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Linux/net/bluetooth/cmtp/sock.c

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  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         .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 
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 
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 
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 

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