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, 2022 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].status = data->links[link_id].status;
  46                 WARN_ON_ONCE(cr.links[link_id].status != WLAN_STATUS_SUCCESS &&
  47                              (!cr.ap_mld_addr || !cr.links[link_id].bss));
  48
  49                 cr.links[link_id].bss = data->links[link_id].bss;
  50                 if (!cr.links[link_id].bss)
  51                         continue;
  52                 cr.links[link_id].bssid = data->links[link_id].bss->bssid;
  53                 cr.links[link_id].addr = data->links[link_id].addr;
  54                 /* need to have local link addresses for MLO connections */
  55                 WARN_ON(cr.ap_mld_addr && !cr.links[link_id].addr);
  56
  57                 BUG_ON(!cr.links[link_id].bss->channel);
  58
  59                 if (cr.links[link_id].bss->channel->band == NL80211_BAND_S1GHZ) {
  60                         WARN_ON(link_id);
  61                         cr.resp_ie = (u8 *)&mgmt->u.s1g_assoc_resp.variable;
  62                         cr.resp_ie_len = data->len -
  63                                          offsetof(struct ieee80211_mgmt,
  64                                                   u.s1g_assoc_resp.variable);
  65                 }
  66
  67                 if (cr.ap_mld_addr)
  68                         cr.valid_links |= BIT(link_id);
  69         }
  70
  71         trace_cfg80211_send_rx_assoc(dev, data);
  72
  73         /*
  74          * This is a bit of a hack, we don't notify userspace of
  75          * a (re-)association reply if we tried to send a reassoc
  76          * and got a reject -- we only try again with an assoc
  77          * frame instead of reassoc.
  78          */
  79         if (cfg80211_sme_rx_assoc_resp(wdev, cr.status)) {
  80                 for (link_id = 0; link_id < ARRAY_SIZE(data->links); link_id++) {
  81                         struct cfg80211_bss *bss = data->links[link_id].bss;
  82
  83                         if (!bss)
  84                                 continue;
  85
  86                         cfg80211_unhold_bss(bss_from_pub(bss));
  87                         cfg80211_put_bss(wiphy, bss);
  88                 }
  89                 return;
  90         }
  91
  92         nl80211_send_rx_assoc(rdev, dev, data);
  93         /* update current_bss etc., consumes the bss reference */
  94         __cfg80211_connect_result(dev, &cr, cr.status == WLAN_STATUS_SUCCESS);
  95 }
  96 EXPORT_SYMBOL(cfg80211_rx_assoc_resp);
  97
  98 static void cfg80211_process_auth(struct wireless_dev *wdev,
  99                                   const u8 *buf, size_t len)
 100 {
 101         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 102
 103         nl80211_send_rx_auth(rdev, wdev->netdev, buf, len, GFP_KERNEL);
 104         cfg80211_sme_rx_auth(wdev, buf, len);
 105 }
 106
 107 static void cfg80211_process_deauth(struct wireless_dev *wdev,
 108                                     const u8 *buf, size_t len,
 109                                     bool reconnect)
 110 {
 111         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 112         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 113         const u8 *bssid = mgmt->bssid;
 114         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
 115         bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr);
 116
 117         nl80211_send_deauth(rdev, wdev->netdev, buf, len, reconnect, GFP_KERNEL);
 118
 119         if (!wdev->connected || !ether_addr_equal(wdev->u.client.connected_addr, bssid))
 120                 return;
 121
 122         __cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap);
 123         cfg80211_sme_deauth(wdev);
 124 }
 125
 126 static void cfg80211_process_disassoc(struct wireless_dev *wdev,
 127                                       const u8 *buf, size_t len,
 128                                       bool reconnect)
 129 {
 130         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 131         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 132         const u8 *bssid = mgmt->bssid;
 133         u16 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
 134         bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr);
 135
 136         nl80211_send_disassoc(rdev, wdev->netdev, buf, len, reconnect,
 137                               GFP_KERNEL);
 138
 139         if (WARN_ON(!wdev->connected ||
 140                     !ether_addr_equal(wdev->u.client.connected_addr, bssid)))
 141                 return;
 142
 143         __cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap);
 144         cfg80211_sme_disassoc(wdev);
 145 }
 146
 147 void cfg80211_rx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len)
 148 {
 149         struct wireless_dev *wdev = dev->ieee80211_ptr;
 150         struct ieee80211_mgmt *mgmt = (void *)buf;
 151
 152         ASSERT_WDEV_LOCK(wdev);
 153
 154         trace_cfg80211_rx_mlme_mgmt(dev, buf, len);
 155
 156         if (WARN_ON(len < 2))
 157                 return;
 158
 159         if (ieee80211_is_auth(mgmt->frame_control))
 160                 cfg80211_process_auth(wdev, buf, len);
 161         else if (ieee80211_is_deauth(mgmt->frame_control))
 162                 cfg80211_process_deauth(wdev, buf, len, false);
 163         else if (ieee80211_is_disassoc(mgmt->frame_control))
 164                 cfg80211_process_disassoc(wdev, buf, len, false);
 165 }
 166 EXPORT_SYMBOL(cfg80211_rx_mlme_mgmt);
 167
 168 void cfg80211_auth_timeout(struct net_device *dev, const u8 *addr)
 169 {
 170         struct wireless_dev *wdev = dev->ieee80211_ptr;
 171         struct wiphy *wiphy = wdev->wiphy;
 172         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 173
 174         trace_cfg80211_send_auth_timeout(dev, addr);
 175
 176         nl80211_send_auth_timeout(rdev, dev, addr, GFP_KERNEL);
 177         cfg80211_sme_auth_timeout(wdev);
 178 }
 179 EXPORT_SYMBOL(cfg80211_auth_timeout);
 180
 181 void cfg80211_assoc_failure(struct net_device *dev,
 182                             struct cfg80211_assoc_failure *data)
 183 {
 184         struct wireless_dev *wdev = dev->ieee80211_ptr;
 185         struct wiphy *wiphy = wdev->wiphy;
 186         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 187         const u8 *addr = data->ap_mld_addr ?: data->bss[0]->bssid;
 188         int i;
 189
 190         trace_cfg80211_send_assoc_failure(dev, data);
 191
 192         if (data->timeout) {
 193                 nl80211_send_assoc_timeout(rdev, dev, addr, GFP_KERNEL);
 194                 cfg80211_sme_assoc_timeout(wdev);
 195         } else {
 196                 cfg80211_sme_abandon_assoc(wdev);
 197         }
 198
 199         for (i = 0; i < ARRAY_SIZE(data->bss); i++) {
 200                 struct cfg80211_bss *bss = data->bss[i];
 201
 202                 if (!bss)
 203                         continue;
 204
 205                 cfg80211_unhold_bss(bss_from_pub(bss));
 206                 cfg80211_put_bss(wiphy, bss);
 207         }
 208 }
 209 EXPORT_SYMBOL(cfg80211_assoc_failure);
 210
 211 void cfg80211_tx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len,
 212                            bool reconnect)
 213 {
 214         struct wireless_dev *wdev = dev->ieee80211_ptr;
 215         struct ieee80211_mgmt *mgmt = (void *)buf;
 216
 217         ASSERT_WDEV_LOCK(wdev);
 218
 219         trace_cfg80211_tx_mlme_mgmt(dev, buf, len, reconnect);
 220
 221         if (WARN_ON(len < 2))
 222                 return;
 223
 224         if (ieee80211_is_deauth(mgmt->frame_control))
 225                 cfg80211_process_deauth(wdev, buf, len, reconnect);
 226         else
 227                 cfg80211_process_disassoc(wdev, buf, len, reconnect);
 228 }
 229 EXPORT_SYMBOL(cfg80211_tx_mlme_mgmt);
 230
 231 void cfg80211_michael_mic_failure(struct net_device *dev, const u8 *addr,
 232                                   enum nl80211_key_type key_type, int key_id,
 233                                   const u8 *tsc, gfp_t gfp)
 234 {
 235         struct wiphy *wiphy = dev->ieee80211_ptr->wiphy;
 236         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 237 #ifdef CONFIG_CFG80211_WEXT
 238         union iwreq_data wrqu;
 239         char *buf = kmalloc(128, gfp);
 240
 241         if (buf) {
 242                 sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
 243                         "keyid=%d %scast addr=%pM)", key_id,
 244                         key_type == NL80211_KEYTYPE_GROUP ? "broad" : "uni",
 245                         addr);
 246                 memset(&wrqu, 0, sizeof(wrqu));
 247                 wrqu.data.length = strlen(buf);
 248                 wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
 249                 kfree(buf);
 250         }
 251 #endif
 252
 253         trace_cfg80211_michael_mic_failure(dev, addr, key_type, key_id, tsc);
 254         nl80211_michael_mic_failure(rdev, dev, addr, key_type, key_id, tsc, gfp);
 255 }
 256 EXPORT_SYMBOL(cfg80211_michael_mic_failure);
 257
 258 /* some MLME handling for userspace SME */
 259 int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 260                        struct net_device *dev,
 261                        struct cfg80211_auth_request *req)
 262 {
 263         struct wireless_dev *wdev = dev->ieee80211_ptr;
 264
 265         ASSERT_WDEV_LOCK(wdev);
 266
 267         if (!req->bss)
 268                 return -ENOENT;
 269
 270         if (req->link_id >= 0 &&
 271             !(wdev->wiphy->flags & WIPHY_FLAG_SUPPORTS_MLO))
 272                 return -EINVAL;
 273
 274         if (req->auth_type == NL80211_AUTHTYPE_SHARED_KEY) {
 275                 if (!req->key || !req->key_len ||
 276                     req->key_idx < 0 || req->key_idx > 3)
 277                         return -EINVAL;
 278         }
 279
 280         if (wdev->connected &&
 281             ether_addr_equal(req->bss->bssid, wdev->u.client.connected_addr))
 282                 return -EALREADY;
 283
 284         return rdev_auth(rdev, dev, req);
 285 }
 286
 287 /*  Do a logical ht_capa &= ht_capa_mask.  */
 288 void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa,
 289                                const struct ieee80211_ht_cap *ht_capa_mask)
 290 {
 291         int i;
 292         u8 *p1, *p2;
 293         if (!ht_capa_mask) {
 294                 memset(ht_capa, 0, sizeof(*ht_capa));
 295                 return;
 296         }
 297
 298         p1 = (u8*)(ht_capa);
 299         p2 = (u8*)(ht_capa_mask);
 300         for (i = 0; i < sizeof(*ht_capa); i++)
 301                 p1[i] &= p2[i];
 302 }
 303
 304 /*  Do a logical vht_capa &= vht_capa_mask.  */
 305 void cfg80211_oper_and_vht_capa(struct ieee80211_vht_cap *vht_capa,
 306                                 const struct ieee80211_vht_cap *vht_capa_mask)
 307 {
 308         int i;
 309         u8 *p1, *p2;
 310         if (!vht_capa_mask) {
 311                 memset(vht_capa, 0, sizeof(*vht_capa));
 312                 return;
 313         }
 314
 315         p1 = (u8*)(vht_capa);
 316         p2 = (u8*)(vht_capa_mask);
 317         for (i = 0; i < sizeof(*vht_capa); i++)
 318                 p1[i] &= p2[i];
 319 }
 320
 321 /* Note: caller must cfg80211_put_bss() regardless of result */
 322 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 323                         struct net_device *dev,
 324                         struct cfg80211_assoc_request *req)
 325 {
 326         struct wireless_dev *wdev = dev->ieee80211_ptr;
 327         int err, i, j;
 328
 329         ASSERT_WDEV_LOCK(wdev);
 330
 331         for (i = 1; i < ARRAY_SIZE(req->links); i++) {
 332                 if (!req->links[i].bss)
 333                         continue;
 334                 for (j = 0; j < i; j++) {
 335                         if (req->links[i].bss == req->links[j].bss)
 336                                 return -EINVAL;
 337                 }
 338         }
 339
 340         if (wdev->connected &&
 341             (!req->prev_bssid ||
 342              !ether_addr_equal(wdev->u.client.connected_addr, req->prev_bssid)))
 343                 return -EALREADY;
 344
 345         cfg80211_oper_and_ht_capa(&req->ht_capa_mask,
 346                                   rdev->wiphy.ht_capa_mod_mask);
 347         cfg80211_oper_and_vht_capa(&req->vht_capa_mask,
 348                                    rdev->wiphy.vht_capa_mod_mask);
 349
 350         err = rdev_assoc(rdev, dev, req);
 351         if (!err) {
 352                 int link_id;
 353
 354                 if (req->bss) {
 355                         cfg80211_ref_bss(&rdev->wiphy, req->bss);
 356                         cfg80211_hold_bss(bss_from_pub(req->bss));
 357                 }
 358
 359                 for (link_id = 0; link_id < ARRAY_SIZE(req->links); link_id++) {
 360                         if (!req->links[link_id].bss)
 361                                 continue;
 362                         cfg80211_ref_bss(&rdev->wiphy, req->links[link_id].bss);
 363                         cfg80211_hold_bss(bss_from_pub(req->links[link_id].bss));
 364                 }
 365         }
 366         return err;
 367 }
 368
 369 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 370                          struct net_device *dev, const u8 *bssid,
 371                          const u8 *ie, int ie_len, u16 reason,
 372                          bool local_state_change)
 373 {
 374         struct wireless_dev *wdev = dev->ieee80211_ptr;
 375         struct cfg80211_deauth_request req = {
 376                 .bssid = bssid,
 377                 .reason_code = reason,
 378                 .ie = ie,
 379                 .ie_len = ie_len,
 380                 .local_state_change = local_state_change,
 381         };
 382
 383         ASSERT_WDEV_LOCK(wdev);
 384
 385         if (local_state_change &&
 386             (!wdev->connected ||
 387              !ether_addr_equal(wdev->u.client.connected_addr, bssid)))
 388                 return 0;
 389
 390         if (ether_addr_equal(wdev->disconnect_bssid, bssid) ||
 391             (wdev->connected &&
 392              ether_addr_equal(wdev->u.client.connected_addr, bssid)))
 393                 wdev->conn_owner_nlportid = 0;
 394
 395         return rdev_deauth(rdev, dev, &req);
 396 }
 397
 398 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
 399                            struct net_device *dev, const u8 *ap_addr,
 400                            const u8 *ie, int ie_len, u16 reason,
 401                            bool local_state_change)
 402 {
 403         struct wireless_dev *wdev = dev->ieee80211_ptr;
 404         struct cfg80211_disassoc_request req = {
 405                 .reason_code = reason,
 406                 .local_state_change = local_state_change,
 407                 .ie = ie,
 408                 .ie_len = ie_len,
 409                 .ap_addr = ap_addr,
 410         };
 411         int err;
 412
 413         ASSERT_WDEV_LOCK(wdev);
 414
 415         if (!wdev->connected)
 416                 return -ENOTCONN;
 417
 418         if (memcmp(wdev->u.client.connected_addr, ap_addr, ETH_ALEN))
 419                 return -ENOTCONN;
 420
 421         err = rdev_disassoc(rdev, dev, &req);
 422         if (err)
 423                 return err;
 424
 425         /* driver should have reported the disassoc */
 426         WARN_ON(wdev->connected);
 427         return 0;
 428 }
 429
 430 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
 431                         struct net_device *dev)
 432 {
 433         struct wireless_dev *wdev = dev->ieee80211_ptr;
 434         u8 bssid[ETH_ALEN];
 435
 436         ASSERT_WDEV_LOCK(wdev);
 437
 438         if (!rdev->ops->deauth)
 439                 return;
 440
 441         if (!wdev->connected)
 442                 return;
 443
 444         memcpy(bssid, wdev->u.client.connected_addr, ETH_ALEN);
 445         cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
 446                              WLAN_REASON_DEAUTH_LEAVING, false);
 447 }
 448
 449 struct cfg80211_mgmt_registration {
 450         struct list_head list;
 451         struct wireless_dev *wdev;
 452
 453         u32 nlportid;
 454
 455         int match_len;
 456
 457         __le16 frame_type;
 458
 459         bool multicast_rx;
 460
 461         u8 match[];
 462 };
 463
 464 static void cfg80211_mgmt_registrations_update(struct wireless_dev *wdev)
 465 {
 466         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 467         struct wireless_dev *tmp;
 468         struct cfg80211_mgmt_registration *reg;
 469         struct mgmt_frame_regs upd = {};
 470
 471         lockdep_assert_held(&rdev->wiphy.mtx);
 472
 473         spin_lock_bh(&rdev->mgmt_registrations_lock);
 474         if (!wdev->mgmt_registrations_need_update) {
 475                 spin_unlock_bh(&rdev->mgmt_registrations_lock);
 476                 return;
 477         }
 478
 479         rcu_read_lock();
 480         list_for_each_entry_rcu(tmp, &rdev->wiphy.wdev_list, list) {
 481                 list_for_each_entry(reg, &tmp->mgmt_registrations, list) {
 482                         u32 mask = BIT(le16_to_cpu(reg->frame_type) >> 4);
 483                         u32 mcast_mask = 0;
 484
 485                         if (reg->multicast_rx)
 486                                 mcast_mask = mask;
 487
 488                         upd.global_stypes |= mask;
 489                         upd.global_mcast_stypes |= mcast_mask;
 490
 491                         if (tmp == wdev) {
 492                                 upd.interface_stypes |= mask;
 493                                 upd.interface_mcast_stypes |= mcast_mask;
 494                         }
 495                 }
 496         }
 497         rcu_read_unlock();
 498
 499         wdev->mgmt_registrations_need_update = 0;
 500         spin_unlock_bh(&rdev->mgmt_registrations_lock);
 501
 502         rdev_update_mgmt_frame_registrations(rdev, wdev, &upd);
 503 }
 504
 505 void cfg80211_mgmt_registrations_update_wk(struct work_struct *wk)
 506 {
 507         struct cfg80211_registered_device *rdev;
 508         struct wireless_dev *wdev;
 509
 510         rdev = container_of(wk, struct cfg80211_registered_device,
 511                             mgmt_registrations_update_wk);
 512
 513         wiphy_lock(&rdev->wiphy);
 514         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
 515                 cfg80211_mgmt_registrations_update(wdev);
 516         wiphy_unlock(&rdev->wiphy);
 517 }
 518
 519 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_portid,
 520                                 u16 frame_type, const u8 *match_data,
 521                                 int match_len, bool multicast_rx,
 522                                 struct netlink_ext_ack *extack)
 523 {
 524         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 525         struct cfg80211_mgmt_registration *reg, *nreg;
 526         int err = 0;
 527         u16 mgmt_type;
 528         bool update_multicast = false;
 529
 530         if (!wdev->wiphy->mgmt_stypes)
 531                 return -EOPNOTSUPP;
 532
 533         if ((frame_type & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT) {
 534                 NL_SET_ERR_MSG(extack, "frame type not management");
 535                 return -EINVAL;
 536         }
 537
 538         if (frame_type & ~(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) {
 539                 NL_SET_ERR_MSG(extack, "Invalid frame type");
 540                 return -EINVAL;
 541         }
 542
 543         mgmt_type = (frame_type & IEEE80211_FCTL_STYPE) >> 4;
 544         if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].rx & BIT(mgmt_type))) {
 545                 NL_SET_ERR_MSG(extack,
 546                                "Registration to specific type not supported");
 547                 return -EINVAL;
 548         }
 549
 550         /*
 551          * To support Pre Association Security Negotiation (PASN), registration
 552          * for authentication frames should be supported. However, as some
 553          * versions of the user space daemons wrongly register to all types of
 554          * authentication frames (which might result in unexpected behavior)
 555          * allow such registration if the request is for a specific
 556          * authentication algorithm number.
 557          */
 558         if (wdev->iftype == NL80211_IFTYPE_STATION &&
 559             (frame_type & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_AUTH &&
 560             !(match_data && match_len >= 2)) {
 561                 NL_SET_ERR_MSG(extack,
 562                                "Authentication algorithm number required");
 563                 return -EINVAL;
 564         }
 565
 566         nreg = kzalloc(sizeof(*reg) + match_len, GFP_KERNEL);
 567         if (!nreg)
 568                 return -ENOMEM;
 569
 570         spin_lock_bh(&rdev->mgmt_registrations_lock);
 571
 572         list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
 573                 int mlen = min(match_len, reg->match_len);
 574
 575                 if (frame_type != le16_to_cpu(reg->frame_type))
 576                         continue;
 577
 578                 if (memcmp(reg->match, match_data, mlen) == 0) {
 579                         if (reg->multicast_rx != multicast_rx) {
 580                                 update_multicast = true;
 581                                 reg->multicast_rx = multicast_rx;
 582                                 break;
 583                         }
 584                         NL_SET_ERR_MSG(extack, "Match already configured");
 585                         err = -EALREADY;
 586                         break;
 587                 }
 588         }
 589
 590         if (err)
 591                 goto out;
 592
 593         if (update_multicast) {
 594                 kfree(nreg);
 595         } else {
 596                 memcpy(nreg->match, match_data, match_len);
 597                 nreg->match_len = match_len;
 598                 nreg->nlportid = snd_portid;
 599                 nreg->frame_type = cpu_to_le16(frame_type);
 600                 nreg->wdev = wdev;
 601                 nreg->multicast_rx = multicast_rx;
 602                 list_add(&nreg->list, &wdev->mgmt_registrations);
 603         }
 604         wdev->mgmt_registrations_need_update = 1;
 605         spin_unlock_bh(&rdev->mgmt_registrations_lock);
 606
 607         cfg80211_mgmt_registrations_update(wdev);
 608
 609         return 0;
 610
 611  out:
 612         kfree(nreg);
 613         spin_unlock_bh(&rdev->mgmt_registrations_lock);
 614
 615         return err;
 616 }
 617
 618 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlportid)
 619 {
 620         struct wiphy *wiphy = wdev->wiphy;
 621         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 622         struct cfg80211_mgmt_registration *reg, *tmp;
 623
 624         spin_lock_bh(&rdev->mgmt_registrations_lock);
 625
 626         list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
 627                 if (reg->nlportid != nlportid)
 628                         continue;
 629
 630                 list_del(&reg->list);
 631                 kfree(reg);
 632
 633                 wdev->mgmt_registrations_need_update = 1;
 634                 schedule_work(&rdev->mgmt_registrations_update_wk);
 635         }
 636
 637         spin_unlock_bh(&rdev->mgmt_registrations_lock);
 638
 639         if (nlportid && rdev->crit_proto_nlportid == nlportid) {
 640                 rdev->crit_proto_nlportid = 0;
 641                 rdev_crit_proto_stop(rdev, wdev);
 642         }
 643
 644         if (nlportid == wdev->ap_unexpected_nlportid)
 645                 wdev->ap_unexpected_nlportid = 0;
 646 }
 647
 648 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev)
 649 {
 650         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 651         struct cfg80211_mgmt_registration *reg, *tmp;
 652
 653         spin_lock_bh(&rdev->mgmt_registrations_lock);
 654         list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
 655                 list_del(&reg->list);
 656                 kfree(reg);
 657         }
 658         wdev->mgmt_registrations_need_update = 1;
 659         spin_unlock_bh(&rdev->mgmt_registrations_lock);
 660
 661         cfg80211_mgmt_registrations_update(wdev);
 662 }
 663
 664 static bool cfg80211_allowed_address(struct wireless_dev *wdev, const u8 *addr)
 665 {
 666         int i;
 667
 668         for_each_valid_link(wdev, i) {
 669                 if (ether_addr_equal(addr, wdev->links[i].addr))
 670                         return true;
 671         }
 672
 673         return ether_addr_equal(addr, wdev_address(wdev));
 674 }
 675
 676 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
 677                           struct wireless_dev *wdev,
 678                           struct cfg80211_mgmt_tx_params *params, u64 *cookie)
 679 {
 680         const struct ieee80211_mgmt *mgmt;
 681         u16 stype;
 682
 683         if (!wdev->wiphy->mgmt_stypes)
 684                 return -EOPNOTSUPP;
 685
 686         if (!rdev->ops->mgmt_tx)
 687                 return -EOPNOTSUPP;
 688
 689         if (params->len < 24 + 1)
 690                 return -EINVAL;
 691
 692         mgmt = (const struct ieee80211_mgmt *)params->buf;
 693
 694         if (!ieee80211_is_mgmt(mgmt->frame_control))
 695                 return -EINVAL;
 696
 697         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 698         if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].tx & BIT(stype >> 4)))
 699                 return -EINVAL;
 700
 701         if (ieee80211_is_action(mgmt->frame_control) &&
 702             mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) {
 703                 int err = 0;
 704
 705                 wdev_lock(wdev);
 706
 707                 switch (wdev->iftype) {
 708                 case NL80211_IFTYPE_ADHOC:
 709                         /*
 710                          * check for IBSS DA must be done by driver as
 711                          * cfg80211 doesn't track the stations
 712                          */
 713                         if (!wdev->u.ibss.current_bss ||
 714                             !ether_addr_equal(wdev->u.ibss.current_bss->pub.bssid,
 715                                               mgmt->bssid)) {
 716                                 err = -ENOTCONN;
 717                                 break;
 718                         }
 719                         break;
 720                 case NL80211_IFTYPE_STATION:
 721                 case NL80211_IFTYPE_P2P_CLIENT:
 722                         if (!wdev->connected) {
 723                                 err = -ENOTCONN;
 724                                 break;
 725                         }
 726
 727                         /* FIXME: MLD may address this differently */
 728
 729                         if (!ether_addr_equal(wdev->u.client.connected_addr,
 730                                               mgmt->bssid)) {
 731                                 err = -ENOTCONN;
 732                                 break;
 733                         }
 734
 735                         /* for station, check that DA is the AP */
 736                         if (!ether_addr_equal(wdev->u.client.connected_addr,
 737                                               mgmt->da)) {
 738                                 err = -ENOTCONN;
 739                                 break;
 740                         }
 741                         break;
 742                 case NL80211_IFTYPE_AP:
 743                 case NL80211_IFTYPE_P2P_GO:
 744                 case NL80211_IFTYPE_AP_VLAN:
 745                         if (!ether_addr_equal(mgmt->bssid, wdev_address(wdev)))
 746                                 err = -EINVAL;
 747                         break;
 748                 case NL80211_IFTYPE_MESH_POINT:
 749                         if (!ether_addr_equal(mgmt->sa, mgmt->bssid)) {
 750                                 err = -EINVAL;
 751                                 break;
 752                         }
 753                         /*
 754                          * check for mesh DA must be done by driver as
 755                          * cfg80211 doesn't track the stations
 756                          */
 757                         break;
 758                 case NL80211_IFTYPE_P2P_DEVICE:
 759                         /*
 760                          * fall through, P2P device only supports
 761                          * public action frames
 762                          */
 763                 case NL80211_IFTYPE_NAN:
 764                 default:
 765                         err = -EOPNOTSUPP;
 766                         break;
 767                 }
 768                 wdev_unlock(wdev);
 769
 770                 if (err)
 771                         return err;
 772         }
 773
 774         if (!cfg80211_allowed_address(wdev, mgmt->sa)) {
 775                 /* Allow random TA to be used with Public Action frames if the
 776                  * driver has indicated support for this. Otherwise, only allow
 777                  * the local address to be used.
 778                  */
 779                 if (!ieee80211_is_action(mgmt->frame_control) ||
 780                     mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
 781                         return -EINVAL;
 782                 if (!wdev->connected &&
 783                     !wiphy_ext_feature_isset(
 784                             &rdev->wiphy,
 785                             NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA))
 786                         return -EINVAL;
 787                 if (wdev->connected &&
 788                     !wiphy_ext_feature_isset(
 789                             &rdev->wiphy,
 790                             NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA_CONNECTED))
 791                         return -EINVAL;
 792         }
 793
 794         /* Transmit the management frame as requested by user space */
 795         return rdev_mgmt_tx(rdev, wdev, params, cookie);
 796 }
 797
 798 bool cfg80211_rx_mgmt_ext(struct wireless_dev *wdev,
 799                           struct cfg80211_rx_info *info)
 800 {
 801         struct wiphy *wiphy = wdev->wiphy;
 802         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 803         struct cfg80211_mgmt_registration *reg;
 804         const struct ieee80211_txrx_stypes *stypes =
 805                 &wiphy->mgmt_stypes[wdev->iftype];
 806         struct ieee80211_mgmt *mgmt = (void *)info->buf;
 807         const u8 *data;
 808         int data_len;
 809         bool result = false;
 810         __le16 ftype = mgmt->frame_control &
 811                 cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE);
 812         u16 stype;
 813
 814         trace_cfg80211_rx_mgmt(wdev, info);
 815         stype = (le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE) >> 4;
 816
 817         if (!(stypes->rx & BIT(stype))) {
 818                 trace_cfg80211_return_bool(false);
 819                 return false;
 820         }
 821
 822         data = info->buf + ieee80211_hdrlen(mgmt->frame_control);
 823         data_len = info->len - ieee80211_hdrlen(mgmt->frame_control);
 824
 825         spin_lock_bh(&rdev->mgmt_registrations_lock);
 826
 827         list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
 828                 if (reg->frame_type != ftype)
 829                         continue;
 830
 831                 if (reg->match_len > data_len)
 832                         continue;
 833
 834                 if (memcmp(reg->match, data, reg->match_len))
 835                         continue;
 836
 837                 /* found match! */
 838
 839                 /* Indicate the received Action frame to user space */
 840                 if (nl80211_send_mgmt(rdev, wdev, reg->nlportid, info,
 841                                       GFP_ATOMIC))
 842                         continue;
 843
 844                 result = true;
 845                 break;
 846         }
 847
 848         spin_unlock_bh(&rdev->mgmt_registrations_lock);
 849
 850         trace_cfg80211_return_bool(result);
 851         return result;
 852 }
 853 EXPORT_SYMBOL(cfg80211_rx_mgmt_ext);
 854
 855 void cfg80211_sched_dfs_chan_update(struct cfg80211_registered_device *rdev)
 856 {
 857         cancel_delayed_work(&rdev->dfs_update_channels_wk);
 858         queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk, 0);
 859 }
 860
 861 void cfg80211_dfs_channels_update_work(struct work_struct *work)
 862 {
 863         struct delayed_work *delayed_work = to_delayed_work(work);
 864         struct cfg80211_registered_device *rdev;
 865         struct cfg80211_chan_def chandef;
 866         struct ieee80211_supported_band *sband;
 867         struct ieee80211_channel *c;
 868         struct wiphy *wiphy;
 869         bool check_again = false;
 870         unsigned long timeout, next_time = 0;
 871         unsigned long time_dfs_update;
 872         enum nl80211_radar_event radar_event;
 873         int bandid, i;
 874
 875         rdev = container_of(delayed_work, struct cfg80211_registered_device,
 876                             dfs_update_channels_wk);
 877         wiphy = &rdev->wiphy;
 878
 879         rtnl_lock();
 880         for (bandid = 0; bandid < NUM_NL80211_BANDS; bandid++) {
 881                 sband = wiphy->bands[bandid];
 882                 if (!sband)
 883                         continue;
 884
 885                 for (i = 0; i < sband->n_channels; i++) {
 886                         c = &sband->channels[i];
 887
 888                         if (!(c->flags & IEEE80211_CHAN_RADAR))
 889                                 continue;
 890
 891                         if (c->dfs_state != NL80211_DFS_UNAVAILABLE &&
 892                             c->dfs_state != NL80211_DFS_AVAILABLE)
 893                                 continue;
 894
 895                         if (c->dfs_state == NL80211_DFS_UNAVAILABLE) {
 896                                 time_dfs_update = IEEE80211_DFS_MIN_NOP_TIME_MS;
 897                                 radar_event = NL80211_RADAR_NOP_FINISHED;
 898                         } else {
 899                                 if (regulatory_pre_cac_allowed(wiphy) ||
 900                                     cfg80211_any_wiphy_oper_chan(wiphy, c))
 901                                         continue;
 902
 903                                 time_dfs_update = REG_PRE_CAC_EXPIRY_GRACE_MS;
 904                                 radar_event = NL80211_RADAR_PRE_CAC_EXPIRED;
 905                         }
 906
 907                         timeout = c->dfs_state_entered +
 908                                   msecs_to_jiffies(time_dfs_update);
 909
 910                         if (time_after_eq(jiffies, timeout)) {
 911                                 c->dfs_state = NL80211_DFS_USABLE;
 912                                 c->dfs_state_entered = jiffies;
 913
 914                                 cfg80211_chandef_create(&chandef, c,
 915                                                         NL80211_CHAN_NO_HT);
 916
 917                                 nl80211_radar_notify(rdev, &chandef,
 918                                                      radar_event, NULL,
 919                                                      GFP_ATOMIC);
 920
 921                                 regulatory_propagate_dfs_state(wiphy, &chandef,
 922                                                                c->dfs_state,
 923                                                                radar_event);
 924                                 continue;
 925                         }
 926
 927                         if (!check_again)
 928                                 next_time = timeout - jiffies;
 929                         else
 930                                 next_time = min(next_time, timeout - jiffies);
 931                         check_again = true;
 932                 }
 933         }
 934         rtnl_unlock();
 935
 936         /* reschedule if there are other channels waiting to be cleared again */
 937         if (check_again)
 938                 queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
 939                                    next_time);
 940 }
 941
 942
 943 void __cfg80211_radar_event(struct wiphy *wiphy,
 944                             struct cfg80211_chan_def *chandef,
 945                             bool offchan, gfp_t gfp)
 946 {
 947         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 948
 949         trace_cfg80211_radar_event(wiphy, chandef, offchan);
 950
 951         /* only set the chandef supplied channel to unavailable, in
 952          * case the radar is detected on only one of multiple channels
 953          * spanned by the chandef.
 954          */
 955         cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_UNAVAILABLE);
 956
 957         if (offchan)
 958                 queue_work(cfg80211_wq, &rdev->background_cac_abort_wk);
 959
 960         cfg80211_sched_dfs_chan_update(rdev);
 961
 962         nl80211_radar_notify(rdev, chandef, NL80211_RADAR_DETECTED, NULL, gfp);
 963
 964         memcpy(&rdev->radar_chandef, chandef, sizeof(struct cfg80211_chan_def));
 965         queue_work(cfg80211_wq, &rdev->propagate_radar_detect_wk);
 966 }
 967 EXPORT_SYMBOL(__cfg80211_radar_event);
 968
 969 void cfg80211_cac_event(struct net_device *netdev,
 970                         const struct cfg80211_chan_def *chandef,
 971                         enum nl80211_radar_event event, gfp_t gfp)
 972 {
 973         struct wireless_dev *wdev = netdev->ieee80211_ptr;
 974         struct wiphy *wiphy = wdev->wiphy;
 975         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 976         unsigned long timeout;
 977
 978         /* not yet supported */
 979         if (wdev->valid_links)
 980                 return;
 981
 982         trace_cfg80211_cac_event(netdev, event);
 983
 984         if (WARN_ON(!wdev->cac_started && event != NL80211_RADAR_CAC_STARTED))
 985                 return;
 986
 987         switch (event) {
 988         case NL80211_RADAR_CAC_FINISHED:
 989                 timeout = wdev->cac_start_time +
 990                           msecs_to_jiffies(wdev->cac_time_ms);
 991                 WARN_ON(!time_after_eq(jiffies, timeout));
 992                 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
 993                 memcpy(&rdev->cac_done_chandef, chandef,
 994                        sizeof(struct cfg80211_chan_def));
 995                 queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk);
 996                 cfg80211_sched_dfs_chan_update(rdev);
 997                 fallthrough;
 998         case NL80211_RADAR_CAC_ABORTED:
 999                 wdev->cac_started = false;
1000                 break;
1001         case NL80211_RADAR_CAC_STARTED:
1002                 wdev->cac_started = true;
1003                 break;
1004         default:
1005                 WARN_ON(1);
1006                 return;
1007         }
1008
1009         nl80211_radar_notify(rdev, chandef, event, netdev, gfp);
1010 }
1011 EXPORT_SYMBOL(cfg80211_cac_event);
1012
1013 static void
1014 __cfg80211_background_cac_event(struct cfg80211_registered_device *rdev,
1015                                 struct wireless_dev *wdev,
1016                                 const struct cfg80211_chan_def *chandef,
1017                                 enum nl80211_radar_event event)
1018 {
1019         struct wiphy *wiphy = &rdev->wiphy;
1020         struct net_device *netdev;
1021
1022         lockdep_assert_wiphy(&rdev->wiphy);
1023
1024         if (!cfg80211_chandef_valid(chandef))
1025                 return;
1026
1027         if (!rdev->background_radar_wdev)
1028                 return;
1029
1030         switch (event) {
1031         case NL80211_RADAR_CAC_FINISHED:
1032                 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
1033                 memcpy(&rdev->cac_done_chandef, chandef, sizeof(*chandef));
1034                 queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk);
1035                 cfg80211_sched_dfs_chan_update(rdev);
1036                 wdev = rdev->background_radar_wdev;
1037                 break;
1038         case NL80211_RADAR_CAC_ABORTED:
1039                 if (!cancel_delayed_work(&rdev->background_cac_done_wk))
1040                         return;
1041                 wdev = rdev->background_radar_wdev;
1042                 break;
1043         case NL80211_RADAR_CAC_STARTED:
1044                 break;
1045         default:
1046                 return;
1047         }
1048
1049         netdev = wdev ? wdev->netdev : NULL;
1050         nl80211_radar_notify(rdev, chandef, event, netdev, GFP_KERNEL);
1051 }
1052
1053 static void
1054 cfg80211_background_cac_event(struct cfg80211_registered_device *rdev,
1055                               const struct cfg80211_chan_def *chandef,
1056                               enum nl80211_radar_event event)
1057 {
1058         wiphy_lock(&rdev->wiphy);
1059         __cfg80211_background_cac_event(rdev, rdev->background_radar_wdev,
1060                                         chandef, event);
1061         wiphy_unlock(&rdev->wiphy);
1062 }
1063
1064 void cfg80211_background_cac_done_wk(struct work_struct *work)
1065 {
1066         struct delayed_work *delayed_work = to_delayed_work(work);
1067         struct cfg80211_registered_device *rdev;
1068
1069         rdev = container_of(delayed_work, struct cfg80211_registered_device,
1070                             background_cac_done_wk);
1071         cfg80211_background_cac_event(rdev, &rdev->background_radar_chandef,
1072                                       NL80211_RADAR_CAC_FINISHED);
1073 }
1074
1075 void cfg80211_background_cac_abort_wk(struct work_struct *work)
1076 {
1077         struct cfg80211_registered_device *rdev;
1078
1079         rdev = container_of(work, struct cfg80211_registered_device,
1080                             background_cac_abort_wk);
1081         cfg80211_background_cac_event(rdev, &rdev->background_radar_chandef,
1082                                       NL80211_RADAR_CAC_ABORTED);
1083 }
1084
1085 void cfg80211_background_cac_abort(struct wiphy *wiphy)
1086 {
1087         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1088
1089         queue_work(cfg80211_wq, &rdev->background_cac_abort_wk);
1090 }
1091 EXPORT_SYMBOL(cfg80211_background_cac_abort);
1092
1093 int
1094 cfg80211_start_background_radar_detection(struct cfg80211_registered_device *rdev,
1095                                           struct wireless_dev *wdev,
1096                                           struct cfg80211_chan_def *chandef)
1097 {
1098         unsigned int cac_time_ms;
1099         int err;
1100
1101         lockdep_assert_wiphy(&rdev->wiphy);
1102
1103         if (!wiphy_ext_feature_isset(&rdev->wiphy,
1104                                      NL80211_EXT_FEATURE_RADAR_BACKGROUND))
1105                 return -EOPNOTSUPP;
1106
1107         /* Offchannel chain already locked by another wdev */
1108         if (rdev->background_radar_wdev && rdev->background_radar_wdev != wdev)
1109                 return -EBUSY;
1110
1111         /* CAC already in progress on the offchannel chain */
1112         if (rdev->background_radar_wdev == wdev &&
1113             delayed_work_pending(&rdev->background_cac_done_wk))
1114                 return -EBUSY;
1115
1116         err = rdev_set_radar_background(rdev, chandef);
1117         if (err)
1118                 return err;
1119
1120         cac_time_ms = cfg80211_chandef_dfs_cac_time(&rdev->wiphy, chandef);
1121         if (!cac_time_ms)
1122                 cac_time_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
1123
1124         rdev->background_radar_chandef = *chandef;
1125         rdev->background_radar_wdev = wdev; /* Get offchain ownership */
1126
1127         __cfg80211_background_cac_event(rdev, wdev, chandef,
1128                                         NL80211_RADAR_CAC_STARTED);
1129         queue_delayed_work(cfg80211_wq, &rdev->background_cac_done_wk,
1130                            msecs_to_jiffies(cac_time_ms));
1131
1132         return 0;
1133 }
1134
1135 void cfg80211_stop_background_radar_detection(struct wireless_dev *wdev)
1136 {
1137         struct wiphy *wiphy = wdev->wiphy;
1138         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1139
1140         lockdep_assert_wiphy(wiphy);
1141
1142         if (wdev != rdev->background_radar_wdev)
1143                 return;
1144
1145         rdev_set_radar_background(rdev, NULL);
1146         rdev->background_radar_wdev = NULL; /* Release offchain ownership */
1147
1148         __cfg80211_background_cac_event(rdev, wdev,
1149                                         &rdev->background_radar_chandef,
1150                                         NL80211_RADAR_CAC_ABORTED);
1151 }