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1 | /* |
2 | * ZigBee socket interface |
3 | * |
4 | * Copyright 2007, 2008 Siemens AG |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License version 2 |
8 | * as published by the Free Software Foundation. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | * GNU General Public License for more details. |
14 | * |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
18 | * |
19 | * Written by: |
20 | * Sergey Lapin <slapin@ossfans.org> |
21 | * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> |
22 | */ |
23 | |
24 | #include <linux/net.h> |
25 | #include <linux/module.h> |
26 | #include <linux/if_arp.h> |
27 | #include <linux/list.h> |
28 | #include <linux/slab.h> |
29 | #include <net/sock.h> |
30 | #include <net/af_ieee802154.h> |
31 | #include <net/ieee802154.h> |
32 | #include <net/ieee802154_netdev.h> |
33 | |
34 | #include <asm/ioctls.h> |
35 | |
36 | #include "af802154.h" |
37 | |
38 | static HLIST_HEAD(dgram_head); |
39 | static DEFINE_RWLOCK(dgram_lock); |
40 | |
41 | struct dgram_sock { |
42 | struct sock sk; |
43 | |
44 | struct ieee802154_addr src_addr; |
45 | struct ieee802154_addr dst_addr; |
46 | |
47 | unsigned bound:1; |
48 | unsigned want_ack:1; |
49 | }; |
50 | |
51 | static inline struct dgram_sock *dgram_sk(const struct sock *sk) |
52 | { |
53 | return container_of(sk, struct dgram_sock, sk); |
54 | } |
55 | |
56 | static void dgram_hash(struct sock *sk) |
57 | { |
58 | write_lock_bh(&dgram_lock); |
59 | sk_add_node(sk, &dgram_head); |
60 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
61 | write_unlock_bh(&dgram_lock); |
62 | } |
63 | |
64 | static void dgram_unhash(struct sock *sk) |
65 | { |
66 | write_lock_bh(&dgram_lock); |
67 | if (sk_del_node_init(sk)) |
68 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
69 | write_unlock_bh(&dgram_lock); |
70 | } |
71 | |
72 | static int dgram_init(struct sock *sk) |
73 | { |
74 | struct dgram_sock *ro = dgram_sk(sk); |
75 | |
76 | ro->dst_addr.addr_type = IEEE802154_ADDR_LONG; |
77 | ro->dst_addr.pan_id = 0xffff; |
78 | ro->want_ack = 1; |
79 | memset(&ro->dst_addr.hwaddr, 0xff, sizeof(ro->dst_addr.hwaddr)); |
80 | return 0; |
81 | } |
82 | |
83 | static void dgram_close(struct sock *sk, long timeout) |
84 | { |
85 | sk_common_release(sk); |
86 | } |
87 | |
88 | static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len) |
89 | { |
90 | struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr; |
91 | struct dgram_sock *ro = dgram_sk(sk); |
92 | int err = -EINVAL; |
93 | struct net_device *dev; |
94 | |
95 | lock_sock(sk); |
96 | |
97 | ro->bound = 0; |
98 | |
99 | if (len < sizeof(*addr)) |
100 | goto out; |
101 | |
102 | if (addr->family != AF_IEEE802154) |
103 | goto out; |
104 | |
105 | dev = ieee802154_get_dev(sock_net(sk), &addr->addr); |
106 | if (!dev) { |
107 | err = -ENODEV; |
108 | goto out; |
109 | } |
110 | |
111 | if (dev->type != ARPHRD_IEEE802154) { |
112 | err = -ENODEV; |
113 | goto out_put; |
114 | } |
115 | |
116 | memcpy(&ro->src_addr, &addr->addr, sizeof(struct ieee802154_addr)); |
117 | |
118 | ro->bound = 1; |
119 | err = 0; |
120 | out_put: |
121 | dev_put(dev); |
122 | out: |
123 | release_sock(sk); |
124 | |
125 | return err; |
126 | } |
127 | |
128 | static int dgram_ioctl(struct sock *sk, int cmd, unsigned long arg) |
129 | { |
130 | switch (cmd) { |
131 | case SIOCOUTQ: |
132 | { |
133 | int amount = sk_wmem_alloc_get(sk); |
134 | |
135 | return put_user(amount, (int __user *)arg); |
136 | } |
137 | |
138 | case SIOCINQ: |
139 | { |
140 | struct sk_buff *skb; |
141 | unsigned long amount; |
142 | |
143 | amount = 0; |
144 | spin_lock_bh(&sk->sk_receive_queue.lock); |
145 | skb = skb_peek(&sk->sk_receive_queue); |
146 | if (skb != NULL) { |
147 | /* |
148 | * We will only return the amount |
149 | * of this packet since that is all |
150 | * that will be read. |
151 | */ |
152 | /* FIXME: parse the header for more correct value */ |
153 | amount = skb->len - (3+8+8); |
154 | } |
155 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
156 | return put_user(amount, (int __user *)arg); |
157 | } |
158 | |
159 | } |
160 | return -ENOIOCTLCMD; |
161 | } |
162 | |
163 | /* FIXME: autobind */ |
164 | static int dgram_connect(struct sock *sk, struct sockaddr *uaddr, |
165 | int len) |
166 | { |
167 | struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr; |
168 | struct dgram_sock *ro = dgram_sk(sk); |
169 | int err = 0; |
170 | |
171 | if (len < sizeof(*addr)) |
172 | return -EINVAL; |
173 | |
174 | if (addr->family != AF_IEEE802154) |
175 | return -EINVAL; |
176 | |
177 | lock_sock(sk); |
178 | |
179 | if (!ro->bound) { |
180 | err = -ENETUNREACH; |
181 | goto out; |
182 | } |
183 | |
184 | memcpy(&ro->dst_addr, &addr->addr, sizeof(struct ieee802154_addr)); |
185 | |
186 | out: |
187 | release_sock(sk); |
188 | return err; |
189 | } |
190 | |
191 | static int dgram_disconnect(struct sock *sk, int flags) |
192 | { |
193 | struct dgram_sock *ro = dgram_sk(sk); |
194 | |
195 | lock_sock(sk); |
196 | |
197 | ro->dst_addr.addr_type = IEEE802154_ADDR_LONG; |
198 | memset(&ro->dst_addr.hwaddr, 0xff, sizeof(ro->dst_addr.hwaddr)); |
199 | |
200 | release_sock(sk); |
201 | |
202 | return 0; |
203 | } |
204 | |
205 | static int dgram_sendmsg(struct kiocb *iocb, struct sock *sk, |
206 | struct msghdr *msg, size_t size) |
207 | { |
208 | struct net_device *dev; |
209 | unsigned mtu; |
210 | struct sk_buff *skb; |
211 | struct dgram_sock *ro = dgram_sk(sk); |
212 | int err; |
213 | |
214 | if (msg->msg_flags & MSG_OOB) { |
215 | pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags); |
216 | return -EOPNOTSUPP; |
217 | } |
218 | |
219 | if (!ro->bound) |
220 | dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154); |
221 | else |
222 | dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr); |
223 | |
224 | if (!dev) { |
225 | pr_debug("no dev\n"); |
226 | err = -ENXIO; |
227 | goto out; |
228 | } |
229 | mtu = dev->mtu; |
230 | pr_debug("name = %s, mtu = %u\n", dev->name, mtu); |
231 | |
232 | skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + size, |
233 | msg->msg_flags & MSG_DONTWAIT, |
234 | &err); |
235 | if (!skb) |
236 | goto out_dev; |
237 | |
238 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
239 | |
240 | skb_reset_network_header(skb); |
241 | |
242 | mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA; |
243 | if (ro->want_ack) |
244 | mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ; |
245 | |
246 | mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev); |
247 | err = dev_hard_header(skb, dev, ETH_P_IEEE802154, &ro->dst_addr, |
248 | ro->bound ? &ro->src_addr : NULL, size); |
249 | if (err < 0) |
250 | goto out_skb; |
251 | |
252 | skb_reset_mac_header(skb); |
253 | |
254 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); |
255 | if (err < 0) |
256 | goto out_skb; |
257 | |
258 | if (size > mtu) { |
259 | pr_debug("size = %Zu, mtu = %u\n", size, mtu); |
260 | err = -EINVAL; |
261 | goto out_skb; |
262 | } |
263 | |
264 | skb->dev = dev; |
265 | skb->sk = sk; |
266 | skb->protocol = htons(ETH_P_IEEE802154); |
267 | |
268 | dev_put(dev); |
269 | |
270 | err = dev_queue_xmit(skb); |
271 | if (err > 0) |
272 | err = net_xmit_errno(err); |
273 | |
274 | return err ?: size; |
275 | |
276 | out_skb: |
277 | kfree_skb(skb); |
278 | out_dev: |
279 | dev_put(dev); |
280 | out: |
281 | return err; |
282 | } |
283 | |
284 | static int dgram_recvmsg(struct kiocb *iocb, struct sock *sk, |
285 | struct msghdr *msg, size_t len, int noblock, int flags, |
286 | int *addr_len) |
287 | { |
288 | size_t copied = 0; |
289 | int err = -EOPNOTSUPP; |
290 | struct sk_buff *skb; |
291 | |
292 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
293 | if (!skb) |
294 | goto out; |
295 | |
296 | copied = skb->len; |
297 | if (len < copied) { |
298 | msg->msg_flags |= MSG_TRUNC; |
299 | copied = len; |
300 | } |
301 | |
302 | /* FIXME: skip headers if necessary ?! */ |
303 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
304 | if (err) |
305 | goto done; |
306 | |
307 | sock_recv_ts_and_drops(msg, sk, skb); |
308 | |
309 | if (flags & MSG_TRUNC) |
310 | copied = skb->len; |
311 | done: |
312 | skb_free_datagram(sk, skb); |
313 | out: |
314 | if (err) |
315 | return err; |
316 | return copied; |
317 | } |
318 | |
319 | static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb) |
320 | { |
321 | if (sock_queue_rcv_skb(sk, skb) < 0) { |
322 | kfree_skb(skb); |
323 | return NET_RX_DROP; |
324 | } |
325 | |
326 | return NET_RX_SUCCESS; |
327 | } |
328 | |
329 | static inline int ieee802154_match_sock(u8 *hw_addr, u16 pan_id, |
330 | u16 short_addr, struct dgram_sock *ro) |
331 | { |
332 | if (!ro->bound) |
333 | return 1; |
334 | |
335 | if (ro->src_addr.addr_type == IEEE802154_ADDR_LONG && |
336 | !memcmp(ro->src_addr.hwaddr, hw_addr, IEEE802154_ADDR_LEN)) |
337 | return 1; |
338 | |
339 | if (ro->src_addr.addr_type == IEEE802154_ADDR_SHORT && |
340 | pan_id == ro->src_addr.pan_id && |
341 | short_addr == ro->src_addr.short_addr) |
342 | return 1; |
343 | |
344 | return 0; |
345 | } |
346 | |
347 | int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb) |
348 | { |
349 | struct sock *sk, *prev = NULL; |
350 | struct hlist_node *node; |
351 | int ret = NET_RX_SUCCESS; |
352 | u16 pan_id, short_addr; |
353 | |
354 | /* Data frame processing */ |
355 | BUG_ON(dev->type != ARPHRD_IEEE802154); |
356 | |
357 | pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev); |
358 | short_addr = ieee802154_mlme_ops(dev)->get_short_addr(dev); |
359 | |
360 | read_lock(&dgram_lock); |
361 | sk_for_each(sk, node, &dgram_head) { |
362 | if (ieee802154_match_sock(dev->dev_addr, pan_id, short_addr, |
363 | dgram_sk(sk))) { |
364 | if (prev) { |
365 | struct sk_buff *clone; |
366 | clone = skb_clone(skb, GFP_ATOMIC); |
367 | if (clone) |
368 | dgram_rcv_skb(prev, clone); |
369 | } |
370 | |
371 | prev = sk; |
372 | } |
373 | } |
374 | |
375 | if (prev) |
376 | dgram_rcv_skb(prev, skb); |
377 | else { |
378 | kfree_skb(skb); |
379 | ret = NET_RX_DROP; |
380 | } |
381 | read_unlock(&dgram_lock); |
382 | |
383 | return ret; |
384 | } |
385 | |
386 | static int dgram_getsockopt(struct sock *sk, int level, int optname, |
387 | char __user *optval, int __user *optlen) |
388 | { |
389 | struct dgram_sock *ro = dgram_sk(sk); |
390 | |
391 | int val, len; |
392 | |
393 | if (level != SOL_IEEE802154) |
394 | return -EOPNOTSUPP; |
395 | |
396 | if (get_user(len, optlen)) |
397 | return -EFAULT; |
398 | |
399 | len = min_t(unsigned int, len, sizeof(int)); |
400 | |
401 | switch (optname) { |
402 | case WPAN_WANTACK: |
403 | val = ro->want_ack; |
404 | break; |
405 | default: |
406 | return -ENOPROTOOPT; |
407 | } |
408 | |
409 | if (put_user(len, optlen)) |
410 | return -EFAULT; |
411 | if (copy_to_user(optval, &val, len)) |
412 | return -EFAULT; |
413 | return 0; |
414 | } |
415 | |
416 | static int dgram_setsockopt(struct sock *sk, int level, int optname, |
417 | char __user *optval, unsigned int optlen) |
418 | { |
419 | struct dgram_sock *ro = dgram_sk(sk); |
420 | int val; |
421 | int err = 0; |
422 | |
423 | if (optlen < sizeof(int)) |
424 | return -EINVAL; |
425 | |
426 | if (get_user(val, (int __user *)optval)) |
427 | return -EFAULT; |
428 | |
429 | lock_sock(sk); |
430 | |
431 | switch (optname) { |
432 | case WPAN_WANTACK: |
433 | ro->want_ack = !!val; |
434 | break; |
435 | default: |
436 | err = -ENOPROTOOPT; |
437 | break; |
438 | } |
439 | |
440 | release_sock(sk); |
441 | return err; |
442 | } |
443 | |
444 | struct proto ieee802154_dgram_prot = { |
445 | .name = "IEEE-802.15.4-MAC", |
446 | .owner = THIS_MODULE, |
447 | .obj_size = sizeof(struct dgram_sock), |
448 | .init = dgram_init, |
449 | .close = dgram_close, |
450 | .bind = dgram_bind, |
451 | .sendmsg = dgram_sendmsg, |
452 | .recvmsg = dgram_recvmsg, |
453 | .hash = dgram_hash, |
454 | .unhash = dgram_unhash, |
455 | .connect = dgram_connect, |
456 | .disconnect = dgram_disconnect, |
457 | .ioctl = dgram_ioctl, |
458 | .getsockopt = dgram_getsockopt, |
459 | .setsockopt = dgram_setsockopt, |
460 | }; |
461 | |
462 |
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