Commit | Line | Data |
---|---|---|
97fb5e8d | 1 | // SPDX-License-Identifier: GPL-2.0-only |
18722c24 | 2 | /* |
6b8d4a6a | 3 | Copyright (c) 2013-2014 Intel Corp. |
18722c24 | 4 | |
18722c24 JR |
5 | */ |
6 | ||
18722c24 JR |
7 | #include <linux/if_arp.h> |
8 | #include <linux/netdevice.h> | |
9 | #include <linux/etherdevice.h> | |
5547e48c | 10 | #include <linux/module.h> |
6b8d4a6a | 11 | #include <linux/debugfs.h> |
18722c24 JR |
12 | |
13 | #include <net/ipv6.h> | |
14 | #include <net/ip6_route.h> | |
15 | #include <net/addrconf.h> | |
814f1b24 | 16 | #include <net/pkt_sched.h> |
18722c24 | 17 | |
18722c24 JR |
18 | #include <net/bluetooth/bluetooth.h> |
19 | #include <net/bluetooth/hci_core.h> | |
20 | #include <net/bluetooth/l2cap.h> | |
21 | ||
cefc8c8a | 22 | #include <net/6lowpan.h> /* for the compression support */ |
18722c24 | 23 | |
6b8d4a6a JR |
24 | #define VERSION "0.1" |
25 | ||
7b2ed60e | 26 | static struct dentry *lowpan_enable_debugfs; |
6b8d4a6a JR |
27 | static struct dentry *lowpan_control_debugfs; |
28 | ||
18722c24 | 29 | #define IFACE_NAME_TEMPLATE "bt%d" |
18722c24 JR |
30 | |
31 | struct skb_cb { | |
32 | struct in6_addr addr; | |
39e90c77 | 33 | struct in6_addr gw; |
6b8d4a6a | 34 | struct l2cap_chan *chan; |
18722c24 JR |
35 | }; |
36 | #define lowpan_cb(skb) ((struct skb_cb *)((skb)->cb)) | |
37 | ||
38 | /* The devices list contains those devices that we are acting | |
39 | * as a proxy. The BT 6LoWPAN device is a virtual device that | |
40 | * connects to the Bluetooth LE device. The real connection to | |
41 | * BT device is done via l2cap layer. There exists one | |
42 | * virtual device / one BT 6LoWPAN network (=hciX device). | |
43 | * The list contains struct lowpan_dev elements. | |
44 | */ | |
45 | static LIST_HEAD(bt_6lowpan_devices); | |
90305829 | 46 | static DEFINE_SPINLOCK(devices_lock); |
18722c24 | 47 | |
7b2ed60e | 48 | static bool enable_6lowpan; |
6b8d4a6a JR |
49 | |
50 | /* We are listening incoming connections via this channel | |
51 | */ | |
52 | static struct l2cap_chan *listen_chan; | |
f9c70bdc | 53 | static DEFINE_MUTEX(set_lock); |
6b8d4a6a | 54 | |
18722c24 JR |
55 | struct lowpan_peer { |
56 | struct list_head list; | |
90305829 | 57 | struct rcu_head rcu; |
6b8d4a6a | 58 | struct l2cap_chan *chan; |
18722c24 JR |
59 | |
60 | /* peer addresses in various formats */ | |
fa09ae66 | 61 | unsigned char lladdr[ETH_ALEN]; |
18722c24 JR |
62 | struct in6_addr peer_addr; |
63 | }; | |
64 | ||
2e4d60cb | 65 | struct lowpan_btle_dev { |
18722c24 JR |
66 | struct list_head list; |
67 | ||
68 | struct hci_dev *hdev; | |
69 | struct net_device *netdev; | |
70 | struct list_head peers; | |
71 | atomic_t peer_count; /* number of items in peers list */ | |
72 | ||
73 | struct work_struct delete_netdev; | |
74 | struct delayed_work notify_peers; | |
75 | }; | |
76 | ||
2e4d60cb AA |
77 | static inline struct lowpan_btle_dev * |
78 | lowpan_btle_dev(const struct net_device *netdev) | |
18722c24 | 79 | { |
2e4d60cb | 80 | return (struct lowpan_btle_dev *)lowpan_dev(netdev)->priv; |
18722c24 JR |
81 | } |
82 | ||
2e4d60cb AA |
83 | static inline void peer_add(struct lowpan_btle_dev *dev, |
84 | struct lowpan_peer *peer) | |
18722c24 | 85 | { |
90305829 | 86 | list_add_rcu(&peer->list, &dev->peers); |
18722c24 JR |
87 | atomic_inc(&dev->peer_count); |
88 | } | |
89 | ||
2e4d60cb AA |
90 | static inline bool peer_del(struct lowpan_btle_dev *dev, |
91 | struct lowpan_peer *peer) | |
18722c24 | 92 | { |
90305829 | 93 | list_del_rcu(&peer->list); |
4e790226 | 94 | kfree_rcu(peer, rcu); |
18722c24 | 95 | |
18d93c17 JR |
96 | module_put(THIS_MODULE); |
97 | ||
18722c24 JR |
98 | if (atomic_dec_and_test(&dev->peer_count)) { |
99 | BT_DBG("last peer"); | |
100 | return true; | |
101 | } | |
102 | ||
103 | return false; | |
104 | } | |
105 | ||
2e4d60cb AA |
106 | static inline struct lowpan_peer * |
107 | __peer_lookup_chan(struct lowpan_btle_dev *dev, struct l2cap_chan *chan) | |
6b8d4a6a | 108 | { |
90305829 | 109 | struct lowpan_peer *peer; |
6b8d4a6a | 110 | |
90305829 | 111 | list_for_each_entry_rcu(peer, &dev->peers, list) { |
6b8d4a6a | 112 | if (peer->chan == chan) |
18722c24 JR |
113 | return peer; |
114 | } | |
115 | ||
116 | return NULL; | |
117 | } | |
118 | ||
2e4d60cb AA |
119 | static inline struct lowpan_peer * |
120 | __peer_lookup_conn(struct lowpan_btle_dev *dev, struct l2cap_conn *conn) | |
18722c24 | 121 | { |
90305829 | 122 | struct lowpan_peer *peer; |
18722c24 | 123 | |
90305829 | 124 | list_for_each_entry_rcu(peer, &dev->peers, list) { |
6b8d4a6a | 125 | if (peer->chan->conn == conn) |
18722c24 JR |
126 | return peer; |
127 | } | |
128 | ||
129 | return NULL; | |
130 | } | |
131 | ||
2e4d60cb | 132 | static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_btle_dev *dev, |
39e90c77 JR |
133 | struct in6_addr *daddr, |
134 | struct sk_buff *skb) | |
135 | { | |
39e90c77 JR |
136 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
137 | int count = atomic_read(&dev->peer_count); | |
9b1c1ef1 ND |
138 | const struct in6_addr *nexthop; |
139 | struct lowpan_peer *peer; | |
5636376c | 140 | struct neighbour *neigh; |
39e90c77 JR |
141 | |
142 | BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt); | |
143 | ||
39e90c77 | 144 | if (!rt) { |
b188b032 JM |
145 | if (ipv6_addr_any(&lowpan_cb(skb)->gw)) { |
146 | /* There is neither route nor gateway, | |
147 | * probably the destination is a direct peer. | |
148 | */ | |
149 | nexthop = daddr; | |
150 | } else { | |
151 | /* There is a known gateway | |
152 | */ | |
153 | nexthop = &lowpan_cb(skb)->gw; | |
154 | } | |
39e90c77 | 155 | } else { |
2647a9b0 | 156 | nexthop = rt6_nexthop(rt, daddr); |
39e90c77 JR |
157 | |
158 | /* We need to remember the address because it is needed | |
159 | * by bt_xmit() when sending the packet. In bt_xmit(), the | |
160 | * destination routing info is not set. | |
161 | */ | |
162 | memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr)); | |
163 | } | |
164 | ||
165 | BT_DBG("gw %pI6c", nexthop); | |
166 | ||
90305829 JR |
167 | rcu_read_lock(); |
168 | ||
169 | list_for_each_entry_rcu(peer, &dev->peers, list) { | |
658d5d80 | 170 | BT_DBG("dst addr %pMR dst type %u ip %pI6c", |
39e90c77 JR |
171 | &peer->chan->dst, peer->chan->dst_type, |
172 | &peer->peer_addr); | |
173 | ||
90305829 JR |
174 | if (!ipv6_addr_cmp(&peer->peer_addr, nexthop)) { |
175 | rcu_read_unlock(); | |
39e90c77 | 176 | return peer; |
90305829 | 177 | } |
39e90c77 JR |
178 | } |
179 | ||
149b3f13 | 180 | /* use the neighbour cache for matching addresses assigned by SLAAC */ |
5636376c JM |
181 | neigh = __ipv6_neigh_lookup(dev->netdev, nexthop); |
182 | if (neigh) { | |
183 | list_for_each_entry_rcu(peer, &dev->peers, list) { | |
184 | if (!memcmp(neigh->ha, peer->lladdr, ETH_ALEN)) { | |
185 | neigh_release(neigh); | |
186 | rcu_read_unlock(); | |
187 | return peer; | |
188 | } | |
189 | } | |
190 | neigh_release(neigh); | |
191 | } | |
192 | ||
90305829 JR |
193 | rcu_read_unlock(); |
194 | ||
39e90c77 JR |
195 | return NULL; |
196 | } | |
197 | ||
18722c24 JR |
198 | static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn) |
199 | { | |
2e4d60cb | 200 | struct lowpan_btle_dev *entry; |
18722c24 | 201 | struct lowpan_peer *peer = NULL; |
18722c24 | 202 | |
90305829 | 203 | rcu_read_lock(); |
18722c24 | 204 | |
90305829 JR |
205 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
206 | peer = __peer_lookup_conn(entry, conn); | |
18722c24 JR |
207 | if (peer) |
208 | break; | |
209 | } | |
210 | ||
90305829 | 211 | rcu_read_unlock(); |
18722c24 JR |
212 | |
213 | return peer; | |
214 | } | |
215 | ||
2e4d60cb | 216 | static struct lowpan_btle_dev *lookup_dev(struct l2cap_conn *conn) |
18722c24 | 217 | { |
2e4d60cb AA |
218 | struct lowpan_btle_dev *entry; |
219 | struct lowpan_btle_dev *dev = NULL; | |
18722c24 | 220 | |
90305829 | 221 | rcu_read_lock(); |
18722c24 | 222 | |
90305829 | 223 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
18722c24 JR |
224 | if (conn->hcon->hdev == entry->hdev) { |
225 | dev = entry; | |
226 | break; | |
227 | } | |
228 | } | |
229 | ||
90305829 | 230 | rcu_read_unlock(); |
18722c24 JR |
231 | |
232 | return dev; | |
233 | } | |
234 | ||
18722c24 JR |
235 | static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev) |
236 | { | |
237 | struct sk_buff *skb_cp; | |
18722c24 JR |
238 | |
239 | skb_cp = skb_copy(skb, GFP_ATOMIC); | |
240 | if (!skb_cp) | |
f8b36176 | 241 | return NET_RX_DROP; |
18722c24 | 242 | |
d33d0dc9 | 243 | return netif_rx(skb_cp); |
18722c24 JR |
244 | } |
245 | ||
01141234 | 246 | static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev, |
27ce68a3 | 247 | struct lowpan_peer *peer) |
18722c24 | 248 | { |
c259d141 | 249 | const u8 *saddr; |
18722c24 | 250 | |
fa09ae66 | 251 | saddr = peer->lladdr; |
18722c24 | 252 | |
fa09ae66 | 253 | return lowpan_header_decompress(skb, netdev, netdev->dev_addr, saddr); |
18722c24 JR |
254 | } |
255 | ||
256 | static int recv_pkt(struct sk_buff *skb, struct net_device *dev, | |
27ce68a3 | 257 | struct lowpan_peer *peer) |
18722c24 JR |
258 | { |
259 | struct sk_buff *local_skb; | |
260 | int ret; | |
261 | ||
262 | if (!netif_running(dev)) | |
263 | goto drop; | |
264 | ||
cefdb801 | 265 | if (dev->type != ARPHRD_6LOWPAN || !skb->len) |
18722c24 JR |
266 | goto drop; |
267 | ||
cefdb801 AA |
268 | skb_reset_network_header(skb); |
269 | ||
11e3ff70 MT |
270 | skb = skb_share_check(skb, GFP_ATOMIC); |
271 | if (!skb) | |
272 | goto drop; | |
273 | ||
18722c24 | 274 | /* check that it's our buffer */ |
cefdb801 | 275 | if (lowpan_is_ipv6(*skb_network_header(skb))) { |
87f5fedb LD |
276 | /* Pull off the 1-byte of 6lowpan header. */ |
277 | skb_pull(skb, 1); | |
278 | ||
18722c24 JR |
279 | /* Copy the packet so that the IPv6 header is |
280 | * properly aligned. | |
281 | */ | |
282 | local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1, | |
283 | skb_tailroom(skb), GFP_ATOMIC); | |
284 | if (!local_skb) | |
285 | goto drop; | |
286 | ||
287 | local_skb->protocol = htons(ETH_P_IPV6); | |
288 | local_skb->pkt_type = PACKET_HOST; | |
4c58f328 | 289 | local_skb->dev = dev; |
18722c24 | 290 | |
18722c24 JR |
291 | skb_set_transport_header(local_skb, sizeof(struct ipv6hdr)); |
292 | ||
293 | if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) { | |
294 | kfree_skb(local_skb); | |
295 | goto drop; | |
296 | } | |
297 | ||
298 | dev->stats.rx_bytes += skb->len; | |
299 | dev->stats.rx_packets++; | |
300 | ||
3c400b84 MT |
301 | consume_skb(local_skb); |
302 | consume_skb(skb); | |
cefdb801 AA |
303 | } else if (lowpan_is_iphc(*skb_network_header(skb))) { |
304 | local_skb = skb_clone(skb, GFP_ATOMIC); | |
305 | if (!local_skb) | |
306 | goto drop; | |
307 | ||
4c58f328 GRB |
308 | local_skb->dev = dev; |
309 | ||
27ce68a3 | 310 | ret = iphc_decompress(local_skb, dev, peer); |
cefdb801 | 311 | if (ret < 0) { |
da75fdc6 | 312 | BT_DBG("iphc_decompress failed: %d", ret); |
cefdb801 AA |
313 | kfree_skb(local_skb); |
314 | goto drop; | |
315 | } | |
316 | ||
317 | local_skb->protocol = htons(ETH_P_IPV6); | |
318 | local_skb->pkt_type = PACKET_HOST; | |
cefdb801 AA |
319 | |
320 | if (give_skb_to_upper(local_skb, dev) | |
321 | != NET_RX_SUCCESS) { | |
322 | kfree_skb(local_skb); | |
323 | goto drop; | |
18722c24 | 324 | } |
cefdb801 AA |
325 | |
326 | dev->stats.rx_bytes += skb->len; | |
327 | dev->stats.rx_packets++; | |
328 | ||
329 | consume_skb(local_skb); | |
330 | consume_skb(skb); | |
331 | } else { | |
da75fdc6 | 332 | BT_DBG("unknown packet type"); |
cefdb801 | 333 | goto drop; |
18722c24 JR |
334 | } |
335 | ||
336 | return NET_RX_SUCCESS; | |
337 | ||
338 | drop: | |
6b8d4a6a | 339 | dev->stats.rx_dropped++; |
18722c24 JR |
340 | return NET_RX_DROP; |
341 | } | |
342 | ||
343 | /* Packet from BT LE device */ | |
6b8d4a6a | 344 | static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
18722c24 | 345 | { |
2e4d60cb | 346 | struct lowpan_btle_dev *dev; |
18722c24 JR |
347 | struct lowpan_peer *peer; |
348 | int err; | |
349 | ||
6b8d4a6a | 350 | peer = lookup_peer(chan->conn); |
18722c24 JR |
351 | if (!peer) |
352 | return -ENOENT; | |
353 | ||
6b8d4a6a | 354 | dev = lookup_dev(chan->conn); |
30d3db44 | 355 | if (!dev || !dev->netdev) |
18722c24 JR |
356 | return -ENOENT; |
357 | ||
27ce68a3 | 358 | err = recv_pkt(skb, dev->netdev, peer); |
6b8d4a6a JR |
359 | if (err) { |
360 | BT_DBG("recv pkt %d", err); | |
361 | err = -EAGAIN; | |
18722c24 JR |
362 | } |
363 | ||
6b8d4a6a | 364 | return err; |
18722c24 JR |
365 | } |
366 | ||
36b3dd25 JR |
367 | static int setup_header(struct sk_buff *skb, struct net_device *netdev, |
368 | bdaddr_t *peer_addr, u8 *peer_addr_type) | |
18722c24 | 369 | { |
36b3dd25 | 370 | struct in6_addr ipv6_daddr; |
55441070 | 371 | struct ipv6hdr *hdr; |
2e4d60cb | 372 | struct lowpan_btle_dev *dev; |
18722c24 | 373 | struct lowpan_peer *peer; |
9dae2e03 | 374 | u8 *daddr; |
36b3dd25 | 375 | int err, status = 0; |
18722c24 | 376 | |
55441070 GRB |
377 | hdr = ipv6_hdr(skb); |
378 | ||
2e4d60cb | 379 | dev = lowpan_btle_dev(netdev); |
18722c24 | 380 | |
55441070 | 381 | memcpy(&ipv6_daddr, &hdr->daddr, sizeof(ipv6_daddr)); |
36b3dd25 JR |
382 | |
383 | if (ipv6_addr_is_multicast(&ipv6_daddr)) { | |
6b8d4a6a | 384 | lowpan_cb(skb)->chan = NULL; |
9dae2e03 | 385 | daddr = NULL; |
18722c24 | 386 | } else { |
9dae2e03 | 387 | BT_DBG("dest IP %pI6c", &ipv6_daddr); |
18722c24 | 388 | |
9dae2e03 LAD |
389 | /* The packet might be sent to 6lowpan interface |
390 | * because of routing (either via default route | |
391 | * or user set route) so get peer according to | |
392 | * the destination address. | |
18722c24 | 393 | */ |
9dae2e03 | 394 | peer = peer_lookup_dst(dev, &ipv6_daddr, skb); |
18722c24 | 395 | if (!peer) { |
9dae2e03 LAD |
396 | BT_DBG("no such peer"); |
397 | return -ENOENT; | |
18722c24 JR |
398 | } |
399 | ||
fa09ae66 | 400 | daddr = peer->lladdr; |
fa0eaf84 | 401 | *peer_addr = peer->chan->dst; |
9dae2e03 | 402 | *peer_addr_type = peer->chan->dst_type; |
6b8d4a6a | 403 | lowpan_cb(skb)->chan = peer->chan; |
36b3dd25 JR |
404 | |
405 | status = 1; | |
18722c24 JR |
406 | } |
407 | ||
a6f77389 | 408 | lowpan_header_compress(skb, netdev, daddr, dev->netdev->dev_addr); |
36b3dd25 JR |
409 | |
410 | err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0); | |
411 | if (err < 0) | |
412 | return err; | |
413 | ||
414 | return status; | |
415 | } | |
416 | ||
417 | static int header_create(struct sk_buff *skb, struct net_device *netdev, | |
418 | unsigned short type, const void *_daddr, | |
419 | const void *_saddr, unsigned int len) | |
420 | { | |
36b3dd25 JR |
421 | if (type != ETH_P_IPV6) |
422 | return -EINVAL; | |
423 | ||
36b3dd25 | 424 | return 0; |
18722c24 JR |
425 | } |
426 | ||
427 | /* Packet to BT LE device */ | |
6b8d4a6a | 428 | static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb, |
d7b6b0a5 | 429 | struct net_device *netdev) |
18722c24 | 430 | { |
6b8d4a6a JR |
431 | struct msghdr msg; |
432 | struct kvec iv; | |
433 | int err; | |
434 | ||
435 | /* Remember the skb so that we can send EAGAIN to the caller if | |
d7b6b0a5 | 436 | * we run out of credits. |
6b8d4a6a | 437 | */ |
d7b6b0a5 | 438 | chan->data = skb; |
6b8d4a6a | 439 | |
6b8d4a6a JR |
440 | iv.iov_base = skb->data; |
441 | iv.iov_len = skb->len; | |
442 | ||
c0371da6 | 443 | memset(&msg, 0, sizeof(msg)); |
de4eda9d | 444 | iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, &iv, 1, skb->len); |
c0371da6 | 445 | |
6b8d4a6a JR |
446 | err = l2cap_chan_send(chan, &msg, skb->len); |
447 | if (err > 0) { | |
448 | netdev->stats.tx_bytes += err; | |
449 | netdev->stats.tx_packets++; | |
450 | return 0; | |
451 | } | |
452 | ||
e1008f95 LAD |
453 | if (err < 0) |
454 | netdev->stats.tx_errors++; | |
18722c24 | 455 | |
6b8d4a6a | 456 | return err; |
18722c24 JR |
457 | } |
458 | ||
9c238ca8 | 459 | static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev) |
18722c24 JR |
460 | { |
461 | struct sk_buff *local_skb; | |
2e4d60cb | 462 | struct lowpan_btle_dev *entry; |
9c238ca8 | 463 | int err = 0; |
18722c24 | 464 | |
90305829 | 465 | rcu_read_lock(); |
18722c24 | 466 | |
90305829 JR |
467 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
468 | struct lowpan_peer *pentry; | |
2e4d60cb | 469 | struct lowpan_btle_dev *dev; |
18722c24 JR |
470 | |
471 | if (entry->netdev != netdev) | |
472 | continue; | |
473 | ||
2e4d60cb | 474 | dev = lowpan_btle_dev(entry->netdev); |
18722c24 | 475 | |
90305829 | 476 | list_for_each_entry_rcu(pentry, &dev->peers, list) { |
9c238ca8 JR |
477 | int ret; |
478 | ||
18722c24 JR |
479 | local_skb = skb_clone(skb, GFP_ATOMIC); |
480 | ||
658d5d80 | 481 | BT_DBG("xmit %s to %pMR type %u IP %pI6c chan %p", |
36b3dd25 JR |
482 | netdev->name, |
483 | &pentry->chan->dst, pentry->chan->dst_type, | |
484 | &pentry->peer_addr, pentry->chan); | |
9c238ca8 JR |
485 | ret = send_pkt(pentry->chan, local_skb, netdev); |
486 | if (ret < 0) | |
487 | err = ret; | |
18722c24 JR |
488 | |
489 | kfree_skb(local_skb); | |
490 | } | |
491 | } | |
492 | ||
90305829 | 493 | rcu_read_unlock(); |
9c238ca8 JR |
494 | |
495 | return err; | |
18722c24 JR |
496 | } |
497 | ||
498 | static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev) | |
499 | { | |
500 | int err = 0; | |
18722c24 JR |
501 | bdaddr_t addr; |
502 | u8 addr_type; | |
503 | ||
36b3dd25 JR |
504 | /* We must take a copy of the skb before we modify/replace the ipv6 |
505 | * header as the header could be used elsewhere | |
506 | */ | |
b0c42cd7 AA |
507 | skb = skb_unshare(skb, GFP_ATOMIC); |
508 | if (!skb) | |
36b3dd25 JR |
509 | return NET_XMIT_DROP; |
510 | ||
511 | /* Return values from setup_header() | |
512 | * <0 - error, packet is dropped | |
513 | * 0 - this is a multicast packet | |
514 | * 1 - this is unicast packet | |
515 | */ | |
516 | err = setup_header(skb, netdev, &addr, &addr_type); | |
517 | if (err < 0) { | |
518 | kfree_skb(skb); | |
519 | return NET_XMIT_DROP; | |
520 | } | |
18722c24 | 521 | |
36b3dd25 JR |
522 | if (err) { |
523 | if (lowpan_cb(skb)->chan) { | |
658d5d80 | 524 | BT_DBG("xmit %s to %pMR type %u IP %pI6c chan %p", |
36b3dd25 JR |
525 | netdev->name, &addr, addr_type, |
526 | &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan); | |
d7b6b0a5 | 527 | err = send_pkt(lowpan_cb(skb)->chan, skb, netdev); |
36b3dd25 | 528 | } else { |
6b8d4a6a | 529 | err = -ENOENT; |
36b3dd25 JR |
530 | } |
531 | } else { | |
532 | /* We need to send the packet to every device behind this | |
533 | * interface. | |
534 | */ | |
9c238ca8 | 535 | err = send_mcast_pkt(skb, netdev); |
18722c24 | 536 | } |
18722c24 | 537 | |
fc12518a JR |
538 | dev_kfree_skb(skb); |
539 | ||
18722c24 JR |
540 | if (err) |
541 | BT_DBG("ERROR: xmit failed (%d)", err); | |
542 | ||
36b3dd25 | 543 | return err < 0 ? NET_XMIT_DROP : err; |
18722c24 JR |
544 | } |
545 | ||
1a33e10e CW |
546 | static int bt_dev_init(struct net_device *dev) |
547 | { | |
548 | netdev_lockdep_set_classes(dev); | |
549 | ||
550 | return 0; | |
551 | } | |
552 | ||
18722c24 | 553 | static const struct net_device_ops netdev_ops = { |
1a33e10e | 554 | .ndo_init = bt_dev_init, |
18722c24 JR |
555 | .ndo_start_xmit = bt_xmit, |
556 | }; | |
557 | ||
569428da | 558 | static const struct header_ops header_ops = { |
18722c24 JR |
559 | .create = header_create, |
560 | }; | |
561 | ||
562 | static void netdev_setup(struct net_device *dev) | |
563 | { | |
18722c24 JR |
564 | dev->hard_header_len = 0; |
565 | dev->needed_tailroom = 0; | |
25869522 | 566 | dev->flags = IFF_RUNNING | IFF_MULTICAST; |
18722c24 | 567 | dev->watchdog_timeo = 0; |
814f1b24 | 568 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; |
18722c24 JR |
569 | |
570 | dev->netdev_ops = &netdev_ops; | |
571 | dev->header_ops = &header_ops; | |
cf124db5 | 572 | dev->needs_free_netdev = true; |
18722c24 JR |
573 | } |
574 | ||
575 | static struct device_type bt_type = { | |
576 | .name = "bluetooth", | |
577 | }; | |
578 | ||
18722c24 JR |
579 | static void ifup(struct net_device *netdev) |
580 | { | |
581 | int err; | |
582 | ||
583 | rtnl_lock(); | |
00f54e68 | 584 | err = dev_open(netdev, NULL); |
18722c24 JR |
585 | if (err < 0) |
586 | BT_INFO("iface %s cannot be opened (%d)", netdev->name, err); | |
587 | rtnl_unlock(); | |
588 | } | |
589 | ||
7f118253 JR |
590 | static void ifdown(struct net_device *netdev) |
591 | { | |
7f118253 | 592 | rtnl_lock(); |
ddee3103 | 593 | dev_close(netdev); |
7f118253 JR |
594 | rtnl_unlock(); |
595 | } | |
596 | ||
18722c24 JR |
597 | static void do_notify_peers(struct work_struct *work) |
598 | { | |
2e4d60cb AA |
599 | struct lowpan_btle_dev *dev = container_of(work, struct lowpan_btle_dev, |
600 | notify_peers.work); | |
18722c24 JR |
601 | |
602 | netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */ | |
603 | } | |
604 | ||
605 | static bool is_bt_6lowpan(struct hci_conn *hcon) | |
606 | { | |
607 | if (hcon->type != LE_LINK) | |
608 | return false; | |
609 | ||
7b2ed60e | 610 | if (!enable_6lowpan) |
6b8d4a6a JR |
611 | return false; |
612 | ||
613 | return true; | |
18722c24 JR |
614 | } |
615 | ||
6b8d4a6a JR |
616 | static struct l2cap_chan *chan_create(void) |
617 | { | |
618 | struct l2cap_chan *chan; | |
619 | ||
620 | chan = l2cap_chan_create(); | |
621 | if (!chan) | |
622 | return NULL; | |
623 | ||
624 | l2cap_chan_set_defaults(chan); | |
625 | ||
626 | chan->chan_type = L2CAP_CHAN_CONN_ORIENTED; | |
627 | chan->mode = L2CAP_MODE_LE_FLOWCTL; | |
301de2cb | 628 | chan->imtu = 1280; |
6b8d4a6a JR |
629 | |
630 | return chan; | |
631 | } | |
632 | ||
6b8d4a6a | 633 | static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan, |
d2891c4d MS |
634 | struct lowpan_btle_dev *dev, |
635 | bool new_netdev) | |
18722c24 JR |
636 | { |
637 | struct lowpan_peer *peer; | |
18722c24 JR |
638 | |
639 | peer = kzalloc(sizeof(*peer), GFP_ATOMIC); | |
640 | if (!peer) | |
6b8d4a6a | 641 | return NULL; |
18722c24 | 642 | |
6b8d4a6a | 643 | peer->chan = chan; |
18722c24 | 644 | |
fa09ae66 | 645 | baswap((void *)peer->lladdr, &chan->dst); |
18722c24 | 646 | |
fa09ae66 | 647 | lowpan_iphc_uncompress_eui48_lladdr(&peer->peer_addr, peer->lladdr); |
18722c24 | 648 | |
90305829 | 649 | spin_lock(&devices_lock); |
18722c24 JR |
650 | INIT_LIST_HEAD(&peer->list); |
651 | peer_add(dev, peer); | |
90305829 | 652 | spin_unlock(&devices_lock); |
18722c24 JR |
653 | |
654 | /* Notifying peers about us needs to be done without locks held */ | |
d2891c4d MS |
655 | if (new_netdev) |
656 | INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers); | |
18722c24 JR |
657 | schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100)); |
658 | ||
6b8d4a6a | 659 | return peer->chan; |
18722c24 JR |
660 | } |
661 | ||
2e4d60cb | 662 | static int setup_netdev(struct l2cap_chan *chan, struct lowpan_btle_dev **dev) |
18722c24 | 663 | { |
18722c24 | 664 | struct net_device *netdev; |
a1916d34 | 665 | bdaddr_t addr; |
c469c9c9 | 666 | int err; |
18722c24 | 667 | |
2e4d60cb | 668 | netdev = alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_btle_dev)), |
b72f6f51 AA |
669 | IFACE_NAME_TEMPLATE, NET_NAME_UNKNOWN, |
670 | netdev_setup); | |
18722c24 JR |
671 | if (!netdev) |
672 | return -ENOMEM; | |
673 | ||
c259d141 | 674 | netdev->addr_assign_type = NET_ADDR_PERM; |
a1916d34 JK |
675 | baswap(&addr, &chan->src); |
676 | __dev_addr_set(netdev, &addr, sizeof(addr)); | |
18722c24 JR |
677 | |
678 | netdev->netdev_ops = &netdev_ops; | |
fc84242f | 679 | SET_NETDEV_DEV(netdev, &chan->conn->hcon->hdev->dev); |
18722c24 JR |
680 | SET_NETDEV_DEVTYPE(netdev, &bt_type); |
681 | ||
2e4d60cb | 682 | *dev = lowpan_btle_dev(netdev); |
5857d1db AA |
683 | (*dev)->netdev = netdev; |
684 | (*dev)->hdev = chan->conn->hcon->hdev; | |
685 | INIT_LIST_HEAD(&(*dev)->peers); | |
686 | ||
687 | spin_lock(&devices_lock); | |
688 | INIT_LIST_HEAD(&(*dev)->list); | |
689 | list_add_rcu(&(*dev)->list, &bt_6lowpan_devices); | |
690 | spin_unlock(&devices_lock); | |
691 | ||
00f59314 | 692 | err = lowpan_register_netdev(netdev, LOWPAN_LLTYPE_BTLE); |
18722c24 JR |
693 | if (err < 0) { |
694 | BT_INFO("register_netdev failed %d", err); | |
5857d1db AA |
695 | spin_lock(&devices_lock); |
696 | list_del_rcu(&(*dev)->list); | |
697 | spin_unlock(&devices_lock); | |
18722c24 JR |
698 | free_netdev(netdev); |
699 | goto out; | |
700 | } | |
701 | ||
6b8d4a6a JR |
702 | BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d", |
703 | netdev->ifindex, &chan->dst, chan->dst_type, | |
704 | &chan->src, chan->src_type); | |
18722c24 JR |
705 | set_bit(__LINK_STATE_PRESENT, &netdev->state); |
706 | ||
6b8d4a6a | 707 | return 0; |
18722c24 JR |
708 | |
709 | out: | |
710 | return err; | |
711 | } | |
712 | ||
6b8d4a6a JR |
713 | static inline void chan_ready_cb(struct l2cap_chan *chan) |
714 | { | |
2e4d60cb | 715 | struct lowpan_btle_dev *dev; |
d2891c4d | 716 | bool new_netdev = false; |
6b8d4a6a JR |
717 | |
718 | dev = lookup_dev(chan->conn); | |
719 | ||
720 | BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev); | |
721 | ||
722 | if (!dev) { | |
723 | if (setup_netdev(chan, &dev) < 0) { | |
724 | l2cap_chan_del(chan, -ENOENT); | |
725 | return; | |
726 | } | |
d2891c4d | 727 | new_netdev = true; |
6b8d4a6a JR |
728 | } |
729 | ||
18d93c17 JR |
730 | if (!try_module_get(THIS_MODULE)) |
731 | return; | |
732 | ||
d2891c4d | 733 | add_peer_chan(chan, dev, new_netdev); |
6b8d4a6a JR |
734 | ifup(dev->netdev); |
735 | } | |
736 | ||
2b293490 | 737 | static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan) |
6b8d4a6a | 738 | { |
2b293490 | 739 | struct l2cap_chan *chan; |
6b8d4a6a | 740 | |
630ef791 JH |
741 | chan = chan_create(); |
742 | if (!chan) | |
743 | return NULL; | |
744 | ||
2b293490 | 745 | chan->ops = pchan->ops; |
6b8d4a6a JR |
746 | |
747 | BT_DBG("chan %p pchan %p", chan, pchan); | |
748 | ||
2b293490 | 749 | return chan; |
6b8d4a6a JR |
750 | } |
751 | ||
18722c24 JR |
752 | static void delete_netdev(struct work_struct *work) |
753 | { | |
2e4d60cb AA |
754 | struct lowpan_btle_dev *entry = container_of(work, |
755 | struct lowpan_btle_dev, | |
756 | delete_netdev); | |
18722c24 | 757 | |
00f59314 | 758 | lowpan_unregister_netdev(entry->netdev); |
18722c24 | 759 | |
2ad88fb2 | 760 | /* The entry pointer is deleted by the netdev destructor. */ |
18722c24 JR |
761 | } |
762 | ||
6b8d4a6a | 763 | static void chan_close_cb(struct l2cap_chan *chan) |
18722c24 | 764 | { |
2e4d60cb AA |
765 | struct lowpan_btle_dev *entry; |
766 | struct lowpan_btle_dev *dev = NULL; | |
18722c24 JR |
767 | struct lowpan_peer *peer; |
768 | int err = -ENOENT; | |
f63666d2 | 769 | bool last = false, remove = true; |
18722c24 | 770 | |
6b8d4a6a JR |
771 | BT_DBG("chan %p conn %p", chan, chan->conn); |
772 | ||
773 | if (chan->conn && chan->conn->hcon) { | |
774 | if (!is_bt_6lowpan(chan->conn->hcon)) | |
775 | return; | |
776 | ||
777 | /* If conn is set, then the netdev is also there and we should | |
778 | * not remove it. | |
779 | */ | |
f63666d2 | 780 | remove = false; |
6b8d4a6a | 781 | } |
18722c24 | 782 | |
90305829 | 783 | spin_lock(&devices_lock); |
18722c24 | 784 | |
90305829 | 785 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
2e4d60cb | 786 | dev = lowpan_btle_dev(entry->netdev); |
90305829 | 787 | peer = __peer_lookup_chan(dev, chan); |
18722c24 JR |
788 | if (peer) { |
789 | last = peer_del(dev, peer); | |
790 | err = 0; | |
6b8d4a6a JR |
791 | |
792 | BT_DBG("dev %p removing %speer %p", dev, | |
793 | last ? "last " : "1 ", peer); | |
658d5d80 | 794 | BT_DBG("chan %p orig refcnt %u", chan, |
2c935bc5 | 795 | kref_read(&chan->kref)); |
6b8d4a6a JR |
796 | |
797 | l2cap_chan_put(chan); | |
18722c24 JR |
798 | break; |
799 | } | |
800 | } | |
801 | ||
802 | if (!err && last && dev && !atomic_read(&dev->peer_count)) { | |
90305829 | 803 | spin_unlock(&devices_lock); |
18722c24 JR |
804 | |
805 | cancel_delayed_work_sync(&dev->notify_peers); | |
806 | ||
7f118253 JR |
807 | ifdown(dev->netdev); |
808 | ||
f63666d2 | 809 | if (remove) { |
6b8d4a6a JR |
810 | INIT_WORK(&entry->delete_netdev, delete_netdev); |
811 | schedule_work(&entry->delete_netdev); | |
812 | } | |
18722c24 | 813 | } else { |
90305829 | 814 | spin_unlock(&devices_lock); |
18722c24 | 815 | } |
6b8d4a6a JR |
816 | } |
817 | ||
818 | static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err) | |
819 | { | |
820 | BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn, | |
821 | state_to_string(state), err); | |
822 | } | |
823 | ||
824 | static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan, | |
825 | unsigned long hdr_len, | |
826 | unsigned long len, int nb) | |
827 | { | |
828 | /* Note that we must allocate using GFP_ATOMIC here as | |
829 | * this function is called originally from netdev hard xmit | |
830 | * function in atomic context. | |
831 | */ | |
832 | return bt_skb_alloc(hdr_len + len, GFP_ATOMIC); | |
833 | } | |
834 | ||
835 | static void chan_suspend_cb(struct l2cap_chan *chan) | |
836 | { | |
f183e52b LAD |
837 | struct lowpan_btle_dev *dev; |
838 | ||
6dea44f5 | 839 | BT_DBG("chan %p suspend", chan); |
f183e52b LAD |
840 | |
841 | dev = lookup_dev(chan->conn); | |
842 | if (!dev || !dev->netdev) | |
843 | return; | |
844 | ||
845 | netif_stop_queue(dev->netdev); | |
6b8d4a6a JR |
846 | } |
847 | ||
848 | static void chan_resume_cb(struct l2cap_chan *chan) | |
849 | { | |
f183e52b LAD |
850 | struct lowpan_btle_dev *dev; |
851 | ||
6dea44f5 | 852 | BT_DBG("chan %p resume", chan); |
f183e52b LAD |
853 | |
854 | dev = lookup_dev(chan->conn); | |
855 | if (!dev || !dev->netdev) | |
856 | return; | |
857 | ||
858 | netif_wake_queue(dev->netdev); | |
6b8d4a6a JR |
859 | } |
860 | ||
861 | static long chan_get_sndtimeo_cb(struct l2cap_chan *chan) | |
862 | { | |
2ae50d8d | 863 | return L2CAP_CONN_TIMEOUT; |
6b8d4a6a JR |
864 | } |
865 | ||
866 | static const struct l2cap_ops bt_6lowpan_chan_ops = { | |
867 | .name = "L2CAP 6LoWPAN channel", | |
868 | .new_connection = chan_new_conn_cb, | |
869 | .recv = chan_recv_cb, | |
870 | .close = chan_close_cb, | |
871 | .state_change = chan_state_change_cb, | |
872 | .ready = chan_ready_cb, | |
873 | .resume = chan_resume_cb, | |
874 | .suspend = chan_suspend_cb, | |
875 | .get_sndtimeo = chan_get_sndtimeo_cb, | |
876 | .alloc_skb = chan_alloc_skb_cb, | |
6b8d4a6a JR |
877 | |
878 | .teardown = l2cap_chan_no_teardown, | |
879 | .defer = l2cap_chan_no_defer, | |
880 | .set_shutdown = l2cap_chan_no_set_shutdown, | |
881 | }; | |
882 | ||
6b8d4a6a JR |
883 | static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type) |
884 | { | |
0cd088fc | 885 | struct l2cap_chan *chan; |
6b8d4a6a JR |
886 | int err; |
887 | ||
26d46dff | 888 | chan = chan_create(); |
0cd088fc | 889 | if (!chan) |
6b8d4a6a JR |
890 | return -EINVAL; |
891 | ||
26d46dff JH |
892 | chan->ops = &bt_6lowpan_chan_ops; |
893 | ||
0cd088fc | 894 | err = l2cap_chan_connect(chan, cpu_to_le16(L2CAP_PSM_IPSP), 0, |
6b8d4a6a JR |
895 | addr, dst_type); |
896 | ||
0cd088fc | 897 | BT_DBG("chan %p err %d", chan, err); |
6b8d4a6a | 898 | if (err < 0) |
0cd088fc | 899 | l2cap_chan_put(chan); |
6b8d4a6a | 900 | |
18722c24 JR |
901 | return err; |
902 | } | |
903 | ||
6b8d4a6a JR |
904 | static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type) |
905 | { | |
906 | struct lowpan_peer *peer; | |
907 | ||
658d5d80 | 908 | BT_DBG("conn %p dst type %u", conn, dst_type); |
6b8d4a6a JR |
909 | |
910 | peer = lookup_peer(conn); | |
911 | if (!peer) | |
912 | return -ENOENT; | |
913 | ||
914 | BT_DBG("peer %p chan %p", peer, peer->chan); | |
915 | ||
916 | l2cap_chan_close(peer->chan, ENOENT); | |
917 | ||
918 | return 0; | |
919 | } | |
920 | ||
921 | static struct l2cap_chan *bt_6lowpan_listen(void) | |
922 | { | |
923 | bdaddr_t *addr = BDADDR_ANY; | |
0cd088fc | 924 | struct l2cap_chan *chan; |
6b8d4a6a JR |
925 | int err; |
926 | ||
7b2ed60e | 927 | if (!enable_6lowpan) |
6b8d4a6a JR |
928 | return NULL; |
929 | ||
26d46dff | 930 | chan = chan_create(); |
0cd088fc | 931 | if (!chan) |
6b8d4a6a JR |
932 | return NULL; |
933 | ||
26d46dff | 934 | chan->ops = &bt_6lowpan_chan_ops; |
0cd088fc JH |
935 | chan->state = BT_LISTEN; |
936 | chan->src_type = BDADDR_LE_PUBLIC; | |
6b8d4a6a | 937 | |
0cd088fc | 938 | atomic_set(&chan->nesting, L2CAP_NESTING_PARENT); |
2773b024 | 939 | |
658d5d80 | 940 | BT_DBG("chan %p src type %u", chan, chan->src_type); |
6b8d4a6a | 941 | |
0cd088fc | 942 | err = l2cap_add_psm(chan, addr, cpu_to_le16(L2CAP_PSM_IPSP)); |
6b8d4a6a | 943 | if (err) { |
0cd088fc | 944 | l2cap_chan_put(chan); |
6b8d4a6a JR |
945 | BT_ERR("psm cannot be added err %d", err); |
946 | return NULL; | |
947 | } | |
948 | ||
0cd088fc | 949 | return chan; |
6b8d4a6a JR |
950 | } |
951 | ||
952 | static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type, | |
953 | struct l2cap_conn **conn) | |
954 | { | |
955 | struct hci_conn *hcon; | |
956 | struct hci_dev *hdev; | |
6b8d4a6a JR |
957 | int n; |
958 | ||
959 | n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu", | |
960 | &addr->b[5], &addr->b[4], &addr->b[3], | |
961 | &addr->b[2], &addr->b[1], &addr->b[0], | |
962 | addr_type); | |
963 | ||
964 | if (n < 7) | |
965 | return -EINVAL; | |
966 | ||
39385cb5 JH |
967 | /* The LE_PUBLIC address type is ignored because of BDADDR_ANY */ |
968 | hdev = hci_get_route(addr, BDADDR_ANY, BDADDR_LE_PUBLIC); | |
6b8d4a6a JR |
969 | if (!hdev) |
970 | return -ENOENT; | |
971 | ||
972 | hci_dev_lock(hdev); | |
f5ad4ffc | 973 | hcon = hci_conn_hash_lookup_le(hdev, addr, *addr_type); |
6b8d4a6a | 974 | hci_dev_unlock(hdev); |
747da130 | 975 | hci_dev_put(hdev); |
6b8d4a6a JR |
976 | |
977 | if (!hcon) | |
978 | return -ENOENT; | |
979 | ||
980 | *conn = (struct l2cap_conn *)hcon->l2cap_data; | |
981 | ||
658d5d80 | 982 | BT_DBG("conn %p dst %pMR type %u", *conn, &hcon->dst, hcon->dst_type); |
6b8d4a6a JR |
983 | |
984 | return 0; | |
985 | } | |
986 | ||
987 | static void disconnect_all_peers(void) | |
988 | { | |
2e4d60cb | 989 | struct lowpan_btle_dev *entry; |
6b8d4a6a JR |
990 | struct lowpan_peer *peer, *tmp_peer, *new_peer; |
991 | struct list_head peers; | |
6b8d4a6a JR |
992 | |
993 | INIT_LIST_HEAD(&peers); | |
994 | ||
995 | /* We make a separate list of peers as the close_cb() will | |
996 | * modify the device peers list so it is better not to mess | |
997 | * with the same list at the same time. | |
998 | */ | |
999 | ||
90305829 | 1000 | rcu_read_lock(); |
6b8d4a6a | 1001 | |
90305829 JR |
1002 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
1003 | list_for_each_entry_rcu(peer, &entry->peers, list) { | |
6b8d4a6a JR |
1004 | new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC); |
1005 | if (!new_peer) | |
1006 | break; | |
1007 | ||
1008 | new_peer->chan = peer->chan; | |
1009 | INIT_LIST_HEAD(&new_peer->list); | |
1010 | ||
1011 | list_add(&new_peer->list, &peers); | |
1012 | } | |
1013 | } | |
1014 | ||
90305829 | 1015 | rcu_read_unlock(); |
6b8d4a6a | 1016 | |
90305829 | 1017 | spin_lock(&devices_lock); |
6b8d4a6a JR |
1018 | list_for_each_entry_safe(peer, tmp_peer, &peers, list) { |
1019 | l2cap_chan_close(peer->chan, ENOENT); | |
90305829 JR |
1020 | |
1021 | list_del_rcu(&peer->list); | |
4e790226 | 1022 | kfree_rcu(peer, rcu); |
6b8d4a6a | 1023 | } |
90305829 | 1024 | spin_unlock(&devices_lock); |
6b8d4a6a JR |
1025 | } |
1026 | ||
7b2ed60e | 1027 | struct set_enable { |
90305829 | 1028 | struct work_struct work; |
7b2ed60e | 1029 | bool flag; |
90305829 | 1030 | }; |
6b8d4a6a | 1031 | |
7b2ed60e | 1032 | static void do_enable_set(struct work_struct *work) |
90305829 | 1033 | { |
7b2ed60e JR |
1034 | struct set_enable *set_enable = container_of(work, |
1035 | struct set_enable, work); | |
90305829 | 1036 | |
7b2ed60e | 1037 | if (!set_enable->flag || enable_6lowpan != set_enable->flag) |
6b8d4a6a | 1038 | /* Disconnect existing connections if 6lowpan is |
7b2ed60e | 1039 | * disabled |
6b8d4a6a JR |
1040 | */ |
1041 | disconnect_all_peers(); | |
1042 | ||
7b2ed60e | 1043 | enable_6lowpan = set_enable->flag; |
6b8d4a6a | 1044 | |
f9c70bdc | 1045 | mutex_lock(&set_lock); |
6b8d4a6a JR |
1046 | if (listen_chan) { |
1047 | l2cap_chan_close(listen_chan, 0); | |
1048 | l2cap_chan_put(listen_chan); | |
1049 | } | |
1050 | ||
1051 | listen_chan = bt_6lowpan_listen(); | |
f9c70bdc | 1052 | mutex_unlock(&set_lock); |
6b8d4a6a | 1053 | |
7b2ed60e | 1054 | kfree(set_enable); |
90305829 JR |
1055 | } |
1056 | ||
7b2ed60e | 1057 | static int lowpan_enable_set(void *data, u64 val) |
90305829 | 1058 | { |
7b2ed60e | 1059 | struct set_enable *set_enable; |
90305829 | 1060 | |
7b2ed60e JR |
1061 | set_enable = kzalloc(sizeof(*set_enable), GFP_KERNEL); |
1062 | if (!set_enable) | |
90305829 JR |
1063 | return -ENOMEM; |
1064 | ||
7b2ed60e JR |
1065 | set_enable->flag = !!val; |
1066 | INIT_WORK(&set_enable->work, do_enable_set); | |
90305829 | 1067 | |
7b2ed60e | 1068 | schedule_work(&set_enable->work); |
90305829 | 1069 | |
6b8d4a6a JR |
1070 | return 0; |
1071 | } | |
1072 | ||
7b2ed60e | 1073 | static int lowpan_enable_get(void *data, u64 *val) |
6b8d4a6a | 1074 | { |
7b2ed60e | 1075 | *val = enable_6lowpan; |
6b8d4a6a JR |
1076 | return 0; |
1077 | } | |
1078 | ||
e250fab6 Y |
1079 | DEFINE_DEBUGFS_ATTRIBUTE(lowpan_enable_fops, lowpan_enable_get, |
1080 | lowpan_enable_set, "%llu\n"); | |
6b8d4a6a JR |
1081 | |
1082 | static ssize_t lowpan_control_write(struct file *fp, | |
1083 | const char __user *user_buffer, | |
1084 | size_t count, | |
1085 | loff_t *position) | |
1086 | { | |
1087 | char buf[32]; | |
1088 | size_t buf_size = min(count, sizeof(buf) - 1); | |
1089 | int ret; | |
1090 | bdaddr_t addr; | |
1091 | u8 addr_type; | |
1092 | struct l2cap_conn *conn = NULL; | |
1093 | ||
1094 | if (copy_from_user(buf, user_buffer, buf_size)) | |
1095 | return -EFAULT; | |
1096 | ||
1097 | buf[buf_size] = '\0'; | |
1098 | ||
1099 | if (memcmp(buf, "connect ", 8) == 0) { | |
1100 | ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn); | |
1101 | if (ret == -EINVAL) | |
1102 | return ret; | |
1103 | ||
f9c70bdc | 1104 | mutex_lock(&set_lock); |
6b8d4a6a JR |
1105 | if (listen_chan) { |
1106 | l2cap_chan_close(listen_chan, 0); | |
1107 | l2cap_chan_put(listen_chan); | |
1108 | listen_chan = NULL; | |
1109 | } | |
f9c70bdc | 1110 | mutex_unlock(&set_lock); |
6b8d4a6a JR |
1111 | |
1112 | if (conn) { | |
1113 | struct lowpan_peer *peer; | |
1114 | ||
1115 | if (!is_bt_6lowpan(conn->hcon)) | |
1116 | return -EINVAL; | |
1117 | ||
1118 | peer = lookup_peer(conn); | |
1119 | if (peer) { | |
1120 | BT_DBG("6LoWPAN connection already exists"); | |
1121 | return -EALREADY; | |
1122 | } | |
1123 | ||
658d5d80 | 1124 | BT_DBG("conn %p dst %pMR type %d user %u", conn, |
6b8d4a6a JR |
1125 | &conn->hcon->dst, conn->hcon->dst_type, |
1126 | addr_type); | |
1127 | } | |
1128 | ||
1129 | ret = bt_6lowpan_connect(&addr, addr_type); | |
1130 | if (ret < 0) | |
1131 | return ret; | |
1132 | ||
1133 | return count; | |
1134 | } | |
1135 | ||
1136 | if (memcmp(buf, "disconnect ", 11) == 0) { | |
1137 | ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn); | |
1138 | if (ret < 0) | |
1139 | return ret; | |
1140 | ||
1141 | ret = bt_6lowpan_disconnect(conn, addr_type); | |
1142 | if (ret < 0) | |
1143 | return ret; | |
1144 | ||
1145 | return count; | |
1146 | } | |
1147 | ||
1148 | return count; | |
1149 | } | |
1150 | ||
1151 | static int lowpan_control_show(struct seq_file *f, void *ptr) | |
1152 | { | |
2e4d60cb | 1153 | struct lowpan_btle_dev *entry; |
90305829 | 1154 | struct lowpan_peer *peer; |
6b8d4a6a | 1155 | |
90305829 | 1156 | spin_lock(&devices_lock); |
6b8d4a6a | 1157 | |
90305829 JR |
1158 | list_for_each_entry(entry, &bt_6lowpan_devices, list) { |
1159 | list_for_each_entry(peer, &entry->peers, list) | |
6b8d4a6a JR |
1160 | seq_printf(f, "%pMR (type %u)\n", |
1161 | &peer->chan->dst, peer->chan->dst_type); | |
1162 | } | |
1163 | ||
90305829 | 1164 | spin_unlock(&devices_lock); |
6b8d4a6a JR |
1165 | |
1166 | return 0; | |
1167 | } | |
1168 | ||
1169 | static int lowpan_control_open(struct inode *inode, struct file *file) | |
1170 | { | |
1171 | return single_open(file, lowpan_control_show, inode->i_private); | |
1172 | } | |
1173 | ||
1174 | static const struct file_operations lowpan_control_fops = { | |
1175 | .open = lowpan_control_open, | |
1176 | .read = seq_read, | |
1177 | .write = lowpan_control_write, | |
1178 | .llseek = seq_lseek, | |
1179 | .release = single_release, | |
1180 | }; | |
1181 | ||
7f118253 JR |
1182 | static void disconnect_devices(void) |
1183 | { | |
2e4d60cb | 1184 | struct lowpan_btle_dev *entry, *tmp, *new_dev; |
7f118253 | 1185 | struct list_head devices; |
7f118253 JR |
1186 | |
1187 | INIT_LIST_HEAD(&devices); | |
1188 | ||
1189 | /* We make a separate list of devices because the unregister_netdev() | |
1190 | * will call device_event() which will also want to modify the same | |
1191 | * devices list. | |
1192 | */ | |
1193 | ||
90305829 | 1194 | rcu_read_lock(); |
7f118253 | 1195 | |
90305829 | 1196 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
7f118253 JR |
1197 | new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC); |
1198 | if (!new_dev) | |
1199 | break; | |
1200 | ||
1201 | new_dev->netdev = entry->netdev; | |
1202 | INIT_LIST_HEAD(&new_dev->list); | |
1203 | ||
90305829 | 1204 | list_add_rcu(&new_dev->list, &devices); |
7f118253 JR |
1205 | } |
1206 | ||
90305829 | 1207 | rcu_read_unlock(); |
7f118253 | 1208 | |
daac197c | 1209 | list_for_each_entry_safe(entry, tmp, &devices, list) { |
7f118253 JR |
1210 | ifdown(entry->netdev); |
1211 | BT_DBG("Unregistering netdev %s %p", | |
1212 | entry->netdev->name, entry->netdev); | |
00f59314 | 1213 | lowpan_unregister_netdev(entry->netdev); |
7f118253 JR |
1214 | kfree(entry); |
1215 | } | |
1216 | } | |
1217 | ||
18722c24 JR |
1218 | static int device_event(struct notifier_block *unused, |
1219 | unsigned long event, void *ptr) | |
1220 | { | |
1221 | struct net_device *netdev = netdev_notifier_info_to_dev(ptr); | |
2e4d60cb | 1222 | struct lowpan_btle_dev *entry; |
18722c24 JR |
1223 | |
1224 | if (netdev->type != ARPHRD_6LOWPAN) | |
1225 | return NOTIFY_DONE; | |
1226 | ||
1227 | switch (event) { | |
1228 | case NETDEV_UNREGISTER: | |
90305829 JR |
1229 | spin_lock(&devices_lock); |
1230 | list_for_each_entry(entry, &bt_6lowpan_devices, list) { | |
18722c24 | 1231 | if (entry->netdev == netdev) { |
7f118253 JR |
1232 | BT_DBG("Unregistered netdev %s %p", |
1233 | netdev->name, netdev); | |
18722c24 | 1234 | list_del(&entry->list); |
18722c24 JR |
1235 | break; |
1236 | } | |
1237 | } | |
90305829 | 1238 | spin_unlock(&devices_lock); |
18722c24 JR |
1239 | break; |
1240 | } | |
1241 | ||
1242 | return NOTIFY_DONE; | |
1243 | } | |
1244 | ||
1245 | static struct notifier_block bt_6lowpan_dev_notifier = { | |
1246 | .notifier_call = device_event, | |
1247 | }; | |
1248 | ||
5547e48c | 1249 | static int __init bt_6lowpan_init(void) |
18722c24 | 1250 | { |
e250fab6 Y |
1251 | lowpan_enable_debugfs = debugfs_create_file_unsafe("6lowpan_enable", |
1252 | 0644, bt_debugfs, | |
1253 | NULL, | |
1254 | &lowpan_enable_fops); | |
6b8d4a6a JR |
1255 | lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644, |
1256 | bt_debugfs, NULL, | |
1257 | &lowpan_control_fops); | |
1258 | ||
18722c24 JR |
1259 | return register_netdevice_notifier(&bt_6lowpan_dev_notifier); |
1260 | } | |
1261 | ||
5547e48c | 1262 | static void __exit bt_6lowpan_exit(void) |
18722c24 | 1263 | { |
7b2ed60e | 1264 | debugfs_remove(lowpan_enable_debugfs); |
6b8d4a6a JR |
1265 | debugfs_remove(lowpan_control_debugfs); |
1266 | ||
1267 | if (listen_chan) { | |
1268 | l2cap_chan_close(listen_chan, 0); | |
1269 | l2cap_chan_put(listen_chan); | |
1270 | } | |
1271 | ||
7f118253 JR |
1272 | disconnect_devices(); |
1273 | ||
18722c24 JR |
1274 | unregister_netdevice_notifier(&bt_6lowpan_dev_notifier); |
1275 | } | |
5547e48c JR |
1276 | |
1277 | module_init(bt_6lowpan_init); | |
1278 | module_exit(bt_6lowpan_exit); | |
1279 | ||
1280 | MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>"); | |
1281 | MODULE_DESCRIPTION("Bluetooth 6LoWPAN"); | |
1282 | MODULE_VERSION(VERSION); | |
1283 | MODULE_LICENSE("GPL"); |