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/export.h>
  24 #include <linux/file.h>
  25
  26 #include "hidp.h"
  27
  28 static int hidp_sock_release(struct socket *sock)
  29 {
  30         struct sock *sk = sock->sk;
  31
  32         BT_DBG("sock %p sk %p", sock, sk);
  33
  34         if (!sk)
  35                 return 0;
  36
  37         sock_orphan(sk);
  38         sock_put(sk);
  39
  40         return 0;
  41 }
  42
  43 static int hidp_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
  44 {
  45         void __user *argp = (void __user *) arg;
  46         struct hidp_connadd_req ca;
  47         struct hidp_conndel_req cd;
  48         struct hidp_connlist_req cl;
  49         struct hidp_conninfo ci;
  50         struct socket *csock;
  51         struct socket *isock;
  52         int err;
  53
  54         BT_DBG("cmd %x arg %lx", cmd, arg);
  55
  56         switch (cmd) {
  57         case HIDPCONNADD:
  58                 if (!capable(CAP_NET_ADMIN))
  59                         return -EPERM;
  60
  61                 if (copy_from_user(&ca, argp, sizeof(ca)))
  62                         return -EFAULT;
  63
  64                 csock = sockfd_lookup(ca.ctrl_sock, &err);
  65                 if (!csock)
  66                         return err;
  67
  68                 isock = sockfd_lookup(ca.intr_sock, &err);
  69                 if (!isock) {
  70                         sockfd_put(csock);
  71                         return err;
  72                 }
  73
  74                 if (csock->sk->sk_state != BT_CONNECTED ||
  75                                 isock->sk->sk_state != BT_CONNECTED) {
  76                         sockfd_put(csock);
  77                         sockfd_put(isock);
  78                         return -EBADFD;
  79                 }
  80
  81                 err = hidp_add_connection(&ca, csock, isock);
  82                 if (!err) {
  83                         if (copy_to_user(argp, &ca, sizeof(ca)))
  84                                 err = -EFAULT;
  85                 } else {
  86                         sockfd_put(csock);
  87                         sockfd_put(isock);
  88                 }
  89
  90                 return err;
  91
  92         case HIDPCONNDEL:
  93                 if (!capable(CAP_NET_ADMIN))
  94                         return -EPERM;
  95
  96                 if (copy_from_user(&cd, argp, sizeof(cd)))
  97                         return -EFAULT;
  98
  99                 return hidp_del_connection(&cd);
 100
 101         case HIDPGETCONNLIST:
 102                 if (copy_from_user(&cl, argp, sizeof(cl)))
 103                         return -EFAULT;
 104
 105                 if (cl.cnum <= 0)
 106                         return -EINVAL;
 107
 108                 err = hidp_get_connlist(&cl);
 109                 if (!err && copy_to_user(argp, &cl, sizeof(cl)))
 110                         return -EFAULT;
 111
 112                 return err;
 113
 114         case HIDPGETCONNINFO:
 115                 if (copy_from_user(&ci, argp, sizeof(ci)))
 116                         return -EFAULT;
 117
 118                 err = hidp_get_conninfo(&ci);
 119                 if (!err && copy_to_user(argp, &ci, sizeof(ci)))
 120                         return -EFAULT;
 121
 122                 return err;
 123         }
 124
 125         return -EINVAL;
 126 }
 127
 128 #ifdef CONFIG_COMPAT
 129 struct compat_hidp_connadd_req {
 130         int   ctrl_sock;        /* Connected control socket */
 131         int   intr_sock;        /* Connected interrupt socket */
 132         __u16 parser;
 133         __u16 rd_size;
 134         compat_uptr_t rd_data;
 135         __u8  country;
 136         __u8  subclass;
 137         __u16 vendor;
 138         __u16 product;
 139         __u16 version;
 140         __u32 flags;
 141         __u32 idle_to;
 142         char  name[128];
 143 };
 144
 145 static int hidp_sock_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 146 {
 147         if (cmd == HIDPGETCONNLIST) {
 148                 struct hidp_connlist_req cl;
 149                 u32 uci;
 150                 int err;
 151
 152                 if (get_user(cl.cnum, (u32 __user *) arg) ||
 153                                 get_user(uci, (u32 __user *) (arg + 4)))
 154                         return -EFAULT;
 155
 156                 cl.ci = compat_ptr(uci);
 157
 158                 if (cl.cnum <= 0)
 159                         return -EINVAL;
 160
 161                 err = hidp_get_connlist(&cl);
 162
 163                 if (!err && put_user(cl.cnum, (u32 __user *) arg))
 164                         err = -EFAULT;
 165
 166                 return err;
 167         } else if (cmd == HIDPCONNADD) {
 168                 struct compat_hidp_connadd_req ca;
 169                 struct hidp_connadd_req __user *uca;
 170
 171                 uca = compat_alloc_user_space(sizeof(*uca));
 172
 173                 if (copy_from_user(&ca, (void __user *) arg, sizeof(ca)))
 174                         return -EFAULT;
 175
 176                 if (put_user(ca.ctrl_sock, &uca->ctrl_sock) ||
 177                                 put_user(ca.intr_sock, &uca->intr_sock) ||
 178                                 put_user(ca.parser, &uca->parser) ||
 179                                 put_user(ca.rd_size, &uca->rd_size) ||
 180                                 put_user(compat_ptr(ca.rd_data), &uca->rd_data) ||
 181                                 put_user(ca.country, &uca->country) ||
 182                                 put_user(ca.subclass, &uca->subclass) ||
 183                                 put_user(ca.vendor, &uca->vendor) ||
 184                                 put_user(ca.product, &uca->product) ||
 185                                 put_user(ca.version, &uca->version) ||
 186                                 put_user(ca.flags, &uca->flags) ||
 187                                 put_user(ca.idle_to, &uca->idle_to) ||
 188                                 copy_to_user(&uca->name[0], &ca.name[0], 128))
 189                         return -EFAULT;
 190
 191                 arg = (unsigned long) uca;
 192
 193                 /* Fall through. We don't actually write back any _changes_
 194                    to the structure anyway, so there's no need to copy back
 195                    into the original compat version */
 196         }
 197
 198         return hidp_sock_ioctl(sock, cmd, arg);
 199 }
 200 #endif
 201
 202 static const struct proto_ops hidp_sock_ops = {
 203         .family         = PF_BLUETOOTH,
 204         .owner          = THIS_MODULE,
 205         .release        = hidp_sock_release,
 206         .ioctl          = hidp_sock_ioctl,
 207 #ifdef CONFIG_COMPAT
 208         .compat_ioctl   = hidp_sock_compat_ioctl,
 209 #endif
 210         .bind           = sock_no_bind,
 211         .getname        = sock_no_getname,
 212         .sendmsg        = sock_no_sendmsg,
 213         .recvmsg        = sock_no_recvmsg,
 214         .poll           = sock_no_poll,
 215         .listen         = sock_no_listen,
 216         .shutdown       = sock_no_shutdown,
 217         .setsockopt     = sock_no_setsockopt,
 218         .getsockopt     = sock_no_getsockopt,
 219         .connect        = sock_no_connect,
 220         .socketpair     = sock_no_socketpair,
 221         .accept         = sock_no_accept,
 222         .mmap           = sock_no_mmap
 223 };
 224
 225 static struct proto hidp_proto = {
 226         .name           = "HIDP",
 227         .owner          = THIS_MODULE,
 228         .obj_size       = sizeof(struct bt_sock)
 229 };
 230
 231 static int hidp_sock_create(struct net *net, struct socket *sock, int protocol,
 232                             int kern)
 233 {
 234         struct sock *sk;
 235
 236         BT_DBG("sock %p", sock);
 237
 238         if (sock->type != SOCK_RAW)
 239                 return -ESOCKTNOSUPPORT;
 240
 241         sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hidp_proto);
 242         if (!sk)
 243                 return -ENOMEM;
 244
 245         sock_init_data(sock, sk);
 246
 247         sock->ops = &hidp_sock_ops;
 248
 249         sock->state = SS_UNCONNECTED;
 250
 251         sock_reset_flag(sk, SOCK_ZAPPED);
 252
 253         sk->sk_protocol = protocol;
 254         sk->sk_state    = BT_OPEN;
 255
 256         return 0;
 257 }
 258
 259 static const struct net_proto_family hidp_sock_family_ops = {
 260         .family = PF_BLUETOOTH,
 261         .owner  = THIS_MODULE,
 262         .create = hidp_sock_create
 263 };
 264
 265 int __init hidp_init_sockets(void)
 266 {
 267         int err;
 268
 269         err = proto_register(&hidp_proto, 0);
 270         if (err < 0)
 271                 return err;
 272
 273         err = bt_sock_register(BTPROTO_HIDP, &hidp_sock_family_ops);
 274         if (err < 0)
 275                 goto error;
 276
 277         return 0;
 278
 279 error:
 280         BT_ERR("Can't register HIDP socket");
 281         proto_unregister(&hidp_proto);
 282         return err;
 283 }
 284
 285 void __exit hidp_cleanup_sockets(void)
 286 {
 287         if (bt_sock_unregister(BTPROTO_HIDP) < 0)
 288                 BT_ERR("Can't unregister HIDP socket");
 289
 290         proto_unregister(&hidp_proto);
 291 }