net/mac802154/iface.c

   1 /*
   2  * Copyright 2007-2012 Siemens AG
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2
   6  * as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * Written by:
  14  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
  15  * Sergey Lapin <slapin@ossfans.org>
  16  * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
  17  * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
  18  */
  19
  20 #include <linux/netdevice.h>
  21 #include <linux/module.h>
  22 #include <linux/if_arp.h>
  23 #include <linux/ieee802154.h>
  24
  25 #include <net/nl802154.h>
  26 #include <net/mac802154.h>
  27 #include <net/ieee802154_netdev.h>
  28 #include <net/cfg802154.h>
  29
  30 #include "ieee802154_i.h"
  31 #include "driver-ops.h"
  32
  33 static int mac802154_wpan_update_llsec(struct net_device *dev)
  34 {
  35         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
  36         struct ieee802154_mlme_ops *ops = ieee802154_mlme_ops(dev);
  37         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
  38         int rc = 0;
  39
  40         if (ops->llsec) {
  41                 struct ieee802154_llsec_params params;
  42                 int changed = 0;
  43
  44                 params.pan_id = wpan_dev->pan_id;
  45                 changed |= IEEE802154_LLSEC_PARAM_PAN_ID;
  46
  47                 params.hwaddr = wpan_dev->extended_addr;
  48                 changed |= IEEE802154_LLSEC_PARAM_HWADDR;
  49
  50                 rc = ops->llsec->set_params(dev, &params, changed);
  51         }
  52
  53         return rc;
  54 }
  55
  56 static int
  57 mac802154_wpan_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
  58 {
  59         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
  60         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
  61         struct sockaddr_ieee802154 *sa =
  62                 (struct sockaddr_ieee802154 *)&ifr->ifr_addr;
  63         int err = -ENOIOCTLCMD;
  64
  65         rtnl_lock();
  66         spin_lock_bh(&sdata->mib_lock);
  67
  68         switch (cmd) {
  69         case SIOCGIFADDR:
  70         {
  71                 u16 pan_id, short_addr;
  72
  73                 pan_id = le16_to_cpu(wpan_dev->pan_id);
  74                 short_addr = le16_to_cpu(wpan_dev->short_addr);
  75                 if (pan_id == IEEE802154_PANID_BROADCAST ||
  76                     short_addr == IEEE802154_ADDR_BROADCAST) {
  77                         err = -EADDRNOTAVAIL;
  78                         break;
  79                 }
  80
  81                 sa->family = AF_IEEE802154;
  82                 sa->addr.addr_type = IEEE802154_ADDR_SHORT;
  83                 sa->addr.pan_id = pan_id;
  84                 sa->addr.short_addr = short_addr;
  85
  86                 err = 0;
  87                 break;
  88         }
  89         case SIOCSIFADDR:
  90                 if (netif_running(dev)) {
  91                         spin_unlock_bh(&sdata->mib_lock);
  92                         rtnl_unlock();
  93                         return -EBUSY;
  94                 }
  95
  96                 dev_warn(&dev->dev,
  97                          "Using DEBUGing ioctl SIOCSIFADDR isn't recommended!\n");
  98                 if (sa->family != AF_IEEE802154 ||
  99                     sa->addr.addr_type != IEEE802154_ADDR_SHORT ||
 100                     sa->addr.pan_id == IEEE802154_PANID_BROADCAST ||
 101                     sa->addr.short_addr == IEEE802154_ADDR_BROADCAST ||
 102                     sa->addr.short_addr == IEEE802154_ADDR_UNDEF) {
 103                         err = -EINVAL;
 104                         break;
 105                 }
 106
 107                 wpan_dev->pan_id = cpu_to_le16(sa->addr.pan_id);
 108                 wpan_dev->short_addr = cpu_to_le16(sa->addr.short_addr);
 109
 110                 err = mac802154_wpan_update_llsec(dev);
 111                 break;
 112         }
 113
 114         spin_unlock_bh(&sdata->mib_lock);
 115         rtnl_unlock();
 116         return err;
 117 }
 118
 119 static int mac802154_wpan_mac_addr(struct net_device *dev, void *p)
 120 {
 121         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 122         struct sockaddr *addr = p;
 123         __le64 extended_addr;
 124
 125         if (netif_running(dev))
 126                 return -EBUSY;
 127
 128         ieee802154_be64_to_le64(&extended_addr, addr->sa_data);
 129         if (!ieee802154_is_valid_extended_addr(extended_addr))
 130                 return -EINVAL;
 131
 132         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
 133         sdata->wpan_dev.extended_addr = extended_addr;
 134
 135         return mac802154_wpan_update_llsec(dev);
 136 }
 137
 138 static int mac802154_slave_open(struct net_device *dev)
 139 {
 140         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 141         struct ieee802154_local *local = sdata->local;
 142         int res = 0;
 143
 144         ASSERT_RTNL();
 145
 146         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 147
 148         if (!local->open_count) {
 149                 res = drv_start(local);
 150                 WARN_ON(res);
 151                 if (res)
 152                         goto err;
 153         }
 154
 155         local->open_count++;
 156         netif_start_queue(dev);
 157         return 0;
 158 err:
 159         /* might already be clear but that doesn't matter */
 160         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 161
 162         return res;
 163 }
 164
 165 static int
 166 ieee802154_check_mac_settings(struct ieee802154_local *local,
 167                               struct wpan_dev *wpan_dev,
 168                               struct wpan_dev *nwpan_dev)
 169 {
 170         ASSERT_RTNL();
 171
 172         if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
 173                 if (wpan_dev->promiscuous_mode != nwpan_dev->promiscuous_mode)
 174                         return -EBUSY;
 175         }
 176
 177         if (local->hw.flags & IEEE802154_HW_AFILT) {
 178                 if (wpan_dev->pan_id != nwpan_dev->pan_id ||
 179                     wpan_dev->short_addr != nwpan_dev->short_addr ||
 180                     wpan_dev->extended_addr != nwpan_dev->extended_addr)
 181                         return -EBUSY;
 182         }
 183
 184         if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
 185                 if (wpan_dev->min_be != nwpan_dev->min_be ||
 186                     wpan_dev->max_be != nwpan_dev->max_be ||
 187                     wpan_dev->csma_retries != nwpan_dev->csma_retries)
 188                         return -EBUSY;
 189         }
 190
 191         if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
 192                 if (wpan_dev->frame_retries != nwpan_dev->frame_retries)
 193                         return -EBUSY;
 194         }
 195
 196         if (local->hw.flags & IEEE802154_HW_LBT) {
 197                 if (wpan_dev->lbt != nwpan_dev->lbt)
 198                         return -EBUSY;
 199         }
 200
 201         return 0;
 202 }
 203
 204 static int
 205 ieee802154_check_concurrent_iface(struct ieee802154_sub_if_data *sdata,
 206                                   enum nl802154_iftype iftype)
 207 {
 208         struct ieee802154_local *local = sdata->local;
 209         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 210         struct ieee802154_sub_if_data *nsdata;
 211
 212         /* we hold the RTNL here so can safely walk the list */
 213         list_for_each_entry(nsdata, &local->interfaces, list) {
 214                 if (nsdata != sdata && ieee802154_sdata_running(nsdata)) {
 215                         int ret;
 216
 217                         /* TODO currently we don't support multiple node types
 218                          * we need to run skb_clone at rx path. Check if there
 219                          * exist really an use case if we need to support
 220                          * multiple node types at the same time.
 221                          */
 222                         if (sdata->vif.type == NL802154_IFTYPE_NODE &&
 223                             nsdata->vif.type == NL802154_IFTYPE_NODE)
 224                                 return -EBUSY;
 225
 226                         /* check all phy mac sublayer settings are the same.
 227                          * We have only one phy, different values makes trouble.
 228                          */
 229                         ret = ieee802154_check_mac_settings(local, wpan_dev,
 230                                                             &nsdata->wpan_dev);
 231                         if (ret < 0)
 232                                 return ret;
 233                 }
 234         }
 235
 236         return 0;
 237 }
 238
 239 static int mac802154_wpan_open(struct net_device *dev)
 240 {
 241         int rc;
 242         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 243         struct ieee802154_local *local = sdata->local;
 244         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 245
 246         rc = ieee802154_check_concurrent_iface(sdata, sdata->vif.type);
 247         if (rc < 0)
 248                 return rc;
 249
 250         rc = mac802154_slave_open(dev);
 251         if (rc < 0)
 252                 return rc;
 253
 254         if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
 255                 rc = drv_set_promiscuous_mode(local,
 256                                               wpan_dev->promiscuous_mode);
 257                 if (rc < 0)
 258                         goto out;
 259         }
 260
 261         if (local->hw.flags & IEEE802154_HW_AFILT) {
 262                 rc = drv_set_pan_id(local, wpan_dev->pan_id);
 263                 if (rc < 0)
 264                         goto out;
 265
 266                 rc = drv_set_extended_addr(local, wpan_dev->extended_addr);
 267                 if (rc < 0)
 268                         goto out;
 269
 270                 rc = drv_set_short_addr(local, wpan_dev->short_addr);
 271                 if (rc < 0)
 272                         goto out;
 273         }
 274
 275         if (local->hw.flags & IEEE802154_HW_LBT) {
 276                 rc = drv_set_lbt_mode(local, wpan_dev->lbt);
 277                 if (rc < 0)
 278                         goto out;
 279         }
 280
 281         if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
 282                 rc = drv_set_csma_params(local, wpan_dev->min_be,
 283                                          wpan_dev->max_be,
 284                                          wpan_dev->csma_retries);
 285                 if (rc < 0)
 286                         goto out;
 287         }
 288
 289         if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
 290                 rc = drv_set_max_frame_retries(local, wpan_dev->frame_retries);
 291                 if (rc < 0)
 292                         goto out;
 293         }
 294
 295 out:
 296         return rc;
 297 }
 298
 299 static int mac802154_slave_close(struct net_device *dev)
 300 {
 301         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 302         struct ieee802154_local *local = sdata->local;
 303
 304         ASSERT_RTNL();
 305
 306         hrtimer_cancel(&local->ifs_timer);
 307
 308         netif_stop_queue(dev);
 309         local->open_count--;
 310
 311         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 312
 313         if (!local->open_count)
 314                 drv_stop(local);
 315
 316         return 0;
 317 }
 318
 319 static int mac802154_set_header_security(struct ieee802154_sub_if_data *sdata,
 320                                          struct ieee802154_hdr *hdr,
 321                                          const struct ieee802154_mac_cb *cb)
 322 {
 323         struct ieee802154_llsec_params params;
 324         u8 level;
 325
 326         mac802154_llsec_get_params(&sdata->sec, &params);
 327
 328         if (!params.enabled && cb->secen_override && cb->secen)
 329                 return -EINVAL;
 330         if (!params.enabled ||
 331             (cb->secen_override && !cb->secen) ||
 332             !params.out_level)
 333                 return 0;
 334         if (cb->seclevel_override && !cb->seclevel)
 335                 return -EINVAL;
 336
 337         level = cb->seclevel_override ? cb->seclevel : params.out_level;
 338
 339         hdr->fc.security_enabled = 1;
 340         hdr->sec.level = level;
 341         hdr->sec.key_id_mode = params.out_key.mode;
 342         if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
 343                 hdr->sec.short_src = params.out_key.short_source;
 344         else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
 345                 hdr->sec.extended_src = params.out_key.extended_source;
 346         hdr->sec.key_id = params.out_key.id;
 347
 348         return 0;
 349 }
 350
 351 static int mac802154_header_create(struct sk_buff *skb,
 352                                    struct net_device *dev,
 353                                    unsigned short type,
 354                                    const void *daddr,
 355                                    const void *saddr,
 356                                    unsigned len)
 357 {
 358         struct ieee802154_hdr hdr;
 359         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 360         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 361         struct ieee802154_mac_cb *cb = mac_cb(skb);
 362         int hlen;
 363
 364         if (!daddr)
 365                 return -EINVAL;
 366
 367         memset(&hdr.fc, 0, sizeof(hdr.fc));
 368         hdr.fc.type = cb->type;
 369         hdr.fc.security_enabled = cb->secen;
 370         hdr.fc.ack_request = cb->ackreq;
 371         hdr.seq = atomic_inc_return(&dev->ieee802154_ptr->dsn) & 0xFF;
 372
 373         if (mac802154_set_header_security(sdata, &hdr, cb) < 0)
 374                 return -EINVAL;
 375
 376         if (!saddr) {
 377                 spin_lock_bh(&sdata->mib_lock);
 378
 379                 if (wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
 380                     wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
 381                     wpan_dev->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
 382                         hdr.source.mode = IEEE802154_ADDR_LONG;
 383                         hdr.source.extended_addr = wpan_dev->extended_addr;
 384                 } else {
 385                         hdr.source.mode = IEEE802154_ADDR_SHORT;
 386                         hdr.source.short_addr = wpan_dev->short_addr;
 387                 }
 388
 389                 hdr.source.pan_id = wpan_dev->pan_id;
 390
 391                 spin_unlock_bh(&sdata->mib_lock);
 392         } else {
 393                 hdr.source = *(const struct ieee802154_addr *)saddr;
 394         }
 395
 396         hdr.dest = *(const struct ieee802154_addr *)daddr;
 397
 398         hlen = ieee802154_hdr_push(skb, &hdr);
 399         if (hlen < 0)
 400                 return -EINVAL;
 401
 402         skb_reset_mac_header(skb);
 403         skb->mac_len = hlen;
 404
 405         if (len > ieee802154_max_payload(&hdr))
 406                 return -EMSGSIZE;
 407
 408         return hlen;
 409 }
 410
 411 static int
 412 mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 413 {
 414         struct ieee802154_hdr hdr;
 415         struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;
 416
 417         if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) {
 418                 pr_debug("malformed packet\n");
 419                 return 0;
 420         }
 421
 422         *addr = hdr.source;
 423         return sizeof(*addr);
 424 }
 425
 426 static struct header_ops mac802154_header_ops = {
 427         .create         = mac802154_header_create,
 428         .parse          = mac802154_header_parse,
 429 };
 430
 431 static const struct net_device_ops mac802154_wpan_ops = {
 432         .ndo_open               = mac802154_wpan_open,
 433         .ndo_stop               = mac802154_slave_close,
 434         .ndo_start_xmit         = ieee802154_subif_start_xmit,
 435         .ndo_do_ioctl           = mac802154_wpan_ioctl,
 436         .ndo_set_mac_address    = mac802154_wpan_mac_addr,
 437 };
 438
 439 static const struct net_device_ops mac802154_monitor_ops = {
 440         .ndo_open               = mac802154_wpan_open,
 441         .ndo_stop               = mac802154_slave_close,
 442         .ndo_start_xmit         = ieee802154_monitor_start_xmit,
 443 };
 444
 445 static void mac802154_wpan_free(struct net_device *dev)
 446 {
 447         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 448
 449         mac802154_llsec_destroy(&sdata->sec);
 450
 451         free_netdev(dev);
 452 }
 453
 454 static void ieee802154_if_setup(struct net_device *dev)
 455 {
 456         dev->addr_len           = IEEE802154_EXTENDED_ADDR_LEN;
 457         memset(dev->broadcast, 0xff, IEEE802154_EXTENDED_ADDR_LEN);
 458
 459         dev->hard_header_len    = MAC802154_FRAME_HARD_HEADER_LEN;
 460         dev->needed_tailroom    = 2 + 16; /* FCS + MIC */
 461         dev->mtu                = IEEE802154_MTU;
 462         dev->tx_queue_len       = 300;
 463         dev->flags              = IFF_NOARP | IFF_BROADCAST;
 464 }
 465
 466 static int
 467 ieee802154_setup_sdata(struct ieee802154_sub_if_data *sdata,
 468                        enum nl802154_iftype type)
 469 {
 470         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 471         u8 tmp;
 472
 473         /* set some type-dependent values */
 474         sdata->vif.type = type;
 475         sdata->wpan_dev.iftype = type;
 476
 477         get_random_bytes(&tmp, sizeof(tmp));
 478         atomic_set(&wpan_dev->bsn, tmp);
 479         get_random_bytes(&tmp, sizeof(tmp));
 480         atomic_set(&wpan_dev->dsn, tmp);
 481
 482         /* defaults per 802.15.4-2011 */
 483         wpan_dev->min_be = 3;
 484         wpan_dev->max_be = 5;
 485         wpan_dev->csma_retries = 4;
 486         /* for compatibility, actual default is 3 */
 487         wpan_dev->frame_retries = -1;
 488
 489         wpan_dev->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
 490         wpan_dev->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
 491
 492         switch (type) {
 493         case NL802154_IFTYPE_NODE:
 494                 ieee802154_be64_to_le64(&wpan_dev->extended_addr,
 495                                         sdata->dev->dev_addr);
 496
 497                 sdata->dev->header_ops = &mac802154_header_ops;
 498                 sdata->dev->destructor = mac802154_wpan_free;
 499                 sdata->dev->netdev_ops = &mac802154_wpan_ops;
 500                 sdata->dev->ml_priv = &mac802154_mlme_wpan;
 501                 wpan_dev->promiscuous_mode = false;
 502
 503                 spin_lock_init(&sdata->mib_lock);
 504                 mutex_init(&sdata->sec_mtx);
 505
 506                 mac802154_llsec_init(&sdata->sec);
 507                 break;
 508         case NL802154_IFTYPE_MONITOR:
 509                 sdata->dev->destructor = free_netdev;
 510                 sdata->dev->netdev_ops = &mac802154_monitor_ops;
 511                 wpan_dev->promiscuous_mode = true;
 512                 break;
 513         default:
 514                 BUG();
 515         }
 516
 517         return 0;
 518 }
 519
 520 struct net_device *
 521 ieee802154_if_add(struct ieee802154_local *local, const char *name,
 522                   unsigned char name_assign_type, enum nl802154_iftype type,
 523                   __le64 extended_addr)
 524 {
 525         struct net_device *ndev = NULL;
 526         struct ieee802154_sub_if_data *sdata = NULL;
 527         int ret = -ENOMEM;
 528
 529         ASSERT_RTNL();
 530
 531         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size, name,
 532                             name_assign_type, ieee802154_if_setup);
 533         if (!ndev)
 534                 return ERR_PTR(-ENOMEM);
 535
 536         ndev->needed_headroom = local->hw.extra_tx_headroom;
 537
 538         ret = dev_alloc_name(ndev, ndev->name);
 539         if (ret < 0)
 540                 goto err;
 541
 542         ieee802154_le64_to_be64(ndev->perm_addr,
 543                                 &local->hw.phy->perm_extended_addr);
 544         switch (type) {
 545         case NL802154_IFTYPE_NODE:
 546                 ndev->type = ARPHRD_IEEE802154;
 547                 if (ieee802154_is_valid_extended_addr(extended_addr))
 548                         ieee802154_le64_to_be64(ndev->dev_addr, &extended_addr);
 549                 else
 550                         memcpy(ndev->dev_addr, ndev->perm_addr,
 551                                IEEE802154_EXTENDED_ADDR_LEN);
 552                 break;
 553         case NL802154_IFTYPE_MONITOR:
 554                 ndev->type = ARPHRD_IEEE802154_MONITOR;
 555                 break;
 556         default:
 557                 ret = -EINVAL;
 558                 goto err;
 559         }
 560
 561         /* TODO check this */
 562         SET_NETDEV_DEV(ndev, &local->phy->dev);
 563         sdata = netdev_priv(ndev);
 564         ndev->ieee802154_ptr = &sdata->wpan_dev;
 565         memcpy(sdata->name, ndev->name, IFNAMSIZ);
 566         sdata->dev = ndev;
 567         sdata->wpan_dev.wpan_phy = local->hw.phy;
 568         sdata->local = local;
 569
 570         /* setup type-dependent data */
 571         ret = ieee802154_setup_sdata(sdata, type);
 572         if (ret)
 573                 goto err;
 574
 575         ret = register_netdevice(ndev);
 576         if (ret < 0)
 577                 goto err;
 578
 579         mutex_lock(&local->iflist_mtx);
 580         list_add_tail_rcu(&sdata->list, &local->interfaces);
 581         mutex_unlock(&local->iflist_mtx);
 582
 583         return ndev;
 584
 585 err:
 586         free_netdev(ndev);
 587         return ERR_PTR(ret);
 588 }
 589
 590 void ieee802154_if_remove(struct ieee802154_sub_if_data *sdata)
 591 {
 592         ASSERT_RTNL();
 593
 594         mutex_lock(&sdata->local->iflist_mtx);
 595         list_del_rcu(&sdata->list);
 596         mutex_unlock(&sdata->local->iflist_mtx);
 597
 598         synchronize_rcu();
 599         unregister_netdevice(sdata->dev);
 600 }
 601
 602 void ieee802154_remove_interfaces(struct ieee802154_local *local)
 603 {
 604         struct ieee802154_sub_if_data *sdata, *tmp;
 605
 606         mutex_lock(&local->iflist_mtx);
 607         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 608                 list_del(&sdata->list);
 609
 610                 unregister_netdevice(sdata->dev);
 611         }
 612         mutex_unlock(&local->iflist_mtx);
 613 }
 614
 615 static int netdev_notify(struct notifier_block *nb,
 616                          unsigned long state, void *ptr)
 617 {
 618         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 619         struct ieee802154_sub_if_data *sdata;
 620
 621         if (state != NETDEV_CHANGENAME)
 622                 return NOTIFY_DONE;
 623
 624         if (!dev->ieee802154_ptr || !dev->ieee802154_ptr->wpan_phy)
 625                 return NOTIFY_DONE;
 626
 627         if (dev->ieee802154_ptr->wpan_phy->privid != mac802154_wpan_phy_privid)
 628                 return NOTIFY_DONE;
 629
 630         sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 631         memcpy(sdata->name, dev->name, IFNAMSIZ);
 632
 633         return NOTIFY_OK;
 634 }
 635
 636 static struct notifier_block mac802154_netdev_notifier = {
 637         .notifier_call = netdev_notify,
 638 };
 639
 640 int ieee802154_iface_init(void)
 641 {
 642         return register_netdevice_notifier(&mac802154_netdev_notifier);
 643 }
 644
 645 void ieee802154_iface_exit(void)
 646 {
 647         unregister_netdevice_notifier(&mac802154_netdev_notifier);
 648 }