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 do_cmtp_sock_ioctl(struct socket *sock, unsigned int cmd, void __user *argp) 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 int err; 74 75 BT_DBG("cmd %x arg %p", cmd, argp); 76 77 switch (cmd) { 78 case CMTPCONNADD: 79 if (!capable(CAP_NET_ADMIN)) 80 return -EPERM; 81 82 if (copy_from_user(&ca, argp, sizeof(ca))) 83 return -EFAULT; 84 85 nsock = sockfd_lookup(ca.sock, &err); 86 if (!nsock) 87 return err; 88 89 if (nsock->sk->sk_state != BT_CONNECTED) { 90 sockfd_put(nsock); 91 return -EBADFD; 92 } 93 94 err = cmtp_add_connection(&ca, nsock); 95 if (!err) { 96 if (copy_to_user(argp, &ca, sizeof(ca))) 97 err = -EFAULT; 98 } else 99 sockfd_put(nsock); 100 101 return err; 102 103 case CMTPCONNDEL: 104 if (!capable(CAP_NET_ADMIN)) 105 return -EPERM; 106 107 if (copy_from_user(&cd, argp, sizeof(cd))) 108 return -EFAULT; 109 110 return cmtp_del_connection(&cd); 111 112 case CMTPGETCONNLIST: 113 if (copy_from_user(&cl, argp, sizeof(cl))) 114 return -EFAULT; 115 116 if (cl.cnum <= 0) 117 return -EINVAL; 118 119 err = cmtp_get_connlist(&cl); 120 if (!err && copy_to_user(argp, &cl, sizeof(cl))) 121 return -EFAULT; 122 123 return err; 124 125 case CMTPGETCONNINFO: 126 if (copy_from_user(&ci, argp, sizeof(ci))) 127 return -EFAULT; 128 129 err = cmtp_get_conninfo(&ci); 130 if (!err && copy_to_user(argp, &ci, sizeof(ci))) 131 return -EFAULT; 132 133 return err; 134 } 135 136 return -EINVAL; 137 } 138 139 static int cmtp_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 140 { 141 return do_cmtp_sock_ioctl(sock, cmd, (void __user *)arg); 142 } 143 144 #ifdef CONFIG_COMPAT 145 static int cmtp_sock_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 146 { 147 void __user *argp = compat_ptr(arg); 148 if (cmd == CMTPGETCONNLIST) { 149 struct cmtp_connlist_req cl; 150 u32 __user *p = argp; 151 u32 uci; 152 int err; 153 154 if (get_user(cl.cnum, p) || get_user(uci, p + 1)) 155 return -EFAULT; 156 157 cl.ci = compat_ptr(uci); 158 159 if (cl.cnum <= 0) 160 return -EINVAL; 161 162 err = cmtp_get_connlist(&cl); 163 164 if (!err && put_user(cl.cnum, p)) 165 err = -EFAULT; 166 167 return err; 168 } 169 170 return do_cmtp_sock_ioctl(sock, cmd, argp); 171 } 172 #endif 173 174 static const struct proto_ops cmtp_sock_ops = { 175 .family = PF_BLUETOOTH, 176 .owner = THIS_MODULE, 177 .release = cmtp_sock_release, 178 .ioctl = cmtp_sock_ioctl, 179 #ifdef CONFIG_COMPAT 180 .compat_ioctl = cmtp_sock_compat_ioctl, 181 #endif 182 .bind = sock_no_bind, 183 .getname = sock_no_getname, 184 .sendmsg = sock_no_sendmsg, 185 .recvmsg = sock_no_recvmsg, 186 .listen = sock_no_listen, 187 .shutdown = sock_no_shutdown, 188 .connect = sock_no_connect, 189 .socketpair = sock_no_socketpair, 190 .accept = sock_no_accept, 191 .mmap = sock_no_mmap 192 }; 193 194 static struct proto cmtp_proto = { 195 .name = "CMTP", 196 .owner = THIS_MODULE, 197 .obj_size = sizeof(struct bt_sock) 198 }; 199 200 static int cmtp_sock_create(struct net *net, struct socket *sock, int protocol, 201 int kern) 202 { 203 struct sock *sk; 204 205 BT_DBG("sock %p", sock); 206 207 if (sock->type != SOCK_RAW) 208 return -ESOCKTNOSUPPORT; 209 210 sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &cmtp_proto, kern); 211 if (!sk) 212 return -ENOMEM; 213 214 sock_init_data(sock, sk); 215 216 sock->ops = &cmtp_sock_ops; 217 218 sock->state = SS_UNCONNECTED; 219 220 sock_reset_flag(sk, SOCK_ZAPPED); 221 222 sk->sk_protocol = protocol; 223 sk->sk_state = BT_OPEN; 224 225 bt_sock_link(&cmtp_sk_list, sk); 226 227 return 0; 228 } 229 230 static const struct net_proto_family cmtp_sock_family_ops = { 231 .family = PF_BLUETOOTH, 232 .owner = THIS_MODULE, 233 .create = cmtp_sock_create 234 }; 235 236 int cmtp_init_sockets(void) 237 { 238 int err; 239 240 err = proto_register(&cmtp_proto, 0); 241 if (err < 0) 242 return err; 243 244 err = bt_sock_register(BTPROTO_CMTP, &cmtp_sock_family_ops); 245 if (err < 0) { 246 BT_ERR("Can't register CMTP socket"); 247 goto error; 248 } 249 250 err = bt_procfs_init(&init_net, "cmtp", &cmtp_sk_list, NULL); 251 if (err < 0) { 252 BT_ERR("Failed to create CMTP proc file"); 253 bt_sock_unregister(BTPROTO_HIDP); 254 goto error; 255 } 256 257 BT_INFO("CMTP socket layer initialized"); 258 259 return 0; 260 261 error: 262 proto_unregister(&cmtp_proto); 263 return err; 264 } 265 266 void cmtp_cleanup_sockets(void) 267 { 268 bt_procfs_cleanup(&init_net, "cmtp"); 269 bt_sock_unregister(BTPROTO_CMTP); 270 proto_unregister(&cmtp_proto); 271 } 272