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/poll.h> 30 #include <linux/fcntl.h> 31 #include <linux/skbuff.h> 32 #include <linux/socket.h> 33 #include <linux/ioctl.h> 34 #include <linux/file.h> 35 #include <linux/init.h> 36 #include <linux/compat.h> 37 #include <linux/gfp.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 int kern) 246 { 247 struct sock *sk; 248 249 BT_DBG("sock %p", sock); 250 251 if (sock->type != SOCK_RAW) 252 return -ESOCKTNOSUPPORT; 253 254 sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hidp_proto); 255 if (!sk) 256 return -ENOMEM; 257 258 sock_init_data(sock, sk); 259 260 sock->ops = &hidp_sock_ops; 261 262 sock->state = SS_UNCONNECTED; 263 264 sock_reset_flag(sk, SOCK_ZAPPED); 265 266 sk->sk_protocol = protocol; 267 sk->sk_state = BT_OPEN; 268 269 return 0; 270 } 271 272 static const struct net_proto_family hidp_sock_family_ops = { 273 .family = PF_BLUETOOTH, 274 .owner = THIS_MODULE, 275 .create = hidp_sock_create 276 }; 277 278 int __init hidp_init_sockets(void) 279 { 280 int err; 281 282 err = proto_register(&hidp_proto, 0); 283 if (err < 0) 284 return err; 285 286 err = bt_sock_register(BTPROTO_HIDP, &hidp_sock_family_ops); 287 if (err < 0) 288 goto error; 289 290 return 0; 291 292 error: 293 BT_ERR("Can't register HIDP socket"); 294 proto_unregister(&hidp_proto); 295 return err; 296 } 297 298 void __exit hidp_cleanup_sockets(void) 299 { 300 if (bt_sock_unregister(BTPROTO_HIDP) < 0) 301 BT_ERR("Can't unregister HIDP socket"); 302 303 proto_unregister(&hidp_proto); 304 } 305