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
28 static struct bt_sock_list hidp_sk_list = {
29 .lock = __RW_LOCK_UNLOCKED(hidp_sk_list.lock)
30 };
31
hidp_sock_release(struct socket * sock)32 static 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
hidp_sock_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)49 static 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
126 struct 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
hidp_sock_compat_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)142 static 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
199 static 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 .listen = sock_no_listen,
212 .shutdown = sock_no_shutdown,
213 .setsockopt = sock_no_setsockopt,
214 .getsockopt = sock_no_getsockopt,
215 .connect = sock_no_connect,
216 .socketpair = sock_no_socketpair,
217 .accept = sock_no_accept,
218 .mmap = sock_no_mmap
219 };
220
221 static struct proto hidp_proto = {
222 .name = "HIDP",
223 .owner = THIS_MODULE,
224 .obj_size = sizeof(struct bt_sock)
225 };
226
hidp_sock_create(struct net * net,struct socket * sock,int protocol,int kern)227 static int hidp_sock_create(struct net *net, struct socket *sock, int protocol,
228 int kern)
229 {
230 struct sock *sk;
231
232 BT_DBG("sock %p", sock);
233
234 if (sock->type != SOCK_RAW)
235 return -ESOCKTNOSUPPORT;
236
237 sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hidp_proto, kern);
238 if (!sk)
239 return -ENOMEM;
240
241 sock_init_data(sock, sk);
242
243 sock->ops = &hidp_sock_ops;
244
245 sock->state = SS_UNCONNECTED;
246
247 sock_reset_flag(sk, SOCK_ZAPPED);
248
249 sk->sk_protocol = protocol;
250 sk->sk_state = BT_OPEN;
251
252 bt_sock_link(&hidp_sk_list, sk);
253
254 return 0;
255 }
256
257 static const struct net_proto_family hidp_sock_family_ops = {
258 .family = PF_BLUETOOTH,
259 .owner = THIS_MODULE,
260 .create = hidp_sock_create
261 };
262
hidp_init_sockets(void)263 int __init hidp_init_sockets(void)
264 {
265 int err;
266
267 err = proto_register(&hidp_proto, 0);
268 if (err < 0)
269 return err;
270
271 err = bt_sock_register(BTPROTO_HIDP, &hidp_sock_family_ops);
272 if (err < 0) {
273 BT_ERR("Can't register HIDP socket");
274 goto error;
275 }
276
277 err = bt_procfs_init(&init_net, "hidp", &hidp_sk_list, NULL);
278 if (err < 0) {
279 BT_ERR("Failed to create HIDP proc file");
280 bt_sock_unregister(BTPROTO_HIDP);
281 goto error;
282 }
283
284 BT_INFO("HIDP socket layer initialized");
285
286 return 0;
287
288 error:
289 proto_unregister(&hidp_proto);
290 return err;
291 }
292
hidp_cleanup_sockets(void)293 void __exit hidp_cleanup_sockets(void)
294 {
295 bt_procfs_cleanup(&init_net, "hidp");
296 bt_sock_unregister(BTPROTO_HIDP);
297 proto_unregister(&hidp_proto);
298 }
299
