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 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, skb)); 1020 1021 /* 1022 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress. 1023 * Later, if no ACK is returned from peer, we will re-send the teardown 1024 * packet through the AP. 1025 */ 1026 if ((action_code == WLAN_TDLS_TEARDOWN) && 1027 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) { 1028 bool try_resend; /* Should we keep skb for possible resend */ 1029 1030 /* If not sending directly to peer - no point in keeping skb */ 1031 rcu_read_lock(); 1032 sta = sta_info_get(sdata, peer); 1033 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1034 rcu_read_unlock(); 1035 1036 spin_lock_bh(&sdata->u.mgd.teardown_lock); 1037 if (try_resend && !sdata->u.mgd.teardown_skb) { 1038 /* Mark it as requiring TX status callback */ 1039 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | 1040 IEEE80211_TX_INTFL_MLME_CONN_TX; 1041 1042 /* 1043 * skb is copied since mac80211 will later set 1044 * properties that might not be the same as the AP, 1045 * such as encryption, QoS, addresses, etc. 1046 * 1047 * No problem if skb_copy() fails, so no need to check. 1048 */ 1049 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC); 1050 sdata->u.mgd.orig_teardown_skb = skb; 1051 } 1052 spin_unlock_bh(&sdata->u.mgd.teardown_lock); 1053 } 1054 1055 /* disable bottom halves when entering the Tx path */ 1056 local_bh_disable(); 1057 __ieee80211_subif_start_xmit(skb, dev, flags, 1058 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 1059 local_bh_enable(); 1060 1061 return ret; 1062 1063 fail: 1064 dev_kfree_skb(skb); 1065 return ret; 1066 } 1067 1068 static int 1069 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev, 1070 const u8 *peer, u8 action_code, u8 dialog_token, 1071 u16 status_code, u32 peer_capability, bool initiator, 1072 const u8 *extra_ies, size_t extra_ies_len) 1073 { 1074 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1075 struct ieee80211_local *local = sdata->local; 1076 enum ieee80211_smps_mode smps_mode = 1077 sdata->deflink.u.mgd.driver_smps_mode; 1078 int ret; 1079 1080 /* don't support setup with forced SMPS mode that's not off */ 1081 if (smps_mode != IEEE80211_SMPS_AUTOMATIC && 1082 smps_mode != IEEE80211_SMPS_OFF) { 1083 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n", 1084 smps_mode); 1085 return -ENOTSUPP; 1086 } 1087 1088 mutex_lock(&local->mtx); 1089 1090 /* we don't support concurrent TDLS peer setups */ 1091 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) && 1092 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1093 ret = -EBUSY; 1094 goto out_unlock; 1095 } 1096 1097 /* 1098 * make sure we have a STA representing the peer so we drop or buffer 1099 * non-TDLS-setup frames to the peer. We can't send other packets 1100 * during setup through the AP path. 1101 * Allow error packets to be sent - sometimes we don't even add a STA 1102 * before failing the setup. 1103 */ 1104 if (status_code == 0) { 1105 rcu_read_lock(); 1106 if (!sta_info_get(sdata, peer)) { 1107 rcu_read_unlock(); 1108 ret = -ENOLINK; 1109 goto out_unlock; 1110 } 1111 rcu_read_unlock(); 1112 } 1113 1114 ieee80211_flush_queues(local, sdata, false); 1115 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN); 1116 mutex_unlock(&local->mtx); 1117 1118 /* we cannot take the mutex while preparing the setup packet */ 1119 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code, 1120 dialog_token, status_code, 1121 peer_capability, initiator, 1122 extra_ies, extra_ies_len, 0, 1123 NULL); 1124 if (ret < 0) { 1125 mutex_lock(&local->mtx); 1126 eth_zero_addr(sdata->u.mgd.tdls_peer); 1127 mutex_unlock(&local->mtx); 1128 return ret; 1129 } 1130 1131 ieee80211_queue_delayed_work(&sdata->local->hw, 1132 &sdata->u.mgd.tdls_peer_del_work, 1133 TDLS_PEER_SETUP_TIMEOUT); 1134 return 0; 1135 1136 out_unlock: 1137 mutex_unlock(&local->mtx); 1138 return ret; 1139 } 1140 1141 static int 1142 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev, 1143 const u8 *peer, u8 action_code, u8 dialog_token, 1144 u16 status_code, u32 peer_capability, 1145 bool initiator, const u8 *extra_ies, 1146 size_t extra_ies_len) 1147 { 1148 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1149 struct ieee80211_local *local = sdata->local; 1150 struct sta_info *sta; 1151 int ret; 1152 1153 /* 1154 * No packets can be transmitted to the peer via the AP during setup - 1155 * the STA is set as a TDLS peer, but is not authorized. 1156 * During teardown, we prevent direct transmissions by stopping the 1157 * queues and flushing all direct packets. 1158 */ 1159 ieee80211_stop_vif_queues(local, sdata, 1160 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1161 ieee80211_flush_queues(local, sdata, false); 1162 1163 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code, 1164 dialog_token, status_code, 1165 peer_capability, initiator, 1166 extra_ies, extra_ies_len, 0, 1167 NULL); 1168 if (ret < 0) 1169 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n", 1170 ret); 1171 1172 /* 1173 * Remove the STA AUTH flag to force further traffic through the AP. If 1174 * the STA was unreachable, it was already removed. 1175 */ 1176 rcu_read_lock(); 1177 sta = sta_info_get(sdata, peer); 1178 if (sta) 1179 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1180 rcu_read_unlock(); 1181 1182 ieee80211_wake_vif_queues(local, sdata, 1183 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1184 1185 return 0; 1186 } 1187 1188 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev, 1189 const u8 *peer, u8 action_code, u8 dialog_token, 1190 u16 status_code, u32 peer_capability, 1191 bool initiator, const u8 *extra_ies, 1192 size_t extra_ies_len) 1193 { 1194 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1195 int ret; 1196 1197 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1198 return -ENOTSUPP; 1199 1200 /* make sure we are in managed mode, and associated */ 1201 if (sdata->vif.type != NL80211_IFTYPE_STATION || 1202 !sdata->u.mgd.associated) 1203 return -EINVAL; 1204 1205 switch (action_code) { 1206 case WLAN_TDLS_SETUP_REQUEST: 1207 case WLAN_TDLS_SETUP_RESPONSE: 1208 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code, 1209 dialog_token, status_code, 1210 peer_capability, initiator, 1211 extra_ies, extra_ies_len); 1212 break; 1213 case WLAN_TDLS_TEARDOWN: 1214 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, 1215 action_code, dialog_token, 1216 status_code, 1217 peer_capability, initiator, 1218 extra_ies, extra_ies_len); 1219 break; 1220 case WLAN_TDLS_DISCOVERY_REQUEST: 1221 /* 1222 * Protect the discovery so we can hear the TDLS discovery 1223 * response frame. It is transmitted directly and not buffered 1224 * by the AP. 1225 */ 1226 drv_mgd_protect_tdls_discover(sdata->local, sdata); 1227 fallthrough; 1228 case WLAN_TDLS_SETUP_CONFIRM: 1229 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 1230 /* no special handling */ 1231 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1232 action_code, 1233 dialog_token, 1234 status_code, 1235 peer_capability, 1236 initiator, extra_ies, 1237 extra_ies_len, 0, NULL); 1238 break; 1239 default: 1240 ret = -EOPNOTSUPP; 1241 break; 1242 } 1243 1244 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n", 1245 action_code, peer, ret); 1246 return ret; 1247 } 1248 1249 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata, 1250 struct sta_info *sta) 1251 { 1252 struct ieee80211_local *local = sdata->local; 1253 struct ieee80211_chanctx_conf *conf; 1254 struct ieee80211_chanctx *ctx; 1255 enum nl80211_chan_width width; 1256 struct ieee80211_supported_band *sband; 1257 1258 mutex_lock(&local->chanctx_mtx); 1259 conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf, 1260 lockdep_is_held(&local->chanctx_mtx)); 1261 if (conf) { 1262 width = conf->def.width; 1263 sband = local->hw.wiphy->bands[conf->def.chan->band]; 1264 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1265 ieee80211_recalc_chanctx_chantype(local, ctx); 1266 1267 /* if width changed and a peer is given, update its BW */ 1268 if (width != conf->def.width && sta && 1269 test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) { 1270 enum ieee80211_sta_rx_bandwidth bw; 1271 1272 bw = ieee80211_chan_width_to_rx_bw(conf->def.width); 1273 bw = min(bw, ieee80211_sta_cap_rx_bw(&sta->deflink)); 1274 if (bw != sta->sta.deflink.bandwidth) { 1275 sta->sta.deflink.bandwidth = bw; 1276 rate_control_rate_update(local, sband, sta, 0, 1277 IEEE80211_RC_BW_CHANGED); 1278 /* 1279 * if a TDLS peer BW was updated, we need to 1280 * recalc the chandef width again, to get the 1281 * correct chanctx min_def 1282 */ 1283 ieee80211_recalc_chanctx_chantype(local, ctx); 1284 } 1285 } 1286 1287 } 1288 mutex_unlock(&local->chanctx_mtx); 1289 } 1290 1291 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata) 1292 { 1293 struct sta_info *sta; 1294 bool result = false; 1295 1296 rcu_read_lock(); 1297 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 1298 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 1299 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 1300 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) || 1301 !sta->sta.deflink.ht_cap.ht_supported) 1302 continue; 1303 result = true; 1304 break; 1305 } 1306 rcu_read_unlock(); 1307 1308 return result; 1309 } 1310 1311 static void 1312 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata, 1313 struct sta_info *sta) 1314 { 1315 bool tdls_ht; 1316 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | 1317 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | 1318 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; 1319 u16 opmode; 1320 1321 /* Nothing to do if the BSS connection uses HT */ 1322 if (!(sdata->deflink.u.mgd.conn_flags & IEEE80211_CONN_DISABLE_HT)) 1323 return; 1324 1325 tdls_ht = (sta && sta->sta.deflink.ht_cap.ht_supported) || 1326 iee80211_tdls_have_ht_peers(sdata); 1327 1328 opmode = sdata->vif.bss_conf.ht_operation_mode; 1329 1330 if (tdls_ht) 1331 opmode |= protection; 1332 else 1333 opmode &= ~protection; 1334 1335 if (opmode == sdata->vif.bss_conf.ht_operation_mode) 1336 return; 1337 1338 sdata->vif.bss_conf.ht_operation_mode = opmode; 1339 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1340 BSS_CHANGED_HT); 1341 } 1342 1343 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev, 1344 const u8 *peer, enum nl80211_tdls_operation oper) 1345 { 1346 struct sta_info *sta; 1347 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1348 struct ieee80211_local *local = sdata->local; 1349 int ret; 1350 1351 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1352 return -ENOTSUPP; 1353 1354 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1355 return -EINVAL; 1356 1357 switch (oper) { 1358 case NL80211_TDLS_ENABLE_LINK: 1359 case NL80211_TDLS_DISABLE_LINK: 1360 break; 1361 case NL80211_TDLS_TEARDOWN: 1362 case NL80211_TDLS_SETUP: 1363 case NL80211_TDLS_DISCOVERY_REQ: 1364 /* We don't support in-driver setup/teardown/discovery */ 1365 return -ENOTSUPP; 1366 } 1367 1368 /* protect possible bss_conf changes and avoid concurrency in 1369 * ieee80211_bss_info_change_notify() 1370 */ 1371 sdata_lock(sdata); 1372 mutex_lock(&local->mtx); 1373 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer); 1374 1375 switch (oper) { 1376 case NL80211_TDLS_ENABLE_LINK: 1377 if (sdata->vif.bss_conf.csa_active) { 1378 tdls_dbg(sdata, "TDLS: disallow link during CSA\n"); 1379 ret = -EBUSY; 1380 break; 1381 } 1382 1383 mutex_lock(&local->sta_mtx); 1384 sta = sta_info_get(sdata, peer); 1385 if (!sta) { 1386 mutex_unlock(&local->sta_mtx); 1387 ret = -ENOLINK; 1388 break; 1389 } 1390 1391 iee80211_tdls_recalc_chanctx(sdata, sta); 1392 iee80211_tdls_recalc_ht_protection(sdata, sta); 1393 1394 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1395 mutex_unlock(&local->sta_mtx); 1396 1397 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) || 1398 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)); 1399 ret = 0; 1400 break; 1401 case NL80211_TDLS_DISABLE_LINK: 1402 /* 1403 * The teardown message in ieee80211_tdls_mgmt_teardown() was 1404 * created while the queues were stopped, so it might still be 1405 * pending. Before flushing the queues we need to be sure the 1406 * message is handled by the tasklet handling pending messages, 1407 * otherwise we might start destroying the station before 1408 * sending the teardown packet. 1409 * Note that this only forces the tasklet to flush pendings - 1410 * not to stop the tasklet from rescheduling itself. 1411 */ 1412 tasklet_kill(&local->tx_pending_tasklet); 1413 /* flush a potentially queued teardown packet */ 1414 ieee80211_flush_queues(local, sdata, false); 1415 1416 ret = sta_info_destroy_addr(sdata, peer); 1417 1418 mutex_lock(&local->sta_mtx); 1419 iee80211_tdls_recalc_ht_protection(sdata, NULL); 1420 mutex_unlock(&local->sta_mtx); 1421 1422 iee80211_tdls_recalc_chanctx(sdata, NULL); 1423 break; 1424 default: 1425 ret = -ENOTSUPP; 1426 break; 1427 } 1428 1429 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1430 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work); 1431 eth_zero_addr(sdata->u.mgd.tdls_peer); 1432 } 1433 1434 if (ret == 0) 1435 ieee80211_queue_work(&sdata->local->hw, 1436 &sdata->deflink.u.mgd.request_smps_work); 1437 1438 mutex_unlock(&local->mtx); 1439 sdata_unlock(sdata); 1440 return ret; 1441 } 1442 1443 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer, 1444 enum nl80211_tdls_operation oper, 1445 u16 reason_code, gfp_t gfp) 1446 { 1447 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1448 1449 if (vif->type != NL80211_IFTYPE_STATION || !vif->cfg.assoc) { 1450 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n", 1451 oper); 1452 return; 1453 } 1454 1455 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp); 1456 } 1457 EXPORT_SYMBOL(ieee80211_tdls_oper_request); 1458 1459 static void 1460 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout) 1461 { 1462 struct ieee80211_ch_switch_timing *ch_sw; 1463 1464 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING; 1465 *buf++ = sizeof(struct ieee80211_ch_switch_timing); 1466 1467 ch_sw = (void *)buf; 1468 ch_sw->switch_time = cpu_to_le16(switch_time); 1469 ch_sw->switch_timeout = cpu_to_le16(switch_timeout); 1470 } 1471 1472 /* find switch timing IE in SKB ready for Tx */ 1473 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb) 1474 { 1475 struct ieee80211_tdls_data *tf; 1476 const u8 *ie_start; 1477 1478 /* 1479 * Get the offset for the new location of the switch timing IE. 1480 * The SKB network header will now point to the "payload_type" 1481 * element of the TDLS data frame struct. 1482 */ 1483 tf = container_of(skb->data + skb_network_offset(skb), 1484 struct ieee80211_tdls_data, payload_type); 1485 ie_start = tf->u.chan_switch_req.variable; 1486 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start, 1487 skb->len - (ie_start - skb->data)); 1488 } 1489 1490 static struct sk_buff * 1491 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class, 1492 struct cfg80211_chan_def *chandef, 1493 u32 *ch_sw_tm_ie_offset) 1494 { 1495 struct ieee80211_sub_if_data *sdata = sta->sdata; 1496 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) + 1497 2 + sizeof(struct ieee80211_ch_switch_timing)]; 1498 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing); 1499 u8 *pos = extra_ies; 1500 struct sk_buff *skb; 1501 1502 /* 1503 * if chandef points to a wide channel add a Secondary-Channel 1504 * Offset information element 1505 */ 1506 if (chandef->width == NL80211_CHAN_WIDTH_40) { 1507 struct ieee80211_sec_chan_offs_ie *sec_chan_ie; 1508 bool ht40plus; 1509 1510 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; 1511 *pos++ = sizeof(*sec_chan_ie); 1512 sec_chan_ie = (void *)pos; 1513 1514 ht40plus = cfg80211_get_chandef_type(chandef) == 1515 NL80211_CHAN_HT40PLUS; 1516 sec_chan_ie->sec_chan_offs = ht40plus ? 1517 IEEE80211_HT_PARAM_CHA_SEC_ABOVE : 1518 IEEE80211_HT_PARAM_CHA_SEC_BELOW; 1519 pos += sizeof(*sec_chan_ie); 1520 1521 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie); 1522 } 1523 1524 /* just set the values to 0, this is a template */ 1525 iee80211_tdls_add_ch_switch_timing(pos, 0, 0); 1526 1527 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1528 WLAN_TDLS_CHANNEL_SWITCH_REQUEST, 1529 0, 0, !sta->sta.tdls_initiator, 1530 extra_ies, extra_ies_len, 1531 oper_class, chandef); 1532 if (!skb) 1533 return NULL; 1534 1535 skb = ieee80211_build_data_template(sdata, skb, 0); 1536 if (IS_ERR(skb)) { 1537 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n"); 1538 return NULL; 1539 } 1540 1541 if (ch_sw_tm_ie_offset) { 1542 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1543 1544 if (!tm_ie) { 1545 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n"); 1546 dev_kfree_skb_any(skb); 1547 return NULL; 1548 } 1549 1550 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1551 } 1552 1553 tdls_dbg(sdata, 1554 "TDLS channel switch request template for %pM ch %d width %d\n", 1555 sta->sta.addr, chandef->chan->center_freq, chandef->width); 1556 return skb; 1557 } 1558 1559 int 1560 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev, 1561 const u8 *addr, u8 oper_class, 1562 struct cfg80211_chan_def *chandef) 1563 { 1564 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1565 struct ieee80211_local *local = sdata->local; 1566 struct sta_info *sta; 1567 struct sk_buff *skb = NULL; 1568 u32 ch_sw_tm_ie; 1569 int ret; 1570 1571 if (chandef->chan->freq_offset) 1572 /* this may work, but is untested */ 1573 return -EOPNOTSUPP; 1574 1575 mutex_lock(&local->sta_mtx); 1576 sta = sta_info_get(sdata, addr); 1577 if (!sta) { 1578 tdls_dbg(sdata, 1579 "Invalid TDLS peer %pM for channel switch request\n", 1580 addr); 1581 ret = -ENOENT; 1582 goto out; 1583 } 1584 1585 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) { 1586 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n", 1587 addr); 1588 ret = -ENOTSUPP; 1589 goto out; 1590 } 1591 1592 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef, 1593 &ch_sw_tm_ie); 1594 if (!skb) { 1595 ret = -ENOENT; 1596 goto out; 1597 } 1598 1599 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class, 1600 chandef, skb, ch_sw_tm_ie); 1601 if (!ret) 1602 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1603 1604 out: 1605 mutex_unlock(&local->sta_mtx); 1606 dev_kfree_skb_any(skb); 1607 return ret; 1608 } 1609 1610 void 1611 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy, 1612 struct net_device *dev, 1613 const u8 *addr) 1614 { 1615 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1616 struct ieee80211_local *local = sdata->local; 1617 struct sta_info *sta; 1618 1619 mutex_lock(&local->sta_mtx); 1620 sta = sta_info_get(sdata, addr); 1621 if (!sta) { 1622 tdls_dbg(sdata, 1623 "Invalid TDLS peer %pM for channel switch cancel\n", 1624 addr); 1625 goto out; 1626 } 1627 1628 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) { 1629 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n", 1630 addr); 1631 goto out; 1632 } 1633 1634 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta); 1635 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1636 1637 out: 1638 mutex_unlock(&local->sta_mtx); 1639 } 1640 1641 static struct sk_buff * 1642 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta, 1643 u32 *ch_sw_tm_ie_offset) 1644 { 1645 struct ieee80211_sub_if_data *sdata = sta->sdata; 1646 struct sk_buff *skb; 1647 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)]; 1648 1649 /* initial timing are always zero in the template */ 1650 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0); 1651 1652 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1653 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE, 1654 0, 0, !sta->sta.tdls_initiator, 1655 extra_ies, sizeof(extra_ies), 0, NULL); 1656 if (!skb) 1657 return NULL; 1658 1659 skb = ieee80211_build_data_template(sdata, skb, 0); 1660 if (IS_ERR(skb)) { 1661 tdls_dbg(sdata, 1662 "Failed building TDLS channel switch resp frame\n"); 1663 return NULL; 1664 } 1665 1666 if (ch_sw_tm_ie_offset) { 1667 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1668 1669 if (!tm_ie) { 1670 tdls_dbg(sdata, 1671 "No switch timing IE in TDLS switch resp\n"); 1672 dev_kfree_skb_any(skb); 1673 return NULL; 1674 } 1675 1676 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1677 } 1678 1679 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n", 1680 sta->sta.addr); 1681 return skb; 1682 } 1683 1684 static int 1685 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata, 1686 struct sk_buff *skb) 1687 { 1688 struct ieee80211_local *local = sdata->local; 1689 struct ieee802_11_elems *elems = NULL; 1690 struct sta_info *sta; 1691 struct ieee80211_tdls_data *tf = (void *)skb->data; 1692 bool local_initiator; 1693 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1694 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable); 1695 struct ieee80211_tdls_ch_sw_params params = {}; 1696 int ret; 1697 1698 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 1699 params.timestamp = rx_status->device_timestamp; 1700 1701 if (skb->len < baselen) { 1702 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n", 1703 skb->len); 1704 return -EINVAL; 1705 } 1706 1707 mutex_lock(&local->sta_mtx); 1708 sta = sta_info_get(sdata, tf->sa); 1709 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1710 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1711 tf->sa); 1712 ret = -EINVAL; 1713 goto out; 1714 } 1715 1716 params.sta = &sta->sta; 1717 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code); 1718 if (params.status != 0) { 1719 ret = 0; 1720 goto call_drv; 1721 } 1722 1723 elems = ieee802_11_parse_elems(tf->u.chan_switch_resp.variable, 1724 skb->len - baselen, false, NULL); 1725 if (!elems) { 1726 ret = -ENOMEM; 1727 goto out; 1728 } 1729 1730 if (elems->parse_error) { 1731 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n"); 1732 ret = -EINVAL; 1733 goto out; 1734 } 1735 1736 if (!elems->ch_sw_timing || !elems->lnk_id) { 1737 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n"); 1738 ret = -EINVAL; 1739 goto out; 1740 } 1741 1742 /* validate the initiator is set correctly */ 1743 local_initiator = 1744 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1745 if (local_initiator == sta->sta.tdls_initiator) { 1746 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1747 ret = -EINVAL; 1748 goto out; 1749 } 1750 1751 params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time); 1752 params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout); 1753 1754 params.tmpl_skb = 1755 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie); 1756 if (!params.tmpl_skb) { 1757 ret = -ENOENT; 1758 goto out; 1759 } 1760 1761 ret = 0; 1762 call_drv: 1763 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1764 1765 tdls_dbg(sdata, 1766 "TDLS channel switch response received from %pM status %d\n", 1767 tf->sa, params.status); 1768 1769 out: 1770 mutex_unlock(&local->sta_mtx); 1771 dev_kfree_skb_any(params.tmpl_skb); 1772 kfree(elems); 1773 return ret; 1774 } 1775 1776 static int 1777 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata, 1778 struct sk_buff *skb) 1779 { 1780 struct ieee80211_local *local = sdata->local; 1781 struct ieee802_11_elems *elems; 1782 struct cfg80211_chan_def chandef; 1783 struct ieee80211_channel *chan; 1784 enum nl80211_channel_type chan_type; 1785 int freq; 1786 u8 target_channel, oper_class; 1787 bool local_initiator; 1788 struct sta_info *sta; 1789 enum nl80211_band band; 1790 struct ieee80211_tdls_data *tf = (void *)skb->data; 1791 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1792 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable); 1793 struct ieee80211_tdls_ch_sw_params params = {}; 1794 int ret = 0; 1795 1796 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 1797 params.timestamp = rx_status->device_timestamp; 1798 1799 if (skb->len < baselen) { 1800 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n", 1801 skb->len); 1802 return -EINVAL; 1803 } 1804 1805 target_channel = tf->u.chan_switch_req.target_channel; 1806 oper_class = tf->u.chan_switch_req.oper_class; 1807 1808 /* 1809 * We can't easily infer the channel band. The operating class is 1810 * ambiguous - there are multiple tables (US/Europe/JP/Global). The 1811 * solution here is to treat channels with number >14 as 5GHz ones, 1812 * and specifically check for the (oper_class, channel) combinations 1813 * where this doesn't hold. These are thankfully unique according to 1814 * IEEE802.11-2012. 1815 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as 1816 * valid here. 1817 */ 1818 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 || 1819 oper_class == 4 || oper_class == 5 || oper_class == 6) && 1820 target_channel < 14) 1821 band = NL80211_BAND_5GHZ; 1822 else 1823 band = target_channel < 14 ? NL80211_BAND_2GHZ : 1824 NL80211_BAND_5GHZ; 1825 1826 freq = ieee80211_channel_to_frequency(target_channel, band); 1827 if (freq == 0) { 1828 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n", 1829 target_channel); 1830 return -EINVAL; 1831 } 1832 1833 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq); 1834 if (!chan) { 1835 tdls_dbg(sdata, 1836 "Unsupported channel for TDLS chan switch: %d\n", 1837 target_channel); 1838 return -EINVAL; 1839 } 1840 1841 elems = ieee802_11_parse_elems(tf->u.chan_switch_req.variable, 1842 skb->len - baselen, false, NULL); 1843 if (!elems) 1844 return -ENOMEM; 1845 1846 if (elems->parse_error) { 1847 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n"); 1848 ret = -EINVAL; 1849 goto free; 1850 } 1851 1852 if (!elems->ch_sw_timing || !elems->lnk_id) { 1853 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n"); 1854 ret = -EINVAL; 1855 goto free; 1856 } 1857 1858 if (!elems->sec_chan_offs) { 1859 chan_type = NL80211_CHAN_HT20; 1860 } else { 1861 switch (elems->sec_chan_offs->sec_chan_offs) { 1862 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 1863 chan_type = NL80211_CHAN_HT40PLUS; 1864 break; 1865 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 1866 chan_type = NL80211_CHAN_HT40MINUS; 1867 break; 1868 default: 1869 chan_type = NL80211_CHAN_HT20; 1870 break; 1871 } 1872 } 1873 1874 cfg80211_chandef_create(&chandef, chan, chan_type); 1875 1876 /* we will be active on the TDLS link */ 1877 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef, 1878 sdata->wdev.iftype)) { 1879 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n"); 1880 ret = -EINVAL; 1881 goto free; 1882 } 1883 1884 mutex_lock(&local->sta_mtx); 1885 sta = sta_info_get(sdata, tf->sa); 1886 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1887 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1888 tf->sa); 1889 ret = -EINVAL; 1890 goto out; 1891 } 1892 1893 params.sta = &sta->sta; 1894 1895 /* validate the initiator is set correctly */ 1896 local_initiator = 1897 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1898 if (local_initiator == sta->sta.tdls_initiator) { 1899 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1900 ret = -EINVAL; 1901 goto out; 1902 } 1903 1904 /* peer should have known better */ 1905 if (!sta->sta.deflink.ht_cap.ht_supported && elems->sec_chan_offs && 1906 elems->sec_chan_offs->sec_chan_offs) { 1907 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n"); 1908 ret = -ENOTSUPP; 1909 goto out; 1910 } 1911 1912 params.chandef = &chandef; 1913 params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time); 1914 params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout); 1915 1916 params.tmpl_skb = 1917 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, 1918 ¶ms.ch_sw_tm_ie); 1919 if (!params.tmpl_skb) { 1920 ret = -ENOENT; 1921 goto out; 1922 } 1923 1924 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1925 1926 tdls_dbg(sdata, 1927 "TDLS ch switch request received from %pM ch %d width %d\n", 1928 tf->sa, params.chandef->chan->center_freq, 1929 params.chandef->width); 1930 out: 1931 mutex_unlock(&local->sta_mtx); 1932 dev_kfree_skb_any(params.tmpl_skb); 1933 free: 1934 kfree(elems); 1935 return ret; 1936 } 1937 1938 void 1939 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata, 1940 struct sk_buff *skb) 1941 { 1942 struct ieee80211_tdls_data *tf = (void *)skb->data; 1943 struct wiphy *wiphy = sdata->local->hw.wiphy; 1944 1945 lockdep_assert_wiphy(wiphy); 1946 1947 /* make sure the driver supports it */ 1948 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH)) 1949 return; 1950 1951 /* we want to access the entire packet */ 1952 if (skb_linearize(skb)) 1953 return; 1954 /* 1955 * The packet/size was already validated by mac80211 Rx path, only look 1956 * at the action type. 1957 */ 1958 switch (tf->action_code) { 1959 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 1960 ieee80211_process_tdls_channel_switch_req(sdata, skb); 1961 break; 1962 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 1963 ieee80211_process_tdls_channel_switch_resp(sdata, skb); 1964 break; 1965 default: 1966 WARN_ON_ONCE(1); 1967 return; 1968 } 1969 } 1970 1971 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata) 1972 { 1973 struct sta_info *sta; 1974 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED; 1975 1976 rcu_read_lock(); 1977 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 1978 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 1979 !test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 1980 continue; 1981 1982 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr, 1983 NL80211_TDLS_TEARDOWN, reason, 1984 GFP_ATOMIC); 1985 } 1986 rcu_read_unlock(); 1987 } 1988 1989 void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata, 1990 const u8 *peer, u16 reason) 1991 { 1992 struct ieee80211_sta *sta; 1993 1994 rcu_read_lock(); 1995 sta = ieee80211_find_sta(&sdata->vif, peer); 1996 if (!sta || !sta->tdls) { 1997 rcu_read_unlock(); 1998 return; 1999 } 2000 rcu_read_unlock(); 2001 2002 tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n", 2003 peer, reason, 2004 ieee80211_get_reason_code_string(reason)); 2005 2006 ieee80211_tdls_oper_request(&sdata->vif, peer, 2007 NL80211_TDLS_TEARDOWN, 2008 WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE, 2009 GFP_ATOMIC); 2010 } 2011