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/export.h>
  28 #include <linux/file.h>
  29
  30 #include "bnep.h"
  31
  32 static struct bt_sock_list bnep_sk_list = {
  33         .lock = __RW_LOCK_UNLOCKED(bnep_sk_list.lock)
  34 };
  35
  36 static int bnep_sock_release(struct socket *sock)
  37 {
  38         struct sock *sk = sock->sk;
  39
  40         BT_DBG("sock %p sk %p", sock, sk);
  41
  42         if (!sk)
  43                 return 0;
  44
  45         bt_sock_unlink(&bnep_sk_list, sk);
  46
  47         sock_orphan(sk);
  48         sock_put(sk);
  49         return 0;
  50 }
  51
  52 static int bnep_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
  53 {
  54         struct bnep_connlist_req cl;
  55         struct bnep_connadd_req  ca;
  56         struct bnep_conndel_req  cd;
  57         struct bnep_conninfo ci;
  58         struct socket *nsock;
  59         void __user *argp = (void __user *)arg;
  60         int err;
  61
  62         BT_DBG("cmd %x arg %lx", cmd, arg);
  63
  64         switch (cmd) {
  65         case BNEPCONNADD:
  66                 if (!capable(CAP_NET_ADMIN))
  67                         return -EPERM;
  68
  69                 if (copy_from_user(&ca, argp, sizeof(ca)))
  70                         return -EFAULT;
  71
  72                 nsock = sockfd_lookup(ca.sock, &err);
  73                 if (!nsock)
  74                         return err;
  75
  76                 if (nsock->sk->sk_state != BT_CONNECTED) {
  77                         sockfd_put(nsock);
  78                         return -EBADFD;
  79                 }
  80                 ca.device[sizeof(ca.device)-1] = 0;
  81
  82                 err = bnep_add_connection(&ca, nsock);
  83                 if (!err) {
  84                         if (copy_to_user(argp, &ca, sizeof(ca)))
  85                                 err = -EFAULT;
  86                 } else
  87                         sockfd_put(nsock);
  88
  89                 return err;
  90
  91         case BNEPCONNDEL:
  92                 if (!capable(CAP_NET_ADMIN))
  93                         return -EPERM;
  94
  95                 if (copy_from_user(&cd, argp, sizeof(cd)))
  96                         return -EFAULT;
  97
  98                 return bnep_del_connection(&cd);
  99
 100         case BNEPGETCONNLIST:
 101                 if (copy_from_user(&cl, argp, sizeof(cl)))
 102                         return -EFAULT;
 103
 104                 if (cl.cnum <= 0)
 105                         return -EINVAL;
 106
 107                 err = bnep_get_connlist(&cl);
 108                 if (!err && copy_to_user(argp, &cl, sizeof(cl)))
 109                         return -EFAULT;
 110
 111                 return err;
 112
 113         case BNEPGETCONNINFO:
 114                 if (copy_from_user(&ci, argp, sizeof(ci)))
 115                         return -EFAULT;
 116
 117                 err = bnep_get_conninfo(&ci);
 118                 if (!err && copy_to_user(argp, &ci, sizeof(ci)))
 119                         return -EFAULT;
 120
 121                 return err;
 122
 123         default:
 124                 return -EINVAL;
 125         }
 126
 127         return 0;
 128 }
 129
 130 #ifdef CONFIG_COMPAT
 131 static int bnep_sock_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 132 {
 133         if (cmd == BNEPGETCONNLIST) {
 134                 struct bnep_connlist_req cl;
 135                 u32 uci;
 136                 int err;
 137
 138                 if (get_user(cl.cnum, (u32 __user *) arg) ||
 139                                 get_user(uci, (u32 __user *) (arg + 4)))
 140                         return -EFAULT;
 141
 142                 cl.ci = compat_ptr(uci);
 143
 144                 if (cl.cnum <= 0)
 145                         return -EINVAL;
 146
 147                 err = bnep_get_connlist(&cl);
 148
 149                 if (!err && put_user(cl.cnum, (u32 __user *) arg))
 150                         err = -EFAULT;
 151
 152                 return err;
 153         }
 154
 155         return bnep_sock_ioctl(sock, cmd, arg);
 156 }
 157 #endif
 158
 159 static const struct proto_ops bnep_sock_ops = {
 160         .family         = PF_BLUETOOTH,
 161         .owner          = THIS_MODULE,
 162         .release        = bnep_sock_release,
 163         .ioctl          = bnep_sock_ioctl,
 164 #ifdef CONFIG_COMPAT
 165         .compat_ioctl   = bnep_sock_compat_ioctl,
 166 #endif
 167         .bind           = sock_no_bind,
 168         .getname        = sock_no_getname,
 169         .sendmsg        = sock_no_sendmsg,
 170         .recvmsg        = sock_no_recvmsg,
 171         .poll           = sock_no_poll,
 172         .listen         = sock_no_listen,
 173         .shutdown       = sock_no_shutdown,
 174         .setsockopt     = sock_no_setsockopt,
 175         .getsockopt     = sock_no_getsockopt,
 176         .connect        = sock_no_connect,
 177         .socketpair     = sock_no_socketpair,
 178         .accept         = sock_no_accept,
 179         .mmap           = sock_no_mmap
 180 };
 181
 182 static struct proto bnep_proto = {
 183         .name           = "BNEP",
 184         .owner          = THIS_MODULE,
 185         .obj_size       = sizeof(struct bt_sock)
 186 };
 187
 188 static int bnep_sock_create(struct net *net, struct socket *sock, int protocol,
 189                             int kern)
 190 {
 191         struct sock *sk;
 192
 193         BT_DBG("sock %p", sock);
 194
 195         if (sock->type != SOCK_RAW)
 196                 return -ESOCKTNOSUPPORT;
 197
 198         sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &bnep_proto);
 199         if (!sk)
 200                 return -ENOMEM;
 201
 202         sock_init_data(sock, sk);
 203
 204         sock->ops = &bnep_sock_ops;
 205
 206         sock->state = SS_UNCONNECTED;
 207
 208         sock_reset_flag(sk, SOCK_ZAPPED);
 209
 210         sk->sk_protocol = protocol;
 211         sk->sk_state    = BT_OPEN;
 212
 213         bt_sock_link(&bnep_sk_list, sk);
 214         return 0;
 215 }
 216
 217 static const struct net_proto_family bnep_sock_family_ops = {
 218         .family = PF_BLUETOOTH,
 219         .owner  = THIS_MODULE,
 220         .create = bnep_sock_create
 221 };
 222
 223 int __init bnep_sock_init(void)
 224 {
 225         int err;
 226
 227         err = proto_register(&bnep_proto, 0);
 228         if (err < 0)
 229                 return err;
 230
 231         err = bt_sock_register(BTPROTO_BNEP, &bnep_sock_family_ops);
 232         if (err < 0) {
 233                 BT_ERR("Can't register BNEP socket");
 234                 goto error;
 235         }
 236
 237         err = bt_procfs_init(&init_net, "bnep", &bnep_sk_list, NULL);
 238         if (err < 0) {
 239                 BT_ERR("Failed to create BNEP proc file");
 240                 bt_sock_unregister(BTPROTO_BNEP);
 241                 goto error;
 242         }
 243
 244         BT_INFO("BNEP socket layer initialized");
 245
 246         return 0;
 247
 248 error:
 249         proto_unregister(&bnep_proto);
 250         return err;
 251 }
 252
 253 void __exit bnep_sock_cleanup(void)
 254 {
 255         bt_procfs_cleanup(&init_net, "bnep");
 256         bt_sock_unregister(BTPROTO_BNEP);
 257         proto_unregister(&bnep_proto);
 258 }