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 /* 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/module.h> 31 #include <linux/errno.h> 32 #include <linux/kernel.h> 33 #include <linux/sched.h> 34 #include <linux/signal.h> 35 #include <linux/init.h> 36 #include <linux/wait.h> 37 #include <linux/device.h> 38 #include <linux/net.h> 39 #include <linux/mutex.h> 40 41 #include <net/sock.h> 42 #include <asm/uaccess.h> 43 #include <asm/unaligned.h> 44 45 #include <net/bluetooth/bluetooth.h> 46 #include <net/bluetooth/hci_core.h> 47 #include <net/bluetooth/l2cap.h> 48 #include <net/bluetooth/rfcomm.h> 49 50 #ifndef CONFIG_BT_RFCOMM_DEBUG 51 #undef BT_DBG 52 #define BT_DBG(D...) 53 #endif 54 55 #define VERSION "1.8" 56 57 static int disable_cfc = 0; 58 static int channel_mtu = -1; 59 static unsigned int l2cap_mtu = RFCOMM_MAX_L2CAP_MTU; 60 61 static struct task_struct *rfcomm_thread; 62 63 static DEFINE_MUTEX(rfcomm_mutex); 64 #define rfcomm_lock() mutex_lock(&rfcomm_mutex) 65 #define rfcomm_unlock() mutex_unlock(&rfcomm_mutex) 66 67 static unsigned long rfcomm_event; 68 69 static LIST_HEAD(session_list); 70 static atomic_t terminate, running; 71 72 static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len); 73 static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci); 74 static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci); 75 static int rfcomm_queue_disc(struct rfcomm_dlc *d); 76 static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type); 77 static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d); 78 static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig); 79 static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len); 80 static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits); 81 static void rfcomm_make_uih(struct sk_buff *skb, u8 addr); 82 83 static void rfcomm_process_connect(struct rfcomm_session *s); 84 85 static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src, bdaddr_t *dst, int *err); 86 static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst); 87 static void rfcomm_session_del(struct rfcomm_session *s); 88 89 /* ---- RFCOMM frame parsing macros ---- */ 90 #define __get_dlci(b) ((b & 0xfc) >> 2) 91 #define __get_channel(b) ((b & 0xf8) >> 3) 92 #define __get_dir(b) ((b & 0x04) >> 2) 93 #define __get_type(b) ((b & 0xef)) 94 95 #define __test_ea(b) ((b & 0x01)) 96 #define __test_cr(b) ((b & 0x02)) 97 #define __test_pf(b) ((b & 0x10)) 98 99 #define __addr(cr, dlci) (((dlci & 0x3f) << 2) | (cr << 1) | 0x01) 100 #define __ctrl(type, pf) (((type & 0xef) | (pf << 4))) 101 #define __dlci(dir, chn) (((chn & 0x1f) << 1) | dir) 102 #define __srv_channel(dlci) (dlci >> 1) 103 #define __dir(dlci) (dlci & 0x01) 104 105 #define __len8(len) (((len) << 1) | 1) 106 #define __len16(len) ((len) << 1) 107 108 /* MCC macros */ 109 #define __mcc_type(cr, type) (((type << 2) | (cr << 1) | 0x01)) 110 #define __get_mcc_type(b) ((b & 0xfc) >> 2) 111 #define __get_mcc_len(b) ((b & 0xfe) >> 1) 112 113 /* RPN macros */ 114 #define __rpn_line_settings(data, stop, parity) ((data & 0x3) | ((stop & 0x1) << 2) | ((parity & 0x7) << 3)) 115 #define __get_rpn_data_bits(line) ((line) & 0x3) 116 #define __get_rpn_stop_bits(line) (((line) >> 2) & 0x1) 117 #define __get_rpn_parity(line) (((line) >> 3) & 0x7) 118 119 static inline void rfcomm_schedule(uint event) 120 { 121 if (!rfcomm_thread) 122 return; 123 //set_bit(event, &rfcomm_event); 124 set_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event); 125 wake_up_process(rfcomm_thread); 126 } 127 128 static inline void rfcomm_session_put(struct rfcomm_session *s) 129 { 130 if (atomic_dec_and_test(&s->refcnt)) 131 rfcomm_session_del(s); 132 } 133 134 /* ---- RFCOMM FCS computation ---- */ 135 136 /* reversed, 8-bit, poly=0x07 */ 137 static unsigned char rfcomm_crc_table[256] = { 138 0x00, 0x91, 0xe3, 0x72, 0x07, 0x96, 0xe4, 0x75, 139 0x0e, 0x9f, 0xed, 0x7c, 0x09, 0x98, 0xea, 0x7b, 140 0x1c, 0x8d, 0xff, 0x6e, 0x1b, 0x8a, 0xf8, 0x69, 141 0x12, 0x83, 0xf1, 0x60, 0x15, 0x84, 0xf6, 0x67, 142 143 0x38, 0xa9, 0xdb, 0x4a, 0x3f, 0xae, 0xdc, 0x4d, 144 0x36, 0xa7, 0xd5, 0x44, 0x31, 0xa0, 0xd2, 0x43, 145 0x24, 0xb5, 0xc7, 0x56, 0x23, 0xb2, 0xc0, 0x51, 146 0x2a, 0xbb, 0xc9, 0x58, 0x2d, 0xbc, 0xce, 0x5f, 147 148 0x70, 0xe1, 0x93, 0x02, 0x77, 0xe6, 0x94, 0x05, 149 0x7e, 0xef, 0x9d, 0x0c, 0x79, 0xe8, 0x9a, 0x0b, 150 0x6c, 0xfd, 0x8f, 0x1e, 0x6b, 0xfa, 0x88, 0x19, 151 0x62, 0xf3, 0x81, 0x10, 0x65, 0xf4, 0x86, 0x17, 152 153 0x48, 0xd9, 0xab, 0x3a, 0x4f, 0xde, 0xac, 0x3d, 154 0x46, 0xd7, 0xa5, 0x34, 0x41, 0xd0, 0xa2, 0x33, 155 0x54, 0xc5, 0xb7, 0x26, 0x53, 0xc2, 0xb0, 0x21, 156 0x5a, 0xcb, 0xb9, 0x28, 0x5d, 0xcc, 0xbe, 0x2f, 157 158 0xe0, 0x71, 0x03, 0x92, 0xe7, 0x76, 0x04, 0x95, 159 0xee, 0x7f, 0x0d, 0x9c, 0xe9, 0x78, 0x0a, 0x9b, 160 0xfc, 0x6d, 0x1f, 0x8e, 0xfb, 0x6a, 0x18, 0x89, 161 0xf2, 0x63, 0x11, 0x80, 0xf5, 0x64, 0x16, 0x87, 162 163 0xd8, 0x49, 0x3b, 0xaa, 0xdf, 0x4e, 0x3c, 0xad, 164 0xd6, 0x47, 0x35, 0xa4, 0xd1, 0x40, 0x32, 0xa3, 165 0xc4, 0x55, 0x27, 0xb6, 0xc3, 0x52, 0x20, 0xb1, 166 0xca, 0x5b, 0x29, 0xb8, 0xcd, 0x5c, 0x2e, 0xbf, 167 168 0x90, 0x01, 0x73, 0xe2, 0x97, 0x06, 0x74, 0xe5, 169 0x9e, 0x0f, 0x7d, 0xec, 0x99, 0x08, 0x7a, 0xeb, 170 0x8c, 0x1d, 0x6f, 0xfe, 0x8b, 0x1a, 0x68, 0xf9, 171 0x82, 0x13, 0x61, 0xf0, 0x85, 0x14, 0x66, 0xf7, 172 173 0xa8, 0x39, 0x4b, 0xda, 0xaf, 0x3e, 0x4c, 0xdd, 174 0xa6, 0x37, 0x45, 0xd4, 0xa1, 0x30, 0x42, 0xd3, 175 0xb4, 0x25, 0x57, 0xc6, 0xb3, 0x22, 0x50, 0xc1, 176 0xba, 0x2b, 0x59, 0xc8, 0xbd, 0x2c, 0x5e, 0xcf 177 }; 178 179 /* CRC on 2 bytes */ 180 #define __crc(data) (rfcomm_crc_table[rfcomm_crc_table[0xff ^ data[0]] ^ data[1]]) 181 182 /* FCS on 2 bytes */ 183 static inline u8 __fcs(u8 *data) 184 { 185 return (0xff - __crc(data)); 186 } 187 188 /* FCS on 3 bytes */ 189 static inline u8 __fcs2(u8 *data) 190 { 191 return (0xff - rfcomm_crc_table[__crc(data) ^ data[2]]); 192 } 193 194 /* Check FCS */ 195 static inline int __check_fcs(u8 *data, int type, u8 fcs) 196 { 197 u8 f = __crc(data); 198 199 if (type != RFCOMM_UIH) 200 f = rfcomm_crc_table[f ^ data[2]]; 201 202 return rfcomm_crc_table[f ^ fcs] != 0xcf; 203 } 204 205 /* ---- L2CAP callbacks ---- */ 206 static void rfcomm_l2state_change(struct sock *sk) 207 { 208 BT_DBG("%p state %d", sk, sk->sk_state); 209 rfcomm_schedule(RFCOMM_SCHED_STATE); 210 } 211 212 static void rfcomm_l2data_ready(struct sock *sk, int bytes) 213 { 214 BT_DBG("%p bytes %d", sk, bytes); 215 rfcomm_schedule(RFCOMM_SCHED_RX); 216 } 217 218 static int rfcomm_l2sock_create(struct socket **sock) 219 { 220 int err; 221 222 BT_DBG(""); 223 224 err = sock_create_kern(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP, sock); 225 if (!err) { 226 struct sock *sk = (*sock)->sk; 227 sk->sk_data_ready = rfcomm_l2data_ready; 228 sk->sk_state_change = rfcomm_l2state_change; 229 } 230 return err; 231 } 232 233 /* ---- RFCOMM DLCs ---- */ 234 static void rfcomm_dlc_timeout(unsigned long arg) 235 { 236 struct rfcomm_dlc *d = (void *) arg; 237 238 BT_DBG("dlc %p state %ld", d, d->state); 239 240 set_bit(RFCOMM_TIMED_OUT, &d->flags); 241 rfcomm_dlc_put(d); 242 rfcomm_schedule(RFCOMM_SCHED_TIMEO); 243 } 244 245 static void rfcomm_dlc_set_timer(struct rfcomm_dlc *d, long timeout) 246 { 247 BT_DBG("dlc %p state %ld timeout %ld", d, d->state, timeout); 248 249 if (!mod_timer(&d->timer, jiffies + timeout)) 250 rfcomm_dlc_hold(d); 251 } 252 253 static void rfcomm_dlc_clear_timer(struct rfcomm_dlc *d) 254 { 255 BT_DBG("dlc %p state %ld", d, d->state); 256 257 if (timer_pending(&d->timer) && del_timer(&d->timer)) 258 rfcomm_dlc_put(d); 259 } 260 261 static void rfcomm_dlc_clear_state(struct rfcomm_dlc *d) 262 { 263 BT_DBG("%p", d); 264 265 d->state = BT_OPEN; 266 d->flags = 0; 267 d->mscex = 0; 268 d->mtu = RFCOMM_DEFAULT_MTU; 269 d->v24_sig = RFCOMM_V24_RTC | RFCOMM_V24_RTR | RFCOMM_V24_DV; 270 271 d->cfc = RFCOMM_CFC_DISABLED; 272 d->rx_credits = RFCOMM_DEFAULT_CREDITS; 273 } 274 275 struct rfcomm_dlc *rfcomm_dlc_alloc(gfp_t prio) 276 { 277 struct rfcomm_dlc *d = kzalloc(sizeof(*d), prio); 278 279 if (!d) 280 return NULL; 281 282 init_timer(&d->timer); 283 d->timer.function = rfcomm_dlc_timeout; 284 d->timer.data = (unsigned long) d; 285 286 skb_queue_head_init(&d->tx_queue); 287 spin_lock_init(&d->lock); 288 atomic_set(&d->refcnt, 1); 289 290 rfcomm_dlc_clear_state(d); 291 292 BT_DBG("%p", d); 293 294 return d; 295 } 296 297 void rfcomm_dlc_free(struct rfcomm_dlc *d) 298 { 299 BT_DBG("%p", d); 300 301 skb_queue_purge(&d->tx_queue); 302 kfree(d); 303 } 304 305 static void rfcomm_dlc_link(struct rfcomm_session *s, struct rfcomm_dlc *d) 306 { 307 BT_DBG("dlc %p session %p", d, s); 308 309 rfcomm_session_hold(s); 310 311 rfcomm_dlc_hold(d); 312 list_add(&d->list, &s->dlcs); 313 d->session = s; 314 } 315 316 static void rfcomm_dlc_unlink(struct rfcomm_dlc *d) 317 { 318 struct rfcomm_session *s = d->session; 319 320 BT_DBG("dlc %p refcnt %d session %p", d, atomic_read(&d->refcnt), s); 321 322 list_del(&d->list); 323 d->session = NULL; 324 rfcomm_dlc_put(d); 325 326 rfcomm_session_put(s); 327 } 328 329 static struct rfcomm_dlc *rfcomm_dlc_get(struct rfcomm_session *s, u8 dlci) 330 { 331 struct rfcomm_dlc *d; 332 struct list_head *p; 333 334 list_for_each(p, &s->dlcs) { 335 d = list_entry(p, struct rfcomm_dlc, list); 336 if (d->dlci == dlci) 337 return d; 338 } 339 return NULL; 340 } 341 342 static int __rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel) 343 { 344 struct rfcomm_session *s; 345 int err = 0; 346 u8 dlci; 347 348 BT_DBG("dlc %p state %ld %s %s channel %d", 349 d, d->state, batostr(src), batostr(dst), channel); 350 351 if (channel < 1 || channel > 30) 352 return -EINVAL; 353 354 if (d->state != BT_OPEN && d->state != BT_CLOSED) 355 return 0; 356 357 s = rfcomm_session_get(src, dst); 358 if (!s) { 359 s = rfcomm_session_create(src, dst, &err); 360 if (!s) 361 return err; 362 } 363 364 dlci = __dlci(!s->initiator, channel); 365 366 /* Check if DLCI already exists */ 367 if (rfcomm_dlc_get(s, dlci)) 368 return -EBUSY; 369 370 rfcomm_dlc_clear_state(d); 371 372 d->dlci = dlci; 373 d->addr = __addr(s->initiator, dlci); 374 d->priority = 7; 375 376 d->state = BT_CONFIG; 377 rfcomm_dlc_link(s, d); 378 379 d->mtu = s->mtu; 380 d->cfc = (s->cfc == RFCOMM_CFC_UNKNOWN) ? 0 : s->cfc; 381 382 if (s->state == BT_CONNECTED) 383 rfcomm_send_pn(s, 1, d); 384 rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT); 385 return 0; 386 } 387 388 int rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel) 389 { 390 int r; 391 392 rfcomm_lock(); 393 394 r = __rfcomm_dlc_open(d, src, dst, channel); 395 396 rfcomm_unlock(); 397 return r; 398 } 399 400 static int __rfcomm_dlc_close(struct rfcomm_dlc *d, int err) 401 { 402 struct rfcomm_session *s = d->session; 403 if (!s) 404 return 0; 405 406 BT_DBG("dlc %p state %ld dlci %d err %d session %p", 407 d, d->state, d->dlci, err, s); 408 409 switch (d->state) { 410 case BT_CONNECTED: 411 case BT_CONFIG: 412 case BT_CONNECT: 413 d->state = BT_DISCONN; 414 if (skb_queue_empty(&d->tx_queue)) { 415 rfcomm_send_disc(s, d->dlci); 416 rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT); 417 } else { 418 rfcomm_queue_disc(d); 419 rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT * 2); 420 } 421 break; 422 423 default: 424 rfcomm_dlc_clear_timer(d); 425 426 rfcomm_dlc_lock(d); 427 d->state = BT_CLOSED; 428 d->state_change(d, err); 429 rfcomm_dlc_unlock(d); 430 431 skb_queue_purge(&d->tx_queue); 432 rfcomm_dlc_unlink(d); 433 } 434 435 return 0; 436 } 437 438 int rfcomm_dlc_close(struct rfcomm_dlc *d, int err) 439 { 440 int r; 441 442 rfcomm_lock(); 443 444 r = __rfcomm_dlc_close(d, err); 445 446 rfcomm_unlock(); 447 return r; 448 } 449 450 int rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb) 451 { 452 int len = skb->len; 453 454 if (d->state != BT_CONNECTED) 455 return -ENOTCONN; 456 457 BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len); 458 459 if (len > d->mtu) 460 return -EINVAL; 461 462 rfcomm_make_uih(skb, d->addr); 463 skb_queue_tail(&d->tx_queue, skb); 464 465 if (!test_bit(RFCOMM_TX_THROTTLED, &d->flags)) 466 rfcomm_schedule(RFCOMM_SCHED_TX); 467 return len; 468 } 469 470 void fastcall __rfcomm_dlc_throttle(struct rfcomm_dlc *d) 471 { 472 BT_DBG("dlc %p state %ld", d, d->state); 473 474 if (!d->cfc) { 475 d->v24_sig |= RFCOMM_V24_FC; 476 set_bit(RFCOMM_MSC_PENDING, &d->flags); 477 } 478 rfcomm_schedule(RFCOMM_SCHED_TX); 479 } 480 481 void fastcall __rfcomm_dlc_unthrottle(struct rfcomm_dlc *d) 482 { 483 BT_DBG("dlc %p state %ld", d, d->state); 484 485 if (!d->cfc) { 486 d->v24_sig &= ~RFCOMM_V24_FC; 487 set_bit(RFCOMM_MSC_PENDING, &d->flags); 488 } 489 rfcomm_schedule(RFCOMM_SCHED_TX); 490 } 491 492 /* 493 Set/get modem status functions use _local_ status i.e. what we report 494 to the other side. 495 Remote status is provided by dlc->modem_status() callback. 496 */ 497 int rfcomm_dlc_set_modem_status(struct rfcomm_dlc *d, u8 v24_sig) 498 { 499 BT_DBG("dlc %p state %ld v24_sig 0x%x", 500 d, d->state, v24_sig); 501 502 if (test_bit(RFCOMM_RX_THROTTLED, &d->flags)) 503 v24_sig |= RFCOMM_V24_FC; 504 else 505 v24_sig &= ~RFCOMM_V24_FC; 506 507 d->v24_sig = v24_sig; 508 509 if (!test_and_set_bit(RFCOMM_MSC_PENDING, &d->flags)) 510 rfcomm_schedule(RFCOMM_SCHED_TX); 511 512 return 0; 513 } 514 515 int rfcomm_dlc_get_modem_status(struct rfcomm_dlc *d, u8 *v24_sig) 516 { 517 BT_DBG("dlc %p state %ld v24_sig 0x%x", 518 d, d->state, d->v24_sig); 519 520 *v24_sig = d->v24_sig; 521 return 0; 522 } 523 524 /* ---- RFCOMM sessions ---- */ 525 static struct rfcomm_session *rfcomm_session_add(struct socket *sock, int state) 526 { 527 struct rfcomm_session *s = kzalloc(sizeof(*s), GFP_KERNEL); 528 529 if (!s) 530 return NULL; 531 532 BT_DBG("session %p sock %p", s, sock); 533 534 INIT_LIST_HEAD(&s->dlcs); 535 s->state = state; 536 s->sock = sock; 537 538 s->mtu = RFCOMM_DEFAULT_MTU; 539 s->cfc = disable_cfc ? RFCOMM_CFC_DISABLED : RFCOMM_CFC_UNKNOWN; 540 541 /* Do not increment module usage count for listening sessions. 542 * Otherwise we won't be able to unload the module. */ 543 if (state != BT_LISTEN) 544 if (!try_module_get(THIS_MODULE)) { 545 kfree(s); 546 return NULL; 547 } 548 549 list_add(&s->list, &session_list); 550 551 return s; 552 } 553 554 static void rfcomm_session_del(struct rfcomm_session *s) 555 { 556 int state = s->state; 557 558 BT_DBG("session %p state %ld", s, s->state); 559 560 list_del(&s->list); 561 562 if (state == BT_CONNECTED) 563 rfcomm_send_disc(s, 0); 564 565 sock_release(s->sock); 566 kfree(s); 567 568 if (state != BT_LISTEN) 569 module_put(THIS_MODULE); 570 } 571 572 static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst) 573 { 574 struct rfcomm_session *s; 575 struct list_head *p, *n; 576 struct bt_sock *sk; 577 list_for_each_safe(p, n, &session_list) { 578 s = list_entry(p, struct rfcomm_session, list); 579 sk = bt_sk(s->sock->sk); 580 581 if ((!bacmp(src, BDADDR_ANY) || !bacmp(&sk->src, src)) && 582 !bacmp(&sk->dst, dst)) 583 return s; 584 } 585 return NULL; 586 } 587 588 static void rfcomm_session_close(struct rfcomm_session *s, int err) 589 { 590 struct rfcomm_dlc *d; 591 struct list_head *p, *n; 592 593 BT_DBG("session %p state %ld err %d", s, s->state, err); 594 595 rfcomm_session_hold(s); 596 597 s->state = BT_CLOSED; 598 599 /* Close all dlcs */ 600 list_for_each_safe(p, n, &s->dlcs) { 601 d = list_entry(p, struct rfcomm_dlc, list); 602 d->state = BT_CLOSED; 603 __rfcomm_dlc_close(d, err); 604 } 605 606 rfcomm_session_put(s); 607 } 608 609 static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src, bdaddr_t *dst, int *err) 610 { 611 struct rfcomm_session *s = NULL; 612 struct sockaddr_l2 addr; 613 struct socket *sock; 614 struct sock *sk; 615 616 BT_DBG("%s %s", batostr(src), batostr(dst)); 617 618 *err = rfcomm_l2sock_create(&sock); 619 if (*err < 0) 620 return NULL; 621 622 bacpy(&addr.l2_bdaddr, src); 623 addr.l2_family = AF_BLUETOOTH; 624 addr.l2_psm = 0; 625 *err = sock->ops->bind(sock, (struct sockaddr *) &addr, sizeof(addr)); 626 if (*err < 0) 627 goto failed; 628 629 /* Set L2CAP options */ 630 sk = sock->sk; 631 lock_sock(sk); 632 l2cap_pi(sk)->imtu = l2cap_mtu; 633 release_sock(sk); 634 635 s = rfcomm_session_add(sock, BT_BOUND); 636 if (!s) { 637 *err = -ENOMEM; 638 goto failed; 639 } 640 641 s->initiator = 1; 642 643 bacpy(&addr.l2_bdaddr, dst); 644 addr.l2_family = AF_BLUETOOTH; 645 addr.l2_psm = htobs(RFCOMM_PSM); 646 *err = sock->ops->connect(sock, (struct sockaddr *) &addr, sizeof(addr), O_NONBLOCK); 647 if (*err == 0 || *err == -EAGAIN) 648 return s; 649 650 rfcomm_session_del(s); 651 return NULL; 652 653 failed: 654 sock_release(sock); 655 return NULL; 656 } 657 658 void rfcomm_session_getaddr(struct rfcomm_session *s, bdaddr_t *src, bdaddr_t *dst) 659 { 660 struct sock *sk = s->sock->sk; 661 if (src) 662 bacpy(src, &bt_sk(sk)->src); 663 if (dst) 664 bacpy(dst, &bt_sk(sk)->dst); 665 } 666 667 /* ---- RFCOMM frame sending ---- */ 668 static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len) 669 { 670 struct socket *sock = s->sock; 671 struct kvec iv = { data, len }; 672 struct msghdr msg; 673 674 BT_DBG("session %p len %d", s, len); 675 676 memset(&msg, 0, sizeof(msg)); 677 678 return kernel_sendmsg(sock, &msg, &iv, 1, len); 679 } 680 681 static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci) 682 { 683 struct rfcomm_cmd cmd; 684 685 BT_DBG("%p dlci %d", s, dlci); 686 687 cmd.addr = __addr(s->initiator, dlci); 688 cmd.ctrl = __ctrl(RFCOMM_SABM, 1); 689 cmd.len = __len8(0); 690 cmd.fcs = __fcs2((u8 *) &cmd); 691 692 return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd)); 693 } 694 695 static int rfcomm_send_ua(struct rfcomm_session *s, u8 dlci) 696 { 697 struct rfcomm_cmd cmd; 698 699 BT_DBG("%p dlci %d", s, dlci); 700 701 cmd.addr = __addr(!s->initiator, dlci); 702 cmd.ctrl = __ctrl(RFCOMM_UA, 1); 703 cmd.len = __len8(0); 704 cmd.fcs = __fcs2((u8 *) &cmd); 705 706 return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd)); 707 } 708 709 static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci) 710 { 711 struct rfcomm_cmd cmd; 712 713 BT_DBG("%p dlci %d", s, dlci); 714 715 cmd.addr = __addr(s->initiator, dlci); 716 cmd.ctrl = __ctrl(RFCOMM_DISC, 1); 717 cmd.len = __len8(0); 718 cmd.fcs = __fcs2((u8 *) &cmd); 719 720 return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd)); 721 } 722 723 static int rfcomm_queue_disc(struct rfcomm_dlc *d) 724 { 725 struct rfcomm_cmd *cmd; 726 struct sk_buff *skb; 727 728 BT_DBG("dlc %p dlci %d", d, d->dlci); 729 730 skb = alloc_skb(sizeof(*cmd), GFP_KERNEL); 731 if (!skb) 732 return -ENOMEM; 733 734 cmd = (void *) __skb_put(skb, sizeof(*cmd)); 735 cmd->addr = d->addr; 736 cmd->ctrl = __ctrl(RFCOMM_DISC, 1); 737 cmd->len = __len8(0); 738 cmd->fcs = __fcs2((u8 *) cmd); 739 740 skb_queue_tail(&d->tx_queue, skb); 741 rfcomm_schedule(RFCOMM_SCHED_TX); 742 return 0; 743 } 744 745 static int rfcomm_send_dm(struct rfcomm_session *s, u8 dlci) 746 { 747 struct rfcomm_cmd cmd; 748 749 BT_DBG("%p dlci %d", s, dlci); 750 751 cmd.addr = __addr(!s->initiator, dlci); 752 cmd.ctrl = __ctrl(RFCOMM_DM, 1); 753 cmd.len = __len8(0); 754 cmd.fcs = __fcs2((u8 *) &cmd); 755 756 return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd)); 757 } 758 759 static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type) 760 { 761 struct rfcomm_hdr *hdr; 762 struct rfcomm_mcc *mcc; 763 u8 buf[16], *ptr = buf; 764 765 BT_DBG("%p cr %d type %d", s, cr, type); 766 767 hdr = (void *) ptr; ptr += sizeof(*hdr); 768 hdr->addr = __addr(s->initiator, 0); 769 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 770 hdr->len = __len8(sizeof(*mcc) + 1); 771 772 mcc = (void *) ptr; ptr += sizeof(*mcc); 773 mcc->type = __mcc_type(cr, RFCOMM_NSC); 774 mcc->len = __len8(1); 775 776 /* Type that we didn't like */ 777 *ptr = __mcc_type(cr, type); ptr++; 778 779 *ptr = __fcs(buf); ptr++; 780 781 return rfcomm_send_frame(s, buf, ptr - buf); 782 } 783 784 static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d) 785 { 786 struct rfcomm_hdr *hdr; 787 struct rfcomm_mcc *mcc; 788 struct rfcomm_pn *pn; 789 u8 buf[16], *ptr = buf; 790 791 BT_DBG("%p cr %d dlci %d mtu %d", s, cr, d->dlci, d->mtu); 792 793 hdr = (void *) ptr; ptr += sizeof(*hdr); 794 hdr->addr = __addr(s->initiator, 0); 795 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 796 hdr->len = __len8(sizeof(*mcc) + sizeof(*pn)); 797 798 mcc = (void *) ptr; ptr += sizeof(*mcc); 799 mcc->type = __mcc_type(cr, RFCOMM_PN); 800 mcc->len = __len8(sizeof(*pn)); 801 802 pn = (void *) ptr; ptr += sizeof(*pn); 803 pn->dlci = d->dlci; 804 pn->priority = d->priority; 805 pn->ack_timer = 0; 806 pn->max_retrans = 0; 807 808 if (s->cfc) { 809 pn->flow_ctrl = cr ? 0xf0 : 0xe0; 810 pn->credits = RFCOMM_DEFAULT_CREDITS; 811 } else { 812 pn->flow_ctrl = 0; 813 pn->credits = 0; 814 } 815 816 if (cr && channel_mtu >= 0) 817 pn->mtu = htobs(channel_mtu); 818 else 819 pn->mtu = htobs(d->mtu); 820 821 *ptr = __fcs(buf); ptr++; 822 823 return rfcomm_send_frame(s, buf, ptr - buf); 824 } 825 826 int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci, 827 u8 bit_rate, u8 data_bits, u8 stop_bits, 828 u8 parity, u8 flow_ctrl_settings, 829 u8 xon_char, u8 xoff_char, u16 param_mask) 830 { 831 struct rfcomm_hdr *hdr; 832 struct rfcomm_mcc *mcc; 833 struct rfcomm_rpn *rpn; 834 u8 buf[16], *ptr = buf; 835 836 BT_DBG("%p cr %d dlci %d bit_r 0x%x data_b 0x%x stop_b 0x%x parity 0x%x" 837 " flwc_s 0x%x xon_c 0x%x xoff_c 0x%x p_mask 0x%x", 838 s, cr, dlci, bit_rate, data_bits, stop_bits, parity, 839 flow_ctrl_settings, xon_char, xoff_char, param_mask); 840 841 hdr = (void *) ptr; ptr += sizeof(*hdr); 842 hdr->addr = __addr(s->initiator, 0); 843 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 844 hdr->len = __len8(sizeof(*mcc) + sizeof(*rpn)); 845 846 mcc = (void *) ptr; ptr += sizeof(*mcc); 847 mcc->type = __mcc_type(cr, RFCOMM_RPN); 848 mcc->len = __len8(sizeof(*rpn)); 849 850 rpn = (void *) ptr; ptr += sizeof(*rpn); 851 rpn->dlci = __addr(1, dlci); 852 rpn->bit_rate = bit_rate; 853 rpn->line_settings = __rpn_line_settings(data_bits, stop_bits, parity); 854 rpn->flow_ctrl = flow_ctrl_settings; 855 rpn->xon_char = xon_char; 856 rpn->xoff_char = xoff_char; 857 rpn->param_mask = param_mask; 858 859 *ptr = __fcs(buf); ptr++; 860 861 return rfcomm_send_frame(s, buf, ptr - buf); 862 } 863 864 static int rfcomm_send_rls(struct rfcomm_session *s, int cr, u8 dlci, u8 status) 865 { 866 struct rfcomm_hdr *hdr; 867 struct rfcomm_mcc *mcc; 868 struct rfcomm_rls *rls; 869 u8 buf[16], *ptr = buf; 870 871 BT_DBG("%p cr %d status 0x%x", s, cr, status); 872 873 hdr = (void *) ptr; ptr += sizeof(*hdr); 874 hdr->addr = __addr(s->initiator, 0); 875 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 876 hdr->len = __len8(sizeof(*mcc) + sizeof(*rls)); 877 878 mcc = (void *) ptr; ptr += sizeof(*mcc); 879 mcc->type = __mcc_type(cr, RFCOMM_RLS); 880 mcc->len = __len8(sizeof(*rls)); 881 882 rls = (void *) ptr; ptr += sizeof(*rls); 883 rls->dlci = __addr(1, dlci); 884 rls->status = status; 885 886 *ptr = __fcs(buf); ptr++; 887 888 return rfcomm_send_frame(s, buf, ptr - buf); 889 } 890 891 static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig) 892 { 893 struct rfcomm_hdr *hdr; 894 struct rfcomm_mcc *mcc; 895 struct rfcomm_msc *msc; 896 u8 buf[16], *ptr = buf; 897 898 BT_DBG("%p cr %d v24 0x%x", s, cr, v24_sig); 899 900 hdr = (void *) ptr; ptr += sizeof(*hdr); 901 hdr->addr = __addr(s->initiator, 0); 902 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 903 hdr->len = __len8(sizeof(*mcc) + sizeof(*msc)); 904 905 mcc = (void *) ptr; ptr += sizeof(*mcc); 906 mcc->type = __mcc_type(cr, RFCOMM_MSC); 907 mcc->len = __len8(sizeof(*msc)); 908 909 msc = (void *) ptr; ptr += sizeof(*msc); 910 msc->dlci = __addr(1, dlci); 911 msc->v24_sig = v24_sig | 0x01; 912 913 *ptr = __fcs(buf); ptr++; 914 915 return rfcomm_send_frame(s, buf, ptr - buf); 916 } 917 918 static int rfcomm_send_fcoff(struct rfcomm_session *s, int cr) 919 { 920 struct rfcomm_hdr *hdr; 921 struct rfcomm_mcc *mcc; 922 u8 buf[16], *ptr = buf; 923 924 BT_DBG("%p cr %d", s, cr); 925 926 hdr = (void *) ptr; ptr += sizeof(*hdr); 927 hdr->addr = __addr(s->initiator, 0); 928 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 929 hdr->len = __len8(sizeof(*mcc)); 930 931 mcc = (void *) ptr; ptr += sizeof(*mcc); 932 mcc->type = __mcc_type(cr, RFCOMM_FCOFF); 933 mcc->len = __len8(0); 934 935 *ptr = __fcs(buf); ptr++; 936 937 return rfcomm_send_frame(s, buf, ptr - buf); 938 } 939 940 static int rfcomm_send_fcon(struct rfcomm_session *s, int cr) 941 { 942 struct rfcomm_hdr *hdr; 943 struct rfcomm_mcc *mcc; 944 u8 buf[16], *ptr = buf; 945 946 BT_DBG("%p cr %d", s, cr); 947 948 hdr = (void *) ptr; ptr += sizeof(*hdr); 949 hdr->addr = __addr(s->initiator, 0); 950 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 951 hdr->len = __len8(sizeof(*mcc)); 952 953 mcc = (void *) ptr; ptr += sizeof(*mcc); 954 mcc->type = __mcc_type(cr, RFCOMM_FCON); 955 mcc->len = __len8(0); 956 957 *ptr = __fcs(buf); ptr++; 958 959 return rfcomm_send_frame(s, buf, ptr - buf); 960 } 961 962 static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len) 963 { 964 struct socket *sock = s->sock; 965 struct kvec iv[3]; 966 struct msghdr msg; 967 unsigned char hdr[5], crc[1]; 968 969 if (len > 125) 970 return -EINVAL; 971 972 BT_DBG("%p cr %d", s, cr); 973 974 hdr[0] = __addr(s->initiator, 0); 975 hdr[1] = __ctrl(RFCOMM_UIH, 0); 976 hdr[2] = 0x01 | ((len + 2) << 1); 977 hdr[3] = 0x01 | ((cr & 0x01) << 1) | (RFCOMM_TEST << 2); 978 hdr[4] = 0x01 | (len << 1); 979 980 crc[0] = __fcs(hdr); 981 982 iv[0].iov_base = hdr; 983 iv[0].iov_len = 5; 984 iv[1].iov_base = pattern; 985 iv[1].iov_len = len; 986 iv[2].iov_base = crc; 987 iv[2].iov_len = 1; 988 989 memset(&msg, 0, sizeof(msg)); 990 991 return kernel_sendmsg(sock, &msg, iv, 3, 6 + len); 992 } 993 994 static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits) 995 { 996 struct rfcomm_hdr *hdr; 997 u8 buf[16], *ptr = buf; 998 999 BT_DBG("%p addr %d credits %d", s, addr, credits); 1000 1001 hdr = (void *) ptr; ptr += sizeof(*hdr); 1002 hdr->addr = addr; 1003 hdr->ctrl = __ctrl(RFCOMM_UIH, 1); 1004 hdr->len = __len8(0); 1005 1006 *ptr = credits; ptr++; 1007 1008 *ptr = __fcs(buf); ptr++; 1009 1010 return rfcomm_send_frame(s, buf, ptr - buf); 1011 } 1012 1013 static void rfcomm_make_uih(struct sk_buff *skb, u8 addr) 1014 { 1015 struct rfcomm_hdr *hdr; 1016 int len = skb->len; 1017 u8 *crc; 1018 1019 if (len > 127) { 1020 hdr = (void *) skb_push(skb, 4); 1021 put_unaligned(htobs(__len16(len)), (u16 *) &hdr->len); 1022 } else { 1023 hdr = (void *) skb_push(skb, 3); 1024 hdr->len = __len8(len); 1025 } 1026 hdr->addr = addr; 1027 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 1028 1029 crc = skb_put(skb, 1); 1030 *crc = __fcs((void *) hdr); 1031 } 1032 1033 /* ---- RFCOMM frame reception ---- */ 1034 static int rfcomm_recv_ua(struct rfcomm_session *s, u8 dlci) 1035 { 1036 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); 1037 1038 if (dlci) { 1039 /* Data channel */ 1040 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci); 1041 if (!d) { 1042 rfcomm_send_dm(s, dlci); 1043 return 0; 1044 } 1045 1046 switch (d->state) { 1047 case BT_CONNECT: 1048 rfcomm_dlc_clear_timer(d); 1049 1050 rfcomm_dlc_lock(d); 1051 d->state = BT_CONNECTED; 1052 d->state_change(d, 0); 1053 rfcomm_dlc_unlock(d); 1054 1055 rfcomm_send_msc(s, 1, dlci, d->v24_sig); 1056 break; 1057 1058 case BT_DISCONN: 1059 d->state = BT_CLOSED; 1060 __rfcomm_dlc_close(d, 0); 1061 break; 1062 } 1063 } else { 1064 /* Control channel */ 1065 switch (s->state) { 1066 case BT_CONNECT: 1067 s->state = BT_CONNECTED; 1068 rfcomm_process_connect(s); 1069 break; 1070 } 1071 } 1072 return 0; 1073 } 1074 1075 static int rfcomm_recv_dm(struct rfcomm_session *s, u8 dlci) 1076 { 1077 int err = 0; 1078 1079 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); 1080 1081 if (dlci) { 1082 /* Data DLC */ 1083 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci); 1084 if (d) { 1085 if (d->state == BT_CONNECT || d->state == BT_CONFIG) 1086 err = ECONNREFUSED; 1087 else 1088 err = ECONNRESET; 1089 1090 d->state = BT_CLOSED; 1091 __rfcomm_dlc_close(d, err); 1092 } 1093 } else { 1094 if (s->state == BT_CONNECT) 1095 err = ECONNREFUSED; 1096 else 1097 err = ECONNRESET; 1098 1099 s->state = BT_CLOSED; 1100 rfcomm_session_close(s, err); 1101 } 1102 return 0; 1103 } 1104 1105 static int rfcomm_recv_disc(struct rfcomm_session *s, u8 dlci) 1106 { 1107 int err = 0; 1108 1109 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); 1110 1111 if (dlci) { 1112 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci); 1113 if (d) { 1114 rfcomm_send_ua(s, dlci); 1115 1116 if (d->state == BT_CONNECT || d->state == BT_CONFIG) 1117 err = ECONNREFUSED; 1118 else 1119 err = ECONNRESET; 1120 1121 d->state = BT_CLOSED; 1122 __rfcomm_dlc_close(d, err); 1123 } else 1124 rfcomm_send_dm(s, dlci); 1125 1126 } else { 1127 rfcomm_send_ua(s, 0); 1128 1129 if (s->state == BT_CONNECT) 1130 err = ECONNREFUSED; 1131 else 1132 err = ECONNRESET; 1133 1134 s->state = BT_CLOSED; 1135 rfcomm_session_close(s, err); 1136 } 1137 1138 return 0; 1139 } 1140 1141 static inline int rfcomm_check_link_mode(struct rfcomm_dlc *d) 1142 { 1143 struct sock *sk = d->session->sock->sk; 1144 1145 if (d->link_mode & (RFCOMM_LM_ENCRYPT | RFCOMM_LM_SECURE)) { 1146 if (!hci_conn_encrypt(l2cap_pi(sk)->conn->hcon)) 1147 return 1; 1148 } else if (d->link_mode & RFCOMM_LM_AUTH) { 1149 if (!hci_conn_auth(l2cap_pi(sk)->conn->hcon)) 1150 return 1; 1151 } 1152 1153 return 0; 1154 } 1155 1156 static void rfcomm_dlc_accept(struct rfcomm_dlc *d) 1157 { 1158 struct sock *sk = d->session->sock->sk; 1159 1160 BT_DBG("dlc %p", d); 1161 1162 rfcomm_send_ua(d->session, d->dlci); 1163 1164 rfcomm_dlc_lock(d); 1165 d->state = BT_CONNECTED; 1166 d->state_change(d, 0); 1167 rfcomm_dlc_unlock(d); 1168 1169 if (d->link_mode & RFCOMM_LM_MASTER) 1170 hci_conn_switch_role(l2cap_pi(sk)->conn->hcon, 0x00); 1171 1172 rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig); 1173 } 1174 1175 static int rfcomm_recv_sabm(struct rfcomm_session *s, u8 dlci) 1176 { 1177 struct rfcomm_dlc *d; 1178 u8 channel; 1179 1180 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); 1181 1182 if (!dlci) { 1183 rfcomm_send_ua(s, 0); 1184 1185 if (s->state == BT_OPEN) { 1186 s->state = BT_CONNECTED; 1187 rfcomm_process_connect(s); 1188 } 1189 return 0; 1190 } 1191 1192 /* Check if DLC exists */ 1193 d = rfcomm_dlc_get(s, dlci); 1194 if (d) { 1195 if (d->state == BT_OPEN) { 1196 /* DLC was previously opened by PN request */ 1197 if (rfcomm_check_link_mode(d)) { 1198 set_bit(RFCOMM_AUTH_PENDING, &d->flags); 1199 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); 1200 return 0; 1201 } 1202 1203 rfcomm_dlc_accept(d); 1204 } 1205 return 0; 1206 } 1207 1208 /* Notify socket layer about incoming connection */ 1209 channel = __srv_channel(dlci); 1210 if (rfcomm_connect_ind(s, channel, &d)) { 1211 d->dlci = dlci; 1212 d->addr = __addr(s->initiator, dlci); 1213 rfcomm_dlc_link(s, d); 1214 1215 if (rfcomm_check_link_mode(d)) { 1216 set_bit(RFCOMM_AUTH_PENDING, &d->flags); 1217 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); 1218 return 0; 1219 } 1220 1221 rfcomm_dlc_accept(d); 1222 } else { 1223 rfcomm_send_dm(s, dlci); 1224 } 1225 1226 return 0; 1227 } 1228 1229 static int rfcomm_apply_pn(struct rfcomm_dlc *d, int cr, struct rfcomm_pn *pn) 1230 { 1231 struct rfcomm_session *s = d->session; 1232 1233 BT_DBG("dlc %p state %ld dlci %d mtu %d fc 0x%x credits %d", 1234 d, d->state, d->dlci, pn->mtu, pn->flow_ctrl, pn->credits); 1235 1236 if ((pn->flow_ctrl == 0xf0 && s->cfc != RFCOMM_CFC_DISABLED) || 1237 pn->flow_ctrl == 0xe0) { 1238 d->cfc = RFCOMM_CFC_ENABLED; 1239 d->tx_credits = pn->credits; 1240 } else { 1241 d->cfc = RFCOMM_CFC_DISABLED; 1242 set_bit(RFCOMM_TX_THROTTLED, &d->flags); 1243 } 1244 1245 if (s->cfc == RFCOMM_CFC_UNKNOWN) 1246 s->cfc = d->cfc; 1247 1248 d->priority = pn->priority; 1249 1250 d->mtu = btohs(pn->mtu); 1251 1252 if (cr && d->mtu > s->mtu) 1253 d->mtu = s->mtu; 1254 1255 return 0; 1256 } 1257 1258 static int rfcomm_recv_pn(struct rfcomm_session *s, int cr, struct sk_buff *skb) 1259 { 1260 struct rfcomm_pn *pn = (void *) skb->data; 1261 struct rfcomm_dlc *d; 1262 u8 dlci = pn->dlci; 1263 1264 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); 1265 1266 if (!dlci) 1267 return 0; 1268 1269 d = rfcomm_dlc_get(s, dlci); 1270 if (d) { 1271 if (cr) { 1272 /* PN request */ 1273 rfcomm_apply_pn(d, cr, pn); 1274 rfcomm_send_pn(s, 0, d); 1275 } else { 1276 /* PN response */ 1277 switch (d->state) { 1278 case BT_CONFIG: 1279 rfcomm_apply_pn(d, cr, pn); 1280 1281 d->state = BT_CONNECT; 1282 rfcomm_send_sabm(s, d->dlci); 1283 break; 1284 } 1285 } 1286 } else { 1287 u8 channel = __srv_channel(dlci); 1288 1289 if (!cr) 1290 return 0; 1291 1292 /* PN request for non existing DLC. 1293 * Assume incoming connection. */ 1294 if (rfcomm_connect_ind(s, channel, &d)) { 1295 d->dlci = dlci; 1296 d->addr = __addr(s->initiator, dlci); 1297 rfcomm_dlc_link(s, d); 1298 1299 rfcomm_apply_pn(d, cr, pn); 1300 1301 d->state = BT_OPEN; 1302 rfcomm_send_pn(s, 0, d); 1303 } else { 1304 rfcomm_send_dm(s, dlci); 1305 } 1306 } 1307 return 0; 1308 } 1309 1310 static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_buff *skb) 1311 { 1312 struct rfcomm_rpn *rpn = (void *) skb->data; 1313 u8 dlci = __get_dlci(rpn->dlci); 1314 1315 u8 bit_rate = 0; 1316 u8 data_bits = 0; 1317 u8 stop_bits = 0; 1318 u8 parity = 0; 1319 u8 flow_ctrl = 0; 1320 u8 xon_char = 0; 1321 u8 xoff_char = 0; 1322 u16 rpn_mask = RFCOMM_RPN_PM_ALL; 1323 1324 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", 1325 dlci, cr, len, rpn->bit_rate, rpn->line_settings, rpn->flow_ctrl, 1326 rpn->xon_char, rpn->xoff_char, rpn->param_mask); 1327 1328 if (!cr) 1329 return 0; 1330 1331 if (len == 1) { 1332 /* This is a request, return default settings */ 1333 bit_rate = RFCOMM_RPN_BR_115200; 1334 data_bits = RFCOMM_RPN_DATA_8; 1335 stop_bits = RFCOMM_RPN_STOP_1; 1336 parity = RFCOMM_RPN_PARITY_NONE; 1337 flow_ctrl = RFCOMM_RPN_FLOW_NONE; 1338 xon_char = RFCOMM_RPN_XON_CHAR; 1339 xoff_char = RFCOMM_RPN_XOFF_CHAR; 1340 goto rpn_out; 1341 } 1342 1343 /* Check for sane values, ignore/accept bit_rate, 8 bits, 1 stop bit, 1344 * no parity, no flow control lines, normal XON/XOFF chars */ 1345 1346 if (rpn->param_mask & RFCOMM_RPN_PM_BITRATE) { 1347 bit_rate = rpn->bit_rate; 1348 if (bit_rate != RFCOMM_RPN_BR_115200) { 1349 BT_DBG("RPN bit rate mismatch 0x%x", bit_rate); 1350 bit_rate = RFCOMM_RPN_BR_115200; 1351 rpn_mask ^= RFCOMM_RPN_PM_BITRATE; 1352 } 1353 } 1354 1355 if (rpn->param_mask & RFCOMM_RPN_PM_DATA) { 1356 data_bits = __get_rpn_data_bits(rpn->line_settings); 1357 if (data_bits != RFCOMM_RPN_DATA_8) { 1358 BT_DBG("RPN data bits mismatch 0x%x", data_bits); 1359 data_bits = RFCOMM_RPN_DATA_8; 1360 rpn_mask ^= RFCOMM_RPN_PM_DATA; 1361 } 1362 } 1363 1364 if (rpn->param_mask & RFCOMM_RPN_PM_STOP) { 1365 stop_bits = __get_rpn_stop_bits(rpn->line_settings); 1366 if (stop_bits != RFCOMM_RPN_STOP_1) { 1367 BT_DBG("RPN stop bits mismatch 0x%x", stop_bits); 1368 stop_bits = RFCOMM_RPN_STOP_1; 1369 rpn_mask ^= RFCOMM_RPN_PM_STOP; 1370 } 1371 } 1372 1373 if (rpn->param_mask & RFCOMM_RPN_PM_PARITY) { 1374 parity = __get_rpn_parity(rpn->line_settings); 1375 if (parity != RFCOMM_RPN_PARITY_NONE) { 1376 BT_DBG("RPN parity mismatch 0x%x", parity); 1377 parity = RFCOMM_RPN_PARITY_NONE; 1378 rpn_mask ^= RFCOMM_RPN_PM_PARITY; 1379 } 1380 } 1381 1382 if (rpn->param_mask & RFCOMM_RPN_PM_FLOW) { 1383 flow_ctrl = rpn->flow_ctrl; 1384 if (flow_ctrl != RFCOMM_RPN_FLOW_NONE) { 1385 BT_DBG("RPN flow ctrl mismatch 0x%x", flow_ctrl); 1386 flow_ctrl = RFCOMM_RPN_FLOW_NONE; 1387 rpn_mask ^= RFCOMM_RPN_PM_FLOW; 1388 } 1389 } 1390 1391 if (rpn->param_mask & RFCOMM_RPN_PM_XON) { 1392 xon_char = rpn->xon_char; 1393 if (xon_char != RFCOMM_RPN_XON_CHAR) { 1394 BT_DBG("RPN XON char mismatch 0x%x", xon_char); 1395 xon_char = RFCOMM_RPN_XON_CHAR; 1396 rpn_mask ^= RFCOMM_RPN_PM_XON; 1397 } 1398 } 1399 1400 if (rpn->param_mask & RFCOMM_RPN_PM_XOFF) { 1401 xoff_char = rpn->xoff_char; 1402 if (xoff_char != RFCOMM_RPN_XOFF_CHAR) { 1403 BT_DBG("RPN XOFF char mismatch 0x%x", xoff_char); 1404 xoff_char = RFCOMM_RPN_XOFF_CHAR; 1405 rpn_mask ^= RFCOMM_RPN_PM_XOFF; 1406 } 1407 } 1408 1409 rpn_out: 1410 rfcomm_send_rpn(s, 0, dlci, bit_rate, data_bits, stop_bits, 1411 parity, flow_ctrl, xon_char, xoff_char, rpn_mask); 1412 1413 return 0; 1414 } 1415 1416 static int rfcomm_recv_rls(struct rfcomm_session *s, int cr, struct sk_buff *skb) 1417 { 1418 struct rfcomm_rls *rls = (void *) skb->data; 1419 u8 dlci = __get_dlci(rls->dlci); 1420 1421 BT_DBG("dlci %d cr %d status 0x%x", dlci, cr, rls->status); 1422 1423 if (!cr) 1424 return 0; 1425 1426 /* We should probably do something with this information here. But 1427 * for now it's sufficient just to reply -- Bluetooth 1.1 says it's 1428 * mandatory to recognise and respond to RLS */ 1429 1430 rfcomm_send_rls(s, 0, dlci, rls->status); 1431 1432 return 0; 1433 } 1434 1435 static int rfcomm_recv_msc(struct rfcomm_session *s, int cr, struct sk_buff *skb) 1436 { 1437 struct rfcomm_msc *msc = (void *) skb->data; 1438 struct rfcomm_dlc *d; 1439 u8 dlci = __get_dlci(msc->dlci); 1440 1441 BT_DBG("dlci %d cr %d v24 0x%x", dlci, cr, msc->v24_sig); 1442 1443 d = rfcomm_dlc_get(s, dlci); 1444 if (!d) 1445 return 0; 1446 1447 if (cr) { 1448 if (msc->v24_sig & RFCOMM_V24_FC && !d->cfc) 1449 set_bit(RFCOMM_TX_THROTTLED, &d->flags); 1450 else 1451 clear_bit(RFCOMM_TX_THROTTLED, &d->flags); 1452 1453 rfcomm_dlc_lock(d); 1454 if (d->modem_status) 1455 d->modem_status(d, msc->v24_sig); 1456 rfcomm_dlc_unlock(d); 1457 1458 rfcomm_send_msc(s, 0, dlci, msc->v24_sig); 1459 1460 d->mscex |= RFCOMM_MSCEX_RX; 1461 } else 1462 d->mscex |= RFCOMM_MSCEX_TX; 1463 1464 return 0; 1465 } 1466 1467 static int rfcomm_recv_mcc(struct rfcomm_session *s, struct sk_buff *skb) 1468 { 1469 struct rfcomm_mcc *mcc = (void *) skb->data; 1470 u8 type, cr, len; 1471 1472 cr = __test_cr(mcc->type); 1473 type = __get_mcc_type(mcc->type); 1474 len = __get_mcc_len(mcc->len); 1475 1476 BT_DBG("%p type 0x%x cr %d", s, type, cr); 1477 1478 skb_pull(skb, 2); 1479 1480 switch (type) { 1481 case RFCOMM_PN: 1482 rfcomm_recv_pn(s, cr, skb); 1483 break; 1484 1485 case RFCOMM_RPN: 1486 rfcomm_recv_rpn(s, cr, len, skb); 1487 break; 1488 1489 case RFCOMM_RLS: 1490 rfcomm_recv_rls(s, cr, skb); 1491 break; 1492 1493 case RFCOMM_MSC: 1494 rfcomm_recv_msc(s, cr, skb); 1495 break; 1496 1497 case RFCOMM_FCOFF: 1498 if (cr) { 1499 set_bit(RFCOMM_TX_THROTTLED, &s->flags); 1500 rfcomm_send_fcoff(s, 0); 1501 } 1502 break; 1503 1504 case RFCOMM_FCON: 1505 if (cr) { 1506 clear_bit(RFCOMM_TX_THROTTLED, &s->flags); 1507 rfcomm_send_fcon(s, 0); 1508 } 1509 break; 1510 1511 case RFCOMM_TEST: 1512 if (cr) 1513 rfcomm_send_test(s, 0, skb->data, skb->len); 1514 break; 1515 1516 case RFCOMM_NSC: 1517 break; 1518 1519 default: 1520 BT_ERR("Unknown control type 0x%02x", type); 1521 rfcomm_send_nsc(s, cr, type); 1522 break; 1523 } 1524 return 0; 1525 } 1526 1527 static int rfcomm_recv_data(struct rfcomm_session *s, u8 dlci, int pf, struct sk_buff *skb) 1528 { 1529 struct rfcomm_dlc *d; 1530 1531 BT_DBG("session %p state %ld dlci %d pf %d", s, s->state, dlci, pf); 1532 1533 d = rfcomm_dlc_get(s, dlci); 1534 if (!d) { 1535 rfcomm_send_dm(s, dlci); 1536 goto drop; 1537 } 1538 1539 if (pf && d->cfc) { 1540 u8 credits = *(u8 *) skb->data; skb_pull(skb, 1); 1541 1542 d->tx_credits += credits; 1543 if (d->tx_credits) 1544 clear_bit(RFCOMM_TX_THROTTLED, &d->flags); 1545 } 1546 1547 if (skb->len && d->state == BT_CONNECTED) { 1548 rfcomm_dlc_lock(d); 1549 d->rx_credits--; 1550 d->data_ready(d, skb); 1551 rfcomm_dlc_unlock(d); 1552 return 0; 1553 } 1554 1555 drop: 1556 kfree_skb(skb); 1557 return 0; 1558 } 1559 1560 static int rfcomm_recv_frame(struct rfcomm_session *s, struct sk_buff *skb) 1561 { 1562 struct rfcomm_hdr *hdr = (void *) skb->data; 1563 u8 type, dlci, fcs; 1564 1565 dlci = __get_dlci(hdr->addr); 1566 type = __get_type(hdr->ctrl); 1567 1568 /* Trim FCS */ 1569 skb->len--; skb->tail--; 1570 fcs = *(u8 *) skb->tail; 1571 1572 if (__check_fcs(skb->data, type, fcs)) { 1573 BT_ERR("bad checksum in packet"); 1574 kfree_skb(skb); 1575 return -EILSEQ; 1576 } 1577 1578 if (__test_ea(hdr->len)) 1579 skb_pull(skb, 3); 1580 else 1581 skb_pull(skb, 4); 1582 1583 switch (type) { 1584 case RFCOMM_SABM: 1585 if (__test_pf(hdr->ctrl)) 1586 rfcomm_recv_sabm(s, dlci); 1587 break; 1588 1589 case RFCOMM_DISC: 1590 if (__test_pf(hdr->ctrl)) 1591 rfcomm_recv_disc(s, dlci); 1592 break; 1593 1594 case RFCOMM_UA: 1595 if (__test_pf(hdr->ctrl)) 1596 rfcomm_recv_ua(s, dlci); 1597 break; 1598 1599 case RFCOMM_DM: 1600 rfcomm_recv_dm(s, dlci); 1601 break; 1602 1603 case RFCOMM_UIH: 1604 if (dlci) 1605 return rfcomm_recv_data(s, dlci, __test_pf(hdr->ctrl), skb); 1606 1607 rfcomm_recv_mcc(s, skb); 1608 break; 1609 1610 default: 1611 BT_ERR("Unknown packet type 0x%02x\n", type); 1612 break; 1613 } 1614 kfree_skb(skb); 1615 return 0; 1616 } 1617 1618 /* ---- Connection and data processing ---- */ 1619 1620 static void rfcomm_process_connect(struct rfcomm_session *s) 1621 { 1622 struct rfcomm_dlc *d; 1623 struct list_head *p, *n; 1624 1625 BT_DBG("session %p state %ld", s, s->state); 1626 1627 list_for_each_safe(p, n, &s->dlcs) { 1628 d = list_entry(p, struct rfcomm_dlc, list); 1629 if (d->state == BT_CONFIG) { 1630 d->mtu = s->mtu; 1631 rfcomm_send_pn(s, 1, d); 1632 } 1633 } 1634 } 1635 1636 /* Send data queued for the DLC. 1637 * Return number of frames left in the queue. 1638 */ 1639 static inline int rfcomm_process_tx(struct rfcomm_dlc *d) 1640 { 1641 struct sk_buff *skb; 1642 int err; 1643 1644 BT_DBG("dlc %p state %ld cfc %d rx_credits %d tx_credits %d", 1645 d, d->state, d->cfc, d->rx_credits, d->tx_credits); 1646 1647 /* Send pending MSC */ 1648 if (test_and_clear_bit(RFCOMM_MSC_PENDING, &d->flags)) 1649 rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig); 1650 1651 if (d->cfc) { 1652 /* CFC enabled. 1653 * Give them some credits */ 1654 if (!test_bit(RFCOMM_RX_THROTTLED, &d->flags) && 1655 d->rx_credits <= (d->cfc >> 2)) { 1656 rfcomm_send_credits(d->session, d->addr, d->cfc - d->rx_credits); 1657 d->rx_credits = d->cfc; 1658 } 1659 } else { 1660 /* CFC disabled. 1661 * Give ourselves some credits */ 1662 d->tx_credits = 5; 1663 } 1664 1665 if (test_bit(RFCOMM_TX_THROTTLED, &d->flags)) 1666 return skb_queue_len(&d->tx_queue); 1667 1668 while (d->tx_credits && (skb = skb_dequeue(&d->tx_queue))) { 1669 err = rfcomm_send_frame(d->session, skb->data, skb->len); 1670 if (err < 0) { 1671 skb_queue_head(&d->tx_queue, skb); 1672 break; 1673 } 1674 kfree_skb(skb); 1675 d->tx_credits--; 1676 } 1677 1678 if (d->cfc && !d->tx_credits) { 1679 /* We're out of TX credits. 1680 * Set TX_THROTTLED flag to avoid unnesary wakeups by dlc_send. */ 1681 set_bit(RFCOMM_TX_THROTTLED, &d->flags); 1682 } 1683 1684 return skb_queue_len(&d->tx_queue); 1685 } 1686 1687 static inline void rfcomm_process_dlcs(struct rfcomm_session *s) 1688 { 1689 struct rfcomm_dlc *d; 1690 struct list_head *p, *n; 1691 1692 BT_DBG("session %p state %ld", s, s->state); 1693 1694 list_for_each_safe(p, n, &s->dlcs) { 1695 d = list_entry(p, struct rfcomm_dlc, list); 1696 1697 if (test_bit(RFCOMM_TIMED_OUT, &d->flags)) { 1698 __rfcomm_dlc_close(d, ETIMEDOUT); 1699 continue; 1700 } 1701 1702 if (test_and_clear_bit(RFCOMM_AUTH_ACCEPT, &d->flags)) { 1703 rfcomm_dlc_clear_timer(d); 1704 rfcomm_dlc_accept(d); 1705 if (d->link_mode & RFCOMM_LM_SECURE) { 1706 struct sock *sk = s->sock->sk; 1707 hci_conn_change_link_key(l2cap_pi(sk)->conn->hcon); 1708 } 1709 continue; 1710 } else if (test_and_clear_bit(RFCOMM_AUTH_REJECT, &d->flags)) { 1711 rfcomm_dlc_clear_timer(d); 1712 rfcomm_send_dm(s, d->dlci); 1713 __rfcomm_dlc_close(d, ECONNREFUSED); 1714 continue; 1715 } 1716 1717 if (test_bit(RFCOMM_TX_THROTTLED, &s->flags)) 1718 continue; 1719 1720 if ((d->state == BT_CONNECTED || d->state == BT_DISCONN) && 1721 d->mscex == RFCOMM_MSCEX_OK) 1722 rfcomm_process_tx(d); 1723 } 1724 } 1725 1726 static inline void rfcomm_process_rx(struct rfcomm_session *s) 1727 { 1728 struct socket *sock = s->sock; 1729 struct sock *sk = sock->sk; 1730 struct sk_buff *skb; 1731 1732 BT_DBG("session %p state %ld qlen %d", s, s->state, skb_queue_len(&sk->sk_receive_queue)); 1733 1734 /* Get data directly from socket receive queue without copying it. */ 1735 while ((skb = skb_dequeue(&sk->sk_receive_queue))) { 1736 skb_orphan(skb); 1737 rfcomm_recv_frame(s, skb); 1738 } 1739 1740 if (sk->sk_state == BT_CLOSED) { 1741 if (!s->initiator) 1742 rfcomm_session_put(s); 1743 1744 rfcomm_session_close(s, sk->sk_err); 1745 } 1746 } 1747 1748 static inline void rfcomm_accept_connection(struct rfcomm_session *s) 1749 { 1750 struct socket *sock = s->sock, *nsock; 1751 int err; 1752 1753 /* Fast check for a new connection. 1754 * Avoids unnesesary socket allocations. */ 1755 if (list_empty(&bt_sk(sock->sk)->accept_q)) 1756 return; 1757 1758 BT_DBG("session %p", s); 1759 1760 if (sock_create_lite(PF_BLUETOOTH, sock->type, BTPROTO_L2CAP, &nsock)) 1761 return; 1762 1763 nsock->ops = sock->ops; 1764 1765 __module_get(nsock->ops->owner); 1766 1767 err = sock->ops->accept(sock, nsock, O_NONBLOCK); 1768 if (err < 0) { 1769 sock_release(nsock); 1770 return; 1771 } 1772 1773 /* Set our callbacks */ 1774 nsock->sk->sk_data_ready = rfcomm_l2data_ready; 1775 nsock->sk->sk_state_change = rfcomm_l2state_change; 1776 1777 s = rfcomm_session_add(nsock, BT_OPEN); 1778 if (s) { 1779 rfcomm_session_hold(s); 1780 1781 /* We should adjust MTU on incoming sessions. 1782 * L2CAP MTU minus UIH header and FCS. */ 1783 s->mtu = min(l2cap_pi(nsock->sk)->omtu, l2cap_pi(nsock->sk)->imtu) - 5; 1784 1785 rfcomm_schedule(RFCOMM_SCHED_RX); 1786 } else 1787 sock_release(nsock); 1788 } 1789 1790 static inline void rfcomm_check_connection(struct rfcomm_session *s) 1791 { 1792 struct sock *sk = s->sock->sk; 1793 1794 BT_DBG("%p state %ld", s, s->state); 1795 1796 switch(sk->sk_state) { 1797 case BT_CONNECTED: 1798 s->state = BT_CONNECT; 1799 1800 /* We can adjust MTU on outgoing sessions. 1801 * L2CAP MTU minus UIH header and FCS. */ 1802 s->mtu = min(l2cap_pi(sk)->omtu, l2cap_pi(sk)->imtu) - 5; 1803 1804 rfcomm_send_sabm(s, 0); 1805 break; 1806 1807 case BT_CLOSED: 1808 s->state = BT_CLOSED; 1809 rfcomm_session_close(s, sk->sk_err); 1810 break; 1811 } 1812 } 1813 1814 static inline void rfcomm_process_sessions(void) 1815 { 1816 struct list_head *p, *n; 1817 1818 rfcomm_lock(); 1819 1820 list_for_each_safe(p, n, &session_list) { 1821 struct rfcomm_session *s; 1822 s = list_entry(p, struct rfcomm_session, list); 1823 1824 if (s->state == BT_LISTEN) { 1825 rfcomm_accept_connection(s); 1826 continue; 1827 } 1828 1829 rfcomm_session_hold(s); 1830 1831 switch (s->state) { 1832 case BT_BOUND: 1833 rfcomm_check_connection(s); 1834 break; 1835 1836 default: 1837 rfcomm_process_rx(s); 1838 break; 1839 } 1840 1841 rfcomm_process_dlcs(s); 1842 1843 rfcomm_session_put(s); 1844 } 1845 1846 rfcomm_unlock(); 1847 } 1848 1849 static void rfcomm_worker(void) 1850 { 1851 BT_DBG(""); 1852 1853 while (!atomic_read(&terminate)) { 1854 if (!test_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event)) { 1855 /* No pending events. Let's sleep. 1856 * Incoming connections and data will wake us up. */ 1857 set_current_state(TASK_INTERRUPTIBLE); 1858 schedule(); 1859 } 1860 1861 /* Process stuff */ 1862 clear_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event); 1863 rfcomm_process_sessions(); 1864 } 1865 set_current_state(TASK_RUNNING); 1866 return; 1867 } 1868 1869 static int rfcomm_add_listener(bdaddr_t *ba) 1870 { 1871 struct sockaddr_l2 addr; 1872 struct socket *sock; 1873 struct sock *sk; 1874 struct rfcomm_session *s; 1875 int err = 0; 1876 1877 /* Create socket */ 1878 err = rfcomm_l2sock_create(&sock); 1879 if (err < 0) { 1880 BT_ERR("Create socket failed %d", err); 1881 return err; 1882 } 1883 1884 /* Bind socket */ 1885 bacpy(&addr.l2_bdaddr, ba); 1886 addr.l2_family = AF_BLUETOOTH; 1887 addr.l2_psm = htobs(RFCOMM_PSM); 1888 err = sock->ops->bind(sock, (struct sockaddr *) &addr, sizeof(addr)); 1889 if (err < 0) { 1890 BT_ERR("Bind failed %d", err); 1891 goto failed; 1892 } 1893 1894 /* Set L2CAP options */ 1895 sk = sock->sk; 1896 lock_sock(sk); 1897 l2cap_pi(sk)->imtu = l2cap_mtu; 1898 release_sock(sk); 1899 1900 /* Start listening on the socket */ 1901 err = sock->ops->listen(sock, 10); 1902 if (err) { 1903 BT_ERR("Listen failed %d", err); 1904 goto failed; 1905 } 1906 1907 /* Add listening session */ 1908 s = rfcomm_session_add(sock, BT_LISTEN); 1909 if (!s) 1910 goto failed; 1911 1912 rfcomm_session_hold(s); 1913 return 0; 1914 failed: 1915 sock_release(sock); 1916 return err; 1917 } 1918 1919 static void rfcomm_kill_listener(void) 1920 { 1921 struct rfcomm_session *s; 1922 struct list_head *p, *n; 1923 1924 BT_DBG(""); 1925 1926 list_for_each_safe(p, n, &session_list) { 1927 s = list_entry(p, struct rfcomm_session, list); 1928 rfcomm_session_del(s); 1929 } 1930 } 1931 1932 static int rfcomm_run(void *unused) 1933 { 1934 rfcomm_thread = current; 1935 1936 atomic_inc(&running); 1937 1938 daemonize("krfcommd"); 1939 set_user_nice(current, -10); 1940 current->flags |= PF_NOFREEZE; 1941 1942 BT_DBG(""); 1943 1944 rfcomm_add_listener(BDADDR_ANY); 1945 1946 rfcomm_worker(); 1947 1948 rfcomm_kill_listener(); 1949 1950 atomic_dec(&running); 1951 return 0; 1952 } 1953 1954 static void rfcomm_auth_cfm(struct hci_conn *conn, u8 status) 1955 { 1956 struct rfcomm_session *s; 1957 struct rfcomm_dlc *d; 1958 struct list_head *p, *n; 1959 1960 BT_DBG("conn %p status 0x%02x", conn, status); 1961 1962 s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst); 1963 if (!s) 1964 return; 1965 1966 rfcomm_session_hold(s); 1967 1968 list_for_each_safe(p, n, &s->dlcs) { 1969 d = list_entry(p, struct rfcomm_dlc, list); 1970 1971 if (d->link_mode & (RFCOMM_LM_ENCRYPT | RFCOMM_LM_SECURE)) 1972 continue; 1973 1974 if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags)) 1975 continue; 1976 1977 if (!status) 1978 set_bit(RFCOMM_AUTH_ACCEPT, &d->flags); 1979 else 1980 set_bit(RFCOMM_AUTH_REJECT, &d->flags); 1981 } 1982 1983 rfcomm_session_put(s); 1984 1985 rfcomm_schedule(RFCOMM_SCHED_AUTH); 1986 } 1987 1988 static void rfcomm_encrypt_cfm(struct hci_conn *conn, u8 status, u8 encrypt) 1989 { 1990 struct rfcomm_session *s; 1991 struct rfcomm_dlc *d; 1992 struct list_head *p, *n; 1993 1994 BT_DBG("conn %p status 0x%02x encrypt 0x%02x", conn, status, encrypt); 1995 1996 s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst); 1997 if (!s) 1998 return; 1999 2000 rfcomm_session_hold(s); 2001 2002 list_for_each_safe(p, n, &s->dlcs) { 2003 d = list_entry(p, struct rfcomm_dlc, list); 2004 2005 if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags)) 2006 continue; 2007 2008 if (!status && encrypt) 2009 set_bit(RFCOMM_AUTH_ACCEPT, &d->flags); 2010 else 2011 set_bit(RFCOMM_AUTH_REJECT, &d->flags); 2012 } 2013 2014 rfcomm_session_put(s); 2015 2016 rfcomm_schedule(RFCOMM_SCHED_AUTH); 2017 } 2018 2019 static struct hci_cb rfcomm_cb = { 2020 .name = "RFCOMM", 2021 .auth_cfm = rfcomm_auth_cfm, 2022 .encrypt_cfm = rfcomm_encrypt_cfm 2023 }; 2024 2025 static ssize_t rfcomm_dlc_sysfs_show(struct class *dev, char *buf) 2026 { 2027 struct rfcomm_session *s; 2028 struct list_head *pp, *p; 2029 char *str = buf; 2030 2031 rfcomm_lock(); 2032 2033 list_for_each(p, &session_list) { 2034 s = list_entry(p, struct rfcomm_session, list); 2035 list_for_each(pp, &s->dlcs) { 2036 struct sock *sk = s->sock->sk; 2037 struct rfcomm_dlc *d = list_entry(pp, struct rfcomm_dlc, list); 2038 2039 str += sprintf(str, "%s %s %ld %d %d %d %d\n", 2040 batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst), 2041 d->state, d->dlci, d->mtu, d->rx_credits, d->tx_credits); 2042 } 2043 } 2044 2045 rfcomm_unlock(); 2046 2047 return (str - buf); 2048 } 2049 2050 static CLASS_ATTR(rfcomm_dlc, S_IRUGO, rfcomm_dlc_sysfs_show, NULL); 2051 2052 /* ---- Initialization ---- */ 2053 static int __init rfcomm_init(void) 2054 { 2055 l2cap_load(); 2056 2057 hci_register_cb(&rfcomm_cb); 2058 2059 kernel_thread(rfcomm_run, NULL, CLONE_KERNEL); 2060 2061 class_create_file(bt_class, &class_attr_rfcomm_dlc); 2062 2063 rfcomm_init_sockets(); 2064 2065 #ifdef CONFIG_BT_RFCOMM_TTY 2066 rfcomm_init_ttys(); 2067 #endif 2068 2069 BT_INFO("RFCOMM ver %s", VERSION); 2070 2071 return 0; 2072 } 2073 2074 static void __exit rfcomm_exit(void) 2075 { 2076 class_remove_file(bt_class, &class_attr_rfcomm_dlc); 2077 2078 hci_unregister_cb(&rfcomm_cb); 2079 2080 /* Terminate working thread. 2081 * ie. Set terminate flag and wake it up */ 2082 atomic_inc(&terminate); 2083 rfcomm_schedule(RFCOMM_SCHED_STATE); 2084 2085 /* Wait until thread is running */ 2086 while (atomic_read(&running)) 2087 schedule(); 2088 2089 #ifdef CONFIG_BT_RFCOMM_TTY 2090 rfcomm_cleanup_ttys(); 2091 #endif 2092 2093 rfcomm_cleanup_sockets(); 2094 } 2095 2096 module_init(rfcomm_init); 2097 module_exit(rfcomm_exit); 2098 2099 module_param(disable_cfc, bool, 0644); 2100 MODULE_PARM_DESC(disable_cfc, "Disable credit based flow control"); 2101 2102 module_param(channel_mtu, int, 0644); 2103 MODULE_PARM_DESC(channel_mtu, "Default MTU for the RFCOMM channel"); 2104 2105 module_param(l2cap_mtu, uint, 0644); 2106 MODULE_PARM_DESC(l2cap_mtu, "Default MTU for the L2CAP connection"); 2107 2108 MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>"); 2109 MODULE_DESCRIPTION("Bluetooth RFCOMM ver " VERSION); 2110 MODULE_VERSION(VERSION); 2111 MODULE_LICENSE("GPL"); 2112 MODULE_ALIAS("bt-proto-3"); 2113