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
cmtp_sock_release(struct socket * sock)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
do_cmtp_sock_ioctl(struct socket * sock,unsigned int cmd,void __user * argp)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
cmtp_sock_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)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
cmtp_sock_compat_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)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 .setsockopt = sock_no_setsockopt,
189 .getsockopt = sock_no_getsockopt,
190 .connect = sock_no_connect,
191 .socketpair = sock_no_socketpair,
192 .accept = sock_no_accept,
193 .mmap = sock_no_mmap
194 };
195
196 static struct proto cmtp_proto = {
197 .name = "CMTP",
198 .owner = THIS_MODULE,
199 .obj_size = sizeof(struct bt_sock)
200 };
201
cmtp_sock_create(struct net * net,struct socket * sock,int protocol,int kern)202 static int cmtp_sock_create(struct net *net, struct socket *sock, int protocol,
203 int kern)
204 {
205 struct sock *sk;
206
207 BT_DBG("sock %p", sock);
208
209 if (sock->type != SOCK_RAW)
210 return -ESOCKTNOSUPPORT;
211
212 sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &cmtp_proto, kern);
213 if (!sk)
214 return -ENOMEM;
215
216 sock_init_data(sock, sk);
217
218 sock->ops = &cmtp_sock_ops;
219
220 sock->state = SS_UNCONNECTED;
221
222 sock_reset_flag(sk, SOCK_ZAPPED);
223
224 sk->sk_protocol = protocol;
225 sk->sk_state = BT_OPEN;
226
227 bt_sock_link(&cmtp_sk_list, sk);
228
229 return 0;
230 }
231
232 static const struct net_proto_family cmtp_sock_family_ops = {
233 .family = PF_BLUETOOTH,
234 .owner = THIS_MODULE,
235 .create = cmtp_sock_create
236 };
237
cmtp_init_sockets(void)238 int cmtp_init_sockets(void)
239 {
240 int err;
241
242 err = proto_register(&cmtp_proto, 0);
243 if (err < 0)
244 return err;
245
246 err = bt_sock_register(BTPROTO_CMTP, &cmtp_sock_family_ops);
247 if (err < 0) {
248 BT_ERR("Can't register CMTP socket");
249 goto error;
250 }
251
252 err = bt_procfs_init(&init_net, "cmtp", &cmtp_sk_list, NULL);
253 if (err < 0) {
254 BT_ERR("Failed to create CMTP proc file");
255 bt_sock_unregister(BTPROTO_HIDP);
256 goto error;
257 }
258
259 BT_INFO("CMTP socket layer initialized");
260
261 return 0;
262
263 error:
264 proto_unregister(&cmtp_proto);
265 return err;
266 }
267
cmtp_cleanup_sockets(void)268 void cmtp_cleanup_sockets(void)
269 {
270 bt_procfs_cleanup(&init_net, "cmtp");
271 bt_sock_unregister(BTPROTO_CMTP);
272 proto_unregister(&cmtp_proto);
273 }
274