Merge tag 'locks-v3.16-2' of git://git.samba.org/jlayton/linux
[linux/fpc-iii.git] / net / ieee802154 / dgram.c
blob4f0ed8780194502465f0d5b60383bf6794bfadf0
1 /*
2 * IEEE 802.15.4 dgram socket interface
4 * Copyright 2007, 2008 Siemens AG
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.
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.
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.
19 * Written by:
20 * Sergey Lapin <slapin@ossfans.org>
21 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
24 #include <linux/capability.h>
25 #include <linux/net.h>
26 #include <linux/module.h>
27 #include <linux/if_arp.h>
28 #include <linux/list.h>
29 #include <linux/slab.h>
30 #include <net/sock.h>
31 #include <net/af_ieee802154.h>
32 #include <net/ieee802154.h>
33 #include <net/ieee802154_netdev.h>
35 #include <asm/ioctls.h>
37 #include "af802154.h"
39 static HLIST_HEAD(dgram_head);
40 static DEFINE_RWLOCK(dgram_lock);
42 struct dgram_sock {
43 struct sock sk;
45 struct ieee802154_addr src_addr;
46 struct ieee802154_addr dst_addr;
48 unsigned int bound:1;
49 unsigned int connected:1;
50 unsigned int want_ack:1;
51 unsigned int secen:1;
52 unsigned int secen_override:1;
53 unsigned int seclevel:3;
54 unsigned int seclevel_override:1;
57 static inline struct dgram_sock *dgram_sk(const struct sock *sk)
59 return container_of(sk, struct dgram_sock, sk);
62 static void dgram_hash(struct sock *sk)
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);
70 static void dgram_unhash(struct sock *sk)
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);
78 static int dgram_init(struct sock *sk)
80 struct dgram_sock *ro = dgram_sk(sk);
82 ro->want_ack = 1;
83 return 0;
86 static void dgram_close(struct sock *sk, long timeout)
88 sk_common_release(sk);
91 static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len)
93 struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
94 struct ieee802154_addr haddr;
95 struct dgram_sock *ro = dgram_sk(sk);
96 int err = -EINVAL;
97 struct net_device *dev;
99 lock_sock(sk);
101 ro->bound = 0;
103 if (len < sizeof(*addr))
104 goto out;
106 if (addr->family != AF_IEEE802154)
107 goto out;
109 ieee802154_addr_from_sa(&haddr, &addr->addr);
110 dev = ieee802154_get_dev(sock_net(sk), &haddr);
111 if (!dev) {
112 err = -ENODEV;
113 goto out;
116 if (dev->type != ARPHRD_IEEE802154) {
117 err = -ENODEV;
118 goto out_put;
121 ro->src_addr = haddr;
123 ro->bound = 1;
124 err = 0;
125 out_put:
126 dev_put(dev);
127 out:
128 release_sock(sk);
130 return err;
133 static int dgram_ioctl(struct sock *sk, int cmd, unsigned long arg)
135 switch (cmd) {
136 case SIOCOUTQ:
138 int amount = sk_wmem_alloc_get(sk);
140 return put_user(amount, (int __user *)arg);
143 case SIOCINQ:
145 struct sk_buff *skb;
146 unsigned long amount;
148 amount = 0;
149 spin_lock_bh(&sk->sk_receive_queue.lock);
150 skb = skb_peek(&sk->sk_receive_queue);
151 if (skb != NULL) {
153 * We will only return the amount
154 * of this packet since that is all
155 * that will be read.
157 amount = skb->len - ieee802154_hdr_length(skb);
159 spin_unlock_bh(&sk->sk_receive_queue.lock);
160 return put_user(amount, (int __user *)arg);
164 return -ENOIOCTLCMD;
167 /* FIXME: autobind */
168 static int dgram_connect(struct sock *sk, struct sockaddr *uaddr,
169 int len)
171 struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
172 struct dgram_sock *ro = dgram_sk(sk);
173 int err = 0;
175 if (len < sizeof(*addr))
176 return -EINVAL;
178 if (addr->family != AF_IEEE802154)
179 return -EINVAL;
181 lock_sock(sk);
183 if (!ro->bound) {
184 err = -ENETUNREACH;
185 goto out;
188 ieee802154_addr_from_sa(&ro->dst_addr, &addr->addr);
189 ro->connected = 1;
191 out:
192 release_sock(sk);
193 return err;
196 static int dgram_disconnect(struct sock *sk, int flags)
198 struct dgram_sock *ro = dgram_sk(sk);
200 lock_sock(sk);
201 ro->connected = 0;
202 release_sock(sk);
204 return 0;
207 static int dgram_sendmsg(struct kiocb *iocb, struct sock *sk,
208 struct msghdr *msg, size_t size)
210 struct net_device *dev;
211 unsigned int mtu;
212 struct sk_buff *skb;
213 struct ieee802154_mac_cb *cb;
214 struct dgram_sock *ro = dgram_sk(sk);
215 struct ieee802154_addr dst_addr;
216 int hlen, tlen;
217 int err;
219 if (msg->msg_flags & MSG_OOB) {
220 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
221 return -EOPNOTSUPP;
224 if (!ro->connected && !msg->msg_name)
225 return -EDESTADDRREQ;
226 else if (ro->connected && msg->msg_name)
227 return -EISCONN;
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);
234 if (!dev) {
235 pr_debug("no dev\n");
236 err = -ENXIO;
237 goto out;
239 mtu = dev->mtu;
240 pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
242 if (size > mtu) {
243 pr_debug("size = %Zu, mtu = %u\n", size, mtu);
244 err = -EMSGSIZE;
245 goto out_dev;
248 hlen = LL_RESERVED_SPACE(dev);
249 tlen = dev->needed_tailroom;
250 skb = sock_alloc_send_skb(sk, hlen + tlen + size,
251 msg->msg_flags & MSG_DONTWAIT,
252 &err);
253 if (!skb)
254 goto out_dev;
256 skb_reserve(skb, hlen);
258 skb_reset_network_header(skb);
260 cb = mac_cb_init(skb);
261 cb->type = IEEE802154_FC_TYPE_DATA;
262 cb->ackreq = ro->want_ack;
264 if (msg->msg_name) {
265 DECLARE_SOCKADDR(struct sockaddr_ieee802154*, daddr, msg->msg_name);
267 ieee802154_addr_from_sa(&dst_addr, &daddr->addr);
268 } else {
269 dst_addr = ro->dst_addr;
272 cb->secen = ro->secen;
273 cb->secen_override = ro->secen_override;
274 cb->seclevel = ro->seclevel;
275 cb->seclevel_override = ro->seclevel_override;
277 err = dev_hard_header(skb, dev, ETH_P_IEEE802154, &dst_addr,
278 ro->bound ? &ro->src_addr : NULL, size);
279 if (err < 0)
280 goto out_skb;
282 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
283 if (err < 0)
284 goto out_skb;
286 skb->dev = dev;
287 skb->sk = sk;
288 skb->protocol = htons(ETH_P_IEEE802154);
290 dev_put(dev);
292 err = dev_queue_xmit(skb);
293 if (err > 0)
294 err = net_xmit_errno(err);
296 return err ?: size;
298 out_skb:
299 kfree_skb(skb);
300 out_dev:
301 dev_put(dev);
302 out:
303 return err;
306 static int dgram_recvmsg(struct kiocb *iocb, struct sock *sk,
307 struct msghdr *msg, size_t len, int noblock, int flags,
308 int *addr_len)
310 size_t copied = 0;
311 int err = -EOPNOTSUPP;
312 struct sk_buff *skb;
313 DECLARE_SOCKADDR(struct sockaddr_ieee802154 *, saddr, msg->msg_name);
315 skb = skb_recv_datagram(sk, flags, noblock, &err);
316 if (!skb)
317 goto out;
319 copied = skb->len;
320 if (len < copied) {
321 msg->msg_flags |= MSG_TRUNC;
322 copied = len;
325 /* FIXME: skip headers if necessary ?! */
326 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
327 if (err)
328 goto done;
330 sock_recv_ts_and_drops(msg, sk, skb);
332 if (saddr) {
333 saddr->family = AF_IEEE802154;
334 ieee802154_addr_to_sa(&saddr->addr, &mac_cb(skb)->source);
335 *addr_len = sizeof(*saddr);
338 if (flags & MSG_TRUNC)
339 copied = skb->len;
340 done:
341 skb_free_datagram(sk, skb);
342 out:
343 if (err)
344 return err;
345 return copied;
348 static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb)
350 skb = skb_share_check(skb, GFP_ATOMIC);
351 if (!skb)
352 return NET_RX_DROP;
354 if (sock_queue_rcv_skb(sk, skb) < 0) {
355 kfree_skb(skb);
356 return NET_RX_DROP;
359 return NET_RX_SUCCESS;
362 static inline bool
363 ieee802154_match_sock(__le64 hw_addr, __le16 pan_id, __le16 short_addr,
364 struct dgram_sock *ro)
366 if (!ro->bound)
367 return true;
369 if (ro->src_addr.mode == IEEE802154_ADDR_LONG &&
370 hw_addr == ro->src_addr.extended_addr)
371 return true;
373 if (ro->src_addr.mode == IEEE802154_ADDR_SHORT &&
374 pan_id == ro->src_addr.pan_id &&
375 short_addr == ro->src_addr.short_addr)
376 return true;
378 return false;
381 int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb)
383 struct sock *sk, *prev = NULL;
384 int ret = NET_RX_SUCCESS;
385 __le16 pan_id, short_addr;
386 __le64 hw_addr;
388 /* Data frame processing */
389 BUG_ON(dev->type != ARPHRD_IEEE802154);
391 pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
392 short_addr = ieee802154_mlme_ops(dev)->get_short_addr(dev);
393 hw_addr = ieee802154_devaddr_from_raw(dev->dev_addr);
395 read_lock(&dgram_lock);
396 sk_for_each(sk, &dgram_head) {
397 if (ieee802154_match_sock(hw_addr, pan_id, short_addr,
398 dgram_sk(sk))) {
399 if (prev) {
400 struct sk_buff *clone;
401 clone = skb_clone(skb, GFP_ATOMIC);
402 if (clone)
403 dgram_rcv_skb(prev, clone);
406 prev = sk;
410 if (prev)
411 dgram_rcv_skb(prev, skb);
412 else {
413 kfree_skb(skb);
414 ret = NET_RX_DROP;
416 read_unlock(&dgram_lock);
418 return ret;
421 static int dgram_getsockopt(struct sock *sk, int level, int optname,
422 char __user *optval, int __user *optlen)
424 struct dgram_sock *ro = dgram_sk(sk);
426 int val, len;
428 if (level != SOL_IEEE802154)
429 return -EOPNOTSUPP;
431 if (get_user(len, optlen))
432 return -EFAULT;
434 len = min_t(unsigned int, len, sizeof(int));
436 switch (optname) {
437 case WPAN_WANTACK:
438 val = ro->want_ack;
439 break;
440 case WPAN_SECURITY:
441 if (!ro->secen_override)
442 val = WPAN_SECURITY_DEFAULT;
443 else if (ro->secen)
444 val = WPAN_SECURITY_ON;
445 else
446 val = WPAN_SECURITY_OFF;
447 break;
448 case WPAN_SECURITY_LEVEL:
449 if (!ro->seclevel_override)
450 val = WPAN_SECURITY_LEVEL_DEFAULT;
451 else
452 val = ro->seclevel;
453 break;
454 default:
455 return -ENOPROTOOPT;
458 if (put_user(len, optlen))
459 return -EFAULT;
460 if (copy_to_user(optval, &val, len))
461 return -EFAULT;
462 return 0;
465 static int dgram_setsockopt(struct sock *sk, int level, int optname,
466 char __user *optval, unsigned int optlen)
468 struct dgram_sock *ro = dgram_sk(sk);
469 struct net *net = sock_net(sk);
470 int val;
471 int err = 0;
473 if (optlen < sizeof(int))
474 return -EINVAL;
476 if (get_user(val, (int __user *)optval))
477 return -EFAULT;
479 lock_sock(sk);
481 switch (optname) {
482 case WPAN_WANTACK:
483 ro->want_ack = !!val;
484 break;
485 case WPAN_SECURITY:
486 if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
487 !ns_capable(net->user_ns, CAP_NET_RAW)) {
488 err = -EPERM;
489 break;
492 switch (val) {
493 case WPAN_SECURITY_DEFAULT:
494 ro->secen_override = 0;
495 break;
496 case WPAN_SECURITY_ON:
497 ro->secen_override = 1;
498 ro->secen = 1;
499 break;
500 case WPAN_SECURITY_OFF:
501 ro->secen_override = 1;
502 ro->secen = 0;
503 break;
504 default:
505 err = -EINVAL;
506 break;
508 break;
509 case WPAN_SECURITY_LEVEL:
510 if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
511 !ns_capable(net->user_ns, CAP_NET_RAW)) {
512 err = -EPERM;
513 break;
516 if (val < WPAN_SECURITY_LEVEL_DEFAULT ||
517 val > IEEE802154_SCF_SECLEVEL_ENC_MIC128) {
518 err = -EINVAL;
519 } else if (val == WPAN_SECURITY_LEVEL_DEFAULT) {
520 ro->seclevel_override = 0;
521 } else {
522 ro->seclevel_override = 1;
523 ro->seclevel = val;
525 break;
526 default:
527 err = -ENOPROTOOPT;
528 break;
531 release_sock(sk);
532 return err;
535 struct proto ieee802154_dgram_prot = {
536 .name = "IEEE-802.15.4-MAC",
537 .owner = THIS_MODULE,
538 .obj_size = sizeof(struct dgram_sock),
539 .init = dgram_init,
540 .close = dgram_close,
541 .bind = dgram_bind,
542 .sendmsg = dgram_sendmsg,
543 .recvmsg = dgram_recvmsg,
544 .hash = dgram_hash,
545 .unhash = dgram_unhash,
546 .connect = dgram_connect,
547 .disconnect = dgram_disconnect,
548 .ioctl = dgram_ioctl,
549 .getsockopt = dgram_getsockopt,
550 .setsockopt = dgram_setsockopt,