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 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         if (cmd != SIOCGIFADDR && cmd != SIOCSIFADDR)
  66                 return err;
  67
  68         rtnl_lock();
  69
  70         switch (cmd) {
  71         case SIOCGIFADDR:
  72         {
  73                 u16 pan_id, short_addr;
  74
  75                 pan_id = le16_to_cpu(wpan_dev->pan_id);
  76                 short_addr = le16_to_cpu(wpan_dev->short_addr);
  77                 if (pan_id == IEEE802154_PANID_BROADCAST ||
  78                     short_addr == IEEE802154_ADDR_BROADCAST) {
  79                         err = -EADDRNOTAVAIL;
  80                         break;
  81                 }
  82
  83                 sa->family = AF_IEEE802154;
  84                 sa->addr.addr_type = IEEE802154_ADDR_SHORT;
  85                 sa->addr.pan_id = pan_id;
  86                 sa->addr.short_addr = short_addr;
  87
  88                 err = 0;
  89                 break;
  90         }
  91         case SIOCSIFADDR:
  92                 if (netif_running(dev)) {
  93                         rtnl_unlock();
  94                         return -EBUSY;
  95                 }
  96
  97                 dev_warn(&dev->dev,
  98                          "Using DEBUGing ioctl SIOCSIFADDR isn't recommended!\n");
  99                 if (sa->family != AF_IEEE802154 ||
 100                     sa->addr.addr_type != IEEE802154_ADDR_SHORT ||
 101                     sa->addr.pan_id == IEEE802154_PANID_BROADCAST ||
 102                     sa->addr.short_addr == IEEE802154_ADDR_BROADCAST ||
 103                     sa->addr.short_addr == IEEE802154_ADDR_UNDEF) {
 104                         err = -EINVAL;
 105                         break;
 106                 }
 107
 108                 wpan_dev->pan_id = cpu_to_le16(sa->addr.pan_id);
 109                 wpan_dev->short_addr = cpu_to_le16(sa->addr.short_addr);
 110
 111                 err = mac802154_wpan_update_llsec(dev);
 112                 break;
 113         }
 114
 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_unicast_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 ieee802154_setup_hw(struct ieee802154_sub_if_data *sdata)
 139 {
 140         struct ieee802154_local *local = sdata->local;
 141         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 142         int ret;
 143
 144         if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
 145                 ret = drv_set_promiscuous_mode(local,
 146                                                wpan_dev->promiscuous_mode);
 147                 if (ret < 0)
 148                         return ret;
 149         }
 150
 151         if (local->hw.flags & IEEE802154_HW_AFILT) {
 152                 ret = drv_set_pan_id(local, wpan_dev->pan_id);
 153                 if (ret < 0)
 154                         return ret;
 155
 156                 ret = drv_set_extended_addr(local, wpan_dev->extended_addr);
 157                 if (ret < 0)
 158                         return ret;
 159
 160                 ret = drv_set_short_addr(local, wpan_dev->short_addr);
 161                 if (ret < 0)
 162                         return ret;
 163         }
 164
 165         if (local->hw.flags & IEEE802154_HW_LBT) {
 166                 ret = drv_set_lbt_mode(local, wpan_dev->lbt);
 167                 if (ret < 0)
 168                         return ret;
 169         }
 170
 171         if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
 172                 ret = drv_set_csma_params(local, wpan_dev->min_be,
 173                                           wpan_dev->max_be,
 174                                           wpan_dev->csma_retries);
 175                 if (ret < 0)
 176                         return ret;
 177         }
 178
 179         if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
 180                 ret = drv_set_max_frame_retries(local, wpan_dev->frame_retries);
 181                 if (ret < 0)
 182                         return ret;
 183         }
 184
 185         return 0;
 186 }
 187
 188 static int mac802154_slave_open(struct net_device *dev)
 189 {
 190         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 191         struct ieee802154_local *local = sdata->local;
 192         int res;
 193
 194         ASSERT_RTNL();
 195
 196         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 197
 198         if (!local->open_count) {
 199                 res = ieee802154_setup_hw(sdata);
 200                 if (res)
 201                         goto err;
 202
 203                 res = drv_start(local);
 204                 if (res)
 205                         goto err;
 206         }
 207
 208         local->open_count++;
 209         netif_start_queue(dev);
 210         return 0;
 211 err:
 212         /* might already be clear but that doesn't matter */
 213         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 214
 215         return res;
 216 }
 217
 218 static int
 219 ieee802154_check_mac_settings(struct ieee802154_local *local,
 220                               struct wpan_dev *wpan_dev,
 221                               struct wpan_dev *nwpan_dev)
 222 {
 223         ASSERT_RTNL();
 224
 225         if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
 226                 if (wpan_dev->promiscuous_mode != nwpan_dev->promiscuous_mode)
 227                         return -EBUSY;
 228         }
 229
 230         if (local->hw.flags & IEEE802154_HW_AFILT) {
 231                 if (wpan_dev->pan_id != nwpan_dev->pan_id ||
 232                     wpan_dev->short_addr != nwpan_dev->short_addr ||
 233                     wpan_dev->extended_addr != nwpan_dev->extended_addr)
 234                         return -EBUSY;
 235         }
 236
 237         if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
 238                 if (wpan_dev->min_be != nwpan_dev->min_be ||
 239                     wpan_dev->max_be != nwpan_dev->max_be ||
 240                     wpan_dev->csma_retries != nwpan_dev->csma_retries)
 241                         return -EBUSY;
 242         }
 243
 244         if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
 245                 if (wpan_dev->frame_retries != nwpan_dev->frame_retries)
 246                         return -EBUSY;
 247         }
 248
 249         if (local->hw.flags & IEEE802154_HW_LBT) {
 250                 if (wpan_dev->lbt != nwpan_dev->lbt)
 251                         return -EBUSY;
 252         }
 253
 254         return 0;
 255 }
 256
 257 static int
 258 ieee802154_check_concurrent_iface(struct ieee802154_sub_if_data *sdata,
 259                                   enum nl802154_iftype iftype)
 260 {
 261         struct ieee802154_local *local = sdata->local;
 262         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 263         struct ieee802154_sub_if_data *nsdata;
 264
 265         /* we hold the RTNL here so can safely walk the list */
 266         list_for_each_entry(nsdata, &local->interfaces, list) {
 267                 if (nsdata != sdata && ieee802154_sdata_running(nsdata)) {
 268                         int ret;
 269
 270                         /* TODO currently we don't support multiple node types
 271                          * we need to run skb_clone at rx path. Check if there
 272                          * exist really an use case if we need to support
 273                          * multiple node types at the same time.
 274                          */
 275                         if (wpan_dev->iftype == NL802154_IFTYPE_NODE &&
 276                             nsdata->wpan_dev.iftype == NL802154_IFTYPE_NODE)
 277                                 return -EBUSY;
 278
 279                         /* check all phy mac sublayer settings are the same.
 280                          * We have only one phy, different values makes trouble.
 281                          */
 282                         ret = ieee802154_check_mac_settings(local, wpan_dev,
 283                                                             &nsdata->wpan_dev);
 284                         if (ret < 0)
 285                                 return ret;
 286                 }
 287         }
 288
 289         return 0;
 290 }
 291
 292 static int mac802154_wpan_open(struct net_device *dev)
 293 {
 294         int rc;
 295         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 296         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 297
 298         rc = ieee802154_check_concurrent_iface(sdata, wpan_dev->iftype);
 299         if (rc < 0)
 300                 return rc;
 301
 302         return mac802154_slave_open(dev);
 303 }
 304
 305 static int mac802154_slave_close(struct net_device *dev)
 306 {
 307         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 308         struct ieee802154_local *local = sdata->local;
 309
 310         ASSERT_RTNL();
 311
 312         netif_stop_queue(dev);
 313         local->open_count--;
 314
 315         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 316
 317         if (!local->open_count)
 318                 ieee802154_stop_device(local);
 319
 320         return 0;
 321 }
 322
 323 static int mac802154_set_header_security(struct ieee802154_sub_if_data *sdata,
 324                                          struct ieee802154_hdr *hdr,
 325                                          const struct ieee802154_mac_cb *cb)
 326 {
 327         struct ieee802154_llsec_params params;
 328         u8 level;
 329
 330         mac802154_llsec_get_params(&sdata->sec, &params);
 331
 332         if (!params.enabled && cb->secen_override && cb->secen)
 333                 return -EINVAL;
 334         if (!params.enabled ||
 335             (cb->secen_override && !cb->secen) ||
 336             !params.out_level)
 337                 return 0;
 338         if (cb->seclevel_override && !cb->seclevel)
 339                 return -EINVAL;
 340
 341         level = cb->seclevel_override ? cb->seclevel : params.out_level;
 342
 343         hdr->fc.security_enabled = 1;
 344         hdr->sec.level = level;
 345         hdr->sec.key_id_mode = params.out_key.mode;
 346         if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
 347                 hdr->sec.short_src = params.out_key.short_source;
 348         else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
 349                 hdr->sec.extended_src = params.out_key.extended_source;
 350         hdr->sec.key_id = params.out_key.id;
 351
 352         return 0;
 353 }
 354
 355 static int mac802154_header_create(struct sk_buff *skb,
 356                                    struct net_device *dev,
 357                                    unsigned short type,
 358                                    const void *daddr,
 359                                    const void *saddr,
 360                                    unsigned len)
 361 {
 362         struct ieee802154_hdr hdr;
 363         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 364         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 365         struct ieee802154_mac_cb *cb = mac_cb(skb);
 366         int hlen;
 367
 368         if (!daddr)
 369                 return -EINVAL;
 370
 371         memset(&hdr.fc, 0, sizeof(hdr.fc));
 372         hdr.fc.type = cb->type;
 373         hdr.fc.security_enabled = cb->secen;
 374         hdr.fc.ack_request = cb->ackreq;
 375         hdr.seq = atomic_inc_return(&dev->ieee802154_ptr->dsn) & 0xFF;
 376
 377         if (mac802154_set_header_security(sdata, &hdr, cb) < 0)
 378                 return -EINVAL;
 379
 380         if (!saddr) {
 381                 if (wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
 382                     wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
 383                     wpan_dev->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
 384                         hdr.source.mode = IEEE802154_ADDR_LONG;
 385                         hdr.source.extended_addr = wpan_dev->extended_addr;
 386                 } else {
 387                         hdr.source.mode = IEEE802154_ADDR_SHORT;
 388                         hdr.source.short_addr = wpan_dev->short_addr;
 389                 }
 390
 391                 hdr.source.pan_id = wpan_dev->pan_id;
 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         int ret;
 472         u8 tmp;
 473
 474         /* set some type-dependent values */
 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                 mutex_init(&sdata->sec_mtx);
 504
 505                 mac802154_llsec_init(&sdata->sec);
 506                 ret = mac802154_wpan_update_llsec(sdata->dev);
 507                 if (ret < 0)
 508                         return ret;
 509
 510                 break;
 511         case NL802154_IFTYPE_MONITOR:
 512                 sdata->dev->destructor = free_netdev;
 513                 sdata->dev->netdev_ops = &mac802154_monitor_ops;
 514                 wpan_dev->promiscuous_mode = true;
 515                 break;
 516         default:
 517                 BUG();
 518         }
 519
 520         return 0;
 521 }
 522
 523 struct net_device *
 524 ieee802154_if_add(struct ieee802154_local *local, const char *name,
 525                   unsigned char name_assign_type, enum nl802154_iftype type,
 526                   __le64 extended_addr)
 527 {
 528         struct net_device *ndev = NULL;
 529         struct ieee802154_sub_if_data *sdata = NULL;
 530         int ret = -ENOMEM;
 531
 532         ASSERT_RTNL();
 533
 534         ndev = alloc_netdev(sizeof(*sdata), name,
 535                             name_assign_type, ieee802154_if_setup);
 536         if (!ndev)
 537                 return ERR_PTR(-ENOMEM);
 538
 539         ndev->needed_headroom = local->hw.extra_tx_headroom;
 540
 541         ret = dev_alloc_name(ndev, ndev->name);
 542         if (ret < 0)
 543                 goto err;
 544
 545         ieee802154_le64_to_be64(ndev->perm_addr,
 546                                 &local->hw.phy->perm_extended_addr);
 547         switch (type) {
 548         case NL802154_IFTYPE_NODE:
 549                 ndev->type = ARPHRD_IEEE802154;
 550                 if (ieee802154_is_valid_extended_unicast_addr(extended_addr))
 551                         ieee802154_le64_to_be64(ndev->dev_addr, &extended_addr);
 552                 else
 553                         memcpy(ndev->dev_addr, ndev->perm_addr,
 554                                IEEE802154_EXTENDED_ADDR_LEN);
 555                 break;
 556         case NL802154_IFTYPE_MONITOR:
 557                 ndev->type = ARPHRD_IEEE802154_MONITOR;
 558                 break;
 559         default:
 560                 ret = -EINVAL;
 561                 goto err;
 562         }
 563
 564         /* TODO check this */
 565         SET_NETDEV_DEV(ndev, &local->phy->dev);
 566         sdata = netdev_priv(ndev);
 567         ndev->ieee802154_ptr = &sdata->wpan_dev;
 568         memcpy(sdata->name, ndev->name, IFNAMSIZ);
 569         sdata->dev = ndev;
 570         sdata->wpan_dev.wpan_phy = local->hw.phy;
 571         sdata->local = local;
 572
 573         /* setup type-dependent data */
 574         ret = ieee802154_setup_sdata(sdata, type);
 575         if (ret)
 576                 goto err;
 577
 578         ret = register_netdevice(ndev);
 579         if (ret < 0)
 580                 goto err;
 581
 582         mutex_lock(&local->iflist_mtx);
 583         list_add_tail_rcu(&sdata->list, &local->interfaces);
 584         mutex_unlock(&local->iflist_mtx);
 585
 586         return ndev;
 587
 588 err:
 589         free_netdev(ndev);
 590         return ERR_PTR(ret);
 591 }
 592
 593 void ieee802154_if_remove(struct ieee802154_sub_if_data *sdata)
 594 {
 595         ASSERT_RTNL();
 596
 597         mutex_lock(&sdata->local->iflist_mtx);
 598         list_del_rcu(&sdata->list);
 599         mutex_unlock(&sdata->local->iflist_mtx);
 600
 601         synchronize_rcu();
 602         unregister_netdevice(sdata->dev);
 603 }
 604
 605 void ieee802154_remove_interfaces(struct ieee802154_local *local)
 606 {
 607         struct ieee802154_sub_if_data *sdata, *tmp;
 608
 609         mutex_lock(&local->iflist_mtx);
 610         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 611                 list_del(&sdata->list);
 612
 613                 unregister_netdevice(sdata->dev);
 614         }
 615         mutex_unlock(&local->iflist_mtx);
 616 }
 617
 618 static int netdev_notify(struct notifier_block *nb,
 619                          unsigned long state, void *ptr)
 620 {
 621         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 622         struct ieee802154_sub_if_data *sdata;
 623
 624         if (state != NETDEV_CHANGENAME)
 625                 return NOTIFY_DONE;
 626
 627         if (!dev->ieee802154_ptr || !dev->ieee802154_ptr->wpan_phy)
 628                 return NOTIFY_DONE;
 629
 630         if (dev->ieee802154_ptr->wpan_phy->privid != mac802154_wpan_phy_privid)
 631                 return NOTIFY_DONE;
 632
 633         sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 634         memcpy(sdata->name, dev->name, IFNAMSIZ);
 635
 636         return NOTIFY_OK;
 637 }
 638
 639 static struct notifier_block mac802154_netdev_notifier = {
 640         .notifier_call = netdev_notify,
 641 };
 642
 643 int ieee802154_iface_init(void)
 644 {
 645         return register_netdevice_notifier(&mac802154_netdev_notifier);
 646 }
 647
 648 void ieee802154_iface_exit(void)
 649 {
 650         unregister_netdevice_notifier(&mac802154_netdev_notifier);
 651 }