net/bluetooth/bnep/sock.c

   1 /*
   2    BNEP implementation for Linux Bluetooth stack (BlueZ).
   3    Copyright (C) 2001-2002 Inventel Systemes
   4    Written 2001-2002 by
   5         David Libault  <david.libault@inventel.fr>
   6
   7    Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License version 2 as
  11    published by the Free Software Foundation;
  12
  13    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  14    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
  16    IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
  17    CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
  18    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  19    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  20    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  21
  22    ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
  23    COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
  24    SOFTWARE IS DISCLAIMED.
  25 */
  26
  27 #include <linux/module.h>
  28
  29 #include <linux/types.h>
  30 #include <linux/capability.h>
  31 #include <linux/errno.h>
  32 #include <linux/kernel.h>
  33 #include <linux/slab.h>
  34 #include <linux/poll.h>
  35 #include <linux/fcntl.h>
  36 #include <linux/skbuff.h>
  37 #include <linux/socket.h>
  38 #include <linux/ioctl.h>
  39 #include <linux/file.h>
  40 #include <linux/init.h>
  41 #include <linux/compat.h>
  42 #include <net/sock.h>
  43
  44 #include <asm/system.h>
  45 #include <asm/uaccess.h>
  46
  47 #include "bnep.h"
  48
  49 #ifndef CONFIG_BT_BNEP_DEBUG
  50 #undef  BT_DBG
  51 #define BT_DBG( A... )
  52 #endif
  53
  54 static int bnep_sock_release(struct socket *sock)
  55 {
  56         struct sock *sk = sock->sk;
  57
  58         BT_DBG("sock %p sk %p", sock, sk);
  59
  60         if (!sk)
  61                 return 0;
  62
  63         sock_orphan(sk);
  64         sock_put(sk);
  65         return 0;
  66 }
  67
  68 static int bnep_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
  69 {
  70         struct bnep_connlist_req cl;
  71         struct bnep_connadd_req  ca;
  72         struct bnep_conndel_req  cd;
  73         struct bnep_conninfo ci;
  74         struct socket *nsock;
  75         void __user *argp = (void __user *)arg;
  76         int err;
  77
  78         BT_DBG("cmd %x arg %lx", cmd, arg);
  79
  80         switch (cmd) {
  81         case BNEPCONNADD:
  82                 if (!capable(CAP_NET_ADMIN))
  83                         return -EACCES;
  84
  85                 if (copy_from_user(&ca, argp, sizeof(ca)))
  86                         return -EFAULT;
  87
  88                 nsock = sockfd_lookup(ca.sock, &err);
  89                 if (!nsock)
  90                         return err;
  91
  92                 if (nsock->sk->sk_state != BT_CONNECTED) {
  93                         sockfd_put(nsock);
  94                         return -EBADFD;
  95                 }
  96
  97                 err = bnep_add_connection(&ca, nsock);
  98                 if (!err) {
  99                         if (copy_to_user(argp, &ca, sizeof(ca)))
 100                                 err = -EFAULT;
 101                 } else
 102                         sockfd_put(nsock);
 103
 104                 return err;
 105
 106         case BNEPCONNDEL:
 107                 if (!capable(CAP_NET_ADMIN))
 108                         return -EACCES;
 109
 110                 if (copy_from_user(&cd, argp, sizeof(cd)))
 111                         return -EFAULT;
 112
 113                 return bnep_del_connection(&cd);
 114
 115         case BNEPGETCONNLIST:
 116                 if (copy_from_user(&cl, argp, sizeof(cl)))
 117                         return -EFAULT;
 118
 119                 if (cl.cnum <= 0)
 120                         return -EINVAL;
 121
 122                 err = bnep_get_connlist(&cl);
 123                 if (!err && copy_to_user(argp, &cl, sizeof(cl)))
 124                         return -EFAULT;
 125
 126                 return err;
 127
 128         case BNEPGETCONNINFO:
 129                 if (copy_from_user(&ci, argp, sizeof(ci)))
 130                         return -EFAULT;
 131
 132                 err = bnep_get_conninfo(&ci);
 133                 if (!err && copy_to_user(argp, &ci, sizeof(ci)))
 134                         return -EFAULT;
 135
 136                 return err;
 137
 138         default:
 139                 return -EINVAL;
 140         }
 141
 142         return 0;
 143 }
 144
 145 #ifdef CONFIG_COMPAT
 146 static int bnep_sock_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 147 {
 148         if (cmd == BNEPGETCONNLIST) {
 149                 struct bnep_connlist_req cl;
 150                 uint32_t uci;
 151                 int err;
 152
 153                 if (get_user(cl.cnum, (uint32_t __user *) arg) ||
 154                                 get_user(uci, (u32 __user *) (arg + 4)))
 155                         return -EFAULT;
 156
 157                 cl.ci = compat_ptr(uci);
 158
 159                 if (cl.cnum <= 0)
 160                         return -EINVAL;
 161
 162                 err = bnep_get_connlist(&cl);
 163
 164                 if (!err && put_user(cl.cnum, (uint32_t __user *) arg))
 165                         err = -EFAULT;
 166
 167                 return err;
 168         }
 169
 170         return bnep_sock_ioctl(sock, cmd, arg);
 171 }
 172 #endif
 173
 174 static const struct proto_ops bnep_sock_ops = {
 175         .family         = PF_BLUETOOTH,
 176         .owner          = THIS_MODULE,
 177         .release        = bnep_sock_release,
 178         .ioctl          = bnep_sock_ioctl,
 179 #ifdef CONFIG_COMPAT
 180         .compat_ioctl   = bnep_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         .poll           = sock_no_poll,
 187         .listen         = sock_no_listen,
 188         .shutdown       = sock_no_shutdown,
 189         .setsockopt     = sock_no_setsockopt,
 190         .getsockopt     = sock_no_getsockopt,
 191         .connect        = sock_no_connect,
 192         .socketpair     = sock_no_socketpair,
 193         .accept         = sock_no_accept,
 194         .mmap           = sock_no_mmap
 195 };
 196
 197 static struct proto bnep_proto = {
 198         .name           = "BNEP",
 199         .owner          = THIS_MODULE,
 200         .obj_size       = sizeof(struct bt_sock)
 201 };
 202
 203 static int bnep_sock_create(struct net *net, struct socket *sock, int protocol)
 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, &bnep_proto);
 213         if (!sk)
 214                 return -ENOMEM;
 215
 216         sock_init_data(sock, sk);
 217
 218         sock->ops = &bnep_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         return 0;
 228 }
 229
 230 static struct net_proto_family bnep_sock_family_ops = {
 231         .family = PF_BLUETOOTH,
 232         .owner  = THIS_MODULE,
 233         .create = bnep_sock_create
 234 };
 235
 236 int __init bnep_sock_init(void)
 237 {
 238         int err;
 239
 240         err = proto_register(&bnep_proto, 0);
 241         if (err < 0)
 242                 return err;
 243
 244         err = bt_sock_register(BTPROTO_BNEP, &bnep_sock_family_ops);
 245         if (err < 0)
 246                 goto error;
 247
 248         return 0;
 249
 250 error:
 251         BT_ERR("Can't register BNEP socket");
 252         proto_unregister(&bnep_proto);
 253         return err;
 254 }
 255
 256 void __exit bnep_sock_cleanup(void)
 257 {
 258         if (bt_sock_unregister(BTPROTO_BNEP) < 0)
 259                 BT_ERR("Can't unregister BNEP socket");
 260
 261         proto_unregister(&bnep_proto);
 262 }