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

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