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
28static struct bt_sock_list hidp_sk_list = {
29	.lock = __RW_LOCK_UNLOCKED(hidp_sk_list.lock)
30};
31
32static 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
49static 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		err = hidp_connection_add(&ca, csock, isock);
81		if (!err && copy_to_user(argp, &ca, sizeof(ca)))
82			err = -EFAULT;
83
84		sockfd_put(csock);
85		sockfd_put(isock);
86
87		return err;
88
89	case HIDPCONNDEL:
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 hidp_connection_del(&cd);
97
98	case HIDPGETCONNLIST:
99		if (copy_from_user(&cl, argp, sizeof(cl)))
100			return -EFAULT;
101
102		if (cl.cnum <= 0)
103			return -EINVAL;
104
105		err = hidp_get_connlist(&cl);
106		if (!err && copy_to_user(argp, &cl, sizeof(cl)))
107			return -EFAULT;
108
109		return err;
110
111	case HIDPGETCONNINFO:
112		if (copy_from_user(&ci, argp, sizeof(ci)))
113			return -EFAULT;
114
115		err = hidp_get_conninfo(&ci);
116		if (!err && copy_to_user(argp, &ci, sizeof(ci)))
117			return -EFAULT;
118
119		return err;
120	}
121
122	return -EINVAL;
123}
124
125#ifdef CONFIG_COMPAT
126struct compat_hidp_connadd_req {
127	int   ctrl_sock;	/* Connected control socket */
128	int   intr_sock;	/* Connected interrupt socket */
129	__u16 parser;
130	__u16 rd_size;
131	compat_uptr_t rd_data;
132	__u8  country;
133	__u8  subclass;
134	__u16 vendor;
135	__u16 product;
136	__u16 version;
137	__u32 flags;
138	__u32 idle_to;
139	char  name[128];
140};
141
142static int hidp_sock_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
143{
144	if (cmd == HIDPGETCONNLIST) {
145		struct hidp_connlist_req cl;
146		u32 uci;
147		int err;
148
149		if (get_user(cl.cnum, (u32 __user *) arg) ||
150				get_user(uci, (u32 __user *) (arg + 4)))
151			return -EFAULT;
152
153		cl.ci = compat_ptr(uci);
154
155		if (cl.cnum <= 0)
156			return -EINVAL;
157
158		err = hidp_get_connlist(&cl);
159
160		if (!err && put_user(cl.cnum, (u32 __user *) arg))
161			err = -EFAULT;
162
163		return err;
164	} else if (cmd == HIDPCONNADD) {
165		struct compat_hidp_connadd_req ca;
166		struct hidp_connadd_req __user *uca;
167
168		uca = compat_alloc_user_space(sizeof(*uca));
169
170		if (copy_from_user(&ca, (void __user *) arg, sizeof(ca)))
171			return -EFAULT;
172
173		if (put_user(ca.ctrl_sock, &uca->ctrl_sock) ||
174				put_user(ca.intr_sock, &uca->intr_sock) ||
175				put_user(ca.parser, &uca->parser) ||
176				put_user(ca.rd_size, &uca->rd_size) ||
177				put_user(compat_ptr(ca.rd_data), &uca->rd_data) ||
178				put_user(ca.country, &uca->country) ||
179				put_user(ca.subclass, &uca->subclass) ||
180				put_user(ca.vendor, &uca->vendor) ||
181				put_user(ca.product, &uca->product) ||
182				put_user(ca.version, &uca->version) ||
183				put_user(ca.flags, &uca->flags) ||
184				put_user(ca.idle_to, &uca->idle_to) ||
185				copy_to_user(&uca->name[0], &ca.name[0], 128))
186			return -EFAULT;
187
188		arg = (unsigned long) uca;
189
190		/* Fall through. We don't actually write back any _changes_
191		   to the structure anyway, so there's no need to copy back
192		   into the original compat version */
193	}
194
195	return hidp_sock_ioctl(sock, cmd, arg);
196}
197#endif
198
199static const struct proto_ops hidp_sock_ops = {
200	.family		= PF_BLUETOOTH,
201	.owner		= THIS_MODULE,
202	.release	= hidp_sock_release,
203	.ioctl		= hidp_sock_ioctl,
204#ifdef CONFIG_COMPAT
205	.compat_ioctl	= hidp_sock_compat_ioctl,
206#endif
207	.bind		= sock_no_bind,
208	.getname	= sock_no_getname,
209	.sendmsg	= sock_no_sendmsg,
210	.recvmsg	= sock_no_recvmsg,
211	.poll		= sock_no_poll,
212	.listen		= sock_no_listen,
213	.shutdown	= sock_no_shutdown,
214	.setsockopt	= sock_no_setsockopt,
215	.getsockopt	= sock_no_getsockopt,
216	.connect	= sock_no_connect,
217	.socketpair	= sock_no_socketpair,
218	.accept		= sock_no_accept,
219	.mmap		= sock_no_mmap
220};
221
222static struct proto hidp_proto = {
223	.name		= "HIDP",
224	.owner		= THIS_MODULE,
225	.obj_size	= sizeof(struct bt_sock)
226};
227
228static int hidp_sock_create(struct net *net, struct socket *sock, int protocol,
229			    int kern)
230{
231	struct sock *sk;
232
233	BT_DBG("sock %p", sock);
234
235	if (sock->type != SOCK_RAW)
236		return -ESOCKTNOSUPPORT;
237
238	sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hidp_proto, kern);
239	if (!sk)
240		return -ENOMEM;
241
242	sock_init_data(sock, sk);
243
244	sock->ops = &hidp_sock_ops;
245
246	sock->state = SS_UNCONNECTED;
247
248	sock_reset_flag(sk, SOCK_ZAPPED);
249
250	sk->sk_protocol = protocol;
251	sk->sk_state	= BT_OPEN;
252
253	bt_sock_link(&hidp_sk_list, sk);
254
255	return 0;
256}
257
258static const struct net_proto_family hidp_sock_family_ops = {
259	.family	= PF_BLUETOOTH,
260	.owner	= THIS_MODULE,
261	.create	= hidp_sock_create
262};
263
264int __init hidp_init_sockets(void)
265{
266	int err;
267
268	err = proto_register(&hidp_proto, 0);
269	if (err < 0)
270		return err;
271
272	err = bt_sock_register(BTPROTO_HIDP, &hidp_sock_family_ops);
273	if (err < 0) {
274		BT_ERR("Can't register HIDP socket");
275		goto error;
276	}
277
278	err = bt_procfs_init(&init_net, "hidp", &hidp_sk_list, NULL);
279	if (err < 0) {
280		BT_ERR("Failed to create HIDP proc file");
281		bt_sock_unregister(BTPROTO_HIDP);
282		goto error;
283	}
284
285	BT_INFO("HIDP socket layer initialized");
286
287	return 0;
288
289error:
290	proto_unregister(&hidp_proto);
291	return err;
292}
293
294void __exit hidp_cleanup_sockets(void)
295{
296	bt_procfs_cleanup(&init_net, "hidp");
297	bt_sock_unregister(BTPROTO_HIDP);
298	proto_unregister(&hidp_proto);
299}
300