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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->sk  = sk;
305         skb->protocol = htons(ETH_P_IEEE802154);
306 
307         dev_put(dev);
308 
309         err = dev_queue_xmit(skb);
310         if (err > 0)
311                 err = net_xmit_errno(err);
312 
313         return err ?: size;
314 
315 out_skb:
316         kfree_skb(skb);
317 out_dev:
318         dev_put(dev);
319 out:
320         return err;
321 }
322 
323 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
324                        int noblock, int flags, int *addr_len)
325 {
326         size_t copied = 0;
327         int err = -EOPNOTSUPP;
328         struct sk_buff *skb;
329 
330         skb = skb_recv_datagram(sk, flags, noblock, &err);
331         if (!skb)
332                 goto out;
333 
334         copied = skb->len;
335         if (len < copied) {
336                 msg->msg_flags |= MSG_TRUNC;
337                 copied = len;
338         }
339 
340         err = skb_copy_datagram_msg(skb, 0, msg, copied);
341         if (err)
342                 goto done;
343 
344         sock_recv_ts_and_drops(msg, sk, skb);
345 
346         if (flags & MSG_TRUNC)
347                 copied = skb->len;
348 done:
349         skb_free_datagram(sk, skb);
350 out:
351         if (err)
352                 return err;
353         return copied;
354 }
355 
356 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
357 {
358         skb = skb_share_check(skb, GFP_ATOMIC);
359         if (!skb)
360                 return NET_RX_DROP;
361 
362         if (sock_queue_rcv_skb(sk, skb) < 0) {
363                 kfree_skb(skb);
364                 return NET_RX_DROP;
365         }
366 
367         return NET_RX_SUCCESS;
368 }
369 
370 static void ieee802154_raw_deliver(struct net_device *dev, struct sk_buff *skb)
371 {
372         struct sock *sk;
373 
374         read_lock(&raw_lock);
375         sk_for_each(sk, &raw_head) {
376                 bh_lock_sock(sk);
377                 if (!sk->sk_bound_dev_if ||
378                     sk->sk_bound_dev_if == dev->ifindex) {
379                         struct sk_buff *clone;
380 
381                         clone = skb_clone(skb, GFP_ATOMIC);
382                         if (clone)
383                                 raw_rcv_skb(sk, clone);
384                 }
385                 bh_unlock_sock(sk);
386         }
387         read_unlock(&raw_lock);
388 }
389 
390 static int raw_getsockopt(struct sock *sk, int level, int optname,
391                           char __user *optval, int __user *optlen)
392 {
393         return -EOPNOTSUPP;
394 }
395 
396 static int raw_setsockopt(struct sock *sk, int level, int optname,
397                           char __user *optval, unsigned int optlen)
398 {
399         return -EOPNOTSUPP;
400 }
401 
402 static struct proto ieee802154_raw_prot = {
403         .name           = "IEEE-802.15.4-RAW",
404         .owner          = THIS_MODULE,
405         .obj_size       = sizeof(struct sock),
406         .close          = raw_close,
407         .bind           = raw_bind,
408         .sendmsg        = raw_sendmsg,
409         .recvmsg        = raw_recvmsg,
410         .hash           = raw_hash,
411         .unhash         = raw_unhash,
412         .connect        = raw_connect,
413         .disconnect     = raw_disconnect,
414         .getsockopt     = raw_getsockopt,
415         .setsockopt     = raw_setsockopt,
416 };
417 
418 static const struct proto_ops ieee802154_raw_ops = {
419         .family            = PF_IEEE802154,
420         .owner             = THIS_MODULE,
421         .release           = ieee802154_sock_release,
422         .bind              = ieee802154_sock_bind,
423         .connect           = ieee802154_sock_connect,
424         .socketpair        = sock_no_socketpair,
425         .accept            = sock_no_accept,
426         .getname           = sock_no_getname,
427         .poll              = datagram_poll,
428         .ioctl             = ieee802154_sock_ioctl,
429         .listen            = sock_no_listen,
430         .shutdown          = sock_no_shutdown,
431         .setsockopt        = sock_common_setsockopt,
432         .getsockopt        = sock_common_getsockopt,
433         .sendmsg           = ieee802154_sock_sendmsg,
434         .recvmsg           = sock_common_recvmsg,
435         .mmap              = sock_no_mmap,
436         .sendpage          = sock_no_sendpage,
437 #ifdef CONFIG_COMPAT
438         .compat_setsockopt = compat_sock_common_setsockopt,
439         .compat_getsockopt = compat_sock_common_getsockopt,
440 #endif
441 };
442 
443 /* DGRAM Sockets (802.15.4 dataframes) */
444 static HLIST_HEAD(dgram_head);
445 static DEFINE_RWLOCK(dgram_lock);
446 
447 struct dgram_sock {
448         struct sock sk;
449 
450         struct ieee802154_addr src_addr;
451         struct ieee802154_addr dst_addr;
452 
453         unsigned int bound:1;
454         unsigned int connected:1;
455         unsigned int want_ack:1;
456         unsigned int secen:1;
457         unsigned int secen_override:1;
458         unsigned int seclevel:3;
459         unsigned int seclevel_override:1;
460 };
461 
462 static inline struct dgram_sock *dgram_sk(const struct sock *sk)
463 {
464         return container_of(sk, struct dgram_sock, sk);
465 }
466 
467 static int dgram_hash(struct sock *sk)
468 {
469         write_lock_bh(&dgram_lock);
470         sk_add_node(sk, &dgram_head);
471         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
472         write_unlock_bh(&dgram_lock);
473 
474         return 0;
475 }
476 
477 static void dgram_unhash(struct sock *sk)
478 {
479         write_lock_bh(&dgram_lock);
480         if (sk_del_node_init(sk))
481                 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
482         write_unlock_bh(&dgram_lock);
483 }
484 
485 static int dgram_init(struct sock *sk)
486 {
487         struct dgram_sock *ro = dgram_sk(sk);
488 
489         ro->want_ack = 1;
490         return 0;
491 }
492 
493 static void dgram_close(struct sock *sk, long timeout)
494 {
495         sk_common_release(sk);
496 }
497 
498 static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len)
499 {
500         struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
501         struct ieee802154_addr haddr;
502         struct dgram_sock *ro = dgram_sk(sk);
503         int err = -EINVAL;
504         struct net_device *dev;
505 
506         lock_sock(sk);
507 
508         ro->bound = 0;
509 
510         if (len < sizeof(*addr))
511                 goto out;
512 
513         if (addr->family != AF_IEEE802154)
514                 goto out;
515 
516         ieee802154_addr_from_sa(&haddr, &addr->addr);
517         dev = ieee802154_get_dev(sock_net(sk), &haddr);
518         if (!dev) {
519                 err = -ENODEV;
520                 goto out;
521         }
522 
523         if (dev->type != ARPHRD_IEEE802154) {
524                 err = -ENODEV;
525                 goto out_put;
526         }
527 
528         ro->src_addr = haddr;
529 
530         ro->bound = 1;
531         err = 0;
532 out_put:
533         dev_put(dev);
534 out:
535         release_sock(sk);
536 
537         return err;
538 }
539 
540 static int dgram_ioctl(struct sock *sk, int cmd, unsigned long arg)
541 {
542         switch (cmd) {
543         case SIOCOUTQ:
544         {
545                 int amount = sk_wmem_alloc_get(sk);
546 
547                 return put_user(amount, (int __user *)arg);
548         }
549 
550         case SIOCINQ:
551         {
552                 struct sk_buff *skb;
553                 unsigned long amount;
554 
555                 amount = 0;
556                 spin_lock_bh(&sk->sk_receive_queue.lock);
557                 skb = skb_peek(&sk->sk_receive_queue);
558                 if (skb) {
559                         /* We will only return the amount
560                          * of this packet since that is all
561                          * that will be read.
562                          */
563                         amount = skb->len - ieee802154_hdr_length(skb);
564                 }
565                 spin_unlock_bh(&sk->sk_receive_queue.lock);
566                 return put_user(amount, (int __user *)arg);
567         }
568         }
569 
570         return -ENOIOCTLCMD;
571 }
572 
573 /* FIXME: autobind */
574 static int dgram_connect(struct sock *sk, struct sockaddr *uaddr,
575                          int len)
576 {
577         struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
578         struct dgram_sock *ro = dgram_sk(sk);
579         int err = 0;
580 
581         if (len < sizeof(*addr))
582                 return -EINVAL;
583 
584         if (addr->family != AF_IEEE802154)
585                 return -EINVAL;
586 
587         lock_sock(sk);
588 
589         if (!ro->bound) {
590                 err = -ENETUNREACH;
591                 goto out;
592         }
593 
594         ieee802154_addr_from_sa(&ro->dst_addr, &addr->addr);
595         ro->connected = 1;
596 
597 out:
598         release_sock(sk);
599         return err;
600 }
601 
602 static int dgram_disconnect(struct sock *sk, int flags)
603 {
604         struct dgram_sock *ro = dgram_sk(sk);
605 
606         lock_sock(sk);
607         ro->connected = 0;
608         release_sock(sk);
609 
610         return 0;
611 }
612 
613 static int dgram_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
614 {
615         struct net_device *dev;
616         unsigned int mtu;
617         struct sk_buff *skb;
618         struct ieee802154_mac_cb *cb;
619         struct dgram_sock *ro = dgram_sk(sk);
620         struct ieee802154_addr dst_addr;
621         int hlen, tlen;
622         int err;
623 
624         if (msg->msg_flags & MSG_OOB) {
625                 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
626                 return -EOPNOTSUPP;
627         }
628 
629         if (!ro->connected && !msg->msg_name)
630                 return -EDESTADDRREQ;
631         else if (ro->connected && msg->msg_name)
632                 return -EISCONN;
633 
634         if (!ro->bound)
635                 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
636         else
637                 dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr);
638 
639         if (!dev) {
640                 pr_debug("no dev\n");
641                 err = -ENXIO;
642                 goto out;
643         }
644         mtu = IEEE802154_MTU;
645         pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
646 
647         if (size > mtu) {
648                 pr_debug("size = %Zu, mtu = %u\n", size, mtu);
649                 err = -EMSGSIZE;
650                 goto out_dev;
651         }
652 
653         hlen = LL_RESERVED_SPACE(dev);
654         tlen = dev->needed_tailroom;
655         skb = sock_alloc_send_skb(sk, hlen + tlen + size,
656                                   msg->msg_flags & MSG_DONTWAIT,
657                                   &err);
658         if (!skb)
659                 goto out_dev;
660 
661         skb_reserve(skb, hlen);
662 
663         skb_reset_network_header(skb);
664 
665         cb = mac_cb_init(skb);
666         cb->type = IEEE802154_FC_TYPE_DATA;
667         cb->ackreq = ro->want_ack;
668 
669         if (msg->msg_name) {
670                 DECLARE_SOCKADDR(struct sockaddr_ieee802154*,
671                                  daddr, msg->msg_name);
672 
673                 ieee802154_addr_from_sa(&dst_addr, &daddr->addr);
674         } else {
675                 dst_addr = ro->dst_addr;
676         }
677 
678         cb->secen = ro->secen;
679         cb->secen_override = ro->secen_override;
680         cb->seclevel = ro->seclevel;
681         cb->seclevel_override = ro->seclevel_override;
682 
683         err = wpan_dev_hard_header(skb, dev, &dst_addr,
684                                    ro->bound ? &ro->src_addr : NULL, size);
685         if (err < 0)
686                 goto out_skb;
687 
688         err = memcpy_from_msg(skb_put(skb, size), msg, size);
689         if (err < 0)
690                 goto out_skb;
691 
692         skb->dev = dev;
693         skb->sk  = sk;
694         skb->protocol = htons(ETH_P_IEEE802154);
695 
696         dev_put(dev);
697 
698         err = dev_queue_xmit(skb);
699         if (err > 0)
700                 err = net_xmit_errno(err);
701 
702         return err ?: size;
703 
704 out_skb:
705         kfree_skb(skb);
706 out_dev:
707         dev_put(dev);
708 out:
709         return err;
710 }
711 
712 static int dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
713                          int noblock, int flags, int *addr_len)
714 {
715         size_t copied = 0;
716         int err = -EOPNOTSUPP;
717         struct sk_buff *skb;
718         DECLARE_SOCKADDR(struct sockaddr_ieee802154 *, saddr, msg->msg_name);
719 
720         skb = skb_recv_datagram(sk, flags, noblock, &err);
721         if (!skb)
722                 goto out;
723 
724         copied = skb->len;
725         if (len < copied) {
726                 msg->msg_flags |= MSG_TRUNC;
727                 copied = len;
728         }
729 
730         /* FIXME: skip headers if necessary ?! */
731         err = skb_copy_datagram_msg(skb, 0, msg, copied);
732         if (err)
733                 goto done;
734 
735         sock_recv_ts_and_drops(msg, sk, skb);
736 
737         if (saddr) {
738                 /* Clear the implicit padding in struct sockaddr_ieee802154
739                  * (16 bits between 'family' and 'addr') and in struct
740                  * ieee802154_addr_sa (16 bits at the end of the structure).
741                  */
742                 memset(saddr, 0, sizeof(*saddr));
743 
744                 saddr->family = AF_IEEE802154;
745                 ieee802154_addr_to_sa(&saddr->addr, &mac_cb(skb)->source);
746                 *addr_len = sizeof(*saddr);
747         }
748 
749         if (flags & MSG_TRUNC)
750                 copied = skb->len;
751 done:
752         skb_free_datagram(sk, skb);
753 out:
754         if (err)
755                 return err;
756         return copied;
757 }
758 
759 static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb)
760 {
761         skb = skb_share_check(skb, GFP_ATOMIC);
762         if (!skb)
763                 return NET_RX_DROP;
764 
765         if (sock_queue_rcv_skb(sk, skb) < 0) {
766                 kfree_skb(skb);
767                 return NET_RX_DROP;
768         }
769 
770         return NET_RX_SUCCESS;
771 }
772 
773 static inline bool
774 ieee802154_match_sock(__le64 hw_addr, __le16 pan_id, __le16 short_addr,
775                       struct dgram_sock *ro)
776 {
777         if (!ro->bound)
778                 return true;
779 
780         if (ro->src_addr.mode == IEEE802154_ADDR_LONG &&
781             hw_addr == ro->src_addr.extended_addr)
782                 return true;
783 
784         if (ro->src_addr.mode == IEEE802154_ADDR_SHORT &&
785             pan_id == ro->src_addr.pan_id &&
786             short_addr == ro->src_addr.short_addr)
787                 return true;
788 
789         return false;
790 }
791 
792 static int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb)
793 {
794         struct sock *sk, *prev = NULL;
795         int ret = NET_RX_SUCCESS;
796         __le16 pan_id, short_addr;
797         __le64 hw_addr;
798 
799         /* Data frame processing */
800         BUG_ON(dev->type != ARPHRD_IEEE802154);
801 
802         pan_id = dev->ieee802154_ptr->pan_id;
803         short_addr = dev->ieee802154_ptr->short_addr;
804         hw_addr = dev->ieee802154_ptr->extended_addr;
805 
806         read_lock(&dgram_lock);
807         sk_for_each(sk, &dgram_head) {
808                 if (ieee802154_match_sock(hw_addr, pan_id, short_addr,
809                                           dgram_sk(sk))) {
810                         if (prev) {
811                                 struct sk_buff *clone;
812 
813                                 clone = skb_clone(skb, GFP_ATOMIC);
814                                 if (clone)
815                                         dgram_rcv_skb(prev, clone);
816                         }
817 
818                         prev = sk;
819                 }
820         }
821 
822         if (prev) {
823                 dgram_rcv_skb(prev, skb);
824         } else {
825                 kfree_skb(skb);
826                 ret = NET_RX_DROP;
827         }
828         read_unlock(&dgram_lock);
829 
830         return ret;
831 }
832 
833 static int dgram_getsockopt(struct sock *sk, int level, int optname,
834                             char __user *optval, int __user *optlen)
835 {
836         struct dgram_sock *ro = dgram_sk(sk);
837 
838         int val, len;
839 
840         if (level != SOL_IEEE802154)
841                 return -EOPNOTSUPP;
842 
843         if (get_user(len, optlen))
844                 return -EFAULT;
845 
846         len = min_t(unsigned int, len, sizeof(int));
847 
848         switch (optname) {
849         case WPAN_WANTACK:
850                 val = ro->want_ack;
851                 break;
852         case WPAN_SECURITY:
853                 if (!ro->secen_override)
854                         val = WPAN_SECURITY_DEFAULT;
855                 else if (ro->secen)
856                         val = WPAN_SECURITY_ON;
857                 else
858                         val = WPAN_SECURITY_OFF;
859                 break;
860         case WPAN_SECURITY_LEVEL:
861                 if (!ro->seclevel_override)
862                         val = WPAN_SECURITY_LEVEL_DEFAULT;
863                 else
864                         val = ro->seclevel;
865                 break;
866         default:
867                 return -ENOPROTOOPT;
868         }
869 
870         if (put_user(len, optlen))
871                 return -EFAULT;
872         if (copy_to_user(optval, &val, len))
873                 return -EFAULT;
874         return 0;
875 }
876 
877 static int dgram_setsockopt(struct sock *sk, int level, int optname,
878                             char __user *optval, unsigned int optlen)
879 {
880         struct dgram_sock *ro = dgram_sk(sk);
881         struct net *net = sock_net(sk);
882         int val;
883         int err = 0;
884 
885         if (optlen < sizeof(int))
886                 return -EINVAL;
887 
888         if (get_user(val, (int __user *)optval))
889                 return -EFAULT;
890 
891         lock_sock(sk);
892 
893         switch (optname) {
894         case WPAN_WANTACK:
895                 ro->want_ack = !!val;
896                 break;
897         case WPAN_SECURITY:
898                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
899                     !ns_capable(net->user_ns, CAP_NET_RAW)) {
900                         err = -EPERM;
901                         break;
902                 }
903 
904                 switch (val) {
905                 case WPAN_SECURITY_DEFAULT:
906                         ro->secen_override = 0;
907                         break;
908                 case WPAN_SECURITY_ON:
909                         ro->secen_override = 1;
910                         ro->secen = 1;
911                         break;
912                 case WPAN_SECURITY_OFF:
913                         ro->secen_override = 1;
914                         ro->secen = 0;
915                         break;
916                 default:
917                         err = -EINVAL;
918                         break;
919                 }
920                 break;
921         case WPAN_SECURITY_LEVEL:
922                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
923                     !ns_capable(net->user_ns, CAP_NET_RAW)) {
924                         err = -EPERM;
925                         break;
926                 }
927 
928                 if (val < WPAN_SECURITY_LEVEL_DEFAULT ||
929                     val > IEEE802154_SCF_SECLEVEL_ENC_MIC128) {
930                         err = -EINVAL;
931                 } else if (val == WPAN_SECURITY_LEVEL_DEFAULT) {
932                         ro->seclevel_override = 0;
933                 } else {
934                         ro->seclevel_override = 1;
935                         ro->seclevel = val;
936                 }
937                 break;
938         default:
939                 err = -ENOPROTOOPT;
940                 break;
941         }
942 
943         release_sock(sk);
944         return err;
945 }
946 
947 static struct proto ieee802154_dgram_prot = {
948         .name           = "IEEE-802.15.4-MAC",
949         .owner          = THIS_MODULE,
950         .obj_size       = sizeof(struct dgram_sock),
951         .init           = dgram_init,
952         .close          = dgram_close,
953         .bind           = dgram_bind,
954         .sendmsg        = dgram_sendmsg,
955         .recvmsg        = dgram_recvmsg,
956         .hash           = dgram_hash,
957         .unhash         = dgram_unhash,
958         .connect        = dgram_connect,
959         .disconnect     = dgram_disconnect,
960         .ioctl          = dgram_ioctl,
961         .getsockopt     = dgram_getsockopt,
962         .setsockopt     = dgram_setsockopt,
963 };
964 
965 static const struct proto_ops ieee802154_dgram_ops = {
966         .family            = PF_IEEE802154,
967         .owner             = THIS_MODULE,
968         .release           = ieee802154_sock_release,
969         .bind              = ieee802154_sock_bind,
970         .connect           = ieee802154_sock_connect,
971         .socketpair        = sock_no_socketpair,
972         .accept            = sock_no_accept,
973         .getname           = sock_no_getname,
974         .poll              = datagram_poll,
975         .ioctl             = ieee802154_sock_ioctl,
976         .listen            = sock_no_listen,
977         .shutdown          = sock_no_shutdown,
978         .setsockopt        = sock_common_setsockopt,
979         .getsockopt        = sock_common_getsockopt,
980         .sendmsg           = ieee802154_sock_sendmsg,
981         .recvmsg           = sock_common_recvmsg,
982         .mmap              = sock_no_mmap,
983         .sendpage          = sock_no_sendpage,
984 #ifdef CONFIG_COMPAT
985         .compat_setsockopt = compat_sock_common_setsockopt,
986         .compat_getsockopt = compat_sock_common_getsockopt,
987 #endif
988 };
989 
990 /* Create a socket. Initialise the socket, blank the addresses
991  * set the state.
992  */
993 static int ieee802154_create(struct net *net, struct socket *sock,
994                              int protocol, int kern)
995 {
996         struct sock *sk;
997         int rc;
998         struct proto *proto;
999         const struct proto_ops *ops;
1000 
1001         if (!net_eq(net, &init_net))
1002                 return -EAFNOSUPPORT;
1003 
1004         switch (sock->type) {
1005         case SOCK_RAW:
1006                 proto = &ieee802154_raw_prot;
1007                 ops = &ieee802154_raw_ops;
1008                 break;
1009         case SOCK_DGRAM:
1010                 proto = &ieee802154_dgram_prot;
1011                 ops = &ieee802154_dgram_ops;
1012                 break;
1013         default:
1014                 rc = -ESOCKTNOSUPPORT;
1015                 goto out;
1016         }
1017 
1018         rc = -ENOMEM;
1019         sk = sk_alloc(net, PF_IEEE802154, GFP_KERNEL, proto, kern);
1020         if (!sk)
1021                 goto out;
1022         rc = 0;
1023 
1024         sock->ops = ops;
1025 
1026         sock_init_data(sock, sk);
1027         /* FIXME: sk->sk_destruct */
1028         sk->sk_family = PF_IEEE802154;
1029 
1030         /* Checksums on by default */
1031         sock_set_flag(sk, SOCK_ZAPPED);
1032 
1033         if (sk->sk_prot->hash) {
1034                 rc = sk->sk_prot->hash(sk);
1035                 if (rc) {
1036                         sk_common_release(sk);
1037                         goto out;
1038                 }
1039         }
1040 
1041         if (sk->sk_prot->init) {
1042                 rc = sk->sk_prot->init(sk);
1043                 if (rc)
1044                         sk_common_release(sk);
1045         }
1046 out:
1047         return rc;
1048 }
1049 
1050 static const struct net_proto_family ieee802154_family_ops = {
1051         .family         = PF_IEEE802154,
1052         .create         = ieee802154_create,
1053         .owner          = THIS_MODULE,
1054 };
1055 
1056 static int ieee802154_rcv(struct sk_buff *skb, struct net_device *dev,
1057                           struct packet_type *pt, struct net_device *orig_dev)
1058 {
1059         if (!netif_running(dev))
1060                 goto drop;
1061         pr_debug("got frame, type %d, dev %p\n", dev->type, dev);
1062 #ifdef DEBUG
1063         print_hex_dump_bytes("ieee802154_rcv ",
1064                              DUMP_PREFIX_NONE, skb->data, skb->len);
1065 #endif
1066 
1067         if (!net_eq(dev_net(dev), &init_net))
1068                 goto drop;
1069 
1070         ieee802154_raw_deliver(dev, skb);
1071 
1072         if (dev->type != ARPHRD_IEEE802154)
1073                 goto drop;
1074 
1075         if (skb->pkt_type != PACKET_OTHERHOST)
1076                 return ieee802154_dgram_deliver(dev, skb);
1077 
1078 drop:
1079         kfree_skb(skb);
1080         return NET_RX_DROP;
1081 }
1082 
1083 static struct packet_type ieee802154_packet_type = {
1084         .type = htons(ETH_P_IEEE802154),
1085         .func = ieee802154_rcv,
1086 };
1087 
1088 static int __init af_ieee802154_init(void)
1089 {
1090         int rc = -EINVAL;
1091 
1092         rc = proto_register(&ieee802154_raw_prot, 1);
1093         if (rc)
1094                 goto out;
1095 
1096         rc = proto_register(&ieee802154_dgram_prot, 1);
1097         if (rc)
1098                 goto err_dgram;
1099 
1100         /* Tell SOCKET that we are alive */
1101         rc = sock_register(&ieee802154_family_ops);
1102         if (rc)
1103                 goto err_sock;
1104         dev_add_pack(&ieee802154_packet_type);
1105 
1106         rc = 0;
1107         goto out;
1108 
1109 err_sock:
1110         proto_unregister(&ieee802154_dgram_prot);
1111 err_dgram:
1112         proto_unregister(&ieee802154_raw_prot);
1113 out:
1114         return rc;
1115 }
1116 
1117 static void __exit af_ieee802154_remove(void)
1118 {
1119         dev_remove_pack(&ieee802154_packet_type);
1120         sock_unregister(PF_IEEE802154);
1121         proto_unregister(&ieee802154_dgram_prot);
1122         proto_unregister(&ieee802154_raw_prot);
1123 }
1124 
1125 module_init(af_ieee802154_init);
1126 module_exit(af_ieee802154_remove);
1127 
1128 MODULE_LICENSE("GPL");
1129 MODULE_ALIAS_NETPROTO(PF_IEEE802154);
1130 

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