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                         return -EBUSY;
 179
 180                 if (wpan_dev->short_addr != nwpan_dev->short_addr)
 181                         return -EBUSY;
 182
 183                 if (wpan_dev->extended_addr != nwpan_dev->extended_addr)
 184                         return -EBUSY;
 185         }
 186
 187         if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
 188                 if (wpan_dev->min_be != nwpan_dev->min_be)
 189                         return -EBUSY;
 190
 191                 if (wpan_dev->max_be != nwpan_dev->max_be)
 192                         return -EBUSY;
 193
 194                 if (wpan_dev->csma_retries != nwpan_dev->csma_retries)
 195                         return -EBUSY;
 196         }
 197
 198         if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
 199                 if (wpan_dev->frame_retries != nwpan_dev->frame_retries)
 200                         return -EBUSY;
 201         }
 202
 203         if (local->hw.flags & IEEE802154_HW_LBT) {
 204                 if (wpan_dev->lbt != nwpan_dev->lbt)
 205                         return -EBUSY;
 206         }
 207
 208         return 0;
 209 }
 210
 211 static int
 212 ieee802154_check_concurrent_iface(struct ieee802154_sub_if_data *sdata,
 213                                   enum nl802154_iftype iftype)
 214 {
 215         struct ieee802154_local *local = sdata->local;
 216         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 217         struct ieee802154_sub_if_data *nsdata;
 218
 219         /* we hold the RTNL here so can safely walk the list */
 220         list_for_each_entry(nsdata, &local->interfaces, list) {
 221                 if (nsdata != sdata && ieee802154_sdata_running(nsdata)) {
 222                         int ret;
 223
 224                         /* TODO currently we don't support multiple node types
 225                          * we need to run skb_clone at rx path. Check if there
 226                          * exist really an use case if we need to support
 227                          * multiple node types at the same time.
 228                          */
 229                         if (sdata->vif.type == NL802154_IFTYPE_NODE &&
 230                             nsdata->vif.type == NL802154_IFTYPE_NODE)
 231                                 return -EBUSY;
 232
 233                         /* check all phy mac sublayer settings are the same.
 234                          * We have only one phy, different values makes trouble.
 235                          */
 236                         ret = ieee802154_check_mac_settings(local, wpan_dev,
 237                                                             &nsdata->wpan_dev);
 238                         if (ret < 0)
 239                                 return ret;
 240                 }
 241         }
 242
 243         return 0;
 244 }
 245
 246 static int mac802154_wpan_open(struct net_device *dev)
 247 {
 248         int rc;
 249         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 250         struct ieee802154_local *local = sdata->local;
 251         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 252         struct wpan_phy *phy = sdata->local->phy;
 253
 254         rc = ieee802154_check_concurrent_iface(sdata, sdata->vif.type);
 255         if (rc < 0)
 256                 return rc;
 257
 258         rc = mac802154_slave_open(dev);
 259         if (rc < 0)
 260                 return rc;
 261
 262         mutex_lock(&phy->pib_lock);
 263
 264         if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
 265                 rc = drv_set_promiscuous_mode(local,
 266                                               wpan_dev->promiscuous_mode);
 267                 if (rc < 0)
 268                         goto out;
 269         }
 270
 271         if (local->hw.flags & IEEE802154_HW_AFILT) {
 272                 rc = drv_set_pan_id(local, wpan_dev->pan_id);
 273                 if (rc < 0)
 274                         goto out;
 275
 276                 rc = drv_set_extended_addr(local, wpan_dev->extended_addr);
 277                 if (rc < 0)
 278                         goto out;
 279
 280                 rc = drv_set_short_addr(local, wpan_dev->short_addr);
 281                 if (rc < 0)
 282                         goto out;
 283         }
 284
 285         if (local->hw.flags & IEEE802154_HW_LBT) {
 286                 rc = drv_set_lbt_mode(local, wpan_dev->lbt);
 287                 if (rc < 0)
 288                         goto out;
 289         }
 290
 291         if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
 292                 rc = drv_set_csma_params(local, wpan_dev->min_be,
 293                                          wpan_dev->max_be,
 294                                          wpan_dev->csma_retries);
 295                 if (rc < 0)
 296                         goto out;
 297         }
 298
 299         if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
 300                 rc = drv_set_max_frame_retries(local, wpan_dev->frame_retries);
 301                 if (rc < 0)
 302                         goto out;
 303         }
 304
 305         mutex_unlock(&phy->pib_lock);
 306         return 0;
 307
 308 out:
 309         mutex_unlock(&phy->pib_lock);
 310         return rc;
 311 }
 312
 313 static int mac802154_slave_close(struct net_device *dev)
 314 {
 315         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 316         struct ieee802154_local *local = sdata->local;
 317
 318         ASSERT_RTNL();
 319
 320         hrtimer_cancel(&local->ifs_timer);
 321
 322         netif_stop_queue(dev);
 323         local->open_count--;
 324
 325         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 326
 327         if (!local->open_count)
 328                 drv_stop(local);
 329
 330         return 0;
 331 }
 332
 333 static int mac802154_set_header_security(struct ieee802154_sub_if_data *sdata,
 334                                          struct ieee802154_hdr *hdr,
 335                                          const struct ieee802154_mac_cb *cb)
 336 {
 337         struct ieee802154_llsec_params params;
 338         u8 level;
 339
 340         mac802154_llsec_get_params(&sdata->sec, &params);
 341
 342         if (!params.enabled && cb->secen_override && cb->secen)
 343                 return -EINVAL;
 344         if (!params.enabled ||
 345             (cb->secen_override && !cb->secen) ||
 346             !params.out_level)
 347                 return 0;
 348         if (cb->seclevel_override && !cb->seclevel)
 349                 return -EINVAL;
 350
 351         level = cb->seclevel_override ? cb->seclevel : params.out_level;
 352
 353         hdr->fc.security_enabled = 1;
 354         hdr->sec.level = level;
 355         hdr->sec.key_id_mode = params.out_key.mode;
 356         if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
 357                 hdr->sec.short_src = params.out_key.short_source;
 358         else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
 359                 hdr->sec.extended_src = params.out_key.extended_source;
 360         hdr->sec.key_id = params.out_key.id;
 361
 362         return 0;
 363 }
 364
 365 static int mac802154_header_create(struct sk_buff *skb,
 366                                    struct net_device *dev,
 367                                    unsigned short type,
 368                                    const void *daddr,
 369                                    const void *saddr,
 370                                    unsigned len)
 371 {
 372         struct ieee802154_hdr hdr;
 373         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 374         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 375         struct ieee802154_mac_cb *cb = mac_cb(skb);
 376         int hlen;
 377
 378         if (!daddr)
 379                 return -EINVAL;
 380
 381         memset(&hdr.fc, 0, sizeof(hdr.fc));
 382         hdr.fc.type = cb->type;
 383         hdr.fc.security_enabled = cb->secen;
 384         hdr.fc.ack_request = cb->ackreq;
 385         hdr.seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
 386
 387         if (mac802154_set_header_security(sdata, &hdr, cb) < 0)
 388                 return -EINVAL;
 389
 390         if (!saddr) {
 391                 spin_lock_bh(&sdata->mib_lock);
 392
 393                 if (wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
 394                     wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
 395                     wpan_dev->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
 396                         hdr.source.mode = IEEE802154_ADDR_LONG;
 397                         hdr.source.extended_addr = wpan_dev->extended_addr;
 398                 } else {
 399                         hdr.source.mode = IEEE802154_ADDR_SHORT;
 400                         hdr.source.short_addr = wpan_dev->short_addr;
 401                 }
 402
 403                 hdr.source.pan_id = wpan_dev->pan_id;
 404
 405                 spin_unlock_bh(&sdata->mib_lock);
 406         } else {
 407                 hdr.source = *(const struct ieee802154_addr *)saddr;
 408         }
 409
 410         hdr.dest = *(const struct ieee802154_addr *)daddr;
 411
 412         hlen = ieee802154_hdr_push(skb, &hdr);
 413         if (hlen < 0)
 414                 return -EINVAL;
 415
 416         skb_reset_mac_header(skb);
 417         skb->mac_len = hlen;
 418
 419         if (len > ieee802154_max_payload(&hdr))
 420                 return -EMSGSIZE;
 421
 422         return hlen;
 423 }
 424
 425 static int
 426 mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 427 {
 428         struct ieee802154_hdr hdr;
 429         struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;
 430
 431         if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) {
 432                 pr_debug("malformed packet\n");
 433                 return 0;
 434         }
 435
 436         *addr = hdr.source;
 437         return sizeof(*addr);
 438 }
 439
 440 static struct header_ops mac802154_header_ops = {
 441         .create         = mac802154_header_create,
 442         .parse          = mac802154_header_parse,
 443 };
 444
 445 static const struct net_device_ops mac802154_wpan_ops = {
 446         .ndo_open               = mac802154_wpan_open,
 447         .ndo_stop               = mac802154_slave_close,
 448         .ndo_start_xmit         = ieee802154_subif_start_xmit,
 449         .ndo_do_ioctl           = mac802154_wpan_ioctl,
 450         .ndo_set_mac_address    = mac802154_wpan_mac_addr,
 451 };
 452
 453 static const struct net_device_ops mac802154_monitor_ops = {
 454         .ndo_open               = mac802154_wpan_open,
 455         .ndo_stop               = mac802154_slave_close,
 456         .ndo_start_xmit         = ieee802154_monitor_start_xmit,
 457 };
 458
 459 static void mac802154_wpan_free(struct net_device *dev)
 460 {
 461         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 462
 463         mac802154_llsec_destroy(&sdata->sec);
 464
 465         free_netdev(dev);
 466 }
 467
 468 static void ieee802154_if_setup(struct net_device *dev)
 469 {
 470         dev->addr_len           = IEEE802154_EXTENDED_ADDR_LEN;
 471         memset(dev->broadcast, 0xff, IEEE802154_EXTENDED_ADDR_LEN);
 472
 473         dev->hard_header_len    = MAC802154_FRAME_HARD_HEADER_LEN;
 474         dev->needed_tailroom    = 2 + 16; /* FCS + MIC */
 475         dev->mtu                = IEEE802154_MTU;
 476         dev->tx_queue_len       = 300;
 477         dev->flags              = IFF_NOARP | IFF_BROADCAST;
 478 }
 479
 480 static int
 481 ieee802154_setup_sdata(struct ieee802154_sub_if_data *sdata,
 482                        enum nl802154_iftype type)
 483 {
 484         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 485
 486         /* set some type-dependent values */
 487         sdata->vif.type = type;
 488         sdata->wpan_dev.iftype = type;
 489
 490         get_random_bytes(&wpan_dev->bsn, 1);
 491         get_random_bytes(&wpan_dev->dsn, 1);
 492
 493         /* defaults per 802.15.4-2011 */
 494         wpan_dev->min_be = 3;
 495         wpan_dev->max_be = 5;
 496         wpan_dev->csma_retries = 4;
 497         /* for compatibility, actual default is 3 */
 498         wpan_dev->frame_retries = -1;
 499
 500         wpan_dev->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
 501         wpan_dev->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
 502
 503         switch (type) {
 504         case NL802154_IFTYPE_NODE:
 505                 ieee802154_be64_to_le64(&wpan_dev->extended_addr,
 506                                         sdata->dev->dev_addr);
 507
 508                 sdata->dev->header_ops = &mac802154_header_ops;
 509                 sdata->dev->destructor = mac802154_wpan_free;
 510                 sdata->dev->netdev_ops = &mac802154_wpan_ops;
 511                 sdata->dev->ml_priv = &mac802154_mlme_wpan;
 512                 wpan_dev->promiscuous_mode = false;
 513
 514                 spin_lock_init(&sdata->mib_lock);
 515                 mutex_init(&sdata->sec_mtx);
 516
 517                 mac802154_llsec_init(&sdata->sec);
 518                 break;
 519         case NL802154_IFTYPE_MONITOR:
 520                 sdata->dev->destructor = free_netdev;
 521                 sdata->dev->netdev_ops = &mac802154_monitor_ops;
 522                 wpan_dev->promiscuous_mode = true;
 523                 break;
 524         default:
 525                 BUG();
 526         }
 527
 528         return 0;
 529 }
 530
 531 struct net_device *
 532 ieee802154_if_add(struct ieee802154_local *local, const char *name,
 533                   enum nl802154_iftype type, __le64 extended_addr)
 534 {
 535         struct net_device *ndev = NULL;
 536         struct ieee802154_sub_if_data *sdata = NULL;
 537         int ret = -ENOMEM;
 538
 539         ASSERT_RTNL();
 540
 541         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size, name,
 542                             NET_NAME_UNKNOWN, ieee802154_if_setup);
 543         if (!ndev)
 544                 return ERR_PTR(-ENOMEM);
 545
 546         ndev->needed_headroom = local->hw.extra_tx_headroom;
 547
 548         ret = dev_alloc_name(ndev, ndev->name);
 549         if (ret < 0)
 550                 goto err;
 551
 552         ieee802154_le64_to_be64(ndev->perm_addr,
 553                                 &local->hw.phy->perm_extended_addr);
 554         switch (type) {
 555         case NL802154_IFTYPE_NODE:
 556                 ndev->type = ARPHRD_IEEE802154;
 557                 if (ieee802154_is_valid_extended_addr(extended_addr))
 558                         ieee802154_le64_to_be64(ndev->dev_addr, &extended_addr);
 559                 else
 560                         memcpy(ndev->dev_addr, ndev->perm_addr,
 561                                IEEE802154_EXTENDED_ADDR_LEN);
 562                 break;
 563         case NL802154_IFTYPE_MONITOR:
 564                 ndev->type = ARPHRD_IEEE802154_MONITOR;
 565                 break;
 566         default:
 567                 ret = -EINVAL;
 568                 goto err;
 569         }
 570
 571         /* TODO check this */
 572         SET_NETDEV_DEV(ndev, &local->phy->dev);
 573         sdata = netdev_priv(ndev);
 574         ndev->ieee802154_ptr = &sdata->wpan_dev;
 575         memcpy(sdata->name, ndev->name, IFNAMSIZ);
 576         sdata->dev = ndev;
 577         sdata->wpan_dev.wpan_phy = local->hw.phy;
 578         sdata->local = local;
 579
 580         /* setup type-dependent data */
 581         ret = ieee802154_setup_sdata(sdata, type);
 582         if (ret)
 583                 goto err;
 584
 585         ret = register_netdevice(ndev);
 586         if (ret < 0)
 587                 goto err;
 588
 589         mutex_lock(&local->iflist_mtx);
 590         list_add_tail_rcu(&sdata->list, &local->interfaces);
 591         mutex_unlock(&local->iflist_mtx);
 592
 593         return ndev;
 594
 595 err:
 596         free_netdev(ndev);
 597         return ERR_PTR(ret);
 598 }
 599
 600 void ieee802154_if_remove(struct ieee802154_sub_if_data *sdata)
 601 {
 602         ASSERT_RTNL();
 603
 604         mutex_lock(&sdata->local->iflist_mtx);
 605         list_del_rcu(&sdata->list);
 606         mutex_unlock(&sdata->local->iflist_mtx);
 607
 608         synchronize_rcu();
 609         unregister_netdevice(sdata->dev);
 610 }
 611
 612 void ieee802154_remove_interfaces(struct ieee802154_local *local)
 613 {
 614         struct ieee802154_sub_if_data *sdata, *tmp;
 615
 616         mutex_lock(&local->iflist_mtx);
 617         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 618                 list_del(&sdata->list);
 619
 620                 unregister_netdevice(sdata->dev);
 621         }
 622         mutex_unlock(&local->iflist_mtx);
 623 }
 624
 625 static int netdev_notify(struct notifier_block *nb,
 626                          unsigned long state, void *ptr)
 627 {
 628         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 629         struct ieee802154_sub_if_data *sdata;
 630
 631         if (state != NETDEV_CHANGENAME)
 632                 return NOTIFY_DONE;
 633
 634         if (!dev->ieee802154_ptr || !dev->ieee802154_ptr->wpan_phy)
 635                 return NOTIFY_DONE;
 636
 637         if (dev->ieee802154_ptr->wpan_phy->privid != mac802154_wpan_phy_privid)
 638                 return NOTIFY_DONE;
 639
 640         sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 641         memcpy(sdata->name, dev->name, IFNAMSIZ);
 642
 643         return NOTIFY_OK;
 644 }
 645
 646 static struct notifier_block mac802154_netdev_notifier = {
 647         .notifier_call = netdev_notify,
 648 };
 649
 650 int ieee802154_iface_init(void)
 651 {
 652         return register_netdevice_notifier(&mac802154_netdev_notifier);
 653 }
 654
 655 void ieee802154_iface_exit(void)
 656 {
 657         unregister_netdevice_notifier(&mac802154_netdev_notifier);
 658 }