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 if (dev)
45 dev_hold(dev);
46 rcu_read_unlock();
47 break;
48 case IEEE802154_ADDR_SHORT:
49 if (addr->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST) ||
50 addr->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
51 addr->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST))
52 break;
53
54 rtnl_lock();
55
56 for_each_netdev(net, tmp) {
57 if (tmp->type != ARPHRD_IEEE802154)
58 continue;
59
60 pan_id = tmp->ieee802154_ptr->pan_id;
61 short_addr = tmp->ieee802154_ptr->short_addr;
62 if (pan_id == addr->pan_id &&
63 short_addr == addr->short_addr) {
64 dev = tmp;
65 dev_hold(dev);
66 break;
67 }
68 }
69
70 rtnl_unlock();
71 break;
72 default:
73 pr_warn("Unsupported ieee802154 address type: %d\n",
74 addr->mode);
75 break;
76 }
77
78 return dev;
79 }
80
ieee802154_sock_release(struct socket * sock)81 static int ieee802154_sock_release(struct socket *sock)
82 {
83 struct sock *sk = sock->sk;
84
85 if (sk) {
86 sock->sk = NULL;
87 sk->sk_prot->close(sk, 0);
88 }
89 return 0;
90 }
91
ieee802154_sock_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)92 static int ieee802154_sock_sendmsg(struct socket *sock, struct msghdr *msg,
93 size_t len)
94 {
95 struct sock *sk = sock->sk;
96
97 return sk->sk_prot->sendmsg(sk, msg, len);
98 }
99
ieee802154_sock_bind(struct socket * sock,struct sockaddr * uaddr,int addr_len)100 static int ieee802154_sock_bind(struct socket *sock, struct sockaddr *uaddr,
101 int addr_len)
102 {
103 struct sock *sk = sock->sk;
104
105 if (sk->sk_prot->bind)
106 return sk->sk_prot->bind(sk, uaddr, addr_len);
107
108 return sock_no_bind(sock, uaddr, addr_len);
109 }
110
ieee802154_sock_connect(struct socket * sock,struct sockaddr * uaddr,int addr_len,int flags)111 static int ieee802154_sock_connect(struct socket *sock, struct sockaddr *uaddr,
112 int addr_len, int flags)
113 {
114 struct sock *sk = sock->sk;
115
116 if (addr_len < sizeof(uaddr->sa_family))
117 return -EINVAL;
118
119 if (uaddr->sa_family == AF_UNSPEC)
120 return sk->sk_prot->disconnect(sk, flags);
121
122 return sk->sk_prot->connect(sk, uaddr, addr_len);
123 }
124
ieee802154_dev_ioctl(struct sock * sk,struct ifreq __user * arg,unsigned int cmd)125 static int ieee802154_dev_ioctl(struct sock *sk, struct ifreq __user *arg,
126 unsigned int cmd)
127 {
128 struct ifreq ifr;
129 int ret = -ENOIOCTLCMD;
130 struct net_device *dev;
131
132 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
133 return -EFAULT;
134
135 ifr.ifr_name[IFNAMSIZ-1] = 0;
136
137 dev_load(sock_net(sk), ifr.ifr_name);
138 dev = dev_get_by_name(sock_net(sk), ifr.ifr_name);
139
140 if (!dev)
141 return -ENODEV;
142
143 if (dev->type == ARPHRD_IEEE802154 && dev->netdev_ops->ndo_do_ioctl)
144 ret = dev->netdev_ops->ndo_do_ioctl(dev, &ifr, cmd);
145
146 if (!ret && copy_to_user(arg, &ifr, sizeof(struct ifreq)))
147 ret = -EFAULT;
148 dev_put(dev);
149
150 return ret;
151 }
152
ieee802154_sock_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)153 static int ieee802154_sock_ioctl(struct socket *sock, unsigned int cmd,
154 unsigned long arg)
155 {
156 struct sock *sk = sock->sk;
157
158 switch (cmd) {
159 case SIOCGIFADDR:
160 case SIOCSIFADDR:
161 return ieee802154_dev_ioctl(sk, (struct ifreq __user *)arg,
162 cmd);
163 default:
164 if (!sk->sk_prot->ioctl)
165 return -ENOIOCTLCMD;
166 return sk->sk_prot->ioctl(sk, cmd, arg);
167 }
168 }
169
170 /* RAW Sockets (802.15.4 created in userspace) */
171 static HLIST_HEAD(raw_head);
172 static DEFINE_RWLOCK(raw_lock);
173
raw_hash(struct sock * sk)174 static int raw_hash(struct sock *sk)
175 {
176 write_lock_bh(&raw_lock);
177 sk_add_node(sk, &raw_head);
178 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
179 write_unlock_bh(&raw_lock);
180
181 return 0;
182 }
183
raw_unhash(struct sock * sk)184 static void raw_unhash(struct sock *sk)
185 {
186 write_lock_bh(&raw_lock);
187 if (sk_del_node_init(sk))
188 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
189 write_unlock_bh(&raw_lock);
190 }
191
raw_close(struct sock * sk,long timeout)192 static void raw_close(struct sock *sk, long timeout)
193 {
194 sk_common_release(sk);
195 }
196
raw_bind(struct sock * sk,struct sockaddr * _uaddr,int len)197 static int raw_bind(struct sock *sk, struct sockaddr *_uaddr, int len)
198 {
199 struct ieee802154_addr addr;
200 struct sockaddr_ieee802154 *uaddr = (struct sockaddr_ieee802154 *)_uaddr;
201 int err = 0;
202 struct net_device *dev = NULL;
203
204 err = ieee802154_sockaddr_check_size(uaddr, len);
205 if (err < 0)
206 return err;
207
208 uaddr = (struct sockaddr_ieee802154 *)_uaddr;
209 if (uaddr->family != AF_IEEE802154)
210 return -EINVAL;
211
212 lock_sock(sk);
213
214 ieee802154_addr_from_sa(&addr, &uaddr->addr);
215 dev = ieee802154_get_dev(sock_net(sk), &addr);
216 if (!dev) {
217 err = -ENODEV;
218 goto out;
219 }
220
221 sk->sk_bound_dev_if = dev->ifindex;
222 sk_dst_reset(sk);
223
224 dev_put(dev);
225 out:
226 release_sock(sk);
227
228 return err;
229 }
230
raw_connect(struct sock * sk,struct sockaddr * uaddr,int addr_len)231 static int raw_connect(struct sock *sk, struct sockaddr *uaddr,
232 int addr_len)
233 {
234 return -ENOTSUPP;
235 }
236
raw_disconnect(struct sock * sk,int flags)237 static int raw_disconnect(struct sock *sk, int flags)
238 {
239 return 0;
240 }
241
raw_sendmsg(struct sock * sk,struct msghdr * msg,size_t size)242 static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
243 {
244 struct net_device *dev;
245 unsigned int mtu;
246 struct sk_buff *skb;
247 int hlen, tlen;
248 int err;
249
250 if (msg->msg_flags & MSG_OOB) {
251 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
252 return -EOPNOTSUPP;
253 }
254
255 lock_sock(sk);
256 if (!sk->sk_bound_dev_if)
257 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
258 else
259 dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if);
260 release_sock(sk);
261
262 if (!dev) {
263 pr_debug("no dev\n");
264 err = -ENXIO;
265 goto out;
266 }
267
268 mtu = IEEE802154_MTU;
269 pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
270
271 if (size > mtu) {
272 pr_debug("size = %zu, mtu = %u\n", size, mtu);
273 err = -EMSGSIZE;
274 goto out_dev;
275 }
276 if (!size) {
277 err = 0;
278 goto out_dev;
279 }
280
281 hlen = LL_RESERVED_SPACE(dev);
282 tlen = dev->needed_tailroom;
283 skb = sock_alloc_send_skb(sk, hlen + tlen + size,
284 msg->msg_flags & MSG_DONTWAIT, &err);
285 if (!skb)
286 goto out_dev;
287
288 skb_reserve(skb, hlen);
289
290 skb_reset_mac_header(skb);
291 skb_reset_network_header(skb);
292
293 err = memcpy_from_msg(skb_put(skb, size), msg, size);
294 if (err < 0)
295 goto out_skb;
296
297 skb->dev = dev;
298 skb->protocol = htons(ETH_P_IEEE802154);
299
300 err = dev_queue_xmit(skb);
301 if (err > 0)
302 err = net_xmit_errno(err);
303
304 dev_put(dev);
305
306 return err ?: size;
307
308 out_skb:
309 kfree_skb(skb);
310 out_dev:
311 dev_put(dev);
312 out:
313 return err;
314 }
315
raw_recvmsg(struct sock * sk,struct msghdr * msg,size_t len,int noblock,int flags,int * addr_len)316 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
317 int noblock, int flags, int *addr_len)
318 {
319 size_t copied = 0;
320 int err = -EOPNOTSUPP;
321 struct sk_buff *skb;
322
323 skb = skb_recv_datagram(sk, flags, noblock, &err);
324 if (!skb)
325 goto out;
326
327 copied = skb->len;
328 if (len < copied) {
329 msg->msg_flags |= MSG_TRUNC;
330 copied = len;
331 }
332
333 err = skb_copy_datagram_msg(skb, 0, msg, copied);
334 if (err)
335 goto done;
336
337 sock_recv_ts_and_drops(msg, sk, skb);
338
339 if (flags & MSG_TRUNC)
340 copied = skb->len;
341 done:
342 skb_free_datagram(sk, skb);
343 out:
344 if (err)
345 return err;
346 return copied;
347 }
348
raw_rcv_skb(struct sock * sk,struct sk_buff * skb)349 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
350 {
351 skb = skb_share_check(skb, GFP_ATOMIC);
352 if (!skb)
353 return NET_RX_DROP;
354
355 if (sock_queue_rcv_skb(sk, skb) < 0) {
356 kfree_skb(skb);
357 return NET_RX_DROP;
358 }
359
360 return NET_RX_SUCCESS;
361 }
362
ieee802154_raw_deliver(struct net_device * dev,struct sk_buff * skb)363 static void ieee802154_raw_deliver(struct net_device *dev, struct sk_buff *skb)
364 {
365 struct sock *sk;
366
367 read_lock(&raw_lock);
368 sk_for_each(sk, &raw_head) {
369 bh_lock_sock(sk);
370 if (!sk->sk_bound_dev_if ||
371 sk->sk_bound_dev_if == dev->ifindex) {
372 struct sk_buff *clone;
373
374 clone = skb_clone(skb, GFP_ATOMIC);
375 if (clone)
376 raw_rcv_skb(sk, clone);
377 }
378 bh_unlock_sock(sk);
379 }
380 read_unlock(&raw_lock);
381 }
382
raw_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen)383 static int raw_getsockopt(struct sock *sk, int level, int optname,
384 char __user *optval, int __user *optlen)
385 {
386 return -EOPNOTSUPP;
387 }
388
raw_setsockopt(struct sock * sk,int level,int optname,char __user * optval,unsigned int optlen)389 static int raw_setsockopt(struct sock *sk, int level, int optname,
390 char __user *optval, unsigned int optlen)
391 {
392 return -EOPNOTSUPP;
393 }
394
395 static struct proto ieee802154_raw_prot = {
396 .name = "IEEE-802.15.4-RAW",
397 .owner = THIS_MODULE,
398 .obj_size = sizeof(struct sock),
399 .close = raw_close,
400 .bind = raw_bind,
401 .sendmsg = raw_sendmsg,
402 .recvmsg = raw_recvmsg,
403 .hash = raw_hash,
404 .unhash = raw_unhash,
405 .connect = raw_connect,
406 .disconnect = raw_disconnect,
407 .getsockopt = raw_getsockopt,
408 .setsockopt = raw_setsockopt,
409 };
410
411 static const struct proto_ops ieee802154_raw_ops = {
412 .family = PF_IEEE802154,
413 .owner = THIS_MODULE,
414 .release = ieee802154_sock_release,
415 .bind = ieee802154_sock_bind,
416 .connect = ieee802154_sock_connect,
417 .socketpair = sock_no_socketpair,
418 .accept = sock_no_accept,
419 .getname = sock_no_getname,
420 .poll = datagram_poll,
421 .ioctl = ieee802154_sock_ioctl,
422 .gettstamp = sock_gettstamp,
423 .listen = sock_no_listen,
424 .shutdown = sock_no_shutdown,
425 .setsockopt = sock_common_setsockopt,
426 .getsockopt = sock_common_getsockopt,
427 .sendmsg = ieee802154_sock_sendmsg,
428 .recvmsg = sock_common_recvmsg,
429 .mmap = sock_no_mmap,
430 .sendpage = sock_no_sendpage,
431 #ifdef CONFIG_COMPAT
432 .compat_setsockopt = compat_sock_common_setsockopt,
433 .compat_getsockopt = compat_sock_common_getsockopt,
434 #endif
435 };
436
437 /* DGRAM Sockets (802.15.4 dataframes) */
438 static HLIST_HEAD(dgram_head);
439 static DEFINE_RWLOCK(dgram_lock);
440
441 struct dgram_sock {
442 struct sock sk;
443
444 struct ieee802154_addr src_addr;
445 struct ieee802154_addr dst_addr;
446
447 unsigned int bound:1;
448 unsigned int connected:1;
449 unsigned int want_ack:1;
450 unsigned int want_lqi:1;
451 unsigned int secen:1;
452 unsigned int secen_override:1;
453 unsigned int seclevel:3;
454 unsigned int seclevel_override:1;
455 };
456
dgram_sk(const struct sock * sk)457 static inline struct dgram_sock *dgram_sk(const struct sock *sk)
458 {
459 return container_of(sk, struct dgram_sock, sk);
460 }
461
dgram_hash(struct sock * sk)462 static int dgram_hash(struct sock *sk)
463 {
464 write_lock_bh(&dgram_lock);
465 sk_add_node(sk, &dgram_head);
466 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
467 write_unlock_bh(&dgram_lock);
468
469 return 0;
470 }
471
dgram_unhash(struct sock * sk)472 static void dgram_unhash(struct sock *sk)
473 {
474 write_lock_bh(&dgram_lock);
475 if (sk_del_node_init(sk))
476 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
477 write_unlock_bh(&dgram_lock);
478 }
479
dgram_init(struct sock * sk)480 static int dgram_init(struct sock *sk)
481 {
482 struct dgram_sock *ro = dgram_sk(sk);
483
484 ro->want_ack = 1;
485 ro->want_lqi = 0;
486 return 0;
487 }
488
dgram_close(struct sock * sk,long timeout)489 static void dgram_close(struct sock *sk, long timeout)
490 {
491 sk_common_release(sk);
492 }
493
dgram_bind(struct sock * sk,struct sockaddr * uaddr,int len)494 static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len)
495 {
496 struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
497 struct ieee802154_addr haddr;
498 struct dgram_sock *ro = dgram_sk(sk);
499 int err = -EINVAL;
500 struct net_device *dev;
501
502 lock_sock(sk);
503
504 ro->bound = 0;
505
506 err = ieee802154_sockaddr_check_size(addr, len);
507 if (err < 0)
508 goto out;
509
510 if (addr->family != AF_IEEE802154) {
511 err = -EINVAL;
512 goto out;
513 }
514
515 ieee802154_addr_from_sa(&haddr, &addr->addr);
516 dev = ieee802154_get_dev(sock_net(sk), &haddr);
517 if (!dev) {
518 err = -ENODEV;
519 goto out;
520 }
521
522 if (dev->type != ARPHRD_IEEE802154) {
523 err = -ENODEV;
524 goto out_put;
525 }
526
527 ro->src_addr = haddr;
528
529 ro->bound = 1;
530 err = 0;
531 out_put:
532 dev_put(dev);
533 out:
534 release_sock(sk);
535
536 return err;
537 }
538
dgram_ioctl(struct sock * sk,int cmd,unsigned long arg)539 static int dgram_ioctl(struct sock *sk, int cmd, unsigned long arg)
540 {
541 switch (cmd) {
542 case SIOCOUTQ:
543 {
544 int amount = sk_wmem_alloc_get(sk);
545
546 return put_user(amount, (int __user *)arg);
547 }
548
549 case SIOCINQ:
550 {
551 struct sk_buff *skb;
552 unsigned long amount;
553
554 amount = 0;
555 spin_lock_bh(&sk->sk_receive_queue.lock);
556 skb = skb_peek(&sk->sk_receive_queue);
557 if (skb) {
558 /* We will only return the amount
559 * of this packet since that is all
560 * that will be read.
561 */
562 amount = skb->len - ieee802154_hdr_length(skb);
563 }
564 spin_unlock_bh(&sk->sk_receive_queue.lock);
565 return put_user(amount, (int __user *)arg);
566 }
567 }
568
569 return -ENOIOCTLCMD;
570 }
571
572 /* FIXME: autobind */
dgram_connect(struct sock * sk,struct sockaddr * uaddr,int len)573 static int dgram_connect(struct sock *sk, struct sockaddr *uaddr,
574 int len)
575 {
576 struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
577 struct dgram_sock *ro = dgram_sk(sk);
578 int err = 0;
579
580 err = ieee802154_sockaddr_check_size(addr, len);
581 if (err < 0)
582 return err;
583
584 if (addr->family != AF_IEEE802154)
585 return -EINVAL;
586
587 lock_sock(sk);
588
589 if (!ro->bound) {
590 err = -ENETUNREACH;
591 goto out;
592 }
593
594 ieee802154_addr_from_sa(&ro->dst_addr, &addr->addr);
595 ro->connected = 1;
596
597 out:
598 release_sock(sk);
599 return err;
600 }
601
dgram_disconnect(struct sock * sk,int flags)602 static int dgram_disconnect(struct sock *sk, int flags)
603 {
604 struct dgram_sock *ro = dgram_sk(sk);
605
606 lock_sock(sk);
607 ro->connected = 0;
608 release_sock(sk);
609
610 return 0;
611 }
612
dgram_sendmsg(struct sock * sk,struct msghdr * msg,size_t size)613 static int dgram_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
614 {
615 struct net_device *dev;
616 unsigned int mtu;
617 struct sk_buff *skb;
618 struct ieee802154_mac_cb *cb;
619 struct dgram_sock *ro = dgram_sk(sk);
620 struct ieee802154_addr dst_addr;
621 DECLARE_SOCKADDR(struct sockaddr_ieee802154*, daddr, msg->msg_name);
622 int hlen, tlen;
623 int err;
624
625 if (msg->msg_flags & MSG_OOB) {
626 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
627 return -EOPNOTSUPP;
628 }
629
630 if (msg->msg_name) {
631 if (ro->connected)
632 return -EISCONN;
633 if (msg->msg_namelen < IEEE802154_MIN_NAMELEN)
634 return -EINVAL;
635 err = ieee802154_sockaddr_check_size(daddr, msg->msg_namelen);
636 if (err < 0)
637 return err;
638 ieee802154_addr_from_sa(&dst_addr, &daddr->addr);
639 } else {
640 if (!ro->connected)
641 return -EDESTADDRREQ;
642 dst_addr = ro->dst_addr;
643 }
644
645 if (!ro->bound)
646 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
647 else
648 dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr);
649
650 if (!dev) {
651 pr_debug("no dev\n");
652 err = -ENXIO;
653 goto out;
654 }
655 mtu = IEEE802154_MTU;
656 pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
657
658 if (size > mtu) {
659 pr_debug("size = %zu, mtu = %u\n", size, mtu);
660 err = -EMSGSIZE;
661 goto out_dev;
662 }
663
664 hlen = LL_RESERVED_SPACE(dev);
665 tlen = dev->needed_tailroom;
666 skb = sock_alloc_send_skb(sk, hlen + tlen + size,
667 msg->msg_flags & MSG_DONTWAIT,
668 &err);
669 if (!skb)
670 goto out_dev;
671
672 skb_reserve(skb, hlen);
673
674 skb_reset_network_header(skb);
675
676 cb = mac_cb_init(skb);
677 cb->type = IEEE802154_FC_TYPE_DATA;
678 cb->ackreq = ro->want_ack;
679 cb->secen = ro->secen;
680 cb->secen_override = ro->secen_override;
681 cb->seclevel = ro->seclevel;
682 cb->seclevel_override = ro->seclevel_override;
683
684 err = wpan_dev_hard_header(skb, dev, &dst_addr,
685 ro->bound ? &ro->src_addr : NULL, size);
686 if (err < 0)
687 goto out_skb;
688
689 err = memcpy_from_msg(skb_put(skb, size), msg, size);
690 if (err < 0)
691 goto out_skb;
692
693 skb->dev = dev;
694 skb->protocol = htons(ETH_P_IEEE802154);
695
696 err = dev_queue_xmit(skb);
697 if (err > 0)
698 err = net_xmit_errno(err);
699
700 dev_put(dev);
701
702 return err ?: size;
703
704 out_skb:
705 kfree_skb(skb);
706 out_dev:
707 dev_put(dev);
708 out:
709 return err;
710 }
711
dgram_recvmsg(struct sock * sk,struct msghdr * msg,size_t len,int noblock,int flags,int * addr_len)712 static int dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
713 int noblock, int flags, int *addr_len)
714 {
715 size_t copied = 0;
716 int err = -EOPNOTSUPP;
717 struct sk_buff *skb;
718 struct dgram_sock *ro = dgram_sk(sk);
719 DECLARE_SOCKADDR(struct sockaddr_ieee802154 *, saddr, msg->msg_name);
720
721 skb = skb_recv_datagram(sk, flags, noblock, &err);
722 if (!skb)
723 goto out;
724
725 copied = skb->len;
726 if (len < copied) {
727 msg->msg_flags |= MSG_TRUNC;
728 copied = len;
729 }
730
731 /* FIXME: skip headers if necessary ?! */
732 err = skb_copy_datagram_msg(skb, 0, msg, copied);
733 if (err)
734 goto done;
735
736 sock_recv_ts_and_drops(msg, sk, skb);
737
738 if (saddr) {
739 /* Clear the implicit padding in struct sockaddr_ieee802154
740 * (16 bits between 'family' and 'addr') and in struct
741 * ieee802154_addr_sa (16 bits at the end of the structure).
742 */
743 memset(saddr, 0, sizeof(*saddr));
744
745 saddr->family = AF_IEEE802154;
746 ieee802154_addr_to_sa(&saddr->addr, &mac_cb(skb)->source);
747 *addr_len = sizeof(*saddr);
748 }
749
750 if (ro->want_lqi) {
751 err = put_cmsg(msg, SOL_IEEE802154, WPAN_WANTLQI,
752 sizeof(uint8_t), &(mac_cb(skb)->lqi));
753 if (err)
754 goto done;
755 }
756
757 if (flags & MSG_TRUNC)
758 copied = skb->len;
759 done:
760 skb_free_datagram(sk, skb);
761 out:
762 if (err)
763 return err;
764 return copied;
765 }
766
dgram_rcv_skb(struct sock * sk,struct sk_buff * skb)767 static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb)
768 {
769 skb = skb_share_check(skb, GFP_ATOMIC);
770 if (!skb)
771 return NET_RX_DROP;
772
773 if (sock_queue_rcv_skb(sk, skb) < 0) {
774 kfree_skb(skb);
775 return NET_RX_DROP;
776 }
777
778 return NET_RX_SUCCESS;
779 }
780
781 static inline bool
ieee802154_match_sock(__le64 hw_addr,__le16 pan_id,__le16 short_addr,struct dgram_sock * ro)782 ieee802154_match_sock(__le64 hw_addr, __le16 pan_id, __le16 short_addr,
783 struct dgram_sock *ro)
784 {
785 if (!ro->bound)
786 return true;
787
788 if (ro->src_addr.mode == IEEE802154_ADDR_LONG &&
789 hw_addr == ro->src_addr.extended_addr)
790 return true;
791
792 if (ro->src_addr.mode == IEEE802154_ADDR_SHORT &&
793 pan_id == ro->src_addr.pan_id &&
794 short_addr == ro->src_addr.short_addr)
795 return true;
796
797 return false;
798 }
799
ieee802154_dgram_deliver(struct net_device * dev,struct sk_buff * skb)800 static int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb)
801 {
802 struct sock *sk, *prev = NULL;
803 int ret = NET_RX_SUCCESS;
804 __le16 pan_id, short_addr;
805 __le64 hw_addr;
806
807 /* Data frame processing */
808 BUG_ON(dev->type != ARPHRD_IEEE802154);
809
810 pan_id = dev->ieee802154_ptr->pan_id;
811 short_addr = dev->ieee802154_ptr->short_addr;
812 hw_addr = dev->ieee802154_ptr->extended_addr;
813
814 read_lock(&dgram_lock);
815 sk_for_each(sk, &dgram_head) {
816 if (ieee802154_match_sock(hw_addr, pan_id, short_addr,
817 dgram_sk(sk))) {
818 if (prev) {
819 struct sk_buff *clone;
820
821 clone = skb_clone(skb, GFP_ATOMIC);
822 if (clone)
823 dgram_rcv_skb(prev, clone);
824 }
825
826 prev = sk;
827 }
828 }
829
830 if (prev) {
831 dgram_rcv_skb(prev, skb);
832 } else {
833 kfree_skb(skb);
834 ret = NET_RX_DROP;
835 }
836 read_unlock(&dgram_lock);
837
838 return ret;
839 }
840
dgram_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen)841 static int dgram_getsockopt(struct sock *sk, int level, int optname,
842 char __user *optval, int __user *optlen)
843 {
844 struct dgram_sock *ro = dgram_sk(sk);
845
846 int val, len;
847
848 if (level != SOL_IEEE802154)
849 return -EOPNOTSUPP;
850
851 if (get_user(len, optlen))
852 return -EFAULT;
853
854 len = min_t(unsigned int, len, sizeof(int));
855
856 switch (optname) {
857 case WPAN_WANTACK:
858 val = ro->want_ack;
859 break;
860 case WPAN_WANTLQI:
861 val = ro->want_lqi;
862 break;
863 case WPAN_SECURITY:
864 if (!ro->secen_override)
865 val = WPAN_SECURITY_DEFAULT;
866 else if (ro->secen)
867 val = WPAN_SECURITY_ON;
868 else
869 val = WPAN_SECURITY_OFF;
870 break;
871 case WPAN_SECURITY_LEVEL:
872 if (!ro->seclevel_override)
873 val = WPAN_SECURITY_LEVEL_DEFAULT;
874 else
875 val = ro->seclevel;
876 break;
877 default:
878 return -ENOPROTOOPT;
879 }
880
881 if (put_user(len, optlen))
882 return -EFAULT;
883 if (copy_to_user(optval, &val, len))
884 return -EFAULT;
885 return 0;
886 }
887
dgram_setsockopt(struct sock * sk,int level,int optname,char __user * optval,unsigned int optlen)888 static int dgram_setsockopt(struct sock *sk, int level, int optname,
889 char __user *optval, unsigned int optlen)
890 {
891 struct dgram_sock *ro = dgram_sk(sk);
892 struct net *net = sock_net(sk);
893 int val;
894 int err = 0;
895
896 if (optlen < sizeof(int))
897 return -EINVAL;
898
899 if (get_user(val, (int __user *)optval))
900 return -EFAULT;
901
902 lock_sock(sk);
903
904 switch (optname) {
905 case WPAN_WANTACK:
906 ro->want_ack = !!val;
907 break;
908 case WPAN_WANTLQI:
909 ro->want_lqi = !!val;
910 break;
911 case WPAN_SECURITY:
912 if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
913 !ns_capable(net->user_ns, CAP_NET_RAW)) {
914 err = -EPERM;
915 break;
916 }
917
918 switch (val) {
919 case WPAN_SECURITY_DEFAULT:
920 ro->secen_override = 0;
921 break;
922 case WPAN_SECURITY_ON:
923 ro->secen_override = 1;
924 ro->secen = 1;
925 break;
926 case WPAN_SECURITY_OFF:
927 ro->secen_override = 1;
928 ro->secen = 0;
929 break;
930 default:
931 err = -EINVAL;
932 break;
933 }
934 break;
935 case WPAN_SECURITY_LEVEL:
936 if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
937 !ns_capable(net->user_ns, CAP_NET_RAW)) {
938 err = -EPERM;
939 break;
940 }
941
942 if (val < WPAN_SECURITY_LEVEL_DEFAULT ||
943 val > IEEE802154_SCF_SECLEVEL_ENC_MIC128) {
944 err = -EINVAL;
945 } else if (val == WPAN_SECURITY_LEVEL_DEFAULT) {
946 ro->seclevel_override = 0;
947 } else {
948 ro->seclevel_override = 1;
949 ro->seclevel = val;
950 }
951 break;
952 default:
953 err = -ENOPROTOOPT;
954 break;
955 }
956
957 release_sock(sk);
958 return err;
959 }
960
961 static struct proto ieee802154_dgram_prot = {
962 .name = "IEEE-802.15.4-MAC",
963 .owner = THIS_MODULE,
964 .obj_size = sizeof(struct dgram_sock),
965 .init = dgram_init,
966 .close = dgram_close,
967 .bind = dgram_bind,
968 .sendmsg = dgram_sendmsg,
969 .recvmsg = dgram_recvmsg,
970 .hash = dgram_hash,
971 .unhash = dgram_unhash,
972 .connect = dgram_connect,
973 .disconnect = dgram_disconnect,
974 .ioctl = dgram_ioctl,
975 .getsockopt = dgram_getsockopt,
976 .setsockopt = dgram_setsockopt,
977 };
978
979 static const struct proto_ops ieee802154_dgram_ops = {
980 .family = PF_IEEE802154,
981 .owner = THIS_MODULE,
982 .release = ieee802154_sock_release,
983 .bind = ieee802154_sock_bind,
984 .connect = ieee802154_sock_connect,
985 .socketpair = sock_no_socketpair,
986 .accept = sock_no_accept,
987 .getname = sock_no_getname,
988 .poll = datagram_poll,
989 .ioctl = ieee802154_sock_ioctl,
990 .gettstamp = sock_gettstamp,
991 .listen = sock_no_listen,
992 .shutdown = sock_no_shutdown,
993 .setsockopt = sock_common_setsockopt,
994 .getsockopt = sock_common_getsockopt,
995 .sendmsg = ieee802154_sock_sendmsg,
996 .recvmsg = sock_common_recvmsg,
997 .mmap = sock_no_mmap,
998 .sendpage = sock_no_sendpage,
999 #ifdef CONFIG_COMPAT
1000 .compat_setsockopt = compat_sock_common_setsockopt,
1001 .compat_getsockopt = compat_sock_common_getsockopt,
1002 #endif
1003 };
1004
ieee802154_sock_destruct(struct sock * sk)1005 static void ieee802154_sock_destruct(struct sock *sk)
1006 {
1007 skb_queue_purge(&sk->sk_receive_queue);
1008 }
1009
1010 /* Create a socket. Initialise the socket, blank the addresses
1011 * set the state.
1012 */
ieee802154_create(struct net * net,struct socket * sock,int protocol,int kern)1013 static int ieee802154_create(struct net *net, struct socket *sock,
1014 int protocol, int kern)
1015 {
1016 struct sock *sk;
1017 int rc;
1018 struct proto *proto;
1019 const struct proto_ops *ops;
1020
1021 if (!net_eq(net, &init_net))
1022 return -EAFNOSUPPORT;
1023
1024 switch (sock->type) {
1025 case SOCK_RAW:
1026 rc = -EPERM;
1027 if (!capable(CAP_NET_RAW))
1028 goto out;
1029 proto = &ieee802154_raw_prot;
1030 ops = &ieee802154_raw_ops;
1031 break;
1032 case SOCK_DGRAM:
1033 proto = &ieee802154_dgram_prot;
1034 ops = &ieee802154_dgram_ops;
1035 break;
1036 default:
1037 rc = -ESOCKTNOSUPPORT;
1038 goto out;
1039 }
1040
1041 rc = -ENOMEM;
1042 sk = sk_alloc(net, PF_IEEE802154, GFP_KERNEL, proto, kern);
1043 if (!sk)
1044 goto out;
1045 rc = 0;
1046
1047 sock->ops = ops;
1048
1049 sock_init_data(sock, sk);
1050 sk->sk_destruct = ieee802154_sock_destruct;
1051 sk->sk_family = PF_IEEE802154;
1052
1053 /* Checksums on by default */
1054 sock_set_flag(sk, SOCK_ZAPPED);
1055
1056 if (sk->sk_prot->hash) {
1057 rc = sk->sk_prot->hash(sk);
1058 if (rc) {
1059 sk_common_release(sk);
1060 goto out;
1061 }
1062 }
1063
1064 if (sk->sk_prot->init) {
1065 rc = sk->sk_prot->init(sk);
1066 if (rc)
1067 sk_common_release(sk);
1068 }
1069 out:
1070 return rc;
1071 }
1072
1073 static const struct net_proto_family ieee802154_family_ops = {
1074 .family = PF_IEEE802154,
1075 .create = ieee802154_create,
1076 .owner = THIS_MODULE,
1077 };
1078
ieee802154_rcv(struct sk_buff * skb,struct net_device * dev,struct packet_type * pt,struct net_device * orig_dev)1079 static int ieee802154_rcv(struct sk_buff *skb, struct net_device *dev,
1080 struct packet_type *pt, struct net_device *orig_dev)
1081 {
1082 if (!netif_running(dev))
1083 goto drop;
1084 pr_debug("got frame, type %d, dev %p\n", dev->type, dev);
1085 #ifdef DEBUG
1086 print_hex_dump_bytes("ieee802154_rcv ",
1087 DUMP_PREFIX_NONE, skb->data, skb->len);
1088 #endif
1089
1090 if (!net_eq(dev_net(dev), &init_net))
1091 goto drop;
1092
1093 ieee802154_raw_deliver(dev, skb);
1094
1095 if (dev->type != ARPHRD_IEEE802154)
1096 goto drop;
1097
1098 if (skb->pkt_type != PACKET_OTHERHOST)
1099 return ieee802154_dgram_deliver(dev, skb);
1100
1101 drop:
1102 kfree_skb(skb);
1103 return NET_RX_DROP;
1104 }
1105
1106 static struct packet_type ieee802154_packet_type = {
1107 .type = htons(ETH_P_IEEE802154),
1108 .func = ieee802154_rcv,
1109 };
1110
af_ieee802154_init(void)1111 static int __init af_ieee802154_init(void)
1112 {
1113 int rc;
1114
1115 rc = proto_register(&ieee802154_raw_prot, 1);
1116 if (rc)
1117 goto out;
1118
1119 rc = proto_register(&ieee802154_dgram_prot, 1);
1120 if (rc)
1121 goto err_dgram;
1122
1123 /* Tell SOCKET that we are alive */
1124 rc = sock_register(&ieee802154_family_ops);
1125 if (rc)
1126 goto err_sock;
1127 dev_add_pack(&ieee802154_packet_type);
1128
1129 rc = 0;
1130 goto out;
1131
1132 err_sock:
1133 proto_unregister(&ieee802154_dgram_prot);
1134 err_dgram:
1135 proto_unregister(&ieee802154_raw_prot);
1136 out:
1137 return rc;
1138 }
1139
af_ieee802154_remove(void)1140 static void __exit af_ieee802154_remove(void)
1141 {
1142 dev_remove_pack(&ieee802154_packet_type);
1143 sock_unregister(PF_IEEE802154);
1144 proto_unregister(&ieee802154_dgram_prot);
1145 proto_unregister(&ieee802154_raw_prot);
1146 }
1147
1148 module_init(af_ieee802154_init);
1149 module_exit(af_ieee802154_remove);
1150
1151 MODULE_LICENSE("GPL");
1152 MODULE_ALIAS_NETPROTO(PF_IEEE802154);
1153