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         struct ieee802154_mac_cb *cb = mac_cb_init(skb);
  96
  97         /* TODO:
  98          * if this package isn't ipv6 one, where should it be routed?
  99          */
 100         if (type != ETH_P_IPV6)
 101                 return 0;
 102
 103         if (!saddr)
 104                 saddr = dev->dev_addr;
 105
 106         raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
 107         raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
 108
 109         lowpan_header_compress(skb, dev, type, daddr, saddr, len);
 110
 111         /* NOTE1: I'm still unsure about the fact that compression and WPAN
 112          * header are created here and not later in the xmit. So wait for
 113          * an opinion of net maintainers.
 114          */
 115         /* NOTE2: to be absolutely correct, we must derive PANid information
 116          * from MAC subif of the 'dev' and 'real_dev' network devices, but
 117          * this isn't implemented in mainline yet, so currently we assign 0xff
 118          */
 119         cb->type = IEEE802154_FC_TYPE_DATA;
 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
 140         cb->ackreq = !lowpan_is_addr_broadcast(daddr);
 141
 142         return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
 143                         type, (void *)&da, (void *)&sa, 0);
 144 }
 145
 146 static int lowpan_give_skb_to_devices(struct sk_buff *skb,
 147                                         struct net_device *dev)
 148 {
 149         struct lowpan_dev_record *entry;
 150         struct sk_buff *skb_cp;
 151         int stat = NET_RX_SUCCESS;
 152
 153         rcu_read_lock();
 154         list_for_each_entry_rcu(entry, &lowpan_devices, list)
 155                 if (lowpan_dev_info(entry->ldev)->real_dev == skb->dev) {
 156                         skb_cp = skb_copy(skb, GFP_ATOMIC);
 157                         if (!skb_cp) {
 158                                 stat = -ENOMEM;
 159                                 break;
 160                         }
 161
 162                         skb_cp->dev = entry->ldev;
 163                         stat = netif_rx(skb_cp);
 164                 }
 165         rcu_read_unlock();
 166
 167         return stat;
 168 }
 169
 170 static int process_data(struct sk_buff *skb, const struct ieee802154_hdr *hdr)
 171 {
 172         u8 iphc0, iphc1;
 173         struct ieee802154_addr_sa sa, da;
 174         void *sap, *dap;
 175
 176         raw_dump_table(__func__, "raw skb data dump", skb->data, skb->len);
 177         /* at least two bytes will be used for the encoding */
 178         if (skb->len < 2)
 179                 goto drop;
 180
 181         if (lowpan_fetch_skb_u8(skb, &iphc0))
 182                 goto drop;
 183
 184         if (lowpan_fetch_skb_u8(skb, &iphc1))
 185                 goto drop;
 186
 187         ieee802154_addr_to_sa(&sa, &hdr->source);
 188         ieee802154_addr_to_sa(&da, &hdr->dest);
 189
 190         if (sa.addr_type == IEEE802154_ADDR_SHORT)
 191                 sap = &sa.short_addr;
 192         else
 193                 sap = &sa.hwaddr;
 194
 195         if (da.addr_type == IEEE802154_ADDR_SHORT)
 196                 dap = &da.short_addr;
 197         else
 198                 dap = &da.hwaddr;
 199
 200         return lowpan_process_data(skb, skb->dev, sap, sa.addr_type,
 201                                    IEEE802154_ADDR_LEN, dap, da.addr_type,
 202                                    IEEE802154_ADDR_LEN, iphc0, iphc1,
 203                                    lowpan_give_skb_to_devices);
 204
 205 drop:
 206         kfree_skb(skb);
 207         return -EINVAL;
 208 }
 209
 210 static int lowpan_set_address(struct net_device *dev, void *p)
 211 {
 212         struct sockaddr *sa = p;
 213
 214         if (netif_running(dev))
 215                 return -EBUSY;
 216
 217         /* TODO: validate addr */
 218         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 219
 220         return 0;
 221 }
 222
 223 static int
 224 lowpan_fragment_xmit(struct sk_buff *skb, u8 *head,
 225                      int mlen, int plen, int offset, int type)
 226 {
 227         struct sk_buff *frag;
 228         int hlen;
 229
 230         hlen = (type == LOWPAN_DISPATCH_FRAG1) ?
 231                         LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE;
 232
 233         raw_dump_inline(__func__, "6lowpan fragment header", head, hlen);
 234
 235         frag = netdev_alloc_skb(skb->dev,
 236                                 hlen + mlen + plen + IEEE802154_MFR_SIZE);
 237         if (!frag)
 238                 return -ENOMEM;
 239
 240         frag->priority = skb->priority;
 241
 242         /* copy header, MFR and payload */
 243         skb_put(frag, mlen);
 244         skb_copy_to_linear_data(frag, skb_mac_header(skb), mlen);
 245
 246         skb_put(frag, hlen);
 247         skb_copy_to_linear_data_offset(frag, mlen, head, hlen);
 248
 249         skb_put(frag, plen);
 250         skb_copy_to_linear_data_offset(frag, mlen + hlen,
 251                                        skb_network_header(skb) + offset, plen);
 252
 253         raw_dump_table(__func__, " raw fragment dump", frag->data, frag->len);
 254
 255         return dev_queue_xmit(frag);
 256 }
 257
 258 static int
 259 lowpan_skb_fragmentation(struct sk_buff *skb, struct net_device *dev)
 260 {
 261         int err;
 262         u16 dgram_offset, dgram_size, payload_length, header_length,
 263             lowpan_size, frag_plen, offset;
 264         __be16 tag;
 265         u8 head[5];
 266
 267         header_length = skb->mac_len;
 268         payload_length = skb->len - header_length;
 269         tag = lowpan_dev_info(dev)->fragment_tag++;
 270         lowpan_size = skb_network_header_len(skb);
 271         dgram_size = lowpan_uncompress_size(skb, &dgram_offset) -
 272                      header_length;
 273
 274         /* first fragment header */
 275         head[0] = LOWPAN_DISPATCH_FRAG1 | ((dgram_size >> 8) & 0x7);
 276         head[1] = dgram_size & 0xff;
 277         memcpy(head + 2, &tag, sizeof(tag));
 278
 279         /* calc the nearest payload length(divided to 8) for first fragment
 280          * which fits into a IEEE802154_MTU
 281          */
 282         frag_plen = round_down(IEEE802154_MTU - header_length -
 283                                LOWPAN_FRAG1_HEAD_SIZE - lowpan_size -
 284                                IEEE802154_MFR_SIZE, 8);
 285
 286         err = lowpan_fragment_xmit(skb, head, header_length,
 287                                    frag_plen + lowpan_size, 0,
 288                                    LOWPAN_DISPATCH_FRAG1);
 289         if (err) {
 290                 pr_debug("%s unable to send FRAG1 packet (tag: %d)",
 291                          __func__, tag);
 292                 goto exit;
 293         }
 294
 295         offset = lowpan_size + frag_plen;
 296         dgram_offset += frag_plen;
 297
 298         /* next fragment header */
 299         head[0] &= ~LOWPAN_DISPATCH_FRAG1;
 300         head[0] |= LOWPAN_DISPATCH_FRAGN;
 301
 302         frag_plen = round_down(IEEE802154_MTU - header_length -
 303                                LOWPAN_FRAGN_HEAD_SIZE - IEEE802154_MFR_SIZE, 8);
 304
 305         while (payload_length - offset > 0) {
 306                 int len = frag_plen;
 307
 308                 head[4] = dgram_offset >> 3;
 309
 310                 if (payload_length - offset < len)
 311                         len = payload_length - offset;
 312
 313                 err = lowpan_fragment_xmit(skb, head, header_length, len,
 314                                            offset, LOWPAN_DISPATCH_FRAGN);
 315                 if (err) {
 316                         pr_debug("%s unable to send a FRAGN packet. (tag: %d, offset: %d)\n",
 317                                  __func__, tag, offset);
 318                         goto exit;
 319                 }
 320
 321                 offset += len;
 322                 dgram_offset += len;
 323         }
 324
 325 exit:
 326         return err;
 327 }
 328
 329 static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
 330 {
 331         int err = -1;
 332
 333         pr_debug("package xmit\n");
 334
 335         skb->dev = lowpan_dev_info(dev)->real_dev;
 336         if (skb->dev == NULL) {
 337                 pr_debug("ERROR: no real wpan device found\n");
 338                 goto error;
 339         }
 340
 341         /* Send directly if less than the MTU minus the 2 checksum bytes. */
 342         if (skb->len <= IEEE802154_MTU - IEEE802154_MFR_SIZE) {
 343                 err = dev_queue_xmit(skb);
 344                 goto out;
 345         }
 346
 347         pr_debug("frame is too big, fragmentation is needed\n");
 348         err = lowpan_skb_fragmentation(skb, dev);
 349 error:
 350         dev_kfree_skb(skb);
 351 out:
 352         if (err)
 353                 pr_debug("ERROR: xmit failed\n");
 354
 355         return (err < 0) ? NET_XMIT_DROP : err;
 356 }
 357
 358 static struct wpan_phy *lowpan_get_phy(const struct net_device *dev)
 359 {
 360         struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
 361         return ieee802154_mlme_ops(real_dev)->get_phy(real_dev);
 362 }
 363
 364 static __le16 lowpan_get_pan_id(const struct net_device *dev)
 365 {
 366         struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
 367         return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev);
 368 }
 369
 370 static __le16 lowpan_get_short_addr(const struct net_device *dev)
 371 {
 372         struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
 373         return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev);
 374 }
 375
 376 static u8 lowpan_get_dsn(const struct net_device *dev)
 377 {
 378         struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
 379         return ieee802154_mlme_ops(real_dev)->get_dsn(real_dev);
 380 }
 381
 382 static struct header_ops lowpan_header_ops = {
 383         .create = lowpan_header_create,
 384 };
 385
 386 static struct lock_class_key lowpan_tx_busylock;
 387 static struct lock_class_key lowpan_netdev_xmit_lock_key;
 388
 389 static void lowpan_set_lockdep_class_one(struct net_device *dev,
 390                                          struct netdev_queue *txq,
 391                                          void *_unused)
 392 {
 393         lockdep_set_class(&txq->_xmit_lock,
 394                           &lowpan_netdev_xmit_lock_key);
 395 }
 396
 397
 398 static int lowpan_dev_init(struct net_device *dev)
 399 {
 400         netdev_for_each_tx_queue(dev, lowpan_set_lockdep_class_one, NULL);
 401         dev->qdisc_tx_busylock = &lowpan_tx_busylock;
 402         return 0;
 403 }
 404
 405 static const struct net_device_ops lowpan_netdev_ops = {
 406         .ndo_init               = lowpan_dev_init,
 407         .ndo_start_xmit         = lowpan_xmit,
 408         .ndo_set_mac_address    = lowpan_set_address,
 409 };
 410
 411 static struct ieee802154_mlme_ops lowpan_mlme = {
 412         .get_pan_id = lowpan_get_pan_id,
 413         .get_phy = lowpan_get_phy,
 414         .get_short_addr = lowpan_get_short_addr,
 415         .get_dsn = lowpan_get_dsn,
 416 };
 417
 418 static void lowpan_setup(struct net_device *dev)
 419 {
 420         dev->addr_len           = IEEE802154_ADDR_LEN;
 421         memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
 422         dev->type               = ARPHRD_IEEE802154;
 423         /* Frame Control + Sequence Number + Address fields + Security Header */
 424         dev->hard_header_len    = 2 + 1 + 20 + 14;
 425         dev->needed_tailroom    = 2; /* FCS */
 426         dev->mtu                = 1281;
 427         dev->tx_queue_len       = 0;
 428         dev->flags              = IFF_BROADCAST | IFF_MULTICAST;
 429         dev->watchdog_timeo     = 0;
 430
 431         dev->netdev_ops         = &lowpan_netdev_ops;
 432         dev->header_ops         = &lowpan_header_ops;
 433         dev->ml_priv            = &lowpan_mlme;
 434         dev->destructor         = free_netdev;
 435 }
 436
 437 static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
 438 {
 439         if (tb[IFLA_ADDRESS]) {
 440                 if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
 441                         return -EINVAL;
 442         }
 443         return 0;
 444 }
 445
 446 static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
 447         struct packet_type *pt, struct net_device *orig_dev)
 448 {
 449         struct ieee802154_hdr hdr;
 450         int ret;
 451
 452         skb = skb_share_check(skb, GFP_ATOMIC);
 453         if (!skb)
 454                 goto drop;
 455
 456         if (!netif_running(dev))
 457                 goto drop_skb;
 458
 459         if (dev->type != ARPHRD_IEEE802154)
 460                 goto drop_skb;
 461
 462         if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0)
 463                 goto drop_skb;
 464
 465         /* check that it's our buffer */
 466         if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
 467                 skb->protocol = htons(ETH_P_IPV6);
 468                 skb->pkt_type = PACKET_HOST;
 469
 470                 /* Pull off the 1-byte of 6lowpan header. */
 471                 skb_pull(skb, 1);
 472
 473                 ret = lowpan_give_skb_to_devices(skb, NULL);
 474                 if (ret == NET_RX_DROP)
 475                         goto drop;
 476         } else {
 477                 switch (skb->data[0] & 0xe0) {
 478                 case LOWPAN_DISPATCH_IPHC:      /* ipv6 datagram */
 479                         ret = process_data(skb, &hdr);
 480                         if (ret == NET_RX_DROP)
 481                                 goto drop;
 482                         break;
 483                 case LOWPAN_DISPATCH_FRAG1:     /* first fragment header */
 484                         ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAG1);
 485                         if (ret == 1) {
 486                                 ret = process_data(skb, &hdr);
 487                                 if (ret == NET_RX_DROP)
 488                                         goto drop;
 489                         }
 490                         break;
 491                 case LOWPAN_DISPATCH_FRAGN:     /* next fragments headers */
 492                         ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAGN);
 493                         if (ret == 1) {
 494                                 ret = process_data(skb, &hdr);
 495                                 if (ret == NET_RX_DROP)
 496                                         goto drop;
 497                         }
 498                         break;
 499                 default:
 500                         break;
 501                 }
 502         }
 503
 504         return NET_RX_SUCCESS;
 505 drop_skb:
 506         kfree_skb(skb);
 507 drop:
 508         return NET_RX_DROP;
 509 }
 510
 511 static int lowpan_newlink(struct net *src_net, struct net_device *dev,
 512                           struct nlattr *tb[], struct nlattr *data[])
 513 {
 514         struct net_device *real_dev;
 515         struct lowpan_dev_record *entry;
 516
 517         pr_debug("adding new link\n");
 518
 519         if (!tb[IFLA_LINK])
 520                 return -EINVAL;
 521         /* find and hold real wpan device */
 522         real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 523         if (!real_dev)
 524                 return -ENODEV;
 525         if (real_dev->type != ARPHRD_IEEE802154) {
 526                 dev_put(real_dev);
 527                 return -EINVAL;
 528         }
 529
 530         lowpan_dev_info(dev)->real_dev = real_dev;
 531         mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
 532
 533         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
 534         if (!entry) {
 535                 dev_put(real_dev);
 536                 lowpan_dev_info(dev)->real_dev = NULL;
 537                 return -ENOMEM;
 538         }
 539
 540         entry->ldev = dev;
 541
 542         /* Set the lowpan harware address to the wpan hardware address. */
 543         memcpy(dev->dev_addr, real_dev->dev_addr, IEEE802154_ADDR_LEN);
 544
 545         mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
 546         INIT_LIST_HEAD(&entry->list);
 547         list_add_tail(&entry->list, &lowpan_devices);
 548         mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
 549
 550         register_netdevice(dev);
 551
 552         return 0;
 553 }
 554
 555 static void lowpan_dellink(struct net_device *dev, struct list_head *head)
 556 {
 557         struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
 558         struct net_device *real_dev = lowpan_dev->real_dev;
 559         struct lowpan_dev_record *entry, *tmp;
 560
 561         ASSERT_RTNL();
 562
 563         mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
 564         list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
 565                 if (entry->ldev == dev) {
 566                         list_del(&entry->list);
 567                         kfree(entry);
 568                 }
 569         }
 570         mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
 571
 572         mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);
 573
 574         unregister_netdevice_queue(dev, head);
 575
 576         dev_put(real_dev);
 577 }
 578
 579 static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
 580         .kind           = "lowpan",
 581         .priv_size      = sizeof(struct lowpan_dev_info),
 582         .setup          = lowpan_setup,
 583         .newlink        = lowpan_newlink,
 584         .dellink        = lowpan_dellink,
 585         .validate       = lowpan_validate,
 586 };
 587
 588 static inline int __init lowpan_netlink_init(void)
 589 {
 590         return rtnl_link_register(&lowpan_link_ops);
 591 }
 592
 593 static inline void lowpan_netlink_fini(void)
 594 {
 595         rtnl_link_unregister(&lowpan_link_ops);
 596 }
 597
 598 static int lowpan_device_event(struct notifier_block *unused,
 599                                unsigned long event, void *ptr)
 600 {
 601         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 602         LIST_HEAD(del_list);
 603         struct lowpan_dev_record *entry, *tmp;
 604
 605         if (dev->type != ARPHRD_IEEE802154)
 606                 goto out;
 607
 608         if (event == NETDEV_UNREGISTER) {
 609                 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
 610                         if (lowpan_dev_info(entry->ldev)->real_dev == dev)
 611                                 lowpan_dellink(entry->ldev, &del_list);
 612                 }
 613
 614                 unregister_netdevice_many(&del_list);
 615         }
 616
 617 out:
 618         return NOTIFY_DONE;
 619 }
 620
 621 static struct notifier_block lowpan_dev_notifier = {
 622         .notifier_call = lowpan_device_event,
 623 };
 624
 625 static struct packet_type lowpan_packet_type = {
 626         .type = htons(ETH_P_IEEE802154),
 627         .func = lowpan_rcv,
 628 };
 629
 630 static int __init lowpan_init_module(void)
 631 {
 632         int err = 0;
 633
 634         err = lowpan_net_frag_init();
 635         if (err < 0)
 636                 goto out;
 637
 638         err = lowpan_netlink_init();
 639         if (err < 0)
 640                 goto out_frag;
 641
 642         dev_add_pack(&lowpan_packet_type);
 643
 644         err = register_netdevice_notifier(&lowpan_dev_notifier);
 645         if (err < 0)
 646                 goto out_pack;
 647
 648         return 0;
 649
 650 out_pack:
 651         dev_remove_pack(&lowpan_packet_type);
 652         lowpan_netlink_fini();
 653 out_frag:
 654         lowpan_net_frag_exit();
 655 out:
 656         return err;
 657 }
 658
 659 static void __exit lowpan_cleanup_module(void)
 660 {
 661         lowpan_netlink_fini();
 662
 663         dev_remove_pack(&lowpan_packet_type);
 664
 665         lowpan_net_frag_exit();
 666
 667         unregister_netdevice_notifier(&lowpan_dev_notifier);
 668 }
 669
 670 module_init(lowpan_init_module);
 671 module_exit(lowpan_cleanup_module);
 672 MODULE_LICENSE("GPL");
 673 MODULE_ALIAS_RTNL_LINK("lowpan");