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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 | |
34 | static HLIST_HEAD(raw_head); |
35 | static DEFINE_RWLOCK(raw_lock); |
36 | |
37 | static 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 | |
45 | static 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 | |
53 | static void raw_close(struct sock *sk, long timeout) |
54 | { |
55 | sk_common_release(sk); |
56 | } |
57 | |
58 | static 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 | |
86 | out_put: |
87 | dev_put(dev); |
88 | out: |
89 | release_sock(sk); |
90 | |
91 | return err; |
92 | } |
93 | |
94 | static int raw_connect(struct sock *sk, struct sockaddr *uaddr, |
95 | int addr_len) |
96 | { |
97 | return -ENOTSUPP; |
98 | } |
99 | |
100 | static int raw_disconnect(struct sock *sk, int flags) |
101 | { |
102 | return 0; |
103 | } |
104 | |
105 | static 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 | |
169 | out_skb: |
170 | kfree_skb(skb); |
171 | out_dev: |
172 | dev_put(dev); |
173 | out: |
174 | return err; |
175 | } |
176 | |
177 | static 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; |
202 | done: |
203 | skb_free_datagram(sk, skb); |
204 | out: |
205 | if (err) |
206 | return err; |
207 | return copied; |
208 | } |
209 | |
210 | static 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 | |
221 | void ieee802154_raw_deliver(struct net_device *dev, struct sk_buff *skb) |
222 | { |
223 | struct sock *sk; |
224 | |
225 | read_lock(&raw_lock); |
226 | sk_for_each(sk, &raw_head) { |
227 | bh_lock_sock(sk); |
228 | if (!sk->sk_bound_dev_if || |
229 | sk->sk_bound_dev_if == dev->ifindex) { |
230 | |
231 | struct sk_buff *clone; |
232 | |
233 | clone = skb_clone(skb, GFP_ATOMIC); |
234 | if (clone) |
235 | raw_rcv_skb(sk, clone); |
236 | } |
237 | bh_unlock_sock(sk); |
238 | } |
239 | read_unlock(&raw_lock); |
240 | } |
241 | |
242 | static int raw_getsockopt(struct sock *sk, int level, int optname, |
243 | char __user *optval, int __user *optlen) |
244 | { |
245 | return -EOPNOTSUPP; |
246 | } |
247 | |
248 | static int raw_setsockopt(struct sock *sk, int level, int optname, |
249 | char __user *optval, unsigned int optlen) |
250 | { |
251 | return -EOPNOTSUPP; |
252 | } |
253 | |
254 | struct proto ieee802154_raw_prot = { |
255 | .name = "IEEE-802.15.4-RAW", |
256 | .owner = THIS_MODULE, |
257 | .obj_size = sizeof(struct sock), |
258 | .close = raw_close, |
259 | .bind = raw_bind, |
260 | .sendmsg = raw_sendmsg, |
261 | .recvmsg = raw_recvmsg, |
262 | .hash = raw_hash, |
263 | .unhash = raw_unhash, |
264 | .connect = raw_connect, |
265 | .disconnect = raw_disconnect, |
266 | .getsockopt = raw_getsockopt, |
267 | .setsockopt = raw_setsockopt, |
268 | }; |
269 | |
270 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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