Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Raw IEEE 802.15.4 sockets
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 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
22 */
23
24#include <linux/net.h>
25#include <linux/module.h>
26#include <linux/if_arp.h>
27#include <linux/list.h>
28#include <linux/slab.h>
29#include <net/sock.h>
30#include <net/af_ieee802154.h>
31
32#include "af802154.h"
33
34static HLIST_HEAD(raw_head);
35static DEFINE_RWLOCK(raw_lock);
36
37static void raw_hash(struct sock *sk)
38{
39 write_lock_bh(&raw_lock);
40 sk_add_node(sk, &raw_head);
41 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
42 write_unlock_bh(&raw_lock);
43}
44
45static void raw_unhash(struct sock *sk)
46{
47 write_lock_bh(&raw_lock);
48 if (sk_del_node_init(sk))
49 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
50 write_unlock_bh(&raw_lock);
51}
52
53static void raw_close(struct sock *sk, long timeout)
54{
55 sk_common_release(sk);
56}
57
58static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int len)
59{
60 struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
61 int err = 0;
62 struct net_device *dev = NULL;
63
64 if (len < sizeof(*addr))
65 return -EINVAL;
66
67 if (addr->family != AF_IEEE802154)
68 return -EINVAL;
69
70 lock_sock(sk);
71
72 dev = ieee802154_get_dev(sock_net(sk), &addr->addr);
73 if (!dev) {
74 err = -ENODEV;
75 goto out;
76 }
77
78 if (dev->type != ARPHRD_IEEE802154) {
79 err = -ENODEV;
80 goto out_put;
81 }
82
83 sk->sk_bound_dev_if = dev->ifindex;
84 sk_dst_reset(sk);
85
86out_put:
87 dev_put(dev);
88out:
89 release_sock(sk);
90
91 return err;
92}
93
94static int raw_connect(struct sock *sk, struct sockaddr *uaddr,
95 int addr_len)
96{
97 return -ENOTSUPP;
98}
99
100static int raw_disconnect(struct sock *sk, int flags)
101{
102 return 0;
103}
104
105static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
106 size_t size)
107{
108 struct net_device *dev;
109 unsigned int mtu;
110 struct sk_buff *skb;
111 int hlen, tlen;
112 int err;
113
114 if (msg->msg_flags & MSG_OOB) {
115 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
116 return -EOPNOTSUPP;
117 }
118
119 lock_sock(sk);
120 if (!sk->sk_bound_dev_if)
121 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
122 else
123 dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if);
124 release_sock(sk);
125
126 if (!dev) {
127 pr_debug("no dev\n");
128 err = -ENXIO;
129 goto out;
130 }
131
132 mtu = dev->mtu;
133 pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
134
135 if (size > mtu) {
136 pr_debug("size = %Zu, mtu = %u\n", size, mtu);
137 err = -EINVAL;
138 goto out_dev;
139 }
140
141 hlen = LL_RESERVED_SPACE(dev);
142 tlen = dev->needed_tailroom;
143 skb = sock_alloc_send_skb(sk, hlen + tlen + size,
144 msg->msg_flags & MSG_DONTWAIT, &err);
145 if (!skb)
146 goto out_dev;
147
148 skb_reserve(skb, hlen);
149
150 skb_reset_mac_header(skb);
151 skb_reset_network_header(skb);
152
153 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
154 if (err < 0)
155 goto out_skb;
156
157 skb->dev = dev;
158 skb->sk = sk;
159 skb->protocol = htons(ETH_P_IEEE802154);
160
161 dev_put(dev);
162
163 err = dev_queue_xmit(skb);
164 if (err > 0)
165 err = net_xmit_errno(err);
166
167 return err ?: size;
168
169out_skb:
170 kfree_skb(skb);
171out_dev:
172 dev_put(dev);
173out:
174 return err;
175}
176
177static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
178 size_t len, int noblock, int flags, int *addr_len)
179{
180 size_t copied = 0;
181 int err = -EOPNOTSUPP;
182 struct sk_buff *skb;
183
184 skb = skb_recv_datagram(sk, flags, noblock, &err);
185 if (!skb)
186 goto out;
187
188 copied = skb->len;
189 if (len < copied) {
190 msg->msg_flags |= MSG_TRUNC;
191 copied = len;
192 }
193
194 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
195 if (err)
196 goto done;
197
198 sock_recv_ts_and_drops(msg, sk, skb);
199
200 if (flags & MSG_TRUNC)
201 copied = skb->len;
202done:
203 skb_free_datagram(sk, skb);
204out:
205 if (err)
206 return err;
207 return copied;
208}
209
210static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
211{
212 if (sock_queue_rcv_skb(sk, skb) < 0) {
213 kfree_skb(skb);
214 return NET_RX_DROP;
215 }
216
217 return NET_RX_SUCCESS;
218}
219
220
221void ieee802154_raw_deliver(struct net_device *dev, struct sk_buff *skb)
222{
223 struct sock *sk;
224 struct hlist_node *node;
225
226 read_lock(&raw_lock);
227 sk_for_each(sk, node, &raw_head) {
228 bh_lock_sock(sk);
229 if (!sk->sk_bound_dev_if ||
230 sk->sk_bound_dev_if == dev->ifindex) {
231
232 struct sk_buff *clone;
233
234 clone = skb_clone(skb, GFP_ATOMIC);
235 if (clone)
236 raw_rcv_skb(sk, clone);
237 }
238 bh_unlock_sock(sk);
239 }
240 read_unlock(&raw_lock);
241}
242
243static int raw_getsockopt(struct sock *sk, int level, int optname,
244 char __user *optval, int __user *optlen)
245{
246 return -EOPNOTSUPP;
247}
248
249static int raw_setsockopt(struct sock *sk, int level, int optname,
250 char __user *optval, unsigned int optlen)
251{
252 return -EOPNOTSUPP;
253}
254
255struct proto ieee802154_raw_prot = {
256 .name = "IEEE-802.15.4-RAW",
257 .owner = THIS_MODULE,
258 .obj_size = sizeof(struct sock),
259 .close = raw_close,
260 .bind = raw_bind,
261 .sendmsg = raw_sendmsg,
262 .recvmsg = raw_recvmsg,
263 .hash = raw_hash,
264 .unhash = raw_unhash,
265 .connect = raw_connect,
266 .disconnect = raw_disconnect,
267 .getsockopt = raw_getsockopt,
268 .setsockopt = raw_setsockopt,
269};
270