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1da177e4 LT |
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 | ||
1da177e4 LT |
24 | /* |
25 | * Bluetooth RFCOMM core. | |
26 | * | |
27 | * $Id: core.c,v 1.42 2002/10/01 23:26:25 maxk Exp $ | |
28 | */ | |
29 | ||
30 | #include <linux/config.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/errno.h> | |
33 | #include <linux/kernel.h> | |
34 | #include <linux/sched.h> | |
35 | #include <linux/signal.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/wait.h> | |
be9d1227 | 38 | #include <linux/device.h> |
1da177e4 | 39 | #include <linux/net.h> |
4a3e2f71 AV |
40 | #include <linux/mutex.h> |
41 | ||
1da177e4 LT |
42 | #include <net/sock.h> |
43 | #include <asm/uaccess.h> | |
44 | #include <asm/unaligned.h> | |
45 | ||
46 | #include <net/bluetooth/bluetooth.h> | |
47 | #include <net/bluetooth/hci_core.h> | |
48 | #include <net/bluetooth/l2cap.h> | |
49 | #include <net/bluetooth/rfcomm.h> | |
50 | ||
1da177e4 LT |
51 | #ifndef CONFIG_BT_RFCOMM_DEBUG |
52 | #undef BT_DBG | |
53 | #define BT_DBG(D...) | |
54 | #endif | |
55 | ||
56f3a40a MH |
56 | #define VERSION "1.7" |
57 | ||
58 | static unsigned int l2cap_mtu = RFCOMM_MAX_L2CAP_MTU; | |
59 | ||
1da177e4 LT |
60 | static struct task_struct *rfcomm_thread; |
61 | ||
4a3e2f71 AV |
62 | static DEFINE_MUTEX(rfcomm_mutex); |
63 | #define rfcomm_lock() mutex_lock(&rfcomm_mutex) | |
64 | #define rfcomm_unlock() mutex_unlock(&rfcomm_mutex) | |
1da177e4 LT |
65 | |
66 | static unsigned long rfcomm_event; | |
67 | ||
68 | static LIST_HEAD(session_list); | |
69 | static atomic_t terminate, running; | |
70 | ||
71 | static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len); | |
72 | static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci); | |
73 | static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci); | |
74 | static int rfcomm_queue_disc(struct rfcomm_dlc *d); | |
75 | static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type); | |
76 | static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d); | |
77 | static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig); | |
78 | static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len); | |
79 | static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits); | |
80 | static void rfcomm_make_uih(struct sk_buff *skb, u8 addr); | |
81 | ||
82 | static void rfcomm_process_connect(struct rfcomm_session *s); | |
83 | ||
84 | static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src, bdaddr_t *dst, int *err); | |
85 | static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst); | |
86 | static void rfcomm_session_del(struct rfcomm_session *s); | |
87 | ||
88 | /* ---- RFCOMM frame parsing macros ---- */ | |
89 | #define __get_dlci(b) ((b & 0xfc) >> 2) | |
90 | #define __get_channel(b) ((b & 0xf8) >> 3) | |
91 | #define __get_dir(b) ((b & 0x04) >> 2) | |
92 | #define __get_type(b) ((b & 0xef)) | |
93 | ||
94 | #define __test_ea(b) ((b & 0x01)) | |
95 | #define __test_cr(b) ((b & 0x02)) | |
96 | #define __test_pf(b) ((b & 0x10)) | |
97 | ||
98 | #define __addr(cr, dlci) (((dlci & 0x3f) << 2) | (cr << 1) | 0x01) | |
99 | #define __ctrl(type, pf) (((type & 0xef) | (pf << 4))) | |
100 | #define __dlci(dir, chn) (((chn & 0x1f) << 1) | dir) | |
101 | #define __srv_channel(dlci) (dlci >> 1) | |
102 | #define __dir(dlci) (dlci & 0x01) | |
103 | ||
104 | #define __len8(len) (((len) << 1) | 1) | |
105 | #define __len16(len) ((len) << 1) | |
106 | ||
107 | /* MCC macros */ | |
108 | #define __mcc_type(cr, type) (((type << 2) | (cr << 1) | 0x01)) | |
109 | #define __get_mcc_type(b) ((b & 0xfc) >> 2) | |
110 | #define __get_mcc_len(b) ((b & 0xfe) >> 1) | |
111 | ||
112 | /* RPN macros */ | |
3a5e903c | 113 | #define __rpn_line_settings(data, stop, parity) ((data & 0x3) | ((stop & 0x1) << 2) | ((parity & 0x7) << 3)) |
1da177e4 LT |
114 | #define __get_rpn_data_bits(line) ((line) & 0x3) |
115 | #define __get_rpn_stop_bits(line) (((line) >> 2) & 0x1) | |
3a5e903c | 116 | #define __get_rpn_parity(line) (((line) >> 3) & 0x7) |
1da177e4 LT |
117 | |
118 | static inline void rfcomm_schedule(uint event) | |
119 | { | |
120 | if (!rfcomm_thread) | |
121 | return; | |
122 | //set_bit(event, &rfcomm_event); | |
123 | set_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event); | |
124 | wake_up_process(rfcomm_thread); | |
125 | } | |
126 | ||
127 | static inline void rfcomm_session_put(struct rfcomm_session *s) | |
128 | { | |
129 | if (atomic_dec_and_test(&s->refcnt)) | |
130 | rfcomm_session_del(s); | |
131 | } | |
132 | ||
133 | /* ---- RFCOMM FCS computation ---- */ | |
134 | ||
408c1ce2 MH |
135 | /* reversed, 8-bit, poly=0x07 */ |
136 | static unsigned char rfcomm_crc_table[256] = { | |
137 | 0x00, 0x91, 0xe3, 0x72, 0x07, 0x96, 0xe4, 0x75, | |
138 | 0x0e, 0x9f, 0xed, 0x7c, 0x09, 0x98, 0xea, 0x7b, | |
139 | 0x1c, 0x8d, 0xff, 0x6e, 0x1b, 0x8a, 0xf8, 0x69, | |
140 | 0x12, 0x83, 0xf1, 0x60, 0x15, 0x84, 0xf6, 0x67, | |
141 | ||
142 | 0x38, 0xa9, 0xdb, 0x4a, 0x3f, 0xae, 0xdc, 0x4d, | |
143 | 0x36, 0xa7, 0xd5, 0x44, 0x31, 0xa0, 0xd2, 0x43, | |
144 | 0x24, 0xb5, 0xc7, 0x56, 0x23, 0xb2, 0xc0, 0x51, | |
145 | 0x2a, 0xbb, 0xc9, 0x58, 0x2d, 0xbc, 0xce, 0x5f, | |
146 | ||
147 | 0x70, 0xe1, 0x93, 0x02, 0x77, 0xe6, 0x94, 0x05, | |
148 | 0x7e, 0xef, 0x9d, 0x0c, 0x79, 0xe8, 0x9a, 0x0b, | |
149 | 0x6c, 0xfd, 0x8f, 0x1e, 0x6b, 0xfa, 0x88, 0x19, | |
150 | 0x62, 0xf3, 0x81, 0x10, 0x65, 0xf4, 0x86, 0x17, | |
151 | ||
152 | 0x48, 0xd9, 0xab, 0x3a, 0x4f, 0xde, 0xac, 0x3d, | |
153 | 0x46, 0xd7, 0xa5, 0x34, 0x41, 0xd0, 0xa2, 0x33, | |
154 | 0x54, 0xc5, 0xb7, 0x26, 0x53, 0xc2, 0xb0, 0x21, | |
155 | 0x5a, 0xcb, 0xb9, 0x28, 0x5d, 0xcc, 0xbe, 0x2f, | |
156 | ||
157 | 0xe0, 0x71, 0x03, 0x92, 0xe7, 0x76, 0x04, 0x95, | |
158 | 0xee, 0x7f, 0x0d, 0x9c, 0xe9, 0x78, 0x0a, 0x9b, | |
159 | 0xfc, 0x6d, 0x1f, 0x8e, 0xfb, 0x6a, 0x18, 0x89, | |
160 | 0xf2, 0x63, 0x11, 0x80, 0xf5, 0x64, 0x16, 0x87, | |
161 | ||
162 | 0xd8, 0x49, 0x3b, 0xaa, 0xdf, 0x4e, 0x3c, 0xad, | |
163 | 0xd6, 0x47, 0x35, 0xa4, 0xd1, 0x40, 0x32, 0xa3, | |
164 | 0xc4, 0x55, 0x27, 0xb6, 0xc3, 0x52, 0x20, 0xb1, | |
165 | 0xca, 0x5b, 0x29, 0xb8, 0xcd, 0x5c, 0x2e, 0xbf, | |
166 | ||
167 | 0x90, 0x01, 0x73, 0xe2, 0x97, 0x06, 0x74, 0xe5, | |
168 | 0x9e, 0x0f, 0x7d, 0xec, 0x99, 0x08, 0x7a, 0xeb, | |
169 | 0x8c, 0x1d, 0x6f, 0xfe, 0x8b, 0x1a, 0x68, 0xf9, | |
170 | 0x82, 0x13, 0x61, 0xf0, 0x85, 0x14, 0x66, 0xf7, | |
171 | ||
172 | 0xa8, 0x39, 0x4b, 0xda, 0xaf, 0x3e, 0x4c, 0xdd, | |
173 | 0xa6, 0x37, 0x45, 0xd4, 0xa1, 0x30, 0x42, 0xd3, | |
174 | 0xb4, 0x25, 0x57, 0xc6, 0xb3, 0x22, 0x50, 0xc1, | |
175 | 0xba, 0x2b, 0x59, 0xc8, 0xbd, 0x2c, 0x5e, 0xcf | |
176 | }; | |
177 | ||
1da177e4 LT |
178 | /* CRC on 2 bytes */ |
179 | #define __crc(data) (rfcomm_crc_table[rfcomm_crc_table[0xff ^ data[0]] ^ data[1]]) | |
180 | ||
181 | /* FCS on 2 bytes */ | |
182 | static inline u8 __fcs(u8 *data) | |
183 | { | |
184 | return (0xff - __crc(data)); | |
185 | } | |
186 | ||
187 | /* FCS on 3 bytes */ | |
188 | static inline u8 __fcs2(u8 *data) | |
189 | { | |
190 | return (0xff - rfcomm_crc_table[__crc(data) ^ data[2]]); | |
191 | } | |
192 | ||
193 | /* Check FCS */ | |
194 | static inline int __check_fcs(u8 *data, int type, u8 fcs) | |
195 | { | |
196 | u8 f = __crc(data); | |
197 | ||
198 | if (type != RFCOMM_UIH) | |
199 | f = rfcomm_crc_table[f ^ data[2]]; | |
200 | ||
201 | return rfcomm_crc_table[f ^ fcs] != 0xcf; | |
202 | } | |
203 | ||
204 | /* ---- L2CAP callbacks ---- */ | |
205 | static void rfcomm_l2state_change(struct sock *sk) | |
206 | { | |
207 | BT_DBG("%p state %d", sk, sk->sk_state); | |
208 | rfcomm_schedule(RFCOMM_SCHED_STATE); | |
209 | } | |
210 | ||
211 | static void rfcomm_l2data_ready(struct sock *sk, int bytes) | |
212 | { | |
213 | BT_DBG("%p bytes %d", sk, bytes); | |
214 | rfcomm_schedule(RFCOMM_SCHED_RX); | |
215 | } | |
216 | ||
217 | static int rfcomm_l2sock_create(struct socket **sock) | |
218 | { | |
219 | int err; | |
220 | ||
221 | BT_DBG(""); | |
222 | ||
223 | err = sock_create_kern(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP, sock); | |
224 | if (!err) { | |
225 | struct sock *sk = (*sock)->sk; | |
226 | sk->sk_data_ready = rfcomm_l2data_ready; | |
227 | sk->sk_state_change = rfcomm_l2state_change; | |
228 | } | |
229 | return err; | |
230 | } | |
231 | ||
232 | /* ---- RFCOMM DLCs ---- */ | |
233 | static void rfcomm_dlc_timeout(unsigned long arg) | |
234 | { | |
235 | struct rfcomm_dlc *d = (void *) arg; | |
236 | ||
237 | BT_DBG("dlc %p state %ld", d, d->state); | |
238 | ||
239 | set_bit(RFCOMM_TIMED_OUT, &d->flags); | |
240 | rfcomm_dlc_put(d); | |
241 | rfcomm_schedule(RFCOMM_SCHED_TIMEO); | |
242 | } | |
243 | ||
244 | static void rfcomm_dlc_set_timer(struct rfcomm_dlc *d, long timeout) | |
245 | { | |
246 | BT_DBG("dlc %p state %ld timeout %ld", d, d->state, timeout); | |
247 | ||
248 | if (!mod_timer(&d->timer, jiffies + timeout)) | |
249 | rfcomm_dlc_hold(d); | |
250 | } | |
251 | ||
252 | static void rfcomm_dlc_clear_timer(struct rfcomm_dlc *d) | |
253 | { | |
254 | BT_DBG("dlc %p state %ld", d, d->state); | |
255 | ||
256 | if (timer_pending(&d->timer) && del_timer(&d->timer)) | |
257 | rfcomm_dlc_put(d); | |
258 | } | |
259 | ||
260 | static void rfcomm_dlc_clear_state(struct rfcomm_dlc *d) | |
261 | { | |
262 | BT_DBG("%p", d); | |
263 | ||
264 | d->state = BT_OPEN; | |
265 | d->flags = 0; | |
266 | d->mscex = 0; | |
267 | d->mtu = RFCOMM_DEFAULT_MTU; | |
268 | d->v24_sig = RFCOMM_V24_RTC | RFCOMM_V24_RTR | RFCOMM_V24_DV; | |
269 | ||
270 | d->cfc = RFCOMM_CFC_DISABLED; | |
271 | d->rx_credits = RFCOMM_DEFAULT_CREDITS; | |
272 | } | |
273 | ||
dd0fc66f | 274 | struct rfcomm_dlc *rfcomm_dlc_alloc(gfp_t prio) |
1da177e4 LT |
275 | { |
276 | struct rfcomm_dlc *d = kmalloc(sizeof(*d), prio); | |
277 | if (!d) | |
278 | return NULL; | |
279 | memset(d, 0, sizeof(*d)); | |
280 | ||
281 | init_timer(&d->timer); | |
282 | d->timer.function = rfcomm_dlc_timeout; | |
283 | d->timer.data = (unsigned long) d; | |
284 | ||
285 | skb_queue_head_init(&d->tx_queue); | |
286 | spin_lock_init(&d->lock); | |
287 | atomic_set(&d->refcnt, 1); | |
288 | ||
289 | rfcomm_dlc_clear_state(d); | |
290 | ||
291 | BT_DBG("%p", d); | |
292 | return d; | |
293 | } | |
294 | ||
295 | void rfcomm_dlc_free(struct rfcomm_dlc *d) | |
296 | { | |
297 | BT_DBG("%p", d); | |
298 | ||
299 | skb_queue_purge(&d->tx_queue); | |
300 | kfree(d); | |
301 | } | |
302 | ||
303 | static void rfcomm_dlc_link(struct rfcomm_session *s, struct rfcomm_dlc *d) | |
304 | { | |
305 | BT_DBG("dlc %p session %p", d, s); | |
306 | ||
307 | rfcomm_session_hold(s); | |
308 | ||
309 | rfcomm_dlc_hold(d); | |
310 | list_add(&d->list, &s->dlcs); | |
311 | d->session = s; | |
312 | } | |
313 | ||
314 | static void rfcomm_dlc_unlink(struct rfcomm_dlc *d) | |
315 | { | |
316 | struct rfcomm_session *s = d->session; | |
317 | ||
318 | BT_DBG("dlc %p refcnt %d session %p", d, atomic_read(&d->refcnt), s); | |
319 | ||
320 | list_del(&d->list); | |
321 | d->session = NULL; | |
322 | rfcomm_dlc_put(d); | |
323 | ||
324 | rfcomm_session_put(s); | |
325 | } | |
326 | ||
327 | static struct rfcomm_dlc *rfcomm_dlc_get(struct rfcomm_session *s, u8 dlci) | |
328 | { | |
329 | struct rfcomm_dlc *d; | |
330 | struct list_head *p; | |
331 | ||
332 | list_for_each(p, &s->dlcs) { | |
333 | d = list_entry(p, struct rfcomm_dlc, list); | |
334 | if (d->dlci == dlci) | |
335 | return d; | |
336 | } | |
337 | return NULL; | |
338 | } | |
339 | ||
340 | static int __rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel) | |
341 | { | |
342 | struct rfcomm_session *s; | |
343 | int err = 0; | |
344 | u8 dlci; | |
345 | ||
346 | BT_DBG("dlc %p state %ld %s %s channel %d", | |
347 | d, d->state, batostr(src), batostr(dst), channel); | |
348 | ||
349 | if (channel < 1 || channel > 30) | |
350 | return -EINVAL; | |
351 | ||
352 | if (d->state != BT_OPEN && d->state != BT_CLOSED) | |
353 | return 0; | |
354 | ||
355 | s = rfcomm_session_get(src, dst); | |
356 | if (!s) { | |
357 | s = rfcomm_session_create(src, dst, &err); | |
358 | if (!s) | |
359 | return err; | |
360 | } | |
361 | ||
362 | dlci = __dlci(!s->initiator, channel); | |
363 | ||
364 | /* Check if DLCI already exists */ | |
365 | if (rfcomm_dlc_get(s, dlci)) | |
366 | return -EBUSY; | |
367 | ||
368 | rfcomm_dlc_clear_state(d); | |
369 | ||
370 | d->dlci = dlci; | |
371 | d->addr = __addr(s->initiator, dlci); | |
372 | d->priority = 7; | |
373 | ||
374 | d->state = BT_CONFIG; | |
375 | rfcomm_dlc_link(s, d); | |
376 | ||
377 | d->mtu = s->mtu; | |
378 | d->cfc = (s->cfc == RFCOMM_CFC_UNKNOWN) ? 0 : s->cfc; | |
379 | ||
380 | if (s->state == BT_CONNECTED) | |
381 | rfcomm_send_pn(s, 1, d); | |
382 | rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT); | |
383 | return 0; | |
384 | } | |
385 | ||
386 | int rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel) | |
387 | { | |
388 | int r; | |
389 | ||
390 | rfcomm_lock(); | |
391 | ||
392 | r = __rfcomm_dlc_open(d, src, dst, channel); | |
393 | ||
394 | rfcomm_unlock(); | |
395 | return r; | |
396 | } | |
397 | ||
398 | static int __rfcomm_dlc_close(struct rfcomm_dlc *d, int err) | |
399 | { | |
400 | struct rfcomm_session *s = d->session; | |
401 | if (!s) | |
402 | return 0; | |
403 | ||
404 | BT_DBG("dlc %p state %ld dlci %d err %d session %p", | |
405 | d, d->state, d->dlci, err, s); | |
406 | ||
407 | switch (d->state) { | |
408 | case BT_CONNECTED: | |
409 | case BT_CONFIG: | |
410 | case BT_CONNECT: | |
411 | d->state = BT_DISCONN; | |
412 | if (skb_queue_empty(&d->tx_queue)) { | |
413 | rfcomm_send_disc(s, d->dlci); | |
414 | rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT); | |
415 | } else { | |
416 | rfcomm_queue_disc(d); | |
417 | rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT * 2); | |
418 | } | |
419 | break; | |
420 | ||
421 | default: | |
422 | rfcomm_dlc_clear_timer(d); | |
423 | ||
424 | rfcomm_dlc_lock(d); | |
425 | d->state = BT_CLOSED; | |
426 | d->state_change(d, err); | |
427 | rfcomm_dlc_unlock(d); | |
428 | ||
429 | skb_queue_purge(&d->tx_queue); | |
1da177e4 LT |
430 | rfcomm_dlc_unlink(d); |
431 | } | |
432 | ||
433 | return 0; | |
434 | } | |
435 | ||
436 | int rfcomm_dlc_close(struct rfcomm_dlc *d, int err) | |
437 | { | |
438 | int r; | |
439 | ||
440 | rfcomm_lock(); | |
441 | ||
442 | r = __rfcomm_dlc_close(d, err); | |
443 | ||
444 | rfcomm_unlock(); | |
445 | return r; | |
446 | } | |
447 | ||
448 | int rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb) | |
449 | { | |
450 | int len = skb->len; | |
451 | ||
452 | if (d->state != BT_CONNECTED) | |
453 | return -ENOTCONN; | |
454 | ||
455 | BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len); | |
456 | ||
457 | if (len > d->mtu) | |
458 | return -EINVAL; | |
459 | ||
460 | rfcomm_make_uih(skb, d->addr); | |
461 | skb_queue_tail(&d->tx_queue, skb); | |
462 | ||
463 | if (!test_bit(RFCOMM_TX_THROTTLED, &d->flags)) | |
464 | rfcomm_schedule(RFCOMM_SCHED_TX); | |
465 | return len; | |
466 | } | |
467 | ||
468 | void fastcall __rfcomm_dlc_throttle(struct rfcomm_dlc *d) | |
469 | { | |
470 | BT_DBG("dlc %p state %ld", d, d->state); | |
471 | ||
472 | if (!d->cfc) { | |
473 | d->v24_sig |= RFCOMM_V24_FC; | |
474 | set_bit(RFCOMM_MSC_PENDING, &d->flags); | |
475 | } | |
476 | rfcomm_schedule(RFCOMM_SCHED_TX); | |
477 | } | |
478 | ||
479 | void fastcall __rfcomm_dlc_unthrottle(struct rfcomm_dlc *d) | |
480 | { | |
481 | BT_DBG("dlc %p state %ld", d, d->state); | |
482 | ||
483 | if (!d->cfc) { | |
484 | d->v24_sig &= ~RFCOMM_V24_FC; | |
485 | set_bit(RFCOMM_MSC_PENDING, &d->flags); | |
486 | } | |
487 | rfcomm_schedule(RFCOMM_SCHED_TX); | |
488 | } | |
489 | ||
490 | /* | |
491 | Set/get modem status functions use _local_ status i.e. what we report | |
492 | to the other side. | |
493 | Remote status is provided by dlc->modem_status() callback. | |
494 | */ | |
495 | int rfcomm_dlc_set_modem_status(struct rfcomm_dlc *d, u8 v24_sig) | |
496 | { | |
497 | BT_DBG("dlc %p state %ld v24_sig 0x%x", | |
498 | d, d->state, v24_sig); | |
499 | ||
500 | if (test_bit(RFCOMM_RX_THROTTLED, &d->flags)) | |
501 | v24_sig |= RFCOMM_V24_FC; | |
502 | else | |
503 | v24_sig &= ~RFCOMM_V24_FC; | |
504 | ||
505 | d->v24_sig = v24_sig; | |
506 | ||
507 | if (!test_and_set_bit(RFCOMM_MSC_PENDING, &d->flags)) | |
508 | rfcomm_schedule(RFCOMM_SCHED_TX); | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
513 | int rfcomm_dlc_get_modem_status(struct rfcomm_dlc *d, u8 *v24_sig) | |
514 | { | |
515 | BT_DBG("dlc %p state %ld v24_sig 0x%x", | |
516 | d, d->state, d->v24_sig); | |
517 | ||
518 | *v24_sig = d->v24_sig; | |
519 | return 0; | |
520 | } | |
521 | ||
522 | /* ---- RFCOMM sessions ---- */ | |
523 | static struct rfcomm_session *rfcomm_session_add(struct socket *sock, int state) | |
524 | { | |
525 | struct rfcomm_session *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
526 | if (!s) | |
527 | return NULL; | |
528 | memset(s, 0, sizeof(*s)); | |
529 | ||
530 | BT_DBG("session %p sock %p", s, sock); | |
531 | ||
532 | INIT_LIST_HEAD(&s->dlcs); | |
533 | s->state = state; | |
534 | s->sock = sock; | |
535 | ||
536 | s->mtu = RFCOMM_DEFAULT_MTU; | |
537 | s->cfc = RFCOMM_CFC_UNKNOWN; | |
538 | ||
539 | /* Do not increment module usage count for listening sessions. | |
540 | * Otherwise we won't be able to unload the module. */ | |
541 | if (state != BT_LISTEN) | |
542 | if (!try_module_get(THIS_MODULE)) { | |
543 | kfree(s); | |
544 | return NULL; | |
545 | } | |
546 | ||
547 | list_add(&s->list, &session_list); | |
548 | ||
549 | return s; | |
550 | } | |
551 | ||
552 | static void rfcomm_session_del(struct rfcomm_session *s) | |
553 | { | |
554 | int state = s->state; | |
555 | ||
556 | BT_DBG("session %p state %ld", s, s->state); | |
557 | ||
558 | list_del(&s->list); | |
559 | ||
560 | if (state == BT_CONNECTED) | |
561 | rfcomm_send_disc(s, 0); | |
562 | ||
563 | sock_release(s->sock); | |
564 | kfree(s); | |
565 | ||
566 | if (state != BT_LISTEN) | |
567 | module_put(THIS_MODULE); | |
568 | } | |
569 | ||
570 | static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst) | |
571 | { | |
572 | struct rfcomm_session *s; | |
573 | struct list_head *p, *n; | |
574 | struct bt_sock *sk; | |
575 | list_for_each_safe(p, n, &session_list) { | |
576 | s = list_entry(p, struct rfcomm_session, list); | |
577 | sk = bt_sk(s->sock->sk); | |
578 | ||
579 | if ((!bacmp(src, BDADDR_ANY) || !bacmp(&sk->src, src)) && | |
580 | !bacmp(&sk->dst, dst)) | |
581 | return s; | |
582 | } | |
583 | return NULL; | |
584 | } | |
585 | ||
586 | static void rfcomm_session_close(struct rfcomm_session *s, int err) | |
587 | { | |
588 | struct rfcomm_dlc *d; | |
589 | struct list_head *p, *n; | |
590 | ||
591 | BT_DBG("session %p state %ld err %d", s, s->state, err); | |
592 | ||
593 | rfcomm_session_hold(s); | |
594 | ||
595 | s->state = BT_CLOSED; | |
596 | ||
597 | /* Close all dlcs */ | |
598 | list_for_each_safe(p, n, &s->dlcs) { | |
599 | d = list_entry(p, struct rfcomm_dlc, list); | |
600 | d->state = BT_CLOSED; | |
601 | __rfcomm_dlc_close(d, err); | |
602 | } | |
603 | ||
604 | rfcomm_session_put(s); | |
605 | } | |
606 | ||
607 | static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src, bdaddr_t *dst, int *err) | |
608 | { | |
609 | struct rfcomm_session *s = NULL; | |
610 | struct sockaddr_l2 addr; | |
611 | struct socket *sock; | |
612 | struct sock *sk; | |
613 | ||
614 | BT_DBG("%s %s", batostr(src), batostr(dst)); | |
615 | ||
616 | *err = rfcomm_l2sock_create(&sock); | |
617 | if (*err < 0) | |
618 | return NULL; | |
619 | ||
620 | bacpy(&addr.l2_bdaddr, src); | |
621 | addr.l2_family = AF_BLUETOOTH; | |
622 | addr.l2_psm = 0; | |
623 | *err = sock->ops->bind(sock, (struct sockaddr *) &addr, sizeof(addr)); | |
624 | if (*err < 0) | |
625 | goto failed; | |
626 | ||
627 | /* Set L2CAP options */ | |
628 | sk = sock->sk; | |
629 | lock_sock(sk); | |
56f3a40a | 630 | l2cap_pi(sk)->imtu = l2cap_mtu; |
1da177e4 LT |
631 | release_sock(sk); |
632 | ||
633 | s = rfcomm_session_add(sock, BT_BOUND); | |
634 | if (!s) { | |
635 | *err = -ENOMEM; | |
636 | goto failed; | |
637 | } | |
638 | ||
1da177e4 LT |
639 | s->initiator = 1; |
640 | ||
641 | bacpy(&addr.l2_bdaddr, dst); | |
642 | addr.l2_family = AF_BLUETOOTH; | |
643 | addr.l2_psm = htobs(RFCOMM_PSM); | |
644 | *err = sock->ops->connect(sock, (struct sockaddr *) &addr, sizeof(addr), O_NONBLOCK); | |
645 | if (*err == 0 || *err == -EAGAIN) | |
646 | return s; | |
647 | ||
648 | rfcomm_session_del(s); | |
649 | return NULL; | |
650 | ||
651 | failed: | |
652 | sock_release(sock); | |
653 | return NULL; | |
654 | } | |
655 | ||
656 | void rfcomm_session_getaddr(struct rfcomm_session *s, bdaddr_t *src, bdaddr_t *dst) | |
657 | { | |
658 | struct sock *sk = s->sock->sk; | |
659 | if (src) | |
660 | bacpy(src, &bt_sk(sk)->src); | |
661 | if (dst) | |
662 | bacpy(dst, &bt_sk(sk)->dst); | |
663 | } | |
664 | ||
665 | /* ---- RFCOMM frame sending ---- */ | |
666 | static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len) | |
667 | { | |
668 | struct socket *sock = s->sock; | |
669 | struct kvec iv = { data, len }; | |
670 | struct msghdr msg; | |
671 | ||
672 | BT_DBG("session %p len %d", s, len); | |
673 | ||
674 | memset(&msg, 0, sizeof(msg)); | |
675 | ||
676 | return kernel_sendmsg(sock, &msg, &iv, 1, len); | |
677 | } | |
678 | ||
679 | static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci) | |
680 | { | |
681 | struct rfcomm_cmd cmd; | |
682 | ||
683 | BT_DBG("%p dlci %d", s, dlci); | |
684 | ||
685 | cmd.addr = __addr(s->initiator, dlci); | |
686 | cmd.ctrl = __ctrl(RFCOMM_SABM, 1); | |
687 | cmd.len = __len8(0); | |
688 | cmd.fcs = __fcs2((u8 *) &cmd); | |
689 | ||
690 | return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd)); | |
691 | } | |
692 | ||
693 | static int rfcomm_send_ua(struct rfcomm_session *s, u8 dlci) | |
694 | { | |
695 | struct rfcomm_cmd cmd; | |
696 | ||
697 | BT_DBG("%p dlci %d", s, dlci); | |
698 | ||
699 | cmd.addr = __addr(!s->initiator, dlci); | |
700 | cmd.ctrl = __ctrl(RFCOMM_UA, 1); | |
701 | cmd.len = __len8(0); | |
702 | cmd.fcs = __fcs2((u8 *) &cmd); | |
703 | ||
704 | return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd)); | |
705 | } | |
706 | ||
707 | static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci) | |
708 | { | |
709 | struct rfcomm_cmd cmd; | |
710 | ||
711 | BT_DBG("%p dlci %d", s, dlci); | |
712 | ||
713 | cmd.addr = __addr(s->initiator, dlci); | |
714 | cmd.ctrl = __ctrl(RFCOMM_DISC, 1); | |
715 | cmd.len = __len8(0); | |
716 | cmd.fcs = __fcs2((u8 *) &cmd); | |
717 | ||
718 | return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd)); | |
719 | } | |
720 | ||
721 | static int rfcomm_queue_disc(struct rfcomm_dlc *d) | |
722 | { | |
723 | struct rfcomm_cmd *cmd; | |
724 | struct sk_buff *skb; | |
725 | ||
726 | BT_DBG("dlc %p dlci %d", d, d->dlci); | |
727 | ||
728 | skb = alloc_skb(sizeof(*cmd), GFP_KERNEL); | |
729 | if (!skb) | |
730 | return -ENOMEM; | |
731 | ||
732 | cmd = (void *) __skb_put(skb, sizeof(*cmd)); | |
733 | cmd->addr = d->addr; | |
734 | cmd->ctrl = __ctrl(RFCOMM_DISC, 1); | |
735 | cmd->len = __len8(0); | |
736 | cmd->fcs = __fcs2((u8 *) cmd); | |
737 | ||
738 | skb_queue_tail(&d->tx_queue, skb); | |
739 | rfcomm_schedule(RFCOMM_SCHED_TX); | |
740 | return 0; | |
741 | } | |
742 | ||
743 | static int rfcomm_send_dm(struct rfcomm_session *s, u8 dlci) | |
744 | { | |
745 | struct rfcomm_cmd cmd; | |
746 | ||
747 | BT_DBG("%p dlci %d", s, dlci); | |
748 | ||
749 | cmd.addr = __addr(!s->initiator, dlci); | |
750 | cmd.ctrl = __ctrl(RFCOMM_DM, 1); | |
751 | cmd.len = __len8(0); | |
752 | cmd.fcs = __fcs2((u8 *) &cmd); | |
753 | ||
754 | return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd)); | |
755 | } | |
756 | ||
757 | static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type) | |
758 | { | |
759 | struct rfcomm_hdr *hdr; | |
760 | struct rfcomm_mcc *mcc; | |
761 | u8 buf[16], *ptr = buf; | |
762 | ||
763 | BT_DBG("%p cr %d type %d", s, cr, type); | |
764 | ||
765 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
766 | hdr->addr = __addr(s->initiator, 0); | |
767 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
768 | hdr->len = __len8(sizeof(*mcc) + 1); | |
769 | ||
770 | mcc = (void *) ptr; ptr += sizeof(*mcc); | |
771 | mcc->type = __mcc_type(cr, RFCOMM_NSC); | |
772 | mcc->len = __len8(1); | |
773 | ||
774 | /* Type that we didn't like */ | |
775 | *ptr = __mcc_type(cr, type); ptr++; | |
776 | ||
777 | *ptr = __fcs(buf); ptr++; | |
778 | ||
779 | return rfcomm_send_frame(s, buf, ptr - buf); | |
780 | } | |
781 | ||
782 | static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d) | |
783 | { | |
784 | struct rfcomm_hdr *hdr; | |
785 | struct rfcomm_mcc *mcc; | |
786 | struct rfcomm_pn *pn; | |
787 | u8 buf[16], *ptr = buf; | |
788 | ||
789 | BT_DBG("%p cr %d dlci %d mtu %d", s, cr, d->dlci, d->mtu); | |
790 | ||
791 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
792 | hdr->addr = __addr(s->initiator, 0); | |
793 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
794 | hdr->len = __len8(sizeof(*mcc) + sizeof(*pn)); | |
795 | ||
796 | mcc = (void *) ptr; ptr += sizeof(*mcc); | |
797 | mcc->type = __mcc_type(cr, RFCOMM_PN); | |
798 | mcc->len = __len8(sizeof(*pn)); | |
799 | ||
800 | pn = (void *) ptr; ptr += sizeof(*pn); | |
801 | pn->dlci = d->dlci; | |
802 | pn->priority = d->priority; | |
803 | pn->ack_timer = 0; | |
804 | pn->max_retrans = 0; | |
805 | ||
806 | if (s->cfc) { | |
807 | pn->flow_ctrl = cr ? 0xf0 : 0xe0; | |
808 | pn->credits = RFCOMM_DEFAULT_CREDITS; | |
809 | } else { | |
810 | pn->flow_ctrl = 0; | |
811 | pn->credits = 0; | |
812 | } | |
813 | ||
814 | pn->mtu = htobs(d->mtu); | |
815 | ||
816 | *ptr = __fcs(buf); ptr++; | |
817 | ||
818 | return rfcomm_send_frame(s, buf, ptr - buf); | |
819 | } | |
820 | ||
3a5e903c S |
821 | int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci, |
822 | u8 bit_rate, u8 data_bits, u8 stop_bits, | |
823 | u8 parity, u8 flow_ctrl_settings, | |
824 | u8 xon_char, u8 xoff_char, u16 param_mask) | |
1da177e4 LT |
825 | { |
826 | struct rfcomm_hdr *hdr; | |
827 | struct rfcomm_mcc *mcc; | |
828 | struct rfcomm_rpn *rpn; | |
829 | u8 buf[16], *ptr = buf; | |
830 | ||
831 | BT_DBG("%p cr %d dlci %d bit_r 0x%x data_b 0x%x stop_b 0x%x parity 0x%x" | |
3a5e903c S |
832 | " flwc_s 0x%x xon_c 0x%x xoff_c 0x%x p_mask 0x%x", |
833 | s, cr, dlci, bit_rate, data_bits, stop_bits, parity, | |
834 | flow_ctrl_settings, xon_char, xoff_char, param_mask); | |
1da177e4 LT |
835 | |
836 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
837 | hdr->addr = __addr(s->initiator, 0); | |
838 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
839 | hdr->len = __len8(sizeof(*mcc) + sizeof(*rpn)); | |
840 | ||
841 | mcc = (void *) ptr; ptr += sizeof(*mcc); | |
842 | mcc->type = __mcc_type(cr, RFCOMM_RPN); | |
843 | mcc->len = __len8(sizeof(*rpn)); | |
844 | ||
845 | rpn = (void *) ptr; ptr += sizeof(*rpn); | |
846 | rpn->dlci = __addr(1, dlci); | |
847 | rpn->bit_rate = bit_rate; | |
848 | rpn->line_settings = __rpn_line_settings(data_bits, stop_bits, parity); | |
849 | rpn->flow_ctrl = flow_ctrl_settings; | |
850 | rpn->xon_char = xon_char; | |
851 | rpn->xoff_char = xoff_char; | |
852 | rpn->param_mask = param_mask; | |
853 | ||
854 | *ptr = __fcs(buf); ptr++; | |
855 | ||
856 | return rfcomm_send_frame(s, buf, ptr - buf); | |
857 | } | |
858 | ||
859 | static int rfcomm_send_rls(struct rfcomm_session *s, int cr, u8 dlci, u8 status) | |
860 | { | |
861 | struct rfcomm_hdr *hdr; | |
862 | struct rfcomm_mcc *mcc; | |
863 | struct rfcomm_rls *rls; | |
864 | u8 buf[16], *ptr = buf; | |
865 | ||
866 | BT_DBG("%p cr %d status 0x%x", s, cr, status); | |
867 | ||
868 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
869 | hdr->addr = __addr(s->initiator, 0); | |
870 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
871 | hdr->len = __len8(sizeof(*mcc) + sizeof(*rls)); | |
872 | ||
873 | mcc = (void *) ptr; ptr += sizeof(*mcc); | |
874 | mcc->type = __mcc_type(cr, RFCOMM_RLS); | |
875 | mcc->len = __len8(sizeof(*rls)); | |
876 | ||
877 | rls = (void *) ptr; ptr += sizeof(*rls); | |
878 | rls->dlci = __addr(1, dlci); | |
879 | rls->status = status; | |
880 | ||
881 | *ptr = __fcs(buf); ptr++; | |
882 | ||
883 | return rfcomm_send_frame(s, buf, ptr - buf); | |
884 | } | |
885 | ||
886 | static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig) | |
887 | { | |
888 | struct rfcomm_hdr *hdr; | |
889 | struct rfcomm_mcc *mcc; | |
890 | struct rfcomm_msc *msc; | |
891 | u8 buf[16], *ptr = buf; | |
892 | ||
893 | BT_DBG("%p cr %d v24 0x%x", s, cr, v24_sig); | |
894 | ||
895 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
896 | hdr->addr = __addr(s->initiator, 0); | |
897 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
898 | hdr->len = __len8(sizeof(*mcc) + sizeof(*msc)); | |
899 | ||
900 | mcc = (void *) ptr; ptr += sizeof(*mcc); | |
901 | mcc->type = __mcc_type(cr, RFCOMM_MSC); | |
902 | mcc->len = __len8(sizeof(*msc)); | |
903 | ||
904 | msc = (void *) ptr; ptr += sizeof(*msc); | |
905 | msc->dlci = __addr(1, dlci); | |
906 | msc->v24_sig = v24_sig | 0x01; | |
907 | ||
908 | *ptr = __fcs(buf); ptr++; | |
909 | ||
910 | return rfcomm_send_frame(s, buf, ptr - buf); | |
911 | } | |
912 | ||
913 | static int rfcomm_send_fcoff(struct rfcomm_session *s, int cr) | |
914 | { | |
915 | struct rfcomm_hdr *hdr; | |
916 | struct rfcomm_mcc *mcc; | |
917 | u8 buf[16], *ptr = buf; | |
918 | ||
919 | BT_DBG("%p cr %d", s, cr); | |
920 | ||
921 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
922 | hdr->addr = __addr(s->initiator, 0); | |
923 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
924 | hdr->len = __len8(sizeof(*mcc)); | |
925 | ||
926 | mcc = (void *) ptr; ptr += sizeof(*mcc); | |
927 | mcc->type = __mcc_type(cr, RFCOMM_FCOFF); | |
928 | mcc->len = __len8(0); | |
929 | ||
930 | *ptr = __fcs(buf); ptr++; | |
931 | ||
932 | return rfcomm_send_frame(s, buf, ptr - buf); | |
933 | } | |
934 | ||
935 | static int rfcomm_send_fcon(struct rfcomm_session *s, int cr) | |
936 | { | |
937 | struct rfcomm_hdr *hdr; | |
938 | struct rfcomm_mcc *mcc; | |
939 | u8 buf[16], *ptr = buf; | |
940 | ||
941 | BT_DBG("%p cr %d", s, cr); | |
942 | ||
943 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
944 | hdr->addr = __addr(s->initiator, 0); | |
945 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
946 | hdr->len = __len8(sizeof(*mcc)); | |
947 | ||
948 | mcc = (void *) ptr; ptr += sizeof(*mcc); | |
949 | mcc->type = __mcc_type(cr, RFCOMM_FCON); | |
950 | mcc->len = __len8(0); | |
951 | ||
952 | *ptr = __fcs(buf); ptr++; | |
953 | ||
954 | return rfcomm_send_frame(s, buf, ptr - buf); | |
955 | } | |
956 | ||
957 | static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len) | |
958 | { | |
959 | struct socket *sock = s->sock; | |
960 | struct kvec iv[3]; | |
961 | struct msghdr msg; | |
962 | unsigned char hdr[5], crc[1]; | |
963 | ||
964 | if (len > 125) | |
965 | return -EINVAL; | |
966 | ||
967 | BT_DBG("%p cr %d", s, cr); | |
968 | ||
969 | hdr[0] = __addr(s->initiator, 0); | |
970 | hdr[1] = __ctrl(RFCOMM_UIH, 0); | |
971 | hdr[2] = 0x01 | ((len + 2) << 1); | |
972 | hdr[3] = 0x01 | ((cr & 0x01) << 1) | (RFCOMM_TEST << 2); | |
973 | hdr[4] = 0x01 | (len << 1); | |
974 | ||
975 | crc[0] = __fcs(hdr); | |
976 | ||
977 | iv[0].iov_base = hdr; | |
978 | iv[0].iov_len = 5; | |
979 | iv[1].iov_base = pattern; | |
980 | iv[1].iov_len = len; | |
981 | iv[2].iov_base = crc; | |
982 | iv[2].iov_len = 1; | |
983 | ||
984 | memset(&msg, 0, sizeof(msg)); | |
985 | ||
986 | return kernel_sendmsg(sock, &msg, iv, 3, 6 + len); | |
987 | } | |
988 | ||
989 | static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits) | |
990 | { | |
991 | struct rfcomm_hdr *hdr; | |
992 | u8 buf[16], *ptr = buf; | |
993 | ||
994 | BT_DBG("%p addr %d credits %d", s, addr, credits); | |
995 | ||
996 | hdr = (void *) ptr; ptr += sizeof(*hdr); | |
997 | hdr->addr = addr; | |
998 | hdr->ctrl = __ctrl(RFCOMM_UIH, 1); | |
999 | hdr->len = __len8(0); | |
1000 | ||
1001 | *ptr = credits; ptr++; | |
1002 | ||
1003 | *ptr = __fcs(buf); ptr++; | |
1004 | ||
1005 | return rfcomm_send_frame(s, buf, ptr - buf); | |
1006 | } | |
1007 | ||
1008 | static void rfcomm_make_uih(struct sk_buff *skb, u8 addr) | |
1009 | { | |
1010 | struct rfcomm_hdr *hdr; | |
1011 | int len = skb->len; | |
1012 | u8 *crc; | |
1013 | ||
1014 | if (len > 127) { | |
1015 | hdr = (void *) skb_push(skb, 4); | |
1016 | put_unaligned(htobs(__len16(len)), (u16 *) &hdr->len); | |
1017 | } else { | |
1018 | hdr = (void *) skb_push(skb, 3); | |
1019 | hdr->len = __len8(len); | |
1020 | } | |
1021 | hdr->addr = addr; | |
1022 | hdr->ctrl = __ctrl(RFCOMM_UIH, 0); | |
1023 | ||
1024 | crc = skb_put(skb, 1); | |
1025 | *crc = __fcs((void *) hdr); | |
1026 | } | |
1027 | ||
1028 | /* ---- RFCOMM frame reception ---- */ | |
1029 | static int rfcomm_recv_ua(struct rfcomm_session *s, u8 dlci) | |
1030 | { | |
1031 | BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); | |
1032 | ||
1033 | if (dlci) { | |
1034 | /* Data channel */ | |
1035 | struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci); | |
1036 | if (!d) { | |
1037 | rfcomm_send_dm(s, dlci); | |
1038 | return 0; | |
1039 | } | |
1040 | ||
1041 | switch (d->state) { | |
1042 | case BT_CONNECT: | |
1043 | rfcomm_dlc_clear_timer(d); | |
1044 | ||
1045 | rfcomm_dlc_lock(d); | |
1046 | d->state = BT_CONNECTED; | |
1047 | d->state_change(d, 0); | |
1048 | rfcomm_dlc_unlock(d); | |
1049 | ||
1050 | rfcomm_send_msc(s, 1, dlci, d->v24_sig); | |
1051 | break; | |
1052 | ||
1053 | case BT_DISCONN: | |
1054 | d->state = BT_CLOSED; | |
1055 | __rfcomm_dlc_close(d, 0); | |
1056 | break; | |
1057 | } | |
1058 | } else { | |
1059 | /* Control channel */ | |
1060 | switch (s->state) { | |
1061 | case BT_CONNECT: | |
1062 | s->state = BT_CONNECTED; | |
1063 | rfcomm_process_connect(s); | |
1064 | break; | |
1065 | } | |
1066 | } | |
1067 | return 0; | |
1068 | } | |
1069 | ||
1070 | static int rfcomm_recv_dm(struct rfcomm_session *s, u8 dlci) | |
1071 | { | |
1072 | int err = 0; | |
1073 | ||
1074 | BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); | |
1075 | ||
1076 | if (dlci) { | |
1077 | /* Data DLC */ | |
1078 | struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci); | |
1079 | if (d) { | |
1080 | if (d->state == BT_CONNECT || d->state == BT_CONFIG) | |
1081 | err = ECONNREFUSED; | |
1082 | else | |
1083 | err = ECONNRESET; | |
1084 | ||
1085 | d->state = BT_CLOSED; | |
1086 | __rfcomm_dlc_close(d, err); | |
1087 | } | |
1088 | } else { | |
1089 | if (s->state == BT_CONNECT) | |
1090 | err = ECONNREFUSED; | |
1091 | else | |
1092 | err = ECONNRESET; | |
1093 | ||
1094 | s->state = BT_CLOSED; | |
1095 | rfcomm_session_close(s, err); | |
1096 | } | |
1097 | return 0; | |
1098 | } | |
1099 | ||
1100 | static int rfcomm_recv_disc(struct rfcomm_session *s, u8 dlci) | |
1101 | { | |
1102 | int err = 0; | |
1103 | ||
1104 | BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); | |
1105 | ||
1106 | if (dlci) { | |
1107 | struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci); | |
1108 | if (d) { | |
1109 | rfcomm_send_ua(s, dlci); | |
1110 | ||
1111 | if (d->state == BT_CONNECT || d->state == BT_CONFIG) | |
1112 | err = ECONNREFUSED; | |
1113 | else | |
1114 | err = ECONNRESET; | |
1115 | ||
1116 | d->state = BT_CLOSED; | |
1117 | __rfcomm_dlc_close(d, err); | |
1118 | } else | |
1119 | rfcomm_send_dm(s, dlci); | |
1120 | ||
1121 | } else { | |
1122 | rfcomm_send_ua(s, 0); | |
1123 | ||
1124 | if (s->state == BT_CONNECT) | |
1125 | err = ECONNREFUSED; | |
1126 | else | |
1127 | err = ECONNRESET; | |
1128 | ||
1129 | s->state = BT_CLOSED; | |
1130 | rfcomm_session_close(s, err); | |
1131 | } | |
1132 | ||
1133 | return 0; | |
1134 | } | |
1135 | ||
1136 | static inline int rfcomm_check_link_mode(struct rfcomm_dlc *d) | |
1137 | { | |
1138 | struct sock *sk = d->session->sock->sk; | |
1139 | ||
1140 | if (d->link_mode & (RFCOMM_LM_ENCRYPT | RFCOMM_LM_SECURE)) { | |
1141 | if (!hci_conn_encrypt(l2cap_pi(sk)->conn->hcon)) | |
1142 | return 1; | |
1143 | } else if (d->link_mode & RFCOMM_LM_AUTH) { | |
1144 | if (!hci_conn_auth(l2cap_pi(sk)->conn->hcon)) | |
1145 | return 1; | |
1146 | } | |
1147 | ||
1148 | return 0; | |
1149 | } | |
1150 | ||
1151 | static void rfcomm_dlc_accept(struct rfcomm_dlc *d) | |
1152 | { | |
1153 | BT_DBG("dlc %p", d); | |
1154 | ||
1155 | rfcomm_send_ua(d->session, d->dlci); | |
1156 | ||
1157 | rfcomm_dlc_lock(d); | |
1158 | d->state = BT_CONNECTED; | |
1159 | d->state_change(d, 0); | |
1160 | rfcomm_dlc_unlock(d); | |
1161 | ||
1162 | rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig); | |
1163 | } | |
1164 | ||
1165 | static int rfcomm_recv_sabm(struct rfcomm_session *s, u8 dlci) | |
1166 | { | |
1167 | struct rfcomm_dlc *d; | |
1168 | u8 channel; | |
1169 | ||
1170 | BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); | |
1171 | ||
1172 | if (!dlci) { | |
1173 | rfcomm_send_ua(s, 0); | |
1174 | ||
1175 | if (s->state == BT_OPEN) { | |
1176 | s->state = BT_CONNECTED; | |
1177 | rfcomm_process_connect(s); | |
1178 | } | |
1179 | return 0; | |
1180 | } | |
1181 | ||
1182 | /* Check if DLC exists */ | |
1183 | d = rfcomm_dlc_get(s, dlci); | |
1184 | if (d) { | |
1185 | if (d->state == BT_OPEN) { | |
1186 | /* DLC was previously opened by PN request */ | |
1187 | if (rfcomm_check_link_mode(d)) { | |
1188 | set_bit(RFCOMM_AUTH_PENDING, &d->flags); | |
1189 | rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); | |
1190 | return 0; | |
1191 | } | |
1192 | ||
1193 | rfcomm_dlc_accept(d); | |
1194 | } | |
1195 | return 0; | |
1196 | } | |
1197 | ||
1198 | /* Notify socket layer about incoming connection */ | |
1199 | channel = __srv_channel(dlci); | |
1200 | if (rfcomm_connect_ind(s, channel, &d)) { | |
1201 | d->dlci = dlci; | |
1202 | d->addr = __addr(s->initiator, dlci); | |
1203 | rfcomm_dlc_link(s, d); | |
1204 | ||
1205 | if (rfcomm_check_link_mode(d)) { | |
1206 | set_bit(RFCOMM_AUTH_PENDING, &d->flags); | |
1207 | rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); | |
1208 | return 0; | |
1209 | } | |
1210 | ||
1211 | rfcomm_dlc_accept(d); | |
1212 | } else { | |
1213 | rfcomm_send_dm(s, dlci); | |
1214 | } | |
1215 | ||
1216 | return 0; | |
1217 | } | |
1218 | ||
1219 | static int rfcomm_apply_pn(struct rfcomm_dlc *d, int cr, struct rfcomm_pn *pn) | |
1220 | { | |
1221 | struct rfcomm_session *s = d->session; | |
1222 | ||
1223 | BT_DBG("dlc %p state %ld dlci %d mtu %d fc 0x%x credits %d", | |
1224 | d, d->state, d->dlci, pn->mtu, pn->flow_ctrl, pn->credits); | |
1225 | ||
1226 | if (pn->flow_ctrl == 0xf0 || pn->flow_ctrl == 0xe0) { | |
1227 | d->cfc = s->cfc = RFCOMM_CFC_ENABLED; | |
1228 | d->tx_credits = pn->credits; | |
1229 | } else { | |
1230 | d->cfc = s->cfc = RFCOMM_CFC_DISABLED; | |
1231 | set_bit(RFCOMM_TX_THROTTLED, &d->flags); | |
1232 | } | |
1233 | ||
1234 | d->priority = pn->priority; | |
1235 | ||
1236 | d->mtu = s->mtu = btohs(pn->mtu); | |
1237 | ||
1238 | return 0; | |
1239 | } | |
1240 | ||
1241 | static int rfcomm_recv_pn(struct rfcomm_session *s, int cr, struct sk_buff *skb) | |
1242 | { | |
1243 | struct rfcomm_pn *pn = (void *) skb->data; | |
1244 | struct rfcomm_dlc *d; | |
1245 | u8 dlci = pn->dlci; | |
1246 | ||
1247 | BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); | |
1248 | ||
1249 | if (!dlci) | |
1250 | return 0; | |
1251 | ||
1252 | d = rfcomm_dlc_get(s, dlci); | |
1253 | if (d) { | |
1254 | if (cr) { | |
1255 | /* PN request */ | |
1256 | rfcomm_apply_pn(d, cr, pn); | |
1257 | rfcomm_send_pn(s, 0, d); | |
1258 | } else { | |
1259 | /* PN response */ | |
1260 | switch (d->state) { | |
1261 | case BT_CONFIG: | |
1262 | rfcomm_apply_pn(d, cr, pn); | |
1263 | ||
1264 | d->state = BT_CONNECT; | |
1265 | rfcomm_send_sabm(s, d->dlci); | |
1266 | break; | |
1267 | } | |
1268 | } | |
1269 | } else { | |
1270 | u8 channel = __srv_channel(dlci); | |
1271 | ||
1272 | if (!cr) | |
1273 | return 0; | |
1274 | ||
1275 | /* PN request for non existing DLC. | |
1276 | * Assume incoming connection. */ | |
1277 | if (rfcomm_connect_ind(s, channel, &d)) { | |
1278 | d->dlci = dlci; | |
1279 | d->addr = __addr(s->initiator, dlci); | |
1280 | rfcomm_dlc_link(s, d); | |
1281 | ||
1282 | rfcomm_apply_pn(d, cr, pn); | |
1283 | ||
1284 | d->state = BT_OPEN; | |
1285 | rfcomm_send_pn(s, 0, d); | |
1286 | } else { | |
1287 | rfcomm_send_dm(s, dlci); | |
1288 | } | |
1289 | } | |
1290 | return 0; | |
1291 | } | |
1292 | ||
1293 | static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_buff *skb) | |
1294 | { | |
1295 | struct rfcomm_rpn *rpn = (void *) skb->data; | |
1296 | u8 dlci = __get_dlci(rpn->dlci); | |
1297 | ||
1298 | u8 bit_rate = 0; | |
1299 | u8 data_bits = 0; | |
1300 | u8 stop_bits = 0; | |
1301 | u8 parity = 0; | |
1302 | u8 flow_ctrl = 0; | |
1303 | u8 xon_char = 0; | |
1304 | u8 xoff_char = 0; | |
1305 | u16 rpn_mask = RFCOMM_RPN_PM_ALL; | |
3a5e903c S |
1306 | |
1307 | BT_DBG("dlci %d cr %d len 0x%x bitr 0x%x line 0x%x flow 0x%x xonc 0x%x xoffc 0x%x pm 0x%x", | |
1308 | dlci, cr, len, rpn->bit_rate, rpn->line_settings, rpn->flow_ctrl, | |
1309 | rpn->xon_char, rpn->xoff_char, rpn->param_mask); | |
1310 | ||
1311 | if (!cr) | |
1da177e4 | 1312 | return 0; |
3a5e903c | 1313 | |
1da177e4 | 1314 | if (len == 1) { |
3a5e903c | 1315 | /* This is a request, return default settings */ |
1da177e4 LT |
1316 | bit_rate = RFCOMM_RPN_BR_115200; |
1317 | data_bits = RFCOMM_RPN_DATA_8; | |
1318 | stop_bits = RFCOMM_RPN_STOP_1; | |
1319 | parity = RFCOMM_RPN_PARITY_NONE; | |
1320 | flow_ctrl = RFCOMM_RPN_FLOW_NONE; | |
1321 | xon_char = RFCOMM_RPN_XON_CHAR; | |
1322 | xoff_char = RFCOMM_RPN_XOFF_CHAR; | |
1da177e4 LT |
1323 | goto rpn_out; |
1324 | } | |
3a5e903c S |
1325 | |
1326 | /* Check for sane values, ignore/accept bit_rate, 8 bits, 1 stop bit, | |
1327 | * no parity, no flow control lines, normal XON/XOFF chars */ | |
1328 | ||
1da177e4 LT |
1329 | if (rpn->param_mask & RFCOMM_RPN_PM_BITRATE) { |
1330 | bit_rate = rpn->bit_rate; | |
1331 | if (bit_rate != RFCOMM_RPN_BR_115200) { | |
1332 | BT_DBG("RPN bit rate mismatch 0x%x", bit_rate); | |
1333 | bit_rate = RFCOMM_RPN_BR_115200; | |
1334 | rpn_mask ^= RFCOMM_RPN_PM_BITRATE; | |
1335 | } | |
1336 | } | |
3a5e903c | 1337 | |
1da177e4 LT |
1338 | if (rpn->param_mask & RFCOMM_RPN_PM_DATA) { |
1339 | data_bits = __get_rpn_data_bits(rpn->line_settings); | |
1340 | if (data_bits != RFCOMM_RPN_DATA_8) { | |
1341 | BT_DBG("RPN data bits mismatch 0x%x", data_bits); | |
1342 | data_bits = RFCOMM_RPN_DATA_8; | |
1343 | rpn_mask ^= RFCOMM_RPN_PM_DATA; | |
1344 | } | |
1345 | } | |
3a5e903c | 1346 | |
1da177e4 LT |
1347 | if (rpn->param_mask & RFCOMM_RPN_PM_STOP) { |
1348 | stop_bits = __get_rpn_stop_bits(rpn->line_settings); | |
1349 | if (stop_bits != RFCOMM_RPN_STOP_1) { | |
1350 | BT_DBG("RPN stop bits mismatch 0x%x", stop_bits); | |
1351 | stop_bits = RFCOMM_RPN_STOP_1; | |
1352 | rpn_mask ^= RFCOMM_RPN_PM_STOP; | |
1353 | } | |
1354 | } | |
3a5e903c | 1355 | |
1da177e4 LT |
1356 | if (rpn->param_mask & RFCOMM_RPN_PM_PARITY) { |
1357 | parity = __get_rpn_parity(rpn->line_settings); | |
1358 | if (parity != RFCOMM_RPN_PARITY_NONE) { | |
1359 | BT_DBG("RPN parity mismatch 0x%x", parity); | |
1360 | parity = RFCOMM_RPN_PARITY_NONE; | |
1361 | rpn_mask ^= RFCOMM_RPN_PM_PARITY; | |
1362 | } | |
1363 | } | |
3a5e903c | 1364 | |
1da177e4 LT |
1365 | if (rpn->param_mask & RFCOMM_RPN_PM_FLOW) { |
1366 | flow_ctrl = rpn->flow_ctrl; | |
1367 | if (flow_ctrl != RFCOMM_RPN_FLOW_NONE) { | |
1368 | BT_DBG("RPN flow ctrl mismatch 0x%x", flow_ctrl); | |
1369 | flow_ctrl = RFCOMM_RPN_FLOW_NONE; | |
1370 | rpn_mask ^= RFCOMM_RPN_PM_FLOW; | |
1371 | } | |
1372 | } | |
3a5e903c | 1373 | |
1da177e4 LT |
1374 | if (rpn->param_mask & RFCOMM_RPN_PM_XON) { |
1375 | xon_char = rpn->xon_char; | |
1376 | if (xon_char != RFCOMM_RPN_XON_CHAR) { | |
1377 | BT_DBG("RPN XON char mismatch 0x%x", xon_char); | |
1378 | xon_char = RFCOMM_RPN_XON_CHAR; | |
1379 | rpn_mask ^= RFCOMM_RPN_PM_XON; | |
1380 | } | |
1381 | } | |
3a5e903c | 1382 | |
1da177e4 LT |
1383 | if (rpn->param_mask & RFCOMM_RPN_PM_XOFF) { |
1384 | xoff_char = rpn->xoff_char; | |
1385 | if (xoff_char != RFCOMM_RPN_XOFF_CHAR) { | |
1386 | BT_DBG("RPN XOFF char mismatch 0x%x", xoff_char); | |
1387 | xoff_char = RFCOMM_RPN_XOFF_CHAR; | |
1388 | rpn_mask ^= RFCOMM_RPN_PM_XOFF; | |
1389 | } | |
1390 | } | |
1391 | ||
1392 | rpn_out: | |
3a5e903c S |
1393 | rfcomm_send_rpn(s, 0, dlci, bit_rate, data_bits, stop_bits, |
1394 | parity, flow_ctrl, xon_char, xoff_char, rpn_mask); | |
1da177e4 LT |
1395 | |
1396 | return 0; | |
1397 | } | |
1398 | ||
1399 | static int rfcomm_recv_rls(struct rfcomm_session *s, int cr, struct sk_buff *skb) | |
1400 | { | |
1401 | struct rfcomm_rls *rls = (void *) skb->data; | |
1402 | u8 dlci = __get_dlci(rls->dlci); | |
1403 | ||
1404 | BT_DBG("dlci %d cr %d status 0x%x", dlci, cr, rls->status); | |
3a5e903c | 1405 | |
1da177e4 LT |
1406 | if (!cr) |
1407 | return 0; | |
1408 | ||
3a5e903c S |
1409 | /* We should probably do something with this information here. But |
1410 | * for now it's sufficient just to reply -- Bluetooth 1.1 says it's | |
1411 | * mandatory to recognise and respond to RLS */ | |
1da177e4 LT |
1412 | |
1413 | rfcomm_send_rls(s, 0, dlci, rls->status); | |
1414 | ||
1415 | return 0; | |
1416 | } | |
1417 | ||
1418 | static int rfcomm_recv_msc(struct rfcomm_session *s, int cr, struct sk_buff *skb) | |
1419 | { | |
1420 | struct rfcomm_msc *msc = (void *) skb->data; | |
1421 | struct rfcomm_dlc *d; | |
1422 | u8 dlci = __get_dlci(msc->dlci); | |
1423 | ||
1424 | BT_DBG("dlci %d cr %d v24 0x%x", dlci, cr, msc->v24_sig); | |
1425 | ||
1426 | d = rfcomm_dlc_get(s, dlci); | |
3a5e903c | 1427 | if (!d) |
1da177e4 LT |
1428 | return 0; |
1429 | ||
1430 | if (cr) { | |
1431 | if (msc->v24_sig & RFCOMM_V24_FC && !d->cfc) | |
1432 | set_bit(RFCOMM_TX_THROTTLED, &d->flags); | |
1433 | else | |
1434 | clear_bit(RFCOMM_TX_THROTTLED, &d->flags); | |
3a5e903c | 1435 | |
1da177e4 LT |
1436 | rfcomm_dlc_lock(d); |
1437 | if (d->modem_status) | |
1438 | d->modem_status(d, msc->v24_sig); | |
1439 | rfcomm_dlc_unlock(d); | |
1440 | ||
1441 | rfcomm_send_msc(s, 0, dlci, msc->v24_sig); | |
1442 | ||
1443 | d->mscex |= RFCOMM_MSCEX_RX; | |
3a5e903c | 1444 | } else |
1da177e4 LT |
1445 | d->mscex |= RFCOMM_MSCEX_TX; |
1446 | ||
1447 | return 0; | |
1448 | } | |
1449 | ||
1450 | static int rfcomm_recv_mcc(struct rfcomm_session *s, struct sk_buff *skb) | |
1451 | { | |
1452 | struct rfcomm_mcc *mcc = (void *) skb->data; | |
1453 | u8 type, cr, len; | |
1454 | ||
1455 | cr = __test_cr(mcc->type); | |
1456 | type = __get_mcc_type(mcc->type); | |
1457 | len = __get_mcc_len(mcc->len); | |
1458 | ||
1459 | BT_DBG("%p type 0x%x cr %d", s, type, cr); | |
1460 | ||
1461 | skb_pull(skb, 2); | |
1462 | ||
1463 | switch (type) { | |
1464 | case RFCOMM_PN: | |
1465 | rfcomm_recv_pn(s, cr, skb); | |
1466 | break; | |
1467 | ||
1468 | case RFCOMM_RPN: | |
1469 | rfcomm_recv_rpn(s, cr, len, skb); | |
1470 | break; | |
1471 | ||
1472 | case RFCOMM_RLS: | |
1473 | rfcomm_recv_rls(s, cr, skb); | |
1474 | break; | |
1475 | ||
1476 | case RFCOMM_MSC: | |
1477 | rfcomm_recv_msc(s, cr, skb); | |
1478 | break; | |
1479 | ||
1480 | case RFCOMM_FCOFF: | |
1481 | if (cr) { | |
1482 | set_bit(RFCOMM_TX_THROTTLED, &s->flags); | |
1483 | rfcomm_send_fcoff(s, 0); | |
1484 | } | |
1485 | break; | |
1486 | ||
1487 | case RFCOMM_FCON: | |
1488 | if (cr) { | |
1489 | clear_bit(RFCOMM_TX_THROTTLED, &s->flags); | |
1490 | rfcomm_send_fcon(s, 0); | |
1491 | } | |
1492 | break; | |
1493 | ||
1494 | case RFCOMM_TEST: | |
1495 | if (cr) | |
1496 | rfcomm_send_test(s, 0, skb->data, skb->len); | |
1497 | break; | |
1498 | ||
1499 | case RFCOMM_NSC: | |
1500 | break; | |
1501 | ||
1502 | default: | |
1503 | BT_ERR("Unknown control type 0x%02x", type); | |
1504 | rfcomm_send_nsc(s, cr, type); | |
1505 | break; | |
1506 | } | |
1507 | return 0; | |
1508 | } | |
1509 | ||
1510 | static int rfcomm_recv_data(struct rfcomm_session *s, u8 dlci, int pf, struct sk_buff *skb) | |
1511 | { | |
1512 | struct rfcomm_dlc *d; | |
1513 | ||
1514 | BT_DBG("session %p state %ld dlci %d pf %d", s, s->state, dlci, pf); | |
1515 | ||
1516 | d = rfcomm_dlc_get(s, dlci); | |
1517 | if (!d) { | |
1518 | rfcomm_send_dm(s, dlci); | |
1519 | goto drop; | |
1520 | } | |
1521 | ||
1522 | if (pf && d->cfc) { | |
1523 | u8 credits = *(u8 *) skb->data; skb_pull(skb, 1); | |
1524 | ||
1525 | d->tx_credits += credits; | |
1526 | if (d->tx_credits) | |
1527 | clear_bit(RFCOMM_TX_THROTTLED, &d->flags); | |
1528 | } | |
1529 | ||
1530 | if (skb->len && d->state == BT_CONNECTED) { | |
1531 | rfcomm_dlc_lock(d); | |
1532 | d->rx_credits--; | |
1533 | d->data_ready(d, skb); | |
1534 | rfcomm_dlc_unlock(d); | |
1535 | return 0; | |
1536 | } | |
1537 | ||
1538 | drop: | |
1539 | kfree_skb(skb); | |
1540 | return 0; | |
1541 | } | |
1542 | ||
1543 | static int rfcomm_recv_frame(struct rfcomm_session *s, struct sk_buff *skb) | |
1544 | { | |
1545 | struct rfcomm_hdr *hdr = (void *) skb->data; | |
1546 | u8 type, dlci, fcs; | |
1547 | ||
1548 | dlci = __get_dlci(hdr->addr); | |
1549 | type = __get_type(hdr->ctrl); | |
1550 | ||
1551 | /* Trim FCS */ | |
1552 | skb->len--; skb->tail--; | |
1553 | fcs = *(u8 *) skb->tail; | |
1554 | ||
1555 | if (__check_fcs(skb->data, type, fcs)) { | |
1556 | BT_ERR("bad checksum in packet"); | |
1557 | kfree_skb(skb); | |
1558 | return -EILSEQ; | |
1559 | } | |
1560 | ||
1561 | if (__test_ea(hdr->len)) | |
1562 | skb_pull(skb, 3); | |
1563 | else | |
1564 | skb_pull(skb, 4); | |
1565 | ||
1566 | switch (type) { | |
1567 | case RFCOMM_SABM: | |
1568 | if (__test_pf(hdr->ctrl)) | |
1569 | rfcomm_recv_sabm(s, dlci); | |
1570 | break; | |
1571 | ||
1572 | case RFCOMM_DISC: | |
1573 | if (__test_pf(hdr->ctrl)) | |
1574 | rfcomm_recv_disc(s, dlci); | |
1575 | break; | |
1576 | ||
1577 | case RFCOMM_UA: | |
1578 | if (__test_pf(hdr->ctrl)) | |
1579 | rfcomm_recv_ua(s, dlci); | |
1580 | break; | |
1581 | ||
1582 | case RFCOMM_DM: | |
1583 | rfcomm_recv_dm(s, dlci); | |
1584 | break; | |
1585 | ||
1586 | case RFCOMM_UIH: | |
1587 | if (dlci) | |
1588 | return rfcomm_recv_data(s, dlci, __test_pf(hdr->ctrl), skb); | |
1589 | ||
1590 | rfcomm_recv_mcc(s, skb); | |
1591 | break; | |
1592 | ||
1593 | default: | |
1594 | BT_ERR("Unknown packet type 0x%02x\n", type); | |
1595 | break; | |
1596 | } | |
1597 | kfree_skb(skb); | |
1598 | return 0; | |
1599 | } | |
1600 | ||
1601 | /* ---- Connection and data processing ---- */ | |
1602 | ||
1603 | static void rfcomm_process_connect(struct rfcomm_session *s) | |
1604 | { | |
1605 | struct rfcomm_dlc *d; | |
1606 | struct list_head *p, *n; | |
1607 | ||
1608 | BT_DBG("session %p state %ld", s, s->state); | |
1609 | ||
1610 | list_for_each_safe(p, n, &s->dlcs) { | |
1611 | d = list_entry(p, struct rfcomm_dlc, list); | |
1612 | if (d->state == BT_CONFIG) { | |
1613 | d->mtu = s->mtu; | |
1614 | rfcomm_send_pn(s, 1, d); | |
1615 | } | |
1616 | } | |
1617 | } | |
1618 | ||
1619 | /* Send data queued for the DLC. | |
1620 | * Return number of frames left in the queue. | |
1621 | */ | |
1622 | static inline int rfcomm_process_tx(struct rfcomm_dlc *d) | |
1623 | { | |
1624 | struct sk_buff *skb; | |
1625 | int err; | |
1626 | ||
1627 | BT_DBG("dlc %p state %ld cfc %d rx_credits %d tx_credits %d", | |
1628 | d, d->state, d->cfc, d->rx_credits, d->tx_credits); | |
1629 | ||
1630 | /* Send pending MSC */ | |
1631 | if (test_and_clear_bit(RFCOMM_MSC_PENDING, &d->flags)) | |
1632 | rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig); | |
1633 | ||
1634 | if (d->cfc) { | |
1635 | /* CFC enabled. | |
1636 | * Give them some credits */ | |
1637 | if (!test_bit(RFCOMM_RX_THROTTLED, &d->flags) && | |
1638 | d->rx_credits <= (d->cfc >> 2)) { | |
1639 | rfcomm_send_credits(d->session, d->addr, d->cfc - d->rx_credits); | |
1640 | d->rx_credits = d->cfc; | |
1641 | } | |
1642 | } else { | |
1643 | /* CFC disabled. | |
1644 | * Give ourselves some credits */ | |
1645 | d->tx_credits = 5; | |
1646 | } | |
1647 | ||
1648 | if (test_bit(RFCOMM_TX_THROTTLED, &d->flags)) | |
1649 | return skb_queue_len(&d->tx_queue); | |
1650 | ||
1651 | while (d->tx_credits && (skb = skb_dequeue(&d->tx_queue))) { | |
1652 | err = rfcomm_send_frame(d->session, skb->data, skb->len); | |
1653 | if (err < 0) { | |
1654 | skb_queue_head(&d->tx_queue, skb); | |
1655 | break; | |
1656 | } | |
1657 | kfree_skb(skb); | |
1658 | d->tx_credits--; | |
1659 | } | |
1660 | ||
1661 | if (d->cfc && !d->tx_credits) { | |
1662 | /* We're out of TX credits. | |
1663 | * Set TX_THROTTLED flag to avoid unnesary wakeups by dlc_send. */ | |
1664 | set_bit(RFCOMM_TX_THROTTLED, &d->flags); | |
1665 | } | |
1666 | ||
1667 | return skb_queue_len(&d->tx_queue); | |
1668 | } | |
1669 | ||
1670 | static inline void rfcomm_process_dlcs(struct rfcomm_session *s) | |
1671 | { | |
1672 | struct rfcomm_dlc *d; | |
1673 | struct list_head *p, *n; | |
1674 | ||
1675 | BT_DBG("session %p state %ld", s, s->state); | |
1676 | ||
1677 | list_for_each_safe(p, n, &s->dlcs) { | |
1678 | d = list_entry(p, struct rfcomm_dlc, list); | |
1679 | ||
1680 | if (test_bit(RFCOMM_TIMED_OUT, &d->flags)) { | |
1681 | __rfcomm_dlc_close(d, ETIMEDOUT); | |
1682 | continue; | |
1683 | } | |
1684 | ||
1685 | if (test_and_clear_bit(RFCOMM_AUTH_ACCEPT, &d->flags)) { | |
1686 | rfcomm_dlc_clear_timer(d); | |
1687 | rfcomm_dlc_accept(d); | |
1688 | if (d->link_mode & RFCOMM_LM_SECURE) { | |
1689 | struct sock *sk = s->sock->sk; | |
1690 | hci_conn_change_link_key(l2cap_pi(sk)->conn->hcon); | |
1691 | } | |
1692 | continue; | |
1693 | } else if (test_and_clear_bit(RFCOMM_AUTH_REJECT, &d->flags)) { | |
1694 | rfcomm_dlc_clear_timer(d); | |
1695 | rfcomm_send_dm(s, d->dlci); | |
1696 | __rfcomm_dlc_close(d, ECONNREFUSED); | |
1697 | continue; | |
1698 | } | |
1699 | ||
1700 | if (test_bit(RFCOMM_TX_THROTTLED, &s->flags)) | |
1701 | continue; | |
1702 | ||
1703 | if ((d->state == BT_CONNECTED || d->state == BT_DISCONN) && | |
1704 | d->mscex == RFCOMM_MSCEX_OK) | |
1705 | rfcomm_process_tx(d); | |
1706 | } | |
1707 | } | |
1708 | ||
1709 | static inline void rfcomm_process_rx(struct rfcomm_session *s) | |
1710 | { | |
1711 | struct socket *sock = s->sock; | |
1712 | struct sock *sk = sock->sk; | |
1713 | struct sk_buff *skb; | |
1714 | ||
1715 | BT_DBG("session %p state %ld qlen %d", s, s->state, skb_queue_len(&sk->sk_receive_queue)); | |
1716 | ||
1717 | /* Get data directly from socket receive queue without copying it. */ | |
1718 | while ((skb = skb_dequeue(&sk->sk_receive_queue))) { | |
1719 | skb_orphan(skb); | |
1720 | rfcomm_recv_frame(s, skb); | |
1721 | } | |
1722 | ||
1723 | if (sk->sk_state == BT_CLOSED) { | |
1724 | if (!s->initiator) | |
1725 | rfcomm_session_put(s); | |
1726 | ||
1727 | rfcomm_session_close(s, sk->sk_err); | |
1728 | } | |
1729 | } | |
1730 | ||
1731 | static inline void rfcomm_accept_connection(struct rfcomm_session *s) | |
1732 | { | |
1733 | struct socket *sock = s->sock, *nsock; | |
1734 | int err; | |
1735 | ||
1736 | /* Fast check for a new connection. | |
1737 | * Avoids unnesesary socket allocations. */ | |
1738 | if (list_empty(&bt_sk(sock->sk)->accept_q)) | |
1739 | return; | |
1740 | ||
1741 | BT_DBG("session %p", s); | |
1742 | ||
1743 | if (sock_create_lite(PF_BLUETOOTH, sock->type, BTPROTO_L2CAP, &nsock)) | |
1744 | return; | |
1745 | ||
1746 | nsock->ops = sock->ops; | |
1747 | ||
1748 | __module_get(nsock->ops->owner); | |
1749 | ||
1750 | err = sock->ops->accept(sock, nsock, O_NONBLOCK); | |
1751 | if (err < 0) { | |
1752 | sock_release(nsock); | |
1753 | return; | |
1754 | } | |
1755 | ||
1756 | /* Set our callbacks */ | |
1757 | nsock->sk->sk_data_ready = rfcomm_l2data_ready; | |
1758 | nsock->sk->sk_state_change = rfcomm_l2state_change; | |
1759 | ||
1760 | s = rfcomm_session_add(nsock, BT_OPEN); | |
1761 | if (s) { | |
1762 | rfcomm_session_hold(s); | |
1763 | rfcomm_schedule(RFCOMM_SCHED_RX); | |
1764 | } else | |
1765 | sock_release(nsock); | |
1766 | } | |
1767 | ||
1768 | static inline void rfcomm_check_connection(struct rfcomm_session *s) | |
1769 | { | |
1770 | struct sock *sk = s->sock->sk; | |
1771 | ||
1772 | BT_DBG("%p state %ld", s, s->state); | |
1773 | ||
1774 | switch(sk->sk_state) { | |
1775 | case BT_CONNECTED: | |
1776 | s->state = BT_CONNECT; | |
1777 | ||
1778 | /* We can adjust MTU on outgoing sessions. | |
1779 | * L2CAP MTU minus UIH header and FCS. */ | |
1780 | s->mtu = min(l2cap_pi(sk)->omtu, l2cap_pi(sk)->imtu) - 5; | |
1781 | ||
1782 | rfcomm_send_sabm(s, 0); | |
1783 | break; | |
1784 | ||
1785 | case BT_CLOSED: | |
1786 | s->state = BT_CLOSED; | |
1787 | rfcomm_session_close(s, sk->sk_err); | |
1788 | break; | |
1789 | } | |
1790 | } | |
1791 | ||
1792 | static inline void rfcomm_process_sessions(void) | |
1793 | { | |
1794 | struct list_head *p, *n; | |
1795 | ||
1796 | rfcomm_lock(); | |
1797 | ||
1798 | list_for_each_safe(p, n, &session_list) { | |
1799 | struct rfcomm_session *s; | |
1800 | s = list_entry(p, struct rfcomm_session, list); | |
1801 | ||
1802 | if (s->state == BT_LISTEN) { | |
1803 | rfcomm_accept_connection(s); | |
1804 | continue; | |
1805 | } | |
1806 | ||
1807 | rfcomm_session_hold(s); | |
1808 | ||
1809 | switch (s->state) { | |
1810 | case BT_BOUND: | |
1811 | rfcomm_check_connection(s); | |
1812 | break; | |
1813 | ||
1814 | default: | |
1815 | rfcomm_process_rx(s); | |
1816 | break; | |
1817 | } | |
1818 | ||
1819 | rfcomm_process_dlcs(s); | |
1820 | ||
1821 | rfcomm_session_put(s); | |
1822 | } | |
1823 | ||
1824 | rfcomm_unlock(); | |
1825 | } | |
1826 | ||
1827 | static void rfcomm_worker(void) | |
1828 | { | |
1829 | BT_DBG(""); | |
1830 | ||
1831 | while (!atomic_read(&terminate)) { | |
1832 | if (!test_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event)) { | |
1833 | /* No pending events. Let's sleep. | |
1834 | * Incoming connections and data will wake us up. */ | |
1835 | set_current_state(TASK_INTERRUPTIBLE); | |
1836 | schedule(); | |
1837 | } | |
1838 | ||
1839 | /* Process stuff */ | |
1840 | clear_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event); | |
1841 | rfcomm_process_sessions(); | |
1842 | } | |
1843 | set_current_state(TASK_RUNNING); | |
1844 | return; | |
1845 | } | |
1846 | ||
1847 | static int rfcomm_add_listener(bdaddr_t *ba) | |
1848 | { | |
1849 | struct sockaddr_l2 addr; | |
1850 | struct socket *sock; | |
1851 | struct sock *sk; | |
1852 | struct rfcomm_session *s; | |
1853 | int err = 0; | |
1854 | ||
1855 | /* Create socket */ | |
1856 | err = rfcomm_l2sock_create(&sock); | |
1857 | if (err < 0) { | |
1858 | BT_ERR("Create socket failed %d", err); | |
1859 | return err; | |
1860 | } | |
1861 | ||
1862 | /* Bind socket */ | |
1863 | bacpy(&addr.l2_bdaddr, ba); | |
1864 | addr.l2_family = AF_BLUETOOTH; | |
1865 | addr.l2_psm = htobs(RFCOMM_PSM); | |
1866 | err = sock->ops->bind(sock, (struct sockaddr *) &addr, sizeof(addr)); | |
1867 | if (err < 0) { | |
1868 | BT_ERR("Bind failed %d", err); | |
1869 | goto failed; | |
1870 | } | |
1871 | ||
1872 | /* Set L2CAP options */ | |
1873 | sk = sock->sk; | |
1874 | lock_sock(sk); | |
56f3a40a | 1875 | l2cap_pi(sk)->imtu = l2cap_mtu; |
1da177e4 LT |
1876 | release_sock(sk); |
1877 | ||
1878 | /* Start listening on the socket */ | |
1879 | err = sock->ops->listen(sock, 10); | |
1880 | if (err) { | |
1881 | BT_ERR("Listen failed %d", err); | |
1882 | goto failed; | |
1883 | } | |
1884 | ||
1885 | /* Add listening session */ | |
1886 | s = rfcomm_session_add(sock, BT_LISTEN); | |
1887 | if (!s) | |
1888 | goto failed; | |
1889 | ||
1890 | rfcomm_session_hold(s); | |
1891 | return 0; | |
1892 | failed: | |
1893 | sock_release(sock); | |
1894 | return err; | |
1895 | } | |
1896 | ||
1897 | static void rfcomm_kill_listener(void) | |
1898 | { | |
1899 | struct rfcomm_session *s; | |
1900 | struct list_head *p, *n; | |
1901 | ||
1902 | BT_DBG(""); | |
1903 | ||
1904 | list_for_each_safe(p, n, &session_list) { | |
1905 | s = list_entry(p, struct rfcomm_session, list); | |
1906 | rfcomm_session_del(s); | |
1907 | } | |
1908 | } | |
1909 | ||
1910 | static int rfcomm_run(void *unused) | |
1911 | { | |
1912 | rfcomm_thread = current; | |
1913 | ||
1914 | atomic_inc(&running); | |
1915 | ||
1916 | daemonize("krfcommd"); | |
1917 | set_user_nice(current, -10); | |
1918 | current->flags |= PF_NOFREEZE; | |
1919 | ||
1920 | BT_DBG(""); | |
1921 | ||
1922 | rfcomm_add_listener(BDADDR_ANY); | |
1923 | ||
1924 | rfcomm_worker(); | |
1925 | ||
1926 | rfcomm_kill_listener(); | |
1927 | ||
1928 | atomic_dec(&running); | |
1929 | return 0; | |
1930 | } | |
1931 | ||
1932 | static void rfcomm_auth_cfm(struct hci_conn *conn, u8 status) | |
1933 | { | |
1934 | struct rfcomm_session *s; | |
1935 | struct rfcomm_dlc *d; | |
1936 | struct list_head *p, *n; | |
1937 | ||
1938 | BT_DBG("conn %p status 0x%02x", conn, status); | |
1939 | ||
1940 | s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst); | |
1941 | if (!s) | |
1942 | return; | |
1943 | ||
1944 | rfcomm_session_hold(s); | |
1945 | ||
1946 | list_for_each_safe(p, n, &s->dlcs) { | |
1947 | d = list_entry(p, struct rfcomm_dlc, list); | |
1948 | ||
1949 | if (d->link_mode & (RFCOMM_LM_ENCRYPT | RFCOMM_LM_SECURE)) | |
1950 | continue; | |
1951 | ||
1952 | if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags)) | |
1953 | continue; | |
1954 | ||
1955 | if (!status) | |
1956 | set_bit(RFCOMM_AUTH_ACCEPT, &d->flags); | |
1957 | else | |
1958 | set_bit(RFCOMM_AUTH_REJECT, &d->flags); | |
1959 | } | |
1960 | ||
1961 | rfcomm_session_put(s); | |
1962 | ||
1963 | rfcomm_schedule(RFCOMM_SCHED_AUTH); | |
1964 | } | |
1965 | ||
1966 | static void rfcomm_encrypt_cfm(struct hci_conn *conn, u8 status, u8 encrypt) | |
1967 | { | |
1968 | struct rfcomm_session *s; | |
1969 | struct rfcomm_dlc *d; | |
1970 | struct list_head *p, *n; | |
1971 | ||
1972 | BT_DBG("conn %p status 0x%02x encrypt 0x%02x", conn, status, encrypt); | |
1973 | ||
1974 | s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst); | |
1975 | if (!s) | |
1976 | return; | |
1977 | ||
1978 | rfcomm_session_hold(s); | |
1979 | ||
1980 | list_for_each_safe(p, n, &s->dlcs) { | |
1981 | d = list_entry(p, struct rfcomm_dlc, list); | |
1982 | ||
1983 | if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags)) | |
1984 | continue; | |
1985 | ||
1986 | if (!status && encrypt) | |
1987 | set_bit(RFCOMM_AUTH_ACCEPT, &d->flags); | |
1988 | else | |
1989 | set_bit(RFCOMM_AUTH_REJECT, &d->flags); | |
1990 | } | |
1991 | ||
1992 | rfcomm_session_put(s); | |
1993 | ||
1994 | rfcomm_schedule(RFCOMM_SCHED_AUTH); | |
1995 | } | |
1996 | ||
1997 | static struct hci_cb rfcomm_cb = { | |
1998 | .name = "RFCOMM", | |
1999 | .auth_cfm = rfcomm_auth_cfm, | |
2000 | .encrypt_cfm = rfcomm_encrypt_cfm | |
2001 | }; | |
2002 | ||
be9d1227 | 2003 | static ssize_t rfcomm_dlc_sysfs_show(struct class *dev, char *buf) |
1da177e4 LT |
2004 | { |
2005 | struct rfcomm_session *s; | |
2006 | struct list_head *pp, *p; | |
be9d1227 | 2007 | char *str = buf; |
1da177e4 LT |
2008 | |
2009 | rfcomm_lock(); | |
2010 | ||
2011 | list_for_each(p, &session_list) { | |
2012 | s = list_entry(p, struct rfcomm_session, list); | |
be9d1227 MH |
2013 | list_for_each(pp, &s->dlcs) { |
2014 | struct sock *sk = s->sock->sk; | |
2015 | struct rfcomm_dlc *d = list_entry(pp, struct rfcomm_dlc, list); | |
1da177e4 | 2016 | |
be9d1227 MH |
2017 | str += sprintf(str, "%s %s %ld %d %d %d %d\n", |
2018 | batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst), | |
2019 | d->state, d->dlci, d->mtu, d->rx_credits, d->tx_credits); | |
1da177e4 LT |
2020 | } |
2021 | } | |
1da177e4 | 2022 | |
1da177e4 | 2023 | rfcomm_unlock(); |
1da177e4 | 2024 | |
be9d1227 | 2025 | return (str - buf); |
1da177e4 LT |
2026 | } |
2027 | ||
be9d1227 | 2028 | static CLASS_ATTR(rfcomm_dlc, S_IRUGO, rfcomm_dlc_sysfs_show, NULL); |
1da177e4 LT |
2029 | |
2030 | /* ---- Initialization ---- */ | |
2031 | static int __init rfcomm_init(void) | |
2032 | { | |
2033 | l2cap_load(); | |
2034 | ||
2035 | hci_register_cb(&rfcomm_cb); | |
2036 | ||
2037 | kernel_thread(rfcomm_run, NULL, CLONE_KERNEL); | |
2038 | ||
be9d1227 | 2039 | class_create_file(&bt_class, &class_attr_rfcomm_dlc); |
1da177e4 LT |
2040 | |
2041 | rfcomm_init_sockets(); | |
2042 | ||
2043 | #ifdef CONFIG_BT_RFCOMM_TTY | |
2044 | rfcomm_init_ttys(); | |
2045 | #endif | |
2046 | ||
be9d1227 MH |
2047 | BT_INFO("RFCOMM ver %s", VERSION); |
2048 | ||
1da177e4 LT |
2049 | return 0; |
2050 | } | |
2051 | ||
2052 | static void __exit rfcomm_exit(void) | |
2053 | { | |
be9d1227 MH |
2054 | class_remove_file(&bt_class, &class_attr_rfcomm_dlc); |
2055 | ||
1da177e4 LT |
2056 | hci_unregister_cb(&rfcomm_cb); |
2057 | ||
2058 | /* Terminate working thread. | |
2059 | * ie. Set terminate flag and wake it up */ | |
2060 | atomic_inc(&terminate); | |
2061 | rfcomm_schedule(RFCOMM_SCHED_STATE); | |
2062 | ||
2063 | /* Wait until thread is running */ | |
2064 | while (atomic_read(&running)) | |
2065 | schedule(); | |
2066 | ||
2067 | #ifdef CONFIG_BT_RFCOMM_TTY | |
2068 | rfcomm_cleanup_ttys(); | |
2069 | #endif | |
2070 | ||
2071 | rfcomm_cleanup_sockets(); | |
1da177e4 LT |
2072 | } |
2073 | ||
2074 | module_init(rfcomm_init); | |
2075 | module_exit(rfcomm_exit); | |
2076 | ||
56f3a40a MH |
2077 | module_param(l2cap_mtu, uint, 0644); |
2078 | MODULE_PARM_DESC(l2cap_mtu, "Default MTU for the L2CAP connection"); | |
2079 | ||
1da177e4 LT |
2080 | MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>"); |
2081 | MODULE_DESCRIPTION("Bluetooth RFCOMM ver " VERSION); | |
2082 | MODULE_VERSION(VERSION); | |
2083 | MODULE_LICENSE("GPL"); | |
2084 | MODULE_ALIAS("bt-proto-3"); |