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/export.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
  43 #include "cmtp.h"
  44
  45 static struct bt_sock_list cmtp_sk_list = {
  46         .lock = __RW_LOCK_UNLOCKED(cmtp_sk_list.lock)
  47 };
  48
  49 static int cmtp_sock_release(struct socket *sock)
  50 {
  51         struct sock *sk = sock->sk;
  52
  53         BT_DBG("sock %p sk %p", sock, sk);
  54
  55         if (!sk)
  56                 return 0;
  57
  58         bt_sock_unlink(&cmtp_sk_list, sk);
  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 -EPERM;
  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                         sockfd_put(nsock);
  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                         sockfd_put(nsock);
 101
 102                 return err;
 103
 104         case CMTPCONNDEL:
 105                 if (!capable(CAP_NET_ADMIN))
 106                         return -EPERM;
 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                 u32 uci;
 146                 int err;
 147
 148                 if (get_user(cl.cnum, (u32 __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, (u32 __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                             int kern)
 200 {
 201         struct sock *sk;
 202
 203         BT_DBG("sock %p", sock);
 204
 205         if (sock->type != SOCK_RAW)
 206                 return -ESOCKTNOSUPPORT;
 207
 208         sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &cmtp_proto);
 209         if (!sk)
 210                 return -ENOMEM;
 211
 212         sock_init_data(sock, sk);
 213
 214         sock->ops = &cmtp_sock_ops;
 215
 216         sock->state = SS_UNCONNECTED;
 217
 218         sock_reset_flag(sk, SOCK_ZAPPED);
 219
 220         sk->sk_protocol = protocol;
 221         sk->sk_state    = BT_OPEN;
 222
 223         bt_sock_link(&cmtp_sk_list, sk);
 224
 225         return 0;
 226 }
 227
 228 static const struct net_proto_family cmtp_sock_family_ops = {
 229         .family = PF_BLUETOOTH,
 230         .owner  = THIS_MODULE,
 231         .create = cmtp_sock_create
 232 };
 233
 234 int cmtp_init_sockets(void)
 235 {
 236         int err;
 237
 238         err = proto_register(&cmtp_proto, 0);
 239         if (err < 0)
 240                 return err;
 241
 242         err = bt_sock_register(BTPROTO_CMTP, &cmtp_sock_family_ops);
 243         if (err < 0) {
 244                 BT_ERR("Can't register CMTP socket");
 245                 goto error;
 246         }
 247
 248         err = bt_procfs_init(&init_net, "cmtp", &cmtp_sk_list, NULL);
 249         if (err < 0) {
 250                 BT_ERR("Failed to create CMTP proc file");
 251                 bt_sock_unregister(BTPROTO_HIDP);
 252                 goto error;
 253         }
 254
 255         BT_INFO("CMTP socket layer initialized");
 256
 257         return 0;
 258
 259 error:
 260         proto_unregister(&cmtp_proto);
 261         return err;
 262 }
 263
 264 void cmtp_cleanup_sockets(void)
 265 {
 266         bt_procfs_cleanup(&init_net, "cmtp");
 267         bt_sock_unregister(BTPROTO_CMTP);
 268         proto_unregister(&cmtp_proto);
 269 }