Root/net/ieee802154/raw.c

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
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
242static int raw_getsockopt(struct sock *sk, int level, int optname,
243            char __user *optval, int __user *optlen)
244{
245    return -EOPNOTSUPP;
246}
247
248static int raw_setsockopt(struct sock *sk, int level, int optname,
249            char __user *optval, unsigned int optlen)
250{
251    return -EOPNOTSUPP;
252}
253
254struct 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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