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/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/slab.h>
  30 #include <linux/poll.h>
  31 #include <linux/fcntl.h>
  32 #include <linux/skbuff.h>
  33 #include <linux/socket.h>
  34 #include <linux/ioctl.h>
  35 #include <linux/file.h>
  36 #include <linux/init.h>
  37 #include <linux/compat.h>
  38 #include <net/sock.h>
  39
  40 #include "hidp.h"
  41
  42 static int hidp_sock_release(struct socket *sock)
  43 {
  44         struct sock *sk = sock->sk;
  45
  46         BT_DBG("sock %p sk %p", sock, sk);
  47
  48         if (!sk)
  49                 return 0;
  50
  51         sock_orphan(sk);
  52         sock_put(sk);
  53
  54         return 0;
  55 }
  56
  57 static int hidp_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
  58 {
  59         void __user *argp = (void __user *) arg;
  60         struct hidp_connadd_req ca;
  61         struct hidp_conndel_req cd;
  62         struct hidp_connlist_req cl;
  63         struct hidp_conninfo ci;
  64         struct socket *csock;
  65         struct socket *isock;
  66         int err;
  67
  68         BT_DBG("cmd %x arg %lx", cmd, arg);
  69
  70         switch (cmd) {
  71         case HIDPCONNADD:
  72                 if (!capable(CAP_NET_ADMIN))
  73                         return -EACCES;
  74
  75                 if (copy_from_user(&ca, argp, sizeof(ca)))
  76                         return -EFAULT;
  77
  78                 csock = sockfd_lookup(ca.ctrl_sock, &err);
  79                 if (!csock)
  80                         return err;
  81
  82                 isock = sockfd_lookup(ca.intr_sock, &err);
  83                 if (!isock) {
  84                         sockfd_put(csock);
  85                         return err;
  86                 }
  87
  88                 if (csock->sk->sk_state != BT_CONNECTED || isock->sk->sk_state != BT_CONNECTED) {
  89                         sockfd_put(csock);
  90                         sockfd_put(isock);
  91                         return -EBADFD;
  92                 }
  93
  94                 err = hidp_add_connection(&ca, csock, isock);
  95                 if (!err) {
  96                         if (copy_to_user(argp, &ca, sizeof(ca)))
  97                                 err = -EFAULT;
  98                 } else {
  99                         sockfd_put(csock);
 100                         sockfd_put(isock);
 101                 }
 102
 103                 return err;
 104
 105         case HIDPCONNDEL:
 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 hidp_del_connection(&cd);
 113
 114         case HIDPGETCONNLIST:
 115                 if (copy_from_user(&cl, argp, sizeof(cl)))
 116                         return -EFAULT;
 117
 118                 if (cl.cnum <= 0)
 119                         return -EINVAL;
 120
 121                 err = hidp_get_connlist(&cl);
 122                 if (!err && copy_to_user(argp, &cl, sizeof(cl)))
 123                         return -EFAULT;
 124
 125                 return err;
 126
 127         case HIDPGETCONNINFO:
 128                 if (copy_from_user(&ci, argp, sizeof(ci)))
 129                         return -EFAULT;
 130
 131                 err = hidp_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 #ifdef CONFIG_COMPAT
 142 struct compat_hidp_connadd_req {
 143         int   ctrl_sock;        // Connected control socket
 144         int   intr_sock;        // Connteted interrupt socket
 145         __u16 parser;
 146         __u16 rd_size;
 147         compat_uptr_t rd_data;
 148         __u8  country;
 149         __u8  subclass;
 150         __u16 vendor;
 151         __u16 product;
 152         __u16 version;
 153         __u32 flags;
 154         __u32 idle_to;
 155         char  name[128];
 156 };
 157
 158 static int hidp_sock_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 159 {
 160         if (cmd == HIDPGETCONNLIST) {
 161                 struct hidp_connlist_req cl;
 162                 uint32_t uci;
 163                 int err;
 164
 165                 if (get_user(cl.cnum, (uint32_t __user *) arg) ||
 166                                 get_user(uci, (u32 __user *) (arg + 4)))
 167                         return -EFAULT;
 168
 169                 cl.ci = compat_ptr(uci);
 170
 171                 if (cl.cnum <= 0)
 172                         return -EINVAL;
 173
 174                 err = hidp_get_connlist(&cl);
 175
 176                 if (!err && put_user(cl.cnum, (uint32_t __user *) arg))
 177                         err = -EFAULT;
 178
 179                 return err;
 180         } else if (cmd == HIDPCONNADD) {
 181                 struct compat_hidp_connadd_req ca;
 182                 struct hidp_connadd_req __user *uca;
 183
 184                 uca = compat_alloc_user_space(sizeof(*uca));
 185
 186                 if (copy_from_user(&ca, (void __user *) arg, sizeof(ca)))
 187                         return -EFAULT;
 188
 189                 if (put_user(ca.ctrl_sock, &uca->ctrl_sock) ||
 190                                 put_user(ca.intr_sock, &uca->intr_sock) ||
 191                                 put_user(ca.parser, &uca->parser) ||
 192                                 put_user(ca.rd_size, &uca->rd_size) ||
 193                                 put_user(compat_ptr(ca.rd_data), &uca->rd_data) ||
 194                                 put_user(ca.country, &uca->country) ||
 195                                 put_user(ca.subclass, &uca->subclass) ||
 196                                 put_user(ca.vendor, &uca->vendor) ||
 197                                 put_user(ca.product, &uca->product) ||
 198                                 put_user(ca.version, &uca->version) ||
 199                                 put_user(ca.flags, &uca->flags) ||
 200                                 put_user(ca.idle_to, &uca->idle_to) ||
 201                                 copy_to_user(&uca->name[0], &ca.name[0], 128))
 202                         return -EFAULT;
 203
 204                 arg = (unsigned long) uca;
 205
 206                 /* Fall through. We don't actually write back any _changes_
 207                    to the structure anyway, so there's no need to copy back
 208                    into the original compat version */
 209         }
 210
 211         return hidp_sock_ioctl(sock, cmd, arg);
 212 }
 213 #endif
 214
 215 static const struct proto_ops hidp_sock_ops = {
 216         .family         = PF_BLUETOOTH,
 217         .owner          = THIS_MODULE,
 218         .release        = hidp_sock_release,
 219         .ioctl          = hidp_sock_ioctl,
 220 #ifdef CONFIG_COMPAT
 221         .compat_ioctl   = hidp_sock_compat_ioctl,
 222 #endif
 223         .bind           = sock_no_bind,
 224         .getname        = sock_no_getname,
 225         .sendmsg        = sock_no_sendmsg,
 226         .recvmsg        = sock_no_recvmsg,
 227         .poll           = sock_no_poll,
 228         .listen         = sock_no_listen,
 229         .shutdown       = sock_no_shutdown,
 230         .setsockopt     = sock_no_setsockopt,
 231         .getsockopt     = sock_no_getsockopt,
 232         .connect        = sock_no_connect,
 233         .socketpair     = sock_no_socketpair,
 234         .accept         = sock_no_accept,
 235         .mmap           = sock_no_mmap
 236 };
 237
 238 static struct proto hidp_proto = {
 239         .name           = "HIDP",
 240         .owner          = THIS_MODULE,
 241         .obj_size       = sizeof(struct bt_sock)
 242 };
 243
 244 static int hidp_sock_create(struct net *net, struct socket *sock, int protocol)
 245 {
 246         struct sock *sk;
 247
 248         BT_DBG("sock %p", sock);
 249
 250         if (sock->type != SOCK_RAW)
 251                 return -ESOCKTNOSUPPORT;
 252
 253         sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hidp_proto);
 254         if (!sk)
 255                 return -ENOMEM;
 256
 257         sock_init_data(sock, sk);
 258
 259         sock->ops = &hidp_sock_ops;
 260
 261         sock->state = SS_UNCONNECTED;
 262
 263         sock_reset_flag(sk, SOCK_ZAPPED);
 264
 265         sk->sk_protocol = protocol;
 266         sk->sk_state    = BT_OPEN;
 267
 268         return 0;
 269 }
 270
 271 static struct net_proto_family hidp_sock_family_ops = {
 272         .family = PF_BLUETOOTH,
 273         .owner  = THIS_MODULE,
 274         .create = hidp_sock_create
 275 };
 276
 277 int __init hidp_init_sockets(void)
 278 {
 279         int err;
 280
 281         err = proto_register(&hidp_proto, 0);
 282         if (err < 0)
 283                 return err;
 284
 285         err = bt_sock_register(BTPROTO_HIDP, &hidp_sock_family_ops);
 286         if (err < 0)
 287                 goto error;
 288
 289         return 0;
 290
 291 error:
 292         BT_ERR("Can't register HIDP socket");
 293         proto_unregister(&hidp_proto);
 294         return err;
 295 }
 296
 297 void __exit hidp_cleanup_sockets(void)
 298 {
 299         if (bt_sock_unregister(BTPROTO_HIDP) < 0)
 300                 BT_ERR("Can't unregister HIDP socket");
 301
 302         proto_unregister(&hidp_proto);
 303 }