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/poll.h>
  34 #include <linux/fcntl.h>
  35 #include <linux/skbuff.h>
  36 #include <linux/socket.h>
  37 #include <linux/ioctl.h>
  38 #include <linux/file.h>
  39 #include <linux/init.h>
  40 #include <linux/compat.h>
  41 #include <linux/gfp.h>
  42 #include <net/sock.h>
  43
  44 #include <asm/system.h>
  45 #include <asm/uaccess.h>
  46
  47 #include "bnep.h"
  48
  49 static int bnep_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         sock_orphan(sk);
  59         sock_put(sk);
  60         return 0;
  61 }
  62
  63 static int bnep_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
  64 {
  65         struct bnep_connlist_req cl;
  66         struct bnep_connadd_req  ca;
  67         struct bnep_conndel_req  cd;
  68         struct bnep_conninfo ci;
  69         struct socket *nsock;
  70         void __user *argp = (void __user *)arg;
  71         int err;
  72
  73         BT_DBG("cmd %x arg %lx", cmd, arg);
  74
  75         switch (cmd) {
  76         case BNEPCONNADD:
  77                 if (!capable(CAP_NET_ADMIN))
  78                         return -EACCES;
  79
  80                 if (copy_from_user(&ca, argp, sizeof(ca)))
  81                         return -EFAULT;
  82
  83                 nsock = sockfd_lookup(ca.sock, &err);
  84                 if (!nsock)
  85                         return err;
  86
  87                 if (nsock->sk->sk_state != BT_CONNECTED) {
  88                         sockfd_put(nsock);
  89                         return -EBADFD;
  90                 }
  91
  92                 err = bnep_add_connection(&ca, nsock);
  93                 if (!err) {
  94                         if (copy_to_user(argp, &ca, sizeof(ca)))
  95                                 err = -EFAULT;
  96                 } else
  97                         sockfd_put(nsock);
  98
  99                 return err;
 100
 101         case BNEPCONNDEL:
 102                 if (!capable(CAP_NET_ADMIN))
 103                         return -EACCES;
 104
 105                 if (copy_from_user(&cd, argp, sizeof(cd)))
 106                         return -EFAULT;
 107
 108                 return bnep_del_connection(&cd);
 109
 110         case BNEPGETCONNLIST:
 111                 if (copy_from_user(&cl, argp, sizeof(cl)))
 112                         return -EFAULT;
 113
 114                 if (cl.cnum <= 0)
 115                         return -EINVAL;
 116
 117                 err = bnep_get_connlist(&cl);
 118                 if (!err && copy_to_user(argp, &cl, sizeof(cl)))
 119                         return -EFAULT;
 120
 121                 return err;
 122
 123         case BNEPGETCONNINFO:
 124                 if (copy_from_user(&ci, argp, sizeof(ci)))
 125                         return -EFAULT;
 126
 127                 err = bnep_get_conninfo(&ci);
 128                 if (!err && copy_to_user(argp, &ci, sizeof(ci)))
 129                         return -EFAULT;
 130
 131                 return err;
 132
 133         default:
 134                 return -EINVAL;
 135         }
 136
 137         return 0;
 138 }
 139
 140 #ifdef CONFIG_COMPAT
 141 static int bnep_sock_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 142 {
 143         if (cmd == BNEPGETCONNLIST) {
 144                 struct bnep_connlist_req cl;
 145                 uint32_t uci;
 146                 int err;
 147
 148                 if (get_user(cl.cnum, (uint32_t __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 = bnep_get_connlist(&cl);
 158
 159                 if (!err && put_user(cl.cnum, (uint32_t __user *) arg))
 160                         err = -EFAULT;
 161
 162                 return err;
 163         }
 164
 165         return bnep_sock_ioctl(sock, cmd, arg);
 166 }
 167 #endif
 168
 169 static const struct proto_ops bnep_sock_ops = {
 170         .family         = PF_BLUETOOTH,
 171         .owner          = THIS_MODULE,
 172         .release        = bnep_sock_release,
 173         .ioctl          = bnep_sock_ioctl,
 174 #ifdef CONFIG_COMPAT
 175         .compat_ioctl   = bnep_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 bnep_proto = {
 193         .name           = "BNEP",
 194         .owner          = THIS_MODULE,
 195         .obj_size       = sizeof(struct bt_sock)
 196 };
 197
 198 static int bnep_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, &bnep_proto);
 209         if (!sk)
 210                 return -ENOMEM;
 211
 212         sock_init_data(sock, sk);
 213
 214         sock->ops = &bnep_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 const struct net_proto_family bnep_sock_family_ops = {
 227         .family = PF_BLUETOOTH,
 228         .owner  = THIS_MODULE,
 229         .create = bnep_sock_create
 230 };
 231
 232 int __init bnep_sock_init(void)
 233 {
 234         int err;
 235
 236         err = proto_register(&bnep_proto, 0);
 237         if (err < 0)
 238                 return err;
 239
 240         err = bt_sock_register(BTPROTO_BNEP, &bnep_sock_family_ops);
 241         if (err < 0)
 242                 goto error;
 243
 244         return 0;
 245
 246 error:
 247         BT_ERR("Can't register BNEP socket");
 248         proto_unregister(&bnep_proto);
 249         return err;
 250 }
 251
 252 void __exit bnep_sock_cleanup(void)
 253 {
 254         if (bt_sock_unregister(BTPROTO_BNEP) < 0)
 255                 BT_ERR("Can't unregister BNEP socket");
 256
 257         proto_unregister(&bnep_proto);
 258 }