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Commit | Line | Data |
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18722c24 | 1 | /* |
6b8d4a6a | 2 | Copyright (c) 2013-2014 Intel Corp. |
18722c24 JR |
3 | |
4 | This program is free software; you can redistribute it and/or modify | |
5 | it under the terms of the GNU General Public License version 2 and | |
6 | only version 2 as published by the Free Software Foundation. | |
7 | ||
8 | This program is distributed in the hope that it will be useful, | |
9 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | GNU General Public License for more details. | |
12 | */ | |
13 | ||
18722c24 JR |
14 | #include <linux/if_arp.h> |
15 | #include <linux/netdevice.h> | |
16 | #include <linux/etherdevice.h> | |
5547e48c | 17 | #include <linux/module.h> |
6b8d4a6a | 18 | #include <linux/debugfs.h> |
18722c24 JR |
19 | |
20 | #include <net/ipv6.h> | |
21 | #include <net/ip6_route.h> | |
22 | #include <net/addrconf.h> | |
23 | ||
18722c24 JR |
24 | #include <net/bluetooth/bluetooth.h> |
25 | #include <net/bluetooth/hci_core.h> | |
26 | #include <net/bluetooth/l2cap.h> | |
27 | ||
cefc8c8a | 28 | #include <net/6lowpan.h> /* for the compression support */ |
18722c24 | 29 | |
6b8d4a6a JR |
30 | #define VERSION "0.1" |
31 | ||
7b2ed60e | 32 | static struct dentry *lowpan_enable_debugfs; |
6b8d4a6a JR |
33 | static struct dentry *lowpan_control_debugfs; |
34 | ||
18722c24 | 35 | #define IFACE_NAME_TEMPLATE "bt%d" |
18722c24 JR |
36 | |
37 | struct skb_cb { | |
38 | struct in6_addr addr; | |
39e90c77 | 39 | struct in6_addr gw; |
6b8d4a6a JR |
40 | struct l2cap_chan *chan; |
41 | int status; | |
18722c24 JR |
42 | }; |
43 | #define lowpan_cb(skb) ((struct skb_cb *)((skb)->cb)) | |
44 | ||
45 | /* The devices list contains those devices that we are acting | |
46 | * as a proxy. The BT 6LoWPAN device is a virtual device that | |
47 | * connects to the Bluetooth LE device. The real connection to | |
48 | * BT device is done via l2cap layer. There exists one | |
49 | * virtual device / one BT 6LoWPAN network (=hciX device). | |
50 | * The list contains struct lowpan_dev elements. | |
51 | */ | |
52 | static LIST_HEAD(bt_6lowpan_devices); | |
90305829 | 53 | static DEFINE_SPINLOCK(devices_lock); |
18722c24 | 54 | |
7b2ed60e | 55 | static bool enable_6lowpan; |
6b8d4a6a JR |
56 | |
57 | /* We are listening incoming connections via this channel | |
58 | */ | |
59 | static struct l2cap_chan *listen_chan; | |
60 | ||
18722c24 JR |
61 | struct lowpan_peer { |
62 | struct list_head list; | |
90305829 | 63 | struct rcu_head rcu; |
6b8d4a6a | 64 | struct l2cap_chan *chan; |
18722c24 JR |
65 | |
66 | /* peer addresses in various formats */ | |
67 | unsigned char eui64_addr[EUI64_ADDR_LEN]; | |
68 | struct in6_addr peer_addr; | |
69 | }; | |
70 | ||
2e4d60cb | 71 | struct lowpan_btle_dev { |
18722c24 JR |
72 | struct list_head list; |
73 | ||
74 | struct hci_dev *hdev; | |
75 | struct net_device *netdev; | |
76 | struct list_head peers; | |
77 | atomic_t peer_count; /* number of items in peers list */ | |
78 | ||
79 | struct work_struct delete_netdev; | |
80 | struct delayed_work notify_peers; | |
81 | }; | |
82 | ||
2e4d60cb AA |
83 | static inline struct lowpan_btle_dev * |
84 | lowpan_btle_dev(const struct net_device *netdev) | |
18722c24 | 85 | { |
2e4d60cb | 86 | return (struct lowpan_btle_dev *)lowpan_dev(netdev)->priv; |
18722c24 JR |
87 | } |
88 | ||
2e4d60cb AA |
89 | static inline void peer_add(struct lowpan_btle_dev *dev, |
90 | struct lowpan_peer *peer) | |
18722c24 | 91 | { |
90305829 | 92 | list_add_rcu(&peer->list, &dev->peers); |
18722c24 JR |
93 | atomic_inc(&dev->peer_count); |
94 | } | |
95 | ||
2e4d60cb AA |
96 | static inline bool peer_del(struct lowpan_btle_dev *dev, |
97 | struct lowpan_peer *peer) | |
18722c24 | 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 | ||
2e4d60cb | 112 | static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_btle_dev *dev, |
18722c24 JR |
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 | ||
2e4d60cb AA |
140 | static inline struct lowpan_peer * |
141 | __peer_lookup_chan(struct lowpan_btle_dev *dev, 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 | ||
2e4d60cb AA |
153 | static inline struct lowpan_peer * |
154 | __peer_lookup_conn(struct lowpan_btle_dev *dev, 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 | ||
2e4d60cb | 166 | static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_btle_dev *dev, |
39e90c77 JR |
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 | { | |
2e4d60cb | 226 | struct lowpan_btle_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 | ||
2e4d60cb | 242 | static struct lowpan_btle_dev *lookup_dev(struct l2cap_conn *conn) |
18722c24 | 243 | { |
2e4d60cb AA |
244 | struct lowpan_btle_dev *entry; |
245 | struct lowpan_btle_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 | |
324e786e | 269 | return netif_rx_ni(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; | |
2e4d60cb | 276 | struct lowpan_btle_dev *dev; |
18722c24 | 277 | struct lowpan_peer *peer; |
18722c24 | 278 | |
2e4d60cb | 279 | dev = lowpan_btle_dev(netdev); |
18722c24 | 280 | |
90305829 JR |
281 | rcu_read_lock(); |
282 | peer = __peer_lookup_chan(dev, chan); | |
283 | rcu_read_unlock(); | |
18722c24 | 284 | if (!peer) |
56b2c3ee | 285 | return -EINVAL; |
18722c24 JR |
286 | |
287 | saddr = peer->eui64_addr; | |
288 | daddr = dev->netdev->dev_addr; | |
289 | ||
8911d774 | 290 | return lowpan_header_decompress(skb, netdev, daddr, saddr); |
18722c24 JR |
291 | } |
292 | ||
293 | static int recv_pkt(struct sk_buff *skb, struct net_device *dev, | |
6b8d4a6a | 294 | struct l2cap_chan *chan) |
18722c24 JR |
295 | { |
296 | struct sk_buff *local_skb; | |
297 | int ret; | |
298 | ||
299 | if (!netif_running(dev)) | |
300 | goto drop; | |
301 | ||
cefdb801 | 302 | if (dev->type != ARPHRD_6LOWPAN || !skb->len) |
18722c24 JR |
303 | goto drop; |
304 | ||
cefdb801 AA |
305 | skb_reset_network_header(skb); |
306 | ||
11e3ff70 MT |
307 | skb = skb_share_check(skb, GFP_ATOMIC); |
308 | if (!skb) | |
309 | goto drop; | |
310 | ||
18722c24 | 311 | /* check that it's our buffer */ |
cefdb801 | 312 | if (lowpan_is_ipv6(*skb_network_header(skb))) { |
87f5fedb LD |
313 | /* Pull off the 1-byte of 6lowpan header. */ |
314 | skb_pull(skb, 1); | |
315 | ||
18722c24 JR |
316 | /* Copy the packet so that the IPv6 header is |
317 | * properly aligned. | |
318 | */ | |
319 | local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1, | |
320 | skb_tailroom(skb), GFP_ATOMIC); | |
321 | if (!local_skb) | |
322 | goto drop; | |
323 | ||
324 | local_skb->protocol = htons(ETH_P_IPV6); | |
325 | local_skb->pkt_type = PACKET_HOST; | |
4c58f328 | 326 | local_skb->dev = dev; |
18722c24 | 327 | |
18722c24 JR |
328 | skb_set_transport_header(local_skb, sizeof(struct ipv6hdr)); |
329 | ||
330 | if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) { | |
331 | kfree_skb(local_skb); | |
332 | goto drop; | |
333 | } | |
334 | ||
335 | dev->stats.rx_bytes += skb->len; | |
336 | dev->stats.rx_packets++; | |
337 | ||
3c400b84 MT |
338 | consume_skb(local_skb); |
339 | consume_skb(skb); | |
cefdb801 AA |
340 | } else if (lowpan_is_iphc(*skb_network_header(skb))) { |
341 | local_skb = skb_clone(skb, GFP_ATOMIC); | |
342 | if (!local_skb) | |
343 | goto drop; | |
344 | ||
4c58f328 GRB |
345 | local_skb->dev = dev; |
346 | ||
cefdb801 AA |
347 | ret = iphc_decompress(local_skb, dev, chan); |
348 | if (ret < 0) { | |
349 | kfree_skb(local_skb); | |
350 | goto drop; | |
351 | } | |
352 | ||
353 | local_skb->protocol = htons(ETH_P_IPV6); | |
354 | local_skb->pkt_type = PACKET_HOST; | |
cefdb801 AA |
355 | |
356 | if (give_skb_to_upper(local_skb, dev) | |
357 | != NET_RX_SUCCESS) { | |
358 | kfree_skb(local_skb); | |
359 | goto drop; | |
18722c24 | 360 | } |
cefdb801 AA |
361 | |
362 | dev->stats.rx_bytes += skb->len; | |
363 | dev->stats.rx_packets++; | |
364 | ||
365 | consume_skb(local_skb); | |
366 | consume_skb(skb); | |
367 | } else { | |
368 | goto drop; | |
18722c24 JR |
369 | } |
370 | ||
371 | return NET_RX_SUCCESS; | |
372 | ||
373 | drop: | |
6b8d4a6a | 374 | dev->stats.rx_dropped++; |
18722c24 JR |
375 | return NET_RX_DROP; |
376 | } | |
377 | ||
378 | /* Packet from BT LE device */ | |
6b8d4a6a | 379 | static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
18722c24 | 380 | { |
2e4d60cb | 381 | struct lowpan_btle_dev *dev; |
18722c24 JR |
382 | struct lowpan_peer *peer; |
383 | int err; | |
384 | ||
6b8d4a6a | 385 | peer = lookup_peer(chan->conn); |
18722c24 JR |
386 | if (!peer) |
387 | return -ENOENT; | |
388 | ||
6b8d4a6a | 389 | dev = lookup_dev(chan->conn); |
30d3db44 | 390 | if (!dev || !dev->netdev) |
18722c24 JR |
391 | return -ENOENT; |
392 | ||
6b8d4a6a JR |
393 | err = recv_pkt(skb, dev->netdev, chan); |
394 | if (err) { | |
395 | BT_DBG("recv pkt %d", err); | |
396 | err = -EAGAIN; | |
18722c24 JR |
397 | } |
398 | ||
6b8d4a6a | 399 | return err; |
18722c24 JR |
400 | } |
401 | ||
62bbd5b3 | 402 | static u8 get_addr_type_from_eui64(u8 byte) |
18722c24 | 403 | { |
6b8d4a6a JR |
404 | /* Is universal(0) or local(1) bit */ |
405 | return ((byte & 0x02) ? BDADDR_LE_RANDOM : BDADDR_LE_PUBLIC); | |
62bbd5b3 JR |
406 | } |
407 | ||
408 | static void copy_to_bdaddr(struct in6_addr *ip6_daddr, bdaddr_t *addr) | |
409 | { | |
410 | u8 *eui64 = ip6_daddr->s6_addr + 8; | |
18722c24 JR |
411 | |
412 | addr->b[0] = eui64[7]; | |
413 | addr->b[1] = eui64[6]; | |
414 | addr->b[2] = eui64[5]; | |
415 | addr->b[3] = eui64[2]; | |
416 | addr->b[4] = eui64[1]; | |
417 | addr->b[5] = eui64[0]; | |
62bbd5b3 | 418 | } |
18722c24 | 419 | |
62bbd5b3 JR |
420 | static void convert_dest_bdaddr(struct in6_addr *ip6_daddr, |
421 | bdaddr_t *addr, u8 *addr_type) | |
422 | { | |
423 | copy_to_bdaddr(ip6_daddr, addr); | |
18722c24 | 424 | |
62bbd5b3 JR |
425 | /* We need to toggle the U/L bit that we got from IPv6 address |
426 | * so that we get the proper address and type of the BD address. | |
427 | */ | |
428 | addr->b[5] ^= 0x02; | |
429 | ||
430 | *addr_type = get_addr_type_from_eui64(addr->b[5]); | |
18722c24 JR |
431 | } |
432 | ||
36b3dd25 JR |
433 | static int setup_header(struct sk_buff *skb, struct net_device *netdev, |
434 | bdaddr_t *peer_addr, u8 *peer_addr_type) | |
18722c24 | 435 | { |
36b3dd25 | 436 | struct in6_addr ipv6_daddr; |
55441070 | 437 | struct ipv6hdr *hdr; |
2e4d60cb | 438 | struct lowpan_btle_dev *dev; |
18722c24 JR |
439 | struct lowpan_peer *peer; |
440 | bdaddr_t addr, *any = BDADDR_ANY; | |
36b3dd25 JR |
441 | u8 *daddr = any->b; |
442 | int err, status = 0; | |
18722c24 | 443 | |
55441070 GRB |
444 | hdr = ipv6_hdr(skb); |
445 | ||
2e4d60cb | 446 | dev = lowpan_btle_dev(netdev); |
18722c24 | 447 | |
55441070 | 448 | memcpy(&ipv6_daddr, &hdr->daddr, sizeof(ipv6_daddr)); |
36b3dd25 JR |
449 | |
450 | if (ipv6_addr_is_multicast(&ipv6_daddr)) { | |
6b8d4a6a | 451 | lowpan_cb(skb)->chan = NULL; |
18722c24 | 452 | } else { |
36b3dd25 | 453 | u8 addr_type; |
18722c24 JR |
454 | |
455 | /* Get destination BT device from skb. | |
456 | * If there is no such peer then discard the packet. | |
457 | */ | |
36b3dd25 | 458 | convert_dest_bdaddr(&ipv6_daddr, &addr, &addr_type); |
18722c24 | 459 | |
6b8d4a6a | 460 | BT_DBG("dest addr %pMR type %d IP %pI6c", &addr, |
36b3dd25 | 461 | addr_type, &ipv6_daddr); |
18722c24 | 462 | |
18722c24 | 463 | peer = peer_lookup_ba(dev, &addr, addr_type); |
18722c24 | 464 | if (!peer) { |
39e90c77 JR |
465 | /* The packet might be sent to 6lowpan interface |
466 | * because of routing (either via default route | |
467 | * or user set route) so get peer according to | |
468 | * the destination address. | |
469 | */ | |
36b3dd25 | 470 | peer = peer_lookup_dst(dev, &ipv6_daddr, skb); |
39e90c77 JR |
471 | if (!peer) { |
472 | BT_DBG("no such peer %pMR found", &addr); | |
473 | return -ENOENT; | |
474 | } | |
18722c24 JR |
475 | } |
476 | ||
477 | daddr = peer->eui64_addr; | |
36b3dd25 JR |
478 | *peer_addr = addr; |
479 | *peer_addr_type = addr_type; | |
6b8d4a6a | 480 | lowpan_cb(skb)->chan = peer->chan; |
36b3dd25 JR |
481 | |
482 | status = 1; | |
18722c24 JR |
483 | } |
484 | ||
a6f77389 | 485 | lowpan_header_compress(skb, netdev, daddr, dev->netdev->dev_addr); |
36b3dd25 JR |
486 | |
487 | err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0); | |
488 | if (err < 0) | |
489 | return err; | |
490 | ||
491 | return status; | |
492 | } | |
493 | ||
494 | static int header_create(struct sk_buff *skb, struct net_device *netdev, | |
495 | unsigned short type, const void *_daddr, | |
496 | const void *_saddr, unsigned int len) | |
497 | { | |
36b3dd25 JR |
498 | if (type != ETH_P_IPV6) |
499 | return -EINVAL; | |
500 | ||
36b3dd25 | 501 | return 0; |
18722c24 JR |
502 | } |
503 | ||
504 | /* Packet to BT LE device */ | |
6b8d4a6a | 505 | static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb, |
d7b6b0a5 | 506 | struct net_device *netdev) |
18722c24 | 507 | { |
6b8d4a6a JR |
508 | struct msghdr msg; |
509 | struct kvec iv; | |
510 | int err; | |
511 | ||
512 | /* Remember the skb so that we can send EAGAIN to the caller if | |
d7b6b0a5 | 513 | * we run out of credits. |
6b8d4a6a | 514 | */ |
d7b6b0a5 | 515 | chan->data = skb; |
6b8d4a6a | 516 | |
6b8d4a6a JR |
517 | iv.iov_base = skb->data; |
518 | iv.iov_len = skb->len; | |
519 | ||
c0371da6 | 520 | memset(&msg, 0, sizeof(msg)); |
17836394 | 521 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, &iv, 1, skb->len); |
c0371da6 | 522 | |
6b8d4a6a JR |
523 | err = l2cap_chan_send(chan, &msg, skb->len); |
524 | if (err > 0) { | |
525 | netdev->stats.tx_bytes += err; | |
526 | netdev->stats.tx_packets++; | |
527 | return 0; | |
528 | } | |
529 | ||
530 | if (!err) | |
531 | err = lowpan_cb(skb)->status; | |
532 | ||
533 | if (err < 0) { | |
534 | if (err == -EAGAIN) | |
535 | netdev->stats.tx_dropped++; | |
536 | else | |
537 | netdev->stats.tx_errors++; | |
538 | } | |
18722c24 | 539 | |
6b8d4a6a | 540 | return err; |
18722c24 JR |
541 | } |
542 | ||
9c238ca8 | 543 | static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev) |
18722c24 JR |
544 | { |
545 | struct sk_buff *local_skb; | |
2e4d60cb | 546 | struct lowpan_btle_dev *entry; |
9c238ca8 | 547 | int err = 0; |
18722c24 | 548 | |
90305829 | 549 | rcu_read_lock(); |
18722c24 | 550 | |
90305829 JR |
551 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
552 | struct lowpan_peer *pentry; | |
2e4d60cb | 553 | struct lowpan_btle_dev *dev; |
18722c24 JR |
554 | |
555 | if (entry->netdev != netdev) | |
556 | continue; | |
557 | ||
2e4d60cb | 558 | dev = lowpan_btle_dev(entry->netdev); |
18722c24 | 559 | |
90305829 | 560 | list_for_each_entry_rcu(pentry, &dev->peers, list) { |
9c238ca8 JR |
561 | int ret; |
562 | ||
18722c24 JR |
563 | local_skb = skb_clone(skb, GFP_ATOMIC); |
564 | ||
36b3dd25 JR |
565 | BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p", |
566 | netdev->name, | |
567 | &pentry->chan->dst, pentry->chan->dst_type, | |
568 | &pentry->peer_addr, pentry->chan); | |
9c238ca8 JR |
569 | ret = send_pkt(pentry->chan, local_skb, netdev); |
570 | if (ret < 0) | |
571 | err = ret; | |
18722c24 JR |
572 | |
573 | kfree_skb(local_skb); | |
574 | } | |
575 | } | |
576 | ||
90305829 | 577 | rcu_read_unlock(); |
9c238ca8 JR |
578 | |
579 | return err; | |
18722c24 JR |
580 | } |
581 | ||
582 | static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev) | |
583 | { | |
584 | int err = 0; | |
18722c24 JR |
585 | bdaddr_t addr; |
586 | u8 addr_type; | |
587 | ||
36b3dd25 JR |
588 | /* We must take a copy of the skb before we modify/replace the ipv6 |
589 | * header as the header could be used elsewhere | |
590 | */ | |
b0c42cd7 AA |
591 | skb = skb_unshare(skb, GFP_ATOMIC); |
592 | if (!skb) | |
36b3dd25 JR |
593 | return NET_XMIT_DROP; |
594 | ||
595 | /* Return values from setup_header() | |
596 | * <0 - error, packet is dropped | |
597 | * 0 - this is a multicast packet | |
598 | * 1 - this is unicast packet | |
599 | */ | |
600 | err = setup_header(skb, netdev, &addr, &addr_type); | |
601 | if (err < 0) { | |
602 | kfree_skb(skb); | |
603 | return NET_XMIT_DROP; | |
604 | } | |
18722c24 | 605 | |
36b3dd25 JR |
606 | if (err) { |
607 | if (lowpan_cb(skb)->chan) { | |
608 | BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p", | |
609 | netdev->name, &addr, addr_type, | |
610 | &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan); | |
d7b6b0a5 | 611 | err = send_pkt(lowpan_cb(skb)->chan, skb, netdev); |
36b3dd25 | 612 | } else { |
6b8d4a6a | 613 | err = -ENOENT; |
36b3dd25 JR |
614 | } |
615 | } else { | |
616 | /* We need to send the packet to every device behind this | |
617 | * interface. | |
618 | */ | |
9c238ca8 | 619 | err = send_mcast_pkt(skb, netdev); |
18722c24 | 620 | } |
18722c24 | 621 | |
fc12518a JR |
622 | dev_kfree_skb(skb); |
623 | ||
18722c24 JR |
624 | if (err) |
625 | BT_DBG("ERROR: xmit failed (%d)", err); | |
626 | ||
36b3dd25 | 627 | return err < 0 ? NET_XMIT_DROP : err; |
18722c24 JR |
628 | } |
629 | ||
df092306 JR |
630 | static int bt_dev_init(struct net_device *dev) |
631 | { | |
d3fff6c4 | 632 | netdev_lockdep_set_classes(dev); |
df092306 JR |
633 | |
634 | return 0; | |
635 | } | |
636 | ||
18722c24 | 637 | static const struct net_device_ops netdev_ops = { |
df092306 | 638 | .ndo_init = bt_dev_init, |
18722c24 JR |
639 | .ndo_start_xmit = bt_xmit, |
640 | }; | |
641 | ||
642 | static struct header_ops header_ops = { | |
643 | .create = header_create, | |
644 | }; | |
645 | ||
646 | static void netdev_setup(struct net_device *dev) | |
647 | { | |
18722c24 JR |
648 | dev->hard_header_len = 0; |
649 | dev->needed_tailroom = 0; | |
156395c9 JR |
650 | dev->flags = IFF_RUNNING | IFF_POINTOPOINT | |
651 | IFF_MULTICAST; | |
18722c24 JR |
652 | dev->watchdog_timeo = 0; |
653 | ||
654 | dev->netdev_ops = &netdev_ops; | |
655 | dev->header_ops = &header_ops; | |
656 | dev->destructor = free_netdev; | |
657 | } | |
658 | ||
659 | static struct device_type bt_type = { | |
660 | .name = "bluetooth", | |
661 | }; | |
662 | ||
663 | static void set_addr(u8 *eui, u8 *addr, u8 addr_type) | |
664 | { | |
665 | /* addr is the BT address in little-endian format */ | |
666 | eui[0] = addr[5]; | |
667 | eui[1] = addr[4]; | |
668 | eui[2] = addr[3]; | |
669 | eui[3] = 0xFF; | |
670 | eui[4] = 0xFE; | |
671 | eui[5] = addr[2]; | |
672 | eui[6] = addr[1]; | |
673 | eui[7] = addr[0]; | |
674 | ||
62bbd5b3 | 675 | /* Universal/local bit set, BT 6lowpan draft ch. 3.2.1 */ |
6b8d4a6a | 676 | if (addr_type == BDADDR_LE_PUBLIC) |
62bbd5b3 | 677 | eui[0] &= ~0x02; |
18722c24 | 678 | else |
62bbd5b3 JR |
679 | eui[0] |= 0x02; |
680 | ||
681 | BT_DBG("type %d addr %*phC", addr_type, 8, eui); | |
18722c24 JR |
682 | } |
683 | ||
684 | static void set_dev_addr(struct net_device *netdev, bdaddr_t *addr, | |
685 | u8 addr_type) | |
686 | { | |
687 | netdev->addr_assign_type = NET_ADDR_PERM; | |
688 | set_addr(netdev->dev_addr, addr->b, addr_type); | |
18722c24 JR |
689 | } |
690 | ||
691 | static void ifup(struct net_device *netdev) | |
692 | { | |
693 | int err; | |
694 | ||
695 | rtnl_lock(); | |
696 | err = dev_open(netdev); | |
697 | if (err < 0) | |
698 | BT_INFO("iface %s cannot be opened (%d)", netdev->name, err); | |
699 | rtnl_unlock(); | |
700 | } | |
701 | ||
7f118253 JR |
702 | static void ifdown(struct net_device *netdev) |
703 | { | |
704 | int err; | |
705 | ||
706 | rtnl_lock(); | |
707 | err = dev_close(netdev); | |
708 | if (err < 0) | |
709 | BT_INFO("iface %s cannot be closed (%d)", netdev->name, err); | |
710 | rtnl_unlock(); | |
711 | } | |
712 | ||
18722c24 JR |
713 | static void do_notify_peers(struct work_struct *work) |
714 | { | |
2e4d60cb AA |
715 | struct lowpan_btle_dev *dev = container_of(work, struct lowpan_btle_dev, |
716 | notify_peers.work); | |
18722c24 JR |
717 | |
718 | netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */ | |
719 | } | |
720 | ||
721 | static bool is_bt_6lowpan(struct hci_conn *hcon) | |
722 | { | |
723 | if (hcon->type != LE_LINK) | |
724 | return false; | |
725 | ||
7b2ed60e | 726 | if (!enable_6lowpan) |
6b8d4a6a JR |
727 | return false; |
728 | ||
729 | return true; | |
18722c24 JR |
730 | } |
731 | ||
6b8d4a6a JR |
732 | static struct l2cap_chan *chan_create(void) |
733 | { | |
734 | struct l2cap_chan *chan; | |
735 | ||
736 | chan = l2cap_chan_create(); | |
737 | if (!chan) | |
738 | return NULL; | |
739 | ||
740 | l2cap_chan_set_defaults(chan); | |
741 | ||
742 | chan->chan_type = L2CAP_CHAN_CONN_ORIENTED; | |
743 | chan->mode = L2CAP_MODE_LE_FLOWCTL; | |
301de2cb | 744 | chan->imtu = 1280; |
6b8d4a6a JR |
745 | |
746 | return chan; | |
747 | } | |
748 | ||
b2799cec JR |
749 | static void set_ip_addr_bits(u8 addr_type, u8 *addr) |
750 | { | |
751 | if (addr_type == BDADDR_LE_PUBLIC) | |
752 | *addr |= 0x02; | |
753 | else | |
754 | *addr &= ~0x02; | |
755 | } | |
756 | ||
6b8d4a6a | 757 | static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan, |
2e4d60cb | 758 | struct lowpan_btle_dev *dev) |
18722c24 JR |
759 | { |
760 | struct lowpan_peer *peer; | |
18722c24 JR |
761 | |
762 | peer = kzalloc(sizeof(*peer), GFP_ATOMIC); | |
763 | if (!peer) | |
6b8d4a6a | 764 | return NULL; |
18722c24 | 765 | |
6b8d4a6a | 766 | peer->chan = chan; |
18722c24 JR |
767 | memset(&peer->peer_addr, 0, sizeof(struct in6_addr)); |
768 | ||
769 | /* RFC 2464 ch. 5 */ | |
770 | peer->peer_addr.s6_addr[0] = 0xFE; | |
771 | peer->peer_addr.s6_addr[1] = 0x80; | |
6b8d4a6a JR |
772 | set_addr((u8 *)&peer->peer_addr.s6_addr + 8, chan->dst.b, |
773 | chan->dst_type); | |
18722c24 JR |
774 | |
775 | memcpy(&peer->eui64_addr, (u8 *)&peer->peer_addr.s6_addr + 8, | |
776 | EUI64_ADDR_LEN); | |
18722c24 | 777 | |
b2799cec JR |
778 | /* IPv6 address needs to have the U/L bit set properly so toggle |
779 | * it back here. | |
780 | */ | |
781 | set_ip_addr_bits(chan->dst_type, (u8 *)&peer->peer_addr.s6_addr + 8); | |
782 | ||
90305829 | 783 | spin_lock(&devices_lock); |
18722c24 JR |
784 | INIT_LIST_HEAD(&peer->list); |
785 | peer_add(dev, peer); | |
90305829 | 786 | spin_unlock(&devices_lock); |
18722c24 JR |
787 | |
788 | /* Notifying peers about us needs to be done without locks held */ | |
789 | INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers); | |
790 | schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100)); | |
791 | ||
6b8d4a6a | 792 | return peer->chan; |
18722c24 JR |
793 | } |
794 | ||
2e4d60cb | 795 | static int setup_netdev(struct l2cap_chan *chan, struct lowpan_btle_dev **dev) |
18722c24 | 796 | { |
18722c24 JR |
797 | struct net_device *netdev; |
798 | int err = 0; | |
18722c24 | 799 | |
2e4d60cb | 800 | netdev = alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_btle_dev)), |
b72f6f51 AA |
801 | IFACE_NAME_TEMPLATE, NET_NAME_UNKNOWN, |
802 | netdev_setup); | |
18722c24 JR |
803 | if (!netdev) |
804 | return -ENOMEM; | |
805 | ||
6b8d4a6a | 806 | set_dev_addr(netdev, &chan->src, chan->src_type); |
18722c24 JR |
807 | |
808 | netdev->netdev_ops = &netdev_ops; | |
fc84242f | 809 | SET_NETDEV_DEV(netdev, &chan->conn->hcon->hdev->dev); |
18722c24 JR |
810 | SET_NETDEV_DEVTYPE(netdev, &bt_type); |
811 | ||
2e4d60cb | 812 | *dev = lowpan_btle_dev(netdev); |
5857d1db AA |
813 | (*dev)->netdev = netdev; |
814 | (*dev)->hdev = chan->conn->hcon->hdev; | |
815 | INIT_LIST_HEAD(&(*dev)->peers); | |
816 | ||
817 | spin_lock(&devices_lock); | |
818 | INIT_LIST_HEAD(&(*dev)->list); | |
819 | list_add_rcu(&(*dev)->list, &bt_6lowpan_devices); | |
820 | spin_unlock(&devices_lock); | |
821 | ||
00f59314 | 822 | err = lowpan_register_netdev(netdev, LOWPAN_LLTYPE_BTLE); |
18722c24 JR |
823 | if (err < 0) { |
824 | BT_INFO("register_netdev failed %d", err); | |
5857d1db AA |
825 | spin_lock(&devices_lock); |
826 | list_del_rcu(&(*dev)->list); | |
827 | spin_unlock(&devices_lock); | |
18722c24 JR |
828 | free_netdev(netdev); |
829 | goto out; | |
830 | } | |
831 | ||
6b8d4a6a JR |
832 | BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d", |
833 | netdev->ifindex, &chan->dst, chan->dst_type, | |
834 | &chan->src, chan->src_type); | |
18722c24 JR |
835 | set_bit(__LINK_STATE_PRESENT, &netdev->state); |
836 | ||
6b8d4a6a | 837 | return 0; |
18722c24 JR |
838 | |
839 | out: | |
840 | return err; | |
841 | } | |
842 | ||
6b8d4a6a JR |
843 | static inline void chan_ready_cb(struct l2cap_chan *chan) |
844 | { | |
2e4d60cb | 845 | struct lowpan_btle_dev *dev; |
6b8d4a6a JR |
846 | |
847 | dev = lookup_dev(chan->conn); | |
848 | ||
849 | BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev); | |
850 | ||
851 | if (!dev) { | |
852 | if (setup_netdev(chan, &dev) < 0) { | |
853 | l2cap_chan_del(chan, -ENOENT); | |
854 | return; | |
855 | } | |
856 | } | |
857 | ||
18d93c17 JR |
858 | if (!try_module_get(THIS_MODULE)) |
859 | return; | |
860 | ||
6b8d4a6a JR |
861 | add_peer_chan(chan, dev); |
862 | ifup(dev->netdev); | |
863 | } | |
864 | ||
2b293490 | 865 | static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan) |
6b8d4a6a | 866 | { |
2b293490 | 867 | struct l2cap_chan *chan; |
6b8d4a6a | 868 | |
630ef791 JH |
869 | chan = chan_create(); |
870 | if (!chan) | |
871 | return NULL; | |
872 | ||
2b293490 | 873 | chan->ops = pchan->ops; |
6b8d4a6a JR |
874 | |
875 | BT_DBG("chan %p pchan %p", chan, pchan); | |
876 | ||
2b293490 | 877 | return chan; |
6b8d4a6a JR |
878 | } |
879 | ||
18722c24 JR |
880 | static void delete_netdev(struct work_struct *work) |
881 | { | |
2e4d60cb AA |
882 | struct lowpan_btle_dev *entry = container_of(work, |
883 | struct lowpan_btle_dev, | |
884 | delete_netdev); | |
18722c24 | 885 | |
00f59314 | 886 | lowpan_unregister_netdev(entry->netdev); |
18722c24 | 887 | |
2ad88fb2 | 888 | /* The entry pointer is deleted by the netdev destructor. */ |
18722c24 JR |
889 | } |
890 | ||
6b8d4a6a | 891 | static void chan_close_cb(struct l2cap_chan *chan) |
18722c24 | 892 | { |
2e4d60cb AA |
893 | struct lowpan_btle_dev *entry; |
894 | struct lowpan_btle_dev *dev = NULL; | |
18722c24 JR |
895 | struct lowpan_peer *peer; |
896 | int err = -ENOENT; | |
f63666d2 | 897 | bool last = false, remove = true; |
18722c24 | 898 | |
6b8d4a6a JR |
899 | BT_DBG("chan %p conn %p", chan, chan->conn); |
900 | ||
901 | if (chan->conn && chan->conn->hcon) { | |
902 | if (!is_bt_6lowpan(chan->conn->hcon)) | |
903 | return; | |
904 | ||
905 | /* If conn is set, then the netdev is also there and we should | |
906 | * not remove it. | |
907 | */ | |
f63666d2 | 908 | remove = false; |
6b8d4a6a | 909 | } |
18722c24 | 910 | |
90305829 | 911 | spin_lock(&devices_lock); |
18722c24 | 912 | |
90305829 | 913 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
2e4d60cb | 914 | dev = lowpan_btle_dev(entry->netdev); |
90305829 | 915 | peer = __peer_lookup_chan(dev, chan); |
18722c24 JR |
916 | if (peer) { |
917 | last = peer_del(dev, peer); | |
918 | err = 0; | |
6b8d4a6a JR |
919 | |
920 | BT_DBG("dev %p removing %speer %p", dev, | |
921 | last ? "last " : "1 ", peer); | |
922 | BT_DBG("chan %p orig refcnt %d", chan, | |
923 | atomic_read(&chan->kref.refcount)); | |
924 | ||
925 | l2cap_chan_put(chan); | |
18722c24 JR |
926 | break; |
927 | } | |
928 | } | |
929 | ||
930 | if (!err && last && dev && !atomic_read(&dev->peer_count)) { | |
90305829 | 931 | spin_unlock(&devices_lock); |
18722c24 JR |
932 | |
933 | cancel_delayed_work_sync(&dev->notify_peers); | |
934 | ||
7f118253 JR |
935 | ifdown(dev->netdev); |
936 | ||
f63666d2 | 937 | if (remove) { |
6b8d4a6a JR |
938 | INIT_WORK(&entry->delete_netdev, delete_netdev); |
939 | schedule_work(&entry->delete_netdev); | |
940 | } | |
18722c24 | 941 | } else { |
90305829 | 942 | spin_unlock(&devices_lock); |
18722c24 JR |
943 | } |
944 | ||
6b8d4a6a JR |
945 | return; |
946 | } | |
947 | ||
948 | static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err) | |
949 | { | |
950 | BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn, | |
951 | state_to_string(state), err); | |
952 | } | |
953 | ||
954 | static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan, | |
955 | unsigned long hdr_len, | |
956 | unsigned long len, int nb) | |
957 | { | |
958 | /* Note that we must allocate using GFP_ATOMIC here as | |
959 | * this function is called originally from netdev hard xmit | |
960 | * function in atomic context. | |
961 | */ | |
962 | return bt_skb_alloc(hdr_len + len, GFP_ATOMIC); | |
963 | } | |
964 | ||
965 | static void chan_suspend_cb(struct l2cap_chan *chan) | |
966 | { | |
967 | struct sk_buff *skb = chan->data; | |
968 | ||
969 | BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb); | |
970 | ||
59790aa2 JR |
971 | if (!skb) |
972 | return; | |
973 | ||
6b8d4a6a JR |
974 | lowpan_cb(skb)->status = -EAGAIN; |
975 | } | |
976 | ||
977 | static void chan_resume_cb(struct l2cap_chan *chan) | |
978 | { | |
979 | struct sk_buff *skb = chan->data; | |
980 | ||
981 | BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb); | |
982 | ||
59790aa2 JR |
983 | if (!skb) |
984 | return; | |
985 | ||
6b8d4a6a JR |
986 | lowpan_cb(skb)->status = 0; |
987 | } | |
988 | ||
989 | static long chan_get_sndtimeo_cb(struct l2cap_chan *chan) | |
990 | { | |
2ae50d8d | 991 | return L2CAP_CONN_TIMEOUT; |
6b8d4a6a JR |
992 | } |
993 | ||
994 | static const struct l2cap_ops bt_6lowpan_chan_ops = { | |
995 | .name = "L2CAP 6LoWPAN channel", | |
996 | .new_connection = chan_new_conn_cb, | |
997 | .recv = chan_recv_cb, | |
998 | .close = chan_close_cb, | |
999 | .state_change = chan_state_change_cb, | |
1000 | .ready = chan_ready_cb, | |
1001 | .resume = chan_resume_cb, | |
1002 | .suspend = chan_suspend_cb, | |
1003 | .get_sndtimeo = chan_get_sndtimeo_cb, | |
1004 | .alloc_skb = chan_alloc_skb_cb, | |
6b8d4a6a JR |
1005 | |
1006 | .teardown = l2cap_chan_no_teardown, | |
1007 | .defer = l2cap_chan_no_defer, | |
1008 | .set_shutdown = l2cap_chan_no_set_shutdown, | |
1009 | }; | |
1010 | ||
1011 | static inline __u8 bdaddr_type(__u8 type) | |
1012 | { | |
1013 | if (type == ADDR_LE_DEV_PUBLIC) | |
1014 | return BDADDR_LE_PUBLIC; | |
1015 | else | |
1016 | return BDADDR_LE_RANDOM; | |
1017 | } | |
1018 | ||
6b8d4a6a JR |
1019 | static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type) |
1020 | { | |
0cd088fc | 1021 | struct l2cap_chan *chan; |
6b8d4a6a JR |
1022 | int err; |
1023 | ||
26d46dff | 1024 | chan = chan_create(); |
0cd088fc | 1025 | if (!chan) |
6b8d4a6a JR |
1026 | return -EINVAL; |
1027 | ||
26d46dff JH |
1028 | chan->ops = &bt_6lowpan_chan_ops; |
1029 | ||
0cd088fc | 1030 | err = l2cap_chan_connect(chan, cpu_to_le16(L2CAP_PSM_IPSP), 0, |
6b8d4a6a JR |
1031 | addr, dst_type); |
1032 | ||
0cd088fc | 1033 | BT_DBG("chan %p err %d", chan, err); |
6b8d4a6a | 1034 | if (err < 0) |
0cd088fc | 1035 | l2cap_chan_put(chan); |
6b8d4a6a | 1036 | |
18722c24 JR |
1037 | return err; |
1038 | } | |
1039 | ||
6b8d4a6a JR |
1040 | static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type) |
1041 | { | |
1042 | struct lowpan_peer *peer; | |
1043 | ||
1044 | BT_DBG("conn %p dst type %d", conn, dst_type); | |
1045 | ||
1046 | peer = lookup_peer(conn); | |
1047 | if (!peer) | |
1048 | return -ENOENT; | |
1049 | ||
1050 | BT_DBG("peer %p chan %p", peer, peer->chan); | |
1051 | ||
1052 | l2cap_chan_close(peer->chan, ENOENT); | |
1053 | ||
1054 | return 0; | |
1055 | } | |
1056 | ||
1057 | static struct l2cap_chan *bt_6lowpan_listen(void) | |
1058 | { | |
1059 | bdaddr_t *addr = BDADDR_ANY; | |
0cd088fc | 1060 | struct l2cap_chan *chan; |
6b8d4a6a JR |
1061 | int err; |
1062 | ||
7b2ed60e | 1063 | if (!enable_6lowpan) |
6b8d4a6a JR |
1064 | return NULL; |
1065 | ||
26d46dff | 1066 | chan = chan_create(); |
0cd088fc | 1067 | if (!chan) |
6b8d4a6a JR |
1068 | return NULL; |
1069 | ||
26d46dff | 1070 | chan->ops = &bt_6lowpan_chan_ops; |
0cd088fc JH |
1071 | chan->state = BT_LISTEN; |
1072 | chan->src_type = BDADDR_LE_PUBLIC; | |
6b8d4a6a | 1073 | |
0cd088fc | 1074 | atomic_set(&chan->nesting, L2CAP_NESTING_PARENT); |
2773b024 | 1075 | |
0cd088fc | 1076 | BT_DBG("chan %p src type %d", chan, chan->src_type); |
6b8d4a6a | 1077 | |
0cd088fc | 1078 | err = l2cap_add_psm(chan, addr, cpu_to_le16(L2CAP_PSM_IPSP)); |
6b8d4a6a | 1079 | if (err) { |
0cd088fc | 1080 | l2cap_chan_put(chan); |
6b8d4a6a JR |
1081 | BT_ERR("psm cannot be added err %d", err); |
1082 | return NULL; | |
1083 | } | |
1084 | ||
0cd088fc | 1085 | return chan; |
6b8d4a6a JR |
1086 | } |
1087 | ||
1088 | static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type, | |
1089 | struct l2cap_conn **conn) | |
1090 | { | |
1091 | struct hci_conn *hcon; | |
1092 | struct hci_dev *hdev; | |
1093 | bdaddr_t *src = BDADDR_ANY; | |
1094 | int n; | |
1095 | ||
1096 | n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu", | |
1097 | &addr->b[5], &addr->b[4], &addr->b[3], | |
1098 | &addr->b[2], &addr->b[1], &addr->b[0], | |
1099 | addr_type); | |
1100 | ||
1101 | if (n < 7) | |
1102 | return -EINVAL; | |
1103 | ||
1104 | hdev = hci_get_route(addr, src); | |
1105 | if (!hdev) | |
1106 | return -ENOENT; | |
1107 | ||
1108 | hci_dev_lock(hdev); | |
f5ad4ffc | 1109 | hcon = hci_conn_hash_lookup_le(hdev, addr, *addr_type); |
6b8d4a6a JR |
1110 | hci_dev_unlock(hdev); |
1111 | ||
1112 | if (!hcon) | |
1113 | return -ENOENT; | |
1114 | ||
1115 | *conn = (struct l2cap_conn *)hcon->l2cap_data; | |
1116 | ||
1117 | BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type); | |
1118 | ||
1119 | return 0; | |
1120 | } | |
1121 | ||
1122 | static void disconnect_all_peers(void) | |
1123 | { | |
2e4d60cb | 1124 | struct lowpan_btle_dev *entry; |
6b8d4a6a JR |
1125 | struct lowpan_peer *peer, *tmp_peer, *new_peer; |
1126 | struct list_head peers; | |
6b8d4a6a JR |
1127 | |
1128 | INIT_LIST_HEAD(&peers); | |
1129 | ||
1130 | /* We make a separate list of peers as the close_cb() will | |
1131 | * modify the device peers list so it is better not to mess | |
1132 | * with the same list at the same time. | |
1133 | */ | |
1134 | ||
90305829 | 1135 | rcu_read_lock(); |
6b8d4a6a | 1136 | |
90305829 JR |
1137 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
1138 | list_for_each_entry_rcu(peer, &entry->peers, list) { | |
6b8d4a6a JR |
1139 | new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC); |
1140 | if (!new_peer) | |
1141 | break; | |
1142 | ||
1143 | new_peer->chan = peer->chan; | |
1144 | INIT_LIST_HEAD(&new_peer->list); | |
1145 | ||
1146 | list_add(&new_peer->list, &peers); | |
1147 | } | |
1148 | } | |
1149 | ||
90305829 | 1150 | rcu_read_unlock(); |
6b8d4a6a | 1151 | |
90305829 | 1152 | spin_lock(&devices_lock); |
6b8d4a6a JR |
1153 | list_for_each_entry_safe(peer, tmp_peer, &peers, list) { |
1154 | l2cap_chan_close(peer->chan, ENOENT); | |
90305829 JR |
1155 | |
1156 | list_del_rcu(&peer->list); | |
4e790226 | 1157 | kfree_rcu(peer, rcu); |
6b8d4a6a | 1158 | } |
90305829 | 1159 | spin_unlock(&devices_lock); |
6b8d4a6a JR |
1160 | } |
1161 | ||
7b2ed60e | 1162 | struct set_enable { |
90305829 | 1163 | struct work_struct work; |
7b2ed60e | 1164 | bool flag; |
90305829 | 1165 | }; |
6b8d4a6a | 1166 | |
7b2ed60e | 1167 | static void do_enable_set(struct work_struct *work) |
90305829 | 1168 | { |
7b2ed60e JR |
1169 | struct set_enable *set_enable = container_of(work, |
1170 | struct set_enable, work); | |
90305829 | 1171 | |
7b2ed60e | 1172 | if (!set_enable->flag || enable_6lowpan != set_enable->flag) |
6b8d4a6a | 1173 | /* Disconnect existing connections if 6lowpan is |
7b2ed60e | 1174 | * disabled |
6b8d4a6a JR |
1175 | */ |
1176 | disconnect_all_peers(); | |
1177 | ||
7b2ed60e | 1178 | enable_6lowpan = set_enable->flag; |
6b8d4a6a JR |
1179 | |
1180 | if (listen_chan) { | |
1181 | l2cap_chan_close(listen_chan, 0); | |
1182 | l2cap_chan_put(listen_chan); | |
1183 | } | |
1184 | ||
1185 | listen_chan = bt_6lowpan_listen(); | |
1186 | ||
7b2ed60e | 1187 | kfree(set_enable); |
90305829 JR |
1188 | } |
1189 | ||
7b2ed60e | 1190 | static int lowpan_enable_set(void *data, u64 val) |
90305829 | 1191 | { |
7b2ed60e | 1192 | struct set_enable *set_enable; |
90305829 | 1193 | |
7b2ed60e JR |
1194 | set_enable = kzalloc(sizeof(*set_enable), GFP_KERNEL); |
1195 | if (!set_enable) | |
90305829 JR |
1196 | return -ENOMEM; |
1197 | ||
7b2ed60e JR |
1198 | set_enable->flag = !!val; |
1199 | INIT_WORK(&set_enable->work, do_enable_set); | |
90305829 | 1200 | |
7b2ed60e | 1201 | schedule_work(&set_enable->work); |
90305829 | 1202 | |
6b8d4a6a JR |
1203 | return 0; |
1204 | } | |
1205 | ||
7b2ed60e | 1206 | static int lowpan_enable_get(void *data, u64 *val) |
6b8d4a6a | 1207 | { |
7b2ed60e | 1208 | *val = enable_6lowpan; |
6b8d4a6a JR |
1209 | return 0; |
1210 | } | |
1211 | ||
7b2ed60e JR |
1212 | DEFINE_SIMPLE_ATTRIBUTE(lowpan_enable_fops, lowpan_enable_get, |
1213 | lowpan_enable_set, "%llu\n"); | |
6b8d4a6a JR |
1214 | |
1215 | static ssize_t lowpan_control_write(struct file *fp, | |
1216 | const char __user *user_buffer, | |
1217 | size_t count, | |
1218 | loff_t *position) | |
1219 | { | |
1220 | char buf[32]; | |
1221 | size_t buf_size = min(count, sizeof(buf) - 1); | |
1222 | int ret; | |
1223 | bdaddr_t addr; | |
1224 | u8 addr_type; | |
1225 | struct l2cap_conn *conn = NULL; | |
1226 | ||
1227 | if (copy_from_user(buf, user_buffer, buf_size)) | |
1228 | return -EFAULT; | |
1229 | ||
1230 | buf[buf_size] = '\0'; | |
1231 | ||
1232 | if (memcmp(buf, "connect ", 8) == 0) { | |
1233 | ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn); | |
1234 | if (ret == -EINVAL) | |
1235 | return ret; | |
1236 | ||
1237 | if (listen_chan) { | |
1238 | l2cap_chan_close(listen_chan, 0); | |
1239 | l2cap_chan_put(listen_chan); | |
1240 | listen_chan = NULL; | |
1241 | } | |
1242 | ||
1243 | if (conn) { | |
1244 | struct lowpan_peer *peer; | |
1245 | ||
1246 | if (!is_bt_6lowpan(conn->hcon)) | |
1247 | return -EINVAL; | |
1248 | ||
1249 | peer = lookup_peer(conn); | |
1250 | if (peer) { | |
1251 | BT_DBG("6LoWPAN connection already exists"); | |
1252 | return -EALREADY; | |
1253 | } | |
1254 | ||
1255 | BT_DBG("conn %p dst %pMR type %d user %d", conn, | |
1256 | &conn->hcon->dst, conn->hcon->dst_type, | |
1257 | addr_type); | |
1258 | } | |
1259 | ||
1260 | ret = bt_6lowpan_connect(&addr, addr_type); | |
1261 | if (ret < 0) | |
1262 | return ret; | |
1263 | ||
1264 | return count; | |
1265 | } | |
1266 | ||
1267 | if (memcmp(buf, "disconnect ", 11) == 0) { | |
1268 | ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn); | |
1269 | if (ret < 0) | |
1270 | return ret; | |
1271 | ||
1272 | ret = bt_6lowpan_disconnect(conn, addr_type); | |
1273 | if (ret < 0) | |
1274 | return ret; | |
1275 | ||
1276 | return count; | |
1277 | } | |
1278 | ||
1279 | return count; | |
1280 | } | |
1281 | ||
1282 | static int lowpan_control_show(struct seq_file *f, void *ptr) | |
1283 | { | |
2e4d60cb | 1284 | struct lowpan_btle_dev *entry; |
90305829 | 1285 | struct lowpan_peer *peer; |
6b8d4a6a | 1286 | |
90305829 | 1287 | spin_lock(&devices_lock); |
6b8d4a6a | 1288 | |
90305829 JR |
1289 | list_for_each_entry(entry, &bt_6lowpan_devices, list) { |
1290 | list_for_each_entry(peer, &entry->peers, list) | |
6b8d4a6a JR |
1291 | seq_printf(f, "%pMR (type %u)\n", |
1292 | &peer->chan->dst, peer->chan->dst_type); | |
1293 | } | |
1294 | ||
90305829 | 1295 | spin_unlock(&devices_lock); |
6b8d4a6a JR |
1296 | |
1297 | return 0; | |
1298 | } | |
1299 | ||
1300 | static int lowpan_control_open(struct inode *inode, struct file *file) | |
1301 | { | |
1302 | return single_open(file, lowpan_control_show, inode->i_private); | |
1303 | } | |
1304 | ||
1305 | static const struct file_operations lowpan_control_fops = { | |
1306 | .open = lowpan_control_open, | |
1307 | .read = seq_read, | |
1308 | .write = lowpan_control_write, | |
1309 | .llseek = seq_lseek, | |
1310 | .release = single_release, | |
1311 | }; | |
1312 | ||
7f118253 JR |
1313 | static void disconnect_devices(void) |
1314 | { | |
2e4d60cb | 1315 | struct lowpan_btle_dev *entry, *tmp, *new_dev; |
7f118253 | 1316 | struct list_head devices; |
7f118253 JR |
1317 | |
1318 | INIT_LIST_HEAD(&devices); | |
1319 | ||
1320 | /* We make a separate list of devices because the unregister_netdev() | |
1321 | * will call device_event() which will also want to modify the same | |
1322 | * devices list. | |
1323 | */ | |
1324 | ||
90305829 | 1325 | rcu_read_lock(); |
7f118253 | 1326 | |
90305829 | 1327 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
7f118253 JR |
1328 | new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC); |
1329 | if (!new_dev) | |
1330 | break; | |
1331 | ||
1332 | new_dev->netdev = entry->netdev; | |
1333 | INIT_LIST_HEAD(&new_dev->list); | |
1334 | ||
90305829 | 1335 | list_add_rcu(&new_dev->list, &devices); |
7f118253 JR |
1336 | } |
1337 | ||
90305829 | 1338 | rcu_read_unlock(); |
7f118253 | 1339 | |
daac197c | 1340 | list_for_each_entry_safe(entry, tmp, &devices, list) { |
7f118253 JR |
1341 | ifdown(entry->netdev); |
1342 | BT_DBG("Unregistering netdev %s %p", | |
1343 | entry->netdev->name, entry->netdev); | |
00f59314 | 1344 | lowpan_unregister_netdev(entry->netdev); |
7f118253 JR |
1345 | kfree(entry); |
1346 | } | |
1347 | } | |
1348 | ||
18722c24 JR |
1349 | static int device_event(struct notifier_block *unused, |
1350 | unsigned long event, void *ptr) | |
1351 | { | |
1352 | struct net_device *netdev = netdev_notifier_info_to_dev(ptr); | |
2e4d60cb | 1353 | struct lowpan_btle_dev *entry; |
18722c24 JR |
1354 | |
1355 | if (netdev->type != ARPHRD_6LOWPAN) | |
1356 | return NOTIFY_DONE; | |
1357 | ||
1358 | switch (event) { | |
1359 | case NETDEV_UNREGISTER: | |
90305829 JR |
1360 | spin_lock(&devices_lock); |
1361 | list_for_each_entry(entry, &bt_6lowpan_devices, list) { | |
18722c24 | 1362 | if (entry->netdev == netdev) { |
7f118253 JR |
1363 | BT_DBG("Unregistered netdev %s %p", |
1364 | netdev->name, netdev); | |
18722c24 | 1365 | list_del(&entry->list); |
18722c24 JR |
1366 | break; |
1367 | } | |
1368 | } | |
90305829 | 1369 | spin_unlock(&devices_lock); |
18722c24 JR |
1370 | break; |
1371 | } | |
1372 | ||
1373 | return NOTIFY_DONE; | |
1374 | } | |
1375 | ||
1376 | static struct notifier_block bt_6lowpan_dev_notifier = { | |
1377 | .notifier_call = device_event, | |
1378 | }; | |
1379 | ||
5547e48c | 1380 | static int __init bt_6lowpan_init(void) |
18722c24 | 1381 | { |
7b2ed60e JR |
1382 | lowpan_enable_debugfs = debugfs_create_file("6lowpan_enable", 0644, |
1383 | bt_debugfs, NULL, | |
1384 | &lowpan_enable_fops); | |
6b8d4a6a JR |
1385 | lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644, |
1386 | bt_debugfs, NULL, | |
1387 | &lowpan_control_fops); | |
1388 | ||
18722c24 JR |
1389 | return register_netdevice_notifier(&bt_6lowpan_dev_notifier); |
1390 | } | |
1391 | ||
5547e48c | 1392 | static void __exit bt_6lowpan_exit(void) |
18722c24 | 1393 | { |
7b2ed60e | 1394 | debugfs_remove(lowpan_enable_debugfs); |
6b8d4a6a JR |
1395 | debugfs_remove(lowpan_control_debugfs); |
1396 | ||
1397 | if (listen_chan) { | |
1398 | l2cap_chan_close(listen_chan, 0); | |
1399 | l2cap_chan_put(listen_chan); | |
1400 | } | |
1401 | ||
7f118253 JR |
1402 | disconnect_devices(); |
1403 | ||
18722c24 JR |
1404 | unregister_netdevice_notifier(&bt_6lowpan_dev_notifier); |
1405 | } | |
5547e48c JR |
1406 | |
1407 | module_init(bt_6lowpan_init); | |
1408 | module_exit(bt_6lowpan_exit); | |
1409 | ||
1410 | MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>"); | |
1411 | MODULE_DESCRIPTION("Bluetooth 6LoWPAN"); | |
1412 | MODULE_VERSION(VERSION); | |
1413 | MODULE_LICENSE("GPL"); |