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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 | ||
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 | ||
7b2ed60e | 34 | static struct dentry *lowpan_enable_debugfs; |
6b8d4a6a JR |
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 | |
7b2ed60e | 58 | static bool enable_6lowpan; |
6b8d4a6a JR |
59 | |
60 | /* We are listening incoming connections via this channel | |
61 | */ | |
62 | static struct l2cap_chan *listen_chan; | |
63 | ||
18722c24 JR |
64 | struct lowpan_peer { |
65 | struct list_head list; | |
90305829 | 66 | struct rcu_head rcu; |
6b8d4a6a | 67 | struct l2cap_chan *chan; |
18722c24 JR |
68 | |
69 | /* peer addresses in various formats */ | |
70 | unsigned char eui64_addr[EUI64_ADDR_LEN]; | |
71 | struct in6_addr peer_addr; | |
72 | }; | |
73 | ||
74 | struct lowpan_dev { | |
75 | struct list_head list; | |
76 | ||
77 | struct hci_dev *hdev; | |
78 | struct net_device *netdev; | |
79 | struct list_head peers; | |
80 | atomic_t peer_count; /* number of items in peers list */ | |
81 | ||
82 | struct work_struct delete_netdev; | |
83 | struct delayed_work notify_peers; | |
84 | }; | |
85 | ||
86 | static inline struct lowpan_dev *lowpan_dev(const struct net_device *netdev) | |
87 | { | |
b72f6f51 | 88 | return (struct lowpan_dev *)lowpan_priv(netdev)->priv; |
18722c24 JR |
89 | } |
90 | ||
91 | static inline void peer_add(struct lowpan_dev *dev, struct lowpan_peer *peer) | |
92 | { | |
90305829 | 93 | list_add_rcu(&peer->list, &dev->peers); |
18722c24 JR |
94 | atomic_inc(&dev->peer_count); |
95 | } | |
96 | ||
97 | static inline bool peer_del(struct lowpan_dev *dev, struct lowpan_peer *peer) | |
98 | { | |
90305829 | 99 | list_del_rcu(&peer->list); |
4e790226 | 100 | kfree_rcu(peer, rcu); |
18722c24 | 101 | |
18d93c17 JR |
102 | module_put(THIS_MODULE); |
103 | ||
18722c24 JR |
104 | if (atomic_dec_and_test(&dev->peer_count)) { |
105 | BT_DBG("last peer"); | |
106 | return true; | |
107 | } | |
108 | ||
109 | return false; | |
110 | } | |
111 | ||
112 | static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_dev *dev, | |
113 | bdaddr_t *ba, __u8 type) | |
114 | { | |
90305829 | 115 | struct lowpan_peer *peer; |
18722c24 JR |
116 | |
117 | BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count), | |
118 | ba, type); | |
119 | ||
90305829 JR |
120 | rcu_read_lock(); |
121 | ||
122 | list_for_each_entry_rcu(peer, &dev->peers, list) { | |
6b8d4a6a JR |
123 | BT_DBG("dst addr %pMR dst type %d", |
124 | &peer->chan->dst, peer->chan->dst_type); | |
18722c24 | 125 | |
6b8d4a6a | 126 | if (bacmp(&peer->chan->dst, ba)) |
18722c24 JR |
127 | continue; |
128 | ||
90305829 JR |
129 | if (type == peer->chan->dst_type) { |
130 | rcu_read_unlock(); | |
6b8d4a6a | 131 | return peer; |
90305829 | 132 | } |
6b8d4a6a JR |
133 | } |
134 | ||
90305829 JR |
135 | rcu_read_unlock(); |
136 | ||
6b8d4a6a JR |
137 | return NULL; |
138 | } | |
139 | ||
90305829 JR |
140 | static inline struct lowpan_peer *__peer_lookup_chan(struct lowpan_dev *dev, |
141 | struct l2cap_chan *chan) | |
6b8d4a6a | 142 | { |
90305829 | 143 | struct lowpan_peer *peer; |
6b8d4a6a | 144 | |
90305829 | 145 | list_for_each_entry_rcu(peer, &dev->peers, list) { |
6b8d4a6a | 146 | if (peer->chan == chan) |
18722c24 JR |
147 | return peer; |
148 | } | |
149 | ||
150 | return NULL; | |
151 | } | |
152 | ||
90305829 JR |
153 | static inline struct lowpan_peer *__peer_lookup_conn(struct lowpan_dev *dev, |
154 | struct l2cap_conn *conn) | |
18722c24 | 155 | { |
90305829 | 156 | struct lowpan_peer *peer; |
18722c24 | 157 | |
90305829 | 158 | list_for_each_entry_rcu(peer, &dev->peers, list) { |
6b8d4a6a | 159 | if (peer->chan->conn == conn) |
18722c24 JR |
160 | return peer; |
161 | } | |
162 | ||
163 | return NULL; | |
164 | } | |
165 | ||
39e90c77 JR |
166 | static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_dev *dev, |
167 | struct in6_addr *daddr, | |
168 | struct sk_buff *skb) | |
169 | { | |
90305829 | 170 | struct lowpan_peer *peer; |
39e90c77 JR |
171 | struct in6_addr *nexthop; |
172 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); | |
173 | int count = atomic_read(&dev->peer_count); | |
174 | ||
175 | BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt); | |
176 | ||
177 | /* If we have multiple 6lowpan peers, then check where we should | |
178 | * send the packet. If only one peer exists, then we can send the | |
179 | * packet right away. | |
180 | */ | |
90305829 JR |
181 | if (count == 1) { |
182 | rcu_read_lock(); | |
183 | peer = list_first_or_null_rcu(&dev->peers, struct lowpan_peer, | |
184 | list); | |
185 | rcu_read_unlock(); | |
186 | return peer; | |
187 | } | |
39e90c77 JR |
188 | |
189 | if (!rt) { | |
190 | nexthop = &lowpan_cb(skb)->gw; | |
191 | ||
192 | if (ipv6_addr_any(nexthop)) | |
193 | return NULL; | |
194 | } else { | |
2647a9b0 | 195 | nexthop = rt6_nexthop(rt, daddr); |
39e90c77 JR |
196 | |
197 | /* We need to remember the address because it is needed | |
198 | * by bt_xmit() when sending the packet. In bt_xmit(), the | |
199 | * destination routing info is not set. | |
200 | */ | |
201 | memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr)); | |
202 | } | |
203 | ||
204 | BT_DBG("gw %pI6c", nexthop); | |
205 | ||
90305829 JR |
206 | rcu_read_lock(); |
207 | ||
208 | list_for_each_entry_rcu(peer, &dev->peers, list) { | |
39e90c77 JR |
209 | BT_DBG("dst addr %pMR dst type %d ip %pI6c", |
210 | &peer->chan->dst, peer->chan->dst_type, | |
211 | &peer->peer_addr); | |
212 | ||
90305829 JR |
213 | if (!ipv6_addr_cmp(&peer->peer_addr, nexthop)) { |
214 | rcu_read_unlock(); | |
39e90c77 | 215 | return peer; |
90305829 | 216 | } |
39e90c77 JR |
217 | } |
218 | ||
90305829 JR |
219 | rcu_read_unlock(); |
220 | ||
39e90c77 JR |
221 | return NULL; |
222 | } | |
223 | ||
18722c24 JR |
224 | static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn) |
225 | { | |
90305829 | 226 | struct lowpan_dev *entry; |
18722c24 | 227 | struct lowpan_peer *peer = NULL; |
18722c24 | 228 | |
90305829 | 229 | rcu_read_lock(); |
18722c24 | 230 | |
90305829 JR |
231 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
232 | peer = __peer_lookup_conn(entry, conn); | |
18722c24 JR |
233 | if (peer) |
234 | break; | |
235 | } | |
236 | ||
90305829 | 237 | rcu_read_unlock(); |
18722c24 JR |
238 | |
239 | return peer; | |
240 | } | |
241 | ||
242 | static struct lowpan_dev *lookup_dev(struct l2cap_conn *conn) | |
243 | { | |
90305829 | 244 | struct lowpan_dev *entry; |
18722c24 | 245 | struct lowpan_dev *dev = NULL; |
18722c24 | 246 | |
90305829 | 247 | rcu_read_lock(); |
18722c24 | 248 | |
90305829 | 249 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
18722c24 JR |
250 | if (conn->hcon->hdev == entry->hdev) { |
251 | dev = entry; | |
252 | break; | |
253 | } | |
254 | } | |
255 | ||
90305829 | 256 | rcu_read_unlock(); |
18722c24 JR |
257 | |
258 | return dev; | |
259 | } | |
260 | ||
18722c24 JR |
261 | static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev) |
262 | { | |
263 | struct sk_buff *skb_cp; | |
18722c24 JR |
264 | |
265 | skb_cp = skb_copy(skb, GFP_ATOMIC); | |
266 | if (!skb_cp) | |
f8b36176 | 267 | return NET_RX_DROP; |
18722c24 | 268 | |
4456c50d | 269 | return netif_rx(skb_cp); |
18722c24 JR |
270 | } |
271 | ||
01141234 MT |
272 | static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev, |
273 | struct l2cap_chan *chan) | |
18722c24 JR |
274 | { |
275 | const u8 *saddr, *daddr; | |
276 | u8 iphc0, iphc1; | |
277 | struct lowpan_dev *dev; | |
278 | struct lowpan_peer *peer; | |
18722c24 JR |
279 | |
280 | dev = lowpan_dev(netdev); | |
281 | ||
90305829 JR |
282 | rcu_read_lock(); |
283 | peer = __peer_lookup_chan(dev, chan); | |
284 | rcu_read_unlock(); | |
18722c24 | 285 | if (!peer) |
56b2c3ee | 286 | return -EINVAL; |
18722c24 JR |
287 | |
288 | saddr = peer->eui64_addr; | |
289 | daddr = dev->netdev->dev_addr; | |
290 | ||
291 | /* at least two bytes will be used for the encoding */ | |
292 | if (skb->len < 2) | |
56b2c3ee | 293 | return -EINVAL; |
18722c24 JR |
294 | |
295 | if (lowpan_fetch_skb_u8(skb, &iphc0)) | |
56b2c3ee | 296 | return -EINVAL; |
18722c24 JR |
297 | |
298 | if (lowpan_fetch_skb_u8(skb, &iphc1)) | |
56b2c3ee | 299 | return -EINVAL; |
18722c24 | 300 | |
01141234 MT |
301 | return lowpan_header_decompress(skb, netdev, |
302 | saddr, IEEE802154_ADDR_LONG, | |
303 | EUI64_ADDR_LEN, daddr, | |
304 | IEEE802154_ADDR_LONG, EUI64_ADDR_LEN, | |
305 | iphc0, iphc1); | |
18722c24 | 306 | |
18722c24 JR |
307 | } |
308 | ||
309 | static int recv_pkt(struct sk_buff *skb, struct net_device *dev, | |
6b8d4a6a | 310 | struct l2cap_chan *chan) |
18722c24 JR |
311 | { |
312 | struct sk_buff *local_skb; | |
313 | int ret; | |
314 | ||
315 | if (!netif_running(dev)) | |
316 | goto drop; | |
317 | ||
318 | if (dev->type != ARPHRD_6LOWPAN) | |
319 | goto drop; | |
320 | ||
11e3ff70 MT |
321 | skb = skb_share_check(skb, GFP_ATOMIC); |
322 | if (!skb) | |
323 | goto drop; | |
324 | ||
18722c24 JR |
325 | /* check that it's our buffer */ |
326 | if (skb->data[0] == LOWPAN_DISPATCH_IPV6) { | |
327 | /* Copy the packet so that the IPv6 header is | |
328 | * properly aligned. | |
329 | */ | |
330 | local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1, | |
331 | skb_tailroom(skb), GFP_ATOMIC); | |
332 | if (!local_skb) | |
333 | goto drop; | |
334 | ||
335 | local_skb->protocol = htons(ETH_P_IPV6); | |
336 | local_skb->pkt_type = PACKET_HOST; | |
337 | ||
338 | skb_reset_network_header(local_skb); | |
339 | skb_set_transport_header(local_skb, sizeof(struct ipv6hdr)); | |
340 | ||
341 | if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) { | |
342 | kfree_skb(local_skb); | |
343 | goto drop; | |
344 | } | |
345 | ||
346 | dev->stats.rx_bytes += skb->len; | |
347 | dev->stats.rx_packets++; | |
348 | ||
3c400b84 MT |
349 | consume_skb(local_skb); |
350 | consume_skb(skb); | |
18722c24 JR |
351 | } else { |
352 | switch (skb->data[0] & 0xe0) { | |
353 | case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */ | |
354 | local_skb = skb_clone(skb, GFP_ATOMIC); | |
355 | if (!local_skb) | |
356 | goto drop; | |
357 | ||
01141234 | 358 | ret = iphc_decompress(local_skb, dev, chan); |
56b2c3ee MT |
359 | if (ret < 0) { |
360 | kfree_skb(local_skb); | |
18722c24 | 361 | goto drop; |
56b2c3ee | 362 | } |
18722c24 | 363 | |
f8b36176 MT |
364 | local_skb->protocol = htons(ETH_P_IPV6); |
365 | local_skb->pkt_type = PACKET_HOST; | |
366 | local_skb->dev = dev; | |
367 | ||
368 | if (give_skb_to_upper(local_skb, dev) | |
369 | != NET_RX_SUCCESS) { | |
370 | kfree_skb(local_skb); | |
371 | goto drop; | |
372 | } | |
373 | ||
18722c24 JR |
374 | dev->stats.rx_bytes += skb->len; |
375 | dev->stats.rx_packets++; | |
376 | ||
3c400b84 MT |
377 | consume_skb(local_skb); |
378 | consume_skb(skb); | |
18722c24 JR |
379 | break; |
380 | default: | |
381 | break; | |
382 | } | |
383 | } | |
384 | ||
385 | return NET_RX_SUCCESS; | |
386 | ||
387 | drop: | |
6b8d4a6a | 388 | dev->stats.rx_dropped++; |
18722c24 JR |
389 | return NET_RX_DROP; |
390 | } | |
391 | ||
392 | /* Packet from BT LE device */ | |
6b8d4a6a | 393 | static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
18722c24 JR |
394 | { |
395 | struct lowpan_dev *dev; | |
396 | struct lowpan_peer *peer; | |
397 | int err; | |
398 | ||
6b8d4a6a | 399 | peer = lookup_peer(chan->conn); |
18722c24 JR |
400 | if (!peer) |
401 | return -ENOENT; | |
402 | ||
6b8d4a6a | 403 | dev = lookup_dev(chan->conn); |
30d3db44 | 404 | if (!dev || !dev->netdev) |
18722c24 JR |
405 | return -ENOENT; |
406 | ||
6b8d4a6a JR |
407 | err = recv_pkt(skb, dev->netdev, chan); |
408 | if (err) { | |
409 | BT_DBG("recv pkt %d", err); | |
410 | err = -EAGAIN; | |
18722c24 JR |
411 | } |
412 | ||
6b8d4a6a | 413 | return err; |
18722c24 JR |
414 | } |
415 | ||
62bbd5b3 | 416 | static u8 get_addr_type_from_eui64(u8 byte) |
18722c24 | 417 | { |
6b8d4a6a JR |
418 | /* Is universal(0) or local(1) bit */ |
419 | return ((byte & 0x02) ? BDADDR_LE_RANDOM : BDADDR_LE_PUBLIC); | |
62bbd5b3 JR |
420 | } |
421 | ||
422 | static void copy_to_bdaddr(struct in6_addr *ip6_daddr, bdaddr_t *addr) | |
423 | { | |
424 | u8 *eui64 = ip6_daddr->s6_addr + 8; | |
18722c24 JR |
425 | |
426 | addr->b[0] = eui64[7]; | |
427 | addr->b[1] = eui64[6]; | |
428 | addr->b[2] = eui64[5]; | |
429 | addr->b[3] = eui64[2]; | |
430 | addr->b[4] = eui64[1]; | |
431 | addr->b[5] = eui64[0]; | |
62bbd5b3 | 432 | } |
18722c24 | 433 | |
62bbd5b3 JR |
434 | static void convert_dest_bdaddr(struct in6_addr *ip6_daddr, |
435 | bdaddr_t *addr, u8 *addr_type) | |
436 | { | |
437 | copy_to_bdaddr(ip6_daddr, addr); | |
18722c24 | 438 | |
62bbd5b3 JR |
439 | /* We need to toggle the U/L bit that we got from IPv6 address |
440 | * so that we get the proper address and type of the BD address. | |
441 | */ | |
442 | addr->b[5] ^= 0x02; | |
443 | ||
444 | *addr_type = get_addr_type_from_eui64(addr->b[5]); | |
18722c24 JR |
445 | } |
446 | ||
36b3dd25 JR |
447 | static int setup_header(struct sk_buff *skb, struct net_device *netdev, |
448 | bdaddr_t *peer_addr, u8 *peer_addr_type) | |
18722c24 | 449 | { |
36b3dd25 | 450 | struct in6_addr ipv6_daddr; |
18722c24 JR |
451 | struct lowpan_dev *dev; |
452 | struct lowpan_peer *peer; | |
453 | bdaddr_t addr, *any = BDADDR_ANY; | |
36b3dd25 JR |
454 | u8 *daddr = any->b; |
455 | int err, status = 0; | |
18722c24 JR |
456 | |
457 | dev = lowpan_dev(netdev); | |
458 | ||
36b3dd25 JR |
459 | memcpy(&ipv6_daddr, &lowpan_cb(skb)->addr, sizeof(ipv6_daddr)); |
460 | ||
461 | if (ipv6_addr_is_multicast(&ipv6_daddr)) { | |
6b8d4a6a | 462 | lowpan_cb(skb)->chan = NULL; |
18722c24 | 463 | } else { |
36b3dd25 | 464 | u8 addr_type; |
18722c24 JR |
465 | |
466 | /* Get destination BT device from skb. | |
467 | * If there is no such peer then discard the packet. | |
468 | */ | |
36b3dd25 | 469 | convert_dest_bdaddr(&ipv6_daddr, &addr, &addr_type); |
18722c24 | 470 | |
6b8d4a6a | 471 | BT_DBG("dest addr %pMR type %d IP %pI6c", &addr, |
36b3dd25 | 472 | addr_type, &ipv6_daddr); |
18722c24 | 473 | |
18722c24 | 474 | peer = peer_lookup_ba(dev, &addr, addr_type); |
18722c24 | 475 | if (!peer) { |
39e90c77 JR |
476 | /* The packet might be sent to 6lowpan interface |
477 | * because of routing (either via default route | |
478 | * or user set route) so get peer according to | |
479 | * the destination address. | |
480 | */ | |
36b3dd25 | 481 | peer = peer_lookup_dst(dev, &ipv6_daddr, skb); |
39e90c77 JR |
482 | if (!peer) { |
483 | BT_DBG("no such peer %pMR found", &addr); | |
484 | return -ENOENT; | |
485 | } | |
18722c24 JR |
486 | } |
487 | ||
488 | daddr = peer->eui64_addr; | |
36b3dd25 JR |
489 | *peer_addr = addr; |
490 | *peer_addr_type = addr_type; | |
6b8d4a6a | 491 | lowpan_cb(skb)->chan = peer->chan; |
36b3dd25 JR |
492 | |
493 | status = 1; | |
18722c24 JR |
494 | } |
495 | ||
36b3dd25 JR |
496 | lowpan_header_compress(skb, netdev, ETH_P_IPV6, daddr, |
497 | dev->netdev->dev_addr, skb->len); | |
498 | ||
499 | err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0); | |
500 | if (err < 0) | |
501 | return err; | |
502 | ||
503 | return status; | |
504 | } | |
505 | ||
506 | static int header_create(struct sk_buff *skb, struct net_device *netdev, | |
507 | unsigned short type, const void *_daddr, | |
508 | const void *_saddr, unsigned int len) | |
509 | { | |
510 | struct ipv6hdr *hdr; | |
511 | ||
512 | if (type != ETH_P_IPV6) | |
513 | return -EINVAL; | |
514 | ||
515 | hdr = ipv6_hdr(skb); | |
516 | ||
517 | memcpy(&lowpan_cb(skb)->addr, &hdr->daddr, sizeof(struct in6_addr)); | |
18722c24 | 518 | |
36b3dd25 | 519 | return 0; |
18722c24 JR |
520 | } |
521 | ||
522 | /* Packet to BT LE device */ | |
6b8d4a6a | 523 | static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb, |
d7b6b0a5 | 524 | struct net_device *netdev) |
18722c24 | 525 | { |
6b8d4a6a JR |
526 | struct msghdr msg; |
527 | struct kvec iv; | |
528 | int err; | |
529 | ||
530 | /* Remember the skb so that we can send EAGAIN to the caller if | |
d7b6b0a5 | 531 | * we run out of credits. |
6b8d4a6a | 532 | */ |
d7b6b0a5 | 533 | chan->data = skb; |
6b8d4a6a | 534 | |
6b8d4a6a JR |
535 | iv.iov_base = skb->data; |
536 | iv.iov_len = skb->len; | |
537 | ||
c0371da6 | 538 | memset(&msg, 0, sizeof(msg)); |
17836394 | 539 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, &iv, 1, skb->len); |
c0371da6 | 540 | |
6b8d4a6a JR |
541 | err = l2cap_chan_send(chan, &msg, skb->len); |
542 | if (err > 0) { | |
543 | netdev->stats.tx_bytes += err; | |
544 | netdev->stats.tx_packets++; | |
545 | return 0; | |
546 | } | |
547 | ||
548 | if (!err) | |
549 | err = lowpan_cb(skb)->status; | |
550 | ||
551 | if (err < 0) { | |
552 | if (err == -EAGAIN) | |
553 | netdev->stats.tx_dropped++; | |
554 | else | |
555 | netdev->stats.tx_errors++; | |
556 | } | |
18722c24 | 557 | |
6b8d4a6a | 558 | return err; |
18722c24 JR |
559 | } |
560 | ||
9c238ca8 | 561 | static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev) |
18722c24 JR |
562 | { |
563 | struct sk_buff *local_skb; | |
90305829 | 564 | struct lowpan_dev *entry; |
9c238ca8 | 565 | int err = 0; |
18722c24 | 566 | |
90305829 | 567 | rcu_read_lock(); |
18722c24 | 568 | |
90305829 JR |
569 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
570 | struct lowpan_peer *pentry; | |
18722c24 JR |
571 | struct lowpan_dev *dev; |
572 | ||
573 | if (entry->netdev != netdev) | |
574 | continue; | |
575 | ||
576 | dev = lowpan_dev(entry->netdev); | |
577 | ||
90305829 | 578 | list_for_each_entry_rcu(pentry, &dev->peers, list) { |
9c238ca8 JR |
579 | int ret; |
580 | ||
18722c24 JR |
581 | local_skb = skb_clone(skb, GFP_ATOMIC); |
582 | ||
36b3dd25 JR |
583 | BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p", |
584 | netdev->name, | |
585 | &pentry->chan->dst, pentry->chan->dst_type, | |
586 | &pentry->peer_addr, pentry->chan); | |
9c238ca8 JR |
587 | ret = send_pkt(pentry->chan, local_skb, netdev); |
588 | if (ret < 0) | |
589 | err = ret; | |
18722c24 JR |
590 | |
591 | kfree_skb(local_skb); | |
592 | } | |
593 | } | |
594 | ||
90305829 | 595 | rcu_read_unlock(); |
9c238ca8 JR |
596 | |
597 | return err; | |
18722c24 JR |
598 | } |
599 | ||
600 | static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev) | |
601 | { | |
602 | int err = 0; | |
18722c24 JR |
603 | bdaddr_t addr; |
604 | u8 addr_type; | |
605 | ||
36b3dd25 JR |
606 | /* We must take a copy of the skb before we modify/replace the ipv6 |
607 | * header as the header could be used elsewhere | |
608 | */ | |
b0c42cd7 AA |
609 | skb = skb_unshare(skb, GFP_ATOMIC); |
610 | if (!skb) | |
36b3dd25 JR |
611 | return NET_XMIT_DROP; |
612 | ||
613 | /* Return values from setup_header() | |
614 | * <0 - error, packet is dropped | |
615 | * 0 - this is a multicast packet | |
616 | * 1 - this is unicast packet | |
617 | */ | |
618 | err = setup_header(skb, netdev, &addr, &addr_type); | |
619 | if (err < 0) { | |
620 | kfree_skb(skb); | |
621 | return NET_XMIT_DROP; | |
622 | } | |
18722c24 | 623 | |
36b3dd25 JR |
624 | if (err) { |
625 | if (lowpan_cb(skb)->chan) { | |
626 | BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p", | |
627 | netdev->name, &addr, addr_type, | |
628 | &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan); | |
d7b6b0a5 | 629 | err = send_pkt(lowpan_cb(skb)->chan, skb, netdev); |
36b3dd25 | 630 | } else { |
6b8d4a6a | 631 | err = -ENOENT; |
36b3dd25 JR |
632 | } |
633 | } else { | |
634 | /* We need to send the packet to every device behind this | |
635 | * interface. | |
636 | */ | |
9c238ca8 | 637 | err = send_mcast_pkt(skb, netdev); |
18722c24 | 638 | } |
18722c24 | 639 | |
fc12518a JR |
640 | dev_kfree_skb(skb); |
641 | ||
18722c24 JR |
642 | if (err) |
643 | BT_DBG("ERROR: xmit failed (%d)", err); | |
644 | ||
36b3dd25 | 645 | return err < 0 ? NET_XMIT_DROP : err; |
18722c24 JR |
646 | } |
647 | ||
df092306 JR |
648 | static struct lock_class_key bt_tx_busylock; |
649 | static struct lock_class_key bt_netdev_xmit_lock_key; | |
650 | ||
651 | static void bt_set_lockdep_class_one(struct net_device *dev, | |
652 | struct netdev_queue *txq, | |
653 | void *_unused) | |
654 | { | |
655 | lockdep_set_class(&txq->_xmit_lock, &bt_netdev_xmit_lock_key); | |
656 | } | |
657 | ||
658 | static int bt_dev_init(struct net_device *dev) | |
659 | { | |
660 | netdev_for_each_tx_queue(dev, bt_set_lockdep_class_one, NULL); | |
661 | dev->qdisc_tx_busylock = &bt_tx_busylock; | |
662 | ||
663 | return 0; | |
664 | } | |
665 | ||
18722c24 | 666 | static const struct net_device_ops netdev_ops = { |
df092306 | 667 | .ndo_init = bt_dev_init, |
18722c24 JR |
668 | .ndo_start_xmit = bt_xmit, |
669 | }; | |
670 | ||
671 | static struct header_ops header_ops = { | |
672 | .create = header_create, | |
673 | }; | |
674 | ||
675 | static void netdev_setup(struct net_device *dev) | |
676 | { | |
677 | dev->addr_len = EUI64_ADDR_LEN; | |
678 | dev->type = ARPHRD_6LOWPAN; | |
679 | ||
680 | dev->hard_header_len = 0; | |
681 | dev->needed_tailroom = 0; | |
682 | dev->mtu = IPV6_MIN_MTU; | |
683 | dev->tx_queue_len = 0; | |
156395c9 JR |
684 | dev->flags = IFF_RUNNING | IFF_POINTOPOINT | |
685 | IFF_MULTICAST; | |
18722c24 JR |
686 | dev->watchdog_timeo = 0; |
687 | ||
688 | dev->netdev_ops = &netdev_ops; | |
689 | dev->header_ops = &header_ops; | |
690 | dev->destructor = free_netdev; | |
691 | } | |
692 | ||
693 | static struct device_type bt_type = { | |
694 | .name = "bluetooth", | |
695 | }; | |
696 | ||
697 | static void set_addr(u8 *eui, u8 *addr, u8 addr_type) | |
698 | { | |
699 | /* addr is the BT address in little-endian format */ | |
700 | eui[0] = addr[5]; | |
701 | eui[1] = addr[4]; | |
702 | eui[2] = addr[3]; | |
703 | eui[3] = 0xFF; | |
704 | eui[4] = 0xFE; | |
705 | eui[5] = addr[2]; | |
706 | eui[6] = addr[1]; | |
707 | eui[7] = addr[0]; | |
708 | ||
62bbd5b3 | 709 | /* Universal/local bit set, BT 6lowpan draft ch. 3.2.1 */ |
6b8d4a6a | 710 | if (addr_type == BDADDR_LE_PUBLIC) |
62bbd5b3 | 711 | eui[0] &= ~0x02; |
18722c24 | 712 | else |
62bbd5b3 JR |
713 | eui[0] |= 0x02; |
714 | ||
715 | BT_DBG("type %d addr %*phC", addr_type, 8, eui); | |
18722c24 JR |
716 | } |
717 | ||
718 | static void set_dev_addr(struct net_device *netdev, bdaddr_t *addr, | |
719 | u8 addr_type) | |
720 | { | |
721 | netdev->addr_assign_type = NET_ADDR_PERM; | |
722 | set_addr(netdev->dev_addr, addr->b, addr_type); | |
18722c24 JR |
723 | } |
724 | ||
725 | static void ifup(struct net_device *netdev) | |
726 | { | |
727 | int err; | |
728 | ||
729 | rtnl_lock(); | |
730 | err = dev_open(netdev); | |
731 | if (err < 0) | |
732 | BT_INFO("iface %s cannot be opened (%d)", netdev->name, err); | |
733 | rtnl_unlock(); | |
734 | } | |
735 | ||
7f118253 JR |
736 | static void ifdown(struct net_device *netdev) |
737 | { | |
738 | int err; | |
739 | ||
740 | rtnl_lock(); | |
741 | err = dev_close(netdev); | |
742 | if (err < 0) | |
743 | BT_INFO("iface %s cannot be closed (%d)", netdev->name, err); | |
744 | rtnl_unlock(); | |
745 | } | |
746 | ||
18722c24 JR |
747 | static void do_notify_peers(struct work_struct *work) |
748 | { | |
749 | struct lowpan_dev *dev = container_of(work, struct lowpan_dev, | |
750 | notify_peers.work); | |
751 | ||
752 | netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */ | |
753 | } | |
754 | ||
755 | static bool is_bt_6lowpan(struct hci_conn *hcon) | |
756 | { | |
757 | if (hcon->type != LE_LINK) | |
758 | return false; | |
759 | ||
7b2ed60e | 760 | if (!enable_6lowpan) |
6b8d4a6a JR |
761 | return false; |
762 | ||
763 | return true; | |
18722c24 JR |
764 | } |
765 | ||
6b8d4a6a JR |
766 | static struct l2cap_chan *chan_create(void) |
767 | { | |
768 | struct l2cap_chan *chan; | |
769 | ||
770 | chan = l2cap_chan_create(); | |
771 | if (!chan) | |
772 | return NULL; | |
773 | ||
774 | l2cap_chan_set_defaults(chan); | |
775 | ||
776 | chan->chan_type = L2CAP_CHAN_CONN_ORIENTED; | |
777 | chan->mode = L2CAP_MODE_LE_FLOWCTL; | |
778 | chan->omtu = 65535; | |
779 | chan->imtu = chan->omtu; | |
780 | ||
781 | return chan; | |
782 | } | |
783 | ||
784 | static struct l2cap_chan *chan_open(struct l2cap_chan *pchan) | |
785 | { | |
786 | struct l2cap_chan *chan; | |
787 | ||
788 | chan = chan_create(); | |
789 | if (!chan) | |
790 | return NULL; | |
791 | ||
792 | chan->remote_mps = chan->omtu; | |
793 | chan->mps = chan->omtu; | |
794 | ||
795 | chan->state = BT_CONNECTED; | |
796 | ||
797 | return chan; | |
798 | } | |
799 | ||
b2799cec JR |
800 | static void set_ip_addr_bits(u8 addr_type, u8 *addr) |
801 | { | |
802 | if (addr_type == BDADDR_LE_PUBLIC) | |
803 | *addr |= 0x02; | |
804 | else | |
805 | *addr &= ~0x02; | |
806 | } | |
807 | ||
6b8d4a6a JR |
808 | static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan, |
809 | struct lowpan_dev *dev) | |
18722c24 JR |
810 | { |
811 | struct lowpan_peer *peer; | |
18722c24 JR |
812 | |
813 | peer = kzalloc(sizeof(*peer), GFP_ATOMIC); | |
814 | if (!peer) | |
6b8d4a6a | 815 | return NULL; |
18722c24 | 816 | |
6b8d4a6a | 817 | peer->chan = chan; |
18722c24 JR |
818 | memset(&peer->peer_addr, 0, sizeof(struct in6_addr)); |
819 | ||
820 | /* RFC 2464 ch. 5 */ | |
821 | peer->peer_addr.s6_addr[0] = 0xFE; | |
822 | peer->peer_addr.s6_addr[1] = 0x80; | |
6b8d4a6a JR |
823 | set_addr((u8 *)&peer->peer_addr.s6_addr + 8, chan->dst.b, |
824 | chan->dst_type); | |
18722c24 JR |
825 | |
826 | memcpy(&peer->eui64_addr, (u8 *)&peer->peer_addr.s6_addr + 8, | |
827 | EUI64_ADDR_LEN); | |
18722c24 | 828 | |
b2799cec JR |
829 | /* IPv6 address needs to have the U/L bit set properly so toggle |
830 | * it back here. | |
831 | */ | |
832 | set_ip_addr_bits(chan->dst_type, (u8 *)&peer->peer_addr.s6_addr + 8); | |
833 | ||
90305829 | 834 | spin_lock(&devices_lock); |
18722c24 JR |
835 | INIT_LIST_HEAD(&peer->list); |
836 | peer_add(dev, peer); | |
90305829 | 837 | spin_unlock(&devices_lock); |
18722c24 JR |
838 | |
839 | /* Notifying peers about us needs to be done without locks held */ | |
840 | INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers); | |
841 | schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100)); | |
842 | ||
6b8d4a6a | 843 | return peer->chan; |
18722c24 JR |
844 | } |
845 | ||
6b8d4a6a | 846 | static int setup_netdev(struct l2cap_chan *chan, struct lowpan_dev **dev) |
18722c24 | 847 | { |
18722c24 JR |
848 | struct net_device *netdev; |
849 | int err = 0; | |
18722c24 | 850 | |
b72f6f51 AA |
851 | netdev = alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_dev)), |
852 | IFACE_NAME_TEMPLATE, NET_NAME_UNKNOWN, | |
853 | netdev_setup); | |
18722c24 JR |
854 | if (!netdev) |
855 | return -ENOMEM; | |
856 | ||
6b8d4a6a | 857 | set_dev_addr(netdev, &chan->src, chan->src_type); |
18722c24 JR |
858 | |
859 | netdev->netdev_ops = &netdev_ops; | |
fc84242f | 860 | SET_NETDEV_DEV(netdev, &chan->conn->hcon->hdev->dev); |
18722c24 JR |
861 | SET_NETDEV_DEVTYPE(netdev, &bt_type); |
862 | ||
a42bbba5 | 863 | *dev = lowpan_dev(netdev); |
5857d1db AA |
864 | (*dev)->netdev = netdev; |
865 | (*dev)->hdev = chan->conn->hcon->hdev; | |
866 | INIT_LIST_HEAD(&(*dev)->peers); | |
867 | ||
868 | spin_lock(&devices_lock); | |
869 | INIT_LIST_HEAD(&(*dev)->list); | |
870 | list_add_rcu(&(*dev)->list, &bt_6lowpan_devices); | |
871 | spin_unlock(&devices_lock); | |
872 | ||
b72f6f51 AA |
873 | lowpan_netdev_setup(netdev, LOWPAN_LLTYPE_BTLE); |
874 | ||
18722c24 JR |
875 | err = register_netdev(netdev); |
876 | if (err < 0) { | |
877 | BT_INFO("register_netdev failed %d", err); | |
5857d1db AA |
878 | spin_lock(&devices_lock); |
879 | list_del_rcu(&(*dev)->list); | |
880 | spin_unlock(&devices_lock); | |
18722c24 JR |
881 | free_netdev(netdev); |
882 | goto out; | |
883 | } | |
884 | ||
6b8d4a6a JR |
885 | BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d", |
886 | netdev->ifindex, &chan->dst, chan->dst_type, | |
887 | &chan->src, chan->src_type); | |
18722c24 JR |
888 | set_bit(__LINK_STATE_PRESENT, &netdev->state); |
889 | ||
6b8d4a6a | 890 | return 0; |
18722c24 JR |
891 | |
892 | out: | |
893 | return err; | |
894 | } | |
895 | ||
6b8d4a6a JR |
896 | static inline void chan_ready_cb(struct l2cap_chan *chan) |
897 | { | |
898 | struct lowpan_dev *dev; | |
899 | ||
900 | dev = lookup_dev(chan->conn); | |
901 | ||
902 | BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev); | |
903 | ||
904 | if (!dev) { | |
905 | if (setup_netdev(chan, &dev) < 0) { | |
906 | l2cap_chan_del(chan, -ENOENT); | |
907 | return; | |
908 | } | |
909 | } | |
910 | ||
18d93c17 JR |
911 | if (!try_module_get(THIS_MODULE)) |
912 | return; | |
913 | ||
6b8d4a6a JR |
914 | add_peer_chan(chan, dev); |
915 | ifup(dev->netdev); | |
916 | } | |
917 | ||
2b293490 | 918 | static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan) |
6b8d4a6a | 919 | { |
2b293490 | 920 | struct l2cap_chan *chan; |
6b8d4a6a | 921 | |
2b293490 JH |
922 | chan = chan_open(pchan); |
923 | chan->ops = pchan->ops; | |
6b8d4a6a JR |
924 | |
925 | BT_DBG("chan %p pchan %p", chan, pchan); | |
926 | ||
2b293490 | 927 | return chan; |
6b8d4a6a JR |
928 | } |
929 | ||
18722c24 JR |
930 | static void delete_netdev(struct work_struct *work) |
931 | { | |
932 | struct lowpan_dev *entry = container_of(work, struct lowpan_dev, | |
933 | delete_netdev); | |
934 | ||
935 | unregister_netdev(entry->netdev); | |
936 | ||
2ad88fb2 | 937 | /* The entry pointer is deleted by the netdev destructor. */ |
18722c24 JR |
938 | } |
939 | ||
6b8d4a6a | 940 | static void chan_close_cb(struct l2cap_chan *chan) |
18722c24 | 941 | { |
90305829 | 942 | struct lowpan_dev *entry; |
18722c24 JR |
943 | struct lowpan_dev *dev = NULL; |
944 | struct lowpan_peer *peer; | |
945 | int err = -ENOENT; | |
f63666d2 | 946 | bool last = false, remove = true; |
18722c24 | 947 | |
6b8d4a6a JR |
948 | BT_DBG("chan %p conn %p", chan, chan->conn); |
949 | ||
950 | if (chan->conn && chan->conn->hcon) { | |
951 | if (!is_bt_6lowpan(chan->conn->hcon)) | |
952 | return; | |
953 | ||
954 | /* If conn is set, then the netdev is also there and we should | |
955 | * not remove it. | |
956 | */ | |
f63666d2 | 957 | remove = false; |
6b8d4a6a | 958 | } |
18722c24 | 959 | |
90305829 | 960 | spin_lock(&devices_lock); |
18722c24 | 961 | |
90305829 | 962 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
18722c24 | 963 | dev = lowpan_dev(entry->netdev); |
90305829 | 964 | peer = __peer_lookup_chan(dev, chan); |
18722c24 JR |
965 | if (peer) { |
966 | last = peer_del(dev, peer); | |
967 | err = 0; | |
6b8d4a6a JR |
968 | |
969 | BT_DBG("dev %p removing %speer %p", dev, | |
970 | last ? "last " : "1 ", peer); | |
971 | BT_DBG("chan %p orig refcnt %d", chan, | |
972 | atomic_read(&chan->kref.refcount)); | |
973 | ||
974 | l2cap_chan_put(chan); | |
18722c24 JR |
975 | break; |
976 | } | |
977 | } | |
978 | ||
979 | if (!err && last && dev && !atomic_read(&dev->peer_count)) { | |
90305829 | 980 | spin_unlock(&devices_lock); |
18722c24 JR |
981 | |
982 | cancel_delayed_work_sync(&dev->notify_peers); | |
983 | ||
7f118253 JR |
984 | ifdown(dev->netdev); |
985 | ||
f63666d2 | 986 | if (remove) { |
6b8d4a6a JR |
987 | INIT_WORK(&entry->delete_netdev, delete_netdev); |
988 | schedule_work(&entry->delete_netdev); | |
989 | } | |
18722c24 | 990 | } else { |
90305829 | 991 | spin_unlock(&devices_lock); |
18722c24 JR |
992 | } |
993 | ||
6b8d4a6a JR |
994 | return; |
995 | } | |
996 | ||
997 | static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err) | |
998 | { | |
999 | BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn, | |
1000 | state_to_string(state), err); | |
1001 | } | |
1002 | ||
1003 | static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan, | |
1004 | unsigned long hdr_len, | |
1005 | unsigned long len, int nb) | |
1006 | { | |
1007 | /* Note that we must allocate using GFP_ATOMIC here as | |
1008 | * this function is called originally from netdev hard xmit | |
1009 | * function in atomic context. | |
1010 | */ | |
1011 | return bt_skb_alloc(hdr_len + len, GFP_ATOMIC); | |
1012 | } | |
1013 | ||
1014 | static void chan_suspend_cb(struct l2cap_chan *chan) | |
1015 | { | |
1016 | struct sk_buff *skb = chan->data; | |
1017 | ||
1018 | BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb); | |
1019 | ||
59790aa2 JR |
1020 | if (!skb) |
1021 | return; | |
1022 | ||
6b8d4a6a JR |
1023 | lowpan_cb(skb)->status = -EAGAIN; |
1024 | } | |
1025 | ||
1026 | static void chan_resume_cb(struct l2cap_chan *chan) | |
1027 | { | |
1028 | struct sk_buff *skb = chan->data; | |
1029 | ||
1030 | BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb); | |
1031 | ||
59790aa2 JR |
1032 | if (!skb) |
1033 | return; | |
1034 | ||
6b8d4a6a JR |
1035 | lowpan_cb(skb)->status = 0; |
1036 | } | |
1037 | ||
1038 | static long chan_get_sndtimeo_cb(struct l2cap_chan *chan) | |
1039 | { | |
2ae50d8d | 1040 | return L2CAP_CONN_TIMEOUT; |
6b8d4a6a JR |
1041 | } |
1042 | ||
1043 | static const struct l2cap_ops bt_6lowpan_chan_ops = { | |
1044 | .name = "L2CAP 6LoWPAN channel", | |
1045 | .new_connection = chan_new_conn_cb, | |
1046 | .recv = chan_recv_cb, | |
1047 | .close = chan_close_cb, | |
1048 | .state_change = chan_state_change_cb, | |
1049 | .ready = chan_ready_cb, | |
1050 | .resume = chan_resume_cb, | |
1051 | .suspend = chan_suspend_cb, | |
1052 | .get_sndtimeo = chan_get_sndtimeo_cb, | |
1053 | .alloc_skb = chan_alloc_skb_cb, | |
6b8d4a6a JR |
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 | ||
7b2ed60e | 1090 | err = l2cap_chan_connect(pchan, cpu_to_le16(L2CAP_PSM_IPSP), 0, |
6b8d4a6a JR |
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 | ||
7b2ed60e | 1123 | if (!enable_6lowpan) |
6b8d4a6a JR |
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 | ||
7b2ed60e | 1135 | BT_DBG("chan %p src type %d", pchan, pchan->src_type); |
6b8d4a6a | 1136 | |
7b2ed60e | 1137 | err = l2cap_add_psm(pchan, addr, cpu_to_le16(L2CAP_PSM_IPSP)); |
6b8d4a6a JR |
1138 | if (err) { |
1139 | l2cap_chan_put(pchan); | |
1140 | BT_ERR("psm cannot be added err %d", err); | |
1141 | return NULL; | |
1142 | } | |
1143 | ||
1144 | return pchan; | |
1145 | } | |
1146 | ||
1147 | static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type, | |
1148 | struct l2cap_conn **conn) | |
1149 | { | |
1150 | struct hci_conn *hcon; | |
1151 | struct hci_dev *hdev; | |
1152 | bdaddr_t *src = BDADDR_ANY; | |
1153 | int n; | |
1154 | ||
1155 | n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu", | |
1156 | &addr->b[5], &addr->b[4], &addr->b[3], | |
1157 | &addr->b[2], &addr->b[1], &addr->b[0], | |
1158 | addr_type); | |
1159 | ||
1160 | if (n < 7) | |
1161 | return -EINVAL; | |
1162 | ||
1163 | hdev = hci_get_route(addr, src); | |
1164 | if (!hdev) | |
1165 | return -ENOENT; | |
1166 | ||
1167 | hci_dev_lock(hdev); | |
1168 | hcon = hci_conn_hash_lookup_ba(hdev, LE_LINK, addr); | |
1169 | hci_dev_unlock(hdev); | |
1170 | ||
1171 | if (!hcon) | |
1172 | return -ENOENT; | |
1173 | ||
1174 | *conn = (struct l2cap_conn *)hcon->l2cap_data; | |
1175 | ||
1176 | BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type); | |
1177 | ||
1178 | return 0; | |
1179 | } | |
1180 | ||
1181 | static void disconnect_all_peers(void) | |
1182 | { | |
90305829 | 1183 | struct lowpan_dev *entry; |
6b8d4a6a JR |
1184 | struct lowpan_peer *peer, *tmp_peer, *new_peer; |
1185 | struct list_head peers; | |
6b8d4a6a JR |
1186 | |
1187 | INIT_LIST_HEAD(&peers); | |
1188 | ||
1189 | /* We make a separate list of peers as the close_cb() will | |
1190 | * modify the device peers list so it is better not to mess | |
1191 | * with the same list at the same time. | |
1192 | */ | |
1193 | ||
90305829 | 1194 | rcu_read_lock(); |
6b8d4a6a | 1195 | |
90305829 JR |
1196 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
1197 | list_for_each_entry_rcu(peer, &entry->peers, list) { | |
6b8d4a6a JR |
1198 | new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC); |
1199 | if (!new_peer) | |
1200 | break; | |
1201 | ||
1202 | new_peer->chan = peer->chan; | |
1203 | INIT_LIST_HEAD(&new_peer->list); | |
1204 | ||
1205 | list_add(&new_peer->list, &peers); | |
1206 | } | |
1207 | } | |
1208 | ||
90305829 | 1209 | rcu_read_unlock(); |
6b8d4a6a | 1210 | |
90305829 | 1211 | spin_lock(&devices_lock); |
6b8d4a6a JR |
1212 | list_for_each_entry_safe(peer, tmp_peer, &peers, list) { |
1213 | l2cap_chan_close(peer->chan, ENOENT); | |
90305829 JR |
1214 | |
1215 | list_del_rcu(&peer->list); | |
4e790226 | 1216 | kfree_rcu(peer, rcu); |
6b8d4a6a | 1217 | } |
90305829 | 1218 | spin_unlock(&devices_lock); |
6b8d4a6a JR |
1219 | } |
1220 | ||
7b2ed60e | 1221 | struct set_enable { |
90305829 | 1222 | struct work_struct work; |
7b2ed60e | 1223 | bool flag; |
90305829 | 1224 | }; |
6b8d4a6a | 1225 | |
7b2ed60e | 1226 | static void do_enable_set(struct work_struct *work) |
90305829 | 1227 | { |
7b2ed60e JR |
1228 | struct set_enable *set_enable = container_of(work, |
1229 | struct set_enable, work); | |
90305829 | 1230 | |
7b2ed60e | 1231 | if (!set_enable->flag || enable_6lowpan != set_enable->flag) |
6b8d4a6a | 1232 | /* Disconnect existing connections if 6lowpan is |
7b2ed60e | 1233 | * disabled |
6b8d4a6a JR |
1234 | */ |
1235 | disconnect_all_peers(); | |
1236 | ||
7b2ed60e | 1237 | enable_6lowpan = set_enable->flag; |
6b8d4a6a JR |
1238 | |
1239 | if (listen_chan) { | |
1240 | l2cap_chan_close(listen_chan, 0); | |
1241 | l2cap_chan_put(listen_chan); | |
1242 | } | |
1243 | ||
1244 | listen_chan = bt_6lowpan_listen(); | |
1245 | ||
7b2ed60e | 1246 | kfree(set_enable); |
90305829 JR |
1247 | } |
1248 | ||
7b2ed60e | 1249 | static int lowpan_enable_set(void *data, u64 val) |
90305829 | 1250 | { |
7b2ed60e | 1251 | struct set_enable *set_enable; |
90305829 | 1252 | |
7b2ed60e JR |
1253 | set_enable = kzalloc(sizeof(*set_enable), GFP_KERNEL); |
1254 | if (!set_enable) | |
90305829 JR |
1255 | return -ENOMEM; |
1256 | ||
7b2ed60e JR |
1257 | set_enable->flag = !!val; |
1258 | INIT_WORK(&set_enable->work, do_enable_set); | |
90305829 | 1259 | |
7b2ed60e | 1260 | schedule_work(&set_enable->work); |
90305829 | 1261 | |
6b8d4a6a JR |
1262 | return 0; |
1263 | } | |
1264 | ||
7b2ed60e | 1265 | static int lowpan_enable_get(void *data, u64 *val) |
6b8d4a6a | 1266 | { |
7b2ed60e | 1267 | *val = enable_6lowpan; |
6b8d4a6a JR |
1268 | return 0; |
1269 | } | |
1270 | ||
7b2ed60e JR |
1271 | DEFINE_SIMPLE_ATTRIBUTE(lowpan_enable_fops, lowpan_enable_get, |
1272 | lowpan_enable_set, "%llu\n"); | |
6b8d4a6a JR |
1273 | |
1274 | static ssize_t lowpan_control_write(struct file *fp, | |
1275 | const char __user *user_buffer, | |
1276 | size_t count, | |
1277 | loff_t *position) | |
1278 | { | |
1279 | char buf[32]; | |
1280 | size_t buf_size = min(count, sizeof(buf) - 1); | |
1281 | int ret; | |
1282 | bdaddr_t addr; | |
1283 | u8 addr_type; | |
1284 | struct l2cap_conn *conn = NULL; | |
1285 | ||
1286 | if (copy_from_user(buf, user_buffer, buf_size)) | |
1287 | return -EFAULT; | |
1288 | ||
1289 | buf[buf_size] = '\0'; | |
1290 | ||
1291 | if (memcmp(buf, "connect ", 8) == 0) { | |
1292 | ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn); | |
1293 | if (ret == -EINVAL) | |
1294 | return ret; | |
1295 | ||
1296 | if (listen_chan) { | |
1297 | l2cap_chan_close(listen_chan, 0); | |
1298 | l2cap_chan_put(listen_chan); | |
1299 | listen_chan = NULL; | |
1300 | } | |
1301 | ||
1302 | if (conn) { | |
1303 | struct lowpan_peer *peer; | |
1304 | ||
1305 | if (!is_bt_6lowpan(conn->hcon)) | |
1306 | return -EINVAL; | |
1307 | ||
1308 | peer = lookup_peer(conn); | |
1309 | if (peer) { | |
1310 | BT_DBG("6LoWPAN connection already exists"); | |
1311 | return -EALREADY; | |
1312 | } | |
1313 | ||
1314 | BT_DBG("conn %p dst %pMR type %d user %d", conn, | |
1315 | &conn->hcon->dst, conn->hcon->dst_type, | |
1316 | addr_type); | |
1317 | } | |
1318 | ||
1319 | ret = bt_6lowpan_connect(&addr, addr_type); | |
1320 | if (ret < 0) | |
1321 | return ret; | |
1322 | ||
1323 | return count; | |
1324 | } | |
1325 | ||
1326 | if (memcmp(buf, "disconnect ", 11) == 0) { | |
1327 | ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn); | |
1328 | if (ret < 0) | |
1329 | return ret; | |
1330 | ||
1331 | ret = bt_6lowpan_disconnect(conn, addr_type); | |
1332 | if (ret < 0) | |
1333 | return ret; | |
1334 | ||
1335 | return count; | |
1336 | } | |
1337 | ||
1338 | return count; | |
1339 | } | |
1340 | ||
1341 | static int lowpan_control_show(struct seq_file *f, void *ptr) | |
1342 | { | |
90305829 JR |
1343 | struct lowpan_dev *entry; |
1344 | struct lowpan_peer *peer; | |
6b8d4a6a | 1345 | |
90305829 | 1346 | spin_lock(&devices_lock); |
6b8d4a6a | 1347 | |
90305829 JR |
1348 | list_for_each_entry(entry, &bt_6lowpan_devices, list) { |
1349 | list_for_each_entry(peer, &entry->peers, list) | |
6b8d4a6a JR |
1350 | seq_printf(f, "%pMR (type %u)\n", |
1351 | &peer->chan->dst, peer->chan->dst_type); | |
1352 | } | |
1353 | ||
90305829 | 1354 | spin_unlock(&devices_lock); |
6b8d4a6a JR |
1355 | |
1356 | return 0; | |
1357 | } | |
1358 | ||
1359 | static int lowpan_control_open(struct inode *inode, struct file *file) | |
1360 | { | |
1361 | return single_open(file, lowpan_control_show, inode->i_private); | |
1362 | } | |
1363 | ||
1364 | static const struct file_operations lowpan_control_fops = { | |
1365 | .open = lowpan_control_open, | |
1366 | .read = seq_read, | |
1367 | .write = lowpan_control_write, | |
1368 | .llseek = seq_lseek, | |
1369 | .release = single_release, | |
1370 | }; | |
1371 | ||
7f118253 JR |
1372 | static void disconnect_devices(void) |
1373 | { | |
daac197c | 1374 | struct lowpan_dev *entry, *tmp, *new_dev; |
7f118253 | 1375 | struct list_head devices; |
7f118253 JR |
1376 | |
1377 | INIT_LIST_HEAD(&devices); | |
1378 | ||
1379 | /* We make a separate list of devices because the unregister_netdev() | |
1380 | * will call device_event() which will also want to modify the same | |
1381 | * devices list. | |
1382 | */ | |
1383 | ||
90305829 | 1384 | rcu_read_lock(); |
7f118253 | 1385 | |
90305829 | 1386 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
7f118253 JR |
1387 | new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC); |
1388 | if (!new_dev) | |
1389 | break; | |
1390 | ||
1391 | new_dev->netdev = entry->netdev; | |
1392 | INIT_LIST_HEAD(&new_dev->list); | |
1393 | ||
90305829 | 1394 | list_add_rcu(&new_dev->list, &devices); |
7f118253 JR |
1395 | } |
1396 | ||
90305829 | 1397 | rcu_read_unlock(); |
7f118253 | 1398 | |
daac197c | 1399 | list_for_each_entry_safe(entry, tmp, &devices, list) { |
7f118253 JR |
1400 | ifdown(entry->netdev); |
1401 | BT_DBG("Unregistering netdev %s %p", | |
1402 | entry->netdev->name, entry->netdev); | |
1403 | unregister_netdev(entry->netdev); | |
1404 | kfree(entry); | |
1405 | } | |
1406 | } | |
1407 | ||
18722c24 JR |
1408 | static int device_event(struct notifier_block *unused, |
1409 | unsigned long event, void *ptr) | |
1410 | { | |
1411 | struct net_device *netdev = netdev_notifier_info_to_dev(ptr); | |
90305829 | 1412 | struct lowpan_dev *entry; |
18722c24 JR |
1413 | |
1414 | if (netdev->type != ARPHRD_6LOWPAN) | |
1415 | return NOTIFY_DONE; | |
1416 | ||
1417 | switch (event) { | |
1418 | case NETDEV_UNREGISTER: | |
90305829 JR |
1419 | spin_lock(&devices_lock); |
1420 | list_for_each_entry(entry, &bt_6lowpan_devices, list) { | |
18722c24 | 1421 | if (entry->netdev == netdev) { |
7f118253 JR |
1422 | BT_DBG("Unregistered netdev %s %p", |
1423 | netdev->name, netdev); | |
18722c24 | 1424 | list_del(&entry->list); |
18722c24 JR |
1425 | break; |
1426 | } | |
1427 | } | |
90305829 | 1428 | spin_unlock(&devices_lock); |
18722c24 JR |
1429 | break; |
1430 | } | |
1431 | ||
1432 | return NOTIFY_DONE; | |
1433 | } | |
1434 | ||
1435 | static struct notifier_block bt_6lowpan_dev_notifier = { | |
1436 | .notifier_call = device_event, | |
1437 | }; | |
1438 | ||
5547e48c | 1439 | static int __init bt_6lowpan_init(void) |
18722c24 | 1440 | { |
7b2ed60e JR |
1441 | lowpan_enable_debugfs = debugfs_create_file("6lowpan_enable", 0644, |
1442 | bt_debugfs, NULL, | |
1443 | &lowpan_enable_fops); | |
6b8d4a6a JR |
1444 | lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644, |
1445 | bt_debugfs, NULL, | |
1446 | &lowpan_control_fops); | |
1447 | ||
18722c24 JR |
1448 | return register_netdevice_notifier(&bt_6lowpan_dev_notifier); |
1449 | } | |
1450 | ||
5547e48c | 1451 | static void __exit bt_6lowpan_exit(void) |
18722c24 | 1452 | { |
7b2ed60e | 1453 | debugfs_remove(lowpan_enable_debugfs); |
6b8d4a6a JR |
1454 | debugfs_remove(lowpan_control_debugfs); |
1455 | ||
1456 | if (listen_chan) { | |
1457 | l2cap_chan_close(listen_chan, 0); | |
1458 | l2cap_chan_put(listen_chan); | |
1459 | } | |
1460 | ||
7f118253 JR |
1461 | disconnect_devices(); |
1462 | ||
18722c24 JR |
1463 | unregister_netdevice_notifier(&bt_6lowpan_dev_notifier); |
1464 | } | |
5547e48c JR |
1465 | |
1466 | module_init(bt_6lowpan_init); | |
1467 | module_exit(bt_6lowpan_exit); | |
1468 | ||
1469 | MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>"); | |
1470 | MODULE_DESCRIPTION("Bluetooth 6LoWPAN"); | |
1471 | MODULE_VERSION(VERSION); | |
1472 | MODULE_LICENSE("GPL"); |