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_RWLOCK(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 l2cap_chan *chan;
  71
  72         /* peer addresses in various formats */
  73         unsigned char eui64_addr[EUI64_ADDR_LEN];
  74         struct in6_addr peer_addr;
  75 };
  76
  77 struct lowpan_dev {
  78         struct list_head list;
  79
  80         struct hci_dev *hdev;
  81         struct net_device *netdev;
  82         struct list_head peers;
  83         atomic_t peer_count; /* number of items in peers list */
  84
  85         struct work_struct delete_netdev;
  86         struct delayed_work notify_peers;
  87 };
  88
  89 static inline struct lowpan_dev *lowpan_dev(const struct net_device *netdev)
  90 {
  91         return netdev_priv(netdev);
  92 }
  93
  94 static inline void peer_add(struct lowpan_dev *dev, struct lowpan_peer *peer)
  95 {
  96         list_add(&peer->list, &dev->peers);
  97         atomic_inc(&dev->peer_count);
  98 }
  99
 100 static inline bool peer_del(struct lowpan_dev *dev, struct lowpan_peer *peer)
 101 {
 102         list_del(&peer->list);
 103
 104         module_put(THIS_MODULE);
 105
 106         if (atomic_dec_and_test(&dev->peer_count)) {
 107                 BT_DBG("last peer");
 108                 return true;
 109         }
 110
 111         return false;
 112 }
 113
 114 static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_dev *dev,
 115                                                  bdaddr_t *ba, __u8 type)
 116 {
 117         struct lowpan_peer *peer, *tmp;
 118
 119         BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count),
 120                ba, type);
 121
 122         list_for_each_entry_safe(peer, tmp, &dev->peers, list) {
 123                 BT_DBG("dst addr %pMR dst type %d",
 124                        &peer->chan->dst, peer->chan->dst_type);
 125
 126                 if (bacmp(&peer->chan->dst, ba))
 127                         continue;
 128
 129                 if (type == peer->chan->dst_type)
 130                         return peer;
 131         }
 132
 133         return NULL;
 134 }
 135
 136 static inline struct lowpan_peer *peer_lookup_chan(struct lowpan_dev *dev,
 137                                                    struct l2cap_chan *chan)
 138 {
 139         struct lowpan_peer *peer, *tmp;
 140
 141         list_for_each_entry_safe(peer, tmp, &dev->peers, list) {
 142                 if (peer->chan == chan)
 143                         return peer;
 144         }
 145
 146         return NULL;
 147 }
 148
 149 static inline struct lowpan_peer *peer_lookup_conn(struct lowpan_dev *dev,
 150                                                    struct l2cap_conn *conn)
 151 {
 152         struct lowpan_peer *peer, *tmp;
 153
 154         list_for_each_entry_safe(peer, tmp, &dev->peers, list) {
 155                 if (peer->chan->conn == conn)
 156                         return peer;
 157         }
 158
 159         return NULL;
 160 }
 161
 162 static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_dev *dev,
 163                                                   struct in6_addr *daddr,
 164                                                   struct sk_buff *skb)
 165 {
 166         struct lowpan_peer *peer, *tmp;
 167         struct in6_addr *nexthop;
 168         struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
 169         int count = atomic_read(&dev->peer_count);
 170
 171         BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt);
 172
 173         /* If we have multiple 6lowpan peers, then check where we should
 174          * send the packet. If only one peer exists, then we can send the
 175          * packet right away.
 176          */
 177         if (count == 1)
 178                 return list_first_entry(&dev->peers, struct lowpan_peer,
 179                                         list);
 180
 181         if (!rt) {
 182                 nexthop = &lowpan_cb(skb)->gw;
 183
 184                 if (ipv6_addr_any(nexthop))
 185                         return NULL;
 186         } else {
 187                 nexthop = rt6_nexthop(rt);
 188
 189                 /* We need to remember the address because it is needed
 190                  * by bt_xmit() when sending the packet. In bt_xmit(), the
 191                  * destination routing info is not set.
 192                  */
 193                 memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr));
 194         }
 195
 196         BT_DBG("gw %pI6c", nexthop);
 197
 198         list_for_each_entry_safe(peer, tmp, &dev->peers, list) {
 199                 BT_DBG("dst addr %pMR dst type %d ip %pI6c",
 200                        &peer->chan->dst, peer->chan->dst_type,
 201                        &peer->peer_addr);
 202
 203                 if (!ipv6_addr_cmp(&peer->peer_addr, nexthop))
 204                         return peer;
 205         }
 206
 207         return NULL;
 208 }
 209
 210 static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn)
 211 {
 212         struct lowpan_dev *entry, *tmp;
 213         struct lowpan_peer *peer = NULL;
 214         unsigned long flags;
 215
 216         read_lock_irqsave(&devices_lock, flags);
 217
 218         list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
 219                 peer = peer_lookup_conn(entry, conn);
 220                 if (peer)
 221                         break;
 222         }
 223
 224         read_unlock_irqrestore(&devices_lock, flags);
 225
 226         return peer;
 227 }
 228
 229 static struct lowpan_dev *lookup_dev(struct l2cap_conn *conn)
 230 {
 231         struct lowpan_dev *entry, *tmp;
 232         struct lowpan_dev *dev = NULL;
 233         unsigned long flags;
 234
 235         read_lock_irqsave(&devices_lock, flags);
 236
 237         list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
 238                 if (conn->hcon->hdev == entry->hdev) {
 239                         dev = entry;
 240                         break;
 241                 }
 242         }
 243
 244         read_unlock_irqrestore(&devices_lock, flags);
 245
 246         return dev;
 247 }
 248
 249 static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev)
 250 {
 251         struct sk_buff *skb_cp;
 252         int ret;
 253
 254         skb_cp = skb_copy(skb, GFP_ATOMIC);
 255         if (!skb_cp)
 256                 return -ENOMEM;
 257
 258         ret = netif_rx(skb_cp);
 259         if (ret < 0) {
 260                 BT_DBG("receive skb %d", ret);
 261                 return NET_RX_DROP;
 262         }
 263
 264         return ret;
 265 }
 266
 267 static int process_data(struct sk_buff *skb, struct net_device *netdev,
 268                         struct l2cap_chan *chan)
 269 {
 270         const u8 *saddr, *daddr;
 271         u8 iphc0, iphc1;
 272         struct lowpan_dev *dev;
 273         struct lowpan_peer *peer;
 274         unsigned long flags;
 275
 276         dev = lowpan_dev(netdev);
 277
 278         read_lock_irqsave(&devices_lock, flags);
 279         peer = peer_lookup_chan(dev, chan);
 280         read_unlock_irqrestore(&devices_lock, flags);
 281         if (!peer)
 282                 goto drop;
 283
 284         saddr = peer->eui64_addr;
 285         daddr = dev->netdev->dev_addr;
 286
 287         /* at least two bytes will be used for the encoding */
 288         if (skb->len < 2)
 289                 goto drop;
 290
 291         if (lowpan_fetch_skb_u8(skb, &iphc0))
 292                 goto drop;
 293
 294         if (lowpan_fetch_skb_u8(skb, &iphc1))
 295                 goto drop;
 296
 297         return lowpan_process_data(skb, netdev,
 298                                    saddr, IEEE802154_ADDR_LONG, EUI64_ADDR_LEN,
 299                                    daddr, IEEE802154_ADDR_LONG, EUI64_ADDR_LEN,
 300                                    iphc0, iphc1, give_skb_to_upper);
 301
 302 drop:
 303         kfree_skb(skb);
 304         return -EINVAL;
 305 }
 306
 307 static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
 308                     struct l2cap_chan *chan)
 309 {
 310         struct sk_buff *local_skb;
 311         int ret;
 312
 313         if (!netif_running(dev))
 314                 goto drop;
 315
 316         if (dev->type != ARPHRD_6LOWPAN)
 317                 goto drop;
 318
 319         /* check that it's our buffer */
 320         if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
 321                 /* Copy the packet so that the IPv6 header is
 322                  * properly aligned.
 323                  */
 324                 local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1,
 325                                             skb_tailroom(skb), GFP_ATOMIC);
 326                 if (!local_skb)
 327                         goto drop;
 328
 329                 local_skb->protocol = htons(ETH_P_IPV6);
 330                 local_skb->pkt_type = PACKET_HOST;
 331
 332                 skb_reset_network_header(local_skb);
 333                 skb_set_transport_header(local_skb, sizeof(struct ipv6hdr));
 334
 335                 if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) {
 336                         kfree_skb(local_skb);
 337                         goto drop;
 338                 }
 339
 340                 dev->stats.rx_bytes += skb->len;
 341                 dev->stats.rx_packets++;
 342
 343                 kfree_skb(local_skb);
 344                 kfree_skb(skb);
 345         } else {
 346                 switch (skb->data[0] & 0xe0) {
 347                 case LOWPAN_DISPATCH_IPHC:      /* ipv6 datagram */
 348                         local_skb = skb_clone(skb, GFP_ATOMIC);
 349                         if (!local_skb)
 350                                 goto drop;
 351
 352                         ret = process_data(local_skb, dev, chan);
 353                         if (ret != NET_RX_SUCCESS)
 354                                 goto drop;
 355
 356                         dev->stats.rx_bytes += skb->len;
 357                         dev->stats.rx_packets++;
 358
 359                         kfree_skb(skb);
 360                         break;
 361                 default:
 362                         break;
 363                 }
 364         }
 365
 366         return NET_RX_SUCCESS;
 367
 368 drop:
 369         dev->stats.rx_dropped++;
 370         kfree_skb(skb);
 371         return NET_RX_DROP;
 372 }
 373
 374 /* Packet from BT LE device */
 375 static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
 376 {
 377         struct lowpan_dev *dev;
 378         struct lowpan_peer *peer;
 379         int err;
 380
 381         peer = lookup_peer(chan->conn);
 382         if (!peer)
 383                 return -ENOENT;
 384
 385         dev = lookup_dev(chan->conn);
 386         if (!dev || !dev->netdev)
 387                 return -ENOENT;
 388
 389         err = recv_pkt(skb, dev->netdev, chan);
 390         if (err) {
 391                 BT_DBG("recv pkt %d", err);
 392                 err = -EAGAIN;
 393         }
 394
 395         return err;
 396 }
 397
 398 static u8 get_addr_type_from_eui64(u8 byte)
 399 {
 400         /* Is universal(0) or local(1) bit */
 401         return ((byte & 0x02) ? BDADDR_LE_RANDOM : BDADDR_LE_PUBLIC);
 402 }
 403
 404 static void copy_to_bdaddr(struct in6_addr *ip6_daddr, bdaddr_t *addr)
 405 {
 406         u8 *eui64 = ip6_daddr->s6_addr + 8;
 407
 408         addr->b[0] = eui64[7];
 409         addr->b[1] = eui64[6];
 410         addr->b[2] = eui64[5];
 411         addr->b[3] = eui64[2];
 412         addr->b[4] = eui64[1];
 413         addr->b[5] = eui64[0];
 414 }
 415
 416 static void convert_dest_bdaddr(struct in6_addr *ip6_daddr,
 417                                 bdaddr_t *addr, u8 *addr_type)
 418 {
 419         copy_to_bdaddr(ip6_daddr, addr);
 420
 421         /* We need to toggle the U/L bit that we got from IPv6 address
 422          * so that we get the proper address and type of the BD address.
 423          */
 424         addr->b[5] ^= 0x02;
 425
 426         *addr_type = get_addr_type_from_eui64(addr->b[5]);
 427 }
 428
 429 static int setup_header(struct sk_buff *skb, struct net_device *netdev,
 430                         bdaddr_t *peer_addr, u8 *peer_addr_type)
 431 {
 432         struct in6_addr ipv6_daddr;
 433         struct lowpan_dev *dev;
 434         struct lowpan_peer *peer;
 435         bdaddr_t addr, *any = BDADDR_ANY;
 436         u8 *daddr = any->b;
 437         int err, status = 0;
 438
 439         dev = lowpan_dev(netdev);
 440
 441         memcpy(&ipv6_daddr, &lowpan_cb(skb)->addr, sizeof(ipv6_daddr));
 442
 443         if (ipv6_addr_is_multicast(&ipv6_daddr)) {
 444                 lowpan_cb(skb)->chan = NULL;
 445         } else {
 446                 unsigned long flags;
 447                 u8 addr_type;
 448
 449                 /* Get destination BT device from skb.
 450                  * If there is no such peer then discard the packet.
 451                  */
 452                 convert_dest_bdaddr(&ipv6_daddr, &addr, &addr_type);
 453
 454                 BT_DBG("dest addr %pMR type %d IP %pI6c", &addr,
 455                        addr_type, &ipv6_daddr);
 456
 457                 read_lock_irqsave(&devices_lock, flags);
 458                 peer = peer_lookup_ba(dev, &addr, addr_type);
 459                 read_unlock_irqrestore(&devices_lock, flags);
 460
 461                 if (!peer) {
 462                         /* The packet might be sent to 6lowpan interface
 463                          * because of routing (either via default route
 464                          * or user set route) so get peer according to
 465                          * the destination address.
 466                          */
 467                         read_lock_irqsave(&devices_lock, flags);
 468                         peer = peer_lookup_dst(dev, &ipv6_daddr, skb);
 469                         read_unlock_irqrestore(&devices_lock, flags);
 470                         if (!peer) {
 471                                 BT_DBG("no such peer %pMR found", &addr);
 472                                 return -ENOENT;
 473                         }
 474                 }
 475
 476                 daddr = peer->eui64_addr;
 477                 *peer_addr = addr;
 478                 *peer_addr_type = addr_type;
 479                 lowpan_cb(skb)->chan = peer->chan;
 480
 481                 status = 1;
 482         }
 483
 484         lowpan_header_compress(skb, netdev, ETH_P_IPV6, daddr,
 485                                dev->netdev->dev_addr, skb->len);
 486
 487         err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0);
 488         if (err < 0)
 489                 return err;
 490
 491         return status;
 492 }
 493
 494 static int header_create(struct sk_buff *skb, struct net_device *netdev,
 495                          unsigned short type, const void *_daddr,
 496                          const void *_saddr, unsigned int len)
 497 {
 498         struct ipv6hdr *hdr;
 499
 500         if (type != ETH_P_IPV6)
 501                 return -EINVAL;
 502
 503         hdr = ipv6_hdr(skb);
 504
 505         memcpy(&lowpan_cb(skb)->addr, &hdr->daddr, sizeof(struct in6_addr));
 506
 507         return 0;
 508 }
 509
 510 /* Packet to BT LE device */
 511 static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb,
 512                     struct net_device *netdev)
 513 {
 514         struct msghdr msg;
 515         struct kvec iv;
 516         int err;
 517
 518         /* Remember the skb so that we can send EAGAIN to the caller if
 519          * we run out of credits.
 520          */
 521         chan->data = skb;
 522
 523         memset(&msg, 0, sizeof(msg));
 524         msg.msg_iov = (struct iovec *) &iv;
 525         msg.msg_iovlen = 1;
 526         iv.iov_base = skb->data;
 527         iv.iov_len = skb->len;
 528
 529         err = l2cap_chan_send(chan, &msg, skb->len);
 530         if (err > 0) {
 531                 netdev->stats.tx_bytes += err;
 532                 netdev->stats.tx_packets++;
 533                 return 0;
 534         }
 535
 536         if (!err)
 537                 err = lowpan_cb(skb)->status;
 538
 539         if (err < 0) {
 540                 if (err == -EAGAIN)
 541                         netdev->stats.tx_dropped++;
 542                 else
 543                         netdev->stats.tx_errors++;
 544         }
 545
 546         return err;
 547 }
 548
 549 static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev)
 550 {
 551         struct sk_buff *local_skb;
 552         struct lowpan_dev *entry, *tmp;
 553         unsigned long flags;
 554         int err = 0;
 555
 556         read_lock_irqsave(&devices_lock, flags);
 557
 558         list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
 559                 struct lowpan_peer *pentry, *ptmp;
 560                 struct lowpan_dev *dev;
 561
 562                 if (entry->netdev != netdev)
 563                         continue;
 564
 565                 dev = lowpan_dev(entry->netdev);
 566
 567                 list_for_each_entry_safe(pentry, ptmp, &dev->peers, list) {
 568                         int ret;
 569
 570                         local_skb = skb_clone(skb, GFP_ATOMIC);
 571
 572                         BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
 573                                netdev->name,
 574                                &pentry->chan->dst, pentry->chan->dst_type,
 575                                &pentry->peer_addr, pentry->chan);
 576                         ret = send_pkt(pentry->chan, local_skb, netdev);
 577                         if (ret < 0)
 578                                 err = ret;
 579
 580                         kfree_skb(local_skb);
 581                 }
 582         }
 583
 584         read_unlock_irqrestore(&devices_lock, flags);
 585
 586         return err;
 587 }
 588
 589 static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev)
 590 {
 591         int err = 0;
 592         bdaddr_t addr;
 593         u8 addr_type;
 594         struct sk_buff *tmpskb;
 595
 596         /* We must take a copy of the skb before we modify/replace the ipv6
 597          * header as the header could be used elsewhere
 598          */
 599         tmpskb = skb_unshare(skb, GFP_ATOMIC);
 600         if (!tmpskb) {
 601                 kfree_skb(skb);
 602                 return NET_XMIT_DROP;
 603         }
 604         skb = tmpskb;
 605
 606         /* Return values from setup_header()
 607          *  <0 - error, packet is dropped
 608          *   0 - this is a multicast packet
 609          *   1 - this is unicast packet
 610          */
 611         err = setup_header(skb, netdev, &addr, &addr_type);
 612         if (err < 0) {
 613                 kfree_skb(skb);
 614                 return NET_XMIT_DROP;
 615         }
 616
 617         if (err) {
 618                 if (lowpan_cb(skb)->chan) {
 619                         BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
 620                                netdev->name, &addr, addr_type,
 621                                &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan);
 622                         err = send_pkt(lowpan_cb(skb)->chan, skb, netdev);
 623                 } else {
 624                         err = -ENOENT;
 625                 }
 626         } else {
 627                 /* We need to send the packet to every device behind this
 628                  * interface.
 629                  */
 630                 err = send_mcast_pkt(skb, netdev);
 631         }
 632
 633         dev_kfree_skb(skb);
 634
 635         if (err)
 636                 BT_DBG("ERROR: xmit failed (%d)", err);
 637
 638         return err < 0 ? NET_XMIT_DROP : err;
 639 }
 640
 641 static const struct net_device_ops netdev_ops = {
 642         .ndo_start_xmit         = bt_xmit,
 643 };
 644
 645 static struct header_ops header_ops = {
 646         .create = header_create,
 647 };
 648
 649 static void netdev_setup(struct net_device *dev)
 650 {
 651         dev->addr_len           = EUI64_ADDR_LEN;
 652         dev->type               = ARPHRD_6LOWPAN;
 653
 654         dev->hard_header_len    = 0;
 655         dev->needed_tailroom    = 0;
 656         dev->mtu                = IPV6_MIN_MTU;
 657         dev->tx_queue_len       = 0;
 658         dev->flags              = IFF_RUNNING | IFF_POINTOPOINT |
 659                                   IFF_MULTICAST;
 660         dev->watchdog_timeo     = 0;
 661
 662         dev->netdev_ops         = &netdev_ops;
 663         dev->header_ops         = &header_ops;
 664         dev->destructor         = free_netdev;
 665 }
 666
 667 static struct device_type bt_type = {
 668         .name   = "bluetooth",
 669 };
 670
 671 static void set_addr(u8 *eui, u8 *addr, u8 addr_type)
 672 {
 673         /* addr is the BT address in little-endian format */
 674         eui[0] = addr[5];
 675         eui[1] = addr[4];
 676         eui[2] = addr[3];
 677         eui[3] = 0xFF;
 678         eui[4] = 0xFE;
 679         eui[5] = addr[2];
 680         eui[6] = addr[1];
 681         eui[7] = addr[0];
 682
 683         /* Universal/local bit set, BT 6lowpan draft ch. 3.2.1 */
 684         if (addr_type == BDADDR_LE_PUBLIC)
 685                 eui[0] &= ~0x02;
 686         else
 687                 eui[0] |= 0x02;
 688
 689         BT_DBG("type %d addr %*phC", addr_type, 8, eui);
 690 }
 691
 692 static void set_dev_addr(struct net_device *netdev, bdaddr_t *addr,
 693                          u8 addr_type)
 694 {
 695         netdev->addr_assign_type = NET_ADDR_PERM;
 696         set_addr(netdev->dev_addr, addr->b, addr_type);
 697 }
 698
 699 static void ifup(struct net_device *netdev)
 700 {
 701         int err;
 702
 703         rtnl_lock();
 704         err = dev_open(netdev);
 705         if (err < 0)
 706                 BT_INFO("iface %s cannot be opened (%d)", netdev->name, err);
 707         rtnl_unlock();
 708 }
 709
 710 static void ifdown(struct net_device *netdev)
 711 {
 712         int err;
 713
 714         rtnl_lock();
 715         err = dev_close(netdev);
 716         if (err < 0)
 717                 BT_INFO("iface %s cannot be closed (%d)", netdev->name, err);
 718         rtnl_unlock();
 719 }
 720
 721 static void do_notify_peers(struct work_struct *work)
 722 {
 723         struct lowpan_dev *dev = container_of(work, struct lowpan_dev,
 724                                               notify_peers.work);
 725
 726         netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */
 727 }
 728
 729 static bool is_bt_6lowpan(struct hci_conn *hcon)
 730 {
 731         if (hcon->type != LE_LINK)
 732                 return false;
 733
 734         if (!psm_6lowpan)
 735                 return false;
 736
 737         return true;
 738 }
 739
 740 static struct l2cap_chan *chan_create(void)
 741 {
 742         struct l2cap_chan *chan;
 743
 744         chan = l2cap_chan_create();
 745         if (!chan)
 746                 return NULL;
 747
 748         l2cap_chan_set_defaults(chan);
 749
 750         chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
 751         chan->mode = L2CAP_MODE_LE_FLOWCTL;
 752         chan->omtu = 65535;
 753         chan->imtu = chan->omtu;
 754
 755         return chan;
 756 }
 757
 758 static struct l2cap_chan *chan_open(struct l2cap_chan *pchan)
 759 {
 760         struct l2cap_chan *chan;
 761
 762         chan = chan_create();
 763         if (!chan)
 764                 return NULL;
 765
 766         chan->remote_mps = chan->omtu;
 767         chan->mps = chan->omtu;
 768
 769         chan->state = BT_CONNECTED;
 770
 771         return chan;
 772 }
 773
 774 static void set_ip_addr_bits(u8 addr_type, u8 *addr)
 775 {
 776         if (addr_type == BDADDR_LE_PUBLIC)
 777                 *addr |= 0x02;
 778         else
 779                 *addr &= ~0x02;
 780 }
 781
 782 static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan,
 783                                         struct lowpan_dev *dev)
 784 {
 785         struct lowpan_peer *peer;
 786         unsigned long flags;
 787
 788         peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
 789         if (!peer)
 790                 return NULL;
 791
 792         peer->chan = chan;
 793         memset(&peer->peer_addr, 0, sizeof(struct in6_addr));
 794
 795         /* RFC 2464 ch. 5 */
 796         peer->peer_addr.s6_addr[0] = 0xFE;
 797         peer->peer_addr.s6_addr[1] = 0x80;
 798         set_addr((u8 *)&peer->peer_addr.s6_addr + 8, chan->dst.b,
 799                  chan->dst_type);
 800
 801         memcpy(&peer->eui64_addr, (u8 *)&peer->peer_addr.s6_addr + 8,
 802                EUI64_ADDR_LEN);
 803
 804         /* IPv6 address needs to have the U/L bit set properly so toggle
 805          * it back here.
 806          */
 807         set_ip_addr_bits(chan->dst_type, (u8 *)&peer->peer_addr.s6_addr + 8);
 808
 809         write_lock_irqsave(&devices_lock, flags);
 810         INIT_LIST_HEAD(&peer->list);
 811         peer_add(dev, peer);
 812         write_unlock_irqrestore(&devices_lock, flags);
 813
 814         /* Notifying peers about us needs to be done without locks held */
 815         INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers);
 816         schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100));
 817
 818         return peer->chan;
 819 }
 820
 821 static int setup_netdev(struct l2cap_chan *chan, struct lowpan_dev **dev)
 822 {
 823         struct net_device *netdev;
 824         int err = 0;
 825         unsigned long flags;
 826
 827         netdev = alloc_netdev(sizeof(struct lowpan_dev), IFACE_NAME_TEMPLATE,
 828                               NET_NAME_UNKNOWN, netdev_setup);
 829         if (!netdev)
 830                 return -ENOMEM;
 831
 832         set_dev_addr(netdev, &chan->src, chan->src_type);
 833
 834         netdev->netdev_ops = &netdev_ops;
 835         SET_NETDEV_DEV(netdev, &chan->conn->hcon->dev);
 836         SET_NETDEV_DEVTYPE(netdev, &bt_type);
 837
 838         err = register_netdev(netdev);
 839         if (err < 0) {
 840                 BT_INFO("register_netdev failed %d", err);
 841                 free_netdev(netdev);
 842                 goto out;
 843         }
 844
 845         BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d",
 846                netdev->ifindex, &chan->dst, chan->dst_type,
 847                &chan->src, chan->src_type);
 848         set_bit(__LINK_STATE_PRESENT, &netdev->state);
 849
 850         *dev = netdev_priv(netdev);
 851         (*dev)->netdev = netdev;
 852         (*dev)->hdev = chan->conn->hcon->hdev;
 853         INIT_LIST_HEAD(&(*dev)->peers);
 854
 855         write_lock_irqsave(&devices_lock, flags);
 856         INIT_LIST_HEAD(&(*dev)->list);
 857         list_add(&(*dev)->list, &bt_6lowpan_devices);
 858         write_unlock_irqrestore(&devices_lock, flags);
 859
 860         return 0;
 861
 862 out:
 863         return err;
 864 }
 865
 866 static inline void chan_ready_cb(struct l2cap_chan *chan)
 867 {
 868         struct lowpan_dev *dev;
 869
 870         dev = lookup_dev(chan->conn);
 871
 872         BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev);
 873
 874         if (!dev) {
 875                 if (setup_netdev(chan, &dev) < 0) {
 876                         l2cap_chan_del(chan, -ENOENT);
 877                         return;
 878                 }
 879         }
 880
 881         if (!try_module_get(THIS_MODULE))
 882                 return;
 883
 884         add_peer_chan(chan, dev);
 885         ifup(dev->netdev);
 886 }
 887
 888 static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan)
 889 {
 890         struct l2cap_chan *chan;
 891
 892         chan = chan_open(pchan);
 893         chan->ops = pchan->ops;
 894
 895         BT_DBG("chan %p pchan %p", chan, pchan);
 896
 897         return chan;
 898 }
 899
 900 static void delete_netdev(struct work_struct *work)
 901 {
 902         struct lowpan_dev *entry = container_of(work, struct lowpan_dev,
 903                                                 delete_netdev);
 904
 905         unregister_netdev(entry->netdev);
 906
 907         /* The entry pointer is deleted in device_event() */
 908 }
 909
 910 static void chan_close_cb(struct l2cap_chan *chan)
 911 {
 912         struct lowpan_dev *entry, *tmp;
 913         struct lowpan_dev *dev = NULL;
 914         struct lowpan_peer *peer;
 915         int err = -ENOENT;
 916         unsigned long flags;
 917         bool last = false, removed = true;
 918
 919         BT_DBG("chan %p conn %p", chan, chan->conn);
 920
 921         if (chan->conn && chan->conn->hcon) {
 922                 if (!is_bt_6lowpan(chan->conn->hcon))
 923                         return;
 924
 925                 /* If conn is set, then the netdev is also there and we should
 926                  * not remove it.
 927                  */
 928                 removed = false;
 929         }
 930
 931         write_lock_irqsave(&devices_lock, flags);
 932
 933         list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
 934                 dev = lowpan_dev(entry->netdev);
 935                 peer = peer_lookup_chan(dev, chan);
 936                 if (peer) {
 937                         last = peer_del(dev, peer);
 938                         err = 0;
 939
 940                         BT_DBG("dev %p removing %speer %p", dev,
 941                                last ? "last " : "1 ", peer);
 942                         BT_DBG("chan %p orig refcnt %d", chan,
 943                                atomic_read(&chan->kref.refcount));
 944
 945                         l2cap_chan_put(chan);
 946                         kfree(peer);
 947                         break;
 948                 }
 949         }
 950
 951         if (!err && last && dev && !atomic_read(&dev->peer_count)) {
 952                 write_unlock_irqrestore(&devices_lock, flags);
 953
 954                 cancel_delayed_work_sync(&dev->notify_peers);
 955
 956                 ifdown(dev->netdev);
 957
 958                 if (!removed) {
 959                         INIT_WORK(&entry->delete_netdev, delete_netdev);
 960                         schedule_work(&entry->delete_netdev);
 961                 }
 962         } else {
 963                 write_unlock_irqrestore(&devices_lock, flags);
 964         }
 965
 966         return;
 967 }
 968
 969 static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err)
 970 {
 971         BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn,
 972                state_to_string(state), err);
 973 }
 974
 975 static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan,
 976                                          unsigned long hdr_len,
 977                                          unsigned long len, int nb)
 978 {
 979         /* Note that we must allocate using GFP_ATOMIC here as
 980          * this function is called originally from netdev hard xmit
 981          * function in atomic context.
 982          */
 983         return bt_skb_alloc(hdr_len + len, GFP_ATOMIC);
 984 }
 985
 986 static void chan_suspend_cb(struct l2cap_chan *chan)
 987 {
 988         struct sk_buff *skb = chan->data;
 989
 990         BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb);
 991
 992         if (!skb)
 993                 return;
 994
 995         lowpan_cb(skb)->status = -EAGAIN;
 996 }
 997
 998 static void chan_resume_cb(struct l2cap_chan *chan)
 999 {
1000         struct sk_buff *skb = chan->data;
1001
1002         BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb);
1003
1004         if (!skb)
1005                 return;
1006
1007         lowpan_cb(skb)->status = 0;
1008 }
1009
1010 static long chan_get_sndtimeo_cb(struct l2cap_chan *chan)
1011 {
1012         return L2CAP_CONN_TIMEOUT;
1013 }
1014
1015 static const struct l2cap_ops bt_6lowpan_chan_ops = {
1016         .name                   = "L2CAP 6LoWPAN channel",
1017         .new_connection         = chan_new_conn_cb,
1018         .recv                   = chan_recv_cb,
1019         .close                  = chan_close_cb,
1020         .state_change           = chan_state_change_cb,
1021         .ready                  = chan_ready_cb,
1022         .resume                 = chan_resume_cb,
1023         .suspend                = chan_suspend_cb,
1024         .get_sndtimeo           = chan_get_sndtimeo_cb,
1025         .alloc_skb              = chan_alloc_skb_cb,
1026         .memcpy_fromiovec       = l2cap_chan_no_memcpy_fromiovec,
1027
1028         .teardown               = l2cap_chan_no_teardown,
1029         .defer                  = l2cap_chan_no_defer,
1030         .set_shutdown           = l2cap_chan_no_set_shutdown,
1031 };
1032
1033 static inline __u8 bdaddr_type(__u8 type)
1034 {
1035         if (type == ADDR_LE_DEV_PUBLIC)
1036                 return BDADDR_LE_PUBLIC;
1037         else
1038                 return BDADDR_LE_RANDOM;
1039 }
1040
1041 static struct l2cap_chan *chan_get(void)
1042 {
1043         struct l2cap_chan *pchan;
1044
1045         pchan = chan_create();
1046         if (!pchan)
1047                 return NULL;
1048
1049         pchan->ops = &bt_6lowpan_chan_ops;
1050
1051         return pchan;
1052 }
1053
1054 static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type)
1055 {
1056         struct l2cap_chan *pchan;
1057         int err;
1058
1059         pchan = chan_get();
1060         if (!pchan)
1061                 return -EINVAL;
1062
1063         err = l2cap_chan_connect(pchan, cpu_to_le16(psm_6lowpan), 0,
1064                                  addr, dst_type);
1065
1066         BT_DBG("chan %p err %d", pchan, err);
1067         if (err < 0)
1068                 l2cap_chan_put(pchan);
1069
1070         return err;
1071 }
1072
1073 static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type)
1074 {
1075         struct lowpan_peer *peer;
1076
1077         BT_DBG("conn %p dst type %d", conn, dst_type);
1078
1079         peer = lookup_peer(conn);
1080         if (!peer)
1081                 return -ENOENT;
1082
1083         BT_DBG("peer %p chan %p", peer, peer->chan);
1084
1085         l2cap_chan_close(peer->chan, ENOENT);
1086
1087         return 0;
1088 }
1089
1090 static struct l2cap_chan *bt_6lowpan_listen(void)
1091 {
1092         bdaddr_t *addr = BDADDR_ANY;
1093         struct l2cap_chan *pchan;
1094         int err;
1095
1096         if (psm_6lowpan == 0)
1097                 return NULL;
1098
1099         pchan = chan_get();
1100         if (!pchan)
1101                 return NULL;
1102
1103         pchan->state = BT_LISTEN;
1104         pchan->src_type = BDADDR_LE_PUBLIC;
1105
1106         BT_DBG("psm 0x%04x chan %p src type %d", psm_6lowpan, pchan,
1107                pchan->src_type);
1108
1109         err = l2cap_add_psm(pchan, addr, cpu_to_le16(psm_6lowpan));
1110         if (err) {
1111                 l2cap_chan_put(pchan);
1112                 BT_ERR("psm cannot be added err %d", err);
1113                 return NULL;
1114         }
1115
1116         return pchan;
1117 }
1118
1119 static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type,
1120                           struct l2cap_conn **conn)
1121 {
1122         struct hci_conn *hcon;
1123         struct hci_dev *hdev;
1124         bdaddr_t *src = BDADDR_ANY;
1125         int n;
1126
1127         n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu",
1128                    &addr->b[5], &addr->b[4], &addr->b[3],
1129                    &addr->b[2], &addr->b[1], &addr->b[0],
1130                    addr_type);
1131
1132         if (n < 7)
1133                 return -EINVAL;
1134
1135         hdev = hci_get_route(addr, src);
1136         if (!hdev)
1137                 return -ENOENT;
1138
1139         hci_dev_lock(hdev);
1140         hcon = hci_conn_hash_lookup_ba(hdev, LE_LINK, addr);
1141         hci_dev_unlock(hdev);
1142
1143         if (!hcon)
1144                 return -ENOENT;
1145
1146         *conn = (struct l2cap_conn *)hcon->l2cap_data;
1147
1148         BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type);
1149
1150         return 0;
1151 }
1152
1153 static void disconnect_all_peers(void)
1154 {
1155         struct lowpan_dev *entry, *tmp_dev;
1156         struct lowpan_peer *peer, *tmp_peer, *new_peer;
1157         struct list_head peers;
1158         unsigned long flags;
1159
1160         INIT_LIST_HEAD(&peers);
1161
1162         /* We make a separate list of peers as the close_cb() will
1163          * modify the device peers list so it is better not to mess
1164          * with the same list at the same time.
1165          */
1166
1167         read_lock_irqsave(&devices_lock, flags);
1168
1169         list_for_each_entry_safe(entry, tmp_dev, &bt_6lowpan_devices, list) {
1170                 list_for_each_entry_safe(peer, tmp_peer, &entry->peers, list) {
1171                         new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC);
1172                         if (!new_peer)
1173                                 break;
1174
1175                         new_peer->chan = peer->chan;
1176                         INIT_LIST_HEAD(&new_peer->list);
1177
1178                         list_add(&new_peer->list, &peers);
1179                 }
1180         }
1181
1182         read_unlock_irqrestore(&devices_lock, flags);
1183
1184         list_for_each_entry_safe(peer, tmp_peer, &peers, list) {
1185                 l2cap_chan_close(peer->chan, ENOENT);
1186                 kfree(peer);
1187         }
1188 }
1189
1190 static int lowpan_psm_set(void *data, u64 val)
1191 {
1192         u16 psm;
1193
1194         psm = val;
1195         if (psm == 0 || psm_6lowpan != psm)
1196                 /* Disconnect existing connections if 6lowpan is
1197                  * disabled (psm = 0), or if psm changes.
1198                  */
1199                 disconnect_all_peers();
1200
1201         psm_6lowpan = psm;
1202
1203         if (listen_chan) {
1204                 l2cap_chan_close(listen_chan, 0);
1205                 l2cap_chan_put(listen_chan);
1206         }
1207
1208         listen_chan = bt_6lowpan_listen();
1209
1210         return 0;
1211 }
1212
1213 static int lowpan_psm_get(void *data, u64 *val)
1214 {
1215         *val = psm_6lowpan;
1216         return 0;
1217 }
1218
1219 DEFINE_SIMPLE_ATTRIBUTE(lowpan_psm_fops, lowpan_psm_get,
1220                         lowpan_psm_set, "%llu\n");
1221
1222 static ssize_t lowpan_control_write(struct file *fp,
1223                                     const char __user *user_buffer,
1224                                     size_t count,
1225                                     loff_t *position)
1226 {
1227         char buf[32];
1228         size_t buf_size = min(count, sizeof(buf) - 1);
1229         int ret;
1230         bdaddr_t addr;
1231         u8 addr_type;
1232         struct l2cap_conn *conn = NULL;
1233
1234         if (copy_from_user(buf, user_buffer, buf_size))
1235                 return -EFAULT;
1236
1237         buf[buf_size] = '\0';
1238
1239         if (memcmp(buf, "connect ", 8) == 0) {
1240                 ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn);
1241                 if (ret == -EINVAL)
1242                         return ret;
1243
1244                 if (listen_chan) {
1245                         l2cap_chan_close(listen_chan, 0);
1246                         l2cap_chan_put(listen_chan);
1247                         listen_chan = NULL;
1248                 }
1249
1250                 if (conn) {
1251                         struct lowpan_peer *peer;
1252
1253                         if (!is_bt_6lowpan(conn->hcon))
1254                                 return -EINVAL;
1255
1256                         peer = lookup_peer(conn);
1257                         if (peer) {
1258                                 BT_DBG("6LoWPAN connection already exists");
1259                                 return -EALREADY;
1260                         }
1261
1262                         BT_DBG("conn %p dst %pMR type %d user %d", conn,
1263                                &conn->hcon->dst, conn->hcon->dst_type,
1264                                addr_type);
1265                 }
1266
1267                 ret = bt_6lowpan_connect(&addr, addr_type);
1268                 if (ret < 0)
1269                         return ret;
1270
1271                 return count;
1272         }
1273
1274         if (memcmp(buf, "disconnect ", 11) == 0) {
1275                 ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn);
1276                 if (ret < 0)
1277                         return ret;
1278
1279                 ret = bt_6lowpan_disconnect(conn, addr_type);
1280                 if (ret < 0)
1281                         return ret;
1282
1283                 return count;
1284         }
1285
1286         return count;
1287 }
1288
1289 static int lowpan_control_show(struct seq_file *f, void *ptr)
1290 {
1291         struct lowpan_dev *entry, *tmp_dev;
1292         struct lowpan_peer *peer, *tmp_peer;
1293         unsigned long flags;
1294
1295         read_lock_irqsave(&devices_lock, flags);
1296
1297         list_for_each_entry_safe(entry, tmp_dev, &bt_6lowpan_devices, list) {
1298                 list_for_each_entry_safe(peer, tmp_peer, &entry->peers, list)
1299                         seq_printf(f, "%pMR (type %u)\n",
1300                                    &peer->chan->dst, peer->chan->dst_type);
1301         }
1302
1303         read_unlock_irqrestore(&devices_lock, flags);
1304
1305         return 0;
1306 }
1307
1308 static int lowpan_control_open(struct inode *inode, struct file *file)
1309 {
1310         return single_open(file, lowpan_control_show, inode->i_private);
1311 }
1312
1313 static const struct file_operations lowpan_control_fops = {
1314         .open           = lowpan_control_open,
1315         .read           = seq_read,
1316         .write          = lowpan_control_write,
1317         .llseek         = seq_lseek,
1318         .release        = single_release,
1319 };
1320
1321 static void disconnect_devices(void)
1322 {
1323         struct lowpan_dev *entry, *tmp, *new_dev;
1324         struct list_head devices;
1325         unsigned long flags;
1326
1327         INIT_LIST_HEAD(&devices);
1328
1329         /* We make a separate list of devices because the unregister_netdev()
1330          * will call device_event() which will also want to modify the same
1331          * devices list.
1332          */
1333
1334         read_lock_irqsave(&devices_lock, flags);
1335
1336         list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
1337                 new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC);
1338                 if (!new_dev)
1339                         break;
1340
1341                 new_dev->netdev = entry->netdev;
1342                 INIT_LIST_HEAD(&new_dev->list);
1343
1344                 list_add(&new_dev->list, &devices);
1345         }
1346
1347         read_unlock_irqrestore(&devices_lock, flags);
1348
1349         list_for_each_entry_safe(entry, tmp, &devices, list) {
1350                 ifdown(entry->netdev);
1351                 BT_DBG("Unregistering netdev %s %p",
1352                        entry->netdev->name, entry->netdev);
1353                 unregister_netdev(entry->netdev);
1354                 kfree(entry);
1355         }
1356 }
1357
1358 static int device_event(struct notifier_block *unused,
1359                         unsigned long event, void *ptr)
1360 {
1361         struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
1362         struct lowpan_dev *entry, *tmp;
1363         unsigned long flags;
1364
1365         if (netdev->type != ARPHRD_6LOWPAN)
1366                 return NOTIFY_DONE;
1367
1368         switch (event) {
1369         case NETDEV_UNREGISTER:
1370                 write_lock_irqsave(&devices_lock, flags);
1371                 list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices,
1372                                          list) {
1373                         if (entry->netdev == netdev) {
1374                                 BT_DBG("Unregistered netdev %s %p",
1375                                        netdev->name, netdev);
1376                                 list_del(&entry->list);
1377                                 kfree(entry);
1378                                 break;
1379                         }
1380                 }
1381                 write_unlock_irqrestore(&devices_lock, flags);
1382                 break;
1383         }
1384
1385         return NOTIFY_DONE;
1386 }
1387
1388 static struct notifier_block bt_6lowpan_dev_notifier = {
1389         .notifier_call = device_event,
1390 };
1391
1392 static int __init bt_6lowpan_init(void)
1393 {
1394         lowpan_psm_debugfs = debugfs_create_file("6lowpan_psm", 0644,
1395                                                  bt_debugfs, NULL,
1396                                                  &lowpan_psm_fops);
1397         lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644,
1398                                                      bt_debugfs, NULL,
1399                                                      &lowpan_control_fops);
1400
1401         return register_netdevice_notifier(&bt_6lowpan_dev_notifier);
1402 }
1403
1404 static void __exit bt_6lowpan_exit(void)
1405 {
1406         debugfs_remove(lowpan_psm_debugfs);
1407         debugfs_remove(lowpan_control_debugfs);
1408
1409         if (listen_chan) {
1410                 l2cap_chan_close(listen_chan, 0);
1411                 l2cap_chan_put(listen_chan);
1412         }
1413
1414         disconnect_devices();
1415
1416         unregister_netdevice_notifier(&bt_6lowpan_dev_notifier);
1417 }
1418
1419 module_init(bt_6lowpan_init);
1420 module_exit(bt_6lowpan_exit);
1421
1422 MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>");
1423 MODULE_DESCRIPTION("Bluetooth 6LoWPAN");
1424 MODULE_VERSION(VERSION);
1425 MODULE_LICENSE("GPL");