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ieee802154 socket: Return EMSGSIZE from raw_sendmsg() if packet too big.
[deliverable/linux.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
c947f7e1
AA		 67 pan_id = tmp->ieee802154_ptr->pan_id;
68 short_addr = tmp->ieee802154_ptr->short_addr;
e6278d92
PB		 69 if (pan_id == addr->pan_id &&
70 short_addr == addr->short_addr) {
9ec76716
SL		 71 dev = tmp;
72 dev_hold(dev);
73 break;
74 }
75 }
76
77 rtnl_unlock();
78 break;
79 default:
4710d806
VB		 80 pr_warn("Unsupported ieee802154 address type: %d\n",
81 addr->mode);
9ec76716
SL		 82 break;
83 }
84
85 return dev;
86}
87
88static int ieee802154_sock_release(struct socket *sock)
89{
90 struct sock *sk = sock->sk;
91
92 if (sk) {
93 sock->sk = NULL;
94 sk->sk_prot->close(sk, 0);
95 }
96 return 0;
97}
6c10dc05 98
1b784140
YX		 99static int ieee802154_sock_sendmsg(struct socket *sock, struct msghdr *msg,
100 size_t len)
9ec76716
SL		 101{
102 struct sock *sk = sock->sk;
103
1b784140 104 return sk->sk_prot->sendmsg(sk, msg, len);
9ec76716
SL		 105}
106
107static int ieee802154_sock_bind(struct socket *sock, struct sockaddr *uaddr,
4710d806 108 int addr_len)
9ec76716
SL		 109{
110 struct sock *sk = sock->sk;
111
112 if (sk->sk_prot->bind)
113 return sk->sk_prot->bind(sk, uaddr, addr_len);
114
115 return sock_no_bind(sock, uaddr, addr_len);
116}
117
118static int ieee802154_sock_connect(struct socket *sock, struct sockaddr *uaddr,
4710d806 119 int addr_len, int flags)
9ec76716
SL		 120{
121 struct sock *sk = sock->sk;
122
6503d961
CG		 123 if (addr_len < sizeof(uaddr->sa_family))
124 return -EINVAL;
125
9ec76716
SL		 126 if (uaddr->sa_family == AF_UNSPEC)
127 return sk->sk_prot->disconnect(sk, flags);
128
129 return sk->sk_prot->connect(sk, uaddr, addr_len);
130}
131
132static int ieee802154_dev_ioctl(struct sock *sk, struct ifreq __user *arg,
4710d806 133 unsigned int cmd)
9ec76716
SL		 134{
135 struct ifreq ifr;
45a41d14 136 int ret = -ENOIOCTLCMD;
9ec76716
SL		 137 struct net_device *dev;
138
139 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
140 return -EFAULT;
141
142 ifr.ifr_name[IFNAMSIZ-1] = 0;
143
144 dev_load(sock_net(sk), ifr.ifr_name);
145 dev = dev_get_by_name(sock_net(sk), ifr.ifr_name);
45a41d14 146
93c0c8b4
SS		 147 if (!dev)
148 return -ENODEV;
149
929122cd 150 if (dev->type == ARPHRD_IEEE802154 && dev->netdev_ops->ndo_do_ioctl)
9ec76716
SL		 151 ret = dev->netdev_ops->ndo_do_ioctl(dev, &ifr, cmd);
152
153 if (!ret && copy_to_user(arg, &ifr, sizeof(struct ifreq)))
154 ret = -EFAULT;
155 dev_put(dev);
156
157 return ret;
158}
159
160static int ieee802154_sock_ioctl(struct socket *sock, unsigned int cmd,
4710d806 161 unsigned long arg)
9ec76716
SL		 162{
163 struct sock *sk = sock->sk;
164
165 switch (cmd) {
166 case SIOCGSTAMP:
167 return sock_get_timestamp(sk, (struct timeval __user *)arg);
168 case SIOCGSTAMPNS:
169 return sock_get_timestampns(sk, (struct timespec __user *)arg);
170 case SIOCGIFADDR:
171 case SIOCSIFADDR:
172 return ieee802154_dev_ioctl(sk, (struct ifreq __user *)arg,
173 cmd);
174 default:
175 if (!sk->sk_prot->ioctl)
176 return -ENOIOCTLCMD;
177 return sk->sk_prot->ioctl(sk, cmd, arg);
178 }
179}
180
78f821b6
AA		 181/* RAW Sockets (802.15.4 created in userspace) */
182static HLIST_HEAD(raw_head);
183static DEFINE_RWLOCK(raw_lock);
184
185static void raw_hash(struct sock *sk)
186{
187 write_lock_bh(&raw_lock);
188 sk_add_node(sk, &raw_head);
189 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
190 write_unlock_bh(&raw_lock);
191}
192
193static void raw_unhash(struct sock *sk)
194{
195 write_lock_bh(&raw_lock);
196 if (sk_del_node_init(sk))
197 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
198 write_unlock_bh(&raw_lock);
199}
200
201static void raw_close(struct sock *sk, long timeout)
202{
203 sk_common_release(sk);
204}
205
206static int raw_bind(struct sock *sk, struct sockaddr *_uaddr, int len)
207{
208 struct ieee802154_addr addr;
209 struct sockaddr_ieee802154 *uaddr = (struct sockaddr_ieee802154 *)_uaddr;
210 int err = 0;
211 struct net_device *dev = NULL;
212
213 if (len < sizeof(*uaddr))
214 return -EINVAL;
215
216 uaddr = (struct sockaddr_ieee802154 *)_uaddr;
217 if (uaddr->family != AF_IEEE802154)
218 return -EINVAL;
219
220 lock_sock(sk);
221
222 ieee802154_addr_from_sa(&addr, &uaddr->addr);
223 dev = ieee802154_get_dev(sock_net(sk), &addr);
224 if (!dev) {
225 err = -ENODEV;
226 goto out;
227 }
228
229 if (dev->type != ARPHRD_IEEE802154) {
230 err = -ENODEV;
231 goto out_put;
232 }
233
234 sk->sk_bound_dev_if = dev->ifindex;
235 sk_dst_reset(sk);
236
237out_put:
238 dev_put(dev);
239out:
240 release_sock(sk);
241
242 return err;
243}
244
245static int raw_connect(struct sock *sk, struct sockaddr *uaddr,
246 int addr_len)
247{
248 return -ENOTSUPP;
249}
250
251static int raw_disconnect(struct sock *sk, int flags)
252{
253 return 0;
254}
255
1b784140 256static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
78f821b6
AA		 257{
258 struct net_device *dev;
259 unsigned int mtu;
260 struct sk_buff *skb;
261 int hlen, tlen;
262 int err;
263
264 if (msg->msg_flags & MSG_OOB) {
265 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
266 return -EOPNOTSUPP;
267 }
268
269 lock_sock(sk);
270 if (!sk->sk_bound_dev_if)
271 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
272 else
273 dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if);
274 release_sock(sk);
275
276 if (!dev) {
277 pr_debug("no dev\n");
278 err = -ENXIO;
279 goto out;
280 }
281
282 mtu = dev->mtu;
283 pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
284
285 if (size > mtu) {
286 pr_debug("size = %Zu, mtu = %u\n", size, mtu);
c032705e 287 err = -EMSGSIZE;
78f821b6
AA		 288 goto out_dev;
289 }
290
291 hlen = LL_RESERVED_SPACE(dev);
292 tlen = dev->needed_tailroom;
293 skb = sock_alloc_send_skb(sk, hlen + tlen + size,
294 msg->msg_flags & MSG_DONTWAIT, &err);
295 if (!skb)
296 goto out_dev;
297
298 skb_reserve(skb, hlen);
299
300 skb_reset_mac_header(skb);
301 skb_reset_network_header(skb);
302
303 err = memcpy_from_msg(skb_put(skb, size), msg, size);
304 if (err < 0)
305 goto out_skb;
306
307 skb->dev = dev;
308 skb->sk = sk;
309 skb->protocol = htons(ETH_P_IEEE802154);
310
311 dev_put(dev);
312
313 err = dev_queue_xmit(skb);
314 if (err > 0)
315 err = net_xmit_errno(err);
316
317 return err ?: size;
318
319out_skb:
320 kfree_skb(skb);
321out_dev:
322 dev_put(dev);
323out:
324 return err;
325}
326
1b784140
YX		 327static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
328 int noblock, int flags, int *addr_len)
78f821b6
AA		 329{
330 size_t copied = 0;
331 int err = -EOPNOTSUPP;
332 struct sk_buff *skb;
333
334 skb = skb_recv_datagram(sk, flags, noblock, &err);
335 if (!skb)
336 goto out;
337
338 copied = skb->len;
339 if (len < copied) {
340 msg->msg_flags |= MSG_TRUNC;
341 copied = len;
342 }
343
344 err = skb_copy_datagram_msg(skb, 0, msg, copied);
345 if (err)
346 goto done;
347
348 sock_recv_ts_and_drops(msg, sk, skb);
349
350 if (flags & MSG_TRUNC)
351 copied = skb->len;
352done:
353 skb_free_datagram(sk, skb);
354out:
355 if (err)
356 return err;
357 return copied;
358}
359
360static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
361{
362 skb = skb_share_check(skb, GFP_ATOMIC);
363 if (!skb)
364 return NET_RX_DROP;
365
366 if (sock_queue_rcv_skb(sk, skb) < 0) {
367 kfree_skb(skb);
368 return NET_RX_DROP;
369 }
370
371 return NET_RX_SUCCESS;
372}
373
374static void ieee802154_raw_deliver(struct net_device *dev, struct sk_buff *skb)
375{
376 struct sock *sk;
377
378 read_lock(&raw_lock);
379 sk_for_each(sk, &raw_head) {
380 bh_lock_sock(sk);
381 if (!sk->sk_bound_dev_if ||
382 sk->sk_bound_dev_if == dev->ifindex) {
383 struct sk_buff *clone;
384
385 clone = skb_clone(skb, GFP_ATOMIC);
386 if (clone)
387 raw_rcv_skb(sk, clone);
388 }
389 bh_unlock_sock(sk);
390 }
391 read_unlock(&raw_lock);
392}
393
394static int raw_getsockopt(struct sock *sk, int level, int optname,
395 char __user *optval, int __user *optlen)
396{
397 return -EOPNOTSUPP;
398}
399
400static int raw_setsockopt(struct sock *sk, int level, int optname,
401 char __user *optval, unsigned int optlen)
402{
403 return -EOPNOTSUPP;
404}
405
406static struct proto ieee802154_raw_prot = {
407 .name = "IEEE-802.15.4-RAW",
408 .owner = THIS_MODULE,
409 .obj_size = sizeof(struct sock),
410 .close = raw_close,
411 .bind = raw_bind,
412 .sendmsg = raw_sendmsg,
413 .recvmsg = raw_recvmsg,
414 .hash = raw_hash,
415 .unhash = raw_unhash,
416 .connect = raw_connect,
417 .disconnect = raw_disconnect,
418 .getsockopt = raw_getsockopt,
419 .setsockopt = raw_setsockopt,
420};
421
9ec76716
SL		 422static const struct proto_ops ieee802154_raw_ops = {
423 .family = PF_IEEE802154,
424 .owner = THIS_MODULE,
425 .release = ieee802154_sock_release,
426 .bind = ieee802154_sock_bind,
427 .connect = ieee802154_sock_connect,
428 .socketpair = sock_no_socketpair,
429 .accept = sock_no_accept,
430 .getname = sock_no_getname,
431 .poll = datagram_poll,
432 .ioctl = ieee802154_sock_ioctl,
433 .listen = sock_no_listen,
434 .shutdown = sock_no_shutdown,
435 .setsockopt = sock_common_setsockopt,
436 .getsockopt = sock_common_getsockopt,
437 .sendmsg = ieee802154_sock_sendmsg,
438 .recvmsg = sock_common_recvmsg,
439 .mmap = sock_no_mmap,
440 .sendpage = sock_no_sendpage,
441#ifdef CONFIG_COMPAT
442 .compat_setsockopt = compat_sock_common_setsockopt,
443 .compat_getsockopt = compat_sock_common_getsockopt,
444#endif
445};
446
78f821b6
AA		 447/* DGRAM Sockets (802.15.4 dataframes) */
448static HLIST_HEAD(dgram_head);
449static DEFINE_RWLOCK(dgram_lock);
450
451struct dgram_sock {
452 struct sock sk;
453
454 struct ieee802154_addr src_addr;
455 struct ieee802154_addr dst_addr;
456
457 unsigned int bound:1;
458 unsigned int connected:1;
459 unsigned int want_ack:1;
460 unsigned int secen:1;
461 unsigned int secen_override:1;
462 unsigned int seclevel:3;
463 unsigned int seclevel_override:1;
464};
465
466static inline struct dgram_sock *dgram_sk(const struct sock *sk)
467{
468 return container_of(sk, struct dgram_sock, sk);
469}
470
471static void dgram_hash(struct sock *sk)
472{
473 write_lock_bh(&dgram_lock);
474 sk_add_node(sk, &dgram_head);
475 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
476 write_unlock_bh(&dgram_lock);
477}
478
479static void dgram_unhash(struct sock *sk)
480{
481 write_lock_bh(&dgram_lock);
482 if (sk_del_node_init(sk))
483 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
484 write_unlock_bh(&dgram_lock);
485}
486
487static int dgram_init(struct sock *sk)
488{
489 struct dgram_sock *ro = dgram_sk(sk);
490
491 ro->want_ack = 1;
492 return 0;
493}
494
495static void dgram_close(struct sock *sk, long timeout)
496{
497 sk_common_release(sk);
498}
499
500static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len)
501{
502 struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
503 struct ieee802154_addr haddr;
504 struct dgram_sock *ro = dgram_sk(sk);
505 int err = -EINVAL;
506 struct net_device *dev;
507
508 lock_sock(sk);
509
510 ro->bound = 0;
511
512 if (len < sizeof(*addr))
513 goto out;
514
515 if (addr->family != AF_IEEE802154)
516 goto out;
517
518 ieee802154_addr_from_sa(&haddr, &addr->addr);
519 dev = ieee802154_get_dev(sock_net(sk), &haddr);
520 if (!dev) {
521 err = -ENODEV;
522 goto out;
523 }
524
525 if (dev->type != ARPHRD_IEEE802154) {
526 err = -ENODEV;
527 goto out_put;
528 }
529
530 ro->src_addr = haddr;
531
532 ro->bound = 1;
533 err = 0;
534out_put:
535 dev_put(dev);
536out:
537 release_sock(sk);
538
539 return err;
540}
541
542static int dgram_ioctl(struct sock *sk, int cmd, unsigned long arg)
543{
544 switch (cmd) {
545 case SIOCOUTQ:
546 {
547 int amount = sk_wmem_alloc_get(sk);
548
549 return put_user(amount, (int __user *)arg);
550 }
551
552 case SIOCINQ:
553 {
554 struct sk_buff *skb;
555 unsigned long amount;
556
557 amount = 0;
558 spin_lock_bh(&sk->sk_receive_queue.lock);
559 skb = skb_peek(&sk->sk_receive_queue);
df2f65de 560 if (skb) {
78f821b6
AA		 561 /* We will only return the amount
562 * of this packet since that is all
563 * that will be read.
564 */
565 amount = skb->len - ieee802154_hdr_length(skb);
566 }
567 spin_unlock_bh(&sk->sk_receive_queue.lock);
568 return put_user(amount, (int __user *)arg);
569 }
570 }
571
572 return -ENOIOCTLCMD;
573}
574
575/* FIXME: autobind */
576static int dgram_connect(struct sock *sk, struct sockaddr *uaddr,
577 int len)
578{
579 struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
580 struct dgram_sock *ro = dgram_sk(sk);
581 int err = 0;
582
583 if (len < sizeof(*addr))
584 return -EINVAL;
585
586 if (addr->family != AF_IEEE802154)
587 return -EINVAL;
588
589 lock_sock(sk);
590
591 if (!ro->bound) {
592 err = -ENETUNREACH;
593 goto out;
594 }
595
596 ieee802154_addr_from_sa(&ro->dst_addr, &addr->addr);
597 ro->connected = 1;
598
599out:
600 release_sock(sk);
601 return err;
602}
603
604static int dgram_disconnect(struct sock *sk, int flags)
605{
606 struct dgram_sock *ro = dgram_sk(sk);
607
608 lock_sock(sk);
609 ro->connected = 0;
610 release_sock(sk);
611
612 return 0;
613}
614
1b784140 615static int dgram_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
78f821b6
AA		 616{
617 struct net_device *dev;
618 unsigned int mtu;
619 struct sk_buff *skb;
620 struct ieee802154_mac_cb *cb;
621 struct dgram_sock *ro = dgram_sk(sk);
622 struct ieee802154_addr dst_addr;
623 int hlen, tlen;
624 int err;
625
626 if (msg->msg_flags & MSG_OOB) {
627 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
628 return -EOPNOTSUPP;
629 }
630
631 if (!ro->connected && !msg->msg_name)
632 return -EDESTADDRREQ;
633 else if (ro->connected && msg->msg_name)
634 return -EISCONN;
635
636 if (!ro->bound)
637 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
638 else
639 dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr);
640
641 if (!dev) {
642 pr_debug("no dev\n");
643 err = -ENXIO;
644 goto out;
645 }
646 mtu = dev->mtu;
647 pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
648
649 if (size > mtu) {
650 pr_debug("size = %Zu, mtu = %u\n", size, mtu);
651 err = -EMSGSIZE;
652 goto out_dev;
653 }
654
655 hlen = LL_RESERVED_SPACE(dev);
656 tlen = dev->needed_tailroom;
657 skb = sock_alloc_send_skb(sk, hlen + tlen + size,
658 msg->msg_flags & MSG_DONTWAIT,
659 &err);
660 if (!skb)
661 goto out_dev;
662
663 skb_reserve(skb, hlen);
664
665 skb_reset_network_header(skb);
666
667 cb = mac_cb_init(skb);
668 cb->type = IEEE802154_FC_TYPE_DATA;
669 cb->ackreq = ro->want_ack;
670
671 if (msg->msg_name) {
672 DECLARE_SOCKADDR(struct sockaddr_ieee802154*,
673 daddr, msg->msg_name);
674
675 ieee802154_addr_from_sa(&dst_addr, &daddr->addr);
676 } else {
677 dst_addr = ro->dst_addr;
678 }
679
680 cb->secen = ro->secen;
681 cb->secen_override = ro->secen_override;
682 cb->seclevel = ro->seclevel;
683 cb->seclevel_override = ro->seclevel_override;
684
685 err = dev_hard_header(skb, dev, ETH_P_IEEE802154, &dst_addr,
686 ro->bound ? &ro->src_addr : NULL, size);
687 if (err < 0)
688 goto out_skb;
689
690 err = memcpy_from_msg(skb_put(skb, size), msg, size);
691 if (err < 0)
692 goto out_skb;
693
694 skb->dev = dev;
695 skb->sk = sk;
696 skb->protocol = htons(ETH_P_IEEE802154);
697
698 dev_put(dev);
699
700 err = dev_queue_xmit(skb);
701 if (err > 0)
702 err = net_xmit_errno(err);
703
704 return err ?: size;
705
706out_skb:
707 kfree_skb(skb);
708out_dev:
709 dev_put(dev);
710out:
711 return err;
712}
713
1b784140
YX		 714static int dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
715 int noblock, int flags, int *addr_len)
78f821b6
AA		 716{
717 size_t copied = 0;
718 int err = -EOPNOTSUPP;
719 struct sk_buff *skb;
720 DECLARE_SOCKADDR(struct sockaddr_ieee802154 *, saddr, msg->msg_name);
721
722 skb = skb_recv_datagram(sk, flags, noblock, &err);
723 if (!skb)
724 goto out;
725
726 copied = skb->len;
727 if (len < copied) {
728 msg->msg_flags |= MSG_TRUNC;
729 copied = len;
730 }
731
732 /* FIXME: skip headers if necessary ?! */
733 err = skb_copy_datagram_msg(skb, 0, msg, copied);
734 if (err)
735 goto done;
736
737 sock_recv_ts_and_drops(msg, sk, skb);
738
739 if (saddr) {
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 (flags & MSG_TRUNC)
746 copied = skb->len;
747done:
748 skb_free_datagram(sk, skb);
749out:
750 if (err)
751 return err;
752 return copied;
753}
754
755static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb)
756{
757 skb = skb_share_check(skb, GFP_ATOMIC);
758 if (!skb)
759 return NET_RX_DROP;
760
761 if (sock_queue_rcv_skb(sk, skb) < 0) {
762 kfree_skb(skb);
763 return NET_RX_DROP;
764 }
765
766 return NET_RX_SUCCESS;
767}
768
769static inline bool
770ieee802154_match_sock(__le64 hw_addr, __le16 pan_id, __le16 short_addr,
771 struct dgram_sock *ro)
772{
773 if (!ro->bound)
774 return true;
775
776 if (ro->src_addr.mode == IEEE802154_ADDR_LONG &&
777 hw_addr == ro->src_addr.extended_addr)
778 return true;
779
780 if (ro->src_addr.mode == IEEE802154_ADDR_SHORT &&
781 pan_id == ro->src_addr.pan_id &&
782 short_addr == ro->src_addr.short_addr)
783 return true;
784
785 return false;
786}
787
788static int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb)
789{
790 struct sock *sk, *prev = NULL;
791 int ret = NET_RX_SUCCESS;
792 __le16 pan_id, short_addr;
793 __le64 hw_addr;
794
795 /* Data frame processing */
796 BUG_ON(dev->type != ARPHRD_IEEE802154);
797
c947f7e1
AA		 798 pan_id = dev->ieee802154_ptr->pan_id;
799 short_addr = dev->ieee802154_ptr->short_addr;
800 hw_addr = dev->ieee802154_ptr->extended_addr;
78f821b6
AA		 801
802 read_lock(&dgram_lock);
803 sk_for_each(sk, &dgram_head) {
804 if (ieee802154_match_sock(hw_addr, pan_id, short_addr,
805 dgram_sk(sk))) {
806 if (prev) {
807 struct sk_buff *clone;
808
809 clone = skb_clone(skb, GFP_ATOMIC);
810 if (clone)
811 dgram_rcv_skb(prev, clone);
812 }
813
814 prev = sk;
815 }
816 }
817
818 if (prev) {
819 dgram_rcv_skb(prev, skb);
820 } else {
821 kfree_skb(skb);
822 ret = NET_RX_DROP;
823 }
824 read_unlock(&dgram_lock);
825
826 return ret;
827}
828
829static int dgram_getsockopt(struct sock *sk, int level, int optname,
830 char __user *optval, int __user *optlen)
831{
832 struct dgram_sock *ro = dgram_sk(sk);
833
834 int val, len;
835
836 if (level != SOL_IEEE802154)
837 return -EOPNOTSUPP;
838
839 if (get_user(len, optlen))
840 return -EFAULT;
841
842 len = min_t(unsigned int, len, sizeof(int));
843
844 switch (optname) {
845 case WPAN_WANTACK:
846 val = ro->want_ack;
847 break;
848 case WPAN_SECURITY:
849 if (!ro->secen_override)
850 val = WPAN_SECURITY_DEFAULT;
851 else if (ro->secen)
852 val = WPAN_SECURITY_ON;
853 else
854 val = WPAN_SECURITY_OFF;
855 break;
856 case WPAN_SECURITY_LEVEL:
857 if (!ro->seclevel_override)
858 val = WPAN_SECURITY_LEVEL_DEFAULT;
859 else
860 val = ro->seclevel;
861 break;
862 default:
863 return -ENOPROTOOPT;
864 }
865
866 if (put_user(len, optlen))
867 return -EFAULT;
868 if (copy_to_user(optval, &val, len))
869 return -EFAULT;
870 return 0;
871}
872
873static int dgram_setsockopt(struct sock *sk, int level, int optname,
874 char __user *optval, unsigned int optlen)
875{
876 struct dgram_sock *ro = dgram_sk(sk);
877 struct net *net = sock_net(sk);
878 int val;
879 int err = 0;
880
881 if (optlen < sizeof(int))
882 return -EINVAL;
883
884 if (get_user(val, (int __user *)optval))
885 return -EFAULT;
886
887 lock_sock(sk);
888
889 switch (optname) {
890 case WPAN_WANTACK:
891 ro->want_ack = !!val;
892 break;
893 case WPAN_SECURITY:
894 if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
895 !ns_capable(net->user_ns, CAP_NET_RAW)) {
896 err = -EPERM;
897 break;
898 }
899
900 switch (val) {
901 case WPAN_SECURITY_DEFAULT:
902 ro->secen_override = 0;
903 break;
904 case WPAN_SECURITY_ON:
905 ro->secen_override = 1;
906 ro->secen = 1;
907 break;
908 case WPAN_SECURITY_OFF:
909 ro->secen_override = 1;
910 ro->secen = 0;
911 break;
912 default:
913 err = -EINVAL;
914 break;
915 }
916 break;
917 case WPAN_SECURITY_LEVEL:
918 if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
919 !ns_capable(net->user_ns, CAP_NET_RAW)) {
920 err = -EPERM;
921 break;
922 }
923
924 if (val < WPAN_SECURITY_LEVEL_DEFAULT ||
925 val > IEEE802154_SCF_SECLEVEL_ENC_MIC128) {
926 err = -EINVAL;
927 } else if (val == WPAN_SECURITY_LEVEL_DEFAULT) {
928 ro->seclevel_override = 0;
929 } else {
930 ro->seclevel_override = 1;
931 ro->seclevel = val;
932 }
933 break;
934 default:
935 err = -ENOPROTOOPT;
936 break;
937 }
938
939 release_sock(sk);
940 return err;
941}
942
943static struct proto ieee802154_dgram_prot = {
944 .name = "IEEE-802.15.4-MAC",
945 .owner = THIS_MODULE,
946 .obj_size = sizeof(struct dgram_sock),
947 .init = dgram_init,
948 .close = dgram_close,
949 .bind = dgram_bind,
950 .sendmsg = dgram_sendmsg,
951 .recvmsg = dgram_recvmsg,
952 .hash = dgram_hash,
953 .unhash = dgram_unhash,
954 .connect = dgram_connect,
955 .disconnect = dgram_disconnect,
956 .ioctl = dgram_ioctl,
957 .getsockopt = dgram_getsockopt,
958 .setsockopt = dgram_setsockopt,
959};
960
9ec76716
SL		 961static const struct proto_ops ieee802154_dgram_ops = {
962 .family = PF_IEEE802154,
963 .owner = THIS_MODULE,
964 .release = ieee802154_sock_release,
965 .bind = ieee802154_sock_bind,
966 .connect = ieee802154_sock_connect,
967 .socketpair = sock_no_socketpair,
968 .accept = sock_no_accept,
969 .getname = sock_no_getname,
970 .poll = datagram_poll,
971 .ioctl = ieee802154_sock_ioctl,
972 .listen = sock_no_listen,
973 .shutdown = sock_no_shutdown,
974 .setsockopt = sock_common_setsockopt,
975 .getsockopt = sock_common_getsockopt,
976 .sendmsg = ieee802154_sock_sendmsg,
977 .recvmsg = sock_common_recvmsg,
978 .mmap = sock_no_mmap,
979 .sendpage = sock_no_sendpage,
980#ifdef CONFIG_COMPAT
981 .compat_setsockopt = compat_sock_common_setsockopt,
982 .compat_getsockopt = compat_sock_common_getsockopt,
983#endif
984};
985
4710d806 986/* Create a socket. Initialise the socket, blank the addresses
9ec76716
SL		 987 * set the state.
988 */
989static int ieee802154_create(struct net *net, struct socket *sock,
3f378b68 990 int protocol, int kern)
9ec76716
SL		 991{
992 struct sock *sk;
993 int rc;
994 struct proto *proto;
995 const struct proto_ops *ops;
996
09ad9bc7 997 if (!net_eq(net, &init_net))
9ec76716
SL		 998 return -EAFNOSUPPORT;
999
1000 switch (sock->type) {
1001 case SOCK_RAW:
1002 proto = &ieee802154_raw_prot;
1003 ops = &ieee802154_raw_ops;
1004 break;
1005 case SOCK_DGRAM:
1006 proto = &ieee802154_dgram_prot;
1007 ops = &ieee802154_dgram_ops;
1008 break;
1009 default:
1010 rc = -ESOCKTNOSUPPORT;
1011 goto out;
1012 }
1013
1014 rc = -ENOMEM;
11aa9c28 1015 sk = sk_alloc(net, PF_IEEE802154, GFP_KERNEL, proto, kern);
9ec76716
SL		 1016 if (!sk)
1017 goto out;
1018 rc = 0;
1019
1020 sock->ops = ops;
1021
1022 sock_init_data(sock, sk);
1023 /* FIXME: sk->sk_destruct */
1024 sk->sk_family = PF_IEEE802154;
1025
1026 /* Checksums on by default */
1027 sock_set_flag(sk, SOCK_ZAPPED);
1028
1029 if (sk->sk_prot->hash)
1030 sk->sk_prot->hash(sk);
1031
1032 if (sk->sk_prot->init) {
1033 rc = sk->sk_prot->init(sk);
1034 if (rc)
1035 sk_common_release(sk);
1036 }
1037out:
1038 return rc;
1039}
1040
ec1b4cf7 1041static const struct net_proto_family ieee802154_family_ops = {
9ec76716
SL		 1042 .family = PF_IEEE802154,
1043 .create = ieee802154_create,
1044 .owner = THIS_MODULE,
1045};
1046
1047static int ieee802154_rcv(struct sk_buff *skb, struct net_device *dev,
4710d806 1048 struct packet_type *pt, struct net_device *orig_dev)
9ec76716 1049{
9ec76716 1050 if (!netif_running(dev))
fa1da883 1051 goto drop;
9ec76716 1052 pr_debug("got frame, type %d, dev %p\n", dev->type, dev);
25502bda 1053#ifdef DEBUG
4710d806
VB		 1054 print_hex_dump_bytes("ieee802154_rcv ",
1055 DUMP_PREFIX_NONE, skb->data, skb->len);
25502bda 1056#endif
9ec76716
SL		 1057
1058 if (!net_eq(dev_net(dev), &init_net))
1059 goto drop;
1060
1061 ieee802154_raw_deliver(dev, skb);
1062
1063 if (dev->type != ARPHRD_IEEE802154)
1064 goto drop;
1065
1066 if (skb->pkt_type != PACKET_OTHERHOST)
1067 return ieee802154_dgram_deliver(dev, skb);
1068
1069drop:
1070 kfree_skb(skb);
1071 return NET_RX_DROP;
1072}
1073
9ec76716 1074static struct packet_type ieee802154_packet_type = {
ec633eb5 1075 .type = htons(ETH_P_IEEE802154),
9ec76716
SL		 1076 .func = ieee802154_rcv,
1077};
1078
1079static int __init af_ieee802154_init(void)
1080{
1081 int rc = -EINVAL;
1082
1083 rc = proto_register(&ieee802154_raw_prot, 1);
1084 if (rc)
1085 goto out;
1086
1087 rc = proto_register(&ieee802154_dgram_prot, 1);
1088 if (rc)
1089 goto err_dgram;
1090
1091 /* Tell SOCKET that we are alive */
1092 rc = sock_register(&ieee802154_family_ops);
1093 if (rc)
1094 goto err_sock;
1095 dev_add_pack(&ieee802154_packet_type);
1096
1097 rc = 0;
1098 goto out;
1099
1100err_sock:
1101 proto_unregister(&ieee802154_dgram_prot);
1102err_dgram:
1103 proto_unregister(&ieee802154_raw_prot);
1104out:
1105 return rc;
1106}
6c10dc05 1107
9ec76716
SL		 1108static void __exit af_ieee802154_remove(void)
1109{
1110 dev_remove_pack(&ieee802154_packet_type);
1111 sock_unregister(PF_IEEE802154);
1112 proto_unregister(&ieee802154_dgram_prot);
1113 proto_unregister(&ieee802154_raw_prot);
1114}
1115
1116module_init(af_ieee802154_init);
1117module_exit(af_ieee802154_remove);
1118
1119MODULE_LICENSE("GPL");
1120MODULE_ALIAS_NETPROTO(PF_IEEE802154);
Linux kernel - Deliverables
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