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9ec76716 SL |
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 <net/sock.h> | |
f0166e5e | 29 | #include <net/af_ieee802154.h> |
9ec76716 SL |
30 | |
31 | #include "af802154.h" | |
32 | ||
33 | static HLIST_HEAD(raw_head); | |
34 | static DEFINE_RWLOCK(raw_lock); | |
35 | ||
36 | static void raw_hash(struct sock *sk) | |
37 | { | |
38 | write_lock_bh(&raw_lock); | |
39 | sk_add_node(sk, &raw_head); | |
40 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); | |
41 | write_unlock_bh(&raw_lock); | |
42 | } | |
43 | ||
44 | static void raw_unhash(struct sock *sk) | |
45 | { | |
46 | write_lock_bh(&raw_lock); | |
47 | if (sk_del_node_init(sk)) | |
48 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); | |
49 | write_unlock_bh(&raw_lock); | |
50 | } | |
51 | ||
52 | static void raw_close(struct sock *sk, long timeout) | |
53 | { | |
54 | sk_common_release(sk); | |
55 | } | |
56 | ||
57 | static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int len) | |
58 | { | |
59 | struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr; | |
60 | int err = 0; | |
61 | struct net_device *dev = NULL; | |
62 | ||
63 | if (len < sizeof(*addr)) | |
64 | return -EINVAL; | |
65 | ||
66 | if (addr->family != AF_IEEE802154) | |
67 | return -EINVAL; | |
68 | ||
69 | lock_sock(sk); | |
70 | ||
71 | dev = ieee802154_get_dev(sock_net(sk), &addr->addr); | |
72 | if (!dev) { | |
73 | err = -ENODEV; | |
74 | goto out; | |
75 | } | |
76 | ||
929122cd | 77 | if (dev->type != ARPHRD_IEEE802154) { |
9ec76716 SL |
78 | err = -ENODEV; |
79 | goto out_put; | |
80 | } | |
81 | ||
82 | sk->sk_bound_dev_if = dev->ifindex; | |
83 | sk_dst_reset(sk); | |
84 | ||
85 | out_put: | |
86 | dev_put(dev); | |
87 | out: | |
88 | release_sock(sk); | |
89 | ||
90 | return err; | |
91 | } | |
92 | ||
93 | static int raw_connect(struct sock *sk, struct sockaddr *uaddr, | |
94 | int addr_len) | |
95 | { | |
96 | return -ENOTSUPP; | |
97 | } | |
98 | ||
99 | static int raw_disconnect(struct sock *sk, int flags) | |
100 | { | |
101 | return 0; | |
102 | } | |
103 | ||
104 | static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
105 | size_t size) | |
106 | { | |
107 | struct net_device *dev; | |
108 | unsigned mtu; | |
109 | struct sk_buff *skb; | |
110 | int err; | |
111 | ||
112 | if (msg->msg_flags & MSG_OOB) { | |
113 | pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags); | |
114 | return -EOPNOTSUPP; | |
115 | } | |
116 | ||
117 | lock_sock(sk); | |
118 | if (!sk->sk_bound_dev_if) | |
119 | dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154); | |
120 | else | |
121 | dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if); | |
122 | release_sock(sk); | |
123 | ||
124 | if (!dev) { | |
125 | pr_debug("no dev\n"); | |
126 | err = -ENXIO; | |
127 | goto out; | |
128 | } | |
129 | ||
130 | mtu = dev->mtu; | |
131 | pr_debug("name = %s, mtu = %u\n", dev->name, mtu); | |
132 | ||
133 | if (size > mtu) { | |
e5241c44 | 134 | pr_debug("size = %Zu, mtu = %u\n", size, mtu); |
9ec76716 SL |
135 | err = -EINVAL; |
136 | goto out_dev; | |
137 | } | |
138 | ||
139 | skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + size, | |
140 | msg->msg_flags & MSG_DONTWAIT, &err); | |
141 | if (!skb) | |
142 | goto out_dev; | |
143 | ||
144 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
145 | ||
146 | skb_reset_mac_header(skb); | |
147 | skb_reset_network_header(skb); | |
148 | ||
149 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); | |
150 | if (err < 0) | |
151 | goto out_skb; | |
152 | ||
153 | skb->dev = dev; | |
154 | skb->sk = sk; | |
155 | skb->protocol = htons(ETH_P_IEEE802154); | |
156 | ||
157 | dev_put(dev); | |
158 | ||
159 | err = dev_queue_xmit(skb); | |
160 | if (err > 0) | |
161 | err = net_xmit_errno(err); | |
162 | ||
163 | return err ?: size; | |
164 | ||
165 | out_skb: | |
166 | kfree_skb(skb); | |
167 | out_dev: | |
168 | dev_put(dev); | |
169 | out: | |
170 | return err; | |
171 | } | |
172 | ||
173 | static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
174 | size_t len, int noblock, int flags, int *addr_len) | |
175 | { | |
176 | size_t copied = 0; | |
177 | int err = -EOPNOTSUPP; | |
178 | struct sk_buff *skb; | |
179 | ||
180 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
181 | if (!skb) | |
182 | goto out; | |
183 | ||
184 | copied = skb->len; | |
185 | if (len < copied) { | |
186 | msg->msg_flags |= MSG_TRUNC; | |
187 | copied = len; | |
188 | } | |
189 | ||
190 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
191 | if (err) | |
192 | goto done; | |
193 | ||
194 | sock_recv_timestamp(msg, sk, skb); | |
195 | ||
196 | if (flags & MSG_TRUNC) | |
197 | copied = skb->len; | |
198 | done: | |
199 | skb_free_datagram(sk, skb); | |
200 | out: | |
201 | if (err) | |
202 | return err; | |
203 | return copied; | |
204 | } | |
205 | ||
206 | static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
207 | { | |
208 | if (sock_queue_rcv_skb(sk, skb) < 0) { | |
209 | atomic_inc(&sk->sk_drops); | |
210 | kfree_skb(skb); | |
211 | return NET_RX_DROP; | |
212 | } | |
213 | ||
214 | return NET_RX_SUCCESS; | |
215 | } | |
216 | ||
217 | ||
218 | void ieee802154_raw_deliver(struct net_device *dev, struct sk_buff *skb) | |
219 | { | |
220 | struct sock *sk; | |
221 | struct hlist_node *node; | |
222 | ||
223 | read_lock(&raw_lock); | |
224 | sk_for_each(sk, node, &raw_head) { | |
225 | bh_lock_sock(sk); | |
226 | if (!sk->sk_bound_dev_if || | |
227 | sk->sk_bound_dev_if == dev->ifindex) { | |
228 | ||
229 | struct sk_buff *clone; | |
230 | ||
231 | clone = skb_clone(skb, GFP_ATOMIC); | |
232 | if (clone) | |
233 | raw_rcv_skb(sk, clone); | |
234 | } | |
235 | bh_unlock_sock(sk); | |
236 | } | |
237 | read_unlock(&raw_lock); | |
238 | } | |
239 | ||
a9dfac33 DES |
240 | static int raw_getsockopt(struct sock *sk, int level, int optname, |
241 | char __user *optval, int __user *optlen) | |
242 | { | |
243 | return -EOPNOTSUPP; | |
244 | } | |
245 | ||
246 | static int raw_setsockopt(struct sock *sk, int level, int optname, | |
066fc512 | 247 | char __user *optval, int optlen) |
a9dfac33 DES |
248 | { |
249 | return -EOPNOTSUPP; | |
250 | } | |
251 | ||
9ec76716 SL |
252 | struct proto ieee802154_raw_prot = { |
253 | .name = "IEEE-802.15.4-RAW", | |
254 | .owner = THIS_MODULE, | |
255 | .obj_size = sizeof(struct sock), | |
256 | .close = raw_close, | |
257 | .bind = raw_bind, | |
258 | .sendmsg = raw_sendmsg, | |
259 | .recvmsg = raw_recvmsg, | |
260 | .hash = raw_hash, | |
261 | .unhash = raw_unhash, | |
262 | .connect = raw_connect, | |
263 | .disconnect = raw_disconnect, | |
a9dfac33 DES |
264 | .getsockopt = raw_getsockopt, |
265 | .setsockopt = raw_setsockopt, | |
9ec76716 SL |
266 | }; |
267 |