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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> | |
29 | #include <net/ieee802154/af_ieee802154.h> | |
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 | ||
77 | if (dev->type != ARPHRD_IEEE802154_PHY && | |
78 | 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 mtu; | |
110 | struct sk_buff *skb; | |
111 | int err; | |
112 | ||
113 | if (msg->msg_flags & MSG_OOB) { | |
114 | pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags); | |
115 | return -EOPNOTSUPP; | |
116 | } | |
117 | ||
118 | lock_sock(sk); | |
119 | if (!sk->sk_bound_dev_if) | |
120 | dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154); | |
121 | else | |
122 | dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if); | |
123 | release_sock(sk); | |
124 | ||
125 | if (!dev) { | |
126 | pr_debug("no dev\n"); | |
127 | err = -ENXIO; | |
128 | goto out; | |
129 | } | |
130 | ||
131 | mtu = dev->mtu; | |
132 | pr_debug("name = %s, mtu = %u\n", dev->name, mtu); | |
133 | ||
134 | if (size > mtu) { | |
e5241c44 | 135 | pr_debug("size = %Zu, mtu = %u\n", size, mtu); |
9ec76716 SL |
136 | err = -EINVAL; |
137 | goto out_dev; | |
138 | } | |
139 | ||
140 | skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + size, | |
141 | msg->msg_flags & MSG_DONTWAIT, &err); | |
142 | if (!skb) | |
143 | goto out_dev; | |
144 | ||
145 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
146 | ||
147 | skb_reset_mac_header(skb); | |
148 | skb_reset_network_header(skb); | |
149 | ||
150 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); | |
151 | if (err < 0) | |
152 | goto out_skb; | |
153 | ||
154 | skb->dev = dev; | |
155 | skb->sk = sk; | |
156 | skb->protocol = htons(ETH_P_IEEE802154); | |
157 | ||
158 | dev_put(dev); | |
159 | ||
160 | err = dev_queue_xmit(skb); | |
161 | if (err > 0) | |
162 | err = net_xmit_errno(err); | |
163 | ||
164 | return err ?: size; | |
165 | ||
166 | out_skb: | |
167 | kfree_skb(skb); | |
168 | out_dev: | |
169 | dev_put(dev); | |
170 | out: | |
171 | return err; | |
172 | } | |
173 | ||
174 | static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
175 | size_t len, int noblock, int flags, int *addr_len) | |
176 | { | |
177 | size_t copied = 0; | |
178 | int err = -EOPNOTSUPP; | |
179 | struct sk_buff *skb; | |
180 | ||
181 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
182 | if (!skb) | |
183 | goto out; | |
184 | ||
185 | copied = skb->len; | |
186 | if (len < copied) { | |
187 | msg->msg_flags |= MSG_TRUNC; | |
188 | copied = len; | |
189 | } | |
190 | ||
191 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
192 | if (err) | |
193 | goto done; | |
194 | ||
195 | sock_recv_timestamp(msg, sk, skb); | |
196 | ||
197 | if (flags & MSG_TRUNC) | |
198 | copied = skb->len; | |
199 | done: | |
200 | skb_free_datagram(sk, skb); | |
201 | out: | |
202 | if (err) | |
203 | return err; | |
204 | return copied; | |
205 | } | |
206 | ||
207 | static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
208 | { | |
209 | if (sock_queue_rcv_skb(sk, skb) < 0) { | |
210 | atomic_inc(&sk->sk_drops); | |
211 | kfree_skb(skb); | |
212 | return NET_RX_DROP; | |
213 | } | |
214 | ||
215 | return NET_RX_SUCCESS; | |
216 | } | |
217 | ||
218 | ||
219 | void ieee802154_raw_deliver(struct net_device *dev, struct sk_buff *skb) | |
220 | { | |
221 | struct sock *sk; | |
222 | struct hlist_node *node; | |
223 | ||
224 | read_lock(&raw_lock); | |
225 | sk_for_each(sk, node, &raw_head) { | |
226 | bh_lock_sock(sk); | |
227 | if (!sk->sk_bound_dev_if || | |
228 | sk->sk_bound_dev_if == dev->ifindex) { | |
229 | ||
230 | struct sk_buff *clone; | |
231 | ||
232 | clone = skb_clone(skb, GFP_ATOMIC); | |
233 | if (clone) | |
234 | raw_rcv_skb(sk, clone); | |
235 | } | |
236 | bh_unlock_sock(sk); | |
237 | } | |
238 | read_unlock(&raw_lock); | |
239 | } | |
240 | ||
a9dfac33 DES |
241 | static int raw_getsockopt(struct sock *sk, int level, int optname, |
242 | char __user *optval, int __user *optlen) | |
243 | { | |
244 | return -EOPNOTSUPP; | |
245 | } | |
246 | ||
247 | static int raw_setsockopt(struct sock *sk, int level, int optname, | |
248 | char __user *optval, int __user optlen) | |
249 | { | |
250 | return -EOPNOTSUPP; | |
251 | } | |
252 | ||
9ec76716 SL |
253 | struct proto ieee802154_raw_prot = { |
254 | .name = "IEEE-802.15.4-RAW", | |
255 | .owner = THIS_MODULE, | |
256 | .obj_size = sizeof(struct sock), | |
257 | .close = raw_close, | |
258 | .bind = raw_bind, | |
259 | .sendmsg = raw_sendmsg, | |
260 | .recvmsg = raw_recvmsg, | |
261 | .hash = raw_hash, | |
262 | .unhash = raw_unhash, | |
263 | .connect = raw_connect, | |
264 | .disconnect = raw_disconnect, | |
a9dfac33 DES |
265 | .getsockopt = raw_getsockopt, |
266 | .setsockopt = raw_setsockopt, | |
9ec76716 SL |
267 | }; |
268 |