net/wireless/mlme.c

   1 /*
   2  * cfg80211 MLME SAP interface
   3  *
   4  * Copyright (c) 2009, Jouni Malinen <j@w1.fi>
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/module.h>
   9 #include <linux/etherdevice.h>
  10 #include <linux/netdevice.h>
  11 #include <linux/nl80211.h>
  12 #include <linux/slab.h>
  13 #include <linux/wireless.h>
  14 #include <net/cfg80211.h>
  15 #include <net/iw_handler.h>
  16 #include "core.h"
  17 #include "nl80211.h"
  18 #include "rdev-ops.h"
  19
  20
  21 void cfg80211_send_rx_auth(struct net_device *dev, const u8 *buf, size_t len)
  22 {
  23         struct wireless_dev *wdev = dev->ieee80211_ptr;
  24         struct wiphy *wiphy = wdev->wiphy;
  25         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
  26
  27         trace_cfg80211_send_rx_auth(dev);
  28         wdev_lock(wdev);
  29
  30         nl80211_send_rx_auth(rdev, dev, buf, len, GFP_KERNEL);
  31         cfg80211_sme_rx_auth(dev, buf, len);
  32
  33         wdev_unlock(wdev);
  34 }
  35 EXPORT_SYMBOL(cfg80211_send_rx_auth);
  36
  37 void cfg80211_send_rx_assoc(struct net_device *dev, struct cfg80211_bss *bss,
  38                             const u8 *buf, size_t len)
  39 {
  40         u16 status_code;
  41         struct wireless_dev *wdev = dev->ieee80211_ptr;
  42         struct wiphy *wiphy = wdev->wiphy;
  43         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
  44         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
  45         u8 *ie = mgmt->u.assoc_resp.variable;
  46         int ieoffs = offsetof(struct ieee80211_mgmt, u.assoc_resp.variable);
  47
  48         trace_cfg80211_send_rx_assoc(dev, bss);
  49         wdev_lock(wdev);
  50
  51         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
  52
  53         /*
  54          * This is a bit of a hack, we don't notify userspace of
  55          * a (re-)association reply if we tried to send a reassoc
  56          * and got a reject -- we only try again with an assoc
  57          * frame instead of reassoc.
  58          */
  59         if (status_code != WLAN_STATUS_SUCCESS && wdev->conn &&
  60             cfg80211_sme_failed_reassoc(wdev)) {
  61                 cfg80211_put_bss(wiphy, bss);
  62                 goto out;
  63         }
  64
  65         nl80211_send_rx_assoc(rdev, dev, buf, len, GFP_KERNEL);
  66
  67         if (status_code != WLAN_STATUS_SUCCESS && wdev->conn) {
  68                 cfg80211_sme_failed_assoc(wdev);
  69                 /*
  70                  * do not call connect_result() now because the
  71                  * sme will schedule work that does it later.
  72                  */
  73                 cfg80211_put_bss(wiphy, bss);
  74                 goto out;
  75         }
  76
  77         if (!wdev->conn && wdev->sme_state == CFG80211_SME_IDLE) {
  78                 /*
  79                  * This is for the userspace SME, the CONNECTING
  80                  * state will be changed to CONNECTED by
  81                  * __cfg80211_connect_result() below.
  82                  */
  83                 wdev->sme_state = CFG80211_SME_CONNECTING;
  84         }
  85
  86         /* this consumes the bss reference */
  87         __cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, ie, len - ieoffs,
  88                                   status_code,
  89                                   status_code == WLAN_STATUS_SUCCESS, bss);
  90  out:
  91         wdev_unlock(wdev);
  92 }
  93 EXPORT_SYMBOL(cfg80211_send_rx_assoc);
  94
  95 void __cfg80211_send_deauth(struct net_device *dev,
  96                                    const u8 *buf, size_t len)
  97 {
  98         struct wireless_dev *wdev = dev->ieee80211_ptr;
  99         struct wiphy *wiphy = wdev->wiphy;
 100         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 101         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 102         const u8 *bssid = mgmt->bssid;
 103         bool was_current = false;
 104
 105         trace___cfg80211_send_deauth(dev);
 106         ASSERT_WDEV_LOCK(wdev);
 107
 108         if (wdev->current_bss &&
 109             ether_addr_equal(wdev->current_bss->pub.bssid, bssid)) {
 110                 cfg80211_unhold_bss(wdev->current_bss);
 111                 cfg80211_put_bss(wiphy, &wdev->current_bss->pub);
 112                 wdev->current_bss = NULL;
 113                 was_current = true;
 114         }
 115
 116         nl80211_send_deauth(rdev, dev, buf, len, GFP_KERNEL);
 117
 118         if (wdev->sme_state == CFG80211_SME_CONNECTED && was_current) {
 119                 u16 reason_code;
 120                 bool from_ap;
 121
 122                 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
 123
 124                 from_ap = !ether_addr_equal(mgmt->sa, dev->dev_addr);
 125                 __cfg80211_disconnected(dev, NULL, 0, reason_code, from_ap);
 126         } else if (wdev->sme_state == CFG80211_SME_CONNECTING) {
 127                 __cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, NULL, 0,
 128                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
 129                                           false, NULL);
 130         }
 131 }
 132 EXPORT_SYMBOL(__cfg80211_send_deauth);
 133
 134 void cfg80211_send_deauth(struct net_device *dev, const u8 *buf, size_t len)
 135 {
 136         struct wireless_dev *wdev = dev->ieee80211_ptr;
 137
 138         wdev_lock(wdev);
 139         __cfg80211_send_deauth(dev, buf, len);
 140         wdev_unlock(wdev);
 141 }
 142 EXPORT_SYMBOL(cfg80211_send_deauth);
 143
 144 void __cfg80211_send_disassoc(struct net_device *dev,
 145                                      const u8 *buf, size_t len)
 146 {
 147         struct wireless_dev *wdev = dev->ieee80211_ptr;
 148         struct wiphy *wiphy = wdev->wiphy;
 149         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 150         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 151         const u8 *bssid = mgmt->bssid;
 152         u16 reason_code;
 153         bool from_ap;
 154
 155         trace___cfg80211_send_disassoc(dev);
 156         ASSERT_WDEV_LOCK(wdev);
 157
 158         nl80211_send_disassoc(rdev, dev, buf, len, GFP_KERNEL);
 159
 160         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 161                 return;
 162
 163         if (wdev->current_bss &&
 164             ether_addr_equal(wdev->current_bss->pub.bssid, bssid)) {
 165                 cfg80211_sme_disassoc(dev, wdev->current_bss);
 166                 cfg80211_unhold_bss(wdev->current_bss);
 167                 cfg80211_put_bss(wiphy, &wdev->current_bss->pub);
 168                 wdev->current_bss = NULL;
 169         } else
 170                 WARN_ON(1);
 171
 172
 173         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
 174
 175         from_ap = !ether_addr_equal(mgmt->sa, dev->dev_addr);
 176         __cfg80211_disconnected(dev, NULL, 0, reason_code, from_ap);
 177 }
 178 EXPORT_SYMBOL(__cfg80211_send_disassoc);
 179
 180 void cfg80211_send_disassoc(struct net_device *dev, const u8 *buf, size_t len)
 181 {
 182         struct wireless_dev *wdev = dev->ieee80211_ptr;
 183
 184         wdev_lock(wdev);
 185         __cfg80211_send_disassoc(dev, buf, len);
 186         wdev_unlock(wdev);
 187 }
 188 EXPORT_SYMBOL(cfg80211_send_disassoc);
 189
 190 void cfg80211_send_auth_timeout(struct net_device *dev, const u8 *addr)
 191 {
 192         struct wireless_dev *wdev = dev->ieee80211_ptr;
 193         struct wiphy *wiphy = wdev->wiphy;
 194         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 195
 196         trace_cfg80211_send_auth_timeout(dev, addr);
 197         wdev_lock(wdev);
 198
 199         nl80211_send_auth_timeout(rdev, dev, addr, GFP_KERNEL);
 200         if (wdev->sme_state == CFG80211_SME_CONNECTING)
 201                 __cfg80211_connect_result(dev, addr, NULL, 0, NULL, 0,
 202                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
 203                                           false, NULL);
 204
 205         wdev_unlock(wdev);
 206 }
 207 EXPORT_SYMBOL(cfg80211_send_auth_timeout);
 208
 209 void cfg80211_send_assoc_timeout(struct net_device *dev, const u8 *addr)
 210 {
 211         struct wireless_dev *wdev = dev->ieee80211_ptr;
 212         struct wiphy *wiphy = wdev->wiphy;
 213         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 214
 215         trace_cfg80211_send_assoc_timeout(dev, addr);
 216         wdev_lock(wdev);
 217
 218         nl80211_send_assoc_timeout(rdev, dev, addr, GFP_KERNEL);
 219         if (wdev->sme_state == CFG80211_SME_CONNECTING)
 220                 __cfg80211_connect_result(dev, addr, NULL, 0, NULL, 0,
 221                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
 222                                           false, NULL);
 223
 224         wdev_unlock(wdev);
 225 }
 226 EXPORT_SYMBOL(cfg80211_send_assoc_timeout);
 227
 228 void cfg80211_michael_mic_failure(struct net_device *dev, const u8 *addr,
 229                                   enum nl80211_key_type key_type, int key_id,
 230                                   const u8 *tsc, gfp_t gfp)
 231 {
 232         struct wiphy *wiphy = dev->ieee80211_ptr->wiphy;
 233         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 234 #ifdef CONFIG_CFG80211_WEXT
 235         union iwreq_data wrqu;
 236         char *buf = kmalloc(128, gfp);
 237
 238         if (buf) {
 239                 sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
 240                         "keyid=%d %scast addr=%pM)", key_id,
 241                         key_type == NL80211_KEYTYPE_GROUP ? "broad" : "uni",
 242                         addr);
 243                 memset(&wrqu, 0, sizeof(wrqu));
 244                 wrqu.data.length = strlen(buf);
 245                 wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
 246                 kfree(buf);
 247         }
 248 #endif
 249
 250         trace_cfg80211_michael_mic_failure(dev, addr, key_type, key_id, tsc);
 251         nl80211_michael_mic_failure(rdev, dev, addr, key_type, key_id, tsc, gfp);
 252 }
 253 EXPORT_SYMBOL(cfg80211_michael_mic_failure);
 254
 255 /* some MLME handling for userspace SME */
 256 int __cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 257                          struct net_device *dev,
 258                          struct ieee80211_channel *chan,
 259                          enum nl80211_auth_type auth_type,
 260                          const u8 *bssid,
 261                          const u8 *ssid, int ssid_len,
 262                          const u8 *ie, int ie_len,
 263                          const u8 *key, int key_len, int key_idx,
 264                          const u8 *sae_data, int sae_data_len)
 265 {
 266         struct wireless_dev *wdev = dev->ieee80211_ptr;
 267         struct cfg80211_auth_request req;
 268         int err;
 269
 270         ASSERT_WDEV_LOCK(wdev);
 271
 272         if (auth_type == NL80211_AUTHTYPE_SHARED_KEY)
 273                 if (!key || !key_len || key_idx < 0 || key_idx > 4)
 274                         return -EINVAL;
 275
 276         if (wdev->current_bss &&
 277             ether_addr_equal(bssid, wdev->current_bss->pub.bssid))
 278                 return -EALREADY;
 279
 280         memset(&req, 0, sizeof(req));
 281
 282         req.ie = ie;
 283         req.ie_len = ie_len;
 284         req.sae_data = sae_data;
 285         req.sae_data_len = sae_data_len;
 286         req.auth_type = auth_type;
 287         req.bss = cfg80211_get_bss(&rdev->wiphy, chan, bssid, ssid, ssid_len,
 288                                    WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
 289         req.key = key;
 290         req.key_len = key_len;
 291         req.key_idx = key_idx;
 292         if (!req.bss)
 293                 return -ENOENT;
 294
 295         err = cfg80211_can_use_chan(rdev, wdev, req.bss->channel,
 296                                     CHAN_MODE_SHARED);
 297         if (err)
 298                 goto out;
 299
 300         err = rdev_auth(rdev, dev, &req);
 301
 302 out:
 303         cfg80211_put_bss(&rdev->wiphy, req.bss);
 304         return err;
 305 }
 306
 307 int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 308                        struct net_device *dev, struct ieee80211_channel *chan,
 309                        enum nl80211_auth_type auth_type, const u8 *bssid,
 310                        const u8 *ssid, int ssid_len,
 311                        const u8 *ie, int ie_len,
 312                        const u8 *key, int key_len, int key_idx,
 313                        const u8 *sae_data, int sae_data_len)
 314 {
 315         int err;
 316
 317         mutex_lock(&rdev->devlist_mtx);
 318         wdev_lock(dev->ieee80211_ptr);
 319         err = __cfg80211_mlme_auth(rdev, dev, chan, auth_type, bssid,
 320                                    ssid, ssid_len, ie, ie_len,
 321                                    key, key_len, key_idx,
 322                                    sae_data, sae_data_len);
 323         wdev_unlock(dev->ieee80211_ptr);
 324         mutex_unlock(&rdev->devlist_mtx);
 325
 326         return err;
 327 }
 328
 329 /*  Do a logical ht_capa &= ht_capa_mask.  */
 330 void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa,
 331                                const struct ieee80211_ht_cap *ht_capa_mask)
 332 {
 333         int i;
 334         u8 *p1, *p2;
 335         if (!ht_capa_mask) {
 336                 memset(ht_capa, 0, sizeof(*ht_capa));
 337                 return;
 338         }
 339
 340         p1 = (u8*)(ht_capa);
 341         p2 = (u8*)(ht_capa_mask);
 342         for (i = 0; i<sizeof(*ht_capa); i++)
 343                 p1[i] &= p2[i];
 344 }
 345
 346 /*  Do a logical ht_capa &= ht_capa_mask.  */
 347 void cfg80211_oper_and_vht_capa(struct ieee80211_vht_cap *vht_capa,
 348                                 const struct ieee80211_vht_cap *vht_capa_mask)
 349 {
 350         int i;
 351         u8 *p1, *p2;
 352         if (!vht_capa_mask) {
 353                 memset(vht_capa, 0, sizeof(*vht_capa));
 354                 return;
 355         }
 356
 357         p1 = (u8*)(vht_capa);
 358         p2 = (u8*)(vht_capa_mask);
 359         for (i = 0; i < sizeof(*vht_capa); i++)
 360                 p1[i] &= p2[i];
 361 }
 362
 363 int __cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 364                           struct net_device *dev,
 365                           struct ieee80211_channel *chan,
 366                           const u8 *bssid,
 367                           const u8 *ssid, int ssid_len,
 368                           struct cfg80211_assoc_request *req)
 369 {
 370         struct wireless_dev *wdev = dev->ieee80211_ptr;
 371         int err;
 372         bool was_connected = false;
 373
 374         ASSERT_WDEV_LOCK(wdev);
 375
 376         if (wdev->current_bss && req->prev_bssid &&
 377             ether_addr_equal(wdev->current_bss->pub.bssid, req->prev_bssid)) {
 378                 /*
 379                  * Trying to reassociate: Allow this to proceed and let the old
 380                  * association to be dropped when the new one is completed.
 381                  */
 382                 if (wdev->sme_state == CFG80211_SME_CONNECTED) {
 383                         was_connected = true;
 384                         wdev->sme_state = CFG80211_SME_CONNECTING;
 385                 }
 386         } else if (wdev->current_bss)
 387                 return -EALREADY;
 388
 389         cfg80211_oper_and_ht_capa(&req->ht_capa_mask,
 390                                   rdev->wiphy.ht_capa_mod_mask);
 391         cfg80211_oper_and_vht_capa(&req->vht_capa_mask,
 392                                    rdev->wiphy.vht_capa_mod_mask);
 393
 394         req->bss = cfg80211_get_bss(&rdev->wiphy, chan, bssid, ssid, ssid_len,
 395                                     WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
 396         if (!req->bss) {
 397                 if (was_connected)
 398                         wdev->sme_state = CFG80211_SME_CONNECTED;
 399                 return -ENOENT;
 400         }
 401
 402         err = cfg80211_can_use_chan(rdev, wdev, chan, CHAN_MODE_SHARED);
 403         if (err)
 404                 goto out;
 405
 406         err = rdev_assoc(rdev, dev, req);
 407
 408 out:
 409         if (err) {
 410                 if (was_connected)
 411                         wdev->sme_state = CFG80211_SME_CONNECTED;
 412                 cfg80211_put_bss(&rdev->wiphy, req->bss);
 413         }
 414
 415         return err;
 416 }
 417
 418 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 419                         struct net_device *dev,
 420                         struct ieee80211_channel *chan,
 421                         const u8 *bssid,
 422                         const u8 *ssid, int ssid_len,
 423                         struct cfg80211_assoc_request *req)
 424 {
 425         struct wireless_dev *wdev = dev->ieee80211_ptr;
 426         int err;
 427
 428         mutex_lock(&rdev->devlist_mtx);
 429         wdev_lock(wdev);
 430         err = __cfg80211_mlme_assoc(rdev, dev, chan, bssid,
 431                                     ssid, ssid_len, req);
 432         wdev_unlock(wdev);
 433         mutex_unlock(&rdev->devlist_mtx);
 434
 435         return err;
 436 }
 437
 438 int __cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 439                            struct net_device *dev, const u8 *bssid,
 440                            const u8 *ie, int ie_len, u16 reason,
 441                            bool local_state_change)
 442 {
 443         struct wireless_dev *wdev = dev->ieee80211_ptr;
 444         struct cfg80211_deauth_request req = {
 445                 .bssid = bssid,
 446                 .reason_code = reason,
 447                 .ie = ie,
 448                 .ie_len = ie_len,
 449                 .local_state_change = local_state_change,
 450         };
 451
 452         ASSERT_WDEV_LOCK(wdev);
 453
 454         if (local_state_change && (!wdev->current_bss ||
 455             !ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
 456                 return 0;
 457
 458         return rdev_deauth(rdev, dev, &req);
 459 }
 460
 461 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 462                          struct net_device *dev, const u8 *bssid,
 463                          const u8 *ie, int ie_len, u16 reason,
 464                          bool local_state_change)
 465 {
 466         struct wireless_dev *wdev = dev->ieee80211_ptr;
 467         int err;
 468
 469         wdev_lock(wdev);
 470         err = __cfg80211_mlme_deauth(rdev, dev, bssid, ie, ie_len, reason,
 471                                      local_state_change);
 472         wdev_unlock(wdev);
 473
 474         return err;
 475 }
 476
 477 static int __cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
 478                                     struct net_device *dev, const u8 *bssid,
 479                                     const u8 *ie, int ie_len, u16 reason,
 480                                     bool local_state_change)
 481 {
 482         struct wireless_dev *wdev = dev->ieee80211_ptr;
 483         struct cfg80211_disassoc_request req;
 484
 485         ASSERT_WDEV_LOCK(wdev);
 486
 487         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 488                 return -ENOTCONN;
 489
 490         if (WARN(!wdev->current_bss, "sme_state=%d\n", wdev->sme_state))
 491                 return -ENOTCONN;
 492
 493         memset(&req, 0, sizeof(req));
 494         req.reason_code = reason;
 495         req.local_state_change = local_state_change;
 496         req.ie = ie;
 497         req.ie_len = ie_len;
 498         if (ether_addr_equal(wdev->current_bss->pub.bssid, bssid))
 499                 req.bss = &wdev->current_bss->pub;
 500         else
 501                 return -ENOTCONN;
 502
 503         return rdev_disassoc(rdev, dev, &req);
 504 }
 505
 506 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
 507                            struct net_device *dev, const u8 *bssid,
 508                            const u8 *ie, int ie_len, u16 reason,
 509                            bool local_state_change)
 510 {
 511         struct wireless_dev *wdev = dev->ieee80211_ptr;
 512         int err;
 513
 514         wdev_lock(wdev);
 515         err = __cfg80211_mlme_disassoc(rdev, dev, bssid, ie, ie_len, reason,
 516                                        local_state_change);
 517         wdev_unlock(wdev);
 518
 519         return err;
 520 }
 521
 522 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
 523                         struct net_device *dev)
 524 {
 525         struct wireless_dev *wdev = dev->ieee80211_ptr;
 526         struct cfg80211_deauth_request req;
 527         u8 bssid[ETH_ALEN];
 528
 529         ASSERT_WDEV_LOCK(wdev);
 530
 531         if (!rdev->ops->deauth)
 532                 return;
 533
 534         memset(&req, 0, sizeof(req));
 535         req.reason_code = WLAN_REASON_DEAUTH_LEAVING;
 536         req.ie = NULL;
 537         req.ie_len = 0;
 538
 539         if (!wdev->current_bss)
 540                 return;
 541
 542         memcpy(bssid, wdev->current_bss->pub.bssid, ETH_ALEN);
 543         req.bssid = bssid;
 544         rdev_deauth(rdev, dev, &req);
 545
 546         if (wdev->current_bss) {
 547                 cfg80211_unhold_bss(wdev->current_bss);
 548                 cfg80211_put_bss(&rdev->wiphy, &wdev->current_bss->pub);
 549                 wdev->current_bss = NULL;
 550         }
 551 }
 552
 553 struct cfg80211_mgmt_registration {
 554         struct list_head list;
 555
 556         u32 nlportid;
 557
 558         int match_len;
 559
 560         __le16 frame_type;
 561
 562         u8 match[];
 563 };
 564
 565 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_portid,
 566                                 u16 frame_type, const u8 *match_data,
 567                                 int match_len)
 568 {
 569         struct wiphy *wiphy = wdev->wiphy;
 570         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 571         struct cfg80211_mgmt_registration *reg, *nreg;
 572         int err = 0;
 573         u16 mgmt_type;
 574
 575         if (!wdev->wiphy->mgmt_stypes)
 576                 return -EOPNOTSUPP;
 577
 578         if ((frame_type & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT)
 579                 return -EINVAL;
 580
 581         if (frame_type & ~(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE))
 582                 return -EINVAL;
 583
 584         mgmt_type = (frame_type & IEEE80211_FCTL_STYPE) >> 4;
 585         if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].rx & BIT(mgmt_type)))
 586                 return -EINVAL;
 587
 588         nreg = kzalloc(sizeof(*reg) + match_len, GFP_KERNEL);
 589         if (!nreg)
 590                 return -ENOMEM;
 591
 592         spin_lock_bh(&wdev->mgmt_registrations_lock);
 593
 594         list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
 595                 int mlen = min(match_len, reg->match_len);
 596
 597                 if (frame_type != le16_to_cpu(reg->frame_type))
 598                         continue;
 599
 600                 if (memcmp(reg->match, match_data, mlen) == 0) {
 601                         err = -EALREADY;
 602                         break;
 603                 }
 604         }
 605
 606         if (err) {
 607                 kfree(nreg);
 608                 goto out;
 609         }
 610
 611         memcpy(nreg->match, match_data, match_len);
 612         nreg->match_len = match_len;
 613         nreg->nlportid = snd_portid;
 614         nreg->frame_type = cpu_to_le16(frame_type);
 615         list_add(&nreg->list, &wdev->mgmt_registrations);
 616
 617         if (rdev->ops->mgmt_frame_register)
 618                 rdev_mgmt_frame_register(rdev, wdev, frame_type, true);
 619
 620  out:
 621         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 622
 623         return err;
 624 }
 625
 626 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlportid)
 627 {
 628         struct wiphy *wiphy = wdev->wiphy;
 629         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 630         struct cfg80211_mgmt_registration *reg, *tmp;
 631
 632         spin_lock_bh(&wdev->mgmt_registrations_lock);
 633
 634         list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
 635                 if (reg->nlportid != nlportid)
 636                         continue;
 637
 638                 if (rdev->ops->mgmt_frame_register) {
 639                         u16 frame_type = le16_to_cpu(reg->frame_type);
 640
 641                         rdev_mgmt_frame_register(rdev, wdev,
 642                                                  frame_type, false);
 643                 }
 644
 645                 list_del(&reg->list);
 646                 kfree(reg);
 647         }
 648
 649         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 650
 651         if (nlportid && rdev->crit_proto_nlportid == nlportid) {
 652                 rdev->crit_proto_nlportid = 0;
 653                 rdev_crit_proto_stop(rdev, wdev);
 654         }
 655
 656         if (nlportid == wdev->ap_unexpected_nlportid)
 657                 wdev->ap_unexpected_nlportid = 0;
 658 }
 659
 660 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev)
 661 {
 662         struct cfg80211_mgmt_registration *reg, *tmp;
 663
 664         spin_lock_bh(&wdev->mgmt_registrations_lock);
 665
 666         list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
 667                 list_del(&reg->list);
 668                 kfree(reg);
 669         }
 670
 671         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 672 }
 673
 674 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
 675                           struct wireless_dev *wdev,
 676                           struct ieee80211_channel *chan, bool offchan,
 677                           unsigned int wait, const u8 *buf, size_t len,
 678                           bool no_cck, bool dont_wait_for_ack, 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 (len < 24 + 1)
 690                 return -EINVAL;
 691
 692         mgmt = (const struct ieee80211_mgmt *) 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                 case NL80211_IFTYPE_STATION:
 710                 case NL80211_IFTYPE_P2P_CLIENT:
 711                         if (!wdev->current_bss) {
 712                                 err = -ENOTCONN;
 713                                 break;
 714                         }
 715
 716                         if (!ether_addr_equal(wdev->current_bss->pub.bssid,
 717                                               mgmt->bssid)) {
 718                                 err = -ENOTCONN;
 719                                 break;
 720                         }
 721
 722                         /*
 723                          * check for IBSS DA must be done by driver as
 724                          * cfg80211 doesn't track the stations
 725                          */
 726                         if (wdev->iftype == NL80211_IFTYPE_ADHOC)
 727                                 break;
 728
 729                         /* for station, check that DA is the AP */
 730                         if (!ether_addr_equal(wdev->current_bss->pub.bssid,
 731                                               mgmt->da)) {
 732                                 err = -ENOTCONN;
 733                                 break;
 734                         }
 735                         break;
 736                 case NL80211_IFTYPE_AP:
 737                 case NL80211_IFTYPE_P2P_GO:
 738                 case NL80211_IFTYPE_AP_VLAN:
 739                         if (!ether_addr_equal(mgmt->bssid, wdev_address(wdev)))
 740                                 err = -EINVAL;
 741                         break;
 742                 case NL80211_IFTYPE_MESH_POINT:
 743                         if (!ether_addr_equal(mgmt->sa, mgmt->bssid)) {
 744                                 err = -EINVAL;
 745                                 break;
 746                         }
 747                         /*
 748                          * check for mesh DA must be done by driver as
 749                          * cfg80211 doesn't track the stations
 750                          */
 751                         break;
 752                 case NL80211_IFTYPE_P2P_DEVICE:
 753                         /*
 754                          * fall through, P2P device only supports
 755                          * public action frames
 756                          */
 757                 default:
 758                         err = -EOPNOTSUPP;
 759                         break;
 760                 }
 761                 wdev_unlock(wdev);
 762
 763                 if (err)
 764                         return err;
 765         }
 766
 767         if (!ether_addr_equal(mgmt->sa, wdev_address(wdev)))
 768                 return -EINVAL;
 769
 770         /* Transmit the Action frame as requested by user space */
 771         return rdev_mgmt_tx(rdev, wdev, chan, offchan,
 772                             wait, buf, len, no_cck, dont_wait_for_ack,
 773                             cookie);
 774 }
 775
 776 bool cfg80211_rx_mgmt(struct wireless_dev *wdev, int freq, int sig_mbm,
 777                       const u8 *buf, size_t len, gfp_t gfp)
 778 {
 779         struct wiphy *wiphy = wdev->wiphy;
 780         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 781         struct cfg80211_mgmt_registration *reg;
 782         const struct ieee80211_txrx_stypes *stypes =
 783                 &wiphy->mgmt_stypes[wdev->iftype];
 784         struct ieee80211_mgmt *mgmt = (void *)buf;
 785         const u8 *data;
 786         int data_len;
 787         bool result = false;
 788         __le16 ftype = mgmt->frame_control &
 789                 cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE);
 790         u16 stype;
 791
 792         trace_cfg80211_rx_mgmt(wdev, freq, sig_mbm);
 793         stype = (le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE) >> 4;
 794
 795         if (!(stypes->rx & BIT(stype))) {
 796                 trace_cfg80211_return_bool(false);
 797                 return false;
 798         }
 799
 800         data = buf + ieee80211_hdrlen(mgmt->frame_control);
 801         data_len = len - ieee80211_hdrlen(mgmt->frame_control);
 802
 803         spin_lock_bh(&wdev->mgmt_registrations_lock);
 804
 805         list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
 806                 if (reg->frame_type != ftype)
 807                         continue;
 808
 809                 if (reg->match_len > data_len)
 810                         continue;
 811
 812                 if (memcmp(reg->match, data, reg->match_len))
 813                         continue;
 814
 815                 /* found match! */
 816
 817                 /* Indicate the received Action frame to user space */
 818                 if (nl80211_send_mgmt(rdev, wdev, reg->nlportid,
 819                                       freq, sig_mbm,
 820                                       buf, len, gfp))
 821                         continue;
 822
 823                 result = true;
 824                 break;
 825         }
 826
 827         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 828
 829         trace_cfg80211_return_bool(result);
 830         return result;
 831 }
 832 EXPORT_SYMBOL(cfg80211_rx_mgmt);
 833
 834 void cfg80211_dfs_channels_update_work(struct work_struct *work)
 835 {
 836         struct delayed_work *delayed_work;
 837         struct cfg80211_registered_device *rdev;
 838         struct cfg80211_chan_def chandef;
 839         struct ieee80211_supported_band *sband;
 840         struct ieee80211_channel *c;
 841         struct wiphy *wiphy;
 842         bool check_again = false;
 843         unsigned long timeout, next_time = 0;
 844         int bandid, i;
 845
 846         delayed_work = container_of(work, struct delayed_work, work);
 847         rdev = container_of(delayed_work, struct cfg80211_registered_device,
 848                             dfs_update_channels_wk);
 849         wiphy = &rdev->wiphy;
 850
 851         mutex_lock(&cfg80211_mutex);
 852         for (bandid = 0; bandid < IEEE80211_NUM_BANDS; bandid++) {
 853                 sband = wiphy->bands[bandid];
 854                 if (!sband)
 855                         continue;
 856
 857                 for (i = 0; i < sband->n_channels; i++) {
 858                         c = &sband->channels[i];
 859
 860                         if (c->dfs_state != NL80211_DFS_UNAVAILABLE)
 861                                 continue;
 862
 863                         timeout = c->dfs_state_entered +
 864                                   IEEE80211_DFS_MIN_NOP_TIME_MS;
 865
 866                         if (time_after_eq(jiffies, timeout)) {
 867                                 c->dfs_state = NL80211_DFS_USABLE;
 868                                 cfg80211_chandef_create(&chandef, c,
 869                                                         NL80211_CHAN_NO_HT);
 870
 871                                 nl80211_radar_notify(rdev, &chandef,
 872                                                      NL80211_RADAR_NOP_FINISHED,
 873                                                      NULL, GFP_ATOMIC);
 874                                 continue;
 875                         }
 876
 877                         if (!check_again)
 878                                 next_time = timeout - jiffies;
 879                         else
 880                                 next_time = min(next_time, timeout - jiffies);
 881                         check_again = true;
 882                 }
 883         }
 884         mutex_unlock(&cfg80211_mutex);
 885
 886         /* reschedule if there are other channels waiting to be cleared again */
 887         if (check_again)
 888                 queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
 889                                    next_time);
 890 }
 891
 892
 893 void cfg80211_radar_event(struct wiphy *wiphy,
 894                           struct cfg80211_chan_def *chandef,
 895                           gfp_t gfp)
 896 {
 897         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 898         unsigned long timeout;
 899
 900         trace_cfg80211_radar_event(wiphy, chandef);
 901
 902         /* only set the chandef supplied channel to unavailable, in
 903          * case the radar is detected on only one of multiple channels
 904          * spanned by the chandef.
 905          */
 906         cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_UNAVAILABLE);
 907
 908         timeout = msecs_to_jiffies(IEEE80211_DFS_MIN_NOP_TIME_MS);
 909         queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
 910                            timeout);
 911
 912         nl80211_radar_notify(rdev, chandef, NL80211_RADAR_DETECTED, NULL, gfp);
 913 }
 914 EXPORT_SYMBOL(cfg80211_radar_event);
 915
 916 void cfg80211_cac_event(struct net_device *netdev,
 917                         enum nl80211_radar_event event, gfp_t gfp)
 918 {
 919         struct wireless_dev *wdev = netdev->ieee80211_ptr;
 920         struct wiphy *wiphy = wdev->wiphy;
 921         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 922         struct cfg80211_chan_def chandef;
 923         unsigned long timeout;
 924
 925         trace_cfg80211_cac_event(netdev, event);
 926
 927         if (WARN_ON(!wdev->cac_started))
 928                 return;
 929
 930         if (WARN_ON(!wdev->channel))
 931                 return;
 932
 933         cfg80211_chandef_create(&chandef, wdev->channel, NL80211_CHAN_NO_HT);
 934
 935         switch (event) {
 936         case NL80211_RADAR_CAC_FINISHED:
 937                 timeout = wdev->cac_start_time +
 938                           msecs_to_jiffies(IEEE80211_DFS_MIN_CAC_TIME_MS);
 939                 WARN_ON(!time_after_eq(jiffies, timeout));
 940                 cfg80211_set_dfs_state(wiphy, &chandef, NL80211_DFS_AVAILABLE);
 941                 break;
 942         case NL80211_RADAR_CAC_ABORTED:
 943                 break;
 944         default:
 945                 WARN_ON(1);
 946                 return;
 947         }
 948         wdev->cac_started = false;
 949
 950         nl80211_radar_notify(rdev, &chandef, event, netdev, gfp);
 951 }
 952 EXPORT_SYMBOL(cfg80211_cac_event);