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
cmtp_sock_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)66 static int cmtp_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
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 void __user *argp = (void __user *)arg;
74 int err;
75
76 BT_DBG("cmd %x arg %lx", cmd, arg);
77
78 switch (cmd) {
79 case CMTPCONNADD:
80 if (!capable(CAP_NET_ADMIN))
81 return -EPERM;
82
83 if (copy_from_user(&ca, argp, sizeof(ca)))
84 return -EFAULT;
85
86 nsock = sockfd_lookup(ca.sock, &err);
87 if (!nsock)
88 return err;
89
90 if (nsock->sk->sk_state != BT_CONNECTED) {
91 sockfd_put(nsock);
92 return -EBADFD;
93 }
94
95 err = cmtp_add_connection(&ca, nsock);
96 if (!err) {
97 if (copy_to_user(argp, &ca, sizeof(ca)))
98 err = -EFAULT;
99 } else
100 sockfd_put(nsock);
101
102 return err;
103
104 case CMTPCONNDEL:
105 if (!capable(CAP_NET_ADMIN))
106 return -EPERM;
107
108 if (copy_from_user(&cd, argp, sizeof(cd)))
109 return -EFAULT;
110
111 return cmtp_del_connection(&cd);
112
113 case CMTPGETCONNLIST:
114 if (copy_from_user(&cl, argp, sizeof(cl)))
115 return -EFAULT;
116
117 if (cl.cnum <= 0)
118 return -EINVAL;
119
120 err = cmtp_get_connlist(&cl);
121 if (!err && copy_to_user(argp, &cl, sizeof(cl)))
122 return -EFAULT;
123
124 return err;
125
126 case CMTPGETCONNINFO:
127 if (copy_from_user(&ci, argp, sizeof(ci)))
128 return -EFAULT;
129
130 err = cmtp_get_conninfo(&ci);
131 if (!err && copy_to_user(argp, &ci, sizeof(ci)))
132 return -EFAULT;
133
134 return err;
135 }
136
137 return -EINVAL;
138 }
139
140 #ifdef CONFIG_COMPAT
cmtp_sock_compat_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)141 static int cmtp_sock_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
142 {
143 if (cmd == CMTPGETCONNLIST) {
144 struct cmtp_connlist_req cl;
145 u32 uci;
146 int err;
147
148 if (get_user(cl.cnum, (u32 __user *) arg) ||
149 get_user(uci, (u32 __user *) (arg + 4)))
150 return -EFAULT;
151
152 cl.ci = compat_ptr(uci);
153
154 if (cl.cnum <= 0)
155 return -EINVAL;
156
157 err = cmtp_get_connlist(&cl);
158
159 if (!err && put_user(cl.cnum, (u32 __user *) arg))
160 err = -EFAULT;
161
162 return err;
163 }
164
165 return cmtp_sock_ioctl(sock, cmd, arg);
166 }
167 #endif
168
169 static const struct proto_ops cmtp_sock_ops = {
170 .family = PF_BLUETOOTH,
171 .owner = THIS_MODULE,
172 .release = cmtp_sock_release,
173 .ioctl = cmtp_sock_ioctl,
174 #ifdef CONFIG_COMPAT
175 .compat_ioctl = cmtp_sock_compat_ioctl,
176 #endif
177 .bind = sock_no_bind,
178 .getname = sock_no_getname,
179 .sendmsg = sock_no_sendmsg,
180 .recvmsg = sock_no_recvmsg,
181 .listen = sock_no_listen,
182 .shutdown = sock_no_shutdown,
183 .setsockopt = sock_no_setsockopt,
184 .getsockopt = sock_no_getsockopt,
185 .connect = sock_no_connect,
186 .socketpair = sock_no_socketpair,
187 .accept = sock_no_accept,
188 .mmap = sock_no_mmap
189 };
190
191 static struct proto cmtp_proto = {
192 .name = "CMTP",
193 .owner = THIS_MODULE,
194 .obj_size = sizeof(struct bt_sock)
195 };
196
cmtp_sock_create(struct net * net,struct socket * sock,int protocol,int kern)197 static int cmtp_sock_create(struct net *net, struct socket *sock, int protocol,
198 int kern)
199 {
200 struct sock *sk;
201
202 BT_DBG("sock %p", sock);
203
204 if (sock->type != SOCK_RAW)
205 return -ESOCKTNOSUPPORT;
206
207 sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &cmtp_proto, kern);
208 if (!sk)
209 return -ENOMEM;
210
211 sock_init_data(sock, sk);
212
213 sock->ops = &cmtp_sock_ops;
214
215 sock->state = SS_UNCONNECTED;
216
217 sock_reset_flag(sk, SOCK_ZAPPED);
218
219 sk->sk_protocol = protocol;
220 sk->sk_state = BT_OPEN;
221
222 bt_sock_link(&cmtp_sk_list, sk);
223
224 return 0;
225 }
226
227 static const struct net_proto_family cmtp_sock_family_ops = {
228 .family = PF_BLUETOOTH,
229 .owner = THIS_MODULE,
230 .create = cmtp_sock_create
231 };
232
cmtp_init_sockets(void)233 int cmtp_init_sockets(void)
234 {
235 int err;
236
237 err = proto_register(&cmtp_proto, 0);
238 if (err < 0)
239 return err;
240
241 err = bt_sock_register(BTPROTO_CMTP, &cmtp_sock_family_ops);
242 if (err < 0) {
243 BT_ERR("Can't register CMTP socket");
244 goto error;
245 }
246
247 err = bt_procfs_init(&init_net, "cmtp", &cmtp_sk_list, NULL);
248 if (err < 0) {
249 BT_ERR("Failed to create CMTP proc file");
250 bt_sock_unregister(BTPROTO_HIDP);
251 goto error;
252 }
253
254 BT_INFO("CMTP socket layer initialized");
255
256 return 0;
257
258 error:
259 proto_unregister(&cmtp_proto);
260 return err;
261 }
262
cmtp_cleanup_sockets(void)263 void cmtp_cleanup_sockets(void)
264 {
265 bt_procfs_cleanup(&init_net, "cmtp");
266 bt_sock_unregister(BTPROTO_CMTP);
267 proto_unregister(&cmtp_proto);
268 }
269
