Root/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 */
45struct 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
95static 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}
105static 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
113static 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
124static 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
135static 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
160static 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
181static 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
206static 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 */
236static int ieee802154_create(struct net *net, struct socket *sock,
237        int protocol)
238{
239    struct sock *sk;
240    int rc;
241    struct proto *proto;
242    const struct proto_ops *ops;
243
244    if (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    }
284out:
285    return rc;
286}
287
288static struct net_proto_family ieee802154_family_ops = {
289    .family = PF_IEEE802154,
290    .create = ieee802154_create,
291    .owner = THIS_MODULE,
292};
293
294static 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
315drop:
316    kfree_skb(skb);
317    return NET_RX_DROP;
318}
319
320
321static struct packet_type ieee802154_packet_type = {
322    .type = __constant_htons(ETH_P_IEEE802154),
323    .func = ieee802154_rcv,
324};
325
326static 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
347err_sock:
348    proto_unregister(&ieee802154_dgram_prot);
349err_dgram:
350    proto_unregister(&ieee802154_raw_prot);
351out:
352    return rc;
353}
354static 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
362module_init(af_ieee802154_init);
363module_exit(af_ieee802154_remove);
364
365MODULE_LICENSE("GPL");
366MODULE_ALIAS_NETPROTO(PF_IEEE802154);
367

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