Commit | Line | Data |
---|---|---|
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 | ||
e6278d92 PB |
44 | struct ieee802154_addr src_addr; |
45 | struct ieee802154_addr dst_addr; | |
74eda55d | 46 | |
95c96174 | 47 | unsigned int bound:1; |
1cc76e36 | 48 | unsigned int connected:1; |
95c96174 | 49 | unsigned int want_ack:1; |
9ec76716 SL |
50 | }; |
51 | ||
52 | static inline struct dgram_sock *dgram_sk(const struct sock *sk) | |
53 | { | |
54 | return container_of(sk, struct dgram_sock, sk); | |
55 | } | |
56 | ||
9ec76716 SL |
57 | static void dgram_hash(struct sock *sk) |
58 | { | |
59 | write_lock_bh(&dgram_lock); | |
60 | sk_add_node(sk, &dgram_head); | |
61 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); | |
62 | write_unlock_bh(&dgram_lock); | |
63 | } | |
64 | ||
65 | static void dgram_unhash(struct sock *sk) | |
66 | { | |
67 | write_lock_bh(&dgram_lock); | |
68 | if (sk_del_node_init(sk)) | |
69 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); | |
70 | write_unlock_bh(&dgram_lock); | |
71 | } | |
72 | ||
73 | static int dgram_init(struct sock *sk) | |
74 | { | |
75 | struct dgram_sock *ro = dgram_sk(sk); | |
76 | ||
99eb8558 | 77 | ro->want_ack = 1; |
9ec76716 SL |
78 | return 0; |
79 | } | |
80 | ||
81 | static void dgram_close(struct sock *sk, long timeout) | |
82 | { | |
83 | sk_common_release(sk); | |
84 | } | |
85 | ||
86 | static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len) | |
87 | { | |
88 | struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr; | |
e6278d92 | 89 | struct ieee802154_addr haddr; |
9ec76716 | 90 | struct dgram_sock *ro = dgram_sk(sk); |
74eda55d | 91 | int err = -EINVAL; |
9ec76716 SL |
92 | struct net_device *dev; |
93 | ||
74eda55d DB |
94 | lock_sock(sk); |
95 | ||
9ec76716 SL |
96 | ro->bound = 0; |
97 | ||
98 | if (len < sizeof(*addr)) | |
74eda55d | 99 | goto out; |
9ec76716 SL |
100 | |
101 | if (addr->family != AF_IEEE802154) | |
74eda55d | 102 | goto out; |
9ec76716 | 103 | |
e6278d92 PB |
104 | ieee802154_addr_from_sa(&haddr, &addr->addr); |
105 | dev = ieee802154_get_dev(sock_net(sk), &haddr); | |
9ec76716 SL |
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 | ||
e6278d92 | 116 | ro->src_addr = haddr; |
9ec76716 SL |
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 | */ | |
e6278d92 | 152 | amount = skb->len - ieee802154_hdr_length(skb); |
9ec76716 SL |
153 | } |
154 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
155 | return put_user(amount, (int __user *)arg); | |
156 | } | |
157 | ||
158 | } | |
159 | return -ENOIOCTLCMD; | |
160 | } | |
161 | ||
162 | /* FIXME: autobind */ | |
163 | static int dgram_connect(struct sock *sk, struct sockaddr *uaddr, | |
164 | int len) | |
165 | { | |
166 | struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr; | |
167 | struct dgram_sock *ro = dgram_sk(sk); | |
168 | int err = 0; | |
169 | ||
170 | if (len < sizeof(*addr)) | |
171 | return -EINVAL; | |
172 | ||
173 | if (addr->family != AF_IEEE802154) | |
174 | return -EINVAL; | |
175 | ||
176 | lock_sock(sk); | |
177 | ||
178 | if (!ro->bound) { | |
179 | err = -ENETUNREACH; | |
180 | goto out; | |
181 | } | |
182 | ||
e6278d92 | 183 | ieee802154_addr_from_sa(&ro->dst_addr, &addr->addr); |
1cc76e36 | 184 | ro->connected = 1; |
9ec76716 SL |
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); | |
1cc76e36 | 196 | ro->connected = 0; |
9ec76716 SL |
197 | release_sock(sk); |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
202 | static int dgram_sendmsg(struct kiocb *iocb, struct sock *sk, | |
203 | struct msghdr *msg, size_t size) | |
204 | { | |
205 | struct net_device *dev; | |
95c96174 | 206 | unsigned int mtu; |
9ec76716 | 207 | struct sk_buff *skb; |
32edc40a | 208 | struct ieee802154_mac_cb *cb; |
9ec76716 | 209 | struct dgram_sock *ro = dgram_sk(sk); |
1cc76e36 | 210 | struct ieee802154_addr dst_addr; |
ae641949 | 211 | int hlen, tlen; |
9ec76716 SL |
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 | ||
1cc76e36 PB |
219 | if (!ro->connected && !msg->msg_name) |
220 | return -EDESTADDRREQ; | |
221 | else if (ro->connected && msg->msg_name) | |
222 | return -EISCONN; | |
223 | ||
9ec76716 SL |
224 | if (!ro->bound) |
225 | dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154); | |
226 | else | |
227 | dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr); | |
228 | ||
229 | if (!dev) { | |
230 | pr_debug("no dev\n"); | |
231 | err = -ENXIO; | |
232 | goto out; | |
233 | } | |
234 | mtu = dev->mtu; | |
235 | pr_debug("name = %s, mtu = %u\n", dev->name, mtu); | |
236 | ||
3da947b2 SL |
237 | if (size > mtu) { |
238 | pr_debug("size = %Zu, mtu = %u\n", size, mtu); | |
d1d7358e | 239 | err = -EMSGSIZE; |
3da947b2 SL |
240 | goto out_dev; |
241 | } | |
242 | ||
ae641949 HX |
243 | hlen = LL_RESERVED_SPACE(dev); |
244 | tlen = dev->needed_tailroom; | |
245 | skb = sock_alloc_send_skb(sk, hlen + tlen + size, | |
9ec76716 SL |
246 | msg->msg_flags & MSG_DONTWAIT, |
247 | &err); | |
248 | if (!skb) | |
249 | goto out_dev; | |
250 | ||
ae641949 | 251 | skb_reserve(skb, hlen); |
9ec76716 SL |
252 | |
253 | skb_reset_network_header(skb); | |
254 | ||
32edc40a PB |
255 | cb = mac_cb_init(skb); |
256 | cb->type = IEEE802154_FC_TYPE_DATA; | |
257 | cb->ackreq = ro->want_ack; | |
99eb8558 | 258 | |
1cc76e36 PB |
259 | if (msg->msg_name) { |
260 | DECLARE_SOCKADDR(struct sockaddr_ieee802154*, daddr, msg->msg_name); | |
261 | ||
262 | ieee802154_addr_from_sa(&dst_addr, &daddr->addr); | |
263 | } else { | |
264 | dst_addr = ro->dst_addr; | |
265 | } | |
266 | ||
267 | err = dev_hard_header(skb, dev, ETH_P_IEEE802154, &dst_addr, | |
268 | ro->bound ? &ro->src_addr : NULL, size); | |
9ec76716 SL |
269 | if (err < 0) |
270 | goto out_skb; | |
271 | ||
9ec76716 SL |
272 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); |
273 | if (err < 0) | |
274 | goto out_skb; | |
275 | ||
9ec76716 SL |
276 | skb->dev = dev; |
277 | skb->sk = sk; | |
278 | skb->protocol = htons(ETH_P_IEEE802154); | |
279 | ||
280 | dev_put(dev); | |
281 | ||
282 | err = dev_queue_xmit(skb); | |
283 | if (err > 0) | |
284 | err = net_xmit_errno(err); | |
285 | ||
286 | return err ?: size; | |
287 | ||
288 | out_skb: | |
289 | kfree_skb(skb); | |
290 | out_dev: | |
291 | dev_put(dev); | |
292 | out: | |
293 | return err; | |
294 | } | |
295 | ||
296 | static int dgram_recvmsg(struct kiocb *iocb, struct sock *sk, | |
297 | struct msghdr *msg, size_t len, int noblock, int flags, | |
298 | int *addr_len) | |
299 | { | |
300 | size_t copied = 0; | |
301 | int err = -EOPNOTSUPP; | |
302 | struct sk_buff *skb; | |
342dfc30 | 303 | DECLARE_SOCKADDR(struct sockaddr_ieee802154 *, saddr, msg->msg_name); |
9ec76716 SL |
304 | |
305 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
306 | if (!skb) | |
307 | goto out; | |
308 | ||
309 | copied = skb->len; | |
310 | if (len < copied) { | |
311 | msg->msg_flags |= MSG_TRUNC; | |
312 | copied = len; | |
313 | } | |
314 | ||
315 | /* FIXME: skip headers if necessary ?! */ | |
316 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
317 | if (err) | |
318 | goto done; | |
319 | ||
3b885787 | 320 | sock_recv_ts_and_drops(msg, sk, skb); |
9ec76716 | 321 | |
6364e6ee SR |
322 | if (saddr) { |
323 | saddr->family = AF_IEEE802154; | |
ae531b94 | 324 | ieee802154_addr_to_sa(&saddr->addr, &mac_cb(skb)->source); |
6364e6ee | 325 | *addr_len = sizeof(*saddr); |
bceaa902 | 326 | } |
6364e6ee | 327 | |
9ec76716 SL |
328 | if (flags & MSG_TRUNC) |
329 | copied = skb->len; | |
330 | done: | |
331 | skb_free_datagram(sk, skb); | |
332 | out: | |
333 | if (err) | |
334 | return err; | |
335 | return copied; | |
336 | } | |
337 | ||
338 | static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
339 | { | |
8cfad496 PB |
340 | skb = skb_share_check(skb, GFP_ATOMIC); |
341 | if (!skb) | |
342 | return NET_RX_DROP; | |
343 | ||
9ec76716 | 344 | if (sock_queue_rcv_skb(sk, skb) < 0) { |
9ec76716 SL |
345 | kfree_skb(skb); |
346 | return NET_RX_DROP; | |
347 | } | |
348 | ||
349 | return NET_RX_SUCCESS; | |
350 | } | |
351 | ||
e6278d92 PB |
352 | static inline bool |
353 | ieee802154_match_sock(__le64 hw_addr, __le16 pan_id, __le16 short_addr, | |
354 | struct dgram_sock *ro) | |
9ec76716 SL |
355 | { |
356 | if (!ro->bound) | |
e6278d92 | 357 | return true; |
9ec76716 | 358 | |
e6278d92 PB |
359 | if (ro->src_addr.mode == IEEE802154_ADDR_LONG && |
360 | hw_addr == ro->src_addr.extended_addr) | |
361 | return true; | |
9ec76716 | 362 | |
e6278d92 PB |
363 | if (ro->src_addr.mode == IEEE802154_ADDR_SHORT && |
364 | pan_id == ro->src_addr.pan_id && | |
365 | short_addr == ro->src_addr.short_addr) | |
366 | return true; | |
9ec76716 | 367 | |
e6278d92 | 368 | return false; |
9ec76716 SL |
369 | } |
370 | ||
371 | int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb) | |
372 | { | |
373 | struct sock *sk, *prev = NULL; | |
9ec76716 | 374 | int ret = NET_RX_SUCCESS; |
e6278d92 PB |
375 | __le16 pan_id, short_addr; |
376 | __le64 hw_addr; | |
9ec76716 SL |
377 | |
378 | /* Data frame processing */ | |
379 | BUG_ON(dev->type != ARPHRD_IEEE802154); | |
380 | ||
e6278d92 PB |
381 | pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev); |
382 | short_addr = ieee802154_mlme_ops(dev)->get_short_addr(dev); | |
383 | hw_addr = ieee802154_devaddr_from_raw(dev->dev_addr); | |
9ec76716 SL |
384 | |
385 | read_lock(&dgram_lock); | |
b67bfe0d | 386 | sk_for_each(sk, &dgram_head) { |
e6278d92 PB |
387 | if (ieee802154_match_sock(hw_addr, pan_id, short_addr, |
388 | dgram_sk(sk))) { | |
9ec76716 SL |
389 | if (prev) { |
390 | struct sk_buff *clone; | |
391 | clone = skb_clone(skb, GFP_ATOMIC); | |
392 | if (clone) | |
393 | dgram_rcv_skb(prev, clone); | |
394 | } | |
395 | ||
396 | prev = sk; | |
397 | } | |
398 | } | |
399 | ||
400 | if (prev) | |
401 | dgram_rcv_skb(prev, skb); | |
402 | else { | |
403 | kfree_skb(skb); | |
404 | ret = NET_RX_DROP; | |
405 | } | |
406 | read_unlock(&dgram_lock); | |
407 | ||
408 | return ret; | |
409 | } | |
410 | ||
a9dfac33 DES |
411 | static int dgram_getsockopt(struct sock *sk, int level, int optname, |
412 | char __user *optval, int __user *optlen) | |
413 | { | |
99eb8558 DB |
414 | struct dgram_sock *ro = dgram_sk(sk); |
415 | ||
416 | int val, len; | |
417 | ||
418 | if (level != SOL_IEEE802154) | |
419 | return -EOPNOTSUPP; | |
420 | ||
421 | if (get_user(len, optlen)) | |
422 | return -EFAULT; | |
423 | ||
424 | len = min_t(unsigned int, len, sizeof(int)); | |
425 | ||
426 | switch (optname) { | |
427 | case WPAN_WANTACK: | |
428 | val = ro->want_ack; | |
429 | break; | |
430 | default: | |
431 | return -ENOPROTOOPT; | |
432 | } | |
433 | ||
434 | if (put_user(len, optlen)) | |
435 | return -EFAULT; | |
436 | if (copy_to_user(optval, &val, len)) | |
437 | return -EFAULT; | |
438 | return 0; | |
a9dfac33 DES |
439 | } |
440 | ||
441 | static int dgram_setsockopt(struct sock *sk, int level, int optname, | |
b7058842 | 442 | char __user *optval, unsigned int optlen) |
a9dfac33 | 443 | { |
99eb8558 DB |
444 | struct dgram_sock *ro = dgram_sk(sk); |
445 | int val; | |
446 | int err = 0; | |
447 | ||
448 | if (optlen < sizeof(int)) | |
449 | return -EINVAL; | |
450 | ||
451 | if (get_user(val, (int __user *)optval)) | |
452 | return -EFAULT; | |
453 | ||
454 | lock_sock(sk); | |
455 | ||
456 | switch (optname) { | |
457 | case WPAN_WANTACK: | |
458 | ro->want_ack = !!val; | |
459 | break; | |
460 | default: | |
461 | err = -ENOPROTOOPT; | |
462 | break; | |
463 | } | |
464 | ||
465 | release_sock(sk); | |
466 | return err; | |
a9dfac33 DES |
467 | } |
468 | ||
9ec76716 SL |
469 | struct proto ieee802154_dgram_prot = { |
470 | .name = "IEEE-802.15.4-MAC", | |
471 | .owner = THIS_MODULE, | |
472 | .obj_size = sizeof(struct dgram_sock), | |
473 | .init = dgram_init, | |
474 | .close = dgram_close, | |
475 | .bind = dgram_bind, | |
476 | .sendmsg = dgram_sendmsg, | |
477 | .recvmsg = dgram_recvmsg, | |
478 | .hash = dgram_hash, | |
479 | .unhash = dgram_unhash, | |
480 | .connect = dgram_connect, | |
481 | .disconnect = dgram_disconnect, | |
482 | .ioctl = dgram_ioctl, | |
a9dfac33 DES |
483 | .getsockopt = dgram_getsockopt, |
484 | .setsockopt = dgram_setsockopt, | |
9ec76716 SL |
485 | }; |
486 |