1 /*
2    RFCOMM implementation for Linux Bluetooth stack (BlueZ)
3    Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>
4    Copyright (C) 2002 Marcel Holtmann <marcel@holtmann.org>
5 
6    This program is free software; you can redistribute it and/or modify
7    it under the terms of the GNU General Public License version 2 as
8    published by the Free Software Foundation;
9 
10    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
11    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
12    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
13    IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
14    CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
15    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 
19    ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
20    COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
21    SOFTWARE IS DISCLAIMED.
22 */
23 
24 #include <linux/refcount.h>
25 
26 #ifndef __RFCOMM_H
27 #define __RFCOMM_H
28 
29 #define RFCOMM_CONN_TIMEOUT (HZ * 30)
30 #define RFCOMM_DISC_TIMEOUT (HZ * 20)
31 #define RFCOMM_AUTH_TIMEOUT (HZ * 25)
32 #define RFCOMM_IDLE_TIMEOUT (HZ * 2)
33 
34 #define RFCOMM_DEFAULT_MTU	127
35 #define RFCOMM_DEFAULT_CREDITS	7
36 
37 #define RFCOMM_MAX_CREDITS	40
38 
39 #define RFCOMM_SKB_HEAD_RESERVE	8
40 #define RFCOMM_SKB_TAIL_RESERVE	2
41 #define RFCOMM_SKB_RESERVE  (RFCOMM_SKB_HEAD_RESERVE + RFCOMM_SKB_TAIL_RESERVE)
42 
43 #define RFCOMM_SABM	0x2f
44 #define RFCOMM_DISC	0x43
45 #define RFCOMM_UA	0x63
46 #define RFCOMM_DM	0x0f
47 #define RFCOMM_UIH	0xef
48 
49 #define RFCOMM_TEST	0x08
50 #define RFCOMM_FCON	0x28
51 #define RFCOMM_FCOFF	0x18
52 #define RFCOMM_MSC	0x38
53 #define RFCOMM_RPN	0x24
54 #define RFCOMM_RLS	0x14
55 #define RFCOMM_PN	0x20
56 #define RFCOMM_NSC	0x04
57 
58 #define RFCOMM_V24_FC	0x02
59 #define RFCOMM_V24_RTC	0x04
60 #define RFCOMM_V24_RTR	0x08
61 #define RFCOMM_V24_IC	0x40
62 #define RFCOMM_V24_DV	0x80
63 
64 #define RFCOMM_RPN_BR_2400	0x0
65 #define RFCOMM_RPN_BR_4800	0x1
66 #define RFCOMM_RPN_BR_7200	0x2
67 #define RFCOMM_RPN_BR_9600	0x3
68 #define RFCOMM_RPN_BR_19200	0x4
69 #define RFCOMM_RPN_BR_38400	0x5
70 #define RFCOMM_RPN_BR_57600	0x6
71 #define RFCOMM_RPN_BR_115200	0x7
72 #define RFCOMM_RPN_BR_230400	0x8
73 
74 #define RFCOMM_RPN_DATA_5	0x0
75 #define RFCOMM_RPN_DATA_6	0x1
76 #define RFCOMM_RPN_DATA_7	0x2
77 #define RFCOMM_RPN_DATA_8	0x3
78 
79 #define RFCOMM_RPN_STOP_1	0
80 #define RFCOMM_RPN_STOP_15	1
81 
82 #define RFCOMM_RPN_PARITY_NONE	0x0
83 #define RFCOMM_RPN_PARITY_ODD	0x1
84 #define RFCOMM_RPN_PARITY_EVEN	0x3
85 #define RFCOMM_RPN_PARITY_MARK	0x5
86 #define RFCOMM_RPN_PARITY_SPACE	0x7
87 
88 #define RFCOMM_RPN_FLOW_NONE	0x00
89 
90 #define RFCOMM_RPN_XON_CHAR	0x11
91 #define RFCOMM_RPN_XOFF_CHAR	0x13
92 
93 #define RFCOMM_RPN_PM_BITRATE		0x0001
94 #define RFCOMM_RPN_PM_DATA		0x0002
95 #define RFCOMM_RPN_PM_STOP		0x0004
96 #define RFCOMM_RPN_PM_PARITY		0x0008
97 #define RFCOMM_RPN_PM_PARITY_TYPE	0x0010
98 #define RFCOMM_RPN_PM_XON		0x0020
99 #define RFCOMM_RPN_PM_XOFF		0x0040
100 #define RFCOMM_RPN_PM_FLOW		0x3F00
101 
102 #define RFCOMM_RPN_PM_ALL		0x3F7F
103 
104 struct rfcomm_hdr {
105 	u8 addr;
106 	u8 ctrl;
107 	u8 len;    /* Actual size can be 2 bytes */
108 } __packed;
109 
110 struct rfcomm_cmd {
111 	u8 addr;
112 	u8 ctrl;
113 	u8 len;
114 	u8 fcs;
115 } __packed;
116 
117 struct rfcomm_mcc {
118 	u8 type;
119 	u8 len;
120 } __packed;
121 
122 struct rfcomm_pn {
123 	u8  dlci;
124 	u8  flow_ctrl;
125 	u8  priority;
126 	u8  ack_timer;
127 	__le16 mtu;
128 	u8  max_retrans;
129 	u8  credits;
130 } __packed;
131 
132 struct rfcomm_rpn {
133 	u8  dlci;
134 	u8  bit_rate;
135 	u8  line_settings;
136 	u8  flow_ctrl;
137 	u8  xon_char;
138 	u8  xoff_char;
139 	__le16 param_mask;
140 } __packed;
141 
142 struct rfcomm_rls {
143 	u8  dlci;
144 	u8  status;
145 } __packed;
146 
147 struct rfcomm_msc {
148 	u8  dlci;
149 	u8  v24_sig;
150 } __packed;
151 
152 /* ---- Core structures, flags etc ---- */
153 
154 struct rfcomm_session {
155 	struct list_head list;
156 	struct socket   *sock;
157 	struct timer_list timer;
158 	unsigned long    state;
159 	unsigned long    flags;
160 	int              initiator;
161 
162 	/* Default DLC parameters */
163 	int    cfc;
164 	uint   mtu;
165 
166 	struct list_head dlcs;
167 };
168 
169 struct rfcomm_dlc {
170 	struct list_head      list;
171 	struct rfcomm_session *session;
172 	struct sk_buff_head   tx_queue;
173 	struct timer_list     timer;
174 
175 	struct mutex  lock;
176 	unsigned long state;
177 	unsigned long flags;
178 	refcount_t    refcnt;
179 	u8            dlci;
180 	u8            addr;
181 	u8            priority;
182 	u8            v24_sig;
183 	u8            remote_v24_sig;
184 	u8            mscex;
185 	u8            out;
186 	u8            sec_level;
187 	u8            role_switch;
188 	u32           defer_setup;
189 
190 	uint          mtu;
191 	uint          cfc;
192 	uint          rx_credits;
193 	uint          tx_credits;
194 
195 	void          *owner;
196 
197 	void (*data_ready)(struct rfcomm_dlc *d, struct sk_buff *skb);
198 	void (*state_change)(struct rfcomm_dlc *d, int err);
199 	void (*modem_status)(struct rfcomm_dlc *d, u8 v24_sig);
200 };
201 
202 /* DLC and session flags */
203 #define RFCOMM_RX_THROTTLED 0
204 #define RFCOMM_TX_THROTTLED 1
205 #define RFCOMM_TIMED_OUT    2
206 #define RFCOMM_MSC_PENDING  3
207 #define RFCOMM_SEC_PENDING  4
208 #define RFCOMM_AUTH_PENDING 5
209 #define RFCOMM_AUTH_ACCEPT  6
210 #define RFCOMM_AUTH_REJECT  7
211 #define RFCOMM_DEFER_SETUP  8
212 #define RFCOMM_ENC_DROP     9
213 
214 /* Scheduling flags and events */
215 #define RFCOMM_SCHED_WAKEUP 31
216 
217 /* MSC exchange flags */
218 #define RFCOMM_MSCEX_TX     1
219 #define RFCOMM_MSCEX_RX     2
220 #define RFCOMM_MSCEX_OK     (RFCOMM_MSCEX_TX + RFCOMM_MSCEX_RX)
221 
222 /* CFC states */
223 #define RFCOMM_CFC_UNKNOWN  -1
224 #define RFCOMM_CFC_DISABLED 0
225 #define RFCOMM_CFC_ENABLED  RFCOMM_MAX_CREDITS
226 
227 /* ---- RFCOMM SEND RPN ---- */
228 int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci,
229 			u8 bit_rate, u8 data_bits, u8 stop_bits,
230 			u8 parity, u8 flow_ctrl_settings,
231 			u8 xon_char, u8 xoff_char, u16 param_mask);
232 
233 /* ---- RFCOMM DLCs (channels) ---- */
234 struct rfcomm_dlc *rfcomm_dlc_alloc(gfp_t prio);
235 void rfcomm_dlc_free(struct rfcomm_dlc *d);
236 int  rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst,
237 								u8 channel);
238 int  rfcomm_dlc_close(struct rfcomm_dlc *d, int reason);
239 int  rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb);
240 void rfcomm_dlc_send_noerror(struct rfcomm_dlc *d, struct sk_buff *skb);
241 int  rfcomm_dlc_set_modem_status(struct rfcomm_dlc *d, u8 v24_sig);
242 int  rfcomm_dlc_get_modem_status(struct rfcomm_dlc *d, u8 *v24_sig);
243 void rfcomm_dlc_accept(struct rfcomm_dlc *d);
244 struct rfcomm_dlc *rfcomm_dlc_exists(bdaddr_t *src, bdaddr_t *dst, u8 channel);
245 
246 #define rfcomm_dlc_lock(d)     mutex_lock(&d->lock)
247 #define rfcomm_dlc_unlock(d)   mutex_unlock(&d->lock)
248 
rfcomm_dlc_hold(struct rfcomm_dlc * d)249 static inline void rfcomm_dlc_hold(struct rfcomm_dlc *d)
250 {
251 	refcount_inc(&d->refcnt);
252 }
253 
rfcomm_dlc_put(struct rfcomm_dlc * d)254 static inline void rfcomm_dlc_put(struct rfcomm_dlc *d)
255 {
256 	if (refcount_dec_and_test(&d->refcnt))
257 		rfcomm_dlc_free(d);
258 }
259 
260 void __rfcomm_dlc_throttle(struct rfcomm_dlc *d);
261 void __rfcomm_dlc_unthrottle(struct rfcomm_dlc *d);
262 
rfcomm_dlc_throttle(struct rfcomm_dlc * d)263 static inline void rfcomm_dlc_throttle(struct rfcomm_dlc *d)
264 {
265 	if (!test_and_set_bit(RFCOMM_RX_THROTTLED, &d->flags))
266 		__rfcomm_dlc_throttle(d);
267 }
268 
rfcomm_dlc_unthrottle(struct rfcomm_dlc * d)269 static inline void rfcomm_dlc_unthrottle(struct rfcomm_dlc *d)
270 {
271 	if (test_and_clear_bit(RFCOMM_RX_THROTTLED, &d->flags))
272 		__rfcomm_dlc_unthrottle(d);
273 }
274 
275 /* ---- RFCOMM sessions ---- */
276 void   rfcomm_session_getaddr(struct rfcomm_session *s, bdaddr_t *src,
277 								bdaddr_t *dst);
278 
279 /* ---- RFCOMM sockets ---- */
280 struct sockaddr_rc {
281 	sa_family_t	rc_family;
282 	bdaddr_t	rc_bdaddr;
283 	u8		rc_channel;
284 };
285 
286 #define RFCOMM_CONNINFO	0x02
287 struct rfcomm_conninfo {
288 	__u16 hci_handle;
289 	__u8  dev_class[3];
290 };
291 
292 #define RFCOMM_LM	0x03
293 #define RFCOMM_LM_MASTER	0x0001
294 #define RFCOMM_LM_AUTH		0x0002
295 #define RFCOMM_LM_ENCRYPT	0x0004
296 #define RFCOMM_LM_TRUSTED	0x0008
297 #define RFCOMM_LM_RELIABLE	0x0010
298 #define RFCOMM_LM_SECURE	0x0020
299 #define RFCOMM_LM_FIPS		0x0040
300 
301 #define rfcomm_pi(sk) ((struct rfcomm_pinfo *) sk)
302 
303 struct rfcomm_pinfo {
304 	struct bt_sock bt;
305 	bdaddr_t src;
306 	bdaddr_t dst;
307 	struct rfcomm_dlc   *dlc;
308 	u8     channel;
309 	u8     sec_level;
310 	u8     role_switch;
311 };
312 
313 int  rfcomm_init_sockets(void);
314 void rfcomm_cleanup_sockets(void);
315 
316 int  rfcomm_connect_ind(struct rfcomm_session *s, u8 channel,
317 							struct rfcomm_dlc **d);
318 
319 /* ---- RFCOMM TTY ---- */
320 #define RFCOMM_MAX_DEV  256
321 
322 #define RFCOMMCREATEDEV		_IOW('R', 200, int)
323 #define RFCOMMRELEASEDEV	_IOW('R', 201, int)
324 #define RFCOMMGETDEVLIST	_IOR('R', 210, int)
325 #define RFCOMMGETDEVINFO	_IOR('R', 211, int)
326 #define RFCOMMSTEALDLC		_IOW('R', 220, int)
327 
328 /* rfcomm_dev.flags bit definitions */
329 #define RFCOMM_REUSE_DLC      0
330 #define RFCOMM_RELEASE_ONHUP  1
331 #define RFCOMM_HANGUP_NOW     2
332 #define RFCOMM_TTY_ATTACHED   3
333 #define RFCOMM_DEFUNCT_BIT4   4	  /* don't reuse this bit - userspace visible */
334 
335 /* rfcomm_dev.status bit definitions */
336 #define RFCOMM_DEV_RELEASED   0
337 #define RFCOMM_TTY_OWNED      1
338 
339 struct rfcomm_dev_req {
340 	s16      dev_id;
341 	u32      flags;
342 	bdaddr_t src;
343 	bdaddr_t dst;
344 	u8       channel;
345 };
346 
347 struct rfcomm_dev_info {
348 	s16      id;
349 	u32      flags;
350 	u16      state;
351 	bdaddr_t src;
352 	bdaddr_t dst;
353 	u8       channel;
354 };
355 
356 struct rfcomm_dev_list_req {
357 	u16      dev_num;
358 	struct   rfcomm_dev_info dev_info[];
359 };
360 
361 int  rfcomm_dev_ioctl(struct sock *sk, unsigned int cmd, void __user *arg);
362 
363 #ifdef CONFIG_BT_RFCOMM_TTY
364 int  rfcomm_init_ttys(void);
365 void rfcomm_cleanup_ttys(void);
366 #else
rfcomm_init_ttys(void)367 static inline int rfcomm_init_ttys(void)
368 {
369 	return 0;
370 }
rfcomm_cleanup_ttys(void)371 static inline void rfcomm_cleanup_ttys(void)
372 {
373 }
374 #endif
375 #endif /* __RFCOMM_H */
376