xref: /openbmc/linux/net/bluetooth/bnep/sock.c (revision 9ac8d3fb)
1 /*
2    BNEP implementation for Linux Bluetooth stack (BlueZ).
3    Copyright (C) 2001-2002 Inventel Systemes
4    Written 2001-2002 by
5 	David Libault  <david.libault@inventel.fr>
6 
7    Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>
8 
9    This program is free software; you can redistribute it and/or modify
10    it under the terms of the GNU General Public License version 2 as
11    published by the Free Software Foundation;
12 
13    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
14    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
16    IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
17    CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
18    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
19    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
20    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21 
22    ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
23    COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
24    SOFTWARE IS DISCLAIMED.
25 */
26 
27 #include <linux/module.h>
28 
29 #include <linux/types.h>
30 #include <linux/capability.h>
31 #include <linux/errno.h>
32 #include <linux/kernel.h>
33 #include <linux/slab.h>
34 #include <linux/poll.h>
35 #include <linux/fcntl.h>
36 #include <linux/skbuff.h>
37 #include <linux/socket.h>
38 #include <linux/ioctl.h>
39 #include <linux/file.h>
40 #include <linux/init.h>
41 #include <linux/compat.h>
42 #include <net/sock.h>
43 
44 #include <asm/system.h>
45 #include <asm/uaccess.h>
46 
47 #include "bnep.h"
48 
49 #ifndef CONFIG_BT_BNEP_DEBUG
50 #undef  BT_DBG
51 #define BT_DBG( A... )
52 #endif
53 
54 static int bnep_sock_release(struct socket *sock)
55 {
56 	struct sock *sk = sock->sk;
57 
58 	BT_DBG("sock %p sk %p", sock, sk);
59 
60 	if (!sk)
61 		return 0;
62 
63 	sock_orphan(sk);
64 	sock_put(sk);
65 	return 0;
66 }
67 
68 static int bnep_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
69 {
70 	struct bnep_connlist_req cl;
71 	struct bnep_connadd_req  ca;
72 	struct bnep_conndel_req  cd;
73 	struct bnep_conninfo ci;
74 	struct socket *nsock;
75 	void __user *argp = (void __user *)arg;
76 	int err;
77 
78 	BT_DBG("cmd %x arg %lx", cmd, arg);
79 
80 	switch (cmd) {
81 	case BNEPCONNADD:
82 		if (!capable(CAP_NET_ADMIN))
83 			return -EACCES;
84 
85 		if (copy_from_user(&ca, argp, sizeof(ca)))
86 			return -EFAULT;
87 
88 		nsock = sockfd_lookup(ca.sock, &err);
89 		if (!nsock)
90 			return err;
91 
92 		if (nsock->sk->sk_state != BT_CONNECTED) {
93 			sockfd_put(nsock);
94 			return -EBADFD;
95 		}
96 
97 		err = bnep_add_connection(&ca, nsock);
98 		if (!err) {
99 			if (copy_to_user(argp, &ca, sizeof(ca)))
100 				err = -EFAULT;
101 		} else
102 			sockfd_put(nsock);
103 
104 		return err;
105 
106 	case BNEPCONNDEL:
107 		if (!capable(CAP_NET_ADMIN))
108 			return -EACCES;
109 
110 		if (copy_from_user(&cd, argp, sizeof(cd)))
111 			return -EFAULT;
112 
113 		return bnep_del_connection(&cd);
114 
115 	case BNEPGETCONNLIST:
116 		if (copy_from_user(&cl, argp, sizeof(cl)))
117 			return -EFAULT;
118 
119 		if (cl.cnum <= 0)
120 			return -EINVAL;
121 
122 		err = bnep_get_connlist(&cl);
123 		if (!err && copy_to_user(argp, &cl, sizeof(cl)))
124 			return -EFAULT;
125 
126 		return err;
127 
128 	case BNEPGETCONNINFO:
129 		if (copy_from_user(&ci, argp, sizeof(ci)))
130 			return -EFAULT;
131 
132 		err = bnep_get_conninfo(&ci);
133 		if (!err && copy_to_user(argp, &ci, sizeof(ci)))
134 			return -EFAULT;
135 
136 		return err;
137 
138 	default:
139 		return -EINVAL;
140 	}
141 
142 	return 0;
143 }
144 
145 #ifdef CONFIG_COMPAT
146 static int bnep_sock_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
147 {
148 	if (cmd == BNEPGETCONNLIST) {
149 		struct bnep_connlist_req cl;
150 		uint32_t uci;
151 		int err;
152 
153 		if (get_user(cl.cnum, (uint32_t __user *) arg) ||
154 				get_user(uci, (u32 __user *) (arg + 4)))
155 			return -EFAULT;
156 
157 		cl.ci = compat_ptr(uci);
158 
159 		if (cl.cnum <= 0)
160 			return -EINVAL;
161 
162 		err = bnep_get_connlist(&cl);
163 
164 		if (!err && put_user(cl.cnum, (uint32_t __user *) arg))
165 			err = -EFAULT;
166 
167 		return err;
168 	}
169 
170 	return bnep_sock_ioctl(sock, cmd, arg);
171 }
172 #endif
173 
174 static const struct proto_ops bnep_sock_ops = {
175 	.family		= PF_BLUETOOTH,
176 	.owner		= THIS_MODULE,
177 	.release	= bnep_sock_release,
178 	.ioctl		= bnep_sock_ioctl,
179 #ifdef CONFIG_COMPAT
180 	.compat_ioctl	= bnep_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 	.poll		= sock_no_poll,
187 	.listen		= sock_no_listen,
188 	.shutdown	= sock_no_shutdown,
189 	.setsockopt	= sock_no_setsockopt,
190 	.getsockopt	= sock_no_getsockopt,
191 	.connect	= sock_no_connect,
192 	.socketpair	= sock_no_socketpair,
193 	.accept		= sock_no_accept,
194 	.mmap		= sock_no_mmap
195 };
196 
197 static struct proto bnep_proto = {
198 	.name		= "BNEP",
199 	.owner		= THIS_MODULE,
200 	.obj_size	= sizeof(struct bt_sock)
201 };
202 
203 static int bnep_sock_create(struct net *net, struct socket *sock, int protocol)
204 {
205 	struct sock *sk;
206 
207 	BT_DBG("sock %p", sock);
208 
209 	if (sock->type != SOCK_RAW)
210 		return -ESOCKTNOSUPPORT;
211 
212 	sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &bnep_proto);
213 	if (!sk)
214 		return -ENOMEM;
215 
216 	sock_init_data(sock, sk);
217 
218 	sock->ops = &bnep_sock_ops;
219 
220 	sock->state = SS_UNCONNECTED;
221 
222 	sock_reset_flag(sk, SOCK_ZAPPED);
223 
224 	sk->sk_protocol = protocol;
225 	sk->sk_state	= BT_OPEN;
226 
227 	return 0;
228 }
229 
230 static struct net_proto_family bnep_sock_family_ops = {
231 	.family = PF_BLUETOOTH,
232 	.owner	= THIS_MODULE,
233 	.create = bnep_sock_create
234 };
235 
236 int __init bnep_sock_init(void)
237 {
238 	int err;
239 
240 	err = proto_register(&bnep_proto, 0);
241 	if (err < 0)
242 		return err;
243 
244 	err = bt_sock_register(BTPROTO_BNEP, &bnep_sock_family_ops);
245 	if (err < 0)
246 		goto error;
247 
248 	return 0;
249 
250 error:
251 	BT_ERR("Can't register BNEP socket");
252 	proto_unregister(&bnep_proto);
253 	return err;
254 }
255 
256 void __exit bnep_sock_cleanup(void)
257 {
258 	if (bt_sock_unregister(BTPROTO_BNEP) < 0)
259 		BT_ERR("Can't unregister BNEP socket");
260 
261 	proto_unregister(&bnep_proto);
262 }
263