1 /*
2 CMTP implementation for Linux Bluetooth stack (BlueZ).
3 Copyright (C) 2002-2003 Marcel Holtmann <marcel@holtmann.org>
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License version 2 as
7 published by the Free Software Foundation;
8
9 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
10 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
11 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
12 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
13 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
14 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17
18 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
19 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
20 SOFTWARE IS DISCLAIMED.
21 */
22
23 #include <linux/export.h>
24
25 #include <linux/types.h>
26 #include <linux/capability.h>
27 #include <linux/errno.h>
28 #include <linux/kernel.h>
29 #include <linux/poll.h>
30 #include <linux/fcntl.h>
31 #include <linux/skbuff.h>
32 #include <linux/socket.h>
33 #include <linux/ioctl.h>
34 #include <linux/file.h>
35 #include <linux/compat.h>
36 #include <linux/gfp.h>
37 #include <linux/uaccess.h>
38 #include <net/sock.h>
39
40 #include <linux/isdn/capilli.h>
41
42
43 #include "cmtp.h"
44
45 static struct bt_sock_list cmtp_sk_list = {
46 .lock = __RW_LOCK_UNLOCKED(cmtp_sk_list.lock)
47 };
48
49 static int cmtp_sock_release(struct socket *sock)
50 {
51 struct sock *sk = sock->sk;
52
53 BT_DBG("sock %p sk %p", sock, sk);
54
55 if (!sk)
56 return 0;
57
58 bt_sock_unlink(&cmtp_sk_list, sk);
59
60 sock_orphan(sk);
61 sock_put(sk);
62
63 return 0;
64 }
65
66 static int do_cmtp_sock_ioctl(struct socket *sock, unsigned int cmd, void __user *argp)
67 {
68 struct cmtp_connadd_req ca;
69 struct cmtp_conndel_req cd;
70 struct cmtp_connlist_req cl;
71 struct cmtp_conninfo ci;
72 struct socket *nsock;
73 int err;
74
75 BT_DBG("cmd %x arg %p", cmd, argp);
76
77 switch (cmd) {
78 case CMTPCONNADD:
79 if (!capable(CAP_NET_ADMIN))
80 return -EPERM;
81
82 if (copy_from_user(&ca, argp, sizeof(ca)))
83 return -EFAULT;
84
85 nsock = sockfd_lookup(ca.sock, &err);
86 if (!nsock)
87 return err;
88
89 if (nsock->sk->sk_state != BT_CONNECTED) {
90 sockfd_put(nsock);
91 return -EBADFD;
92 }
93
94 err = cmtp_add_connection(&ca, nsock);
95 if (!err) {
96 if (copy_to_user(argp, &ca, sizeof(ca)))
97 err = -EFAULT;
98 } else
99 sockfd_put(nsock);
100
101 return err;
102
103 case CMTPCONNDEL:
104 if (!capable(CAP_NET_ADMIN))
105 return -EPERM;
106
107 if (copy_from_user(&cd, argp, sizeof(cd)))
108 return -EFAULT;
109
110 return cmtp_del_connection(&cd);
111
112 case CMTPGETCONNLIST:
113 if (copy_from_user(&cl, argp, sizeof(cl)))
114 return -EFAULT;
115
116 if (cl.cnum <= 0)
117 return -EINVAL;
118
119 err = cmtp_get_connlist(&cl);
120 if (!err && copy_to_user(argp, &cl, sizeof(cl)))
121 return -EFAULT;
122
123 return err;
124
125 case CMTPGETCONNINFO:
126 if (copy_from_user(&ci, argp, sizeof(ci)))
127 return -EFAULT;
128
129 err = cmtp_get_conninfo(&ci);
130 if (!err && copy_to_user(argp, &ci, sizeof(ci)))
131 return -EFAULT;
132
133 return err;
134 }
135
136 return -EINVAL;
137 }
138
139 static int cmtp_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
140 {
141 return do_cmtp_sock_ioctl(sock, cmd, (void __user *)arg);
142 }
143
144 #ifdef CONFIG_COMPAT
145 static int cmtp_sock_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
146 {
147 void __user *argp = compat_ptr(arg);
148 if (cmd == CMTPGETCONNLIST) {
149 struct cmtp_connlist_req cl;
150 u32 __user *p = argp;
151 u32 uci;
152 int err;
153
154 if (get_user(cl.cnum, p) || get_user(uci, p + 1))
155 return -EFAULT;
156
157 cl.ci = compat_ptr(uci);
158
159 if (cl.cnum <= 0)
160 return -EINVAL;
161
162 err = cmtp_get_connlist(&cl);
163
164 if (!err && put_user(cl.cnum, p))
165 err = -EFAULT;
166
167 return err;
168 }
169
170 return do_cmtp_sock_ioctl(sock, cmd, argp);
171 }
172 #endif
173
174 static const struct proto_ops cmtp_sock_ops = {
175 .family = PF_BLUETOOTH,
176 .owner = THIS_MODULE,
177 .release = cmtp_sock_release,
178 .ioctl = cmtp_sock_ioctl,
179 #ifdef CONFIG_COMPAT
180 .compat_ioctl = cmtp_sock_compat_ioctl,
181 #endif
182 .bind = sock_no_bind,
183 .getname = sock_no_getname,
184 .sendmsg = sock_no_sendmsg,
185 .recvmsg = sock_no_recvmsg,
186 .listen = sock_no_listen,
187 .shutdown = sock_no_shutdown,
188 .connect = sock_no_connect,
189 .socketpair = sock_no_socketpair,
190 .accept = sock_no_accept,
191 .mmap = sock_no_mmap
192 };
193
194 static struct proto cmtp_proto = {
195 .name = "CMTP",
196 .owner = THIS_MODULE,
197 .obj_size = sizeof(struct bt_sock)
198 };
199
200 static int cmtp_sock_create(struct net *net, struct socket *sock, int protocol,
201 int kern)
202 {
203 struct sock *sk;
204
205 BT_DBG("sock %p", sock);
206
207 if (sock->type != SOCK_RAW)
208 return -ESOCKTNOSUPPORT;
209
210 sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &cmtp_proto, kern);
211 if (!sk)
212 return -ENOMEM;
213
214 sock_init_data(sock, sk);
215
216 sock->ops = &cmtp_sock_ops;
217
218 sock->state = SS_UNCONNECTED;
219
220 sock_reset_flag(sk, SOCK_ZAPPED);
221
222 sk->sk_protocol = protocol;
223 sk->sk_state = BT_OPEN;
224
225 bt_sock_link(&cmtp_sk_list, sk);
226
227 return 0;
228 }
229
230 static const struct net_proto_family cmtp_sock_family_ops = {
231 .family = PF_BLUETOOTH,
232 .owner = THIS_MODULE,
233 .create = cmtp_sock_create
234 };
235
236 int cmtp_init_sockets(void)
237 {
238 int err;
239
240 err = proto_register(&cmtp_proto, 0);
241 if (err < 0)
242 return err;
243
244 err = bt_sock_register(BTPROTO_CMTP, &cmtp_sock_family_ops);
245 if (err < 0) {
246 BT_ERR("Can't register CMTP socket");
247 goto error;
248 }
249
250 err = bt_procfs_init(&init_net, "cmtp", &cmtp_sk_list, NULL);
251 if (err < 0) {
252 BT_ERR("Failed to create CMTP proc file");
253 bt_sock_unregister(BTPROTO_HIDP);
254 goto error;
255 }
256
257 BT_INFO("CMTP socket layer initialized");
258
259 return 0;
260
261 error:
262 proto_unregister(&cmtp_proto);
263 return err;
264 }
265
266 void cmtp_cleanup_sockets(void)
267 {
268 bt_procfs_cleanup(&init_net, "cmtp");
269 bt_sock_unregister(BTPROTO_CMTP);
270 proto_unregister(&cmtp_proto);
271 }
272
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