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_ALIAS_NETPROTO(PF_IEEE802154);
1141