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/poll.h>
  30 #include <linux/fcntl.h>
  31 #include <linux/skbuff.h>
  32 #include <linux/socket.h>
  33 #include <linux/ioctl.h>
  34 #include <linux/file.h>
  35 #include <linux/compat.h>
  36 #include <linux/gfp.h>
  37 #include <linux/uaccess.h>
  38 #include <net/sock.h>
  39
  40 #include <linux/isdn/capilli.h>
  41
  42 #include <asm/system.h>
  43
  44 #include "cmtp.h"
  45
  46 static int cmtp_sock_release(struct socket *sock)
  47 {
  48         struct sock *sk = sock->sk;
  49
  50         BT_DBG("sock %p sk %p", sock, sk);
  51
  52         if (!sk)
  53                 return 0;
  54
  55         sock_orphan(sk);
  56         sock_put(sk);
  57
  58         return 0;
  59 }
  60
  61 static int cmtp_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
  62 {
  63         struct cmtp_connadd_req ca;
  64         struct cmtp_conndel_req cd;
  65         struct cmtp_connlist_req cl;
  66         struct cmtp_conninfo ci;
  67         struct socket *nsock;
  68         void __user *argp = (void __user *)arg;
  69         int err;
  70
  71         BT_DBG("cmd %x arg %lx", cmd, arg);
  72
  73         switch (cmd) {
  74         case CMTPCONNADD:
  75                 if (!capable(CAP_NET_ADMIN))
  76                         return -EACCES;
  77
  78                 if (copy_from_user(&ca, argp, sizeof(ca)))
  79                         return -EFAULT;
  80
  81                 nsock = sockfd_lookup(ca.sock, &err);
  82                 if (!nsock)
  83                         return err;
  84
  85                 if (nsock->sk->sk_state != BT_CONNECTED) {
  86                         sockfd_put(nsock);
  87                         return -EBADFD;
  88                 }
  89
  90                 err = cmtp_add_connection(&ca, nsock);
  91                 if (!err) {
  92                         if (copy_to_user(argp, &ca, sizeof(ca)))
  93                                 err = -EFAULT;
  94                 } else
  95                         sockfd_put(nsock);
  96
  97                 return err;
  98
  99         case CMTPCONNDEL:
 100                 if (!capable(CAP_NET_ADMIN))
 101                         return -EACCES;
 102
 103                 if (copy_from_user(&cd, argp, sizeof(cd)))
 104                         return -EFAULT;
 105
 106                 return cmtp_del_connection(&cd);
 107
 108         case CMTPGETCONNLIST:
 109                 if (copy_from_user(&cl, argp, sizeof(cl)))
 110                         return -EFAULT;
 111
 112                 if (cl.cnum <= 0)
 113                         return -EINVAL;
 114
 115                 err = cmtp_get_connlist(&cl);
 116                 if (!err && copy_to_user(argp, &cl, sizeof(cl)))
 117                         return -EFAULT;
 118
 119                 return err;
 120
 121         case CMTPGETCONNINFO:
 122                 if (copy_from_user(&ci, argp, sizeof(ci)))
 123                         return -EFAULT;
 124
 125                 err = cmtp_get_conninfo(&ci);
 126                 if (!err && copy_to_user(argp, &ci, sizeof(ci)))
 127                         return -EFAULT;
 128
 129                 return err;
 130         }
 131
 132         return -EINVAL;
 133 }
 134
 135 #ifdef CONFIG_COMPAT
 136 static int cmtp_sock_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 137 {
 138         if (cmd == CMTPGETCONNLIST) {
 139                 struct cmtp_connlist_req cl;
 140                 uint32_t uci;
 141                 int err;
 142
 143                 if (get_user(cl.cnum, (uint32_t __user *) arg) ||
 144                                 get_user(uci, (u32 __user *) (arg + 4)))
 145                         return -EFAULT;
 146
 147                 cl.ci = compat_ptr(uci);
 148
 149                 if (cl.cnum <= 0)
 150                         return -EINVAL;
 151
 152                 err = cmtp_get_connlist(&cl);
 153
 154                 if (!err && put_user(cl.cnum, (uint32_t __user *) arg))
 155                         err = -EFAULT;
 156
 157                 return err;
 158         }
 159
 160         return cmtp_sock_ioctl(sock, cmd, arg);
 161 }
 162 #endif
 163
 164 static const struct proto_ops cmtp_sock_ops = {
 165         .family         = PF_BLUETOOTH,
 166         .owner          = THIS_MODULE,
 167         .release        = cmtp_sock_release,
 168         .ioctl          = cmtp_sock_ioctl,
 169 #ifdef CONFIG_COMPAT
 170         .compat_ioctl   = cmtp_sock_compat_ioctl,
 171 #endif
 172         .bind           = sock_no_bind,
 173         .getname        = sock_no_getname,
 174         .sendmsg        = sock_no_sendmsg,
 175         .recvmsg        = sock_no_recvmsg,
 176         .poll           = sock_no_poll,
 177         .listen         = sock_no_listen,
 178         .shutdown       = sock_no_shutdown,
 179         .setsockopt     = sock_no_setsockopt,
 180         .getsockopt     = sock_no_getsockopt,
 181         .connect        = sock_no_connect,
 182         .socketpair     = sock_no_socketpair,
 183         .accept         = sock_no_accept,
 184         .mmap           = sock_no_mmap
 185 };
 186
 187 static struct proto cmtp_proto = {
 188         .name           = "CMTP",
 189         .owner          = THIS_MODULE,
 190         .obj_size       = sizeof(struct bt_sock)
 191 };
 192
 193 static int cmtp_sock_create(struct net *net, struct socket *sock, int protocol,
 194                             int kern)
 195 {
 196         struct sock *sk;
 197
 198         BT_DBG("sock %p", sock);
 199
 200         if (sock->type != SOCK_RAW)
 201                 return -ESOCKTNOSUPPORT;
 202
 203         sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &cmtp_proto);
 204         if (!sk)
 205                 return -ENOMEM;
 206
 207         sock_init_data(sock, sk);
 208
 209         sock->ops = &cmtp_sock_ops;
 210
 211         sock->state = SS_UNCONNECTED;
 212
 213         sock_reset_flag(sk, SOCK_ZAPPED);
 214
 215         sk->sk_protocol = protocol;
 216         sk->sk_state    = BT_OPEN;
 217
 218         return 0;
 219 }
 220
 221 static const struct net_proto_family cmtp_sock_family_ops = {
 222         .family = PF_BLUETOOTH,
 223         .owner  = THIS_MODULE,
 224         .create = cmtp_sock_create
 225 };
 226
 227 int cmtp_init_sockets(void)
 228 {
 229         int err;
 230
 231         err = proto_register(&cmtp_proto, 0);
 232         if (err < 0)
 233                 return err;
 234
 235         err = bt_sock_register(BTPROTO_CMTP, &cmtp_sock_family_ops);
 236         if (err < 0)
 237                 goto error;
 238
 239         return 0;
 240
 241 error:
 242         BT_ERR("Can't register CMTP socket");
 243         proto_unregister(&cmtp_proto);
 244         return err;
 245 }
 246
 247 void cmtp_cleanup_sockets(void)
 248 {
 249         if (bt_sock_unregister(BTPROTO_CMTP) < 0)
 250                 BT_ERR("Can't unregister CMTP socket");
 251
 252         proto_unregister(&cmtp_proto);
 253 }