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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> | |
23 | ||
18722c24 JR |
24 | #include <net/bluetooth/bluetooth.h> |
25 | #include <net/bluetooth/hci_core.h> | |
26 | #include <net/bluetooth/l2cap.h> | |
27 | ||
cefc8c8a | 28 | #include <net/6lowpan.h> /* for the compression support */ |
18722c24 | 29 | |
6b8d4a6a JR |
30 | #define VERSION "0.1" |
31 | ||
7b2ed60e | 32 | static struct dentry *lowpan_enable_debugfs; |
6b8d4a6a JR |
33 | static struct dentry *lowpan_control_debugfs; |
34 | ||
18722c24 | 35 | #define IFACE_NAME_TEMPLATE "bt%d" |
18722c24 JR |
36 | |
37 | struct skb_cb { | |
38 | struct in6_addr addr; | |
39e90c77 | 39 | struct in6_addr gw; |
6b8d4a6a JR |
40 | struct l2cap_chan *chan; |
41 | int status; | |
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 */ | |
67 | unsigned char eui64_addr[EUI64_ADDR_LEN]; | |
68 | struct in6_addr peer_addr; | |
69 | }; | |
70 | ||
71 | struct lowpan_dev { | |
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 | ||
83 | static inline struct lowpan_dev *lowpan_dev(const struct net_device *netdev) | |
84 | { | |
b72f6f51 | 85 | return (struct lowpan_dev *)lowpan_priv(netdev)->priv; |
18722c24 JR |
86 | } |
87 | ||
88 | static inline void peer_add(struct lowpan_dev *dev, struct lowpan_peer *peer) | |
89 | { | |
90305829 | 90 | list_add_rcu(&peer->list, &dev->peers); |
18722c24 JR |
91 | atomic_inc(&dev->peer_count); |
92 | } | |
93 | ||
94 | static inline bool peer_del(struct lowpan_dev *dev, struct lowpan_peer *peer) | |
95 | { | |
90305829 | 96 | list_del_rcu(&peer->list); |
4e790226 | 97 | kfree_rcu(peer, rcu); |
18722c24 | 98 | |
18d93c17 JR |
99 | module_put(THIS_MODULE); |
100 | ||
18722c24 JR |
101 | if (atomic_dec_and_test(&dev->peer_count)) { |
102 | BT_DBG("last peer"); | |
103 | return true; | |
104 | } | |
105 | ||
106 | return false; | |
107 | } | |
108 | ||
109 | static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_dev *dev, | |
110 | bdaddr_t *ba, __u8 type) | |
111 | { | |
90305829 | 112 | struct lowpan_peer *peer; |
18722c24 JR |
113 | |
114 | BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count), | |
115 | ba, type); | |
116 | ||
90305829 JR |
117 | rcu_read_lock(); |
118 | ||
119 | list_for_each_entry_rcu(peer, &dev->peers, list) { | |
6b8d4a6a JR |
120 | BT_DBG("dst addr %pMR dst type %d", |
121 | &peer->chan->dst, peer->chan->dst_type); | |
18722c24 | 122 | |
6b8d4a6a | 123 | if (bacmp(&peer->chan->dst, ba)) |
18722c24 JR |
124 | continue; |
125 | ||
90305829 JR |
126 | if (type == peer->chan->dst_type) { |
127 | rcu_read_unlock(); | |
6b8d4a6a | 128 | return peer; |
90305829 | 129 | } |
6b8d4a6a JR |
130 | } |
131 | ||
90305829 JR |
132 | rcu_read_unlock(); |
133 | ||
6b8d4a6a JR |
134 | return NULL; |
135 | } | |
136 | ||
90305829 JR |
137 | static inline struct lowpan_peer *__peer_lookup_chan(struct lowpan_dev *dev, |
138 | struct l2cap_chan *chan) | |
6b8d4a6a | 139 | { |
90305829 | 140 | struct lowpan_peer *peer; |
6b8d4a6a | 141 | |
90305829 | 142 | list_for_each_entry_rcu(peer, &dev->peers, list) { |
6b8d4a6a | 143 | if (peer->chan == chan) |
18722c24 JR |
144 | return peer; |
145 | } | |
146 | ||
147 | return NULL; | |
148 | } | |
149 | ||
90305829 JR |
150 | static inline struct lowpan_peer *__peer_lookup_conn(struct lowpan_dev *dev, |
151 | struct l2cap_conn *conn) | |
18722c24 | 152 | { |
90305829 | 153 | struct lowpan_peer *peer; |
18722c24 | 154 | |
90305829 | 155 | list_for_each_entry_rcu(peer, &dev->peers, list) { |
6b8d4a6a | 156 | if (peer->chan->conn == conn) |
18722c24 JR |
157 | return peer; |
158 | } | |
159 | ||
160 | return NULL; | |
161 | } | |
162 | ||
39e90c77 JR |
163 | static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_dev *dev, |
164 | struct in6_addr *daddr, | |
165 | struct sk_buff *skb) | |
166 | { | |
90305829 | 167 | struct lowpan_peer *peer; |
39e90c77 JR |
168 | struct in6_addr *nexthop; |
169 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); | |
170 | int count = atomic_read(&dev->peer_count); | |
171 | ||
172 | BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt); | |
173 | ||
174 | /* If we have multiple 6lowpan peers, then check where we should | |
175 | * send the packet. If only one peer exists, then we can send the | |
176 | * packet right away. | |
177 | */ | |
90305829 JR |
178 | if (count == 1) { |
179 | rcu_read_lock(); | |
180 | peer = list_first_or_null_rcu(&dev->peers, struct lowpan_peer, | |
181 | list); | |
182 | rcu_read_unlock(); | |
183 | return peer; | |
184 | } | |
39e90c77 JR |
185 | |
186 | if (!rt) { | |
187 | nexthop = &lowpan_cb(skb)->gw; | |
188 | ||
189 | if (ipv6_addr_any(nexthop)) | |
190 | return NULL; | |
191 | } else { | |
2647a9b0 | 192 | nexthop = rt6_nexthop(rt, daddr); |
39e90c77 JR |
193 | |
194 | /* We need to remember the address because it is needed | |
195 | * by bt_xmit() when sending the packet. In bt_xmit(), the | |
196 | * destination routing info is not set. | |
197 | */ | |
198 | memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr)); | |
199 | } | |
200 | ||
201 | BT_DBG("gw %pI6c", nexthop); | |
202 | ||
90305829 JR |
203 | rcu_read_lock(); |
204 | ||
205 | list_for_each_entry_rcu(peer, &dev->peers, list) { | |
39e90c77 JR |
206 | BT_DBG("dst addr %pMR dst type %d ip %pI6c", |
207 | &peer->chan->dst, peer->chan->dst_type, | |
208 | &peer->peer_addr); | |
209 | ||
90305829 JR |
210 | if (!ipv6_addr_cmp(&peer->peer_addr, nexthop)) { |
211 | rcu_read_unlock(); | |
39e90c77 | 212 | return peer; |
90305829 | 213 | } |
39e90c77 JR |
214 | } |
215 | ||
90305829 JR |
216 | rcu_read_unlock(); |
217 | ||
39e90c77 JR |
218 | return NULL; |
219 | } | |
220 | ||
18722c24 JR |
221 | static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn) |
222 | { | |
90305829 | 223 | struct lowpan_dev *entry; |
18722c24 | 224 | struct lowpan_peer *peer = NULL; |
18722c24 | 225 | |
90305829 | 226 | rcu_read_lock(); |
18722c24 | 227 | |
90305829 JR |
228 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
229 | peer = __peer_lookup_conn(entry, conn); | |
18722c24 JR |
230 | if (peer) |
231 | break; | |
232 | } | |
233 | ||
90305829 | 234 | rcu_read_unlock(); |
18722c24 JR |
235 | |
236 | return peer; | |
237 | } | |
238 | ||
239 | static struct lowpan_dev *lookup_dev(struct l2cap_conn *conn) | |
240 | { | |
90305829 | 241 | struct lowpan_dev *entry; |
18722c24 | 242 | struct lowpan_dev *dev = NULL; |
18722c24 | 243 | |
90305829 | 244 | rcu_read_lock(); |
18722c24 | 245 | |
90305829 | 246 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
18722c24 JR |
247 | if (conn->hcon->hdev == entry->hdev) { |
248 | dev = entry; | |
249 | break; | |
250 | } | |
251 | } | |
252 | ||
90305829 | 253 | rcu_read_unlock(); |
18722c24 JR |
254 | |
255 | return dev; | |
256 | } | |
257 | ||
18722c24 JR |
258 | static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev) |
259 | { | |
260 | struct sk_buff *skb_cp; | |
18722c24 JR |
261 | |
262 | skb_cp = skb_copy(skb, GFP_ATOMIC); | |
263 | if (!skb_cp) | |
f8b36176 | 264 | return NET_RX_DROP; |
18722c24 | 265 | |
324e786e | 266 | return netif_rx_ni(skb_cp); |
18722c24 JR |
267 | } |
268 | ||
01141234 MT |
269 | static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev, |
270 | struct l2cap_chan *chan) | |
18722c24 JR |
271 | { |
272 | const u8 *saddr, *daddr; | |
18722c24 JR |
273 | struct lowpan_dev *dev; |
274 | struct lowpan_peer *peer; | |
18722c24 JR |
275 | |
276 | dev = lowpan_dev(netdev); | |
277 | ||
90305829 JR |
278 | rcu_read_lock(); |
279 | peer = __peer_lookup_chan(dev, chan); | |
280 | rcu_read_unlock(); | |
18722c24 | 281 | if (!peer) |
56b2c3ee | 282 | return -EINVAL; |
18722c24 JR |
283 | |
284 | saddr = peer->eui64_addr; | |
285 | daddr = dev->netdev->dev_addr; | |
286 | ||
8911d774 | 287 | return lowpan_header_decompress(skb, netdev, daddr, saddr); |
18722c24 JR |
288 | } |
289 | ||
290 | static int recv_pkt(struct sk_buff *skb, struct net_device *dev, | |
6b8d4a6a | 291 | struct l2cap_chan *chan) |
18722c24 JR |
292 | { |
293 | struct sk_buff *local_skb; | |
294 | int ret; | |
295 | ||
296 | if (!netif_running(dev)) | |
297 | goto drop; | |
298 | ||
cefdb801 | 299 | if (dev->type != ARPHRD_6LOWPAN || !skb->len) |
18722c24 JR |
300 | goto drop; |
301 | ||
cefdb801 AA |
302 | skb_reset_network_header(skb); |
303 | ||
11e3ff70 MT |
304 | skb = skb_share_check(skb, GFP_ATOMIC); |
305 | if (!skb) | |
306 | goto drop; | |
307 | ||
18722c24 | 308 | /* check that it's our buffer */ |
cefdb801 | 309 | if (lowpan_is_ipv6(*skb_network_header(skb))) { |
18722c24 JR |
310 | /* Copy the packet so that the IPv6 header is |
311 | * properly aligned. | |
312 | */ | |
313 | local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1, | |
314 | skb_tailroom(skb), GFP_ATOMIC); | |
315 | if (!local_skb) | |
316 | goto drop; | |
317 | ||
318 | local_skb->protocol = htons(ETH_P_IPV6); | |
319 | local_skb->pkt_type = PACKET_HOST; | |
320 | ||
18722c24 JR |
321 | skb_set_transport_header(local_skb, sizeof(struct ipv6hdr)); |
322 | ||
323 | if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) { | |
324 | kfree_skb(local_skb); | |
325 | goto drop; | |
326 | } | |
327 | ||
328 | dev->stats.rx_bytes += skb->len; | |
329 | dev->stats.rx_packets++; | |
330 | ||
3c400b84 MT |
331 | consume_skb(local_skb); |
332 | consume_skb(skb); | |
cefdb801 AA |
333 | } else if (lowpan_is_iphc(*skb_network_header(skb))) { |
334 | local_skb = skb_clone(skb, GFP_ATOMIC); | |
335 | if (!local_skb) | |
336 | goto drop; | |
337 | ||
338 | ret = iphc_decompress(local_skb, dev, chan); | |
339 | if (ret < 0) { | |
340 | kfree_skb(local_skb); | |
341 | goto drop; | |
342 | } | |
343 | ||
344 | local_skb->protocol = htons(ETH_P_IPV6); | |
345 | local_skb->pkt_type = PACKET_HOST; | |
346 | local_skb->dev = dev; | |
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 { | |
360 | goto drop; | |
18722c24 JR |
361 | } |
362 | ||
363 | return NET_RX_SUCCESS; | |
364 | ||
365 | drop: | |
6b8d4a6a | 366 | dev->stats.rx_dropped++; |
18722c24 JR |
367 | return NET_RX_DROP; |
368 | } | |
369 | ||
370 | /* Packet from BT LE device */ | |
6b8d4a6a | 371 | static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
18722c24 JR |
372 | { |
373 | struct lowpan_dev *dev; | |
374 | struct lowpan_peer *peer; | |
375 | int err; | |
376 | ||
6b8d4a6a | 377 | peer = lookup_peer(chan->conn); |
18722c24 JR |
378 | if (!peer) |
379 | return -ENOENT; | |
380 | ||
6b8d4a6a | 381 | dev = lookup_dev(chan->conn); |
30d3db44 | 382 | if (!dev || !dev->netdev) |
18722c24 JR |
383 | return -ENOENT; |
384 | ||
6b8d4a6a JR |
385 | err = recv_pkt(skb, dev->netdev, chan); |
386 | if (err) { | |
387 | BT_DBG("recv pkt %d", err); | |
388 | err = -EAGAIN; | |
18722c24 JR |
389 | } |
390 | ||
6b8d4a6a | 391 | return err; |
18722c24 JR |
392 | } |
393 | ||
62bbd5b3 | 394 | static u8 get_addr_type_from_eui64(u8 byte) |
18722c24 | 395 | { |
6b8d4a6a JR |
396 | /* Is universal(0) or local(1) bit */ |
397 | return ((byte & 0x02) ? BDADDR_LE_RANDOM : BDADDR_LE_PUBLIC); | |
62bbd5b3 JR |
398 | } |
399 | ||
400 | static void copy_to_bdaddr(struct in6_addr *ip6_daddr, bdaddr_t *addr) | |
401 | { | |
402 | u8 *eui64 = ip6_daddr->s6_addr + 8; | |
18722c24 JR |
403 | |
404 | addr->b[0] = eui64[7]; | |
405 | addr->b[1] = eui64[6]; | |
406 | addr->b[2] = eui64[5]; | |
407 | addr->b[3] = eui64[2]; | |
408 | addr->b[4] = eui64[1]; | |
409 | addr->b[5] = eui64[0]; | |
62bbd5b3 | 410 | } |
18722c24 | 411 | |
62bbd5b3 JR |
412 | static void convert_dest_bdaddr(struct in6_addr *ip6_daddr, |
413 | bdaddr_t *addr, u8 *addr_type) | |
414 | { | |
415 | copy_to_bdaddr(ip6_daddr, addr); | |
18722c24 | 416 | |
62bbd5b3 JR |
417 | /* We need to toggle the U/L bit that we got from IPv6 address |
418 | * so that we get the proper address and type of the BD address. | |
419 | */ | |
420 | addr->b[5] ^= 0x02; | |
421 | ||
422 | *addr_type = get_addr_type_from_eui64(addr->b[5]); | |
18722c24 JR |
423 | } |
424 | ||
36b3dd25 JR |
425 | static int setup_header(struct sk_buff *skb, struct net_device *netdev, |
426 | bdaddr_t *peer_addr, u8 *peer_addr_type) | |
18722c24 | 427 | { |
36b3dd25 | 428 | struct in6_addr ipv6_daddr; |
18722c24 JR |
429 | struct lowpan_dev *dev; |
430 | struct lowpan_peer *peer; | |
431 | bdaddr_t addr, *any = BDADDR_ANY; | |
36b3dd25 JR |
432 | u8 *daddr = any->b; |
433 | int err, status = 0; | |
18722c24 JR |
434 | |
435 | dev = lowpan_dev(netdev); | |
436 | ||
36b3dd25 JR |
437 | memcpy(&ipv6_daddr, &lowpan_cb(skb)->addr, sizeof(ipv6_daddr)); |
438 | ||
439 | if (ipv6_addr_is_multicast(&ipv6_daddr)) { | |
6b8d4a6a | 440 | lowpan_cb(skb)->chan = NULL; |
18722c24 | 441 | } else { |
36b3dd25 | 442 | u8 addr_type; |
18722c24 JR |
443 | |
444 | /* Get destination BT device from skb. | |
445 | * If there is no such peer then discard the packet. | |
446 | */ | |
36b3dd25 | 447 | convert_dest_bdaddr(&ipv6_daddr, &addr, &addr_type); |
18722c24 | 448 | |
6b8d4a6a | 449 | BT_DBG("dest addr %pMR type %d IP %pI6c", &addr, |
36b3dd25 | 450 | addr_type, &ipv6_daddr); |
18722c24 | 451 | |
18722c24 | 452 | peer = peer_lookup_ba(dev, &addr, addr_type); |
18722c24 | 453 | if (!peer) { |
39e90c77 JR |
454 | /* The packet might be sent to 6lowpan interface |
455 | * because of routing (either via default route | |
456 | * or user set route) so get peer according to | |
457 | * the destination address. | |
458 | */ | |
36b3dd25 | 459 | peer = peer_lookup_dst(dev, &ipv6_daddr, skb); |
39e90c77 JR |
460 | if (!peer) { |
461 | BT_DBG("no such peer %pMR found", &addr); | |
462 | return -ENOENT; | |
463 | } | |
18722c24 JR |
464 | } |
465 | ||
466 | daddr = peer->eui64_addr; | |
36b3dd25 JR |
467 | *peer_addr = addr; |
468 | *peer_addr_type = addr_type; | |
6b8d4a6a | 469 | lowpan_cb(skb)->chan = peer->chan; |
36b3dd25 JR |
470 | |
471 | status = 1; | |
18722c24 JR |
472 | } |
473 | ||
a6f77389 | 474 | lowpan_header_compress(skb, netdev, daddr, dev->netdev->dev_addr); |
36b3dd25 JR |
475 | |
476 | err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0); | |
477 | if (err < 0) | |
478 | return err; | |
479 | ||
480 | return status; | |
481 | } | |
482 | ||
483 | static int header_create(struct sk_buff *skb, struct net_device *netdev, | |
484 | unsigned short type, const void *_daddr, | |
485 | const void *_saddr, unsigned int len) | |
486 | { | |
487 | struct ipv6hdr *hdr; | |
488 | ||
489 | if (type != ETH_P_IPV6) | |
490 | return -EINVAL; | |
491 | ||
492 | hdr = ipv6_hdr(skb); | |
493 | ||
494 | memcpy(&lowpan_cb(skb)->addr, &hdr->daddr, sizeof(struct in6_addr)); | |
18722c24 | 495 | |
36b3dd25 | 496 | return 0; |
18722c24 JR |
497 | } |
498 | ||
499 | /* Packet to BT LE device */ | |
6b8d4a6a | 500 | static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb, |
d7b6b0a5 | 501 | struct net_device *netdev) |
18722c24 | 502 | { |
6b8d4a6a JR |
503 | struct msghdr msg; |
504 | struct kvec iv; | |
505 | int err; | |
506 | ||
507 | /* Remember the skb so that we can send EAGAIN to the caller if | |
d7b6b0a5 | 508 | * we run out of credits. |
6b8d4a6a | 509 | */ |
d7b6b0a5 | 510 | chan->data = skb; |
6b8d4a6a | 511 | |
6b8d4a6a JR |
512 | iv.iov_base = skb->data; |
513 | iv.iov_len = skb->len; | |
514 | ||
c0371da6 | 515 | memset(&msg, 0, sizeof(msg)); |
17836394 | 516 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, &iv, 1, skb->len); |
c0371da6 | 517 | |
6b8d4a6a JR |
518 | err = l2cap_chan_send(chan, &msg, skb->len); |
519 | if (err > 0) { | |
520 | netdev->stats.tx_bytes += err; | |
521 | netdev->stats.tx_packets++; | |
522 | return 0; | |
523 | } | |
524 | ||
525 | if (!err) | |
526 | err = lowpan_cb(skb)->status; | |
527 | ||
528 | if (err < 0) { | |
529 | if (err == -EAGAIN) | |
530 | netdev->stats.tx_dropped++; | |
531 | else | |
532 | netdev->stats.tx_errors++; | |
533 | } | |
18722c24 | 534 | |
6b8d4a6a | 535 | return err; |
18722c24 JR |
536 | } |
537 | ||
9c238ca8 | 538 | static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev) |
18722c24 JR |
539 | { |
540 | struct sk_buff *local_skb; | |
90305829 | 541 | struct lowpan_dev *entry; |
9c238ca8 | 542 | int err = 0; |
18722c24 | 543 | |
90305829 | 544 | rcu_read_lock(); |
18722c24 | 545 | |
90305829 JR |
546 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
547 | struct lowpan_peer *pentry; | |
18722c24 JR |
548 | struct lowpan_dev *dev; |
549 | ||
550 | if (entry->netdev != netdev) | |
551 | continue; | |
552 | ||
553 | dev = lowpan_dev(entry->netdev); | |
554 | ||
90305829 | 555 | list_for_each_entry_rcu(pentry, &dev->peers, list) { |
9c238ca8 JR |
556 | int ret; |
557 | ||
18722c24 JR |
558 | local_skb = skb_clone(skb, GFP_ATOMIC); |
559 | ||
36b3dd25 JR |
560 | BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p", |
561 | netdev->name, | |
562 | &pentry->chan->dst, pentry->chan->dst_type, | |
563 | &pentry->peer_addr, pentry->chan); | |
9c238ca8 JR |
564 | ret = send_pkt(pentry->chan, local_skb, netdev); |
565 | if (ret < 0) | |
566 | err = ret; | |
18722c24 JR |
567 | |
568 | kfree_skb(local_skb); | |
569 | } | |
570 | } | |
571 | ||
90305829 | 572 | rcu_read_unlock(); |
9c238ca8 JR |
573 | |
574 | return err; | |
18722c24 JR |
575 | } |
576 | ||
577 | static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev) | |
578 | { | |
579 | int err = 0; | |
18722c24 JR |
580 | bdaddr_t addr; |
581 | u8 addr_type; | |
582 | ||
36b3dd25 JR |
583 | /* We must take a copy of the skb before we modify/replace the ipv6 |
584 | * header as the header could be used elsewhere | |
585 | */ | |
b0c42cd7 AA |
586 | skb = skb_unshare(skb, GFP_ATOMIC); |
587 | if (!skb) | |
36b3dd25 JR |
588 | return NET_XMIT_DROP; |
589 | ||
590 | /* Return values from setup_header() | |
591 | * <0 - error, packet is dropped | |
592 | * 0 - this is a multicast packet | |
593 | * 1 - this is unicast packet | |
594 | */ | |
595 | err = setup_header(skb, netdev, &addr, &addr_type); | |
596 | if (err < 0) { | |
597 | kfree_skb(skb); | |
598 | return NET_XMIT_DROP; | |
599 | } | |
18722c24 | 600 | |
36b3dd25 JR |
601 | if (err) { |
602 | if (lowpan_cb(skb)->chan) { | |
603 | BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p", | |
604 | netdev->name, &addr, addr_type, | |
605 | &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan); | |
d7b6b0a5 | 606 | err = send_pkt(lowpan_cb(skb)->chan, skb, netdev); |
36b3dd25 | 607 | } else { |
6b8d4a6a | 608 | err = -ENOENT; |
36b3dd25 JR |
609 | } |
610 | } else { | |
611 | /* We need to send the packet to every device behind this | |
612 | * interface. | |
613 | */ | |
9c238ca8 | 614 | err = send_mcast_pkt(skb, netdev); |
18722c24 | 615 | } |
18722c24 | 616 | |
fc12518a JR |
617 | dev_kfree_skb(skb); |
618 | ||
18722c24 JR |
619 | if (err) |
620 | BT_DBG("ERROR: xmit failed (%d)", err); | |
621 | ||
36b3dd25 | 622 | return err < 0 ? NET_XMIT_DROP : err; |
18722c24 JR |
623 | } |
624 | ||
df092306 JR |
625 | static struct lock_class_key bt_tx_busylock; |
626 | static struct lock_class_key bt_netdev_xmit_lock_key; | |
627 | ||
628 | static void bt_set_lockdep_class_one(struct net_device *dev, | |
629 | struct netdev_queue *txq, | |
630 | void *_unused) | |
631 | { | |
632 | lockdep_set_class(&txq->_xmit_lock, &bt_netdev_xmit_lock_key); | |
633 | } | |
634 | ||
635 | static int bt_dev_init(struct net_device *dev) | |
636 | { | |
637 | netdev_for_each_tx_queue(dev, bt_set_lockdep_class_one, NULL); | |
638 | dev->qdisc_tx_busylock = &bt_tx_busylock; | |
639 | ||
640 | return 0; | |
641 | } | |
642 | ||
18722c24 | 643 | static const struct net_device_ops netdev_ops = { |
df092306 | 644 | .ndo_init = bt_dev_init, |
18722c24 JR |
645 | .ndo_start_xmit = bt_xmit, |
646 | }; | |
647 | ||
648 | static struct header_ops header_ops = { | |
649 | .create = header_create, | |
650 | }; | |
651 | ||
652 | static void netdev_setup(struct net_device *dev) | |
653 | { | |
18722c24 JR |
654 | dev->hard_header_len = 0; |
655 | dev->needed_tailroom = 0; | |
156395c9 JR |
656 | dev->flags = IFF_RUNNING | IFF_POINTOPOINT | |
657 | IFF_MULTICAST; | |
18722c24 JR |
658 | dev->watchdog_timeo = 0; |
659 | ||
660 | dev->netdev_ops = &netdev_ops; | |
661 | dev->header_ops = &header_ops; | |
662 | dev->destructor = free_netdev; | |
663 | } | |
664 | ||
665 | static struct device_type bt_type = { | |
666 | .name = "bluetooth", | |
667 | }; | |
668 | ||
669 | static void set_addr(u8 *eui, u8 *addr, u8 addr_type) | |
670 | { | |
671 | /* addr is the BT address in little-endian format */ | |
672 | eui[0] = addr[5]; | |
673 | eui[1] = addr[4]; | |
674 | eui[2] = addr[3]; | |
675 | eui[3] = 0xFF; | |
676 | eui[4] = 0xFE; | |
677 | eui[5] = addr[2]; | |
678 | eui[6] = addr[1]; | |
679 | eui[7] = addr[0]; | |
680 | ||
62bbd5b3 | 681 | /* Universal/local bit set, BT 6lowpan draft ch. 3.2.1 */ |
6b8d4a6a | 682 | if (addr_type == BDADDR_LE_PUBLIC) |
62bbd5b3 | 683 | eui[0] &= ~0x02; |
18722c24 | 684 | else |
62bbd5b3 JR |
685 | eui[0] |= 0x02; |
686 | ||
687 | BT_DBG("type %d addr %*phC", addr_type, 8, eui); | |
18722c24 JR |
688 | } |
689 | ||
690 | static void set_dev_addr(struct net_device *netdev, bdaddr_t *addr, | |
691 | u8 addr_type) | |
692 | { | |
693 | netdev->addr_assign_type = NET_ADDR_PERM; | |
694 | set_addr(netdev->dev_addr, addr->b, addr_type); | |
18722c24 JR |
695 | } |
696 | ||
697 | static void ifup(struct net_device *netdev) | |
698 | { | |
699 | int err; | |
700 | ||
701 | rtnl_lock(); | |
702 | err = dev_open(netdev); | |
703 | if (err < 0) | |
704 | BT_INFO("iface %s cannot be opened (%d)", netdev->name, err); | |
705 | rtnl_unlock(); | |
706 | } | |
707 | ||
7f118253 JR |
708 | static void ifdown(struct net_device *netdev) |
709 | { | |
710 | int err; | |
711 | ||
712 | rtnl_lock(); | |
713 | err = dev_close(netdev); | |
714 | if (err < 0) | |
715 | BT_INFO("iface %s cannot be closed (%d)", netdev->name, err); | |
716 | rtnl_unlock(); | |
717 | } | |
718 | ||
18722c24 JR |
719 | static void do_notify_peers(struct work_struct *work) |
720 | { | |
721 | struct lowpan_dev *dev = container_of(work, struct lowpan_dev, | |
722 | notify_peers.work); | |
723 | ||
724 | netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */ | |
725 | } | |
726 | ||
727 | static bool is_bt_6lowpan(struct hci_conn *hcon) | |
728 | { | |
729 | if (hcon->type != LE_LINK) | |
730 | return false; | |
731 | ||
7b2ed60e | 732 | if (!enable_6lowpan) |
6b8d4a6a JR |
733 | return false; |
734 | ||
735 | return true; | |
18722c24 JR |
736 | } |
737 | ||
6b8d4a6a JR |
738 | static struct l2cap_chan *chan_create(void) |
739 | { | |
740 | struct l2cap_chan *chan; | |
741 | ||
742 | chan = l2cap_chan_create(); | |
743 | if (!chan) | |
744 | return NULL; | |
745 | ||
746 | l2cap_chan_set_defaults(chan); | |
747 | ||
748 | chan->chan_type = L2CAP_CHAN_CONN_ORIENTED; | |
749 | chan->mode = L2CAP_MODE_LE_FLOWCTL; | |
301de2cb | 750 | chan->imtu = 1280; |
6b8d4a6a JR |
751 | |
752 | return chan; | |
753 | } | |
754 | ||
b2799cec JR |
755 | static void set_ip_addr_bits(u8 addr_type, u8 *addr) |
756 | { | |
757 | if (addr_type == BDADDR_LE_PUBLIC) | |
758 | *addr |= 0x02; | |
759 | else | |
760 | *addr &= ~0x02; | |
761 | } | |
762 | ||
6b8d4a6a JR |
763 | static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan, |
764 | struct lowpan_dev *dev) | |
18722c24 JR |
765 | { |
766 | struct lowpan_peer *peer; | |
18722c24 JR |
767 | |
768 | peer = kzalloc(sizeof(*peer), GFP_ATOMIC); | |
769 | if (!peer) | |
6b8d4a6a | 770 | return NULL; |
18722c24 | 771 | |
6b8d4a6a | 772 | peer->chan = chan; |
18722c24 JR |
773 | memset(&peer->peer_addr, 0, sizeof(struct in6_addr)); |
774 | ||
775 | /* RFC 2464 ch. 5 */ | |
776 | peer->peer_addr.s6_addr[0] = 0xFE; | |
777 | peer->peer_addr.s6_addr[1] = 0x80; | |
6b8d4a6a JR |
778 | set_addr((u8 *)&peer->peer_addr.s6_addr + 8, chan->dst.b, |
779 | chan->dst_type); | |
18722c24 JR |
780 | |
781 | memcpy(&peer->eui64_addr, (u8 *)&peer->peer_addr.s6_addr + 8, | |
782 | EUI64_ADDR_LEN); | |
18722c24 | 783 | |
b2799cec JR |
784 | /* IPv6 address needs to have the U/L bit set properly so toggle |
785 | * it back here. | |
786 | */ | |
787 | set_ip_addr_bits(chan->dst_type, (u8 *)&peer->peer_addr.s6_addr + 8); | |
788 | ||
90305829 | 789 | spin_lock(&devices_lock); |
18722c24 JR |
790 | INIT_LIST_HEAD(&peer->list); |
791 | peer_add(dev, peer); | |
90305829 | 792 | spin_unlock(&devices_lock); |
18722c24 JR |
793 | |
794 | /* Notifying peers about us needs to be done without locks held */ | |
795 | INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers); | |
796 | schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100)); | |
797 | ||
6b8d4a6a | 798 | return peer->chan; |
18722c24 JR |
799 | } |
800 | ||
6b8d4a6a | 801 | static int setup_netdev(struct l2cap_chan *chan, struct lowpan_dev **dev) |
18722c24 | 802 | { |
18722c24 JR |
803 | struct net_device *netdev; |
804 | int err = 0; | |
18722c24 | 805 | |
b72f6f51 AA |
806 | netdev = alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_dev)), |
807 | IFACE_NAME_TEMPLATE, NET_NAME_UNKNOWN, | |
808 | netdev_setup); | |
18722c24 JR |
809 | if (!netdev) |
810 | return -ENOMEM; | |
811 | ||
6b8d4a6a | 812 | set_dev_addr(netdev, &chan->src, chan->src_type); |
18722c24 JR |
813 | |
814 | netdev->netdev_ops = &netdev_ops; | |
fc84242f | 815 | SET_NETDEV_DEV(netdev, &chan->conn->hcon->hdev->dev); |
18722c24 JR |
816 | SET_NETDEV_DEVTYPE(netdev, &bt_type); |
817 | ||
a42bbba5 | 818 | *dev = lowpan_dev(netdev); |
5857d1db AA |
819 | (*dev)->netdev = netdev; |
820 | (*dev)->hdev = chan->conn->hcon->hdev; | |
821 | INIT_LIST_HEAD(&(*dev)->peers); | |
822 | ||
823 | spin_lock(&devices_lock); | |
824 | INIT_LIST_HEAD(&(*dev)->list); | |
825 | list_add_rcu(&(*dev)->list, &bt_6lowpan_devices); | |
826 | spin_unlock(&devices_lock); | |
827 | ||
00f59314 | 828 | err = lowpan_register_netdev(netdev, LOWPAN_LLTYPE_BTLE); |
18722c24 JR |
829 | if (err < 0) { |
830 | BT_INFO("register_netdev failed %d", err); | |
5857d1db AA |
831 | spin_lock(&devices_lock); |
832 | list_del_rcu(&(*dev)->list); | |
833 | spin_unlock(&devices_lock); | |
18722c24 JR |
834 | free_netdev(netdev); |
835 | goto out; | |
836 | } | |
837 | ||
6b8d4a6a JR |
838 | BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d", |
839 | netdev->ifindex, &chan->dst, chan->dst_type, | |
840 | &chan->src, chan->src_type); | |
18722c24 JR |
841 | set_bit(__LINK_STATE_PRESENT, &netdev->state); |
842 | ||
6b8d4a6a | 843 | return 0; |
18722c24 JR |
844 | |
845 | out: | |
846 | return err; | |
847 | } | |
848 | ||
6b8d4a6a JR |
849 | static inline void chan_ready_cb(struct l2cap_chan *chan) |
850 | { | |
851 | struct lowpan_dev *dev; | |
852 | ||
853 | dev = lookup_dev(chan->conn); | |
854 | ||
855 | BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev); | |
856 | ||
857 | if (!dev) { | |
858 | if (setup_netdev(chan, &dev) < 0) { | |
859 | l2cap_chan_del(chan, -ENOENT); | |
860 | return; | |
861 | } | |
862 | } | |
863 | ||
18d93c17 JR |
864 | if (!try_module_get(THIS_MODULE)) |
865 | return; | |
866 | ||
6b8d4a6a JR |
867 | add_peer_chan(chan, dev); |
868 | ifup(dev->netdev); | |
869 | } | |
870 | ||
2b293490 | 871 | static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan) |
6b8d4a6a | 872 | { |
2b293490 | 873 | struct l2cap_chan *chan; |
6b8d4a6a | 874 | |
630ef791 JH |
875 | chan = chan_create(); |
876 | if (!chan) | |
877 | return NULL; | |
878 | ||
2b293490 | 879 | chan->ops = pchan->ops; |
6b8d4a6a JR |
880 | |
881 | BT_DBG("chan %p pchan %p", chan, pchan); | |
882 | ||
2b293490 | 883 | return chan; |
6b8d4a6a JR |
884 | } |
885 | ||
18722c24 JR |
886 | static void delete_netdev(struct work_struct *work) |
887 | { | |
888 | struct lowpan_dev *entry = container_of(work, struct lowpan_dev, | |
889 | delete_netdev); | |
890 | ||
00f59314 | 891 | lowpan_unregister_netdev(entry->netdev); |
18722c24 | 892 | |
2ad88fb2 | 893 | /* The entry pointer is deleted by the netdev destructor. */ |
18722c24 JR |
894 | } |
895 | ||
6b8d4a6a | 896 | static void chan_close_cb(struct l2cap_chan *chan) |
18722c24 | 897 | { |
90305829 | 898 | struct lowpan_dev *entry; |
18722c24 JR |
899 | struct lowpan_dev *dev = NULL; |
900 | struct lowpan_peer *peer; | |
901 | int err = -ENOENT; | |
f63666d2 | 902 | bool last = false, remove = true; |
18722c24 | 903 | |
6b8d4a6a JR |
904 | BT_DBG("chan %p conn %p", chan, chan->conn); |
905 | ||
906 | if (chan->conn && chan->conn->hcon) { | |
907 | if (!is_bt_6lowpan(chan->conn->hcon)) | |
908 | return; | |
909 | ||
910 | /* If conn is set, then the netdev is also there and we should | |
911 | * not remove it. | |
912 | */ | |
f63666d2 | 913 | remove = false; |
6b8d4a6a | 914 | } |
18722c24 | 915 | |
90305829 | 916 | spin_lock(&devices_lock); |
18722c24 | 917 | |
90305829 | 918 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
18722c24 | 919 | dev = lowpan_dev(entry->netdev); |
90305829 | 920 | peer = __peer_lookup_chan(dev, chan); |
18722c24 JR |
921 | if (peer) { |
922 | last = peer_del(dev, peer); | |
923 | err = 0; | |
6b8d4a6a JR |
924 | |
925 | BT_DBG("dev %p removing %speer %p", dev, | |
926 | last ? "last " : "1 ", peer); | |
927 | BT_DBG("chan %p orig refcnt %d", chan, | |
928 | atomic_read(&chan->kref.refcount)); | |
929 | ||
930 | l2cap_chan_put(chan); | |
18722c24 JR |
931 | break; |
932 | } | |
933 | } | |
934 | ||
935 | if (!err && last && dev && !atomic_read(&dev->peer_count)) { | |
90305829 | 936 | spin_unlock(&devices_lock); |
18722c24 JR |
937 | |
938 | cancel_delayed_work_sync(&dev->notify_peers); | |
939 | ||
7f118253 JR |
940 | ifdown(dev->netdev); |
941 | ||
f63666d2 | 942 | if (remove) { |
6b8d4a6a JR |
943 | INIT_WORK(&entry->delete_netdev, delete_netdev); |
944 | schedule_work(&entry->delete_netdev); | |
945 | } | |
18722c24 | 946 | } else { |
90305829 | 947 | spin_unlock(&devices_lock); |
18722c24 JR |
948 | } |
949 | ||
6b8d4a6a JR |
950 | return; |
951 | } | |
952 | ||
953 | static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err) | |
954 | { | |
955 | BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn, | |
956 | state_to_string(state), err); | |
957 | } | |
958 | ||
959 | static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan, | |
960 | unsigned long hdr_len, | |
961 | unsigned long len, int nb) | |
962 | { | |
963 | /* Note that we must allocate using GFP_ATOMIC here as | |
964 | * this function is called originally from netdev hard xmit | |
965 | * function in atomic context. | |
966 | */ | |
967 | return bt_skb_alloc(hdr_len + len, GFP_ATOMIC); | |
968 | } | |
969 | ||
970 | static void chan_suspend_cb(struct l2cap_chan *chan) | |
971 | { | |
972 | struct sk_buff *skb = chan->data; | |
973 | ||
974 | BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb); | |
975 | ||
59790aa2 JR |
976 | if (!skb) |
977 | return; | |
978 | ||
6b8d4a6a JR |
979 | lowpan_cb(skb)->status = -EAGAIN; |
980 | } | |
981 | ||
982 | static void chan_resume_cb(struct l2cap_chan *chan) | |
983 | { | |
984 | struct sk_buff *skb = chan->data; | |
985 | ||
986 | BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb); | |
987 | ||
59790aa2 JR |
988 | if (!skb) |
989 | return; | |
990 | ||
6b8d4a6a JR |
991 | lowpan_cb(skb)->status = 0; |
992 | } | |
993 | ||
994 | static long chan_get_sndtimeo_cb(struct l2cap_chan *chan) | |
995 | { | |
2ae50d8d | 996 | return L2CAP_CONN_TIMEOUT; |
6b8d4a6a JR |
997 | } |
998 | ||
999 | static const struct l2cap_ops bt_6lowpan_chan_ops = { | |
1000 | .name = "L2CAP 6LoWPAN channel", | |
1001 | .new_connection = chan_new_conn_cb, | |
1002 | .recv = chan_recv_cb, | |
1003 | .close = chan_close_cb, | |
1004 | .state_change = chan_state_change_cb, | |
1005 | .ready = chan_ready_cb, | |
1006 | .resume = chan_resume_cb, | |
1007 | .suspend = chan_suspend_cb, | |
1008 | .get_sndtimeo = chan_get_sndtimeo_cb, | |
1009 | .alloc_skb = chan_alloc_skb_cb, | |
6b8d4a6a JR |
1010 | |
1011 | .teardown = l2cap_chan_no_teardown, | |
1012 | .defer = l2cap_chan_no_defer, | |
1013 | .set_shutdown = l2cap_chan_no_set_shutdown, | |
1014 | }; | |
1015 | ||
1016 | static inline __u8 bdaddr_type(__u8 type) | |
1017 | { | |
1018 | if (type == ADDR_LE_DEV_PUBLIC) | |
1019 | return BDADDR_LE_PUBLIC; | |
1020 | else | |
1021 | return BDADDR_LE_RANDOM; | |
1022 | } | |
1023 | ||
6b8d4a6a JR |
1024 | static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type) |
1025 | { | |
0cd088fc | 1026 | struct l2cap_chan *chan; |
6b8d4a6a JR |
1027 | int err; |
1028 | ||
26d46dff | 1029 | chan = chan_create(); |
0cd088fc | 1030 | if (!chan) |
6b8d4a6a JR |
1031 | return -EINVAL; |
1032 | ||
26d46dff JH |
1033 | chan->ops = &bt_6lowpan_chan_ops; |
1034 | ||
0cd088fc | 1035 | err = l2cap_chan_connect(chan, cpu_to_le16(L2CAP_PSM_IPSP), 0, |
6b8d4a6a JR |
1036 | addr, dst_type); |
1037 | ||
0cd088fc | 1038 | BT_DBG("chan %p err %d", chan, err); |
6b8d4a6a | 1039 | if (err < 0) |
0cd088fc | 1040 | l2cap_chan_put(chan); |
6b8d4a6a | 1041 | |
18722c24 JR |
1042 | return err; |
1043 | } | |
1044 | ||
6b8d4a6a JR |
1045 | static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type) |
1046 | { | |
1047 | struct lowpan_peer *peer; | |
1048 | ||
1049 | BT_DBG("conn %p dst type %d", conn, dst_type); | |
1050 | ||
1051 | peer = lookup_peer(conn); | |
1052 | if (!peer) | |
1053 | return -ENOENT; | |
1054 | ||
1055 | BT_DBG("peer %p chan %p", peer, peer->chan); | |
1056 | ||
1057 | l2cap_chan_close(peer->chan, ENOENT); | |
1058 | ||
1059 | return 0; | |
1060 | } | |
1061 | ||
1062 | static struct l2cap_chan *bt_6lowpan_listen(void) | |
1063 | { | |
1064 | bdaddr_t *addr = BDADDR_ANY; | |
0cd088fc | 1065 | struct l2cap_chan *chan; |
6b8d4a6a JR |
1066 | int err; |
1067 | ||
7b2ed60e | 1068 | if (!enable_6lowpan) |
6b8d4a6a JR |
1069 | return NULL; |
1070 | ||
26d46dff | 1071 | chan = chan_create(); |
0cd088fc | 1072 | if (!chan) |
6b8d4a6a JR |
1073 | return NULL; |
1074 | ||
26d46dff | 1075 | chan->ops = &bt_6lowpan_chan_ops; |
0cd088fc JH |
1076 | chan->state = BT_LISTEN; |
1077 | chan->src_type = BDADDR_LE_PUBLIC; | |
6b8d4a6a | 1078 | |
0cd088fc | 1079 | atomic_set(&chan->nesting, L2CAP_NESTING_PARENT); |
2773b024 | 1080 | |
0cd088fc | 1081 | BT_DBG("chan %p src type %d", chan, chan->src_type); |
6b8d4a6a | 1082 | |
0cd088fc | 1083 | err = l2cap_add_psm(chan, addr, cpu_to_le16(L2CAP_PSM_IPSP)); |
6b8d4a6a | 1084 | if (err) { |
0cd088fc | 1085 | l2cap_chan_put(chan); |
6b8d4a6a JR |
1086 | BT_ERR("psm cannot be added err %d", err); |
1087 | return NULL; | |
1088 | } | |
1089 | ||
0cd088fc | 1090 | return chan; |
6b8d4a6a JR |
1091 | } |
1092 | ||
1093 | static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type, | |
1094 | struct l2cap_conn **conn) | |
1095 | { | |
1096 | struct hci_conn *hcon; | |
1097 | struct hci_dev *hdev; | |
1098 | bdaddr_t *src = BDADDR_ANY; | |
1099 | int n; | |
1100 | ||
1101 | n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu", | |
1102 | &addr->b[5], &addr->b[4], &addr->b[3], | |
1103 | &addr->b[2], &addr->b[1], &addr->b[0], | |
1104 | addr_type); | |
1105 | ||
1106 | if (n < 7) | |
1107 | return -EINVAL; | |
1108 | ||
1109 | hdev = hci_get_route(addr, src); | |
1110 | if (!hdev) | |
1111 | return -ENOENT; | |
1112 | ||
1113 | hci_dev_lock(hdev); | |
f5ad4ffc | 1114 | hcon = hci_conn_hash_lookup_le(hdev, addr, *addr_type); |
6b8d4a6a JR |
1115 | hci_dev_unlock(hdev); |
1116 | ||
1117 | if (!hcon) | |
1118 | return -ENOENT; | |
1119 | ||
1120 | *conn = (struct l2cap_conn *)hcon->l2cap_data; | |
1121 | ||
1122 | BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type); | |
1123 | ||
1124 | return 0; | |
1125 | } | |
1126 | ||
1127 | static void disconnect_all_peers(void) | |
1128 | { | |
90305829 | 1129 | struct lowpan_dev *entry; |
6b8d4a6a JR |
1130 | struct lowpan_peer *peer, *tmp_peer, *new_peer; |
1131 | struct list_head peers; | |
6b8d4a6a JR |
1132 | |
1133 | INIT_LIST_HEAD(&peers); | |
1134 | ||
1135 | /* We make a separate list of peers as the close_cb() will | |
1136 | * modify the device peers list so it is better not to mess | |
1137 | * with the same list at the same time. | |
1138 | */ | |
1139 | ||
90305829 | 1140 | rcu_read_lock(); |
6b8d4a6a | 1141 | |
90305829 JR |
1142 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
1143 | list_for_each_entry_rcu(peer, &entry->peers, list) { | |
6b8d4a6a JR |
1144 | new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC); |
1145 | if (!new_peer) | |
1146 | break; | |
1147 | ||
1148 | new_peer->chan = peer->chan; | |
1149 | INIT_LIST_HEAD(&new_peer->list); | |
1150 | ||
1151 | list_add(&new_peer->list, &peers); | |
1152 | } | |
1153 | } | |
1154 | ||
90305829 | 1155 | rcu_read_unlock(); |
6b8d4a6a | 1156 | |
90305829 | 1157 | spin_lock(&devices_lock); |
6b8d4a6a JR |
1158 | list_for_each_entry_safe(peer, tmp_peer, &peers, list) { |
1159 | l2cap_chan_close(peer->chan, ENOENT); | |
90305829 JR |
1160 | |
1161 | list_del_rcu(&peer->list); | |
4e790226 | 1162 | kfree_rcu(peer, rcu); |
6b8d4a6a | 1163 | } |
90305829 | 1164 | spin_unlock(&devices_lock); |
6b8d4a6a JR |
1165 | } |
1166 | ||
7b2ed60e | 1167 | struct set_enable { |
90305829 | 1168 | struct work_struct work; |
7b2ed60e | 1169 | bool flag; |
90305829 | 1170 | }; |
6b8d4a6a | 1171 | |
7b2ed60e | 1172 | static void do_enable_set(struct work_struct *work) |
90305829 | 1173 | { |
7b2ed60e JR |
1174 | struct set_enable *set_enable = container_of(work, |
1175 | struct set_enable, work); | |
90305829 | 1176 | |
7b2ed60e | 1177 | if (!set_enable->flag || enable_6lowpan != set_enable->flag) |
6b8d4a6a | 1178 | /* Disconnect existing connections if 6lowpan is |
7b2ed60e | 1179 | * disabled |
6b8d4a6a JR |
1180 | */ |
1181 | disconnect_all_peers(); | |
1182 | ||
7b2ed60e | 1183 | enable_6lowpan = set_enable->flag; |
6b8d4a6a JR |
1184 | |
1185 | if (listen_chan) { | |
1186 | l2cap_chan_close(listen_chan, 0); | |
1187 | l2cap_chan_put(listen_chan); | |
1188 | } | |
1189 | ||
1190 | listen_chan = bt_6lowpan_listen(); | |
1191 | ||
7b2ed60e | 1192 | kfree(set_enable); |
90305829 JR |
1193 | } |
1194 | ||
7b2ed60e | 1195 | static int lowpan_enable_set(void *data, u64 val) |
90305829 | 1196 | { |
7b2ed60e | 1197 | struct set_enable *set_enable; |
90305829 | 1198 | |
7b2ed60e JR |
1199 | set_enable = kzalloc(sizeof(*set_enable), GFP_KERNEL); |
1200 | if (!set_enable) | |
90305829 JR |
1201 | return -ENOMEM; |
1202 | ||
7b2ed60e JR |
1203 | set_enable->flag = !!val; |
1204 | INIT_WORK(&set_enable->work, do_enable_set); | |
90305829 | 1205 | |
7b2ed60e | 1206 | schedule_work(&set_enable->work); |
90305829 | 1207 | |
6b8d4a6a JR |
1208 | return 0; |
1209 | } | |
1210 | ||
7b2ed60e | 1211 | static int lowpan_enable_get(void *data, u64 *val) |
6b8d4a6a | 1212 | { |
7b2ed60e | 1213 | *val = enable_6lowpan; |
6b8d4a6a JR |
1214 | return 0; |
1215 | } | |
1216 | ||
7b2ed60e JR |
1217 | DEFINE_SIMPLE_ATTRIBUTE(lowpan_enable_fops, lowpan_enable_get, |
1218 | lowpan_enable_set, "%llu\n"); | |
6b8d4a6a JR |
1219 | |
1220 | static ssize_t lowpan_control_write(struct file *fp, | |
1221 | const char __user *user_buffer, | |
1222 | size_t count, | |
1223 | loff_t *position) | |
1224 | { | |
1225 | char buf[32]; | |
1226 | size_t buf_size = min(count, sizeof(buf) - 1); | |
1227 | int ret; | |
1228 | bdaddr_t addr; | |
1229 | u8 addr_type; | |
1230 | struct l2cap_conn *conn = NULL; | |
1231 | ||
1232 | if (copy_from_user(buf, user_buffer, buf_size)) | |
1233 | return -EFAULT; | |
1234 | ||
1235 | buf[buf_size] = '\0'; | |
1236 | ||
1237 | if (memcmp(buf, "connect ", 8) == 0) { | |
1238 | ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn); | |
1239 | if (ret == -EINVAL) | |
1240 | return ret; | |
1241 | ||
1242 | if (listen_chan) { | |
1243 | l2cap_chan_close(listen_chan, 0); | |
1244 | l2cap_chan_put(listen_chan); | |
1245 | listen_chan = NULL; | |
1246 | } | |
1247 | ||
1248 | if (conn) { | |
1249 | struct lowpan_peer *peer; | |
1250 | ||
1251 | if (!is_bt_6lowpan(conn->hcon)) | |
1252 | return -EINVAL; | |
1253 | ||
1254 | peer = lookup_peer(conn); | |
1255 | if (peer) { | |
1256 | BT_DBG("6LoWPAN connection already exists"); | |
1257 | return -EALREADY; | |
1258 | } | |
1259 | ||
1260 | BT_DBG("conn %p dst %pMR type %d user %d", conn, | |
1261 | &conn->hcon->dst, conn->hcon->dst_type, | |
1262 | addr_type); | |
1263 | } | |
1264 | ||
1265 | ret = bt_6lowpan_connect(&addr, addr_type); | |
1266 | if (ret < 0) | |
1267 | return ret; | |
1268 | ||
1269 | return count; | |
1270 | } | |
1271 | ||
1272 | if (memcmp(buf, "disconnect ", 11) == 0) { | |
1273 | ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn); | |
1274 | if (ret < 0) | |
1275 | return ret; | |
1276 | ||
1277 | ret = bt_6lowpan_disconnect(conn, addr_type); | |
1278 | if (ret < 0) | |
1279 | return ret; | |
1280 | ||
1281 | return count; | |
1282 | } | |
1283 | ||
1284 | return count; | |
1285 | } | |
1286 | ||
1287 | static int lowpan_control_show(struct seq_file *f, void *ptr) | |
1288 | { | |
90305829 JR |
1289 | struct lowpan_dev *entry; |
1290 | struct lowpan_peer *peer; | |
6b8d4a6a | 1291 | |
90305829 | 1292 | spin_lock(&devices_lock); |
6b8d4a6a | 1293 | |
90305829 JR |
1294 | list_for_each_entry(entry, &bt_6lowpan_devices, list) { |
1295 | list_for_each_entry(peer, &entry->peers, list) | |
6b8d4a6a JR |
1296 | seq_printf(f, "%pMR (type %u)\n", |
1297 | &peer->chan->dst, peer->chan->dst_type); | |
1298 | } | |
1299 | ||
90305829 | 1300 | spin_unlock(&devices_lock); |
6b8d4a6a JR |
1301 | |
1302 | return 0; | |
1303 | } | |
1304 | ||
1305 | static int lowpan_control_open(struct inode *inode, struct file *file) | |
1306 | { | |
1307 | return single_open(file, lowpan_control_show, inode->i_private); | |
1308 | } | |
1309 | ||
1310 | static const struct file_operations lowpan_control_fops = { | |
1311 | .open = lowpan_control_open, | |
1312 | .read = seq_read, | |
1313 | .write = lowpan_control_write, | |
1314 | .llseek = seq_lseek, | |
1315 | .release = single_release, | |
1316 | }; | |
1317 | ||
7f118253 JR |
1318 | static void disconnect_devices(void) |
1319 | { | |
daac197c | 1320 | struct lowpan_dev *entry, *tmp, *new_dev; |
7f118253 | 1321 | struct list_head devices; |
7f118253 JR |
1322 | |
1323 | INIT_LIST_HEAD(&devices); | |
1324 | ||
1325 | /* We make a separate list of devices because the unregister_netdev() | |
1326 | * will call device_event() which will also want to modify the same | |
1327 | * devices list. | |
1328 | */ | |
1329 | ||
90305829 | 1330 | rcu_read_lock(); |
7f118253 | 1331 | |
90305829 | 1332 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
7f118253 JR |
1333 | new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC); |
1334 | if (!new_dev) | |
1335 | break; | |
1336 | ||
1337 | new_dev->netdev = entry->netdev; | |
1338 | INIT_LIST_HEAD(&new_dev->list); | |
1339 | ||
90305829 | 1340 | list_add_rcu(&new_dev->list, &devices); |
7f118253 JR |
1341 | } |
1342 | ||
90305829 | 1343 | rcu_read_unlock(); |
7f118253 | 1344 | |
daac197c | 1345 | list_for_each_entry_safe(entry, tmp, &devices, list) { |
7f118253 JR |
1346 | ifdown(entry->netdev); |
1347 | BT_DBG("Unregistering netdev %s %p", | |
1348 | entry->netdev->name, entry->netdev); | |
00f59314 | 1349 | lowpan_unregister_netdev(entry->netdev); |
7f118253 JR |
1350 | kfree(entry); |
1351 | } | |
1352 | } | |
1353 | ||
18722c24 JR |
1354 | static int device_event(struct notifier_block *unused, |
1355 | unsigned long event, void *ptr) | |
1356 | { | |
1357 | struct net_device *netdev = netdev_notifier_info_to_dev(ptr); | |
90305829 | 1358 | struct lowpan_dev *entry; |
18722c24 JR |
1359 | |
1360 | if (netdev->type != ARPHRD_6LOWPAN) | |
1361 | return NOTIFY_DONE; | |
1362 | ||
1363 | switch (event) { | |
1364 | case NETDEV_UNREGISTER: | |
90305829 JR |
1365 | spin_lock(&devices_lock); |
1366 | list_for_each_entry(entry, &bt_6lowpan_devices, list) { | |
18722c24 | 1367 | if (entry->netdev == netdev) { |
7f118253 JR |
1368 | BT_DBG("Unregistered netdev %s %p", |
1369 | netdev->name, netdev); | |
18722c24 | 1370 | list_del(&entry->list); |
18722c24 JR |
1371 | break; |
1372 | } | |
1373 | } | |
90305829 | 1374 | spin_unlock(&devices_lock); |
18722c24 JR |
1375 | break; |
1376 | } | |
1377 | ||
1378 | return NOTIFY_DONE; | |
1379 | } | |
1380 | ||
1381 | static struct notifier_block bt_6lowpan_dev_notifier = { | |
1382 | .notifier_call = device_event, | |
1383 | }; | |
1384 | ||
5547e48c | 1385 | static int __init bt_6lowpan_init(void) |
18722c24 | 1386 | { |
7b2ed60e JR |
1387 | lowpan_enable_debugfs = debugfs_create_file("6lowpan_enable", 0644, |
1388 | bt_debugfs, NULL, | |
1389 | &lowpan_enable_fops); | |
6b8d4a6a JR |
1390 | lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644, |
1391 | bt_debugfs, NULL, | |
1392 | &lowpan_control_fops); | |
1393 | ||
18722c24 JR |
1394 | return register_netdevice_notifier(&bt_6lowpan_dev_notifier); |
1395 | } | |
1396 | ||
5547e48c | 1397 | static void __exit bt_6lowpan_exit(void) |
18722c24 | 1398 | { |
7b2ed60e | 1399 | debugfs_remove(lowpan_enable_debugfs); |
6b8d4a6a JR |
1400 | debugfs_remove(lowpan_control_debugfs); |
1401 | ||
1402 | if (listen_chan) { | |
1403 | l2cap_chan_close(listen_chan, 0); | |
1404 | l2cap_chan_put(listen_chan); | |
1405 | } | |
1406 | ||
7f118253 JR |
1407 | disconnect_devices(); |
1408 | ||
18722c24 JR |
1409 | unregister_netdevice_notifier(&bt_6lowpan_dev_notifier); |
1410 | } | |
5547e48c JR |
1411 | |
1412 | module_init(bt_6lowpan_init); | |
1413 | module_exit(bt_6lowpan_exit); | |
1414 | ||
1415 | MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>"); | |
1416 | MODULE_DESCRIPTION("Bluetooth 6LoWPAN"); | |
1417 | MODULE_VERSION(VERSION); | |
1418 | MODULE_LICENSE("GPL"); |