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 struct bt_sock_list hidp_sk_list = { 29 .lock = __RW_LOCK_UNLOCKED(hidp_sk_list.lock) 30 }; 31 32 static int hidp_sock_release(struct socket *sock) 33 { 34 struct sock *sk = sock->sk; 35 36 BT_DBG("sock %p sk %p", sock, sk); 37 38 if (!sk) 39 return 0; 40 41 bt_sock_unlink(&hidp_sk_list, sk); 42 43 sock_orphan(sk); 44 sock_put(sk); 45 46 return 0; 47 } 48 49 static int hidp_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 50 { 51 void __user *argp = (void __user *) arg; 52 struct hidp_connadd_req ca; 53 struct hidp_conndel_req cd; 54 struct hidp_connlist_req cl; 55 struct hidp_conninfo ci; 56 struct socket *csock; 57 struct socket *isock; 58 int err; 59 60 BT_DBG("cmd %x arg %lx", cmd, arg); 61 62 switch (cmd) { 63 case HIDPCONNADD: 64 if (!capable(CAP_NET_ADMIN)) 65 return -EPERM; 66 67 if (copy_from_user(&ca, argp, sizeof(ca))) 68 return -EFAULT; 69 70 csock = sockfd_lookup(ca.ctrl_sock, &err); 71 if (!csock) 72 return err; 73 74 isock = sockfd_lookup(ca.intr_sock, &err); 75 if (!isock) { 76 sockfd_put(csock); 77 return err; 78 } 79 80 if (csock->sk->sk_state != BT_CONNECTED || 81 isock->sk->sk_state != BT_CONNECTED) { 82 sockfd_put(csock); 83 sockfd_put(isock); 84 return -EBADFD; 85 } 86 87 err = hidp_add_connection(&ca, csock, isock); 88 if (!err) { 89 if (copy_to_user(argp, &ca, sizeof(ca))) 90 err = -EFAULT; 91 } else { 92 sockfd_put(csock); 93 sockfd_put(isock); 94 } 95 96 return err; 97 98 case HIDPCONNDEL: 99 if (!capable(CAP_NET_ADMIN)) 100 return -EPERM; 101 102 if (copy_from_user(&cd, argp, sizeof(cd))) 103 return -EFAULT; 104 105 return hidp_del_connection(&cd); 106 107 case HIDPGETCONNLIST: 108 if (copy_from_user(&cl, argp, sizeof(cl))) 109 return -EFAULT; 110 111 if (cl.cnum <= 0) 112 return -EINVAL; 113 114 err = hidp_get_connlist(&cl); 115 if (!err && copy_to_user(argp, &cl, sizeof(cl))) 116 return -EFAULT; 117 118 return err; 119 120 case HIDPGETCONNINFO: 121 if (copy_from_user(&ci, argp, sizeof(ci))) 122 return -EFAULT; 123 124 err = hidp_get_conninfo(&ci); 125 if (!err && copy_to_user(argp, &ci, sizeof(ci))) 126 return -EFAULT; 127 128 return err; 129 } 130 131 return -EINVAL; 132 } 133 134 #ifdef CONFIG_COMPAT 135 struct compat_hidp_connadd_req { 136 int ctrl_sock; /* Connected control socket */ 137 int intr_sock; /* Connected interrupt socket */ 138 __u16 parser; 139 __u16 rd_size; 140 compat_uptr_t rd_data; 141 __u8 country; 142 __u8 subclass; 143 __u16 vendor; 144 __u16 product; 145 __u16 version; 146 __u32 flags; 147 __u32 idle_to; 148 char name[128]; 149 }; 150 151 static int hidp_sock_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 152 { 153 if (cmd == HIDPGETCONNLIST) { 154 struct hidp_connlist_req cl; 155 u32 uci; 156 int err; 157 158 if (get_user(cl.cnum, (u32 __user *) arg) || 159 get_user(uci, (u32 __user *) (arg + 4))) 160 return -EFAULT; 161 162 cl.ci = compat_ptr(uci); 163 164 if (cl.cnum <= 0) 165 return -EINVAL; 166 167 err = hidp_get_connlist(&cl); 168 169 if (!err && put_user(cl.cnum, (u32 __user *) arg)) 170 err = -EFAULT; 171 172 return err; 173 } else if (cmd == HIDPCONNADD) { 174 struct compat_hidp_connadd_req ca; 175 struct hidp_connadd_req __user *uca; 176 177 uca = compat_alloc_user_space(sizeof(*uca)); 178 179 if (copy_from_user(&ca, (void __user *) arg, sizeof(ca))) 180 return -EFAULT; 181 182 if (put_user(ca.ctrl_sock, &uca->ctrl_sock) || 183 put_user(ca.intr_sock, &uca->intr_sock) || 184 put_user(ca.parser, &uca->parser) || 185 put_user(ca.rd_size, &uca->rd_size) || 186 put_user(compat_ptr(ca.rd_data), &uca->rd_data) || 187 put_user(ca.country, &uca->country) || 188 put_user(ca.subclass, &uca->subclass) || 189 put_user(ca.vendor, &uca->vendor) || 190 put_user(ca.product, &uca->product) || 191 put_user(ca.version, &uca->version) || 192 put_user(ca.flags, &uca->flags) || 193 put_user(ca.idle_to, &uca->idle_to) || 194 copy_to_user(&uca->name[0], &ca.name[0], 128)) 195 return -EFAULT; 196 197 arg = (unsigned long) uca; 198 199 /* Fall through. We don't actually write back any _changes_ 200 to the structure anyway, so there's no need to copy back 201 into the original compat version */ 202 } 203 204 return hidp_sock_ioctl(sock, cmd, arg); 205 } 206 #endif 207 208 static const struct proto_ops hidp_sock_ops = { 209 .family = PF_BLUETOOTH, 210 .owner = THIS_MODULE, 211 .release = hidp_sock_release, 212 .ioctl = hidp_sock_ioctl, 213 #ifdef CONFIG_COMPAT 214 .compat_ioctl = hidp_sock_compat_ioctl, 215 #endif 216 .bind = sock_no_bind, 217 .getname = sock_no_getname, 218 .sendmsg = sock_no_sendmsg, 219 .recvmsg = sock_no_recvmsg, 220 .poll = sock_no_poll, 221 .listen = sock_no_listen, 222 .shutdown = sock_no_shutdown, 223 .setsockopt = sock_no_setsockopt, 224 .getsockopt = sock_no_getsockopt, 225 .connect = sock_no_connect, 226 .socketpair = sock_no_socketpair, 227 .accept = sock_no_accept, 228 .mmap = sock_no_mmap 229 }; 230 231 static struct proto hidp_proto = { 232 .name = "HIDP", 233 .owner = THIS_MODULE, 234 .obj_size = sizeof(struct bt_sock) 235 }; 236 237 static int hidp_sock_create(struct net *net, struct socket *sock, int protocol, 238 int kern) 239 { 240 struct sock *sk; 241 242 BT_DBG("sock %p", sock); 243 244 if (sock->type != SOCK_RAW) 245 return -ESOCKTNOSUPPORT; 246 247 sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hidp_proto); 248 if (!sk) 249 return -ENOMEM; 250 251 sock_init_data(sock, sk); 252 253 sock->ops = &hidp_sock_ops; 254 255 sock->state = SS_UNCONNECTED; 256 257 sock_reset_flag(sk, SOCK_ZAPPED); 258 259 sk->sk_protocol = protocol; 260 sk->sk_state = BT_OPEN; 261 262 bt_sock_link(&hidp_sk_list, sk); 263 264 return 0; 265 } 266 267 static const struct net_proto_family hidp_sock_family_ops = { 268 .family = PF_BLUETOOTH, 269 .owner = THIS_MODULE, 270 .create = hidp_sock_create 271 }; 272 273 int __init hidp_init_sockets(void) 274 { 275 int err; 276 277 err = proto_register(&hidp_proto, 0); 278 if (err < 0) 279 return err; 280 281 err = bt_sock_register(BTPROTO_HIDP, &hidp_sock_family_ops); 282 if (err < 0) { 283 BT_ERR("Can't register HIDP socket"); 284 goto error; 285 } 286 287 err = bt_procfs_init(THIS_MODULE, &init_net, "hidp", &hidp_sk_list, NULL); 288 if (err < 0) { 289 BT_ERR("Failed to create HIDP proc file"); 290 bt_sock_unregister(BTPROTO_HIDP); 291 goto error; 292 } 293 294 BT_INFO("HIDP socket layer initialized"); 295 296 return 0; 297 298 error: 299 BT_ERR("Can't register HIDP socket"); 300 proto_unregister(&hidp_proto); 301 return err; 302 } 303 304 void __exit hidp_cleanup_sockets(void) 305 { 306 bt_procfs_cleanup(&init_net, "hidp"); 307 if (bt_sock_unregister(BTPROTO_HIDP) < 0) 308 BT_ERR("Can't unregister HIDP socket"); 309 310 proto_unregister(&hidp_proto); 311 } 312