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, 2021-2026 Intel Corporation 10 */ 11 12 #include <linux/ieee80211.h> 13 #include <linux/log2.h> 14 #include <net/cfg80211.h> 15 #include <linux/rtnetlink.h> 16 #include "ieee80211_i.h" 17 #include "driver-ops.h" 18 #include "rate.h" 19 #include "wme.h" 20 21 /* give usermode some time for retries in setting up the TDLS session */ 22 #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ) 23 24 void ieee80211_tdls_peer_del_work(struct wiphy *wiphy, struct wiphy_work *wk) 25 { 26 struct ieee80211_sub_if_data *sdata; 27 struct ieee80211_local *local; 28 29 sdata = container_of(wk, struct ieee80211_sub_if_data, 30 u.mgd.tdls_peer_del_work.work); 31 local = sdata->local; 32 33 lockdep_assert_wiphy(local->hw.wiphy); 34 35 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) { 36 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer); 37 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer); 38 eth_zero_addr(sdata->u.mgd.tdls_peer); 39 } 40 } 41 42 static void ieee80211_tdls_add_ext_capab(struct ieee80211_link_data *link, 43 struct sk_buff *skb) 44 { 45 struct ieee80211_sub_if_data *sdata = link->sdata; 46 struct ieee80211_local *local = sdata->local; 47 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 48 bool chan_switch = local->hw.wiphy->features & 49 NL80211_FEATURE_TDLS_CHANNEL_SWITCH; 50 bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) && 51 !ifmgd->tdls_wider_bw_prohibited; 52 bool buffer_sta = ieee80211_hw_check(&local->hw, 53 SUPPORTS_TDLS_BUFFER_STA); 54 struct ieee80211_supported_band *sband = ieee80211_get_link_sband(link); 55 bool vht = sband && sband->vht_cap.vht_supported; 56 u8 *pos = skb_put(skb, 10); 57 58 *pos++ = WLAN_EID_EXT_CAPABILITY; 59 *pos++ = 8; /* len */ 60 *pos++ = 0x0; 61 *pos++ = 0x0; 62 *pos++ = 0x0; 63 *pos++ = (chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0) | 64 (buffer_sta ? WLAN_EXT_CAPA4_TDLS_BUFFER_STA : 0); 65 *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED; 66 *pos++ = 0; 67 *pos++ = 0; 68 *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0; 69 } 70 71 static u8 72 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata, 73 struct sk_buff *skb, u16 start, u16 end, 74 u16 spacing) 75 { 76 u8 subband_cnt = 0, ch_cnt = 0; 77 struct ieee80211_channel *ch; 78 struct cfg80211_chan_def chandef; 79 int i, subband_start; 80 struct wiphy *wiphy = sdata->local->hw.wiphy; 81 82 for (i = start; i <= end; i += spacing) { 83 if (!ch_cnt) 84 subband_start = i; 85 86 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i); 87 if (ch) { 88 /* we will be active on the channel */ 89 cfg80211_chandef_create(&chandef, ch, 90 NL80211_CHAN_NO_HT); 91 if (cfg80211_reg_can_beacon_relax(wiphy, &chandef, 92 sdata->wdev.iftype)) { 93 ch_cnt++; 94 /* 95 * check if the next channel is also part of 96 * this allowed range 97 */ 98 continue; 99 } 100 } 101 102 /* 103 * we've reached the end of a range, with allowed channels 104 * found 105 */ 106 if (ch_cnt) { 107 u8 *pos = skb_put(skb, 2); 108 *pos++ = ieee80211_frequency_to_channel(subband_start); 109 *pos++ = ch_cnt; 110 111 subband_cnt++; 112 ch_cnt = 0; 113 } 114 } 115 116 /* all channels in the requested range are allowed - add them here */ 117 if (ch_cnt) { 118 u8 *pos = skb_put(skb, 2); 119 *pos++ = ieee80211_frequency_to_channel(subband_start); 120 *pos++ = ch_cnt; 121 122 subband_cnt++; 123 } 124 125 return subband_cnt; 126 } 127 128 static void 129 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata, 130 struct sk_buff *skb) 131 { 132 /* 133 * Add possible channels for TDLS. These are channels that are allowed 134 * to be active. 135 */ 136 u8 subband_cnt; 137 u8 *pos = skb_put(skb, 2); 138 139 *pos++ = WLAN_EID_SUPPORTED_CHANNELS; 140 141 /* 142 * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as 143 * this doesn't happen in real world scenarios. 144 */ 145 146 /* 2GHz, with 5MHz spacing */ 147 subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5); 148 149 /* 5GHz, with 20MHz spacing */ 150 subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20); 151 152 /* length */ 153 *pos = 2 * subband_cnt; 154 } 155 156 static void ieee80211_tdls_add_oper_classes(struct ieee80211_link_data *link, 157 struct sk_buff *skb) 158 { 159 u8 *pos; 160 u8 op_class; 161 162 if (!ieee80211_chandef_to_operating_class(&link->conf->chanreq.oper, 163 &op_class)) 164 return; 165 166 pos = skb_put(skb, 4); 167 *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES; 168 *pos++ = 2; /* len */ 169 170 *pos++ = op_class; 171 *pos++ = op_class; /* give current operating class as alternate too */ 172 } 173 174 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb) 175 { 176 u8 *pos = skb_put(skb, 3); 177 178 *pos++ = WLAN_EID_BSS_COEX_2040; 179 *pos++ = 1; /* len */ 180 181 *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST; 182 } 183 184 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_link_data *link, 185 u16 status_code) 186 { 187 struct ieee80211_supported_band *sband; 188 189 /* The capability will be 0 when sending a failure code */ 190 if (status_code != 0) 191 return 0; 192 193 sband = ieee80211_get_link_sband(link); 194 195 if (sband && sband->band == NL80211_BAND_2GHZ) { 196 return WLAN_CAPABILITY_SHORT_SLOT_TIME | 197 WLAN_CAPABILITY_SHORT_PREAMBLE; 198 } 199 200 return 0; 201 } 202 203 static void ieee80211_tdls_add_link_ie(struct ieee80211_link_data *link, 204 struct sk_buff *skb, const u8 *peer, 205 bool initiator) 206 { 207 struct ieee80211_sub_if_data *sdata = link->sdata; 208 struct ieee80211_tdls_lnkie *lnkid; 209 const u8 *init_addr, *rsp_addr; 210 211 if (initiator) { 212 init_addr = sdata->vif.addr; 213 rsp_addr = peer; 214 } else { 215 init_addr = peer; 216 rsp_addr = sdata->vif.addr; 217 } 218 219 lnkid = skb_put(skb, sizeof(struct ieee80211_tdls_lnkie)); 220 221 lnkid->ie_type = WLAN_EID_LINK_ID; 222 lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2; 223 224 memcpy(lnkid->bssid, link->u.mgd.bssid, ETH_ALEN); 225 memcpy(lnkid->init_sta, init_addr, ETH_ALEN); 226 memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN); 227 } 228 229 static void 230 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 231 { 232 u8 *pos = skb_put(skb, 4); 233 234 *pos++ = WLAN_EID_AID; 235 *pos++ = 2; /* len */ 236 put_unaligned_le16(sdata->vif.cfg.aid, pos); 237 } 238 239 /* translate numbering in the WMM parameter IE to the mac80211 notation */ 240 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac) 241 { 242 switch (ac) { 243 default: 244 WARN_ON_ONCE(1); 245 fallthrough; 246 case 0: 247 return IEEE80211_AC_BE; 248 case 1: 249 return IEEE80211_AC_BK; 250 case 2: 251 return IEEE80211_AC_VI; 252 case 3: 253 return IEEE80211_AC_VO; 254 } 255 } 256 257 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci) 258 { 259 u8 ret; 260 261 ret = aifsn & 0x0f; 262 if (acm) 263 ret |= 0x10; 264 ret |= (aci << 5) & 0x60; 265 return ret; 266 } 267 268 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max) 269 { 270 return ((ilog2(cw_min + 1) << 0x0) & 0x0f) | 271 ((ilog2(cw_max + 1) << 0x4) & 0xf0); 272 } 273 274 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata, 275 struct sk_buff *skb) 276 { 277 struct ieee80211_wmm_param_ie *wmm; 278 struct ieee80211_tx_queue_params *txq; 279 int i; 280 281 wmm = skb_put_zero(skb, sizeof(*wmm)); 282 283 wmm->element_id = WLAN_EID_VENDOR_SPECIFIC; 284 wmm->len = sizeof(*wmm) - 2; 285 286 wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */ 287 wmm->oui[1] = 0x50; 288 wmm->oui[2] = 0xf2; 289 wmm->oui_type = 2; /* WME */ 290 wmm->oui_subtype = 1; /* WME param */ 291 wmm->version = 1; /* WME ver */ 292 wmm->qos_info = 0; /* U-APSD not in use */ 293 294 /* 295 * Use the EDCA parameters defined for the BSS, or default if the AP 296 * doesn't support it, as mandated by 802.11-2012 section 10.22.4 297 */ 298 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 299 txq = &sdata->deflink.tx_conf[ieee80211_ac_from_wmm(i)]; 300 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs, 301 txq->acm, i); 302 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max); 303 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop); 304 } 305 } 306 307 static void 308 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata, 309 struct sta_info *sta) 310 { 311 /* IEEE802.11ac-2013 Table E-4 */ 312 static const u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 }; 313 struct cfg80211_chan_def uc = sta->tdls_chandef; 314 enum nl80211_chan_width max_width = 315 ieee80211_sta_cap_chan_bw(&sta->deflink); 316 int i; 317 318 /* only support upgrading non-narrow channels up to 80Mhz */ 319 if (max_width == NL80211_CHAN_WIDTH_5 || 320 max_width == NL80211_CHAN_WIDTH_10) 321 return; 322 323 if (max_width > NL80211_CHAN_WIDTH_80) 324 max_width = NL80211_CHAN_WIDTH_80; 325 326 if (uc.width >= max_width) 327 return; 328 /* 329 * Channel usage constrains in the IEEE802.11ac-2013 specification only 330 * allow expanding a 20MHz channel to 80MHz in a single way. In 331 * addition, there are no 40MHz allowed channels that are not part of 332 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here). 333 */ 334 for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++) 335 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) { 336 uc.center_freq1 = centers_80mhz[i]; 337 uc.center_freq2 = 0; 338 uc.width = NL80211_CHAN_WIDTH_80; 339 break; 340 } 341 342 if (!uc.center_freq1) 343 return; 344 345 /* proceed to downgrade the chandef until usable or the same as AP BW */ 346 while (uc.width > max_width || 347 (uc.width > sta->tdls_chandef.width && 348 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc, 349 sdata->wdev.iftype))) 350 ieee80211_chandef_downgrade(&uc, NULL); 351 352 if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) { 353 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n", 354 sta->tdls_chandef.width, uc.width); 355 356 /* 357 * the station is not yet authorized when BW upgrade is done, 358 * locking is not required 359 */ 360 sta->tdls_chandef = uc; 361 } 362 } 363 364 static void 365 ieee80211_tdls_add_setup_start_ies(struct ieee80211_link_data *link, 366 struct sk_buff *skb, const u8 *peer, 367 u8 action_code, bool initiator, 368 const u8 *extra_ies, size_t extra_ies_len) 369 { 370 struct ieee80211_sub_if_data *sdata = link->sdata; 371 struct ieee80211_supported_band *sband; 372 struct ieee80211_local *local = sdata->local; 373 struct ieee80211_sta_ht_cap ht_cap; 374 struct ieee80211_sta_vht_cap vht_cap; 375 const struct ieee80211_sta_he_cap *he_cap; 376 const struct ieee80211_sta_eht_cap *eht_cap; 377 struct sta_info *sta = NULL; 378 size_t offset = 0, noffset; 379 u8 *pos; 380 381 sband = ieee80211_get_link_sband(link); 382 if (WARN_ON_ONCE(!sband)) 383 return; 384 385 ieee80211_put_srates_elem(skb, sband, 0, 0, WLAN_EID_SUPP_RATES); 386 ieee80211_put_srates_elem(skb, sband, 0, 0, WLAN_EID_EXT_SUPP_RATES); 387 ieee80211_tdls_add_supp_channels(sdata, skb); 388 389 /* add any custom IEs that go before Extended Capabilities */ 390 if (extra_ies_len) { 391 static const u8 before_ext_cap[] = { 392 WLAN_EID_SUPP_RATES, 393 WLAN_EID_COUNTRY, 394 WLAN_EID_EXT_SUPP_RATES, 395 WLAN_EID_SUPPORTED_CHANNELS, 396 WLAN_EID_RSN, 397 }; 398 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 399 before_ext_cap, 400 ARRAY_SIZE(before_ext_cap), 401 offset); 402 skb_put_data(skb, extra_ies + offset, noffset - offset); 403 offset = noffset; 404 } 405 406 ieee80211_tdls_add_ext_capab(link, skb); 407 408 /* add the QoS element if we support it */ 409 if (local->hw.queues >= IEEE80211_NUM_ACS && 410 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES) 411 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */ 412 413 /* add any custom IEs that go before HT capabilities */ 414 if (extra_ies_len) { 415 static const u8 before_ht_cap[] = { 416 WLAN_EID_SUPP_RATES, 417 WLAN_EID_COUNTRY, 418 WLAN_EID_EXT_SUPP_RATES, 419 WLAN_EID_SUPPORTED_CHANNELS, 420 WLAN_EID_RSN, 421 WLAN_EID_EXT_CAPABILITY, 422 WLAN_EID_QOS_CAPA, 423 WLAN_EID_FAST_BSS_TRANSITION, 424 WLAN_EID_TIMEOUT_INTERVAL, 425 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 426 }; 427 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 428 before_ht_cap, 429 ARRAY_SIZE(before_ht_cap), 430 offset); 431 skb_put_data(skb, extra_ies + offset, noffset - offset); 432 offset = noffset; 433 } 434 435 /* we should have the peer STA if we're already responding */ 436 if (action_code == WLAN_TDLS_SETUP_RESPONSE) { 437 sta = sta_info_get(sdata, peer); 438 if (WARN_ON_ONCE(!sta)) 439 return; 440 441 sta->tdls_chandef = link->conf->chanreq.oper; 442 } 443 444 ieee80211_tdls_add_oper_classes(link, skb); 445 446 /* 447 * with TDLS we can switch channels, and HT-caps are not necessarily 448 * the same on all bands. The specification limits the setup to a 449 * single HT-cap, so use the current band for now. 450 */ 451 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 452 453 if ((action_code == WLAN_TDLS_SETUP_REQUEST || 454 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && 455 ht_cap.ht_supported) { 456 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 457 458 /* disable SMPS in TDLS initiator */ 459 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED 460 << IEEE80211_HT_CAP_SM_PS_SHIFT; 461 462 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 463 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 464 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && 465 ht_cap.ht_supported && sta->sta.deflink.ht_cap.ht_supported) { 466 /* the peer caps are already intersected with our own */ 467 memcpy(&ht_cap, &sta->sta.deflink.ht_cap, sizeof(ht_cap)); 468 469 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 470 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 471 } 472 473 if (ht_cap.ht_supported && 474 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 475 ieee80211_tdls_add_bss_coex_ie(skb); 476 477 ieee80211_tdls_add_link_ie(link, skb, peer, initiator); 478 479 /* add any custom IEs that go before VHT capabilities */ 480 if (extra_ies_len) { 481 static const u8 before_vht_cap[] = { 482 WLAN_EID_SUPP_RATES, 483 WLAN_EID_COUNTRY, 484 WLAN_EID_EXT_SUPP_RATES, 485 WLAN_EID_SUPPORTED_CHANNELS, 486 WLAN_EID_RSN, 487 WLAN_EID_EXT_CAPABILITY, 488 WLAN_EID_QOS_CAPA, 489 WLAN_EID_FAST_BSS_TRANSITION, 490 WLAN_EID_TIMEOUT_INTERVAL, 491 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 492 WLAN_EID_MULTI_BAND, 493 }; 494 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 495 before_vht_cap, 496 ARRAY_SIZE(before_vht_cap), 497 offset); 498 skb_put_data(skb, extra_ies + offset, noffset - offset); 499 offset = noffset; 500 } 501 502 /* add AID if VHT, HE or EHT capabilities supported */ 503 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap)); 504 he_cap = ieee80211_get_he_iftype_cap_vif(sband, &sdata->vif); 505 eht_cap = ieee80211_get_eht_iftype_cap_vif(sband, &sdata->vif); 506 if ((vht_cap.vht_supported || he_cap || eht_cap) && 507 (action_code == WLAN_TDLS_SETUP_REQUEST || 508 action_code == WLAN_TDLS_SETUP_RESPONSE)) 509 ieee80211_tdls_add_aid(sdata, skb); 510 511 /* build the VHT-cap similarly to the HT-cap */ 512 if ((action_code == WLAN_TDLS_SETUP_REQUEST || 513 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && 514 vht_cap.vht_supported) { 515 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap); 516 517 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 518 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap); 519 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && 520 vht_cap.vht_supported && sta->sta.deflink.vht_cap.vht_supported) { 521 /* the peer caps are already intersected with our own */ 522 memcpy(&vht_cap, &sta->sta.deflink.vht_cap, sizeof(vht_cap)); 523 524 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 525 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap); 526 527 /* 528 * if both peers support WIDER_BW, we can expand the chandef to 529 * a wider compatible one, up to 80MHz 530 */ 531 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) 532 ieee80211_tdls_chandef_vht_upgrade(sdata, sta); 533 } 534 535 /* add any custom IEs that go before HE capabilities */ 536 if (extra_ies_len) { 537 static const u8 before_he_cap[] = { 538 WLAN_EID_EXTENSION, 539 WLAN_EID_EXT_FILS_REQ_PARAMS, 540 WLAN_EID_AP_CSN, 541 }; 542 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 543 before_he_cap, 544 ARRAY_SIZE(before_he_cap), 545 offset); 546 skb_put_data(skb, extra_ies + offset, noffset - offset); 547 offset = noffset; 548 } 549 550 /* build the HE-cap from sband */ 551 if (action_code == WLAN_TDLS_SETUP_REQUEST || 552 action_code == WLAN_TDLS_SETUP_RESPONSE || 553 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) { 554 ieee80211_put_he_cap(skb, sdata, sband, NULL); 555 556 /* Build HE 6Ghz capa IE from sband */ 557 if (sband->band == NL80211_BAND_6GHZ) 558 ieee80211_put_he_6ghz_cap(skb, sdata, link->smps_mode); 559 } 560 561 /* add any custom IEs that go before EHT capabilities */ 562 if (extra_ies_len) { 563 static const u8 before_he_cap[] = { 564 WLAN_EID_EXTENSION, 565 WLAN_EID_EXT_FILS_REQ_PARAMS, 566 WLAN_EID_AP_CSN, 567 }; 568 569 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 570 before_he_cap, 571 ARRAY_SIZE(before_he_cap), 572 offset); 573 skb_put_data(skb, extra_ies + offset, noffset - offset); 574 offset = noffset; 575 } 576 577 /* build the EHT-cap from sband */ 578 if (action_code == WLAN_TDLS_SETUP_REQUEST || 579 action_code == WLAN_TDLS_SETUP_RESPONSE || 580 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) 581 ieee80211_put_eht_cap(skb, sdata, sband, NULL); 582 583 /* add any remaining IEs */ 584 if (extra_ies_len) { 585 noffset = extra_ies_len; 586 skb_put_data(skb, extra_ies + offset, noffset - offset); 587 } 588 589 } 590 591 static void 592 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_link_data *link, 593 struct sk_buff *skb, const u8 *peer, 594 bool initiator, const u8 *extra_ies, 595 size_t extra_ies_len) 596 { 597 struct ieee80211_sub_if_data *sdata = link->sdata; 598 struct ieee80211_local *local = sdata->local; 599 size_t offset = 0, noffset; 600 struct sta_info *sta, *ap_sta; 601 struct ieee80211_supported_band *sband; 602 u8 *pos; 603 604 sband = ieee80211_get_link_sband(link); 605 if (WARN_ON_ONCE(!sband)) 606 return; 607 608 sta = sta_info_get(sdata, peer); 609 ap_sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 610 611 if (WARN_ON_ONCE(!sta || !ap_sta)) 612 return; 613 614 sta->tdls_chandef = link->conf->chanreq.oper; 615 616 /* add any custom IEs that go before the QoS IE */ 617 if (extra_ies_len) { 618 static const u8 before_qos[] = { 619 WLAN_EID_RSN, 620 }; 621 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 622 before_qos, 623 ARRAY_SIZE(before_qos), 624 offset); 625 skb_put_data(skb, extra_ies + offset, noffset - offset); 626 offset = noffset; 627 } 628 629 /* add the QoS param IE if both the peer and we support it */ 630 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme) 631 ieee80211_tdls_add_wmm_param_ie(sdata, skb); 632 633 /* add any custom IEs that go before HT operation */ 634 if (extra_ies_len) { 635 static const u8 before_ht_op[] = { 636 WLAN_EID_RSN, 637 WLAN_EID_QOS_CAPA, 638 WLAN_EID_FAST_BSS_TRANSITION, 639 WLAN_EID_TIMEOUT_INTERVAL, 640 }; 641 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 642 before_ht_op, 643 ARRAY_SIZE(before_ht_op), 644 offset); 645 skb_put_data(skb, extra_ies + offset, noffset - offset); 646 offset = noffset; 647 } 648 649 /* 650 * if HT support is only added in TDLS, we need an HT-operation IE. 651 * add the IE as required by IEEE802.11-2012 9.23.3.2. 652 */ 653 if (!ap_sta->sta.deflink.ht_cap.ht_supported && sta->sta.deflink.ht_cap.ht_supported) { 654 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | 655 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | 656 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; 657 658 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation)); 659 ieee80211_ie_build_ht_oper(pos, &sta->sta.deflink.ht_cap, 660 &link->conf->chanreq.oper, prot, 661 true); 662 } 663 664 ieee80211_tdls_add_link_ie(link, skb, peer, initiator); 665 666 /* only include VHT-operation if not on the 2.4GHz band */ 667 if (sband->band != NL80211_BAND_2GHZ && 668 sta->sta.deflink.vht_cap.vht_supported) { 669 /* 670 * if both peers support WIDER_BW, we can expand the chandef to 671 * a wider compatible one, up to 80MHz 672 */ 673 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) 674 ieee80211_tdls_chandef_vht_upgrade(sdata, sta); 675 676 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation)); 677 ieee80211_ie_build_vht_oper(pos, &sta->sta.deflink.vht_cap, 678 &sta->tdls_chandef); 679 } 680 681 /* add any remaining IEs */ 682 if (extra_ies_len) { 683 noffset = extra_ies_len; 684 skb_put_data(skb, extra_ies + offset, noffset - offset); 685 } 686 } 687 688 static void 689 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_link_data *link, 690 struct sk_buff *skb, const u8 *peer, 691 bool initiator, const u8 *extra_ies, 692 size_t extra_ies_len, u8 oper_class, 693 struct cfg80211_chan_def *chandef) 694 { 695 struct ieee80211_tdls_data *tf; 696 size_t offset = 0, noffset; 697 698 if (WARN_ON_ONCE(!chandef)) 699 return; 700 701 tf = (void *)skb->data; 702 tf->u.chan_switch_req.target_channel = 703 ieee80211_frequency_to_channel(chandef->chan->center_freq); 704 tf->u.chan_switch_req.oper_class = oper_class; 705 706 if (extra_ies_len) { 707 static const u8 before_lnkie[] = { 708 WLAN_EID_SECONDARY_CHANNEL_OFFSET, 709 }; 710 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 711 before_lnkie, 712 ARRAY_SIZE(before_lnkie), 713 offset); 714 skb_put_data(skb, extra_ies + offset, noffset - offset); 715 offset = noffset; 716 } 717 718 ieee80211_tdls_add_link_ie(link, skb, peer, initiator); 719 720 /* add any remaining IEs */ 721 if (extra_ies_len) { 722 noffset = extra_ies_len; 723 skb_put_data(skb, extra_ies + offset, noffset - offset); 724 } 725 } 726 727 static void 728 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_link_data *link, 729 struct sk_buff *skb, const u8 *peer, 730 u16 status_code, bool initiator, 731 const u8 *extra_ies, 732 size_t extra_ies_len) 733 { 734 if (status_code == 0) 735 ieee80211_tdls_add_link_ie(link, skb, peer, initiator); 736 737 if (extra_ies_len) 738 skb_put_data(skb, extra_ies, extra_ies_len); 739 } 740 741 static void ieee80211_tdls_add_ies(struct ieee80211_link_data *link, 742 struct sk_buff *skb, const u8 *peer, 743 u8 action_code, u16 status_code, 744 bool initiator, const u8 *extra_ies, 745 size_t extra_ies_len, u8 oper_class, 746 struct cfg80211_chan_def *chandef) 747 { 748 switch (action_code) { 749 case WLAN_TDLS_SETUP_REQUEST: 750 case WLAN_TDLS_SETUP_RESPONSE: 751 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 752 if (status_code == 0) 753 ieee80211_tdls_add_setup_start_ies(link, 754 skb, peer, 755 action_code, 756 initiator, 757 extra_ies, 758 extra_ies_len); 759 break; 760 case WLAN_TDLS_SETUP_CONFIRM: 761 if (status_code == 0) 762 ieee80211_tdls_add_setup_cfm_ies(link, skb, peer, 763 initiator, extra_ies, 764 extra_ies_len); 765 break; 766 case WLAN_TDLS_TEARDOWN: 767 case WLAN_TDLS_DISCOVERY_REQUEST: 768 if (extra_ies_len) 769 skb_put_data(skb, extra_ies, extra_ies_len); 770 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN) 771 ieee80211_tdls_add_link_ie(link, skb, 772 peer, initiator); 773 break; 774 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 775 ieee80211_tdls_add_chan_switch_req_ies(link, skb, peer, 776 initiator, extra_ies, 777 extra_ies_len, 778 oper_class, chandef); 779 break; 780 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 781 ieee80211_tdls_add_chan_switch_resp_ies(link, skb, peer, 782 status_code, 783 initiator, extra_ies, 784 extra_ies_len); 785 break; 786 } 787 788 } 789 790 static int 791 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev, 792 struct ieee80211_link_data *link, 793 const u8 *peer, u8 action_code, u8 dialog_token, 794 u16 status_code, struct sk_buff *skb) 795 { 796 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 797 struct ieee80211_tdls_data *tf; 798 799 tf = skb_put(skb, offsetof(struct ieee80211_tdls_data, u)); 800 801 memcpy(tf->da, peer, ETH_ALEN); 802 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN); 803 tf->ether_type = cpu_to_be16(ETH_P_TDLS); 804 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE; 805 806 /* network header is after the ethernet header */ 807 skb_set_network_header(skb, ETH_HLEN); 808 809 switch (action_code) { 810 case WLAN_TDLS_SETUP_REQUEST: 811 tf->category = WLAN_CATEGORY_TDLS; 812 tf->action_code = WLAN_TDLS_SETUP_REQUEST; 813 814 skb_put(skb, sizeof(tf->u.setup_req)); 815 tf->u.setup_req.dialog_token = dialog_token; 816 tf->u.setup_req.capability = 817 cpu_to_le16(ieee80211_get_tdls_sta_capab(link, 818 status_code)); 819 break; 820 case WLAN_TDLS_SETUP_RESPONSE: 821 tf->category = WLAN_CATEGORY_TDLS; 822 tf->action_code = WLAN_TDLS_SETUP_RESPONSE; 823 824 skb_put(skb, sizeof(tf->u.setup_resp)); 825 tf->u.setup_resp.status_code = cpu_to_le16(status_code); 826 tf->u.setup_resp.dialog_token = dialog_token; 827 tf->u.setup_resp.capability = 828 cpu_to_le16(ieee80211_get_tdls_sta_capab(link, 829 status_code)); 830 break; 831 case WLAN_TDLS_SETUP_CONFIRM: 832 tf->category = WLAN_CATEGORY_TDLS; 833 tf->action_code = WLAN_TDLS_SETUP_CONFIRM; 834 835 skb_put(skb, sizeof(tf->u.setup_cfm)); 836 tf->u.setup_cfm.status_code = cpu_to_le16(status_code); 837 tf->u.setup_cfm.dialog_token = dialog_token; 838 break; 839 case WLAN_TDLS_TEARDOWN: 840 tf->category = WLAN_CATEGORY_TDLS; 841 tf->action_code = WLAN_TDLS_TEARDOWN; 842 843 skb_put(skb, sizeof(tf->u.teardown)); 844 tf->u.teardown.reason_code = cpu_to_le16(status_code); 845 break; 846 case WLAN_TDLS_DISCOVERY_REQUEST: 847 tf->category = WLAN_CATEGORY_TDLS; 848 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST; 849 850 skb_put(skb, sizeof(tf->u.discover_req)); 851 tf->u.discover_req.dialog_token = dialog_token; 852 break; 853 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 854 tf->category = WLAN_CATEGORY_TDLS; 855 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 856 857 skb_put(skb, sizeof(tf->u.chan_switch_req)); 858 break; 859 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 860 tf->category = WLAN_CATEGORY_TDLS; 861 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 862 863 skb_put(skb, sizeof(tf->u.chan_switch_resp)); 864 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code); 865 break; 866 default: 867 return -EINVAL; 868 } 869 870 return 0; 871 } 872 873 static int 874 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev, 875 const u8 *peer, struct ieee80211_link_data *link, 876 u8 action_code, u8 dialog_token, 877 u16 status_code, struct sk_buff *skb) 878 { 879 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 880 struct ieee80211_mgmt *mgmt; 881 882 if (action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES) 883 return -EINVAL; 884 885 mgmt = skb_put_zero(skb, IEEE80211_MIN_ACTION_SIZE(tdls_discover_resp)); 886 memcpy(mgmt->da, peer, ETH_ALEN); 887 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 888 memcpy(mgmt->bssid, link->u.mgd.bssid, ETH_ALEN); 889 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 890 IEEE80211_STYPE_ACTION); 891 892 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC; 893 mgmt->u.action.action_code = WLAN_PUB_ACTION_TDLS_DISCOVER_RES; 894 895 mgmt->u.action.tdls_discover_resp.dialog_token = dialog_token; 896 mgmt->u.action.tdls_discover_resp.capability = 897 cpu_to_le16(ieee80211_get_tdls_sta_capab(link, 898 status_code)); 899 900 return 0; 901 } 902 903 static struct sk_buff * 904 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata, 905 const u8 *peer, int link_id, 906 u8 action_code, u8 dialog_token, 907 u16 status_code, bool initiator, 908 const u8 *extra_ies, size_t extra_ies_len, 909 u8 oper_class, 910 struct cfg80211_chan_def *chandef) 911 { 912 struct ieee80211_local *local = sdata->local; 913 struct sk_buff *skb; 914 int ret; 915 struct ieee80211_link_data *link; 916 917 link_id = link_id >= 0 ? link_id : 0; 918 rcu_read_lock(); 919 link = rcu_dereference(sdata->link[link_id]); 920 if (WARN_ON(!link)) 921 goto unlock; 922 923 skb = netdev_alloc_skb(sdata->dev, 924 local->hw.extra_tx_headroom + 925 max(sizeof(struct ieee80211_mgmt), 926 sizeof(struct ieee80211_tdls_data)) + 927 50 + /* supported rates */ 928 10 + /* ext capab */ 929 26 + /* max(WMM-info, WMM-param) */ 930 2 + max(sizeof(struct ieee80211_ht_cap), 931 sizeof(struct ieee80211_ht_operation)) + 932 2 + max(sizeof(struct ieee80211_vht_cap), 933 sizeof(struct ieee80211_vht_operation)) + 934 2 + 1 + sizeof(struct ieee80211_he_cap_elem) + 935 sizeof(struct ieee80211_he_mcs_nss_supp) + 936 IEEE80211_HE_PPE_THRES_MAX_LEN + 937 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) + 938 2 + 1 + sizeof(struct ieee80211_eht_cap_elem) + 939 sizeof(struct ieee80211_eht_mcs_nss_supp) + 940 IEEE80211_EHT_PPE_THRES_MAX_LEN + 941 50 + /* supported channels */ 942 3 + /* 40/20 BSS coex */ 943 4 + /* AID */ 944 4 + /* oper classes */ 945 extra_ies_len + 946 sizeof(struct ieee80211_tdls_lnkie)); 947 if (!skb) 948 goto unlock; 949 950 skb_reserve(skb, local->hw.extra_tx_headroom); 951 952 switch (action_code) { 953 case WLAN_TDLS_SETUP_REQUEST: 954 case WLAN_TDLS_SETUP_RESPONSE: 955 case WLAN_TDLS_SETUP_CONFIRM: 956 case WLAN_TDLS_TEARDOWN: 957 case WLAN_TDLS_DISCOVERY_REQUEST: 958 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 959 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 960 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy, 961 sdata->dev, link, peer, 962 action_code, dialog_token, 963 status_code, skb); 964 break; 965 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 966 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev, 967 peer, link, action_code, 968 dialog_token, status_code, 969 skb); 970 break; 971 default: 972 ret = -EOPNOTSUPP; 973 break; 974 } 975 976 if (ret < 0) 977 goto fail; 978 979 ieee80211_tdls_add_ies(link, skb, peer, action_code, status_code, 980 initiator, extra_ies, extra_ies_len, oper_class, 981 chandef); 982 rcu_read_unlock(); 983 return skb; 984 985 fail: 986 dev_kfree_skb(skb); 987 unlock: 988 rcu_read_unlock(); 989 return NULL; 990 } 991 992 static int 993 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev, 994 const u8 *peer, int link_id, 995 u8 action_code, u8 dialog_token, 996 u16 status_code, u32 peer_capability, 997 bool initiator, const u8 *extra_ies, 998 size_t extra_ies_len, u8 oper_class, 999 struct cfg80211_chan_def *chandef) 1000 { 1001 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1002 struct sk_buff *skb = NULL; 1003 struct sta_info *sta; 1004 u32 flags = 0; 1005 int ret = 0; 1006 1007 rcu_read_lock(); 1008 sta = sta_info_get(sdata, peer); 1009 1010 /* infer the initiator if we can, to support old userspace */ 1011 switch (action_code) { 1012 case WLAN_TDLS_SETUP_REQUEST: 1013 if (sta) { 1014 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); 1015 sta->sta.tdls_initiator = false; 1016 } 1017 fallthrough; 1018 case WLAN_TDLS_SETUP_CONFIRM: 1019 case WLAN_TDLS_DISCOVERY_REQUEST: 1020 initiator = true; 1021 break; 1022 case WLAN_TDLS_SETUP_RESPONSE: 1023 /* 1024 * In some testing scenarios, we send a request and response. 1025 * Make the last packet sent take effect for the initiator 1026 * value. 1027 */ 1028 if (sta) { 1029 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); 1030 sta->sta.tdls_initiator = true; 1031 } 1032 fallthrough; 1033 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 1034 initiator = false; 1035 break; 1036 case WLAN_TDLS_TEARDOWN: 1037 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 1038 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 1039 /* any value is ok */ 1040 break; 1041 default: 1042 ret = -EOPNOTSUPP; 1043 break; 1044 } 1045 1046 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR)) 1047 initiator = true; 1048 1049 rcu_read_unlock(); 1050 if (ret < 0) 1051 goto fail; 1052 1053 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, 1054 link_id, action_code, 1055 dialog_token, status_code, 1056 initiator, extra_ies, 1057 extra_ies_len, oper_class, 1058 chandef); 1059 if (!skb) { 1060 ret = -EINVAL; 1061 goto fail; 1062 } 1063 1064 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) { 1065 ieee80211_tx_skb_tid(sdata, skb, 7, link_id); 1066 return 0; 1067 } 1068 1069 /* 1070 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise 1071 * we should default to AC_VI. 1072 */ 1073 switch (action_code) { 1074 case WLAN_TDLS_SETUP_REQUEST: 1075 case WLAN_TDLS_SETUP_RESPONSE: 1076 skb->priority = 256 + 2; 1077 break; 1078 default: 1079 skb->priority = 256 + 5; 1080 break; 1081 } 1082 1083 /* 1084 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress. 1085 * Later, if no ACK is returned from peer, we will re-send the teardown 1086 * packet through the AP. 1087 */ 1088 if ((action_code == WLAN_TDLS_TEARDOWN) && 1089 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) { 1090 bool try_resend; /* Should we keep skb for possible resend */ 1091 1092 /* If not sending directly to peer - no point in keeping skb */ 1093 rcu_read_lock(); 1094 sta = sta_info_get(sdata, peer); 1095 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1096 rcu_read_unlock(); 1097 1098 spin_lock_bh(&sdata->u.mgd.teardown_lock); 1099 if (try_resend && !sdata->u.mgd.teardown_skb) { 1100 /* Mark it as requiring TX status callback */ 1101 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | 1102 IEEE80211_TX_INTFL_MLME_CONN_TX; 1103 1104 /* 1105 * skb is copied since mac80211 will later set 1106 * properties that might not be the same as the AP, 1107 * such as encryption, QoS, addresses, etc. 1108 * 1109 * No problem if skb_copy() fails, so no need to check. 1110 */ 1111 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC); 1112 sdata->u.mgd.orig_teardown_skb = skb; 1113 } 1114 spin_unlock_bh(&sdata->u.mgd.teardown_lock); 1115 } 1116 1117 /* disable bottom halves when entering the Tx path */ 1118 local_bh_disable(); 1119 __ieee80211_subif_start_xmit(skb, dev, flags, 1120 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 1121 local_bh_enable(); 1122 1123 return ret; 1124 1125 fail: 1126 dev_kfree_skb(skb); 1127 return ret; 1128 } 1129 1130 static int 1131 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev, 1132 const u8 *peer, int link_id, 1133 u8 action_code, u8 dialog_token, 1134 u16 status_code, u32 peer_capability, bool initiator, 1135 const u8 *extra_ies, size_t extra_ies_len) 1136 { 1137 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1138 struct ieee80211_local *local = sdata->local; 1139 enum ieee80211_smps_mode smps_mode = 1140 sdata->deflink.u.mgd.driver_smps_mode; 1141 int ret; 1142 1143 /* don't support setup with forced SMPS mode that's not off */ 1144 if (smps_mode != IEEE80211_SMPS_AUTOMATIC && 1145 smps_mode != IEEE80211_SMPS_OFF) { 1146 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n", 1147 smps_mode); 1148 return -EOPNOTSUPP; 1149 } 1150 1151 lockdep_assert_wiphy(local->hw.wiphy); 1152 1153 /* we don't support concurrent TDLS peer setups */ 1154 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) && 1155 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1156 ret = -EBUSY; 1157 goto out_unlock; 1158 } 1159 1160 /* 1161 * make sure we have a STA representing the peer so we drop or buffer 1162 * non-TDLS-setup frames to the peer. We can't send other packets 1163 * during setup through the AP path. 1164 * Allow error packets to be sent - sometimes we don't even add a STA 1165 * before failing the setup. 1166 */ 1167 if (status_code == 0) { 1168 rcu_read_lock(); 1169 if (!sta_info_get(sdata, peer)) { 1170 rcu_read_unlock(); 1171 ret = -ENOLINK; 1172 goto out_unlock; 1173 } 1174 rcu_read_unlock(); 1175 } 1176 1177 ieee80211_flush_queues(local, sdata, false); 1178 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN); 1179 1180 /* we cannot take the mutex while preparing the setup packet */ 1181 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1182 link_id, action_code, 1183 dialog_token, status_code, 1184 peer_capability, initiator, 1185 extra_ies, extra_ies_len, 0, 1186 NULL); 1187 if (ret < 0) { 1188 eth_zero_addr(sdata->u.mgd.tdls_peer); 1189 return ret; 1190 } 1191 1192 wiphy_delayed_work_queue(sdata->local->hw.wiphy, 1193 &sdata->u.mgd.tdls_peer_del_work, 1194 TDLS_PEER_SETUP_TIMEOUT); 1195 return 0; 1196 1197 out_unlock: 1198 return ret; 1199 } 1200 1201 static int 1202 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev, 1203 const u8 *peer, int link_id, 1204 u8 action_code, u8 dialog_token, 1205 u16 status_code, u32 peer_capability, 1206 bool initiator, const u8 *extra_ies, 1207 size_t extra_ies_len) 1208 { 1209 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1210 struct ieee80211_local *local = sdata->local; 1211 struct sta_info *sta; 1212 int ret; 1213 1214 /* 1215 * No packets can be transmitted to the peer via the AP during setup - 1216 * the STA is set as a TDLS peer, but is not authorized. 1217 * During teardown, we prevent direct transmissions by stopping the 1218 * queues and flushing all direct packets. 1219 */ 1220 ieee80211_stop_vif_queues(local, sdata, 1221 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1222 ieee80211_flush_queues(local, sdata, false); 1223 1224 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1225 link_id, action_code, 1226 dialog_token, status_code, 1227 peer_capability, initiator, 1228 extra_ies, extra_ies_len, 0, 1229 NULL); 1230 if (ret < 0) 1231 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n", 1232 ret); 1233 1234 /* 1235 * Remove the STA AUTH flag to force further traffic through the AP. If 1236 * the STA was unreachable, it was already removed. 1237 */ 1238 rcu_read_lock(); 1239 sta = sta_info_get(sdata, peer); 1240 if (sta) 1241 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1242 rcu_read_unlock(); 1243 1244 ieee80211_wake_vif_queues(local, sdata, 1245 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1246 1247 return 0; 1248 } 1249 1250 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev, 1251 const u8 *peer, int link_id, 1252 u8 action_code, u8 dialog_token, u16 status_code, 1253 u32 peer_capability, bool initiator, 1254 const u8 *extra_ies, size_t extra_ies_len) 1255 { 1256 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1257 int ret; 1258 1259 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1260 return -EOPNOTSUPP; 1261 1262 /* make sure we are in managed mode, and associated */ 1263 if (sdata->vif.type != NL80211_IFTYPE_STATION || 1264 !sdata->u.mgd.associated) 1265 return -EINVAL; 1266 1267 switch (action_code) { 1268 case WLAN_TDLS_SETUP_REQUEST: 1269 case WLAN_TDLS_SETUP_RESPONSE: 1270 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, 1271 link_id, action_code, 1272 dialog_token, status_code, 1273 peer_capability, initiator, 1274 extra_ies, extra_ies_len); 1275 break; 1276 case WLAN_TDLS_TEARDOWN: 1277 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, link_id, 1278 action_code, dialog_token, 1279 status_code, 1280 peer_capability, initiator, 1281 extra_ies, extra_ies_len); 1282 break; 1283 case WLAN_TDLS_DISCOVERY_REQUEST: 1284 /* 1285 * Protect the discovery so we can hear the TDLS discovery 1286 * response frame. It is transmitted directly and not buffered 1287 * by the AP. 1288 */ 1289 drv_mgd_protect_tdls_discover(sdata->local, sdata, link_id); 1290 fallthrough; 1291 case WLAN_TDLS_SETUP_CONFIRM: 1292 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 1293 /* no special handling */ 1294 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1295 link_id, action_code, 1296 dialog_token, 1297 status_code, 1298 peer_capability, 1299 initiator, extra_ies, 1300 extra_ies_len, 0, NULL); 1301 break; 1302 default: 1303 ret = -EOPNOTSUPP; 1304 break; 1305 } 1306 1307 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM link_id %d status %d\n", 1308 action_code, peer, link_id, ret); 1309 return ret; 1310 } 1311 1312 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata, 1313 struct sta_info *sta) 1314 { 1315 struct ieee80211_local *local = sdata->local; 1316 struct ieee80211_chanctx_conf *conf; 1317 struct ieee80211_chanctx *ctx; 1318 enum nl80211_chan_width width; 1319 struct ieee80211_supported_band *sband; 1320 1321 lockdep_assert_wiphy(local->hw.wiphy); 1322 1323 conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf, 1324 lockdep_is_held(&local->hw.wiphy->mtx)); 1325 if (conf) { 1326 width = conf->def.width; 1327 sband = local->hw.wiphy->bands[conf->def.chan->band]; 1328 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1329 ieee80211_recalc_chanctx_chantype(local, ctx); 1330 1331 /* if width changed and a peer is given, update its BW */ 1332 if (width != conf->def.width && sta && 1333 test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) { 1334 enum ieee80211_sta_rx_bandwidth bw; 1335 1336 bw = ieee80211_chan_width_to_rx_bw(conf->def.width); 1337 bw = min(bw, ieee80211_sta_cap_rx_bw(&sta->deflink)); 1338 if (bw != sta->sta.deflink.bandwidth) { 1339 sta->sta.deflink.bandwidth = bw; 1340 rate_control_rate_update(local, sband, 1341 &sta->deflink, 1342 IEEE80211_RC_BW_CHANGED); 1343 /* 1344 * if a TDLS peer BW was updated, we need to 1345 * recalc the chandef width again, to get the 1346 * correct chanctx min_def 1347 */ 1348 ieee80211_recalc_chanctx_chantype(local, ctx); 1349 } 1350 } 1351 1352 } 1353 } 1354 1355 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata) 1356 { 1357 struct sta_info *sta; 1358 bool result = false; 1359 1360 rcu_read_lock(); 1361 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 1362 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 1363 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 1364 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) || 1365 !sta->sta.deflink.ht_cap.ht_supported) 1366 continue; 1367 result = true; 1368 break; 1369 } 1370 rcu_read_unlock(); 1371 1372 return result; 1373 } 1374 1375 static void 1376 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata, 1377 struct sta_info *sta) 1378 { 1379 bool tdls_ht; 1380 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | 1381 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | 1382 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; 1383 u16 opmode; 1384 1385 /* Nothing to do if the BSS connection uses (at least) HT */ 1386 if (sdata->deflink.u.mgd.conn.mode >= IEEE80211_CONN_MODE_HT) 1387 return; 1388 1389 tdls_ht = (sta && sta->sta.deflink.ht_cap.ht_supported) || 1390 iee80211_tdls_have_ht_peers(sdata); 1391 1392 opmode = sdata->vif.bss_conf.ht_operation_mode; 1393 1394 if (tdls_ht) 1395 opmode |= protection; 1396 else 1397 opmode &= ~protection; 1398 1399 if (opmode == sdata->vif.bss_conf.ht_operation_mode) 1400 return; 1401 1402 sdata->vif.bss_conf.ht_operation_mode = opmode; 1403 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1404 BSS_CHANGED_HT); 1405 } 1406 1407 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev, 1408 const u8 *peer, enum nl80211_tdls_operation oper) 1409 { 1410 struct sta_info *sta; 1411 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1412 struct ieee80211_local *local = sdata->local; 1413 int ret; 1414 1415 lockdep_assert_wiphy(local->hw.wiphy); 1416 1417 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1418 return -EOPNOTSUPP; 1419 1420 if (sdata->vif.type != NL80211_IFTYPE_STATION || !sdata->vif.cfg.assoc) 1421 return -EINVAL; 1422 1423 switch (oper) { 1424 case NL80211_TDLS_ENABLE_LINK: 1425 case NL80211_TDLS_DISABLE_LINK: 1426 break; 1427 case NL80211_TDLS_TEARDOWN: 1428 case NL80211_TDLS_SETUP: 1429 case NL80211_TDLS_DISCOVERY_REQ: 1430 /* We don't support in-driver setup/teardown/discovery */ 1431 return -EOPNOTSUPP; 1432 } 1433 1434 /* protect possible bss_conf changes and avoid concurrency in 1435 * ieee80211_bss_info_change_notify() 1436 */ 1437 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer); 1438 1439 switch (oper) { 1440 case NL80211_TDLS_ENABLE_LINK: 1441 if (sdata->vif.bss_conf.csa_active) { 1442 tdls_dbg(sdata, "TDLS: disallow link during CSA\n"); 1443 return -EBUSY; 1444 } 1445 1446 sta = sta_info_get(sdata, peer); 1447 if (!sta || !sta->sta.tdls) 1448 return -ENOLINK; 1449 1450 iee80211_tdls_recalc_chanctx(sdata, sta); 1451 iee80211_tdls_recalc_ht_protection(sdata, sta); 1452 1453 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1454 1455 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) || 1456 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)); 1457 break; 1458 case NL80211_TDLS_DISABLE_LINK: 1459 /* 1460 * The teardown message in ieee80211_tdls_mgmt_teardown() was 1461 * created while the queues were stopped, so it might still be 1462 * pending. Before flushing the queues we need to be sure the 1463 * message is handled by the tasklet handling pending messages, 1464 * otherwise we might start destroying the station before 1465 * sending the teardown packet. 1466 * Note that this only forces the tasklet to flush pendings - 1467 * not to stop the tasklet from rescheduling itself. 1468 */ 1469 tasklet_kill(&local->tx_pending_tasklet); 1470 /* flush a potentially queued teardown packet */ 1471 ieee80211_flush_queues(local, sdata, false); 1472 1473 ret = sta_info_destroy_addr(sdata, peer); 1474 1475 iee80211_tdls_recalc_ht_protection(sdata, NULL); 1476 1477 iee80211_tdls_recalc_chanctx(sdata, NULL); 1478 if (ret) 1479 return ret; 1480 break; 1481 default: 1482 return -EOPNOTSUPP; 1483 } 1484 1485 if (ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1486 wiphy_delayed_work_cancel(sdata->local->hw.wiphy, 1487 &sdata->u.mgd.tdls_peer_del_work); 1488 eth_zero_addr(sdata->u.mgd.tdls_peer); 1489 } 1490 1491 wiphy_work_queue(sdata->local->hw.wiphy, 1492 &sdata->deflink.u.mgd.request_smps_work); 1493 1494 return 0; 1495 } 1496 1497 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer, 1498 enum nl80211_tdls_operation oper, 1499 u16 reason_code, gfp_t gfp) 1500 { 1501 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1502 1503 if (vif->type != NL80211_IFTYPE_STATION || !vif->cfg.assoc) { 1504 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n", 1505 oper); 1506 return; 1507 } 1508 1509 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp); 1510 } 1511 EXPORT_SYMBOL(ieee80211_tdls_oper_request); 1512 1513 static void 1514 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout) 1515 { 1516 struct ieee80211_ch_switch_timing *ch_sw; 1517 1518 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING; 1519 *buf++ = sizeof(struct ieee80211_ch_switch_timing); 1520 1521 ch_sw = (void *)buf; 1522 ch_sw->switch_time = cpu_to_le16(switch_time); 1523 ch_sw->switch_timeout = cpu_to_le16(switch_timeout); 1524 } 1525 1526 /* find switch timing IE in SKB ready for Tx */ 1527 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb) 1528 { 1529 struct ieee80211_tdls_data *tf; 1530 const u8 *ie_start; 1531 1532 /* 1533 * Get the offset for the new location of the switch timing IE. 1534 * The SKB network header will now point to the "payload_type" 1535 * element of the TDLS data frame struct. 1536 */ 1537 tf = container_of(skb->data + skb_network_offset(skb), 1538 struct ieee80211_tdls_data, payload_type); 1539 ie_start = tf->u.chan_switch_req.variable; 1540 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start, 1541 skb->len - (ie_start - skb->data)); 1542 } 1543 1544 static struct sk_buff * 1545 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class, 1546 struct cfg80211_chan_def *chandef, 1547 u32 *ch_sw_tm_ie_offset) 1548 { 1549 struct ieee80211_sub_if_data *sdata = sta->sdata; 1550 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) + 1551 2 + sizeof(struct ieee80211_ch_switch_timing)]; 1552 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing); 1553 u8 *pos = extra_ies; 1554 struct sk_buff *skb; 1555 int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0; 1556 1557 /* 1558 * if chandef points to a wide channel add a Secondary-Channel 1559 * Offset information element 1560 */ 1561 if (chandef->width == NL80211_CHAN_WIDTH_40) { 1562 struct ieee80211_sec_chan_offs_ie *sec_chan_ie; 1563 bool ht40plus; 1564 1565 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; 1566 *pos++ = sizeof(*sec_chan_ie); 1567 sec_chan_ie = (void *)pos; 1568 1569 ht40plus = cfg80211_get_chandef_type(chandef) == 1570 NL80211_CHAN_HT40PLUS; 1571 sec_chan_ie->sec_chan_offs = ht40plus ? 1572 IEEE80211_HT_PARAM_CHA_SEC_ABOVE : 1573 IEEE80211_HT_PARAM_CHA_SEC_BELOW; 1574 pos += sizeof(*sec_chan_ie); 1575 1576 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie); 1577 } 1578 1579 /* just set the values to 0, this is a template */ 1580 iee80211_tdls_add_ch_switch_timing(pos, 0, 0); 1581 1582 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1583 link_id, 1584 WLAN_TDLS_CHANNEL_SWITCH_REQUEST, 1585 0, 0, !sta->sta.tdls_initiator, 1586 extra_ies, extra_ies_len, 1587 oper_class, chandef); 1588 if (!skb) 1589 return NULL; 1590 1591 skb = ieee80211_build_data_template(sdata, skb, 0); 1592 if (IS_ERR(skb)) { 1593 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n"); 1594 return NULL; 1595 } 1596 1597 if (ch_sw_tm_ie_offset) { 1598 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1599 1600 if (!tm_ie) { 1601 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n"); 1602 dev_kfree_skb_any(skb); 1603 return NULL; 1604 } 1605 1606 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1607 } 1608 1609 tdls_dbg(sdata, 1610 "TDLS channel switch request template for %pM ch %d width %d\n", 1611 sta->sta.addr, chandef->chan->center_freq, chandef->width); 1612 return skb; 1613 } 1614 1615 int 1616 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev, 1617 const u8 *addr, u8 oper_class, 1618 struct cfg80211_chan_def *chandef) 1619 { 1620 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1621 struct ieee80211_local *local = sdata->local; 1622 struct sta_info *sta; 1623 struct sk_buff *skb = NULL; 1624 u32 ch_sw_tm_ie; 1625 int ret; 1626 1627 lockdep_assert_wiphy(local->hw.wiphy); 1628 1629 if (chandef->chan->freq_offset) 1630 /* this may work, but is untested */ 1631 return -EOPNOTSUPP; 1632 1633 sta = sta_info_get(sdata, addr); 1634 if (!sta) { 1635 tdls_dbg(sdata, 1636 "Invalid TDLS peer %pM for channel switch request\n", 1637 addr); 1638 ret = -ENOENT; 1639 goto out; 1640 } 1641 1642 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) { 1643 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n", 1644 addr); 1645 ret = -EOPNOTSUPP; 1646 goto out; 1647 } 1648 1649 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef, 1650 &ch_sw_tm_ie); 1651 if (!skb) { 1652 ret = -ENOENT; 1653 goto out; 1654 } 1655 1656 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class, 1657 chandef, skb, ch_sw_tm_ie); 1658 if (!ret) 1659 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1660 1661 out: 1662 dev_kfree_skb_any(skb); 1663 return ret; 1664 } 1665 1666 void 1667 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy, 1668 struct net_device *dev, 1669 const u8 *addr) 1670 { 1671 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1672 struct ieee80211_local *local = sdata->local; 1673 struct sta_info *sta; 1674 1675 lockdep_assert_wiphy(local->hw.wiphy); 1676 1677 sta = sta_info_get(sdata, addr); 1678 if (!sta) { 1679 tdls_dbg(sdata, 1680 "Invalid TDLS peer %pM for channel switch cancel\n", 1681 addr); 1682 return; 1683 } 1684 1685 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) { 1686 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n", 1687 addr); 1688 return; 1689 } 1690 1691 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta); 1692 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1693 } 1694 1695 static struct sk_buff * 1696 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta, 1697 u32 *ch_sw_tm_ie_offset) 1698 { 1699 struct ieee80211_sub_if_data *sdata = sta->sdata; 1700 struct sk_buff *skb; 1701 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)]; 1702 int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0; 1703 1704 /* initial timing are always zero in the template */ 1705 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0); 1706 1707 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1708 link_id, 1709 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE, 1710 0, 0, !sta->sta.tdls_initiator, 1711 extra_ies, sizeof(extra_ies), 0, NULL); 1712 if (!skb) 1713 return NULL; 1714 1715 skb = ieee80211_build_data_template(sdata, skb, 0); 1716 if (IS_ERR(skb)) { 1717 tdls_dbg(sdata, 1718 "Failed building TDLS channel switch resp frame\n"); 1719 return NULL; 1720 } 1721 1722 if (ch_sw_tm_ie_offset) { 1723 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1724 1725 if (!tm_ie) { 1726 tdls_dbg(sdata, 1727 "No switch timing IE in TDLS switch resp\n"); 1728 dev_kfree_skb_any(skb); 1729 return NULL; 1730 } 1731 1732 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1733 } 1734 1735 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n", 1736 sta->sta.addr); 1737 return skb; 1738 } 1739 1740 static int 1741 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata, 1742 struct sk_buff *skb) 1743 { 1744 struct ieee80211_local *local = sdata->local; 1745 struct ieee802_11_elems *elems = NULL; 1746 struct sta_info *sta; 1747 struct ieee80211_tdls_data *tf = (void *)skb->data; 1748 bool local_initiator; 1749 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1750 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable); 1751 struct ieee80211_tdls_ch_sw_params params = {}; 1752 int ret; 1753 1754 lockdep_assert_wiphy(local->hw.wiphy); 1755 1756 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 1757 params.timestamp = rx_status->device_timestamp; 1758 1759 if (skb->len < baselen) { 1760 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n", 1761 skb->len); 1762 return -EINVAL; 1763 } 1764 1765 sta = sta_info_get(sdata, tf->sa); 1766 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1767 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1768 tf->sa); 1769 ret = -EINVAL; 1770 goto out; 1771 } 1772 1773 params.sta = &sta->sta; 1774 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code); 1775 if (params.status != 0) { 1776 ret = 0; 1777 goto call_drv; 1778 } 1779 1780 elems = ieee802_11_parse_elems(tf->u.chan_switch_resp.variable, 1781 skb->len - baselen, 1782 IEEE80211_FTYPE_MGMT | 1783 IEEE80211_STYPE_ACTION, 1784 NULL); 1785 if (!elems) { 1786 ret = -ENOMEM; 1787 goto out; 1788 } 1789 1790 if (elems->parse_error) { 1791 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n"); 1792 ret = -EINVAL; 1793 goto out; 1794 } 1795 1796 if (!elems->ch_sw_timing || !elems->lnk_id) { 1797 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n"); 1798 ret = -EINVAL; 1799 goto out; 1800 } 1801 1802 /* validate the initiator is set correctly */ 1803 local_initiator = 1804 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1805 if (local_initiator == sta->sta.tdls_initiator) { 1806 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1807 ret = -EINVAL; 1808 goto out; 1809 } 1810 1811 params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time); 1812 params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout); 1813 1814 params.tmpl_skb = 1815 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie); 1816 if (!params.tmpl_skb) { 1817 ret = -ENOENT; 1818 goto out; 1819 } 1820 1821 ret = 0; 1822 call_drv: 1823 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1824 1825 tdls_dbg(sdata, 1826 "TDLS channel switch response received from %pM status %d\n", 1827 tf->sa, params.status); 1828 1829 out: 1830 dev_kfree_skb_any(params.tmpl_skb); 1831 kfree(elems); 1832 return ret; 1833 } 1834 1835 static int 1836 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata, 1837 struct sk_buff *skb) 1838 { 1839 struct ieee80211_local *local = sdata->local; 1840 struct ieee802_11_elems *elems; 1841 struct cfg80211_chan_def chandef; 1842 struct ieee80211_channel *chan; 1843 enum nl80211_channel_type chan_type; 1844 int freq; 1845 u8 target_channel, oper_class; 1846 bool local_initiator; 1847 struct sta_info *sta; 1848 enum nl80211_band band; 1849 struct ieee80211_tdls_data *tf = (void *)skb->data; 1850 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1851 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable); 1852 struct ieee80211_tdls_ch_sw_params params = {}; 1853 int ret = 0; 1854 1855 lockdep_assert_wiphy(local->hw.wiphy); 1856 1857 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 1858 params.timestamp = rx_status->device_timestamp; 1859 1860 if (skb->len < baselen) { 1861 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n", 1862 skb->len); 1863 return -EINVAL; 1864 } 1865 1866 target_channel = tf->u.chan_switch_req.target_channel; 1867 oper_class = tf->u.chan_switch_req.oper_class; 1868 1869 /* 1870 * We can't easily infer the channel band. The operating class is 1871 * ambiguous - there are multiple tables (US/Europe/JP/Global). The 1872 * solution here is to treat channels with number >14 as 5GHz ones, 1873 * and specifically check for the (oper_class, channel) combinations 1874 * where this doesn't hold. These are thankfully unique according to 1875 * IEEE802.11-2012. 1876 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as 1877 * valid here. 1878 */ 1879 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 || 1880 oper_class == 4 || oper_class == 5 || oper_class == 6) && 1881 target_channel < 14) 1882 band = NL80211_BAND_5GHZ; 1883 else 1884 band = target_channel < 14 ? NL80211_BAND_2GHZ : 1885 NL80211_BAND_5GHZ; 1886 1887 freq = ieee80211_channel_to_frequency(target_channel, band); 1888 if (freq == 0) { 1889 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n", 1890 target_channel); 1891 return -EINVAL; 1892 } 1893 1894 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq); 1895 if (!chan) { 1896 tdls_dbg(sdata, 1897 "Unsupported channel for TDLS chan switch: %d\n", 1898 target_channel); 1899 return -EINVAL; 1900 } 1901 1902 elems = ieee802_11_parse_elems(tf->u.chan_switch_req.variable, 1903 skb->len - baselen, 1904 IEEE80211_FTYPE_MGMT | 1905 IEEE80211_STYPE_ACTION, 1906 NULL); 1907 if (!elems) 1908 return -ENOMEM; 1909 1910 if (elems->parse_error) { 1911 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n"); 1912 ret = -EINVAL; 1913 goto free; 1914 } 1915 1916 if (!elems->ch_sw_timing || !elems->lnk_id) { 1917 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n"); 1918 ret = -EINVAL; 1919 goto free; 1920 } 1921 1922 if (!elems->sec_chan_offs) { 1923 chan_type = NL80211_CHAN_HT20; 1924 } else { 1925 switch (elems->sec_chan_offs->sec_chan_offs) { 1926 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 1927 chan_type = NL80211_CHAN_HT40PLUS; 1928 break; 1929 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 1930 chan_type = NL80211_CHAN_HT40MINUS; 1931 break; 1932 default: 1933 chan_type = NL80211_CHAN_HT20; 1934 break; 1935 } 1936 } 1937 1938 cfg80211_chandef_create(&chandef, chan, chan_type); 1939 1940 /* we will be active on the TDLS link */ 1941 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef, 1942 sdata->wdev.iftype)) { 1943 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n"); 1944 ret = -EINVAL; 1945 goto free; 1946 } 1947 1948 sta = sta_info_get(sdata, tf->sa); 1949 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1950 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1951 tf->sa); 1952 ret = -EINVAL; 1953 goto out; 1954 } 1955 1956 params.sta = &sta->sta; 1957 1958 /* validate the initiator is set correctly */ 1959 local_initiator = 1960 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1961 if (local_initiator == sta->sta.tdls_initiator) { 1962 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1963 ret = -EINVAL; 1964 goto out; 1965 } 1966 1967 /* peer should have known better */ 1968 if (!sta->sta.deflink.ht_cap.ht_supported && elems->sec_chan_offs && 1969 elems->sec_chan_offs->sec_chan_offs) { 1970 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n"); 1971 ret = -EOPNOTSUPP; 1972 goto out; 1973 } 1974 1975 params.chandef = &chandef; 1976 params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time); 1977 params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout); 1978 1979 params.tmpl_skb = 1980 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, 1981 ¶ms.ch_sw_tm_ie); 1982 if (!params.tmpl_skb) { 1983 ret = -ENOENT; 1984 goto out; 1985 } 1986 1987 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1988 1989 tdls_dbg(sdata, 1990 "TDLS ch switch request received from %pM ch %d width %d\n", 1991 tf->sa, params.chandef->chan->center_freq, 1992 params.chandef->width); 1993 out: 1994 dev_kfree_skb_any(params.tmpl_skb); 1995 free: 1996 kfree(elems); 1997 return ret; 1998 } 1999 2000 void 2001 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata, 2002 struct sk_buff *skb) 2003 { 2004 struct ieee80211_tdls_data *tf = (void *)skb->data; 2005 struct wiphy *wiphy = sdata->local->hw.wiphy; 2006 2007 lockdep_assert_wiphy(wiphy); 2008 2009 /* make sure the driver supports it */ 2010 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH)) 2011 return; 2012 2013 /* we want to access the entire packet */ 2014 if (skb_linearize(skb)) 2015 return; 2016 /* 2017 * The packet/size was already validated by mac80211 Rx path, only look 2018 * at the action type. 2019 */ 2020 switch (tf->action_code) { 2021 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 2022 ieee80211_process_tdls_channel_switch_req(sdata, skb); 2023 break; 2024 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 2025 ieee80211_process_tdls_channel_switch_resp(sdata, skb); 2026 break; 2027 default: 2028 WARN_ON_ONCE(1); 2029 return; 2030 } 2031 } 2032 2033 void ieee80211_teardown_tdls_peers(struct ieee80211_link_data *link) 2034 { 2035 struct ieee80211_sub_if_data *sdata = link->sdata; 2036 struct sta_info *sta; 2037 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED; 2038 2039 rcu_read_lock(); 2040 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 2041 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 2042 !test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2043 continue; 2044 2045 if (sta->deflink.link_id != link->link_id) 2046 continue; 2047 2048 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr, 2049 NL80211_TDLS_TEARDOWN, reason, 2050 GFP_ATOMIC); 2051 } 2052 rcu_read_unlock(); 2053 } 2054 2055 void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata, 2056 const u8 *peer, u16 reason) 2057 { 2058 struct ieee80211_sta *sta; 2059 2060 rcu_read_lock(); 2061 sta = ieee80211_find_sta(&sdata->vif, peer); 2062 if (!sta || !sta->tdls) { 2063 rcu_read_unlock(); 2064 return; 2065 } 2066 rcu_read_unlock(); 2067 2068 tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n", 2069 peer, reason, 2070 ieee80211_get_reason_code_string(reason)); 2071 2072 ieee80211_tdls_oper_request(&sdata->vif, peer, 2073 NL80211_TDLS_TEARDOWN, 2074 WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE, 2075 GFP_ATOMIC); 2076 } 2077