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         ASSERT_RTNL();
  66
  67         spin_lock_bh(&sdata->mib_lock);
  68
  69         switch (cmd) {
  70         case SIOCGIFADDR:
  71         {
  72                 u16 pan_id, short_addr;
  73
  74                 pan_id = le16_to_cpu(wpan_dev->pan_id);
  75                 short_addr = le16_to_cpu(wpan_dev->short_addr);
  76                 if (pan_id == IEEE802154_PANID_BROADCAST ||
  77                     short_addr == IEEE802154_ADDR_BROADCAST) {
  78                         err = -EADDRNOTAVAIL;
  79                         break;
  80                 }
  81
  82                 sa->family = AF_IEEE802154;
  83                 sa->addr.addr_type = IEEE802154_ADDR_SHORT;
  84                 sa->addr.pan_id = pan_id;
  85                 sa->addr.short_addr = short_addr;
  86
  87                 err = 0;
  88                 break;
  89         }
  90         case SIOCSIFADDR:
  91                 if (netif_running(dev)) {
  92                         spin_unlock_bh(&sdata->mib_lock);
  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         return err;
 116 }
 117
 118 static int mac802154_wpan_mac_addr(struct net_device *dev, void *p)
 119 {
 120         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 121         struct sockaddr *addr = p;
 122         __le64 extended_addr;
 123
 124         if (netif_running(dev))
 125                 return -EBUSY;
 126
 127         ieee802154_be64_to_le64(&extended_addr, addr->sa_data);
 128         if (!ieee802154_is_valid_extended_addr(extended_addr))
 129                 return -EINVAL;
 130
 131         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
 132         sdata->wpan_dev.extended_addr = extended_addr;
 133
 134         return mac802154_wpan_update_llsec(dev);
 135 }
 136
 137 static int mac802154_slave_open(struct net_device *dev)
 138 {
 139         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 140         struct ieee802154_local *local = sdata->local;
 141         int res = 0;
 142
 143         ASSERT_RTNL();
 144
 145         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 146
 147         if (!local->open_count) {
 148                 res = drv_start(local);
 149                 WARN_ON(res);
 150                 if (res)
 151                         goto err;
 152         }
 153
 154         local->open_count++;
 155         netif_start_queue(dev);
 156         return 0;
 157 err:
 158         /* might already be clear but that doesn't matter */
 159         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 160
 161         return res;
 162 }
 163
 164 static int
 165 ieee802154_check_mac_settings(struct ieee802154_local *local,
 166                               struct wpan_dev *wpan_dev,
 167                               struct wpan_dev *nwpan_dev)
 168 {
 169         ASSERT_RTNL();
 170
 171         if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
 172                 if (wpan_dev->promiscuous_mode != nwpan_dev->promiscuous_mode)
 173                         return -EBUSY;
 174         }
 175
 176         if (local->hw.flags & IEEE802154_HW_AFILT) {
 177                 if (wpan_dev->pan_id != nwpan_dev->pan_id ||
 178                     wpan_dev->short_addr != nwpan_dev->short_addr ||
 179                     wpan_dev->extended_addr != nwpan_dev->extended_addr)
 180                         return -EBUSY;
 181         }
 182
 183         if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
 184                 if (wpan_dev->min_be != nwpan_dev->min_be ||
 185                     wpan_dev->max_be != nwpan_dev->max_be ||
 186                     wpan_dev->csma_retries != nwpan_dev->csma_retries)
 187                         return -EBUSY;
 188         }
 189
 190         if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
 191                 if (wpan_dev->frame_retries != nwpan_dev->frame_retries)
 192                         return -EBUSY;
 193         }
 194
 195         if (local->hw.flags & IEEE802154_HW_LBT) {
 196                 if (wpan_dev->lbt != nwpan_dev->lbt)
 197                         return -EBUSY;
 198         }
 199
 200         return 0;
 201 }
 202
 203 static int
 204 ieee802154_check_concurrent_iface(struct ieee802154_sub_if_data *sdata,
 205                                   enum nl802154_iftype iftype)
 206 {
 207         struct ieee802154_local *local = sdata->local;
 208         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 209         struct ieee802154_sub_if_data *nsdata;
 210
 211         /* we hold the RTNL here so can safely walk the list */
 212         list_for_each_entry(nsdata, &local->interfaces, list) {
 213                 if (nsdata != sdata && ieee802154_sdata_running(nsdata)) {
 214                         int ret;
 215
 216                         /* TODO currently we don't support multiple node types
 217                          * we need to run skb_clone at rx path. Check if there
 218                          * exist really an use case if we need to support
 219                          * multiple node types at the same time.
 220                          */
 221                         if (sdata->vif.type == NL802154_IFTYPE_NODE &&
 222                             nsdata->vif.type == NL802154_IFTYPE_NODE)
 223                                 return -EBUSY;
 224
 225                         /* check all phy mac sublayer settings are the same.
 226                          * We have only one phy, different values makes trouble.
 227                          */
 228                         ret = ieee802154_check_mac_settings(local, wpan_dev,
 229                                                             &nsdata->wpan_dev);
 230                         if (ret < 0)
 231                                 return ret;
 232                 }
 233         }
 234
 235         return 0;
 236 }
 237
 238 static int mac802154_wpan_open(struct net_device *dev)
 239 {
 240         int rc;
 241         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 242         struct ieee802154_local *local = sdata->local;
 243         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 244         struct wpan_phy *phy = sdata->local->phy;
 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         mutex_lock(&phy->pib_lock);
 255
 256         if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
 257                 rc = drv_set_promiscuous_mode(local,
 258                                               wpan_dev->promiscuous_mode);
 259                 if (rc < 0)
 260                         goto out;
 261         }
 262
 263         if (local->hw.flags & IEEE802154_HW_AFILT) {
 264                 rc = drv_set_pan_id(local, wpan_dev->pan_id);
 265                 if (rc < 0)
 266                         goto out;
 267
 268                 rc = drv_set_extended_addr(local, wpan_dev->extended_addr);
 269                 if (rc < 0)
 270                         goto out;
 271
 272                 rc = drv_set_short_addr(local, wpan_dev->short_addr);
 273                 if (rc < 0)
 274                         goto out;
 275         }
 276
 277         if (local->hw.flags & IEEE802154_HW_LBT) {
 278                 rc = drv_set_lbt_mode(local, wpan_dev->lbt);
 279                 if (rc < 0)
 280                         goto out;
 281         }
 282
 283         if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
 284                 rc = drv_set_csma_params(local, wpan_dev->min_be,
 285                                          wpan_dev->max_be,
 286                                          wpan_dev->csma_retries);
 287                 if (rc < 0)
 288                         goto out;
 289         }
 290
 291         if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
 292                 rc = drv_set_max_frame_retries(local, wpan_dev->frame_retries);
 293                 if (rc < 0)
 294                         goto out;
 295         }
 296
 297         mutex_unlock(&phy->pib_lock);
 298         return 0;
 299
 300 out:
 301         mutex_unlock(&phy->pib_lock);
 302         return rc;
 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         hrtimer_cancel(&local->ifs_timer);
 313
 314         netif_stop_queue(dev);
 315         local->open_count--;
 316
 317         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 318
 319         if (!local->open_count)
 320                 drv_stop(local);
 321
 322         return 0;
 323 }
 324
 325 static int mac802154_set_header_security(struct ieee802154_sub_if_data *sdata,
 326                                          struct ieee802154_hdr *hdr,
 327                                          const struct ieee802154_mac_cb *cb)
 328 {
 329         struct ieee802154_llsec_params params;
 330         u8 level;
 331
 332         mac802154_llsec_get_params(&sdata->sec, &params);
 333
 334         if (!params.enabled && cb->secen_override && cb->secen)
 335                 return -EINVAL;
 336         if (!params.enabled ||
 337             (cb->secen_override && !cb->secen) ||
 338             !params.out_level)
 339                 return 0;
 340         if (cb->seclevel_override && !cb->seclevel)
 341                 return -EINVAL;
 342
 343         level = cb->seclevel_override ? cb->seclevel : params.out_level;
 344
 345         hdr->fc.security_enabled = 1;
 346         hdr->sec.level = level;
 347         hdr->sec.key_id_mode = params.out_key.mode;
 348         if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
 349                 hdr->sec.short_src = params.out_key.short_source;
 350         else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
 351                 hdr->sec.extended_src = params.out_key.extended_source;
 352         hdr->sec.key_id = params.out_key.id;
 353
 354         return 0;
 355 }
 356
 357 static int mac802154_header_create(struct sk_buff *skb,
 358                                    struct net_device *dev,
 359                                    unsigned short type,
 360                                    const void *daddr,
 361                                    const void *saddr,
 362                                    unsigned len)
 363 {
 364         struct ieee802154_hdr hdr;
 365         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 366         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 367         struct ieee802154_mac_cb *cb = mac_cb(skb);
 368         int hlen;
 369
 370         if (!daddr)
 371                 return -EINVAL;
 372
 373         memset(&hdr.fc, 0, sizeof(hdr.fc));
 374         hdr.fc.type = cb->type;
 375         hdr.fc.security_enabled = cb->secen;
 376         hdr.fc.ack_request = cb->ackreq;
 377         hdr.seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
 378
 379         if (mac802154_set_header_security(sdata, &hdr, cb) < 0)
 380                 return -EINVAL;
 381
 382         if (!saddr) {
 383                 spin_lock_bh(&sdata->mib_lock);
 384
 385                 if (wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
 386                     wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
 387                     wpan_dev->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
 388                         hdr.source.mode = IEEE802154_ADDR_LONG;
 389                         hdr.source.extended_addr = wpan_dev->extended_addr;
 390                 } else {
 391                         hdr.source.mode = IEEE802154_ADDR_SHORT;
 392                         hdr.source.short_addr = wpan_dev->short_addr;
 393                 }
 394
 395                 hdr.source.pan_id = wpan_dev->pan_id;
 396
 397                 spin_unlock_bh(&sdata->mib_lock);
 398         } else {
 399                 hdr.source = *(const struct ieee802154_addr *)saddr;
 400         }
 401
 402         hdr.dest = *(const struct ieee802154_addr *)daddr;
 403
 404         hlen = ieee802154_hdr_push(skb, &hdr);
 405         if (hlen < 0)
 406                 return -EINVAL;
 407
 408         skb_reset_mac_header(skb);
 409         skb->mac_len = hlen;
 410
 411         if (len > ieee802154_max_payload(&hdr))
 412                 return -EMSGSIZE;
 413
 414         return hlen;
 415 }
 416
 417 static int
 418 mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 419 {
 420         struct ieee802154_hdr hdr;
 421         struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;
 422
 423         if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) {
 424                 pr_debug("malformed packet\n");
 425                 return 0;
 426         }
 427
 428         *addr = hdr.source;
 429         return sizeof(*addr);
 430 }
 431
 432 static struct header_ops mac802154_header_ops = {
 433         .create         = mac802154_header_create,
 434         .parse          = mac802154_header_parse,
 435 };
 436
 437 static const struct net_device_ops mac802154_wpan_ops = {
 438         .ndo_open               = mac802154_wpan_open,
 439         .ndo_stop               = mac802154_slave_close,
 440         .ndo_start_xmit         = ieee802154_subif_start_xmit,
 441         .ndo_do_ioctl           = mac802154_wpan_ioctl,
 442         .ndo_set_mac_address    = mac802154_wpan_mac_addr,
 443 };
 444
 445 static const struct net_device_ops mac802154_monitor_ops = {
 446         .ndo_open               = mac802154_wpan_open,
 447         .ndo_stop               = mac802154_slave_close,
 448         .ndo_start_xmit         = ieee802154_monitor_start_xmit,
 449 };
 450
 451 static void mac802154_wpan_free(struct net_device *dev)
 452 {
 453         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 454
 455         mac802154_llsec_destroy(&sdata->sec);
 456
 457         free_netdev(dev);
 458 }
 459
 460 static void ieee802154_if_setup(struct net_device *dev)
 461 {
 462         dev->addr_len           = IEEE802154_EXTENDED_ADDR_LEN;
 463         memset(dev->broadcast, 0xff, IEEE802154_EXTENDED_ADDR_LEN);
 464
 465         dev->hard_header_len    = MAC802154_FRAME_HARD_HEADER_LEN;
 466         dev->needed_tailroom    = 2 + 16; /* FCS + MIC */
 467         dev->mtu                = IEEE802154_MTU;
 468         dev->tx_queue_len       = 300;
 469         dev->flags              = IFF_NOARP | IFF_BROADCAST;
 470 }
 471
 472 static int
 473 ieee802154_setup_sdata(struct ieee802154_sub_if_data *sdata,
 474                        enum nl802154_iftype type)
 475 {
 476         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 477
 478         /* set some type-dependent values */
 479         sdata->vif.type = type;
 480         sdata->wpan_dev.iftype = type;
 481
 482         get_random_bytes(&wpan_dev->bsn, 1);
 483         get_random_bytes(&wpan_dev->dsn, 1);
 484
 485         /* defaults per 802.15.4-2011 */
 486         wpan_dev->min_be = 3;
 487         wpan_dev->max_be = 5;
 488         wpan_dev->csma_retries = 4;
 489         /* for compatibility, actual default is 3 */
 490         wpan_dev->frame_retries = -1;
 491
 492         wpan_dev->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
 493         wpan_dev->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
 494
 495         switch (type) {
 496         case NL802154_IFTYPE_NODE:
 497                 ieee802154_be64_to_le64(&wpan_dev->extended_addr,
 498                                         sdata->dev->dev_addr);
 499
 500                 sdata->dev->header_ops = &mac802154_header_ops;
 501                 sdata->dev->destructor = mac802154_wpan_free;
 502                 sdata->dev->netdev_ops = &mac802154_wpan_ops;
 503                 sdata->dev->ml_priv = &mac802154_mlme_wpan;
 504                 wpan_dev->promiscuous_mode = false;
 505
 506                 spin_lock_init(&sdata->mib_lock);
 507                 mutex_init(&sdata->sec_mtx);
 508
 509                 mac802154_llsec_init(&sdata->sec);
 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                   enum nl802154_iftype type, __le64 extended_addr)
 526 {
 527         struct net_device *ndev = NULL;
 528         struct ieee802154_sub_if_data *sdata = NULL;
 529         int ret = -ENOMEM;
 530
 531         ASSERT_RTNL();
 532
 533         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size, name,
 534                             NET_NAME_UNKNOWN, ieee802154_if_setup);
 535         if (!ndev)
 536                 return ERR_PTR(-ENOMEM);
 537
 538         ndev->needed_headroom = local->hw.extra_tx_headroom;
 539
 540         ret = dev_alloc_name(ndev, ndev->name);
 541         if (ret < 0)
 542                 goto err;
 543
 544         ieee802154_le64_to_be64(ndev->perm_addr,
 545                                 &local->hw.phy->perm_extended_addr);
 546         switch (type) {
 547         case NL802154_IFTYPE_NODE:
 548                 ndev->type = ARPHRD_IEEE802154;
 549                 if (ieee802154_is_valid_extended_addr(extended_addr))
 550                         ieee802154_le64_to_be64(ndev->dev_addr, &extended_addr);
 551                 else
 552                         memcpy(ndev->dev_addr, ndev->perm_addr,
 553                                IEEE802154_EXTENDED_ADDR_LEN);
 554                 break;
 555         case NL802154_IFTYPE_MONITOR:
 556                 ndev->type = ARPHRD_IEEE802154_MONITOR;
 557                 break;
 558         default:
 559                 ret = -EINVAL;
 560                 goto err;
 561         }
 562
 563         /* TODO check this */
 564         SET_NETDEV_DEV(ndev, &local->phy->dev);
 565         sdata = netdev_priv(ndev);
 566         ndev->ieee802154_ptr = &sdata->wpan_dev;
 567         memcpy(sdata->name, ndev->name, IFNAMSIZ);
 568         sdata->dev = ndev;
 569         sdata->wpan_dev.wpan_phy = local->hw.phy;
 570         sdata->local = local;
 571
 572         /* setup type-dependent data */
 573         ret = ieee802154_setup_sdata(sdata, type);
 574         if (ret)
 575                 goto err;
 576
 577         ret = register_netdevice(ndev);
 578         if (ret < 0)
 579                 goto err;
 580
 581         mutex_lock(&local->iflist_mtx);
 582         list_add_tail_rcu(&sdata->list, &local->interfaces);
 583         mutex_unlock(&local->iflist_mtx);
 584
 585         return ndev;
 586
 587 err:
 588         free_netdev(ndev);
 589         return ERR_PTR(ret);
 590 }
 591
 592 void ieee802154_if_remove(struct ieee802154_sub_if_data *sdata)
 593 {
 594         ASSERT_RTNL();
 595
 596         mutex_lock(&sdata->local->iflist_mtx);
 597         list_del_rcu(&sdata->list);
 598         mutex_unlock(&sdata->local->iflist_mtx);
 599
 600         synchronize_rcu();
 601         unregister_netdevice(sdata->dev);
 602 }
 603
 604 void ieee802154_remove_interfaces(struct ieee802154_local *local)
 605 {
 606         struct ieee802154_sub_if_data *sdata, *tmp;
 607
 608         mutex_lock(&local->iflist_mtx);
 609         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 610                 list_del(&sdata->list);
 611
 612                 unregister_netdevice(sdata->dev);
 613         }
 614         mutex_unlock(&local->iflist_mtx);
 615 }
 616
 617 static int netdev_notify(struct notifier_block *nb,
 618                          unsigned long state, void *ptr)
 619 {
 620         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 621         struct ieee802154_sub_if_data *sdata;
 622
 623         if (state != NETDEV_CHANGENAME)
 624                 return NOTIFY_DONE;
 625
 626         if (!dev->ieee802154_ptr || !dev->ieee802154_ptr->wpan_phy)
 627                 return NOTIFY_DONE;
 628
 629         if (dev->ieee802154_ptr->wpan_phy->privid != mac802154_wpan_phy_privid)
 630                 return NOTIFY_DONE;
 631
 632         sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 633         memcpy(sdata->name, dev->name, IFNAMSIZ);
 634
 635         return NOTIFY_OK;
 636 }
 637
 638 static struct notifier_block mac802154_netdev_notifier = {
 639         .notifier_call = netdev_notify,
 640 };
 641
 642 int ieee802154_iface_init(void)
 643 {
 644         return register_netdevice_notifier(&mac802154_netdev_notifier);
 645 }
 646
 647 void ieee802154_iface_exit(void)
 648 {
 649         unregister_netdevice_notifier(&mac802154_netdev_notifier);
 650 }