net/bluetooth/hidp/sock.c

   1 /*
   2    HIDP implementation for Linux Bluetooth stack (BlueZ).
   3    Copyright (C) 2003-2004 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 <linux/init.h>
  39 #include <net/sock.h>
  40
  41 #include "hidp.h"
  42
  43 #ifndef CONFIG_BT_HIDP_DEBUG
  44 #undef  BT_DBG
  45 #define BT_DBG(D...)
  46 #endif
  47
  48 static int hidp_sock_release(struct socket *sock)
  49 {
  50         struct sock *sk = sock->sk;
  51
  52         BT_DBG("sock %p sk %p", sock, sk);
  53
  54         if (!sk)
  55                 return 0;
  56
  57         sock_orphan(sk);
  58         sock_put(sk);
  59
  60         return 0;
  61 }
  62
  63 static int hidp_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
  64 {
  65         void __user *argp = (void __user *) arg;
  66         struct hidp_connadd_req ca;
  67         struct hidp_conndel_req cd;
  68         struct hidp_connlist_req cl;
  69         struct hidp_conninfo ci;
  70         struct socket *csock;
  71         struct socket *isock;
  72         int err;
  73
  74         BT_DBG("cmd %x arg %lx", cmd, arg);
  75
  76         switch (cmd) {
  77         case HIDPCONNADD:
  78                 if (!capable(CAP_NET_ADMIN))
  79                         return -EACCES;
  80
  81                 if (copy_from_user(&ca, argp, sizeof(ca)))
  82                         return -EFAULT;
  83
  84                 csock = sockfd_lookup(ca.ctrl_sock, &err);
  85                 if (!csock)
  86                         return err;
  87
  88                 isock = sockfd_lookup(ca.intr_sock, &err);
  89                 if (!isock) {
  90                         fput(csock->file);
  91                         return err;
  92                 }
  93
  94                 if (csock->sk->sk_state != BT_CONNECTED || isock->sk->sk_state != BT_CONNECTED) {
  95                         fput(csock->file);
  96                         fput(isock->file);
  97                         return -EBADFD;
  98                 }
  99
 100                 err = hidp_add_connection(&ca, csock, isock);
 101                 if (!err) {
 102                         if (copy_to_user(argp, &ca, sizeof(ca)))
 103                                 err = -EFAULT;
 104                 } else {
 105                         fput(csock->file);
 106                         fput(isock->file);
 107                 }
 108
 109                 return err;
 110
 111         case HIDPCONNDEL:
 112                 if (!capable(CAP_NET_ADMIN))
 113                         return -EACCES;
 114
 115                 if (copy_from_user(&cd, argp, sizeof(cd)))
 116                         return -EFAULT;
 117
 118                 return hidp_del_connection(&cd);
 119
 120         case HIDPGETCONNLIST:
 121                 if (copy_from_user(&cl, argp, sizeof(cl)))
 122                         return -EFAULT;
 123
 124                 if (cl.cnum <= 0)
 125                         return -EINVAL;
 126
 127                 err = hidp_get_connlist(&cl);
 128                 if (!err && copy_to_user(argp, &cl, sizeof(cl)))
 129                         return -EFAULT;
 130
 131                 return err;
 132
 133         case HIDPGETCONNINFO:
 134                 if (copy_from_user(&ci, argp, sizeof(ci)))
 135                         return -EFAULT;
 136
 137                 err = hidp_get_conninfo(&ci);
 138                 if (!err && copy_to_user(argp, &ci, sizeof(ci)))
 139                         return -EFAULT;
 140
 141                 return err;
 142         }
 143
 144         return -EINVAL;
 145 }
 146
 147 static const struct proto_ops hidp_sock_ops = {
 148         .family         = PF_BLUETOOTH,
 149         .owner          = THIS_MODULE,
 150         .release        = hidp_sock_release,
 151         .ioctl          = hidp_sock_ioctl,
 152         .bind           = sock_no_bind,
 153         .getname        = sock_no_getname,
 154         .sendmsg        = sock_no_sendmsg,
 155         .recvmsg        = sock_no_recvmsg,
 156         .poll           = sock_no_poll,
 157         .listen         = sock_no_listen,
 158         .shutdown       = sock_no_shutdown,
 159         .setsockopt     = sock_no_setsockopt,
 160         .getsockopt     = sock_no_getsockopt,
 161         .connect        = sock_no_connect,
 162         .socketpair     = sock_no_socketpair,
 163         .accept         = sock_no_accept,
 164         .mmap           = sock_no_mmap
 165 };
 166
 167 static struct proto hidp_proto = {
 168         .name           = "HIDP",
 169         .owner          = THIS_MODULE,
 170         .obj_size       = sizeof(struct bt_sock)
 171 };
 172
 173 static int hidp_sock_create(struct socket *sock, int protocol)
 174 {
 175         struct sock *sk;
 176
 177         BT_DBG("sock %p", sock);
 178
 179         if (sock->type != SOCK_RAW)
 180                 return -ESOCKTNOSUPPORT;
 181
 182         sk = sk_alloc(PF_BLUETOOTH, GFP_KERNEL, &hidp_proto, 1);
 183         if (!sk)
 184                 return -ENOMEM;
 185
 186         sock_init_data(sock, sk);
 187
 188         sock->ops = &hidp_sock_ops;
 189
 190         sock->state = SS_UNCONNECTED;
 191
 192         sock_reset_flag(sk, SOCK_ZAPPED);
 193
 194         sk->sk_protocol = protocol;
 195         sk->sk_state    = BT_OPEN;
 196
 197         return 0;
 198 }
 199
 200 static struct net_proto_family hidp_sock_family_ops = {
 201         .family = PF_BLUETOOTH,
 202         .owner  = THIS_MODULE,
 203         .create = hidp_sock_create
 204 };
 205
 206 int __init hidp_init_sockets(void)
 207 {
 208         int err;
 209
 210         err = proto_register(&hidp_proto, 0);
 211         if (err < 0)
 212                 return err;
 213
 214         err = bt_sock_register(BTPROTO_HIDP, &hidp_sock_family_ops);
 215         if (err < 0)
 216                 goto error;
 217
 218         return 0;
 219
 220 error:
 221         BT_ERR("Can't register HIDP socket");
 222         proto_unregister(&hidp_proto);
 223         return err;
 224 }
 225
 226 void __exit hidp_cleanup_sockets(void)
 227 {
 228         if (bt_sock_unregister(BTPROTO_HIDP) < 0)
 229                 BT_ERR("Can't unregister HIDP socket");
 230
 231         proto_unregister(&hidp_proto);
 232 }