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Commit | Line | Data |
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18722c24 | 1 | /* |
6b8d4a6a | 2 | Copyright (c) 2013-2014 Intel Corp. |
18722c24 JR |
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 | ||
18722c24 JR |
14 | #include <linux/if_arp.h> |
15 | #include <linux/netdevice.h> | |
16 | #include <linux/etherdevice.h> | |
5547e48c | 17 | #include <linux/module.h> |
6b8d4a6a | 18 | #include <linux/debugfs.h> |
18722c24 JR |
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 | ||
cefc8c8a | 30 | #include <net/6lowpan.h> /* for the compression support */ |
18722c24 | 31 | |
6b8d4a6a JR |
32 | #define VERSION "0.1" |
33 | ||
34 | static struct dentry *lowpan_psm_debugfs; | |
35 | static struct dentry *lowpan_control_debugfs; | |
36 | ||
18722c24 JR |
37 | #define IFACE_NAME_TEMPLATE "bt%d" |
38 | #define EUI64_ADDR_LEN 8 | |
39 | ||
40 | struct skb_cb { | |
41 | struct in6_addr addr; | |
6b8d4a6a JR |
42 | struct l2cap_chan *chan; |
43 | int status; | |
18722c24 JR |
44 | }; |
45 | #define lowpan_cb(skb) ((struct skb_cb *)((skb)->cb)) | |
46 | ||
47 | /* The devices list contains those devices that we are acting | |
48 | * as a proxy. The BT 6LoWPAN device is a virtual device that | |
49 | * connects to the Bluetooth LE device. The real connection to | |
50 | * BT device is done via l2cap layer. There exists one | |
51 | * virtual device / one BT 6LoWPAN network (=hciX device). | |
52 | * The list contains struct lowpan_dev elements. | |
53 | */ | |
54 | static LIST_HEAD(bt_6lowpan_devices); | |
55 | static DEFINE_RWLOCK(devices_lock); | |
56 | ||
6b8d4a6a JR |
57 | /* If psm is set to 0 (default value), then 6lowpan is disabled. |
58 | * Other values are used to indicate a Protocol Service Multiplexer | |
59 | * value for 6lowpan. | |
60 | */ | |
61 | static u16 psm_6lowpan; | |
62 | ||
63 | /* We are listening incoming connections via this channel | |
64 | */ | |
65 | static struct l2cap_chan *listen_chan; | |
66 | ||
18722c24 JR |
67 | struct lowpan_peer { |
68 | struct list_head list; | |
6b8d4a6a | 69 | struct l2cap_chan *chan; |
18722c24 JR |
70 | |
71 | /* peer addresses in various formats */ | |
72 | unsigned char eui64_addr[EUI64_ADDR_LEN]; | |
73 | struct in6_addr peer_addr; | |
74 | }; | |
75 | ||
76 | struct lowpan_dev { | |
77 | struct list_head list; | |
78 | ||
79 | struct hci_dev *hdev; | |
80 | struct net_device *netdev; | |
81 | struct list_head peers; | |
82 | atomic_t peer_count; /* number of items in peers list */ | |
83 | ||
84 | struct work_struct delete_netdev; | |
85 | struct delayed_work notify_peers; | |
86 | }; | |
87 | ||
88 | static inline struct lowpan_dev *lowpan_dev(const struct net_device *netdev) | |
89 | { | |
90 | return netdev_priv(netdev); | |
91 | } | |
92 | ||
93 | static inline void peer_add(struct lowpan_dev *dev, struct lowpan_peer *peer) | |
94 | { | |
95 | list_add(&peer->list, &dev->peers); | |
96 | atomic_inc(&dev->peer_count); | |
97 | } | |
98 | ||
99 | static inline bool peer_del(struct lowpan_dev *dev, struct lowpan_peer *peer) | |
100 | { | |
101 | list_del(&peer->list); | |
102 | ||
18d93c17 JR |
103 | module_put(THIS_MODULE); |
104 | ||
18722c24 JR |
105 | if (atomic_dec_and_test(&dev->peer_count)) { |
106 | BT_DBG("last peer"); | |
107 | return true; | |
108 | } | |
109 | ||
110 | return false; | |
111 | } | |
112 | ||
113 | static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_dev *dev, | |
114 | bdaddr_t *ba, __u8 type) | |
115 | { | |
116 | struct lowpan_peer *peer, *tmp; | |
117 | ||
118 | BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count), | |
119 | ba, type); | |
120 | ||
121 | list_for_each_entry_safe(peer, tmp, &dev->peers, list) { | |
6b8d4a6a JR |
122 | BT_DBG("dst addr %pMR dst type %d", |
123 | &peer->chan->dst, peer->chan->dst_type); | |
18722c24 | 124 | |
6b8d4a6a | 125 | if (bacmp(&peer->chan->dst, ba)) |
18722c24 JR |
126 | continue; |
127 | ||
6b8d4a6a JR |
128 | if (type == peer->chan->dst_type) |
129 | return peer; | |
130 | } | |
131 | ||
132 | return NULL; | |
133 | } | |
134 | ||
135 | static inline struct lowpan_peer *peer_lookup_chan(struct lowpan_dev *dev, | |
136 | struct l2cap_chan *chan) | |
137 | { | |
138 | struct lowpan_peer *peer, *tmp; | |
139 | ||
140 | list_for_each_entry_safe(peer, tmp, &dev->peers, list) { | |
141 | if (peer->chan == chan) | |
18722c24 JR |
142 | return peer; |
143 | } | |
144 | ||
145 | return NULL; | |
146 | } | |
147 | ||
148 | static inline struct lowpan_peer *peer_lookup_conn(struct lowpan_dev *dev, | |
149 | struct l2cap_conn *conn) | |
150 | { | |
151 | struct lowpan_peer *peer, *tmp; | |
152 | ||
153 | list_for_each_entry_safe(peer, tmp, &dev->peers, list) { | |
6b8d4a6a | 154 | if (peer->chan->conn == conn) |
18722c24 JR |
155 | return peer; |
156 | } | |
157 | ||
158 | return NULL; | |
159 | } | |
160 | ||
161 | static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn) | |
162 | { | |
163 | struct lowpan_dev *entry, *tmp; | |
164 | struct lowpan_peer *peer = NULL; | |
165 | unsigned long flags; | |
166 | ||
167 | read_lock_irqsave(&devices_lock, flags); | |
168 | ||
169 | list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) { | |
170 | peer = peer_lookup_conn(entry, conn); | |
171 | if (peer) | |
172 | break; | |
173 | } | |
174 | ||
175 | read_unlock_irqrestore(&devices_lock, flags); | |
176 | ||
177 | return peer; | |
178 | } | |
179 | ||
180 | static struct lowpan_dev *lookup_dev(struct l2cap_conn *conn) | |
181 | { | |
182 | struct lowpan_dev *entry, *tmp; | |
183 | struct lowpan_dev *dev = NULL; | |
184 | unsigned long flags; | |
185 | ||
186 | read_lock_irqsave(&devices_lock, flags); | |
187 | ||
188 | list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) { | |
189 | if (conn->hcon->hdev == entry->hdev) { | |
190 | dev = entry; | |
191 | break; | |
192 | } | |
193 | } | |
194 | ||
195 | read_unlock_irqrestore(&devices_lock, flags); | |
196 | ||
197 | return dev; | |
198 | } | |
199 | ||
18722c24 JR |
200 | static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev) |
201 | { | |
202 | struct sk_buff *skb_cp; | |
203 | int ret; | |
204 | ||
205 | skb_cp = skb_copy(skb, GFP_ATOMIC); | |
206 | if (!skb_cp) | |
207 | return -ENOMEM; | |
208 | ||
209 | ret = netif_rx(skb_cp); | |
6b8d4a6a JR |
210 | if (ret < 0) { |
211 | BT_DBG("receive skb %d", ret); | |
18722c24 | 212 | return NET_RX_DROP; |
6b8d4a6a | 213 | } |
18722c24 JR |
214 | |
215 | return ret; | |
216 | } | |
217 | ||
218 | static int process_data(struct sk_buff *skb, struct net_device *netdev, | |
6b8d4a6a | 219 | struct l2cap_chan *chan) |
18722c24 JR |
220 | { |
221 | const u8 *saddr, *daddr; | |
222 | u8 iphc0, iphc1; | |
223 | struct lowpan_dev *dev; | |
224 | struct lowpan_peer *peer; | |
225 | unsigned long flags; | |
226 | ||
227 | dev = lowpan_dev(netdev); | |
228 | ||
229 | read_lock_irqsave(&devices_lock, flags); | |
6b8d4a6a | 230 | peer = peer_lookup_chan(dev, chan); |
18722c24 JR |
231 | read_unlock_irqrestore(&devices_lock, flags); |
232 | if (!peer) | |
233 | goto drop; | |
234 | ||
235 | saddr = peer->eui64_addr; | |
236 | daddr = dev->netdev->dev_addr; | |
237 | ||
238 | /* at least two bytes will be used for the encoding */ | |
239 | if (skb->len < 2) | |
240 | goto drop; | |
241 | ||
242 | if (lowpan_fetch_skb_u8(skb, &iphc0)) | |
243 | goto drop; | |
244 | ||
245 | if (lowpan_fetch_skb_u8(skb, &iphc1)) | |
246 | goto drop; | |
247 | ||
248 | return lowpan_process_data(skb, netdev, | |
249 | saddr, IEEE802154_ADDR_LONG, EUI64_ADDR_LEN, | |
250 | daddr, IEEE802154_ADDR_LONG, EUI64_ADDR_LEN, | |
251 | iphc0, iphc1, give_skb_to_upper); | |
252 | ||
253 | drop: | |
254 | kfree_skb(skb); | |
255 | return -EINVAL; | |
256 | } | |
257 | ||
258 | static int recv_pkt(struct sk_buff *skb, struct net_device *dev, | |
6b8d4a6a | 259 | struct l2cap_chan *chan) |
18722c24 JR |
260 | { |
261 | struct sk_buff *local_skb; | |
262 | int ret; | |
263 | ||
264 | if (!netif_running(dev)) | |
265 | goto drop; | |
266 | ||
267 | if (dev->type != ARPHRD_6LOWPAN) | |
268 | goto drop; | |
269 | ||
270 | /* check that it's our buffer */ | |
271 | if (skb->data[0] == LOWPAN_DISPATCH_IPV6) { | |
272 | /* Copy the packet so that the IPv6 header is | |
273 | * properly aligned. | |
274 | */ | |
275 | local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1, | |
276 | skb_tailroom(skb), GFP_ATOMIC); | |
277 | if (!local_skb) | |
278 | goto drop; | |
279 | ||
280 | local_skb->protocol = htons(ETH_P_IPV6); | |
281 | local_skb->pkt_type = PACKET_HOST; | |
282 | ||
283 | skb_reset_network_header(local_skb); | |
284 | skb_set_transport_header(local_skb, sizeof(struct ipv6hdr)); | |
285 | ||
286 | if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) { | |
287 | kfree_skb(local_skb); | |
288 | goto drop; | |
289 | } | |
290 | ||
291 | dev->stats.rx_bytes += skb->len; | |
292 | dev->stats.rx_packets++; | |
293 | ||
294 | kfree_skb(local_skb); | |
295 | kfree_skb(skb); | |
296 | } else { | |
297 | switch (skb->data[0] & 0xe0) { | |
298 | case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */ | |
299 | local_skb = skb_clone(skb, GFP_ATOMIC); | |
300 | if (!local_skb) | |
301 | goto drop; | |
302 | ||
6b8d4a6a | 303 | ret = process_data(local_skb, dev, chan); |
18722c24 JR |
304 | if (ret != NET_RX_SUCCESS) |
305 | goto drop; | |
306 | ||
307 | dev->stats.rx_bytes += skb->len; | |
308 | dev->stats.rx_packets++; | |
309 | ||
310 | kfree_skb(skb); | |
311 | break; | |
312 | default: | |
313 | break; | |
314 | } | |
315 | } | |
316 | ||
317 | return NET_RX_SUCCESS; | |
318 | ||
319 | drop: | |
6b8d4a6a | 320 | dev->stats.rx_dropped++; |
18722c24 JR |
321 | kfree_skb(skb); |
322 | return NET_RX_DROP; | |
323 | } | |
324 | ||
325 | /* Packet from BT LE device */ | |
6b8d4a6a | 326 | static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
18722c24 JR |
327 | { |
328 | struct lowpan_dev *dev; | |
329 | struct lowpan_peer *peer; | |
330 | int err; | |
331 | ||
6b8d4a6a | 332 | peer = lookup_peer(chan->conn); |
18722c24 JR |
333 | if (!peer) |
334 | return -ENOENT; | |
335 | ||
6b8d4a6a | 336 | dev = lookup_dev(chan->conn); |
30d3db44 | 337 | if (!dev || !dev->netdev) |
18722c24 JR |
338 | return -ENOENT; |
339 | ||
6b8d4a6a JR |
340 | err = recv_pkt(skb, dev->netdev, chan); |
341 | if (err) { | |
342 | BT_DBG("recv pkt %d", err); | |
343 | err = -EAGAIN; | |
18722c24 JR |
344 | } |
345 | ||
6b8d4a6a | 346 | return err; |
18722c24 JR |
347 | } |
348 | ||
62bbd5b3 | 349 | static u8 get_addr_type_from_eui64(u8 byte) |
18722c24 | 350 | { |
6b8d4a6a JR |
351 | /* Is universal(0) or local(1) bit */ |
352 | return ((byte & 0x02) ? BDADDR_LE_RANDOM : BDADDR_LE_PUBLIC); | |
62bbd5b3 JR |
353 | } |
354 | ||
355 | static void copy_to_bdaddr(struct in6_addr *ip6_daddr, bdaddr_t *addr) | |
356 | { | |
357 | u8 *eui64 = ip6_daddr->s6_addr + 8; | |
18722c24 JR |
358 | |
359 | addr->b[0] = eui64[7]; | |
360 | addr->b[1] = eui64[6]; | |
361 | addr->b[2] = eui64[5]; | |
362 | addr->b[3] = eui64[2]; | |
363 | addr->b[4] = eui64[1]; | |
364 | addr->b[5] = eui64[0]; | |
62bbd5b3 | 365 | } |
18722c24 | 366 | |
62bbd5b3 JR |
367 | static void convert_dest_bdaddr(struct in6_addr *ip6_daddr, |
368 | bdaddr_t *addr, u8 *addr_type) | |
369 | { | |
370 | copy_to_bdaddr(ip6_daddr, addr); | |
18722c24 | 371 | |
62bbd5b3 JR |
372 | /* We need to toggle the U/L bit that we got from IPv6 address |
373 | * so that we get the proper address and type of the BD address. | |
374 | */ | |
375 | addr->b[5] ^= 0x02; | |
376 | ||
377 | *addr_type = get_addr_type_from_eui64(addr->b[5]); | |
18722c24 JR |
378 | } |
379 | ||
380 | static int header_create(struct sk_buff *skb, struct net_device *netdev, | |
381 | unsigned short type, const void *_daddr, | |
382 | const void *_saddr, unsigned int len) | |
383 | { | |
384 | struct ipv6hdr *hdr; | |
385 | struct lowpan_dev *dev; | |
386 | struct lowpan_peer *peer; | |
387 | bdaddr_t addr, *any = BDADDR_ANY; | |
388 | u8 *saddr, *daddr = any->b; | |
389 | u8 addr_type; | |
390 | ||
391 | if (type != ETH_P_IPV6) | |
392 | return -EINVAL; | |
393 | ||
394 | hdr = ipv6_hdr(skb); | |
395 | ||
396 | dev = lowpan_dev(netdev); | |
397 | ||
398 | if (ipv6_addr_is_multicast(&hdr->daddr)) { | |
399 | memcpy(&lowpan_cb(skb)->addr, &hdr->daddr, | |
400 | sizeof(struct in6_addr)); | |
6b8d4a6a | 401 | lowpan_cb(skb)->chan = NULL; |
18722c24 JR |
402 | } else { |
403 | unsigned long flags; | |
404 | ||
405 | /* Get destination BT device from skb. | |
406 | * If there is no such peer then discard the packet. | |
407 | */ | |
62bbd5b3 | 408 | convert_dest_bdaddr(&hdr->daddr, &addr, &addr_type); |
18722c24 | 409 | |
6b8d4a6a JR |
410 | BT_DBG("dest addr %pMR type %d IP %pI6c", &addr, |
411 | addr_type, &hdr->daddr); | |
18722c24 JR |
412 | |
413 | read_lock_irqsave(&devices_lock, flags); | |
414 | peer = peer_lookup_ba(dev, &addr, addr_type); | |
415 | read_unlock_irqrestore(&devices_lock, flags); | |
416 | ||
417 | if (!peer) { | |
418 | BT_DBG("no such peer %pMR found", &addr); | |
419 | return -ENOENT; | |
420 | } | |
421 | ||
422 | daddr = peer->eui64_addr; | |
423 | ||
424 | memcpy(&lowpan_cb(skb)->addr, &hdr->daddr, | |
425 | sizeof(struct in6_addr)); | |
6b8d4a6a | 426 | lowpan_cb(skb)->chan = peer->chan; |
18722c24 JR |
427 | } |
428 | ||
429 | saddr = dev->netdev->dev_addr; | |
430 | ||
431 | return lowpan_header_compress(skb, netdev, type, daddr, saddr, len); | |
432 | } | |
433 | ||
434 | /* Packet to BT LE device */ | |
6b8d4a6a | 435 | static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb, |
18722c24 JR |
436 | struct net_device *netdev) |
437 | { | |
6b8d4a6a JR |
438 | struct msghdr msg; |
439 | struct kvec iv; | |
440 | int err; | |
441 | ||
442 | /* Remember the skb so that we can send EAGAIN to the caller if | |
443 | * we run out of credits. | |
444 | */ | |
445 | chan->data = skb; | |
446 | ||
447 | memset(&msg, 0, sizeof(msg)); | |
448 | msg.msg_iov = (struct iovec *) &iv; | |
449 | msg.msg_iovlen = 1; | |
450 | iv.iov_base = skb->data; | |
451 | iv.iov_len = skb->len; | |
452 | ||
453 | err = l2cap_chan_send(chan, &msg, skb->len); | |
454 | if (err > 0) { | |
455 | netdev->stats.tx_bytes += err; | |
456 | netdev->stats.tx_packets++; | |
457 | return 0; | |
458 | } | |
459 | ||
460 | if (!err) | |
461 | err = lowpan_cb(skb)->status; | |
462 | ||
463 | if (err < 0) { | |
464 | if (err == -EAGAIN) | |
465 | netdev->stats.tx_dropped++; | |
466 | else | |
467 | netdev->stats.tx_errors++; | |
468 | } | |
18722c24 | 469 | |
6b8d4a6a | 470 | return err; |
18722c24 JR |
471 | } |
472 | ||
473 | static void send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev) | |
474 | { | |
475 | struct sk_buff *local_skb; | |
476 | struct lowpan_dev *entry, *tmp; | |
477 | unsigned long flags; | |
478 | ||
479 | read_lock_irqsave(&devices_lock, flags); | |
480 | ||
481 | list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) { | |
482 | struct lowpan_peer *pentry, *ptmp; | |
483 | struct lowpan_dev *dev; | |
484 | ||
485 | if (entry->netdev != netdev) | |
486 | continue; | |
487 | ||
488 | dev = lowpan_dev(entry->netdev); | |
489 | ||
490 | list_for_each_entry_safe(pentry, ptmp, &dev->peers, list) { | |
491 | local_skb = skb_clone(skb, GFP_ATOMIC); | |
492 | ||
6b8d4a6a | 493 | send_pkt(pentry->chan, local_skb, netdev); |
18722c24 JR |
494 | |
495 | kfree_skb(local_skb); | |
496 | } | |
497 | } | |
498 | ||
499 | read_unlock_irqrestore(&devices_lock, flags); | |
500 | } | |
501 | ||
502 | static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev) | |
503 | { | |
504 | int err = 0; | |
18722c24 JR |
505 | struct lowpan_dev *dev; |
506 | struct lowpan_peer *peer; | |
507 | bdaddr_t addr; | |
508 | u8 addr_type; | |
509 | ||
510 | if (ipv6_addr_is_multicast(&lowpan_cb(skb)->addr)) { | |
511 | /* We need to send the packet to every device | |
512 | * behind this interface. | |
513 | */ | |
514 | send_mcast_pkt(skb, netdev); | |
515 | } else { | |
516 | unsigned long flags; | |
517 | ||
62bbd5b3 | 518 | convert_dest_bdaddr(&lowpan_cb(skb)->addr, &addr, &addr_type); |
18722c24 JR |
519 | dev = lowpan_dev(netdev); |
520 | ||
521 | read_lock_irqsave(&devices_lock, flags); | |
522 | peer = peer_lookup_ba(dev, &addr, addr_type); | |
523 | read_unlock_irqrestore(&devices_lock, flags); | |
524 | ||
6b8d4a6a JR |
525 | BT_DBG("xmit %s to %pMR type %d IP %pI6c peer %p", |
526 | netdev->name, &addr, addr_type, | |
62bbd5b3 | 527 | &lowpan_cb(skb)->addr, peer); |
18722c24 | 528 | |
6b8d4a6a JR |
529 | if (peer && peer->chan) |
530 | err = send_pkt(peer->chan, skb, netdev); | |
531 | else | |
532 | err = -ENOENT; | |
18722c24 JR |
533 | } |
534 | dev_kfree_skb(skb); | |
535 | ||
536 | if (err) | |
537 | BT_DBG("ERROR: xmit failed (%d)", err); | |
538 | ||
539 | return (err < 0) ? NET_XMIT_DROP : err; | |
540 | } | |
541 | ||
542 | static const struct net_device_ops netdev_ops = { | |
543 | .ndo_start_xmit = bt_xmit, | |
544 | }; | |
545 | ||
546 | static struct header_ops header_ops = { | |
547 | .create = header_create, | |
548 | }; | |
549 | ||
550 | static void netdev_setup(struct net_device *dev) | |
551 | { | |
552 | dev->addr_len = EUI64_ADDR_LEN; | |
553 | dev->type = ARPHRD_6LOWPAN; | |
554 | ||
555 | dev->hard_header_len = 0; | |
556 | dev->needed_tailroom = 0; | |
557 | dev->mtu = IPV6_MIN_MTU; | |
558 | dev->tx_queue_len = 0; | |
559 | dev->flags = IFF_RUNNING | IFF_POINTOPOINT; | |
560 | dev->watchdog_timeo = 0; | |
561 | ||
562 | dev->netdev_ops = &netdev_ops; | |
563 | dev->header_ops = &header_ops; | |
564 | dev->destructor = free_netdev; | |
565 | } | |
566 | ||
567 | static struct device_type bt_type = { | |
568 | .name = "bluetooth", | |
569 | }; | |
570 | ||
571 | static void set_addr(u8 *eui, u8 *addr, u8 addr_type) | |
572 | { | |
573 | /* addr is the BT address in little-endian format */ | |
574 | eui[0] = addr[5]; | |
575 | eui[1] = addr[4]; | |
576 | eui[2] = addr[3]; | |
577 | eui[3] = 0xFF; | |
578 | eui[4] = 0xFE; | |
579 | eui[5] = addr[2]; | |
580 | eui[6] = addr[1]; | |
581 | eui[7] = addr[0]; | |
582 | ||
62bbd5b3 | 583 | /* Universal/local bit set, BT 6lowpan draft ch. 3.2.1 */ |
6b8d4a6a | 584 | if (addr_type == BDADDR_LE_PUBLIC) |
62bbd5b3 | 585 | eui[0] &= ~0x02; |
18722c24 | 586 | else |
62bbd5b3 JR |
587 | eui[0] |= 0x02; |
588 | ||
589 | BT_DBG("type %d addr %*phC", addr_type, 8, eui); | |
18722c24 JR |
590 | } |
591 | ||
592 | static void set_dev_addr(struct net_device *netdev, bdaddr_t *addr, | |
593 | u8 addr_type) | |
594 | { | |
595 | netdev->addr_assign_type = NET_ADDR_PERM; | |
596 | set_addr(netdev->dev_addr, addr->b, addr_type); | |
18722c24 JR |
597 | } |
598 | ||
599 | static void ifup(struct net_device *netdev) | |
600 | { | |
601 | int err; | |
602 | ||
603 | rtnl_lock(); | |
604 | err = dev_open(netdev); | |
605 | if (err < 0) | |
606 | BT_INFO("iface %s cannot be opened (%d)", netdev->name, err); | |
607 | rtnl_unlock(); | |
608 | } | |
609 | ||
7f118253 JR |
610 | static void ifdown(struct net_device *netdev) |
611 | { | |
612 | int err; | |
613 | ||
614 | rtnl_lock(); | |
615 | err = dev_close(netdev); | |
616 | if (err < 0) | |
617 | BT_INFO("iface %s cannot be closed (%d)", netdev->name, err); | |
618 | rtnl_unlock(); | |
619 | } | |
620 | ||
18722c24 JR |
621 | static void do_notify_peers(struct work_struct *work) |
622 | { | |
623 | struct lowpan_dev *dev = container_of(work, struct lowpan_dev, | |
624 | notify_peers.work); | |
625 | ||
626 | netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */ | |
627 | } | |
628 | ||
629 | static bool is_bt_6lowpan(struct hci_conn *hcon) | |
630 | { | |
631 | if (hcon->type != LE_LINK) | |
632 | return false; | |
633 | ||
6b8d4a6a JR |
634 | if (!psm_6lowpan) |
635 | return false; | |
636 | ||
637 | return true; | |
18722c24 JR |
638 | } |
639 | ||
6b8d4a6a JR |
640 | static struct l2cap_chan *chan_create(void) |
641 | { | |
642 | struct l2cap_chan *chan; | |
643 | ||
644 | chan = l2cap_chan_create(); | |
645 | if (!chan) | |
646 | return NULL; | |
647 | ||
648 | l2cap_chan_set_defaults(chan); | |
649 | ||
650 | chan->chan_type = L2CAP_CHAN_CONN_ORIENTED; | |
651 | chan->mode = L2CAP_MODE_LE_FLOWCTL; | |
652 | chan->omtu = 65535; | |
653 | chan->imtu = chan->omtu; | |
654 | ||
655 | return chan; | |
656 | } | |
657 | ||
658 | static struct l2cap_chan *chan_open(struct l2cap_chan *pchan) | |
659 | { | |
660 | struct l2cap_chan *chan; | |
661 | ||
662 | chan = chan_create(); | |
663 | if (!chan) | |
664 | return NULL; | |
665 | ||
666 | chan->remote_mps = chan->omtu; | |
667 | chan->mps = chan->omtu; | |
668 | ||
669 | chan->state = BT_CONNECTED; | |
670 | ||
671 | return chan; | |
672 | } | |
673 | ||
b2799cec JR |
674 | static void set_ip_addr_bits(u8 addr_type, u8 *addr) |
675 | { | |
676 | if (addr_type == BDADDR_LE_PUBLIC) | |
677 | *addr |= 0x02; | |
678 | else | |
679 | *addr &= ~0x02; | |
680 | } | |
681 | ||
6b8d4a6a JR |
682 | static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan, |
683 | struct lowpan_dev *dev) | |
18722c24 JR |
684 | { |
685 | struct lowpan_peer *peer; | |
686 | unsigned long flags; | |
687 | ||
688 | peer = kzalloc(sizeof(*peer), GFP_ATOMIC); | |
689 | if (!peer) | |
6b8d4a6a | 690 | return NULL; |
18722c24 | 691 | |
6b8d4a6a | 692 | peer->chan = chan; |
18722c24 JR |
693 | memset(&peer->peer_addr, 0, sizeof(struct in6_addr)); |
694 | ||
695 | /* RFC 2464 ch. 5 */ | |
696 | peer->peer_addr.s6_addr[0] = 0xFE; | |
697 | peer->peer_addr.s6_addr[1] = 0x80; | |
6b8d4a6a JR |
698 | set_addr((u8 *)&peer->peer_addr.s6_addr + 8, chan->dst.b, |
699 | chan->dst_type); | |
18722c24 JR |
700 | |
701 | memcpy(&peer->eui64_addr, (u8 *)&peer->peer_addr.s6_addr + 8, | |
702 | EUI64_ADDR_LEN); | |
18722c24 | 703 | |
b2799cec JR |
704 | /* IPv6 address needs to have the U/L bit set properly so toggle |
705 | * it back here. | |
706 | */ | |
707 | set_ip_addr_bits(chan->dst_type, (u8 *)&peer->peer_addr.s6_addr + 8); | |
708 | ||
18722c24 JR |
709 | write_lock_irqsave(&devices_lock, flags); |
710 | INIT_LIST_HEAD(&peer->list); | |
711 | peer_add(dev, peer); | |
712 | write_unlock_irqrestore(&devices_lock, flags); | |
713 | ||
714 | /* Notifying peers about us needs to be done without locks held */ | |
715 | INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers); | |
716 | schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100)); | |
717 | ||
6b8d4a6a | 718 | return peer->chan; |
18722c24 JR |
719 | } |
720 | ||
6b8d4a6a | 721 | static int setup_netdev(struct l2cap_chan *chan, struct lowpan_dev **dev) |
18722c24 | 722 | { |
18722c24 JR |
723 | struct net_device *netdev; |
724 | int err = 0; | |
725 | unsigned long flags; | |
726 | ||
6b8d4a6a | 727 | netdev = alloc_netdev(sizeof(struct lowpan_dev), IFACE_NAME_TEMPLATE, |
c835a677 | 728 | NET_NAME_UNKNOWN, netdev_setup); |
18722c24 JR |
729 | if (!netdev) |
730 | return -ENOMEM; | |
731 | ||
6b8d4a6a | 732 | set_dev_addr(netdev, &chan->src, chan->src_type); |
18722c24 JR |
733 | |
734 | netdev->netdev_ops = &netdev_ops; | |
6b8d4a6a | 735 | SET_NETDEV_DEV(netdev, &chan->conn->hcon->dev); |
18722c24 JR |
736 | SET_NETDEV_DEVTYPE(netdev, &bt_type); |
737 | ||
738 | err = register_netdev(netdev); | |
739 | if (err < 0) { | |
740 | BT_INFO("register_netdev failed %d", err); | |
741 | free_netdev(netdev); | |
742 | goto out; | |
743 | } | |
744 | ||
6b8d4a6a JR |
745 | BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d", |
746 | netdev->ifindex, &chan->dst, chan->dst_type, | |
747 | &chan->src, chan->src_type); | |
18722c24 JR |
748 | set_bit(__LINK_STATE_PRESENT, &netdev->state); |
749 | ||
6b8d4a6a JR |
750 | *dev = netdev_priv(netdev); |
751 | (*dev)->netdev = netdev; | |
752 | (*dev)->hdev = chan->conn->hcon->hdev; | |
753 | INIT_LIST_HEAD(&(*dev)->peers); | |
18722c24 JR |
754 | |
755 | write_lock_irqsave(&devices_lock, flags); | |
6b8d4a6a JR |
756 | INIT_LIST_HEAD(&(*dev)->list); |
757 | list_add(&(*dev)->list, &bt_6lowpan_devices); | |
18722c24 JR |
758 | write_unlock_irqrestore(&devices_lock, flags); |
759 | ||
6b8d4a6a | 760 | return 0; |
18722c24 JR |
761 | |
762 | out: | |
763 | return err; | |
764 | } | |
765 | ||
6b8d4a6a JR |
766 | static inline void chan_ready_cb(struct l2cap_chan *chan) |
767 | { | |
768 | struct lowpan_dev *dev; | |
769 | ||
770 | dev = lookup_dev(chan->conn); | |
771 | ||
772 | BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev); | |
773 | ||
774 | if (!dev) { | |
775 | if (setup_netdev(chan, &dev) < 0) { | |
776 | l2cap_chan_del(chan, -ENOENT); | |
777 | return; | |
778 | } | |
779 | } | |
780 | ||
18d93c17 JR |
781 | if (!try_module_get(THIS_MODULE)) |
782 | return; | |
783 | ||
6b8d4a6a JR |
784 | add_peer_chan(chan, dev); |
785 | ifup(dev->netdev); | |
786 | } | |
787 | ||
2b293490 | 788 | static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan) |
6b8d4a6a | 789 | { |
2b293490 | 790 | struct l2cap_chan *chan; |
6b8d4a6a | 791 | |
2b293490 JH |
792 | chan = chan_open(pchan); |
793 | chan->ops = pchan->ops; | |
6b8d4a6a JR |
794 | |
795 | BT_DBG("chan %p pchan %p", chan, pchan); | |
796 | ||
2b293490 | 797 | return chan; |
6b8d4a6a JR |
798 | } |
799 | ||
18722c24 JR |
800 | static void delete_netdev(struct work_struct *work) |
801 | { | |
802 | struct lowpan_dev *entry = container_of(work, struct lowpan_dev, | |
803 | delete_netdev); | |
804 | ||
805 | unregister_netdev(entry->netdev); | |
806 | ||
807 | /* The entry pointer is deleted in device_event() */ | |
808 | } | |
809 | ||
6b8d4a6a | 810 | static void chan_close_cb(struct l2cap_chan *chan) |
18722c24 JR |
811 | { |
812 | struct lowpan_dev *entry, *tmp; | |
813 | struct lowpan_dev *dev = NULL; | |
814 | struct lowpan_peer *peer; | |
815 | int err = -ENOENT; | |
816 | unsigned long flags; | |
6b8d4a6a | 817 | bool last = false, removed = true; |
18722c24 | 818 | |
6b8d4a6a JR |
819 | BT_DBG("chan %p conn %p", chan, chan->conn); |
820 | ||
821 | if (chan->conn && chan->conn->hcon) { | |
822 | if (!is_bt_6lowpan(chan->conn->hcon)) | |
823 | return; | |
824 | ||
825 | /* If conn is set, then the netdev is also there and we should | |
826 | * not remove it. | |
827 | */ | |
828 | removed = false; | |
829 | } | |
18722c24 JR |
830 | |
831 | write_lock_irqsave(&devices_lock, flags); | |
832 | ||
833 | list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) { | |
834 | dev = lowpan_dev(entry->netdev); | |
6b8d4a6a | 835 | peer = peer_lookup_chan(dev, chan); |
18722c24 JR |
836 | if (peer) { |
837 | last = peer_del(dev, peer); | |
838 | err = 0; | |
6b8d4a6a JR |
839 | |
840 | BT_DBG("dev %p removing %speer %p", dev, | |
841 | last ? "last " : "1 ", peer); | |
842 | BT_DBG("chan %p orig refcnt %d", chan, | |
843 | atomic_read(&chan->kref.refcount)); | |
844 | ||
845 | l2cap_chan_put(chan); | |
846 | kfree(peer); | |
18722c24 JR |
847 | break; |
848 | } | |
849 | } | |
850 | ||
851 | if (!err && last && dev && !atomic_read(&dev->peer_count)) { | |
852 | write_unlock_irqrestore(&devices_lock, flags); | |
853 | ||
854 | cancel_delayed_work_sync(&dev->notify_peers); | |
855 | ||
7f118253 JR |
856 | ifdown(dev->netdev); |
857 | ||
6b8d4a6a JR |
858 | if (!removed) { |
859 | INIT_WORK(&entry->delete_netdev, delete_netdev); | |
860 | schedule_work(&entry->delete_netdev); | |
861 | } | |
18722c24 JR |
862 | } else { |
863 | write_unlock_irqrestore(&devices_lock, flags); | |
864 | } | |
865 | ||
6b8d4a6a JR |
866 | return; |
867 | } | |
868 | ||
869 | static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err) | |
870 | { | |
871 | BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn, | |
872 | state_to_string(state), err); | |
873 | } | |
874 | ||
875 | static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan, | |
876 | unsigned long hdr_len, | |
877 | unsigned long len, int nb) | |
878 | { | |
879 | /* Note that we must allocate using GFP_ATOMIC here as | |
880 | * this function is called originally from netdev hard xmit | |
881 | * function in atomic context. | |
882 | */ | |
883 | return bt_skb_alloc(hdr_len + len, GFP_ATOMIC); | |
884 | } | |
885 | ||
886 | static void chan_suspend_cb(struct l2cap_chan *chan) | |
887 | { | |
888 | struct sk_buff *skb = chan->data; | |
889 | ||
890 | BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb); | |
891 | ||
892 | lowpan_cb(skb)->status = -EAGAIN; | |
893 | } | |
894 | ||
895 | static void chan_resume_cb(struct l2cap_chan *chan) | |
896 | { | |
897 | struct sk_buff *skb = chan->data; | |
898 | ||
899 | BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb); | |
900 | ||
901 | lowpan_cb(skb)->status = 0; | |
902 | } | |
903 | ||
904 | static long chan_get_sndtimeo_cb(struct l2cap_chan *chan) | |
905 | { | |
2ae50d8d | 906 | return L2CAP_CONN_TIMEOUT; |
6b8d4a6a JR |
907 | } |
908 | ||
909 | static const struct l2cap_ops bt_6lowpan_chan_ops = { | |
910 | .name = "L2CAP 6LoWPAN channel", | |
911 | .new_connection = chan_new_conn_cb, | |
912 | .recv = chan_recv_cb, | |
913 | .close = chan_close_cb, | |
914 | .state_change = chan_state_change_cb, | |
915 | .ready = chan_ready_cb, | |
916 | .resume = chan_resume_cb, | |
917 | .suspend = chan_suspend_cb, | |
918 | .get_sndtimeo = chan_get_sndtimeo_cb, | |
919 | .alloc_skb = chan_alloc_skb_cb, | |
920 | .memcpy_fromiovec = l2cap_chan_no_memcpy_fromiovec, | |
921 | ||
922 | .teardown = l2cap_chan_no_teardown, | |
923 | .defer = l2cap_chan_no_defer, | |
924 | .set_shutdown = l2cap_chan_no_set_shutdown, | |
925 | }; | |
926 | ||
927 | static inline __u8 bdaddr_type(__u8 type) | |
928 | { | |
929 | if (type == ADDR_LE_DEV_PUBLIC) | |
930 | return BDADDR_LE_PUBLIC; | |
931 | else | |
932 | return BDADDR_LE_RANDOM; | |
933 | } | |
934 | ||
935 | static struct l2cap_chan *chan_get(void) | |
936 | { | |
937 | struct l2cap_chan *pchan; | |
938 | ||
939 | pchan = chan_create(); | |
940 | if (!pchan) | |
941 | return NULL; | |
942 | ||
943 | pchan->ops = &bt_6lowpan_chan_ops; | |
944 | ||
945 | return pchan; | |
946 | } | |
947 | ||
948 | static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type) | |
949 | { | |
950 | struct l2cap_chan *pchan; | |
951 | int err; | |
952 | ||
953 | pchan = chan_get(); | |
954 | if (!pchan) | |
955 | return -EINVAL; | |
956 | ||
957 | err = l2cap_chan_connect(pchan, cpu_to_le16(psm_6lowpan), 0, | |
958 | addr, dst_type); | |
959 | ||
960 | BT_DBG("chan %p err %d", pchan, err); | |
961 | if (err < 0) | |
962 | l2cap_chan_put(pchan); | |
963 | ||
18722c24 JR |
964 | return err; |
965 | } | |
966 | ||
6b8d4a6a JR |
967 | static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type) |
968 | { | |
969 | struct lowpan_peer *peer; | |
970 | ||
971 | BT_DBG("conn %p dst type %d", conn, dst_type); | |
972 | ||
973 | peer = lookup_peer(conn); | |
974 | if (!peer) | |
975 | return -ENOENT; | |
976 | ||
977 | BT_DBG("peer %p chan %p", peer, peer->chan); | |
978 | ||
979 | l2cap_chan_close(peer->chan, ENOENT); | |
980 | ||
981 | return 0; | |
982 | } | |
983 | ||
984 | static struct l2cap_chan *bt_6lowpan_listen(void) | |
985 | { | |
986 | bdaddr_t *addr = BDADDR_ANY; | |
987 | struct l2cap_chan *pchan; | |
988 | int err; | |
989 | ||
990 | if (psm_6lowpan == 0) | |
991 | return NULL; | |
992 | ||
993 | pchan = chan_get(); | |
994 | if (!pchan) | |
995 | return NULL; | |
996 | ||
997 | pchan->state = BT_LISTEN; | |
998 | pchan->src_type = BDADDR_LE_PUBLIC; | |
999 | ||
1000 | BT_DBG("psm 0x%04x chan %p src type %d", psm_6lowpan, pchan, | |
1001 | pchan->src_type); | |
1002 | ||
1003 | err = l2cap_add_psm(pchan, addr, cpu_to_le16(psm_6lowpan)); | |
1004 | if (err) { | |
1005 | l2cap_chan_put(pchan); | |
1006 | BT_ERR("psm cannot be added err %d", err); | |
1007 | return NULL; | |
1008 | } | |
1009 | ||
1010 | return pchan; | |
1011 | } | |
1012 | ||
1013 | static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type, | |
1014 | struct l2cap_conn **conn) | |
1015 | { | |
1016 | struct hci_conn *hcon; | |
1017 | struct hci_dev *hdev; | |
1018 | bdaddr_t *src = BDADDR_ANY; | |
1019 | int n; | |
1020 | ||
1021 | n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu", | |
1022 | &addr->b[5], &addr->b[4], &addr->b[3], | |
1023 | &addr->b[2], &addr->b[1], &addr->b[0], | |
1024 | addr_type); | |
1025 | ||
1026 | if (n < 7) | |
1027 | return -EINVAL; | |
1028 | ||
1029 | hdev = hci_get_route(addr, src); | |
1030 | if (!hdev) | |
1031 | return -ENOENT; | |
1032 | ||
1033 | hci_dev_lock(hdev); | |
1034 | hcon = hci_conn_hash_lookup_ba(hdev, LE_LINK, addr); | |
1035 | hci_dev_unlock(hdev); | |
1036 | ||
1037 | if (!hcon) | |
1038 | return -ENOENT; | |
1039 | ||
1040 | *conn = (struct l2cap_conn *)hcon->l2cap_data; | |
1041 | ||
1042 | BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type); | |
1043 | ||
1044 | return 0; | |
1045 | } | |
1046 | ||
1047 | static void disconnect_all_peers(void) | |
1048 | { | |
1049 | struct lowpan_dev *entry, *tmp_dev; | |
1050 | struct lowpan_peer *peer, *tmp_peer, *new_peer; | |
1051 | struct list_head peers; | |
1052 | unsigned long flags; | |
1053 | ||
1054 | INIT_LIST_HEAD(&peers); | |
1055 | ||
1056 | /* We make a separate list of peers as the close_cb() will | |
1057 | * modify the device peers list so it is better not to mess | |
1058 | * with the same list at the same time. | |
1059 | */ | |
1060 | ||
1061 | read_lock_irqsave(&devices_lock, flags); | |
1062 | ||
1063 | list_for_each_entry_safe(entry, tmp_dev, &bt_6lowpan_devices, list) { | |
1064 | list_for_each_entry_safe(peer, tmp_peer, &entry->peers, list) { | |
1065 | new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC); | |
1066 | if (!new_peer) | |
1067 | break; | |
1068 | ||
1069 | new_peer->chan = peer->chan; | |
1070 | INIT_LIST_HEAD(&new_peer->list); | |
1071 | ||
1072 | list_add(&new_peer->list, &peers); | |
1073 | } | |
1074 | } | |
1075 | ||
1076 | read_unlock_irqrestore(&devices_lock, flags); | |
1077 | ||
1078 | list_for_each_entry_safe(peer, tmp_peer, &peers, list) { | |
1079 | l2cap_chan_close(peer->chan, ENOENT); | |
1080 | kfree(peer); | |
1081 | } | |
1082 | } | |
1083 | ||
1084 | static int lowpan_psm_set(void *data, u64 val) | |
1085 | { | |
1086 | u16 psm; | |
1087 | ||
1088 | psm = val; | |
1089 | if (psm == 0 || psm_6lowpan != psm) | |
1090 | /* Disconnect existing connections if 6lowpan is | |
1091 | * disabled (psm = 0), or if psm changes. | |
1092 | */ | |
1093 | disconnect_all_peers(); | |
1094 | ||
1095 | psm_6lowpan = psm; | |
1096 | ||
1097 | if (listen_chan) { | |
1098 | l2cap_chan_close(listen_chan, 0); | |
1099 | l2cap_chan_put(listen_chan); | |
1100 | } | |
1101 | ||
1102 | listen_chan = bt_6lowpan_listen(); | |
1103 | ||
1104 | return 0; | |
1105 | } | |
1106 | ||
1107 | static int lowpan_psm_get(void *data, u64 *val) | |
1108 | { | |
1109 | *val = psm_6lowpan; | |
1110 | return 0; | |
1111 | } | |
1112 | ||
1113 | DEFINE_SIMPLE_ATTRIBUTE(lowpan_psm_fops, lowpan_psm_get, | |
1114 | lowpan_psm_set, "%llu\n"); | |
1115 | ||
1116 | static ssize_t lowpan_control_write(struct file *fp, | |
1117 | const char __user *user_buffer, | |
1118 | size_t count, | |
1119 | loff_t *position) | |
1120 | { | |
1121 | char buf[32]; | |
1122 | size_t buf_size = min(count, sizeof(buf) - 1); | |
1123 | int ret; | |
1124 | bdaddr_t addr; | |
1125 | u8 addr_type; | |
1126 | struct l2cap_conn *conn = NULL; | |
1127 | ||
1128 | if (copy_from_user(buf, user_buffer, buf_size)) | |
1129 | return -EFAULT; | |
1130 | ||
1131 | buf[buf_size] = '\0'; | |
1132 | ||
1133 | if (memcmp(buf, "connect ", 8) == 0) { | |
1134 | ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn); | |
1135 | if (ret == -EINVAL) | |
1136 | return ret; | |
1137 | ||
1138 | if (listen_chan) { | |
1139 | l2cap_chan_close(listen_chan, 0); | |
1140 | l2cap_chan_put(listen_chan); | |
1141 | listen_chan = NULL; | |
1142 | } | |
1143 | ||
1144 | if (conn) { | |
1145 | struct lowpan_peer *peer; | |
1146 | ||
1147 | if (!is_bt_6lowpan(conn->hcon)) | |
1148 | return -EINVAL; | |
1149 | ||
1150 | peer = lookup_peer(conn); | |
1151 | if (peer) { | |
1152 | BT_DBG("6LoWPAN connection already exists"); | |
1153 | return -EALREADY; | |
1154 | } | |
1155 | ||
1156 | BT_DBG("conn %p dst %pMR type %d user %d", conn, | |
1157 | &conn->hcon->dst, conn->hcon->dst_type, | |
1158 | addr_type); | |
1159 | } | |
1160 | ||
1161 | ret = bt_6lowpan_connect(&addr, addr_type); | |
1162 | if (ret < 0) | |
1163 | return ret; | |
1164 | ||
1165 | return count; | |
1166 | } | |
1167 | ||
1168 | if (memcmp(buf, "disconnect ", 11) == 0) { | |
1169 | ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn); | |
1170 | if (ret < 0) | |
1171 | return ret; | |
1172 | ||
1173 | ret = bt_6lowpan_disconnect(conn, addr_type); | |
1174 | if (ret < 0) | |
1175 | return ret; | |
1176 | ||
1177 | return count; | |
1178 | } | |
1179 | ||
1180 | return count; | |
1181 | } | |
1182 | ||
1183 | static int lowpan_control_show(struct seq_file *f, void *ptr) | |
1184 | { | |
1185 | struct lowpan_dev *entry, *tmp_dev; | |
1186 | struct lowpan_peer *peer, *tmp_peer; | |
1187 | unsigned long flags; | |
1188 | ||
1189 | read_lock_irqsave(&devices_lock, flags); | |
1190 | ||
1191 | list_for_each_entry_safe(entry, tmp_dev, &bt_6lowpan_devices, list) { | |
1192 | list_for_each_entry_safe(peer, tmp_peer, &entry->peers, list) | |
1193 | seq_printf(f, "%pMR (type %u)\n", | |
1194 | &peer->chan->dst, peer->chan->dst_type); | |
1195 | } | |
1196 | ||
1197 | read_unlock_irqrestore(&devices_lock, flags); | |
1198 | ||
1199 | return 0; | |
1200 | } | |
1201 | ||
1202 | static int lowpan_control_open(struct inode *inode, struct file *file) | |
1203 | { | |
1204 | return single_open(file, lowpan_control_show, inode->i_private); | |
1205 | } | |
1206 | ||
1207 | static const struct file_operations lowpan_control_fops = { | |
1208 | .open = lowpan_control_open, | |
1209 | .read = seq_read, | |
1210 | .write = lowpan_control_write, | |
1211 | .llseek = seq_lseek, | |
1212 | .release = single_release, | |
1213 | }; | |
1214 | ||
7f118253 JR |
1215 | static void disconnect_devices(void) |
1216 | { | |
1217 | struct lowpan_dev *entry, *tmp, *new_dev; | |
1218 | struct list_head devices; | |
1219 | unsigned long flags; | |
1220 | ||
1221 | INIT_LIST_HEAD(&devices); | |
1222 | ||
1223 | /* We make a separate list of devices because the unregister_netdev() | |
1224 | * will call device_event() which will also want to modify the same | |
1225 | * devices list. | |
1226 | */ | |
1227 | ||
1228 | read_lock_irqsave(&devices_lock, flags); | |
1229 | ||
1230 | list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) { | |
1231 | new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC); | |
1232 | if (!new_dev) | |
1233 | break; | |
1234 | ||
1235 | new_dev->netdev = entry->netdev; | |
1236 | INIT_LIST_HEAD(&new_dev->list); | |
1237 | ||
1238 | list_add(&new_dev->list, &devices); | |
1239 | } | |
1240 | ||
1241 | read_unlock_irqrestore(&devices_lock, flags); | |
1242 | ||
1243 | list_for_each_entry_safe(entry, tmp, &devices, list) { | |
1244 | ifdown(entry->netdev); | |
1245 | BT_DBG("Unregistering netdev %s %p", | |
1246 | entry->netdev->name, entry->netdev); | |
1247 | unregister_netdev(entry->netdev); | |
1248 | kfree(entry); | |
1249 | } | |
1250 | } | |
1251 | ||
18722c24 JR |
1252 | static int device_event(struct notifier_block *unused, |
1253 | unsigned long event, void *ptr) | |
1254 | { | |
1255 | struct net_device *netdev = netdev_notifier_info_to_dev(ptr); | |
1256 | struct lowpan_dev *entry, *tmp; | |
1257 | unsigned long flags; | |
1258 | ||
1259 | if (netdev->type != ARPHRD_6LOWPAN) | |
1260 | return NOTIFY_DONE; | |
1261 | ||
1262 | switch (event) { | |
1263 | case NETDEV_UNREGISTER: | |
1264 | write_lock_irqsave(&devices_lock, flags); | |
1265 | list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, | |
1266 | list) { | |
1267 | if (entry->netdev == netdev) { | |
7f118253 JR |
1268 | BT_DBG("Unregistered netdev %s %p", |
1269 | netdev->name, netdev); | |
18722c24 JR |
1270 | list_del(&entry->list); |
1271 | kfree(entry); | |
1272 | break; | |
1273 | } | |
1274 | } | |
1275 | write_unlock_irqrestore(&devices_lock, flags); | |
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 | ||
5547e48c | 1286 | static int __init bt_6lowpan_init(void) |
18722c24 | 1287 | { |
6b8d4a6a JR |
1288 | lowpan_psm_debugfs = debugfs_create_file("6lowpan_psm", 0644, |
1289 | bt_debugfs, NULL, | |
1290 | &lowpan_psm_fops); | |
1291 | lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644, | |
1292 | bt_debugfs, NULL, | |
1293 | &lowpan_control_fops); | |
1294 | ||
18722c24 JR |
1295 | return register_netdevice_notifier(&bt_6lowpan_dev_notifier); |
1296 | } | |
1297 | ||
5547e48c | 1298 | static void __exit bt_6lowpan_exit(void) |
18722c24 | 1299 | { |
6b8d4a6a JR |
1300 | debugfs_remove(lowpan_psm_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 | ||
7f118253 JR |
1308 | disconnect_devices(); |
1309 | ||
18722c24 JR |
1310 | unregister_netdevice_notifier(&bt_6lowpan_dev_notifier); |
1311 | } | |
5547e48c JR |
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"); |