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Commit | Line | Data |
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9ec76716 | 1 | /* |
5fd72607 | 2 | * IEEE 802.15.4 dgram socket interface |
9ec76716 SL |
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 | 46 | |
95c96174 ED |
47 | unsigned int bound:1; |
48 | unsigned int 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 DES |
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; | |
95c96174 | 209 | unsigned int mtu; |
9ec76716 SL |
210 | struct sk_buff *skb; |
211 | struct dgram_sock *ro = dgram_sk(sk); | |
ae641949 | 212 | int hlen, tlen; |
9ec76716 SL |
213 | int err; |
214 | ||
215 | if (msg->msg_flags & MSG_OOB) { | |
216 | pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags); | |
217 | return -EOPNOTSUPP; | |
218 | } | |
219 | ||
220 | if (!ro->bound) | |
221 | dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154); | |
222 | else | |
223 | dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr); | |
224 | ||
225 | if (!dev) { | |
226 | pr_debug("no dev\n"); | |
227 | err = -ENXIO; | |
228 | goto out; | |
229 | } | |
230 | mtu = dev->mtu; | |
231 | pr_debug("name = %s, mtu = %u\n", dev->name, mtu); | |
232 | ||
3da947b2 SL |
233 | if (size > mtu) { |
234 | pr_debug("size = %Zu, mtu = %u\n", size, mtu); | |
235 | err = -EINVAL; | |
236 | goto out_dev; | |
237 | } | |
238 | ||
ae641949 HX |
239 | hlen = LL_RESERVED_SPACE(dev); |
240 | tlen = dev->needed_tailroom; | |
241 | skb = sock_alloc_send_skb(sk, hlen + tlen + size, | |
9ec76716 SL |
242 | msg->msg_flags & MSG_DONTWAIT, |
243 | &err); | |
244 | if (!skb) | |
245 | goto out_dev; | |
246 | ||
ae641949 | 247 | skb_reserve(skb, hlen); |
9ec76716 SL |
248 | |
249 | skb_reset_network_header(skb); | |
250 | ||
99eb8558 DES |
251 | mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA; |
252 | if (ro->want_ack) | |
253 | mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ; | |
254 | ||
9ec76716 SL |
255 | mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev); |
256 | err = dev_hard_header(skb, dev, ETH_P_IEEE802154, &ro->dst_addr, | |
257 | ro->bound ? &ro->src_addr : NULL, size); | |
258 | if (err < 0) | |
259 | goto out_skb; | |
260 | ||
261 | skb_reset_mac_header(skb); | |
262 | ||
263 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); | |
264 | if (err < 0) | |
265 | goto out_skb; | |
266 | ||
9ec76716 SL |
267 | skb->dev = dev; |
268 | skb->sk = sk; | |
269 | skb->protocol = htons(ETH_P_IEEE802154); | |
270 | ||
271 | dev_put(dev); | |
272 | ||
273 | err = dev_queue_xmit(skb); | |
274 | if (err > 0) | |
275 | err = net_xmit_errno(err); | |
276 | ||
277 | return err ?: size; | |
278 | ||
279 | out_skb: | |
280 | kfree_skb(skb); | |
281 | out_dev: | |
282 | dev_put(dev); | |
283 | out: | |
284 | return err; | |
285 | } | |
286 | ||
287 | static int dgram_recvmsg(struct kiocb *iocb, struct sock *sk, | |
288 | struct msghdr *msg, size_t len, int noblock, int flags, | |
289 | int *addr_len) | |
290 | { | |
291 | size_t copied = 0; | |
292 | int err = -EOPNOTSUPP; | |
293 | struct sk_buff *skb; | |
6364e6ee SR |
294 | struct sockaddr_ieee802154 *saddr; |
295 | ||
296 | saddr = (struct sockaddr_ieee802154 *)msg->msg_name; | |
9ec76716 SL |
297 | |
298 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
299 | if (!skb) | |
300 | goto out; | |
301 | ||
302 | copied = skb->len; | |
303 | if (len < copied) { | |
304 | msg->msg_flags |= MSG_TRUNC; | |
305 | copied = len; | |
306 | } | |
307 | ||
308 | /* FIXME: skip headers if necessary ?! */ | |
309 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
310 | if (err) | |
311 | goto done; | |
312 | ||
3b885787 | 313 | sock_recv_ts_and_drops(msg, sk, skb); |
9ec76716 | 314 | |
6364e6ee SR |
315 | if (saddr) { |
316 | saddr->family = AF_IEEE802154; | |
317 | saddr->addr = mac_cb(skb)->sa; | |
318 | } | |
319 | if (addr_len) | |
320 | *addr_len = sizeof(*saddr); | |
321 | ||
9ec76716 SL |
322 | if (flags & MSG_TRUNC) |
323 | copied = skb->len; | |
324 | done: | |
325 | skb_free_datagram(sk, skb); | |
326 | out: | |
327 | if (err) | |
328 | return err; | |
329 | return copied; | |
330 | } | |
331 | ||
332 | static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
333 | { | |
334 | if (sock_queue_rcv_skb(sk, skb) < 0) { | |
9ec76716 SL |
335 | kfree_skb(skb); |
336 | return NET_RX_DROP; | |
337 | } | |
338 | ||
339 | return NET_RX_SUCCESS; | |
340 | } | |
341 | ||
342 | static inline int ieee802154_match_sock(u8 *hw_addr, u16 pan_id, | |
343 | u16 short_addr, struct dgram_sock *ro) | |
344 | { | |
345 | if (!ro->bound) | |
346 | return 1; | |
347 | ||
348 | if (ro->src_addr.addr_type == IEEE802154_ADDR_LONG && | |
349 | !memcmp(ro->src_addr.hwaddr, hw_addr, IEEE802154_ADDR_LEN)) | |
350 | return 1; | |
351 | ||
352 | if (ro->src_addr.addr_type == IEEE802154_ADDR_SHORT && | |
353 | pan_id == ro->src_addr.pan_id && | |
354 | short_addr == ro->src_addr.short_addr) | |
355 | return 1; | |
356 | ||
357 | return 0; | |
358 | } | |
359 | ||
360 | int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb) | |
361 | { | |
362 | struct sock *sk, *prev = NULL; | |
9ec76716 SL |
363 | int ret = NET_RX_SUCCESS; |
364 | u16 pan_id, short_addr; | |
365 | ||
366 | /* Data frame processing */ | |
367 | BUG_ON(dev->type != ARPHRD_IEEE802154); | |
368 | ||
369 | pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev); | |
370 | short_addr = ieee802154_mlme_ops(dev)->get_short_addr(dev); | |
371 | ||
372 | read_lock(&dgram_lock); | |
b67bfe0d | 373 | sk_for_each(sk, &dgram_head) { |
9ec76716 SL |
374 | if (ieee802154_match_sock(dev->dev_addr, pan_id, short_addr, |
375 | dgram_sk(sk))) { | |
376 | if (prev) { | |
377 | struct sk_buff *clone; | |
378 | clone = skb_clone(skb, GFP_ATOMIC); | |
379 | if (clone) | |
380 | dgram_rcv_skb(prev, clone); | |
381 | } | |
382 | ||
383 | prev = sk; | |
384 | } | |
385 | } | |
386 | ||
387 | if (prev) | |
388 | dgram_rcv_skb(prev, skb); | |
389 | else { | |
390 | kfree_skb(skb); | |
391 | ret = NET_RX_DROP; | |
392 | } | |
393 | read_unlock(&dgram_lock); | |
394 | ||
395 | return ret; | |
396 | } | |
397 | ||
a9dfac33 DES |
398 | static int dgram_getsockopt(struct sock *sk, int level, int optname, |
399 | char __user *optval, int __user *optlen) | |
400 | { | |
99eb8558 DES |
401 | struct dgram_sock *ro = dgram_sk(sk); |
402 | ||
403 | int val, len; | |
404 | ||
405 | if (level != SOL_IEEE802154) | |
406 | return -EOPNOTSUPP; | |
407 | ||
408 | if (get_user(len, optlen)) | |
409 | return -EFAULT; | |
410 | ||
411 | len = min_t(unsigned int, len, sizeof(int)); | |
412 | ||
413 | switch (optname) { | |
414 | case WPAN_WANTACK: | |
415 | val = ro->want_ack; | |
416 | break; | |
417 | default: | |
418 | return -ENOPROTOOPT; | |
419 | } | |
420 | ||
421 | if (put_user(len, optlen)) | |
422 | return -EFAULT; | |
423 | if (copy_to_user(optval, &val, len)) | |
424 | return -EFAULT; | |
425 | return 0; | |
a9dfac33 DES |
426 | } |
427 | ||
428 | static int dgram_setsockopt(struct sock *sk, int level, int optname, | |
b7058842 | 429 | char __user *optval, unsigned int optlen) |
a9dfac33 | 430 | { |
99eb8558 DES |
431 | struct dgram_sock *ro = dgram_sk(sk); |
432 | int val; | |
433 | int err = 0; | |
434 | ||
435 | if (optlen < sizeof(int)) | |
436 | return -EINVAL; | |
437 | ||
438 | if (get_user(val, (int __user *)optval)) | |
439 | return -EFAULT; | |
440 | ||
441 | lock_sock(sk); | |
442 | ||
443 | switch (optname) { | |
444 | case WPAN_WANTACK: | |
445 | ro->want_ack = !!val; | |
446 | break; | |
447 | default: | |
448 | err = -ENOPROTOOPT; | |
449 | break; | |
450 | } | |
451 | ||
452 | release_sock(sk); | |
453 | return err; | |
a9dfac33 DES |
454 | } |
455 | ||
9ec76716 SL |
456 | struct proto ieee802154_dgram_prot = { |
457 | .name = "IEEE-802.15.4-MAC", | |
458 | .owner = THIS_MODULE, | |
459 | .obj_size = sizeof(struct dgram_sock), | |
460 | .init = dgram_init, | |
461 | .close = dgram_close, | |
462 | .bind = dgram_bind, | |
463 | .sendmsg = dgram_sendmsg, | |
464 | .recvmsg = dgram_recvmsg, | |
465 | .hash = dgram_hash, | |
466 | .unhash = dgram_unhash, | |
467 | .connect = dgram_connect, | |
468 | .disconnect = dgram_disconnect, | |
469 | .ioctl = dgram_ioctl, | |
a9dfac33 DES |
470 | .getsockopt = dgram_getsockopt, |
471 | .setsockopt = dgram_setsockopt, | |
9ec76716 SL |
472 | }; |
473 |