->center_freq); 659 tf->u.chan_switch_req.oper_class = oper_class; 660 661 if (extra_ies_len) { 662 static const u8 before_lnkie[] = { 663 WLAN_EID_SECONDARY_CHANNEL_OFFSET, 664 }; 665 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 666 before_lnkie, 667 ARRAY_SIZE(before_lnkie), 668 offset); 669 skb_put_data(skb, extra_ies + offset, noffset - offset); 670 offset = noffset; 671 } 672 673 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 674 675 /* add any remaining IEs */ 676 if (extra_ies_len) { 677 noffset = extra_ies_len; 678 skb_put_data(skb, extra_ies + offset, noffset - offset); 679 } 680 } 681 682 static void 683 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata, 684 struct sk_buff *skb, const u8 *peer, 685 u16 status_code, bool initiator, 686 const u8 *extra_ies, 687 size_t extra_ies_len) 688 { 689 if (status_code == 0) 690 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 691 692 if (extra_ies_len) 693 skb_put_data(skb, extra_ies, extra_ies_len); 694 } 695 696 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata, 697 struct sk_buff *skb, const u8 *peer, 698 u8 action_code, u16 status_code, 699 bool initiator, const u8 *extra_ies, 700 size_t extra_ies_len, u8 oper_class, 701 struct cfg80211_chan_def *chandef) 702 { 703 switch (action_code) { 704 case WLAN_TDLS_SETUP_REQUEST: 705 case WLAN_TDLS_SETUP_RESPONSE: 706 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 707 if (status_code == 0) 708 ieee80211_tdls_add_setup_start_ies(sdata, skb, peer, 709 action_code, 710 initiator, 711 extra_ies, 712 extra_ies_len); 713 break; 714 case WLAN_TDLS_SETUP_CONFIRM: 715 if (status_code == 0) 716 ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer, 717 initiator, extra_ies, 718 extra_ies_len); 719 break; 720 case WLAN_TDLS_TEARDOWN: 721 case WLAN_TDLS_DISCOVERY_REQUEST: 722 if (extra_ies_len) 723 skb_put_data(skb, extra_ies, extra_ies_len); 724 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN) 725 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 726 break; 727 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 728 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer, 729 initiator, extra_ies, 730 extra_ies_len, 731 oper_class, chandef); 732 break; 733 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 734 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer, 735 status_code, 736 initiator, extra_ies, 737 extra_ies_len); 738 break; 739 } 740 741 } 742 743 static int 744 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev, 745 const u8 *peer, u8 action_code, u8 dialog_token, 746 u16 status_code, struct sk_buff *skb) 747 { 748 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 749 struct ieee80211_tdls_data *tf; 750 751 tf = skb_put(skb, offsetof(struct ieee80211_tdls_data, u)); 752 753 memcpy(tf->da, peer, ETH_ALEN); 754 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN); 755 tf->ether_type = cpu_to_be16(ETH_P_TDLS); 756 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE; 757 758 /* network header is after the ethernet header */ 759 skb_set_network_header(skb, ETH_HLEN); 760 761 switch (action_code) { 762 case WLAN_TDLS_SETUP_REQUEST: 763 tf->category = WLAN_CATEGORY_TDLS; 764 tf->action_code = WLAN_TDLS_SETUP_REQUEST; 765 766 skb_put(skb, sizeof(tf->u.setup_req)); 767 tf->u.setup_req.dialog_token = dialog_token; 768 tf->u.setup_req.capability = 769 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, 770 status_code)); 771 break; 772 case WLAN_TDLS_SETUP_RESPONSE: 773 tf->category = WLAN_CATEGORY_TDLS; 774 tf->action_code = WLAN_TDLS_SETUP_RESPONSE; 775 776 skb_put(skb, sizeof(tf->u.setup_resp)); 777 tf->u.setup_resp.status_code = cpu_to_le16(status_code); 778 tf->u.setup_resp.dialog_token = dialog_token; 779 tf->u.setup_resp.capability = 780 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, 781 status_code)); 782 break; 783 case WLAN_TDLS_SETUP_CONFIRM: 784 tf->category = WLAN_CATEGORY_TDLS; 785 tf->action_code = WLAN_TDLS_SETUP_CONFIRM; 786 787 skb_put(skb, sizeof(tf->u.setup_cfm)); 788 tf->u.setup_cfm.status_code = cpu_to_le16(status_code); 789 tf->u.setup_cfm.dialog_token = dialog_token; 790 break; 791 case WLAN_TDLS_TEARDOWN: 792 tf->category = WLAN_CATEGORY_TDLS; 793 tf->action_code = WLAN_TDLS_TEARDOWN; 794 795 skb_put(skb, sizeof(tf->u.teardown)); 796 tf->u.teardown.reason_code = cpu_to_le16(status_code); 797 break; 798 case WLAN_TDLS_DISCOVERY_REQUEST: 799 tf->category = WLAN_CATEGORY_TDLS; 800 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST; 801 802 skb_put(skb, sizeof(tf->u.discover_req)); 803 tf->u.discover_req.dialog_token = dialog_token; 804 break; 805 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 806 tf->category = WLAN_CATEGORY_TDLS; 807 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 808 809 skb_put(skb, sizeof(tf->u.chan_switch_req)); 810 break; 811 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 812 tf->category = WLAN_CATEGORY_TDLS; 813 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 814 815 skb_put(skb, sizeof(tf->u.chan_switch_resp)); 816 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code); 817 break; 818 default: 819 return -EINVAL; 820 } 821 822 return 0; 823 } 824 825 static int 826 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev, 827 const u8 *peer, u8 action_code, u8 dialog_token, 828 u16 status_code, struct sk_buff *skb) 829 { 830 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 831 struct ieee80211_mgmt *mgmt; 832 833 mgmt = skb_put_zero(skb, 24); 834 memcpy(mgmt->da, peer, ETH_ALEN); 835 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 836 memcpy(mgmt->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 837 838 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 839 IEEE80211_STYPE_ACTION); 840 841 switch (action_code) { 842 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 843 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp)); 844 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC; 845 mgmt->u.action.u.tdls_discover_resp.action_code = 846 WLAN_PUB_ACTION_TDLS_DISCOVER_RES; 847 mgmt->u.action.u.tdls_discover_resp.dialog_token = 848 dialog_token; 849 mgmt->u.action.u.tdls_discover_resp.capability = 850 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, 851 status_code)); 852 break; 853 default: 854 return -EINVAL; 855 } 856 857 return 0; 858 } 859 860 static struct sk_buff * 861 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata, 862 const u8 *peer, u8 action_code, 863 u8 dialog_token, u16 status_code, 864 bool initiator, const u8 *extra_ies, 865 size_t extra_ies_len, u8 oper_class, 866 struct cfg80211_chan_def *chandef) 867 { 868 struct ieee80211_local *local = sdata->local; 869 struct sk_buff *skb; 870 int ret; 871 872 skb = netdev_alloc_skb(sdata->dev, 873 local->hw.extra_tx_headroom + 874 max(sizeof(struct ieee80211_mgmt), 875 sizeof(struct ieee80211_tdls_data)) + 876 50 + /* supported rates */ 877 10 + /* ext capab */ 878 26 + /* max(WMM-info, WMM-param) */ 879 2 + max(sizeof(struct ieee80211_ht_cap), 880 sizeof(struct ieee80211_ht_operation)) + 881 2 + max(sizeof(struct ieee80211_vht_cap), 882 sizeof(struct ieee80211_vht_operation)) + 883 50 + /* supported channels */ 884 3 + /* 40/20 BSS coex */ 885 4 + /* AID */ 886 4 + /* oper classes */ 887 extra_ies_len + 888 sizeof(struct ieee80211_tdls_lnkie)); 889 if (!skb) 890 return NULL; 891 892 skb_reserve(skb, local->hw.extra_tx_headroom); 893 894 switch (action_code) { 895 case WLAN_TDLS_SETUP_REQUEST: 896 case WLAN_TDLS_SETUP_RESPONSE: 897 case WLAN_TDLS_SETUP_CONFIRM: 898 case WLAN_TDLS_TEARDOWN: 899 case WLAN_TDLS_DISCOVERY_REQUEST: 900 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 901 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 902 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy, 903 sdata->dev, peer, 904 action_code, dialog_token, 905 status_code, skb); 906 break; 907 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 908 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev, 909 peer, action_code, 910 dialog_token, status_code, 911 skb); 912 break; 913 default: 914 ret = -ENOTSUPP; 915 break; 916 } 917 918 if (ret < 0) 919 goto fail; 920 921 ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code, 922 initiator, extra_ies, extra_ies_len, oper_class, 923 chandef); 924 return skb; 925 926 fail: 927 dev_kfree_skb(skb); 928 return NULL; 929 } 930 931 static int 932 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev, 933 const u8 *peer, u8 action_code, u8 dialog_token, 934 u16 status_code, u32 peer_capability, 935 bool initiator, const u8 *extra_ies, 936 size_t extra_ies_len, u8 oper_class, 937 struct cfg80211_chan_def *chandef) 938 { 939 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 940 struct sk_buff *skb = NULL; 941 struct sta_info *sta; 942 u32 flags = 0; 943 int ret = 0; 944 945 rcu_read_lock(); 946 sta = sta_info_get(sdata, peer); 947 948 /* infer the initiator if we can, to support old userspace */ 949 switch (action_code) { 950 case WLAN_TDLS_SETUP_REQUEST: 951 if (sta) { 952 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); 953 sta->sta.tdls_initiator = false; 954 } 955 fallthrough; 956 case WLAN_TDLS_SETUP_CONFIRM: 957 case WLAN_TDLS_DISCOVERY_REQUEST: 958 initiator = true; 959 break; 960 case WLAN_TDLS_SETUP_RESPONSE: 961 /* 962 * In some testing scenarios, we send a request and response. 963 * Make the last packet sent take effect for the initiator 964 * value. 965 */ 966 if (sta) { 967 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); 968 sta->sta.tdls_initiator = true; 969 } 970 fallthrough; 971 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 972 initiator = false; 973 break; 974 case WLAN_TDLS_TEARDOWN: 975 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 976 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 977 /* any value is ok */ 978 break; 979 default: 980 ret = -ENOTSUPP; 981 break; 982 } 983 984 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR)) 985 initiator = true; 986 987 rcu_read_unlock(); 988 if (ret < 0) 989 goto fail; 990 991 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code, 992 dialog_token, status_code, 993 initiator, extra_ies, 994 extra_ies_len, oper_class, 995 chandef); 996 if (!skb) { 997 ret = -EINVAL; 998 goto fail; 999 } 1000 1001 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) { 1002 ieee80211_tx_skb(sdata, skb); 1003 return 0; 1004 } 1005 1006 /* 1007 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise 1008 * we should default to AC_VI. 1009 */ 1010 switch (action_code) { 1011 case WLAN_TDLS_SETUP_REQUEST: 1012 case WLAN_TDLS_SETUP_RESPONSE: 1013 skb->priority = 256 + 2; 1014 break; 1015 default: 1016 skb->priority = 256 + 5; 1017 break; 1018 } 1019 1020 /* 1021 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress. 1022 * Later, if no ACK is returned from peer, we will re-send the teardown 1023 * packet through the AP. 1024 */ 1025 if ((action_code == WLAN_TDLS_TEARDOWN) && 1026 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) { 1027 bool try_resend; /* Should we keep skb for possible resend */ 1028 1029 /* If not sending directly to peer - no point in keeping skb */ 1030 rcu_read_lock(); 1031 sta = sta_info_get(sdata, peer); 1032 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1033 rcu_read_unlock(); 1034 1035 spin_lock_bh(&sdata->u.mgd.teardown_lock); 1036 if (try_resend && !sdata->u.mgd.teardown_skb) { 1037 /* Mark it as requiring TX status callback */ 1038 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | 1039 IEEE80211_TX_INTFL_MLME_CONN_TX; 1040 1041 /* 1042 * skb is copied since mac80211 will later set 1043 * properties that might not be the same as the AP, 1044 * such as encryption, QoS, addresses, etc. 1045 * 1046 * No problem if skb_copy() fails, so no need to check. 1047 */ 1048 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC); 1049 sdata->u.mgd.orig_teardown_skb = skb; 1050 } 1051 spin_unlock_bh(&sdata->u.mgd.teardown_lock); 1052 } 1053 1054 /* disable bottom halves when entering the Tx path */ 1055 local_bh_disable(); 1056 __ieee80211_subif_start_xmit(skb, dev, flags, 1057 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 1058 local_bh_enable(); 1059 1060 return ret; 1061 1062 fail: 1063 dev_kfree_skb(skb); 1064 return ret; 1065 } 1066 1067 static int 1068 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev, 1069 const u8 *peer, u8 action_code, u8 dialog_token, 1070 u16 status_code, u32 peer_capability, bool initiator, 1071 const u8 *extra_ies, size_t extra_ies_len) 1072 { 1073 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1074 struct ieee80211_local *local = sdata->local; 1075 enum ieee80211_smps_mode smps_mode = 1076 sdata->deflink.u.mgd.driver_smps_mode; 1077 int ret; 1078 1079 /* don't support setup with forced SMPS mode that's not off */ 1080 if (smps_mode != IEEE80211_SMPS_AUTOMATIC && 1081 smps_mode != IEEE80211_SMPS_OFF) { 1082 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n", 1083 smps_mode); 1084 return -ENOTSUPP; 1085 } 1086 1087 mutex_lock(&local->mtx); 1088 1089 /* we don't support concurrent TDLS peer setups */ 1090 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) && 1091 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1092 ret = -EBUSY; 1093 goto out_unlock; 1094 } 1095 1096 /* 1097 * make sure we have a STA representing the peer so we drop or buffer 1098 * non-TDLS-setup frames to the peer. We can't send other packets 1099 * during setup through the AP path. 1100 * Allow error packets to be sent - sometimes we don't even add a STA 1101 * before failing the setup. 1102 */ 1103 if (status_code == 0) { 1104 rcu_read_lock(); 1105 if (!sta_info_get(sdata, peer)) { 1106 rcu_read_unlock(); 1107 ret = -ENOLINK; 1108 goto out_unlock; 1109 } 1110 rcu_read_unlock(); 1111 } 1112 1113 ieee80211_flush_queues(local, sdata, false); 1114 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN); 1115 mutex_unlock(&local->mtx); 1116 1117 /* we cannot take the mutex while preparing the setup packet */ 1118 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code, 1119 dialog_token, status_code, 1120 peer_capability, initiator, 1121 extra_ies, extra_ies_len, 0, 1122 NULL); 1123 if (ret < 0) { 1124 mutex_lock(&local->mtx); 1125 eth_zero_addr(sdata->u.mgd.tdls_peer); 1126 mutex_unlock(&local->mtx); 1127 return ret; 1128 } 1129 1130 ieee80211_queue_delayed_work(&sdata->local->hw, 1131 &sdata->u.mgd.tdls_peer_del_work, 1132 TDLS_PEER_SETUP_TIMEOUT); 1133 return 0; 1134 1135 out_unlock: 1136 mutex_unlock(&local->mtx); 1137 return ret; 1138 } 1139 1140 static int 1141 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev, 1142 const u8 *peer, u8 action_code, u8 dialog_token, 1143 u16 status_code, u32 peer_capability, 1144 bool initiator, const u8 *extra_ies, 1145 size_t extra_ies_len) 1146 { 1147 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1148 struct ieee80211_local *local = sdata->local; 1149 struct sta_info *sta; 1150 int ret; 1151 1152 /* 1153 * No packets can be transmitted to the peer via the AP during setup - 1154 * the STA is set as a TDLS peer, but is not authorized. 1155 * During teardown, we prevent direct transmissions by stopping the 1156 * queues and flushing all direct packets. 1157 */ 1158 ieee80211_stop_vif_queues(local, sdata, 1159 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1160 ieee80211_flush_queues(local, sdata, false); 1161 1162 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code, 1163 dialog_token, status_code, 1164 peer_capability, initiator, 1165 extra_ies, extra_ies_len, 0, 1166 NULL); 1167 if (ret < 0) 1168 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n", 1169 ret); 1170 1171 /* 1172 * Remove the STA AUTH flag to force further traffic through the AP. If 1173 * the STA was unreachable, it was already removed. 1174 */ 1175 rcu_read_lock(); 1176 sta = sta_info_get(sdata, peer); 1177 if (sta) 1178 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1179 rcu_read_unlock(); 1180 1181 ieee80211_wake_vif_queues(local, sdata, 1182 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1183 1184 return 0; 1185 } 1186 1187 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev, 1188 const u8 *peer, u8 action_code, u8 dialog_token, 1189 u16 status_code, u32 peer_capability, 1190 bool initiator, const u8 *extra_ies, 1191 size_t extra_ies_len) 1192 { 1193 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1194 int ret; 1195 1196 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1197 return -ENOTSUPP; 1198 1199 /* make sure we are in managed mode, and associated */ 1200 if (sdata->vif.type != NL80211_IFTYPE_STATION || 1201 !sdata->u.mgd.associated) 1202 return -EINVAL; 1203 1204 switch (action_code) { 1205 case WLAN_TDLS_SETUP_REQUEST: 1206 case WLAN_TDLS_SETUP_RESPONSE: 1207 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code, 1208 dialog_token, status_code, 1209 peer_capability, initiator, 1210 extra_ies, extra_ies_len); 1211 break; 1212 case WLAN_TDLS_TEARDOWN: 1213 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, 1214 action_code, dialog_token, 1215 status_code, 1216 peer_capability, initiator, 1217 extra_ies, extra_ies_len); 1218 break; 1219 case WLAN_TDLS_DISCOVERY_REQUEST: 1220 /* 1221 * Protect the discovery so we can hear the TDLS discovery 1222 * response frame. It is transmitted directly and not buffered 1223 * by the AP. 1224 */ 1225 drv_mgd_protect_tdls_discover(sdata->local, sdata); 1226 fallthrough; 1227 case WLAN_TDLS_SETUP_CONFIRM: 1228 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 1229 /* no special handling */ 1230 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1231 action_code, 1232 dialog_token, 1233 status_code, 1234 peer_capability, 1235 initiator, extra_ies, 1236 extra_ies_len, 0, NULL); 1237 break; 1238 default: 1239 ret = -EOPNOTSUPP; 1240 break; 1241 } 1242 1243 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n", 1244 action_code, peer, ret); 1245 return ret; 1246 } 1247 1248 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata, 1249 struct sta_info *sta) 1250 { 1251 struct ieee80211_local *local = sdata->local; 1252 struct ieee80211_chanctx_conf *conf; 1253 struct ieee80211_chanctx *ctx; 1254 enum nl80211_chan_width width; 1255 struct ieee80211_supported_band *sband; 1256 1257 mutex_lock(&local->chanctx_mtx); 1258 conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf, 1259 lockdep_is_held(&local->chanctx_mtx)); 1260 if (conf) { 1261 width = conf->def.width; 1262 sband = local->hw.wiphy->bands[conf->def.chan->band]; 1263 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1264 ieee80211_recalc_chanctx_chantype(local, ctx); 1265 1266 /* if width changed and a peer is given, update its BW */ 1267 if (width != conf->def.width && sta && 1268 test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) { 1269 enum ieee80211_sta_rx_bandwidth bw; 1270 1271 bw = ieee80211_chan_width_to_rx_bw(conf->def.width); 1272 bw = min(bw, ieee80211_sta_cap_rx_bw(&sta->deflink)); 1273 if (bw != sta->sta.deflink.bandwidth) { 1274 sta->sta.deflink.bandwidth = bw; 1275 rate_control_rate_update(local, sband, sta, 0, 1276 IEEE80211_RC_BW_CHANGED); 1277 /* 1278 * if a TDLS peer BW was updated, we need to 1279 * recalc the chandef width again, to get the 1280 * correct chanctx min_def 1281 */ 1282 ieee80211_recalc_chanctx_chantype(local, ctx); 1283 } 1284 } 1285 1286 } 1287 mutex_unlock(&local->chanctx_mtx); 1288 } 1289 1290 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata) 1291 { 1292 struct sta_info *sta; 1293 bool result = false; 1294 1295 rcu_read_lock(); 1296 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 1297 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 1298 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 1299 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) || 1300 !sta->sta.deflink.ht_cap.ht_supported) 1301 continue; 1302 result = true; 1303 break; 1304 } 1305 rcu_read_unlock(); 1306 1307 return result; 1308 } 1309 1310 static void 1311 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata, 1312 struct sta_info *sta) 1313 { 1314 bool tdls_ht; 1315 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | 1316 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | 1317 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; 1318 u16 opmode; 1319 1320 /* Nothing to do if the BSS connection uses HT */ 1321 if (!(sdata->deflink.u.mgd.conn_flags & IEEE80211_CONN_DISABLE_HT)) 1322 return; 1323 1324 tdls_ht = (sta && sta->sta.deflink.ht_cap.ht_supported) || 1325 iee80211_tdls_have_ht_peers(sdata); 1326 1327 opmode = sdata->vif.bss_conf.ht_operation_mode; 1328 1329 if (tdls_ht) 1330 opmode |= protection; 1331 else 1332 opmode &= ~protection; 1333 1334 if (opmode == sdata->vif.bss_conf.ht_operation_mode) 1335 return; 1336 1337 sdata->vif.bss_conf.ht_operation_mode = opmode; 1338 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1339 BSS_CHANGED_HT); 1340 } 1341 1342 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev, 1343 const u8 *peer, enum nl80211_tdls_operation oper) 1344 { 1345 struct sta_info *sta; 1346 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1347 struct ieee80211_local *local = sdata->local; 1348 int ret; 1349 1350 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1351 return -ENOTSUPP; 1352 1353 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1354 return -EINVAL; 1355 1356 switch (oper) { 1357 case NL80211_TDLS_ENABLE_LINK: 1358 case NL80211_TDLS_DISABLE_LINK: 1359 break; 1360 case NL80211_TDLS_TEARDOWN: 1361 case NL80211_TDLS_SETUP: 1362 case NL80211_TDLS_DISCOVERY_REQ: 1363 /* We don't support in-driver setup/teardown/discovery */ 1364 return -ENOTSUPP; 1365 } 1366 1367 /* protect possible bss_conf changes and avoid concurrency in 1368 * ieee80211_bss_info_change_notify() 1369 */ 1370 sdata_lock(sdata); 1371 mutex_lock(&local->mtx); 1372 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer); 1373 1374 switch (oper) { 1375 case NL80211_TDLS_ENABLE_LINK: 1376 if (sdata->vif.bss_conf.csa_active) { 1377 tdls_dbg(sdata, "TDLS: disallow link during CSA\n"); 1378 ret = -EBUSY; 1379 break; 1380 } 1381 1382 mutex_lock(&local->sta_mtx); 1383 sta = sta_info_get(sdata, peer); 1384 if (!sta) { 1385 mutex_unlock(&local->sta_mtx); 1386 ret = -ENOLINK; 1387 break; 1388 } 1389 1390 iee80211_tdls_recalc_chanctx(sdata, sta); 1391 iee80211_tdls_recalc_ht_protection(sdata, sta); 1392 1393 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1394 mutex_unlock(&local->sta_mtx); 1395 1396 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) || 1397 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)); 1398 ret = 0; 1399 break; 1400 case NL80211_TDLS_DISABLE_LINK: 1401 /* 1402 * The teardown message in ieee80211_tdls_mgmt_teardown() was 1403 * created while the queues were stopped, so it might still be 1404 * pending. Before flushing the queues we need to be sure the 1405 * message is handled by the tasklet handling pending messages, 1406 * otherwise we might start destroying the station before 1407 * sending the teardown packet. 1408 * Note that this only forces the tasklet to flush pendings - 1409 * not to stop the tasklet from rescheduling itself. 1410 */ 1411 tasklet_kill(&local->tx_pending_tasklet); 1412 /* flush a potentially queued teardown packet */ 1413 ieee80211_flush_queues(local, sdata, false); 1414 1415 ret = sta_info_destroy_addr(sdata, peer); 1416 1417 mutex_lock(&local->sta_mtx); 1418 iee80211_tdls_recalc_ht_protection(sdata, NULL); 1419 mutex_unlock(&local->sta_mtx); 1420 1421 iee80211_tdls_recalc_chanctx(sdata, NULL); 1422 break; 1423 default: 1424 ret = -ENOTSUPP; 1425 break; 1426 } 1427 1428 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1429 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work); 1430 eth_zero_addr(sdata->u.mgd.tdls_peer); 1431 } 1432 1433 if (ret == 0) 1434 ieee80211_queue_work(&sdata->local->hw, 1435 &sdata->deflink.u.mgd.request_smps_work); 1436 1437 mutex_unlock(&local->mtx); 1438 sdata_unlock(sdata); 1439 return ret; 1440 } 1441 1442 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer, 1443 enum nl80211_tdls_operation oper, 1444 u16 reason_code, gfp_t gfp) 1445 { 1446 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1447 1448 if (vif->type != NL80211_IFTYPE_STATION || !vif->cfg.assoc) { 1449 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n", 1450 oper); 1451 return; 1452 } 1453 1454 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp); 1455 } 1456 EXPORT_SYMBOL(ieee80211_tdls_oper_request); 1457 1458 static void 1459 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout) 1460 { 1461 struct ieee80211_ch_switch_timing *ch_sw; 1462 1463 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING; 1464 *buf++ = sizeof(struct ieee80211_ch_switch_timing); 1465 1466 ch_sw = (void *)buf; 1467 ch_sw->switch_time = cpu_to_le16(switch_time); 1468 ch_sw->switch_timeout = cpu_to_le16(switch_timeout); 1469 } 1470 1471 /* find switch timing IE in SKB ready for Tx */ 1472 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb) 1473 { 1474 struct ieee80211_tdls_data *tf; 1475 const u8 *ie_start; 1476 1477 /* 1478 * Get the offset for the new location of the switch timing IE. 1479 * The SKB network header will now point to the "payload_type" 1480 * element of the TDLS data frame struct. 1481 */ 1482 tf = container_of(skb->data + skb_network_offset(skb), 1483 struct ieee80211_tdls_data, payload_type); 1484 ie_start = tf->u.chan_switch_req.variable; 1485 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start, 1486 skb->len - (ie_start - skb->data)); 1487 } 1488 1489 static struct sk_buff * 1490 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class, 1491 struct cfg80211_chan_def *chandef, 1492 u32 *ch_sw_tm_ie_offset) 1493 { 1494 struct ieee80211_sub_if_data *sdata = sta->sdata; 1495 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) + 1496 2 + sizeof(struct ieee80211_ch_switch_timing)]; 1497 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing); 1498 u8 *pos = extra_ies; 1499 struct sk_buff *skb; 1500 1501 /* 1502 * if chandef points to a wide channel add a Secondary-Channel 1503 * Offset information element 1504 */ 1505 if (chandef->width == NL80211_CHAN_WIDTH_40) { 1506 struct ieee80211_sec_chan_offs_ie *sec_chan_ie; 1507 bool ht40plus; 1508 1509 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; 1510 *pos++ = sizeof(*sec_chan_ie); 1511 sec_chan_ie = (void *)pos; 1512 1513 ht40plus = cfg80211_get_chandef_type(chandef) == 1514 NL80211_CHAN_HT40PLUS; 1515 sec_chan_ie->sec_chan_offs = ht40plus ? 1516 IEEE80211_HT_PARAM_CHA_SEC_ABOVE : 1517 IEEE80211_HT_PARAM_CHA_SEC_BELOW; 1518 pos += sizeof(*sec_chan_ie); 1519 1520 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie); 1521 } 1522 1523 /* just set the values to 0, this is a template */ 1524 iee80211_tdls_add_ch_switch_timing(pos, 0, 0); 1525 1526 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1527 WLAN_TDLS_CHANNEL_SWITCH_REQUEST, 1528 0, 0, !sta->sta.tdls_initiator, 1529 extra_ies, extra_ies_len, 1530 oper_class, chandef); 1531 if (!skb) 1532 return NULL; 1533 1534 skb = ieee80211_build_data_template(sdata, skb, 0); 1535 if (IS_ERR(skb)) { 1536 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n"); 1537 return NULL; 1538 } 1539 1540 if (ch_sw_tm_ie_offset) { 1541 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1542 1543 if (!tm_ie) { 1544 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n"); 1545 dev_kfree_skb_any(skb); 1546 return NULL; 1547 } 1548 1549 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1550 } 1551 1552 tdls_dbg(sdata, 1553 "TDLS channel switch request template for %pM ch %d width %d\n", 1554 sta->sta.addr, chandef->chan->center_freq, chandef->width); 1555 return skb; 1556 } 1557 1558 int 1559 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev, 1560 const u8 *addr, u8 oper_class, 1561 struct cfg80211_chan_def *chandef) 1562 { 1563 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1564 struct ieee80211_local *local = sdata->local; 1565 struct sta_info *sta; 1566 struct sk_buff *skb = NULL; 1567 u32 ch_sw_tm_ie; 1568 int ret; 1569 1570 if (chandef->chan->freq_offset) 1571 /* this may work, but is untested */ 1572 return -EOPNOTSUPP; 1573 1574 mutex_lock(&local->sta_mtx); 1575 sta = sta_info_get(sdata, addr); 1576 if (!sta) { 1577 tdls_dbg(sdata, 1578 "Invalid TDLS peer %pM for channel switch request\n", 1579 addr); 1580 ret = -ENOENT; 1581 goto out; 1582 } 1583 1584 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) { 1585 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n", 1586 addr); 1587 ret = -ENOTSUPP; 1588 goto out; 1589 } 1590 1591 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef, 1592 &ch_sw_tm_ie); 1593 if (!skb) { 1594 ret = -ENOENT; 1595 goto out; 1596 } 1597 1598 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class, 1599 chandef, skb, ch_sw_tm_ie); 1600 if (!ret) 1601 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1602 1603 out: 1604 mutex_unlock(&local->sta_mtx); 1605 dev_kfree_skb_any(skb); 1606 return ret; 1607 } 1608 1609 void 1610 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy, 1611 struct net_device *dev, 1612 const u8 *addr) 1613 { 1614 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1615 struct ieee80211_local *local = sdata->local; 1616 struct sta_info *sta; 1617 1618 mutex_lock(&local->sta_mtx); 1619 sta = sta_info_get(sdata, addr); 1620 if (!sta) { 1621 tdls_dbg(sdata, 1622 "Invalid TDLS peer %pM for channel switch cancel\n", 1623 addr); 1624 goto out; 1625 } 1626 1627 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) { 1628 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n", 1629 addr); 1630 goto out; 1631 } 1632 1633 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta); 1634 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1635 1636 out: 1637 mutex_unlock(&local->sta_mtx); 1638 } 1639 1640 static struct sk_buff * 1641 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta, 1642 u32 *ch_sw_tm_ie_offset) 1643 { 1644 struct ieee80211_sub_if_data *sdata = sta->sdata; 1645 struct sk_buff *skb; 1646 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)]; 1647 1648 /* initial timing are always zero in the template */ 1649 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0); 1650 1651 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1652 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE, 1653 0, 0, !sta->sta.tdls_initiator, 1654 extra_ies, sizeof(extra_ies), 0, NULL); 1655 if (!skb) 1656 return NULL; 1657 1658 skb = ieee80211_build_data_template(sdata, skb, 0); 1659 if (IS_ERR(skb)) { 1660 tdls_dbg(sdata, 1661 "Failed building TDLS channel switch resp frame\n"); 1662 return NULL; 1663 } 1664 1665 if (ch_sw_tm_ie_offset) { 1666 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1667 1668 if (!tm_ie) { 1669 tdls_dbg(sdata, 1670 "No switch timing IE in TDLS switch resp\n"); 1671 dev_kfree_skb_any(skb); 1672 return NULL; 1673 } 1674 1675 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1676 } 1677 1678 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n", 1679 sta->sta.addr); 1680 return skb; 1681 } 1682 1683 static int 1684 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata, 1685 struct sk_buff *skb) 1686 { 1687 struct ieee80211_local *local = sdata->local; 1688 struct ieee802_11_elems *elems = NULL; 1689 struct sta_info *sta; 1690 struct ieee80211_tdls_data *tf = (void *)skb->data; 1691 bool local_initiator; 1692 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1693 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable); 1694 struct ieee80211_tdls_ch_sw_params params = {}; 1695 int ret; 1696 1697 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 1698 params.timestamp = rx_status->device_timestamp; 1699 1700 if (skb->len < baselen) { 1701 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n", 1702 skb->len); 1703 return -EINVAL; 1704 } 1705 1706 mutex_lock(&local->sta_mtx); 1707 sta = sta_info_get(sdata, tf->sa); 1708 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1709 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1710 tf->sa); 1711 ret = -EINVAL; 1712 goto out; 1713 } 1714 1715 params.sta = &sta->sta; 1716 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code); 1717 if (params.status != 0) { 1718 ret = 0; 1719 goto call_drv; 1720 } 1721 1722 elems = ieee802_11_parse_elems(tf->u.chan_switch_resp.variable, 1723 skb->len - baselen, false, NULL); 1724 if (!elems) { 1725 ret = -ENOMEM; 1726 goto out; 1727 } 1728 1729 if (elems->parse_error) { 1730 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n"); 1731 ret = -EINVAL; 1732 goto out; 1733 } 1734 1735 if (!elems->ch_sw_timing || !elems->lnk_id) { 1736 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n"); 1737 ret = -EINVAL; 1738 goto out; 1739 } 1740 1741 /* validate the initiator is set correctly */ 1742 local_initiator = 1743 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1744 if (local_initiator == sta->sta.tdls_initiator) { 1745 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1746 ret = -EINVAL; 1747 goto out; 1748 } 1749 1750 params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time); 1751 params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout); 1752 1753 params.tmpl_skb = 1754 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie); 1755 if (!params.tmpl_skb) { 1756 ret = -ENOENT; 1757 goto out; 1758 } 1759 1760 ret = 0; 1761 call_drv: 1762 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1763 1764 tdls_dbg(sdata, 1765 "TDLS channel switch response received from %pM status %d\n", 1766 tf->sa, params.status); 1767 1768 out: 1769 mutex_unlock(&local->sta_mtx); 1770 dev_kfree_skb_any(params.tmpl_skb); 1771 kfree(elems); 1772 return ret; 1773 } 1774 1775 static int 1776 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata, 1777 struct sk_buff *skb) 1778 { 1779 struct ieee80211_local *local = sdata->local; 1780 struct ieee802_11_elems *elems; 1781 struct cfg80211_chan_def chandef; 1782 struct ieee80211_channel *chan; 1783 enum nl80211_channel_type chan_type; 1784 int freq; 1785 u8 target_channel, oper_class; 1786 bool local_initiator; 1787 struct sta_info *sta; 1788 enum nl80211_band band; 1789 struct ieee80211_tdls_data *tf = (void *)skb->data; 1790 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1791 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable); 1792 struct ieee80211_tdls_ch_sw_params params = {}; 1793 int ret = 0; 1794 1795 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 1796 params.timestamp = rx_status->device_timestamp; 1797 1798 if (skb->len < baselen) { 1799 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n", 1800 skb->len); 1801 return -EINVAL; 1802 } 1803 1804 target_channel = tf->u.chan_switch_req.target_channel; 1805 oper_class = tf->u.chan_switch_req.oper_class; 1806 1807 /* 1808 * We can't easily infer the channel band. The operating class is 1809 * ambiguous - there are multiple tables (US/Europe/JP/Global). The 1810 * solution here is to treat channels with number >14 as 5GHz ones, 1811 * and specifically check for the (oper_class, channel) combinations 1812 * where this doesn't hold. These are thankfully unique according to 1813 * IEEE802.11-2012. 1814 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as 1815 * valid here. 1816 */ 1817 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 || 1818 oper_class == 4 || oper_class == 5 || oper_class == 6) && 1819 target_channel < 14) 1820 band = NL80211_BAND_5GHZ; 1821 else 1822 band = target_channel < 14 ? NL80211_BAND_2GHZ : 1823 NL80211_BAND_5GHZ; 1824 1825 freq = ieee80211_channel_to_frequency(target_channel, band); 1826 if (freq == 0) { 1827 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n", 1828 target_channel); 1829 return -EINVAL; 1830 } 1831 1832 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq); 1833 if (!chan) { 1834 tdls_dbg(sdata, 1835 "Unsupported channel for TDLS chan switch: %d\n", 1836 target_channel); 1837 return -EINVAL; 1838 } 1839 1840 elems = ieee802_11_parse_elems(tf->u.chan_switch_req.variable, 1841 skb->len - baselen, false, NULL); 1842 if (!elems) 1843 return -ENOMEM; 1844 1845 if (elems->parse_error) { 1846 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n"); 1847 ret = -EINVAL; 1848 goto free; 1849 } 1850 1851 if (!elems->ch_sw_timing || !elems->lnk_id) { 1852 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n"); 1853 ret = -EINVAL; 1854 goto free; 1855 } 1856 1857 if (!elems->sec_chan_offs) { 1858 chan_type = NL80211_CHAN_HT20; 1859 } else { 1860 switch (elems->sec_chan_offs->sec_chan_offs) { 1861 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 1862 chan_type = NL80211_CHAN_HT40PLUS; 1863 break; 1864 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 1865 chan_type = NL80211_CHAN_HT40MINUS; 1866 break; 1867 default: 1868 chan_type = NL80211_CHAN_HT20; 1869 break; 1870 } 1871 } 1872 1873 cfg80211_chandef_create(&chandef, chan, chan_type); 1874 1875 /* we will be active on the TDLS link */ 1876 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef, 1877 sdata->wdev.iftype)) { 1878 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n"); 1879 ret = -EINVAL; 1880 goto free; 1881 } 1882 1883 mutex_lock(&local->sta_mtx); 1884 sta = sta_info_get(sdata, tf->sa); 1885 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1886 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1887 tf->sa); 1888 ret = -EINVAL; 1889 goto out; 1890 } 1891 1892 params.sta = &sta->sta; 1893 1894 /* validate the initiator is set correctly */ 1895 local_initiator = 1896 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1897 if (local_initiator == sta->sta.tdls_initiator) { 1898 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1899 ret = -EINVAL; 1900 goto out; 1901 } 1902 1903 /* peer should have known better */ 1904 if (!sta->sta.deflink.ht_cap.ht_supported && elems->sec_chan_offs && 1905 elems->sec_chan_offs->sec_chan_offs) { 1906 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n"); 1907 ret = -ENOTSUPP; 1908 goto out; 1909 } 1910 1911 params.chandef = &chandef; 1912 params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time); 1913 params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout); 1914 1915 params.tmpl_skb = 1916 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, 1917 ¶ms.ch_sw_tm_ie); 1918 if (!params.tmpl_skb) { 1919 ret = -ENOENT; 1920 goto out; 1921 } 1922 1923 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1924 1925 tdls_dbg(sdata, 1926 "TDLS ch switch request received from %pM ch %d width %d\n", 1927 tf->sa, params.chandef->chan->center_freq, 1928 params.chandef->width); 1929 out: 1930 mutex_unlock(&local->sta_mtx); 1931 dev_kfree_skb_any(params.tmpl_skb); 1932 free: 1933 kfree(elems); 1934 return ret; 1935 } 1936 1937 void 1938 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata, 1939 struct sk_buff *skb) 1940 { 1941 struct ieee80211_tdls_data *tf = (void *)skb->data; 1942 struct wiphy *wiphy = sdata->local->hw.wiphy; 1943 1944 lockdep_assert_wiphy(wiphy); 1945 1946 /* make sure the driver supports it */ 1947 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH)) 1948 return; 1949 1950 /* we want to access the entire packet */ 1951 if (skb_linearize(skb)) 1952 return; 1953 /* 1954 * The packet/size was already validated by mac80211 Rx path, only look 1955 * at the action type. 1956 */ 1957 switch (tf->action_code) { 1958 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 1959 ieee80211_process_tdls_channel_switch_req(sdata, skb); 1960 break; 1961 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 1962 ieee80211_process_tdls_channel_switch_resp(sdata, skb); 1963 break; 1964 default: 1965 WARN_ON_ONCE(1); 1966 return; 1967 } 1968 } 1969 1970 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata) 1971 { 1972 struct sta_info *sta; 1973 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED; 1974 1975 rcu_read_lock(); 1976 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 1977 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 1978 !test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 1979 continue; 1980 1981 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr, 1982 NL80211_TDLS_TEARDOWN, reason, 1983 GFP_ATOMIC); 1984 } 1985 rcu_read_unlock(); 1986 } 1987 1988 void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata, 1989 const u8 *peer, u16 reason) 1990 { 1991 struct ieee80211_sta *sta; 1992 1993 rcu_read_lock(); 1994 sta = ieee80211_find_sta(&sdata->vif, peer); 1995 if (!sta || !sta->tdls) { 1996 rcu_read_unlock(); 1997 return; 1998 } 1999 rcu_read_unlock(); 2000 2001 tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n", 2002 peer, reason, 2003 ieee80211_get_reason_code_string(reason)); 2004 2005 ieee80211_tdls_oper_request(&sdata->vif, peer, 2006 NL80211_TDLS_TEARDOWN, 2007 WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE, 2008 GFP_ATOMIC); 2009 } 2010