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/sched.h>
  30 #include <linux/slab.h>
  31 #include <linux/poll.h>
  32 #include <linux/fcntl.h>
  33 #include <linux/skbuff.h>
  34 #include <linux/socket.h>
  35 #include <linux/ioctl.h>
  36 #include <linux/file.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 static const struct proto_ops cmtp_sock_ops = {
 141         .family         = PF_BLUETOOTH,
 142         .owner          = THIS_MODULE,
 143         .release        = cmtp_sock_release,
 144         .ioctl          = cmtp_sock_ioctl,
 145         .bind           = sock_no_bind,
 146         .getname        = sock_no_getname,
 147         .sendmsg        = sock_no_sendmsg,
 148         .recvmsg        = sock_no_recvmsg,
 149         .poll           = sock_no_poll,
 150         .listen         = sock_no_listen,
 151         .shutdown       = sock_no_shutdown,
 152         .setsockopt     = sock_no_setsockopt,
 153         .getsockopt     = sock_no_getsockopt,
 154         .connect        = sock_no_connect,
 155         .socketpair     = sock_no_socketpair,
 156         .accept         = sock_no_accept,
 157         .mmap           = sock_no_mmap
 158 };
 159
 160 static struct proto cmtp_proto = {
 161         .name           = "CMTP",
 162         .owner          = THIS_MODULE,
 163         .obj_size       = sizeof(struct bt_sock)
 164 };
 165
 166 static int cmtp_sock_create(struct socket *sock, int protocol)
 167 {
 168         struct sock *sk;
 169
 170         BT_DBG("sock %p", sock);
 171
 172         if (sock->type != SOCK_RAW)
 173                 return -ESOCKTNOSUPPORT;
 174
 175         sk = sk_alloc(PF_BLUETOOTH, GFP_KERNEL, &cmtp_proto, 1);
 176         if (!sk)
 177                 return -ENOMEM;
 178
 179         sock_init_data(sock, sk);
 180
 181         sock->ops = &cmtp_sock_ops;
 182
 183         sock->state = SS_UNCONNECTED;
 184
 185         sock_reset_flag(sk, SOCK_ZAPPED);
 186
 187         sk->sk_protocol = protocol;
 188         sk->sk_state    = BT_OPEN;
 189
 190         return 0;
 191 }
 192
 193 static struct net_proto_family cmtp_sock_family_ops = {
 194         .family = PF_BLUETOOTH,
 195         .owner  = THIS_MODULE,
 196         .create = cmtp_sock_create
 197 };
 198
 199 int cmtp_init_sockets(void)
 200 {
 201         int err;
 202
 203         err = proto_register(&cmtp_proto, 0);
 204         if (err < 0)
 205                 return err;
 206
 207         err = bt_sock_register(BTPROTO_CMTP, &cmtp_sock_family_ops);
 208         if (err < 0)
 209                 goto error;
 210
 211         return 0;
 212
 213 error:
 214         BT_ERR("Can't register CMTP socket");
 215         proto_unregister(&cmtp_proto);
 216         return err;
 217 }
 218
 219 void cmtp_cleanup_sockets(void)
 220 {
 221         if (bt_sock_unregister(BTPROTO_CMTP) < 0)
 222                 BT_ERR("Can't unregister CMTP socket");
 223
 224         proto_unregister(&cmtp_proto);
 225 }