net/bluetooth/cmtp/sock.c

   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/module.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/sched.h>
  30 #include <linux/slab.h>
  31 #include <linux/poll.h>
  32 #include <linux/fcntl.h>
  33 #include <linux/skbuff.h>
  34 #include <linux/socket.h>
  35 #include <linux/ioctl.h>
  36 #include <linux/file.h>
  37 #include <linux/compat.h>
  38 #include <net/sock.h>
  39
  40 #include <linux/isdn/capilli.h>
  41
  42 #include <asm/system.h>
  43 #include <asm/uaccess.h>
  44
  45 #include "cmtp.h"
  46
  47 #ifndef CONFIG_BT_CMTP_DEBUG
  48 #undef  BT_DBG
  49 #define BT_DBG(D...)
  50 #endif
  51
  52 static int cmtp_sock_release(struct socket *sock)
  53 {
  54         struct sock *sk = sock->sk;
  55
  56         BT_DBG("sock %p sk %p", sock, sk);
  57
  58         if (!sk)
  59                 return 0;
  60
  61         sock_orphan(sk);
  62         sock_put(sk);
  63
  64         return 0;
  65 }
  66
  67 static int cmtp_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
  68 {
  69         struct cmtp_connadd_req ca;
  70         struct cmtp_conndel_req cd;
  71         struct cmtp_connlist_req cl;
  72         struct cmtp_conninfo ci;
  73         struct socket *nsock;
  74         void __user *argp = (void __user *)arg;
  75         int err;
  76
  77         BT_DBG("cmd %x arg %lx", cmd, arg);
  78
  79         switch (cmd) {
  80         case CMTPCONNADD:
  81                 if (!capable(CAP_NET_ADMIN))
  82                         return -EACCES;
  83
  84                 if (copy_from_user(&ca, argp, sizeof(ca)))
  85                         return -EFAULT;
  86
  87                 nsock = sockfd_lookup(ca.sock, &err);
  88                 if (!nsock)
  89                         return err;
  90
  91                 if (nsock->sk->sk_state != BT_CONNECTED) {
  92                         fput(nsock->file);
  93                         return -EBADFD;
  94                 }
  95
  96                 err = cmtp_add_connection(&ca, nsock);
  97                 if (!err) {
  98                         if (copy_to_user(argp, &ca, sizeof(ca)))
  99                                 err = -EFAULT;
 100                 } else
 101                         fput(nsock->file);
 102
 103                 return err;
 104
 105         case CMTPCONNDEL:
 106                 if (!capable(CAP_NET_ADMIN))
 107                         return -EACCES;
 108
 109                 if (copy_from_user(&cd, argp, sizeof(cd)))
 110                         return -EFAULT;
 111
 112                 return cmtp_del_connection(&cd);
 113
 114         case CMTPGETCONNLIST:
 115                 if (copy_from_user(&cl, argp, sizeof(cl)))
 116                         return -EFAULT;
 117
 118                 if (cl.cnum <= 0)
 119                         return -EINVAL;
 120
 121                 err = cmtp_get_connlist(&cl);
 122                 if (!err && copy_to_user(argp, &cl, sizeof(cl)))
 123                         return -EFAULT;
 124
 125                 return err;
 126
 127         case CMTPGETCONNINFO:
 128                 if (copy_from_user(&ci, argp, sizeof(ci)))
 129                         return -EFAULT;
 130
 131                 err = cmtp_get_conninfo(&ci);
 132                 if (!err && copy_to_user(argp, &ci, sizeof(ci)))
 133                         return -EFAULT;
 134
 135                 return err;
 136         }
 137
 138         return -EINVAL;
 139 }
 140
 141 #ifdef CONFIG_COMPAT
 142 static int cmtp_sock_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 143 {
 144         if (cmd == CMTPGETCONNLIST) {
 145                 struct cmtp_connlist_req cl;
 146                 uint32_t uci;
 147                 int err;
 148
 149                 if (get_user(cl.cnum, (uint32_t __user *) arg) ||
 150                                 get_user(uci, (u32 __user *) (arg + 4)))
 151                         return -EFAULT;
 152
 153                 cl.ci = compat_ptr(uci);
 154
 155                 if (cl.cnum <= 0)
 156                         return -EINVAL;
 157
 158                 err = cmtp_get_connlist(&cl);
 159
 160                 if (!err && put_user(cl.cnum, (uint32_t __user *) arg))
 161                         err = -EFAULT;
 162
 163                 return err;
 164         }
 165
 166         return cmtp_sock_ioctl(sock, cmd, arg);
 167 }
 168 #endif
 169
 170 static const struct proto_ops cmtp_sock_ops = {
 171         .family         = PF_BLUETOOTH,
 172         .owner          = THIS_MODULE,
 173         .release        = cmtp_sock_release,
 174         .ioctl          = cmtp_sock_ioctl,
 175 #ifdef CONFIG_COMPAT
 176         .compat_ioctl   = cmtp_sock_compat_ioctl,
 177 #endif
 178         .bind           = sock_no_bind,
 179         .getname        = sock_no_getname,
 180         .sendmsg        = sock_no_sendmsg,
 181         .recvmsg        = sock_no_recvmsg,
 182         .poll           = sock_no_poll,
 183         .listen         = sock_no_listen,
 184         .shutdown       = sock_no_shutdown,
 185         .setsockopt     = sock_no_setsockopt,
 186         .getsockopt     = sock_no_getsockopt,
 187         .connect        = sock_no_connect,
 188         .socketpair     = sock_no_socketpair,
 189         .accept         = sock_no_accept,
 190         .mmap           = sock_no_mmap
 191 };
 192
 193 static struct proto cmtp_proto = {
 194         .name           = "CMTP",
 195         .owner          = THIS_MODULE,
 196         .obj_size       = sizeof(struct bt_sock)
 197 };
 198
 199 static int cmtp_sock_create(struct socket *sock, int protocol)
 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(PF_BLUETOOTH, GFP_ATOMIC, &cmtp_proto, 1);
 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         return 0;
 224 }
 225
 226 static struct net_proto_family cmtp_sock_family_ops = {
 227         .family = PF_BLUETOOTH,
 228         .owner  = THIS_MODULE,
 229         .create = cmtp_sock_create
 230 };
 231
 232 int cmtp_init_sockets(void)
 233 {
 234         int err;
 235
 236         err = proto_register(&cmtp_proto, 0);
 237         if (err < 0)
 238                 return err;
 239
 240         err = bt_sock_register(BTPROTO_CMTP, &cmtp_sock_family_ops);
 241         if (err < 0)
 242                 goto error;
 243
 244         return 0;
 245
 246 error:
 247         BT_ERR("Can't register CMTP socket");
 248         proto_unregister(&cmtp_proto);
 249         return err;
 250 }
 251
 252 void cmtp_cleanup_sockets(void)
 253 {
 254         if (bt_sock_unregister(BTPROTO_CMTP) < 0)
 255                 BT_ERR("Can't unregister CMTP socket");
 256
 257         proto_unregister(&cmtp_proto);
 258 }