1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * MLO link handling 4 * 5 * Copyright (C) 2022-2026 Intel Corporation 6 */ 7 #include <linux/slab.h> 8 #include <linux/kernel.h> 9 #include <net/mac80211.h> 10 #include "ieee80211_i.h" 11 #include "driver-ops.h" 12 #include "key.h" 13 #include "debugfs_netdev.h" 14 15 static void ieee80211_update_apvlan_links(struct ieee80211_sub_if_data *sdata) 16 { 17 unsigned long rem = ~sdata->vif.valid_links & 18 GENMASK(IEEE80211_MLD_MAX_NUM_LINKS - 1, 0); 19 struct ieee80211_local *local = sdata->local; 20 unsigned long add = sdata->vif.valid_links; 21 struct wiphy *wiphy = local->hw.wiphy; 22 struct ieee80211_sub_if_data *vlan; 23 struct ieee80211_link_data *link; 24 struct sta_info *sta; 25 26 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) { 27 int link_id; 28 29 if (vlan->wdev.use_4addr) { 30 sta = wiphy_dereference(wiphy, 31 vlan->u.vlan.sta); 32 if (sta) 33 add = add & sta->sta.valid_links; 34 } 35 36 if (add == vlan->vif.valid_links) 37 continue; 38 39 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) { 40 vlan->wdev.valid_links |= BIT(link_id); 41 ether_addr_copy(vlan->wdev.links[link_id].addr, 42 sdata->wdev.links[link_id].addr); 43 } 44 45 for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) { 46 vlan->wdev.valid_links &= ~BIT(link_id); 47 eth_zero_addr(vlan->wdev.links[link_id].addr); 48 } 49 50 ieee80211_vif_set_links(vlan, add, 0); 51 52 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) { 53 link = sdata_dereference(vlan->link[link_id], vlan); 54 ieee80211_link_vlan_copy_chanctx(link); 55 } 56 } 57 } 58 59 void ieee80211_apvlan_link_setup(struct ieee80211_sub_if_data *sdata) 60 { 61 struct ieee80211_sub_if_data *ap_bss = container_of(sdata->bss, 62 struct ieee80211_sub_if_data, u.ap); 63 u16 new_links = ap_bss->vif.valid_links; 64 unsigned long add; 65 int link_id; 66 67 if (!ap_bss->vif.valid_links) 68 return; 69 70 add = new_links; 71 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) { 72 sdata->wdev.valid_links |= BIT(link_id); 73 ether_addr_copy(sdata->wdev.links[link_id].addr, 74 ap_bss->wdev.links[link_id].addr); 75 } 76 77 ieee80211_vif_set_links(sdata, new_links, 0); 78 } 79 80 void ieee80211_apvlan_link_clear(struct ieee80211_sub_if_data *sdata) 81 { 82 if (!sdata->wdev.valid_links) 83 return; 84 85 sdata->wdev.valid_links = 0; 86 ieee80211_vif_clear_links(sdata); 87 } 88 89 void ieee80211_link_setup(struct ieee80211_link_data *link) 90 { 91 if (link->sdata->vif.type == NL80211_IFTYPE_STATION) 92 ieee80211_mgd_setup_link(link); 93 } 94 95 void ieee80211_link_init(struct ieee80211_sub_if_data *sdata, 96 int link_id, 97 struct ieee80211_link_data *link, 98 struct ieee80211_bss_conf *link_conf) 99 { 100 bool deflink = link_id < 0; 101 102 if (link_id < 0) 103 link_id = 0; 104 105 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 106 struct ieee80211_sub_if_data *ap_bss; 107 struct ieee80211_bss_conf *ap_bss_conf; 108 109 ap_bss = container_of(sdata->bss, 110 struct ieee80211_sub_if_data, u.ap); 111 112 if (deflink) 113 ap_bss_conf = &ap_bss->vif.bss_conf; 114 else 115 ap_bss_conf = sdata_dereference(ap_bss->vif.link_conf[link_id], 116 ap_bss); 117 118 memcpy(link_conf, ap_bss_conf, sizeof(*link_conf)); 119 } 120 121 link->sdata = sdata; 122 link->link_id = link_id; 123 link->conf = link_conf; 124 link_conf->link_id = link_id; 125 link_conf->vif = &sdata->vif; 126 link->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 127 link->user_power_level = sdata->local->user_power_level; 128 link_conf->txpower = INT_MIN; 129 130 wiphy_work_init(&link->csa.finalize_work, 131 ieee80211_csa_finalize_work); 132 wiphy_work_init(&link->color_change_finalize_work, 133 ieee80211_color_change_finalize_work); 134 wiphy_delayed_work_init(&link->color_collision_detect_work, 135 ieee80211_color_collision_detection_work); 136 wiphy_hrtimer_work_init(&link->dfs_cac_timer_work, 137 ieee80211_dfs_cac_timer_work); 138 139 if (!deflink) { 140 switch (sdata->vif.type) { 141 case NL80211_IFTYPE_AP: 142 case NL80211_IFTYPE_AP_VLAN: 143 ether_addr_copy(link_conf->addr, 144 sdata->wdev.links[link_id].addr); 145 link_conf->bssid = link_conf->addr; 146 WARN_ON(!(sdata->wdev.valid_links & BIT(link_id))); 147 break; 148 case NL80211_IFTYPE_STATION: 149 /* station sets the bssid in ieee80211_mgd_setup_link */ 150 break; 151 default: 152 WARN_ON(1); 153 } 154 155 ieee80211_link_debugfs_add(link); 156 } 157 158 rcu_assign_pointer(sdata->vif.link_conf[link_id], link_conf); 159 rcu_assign_pointer(sdata->link[link_id], link); 160 } 161 162 void ieee80211_link_stop(struct ieee80211_link_data *link) 163 { 164 if (link->sdata->vif.type == NL80211_IFTYPE_STATION) 165 ieee80211_mgd_stop_link(link); 166 167 wiphy_delayed_work_cancel(link->sdata->local->hw.wiphy, 168 &link->color_collision_detect_work); 169 wiphy_work_cancel(link->sdata->local->hw.wiphy, 170 &link->color_change_finalize_work); 171 wiphy_work_cancel(link->sdata->local->hw.wiphy, 172 &link->csa.finalize_work); 173 174 if (link->sdata->wdev.links[link->link_id].cac_started) { 175 wiphy_hrtimer_work_cancel(link->sdata->local->hw.wiphy, 176 &link->dfs_cac_timer_work); 177 cfg80211_cac_event(link->sdata->dev, 178 &link->conf->chanreq.oper, 179 NL80211_RADAR_CAC_ABORTED, 180 GFP_KERNEL, link->link_id); 181 } 182 183 ieee80211_link_release_channel(link); 184 } 185 186 struct link_container { 187 struct ieee80211_link_data data; 188 struct ieee80211_bss_conf conf; 189 }; 190 191 static void ieee80211_tear_down_links(struct ieee80211_sub_if_data *sdata, 192 struct link_container **links, u16 mask) 193 { 194 struct ieee80211_link_data *link; 195 LIST_HEAD(keys); 196 unsigned int link_id; 197 198 for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) { 199 if (!(mask & BIT(link_id))) 200 continue; 201 link = &links[link_id]->data; 202 if (link_id == 0 && !link) 203 link = &sdata->deflink; 204 if (WARN_ON(!link)) 205 continue; 206 ieee80211_remove_link_keys(link, &keys); 207 ieee80211_link_debugfs_remove(link); 208 ieee80211_link_stop(link); 209 } 210 211 synchronize_rcu(); 212 213 ieee80211_free_key_list(sdata->local, &keys); 214 } 215 216 static void ieee80211_free_links(struct ieee80211_sub_if_data *sdata, 217 struct link_container **links) 218 { 219 unsigned int link_id; 220 221 for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) 222 kfree(links[link_id]); 223 } 224 225 static int ieee80211_check_dup_link_addrs(struct ieee80211_sub_if_data *sdata) 226 { 227 unsigned int i, j; 228 229 for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++) { 230 struct ieee80211_link_data *link1; 231 232 link1 = sdata_dereference(sdata->link[i], sdata); 233 if (!link1) 234 continue; 235 for (j = i + 1; j < IEEE80211_MLD_MAX_NUM_LINKS; j++) { 236 struct ieee80211_link_data *link2; 237 238 link2 = sdata_dereference(sdata->link[j], sdata); 239 if (!link2) 240 continue; 241 242 if (ether_addr_equal(link1->conf->addr, 243 link2->conf->addr)) 244 return -EALREADY; 245 } 246 } 247 248 return 0; 249 } 250 251 static void ieee80211_set_vif_links_bitmaps(struct ieee80211_sub_if_data *sdata, 252 u16 valid_links, u16 dormant_links) 253 { 254 sdata->vif.valid_links = valid_links; 255 sdata->vif.dormant_links = dormant_links; 256 257 if (!valid_links || 258 WARN((~valid_links & dormant_links) || 259 !(valid_links & ~dormant_links), 260 "Invalid links: valid=0x%x, dormant=0x%x", 261 valid_links, dormant_links)) { 262 sdata->vif.active_links = 0; 263 sdata->vif.dormant_links = 0; 264 return; 265 } 266 267 switch (sdata->vif.type) { 268 case NL80211_IFTYPE_AP: 269 case NL80211_IFTYPE_AP_VLAN: 270 /* in an AP all links are always active */ 271 sdata->vif.active_links = valid_links; 272 273 /* AP links are not expected to be disabled */ 274 WARN_ON(dormant_links); 275 break; 276 case NL80211_IFTYPE_STATION: 277 if (sdata->vif.active_links) 278 break; 279 sdata->vif.active_links = valid_links & ~dormant_links; 280 WARN_ON(hweight16(sdata->vif.active_links) > 1); 281 break; 282 default: 283 WARN_ON(1); 284 } 285 } 286 287 static int ieee80211_vif_update_links(struct ieee80211_sub_if_data *sdata, 288 struct link_container **to_free, 289 u16 new_links, u16 dormant_links) 290 { 291 u16 old_links = sdata->vif.valid_links; 292 u16 old_active = sdata->vif.active_links; 293 unsigned long add = new_links & ~old_links; 294 unsigned long rem = old_links & ~new_links; 295 unsigned long sta_rem = rem; 296 unsigned int link_id; 297 int ret; 298 struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS] = {}, *link; 299 struct ieee80211_bss_conf *old[IEEE80211_MLD_MAX_NUM_LINKS]; 300 struct ieee80211_link_data *old_data[IEEE80211_MLD_MAX_NUM_LINKS]; 301 bool use_deflink = old_links == 0; /* set for error case */ 302 bool non_sta = sdata->vif.type != NL80211_IFTYPE_STATION; 303 struct sta_info *sta; 304 305 lockdep_assert_wiphy(sdata->local->hw.wiphy); 306 307 memset(to_free, 0, sizeof(links)); 308 309 if (old_links == new_links && dormant_links == sdata->vif.dormant_links) 310 return 0; 311 312 if (!old_links || !new_links) 313 WARN_ON(sta_info_flush(sdata, -1) > 0); 314 315 /* if there were no old links, need to clear the pointers to deflink */ 316 if (!old_links) 317 rem |= BIT(0); 318 319 /* allocate new link structures first */ 320 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) { 321 link = kzalloc_obj(*link); 322 if (!link) { 323 ret = -ENOMEM; 324 goto free; 325 } 326 links[link_id] = link; 327 } 328 329 /* keep track of the old pointers for the driver */ 330 BUILD_BUG_ON(sizeof(old) != sizeof(sdata->vif.link_conf)); 331 memcpy(old, sdata->vif.link_conf, sizeof(old)); 332 /* and for us in error cases */ 333 BUILD_BUG_ON(sizeof(old_data) != sizeof(sdata->link)); 334 memcpy(old_data, sdata->link, sizeof(old_data)); 335 336 /* grab old links to free later */ 337 for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) { 338 if (rcu_access_pointer(sdata->link[link_id]) != &sdata->deflink) { 339 /* 340 * we must have allocated the data through this path so 341 * we know we can free both at the same time 342 */ 343 to_free[link_id] = container_of(rcu_access_pointer(sdata->link[link_id]), 344 typeof(*links[link_id]), 345 data); 346 } 347 348 RCU_INIT_POINTER(sdata->link[link_id], NULL); 349 RCU_INIT_POINTER(sdata->vif.link_conf[link_id], NULL); 350 } 351 352 if (!old_links) 353 ieee80211_debugfs_recreate_netdev(sdata, true); 354 355 /* link them into data structures */ 356 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) { 357 WARN_ON(!use_deflink && 358 rcu_access_pointer(sdata->link[link_id]) == &sdata->deflink); 359 360 link = links[link_id]; 361 ieee80211_link_init(sdata, link_id, &link->data, &link->conf); 362 ieee80211_link_setup(&link->data); 363 ieee80211_set_wmm_default(&link->data, true, non_sta); 364 } 365 366 if (new_links == 0) 367 ieee80211_link_init(sdata, -1, &sdata->deflink, 368 &sdata->vif.bss_conf); 369 370 ret = ieee80211_check_dup_link_addrs(sdata); 371 if (!ret) { 372 /* for keys we will not be able to undo this */ 373 ieee80211_tear_down_links(sdata, to_free, rem); 374 375 ieee80211_set_vif_links_bitmaps(sdata, new_links, dormant_links); 376 377 /* tell the driver */ 378 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 379 ret = drv_change_vif_links(sdata->local, sdata, 380 old_links & old_active, 381 new_links & sdata->vif.active_links, 382 old); 383 if (!new_links) 384 ieee80211_debugfs_recreate_netdev(sdata, false); 385 386 if (sdata->vif.type == NL80211_IFTYPE_AP) 387 ieee80211_update_apvlan_links(sdata); 388 } 389 390 /* 391 * Ignore errors if we are only removing links as removal should 392 * always succeed 393 */ 394 if (!new_links) 395 ret = 0; 396 397 if (ret) { 398 /* restore config */ 399 memcpy(sdata->link, old_data, sizeof(old_data)); 400 memcpy(sdata->vif.link_conf, old, sizeof(old)); 401 ieee80211_set_vif_links_bitmaps(sdata, old_links, dormant_links); 402 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) { 403 ieee80211_link_debugfs_remove(&links[link_id]->data); 404 ieee80211_link_stop(&links[link_id]->data); 405 } 406 /* and free (only) the newly allocated links */ 407 memset(to_free, 0, sizeof(links)); 408 goto free; 409 } 410 411 /* try to remove links that are now invalid from (MLO) stations */ 412 list_for_each_entry(sta, &sdata->local->sta_list, list) { 413 unsigned long rem_links = sta->sta.valid_links & sta_rem; 414 415 if (sta->sdata != sdata) 416 continue; 417 418 /* 419 * skip stations that would have no links left, 420 * those will be removed completely later 421 */ 422 if (sta->sta.valid_links == rem_links) 423 continue; 424 425 for_each_set_bit(link_id, &rem_links, 426 IEEE80211_MLD_MAX_NUM_LINKS) 427 ieee80211_sta_remove_link(sta, link_id); 428 } 429 430 /* 431 * Remove stations using any removed links. Note that due 432 * to the above station link removal, this only removes 433 * stations that were skipped above because they'd have no 434 * links left after link removal. 435 */ 436 for_each_set_bit(link_id, &sta_rem, IEEE80211_MLD_MAX_NUM_LINKS) 437 sta_info_flush(sdata, link_id); 438 439 /* use deflink/bss_conf again if and only if there are no more links */ 440 use_deflink = new_links == 0; 441 442 goto deinit; 443 free: 444 /* if we failed during allocation, only free all */ 445 for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) { 446 kfree(links[link_id]); 447 links[link_id] = NULL; 448 } 449 deinit: 450 if (use_deflink) 451 ieee80211_link_init(sdata, -1, &sdata->deflink, 452 &sdata->vif.bss_conf); 453 return ret; 454 } 455 456 int ieee80211_vif_set_links(struct ieee80211_sub_if_data *sdata, 457 u16 new_links, u16 dormant_links) 458 { 459 struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS]; 460 int ret; 461 462 ret = ieee80211_vif_update_links(sdata, links, new_links, 463 dormant_links); 464 ieee80211_free_links(sdata, links); 465 466 return ret; 467 } 468 469 static int _ieee80211_set_active_links(struct ieee80211_sub_if_data *sdata, 470 u16 active_links) 471 { 472 struct ieee80211_bss_conf *link_confs[IEEE80211_MLD_MAX_NUM_LINKS]; 473 struct ieee80211_local *local = sdata->local; 474 u16 old_active = sdata->vif.active_links; 475 unsigned long rem = old_active & ~active_links; 476 unsigned long add = active_links & ~old_active; 477 struct sta_info *sta; 478 unsigned int link_id; 479 int ret, i; 480 481 if (!ieee80211_sdata_running(sdata)) 482 return -ENETDOWN; 483 484 if (sdata->vif.type != NL80211_IFTYPE_STATION) 485 return -EINVAL; 486 487 if (active_links & ~ieee80211_vif_usable_links(&sdata->vif)) 488 return -EINVAL; 489 490 /* nothing to do */ 491 if (old_active == active_links) 492 return 0; 493 494 for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++) 495 link_confs[i] = sdata_dereference(sdata->vif.link_conf[i], 496 sdata); 497 498 if (add) { 499 sdata->vif.active_links |= active_links; 500 ret = drv_change_vif_links(local, sdata, 501 old_active, 502 sdata->vif.active_links, 503 link_confs); 504 if (ret) { 505 sdata->vif.active_links = old_active; 506 return ret; 507 } 508 } 509 510 for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) { 511 struct ieee80211_link_data *link; 512 513 link = sdata_dereference(sdata->link[link_id], sdata); 514 515 ieee80211_teardown_tdls_peers(link); 516 517 __ieee80211_link_release_channel(link, true); 518 519 /* 520 * If CSA is (still) active while the link is deactivated, 521 * just schedule the channel switch work for the time we 522 * had previously calculated, and we'll take the process 523 * from there. 524 */ 525 if (link->conf->csa_active) 526 wiphy_hrtimer_work_queue(local->hw.wiphy, 527 &link->u.mgd.csa.switch_work, 528 link->u.mgd.csa.time - 529 ktime_get_boottime()); 530 } 531 532 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) { 533 struct ieee80211_link_data *link; 534 535 link = sdata_dereference(sdata->link[link_id], sdata); 536 537 /* 538 * This call really should not fail. Unfortunately, it appears 539 * that this may happen occasionally with some drivers. Should 540 * it happen, we are stuck in a bad place as going backwards is 541 * not really feasible. 542 * 543 * So lets just tell link_use_channel that it must not fail to 544 * assign the channel context (from mac80211's perspective) and 545 * assume the driver is going to trigger a recovery flow if it 546 * had a failure. 547 * That really is not great nor guaranteed to work. But at least 548 * the internal mac80211 state remains consistent and there is 549 * a chance that we can recover. 550 */ 551 ret = _ieee80211_link_use_channel(link, 552 &link->conf->chanreq, 553 IEEE80211_CHANCTX_SHARED, 554 true); 555 WARN_ON_ONCE(ret); 556 557 /* 558 * inform about the link info changed parameters after all 559 * stations are also added 560 */ 561 } 562 563 list_for_each_entry(sta, &local->sta_list, list) { 564 if (sdata != sta->sdata) 565 continue; 566 567 /* this is very temporary, but do it anyway */ 568 __ieee80211_sta_recalc_aggregates(sta, 569 old_active | active_links); 570 571 ret = drv_change_sta_links(local, sdata, &sta->sta, 572 old_active, 573 old_active | active_links); 574 WARN_ON_ONCE(ret); 575 } 576 577 ret = ieee80211_key_switch_links(sdata, rem, add); 578 WARN_ON_ONCE(ret); 579 580 list_for_each_entry(sta, &local->sta_list, list) { 581 if (sdata != sta->sdata) 582 continue; 583 584 __ieee80211_sta_recalc_aggregates(sta, active_links); 585 586 ret = drv_change_sta_links(local, sdata, &sta->sta, 587 old_active | active_links, 588 active_links); 589 WARN_ON_ONCE(ret); 590 591 /* 592 * Do it again, just in case - the driver might very 593 * well have called ieee80211_sta_recalc_aggregates() 594 * from there when filling in the new links, which 595 * would set it wrong since the vif's active links are 596 * not switched yet... 597 */ 598 __ieee80211_sta_recalc_aggregates(sta, active_links); 599 } 600 601 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) { 602 struct ieee80211_link_data *link; 603 604 link = sdata_dereference(sdata->link[link_id], sdata); 605 606 ieee80211_mgd_set_link_qos_params(link); 607 ieee80211_link_info_change_notify(sdata, link, 608 BSS_CHANGED_ERP_CTS_PROT | 609 BSS_CHANGED_ERP_PREAMBLE | 610 BSS_CHANGED_ERP_SLOT | 611 BSS_CHANGED_HT | 612 BSS_CHANGED_BASIC_RATES | 613 BSS_CHANGED_BSSID | 614 BSS_CHANGED_CQM | 615 BSS_CHANGED_QOS | 616 BSS_CHANGED_TXPOWER | 617 BSS_CHANGED_BANDWIDTH | 618 BSS_CHANGED_TWT | 619 BSS_CHANGED_HE_OBSS_PD | 620 BSS_CHANGED_HE_BSS_COLOR); 621 } 622 623 old_active = sdata->vif.active_links; 624 sdata->vif.active_links = active_links; 625 626 if (rem) { 627 ret = drv_change_vif_links(local, sdata, old_active, 628 active_links, link_confs); 629 WARN_ON_ONCE(ret); 630 } 631 632 return 0; 633 } 634 635 int ieee80211_set_active_links(struct ieee80211_vif *vif, u16 active_links) 636 { 637 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 638 struct ieee80211_local *local = sdata->local; 639 u16 old_active; 640 int ret; 641 642 lockdep_assert_wiphy(local->hw.wiphy); 643 644 if (WARN_ON(!active_links)) 645 return -EINVAL; 646 647 old_active = sdata->vif.active_links; 648 if (old_active == active_links) 649 return 0; 650 651 if (!drv_can_activate_links(local, sdata, active_links)) 652 return -EINVAL; 653 654 if (old_active & active_links) { 655 /* 656 * if there's at least one link that stays active across 657 * the change then switch to it (to those) first, and 658 * then enable the additional links 659 */ 660 ret = _ieee80211_set_active_links(sdata, 661 old_active & active_links); 662 if (!ret) 663 ret = _ieee80211_set_active_links(sdata, active_links); 664 } else { 665 /* otherwise switch directly */ 666 ret = _ieee80211_set_active_links(sdata, active_links); 667 } 668 669 return ret; 670 } 671 EXPORT_SYMBOL_GPL(ieee80211_set_active_links); 672 673 void ieee80211_set_active_links_async(struct ieee80211_vif *vif, 674 u16 active_links) 675 { 676 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 677 678 if (WARN_ON(!active_links)) 679 return; 680 681 if (!ieee80211_sdata_running(sdata)) 682 return; 683 684 if (sdata->vif.type != NL80211_IFTYPE_STATION) 685 return; 686 687 if (active_links & ~ieee80211_vif_usable_links(&sdata->vif)) 688 return; 689 690 /* nothing to do */ 691 if (sdata->vif.active_links == active_links) 692 return; 693 694 sdata->desired_active_links = active_links; 695 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->activate_links_work); 696 } 697 EXPORT_SYMBOL_GPL(ieee80211_set_active_links_async); 698