net/wireless/mlme.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * cfg80211 MLME SAP interface
   4  *
   5  * Copyright (c) 2009, Jouni Malinen <[email protected]>
   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 static bool cfg80211_allowed_random_address(struct wireless_dev *wdev,
 677                                             const struct ieee80211_mgmt *mgmt)
 678 {
 679         if (ieee80211_is_auth(mgmt->frame_control) ||
 680             ieee80211_is_deauth(mgmt->frame_control)) {
 681                 /* Allow random TA to be used with authentication and
 682                  * deauthentication frames if the driver has indicated support.
 683                  */
 684                 if (wiphy_ext_feature_isset(
 685                             wdev->wiphy,
 686                             NL80211_EXT_FEATURE_AUTH_AND_DEAUTH_RANDOM_TA))
 687                         return true;
 688         } else if (ieee80211_is_action(mgmt->frame_control) &&
 689                    mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
 690                 /* Allow random TA to be used with Public Action frames if the
 691                  * driver has indicated support.
 692                  */
 693                 if (!wdev->connected &&
 694                     wiphy_ext_feature_isset(
 695                             wdev->wiphy,
 696                             NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA))
 697                         return true;
 698
 699                 if (wdev->connected &&
 700                     wiphy_ext_feature_isset(
 701                             wdev->wiphy,
 702                             NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA_CONNECTED))
 703                         return true;
 704         }
 705
 706         return false;
 707 }
 708
 709 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
 710                           struct wireless_dev *wdev,
 711                           struct cfg80211_mgmt_tx_params *params, u64 *cookie)
 712 {
 713         const struct ieee80211_mgmt *mgmt;
 714         u16 stype;
 715
 716         if (!wdev->wiphy->mgmt_stypes)
 717                 return -EOPNOTSUPP;
 718
 719         if (!rdev->ops->mgmt_tx)
 720                 return -EOPNOTSUPP;
 721
 722         if (params->len < 24 + 1)
 723                 return -EINVAL;
 724
 725         mgmt = (const struct ieee80211_mgmt *)params->buf;
 726
 727         if (!ieee80211_is_mgmt(mgmt->frame_control))
 728                 return -EINVAL;
 729
 730         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 731         if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].tx & BIT(stype >> 4)))
 732                 return -EINVAL;
 733
 734         if (ieee80211_is_action(mgmt->frame_control) &&
 735             mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) {
 736                 int err = 0;
 737
 738                 wdev_lock(wdev);
 739
 740                 switch (wdev->iftype) {
 741                 case NL80211_IFTYPE_ADHOC:
 742                         /*
 743                          * check for IBSS DA must be done by driver as
 744                          * cfg80211 doesn't track the stations
 745                          */
 746                         if (!wdev->u.ibss.current_bss ||
 747                             !ether_addr_equal(wdev->u.ibss.current_bss->pub.bssid,
 748                                               mgmt->bssid)) {
 749                                 err = -ENOTCONN;
 750                                 break;
 751                         }
 752                         break;
 753                 case NL80211_IFTYPE_STATION:
 754                 case NL80211_IFTYPE_P2P_CLIENT:
 755                         if (!wdev->connected) {
 756                                 err = -ENOTCONN;
 757                                 break;
 758                         }
 759
 760                         /* FIXME: MLD may address this differently */
 761
 762                         if (!ether_addr_equal(wdev->u.client.connected_addr,
 763                                               mgmt->bssid)) {
 764                                 err = -ENOTCONN;
 765                                 break;
 766                         }
 767
 768                         /* for station, check that DA is the AP */
 769                         if (!ether_addr_equal(wdev->u.client.connected_addr,
 770                                               mgmt->da)) {
 771                                 err = -ENOTCONN;
 772                                 break;
 773                         }
 774                         break;
 775                 case NL80211_IFTYPE_AP:
 776                 case NL80211_IFTYPE_P2P_GO:
 777                 case NL80211_IFTYPE_AP_VLAN:
 778                         if (!ether_addr_equal(mgmt->bssid, wdev_address(wdev)) &&
 779                             (params->link_id < 0 ||
 780                              !ether_addr_equal(mgmt->bssid,
 781                                                wdev->links[params->link_id].addr)))
 782                                 err = -EINVAL;
 783                         break;
 784                 case NL80211_IFTYPE_MESH_POINT:
 785                         if (!ether_addr_equal(mgmt->sa, mgmt->bssid)) {
 786                                 err = -EINVAL;
 787                                 break;
 788                         }
 789                         /*
 790                          * check for mesh DA must be done by driver as
 791                          * cfg80211 doesn't track the stations
 792                          */
 793                         break;
 794                 case NL80211_IFTYPE_P2P_DEVICE:
 795                         /*
 796                          * fall through, P2P device only supports
 797                          * public action frames
 798                          */
 799                 case NL80211_IFTYPE_NAN:
 800                 default:
 801                         err = -EOPNOTSUPP;
 802                         break;
 803                 }
 804                 wdev_unlock(wdev);
 805
 806                 if (err)
 807                         return err;
 808         }
 809
 810         if (!cfg80211_allowed_address(wdev, mgmt->sa) &&
 811             !cfg80211_allowed_random_address(wdev, mgmt))
 812                 return -EINVAL;
 813
 814         /* Transmit the management frame as requested by user space */
 815         return rdev_mgmt_tx(rdev, wdev, params, cookie);
 816 }
 817
 818 bool cfg80211_rx_mgmt_ext(struct wireless_dev *wdev,
 819                           struct cfg80211_rx_info *info)
 820 {
 821         struct wiphy *wiphy = wdev->wiphy;
 822         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 823         struct cfg80211_mgmt_registration *reg;
 824         const struct ieee80211_txrx_stypes *stypes =
 825                 &wiphy->mgmt_stypes[wdev->iftype];
 826         struct ieee80211_mgmt *mgmt = (void *)info->buf;
 827         const u8 *data;
 828         int data_len;
 829         bool result = false;
 830         __le16 ftype = mgmt->frame_control &
 831                 cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE);
 832         u16 stype;
 833
 834         trace_cfg80211_rx_mgmt(wdev, info);
 835         stype = (le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE) >> 4;
 836
 837         if (!(stypes->rx & BIT(stype))) {
 838                 trace_cfg80211_return_bool(false);
 839                 return false;
 840         }
 841
 842         data = info->buf + ieee80211_hdrlen(mgmt->frame_control);
 843         data_len = info->len - ieee80211_hdrlen(mgmt->frame_control);
 844
 845         spin_lock_bh(&rdev->mgmt_registrations_lock);
 846
 847         list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
 848                 if (reg->frame_type != ftype)
 849                         continue;
 850
 851                 if (reg->match_len > data_len)
 852                         continue;
 853
 854                 if (memcmp(reg->match, data, reg->match_len))
 855                         continue;
 856
 857                 /* found match! */
 858
 859                 /* Indicate the received Action frame to user space */
 860                 if (nl80211_send_mgmt(rdev, wdev, reg->nlportid, info,
 861                                       GFP_ATOMIC))
 862                         continue;
 863
 864                 result = true;
 865                 break;
 866         }
 867
 868         spin_unlock_bh(&rdev->mgmt_registrations_lock);
 869
 870         trace_cfg80211_return_bool(result);
 871         return result;
 872 }
 873 EXPORT_SYMBOL(cfg80211_rx_mgmt_ext);
 874
 875 void cfg80211_sched_dfs_chan_update(struct cfg80211_registered_device *rdev)
 876 {
 877         cancel_delayed_work(&rdev->dfs_update_channels_wk);
 878         queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk, 0);
 879 }
 880
 881 void cfg80211_dfs_channels_update_work(struct work_struct *work)
 882 {
 883         struct delayed_work *delayed_work = to_delayed_work(work);
 884         struct cfg80211_registered_device *rdev;
 885         struct cfg80211_chan_def chandef;
 886         struct ieee80211_supported_band *sband;
 887         struct ieee80211_channel *c;
 888         struct wiphy *wiphy;
 889         bool check_again = false;
 890         unsigned long timeout, next_time = 0;
 891         unsigned long time_dfs_update;
 892         enum nl80211_radar_event radar_event;
 893         int bandid, i;
 894
 895         rdev = container_of(delayed_work, struct cfg80211_registered_device,
 896                             dfs_update_channels_wk);
 897         wiphy = &rdev->wiphy;
 898
 899         rtnl_lock();
 900         for (bandid = 0; bandid < NUM_NL80211_BANDS; bandid++) {
 901                 sband = wiphy->bands[bandid];
 902                 if (!sband)
 903                         continue;
 904
 905                 for (i = 0; i < sband->n_channels; i++) {
 906                         c = &sband->channels[i];
 907
 908                         if (!(c->flags & IEEE80211_CHAN_RADAR))
 909                                 continue;
 910
 911                         if (c->dfs_state != NL80211_DFS_UNAVAILABLE &&
 912                             c->dfs_state != NL80211_DFS_AVAILABLE)
 913                                 continue;
 914
 915                         if (c->dfs_state == NL80211_DFS_UNAVAILABLE) {
 916                                 time_dfs_update = IEEE80211_DFS_MIN_NOP_TIME_MS;
 917                                 radar_event = NL80211_RADAR_NOP_FINISHED;
 918                         } else {
 919                                 if (regulatory_pre_cac_allowed(wiphy) ||
 920                                     cfg80211_any_wiphy_oper_chan(wiphy, c))
 921                                         continue;
 922
 923                                 time_dfs_update = REG_PRE_CAC_EXPIRY_GRACE_MS;
 924                                 radar_event = NL80211_RADAR_PRE_CAC_EXPIRED;
 925                         }
 926
 927                         timeout = c->dfs_state_entered +
 928                                   msecs_to_jiffies(time_dfs_update);
 929
 930                         if (time_after_eq(jiffies, timeout)) {
 931                                 c->dfs_state = NL80211_DFS_USABLE;
 932                                 c->dfs_state_entered = jiffies;
 933
 934                                 cfg80211_chandef_create(&chandef, c,
 935                                                         NL80211_CHAN_NO_HT);
 936
 937                                 nl80211_radar_notify(rdev, &chandef,
 938                                                      radar_event, NULL,
 939                                                      GFP_ATOMIC);
 940
 941                                 regulatory_propagate_dfs_state(wiphy, &chandef,
 942                                                                c->dfs_state,
 943                                                                radar_event);
 944                                 continue;
 945                         }
 946
 947                         if (!check_again)
 948                                 next_time = timeout - jiffies;
 949                         else
 950                                 next_time = min(next_time, timeout - jiffies);
 951                         check_again = true;
 952                 }
 953         }
 954         rtnl_unlock();
 955
 956         /* reschedule if there are other channels waiting to be cleared again */
 957         if (check_again)
 958                 queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
 959                                    next_time);
 960 }
 961
 962
 963 void __cfg80211_radar_event(struct wiphy *wiphy,
 964                             struct cfg80211_chan_def *chandef,
 965                             bool offchan, gfp_t gfp)
 966 {
 967         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 968
 969         trace_cfg80211_radar_event(wiphy, chandef, offchan);
 970
 971         /* only set the chandef supplied channel to unavailable, in
 972          * case the radar is detected on only one of multiple channels
 973          * spanned by the chandef.
 974          */
 975         cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_UNAVAILABLE);
 976
 977         if (offchan)
 978                 queue_work(cfg80211_wq, &rdev->background_cac_abort_wk);
 979
 980         cfg80211_sched_dfs_chan_update(rdev);
 981
 982         nl80211_radar_notify(rdev, chandef, NL80211_RADAR_DETECTED, NULL, gfp);
 983
 984         memcpy(&rdev->radar_chandef, chandef, sizeof(struct cfg80211_chan_def));
 985         queue_work(cfg80211_wq, &rdev->propagate_radar_detect_wk);
 986 }
 987 EXPORT_SYMBOL(__cfg80211_radar_event);
 988
 989 void cfg80211_cac_event(struct net_device *netdev,
 990                         const struct cfg80211_chan_def *chandef,
 991                         enum nl80211_radar_event event, gfp_t gfp)
 992 {
 993         struct wireless_dev *wdev = netdev->ieee80211_ptr;
 994         struct wiphy *wiphy = wdev->wiphy;
 995         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 996         unsigned long timeout;
 997
 998         /* not yet supported */
 999         if (wdev->valid_links)
1000                 return;
1001
1002         trace_cfg80211_cac_event(netdev, event);
1003
1004         if (WARN_ON(!wdev->cac_started && event != NL80211_RADAR_CAC_STARTED))
1005                 return;
1006
1007         switch (event) {
1008         case NL80211_RADAR_CAC_FINISHED:
1009                 timeout = wdev->cac_start_time +
1010                           msecs_to_jiffies(wdev->cac_time_ms);
1011                 WARN_ON(!time_after_eq(jiffies, timeout));
1012                 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
1013                 memcpy(&rdev->cac_done_chandef, chandef,
1014                        sizeof(struct cfg80211_chan_def));
1015                 queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk);
1016                 cfg80211_sched_dfs_chan_update(rdev);
1017                 fallthrough;
1018         case NL80211_RADAR_CAC_ABORTED:
1019                 wdev->cac_started = false;
1020                 break;
1021         case NL80211_RADAR_CAC_STARTED:
1022                 wdev->cac_started = true;
1023                 break;
1024         default:
1025                 WARN_ON(1);
1026                 return;
1027         }
1028
1029         nl80211_radar_notify(rdev, chandef, event, netdev, gfp);
1030 }
1031 EXPORT_SYMBOL(cfg80211_cac_event);
1032
1033 static void
1034 __cfg80211_background_cac_event(struct cfg80211_registered_device *rdev,
1035                                 struct wireless_dev *wdev,
1036                                 const struct cfg80211_chan_def *chandef,
1037                                 enum nl80211_radar_event event)
1038 {
1039         struct wiphy *wiphy = &rdev->wiphy;
1040         struct net_device *netdev;
1041
1042         lockdep_assert_wiphy(&rdev->wiphy);
1043
1044         if (!cfg80211_chandef_valid(chandef))
1045                 return;
1046
1047         if (!rdev->background_radar_wdev)
1048                 return;
1049
1050         switch (event) {
1051         case NL80211_RADAR_CAC_FINISHED:
1052                 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
1053                 memcpy(&rdev->cac_done_chandef, chandef, sizeof(*chandef));
1054                 queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk);
1055                 cfg80211_sched_dfs_chan_update(rdev);
1056                 wdev = rdev->background_radar_wdev;
1057                 break;
1058         case NL80211_RADAR_CAC_ABORTED:
1059                 if (!cancel_delayed_work(&rdev->background_cac_done_wk))
1060                         return;
1061                 wdev = rdev->background_radar_wdev;
1062                 break;
1063         case NL80211_RADAR_CAC_STARTED:
1064                 break;
1065         default:
1066                 return;
1067         }
1068
1069         netdev = wdev ? wdev->netdev : NULL;
1070         nl80211_radar_notify(rdev, chandef, event, netdev, GFP_KERNEL);
1071 }
1072
1073 static void
1074 cfg80211_background_cac_event(struct cfg80211_registered_device *rdev,
1075                               const struct cfg80211_chan_def *chandef,
1076                               enum nl80211_radar_event event)
1077 {
1078         wiphy_lock(&rdev->wiphy);
1079         __cfg80211_background_cac_event(rdev, rdev->background_radar_wdev,
1080                                         chandef, event);
1081         wiphy_unlock(&rdev->wiphy);
1082 }
1083
1084 void cfg80211_background_cac_done_wk(struct work_struct *work)
1085 {
1086         struct delayed_work *delayed_work = to_delayed_work(work);
1087         struct cfg80211_registered_device *rdev;
1088
1089         rdev = container_of(delayed_work, struct cfg80211_registered_device,
1090                             background_cac_done_wk);
1091         cfg80211_background_cac_event(rdev, &rdev->background_radar_chandef,
1092                                       NL80211_RADAR_CAC_FINISHED);
1093 }
1094
1095 void cfg80211_background_cac_abort_wk(struct work_struct *work)
1096 {
1097         struct cfg80211_registered_device *rdev;
1098
1099         rdev = container_of(work, struct cfg80211_registered_device,
1100                             background_cac_abort_wk);
1101         cfg80211_background_cac_event(rdev, &rdev->background_radar_chandef,
1102                                       NL80211_RADAR_CAC_ABORTED);
1103 }
1104
1105 void cfg80211_background_cac_abort(struct wiphy *wiphy)
1106 {
1107         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1108
1109         queue_work(cfg80211_wq, &rdev->background_cac_abort_wk);
1110 }
1111 EXPORT_SYMBOL(cfg80211_background_cac_abort);
1112
1113 int
1114 cfg80211_start_background_radar_detection(struct cfg80211_registered_device *rdev,
1115                                           struct wireless_dev *wdev,
1116                                           struct cfg80211_chan_def *chandef)
1117 {
1118         unsigned int cac_time_ms;
1119         int err;
1120
1121         lockdep_assert_wiphy(&rdev->wiphy);
1122
1123         if (!wiphy_ext_feature_isset(&rdev->wiphy,
1124                                      NL80211_EXT_FEATURE_RADAR_BACKGROUND))
1125                 return -EOPNOTSUPP;
1126
1127         /* Offchannel chain already locked by another wdev */
1128         if (rdev->background_radar_wdev && rdev->background_radar_wdev != wdev)
1129                 return -EBUSY;
1130
1131         /* CAC already in progress on the offchannel chain */
1132         if (rdev->background_radar_wdev == wdev &&
1133             delayed_work_pending(&rdev->background_cac_done_wk))
1134                 return -EBUSY;
1135
1136         err = rdev_set_radar_background(rdev, chandef);
1137         if (err)
1138                 return err;
1139
1140         cac_time_ms = cfg80211_chandef_dfs_cac_time(&rdev->wiphy, chandef);
1141         if (!cac_time_ms)
1142                 cac_time_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
1143
1144         rdev->background_radar_chandef = *chandef;
1145         rdev->background_radar_wdev = wdev; /* Get offchain ownership */
1146
1147         __cfg80211_background_cac_event(rdev, wdev, chandef,
1148                                         NL80211_RADAR_CAC_STARTED);
1149         queue_delayed_work(cfg80211_wq, &rdev->background_cac_done_wk,
1150                            msecs_to_jiffies(cac_time_ms));
1151
1152         return 0;
1153 }
1154
1155 void cfg80211_stop_background_radar_detection(struct wireless_dev *wdev)
1156 {
1157         struct wiphy *wiphy = wdev->wiphy;
1158         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1159
1160         lockdep_assert_wiphy(wiphy);
1161
1162         if (wdev != rdev->background_radar_wdev)
1163                 return;
1164
1165         rdev_set_radar_background(rdev, NULL);
1166         rdev->background_radar_wdev = NULL; /* Release offchain ownership */
1167
1168         __cfg80211_background_cac_event(rdev, wdev,
1169                                         &rdev->background_radar_chandef,
1170                                         NL80211_RADAR_CAC_ABORTED);
1171 }