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 int i; 316 317 switch (ieee80211_sta_current_bw(&sta->deflink, &uc, 318 IEEE80211_STA_BW_RX_FROM_STA)) { 319 case IEEE80211_STA_RX_BW_20: 320 max_width = NL80211_CHAN_WIDTH_20; 321 break; 322 case IEEE80211_STA_RX_BW_40: 323 max_width = NL80211_CHAN_WIDTH_40; 324 break; 325 default: /* 80 or higher, only support upgrade to 80 */ 326 max_width = NL80211_CHAN_WIDTH_80; 327 break; 328 } 329 330 if (uc.width >= max_width) 331 return; 332 /* 333 * Channel usage constrains in the IEEE802.11ac-2013 specification only 334 * allow expanding a 20MHz channel to 80MHz in a single way. In 335 * addition, there are no 40MHz allowed channels that are not part of 336 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here). 337 */ 338 for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++) 339 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) { 340 uc.center_freq1 = centers_80mhz[i]; 341 uc.center_freq2 = 0; 342 uc.width = NL80211_CHAN_WIDTH_80; 343 break; 344 } 345 346 if (!uc.center_freq1) 347 return; 348 349 /* proceed to downgrade the chandef until usable or the same as AP BW */ 350 while (uc.width > max_width || 351 (uc.width > sta->tdls_chandef.width && 352 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc, 353 sdata->wdev.iftype))) 354 ieee80211_chandef_downgrade(&uc, NULL); 355 356 if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) { 357 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n", 358 sta->tdls_chandef.width, uc.width); 359 360 /* 361 * the station is not yet authorized when BW upgrade is done, 362 * locking is not required 363 */ 364 sta->tdls_chandef = uc; 365 } 366 } 367 368 static void 369 ieee80211_tdls_add_setup_start_ies(struct ieee80211_link_data *link, 370 struct sk_buff *skb, const u8 *peer, 371 u8 action_code, bool initiator, 372 const u8 *extra_ies, size_t extra_ies_len) 373 { 374 struct ieee80211_sub_if_data *sdata = link->sdata; 375 struct ieee80211_supported_band *sband; 376 struct ieee80211_local *local = sdata->local; 377 struct ieee80211_sta_ht_cap ht_cap; 378 struct ieee80211_sta_vht_cap vht_cap; 379 const struct ieee80211_sta_he_cap *he_cap; 380 const struct ieee80211_sta_eht_cap *eht_cap; 381 struct sta_info *sta = NULL; 382 size_t offset = 0, noffset; 383 u8 *pos; 384 385 sband = ieee80211_get_link_sband(link); 386 if (WARN_ON_ONCE(!sband)) 387 return; 388 389 ieee80211_put_srates_elem(skb, sband, 0, 0, WLAN_EID_SUPP_RATES); 390 ieee80211_put_srates_elem(skb, sband, 0, 0, WLAN_EID_EXT_SUPP_RATES); 391 ieee80211_tdls_add_supp_channels(sdata, skb); 392 393 /* add any custom IEs that go before Extended Capabilities */ 394 if (extra_ies_len) { 395 static const u8 before_ext_cap[] = { 396 WLAN_EID_SUPP_RATES, 397 WLAN_EID_COUNTRY, 398 WLAN_EID_EXT_SUPP_RATES, 399 WLAN_EID_SUPPORTED_CHANNELS, 400 WLAN_EID_RSN, 401 }; 402 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 403 before_ext_cap, 404 ARRAY_SIZE(before_ext_cap), 405 offset); 406 skb_put_data(skb, extra_ies + offset, noffset - offset); 407 offset = noffset; 408 } 409 410 ieee80211_tdls_add_ext_capab(link, skb); 411 412 /* add the QoS element if we support it */ 413 if (local->hw.queues >= IEEE80211_NUM_ACS && 414 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES) 415 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */ 416 417 /* add any custom IEs that go before HT capabilities */ 418 if (extra_ies_len) { 419 static const u8 before_ht_cap[] = { 420 WLAN_EID_SUPP_RATES, 421 WLAN_EID_COUNTRY, 422 WLAN_EID_EXT_SUPP_RATES, 423 WLAN_EID_SUPPORTED_CHANNELS, 424 WLAN_EID_RSN, 425 WLAN_EID_EXT_CAPABILITY, 426 WLAN_EID_QOS_CAPA, 427 WLAN_EID_FAST_BSS_TRANSITION, 428 WLAN_EID_TIMEOUT_INTERVAL, 429 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 430 }; 431 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 432 before_ht_cap, 433 ARRAY_SIZE(before_ht_cap), 434 offset); 435 skb_put_data(skb, extra_ies + offset, noffset - offset); 436 offset = noffset; 437 } 438 439 /* we should have the peer STA if we're already responding */ 440 if (action_code == WLAN_TDLS_SETUP_RESPONSE) { 441 sta = sta_info_get(sdata, peer); 442 if (WARN_ON_ONCE(!sta)) 443 return; 444 445 sta->tdls_chandef = link->conf->chanreq.oper; 446 } 447 448 ieee80211_tdls_add_oper_classes(link, skb); 449 450 /* 451 * with TDLS we can switch channels, and HT-caps are not necessarily 452 * the same on all bands. The specification limits the setup to a 453 * single HT-cap, so use the current band for now. 454 */ 455 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 456 457 if ((action_code == WLAN_TDLS_SETUP_REQUEST || 458 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && 459 ht_cap.ht_supported) { 460 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 461 462 /* disable SMPS in TDLS initiator */ 463 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED 464 << IEEE80211_HT_CAP_SM_PS_SHIFT; 465 466 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 467 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 468 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && 469 ht_cap.ht_supported && sta->sta.deflink.ht_cap.ht_supported) { 470 /* the peer caps are already intersected with our own */ 471 memcpy(&ht_cap, &sta->sta.deflink.ht_cap, sizeof(ht_cap)); 472 473 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 474 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 475 } 476 477 if (ht_cap.ht_supported && 478 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 479 ieee80211_tdls_add_bss_coex_ie(skb); 480 481 ieee80211_tdls_add_link_ie(link, skb, peer, initiator); 482 483 /* add any custom IEs that go before VHT capabilities */ 484 if (extra_ies_len) { 485 static const u8 before_vht_cap[] = { 486 WLAN_EID_SUPP_RATES, 487 WLAN_EID_COUNTRY, 488 WLAN_EID_EXT_SUPP_RATES, 489 WLAN_EID_SUPPORTED_CHANNELS, 490 WLAN_EID_RSN, 491 WLAN_EID_EXT_CAPABILITY, 492 WLAN_EID_QOS_CAPA, 493 WLAN_EID_FAST_BSS_TRANSITION, 494 WLAN_EID_TIMEOUT_INTERVAL, 495 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 496 WLAN_EID_MULTI_BAND, 497 }; 498 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 499 before_vht_cap, 500 ARRAY_SIZE(before_vht_cap), 501 offset); 502 skb_put_data(skb, extra_ies + offset, noffset - offset); 503 offset = noffset; 504 } 505 506 /* add AID if VHT, HE or EHT capabilities supported */ 507 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap)); 508 he_cap = ieee80211_get_he_iftype_cap_vif(sband, &sdata->vif); 509 eht_cap = ieee80211_get_eht_iftype_cap_vif(sband, &sdata->vif); 510 if ((vht_cap.vht_supported || he_cap || eht_cap) && 511 (action_code == WLAN_TDLS_SETUP_REQUEST || 512 action_code == WLAN_TDLS_SETUP_RESPONSE)) 513 ieee80211_tdls_add_aid(sdata, skb); 514 515 /* build the VHT-cap similarly to the HT-cap */ 516 if ((action_code == WLAN_TDLS_SETUP_REQUEST || 517 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && 518 vht_cap.vht_supported) { 519 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap); 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 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && 524 vht_cap.vht_supported && sta->sta.deflink.vht_cap.vht_supported) { 525 /* the peer caps are already intersected with our own */ 526 memcpy(&vht_cap, &sta->sta.deflink.vht_cap, sizeof(vht_cap)); 527 528 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 529 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap); 530 531 /* 532 * if both peers support WIDER_BW, we can expand the chandef to 533 * a wider compatible one, up to 80MHz 534 */ 535 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) 536 ieee80211_tdls_chandef_vht_upgrade(sdata, sta); 537 } 538 539 /* add any custom IEs that go before HE capabilities */ 540 if (extra_ies_len) { 541 static const u8 before_he_cap[] = { 542 WLAN_EID_EXTENSION, 543 WLAN_EID_EXT_FILS_REQ_PARAMS, 544 WLAN_EID_AP_CSN, 545 }; 546 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 547 before_he_cap, 548 ARRAY_SIZE(before_he_cap), 549 offset); 550 skb_put_data(skb, extra_ies + offset, noffset - offset); 551 offset = noffset; 552 } 553 554 /* build the HE-cap from sband */ 555 if (action_code == WLAN_TDLS_SETUP_REQUEST || 556 action_code == WLAN_TDLS_SETUP_RESPONSE || 557 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) { 558 ieee80211_put_he_cap(skb, sdata, sband, NULL); 559 560 /* Build HE 6Ghz capa IE from sband */ 561 if (sband->band == NL80211_BAND_6GHZ) 562 ieee80211_put_he_6ghz_cap(skb, sdata, link->smps_mode); 563 } 564 565 /* add any custom IEs that go before EHT capabilities */ 566 if (extra_ies_len) { 567 static const u8 before_he_cap[] = { 568 WLAN_EID_EXTENSION, 569 WLAN_EID_EXT_FILS_REQ_PARAMS, 570 WLAN_EID_AP_CSN, 571 }; 572 573 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 574 before_he_cap, 575 ARRAY_SIZE(before_he_cap), 576 offset); 577 skb_put_data(skb, extra_ies + offset, noffset - offset); 578 offset = noffset; 579 } 580 581 /* build the EHT-cap from sband */ 582 if (action_code == WLAN_TDLS_SETUP_REQUEST || 583 action_code == WLAN_TDLS_SETUP_RESPONSE || 584 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) 585 ieee80211_put_eht_cap(skb, sdata, sband, NULL); 586 587 /* add any remaining IEs */ 588 if (extra_ies_len) { 589 noffset = extra_ies_len; 590 skb_put_data(skb, extra_ies + offset, noffset - offset); 591 } 592 593 } 594 595 static void 596 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_link_data *link, 597 struct sk_buff *skb, const u8 *peer, 598 bool initiator, const u8 *extra_ies, 599 size_t extra_ies_len) 600 { 601 struct ieee80211_sub_if_data *sdata = link->sdata; 602 struct ieee80211_local *local = sdata->local; 603 size_t offset = 0, noffset; 604 struct sta_info *sta, *ap_sta; 605 struct ieee80211_supported_band *sband; 606 u8 *pos; 607 608 sband = ieee80211_get_link_sband(link); 609 if (WARN_ON_ONCE(!sband)) 610 return; 611 612 sta = sta_info_get(sdata, peer); 613 ap_sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 614 615 if (WARN_ON_ONCE(!sta || !ap_sta)) 616 return; 617 618 sta->tdls_chandef = link->conf->chanreq.oper; 619 620 /* add any custom IEs that go before the QoS IE */ 621 if (extra_ies_len) { 622 static const u8 before_qos[] = { 623 WLAN_EID_RSN, 624 }; 625 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 626 before_qos, 627 ARRAY_SIZE(before_qos), 628 offset); 629 skb_put_data(skb, extra_ies + offset, noffset - offset); 630 offset = noffset; 631 } 632 633 /* add the QoS param IE if both the peer and we support it */ 634 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme) 635 ieee80211_tdls_add_wmm_param_ie(sdata, skb); 636 637 /* add any custom IEs that go before HT operation */ 638 if (extra_ies_len) { 639 static const u8 before_ht_op[] = { 640 WLAN_EID_RSN, 641 WLAN_EID_QOS_CAPA, 642 WLAN_EID_FAST_BSS_TRANSITION, 643 WLAN_EID_TIMEOUT_INTERVAL, 644 }; 645 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 646 before_ht_op, 647 ARRAY_SIZE(before_ht_op), 648 offset); 649 skb_put_data(skb, extra_ies + offset, noffset - offset); 650 offset = noffset; 651 } 652 653 /* 654 * if HT support is only added in TDLS, we need an HT-operation IE. 655 * add the IE as required by IEEE802.11-2012 9.23.3.2. 656 */ 657 if (!ap_sta->sta.deflink.ht_cap.ht_supported && sta->sta.deflink.ht_cap.ht_supported) { 658 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | 659 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | 660 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; 661 662 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation)); 663 ieee80211_ie_build_ht_oper(pos, &sta->sta.deflink.ht_cap, 664 &link->conf->chanreq.oper, prot, 665 true); 666 } 667 668 ieee80211_tdls_add_link_ie(link, skb, peer, initiator); 669 670 /* only include VHT-operation if not on the 2.4GHz band */ 671 if (sband->band != NL80211_BAND_2GHZ && 672 sta->sta.deflink.vht_cap.vht_supported) { 673 /* 674 * if both peers support WIDER_BW, we can expand the chandef to 675 * a wider compatible one, up to 80MHz 676 */ 677 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) 678 ieee80211_tdls_chandef_vht_upgrade(sdata, sta); 679 680 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation)); 681 ieee80211_ie_build_vht_oper(pos, &sta->sta.deflink.vht_cap, 682 &sta->tdls_chandef); 683 } 684 685 /* add any remaining IEs */ 686 if (extra_ies_len) { 687 noffset = extra_ies_len; 688 skb_put_data(skb, extra_ies + offset, noffset - offset); 689 } 690 } 691 692 static void 693 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_link_data *link, 694 struct sk_buff *skb, const u8 *peer, 695 bool initiator, const u8 *extra_ies, 696 size_t extra_ies_len, u8 oper_class, 697 struct cfg80211_chan_def *chandef) 698 { 699 struct ieee80211_tdls_data *tf; 700 size_t offset = 0, noffset; 701 702 if (WARN_ON_ONCE(!chandef)) 703 return; 704 705 tf = (void *)skb->data; 706 tf->u.chan_switch_req.target_channel = 707 ieee80211_frequency_to_channel(chandef->chan->center_freq); 708 tf->u.chan_switch_req.oper_class = oper_class; 709 710 if (extra_ies_len) { 711 static const u8 before_lnkie[] = { 712 WLAN_EID_SECONDARY_CHANNEL_OFFSET, 713 }; 714 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 715 before_lnkie, 716 ARRAY_SIZE(before_lnkie), 717 offset); 718 skb_put_data(skb, extra_ies + offset, noffset - offset); 719 offset = noffset; 720 } 721 722 ieee80211_tdls_add_link_ie(link, skb, peer, initiator); 723 724 /* add any remaining IEs */ 725 if (extra_ies_len) { 726 noffset = extra_ies_len; 727 skb_put_data(skb, extra_ies + offset, noffset - offset); 728 } 729 } 730 731 static void 732 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_link_data *link, 733 struct sk_buff *skb, const u8 *peer, 734 u16 status_code, bool initiator, 735 const u8 *extra_ies, 736 size_t extra_ies_len) 737 { 738 if (status_code == 0) 739 ieee80211_tdls_add_link_ie(link, skb, peer, initiator); 740 741 if (extra_ies_len) 742 skb_put_data(skb, extra_ies, extra_ies_len); 743 } 744 745 static void ieee80211_tdls_add_ies(struct ieee80211_link_data *link, 746 struct sk_buff *skb, const u8 *peer, 747 u8 action_code, u16 status_code, 748 bool initiator, const u8 *extra_ies, 749 size_t extra_ies_len, u8 oper_class, 750 struct cfg80211_chan_def *chandef) 751 { 752 switch (action_code) { 753 case WLAN_TDLS_SETUP_REQUEST: 754 case WLAN_TDLS_SETUP_RESPONSE: 755 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 756 if (status_code == 0) 757 ieee80211_tdls_add_setup_start_ies(link, 758 skb, peer, 759 action_code, 760 initiator, 761 extra_ies, 762 extra_ies_len); 763 break; 764 case WLAN_TDLS_SETUP_CONFIRM: 765 if (status_code == 0) 766 ieee80211_tdls_add_setup_cfm_ies(link, skb, peer, 767 initiator, extra_ies, 768 extra_ies_len); 769 break; 770 case WLAN_TDLS_TEARDOWN: 771 case WLAN_TDLS_DISCOVERY_REQUEST: 772 if (extra_ies_len) 773 skb_put_data(skb, extra_ies, extra_ies_len); 774 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN) 775 ieee80211_tdls_add_link_ie(link, skb, 776 peer, initiator); 777 break; 778 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 779 ieee80211_tdls_add_chan_switch_req_ies(link, skb, peer, 780 initiator, extra_ies, 781 extra_ies_len, 782 oper_class, chandef); 783 break; 784 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 785 ieee80211_tdls_add_chan_switch_resp_ies(link, skb, peer, 786 status_code, 787 initiator, extra_ies, 788 extra_ies_len); 789 break; 790 } 791 792 } 793 794 static int 795 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev, 796 struct ieee80211_link_data *link, 797 const u8 *peer, u8 action_code, u8 dialog_token, 798 u16 status_code, struct sk_buff *skb) 799 { 800 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 801 struct ieee80211_tdls_data *tf; 802 803 tf = skb_put(skb, offsetof(struct ieee80211_tdls_data, u)); 804 805 memcpy(tf->da, peer, ETH_ALEN); 806 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN); 807 tf->ether_type = cpu_to_be16(ETH_P_TDLS); 808 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE; 809 810 /* network header is after the ethernet header */ 811 skb_set_network_header(skb, ETH_HLEN); 812 813 switch (action_code) { 814 case WLAN_TDLS_SETUP_REQUEST: 815 tf->category = WLAN_CATEGORY_TDLS; 816 tf->action_code = WLAN_TDLS_SETUP_REQUEST; 817 818 skb_put(skb, sizeof(tf->u.setup_req)); 819 tf->u.setup_req.dialog_token = dialog_token; 820 tf->u.setup_req.capability = 821 cpu_to_le16(ieee80211_get_tdls_sta_capab(link, 822 status_code)); 823 break; 824 case WLAN_TDLS_SETUP_RESPONSE: 825 tf->category = WLAN_CATEGORY_TDLS; 826 tf->action_code = WLAN_TDLS_SETUP_RESPONSE; 827 828 skb_put(skb, sizeof(tf->u.setup_resp)); 829 tf->u.setup_resp.status_code = cpu_to_le16(status_code); 830 tf->u.setup_resp.dialog_token = dialog_token; 831 tf->u.setup_resp.capability = 832 cpu_to_le16(ieee80211_get_tdls_sta_capab(link, 833 status_code)); 834 break; 835 case WLAN_TDLS_SETUP_CONFIRM: 836 tf->category = WLAN_CATEGORY_TDLS; 837 tf->action_code = WLAN_TDLS_SETUP_CONFIRM; 838 839 skb_put(skb, sizeof(tf->u.setup_cfm)); 840 tf->u.setup_cfm.status_code = cpu_to_le16(status_code); 841 tf->u.setup_cfm.dialog_token = dialog_token; 842 break; 843 case WLAN_TDLS_TEARDOWN: 844 tf->category = WLAN_CATEGORY_TDLS; 845 tf->action_code = WLAN_TDLS_TEARDOWN; 846 847 skb_put(skb, sizeof(tf->u.teardown)); 848 tf->u.teardown.reason_code = cpu_to_le16(status_code); 849 break; 850 case WLAN_TDLS_DISCOVERY_REQUEST: 851 tf->category = WLAN_CATEGORY_TDLS; 852 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST; 853 854 skb_put(skb, sizeof(tf->u.discover_req)); 855 tf->u.discover_req.dialog_token = dialog_token; 856 break; 857 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 858 tf->category = WLAN_CATEGORY_TDLS; 859 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 860 861 skb_put(skb, sizeof(tf->u.chan_switch_req)); 862 break; 863 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 864 tf->category = WLAN_CATEGORY_TDLS; 865 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 866 867 skb_put(skb, sizeof(tf->u.chan_switch_resp)); 868 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code); 869 break; 870 default: 871 return -EINVAL; 872 } 873 874 return 0; 875 } 876 877 static int 878 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev, 879 const u8 *peer, struct ieee80211_link_data *link, 880 u8 action_code, u8 dialog_token, 881 u16 status_code, struct sk_buff *skb) 882 { 883 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 884 struct ieee80211_mgmt *mgmt; 885 886 if (action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES) 887 return -EINVAL; 888 889 mgmt = skb_put_zero(skb, IEEE80211_MIN_ACTION_SIZE(tdls_discover_resp)); 890 memcpy(mgmt->da, peer, ETH_ALEN); 891 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 892 memcpy(mgmt->bssid, link->u.mgd.bssid, ETH_ALEN); 893 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 894 IEEE80211_STYPE_ACTION); 895 896 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC; 897 mgmt->u.action.action_code = WLAN_PUB_ACTION_TDLS_DISCOVER_RES; 898 899 mgmt->u.action.tdls_discover_resp.dialog_token = dialog_token; 900 mgmt->u.action.tdls_discover_resp.capability = 901 cpu_to_le16(ieee80211_get_tdls_sta_capab(link, 902 status_code)); 903 904 return 0; 905 } 906 907 static struct sk_buff * 908 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata, 909 const u8 *peer, int link_id, 910 u8 action_code, u8 dialog_token, 911 u16 status_code, bool initiator, 912 const u8 *extra_ies, size_t extra_ies_len, 913 u8 oper_class, 914 struct cfg80211_chan_def *chandef) 915 { 916 struct ieee80211_local *local = sdata->local; 917 struct sk_buff *skb; 918 int ret; 919 struct ieee80211_link_data *link; 920 921 link_id = link_id >= 0 ? link_id : 0; 922 rcu_read_lock(); 923 link = rcu_dereference(sdata->link[link_id]); 924 if (WARN_ON(!link)) 925 goto unlock; 926 927 skb = netdev_alloc_skb(sdata->dev, 928 local->hw.extra_tx_headroom + 929 max(sizeof(struct ieee80211_mgmt), 930 sizeof(struct ieee80211_tdls_data)) + 931 50 + /* supported rates */ 932 10 + /* ext capab */ 933 26 + /* max(WMM-info, WMM-param) */ 934 2 + max(sizeof(struct ieee80211_ht_cap), 935 sizeof(struct ieee80211_ht_operation)) + 936 2 + max(sizeof(struct ieee80211_vht_cap), 937 sizeof(struct ieee80211_vht_operation)) + 938 2 + 1 + sizeof(struct ieee80211_he_cap_elem) + 939 sizeof(struct ieee80211_he_mcs_nss_supp) + 940 IEEE80211_HE_PPE_THRES_MAX_LEN + 941 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) + 942 2 + 1 + sizeof(struct ieee80211_eht_cap_elem) + 943 sizeof(struct ieee80211_eht_mcs_nss_supp) + 944 IEEE80211_EHT_PPE_THRES_MAX_LEN + 945 50 + /* supported channels */ 946 3 + /* 40/20 BSS coex */ 947 4 + /* AID */ 948 4 + /* oper classes */ 949 extra_ies_len + 950 sizeof(struct ieee80211_tdls_lnkie)); 951 if (!skb) 952 goto unlock; 953 954 skb_reserve(skb, local->hw.extra_tx_headroom); 955 956 switch (action_code) { 957 case WLAN_TDLS_SETUP_REQUEST: 958 case WLAN_TDLS_SETUP_RESPONSE: 959 case WLAN_TDLS_SETUP_CONFIRM: 960 case WLAN_TDLS_TEARDOWN: 961 case WLAN_TDLS_DISCOVERY_REQUEST: 962 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 963 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 964 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy, 965 sdata->dev, link, peer, 966 action_code, dialog_token, 967 status_code, skb); 968 break; 969 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 970 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev, 971 peer, link, action_code, 972 dialog_token, status_code, 973 skb); 974 break; 975 default: 976 ret = -EOPNOTSUPP; 977 break; 978 } 979 980 if (ret < 0) 981 goto fail; 982 983 ieee80211_tdls_add_ies(link, skb, peer, action_code, status_code, 984 initiator, extra_ies, extra_ies_len, oper_class, 985 chandef); 986 rcu_read_unlock(); 987 return skb; 988 989 fail: 990 dev_kfree_skb(skb); 991 unlock: 992 rcu_read_unlock(); 993 return NULL; 994 } 995 996 static int 997 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev, 998 const u8 *peer, int link_id, 999 u8 action_code, u8 dialog_token, 1000 u16 status_code, u32 peer_capability, 1001 bool initiator, const u8 *extra_ies, 1002 size_t extra_ies_len, u8 oper_class, 1003 struct cfg80211_chan_def *chandef) 1004 { 1005 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1006 struct sk_buff *skb = NULL; 1007 struct sta_info *sta; 1008 u32 flags = 0; 1009 int ret = 0; 1010 1011 rcu_read_lock(); 1012 sta = sta_info_get(sdata, peer); 1013 1014 /* infer the initiator if we can, to support old userspace */ 1015 switch (action_code) { 1016 case WLAN_TDLS_SETUP_REQUEST: 1017 if (sta) { 1018 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); 1019 sta->sta.tdls_initiator = false; 1020 } 1021 fallthrough; 1022 case WLAN_TDLS_SETUP_CONFIRM: 1023 case WLAN_TDLS_DISCOVERY_REQUEST: 1024 initiator = true; 1025 break; 1026 case WLAN_TDLS_SETUP_RESPONSE: 1027 /* 1028 * In some testing scenarios, we send a request and response. 1029 * Make the last packet sent take effect for the initiator 1030 * value. 1031 */ 1032 if (sta) { 1033 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); 1034 sta->sta.tdls_initiator = true; 1035 } 1036 fallthrough; 1037 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 1038 initiator = false; 1039 break; 1040 case WLAN_TDLS_TEARDOWN: 1041 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 1042 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 1043 /* any value is ok */ 1044 break; 1045 default: 1046 ret = -EOPNOTSUPP; 1047 break; 1048 } 1049 1050 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR)) 1051 initiator = true; 1052 1053 rcu_read_unlock(); 1054 if (ret < 0) 1055 goto fail; 1056 1057 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, 1058 link_id, action_code, 1059 dialog_token, status_code, 1060 initiator, extra_ies, 1061 extra_ies_len, oper_class, 1062 chandef); 1063 if (!skb) { 1064 ret = -EINVAL; 1065 goto fail; 1066 } 1067 1068 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) { 1069 ieee80211_tx_skb_tid(sdata, skb, 7, link_id); 1070 return 0; 1071 } 1072 1073 /* 1074 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise 1075 * we should default to AC_VI. 1076 */ 1077 switch (action_code) { 1078 case WLAN_TDLS_SETUP_REQUEST: 1079 case WLAN_TDLS_SETUP_RESPONSE: 1080 skb->priority = 256 + 2; 1081 break; 1082 default: 1083 skb->priority = 256 + 5; 1084 break; 1085 } 1086 1087 /* 1088 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress. 1089 * Later, if no ACK is returned from peer, we will re-send the teardown 1090 * packet through the AP. 1091 */ 1092 if ((action_code == WLAN_TDLS_TEARDOWN) && 1093 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) { 1094 bool try_resend; /* Should we keep skb for possible resend */ 1095 1096 /* If not sending directly to peer - no point in keeping skb */ 1097 rcu_read_lock(); 1098 sta = sta_info_get(sdata, peer); 1099 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1100 rcu_read_unlock(); 1101 1102 spin_lock_bh(&sdata->u.mgd.teardown_lock); 1103 if (try_resend && !sdata->u.mgd.teardown_skb) { 1104 /* Mark it as requiring TX status callback */ 1105 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | 1106 IEEE80211_TX_INTFL_MLME_CONN_TX; 1107 1108 /* 1109 * skb is copied since mac80211 will later set 1110 * properties that might not be the same as the AP, 1111 * such as encryption, QoS, addresses, etc. 1112 * 1113 * No problem if skb_copy() fails, so no need to check. 1114 */ 1115 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC); 1116 sdata->u.mgd.orig_teardown_skb = skb; 1117 } 1118 spin_unlock_bh(&sdata->u.mgd.teardown_lock); 1119 } 1120 1121 /* disable bottom halves when entering the Tx path */ 1122 local_bh_disable(); 1123 __ieee80211_subif_start_xmit(skb, dev, flags, 1124 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 0); 1125 local_bh_enable(); 1126 1127 return ret; 1128 1129 fail: 1130 dev_kfree_skb(skb); 1131 return ret; 1132 } 1133 1134 static int 1135 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev, 1136 const u8 *peer, int link_id, 1137 u8 action_code, u8 dialog_token, 1138 u16 status_code, u32 peer_capability, bool initiator, 1139 const u8 *extra_ies, size_t extra_ies_len) 1140 { 1141 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1142 struct ieee80211_local *local = sdata->local; 1143 enum ieee80211_smps_mode smps_mode = 1144 sdata->deflink.u.mgd.driver_smps_mode; 1145 struct sta_info *sta; 1146 int ret; 1147 1148 /* don't support setup with forced SMPS mode that's not off */ 1149 if (smps_mode != IEEE80211_SMPS_AUTOMATIC && 1150 smps_mode != IEEE80211_SMPS_OFF) { 1151 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n", 1152 smps_mode); 1153 return -EOPNOTSUPP; 1154 } 1155 1156 lockdep_assert_wiphy(local->hw.wiphy); 1157 1158 /* we don't support concurrent TDLS peer setups */ 1159 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) && 1160 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1161 ret = -EBUSY; 1162 goto out_unlock; 1163 } 1164 1165 /* 1166 * make sure we have a STA representing the peer so we drop or buffer 1167 * non-TDLS-setup frames to the peer. We can't send other packets 1168 * during setup through the AP path. 1169 * Allow error packets to be sent - sometimes we don't even add a STA 1170 * before failing the setup. 1171 */ 1172 sta = sta_info_get(sdata, peer); 1173 if ((status_code == 0 && !sta) || (sta && !sta->sta.tdls)) { 1174 ret = -ENOLINK; 1175 goto out_unlock; 1176 } 1177 1178 ieee80211_flush_queues(local, sdata, false); 1179 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN); 1180 1181 /* we cannot take the mutex while preparing the setup packet */ 1182 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1183 link_id, action_code, 1184 dialog_token, status_code, 1185 peer_capability, initiator, 1186 extra_ies, extra_ies_len, 0, 1187 NULL); 1188 if (ret < 0) { 1189 eth_zero_addr(sdata->u.mgd.tdls_peer); 1190 return ret; 1191 } 1192 1193 wiphy_delayed_work_queue(sdata->local->hw.wiphy, 1194 &sdata->u.mgd.tdls_peer_del_work, 1195 TDLS_PEER_SETUP_TIMEOUT); 1196 return 0; 1197 1198 out_unlock: 1199 return ret; 1200 } 1201 1202 static int 1203 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev, 1204 const u8 *peer, int link_id, 1205 u8 action_code, u8 dialog_token, 1206 u16 status_code, u32 peer_capability, 1207 bool initiator, const u8 *extra_ies, 1208 size_t extra_ies_len) 1209 { 1210 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1211 struct ieee80211_local *local = sdata->local; 1212 struct sta_info *sta; 1213 int ret; 1214 1215 /* 1216 * No packets can be transmitted to the peer via the AP during setup - 1217 * the STA is set as a TDLS peer, but is not authorized. 1218 * During teardown, we prevent direct transmissions by stopping the 1219 * queues and flushing all direct packets. 1220 */ 1221 ieee80211_stop_vif_queues(local, sdata, 1222 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1223 ieee80211_flush_queues(local, sdata, false); 1224 1225 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1226 link_id, action_code, 1227 dialog_token, status_code, 1228 peer_capability, initiator, 1229 extra_ies, extra_ies_len, 0, 1230 NULL); 1231 if (ret < 0) 1232 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n", 1233 ret); 1234 1235 /* 1236 * Remove the STA AUTH flag to force further traffic through the AP. If 1237 * the STA was unreachable, it was already removed. 1238 */ 1239 rcu_read_lock(); 1240 sta = sta_info_get(sdata, peer); 1241 if (sta) 1242 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1243 rcu_read_unlock(); 1244 1245 ieee80211_wake_vif_queues(local, sdata, 1246 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1247 1248 return 0; 1249 } 1250 1251 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev, 1252 const u8 *peer, int link_id, 1253 u8 action_code, u8 dialog_token, u16 status_code, 1254 u32 peer_capability, bool initiator, 1255 const u8 *extra_ies, size_t extra_ies_len) 1256 { 1257 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1258 int ret; 1259 1260 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1261 return -EOPNOTSUPP; 1262 1263 /* make sure we are in managed mode, and associated */ 1264 if (sdata->vif.type != NL80211_IFTYPE_STATION || 1265 !sdata->u.mgd.associated) 1266 return -EINVAL; 1267 1268 switch (action_code) { 1269 case WLAN_TDLS_SETUP_REQUEST: 1270 case WLAN_TDLS_SETUP_RESPONSE: 1271 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, 1272 link_id, action_code, 1273 dialog_token, status_code, 1274 peer_capability, initiator, 1275 extra_ies, extra_ies_len); 1276 break; 1277 case WLAN_TDLS_TEARDOWN: 1278 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, link_id, 1279 action_code, dialog_token, 1280 status_code, 1281 peer_capability, initiator, 1282 extra_ies, extra_ies_len); 1283 break; 1284 case WLAN_TDLS_SETUP_CONFIRM: { 1285 struct sta_info *sta; 1286 1287 sta = sta_info_get(sdata, peer); 1288 if (!sta || !sta->sta.tdls) { 1289 ret = -ENOLINK; 1290 break; 1291 } 1292 1293 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1294 link_id, action_code, 1295 dialog_token, 1296 status_code, 1297 peer_capability, 1298 initiator, extra_ies, 1299 extra_ies_len, 0, NULL); 1300 break; 1301 } 1302 case WLAN_TDLS_DISCOVERY_REQUEST: 1303 /* 1304 * Protect the discovery so we can hear the TDLS discovery 1305 * response frame. It is transmitted directly and not buffered 1306 * by the AP. 1307 */ 1308 drv_mgd_protect_tdls_discover(sdata->local, sdata, link_id); 1309 fallthrough; 1310 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 1311 /* no special handling */ 1312 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1313 link_id, action_code, 1314 dialog_token, 1315 status_code, 1316 peer_capability, 1317 initiator, extra_ies, 1318 extra_ies_len, 0, NULL); 1319 break; 1320 default: 1321 ret = -EOPNOTSUPP; 1322 break; 1323 } 1324 1325 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM link_id %d status %d\n", 1326 action_code, peer, link_id, ret); 1327 return ret; 1328 } 1329 1330 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata, 1331 struct sta_info *sta) 1332 { 1333 struct ieee80211_local *local = sdata->local; 1334 struct ieee80211_chanctx_conf *conf; 1335 struct ieee80211_chanctx *ctx; 1336 enum nl80211_chan_width width; 1337 struct ieee80211_supported_band *sband; 1338 1339 lockdep_assert_wiphy(local->hw.wiphy); 1340 1341 conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf, 1342 lockdep_is_held(&local->hw.wiphy->mtx)); 1343 if (conf) { 1344 width = conf->def.width; 1345 sband = local->hw.wiphy->bands[conf->def.chan->band]; 1346 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1347 ieee80211_recalc_chanctx_chantype(local, ctx); 1348 1349 /* if width changed and a peer is given, update its BW */ 1350 if (width != conf->def.width && sta && 1351 test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) { 1352 enum ieee80211_sta_rx_bandwidth bw; 1353 1354 bw = ieee80211_chan_width_to_rx_bw(conf->def.width); 1355 bw = min(bw, ieee80211_sta_current_bw(&sta->deflink, 1356 &conf->def, 1357 IEEE80211_STA_BW_RX_FROM_STA)); 1358 if (bw != sta->sta.deflink.bandwidth) { 1359 sta->sta.deflink.bandwidth = bw; 1360 rate_control_rate_update(local, sband, 1361 &sta->deflink, 1362 IEEE80211_RC_BW_CHANGED); 1363 /* 1364 * if a TDLS peer BW was updated, we need to 1365 * recalc the chandef width again, to get the 1366 * correct chanctx min_def 1367 */ 1368 ieee80211_recalc_chanctx_chantype(local, ctx); 1369 } 1370 } 1371 1372 } 1373 } 1374 1375 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata) 1376 { 1377 struct sta_info *sta; 1378 bool result = false; 1379 1380 rcu_read_lock(); 1381 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 1382 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 1383 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 1384 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) || 1385 !sta->sta.deflink.ht_cap.ht_supported) 1386 continue; 1387 result = true; 1388 break; 1389 } 1390 rcu_read_unlock(); 1391 1392 return result; 1393 } 1394 1395 static void 1396 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata, 1397 struct sta_info *sta) 1398 { 1399 bool tdls_ht; 1400 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | 1401 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | 1402 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; 1403 u16 opmode; 1404 1405 /* Nothing to do if the BSS connection uses (at least) HT */ 1406 if (sdata->deflink.u.mgd.conn.mode >= IEEE80211_CONN_MODE_HT) 1407 return; 1408 1409 tdls_ht = (sta && sta->sta.deflink.ht_cap.ht_supported) || 1410 iee80211_tdls_have_ht_peers(sdata); 1411 1412 opmode = sdata->vif.bss_conf.ht_operation_mode; 1413 1414 if (tdls_ht) 1415 opmode |= protection; 1416 else 1417 opmode &= ~protection; 1418 1419 if (opmode == sdata->vif.bss_conf.ht_operation_mode) 1420 return; 1421 1422 sdata->vif.bss_conf.ht_operation_mode = opmode; 1423 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1424 BSS_CHANGED_HT); 1425 } 1426 1427 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev, 1428 const u8 *peer, enum nl80211_tdls_operation oper) 1429 { 1430 struct sta_info *sta; 1431 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1432 struct ieee80211_local *local = sdata->local; 1433 int ret; 1434 1435 lockdep_assert_wiphy(local->hw.wiphy); 1436 1437 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1438 return -EOPNOTSUPP; 1439 1440 if (sdata->vif.type != NL80211_IFTYPE_STATION || !sdata->vif.cfg.assoc) 1441 return -EINVAL; 1442 1443 switch (oper) { 1444 case NL80211_TDLS_ENABLE_LINK: 1445 case NL80211_TDLS_DISABLE_LINK: 1446 break; 1447 case NL80211_TDLS_TEARDOWN: 1448 case NL80211_TDLS_SETUP: 1449 case NL80211_TDLS_DISCOVERY_REQ: 1450 /* We don't support in-driver setup/teardown/discovery */ 1451 return -EOPNOTSUPP; 1452 } 1453 1454 /* protect possible bss_conf changes and avoid concurrency in 1455 * ieee80211_bss_info_change_notify() 1456 */ 1457 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer); 1458 1459 sta = sta_info_get(sdata, peer); 1460 if (!sta || !sta->sta.tdls) 1461 return -ENOLINK; 1462 1463 switch (oper) { 1464 case NL80211_TDLS_ENABLE_LINK: 1465 if (sdata->vif.bss_conf.csa_active) { 1466 tdls_dbg(sdata, "TDLS: disallow link during CSA\n"); 1467 return -EBUSY; 1468 } 1469 1470 iee80211_tdls_recalc_chanctx(sdata, sta); 1471 iee80211_tdls_recalc_ht_protection(sdata, sta); 1472 1473 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1474 1475 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) || 1476 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)); 1477 break; 1478 case NL80211_TDLS_DISABLE_LINK: 1479 /* 1480 * The teardown message in ieee80211_tdls_mgmt_teardown() was 1481 * created while the queues were stopped, so it might still be 1482 * pending. Before flushing the queues we need to be sure the 1483 * message is handled by the tasklet handling pending messages, 1484 * otherwise we might start destroying the station before 1485 * sending the teardown packet. 1486 * Note that this only forces the tasklet to flush pendings - 1487 * not to stop the tasklet from rescheduling itself. 1488 */ 1489 tasklet_kill(&local->tx_pending_tasklet); 1490 /* flush a potentially queued teardown packet */ 1491 ieee80211_flush_queues(local, sdata, false); 1492 1493 ret = sta_info_destroy_addr(sdata, peer); 1494 1495 iee80211_tdls_recalc_ht_protection(sdata, NULL); 1496 1497 iee80211_tdls_recalc_chanctx(sdata, NULL); 1498 if (ret) 1499 return ret; 1500 break; 1501 default: 1502 return -EOPNOTSUPP; 1503 } 1504 1505 if (ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1506 wiphy_delayed_work_cancel(sdata->local->hw.wiphy, 1507 &sdata->u.mgd.tdls_peer_del_work); 1508 eth_zero_addr(sdata->u.mgd.tdls_peer); 1509 } 1510 1511 wiphy_work_queue(sdata->local->hw.wiphy, 1512 &sdata->deflink.u.mgd.request_smps_work); 1513 1514 return 0; 1515 } 1516 1517 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer, 1518 enum nl80211_tdls_operation oper, 1519 u16 reason_code, gfp_t gfp) 1520 { 1521 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1522 1523 if (vif->type != NL80211_IFTYPE_STATION || !vif->cfg.assoc) { 1524 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n", 1525 oper); 1526 return; 1527 } 1528 1529 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp); 1530 } 1531 EXPORT_SYMBOL(ieee80211_tdls_oper_request); 1532 1533 static void 1534 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout) 1535 { 1536 struct ieee80211_ch_switch_timing *ch_sw; 1537 1538 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING; 1539 *buf++ = sizeof(struct ieee80211_ch_switch_timing); 1540 1541 ch_sw = (void *)buf; 1542 ch_sw->switch_time = cpu_to_le16(switch_time); 1543 ch_sw->switch_timeout = cpu_to_le16(switch_timeout); 1544 } 1545 1546 /* find switch timing IE in SKB ready for Tx */ 1547 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb) 1548 { 1549 struct ieee80211_tdls_data *tf; 1550 const u8 *ie_start; 1551 1552 /* 1553 * Get the offset for the new location of the switch timing IE. 1554 * The SKB network header will now point to the "payload_type" 1555 * element of the TDLS data frame struct. 1556 */ 1557 tf = container_of(skb->data + skb_network_offset(skb), 1558 struct ieee80211_tdls_data, payload_type); 1559 ie_start = tf->u.chan_switch_req.variable; 1560 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start, 1561 skb->len - (ie_start - skb->data)); 1562 } 1563 1564 static struct sk_buff * 1565 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class, 1566 struct cfg80211_chan_def *chandef, 1567 u32 *ch_sw_tm_ie_offset) 1568 { 1569 struct ieee80211_sub_if_data *sdata = sta->sdata; 1570 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) + 1571 2 + sizeof(struct ieee80211_ch_switch_timing)]; 1572 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing); 1573 u8 *pos = extra_ies; 1574 struct sk_buff *skb; 1575 int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0; 1576 1577 /* 1578 * if chandef points to a wide channel add a Secondary-Channel 1579 * Offset information element 1580 */ 1581 if (chandef->width == NL80211_CHAN_WIDTH_40) { 1582 struct ieee80211_sec_chan_offs_ie *sec_chan_ie; 1583 bool ht40plus; 1584 1585 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; 1586 *pos++ = sizeof(*sec_chan_ie); 1587 sec_chan_ie = (void *)pos; 1588 1589 ht40plus = cfg80211_get_chandef_type(chandef) == 1590 NL80211_CHAN_HT40PLUS; 1591 sec_chan_ie->sec_chan_offs = ht40plus ? 1592 IEEE80211_HT_PARAM_CHA_SEC_ABOVE : 1593 IEEE80211_HT_PARAM_CHA_SEC_BELOW; 1594 pos += sizeof(*sec_chan_ie); 1595 1596 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie); 1597 } 1598 1599 /* just set the values to 0, this is a template */ 1600 iee80211_tdls_add_ch_switch_timing(pos, 0, 0); 1601 1602 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1603 link_id, 1604 WLAN_TDLS_CHANNEL_SWITCH_REQUEST, 1605 0, 0, !sta->sta.tdls_initiator, 1606 extra_ies, extra_ies_len, 1607 oper_class, chandef); 1608 if (!skb) 1609 return NULL; 1610 1611 skb = ieee80211_build_data_template(sdata, skb, 0); 1612 if (IS_ERR(skb)) { 1613 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n"); 1614 return NULL; 1615 } 1616 1617 if (ch_sw_tm_ie_offset) { 1618 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1619 1620 if (!tm_ie) { 1621 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n"); 1622 dev_kfree_skb_any(skb); 1623 return NULL; 1624 } 1625 1626 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1627 } 1628 1629 tdls_dbg(sdata, 1630 "TDLS channel switch request template for %pM ch %d width %d\n", 1631 sta->sta.addr, chandef->chan->center_freq, chandef->width); 1632 return skb; 1633 } 1634 1635 int 1636 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev, 1637 const u8 *addr, u8 oper_class, 1638 struct cfg80211_chan_def *chandef) 1639 { 1640 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1641 struct ieee80211_local *local = sdata->local; 1642 struct sta_info *sta; 1643 struct sk_buff *skb = NULL; 1644 u32 ch_sw_tm_ie; 1645 int ret; 1646 1647 lockdep_assert_wiphy(local->hw.wiphy); 1648 1649 if (chandef->chan->freq_offset) 1650 /* this may work, but is untested */ 1651 return -EOPNOTSUPP; 1652 1653 sta = sta_info_get(sdata, addr); 1654 if (!sta) { 1655 tdls_dbg(sdata, 1656 "Invalid TDLS peer %pM for channel switch request\n", 1657 addr); 1658 ret = -ENOENT; 1659 goto out; 1660 } 1661 1662 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) { 1663 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n", 1664 addr); 1665 ret = -EOPNOTSUPP; 1666 goto out; 1667 } 1668 1669 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef, 1670 &ch_sw_tm_ie); 1671 if (!skb) { 1672 ret = -ENOENT; 1673 goto out; 1674 } 1675 1676 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class, 1677 chandef, skb, ch_sw_tm_ie); 1678 if (!ret) 1679 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1680 1681 out: 1682 dev_kfree_skb_any(skb); 1683 return ret; 1684 } 1685 1686 void 1687 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy, 1688 struct net_device *dev, 1689 const u8 *addr) 1690 { 1691 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1692 struct ieee80211_local *local = sdata->local; 1693 struct sta_info *sta; 1694 1695 lockdep_assert_wiphy(local->hw.wiphy); 1696 1697 sta = sta_info_get(sdata, addr); 1698 if (!sta) { 1699 tdls_dbg(sdata, 1700 "Invalid TDLS peer %pM for channel switch cancel\n", 1701 addr); 1702 return; 1703 } 1704 1705 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) { 1706 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n", 1707 addr); 1708 return; 1709 } 1710 1711 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta); 1712 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1713 } 1714 1715 static struct sk_buff * 1716 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta, 1717 u32 *ch_sw_tm_ie_offset) 1718 { 1719 struct ieee80211_sub_if_data *sdata = sta->sdata; 1720 struct sk_buff *skb; 1721 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)]; 1722 int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0; 1723 1724 /* initial timing are always zero in the template */ 1725 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0); 1726 1727 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1728 link_id, 1729 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE, 1730 0, 0, !sta->sta.tdls_initiator, 1731 extra_ies, sizeof(extra_ies), 0, NULL); 1732 if (!skb) 1733 return NULL; 1734 1735 skb = ieee80211_build_data_template(sdata, skb, 0); 1736 if (IS_ERR(skb)) { 1737 tdls_dbg(sdata, 1738 "Failed building TDLS channel switch resp frame\n"); 1739 return NULL; 1740 } 1741 1742 if (ch_sw_tm_ie_offset) { 1743 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1744 1745 if (!tm_ie) { 1746 tdls_dbg(sdata, 1747 "No switch timing IE in TDLS switch resp\n"); 1748 dev_kfree_skb_any(skb); 1749 return NULL; 1750 } 1751 1752 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1753 } 1754 1755 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n", 1756 sta->sta.addr); 1757 return skb; 1758 } 1759 1760 static int 1761 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata, 1762 struct sk_buff *skb) 1763 { 1764 struct ieee80211_local *local = sdata->local; 1765 struct ieee802_11_elems *elems = NULL; 1766 struct sta_info *sta; 1767 struct ieee80211_tdls_data *tf = (void *)skb->data; 1768 bool local_initiator; 1769 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1770 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable); 1771 struct ieee80211_tdls_ch_sw_params params = {}; 1772 int ret; 1773 1774 lockdep_assert_wiphy(local->hw.wiphy); 1775 1776 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 1777 params.timestamp = rx_status->device_timestamp; 1778 1779 if (skb->len < baselen) { 1780 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n", 1781 skb->len); 1782 return -EINVAL; 1783 } 1784 1785 sta = sta_info_get(sdata, tf->sa); 1786 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1787 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1788 tf->sa); 1789 ret = -EINVAL; 1790 goto out; 1791 } 1792 1793 params.sta = &sta->sta; 1794 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code); 1795 if (params.status != 0) { 1796 ret = 0; 1797 goto call_drv; 1798 } 1799 1800 elems = ieee802_11_parse_elems(tf->u.chan_switch_resp.variable, 1801 skb->len - baselen, 1802 IEEE80211_FTYPE_MGMT | 1803 IEEE80211_STYPE_ACTION, 1804 NULL); 1805 if (!elems) { 1806 ret = -ENOMEM; 1807 goto out; 1808 } 1809 1810 if (elems->parse_error) { 1811 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n"); 1812 ret = -EINVAL; 1813 goto out; 1814 } 1815 1816 if (!elems->ch_sw_timing || !elems->lnk_id) { 1817 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n"); 1818 ret = -EINVAL; 1819 goto out; 1820 } 1821 1822 /* validate the initiator is set correctly */ 1823 local_initiator = 1824 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1825 if (local_initiator == sta->sta.tdls_initiator) { 1826 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1827 ret = -EINVAL; 1828 goto out; 1829 } 1830 1831 params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time); 1832 params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout); 1833 1834 params.tmpl_skb = 1835 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie); 1836 if (!params.tmpl_skb) { 1837 ret = -ENOENT; 1838 goto out; 1839 } 1840 1841 ret = 0; 1842 call_drv: 1843 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1844 1845 tdls_dbg(sdata, 1846 "TDLS channel switch response received from %pM status %d\n", 1847 tf->sa, params.status); 1848 1849 out: 1850 dev_kfree_skb_any(params.tmpl_skb); 1851 kfree(elems); 1852 return ret; 1853 } 1854 1855 static int 1856 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata, 1857 struct sk_buff *skb) 1858 { 1859 struct ieee80211_local *local = sdata->local; 1860 struct ieee802_11_elems *elems; 1861 struct cfg80211_chan_def chandef; 1862 struct ieee80211_channel *chan; 1863 enum nl80211_channel_type chan_type; 1864 int freq; 1865 u8 target_channel, oper_class; 1866 bool local_initiator; 1867 struct sta_info *sta; 1868 enum nl80211_band band; 1869 struct ieee80211_tdls_data *tf = (void *)skb->data; 1870 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1871 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable); 1872 struct ieee80211_tdls_ch_sw_params params = {}; 1873 int ret = 0; 1874 1875 lockdep_assert_wiphy(local->hw.wiphy); 1876 1877 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 1878 params.timestamp = rx_status->device_timestamp; 1879 1880 if (skb->len < baselen) { 1881 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n", 1882 skb->len); 1883 return -EINVAL; 1884 } 1885 1886 target_channel = tf->u.chan_switch_req.target_channel; 1887 oper_class = tf->u.chan_switch_req.oper_class; 1888 1889 /* 1890 * We can't easily infer the channel band. The operating class is 1891 * ambiguous - there are multiple tables (US/Europe/JP/Global). The 1892 * solution here is to treat channels with number >14 as 5GHz ones, 1893 * and specifically check for the (oper_class, channel) combinations 1894 * where this doesn't hold. These are thankfully unique according to 1895 * IEEE802.11-2012. 1896 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as 1897 * valid here. 1898 */ 1899 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 || 1900 oper_class == 4 || oper_class == 5 || oper_class == 6) && 1901 target_channel < 14) 1902 band = NL80211_BAND_5GHZ; 1903 else 1904 band = target_channel < 14 ? NL80211_BAND_2GHZ : 1905 NL80211_BAND_5GHZ; 1906 1907 freq = ieee80211_channel_to_frequency(target_channel, band); 1908 if (freq == 0) { 1909 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n", 1910 target_channel); 1911 return -EINVAL; 1912 } 1913 1914 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq); 1915 if (!chan) { 1916 tdls_dbg(sdata, 1917 "Unsupported channel for TDLS chan switch: %d\n", 1918 target_channel); 1919 return -EINVAL; 1920 } 1921 1922 elems = ieee802_11_parse_elems(tf->u.chan_switch_req.variable, 1923 skb->len - baselen, 1924 IEEE80211_FTYPE_MGMT | 1925 IEEE80211_STYPE_ACTION, 1926 NULL); 1927 if (!elems) 1928 return -ENOMEM; 1929 1930 if (elems->parse_error) { 1931 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n"); 1932 ret = -EINVAL; 1933 goto free; 1934 } 1935 1936 if (!elems->ch_sw_timing || !elems->lnk_id) { 1937 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n"); 1938 ret = -EINVAL; 1939 goto free; 1940 } 1941 1942 if (!elems->sec_chan_offs) { 1943 chan_type = NL80211_CHAN_HT20; 1944 } else { 1945 switch (elems->sec_chan_offs->sec_chan_offs) { 1946 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 1947 chan_type = NL80211_CHAN_HT40PLUS; 1948 break; 1949 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 1950 chan_type = NL80211_CHAN_HT40MINUS; 1951 break; 1952 default: 1953 chan_type = NL80211_CHAN_HT20; 1954 break; 1955 } 1956 } 1957 1958 cfg80211_chandef_create(&chandef, chan, chan_type); 1959 1960 /* we will be active on the TDLS link */ 1961 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef, 1962 sdata->wdev.iftype)) { 1963 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n"); 1964 ret = -EINVAL; 1965 goto free; 1966 } 1967 1968 sta = sta_info_get(sdata, tf->sa); 1969 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1970 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1971 tf->sa); 1972 ret = -EINVAL; 1973 goto out; 1974 } 1975 1976 params.sta = &sta->sta; 1977 1978 /* validate the initiator is set correctly */ 1979 local_initiator = 1980 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1981 if (local_initiator == sta->sta.tdls_initiator) { 1982 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1983 ret = -EINVAL; 1984 goto out; 1985 } 1986 1987 /* peer should have known better */ 1988 if (!sta->sta.deflink.ht_cap.ht_supported && elems->sec_chan_offs && 1989 elems->sec_chan_offs->sec_chan_offs) { 1990 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n"); 1991 ret = -EOPNOTSUPP; 1992 goto out; 1993 } 1994 1995 params.chandef = &chandef; 1996 params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time); 1997 params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout); 1998 1999 params.tmpl_skb = 2000 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, 2001 ¶ms.ch_sw_tm_ie); 2002 if (!params.tmpl_skb) { 2003 ret = -ENOENT; 2004 goto out; 2005 } 2006 2007 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 2008 2009 tdls_dbg(sdata, 2010 "TDLS ch switch request received from %pM ch %d width %d\n", 2011 tf->sa, params.chandef->chan->center_freq, 2012 params.chandef->width); 2013 out: 2014 dev_kfree_skb_any(params.tmpl_skb); 2015 free: 2016 kfree(elems); 2017 return ret; 2018 } 2019 2020 void 2021 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata, 2022 struct sk_buff *skb) 2023 { 2024 struct ieee80211_tdls_data *tf = (void *)skb->data; 2025 struct wiphy *wiphy = sdata->local->hw.wiphy; 2026 2027 lockdep_assert_wiphy(wiphy); 2028 2029 /* make sure the driver supports it */ 2030 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH)) 2031 return; 2032 2033 /* we want to access the entire packet */ 2034 if (skb_linearize(skb)) 2035 return; 2036 /* 2037 * The packet/size was already validated by mac80211 Rx path, only look 2038 * at the action type. 2039 */ 2040 switch (tf->action_code) { 2041 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 2042 ieee80211_process_tdls_channel_switch_req(sdata, skb); 2043 break; 2044 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 2045 ieee80211_process_tdls_channel_switch_resp(sdata, skb); 2046 break; 2047 default: 2048 WARN_ON_ONCE(1); 2049 return; 2050 } 2051 } 2052 2053 void ieee80211_teardown_tdls_peers(struct ieee80211_link_data *link) 2054 { 2055 struct ieee80211_sub_if_data *sdata = link->sdata; 2056 struct sta_info *sta; 2057 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED; 2058 2059 rcu_read_lock(); 2060 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 2061 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 2062 !test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2063 continue; 2064 2065 if (sta->deflink.link_id != link->link_id) 2066 continue; 2067 2068 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr, 2069 NL80211_TDLS_TEARDOWN, reason, 2070 GFP_ATOMIC); 2071 } 2072 rcu_read_unlock(); 2073 } 2074 2075 void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata, 2076 const u8 *peer, u16 reason) 2077 { 2078 struct ieee80211_sta *sta; 2079 2080 rcu_read_lock(); 2081 sta = ieee80211_find_sta(&sdata->vif, peer); 2082 if (!sta || !sta->tdls) { 2083 rcu_read_unlock(); 2084 return; 2085 } 2086 rcu_read_unlock(); 2087 2088 tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n", 2089 peer, reason, 2090 ieee80211_get_reason_code_string(reason)); 2091 2092 ieee80211_tdls_oper_request(&sdata->vif, peer, 2093 NL80211_TDLS_TEARDOWN, 2094 WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE, 2095 GFP_ATOMIC); 2096 } 2097