1 /*
2    BlueZ - Bluetooth protocol stack for Linux
3    Copyright (C) 2000-2001 Qualcomm Incorporated
4 
5    Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
6 
7    This program is free software; you can redistribute it and/or modify
8    it under the terms of the GNU General Public License version 2 as
9    published by the Free Software Foundation;
10 
11    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14    IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
15    CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 
20    ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21    COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
22    SOFTWARE IS DISCLAIMED.
23 */
24 
25 #ifndef __BLUETOOTH_H
26 #define __BLUETOOTH_H
27 
28 #include <linux/poll.h>
29 #include <net/sock.h>
30 #include <linux/seq_file.h>
31 
32 #define BT_SUBSYS_VERSION	2
33 #define BT_SUBSYS_REVISION	22
34 
35 #ifndef AF_BLUETOOTH
36 #define AF_BLUETOOTH	31
37 #define PF_BLUETOOTH	AF_BLUETOOTH
38 #endif
39 
40 /* Bluetooth versions */
41 #define BLUETOOTH_VER_1_1	1
42 #define BLUETOOTH_VER_1_2	2
43 #define BLUETOOTH_VER_2_0	3
44 
45 /* Reserv for core and drivers use */
46 #define BT_SKB_RESERVE	8
47 
48 #define BTPROTO_L2CAP	0
49 #define BTPROTO_HCI	1
50 #define BTPROTO_SCO	2
51 #define BTPROTO_RFCOMM	3
52 #define BTPROTO_BNEP	4
53 #define BTPROTO_CMTP	5
54 #define BTPROTO_HIDP	6
55 #define BTPROTO_AVDTP	7
56 
57 #define SOL_HCI		0
58 #define SOL_L2CAP	6
59 #define SOL_SCO		17
60 #define SOL_RFCOMM	18
61 
62 #define BT_SECURITY	4
63 struct bt_security {
64 	__u8 level;
65 	__u8 key_size;
66 };
67 #define BT_SECURITY_SDP		0
68 #define BT_SECURITY_LOW		1
69 #define BT_SECURITY_MEDIUM	2
70 #define BT_SECURITY_HIGH	3
71 #define BT_SECURITY_FIPS	4
72 
73 #define BT_DEFER_SETUP	7
74 
75 #define BT_FLUSHABLE	8
76 
77 #define BT_FLUSHABLE_OFF	0
78 #define BT_FLUSHABLE_ON		1
79 
80 #define BT_POWER	9
81 struct bt_power {
82 	__u8 force_active;
83 };
84 #define BT_POWER_FORCE_ACTIVE_OFF 0
85 #define BT_POWER_FORCE_ACTIVE_ON  1
86 
87 #define BT_CHANNEL_POLICY	10
88 
89 /* BR/EDR only (default policy)
90  *   AMP controllers cannot be used.
91  *   Channel move requests from the remote device are denied.
92  *   If the L2CAP channel is currently using AMP, move the channel to BR/EDR.
93  */
94 #define BT_CHANNEL_POLICY_BREDR_ONLY		0
95 
96 /* BR/EDR Preferred
97  *   Allow use of AMP controllers.
98  *   If the L2CAP channel is currently on AMP, move it to BR/EDR.
99  *   Channel move requests from the remote device are allowed.
100  */
101 #define BT_CHANNEL_POLICY_BREDR_PREFERRED	1
102 
103 /* AMP Preferred
104  *   Allow use of AMP controllers
105  *   If the L2CAP channel is currently on BR/EDR and AMP controller
106  *     resources are available, initiate a channel move to AMP.
107  *   Channel move requests from the remote device are allowed.
108  *   If the L2CAP socket has not been connected yet, try to create
109  *     and configure the channel directly on an AMP controller rather
110  *     than BR/EDR.
111  */
112 #define BT_CHANNEL_POLICY_AMP_PREFERRED		2
113 
114 #define BT_VOICE		11
115 struct bt_voice {
116 	__u16 setting;
117 };
118 
119 #define BT_VOICE_TRANSPARENT			0x0003
120 #define BT_VOICE_CVSD_16BIT			0x0060
121 
122 #define BT_SNDMTU		12
123 #define BT_RCVMTU		13
124 
125 __printf(1, 2)
126 void bt_info(const char *fmt, ...);
127 __printf(1, 2)
128 void bt_warn(const char *fmt, ...);
129 __printf(1, 2)
130 void bt_err(const char *fmt, ...);
131 __printf(1, 2)
132 void bt_err_ratelimited(const char *fmt, ...);
133 
134 #define BT_INFO(fmt, ...)	bt_info(fmt "\n", ##__VA_ARGS__)
135 #define BT_WARN(fmt, ...)	bt_warn(fmt "\n", ##__VA_ARGS__)
136 #define BT_ERR(fmt, ...)	bt_err(fmt "\n", ##__VA_ARGS__)
137 #define BT_DBG(fmt, ...)	pr_debug(fmt "\n", ##__VA_ARGS__)
138 
139 #define BT_ERR_RATELIMITED(fmt, ...) bt_err_ratelimited(fmt "\n", ##__VA_ARGS__)
140 
141 #define bt_dev_info(hdev, fmt, ...)				\
142 	BT_INFO("%s: " fmt, (hdev)->name, ##__VA_ARGS__)
143 #define bt_dev_warn(hdev, fmt, ...)				\
144 	BT_WARN("%s: " fmt, (hdev)->name, ##__VA_ARGS__)
145 #define bt_dev_err(hdev, fmt, ...)				\
146 	BT_ERR("%s: " fmt, (hdev)->name, ##__VA_ARGS__)
147 #define bt_dev_dbg(hdev, fmt, ...)				\
148 	BT_DBG("%s: " fmt, (hdev)->name, ##__VA_ARGS__)
149 
150 #define bt_dev_err_ratelimited(hdev, fmt, ...)			\
151 	BT_ERR_RATELIMITED("%s: " fmt, (hdev)->name, ##__VA_ARGS__)
152 
153 /* Connection and socket states */
154 enum {
155 	BT_CONNECTED = 1, /* Equal to TCP_ESTABLISHED to make net code happy */
156 	BT_OPEN,
157 	BT_BOUND,
158 	BT_LISTEN,
159 	BT_CONNECT,
160 	BT_CONNECT2,
161 	BT_CONFIG,
162 	BT_DISCONN,
163 	BT_CLOSED
164 };
165 
166 /* If unused will be removed by compiler */
state_to_string(int state)167 static inline const char *state_to_string(int state)
168 {
169 	switch (state) {
170 	case BT_CONNECTED:
171 		return "BT_CONNECTED";
172 	case BT_OPEN:
173 		return "BT_OPEN";
174 	case BT_BOUND:
175 		return "BT_BOUND";
176 	case BT_LISTEN:
177 		return "BT_LISTEN";
178 	case BT_CONNECT:
179 		return "BT_CONNECT";
180 	case BT_CONNECT2:
181 		return "BT_CONNECT2";
182 	case BT_CONFIG:
183 		return "BT_CONFIG";
184 	case BT_DISCONN:
185 		return "BT_DISCONN";
186 	case BT_CLOSED:
187 		return "BT_CLOSED";
188 	}
189 
190 	return "invalid state";
191 }
192 
193 /* BD Address */
194 typedef struct {
195 	__u8 b[6];
196 } __packed bdaddr_t;
197 
198 /* BD Address type */
199 #define BDADDR_BREDR		0x00
200 #define BDADDR_LE_PUBLIC	0x01
201 #define BDADDR_LE_RANDOM	0x02
202 
bdaddr_type_is_valid(u8 type)203 static inline bool bdaddr_type_is_valid(u8 type)
204 {
205 	switch (type) {
206 	case BDADDR_BREDR:
207 	case BDADDR_LE_PUBLIC:
208 	case BDADDR_LE_RANDOM:
209 		return true;
210 	}
211 
212 	return false;
213 }
214 
bdaddr_type_is_le(u8 type)215 static inline bool bdaddr_type_is_le(u8 type)
216 {
217 	switch (type) {
218 	case BDADDR_LE_PUBLIC:
219 	case BDADDR_LE_RANDOM:
220 		return true;
221 	}
222 
223 	return false;
224 }
225 
226 #define BDADDR_ANY  (&(bdaddr_t) {{0, 0, 0, 0, 0, 0}})
227 #define BDADDR_NONE (&(bdaddr_t) {{0xff, 0xff, 0xff, 0xff, 0xff, 0xff}})
228 
229 /* Copy, swap, convert BD Address */
bacmp(const bdaddr_t * ba1,const bdaddr_t * ba2)230 static inline int bacmp(const bdaddr_t *ba1, const bdaddr_t *ba2)
231 {
232 	return memcmp(ba1, ba2, sizeof(bdaddr_t));
233 }
bacpy(bdaddr_t * dst,const bdaddr_t * src)234 static inline void bacpy(bdaddr_t *dst, const bdaddr_t *src)
235 {
236 	memcpy(dst, src, sizeof(bdaddr_t));
237 }
238 
239 void baswap(bdaddr_t *dst, const bdaddr_t *src);
240 
241 /* Common socket structures and functions */
242 
243 #define bt_sk(__sk) ((struct bt_sock *) __sk)
244 
245 struct bt_sock {
246 	struct sock sk;
247 	struct list_head accept_q;
248 	struct sock *parent;
249 	unsigned long flags;
250 	void (*skb_msg_name)(struct sk_buff *, void *, int *);
251 };
252 
253 enum {
254 	BT_SK_DEFER_SETUP,
255 	BT_SK_SUSPEND,
256 };
257 
258 struct bt_sock_list {
259 	struct hlist_head head;
260 	rwlock_t          lock;
261 #ifdef CONFIG_PROC_FS
262         int (* custom_seq_show)(struct seq_file *, void *);
263 #endif
264 };
265 
266 int  bt_sock_register(int proto, const struct net_proto_family *ops);
267 void bt_sock_unregister(int proto);
268 void bt_sock_link(struct bt_sock_list *l, struct sock *s);
269 void bt_sock_unlink(struct bt_sock_list *l, struct sock *s);
270 int  bt_sock_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
271 		     int flags);
272 int  bt_sock_stream_recvmsg(struct socket *sock, struct msghdr *msg,
273 			    size_t len, int flags);
274 __poll_t bt_sock_poll(struct file *file, struct socket *sock, poll_table *wait);
275 int  bt_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
276 int  bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo);
277 int  bt_sock_wait_ready(struct sock *sk, unsigned long flags);
278 
279 void bt_accept_enqueue(struct sock *parent, struct sock *sk, bool bh);
280 void bt_accept_unlink(struct sock *sk);
281 struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock);
282 
283 /* Skb helpers */
284 struct l2cap_ctrl {
285 	u8	sframe:1,
286 		poll:1,
287 		final:1,
288 		fcs:1,
289 		sar:2,
290 		super:2;
291 
292 	u16	reqseq;
293 	u16	txseq;
294 	u8	retries;
295 	__le16  psm;
296 	bdaddr_t bdaddr;
297 	struct l2cap_chan *chan;
298 };
299 
300 struct hci_dev;
301 
302 typedef void (*hci_req_complete_t)(struct hci_dev *hdev, u8 status, u16 opcode);
303 typedef void (*hci_req_complete_skb_t)(struct hci_dev *hdev, u8 status,
304 				       u16 opcode, struct sk_buff *skb);
305 
306 #define HCI_REQ_START	BIT(0)
307 #define HCI_REQ_SKB	BIT(1)
308 
309 struct hci_ctrl {
310 	u16 opcode;
311 	u8 req_flags;
312 	u8 req_event;
313 	union {
314 		hci_req_complete_t req_complete;
315 		hci_req_complete_skb_t req_complete_skb;
316 	};
317 };
318 
319 struct bt_skb_cb {
320 	u8 pkt_type;
321 	u8 force_active;
322 	u16 expect;
323 	u8 incoming:1;
324 	union {
325 		struct l2cap_ctrl l2cap;
326 		struct hci_ctrl hci;
327 	};
328 };
329 #define bt_cb(skb) ((struct bt_skb_cb *)((skb)->cb))
330 
331 #define hci_skb_pkt_type(skb) bt_cb((skb))->pkt_type
332 #define hci_skb_expect(skb) bt_cb((skb))->expect
333 #define hci_skb_opcode(skb) bt_cb((skb))->hci.opcode
334 
bt_skb_alloc(unsigned int len,gfp_t how)335 static inline struct sk_buff *bt_skb_alloc(unsigned int len, gfp_t how)
336 {
337 	struct sk_buff *skb;
338 
339 	skb = alloc_skb(len + BT_SKB_RESERVE, how);
340 	if (skb)
341 		skb_reserve(skb, BT_SKB_RESERVE);
342 	return skb;
343 }
344 
bt_skb_send_alloc(struct sock * sk,unsigned long len,int nb,int * err)345 static inline struct sk_buff *bt_skb_send_alloc(struct sock *sk,
346 					unsigned long len, int nb, int *err)
347 {
348 	struct sk_buff *skb;
349 
350 	skb = sock_alloc_send_skb(sk, len + BT_SKB_RESERVE, nb, err);
351 	if (skb)
352 		skb_reserve(skb, BT_SKB_RESERVE);
353 
354 	if (!skb && *err)
355 		return NULL;
356 
357 	*err = sock_error(sk);
358 	if (*err)
359 		goto out;
360 
361 	if (sk->sk_shutdown) {
362 		*err = -ECONNRESET;
363 		goto out;
364 	}
365 
366 	return skb;
367 
368 out:
369 	kfree_skb(skb);
370 	return NULL;
371 }
372 
373 /* Shall not be called with lock_sock held */
bt_skb_sendmsg(struct sock * sk,struct msghdr * msg,size_t len,size_t mtu,size_t headroom,size_t tailroom)374 static inline struct sk_buff *bt_skb_sendmsg(struct sock *sk,
375 					     struct msghdr *msg,
376 					     size_t len, size_t mtu,
377 					     size_t headroom, size_t tailroom)
378 {
379 	struct sk_buff *skb;
380 	size_t size = min_t(size_t, len, mtu);
381 	int err;
382 
383 	skb = bt_skb_send_alloc(sk, size + headroom + tailroom,
384 				msg->msg_flags & MSG_DONTWAIT, &err);
385 	if (!skb)
386 		return ERR_PTR(err);
387 
388 	skb_reserve(skb, headroom);
389 	skb_tailroom_reserve(skb, mtu, tailroom);
390 
391 	if (!copy_from_iter_full(skb_put(skb, size), size, &msg->msg_iter)) {
392 		kfree_skb(skb);
393 		return ERR_PTR(-EFAULT);
394 	}
395 
396 	skb->priority = sk->sk_priority;
397 
398 	return skb;
399 }
400 
401 /* Similar to bt_skb_sendmsg but can split the msg into multiple fragments
402  * accourding to the MTU.
403  */
bt_skb_sendmmsg(struct sock * sk,struct msghdr * msg,size_t len,size_t mtu,size_t headroom,size_t tailroom)404 static inline struct sk_buff *bt_skb_sendmmsg(struct sock *sk,
405 					      struct msghdr *msg,
406 					      size_t len, size_t mtu,
407 					      size_t headroom, size_t tailroom)
408 {
409 	struct sk_buff *skb, **frag;
410 
411 	skb = bt_skb_sendmsg(sk, msg, len, mtu, headroom, tailroom);
412 	if (IS_ERR_OR_NULL(skb))
413 		return skb;
414 
415 	len -= skb->len;
416 	if (!len)
417 		return skb;
418 
419 	/* Add remaining data over MTU as continuation fragments */
420 	frag = &skb_shinfo(skb)->frag_list;
421 	while (len) {
422 		struct sk_buff *tmp;
423 
424 		tmp = bt_skb_sendmsg(sk, msg, len, mtu, headroom, tailroom);
425 		if (IS_ERR(tmp)) {
426 			return skb;
427 		}
428 
429 		len -= tmp->len;
430 
431 		*frag = tmp;
432 		frag = &(*frag)->next;
433 	}
434 
435 	return skb;
436 }
437 
438 int bt_to_errno(u16 code);
439 
440 void hci_sock_set_flag(struct sock *sk, int nr);
441 void hci_sock_clear_flag(struct sock *sk, int nr);
442 int hci_sock_test_flag(struct sock *sk, int nr);
443 unsigned short hci_sock_get_channel(struct sock *sk);
444 u32 hci_sock_get_cookie(struct sock *sk);
445 
446 int hci_sock_init(void);
447 void hci_sock_cleanup(void);
448 
449 int bt_sysfs_init(void);
450 void bt_sysfs_cleanup(void);
451 
452 int bt_procfs_init(struct net *net, const char *name,
453 		   struct bt_sock_list *sk_list,
454 		   int (*seq_show)(struct seq_file *, void *));
455 void bt_procfs_cleanup(struct net *net, const char *name);
456 
457 extern struct dentry *bt_debugfs;
458 
459 int l2cap_init(void);
460 void l2cap_exit(void);
461 
462 #if IS_ENABLED(CONFIG_BT_BREDR)
463 int sco_init(void);
464 void sco_exit(void);
465 #else
sco_init(void)466 static inline int sco_init(void)
467 {
468 	return 0;
469 }
470 
sco_exit(void)471 static inline void sco_exit(void)
472 {
473 }
474 #endif
475 
476 int mgmt_init(void);
477 void mgmt_exit(void);
478 
479 void bt_sock_reclassify_lock(struct sock *sk, int proto);
480 
481 #endif /* __BLUETOOTH_H */
482