net/wireless/mlme.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * cfg80211 MLME SAP interface
   4  *
   5  * Copyright (c) 2009, Jouni Malinen <j@w1.fi>
   6  * Copyright (c) 2015           Intel Deutschland GmbH
   7  * Copyright (C) 2019-2020 Intel Corporation
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/etherdevice.h>
  13 #include <linux/netdevice.h>
  14 #include <linux/nl80211.h>
  15 #include <linux/slab.h>
  16 #include <linux/wireless.h>
  17 #include <net/cfg80211.h>
  18 #include <net/iw_handler.h>
  19 #include "core.h"
  20 #include "nl80211.h"
  21 #include "rdev-ops.h"
  22
  23
  24 void cfg80211_rx_assoc_resp(struct net_device *dev,
  25                             struct cfg80211_rx_assoc_resp *data)
  26 {
  27         struct wireless_dev *wdev = dev->ieee80211_ptr;
  28         struct wiphy *wiphy = wdev->wiphy;
  29         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  30         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)data->buf;
  31         struct cfg80211_connect_resp_params cr = {
  32                 .timeout_reason = NL80211_TIMEOUT_UNSPECIFIED,
  33                 .req_ie = data->req_ies,
  34                 .req_ie_len = data->req_ies_len,
  35                 .resp_ie = mgmt->u.assoc_resp.variable,
  36                 .resp_ie_len = data->len -
  37                                offsetof(struct ieee80211_mgmt,
  38                                         u.assoc_resp.variable),
  39                 .status = le16_to_cpu(mgmt->u.assoc_resp.status_code),
  40                 .ap_mld_addr = data->ap_mld_addr,
  41         };
  42         unsigned int link_id;
  43
  44         for (link_id = 0; link_id < ARRAY_SIZE(data->links); link_id++) {
  45                 cr.links[link_id].bss = data->links[link_id].bss;
  46                 if (!cr.links[link_id].bss)
  47                         continue;
  48                 cr.links[link_id].bssid = data->links[link_id].bss->bssid;
  49                 cr.links[link_id].addr = data->links[link_id].addr;
  50                 /* need to have local link addresses for MLO connections */
  51                 WARN_ON(cr.ap_mld_addr && !cr.links[link_id].addr);
  52
  53                 if (cr.links[link_id].bss->channel->band == NL80211_BAND_S1GHZ) {
  54                         WARN_ON(link_id);
  55                         cr.resp_ie = (u8 *)&mgmt->u.s1g_assoc_resp.variable;
  56                         cr.resp_ie_len = data->len -
  57                                          offsetof(struct ieee80211_mgmt,
  58                                                   u.s1g_assoc_resp.variable);
  59                 }
  60
  61                 if (cr.ap_mld_addr)
  62                         cr.valid_links |= BIT(link_id);
  63         }
  64
  65         trace_cfg80211_send_rx_assoc(dev, data);
  66
  67         /*
  68          * This is a bit of a hack, we don't notify userspace of
  69          * a (re-)association reply if we tried to send a reassoc
  70          * and got a reject -- we only try again with an assoc
  71          * frame instead of reassoc.
  72          */
  73         if (cfg80211_sme_rx_assoc_resp(wdev, cr.status)) {
  74                 for (link_id = 0; link_id < ARRAY_SIZE(data->links); link_id++) {
  75                         struct cfg80211_bss *bss = data->links[link_id].bss;
  76
  77                         if (!bss)
  78                                 continue;
  79
  80                         cfg80211_unhold_bss(bss_from_pub(bss));
  81                         cfg80211_put_bss(wiphy, bss);
  82                 }
  83                 return;
  84         }
  85
  86         nl80211_send_rx_assoc(rdev, dev, data);
  87         /* update current_bss etc., consumes the bss reference */
  88         __cfg80211_connect_result(dev, &cr, cr.status == WLAN_STATUS_SUCCESS);
  89 }
  90 EXPORT_SYMBOL(cfg80211_rx_assoc_resp);
  91
  92 static void cfg80211_process_auth(struct wireless_dev *wdev,
  93                                   const u8 *buf, size_t len)
  94 {
  95         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
  96
  97         nl80211_send_rx_auth(rdev, wdev->netdev, buf, len, GFP_KERNEL);
  98         cfg80211_sme_rx_auth(wdev, buf, len);
  99 }
 100
 101 static void cfg80211_process_deauth(struct wireless_dev *wdev,
 102                                     const u8 *buf, size_t len,
 103                                     bool reconnect)
 104 {
 105         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 106         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 107         const u8 *bssid = mgmt->bssid;
 108         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
 109         bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr);
 110
 111         nl80211_send_deauth(rdev, wdev->netdev, buf, len, reconnect, GFP_KERNEL);
 112
 113         if (!wdev->connected || !ether_addr_equal(wdev->u.client.connected_addr, bssid))
 114                 return;
 115
 116         __cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap);
 117         cfg80211_sme_deauth(wdev);
 118 }
 119
 120 static void cfg80211_process_disassoc(struct wireless_dev *wdev,
 121                                       const u8 *buf, size_t len,
 122                                       bool reconnect)
 123 {
 124         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 125         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 126         const u8 *bssid = mgmt->bssid;
 127         u16 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
 128         bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr);
 129
 130         nl80211_send_disassoc(rdev, wdev->netdev, buf, len, reconnect,
 131                               GFP_KERNEL);
 132
 133         if (WARN_ON(!wdev->connected ||
 134                     !ether_addr_equal(wdev->u.client.connected_addr, bssid)))
 135                 return;
 136
 137         __cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap);
 138         cfg80211_sme_disassoc(wdev);
 139 }
 140
 141 void cfg80211_rx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len)
 142 {
 143         struct wireless_dev *wdev = dev->ieee80211_ptr;
 144         struct ieee80211_mgmt *mgmt = (void *)buf;
 145
 146         ASSERT_WDEV_LOCK(wdev);
 147
 148         trace_cfg80211_rx_mlme_mgmt(dev, buf, len);
 149
 150         if (WARN_ON(len < 2))
 151                 return;
 152
 153         if (ieee80211_is_auth(mgmt->frame_control))
 154                 cfg80211_process_auth(wdev, buf, len);
 155         else if (ieee80211_is_deauth(mgmt->frame_control))
 156                 cfg80211_process_deauth(wdev, buf, len, false);
 157         else if (ieee80211_is_disassoc(mgmt->frame_control))
 158                 cfg80211_process_disassoc(wdev, buf, len, false);
 159 }
 160 EXPORT_SYMBOL(cfg80211_rx_mlme_mgmt);
 161
 162 void cfg80211_auth_timeout(struct net_device *dev, const u8 *addr)
 163 {
 164         struct wireless_dev *wdev = dev->ieee80211_ptr;
 165         struct wiphy *wiphy = wdev->wiphy;
 166         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 167
 168         trace_cfg80211_send_auth_timeout(dev, addr);
 169
 170         nl80211_send_auth_timeout(rdev, dev, addr, GFP_KERNEL);
 171         cfg80211_sme_auth_timeout(wdev);
 172 }
 173 EXPORT_SYMBOL(cfg80211_auth_timeout);
 174
 175 void cfg80211_assoc_failure(struct net_device *dev,
 176                             struct cfg80211_assoc_failure *data)
 177 {
 178         struct wireless_dev *wdev = dev->ieee80211_ptr;
 179         struct wiphy *wiphy = wdev->wiphy;
 180         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 181         const u8 *addr = data->ap_mld_addr ?: data->bss[0]->bssid;
 182         int i;
 183
 184         trace_cfg80211_send_assoc_failure(dev, data);
 185
 186         if (data->timeout) {
 187                 nl80211_send_assoc_timeout(rdev, dev, addr, GFP_KERNEL);
 188                 cfg80211_sme_assoc_timeout(wdev);
 189         } else {
 190                 cfg80211_sme_abandon_assoc(wdev);
 191         }
 192
 193         for (i = 0; i < ARRAY_SIZE(data->bss); i++) {
 194                 struct cfg80211_bss *bss = data->bss[i];
 195
 196                 if (!bss)
 197                         continue;
 198
 199                 cfg80211_unhold_bss(bss_from_pub(bss));
 200                 cfg80211_put_bss(wiphy, bss);
 201         }
 202 }
 203 EXPORT_SYMBOL(cfg80211_assoc_failure);
 204
 205 void cfg80211_tx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len,
 206                            bool reconnect)
 207 {
 208         struct wireless_dev *wdev = dev->ieee80211_ptr;
 209         struct ieee80211_mgmt *mgmt = (void *)buf;
 210
 211         ASSERT_WDEV_LOCK(wdev);
 212
 213         trace_cfg80211_tx_mlme_mgmt(dev, buf, len, reconnect);
 214
 215         if (WARN_ON(len < 2))
 216                 return;
 217
 218         if (ieee80211_is_deauth(mgmt->frame_control))
 219                 cfg80211_process_deauth(wdev, buf, len, reconnect);
 220         else
 221                 cfg80211_process_disassoc(wdev, buf, len, reconnect);
 222 }
 223 EXPORT_SYMBOL(cfg80211_tx_mlme_mgmt);
 224
 225 void cfg80211_michael_mic_failure(struct net_device *dev, const u8 *addr,
 226                                   enum nl80211_key_type key_type, int key_id,
 227                                   const u8 *tsc, gfp_t gfp)
 228 {
 229         struct wiphy *wiphy = dev->ieee80211_ptr->wiphy;
 230         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 231 #ifdef CONFIG_CFG80211_WEXT
 232         union iwreq_data wrqu;
 233         char *buf = kmalloc(128, gfp);
 234
 235         if (buf) {
 236                 sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
 237                         "keyid=%d %scast addr=%pM)", key_id,
 238                         key_type == NL80211_KEYTYPE_GROUP ? "broad" : "uni",
 239                         addr);
 240                 memset(&wrqu, 0, sizeof(wrqu));
 241                 wrqu.data.length = strlen(buf);
 242                 wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
 243                 kfree(buf);
 244         }
 245 #endif
 246
 247         trace_cfg80211_michael_mic_failure(dev, addr, key_type, key_id, tsc);
 248         nl80211_michael_mic_failure(rdev, dev, addr, key_type, key_id, tsc, gfp);
 249 }
 250 EXPORT_SYMBOL(cfg80211_michael_mic_failure);
 251
 252 /* some MLME handling for userspace SME */
 253 int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 254                        struct net_device *dev,
 255                        struct cfg80211_auth_request *req)
 256 {
 257         struct wireless_dev *wdev = dev->ieee80211_ptr;
 258
 259         ASSERT_WDEV_LOCK(wdev);
 260
 261         if (!req->bss)
 262                 return -ENOENT;
 263
 264         if (req->link_id >= 0 &&
 265             !(wdev->wiphy->flags & WIPHY_FLAG_SUPPORTS_MLO))
 266                 return -EINVAL;
 267
 268         if (req->auth_type == NL80211_AUTHTYPE_SHARED_KEY) {
 269                 if (!req->key || !req->key_len ||
 270                     req->key_idx < 0 || req->key_idx > 3)
 271                         return -EINVAL;
 272         }
 273
 274         if (wdev->connected &&
 275             ether_addr_equal(req->bss->bssid, wdev->u.client.connected_addr))
 276                 return -EALREADY;
 277
 278         return rdev_auth(rdev, dev, req);
 279 }
 280
 281 /*  Do a logical ht_capa &= ht_capa_mask.  */
 282 void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa,
 283                                const struct ieee80211_ht_cap *ht_capa_mask)
 284 {
 285         int i;
 286         u8 *p1, *p2;
 287         if (!ht_capa_mask) {
 288                 memset(ht_capa, 0, sizeof(*ht_capa));
 289                 return;
 290         }
 291
 292         p1 = (u8*)(ht_capa);
 293         p2 = (u8*)(ht_capa_mask);
 294         for (i = 0; i < sizeof(*ht_capa); i++)
 295                 p1[i] &= p2[i];
 296 }
 297
 298 /*  Do a logical vht_capa &= vht_capa_mask.  */
 299 void cfg80211_oper_and_vht_capa(struct ieee80211_vht_cap *vht_capa,
 300                                 const struct ieee80211_vht_cap *vht_capa_mask)
 301 {
 302         int i;
 303         u8 *p1, *p2;
 304         if (!vht_capa_mask) {
 305                 memset(vht_capa, 0, sizeof(*vht_capa));
 306                 return;
 307         }
 308
 309         p1 = (u8*)(vht_capa);
 310         p2 = (u8*)(vht_capa_mask);
 311         for (i = 0; i < sizeof(*vht_capa); i++)
 312                 p1[i] &= p2[i];
 313 }
 314
 315 /* Note: caller must cfg80211_put_bss() regardless of result */
 316 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 317                         struct net_device *dev,
 318                         struct cfg80211_assoc_request *req)
 319 {
 320         struct wireless_dev *wdev = dev->ieee80211_ptr;
 321         int err, i, j;
 322
 323         ASSERT_WDEV_LOCK(wdev);
 324
 325         for (i = 1; i < ARRAY_SIZE(req->links); i++) {
 326                 if (!req->links[i].bss)
 327                         continue;
 328                 for (j = 0; j < i; j++) {
 329                         if (req->links[i].bss == req->links[j].bss)
 330                                 return -EINVAL;
 331                 }
 332         }
 333
 334         if (wdev->connected &&
 335             (!req->prev_bssid ||
 336              !ether_addr_equal(wdev->u.client.connected_addr, req->prev_bssid)))
 337                 return -EALREADY;
 338
 339         cfg80211_oper_and_ht_capa(&req->ht_capa_mask,
 340                                   rdev->wiphy.ht_capa_mod_mask);
 341         cfg80211_oper_and_vht_capa(&req->vht_capa_mask,
 342                                    rdev->wiphy.vht_capa_mod_mask);
 343
 344         err = rdev_assoc(rdev, dev, req);
 345         if (!err) {
 346                 int link_id;
 347
 348                 if (req->bss) {
 349                         cfg80211_ref_bss(&rdev->wiphy, req->bss);
 350                         cfg80211_hold_bss(bss_from_pub(req->bss));
 351                 }
 352
 353                 for (link_id = 0; link_id < ARRAY_SIZE(req->links); link_id++) {
 354                         if (!req->links[link_id].bss)
 355                                 continue;
 356                         cfg80211_ref_bss(&rdev->wiphy, req->links[link_id].bss);
 357                         cfg80211_hold_bss(bss_from_pub(req->links[link_id].bss));
 358                 }
 359         }
 360         return err;
 361 }
 362
 363 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 364                          struct net_device *dev, const u8 *bssid,
 365                          const u8 *ie, int ie_len, u16 reason,
 366                          bool local_state_change)
 367 {
 368         struct wireless_dev *wdev = dev->ieee80211_ptr;
 369         struct cfg80211_deauth_request req = {
 370                 .bssid = bssid,
 371                 .reason_code = reason,
 372                 .ie = ie,
 373                 .ie_len = ie_len,
 374                 .local_state_change = local_state_change,
 375         };
 376
 377         ASSERT_WDEV_LOCK(wdev);
 378
 379         if (local_state_change &&
 380             (!wdev->connected ||
 381              !ether_addr_equal(wdev->u.client.connected_addr, bssid)))
 382                 return 0;
 383
 384         if (ether_addr_equal(wdev->disconnect_bssid, bssid) ||
 385             (wdev->connected &&
 386              ether_addr_equal(wdev->u.client.connected_addr, bssid)))
 387                 wdev->conn_owner_nlportid = 0;
 388
 389         return rdev_deauth(rdev, dev, &req);
 390 }
 391
 392 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
 393                            struct net_device *dev, const u8 *ap_addr,
 394                            const u8 *ie, int ie_len, u16 reason,
 395                            bool local_state_change)
 396 {
 397         struct wireless_dev *wdev = dev->ieee80211_ptr;
 398         struct cfg80211_disassoc_request req = {
 399                 .reason_code = reason,
 400                 .local_state_change = local_state_change,
 401                 .ie = ie,
 402                 .ie_len = ie_len,
 403                 .ap_addr = ap_addr,
 404         };
 405         int err;
 406
 407         ASSERT_WDEV_LOCK(wdev);
 408
 409         if (!wdev->connected)
 410                 return -ENOTCONN;
 411
 412         if (memcmp(wdev->u.client.connected_addr, ap_addr, ETH_ALEN))
 413                 return -ENOTCONN;
 414
 415         err = rdev_disassoc(rdev, dev, &req);
 416         if (err)
 417                 return err;
 418
 419         /* driver should have reported the disassoc */
 420         WARN_ON(wdev->connected);
 421         return 0;
 422 }
 423
 424 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
 425                         struct net_device *dev)
 426 {
 427         struct wireless_dev *wdev = dev->ieee80211_ptr;
 428         u8 bssid[ETH_ALEN];
 429
 430         ASSERT_WDEV_LOCK(wdev);
 431
 432         if (!rdev->ops->deauth)
 433                 return;
 434
 435         if (!wdev->connected)
 436                 return;
 437
 438         memcpy(bssid, wdev->u.client.connected_addr, ETH_ALEN);
 439         cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
 440                              WLAN_REASON_DEAUTH_LEAVING, false);
 441 }
 442
 443 struct cfg80211_mgmt_registration {
 444         struct list_head list;
 445         struct wireless_dev *wdev;
 446
 447         u32 nlportid;
 448
 449         int match_len;
 450
 451         __le16 frame_type;
 452
 453         bool multicast_rx;
 454
 455         u8 match[];
 456 };
 457
 458 static void cfg80211_mgmt_registrations_update(struct wireless_dev *wdev)
 459 {
 460         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 461         struct wireless_dev *tmp;
 462         struct cfg80211_mgmt_registration *reg;
 463         struct mgmt_frame_regs upd = {};
 464
 465         lockdep_assert_held(&rdev->wiphy.mtx);
 466
 467         spin_lock_bh(&rdev->mgmt_registrations_lock);
 468         if (!wdev->mgmt_registrations_need_update) {
 469                 spin_unlock_bh(&rdev->mgmt_registrations_lock);
 470                 return;
 471         }
 472
 473         rcu_read_lock();
 474         list_for_each_entry_rcu(tmp, &rdev->wiphy.wdev_list, list) {
 475                 list_for_each_entry(reg, &tmp->mgmt_registrations, list) {
 476                         u32 mask = BIT(le16_to_cpu(reg->frame_type) >> 4);
 477                         u32 mcast_mask = 0;
 478
 479                         if (reg->multicast_rx)
 480                                 mcast_mask = mask;
 481
 482                         upd.global_stypes |= mask;
 483                         upd.global_mcast_stypes |= mcast_mask;
 484
 485                         if (tmp == wdev) {
 486                                 upd.interface_stypes |= mask;
 487                                 upd.interface_mcast_stypes |= mcast_mask;
 488                         }
 489                 }
 490         }
 491         rcu_read_unlock();
 492
 493         wdev->mgmt_registrations_need_update = 0;
 494         spin_unlock_bh(&rdev->mgmt_registrations_lock);
 495
 496         rdev_update_mgmt_frame_registrations(rdev, wdev, &upd);
 497 }
 498
 499 void cfg80211_mgmt_registrations_update_wk(struct work_struct *wk)
 500 {
 501         struct cfg80211_registered_device *rdev;
 502         struct wireless_dev *wdev;
 503
 504         rdev = container_of(wk, struct cfg80211_registered_device,
 505                             mgmt_registrations_update_wk);
 506
 507         wiphy_lock(&rdev->wiphy);
 508         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
 509                 cfg80211_mgmt_registrations_update(wdev);
 510         wiphy_unlock(&rdev->wiphy);
 511 }
 512
 513 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_portid,
 514                                 u16 frame_type, const u8 *match_data,
 515                                 int match_len, bool multicast_rx,
 516                                 struct netlink_ext_ack *extack)
 517 {
 518         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 519         struct cfg80211_mgmt_registration *reg, *nreg;
 520         int err = 0;
 521         u16 mgmt_type;
 522         bool update_multicast = false;
 523
 524         if (!wdev->wiphy->mgmt_stypes)
 525                 return -EOPNOTSUPP;
 526
 527         if ((frame_type & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT) {
 528                 NL_SET_ERR_MSG(extack, "frame type not management");
 529                 return -EINVAL;
 530         }
 531
 532         if (frame_type & ~(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) {
 533                 NL_SET_ERR_MSG(extack, "Invalid frame type");
 534                 return -EINVAL;
 535         }
 536
 537         mgmt_type = (frame_type & IEEE80211_FCTL_STYPE) >> 4;
 538         if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].rx & BIT(mgmt_type))) {
 539                 NL_SET_ERR_MSG(extack,
 540                                "Registration to specific type not supported");
 541                 return -EINVAL;
 542         }
 543
 544         /*
 545          * To support Pre Association Security Negotiation (PASN), registration
 546          * for authentication frames should be supported. However, as some
 547          * versions of the user space daemons wrongly register to all types of
 548          * authentication frames (which might result in unexpected behavior)
 549          * allow such registration if the request is for a specific
 550          * authentication algorithm number.
 551          */
 552         if (wdev->iftype == NL80211_IFTYPE_STATION &&
 553             (frame_type & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_AUTH &&
 554             !(match_data && match_len >= 2)) {
 555                 NL_SET_ERR_MSG(extack,
 556                                "Authentication algorithm number required");
 557                 return -EINVAL;
 558         }
 559
 560         nreg = kzalloc(sizeof(*reg) + match_len, GFP_KERNEL);
 561         if (!nreg)
 562                 return -ENOMEM;
 563
 564         spin_lock_bh(&rdev->mgmt_registrations_lock);
 565
 566         list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
 567                 int mlen = min(match_len, reg->match_len);
 568
 569                 if (frame_type != le16_to_cpu(reg->frame_type))
 570                         continue;
 571
 572                 if (memcmp(reg->match, match_data, mlen) == 0) {
 573                         if (reg->multicast_rx != multicast_rx) {
 574                                 update_multicast = true;
 575                                 reg->multicast_rx = multicast_rx;
 576                                 break;
 577                         }
 578                         NL_SET_ERR_MSG(extack, "Match already configured");
 579                         err = -EALREADY;
 580                         break;
 581                 }
 582         }
 583
 584         if (err)
 585                 goto out;
 586
 587         if (update_multicast) {
 588                 kfree(nreg);
 589         } else {
 590                 memcpy(nreg->match, match_data, match_len);
 591                 nreg->match_len = match_len;
 592                 nreg->nlportid = snd_portid;
 593                 nreg->frame_type = cpu_to_le16(frame_type);
 594                 nreg->wdev = wdev;
 595                 nreg->multicast_rx = multicast_rx;
 596                 list_add(&nreg->list, &wdev->mgmt_registrations);
 597         }
 598         wdev->mgmt_registrations_need_update = 1;
 599         spin_unlock_bh(&rdev->mgmt_registrations_lock);
 600
 601         cfg80211_mgmt_registrations_update(wdev);
 602
 603         return 0;
 604
 605  out:
 606         kfree(nreg);
 607         spin_unlock_bh(&rdev->mgmt_registrations_lock);
 608
 609         return err;
 610 }
 611
 612 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlportid)
 613 {
 614         struct wiphy *wiphy = wdev->wiphy;
 615         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 616         struct cfg80211_mgmt_registration *reg, *tmp;
 617
 618         spin_lock_bh(&rdev->mgmt_registrations_lock);
 619
 620         list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
 621                 if (reg->nlportid != nlportid)
 622                         continue;
 623
 624                 list_del(&reg->list);
 625                 kfree(reg);
 626
 627                 wdev->mgmt_registrations_need_update = 1;
 628                 schedule_work(&rdev->mgmt_registrations_update_wk);
 629         }
 630
 631         spin_unlock_bh(&rdev->mgmt_registrations_lock);
 632
 633         if (nlportid && rdev->crit_proto_nlportid == nlportid) {
 634                 rdev->crit_proto_nlportid = 0;
 635                 rdev_crit_proto_stop(rdev, wdev);
 636         }
 637
 638         if (nlportid == wdev->ap_unexpected_nlportid)
 639                 wdev->ap_unexpected_nlportid = 0;
 640 }
 641
 642 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev)
 643 {
 644         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 645         struct cfg80211_mgmt_registration *reg, *tmp;
 646
 647         spin_lock_bh(&rdev->mgmt_registrations_lock);
 648         list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
 649                 list_del(&reg->list);
 650                 kfree(reg);
 651         }
 652         wdev->mgmt_registrations_need_update = 1;
 653         spin_unlock_bh(&rdev->mgmt_registrations_lock);
 654
 655         cfg80211_mgmt_registrations_update(wdev);
 656 }
 657
 658 static bool cfg80211_allowed_address(struct wireless_dev *wdev, const u8 *addr)
 659 {
 660         int i;
 661
 662         for_each_valid_link(wdev, i) {
 663                 if (ether_addr_equal(addr, wdev->links[i].addr))
 664                         return true;
 665         }
 666
 667         return ether_addr_equal(addr, wdev_address(wdev));
 668 }
 669
 670 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
 671                           struct wireless_dev *wdev,
 672                           struct cfg80211_mgmt_tx_params *params, u64 *cookie)
 673 {
 674         const struct ieee80211_mgmt *mgmt;
 675         u16 stype;
 676
 677         if (!wdev->wiphy->mgmt_stypes)
 678                 return -EOPNOTSUPP;
 679
 680         if (!rdev->ops->mgmt_tx)
 681                 return -EOPNOTSUPP;
 682
 683         if (params->len < 24 + 1)
 684                 return -EINVAL;
 685
 686         mgmt = (const struct ieee80211_mgmt *)params->buf;
 687
 688         if (!ieee80211_is_mgmt(mgmt->frame_control))
 689                 return -EINVAL;
 690
 691         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 692         if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].tx & BIT(stype >> 4)))
 693                 return -EINVAL;
 694
 695         if (ieee80211_is_action(mgmt->frame_control) &&
 696             mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) {
 697                 int err = 0;
 698
 699                 wdev_lock(wdev);
 700
 701                 switch (wdev->iftype) {
 702                 case NL80211_IFTYPE_ADHOC:
 703                         /*
 704                          * check for IBSS DA must be done by driver as
 705                          * cfg80211 doesn't track the stations
 706                          */
 707                         if (!wdev->u.ibss.current_bss ||
 708                             !ether_addr_equal(wdev->u.ibss.current_bss->pub.bssid,
 709                                               mgmt->bssid)) {
 710                                 err = -ENOTCONN;
 711                                 break;
 712                         }
 713                         break;
 714                 case NL80211_IFTYPE_STATION:
 715                 case NL80211_IFTYPE_P2P_CLIENT:
 716                         if (!wdev->connected) {
 717                                 err = -ENOTCONN;
 718                                 break;
 719                         }
 720
 721                         /* FIXME: MLD may address this differently */
 722
 723                         if (!ether_addr_equal(wdev->u.client.connected_addr,
 724                                               mgmt->bssid)) {
 725                                 err = -ENOTCONN;
 726                                 break;
 727                         }
 728
 729                         /* for station, check that DA is the AP */
 730                         if (!ether_addr_equal(wdev->u.client.connected_addr,
 731                                               mgmt->da)) {
 732                                 err = -ENOTCONN;
 733                                 break;
 734                         }
 735                         break;
 736                 case NL80211_IFTYPE_AP:
 737                 case NL80211_IFTYPE_P2P_GO:
 738                 case NL80211_IFTYPE_AP_VLAN:
 739                         if (!ether_addr_equal(mgmt->bssid, wdev_address(wdev)))
 740                                 err = -EINVAL;
 741                         break;
 742                 case NL80211_IFTYPE_MESH_POINT:
 743                         if (!ether_addr_equal(mgmt->sa, mgmt->bssid)) {
 744                                 err = -EINVAL;
 745                                 break;
 746                         }
 747                         /*
 748                          * check for mesh DA must be done by driver as
 749                          * cfg80211 doesn't track the stations
 750                          */
 751                         break;
 752                 case NL80211_IFTYPE_P2P_DEVICE:
 753                         /*
 754                          * fall through, P2P device only supports
 755                          * public action frames
 756                          */
 757                 case NL80211_IFTYPE_NAN:
 758                 default:
 759                         err = -EOPNOTSUPP;
 760                         break;
 761                 }
 762                 wdev_unlock(wdev);
 763
 764                 if (err)
 765                         return err;
 766         }
 767
 768         if (!cfg80211_allowed_address(wdev, mgmt->sa)) {
 769                 /* Allow random TA to be used with Public Action frames if the
 770                  * driver has indicated support for this. Otherwise, only allow
 771                  * the local address to be used.
 772                  */
 773                 if (!ieee80211_is_action(mgmt->frame_control) ||
 774                     mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
 775                         return -EINVAL;
 776                 if (!wdev->connected &&
 777                     !wiphy_ext_feature_isset(
 778                             &rdev->wiphy,
 779                             NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA))
 780                         return -EINVAL;
 781                 if (wdev->connected &&
 782                     !wiphy_ext_feature_isset(
 783                             &rdev->wiphy,
 784                             NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA_CONNECTED))
 785                         return -EINVAL;
 786         }
 787
 788         /* Transmit the management frame as requested by user space */
 789         return rdev_mgmt_tx(rdev, wdev, params, cookie);
 790 }
 791
 792 bool cfg80211_rx_mgmt_khz(struct wireless_dev *wdev, int freq, int sig_dbm,
 793                           const u8 *buf, size_t len, u32 flags)
 794 {
 795         struct wiphy *wiphy = wdev->wiphy;
 796         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 797         struct cfg80211_mgmt_registration *reg;
 798         const struct ieee80211_txrx_stypes *stypes =
 799                 &wiphy->mgmt_stypes[wdev->iftype];
 800         struct ieee80211_mgmt *mgmt = (void *)buf;
 801         const u8 *data;
 802         int data_len;
 803         bool result = false;
 804         __le16 ftype = mgmt->frame_control &
 805                 cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE);
 806         u16 stype;
 807
 808         trace_cfg80211_rx_mgmt(wdev, freq, sig_dbm);
 809         stype = (le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE) >> 4;
 810
 811         if (!(stypes->rx & BIT(stype))) {
 812                 trace_cfg80211_return_bool(false);
 813                 return false;
 814         }
 815
 816         data = buf + ieee80211_hdrlen(mgmt->frame_control);
 817         data_len = len - ieee80211_hdrlen(mgmt->frame_control);
 818
 819         spin_lock_bh(&rdev->mgmt_registrations_lock);
 820
 821         list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
 822                 if (reg->frame_type != ftype)
 823                         continue;
 824
 825                 if (reg->match_len > data_len)
 826                         continue;
 827
 828                 if (memcmp(reg->match, data, reg->match_len))
 829                         continue;
 830
 831                 /* found match! */
 832
 833                 /* Indicate the received Action frame to user space */
 834                 if (nl80211_send_mgmt(rdev, wdev, reg->nlportid,
 835                                       freq, sig_dbm,
 836                                       buf, len, flags, GFP_ATOMIC))
 837                         continue;
 838
 839                 result = true;
 840                 break;
 841         }
 842
 843         spin_unlock_bh(&rdev->mgmt_registrations_lock);
 844
 845         trace_cfg80211_return_bool(result);
 846         return result;
 847 }
 848 EXPORT_SYMBOL(cfg80211_rx_mgmt_khz);
 849
 850 void cfg80211_sched_dfs_chan_update(struct cfg80211_registered_device *rdev)
 851 {
 852         cancel_delayed_work(&rdev->dfs_update_channels_wk);
 853         queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk, 0);
 854 }
 855
 856 void cfg80211_dfs_channels_update_work(struct work_struct *work)
 857 {
 858         struct delayed_work *delayed_work = to_delayed_work(work);
 859         struct cfg80211_registered_device *rdev;
 860         struct cfg80211_chan_def chandef;
 861         struct ieee80211_supported_band *sband;
 862         struct ieee80211_channel *c;
 863         struct wiphy *wiphy;
 864         bool check_again = false;
 865         unsigned long timeout, next_time = 0;
 866         unsigned long time_dfs_update;
 867         enum nl80211_radar_event radar_event;
 868         int bandid, i;
 869
 870         rdev = container_of(delayed_work, struct cfg80211_registered_device,
 871                             dfs_update_channels_wk);
 872         wiphy = &rdev->wiphy;
 873
 874         rtnl_lock();
 875         for (bandid = 0; bandid < NUM_NL80211_BANDS; bandid++) {
 876                 sband = wiphy->bands[bandid];
 877                 if (!sband)
 878                         continue;
 879
 880                 for (i = 0; i < sband->n_channels; i++) {
 881                         c = &sband->channels[i];
 882
 883                         if (!(c->flags & IEEE80211_CHAN_RADAR))
 884                                 continue;
 885
 886                         if (c->dfs_state != NL80211_DFS_UNAVAILABLE &&
 887                             c->dfs_state != NL80211_DFS_AVAILABLE)
 888                                 continue;
 889
 890                         if (c->dfs_state == NL80211_DFS_UNAVAILABLE) {
 891                                 time_dfs_update = IEEE80211_DFS_MIN_NOP_TIME_MS;
 892                                 radar_event = NL80211_RADAR_NOP_FINISHED;
 893                         } else {
 894                                 if (regulatory_pre_cac_allowed(wiphy) ||
 895                                     cfg80211_any_wiphy_oper_chan(wiphy, c))
 896                                         continue;
 897
 898                                 time_dfs_update = REG_PRE_CAC_EXPIRY_GRACE_MS;
 899                                 radar_event = NL80211_RADAR_PRE_CAC_EXPIRED;
 900                         }
 901
 902                         timeout = c->dfs_state_entered +
 903                                   msecs_to_jiffies(time_dfs_update);
 904
 905                         if (time_after_eq(jiffies, timeout)) {
 906                                 c->dfs_state = NL80211_DFS_USABLE;
 907                                 c->dfs_state_entered = jiffies;
 908
 909                                 cfg80211_chandef_create(&chandef, c,
 910                                                         NL80211_CHAN_NO_HT);
 911
 912                                 nl80211_radar_notify(rdev, &chandef,
 913                                                      radar_event, NULL,
 914                                                      GFP_ATOMIC);
 915
 916                                 regulatory_propagate_dfs_state(wiphy, &chandef,
 917                                                                c->dfs_state,
 918                                                                radar_event);
 919                                 continue;
 920                         }
 921
 922                         if (!check_again)
 923                                 next_time = timeout - jiffies;
 924                         else
 925                                 next_time = min(next_time, timeout - jiffies);
 926                         check_again = true;
 927                 }
 928         }
 929         rtnl_unlock();
 930
 931         /* reschedule if there are other channels waiting to be cleared again */
 932         if (check_again)
 933                 queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
 934                                    next_time);
 935 }
 936
 937
 938 void __cfg80211_radar_event(struct wiphy *wiphy,
 939                             struct cfg80211_chan_def *chandef,
 940                             bool offchan, gfp_t gfp)
 941 {
 942         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 943
 944         trace_cfg80211_radar_event(wiphy, chandef, offchan);
 945
 946         /* only set the chandef supplied channel to unavailable, in
 947          * case the radar is detected on only one of multiple channels
 948          * spanned by the chandef.
 949          */
 950         cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_UNAVAILABLE);
 951
 952         if (offchan)
 953                 queue_work(cfg80211_wq, &rdev->background_cac_abort_wk);
 954
 955         cfg80211_sched_dfs_chan_update(rdev);
 956
 957         nl80211_radar_notify(rdev, chandef, NL80211_RADAR_DETECTED, NULL, gfp);
 958
 959         memcpy(&rdev->radar_chandef, chandef, sizeof(struct cfg80211_chan_def));
 960         queue_work(cfg80211_wq, &rdev->propagate_radar_detect_wk);
 961 }
 962 EXPORT_SYMBOL(__cfg80211_radar_event);
 963
 964 void cfg80211_cac_event(struct net_device *netdev,
 965                         const struct cfg80211_chan_def *chandef,
 966                         enum nl80211_radar_event event, gfp_t gfp)
 967 {
 968         struct wireless_dev *wdev = netdev->ieee80211_ptr;
 969         struct wiphy *wiphy = wdev->wiphy;
 970         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 971         unsigned long timeout;
 972
 973         /* not yet supported */
 974         if (wdev->valid_links)
 975                 return;
 976
 977         trace_cfg80211_cac_event(netdev, event);
 978
 979         if (WARN_ON(!wdev->cac_started && event != NL80211_RADAR_CAC_STARTED))
 980                 return;
 981
 982         switch (event) {
 983         case NL80211_RADAR_CAC_FINISHED:
 984                 timeout = wdev->cac_start_time +
 985                           msecs_to_jiffies(wdev->cac_time_ms);
 986                 WARN_ON(!time_after_eq(jiffies, timeout));
 987                 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
 988                 memcpy(&rdev->cac_done_chandef, chandef,
 989                        sizeof(struct cfg80211_chan_def));
 990                 queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk);
 991                 cfg80211_sched_dfs_chan_update(rdev);
 992                 fallthrough;
 993         case NL80211_RADAR_CAC_ABORTED:
 994                 wdev->cac_started = false;
 995                 break;
 996         case NL80211_RADAR_CAC_STARTED:
 997                 wdev->cac_started = true;
 998                 break;
 999         default:
1000                 WARN_ON(1);
1001                 return;
1002         }
1003
1004         nl80211_radar_notify(rdev, chandef, event, netdev, gfp);
1005 }
1006 EXPORT_SYMBOL(cfg80211_cac_event);
1007
1008 static void
1009 __cfg80211_background_cac_event(struct cfg80211_registered_device *rdev,
1010                                 struct wireless_dev *wdev,
1011                                 const struct cfg80211_chan_def *chandef,
1012                                 enum nl80211_radar_event event)
1013 {
1014         struct wiphy *wiphy = &rdev->wiphy;
1015         struct net_device *netdev;
1016
1017         lockdep_assert_wiphy(&rdev->wiphy);
1018
1019         if (!cfg80211_chandef_valid(chandef))
1020                 return;
1021
1022         if (!rdev->background_radar_wdev)
1023                 return;
1024
1025         switch (event) {
1026         case NL80211_RADAR_CAC_FINISHED:
1027                 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
1028                 memcpy(&rdev->cac_done_chandef, chandef, sizeof(*chandef));
1029                 queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk);
1030                 cfg80211_sched_dfs_chan_update(rdev);
1031                 wdev = rdev->background_radar_wdev;
1032                 break;
1033         case NL80211_RADAR_CAC_ABORTED:
1034                 if (!cancel_delayed_work(&rdev->background_cac_done_wk))
1035                         return;
1036                 wdev = rdev->background_radar_wdev;
1037                 break;
1038         case NL80211_RADAR_CAC_STARTED:
1039                 break;
1040         default:
1041                 return;
1042         }
1043
1044         netdev = wdev ? wdev->netdev : NULL;
1045         nl80211_radar_notify(rdev, chandef, event, netdev, GFP_KERNEL);
1046 }
1047
1048 static void
1049 cfg80211_background_cac_event(struct cfg80211_registered_device *rdev,
1050                               const struct cfg80211_chan_def *chandef,
1051                               enum nl80211_radar_event event)
1052 {
1053         wiphy_lock(&rdev->wiphy);
1054         __cfg80211_background_cac_event(rdev, rdev->background_radar_wdev,
1055                                         chandef, event);
1056         wiphy_unlock(&rdev->wiphy);
1057 }
1058
1059 void cfg80211_background_cac_done_wk(struct work_struct *work)
1060 {
1061         struct delayed_work *delayed_work = to_delayed_work(work);
1062         struct cfg80211_registered_device *rdev;
1063
1064         rdev = container_of(delayed_work, struct cfg80211_registered_device,
1065                             background_cac_done_wk);
1066         cfg80211_background_cac_event(rdev, &rdev->background_radar_chandef,
1067                                       NL80211_RADAR_CAC_FINISHED);
1068 }
1069
1070 void cfg80211_background_cac_abort_wk(struct work_struct *work)
1071 {
1072         struct cfg80211_registered_device *rdev;
1073
1074         rdev = container_of(work, struct cfg80211_registered_device,
1075                             background_cac_abort_wk);
1076         cfg80211_background_cac_event(rdev, &rdev->background_radar_chandef,
1077                                       NL80211_RADAR_CAC_ABORTED);
1078 }
1079
1080 void cfg80211_background_cac_abort(struct wiphy *wiphy)
1081 {
1082         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1083
1084         queue_work(cfg80211_wq, &rdev->background_cac_abort_wk);
1085 }
1086 EXPORT_SYMBOL(cfg80211_background_cac_abort);
1087
1088 int
1089 cfg80211_start_background_radar_detection(struct cfg80211_registered_device *rdev,
1090                                           struct wireless_dev *wdev,
1091                                           struct cfg80211_chan_def *chandef)
1092 {
1093         unsigned int cac_time_ms;
1094         int err;
1095
1096         lockdep_assert_wiphy(&rdev->wiphy);
1097
1098         if (!wiphy_ext_feature_isset(&rdev->wiphy,
1099                                      NL80211_EXT_FEATURE_RADAR_BACKGROUND))
1100                 return -EOPNOTSUPP;
1101
1102         /* Offchannel chain already locked by another wdev */
1103         if (rdev->background_radar_wdev && rdev->background_radar_wdev != wdev)
1104                 return -EBUSY;
1105
1106         /* CAC already in progress on the offchannel chain */
1107         if (rdev->background_radar_wdev == wdev &&
1108             delayed_work_pending(&rdev->background_cac_done_wk))
1109                 return -EBUSY;
1110
1111         err = rdev_set_radar_background(rdev, chandef);
1112         if (err)
1113                 return err;
1114
1115         cac_time_ms = cfg80211_chandef_dfs_cac_time(&rdev->wiphy, chandef);
1116         if (!cac_time_ms)
1117                 cac_time_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
1118
1119         rdev->background_radar_chandef = *chandef;
1120         rdev->background_radar_wdev = wdev; /* Get offchain ownership */
1121
1122         __cfg80211_background_cac_event(rdev, wdev, chandef,
1123                                         NL80211_RADAR_CAC_STARTED);
1124         queue_delayed_work(cfg80211_wq, &rdev->background_cac_done_wk,
1125                            msecs_to_jiffies(cac_time_ms));
1126
1127         return 0;
1128 }
1129
1130 void cfg80211_stop_background_radar_detection(struct wireless_dev *wdev)
1131 {
1132         struct wiphy *wiphy = wdev->wiphy;
1133         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1134
1135         lockdep_assert_wiphy(wiphy);
1136
1137         if (wdev != rdev->background_radar_wdev)
1138                 return;
1139
1140         rdev_set_radar_background(rdev, NULL);
1141         rdev->background_radar_wdev = NULL; /* Release offchain ownership */
1142
1143         __cfg80211_background_cac_event(rdev, wdev,
1144                                         &rdev->background_radar_chandef,
1145                                         NL80211_RADAR_CAC_ABORTED);
1146 }