]>
Commit | Line | Data |
---|---|---|
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> | |
814f1b24 | 23 | #include <net/pkt_sched.h> |
18722c24 | 24 | |
18722c24 JR |
25 | #include <net/bluetooth/bluetooth.h> |
26 | #include <net/bluetooth/hci_core.h> | |
27 | #include <net/bluetooth/l2cap.h> | |
28 | ||
cefc8c8a | 29 | #include <net/6lowpan.h> /* for the compression support */ |
18722c24 | 30 | |
6b8d4a6a JR |
31 | #define VERSION "0.1" |
32 | ||
7b2ed60e | 33 | static struct dentry *lowpan_enable_debugfs; |
6b8d4a6a JR |
34 | static struct dentry *lowpan_control_debugfs; |
35 | ||
18722c24 | 36 | #define IFACE_NAME_TEMPLATE "bt%d" |
18722c24 JR |
37 | |
38 | struct skb_cb { | |
39 | struct in6_addr addr; | |
39e90c77 | 40 | struct in6_addr gw; |
6b8d4a6a | 41 | struct l2cap_chan *chan; |
18722c24 JR |
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); | |
90305829 | 53 | static DEFINE_SPINLOCK(devices_lock); |
18722c24 | 54 | |
7b2ed60e | 55 | static bool enable_6lowpan; |
6b8d4a6a JR |
56 | |
57 | /* We are listening incoming connections via this channel | |
58 | */ | |
59 | static struct l2cap_chan *listen_chan; | |
60 | ||
18722c24 JR |
61 | struct lowpan_peer { |
62 | struct list_head list; | |
90305829 | 63 | struct rcu_head rcu; |
6b8d4a6a | 64 | struct l2cap_chan *chan; |
18722c24 JR |
65 | |
66 | /* peer addresses in various formats */ | |
fa09ae66 | 67 | unsigned char lladdr[ETH_ALEN]; |
18722c24 JR |
68 | struct in6_addr peer_addr; |
69 | }; | |
70 | ||
2e4d60cb | 71 | struct lowpan_btle_dev { |
18722c24 JR |
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 | ||
2e4d60cb AA |
83 | static inline struct lowpan_btle_dev * |
84 | lowpan_btle_dev(const struct net_device *netdev) | |
18722c24 | 85 | { |
2e4d60cb | 86 | return (struct lowpan_btle_dev *)lowpan_dev(netdev)->priv; |
18722c24 JR |
87 | } |
88 | ||
2e4d60cb AA |
89 | static inline void peer_add(struct lowpan_btle_dev *dev, |
90 | struct lowpan_peer *peer) | |
18722c24 | 91 | { |
90305829 | 92 | list_add_rcu(&peer->list, &dev->peers); |
18722c24 JR |
93 | atomic_inc(&dev->peer_count); |
94 | } | |
95 | ||
2e4d60cb AA |
96 | static inline bool peer_del(struct lowpan_btle_dev *dev, |
97 | struct lowpan_peer *peer) | |
18722c24 | 98 | { |
90305829 | 99 | list_del_rcu(&peer->list); |
4e790226 | 100 | kfree_rcu(peer, rcu); |
18722c24 | 101 | |
18d93c17 JR |
102 | module_put(THIS_MODULE); |
103 | ||
18722c24 JR |
104 | if (atomic_dec_and_test(&dev->peer_count)) { |
105 | BT_DBG("last peer"); | |
106 | return true; | |
107 | } | |
108 | ||
109 | return false; | |
110 | } | |
111 | ||
2e4d60cb | 112 | static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_btle_dev *dev, |
18722c24 JR |
113 | bdaddr_t *ba, __u8 type) |
114 | { | |
90305829 | 115 | struct lowpan_peer *peer; |
18722c24 JR |
116 | |
117 | BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count), | |
118 | ba, type); | |
119 | ||
90305829 JR |
120 | rcu_read_lock(); |
121 | ||
122 | list_for_each_entry_rcu(peer, &dev->peers, list) { | |
6b8d4a6a JR |
123 | BT_DBG("dst addr %pMR dst type %d", |
124 | &peer->chan->dst, peer->chan->dst_type); | |
18722c24 | 125 | |
6b8d4a6a | 126 | if (bacmp(&peer->chan->dst, ba)) |
18722c24 JR |
127 | continue; |
128 | ||
90305829 JR |
129 | if (type == peer->chan->dst_type) { |
130 | rcu_read_unlock(); | |
6b8d4a6a | 131 | return peer; |
90305829 | 132 | } |
6b8d4a6a JR |
133 | } |
134 | ||
90305829 JR |
135 | rcu_read_unlock(); |
136 | ||
6b8d4a6a JR |
137 | return NULL; |
138 | } | |
139 | ||
2e4d60cb AA |
140 | static inline struct lowpan_peer * |
141 | __peer_lookup_chan(struct lowpan_btle_dev *dev, struct l2cap_chan *chan) | |
6b8d4a6a | 142 | { |
90305829 | 143 | struct lowpan_peer *peer; |
6b8d4a6a | 144 | |
90305829 | 145 | list_for_each_entry_rcu(peer, &dev->peers, list) { |
6b8d4a6a | 146 | if (peer->chan == chan) |
18722c24 JR |
147 | return peer; |
148 | } | |
149 | ||
150 | return NULL; | |
151 | } | |
152 | ||
2e4d60cb AA |
153 | static inline struct lowpan_peer * |
154 | __peer_lookup_conn(struct lowpan_btle_dev *dev, struct l2cap_conn *conn) | |
18722c24 | 155 | { |
90305829 | 156 | struct lowpan_peer *peer; |
18722c24 | 157 | |
90305829 | 158 | list_for_each_entry_rcu(peer, &dev->peers, list) { |
6b8d4a6a | 159 | if (peer->chan->conn == conn) |
18722c24 JR |
160 | return peer; |
161 | } | |
162 | ||
163 | return NULL; | |
164 | } | |
165 | ||
2e4d60cb | 166 | static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_btle_dev *dev, |
39e90c77 JR |
167 | struct in6_addr *daddr, |
168 | struct sk_buff *skb) | |
169 | { | |
39e90c77 JR |
170 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
171 | int count = atomic_read(&dev->peer_count); | |
fdfc428e ND |
172 | const struct in6_addr *nexthop; |
173 | struct lowpan_peer *peer; | |
39e90c77 JR |
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 | */ | |
90305829 JR |
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 | } | |
39e90c77 JR |
188 | |
189 | if (!rt) { | |
0ef0bde7 JM |
190 | if (ipv6_addr_any(&lowpan_cb(skb)->gw)) { |
191 | /* There is neither route nor gateway, | |
192 | * probably the destination is a direct peer. | |
193 | */ | |
194 | nexthop = daddr; | |
195 | } else { | |
196 | /* There is a known gateway | |
197 | */ | |
198 | nexthop = &lowpan_cb(skb)->gw; | |
199 | } | |
39e90c77 | 200 | } else { |
2647a9b0 | 201 | nexthop = rt6_nexthop(rt, daddr); |
39e90c77 JR |
202 | |
203 | /* We need to remember the address because it is needed | |
204 | * by bt_xmit() when sending the packet. In bt_xmit(), the | |
205 | * destination routing info is not set. | |
206 | */ | |
207 | memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr)); | |
208 | } | |
209 | ||
210 | BT_DBG("gw %pI6c", nexthop); | |
211 | ||
90305829 JR |
212 | rcu_read_lock(); |
213 | ||
214 | list_for_each_entry_rcu(peer, &dev->peers, list) { | |
39e90c77 JR |
215 | BT_DBG("dst addr %pMR dst type %d ip %pI6c", |
216 | &peer->chan->dst, peer->chan->dst_type, | |
217 | &peer->peer_addr); | |
218 | ||
90305829 JR |
219 | if (!ipv6_addr_cmp(&peer->peer_addr, nexthop)) { |
220 | rcu_read_unlock(); | |
39e90c77 | 221 | return peer; |
90305829 | 222 | } |
39e90c77 JR |
223 | } |
224 | ||
90305829 JR |
225 | rcu_read_unlock(); |
226 | ||
39e90c77 JR |
227 | return NULL; |
228 | } | |
229 | ||
18722c24 JR |
230 | static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn) |
231 | { | |
2e4d60cb | 232 | struct lowpan_btle_dev *entry; |
18722c24 | 233 | struct lowpan_peer *peer = NULL; |
18722c24 | 234 | |
90305829 | 235 | rcu_read_lock(); |
18722c24 | 236 | |
90305829 JR |
237 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
238 | peer = __peer_lookup_conn(entry, conn); | |
18722c24 JR |
239 | if (peer) |
240 | break; | |
241 | } | |
242 | ||
90305829 | 243 | rcu_read_unlock(); |
18722c24 JR |
244 | |
245 | return peer; | |
246 | } | |
247 | ||
2e4d60cb | 248 | static struct lowpan_btle_dev *lookup_dev(struct l2cap_conn *conn) |
18722c24 | 249 | { |
2e4d60cb AA |
250 | struct lowpan_btle_dev *entry; |
251 | struct lowpan_btle_dev *dev = NULL; | |
18722c24 | 252 | |
90305829 | 253 | rcu_read_lock(); |
18722c24 | 254 | |
90305829 | 255 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
18722c24 JR |
256 | if (conn->hcon->hdev == entry->hdev) { |
257 | dev = entry; | |
258 | break; | |
259 | } | |
260 | } | |
261 | ||
90305829 | 262 | rcu_read_unlock(); |
18722c24 JR |
263 | |
264 | return dev; | |
265 | } | |
266 | ||
18722c24 JR |
267 | static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev) |
268 | { | |
269 | struct sk_buff *skb_cp; | |
18722c24 JR |
270 | |
271 | skb_cp = skb_copy(skb, GFP_ATOMIC); | |
272 | if (!skb_cp) | |
f8b36176 | 273 | return NET_RX_DROP; |
18722c24 | 274 | |
324e786e | 275 | return netif_rx_ni(skb_cp); |
18722c24 JR |
276 | } |
277 | ||
01141234 | 278 | static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev, |
27ce68a3 | 279 | struct lowpan_peer *peer) |
18722c24 | 280 | { |
c259d141 | 281 | const u8 *saddr; |
18722c24 | 282 | |
fa09ae66 | 283 | saddr = peer->lladdr; |
18722c24 | 284 | |
fa09ae66 | 285 | return lowpan_header_decompress(skb, netdev, netdev->dev_addr, saddr); |
18722c24 JR |
286 | } |
287 | ||
288 | static int recv_pkt(struct sk_buff *skb, struct net_device *dev, | |
27ce68a3 | 289 | struct lowpan_peer *peer) |
18722c24 JR |
290 | { |
291 | struct sk_buff *local_skb; | |
292 | int ret; | |
293 | ||
294 | if (!netif_running(dev)) | |
295 | goto drop; | |
296 | ||
cefdb801 | 297 | if (dev->type != ARPHRD_6LOWPAN || !skb->len) |
18722c24 JR |
298 | goto drop; |
299 | ||
cefdb801 AA |
300 | skb_reset_network_header(skb); |
301 | ||
11e3ff70 MT |
302 | skb = skb_share_check(skb, GFP_ATOMIC); |
303 | if (!skb) | |
304 | goto drop; | |
305 | ||
18722c24 | 306 | /* check that it's our buffer */ |
cefdb801 | 307 | if (lowpan_is_ipv6(*skb_network_header(skb))) { |
87f5fedb LD |
308 | /* Pull off the 1-byte of 6lowpan header. */ |
309 | skb_pull(skb, 1); | |
310 | ||
18722c24 JR |
311 | /* Copy the packet so that the IPv6 header is |
312 | * properly aligned. | |
313 | */ | |
314 | local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1, | |
315 | skb_tailroom(skb), GFP_ATOMIC); | |
316 | if (!local_skb) | |
317 | goto drop; | |
318 | ||
319 | local_skb->protocol = htons(ETH_P_IPV6); | |
320 | local_skb->pkt_type = PACKET_HOST; | |
4c58f328 | 321 | local_skb->dev = dev; |
18722c24 | 322 | |
18722c24 JR |
323 | skb_set_transport_header(local_skb, sizeof(struct ipv6hdr)); |
324 | ||
325 | if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) { | |
326 | kfree_skb(local_skb); | |
327 | goto drop; | |
328 | } | |
329 | ||
330 | dev->stats.rx_bytes += skb->len; | |
331 | dev->stats.rx_packets++; | |
332 | ||
3c400b84 MT |
333 | consume_skb(local_skb); |
334 | consume_skb(skb); | |
cefdb801 AA |
335 | } else if (lowpan_is_iphc(*skb_network_header(skb))) { |
336 | local_skb = skb_clone(skb, GFP_ATOMIC); | |
337 | if (!local_skb) | |
338 | goto drop; | |
339 | ||
4c58f328 GRB |
340 | local_skb->dev = dev; |
341 | ||
27ce68a3 | 342 | ret = iphc_decompress(local_skb, dev, peer); |
cefdb801 | 343 | if (ret < 0) { |
da75fdc6 | 344 | BT_DBG("iphc_decompress failed: %d", ret); |
cefdb801 AA |
345 | kfree_skb(local_skb); |
346 | goto drop; | |
347 | } | |
348 | ||
349 | local_skb->protocol = htons(ETH_P_IPV6); | |
350 | local_skb->pkt_type = PACKET_HOST; | |
cefdb801 AA |
351 | |
352 | if (give_skb_to_upper(local_skb, dev) | |
353 | != NET_RX_SUCCESS) { | |
354 | kfree_skb(local_skb); | |
355 | goto drop; | |
18722c24 | 356 | } |
cefdb801 AA |
357 | |
358 | dev->stats.rx_bytes += skb->len; | |
359 | dev->stats.rx_packets++; | |
360 | ||
361 | consume_skb(local_skb); | |
362 | consume_skb(skb); | |
363 | } else { | |
da75fdc6 | 364 | BT_DBG("unknown packet type"); |
cefdb801 | 365 | goto drop; |
18722c24 JR |
366 | } |
367 | ||
368 | return NET_RX_SUCCESS; | |
369 | ||
370 | drop: | |
6b8d4a6a | 371 | dev->stats.rx_dropped++; |
18722c24 JR |
372 | return NET_RX_DROP; |
373 | } | |
374 | ||
375 | /* Packet from BT LE device */ | |
6b8d4a6a | 376 | static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
18722c24 | 377 | { |
2e4d60cb | 378 | struct lowpan_btle_dev *dev; |
18722c24 JR |
379 | struct lowpan_peer *peer; |
380 | int err; | |
381 | ||
6b8d4a6a | 382 | peer = lookup_peer(chan->conn); |
18722c24 JR |
383 | if (!peer) |
384 | return -ENOENT; | |
385 | ||
6b8d4a6a | 386 | dev = lookup_dev(chan->conn); |
30d3db44 | 387 | if (!dev || !dev->netdev) |
18722c24 JR |
388 | return -ENOENT; |
389 | ||
27ce68a3 | 390 | err = recv_pkt(skb, dev->netdev, peer); |
6b8d4a6a JR |
391 | if (err) { |
392 | BT_DBG("recv pkt %d", err); | |
393 | err = -EAGAIN; | |
18722c24 JR |
394 | } |
395 | ||
6b8d4a6a | 396 | return err; |
18722c24 JR |
397 | } |
398 | ||
36b3dd25 JR |
399 | static int setup_header(struct sk_buff *skb, struct net_device *netdev, |
400 | bdaddr_t *peer_addr, u8 *peer_addr_type) | |
18722c24 | 401 | { |
36b3dd25 | 402 | struct in6_addr ipv6_daddr; |
55441070 | 403 | struct ipv6hdr *hdr; |
2e4d60cb | 404 | struct lowpan_btle_dev *dev; |
18722c24 | 405 | struct lowpan_peer *peer; |
9dae2e03 | 406 | u8 *daddr; |
36b3dd25 | 407 | int err, status = 0; |
18722c24 | 408 | |
55441070 GRB |
409 | hdr = ipv6_hdr(skb); |
410 | ||
2e4d60cb | 411 | dev = lowpan_btle_dev(netdev); |
18722c24 | 412 | |
55441070 | 413 | memcpy(&ipv6_daddr, &hdr->daddr, sizeof(ipv6_daddr)); |
36b3dd25 JR |
414 | |
415 | if (ipv6_addr_is_multicast(&ipv6_daddr)) { | |
6b8d4a6a | 416 | lowpan_cb(skb)->chan = NULL; |
9dae2e03 | 417 | daddr = NULL; |
18722c24 | 418 | } else { |
9dae2e03 | 419 | BT_DBG("dest IP %pI6c", &ipv6_daddr); |
18722c24 | 420 | |
9dae2e03 LAD |
421 | /* The packet might be sent to 6lowpan interface |
422 | * because of routing (either via default route | |
423 | * or user set route) so get peer according to | |
424 | * the destination address. | |
18722c24 | 425 | */ |
9dae2e03 | 426 | peer = peer_lookup_dst(dev, &ipv6_daddr, skb); |
18722c24 | 427 | if (!peer) { |
9dae2e03 LAD |
428 | BT_DBG("no such peer"); |
429 | return -ENOENT; | |
18722c24 JR |
430 | } |
431 | ||
fa09ae66 | 432 | daddr = peer->lladdr; |
fa0eaf84 | 433 | *peer_addr = peer->chan->dst; |
9dae2e03 | 434 | *peer_addr_type = peer->chan->dst_type; |
6b8d4a6a | 435 | lowpan_cb(skb)->chan = peer->chan; |
36b3dd25 JR |
436 | |
437 | status = 1; | |
18722c24 JR |
438 | } |
439 | ||
a6f77389 | 440 | lowpan_header_compress(skb, netdev, daddr, dev->netdev->dev_addr); |
36b3dd25 JR |
441 | |
442 | err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0); | |
443 | if (err < 0) | |
444 | return err; | |
445 | ||
446 | return status; | |
447 | } | |
448 | ||
449 | static int header_create(struct sk_buff *skb, struct net_device *netdev, | |
450 | unsigned short type, const void *_daddr, | |
451 | const void *_saddr, unsigned int len) | |
452 | { | |
36b3dd25 JR |
453 | if (type != ETH_P_IPV6) |
454 | return -EINVAL; | |
455 | ||
36b3dd25 | 456 | return 0; |
18722c24 JR |
457 | } |
458 | ||
459 | /* Packet to BT LE device */ | |
6b8d4a6a | 460 | static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb, |
d7b6b0a5 | 461 | struct net_device *netdev) |
18722c24 | 462 | { |
6b8d4a6a JR |
463 | struct msghdr msg; |
464 | struct kvec iv; | |
465 | int err; | |
466 | ||
467 | /* Remember the skb so that we can send EAGAIN to the caller if | |
d7b6b0a5 | 468 | * we run out of credits. |
6b8d4a6a | 469 | */ |
d7b6b0a5 | 470 | chan->data = skb; |
6b8d4a6a | 471 | |
6b8d4a6a JR |
472 | iv.iov_base = skb->data; |
473 | iv.iov_len = skb->len; | |
474 | ||
c0371da6 | 475 | memset(&msg, 0, sizeof(msg)); |
17836394 | 476 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, &iv, 1, skb->len); |
c0371da6 | 477 | |
6b8d4a6a JR |
478 | err = l2cap_chan_send(chan, &msg, skb->len); |
479 | if (err > 0) { | |
480 | netdev->stats.tx_bytes += err; | |
481 | netdev->stats.tx_packets++; | |
482 | return 0; | |
483 | } | |
484 | ||
e1008f95 LAD |
485 | if (err < 0) |
486 | netdev->stats.tx_errors++; | |
18722c24 | 487 | |
6b8d4a6a | 488 | return err; |
18722c24 JR |
489 | } |
490 | ||
9c238ca8 | 491 | static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev) |
18722c24 JR |
492 | { |
493 | struct sk_buff *local_skb; | |
2e4d60cb | 494 | struct lowpan_btle_dev *entry; |
9c238ca8 | 495 | int err = 0; |
18722c24 | 496 | |
90305829 | 497 | rcu_read_lock(); |
18722c24 | 498 | |
90305829 JR |
499 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
500 | struct lowpan_peer *pentry; | |
2e4d60cb | 501 | struct lowpan_btle_dev *dev; |
18722c24 JR |
502 | |
503 | if (entry->netdev != netdev) | |
504 | continue; | |
505 | ||
2e4d60cb | 506 | dev = lowpan_btle_dev(entry->netdev); |
18722c24 | 507 | |
90305829 | 508 | list_for_each_entry_rcu(pentry, &dev->peers, list) { |
9c238ca8 JR |
509 | int ret; |
510 | ||
18722c24 JR |
511 | local_skb = skb_clone(skb, GFP_ATOMIC); |
512 | ||
36b3dd25 JR |
513 | BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p", |
514 | netdev->name, | |
515 | &pentry->chan->dst, pentry->chan->dst_type, | |
516 | &pentry->peer_addr, pentry->chan); | |
9c238ca8 JR |
517 | ret = send_pkt(pentry->chan, local_skb, netdev); |
518 | if (ret < 0) | |
519 | err = ret; | |
18722c24 JR |
520 | |
521 | kfree_skb(local_skb); | |
522 | } | |
523 | } | |
524 | ||
90305829 | 525 | rcu_read_unlock(); |
9c238ca8 JR |
526 | |
527 | return err; | |
18722c24 JR |
528 | } |
529 | ||
530 | static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev) | |
531 | { | |
532 | int err = 0; | |
18722c24 JR |
533 | bdaddr_t addr; |
534 | u8 addr_type; | |
535 | ||
36b3dd25 JR |
536 | /* We must take a copy of the skb before we modify/replace the ipv6 |
537 | * header as the header could be used elsewhere | |
538 | */ | |
b0c42cd7 AA |
539 | skb = skb_unshare(skb, GFP_ATOMIC); |
540 | if (!skb) | |
36b3dd25 JR |
541 | return NET_XMIT_DROP; |
542 | ||
543 | /* Return values from setup_header() | |
544 | * <0 - error, packet is dropped | |
545 | * 0 - this is a multicast packet | |
546 | * 1 - this is unicast packet | |
547 | */ | |
548 | err = setup_header(skb, netdev, &addr, &addr_type); | |
549 | if (err < 0) { | |
550 | kfree_skb(skb); | |
551 | return NET_XMIT_DROP; | |
552 | } | |
18722c24 | 553 | |
36b3dd25 JR |
554 | if (err) { |
555 | if (lowpan_cb(skb)->chan) { | |
556 | BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p", | |
557 | netdev->name, &addr, addr_type, | |
558 | &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan); | |
d7b6b0a5 | 559 | err = send_pkt(lowpan_cb(skb)->chan, skb, netdev); |
36b3dd25 | 560 | } else { |
6b8d4a6a | 561 | err = -ENOENT; |
36b3dd25 JR |
562 | } |
563 | } else { | |
564 | /* We need to send the packet to every device behind this | |
565 | * interface. | |
566 | */ | |
9c238ca8 | 567 | err = send_mcast_pkt(skb, netdev); |
18722c24 | 568 | } |
18722c24 | 569 | |
fc12518a JR |
570 | dev_kfree_skb(skb); |
571 | ||
18722c24 JR |
572 | if (err) |
573 | BT_DBG("ERROR: xmit failed (%d)", err); | |
574 | ||
36b3dd25 | 575 | return err < 0 ? NET_XMIT_DROP : err; |
18722c24 JR |
576 | } |
577 | ||
df092306 JR |
578 | static int bt_dev_init(struct net_device *dev) |
579 | { | |
d3fff6c4 | 580 | netdev_lockdep_set_classes(dev); |
df092306 JR |
581 | |
582 | return 0; | |
583 | } | |
584 | ||
18722c24 | 585 | static const struct net_device_ops netdev_ops = { |
df092306 | 586 | .ndo_init = bt_dev_init, |
18722c24 JR |
587 | .ndo_start_xmit = bt_xmit, |
588 | }; | |
589 | ||
590 | static struct header_ops header_ops = { | |
591 | .create = header_create, | |
592 | }; | |
593 | ||
594 | static void netdev_setup(struct net_device *dev) | |
595 | { | |
18722c24 JR |
596 | dev->hard_header_len = 0; |
597 | dev->needed_tailroom = 0; | |
25869522 | 598 | dev->flags = IFF_RUNNING | IFF_MULTICAST; |
18722c24 | 599 | dev->watchdog_timeo = 0; |
814f1b24 | 600 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; |
18722c24 JR |
601 | |
602 | dev->netdev_ops = &netdev_ops; | |
603 | dev->header_ops = &header_ops; | |
cf124db5 | 604 | dev->needs_free_netdev = true; |
18722c24 JR |
605 | } |
606 | ||
607 | static struct device_type bt_type = { | |
608 | .name = "bluetooth", | |
609 | }; | |
610 | ||
18722c24 JR |
611 | static void ifup(struct net_device *netdev) |
612 | { | |
613 | int err; | |
614 | ||
615 | rtnl_lock(); | |
616 | err = dev_open(netdev); | |
617 | if (err < 0) | |
618 | BT_INFO("iface %s cannot be opened (%d)", netdev->name, err); | |
619 | rtnl_unlock(); | |
620 | } | |
621 | ||
7f118253 JR |
622 | static void ifdown(struct net_device *netdev) |
623 | { | |
7f118253 | 624 | rtnl_lock(); |
ddee3103 | 625 | dev_close(netdev); |
7f118253 JR |
626 | rtnl_unlock(); |
627 | } | |
628 | ||
18722c24 JR |
629 | static void do_notify_peers(struct work_struct *work) |
630 | { | |
2e4d60cb AA |
631 | struct lowpan_btle_dev *dev = container_of(work, struct lowpan_btle_dev, |
632 | notify_peers.work); | |
18722c24 JR |
633 | |
634 | netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */ | |
635 | } | |
636 | ||
637 | static bool is_bt_6lowpan(struct hci_conn *hcon) | |
638 | { | |
639 | if (hcon->type != LE_LINK) | |
640 | return false; | |
641 | ||
7b2ed60e | 642 | if (!enable_6lowpan) |
6b8d4a6a JR |
643 | return false; |
644 | ||
645 | return true; | |
18722c24 JR |
646 | } |
647 | ||
6b8d4a6a JR |
648 | static struct l2cap_chan *chan_create(void) |
649 | { | |
650 | struct l2cap_chan *chan; | |
651 | ||
652 | chan = l2cap_chan_create(); | |
653 | if (!chan) | |
654 | return NULL; | |
655 | ||
656 | l2cap_chan_set_defaults(chan); | |
657 | ||
658 | chan->chan_type = L2CAP_CHAN_CONN_ORIENTED; | |
659 | chan->mode = L2CAP_MODE_LE_FLOWCTL; | |
301de2cb | 660 | chan->imtu = 1280; |
6b8d4a6a JR |
661 | |
662 | return chan; | |
663 | } | |
664 | ||
6b8d4a6a | 665 | static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan, |
d2891c4d MS |
666 | struct lowpan_btle_dev *dev, |
667 | bool new_netdev) | |
18722c24 JR |
668 | { |
669 | struct lowpan_peer *peer; | |
18722c24 JR |
670 | |
671 | peer = kzalloc(sizeof(*peer), GFP_ATOMIC); | |
672 | if (!peer) | |
6b8d4a6a | 673 | return NULL; |
18722c24 | 674 | |
6b8d4a6a | 675 | peer->chan = chan; |
18722c24 JR |
676 | memset(&peer->peer_addr, 0, sizeof(struct in6_addr)); |
677 | ||
fa09ae66 | 678 | baswap((void *)peer->lladdr, &chan->dst); |
18722c24 | 679 | |
fa09ae66 | 680 | lowpan_iphc_uncompress_eui48_lladdr(&peer->peer_addr, peer->lladdr); |
18722c24 | 681 | |
90305829 | 682 | spin_lock(&devices_lock); |
18722c24 JR |
683 | INIT_LIST_HEAD(&peer->list); |
684 | peer_add(dev, peer); | |
90305829 | 685 | spin_unlock(&devices_lock); |
18722c24 JR |
686 | |
687 | /* Notifying peers about us needs to be done without locks held */ | |
d2891c4d MS |
688 | if (new_netdev) |
689 | INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers); | |
18722c24 JR |
690 | schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100)); |
691 | ||
6b8d4a6a | 692 | return peer->chan; |
18722c24 JR |
693 | } |
694 | ||
2e4d60cb | 695 | static int setup_netdev(struct l2cap_chan *chan, struct lowpan_btle_dev **dev) |
18722c24 | 696 | { |
18722c24 JR |
697 | struct net_device *netdev; |
698 | int err = 0; | |
18722c24 | 699 | |
2e4d60cb | 700 | netdev = alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_btle_dev)), |
b72f6f51 AA |
701 | IFACE_NAME_TEMPLATE, NET_NAME_UNKNOWN, |
702 | netdev_setup); | |
18722c24 JR |
703 | if (!netdev) |
704 | return -ENOMEM; | |
705 | ||
c259d141 PF |
706 | netdev->addr_assign_type = NET_ADDR_PERM; |
707 | baswap((void *)netdev->dev_addr, &chan->src); | |
18722c24 JR |
708 | |
709 | netdev->netdev_ops = &netdev_ops; | |
fc84242f | 710 | SET_NETDEV_DEV(netdev, &chan->conn->hcon->hdev->dev); |
18722c24 JR |
711 | SET_NETDEV_DEVTYPE(netdev, &bt_type); |
712 | ||
2e4d60cb | 713 | *dev = lowpan_btle_dev(netdev); |
5857d1db AA |
714 | (*dev)->netdev = netdev; |
715 | (*dev)->hdev = chan->conn->hcon->hdev; | |
716 | INIT_LIST_HEAD(&(*dev)->peers); | |
717 | ||
718 | spin_lock(&devices_lock); | |
719 | INIT_LIST_HEAD(&(*dev)->list); | |
720 | list_add_rcu(&(*dev)->list, &bt_6lowpan_devices); | |
721 | spin_unlock(&devices_lock); | |
722 | ||
00f59314 | 723 | err = lowpan_register_netdev(netdev, LOWPAN_LLTYPE_BTLE); |
18722c24 JR |
724 | if (err < 0) { |
725 | BT_INFO("register_netdev failed %d", err); | |
5857d1db AA |
726 | spin_lock(&devices_lock); |
727 | list_del_rcu(&(*dev)->list); | |
728 | spin_unlock(&devices_lock); | |
18722c24 JR |
729 | free_netdev(netdev); |
730 | goto out; | |
731 | } | |
732 | ||
6b8d4a6a JR |
733 | BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d", |
734 | netdev->ifindex, &chan->dst, chan->dst_type, | |
735 | &chan->src, chan->src_type); | |
18722c24 JR |
736 | set_bit(__LINK_STATE_PRESENT, &netdev->state); |
737 | ||
6b8d4a6a | 738 | return 0; |
18722c24 JR |
739 | |
740 | out: | |
741 | return err; | |
742 | } | |
743 | ||
6b8d4a6a JR |
744 | static inline void chan_ready_cb(struct l2cap_chan *chan) |
745 | { | |
2e4d60cb | 746 | struct lowpan_btle_dev *dev; |
d2891c4d | 747 | bool new_netdev = false; |
6b8d4a6a JR |
748 | |
749 | dev = lookup_dev(chan->conn); | |
750 | ||
751 | BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev); | |
752 | ||
753 | if (!dev) { | |
754 | if (setup_netdev(chan, &dev) < 0) { | |
755 | l2cap_chan_del(chan, -ENOENT); | |
756 | return; | |
757 | } | |
d2891c4d | 758 | new_netdev = true; |
6b8d4a6a JR |
759 | } |
760 | ||
18d93c17 JR |
761 | if (!try_module_get(THIS_MODULE)) |
762 | return; | |
763 | ||
d2891c4d | 764 | add_peer_chan(chan, dev, new_netdev); |
6b8d4a6a JR |
765 | ifup(dev->netdev); |
766 | } | |
767 | ||
2b293490 | 768 | static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan) |
6b8d4a6a | 769 | { |
2b293490 | 770 | struct l2cap_chan *chan; |
6b8d4a6a | 771 | |
630ef791 JH |
772 | chan = chan_create(); |
773 | if (!chan) | |
774 | return NULL; | |
775 | ||
2b293490 | 776 | chan->ops = pchan->ops; |
6b8d4a6a JR |
777 | |
778 | BT_DBG("chan %p pchan %p", chan, pchan); | |
779 | ||
2b293490 | 780 | return chan; |
6b8d4a6a JR |
781 | } |
782 | ||
18722c24 JR |
783 | static void delete_netdev(struct work_struct *work) |
784 | { | |
2e4d60cb AA |
785 | struct lowpan_btle_dev *entry = container_of(work, |
786 | struct lowpan_btle_dev, | |
787 | delete_netdev); | |
18722c24 | 788 | |
00f59314 | 789 | lowpan_unregister_netdev(entry->netdev); |
18722c24 | 790 | |
2ad88fb2 | 791 | /* The entry pointer is deleted by the netdev destructor. */ |
18722c24 JR |
792 | } |
793 | ||
6b8d4a6a | 794 | static void chan_close_cb(struct l2cap_chan *chan) |
18722c24 | 795 | { |
2e4d60cb AA |
796 | struct lowpan_btle_dev *entry; |
797 | struct lowpan_btle_dev *dev = NULL; | |
18722c24 JR |
798 | struct lowpan_peer *peer; |
799 | int err = -ENOENT; | |
f63666d2 | 800 | bool last = false, remove = true; |
18722c24 | 801 | |
6b8d4a6a JR |
802 | BT_DBG("chan %p conn %p", chan, chan->conn); |
803 | ||
804 | if (chan->conn && chan->conn->hcon) { | |
805 | if (!is_bt_6lowpan(chan->conn->hcon)) | |
806 | return; | |
807 | ||
808 | /* If conn is set, then the netdev is also there and we should | |
809 | * not remove it. | |
810 | */ | |
f63666d2 | 811 | remove = false; |
6b8d4a6a | 812 | } |
18722c24 | 813 | |
90305829 | 814 | spin_lock(&devices_lock); |
18722c24 | 815 | |
90305829 | 816 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
2e4d60cb | 817 | dev = lowpan_btle_dev(entry->netdev); |
90305829 | 818 | peer = __peer_lookup_chan(dev, chan); |
18722c24 JR |
819 | if (peer) { |
820 | last = peer_del(dev, peer); | |
821 | err = 0; | |
6b8d4a6a JR |
822 | |
823 | BT_DBG("dev %p removing %speer %p", dev, | |
824 | last ? "last " : "1 ", peer); | |
825 | BT_DBG("chan %p orig refcnt %d", chan, | |
2c935bc5 | 826 | kref_read(&chan->kref)); |
6b8d4a6a JR |
827 | |
828 | l2cap_chan_put(chan); | |
18722c24 JR |
829 | break; |
830 | } | |
831 | } | |
832 | ||
833 | if (!err && last && dev && !atomic_read(&dev->peer_count)) { | |
90305829 | 834 | spin_unlock(&devices_lock); |
18722c24 JR |
835 | |
836 | cancel_delayed_work_sync(&dev->notify_peers); | |
837 | ||
7f118253 JR |
838 | ifdown(dev->netdev); |
839 | ||
f63666d2 | 840 | if (remove) { |
6b8d4a6a JR |
841 | INIT_WORK(&entry->delete_netdev, delete_netdev); |
842 | schedule_work(&entry->delete_netdev); | |
843 | } | |
18722c24 | 844 | } else { |
90305829 | 845 | spin_unlock(&devices_lock); |
18722c24 JR |
846 | } |
847 | ||
6b8d4a6a JR |
848 | return; |
849 | } | |
850 | ||
851 | static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err) | |
852 | { | |
853 | BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn, | |
854 | state_to_string(state), err); | |
855 | } | |
856 | ||
857 | static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan, | |
858 | unsigned long hdr_len, | |
859 | unsigned long len, int nb) | |
860 | { | |
861 | /* Note that we must allocate using GFP_ATOMIC here as | |
862 | * this function is called originally from netdev hard xmit | |
863 | * function in atomic context. | |
864 | */ | |
865 | return bt_skb_alloc(hdr_len + len, GFP_ATOMIC); | |
866 | } | |
867 | ||
868 | static void chan_suspend_cb(struct l2cap_chan *chan) | |
869 | { | |
f183e52b LAD |
870 | struct lowpan_btle_dev *dev; |
871 | ||
6dea44f5 | 872 | BT_DBG("chan %p suspend", chan); |
f183e52b LAD |
873 | |
874 | dev = lookup_dev(chan->conn); | |
875 | if (!dev || !dev->netdev) | |
876 | return; | |
877 | ||
878 | netif_stop_queue(dev->netdev); | |
6b8d4a6a JR |
879 | } |
880 | ||
881 | static void chan_resume_cb(struct l2cap_chan *chan) | |
882 | { | |
f183e52b LAD |
883 | struct lowpan_btle_dev *dev; |
884 | ||
6dea44f5 | 885 | BT_DBG("chan %p resume", chan); |
f183e52b LAD |
886 | |
887 | dev = lookup_dev(chan->conn); | |
888 | if (!dev || !dev->netdev) | |
889 | return; | |
890 | ||
891 | netif_wake_queue(dev->netdev); | |
6b8d4a6a JR |
892 | } |
893 | ||
894 | static long chan_get_sndtimeo_cb(struct l2cap_chan *chan) | |
895 | { | |
2ae50d8d | 896 | return L2CAP_CONN_TIMEOUT; |
6b8d4a6a JR |
897 | } |
898 | ||
899 | static const struct l2cap_ops bt_6lowpan_chan_ops = { | |
900 | .name = "L2CAP 6LoWPAN channel", | |
901 | .new_connection = chan_new_conn_cb, | |
902 | .recv = chan_recv_cb, | |
903 | .close = chan_close_cb, | |
904 | .state_change = chan_state_change_cb, | |
905 | .ready = chan_ready_cb, | |
906 | .resume = chan_resume_cb, | |
907 | .suspend = chan_suspend_cb, | |
908 | .get_sndtimeo = chan_get_sndtimeo_cb, | |
909 | .alloc_skb = chan_alloc_skb_cb, | |
6b8d4a6a JR |
910 | |
911 | .teardown = l2cap_chan_no_teardown, | |
912 | .defer = l2cap_chan_no_defer, | |
913 | .set_shutdown = l2cap_chan_no_set_shutdown, | |
914 | }; | |
915 | ||
916 | static inline __u8 bdaddr_type(__u8 type) | |
917 | { | |
918 | if (type == ADDR_LE_DEV_PUBLIC) | |
919 | return BDADDR_LE_PUBLIC; | |
920 | else | |
921 | return BDADDR_LE_RANDOM; | |
922 | } | |
923 | ||
6b8d4a6a JR |
924 | static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type) |
925 | { | |
0cd088fc | 926 | struct l2cap_chan *chan; |
6b8d4a6a JR |
927 | int err; |
928 | ||
26d46dff | 929 | chan = chan_create(); |
0cd088fc | 930 | if (!chan) |
6b8d4a6a JR |
931 | return -EINVAL; |
932 | ||
26d46dff JH |
933 | chan->ops = &bt_6lowpan_chan_ops; |
934 | ||
0cd088fc | 935 | err = l2cap_chan_connect(chan, cpu_to_le16(L2CAP_PSM_IPSP), 0, |
6b8d4a6a JR |
936 | addr, dst_type); |
937 | ||
0cd088fc | 938 | BT_DBG("chan %p err %d", chan, err); |
6b8d4a6a | 939 | if (err < 0) |
0cd088fc | 940 | l2cap_chan_put(chan); |
6b8d4a6a | 941 | |
18722c24 JR |
942 | return err; |
943 | } | |
944 | ||
6b8d4a6a JR |
945 | static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type) |
946 | { | |
947 | struct lowpan_peer *peer; | |
948 | ||
949 | BT_DBG("conn %p dst type %d", conn, dst_type); | |
950 | ||
951 | peer = lookup_peer(conn); | |
952 | if (!peer) | |
953 | return -ENOENT; | |
954 | ||
955 | BT_DBG("peer %p chan %p", peer, peer->chan); | |
956 | ||
957 | l2cap_chan_close(peer->chan, ENOENT); | |
958 | ||
959 | return 0; | |
960 | } | |
961 | ||
962 | static struct l2cap_chan *bt_6lowpan_listen(void) | |
963 | { | |
964 | bdaddr_t *addr = BDADDR_ANY; | |
0cd088fc | 965 | struct l2cap_chan *chan; |
6b8d4a6a JR |
966 | int err; |
967 | ||
7b2ed60e | 968 | if (!enable_6lowpan) |
6b8d4a6a JR |
969 | return NULL; |
970 | ||
26d46dff | 971 | chan = chan_create(); |
0cd088fc | 972 | if (!chan) |
6b8d4a6a JR |
973 | return NULL; |
974 | ||
26d46dff | 975 | chan->ops = &bt_6lowpan_chan_ops; |
0cd088fc JH |
976 | chan->state = BT_LISTEN; |
977 | chan->src_type = BDADDR_LE_PUBLIC; | |
6b8d4a6a | 978 | |
0cd088fc | 979 | atomic_set(&chan->nesting, L2CAP_NESTING_PARENT); |
2773b024 | 980 | |
0cd088fc | 981 | BT_DBG("chan %p src type %d", chan, chan->src_type); |
6b8d4a6a | 982 | |
0cd088fc | 983 | err = l2cap_add_psm(chan, addr, cpu_to_le16(L2CAP_PSM_IPSP)); |
6b8d4a6a | 984 | if (err) { |
0cd088fc | 985 | l2cap_chan_put(chan); |
6b8d4a6a JR |
986 | BT_ERR("psm cannot be added err %d", err); |
987 | return NULL; | |
988 | } | |
989 | ||
0cd088fc | 990 | return chan; |
6b8d4a6a JR |
991 | } |
992 | ||
993 | static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type, | |
994 | struct l2cap_conn **conn) | |
995 | { | |
996 | struct hci_conn *hcon; | |
997 | struct hci_dev *hdev; | |
6b8d4a6a JR |
998 | int n; |
999 | ||
1000 | n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu", | |
1001 | &addr->b[5], &addr->b[4], &addr->b[3], | |
1002 | &addr->b[2], &addr->b[1], &addr->b[0], | |
1003 | addr_type); | |
1004 | ||
1005 | if (n < 7) | |
1006 | return -EINVAL; | |
1007 | ||
39385cb5 JH |
1008 | /* The LE_PUBLIC address type is ignored because of BDADDR_ANY */ |
1009 | hdev = hci_get_route(addr, BDADDR_ANY, BDADDR_LE_PUBLIC); | |
6b8d4a6a JR |
1010 | if (!hdev) |
1011 | return -ENOENT; | |
1012 | ||
1013 | hci_dev_lock(hdev); | |
f5ad4ffc | 1014 | hcon = hci_conn_hash_lookup_le(hdev, addr, *addr_type); |
6b8d4a6a JR |
1015 | hci_dev_unlock(hdev); |
1016 | ||
1017 | if (!hcon) | |
1018 | return -ENOENT; | |
1019 | ||
1020 | *conn = (struct l2cap_conn *)hcon->l2cap_data; | |
1021 | ||
1022 | BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type); | |
1023 | ||
1024 | return 0; | |
1025 | } | |
1026 | ||
1027 | static void disconnect_all_peers(void) | |
1028 | { | |
2e4d60cb | 1029 | struct lowpan_btle_dev *entry; |
6b8d4a6a JR |
1030 | struct lowpan_peer *peer, *tmp_peer, *new_peer; |
1031 | struct list_head peers; | |
6b8d4a6a JR |
1032 | |
1033 | INIT_LIST_HEAD(&peers); | |
1034 | ||
1035 | /* We make a separate list of peers as the close_cb() will | |
1036 | * modify the device peers list so it is better not to mess | |
1037 | * with the same list at the same time. | |
1038 | */ | |
1039 | ||
90305829 | 1040 | rcu_read_lock(); |
6b8d4a6a | 1041 | |
90305829 JR |
1042 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
1043 | list_for_each_entry_rcu(peer, &entry->peers, list) { | |
6b8d4a6a JR |
1044 | new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC); |
1045 | if (!new_peer) | |
1046 | break; | |
1047 | ||
1048 | new_peer->chan = peer->chan; | |
1049 | INIT_LIST_HEAD(&new_peer->list); | |
1050 | ||
1051 | list_add(&new_peer->list, &peers); | |
1052 | } | |
1053 | } | |
1054 | ||
90305829 | 1055 | rcu_read_unlock(); |
6b8d4a6a | 1056 | |
90305829 | 1057 | spin_lock(&devices_lock); |
6b8d4a6a JR |
1058 | list_for_each_entry_safe(peer, tmp_peer, &peers, list) { |
1059 | l2cap_chan_close(peer->chan, ENOENT); | |
90305829 JR |
1060 | |
1061 | list_del_rcu(&peer->list); | |
4e790226 | 1062 | kfree_rcu(peer, rcu); |
6b8d4a6a | 1063 | } |
90305829 | 1064 | spin_unlock(&devices_lock); |
6b8d4a6a JR |
1065 | } |
1066 | ||
7b2ed60e | 1067 | struct set_enable { |
90305829 | 1068 | struct work_struct work; |
7b2ed60e | 1069 | bool flag; |
90305829 | 1070 | }; |
6b8d4a6a | 1071 | |
7b2ed60e | 1072 | static void do_enable_set(struct work_struct *work) |
90305829 | 1073 | { |
7b2ed60e JR |
1074 | struct set_enable *set_enable = container_of(work, |
1075 | struct set_enable, work); | |
90305829 | 1076 | |
7b2ed60e | 1077 | if (!set_enable->flag || enable_6lowpan != set_enable->flag) |
6b8d4a6a | 1078 | /* Disconnect existing connections if 6lowpan is |
7b2ed60e | 1079 | * disabled |
6b8d4a6a JR |
1080 | */ |
1081 | disconnect_all_peers(); | |
1082 | ||
7b2ed60e | 1083 | enable_6lowpan = set_enable->flag; |
6b8d4a6a JR |
1084 | |
1085 | if (listen_chan) { | |
1086 | l2cap_chan_close(listen_chan, 0); | |
1087 | l2cap_chan_put(listen_chan); | |
1088 | } | |
1089 | ||
1090 | listen_chan = bt_6lowpan_listen(); | |
1091 | ||
7b2ed60e | 1092 | kfree(set_enable); |
90305829 JR |
1093 | } |
1094 | ||
7b2ed60e | 1095 | static int lowpan_enable_set(void *data, u64 val) |
90305829 | 1096 | { |
7b2ed60e | 1097 | struct set_enable *set_enable; |
90305829 | 1098 | |
7b2ed60e JR |
1099 | set_enable = kzalloc(sizeof(*set_enable), GFP_KERNEL); |
1100 | if (!set_enable) | |
90305829 JR |
1101 | return -ENOMEM; |
1102 | ||
7b2ed60e JR |
1103 | set_enable->flag = !!val; |
1104 | INIT_WORK(&set_enable->work, do_enable_set); | |
90305829 | 1105 | |
7b2ed60e | 1106 | schedule_work(&set_enable->work); |
90305829 | 1107 | |
6b8d4a6a JR |
1108 | return 0; |
1109 | } | |
1110 | ||
7b2ed60e | 1111 | static int lowpan_enable_get(void *data, u64 *val) |
6b8d4a6a | 1112 | { |
7b2ed60e | 1113 | *val = enable_6lowpan; |
6b8d4a6a JR |
1114 | return 0; |
1115 | } | |
1116 | ||
7b2ed60e JR |
1117 | DEFINE_SIMPLE_ATTRIBUTE(lowpan_enable_fops, lowpan_enable_get, |
1118 | lowpan_enable_set, "%llu\n"); | |
6b8d4a6a JR |
1119 | |
1120 | static ssize_t lowpan_control_write(struct file *fp, | |
1121 | const char __user *user_buffer, | |
1122 | size_t count, | |
1123 | loff_t *position) | |
1124 | { | |
1125 | char buf[32]; | |
1126 | size_t buf_size = min(count, sizeof(buf) - 1); | |
1127 | int ret; | |
1128 | bdaddr_t addr; | |
1129 | u8 addr_type; | |
1130 | struct l2cap_conn *conn = NULL; | |
1131 | ||
1132 | if (copy_from_user(buf, user_buffer, buf_size)) | |
1133 | return -EFAULT; | |
1134 | ||
1135 | buf[buf_size] = '\0'; | |
1136 | ||
1137 | if (memcmp(buf, "connect ", 8) == 0) { | |
1138 | ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn); | |
1139 | if (ret == -EINVAL) | |
1140 | return ret; | |
1141 | ||
1142 | if (listen_chan) { | |
1143 | l2cap_chan_close(listen_chan, 0); | |
1144 | l2cap_chan_put(listen_chan); | |
1145 | listen_chan = NULL; | |
1146 | } | |
1147 | ||
1148 | if (conn) { | |
1149 | struct lowpan_peer *peer; | |
1150 | ||
1151 | if (!is_bt_6lowpan(conn->hcon)) | |
1152 | return -EINVAL; | |
1153 | ||
1154 | peer = lookup_peer(conn); | |
1155 | if (peer) { | |
1156 | BT_DBG("6LoWPAN connection already exists"); | |
1157 | return -EALREADY; | |
1158 | } | |
1159 | ||
1160 | BT_DBG("conn %p dst %pMR type %d user %d", conn, | |
1161 | &conn->hcon->dst, conn->hcon->dst_type, | |
1162 | addr_type); | |
1163 | } | |
1164 | ||
1165 | ret = bt_6lowpan_connect(&addr, addr_type); | |
1166 | if (ret < 0) | |
1167 | return ret; | |
1168 | ||
1169 | return count; | |
1170 | } | |
1171 | ||
1172 | if (memcmp(buf, "disconnect ", 11) == 0) { | |
1173 | ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn); | |
1174 | if (ret < 0) | |
1175 | return ret; | |
1176 | ||
1177 | ret = bt_6lowpan_disconnect(conn, addr_type); | |
1178 | if (ret < 0) | |
1179 | return ret; | |
1180 | ||
1181 | return count; | |
1182 | } | |
1183 | ||
1184 | return count; | |
1185 | } | |
1186 | ||
1187 | static int lowpan_control_show(struct seq_file *f, void *ptr) | |
1188 | { | |
2e4d60cb | 1189 | struct lowpan_btle_dev *entry; |
90305829 | 1190 | struct lowpan_peer *peer; |
6b8d4a6a | 1191 | |
90305829 | 1192 | spin_lock(&devices_lock); |
6b8d4a6a | 1193 | |
90305829 JR |
1194 | list_for_each_entry(entry, &bt_6lowpan_devices, list) { |
1195 | list_for_each_entry(peer, &entry->peers, list) | |
6b8d4a6a JR |
1196 | seq_printf(f, "%pMR (type %u)\n", |
1197 | &peer->chan->dst, peer->chan->dst_type); | |
1198 | } | |
1199 | ||
90305829 | 1200 | spin_unlock(&devices_lock); |
6b8d4a6a JR |
1201 | |
1202 | return 0; | |
1203 | } | |
1204 | ||
1205 | static int lowpan_control_open(struct inode *inode, struct file *file) | |
1206 | { | |
1207 | return single_open(file, lowpan_control_show, inode->i_private); | |
1208 | } | |
1209 | ||
1210 | static const struct file_operations lowpan_control_fops = { | |
1211 | .open = lowpan_control_open, | |
1212 | .read = seq_read, | |
1213 | .write = lowpan_control_write, | |
1214 | .llseek = seq_lseek, | |
1215 | .release = single_release, | |
1216 | }; | |
1217 | ||
7f118253 JR |
1218 | static void disconnect_devices(void) |
1219 | { | |
2e4d60cb | 1220 | struct lowpan_btle_dev *entry, *tmp, *new_dev; |
7f118253 | 1221 | struct list_head devices; |
7f118253 JR |
1222 | |
1223 | INIT_LIST_HEAD(&devices); | |
1224 | ||
1225 | /* We make a separate list of devices because the unregister_netdev() | |
1226 | * will call device_event() which will also want to modify the same | |
1227 | * devices list. | |
1228 | */ | |
1229 | ||
90305829 | 1230 | rcu_read_lock(); |
7f118253 | 1231 | |
90305829 | 1232 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
7f118253 JR |
1233 | new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC); |
1234 | if (!new_dev) | |
1235 | break; | |
1236 | ||
1237 | new_dev->netdev = entry->netdev; | |
1238 | INIT_LIST_HEAD(&new_dev->list); | |
1239 | ||
90305829 | 1240 | list_add_rcu(&new_dev->list, &devices); |
7f118253 JR |
1241 | } |
1242 | ||
90305829 | 1243 | rcu_read_unlock(); |
7f118253 | 1244 | |
daac197c | 1245 | list_for_each_entry_safe(entry, tmp, &devices, list) { |
7f118253 JR |
1246 | ifdown(entry->netdev); |
1247 | BT_DBG("Unregistering netdev %s %p", | |
1248 | entry->netdev->name, entry->netdev); | |
00f59314 | 1249 | lowpan_unregister_netdev(entry->netdev); |
7f118253 JR |
1250 | kfree(entry); |
1251 | } | |
1252 | } | |
1253 | ||
18722c24 JR |
1254 | static int device_event(struct notifier_block *unused, |
1255 | unsigned long event, void *ptr) | |
1256 | { | |
1257 | struct net_device *netdev = netdev_notifier_info_to_dev(ptr); | |
2e4d60cb | 1258 | struct lowpan_btle_dev *entry; |
18722c24 JR |
1259 | |
1260 | if (netdev->type != ARPHRD_6LOWPAN) | |
1261 | return NOTIFY_DONE; | |
1262 | ||
1263 | switch (event) { | |
1264 | case NETDEV_UNREGISTER: | |
90305829 JR |
1265 | spin_lock(&devices_lock); |
1266 | list_for_each_entry(entry, &bt_6lowpan_devices, list) { | |
18722c24 | 1267 | if (entry->netdev == netdev) { |
7f118253 JR |
1268 | BT_DBG("Unregistered netdev %s %p", |
1269 | netdev->name, netdev); | |
18722c24 | 1270 | list_del(&entry->list); |
18722c24 JR |
1271 | break; |
1272 | } | |
1273 | } | |
90305829 | 1274 | spin_unlock(&devices_lock); |
18722c24 JR |
1275 | break; |
1276 | } | |
1277 | ||
1278 | return NOTIFY_DONE; | |
1279 | } | |
1280 | ||
1281 | static struct notifier_block bt_6lowpan_dev_notifier = { | |
1282 | .notifier_call = device_event, | |
1283 | }; | |
1284 | ||
5547e48c | 1285 | static int __init bt_6lowpan_init(void) |
18722c24 | 1286 | { |
7b2ed60e JR |
1287 | lowpan_enable_debugfs = debugfs_create_file("6lowpan_enable", 0644, |
1288 | bt_debugfs, NULL, | |
1289 | &lowpan_enable_fops); | |
6b8d4a6a JR |
1290 | lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644, |
1291 | bt_debugfs, NULL, | |
1292 | &lowpan_control_fops); | |
1293 | ||
18722c24 JR |
1294 | return register_netdevice_notifier(&bt_6lowpan_dev_notifier); |
1295 | } | |
1296 | ||
5547e48c | 1297 | static void __exit bt_6lowpan_exit(void) |
18722c24 | 1298 | { |
7b2ed60e | 1299 | debugfs_remove(lowpan_enable_debugfs); |
6b8d4a6a JR |
1300 | debugfs_remove(lowpan_control_debugfs); |
1301 | ||
1302 | if (listen_chan) { | |
1303 | l2cap_chan_close(listen_chan, 0); | |
1304 | l2cap_chan_put(listen_chan); | |
1305 | } | |
1306 | ||
7f118253 JR |
1307 | disconnect_devices(); |
1308 | ||
18722c24 JR |
1309 | unregister_netdevice_notifier(&bt_6lowpan_dev_notifier); |
1310 | } | |
5547e48c JR |
1311 | |
1312 | module_init(bt_6lowpan_init); | |
1313 | module_exit(bt_6lowpan_exit); | |
1314 | ||
1315 | MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>"); | |
1316 | MODULE_DESCRIPTION("Bluetooth 6LoWPAN"); | |
1317 | MODULE_VERSION(VERSION); | |
1318 | MODULE_LICENSE("GPL"); |