net: use net_eq to compare nets
[linux-2.6.git] / net / ieee802154 / af_ieee802154.c
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 <net/datalink.h>
32 #include <net/psnap.h>
33 #include <net/sock.h>
34 #include <net/tcp_states.h>
35 #include <net/route.h>
36
37 #include <net/af_ieee802154.h>
38 #include <net/ieee802154_netdev.h>
39
40 #include "af802154.h"
41
42 /*
43  * Utility function for families
44  */
45 struct net_device *ieee802154_get_dev(struct net *net,
46                 struct ieee802154_addr *addr)
47 {
48         struct net_device *dev = NULL;
49         struct net_device *tmp;
50         u16 pan_id, short_addr;
51
52         switch (addr->addr_type) {
53         case IEEE802154_ADDR_LONG:
54                 rtnl_lock();
55                 dev = dev_getbyhwaddr(net, ARPHRD_IEEE802154, addr->hwaddr);
56                 if (dev)
57                         dev_hold(dev);
58                 rtnl_unlock();
59                 break;
60         case IEEE802154_ADDR_SHORT:
61                 if (addr->pan_id == 0xffff ||
62                     addr->short_addr == IEEE802154_ADDR_UNDEF ||
63                     addr->short_addr == 0xffff)
64                         break;
65
66                 rtnl_lock();
67
68                 for_each_netdev(net, tmp) {
69                         if (tmp->type != ARPHRD_IEEE802154)
70                                 continue;
71
72                         pan_id = ieee802154_mlme_ops(tmp)->get_pan_id(tmp);
73                         short_addr =
74                                 ieee802154_mlme_ops(tmp)->get_short_addr(tmp);
75
76                         if (pan_id == addr->pan_id &&
77                             short_addr == addr->short_addr) {
78                                 dev = tmp;
79                                 dev_hold(dev);
80                                 break;
81                         }
82                 }
83
84                 rtnl_unlock();
85                 break;
86         default:
87                 pr_warning("Unsupported ieee802154 address type: %d\n",
88                                 addr->addr_type);
89                 break;
90         }
91
92         return dev;
93 }
94
95 static int ieee802154_sock_release(struct socket *sock)
96 {
97         struct sock *sk = sock->sk;
98
99         if (sk) {
100                 sock->sk = NULL;
101                 sk->sk_prot->close(sk, 0);
102         }
103         return 0;
104 }
105 static int ieee802154_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
106                 struct msghdr *msg, size_t len)
107 {
108         struct sock *sk = sock->sk;
109
110         return sk->sk_prot->sendmsg(iocb, sk, msg, len);
111 }
112
113 static int ieee802154_sock_bind(struct socket *sock, struct sockaddr *uaddr,
114                 int addr_len)
115 {
116         struct sock *sk = sock->sk;
117
118         if (sk->sk_prot->bind)
119                 return sk->sk_prot->bind(sk, uaddr, addr_len);
120
121         return sock_no_bind(sock, uaddr, addr_len);
122 }
123
124 static int ieee802154_sock_connect(struct socket *sock, struct sockaddr *uaddr,
125                         int addr_len, int flags)
126 {
127         struct sock *sk = sock->sk;
128
129         if (uaddr->sa_family == AF_UNSPEC)
130                 return sk->sk_prot->disconnect(sk, flags);
131
132         return sk->sk_prot->connect(sk, uaddr, addr_len);
133 }
134
135 static int ieee802154_dev_ioctl(struct sock *sk, struct ifreq __user *arg,
136                 unsigned int cmd)
137 {
138         struct ifreq ifr;
139         int ret = -ENOIOCTLCMD;
140         struct net_device *dev;
141
142         if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
143                 return -EFAULT;
144
145         ifr.ifr_name[IFNAMSIZ-1] = 0;
146
147         dev_load(sock_net(sk), ifr.ifr_name);
148         dev = dev_get_by_name(sock_net(sk), ifr.ifr_name);
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 static const struct proto_ops ieee802154_raw_ops = {
182         .family            = PF_IEEE802154,
183         .owner             = THIS_MODULE,
184         .release           = ieee802154_sock_release,
185         .bind              = ieee802154_sock_bind,
186         .connect           = ieee802154_sock_connect,
187         .socketpair        = sock_no_socketpair,
188         .accept            = sock_no_accept,
189         .getname           = sock_no_getname,
190         .poll              = datagram_poll,
191         .ioctl             = ieee802154_sock_ioctl,
192         .listen            = sock_no_listen,
193         .shutdown          = sock_no_shutdown,
194         .setsockopt        = sock_common_setsockopt,
195         .getsockopt        = sock_common_getsockopt,
196         .sendmsg           = ieee802154_sock_sendmsg,
197         .recvmsg           = sock_common_recvmsg,
198         .mmap              = sock_no_mmap,
199         .sendpage          = sock_no_sendpage,
200 #ifdef CONFIG_COMPAT
201         .compat_setsockopt = compat_sock_common_setsockopt,
202         .compat_getsockopt = compat_sock_common_getsockopt,
203 #endif
204 };
205
206 static const struct proto_ops ieee802154_dgram_ops = {
207         .family            = PF_IEEE802154,
208         .owner             = THIS_MODULE,
209         .release           = ieee802154_sock_release,
210         .bind              = ieee802154_sock_bind,
211         .connect           = ieee802154_sock_connect,
212         .socketpair        = sock_no_socketpair,
213         .accept            = sock_no_accept,
214         .getname           = sock_no_getname,
215         .poll              = datagram_poll,
216         .ioctl             = ieee802154_sock_ioctl,
217         .listen            = sock_no_listen,
218         .shutdown          = sock_no_shutdown,
219         .setsockopt        = sock_common_setsockopt,
220         .getsockopt        = sock_common_getsockopt,
221         .sendmsg           = ieee802154_sock_sendmsg,
222         .recvmsg           = sock_common_recvmsg,
223         .mmap              = sock_no_mmap,
224         .sendpage          = sock_no_sendpage,
225 #ifdef CONFIG_COMPAT
226         .compat_setsockopt = compat_sock_common_setsockopt,
227         .compat_getsockopt = compat_sock_common_getsockopt,
228 #endif
229 };
230
231
232 /*
233  * Create a socket. Initialise the socket, blank the addresses
234  * set the state.
235  */
236 static int ieee802154_create(struct net *net, struct socket *sock,
237                              int protocol, int kern)
238 {
239         struct sock *sk;
240         int rc;
241         struct proto *proto;
242         const struct proto_ops *ops;
243
244         if (!net_eq(net, &init_net))
245                 return -EAFNOSUPPORT;
246
247         switch (sock->type) {
248         case SOCK_RAW:
249                 proto = &ieee802154_raw_prot;
250                 ops = &ieee802154_raw_ops;
251                 break;
252         case SOCK_DGRAM:
253                 proto = &ieee802154_dgram_prot;
254                 ops = &ieee802154_dgram_ops;
255                 break;
256         default:
257                 rc = -ESOCKTNOSUPPORT;
258                 goto out;
259         }
260
261         rc = -ENOMEM;
262         sk = sk_alloc(net, PF_IEEE802154, GFP_KERNEL, proto);
263         if (!sk)
264                 goto out;
265         rc = 0;
266
267         sock->ops = ops;
268
269         sock_init_data(sock, sk);
270         /* FIXME: sk->sk_destruct */
271         sk->sk_family = PF_IEEE802154;
272
273         /* Checksums on by default */
274         sock_set_flag(sk, SOCK_ZAPPED);
275
276         if (sk->sk_prot->hash)
277                 sk->sk_prot->hash(sk);
278
279         if (sk->sk_prot->init) {
280                 rc = sk->sk_prot->init(sk);
281                 if (rc)
282                         sk_common_release(sk);
283         }
284 out:
285         return rc;
286 }
287
288 static const struct net_proto_family ieee802154_family_ops = {
289         .family         = PF_IEEE802154,
290         .create         = ieee802154_create,
291         .owner          = THIS_MODULE,
292 };
293
294 static int ieee802154_rcv(struct sk_buff *skb, struct net_device *dev,
295         struct packet_type *pt, struct net_device *orig_dev)
296 {
297         if (!netif_running(dev))
298                 return -ENODEV;
299         pr_debug("got frame, type %d, dev %p\n", dev->type, dev);
300 #ifdef DEBUG
301         print_hex_dump_bytes("ieee802154_rcv ", DUMP_PREFIX_NONE, skb->data, skb->len);
302 #endif
303
304         if (!net_eq(dev_net(dev), &init_net))
305                 goto drop;
306
307         ieee802154_raw_deliver(dev, skb);
308
309         if (dev->type != ARPHRD_IEEE802154)
310                 goto drop;
311
312         if (skb->pkt_type != PACKET_OTHERHOST)
313                 return ieee802154_dgram_deliver(dev, skb);
314
315 drop:
316         kfree_skb(skb);
317         return NET_RX_DROP;
318 }
319
320
321 static struct packet_type ieee802154_packet_type = {
322         .type = __constant_htons(ETH_P_IEEE802154),
323         .func = ieee802154_rcv,
324 };
325
326 static int __init af_ieee802154_init(void)
327 {
328         int rc = -EINVAL;
329
330         rc = proto_register(&ieee802154_raw_prot, 1);
331         if (rc)
332                 goto out;
333
334         rc = proto_register(&ieee802154_dgram_prot, 1);
335         if (rc)
336                 goto err_dgram;
337
338         /* Tell SOCKET that we are alive */
339         rc = sock_register(&ieee802154_family_ops);
340         if (rc)
341                 goto err_sock;
342         dev_add_pack(&ieee802154_packet_type);
343
344         rc = 0;
345         goto out;
346
347 err_sock:
348         proto_unregister(&ieee802154_dgram_prot);
349 err_dgram:
350         proto_unregister(&ieee802154_raw_prot);
351 out:
352         return rc;
353 }
354 static void __exit af_ieee802154_remove(void)
355 {
356         dev_remove_pack(&ieee802154_packet_type);
357         sock_unregister(PF_IEEE802154);
358         proto_unregister(&ieee802154_dgram_prot);
359         proto_unregister(&ieee802154_raw_prot);
360 }
361
362 module_init(af_ieee802154_init);
363 module_exit(af_ieee802154_remove);
364
365 MODULE_LICENSE("GPL");
366 MODULE_ALIAS_NETPROTO(PF_IEEE802154);