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