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