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 | ||
af9eed5b | 24 | #include <linux/capability.h> |
9ec76716 SL |
25 | #include <linux/net.h> |
26 | #include <linux/module.h> | |
27 | #include <linux/if_arp.h> | |
28 | #include <linux/list.h> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
9ec76716 | 30 | #include <net/sock.h> |
f0166e5e DES |
31 | #include <net/af_ieee802154.h> |
32 | #include <net/ieee802154.h> | |
33 | #include <net/ieee802154_netdev.h> | |
9ec76716 SL |
34 | |
35 | #include <asm/ioctls.h> | |
36 | ||
37 | #include "af802154.h" | |
38 | ||
39 | static HLIST_HEAD(dgram_head); | |
40 | static DEFINE_RWLOCK(dgram_lock); | |
41 | ||
42 | struct dgram_sock { | |
43 | struct sock sk; | |
44 | ||
e6278d92 PB |
45 | struct ieee802154_addr src_addr; |
46 | struct ieee802154_addr dst_addr; | |
74eda55d | 47 | |
95c96174 | 48 | unsigned int bound:1; |
1cc76e36 | 49 | unsigned int connected:1; |
95c96174 | 50 | unsigned int want_ack:1; |
af9eed5b PB |
51 | unsigned int secen:1; |
52 | unsigned int secen_override:1; | |
53 | unsigned int seclevel:3; | |
54 | unsigned int seclevel_override:1; | |
9ec76716 SL |
55 | }; |
56 | ||
57 | static inline struct dgram_sock *dgram_sk(const struct sock *sk) | |
58 | { | |
59 | return container_of(sk, struct dgram_sock, sk); | |
60 | } | |
61 | ||
9ec76716 SL |
62 | static void dgram_hash(struct sock *sk) |
63 | { | |
64 | write_lock_bh(&dgram_lock); | |
65 | sk_add_node(sk, &dgram_head); | |
66 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); | |
67 | write_unlock_bh(&dgram_lock); | |
68 | } | |
69 | ||
70 | static void dgram_unhash(struct sock *sk) | |
71 | { | |
72 | write_lock_bh(&dgram_lock); | |
73 | if (sk_del_node_init(sk)) | |
74 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); | |
75 | write_unlock_bh(&dgram_lock); | |
76 | } | |
77 | ||
78 | static int dgram_init(struct sock *sk) | |
79 | { | |
80 | struct dgram_sock *ro = dgram_sk(sk); | |
81 | ||
99eb8558 | 82 | ro->want_ack = 1; |
9ec76716 SL |
83 | return 0; |
84 | } | |
85 | ||
86 | static void dgram_close(struct sock *sk, long timeout) | |
87 | { | |
88 | sk_common_release(sk); | |
89 | } | |
90 | ||
91 | static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len) | |
92 | { | |
93 | struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr; | |
e6278d92 | 94 | struct ieee802154_addr haddr; |
9ec76716 | 95 | struct dgram_sock *ro = dgram_sk(sk); |
74eda55d | 96 | int err = -EINVAL; |
9ec76716 SL |
97 | struct net_device *dev; |
98 | ||
74eda55d DB |
99 | lock_sock(sk); |
100 | ||
9ec76716 SL |
101 | ro->bound = 0; |
102 | ||
103 | if (len < sizeof(*addr)) | |
74eda55d | 104 | goto out; |
9ec76716 SL |
105 | |
106 | if (addr->family != AF_IEEE802154) | |
74eda55d | 107 | goto out; |
9ec76716 | 108 | |
e6278d92 PB |
109 | ieee802154_addr_from_sa(&haddr, &addr->addr); |
110 | dev = ieee802154_get_dev(sock_net(sk), &haddr); | |
9ec76716 SL |
111 | if (!dev) { |
112 | err = -ENODEV; | |
113 | goto out; | |
114 | } | |
115 | ||
116 | if (dev->type != ARPHRD_IEEE802154) { | |
117 | err = -ENODEV; | |
118 | goto out_put; | |
119 | } | |
120 | ||
e6278d92 | 121 | ro->src_addr = haddr; |
9ec76716 SL |
122 | |
123 | ro->bound = 1; | |
74eda55d | 124 | err = 0; |
9ec76716 SL |
125 | out_put: |
126 | dev_put(dev); | |
127 | out: | |
128 | release_sock(sk); | |
129 | ||
130 | return err; | |
131 | } | |
132 | ||
133 | static int dgram_ioctl(struct sock *sk, int cmd, unsigned long arg) | |
134 | { | |
135 | switch (cmd) { | |
136 | case SIOCOUTQ: | |
137 | { | |
31e6d363 ED |
138 | int amount = sk_wmem_alloc_get(sk); |
139 | ||
9ec76716 SL |
140 | return put_user(amount, (int __user *)arg); |
141 | } | |
142 | ||
143 | case SIOCINQ: | |
144 | { | |
145 | struct sk_buff *skb; | |
146 | unsigned long amount; | |
147 | ||
148 | amount = 0; | |
149 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
150 | skb = skb_peek(&sk->sk_receive_queue); | |
151 | if (skb != NULL) { | |
4710d806 | 152 | /* We will only return the amount |
9ec76716 SL |
153 | * of this packet since that is all |
154 | * that will be read. | |
155 | */ | |
e6278d92 | 156 | amount = skb->len - ieee802154_hdr_length(skb); |
9ec76716 SL |
157 | } |
158 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
159 | return put_user(amount, (int __user *)arg); | |
160 | } | |
161 | ||
162 | } | |
4710d806 | 163 | |
9ec76716 SL |
164 | return -ENOIOCTLCMD; |
165 | } | |
166 | ||
167 | /* FIXME: autobind */ | |
168 | static int dgram_connect(struct sock *sk, struct sockaddr *uaddr, | |
4710d806 | 169 | int len) |
9ec76716 SL |
170 | { |
171 | struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr; | |
172 | struct dgram_sock *ro = dgram_sk(sk); | |
173 | int err = 0; | |
174 | ||
175 | if (len < sizeof(*addr)) | |
176 | return -EINVAL; | |
177 | ||
178 | if (addr->family != AF_IEEE802154) | |
179 | return -EINVAL; | |
180 | ||
181 | lock_sock(sk); | |
182 | ||
183 | if (!ro->bound) { | |
184 | err = -ENETUNREACH; | |
185 | goto out; | |
186 | } | |
187 | ||
e6278d92 | 188 | ieee802154_addr_from_sa(&ro->dst_addr, &addr->addr); |
1cc76e36 | 189 | ro->connected = 1; |
9ec76716 SL |
190 | |
191 | out: | |
192 | release_sock(sk); | |
193 | return err; | |
194 | } | |
195 | ||
196 | static int dgram_disconnect(struct sock *sk, int flags) | |
197 | { | |
198 | struct dgram_sock *ro = dgram_sk(sk); | |
199 | ||
200 | lock_sock(sk); | |
1cc76e36 | 201 | ro->connected = 0; |
9ec76716 SL |
202 | release_sock(sk); |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
207 | static int dgram_sendmsg(struct kiocb *iocb, struct sock *sk, | |
4710d806 | 208 | struct msghdr *msg, size_t size) |
9ec76716 SL |
209 | { |
210 | struct net_device *dev; | |
95c96174 | 211 | unsigned int mtu; |
9ec76716 | 212 | struct sk_buff *skb; |
32edc40a | 213 | struct ieee802154_mac_cb *cb; |
9ec76716 | 214 | struct dgram_sock *ro = dgram_sk(sk); |
1cc76e36 | 215 | struct ieee802154_addr dst_addr; |
ae641949 | 216 | int hlen, tlen; |
9ec76716 SL |
217 | int err; |
218 | ||
219 | if (msg->msg_flags & MSG_OOB) { | |
220 | pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags); | |
221 | return -EOPNOTSUPP; | |
222 | } | |
223 | ||
1cc76e36 PB |
224 | if (!ro->connected && !msg->msg_name) |
225 | return -EDESTADDRREQ; | |
226 | else if (ro->connected && msg->msg_name) | |
227 | return -EISCONN; | |
228 | ||
9ec76716 SL |
229 | if (!ro->bound) |
230 | dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154); | |
231 | else | |
232 | dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr); | |
233 | ||
234 | if (!dev) { | |
235 | pr_debug("no dev\n"); | |
236 | err = -ENXIO; | |
237 | goto out; | |
238 | } | |
239 | mtu = dev->mtu; | |
240 | pr_debug("name = %s, mtu = %u\n", dev->name, mtu); | |
241 | ||
3da947b2 SL |
242 | if (size > mtu) { |
243 | pr_debug("size = %Zu, mtu = %u\n", size, mtu); | |
d1d7358e | 244 | err = -EMSGSIZE; |
3da947b2 SL |
245 | goto out_dev; |
246 | } | |
247 | ||
ae641949 HX |
248 | hlen = LL_RESERVED_SPACE(dev); |
249 | tlen = dev->needed_tailroom; | |
250 | skb = sock_alloc_send_skb(sk, hlen + tlen + size, | |
4710d806 VB |
251 | msg->msg_flags & MSG_DONTWAIT, |
252 | &err); | |
9ec76716 SL |
253 | if (!skb) |
254 | goto out_dev; | |
255 | ||
ae641949 | 256 | skb_reserve(skb, hlen); |
9ec76716 SL |
257 | |
258 | skb_reset_network_header(skb); | |
259 | ||
32edc40a PB |
260 | cb = mac_cb_init(skb); |
261 | cb->type = IEEE802154_FC_TYPE_DATA; | |
262 | cb->ackreq = ro->want_ack; | |
99eb8558 | 263 | |
1cc76e36 | 264 | if (msg->msg_name) { |
4710d806 VB |
265 | DECLARE_SOCKADDR(struct sockaddr_ieee802154*, |
266 | daddr, msg->msg_name); | |
1cc76e36 PB |
267 | |
268 | ieee802154_addr_from_sa(&dst_addr, &daddr->addr); | |
269 | } else { | |
270 | dst_addr = ro->dst_addr; | |
271 | } | |
272 | ||
af9eed5b PB |
273 | cb->secen = ro->secen; |
274 | cb->secen_override = ro->secen_override; | |
275 | cb->seclevel = ro->seclevel; | |
276 | cb->seclevel_override = ro->seclevel_override; | |
277 | ||
1cc76e36 PB |
278 | err = dev_hard_header(skb, dev, ETH_P_IEEE802154, &dst_addr, |
279 | ro->bound ? &ro->src_addr : NULL, size); | |
9ec76716 SL |
280 | if (err < 0) |
281 | goto out_skb; | |
282 | ||
9ec76716 SL |
283 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); |
284 | if (err < 0) | |
285 | goto out_skb; | |
286 | ||
9ec76716 SL |
287 | skb->dev = dev; |
288 | skb->sk = sk; | |
289 | skb->protocol = htons(ETH_P_IEEE802154); | |
290 | ||
291 | dev_put(dev); | |
292 | ||
293 | err = dev_queue_xmit(skb); | |
294 | if (err > 0) | |
295 | err = net_xmit_errno(err); | |
296 | ||
297 | return err ?: size; | |
298 | ||
299 | out_skb: | |
300 | kfree_skb(skb); | |
301 | out_dev: | |
302 | dev_put(dev); | |
303 | out: | |
304 | return err; | |
305 | } | |
306 | ||
307 | static int dgram_recvmsg(struct kiocb *iocb, struct sock *sk, | |
4710d806 VB |
308 | struct msghdr *msg, size_t len, int noblock, |
309 | int flags, int *addr_len) | |
9ec76716 SL |
310 | { |
311 | size_t copied = 0; | |
312 | int err = -EOPNOTSUPP; | |
313 | struct sk_buff *skb; | |
342dfc30 | 314 | DECLARE_SOCKADDR(struct sockaddr_ieee802154 *, saddr, msg->msg_name); |
9ec76716 SL |
315 | |
316 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
317 | if (!skb) | |
318 | goto out; | |
319 | ||
320 | copied = skb->len; | |
321 | if (len < copied) { | |
322 | msg->msg_flags |= MSG_TRUNC; | |
323 | copied = len; | |
324 | } | |
325 | ||
326 | /* FIXME: skip headers if necessary ?! */ | |
327 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
328 | if (err) | |
329 | goto done; | |
330 | ||
3b885787 | 331 | sock_recv_ts_and_drops(msg, sk, skb); |
9ec76716 | 332 | |
6364e6ee SR |
333 | if (saddr) { |
334 | saddr->family = AF_IEEE802154; | |
ae531b94 | 335 | ieee802154_addr_to_sa(&saddr->addr, &mac_cb(skb)->source); |
6364e6ee | 336 | *addr_len = sizeof(*saddr); |
bceaa902 | 337 | } |
6364e6ee | 338 | |
9ec76716 SL |
339 | if (flags & MSG_TRUNC) |
340 | copied = skb->len; | |
341 | done: | |
342 | skb_free_datagram(sk, skb); | |
343 | out: | |
344 | if (err) | |
345 | return err; | |
346 | return copied; | |
347 | } | |
348 | ||
349 | static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
350 | { | |
8cfad496 PB |
351 | skb = skb_share_check(skb, GFP_ATOMIC); |
352 | if (!skb) | |
353 | return NET_RX_DROP; | |
354 | ||
9ec76716 | 355 | if (sock_queue_rcv_skb(sk, skb) < 0) { |
9ec76716 SL |
356 | kfree_skb(skb); |
357 | return NET_RX_DROP; | |
358 | } | |
359 | ||
360 | return NET_RX_SUCCESS; | |
361 | } | |
362 | ||
e6278d92 PB |
363 | static inline bool |
364 | ieee802154_match_sock(__le64 hw_addr, __le16 pan_id, __le16 short_addr, | |
365 | struct dgram_sock *ro) | |
9ec76716 SL |
366 | { |
367 | if (!ro->bound) | |
e6278d92 | 368 | return true; |
9ec76716 | 369 | |
e6278d92 PB |
370 | if (ro->src_addr.mode == IEEE802154_ADDR_LONG && |
371 | hw_addr == ro->src_addr.extended_addr) | |
372 | return true; | |
9ec76716 | 373 | |
e6278d92 PB |
374 | if (ro->src_addr.mode == IEEE802154_ADDR_SHORT && |
375 | pan_id == ro->src_addr.pan_id && | |
376 | short_addr == ro->src_addr.short_addr) | |
377 | return true; | |
9ec76716 | 378 | |
e6278d92 | 379 | return false; |
9ec76716 SL |
380 | } |
381 | ||
382 | int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb) | |
383 | { | |
384 | struct sock *sk, *prev = NULL; | |
9ec76716 | 385 | int ret = NET_RX_SUCCESS; |
e6278d92 PB |
386 | __le16 pan_id, short_addr; |
387 | __le64 hw_addr; | |
9ec76716 SL |
388 | |
389 | /* Data frame processing */ | |
390 | BUG_ON(dev->type != ARPHRD_IEEE802154); | |
391 | ||
e6278d92 PB |
392 | pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev); |
393 | short_addr = ieee802154_mlme_ops(dev)->get_short_addr(dev); | |
394 | hw_addr = ieee802154_devaddr_from_raw(dev->dev_addr); | |
9ec76716 SL |
395 | |
396 | read_lock(&dgram_lock); | |
b67bfe0d | 397 | sk_for_each(sk, &dgram_head) { |
e6278d92 PB |
398 | if (ieee802154_match_sock(hw_addr, pan_id, short_addr, |
399 | dgram_sk(sk))) { | |
9ec76716 SL |
400 | if (prev) { |
401 | struct sk_buff *clone; | |
4710d806 | 402 | |
9ec76716 SL |
403 | clone = skb_clone(skb, GFP_ATOMIC); |
404 | if (clone) | |
405 | dgram_rcv_skb(prev, clone); | |
406 | } | |
407 | ||
408 | prev = sk; | |
409 | } | |
410 | } | |
411 | ||
4710d806 | 412 | if (prev) { |
9ec76716 | 413 | dgram_rcv_skb(prev, skb); |
4710d806 | 414 | } else { |
9ec76716 SL |
415 | kfree_skb(skb); |
416 | ret = NET_RX_DROP; | |
417 | } | |
418 | read_unlock(&dgram_lock); | |
419 | ||
420 | return ret; | |
421 | } | |
422 | ||
a9dfac33 | 423 | static int dgram_getsockopt(struct sock *sk, int level, int optname, |
4710d806 | 424 | char __user *optval, int __user *optlen) |
a9dfac33 | 425 | { |
99eb8558 DB |
426 | struct dgram_sock *ro = dgram_sk(sk); |
427 | ||
428 | int val, len; | |
429 | ||
430 | if (level != SOL_IEEE802154) | |
431 | return -EOPNOTSUPP; | |
432 | ||
433 | if (get_user(len, optlen)) | |
434 | return -EFAULT; | |
435 | ||
436 | len = min_t(unsigned int, len, sizeof(int)); | |
437 | ||
438 | switch (optname) { | |
439 | case WPAN_WANTACK: | |
440 | val = ro->want_ack; | |
441 | break; | |
af9eed5b PB |
442 | case WPAN_SECURITY: |
443 | if (!ro->secen_override) | |
444 | val = WPAN_SECURITY_DEFAULT; | |
445 | else if (ro->secen) | |
446 | val = WPAN_SECURITY_ON; | |
447 | else | |
448 | val = WPAN_SECURITY_OFF; | |
449 | break; | |
450 | case WPAN_SECURITY_LEVEL: | |
451 | if (!ro->seclevel_override) | |
452 | val = WPAN_SECURITY_LEVEL_DEFAULT; | |
453 | else | |
454 | val = ro->seclevel; | |
455 | break; | |
99eb8558 DB |
456 | default: |
457 | return -ENOPROTOOPT; | |
458 | } | |
459 | ||
460 | if (put_user(len, optlen)) | |
461 | return -EFAULT; | |
462 | if (copy_to_user(optval, &val, len)) | |
463 | return -EFAULT; | |
464 | return 0; | |
a9dfac33 DES |
465 | } |
466 | ||
467 | static int dgram_setsockopt(struct sock *sk, int level, int optname, | |
4710d806 | 468 | char __user *optval, unsigned int optlen) |
a9dfac33 | 469 | { |
99eb8558 | 470 | struct dgram_sock *ro = dgram_sk(sk); |
af9eed5b | 471 | struct net *net = sock_net(sk); |
99eb8558 DB |
472 | int val; |
473 | int err = 0; | |
474 | ||
475 | if (optlen < sizeof(int)) | |
476 | return -EINVAL; | |
477 | ||
478 | if (get_user(val, (int __user *)optval)) | |
479 | return -EFAULT; | |
480 | ||
481 | lock_sock(sk); | |
482 | ||
483 | switch (optname) { | |
484 | case WPAN_WANTACK: | |
485 | ro->want_ack = !!val; | |
486 | break; | |
af9eed5b PB |
487 | case WPAN_SECURITY: |
488 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN) && | |
489 | !ns_capable(net->user_ns, CAP_NET_RAW)) { | |
490 | err = -EPERM; | |
491 | break; | |
492 | } | |
493 | ||
494 | switch (val) { | |
495 | case WPAN_SECURITY_DEFAULT: | |
496 | ro->secen_override = 0; | |
497 | break; | |
498 | case WPAN_SECURITY_ON: | |
499 | ro->secen_override = 1; | |
500 | ro->secen = 1; | |
501 | break; | |
502 | case WPAN_SECURITY_OFF: | |
503 | ro->secen_override = 1; | |
504 | ro->secen = 0; | |
505 | break; | |
506 | default: | |
507 | err = -EINVAL; | |
508 | break; | |
509 | } | |
510 | break; | |
511 | case WPAN_SECURITY_LEVEL: | |
512 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN) && | |
513 | !ns_capable(net->user_ns, CAP_NET_RAW)) { | |
514 | err = -EPERM; | |
515 | break; | |
516 | } | |
517 | ||
518 | if (val < WPAN_SECURITY_LEVEL_DEFAULT || | |
519 | val > IEEE802154_SCF_SECLEVEL_ENC_MIC128) { | |
520 | err = -EINVAL; | |
521 | } else if (val == WPAN_SECURITY_LEVEL_DEFAULT) { | |
522 | ro->seclevel_override = 0; | |
523 | } else { | |
524 | ro->seclevel_override = 1; | |
525 | ro->seclevel = val; | |
526 | } | |
527 | break; | |
99eb8558 DB |
528 | default: |
529 | err = -ENOPROTOOPT; | |
530 | break; | |
531 | } | |
532 | ||
533 | release_sock(sk); | |
534 | return err; | |
a9dfac33 DES |
535 | } |
536 | ||
9ec76716 SL |
537 | struct proto ieee802154_dgram_prot = { |
538 | .name = "IEEE-802.15.4-MAC", | |
539 | .owner = THIS_MODULE, | |
540 | .obj_size = sizeof(struct dgram_sock), | |
541 | .init = dgram_init, | |
542 | .close = dgram_close, | |
543 | .bind = dgram_bind, | |
544 | .sendmsg = dgram_sendmsg, | |
545 | .recvmsg = dgram_recvmsg, | |
546 | .hash = dgram_hash, | |
547 | .unhash = dgram_unhash, | |
548 | .connect = dgram_connect, | |
549 | .disconnect = dgram_disconnect, | |
550 | .ioctl = dgram_ioctl, | |
a9dfac33 DES |
551 | .getsockopt = dgram_getsockopt, |
552 | .setsockopt = dgram_setsockopt, | |
9ec76716 SL |
553 | }; |
554 |