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 #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                         sockfd_put(csock);
  90                         return err;
  91                 }
  92
  93                 if (csock->sk->sk_state != BT_CONNECTED || isock->sk->sk_state != BT_CONNECTED) {
  94                         sockfd_put(csock);
  95                         sockfd_put(isock);
  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                         sockfd_put(csock);
 105                         sockfd_put(isock);
 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 #ifdef CONFIG_COMPAT
 147 struct compat_hidp_connadd_req {
 148         int   ctrl_sock;        // Connected control socket
 149         int   intr_sock;        // Connteted interrupt socket
 150         __u16 parser;
 151         __u16 rd_size;
 152         compat_uptr_t rd_data;
 153         __u8  country;
 154         __u8  subclass;
 155         __u16 vendor;
 156         __u16 product;
 157         __u16 version;
 158         __u32 flags;
 159         __u32 idle_to;
 160         char  name[128];
 161 };
 162
 163 static int hidp_sock_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 164 {
 165         if (cmd == HIDPGETCONNLIST) {
 166                 struct hidp_connlist_req cl;
 167                 uint32_t uci;
 168                 int err;
 169
 170                 if (get_user(cl.cnum, (uint32_t __user *) arg) ||
 171                                 get_user(uci, (u32 __user *) (arg + 4)))
 172                         return -EFAULT;
 173
 174                 cl.ci = compat_ptr(uci);
 175
 176                 if (cl.cnum <= 0)
 177                         return -EINVAL;
 178
 179                 err = hidp_get_connlist(&cl);
 180
 181                 if (!err && put_user(cl.cnum, (uint32_t __user *) arg))
 182                         err = -EFAULT;
 183
 184                 return err;
 185         } else if (cmd == HIDPCONNADD) {
 186                 struct compat_hidp_connadd_req ca;
 187                 struct hidp_connadd_req __user *uca;
 188
 189                 uca = compat_alloc_user_space(sizeof(*uca));
 190
 191                 if (copy_from_user(&ca, (void __user *) arg, sizeof(ca)))
 192                         return -EFAULT;
 193
 194                 if (put_user(ca.ctrl_sock, &uca->ctrl_sock) ||
 195                                 put_user(ca.intr_sock, &uca->intr_sock) ||
 196                                 put_user(ca.parser, &uca->parser) ||
 197                                 put_user(ca.rd_size, &uca->rd_size) ||
 198                                 put_user(compat_ptr(ca.rd_data), &uca->rd_data) ||
 199                                 put_user(ca.country, &uca->country) ||
 200                                 put_user(ca.subclass, &uca->subclass) ||
 201                                 put_user(ca.vendor, &uca->vendor) ||
 202                                 put_user(ca.product, &uca->product) ||
 203                                 put_user(ca.version, &uca->version) ||
 204                                 put_user(ca.flags, &uca->flags) ||
 205                                 put_user(ca.idle_to, &uca->idle_to) ||
 206                                 copy_to_user(&uca->name[0], &ca.name[0], 128))
 207                         return -EFAULT;
 208
 209                 arg = (unsigned long) uca;
 210
 211                 /* Fall through. We don't actually write back any _changes_
 212                    to the structure anyway, so there's no need to copy back
 213                    into the original compat version */
 214         }
 215
 216         return hidp_sock_ioctl(sock, cmd, arg);
 217 }
 218 #endif
 219
 220 static const struct proto_ops hidp_sock_ops = {
 221         .family         = PF_BLUETOOTH,
 222         .owner          = THIS_MODULE,
 223         .release        = hidp_sock_release,
 224         .ioctl          = hidp_sock_ioctl,
 225 #ifdef CONFIG_COMPAT
 226         .compat_ioctl   = hidp_sock_compat_ioctl,
 227 #endif
 228         .bind           = sock_no_bind,
 229         .getname        = sock_no_getname,
 230         .sendmsg        = sock_no_sendmsg,
 231         .recvmsg        = sock_no_recvmsg,
 232         .poll           = sock_no_poll,
 233         .listen         = sock_no_listen,
 234         .shutdown       = sock_no_shutdown,
 235         .setsockopt     = sock_no_setsockopt,
 236         .getsockopt     = sock_no_getsockopt,
 237         .connect        = sock_no_connect,
 238         .socketpair     = sock_no_socketpair,
 239         .accept         = sock_no_accept,
 240         .mmap           = sock_no_mmap
 241 };
 242
 243 static struct proto hidp_proto = {
 244         .name           = "HIDP",
 245         .owner          = THIS_MODULE,
 246         .obj_size       = sizeof(struct bt_sock)
 247 };
 248
 249 static int hidp_sock_create(struct net *net, struct socket *sock, int protocol)
 250 {
 251         struct sock *sk;
 252
 253         BT_DBG("sock %p", sock);
 254
 255         if (sock->type != SOCK_RAW)
 256                 return -ESOCKTNOSUPPORT;
 257
 258         sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hidp_proto);
 259         if (!sk)
 260                 return -ENOMEM;
 261
 262         sock_init_data(sock, sk);
 263
 264         sock->ops = &hidp_sock_ops;
 265
 266         sock->state = SS_UNCONNECTED;
 267
 268         sock_reset_flag(sk, SOCK_ZAPPED);
 269
 270         sk->sk_protocol = protocol;
 271         sk->sk_state    = BT_OPEN;
 272
 273         return 0;
 274 }
 275
 276 static struct net_proto_family hidp_sock_family_ops = {
 277         .family = PF_BLUETOOTH,
 278         .owner  = THIS_MODULE,
 279         .create = hidp_sock_create
 280 };
 281
 282 int __init hidp_init_sockets(void)
 283 {
 284         int err;
 285
 286         err = proto_register(&hidp_proto, 0);
 287         if (err < 0)
 288                 return err;
 289
 290         err = bt_sock_register(BTPROTO_HIDP, &hidp_sock_family_ops);
 291         if (err < 0)
 292                 goto error;
 293
 294         return 0;
 295
 296 error:
 297         BT_ERR("Can't register HIDP socket");
 298         proto_unregister(&hidp_proto);
 299         return err;
 300 }
 301
 302 void __exit hidp_cleanup_sockets(void)
 303 {
 304         if (bt_sock_unregister(BTPROTO_HIDP) < 0)
 305                 BT_ERR("Can't unregister HIDP socket");
 306
 307         proto_unregister(&hidp_proto);
 308 }