net/ieee802154/6lowpan_rtnl.c

   1 /* Copyright 2011, Siemens AG
   2  * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
   3  */
   4
   5 /* Based on patches from Jon Smirl <jonsmirl@gmail.com>
   6  * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 /* Jon's code is based on 6lowpan implementation for Contiki which is:
  19  * Copyright (c) 2008, Swedish Institute of Computer Science.
  20  * All rights reserved.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the above copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. Neither the name of the Institute nor the names of its contributors
  31  *    may be used to endorse or promote products derived from this software
  32  *    without specific prior written permission.
  33  *
  34  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  35  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  36  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  37  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  38  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  39  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  40  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  41  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  42  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  43  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  44  * SUCH DAMAGE.
  45  */
  46
  47 #include <linux/bitops.h>
  48 #include <linux/if_arp.h>
  49 #include <linux/module.h>
  50 #include <linux/moduleparam.h>
  51 #include <linux/netdevice.h>
  52 #include <net/af_ieee802154.h>
  53 #include <net/ieee802154.h>
  54 #include <net/ieee802154_netdev.h>
  55 #include <net/6lowpan.h>
  56 #include <net/ipv6.h>
  57
  58 #include "reassembly.h"
  59
  60 static LIST_HEAD(lowpan_devices);
  61
  62 /* private device info */
  63 struct lowpan_dev_info {
  64         struct net_device       *real_dev; /* real WPAN device ptr */
  65         struct mutex            dev_list_mtx; /* mutex for list ops */
  66         __be16                  fragment_tag;
  67 };
  68
  69 struct lowpan_dev_record {
  70         struct net_device *ldev;
  71         struct list_head list;
  72 };
  73
  74 static inline struct
  75 lowpan_dev_info *lowpan_dev_info(const struct net_device *dev)
  76 {
  77         return netdev_priv(dev);
  78 }
  79
  80 static inline void lowpan_address_flip(u8 *src, u8 *dest)
  81 {
  82         int i;
  83         for (i = 0; i < IEEE802154_ADDR_LEN; i++)
  84                 (dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i];
  85 }
  86
  87 static int lowpan_header_create(struct sk_buff *skb,
  88                            struct net_device *dev,
  89                            unsigned short type, const void *_daddr,
  90                            const void *_saddr, unsigned int len)
  91 {
  92         const u8 *saddr = _saddr;
  93         const u8 *daddr = _daddr;
  94         struct ieee802154_addr sa, da;
  95
  96         /* TODO:
  97          * if this package isn't ipv6 one, where should it be routed?
  98          */
  99         if (type != ETH_P_IPV6)
 100                 return 0;
 101
 102         if (!saddr)
 103                 saddr = dev->dev_addr;
 104
 105         raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
 106         raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
 107
 108         lowpan_header_compress(skb, dev, type, daddr, saddr, len);
 109
 110         /* NOTE1: I'm still unsure about the fact that compression and WPAN
 111          * header are created here and not later in the xmit. So wait for
 112          * an opinion of net maintainers.
 113          */
 114         /* NOTE2: to be absolutely correct, we must derive PANid information
 115          * from MAC subif of the 'dev' and 'real_dev' network devices, but
 116          * this isn't implemented in mainline yet, so currently we assign 0xff
 117          */
 118         mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
 119         mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
 120
 121         /* prepare wpan address data */
 122         sa.mode = IEEE802154_ADDR_LONG;
 123         sa.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
 124         sa.extended_addr = ieee802154_devaddr_from_raw(saddr);
 125
 126         /* intra-PAN communications */
 127         da.pan_id = sa.pan_id;
 128
 129         /* if the destination address is the broadcast address, use the
 130          * corresponding short address
 131          */
 132         if (lowpan_is_addr_broadcast(daddr)) {
 133                 da.mode = IEEE802154_ADDR_SHORT;
 134                 da.short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
 135         } else {
 136                 da.mode = IEEE802154_ADDR_LONG;
 137                 da.extended_addr = ieee802154_devaddr_from_raw(daddr);
 138
 139                 /* request acknowledgment */
 140                 mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ;
 141         }
 142
 143         return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
 144                         type, (void *)&da, (void *)&sa, 0);
 145 }
 146
 147 static int lowpan_give_skb_to_devices(struct sk_buff *skb,
 148                                         struct net_device *dev)
 149 {
 150         struct lowpan_dev_record *entry;
 151         struct sk_buff *skb_cp;
 152         int stat = NET_RX_SUCCESS;
 153
 154         rcu_read_lock();
 155         list_for_each_entry_rcu(entry, &lowpan_devices, list)
 156                 if (lowpan_dev_info(entry->ldev)->real_dev == skb->dev) {
 157                         skb_cp = skb_copy(skb, GFP_ATOMIC);
 158                         if (!skb_cp) {
 159                                 stat = -ENOMEM;
 160                                 break;
 161                         }
 162
 163                         skb_cp->dev = entry->ldev;
 164                         stat = netif_rx(skb_cp);
 165                 }
 166         rcu_read_unlock();
 167
 168         return stat;
 169 }
 170
 171 static int process_data(struct sk_buff *skb, const struct ieee802154_hdr *hdr)
 172 {
 173         u8 iphc0, iphc1;
 174         struct ieee802154_addr_sa sa, da;
 175         void *sap, *dap;
 176
 177         raw_dump_table(__func__, "raw skb data dump", skb->data, skb->len);
 178         /* at least two bytes will be used for the encoding */
 179         if (skb->len < 2)
 180                 goto drop;
 181
 182         if (lowpan_fetch_skb_u8(skb, &iphc0))
 183                 goto drop;
 184
 185         if (lowpan_fetch_skb_u8(skb, &iphc1))
 186                 goto drop;
 187
 188         ieee802154_addr_to_sa(&sa, &hdr->source);
 189         ieee802154_addr_to_sa(&da, &hdr->dest);
 190
 191         if (sa.addr_type == IEEE802154_ADDR_SHORT)
 192                 sap = &sa.short_addr;
 193         else
 194                 sap = &sa.hwaddr;
 195
 196         if (da.addr_type == IEEE802154_ADDR_SHORT)
 197                 dap = &da.short_addr;
 198         else
 199                 dap = &da.hwaddr;
 200
 201         return lowpan_process_data(skb, skb->dev, sap, sa.addr_type,
 202                                    IEEE802154_ADDR_LEN, dap, da.addr_type,
 203                                    IEEE802154_ADDR_LEN, iphc0, iphc1,
 204                                    lowpan_give_skb_to_devices);
 205
 206 drop:
 207         kfree_skb(skb);
 208         return -EINVAL;
 209 }
 210
 211 static int lowpan_set_address(struct net_device *dev, void *p)
 212 {
 213         struct sockaddr *sa = p;
 214
 215         if (netif_running(dev))
 216                 return -EBUSY;
 217
 218         /* TODO: validate addr */
 219         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 220
 221         return 0;
 222 }
 223
 224 static int
 225 lowpan_fragment_xmit(struct sk_buff *skb, u8 *head,
 226                      int mlen, int plen, int offset, int type)
 227 {
 228         struct sk_buff *frag;
 229         int hlen;
 230
 231         hlen = (type == LOWPAN_DISPATCH_FRAG1) ?
 232                         LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE;
 233
 234         raw_dump_inline(__func__, "6lowpan fragment header", head, hlen);
 235
 236         frag = netdev_alloc_skb(skb->dev,
 237                                 hlen + mlen + plen + IEEE802154_MFR_SIZE);
 238         if (!frag)
 239                 return -ENOMEM;
 240
 241         frag->priority = skb->priority;
 242
 243         /* copy header, MFR and payload */
 244         skb_put(frag, mlen);
 245         skb_copy_to_linear_data(frag, skb_mac_header(skb), mlen);
 246
 247         skb_put(frag, hlen);
 248         skb_copy_to_linear_data_offset(frag, mlen, head, hlen);
 249
 250         skb_put(frag, plen);
 251         skb_copy_to_linear_data_offset(frag, mlen + hlen,
 252                                        skb_network_header(skb) + offset, plen);
 253
 254         raw_dump_table(__func__, " raw fragment dump", frag->data, frag->len);
 255
 256         return dev_queue_xmit(frag);
 257 }
 258
 259 static int
 260 lowpan_skb_fragmentation(struct sk_buff *skb, struct net_device *dev)
 261 {
 262         int err;
 263         u16 dgram_offset, dgram_size, payload_length, header_length,
 264             lowpan_size, frag_plen, offset;
 265         __be16 tag;
 266         u8 head[5];
 267
 268         header_length = skb->mac_len;
 269         payload_length = skb->len - header_length;
 270         tag = lowpan_dev_info(dev)->fragment_tag++;
 271         lowpan_size = skb_network_header_len(skb);
 272         dgram_size = lowpan_uncompress_size(skb, &dgram_offset) -
 273                      header_length;
 274
 275         /* first fragment header */
 276         head[0] = LOWPAN_DISPATCH_FRAG1 | ((dgram_size >> 8) & 0x7);
 277         head[1] = dgram_size & 0xff;
 278         memcpy(head + 2, &tag, sizeof(tag));
 279
 280         /* calc the nearest payload length(divided to 8) for first fragment
 281          * which fits into a IEEE802154_MTU
 282          */
 283         frag_plen = round_down(IEEE802154_MTU - header_length -
 284                                LOWPAN_FRAG1_HEAD_SIZE - lowpan_size -
 285                                IEEE802154_MFR_SIZE, 8);
 286
 287         err = lowpan_fragment_xmit(skb, head, header_length,
 288                                    frag_plen + lowpan_size, 0,
 289                                    LOWPAN_DISPATCH_FRAG1);
 290         if (err) {
 291                 pr_debug("%s unable to send FRAG1 packet (tag: %d)",
 292                          __func__, tag);
 293                 goto exit;
 294         }
 295
 296         offset = lowpan_size + frag_plen;
 297         dgram_offset += frag_plen;
 298
 299         /* next fragment header */
 300         head[0] &= ~LOWPAN_DISPATCH_FRAG1;
 301         head[0] |= LOWPAN_DISPATCH_FRAGN;
 302
 303         frag_plen = round_down(IEEE802154_MTU - header_length -
 304                                LOWPAN_FRAGN_HEAD_SIZE - IEEE802154_MFR_SIZE, 8);
 305
 306         while (payload_length - offset > 0) {
 307                 int len = frag_plen;
 308
 309                 head[4] = dgram_offset >> 3;
 310
 311                 if (payload_length - offset < len)
 312                         len = payload_length - offset;
 313
 314                 err = lowpan_fragment_xmit(skb, head, header_length, len,
 315                                            offset, LOWPAN_DISPATCH_FRAGN);
 316                 if (err) {
 317                         pr_debug("%s unable to send a FRAGN packet. (tag: %d, offset: %d)\n",
 318                                  __func__, tag, offset);
 319                         goto exit;
 320                 }
 321
 322                 offset += len;
 323                 dgram_offset += len;
 324         }
 325
 326 exit:
 327         return err;
 328 }
 329
 330 static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
 331 {
 332         int err = -1;
 333
 334         pr_debug("package xmit\n");
 335
 336         skb->dev = lowpan_dev_info(dev)->real_dev;
 337         if (skb->dev == NULL) {
 338                 pr_debug("ERROR: no real wpan device found\n");
 339                 goto error;
 340         }
 341
 342         /* Send directly if less than the MTU minus the 2 checksum bytes. */
 343         if (skb->len <= IEEE802154_MTU - IEEE802154_MFR_SIZE) {
 344                 err = dev_queue_xmit(skb);
 345                 goto out;
 346         }
 347
 348         pr_debug("frame is too big, fragmentation is needed\n");
 349         err = lowpan_skb_fragmentation(skb, dev);
 350 error:
 351         dev_kfree_skb(skb);
 352 out:
 353         if (err)
 354                 pr_debug("ERROR: xmit failed\n");
 355
 356         return (err < 0) ? NET_XMIT_DROP : err;
 357 }
 358
 359 static struct wpan_phy *lowpan_get_phy(const struct net_device *dev)
 360 {
 361         struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
 362         return ieee802154_mlme_ops(real_dev)->get_phy(real_dev);
 363 }
 364
 365 static __le16 lowpan_get_pan_id(const struct net_device *dev)
 366 {
 367         struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
 368         return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev);
 369 }
 370
 371 static __le16 lowpan_get_short_addr(const struct net_device *dev)
 372 {
 373         struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
 374         return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev);
 375 }
 376
 377 static u8 lowpan_get_dsn(const struct net_device *dev)
 378 {
 379         struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
 380         return ieee802154_mlme_ops(real_dev)->get_dsn(real_dev);
 381 }
 382
 383 static struct header_ops lowpan_header_ops = {
 384         .create = lowpan_header_create,
 385 };
 386
 387 static struct lock_class_key lowpan_tx_busylock;
 388 static struct lock_class_key lowpan_netdev_xmit_lock_key;
 389
 390 static void lowpan_set_lockdep_class_one(struct net_device *dev,
 391                                          struct netdev_queue *txq,
 392                                          void *_unused)
 393 {
 394         lockdep_set_class(&txq->_xmit_lock,
 395                           &lowpan_netdev_xmit_lock_key);
 396 }
 397
 398
 399 static int lowpan_dev_init(struct net_device *dev)
 400 {
 401         netdev_for_each_tx_queue(dev, lowpan_set_lockdep_class_one, NULL);
 402         dev->qdisc_tx_busylock = &lowpan_tx_busylock;
 403         return 0;
 404 }
 405
 406 static const struct net_device_ops lowpan_netdev_ops = {
 407         .ndo_init               = lowpan_dev_init,
 408         .ndo_start_xmit         = lowpan_xmit,
 409         .ndo_set_mac_address    = lowpan_set_address,
 410 };
 411
 412 static struct ieee802154_mlme_ops lowpan_mlme = {
 413         .get_pan_id = lowpan_get_pan_id,
 414         .get_phy = lowpan_get_phy,
 415         .get_short_addr = lowpan_get_short_addr,
 416         .get_dsn = lowpan_get_dsn,
 417 };
 418
 419 static void lowpan_setup(struct net_device *dev)
 420 {
 421         dev->addr_len           = IEEE802154_ADDR_LEN;
 422         memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
 423         dev->type               = ARPHRD_IEEE802154;
 424         /* Frame Control + Sequence Number + Address fields + Security Header */
 425         dev->hard_header_len    = 2 + 1 + 20 + 14;
 426         dev->needed_tailroom    = 2; /* FCS */
 427         dev->mtu                = 1281;
 428         dev->tx_queue_len       = 0;
 429         dev->flags              = IFF_BROADCAST | IFF_MULTICAST;
 430         dev->watchdog_timeo     = 0;
 431
 432         dev->netdev_ops         = &lowpan_netdev_ops;
 433         dev->header_ops         = &lowpan_header_ops;
 434         dev->ml_priv            = &lowpan_mlme;
 435         dev->destructor         = free_netdev;
 436 }
 437
 438 static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
 439 {
 440         if (tb[IFLA_ADDRESS]) {
 441                 if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
 442                         return -EINVAL;
 443         }
 444         return 0;
 445 }
 446
 447 static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
 448         struct packet_type *pt, struct net_device *orig_dev)
 449 {
 450         struct ieee802154_hdr hdr;
 451         int ret;
 452
 453         skb = skb_share_check(skb, GFP_ATOMIC);
 454         if (!skb)
 455                 goto drop;
 456
 457         if (!netif_running(dev))
 458                 goto drop_skb;
 459
 460         if (dev->type != ARPHRD_IEEE802154)
 461                 goto drop_skb;
 462
 463         if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0)
 464                 goto drop_skb;
 465
 466         /* check that it's our buffer */
 467         if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
 468                 skb->protocol = htons(ETH_P_IPV6);
 469                 skb->pkt_type = PACKET_HOST;
 470
 471                 /* Pull off the 1-byte of 6lowpan header. */
 472                 skb_pull(skb, 1);
 473
 474                 ret = lowpan_give_skb_to_devices(skb, NULL);
 475                 if (ret == NET_RX_DROP)
 476                         goto drop;
 477         } else {
 478                 switch (skb->data[0] & 0xe0) {
 479                 case LOWPAN_DISPATCH_IPHC:      /* ipv6 datagram */
 480                         ret = process_data(skb, &hdr);
 481                         if (ret == NET_RX_DROP)
 482                                 goto drop;
 483                         break;
 484                 case LOWPAN_DISPATCH_FRAG1:     /* first fragment header */
 485                         ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAG1);
 486                         if (ret == 1) {
 487                                 ret = process_data(skb, &hdr);
 488                                 if (ret == NET_RX_DROP)
 489                                         goto drop;
 490                         }
 491                         break;
 492                 case LOWPAN_DISPATCH_FRAGN:     /* next fragments headers */
 493                         ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAGN);
 494                         if (ret == 1) {
 495                                 ret = process_data(skb, &hdr);
 496                                 if (ret == NET_RX_DROP)
 497                                         goto drop;
 498                         }
 499                         break;
 500                 default:
 501                         break;
 502                 }
 503         }
 504
 505         return NET_RX_SUCCESS;
 506 drop_skb:
 507         kfree_skb(skb);
 508 drop:
 509         return NET_RX_DROP;
 510 }
 511
 512 static int lowpan_newlink(struct net *src_net, struct net_device *dev,
 513                           struct nlattr *tb[], struct nlattr *data[])
 514 {
 515         struct net_device *real_dev;
 516         struct lowpan_dev_record *entry;
 517
 518         pr_debug("adding new link\n");
 519
 520         if (!tb[IFLA_LINK])
 521                 return -EINVAL;
 522         /* find and hold real wpan device */
 523         real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 524         if (!real_dev)
 525                 return -ENODEV;
 526         if (real_dev->type != ARPHRD_IEEE802154) {
 527                 dev_put(real_dev);
 528                 return -EINVAL;
 529         }
 530
 531         lowpan_dev_info(dev)->real_dev = real_dev;
 532         mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
 533
 534         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
 535         if (!entry) {
 536                 dev_put(real_dev);
 537                 lowpan_dev_info(dev)->real_dev = NULL;
 538                 return -ENOMEM;
 539         }
 540
 541         entry->ldev = dev;
 542
 543         /* Set the lowpan harware address to the wpan hardware address. */
 544         memcpy(dev->dev_addr, real_dev->dev_addr, IEEE802154_ADDR_LEN);
 545
 546         mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
 547         INIT_LIST_HEAD(&entry->list);
 548         list_add_tail(&entry->list, &lowpan_devices);
 549         mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
 550
 551         register_netdevice(dev);
 552
 553         return 0;
 554 }
 555
 556 static void lowpan_dellink(struct net_device *dev, struct list_head *head)
 557 {
 558         struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
 559         struct net_device *real_dev = lowpan_dev->real_dev;
 560         struct lowpan_dev_record *entry, *tmp;
 561
 562         ASSERT_RTNL();
 563
 564         mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
 565         list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
 566                 if (entry->ldev == dev) {
 567                         list_del(&entry->list);
 568                         kfree(entry);
 569                 }
 570         }
 571         mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
 572
 573         mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);
 574
 575         unregister_netdevice_queue(dev, head);
 576
 577         dev_put(real_dev);
 578 }
 579
 580 static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
 581         .kind           = "lowpan",
 582         .priv_size      = sizeof(struct lowpan_dev_info),
 583         .setup          = lowpan_setup,
 584         .newlink        = lowpan_newlink,
 585         .dellink        = lowpan_dellink,
 586         .validate       = lowpan_validate,
 587 };
 588
 589 static inline int __init lowpan_netlink_init(void)
 590 {
 591         return rtnl_link_register(&lowpan_link_ops);
 592 }
 593
 594 static inline void lowpan_netlink_fini(void)
 595 {
 596         rtnl_link_unregister(&lowpan_link_ops);
 597 }
 598
 599 static int lowpan_device_event(struct notifier_block *unused,
 600                                unsigned long event, void *ptr)
 601 {
 602         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 603         LIST_HEAD(del_list);
 604         struct lowpan_dev_record *entry, *tmp;
 605
 606         if (dev->type != ARPHRD_IEEE802154)
 607                 goto out;
 608
 609         if (event == NETDEV_UNREGISTER) {
 610                 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
 611                         if (lowpan_dev_info(entry->ldev)->real_dev == dev)
 612                                 lowpan_dellink(entry->ldev, &del_list);
 613                 }
 614
 615                 unregister_netdevice_many(&del_list);
 616         }
 617
 618 out:
 619         return NOTIFY_DONE;
 620 }
 621
 622 static struct notifier_block lowpan_dev_notifier = {
 623         .notifier_call = lowpan_device_event,
 624 };
 625
 626 static struct packet_type lowpan_packet_type = {
 627         .type = htons(ETH_P_IEEE802154),
 628         .func = lowpan_rcv,
 629 };
 630
 631 static int __init lowpan_init_module(void)
 632 {
 633         int err = 0;
 634
 635         err = lowpan_net_frag_init();
 636         if (err < 0)
 637                 goto out;
 638
 639         err = lowpan_netlink_init();
 640         if (err < 0)
 641                 goto out_frag;
 642
 643         dev_add_pack(&lowpan_packet_type);
 644
 645         err = register_netdevice_notifier(&lowpan_dev_notifier);
 646         if (err < 0)
 647                 goto out_pack;
 648
 649         return 0;
 650
 651 out_pack:
 652         dev_remove_pack(&lowpan_packet_type);
 653         lowpan_netlink_fini();
 654 out_frag:
 655         lowpan_net_frag_exit();
 656 out:
 657         return err;
 658 }
 659
 660 static void __exit lowpan_cleanup_module(void)
 661 {
 662         lowpan_netlink_fini();
 663
 664         dev_remove_pack(&lowpan_packet_type);
 665
 666         lowpan_net_frag_exit();
 667
 668         unregister_netdevice_notifier(&lowpan_dev_notifier);
 669 }
 670
 671 module_init(lowpan_init_module);
 672 module_exit(lowpan_cleanup_module);
 673 MODULE_LICENSE("GPL");
 674 MODULE_ALIAS_RTNL_LINK("lowpan");