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TOMOYO Linux Cross Reference
Linux/net/bluetooth/6lowpan.c

Version: ~ [ linux-5.2-rc1 ] ~ [ linux-5.1.2 ] ~ [ linux-5.0.16 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.43 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.119 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.176 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.179 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.139 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.67 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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_enable_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 static bool enable_6lowpan;
 59 
 60 /* We are listening incoming connections via this channel
 61  */
 62 static struct l2cap_chan *listen_chan;
 63 
 64 struct lowpan_peer {
 65         struct list_head list;
 66         struct rcu_head rcu;
 67         struct l2cap_chan *chan;
 68 
 69         /* peer addresses in various formats */
 70         unsigned char eui64_addr[EUI64_ADDR_LEN];
 71         struct in6_addr peer_addr;
 72 };
 73 
 74 struct lowpan_dev {
 75         struct list_head list;
 76 
 77         struct hci_dev *hdev;
 78         struct net_device *netdev;
 79         struct list_head peers;
 80         atomic_t peer_count; /* number of items in peers list */
 81 
 82         struct work_struct delete_netdev;
 83         struct delayed_work notify_peers;
 84 };
 85 
 86 static inline struct lowpan_dev *lowpan_dev(const struct net_device *netdev)
 87 {
 88         return (struct lowpan_dev *)lowpan_priv(netdev)->priv;
 89 }
 90 
 91 static inline void peer_add(struct lowpan_dev *dev, struct lowpan_peer *peer)
 92 {
 93         list_add_rcu(&peer->list, &dev->peers);
 94         atomic_inc(&dev->peer_count);
 95 }
 96 
 97 static inline bool peer_del(struct lowpan_dev *dev, struct lowpan_peer *peer)
 98 {
 99         list_del_rcu(&peer->list);
100         kfree_rcu(peer, rcu);
101 
102         module_put(THIS_MODULE);
103 
104         if (atomic_dec_and_test(&dev->peer_count)) {
105                 BT_DBG("last peer");
106                 return true;
107         }
108 
109         return false;
110 }
111 
112 static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_dev *dev,
113                                                  bdaddr_t *ba, __u8 type)
114 {
115         struct lowpan_peer *peer;
116 
117         BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count),
118                ba, type);
119 
120         rcu_read_lock();
121 
122         list_for_each_entry_rcu(peer, &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                         rcu_read_unlock();
131                         return peer;
132                 }
133         }
134 
135         rcu_read_unlock();
136 
137         return NULL;
138 }
139 
140 static inline struct lowpan_peer *__peer_lookup_chan(struct lowpan_dev *dev,
141                                                      struct l2cap_chan *chan)
142 {
143         struct lowpan_peer *peer;
144 
145         list_for_each_entry_rcu(peer, &dev->peers, list) {
146                 if (peer->chan == chan)
147                         return peer;
148         }
149 
150         return NULL;
151 }
152 
153 static inline struct lowpan_peer *__peer_lookup_conn(struct lowpan_dev *dev,
154                                                      struct l2cap_conn *conn)
155 {
156         struct lowpan_peer *peer;
157 
158         list_for_each_entry_rcu(peer, &dev->peers, list) {
159                 if (peer->chan->conn == conn)
160                         return peer;
161         }
162 
163         return NULL;
164 }
165 
166 static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_dev *dev,
167                                                   struct in6_addr *daddr,
168                                                   struct sk_buff *skb)
169 {
170         struct lowpan_peer *peer;
171         struct in6_addr *nexthop;
172         struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
173         int count = atomic_read(&dev->peer_count);
174 
175         BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt);
176 
177         /* If we have multiple 6lowpan peers, then check where we should
178          * send the packet. If only one peer exists, then we can send the
179          * packet right away.
180          */
181         if (count == 1) {
182                 rcu_read_lock();
183                 peer = list_first_or_null_rcu(&dev->peers, struct lowpan_peer,
184                                               list);
185                 rcu_read_unlock();
186                 return peer;
187         }
188 
189         if (!rt) {
190                 nexthop = &lowpan_cb(skb)->gw;
191 
192                 if (ipv6_addr_any(nexthop))
193                         return NULL;
194         } else {
195                 nexthop = rt6_nexthop(rt, daddr);
196 
197                 /* We need to remember the address because it is needed
198                  * by bt_xmit() when sending the packet. In bt_xmit(), the
199                  * destination routing info is not set.
200                  */
201                 memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr));
202         }
203 
204         BT_DBG("gw %pI6c", nexthop);
205 
206         rcu_read_lock();
207 
208         list_for_each_entry_rcu(peer, &dev->peers, list) {
209                 BT_DBG("dst addr %pMR dst type %d ip %pI6c",
210                        &peer->chan->dst, peer->chan->dst_type,
211                        &peer->peer_addr);
212 
213                 if (!ipv6_addr_cmp(&peer->peer_addr, nexthop)) {
214                         rcu_read_unlock();
215                         return peer;
216                 }
217         }
218 
219         rcu_read_unlock();
220 
221         return NULL;
222 }
223 
224 static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn)
225 {
226         struct lowpan_dev *entry;
227         struct lowpan_peer *peer = NULL;
228 
229         rcu_read_lock();
230 
231         list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
232                 peer = __peer_lookup_conn(entry, conn);
233                 if (peer)
234                         break;
235         }
236 
237         rcu_read_unlock();
238 
239         return peer;
240 }
241 
242 static struct lowpan_dev *lookup_dev(struct l2cap_conn *conn)
243 {
244         struct lowpan_dev *entry;
245         struct lowpan_dev *dev = NULL;
246 
247         rcu_read_lock();
248 
249         list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
250                 if (conn->hcon->hdev == entry->hdev) {
251                         dev = entry;
252                         break;
253                 }
254         }
255 
256         rcu_read_unlock();
257 
258         return dev;
259 }
260 
261 static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev)
262 {
263         struct sk_buff *skb_cp;
264 
265         skb_cp = skb_copy(skb, GFP_ATOMIC);
266         if (!skb_cp)
267                 return NET_RX_DROP;
268 
269         return netif_rx(skb_cp);
270 }
271 
272 static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev,
273                            struct l2cap_chan *chan)
274 {
275         const u8 *saddr, *daddr;
276         u8 iphc0, iphc1;
277         struct lowpan_dev *dev;
278         struct lowpan_peer *peer;
279 
280         dev = lowpan_dev(netdev);
281 
282         rcu_read_lock();
283         peer = __peer_lookup_chan(dev, chan);
284         rcu_read_unlock();
285         if (!peer)
286                 return -EINVAL;
287 
288         saddr = peer->eui64_addr;
289         daddr = dev->netdev->dev_addr;
290 
291         /* at least two bytes will be used for the encoding */
292         if (skb->len < 2)
293                 return -EINVAL;
294 
295         if (lowpan_fetch_skb_u8(skb, &iphc0))
296                 return -EINVAL;
297 
298         if (lowpan_fetch_skb_u8(skb, &iphc1))
299                 return -EINVAL;
300 
301         return lowpan_header_decompress(skb, netdev,
302                                         saddr, IEEE802154_ADDR_LONG,
303                                         EUI64_ADDR_LEN, daddr,
304                                         IEEE802154_ADDR_LONG, EUI64_ADDR_LEN,
305                                         iphc0, iphc1);
306 
307 }
308 
309 static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
310                     struct l2cap_chan *chan)
311 {
312         struct sk_buff *local_skb;
313         int ret;
314 
315         if (!netif_running(dev))
316                 goto drop;
317 
318         if (dev->type != ARPHRD_6LOWPAN)
319                 goto drop;
320 
321         skb = skb_share_check(skb, GFP_ATOMIC);
322         if (!skb)
323                 goto drop;
324 
325         /* check that it's our buffer */
326         if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
327                 /* Copy the packet so that the IPv6 header is
328                  * properly aligned.
329                  */
330                 local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1,
331                                             skb_tailroom(skb), GFP_ATOMIC);
332                 if (!local_skb)
333                         goto drop;
334 
335                 local_skb->protocol = htons(ETH_P_IPV6);
336                 local_skb->pkt_type = PACKET_HOST;
337 
338                 skb_reset_network_header(local_skb);
339                 skb_set_transport_header(local_skb, sizeof(struct ipv6hdr));
340 
341                 if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) {
342                         kfree_skb(local_skb);
343                         goto drop;
344                 }
345 
346                 dev->stats.rx_bytes += skb->len;
347                 dev->stats.rx_packets++;
348 
349                 consume_skb(local_skb);
350                 consume_skb(skb);
351         } else {
352                 switch (skb->data[0] & 0xe0) {
353                 case LOWPAN_DISPATCH_IPHC:      /* ipv6 datagram */
354                         local_skb = skb_clone(skb, GFP_ATOMIC);
355                         if (!local_skb)
356                                 goto drop;
357 
358                         ret = iphc_decompress(local_skb, dev, chan);
359                         if (ret < 0) {
360                                 kfree_skb(local_skb);
361                                 goto drop;
362                         }
363 
364                         local_skb->protocol = htons(ETH_P_IPV6);
365                         local_skb->pkt_type = PACKET_HOST;
366                         local_skb->dev = dev;
367 
368                         if (give_skb_to_upper(local_skb, dev)
369                                         != NET_RX_SUCCESS) {
370                                 kfree_skb(local_skb);
371                                 goto drop;
372                         }
373 
374                         dev->stats.rx_bytes += skb->len;
375                         dev->stats.rx_packets++;
376 
377                         consume_skb(local_skb);
378                         consume_skb(skb);
379                         break;
380                 default:
381                         break;
382                 }
383         }
384 
385         return NET_RX_SUCCESS;
386 
387 drop:
388         dev->stats.rx_dropped++;
389         return NET_RX_DROP;
390 }
391 
392 /* Packet from BT LE device */
393 static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
394 {
395         struct lowpan_dev *dev;
396         struct lowpan_peer *peer;
397         int err;
398 
399         peer = lookup_peer(chan->conn);
400         if (!peer)
401                 return -ENOENT;
402 
403         dev = lookup_dev(chan->conn);
404         if (!dev || !dev->netdev)
405                 return -ENOENT;
406 
407         err = recv_pkt(skb, dev->netdev, chan);
408         if (err) {
409                 BT_DBG("recv pkt %d", err);
410                 err = -EAGAIN;
411         }
412 
413         return err;
414 }
415 
416 static u8 get_addr_type_from_eui64(u8 byte)
417 {
418         /* Is universal(0) or local(1) bit */
419         return ((byte & 0x02) ? BDADDR_LE_RANDOM : BDADDR_LE_PUBLIC);
420 }
421 
422 static void copy_to_bdaddr(struct in6_addr *ip6_daddr, bdaddr_t *addr)
423 {
424         u8 *eui64 = ip6_daddr->s6_addr + 8;
425 
426         addr->b[0] = eui64[7];
427         addr->b[1] = eui64[6];
428         addr->b[2] = eui64[5];
429         addr->b[3] = eui64[2];
430         addr->b[4] = eui64[1];
431         addr->b[5] = eui64[0];
432 }
433 
434 static void convert_dest_bdaddr(struct in6_addr *ip6_daddr,
435                                 bdaddr_t *addr, u8 *addr_type)
436 {
437         copy_to_bdaddr(ip6_daddr, addr);
438 
439         /* We need to toggle the U/L bit that we got from IPv6 address
440          * so that we get the proper address and type of the BD address.
441          */
442         addr->b[5] ^= 0x02;
443 
444         *addr_type = get_addr_type_from_eui64(addr->b[5]);
445 }
446 
447 static int setup_header(struct sk_buff *skb, struct net_device *netdev,
448                         bdaddr_t *peer_addr, u8 *peer_addr_type)
449 {
450         struct in6_addr ipv6_daddr;
451         struct lowpan_dev *dev;
452         struct lowpan_peer *peer;
453         bdaddr_t addr, *any = BDADDR_ANY;
454         u8 *daddr = any->b;
455         int err, status = 0;
456 
457         dev = lowpan_dev(netdev);
458 
459         memcpy(&ipv6_daddr, &lowpan_cb(skb)->addr, sizeof(ipv6_daddr));
460 
461         if (ipv6_addr_is_multicast(&ipv6_daddr)) {
462                 lowpan_cb(skb)->chan = NULL;
463         } else {
464                 u8 addr_type;
465 
466                 /* Get destination BT device from skb.
467                  * If there is no such peer then discard the packet.
468                  */
469                 convert_dest_bdaddr(&ipv6_daddr, &addr, &addr_type);
470 
471                 BT_DBG("dest addr %pMR type %d IP %pI6c", &addr,
472                        addr_type, &ipv6_daddr);
473 
474                 peer = peer_lookup_ba(dev, &addr, addr_type);
475                 if (!peer) {
476                         /* The packet might be sent to 6lowpan interface
477                          * because of routing (either via default route
478                          * or user set route) so get peer according to
479                          * the destination address.
480                          */
481                         peer = peer_lookup_dst(dev, &ipv6_daddr, skb);
482                         if (!peer) {
483                                 BT_DBG("no such peer %pMR found", &addr);
484                                 return -ENOENT;
485                         }
486                 }
487 
488                 daddr = peer->eui64_addr;
489                 *peer_addr = addr;
490                 *peer_addr_type = addr_type;
491                 lowpan_cb(skb)->chan = peer->chan;
492 
493                 status = 1;
494         }
495 
496         lowpan_header_compress(skb, netdev, ETH_P_IPV6, daddr,
497                                dev->netdev->dev_addr, skb->len);
498 
499         err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0);
500         if (err < 0)
501                 return err;
502 
503         return status;
504 }
505 
506 static int header_create(struct sk_buff *skb, struct net_device *netdev,
507                          unsigned short type, const void *_daddr,
508                          const void *_saddr, unsigned int len)
509 {
510         struct ipv6hdr *hdr;
511 
512         if (type != ETH_P_IPV6)
513                 return -EINVAL;
514 
515         hdr = ipv6_hdr(skb);
516 
517         memcpy(&lowpan_cb(skb)->addr, &hdr->daddr, sizeof(struct in6_addr));
518 
519         return 0;
520 }
521 
522 /* Packet to BT LE device */
523 static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb,
524                     struct net_device *netdev)
525 {
526         struct msghdr msg;
527         struct kvec iv;
528         int err;
529 
530         /* Remember the skb so that we can send EAGAIN to the caller if
531          * we run out of credits.
532          */
533         chan->data = skb;
534 
535         iv.iov_base = skb->data;
536         iv.iov_len = skb->len;
537 
538         memset(&msg, 0, sizeof(msg));
539         iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, &iv, 1, skb->len);
540 
541         err = l2cap_chan_send(chan, &msg, skb->len);
542         if (err > 0) {
543                 netdev->stats.tx_bytes += err;
544                 netdev->stats.tx_packets++;
545                 return 0;
546         }
547 
548         if (!err)
549                 err = lowpan_cb(skb)->status;
550 
551         if (err < 0) {
552                 if (err == -EAGAIN)
553                         netdev->stats.tx_dropped++;
554                 else
555                         netdev->stats.tx_errors++;
556         }
557 
558         return err;
559 }
560 
561 static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev)
562 {
563         struct sk_buff *local_skb;
564         struct lowpan_dev *entry;
565         int err = 0;
566 
567         rcu_read_lock();
568 
569         list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
570                 struct lowpan_peer *pentry;
571                 struct lowpan_dev *dev;
572 
573                 if (entry->netdev != netdev)
574                         continue;
575 
576                 dev = lowpan_dev(entry->netdev);
577 
578                 list_for_each_entry_rcu(pentry, &dev->peers, list) {
579                         int ret;
580 
581                         local_skb = skb_clone(skb, GFP_ATOMIC);
582 
583                         BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
584                                netdev->name,
585                                &pentry->chan->dst, pentry->chan->dst_type,
586                                &pentry->peer_addr, pentry->chan);
587                         ret = send_pkt(pentry->chan, local_skb, netdev);
588                         if (ret < 0)
589                                 err = ret;
590 
591                         kfree_skb(local_skb);
592                 }
593         }
594 
595         rcu_read_unlock();
596 
597         return err;
598 }
599 
600 static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev)
601 {
602         int err = 0;
603         bdaddr_t addr;
604         u8 addr_type;
605 
606         /* We must take a copy of the skb before we modify/replace the ipv6
607          * header as the header could be used elsewhere
608          */
609         skb = skb_unshare(skb, GFP_ATOMIC);
610         if (!skb)
611                 return NET_XMIT_DROP;
612 
613         /* Return values from setup_header()
614          *  <0 - error, packet is dropped
615          *   0 - this is a multicast packet
616          *   1 - this is unicast packet
617          */
618         err = setup_header(skb, netdev, &addr, &addr_type);
619         if (err < 0) {
620                 kfree_skb(skb);
621                 return NET_XMIT_DROP;
622         }
623 
624         if (err) {
625                 if (lowpan_cb(skb)->chan) {
626                         BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
627                                netdev->name, &addr, addr_type,
628                                &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan);
629                         err = send_pkt(lowpan_cb(skb)->chan, skb, netdev);
630                 } else {
631                         err = -ENOENT;
632                 }
633         } else {
634                 /* We need to send the packet to every device behind this
635                  * interface.
636                  */
637                 err = send_mcast_pkt(skb, netdev);
638         }
639 
640         dev_kfree_skb(skb);
641 
642         if (err)
643                 BT_DBG("ERROR: xmit failed (%d)", err);
644 
645         return err < 0 ? NET_XMIT_DROP : err;
646 }
647 
648 static struct lock_class_key bt_tx_busylock;
649 static struct lock_class_key bt_netdev_xmit_lock_key;
650 
651 static void bt_set_lockdep_class_one(struct net_device *dev,
652                                      struct netdev_queue *txq,
653                                      void *_unused)
654 {
655         lockdep_set_class(&txq->_xmit_lock, &bt_netdev_xmit_lock_key);
656 }
657 
658 static int bt_dev_init(struct net_device *dev)
659 {
660         netdev_for_each_tx_queue(dev, bt_set_lockdep_class_one, NULL);
661         dev->qdisc_tx_busylock = &bt_tx_busylock;
662 
663         return 0;
664 }
665 
666 static const struct net_device_ops netdev_ops = {
667         .ndo_init               = bt_dev_init,
668         .ndo_start_xmit         = bt_xmit,
669 };
670 
671 static struct header_ops header_ops = {
672         .create = header_create,
673 };
674 
675 static void netdev_setup(struct net_device *dev)
676 {
677         dev->addr_len           = EUI64_ADDR_LEN;
678         dev->type               = ARPHRD_6LOWPAN;
679 
680         dev->hard_header_len    = 0;
681         dev->needed_tailroom    = 0;
682         dev->mtu                = IPV6_MIN_MTU;
683         dev->tx_queue_len       = 0;
684         dev->flags              = IFF_RUNNING | IFF_POINTOPOINT |
685                                   IFF_MULTICAST;
686         dev->watchdog_timeo     = 0;
687 
688         dev->netdev_ops         = &netdev_ops;
689         dev->header_ops         = &header_ops;
690         dev->destructor         = free_netdev;
691 }
692 
693 static struct device_type bt_type = {
694         .name   = "bluetooth",
695 };
696 
697 static void set_addr(u8 *eui, u8 *addr, u8 addr_type)
698 {
699         /* addr is the BT address in little-endian format */
700         eui[0] = addr[5];
701         eui[1] = addr[4];
702         eui[2] = addr[3];
703         eui[3] = 0xFF;
704         eui[4] = 0xFE;
705         eui[5] = addr[2];
706         eui[6] = addr[1];
707         eui[7] = addr[0];
708 
709         /* Universal/local bit set, BT 6lowpan draft ch. 3.2.1 */
710         if (addr_type == BDADDR_LE_PUBLIC)
711                 eui[0] &= ~0x02;
712         else
713                 eui[0] |= 0x02;
714 
715         BT_DBG("type %d addr %*phC", addr_type, 8, eui);
716 }
717 
718 static void set_dev_addr(struct net_device *netdev, bdaddr_t *addr,
719                          u8 addr_type)
720 {
721         netdev->addr_assign_type = NET_ADDR_PERM;
722         set_addr(netdev->dev_addr, addr->b, addr_type);
723 }
724 
725 static void ifup(struct net_device *netdev)
726 {
727         int err;
728 
729         rtnl_lock();
730         err = dev_open(netdev);
731         if (err < 0)
732                 BT_INFO("iface %s cannot be opened (%d)", netdev->name, err);
733         rtnl_unlock();
734 }
735 
736 static void ifdown(struct net_device *netdev)
737 {
738         int err;
739 
740         rtnl_lock();
741         err = dev_close(netdev);
742         if (err < 0)
743                 BT_INFO("iface %s cannot be closed (%d)", netdev->name, err);
744         rtnl_unlock();
745 }
746 
747 static void do_notify_peers(struct work_struct *work)
748 {
749         struct lowpan_dev *dev = container_of(work, struct lowpan_dev,
750                                               notify_peers.work);
751 
752         netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */
753 }
754 
755 static bool is_bt_6lowpan(struct hci_conn *hcon)
756 {
757         if (hcon->type != LE_LINK)
758                 return false;
759 
760         if (!enable_6lowpan)
761                 return false;
762 
763         return true;
764 }
765 
766 static struct l2cap_chan *chan_create(void)
767 {
768         struct l2cap_chan *chan;
769 
770         chan = l2cap_chan_create();
771         if (!chan)
772                 return NULL;
773 
774         l2cap_chan_set_defaults(chan);
775 
776         chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
777         chan->mode = L2CAP_MODE_LE_FLOWCTL;
778         chan->omtu = 65535;
779         chan->imtu = chan->omtu;
780 
781         return chan;
782 }
783 
784 static struct l2cap_chan *chan_open(struct l2cap_chan *pchan)
785 {
786         struct l2cap_chan *chan;
787 
788         chan = chan_create();
789         if (!chan)
790                 return NULL;
791 
792         chan->remote_mps = chan->omtu;
793         chan->mps = chan->omtu;
794 
795         chan->state = BT_CONNECTED;
796 
797         return chan;
798 }
799 
800 static void set_ip_addr_bits(u8 addr_type, u8 *addr)
801 {
802         if (addr_type == BDADDR_LE_PUBLIC)
803                 *addr |= 0x02;
804         else
805                 *addr &= ~0x02;
806 }
807 
808 static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan,
809                                         struct lowpan_dev *dev)
810 {
811         struct lowpan_peer *peer;
812 
813         peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
814         if (!peer)
815                 return NULL;
816 
817         peer->chan = chan;
818         memset(&peer->peer_addr, 0, sizeof(struct in6_addr));
819 
820         /* RFC 2464 ch. 5 */
821         peer->peer_addr.s6_addr[0] = 0xFE;
822         peer->peer_addr.s6_addr[1] = 0x80;
823         set_addr((u8 *)&peer->peer_addr.s6_addr + 8, chan->dst.b,
824                  chan->dst_type);
825 
826         memcpy(&peer->eui64_addr, (u8 *)&peer->peer_addr.s6_addr + 8,
827                EUI64_ADDR_LEN);
828 
829         /* IPv6 address needs to have the U/L bit set properly so toggle
830          * it back here.
831          */
832         set_ip_addr_bits(chan->dst_type, (u8 *)&peer->peer_addr.s6_addr + 8);
833 
834         spin_lock(&devices_lock);
835         INIT_LIST_HEAD(&peer->list);
836         peer_add(dev, peer);
837         spin_unlock(&devices_lock);
838 
839         /* Notifying peers about us needs to be done without locks held */
840         INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers);
841         schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100));
842 
843         return peer->chan;
844 }
845 
846 static int setup_netdev(struct l2cap_chan *chan, struct lowpan_dev **dev)
847 {
848         struct net_device *netdev;
849         int err = 0;
850 
851         netdev = alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_dev)),
852                               IFACE_NAME_TEMPLATE, NET_NAME_UNKNOWN,
853                               netdev_setup);
854         if (!netdev)
855                 return -ENOMEM;
856 
857         set_dev_addr(netdev, &chan->src, chan->src_type);
858 
859         netdev->netdev_ops = &netdev_ops;
860         SET_NETDEV_DEV(netdev, &chan->conn->hcon->hdev->dev);
861         SET_NETDEV_DEVTYPE(netdev, &bt_type);
862 
863         *dev = lowpan_dev(netdev);
864         (*dev)->netdev = netdev;
865         (*dev)->hdev = chan->conn->hcon->hdev;
866         INIT_LIST_HEAD(&(*dev)->peers);
867 
868         spin_lock(&devices_lock);
869         INIT_LIST_HEAD(&(*dev)->list);
870         list_add_rcu(&(*dev)->list, &bt_6lowpan_devices);
871         spin_unlock(&devices_lock);
872 
873         lowpan_netdev_setup(netdev, LOWPAN_LLTYPE_BTLE);
874 
875         err = register_netdev(netdev);
876         if (err < 0) {
877                 BT_INFO("register_netdev failed %d", err);
878                 spin_lock(&devices_lock);
879                 list_del_rcu(&(*dev)->list);
880                 spin_unlock(&devices_lock);
881                 free_netdev(netdev);
882                 goto out;
883         }
884 
885         BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d",
886                netdev->ifindex, &chan->dst, chan->dst_type,
887                &chan->src, chan->src_type);
888         set_bit(__LINK_STATE_PRESENT, &netdev->state);
889 
890         return 0;
891 
892 out:
893         return err;
894 }
895 
896 static inline void chan_ready_cb(struct l2cap_chan *chan)
897 {
898         struct lowpan_dev *dev;
899 
900         dev = lookup_dev(chan->conn);
901 
902         BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev);
903 
904         if (!dev) {
905                 if (setup_netdev(chan, &dev) < 0) {
906                         l2cap_chan_del(chan, -ENOENT);
907                         return;
908                 }
909         }
910 
911         if (!try_module_get(THIS_MODULE))
912                 return;
913 
914         add_peer_chan(chan, dev);
915         ifup(dev->netdev);
916 }
917 
918 static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan)
919 {
920         struct l2cap_chan *chan;
921 
922         chan = chan_open(pchan);
923         chan->ops = pchan->ops;
924 
925         BT_DBG("chan %p pchan %p", chan, pchan);
926 
927         return chan;
928 }
929 
930 static void delete_netdev(struct work_struct *work)
931 {
932         struct lowpan_dev *entry = container_of(work, struct lowpan_dev,
933                                                 delete_netdev);
934 
935         unregister_netdev(entry->netdev);
936 
937         /* The entry pointer is deleted by the netdev destructor. */
938 }
939 
940 static void chan_close_cb(struct l2cap_chan *chan)
941 {
942         struct lowpan_dev *entry;
943         struct lowpan_dev *dev = NULL;
944         struct lowpan_peer *peer;
945         int err = -ENOENT;
946         bool last = false, remove = true;
947 
948         BT_DBG("chan %p conn %p", chan, chan->conn);
949 
950         if (chan->conn && chan->conn->hcon) {
951                 if (!is_bt_6lowpan(chan->conn->hcon))
952                         return;
953 
954                 /* If conn is set, then the netdev is also there and we should
955                  * not remove it.
956                  */
957                 remove = false;
958         }
959 
960         spin_lock(&devices_lock);
961 
962         list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
963                 dev = lowpan_dev(entry->netdev);
964                 peer = __peer_lookup_chan(dev, chan);
965                 if (peer) {
966                         last = peer_del(dev, peer);
967                         err = 0;
968 
969                         BT_DBG("dev %p removing %speer %p", dev,
970                                last ? "last " : "1 ", peer);
971                         BT_DBG("chan %p orig refcnt %d", chan,
972                                atomic_read(&chan->kref.refcount));
973 
974                         l2cap_chan_put(chan);
975                         break;
976                 }
977         }
978 
979         if (!err && last && dev && !atomic_read(&dev->peer_count)) {
980                 spin_unlock(&devices_lock);
981 
982                 cancel_delayed_work_sync(&dev->notify_peers);
983 
984                 ifdown(dev->netdev);
985 
986                 if (remove) {
987                         INIT_WORK(&entry->delete_netdev, delete_netdev);
988                         schedule_work(&entry->delete_netdev);
989                 }
990         } else {
991                 spin_unlock(&devices_lock);
992         }
993 
994         return;
995 }
996 
997 static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err)
998 {
999         BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn,
1000                state_to_string(state), err);
1001 }
1002 
1003 static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan,
1004                                          unsigned long hdr_len,
1005                                          unsigned long len, int nb)
1006 {
1007         /* Note that we must allocate using GFP_ATOMIC here as
1008          * this function is called originally from netdev hard xmit
1009          * function in atomic context.
1010          */
1011         return bt_skb_alloc(hdr_len + len, GFP_ATOMIC);
1012 }
1013 
1014 static void chan_suspend_cb(struct l2cap_chan *chan)
1015 {
1016         struct sk_buff *skb = chan->data;
1017 
1018         BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb);
1019 
1020         if (!skb)
1021                 return;
1022 
1023         lowpan_cb(skb)->status = -EAGAIN;
1024 }
1025 
1026 static void chan_resume_cb(struct l2cap_chan *chan)
1027 {
1028         struct sk_buff *skb = chan->data;
1029 
1030         BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb);
1031 
1032         if (!skb)
1033                 return;
1034 
1035         lowpan_cb(skb)->status = 0;
1036 }
1037 
1038 static long chan_get_sndtimeo_cb(struct l2cap_chan *chan)
1039 {
1040         return L2CAP_CONN_TIMEOUT;
1041 }
1042 
1043 static const struct l2cap_ops bt_6lowpan_chan_ops = {
1044         .name                   = "L2CAP 6LoWPAN channel",
1045         .new_connection         = chan_new_conn_cb,
1046         .recv                   = chan_recv_cb,
1047         .close                  = chan_close_cb,
1048         .state_change           = chan_state_change_cb,
1049         .ready                  = chan_ready_cb,
1050         .resume                 = chan_resume_cb,
1051         .suspend                = chan_suspend_cb,
1052         .get_sndtimeo           = chan_get_sndtimeo_cb,
1053         .alloc_skb              = chan_alloc_skb_cb,
1054 
1055         .teardown               = l2cap_chan_no_teardown,
1056         .defer                  = l2cap_chan_no_defer,
1057         .set_shutdown           = l2cap_chan_no_set_shutdown,
1058 };
1059 
1060 static inline __u8 bdaddr_type(__u8 type)
1061 {
1062         if (type == ADDR_LE_DEV_PUBLIC)
1063                 return BDADDR_LE_PUBLIC;
1064         else
1065                 return BDADDR_LE_RANDOM;
1066 }
1067 
1068 static struct l2cap_chan *chan_get(void)
1069 {
1070         struct l2cap_chan *pchan;
1071 
1072         pchan = chan_create();
1073         if (!pchan)
1074                 return NULL;
1075 
1076         pchan->ops = &bt_6lowpan_chan_ops;
1077 
1078         return pchan;
1079 }
1080 
1081 static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type)
1082 {
1083         struct l2cap_chan *pchan;
1084         int err;
1085 
1086         pchan = chan_get();
1087         if (!pchan)
1088                 return -EINVAL;
1089 
1090         err = l2cap_chan_connect(pchan, cpu_to_le16(L2CAP_PSM_IPSP), 0,
1091                                  addr, dst_type);
1092 
1093         BT_DBG("chan %p err %d", pchan, err);
1094         if (err < 0)
1095                 l2cap_chan_put(pchan);
1096 
1097         return err;
1098 }
1099 
1100 static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type)
1101 {
1102         struct lowpan_peer *peer;
1103 
1104         BT_DBG("conn %p dst type %d", conn, dst_type);
1105 
1106         peer = lookup_peer(conn);
1107         if (!peer)
1108                 return -ENOENT;
1109 
1110         BT_DBG("peer %p chan %p", peer, peer->chan);
1111 
1112         l2cap_chan_close(peer->chan, ENOENT);
1113 
1114         return 0;
1115 }
1116 
1117 static struct l2cap_chan *bt_6lowpan_listen(void)
1118 {
1119         bdaddr_t *addr = BDADDR_ANY;
1120         struct l2cap_chan *pchan;
1121         int err;
1122 
1123         if (!enable_6lowpan)
1124                 return NULL;
1125 
1126         pchan = chan_get();
1127         if (!pchan)
1128                 return NULL;
1129 
1130         pchan->state = BT_LISTEN;
1131         pchan->src_type = BDADDR_LE_PUBLIC;
1132 
1133         atomic_set(&pchan->nesting, L2CAP_NESTING_PARENT);
1134 
1135         BT_DBG("chan %p src type %d", pchan, pchan->src_type);
1136 
1137         err = l2cap_add_psm(pchan, addr, cpu_to_le16(L2CAP_PSM_IPSP));
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         spin_unlock(&devices_lock);
1219 }
1220 
1221 struct set_enable {
1222         struct work_struct work;
1223         bool flag;
1224 };
1225 
1226 static void do_enable_set(struct work_struct *work)
1227 {
1228         struct set_enable *set_enable = container_of(work,
1229                                                      struct set_enable, work);
1230 
1231         if (!set_enable->flag || enable_6lowpan != set_enable->flag)
1232                 /* Disconnect existing connections if 6lowpan is
1233                  * disabled
1234                  */
1235                 disconnect_all_peers();
1236 
1237         enable_6lowpan = set_enable->flag;
1238 
1239         if (listen_chan) {
1240                 l2cap_chan_close(listen_chan, 0);
1241                 l2cap_chan_put(listen_chan);
1242         }
1243 
1244         listen_chan = bt_6lowpan_listen();
1245 
1246         kfree(set_enable);
1247 }
1248 
1249 static int lowpan_enable_set(void *data, u64 val)
1250 {
1251         struct set_enable *set_enable;
1252 
1253         set_enable = kzalloc(sizeof(*set_enable), GFP_KERNEL);
1254         if (!set_enable)
1255                 return -ENOMEM;
1256 
1257         set_enable->flag = !!val;
1258         INIT_WORK(&set_enable->work, do_enable_set);
1259 
1260         schedule_work(&set_enable->work);
1261 
1262         return 0;
1263 }
1264 
1265 static int lowpan_enable_get(void *data, u64 *val)
1266 {
1267         *val = enable_6lowpan;
1268         return 0;
1269 }
1270 
1271 DEFINE_SIMPLE_ATTRIBUTE(lowpan_enable_fops, lowpan_enable_get,
1272                         lowpan_enable_set, "%llu\n");
1273 
1274 static ssize_t lowpan_control_write(struct file *fp,
1275                                     const char __user *user_buffer,
1276                                     size_t count,
1277                                     loff_t *position)
1278 {
1279         char buf[32];
1280         size_t buf_size = min(count, sizeof(buf) - 1);
1281         int ret;
1282         bdaddr_t addr;
1283         u8 addr_type;
1284         struct l2cap_conn *conn = NULL;
1285 
1286         if (copy_from_user(buf, user_buffer, buf_size))
1287                 return -EFAULT;
1288 
1289         buf[buf_size] = '\0';
1290 
1291         if (memcmp(buf, "connect ", 8) == 0) {
1292                 ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn);
1293                 if (ret == -EINVAL)
1294                         return ret;
1295 
1296                 if (listen_chan) {
1297                         l2cap_chan_close(listen_chan, 0);
1298                         l2cap_chan_put(listen_chan);
1299                         listen_chan = NULL;
1300                 }
1301 
1302                 if (conn) {
1303                         struct lowpan_peer *peer;
1304 
1305                         if (!is_bt_6lowpan(conn->hcon))
1306                                 return -EINVAL;
1307 
1308                         peer = lookup_peer(conn);
1309                         if (peer) {
1310                                 BT_DBG("6LoWPAN connection already exists");
1311                                 return -EALREADY;
1312                         }
1313 
1314                         BT_DBG("conn %p dst %pMR type %d user %d", conn,
1315                                &conn->hcon->dst, conn->hcon->dst_type,
1316                                addr_type);
1317                 }
1318 
1319                 ret = bt_6lowpan_connect(&addr, addr_type);
1320                 if (ret < 0)
1321                         return ret;
1322 
1323                 return count;
1324         }
1325 
1326         if (memcmp(buf, "disconnect ", 11) == 0) {
1327                 ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn);
1328                 if (ret < 0)
1329                         return ret;
1330 
1331                 ret = bt_6lowpan_disconnect(conn, addr_type);
1332                 if (ret < 0)
1333                         return ret;
1334 
1335                 return count;
1336         }
1337 
1338         return count;
1339 }
1340 
1341 static int lowpan_control_show(struct seq_file *f, void *ptr)
1342 {
1343         struct lowpan_dev *entry;
1344         struct lowpan_peer *peer;
1345 
1346         spin_lock(&devices_lock);
1347 
1348         list_for_each_entry(entry, &bt_6lowpan_devices, list) {
1349                 list_for_each_entry(peer, &entry->peers, list)
1350                         seq_printf(f, "%pMR (type %u)\n",
1351                                    &peer->chan->dst, peer->chan->dst_type);
1352         }
1353 
1354         spin_unlock(&devices_lock);
1355 
1356         return 0;
1357 }
1358 
1359 static int lowpan_control_open(struct inode *inode, struct file *file)
1360 {
1361         return single_open(file, lowpan_control_show, inode->i_private);
1362 }
1363 
1364 static const struct file_operations lowpan_control_fops = {
1365         .open           = lowpan_control_open,
1366         .read           = seq_read,
1367         .write          = lowpan_control_write,
1368         .llseek         = seq_lseek,
1369         .release        = single_release,
1370 };
1371 
1372 static void disconnect_devices(void)
1373 {
1374         struct lowpan_dev *entry, *tmp, *new_dev;
1375         struct list_head devices;
1376 
1377         INIT_LIST_HEAD(&devices);
1378 
1379         /* We make a separate list of devices because the unregister_netdev()
1380          * will call device_event() which will also want to modify the same
1381          * devices list.
1382          */
1383 
1384         rcu_read_lock();
1385 
1386         list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
1387                 new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC);
1388                 if (!new_dev)
1389                         break;
1390 
1391                 new_dev->netdev = entry->netdev;
1392                 INIT_LIST_HEAD(&new_dev->list);
1393 
1394                 list_add_rcu(&new_dev->list, &devices);
1395         }
1396 
1397         rcu_read_unlock();
1398 
1399         list_for_each_entry_safe(entry, tmp, &devices, list) {
1400                 ifdown(entry->netdev);
1401                 BT_DBG("Unregistering netdev %s %p",
1402                        entry->netdev->name, entry->netdev);
1403                 unregister_netdev(entry->netdev);
1404                 kfree(entry);
1405         }
1406 }
1407 
1408 static int device_event(struct notifier_block *unused,
1409                         unsigned long event, void *ptr)
1410 {
1411         struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
1412         struct lowpan_dev *entry;
1413 
1414         if (netdev->type != ARPHRD_6LOWPAN)
1415                 return NOTIFY_DONE;
1416 
1417         switch (event) {
1418         case NETDEV_UNREGISTER:
1419                 spin_lock(&devices_lock);
1420                 list_for_each_entry(entry, &bt_6lowpan_devices, list) {
1421                         if (entry->netdev == netdev) {
1422                                 BT_DBG("Unregistered netdev %s %p",
1423                                        netdev->name, netdev);
1424                                 list_del(&entry->list);
1425                                 break;
1426                         }
1427                 }
1428                 spin_unlock(&devices_lock);
1429                 break;
1430         }
1431 
1432         return NOTIFY_DONE;
1433 }
1434 
1435 static struct notifier_block bt_6lowpan_dev_notifier = {
1436         .notifier_call = device_event,
1437 };
1438 
1439 static int __init bt_6lowpan_init(void)
1440 {
1441         lowpan_enable_debugfs = debugfs_create_file("6lowpan_enable", 0644,
1442                                                     bt_debugfs, NULL,
1443                                                     &lowpan_enable_fops);
1444         lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644,
1445                                                      bt_debugfs, NULL,
1446                                                      &lowpan_control_fops);
1447 
1448         return register_netdevice_notifier(&bt_6lowpan_dev_notifier);
1449 }
1450 
1451 static void __exit bt_6lowpan_exit(void)
1452 {
1453         debugfs_remove(lowpan_enable_debugfs);
1454         debugfs_remove(lowpan_control_debugfs);
1455 
1456         if (listen_chan) {
1457                 l2cap_chan_close(listen_chan, 0);
1458                 l2cap_chan_put(listen_chan);
1459         }
1460 
1461         disconnect_devices();
1462 
1463         unregister_netdevice_notifier(&bt_6lowpan_dev_notifier);
1464 }
1465 
1466 module_init(bt_6lowpan_init);
1467 module_exit(bt_6lowpan_exit);
1468 
1469 MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>");
1470 MODULE_DESCRIPTION("Bluetooth 6LoWPAN");
1471 MODULE_VERSION(VERSION);
1472 MODULE_LICENSE("GPL");
1473 

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