xref: /linux/net/ieee802154/socket.c (revision 79790b6818e96c58fe2bffee1b418c16e64e7b80)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * IEEE802154.4 socket interface
4  *
5  * Copyright 2007, 2008 Siemens AG
6  *
7  * Written by:
8  * Sergey Lapin <slapin@ossfans.org>
9  * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
10  */
11 
12 #include <linux/net.h>
13 #include <linux/capability.h>
14 #include <linux/module.h>
15 #include <linux/if_arp.h>
16 #include <linux/if.h>
17 #include <linux/termios.h>	/* For TIOCOUTQ/INQ */
18 #include <linux/list.h>
19 #include <linux/slab.h>
20 #include <linux/socket.h>
21 #include <net/datalink.h>
22 #include <net/psnap.h>
23 #include <net/sock.h>
24 #include <net/tcp_states.h>
25 #include <net/route.h>
26 
27 #include <net/af_ieee802154.h>
28 #include <net/ieee802154_netdev.h>
29 
30 /* Utility function for families */
31 static struct net_device*
ieee802154_get_dev(struct net * net,const struct ieee802154_addr * addr)32 ieee802154_get_dev(struct net *net, const struct ieee802154_addr *addr)
33 {
34 	struct net_device *dev = NULL;
35 	struct net_device *tmp;
36 	__le16 pan_id, short_addr;
37 	u8 hwaddr[IEEE802154_ADDR_LEN];
38 
39 	switch (addr->mode) {
40 	case IEEE802154_ADDR_LONG:
41 		ieee802154_devaddr_to_raw(hwaddr, addr->extended_addr);
42 		rcu_read_lock();
43 		dev = dev_getbyhwaddr_rcu(net, ARPHRD_IEEE802154, hwaddr);
44 		dev_hold(dev);
45 		rcu_read_unlock();
46 		break;
47 	case IEEE802154_ADDR_SHORT:
48 		if (addr->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST) ||
49 		    addr->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
50 		    addr->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST))
51 			break;
52 
53 		rtnl_lock();
54 
55 		for_each_netdev(net, tmp) {
56 			if (tmp->type != ARPHRD_IEEE802154)
57 				continue;
58 
59 			pan_id = tmp->ieee802154_ptr->pan_id;
60 			short_addr = tmp->ieee802154_ptr->short_addr;
61 			if (pan_id == addr->pan_id &&
62 			    short_addr == addr->short_addr) {
63 				dev = tmp;
64 				dev_hold(dev);
65 				break;
66 			}
67 		}
68 
69 		rtnl_unlock();
70 		break;
71 	default:
72 		pr_warn("Unsupported ieee802154 address type: %d\n",
73 			addr->mode);
74 		break;
75 	}
76 
77 	return dev;
78 }
79 
ieee802154_sock_release(struct socket * sock)80 static int ieee802154_sock_release(struct socket *sock)
81 {
82 	struct sock *sk = sock->sk;
83 
84 	if (sk) {
85 		sock->sk = NULL;
86 		sk->sk_prot->close(sk, 0);
87 	}
88 	return 0;
89 }
90 
ieee802154_sock_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)91 static int ieee802154_sock_sendmsg(struct socket *sock, struct msghdr *msg,
92 				   size_t len)
93 {
94 	struct sock *sk = sock->sk;
95 
96 	return sk->sk_prot->sendmsg(sk, msg, len);
97 }
98 
ieee802154_sock_bind(struct socket * sock,struct sockaddr * uaddr,int addr_len)99 static int ieee802154_sock_bind(struct socket *sock, struct sockaddr *uaddr,
100 				int addr_len)
101 {
102 	struct sock *sk = sock->sk;
103 
104 	if (sk->sk_prot->bind)
105 		return sk->sk_prot->bind(sk, uaddr, addr_len);
106 
107 	return sock_no_bind(sock, uaddr, addr_len);
108 }
109 
ieee802154_sock_connect(struct socket * sock,struct sockaddr * uaddr,int addr_len,int flags)110 static int ieee802154_sock_connect(struct socket *sock, struct sockaddr *uaddr,
111 				   int addr_len, int flags)
112 {
113 	struct sock *sk = sock->sk;
114 
115 	if (addr_len < sizeof(uaddr->sa_family))
116 		return -EINVAL;
117 
118 	if (uaddr->sa_family == AF_UNSPEC)
119 		return sk->sk_prot->disconnect(sk, flags);
120 
121 	return sk->sk_prot->connect(sk, uaddr, addr_len);
122 }
123 
ieee802154_dev_ioctl(struct sock * sk,struct ifreq __user * arg,unsigned int cmd)124 static int ieee802154_dev_ioctl(struct sock *sk, struct ifreq __user *arg,
125 				unsigned int cmd)
126 {
127 	struct ifreq ifr;
128 	int ret = -ENOIOCTLCMD;
129 	struct net_device *dev;
130 
131 	if (get_user_ifreq(&ifr, NULL, arg))
132 		return -EFAULT;
133 
134 	ifr.ifr_name[IFNAMSIZ-1] = 0;
135 
136 	dev_load(sock_net(sk), ifr.ifr_name);
137 	dev = dev_get_by_name(sock_net(sk), ifr.ifr_name);
138 
139 	if (!dev)
140 		return -ENODEV;
141 
142 	if (dev->type == ARPHRD_IEEE802154 && dev->netdev_ops->ndo_do_ioctl)
143 		ret = dev->netdev_ops->ndo_do_ioctl(dev, &ifr, cmd);
144 
145 	if (!ret && put_user_ifreq(&ifr, arg))
146 		ret = -EFAULT;
147 	dev_put(dev);
148 
149 	return ret;
150 }
151 
ieee802154_sock_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)152 static int ieee802154_sock_ioctl(struct socket *sock, unsigned int cmd,
153 				 unsigned long arg)
154 {
155 	struct sock *sk = sock->sk;
156 
157 	switch (cmd) {
158 	case SIOCGIFADDR:
159 	case SIOCSIFADDR:
160 		return ieee802154_dev_ioctl(sk, (struct ifreq __user *)arg,
161 				cmd);
162 	default:
163 		if (!sk->sk_prot->ioctl)
164 			return -ENOIOCTLCMD;
165 		return sk_ioctl(sk, cmd, (void __user *)arg);
166 	}
167 }
168 
169 /* RAW Sockets (802.15.4 created in userspace) */
170 static HLIST_HEAD(raw_head);
171 static DEFINE_RWLOCK(raw_lock);
172 
raw_hash(struct sock * sk)173 static int raw_hash(struct sock *sk)
174 {
175 	write_lock_bh(&raw_lock);
176 	sk_add_node(sk, &raw_head);
177 	write_unlock_bh(&raw_lock);
178 	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
179 
180 	return 0;
181 }
182 
raw_unhash(struct sock * sk)183 static void raw_unhash(struct sock *sk)
184 {
185 	write_lock_bh(&raw_lock);
186 	if (sk_del_node_init(sk))
187 		sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
188 	write_unlock_bh(&raw_lock);
189 }
190 
raw_close(struct sock * sk,long timeout)191 static void raw_close(struct sock *sk, long timeout)
192 {
193 	sk_common_release(sk);
194 }
195 
raw_bind(struct sock * sk,struct sockaddr * _uaddr,int len)196 static int raw_bind(struct sock *sk, struct sockaddr *_uaddr, int len)
197 {
198 	struct ieee802154_addr addr;
199 	struct sockaddr_ieee802154 *uaddr = (struct sockaddr_ieee802154 *)_uaddr;
200 	int err = 0;
201 	struct net_device *dev = NULL;
202 
203 	err = ieee802154_sockaddr_check_size(uaddr, len);
204 	if (err < 0)
205 		return err;
206 
207 	uaddr = (struct sockaddr_ieee802154 *)_uaddr;
208 	if (uaddr->family != AF_IEEE802154)
209 		return -EINVAL;
210 
211 	lock_sock(sk);
212 
213 	ieee802154_addr_from_sa(&addr, &uaddr->addr);
214 	dev = ieee802154_get_dev(sock_net(sk), &addr);
215 	if (!dev) {
216 		err = -ENODEV;
217 		goto out;
218 	}
219 
220 	sk->sk_bound_dev_if = dev->ifindex;
221 	sk_dst_reset(sk);
222 
223 	dev_put(dev);
224 out:
225 	release_sock(sk);
226 
227 	return err;
228 }
229 
raw_connect(struct sock * sk,struct sockaddr * uaddr,int addr_len)230 static int raw_connect(struct sock *sk, struct sockaddr *uaddr,
231 		       int addr_len)
232 {
233 	return -ENOTSUPP;
234 }
235 
raw_disconnect(struct sock * sk,int flags)236 static int raw_disconnect(struct sock *sk, int flags)
237 {
238 	return 0;
239 }
240 
raw_sendmsg(struct sock * sk,struct msghdr * msg,size_t size)241 static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
242 {
243 	struct net_device *dev;
244 	unsigned int mtu;
245 	struct sk_buff *skb;
246 	int hlen, tlen;
247 	int err;
248 
249 	if (msg->msg_flags & MSG_OOB) {
250 		pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
251 		return -EOPNOTSUPP;
252 	}
253 
254 	lock_sock(sk);
255 	if (!sk->sk_bound_dev_if)
256 		dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
257 	else
258 		dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if);
259 	release_sock(sk);
260 
261 	if (!dev) {
262 		pr_debug("no dev\n");
263 		err = -ENXIO;
264 		goto out;
265 	}
266 
267 	mtu = IEEE802154_MTU;
268 	pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
269 
270 	if (size > mtu) {
271 		pr_debug("size = %zu, mtu = %u\n", size, mtu);
272 		err = -EMSGSIZE;
273 		goto out_dev;
274 	}
275 	if (!size) {
276 		err = 0;
277 		goto out_dev;
278 	}
279 
280 	hlen = LL_RESERVED_SPACE(dev);
281 	tlen = dev->needed_tailroom;
282 	skb = sock_alloc_send_skb(sk, hlen + tlen + size,
283 				  msg->msg_flags & MSG_DONTWAIT, &err);
284 	if (!skb)
285 		goto out_dev;
286 
287 	skb_reserve(skb, hlen);
288 
289 	skb_reset_mac_header(skb);
290 	skb_reset_network_header(skb);
291 
292 	err = memcpy_from_msg(skb_put(skb, size), msg, size);
293 	if (err < 0)
294 		goto out_skb;
295 
296 	skb->dev = dev;
297 	skb->protocol = htons(ETH_P_IEEE802154);
298 
299 	err = dev_queue_xmit(skb);
300 	if (err > 0)
301 		err = net_xmit_errno(err);
302 
303 	dev_put(dev);
304 
305 	return err ?: size;
306 
307 out_skb:
308 	kfree_skb(skb);
309 out_dev:
310 	dev_put(dev);
311 out:
312 	return err;
313 }
314 
raw_recvmsg(struct sock * sk,struct msghdr * msg,size_t len,int flags,int * addr_len)315 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
316 		       int flags, int *addr_len)
317 {
318 	size_t copied = 0;
319 	int err = -EOPNOTSUPP;
320 	struct sk_buff *skb;
321 
322 	skb = skb_recv_datagram(sk, flags, &err);
323 	if (!skb)
324 		goto out;
325 
326 	copied = skb->len;
327 	if (len < copied) {
328 		msg->msg_flags |= MSG_TRUNC;
329 		copied = len;
330 	}
331 
332 	err = skb_copy_datagram_msg(skb, 0, msg, copied);
333 	if (err)
334 		goto done;
335 
336 	sock_recv_cmsgs(msg, sk, skb);
337 
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;
346 }
347 
raw_rcv_skb(struct sock * sk,struct sk_buff * skb)348 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
349 {
350 	skb = skb_share_check(skb, GFP_ATOMIC);
351 	if (!skb)
352 		return NET_RX_DROP;
353 
354 	if (sock_queue_rcv_skb(sk, skb) < 0) {
355 		kfree_skb(skb);
356 		return NET_RX_DROP;
357 	}
358 
359 	return NET_RX_SUCCESS;
360 }
361 
ieee802154_raw_deliver(struct net_device * dev,struct sk_buff * skb)362 static void ieee802154_raw_deliver(struct net_device *dev, struct sk_buff *skb)
363 {
364 	struct sock *sk;
365 
366 	read_lock(&raw_lock);
367 	sk_for_each(sk, &raw_head) {
368 		bh_lock_sock(sk);
369 		if (!sk->sk_bound_dev_if ||
370 		    sk->sk_bound_dev_if == dev->ifindex) {
371 			struct sk_buff *clone;
372 
373 			clone = skb_clone(skb, GFP_ATOMIC);
374 			if (clone)
375 				raw_rcv_skb(sk, clone);
376 		}
377 		bh_unlock_sock(sk);
378 	}
379 	read_unlock(&raw_lock);
380 }
381 
raw_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen)382 static int raw_getsockopt(struct sock *sk, int level, int optname,
383 			  char __user *optval, int __user *optlen)
384 {
385 	return -EOPNOTSUPP;
386 }
387 
raw_setsockopt(struct sock * sk,int level,int optname,sockptr_t optval,unsigned int optlen)388 static int raw_setsockopt(struct sock *sk, int level, int optname,
389 			  sockptr_t optval, unsigned int optlen)
390 {
391 	return -EOPNOTSUPP;
392 }
393 
394 static struct proto ieee802154_raw_prot = {
395 	.name		= "IEEE-802.15.4-RAW",
396 	.owner		= THIS_MODULE,
397 	.obj_size	= sizeof(struct sock),
398 	.close		= raw_close,
399 	.bind		= raw_bind,
400 	.sendmsg	= raw_sendmsg,
401 	.recvmsg	= raw_recvmsg,
402 	.hash		= raw_hash,
403 	.unhash		= raw_unhash,
404 	.connect	= raw_connect,
405 	.disconnect	= raw_disconnect,
406 	.getsockopt	= raw_getsockopt,
407 	.setsockopt	= raw_setsockopt,
408 };
409 
410 static const struct proto_ops ieee802154_raw_ops = {
411 	.family		   = PF_IEEE802154,
412 	.owner		   = THIS_MODULE,
413 	.release	   = ieee802154_sock_release,
414 	.bind		   = ieee802154_sock_bind,
415 	.connect	   = ieee802154_sock_connect,
416 	.socketpair	   = sock_no_socketpair,
417 	.accept		   = sock_no_accept,
418 	.getname	   = sock_no_getname,
419 	.poll		   = datagram_poll,
420 	.ioctl		   = ieee802154_sock_ioctl,
421 	.gettstamp	   = sock_gettstamp,
422 	.listen		   = sock_no_listen,
423 	.shutdown	   = sock_no_shutdown,
424 	.setsockopt	   = sock_common_setsockopt,
425 	.getsockopt	   = sock_common_getsockopt,
426 	.sendmsg	   = ieee802154_sock_sendmsg,
427 	.recvmsg	   = sock_common_recvmsg,
428 	.mmap		   = sock_no_mmap,
429 };
430 
431 /* DGRAM Sockets (802.15.4 dataframes) */
432 static HLIST_HEAD(dgram_head);
433 static DEFINE_RWLOCK(dgram_lock);
434 
435 struct dgram_sock {
436 	struct sock sk;
437 
438 	struct ieee802154_addr src_addr;
439 	struct ieee802154_addr dst_addr;
440 
441 	unsigned int bound:1;
442 	unsigned int connected:1;
443 	unsigned int want_ack:1;
444 	unsigned int want_lqi:1;
445 	unsigned int secen:1;
446 	unsigned int secen_override:1;
447 	unsigned int seclevel:3;
448 	unsigned int seclevel_override:1;
449 };
450 
dgram_sk(const struct sock * sk)451 static inline struct dgram_sock *dgram_sk(const struct sock *sk)
452 {
453 	return container_of(sk, struct dgram_sock, sk);
454 }
455 
dgram_hash(struct sock * sk)456 static int dgram_hash(struct sock *sk)
457 {
458 	write_lock_bh(&dgram_lock);
459 	sk_add_node(sk, &dgram_head);
460 	write_unlock_bh(&dgram_lock);
461 	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
462 
463 	return 0;
464 }
465 
dgram_unhash(struct sock * sk)466 static void dgram_unhash(struct sock *sk)
467 {
468 	write_lock_bh(&dgram_lock);
469 	if (sk_del_node_init(sk))
470 		sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
471 	write_unlock_bh(&dgram_lock);
472 }
473 
dgram_init(struct sock * sk)474 static int dgram_init(struct sock *sk)
475 {
476 	struct dgram_sock *ro = dgram_sk(sk);
477 
478 	ro->want_ack = 1;
479 	ro->want_lqi = 0;
480 	return 0;
481 }
482 
dgram_close(struct sock * sk,long timeout)483 static void dgram_close(struct sock *sk, long timeout)
484 {
485 	sk_common_release(sk);
486 }
487 
dgram_bind(struct sock * sk,struct sockaddr * uaddr,int len)488 static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len)
489 {
490 	struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
491 	struct ieee802154_addr haddr;
492 	struct dgram_sock *ro = dgram_sk(sk);
493 	int err = -EINVAL;
494 	struct net_device *dev;
495 
496 	lock_sock(sk);
497 
498 	ro->bound = 0;
499 
500 	err = ieee802154_sockaddr_check_size(addr, len);
501 	if (err < 0)
502 		goto out;
503 
504 	if (addr->family != AF_IEEE802154) {
505 		err = -EINVAL;
506 		goto out;
507 	}
508 
509 	ieee802154_addr_from_sa(&haddr, &addr->addr);
510 	dev = ieee802154_get_dev(sock_net(sk), &haddr);
511 	if (!dev) {
512 		err = -ENODEV;
513 		goto out;
514 	}
515 
516 	if (dev->type != ARPHRD_IEEE802154) {
517 		err = -ENODEV;
518 		goto out_put;
519 	}
520 
521 	ro->src_addr = haddr;
522 
523 	ro->bound = 1;
524 	err = 0;
525 out_put:
526 	dev_put(dev);
527 out:
528 	release_sock(sk);
529 
530 	return err;
531 }
532 
dgram_ioctl(struct sock * sk,int cmd,int * karg)533 static int dgram_ioctl(struct sock *sk, int cmd, int *karg)
534 {
535 	switch (cmd) {
536 	case SIOCOUTQ:
537 	{
538 		*karg = sk_wmem_alloc_get(sk);
539 
540 		return 0;
541 	}
542 
543 	case SIOCINQ:
544 	{
545 		struct sk_buff *skb;
546 
547 		*karg = 0;
548 		spin_lock_bh(&sk->sk_receive_queue.lock);
549 		skb = skb_peek(&sk->sk_receive_queue);
550 		if (skb) {
551 			/* We will only return the amount
552 			 * of this packet since that is all
553 			 * that will be read.
554 			 */
555 			*karg = skb->len - ieee802154_hdr_length(skb);
556 		}
557 		spin_unlock_bh(&sk->sk_receive_queue.lock);
558 		return 0;
559 	}
560 	}
561 
562 	return -ENOIOCTLCMD;
563 }
564 
565 /* FIXME: autobind */
dgram_connect(struct sock * sk,struct sockaddr * uaddr,int len)566 static int dgram_connect(struct sock *sk, struct sockaddr *uaddr,
567 			 int len)
568 {
569 	struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
570 	struct dgram_sock *ro = dgram_sk(sk);
571 	int err = 0;
572 
573 	err = ieee802154_sockaddr_check_size(addr, len);
574 	if (err < 0)
575 		return err;
576 
577 	if (addr->family != AF_IEEE802154)
578 		return -EINVAL;
579 
580 	lock_sock(sk);
581 
582 	if (!ro->bound) {
583 		err = -ENETUNREACH;
584 		goto out;
585 	}
586 
587 	ieee802154_addr_from_sa(&ro->dst_addr, &addr->addr);
588 	ro->connected = 1;
589 
590 out:
591 	release_sock(sk);
592 	return err;
593 }
594 
dgram_disconnect(struct sock * sk,int flags)595 static int dgram_disconnect(struct sock *sk, int flags)
596 {
597 	struct dgram_sock *ro = dgram_sk(sk);
598 
599 	lock_sock(sk);
600 	ro->connected = 0;
601 	release_sock(sk);
602 
603 	return 0;
604 }
605 
dgram_sendmsg(struct sock * sk,struct msghdr * msg,size_t size)606 static int dgram_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
607 {
608 	struct net_device *dev;
609 	unsigned int mtu;
610 	struct sk_buff *skb;
611 	struct ieee802154_mac_cb *cb;
612 	struct dgram_sock *ro = dgram_sk(sk);
613 	struct ieee802154_addr dst_addr;
614 	DECLARE_SOCKADDR(struct sockaddr_ieee802154*, daddr, msg->msg_name);
615 	int hlen, tlen;
616 	int err;
617 
618 	if (msg->msg_flags & MSG_OOB) {
619 		pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
620 		return -EOPNOTSUPP;
621 	}
622 
623 	if (msg->msg_name) {
624 		if (ro->connected)
625 			return -EISCONN;
626 		if (msg->msg_namelen < IEEE802154_MIN_NAMELEN)
627 			return -EINVAL;
628 		err = ieee802154_sockaddr_check_size(daddr, msg->msg_namelen);
629 		if (err < 0)
630 			return err;
631 		ieee802154_addr_from_sa(&dst_addr, &daddr->addr);
632 	} else {
633 		if (!ro->connected)
634 			return -EDESTADDRREQ;
635 		dst_addr = ro->dst_addr;
636 	}
637 
638 	if (!ro->bound)
639 		dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
640 	else
641 		dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr);
642 
643 	if (!dev) {
644 		pr_debug("no dev\n");
645 		err = -ENXIO;
646 		goto out;
647 	}
648 	mtu = IEEE802154_MTU;
649 	pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
650 
651 	if (size > mtu) {
652 		pr_debug("size = %zu, mtu = %u\n", size, mtu);
653 		err = -EMSGSIZE;
654 		goto out_dev;
655 	}
656 
657 	hlen = LL_RESERVED_SPACE(dev);
658 	tlen = dev->needed_tailroom;
659 	skb = sock_alloc_send_skb(sk, hlen + tlen + size,
660 				  msg->msg_flags & MSG_DONTWAIT,
661 				  &err);
662 	if (!skb)
663 		goto out_dev;
664 
665 	skb_reserve(skb, hlen);
666 
667 	skb_reset_network_header(skb);
668 
669 	cb = mac_cb_init(skb);
670 	cb->type = IEEE802154_FC_TYPE_DATA;
671 	cb->ackreq = ro->want_ack;
672 	cb->secen = ro->secen;
673 	cb->secen_override = ro->secen_override;
674 	cb->seclevel = ro->seclevel;
675 	cb->seclevel_override = ro->seclevel_override;
676 
677 	err = wpan_dev_hard_header(skb, dev, &dst_addr,
678 				   ro->bound ? &ro->src_addr : NULL, size);
679 	if (err < 0)
680 		goto out_skb;
681 
682 	err = memcpy_from_msg(skb_put(skb, size), msg, size);
683 	if (err < 0)
684 		goto out_skb;
685 
686 	skb->dev = dev;
687 	skb->protocol = htons(ETH_P_IEEE802154);
688 
689 	err = dev_queue_xmit(skb);
690 	if (err > 0)
691 		err = net_xmit_errno(err);
692 
693 	dev_put(dev);
694 
695 	return err ?: size;
696 
697 out_skb:
698 	kfree_skb(skb);
699 out_dev:
700 	dev_put(dev);
701 out:
702 	return err;
703 }
704 
dgram_recvmsg(struct sock * sk,struct msghdr * msg,size_t len,int flags,int * addr_len)705 static int dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
706 			 int flags, int *addr_len)
707 {
708 	size_t copied = 0;
709 	int err = -EOPNOTSUPP;
710 	struct sk_buff *skb;
711 	struct dgram_sock *ro = dgram_sk(sk);
712 	DECLARE_SOCKADDR(struct sockaddr_ieee802154 *, saddr, msg->msg_name);
713 
714 	skb = skb_recv_datagram(sk, flags, &err);
715 	if (!skb)
716 		goto out;
717 
718 	copied = skb->len;
719 	if (len < copied) {
720 		msg->msg_flags |= MSG_TRUNC;
721 		copied = len;
722 	}
723 
724 	/* FIXME: skip headers if necessary ?! */
725 	err = skb_copy_datagram_msg(skb, 0, msg, copied);
726 	if (err)
727 		goto done;
728 
729 	sock_recv_cmsgs(msg, sk, skb);
730 
731 	if (saddr) {
732 		/* Clear the implicit padding in struct sockaddr_ieee802154
733 		 * (16 bits between 'family' and 'addr') and in struct
734 		 * ieee802154_addr_sa (16 bits at the end of the structure).
735 		 */
736 		memset(saddr, 0, sizeof(*saddr));
737 
738 		saddr->family = AF_IEEE802154;
739 		ieee802154_addr_to_sa(&saddr->addr, &mac_cb(skb)->source);
740 		*addr_len = sizeof(*saddr);
741 	}
742 
743 	if (ro->want_lqi) {
744 		err = put_cmsg(msg, SOL_IEEE802154, WPAN_WANTLQI,
745 			       sizeof(uint8_t), &(mac_cb(skb)->lqi));
746 		if (err)
747 			goto done;
748 	}
749 
750 	if (flags & MSG_TRUNC)
751 		copied = skb->len;
752 done:
753 	skb_free_datagram(sk, skb);
754 out:
755 	if (err)
756 		return err;
757 	return copied;
758 }
759 
dgram_rcv_skb(struct sock * sk,struct sk_buff * skb)760 static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb)
761 {
762 	skb = skb_share_check(skb, GFP_ATOMIC);
763 	if (!skb)
764 		return NET_RX_DROP;
765 
766 	if (sock_queue_rcv_skb(sk, skb) < 0) {
767 		kfree_skb(skb);
768 		return NET_RX_DROP;
769 	}
770 
771 	return NET_RX_SUCCESS;
772 }
773 
774 static inline bool
ieee802154_match_sock(__le64 hw_addr,__le16 pan_id,__le16 short_addr,struct dgram_sock * ro)775 ieee802154_match_sock(__le64 hw_addr, __le16 pan_id, __le16 short_addr,
776 		      struct dgram_sock *ro)
777 {
778 	if (!ro->bound)
779 		return true;
780 
781 	if (ro->src_addr.mode == IEEE802154_ADDR_LONG &&
782 	    hw_addr == ro->src_addr.extended_addr)
783 		return true;
784 
785 	if (ro->src_addr.mode == IEEE802154_ADDR_SHORT &&
786 	    pan_id == ro->src_addr.pan_id &&
787 	    short_addr == ro->src_addr.short_addr)
788 		return true;
789 
790 	return false;
791 }
792 
ieee802154_dgram_deliver(struct net_device * dev,struct sk_buff * skb)793 static int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb)
794 {
795 	struct sock *sk, *prev = NULL;
796 	int ret = NET_RX_SUCCESS;
797 	__le16 pan_id, short_addr;
798 	__le64 hw_addr;
799 
800 	/* Data frame processing */
801 	BUG_ON(dev->type != ARPHRD_IEEE802154);
802 
803 	pan_id = dev->ieee802154_ptr->pan_id;
804 	short_addr = dev->ieee802154_ptr->short_addr;
805 	hw_addr = dev->ieee802154_ptr->extended_addr;
806 
807 	read_lock(&dgram_lock);
808 	sk_for_each(sk, &dgram_head) {
809 		if (ieee802154_match_sock(hw_addr, pan_id, short_addr,
810 					  dgram_sk(sk))) {
811 			if (prev) {
812 				struct sk_buff *clone;
813 
814 				clone = skb_clone(skb, GFP_ATOMIC);
815 				if (clone)
816 					dgram_rcv_skb(prev, clone);
817 			}
818 
819 			prev = sk;
820 		}
821 	}
822 
823 	if (prev) {
824 		dgram_rcv_skb(prev, skb);
825 	} else {
826 		kfree_skb(skb);
827 		ret = NET_RX_DROP;
828 	}
829 	read_unlock(&dgram_lock);
830 
831 	return ret;
832 }
833 
dgram_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen)834 static int dgram_getsockopt(struct sock *sk, int level, int optname,
835 			    char __user *optval, int __user *optlen)
836 {
837 	struct dgram_sock *ro = dgram_sk(sk);
838 
839 	int val, len;
840 
841 	if (level != SOL_IEEE802154)
842 		return -EOPNOTSUPP;
843 
844 	if (get_user(len, optlen))
845 		return -EFAULT;
846 
847 	len = min_t(unsigned int, len, sizeof(int));
848 
849 	switch (optname) {
850 	case WPAN_WANTACK:
851 		val = ro->want_ack;
852 		break;
853 	case WPAN_WANTLQI:
854 		val = ro->want_lqi;
855 		break;
856 	case WPAN_SECURITY:
857 		if (!ro->secen_override)
858 			val = WPAN_SECURITY_DEFAULT;
859 		else if (ro->secen)
860 			val = WPAN_SECURITY_ON;
861 		else
862 			val = WPAN_SECURITY_OFF;
863 		break;
864 	case WPAN_SECURITY_LEVEL:
865 		if (!ro->seclevel_override)
866 			val = WPAN_SECURITY_LEVEL_DEFAULT;
867 		else
868 			val = ro->seclevel;
869 		break;
870 	default:
871 		return -ENOPROTOOPT;
872 	}
873 
874 	if (put_user(len, optlen))
875 		return -EFAULT;
876 	if (copy_to_user(optval, &val, len))
877 		return -EFAULT;
878 	return 0;
879 }
880 
dgram_setsockopt(struct sock * sk,int level,int optname,sockptr_t optval,unsigned int optlen)881 static int dgram_setsockopt(struct sock *sk, int level, int optname,
882 			    sockptr_t optval, unsigned int optlen)
883 {
884 	struct dgram_sock *ro = dgram_sk(sk);
885 	struct net *net = sock_net(sk);
886 	int val;
887 	int err = 0;
888 
889 	if (optlen < sizeof(int))
890 		return -EINVAL;
891 
892 	if (copy_from_sockptr(&val, optval, sizeof(int)))
893 		return -EFAULT;
894 
895 	lock_sock(sk);
896 
897 	switch (optname) {
898 	case WPAN_WANTACK:
899 		ro->want_ack = !!val;
900 		break;
901 	case WPAN_WANTLQI:
902 		ro->want_lqi = !!val;
903 		break;
904 	case WPAN_SECURITY:
905 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
906 		    !ns_capable(net->user_ns, CAP_NET_RAW)) {
907 			err = -EPERM;
908 			break;
909 		}
910 
911 		switch (val) {
912 		case WPAN_SECURITY_DEFAULT:
913 			ro->secen_override = 0;
914 			break;
915 		case WPAN_SECURITY_ON:
916 			ro->secen_override = 1;
917 			ro->secen = 1;
918 			break;
919 		case WPAN_SECURITY_OFF:
920 			ro->secen_override = 1;
921 			ro->secen = 0;
922 			break;
923 		default:
924 			err = -EINVAL;
925 			break;
926 		}
927 		break;
928 	case WPAN_SECURITY_LEVEL:
929 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
930 		    !ns_capable(net->user_ns, CAP_NET_RAW)) {
931 			err = -EPERM;
932 			break;
933 		}
934 
935 		if (val < WPAN_SECURITY_LEVEL_DEFAULT ||
936 		    val > IEEE802154_SCF_SECLEVEL_ENC_MIC128) {
937 			err = -EINVAL;
938 		} else if (val == WPAN_SECURITY_LEVEL_DEFAULT) {
939 			ro->seclevel_override = 0;
940 		} else {
941 			ro->seclevel_override = 1;
942 			ro->seclevel = val;
943 		}
944 		break;
945 	default:
946 		err = -ENOPROTOOPT;
947 		break;
948 	}
949 
950 	release_sock(sk);
951 	return err;
952 }
953 
954 static struct proto ieee802154_dgram_prot = {
955 	.name		= "IEEE-802.15.4-MAC",
956 	.owner		= THIS_MODULE,
957 	.obj_size	= sizeof(struct dgram_sock),
958 	.init		= dgram_init,
959 	.close		= dgram_close,
960 	.bind		= dgram_bind,
961 	.sendmsg	= dgram_sendmsg,
962 	.recvmsg	= dgram_recvmsg,
963 	.hash		= dgram_hash,
964 	.unhash		= dgram_unhash,
965 	.connect	= dgram_connect,
966 	.disconnect	= dgram_disconnect,
967 	.ioctl		= dgram_ioctl,
968 	.getsockopt	= dgram_getsockopt,
969 	.setsockopt	= dgram_setsockopt,
970 };
971 
972 static const struct proto_ops ieee802154_dgram_ops = {
973 	.family		   = PF_IEEE802154,
974 	.owner		   = THIS_MODULE,
975 	.release	   = ieee802154_sock_release,
976 	.bind		   = ieee802154_sock_bind,
977 	.connect	   = ieee802154_sock_connect,
978 	.socketpair	   = sock_no_socketpair,
979 	.accept		   = sock_no_accept,
980 	.getname	   = sock_no_getname,
981 	.poll		   = datagram_poll,
982 	.ioctl		   = ieee802154_sock_ioctl,
983 	.gettstamp	   = sock_gettstamp,
984 	.listen		   = sock_no_listen,
985 	.shutdown	   = sock_no_shutdown,
986 	.setsockopt	   = sock_common_setsockopt,
987 	.getsockopt	   = sock_common_getsockopt,
988 	.sendmsg	   = ieee802154_sock_sendmsg,
989 	.recvmsg	   = sock_common_recvmsg,
990 	.mmap		   = sock_no_mmap,
991 };
992 
ieee802154_sock_destruct(struct sock * sk)993 static void ieee802154_sock_destruct(struct sock *sk)
994 {
995 	skb_queue_purge(&sk->sk_receive_queue);
996 }
997 
998 /* Create a socket. Initialise the socket, blank the addresses
999  * set the state.
1000  */
ieee802154_create(struct net * net,struct socket * sock,int protocol,int kern)1001 static int ieee802154_create(struct net *net, struct socket *sock,
1002 			     int protocol, int kern)
1003 {
1004 	struct sock *sk;
1005 	int rc;
1006 	struct proto *proto;
1007 	const struct proto_ops *ops;
1008 
1009 	if (!net_eq(net, &init_net))
1010 		return -EAFNOSUPPORT;
1011 
1012 	switch (sock->type) {
1013 	case SOCK_RAW:
1014 		rc = -EPERM;
1015 		if (!capable(CAP_NET_RAW))
1016 			goto out;
1017 		proto = &ieee802154_raw_prot;
1018 		ops = &ieee802154_raw_ops;
1019 		break;
1020 	case SOCK_DGRAM:
1021 		proto = &ieee802154_dgram_prot;
1022 		ops = &ieee802154_dgram_ops;
1023 		break;
1024 	default:
1025 		rc = -ESOCKTNOSUPPORT;
1026 		goto out;
1027 	}
1028 
1029 	rc = -ENOMEM;
1030 	sk = sk_alloc(net, PF_IEEE802154, GFP_KERNEL, proto, kern);
1031 	if (!sk)
1032 		goto out;
1033 	rc = 0;
1034 
1035 	sock->ops = ops;
1036 
1037 	sock_init_data(sock, sk);
1038 	sk->sk_destruct = ieee802154_sock_destruct;
1039 	sk->sk_family = PF_IEEE802154;
1040 
1041 	/* Checksums on by default */
1042 	sock_set_flag(sk, SOCK_ZAPPED);
1043 
1044 	if (sk->sk_prot->hash) {
1045 		rc = sk->sk_prot->hash(sk);
1046 		if (rc) {
1047 			sk_common_release(sk);
1048 			goto out;
1049 		}
1050 	}
1051 
1052 	if (sk->sk_prot->init) {
1053 		rc = sk->sk_prot->init(sk);
1054 		if (rc)
1055 			sk_common_release(sk);
1056 	}
1057 out:
1058 	return rc;
1059 }
1060 
1061 static const struct net_proto_family ieee802154_family_ops = {
1062 	.family		= PF_IEEE802154,
1063 	.create		= ieee802154_create,
1064 	.owner		= THIS_MODULE,
1065 };
1066 
ieee802154_rcv(struct sk_buff * skb,struct net_device * dev,struct packet_type * pt,struct net_device * orig_dev)1067 static int ieee802154_rcv(struct sk_buff *skb, struct net_device *dev,
1068 			  struct packet_type *pt, struct net_device *orig_dev)
1069 {
1070 	if (!netif_running(dev))
1071 		goto drop;
1072 	pr_debug("got frame, type %d, dev %p\n", dev->type, dev);
1073 #ifdef DEBUG
1074 	print_hex_dump_bytes("ieee802154_rcv ",
1075 			     DUMP_PREFIX_NONE, skb->data, skb->len);
1076 #endif
1077 
1078 	if (!net_eq(dev_net(dev), &init_net))
1079 		goto drop;
1080 
1081 	ieee802154_raw_deliver(dev, skb);
1082 
1083 	if (dev->type != ARPHRD_IEEE802154)
1084 		goto drop;
1085 
1086 	if (skb->pkt_type != PACKET_OTHERHOST)
1087 		return ieee802154_dgram_deliver(dev, skb);
1088 
1089 drop:
1090 	kfree_skb(skb);
1091 	return NET_RX_DROP;
1092 }
1093 
1094 static struct packet_type ieee802154_packet_type = {
1095 	.type = htons(ETH_P_IEEE802154),
1096 	.func = ieee802154_rcv,
1097 };
1098 
af_ieee802154_init(void)1099 static int __init af_ieee802154_init(void)
1100 {
1101 	int rc;
1102 
1103 	rc = proto_register(&ieee802154_raw_prot, 1);
1104 	if (rc)
1105 		goto out;
1106 
1107 	rc = proto_register(&ieee802154_dgram_prot, 1);
1108 	if (rc)
1109 		goto err_dgram;
1110 
1111 	/* Tell SOCKET that we are alive */
1112 	rc = sock_register(&ieee802154_family_ops);
1113 	if (rc)
1114 		goto err_sock;
1115 	dev_add_pack(&ieee802154_packet_type);
1116 
1117 	rc = 0;
1118 	goto out;
1119 
1120 err_sock:
1121 	proto_unregister(&ieee802154_dgram_prot);
1122 err_dgram:
1123 	proto_unregister(&ieee802154_raw_prot);
1124 out:
1125 	return rc;
1126 }
1127 
af_ieee802154_remove(void)1128 static void __exit af_ieee802154_remove(void)
1129 {
1130 	dev_remove_pack(&ieee802154_packet_type);
1131 	sock_unregister(PF_IEEE802154);
1132 	proto_unregister(&ieee802154_dgram_prot);
1133 	proto_unregister(&ieee802154_raw_prot);
1134 }
1135 
1136 module_init(af_ieee802154_init);
1137 module_exit(af_ieee802154_remove);
1138 
1139 MODULE_LICENSE("GPL");
1140 MODULE_DESCRIPTION("IEEE 802.15.4 socket interface");
1141 MODULE_ALIAS_NETPROTO(PF_IEEE802154);
1142