Commit | Line | Data |
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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; | |
53 | ||
18722c24 JR |
54 | struct lowpan_peer { |
55 | struct list_head list; | |
90305829 | 56 | struct rcu_head rcu; |
6b8d4a6a | 57 | struct l2cap_chan *chan; |
18722c24 JR |
58 | |
59 | /* peer addresses in various formats */ | |
fa09ae66 | 60 | unsigned char lladdr[ETH_ALEN]; |
18722c24 JR |
61 | struct in6_addr peer_addr; |
62 | }; | |
63 | ||
2e4d60cb | 64 | struct lowpan_btle_dev { |
18722c24 JR |
65 | struct list_head list; |
66 | ||
67 | struct hci_dev *hdev; | |
68 | struct net_device *netdev; | |
69 | struct list_head peers; | |
70 | atomic_t peer_count; /* number of items in peers list */ | |
71 | ||
72 | struct work_struct delete_netdev; | |
73 | struct delayed_work notify_peers; | |
74 | }; | |
75 | ||
2e4d60cb AA |
76 | static inline struct lowpan_btle_dev * |
77 | lowpan_btle_dev(const struct net_device *netdev) | |
18722c24 | 78 | { |
2e4d60cb | 79 | return (struct lowpan_btle_dev *)lowpan_dev(netdev)->priv; |
18722c24 JR |
80 | } |
81 | ||
2e4d60cb AA |
82 | static inline void peer_add(struct lowpan_btle_dev *dev, |
83 | struct lowpan_peer *peer) | |
18722c24 | 84 | { |
90305829 | 85 | list_add_rcu(&peer->list, &dev->peers); |
18722c24 JR |
86 | atomic_inc(&dev->peer_count); |
87 | } | |
88 | ||
2e4d60cb AA |
89 | static inline bool peer_del(struct lowpan_btle_dev *dev, |
90 | struct lowpan_peer *peer) | |
18722c24 | 91 | { |
90305829 | 92 | list_del_rcu(&peer->list); |
4e790226 | 93 | kfree_rcu(peer, rcu); |
18722c24 | 94 | |
18d93c17 JR |
95 | module_put(THIS_MODULE); |
96 | ||
18722c24 JR |
97 | if (atomic_dec_and_test(&dev->peer_count)) { |
98 | BT_DBG("last peer"); | |
99 | return true; | |
100 | } | |
101 | ||
102 | return false; | |
103 | } | |
104 | ||
2e4d60cb | 105 | static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_btle_dev *dev, |
18722c24 JR |
106 | bdaddr_t *ba, __u8 type) |
107 | { | |
90305829 | 108 | struct lowpan_peer *peer; |
18722c24 JR |
109 | |
110 | BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count), | |
111 | ba, type); | |
112 | ||
90305829 JR |
113 | rcu_read_lock(); |
114 | ||
115 | list_for_each_entry_rcu(peer, &dev->peers, list) { | |
6b8d4a6a JR |
116 | BT_DBG("dst addr %pMR dst type %d", |
117 | &peer->chan->dst, peer->chan->dst_type); | |
18722c24 | 118 | |
6b8d4a6a | 119 | if (bacmp(&peer->chan->dst, ba)) |
18722c24 JR |
120 | continue; |
121 | ||
90305829 JR |
122 | if (type == peer->chan->dst_type) { |
123 | rcu_read_unlock(); | |
6b8d4a6a | 124 | return peer; |
90305829 | 125 | } |
6b8d4a6a JR |
126 | } |
127 | ||
90305829 JR |
128 | rcu_read_unlock(); |
129 | ||
6b8d4a6a JR |
130 | return NULL; |
131 | } | |
132 | ||
2e4d60cb AA |
133 | static inline struct lowpan_peer * |
134 | __peer_lookup_chan(struct lowpan_btle_dev *dev, struct l2cap_chan *chan) | |
6b8d4a6a | 135 | { |
90305829 | 136 | struct lowpan_peer *peer; |
6b8d4a6a | 137 | |
90305829 | 138 | list_for_each_entry_rcu(peer, &dev->peers, list) { |
6b8d4a6a | 139 | if (peer->chan == chan) |
18722c24 JR |
140 | return peer; |
141 | } | |
142 | ||
143 | return NULL; | |
144 | } | |
145 | ||
2e4d60cb AA |
146 | static inline struct lowpan_peer * |
147 | __peer_lookup_conn(struct lowpan_btle_dev *dev, struct l2cap_conn *conn) | |
18722c24 | 148 | { |
90305829 | 149 | struct lowpan_peer *peer; |
18722c24 | 150 | |
90305829 | 151 | list_for_each_entry_rcu(peer, &dev->peers, list) { |
6b8d4a6a | 152 | if (peer->chan->conn == conn) |
18722c24 JR |
153 | return peer; |
154 | } | |
155 | ||
156 | return NULL; | |
157 | } | |
158 | ||
2e4d60cb | 159 | static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_btle_dev *dev, |
39e90c77 JR |
160 | struct in6_addr *daddr, |
161 | struct sk_buff *skb) | |
162 | { | |
39e90c77 JR |
163 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
164 | int count = atomic_read(&dev->peer_count); | |
9b1c1ef1 ND |
165 | const struct in6_addr *nexthop; |
166 | struct lowpan_peer *peer; | |
5636376c | 167 | struct neighbour *neigh; |
39e90c77 JR |
168 | |
169 | BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt); | |
170 | ||
39e90c77 | 171 | if (!rt) { |
b188b032 JM |
172 | if (ipv6_addr_any(&lowpan_cb(skb)->gw)) { |
173 | /* There is neither route nor gateway, | |
174 | * probably the destination is a direct peer. | |
175 | */ | |
176 | nexthop = daddr; | |
177 | } else { | |
178 | /* There is a known gateway | |
179 | */ | |
180 | nexthop = &lowpan_cb(skb)->gw; | |
181 | } | |
39e90c77 | 182 | } else { |
2647a9b0 | 183 | nexthop = rt6_nexthop(rt, daddr); |
39e90c77 JR |
184 | |
185 | /* We need to remember the address because it is needed | |
186 | * by bt_xmit() when sending the packet. In bt_xmit(), the | |
187 | * destination routing info is not set. | |
188 | */ | |
189 | memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr)); | |
190 | } | |
191 | ||
192 | BT_DBG("gw %pI6c", nexthop); | |
193 | ||
90305829 JR |
194 | rcu_read_lock(); |
195 | ||
196 | list_for_each_entry_rcu(peer, &dev->peers, list) { | |
39e90c77 JR |
197 | BT_DBG("dst addr %pMR dst type %d ip %pI6c", |
198 | &peer->chan->dst, peer->chan->dst_type, | |
199 | &peer->peer_addr); | |
200 | ||
90305829 JR |
201 | if (!ipv6_addr_cmp(&peer->peer_addr, nexthop)) { |
202 | rcu_read_unlock(); | |
39e90c77 | 203 | return peer; |
90305829 | 204 | } |
39e90c77 JR |
205 | } |
206 | ||
5636376c JM |
207 | /* use the neighbour cache for matching addresses assigned by SLAAC |
208 | */ | |
209 | neigh = __ipv6_neigh_lookup(dev->netdev, nexthop); | |
210 | if (neigh) { | |
211 | list_for_each_entry_rcu(peer, &dev->peers, list) { | |
212 | if (!memcmp(neigh->ha, peer->lladdr, ETH_ALEN)) { | |
213 | neigh_release(neigh); | |
214 | rcu_read_unlock(); | |
215 | return peer; | |
216 | } | |
217 | } | |
218 | neigh_release(neigh); | |
219 | } | |
220 | ||
90305829 JR |
221 | rcu_read_unlock(); |
222 | ||
39e90c77 JR |
223 | return NULL; |
224 | } | |
225 | ||
18722c24 JR |
226 | static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn) |
227 | { | |
2e4d60cb | 228 | struct lowpan_btle_dev *entry; |
18722c24 | 229 | struct lowpan_peer *peer = NULL; |
18722c24 | 230 | |
90305829 | 231 | rcu_read_lock(); |
18722c24 | 232 | |
90305829 JR |
233 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
234 | peer = __peer_lookup_conn(entry, conn); | |
18722c24 JR |
235 | if (peer) |
236 | break; | |
237 | } | |
238 | ||
90305829 | 239 | rcu_read_unlock(); |
18722c24 JR |
240 | |
241 | return peer; | |
242 | } | |
243 | ||
2e4d60cb | 244 | static struct lowpan_btle_dev *lookup_dev(struct l2cap_conn *conn) |
18722c24 | 245 | { |
2e4d60cb AA |
246 | struct lowpan_btle_dev *entry; |
247 | struct lowpan_btle_dev *dev = NULL; | |
18722c24 | 248 | |
90305829 | 249 | rcu_read_lock(); |
18722c24 | 250 | |
90305829 | 251 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
18722c24 JR |
252 | if (conn->hcon->hdev == entry->hdev) { |
253 | dev = entry; | |
254 | break; | |
255 | } | |
256 | } | |
257 | ||
90305829 | 258 | rcu_read_unlock(); |
18722c24 JR |
259 | |
260 | return dev; | |
261 | } | |
262 | ||
18722c24 JR |
263 | static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev) |
264 | { | |
265 | struct sk_buff *skb_cp; | |
18722c24 JR |
266 | |
267 | skb_cp = skb_copy(skb, GFP_ATOMIC); | |
268 | if (!skb_cp) | |
f8b36176 | 269 | return NET_RX_DROP; |
18722c24 | 270 | |
324e786e | 271 | return netif_rx_ni(skb_cp); |
18722c24 JR |
272 | } |
273 | ||
01141234 | 274 | static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev, |
27ce68a3 | 275 | struct lowpan_peer *peer) |
18722c24 | 276 | { |
c259d141 | 277 | const u8 *saddr; |
18722c24 | 278 | |
fa09ae66 | 279 | saddr = peer->lladdr; |
18722c24 | 280 | |
fa09ae66 | 281 | return lowpan_header_decompress(skb, netdev, netdev->dev_addr, saddr); |
18722c24 JR |
282 | } |
283 | ||
284 | static int recv_pkt(struct sk_buff *skb, struct net_device *dev, | |
27ce68a3 | 285 | struct lowpan_peer *peer) |
18722c24 JR |
286 | { |
287 | struct sk_buff *local_skb; | |
288 | int ret; | |
289 | ||
290 | if (!netif_running(dev)) | |
291 | goto drop; | |
292 | ||
cefdb801 | 293 | if (dev->type != ARPHRD_6LOWPAN || !skb->len) |
18722c24 JR |
294 | goto drop; |
295 | ||
cefdb801 AA |
296 | skb_reset_network_header(skb); |
297 | ||
11e3ff70 MT |
298 | skb = skb_share_check(skb, GFP_ATOMIC); |
299 | if (!skb) | |
300 | goto drop; | |
301 | ||
18722c24 | 302 | /* check that it's our buffer */ |
cefdb801 | 303 | if (lowpan_is_ipv6(*skb_network_header(skb))) { |
87f5fedb LD |
304 | /* Pull off the 1-byte of 6lowpan header. */ |
305 | skb_pull(skb, 1); | |
306 | ||
18722c24 JR |
307 | /* Copy the packet so that the IPv6 header is |
308 | * properly aligned. | |
309 | */ | |
310 | local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1, | |
311 | skb_tailroom(skb), GFP_ATOMIC); | |
312 | if (!local_skb) | |
313 | goto drop; | |
314 | ||
315 | local_skb->protocol = htons(ETH_P_IPV6); | |
316 | local_skb->pkt_type = PACKET_HOST; | |
4c58f328 | 317 | local_skb->dev = dev; |
18722c24 | 318 | |
18722c24 JR |
319 | skb_set_transport_header(local_skb, sizeof(struct ipv6hdr)); |
320 | ||
321 | if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) { | |
322 | kfree_skb(local_skb); | |
323 | goto drop; | |
324 | } | |
325 | ||
326 | dev->stats.rx_bytes += skb->len; | |
327 | dev->stats.rx_packets++; | |
328 | ||
3c400b84 MT |
329 | consume_skb(local_skb); |
330 | consume_skb(skb); | |
cefdb801 AA |
331 | } else if (lowpan_is_iphc(*skb_network_header(skb))) { |
332 | local_skb = skb_clone(skb, GFP_ATOMIC); | |
333 | if (!local_skb) | |
334 | goto drop; | |
335 | ||
4c58f328 GRB |
336 | local_skb->dev = dev; |
337 | ||
27ce68a3 | 338 | ret = iphc_decompress(local_skb, dev, peer); |
cefdb801 | 339 | if (ret < 0) { |
da75fdc6 | 340 | BT_DBG("iphc_decompress failed: %d", ret); |
cefdb801 AA |
341 | kfree_skb(local_skb); |
342 | goto drop; | |
343 | } | |
344 | ||
345 | local_skb->protocol = htons(ETH_P_IPV6); | |
346 | local_skb->pkt_type = PACKET_HOST; | |
cefdb801 AA |
347 | |
348 | if (give_skb_to_upper(local_skb, dev) | |
349 | != NET_RX_SUCCESS) { | |
350 | kfree_skb(local_skb); | |
351 | goto drop; | |
18722c24 | 352 | } |
cefdb801 AA |
353 | |
354 | dev->stats.rx_bytes += skb->len; | |
355 | dev->stats.rx_packets++; | |
356 | ||
357 | consume_skb(local_skb); | |
358 | consume_skb(skb); | |
359 | } else { | |
da75fdc6 | 360 | BT_DBG("unknown packet type"); |
cefdb801 | 361 | goto drop; |
18722c24 JR |
362 | } |
363 | ||
364 | return NET_RX_SUCCESS; | |
365 | ||
366 | drop: | |
6b8d4a6a | 367 | dev->stats.rx_dropped++; |
18722c24 JR |
368 | return NET_RX_DROP; |
369 | } | |
370 | ||
371 | /* Packet from BT LE device */ | |
6b8d4a6a | 372 | static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
18722c24 | 373 | { |
2e4d60cb | 374 | struct lowpan_btle_dev *dev; |
18722c24 JR |
375 | struct lowpan_peer *peer; |
376 | int err; | |
377 | ||
6b8d4a6a | 378 | peer = lookup_peer(chan->conn); |
18722c24 JR |
379 | if (!peer) |
380 | return -ENOENT; | |
381 | ||
6b8d4a6a | 382 | dev = lookup_dev(chan->conn); |
30d3db44 | 383 | if (!dev || !dev->netdev) |
18722c24 JR |
384 | return -ENOENT; |
385 | ||
27ce68a3 | 386 | err = recv_pkt(skb, dev->netdev, peer); |
6b8d4a6a JR |
387 | if (err) { |
388 | BT_DBG("recv pkt %d", err); | |
389 | err = -EAGAIN; | |
18722c24 JR |
390 | } |
391 | ||
6b8d4a6a | 392 | return err; |
18722c24 JR |
393 | } |
394 | ||
36b3dd25 JR |
395 | static int setup_header(struct sk_buff *skb, struct net_device *netdev, |
396 | bdaddr_t *peer_addr, u8 *peer_addr_type) | |
18722c24 | 397 | { |
36b3dd25 | 398 | struct in6_addr ipv6_daddr; |
55441070 | 399 | struct ipv6hdr *hdr; |
2e4d60cb | 400 | struct lowpan_btle_dev *dev; |
18722c24 | 401 | struct lowpan_peer *peer; |
9dae2e03 | 402 | u8 *daddr; |
36b3dd25 | 403 | int err, status = 0; |
18722c24 | 404 | |
55441070 GRB |
405 | hdr = ipv6_hdr(skb); |
406 | ||
2e4d60cb | 407 | dev = lowpan_btle_dev(netdev); |
18722c24 | 408 | |
55441070 | 409 | memcpy(&ipv6_daddr, &hdr->daddr, sizeof(ipv6_daddr)); |
36b3dd25 JR |
410 | |
411 | if (ipv6_addr_is_multicast(&ipv6_daddr)) { | |
6b8d4a6a | 412 | lowpan_cb(skb)->chan = NULL; |
9dae2e03 | 413 | daddr = NULL; |
18722c24 | 414 | } else { |
9dae2e03 | 415 | BT_DBG("dest IP %pI6c", &ipv6_daddr); |
18722c24 | 416 | |
9dae2e03 LAD |
417 | /* The packet might be sent to 6lowpan interface |
418 | * because of routing (either via default route | |
419 | * or user set route) so get peer according to | |
420 | * the destination address. | |
18722c24 | 421 | */ |
9dae2e03 | 422 | peer = peer_lookup_dst(dev, &ipv6_daddr, skb); |
18722c24 | 423 | if (!peer) { |
9dae2e03 LAD |
424 | BT_DBG("no such peer"); |
425 | return -ENOENT; | |
18722c24 JR |
426 | } |
427 | ||
fa09ae66 | 428 | daddr = peer->lladdr; |
fa0eaf84 | 429 | *peer_addr = peer->chan->dst; |
9dae2e03 | 430 | *peer_addr_type = peer->chan->dst_type; |
6b8d4a6a | 431 | lowpan_cb(skb)->chan = peer->chan; |
36b3dd25 JR |
432 | |
433 | status = 1; | |
18722c24 JR |
434 | } |
435 | ||
a6f77389 | 436 | lowpan_header_compress(skb, netdev, daddr, dev->netdev->dev_addr); |
36b3dd25 JR |
437 | |
438 | err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0); | |
439 | if (err < 0) | |
440 | return err; | |
441 | ||
442 | return status; | |
443 | } | |
444 | ||
445 | static int header_create(struct sk_buff *skb, struct net_device *netdev, | |
446 | unsigned short type, const void *_daddr, | |
447 | const void *_saddr, unsigned int len) | |
448 | { | |
36b3dd25 JR |
449 | if (type != ETH_P_IPV6) |
450 | return -EINVAL; | |
451 | ||
36b3dd25 | 452 | return 0; |
18722c24 JR |
453 | } |
454 | ||
455 | /* Packet to BT LE device */ | |
6b8d4a6a | 456 | static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb, |
d7b6b0a5 | 457 | struct net_device *netdev) |
18722c24 | 458 | { |
6b8d4a6a JR |
459 | struct msghdr msg; |
460 | struct kvec iv; | |
461 | int err; | |
462 | ||
463 | /* Remember the skb so that we can send EAGAIN to the caller if | |
d7b6b0a5 | 464 | * we run out of credits. |
6b8d4a6a | 465 | */ |
d7b6b0a5 | 466 | chan->data = skb; |
6b8d4a6a | 467 | |
6b8d4a6a JR |
468 | iv.iov_base = skb->data; |
469 | iv.iov_len = skb->len; | |
470 | ||
c0371da6 | 471 | memset(&msg, 0, sizeof(msg)); |
aa563d7b | 472 | iov_iter_kvec(&msg.msg_iter, WRITE, &iv, 1, skb->len); |
c0371da6 | 473 | |
6b8d4a6a JR |
474 | err = l2cap_chan_send(chan, &msg, skb->len); |
475 | if (err > 0) { | |
476 | netdev->stats.tx_bytes += err; | |
477 | netdev->stats.tx_packets++; | |
478 | return 0; | |
479 | } | |
480 | ||
e1008f95 LAD |
481 | if (err < 0) |
482 | netdev->stats.tx_errors++; | |
18722c24 | 483 | |
6b8d4a6a | 484 | return err; |
18722c24 JR |
485 | } |
486 | ||
9c238ca8 | 487 | static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev) |
18722c24 JR |
488 | { |
489 | struct sk_buff *local_skb; | |
2e4d60cb | 490 | struct lowpan_btle_dev *entry; |
9c238ca8 | 491 | int err = 0; |
18722c24 | 492 | |
90305829 | 493 | rcu_read_lock(); |
18722c24 | 494 | |
90305829 JR |
495 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
496 | struct lowpan_peer *pentry; | |
2e4d60cb | 497 | struct lowpan_btle_dev *dev; |
18722c24 JR |
498 | |
499 | if (entry->netdev != netdev) | |
500 | continue; | |
501 | ||
2e4d60cb | 502 | dev = lowpan_btle_dev(entry->netdev); |
18722c24 | 503 | |
90305829 | 504 | list_for_each_entry_rcu(pentry, &dev->peers, list) { |
9c238ca8 JR |
505 | int ret; |
506 | ||
18722c24 JR |
507 | local_skb = skb_clone(skb, GFP_ATOMIC); |
508 | ||
36b3dd25 JR |
509 | BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p", |
510 | netdev->name, | |
511 | &pentry->chan->dst, pentry->chan->dst_type, | |
512 | &pentry->peer_addr, pentry->chan); | |
9c238ca8 JR |
513 | ret = send_pkt(pentry->chan, local_skb, netdev); |
514 | if (ret < 0) | |
515 | err = ret; | |
18722c24 JR |
516 | |
517 | kfree_skb(local_skb); | |
518 | } | |
519 | } | |
520 | ||
90305829 | 521 | rcu_read_unlock(); |
9c238ca8 JR |
522 | |
523 | return err; | |
18722c24 JR |
524 | } |
525 | ||
526 | static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev) | |
527 | { | |
528 | int err = 0; | |
18722c24 JR |
529 | bdaddr_t addr; |
530 | u8 addr_type; | |
531 | ||
36b3dd25 JR |
532 | /* We must take a copy of the skb before we modify/replace the ipv6 |
533 | * header as the header could be used elsewhere | |
534 | */ | |
b0c42cd7 AA |
535 | skb = skb_unshare(skb, GFP_ATOMIC); |
536 | if (!skb) | |
36b3dd25 JR |
537 | return NET_XMIT_DROP; |
538 | ||
539 | /* Return values from setup_header() | |
540 | * <0 - error, packet is dropped | |
541 | * 0 - this is a multicast packet | |
542 | * 1 - this is unicast packet | |
543 | */ | |
544 | err = setup_header(skb, netdev, &addr, &addr_type); | |
545 | if (err < 0) { | |
546 | kfree_skb(skb); | |
547 | return NET_XMIT_DROP; | |
548 | } | |
18722c24 | 549 | |
36b3dd25 JR |
550 | if (err) { |
551 | if (lowpan_cb(skb)->chan) { | |
552 | BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p", | |
553 | netdev->name, &addr, addr_type, | |
554 | &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan); | |
d7b6b0a5 | 555 | err = send_pkt(lowpan_cb(skb)->chan, skb, netdev); |
36b3dd25 | 556 | } else { |
6b8d4a6a | 557 | err = -ENOENT; |
36b3dd25 JR |
558 | } |
559 | } else { | |
560 | /* We need to send the packet to every device behind this | |
561 | * interface. | |
562 | */ | |
9c238ca8 | 563 | err = send_mcast_pkt(skb, netdev); |
18722c24 | 564 | } |
18722c24 | 565 | |
fc12518a JR |
566 | dev_kfree_skb(skb); |
567 | ||
18722c24 JR |
568 | if (err) |
569 | BT_DBG("ERROR: xmit failed (%d)", err); | |
570 | ||
36b3dd25 | 571 | return err < 0 ? NET_XMIT_DROP : err; |
18722c24 JR |
572 | } |
573 | ||
574 | static const struct net_device_ops netdev_ops = { | |
575 | .ndo_start_xmit = bt_xmit, | |
576 | }; | |
577 | ||
569428da | 578 | static const struct header_ops header_ops = { |
18722c24 JR |
579 | .create = header_create, |
580 | }; | |
581 | ||
582 | static void netdev_setup(struct net_device *dev) | |
583 | { | |
18722c24 JR |
584 | dev->hard_header_len = 0; |
585 | dev->needed_tailroom = 0; | |
25869522 | 586 | dev->flags = IFF_RUNNING | IFF_MULTICAST; |
18722c24 | 587 | dev->watchdog_timeo = 0; |
814f1b24 | 588 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; |
18722c24 JR |
589 | |
590 | dev->netdev_ops = &netdev_ops; | |
591 | dev->header_ops = &header_ops; | |
cf124db5 | 592 | dev->needs_free_netdev = true; |
18722c24 JR |
593 | } |
594 | ||
595 | static struct device_type bt_type = { | |
596 | .name = "bluetooth", | |
597 | }; | |
598 | ||
18722c24 JR |
599 | static void ifup(struct net_device *netdev) |
600 | { | |
601 | int err; | |
602 | ||
603 | rtnl_lock(); | |
00f54e68 | 604 | err = dev_open(netdev, NULL); |
18722c24 JR |
605 | if (err < 0) |
606 | BT_INFO("iface %s cannot be opened (%d)", netdev->name, err); | |
607 | rtnl_unlock(); | |
608 | } | |
609 | ||
7f118253 JR |
610 | static void ifdown(struct net_device *netdev) |
611 | { | |
7f118253 | 612 | rtnl_lock(); |
ddee3103 | 613 | dev_close(netdev); |
7f118253 JR |
614 | rtnl_unlock(); |
615 | } | |
616 | ||
18722c24 JR |
617 | static void do_notify_peers(struct work_struct *work) |
618 | { | |
2e4d60cb AA |
619 | struct lowpan_btle_dev *dev = container_of(work, struct lowpan_btle_dev, |
620 | notify_peers.work); | |
18722c24 JR |
621 | |
622 | netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */ | |
623 | } | |
624 | ||
625 | static bool is_bt_6lowpan(struct hci_conn *hcon) | |
626 | { | |
627 | if (hcon->type != LE_LINK) | |
628 | return false; | |
629 | ||
7b2ed60e | 630 | if (!enable_6lowpan) |
6b8d4a6a JR |
631 | return false; |
632 | ||
633 | return true; | |
18722c24 JR |
634 | } |
635 | ||
6b8d4a6a JR |
636 | static struct l2cap_chan *chan_create(void) |
637 | { | |
638 | struct l2cap_chan *chan; | |
639 | ||
640 | chan = l2cap_chan_create(); | |
641 | if (!chan) | |
642 | return NULL; | |
643 | ||
644 | l2cap_chan_set_defaults(chan); | |
645 | ||
646 | chan->chan_type = L2CAP_CHAN_CONN_ORIENTED; | |
647 | chan->mode = L2CAP_MODE_LE_FLOWCTL; | |
301de2cb | 648 | chan->imtu = 1280; |
6b8d4a6a JR |
649 | |
650 | return chan; | |
651 | } | |
652 | ||
6b8d4a6a | 653 | static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan, |
d2891c4d MS |
654 | struct lowpan_btle_dev *dev, |
655 | bool new_netdev) | |
18722c24 JR |
656 | { |
657 | struct lowpan_peer *peer; | |
18722c24 JR |
658 | |
659 | peer = kzalloc(sizeof(*peer), GFP_ATOMIC); | |
660 | if (!peer) | |
6b8d4a6a | 661 | return NULL; |
18722c24 | 662 | |
6b8d4a6a | 663 | peer->chan = chan; |
18722c24 JR |
664 | memset(&peer->peer_addr, 0, sizeof(struct in6_addr)); |
665 | ||
fa09ae66 | 666 | baswap((void *)peer->lladdr, &chan->dst); |
18722c24 | 667 | |
fa09ae66 | 668 | lowpan_iphc_uncompress_eui48_lladdr(&peer->peer_addr, peer->lladdr); |
18722c24 | 669 | |
90305829 | 670 | spin_lock(&devices_lock); |
18722c24 JR |
671 | INIT_LIST_HEAD(&peer->list); |
672 | peer_add(dev, peer); | |
90305829 | 673 | spin_unlock(&devices_lock); |
18722c24 JR |
674 | |
675 | /* Notifying peers about us needs to be done without locks held */ | |
d2891c4d MS |
676 | if (new_netdev) |
677 | INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers); | |
18722c24 JR |
678 | schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100)); |
679 | ||
6b8d4a6a | 680 | return peer->chan; |
18722c24 JR |
681 | } |
682 | ||
2e4d60cb | 683 | static int setup_netdev(struct l2cap_chan *chan, struct lowpan_btle_dev **dev) |
18722c24 | 684 | { |
18722c24 JR |
685 | struct net_device *netdev; |
686 | int err = 0; | |
18722c24 | 687 | |
2e4d60cb | 688 | netdev = alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_btle_dev)), |
b72f6f51 AA |
689 | IFACE_NAME_TEMPLATE, NET_NAME_UNKNOWN, |
690 | netdev_setup); | |
18722c24 JR |
691 | if (!netdev) |
692 | return -ENOMEM; | |
693 | ||
c259d141 PF |
694 | netdev->addr_assign_type = NET_ADDR_PERM; |
695 | baswap((void *)netdev->dev_addr, &chan->src); | |
18722c24 JR |
696 | |
697 | netdev->netdev_ops = &netdev_ops; | |
fc84242f | 698 | SET_NETDEV_DEV(netdev, &chan->conn->hcon->hdev->dev); |
18722c24 JR |
699 | SET_NETDEV_DEVTYPE(netdev, &bt_type); |
700 | ||
2e4d60cb | 701 | *dev = lowpan_btle_dev(netdev); |
5857d1db AA |
702 | (*dev)->netdev = netdev; |
703 | (*dev)->hdev = chan->conn->hcon->hdev; | |
704 | INIT_LIST_HEAD(&(*dev)->peers); | |
705 | ||
706 | spin_lock(&devices_lock); | |
707 | INIT_LIST_HEAD(&(*dev)->list); | |
708 | list_add_rcu(&(*dev)->list, &bt_6lowpan_devices); | |
709 | spin_unlock(&devices_lock); | |
710 | ||
00f59314 | 711 | err = lowpan_register_netdev(netdev, LOWPAN_LLTYPE_BTLE); |
18722c24 JR |
712 | if (err < 0) { |
713 | BT_INFO("register_netdev failed %d", err); | |
5857d1db AA |
714 | spin_lock(&devices_lock); |
715 | list_del_rcu(&(*dev)->list); | |
716 | spin_unlock(&devices_lock); | |
18722c24 JR |
717 | free_netdev(netdev); |
718 | goto out; | |
719 | } | |
720 | ||
6b8d4a6a JR |
721 | BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d", |
722 | netdev->ifindex, &chan->dst, chan->dst_type, | |
723 | &chan->src, chan->src_type); | |
18722c24 JR |
724 | set_bit(__LINK_STATE_PRESENT, &netdev->state); |
725 | ||
6b8d4a6a | 726 | return 0; |
18722c24 JR |
727 | |
728 | out: | |
729 | return err; | |
730 | } | |
731 | ||
6b8d4a6a JR |
732 | static inline void chan_ready_cb(struct l2cap_chan *chan) |
733 | { | |
2e4d60cb | 734 | struct lowpan_btle_dev *dev; |
d2891c4d | 735 | bool new_netdev = false; |
6b8d4a6a JR |
736 | |
737 | dev = lookup_dev(chan->conn); | |
738 | ||
739 | BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev); | |
740 | ||
741 | if (!dev) { | |
742 | if (setup_netdev(chan, &dev) < 0) { | |
743 | l2cap_chan_del(chan, -ENOENT); | |
744 | return; | |
745 | } | |
d2891c4d | 746 | new_netdev = true; |
6b8d4a6a JR |
747 | } |
748 | ||
18d93c17 JR |
749 | if (!try_module_get(THIS_MODULE)) |
750 | return; | |
751 | ||
d2891c4d | 752 | add_peer_chan(chan, dev, new_netdev); |
6b8d4a6a JR |
753 | ifup(dev->netdev); |
754 | } | |
755 | ||
2b293490 | 756 | static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan) |
6b8d4a6a | 757 | { |
2b293490 | 758 | struct l2cap_chan *chan; |
6b8d4a6a | 759 | |
630ef791 JH |
760 | chan = chan_create(); |
761 | if (!chan) | |
762 | return NULL; | |
763 | ||
2b293490 | 764 | chan->ops = pchan->ops; |
6b8d4a6a JR |
765 | |
766 | BT_DBG("chan %p pchan %p", chan, pchan); | |
767 | ||
2b293490 | 768 | return chan; |
6b8d4a6a JR |
769 | } |
770 | ||
18722c24 JR |
771 | static void delete_netdev(struct work_struct *work) |
772 | { | |
2e4d60cb AA |
773 | struct lowpan_btle_dev *entry = container_of(work, |
774 | struct lowpan_btle_dev, | |
775 | delete_netdev); | |
18722c24 | 776 | |
00f59314 | 777 | lowpan_unregister_netdev(entry->netdev); |
18722c24 | 778 | |
2ad88fb2 | 779 | /* The entry pointer is deleted by the netdev destructor. */ |
18722c24 JR |
780 | } |
781 | ||
6b8d4a6a | 782 | static void chan_close_cb(struct l2cap_chan *chan) |
18722c24 | 783 | { |
2e4d60cb AA |
784 | struct lowpan_btle_dev *entry; |
785 | struct lowpan_btle_dev *dev = NULL; | |
18722c24 JR |
786 | struct lowpan_peer *peer; |
787 | int err = -ENOENT; | |
f63666d2 | 788 | bool last = false, remove = true; |
18722c24 | 789 | |
6b8d4a6a JR |
790 | BT_DBG("chan %p conn %p", chan, chan->conn); |
791 | ||
792 | if (chan->conn && chan->conn->hcon) { | |
793 | if (!is_bt_6lowpan(chan->conn->hcon)) | |
794 | return; | |
795 | ||
796 | /* If conn is set, then the netdev is also there and we should | |
797 | * not remove it. | |
798 | */ | |
f63666d2 | 799 | remove = false; |
6b8d4a6a | 800 | } |
18722c24 | 801 | |
90305829 | 802 | spin_lock(&devices_lock); |
18722c24 | 803 | |
90305829 | 804 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
2e4d60cb | 805 | dev = lowpan_btle_dev(entry->netdev); |
90305829 | 806 | peer = __peer_lookup_chan(dev, chan); |
18722c24 JR |
807 | if (peer) { |
808 | last = peer_del(dev, peer); | |
809 | err = 0; | |
6b8d4a6a JR |
810 | |
811 | BT_DBG("dev %p removing %speer %p", dev, | |
812 | last ? "last " : "1 ", peer); | |
813 | BT_DBG("chan %p orig refcnt %d", chan, | |
2c935bc5 | 814 | kref_read(&chan->kref)); |
6b8d4a6a JR |
815 | |
816 | l2cap_chan_put(chan); | |
18722c24 JR |
817 | break; |
818 | } | |
819 | } | |
820 | ||
821 | if (!err && last && dev && !atomic_read(&dev->peer_count)) { | |
90305829 | 822 | spin_unlock(&devices_lock); |
18722c24 JR |
823 | |
824 | cancel_delayed_work_sync(&dev->notify_peers); | |
825 | ||
7f118253 JR |
826 | ifdown(dev->netdev); |
827 | ||
f63666d2 | 828 | if (remove) { |
6b8d4a6a JR |
829 | INIT_WORK(&entry->delete_netdev, delete_netdev); |
830 | schedule_work(&entry->delete_netdev); | |
831 | } | |
18722c24 | 832 | } else { |
90305829 | 833 | spin_unlock(&devices_lock); |
18722c24 JR |
834 | } |
835 | ||
6b8d4a6a JR |
836 | return; |
837 | } | |
838 | ||
839 | static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err) | |
840 | { | |
841 | BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn, | |
842 | state_to_string(state), err); | |
843 | } | |
844 | ||
845 | static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan, | |
846 | unsigned long hdr_len, | |
847 | unsigned long len, int nb) | |
848 | { | |
849 | /* Note that we must allocate using GFP_ATOMIC here as | |
850 | * this function is called originally from netdev hard xmit | |
851 | * function in atomic context. | |
852 | */ | |
853 | return bt_skb_alloc(hdr_len + len, GFP_ATOMIC); | |
854 | } | |
855 | ||
856 | static void chan_suspend_cb(struct l2cap_chan *chan) | |
857 | { | |
f183e52b LAD |
858 | struct lowpan_btle_dev *dev; |
859 | ||
6dea44f5 | 860 | BT_DBG("chan %p suspend", chan); |
f183e52b LAD |
861 | |
862 | dev = lookup_dev(chan->conn); | |
863 | if (!dev || !dev->netdev) | |
864 | return; | |
865 | ||
866 | netif_stop_queue(dev->netdev); | |
6b8d4a6a JR |
867 | } |
868 | ||
869 | static void chan_resume_cb(struct l2cap_chan *chan) | |
870 | { | |
f183e52b LAD |
871 | struct lowpan_btle_dev *dev; |
872 | ||
6dea44f5 | 873 | BT_DBG("chan %p resume", chan); |
f183e52b LAD |
874 | |
875 | dev = lookup_dev(chan->conn); | |
876 | if (!dev || !dev->netdev) | |
877 | return; | |
878 | ||
879 | netif_wake_queue(dev->netdev); | |
6b8d4a6a JR |
880 | } |
881 | ||
882 | static long chan_get_sndtimeo_cb(struct l2cap_chan *chan) | |
883 | { | |
2ae50d8d | 884 | return L2CAP_CONN_TIMEOUT; |
6b8d4a6a JR |
885 | } |
886 | ||
887 | static const struct l2cap_ops bt_6lowpan_chan_ops = { | |
888 | .name = "L2CAP 6LoWPAN channel", | |
889 | .new_connection = chan_new_conn_cb, | |
890 | .recv = chan_recv_cb, | |
891 | .close = chan_close_cb, | |
892 | .state_change = chan_state_change_cb, | |
893 | .ready = chan_ready_cb, | |
894 | .resume = chan_resume_cb, | |
895 | .suspend = chan_suspend_cb, | |
896 | .get_sndtimeo = chan_get_sndtimeo_cb, | |
897 | .alloc_skb = chan_alloc_skb_cb, | |
6b8d4a6a JR |
898 | |
899 | .teardown = l2cap_chan_no_teardown, | |
900 | .defer = l2cap_chan_no_defer, | |
901 | .set_shutdown = l2cap_chan_no_set_shutdown, | |
902 | }; | |
903 | ||
904 | static inline __u8 bdaddr_type(__u8 type) | |
905 | { | |
906 | if (type == ADDR_LE_DEV_PUBLIC) | |
907 | return BDADDR_LE_PUBLIC; | |
908 | else | |
909 | return BDADDR_LE_RANDOM; | |
910 | } | |
911 | ||
6b8d4a6a JR |
912 | static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type) |
913 | { | |
0cd088fc | 914 | struct l2cap_chan *chan; |
6b8d4a6a JR |
915 | int err; |
916 | ||
26d46dff | 917 | chan = chan_create(); |
0cd088fc | 918 | if (!chan) |
6b8d4a6a JR |
919 | return -EINVAL; |
920 | ||
26d46dff JH |
921 | chan->ops = &bt_6lowpan_chan_ops; |
922 | ||
0cd088fc | 923 | err = l2cap_chan_connect(chan, cpu_to_le16(L2CAP_PSM_IPSP), 0, |
6b8d4a6a JR |
924 | addr, dst_type); |
925 | ||
0cd088fc | 926 | BT_DBG("chan %p err %d", chan, err); |
6b8d4a6a | 927 | if (err < 0) |
0cd088fc | 928 | l2cap_chan_put(chan); |
6b8d4a6a | 929 | |
18722c24 JR |
930 | return err; |
931 | } | |
932 | ||
6b8d4a6a JR |
933 | static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type) |
934 | { | |
935 | struct lowpan_peer *peer; | |
936 | ||
937 | BT_DBG("conn %p dst type %d", conn, dst_type); | |
938 | ||
939 | peer = lookup_peer(conn); | |
940 | if (!peer) | |
941 | return -ENOENT; | |
942 | ||
943 | BT_DBG("peer %p chan %p", peer, peer->chan); | |
944 | ||
945 | l2cap_chan_close(peer->chan, ENOENT); | |
946 | ||
947 | return 0; | |
948 | } | |
949 | ||
950 | static struct l2cap_chan *bt_6lowpan_listen(void) | |
951 | { | |
952 | bdaddr_t *addr = BDADDR_ANY; | |
0cd088fc | 953 | struct l2cap_chan *chan; |
6b8d4a6a JR |
954 | int err; |
955 | ||
7b2ed60e | 956 | if (!enable_6lowpan) |
6b8d4a6a JR |
957 | return NULL; |
958 | ||
26d46dff | 959 | chan = chan_create(); |
0cd088fc | 960 | if (!chan) |
6b8d4a6a JR |
961 | return NULL; |
962 | ||
26d46dff | 963 | chan->ops = &bt_6lowpan_chan_ops; |
0cd088fc JH |
964 | chan->state = BT_LISTEN; |
965 | chan->src_type = BDADDR_LE_PUBLIC; | |
6b8d4a6a | 966 | |
0cd088fc | 967 | atomic_set(&chan->nesting, L2CAP_NESTING_PARENT); |
2773b024 | 968 | |
0cd088fc | 969 | BT_DBG("chan %p src type %d", chan, chan->src_type); |
6b8d4a6a | 970 | |
0cd088fc | 971 | err = l2cap_add_psm(chan, addr, cpu_to_le16(L2CAP_PSM_IPSP)); |
6b8d4a6a | 972 | if (err) { |
0cd088fc | 973 | l2cap_chan_put(chan); |
6b8d4a6a JR |
974 | BT_ERR("psm cannot be added err %d", err); |
975 | return NULL; | |
976 | } | |
977 | ||
0cd088fc | 978 | return chan; |
6b8d4a6a JR |
979 | } |
980 | ||
981 | static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type, | |
982 | struct l2cap_conn **conn) | |
983 | { | |
984 | struct hci_conn *hcon; | |
985 | struct hci_dev *hdev; | |
6b8d4a6a JR |
986 | int n; |
987 | ||
988 | n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu", | |
989 | &addr->b[5], &addr->b[4], &addr->b[3], | |
990 | &addr->b[2], &addr->b[1], &addr->b[0], | |
991 | addr_type); | |
992 | ||
993 | if (n < 7) | |
994 | return -EINVAL; | |
995 | ||
39385cb5 JH |
996 | /* The LE_PUBLIC address type is ignored because of BDADDR_ANY */ |
997 | hdev = hci_get_route(addr, BDADDR_ANY, BDADDR_LE_PUBLIC); | |
6b8d4a6a JR |
998 | if (!hdev) |
999 | return -ENOENT; | |
1000 | ||
1001 | hci_dev_lock(hdev); | |
f5ad4ffc | 1002 | hcon = hci_conn_hash_lookup_le(hdev, addr, *addr_type); |
6b8d4a6a JR |
1003 | hci_dev_unlock(hdev); |
1004 | ||
1005 | if (!hcon) | |
1006 | return -ENOENT; | |
1007 | ||
1008 | *conn = (struct l2cap_conn *)hcon->l2cap_data; | |
1009 | ||
1010 | BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type); | |
1011 | ||
1012 | return 0; | |
1013 | } | |
1014 | ||
1015 | static void disconnect_all_peers(void) | |
1016 | { | |
2e4d60cb | 1017 | struct lowpan_btle_dev *entry; |
6b8d4a6a JR |
1018 | struct lowpan_peer *peer, *tmp_peer, *new_peer; |
1019 | struct list_head peers; | |
6b8d4a6a JR |
1020 | |
1021 | INIT_LIST_HEAD(&peers); | |
1022 | ||
1023 | /* We make a separate list of peers as the close_cb() will | |
1024 | * modify the device peers list so it is better not to mess | |
1025 | * with the same list at the same time. | |
1026 | */ | |
1027 | ||
90305829 | 1028 | rcu_read_lock(); |
6b8d4a6a | 1029 | |
90305829 JR |
1030 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
1031 | list_for_each_entry_rcu(peer, &entry->peers, list) { | |
6b8d4a6a JR |
1032 | new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC); |
1033 | if (!new_peer) | |
1034 | break; | |
1035 | ||
1036 | new_peer->chan = peer->chan; | |
1037 | INIT_LIST_HEAD(&new_peer->list); | |
1038 | ||
1039 | list_add(&new_peer->list, &peers); | |
1040 | } | |
1041 | } | |
1042 | ||
90305829 | 1043 | rcu_read_unlock(); |
6b8d4a6a | 1044 | |
90305829 | 1045 | spin_lock(&devices_lock); |
6b8d4a6a JR |
1046 | list_for_each_entry_safe(peer, tmp_peer, &peers, list) { |
1047 | l2cap_chan_close(peer->chan, ENOENT); | |
90305829 JR |
1048 | |
1049 | list_del_rcu(&peer->list); | |
4e790226 | 1050 | kfree_rcu(peer, rcu); |
6b8d4a6a | 1051 | } |
90305829 | 1052 | spin_unlock(&devices_lock); |
6b8d4a6a JR |
1053 | } |
1054 | ||
7b2ed60e | 1055 | struct set_enable { |
90305829 | 1056 | struct work_struct work; |
7b2ed60e | 1057 | bool flag; |
90305829 | 1058 | }; |
6b8d4a6a | 1059 | |
7b2ed60e | 1060 | static void do_enable_set(struct work_struct *work) |
90305829 | 1061 | { |
7b2ed60e JR |
1062 | struct set_enable *set_enable = container_of(work, |
1063 | struct set_enable, work); | |
90305829 | 1064 | |
7b2ed60e | 1065 | if (!set_enable->flag || enable_6lowpan != set_enable->flag) |
6b8d4a6a | 1066 | /* Disconnect existing connections if 6lowpan is |
7b2ed60e | 1067 | * disabled |
6b8d4a6a JR |
1068 | */ |
1069 | disconnect_all_peers(); | |
1070 | ||
7b2ed60e | 1071 | enable_6lowpan = set_enable->flag; |
6b8d4a6a JR |
1072 | |
1073 | if (listen_chan) { | |
1074 | l2cap_chan_close(listen_chan, 0); | |
1075 | l2cap_chan_put(listen_chan); | |
1076 | } | |
1077 | ||
1078 | listen_chan = bt_6lowpan_listen(); | |
1079 | ||
7b2ed60e | 1080 | kfree(set_enable); |
90305829 JR |
1081 | } |
1082 | ||
7b2ed60e | 1083 | static int lowpan_enable_set(void *data, u64 val) |
90305829 | 1084 | { |
7b2ed60e | 1085 | struct set_enable *set_enable; |
90305829 | 1086 | |
7b2ed60e JR |
1087 | set_enable = kzalloc(sizeof(*set_enable), GFP_KERNEL); |
1088 | if (!set_enable) | |
90305829 JR |
1089 | return -ENOMEM; |
1090 | ||
7b2ed60e JR |
1091 | set_enable->flag = !!val; |
1092 | INIT_WORK(&set_enable->work, do_enable_set); | |
90305829 | 1093 | |
7b2ed60e | 1094 | schedule_work(&set_enable->work); |
90305829 | 1095 | |
6b8d4a6a JR |
1096 | return 0; |
1097 | } | |
1098 | ||
7b2ed60e | 1099 | static int lowpan_enable_get(void *data, u64 *val) |
6b8d4a6a | 1100 | { |
7b2ed60e | 1101 | *val = enable_6lowpan; |
6b8d4a6a JR |
1102 | return 0; |
1103 | } | |
1104 | ||
e250fab6 Y |
1105 | DEFINE_DEBUGFS_ATTRIBUTE(lowpan_enable_fops, lowpan_enable_get, |
1106 | lowpan_enable_set, "%llu\n"); | |
6b8d4a6a JR |
1107 | |
1108 | static ssize_t lowpan_control_write(struct file *fp, | |
1109 | const char __user *user_buffer, | |
1110 | size_t count, | |
1111 | loff_t *position) | |
1112 | { | |
1113 | char buf[32]; | |
1114 | size_t buf_size = min(count, sizeof(buf) - 1); | |
1115 | int ret; | |
1116 | bdaddr_t addr; | |
1117 | u8 addr_type; | |
1118 | struct l2cap_conn *conn = NULL; | |
1119 | ||
1120 | if (copy_from_user(buf, user_buffer, buf_size)) | |
1121 | return -EFAULT; | |
1122 | ||
1123 | buf[buf_size] = '\0'; | |
1124 | ||
1125 | if (memcmp(buf, "connect ", 8) == 0) { | |
1126 | ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn); | |
1127 | if (ret == -EINVAL) | |
1128 | return ret; | |
1129 | ||
1130 | if (listen_chan) { | |
1131 | l2cap_chan_close(listen_chan, 0); | |
1132 | l2cap_chan_put(listen_chan); | |
1133 | listen_chan = NULL; | |
1134 | } | |
1135 | ||
1136 | if (conn) { | |
1137 | struct lowpan_peer *peer; | |
1138 | ||
1139 | if (!is_bt_6lowpan(conn->hcon)) | |
1140 | return -EINVAL; | |
1141 | ||
1142 | peer = lookup_peer(conn); | |
1143 | if (peer) { | |
1144 | BT_DBG("6LoWPAN connection already exists"); | |
1145 | return -EALREADY; | |
1146 | } | |
1147 | ||
1148 | BT_DBG("conn %p dst %pMR type %d user %d", conn, | |
1149 | &conn->hcon->dst, conn->hcon->dst_type, | |
1150 | addr_type); | |
1151 | } | |
1152 | ||
1153 | ret = bt_6lowpan_connect(&addr, addr_type); | |
1154 | if (ret < 0) | |
1155 | return ret; | |
1156 | ||
1157 | return count; | |
1158 | } | |
1159 | ||
1160 | if (memcmp(buf, "disconnect ", 11) == 0) { | |
1161 | ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn); | |
1162 | if (ret < 0) | |
1163 | return ret; | |
1164 | ||
1165 | ret = bt_6lowpan_disconnect(conn, addr_type); | |
1166 | if (ret < 0) | |
1167 | return ret; | |
1168 | ||
1169 | return count; | |
1170 | } | |
1171 | ||
1172 | return count; | |
1173 | } | |
1174 | ||
1175 | static int lowpan_control_show(struct seq_file *f, void *ptr) | |
1176 | { | |
2e4d60cb | 1177 | struct lowpan_btle_dev *entry; |
90305829 | 1178 | struct lowpan_peer *peer; |
6b8d4a6a | 1179 | |
90305829 | 1180 | spin_lock(&devices_lock); |
6b8d4a6a | 1181 | |
90305829 JR |
1182 | list_for_each_entry(entry, &bt_6lowpan_devices, list) { |
1183 | list_for_each_entry(peer, &entry->peers, list) | |
6b8d4a6a JR |
1184 | seq_printf(f, "%pMR (type %u)\n", |
1185 | &peer->chan->dst, peer->chan->dst_type); | |
1186 | } | |
1187 | ||
90305829 | 1188 | spin_unlock(&devices_lock); |
6b8d4a6a JR |
1189 | |
1190 | return 0; | |
1191 | } | |
1192 | ||
1193 | static int lowpan_control_open(struct inode *inode, struct file *file) | |
1194 | { | |
1195 | return single_open(file, lowpan_control_show, inode->i_private); | |
1196 | } | |
1197 | ||
1198 | static const struct file_operations lowpan_control_fops = { | |
1199 | .open = lowpan_control_open, | |
1200 | .read = seq_read, | |
1201 | .write = lowpan_control_write, | |
1202 | .llseek = seq_lseek, | |
1203 | .release = single_release, | |
1204 | }; | |
1205 | ||
7f118253 JR |
1206 | static void disconnect_devices(void) |
1207 | { | |
2e4d60cb | 1208 | struct lowpan_btle_dev *entry, *tmp, *new_dev; |
7f118253 | 1209 | struct list_head devices; |
7f118253 JR |
1210 | |
1211 | INIT_LIST_HEAD(&devices); | |
1212 | ||
1213 | /* We make a separate list of devices because the unregister_netdev() | |
1214 | * will call device_event() which will also want to modify the same | |
1215 | * devices list. | |
1216 | */ | |
1217 | ||
90305829 | 1218 | rcu_read_lock(); |
7f118253 | 1219 | |
90305829 | 1220 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
7f118253 JR |
1221 | new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC); |
1222 | if (!new_dev) | |
1223 | break; | |
1224 | ||
1225 | new_dev->netdev = entry->netdev; | |
1226 | INIT_LIST_HEAD(&new_dev->list); | |
1227 | ||
90305829 | 1228 | list_add_rcu(&new_dev->list, &devices); |
7f118253 JR |
1229 | } |
1230 | ||
90305829 | 1231 | rcu_read_unlock(); |
7f118253 | 1232 | |
daac197c | 1233 | list_for_each_entry_safe(entry, tmp, &devices, list) { |
7f118253 JR |
1234 | ifdown(entry->netdev); |
1235 | BT_DBG("Unregistering netdev %s %p", | |
1236 | entry->netdev->name, entry->netdev); | |
00f59314 | 1237 | lowpan_unregister_netdev(entry->netdev); |
7f118253 JR |
1238 | kfree(entry); |
1239 | } | |
1240 | } | |
1241 | ||
18722c24 JR |
1242 | static int device_event(struct notifier_block *unused, |
1243 | unsigned long event, void *ptr) | |
1244 | { | |
1245 | struct net_device *netdev = netdev_notifier_info_to_dev(ptr); | |
2e4d60cb | 1246 | struct lowpan_btle_dev *entry; |
18722c24 JR |
1247 | |
1248 | if (netdev->type != ARPHRD_6LOWPAN) | |
1249 | return NOTIFY_DONE; | |
1250 | ||
1251 | switch (event) { | |
1252 | case NETDEV_UNREGISTER: | |
90305829 JR |
1253 | spin_lock(&devices_lock); |
1254 | list_for_each_entry(entry, &bt_6lowpan_devices, list) { | |
18722c24 | 1255 | if (entry->netdev == netdev) { |
7f118253 JR |
1256 | BT_DBG("Unregistered netdev %s %p", |
1257 | netdev->name, netdev); | |
18722c24 | 1258 | list_del(&entry->list); |
18722c24 JR |
1259 | break; |
1260 | } | |
1261 | } | |
90305829 | 1262 | spin_unlock(&devices_lock); |
18722c24 JR |
1263 | break; |
1264 | } | |
1265 | ||
1266 | return NOTIFY_DONE; | |
1267 | } | |
1268 | ||
1269 | static struct notifier_block bt_6lowpan_dev_notifier = { | |
1270 | .notifier_call = device_event, | |
1271 | }; | |
1272 | ||
5547e48c | 1273 | static int __init bt_6lowpan_init(void) |
18722c24 | 1274 | { |
e250fab6 Y |
1275 | lowpan_enable_debugfs = debugfs_create_file_unsafe("6lowpan_enable", |
1276 | 0644, bt_debugfs, | |
1277 | NULL, | |
1278 | &lowpan_enable_fops); | |
6b8d4a6a JR |
1279 | lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644, |
1280 | bt_debugfs, NULL, | |
1281 | &lowpan_control_fops); | |
1282 | ||
18722c24 JR |
1283 | return register_netdevice_notifier(&bt_6lowpan_dev_notifier); |
1284 | } | |
1285 | ||
5547e48c | 1286 | static void __exit bt_6lowpan_exit(void) |
18722c24 | 1287 | { |
7b2ed60e | 1288 | debugfs_remove(lowpan_enable_debugfs); |
6b8d4a6a JR |
1289 | debugfs_remove(lowpan_control_debugfs); |
1290 | ||
1291 | if (listen_chan) { | |
1292 | l2cap_chan_close(listen_chan, 0); | |
1293 | l2cap_chan_put(listen_chan); | |
1294 | } | |
1295 | ||
7f118253 JR |
1296 | disconnect_devices(); |
1297 | ||
18722c24 JR |
1298 | unregister_netdevice_notifier(&bt_6lowpan_dev_notifier); |
1299 | } | |
5547e48c JR |
1300 | |
1301 | module_init(bt_6lowpan_init); | |
1302 | module_exit(bt_6lowpan_exit); | |
1303 | ||
1304 | MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>"); | |
1305 | MODULE_DESCRIPTION("Bluetooth 6LoWPAN"); | |
1306 | MODULE_VERSION(VERSION); | |
1307 | MODULE_LICENSE("GPL"); |