net/bluetooth/6lowpan.c

   1 /*
   2    Copyright (c) 2013-2014 Intel Corp.
   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 and
   6    only version 2 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
  14 #include <linux/if_arp.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/etherdevice.h>
  17 #include <linux/module.h>
  18 #include <linux/debugfs.h>
  19
  20 #include <net/ipv6.h>
  21 #include <net/ip6_route.h>
  22 #include <net/addrconf.h>
  23
  24 #include <net/af_ieee802154.h> /* to get the address type */
  25
  26 #include <net/bluetooth/bluetooth.h>
  27 #include <net/bluetooth/hci_core.h>
  28 #include <net/bluetooth/l2cap.h>
  29
  30 #include <net/6lowpan.h> /* for the compression support */
  31
  32 #define VERSION "0.1"
  33
  34 static struct dentry *lowpan_psm_debugfs;
  35 static struct dentry *lowpan_control_debugfs;
  36
  37 #define IFACE_NAME_TEMPLATE "bt%d"
  38 #define EUI64_ADDR_LEN 8
  39
  40 struct skb_cb {
  41         struct in6_addr addr;
  42         struct in6_addr gw;
  43         struct l2cap_chan *chan;
  44         int status;
  45 };
  46 #define lowpan_cb(skb) ((struct skb_cb *)((skb)->cb))
  47
  48 /* The devices list contains those devices that we are acting
  49  * as a proxy. The BT 6LoWPAN device is a virtual device that
  50  * connects to the Bluetooth LE device. The real connection to
  51  * BT device is done via l2cap layer. There exists one
  52  * virtual device / one BT 6LoWPAN network (=hciX device).
  53  * The list contains struct lowpan_dev elements.
  54  */
  55 static LIST_HEAD(bt_6lowpan_devices);
  56 static DEFINE_SPINLOCK(devices_lock);
  57
  58 /* If psm is set to 0 (default value), then 6lowpan is disabled.
  59  * Other values are used to indicate a Protocol Service Multiplexer
  60  * value for 6lowpan.
  61  */
  62 static u16 psm_6lowpan;
  63
  64 /* We are listening incoming connections via this channel
  65  */
  66 static struct l2cap_chan *listen_chan;
  67
  68 struct lowpan_peer {
  69         struct list_head list;
  70         struct rcu_head rcu;
  71         struct l2cap_chan *chan;
  72
  73         /* peer addresses in various formats */
  74         unsigned char eui64_addr[EUI64_ADDR_LEN];
  75         struct in6_addr peer_addr;
  76 };
  77
  78 struct lowpan_dev {
  79         struct list_head list;
  80
  81         struct hci_dev *hdev;
  82         struct net_device *netdev;
  83         struct list_head peers;
  84         atomic_t peer_count; /* number of items in peers list */
  85
  86         struct work_struct delete_netdev;
  87         struct delayed_work notify_peers;
  88 };
  89
  90 static inline struct lowpan_dev *lowpan_dev(const struct net_device *netdev)
  91 {
  92         return netdev_priv(netdev);
  93 }
  94
  95 static inline void peer_add(struct lowpan_dev *dev, struct lowpan_peer *peer)
  96 {
  97         list_add_rcu(&peer->list, &dev->peers);
  98         atomic_inc(&dev->peer_count);
  99 }
 100
 101 static inline bool peer_del(struct lowpan_dev *dev, struct lowpan_peer *peer)
 102 {
 103         list_del_rcu(&peer->list);
 104         kfree_rcu(peer, rcu);
 105
 106         module_put(THIS_MODULE);
 107
 108         if (atomic_dec_and_test(&dev->peer_count)) {
 109                 BT_DBG("last peer");
 110                 return true;
 111         }
 112
 113         return false;
 114 }
 115
 116 static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_dev *dev,
 117                                                  bdaddr_t *ba, __u8 type)
 118 {
 119         struct lowpan_peer *peer;
 120
 121         BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count),
 122                ba, type);
 123
 124         rcu_read_lock();
 125
 126         list_for_each_entry_rcu(peer, &dev->peers, list) {
 127                 BT_DBG("dst addr %pMR dst type %d",
 128                        &peer->chan->dst, peer->chan->dst_type);
 129
 130                 if (bacmp(&peer->chan->dst, ba))
 131                         continue;
 132
 133                 if (type == peer->chan->dst_type) {
 134                         rcu_read_unlock();
 135                         return peer;
 136                 }
 137         }
 138
 139         rcu_read_unlock();
 140
 141         return NULL;
 142 }
 143
 144 static inline struct lowpan_peer *__peer_lookup_chan(struct lowpan_dev *dev,
 145                                                      struct l2cap_chan *chan)
 146 {
 147         struct lowpan_peer *peer;
 148
 149         list_for_each_entry_rcu(peer, &dev->peers, list) {
 150                 if (peer->chan == chan)
 151                         return peer;
 152         }
 153
 154         return NULL;
 155 }
 156
 157 static inline struct lowpan_peer *__peer_lookup_conn(struct lowpan_dev *dev,
 158                                                      struct l2cap_conn *conn)
 159 {
 160         struct lowpan_peer *peer;
 161
 162         list_for_each_entry_rcu(peer, &dev->peers, list) {
 163                 if (peer->chan->conn == conn)
 164                         return peer;
 165         }
 166
 167         return NULL;
 168 }
 169
 170 static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_dev *dev,
 171                                                   struct in6_addr *daddr,
 172                                                   struct sk_buff *skb)
 173 {
 174         struct lowpan_peer *peer;
 175         struct in6_addr *nexthop;
 176         struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
 177         int count = atomic_read(&dev->peer_count);
 178
 179         BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt);
 180
 181         /* If we have multiple 6lowpan peers, then check where we should
 182          * send the packet. If only one peer exists, then we can send the
 183          * packet right away.
 184          */
 185         if (count == 1) {
 186                 rcu_read_lock();
 187                 peer = list_first_or_null_rcu(&dev->peers, struct lowpan_peer,
 188                                               list);
 189                 rcu_read_unlock();
 190                 return peer;
 191         }
 192
 193         if (!rt) {
 194                 nexthop = &lowpan_cb(skb)->gw;
 195
 196                 if (ipv6_addr_any(nexthop))
 197                         return NULL;
 198         } else {
 199                 nexthop = rt6_nexthop(rt);
 200
 201                 /* We need to remember the address because it is needed
 202                  * by bt_xmit() when sending the packet. In bt_xmit(), the
 203                  * destination routing info is not set.
 204                  */
 205                 memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr));
 206         }
 207
 208         BT_DBG("gw %pI6c", nexthop);
 209
 210         rcu_read_lock();
 211
 212         list_for_each_entry_rcu(peer, &dev->peers, list) {
 213                 BT_DBG("dst addr %pMR dst type %d ip %pI6c",
 214                        &peer->chan->dst, peer->chan->dst_type,
 215                        &peer->peer_addr);
 216
 217                 if (!ipv6_addr_cmp(&peer->peer_addr, nexthop)) {
 218                         rcu_read_unlock();
 219                         return peer;
 220                 }
 221         }
 222
 223         rcu_read_unlock();
 224
 225         return NULL;
 226 }
 227
 228 static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn)
 229 {
 230         struct lowpan_dev *entry;
 231         struct lowpan_peer *peer = NULL;
 232
 233         rcu_read_lock();
 234
 235         list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
 236                 peer = __peer_lookup_conn(entry, conn);
 237                 if (peer)
 238                         break;
 239         }
 240
 241         rcu_read_unlock();
 242
 243         return peer;
 244 }
 245
 246 static struct lowpan_dev *lookup_dev(struct l2cap_conn *conn)
 247 {
 248         struct lowpan_dev *entry;
 249         struct lowpan_dev *dev = NULL;
 250
 251         rcu_read_lock();
 252
 253         list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
 254                 if (conn->hcon->hdev == entry->hdev) {
 255                         dev = entry;
 256                         break;
 257                 }
 258         }
 259
 260         rcu_read_unlock();
 261
 262         return dev;
 263 }
 264
 265 static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev)
 266 {
 267         struct sk_buff *skb_cp;
 268
 269         skb_cp = skb_copy(skb, GFP_ATOMIC);
 270         if (!skb_cp)
 271                 return NET_RX_DROP;
 272
 273         return netif_rx(skb_cp);
 274 }
 275
 276 static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev,
 277                            struct l2cap_chan *chan)
 278 {
 279         const u8 *saddr, *daddr;
 280         u8 iphc0, iphc1;
 281         struct lowpan_dev *dev;
 282         struct lowpan_peer *peer;
 283
 284         dev = lowpan_dev(netdev);
 285
 286         rcu_read_lock();
 287         peer = __peer_lookup_chan(dev, chan);
 288         rcu_read_unlock();
 289         if (!peer)
 290                 return -EINVAL;
 291
 292         saddr = peer->eui64_addr;
 293         daddr = dev->netdev->dev_addr;
 294
 295         /* at least two bytes will be used for the encoding */
 296         if (skb->len < 2)
 297                 return -EINVAL;
 298
 299         if (lowpan_fetch_skb_u8(skb, &iphc0))
 300                 return -EINVAL;
 301
 302         if (lowpan_fetch_skb_u8(skb, &iphc1))
 303                 return -EINVAL;
 304
 305         return lowpan_header_decompress(skb, netdev,
 306                                         saddr, IEEE802154_ADDR_LONG,
 307                                         EUI64_ADDR_LEN, daddr,
 308                                         IEEE802154_ADDR_LONG, EUI64_ADDR_LEN,
 309                                         iphc0, iphc1);
 310
 311 }
 312
 313 static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
 314                     struct l2cap_chan *chan)
 315 {
 316         struct sk_buff *local_skb;
 317         int ret;
 318
 319         if (!netif_running(dev))
 320                 goto drop;
 321
 322         if (dev->type != ARPHRD_6LOWPAN)
 323                 goto drop;
 324
 325         skb = skb_share_check(skb, GFP_ATOMIC);
 326         if (!skb)
 327                 goto drop;
 328
 329         /* check that it's our buffer */
 330         if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
 331                 /* Copy the packet so that the IPv6 header is
 332                  * properly aligned.
 333                  */
 334                 local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1,
 335                                             skb_tailroom(skb), GFP_ATOMIC);
 336                 if (!local_skb)
 337                         goto drop;
 338
 339                 local_skb->protocol = htons(ETH_P_IPV6);
 340                 local_skb->pkt_type = PACKET_HOST;
 341
 342                 skb_reset_network_header(local_skb);
 343                 skb_set_transport_header(local_skb, sizeof(struct ipv6hdr));
 344
 345                 if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) {
 346                         kfree_skb(local_skb);
 347                         goto drop;
 348                 }
 349
 350                 dev->stats.rx_bytes += skb->len;
 351                 dev->stats.rx_packets++;
 352
 353                 consume_skb(local_skb);
 354                 consume_skb(skb);
 355         } else {
 356                 switch (skb->data[0] & 0xe0) {
 357                 case LOWPAN_DISPATCH_IPHC:      /* ipv6 datagram */
 358                         local_skb = skb_clone(skb, GFP_ATOMIC);
 359                         if (!local_skb)
 360                                 goto drop;
 361
 362                         ret = iphc_decompress(local_skb, dev, chan);
 363                         if (ret < 0) {
 364                                 kfree_skb(local_skb);
 365                                 goto drop;
 366                         }
 367
 368                         local_skb->protocol = htons(ETH_P_IPV6);
 369                         local_skb->pkt_type = PACKET_HOST;
 370                         local_skb->dev = dev;
 371
 372                         if (give_skb_to_upper(local_skb, dev)
 373                                         != NET_RX_SUCCESS) {
 374                                 kfree_skb(local_skb);
 375                                 goto drop;
 376                         }
 377
 378                         dev->stats.rx_bytes += skb->len;
 379                         dev->stats.rx_packets++;
 380
 381                         consume_skb(local_skb);
 382                         consume_skb(skb);
 383                         break;
 384                 default:
 385                         break;
 386                 }
 387         }
 388
 389         return NET_RX_SUCCESS;
 390
 391 drop:
 392         dev->stats.rx_dropped++;
 393         kfree_skb(skb);
 394         return NET_RX_DROP;
 395 }
 396
 397 /* Packet from BT LE device */
 398 static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
 399 {
 400         struct lowpan_dev *dev;
 401         struct lowpan_peer *peer;
 402         int err;
 403
 404         peer = lookup_peer(chan->conn);
 405         if (!peer)
 406                 return -ENOENT;
 407
 408         dev = lookup_dev(chan->conn);
 409         if (!dev || !dev->netdev)
 410                 return -ENOENT;
 411
 412         err = recv_pkt(skb, dev->netdev, chan);
 413         if (err) {
 414                 BT_DBG("recv pkt %d", err);
 415                 err = -EAGAIN;
 416         }
 417
 418         return err;
 419 }
 420
 421 static u8 get_addr_type_from_eui64(u8 byte)
 422 {
 423         /* Is universal(0) or local(1) bit */
 424         return ((byte & 0x02) ? BDADDR_LE_RANDOM : BDADDR_LE_PUBLIC);
 425 }
 426
 427 static void copy_to_bdaddr(struct in6_addr *ip6_daddr, bdaddr_t *addr)
 428 {
 429         u8 *eui64 = ip6_daddr->s6_addr + 8;
 430
 431         addr->b[0] = eui64[7];
 432         addr->b[1] = eui64[6];
 433         addr->b[2] = eui64[5];
 434         addr->b[3] = eui64[2];
 435         addr->b[4] = eui64[1];
 436         addr->b[5] = eui64[0];
 437 }
 438
 439 static void convert_dest_bdaddr(struct in6_addr *ip6_daddr,
 440                                 bdaddr_t *addr, u8 *addr_type)
 441 {
 442         copy_to_bdaddr(ip6_daddr, addr);
 443
 444         /* We need to toggle the U/L bit that we got from IPv6 address
 445          * so that we get the proper address and type of the BD address.
 446          */
 447         addr->b[5] ^= 0x02;
 448
 449         *addr_type = get_addr_type_from_eui64(addr->b[5]);
 450 }
 451
 452 static int setup_header(struct sk_buff *skb, struct net_device *netdev,
 453                         bdaddr_t *peer_addr, u8 *peer_addr_type)
 454 {
 455         struct in6_addr ipv6_daddr;
 456         struct lowpan_dev *dev;
 457         struct lowpan_peer *peer;
 458         bdaddr_t addr, *any = BDADDR_ANY;
 459         u8 *daddr = any->b;
 460         int err, status = 0;
 461
 462         dev = lowpan_dev(netdev);
 463
 464         memcpy(&ipv6_daddr, &lowpan_cb(skb)->addr, sizeof(ipv6_daddr));
 465
 466         if (ipv6_addr_is_multicast(&ipv6_daddr)) {
 467                 lowpan_cb(skb)->chan = NULL;
 468         } else {
 469                 u8 addr_type;
 470
 471                 /* Get destination BT device from skb.
 472                  * If there is no such peer then discard the packet.
 473                  */
 474                 convert_dest_bdaddr(&ipv6_daddr, &addr, &addr_type);
 475
 476                 BT_DBG("dest addr %pMR type %d IP %pI6c", &addr,
 477                        addr_type, &ipv6_daddr);
 478
 479                 peer = peer_lookup_ba(dev, &addr, addr_type);
 480                 if (!peer) {
 481                         /* The packet might be sent to 6lowpan interface
 482                          * because of routing (either via default route
 483                          * or user set route) so get peer according to
 484                          * the destination address.
 485                          */
 486                         peer = peer_lookup_dst(dev, &ipv6_daddr, skb);
 487                         if (!peer) {
 488                                 BT_DBG("no such peer %pMR found", &addr);
 489                                 return -ENOENT;
 490                         }
 491                 }
 492
 493                 daddr = peer->eui64_addr;
 494                 *peer_addr = addr;
 495                 *peer_addr_type = addr_type;
 496                 lowpan_cb(skb)->chan = peer->chan;
 497
 498                 status = 1;
 499         }
 500
 501         lowpan_header_compress(skb, netdev, ETH_P_IPV6, daddr,
 502                                dev->netdev->dev_addr, skb->len);
 503
 504         err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0);
 505         if (err < 0)
 506                 return err;
 507
 508         return status;
 509 }
 510
 511 static int header_create(struct sk_buff *skb, struct net_device *netdev,
 512                          unsigned short type, const void *_daddr,
 513                          const void *_saddr, unsigned int len)
 514 {
 515         struct ipv6hdr *hdr;
 516
 517         if (type != ETH_P_IPV6)
 518                 return -EINVAL;
 519
 520         hdr = ipv6_hdr(skb);
 521
 522         memcpy(&lowpan_cb(skb)->addr, &hdr->daddr, sizeof(struct in6_addr));
 523
 524         return 0;
 525 }
 526
 527 /* Packet to BT LE device */
 528 static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb,
 529                     struct net_device *netdev)
 530 {
 531         struct msghdr msg;
 532         struct kvec iv;
 533         int err;
 534
 535         /* Remember the skb so that we can send EAGAIN to the caller if
 536          * we run out of credits.
 537          */
 538         chan->data = skb;
 539
 540         iv.iov_base = skb->data;
 541         iv.iov_len = skb->len;
 542
 543         memset(&msg, 0, sizeof(msg));
 544         iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, &iv, 1, skb->len);
 545
 546         err = l2cap_chan_send(chan, &msg, skb->len);
 547         if (err > 0) {
 548                 netdev->stats.tx_bytes += err;
 549                 netdev->stats.tx_packets++;
 550                 return 0;
 551         }
 552
 553         if (!err)
 554                 err = lowpan_cb(skb)->status;
 555
 556         if (err < 0) {
 557                 if (err == -EAGAIN)
 558                         netdev->stats.tx_dropped++;
 559                 else
 560                         netdev->stats.tx_errors++;
 561         }
 562
 563         return err;
 564 }
 565
 566 static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev)
 567 {
 568         struct sk_buff *local_skb;
 569         struct lowpan_dev *entry;
 570         int err = 0;
 571
 572         rcu_read_lock();
 573
 574         list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
 575                 struct lowpan_peer *pentry;
 576                 struct lowpan_dev *dev;
 577
 578                 if (entry->netdev != netdev)
 579                         continue;
 580
 581                 dev = lowpan_dev(entry->netdev);
 582
 583                 list_for_each_entry_rcu(pentry, &dev->peers, list) {
 584                         int ret;
 585
 586                         local_skb = skb_clone(skb, GFP_ATOMIC);
 587
 588                         BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
 589                                netdev->name,
 590                                &pentry->chan->dst, pentry->chan->dst_type,
 591                                &pentry->peer_addr, pentry->chan);
 592                         ret = send_pkt(pentry->chan, local_skb, netdev);
 593                         if (ret < 0)
 594                                 err = ret;
 595
 596                         kfree_skb(local_skb);
 597                 }
 598         }
 599
 600         rcu_read_unlock();
 601
 602         return err;
 603 }
 604
 605 static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev)
 606 {
 607         int err = 0;
 608         bdaddr_t addr;
 609         u8 addr_type;
 610
 611         /* We must take a copy of the skb before we modify/replace the ipv6
 612          * header as the header could be used elsewhere
 613          */
 614         skb = skb_unshare(skb, GFP_ATOMIC);
 615         if (!skb)
 616                 return NET_XMIT_DROP;
 617
 618         /* Return values from setup_header()
 619          *  <0 - error, packet is dropped
 620          *   0 - this is a multicast packet
 621          *   1 - this is unicast packet
 622          */
 623         err = setup_header(skb, netdev, &addr, &addr_type);
 624         if (err < 0) {
 625                 kfree_skb(skb);
 626                 return NET_XMIT_DROP;
 627         }
 628
 629         if (err) {
 630                 if (lowpan_cb(skb)->chan) {
 631                         BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
 632                                netdev->name, &addr, addr_type,
 633                                &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan);
 634                         err = send_pkt(lowpan_cb(skb)->chan, skb, netdev);
 635                 } else {
 636                         err = -ENOENT;
 637                 }
 638         } else {
 639                 /* We need to send the packet to every device behind this
 640                  * interface.
 641                  */
 642                 err = send_mcast_pkt(skb, netdev);
 643         }
 644
 645         dev_kfree_skb(skb);
 646
 647         if (err)
 648                 BT_DBG("ERROR: xmit failed (%d)", err);
 649
 650         return err < 0 ? NET_XMIT_DROP : err;
 651 }
 652
 653 static struct lock_class_key bt_tx_busylock;
 654 static struct lock_class_key bt_netdev_xmit_lock_key;
 655
 656 static void bt_set_lockdep_class_one(struct net_device *dev,
 657                                      struct netdev_queue *txq,
 658                                      void *_unused)
 659 {
 660         lockdep_set_class(&txq->_xmit_lock, &bt_netdev_xmit_lock_key);
 661 }
 662
 663 static int bt_dev_init(struct net_device *dev)
 664 {
 665         netdev_for_each_tx_queue(dev, bt_set_lockdep_class_one, NULL);
 666         dev->qdisc_tx_busylock = &bt_tx_busylock;
 667
 668         return 0;
 669 }
 670
 671 static const struct net_device_ops netdev_ops = {
 672         .ndo_init               = bt_dev_init,
 673         .ndo_start_xmit         = bt_xmit,
 674 };
 675
 676 static struct header_ops header_ops = {
 677         .create = header_create,
 678 };
 679
 680 static void netdev_setup(struct net_device *dev)
 681 {
 682         dev->addr_len           = EUI64_ADDR_LEN;
 683         dev->type               = ARPHRD_6LOWPAN;
 684
 685         dev->hard_header_len    = 0;
 686         dev->needed_tailroom    = 0;
 687         dev->mtu                = IPV6_MIN_MTU;
 688         dev->tx_queue_len       = 0;
 689         dev->flags              = IFF_RUNNING | IFF_POINTOPOINT |
 690                                   IFF_MULTICAST;
 691         dev->watchdog_timeo     = 0;
 692
 693         dev->netdev_ops         = &netdev_ops;
 694         dev->header_ops         = &header_ops;
 695         dev->destructor         = free_netdev;
 696 }
 697
 698 static struct device_type bt_type = {
 699         .name   = "bluetooth",
 700 };
 701
 702 static void set_addr(u8 *eui, u8 *addr, u8 addr_type)
 703 {
 704         /* addr is the BT address in little-endian format */
 705         eui[0] = addr[5];
 706         eui[1] = addr[4];
 707         eui[2] = addr[3];
 708         eui[3] = 0xFF;
 709         eui[4] = 0xFE;
 710         eui[5] = addr[2];
 711         eui[6] = addr[1];
 712         eui[7] = addr[0];
 713
 714         /* Universal/local bit set, BT 6lowpan draft ch. 3.2.1 */
 715         if (addr_type == BDADDR_LE_PUBLIC)
 716                 eui[0] &= ~0x02;
 717         else
 718                 eui[0] |= 0x02;
 719
 720         BT_DBG("type %d addr %*phC", addr_type, 8, eui);
 721 }
 722
 723 static void set_dev_addr(struct net_device *netdev, bdaddr_t *addr,
 724                          u8 addr_type)
 725 {
 726         netdev->addr_assign_type = NET_ADDR_PERM;
 727         set_addr(netdev->dev_addr, addr->b, addr_type);
 728 }
 729
 730 static void ifup(struct net_device *netdev)
 731 {
 732         int err;
 733
 734         rtnl_lock();
 735         err = dev_open(netdev);
 736         if (err < 0)
 737                 BT_INFO("iface %s cannot be opened (%d)", netdev->name, err);
 738         rtnl_unlock();
 739 }
 740
 741 static void ifdown(struct net_device *netdev)
 742 {
 743         int err;
 744
 745         rtnl_lock();
 746         err = dev_close(netdev);
 747         if (err < 0)
 748                 BT_INFO("iface %s cannot be closed (%d)", netdev->name, err);
 749         rtnl_unlock();
 750 }
 751
 752 static void do_notify_peers(struct work_struct *work)
 753 {
 754         struct lowpan_dev *dev = container_of(work, struct lowpan_dev,
 755                                               notify_peers.work);
 756
 757         netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */
 758 }
 759
 760 static bool is_bt_6lowpan(struct hci_conn *hcon)
 761 {
 762         if (hcon->type != LE_LINK)
 763                 return false;
 764
 765         if (!psm_6lowpan)
 766                 return false;
 767
 768         return true;
 769 }
 770
 771 static struct l2cap_chan *chan_create(void)
 772 {
 773         struct l2cap_chan *chan;
 774
 775         chan = l2cap_chan_create();
 776         if (!chan)
 777                 return NULL;
 778
 779         l2cap_chan_set_defaults(chan);
 780
 781         chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
 782         chan->mode = L2CAP_MODE_LE_FLOWCTL;
 783         chan->omtu = 65535;
 784         chan->imtu = chan->omtu;
 785
 786         return chan;
 787 }
 788
 789 static struct l2cap_chan *chan_open(struct l2cap_chan *pchan)
 790 {
 791         struct l2cap_chan *chan;
 792
 793         chan = chan_create();
 794         if (!chan)
 795                 return NULL;
 796
 797         chan->remote_mps = chan->omtu;
 798         chan->mps = chan->omtu;
 799
 800         chan->state = BT_CONNECTED;
 801
 802         return chan;
 803 }
 804
 805 static void set_ip_addr_bits(u8 addr_type, u8 *addr)
 806 {
 807         if (addr_type == BDADDR_LE_PUBLIC)
 808                 *addr |= 0x02;
 809         else
 810                 *addr &= ~0x02;
 811 }
 812
 813 static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan,
 814                                         struct lowpan_dev *dev)
 815 {
 816         struct lowpan_peer *peer;
 817
 818         peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
 819         if (!peer)
 820                 return NULL;
 821
 822         peer->chan = chan;
 823         memset(&peer->peer_addr, 0, sizeof(struct in6_addr));
 824
 825         /* RFC 2464 ch. 5 */
 826         peer->peer_addr.s6_addr[0] = 0xFE;
 827         peer->peer_addr.s6_addr[1] = 0x80;
 828         set_addr((u8 *)&peer->peer_addr.s6_addr + 8, chan->dst.b,
 829                  chan->dst_type);
 830
 831         memcpy(&peer->eui64_addr, (u8 *)&peer->peer_addr.s6_addr + 8,
 832                EUI64_ADDR_LEN);
 833
 834         /* IPv6 address needs to have the U/L bit set properly so toggle
 835          * it back here.
 836          */
 837         set_ip_addr_bits(chan->dst_type, (u8 *)&peer->peer_addr.s6_addr + 8);
 838
 839         spin_lock(&devices_lock);
 840         INIT_LIST_HEAD(&peer->list);
 841         peer_add(dev, peer);
 842         spin_unlock(&devices_lock);
 843
 844         /* Notifying peers about us needs to be done without locks held */
 845         INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers);
 846         schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100));
 847
 848         return peer->chan;
 849 }
 850
 851 static int setup_netdev(struct l2cap_chan *chan, struct lowpan_dev **dev)
 852 {
 853         struct net_device *netdev;
 854         int err = 0;
 855
 856         netdev = alloc_netdev(sizeof(struct lowpan_dev), IFACE_NAME_TEMPLATE,
 857                               NET_NAME_UNKNOWN, netdev_setup);
 858         if (!netdev)
 859                 return -ENOMEM;
 860
 861         set_dev_addr(netdev, &chan->src, chan->src_type);
 862
 863         netdev->netdev_ops = &netdev_ops;
 864         SET_NETDEV_DEV(netdev, &chan->conn->hcon->dev);
 865         SET_NETDEV_DEVTYPE(netdev, &bt_type);
 866
 867         err = register_netdev(netdev);
 868         if (err < 0) {
 869                 BT_INFO("register_netdev failed %d", err);
 870                 free_netdev(netdev);
 871                 goto out;
 872         }
 873
 874         BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d",
 875                netdev->ifindex, &chan->dst, chan->dst_type,
 876                &chan->src, chan->src_type);
 877         set_bit(__LINK_STATE_PRESENT, &netdev->state);
 878
 879         *dev = netdev_priv(netdev);
 880         (*dev)->netdev = netdev;
 881         (*dev)->hdev = chan->conn->hcon->hdev;
 882         INIT_LIST_HEAD(&(*dev)->peers);
 883
 884         spin_lock(&devices_lock);
 885         INIT_LIST_HEAD(&(*dev)->list);
 886         list_add_rcu(&(*dev)->list, &bt_6lowpan_devices);
 887         spin_unlock(&devices_lock);
 888
 889         return 0;
 890
 891 out:
 892         return err;
 893 }
 894
 895 static inline void chan_ready_cb(struct l2cap_chan *chan)
 896 {
 897         struct lowpan_dev *dev;
 898
 899         dev = lookup_dev(chan->conn);
 900
 901         BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev);
 902
 903         if (!dev) {
 904                 if (setup_netdev(chan, &dev) < 0) {
 905                         l2cap_chan_del(chan, -ENOENT);
 906                         return;
 907                 }
 908         }
 909
 910         if (!try_module_get(THIS_MODULE))
 911                 return;
 912
 913         add_peer_chan(chan, dev);
 914         ifup(dev->netdev);
 915 }
 916
 917 static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan)
 918 {
 919         struct l2cap_chan *chan;
 920
 921         chan = chan_open(pchan);
 922         chan->ops = pchan->ops;
 923
 924         BT_DBG("chan %p pchan %p", chan, pchan);
 925
 926         return chan;
 927 }
 928
 929 static void delete_netdev(struct work_struct *work)
 930 {
 931         struct lowpan_dev *entry = container_of(work, struct lowpan_dev,
 932                                                 delete_netdev);
 933
 934         unregister_netdev(entry->netdev);
 935
 936         /* The entry pointer is deleted in device_event() */
 937 }
 938
 939 static void chan_close_cb(struct l2cap_chan *chan)
 940 {
 941         struct lowpan_dev *entry;
 942         struct lowpan_dev *dev = NULL;
 943         struct lowpan_peer *peer;
 944         int err = -ENOENT;
 945         bool last = false, removed = true;
 946
 947         BT_DBG("chan %p conn %p", chan, chan->conn);
 948
 949         if (chan->conn && chan->conn->hcon) {
 950                 if (!is_bt_6lowpan(chan->conn->hcon))
 951                         return;
 952
 953                 /* If conn is set, then the netdev is also there and we should
 954                  * not remove it.
 955                  */
 956                 removed = false;
 957         }
 958
 959         spin_lock(&devices_lock);
 960
 961         list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
 962                 dev = lowpan_dev(entry->netdev);
 963                 peer = __peer_lookup_chan(dev, chan);
 964                 if (peer) {
 965                         last = peer_del(dev, peer);
 966                         err = 0;
 967
 968                         BT_DBG("dev %p removing %speer %p", dev,
 969                                last ? "last " : "1 ", peer);
 970                         BT_DBG("chan %p orig refcnt %d", chan,
 971                                atomic_read(&chan->kref.refcount));
 972
 973                         l2cap_chan_put(chan);
 974                         break;
 975                 }
 976         }
 977
 978         if (!err && last && dev && !atomic_read(&dev->peer_count)) {
 979                 spin_unlock(&devices_lock);
 980
 981                 cancel_delayed_work_sync(&dev->notify_peers);
 982
 983                 ifdown(dev->netdev);
 984
 985                 if (!removed) {
 986                         INIT_WORK(&entry->delete_netdev, delete_netdev);
 987                         schedule_work(&entry->delete_netdev);
 988                 }
 989         } else {
 990                 spin_unlock(&devices_lock);
 991         }
 992
 993         return;
 994 }
 995
 996 static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err)
 997 {
 998         BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn,
 999                state_to_string(state), err);
1000 }
1001
1002 static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan,
1003                                          unsigned long hdr_len,
1004                                          unsigned long len, int nb)
1005 {
1006         /* Note that we must allocate using GFP_ATOMIC here as
1007          * this function is called originally from netdev hard xmit
1008          * function in atomic context.
1009          */
1010         return bt_skb_alloc(hdr_len + len, GFP_ATOMIC);
1011 }
1012
1013 static void chan_suspend_cb(struct l2cap_chan *chan)
1014 {
1015         struct sk_buff *skb = chan->data;
1016
1017         BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb);
1018
1019         if (!skb)
1020                 return;
1021
1022         lowpan_cb(skb)->status = -EAGAIN;
1023 }
1024
1025 static void chan_resume_cb(struct l2cap_chan *chan)
1026 {
1027         struct sk_buff *skb = chan->data;
1028
1029         BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb);
1030
1031         if (!skb)
1032                 return;
1033
1034         lowpan_cb(skb)->status = 0;
1035 }
1036
1037 static long chan_get_sndtimeo_cb(struct l2cap_chan *chan)
1038 {
1039         return L2CAP_CONN_TIMEOUT;
1040 }
1041
1042 static const struct l2cap_ops bt_6lowpan_chan_ops = {
1043         .name                   = "L2CAP 6LoWPAN channel",
1044         .new_connection         = chan_new_conn_cb,
1045         .recv                   = chan_recv_cb,
1046         .close                  = chan_close_cb,
1047         .state_change           = chan_state_change_cb,
1048         .ready                  = chan_ready_cb,
1049         .resume                 = chan_resume_cb,
1050         .suspend                = chan_suspend_cb,
1051         .get_sndtimeo           = chan_get_sndtimeo_cb,
1052         .alloc_skb              = chan_alloc_skb_cb,
1053
1054         .teardown               = l2cap_chan_no_teardown,
1055         .defer                  = l2cap_chan_no_defer,
1056         .set_shutdown           = l2cap_chan_no_set_shutdown,
1057 };
1058
1059 static inline __u8 bdaddr_type(__u8 type)
1060 {
1061         if (type == ADDR_LE_DEV_PUBLIC)
1062                 return BDADDR_LE_PUBLIC;
1063         else
1064                 return BDADDR_LE_RANDOM;
1065 }
1066
1067 static struct l2cap_chan *chan_get(void)
1068 {
1069         struct l2cap_chan *pchan;
1070
1071         pchan = chan_create();
1072         if (!pchan)
1073                 return NULL;
1074
1075         pchan->ops = &bt_6lowpan_chan_ops;
1076
1077         return pchan;
1078 }
1079
1080 static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type)
1081 {
1082         struct l2cap_chan *pchan;
1083         int err;
1084
1085         pchan = chan_get();
1086         if (!pchan)
1087                 return -EINVAL;
1088
1089         err = l2cap_chan_connect(pchan, cpu_to_le16(psm_6lowpan), 0,
1090                                  addr, dst_type);
1091
1092         BT_DBG("chan %p err %d", pchan, err);
1093         if (err < 0)
1094                 l2cap_chan_put(pchan);
1095
1096         return err;
1097 }
1098
1099 static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type)
1100 {
1101         struct lowpan_peer *peer;
1102
1103         BT_DBG("conn %p dst type %d", conn, dst_type);
1104
1105         peer = lookup_peer(conn);
1106         if (!peer)
1107                 return -ENOENT;
1108
1109         BT_DBG("peer %p chan %p", peer, peer->chan);
1110
1111         l2cap_chan_close(peer->chan, ENOENT);
1112
1113         return 0;
1114 }
1115
1116 static struct l2cap_chan *bt_6lowpan_listen(void)
1117 {
1118         bdaddr_t *addr = BDADDR_ANY;
1119         struct l2cap_chan *pchan;
1120         int err;
1121
1122         if (psm_6lowpan == 0)
1123                 return NULL;
1124
1125         pchan = chan_get();
1126         if (!pchan)
1127                 return NULL;
1128
1129         pchan->state = BT_LISTEN;
1130         pchan->src_type = BDADDR_LE_PUBLIC;
1131
1132         atomic_set(&pchan->nesting, L2CAP_NESTING_PARENT);
1133
1134         BT_DBG("psm 0x%04x chan %p src type %d", psm_6lowpan, pchan,
1135                pchan->src_type);
1136
1137         err = l2cap_add_psm(pchan, addr, cpu_to_le16(psm_6lowpan));
1138         if (err) {
1139                 l2cap_chan_put(pchan);
1140                 BT_ERR("psm cannot be added err %d", err);
1141                 return NULL;
1142         }
1143
1144         return pchan;
1145 }
1146
1147 static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type,
1148                           struct l2cap_conn **conn)
1149 {
1150         struct hci_conn *hcon;
1151         struct hci_dev *hdev;
1152         bdaddr_t *src = BDADDR_ANY;
1153         int n;
1154
1155         n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu",
1156                    &addr->b[5], &addr->b[4], &addr->b[3],
1157                    &addr->b[2], &addr->b[1], &addr->b[0],
1158                    addr_type);
1159
1160         if (n < 7)
1161                 return -EINVAL;
1162
1163         hdev = hci_get_route(addr, src);
1164         if (!hdev)
1165                 return -ENOENT;
1166
1167         hci_dev_lock(hdev);
1168         hcon = hci_conn_hash_lookup_ba(hdev, LE_LINK, addr);
1169         hci_dev_unlock(hdev);
1170
1171         if (!hcon)
1172                 return -ENOENT;
1173
1174         *conn = (struct l2cap_conn *)hcon->l2cap_data;
1175
1176         BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type);
1177
1178         return 0;
1179 }
1180
1181 static void disconnect_all_peers(void)
1182 {
1183         struct lowpan_dev *entry;
1184         struct lowpan_peer *peer, *tmp_peer, *new_peer;
1185         struct list_head peers;
1186
1187         INIT_LIST_HEAD(&peers);
1188
1189         /* We make a separate list of peers as the close_cb() will
1190          * modify the device peers list so it is better not to mess
1191          * with the same list at the same time.
1192          */
1193
1194         rcu_read_lock();
1195
1196         list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
1197                 list_for_each_entry_rcu(peer, &entry->peers, list) {
1198                         new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC);
1199                         if (!new_peer)
1200                                 break;
1201
1202                         new_peer->chan = peer->chan;
1203                         INIT_LIST_HEAD(&new_peer->list);
1204
1205                         list_add(&new_peer->list, &peers);
1206                 }
1207         }
1208
1209         rcu_read_unlock();
1210
1211         spin_lock(&devices_lock);
1212         list_for_each_entry_safe(peer, tmp_peer, &peers, list) {
1213                 l2cap_chan_close(peer->chan, ENOENT);
1214
1215                 list_del_rcu(&peer->list);
1216                 kfree_rcu(peer, rcu);
1217
1218                 module_put(THIS_MODULE);
1219         }
1220         spin_unlock(&devices_lock);
1221 }
1222
1223 struct set_psm {
1224         struct work_struct work;
1225         u16 psm;
1226 };
1227
1228 static void do_psm_set(struct work_struct *work)
1229 {
1230         struct set_psm *set_psm = container_of(work, struct set_psm, work);
1231
1232         if (set_psm->psm == 0 || psm_6lowpan != set_psm->psm)
1233                 /* Disconnect existing connections if 6lowpan is
1234                  * disabled (psm = 0), or if psm changes.
1235                  */
1236                 disconnect_all_peers();
1237
1238         psm_6lowpan = set_psm->psm;
1239
1240         if (listen_chan) {
1241                 l2cap_chan_close(listen_chan, 0);
1242                 l2cap_chan_put(listen_chan);
1243         }
1244
1245         listen_chan = bt_6lowpan_listen();
1246
1247         kfree(set_psm);
1248 }
1249
1250 static int lowpan_psm_set(void *data, u64 val)
1251 {
1252         struct set_psm *set_psm;
1253
1254         set_psm = kzalloc(sizeof(*set_psm), GFP_KERNEL);
1255         if (!set_psm)
1256                 return -ENOMEM;
1257
1258         set_psm->psm = val;
1259         INIT_WORK(&set_psm->work, do_psm_set);
1260
1261         schedule_work(&set_psm->work);
1262
1263         return 0;
1264 }
1265
1266 static int lowpan_psm_get(void *data, u64 *val)
1267 {
1268         *val = psm_6lowpan;
1269         return 0;
1270 }
1271
1272 DEFINE_SIMPLE_ATTRIBUTE(lowpan_psm_fops, lowpan_psm_get,
1273                         lowpan_psm_set, "%llu\n");
1274
1275 static ssize_t lowpan_control_write(struct file *fp,
1276                                     const char __user *user_buffer,
1277                                     size_t count,
1278                                     loff_t *position)
1279 {
1280         char buf[32];
1281         size_t buf_size = min(count, sizeof(buf) - 1);
1282         int ret;
1283         bdaddr_t addr;
1284         u8 addr_type;
1285         struct l2cap_conn *conn = NULL;
1286
1287         if (copy_from_user(buf, user_buffer, buf_size))
1288                 return -EFAULT;
1289
1290         buf[buf_size] = '\0';
1291
1292         if (memcmp(buf, "connect ", 8) == 0) {
1293                 ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn);
1294                 if (ret == -EINVAL)
1295                         return ret;
1296
1297                 if (listen_chan) {
1298                         l2cap_chan_close(listen_chan, 0);
1299                         l2cap_chan_put(listen_chan);
1300                         listen_chan = NULL;
1301                 }
1302
1303                 if (conn) {
1304                         struct lowpan_peer *peer;
1305
1306                         if (!is_bt_6lowpan(conn->hcon))
1307                                 return -EINVAL;
1308
1309                         peer = lookup_peer(conn);
1310                         if (peer) {
1311                                 BT_DBG("6LoWPAN connection already exists");
1312                                 return -EALREADY;
1313                         }
1314
1315                         BT_DBG("conn %p dst %pMR type %d user %d", conn,
1316                                &conn->hcon->dst, conn->hcon->dst_type,
1317                                addr_type);
1318                 }
1319
1320                 ret = bt_6lowpan_connect(&addr, addr_type);
1321                 if (ret < 0)
1322                         return ret;
1323
1324                 return count;
1325         }
1326
1327         if (memcmp(buf, "disconnect ", 11) == 0) {
1328                 ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn);
1329                 if (ret < 0)
1330                         return ret;
1331
1332                 ret = bt_6lowpan_disconnect(conn, addr_type);
1333                 if (ret < 0)
1334                         return ret;
1335
1336                 return count;
1337         }
1338
1339         return count;
1340 }
1341
1342 static int lowpan_control_show(struct seq_file *f, void *ptr)
1343 {
1344         struct lowpan_dev *entry;
1345         struct lowpan_peer *peer;
1346
1347         spin_lock(&devices_lock);
1348
1349         list_for_each_entry(entry, &bt_6lowpan_devices, list) {
1350                 list_for_each_entry(peer, &entry->peers, list)
1351                         seq_printf(f, "%pMR (type %u)\n",
1352                                    &peer->chan->dst, peer->chan->dst_type);
1353         }
1354
1355         spin_unlock(&devices_lock);
1356
1357         return 0;
1358 }
1359
1360 static int lowpan_control_open(struct inode *inode, struct file *file)
1361 {
1362         return single_open(file, lowpan_control_show, inode->i_private);
1363 }
1364
1365 static const struct file_operations lowpan_control_fops = {
1366         .open           = lowpan_control_open,
1367         .read           = seq_read,
1368         .write          = lowpan_control_write,
1369         .llseek         = seq_lseek,
1370         .release        = single_release,
1371 };
1372
1373 static void disconnect_devices(void)
1374 {
1375         struct lowpan_dev *entry, *tmp, *new_dev;
1376         struct list_head devices;
1377
1378         INIT_LIST_HEAD(&devices);
1379
1380         /* We make a separate list of devices because the unregister_netdev()
1381          * will call device_event() which will also want to modify the same
1382          * devices list.
1383          */
1384
1385         rcu_read_lock();
1386
1387         list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
1388                 new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC);
1389                 if (!new_dev)
1390                         break;
1391
1392                 new_dev->netdev = entry->netdev;
1393                 INIT_LIST_HEAD(&new_dev->list);
1394
1395                 list_add_rcu(&new_dev->list, &devices);
1396         }
1397
1398         rcu_read_unlock();
1399
1400         list_for_each_entry_safe(entry, tmp, &devices, list) {
1401                 ifdown(entry->netdev);
1402                 BT_DBG("Unregistering netdev %s %p",
1403                        entry->netdev->name, entry->netdev);
1404                 unregister_netdev(entry->netdev);
1405                 kfree(entry);
1406         }
1407 }
1408
1409 static int device_event(struct notifier_block *unused,
1410                         unsigned long event, void *ptr)
1411 {
1412         struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
1413         struct lowpan_dev *entry;
1414
1415         if (netdev->type != ARPHRD_6LOWPAN)
1416                 return NOTIFY_DONE;
1417
1418         switch (event) {
1419         case NETDEV_UNREGISTER:
1420                 spin_lock(&devices_lock);
1421                 list_for_each_entry(entry, &bt_6lowpan_devices, list) {
1422                         if (entry->netdev == netdev) {
1423                                 BT_DBG("Unregistered netdev %s %p",
1424                                        netdev->name, netdev);
1425                                 list_del(&entry->list);
1426                                 kfree(entry);
1427                                 break;
1428                         }
1429                 }
1430                 spin_unlock(&devices_lock);
1431                 break;
1432         }
1433
1434         return NOTIFY_DONE;
1435 }
1436
1437 static struct notifier_block bt_6lowpan_dev_notifier = {
1438         .notifier_call = device_event,
1439 };
1440
1441 static int __init bt_6lowpan_init(void)
1442 {
1443         lowpan_psm_debugfs = debugfs_create_file("6lowpan_psm", 0644,
1444                                                  bt_debugfs, NULL,
1445                                                  &lowpan_psm_fops);
1446         lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644,
1447                                                      bt_debugfs, NULL,
1448                                                      &lowpan_control_fops);
1449
1450         return register_netdevice_notifier(&bt_6lowpan_dev_notifier);
1451 }
1452
1453 static void __exit bt_6lowpan_exit(void)
1454 {
1455         debugfs_remove(lowpan_psm_debugfs);
1456         debugfs_remove(lowpan_control_debugfs);
1457
1458         if (listen_chan) {
1459                 l2cap_chan_close(listen_chan, 0);
1460                 l2cap_chan_put(listen_chan);
1461         }
1462
1463         disconnect_devices();
1464
1465         unregister_netdevice_notifier(&bt_6lowpan_dev_notifier);
1466 }
1467
1468 module_init(bt_6lowpan_init);
1469 module_exit(bt_6lowpan_exit);
1470
1471 MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>");
1472 MODULE_DESCRIPTION("Bluetooth 6LoWPAN");
1473 MODULE_VERSION(VERSION);
1474 MODULE_LICENSE("GPL");