1 /* 2 CMTP implementation for Linux Bluetooth stack (BlueZ). 3 Copyright (C) 2002-2003 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 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/compat.h> 36 #include <linux/gfp.h> 37 #include <linux/uaccess.h> 38 #include <net/sock.h> 39 40 #include <linux/isdn/capilli.h> 41 42 43 #include "cmtp.h" 44 45 static struct bt_sock_list cmtp_sk_list = { 46 .lock = __RW_LOCK_UNLOCKED(cmtp_sk_list.lock) 47 }; 48 49 static int cmtp_sock_release(struct socket *sock) 50 { 51 struct sock *sk = sock->sk; 52 53 BT_DBG("sock %p sk %p", sock, sk); 54 55 if (!sk) 56 return 0; 57 58 bt_sock_unlink(&cmtp_sk_list, sk); 59 60 sock_orphan(sk); 61 sock_put(sk); 62 63 return 0; 64 } 65 66 static int cmtp_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 67 { 68 struct cmtp_connadd_req ca; 69 struct cmtp_conndel_req cd; 70 struct cmtp_connlist_req cl; 71 struct cmtp_conninfo ci; 72 struct socket *nsock; 73 void __user *argp = (void __user *)arg; 74 int err; 75 76 BT_DBG("cmd %x arg %lx", cmd, arg); 77 78 switch (cmd) { 79 case CMTPCONNADD: 80 if (!capable(CAP_NET_ADMIN)) 81 return -EPERM; 82 83 if (copy_from_user(&ca, argp, sizeof(ca))) 84 return -EFAULT; 85 86 nsock = sockfd_lookup(ca.sock, &err); 87 if (!nsock) 88 return err; 89 90 if (nsock->sk->sk_state != BT_CONNECTED) { 91 sockfd_put(nsock); 92 return -EBADFD; 93 } 94 95 err = cmtp_add_connection(&ca, nsock); 96 if (!err) { 97 if (copy_to_user(argp, &ca, sizeof(ca))) 98 err = -EFAULT; 99 } else 100 sockfd_put(nsock); 101 102 return err; 103 104 case CMTPCONNDEL: 105 if (!capable(CAP_NET_ADMIN)) 106 return -EPERM; 107 108 if (copy_from_user(&cd, argp, sizeof(cd))) 109 return -EFAULT; 110 111 return cmtp_del_connection(&cd); 112 113 case CMTPGETCONNLIST: 114 if (copy_from_user(&cl, argp, sizeof(cl))) 115 return -EFAULT; 116 117 if (cl.cnum <= 0) 118 return -EINVAL; 119 120 err = cmtp_get_connlist(&cl); 121 if (!err && copy_to_user(argp, &cl, sizeof(cl))) 122 return -EFAULT; 123 124 return err; 125 126 case CMTPGETCONNINFO: 127 if (copy_from_user(&ci, argp, sizeof(ci))) 128 return -EFAULT; 129 130 err = cmtp_get_conninfo(&ci); 131 if (!err && copy_to_user(argp, &ci, sizeof(ci))) 132 return -EFAULT; 133 134 return err; 135 } 136 137 return -EINVAL; 138 } 139 140 #ifdef CONFIG_COMPAT 141 static int cmtp_sock_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 142 { 143 if (cmd == CMTPGETCONNLIST) { 144 struct cmtp_connlist_req cl; 145 u32 uci; 146 int err; 147 148 if (get_user(cl.cnum, (u32 __user *) arg) || 149 get_user(uci, (u32 __user *) (arg + 4))) 150 return -EFAULT; 151 152 cl.ci = compat_ptr(uci); 153 154 if (cl.cnum <= 0) 155 return -EINVAL; 156 157 err = cmtp_get_connlist(&cl); 158 159 if (!err && put_user(cl.cnum, (u32 __user *) arg)) 160 err = -EFAULT; 161 162 return err; 163 } 164 165 return cmtp_sock_ioctl(sock, cmd, arg); 166 } 167 #endif 168 169 static const struct proto_ops cmtp_sock_ops = { 170 .family = PF_BLUETOOTH, 171 .owner = THIS_MODULE, 172 .release = cmtp_sock_release, 173 .ioctl = cmtp_sock_ioctl, 174 #ifdef CONFIG_COMPAT 175 .compat_ioctl = cmtp_sock_compat_ioctl, 176 #endif 177 .bind = sock_no_bind, 178 .getname = sock_no_getname, 179 .sendmsg = sock_no_sendmsg, 180 .recvmsg = sock_no_recvmsg, 181 .listen = sock_no_listen, 182 .shutdown = sock_no_shutdown, 183 .setsockopt = sock_no_setsockopt, 184 .getsockopt = sock_no_getsockopt, 185 .connect = sock_no_connect, 186 .socketpair = sock_no_socketpair, 187 .accept = sock_no_accept, 188 .mmap = sock_no_mmap 189 }; 190 191 static struct proto cmtp_proto = { 192 .name = "CMTP", 193 .owner = THIS_MODULE, 194 .obj_size = sizeof(struct bt_sock) 195 }; 196 197 static int cmtp_sock_create(struct net *net, struct socket *sock, int protocol, 198 int kern) 199 { 200 struct sock *sk; 201 202 BT_DBG("sock %p", sock); 203 204 if (sock->type != SOCK_RAW) 205 return -ESOCKTNOSUPPORT; 206 207 sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &cmtp_proto, kern); 208 if (!sk) 209 return -ENOMEM; 210 211 sock_init_data(sock, sk); 212 213 sock->ops = &cmtp_sock_ops; 214 215 sock->state = SS_UNCONNECTED; 216 217 sock_reset_flag(sk, SOCK_ZAPPED); 218 219 sk->sk_protocol = protocol; 220 sk->sk_state = BT_OPEN; 221 222 bt_sock_link(&cmtp_sk_list, sk); 223 224 return 0; 225 } 226 227 static const struct net_proto_family cmtp_sock_family_ops = { 228 .family = PF_BLUETOOTH, 229 .owner = THIS_MODULE, 230 .create = cmtp_sock_create 231 }; 232 233 int cmtp_init_sockets(void) 234 { 235 int err; 236 237 err = proto_register(&cmtp_proto, 0); 238 if (err < 0) 239 return err; 240 241 err = bt_sock_register(BTPROTO_CMTP, &cmtp_sock_family_ops); 242 if (err < 0) { 243 BT_ERR("Can't register CMTP socket"); 244 goto error; 245 } 246 247 err = bt_procfs_init(&init_net, "cmtp", &cmtp_sk_list, NULL); 248 if (err < 0) { 249 BT_ERR("Failed to create CMTP proc file"); 250 bt_sock_unregister(BTPROTO_HIDP); 251 goto error; 252 } 253 254 BT_INFO("CMTP socket layer initialized"); 255 256 return 0; 257 258 error: 259 proto_unregister(&cmtp_proto); 260 return err; 261 } 262 263 void cmtp_cleanup_sockets(void) 264 { 265 bt_procfs_cleanup(&init_net, "cmtp"); 266 bt_sock_unregister(BTPROTO_CMTP); 267 proto_unregister(&cmtp_proto); 268 } 269