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/ipv6.h>
  56
  57 #include "reassembly.h"
  58 #include "6lowpan.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.addr_type = IEEE802154_ADDR_LONG;
 123         sa.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
 124
 125         memcpy(&(sa.hwaddr), saddr, 8);
 126         /* intra-PAN communications */
 127         da.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
 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.addr_type = IEEE802154_ADDR_SHORT;
 134                 da.short_addr = IEEE802154_ADDR_BROADCAST;
 135         } else {
 136                 da.addr_type = IEEE802154_ADDR_LONG;
 137                 memcpy(&(da.hwaddr), daddr, IEEE802154_ADDR_LEN);
 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, skb->len);
 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)
 172 {
 173         u8 iphc0, iphc1;
 174         const struct ieee802154_addr *_saddr, *_daddr;
 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         _saddr = &mac_cb(skb)->sa;
 188         _daddr = &mac_cb(skb)->da;
 189
 190         return lowpan_process_data(skb, skb->dev, (u8 *)_saddr->hwaddr,
 191                                 _saddr->addr_type, IEEE802154_ADDR_LEN,
 192                                 (u8 *)_daddr->hwaddr, _daddr->addr_type,
 193                                 IEEE802154_ADDR_LEN, iphc0, iphc1,
 194                                 lowpan_give_skb_to_devices);
 195
 196 drop:
 197         kfree_skb(skb);
 198         return -EINVAL;
 199 }
 200
 201 static int lowpan_set_address(struct net_device *dev, void *p)
 202 {
 203         struct sockaddr *sa = p;
 204
 205         if (netif_running(dev))
 206                 return -EBUSY;
 207
 208         /* TODO: validate addr */
 209         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 210
 211         return 0;
 212 }
 213
 214 static int
 215 lowpan_fragment_xmit(struct sk_buff *skb, u8 *head,
 216                      int mlen, int plen, int offset, int type)
 217 {
 218         struct sk_buff *frag;
 219         int hlen;
 220
 221         hlen = (type == LOWPAN_DISPATCH_FRAG1) ?
 222                         LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE;
 223
 224         raw_dump_inline(__func__, "6lowpan fragment header", head, hlen);
 225
 226         frag = netdev_alloc_skb(skb->dev,
 227                                 hlen + mlen + plen + IEEE802154_MFR_SIZE);
 228         if (!frag)
 229                 return -ENOMEM;
 230
 231         frag->priority = skb->priority;
 232
 233         /* copy header, MFR and payload */
 234         skb_put(frag, mlen);
 235         skb_copy_to_linear_data(frag, skb_mac_header(skb), mlen);
 236
 237         skb_put(frag, hlen);
 238         skb_copy_to_linear_data_offset(frag, mlen, head, hlen);
 239
 240         skb_put(frag, plen);
 241         skb_copy_to_linear_data_offset(frag, mlen + hlen,
 242                                        skb_network_header(skb) + offset, plen);
 243
 244         raw_dump_table(__func__, " raw fragment dump", frag->data, frag->len);
 245
 246         return dev_queue_xmit(frag);
 247 }
 248
 249 static int
 250 lowpan_skb_fragmentation(struct sk_buff *skb, struct net_device *dev)
 251 {
 252         int err;
 253         u16 dgram_offset, dgram_size, payload_length, header_length,
 254             lowpan_size, frag_plen, offset;
 255         __be16 tag;
 256         u8 head[5];
 257
 258         header_length = skb->mac_len;
 259         payload_length = skb->len - header_length;
 260         tag = lowpan_dev_info(dev)->fragment_tag++;
 261         lowpan_size = skb_network_header_len(skb);
 262         dgram_size = lowpan_uncompress_size(skb, &dgram_offset) -
 263                      header_length;
 264
 265         /* first fragment header */
 266         head[0] = LOWPAN_DISPATCH_FRAG1 | ((dgram_size >> 8) & 0x7);
 267         head[1] = dgram_size & 0xff;
 268         head[2] = tag >> 8;
 269         head[3] = tag & 0xff;
 270
 271         /* calc the nearest payload length(divided to 8) for first fragment
 272          * which fits into a IEEE802154_MTU
 273          */
 274         frag_plen = round_down(IEEE802154_MTU - header_length -
 275                                LOWPAN_FRAG1_HEAD_SIZE - lowpan_size -
 276                                IEEE802154_MFR_SIZE, 8);
 277
 278         err = lowpan_fragment_xmit(skb, head, header_length,
 279                                    frag_plen + lowpan_size, 0,
 280                                    LOWPAN_DISPATCH_FRAG1);
 281         if (err) {
 282                 pr_debug("%s unable to send FRAG1 packet (tag: %d)",
 283                          __func__, tag);
 284                 goto exit;
 285         }
 286
 287         offset = lowpan_size + frag_plen;
 288         dgram_offset += frag_plen;
 289
 290         /* next fragment header */
 291         head[0] &= ~LOWPAN_DISPATCH_FRAG1;
 292         head[0] |= LOWPAN_DISPATCH_FRAGN;
 293
 294         frag_plen = round_down(IEEE802154_MTU - header_length -
 295                                LOWPAN_FRAGN_HEAD_SIZE - IEEE802154_MFR_SIZE, 8);
 296
 297         while (payload_length - offset > 0) {
 298                 int len = frag_plen;
 299
 300                 head[4] = dgram_offset >> 3;
 301
 302                 if (payload_length - offset < len)
 303                         len = payload_length - offset;
 304
 305                 err = lowpan_fragment_xmit(skb, head, header_length, len,
 306                                            offset, LOWPAN_DISPATCH_FRAGN);
 307                 if (err) {
 308                         pr_debug("%s unable to send a FRAGN packet. (tag: %d, offset: %d)\n",
 309                                  __func__, tag, offset);
 310                         goto exit;
 311                 }
 312
 313                 offset += len;
 314                 dgram_offset += len;
 315         }
 316
 317 exit:
 318         return err;
 319 }
 320
 321 static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
 322 {
 323         int err = -1;
 324
 325         pr_debug("package xmit\n");
 326
 327         skb->dev = lowpan_dev_info(dev)->real_dev;
 328         if (skb->dev == NULL) {
 329                 pr_debug("ERROR: no real wpan device found\n");
 330                 goto error;
 331         }
 332
 333         /* Send directly if less than the MTU minus the 2 checksum bytes. */
 334         if (skb->len <= IEEE802154_MTU - IEEE802154_MFR_SIZE) {
 335                 err = dev_queue_xmit(skb);
 336                 goto out;
 337         }
 338
 339         pr_debug("frame is too big, fragmentation is needed\n");
 340         err = lowpan_skb_fragmentation(skb, dev);
 341 error:
 342         dev_kfree_skb(skb);
 343 out:
 344         if (err)
 345                 pr_debug("ERROR: xmit failed\n");
 346
 347         return (err < 0) ? NET_XMIT_DROP : err;
 348 }
 349
 350 static struct wpan_phy *lowpan_get_phy(const struct net_device *dev)
 351 {
 352         struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
 353         return ieee802154_mlme_ops(real_dev)->get_phy(real_dev);
 354 }
 355
 356 static u16 lowpan_get_pan_id(const struct net_device *dev)
 357 {
 358         struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
 359         return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev);
 360 }
 361
 362 static u16 lowpan_get_short_addr(const struct net_device *dev)
 363 {
 364         struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
 365         return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev);
 366 }
 367
 368 static u8 lowpan_get_dsn(const struct net_device *dev)
 369 {
 370         struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
 371         return ieee802154_mlme_ops(real_dev)->get_dsn(real_dev);
 372 }
 373
 374 static struct header_ops lowpan_header_ops = {
 375         .create = lowpan_header_create,
 376 };
 377
 378 static struct lock_class_key lowpan_tx_busylock;
 379 static struct lock_class_key lowpan_netdev_xmit_lock_key;
 380
 381 static void lowpan_set_lockdep_class_one(struct net_device *dev,
 382                                          struct netdev_queue *txq,
 383                                          void *_unused)
 384 {
 385         lockdep_set_class(&txq->_xmit_lock,
 386                           &lowpan_netdev_xmit_lock_key);
 387 }
 388
 389
 390 static int lowpan_dev_init(struct net_device *dev)
 391 {
 392         netdev_for_each_tx_queue(dev, lowpan_set_lockdep_class_one, NULL);
 393         dev->qdisc_tx_busylock = &lowpan_tx_busylock;
 394         return 0;
 395 }
 396
 397 static const struct net_device_ops lowpan_netdev_ops = {
 398         .ndo_init               = lowpan_dev_init,
 399         .ndo_start_xmit         = lowpan_xmit,
 400         .ndo_set_mac_address    = lowpan_set_address,
 401 };
 402
 403 static struct ieee802154_mlme_ops lowpan_mlme = {
 404         .get_pan_id = lowpan_get_pan_id,
 405         .get_phy = lowpan_get_phy,
 406         .get_short_addr = lowpan_get_short_addr,
 407         .get_dsn = lowpan_get_dsn,
 408 };
 409
 410 static void lowpan_setup(struct net_device *dev)
 411 {
 412         dev->addr_len           = IEEE802154_ADDR_LEN;
 413         memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
 414         dev->type               = ARPHRD_IEEE802154;
 415         /* Frame Control + Sequence Number + Address fields + Security Header */
 416         dev->hard_header_len    = 2 + 1 + 20 + 14;
 417         dev->needed_tailroom    = 2; /* FCS */
 418         dev->mtu                = 1281;
 419         dev->tx_queue_len       = 0;
 420         dev->flags              = IFF_BROADCAST | IFF_MULTICAST;
 421         dev->watchdog_timeo     = 0;
 422
 423         dev->netdev_ops         = &lowpan_netdev_ops;
 424         dev->header_ops         = &lowpan_header_ops;
 425         dev->ml_priv            = &lowpan_mlme;
 426         dev->destructor         = free_netdev;
 427 }
 428
 429 static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
 430 {
 431         if (tb[IFLA_ADDRESS]) {
 432                 if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
 433                         return -EINVAL;
 434         }
 435         return 0;
 436 }
 437
 438 static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
 439         struct packet_type *pt, struct net_device *orig_dev)
 440 {
 441         struct sk_buff *local_skb;
 442         int ret;
 443
 444         if (!netif_running(dev))
 445                 goto drop_skb;
 446
 447         if (dev->type != ARPHRD_IEEE802154)
 448                 goto drop_skb;
 449
 450         local_skb = skb_clone(skb, GFP_ATOMIC);
 451         if (!local_skb)
 452                 goto drop_skb;
 453
 454         kfree_skb(skb);
 455
 456         /* check that it's our buffer */
 457         if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
 458                 local_skb->protocol = htons(ETH_P_IPV6);
 459                 local_skb->pkt_type = PACKET_HOST;
 460
 461                 /* Pull off the 1-byte of 6lowpan header. */
 462                 skb_pull(local_skb, 1);
 463
 464                 ret = lowpan_give_skb_to_devices(local_skb, NULL);
 465                 if (ret == NET_RX_DROP)
 466                         goto drop;
 467         } else {
 468                 switch (skb->data[0] & 0xe0) {
 469                 case LOWPAN_DISPATCH_IPHC:      /* ipv6 datagram */
 470                         ret = process_data(local_skb);
 471                         if (ret == NET_RX_DROP)
 472                                 goto drop;
 473                         break;
 474                 case LOWPAN_DISPATCH_FRAG1:     /* first fragment header */
 475                         ret = lowpan_frag_rcv(local_skb, LOWPAN_DISPATCH_FRAG1);
 476                         if (ret == 1) {
 477                                 ret = process_data(local_skb);
 478                                 if (ret == NET_RX_DROP)
 479                                         goto drop;
 480                         }
 481                         break;
 482                 case LOWPAN_DISPATCH_FRAGN:     /* next fragments headers */
 483                         ret = lowpan_frag_rcv(local_skb, LOWPAN_DISPATCH_FRAGN);
 484                         if (ret == 1) {
 485                                 ret = process_data(local_skb);
 486                                 if (ret == NET_RX_DROP)
 487                                         goto drop;
 488                         }
 489                         break;
 490                 default:
 491                         break;
 492                 }
 493         }
 494
 495         return NET_RX_SUCCESS;
 496 drop_skb:
 497         kfree_skb(skb);
 498 drop:
 499         return NET_RX_DROP;
 500 }
 501
 502 static int lowpan_newlink(struct net *src_net, struct net_device *dev,
 503                           struct nlattr *tb[], struct nlattr *data[])
 504 {
 505         struct net_device *real_dev;
 506         struct lowpan_dev_record *entry;
 507
 508         pr_debug("adding new link\n");
 509
 510         if (!tb[IFLA_LINK])
 511                 return -EINVAL;
 512         /* find and hold real wpan device */
 513         real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 514         if (!real_dev)
 515                 return -ENODEV;
 516         if (real_dev->type != ARPHRD_IEEE802154) {
 517                 dev_put(real_dev);
 518                 return -EINVAL;
 519         }
 520
 521         lowpan_dev_info(dev)->real_dev = real_dev;
 522         mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
 523
 524         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
 525         if (!entry) {
 526                 dev_put(real_dev);
 527                 lowpan_dev_info(dev)->real_dev = NULL;
 528                 return -ENOMEM;
 529         }
 530
 531         entry->ldev = dev;
 532
 533         /* Set the lowpan harware address to the wpan hardware address. */
 534         memcpy(dev->dev_addr, real_dev->dev_addr, IEEE802154_ADDR_LEN);
 535
 536         mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
 537         INIT_LIST_HEAD(&entry->list);
 538         list_add_tail(&entry->list, &lowpan_devices);
 539         mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
 540
 541         register_netdevice(dev);
 542
 543         return 0;
 544 }
 545
 546 static void lowpan_dellink(struct net_device *dev, struct list_head *head)
 547 {
 548         struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
 549         struct net_device *real_dev = lowpan_dev->real_dev;
 550         struct lowpan_dev_record *entry, *tmp;
 551
 552         ASSERT_RTNL();
 553
 554         mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
 555         list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
 556                 if (entry->ldev == dev) {
 557                         list_del(&entry->list);
 558                         kfree(entry);
 559                 }
 560         }
 561         mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
 562
 563         mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);
 564
 565         unregister_netdevice_queue(dev, head);
 566
 567         dev_put(real_dev);
 568 }
 569
 570 static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
 571         .kind           = "lowpan",
 572         .priv_size      = sizeof(struct lowpan_dev_info),
 573         .setup          = lowpan_setup,
 574         .newlink        = lowpan_newlink,
 575         .dellink        = lowpan_dellink,
 576         .validate       = lowpan_validate,
 577 };
 578
 579 static inline int __init lowpan_netlink_init(void)
 580 {
 581         return rtnl_link_register(&lowpan_link_ops);
 582 }
 583
 584 static inline void lowpan_netlink_fini(void)
 585 {
 586         rtnl_link_unregister(&lowpan_link_ops);
 587 }
 588
 589 static int lowpan_device_event(struct notifier_block *unused,
 590                                unsigned long event, void *ptr)
 591 {
 592         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 593         LIST_HEAD(del_list);
 594         struct lowpan_dev_record *entry, *tmp;
 595
 596         if (dev->type != ARPHRD_IEEE802154)
 597                 goto out;
 598
 599         if (event == NETDEV_UNREGISTER) {
 600                 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
 601                         if (lowpan_dev_info(entry->ldev)->real_dev == dev)
 602                                 lowpan_dellink(entry->ldev, &del_list);
 603                 }
 604
 605                 unregister_netdevice_many(&del_list);
 606         }
 607
 608 out:
 609         return NOTIFY_DONE;
 610 }
 611
 612 static struct notifier_block lowpan_dev_notifier = {
 613         .notifier_call = lowpan_device_event,
 614 };
 615
 616 static struct packet_type lowpan_packet_type = {
 617         .type = __constant_htons(ETH_P_IEEE802154),
 618         .func = lowpan_rcv,
 619 };
 620
 621 static int __init lowpan_init_module(void)
 622 {
 623         int err = 0;
 624
 625         err = lowpan_net_frag_init();
 626         if (err < 0)
 627                 goto out;
 628
 629         err = lowpan_netlink_init();
 630         if (err < 0)
 631                 goto out_frag;
 632
 633         dev_add_pack(&lowpan_packet_type);
 634
 635         err = register_netdevice_notifier(&lowpan_dev_notifier);
 636         if (err < 0)
 637                 goto out_pack;
 638
 639         return 0;
 640
 641 out_pack:
 642         dev_remove_pack(&lowpan_packet_type);
 643         lowpan_netlink_fini();
 644 out_frag:
 645         lowpan_net_frag_exit();
 646 out:
 647         return err;
 648 }
 649
 650 static void __exit lowpan_cleanup_module(void)
 651 {
 652         lowpan_netlink_fini();
 653
 654         dev_remove_pack(&lowpan_packet_type);
 655
 656         lowpan_net_frag_exit();
 657
 658         unregister_netdevice_notifier(&lowpan_dev_notifier);
 659 }
 660
 661 module_init(lowpan_init_module);
 662 module_exit(lowpan_cleanup_module);
 663 MODULE_LICENSE("GPL");
 664 MODULE_ALIAS_RTNL_LINK("lowpan");