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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> | |
28 | #include <net/sock.h> | |
29 | #include <net/ieee802154/af_ieee802154.h> | |
30 | #include <net/ieee802154/mac_def.h> | |
31 | #include <net/ieee802154/netdevice.h> | |
32 | ||
33 | #include <asm/ioctls.h> | |
34 | ||
35 | #include "af802154.h" | |
36 | ||
37 | static HLIST_HEAD(dgram_head); | |
38 | static DEFINE_RWLOCK(dgram_lock); | |
39 | ||
40 | struct dgram_sock { | |
41 | struct sock sk; | |
42 | ||
43 | int bound; | |
44 | struct ieee802154_addr src_addr; | |
45 | struct ieee802154_addr dst_addr; | |
46 | }; | |
47 | ||
48 | static inline struct dgram_sock *dgram_sk(const struct sock *sk) | |
49 | { | |
50 | return container_of(sk, struct dgram_sock, sk); | |
51 | } | |
52 | ||
53 | ||
54 | static void dgram_hash(struct sock *sk) | |
55 | { | |
56 | write_lock_bh(&dgram_lock); | |
57 | sk_add_node(sk, &dgram_head); | |
58 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); | |
59 | write_unlock_bh(&dgram_lock); | |
60 | } | |
61 | ||
62 | static void dgram_unhash(struct sock *sk) | |
63 | { | |
64 | write_lock_bh(&dgram_lock); | |
65 | if (sk_del_node_init(sk)) | |
66 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); | |
67 | write_unlock_bh(&dgram_lock); | |
68 | } | |
69 | ||
70 | static int dgram_init(struct sock *sk) | |
71 | { | |
72 | struct dgram_sock *ro = dgram_sk(sk); | |
73 | ||
74 | ro->dst_addr.addr_type = IEEE802154_ADDR_LONG; | |
75 | ro->dst_addr.pan_id = 0xffff; | |
76 | memset(&ro->dst_addr.hwaddr, 0xff, sizeof(ro->dst_addr.hwaddr)); | |
77 | return 0; | |
78 | } | |
79 | ||
80 | static void dgram_close(struct sock *sk, long timeout) | |
81 | { | |
82 | sk_common_release(sk); | |
83 | } | |
84 | ||
85 | static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len) | |
86 | { | |
87 | struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr; | |
88 | struct dgram_sock *ro = dgram_sk(sk); | |
89 | int err = 0; | |
90 | struct net_device *dev; | |
91 | ||
92 | ro->bound = 0; | |
93 | ||
94 | if (len < sizeof(*addr)) | |
95 | return -EINVAL; | |
96 | ||
97 | if (addr->family != AF_IEEE802154) | |
98 | return -EINVAL; | |
99 | ||
100 | lock_sock(sk); | |
101 | ||
102 | dev = ieee802154_get_dev(sock_net(sk), &addr->addr); | |
103 | if (!dev) { | |
104 | err = -ENODEV; | |
105 | goto out; | |
106 | } | |
107 | ||
108 | if (dev->type != ARPHRD_IEEE802154) { | |
109 | err = -ENODEV; | |
110 | goto out_put; | |
111 | } | |
112 | ||
113 | memcpy(&ro->src_addr, &addr->addr, sizeof(struct ieee802154_addr)); | |
114 | ||
115 | ro->bound = 1; | |
116 | out_put: | |
117 | dev_put(dev); | |
118 | out: | |
119 | release_sock(sk); | |
120 | ||
121 | return err; | |
122 | } | |
123 | ||
124 | static int dgram_ioctl(struct sock *sk, int cmd, unsigned long arg) | |
125 | { | |
126 | switch (cmd) { | |
127 | case SIOCOUTQ: | |
128 | { | |
129 | int amount = atomic_read(&sk->sk_wmem_alloc); | |
130 | return put_user(amount, (int __user *)arg); | |
131 | } | |
132 | ||
133 | case SIOCINQ: | |
134 | { | |
135 | struct sk_buff *skb; | |
136 | unsigned long amount; | |
137 | ||
138 | amount = 0; | |
139 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
140 | skb = skb_peek(&sk->sk_receive_queue); | |
141 | if (skb != NULL) { | |
142 | /* | |
143 | * We will only return the amount | |
144 | * of this packet since that is all | |
145 | * that will be read. | |
146 | */ | |
147 | /* FIXME: parse the header for more correct value */ | |
148 | amount = skb->len - (3+8+8); | |
149 | } | |
150 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
151 | return put_user(amount, (int __user *)arg); | |
152 | } | |
153 | ||
154 | } | |
155 | return -ENOIOCTLCMD; | |
156 | } | |
157 | ||
158 | /* FIXME: autobind */ | |
159 | static int dgram_connect(struct sock *sk, struct sockaddr *uaddr, | |
160 | int len) | |
161 | { | |
162 | struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr; | |
163 | struct dgram_sock *ro = dgram_sk(sk); | |
164 | int err = 0; | |
165 | ||
166 | if (len < sizeof(*addr)) | |
167 | return -EINVAL; | |
168 | ||
169 | if (addr->family != AF_IEEE802154) | |
170 | return -EINVAL; | |
171 | ||
172 | lock_sock(sk); | |
173 | ||
174 | if (!ro->bound) { | |
175 | err = -ENETUNREACH; | |
176 | goto out; | |
177 | } | |
178 | ||
179 | memcpy(&ro->dst_addr, &addr->addr, sizeof(struct ieee802154_addr)); | |
180 | ||
181 | out: | |
182 | release_sock(sk); | |
183 | return err; | |
184 | } | |
185 | ||
186 | static int dgram_disconnect(struct sock *sk, int flags) | |
187 | { | |
188 | struct dgram_sock *ro = dgram_sk(sk); | |
189 | ||
190 | lock_sock(sk); | |
191 | ||
192 | ro->dst_addr.addr_type = IEEE802154_ADDR_LONG; | |
193 | memset(&ro->dst_addr.hwaddr, 0xff, sizeof(ro->dst_addr.hwaddr)); | |
194 | ||
195 | release_sock(sk); | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
200 | static int dgram_sendmsg(struct kiocb *iocb, struct sock *sk, | |
201 | struct msghdr *msg, size_t size) | |
202 | { | |
203 | struct net_device *dev; | |
204 | unsigned mtu; | |
205 | struct sk_buff *skb; | |
206 | struct dgram_sock *ro = dgram_sk(sk); | |
207 | int err; | |
208 | ||
209 | if (msg->msg_flags & MSG_OOB) { | |
210 | pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags); | |
211 | return -EOPNOTSUPP; | |
212 | } | |
213 | ||
214 | if (!ro->bound) | |
215 | dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154); | |
216 | else | |
217 | dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr); | |
218 | ||
219 | if (!dev) { | |
220 | pr_debug("no dev\n"); | |
221 | err = -ENXIO; | |
222 | goto out; | |
223 | } | |
224 | mtu = dev->mtu; | |
225 | pr_debug("name = %s, mtu = %u\n", dev->name, mtu); | |
226 | ||
227 | skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + size, | |
228 | msg->msg_flags & MSG_DONTWAIT, | |
229 | &err); | |
230 | if (!skb) | |
231 | goto out_dev; | |
232 | ||
233 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
234 | ||
235 | skb_reset_network_header(skb); | |
236 | ||
237 | mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA | MAC_CB_FLAG_ACKREQ; | |
238 | mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev); | |
239 | err = dev_hard_header(skb, dev, ETH_P_IEEE802154, &ro->dst_addr, | |
240 | ro->bound ? &ro->src_addr : NULL, size); | |
241 | if (err < 0) | |
242 | goto out_skb; | |
243 | ||
244 | skb_reset_mac_header(skb); | |
245 | ||
246 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); | |
247 | if (err < 0) | |
248 | goto out_skb; | |
249 | ||
250 | if (size > mtu) { | |
251 | pr_debug("size = %u, mtu = %u\n", size, mtu); | |
252 | err = -EINVAL; | |
253 | goto out_skb; | |
254 | } | |
255 | ||
256 | skb->dev = dev; | |
257 | skb->sk = sk; | |
258 | skb->protocol = htons(ETH_P_IEEE802154); | |
259 | ||
260 | dev_put(dev); | |
261 | ||
262 | err = dev_queue_xmit(skb); | |
263 | if (err > 0) | |
264 | err = net_xmit_errno(err); | |
265 | ||
266 | return err ?: size; | |
267 | ||
268 | out_skb: | |
269 | kfree_skb(skb); | |
270 | out_dev: | |
271 | dev_put(dev); | |
272 | out: | |
273 | return err; | |
274 | } | |
275 | ||
276 | static int dgram_recvmsg(struct kiocb *iocb, struct sock *sk, | |
277 | struct msghdr *msg, size_t len, int noblock, int flags, | |
278 | int *addr_len) | |
279 | { | |
280 | size_t copied = 0; | |
281 | int err = -EOPNOTSUPP; | |
282 | struct sk_buff *skb; | |
283 | ||
284 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
285 | if (!skb) | |
286 | goto out; | |
287 | ||
288 | copied = skb->len; | |
289 | if (len < copied) { | |
290 | msg->msg_flags |= MSG_TRUNC; | |
291 | copied = len; | |
292 | } | |
293 | ||
294 | /* FIXME: skip headers if necessary ?! */ | |
295 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
296 | if (err) | |
297 | goto done; | |
298 | ||
299 | sock_recv_timestamp(msg, sk, skb); | |
300 | ||
301 | if (flags & MSG_TRUNC) | |
302 | copied = skb->len; | |
303 | done: | |
304 | skb_free_datagram(sk, skb); | |
305 | out: | |
306 | if (err) | |
307 | return err; | |
308 | return copied; | |
309 | } | |
310 | ||
311 | static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
312 | { | |
313 | if (sock_queue_rcv_skb(sk, skb) < 0) { | |
314 | atomic_inc(&sk->sk_drops); | |
315 | kfree_skb(skb); | |
316 | return NET_RX_DROP; | |
317 | } | |
318 | ||
319 | return NET_RX_SUCCESS; | |
320 | } | |
321 | ||
322 | static inline int ieee802154_match_sock(u8 *hw_addr, u16 pan_id, | |
323 | u16 short_addr, struct dgram_sock *ro) | |
324 | { | |
325 | if (!ro->bound) | |
326 | return 1; | |
327 | ||
328 | if (ro->src_addr.addr_type == IEEE802154_ADDR_LONG && | |
329 | !memcmp(ro->src_addr.hwaddr, hw_addr, IEEE802154_ADDR_LEN)) | |
330 | return 1; | |
331 | ||
332 | if (ro->src_addr.addr_type == IEEE802154_ADDR_SHORT && | |
333 | pan_id == ro->src_addr.pan_id && | |
334 | short_addr == ro->src_addr.short_addr) | |
335 | return 1; | |
336 | ||
337 | return 0; | |
338 | } | |
339 | ||
340 | int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb) | |
341 | { | |
342 | struct sock *sk, *prev = NULL; | |
343 | struct hlist_node *node; | |
344 | int ret = NET_RX_SUCCESS; | |
345 | u16 pan_id, short_addr; | |
346 | ||
347 | /* Data frame processing */ | |
348 | BUG_ON(dev->type != ARPHRD_IEEE802154); | |
349 | ||
350 | pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev); | |
351 | short_addr = ieee802154_mlme_ops(dev)->get_short_addr(dev); | |
352 | ||
353 | read_lock(&dgram_lock); | |
354 | sk_for_each(sk, node, &dgram_head) { | |
355 | if (ieee802154_match_sock(dev->dev_addr, pan_id, short_addr, | |
356 | dgram_sk(sk))) { | |
357 | if (prev) { | |
358 | struct sk_buff *clone; | |
359 | clone = skb_clone(skb, GFP_ATOMIC); | |
360 | if (clone) | |
361 | dgram_rcv_skb(prev, clone); | |
362 | } | |
363 | ||
364 | prev = sk; | |
365 | } | |
366 | } | |
367 | ||
368 | if (prev) | |
369 | dgram_rcv_skb(prev, skb); | |
370 | else { | |
371 | kfree_skb(skb); | |
372 | ret = NET_RX_DROP; | |
373 | } | |
374 | read_unlock(&dgram_lock); | |
375 | ||
376 | return ret; | |
377 | } | |
378 | ||
379 | struct proto ieee802154_dgram_prot = { | |
380 | .name = "IEEE-802.15.4-MAC", | |
381 | .owner = THIS_MODULE, | |
382 | .obj_size = sizeof(struct dgram_sock), | |
383 | .init = dgram_init, | |
384 | .close = dgram_close, | |
385 | .bind = dgram_bind, | |
386 | .sendmsg = dgram_sendmsg, | |
387 | .recvmsg = dgram_recvmsg, | |
388 | .hash = dgram_hash, | |
389 | .unhash = dgram_unhash, | |
390 | .connect = dgram_connect, | |
391 | .disconnect = dgram_disconnect, | |
392 | .ioctl = dgram_ioctl, | |
393 | }; | |
394 |