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, NULL); 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 int ret; 1146 1147 /* don't support setup with forced SMPS mode that's not off */ 1148 if (smps_mode != IEEE80211_SMPS_AUTOMATIC && 1149 smps_mode != IEEE80211_SMPS_OFF) { 1150 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n", 1151 smps_mode); 1152 return -EOPNOTSUPP; 1153 } 1154 1155 lockdep_assert_wiphy(local->hw.wiphy); 1156 1157 /* we don't support concurrent TDLS peer setups */ 1158 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) && 1159 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1160 ret = -EBUSY; 1161 goto out_unlock; 1162 } 1163 1164 /* 1165 * make sure we have a STA representing the peer so we drop or buffer 1166 * non-TDLS-setup frames to the peer. We can't send other packets 1167 * during setup through the AP path. 1168 * Allow error packets to be sent - sometimes we don't even add a STA 1169 * before failing the setup. 1170 */ 1171 if (status_code == 0) { 1172 rcu_read_lock(); 1173 if (!sta_info_get(sdata, peer)) { 1174 rcu_read_unlock(); 1175 ret = -ENOLINK; 1176 goto out_unlock; 1177 } 1178 rcu_read_unlock(); 1179 } 1180 1181 ieee80211_flush_queues(local, sdata, false); 1182 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN); 1183 1184 /* we cannot take the mutex while preparing the setup packet */ 1185 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1186 link_id, action_code, 1187 dialog_token, status_code, 1188 peer_capability, initiator, 1189 extra_ies, extra_ies_len, 0, 1190 NULL); 1191 if (ret < 0) { 1192 eth_zero_addr(sdata->u.mgd.tdls_peer); 1193 return ret; 1194 } 1195 1196 wiphy_delayed_work_queue(sdata->local->hw.wiphy, 1197 &sdata->u.mgd.tdls_peer_del_work, 1198 TDLS_PEER_SETUP_TIMEOUT); 1199 return 0; 1200 1201 out_unlock: 1202 return ret; 1203 } 1204 1205 static int 1206 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev, 1207 const u8 *peer, int link_id, 1208 u8 action_code, u8 dialog_token, 1209 u16 status_code, u32 peer_capability, 1210 bool initiator, const u8 *extra_ies, 1211 size_t extra_ies_len) 1212 { 1213 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1214 struct ieee80211_local *local = sdata->local; 1215 struct sta_info *sta; 1216 int ret; 1217 1218 /* 1219 * No packets can be transmitted to the peer via the AP during setup - 1220 * the STA is set as a TDLS peer, but is not authorized. 1221 * During teardown, we prevent direct transmissions by stopping the 1222 * queues and flushing all direct packets. 1223 */ 1224 ieee80211_stop_vif_queues(local, sdata, 1225 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1226 ieee80211_flush_queues(local, sdata, false); 1227 1228 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1229 link_id, action_code, 1230 dialog_token, status_code, 1231 peer_capability, initiator, 1232 extra_ies, extra_ies_len, 0, 1233 NULL); 1234 if (ret < 0) 1235 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n", 1236 ret); 1237 1238 /* 1239 * Remove the STA AUTH flag to force further traffic through the AP. If 1240 * the STA was unreachable, it was already removed. 1241 */ 1242 rcu_read_lock(); 1243 sta = sta_info_get(sdata, peer); 1244 if (sta) 1245 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1246 rcu_read_unlock(); 1247 1248 ieee80211_wake_vif_queues(local, sdata, 1249 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1250 1251 return 0; 1252 } 1253 1254 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev, 1255 const u8 *peer, int link_id, 1256 u8 action_code, u8 dialog_token, u16 status_code, 1257 u32 peer_capability, bool initiator, 1258 const u8 *extra_ies, size_t extra_ies_len) 1259 { 1260 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1261 int ret; 1262 1263 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1264 return -EOPNOTSUPP; 1265 1266 /* make sure we are in managed mode, and associated */ 1267 if (sdata->vif.type != NL80211_IFTYPE_STATION || 1268 !sdata->u.mgd.associated) 1269 return -EINVAL; 1270 1271 switch (action_code) { 1272 case WLAN_TDLS_SETUP_REQUEST: 1273 case WLAN_TDLS_SETUP_RESPONSE: 1274 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, 1275 link_id, action_code, 1276 dialog_token, status_code, 1277 peer_capability, initiator, 1278 extra_ies, extra_ies_len); 1279 break; 1280 case WLAN_TDLS_TEARDOWN: 1281 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, link_id, 1282 action_code, dialog_token, 1283 status_code, 1284 peer_capability, initiator, 1285 extra_ies, extra_ies_len); 1286 break; 1287 case WLAN_TDLS_DISCOVERY_REQUEST: 1288 /* 1289 * Protect the discovery so we can hear the TDLS discovery 1290 * response frame. It is transmitted directly and not buffered 1291 * by the AP. 1292 */ 1293 drv_mgd_protect_tdls_discover(sdata->local, sdata, link_id); 1294 fallthrough; 1295 case WLAN_TDLS_SETUP_CONFIRM: 1296 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 1297 /* no special handling */ 1298 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1299 link_id, action_code, 1300 dialog_token, 1301 status_code, 1302 peer_capability, 1303 initiator, extra_ies, 1304 extra_ies_len, 0, NULL); 1305 break; 1306 default: 1307 ret = -EOPNOTSUPP; 1308 break; 1309 } 1310 1311 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM link_id %d status %d\n", 1312 action_code, peer, link_id, ret); 1313 return ret; 1314 } 1315 1316 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata, 1317 struct sta_info *sta) 1318 { 1319 struct ieee80211_local *local = sdata->local; 1320 struct ieee80211_chanctx_conf *conf; 1321 struct ieee80211_chanctx *ctx; 1322 enum nl80211_chan_width width; 1323 struct ieee80211_supported_band *sband; 1324 1325 lockdep_assert_wiphy(local->hw.wiphy); 1326 1327 conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf, 1328 lockdep_is_held(&local->hw.wiphy->mtx)); 1329 if (conf) { 1330 width = conf->def.width; 1331 sband = local->hw.wiphy->bands[conf->def.chan->band]; 1332 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1333 ieee80211_recalc_chanctx_chantype(local, ctx); 1334 1335 /* if width changed and a peer is given, update its BW */ 1336 if (width != conf->def.width && sta && 1337 test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) { 1338 enum ieee80211_sta_rx_bandwidth bw; 1339 1340 bw = ieee80211_chan_width_to_rx_bw(conf->def.width); 1341 bw = min(bw, ieee80211_sta_current_bw(&sta->deflink, 1342 &conf->def, 1343 IEEE80211_STA_BW_RX_FROM_STA)); 1344 if (bw != sta->sta.deflink.bandwidth) { 1345 sta->sta.deflink.bandwidth = bw; 1346 rate_control_rate_update(local, sband, 1347 &sta->deflink, 1348 IEEE80211_RC_BW_CHANGED); 1349 /* 1350 * if a TDLS peer BW was updated, we need to 1351 * recalc the chandef width again, to get the 1352 * correct chanctx min_def 1353 */ 1354 ieee80211_recalc_chanctx_chantype(local, ctx); 1355 } 1356 } 1357 1358 } 1359 } 1360 1361 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata) 1362 { 1363 struct sta_info *sta; 1364 bool result = false; 1365 1366 rcu_read_lock(); 1367 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 1368 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 1369 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 1370 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) || 1371 !sta->sta.deflink.ht_cap.ht_supported) 1372 continue; 1373 result = true; 1374 break; 1375 } 1376 rcu_read_unlock(); 1377 1378 return result; 1379 } 1380 1381 static void 1382 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata, 1383 struct sta_info *sta) 1384 { 1385 bool tdls_ht; 1386 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | 1387 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | 1388 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; 1389 u16 opmode; 1390 1391 /* Nothing to do if the BSS connection uses (at least) HT */ 1392 if (sdata->deflink.u.mgd.conn.mode >= IEEE80211_CONN_MODE_HT) 1393 return; 1394 1395 tdls_ht = (sta && sta->sta.deflink.ht_cap.ht_supported) || 1396 iee80211_tdls_have_ht_peers(sdata); 1397 1398 opmode = sdata->vif.bss_conf.ht_operation_mode; 1399 1400 if (tdls_ht) 1401 opmode |= protection; 1402 else 1403 opmode &= ~protection; 1404 1405 if (opmode == sdata->vif.bss_conf.ht_operation_mode) 1406 return; 1407 1408 sdata->vif.bss_conf.ht_operation_mode = opmode; 1409 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1410 BSS_CHANGED_HT); 1411 } 1412 1413 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev, 1414 const u8 *peer, enum nl80211_tdls_operation oper) 1415 { 1416 struct sta_info *sta; 1417 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1418 struct ieee80211_local *local = sdata->local; 1419 int ret; 1420 1421 lockdep_assert_wiphy(local->hw.wiphy); 1422 1423 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1424 return -EOPNOTSUPP; 1425 1426 if (sdata->vif.type != NL80211_IFTYPE_STATION || !sdata->vif.cfg.assoc) 1427 return -EINVAL; 1428 1429 switch (oper) { 1430 case NL80211_TDLS_ENABLE_LINK: 1431 case NL80211_TDLS_DISABLE_LINK: 1432 break; 1433 case NL80211_TDLS_TEARDOWN: 1434 case NL80211_TDLS_SETUP: 1435 case NL80211_TDLS_DISCOVERY_REQ: 1436 /* We don't support in-driver setup/teardown/discovery */ 1437 return -EOPNOTSUPP; 1438 } 1439 1440 /* protect possible bss_conf changes and avoid concurrency in 1441 * ieee80211_bss_info_change_notify() 1442 */ 1443 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer); 1444 1445 switch (oper) { 1446 case NL80211_TDLS_ENABLE_LINK: 1447 if (sdata->vif.bss_conf.csa_active) { 1448 tdls_dbg(sdata, "TDLS: disallow link during CSA\n"); 1449 return -EBUSY; 1450 } 1451 1452 sta = sta_info_get(sdata, peer); 1453 if (!sta || !sta->sta.tdls) 1454 return -ENOLINK; 1455 1456 iee80211_tdls_recalc_chanctx(sdata, sta); 1457 iee80211_tdls_recalc_ht_protection(sdata, sta); 1458 1459 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1460 1461 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) || 1462 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)); 1463 break; 1464 case NL80211_TDLS_DISABLE_LINK: 1465 /* 1466 * The teardown message in ieee80211_tdls_mgmt_teardown() was 1467 * created while the queues were stopped, so it might still be 1468 * pending. Before flushing the queues we need to be sure the 1469 * message is handled by the tasklet handling pending messages, 1470 * otherwise we might start destroying the station before 1471 * sending the teardown packet. 1472 * Note that this only forces the tasklet to flush pendings - 1473 * not to stop the tasklet from rescheduling itself. 1474 */ 1475 tasklet_kill(&local->tx_pending_tasklet); 1476 /* flush a potentially queued teardown packet */ 1477 ieee80211_flush_queues(local, sdata, false); 1478 1479 ret = sta_info_destroy_addr(sdata, peer); 1480 1481 iee80211_tdls_recalc_ht_protection(sdata, NULL); 1482 1483 iee80211_tdls_recalc_chanctx(sdata, NULL); 1484 if (ret) 1485 return ret; 1486 break; 1487 default: 1488 return -EOPNOTSUPP; 1489 } 1490 1491 if (ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1492 wiphy_delayed_work_cancel(sdata->local->hw.wiphy, 1493 &sdata->u.mgd.tdls_peer_del_work); 1494 eth_zero_addr(sdata->u.mgd.tdls_peer); 1495 } 1496 1497 wiphy_work_queue(sdata->local->hw.wiphy, 1498 &sdata->deflink.u.mgd.request_smps_work); 1499 1500 return 0; 1501 } 1502 1503 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer, 1504 enum nl80211_tdls_operation oper, 1505 u16 reason_code, gfp_t gfp) 1506 { 1507 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1508 1509 if (vif->type != NL80211_IFTYPE_STATION || !vif->cfg.assoc) { 1510 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n", 1511 oper); 1512 return; 1513 } 1514 1515 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp); 1516 } 1517 EXPORT_SYMBOL(ieee80211_tdls_oper_request); 1518 1519 static void 1520 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout) 1521 { 1522 struct ieee80211_ch_switch_timing *ch_sw; 1523 1524 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING; 1525 *buf++ = sizeof(struct ieee80211_ch_switch_timing); 1526 1527 ch_sw = (void *)buf; 1528 ch_sw->switch_time = cpu_to_le16(switch_time); 1529 ch_sw->switch_timeout = cpu_to_le16(switch_timeout); 1530 } 1531 1532 /* find switch timing IE in SKB ready for Tx */ 1533 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb) 1534 { 1535 struct ieee80211_tdls_data *tf; 1536 const u8 *ie_start; 1537 1538 /* 1539 * Get the offset for the new location of the switch timing IE. 1540 * The SKB network header will now point to the "payload_type" 1541 * element of the TDLS data frame struct. 1542 */ 1543 tf = container_of(skb->data + skb_network_offset(skb), 1544 struct ieee80211_tdls_data, payload_type); 1545 ie_start = tf->u.chan_switch_req.variable; 1546 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start, 1547 skb->len - (ie_start - skb->data)); 1548 } 1549 1550 static struct sk_buff * 1551 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class, 1552 struct cfg80211_chan_def *chandef, 1553 u32 *ch_sw_tm_ie_offset) 1554 { 1555 struct ieee80211_sub_if_data *sdata = sta->sdata; 1556 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) + 1557 2 + sizeof(struct ieee80211_ch_switch_timing)]; 1558 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing); 1559 u8 *pos = extra_ies; 1560 struct sk_buff *skb; 1561 int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0; 1562 1563 /* 1564 * if chandef points to a wide channel add a Secondary-Channel 1565 * Offset information element 1566 */ 1567 if (chandef->width == NL80211_CHAN_WIDTH_40) { 1568 struct ieee80211_sec_chan_offs_ie *sec_chan_ie; 1569 bool ht40plus; 1570 1571 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; 1572 *pos++ = sizeof(*sec_chan_ie); 1573 sec_chan_ie = (void *)pos; 1574 1575 ht40plus = cfg80211_get_chandef_type(chandef) == 1576 NL80211_CHAN_HT40PLUS; 1577 sec_chan_ie->sec_chan_offs = ht40plus ? 1578 IEEE80211_HT_PARAM_CHA_SEC_ABOVE : 1579 IEEE80211_HT_PARAM_CHA_SEC_BELOW; 1580 pos += sizeof(*sec_chan_ie); 1581 1582 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie); 1583 } 1584 1585 /* just set the values to 0, this is a template */ 1586 iee80211_tdls_add_ch_switch_timing(pos, 0, 0); 1587 1588 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1589 link_id, 1590 WLAN_TDLS_CHANNEL_SWITCH_REQUEST, 1591 0, 0, !sta->sta.tdls_initiator, 1592 extra_ies, extra_ies_len, 1593 oper_class, chandef); 1594 if (!skb) 1595 return NULL; 1596 1597 skb = ieee80211_build_data_template(sdata, skb, 0); 1598 if (IS_ERR(skb)) { 1599 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n"); 1600 return NULL; 1601 } 1602 1603 if (ch_sw_tm_ie_offset) { 1604 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1605 1606 if (!tm_ie) { 1607 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n"); 1608 dev_kfree_skb_any(skb); 1609 return NULL; 1610 } 1611 1612 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1613 } 1614 1615 tdls_dbg(sdata, 1616 "TDLS channel switch request template for %pM ch %d width %d\n", 1617 sta->sta.addr, chandef->chan->center_freq, chandef->width); 1618 return skb; 1619 } 1620 1621 int 1622 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev, 1623 const u8 *addr, u8 oper_class, 1624 struct cfg80211_chan_def *chandef) 1625 { 1626 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1627 struct ieee80211_local *local = sdata->local; 1628 struct sta_info *sta; 1629 struct sk_buff *skb = NULL; 1630 u32 ch_sw_tm_ie; 1631 int ret; 1632 1633 lockdep_assert_wiphy(local->hw.wiphy); 1634 1635 if (chandef->chan->freq_offset) 1636 /* this may work, but is untested */ 1637 return -EOPNOTSUPP; 1638 1639 sta = sta_info_get(sdata, addr); 1640 if (!sta) { 1641 tdls_dbg(sdata, 1642 "Invalid TDLS peer %pM for channel switch request\n", 1643 addr); 1644 ret = -ENOENT; 1645 goto out; 1646 } 1647 1648 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) { 1649 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n", 1650 addr); 1651 ret = -EOPNOTSUPP; 1652 goto out; 1653 } 1654 1655 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef, 1656 &ch_sw_tm_ie); 1657 if (!skb) { 1658 ret = -ENOENT; 1659 goto out; 1660 } 1661 1662 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class, 1663 chandef, skb, ch_sw_tm_ie); 1664 if (!ret) 1665 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1666 1667 out: 1668 dev_kfree_skb_any(skb); 1669 return ret; 1670 } 1671 1672 void 1673 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy, 1674 struct net_device *dev, 1675 const u8 *addr) 1676 { 1677 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1678 struct ieee80211_local *local = sdata->local; 1679 struct sta_info *sta; 1680 1681 lockdep_assert_wiphy(local->hw.wiphy); 1682 1683 sta = sta_info_get(sdata, addr); 1684 if (!sta) { 1685 tdls_dbg(sdata, 1686 "Invalid TDLS peer %pM for channel switch cancel\n", 1687 addr); 1688 return; 1689 } 1690 1691 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) { 1692 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n", 1693 addr); 1694 return; 1695 } 1696 1697 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta); 1698 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1699 } 1700 1701 static struct sk_buff * 1702 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta, 1703 u32 *ch_sw_tm_ie_offset) 1704 { 1705 struct ieee80211_sub_if_data *sdata = sta->sdata; 1706 struct sk_buff *skb; 1707 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)]; 1708 int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0; 1709 1710 /* initial timing are always zero in the template */ 1711 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0); 1712 1713 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1714 link_id, 1715 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE, 1716 0, 0, !sta->sta.tdls_initiator, 1717 extra_ies, sizeof(extra_ies), 0, NULL); 1718 if (!skb) 1719 return NULL; 1720 1721 skb = ieee80211_build_data_template(sdata, skb, 0); 1722 if (IS_ERR(skb)) { 1723 tdls_dbg(sdata, 1724 "Failed building TDLS channel switch resp frame\n"); 1725 return NULL; 1726 } 1727 1728 if (ch_sw_tm_ie_offset) { 1729 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1730 1731 if (!tm_ie) { 1732 tdls_dbg(sdata, 1733 "No switch timing IE in TDLS switch resp\n"); 1734 dev_kfree_skb_any(skb); 1735 return NULL; 1736 } 1737 1738 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1739 } 1740 1741 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n", 1742 sta->sta.addr); 1743 return skb; 1744 } 1745 1746 static int 1747 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata, 1748 struct sk_buff *skb) 1749 { 1750 struct ieee80211_local *local = sdata->local; 1751 struct ieee802_11_elems *elems = NULL; 1752 struct sta_info *sta; 1753 struct ieee80211_tdls_data *tf = (void *)skb->data; 1754 bool local_initiator; 1755 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1756 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable); 1757 struct ieee80211_tdls_ch_sw_params params = {}; 1758 int ret; 1759 1760 lockdep_assert_wiphy(local->hw.wiphy); 1761 1762 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 1763 params.timestamp = rx_status->device_timestamp; 1764 1765 if (skb->len < baselen) { 1766 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n", 1767 skb->len); 1768 return -EINVAL; 1769 } 1770 1771 sta = sta_info_get(sdata, tf->sa); 1772 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1773 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1774 tf->sa); 1775 ret = -EINVAL; 1776 goto out; 1777 } 1778 1779 params.sta = &sta->sta; 1780 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code); 1781 if (params.status != 0) { 1782 ret = 0; 1783 goto call_drv; 1784 } 1785 1786 elems = ieee802_11_parse_elems(tf->u.chan_switch_resp.variable, 1787 skb->len - baselen, 1788 IEEE80211_FTYPE_MGMT | 1789 IEEE80211_STYPE_ACTION, 1790 NULL); 1791 if (!elems) { 1792 ret = -ENOMEM; 1793 goto out; 1794 } 1795 1796 if (elems->parse_error) { 1797 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n"); 1798 ret = -EINVAL; 1799 goto out; 1800 } 1801 1802 if (!elems->ch_sw_timing || !elems->lnk_id) { 1803 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n"); 1804 ret = -EINVAL; 1805 goto out; 1806 } 1807 1808 /* validate the initiator is set correctly */ 1809 local_initiator = 1810 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1811 if (local_initiator == sta->sta.tdls_initiator) { 1812 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1813 ret = -EINVAL; 1814 goto out; 1815 } 1816 1817 params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time); 1818 params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout); 1819 1820 params.tmpl_skb = 1821 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie); 1822 if (!params.tmpl_skb) { 1823 ret = -ENOENT; 1824 goto out; 1825 } 1826 1827 ret = 0; 1828 call_drv: 1829 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1830 1831 tdls_dbg(sdata, 1832 "TDLS channel switch response received from %pM status %d\n", 1833 tf->sa, params.status); 1834 1835 out: 1836 dev_kfree_skb_any(params.tmpl_skb); 1837 kfree(elems); 1838 return ret; 1839 } 1840 1841 static int 1842 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata, 1843 struct sk_buff *skb) 1844 { 1845 struct ieee80211_local *local = sdata->local; 1846 struct ieee802_11_elems *elems; 1847 struct cfg80211_chan_def chandef; 1848 struct ieee80211_channel *chan; 1849 enum nl80211_channel_type chan_type; 1850 int freq; 1851 u8 target_channel, oper_class; 1852 bool local_initiator; 1853 struct sta_info *sta; 1854 enum nl80211_band band; 1855 struct ieee80211_tdls_data *tf = (void *)skb->data; 1856 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1857 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable); 1858 struct ieee80211_tdls_ch_sw_params params = {}; 1859 int ret = 0; 1860 1861 lockdep_assert_wiphy(local->hw.wiphy); 1862 1863 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 1864 params.timestamp = rx_status->device_timestamp; 1865 1866 if (skb->len < baselen) { 1867 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n", 1868 skb->len); 1869 return -EINVAL; 1870 } 1871 1872 target_channel = tf->u.chan_switch_req.target_channel; 1873 oper_class = tf->u.chan_switch_req.oper_class; 1874 1875 /* 1876 * We can't easily infer the channel band. The operating class is 1877 * ambiguous - there are multiple tables (US/Europe/JP/Global). The 1878 * solution here is to treat channels with number >14 as 5GHz ones, 1879 * and specifically check for the (oper_class, channel) combinations 1880 * where this doesn't hold. These are thankfully unique according to 1881 * IEEE802.11-2012. 1882 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as 1883 * valid here. 1884 */ 1885 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 || 1886 oper_class == 4 || oper_class == 5 || oper_class == 6) && 1887 target_channel < 14) 1888 band = NL80211_BAND_5GHZ; 1889 else 1890 band = target_channel < 14 ? NL80211_BAND_2GHZ : 1891 NL80211_BAND_5GHZ; 1892 1893 freq = ieee80211_channel_to_frequency(target_channel, band); 1894 if (freq == 0) { 1895 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n", 1896 target_channel); 1897 return -EINVAL; 1898 } 1899 1900 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq); 1901 if (!chan) { 1902 tdls_dbg(sdata, 1903 "Unsupported channel for TDLS chan switch: %d\n", 1904 target_channel); 1905 return -EINVAL; 1906 } 1907 1908 elems = ieee802_11_parse_elems(tf->u.chan_switch_req.variable, 1909 skb->len - baselen, 1910 IEEE80211_FTYPE_MGMT | 1911 IEEE80211_STYPE_ACTION, 1912 NULL); 1913 if (!elems) 1914 return -ENOMEM; 1915 1916 if (elems->parse_error) { 1917 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n"); 1918 ret = -EINVAL; 1919 goto free; 1920 } 1921 1922 if (!elems->ch_sw_timing || !elems->lnk_id) { 1923 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n"); 1924 ret = -EINVAL; 1925 goto free; 1926 } 1927 1928 if (!elems->sec_chan_offs) { 1929 chan_type = NL80211_CHAN_HT20; 1930 } else { 1931 switch (elems->sec_chan_offs->sec_chan_offs) { 1932 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 1933 chan_type = NL80211_CHAN_HT40PLUS; 1934 break; 1935 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 1936 chan_type = NL80211_CHAN_HT40MINUS; 1937 break; 1938 default: 1939 chan_type = NL80211_CHAN_HT20; 1940 break; 1941 } 1942 } 1943 1944 cfg80211_chandef_create(&chandef, chan, chan_type); 1945 1946 /* we will be active on the TDLS link */ 1947 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef, 1948 sdata->wdev.iftype)) { 1949 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n"); 1950 ret = -EINVAL; 1951 goto free; 1952 } 1953 1954 sta = sta_info_get(sdata, tf->sa); 1955 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1956 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1957 tf->sa); 1958 ret = -EINVAL; 1959 goto out; 1960 } 1961 1962 params.sta = &sta->sta; 1963 1964 /* validate the initiator is set correctly */ 1965 local_initiator = 1966 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1967 if (local_initiator == sta->sta.tdls_initiator) { 1968 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1969 ret = -EINVAL; 1970 goto out; 1971 } 1972 1973 /* peer should have known better */ 1974 if (!sta->sta.deflink.ht_cap.ht_supported && elems->sec_chan_offs && 1975 elems->sec_chan_offs->sec_chan_offs) { 1976 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n"); 1977 ret = -EOPNOTSUPP; 1978 goto out; 1979 } 1980 1981 params.chandef = &chandef; 1982 params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time); 1983 params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout); 1984 1985 params.tmpl_skb = 1986 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, 1987 ¶ms.ch_sw_tm_ie); 1988 if (!params.tmpl_skb) { 1989 ret = -ENOENT; 1990 goto out; 1991 } 1992 1993 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1994 1995 tdls_dbg(sdata, 1996 "TDLS ch switch request received from %pM ch %d width %d\n", 1997 tf->sa, params.chandef->chan->center_freq, 1998 params.chandef->width); 1999 out: 2000 dev_kfree_skb_any(params.tmpl_skb); 2001 free: 2002 kfree(elems); 2003 return ret; 2004 } 2005 2006 void 2007 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata, 2008 struct sk_buff *skb) 2009 { 2010 struct ieee80211_tdls_data *tf = (void *)skb->data; 2011 struct wiphy *wiphy = sdata->local->hw.wiphy; 2012 2013 lockdep_assert_wiphy(wiphy); 2014 2015 /* make sure the driver supports it */ 2016 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH)) 2017 return; 2018 2019 /* we want to access the entire packet */ 2020 if (skb_linearize(skb)) 2021 return; 2022 /* 2023 * The packet/size was already validated by mac80211 Rx path, only look 2024 * at the action type. 2025 */ 2026 switch (tf->action_code) { 2027 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 2028 ieee80211_process_tdls_channel_switch_req(sdata, skb); 2029 break; 2030 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 2031 ieee80211_process_tdls_channel_switch_resp(sdata, skb); 2032 break; 2033 default: 2034 WARN_ON_ONCE(1); 2035 return; 2036 } 2037 } 2038 2039 void ieee80211_teardown_tdls_peers(struct ieee80211_link_data *link) 2040 { 2041 struct ieee80211_sub_if_data *sdata = link->sdata; 2042 struct sta_info *sta; 2043 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED; 2044 2045 rcu_read_lock(); 2046 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 2047 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 2048 !test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2049 continue; 2050 2051 if (sta->deflink.link_id != link->link_id) 2052 continue; 2053 2054 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr, 2055 NL80211_TDLS_TEARDOWN, reason, 2056 GFP_ATOMIC); 2057 } 2058 rcu_read_unlock(); 2059 } 2060 2061 void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata, 2062 const u8 *peer, u16 reason) 2063 { 2064 struct ieee80211_sta *sta; 2065 2066 rcu_read_lock(); 2067 sta = ieee80211_find_sta(&sdata->vif, peer); 2068 if (!sta || !sta->tdls) { 2069 rcu_read_unlock(); 2070 return; 2071 } 2072 rcu_read_unlock(); 2073 2074 tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n", 2075 peer, reason, 2076 ieee80211_get_reason_code_string(reason)); 2077 2078 ieee80211_tdls_oper_request(&sdata->vif, peer, 2079 NL80211_TDLS_TEARDOWN, 2080 WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE, 2081 GFP_ATOMIC); 2082 } 2083