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 #ifndef __RFCOMM_H
25 #define __RFCOMM_H
26 
27 #define RFCOMM_PSM 3
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_L2CAP_MTU	1013
38 #define RFCOMM_MAX_CREDITS	40
39 
40 #define RFCOMM_SKB_HEAD_RESERVE	8
41 #define RFCOMM_SKB_TAIL_RESERVE	2
42 #define RFCOMM_SKB_RESERVE  (RFCOMM_SKB_HEAD_RESERVE + RFCOMM_SKB_TAIL_RESERVE)
43 
44 #define RFCOMM_SABM	0x2f
45 #define RFCOMM_DISC	0x43
46 #define RFCOMM_UA	0x63
47 #define RFCOMM_DM	0x0f
48 #define RFCOMM_UIH	0xef
49 
50 #define RFCOMM_TEST	0x08
51 #define RFCOMM_FCON	0x28
52 #define RFCOMM_FCOFF	0x18
53 #define RFCOMM_MSC	0x38
54 #define RFCOMM_RPN	0x24
55 #define RFCOMM_RLS	0x14
56 #define RFCOMM_PN	0x20
57 #define RFCOMM_NSC	0x04
58 
59 #define RFCOMM_V24_FC	0x02
60 #define RFCOMM_V24_RTC	0x04
61 #define RFCOMM_V24_RTR	0x08
62 #define RFCOMM_V24_IC	0x40
63 #define RFCOMM_V24_DV	0x80
64 
65 #define RFCOMM_RPN_BR_2400	0x0
66 #define RFCOMM_RPN_BR_4800	0x1
67 #define RFCOMM_RPN_BR_7200	0x2
68 #define RFCOMM_RPN_BR_9600	0x3
69 #define RFCOMM_RPN_BR_19200	0x4
70 #define RFCOMM_RPN_BR_38400	0x5
71 #define RFCOMM_RPN_BR_57600	0x6
72 #define RFCOMM_RPN_BR_115200	0x7
73 #define RFCOMM_RPN_BR_230400	0x8
74 
75 #define RFCOMM_RPN_DATA_5	0x0
76 #define RFCOMM_RPN_DATA_6	0x1
77 #define RFCOMM_RPN_DATA_7	0x2
78 #define RFCOMM_RPN_DATA_8	0x3
79 
80 #define RFCOMM_RPN_STOP_1	0
81 #define RFCOMM_RPN_STOP_15	1
82 
83 #define RFCOMM_RPN_PARITY_NONE	0x0
84 #define RFCOMM_RPN_PARITY_ODD	0x1
85 #define RFCOMM_RPN_PARITY_EVEN	0x3
86 #define RFCOMM_RPN_PARITY_MARK	0x5
87 #define RFCOMM_RPN_PARITY_SPACE	0x7
88 
89 #define RFCOMM_RPN_FLOW_NONE	0x00
90 
91 #define RFCOMM_RPN_XON_CHAR	0x11
92 #define RFCOMM_RPN_XOFF_CHAR	0x13
93 
94 #define RFCOMM_RPN_PM_BITRATE		0x0001
95 #define RFCOMM_RPN_PM_DATA		0x0002
96 #define RFCOMM_RPN_PM_STOP		0x0004
97 #define RFCOMM_RPN_PM_PARITY		0x0008
98 #define RFCOMM_RPN_PM_PARITY_TYPE	0x0010
99 #define RFCOMM_RPN_PM_XON		0x0020
100 #define RFCOMM_RPN_PM_XOFF		0x0040
101 #define RFCOMM_RPN_PM_FLOW		0x3F00
102 
103 #define RFCOMM_RPN_PM_ALL		0x3F7F
104 
105 struct rfcomm_hdr {
106 	u8 addr;
107 	u8 ctrl;
108 	u8 len;    /* Actual size can be 2 bytes */
109 } __packed;
110 
111 struct rfcomm_cmd {
112 	u8 addr;
113 	u8 ctrl;
114 	u8 len;
115 	u8 fcs;
116 } __packed;
117 
118 struct rfcomm_mcc {
119 	u8 type;
120 	u8 len;
121 } __packed;
122 
123 struct rfcomm_pn {
124 	u8  dlci;
125 	u8  flow_ctrl;
126 	u8  priority;
127 	u8  ack_timer;
128 	__le16 mtu;
129 	u8  max_retrans;
130 	u8  credits;
131 } __packed;
132 
133 struct rfcomm_rpn {
134 	u8  dlci;
135 	u8  bit_rate;
136 	u8  line_settings;
137 	u8  flow_ctrl;
138 	u8  xon_char;
139 	u8  xoff_char;
140 	__le16 param_mask;
141 } __packed;
142 
143 struct rfcomm_rls {
144 	u8  dlci;
145 	u8  status;
146 } __packed;
147 
148 struct rfcomm_msc {
149 	u8  dlci;
150 	u8  v24_sig;
151 } __packed;
152 
153 /* ---- Core structures, flags etc ---- */
154 
155 struct rfcomm_session {
156 	struct list_head list;
157 	struct socket   *sock;
158 	struct timer_list timer;
159 	unsigned long    state;
160 	unsigned long    flags;
161 	atomic_t         refcnt;
162 	int              initiator;
163 
164 	/* Default DLC parameters */
165 	int    cfc;
166 	uint   mtu;
167 
168 	struct list_head dlcs;
169 };
170 
171 struct rfcomm_dlc {
172 	struct list_head      list;
173 	struct rfcomm_session *session;
174 	struct sk_buff_head   tx_queue;
175 	struct timer_list     timer;
176 
177 	spinlock_t    lock;
178 	unsigned long state;
179 	unsigned long flags;
180 	atomic_t      refcnt;
181 	u8            dlci;
182 	u8            addr;
183 	u8            priority;
184 	u8            v24_sig;
185 	u8            remote_v24_sig;
186 	u8            mscex;
187 	u8            out;
188 	u8            sec_level;
189 	u8            role_switch;
190 	u32           defer_setup;
191 
192 	uint          mtu;
193 	uint          cfc;
194 	uint          rx_credits;
195 	uint          tx_credits;
196 
197 	void          *owner;
198 
199 	void (*data_ready)(struct rfcomm_dlc *d, struct sk_buff *skb);
200 	void (*state_change)(struct rfcomm_dlc *d, int err);
201 	void (*modem_status)(struct rfcomm_dlc *d, u8 v24_sig);
202 };
203 
204 /* DLC and session flags */
205 #define RFCOMM_RX_THROTTLED 0
206 #define RFCOMM_TX_THROTTLED 1
207 #define RFCOMM_TIMED_OUT    2
208 #define RFCOMM_MSC_PENDING  3
209 #define RFCOMM_SEC_PENDING  4
210 #define RFCOMM_AUTH_PENDING 5
211 #define RFCOMM_AUTH_ACCEPT  6
212 #define RFCOMM_AUTH_REJECT  7
213 #define RFCOMM_DEFER_SETUP  8
214 #define RFCOMM_ENC_DROP     9
215 
216 /* Scheduling flags and events */
217 #define RFCOMM_SCHED_WAKEUP 31
218 
219 /* MSC exchange flags */
220 #define RFCOMM_MSCEX_TX     1
221 #define RFCOMM_MSCEX_RX     2
222 #define RFCOMM_MSCEX_OK     (RFCOMM_MSCEX_TX + RFCOMM_MSCEX_RX)
223 
224 /* CFC states */
225 #define RFCOMM_CFC_UNKNOWN  -1
226 #define RFCOMM_CFC_DISABLED 0
227 #define RFCOMM_CFC_ENABLED  RFCOMM_MAX_CREDITS
228 
229 /* ---- RFCOMM SEND RPN ---- */
230 int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci,
231 			u8 bit_rate, u8 data_bits, u8 stop_bits,
232 			u8 parity, u8 flow_ctrl_settings,
233 			u8 xon_char, u8 xoff_char, u16 param_mask);
234 
235 /* ---- RFCOMM DLCs (channels) ---- */
236 struct rfcomm_dlc *rfcomm_dlc_alloc(gfp_t prio);
237 void rfcomm_dlc_free(struct rfcomm_dlc *d);
238 int  rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst,
239 								u8 channel);
240 int  rfcomm_dlc_close(struct rfcomm_dlc *d, int reason);
241 int  rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb);
242 int  rfcomm_dlc_set_modem_status(struct rfcomm_dlc *d, u8 v24_sig);
243 int  rfcomm_dlc_get_modem_status(struct rfcomm_dlc *d, u8 *v24_sig);
244 void rfcomm_dlc_accept(struct rfcomm_dlc *d);
245 
246 #define rfcomm_dlc_lock(d)     spin_lock(&d->lock)
247 #define rfcomm_dlc_unlock(d)   spin_unlock(&d->lock)
248 
rfcomm_dlc_hold(struct rfcomm_dlc * d)249 static inline void rfcomm_dlc_hold(struct rfcomm_dlc *d)
250 {
251 	atomic_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 (atomic_dec_and_test(&d->refcnt))
257 		rfcomm_dlc_free(d);
258 }
259 
260 extern void __rfcomm_dlc_throttle(struct rfcomm_dlc *d);
261 extern 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 
rfcomm_session_hold(struct rfcomm_session * s)279 static inline void rfcomm_session_hold(struct rfcomm_session *s)
280 {
281 	atomic_inc(&s->refcnt);
282 }
283 
284 /* ---- RFCOMM sockets ---- */
285 struct sockaddr_rc {
286 	sa_family_t	rc_family;
287 	bdaddr_t	rc_bdaddr;
288 	u8		rc_channel;
289 };
290 
291 #define RFCOMM_CONNINFO	0x02
292 struct rfcomm_conninfo {
293 	__u16 hci_handle;
294 	__u8  dev_class[3];
295 };
296 
297 #define RFCOMM_LM	0x03
298 #define RFCOMM_LM_MASTER	0x0001
299 #define RFCOMM_LM_AUTH		0x0002
300 #define RFCOMM_LM_ENCRYPT	0x0004
301 #define RFCOMM_LM_TRUSTED	0x0008
302 #define RFCOMM_LM_RELIABLE	0x0010
303 #define RFCOMM_LM_SECURE	0x0020
304 
305 #define rfcomm_pi(sk) ((struct rfcomm_pinfo *) sk)
306 
307 struct rfcomm_pinfo {
308 	struct bt_sock bt;
309 	struct rfcomm_dlc   *dlc;
310 	u8     channel;
311 	u8     sec_level;
312 	u8     role_switch;
313 };
314 
315 int  rfcomm_init_sockets(void);
316 void rfcomm_cleanup_sockets(void);
317 
318 int  rfcomm_connect_ind(struct rfcomm_session *s, u8 channel,
319 							struct rfcomm_dlc **d);
320 
321 /* ---- RFCOMM TTY ---- */
322 #define RFCOMM_MAX_DEV  256
323 
324 #define RFCOMMCREATEDEV		_IOW('R', 200, int)
325 #define RFCOMMRELEASEDEV	_IOW('R', 201, int)
326 #define RFCOMMGETDEVLIST	_IOR('R', 210, int)
327 #define RFCOMMGETDEVINFO	_IOR('R', 211, int)
328 #define RFCOMMSTEALDLC		_IOW('R', 220, int)
329 
330 #define RFCOMM_REUSE_DLC      0
331 #define RFCOMM_RELEASE_ONHUP  1
332 #define RFCOMM_HANGUP_NOW     2
333 #define RFCOMM_TTY_ATTACHED   3
334 #define RFCOMM_TTY_RELEASED   4
335 
336 struct rfcomm_dev_req {
337 	s16      dev_id;
338 	u32      flags;
339 	bdaddr_t src;
340 	bdaddr_t dst;
341 	u8       channel;
342 };
343 
344 struct rfcomm_dev_info {
345 	s16      id;
346 	u32      flags;
347 	u16      state;
348 	bdaddr_t src;
349 	bdaddr_t dst;
350 	u8       channel;
351 };
352 
353 struct rfcomm_dev_list_req {
354 	u16      dev_num;
355 	struct   rfcomm_dev_info dev_info[0];
356 };
357 
358 int  rfcomm_dev_ioctl(struct sock *sk, unsigned int cmd, void __user *arg);
359 
360 #ifdef CONFIG_BT_RFCOMM_TTY
361 int  rfcomm_init_ttys(void);
362 void rfcomm_cleanup_ttys(void);
363 #else
rfcomm_init_ttys(void)364 static inline int rfcomm_init_ttys(void)
365 {
366 	return 0;
367 }
rfcomm_cleanup_ttys(void)368 static inline void rfcomm_cleanup_ttys(void)
369 {
370 }
371 #endif
372 #endif /* __RFCOMM_H */
373