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Linux/net/ieee802154/af_ieee802154.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  * You should have received a copy of the GNU General Public License along
 16  * with this program; if not, write to the Free Software Foundation, Inc.,
 17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Written by:
 20  * Sergey Lapin <slapin@ossfans.org>
 21  * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
 22  */
 23 
 24 #include <linux/net.h>
 25 #include <linux/capability.h>
 26 #include <linux/module.h>
 27 #include <linux/if_arp.h>
 28 #include <linux/if.h>
 29 #include <linux/termios.h>      /* For TIOCOUTQ/INQ */
 30 #include <linux/list.h>
 31 #include <linux/slab.h>
 32 #include <net/datalink.h>
 33 #include <net/psnap.h>
 34 #include <net/sock.h>
 35 #include <net/tcp_states.h>
 36 #include <net/route.h>
 37 
 38 #include <net/af_ieee802154.h>
 39 #include <net/ieee802154_netdev.h>
 40 
 41 #include "af802154.h"
 42 
 43 /*
 44  * Utility function for families
 45  */
 46 struct net_device *ieee802154_get_dev(struct net *net,
 47                 struct ieee802154_addr *addr)
 48 {
 49         struct net_device *dev = NULL;
 50         struct net_device *tmp;
 51         u16 pan_id, short_addr;
 52 
 53         switch (addr->addr_type) {
 54         case IEEE802154_ADDR_LONG:
 55                 rcu_read_lock();
 56                 dev = dev_getbyhwaddr_rcu(net, ARPHRD_IEEE802154, addr->hwaddr);
 57                 if (dev)
 58                         dev_hold(dev);
 59                 rcu_read_unlock();
 60                 break;
 61         case IEEE802154_ADDR_SHORT:
 62                 if (addr->pan_id == 0xffff ||
 63                     addr->short_addr == IEEE802154_ADDR_UNDEF ||
 64                     addr->short_addr == 0xffff)
 65                         break;
 66 
 67                 rtnl_lock();
 68 
 69                 for_each_netdev(net, tmp) {
 70                         if (tmp->type != ARPHRD_IEEE802154)
 71                                 continue;
 72 
 73                         pan_id = ieee802154_mlme_ops(tmp)->get_pan_id(tmp);
 74                         short_addr =
 75                                 ieee802154_mlme_ops(tmp)->get_short_addr(tmp);
 76 
 77                         if (pan_id == addr->pan_id &&
 78                             short_addr == addr->short_addr) {
 79                                 dev = tmp;
 80                                 dev_hold(dev);
 81                                 break;
 82                         }
 83                 }
 84 
 85                 rtnl_unlock();
 86                 break;
 87         default:
 88                 pr_warning("Unsupported ieee802154 address type: %d\n",
 89                                 addr->addr_type);
 90                 break;
 91         }
 92 
 93         return dev;
 94 }
 95 
 96 static int ieee802154_sock_release(struct socket *sock)
 97 {
 98         struct sock *sk = sock->sk;
 99 
100         if (sk) {
101                 sock->sk = NULL;
102                 sk->sk_prot->close(sk, 0);
103         }
104         return 0;
105 }
106 static int ieee802154_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
107                 struct msghdr *msg, size_t len)
108 {
109         struct sock *sk = sock->sk;
110 
111         return sk->sk_prot->sendmsg(iocb, sk, msg, len);
112 }
113 
114 static int ieee802154_sock_bind(struct socket *sock, struct sockaddr *uaddr,
115                 int addr_len)
116 {
117         struct sock *sk = sock->sk;
118 
119         if (sk->sk_prot->bind)
120                 return sk->sk_prot->bind(sk, uaddr, addr_len);
121 
122         return sock_no_bind(sock, uaddr, addr_len);
123 }
124 
125 static int ieee802154_sock_connect(struct socket *sock, struct sockaddr *uaddr,
126                         int addr_len, int flags)
127 {
128         struct sock *sk = sock->sk;
129 
130         if (addr_len < sizeof(uaddr->sa_family))
131                 return -EINVAL;
132 
133         if (uaddr->sa_family == AF_UNSPEC)
134                 return sk->sk_prot->disconnect(sk, flags);
135 
136         return sk->sk_prot->connect(sk, uaddr, addr_len);
137 }
138 
139 static int ieee802154_dev_ioctl(struct sock *sk, struct ifreq __user *arg,
140                 unsigned int cmd)
141 {
142         struct ifreq ifr;
143         int ret = -ENOIOCTLCMD;
144         struct net_device *dev;
145 
146         if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
147                 return -EFAULT;
148 
149         ifr.ifr_name[IFNAMSIZ-1] = 0;
150 
151         dev_load(sock_net(sk), ifr.ifr_name);
152         dev = dev_get_by_name(sock_net(sk), ifr.ifr_name);
153 
154         if (!dev)
155                 return -ENODEV;
156 
157         if (dev->type == ARPHRD_IEEE802154 && dev->netdev_ops->ndo_do_ioctl)
158                 ret = dev->netdev_ops->ndo_do_ioctl(dev, &ifr, cmd);
159 
160         if (!ret && copy_to_user(arg, &ifr, sizeof(struct ifreq)))
161                 ret = -EFAULT;
162         dev_put(dev);
163 
164         return ret;
165 }
166 
167 static int ieee802154_sock_ioctl(struct socket *sock, unsigned int cmd,
168                 unsigned long arg)
169 {
170         struct sock *sk = sock->sk;
171 
172         switch (cmd) {
173         case SIOCGSTAMP:
174                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
175         case SIOCGSTAMPNS:
176                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
177         case SIOCGIFADDR:
178         case SIOCSIFADDR:
179                 return ieee802154_dev_ioctl(sk, (struct ifreq __user *)arg,
180                                 cmd);
181         default:
182                 if (!sk->sk_prot->ioctl)
183                         return -ENOIOCTLCMD;
184                 return sk->sk_prot->ioctl(sk, cmd, arg);
185         }
186 }
187 
188 static const struct proto_ops ieee802154_raw_ops = {
189         .family            = PF_IEEE802154,
190         .owner             = THIS_MODULE,
191         .release           = ieee802154_sock_release,
192         .bind              = ieee802154_sock_bind,
193         .connect           = ieee802154_sock_connect,
194         .socketpair        = sock_no_socketpair,
195         .accept            = sock_no_accept,
196         .getname           = sock_no_getname,
197         .poll              = datagram_poll,
198         .ioctl             = ieee802154_sock_ioctl,
199         .listen            = sock_no_listen,
200         .shutdown          = sock_no_shutdown,
201         .setsockopt        = sock_common_setsockopt,
202         .getsockopt        = sock_common_getsockopt,
203         .sendmsg           = ieee802154_sock_sendmsg,
204         .recvmsg           = sock_common_recvmsg,
205         .mmap              = sock_no_mmap,
206         .sendpage          = sock_no_sendpage,
207 #ifdef CONFIG_COMPAT
208         .compat_setsockopt = compat_sock_common_setsockopt,
209         .compat_getsockopt = compat_sock_common_getsockopt,
210 #endif
211 };
212 
213 static const struct proto_ops ieee802154_dgram_ops = {
214         .family            = PF_IEEE802154,
215         .owner             = THIS_MODULE,
216         .release           = ieee802154_sock_release,
217         .bind              = ieee802154_sock_bind,
218         .connect           = ieee802154_sock_connect,
219         .socketpair        = sock_no_socketpair,
220         .accept            = sock_no_accept,
221         .getname           = sock_no_getname,
222         .poll              = datagram_poll,
223         .ioctl             = ieee802154_sock_ioctl,
224         .listen            = sock_no_listen,
225         .shutdown          = sock_no_shutdown,
226         .setsockopt        = sock_common_setsockopt,
227         .getsockopt        = sock_common_getsockopt,
228         .sendmsg           = ieee802154_sock_sendmsg,
229         .recvmsg           = sock_common_recvmsg,
230         .mmap              = sock_no_mmap,
231         .sendpage          = sock_no_sendpage,
232 #ifdef CONFIG_COMPAT
233         .compat_setsockopt = compat_sock_common_setsockopt,
234         .compat_getsockopt = compat_sock_common_getsockopt,
235 #endif
236 };
237 
238 
239 /*
240  * Create a socket. Initialise the socket, blank the addresses
241  * set the state.
242  */
243 static int ieee802154_create(struct net *net, struct socket *sock,
244                              int protocol, int kern)
245 {
246         struct sock *sk;
247         int rc;
248         struct proto *proto;
249         const struct proto_ops *ops;
250 
251         if (!net_eq(net, &init_net))
252                 return -EAFNOSUPPORT;
253 
254         switch (sock->type) {
255         case SOCK_RAW:
256                 proto = &ieee802154_raw_prot;
257                 ops = &ieee802154_raw_ops;
258                 break;
259         case SOCK_DGRAM:
260                 proto = &ieee802154_dgram_prot;
261                 ops = &ieee802154_dgram_ops;
262                 break;
263         default:
264                 rc = -ESOCKTNOSUPPORT;
265                 goto out;
266         }
267 
268         rc = -ENOMEM;
269         sk = sk_alloc(net, PF_IEEE802154, GFP_KERNEL, proto);
270         if (!sk)
271                 goto out;
272         rc = 0;
273 
274         sock->ops = ops;
275 
276         sock_init_data(sock, sk);
277         /* FIXME: sk->sk_destruct */
278         sk->sk_family = PF_IEEE802154;
279 
280         /* Checksums on by default */
281         sock_set_flag(sk, SOCK_ZAPPED);
282 
283         if (sk->sk_prot->hash)
284                 sk->sk_prot->hash(sk);
285 
286         if (sk->sk_prot->init) {
287                 rc = sk->sk_prot->init(sk);
288                 if (rc)
289                         sk_common_release(sk);
290         }
291 out:
292         return rc;
293 }
294 
295 static const struct net_proto_family ieee802154_family_ops = {
296         .family         = PF_IEEE802154,
297         .create         = ieee802154_create,
298         .owner          = THIS_MODULE,
299 };
300 
301 static int ieee802154_rcv(struct sk_buff *skb, struct net_device *dev,
302         struct packet_type *pt, struct net_device *orig_dev)
303 {
304         if (!netif_running(dev))
305                 goto drop;
306         pr_debug("got frame, type %d, dev %p\n", dev->type, dev);
307 #ifdef DEBUG
308         print_hex_dump_bytes("ieee802154_rcv ", DUMP_PREFIX_NONE, skb->data, skb->len);
309 #endif
310 
311         if (!net_eq(dev_net(dev), &init_net))
312                 goto drop;
313 
314         ieee802154_raw_deliver(dev, skb);
315 
316         if (dev->type != ARPHRD_IEEE802154)
317                 goto drop;
318 
319         if (skb->pkt_type != PACKET_OTHERHOST)
320                 return ieee802154_dgram_deliver(dev, skb);
321 
322 drop:
323         kfree_skb(skb);
324         return NET_RX_DROP;
325 }
326 
327 
328 static struct packet_type ieee802154_packet_type = {
329         .type = __constant_htons(ETH_P_IEEE802154),
330         .func = ieee802154_rcv,
331 };
332 
333 static int __init af_ieee802154_init(void)
334 {
335         int rc = -EINVAL;
336 
337         rc = proto_register(&ieee802154_raw_prot, 1);
338         if (rc)
339                 goto out;
340 
341         rc = proto_register(&ieee802154_dgram_prot, 1);
342         if (rc)
343                 goto err_dgram;
344 
345         /* Tell SOCKET that we are alive */
346         rc = sock_register(&ieee802154_family_ops);
347         if (rc)
348                 goto err_sock;
349         dev_add_pack(&ieee802154_packet_type);
350 
351         rc = 0;
352         goto out;
353 
354 err_sock:
355         proto_unregister(&ieee802154_dgram_prot);
356 err_dgram:
357         proto_unregister(&ieee802154_raw_prot);
358 out:
359         return rc;
360 }
361 static void __exit af_ieee802154_remove(void)
362 {
363         dev_remove_pack(&ieee802154_packet_type);
364         sock_unregister(PF_IEEE802154);
365         proto_unregister(&ieee802154_dgram_prot);
366         proto_unregister(&ieee802154_raw_prot);
367 }
368 
369 module_init(af_ieee802154_init);
370 module_exit(af_ieee802154_remove);
371 
372 MODULE_LICENSE("GPL");
373 MODULE_ALIAS_NETPROTO(PF_IEEE802154);
374 

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