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/module.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/slab.h>
30 #include <linux/poll.h>
31 #include <linux/fcntl.h>
32 #include <linux/skbuff.h>
33 #include <linux/socket.h>
34 #include <linux/ioctl.h>
35 #include <linux/file.h>
36 #include <linux/init.h>
37 #include <linux/compat.h>
38 #include <net/sock.h>
39
40 #include "hidp.h"
41
42 #ifndef CONFIG_BT_HIDP_DEBUG
43 #undef BT_DBG
44 #define BT_DBG(D...)
45 #endif
46
47 static int hidp_sock_release(struct socket *sock)
48 {
49 struct sock *sk = sock->sk;
50
51 BT_DBG("sock %p sk %p", sock, sk);
52
53 if (!sk)
54 return 0;
55
56 sock_orphan(sk);
57 sock_put(sk);
58
59 return 0;
60 }
61
62 static int hidp_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
63 {
64 void __user *argp = (void __user *) arg;
65 struct hidp_connadd_req ca;
66 struct hidp_conndel_req cd;
67 struct hidp_connlist_req cl;
68 struct hidp_conninfo ci;
69 struct socket *csock;
70 struct socket *isock;
71 int err;
72
73 BT_DBG("cmd %x arg %lx", cmd, arg);
74
75 switch (cmd) {
76 case HIDPCONNADD:
77 if (!capable(CAP_NET_ADMIN))
78 return -EACCES;
79
80 if (copy_from_user(&ca, argp, sizeof(ca)))
81 return -EFAULT;
82
83 csock = sockfd_lookup(ca.ctrl_sock, &err);
84 if (!csock)
85 return err;
86
87 isock = sockfd_lookup(ca.intr_sock, &err);
88 if (!isock) {
89 sockfd_put(csock);
90 return err;
91 }
92
93 if (csock->sk->sk_state != BT_CONNECTED || isock->sk->sk_state != BT_CONNECTED) {
94 sockfd_put(csock);
95 sockfd_put(isock);
96 return -EBADFD;
97 }
98
99 err = hidp_add_connection(&ca, csock, isock);
100 if (!err) {
101 if (copy_to_user(argp, &ca, sizeof(ca)))
102 err = -EFAULT;
103 } else {
104 sockfd_put(csock);
105 sockfd_put(isock);
106 }
107
108 return err;
109
110 case HIDPCONNDEL:
111 if (!capable(CAP_NET_ADMIN))
112 return -EACCES;
113
114 if (copy_from_user(&cd, argp, sizeof(cd)))
115 return -EFAULT;
116
117 return hidp_del_connection(&cd);
118
119 case HIDPGETCONNLIST:
120 if (copy_from_user(&cl, argp, sizeof(cl)))
121 return -EFAULT;
122
123 if (cl.cnum <= 0)
124 return -EINVAL;
125
126 err = hidp_get_connlist(&cl);
127 if (!err && copy_to_user(argp, &cl, sizeof(cl)))
128 return -EFAULT;
129
130 return err;
131
132 case HIDPGETCONNINFO:
133 if (copy_from_user(&ci, argp, sizeof(ci)))
134 return -EFAULT;
135
136 err = hidp_get_conninfo(&ci);
137 if (!err && copy_to_user(argp, &ci, sizeof(ci)))
138 return -EFAULT;
139
140 return err;
141 }
142
143 return -EINVAL;
144 }
145
146 #ifdef CONFIG_COMPAT
147 struct compat_hidp_connadd_req {
148 int ctrl_sock; // Connected control socket
149 int intr_sock; // Connteted interrupt socket
150 __u16 parser;
151 __u16 rd_size;
152 compat_uptr_t rd_data;
153 __u8 country;
154 __u8 subclass;
155 __u16 vendor;
156 __u16 product;
157 __u16 version;
158 __u32 flags;
159 __u32 idle_to;
160 char name[128];
161 };
162
163 static int hidp_sock_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
164 {
165 if (cmd == HIDPGETCONNLIST) {
166 struct hidp_connlist_req cl;
167 uint32_t uci;
168 int err;
169
170 if (get_user(cl.cnum, (uint32_t __user *) arg) ||
171 get_user(uci, (u32 __user *) (arg + 4)))
172 return -EFAULT;
173
174 cl.ci = compat_ptr(uci);
175
176 if (cl.cnum <= 0)
177 return -EINVAL;
178
179 err = hidp_get_connlist(&cl);
180
181 if (!err && put_user(cl.cnum, (uint32_t __user *) arg))
182 err = -EFAULT;
183
184 return err;
185 } else if (cmd == HIDPCONNADD) {
186 struct compat_hidp_connadd_req ca;
187 struct hidp_connadd_req __user *uca;
188
189 uca = compat_alloc_user_space(sizeof(*uca));
190
191 if (copy_from_user(&ca, (void __user *) arg, sizeof(ca)))
192 return -EFAULT;
193
194 if (put_user(ca.ctrl_sock, &uca->ctrl_sock) ||
195 put_user(ca.intr_sock, &uca->intr_sock) ||
196 put_user(ca.parser, &uca->parser) ||
197 put_user(ca.rd_size, &uca->rd_size) ||
198 put_user(compat_ptr(ca.rd_data), &uca->rd_data) ||
199 put_user(ca.country, &uca->country) ||
200 put_user(ca.subclass, &uca->subclass) ||
201 put_user(ca.vendor, &uca->vendor) ||
202 put_user(ca.product, &uca->product) ||
203 put_user(ca.version, &uca->version) ||
204 put_user(ca.flags, &uca->flags) ||
205 put_user(ca.idle_to, &uca->idle_to) ||
206 copy_to_user(&uca->name[0], &ca.name[0], 128))
207 return -EFAULT;
208
209 arg = (unsigned long) uca;
210
211 /* Fall through. We don't actually write back any _changes_
212 to the structure anyway, so there's no need to copy back
213 into the original compat version */
214 }
215
216 return hidp_sock_ioctl(sock, cmd, arg);
217 }
218 #endif
219
220 static const struct proto_ops hidp_sock_ops = {
221 .family = PF_BLUETOOTH,
222 .owner = THIS_MODULE,
223 .release = hidp_sock_release,
224 .ioctl = hidp_sock_ioctl,
225 #ifdef CONFIG_COMPAT
226 .compat_ioctl = hidp_sock_compat_ioctl,
227 #endif
228 .bind = sock_no_bind,
229 .getname = sock_no_getname,
230 .sendmsg = sock_no_sendmsg,
231 .recvmsg = sock_no_recvmsg,
232 .poll = sock_no_poll,
233 .listen = sock_no_listen,
234 .shutdown = sock_no_shutdown,
235 .setsockopt = sock_no_setsockopt,
236 .getsockopt = sock_no_getsockopt,
237 .connect = sock_no_connect,
238 .socketpair = sock_no_socketpair,
239 .accept = sock_no_accept,
240 .mmap = sock_no_mmap
241 };
242
243 static struct proto hidp_proto = {
244 .name = "HIDP",
245 .owner = THIS_MODULE,
246 .obj_size = sizeof(struct bt_sock)
247 };
248
249 static int hidp_sock_create(struct net *net, struct socket *sock, int protocol)
250 {
251 struct sock *sk;
252
253 BT_DBG("sock %p", sock);
254
255 if (sock->type != SOCK_RAW)
256 return -ESOCKTNOSUPPORT;
257
258 sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hidp_proto);
259 if (!sk)
260 return -ENOMEM;
261
262 sock_init_data(sock, sk);
263
264 sock->ops = &hidp_sock_ops;
265
266 sock->state = SS_UNCONNECTED;
267
268 sock_reset_flag(sk, SOCK_ZAPPED);
269
270 sk->sk_protocol = protocol;
271 sk->sk_state = BT_OPEN;
272
273 return 0;
274 }
275
276 static struct net_proto_family hidp_sock_family_ops = {
277 .family = PF_BLUETOOTH,
278 .owner = THIS_MODULE,
279 .create = hidp_sock_create
280 };
281
282 int __init hidp_init_sockets(void)
283 {
284 int err;
285
286 err = proto_register(&hidp_proto, 0);
287 if (err < 0)
288 return err;
289
290 err = bt_sock_register(BTPROTO_HIDP, &hidp_sock_family_ops);
291 if (err < 0)
292 goto error;
293
294 return 0;
295
296 error:
297 BT_ERR("Can't register HIDP socket");
298 proto_unregister(&hidp_proto);
299 return err;
300 }
301
302 void __exit hidp_cleanup_sockets(void)
303 {
304 if (bt_sock_unregister(BTPROTO_HIDP) < 0)
305 BT_ERR("Can't unregister HIDP socket");
306
307 proto_unregister(&hidp_proto);
308 }
309
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