1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 BNEP implementation for Linux Bluetooth stack (BlueZ). 4 Copyright (C) 2001-2002 Inventel Systemes 5 Written 2001-2002 by 6 David Libault <david.libault@inventel.fr> 7 8 Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com> 9 10 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 11 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 12 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. 13 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY 14 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 15 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 19 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 20 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 21 SOFTWARE IS DISCLAIMED. 22 */ 23 24 #include <linux/compat.h> 25 #include <linux/export.h> 26 #include <linux/file.h> 27 28 #include "bnep.h" 29 30 static struct bt_sock_list bnep_sk_list = { 31 .lock = __RW_LOCK_UNLOCKED(bnep_sk_list.lock) 32 }; 33 34 static int bnep_sock_release(struct socket *sock) 35 { 36 struct sock *sk = sock->sk; 37 38 BT_DBG("sock %p sk %p", sock, sk); 39 40 if (!sk) 41 return 0; 42 43 bt_sock_unlink(&bnep_sk_list, sk); 44 45 sock_orphan(sk); 46 sock_put(sk); 47 return 0; 48 } 49 50 static int do_bnep_sock_ioctl(struct socket *sock, unsigned int cmd, void __user *argp) 51 { 52 struct bnep_connlist_req cl; 53 struct bnep_connadd_req ca; 54 struct bnep_conndel_req cd; 55 struct bnep_conninfo ci; 56 struct socket *nsock; 57 __u32 supp_feat = BIT(BNEP_SETUP_RESPONSE); 58 int err; 59 60 BT_DBG("cmd %x arg %p", cmd, argp); 61 62 switch (cmd) { 63 case BNEPCONNADD: 64 if (!capable(CAP_NET_ADMIN)) 65 return -EPERM; 66 67 if (copy_from_user(&ca, argp, sizeof(ca))) 68 return -EFAULT; 69 70 nsock = sockfd_lookup(ca.sock, &err); 71 if (!nsock) 72 return err; 73 74 if (nsock->sk->sk_state != BT_CONNECTED) { 75 sockfd_put(nsock); 76 return -EBADFD; 77 } 78 ca.device[sizeof(ca.device)-1] = 0; 79 80 err = bnep_add_connection(&ca, nsock); 81 if (!err) { 82 if (copy_to_user(argp, &ca, sizeof(ca))) 83 err = -EFAULT; 84 } else 85 sockfd_put(nsock); 86 87 return err; 88 89 case BNEPCONNDEL: 90 if (!capable(CAP_NET_ADMIN)) 91 return -EPERM; 92 93 if (copy_from_user(&cd, argp, sizeof(cd))) 94 return -EFAULT; 95 96 return bnep_del_connection(&cd); 97 98 case BNEPGETCONNLIST: 99 if (copy_from_user(&cl, argp, sizeof(cl))) 100 return -EFAULT; 101 102 if (cl.cnum <= 0) 103 return -EINVAL; 104 105 err = bnep_get_connlist(&cl); 106 if (!err && copy_to_user(argp, &cl, sizeof(cl))) 107 return -EFAULT; 108 109 return err; 110 111 case BNEPGETCONNINFO: 112 if (copy_from_user(&ci, argp, sizeof(ci))) 113 return -EFAULT; 114 115 err = bnep_get_conninfo(&ci); 116 if (!err && copy_to_user(argp, &ci, sizeof(ci))) 117 return -EFAULT; 118 119 return err; 120 121 case BNEPGETSUPPFEAT: 122 if (copy_to_user(argp, &supp_feat, sizeof(supp_feat))) 123 return -EFAULT; 124 125 return 0; 126 127 default: 128 return -EINVAL; 129 } 130 131 return 0; 132 } 133 134 static int bnep_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 135 { 136 return do_bnep_sock_ioctl(sock, cmd, (void __user *)arg); 137 } 138 139 #ifdef CONFIG_COMPAT 140 static int bnep_sock_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 141 { 142 void __user *argp = compat_ptr(arg); 143 if (cmd == BNEPGETCONNLIST) { 144 struct bnep_connlist_req cl; 145 unsigned __user *p = argp; 146 u32 uci; 147 int err; 148 149 if (get_user(cl.cnum, p) || get_user(uci, p + 1)) 150 return -EFAULT; 151 152 cl.ci = compat_ptr(uci); 153 154 if (cl.cnum <= 0) 155 return -EINVAL; 156 157 err = bnep_get_connlist(&cl); 158 159 if (!err && put_user(cl.cnum, p)) 160 err = -EFAULT; 161 162 return err; 163 } 164 165 return do_bnep_sock_ioctl(sock, cmd, argp); 166 } 167 #endif 168 169 static const struct proto_ops bnep_sock_ops = { 170 .family = PF_BLUETOOTH, 171 .owner = THIS_MODULE, 172 .release = bnep_sock_release, 173 .ioctl = bnep_sock_ioctl, 174 #ifdef CONFIG_COMPAT 175 .compat_ioctl = bnep_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 .connect = sock_no_connect, 184 .socketpair = sock_no_socketpair, 185 .accept = sock_no_accept, 186 .mmap = sock_no_mmap 187 }; 188 189 static struct proto bnep_proto = { 190 .name = "BNEP", 191 .owner = THIS_MODULE, 192 .obj_size = sizeof(struct bt_sock) 193 }; 194 195 static int bnep_sock_create(struct net *net, struct socket *sock, int protocol, 196 int kern) 197 { 198 struct sock *sk; 199 200 BT_DBG("sock %p", sock); 201 202 if (sock->type != SOCK_RAW) 203 return -ESOCKTNOSUPPORT; 204 205 sk = bt_sock_alloc(net, sock, &bnep_proto, protocol, GFP_ATOMIC, kern); 206 if (!sk) 207 return -ENOMEM; 208 209 sock->ops = &bnep_sock_ops; 210 sock->state = SS_UNCONNECTED; 211 212 bt_sock_link(&bnep_sk_list, sk); 213 return 0; 214 } 215 216 static const struct net_proto_family bnep_sock_family_ops = { 217 .family = PF_BLUETOOTH, 218 .owner = THIS_MODULE, 219 .create = bnep_sock_create 220 }; 221 222 int __init bnep_sock_init(void) 223 { 224 int err; 225 226 err = proto_register(&bnep_proto, 0); 227 if (err < 0) 228 return err; 229 230 err = bt_sock_register(BTPROTO_BNEP, &bnep_sock_family_ops); 231 if (err < 0) { 232 BT_ERR("Can't register BNEP socket"); 233 goto error; 234 } 235 236 err = bt_procfs_init(&init_net, "bnep", &bnep_sk_list, NULL); 237 if (err < 0) { 238 BT_ERR("Failed to create BNEP proc file"); 239 bt_sock_unregister(BTPROTO_BNEP); 240 goto error; 241 } 242 243 BT_INFO("BNEP socket layer initialized"); 244 245 return 0; 246 247 error: 248 proto_unregister(&bnep_proto); 249 return err; 250 } 251 252 void __exit bnep_sock_cleanup(void) 253 { 254 bt_procfs_cleanup(&init_net, "bnep"); 255 bt_sock_unregister(BTPROTO_BNEP); 256 proto_unregister(&bnep_proto); 257 } 258