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/slab.h>
  30 #include <linux/poll.h>
  31 #include <linux/fcntl.h>
  32 #include <linux/skbuff.h>
  33 #include <linux/socket.h>
  34 #include <linux/ioctl.h>
  35 #include <linux/file.h>
  36 #include <linux/compat.h>
  37 #include <net/sock.h>
  38
  39 #include <linux/isdn/capilli.h>
  40
  41 #include <asm/system.h>
  42 #include <asm/uaccess.h>
  43
  44 #include "cmtp.h"
  45
  46 #ifndef CONFIG_BT_CMTP_DEBUG
  47 #undef  BT_DBG
  48 #define BT_DBG(D...)
  49 #endif
  50
  51 static int cmtp_sock_release(struct socket *sock)
  52 {
  53         struct sock *sk = sock->sk;
  54
  55         BT_DBG("sock %p sk %p", sock, sk);
  56
  57         if (!sk)
  58                 return 0;
  59
  60         sock_orphan(sk);
  61         sock_put(sk);
  62
  63         return 0;
  64 }
  65
  66 static int cmtp_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
  67 {
  68         struct cmtp_connadd_req ca;
  69         struct cmtp_conndel_req cd;
  70         struct cmtp_connlist_req cl;
  71         struct cmtp_conninfo ci;
  72         struct socket *nsock;
  73         void __user *argp = (void __user *)arg;
  74         int err;
  75
  76         BT_DBG("cmd %x arg %lx", cmd, arg);
  77
  78         switch (cmd) {
  79         case CMTPCONNADD:
  80                 if (!capable(CAP_NET_ADMIN))
  81                         return -EACCES;
  82
  83                 if (copy_from_user(&ca, argp, sizeof(ca)))
  84                         return -EFAULT;
  85
  86                 nsock = sockfd_lookup(ca.sock, &err);
  87                 if (!nsock)
  88                         return err;
  89
  90                 if (nsock->sk->sk_state != BT_CONNECTED) {
  91                         fput(nsock->file);
  92                         return -EBADFD;
  93                 }
  94
  95                 err = cmtp_add_connection(&ca, nsock);
  96                 if (!err) {
  97                         if (copy_to_user(argp, &ca, sizeof(ca)))
  98                                 err = -EFAULT;
  99                 } else
 100                         fput(nsock->file);
 101
 102                 return err;
 103
 104         case CMTPCONNDEL:
 105                 if (!capable(CAP_NET_ADMIN))
 106                         return -EACCES;
 107
 108                 if (copy_from_user(&cd, argp, sizeof(cd)))
 109                         return -EFAULT;
 110
 111                 return cmtp_del_connection(&cd);
 112
 113         case CMTPGETCONNLIST:
 114                 if (copy_from_user(&cl, argp, sizeof(cl)))
 115                         return -EFAULT;
 116
 117                 if (cl.cnum <= 0)
 118                         return -EINVAL;
 119
 120                 err = cmtp_get_connlist(&cl);
 121                 if (!err && copy_to_user(argp, &cl, sizeof(cl)))
 122                         return -EFAULT;
 123
 124                 return err;
 125
 126         case CMTPGETCONNINFO:
 127                 if (copy_from_user(&ci, argp, sizeof(ci)))
 128                         return -EFAULT;
 129
 130                 err = cmtp_get_conninfo(&ci);
 131                 if (!err && copy_to_user(argp, &ci, sizeof(ci)))
 132                         return -EFAULT;
 133
 134                 return err;
 135         }
 136
 137         return -EINVAL;
 138 }
 139
 140 #ifdef CONFIG_COMPAT
 141 static int cmtp_sock_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 142 {
 143         if (cmd == CMTPGETCONNLIST) {
 144                 struct cmtp_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 = cmtp_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 cmtp_sock_ioctl(sock, cmd, arg);
 166 }
 167 #endif
 168
 169 static const struct proto_ops cmtp_sock_ops = {
 170         .family         = PF_BLUETOOTH,
 171         .owner          = THIS_MODULE,
 172         .release        = cmtp_sock_release,
 173         .ioctl          = cmtp_sock_ioctl,
 174 #ifdef CONFIG_COMPAT
 175         .compat_ioctl   = cmtp_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 cmtp_proto = {
 193         .name           = "CMTP",
 194         .owner          = THIS_MODULE,
 195         .obj_size       = sizeof(struct bt_sock)
 196 };
 197
 198 static int cmtp_sock_create(struct net *net, struct socket *sock, int protocol)
 199 {
 200         struct sock *sk;
 201
 202         BT_DBG("sock %p", sock);
 203
 204         if (sock->type != SOCK_RAW)
 205                 return -ESOCKTNOSUPPORT;
 206
 207         sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &cmtp_proto, 1);
 208         if (!sk)
 209                 return -ENOMEM;
 210
 211         sock_init_data(sock, sk);
 212
 213         sock->ops = &cmtp_sock_ops;
 214
 215         sock->state = SS_UNCONNECTED;
 216
 217         sock_reset_flag(sk, SOCK_ZAPPED);
 218
 219         sk->sk_protocol = protocol;
 220         sk->sk_state    = BT_OPEN;
 221
 222         return 0;
 223 }
 224
 225 static struct net_proto_family cmtp_sock_family_ops = {
 226         .family = PF_BLUETOOTH,
 227         .owner  = THIS_MODULE,
 228         .create = cmtp_sock_create
 229 };
 230
 231 int cmtp_init_sockets(void)
 232 {
 233         int err;
 234
 235         err = proto_register(&cmtp_proto, 0);
 236         if (err < 0)
 237                 return err;
 238
 239         err = bt_sock_register(BTPROTO_CMTP, &cmtp_sock_family_ops);
 240         if (err < 0)
 241                 goto error;
 242
 243         return 0;
 244
 245 error:
 246         BT_ERR("Can't register CMTP socket");
 247         proto_unregister(&cmtp_proto);
 248         return err;
 249 }
 250
 251 void cmtp_cleanup_sockets(void)
 252 {
 253         if (bt_sock_unregister(BTPROTO_CMTP) < 0)
 254                 BT_ERR("Can't unregister CMTP socket");
 255
 256         proto_unregister(&cmtp_proto);
 257 }