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