Commit | Line | Data |
---|---|---|
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 | ||
24 | #include <net/af_ieee802154.h> /* to get the address type */ | |
25 | ||
26 | #include <net/bluetooth/bluetooth.h> | |
27 | #include <net/bluetooth/hci_core.h> | |
28 | #include <net/bluetooth/l2cap.h> | |
29 | ||
cefc8c8a | 30 | #include <net/6lowpan.h> /* for the compression support */ |
18722c24 | 31 | |
6b8d4a6a JR |
32 | #define VERSION "0.1" |
33 | ||
34 | static struct dentry *lowpan_psm_debugfs; | |
35 | static struct dentry *lowpan_control_debugfs; | |
36 | ||
18722c24 JR |
37 | #define IFACE_NAME_TEMPLATE "bt%d" |
38 | #define EUI64_ADDR_LEN 8 | |
39 | ||
40 | struct skb_cb { | |
41 | struct in6_addr addr; | |
39e90c77 | 42 | struct in6_addr gw; |
6b8d4a6a JR |
43 | struct l2cap_chan *chan; |
44 | int status; | |
18722c24 JR |
45 | }; |
46 | #define lowpan_cb(skb) ((struct skb_cb *)((skb)->cb)) | |
47 | ||
48 | /* The devices list contains those devices that we are acting | |
49 | * as a proxy. The BT 6LoWPAN device is a virtual device that | |
50 | * connects to the Bluetooth LE device. The real connection to | |
51 | * BT device is done via l2cap layer. There exists one | |
52 | * virtual device / one BT 6LoWPAN network (=hciX device). | |
53 | * The list contains struct lowpan_dev elements. | |
54 | */ | |
55 | static LIST_HEAD(bt_6lowpan_devices); | |
90305829 | 56 | static DEFINE_SPINLOCK(devices_lock); |
18722c24 | 57 | |
6b8d4a6a JR |
58 | /* If psm is set to 0 (default value), then 6lowpan is disabled. |
59 | * Other values are used to indicate a Protocol Service Multiplexer | |
60 | * value for 6lowpan. | |
61 | */ | |
62 | static u16 psm_6lowpan; | |
63 | ||
64 | /* We are listening incoming connections via this channel | |
65 | */ | |
66 | static struct l2cap_chan *listen_chan; | |
67 | ||
18722c24 JR |
68 | struct lowpan_peer { |
69 | struct list_head list; | |
90305829 | 70 | struct rcu_head rcu; |
6b8d4a6a | 71 | struct l2cap_chan *chan; |
18722c24 JR |
72 | |
73 | /* peer addresses in various formats */ | |
74 | unsigned char eui64_addr[EUI64_ADDR_LEN]; | |
75 | struct in6_addr peer_addr; | |
76 | }; | |
77 | ||
78 | struct lowpan_dev { | |
79 | struct list_head list; | |
80 | ||
81 | struct hci_dev *hdev; | |
82 | struct net_device *netdev; | |
83 | struct list_head peers; | |
84 | atomic_t peer_count; /* number of items in peers list */ | |
85 | ||
86 | struct work_struct delete_netdev; | |
87 | struct delayed_work notify_peers; | |
88 | }; | |
89 | ||
90 | static inline struct lowpan_dev *lowpan_dev(const struct net_device *netdev) | |
91 | { | |
92 | return netdev_priv(netdev); | |
93 | } | |
94 | ||
95 | static inline void peer_add(struct lowpan_dev *dev, struct lowpan_peer *peer) | |
96 | { | |
90305829 | 97 | list_add_rcu(&peer->list, &dev->peers); |
18722c24 JR |
98 | atomic_inc(&dev->peer_count); |
99 | } | |
100 | ||
101 | static inline bool peer_del(struct lowpan_dev *dev, struct lowpan_peer *peer) | |
102 | { | |
90305829 | 103 | list_del_rcu(&peer->list); |
4e790226 | 104 | kfree_rcu(peer, rcu); |
18722c24 | 105 | |
18d93c17 JR |
106 | module_put(THIS_MODULE); |
107 | ||
18722c24 JR |
108 | if (atomic_dec_and_test(&dev->peer_count)) { |
109 | BT_DBG("last peer"); | |
110 | return true; | |
111 | } | |
112 | ||
113 | return false; | |
114 | } | |
115 | ||
116 | static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_dev *dev, | |
117 | bdaddr_t *ba, __u8 type) | |
118 | { | |
90305829 | 119 | struct lowpan_peer *peer; |
18722c24 JR |
120 | |
121 | BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count), | |
122 | ba, type); | |
123 | ||
90305829 JR |
124 | rcu_read_lock(); |
125 | ||
126 | list_for_each_entry_rcu(peer, &dev->peers, list) { | |
6b8d4a6a JR |
127 | BT_DBG("dst addr %pMR dst type %d", |
128 | &peer->chan->dst, peer->chan->dst_type); | |
18722c24 | 129 | |
6b8d4a6a | 130 | if (bacmp(&peer->chan->dst, ba)) |
18722c24 JR |
131 | continue; |
132 | ||
90305829 JR |
133 | if (type == peer->chan->dst_type) { |
134 | rcu_read_unlock(); | |
6b8d4a6a | 135 | return peer; |
90305829 | 136 | } |
6b8d4a6a JR |
137 | } |
138 | ||
90305829 JR |
139 | rcu_read_unlock(); |
140 | ||
6b8d4a6a JR |
141 | return NULL; |
142 | } | |
143 | ||
90305829 JR |
144 | static inline struct lowpan_peer *__peer_lookup_chan(struct lowpan_dev *dev, |
145 | struct l2cap_chan *chan) | |
6b8d4a6a | 146 | { |
90305829 | 147 | struct lowpan_peer *peer; |
6b8d4a6a | 148 | |
90305829 | 149 | list_for_each_entry_rcu(peer, &dev->peers, list) { |
6b8d4a6a | 150 | if (peer->chan == chan) |
18722c24 JR |
151 | return peer; |
152 | } | |
153 | ||
154 | return NULL; | |
155 | } | |
156 | ||
90305829 JR |
157 | static inline struct lowpan_peer *__peer_lookup_conn(struct lowpan_dev *dev, |
158 | struct l2cap_conn *conn) | |
18722c24 | 159 | { |
90305829 | 160 | struct lowpan_peer *peer; |
18722c24 | 161 | |
90305829 | 162 | list_for_each_entry_rcu(peer, &dev->peers, list) { |
6b8d4a6a | 163 | if (peer->chan->conn == conn) |
18722c24 JR |
164 | return peer; |
165 | } | |
166 | ||
167 | return NULL; | |
168 | } | |
169 | ||
39e90c77 JR |
170 | static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_dev *dev, |
171 | struct in6_addr *daddr, | |
172 | struct sk_buff *skb) | |
173 | { | |
90305829 | 174 | struct lowpan_peer *peer; |
39e90c77 JR |
175 | struct in6_addr *nexthop; |
176 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); | |
177 | int count = atomic_read(&dev->peer_count); | |
178 | ||
179 | BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt); | |
180 | ||
181 | /* If we have multiple 6lowpan peers, then check where we should | |
182 | * send the packet. If only one peer exists, then we can send the | |
183 | * packet right away. | |
184 | */ | |
90305829 JR |
185 | if (count == 1) { |
186 | rcu_read_lock(); | |
187 | peer = list_first_or_null_rcu(&dev->peers, struct lowpan_peer, | |
188 | list); | |
189 | rcu_read_unlock(); | |
190 | return peer; | |
191 | } | |
39e90c77 JR |
192 | |
193 | if (!rt) { | |
194 | nexthop = &lowpan_cb(skb)->gw; | |
195 | ||
196 | if (ipv6_addr_any(nexthop)) | |
197 | return NULL; | |
198 | } else { | |
199 | nexthop = rt6_nexthop(rt); | |
200 | ||
201 | /* We need to remember the address because it is needed | |
202 | * by bt_xmit() when sending the packet. In bt_xmit(), the | |
203 | * destination routing info is not set. | |
204 | */ | |
205 | memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr)); | |
206 | } | |
207 | ||
208 | BT_DBG("gw %pI6c", nexthop); | |
209 | ||
90305829 JR |
210 | rcu_read_lock(); |
211 | ||
212 | list_for_each_entry_rcu(peer, &dev->peers, list) { | |
39e90c77 JR |
213 | BT_DBG("dst addr %pMR dst type %d ip %pI6c", |
214 | &peer->chan->dst, peer->chan->dst_type, | |
215 | &peer->peer_addr); | |
216 | ||
90305829 JR |
217 | if (!ipv6_addr_cmp(&peer->peer_addr, nexthop)) { |
218 | rcu_read_unlock(); | |
39e90c77 | 219 | return peer; |
90305829 | 220 | } |
39e90c77 JR |
221 | } |
222 | ||
90305829 JR |
223 | rcu_read_unlock(); |
224 | ||
39e90c77 JR |
225 | return NULL; |
226 | } | |
227 | ||
18722c24 JR |
228 | static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn) |
229 | { | |
90305829 | 230 | struct lowpan_dev *entry; |
18722c24 | 231 | struct lowpan_peer *peer = NULL; |
18722c24 | 232 | |
90305829 | 233 | rcu_read_lock(); |
18722c24 | 234 | |
90305829 JR |
235 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
236 | peer = __peer_lookup_conn(entry, conn); | |
18722c24 JR |
237 | if (peer) |
238 | break; | |
239 | } | |
240 | ||
90305829 | 241 | rcu_read_unlock(); |
18722c24 JR |
242 | |
243 | return peer; | |
244 | } | |
245 | ||
246 | static struct lowpan_dev *lookup_dev(struct l2cap_conn *conn) | |
247 | { | |
90305829 | 248 | struct lowpan_dev *entry; |
18722c24 | 249 | struct lowpan_dev *dev = NULL; |
18722c24 | 250 | |
90305829 | 251 | rcu_read_lock(); |
18722c24 | 252 | |
90305829 | 253 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
18722c24 JR |
254 | if (conn->hcon->hdev == entry->hdev) { |
255 | dev = entry; | |
256 | break; | |
257 | } | |
258 | } | |
259 | ||
90305829 | 260 | rcu_read_unlock(); |
18722c24 JR |
261 | |
262 | return dev; | |
263 | } | |
264 | ||
18722c24 JR |
265 | static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev) |
266 | { | |
267 | struct sk_buff *skb_cp; | |
18722c24 JR |
268 | |
269 | skb_cp = skb_copy(skb, GFP_ATOMIC); | |
270 | if (!skb_cp) | |
f8b36176 | 271 | return NET_RX_DROP; |
18722c24 | 272 | |
4456c50d | 273 | return netif_rx(skb_cp); |
18722c24 JR |
274 | } |
275 | ||
01141234 MT |
276 | static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev, |
277 | struct l2cap_chan *chan) | |
18722c24 JR |
278 | { |
279 | const u8 *saddr, *daddr; | |
280 | u8 iphc0, iphc1; | |
281 | struct lowpan_dev *dev; | |
282 | struct lowpan_peer *peer; | |
18722c24 JR |
283 | |
284 | dev = lowpan_dev(netdev); | |
285 | ||
90305829 JR |
286 | rcu_read_lock(); |
287 | peer = __peer_lookup_chan(dev, chan); | |
288 | rcu_read_unlock(); | |
18722c24 | 289 | if (!peer) |
56b2c3ee | 290 | return -EINVAL; |
18722c24 JR |
291 | |
292 | saddr = peer->eui64_addr; | |
293 | daddr = dev->netdev->dev_addr; | |
294 | ||
295 | /* at least two bytes will be used for the encoding */ | |
296 | if (skb->len < 2) | |
56b2c3ee | 297 | return -EINVAL; |
18722c24 JR |
298 | |
299 | if (lowpan_fetch_skb_u8(skb, &iphc0)) | |
56b2c3ee | 300 | return -EINVAL; |
18722c24 JR |
301 | |
302 | if (lowpan_fetch_skb_u8(skb, &iphc1)) | |
56b2c3ee | 303 | return -EINVAL; |
18722c24 | 304 | |
01141234 MT |
305 | return lowpan_header_decompress(skb, netdev, |
306 | saddr, IEEE802154_ADDR_LONG, | |
307 | EUI64_ADDR_LEN, daddr, | |
308 | IEEE802154_ADDR_LONG, EUI64_ADDR_LEN, | |
309 | iphc0, iphc1); | |
18722c24 | 310 | |
18722c24 JR |
311 | } |
312 | ||
313 | static int recv_pkt(struct sk_buff *skb, struct net_device *dev, | |
6b8d4a6a | 314 | struct l2cap_chan *chan) |
18722c24 JR |
315 | { |
316 | struct sk_buff *local_skb; | |
317 | int ret; | |
318 | ||
319 | if (!netif_running(dev)) | |
320 | goto drop; | |
321 | ||
322 | if (dev->type != ARPHRD_6LOWPAN) | |
323 | goto drop; | |
324 | ||
11e3ff70 MT |
325 | skb = skb_share_check(skb, GFP_ATOMIC); |
326 | if (!skb) | |
327 | goto drop; | |
328 | ||
18722c24 JR |
329 | /* check that it's our buffer */ |
330 | if (skb->data[0] == LOWPAN_DISPATCH_IPV6) { | |
331 | /* Copy the packet so that the IPv6 header is | |
332 | * properly aligned. | |
333 | */ | |
334 | local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1, | |
335 | skb_tailroom(skb), GFP_ATOMIC); | |
336 | if (!local_skb) | |
337 | goto drop; | |
338 | ||
339 | local_skb->protocol = htons(ETH_P_IPV6); | |
340 | local_skb->pkt_type = PACKET_HOST; | |
341 | ||
342 | skb_reset_network_header(local_skb); | |
343 | skb_set_transport_header(local_skb, sizeof(struct ipv6hdr)); | |
344 | ||
345 | if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) { | |
346 | kfree_skb(local_skb); | |
347 | goto drop; | |
348 | } | |
349 | ||
350 | dev->stats.rx_bytes += skb->len; | |
351 | dev->stats.rx_packets++; | |
352 | ||
3c400b84 MT |
353 | consume_skb(local_skb); |
354 | consume_skb(skb); | |
18722c24 JR |
355 | } else { |
356 | switch (skb->data[0] & 0xe0) { | |
357 | case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */ | |
358 | local_skb = skb_clone(skb, GFP_ATOMIC); | |
359 | if (!local_skb) | |
360 | goto drop; | |
361 | ||
01141234 | 362 | ret = iphc_decompress(local_skb, dev, chan); |
56b2c3ee MT |
363 | if (ret < 0) { |
364 | kfree_skb(local_skb); | |
18722c24 | 365 | goto drop; |
56b2c3ee | 366 | } |
18722c24 | 367 | |
f8b36176 MT |
368 | local_skb->protocol = htons(ETH_P_IPV6); |
369 | local_skb->pkt_type = PACKET_HOST; | |
370 | local_skb->dev = dev; | |
371 | ||
372 | if (give_skb_to_upper(local_skb, dev) | |
373 | != NET_RX_SUCCESS) { | |
374 | kfree_skb(local_skb); | |
375 | goto drop; | |
376 | } | |
377 | ||
18722c24 JR |
378 | dev->stats.rx_bytes += skb->len; |
379 | dev->stats.rx_packets++; | |
380 | ||
3c400b84 MT |
381 | consume_skb(local_skb); |
382 | consume_skb(skb); | |
18722c24 JR |
383 | break; |
384 | default: | |
385 | break; | |
386 | } | |
387 | } | |
388 | ||
389 | return NET_RX_SUCCESS; | |
390 | ||
391 | drop: | |
6b8d4a6a | 392 | dev->stats.rx_dropped++; |
18722c24 JR |
393 | kfree_skb(skb); |
394 | return NET_RX_DROP; | |
395 | } | |
396 | ||
397 | /* Packet from BT LE device */ | |
6b8d4a6a | 398 | static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
18722c24 JR |
399 | { |
400 | struct lowpan_dev *dev; | |
401 | struct lowpan_peer *peer; | |
402 | int err; | |
403 | ||
6b8d4a6a | 404 | peer = lookup_peer(chan->conn); |
18722c24 JR |
405 | if (!peer) |
406 | return -ENOENT; | |
407 | ||
6b8d4a6a | 408 | dev = lookup_dev(chan->conn); |
30d3db44 | 409 | if (!dev || !dev->netdev) |
18722c24 JR |
410 | return -ENOENT; |
411 | ||
6b8d4a6a JR |
412 | err = recv_pkt(skb, dev->netdev, chan); |
413 | if (err) { | |
414 | BT_DBG("recv pkt %d", err); | |
415 | err = -EAGAIN; | |
18722c24 JR |
416 | } |
417 | ||
6b8d4a6a | 418 | return err; |
18722c24 JR |
419 | } |
420 | ||
62bbd5b3 | 421 | static u8 get_addr_type_from_eui64(u8 byte) |
18722c24 | 422 | { |
6b8d4a6a JR |
423 | /* Is universal(0) or local(1) bit */ |
424 | return ((byte & 0x02) ? BDADDR_LE_RANDOM : BDADDR_LE_PUBLIC); | |
62bbd5b3 JR |
425 | } |
426 | ||
427 | static void copy_to_bdaddr(struct in6_addr *ip6_daddr, bdaddr_t *addr) | |
428 | { | |
429 | u8 *eui64 = ip6_daddr->s6_addr + 8; | |
18722c24 JR |
430 | |
431 | addr->b[0] = eui64[7]; | |
432 | addr->b[1] = eui64[6]; | |
433 | addr->b[2] = eui64[5]; | |
434 | addr->b[3] = eui64[2]; | |
435 | addr->b[4] = eui64[1]; | |
436 | addr->b[5] = eui64[0]; | |
62bbd5b3 | 437 | } |
18722c24 | 438 | |
62bbd5b3 JR |
439 | static void convert_dest_bdaddr(struct in6_addr *ip6_daddr, |
440 | bdaddr_t *addr, u8 *addr_type) | |
441 | { | |
442 | copy_to_bdaddr(ip6_daddr, addr); | |
18722c24 | 443 | |
62bbd5b3 JR |
444 | /* We need to toggle the U/L bit that we got from IPv6 address |
445 | * so that we get the proper address and type of the BD address. | |
446 | */ | |
447 | addr->b[5] ^= 0x02; | |
448 | ||
449 | *addr_type = get_addr_type_from_eui64(addr->b[5]); | |
18722c24 JR |
450 | } |
451 | ||
36b3dd25 JR |
452 | static int setup_header(struct sk_buff *skb, struct net_device *netdev, |
453 | bdaddr_t *peer_addr, u8 *peer_addr_type) | |
18722c24 | 454 | { |
36b3dd25 | 455 | struct in6_addr ipv6_daddr; |
18722c24 JR |
456 | struct lowpan_dev *dev; |
457 | struct lowpan_peer *peer; | |
458 | bdaddr_t addr, *any = BDADDR_ANY; | |
36b3dd25 JR |
459 | u8 *daddr = any->b; |
460 | int err, status = 0; | |
18722c24 JR |
461 | |
462 | dev = lowpan_dev(netdev); | |
463 | ||
36b3dd25 JR |
464 | memcpy(&ipv6_daddr, &lowpan_cb(skb)->addr, sizeof(ipv6_daddr)); |
465 | ||
466 | if (ipv6_addr_is_multicast(&ipv6_daddr)) { | |
6b8d4a6a | 467 | lowpan_cb(skb)->chan = NULL; |
18722c24 | 468 | } else { |
36b3dd25 | 469 | u8 addr_type; |
18722c24 JR |
470 | |
471 | /* Get destination BT device from skb. | |
472 | * If there is no such peer then discard the packet. | |
473 | */ | |
36b3dd25 | 474 | convert_dest_bdaddr(&ipv6_daddr, &addr, &addr_type); |
18722c24 | 475 | |
6b8d4a6a | 476 | BT_DBG("dest addr %pMR type %d IP %pI6c", &addr, |
36b3dd25 | 477 | addr_type, &ipv6_daddr); |
18722c24 | 478 | |
18722c24 | 479 | peer = peer_lookup_ba(dev, &addr, addr_type); |
18722c24 | 480 | if (!peer) { |
39e90c77 JR |
481 | /* The packet might be sent to 6lowpan interface |
482 | * because of routing (either via default route | |
483 | * or user set route) so get peer according to | |
484 | * the destination address. | |
485 | */ | |
36b3dd25 | 486 | peer = peer_lookup_dst(dev, &ipv6_daddr, skb); |
39e90c77 JR |
487 | if (!peer) { |
488 | BT_DBG("no such peer %pMR found", &addr); | |
489 | return -ENOENT; | |
490 | } | |
18722c24 JR |
491 | } |
492 | ||
493 | daddr = peer->eui64_addr; | |
36b3dd25 JR |
494 | *peer_addr = addr; |
495 | *peer_addr_type = addr_type; | |
6b8d4a6a | 496 | lowpan_cb(skb)->chan = peer->chan; |
36b3dd25 JR |
497 | |
498 | status = 1; | |
18722c24 JR |
499 | } |
500 | ||
36b3dd25 JR |
501 | lowpan_header_compress(skb, netdev, ETH_P_IPV6, daddr, |
502 | dev->netdev->dev_addr, skb->len); | |
503 | ||
504 | err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0); | |
505 | if (err < 0) | |
506 | return err; | |
507 | ||
508 | return status; | |
509 | } | |
510 | ||
511 | static int header_create(struct sk_buff *skb, struct net_device *netdev, | |
512 | unsigned short type, const void *_daddr, | |
513 | const void *_saddr, unsigned int len) | |
514 | { | |
515 | struct ipv6hdr *hdr; | |
516 | ||
517 | if (type != ETH_P_IPV6) | |
518 | return -EINVAL; | |
519 | ||
520 | hdr = ipv6_hdr(skb); | |
521 | ||
522 | memcpy(&lowpan_cb(skb)->addr, &hdr->daddr, sizeof(struct in6_addr)); | |
18722c24 | 523 | |
36b3dd25 | 524 | return 0; |
18722c24 JR |
525 | } |
526 | ||
527 | /* Packet to BT LE device */ | |
6b8d4a6a | 528 | static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb, |
d7b6b0a5 | 529 | struct net_device *netdev) |
18722c24 | 530 | { |
6b8d4a6a JR |
531 | struct msghdr msg; |
532 | struct kvec iv; | |
533 | int err; | |
534 | ||
535 | /* Remember the skb so that we can send EAGAIN to the caller if | |
d7b6b0a5 | 536 | * we run out of credits. |
6b8d4a6a | 537 | */ |
d7b6b0a5 | 538 | chan->data = skb; |
6b8d4a6a JR |
539 | |
540 | memset(&msg, 0, sizeof(msg)); | |
541 | msg.msg_iov = (struct iovec *) &iv; | |
542 | msg.msg_iovlen = 1; | |
543 | iv.iov_base = skb->data; | |
544 | iv.iov_len = skb->len; | |
545 | ||
546 | err = l2cap_chan_send(chan, &msg, skb->len); | |
547 | if (err > 0) { | |
548 | netdev->stats.tx_bytes += err; | |
549 | netdev->stats.tx_packets++; | |
550 | return 0; | |
551 | } | |
552 | ||
553 | if (!err) | |
554 | err = lowpan_cb(skb)->status; | |
555 | ||
556 | if (err < 0) { | |
557 | if (err == -EAGAIN) | |
558 | netdev->stats.tx_dropped++; | |
559 | else | |
560 | netdev->stats.tx_errors++; | |
561 | } | |
18722c24 | 562 | |
6b8d4a6a | 563 | return err; |
18722c24 JR |
564 | } |
565 | ||
9c238ca8 | 566 | static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev) |
18722c24 JR |
567 | { |
568 | struct sk_buff *local_skb; | |
90305829 | 569 | struct lowpan_dev *entry; |
9c238ca8 | 570 | int err = 0; |
18722c24 | 571 | |
90305829 | 572 | rcu_read_lock(); |
18722c24 | 573 | |
90305829 JR |
574 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
575 | struct lowpan_peer *pentry; | |
18722c24 JR |
576 | struct lowpan_dev *dev; |
577 | ||
578 | if (entry->netdev != netdev) | |
579 | continue; | |
580 | ||
581 | dev = lowpan_dev(entry->netdev); | |
582 | ||
90305829 | 583 | list_for_each_entry_rcu(pentry, &dev->peers, list) { |
9c238ca8 JR |
584 | int ret; |
585 | ||
18722c24 JR |
586 | local_skb = skb_clone(skb, GFP_ATOMIC); |
587 | ||
36b3dd25 JR |
588 | BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p", |
589 | netdev->name, | |
590 | &pentry->chan->dst, pentry->chan->dst_type, | |
591 | &pentry->peer_addr, pentry->chan); | |
9c238ca8 JR |
592 | ret = send_pkt(pentry->chan, local_skb, netdev); |
593 | if (ret < 0) | |
594 | err = ret; | |
18722c24 JR |
595 | |
596 | kfree_skb(local_skb); | |
597 | } | |
598 | } | |
599 | ||
90305829 | 600 | rcu_read_unlock(); |
9c238ca8 JR |
601 | |
602 | return err; | |
18722c24 JR |
603 | } |
604 | ||
605 | static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev) | |
606 | { | |
607 | int err = 0; | |
18722c24 JR |
608 | bdaddr_t addr; |
609 | u8 addr_type; | |
610 | ||
36b3dd25 JR |
611 | /* We must take a copy of the skb before we modify/replace the ipv6 |
612 | * header as the header could be used elsewhere | |
613 | */ | |
b0c42cd7 AA |
614 | skb = skb_unshare(skb, GFP_ATOMIC); |
615 | if (!skb) | |
36b3dd25 JR |
616 | return NET_XMIT_DROP; |
617 | ||
618 | /* Return values from setup_header() | |
619 | * <0 - error, packet is dropped | |
620 | * 0 - this is a multicast packet | |
621 | * 1 - this is unicast packet | |
622 | */ | |
623 | err = setup_header(skb, netdev, &addr, &addr_type); | |
624 | if (err < 0) { | |
625 | kfree_skb(skb); | |
626 | return NET_XMIT_DROP; | |
627 | } | |
18722c24 | 628 | |
36b3dd25 JR |
629 | if (err) { |
630 | if (lowpan_cb(skb)->chan) { | |
631 | BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p", | |
632 | netdev->name, &addr, addr_type, | |
633 | &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan); | |
d7b6b0a5 | 634 | err = send_pkt(lowpan_cb(skb)->chan, skb, netdev); |
36b3dd25 | 635 | } else { |
6b8d4a6a | 636 | err = -ENOENT; |
36b3dd25 JR |
637 | } |
638 | } else { | |
639 | /* We need to send the packet to every device behind this | |
640 | * interface. | |
641 | */ | |
9c238ca8 | 642 | err = send_mcast_pkt(skb, netdev); |
18722c24 | 643 | } |
18722c24 | 644 | |
fc12518a JR |
645 | dev_kfree_skb(skb); |
646 | ||
18722c24 JR |
647 | if (err) |
648 | BT_DBG("ERROR: xmit failed (%d)", err); | |
649 | ||
36b3dd25 | 650 | return err < 0 ? NET_XMIT_DROP : err; |
18722c24 JR |
651 | } |
652 | ||
df092306 JR |
653 | static struct lock_class_key bt_tx_busylock; |
654 | static struct lock_class_key bt_netdev_xmit_lock_key; | |
655 | ||
656 | static void bt_set_lockdep_class_one(struct net_device *dev, | |
657 | struct netdev_queue *txq, | |
658 | void *_unused) | |
659 | { | |
660 | lockdep_set_class(&txq->_xmit_lock, &bt_netdev_xmit_lock_key); | |
661 | } | |
662 | ||
663 | static int bt_dev_init(struct net_device *dev) | |
664 | { | |
665 | netdev_for_each_tx_queue(dev, bt_set_lockdep_class_one, NULL); | |
666 | dev->qdisc_tx_busylock = &bt_tx_busylock; | |
667 | ||
668 | return 0; | |
669 | } | |
670 | ||
18722c24 | 671 | static const struct net_device_ops netdev_ops = { |
df092306 | 672 | .ndo_init = bt_dev_init, |
18722c24 JR |
673 | .ndo_start_xmit = bt_xmit, |
674 | }; | |
675 | ||
676 | static struct header_ops header_ops = { | |
677 | .create = header_create, | |
678 | }; | |
679 | ||
680 | static void netdev_setup(struct net_device *dev) | |
681 | { | |
682 | dev->addr_len = EUI64_ADDR_LEN; | |
683 | dev->type = ARPHRD_6LOWPAN; | |
684 | ||
685 | dev->hard_header_len = 0; | |
686 | dev->needed_tailroom = 0; | |
687 | dev->mtu = IPV6_MIN_MTU; | |
688 | dev->tx_queue_len = 0; | |
156395c9 JR |
689 | dev->flags = IFF_RUNNING | IFF_POINTOPOINT | |
690 | IFF_MULTICAST; | |
18722c24 JR |
691 | dev->watchdog_timeo = 0; |
692 | ||
693 | dev->netdev_ops = &netdev_ops; | |
694 | dev->header_ops = &header_ops; | |
695 | dev->destructor = free_netdev; | |
696 | } | |
697 | ||
698 | static struct device_type bt_type = { | |
699 | .name = "bluetooth", | |
700 | }; | |
701 | ||
702 | static void set_addr(u8 *eui, u8 *addr, u8 addr_type) | |
703 | { | |
704 | /* addr is the BT address in little-endian format */ | |
705 | eui[0] = addr[5]; | |
706 | eui[1] = addr[4]; | |
707 | eui[2] = addr[3]; | |
708 | eui[3] = 0xFF; | |
709 | eui[4] = 0xFE; | |
710 | eui[5] = addr[2]; | |
711 | eui[6] = addr[1]; | |
712 | eui[7] = addr[0]; | |
713 | ||
62bbd5b3 | 714 | /* Universal/local bit set, BT 6lowpan draft ch. 3.2.1 */ |
6b8d4a6a | 715 | if (addr_type == BDADDR_LE_PUBLIC) |
62bbd5b3 | 716 | eui[0] &= ~0x02; |
18722c24 | 717 | else |
62bbd5b3 JR |
718 | eui[0] |= 0x02; |
719 | ||
720 | BT_DBG("type %d addr %*phC", addr_type, 8, eui); | |
18722c24 JR |
721 | } |
722 | ||
723 | static void set_dev_addr(struct net_device *netdev, bdaddr_t *addr, | |
724 | u8 addr_type) | |
725 | { | |
726 | netdev->addr_assign_type = NET_ADDR_PERM; | |
727 | set_addr(netdev->dev_addr, addr->b, addr_type); | |
18722c24 JR |
728 | } |
729 | ||
730 | static void ifup(struct net_device *netdev) | |
731 | { | |
732 | int err; | |
733 | ||
734 | rtnl_lock(); | |
735 | err = dev_open(netdev); | |
736 | if (err < 0) | |
737 | BT_INFO("iface %s cannot be opened (%d)", netdev->name, err); | |
738 | rtnl_unlock(); | |
739 | } | |
740 | ||
7f118253 JR |
741 | static void ifdown(struct net_device *netdev) |
742 | { | |
743 | int err; | |
744 | ||
745 | rtnl_lock(); | |
746 | err = dev_close(netdev); | |
747 | if (err < 0) | |
748 | BT_INFO("iface %s cannot be closed (%d)", netdev->name, err); | |
749 | rtnl_unlock(); | |
750 | } | |
751 | ||
18722c24 JR |
752 | static void do_notify_peers(struct work_struct *work) |
753 | { | |
754 | struct lowpan_dev *dev = container_of(work, struct lowpan_dev, | |
755 | notify_peers.work); | |
756 | ||
757 | netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */ | |
758 | } | |
759 | ||
760 | static bool is_bt_6lowpan(struct hci_conn *hcon) | |
761 | { | |
762 | if (hcon->type != LE_LINK) | |
763 | return false; | |
764 | ||
6b8d4a6a JR |
765 | if (!psm_6lowpan) |
766 | return false; | |
767 | ||
768 | return true; | |
18722c24 JR |
769 | } |
770 | ||
6b8d4a6a JR |
771 | static struct l2cap_chan *chan_create(void) |
772 | { | |
773 | struct l2cap_chan *chan; | |
774 | ||
775 | chan = l2cap_chan_create(); | |
776 | if (!chan) | |
777 | return NULL; | |
778 | ||
779 | l2cap_chan_set_defaults(chan); | |
780 | ||
781 | chan->chan_type = L2CAP_CHAN_CONN_ORIENTED; | |
782 | chan->mode = L2CAP_MODE_LE_FLOWCTL; | |
783 | chan->omtu = 65535; | |
784 | chan->imtu = chan->omtu; | |
785 | ||
786 | return chan; | |
787 | } | |
788 | ||
789 | static struct l2cap_chan *chan_open(struct l2cap_chan *pchan) | |
790 | { | |
791 | struct l2cap_chan *chan; | |
792 | ||
793 | chan = chan_create(); | |
794 | if (!chan) | |
795 | return NULL; | |
796 | ||
797 | chan->remote_mps = chan->omtu; | |
798 | chan->mps = chan->omtu; | |
799 | ||
800 | chan->state = BT_CONNECTED; | |
801 | ||
802 | return chan; | |
803 | } | |
804 | ||
b2799cec JR |
805 | static void set_ip_addr_bits(u8 addr_type, u8 *addr) |
806 | { | |
807 | if (addr_type == BDADDR_LE_PUBLIC) | |
808 | *addr |= 0x02; | |
809 | else | |
810 | *addr &= ~0x02; | |
811 | } | |
812 | ||
6b8d4a6a JR |
813 | static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan, |
814 | struct lowpan_dev *dev) | |
18722c24 JR |
815 | { |
816 | struct lowpan_peer *peer; | |
18722c24 JR |
817 | |
818 | peer = kzalloc(sizeof(*peer), GFP_ATOMIC); | |
819 | if (!peer) | |
6b8d4a6a | 820 | return NULL; |
18722c24 | 821 | |
6b8d4a6a | 822 | peer->chan = chan; |
18722c24 JR |
823 | memset(&peer->peer_addr, 0, sizeof(struct in6_addr)); |
824 | ||
825 | /* RFC 2464 ch. 5 */ | |
826 | peer->peer_addr.s6_addr[0] = 0xFE; | |
827 | peer->peer_addr.s6_addr[1] = 0x80; | |
6b8d4a6a JR |
828 | set_addr((u8 *)&peer->peer_addr.s6_addr + 8, chan->dst.b, |
829 | chan->dst_type); | |
18722c24 JR |
830 | |
831 | memcpy(&peer->eui64_addr, (u8 *)&peer->peer_addr.s6_addr + 8, | |
832 | EUI64_ADDR_LEN); | |
18722c24 | 833 | |
b2799cec JR |
834 | /* IPv6 address needs to have the U/L bit set properly so toggle |
835 | * it back here. | |
836 | */ | |
837 | set_ip_addr_bits(chan->dst_type, (u8 *)&peer->peer_addr.s6_addr + 8); | |
838 | ||
90305829 | 839 | spin_lock(&devices_lock); |
18722c24 JR |
840 | INIT_LIST_HEAD(&peer->list); |
841 | peer_add(dev, peer); | |
90305829 | 842 | spin_unlock(&devices_lock); |
18722c24 JR |
843 | |
844 | /* Notifying peers about us needs to be done without locks held */ | |
845 | INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers); | |
846 | schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100)); | |
847 | ||
6b8d4a6a | 848 | return peer->chan; |
18722c24 JR |
849 | } |
850 | ||
6b8d4a6a | 851 | static int setup_netdev(struct l2cap_chan *chan, struct lowpan_dev **dev) |
18722c24 | 852 | { |
18722c24 JR |
853 | struct net_device *netdev; |
854 | int err = 0; | |
18722c24 | 855 | |
6b8d4a6a | 856 | netdev = alloc_netdev(sizeof(struct lowpan_dev), IFACE_NAME_TEMPLATE, |
c835a677 | 857 | NET_NAME_UNKNOWN, netdev_setup); |
18722c24 JR |
858 | if (!netdev) |
859 | return -ENOMEM; | |
860 | ||
6b8d4a6a | 861 | set_dev_addr(netdev, &chan->src, chan->src_type); |
18722c24 JR |
862 | |
863 | netdev->netdev_ops = &netdev_ops; | |
6b8d4a6a | 864 | SET_NETDEV_DEV(netdev, &chan->conn->hcon->dev); |
18722c24 JR |
865 | SET_NETDEV_DEVTYPE(netdev, &bt_type); |
866 | ||
867 | err = register_netdev(netdev); | |
868 | if (err < 0) { | |
869 | BT_INFO("register_netdev failed %d", err); | |
870 | free_netdev(netdev); | |
871 | goto out; | |
872 | } | |
873 | ||
6b8d4a6a JR |
874 | BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d", |
875 | netdev->ifindex, &chan->dst, chan->dst_type, | |
876 | &chan->src, chan->src_type); | |
18722c24 JR |
877 | set_bit(__LINK_STATE_PRESENT, &netdev->state); |
878 | ||
6b8d4a6a JR |
879 | *dev = netdev_priv(netdev); |
880 | (*dev)->netdev = netdev; | |
881 | (*dev)->hdev = chan->conn->hcon->hdev; | |
882 | INIT_LIST_HEAD(&(*dev)->peers); | |
18722c24 | 883 | |
90305829 | 884 | spin_lock(&devices_lock); |
6b8d4a6a | 885 | INIT_LIST_HEAD(&(*dev)->list); |
90305829 JR |
886 | list_add_rcu(&(*dev)->list, &bt_6lowpan_devices); |
887 | spin_unlock(&devices_lock); | |
18722c24 | 888 | |
6b8d4a6a | 889 | return 0; |
18722c24 JR |
890 | |
891 | out: | |
892 | return err; | |
893 | } | |
894 | ||
6b8d4a6a JR |
895 | static inline void chan_ready_cb(struct l2cap_chan *chan) |
896 | { | |
897 | struct lowpan_dev *dev; | |
898 | ||
899 | dev = lookup_dev(chan->conn); | |
900 | ||
901 | BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev); | |
902 | ||
903 | if (!dev) { | |
904 | if (setup_netdev(chan, &dev) < 0) { | |
905 | l2cap_chan_del(chan, -ENOENT); | |
906 | return; | |
907 | } | |
908 | } | |
909 | ||
18d93c17 JR |
910 | if (!try_module_get(THIS_MODULE)) |
911 | return; | |
912 | ||
6b8d4a6a JR |
913 | add_peer_chan(chan, dev); |
914 | ifup(dev->netdev); | |
915 | } | |
916 | ||
2b293490 | 917 | static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan) |
6b8d4a6a | 918 | { |
2b293490 | 919 | struct l2cap_chan *chan; |
6b8d4a6a | 920 | |
2b293490 JH |
921 | chan = chan_open(pchan); |
922 | chan->ops = pchan->ops; | |
6b8d4a6a JR |
923 | |
924 | BT_DBG("chan %p pchan %p", chan, pchan); | |
925 | ||
2b293490 | 926 | return chan; |
6b8d4a6a JR |
927 | } |
928 | ||
18722c24 JR |
929 | static void delete_netdev(struct work_struct *work) |
930 | { | |
931 | struct lowpan_dev *entry = container_of(work, struct lowpan_dev, | |
932 | delete_netdev); | |
933 | ||
934 | unregister_netdev(entry->netdev); | |
935 | ||
936 | /* The entry pointer is deleted in device_event() */ | |
937 | } | |
938 | ||
6b8d4a6a | 939 | static void chan_close_cb(struct l2cap_chan *chan) |
18722c24 | 940 | { |
90305829 | 941 | struct lowpan_dev *entry; |
18722c24 JR |
942 | struct lowpan_dev *dev = NULL; |
943 | struct lowpan_peer *peer; | |
944 | int err = -ENOENT; | |
6b8d4a6a | 945 | bool last = false, removed = true; |
18722c24 | 946 | |
6b8d4a6a JR |
947 | BT_DBG("chan %p conn %p", chan, chan->conn); |
948 | ||
949 | if (chan->conn && chan->conn->hcon) { | |
950 | if (!is_bt_6lowpan(chan->conn->hcon)) | |
951 | return; | |
952 | ||
953 | /* If conn is set, then the netdev is also there and we should | |
954 | * not remove it. | |
955 | */ | |
956 | removed = false; | |
957 | } | |
18722c24 | 958 | |
90305829 | 959 | spin_lock(&devices_lock); |
18722c24 | 960 | |
90305829 | 961 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
18722c24 | 962 | dev = lowpan_dev(entry->netdev); |
90305829 | 963 | peer = __peer_lookup_chan(dev, chan); |
18722c24 JR |
964 | if (peer) { |
965 | last = peer_del(dev, peer); | |
966 | err = 0; | |
6b8d4a6a JR |
967 | |
968 | BT_DBG("dev %p removing %speer %p", dev, | |
969 | last ? "last " : "1 ", peer); | |
970 | BT_DBG("chan %p orig refcnt %d", chan, | |
971 | atomic_read(&chan->kref.refcount)); | |
972 | ||
973 | l2cap_chan_put(chan); | |
18722c24 JR |
974 | break; |
975 | } | |
976 | } | |
977 | ||
978 | if (!err && last && dev && !atomic_read(&dev->peer_count)) { | |
90305829 | 979 | spin_unlock(&devices_lock); |
18722c24 JR |
980 | |
981 | cancel_delayed_work_sync(&dev->notify_peers); | |
982 | ||
7f118253 JR |
983 | ifdown(dev->netdev); |
984 | ||
6b8d4a6a JR |
985 | if (!removed) { |
986 | INIT_WORK(&entry->delete_netdev, delete_netdev); | |
987 | schedule_work(&entry->delete_netdev); | |
988 | } | |
18722c24 | 989 | } else { |
90305829 | 990 | spin_unlock(&devices_lock); |
18722c24 JR |
991 | } |
992 | ||
6b8d4a6a JR |
993 | return; |
994 | } | |
995 | ||
996 | static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err) | |
997 | { | |
998 | BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn, | |
999 | state_to_string(state), err); | |
1000 | } | |
1001 | ||
1002 | static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan, | |
1003 | unsigned long hdr_len, | |
1004 | unsigned long len, int nb) | |
1005 | { | |
1006 | /* Note that we must allocate using GFP_ATOMIC here as | |
1007 | * this function is called originally from netdev hard xmit | |
1008 | * function in atomic context. | |
1009 | */ | |
1010 | return bt_skb_alloc(hdr_len + len, GFP_ATOMIC); | |
1011 | } | |
1012 | ||
1013 | static void chan_suspend_cb(struct l2cap_chan *chan) | |
1014 | { | |
1015 | struct sk_buff *skb = chan->data; | |
1016 | ||
1017 | BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb); | |
1018 | ||
59790aa2 JR |
1019 | if (!skb) |
1020 | return; | |
1021 | ||
6b8d4a6a JR |
1022 | lowpan_cb(skb)->status = -EAGAIN; |
1023 | } | |
1024 | ||
1025 | static void chan_resume_cb(struct l2cap_chan *chan) | |
1026 | { | |
1027 | struct sk_buff *skb = chan->data; | |
1028 | ||
1029 | BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb); | |
1030 | ||
59790aa2 JR |
1031 | if (!skb) |
1032 | return; | |
1033 | ||
6b8d4a6a JR |
1034 | lowpan_cb(skb)->status = 0; |
1035 | } | |
1036 | ||
1037 | static long chan_get_sndtimeo_cb(struct l2cap_chan *chan) | |
1038 | { | |
2ae50d8d | 1039 | return L2CAP_CONN_TIMEOUT; |
6b8d4a6a JR |
1040 | } |
1041 | ||
1042 | static const struct l2cap_ops bt_6lowpan_chan_ops = { | |
1043 | .name = "L2CAP 6LoWPAN channel", | |
1044 | .new_connection = chan_new_conn_cb, | |
1045 | .recv = chan_recv_cb, | |
1046 | .close = chan_close_cb, | |
1047 | .state_change = chan_state_change_cb, | |
1048 | .ready = chan_ready_cb, | |
1049 | .resume = chan_resume_cb, | |
1050 | .suspend = chan_suspend_cb, | |
1051 | .get_sndtimeo = chan_get_sndtimeo_cb, | |
1052 | .alloc_skb = chan_alloc_skb_cb, | |
1053 | .memcpy_fromiovec = l2cap_chan_no_memcpy_fromiovec, | |
1054 | ||
1055 | .teardown = l2cap_chan_no_teardown, | |
1056 | .defer = l2cap_chan_no_defer, | |
1057 | .set_shutdown = l2cap_chan_no_set_shutdown, | |
1058 | }; | |
1059 | ||
1060 | static inline __u8 bdaddr_type(__u8 type) | |
1061 | { | |
1062 | if (type == ADDR_LE_DEV_PUBLIC) | |
1063 | return BDADDR_LE_PUBLIC; | |
1064 | else | |
1065 | return BDADDR_LE_RANDOM; | |
1066 | } | |
1067 | ||
1068 | static struct l2cap_chan *chan_get(void) | |
1069 | { | |
1070 | struct l2cap_chan *pchan; | |
1071 | ||
1072 | pchan = chan_create(); | |
1073 | if (!pchan) | |
1074 | return NULL; | |
1075 | ||
1076 | pchan->ops = &bt_6lowpan_chan_ops; | |
1077 | ||
1078 | return pchan; | |
1079 | } | |
1080 | ||
1081 | static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type) | |
1082 | { | |
1083 | struct l2cap_chan *pchan; | |
1084 | int err; | |
1085 | ||
1086 | pchan = chan_get(); | |
1087 | if (!pchan) | |
1088 | return -EINVAL; | |
1089 | ||
1090 | err = l2cap_chan_connect(pchan, cpu_to_le16(psm_6lowpan), 0, | |
1091 | addr, dst_type); | |
1092 | ||
1093 | BT_DBG("chan %p err %d", pchan, err); | |
1094 | if (err < 0) | |
1095 | l2cap_chan_put(pchan); | |
1096 | ||
18722c24 JR |
1097 | return err; |
1098 | } | |
1099 | ||
6b8d4a6a JR |
1100 | static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type) |
1101 | { | |
1102 | struct lowpan_peer *peer; | |
1103 | ||
1104 | BT_DBG("conn %p dst type %d", conn, dst_type); | |
1105 | ||
1106 | peer = lookup_peer(conn); | |
1107 | if (!peer) | |
1108 | return -ENOENT; | |
1109 | ||
1110 | BT_DBG("peer %p chan %p", peer, peer->chan); | |
1111 | ||
1112 | l2cap_chan_close(peer->chan, ENOENT); | |
1113 | ||
1114 | return 0; | |
1115 | } | |
1116 | ||
1117 | static struct l2cap_chan *bt_6lowpan_listen(void) | |
1118 | { | |
1119 | bdaddr_t *addr = BDADDR_ANY; | |
1120 | struct l2cap_chan *pchan; | |
1121 | int err; | |
1122 | ||
1123 | if (psm_6lowpan == 0) | |
1124 | return NULL; | |
1125 | ||
1126 | pchan = chan_get(); | |
1127 | if (!pchan) | |
1128 | return NULL; | |
1129 | ||
1130 | pchan->state = BT_LISTEN; | |
1131 | pchan->src_type = BDADDR_LE_PUBLIC; | |
1132 | ||
2773b024 JH |
1133 | atomic_set(&pchan->nesting, L2CAP_NESTING_PARENT); |
1134 | ||
6b8d4a6a JR |
1135 | BT_DBG("psm 0x%04x chan %p src type %d", psm_6lowpan, pchan, |
1136 | pchan->src_type); | |
1137 | ||
1138 | err = l2cap_add_psm(pchan, addr, cpu_to_le16(psm_6lowpan)); | |
1139 | if (err) { | |
1140 | l2cap_chan_put(pchan); | |
1141 | BT_ERR("psm cannot be added err %d", err); | |
1142 | return NULL; | |
1143 | } | |
1144 | ||
1145 | return pchan; | |
1146 | } | |
1147 | ||
1148 | static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type, | |
1149 | struct l2cap_conn **conn) | |
1150 | { | |
1151 | struct hci_conn *hcon; | |
1152 | struct hci_dev *hdev; | |
1153 | bdaddr_t *src = BDADDR_ANY; | |
1154 | int n; | |
1155 | ||
1156 | n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu", | |
1157 | &addr->b[5], &addr->b[4], &addr->b[3], | |
1158 | &addr->b[2], &addr->b[1], &addr->b[0], | |
1159 | addr_type); | |
1160 | ||
1161 | if (n < 7) | |
1162 | return -EINVAL; | |
1163 | ||
1164 | hdev = hci_get_route(addr, src); | |
1165 | if (!hdev) | |
1166 | return -ENOENT; | |
1167 | ||
1168 | hci_dev_lock(hdev); | |
1169 | hcon = hci_conn_hash_lookup_ba(hdev, LE_LINK, addr); | |
1170 | hci_dev_unlock(hdev); | |
1171 | ||
1172 | if (!hcon) | |
1173 | return -ENOENT; | |
1174 | ||
1175 | *conn = (struct l2cap_conn *)hcon->l2cap_data; | |
1176 | ||
1177 | BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type); | |
1178 | ||
1179 | return 0; | |
1180 | } | |
1181 | ||
1182 | static void disconnect_all_peers(void) | |
1183 | { | |
90305829 | 1184 | struct lowpan_dev *entry; |
6b8d4a6a JR |
1185 | struct lowpan_peer *peer, *tmp_peer, *new_peer; |
1186 | struct list_head peers; | |
6b8d4a6a JR |
1187 | |
1188 | INIT_LIST_HEAD(&peers); | |
1189 | ||
1190 | /* We make a separate list of peers as the close_cb() will | |
1191 | * modify the device peers list so it is better not to mess | |
1192 | * with the same list at the same time. | |
1193 | */ | |
1194 | ||
90305829 | 1195 | rcu_read_lock(); |
6b8d4a6a | 1196 | |
90305829 JR |
1197 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
1198 | list_for_each_entry_rcu(peer, &entry->peers, list) { | |
6b8d4a6a JR |
1199 | new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC); |
1200 | if (!new_peer) | |
1201 | break; | |
1202 | ||
1203 | new_peer->chan = peer->chan; | |
1204 | INIT_LIST_HEAD(&new_peer->list); | |
1205 | ||
1206 | list_add(&new_peer->list, &peers); | |
1207 | } | |
1208 | } | |
1209 | ||
90305829 | 1210 | rcu_read_unlock(); |
6b8d4a6a | 1211 | |
90305829 | 1212 | spin_lock(&devices_lock); |
6b8d4a6a JR |
1213 | list_for_each_entry_safe(peer, tmp_peer, &peers, list) { |
1214 | l2cap_chan_close(peer->chan, ENOENT); | |
90305829 JR |
1215 | |
1216 | list_del_rcu(&peer->list); | |
4e790226 | 1217 | kfree_rcu(peer, rcu); |
90305829 JR |
1218 | |
1219 | module_put(THIS_MODULE); | |
6b8d4a6a | 1220 | } |
90305829 | 1221 | spin_unlock(&devices_lock); |
6b8d4a6a JR |
1222 | } |
1223 | ||
90305829 JR |
1224 | struct set_psm { |
1225 | struct work_struct work; | |
6b8d4a6a | 1226 | u16 psm; |
90305829 | 1227 | }; |
6b8d4a6a | 1228 | |
90305829 JR |
1229 | static void do_psm_set(struct work_struct *work) |
1230 | { | |
1231 | struct set_psm *set_psm = container_of(work, struct set_psm, work); | |
1232 | ||
1233 | if (set_psm->psm == 0 || psm_6lowpan != set_psm->psm) | |
6b8d4a6a JR |
1234 | /* Disconnect existing connections if 6lowpan is |
1235 | * disabled (psm = 0), or if psm changes. | |
1236 | */ | |
1237 | disconnect_all_peers(); | |
1238 | ||
90305829 | 1239 | psm_6lowpan = set_psm->psm; |
6b8d4a6a JR |
1240 | |
1241 | if (listen_chan) { | |
1242 | l2cap_chan_close(listen_chan, 0); | |
1243 | l2cap_chan_put(listen_chan); | |
1244 | } | |
1245 | ||
1246 | listen_chan = bt_6lowpan_listen(); | |
1247 | ||
90305829 JR |
1248 | kfree(set_psm); |
1249 | } | |
1250 | ||
1251 | static int lowpan_psm_set(void *data, u64 val) | |
1252 | { | |
1253 | struct set_psm *set_psm; | |
1254 | ||
1255 | set_psm = kzalloc(sizeof(*set_psm), GFP_KERNEL); | |
1256 | if (!set_psm) | |
1257 | return -ENOMEM; | |
1258 | ||
1259 | set_psm->psm = val; | |
1260 | INIT_WORK(&set_psm->work, do_psm_set); | |
1261 | ||
1262 | schedule_work(&set_psm->work); | |
1263 | ||
6b8d4a6a JR |
1264 | return 0; |
1265 | } | |
1266 | ||
1267 | static int lowpan_psm_get(void *data, u64 *val) | |
1268 | { | |
1269 | *val = psm_6lowpan; | |
1270 | return 0; | |
1271 | } | |
1272 | ||
1273 | DEFINE_SIMPLE_ATTRIBUTE(lowpan_psm_fops, lowpan_psm_get, | |
1274 | lowpan_psm_set, "%llu\n"); | |
1275 | ||
1276 | static ssize_t lowpan_control_write(struct file *fp, | |
1277 | const char __user *user_buffer, | |
1278 | size_t count, | |
1279 | loff_t *position) | |
1280 | { | |
1281 | char buf[32]; | |
1282 | size_t buf_size = min(count, sizeof(buf) - 1); | |
1283 | int ret; | |
1284 | bdaddr_t addr; | |
1285 | u8 addr_type; | |
1286 | struct l2cap_conn *conn = NULL; | |
1287 | ||
1288 | if (copy_from_user(buf, user_buffer, buf_size)) | |
1289 | return -EFAULT; | |
1290 | ||
1291 | buf[buf_size] = '\0'; | |
1292 | ||
1293 | if (memcmp(buf, "connect ", 8) == 0) { | |
1294 | ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn); | |
1295 | if (ret == -EINVAL) | |
1296 | return ret; | |
1297 | ||
1298 | if (listen_chan) { | |
1299 | l2cap_chan_close(listen_chan, 0); | |
1300 | l2cap_chan_put(listen_chan); | |
1301 | listen_chan = NULL; | |
1302 | } | |
1303 | ||
1304 | if (conn) { | |
1305 | struct lowpan_peer *peer; | |
1306 | ||
1307 | if (!is_bt_6lowpan(conn->hcon)) | |
1308 | return -EINVAL; | |
1309 | ||
1310 | peer = lookup_peer(conn); | |
1311 | if (peer) { | |
1312 | BT_DBG("6LoWPAN connection already exists"); | |
1313 | return -EALREADY; | |
1314 | } | |
1315 | ||
1316 | BT_DBG("conn %p dst %pMR type %d user %d", conn, | |
1317 | &conn->hcon->dst, conn->hcon->dst_type, | |
1318 | addr_type); | |
1319 | } | |
1320 | ||
1321 | ret = bt_6lowpan_connect(&addr, addr_type); | |
1322 | if (ret < 0) | |
1323 | return ret; | |
1324 | ||
1325 | return count; | |
1326 | } | |
1327 | ||
1328 | if (memcmp(buf, "disconnect ", 11) == 0) { | |
1329 | ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn); | |
1330 | if (ret < 0) | |
1331 | return ret; | |
1332 | ||
1333 | ret = bt_6lowpan_disconnect(conn, addr_type); | |
1334 | if (ret < 0) | |
1335 | return ret; | |
1336 | ||
1337 | return count; | |
1338 | } | |
1339 | ||
1340 | return count; | |
1341 | } | |
1342 | ||
1343 | static int lowpan_control_show(struct seq_file *f, void *ptr) | |
1344 | { | |
90305829 JR |
1345 | struct lowpan_dev *entry; |
1346 | struct lowpan_peer *peer; | |
6b8d4a6a | 1347 | |
90305829 | 1348 | spin_lock(&devices_lock); |
6b8d4a6a | 1349 | |
90305829 JR |
1350 | list_for_each_entry(entry, &bt_6lowpan_devices, list) { |
1351 | list_for_each_entry(peer, &entry->peers, list) | |
6b8d4a6a JR |
1352 | seq_printf(f, "%pMR (type %u)\n", |
1353 | &peer->chan->dst, peer->chan->dst_type); | |
1354 | } | |
1355 | ||
90305829 | 1356 | spin_unlock(&devices_lock); |
6b8d4a6a JR |
1357 | |
1358 | return 0; | |
1359 | } | |
1360 | ||
1361 | static int lowpan_control_open(struct inode *inode, struct file *file) | |
1362 | { | |
1363 | return single_open(file, lowpan_control_show, inode->i_private); | |
1364 | } | |
1365 | ||
1366 | static const struct file_operations lowpan_control_fops = { | |
1367 | .open = lowpan_control_open, | |
1368 | .read = seq_read, | |
1369 | .write = lowpan_control_write, | |
1370 | .llseek = seq_lseek, | |
1371 | .release = single_release, | |
1372 | }; | |
1373 | ||
7f118253 JR |
1374 | static void disconnect_devices(void) |
1375 | { | |
daac197c | 1376 | struct lowpan_dev *entry, *tmp, *new_dev; |
7f118253 | 1377 | struct list_head devices; |
7f118253 JR |
1378 | |
1379 | INIT_LIST_HEAD(&devices); | |
1380 | ||
1381 | /* We make a separate list of devices because the unregister_netdev() | |
1382 | * will call device_event() which will also want to modify the same | |
1383 | * devices list. | |
1384 | */ | |
1385 | ||
90305829 | 1386 | rcu_read_lock(); |
7f118253 | 1387 | |
90305829 | 1388 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
7f118253 JR |
1389 | new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC); |
1390 | if (!new_dev) | |
1391 | break; | |
1392 | ||
1393 | new_dev->netdev = entry->netdev; | |
1394 | INIT_LIST_HEAD(&new_dev->list); | |
1395 | ||
90305829 | 1396 | list_add_rcu(&new_dev->list, &devices); |
7f118253 JR |
1397 | } |
1398 | ||
90305829 | 1399 | rcu_read_unlock(); |
7f118253 | 1400 | |
daac197c | 1401 | list_for_each_entry_safe(entry, tmp, &devices, list) { |
7f118253 JR |
1402 | ifdown(entry->netdev); |
1403 | BT_DBG("Unregistering netdev %s %p", | |
1404 | entry->netdev->name, entry->netdev); | |
1405 | unregister_netdev(entry->netdev); | |
1406 | kfree(entry); | |
1407 | } | |
1408 | } | |
1409 | ||
18722c24 JR |
1410 | static int device_event(struct notifier_block *unused, |
1411 | unsigned long event, void *ptr) | |
1412 | { | |
1413 | struct net_device *netdev = netdev_notifier_info_to_dev(ptr); | |
90305829 | 1414 | struct lowpan_dev *entry; |
18722c24 JR |
1415 | |
1416 | if (netdev->type != ARPHRD_6LOWPAN) | |
1417 | return NOTIFY_DONE; | |
1418 | ||
1419 | switch (event) { | |
1420 | case NETDEV_UNREGISTER: | |
90305829 JR |
1421 | spin_lock(&devices_lock); |
1422 | list_for_each_entry(entry, &bt_6lowpan_devices, list) { | |
18722c24 | 1423 | if (entry->netdev == netdev) { |
7f118253 JR |
1424 | BT_DBG("Unregistered netdev %s %p", |
1425 | netdev->name, netdev); | |
18722c24 JR |
1426 | list_del(&entry->list); |
1427 | kfree(entry); | |
1428 | break; | |
1429 | } | |
1430 | } | |
90305829 | 1431 | spin_unlock(&devices_lock); |
18722c24 JR |
1432 | break; |
1433 | } | |
1434 | ||
1435 | return NOTIFY_DONE; | |
1436 | } | |
1437 | ||
1438 | static struct notifier_block bt_6lowpan_dev_notifier = { | |
1439 | .notifier_call = device_event, | |
1440 | }; | |
1441 | ||
5547e48c | 1442 | static int __init bt_6lowpan_init(void) |
18722c24 | 1443 | { |
6b8d4a6a JR |
1444 | lowpan_psm_debugfs = debugfs_create_file("6lowpan_psm", 0644, |
1445 | bt_debugfs, NULL, | |
1446 | &lowpan_psm_fops); | |
1447 | lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644, | |
1448 | bt_debugfs, NULL, | |
1449 | &lowpan_control_fops); | |
1450 | ||
18722c24 JR |
1451 | return register_netdevice_notifier(&bt_6lowpan_dev_notifier); |
1452 | } | |
1453 | ||
5547e48c | 1454 | static void __exit bt_6lowpan_exit(void) |
18722c24 | 1455 | { |
6b8d4a6a JR |
1456 | debugfs_remove(lowpan_psm_debugfs); |
1457 | debugfs_remove(lowpan_control_debugfs); | |
1458 | ||
1459 | if (listen_chan) { | |
1460 | l2cap_chan_close(listen_chan, 0); | |
1461 | l2cap_chan_put(listen_chan); | |
1462 | } | |
1463 | ||
7f118253 JR |
1464 | disconnect_devices(); |
1465 | ||
18722c24 JR |
1466 | unregister_netdevice_notifier(&bt_6lowpan_dev_notifier); |
1467 | } | |
5547e48c JR |
1468 | |
1469 | module_init(bt_6lowpan_init); | |
1470 | module_exit(bt_6lowpan_exit); | |
1471 | ||
1472 | MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>"); | |
1473 | MODULE_DESCRIPTION("Bluetooth 6LoWPAN"); | |
1474 | MODULE_VERSION(VERSION); | |
1475 | MODULE_LICENSE("GPL"); |