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         __u32 supp_feat = BIT(BNEP_SETUP_RESPONSE);
  61         int err;
  62
  63         BT_DBG("cmd %x arg %lx", cmd, arg);
  64
  65         switch (cmd) {
  66         case BNEPCONNADD:
  67                 if (!capable(CAP_NET_ADMIN))
  68                         return -EPERM;
  69
  70                 if (copy_from_user(&ca, argp, sizeof(ca)))
  71                         return -EFAULT;
  72
  73                 nsock = sockfd_lookup(ca.sock, &err);
  74                 if (!nsock)
  75                         return err;
  76
  77                 if (nsock->sk->sk_state != BT_CONNECTED) {
  78                         sockfd_put(nsock);
  79                         return -EBADFD;
  80                 }
  81                 ca.device[sizeof(ca.device)-1] = 0;
  82
  83                 err = bnep_add_connection(&ca, nsock);
  84                 if (!err) {
  85                         if (copy_to_user(argp, &ca, sizeof(ca)))
  86                                 err = -EFAULT;
  87                 } else
  88                         sockfd_put(nsock);
  89
  90                 return err;
  91
  92         case BNEPCONNDEL:
  93                 if (!capable(CAP_NET_ADMIN))
  94                         return -EPERM;
  95
  96                 if (copy_from_user(&cd, argp, sizeof(cd)))
  97                         return -EFAULT;
  98
  99                 return bnep_del_connection(&cd);
 100
 101         case BNEPGETCONNLIST:
 102                 if (copy_from_user(&cl, argp, sizeof(cl)))
 103                         return -EFAULT;
 104
 105                 if (cl.cnum <= 0)
 106                         return -EINVAL;
 107
 108                 err = bnep_get_connlist(&cl);
 109                 if (!err && copy_to_user(argp, &cl, sizeof(cl)))
 110                         return -EFAULT;
 111
 112                 return err;
 113
 114         case BNEPGETCONNINFO:
 115                 if (copy_from_user(&ci, argp, sizeof(ci)))
 116                         return -EFAULT;
 117
 118                 err = bnep_get_conninfo(&ci);
 119                 if (!err && copy_to_user(argp, &ci, sizeof(ci)))
 120                         return -EFAULT;
 121
 122                 return err;
 123
 124         case BNEPGETSUPPFEAT:
 125                 if (copy_to_user(argp, &supp_feat, sizeof(supp_feat)))
 126                         return -EFAULT;
 127
 128                 return 0;
 129
 130         default:
 131                 return -EINVAL;
 132         }
 133
 134         return 0;
 135 }
 136
 137 #ifdef CONFIG_COMPAT
 138 static int bnep_sock_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 139 {
 140         if (cmd == BNEPGETCONNLIST) {
 141                 struct bnep_connlist_req cl;
 142                 u32 uci;
 143                 int err;
 144
 145                 if (get_user(cl.cnum, (u32 __user *) arg) ||
 146                                 get_user(uci, (u32 __user *) (arg + 4)))
 147                         return -EFAULT;
 148
 149                 cl.ci = compat_ptr(uci);
 150
 151                 if (cl.cnum <= 0)
 152                         return -EINVAL;
 153
 154                 err = bnep_get_connlist(&cl);
 155
 156                 if (!err && put_user(cl.cnum, (u32 __user *) arg))
 157                         err = -EFAULT;
 158
 159                 return err;
 160         }
 161
 162         return bnep_sock_ioctl(sock, cmd, arg);
 163 }
 164 #endif
 165
 166 static const struct proto_ops bnep_sock_ops = {
 167         .family         = PF_BLUETOOTH,
 168         .owner          = THIS_MODULE,
 169         .release        = bnep_sock_release,
 170         .ioctl          = bnep_sock_ioctl,
 171 #ifdef CONFIG_COMPAT
 172         .compat_ioctl   = bnep_sock_compat_ioctl,
 173 #endif
 174         .bind           = sock_no_bind,
 175         .getname        = sock_no_getname,
 176         .sendmsg        = sock_no_sendmsg,
 177         .recvmsg        = sock_no_recvmsg,
 178         .poll           = sock_no_poll,
 179         .listen         = sock_no_listen,
 180         .shutdown       = sock_no_shutdown,
 181         .setsockopt     = sock_no_setsockopt,
 182         .getsockopt     = sock_no_getsockopt,
 183         .connect        = sock_no_connect,
 184         .socketpair     = sock_no_socketpair,
 185         .accept         = sock_no_accept,
 186         .mmap           = sock_no_mmap
 187 };
 188
 189 static struct proto bnep_proto = {
 190         .name           = "BNEP",
 191         .owner          = THIS_MODULE,
 192         .obj_size       = sizeof(struct bt_sock)
 193 };
 194
 195 static int bnep_sock_create(struct net *net, struct socket *sock, int protocol,
 196                             int kern)
 197 {
 198         struct sock *sk;
 199
 200         BT_DBG("sock %p", sock);
 201
 202         if (sock->type != SOCK_RAW)
 203                 return -ESOCKTNOSUPPORT;
 204
 205         sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &bnep_proto, kern);
 206         if (!sk)
 207                 return -ENOMEM;
 208
 209         sock_init_data(sock, sk);
 210
 211         sock->ops = &bnep_sock_ops;
 212
 213         sock->state = SS_UNCONNECTED;
 214
 215         sock_reset_flag(sk, SOCK_ZAPPED);
 216
 217         sk->sk_protocol = protocol;
 218         sk->sk_state    = BT_OPEN;
 219
 220         bt_sock_link(&bnep_sk_list, sk);
 221         return 0;
 222 }
 223
 224 static const struct net_proto_family bnep_sock_family_ops = {
 225         .family = PF_BLUETOOTH,
 226         .owner  = THIS_MODULE,
 227         .create = bnep_sock_create
 228 };
 229
 230 int __init bnep_sock_init(void)
 231 {
 232         int err;
 233
 234         err = proto_register(&bnep_proto, 0);
 235         if (err < 0)
 236                 return err;
 237
 238         err = bt_sock_register(BTPROTO_BNEP, &bnep_sock_family_ops);
 239         if (err < 0) {
 240                 BT_ERR("Can't register BNEP socket");
 241                 goto error;
 242         }
 243
 244         err = bt_procfs_init(&init_net, "bnep", &bnep_sk_list, NULL);
 245         if (err < 0) {
 246                 BT_ERR("Failed to create BNEP proc file");
 247                 bt_sock_unregister(BTPROTO_BNEP);
 248                 goto error;
 249         }
 250
 251         BT_INFO("BNEP socket layer initialized");
 252
 253         return 0;
 254
 255 error:
 256         proto_unregister(&bnep_proto);
 257         return err;
 258 }
 259
 260 void __exit bnep_sock_cleanup(void)
 261 {
 262         bt_procfs_cleanup(&init_net, "bnep");
 263         bt_sock_unregister(BTPROTO_BNEP);
 264         proto_unregister(&bnep_proto);
 265 }