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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 | #include <net/pkt_sched.h> | |
24 | ||
25 | #include <net/bluetooth/bluetooth.h> | |
26 | #include <net/bluetooth/hci_core.h> | |
27 | #include <net/bluetooth/l2cap.h> | |
28 | ||
29 | #include <net/6lowpan.h> /* for the compression support */ | |
30 | ||
31 | #define VERSION "0.1" | |
32 | ||
33 | static struct dentry *lowpan_enable_debugfs; | |
34 | static struct dentry *lowpan_control_debugfs; | |
35 | ||
36 | #define IFACE_NAME_TEMPLATE "bt%d" | |
37 | ||
38 | struct skb_cb { | |
39 | struct in6_addr addr; | |
40 | struct in6_addr gw; | |
41 | struct l2cap_chan *chan; | |
42 | }; | |
43 | #define lowpan_cb(skb) ((struct skb_cb *)((skb)->cb)) | |
44 | ||
45 | /* The devices list contains those devices that we are acting | |
46 | * as a proxy. The BT 6LoWPAN device is a virtual device that | |
47 | * connects to the Bluetooth LE device. The real connection to | |
48 | * BT device is done via l2cap layer. There exists one | |
49 | * virtual device / one BT 6LoWPAN network (=hciX device). | |
50 | * The list contains struct lowpan_dev elements. | |
51 | */ | |
52 | static LIST_HEAD(bt_6lowpan_devices); | |
53 | static DEFINE_SPINLOCK(devices_lock); | |
54 | ||
55 | static bool enable_6lowpan; | |
56 | ||
57 | /* We are listening incoming connections via this channel | |
58 | */ | |
59 | static struct l2cap_chan *listen_chan; | |
60 | ||
61 | struct lowpan_peer { | |
62 | struct list_head list; | |
63 | struct rcu_head rcu; | |
64 | struct l2cap_chan *chan; | |
65 | ||
66 | /* peer addresses in various formats */ | |
67 | unsigned char lladdr[ETH_ALEN]; | |
68 | struct in6_addr peer_addr; | |
69 | }; | |
70 | ||
71 | struct lowpan_btle_dev { | |
72 | struct list_head list; | |
73 | ||
74 | struct hci_dev *hdev; | |
75 | struct net_device *netdev; | |
76 | struct list_head peers; | |
77 | atomic_t peer_count; /* number of items in peers list */ | |
78 | ||
79 | struct work_struct delete_netdev; | |
80 | struct delayed_work notify_peers; | |
81 | }; | |
82 | ||
83 | static inline struct lowpan_btle_dev * | |
84 | lowpan_btle_dev(const struct net_device *netdev) | |
85 | { | |
86 | return (struct lowpan_btle_dev *)lowpan_dev(netdev)->priv; | |
87 | } | |
88 | ||
89 | static inline void peer_add(struct lowpan_btle_dev *dev, | |
90 | struct lowpan_peer *peer) | |
91 | { | |
92 | list_add_rcu(&peer->list, &dev->peers); | |
93 | atomic_inc(&dev->peer_count); | |
94 | } | |
95 | ||
96 | static inline bool peer_del(struct lowpan_btle_dev *dev, | |
97 | 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_btle_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 * | |
141 | __peer_lookup_chan(struct lowpan_btle_dev *dev, 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 * | |
154 | __peer_lookup_conn(struct lowpan_btle_dev *dev, 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_btle_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_btle_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_btle_dev *lookup_dev(struct l2cap_conn *conn) | |
243 | { | |
244 | struct lowpan_btle_dev *entry; | |
245 | struct lowpan_btle_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_ni(skb_cp); | |
270 | } | |
271 | ||
272 | static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev, | |
273 | struct lowpan_peer *peer) | |
274 | { | |
275 | const u8 *saddr; | |
276 | struct lowpan_btle_dev *dev; | |
277 | ||
278 | dev = lowpan_btle_dev(netdev); | |
279 | ||
280 | saddr = peer->lladdr; | |
281 | ||
282 | return lowpan_header_decompress(skb, netdev, netdev->dev_addr, saddr); | |
283 | } | |
284 | ||
285 | static int recv_pkt(struct sk_buff *skb, struct net_device *dev, | |
286 | struct lowpan_peer *peer) | |
287 | { | |
288 | struct sk_buff *local_skb; | |
289 | int ret; | |
290 | ||
291 | if (!netif_running(dev)) | |
292 | goto drop; | |
293 | ||
294 | if (dev->type != ARPHRD_6LOWPAN || !skb->len) | |
295 | goto drop; | |
296 | ||
297 | skb_reset_network_header(skb); | |
298 | ||
299 | skb = skb_share_check(skb, GFP_ATOMIC); | |
300 | if (!skb) | |
301 | goto drop; | |
302 | ||
303 | /* check that it's our buffer */ | |
304 | if (lowpan_is_ipv6(*skb_network_header(skb))) { | |
305 | /* Pull off the 1-byte of 6lowpan header. */ | |
306 | skb_pull(skb, 1); | |
307 | ||
308 | /* Copy the packet so that the IPv6 header is | |
309 | * properly aligned. | |
310 | */ | |
311 | local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1, | |
312 | skb_tailroom(skb), GFP_ATOMIC); | |
313 | if (!local_skb) | |
314 | goto drop; | |
315 | ||
316 | local_skb->protocol = htons(ETH_P_IPV6); | |
317 | local_skb->pkt_type = PACKET_HOST; | |
318 | local_skb->dev = dev; | |
319 | ||
320 | skb_set_transport_header(local_skb, sizeof(struct ipv6hdr)); | |
321 | ||
322 | if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) { | |
323 | kfree_skb(local_skb); | |
324 | goto drop; | |
325 | } | |
326 | ||
327 | dev->stats.rx_bytes += skb->len; | |
328 | dev->stats.rx_packets++; | |
329 | ||
330 | consume_skb(local_skb); | |
331 | consume_skb(skb); | |
332 | } else if (lowpan_is_iphc(*skb_network_header(skb))) { | |
333 | local_skb = skb_clone(skb, GFP_ATOMIC); | |
334 | if (!local_skb) | |
335 | goto drop; | |
336 | ||
337 | local_skb->dev = dev; | |
338 | ||
339 | ret = iphc_decompress(local_skb, dev, peer); | |
340 | if (ret < 0) { | |
341 | BT_DBG("iphc_decompress failed: %d", ret); | |
342 | kfree_skb(local_skb); | |
343 | goto drop; | |
344 | } | |
345 | ||
346 | local_skb->protocol = htons(ETH_P_IPV6); | |
347 | local_skb->pkt_type = PACKET_HOST; | |
348 | ||
349 | if (give_skb_to_upper(local_skb, dev) | |
350 | != NET_RX_SUCCESS) { | |
351 | kfree_skb(local_skb); | |
352 | goto drop; | |
353 | } | |
354 | ||
355 | dev->stats.rx_bytes += skb->len; | |
356 | dev->stats.rx_packets++; | |
357 | ||
358 | consume_skb(local_skb); | |
359 | consume_skb(skb); | |
360 | } else { | |
361 | BT_DBG("unknown packet type"); | |
362 | goto drop; | |
363 | } | |
364 | ||
365 | return NET_RX_SUCCESS; | |
366 | ||
367 | drop: | |
368 | dev->stats.rx_dropped++; | |
369 | return NET_RX_DROP; | |
370 | } | |
371 | ||
372 | /* Packet from BT LE device */ | |
373 | static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) | |
374 | { | |
375 | struct lowpan_btle_dev *dev; | |
376 | struct lowpan_peer *peer; | |
377 | int err; | |
378 | ||
379 | peer = lookup_peer(chan->conn); | |
380 | if (!peer) | |
381 | return -ENOENT; | |
382 | ||
383 | dev = lookup_dev(chan->conn); | |
384 | if (!dev || !dev->netdev) | |
385 | return -ENOENT; | |
386 | ||
387 | err = recv_pkt(skb, dev->netdev, peer); | |
388 | if (err) { | |
389 | BT_DBG("recv pkt %d", err); | |
390 | err = -EAGAIN; | |
391 | } | |
392 | ||
393 | return err; | |
394 | } | |
395 | ||
396 | static int setup_header(struct sk_buff *skb, struct net_device *netdev, | |
397 | bdaddr_t *peer_addr, u8 *peer_addr_type) | |
398 | { | |
399 | struct in6_addr ipv6_daddr; | |
400 | struct ipv6hdr *hdr; | |
401 | struct lowpan_btle_dev *dev; | |
402 | struct lowpan_peer *peer; | |
403 | u8 *daddr; | |
404 | int err, status = 0; | |
405 | ||
406 | hdr = ipv6_hdr(skb); | |
407 | ||
408 | dev = lowpan_btle_dev(netdev); | |
409 | ||
410 | memcpy(&ipv6_daddr, &hdr->daddr, sizeof(ipv6_daddr)); | |
411 | ||
412 | if (ipv6_addr_is_multicast(&ipv6_daddr)) { | |
413 | lowpan_cb(skb)->chan = NULL; | |
414 | daddr = NULL; | |
415 | } else { | |
416 | BT_DBG("dest IP %pI6c", &ipv6_daddr); | |
417 | ||
418 | /* The packet might be sent to 6lowpan interface | |
419 | * because of routing (either via default route | |
420 | * or user set route) so get peer according to | |
421 | * the destination address. | |
422 | */ | |
423 | peer = peer_lookup_dst(dev, &ipv6_daddr, skb); | |
424 | if (!peer) { | |
425 | BT_DBG("no such peer"); | |
426 | return -ENOENT; | |
427 | } | |
428 | ||
429 | daddr = peer->lladdr; | |
430 | *peer_addr = peer->chan->dst; | |
431 | *peer_addr_type = peer->chan->dst_type; | |
432 | lowpan_cb(skb)->chan = peer->chan; | |
433 | ||
434 | status = 1; | |
435 | } | |
436 | ||
437 | lowpan_header_compress(skb, netdev, daddr, dev->netdev->dev_addr); | |
438 | ||
439 | err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0); | |
440 | if (err < 0) | |
441 | return err; | |
442 | ||
443 | return status; | |
444 | } | |
445 | ||
446 | static int header_create(struct sk_buff *skb, struct net_device *netdev, | |
447 | unsigned short type, const void *_daddr, | |
448 | const void *_saddr, unsigned int len) | |
449 | { | |
450 | if (type != ETH_P_IPV6) | |
451 | return -EINVAL; | |
452 | ||
453 | return 0; | |
454 | } | |
455 | ||
456 | /* Packet to BT LE device */ | |
457 | static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb, | |
458 | struct net_device *netdev) | |
459 | { | |
460 | struct msghdr msg; | |
461 | struct kvec iv; | |
462 | int err; | |
463 | ||
464 | /* Remember the skb so that we can send EAGAIN to the caller if | |
465 | * we run out of credits. | |
466 | */ | |
467 | chan->data = skb; | |
468 | ||
469 | iv.iov_base = skb->data; | |
470 | iv.iov_len = skb->len; | |
471 | ||
472 | memset(&msg, 0, sizeof(msg)); | |
473 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, &iv, 1, skb->len); | |
474 | ||
475 | err = l2cap_chan_send(chan, &msg, skb->len); | |
476 | if (err > 0) { | |
477 | netdev->stats.tx_bytes += err; | |
478 | netdev->stats.tx_packets++; | |
479 | return 0; | |
480 | } | |
481 | ||
482 | if (err < 0) | |
483 | netdev->stats.tx_errors++; | |
484 | ||
485 | return err; | |
486 | } | |
487 | ||
488 | static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev) | |
489 | { | |
490 | struct sk_buff *local_skb; | |
491 | struct lowpan_btle_dev *entry; | |
492 | int err = 0; | |
493 | ||
494 | rcu_read_lock(); | |
495 | ||
496 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { | |
497 | struct lowpan_peer *pentry; | |
498 | struct lowpan_btle_dev *dev; | |
499 | ||
500 | if (entry->netdev != netdev) | |
501 | continue; | |
502 | ||
503 | dev = lowpan_btle_dev(entry->netdev); | |
504 | ||
505 | list_for_each_entry_rcu(pentry, &dev->peers, list) { | |
506 | int ret; | |
507 | ||
508 | local_skb = skb_clone(skb, GFP_ATOMIC); | |
509 | ||
510 | BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p", | |
511 | netdev->name, | |
512 | &pentry->chan->dst, pentry->chan->dst_type, | |
513 | &pentry->peer_addr, pentry->chan); | |
514 | ret = send_pkt(pentry->chan, local_skb, netdev); | |
515 | if (ret < 0) | |
516 | err = ret; | |
517 | ||
518 | kfree_skb(local_skb); | |
519 | } | |
520 | } | |
521 | ||
522 | rcu_read_unlock(); | |
523 | ||
524 | return err; | |
525 | } | |
526 | ||
527 | static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev) | |
528 | { | |
529 | int err = 0; | |
530 | bdaddr_t addr; | |
531 | u8 addr_type; | |
532 | ||
533 | /* We must take a copy of the skb before we modify/replace the ipv6 | |
534 | * header as the header could be used elsewhere | |
535 | */ | |
536 | skb = skb_unshare(skb, GFP_ATOMIC); | |
537 | if (!skb) | |
538 | return NET_XMIT_DROP; | |
539 | ||
540 | /* Return values from setup_header() | |
541 | * <0 - error, packet is dropped | |
542 | * 0 - this is a multicast packet | |
543 | * 1 - this is unicast packet | |
544 | */ | |
545 | err = setup_header(skb, netdev, &addr, &addr_type); | |
546 | if (err < 0) { | |
547 | kfree_skb(skb); | |
548 | return NET_XMIT_DROP; | |
549 | } | |
550 | ||
551 | if (err) { | |
552 | if (lowpan_cb(skb)->chan) { | |
553 | BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p", | |
554 | netdev->name, &addr, addr_type, | |
555 | &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan); | |
556 | err = send_pkt(lowpan_cb(skb)->chan, skb, netdev); | |
557 | } else { | |
558 | err = -ENOENT; | |
559 | } | |
560 | } else { | |
561 | /* We need to send the packet to every device behind this | |
562 | * interface. | |
563 | */ | |
564 | err = send_mcast_pkt(skb, netdev); | |
565 | } | |
566 | ||
567 | dev_kfree_skb(skb); | |
568 | ||
569 | if (err) | |
570 | BT_DBG("ERROR: xmit failed (%d)", err); | |
571 | ||
572 | return err < 0 ? NET_XMIT_DROP : err; | |
573 | } | |
574 | ||
575 | static int bt_dev_init(struct net_device *dev) | |
576 | { | |
577 | netdev_lockdep_set_classes(dev); | |
578 | ||
579 | return 0; | |
580 | } | |
581 | ||
582 | static const struct net_device_ops netdev_ops = { | |
583 | .ndo_init = bt_dev_init, | |
584 | .ndo_start_xmit = bt_xmit, | |
585 | }; | |
586 | ||
587 | static struct header_ops header_ops = { | |
588 | .create = header_create, | |
589 | }; | |
590 | ||
591 | static void netdev_setup(struct net_device *dev) | |
592 | { | |
593 | dev->hard_header_len = 0; | |
594 | dev->needed_tailroom = 0; | |
595 | dev->flags = IFF_RUNNING | IFF_MULTICAST; | |
596 | dev->watchdog_timeo = 0; | |
597 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; | |
598 | ||
599 | dev->netdev_ops = &netdev_ops; | |
600 | dev->header_ops = &header_ops; | |
601 | dev->needs_free_netdev = true; | |
602 | } | |
603 | ||
604 | static struct device_type bt_type = { | |
605 | .name = "bluetooth", | |
606 | }; | |
607 | ||
608 | static void ifup(struct net_device *netdev) | |
609 | { | |
610 | int err; | |
611 | ||
612 | rtnl_lock(); | |
613 | err = dev_open(netdev); | |
614 | if (err < 0) | |
615 | BT_INFO("iface %s cannot be opened (%d)", netdev->name, err); | |
616 | rtnl_unlock(); | |
617 | } | |
618 | ||
619 | static void ifdown(struct net_device *netdev) | |
620 | { | |
621 | int err; | |
622 | ||
623 | rtnl_lock(); | |
624 | err = dev_close(netdev); | |
625 | if (err < 0) | |
626 | BT_INFO("iface %s cannot be closed (%d)", netdev->name, err); | |
627 | rtnl_unlock(); | |
628 | } | |
629 | ||
630 | static void do_notify_peers(struct work_struct *work) | |
631 | { | |
632 | struct lowpan_btle_dev *dev = container_of(work, struct lowpan_btle_dev, | |
633 | notify_peers.work); | |
634 | ||
635 | netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */ | |
636 | } | |
637 | ||
638 | static bool is_bt_6lowpan(struct hci_conn *hcon) | |
639 | { | |
640 | if (hcon->type != LE_LINK) | |
641 | return false; | |
642 | ||
643 | if (!enable_6lowpan) | |
644 | return false; | |
645 | ||
646 | return true; | |
647 | } | |
648 | ||
649 | static struct l2cap_chan *chan_create(void) | |
650 | { | |
651 | struct l2cap_chan *chan; | |
652 | ||
653 | chan = l2cap_chan_create(); | |
654 | if (!chan) | |
655 | return NULL; | |
656 | ||
657 | l2cap_chan_set_defaults(chan); | |
658 | ||
659 | chan->chan_type = L2CAP_CHAN_CONN_ORIENTED; | |
660 | chan->mode = L2CAP_MODE_LE_FLOWCTL; | |
661 | chan->imtu = 1280; | |
662 | ||
663 | return chan; | |
664 | } | |
665 | ||
666 | static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan, | |
667 | struct lowpan_btle_dev *dev, | |
668 | bool new_netdev) | |
669 | { | |
670 | struct lowpan_peer *peer; | |
671 | ||
672 | peer = kzalloc(sizeof(*peer), GFP_ATOMIC); | |
673 | if (!peer) | |
674 | return NULL; | |
675 | ||
676 | peer->chan = chan; | |
677 | memset(&peer->peer_addr, 0, sizeof(struct in6_addr)); | |
678 | ||
679 | baswap((void *)peer->lladdr, &chan->dst); | |
680 | ||
681 | lowpan_iphc_uncompress_eui48_lladdr(&peer->peer_addr, peer->lladdr); | |
682 | ||
683 | spin_lock(&devices_lock); | |
684 | INIT_LIST_HEAD(&peer->list); | |
685 | peer_add(dev, peer); | |
686 | spin_unlock(&devices_lock); | |
687 | ||
688 | /* Notifying peers about us needs to be done without locks held */ | |
689 | if (new_netdev) | |
690 | INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers); | |
691 | schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100)); | |
692 | ||
693 | return peer->chan; | |
694 | } | |
695 | ||
696 | static int setup_netdev(struct l2cap_chan *chan, struct lowpan_btle_dev **dev) | |
697 | { | |
698 | struct net_device *netdev; | |
699 | int err = 0; | |
700 | ||
701 | netdev = alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_btle_dev)), | |
702 | IFACE_NAME_TEMPLATE, NET_NAME_UNKNOWN, | |
703 | netdev_setup); | |
704 | if (!netdev) | |
705 | return -ENOMEM; | |
706 | ||
707 | netdev->addr_assign_type = NET_ADDR_PERM; | |
708 | baswap((void *)netdev->dev_addr, &chan->src); | |
709 | ||
710 | netdev->netdev_ops = &netdev_ops; | |
711 | SET_NETDEV_DEV(netdev, &chan->conn->hcon->hdev->dev); | |
712 | SET_NETDEV_DEVTYPE(netdev, &bt_type); | |
713 | ||
714 | *dev = lowpan_btle_dev(netdev); | |
715 | (*dev)->netdev = netdev; | |
716 | (*dev)->hdev = chan->conn->hcon->hdev; | |
717 | INIT_LIST_HEAD(&(*dev)->peers); | |
718 | ||
719 | spin_lock(&devices_lock); | |
720 | INIT_LIST_HEAD(&(*dev)->list); | |
721 | list_add_rcu(&(*dev)->list, &bt_6lowpan_devices); | |
722 | spin_unlock(&devices_lock); | |
723 | ||
724 | err = lowpan_register_netdev(netdev, LOWPAN_LLTYPE_BTLE); | |
725 | if (err < 0) { | |
726 | BT_INFO("register_netdev failed %d", err); | |
727 | spin_lock(&devices_lock); | |
728 | list_del_rcu(&(*dev)->list); | |
729 | spin_unlock(&devices_lock); | |
730 | free_netdev(netdev); | |
731 | goto out; | |
732 | } | |
733 | ||
734 | BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d", | |
735 | netdev->ifindex, &chan->dst, chan->dst_type, | |
736 | &chan->src, chan->src_type); | |
737 | set_bit(__LINK_STATE_PRESENT, &netdev->state); | |
738 | ||
739 | return 0; | |
740 | ||
741 | out: | |
742 | return err; | |
743 | } | |
744 | ||
745 | static inline void chan_ready_cb(struct l2cap_chan *chan) | |
746 | { | |
747 | struct lowpan_btle_dev *dev; | |
748 | bool new_netdev = false; | |
749 | ||
750 | dev = lookup_dev(chan->conn); | |
751 | ||
752 | BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev); | |
753 | ||
754 | if (!dev) { | |
755 | if (setup_netdev(chan, &dev) < 0) { | |
756 | l2cap_chan_del(chan, -ENOENT); | |
757 | return; | |
758 | } | |
759 | new_netdev = true; | |
760 | } | |
761 | ||
762 | if (!try_module_get(THIS_MODULE)) | |
763 | return; | |
764 | ||
765 | add_peer_chan(chan, dev, new_netdev); | |
766 | ifup(dev->netdev); | |
767 | } | |
768 | ||
769 | static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan) | |
770 | { | |
771 | struct l2cap_chan *chan; | |
772 | ||
773 | chan = chan_create(); | |
774 | if (!chan) | |
775 | return NULL; | |
776 | ||
777 | chan->ops = pchan->ops; | |
778 | ||
779 | BT_DBG("chan %p pchan %p", chan, pchan); | |
780 | ||
781 | return chan; | |
782 | } | |
783 | ||
784 | static void delete_netdev(struct work_struct *work) | |
785 | { | |
786 | struct lowpan_btle_dev *entry = container_of(work, | |
787 | struct lowpan_btle_dev, | |
788 | delete_netdev); | |
789 | ||
790 | lowpan_unregister_netdev(entry->netdev); | |
791 | ||
792 | /* The entry pointer is deleted by the netdev destructor. */ | |
793 | } | |
794 | ||
795 | static void chan_close_cb(struct l2cap_chan *chan) | |
796 | { | |
797 | struct lowpan_btle_dev *entry; | |
798 | struct lowpan_btle_dev *dev = NULL; | |
799 | struct lowpan_peer *peer; | |
800 | int err = -ENOENT; | |
801 | bool last = false, remove = true; | |
802 | ||
803 | BT_DBG("chan %p conn %p", chan, chan->conn); | |
804 | ||
805 | if (chan->conn && chan->conn->hcon) { | |
806 | if (!is_bt_6lowpan(chan->conn->hcon)) | |
807 | return; | |
808 | ||
809 | /* If conn is set, then the netdev is also there and we should | |
810 | * not remove it. | |
811 | */ | |
812 | remove = false; | |
813 | } | |
814 | ||
815 | spin_lock(&devices_lock); | |
816 | ||
817 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { | |
818 | dev = lowpan_btle_dev(entry->netdev); | |
819 | peer = __peer_lookup_chan(dev, chan); | |
820 | if (peer) { | |
821 | last = peer_del(dev, peer); | |
822 | err = 0; | |
823 | ||
824 | BT_DBG("dev %p removing %speer %p", dev, | |
825 | last ? "last " : "1 ", peer); | |
826 | BT_DBG("chan %p orig refcnt %d", chan, | |
827 | kref_read(&chan->kref)); | |
828 | ||
829 | l2cap_chan_put(chan); | |
830 | break; | |
831 | } | |
832 | } | |
833 | ||
834 | if (!err && last && dev && !atomic_read(&dev->peer_count)) { | |
835 | spin_unlock(&devices_lock); | |
836 | ||
837 | cancel_delayed_work_sync(&dev->notify_peers); | |
838 | ||
839 | ifdown(dev->netdev); | |
840 | ||
841 | if (remove) { | |
842 | INIT_WORK(&entry->delete_netdev, delete_netdev); | |
843 | schedule_work(&entry->delete_netdev); | |
844 | } | |
845 | } else { | |
846 | spin_unlock(&devices_lock); | |
847 | } | |
848 | ||
849 | return; | |
850 | } | |
851 | ||
852 | static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err) | |
853 | { | |
854 | BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn, | |
855 | state_to_string(state), err); | |
856 | } | |
857 | ||
858 | static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan, | |
859 | unsigned long hdr_len, | |
860 | unsigned long len, int nb) | |
861 | { | |
862 | /* Note that we must allocate using GFP_ATOMIC here as | |
863 | * this function is called originally from netdev hard xmit | |
864 | * function in atomic context. | |
865 | */ | |
866 | return bt_skb_alloc(hdr_len + len, GFP_ATOMIC); | |
867 | } | |
868 | ||
869 | static void chan_suspend_cb(struct l2cap_chan *chan) | |
870 | { | |
871 | struct lowpan_btle_dev *dev; | |
872 | ||
873 | BT_DBG("chan %p suspend", chan); | |
874 | ||
875 | dev = lookup_dev(chan->conn); | |
876 | if (!dev || !dev->netdev) | |
877 | return; | |
878 | ||
879 | netif_stop_queue(dev->netdev); | |
880 | } | |
881 | ||
882 | static void chan_resume_cb(struct l2cap_chan *chan) | |
883 | { | |
884 | struct lowpan_btle_dev *dev; | |
885 | ||
886 | BT_DBG("chan %p resume", chan); | |
887 | ||
888 | dev = lookup_dev(chan->conn); | |
889 | if (!dev || !dev->netdev) | |
890 | return; | |
891 | ||
892 | netif_wake_queue(dev->netdev); | |
893 | } | |
894 | ||
895 | static long chan_get_sndtimeo_cb(struct l2cap_chan *chan) | |
896 | { | |
897 | return L2CAP_CONN_TIMEOUT; | |
898 | } | |
899 | ||
900 | static const struct l2cap_ops bt_6lowpan_chan_ops = { | |
901 | .name = "L2CAP 6LoWPAN channel", | |
902 | .new_connection = chan_new_conn_cb, | |
903 | .recv = chan_recv_cb, | |
904 | .close = chan_close_cb, | |
905 | .state_change = chan_state_change_cb, | |
906 | .ready = chan_ready_cb, | |
907 | .resume = chan_resume_cb, | |
908 | .suspend = chan_suspend_cb, | |
909 | .get_sndtimeo = chan_get_sndtimeo_cb, | |
910 | .alloc_skb = chan_alloc_skb_cb, | |
911 | ||
912 | .teardown = l2cap_chan_no_teardown, | |
913 | .defer = l2cap_chan_no_defer, | |
914 | .set_shutdown = l2cap_chan_no_set_shutdown, | |
915 | }; | |
916 | ||
917 | static inline __u8 bdaddr_type(__u8 type) | |
918 | { | |
919 | if (type == ADDR_LE_DEV_PUBLIC) | |
920 | return BDADDR_LE_PUBLIC; | |
921 | else | |
922 | return BDADDR_LE_RANDOM; | |
923 | } | |
924 | ||
925 | static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type) | |
926 | { | |
927 | struct l2cap_chan *chan; | |
928 | int err; | |
929 | ||
930 | chan = chan_create(); | |
931 | if (!chan) | |
932 | return -EINVAL; | |
933 | ||
934 | chan->ops = &bt_6lowpan_chan_ops; | |
935 | ||
936 | err = l2cap_chan_connect(chan, cpu_to_le16(L2CAP_PSM_IPSP), 0, | |
937 | addr, dst_type); | |
938 | ||
939 | BT_DBG("chan %p err %d", chan, err); | |
940 | if (err < 0) | |
941 | l2cap_chan_put(chan); | |
942 | ||
943 | return err; | |
944 | } | |
945 | ||
946 | static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type) | |
947 | { | |
948 | struct lowpan_peer *peer; | |
949 | ||
950 | BT_DBG("conn %p dst type %d", conn, dst_type); | |
951 | ||
952 | peer = lookup_peer(conn); | |
953 | if (!peer) | |
954 | return -ENOENT; | |
955 | ||
956 | BT_DBG("peer %p chan %p", peer, peer->chan); | |
957 | ||
958 | l2cap_chan_close(peer->chan, ENOENT); | |
959 | ||
960 | return 0; | |
961 | } | |
962 | ||
963 | static struct l2cap_chan *bt_6lowpan_listen(void) | |
964 | { | |
965 | bdaddr_t *addr = BDADDR_ANY; | |
966 | struct l2cap_chan *chan; | |
967 | int err; | |
968 | ||
969 | if (!enable_6lowpan) | |
970 | return NULL; | |
971 | ||
972 | chan = chan_create(); | |
973 | if (!chan) | |
974 | return NULL; | |
975 | ||
976 | chan->ops = &bt_6lowpan_chan_ops; | |
977 | chan->state = BT_LISTEN; | |
978 | chan->src_type = BDADDR_LE_PUBLIC; | |
979 | ||
980 | atomic_set(&chan->nesting, L2CAP_NESTING_PARENT); | |
981 | ||
982 | BT_DBG("chan %p src type %d", chan, chan->src_type); | |
983 | ||
984 | err = l2cap_add_psm(chan, addr, cpu_to_le16(L2CAP_PSM_IPSP)); | |
985 | if (err) { | |
986 | l2cap_chan_put(chan); | |
987 | BT_ERR("psm cannot be added err %d", err); | |
988 | return NULL; | |
989 | } | |
990 | ||
991 | return chan; | |
992 | } | |
993 | ||
994 | static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type, | |
995 | struct l2cap_conn **conn) | |
996 | { | |
997 | struct hci_conn *hcon; | |
998 | struct hci_dev *hdev; | |
999 | int n; | |
1000 | ||
1001 | n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu", | |
1002 | &addr->b[5], &addr->b[4], &addr->b[3], | |
1003 | &addr->b[2], &addr->b[1], &addr->b[0], | |
1004 | addr_type); | |
1005 | ||
1006 | if (n < 7) | |
1007 | return -EINVAL; | |
1008 | ||
1009 | /* The LE_PUBLIC address type is ignored because of BDADDR_ANY */ | |
1010 | hdev = hci_get_route(addr, BDADDR_ANY, BDADDR_LE_PUBLIC); | |
1011 | if (!hdev) | |
1012 | return -ENOENT; | |
1013 | ||
1014 | hci_dev_lock(hdev); | |
1015 | hcon = hci_conn_hash_lookup_le(hdev, addr, *addr_type); | |
1016 | hci_dev_unlock(hdev); | |
1017 | ||
1018 | if (!hcon) | |
1019 | return -ENOENT; | |
1020 | ||
1021 | *conn = (struct l2cap_conn *)hcon->l2cap_data; | |
1022 | ||
1023 | BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type); | |
1024 | ||
1025 | return 0; | |
1026 | } | |
1027 | ||
1028 | static void disconnect_all_peers(void) | |
1029 | { | |
1030 | struct lowpan_btle_dev *entry; | |
1031 | struct lowpan_peer *peer, *tmp_peer, *new_peer; | |
1032 | struct list_head peers; | |
1033 | ||
1034 | INIT_LIST_HEAD(&peers); | |
1035 | ||
1036 | /* We make a separate list of peers as the close_cb() will | |
1037 | * modify the device peers list so it is better not to mess | |
1038 | * with the same list at the same time. | |
1039 | */ | |
1040 | ||
1041 | rcu_read_lock(); | |
1042 | ||
1043 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { | |
1044 | list_for_each_entry_rcu(peer, &entry->peers, list) { | |
1045 | new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC); | |
1046 | if (!new_peer) | |
1047 | break; | |
1048 | ||
1049 | new_peer->chan = peer->chan; | |
1050 | INIT_LIST_HEAD(&new_peer->list); | |
1051 | ||
1052 | list_add(&new_peer->list, &peers); | |
1053 | } | |
1054 | } | |
1055 | ||
1056 | rcu_read_unlock(); | |
1057 | ||
1058 | spin_lock(&devices_lock); | |
1059 | list_for_each_entry_safe(peer, tmp_peer, &peers, list) { | |
1060 | l2cap_chan_close(peer->chan, ENOENT); | |
1061 | ||
1062 | list_del_rcu(&peer->list); | |
1063 | kfree_rcu(peer, rcu); | |
1064 | } | |
1065 | spin_unlock(&devices_lock); | |
1066 | } | |
1067 | ||
1068 | struct set_enable { | |
1069 | struct work_struct work; | |
1070 | bool flag; | |
1071 | }; | |
1072 | ||
1073 | static void do_enable_set(struct work_struct *work) | |
1074 | { | |
1075 | struct set_enable *set_enable = container_of(work, | |
1076 | struct set_enable, work); | |
1077 | ||
1078 | if (!set_enable->flag || enable_6lowpan != set_enable->flag) | |
1079 | /* Disconnect existing connections if 6lowpan is | |
1080 | * disabled | |
1081 | */ | |
1082 | disconnect_all_peers(); | |
1083 | ||
1084 | enable_6lowpan = set_enable->flag; | |
1085 | ||
1086 | if (listen_chan) { | |
1087 | l2cap_chan_close(listen_chan, 0); | |
1088 | l2cap_chan_put(listen_chan); | |
1089 | } | |
1090 | ||
1091 | listen_chan = bt_6lowpan_listen(); | |
1092 | ||
1093 | kfree(set_enable); | |
1094 | } | |
1095 | ||
1096 | static int lowpan_enable_set(void *data, u64 val) | |
1097 | { | |
1098 | struct set_enable *set_enable; | |
1099 | ||
1100 | set_enable = kzalloc(sizeof(*set_enable), GFP_KERNEL); | |
1101 | if (!set_enable) | |
1102 | return -ENOMEM; | |
1103 | ||
1104 | set_enable->flag = !!val; | |
1105 | INIT_WORK(&set_enable->work, do_enable_set); | |
1106 | ||
1107 | schedule_work(&set_enable->work); | |
1108 | ||
1109 | return 0; | |
1110 | } | |
1111 | ||
1112 | static int lowpan_enable_get(void *data, u64 *val) | |
1113 | { | |
1114 | *val = enable_6lowpan; | |
1115 | return 0; | |
1116 | } | |
1117 | ||
1118 | DEFINE_SIMPLE_ATTRIBUTE(lowpan_enable_fops, lowpan_enable_get, | |
1119 | lowpan_enable_set, "%llu\n"); | |
1120 | ||
1121 | static ssize_t lowpan_control_write(struct file *fp, | |
1122 | const char __user *user_buffer, | |
1123 | size_t count, | |
1124 | loff_t *position) | |
1125 | { | |
1126 | char buf[32]; | |
1127 | size_t buf_size = min(count, sizeof(buf) - 1); | |
1128 | int ret; | |
1129 | bdaddr_t addr; | |
1130 | u8 addr_type; | |
1131 | struct l2cap_conn *conn = NULL; | |
1132 | ||
1133 | if (copy_from_user(buf, user_buffer, buf_size)) | |
1134 | return -EFAULT; | |
1135 | ||
1136 | buf[buf_size] = '\0'; | |
1137 | ||
1138 | if (memcmp(buf, "connect ", 8) == 0) { | |
1139 | ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn); | |
1140 | if (ret == -EINVAL) | |
1141 | return ret; | |
1142 | ||
1143 | if (listen_chan) { | |
1144 | l2cap_chan_close(listen_chan, 0); | |
1145 | l2cap_chan_put(listen_chan); | |
1146 | listen_chan = NULL; | |
1147 | } | |
1148 | ||
1149 | if (conn) { | |
1150 | struct lowpan_peer *peer; | |
1151 | ||
1152 | if (!is_bt_6lowpan(conn->hcon)) | |
1153 | return -EINVAL; | |
1154 | ||
1155 | peer = lookup_peer(conn); | |
1156 | if (peer) { | |
1157 | BT_DBG("6LoWPAN connection already exists"); | |
1158 | return -EALREADY; | |
1159 | } | |
1160 | ||
1161 | BT_DBG("conn %p dst %pMR type %d user %d", conn, | |
1162 | &conn->hcon->dst, conn->hcon->dst_type, | |
1163 | addr_type); | |
1164 | } | |
1165 | ||
1166 | ret = bt_6lowpan_connect(&addr, addr_type); | |
1167 | if (ret < 0) | |
1168 | return ret; | |
1169 | ||
1170 | return count; | |
1171 | } | |
1172 | ||
1173 | if (memcmp(buf, "disconnect ", 11) == 0) { | |
1174 | ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn); | |
1175 | if (ret < 0) | |
1176 | return ret; | |
1177 | ||
1178 | ret = bt_6lowpan_disconnect(conn, addr_type); | |
1179 | if (ret < 0) | |
1180 | return ret; | |
1181 | ||
1182 | return count; | |
1183 | } | |
1184 | ||
1185 | return count; | |
1186 | } | |
1187 | ||
1188 | static int lowpan_control_show(struct seq_file *f, void *ptr) | |
1189 | { | |
1190 | struct lowpan_btle_dev *entry; | |
1191 | struct lowpan_peer *peer; | |
1192 | ||
1193 | spin_lock(&devices_lock); | |
1194 | ||
1195 | list_for_each_entry(entry, &bt_6lowpan_devices, list) { | |
1196 | list_for_each_entry(peer, &entry->peers, list) | |
1197 | seq_printf(f, "%pMR (type %u)\n", | |
1198 | &peer->chan->dst, peer->chan->dst_type); | |
1199 | } | |
1200 | ||
1201 | spin_unlock(&devices_lock); | |
1202 | ||
1203 | return 0; | |
1204 | } | |
1205 | ||
1206 | static int lowpan_control_open(struct inode *inode, struct file *file) | |
1207 | { | |
1208 | return single_open(file, lowpan_control_show, inode->i_private); | |
1209 | } | |
1210 | ||
1211 | static const struct file_operations lowpan_control_fops = { | |
1212 | .open = lowpan_control_open, | |
1213 | .read = seq_read, | |
1214 | .write = lowpan_control_write, | |
1215 | .llseek = seq_lseek, | |
1216 | .release = single_release, | |
1217 | }; | |
1218 | ||
1219 | static void disconnect_devices(void) | |
1220 | { | |
1221 | struct lowpan_btle_dev *entry, *tmp, *new_dev; | |
1222 | struct list_head devices; | |
1223 | ||
1224 | INIT_LIST_HEAD(&devices); | |
1225 | ||
1226 | /* We make a separate list of devices because the unregister_netdev() | |
1227 | * will call device_event() which will also want to modify the same | |
1228 | * devices list. | |
1229 | */ | |
1230 | ||
1231 | rcu_read_lock(); | |
1232 | ||
1233 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { | |
1234 | new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC); | |
1235 | if (!new_dev) | |
1236 | break; | |
1237 | ||
1238 | new_dev->netdev = entry->netdev; | |
1239 | INIT_LIST_HEAD(&new_dev->list); | |
1240 | ||
1241 | list_add_rcu(&new_dev->list, &devices); | |
1242 | } | |
1243 | ||
1244 | rcu_read_unlock(); | |
1245 | ||
1246 | list_for_each_entry_safe(entry, tmp, &devices, list) { | |
1247 | ifdown(entry->netdev); | |
1248 | BT_DBG("Unregistering netdev %s %p", | |
1249 | entry->netdev->name, entry->netdev); | |
1250 | lowpan_unregister_netdev(entry->netdev); | |
1251 | kfree(entry); | |
1252 | } | |
1253 | } | |
1254 | ||
1255 | static int device_event(struct notifier_block *unused, | |
1256 | unsigned long event, void *ptr) | |
1257 | { | |
1258 | struct net_device *netdev = netdev_notifier_info_to_dev(ptr); | |
1259 | struct lowpan_btle_dev *entry; | |
1260 | ||
1261 | if (netdev->type != ARPHRD_6LOWPAN) | |
1262 | return NOTIFY_DONE; | |
1263 | ||
1264 | switch (event) { | |
1265 | case NETDEV_UNREGISTER: | |
1266 | spin_lock(&devices_lock); | |
1267 | list_for_each_entry(entry, &bt_6lowpan_devices, list) { | |
1268 | if (entry->netdev == netdev) { | |
1269 | BT_DBG("Unregistered netdev %s %p", | |
1270 | netdev->name, netdev); | |
1271 | list_del(&entry->list); | |
1272 | break; | |
1273 | } | |
1274 | } | |
1275 | spin_unlock(&devices_lock); | |
1276 | break; | |
1277 | } | |
1278 | ||
1279 | return NOTIFY_DONE; | |
1280 | } | |
1281 | ||
1282 | static struct notifier_block bt_6lowpan_dev_notifier = { | |
1283 | .notifier_call = device_event, | |
1284 | }; | |
1285 | ||
1286 | static int __init bt_6lowpan_init(void) | |
1287 | { | |
1288 | lowpan_enable_debugfs = debugfs_create_file("6lowpan_enable", 0644, | |
1289 | bt_debugfs, NULL, | |
1290 | &lowpan_enable_fops); | |
1291 | lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644, | |
1292 | bt_debugfs, NULL, | |
1293 | &lowpan_control_fops); | |
1294 | ||
1295 | return register_netdevice_notifier(&bt_6lowpan_dev_notifier); | |
1296 | } | |
1297 | ||
1298 | static void __exit bt_6lowpan_exit(void) | |
1299 | { | |
1300 | debugfs_remove(lowpan_enable_debugfs); | |
1301 | debugfs_remove(lowpan_control_debugfs); | |
1302 | ||
1303 | if (listen_chan) { | |
1304 | l2cap_chan_close(listen_chan, 0); | |
1305 | l2cap_chan_put(listen_chan); | |
1306 | } | |
1307 | ||
1308 | disconnect_devices(); | |
1309 | ||
1310 | unregister_netdevice_notifier(&bt_6lowpan_dev_notifier); | |
1311 | } | |
1312 | ||
1313 | module_init(bt_6lowpan_init); | |
1314 | module_exit(bt_6lowpan_exit); | |
1315 | ||
1316 | MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>"); | |
1317 | MODULE_DESCRIPTION("Bluetooth 6LoWPAN"); | |
1318 | MODULE_VERSION(VERSION); | |
1319 | MODULE_LICENSE("GPL"); |