net/wireless/mlme.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * cfg80211 MLME SAP interface
   4  *
   5  * Copyright (c) 2009, Jouni Malinen <j@w1.fi>
   6  * Copyright (c) 2015           Intel Deutschland GmbH
   7  * Copyright (C) 2019-2020 Intel Corporation
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/etherdevice.h>
  13 #include <linux/netdevice.h>
  14 #include <linux/nl80211.h>
  15 #include <linux/slab.h>
  16 #include <linux/wireless.h>
  17 #include <net/cfg80211.h>
  18 #include <net/iw_handler.h>
  19 #include "core.h"
  20 #include "nl80211.h"
  21 #include "rdev-ops.h"
  22
  23
  24 void cfg80211_rx_assoc_resp(struct net_device *dev, struct cfg80211_bss *bss,
  25                             const u8 *buf, size_t len, int uapsd_queues,
  26                             const u8 *req_ies, size_t req_ies_len)
  27 {
  28         struct wireless_dev *wdev = dev->ieee80211_ptr;
  29         struct wiphy *wiphy = wdev->wiphy;
  30         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  31         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
  32         struct cfg80211_connect_resp_params cr;
  33         const u8 *resp_ie = mgmt->u.assoc_resp.variable;
  34         size_t resp_ie_len = len - offsetof(struct ieee80211_mgmt,
  35                                             u.assoc_resp.variable);
  36
  37         if (bss->channel->band == NL80211_BAND_S1GHZ) {
  38                 resp_ie = (u8 *)&mgmt->u.s1g_assoc_resp.variable;
  39                 resp_ie_len = len - offsetof(struct ieee80211_mgmt,
  40                                              u.s1g_assoc_resp.variable);
  41         }
  42
  43         memset(&cr, 0, sizeof(cr));
  44         cr.status = (int)le16_to_cpu(mgmt->u.assoc_resp.status_code);
  45         cr.bssid = mgmt->bssid;
  46         cr.bss = bss;
  47         cr.req_ie = req_ies;
  48         cr.req_ie_len = req_ies_len;
  49         cr.resp_ie = resp_ie;
  50         cr.resp_ie_len = resp_ie_len;
  51         cr.timeout_reason = NL80211_TIMEOUT_UNSPECIFIED;
  52
  53         trace_cfg80211_send_rx_assoc(dev, bss);
  54
  55         /*
  56          * This is a bit of a hack, we don't notify userspace of
  57          * a (re-)association reply if we tried to send a reassoc
  58          * and got a reject -- we only try again with an assoc
  59          * frame instead of reassoc.
  60          */
  61         if (cfg80211_sme_rx_assoc_resp(wdev, cr.status)) {
  62                 cfg80211_unhold_bss(bss_from_pub(bss));
  63                 cfg80211_put_bss(wiphy, bss);
  64                 return;
  65         }
  66
  67         nl80211_send_rx_assoc(rdev, dev, buf, len, GFP_KERNEL, uapsd_queues,
  68                               req_ies, req_ies_len);
  69         /* update current_bss etc., consumes the bss reference */
  70         __cfg80211_connect_result(dev, &cr, cr.status == WLAN_STATUS_SUCCESS);
  71 }
  72 EXPORT_SYMBOL(cfg80211_rx_assoc_resp);
  73
  74 static void cfg80211_process_auth(struct wireless_dev *wdev,
  75                                   const u8 *buf, size_t len)
  76 {
  77         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
  78
  79         nl80211_send_rx_auth(rdev, wdev->netdev, buf, len, GFP_KERNEL);
  80         cfg80211_sme_rx_auth(wdev, buf, len);
  81 }
  82
  83 static void cfg80211_process_deauth(struct wireless_dev *wdev,
  84                                     const u8 *buf, size_t len,
  85                                     bool reconnect)
  86 {
  87         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
  88         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
  89         const u8 *bssid = mgmt->bssid;
  90         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
  91         bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr);
  92
  93         nl80211_send_deauth(rdev, wdev->netdev, buf, len, reconnect, GFP_KERNEL);
  94
  95         if (!wdev->current_bss ||
  96             !ether_addr_equal(wdev->current_bss->pub.bssid, bssid))
  97                 return;
  98
  99         __cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap);
 100         cfg80211_sme_deauth(wdev);
 101 }
 102
 103 static void cfg80211_process_disassoc(struct wireless_dev *wdev,
 104                                       const u8 *buf, size_t len,
 105                                       bool reconnect)
 106 {
 107         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 108         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 109         const u8 *bssid = mgmt->bssid;
 110         u16 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
 111         bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr);
 112
 113         nl80211_send_disassoc(rdev, wdev->netdev, buf, len, reconnect,
 114                               GFP_KERNEL);
 115
 116         if (WARN_ON(!wdev->current_bss ||
 117                     !ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
 118                 return;
 119
 120         __cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap);
 121         cfg80211_sme_disassoc(wdev);
 122 }
 123
 124 void cfg80211_rx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len)
 125 {
 126         struct wireless_dev *wdev = dev->ieee80211_ptr;
 127         struct ieee80211_mgmt *mgmt = (void *)buf;
 128
 129         ASSERT_WDEV_LOCK(wdev);
 130
 131         trace_cfg80211_rx_mlme_mgmt(dev, buf, len);
 132
 133         if (WARN_ON(len < 2))
 134                 return;
 135
 136         if (ieee80211_is_auth(mgmt->frame_control))
 137                 cfg80211_process_auth(wdev, buf, len);
 138         else if (ieee80211_is_deauth(mgmt->frame_control))
 139                 cfg80211_process_deauth(wdev, buf, len, false);
 140         else if (ieee80211_is_disassoc(mgmt->frame_control))
 141                 cfg80211_process_disassoc(wdev, buf, len, false);
 142 }
 143 EXPORT_SYMBOL(cfg80211_rx_mlme_mgmt);
 144
 145 void cfg80211_auth_timeout(struct net_device *dev, const u8 *addr)
 146 {
 147         struct wireless_dev *wdev = dev->ieee80211_ptr;
 148         struct wiphy *wiphy = wdev->wiphy;
 149         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 150
 151         trace_cfg80211_send_auth_timeout(dev, addr);
 152
 153         nl80211_send_auth_timeout(rdev, dev, addr, GFP_KERNEL);
 154         cfg80211_sme_auth_timeout(wdev);
 155 }
 156 EXPORT_SYMBOL(cfg80211_auth_timeout);
 157
 158 void cfg80211_assoc_timeout(struct net_device *dev, struct cfg80211_bss *bss)
 159 {
 160         struct wireless_dev *wdev = dev->ieee80211_ptr;
 161         struct wiphy *wiphy = wdev->wiphy;
 162         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 163
 164         trace_cfg80211_send_assoc_timeout(dev, bss->bssid);
 165
 166         nl80211_send_assoc_timeout(rdev, dev, bss->bssid, GFP_KERNEL);
 167         cfg80211_sme_assoc_timeout(wdev);
 168
 169         cfg80211_unhold_bss(bss_from_pub(bss));
 170         cfg80211_put_bss(wiphy, bss);
 171 }
 172 EXPORT_SYMBOL(cfg80211_assoc_timeout);
 173
 174 void cfg80211_abandon_assoc(struct net_device *dev, struct cfg80211_bss *bss)
 175 {
 176         struct wireless_dev *wdev = dev->ieee80211_ptr;
 177         struct wiphy *wiphy = wdev->wiphy;
 178
 179         cfg80211_sme_abandon_assoc(wdev);
 180
 181         cfg80211_unhold_bss(bss_from_pub(bss));
 182         cfg80211_put_bss(wiphy, bss);
 183 }
 184 EXPORT_SYMBOL(cfg80211_abandon_assoc);
 185
 186 void cfg80211_tx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len,
 187                            bool reconnect)
 188 {
 189         struct wireless_dev *wdev = dev->ieee80211_ptr;
 190         struct ieee80211_mgmt *mgmt = (void *)buf;
 191
 192         ASSERT_WDEV_LOCK(wdev);
 193
 194         trace_cfg80211_tx_mlme_mgmt(dev, buf, len, reconnect);
 195
 196         if (WARN_ON(len < 2))
 197                 return;
 198
 199         if (ieee80211_is_deauth(mgmt->frame_control))
 200                 cfg80211_process_deauth(wdev, buf, len, reconnect);
 201         else
 202                 cfg80211_process_disassoc(wdev, buf, len, reconnect);
 203 }
 204 EXPORT_SYMBOL(cfg80211_tx_mlme_mgmt);
 205
 206 void cfg80211_michael_mic_failure(struct net_device *dev, const u8 *addr,
 207                                   enum nl80211_key_type key_type, int key_id,
 208                                   const u8 *tsc, gfp_t gfp)
 209 {
 210         struct wiphy *wiphy = dev->ieee80211_ptr->wiphy;
 211         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 212 #ifdef CONFIG_CFG80211_WEXT
 213         union iwreq_data wrqu;
 214         char *buf = kmalloc(128, gfp);
 215
 216         if (buf) {
 217                 sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
 218                         "keyid=%d %scast addr=%pM)", key_id,
 219                         key_type == NL80211_KEYTYPE_GROUP ? "broad" : "uni",
 220                         addr);
 221                 memset(&wrqu, 0, sizeof(wrqu));
 222                 wrqu.data.length = strlen(buf);
 223                 wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
 224                 kfree(buf);
 225         }
 226 #endif
 227
 228         trace_cfg80211_michael_mic_failure(dev, addr, key_type, key_id, tsc);
 229         nl80211_michael_mic_failure(rdev, dev, addr, key_type, key_id, tsc, gfp);
 230 }
 231 EXPORT_SYMBOL(cfg80211_michael_mic_failure);
 232
 233 /* some MLME handling for userspace SME */
 234 int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 235                        struct net_device *dev,
 236                        struct ieee80211_channel *chan,
 237                        enum nl80211_auth_type auth_type,
 238                        const u8 *bssid,
 239                        const u8 *ssid, int ssid_len,
 240                        const u8 *ie, int ie_len,
 241                        const u8 *key, int key_len, int key_idx,
 242                        const u8 *auth_data, int auth_data_len)
 243 {
 244         struct wireless_dev *wdev = dev->ieee80211_ptr;
 245         struct cfg80211_auth_request req = {
 246                 .ie = ie,
 247                 .ie_len = ie_len,
 248                 .auth_data = auth_data,
 249                 .auth_data_len = auth_data_len,
 250                 .auth_type = auth_type,
 251                 .key = key,
 252                 .key_len = key_len,
 253                 .key_idx = key_idx,
 254         };
 255         int err;
 256
 257         ASSERT_WDEV_LOCK(wdev);
 258
 259         if (auth_type == NL80211_AUTHTYPE_SHARED_KEY)
 260                 if (!key || !key_len || key_idx < 0 || key_idx > 3)
 261                         return -EINVAL;
 262
 263         if (wdev->current_bss &&
 264             ether_addr_equal(bssid, wdev->current_bss->pub.bssid))
 265                 return -EALREADY;
 266
 267         req.bss = cfg80211_get_bss(&rdev->wiphy, chan, bssid, ssid, ssid_len,
 268                                    IEEE80211_BSS_TYPE_ESS,
 269                                    IEEE80211_PRIVACY_ANY);
 270         if (!req.bss)
 271                 return -ENOENT;
 272
 273         err = rdev_auth(rdev, dev, &req);
 274
 275         cfg80211_put_bss(&rdev->wiphy, req.bss);
 276         return err;
 277 }
 278
 279 /*  Do a logical ht_capa &= ht_capa_mask.  */
 280 void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa,
 281                                const struct ieee80211_ht_cap *ht_capa_mask)
 282 {
 283         int i;
 284         u8 *p1, *p2;
 285         if (!ht_capa_mask) {
 286                 memset(ht_capa, 0, sizeof(*ht_capa));
 287                 return;
 288         }
 289
 290         p1 = (u8*)(ht_capa);
 291         p2 = (u8*)(ht_capa_mask);
 292         for (i = 0; i < sizeof(*ht_capa); i++)
 293                 p1[i] &= p2[i];
 294 }
 295
 296 /*  Do a logical vht_capa &= vht_capa_mask.  */
 297 void cfg80211_oper_and_vht_capa(struct ieee80211_vht_cap *vht_capa,
 298                                 const struct ieee80211_vht_cap *vht_capa_mask)
 299 {
 300         int i;
 301         u8 *p1, *p2;
 302         if (!vht_capa_mask) {
 303                 memset(vht_capa, 0, sizeof(*vht_capa));
 304                 return;
 305         }
 306
 307         p1 = (u8*)(vht_capa);
 308         p2 = (u8*)(vht_capa_mask);
 309         for (i = 0; i < sizeof(*vht_capa); i++)
 310                 p1[i] &= p2[i];
 311 }
 312
 313 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 314                         struct net_device *dev,
 315                         struct ieee80211_channel *chan,
 316                         const u8 *bssid,
 317                         const u8 *ssid, int ssid_len,
 318                         struct cfg80211_assoc_request *req)
 319 {
 320         struct wireless_dev *wdev = dev->ieee80211_ptr;
 321         int err;
 322
 323         ASSERT_WDEV_LOCK(wdev);
 324
 325         if (wdev->current_bss &&
 326             (!req->prev_bssid || !ether_addr_equal(wdev->current_bss->pub.bssid,
 327                                                    req->prev_bssid)))
 328                 return -EALREADY;
 329
 330         cfg80211_oper_and_ht_capa(&req->ht_capa_mask,
 331                                   rdev->wiphy.ht_capa_mod_mask);
 332         cfg80211_oper_and_vht_capa(&req->vht_capa_mask,
 333                                    rdev->wiphy.vht_capa_mod_mask);
 334
 335         req->bss = cfg80211_get_bss(&rdev->wiphy, chan, bssid, ssid, ssid_len,
 336                                     IEEE80211_BSS_TYPE_ESS,
 337                                     IEEE80211_PRIVACY_ANY);
 338         if (!req->bss)
 339                 return -ENOENT;
 340
 341         err = rdev_assoc(rdev, dev, req);
 342         if (!err)
 343                 cfg80211_hold_bss(bss_from_pub(req->bss));
 344         else
 345                 cfg80211_put_bss(&rdev->wiphy, req->bss);
 346
 347         return err;
 348 }
 349
 350 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 351                          struct net_device *dev, const u8 *bssid,
 352                          const u8 *ie, int ie_len, u16 reason,
 353                          bool local_state_change)
 354 {
 355         struct wireless_dev *wdev = dev->ieee80211_ptr;
 356         struct cfg80211_deauth_request req = {
 357                 .bssid = bssid,
 358                 .reason_code = reason,
 359                 .ie = ie,
 360                 .ie_len = ie_len,
 361                 .local_state_change = local_state_change,
 362         };
 363
 364         ASSERT_WDEV_LOCK(wdev);
 365
 366         if (local_state_change &&
 367             (!wdev->current_bss ||
 368              !ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
 369                 return 0;
 370
 371         if (ether_addr_equal(wdev->disconnect_bssid, bssid) ||
 372             (wdev->current_bss &&
 373              ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
 374                 wdev->conn_owner_nlportid = 0;
 375
 376         return rdev_deauth(rdev, dev, &req);
 377 }
 378
 379 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
 380                            struct net_device *dev, const u8 *bssid,
 381                            const u8 *ie, int ie_len, u16 reason,
 382                            bool local_state_change)
 383 {
 384         struct wireless_dev *wdev = dev->ieee80211_ptr;
 385         struct cfg80211_disassoc_request req = {
 386                 .reason_code = reason,
 387                 .local_state_change = local_state_change,
 388                 .ie = ie,
 389                 .ie_len = ie_len,
 390         };
 391         int err;
 392
 393         ASSERT_WDEV_LOCK(wdev);
 394
 395         if (!wdev->current_bss)
 396                 return -ENOTCONN;
 397
 398         if (ether_addr_equal(wdev->current_bss->pub.bssid, bssid))
 399                 req.bss = &wdev->current_bss->pub;
 400         else
 401                 return -ENOTCONN;
 402
 403         err = rdev_disassoc(rdev, dev, &req);
 404         if (err)
 405                 return err;
 406
 407         /* driver should have reported the disassoc */
 408         WARN_ON(wdev->current_bss);
 409         return 0;
 410 }
 411
 412 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
 413                         struct net_device *dev)
 414 {
 415         struct wireless_dev *wdev = dev->ieee80211_ptr;
 416         u8 bssid[ETH_ALEN];
 417
 418         ASSERT_WDEV_LOCK(wdev);
 419
 420         if (!rdev->ops->deauth)
 421                 return;
 422
 423         if (!wdev->current_bss)
 424                 return;
 425
 426         memcpy(bssid, wdev->current_bss->pub.bssid, ETH_ALEN);
 427         cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
 428                              WLAN_REASON_DEAUTH_LEAVING, false);
 429 }
 430
 431 struct cfg80211_mgmt_registration {
 432         struct list_head list;
 433         struct wireless_dev *wdev;
 434
 435         u32 nlportid;
 436
 437         int match_len;
 438
 439         __le16 frame_type;
 440
 441         bool multicast_rx;
 442
 443         u8 match[];
 444 };
 445
 446 static void cfg80211_mgmt_registrations_update(struct wireless_dev *wdev)
 447 {
 448         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 449         struct wireless_dev *tmp;
 450         struct cfg80211_mgmt_registration *reg;
 451         struct mgmt_frame_regs upd = {};
 452
 453         lockdep_assert_held(&rdev->wiphy.mtx);
 454
 455         spin_lock_bh(&wdev->mgmt_registrations_lock);
 456         if (!wdev->mgmt_registrations_need_update) {
 457                 spin_unlock_bh(&wdev->mgmt_registrations_lock);
 458                 return;
 459         }
 460
 461         rcu_read_lock();
 462         list_for_each_entry_rcu(tmp, &rdev->wiphy.wdev_list, list) {
 463                 list_for_each_entry(reg, &tmp->mgmt_registrations, list) {
 464                         u32 mask = BIT(le16_to_cpu(reg->frame_type) >> 4);
 465                         u32 mcast_mask = 0;
 466
 467                         if (reg->multicast_rx)
 468                                 mcast_mask = mask;
 469
 470                         upd.global_stypes |= mask;
 471                         upd.global_mcast_stypes |= mcast_mask;
 472
 473                         if (tmp == wdev) {
 474                                 upd.interface_stypes |= mask;
 475                                 upd.interface_mcast_stypes |= mcast_mask;
 476                         }
 477                 }
 478         }
 479         rcu_read_unlock();
 480
 481         wdev->mgmt_registrations_need_update = 0;
 482         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 483
 484         rdev_update_mgmt_frame_registrations(rdev, wdev, &upd);
 485 }
 486
 487 void cfg80211_mgmt_registrations_update_wk(struct work_struct *wk)
 488 {
 489         struct cfg80211_registered_device *rdev;
 490         struct wireless_dev *wdev;
 491
 492         rdev = container_of(wk, struct cfg80211_registered_device,
 493                             mgmt_registrations_update_wk);
 494
 495         wiphy_lock(&rdev->wiphy);
 496         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
 497                 cfg80211_mgmt_registrations_update(wdev);
 498         wiphy_unlock(&rdev->wiphy);
 499 }
 500
 501 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_portid,
 502                                 u16 frame_type, const u8 *match_data,
 503                                 int match_len, bool multicast_rx,
 504                                 struct netlink_ext_ack *extack)
 505 {
 506         struct cfg80211_mgmt_registration *reg, *nreg;
 507         int err = 0;
 508         u16 mgmt_type;
 509         bool update_multicast = false;
 510
 511         if (!wdev->wiphy->mgmt_stypes)
 512                 return -EOPNOTSUPP;
 513
 514         if ((frame_type & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT) {
 515                 NL_SET_ERR_MSG(extack, "frame type not management");
 516                 return -EINVAL;
 517         }
 518
 519         if (frame_type & ~(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) {
 520                 NL_SET_ERR_MSG(extack, "Invalid frame type");
 521                 return -EINVAL;
 522         }
 523
 524         mgmt_type = (frame_type & IEEE80211_FCTL_STYPE) >> 4;
 525         if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].rx & BIT(mgmt_type))) {
 526                 NL_SET_ERR_MSG(extack,
 527                                "Registration to specific type not supported");
 528                 return -EINVAL;
 529         }
 530
 531         /*
 532          * To support Pre Association Security Negotiation (PASN), registration
 533          * for authentication frames should be supported. However, as some
 534          * versions of the user space daemons wrongly register to all types of
 535          * authentication frames (which might result in unexpected behavior)
 536          * allow such registration if the request is for a specific
 537          * authentication algorithm number.
 538          */
 539         if (wdev->iftype == NL80211_IFTYPE_STATION &&
 540             (frame_type & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_AUTH &&
 541             !(match_data && match_len >= 2)) {
 542                 NL_SET_ERR_MSG(extack,
 543                                "Authentication algorithm number required");
 544                 return -EINVAL;
 545         }
 546
 547         nreg = kzalloc(sizeof(*reg) + match_len, GFP_KERNEL);
 548         if (!nreg)
 549                 return -ENOMEM;
 550
 551         spin_lock_bh(&wdev->mgmt_registrations_lock);
 552
 553         list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
 554                 int mlen = min(match_len, reg->match_len);
 555
 556                 if (frame_type != le16_to_cpu(reg->frame_type))
 557                         continue;
 558
 559                 if (memcmp(reg->match, match_data, mlen) == 0) {
 560                         if (reg->multicast_rx != multicast_rx) {
 561                                 update_multicast = true;
 562                                 reg->multicast_rx = multicast_rx;
 563                                 break;
 564                         }
 565                         NL_SET_ERR_MSG(extack, "Match already configured");
 566                         err = -EALREADY;
 567                         break;
 568                 }
 569         }
 570
 571         if (err)
 572                 goto out;
 573
 574         if (update_multicast) {
 575                 kfree(nreg);
 576         } else {
 577                 memcpy(nreg->match, match_data, match_len);
 578                 nreg->match_len = match_len;
 579                 nreg->nlportid = snd_portid;
 580                 nreg->frame_type = cpu_to_le16(frame_type);
 581                 nreg->wdev = wdev;
 582                 nreg->multicast_rx = multicast_rx;
 583                 list_add(&nreg->list, &wdev->mgmt_registrations);
 584         }
 585         wdev->mgmt_registrations_need_update = 1;
 586         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 587
 588         cfg80211_mgmt_registrations_update(wdev);
 589
 590         return 0;
 591
 592  out:
 593         kfree(nreg);
 594         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 595
 596         return err;
 597 }
 598
 599 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlportid)
 600 {
 601         struct wiphy *wiphy = wdev->wiphy;
 602         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 603         struct cfg80211_mgmt_registration *reg, *tmp;
 604
 605         spin_lock_bh(&wdev->mgmt_registrations_lock);
 606
 607         list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
 608                 if (reg->nlportid != nlportid)
 609                         continue;
 610
 611                 list_del(&reg->list);
 612                 kfree(reg);
 613
 614                 wdev->mgmt_registrations_need_update = 1;
 615                 schedule_work(&rdev->mgmt_registrations_update_wk);
 616         }
 617
 618         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 619
 620         if (nlportid && rdev->crit_proto_nlportid == nlportid) {
 621                 rdev->crit_proto_nlportid = 0;
 622                 rdev_crit_proto_stop(rdev, wdev);
 623         }
 624
 625         if (nlportid == wdev->ap_unexpected_nlportid)
 626                 wdev->ap_unexpected_nlportid = 0;
 627 }
 628
 629 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev)
 630 {
 631         struct cfg80211_mgmt_registration *reg, *tmp;
 632
 633         spin_lock_bh(&wdev->mgmt_registrations_lock);
 634         list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
 635                 list_del(&reg->list);
 636                 kfree(reg);
 637         }
 638         wdev->mgmt_registrations_need_update = 1;
 639         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 640
 641         cfg80211_mgmt_registrations_update(wdev);
 642 }
 643
 644 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
 645                           struct wireless_dev *wdev,
 646                           struct cfg80211_mgmt_tx_params *params, u64 *cookie)
 647 {
 648         const struct ieee80211_mgmt *mgmt;
 649         u16 stype;
 650
 651         if (!wdev->wiphy->mgmt_stypes)
 652                 return -EOPNOTSUPP;
 653
 654         if (!rdev->ops->mgmt_tx)
 655                 return -EOPNOTSUPP;
 656
 657         if (params->len < 24 + 1)
 658                 return -EINVAL;
 659
 660         mgmt = (const struct ieee80211_mgmt *)params->buf;
 661
 662         if (!ieee80211_is_mgmt(mgmt->frame_control))
 663                 return -EINVAL;
 664
 665         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 666         if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].tx & BIT(stype >> 4)))
 667                 return -EINVAL;
 668
 669         if (ieee80211_is_action(mgmt->frame_control) &&
 670             mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) {
 671                 int err = 0;
 672
 673                 wdev_lock(wdev);
 674
 675                 switch (wdev->iftype) {
 676                 case NL80211_IFTYPE_ADHOC:
 677                 case NL80211_IFTYPE_STATION:
 678                 case NL80211_IFTYPE_P2P_CLIENT:
 679                         if (!wdev->current_bss) {
 680                                 err = -ENOTCONN;
 681                                 break;
 682                         }
 683
 684                         if (!ether_addr_equal(wdev->current_bss->pub.bssid,
 685                                               mgmt->bssid)) {
 686                                 err = -ENOTCONN;
 687                                 break;
 688                         }
 689
 690                         /*
 691                          * check for IBSS DA must be done by driver as
 692                          * cfg80211 doesn't track the stations
 693                          */
 694                         if (wdev->iftype == NL80211_IFTYPE_ADHOC)
 695                                 break;
 696
 697                         /* for station, check that DA is the AP */
 698                         if (!ether_addr_equal(wdev->current_bss->pub.bssid,
 699                                               mgmt->da)) {
 700                                 err = -ENOTCONN;
 701                                 break;
 702                         }
 703                         break;
 704                 case NL80211_IFTYPE_AP:
 705                 case NL80211_IFTYPE_P2P_GO:
 706                 case NL80211_IFTYPE_AP_VLAN:
 707                         if (!ether_addr_equal(mgmt->bssid, wdev_address(wdev)))
 708                                 err = -EINVAL;
 709                         break;
 710                 case NL80211_IFTYPE_MESH_POINT:
 711                         if (!ether_addr_equal(mgmt->sa, mgmt->bssid)) {
 712                                 err = -EINVAL;
 713                                 break;
 714                         }
 715                         /*
 716                          * check for mesh DA must be done by driver as
 717                          * cfg80211 doesn't track the stations
 718                          */
 719                         break;
 720                 case NL80211_IFTYPE_P2P_DEVICE:
 721                         /*
 722                          * fall through, P2P device only supports
 723                          * public action frames
 724                          */
 725                 case NL80211_IFTYPE_NAN:
 726                 default:
 727                         err = -EOPNOTSUPP;
 728                         break;
 729                 }
 730                 wdev_unlock(wdev);
 731
 732                 if (err)
 733                         return err;
 734         }
 735
 736         if (!ether_addr_equal(mgmt->sa, wdev_address(wdev))) {
 737                 /* Allow random TA to be used with Public Action frames if the
 738                  * driver has indicated support for this. Otherwise, only allow
 739                  * the local address to be used.
 740                  */
 741                 if (!ieee80211_is_action(mgmt->frame_control) ||
 742                     mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
 743                         return -EINVAL;
 744                 if (!wdev->current_bss &&
 745                     !wiphy_ext_feature_isset(
 746                             &rdev->wiphy,
 747                             NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA))
 748                         return -EINVAL;
 749                 if (wdev->current_bss &&
 750                     !wiphy_ext_feature_isset(
 751                             &rdev->wiphy,
 752                             NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA_CONNECTED))
 753                         return -EINVAL;
 754         }
 755
 756         /* Transmit the Action frame as requested by user space */
 757         return rdev_mgmt_tx(rdev, wdev, params, cookie);
 758 }
 759
 760 bool cfg80211_rx_mgmt_khz(struct wireless_dev *wdev, int freq, int sig_dbm,
 761                           const u8 *buf, size_t len, u32 flags)
 762 {
 763         struct wiphy *wiphy = wdev->wiphy;
 764         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 765         struct cfg80211_mgmt_registration *reg;
 766         const struct ieee80211_txrx_stypes *stypes =
 767                 &wiphy->mgmt_stypes[wdev->iftype];
 768         struct ieee80211_mgmt *mgmt = (void *)buf;
 769         const u8 *data;
 770         int data_len;
 771         bool result = false;
 772         __le16 ftype = mgmt->frame_control &
 773                 cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE);
 774         u16 stype;
 775
 776         trace_cfg80211_rx_mgmt(wdev, freq, sig_dbm);
 777         stype = (le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE) >> 4;
 778
 779         if (!(stypes->rx & BIT(stype))) {
 780                 trace_cfg80211_return_bool(false);
 781                 return false;
 782         }
 783
 784         data = buf + ieee80211_hdrlen(mgmt->frame_control);
 785         data_len = len - ieee80211_hdrlen(mgmt->frame_control);
 786
 787         spin_lock_bh(&wdev->mgmt_registrations_lock);
 788
 789         list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
 790                 if (reg->frame_type != ftype)
 791                         continue;
 792
 793                 if (reg->match_len > data_len)
 794                         continue;
 795
 796                 if (memcmp(reg->match, data, reg->match_len))
 797                         continue;
 798
 799                 /* found match! */
 800
 801                 /* Indicate the received Action frame to user space */
 802                 if (nl80211_send_mgmt(rdev, wdev, reg->nlportid,
 803                                       freq, sig_dbm,
 804                                       buf, len, flags, GFP_ATOMIC))
 805                         continue;
 806
 807                 result = true;
 808                 break;
 809         }
 810
 811         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 812
 813         trace_cfg80211_return_bool(result);
 814         return result;
 815 }
 816 EXPORT_SYMBOL(cfg80211_rx_mgmt_khz);
 817
 818 void cfg80211_sched_dfs_chan_update(struct cfg80211_registered_device *rdev)
 819 {
 820         cancel_delayed_work(&rdev->dfs_update_channels_wk);
 821         queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk, 0);
 822 }
 823
 824 void cfg80211_dfs_channels_update_work(struct work_struct *work)
 825 {
 826         struct delayed_work *delayed_work = to_delayed_work(work);
 827         struct cfg80211_registered_device *rdev;
 828         struct cfg80211_chan_def chandef;
 829         struct ieee80211_supported_band *sband;
 830         struct ieee80211_channel *c;
 831         struct wiphy *wiphy;
 832         bool check_again = false;
 833         unsigned long timeout, next_time = 0;
 834         unsigned long time_dfs_update;
 835         enum nl80211_radar_event radar_event;
 836         int bandid, i;
 837
 838         rdev = container_of(delayed_work, struct cfg80211_registered_device,
 839                             dfs_update_channels_wk);
 840         wiphy = &rdev->wiphy;
 841
 842         rtnl_lock();
 843         for (bandid = 0; bandid < NUM_NL80211_BANDS; bandid++) {
 844                 sband = wiphy->bands[bandid];
 845                 if (!sband)
 846                         continue;
 847
 848                 for (i = 0; i < sband->n_channels; i++) {
 849                         c = &sband->channels[i];
 850
 851                         if (!(c->flags & IEEE80211_CHAN_RADAR))
 852                                 continue;
 853
 854                         if (c->dfs_state != NL80211_DFS_UNAVAILABLE &&
 855                             c->dfs_state != NL80211_DFS_AVAILABLE)
 856                                 continue;
 857
 858                         if (c->dfs_state == NL80211_DFS_UNAVAILABLE) {
 859                                 time_dfs_update = IEEE80211_DFS_MIN_NOP_TIME_MS;
 860                                 radar_event = NL80211_RADAR_NOP_FINISHED;
 861                         } else {
 862                                 if (regulatory_pre_cac_allowed(wiphy) ||
 863                                     cfg80211_any_wiphy_oper_chan(wiphy, c))
 864                                         continue;
 865
 866                                 time_dfs_update = REG_PRE_CAC_EXPIRY_GRACE_MS;
 867                                 radar_event = NL80211_RADAR_PRE_CAC_EXPIRED;
 868                         }
 869
 870                         timeout = c->dfs_state_entered +
 871                                   msecs_to_jiffies(time_dfs_update);
 872
 873                         if (time_after_eq(jiffies, timeout)) {
 874                                 c->dfs_state = NL80211_DFS_USABLE;
 875                                 c->dfs_state_entered = jiffies;
 876
 877                                 cfg80211_chandef_create(&chandef, c,
 878                                                         NL80211_CHAN_NO_HT);
 879
 880                                 nl80211_radar_notify(rdev, &chandef,
 881                                                      radar_event, NULL,
 882                                                      GFP_ATOMIC);
 883
 884                                 regulatory_propagate_dfs_state(wiphy, &chandef,
 885                                                                c->dfs_state,
 886                                                                radar_event);
 887                                 continue;
 888                         }
 889
 890                         if (!check_again)
 891                                 next_time = timeout - jiffies;
 892                         else
 893                                 next_time = min(next_time, timeout - jiffies);
 894                         check_again = true;
 895                 }
 896         }
 897         rtnl_unlock();
 898
 899         /* reschedule if there are other channels waiting to be cleared again */
 900         if (check_again)
 901                 queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
 902                                    next_time);
 903 }
 904
 905
 906 void cfg80211_radar_event(struct wiphy *wiphy,
 907                           struct cfg80211_chan_def *chandef,
 908                           gfp_t gfp)
 909 {
 910         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 911
 912         trace_cfg80211_radar_event(wiphy, chandef);
 913
 914         /* only set the chandef supplied channel to unavailable, in
 915          * case the radar is detected on only one of multiple channels
 916          * spanned by the chandef.
 917          */
 918         cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_UNAVAILABLE);
 919
 920         cfg80211_sched_dfs_chan_update(rdev);
 921
 922         nl80211_radar_notify(rdev, chandef, NL80211_RADAR_DETECTED, NULL, gfp);
 923
 924         memcpy(&rdev->radar_chandef, chandef, sizeof(struct cfg80211_chan_def));
 925         queue_work(cfg80211_wq, &rdev->propagate_radar_detect_wk);
 926 }
 927 EXPORT_SYMBOL(cfg80211_radar_event);
 928
 929 void cfg80211_cac_event(struct net_device *netdev,
 930                         const struct cfg80211_chan_def *chandef,
 931                         enum nl80211_radar_event event, gfp_t gfp)
 932 {
 933         struct wireless_dev *wdev = netdev->ieee80211_ptr;
 934         struct wiphy *wiphy = wdev->wiphy;
 935         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 936         unsigned long timeout;
 937
 938         trace_cfg80211_cac_event(netdev, event);
 939
 940         if (WARN_ON(!wdev->cac_started && event != NL80211_RADAR_CAC_STARTED))
 941                 return;
 942
 943         if (WARN_ON(!wdev->chandef.chan))
 944                 return;
 945
 946         switch (event) {
 947         case NL80211_RADAR_CAC_FINISHED:
 948                 timeout = wdev->cac_start_time +
 949                           msecs_to_jiffies(wdev->cac_time_ms);
 950                 WARN_ON(!time_after_eq(jiffies, timeout));
 951                 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
 952                 memcpy(&rdev->cac_done_chandef, chandef,
 953                        sizeof(struct cfg80211_chan_def));
 954                 queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk);
 955                 cfg80211_sched_dfs_chan_update(rdev);
 956                 fallthrough;
 957         case NL80211_RADAR_CAC_ABORTED:
 958                 wdev->cac_started = false;
 959                 break;
 960         case NL80211_RADAR_CAC_STARTED:
 961                 wdev->cac_started = true;
 962                 break;
 963         default:
 964                 WARN_ON(1);
 965                 return;
 966         }
 967
 968         nl80211_radar_notify(rdev, chandef, event, netdev, gfp);
 969 }
 970 EXPORT_SYMBOL(cfg80211_cac_event);