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->sk_prot->ioctl(sk, cmd, 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 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
178 write_unlock_bh(&raw_lock);
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 noblock,int flags,int * addr_len)315 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
316 int noblock, 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, noblock, &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_ts_and_drops(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 .sendpage = sock_no_sendpage,
430 };
431
432 /* DGRAM Sockets (802.15.4 dataframes) */
433 static HLIST_HEAD(dgram_head);
434 static DEFINE_RWLOCK(dgram_lock);
435
436 struct dgram_sock {
437 struct sock sk;
438
439 struct ieee802154_addr src_addr;
440 struct ieee802154_addr dst_addr;
441
442 unsigned int bound:1;
443 unsigned int connected:1;
444 unsigned int want_ack:1;
445 unsigned int want_lqi:1;
446 unsigned int secen:1;
447 unsigned int secen_override:1;
448 unsigned int seclevel:3;
449 unsigned int seclevel_override:1;
450 };
451
dgram_sk(const struct sock * sk)452 static inline struct dgram_sock *dgram_sk(const struct sock *sk)
453 {
454 return container_of(sk, struct dgram_sock, sk);
455 }
456
dgram_hash(struct sock * sk)457 static int dgram_hash(struct sock *sk)
458 {
459 write_lock_bh(&dgram_lock);
460 sk_add_node(sk, &dgram_head);
461 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
462 write_unlock_bh(&dgram_lock);
463
464 return 0;
465 }
466
dgram_unhash(struct sock * sk)467 static void dgram_unhash(struct sock *sk)
468 {
469 write_lock_bh(&dgram_lock);
470 if (sk_del_node_init(sk))
471 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
472 write_unlock_bh(&dgram_lock);
473 }
474
dgram_init(struct sock * sk)475 static int dgram_init(struct sock *sk)
476 {
477 struct dgram_sock *ro = dgram_sk(sk);
478
479 ro->want_ack = 1;
480 ro->want_lqi = 0;
481 return 0;
482 }
483
dgram_close(struct sock * sk,long timeout)484 static void dgram_close(struct sock *sk, long timeout)
485 {
486 sk_common_release(sk);
487 }
488
dgram_bind(struct sock * sk,struct sockaddr * uaddr,int len)489 static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len)
490 {
491 struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
492 struct ieee802154_addr haddr;
493 struct dgram_sock *ro = dgram_sk(sk);
494 int err = -EINVAL;
495 struct net_device *dev;
496
497 lock_sock(sk);
498
499 ro->bound = 0;
500
501 err = ieee802154_sockaddr_check_size(addr, len);
502 if (err < 0)
503 goto out;
504
505 if (addr->family != AF_IEEE802154) {
506 err = -EINVAL;
507 goto out;
508 }
509
510 ieee802154_addr_from_sa(&haddr, &addr->addr);
511 dev = ieee802154_get_dev(sock_net(sk), &haddr);
512 if (!dev) {
513 err = -ENODEV;
514 goto out;
515 }
516
517 if (dev->type != ARPHRD_IEEE802154) {
518 err = -ENODEV;
519 goto out_put;
520 }
521
522 ro->src_addr = haddr;
523
524 ro->bound = 1;
525 err = 0;
526 out_put:
527 dev_put(dev);
528 out:
529 release_sock(sk);
530
531 return err;
532 }
533
dgram_ioctl(struct sock * sk,int cmd,unsigned long arg)534 static int dgram_ioctl(struct sock *sk, int cmd, unsigned long arg)
535 {
536 switch (cmd) {
537 case SIOCOUTQ:
538 {
539 int amount = sk_wmem_alloc_get(sk);
540
541 return put_user(amount, (int __user *)arg);
542 }
543
544 case SIOCINQ:
545 {
546 struct sk_buff *skb;
547 unsigned long amount;
548
549 amount = 0;
550 spin_lock_bh(&sk->sk_receive_queue.lock);
551 skb = skb_peek(&sk->sk_receive_queue);
552 if (skb) {
553 /* We will only return the amount
554 * of this packet since that is all
555 * that will be read.
556 */
557 amount = skb->len - ieee802154_hdr_length(skb);
558 }
559 spin_unlock_bh(&sk->sk_receive_queue.lock);
560 return put_user(amount, (int __user *)arg);
561 }
562 }
563
564 return -ENOIOCTLCMD;
565 }
566
567 /* FIXME: autobind */
dgram_connect(struct sock * sk,struct sockaddr * uaddr,int len)568 static int dgram_connect(struct sock *sk, struct sockaddr *uaddr,
569 int len)
570 {
571 struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
572 struct dgram_sock *ro = dgram_sk(sk);
573 int err = 0;
574
575 err = ieee802154_sockaddr_check_size(addr, len);
576 if (err < 0)
577 return err;
578
579 if (addr->family != AF_IEEE802154)
580 return -EINVAL;
581
582 lock_sock(sk);
583
584 if (!ro->bound) {
585 err = -ENETUNREACH;
586 goto out;
587 }
588
589 ieee802154_addr_from_sa(&ro->dst_addr, &addr->addr);
590 ro->connected = 1;
591
592 out:
593 release_sock(sk);
594 return err;
595 }
596
dgram_disconnect(struct sock * sk,int flags)597 static int dgram_disconnect(struct sock *sk, int flags)
598 {
599 struct dgram_sock *ro = dgram_sk(sk);
600
601 lock_sock(sk);
602 ro->connected = 0;
603 release_sock(sk);
604
605 return 0;
606 }
607
dgram_sendmsg(struct sock * sk,struct msghdr * msg,size_t size)608 static int dgram_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
609 {
610 struct net_device *dev;
611 unsigned int mtu;
612 struct sk_buff *skb;
613 struct ieee802154_mac_cb *cb;
614 struct dgram_sock *ro = dgram_sk(sk);
615 struct ieee802154_addr dst_addr;
616 DECLARE_SOCKADDR(struct sockaddr_ieee802154*, daddr, msg->msg_name);
617 int hlen, tlen;
618 int err;
619
620 if (msg->msg_flags & MSG_OOB) {
621 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
622 return -EOPNOTSUPP;
623 }
624
625 if (msg->msg_name) {
626 if (ro->connected)
627 return -EISCONN;
628 if (msg->msg_namelen < IEEE802154_MIN_NAMELEN)
629 return -EINVAL;
630 err = ieee802154_sockaddr_check_size(daddr, msg->msg_namelen);
631 if (err < 0)
632 return err;
633 ieee802154_addr_from_sa(&dst_addr, &daddr->addr);
634 } else {
635 if (!ro->connected)
636 return -EDESTADDRREQ;
637 dst_addr = ro->dst_addr;
638 }
639
640 if (!ro->bound)
641 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
642 else
643 dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr);
644
645 if (!dev) {
646 pr_debug("no dev\n");
647 err = -ENXIO;
648 goto out;
649 }
650 mtu = IEEE802154_MTU;
651 pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
652
653 if (size > mtu) {
654 pr_debug("size = %zu, mtu = %u\n", size, mtu);
655 err = -EMSGSIZE;
656 goto out_dev;
657 }
658
659 hlen = LL_RESERVED_SPACE(dev);
660 tlen = dev->needed_tailroom;
661 skb = sock_alloc_send_skb(sk, hlen + tlen + size,
662 msg->msg_flags & MSG_DONTWAIT,
663 &err);
664 if (!skb)
665 goto out_dev;
666
667 skb_reserve(skb, hlen);
668
669 skb_reset_network_header(skb);
670
671 cb = mac_cb_init(skb);
672 cb->type = IEEE802154_FC_TYPE_DATA;
673 cb->ackreq = ro->want_ack;
674 cb->secen = ro->secen;
675 cb->secen_override = ro->secen_override;
676 cb->seclevel = ro->seclevel;
677 cb->seclevel_override = ro->seclevel_override;
678
679 err = wpan_dev_hard_header(skb, dev, &dst_addr,
680 ro->bound ? &ro->src_addr : NULL, size);
681 if (err < 0)
682 goto out_skb;
683
684 err = memcpy_from_msg(skb_put(skb, size), msg, size);
685 if (err < 0)
686 goto out_skb;
687
688 skb->dev = dev;
689 skb->protocol = htons(ETH_P_IEEE802154);
690
691 err = dev_queue_xmit(skb);
692 if (err > 0)
693 err = net_xmit_errno(err);
694
695 dev_put(dev);
696
697 return err ?: size;
698
699 out_skb:
700 kfree_skb(skb);
701 out_dev:
702 dev_put(dev);
703 out:
704 return err;
705 }
706
dgram_recvmsg(struct sock * sk,struct msghdr * msg,size_t len,int noblock,int flags,int * addr_len)707 static int dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
708 int noblock, int flags, int *addr_len)
709 {
710 size_t copied = 0;
711 int err = -EOPNOTSUPP;
712 struct sk_buff *skb;
713 struct dgram_sock *ro = dgram_sk(sk);
714 DECLARE_SOCKADDR(struct sockaddr_ieee802154 *, saddr, msg->msg_name);
715
716 skb = skb_recv_datagram(sk, flags, noblock, &err);
717 if (!skb)
718 goto out;
719
720 copied = skb->len;
721 if (len < copied) {
722 msg->msg_flags |= MSG_TRUNC;
723 copied = len;
724 }
725
726 /* FIXME: skip headers if necessary ?! */
727 err = skb_copy_datagram_msg(skb, 0, msg, copied);
728 if (err)
729 goto done;
730
731 sock_recv_ts_and_drops(msg, sk, skb);
732
733 if (saddr) {
734 /* Clear the implicit padding in struct sockaddr_ieee802154
735 * (16 bits between 'family' and 'addr') and in struct
736 * ieee802154_addr_sa (16 bits at the end of the structure).
737 */
738 memset(saddr, 0, sizeof(*saddr));
739
740 saddr->family = AF_IEEE802154;
741 ieee802154_addr_to_sa(&saddr->addr, &mac_cb(skb)->source);
742 *addr_len = sizeof(*saddr);
743 }
744
745 if (ro->want_lqi) {
746 err = put_cmsg(msg, SOL_IEEE802154, WPAN_WANTLQI,
747 sizeof(uint8_t), &(mac_cb(skb)->lqi));
748 if (err)
749 goto done;
750 }
751
752 if (flags & MSG_TRUNC)
753 copied = skb->len;
754 done:
755 skb_free_datagram(sk, skb);
756 out:
757 if (err)
758 return err;
759 return copied;
760 }
761
dgram_rcv_skb(struct sock * sk,struct sk_buff * skb)762 static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb)
763 {
764 skb = skb_share_check(skb, GFP_ATOMIC);
765 if (!skb)
766 return NET_RX_DROP;
767
768 if (sock_queue_rcv_skb(sk, skb) < 0) {
769 kfree_skb(skb);
770 return NET_RX_DROP;
771 }
772
773 return NET_RX_SUCCESS;
774 }
775
776 static inline bool
ieee802154_match_sock(__le64 hw_addr,__le16 pan_id,__le16 short_addr,struct dgram_sock * ro)777 ieee802154_match_sock(__le64 hw_addr, __le16 pan_id, __le16 short_addr,
778 struct dgram_sock *ro)
779 {
780 if (!ro->bound)
781 return true;
782
783 if (ro->src_addr.mode == IEEE802154_ADDR_LONG &&
784 hw_addr == ro->src_addr.extended_addr)
785 return true;
786
787 if (ro->src_addr.mode == IEEE802154_ADDR_SHORT &&
788 pan_id == ro->src_addr.pan_id &&
789 short_addr == ro->src_addr.short_addr)
790 return true;
791
792 return false;
793 }
794
ieee802154_dgram_deliver(struct net_device * dev,struct sk_buff * skb)795 static int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb)
796 {
797 struct sock *sk, *prev = NULL;
798 int ret = NET_RX_SUCCESS;
799 __le16 pan_id, short_addr;
800 __le64 hw_addr;
801
802 /* Data frame processing */
803 BUG_ON(dev->type != ARPHRD_IEEE802154);
804
805 pan_id = dev->ieee802154_ptr->pan_id;
806 short_addr = dev->ieee802154_ptr->short_addr;
807 hw_addr = dev->ieee802154_ptr->extended_addr;
808
809 read_lock(&dgram_lock);
810 sk_for_each(sk, &dgram_head) {
811 if (ieee802154_match_sock(hw_addr, pan_id, short_addr,
812 dgram_sk(sk))) {
813 if (prev) {
814 struct sk_buff *clone;
815
816 clone = skb_clone(skb, GFP_ATOMIC);
817 if (clone)
818 dgram_rcv_skb(prev, clone);
819 }
820
821 prev = sk;
822 }
823 }
824
825 if (prev) {
826 dgram_rcv_skb(prev, skb);
827 } else {
828 kfree_skb(skb);
829 ret = NET_RX_DROP;
830 }
831 read_unlock(&dgram_lock);
832
833 return ret;
834 }
835
dgram_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen)836 static int dgram_getsockopt(struct sock *sk, int level, int optname,
837 char __user *optval, int __user *optlen)
838 {
839 struct dgram_sock *ro = dgram_sk(sk);
840
841 int val, len;
842
843 if (level != SOL_IEEE802154)
844 return -EOPNOTSUPP;
845
846 if (get_user(len, optlen))
847 return -EFAULT;
848
849 len = min_t(unsigned int, len, sizeof(int));
850
851 switch (optname) {
852 case WPAN_WANTACK:
853 val = ro->want_ack;
854 break;
855 case WPAN_WANTLQI:
856 val = ro->want_lqi;
857 break;
858 case WPAN_SECURITY:
859 if (!ro->secen_override)
860 val = WPAN_SECURITY_DEFAULT;
861 else if (ro->secen)
862 val = WPAN_SECURITY_ON;
863 else
864 val = WPAN_SECURITY_OFF;
865 break;
866 case WPAN_SECURITY_LEVEL:
867 if (!ro->seclevel_override)
868 val = WPAN_SECURITY_LEVEL_DEFAULT;
869 else
870 val = ro->seclevel;
871 break;
872 default:
873 return -ENOPROTOOPT;
874 }
875
876 if (put_user(len, optlen))
877 return -EFAULT;
878 if (copy_to_user(optval, &val, len))
879 return -EFAULT;
880 return 0;
881 }
882
dgram_setsockopt(struct sock * sk,int level,int optname,sockptr_t optval,unsigned int optlen)883 static int dgram_setsockopt(struct sock *sk, int level, int optname,
884 sockptr_t optval, unsigned int optlen)
885 {
886 struct dgram_sock *ro = dgram_sk(sk);
887 struct net *net = sock_net(sk);
888 int val;
889 int err = 0;
890
891 if (optlen < sizeof(int))
892 return -EINVAL;
893
894 if (copy_from_sockptr(&val, optval, sizeof(int)))
895 return -EFAULT;
896
897 lock_sock(sk);
898
899 switch (optname) {
900 case WPAN_WANTACK:
901 ro->want_ack = !!val;
902 break;
903 case WPAN_WANTLQI:
904 ro->want_lqi = !!val;
905 break;
906 case WPAN_SECURITY:
907 if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
908 !ns_capable(net->user_ns, CAP_NET_RAW)) {
909 err = -EPERM;
910 break;
911 }
912
913 switch (val) {
914 case WPAN_SECURITY_DEFAULT:
915 ro->secen_override = 0;
916 break;
917 case WPAN_SECURITY_ON:
918 ro->secen_override = 1;
919 ro->secen = 1;
920 break;
921 case WPAN_SECURITY_OFF:
922 ro->secen_override = 1;
923 ro->secen = 0;
924 break;
925 default:
926 err = -EINVAL;
927 break;
928 }
929 break;
930 case WPAN_SECURITY_LEVEL:
931 if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
932 !ns_capable(net->user_ns, CAP_NET_RAW)) {
933 err = -EPERM;
934 break;
935 }
936
937 if (val < WPAN_SECURITY_LEVEL_DEFAULT ||
938 val > IEEE802154_SCF_SECLEVEL_ENC_MIC128) {
939 err = -EINVAL;
940 } else if (val == WPAN_SECURITY_LEVEL_DEFAULT) {
941 ro->seclevel_override = 0;
942 } else {
943 ro->seclevel_override = 1;
944 ro->seclevel = val;
945 }
946 break;
947 default:
948 err = -ENOPROTOOPT;
949 break;
950 }
951
952 release_sock(sk);
953 return err;
954 }
955
956 static struct proto ieee802154_dgram_prot = {
957 .name = "IEEE-802.15.4-MAC",
958 .owner = THIS_MODULE,
959 .obj_size = sizeof(struct dgram_sock),
960 .init = dgram_init,
961 .close = dgram_close,
962 .bind = dgram_bind,
963 .sendmsg = dgram_sendmsg,
964 .recvmsg = dgram_recvmsg,
965 .hash = dgram_hash,
966 .unhash = dgram_unhash,
967 .connect = dgram_connect,
968 .disconnect = dgram_disconnect,
969 .ioctl = dgram_ioctl,
970 .getsockopt = dgram_getsockopt,
971 .setsockopt = dgram_setsockopt,
972 };
973
974 static const struct proto_ops ieee802154_dgram_ops = {
975 .family = PF_IEEE802154,
976 .owner = THIS_MODULE,
977 .release = ieee802154_sock_release,
978 .bind = ieee802154_sock_bind,
979 .connect = ieee802154_sock_connect,
980 .socketpair = sock_no_socketpair,
981 .accept = sock_no_accept,
982 .getname = sock_no_getname,
983 .poll = datagram_poll,
984 .ioctl = ieee802154_sock_ioctl,
985 .gettstamp = sock_gettstamp,
986 .listen = sock_no_listen,
987 .shutdown = sock_no_shutdown,
988 .setsockopt = sock_common_setsockopt,
989 .getsockopt = sock_common_getsockopt,
990 .sendmsg = ieee802154_sock_sendmsg,
991 .recvmsg = sock_common_recvmsg,
992 .mmap = sock_no_mmap,
993 .sendpage = sock_no_sendpage,
994 };
995
ieee802154_sock_destruct(struct sock * sk)996 static void ieee802154_sock_destruct(struct sock *sk)
997 {
998 skb_queue_purge(&sk->sk_receive_queue);
999 }
1000
1001 /* Create a socket. Initialise the socket, blank the addresses
1002 * set the state.
1003 */
ieee802154_create(struct net * net,struct socket * sock,int protocol,int kern)1004 static int ieee802154_create(struct net *net, struct socket *sock,
1005 int protocol, int kern)
1006 {
1007 struct sock *sk;
1008 int rc;
1009 struct proto *proto;
1010 const struct proto_ops *ops;
1011
1012 if (!net_eq(net, &init_net))
1013 return -EAFNOSUPPORT;
1014
1015 switch (sock->type) {
1016 case SOCK_RAW:
1017 rc = -EPERM;
1018 if (!capable(CAP_NET_RAW))
1019 goto out;
1020 proto = &ieee802154_raw_prot;
1021 ops = &ieee802154_raw_ops;
1022 break;
1023 case SOCK_DGRAM:
1024 proto = &ieee802154_dgram_prot;
1025 ops = &ieee802154_dgram_ops;
1026 break;
1027 default:
1028 rc = -ESOCKTNOSUPPORT;
1029 goto out;
1030 }
1031
1032 rc = -ENOMEM;
1033 sk = sk_alloc(net, PF_IEEE802154, GFP_KERNEL, proto, kern);
1034 if (!sk)
1035 goto out;
1036 rc = 0;
1037
1038 sock->ops = ops;
1039
1040 sock_init_data(sock, sk);
1041 sk->sk_destruct = ieee802154_sock_destruct;
1042 sk->sk_family = PF_IEEE802154;
1043
1044 /* Checksums on by default */
1045 sock_set_flag(sk, SOCK_ZAPPED);
1046
1047 if (sk->sk_prot->hash) {
1048 rc = sk->sk_prot->hash(sk);
1049 if (rc) {
1050 sk_common_release(sk);
1051 goto out;
1052 }
1053 }
1054
1055 if (sk->sk_prot->init) {
1056 rc = sk->sk_prot->init(sk);
1057 if (rc)
1058 sk_common_release(sk);
1059 }
1060 out:
1061 return rc;
1062 }
1063
1064 static const struct net_proto_family ieee802154_family_ops = {
1065 .family = PF_IEEE802154,
1066 .create = ieee802154_create,
1067 .owner = THIS_MODULE,
1068 };
1069
ieee802154_rcv(struct sk_buff * skb,struct net_device * dev,struct packet_type * pt,struct net_device * orig_dev)1070 static int ieee802154_rcv(struct sk_buff *skb, struct net_device *dev,
1071 struct packet_type *pt, struct net_device *orig_dev)
1072 {
1073 if (!netif_running(dev))
1074 goto drop;
1075 pr_debug("got frame, type %d, dev %p\n", dev->type, dev);
1076 #ifdef DEBUG
1077 print_hex_dump_bytes("ieee802154_rcv ",
1078 DUMP_PREFIX_NONE, skb->data, skb->len);
1079 #endif
1080
1081 if (!net_eq(dev_net(dev), &init_net))
1082 goto drop;
1083
1084 ieee802154_raw_deliver(dev, skb);
1085
1086 if (dev->type != ARPHRD_IEEE802154)
1087 goto drop;
1088
1089 if (skb->pkt_type != PACKET_OTHERHOST)
1090 return ieee802154_dgram_deliver(dev, skb);
1091
1092 drop:
1093 kfree_skb(skb);
1094 return NET_RX_DROP;
1095 }
1096
1097 static struct packet_type ieee802154_packet_type = {
1098 .type = htons(ETH_P_IEEE802154),
1099 .func = ieee802154_rcv,
1100 };
1101
af_ieee802154_init(void)1102 static int __init af_ieee802154_init(void)
1103 {
1104 int rc;
1105
1106 rc = proto_register(&ieee802154_raw_prot, 1);
1107 if (rc)
1108 goto out;
1109
1110 rc = proto_register(&ieee802154_dgram_prot, 1);
1111 if (rc)
1112 goto err_dgram;
1113
1114 /* Tell SOCKET that we are alive */
1115 rc = sock_register(&ieee802154_family_ops);
1116 if (rc)
1117 goto err_sock;
1118 dev_add_pack(&ieee802154_packet_type);
1119
1120 rc = 0;
1121 goto out;
1122
1123 err_sock:
1124 proto_unregister(&ieee802154_dgram_prot);
1125 err_dgram:
1126 proto_unregister(&ieee802154_raw_prot);
1127 out:
1128 return rc;
1129 }
1130
af_ieee802154_remove(void)1131 static void __exit af_ieee802154_remove(void)
1132 {
1133 dev_remove_pack(&ieee802154_packet_type);
1134 sock_unregister(PF_IEEE802154);
1135 proto_unregister(&ieee802154_dgram_prot);
1136 proto_unregister(&ieee802154_raw_prot);
1137 }
1138
1139 module_init(af_ieee802154_init);
1140 module_exit(af_ieee802154_remove);
1141
1142 MODULE_LICENSE("GPL");
1143 MODULE_ALIAS_NETPROTO(PF_IEEE802154);
1144