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, 2021-2024 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, 0, WLAN_EID_SUPP_RATES); 386 ieee80211_put_srates_elem(skb, sband, 0, 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 mgmt = skb_put_zero(skb, 24); 883 memcpy(mgmt->da, peer, ETH_ALEN); 884 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 885 memcpy(mgmt->bssid, link->u.mgd.bssid, ETH_ALEN); 886 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 887 IEEE80211_STYPE_ACTION); 888 889 switch (action_code) { 890 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 891 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp)); 892 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC; 893 mgmt->u.action.u.tdls_discover_resp.action_code = 894 WLAN_PUB_ACTION_TDLS_DISCOVER_RES; 895 mgmt->u.action.u.tdls_discover_resp.dialog_token = 896 dialog_token; 897 mgmt->u.action.u.tdls_discover_resp.capability = 898 cpu_to_le16(ieee80211_get_tdls_sta_capab(link, 899 status_code)); 900 break; 901 default: 902 return -EINVAL; 903 } 904 905 return 0; 906 } 907 908 static struct sk_buff * 909 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata, 910 const u8 *peer, int link_id, 911 u8 action_code, u8 dialog_token, 912 u16 status_code, bool initiator, 913 const u8 *extra_ies, size_t extra_ies_len, 914 u8 oper_class, 915 struct cfg80211_chan_def *chandef) 916 { 917 struct ieee80211_local *local = sdata->local; 918 struct sk_buff *skb; 919 int ret; 920 struct ieee80211_link_data *link; 921 922 link_id = link_id >= 0 ? link_id : 0; 923 rcu_read_lock(); 924 link = rcu_dereference(sdata->link[link_id]); 925 if (WARN_ON(!link)) 926 goto unlock; 927 928 skb = netdev_alloc_skb(sdata->dev, 929 local->hw.extra_tx_headroom + 930 max(sizeof(struct ieee80211_mgmt), 931 sizeof(struct ieee80211_tdls_data)) + 932 50 + /* supported rates */ 933 10 + /* ext capab */ 934 26 + /* max(WMM-info, WMM-param) */ 935 2 + max(sizeof(struct ieee80211_ht_cap), 936 sizeof(struct ieee80211_ht_operation)) + 937 2 + max(sizeof(struct ieee80211_vht_cap), 938 sizeof(struct ieee80211_vht_operation)) + 939 2 + 1 + sizeof(struct ieee80211_he_cap_elem) + 940 sizeof(struct ieee80211_he_mcs_nss_supp) + 941 IEEE80211_HE_PPE_THRES_MAX_LEN + 942 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) + 943 2 + 1 + sizeof(struct ieee80211_eht_cap_elem) + 944 sizeof(struct ieee80211_eht_mcs_nss_supp) + 945 IEEE80211_EHT_PPE_THRES_MAX_LEN + 946 50 + /* supported channels */ 947 3 + /* 40/20 BSS coex */ 948 4 + /* AID */ 949 4 + /* oper classes */ 950 extra_ies_len + 951 sizeof(struct ieee80211_tdls_lnkie)); 952 if (!skb) 953 goto unlock; 954 955 skb_reserve(skb, local->hw.extra_tx_headroom); 956 957 switch (action_code) { 958 case WLAN_TDLS_SETUP_REQUEST: 959 case WLAN_TDLS_SETUP_RESPONSE: 960 case WLAN_TDLS_SETUP_CONFIRM: 961 case WLAN_TDLS_TEARDOWN: 962 case WLAN_TDLS_DISCOVERY_REQUEST: 963 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 964 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 965 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy, 966 sdata->dev, link, peer, 967 action_code, dialog_token, 968 status_code, skb); 969 break; 970 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 971 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev, 972 peer, link, action_code, 973 dialog_token, status_code, 974 skb); 975 break; 976 default: 977 ret = -EOPNOTSUPP; 978 break; 979 } 980 981 if (ret < 0) 982 goto fail; 983 984 ieee80211_tdls_add_ies(link, skb, peer, action_code, status_code, 985 initiator, extra_ies, extra_ies_len, oper_class, 986 chandef); 987 rcu_read_unlock(); 988 return skb; 989 990 fail: 991 dev_kfree_skb(skb); 992 unlock: 993 rcu_read_unlock(); 994 return NULL; 995 } 996 997 static int 998 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev, 999 const u8 *peer, int link_id, 1000 u8 action_code, u8 dialog_token, 1001 u16 status_code, u32 peer_capability, 1002 bool initiator, const u8 *extra_ies, 1003 size_t extra_ies_len, u8 oper_class, 1004 struct cfg80211_chan_def *chandef) 1005 { 1006 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1007 struct sk_buff *skb = NULL; 1008 struct sta_info *sta; 1009 u32 flags = 0; 1010 int ret = 0; 1011 1012 rcu_read_lock(); 1013 sta = sta_info_get(sdata, peer); 1014 1015 /* infer the initiator if we can, to support old userspace */ 1016 switch (action_code) { 1017 case WLAN_TDLS_SETUP_REQUEST: 1018 if (sta) { 1019 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); 1020 sta->sta.tdls_initiator = false; 1021 } 1022 fallthrough; 1023 case WLAN_TDLS_SETUP_CONFIRM: 1024 case WLAN_TDLS_DISCOVERY_REQUEST: 1025 initiator = true; 1026 break; 1027 case WLAN_TDLS_SETUP_RESPONSE: 1028 /* 1029 * In some testing scenarios, we send a request and response. 1030 * Make the last packet sent take effect for the initiator 1031 * value. 1032 */ 1033 if (sta) { 1034 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); 1035 sta->sta.tdls_initiator = true; 1036 } 1037 fallthrough; 1038 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 1039 initiator = false; 1040 break; 1041 case WLAN_TDLS_TEARDOWN: 1042 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 1043 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 1044 /* any value is ok */ 1045 break; 1046 default: 1047 ret = -EOPNOTSUPP; 1048 break; 1049 } 1050 1051 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR)) 1052 initiator = true; 1053 1054 rcu_read_unlock(); 1055 if (ret < 0) 1056 goto fail; 1057 1058 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, 1059 link_id, action_code, 1060 dialog_token, status_code, 1061 initiator, extra_ies, 1062 extra_ies_len, oper_class, 1063 chandef); 1064 if (!skb) { 1065 ret = -EINVAL; 1066 goto fail; 1067 } 1068 1069 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) { 1070 ieee80211_tx_skb_tid(sdata, skb, 7, link_id); 1071 return 0; 1072 } 1073 1074 /* 1075 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise 1076 * we should default to AC_VI. 1077 */ 1078 switch (action_code) { 1079 case WLAN_TDLS_SETUP_REQUEST: 1080 case WLAN_TDLS_SETUP_RESPONSE: 1081 skb->priority = 256 + 2; 1082 break; 1083 default: 1084 skb->priority = 256 + 5; 1085 break; 1086 } 1087 1088 /* 1089 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress. 1090 * Later, if no ACK is returned from peer, we will re-send the teardown 1091 * packet through the AP. 1092 */ 1093 if ((action_code == WLAN_TDLS_TEARDOWN) && 1094 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) { 1095 bool try_resend; /* Should we keep skb for possible resend */ 1096 1097 /* If not sending directly to peer - no point in keeping skb */ 1098 rcu_read_lock(); 1099 sta = sta_info_get(sdata, peer); 1100 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1101 rcu_read_unlock(); 1102 1103 spin_lock_bh(&sdata->u.mgd.teardown_lock); 1104 if (try_resend && !sdata->u.mgd.teardown_skb) { 1105 /* Mark it as requiring TX status callback */ 1106 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | 1107 IEEE80211_TX_INTFL_MLME_CONN_TX; 1108 1109 /* 1110 * skb is copied since mac80211 will later set 1111 * properties that might not be the same as the AP, 1112 * such as encryption, QoS, addresses, etc. 1113 * 1114 * No problem if skb_copy() fails, so no need to check. 1115 */ 1116 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC); 1117 sdata->u.mgd.orig_teardown_skb = skb; 1118 } 1119 spin_unlock_bh(&sdata->u.mgd.teardown_lock); 1120 } 1121 1122 /* disable bottom halves when entering the Tx path */ 1123 local_bh_disable(); 1124 __ieee80211_subif_start_xmit(skb, dev, flags, 1125 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 1126 local_bh_enable(); 1127 1128 return ret; 1129 1130 fail: 1131 dev_kfree_skb(skb); 1132 return ret; 1133 } 1134 1135 static int 1136 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev, 1137 const u8 *peer, int link_id, 1138 u8 action_code, u8 dialog_token, 1139 u16 status_code, u32 peer_capability, bool initiator, 1140 const u8 *extra_ies, size_t extra_ies_len) 1141 { 1142 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1143 struct ieee80211_local *local = sdata->local; 1144 enum ieee80211_smps_mode smps_mode = 1145 sdata->deflink.u.mgd.driver_smps_mode; 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 if (status_code == 0) { 1173 rcu_read_lock(); 1174 if (!sta_info_get(sdata, peer)) { 1175 rcu_read_unlock(); 1176 ret = -ENOLINK; 1177 goto out_unlock; 1178 } 1179 rcu_read_unlock(); 1180 } 1181 1182 ieee80211_flush_queues(local, sdata, false); 1183 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN); 1184 1185 /* we cannot take the mutex while preparing the setup packet */ 1186 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1187 link_id, action_code, 1188 dialog_token, status_code, 1189 peer_capability, initiator, 1190 extra_ies, extra_ies_len, 0, 1191 NULL); 1192 if (ret < 0) { 1193 eth_zero_addr(sdata->u.mgd.tdls_peer); 1194 return ret; 1195 } 1196 1197 wiphy_delayed_work_queue(sdata->local->hw.wiphy, 1198 &sdata->u.mgd.tdls_peer_del_work, 1199 TDLS_PEER_SETUP_TIMEOUT); 1200 return 0; 1201 1202 out_unlock: 1203 return ret; 1204 } 1205 1206 static int 1207 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev, 1208 const u8 *peer, int link_id, 1209 u8 action_code, u8 dialog_token, 1210 u16 status_code, u32 peer_capability, 1211 bool initiator, const u8 *extra_ies, 1212 size_t extra_ies_len) 1213 { 1214 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1215 struct ieee80211_local *local = sdata->local; 1216 struct sta_info *sta; 1217 int ret; 1218 1219 /* 1220 * No packets can be transmitted to the peer via the AP during setup - 1221 * the STA is set as a TDLS peer, but is not authorized. 1222 * During teardown, we prevent direct transmissions by stopping the 1223 * queues and flushing all direct packets. 1224 */ 1225 ieee80211_stop_vif_queues(local, sdata, 1226 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1227 ieee80211_flush_queues(local, sdata, false); 1228 1229 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1230 link_id, action_code, 1231 dialog_token, status_code, 1232 peer_capability, initiator, 1233 extra_ies, extra_ies_len, 0, 1234 NULL); 1235 if (ret < 0) 1236 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n", 1237 ret); 1238 1239 /* 1240 * Remove the STA AUTH flag to force further traffic through the AP. If 1241 * the STA was unreachable, it was already removed. 1242 */ 1243 rcu_read_lock(); 1244 sta = sta_info_get(sdata, peer); 1245 if (sta) 1246 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1247 rcu_read_unlock(); 1248 1249 ieee80211_wake_vif_queues(local, sdata, 1250 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1251 1252 return 0; 1253 } 1254 1255 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev, 1256 const u8 *peer, int link_id, 1257 u8 action_code, u8 dialog_token, u16 status_code, 1258 u32 peer_capability, bool initiator, 1259 const u8 *extra_ies, size_t extra_ies_len) 1260 { 1261 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1262 int ret; 1263 1264 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1265 return -EOPNOTSUPP; 1266 1267 /* make sure we are in managed mode, and associated */ 1268 if (sdata->vif.type != NL80211_IFTYPE_STATION || 1269 !sdata->u.mgd.associated) 1270 return -EINVAL; 1271 1272 switch (action_code) { 1273 case WLAN_TDLS_SETUP_REQUEST: 1274 case WLAN_TDLS_SETUP_RESPONSE: 1275 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, 1276 link_id, action_code, 1277 dialog_token, status_code, 1278 peer_capability, initiator, 1279 extra_ies, extra_ies_len); 1280 break; 1281 case WLAN_TDLS_TEARDOWN: 1282 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, link_id, 1283 action_code, dialog_token, 1284 status_code, 1285 peer_capability, initiator, 1286 extra_ies, extra_ies_len); 1287 break; 1288 case WLAN_TDLS_DISCOVERY_REQUEST: 1289 /* 1290 * Protect the discovery so we can hear the TDLS discovery 1291 * response frame. It is transmitted directly and not buffered 1292 * by the AP. 1293 */ 1294 drv_mgd_protect_tdls_discover(sdata->local, sdata, link_id); 1295 fallthrough; 1296 case WLAN_TDLS_SETUP_CONFIRM: 1297 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 1298 /* no special handling */ 1299 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1300 link_id, action_code, 1301 dialog_token, 1302 status_code, 1303 peer_capability, 1304 initiator, extra_ies, 1305 extra_ies_len, 0, NULL); 1306 break; 1307 default: 1308 ret = -EOPNOTSUPP; 1309 break; 1310 } 1311 1312 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM link_id %d status %d\n", 1313 action_code, peer, link_id, ret); 1314 return ret; 1315 } 1316 1317 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata, 1318 struct sta_info *sta) 1319 { 1320 struct ieee80211_local *local = sdata->local; 1321 struct ieee80211_chanctx_conf *conf; 1322 struct ieee80211_chanctx *ctx; 1323 enum nl80211_chan_width width; 1324 struct ieee80211_supported_band *sband; 1325 1326 lockdep_assert_wiphy(local->hw.wiphy); 1327 1328 conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf, 1329 lockdep_is_held(&local->hw.wiphy->mtx)); 1330 if (conf) { 1331 width = conf->def.width; 1332 sband = local->hw.wiphy->bands[conf->def.chan->band]; 1333 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1334 ieee80211_recalc_chanctx_chantype(local, ctx); 1335 1336 /* if width changed and a peer is given, update its BW */ 1337 if (width != conf->def.width && sta && 1338 test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) { 1339 enum ieee80211_sta_rx_bandwidth bw; 1340 1341 bw = ieee80211_chan_width_to_rx_bw(conf->def.width); 1342 bw = min(bw, ieee80211_sta_cap_rx_bw(&sta->deflink)); 1343 if (bw != sta->sta.deflink.bandwidth) { 1344 sta->sta.deflink.bandwidth = bw; 1345 rate_control_rate_update(local, sband, 1346 &sta->deflink, 1347 IEEE80211_RC_BW_CHANGED); 1348 /* 1349 * if a TDLS peer BW was updated, we need to 1350 * recalc the chandef width again, to get the 1351 * correct chanctx min_def 1352 */ 1353 ieee80211_recalc_chanctx_chantype(local, ctx); 1354 } 1355 } 1356 1357 } 1358 } 1359 1360 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata) 1361 { 1362 struct sta_info *sta; 1363 bool result = false; 1364 1365 rcu_read_lock(); 1366 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 1367 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 1368 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 1369 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) || 1370 !sta->sta.deflink.ht_cap.ht_supported) 1371 continue; 1372 result = true; 1373 break; 1374 } 1375 rcu_read_unlock(); 1376 1377 return result; 1378 } 1379 1380 static void 1381 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata, 1382 struct sta_info *sta) 1383 { 1384 bool tdls_ht; 1385 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | 1386 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | 1387 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; 1388 u16 opmode; 1389 1390 /* Nothing to do if the BSS connection uses (at least) HT */ 1391 if (sdata->deflink.u.mgd.conn.mode >= IEEE80211_CONN_MODE_HT) 1392 return; 1393 1394 tdls_ht = (sta && sta->sta.deflink.ht_cap.ht_supported) || 1395 iee80211_tdls_have_ht_peers(sdata); 1396 1397 opmode = sdata->vif.bss_conf.ht_operation_mode; 1398 1399 if (tdls_ht) 1400 opmode |= protection; 1401 else 1402 opmode &= ~protection; 1403 1404 if (opmode == sdata->vif.bss_conf.ht_operation_mode) 1405 return; 1406 1407 sdata->vif.bss_conf.ht_operation_mode = opmode; 1408 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1409 BSS_CHANGED_HT); 1410 } 1411 1412 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev, 1413 const u8 *peer, enum nl80211_tdls_operation oper) 1414 { 1415 struct sta_info *sta; 1416 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1417 struct ieee80211_local *local = sdata->local; 1418 int ret; 1419 1420 lockdep_assert_wiphy(local->hw.wiphy); 1421 1422 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1423 return -EOPNOTSUPP; 1424 1425 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1426 return -EINVAL; 1427 1428 switch (oper) { 1429 case NL80211_TDLS_ENABLE_LINK: 1430 case NL80211_TDLS_DISABLE_LINK: 1431 break; 1432 case NL80211_TDLS_TEARDOWN: 1433 case NL80211_TDLS_SETUP: 1434 case NL80211_TDLS_DISCOVERY_REQ: 1435 /* We don't support in-driver setup/teardown/discovery */ 1436 return -EOPNOTSUPP; 1437 } 1438 1439 /* protect possible bss_conf changes and avoid concurrency in 1440 * ieee80211_bss_info_change_notify() 1441 */ 1442 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer); 1443 1444 switch (oper) { 1445 case NL80211_TDLS_ENABLE_LINK: 1446 if (sdata->vif.bss_conf.csa_active) { 1447 tdls_dbg(sdata, "TDLS: disallow link during CSA\n"); 1448 return -EBUSY; 1449 } 1450 1451 sta = sta_info_get(sdata, peer); 1452 if (!sta) 1453 return -ENOLINK; 1454 1455 iee80211_tdls_recalc_chanctx(sdata, sta); 1456 iee80211_tdls_recalc_ht_protection(sdata, sta); 1457 1458 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1459 1460 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) || 1461 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)); 1462 break; 1463 case NL80211_TDLS_DISABLE_LINK: 1464 /* 1465 * The teardown message in ieee80211_tdls_mgmt_teardown() was 1466 * created while the queues were stopped, so it might still be 1467 * pending. Before flushing the queues we need to be sure the 1468 * message is handled by the tasklet handling pending messages, 1469 * otherwise we might start destroying the station before 1470 * sending the teardown packet. 1471 * Note that this only forces the tasklet to flush pendings - 1472 * not to stop the tasklet from rescheduling itself. 1473 */ 1474 tasklet_kill(&local->tx_pending_tasklet); 1475 /* flush a potentially queued teardown packet */ 1476 ieee80211_flush_queues(local, sdata, false); 1477 1478 ret = sta_info_destroy_addr(sdata, peer); 1479 1480 iee80211_tdls_recalc_ht_protection(sdata, NULL); 1481 1482 iee80211_tdls_recalc_chanctx(sdata, NULL); 1483 if (ret) 1484 return ret; 1485 break; 1486 default: 1487 return -EOPNOTSUPP; 1488 } 1489 1490 if (ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1491 wiphy_delayed_work_cancel(sdata->local->hw.wiphy, 1492 &sdata->u.mgd.tdls_peer_del_work); 1493 eth_zero_addr(sdata->u.mgd.tdls_peer); 1494 } 1495 1496 wiphy_work_queue(sdata->local->hw.wiphy, 1497 &sdata->deflink.u.mgd.request_smps_work); 1498 1499 return 0; 1500 } 1501 1502 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer, 1503 enum nl80211_tdls_operation oper, 1504 u16 reason_code, gfp_t gfp) 1505 { 1506 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1507 1508 if (vif->type != NL80211_IFTYPE_STATION || !vif->cfg.assoc) { 1509 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n", 1510 oper); 1511 return; 1512 } 1513 1514 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp); 1515 } 1516 EXPORT_SYMBOL(ieee80211_tdls_oper_request); 1517 1518 static void 1519 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout) 1520 { 1521 struct ieee80211_ch_switch_timing *ch_sw; 1522 1523 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING; 1524 *buf++ = sizeof(struct ieee80211_ch_switch_timing); 1525 1526 ch_sw = (void *)buf; 1527 ch_sw->switch_time = cpu_to_le16(switch_time); 1528 ch_sw->switch_timeout = cpu_to_le16(switch_timeout); 1529 } 1530 1531 /* find switch timing IE in SKB ready for Tx */ 1532 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb) 1533 { 1534 struct ieee80211_tdls_data *tf; 1535 const u8 *ie_start; 1536 1537 /* 1538 * Get the offset for the new location of the switch timing IE. 1539 * The SKB network header will now point to the "payload_type" 1540 * element of the TDLS data frame struct. 1541 */ 1542 tf = container_of(skb->data + skb_network_offset(skb), 1543 struct ieee80211_tdls_data, payload_type); 1544 ie_start = tf->u.chan_switch_req.variable; 1545 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start, 1546 skb->len - (ie_start - skb->data)); 1547 } 1548 1549 static struct sk_buff * 1550 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class, 1551 struct cfg80211_chan_def *chandef, 1552 u32 *ch_sw_tm_ie_offset) 1553 { 1554 struct ieee80211_sub_if_data *sdata = sta->sdata; 1555 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) + 1556 2 + sizeof(struct ieee80211_ch_switch_timing)]; 1557 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing); 1558 u8 *pos = extra_ies; 1559 struct sk_buff *skb; 1560 int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0; 1561 1562 /* 1563 * if chandef points to a wide channel add a Secondary-Channel 1564 * Offset information element 1565 */ 1566 if (chandef->width == NL80211_CHAN_WIDTH_40) { 1567 struct ieee80211_sec_chan_offs_ie *sec_chan_ie; 1568 bool ht40plus; 1569 1570 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; 1571 *pos++ = sizeof(*sec_chan_ie); 1572 sec_chan_ie = (void *)pos; 1573 1574 ht40plus = cfg80211_get_chandef_type(chandef) == 1575 NL80211_CHAN_HT40PLUS; 1576 sec_chan_ie->sec_chan_offs = ht40plus ? 1577 IEEE80211_HT_PARAM_CHA_SEC_ABOVE : 1578 IEEE80211_HT_PARAM_CHA_SEC_BELOW; 1579 pos += sizeof(*sec_chan_ie); 1580 1581 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie); 1582 } 1583 1584 /* just set the values to 0, this is a template */ 1585 iee80211_tdls_add_ch_switch_timing(pos, 0, 0); 1586 1587 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1588 link_id, 1589 WLAN_TDLS_CHANNEL_SWITCH_REQUEST, 1590 0, 0, !sta->sta.tdls_initiator, 1591 extra_ies, extra_ies_len, 1592 oper_class, chandef); 1593 if (!skb) 1594 return NULL; 1595 1596 skb = ieee80211_build_data_template(sdata, skb, 0); 1597 if (IS_ERR(skb)) { 1598 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n"); 1599 return NULL; 1600 } 1601 1602 if (ch_sw_tm_ie_offset) { 1603 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1604 1605 if (!tm_ie) { 1606 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n"); 1607 dev_kfree_skb_any(skb); 1608 return NULL; 1609 } 1610 1611 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1612 } 1613 1614 tdls_dbg(sdata, 1615 "TDLS channel switch request template for %pM ch %d width %d\n", 1616 sta->sta.addr, chandef->chan->center_freq, chandef->width); 1617 return skb; 1618 } 1619 1620 int 1621 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev, 1622 const u8 *addr, u8 oper_class, 1623 struct cfg80211_chan_def *chandef) 1624 { 1625 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1626 struct ieee80211_local *local = sdata->local; 1627 struct sta_info *sta; 1628 struct sk_buff *skb = NULL; 1629 u32 ch_sw_tm_ie; 1630 int ret; 1631 1632 lockdep_assert_wiphy(local->hw.wiphy); 1633 1634 if (chandef->chan->freq_offset) 1635 /* this may work, but is untested */ 1636 return -EOPNOTSUPP; 1637 1638 sta = sta_info_get(sdata, addr); 1639 if (!sta) { 1640 tdls_dbg(sdata, 1641 "Invalid TDLS peer %pM for channel switch request\n", 1642 addr); 1643 ret = -ENOENT; 1644 goto out; 1645 } 1646 1647 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) { 1648 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n", 1649 addr); 1650 ret = -EOPNOTSUPP; 1651 goto out; 1652 } 1653 1654 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef, 1655 &ch_sw_tm_ie); 1656 if (!skb) { 1657 ret = -ENOENT; 1658 goto out; 1659 } 1660 1661 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class, 1662 chandef, skb, ch_sw_tm_ie); 1663 if (!ret) 1664 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1665 1666 out: 1667 dev_kfree_skb_any(skb); 1668 return ret; 1669 } 1670 1671 void 1672 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy, 1673 struct net_device *dev, 1674 const u8 *addr) 1675 { 1676 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1677 struct ieee80211_local *local = sdata->local; 1678 struct sta_info *sta; 1679 1680 lockdep_assert_wiphy(local->hw.wiphy); 1681 1682 sta = sta_info_get(sdata, addr); 1683 if (!sta) { 1684 tdls_dbg(sdata, 1685 "Invalid TDLS peer %pM for channel switch cancel\n", 1686 addr); 1687 return; 1688 } 1689 1690 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) { 1691 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n", 1692 addr); 1693 return; 1694 } 1695 1696 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta); 1697 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1698 } 1699 1700 static struct sk_buff * 1701 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta, 1702 u32 *ch_sw_tm_ie_offset) 1703 { 1704 struct ieee80211_sub_if_data *sdata = sta->sdata; 1705 struct sk_buff *skb; 1706 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)]; 1707 int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0; 1708 1709 /* initial timing are always zero in the template */ 1710 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0); 1711 1712 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1713 link_id, 1714 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE, 1715 0, 0, !sta->sta.tdls_initiator, 1716 extra_ies, sizeof(extra_ies), 0, NULL); 1717 if (!skb) 1718 return NULL; 1719 1720 skb = ieee80211_build_data_template(sdata, skb, 0); 1721 if (IS_ERR(skb)) { 1722 tdls_dbg(sdata, 1723 "Failed building TDLS channel switch resp frame\n"); 1724 return NULL; 1725 } 1726 1727 if (ch_sw_tm_ie_offset) { 1728 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1729 1730 if (!tm_ie) { 1731 tdls_dbg(sdata, 1732 "No switch timing IE in TDLS switch resp\n"); 1733 dev_kfree_skb_any(skb); 1734 return NULL; 1735 } 1736 1737 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1738 } 1739 1740 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n", 1741 sta->sta.addr); 1742 return skb; 1743 } 1744 1745 static int 1746 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata, 1747 struct sk_buff *skb) 1748 { 1749 struct ieee80211_local *local = sdata->local; 1750 struct ieee802_11_elems *elems = NULL; 1751 struct sta_info *sta; 1752 struct ieee80211_tdls_data *tf = (void *)skb->data; 1753 bool local_initiator; 1754 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1755 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable); 1756 struct ieee80211_tdls_ch_sw_params params = {}; 1757 int ret; 1758 1759 lockdep_assert_wiphy(local->hw.wiphy); 1760 1761 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 1762 params.timestamp = rx_status->device_timestamp; 1763 1764 if (skb->len < baselen) { 1765 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n", 1766 skb->len); 1767 return -EINVAL; 1768 } 1769 1770 sta = sta_info_get(sdata, tf->sa); 1771 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1772 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1773 tf->sa); 1774 ret = -EINVAL; 1775 goto out; 1776 } 1777 1778 params.sta = &sta->sta; 1779 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code); 1780 if (params.status != 0) { 1781 ret = 0; 1782 goto call_drv; 1783 } 1784 1785 elems = ieee802_11_parse_elems(tf->u.chan_switch_resp.variable, 1786 skb->len - baselen, false, NULL); 1787 if (!elems) { 1788 ret = -ENOMEM; 1789 goto out; 1790 } 1791 1792 if (elems->parse_error) { 1793 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n"); 1794 ret = -EINVAL; 1795 goto out; 1796 } 1797 1798 if (!elems->ch_sw_timing || !elems->lnk_id) { 1799 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n"); 1800 ret = -EINVAL; 1801 goto out; 1802 } 1803 1804 /* validate the initiator is set correctly */ 1805 local_initiator = 1806 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1807 if (local_initiator == sta->sta.tdls_initiator) { 1808 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1809 ret = -EINVAL; 1810 goto out; 1811 } 1812 1813 params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time); 1814 params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout); 1815 1816 params.tmpl_skb = 1817 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie); 1818 if (!params.tmpl_skb) { 1819 ret = -ENOENT; 1820 goto out; 1821 } 1822 1823 ret = 0; 1824 call_drv: 1825 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1826 1827 tdls_dbg(sdata, 1828 "TDLS channel switch response received from %pM status %d\n", 1829 tf->sa, params.status); 1830 1831 out: 1832 dev_kfree_skb_any(params.tmpl_skb); 1833 kfree(elems); 1834 return ret; 1835 } 1836 1837 static int 1838 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata, 1839 struct sk_buff *skb) 1840 { 1841 struct ieee80211_local *local = sdata->local; 1842 struct ieee802_11_elems *elems; 1843 struct cfg80211_chan_def chandef; 1844 struct ieee80211_channel *chan; 1845 enum nl80211_channel_type chan_type; 1846 int freq; 1847 u8 target_channel, oper_class; 1848 bool local_initiator; 1849 struct sta_info *sta; 1850 enum nl80211_band band; 1851 struct ieee80211_tdls_data *tf = (void *)skb->data; 1852 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1853 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable); 1854 struct ieee80211_tdls_ch_sw_params params = {}; 1855 int ret = 0; 1856 1857 lockdep_assert_wiphy(local->hw.wiphy); 1858 1859 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 1860 params.timestamp = rx_status->device_timestamp; 1861 1862 if (skb->len < baselen) { 1863 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n", 1864 skb->len); 1865 return -EINVAL; 1866 } 1867 1868 target_channel = tf->u.chan_switch_req.target_channel; 1869 oper_class = tf->u.chan_switch_req.oper_class; 1870 1871 /* 1872 * We can't easily infer the channel band. The operating class is 1873 * ambiguous - there are multiple tables (US/Europe/JP/Global). The 1874 * solution here is to treat channels with number >14 as 5GHz ones, 1875 * and specifically check for the (oper_class, channel) combinations 1876 * where this doesn't hold. These are thankfully unique according to 1877 * IEEE802.11-2012. 1878 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as 1879 * valid here. 1880 */ 1881 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 || 1882 oper_class == 4 || oper_class == 5 || oper_class == 6) && 1883 target_channel < 14) 1884 band = NL80211_BAND_5GHZ; 1885 else 1886 band = target_channel < 14 ? NL80211_BAND_2GHZ : 1887 NL80211_BAND_5GHZ; 1888 1889 freq = ieee80211_channel_to_frequency(target_channel, band); 1890 if (freq == 0) { 1891 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n", 1892 target_channel); 1893 return -EINVAL; 1894 } 1895 1896 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq); 1897 if (!chan) { 1898 tdls_dbg(sdata, 1899 "Unsupported channel for TDLS chan switch: %d\n", 1900 target_channel); 1901 return -EINVAL; 1902 } 1903 1904 elems = ieee802_11_parse_elems(tf->u.chan_switch_req.variable, 1905 skb->len - baselen, false, NULL); 1906 if (!elems) 1907 return -ENOMEM; 1908 1909 if (elems->parse_error) { 1910 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n"); 1911 ret = -EINVAL; 1912 goto free; 1913 } 1914 1915 if (!elems->ch_sw_timing || !elems->lnk_id) { 1916 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n"); 1917 ret = -EINVAL; 1918 goto free; 1919 } 1920 1921 if (!elems->sec_chan_offs) { 1922 chan_type = NL80211_CHAN_HT20; 1923 } else { 1924 switch (elems->sec_chan_offs->sec_chan_offs) { 1925 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 1926 chan_type = NL80211_CHAN_HT40PLUS; 1927 break; 1928 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 1929 chan_type = NL80211_CHAN_HT40MINUS; 1930 break; 1931 default: 1932 chan_type = NL80211_CHAN_HT20; 1933 break; 1934 } 1935 } 1936 1937 cfg80211_chandef_create(&chandef, chan, chan_type); 1938 1939 /* we will be active on the TDLS link */ 1940 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef, 1941 sdata->wdev.iftype)) { 1942 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n"); 1943 ret = -EINVAL; 1944 goto free; 1945 } 1946 1947 sta = sta_info_get(sdata, tf->sa); 1948 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1949 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1950 tf->sa); 1951 ret = -EINVAL; 1952 goto out; 1953 } 1954 1955 params.sta = &sta->sta; 1956 1957 /* validate the initiator is set correctly */ 1958 local_initiator = 1959 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1960 if (local_initiator == sta->sta.tdls_initiator) { 1961 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1962 ret = -EINVAL; 1963 goto out; 1964 } 1965 1966 /* peer should have known better */ 1967 if (!sta->sta.deflink.ht_cap.ht_supported && elems->sec_chan_offs && 1968 elems->sec_chan_offs->sec_chan_offs) { 1969 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n"); 1970 ret = -EOPNOTSUPP; 1971 goto out; 1972 } 1973 1974 params.chandef = &chandef; 1975 params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time); 1976 params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout); 1977 1978 params.tmpl_skb = 1979 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, 1980 ¶ms.ch_sw_tm_ie); 1981 if (!params.tmpl_skb) { 1982 ret = -ENOENT; 1983 goto out; 1984 } 1985 1986 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1987 1988 tdls_dbg(sdata, 1989 "TDLS ch switch request received from %pM ch %d width %d\n", 1990 tf->sa, params.chandef->chan->center_freq, 1991 params.chandef->width); 1992 out: 1993 dev_kfree_skb_any(params.tmpl_skb); 1994 free: 1995 kfree(elems); 1996 return ret; 1997 } 1998 1999 void 2000 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata, 2001 struct sk_buff *skb) 2002 { 2003 struct ieee80211_tdls_data *tf = (void *)skb->data; 2004 struct wiphy *wiphy = sdata->local->hw.wiphy; 2005 2006 lockdep_assert_wiphy(wiphy); 2007 2008 /* make sure the driver supports it */ 2009 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH)) 2010 return; 2011 2012 /* we want to access the entire packet */ 2013 if (skb_linearize(skb)) 2014 return; 2015 /* 2016 * The packet/size was already validated by mac80211 Rx path, only look 2017 * at the action type. 2018 */ 2019 switch (tf->action_code) { 2020 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 2021 ieee80211_process_tdls_channel_switch_req(sdata, skb); 2022 break; 2023 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 2024 ieee80211_process_tdls_channel_switch_resp(sdata, skb); 2025 break; 2026 default: 2027 WARN_ON_ONCE(1); 2028 return; 2029 } 2030 } 2031 2032 void ieee80211_teardown_tdls_peers(struct ieee80211_link_data *link) 2033 { 2034 struct ieee80211_sub_if_data *sdata = link->sdata; 2035 struct sta_info *sta; 2036 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED; 2037 2038 rcu_read_lock(); 2039 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 2040 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 2041 !test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2042 continue; 2043 2044 if (sta->deflink.link_id != link->link_id) 2045 continue; 2046 2047 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr, 2048 NL80211_TDLS_TEARDOWN, reason, 2049 GFP_ATOMIC); 2050 } 2051 rcu_read_unlock(); 2052 } 2053 2054 void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata, 2055 const u8 *peer, u16 reason) 2056 { 2057 struct ieee80211_sta *sta; 2058 2059 rcu_read_lock(); 2060 sta = ieee80211_find_sta(&sdata->vif, peer); 2061 if (!sta || !sta->tdls) { 2062 rcu_read_unlock(); 2063 return; 2064 } 2065 rcu_read_unlock(); 2066 2067 tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n", 2068 peer, reason, 2069 ieee80211_get_reason_code_string(reason)); 2070 2071 ieee80211_tdls_oper_request(&sdata->vif, peer, 2072 NL80211_TDLS_TEARDOWN, 2073 WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE, 2074 GFP_ATOMIC); 2075 } 2076