summaryrefslogtreecommitdiffstats
path: root/net/ieee802154/raw.c
blob: 13198859982e64baf80b97463af6e0b70bc75a50 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
/*
 * Raw IEEE 802.15.4 sockets
 *
 * Copyright 2007, 2008 Siemens AG
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Written by:
 * Sergey Lapin <slapin@ossfans.org>
 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
 */

#include <linux/net.h>
#include <linux/module.h>
#include <linux/if_arp.h>
#include <linux/list.h>
#include <net/sock.h>
#include <net/af_ieee802154.h>

#include "af802154.h"

static HLIST_HEAD(raw_head);
static DEFINE_RWLOCK(raw_lock);

static void raw_hash(struct sock *sk)
{
	write_lock_bh(&raw_lock);
	sk_add_node(sk, &raw_head);
	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
	write_unlock_bh(&raw_lock);
}

static void raw_unhash(struct sock *sk)
{
	write_lock_bh(&raw_lock);
	if (sk_del_node_init(sk))
		sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
	write_unlock_bh(&raw_lock);
}

static void raw_close(struct sock *sk, long timeout)
{
	sk_common_release(sk);
}

static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int len)
{
	struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
	int err = 0;
	struct net_device *dev = NULL;

	if (len < sizeof(*addr))
		return -EINVAL;

	if (addr->family != AF_IEEE802154)
		return -EINVAL;

	lock_sock(sk);

	dev = ieee802154_get_dev(sock_net(sk), &addr->addr);
	if (!dev) {
		err = -ENODEV;
		goto out;
	}

	if (dev->type != ARPHRD_IEEE802154) {
		err = -ENODEV;
		goto out_put;
	}

	sk->sk_bound_dev_if = dev->ifindex;
	sk_dst_reset(sk);

out_put:
	dev_put(dev);
out:
	release_sock(sk);

	return err;
}

static int raw_connect(struct sock *sk, struct sockaddr *uaddr,
			int addr_len)
{
	return -ENOTSUPP;
}

static int raw_disconnect(struct sock *sk, int flags)
{
	return 0;
}

static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
		       size_t size)
{
	struct net_device *dev;
	unsigned mtu;
	struct sk_buff *skb;
	int err;

	if (msg->msg_flags & MSG_OOB) {
		pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
		return -EOPNOTSUPP;
	}

	lock_sock(sk);
	if (!sk->sk_bound_dev_if)
		dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
	else
		dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if);
	release_sock(sk);

	if (!dev) {
		pr_debug("no dev\n");
		err = -ENXIO;
		goto out;
	}

	mtu = dev->mtu;
	pr_debug("name = %s, mtu = %u\n", dev->name, mtu);

	if (size > mtu) {
		pr_debug("size = %Zu, mtu = %u\n", size, mtu);
		err = -EINVAL;
		goto out_dev;
	}

	skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + size,
			msg->msg_flags & MSG_DONTWAIT, &err);
	if (!skb)
		goto out_dev;

	skb_reserve(skb, LL_RESERVED_SPACE(dev));

	skb_reset_mac_header(skb);
	skb_reset_network_header(skb);

	err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
	if (err < 0)
		goto out_skb;

	skb->dev = dev;
	skb->sk  = sk;
	skb->protocol = htons(ETH_P_IEEE802154);

	dev_put(dev);

	err = dev_queue_xmit(skb);
	if (err > 0)
		err = net_xmit_errno(err);

	return err ?: size;

out_skb:
	kfree_skb(skb);
out_dev:
	dev_put(dev);
out:
	return err;
}

static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
		       size_t len, int noblock, int flags, int *addr_len)
{
	size_t copied = 0;
	int err = -EOPNOTSUPP;
	struct sk_buff *skb;

	skb = skb_recv_datagram(sk, flags, noblock, &err);
	if (!skb)
		goto out;

	copied = skb->len;
	if (len < copied) {
		msg->msg_flags |= MSG_TRUNC;
		copied = len;
	}

	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
	if (err)
		goto done;

	sock_recv_timestamp(msg, sk, skb);

	if (flags & MSG_TRUNC)
		copied = skb->len;
done:
	skb_free_datagram(sk, skb);
out:
	if (err)
		return err;
	return copied;
}

static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
	if (sock_queue_rcv_skb(sk, skb) < 0) {
		atomic_inc(&sk->sk_drops);
		kfree_skb(skb);
		return NET_RX_DROP;
	}

	return NET_RX_SUCCESS;
}


void ieee802154_raw_deliver(struct net_device *dev, struct sk_buff *skb)
{
	struct sock *sk;
	struct hlist_node *node;

	read_lock(&raw_lock);
	sk_for_each(sk, node, &raw_head) {
		bh_lock_sock(sk);
		if (!sk->sk_bound_dev_if ||
		    sk->sk_bound_dev_if == dev->ifindex) {

			struct sk_buff *clone;

			clone = skb_clone(skb, GFP_ATOMIC);
			if (clone)
				raw_rcv_skb(sk, clone);
		}
		bh_unlock_sock(sk);
	}
	read_unlock(&raw_lock);
}

static int raw_getsockopt(struct sock *sk, int level, int optname,
		    char __user *optval, int __user *optlen)
{
	return -EOPNOTSUPP;
}

static int raw_setsockopt(struct sock *sk, int level, int optname,
		    char __user *optval, int optlen)
{
	return -EOPNOTSUPP;
}

struct proto ieee802154_raw_prot = {
	.name		= "IEEE-802.15.4-RAW",
	.owner		= THIS_MODULE,
	.obj_size	= sizeof(struct sock),
	.close		= raw_close,
	.bind		= raw_bind,
	.sendmsg	= raw_sendmsg,
	.recvmsg	= raw_recvmsg,
	.hash		= raw_hash,
	.unhash		= raw_unhash,
	.connect	= raw_connect,
	.disconnect	= raw_disconnect,
	.getsockopt	= raw_getsockopt,
	.setsockopt	= raw_setsockopt,
};