Commit | Line | Data |
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9ec76716 SL |
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> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
9ec76716 | 29 | #include <net/sock.h> |
f0166e5e DES |
30 | #include <net/af_ieee802154.h> |
31 | #include <net/ieee802154.h> | |
32 | #include <net/ieee802154_netdev.h> | |
9ec76716 SL |
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 | ||
9ec76716 SL |
44 | struct ieee802154_addr src_addr; |
45 | struct ieee802154_addr dst_addr; | |
74eda55d DB |
46 | |
47 | unsigned bound:1; | |
99eb8558 | 48 | unsigned want_ack:1; |
9ec76716 SL |
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 | ||
9ec76716 SL |
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; | |
99eb8558 | 78 | ro->want_ack = 1; |
9ec76716 SL |
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); | |
74eda55d | 92 | int err = -EINVAL; |
9ec76716 SL |
93 | struct net_device *dev; |
94 | ||
74eda55d DB |
95 | lock_sock(sk); |
96 | ||
9ec76716 SL |
97 | ro->bound = 0; |
98 | ||
99 | if (len < sizeof(*addr)) | |
74eda55d | 100 | goto out; |
9ec76716 SL |
101 | |
102 | if (addr->family != AF_IEEE802154) | |
74eda55d | 103 | goto out; |
9ec76716 SL |
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; | |
74eda55d | 119 | err = 0; |
9ec76716 SL |
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 | { | |
31e6d363 ED |
133 | int amount = sk_wmem_alloc_get(sk); |
134 | ||
9ec76716 SL |
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 | ||
99eb8558 DB |
242 | mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA; |
243 | if (ro->want_ack) | |
244 | mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ; | |
245 | ||
9ec76716 SL |
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) { | |
e5241c44 | 259 | pr_debug("size = %Zu, mtu = %u\n", size, mtu); |
9ec76716 SL |
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 | ||
3b885787 | 307 | sock_recv_ts_and_drops(msg, sk, skb); |
9ec76716 SL |
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) { | |
9ec76716 SL |
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 | ||
a9dfac33 DES |
386 | static int dgram_getsockopt(struct sock *sk, int level, int optname, |
387 | char __user *optval, int __user *optlen) | |
388 | { | |
99eb8558 DB |
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; | |
a9dfac33 DES |
414 | } |
415 | ||
416 | static int dgram_setsockopt(struct sock *sk, int level, int optname, | |
b7058842 | 417 | char __user *optval, unsigned int optlen) |
a9dfac33 | 418 | { |
99eb8558 DB |
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; | |
a9dfac33 DES |
442 | } |
443 | ||
9ec76716 SL |
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, | |
a9dfac33 DES |
458 | .getsockopt = dgram_getsockopt, |
459 | .setsockopt = dgram_setsockopt, | |
9ec76716 SL |
460 | }; |
461 |