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/config.h>
  24 #include <linux/module.h>
  25
  26 #include <linux/types.h>
  27 #include <linux/capability.h>
  28 #include <linux/errno.h>
  29 #include <linux/kernel.h>
  30 #include <linux/sched.h>
  31 #include <linux/slab.h>
  32 #include <linux/poll.h>
  33 #include <linux/fcntl.h>
  34 #include <linux/skbuff.h>
  35 #include <linux/socket.h>
  36 #include <linux/ioctl.h>
  37 #include <linux/file.h>
  38 #include <net/sock.h>
  39
  40 #include <linux/isdn/capilli.h>
  41
  42 #include <asm/system.h>
  43 #include <asm/uaccess.h>
  44
  45 #include "cmtp.h"
  46
  47 #ifndef CONFIG_BT_CMTP_DEBUG
  48 #undef  BT_DBG
  49 #define BT_DBG(D...)
  50 #endif
  51
  52 static int cmtp_sock_release(struct socket *sock)
  53 {
  54         struct sock *sk = sock->sk;
  55
  56         BT_DBG("sock %p sk %p", sock, sk);
  57
  58         if (!sk)
  59                 return 0;
  60
  61         sock_orphan(sk);
  62         sock_put(sk);
  63
  64         return 0;
  65 }
  66
  67 static int cmtp_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
  68 {
  69         struct cmtp_connadd_req ca;
  70         struct cmtp_conndel_req cd;
  71         struct cmtp_connlist_req cl;
  72         struct cmtp_conninfo ci;
  73         struct socket *nsock;
  74         void __user *argp = (void __user *)arg;
  75         int err;
  76
  77         BT_DBG("cmd %x arg %lx", cmd, arg);
  78
  79         switch (cmd) {
  80         case CMTPCONNADD:
  81                 if (!capable(CAP_NET_ADMIN))
  82                         return -EACCES;
  83
  84                 if (copy_from_user(&ca, argp, sizeof(ca)))
  85                         return -EFAULT;
  86
  87                 nsock = sockfd_lookup(ca.sock, &err);
  88                 if (!nsock)
  89                         return err;
  90
  91                 if (nsock->sk->sk_state != BT_CONNECTED) {
  92                         fput(nsock->file);
  93                         return -EBADFD;
  94                 }
  95
  96                 err = cmtp_add_connection(&ca, nsock);
  97                 if (!err) {
  98                         if (copy_to_user(argp, &ca, sizeof(ca)))
  99                                 err = -EFAULT;
 100                 } else
 101                         fput(nsock->file);
 102
 103                 return err;
 104
 105         case CMTPCONNDEL:
 106                 if (!capable(CAP_NET_ADMIN))
 107                         return -EACCES;
 108
 109                 if (copy_from_user(&cd, argp, sizeof(cd)))
 110                         return -EFAULT;
 111
 112                 return cmtp_del_connection(&cd);
 113
 114         case CMTPGETCONNLIST:
 115                 if (copy_from_user(&cl, argp, sizeof(cl)))
 116                         return -EFAULT;
 117
 118                 if (cl.cnum <= 0)
 119                         return -EINVAL;
 120
 121                 err = cmtp_get_connlist(&cl);
 122                 if (!err && copy_to_user(argp, &cl, sizeof(cl)))
 123                         return -EFAULT;
 124
 125                 return err;
 126
 127         case CMTPGETCONNINFO:
 128                 if (copy_from_user(&ci, argp, sizeof(ci)))
 129                         return -EFAULT;
 130
 131                 err = cmtp_get_conninfo(&ci);
 132                 if (!err && copy_to_user(argp, &ci, sizeof(ci)))
 133                         return -EFAULT;
 134
 135                 return err;
 136         }
 137
 138         return -EINVAL;
 139 }
 140
 141 static const struct proto_ops cmtp_sock_ops = {
 142         .family         = PF_BLUETOOTH,
 143         .owner          = THIS_MODULE,
 144         .release        = cmtp_sock_release,
 145         .ioctl          = cmtp_sock_ioctl,
 146         .bind           = sock_no_bind,
 147         .getname        = sock_no_getname,
 148         .sendmsg        = sock_no_sendmsg,
 149         .recvmsg        = sock_no_recvmsg,
 150         .poll           = sock_no_poll,
 151         .listen         = sock_no_listen,
 152         .shutdown       = sock_no_shutdown,
 153         .setsockopt     = sock_no_setsockopt,
 154         .getsockopt     = sock_no_getsockopt,
 155         .connect        = sock_no_connect,
 156         .socketpair     = sock_no_socketpair,
 157         .accept         = sock_no_accept,
 158         .mmap           = sock_no_mmap
 159 };
 160
 161 static struct proto cmtp_proto = {
 162         .name           = "CMTP",
 163         .owner          = THIS_MODULE,
 164         .obj_size       = sizeof(struct bt_sock)
 165 };
 166
 167 static int cmtp_sock_create(struct socket *sock, int protocol)
 168 {
 169         struct sock *sk;
 170
 171         BT_DBG("sock %p", sock);
 172
 173         if (sock->type != SOCK_RAW)
 174                 return -ESOCKTNOSUPPORT;
 175
 176         sk = sk_alloc(PF_BLUETOOTH, GFP_KERNEL, &cmtp_proto, 1);
 177         if (!sk)
 178                 return -ENOMEM;
 179
 180         sock_init_data(sock, sk);
 181
 182         sock->ops = &cmtp_sock_ops;
 183
 184         sock->state = SS_UNCONNECTED;
 185
 186         sock_reset_flag(sk, SOCK_ZAPPED);
 187
 188         sk->sk_protocol = protocol;
 189         sk->sk_state    = BT_OPEN;
 190
 191         return 0;
 192 }
 193
 194 static struct net_proto_family cmtp_sock_family_ops = {
 195         .family = PF_BLUETOOTH,
 196         .owner  = THIS_MODULE,
 197         .create = cmtp_sock_create
 198 };
 199
 200 int cmtp_init_sockets(void)
 201 {
 202         int err;
 203
 204         err = proto_register(&cmtp_proto, 0);
 205         if (err < 0)
 206                 return err;
 207
 208         err = bt_sock_register(BTPROTO_CMTP, &cmtp_sock_family_ops);
 209         if (err < 0)
 210                 goto error;
 211
 212         return 0;
 213
 214 error:
 215         BT_ERR("Can't register CMTP socket");
 216         proto_unregister(&cmtp_proto);
 217         return err;
 218 }
 219
 220 void cmtp_cleanup_sockets(void)
 221 {
 222         if (bt_sock_unregister(BTPROTO_CMTP) < 0)
 223                 BT_ERR("Can't unregister CMTP socket");
 224
 225         proto_unregister(&cmtp_proto);
 226 }