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Merge tag 'xfs-for-linus-4.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-block.git] / net / ieee802154 / socket.c
CommitLineData
9ec76716
SL		 1/*
2 * IEEE802154.4 socket interface
3 *
4 * Copyright 2007, 2008 Siemens AG
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
9ec76716
SL		 15 * Written by:
16 * Sergey Lapin <slapin@ossfans.org>
17 * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
18 */
19
20#include <linux/net.h>
21#include <linux/capability.h>
22#include <linux/module.h>
23#include <linux/if_arp.h>
24#include <linux/if.h>
25#include <linux/termios.h> /* For TIOCOUTQ/INQ */
26#include <linux/list.h>
5a0e3ad6 27#include <linux/slab.h>
9ec76716
SL		 28#include <net/datalink.h>
29#include <net/psnap.h>
30#include <net/sock.h>
31#include <net/tcp_states.h>
32#include <net/route.h>
33
f0166e5e
DES		 34#include <net/af_ieee802154.h>
35#include <net/ieee802154_netdev.h>
9ec76716 36
4710d806 37/* Utility function for families */
78f821b6 38static struct net_device*
e6278d92 39ieee802154_get_dev(struct net *net, const struct ieee802154_addr *addr)
9ec76716
SL		 40{
41 struct net_device *dev = NULL;
42 struct net_device *tmp;
b70ab2e8 43 __le16 pan_id, short_addr;
e6278d92 44 u8 hwaddr[IEEE802154_ADDR_LEN];
9ec76716 45
e6278d92 46 switch (addr->mode) {
9ec76716 47 case IEEE802154_ADDR_LONG:
e6278d92 48 ieee802154_devaddr_to_raw(hwaddr, addr->extended_addr);
941666c2 49 rcu_read_lock();
e6278d92 50 dev = dev_getbyhwaddr_rcu(net, ARPHRD_IEEE802154, hwaddr);
9ec76716
SL		 51 if (dev)
52 dev_hold(dev);
941666c2 53 rcu_read_unlock();
9ec76716
SL		 54 break;
55 case IEEE802154_ADDR_SHORT:
e6278d92
PB		 56 if (addr->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST) ||
57 addr->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
06324f2f 58 addr->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST))
9ec76716
SL		 59 break;
60
61 rtnl_lock();
62
63 for_each_netdev(net, tmp) {
64 if (tmp->type != ARPHRD_IEEE802154)
65 continue;
66
67 pan_id = ieee802154_mlme_ops(tmp)->get_pan_id(tmp);
68 short_addr =
69 ieee802154_mlme_ops(tmp)->get_short_addr(tmp);
70
e6278d92
PB		 71 if (pan_id == addr->pan_id &&
72 short_addr == addr->short_addr) {
9ec76716
SL		 73 dev = tmp;
74 dev_hold(dev);
75 break;
76 }
77 }
78
79 rtnl_unlock();
80 break;
81 default:
4710d806
VB		 82 pr_warn("Unsupported ieee802154 address type: %d\n",
83 addr->mode);
9ec76716
SL		 84 break;
85 }
86
87 return dev;
88}
89
90static int ieee802154_sock_release(struct socket *sock)
91{
92 struct sock *sk = sock->sk;
93
94 if (sk) {
95 sock->sk = NULL;
96 sk->sk_prot->close(sk, 0);
97 }
98 return 0;
99}
6c10dc05 100
1b784140
YX		 101static int ieee802154_sock_sendmsg(struct socket *sock, struct msghdr *msg,
102 size_t len)
9ec76716
SL		 103{
104 struct sock *sk = sock->sk;
105
1b784140 106 return sk->sk_prot->sendmsg(sk, msg, len);
9ec76716
SL		 107}
108
109static int ieee802154_sock_bind(struct socket *sock, struct sockaddr *uaddr,
4710d806 110 int addr_len)
9ec76716
SL		 111{
112 struct sock *sk = sock->sk;
113
114 if (sk->sk_prot->bind)
115 return sk->sk_prot->bind(sk, uaddr, addr_len);
116
117 return sock_no_bind(sock, uaddr, addr_len);
118}
119
120static int ieee802154_sock_connect(struct socket *sock, struct sockaddr *uaddr,
4710d806 121 int addr_len, int flags)
9ec76716
SL		 122{
123 struct sock *sk = sock->sk;
124
6503d961
CG		 125 if (addr_len < sizeof(uaddr->sa_family))
126 return -EINVAL;
127
9ec76716
SL		 128 if (uaddr->sa_family == AF_UNSPEC)
129 return sk->sk_prot->disconnect(sk, flags);
130
131 return sk->sk_prot->connect(sk, uaddr, addr_len);
132}
133
134static int ieee802154_dev_ioctl(struct sock *sk, struct ifreq __user *arg,
4710d806 135 unsigned int cmd)
9ec76716
SL		 136{
137 struct ifreq ifr;
45a41d14 138 int ret = -ENOIOCTLCMD;
9ec76716
SL		 139 struct net_device *dev;
140
141 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
142 return -EFAULT;
143
144 ifr.ifr_name[IFNAMSIZ-1] = 0;
145
146 dev_load(sock_net(sk), ifr.ifr_name);
147 dev = dev_get_by_name(sock_net(sk), ifr.ifr_name);
45a41d14 148
93c0c8b4
SS		 149 if (!dev)
150 return -ENODEV;
151
929122cd 152 if (dev->type == ARPHRD_IEEE802154 && dev->netdev_ops->ndo_do_ioctl)
9ec76716
SL		 153 ret = dev->netdev_ops->ndo_do_ioctl(dev, &ifr, cmd);
154
155 if (!ret && copy_to_user(arg, &ifr, sizeof(struct ifreq)))
156 ret = -EFAULT;
157 dev_put(dev);
158
159 return ret;
160}
161
162static int ieee802154_sock_ioctl(struct socket *sock, unsigned int cmd,
4710d806 163 unsigned long arg)
9ec76716
SL		 164{
165 struct sock *sk = sock->sk;
166
167 switch (cmd) {
168 case SIOCGSTAMP:
169 return sock_get_timestamp(sk, (struct timeval __user *)arg);
170 case SIOCGSTAMPNS:
171 return sock_get_timestampns(sk, (struct timespec __user *)arg);
172 case SIOCGIFADDR:
173 case SIOCSIFADDR:
174 return ieee802154_dev_ioctl(sk, (struct ifreq __user *)arg,
175 cmd);
176 default:
177 if (!sk->sk_prot->ioctl)
178 return -ENOIOCTLCMD;
179 return sk->sk_prot->ioctl(sk, cmd, arg);
180 }
181}
182
78f821b6
AA		 183/* RAW Sockets (802.15.4 created in userspace) */
184static HLIST_HEAD(raw_head);
185static DEFINE_RWLOCK(raw_lock);
186
187static void raw_hash(struct sock *sk)
188{
189 write_lock_bh(&raw_lock);
190 sk_add_node(sk, &raw_head);
191 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
192 write_unlock_bh(&raw_lock);
193}
194
195static void raw_unhash(struct sock *sk)
196{
197 write_lock_bh(&raw_lock);
198 if (sk_del_node_init(sk))
199 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
200 write_unlock_bh(&raw_lock);
201}
202
203static void raw_close(struct sock *sk, long timeout)
204{
205 sk_common_release(sk);
206}
207
208static int raw_bind(struct sock *sk, struct sockaddr *_uaddr, int len)
209{
210 struct ieee802154_addr addr;
211 struct sockaddr_ieee802154 *uaddr = (struct sockaddr_ieee802154 *)_uaddr;
212 int err = 0;
213 struct net_device *dev = NULL;
214
215 if (len < sizeof(*uaddr))
216 return -EINVAL;
217
218 uaddr = (struct sockaddr_ieee802154 *)_uaddr;
219 if (uaddr->family != AF_IEEE802154)
220 return -EINVAL;
221
222 lock_sock(sk);
223
224 ieee802154_addr_from_sa(&addr, &uaddr->addr);
225 dev = ieee802154_get_dev(sock_net(sk), &addr);
226 if (!dev) {
227 err = -ENODEV;
228 goto out;
229 }
230
231 if (dev->type != ARPHRD_IEEE802154) {
232 err = -ENODEV;
233 goto out_put;
234 }
235
236 sk->sk_bound_dev_if = dev->ifindex;
237 sk_dst_reset(sk);
238
239out_put:
240 dev_put(dev);
241out:
242 release_sock(sk);
243
244 return err;
245}
246
247static int raw_connect(struct sock *sk, struct sockaddr *uaddr,
248 int addr_len)
249{
250 return -ENOTSUPP;
251}
252
253static int raw_disconnect(struct sock *sk, int flags)
254{
255 return 0;
256}
257
1b784140 258static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
78f821b6
AA		 259{
260 struct net_device *dev;
261 unsigned int mtu;
262 struct sk_buff *skb;
263 int hlen, tlen;
264 int err;
265
266 if (msg->msg_flags & MSG_OOB) {
267 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
268 return -EOPNOTSUPP;
269 }
270
271 lock_sock(sk);
272 if (!sk->sk_bound_dev_if)
273 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
274 else
275 dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if);
276 release_sock(sk);
277
278 if (!dev) {
279 pr_debug("no dev\n");
280 err = -ENXIO;
281 goto out;
282 }
283
284 mtu = dev->mtu;
285 pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
286
287 if (size > mtu) {
288 pr_debug("size = %Zu, mtu = %u\n", size, mtu);
289 err = -EINVAL;
290 goto out_dev;
291 }
292
293 hlen = LL_RESERVED_SPACE(dev);
294 tlen = dev->needed_tailroom;
295 skb = sock_alloc_send_skb(sk, hlen + tlen + size,
296 msg->msg_flags & MSG_DONTWAIT, &err);
297 if (!skb)
298 goto out_dev;
299
300 skb_reserve(skb, hlen);
301
302 skb_reset_mac_header(skb);
303 skb_reset_network_header(skb);
304
305 err = memcpy_from_msg(skb_put(skb, size), msg, size);
306 if (err < 0)
307 goto out_skb;
308
309 skb->dev = dev;
310 skb->sk = sk;
311 skb->protocol = htons(ETH_P_IEEE802154);
312
313 dev_put(dev);
314
315 err = dev_queue_xmit(skb);
316 if (err > 0)
317 err = net_xmit_errno(err);
318
319 return err ?: size;
320
321out_skb:
322 kfree_skb(skb);
323out_dev:
324 dev_put(dev);
325out:
326 return err;
327}
328
1b784140
YX		 329static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
330 int noblock, int flags, int *addr_len)
78f821b6
AA		 331{
332 size_t copied = 0;
333 int err = -EOPNOTSUPP;
334 struct sk_buff *skb;
335
336 skb = skb_recv_datagram(sk, flags, noblock, &err);
337 if (!skb)
338 goto out;
339
340 copied = skb->len;
341 if (len < copied) {
342 msg->msg_flags |= MSG_TRUNC;
343 copied = len;
344 }
345
346 err = skb_copy_datagram_msg(skb, 0, msg, copied);
347 if (err)
348 goto done;
349
350 sock_recv_ts_and_drops(msg, sk, skb);
351
352 if (flags & MSG_TRUNC)
353 copied = skb->len;
354done:
355 skb_free_datagram(sk, skb);
356out:
357 if (err)
358 return err;
359 return copied;
360}
361
362static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
363{
364 skb = skb_share_check(skb, GFP_ATOMIC);
365 if (!skb)
366 return NET_RX_DROP;
367
368 if (sock_queue_rcv_skb(sk, skb) < 0) {
369 kfree_skb(skb);
370 return NET_RX_DROP;
371 }
372
373 return NET_RX_SUCCESS;
374}
375
376static void ieee802154_raw_deliver(struct net_device *dev, struct sk_buff *skb)
377{
378 struct sock *sk;
379
380 read_lock(&raw_lock);
381 sk_for_each(sk, &raw_head) {
382 bh_lock_sock(sk);
383 if (!sk->sk_bound_dev_if ||
384 sk->sk_bound_dev_if == dev->ifindex) {
385 struct sk_buff *clone;
386
387 clone = skb_clone(skb, GFP_ATOMIC);
388 if (clone)
389 raw_rcv_skb(sk, clone);
390 }
391 bh_unlock_sock(sk);
392 }
393 read_unlock(&raw_lock);
394}
395
396static int raw_getsockopt(struct sock *sk, int level, int optname,
397 char __user *optval, int __user *optlen)
398{
399 return -EOPNOTSUPP;
400}
401
402static int raw_setsockopt(struct sock *sk, int level, int optname,
403 char __user *optval, unsigned int optlen)
404{
405 return -EOPNOTSUPP;
406}
407
408static struct proto ieee802154_raw_prot = {
409 .name = "IEEE-802.15.4-RAW",
410 .owner = THIS_MODULE,
411 .obj_size = sizeof(struct sock),
412 .close = raw_close,
413 .bind = raw_bind,
414 .sendmsg = raw_sendmsg,
415 .recvmsg = raw_recvmsg,
416 .hash = raw_hash,
417 .unhash = raw_unhash,
418 .connect = raw_connect,
419 .disconnect = raw_disconnect,
420 .getsockopt = raw_getsockopt,
421 .setsockopt = raw_setsockopt,
422};
423
9ec76716
SL		 424static const struct proto_ops ieee802154_raw_ops = {
425 .family = PF_IEEE802154,
426 .owner = THIS_MODULE,
427 .release = ieee802154_sock_release,
428 .bind = ieee802154_sock_bind,
429 .connect = ieee802154_sock_connect,
430 .socketpair = sock_no_socketpair,
431 .accept = sock_no_accept,
432 .getname = sock_no_getname,
433 .poll = datagram_poll,
434 .ioctl = ieee802154_sock_ioctl,
435 .listen = sock_no_listen,
436 .shutdown = sock_no_shutdown,
437 .setsockopt = sock_common_setsockopt,
438 .getsockopt = sock_common_getsockopt,
439 .sendmsg = ieee802154_sock_sendmsg,
440 .recvmsg = sock_common_recvmsg,
441 .mmap = sock_no_mmap,
442 .sendpage = sock_no_sendpage,
443#ifdef CONFIG_COMPAT
444 .compat_setsockopt = compat_sock_common_setsockopt,
445 .compat_getsockopt = compat_sock_common_getsockopt,
446#endif
447};
448
78f821b6
AA		 449/* DGRAM Sockets (802.15.4 dataframes) */
450static HLIST_HEAD(dgram_head);
451static DEFINE_RWLOCK(dgram_lock);
452
453struct dgram_sock {
454 struct sock sk;
455
456 struct ieee802154_addr src_addr;
457 struct ieee802154_addr dst_addr;
458
459 unsigned int bound:1;
460 unsigned int connected:1;
461 unsigned int want_ack:1;
462 unsigned int secen:1;
463 unsigned int secen_override:1;
464 unsigned int seclevel:3;
465 unsigned int seclevel_override:1;
466};
467
468static inline struct dgram_sock *dgram_sk(const struct sock *sk)
469{
470 return container_of(sk, struct dgram_sock, sk);
471}
472
473static void dgram_hash(struct sock *sk)
474{
475 write_lock_bh(&dgram_lock);
476 sk_add_node(sk, &dgram_head);
477 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
478 write_unlock_bh(&dgram_lock);
479}
480
481static void dgram_unhash(struct sock *sk)
482{
483 write_lock_bh(&dgram_lock);
484 if (sk_del_node_init(sk))
485 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
486 write_unlock_bh(&dgram_lock);
487}
488
489static int dgram_init(struct sock *sk)
490{
491 struct dgram_sock *ro = dgram_sk(sk);
492
493 ro->want_ack = 1;
494 return 0;
495}
496
497static void dgram_close(struct sock *sk, long timeout)
498{
499 sk_common_release(sk);
500}
501
502static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len)
503{
504 struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
505 struct ieee802154_addr haddr;
506 struct dgram_sock *ro = dgram_sk(sk);
507 int err = -EINVAL;
508 struct net_device *dev;
509
510 lock_sock(sk);
511
512 ro->bound = 0;
513
514 if (len < sizeof(*addr))
515 goto out;
516
517 if (addr->family != AF_IEEE802154)
518 goto out;
519
520 ieee802154_addr_from_sa(&haddr, &addr->addr);
521 dev = ieee802154_get_dev(sock_net(sk), &haddr);
522 if (!dev) {
523 err = -ENODEV;
524 goto out;
525 }
526
527 if (dev->type != ARPHRD_IEEE802154) {
528 err = -ENODEV;
529 goto out_put;
530 }
531
532 ro->src_addr = haddr;
533
534 ro->bound = 1;
535 err = 0;
536out_put:
537 dev_put(dev);
538out:
539 release_sock(sk);
540
541 return err;
542}
543
544static int dgram_ioctl(struct sock *sk, int cmd, unsigned long arg)
545{
546 switch (cmd) {
547 case SIOCOUTQ:
548 {
549 int amount = sk_wmem_alloc_get(sk);
550
551 return put_user(amount, (int __user *)arg);
552 }
553
554 case SIOCINQ:
555 {
556 struct sk_buff *skb;
557 unsigned long amount;
558
559 amount = 0;
560 spin_lock_bh(&sk->sk_receive_queue.lock);
561 skb = skb_peek(&sk->sk_receive_queue);
df2f65de 562 if (skb) {
78f821b6
AA		 563 /* We will only return the amount
564 * of this packet since that is all
565 * that will be read.
566 */
567 amount = skb->len - ieee802154_hdr_length(skb);
568 }
569 spin_unlock_bh(&sk->sk_receive_queue.lock);
570 return put_user(amount, (int __user *)arg);
571 }
572 }
573
574 return -ENOIOCTLCMD;
575}
576
577/* FIXME: autobind */
578static int dgram_connect(struct sock *sk, struct sockaddr *uaddr,
579 int len)
580{
581 struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
582 struct dgram_sock *ro = dgram_sk(sk);
583 int err = 0;
584
585 if (len < sizeof(*addr))
586 return -EINVAL;
587
588 if (addr->family != AF_IEEE802154)
589 return -EINVAL;
590
591 lock_sock(sk);
592
593 if (!ro->bound) {
594 err = -ENETUNREACH;
595 goto out;
596 }
597
598 ieee802154_addr_from_sa(&ro->dst_addr, &addr->addr);
599 ro->connected = 1;
600
601out:
602 release_sock(sk);
603 return err;
604}
605
606static int dgram_disconnect(struct sock *sk, int flags)
607{
608 struct dgram_sock *ro = dgram_sk(sk);
609
610 lock_sock(sk);
611 ro->connected = 0;
612 release_sock(sk);
613
614 return 0;
615}
616
1b784140 617static int dgram_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
78f821b6
AA		 618{
619 struct net_device *dev;
620 unsigned int mtu;
621 struct sk_buff *skb;
622 struct ieee802154_mac_cb *cb;
623 struct dgram_sock *ro = dgram_sk(sk);
624 struct ieee802154_addr dst_addr;
625 int hlen, tlen;
626 int err;
627
628 if (msg->msg_flags & MSG_OOB) {
629 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
630 return -EOPNOTSUPP;
631 }
632
633 if (!ro->connected && !msg->msg_name)
634 return -EDESTADDRREQ;
635 else if (ro->connected && msg->msg_name)
636 return -EISCONN;
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 = dev->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
673 if (msg->msg_name) {
674 DECLARE_SOCKADDR(struct sockaddr_ieee802154*,
675 daddr, msg->msg_name);
676
677 ieee802154_addr_from_sa(&dst_addr, &daddr->addr);
678 } else {
679 dst_addr = ro->dst_addr;
680 }
681
682 cb->secen = ro->secen;
683 cb->secen_override = ro->secen_override;
684 cb->seclevel = ro->seclevel;
685 cb->seclevel_override = ro->seclevel_override;
686
687 err = dev_hard_header(skb, dev, ETH_P_IEEE802154, &dst_addr,
688 ro->bound ? &ro->src_addr : NULL, size);
689 if (err < 0)
690 goto out_skb;
691
692 err = memcpy_from_msg(skb_put(skb, size), msg, size);
693 if (err < 0)
694 goto out_skb;
695
696 skb->dev = dev;
697 skb->sk = sk;
698 skb->protocol = htons(ETH_P_IEEE802154);
699
700 dev_put(dev);
701
702 err = dev_queue_xmit(skb);
703 if (err > 0)
704 err = net_xmit_errno(err);
705
706 return err ?: size;
707
708out_skb:
709 kfree_skb(skb);
710out_dev:
711 dev_put(dev);
712out:
713 return err;
714}
715
1b784140
YX		 716static int dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
717 int noblock, int flags, int *addr_len)
78f821b6
AA		 718{
719 size_t copied = 0;
720 int err = -EOPNOTSUPP;
721 struct sk_buff *skb;
722 DECLARE_SOCKADDR(struct sockaddr_ieee802154 *, saddr, msg->msg_name);
723
724 skb = skb_recv_datagram(sk, flags, noblock, &err);
725 if (!skb)
726 goto out;
727
728 copied = skb->len;
729 if (len < copied) {
730 msg->msg_flags |= MSG_TRUNC;
731 copied = len;
732 }
733
734 /* FIXME: skip headers if necessary ?! */
735 err = skb_copy_datagram_msg(skb, 0, msg, copied);
736 if (err)
737 goto done;
738
739 sock_recv_ts_and_drops(msg, sk, skb);
740
741 if (saddr) {
742 saddr->family = AF_IEEE802154;
743 ieee802154_addr_to_sa(&saddr->addr, &mac_cb(skb)->source);
744 *addr_len = sizeof(*saddr);
745 }
746
747 if (flags & MSG_TRUNC)
748 copied = skb->len;
749done:
750 skb_free_datagram(sk, skb);
751out:
752 if (err)
753 return err;
754 return copied;
755}
756
757static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb)
758{
759 skb = skb_share_check(skb, GFP_ATOMIC);
760 if (!skb)
761 return NET_RX_DROP;
762
763 if (sock_queue_rcv_skb(sk, skb) < 0) {
764 kfree_skb(skb);
765 return NET_RX_DROP;
766 }
767
768 return NET_RX_SUCCESS;
769}
770
771static inline bool
772ieee802154_match_sock(__le64 hw_addr, __le16 pan_id, __le16 short_addr,
773 struct dgram_sock *ro)
774{
775 if (!ro->bound)
776 return true;
777
778 if (ro->src_addr.mode == IEEE802154_ADDR_LONG &&
779 hw_addr == ro->src_addr.extended_addr)
780 return true;
781
782 if (ro->src_addr.mode == IEEE802154_ADDR_SHORT &&
783 pan_id == ro->src_addr.pan_id &&
784 short_addr == ro->src_addr.short_addr)
785 return true;
786
787 return false;
788}
789
790static int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb)
791{
792 struct sock *sk, *prev = NULL;
793 int ret = NET_RX_SUCCESS;
794 __le16 pan_id, short_addr;
795 __le64 hw_addr;
796
797 /* Data frame processing */
798 BUG_ON(dev->type != ARPHRD_IEEE802154);
799
800 pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
801 short_addr = ieee802154_mlme_ops(dev)->get_short_addr(dev);
802 hw_addr = ieee802154_devaddr_from_raw(dev->dev_addr);
803
804 read_lock(&dgram_lock);
805 sk_for_each(sk, &dgram_head) {
806 if (ieee802154_match_sock(hw_addr, pan_id, short_addr,
807 dgram_sk(sk))) {
808 if (prev) {
809 struct sk_buff *clone;
810
811 clone = skb_clone(skb, GFP_ATOMIC);
812 if (clone)
813 dgram_rcv_skb(prev, clone);
814 }
815
816 prev = sk;
817 }
818 }
819
820 if (prev) {
821 dgram_rcv_skb(prev, skb);
822 } else {
823 kfree_skb(skb);
824 ret = NET_RX_DROP;
825 }
826 read_unlock(&dgram_lock);
827
828 return ret;
829}
830
831static int dgram_getsockopt(struct sock *sk, int level, int optname,
832 char __user *optval, int __user *optlen)
833{
834 struct dgram_sock *ro = dgram_sk(sk);
835
836 int val, len;
837
838 if (level != SOL_IEEE802154)
839 return -EOPNOTSUPP;
840
841 if (get_user(len, optlen))
842 return -EFAULT;
843
844 len = min_t(unsigned int, len, sizeof(int));
845
846 switch (optname) {
847 case WPAN_WANTACK:
848 val = ro->want_ack;
849 break;
850 case WPAN_SECURITY:
851 if (!ro->secen_override)
852 val = WPAN_SECURITY_DEFAULT;
853 else if (ro->secen)
854 val = WPAN_SECURITY_ON;
855 else
856 val = WPAN_SECURITY_OFF;
857 break;
858 case WPAN_SECURITY_LEVEL:
859 if (!ro->seclevel_override)
860 val = WPAN_SECURITY_LEVEL_DEFAULT;
861 else
862 val = ro->seclevel;
863 break;
864 default:
865 return -ENOPROTOOPT;
866 }
867
868 if (put_user(len, optlen))
869 return -EFAULT;
870 if (copy_to_user(optval, &val, len))
871 return -EFAULT;
872 return 0;
873}
874
875static int dgram_setsockopt(struct sock *sk, int level, int optname,
876 char __user *optval, unsigned int optlen)
877{
878 struct dgram_sock *ro = dgram_sk(sk);
879 struct net *net = sock_net(sk);
880 int val;
881 int err = 0;
882
883 if (optlen < sizeof(int))
884 return -EINVAL;
885
886 if (get_user(val, (int __user *)optval))
887 return -EFAULT;
888
889 lock_sock(sk);
890
891 switch (optname) {
892 case WPAN_WANTACK:
893 ro->want_ack = !!val;
894 break;
895 case WPAN_SECURITY:
896 if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
897 !ns_capable(net->user_ns, CAP_NET_RAW)) {
898 err = -EPERM;
899 break;
900 }
901
902 switch (val) {
903 case WPAN_SECURITY_DEFAULT:
904 ro->secen_override = 0;
905 break;
906 case WPAN_SECURITY_ON:
907 ro->secen_override = 1;
908 ro->secen = 1;
909 break;
910 case WPAN_SECURITY_OFF:
911 ro->secen_override = 1;
912 ro->secen = 0;
913 break;
914 default:
915 err = -EINVAL;
916 break;
917 }
918 break;
919 case WPAN_SECURITY_LEVEL:
920 if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
921 !ns_capable(net->user_ns, CAP_NET_RAW)) {
922 err = -EPERM;
923 break;
924 }
925
926 if (val < WPAN_SECURITY_LEVEL_DEFAULT ||
927 val > IEEE802154_SCF_SECLEVEL_ENC_MIC128) {
928 err = -EINVAL;
929 } else if (val == WPAN_SECURITY_LEVEL_DEFAULT) {
930 ro->seclevel_override = 0;
931 } else {
932 ro->seclevel_override = 1;
933 ro->seclevel = val;
934 }
935 break;
936 default:
937 err = -ENOPROTOOPT;
938 break;
939 }
940
941 release_sock(sk);
942 return err;
943}
944
945static struct proto ieee802154_dgram_prot = {
946 .name = "IEEE-802.15.4-MAC",
947 .owner = THIS_MODULE,
948 .obj_size = sizeof(struct dgram_sock),
949 .init = dgram_init,
950 .close = dgram_close,
951 .bind = dgram_bind,
952 .sendmsg = dgram_sendmsg,
953 .recvmsg = dgram_recvmsg,
954 .hash = dgram_hash,
955 .unhash = dgram_unhash,
956 .connect = dgram_connect,
957 .disconnect = dgram_disconnect,
958 .ioctl = dgram_ioctl,
959 .getsockopt = dgram_getsockopt,
960 .setsockopt = dgram_setsockopt,
961};
962
9ec76716
SL		 963static const struct proto_ops ieee802154_dgram_ops = {
964 .family = PF_IEEE802154,
965 .owner = THIS_MODULE,
966 .release = ieee802154_sock_release,
967 .bind = ieee802154_sock_bind,
968 .connect = ieee802154_sock_connect,
969 .socketpair = sock_no_socketpair,
970 .accept = sock_no_accept,
971 .getname = sock_no_getname,
972 .poll = datagram_poll,
973 .ioctl = ieee802154_sock_ioctl,
974 .listen = sock_no_listen,
975 .shutdown = sock_no_shutdown,
976 .setsockopt = sock_common_setsockopt,
977 .getsockopt = sock_common_getsockopt,
978 .sendmsg = ieee802154_sock_sendmsg,
979 .recvmsg = sock_common_recvmsg,
980 .mmap = sock_no_mmap,
981 .sendpage = sock_no_sendpage,
982#ifdef CONFIG_COMPAT
983 .compat_setsockopt = compat_sock_common_setsockopt,
984 .compat_getsockopt = compat_sock_common_getsockopt,
985#endif
986};
987
4710d806 988/* Create a socket. Initialise the socket, blank the addresses
9ec76716
SL		 989 * set the state.
990 */
991static int ieee802154_create(struct net *net, struct socket *sock,
3f378b68 992 int protocol, int kern)
9ec76716
SL		 993{
994 struct sock *sk;
995 int rc;
996 struct proto *proto;
997 const struct proto_ops *ops;
998
09ad9bc7 999 if (!net_eq(net, &init_net))
9ec76716
SL		 1000 return -EAFNOSUPPORT;
1001
1002 switch (sock->type) {
1003 case SOCK_RAW:
1004 proto = &ieee802154_raw_prot;
1005 ops = &ieee802154_raw_ops;
1006 break;
1007 case SOCK_DGRAM:
1008 proto = &ieee802154_dgram_prot;
1009 ops = &ieee802154_dgram_ops;
1010 break;
1011 default:
1012 rc = -ESOCKTNOSUPPORT;
1013 goto out;
1014 }
1015
1016 rc = -ENOMEM;
1017 sk = sk_alloc(net, PF_IEEE802154, GFP_KERNEL, proto);
1018 if (!sk)
1019 goto out;
1020 rc = 0;
1021
1022 sock->ops = ops;
1023
1024 sock_init_data(sock, sk);
1025 /* FIXME: sk->sk_destruct */
1026 sk->sk_family = PF_IEEE802154;
1027
1028 /* Checksums on by default */
1029 sock_set_flag(sk, SOCK_ZAPPED);
1030
1031 if (sk->sk_prot->hash)
1032 sk->sk_prot->hash(sk);
1033
1034 if (sk->sk_prot->init) {
1035 rc = sk->sk_prot->init(sk);
1036 if (rc)
1037 sk_common_release(sk);
1038 }
1039out:
1040 return rc;
1041}
1042
ec1b4cf7 1043static const struct net_proto_family ieee802154_family_ops = {
9ec76716
SL		 1044 .family = PF_IEEE802154,
1045 .create = ieee802154_create,
1046 .owner = THIS_MODULE,
1047};
1048
1049static int ieee802154_rcv(struct sk_buff *skb, struct net_device *dev,
4710d806 1050 struct packet_type *pt, struct net_device *orig_dev)
9ec76716 1051{
9ec76716 1052 if (!netif_running(dev))
fa1da883 1053 goto drop;
9ec76716 1054 pr_debug("got frame, type %d, dev %p\n", dev->type, dev);
25502bda 1055#ifdef DEBUG
4710d806
VB		 1056 print_hex_dump_bytes("ieee802154_rcv ",
1057 DUMP_PREFIX_NONE, skb->data, skb->len);
25502bda 1058#endif
9ec76716
SL		 1059
1060 if (!net_eq(dev_net(dev), &init_net))
1061 goto drop;
1062
1063 ieee802154_raw_deliver(dev, skb);
1064
1065 if (dev->type != ARPHRD_IEEE802154)
1066 goto drop;
1067
1068 if (skb->pkt_type != PACKET_OTHERHOST)
1069 return ieee802154_dgram_deliver(dev, skb);
1070
1071drop:
1072 kfree_skb(skb);
1073 return NET_RX_DROP;
1074}
1075
9ec76716 1076static struct packet_type ieee802154_packet_type = {
ec633eb5 1077 .type = htons(ETH_P_IEEE802154),
9ec76716
SL		 1078 .func = ieee802154_rcv,
1079};
1080
1081static int __init af_ieee802154_init(void)
1082{
1083 int rc = -EINVAL;
1084
1085 rc = proto_register(&ieee802154_raw_prot, 1);
1086 if (rc)
1087 goto out;
1088
1089 rc = proto_register(&ieee802154_dgram_prot, 1);
1090 if (rc)
1091 goto err_dgram;
1092
1093 /* Tell SOCKET that we are alive */
1094 rc = sock_register(&ieee802154_family_ops);
1095 if (rc)
1096 goto err_sock;
1097 dev_add_pack(&ieee802154_packet_type);
1098
1099 rc = 0;
1100 goto out;
1101
1102err_sock:
1103 proto_unregister(&ieee802154_dgram_prot);
1104err_dgram:
1105 proto_unregister(&ieee802154_raw_prot);
1106out:
1107 return rc;
1108}
6c10dc05 1109
9ec76716
SL		 1110static void __exit af_ieee802154_remove(void)
1111{
1112 dev_remove_pack(&ieee802154_packet_type);
1113 sock_unregister(PF_IEEE802154);
1114 proto_unregister(&ieee802154_dgram_prot);
1115 proto_unregister(&ieee802154_raw_prot);
1116}
1117
1118module_init(af_ieee802154_init);
1119module_exit(af_ieee802154_remove);
1120
1121MODULE_LICENSE("GPL");
1122MODULE_ALIAS_NETPROTO(PF_IEEE802154);
Linux 6.x block layer and io_uring tree(s)