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Linux/net/ieee802154/socket.c

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  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  *
 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>
 27 #include <linux/slab.h>
 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 
 34 #include <net/af_ieee802154.h>
 35 #include <net/ieee802154_netdev.h>
 36 
 37 /* Utility function for families */
 38 static struct net_device*
 39 ieee802154_get_dev(struct net *net, const struct ieee802154_addr *addr)
 40 {
 41         struct net_device *dev = NULL;
 42         struct net_device *tmp;
 43         __le16 pan_id, short_addr;
 44         u8 hwaddr[IEEE802154_ADDR_LEN];
 45 
 46         switch (addr->mode) {
 47         case IEEE802154_ADDR_LONG:
 48                 ieee802154_devaddr_to_raw(hwaddr, addr->extended_addr);
 49                 rcu_read_lock();
 50                 dev = dev_getbyhwaddr_rcu(net, ARPHRD_IEEE802154, hwaddr);
 51                 if (dev)
 52                         dev_hold(dev);
 53                 rcu_read_unlock();
 54                 break;
 55         case IEEE802154_ADDR_SHORT:
 56                 if (addr->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST) ||
 57                     addr->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
 58                     addr->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST))
 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 = tmp->ieee802154_ptr->pan_id;
 68                         short_addr = tmp->ieee802154_ptr->short_addr;
 69                         if (pan_id == addr->pan_id &&
 70                             short_addr == addr->short_addr) {
 71                                 dev = tmp;
 72                                 dev_hold(dev);
 73                                 break;
 74                         }
 75                 }
 76 
 77                 rtnl_unlock();
 78                 break;
 79         default:
 80                 pr_warn("Unsupported ieee802154 address type: %d\n",
 81                         addr->mode);
 82                 break;
 83         }
 84 
 85         return dev;
 86 }
 87 
 88 static 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 }
 98 
 99 static int ieee802154_sock_sendmsg(struct socket *sock, struct msghdr *msg,
100                                    size_t len)
101 {
102         struct sock *sk = sock->sk;
103 
104         return sk->sk_prot->sendmsg(sk, msg, len);
105 }
106 
107 static int ieee802154_sock_bind(struct socket *sock, struct sockaddr *uaddr,
108                                 int addr_len)
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 
118 static int ieee802154_sock_connect(struct socket *sock, struct sockaddr *uaddr,
119                                    int addr_len, int flags)
120 {
121         struct sock *sk = sock->sk;
122 
123         if (addr_len < sizeof(uaddr->sa_family))
124                 return -EINVAL;
125 
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 
132 static int ieee802154_dev_ioctl(struct sock *sk, struct ifreq __user *arg,
133                                 unsigned int cmd)
134 {
135         struct ifreq ifr;
136         int ret = -ENOIOCTLCMD;
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);
146 
147         if (!dev)
148                 return -ENODEV;
149 
150         if (dev->type == ARPHRD_IEEE802154 && dev->netdev_ops->ndo_do_ioctl)
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 
160 static int ieee802154_sock_ioctl(struct socket *sock, unsigned int cmd,
161                                  unsigned long arg)
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 
181 /* RAW Sockets (802.15.4 created in userspace) */
182 static HLIST_HEAD(raw_head);
183 static DEFINE_RWLOCK(raw_lock);
184 
185 static int 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         return 0;
193 }
194 
195 static 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 
203 static void raw_close(struct sock *sk, long timeout)
204 {
205         sk_common_release(sk);
206 }
207 
208 static 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         sk->sk_bound_dev_if = dev->ifindex;
232         sk_dst_reset(sk);
233 
234         dev_put(dev);
235 out:
236         release_sock(sk);
237 
238         return err;
239 }
240 
241 static int raw_connect(struct sock *sk, struct sockaddr *uaddr,
242                        int addr_len)
243 {
244         return -ENOTSUPP;
245 }
246 
247 static int raw_disconnect(struct sock *sk, int flags)
248 {
249         return 0;
250 }
251 
252 static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
253 {
254         struct net_device *dev;
255         unsigned int mtu;
256         struct sk_buff *skb;
257         int hlen, tlen;
258         int err;
259 
260         if (msg->msg_flags & MSG_OOB) {
261                 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
262                 return -EOPNOTSUPP;
263         }
264 
265         lock_sock(sk);
266         if (!sk->sk_bound_dev_if)
267                 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
268         else
269                 dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if);
270         release_sock(sk);
271 
272         if (!dev) {
273                 pr_debug("no dev\n");
274                 err = -ENXIO;
275                 goto out;
276         }
277 
278         mtu = IEEE802154_MTU;
279         pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
280 
281         if (size > mtu) {
282                 pr_debug("size = %zu, mtu = %u\n", size, mtu);
283                 err = -EMSGSIZE;
284                 goto out_dev;
285         }
286 
287         hlen = LL_RESERVED_SPACE(dev);
288         tlen = dev->needed_tailroom;
289         skb = sock_alloc_send_skb(sk, hlen + tlen + size,
290                                   msg->msg_flags & MSG_DONTWAIT, &err);
291         if (!skb)
292                 goto out_dev;
293 
294         skb_reserve(skb, hlen);
295 
296         skb_reset_mac_header(skb);
297         skb_reset_network_header(skb);
298 
299         err = memcpy_from_msg(skb_put(skb, size), msg, size);
300         if (err < 0)
301                 goto out_skb;
302 
303         skb->dev = dev;
304         skb->protocol = htons(ETH_P_IEEE802154);
305 
306         err = dev_queue_xmit(skb);
307         if (err > 0)
308                 err = net_xmit_errno(err);
309 
310         dev_put(dev);
311 
312         return err ?: size;
313 
314 out_skb:
315         kfree_skb(skb);
316 out_dev:
317         dev_put(dev);
318 out:
319         return err;
320 }
321 
322 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
323                        int noblock, int flags, int *addr_len)
324 {
325         size_t copied = 0;
326         int err = -EOPNOTSUPP;
327         struct sk_buff *skb;
328 
329         skb = skb_recv_datagram(sk, flags, noblock, &err);
330         if (!skb)
331                 goto out;
332 
333         copied = skb->len;
334         if (len < copied) {
335                 msg->msg_flags |= MSG_TRUNC;
336                 copied = len;
337         }
338 
339         err = skb_copy_datagram_msg(skb, 0, msg, copied);
340         if (err)
341                 goto done;
342 
343         sock_recv_ts_and_drops(msg, sk, skb);
344 
345         if (flags & MSG_TRUNC)
346                 copied = skb->len;
347 done:
348         skb_free_datagram(sk, skb);
349 out:
350         if (err)
351                 return err;
352         return copied;
353 }
354 
355 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
356 {
357         skb = skb_share_check(skb, GFP_ATOMIC);
358         if (!skb)
359                 return NET_RX_DROP;
360 
361         if (sock_queue_rcv_skb(sk, skb) < 0) {
362                 kfree_skb(skb);
363                 return NET_RX_DROP;
364         }
365 
366         return NET_RX_SUCCESS;
367 }
368 
369 static void ieee802154_raw_deliver(struct net_device *dev, struct sk_buff *skb)
370 {
371         struct sock *sk;
372 
373         read_lock(&raw_lock);
374         sk_for_each(sk, &raw_head) {
375                 bh_lock_sock(sk);
376                 if (!sk->sk_bound_dev_if ||
377                     sk->sk_bound_dev_if == dev->ifindex) {
378                         struct sk_buff *clone;
379 
380                         clone = skb_clone(skb, GFP_ATOMIC);
381                         if (clone)
382                                 raw_rcv_skb(sk, clone);
383                 }
384                 bh_unlock_sock(sk);
385         }
386         read_unlock(&raw_lock);
387 }
388 
389 static int raw_getsockopt(struct sock *sk, int level, int optname,
390                           char __user *optval, int __user *optlen)
391 {
392         return -EOPNOTSUPP;
393 }
394 
395 static int raw_setsockopt(struct sock *sk, int level, int optname,
396                           char __user *optval, unsigned int optlen)
397 {
398         return -EOPNOTSUPP;
399 }
400 
401 static struct proto ieee802154_raw_prot = {
402         .name           = "IEEE-802.15.4-RAW",
403         .owner          = THIS_MODULE,
404         .obj_size       = sizeof(struct sock),
405         .close          = raw_close,
406         .bind           = raw_bind,
407         .sendmsg        = raw_sendmsg,
408         .recvmsg        = raw_recvmsg,
409         .hash           = raw_hash,
410         .unhash         = raw_unhash,
411         .connect        = raw_connect,
412         .disconnect     = raw_disconnect,
413         .getsockopt     = raw_getsockopt,
414         .setsockopt     = raw_setsockopt,
415 };
416 
417 static const struct proto_ops ieee802154_raw_ops = {
418         .family            = PF_IEEE802154,
419         .owner             = THIS_MODULE,
420         .release           = ieee802154_sock_release,
421         .bind              = ieee802154_sock_bind,
422         .connect           = ieee802154_sock_connect,
423         .socketpair        = sock_no_socketpair,
424         .accept            = sock_no_accept,
425         .getname           = sock_no_getname,
426         .poll              = datagram_poll,
427         .ioctl             = ieee802154_sock_ioctl,
428         .listen            = sock_no_listen,
429         .shutdown          = sock_no_shutdown,
430         .setsockopt        = sock_common_setsockopt,
431         .getsockopt        = sock_common_getsockopt,
432         .sendmsg           = ieee802154_sock_sendmsg,
433         .recvmsg           = sock_common_recvmsg,
434         .mmap              = sock_no_mmap,
435         .sendpage          = sock_no_sendpage,
436 #ifdef CONFIG_COMPAT
437         .compat_setsockopt = compat_sock_common_setsockopt,
438         .compat_getsockopt = compat_sock_common_getsockopt,
439 #endif
440 };
441 
442 /* DGRAM Sockets (802.15.4 dataframes) */
443 static HLIST_HEAD(dgram_head);
444 static DEFINE_RWLOCK(dgram_lock);
445 
446 struct dgram_sock {
447         struct sock sk;
448 
449         struct ieee802154_addr src_addr;
450         struct ieee802154_addr dst_addr;
451 
452         unsigned int bound:1;
453         unsigned int connected:1;
454         unsigned int want_ack:1;
455         unsigned int secen:1;
456         unsigned int secen_override:1;
457         unsigned int seclevel:3;
458         unsigned int seclevel_override:1;
459 };
460 
461 static inline struct dgram_sock *dgram_sk(const struct sock *sk)
462 {
463         return container_of(sk, struct dgram_sock, sk);
464 }
465 
466 static int dgram_hash(struct sock *sk)
467 {
468         write_lock_bh(&dgram_lock);
469         sk_add_node(sk, &dgram_head);
470         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
471         write_unlock_bh(&dgram_lock);
472 
473         return 0;
474 }
475 
476 static void dgram_unhash(struct sock *sk)
477 {
478         write_lock_bh(&dgram_lock);
479         if (sk_del_node_init(sk))
480                 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
481         write_unlock_bh(&dgram_lock);
482 }
483 
484 static int dgram_init(struct sock *sk)
485 {
486         struct dgram_sock *ro = dgram_sk(sk);
487 
488         ro->want_ack = 1;
489         return 0;
490 }
491 
492 static void dgram_close(struct sock *sk, long timeout)
493 {
494         sk_common_release(sk);
495 }
496 
497 static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len)
498 {
499         struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
500         struct ieee802154_addr haddr;
501         struct dgram_sock *ro = dgram_sk(sk);
502         int err = -EINVAL;
503         struct net_device *dev;
504 
505         lock_sock(sk);
506 
507         ro->bound = 0;
508 
509         if (len < sizeof(*addr))
510                 goto out;
511 
512         if (addr->family != AF_IEEE802154)
513                 goto out;
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 
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 */
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         if (len < sizeof(*addr))
581                 return -EINVAL;
582 
583         if (addr->family != AF_IEEE802154)
584                 return -EINVAL;
585 
586         lock_sock(sk);
587 
588         if (!ro->bound) {
589                 err = -ENETUNREACH;
590                 goto out;
591         }
592 
593         ieee802154_addr_from_sa(&ro->dst_addr, &addr->addr);
594         ro->connected = 1;
595 
596 out:
597         release_sock(sk);
598         return err;
599 }
600 
601 static int dgram_disconnect(struct sock *sk, int flags)
602 {
603         struct dgram_sock *ro = dgram_sk(sk);
604 
605         lock_sock(sk);
606         ro->connected = 0;
607         release_sock(sk);
608 
609         return 0;
610 }
611 
612 static int dgram_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
613 {
614         struct net_device *dev;
615         unsigned int mtu;
616         struct sk_buff *skb;
617         struct ieee802154_mac_cb *cb;
618         struct dgram_sock *ro = dgram_sk(sk);
619         struct ieee802154_addr dst_addr;
620         int hlen, tlen;
621         int err;
622 
623         if (msg->msg_flags & MSG_OOB) {
624                 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
625                 return -EOPNOTSUPP;
626         }
627 
628         if (!ro->connected && !msg->msg_name)
629                 return -EDESTADDRREQ;
630         else if (ro->connected && msg->msg_name)
631                 return -EISCONN;
632 
633         if (!ro->bound)
634                 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
635         else
636                 dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr);
637 
638         if (!dev) {
639                 pr_debug("no dev\n");
640                 err = -ENXIO;
641                 goto out;
642         }
643         mtu = IEEE802154_MTU;
644         pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
645 
646         if (size > mtu) {
647                 pr_debug("size = %zu, mtu = %u\n", size, mtu);
648                 err = -EMSGSIZE;
649                 goto out_dev;
650         }
651 
652         hlen = LL_RESERVED_SPACE(dev);
653         tlen = dev->needed_tailroom;
654         skb = sock_alloc_send_skb(sk, hlen + tlen + size,
655                                   msg->msg_flags & MSG_DONTWAIT,
656                                   &err);
657         if (!skb)
658                 goto out_dev;
659 
660         skb_reserve(skb, hlen);
661 
662         skb_reset_network_header(skb);
663 
664         cb = mac_cb_init(skb);
665         cb->type = IEEE802154_FC_TYPE_DATA;
666         cb->ackreq = ro->want_ack;
667 
668         if (msg->msg_name) {
669                 DECLARE_SOCKADDR(struct sockaddr_ieee802154*,
670                                  daddr, msg->msg_name);
671 
672                 ieee802154_addr_from_sa(&dst_addr, &daddr->addr);
673         } else {
674                 dst_addr = ro->dst_addr;
675         }
676 
677         cb->secen = ro->secen;
678         cb->secen_override = ro->secen_override;
679         cb->seclevel = ro->seclevel;
680         cb->seclevel_override = ro->seclevel_override;
681 
682         err = wpan_dev_hard_header(skb, dev, &dst_addr,
683                                    ro->bound ? &ro->src_addr : NULL, size);
684         if (err < 0)
685                 goto out_skb;
686 
687         err = memcpy_from_msg(skb_put(skb, size), msg, size);
688         if (err < 0)
689                 goto out_skb;
690 
691         skb->dev = dev;
692         skb->protocol = htons(ETH_P_IEEE802154);
693 
694         err = dev_queue_xmit(skb);
695         if (err > 0)
696                 err = net_xmit_errno(err);
697 
698         dev_put(dev);
699 
700         return err ?: size;
701 
702 out_skb:
703         kfree_skb(skb);
704 out_dev:
705         dev_put(dev);
706 out:
707         return err;
708 }
709 
710 static int dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
711                          int noblock, int flags, int *addr_len)
712 {
713         size_t copied = 0;
714         int err = -EOPNOTSUPP;
715         struct sk_buff *skb;
716         DECLARE_SOCKADDR(struct sockaddr_ieee802154 *, saddr, msg->msg_name);
717 
718         skb = skb_recv_datagram(sk, flags, noblock, &err);
719         if (!skb)
720                 goto out;
721 
722         copied = skb->len;
723         if (len < copied) {
724                 msg->msg_flags |= MSG_TRUNC;
725                 copied = len;
726         }
727 
728         /* FIXME: skip headers if necessary ?! */
729         err = skb_copy_datagram_msg(skb, 0, msg, copied);
730         if (err)
731                 goto done;
732 
733         sock_recv_ts_and_drops(msg, sk, skb);
734 
735         if (saddr) {
736                 /* Clear the implicit padding in struct sockaddr_ieee802154
737                  * (16 bits between 'family' and 'addr') and in struct
738                  * ieee802154_addr_sa (16 bits at the end of the structure).
739                  */
740                 memset(saddr, 0, sizeof(*saddr));
741 
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;
749 done:
750         skb_free_datagram(sk, skb);
751 out:
752         if (err)
753                 return err;
754         return copied;
755 }
756 
757 static 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 
771 static inline bool
772 ieee802154_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 
790 static 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 = dev->ieee802154_ptr->pan_id;
801         short_addr = dev->ieee802154_ptr->short_addr;
802         hw_addr = dev->ieee802154_ptr->extended_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 
831 static 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 
875 static 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 
945 static 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 
963 static 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 
988 /* Create a socket. Initialise the socket, blank the addresses
989  * set the state.
990  */
991 static int ieee802154_create(struct net *net, struct socket *sock,
992                              int protocol, int kern)
993 {
994         struct sock *sk;
995         int rc;
996         struct proto *proto;
997         const struct proto_ops *ops;
998 
999         if (!net_eq(net, &init_net))
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, kern);
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                 rc = sk->sk_prot->hash(sk);
1033                 if (rc) {
1034                         sk_common_release(sk);
1035                         goto out;
1036                 }
1037         }
1038 
1039         if (sk->sk_prot->init) {
1040                 rc = sk->sk_prot->init(sk);
1041                 if (rc)
1042                         sk_common_release(sk);
1043         }
1044 out:
1045         return rc;
1046 }
1047 
1048 static const struct net_proto_family ieee802154_family_ops = {
1049         .family         = PF_IEEE802154,
1050         .create         = ieee802154_create,
1051         .owner          = THIS_MODULE,
1052 };
1053 
1054 static int ieee802154_rcv(struct sk_buff *skb, struct net_device *dev,
1055                           struct packet_type *pt, struct net_device *orig_dev)
1056 {
1057         if (!netif_running(dev))
1058                 goto drop;
1059         pr_debug("got frame, type %d, dev %p\n", dev->type, dev);
1060 #ifdef DEBUG
1061         print_hex_dump_bytes("ieee802154_rcv ",
1062                              DUMP_PREFIX_NONE, skb->data, skb->len);
1063 #endif
1064 
1065         if (!net_eq(dev_net(dev), &init_net))
1066                 goto drop;
1067 
1068         ieee802154_raw_deliver(dev, skb);
1069 
1070         if (dev->type != ARPHRD_IEEE802154)
1071                 goto drop;
1072 
1073         if (skb->pkt_type != PACKET_OTHERHOST)
1074                 return ieee802154_dgram_deliver(dev, skb);
1075 
1076 drop:
1077         kfree_skb(skb);
1078         return NET_RX_DROP;
1079 }
1080 
1081 static struct packet_type ieee802154_packet_type = {
1082         .type = htons(ETH_P_IEEE802154),
1083         .func = ieee802154_rcv,
1084 };
1085 
1086 static int __init af_ieee802154_init(void)
1087 {
1088         int rc = -EINVAL;
1089 
1090         rc = proto_register(&ieee802154_raw_prot, 1);
1091         if (rc)
1092                 goto out;
1093 
1094         rc = proto_register(&ieee802154_dgram_prot, 1);
1095         if (rc)
1096                 goto err_dgram;
1097 
1098         /* Tell SOCKET that we are alive */
1099         rc = sock_register(&ieee802154_family_ops);
1100         if (rc)
1101                 goto err_sock;
1102         dev_add_pack(&ieee802154_packet_type);
1103 
1104         rc = 0;
1105         goto out;
1106 
1107 err_sock:
1108         proto_unregister(&ieee802154_dgram_prot);
1109 err_dgram:
1110         proto_unregister(&ieee802154_raw_prot);
1111 out:
1112         return rc;
1113 }
1114 
1115 static void __exit af_ieee802154_remove(void)
1116 {
1117         dev_remove_pack(&ieee802154_packet_type);
1118         sock_unregister(PF_IEEE802154);
1119         proto_unregister(&ieee802154_dgram_prot);
1120         proto_unregister(&ieee802154_raw_prot);
1121 }
1122 
1123 module_init(af_ieee802154_init);
1124 module_exit(af_ieee802154_remove);
1125 
1126 MODULE_LICENSE("GPL");
1127 MODULE_ALIAS_NETPROTO(PF_IEEE802154);
1128 

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