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 28#include <linux/module.h> 29#include <linux/debugfs.h> 30#include <linux/kthread.h> 31#include <asm/unaligned.h> 32 33#include <net/bluetooth/bluetooth.h> 34#include <net/bluetooth/hci_core.h> 35#include <net/bluetooth/l2cap.h> 36#include <net/bluetooth/rfcomm.h> 37 38#include <trace/events/sock.h> 39 40#define VERSION "1.11" 41 42static bool disable_cfc; 43static bool l2cap_ertm; 44static int channel_mtu = -1; 45 46static struct task_struct *rfcomm_thread; 47 48static DEFINE_MUTEX(rfcomm_mutex); 49#define rfcomm_lock() mutex_lock(&rfcomm_mutex) 50#define rfcomm_unlock() mutex_unlock(&rfcomm_mutex) 51 52 53static LIST_HEAD(session_list); 54 55static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len); 56static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci); 57static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci); 58static int rfcomm_queue_disc(struct rfcomm_dlc *d); 59static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type); 60static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d); 61static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig); 62static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len); 63static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits); 64static void rfcomm_make_uih(struct sk_buff *skb, u8 addr); 65 66static void rfcomm_process_connect(struct rfcomm_session *s); 67 68static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src, 69 bdaddr_t *dst, 70 u8 sec_level, 71 int *err); 72static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst); 73static struct rfcomm_session *rfcomm_session_del(struct rfcomm_session *s); 74 75/* ---- RFCOMM frame parsing macros ---- */ 76#define __get_dlci(b) ((b & 0xfc) >> 2) 77#define __get_type(b) ((b & 0xef)) 78 79#define __test_ea(b) ((b & 0x01)) 80#define __test_cr(b) (!!(b & 0x02)) 81#define __test_pf(b) (!!(b & 0x10)) 82 83#define __session_dir(s) ((s)->initiator ? 0x00 : 0x01) 84 85#define __addr(cr, dlci) (((dlci & 0x3f) << 2) | (cr << 1) | 0x01) 86#define __ctrl(type, pf) (((type & 0xef) | (pf << 4))) 87#define __dlci(dir, chn) (((chn & 0x1f) << 1) | dir) 88#define __srv_channel(dlci) (dlci >> 1) 89 90#define __len8(len) (((len) << 1) | 1) 91#define __len16(len) ((len) << 1) 92 93/* MCC macros */ 94#define __mcc_type(cr, type) (((type << 2) | (cr << 1) | 0x01)) 95#define __get_mcc_type(b) ((b & 0xfc) >> 2) 96#define __get_mcc_len(b) ((b & 0xfe) >> 1) 97 98/* RPN macros */ 99#define __rpn_line_settings(data, stop, parity) ((data & 0x3) | ((stop & 0x1) << 2) | ((parity & 0x7) << 3)) 100#define __get_rpn_data_bits(line) ((line) & 0x3) 101#define __get_rpn_stop_bits(line) (((line) >> 2) & 0x1) 102#define __get_rpn_parity(line) (((line) >> 3) & 0x7) 103 104static DECLARE_WAIT_QUEUE_HEAD(rfcomm_wq); 105 106static void rfcomm_schedule(void) 107{ 108 wake_up_all(&rfcomm_wq); 109} 110 111/* ---- RFCOMM FCS computation ---- */ 112 113/* reversed, 8-bit, poly=0x07 */ 114static unsigned char rfcomm_crc_table[256] = { 115 0x00, 0x91, 0xe3, 0x72, 0x07, 0x96, 0xe4, 0x75, 116 0x0e, 0x9f, 0xed, 0x7c, 0x09, 0x98, 0xea, 0x7b, 117 0x1c, 0x8d, 0xff, 0x6e, 0x1b, 0x8a, 0xf8, 0x69, 118 0x12, 0x83, 0xf1, 0x60, 0x15, 0x84, 0xf6, 0x67, 119 120 0x38, 0xa9, 0xdb, 0x4a, 0x3f, 0xae, 0xdc, 0x4d, 121 0x36, 0xa7, 0xd5, 0x44, 0x31, 0xa0, 0xd2, 0x43, 122 0x24, 0xb5, 0xc7, 0x56, 0x23, 0xb2, 0xc0, 0x51, 123 0x2a, 0xbb, 0xc9, 0x58, 0x2d, 0xbc, 0xce, 0x5f, 124 125 0x70, 0xe1, 0x93, 0x02, 0x77, 0xe6, 0x94, 0x05, 126 0x7e, 0xef, 0x9d, 0x0c, 0x79, 0xe8, 0x9a, 0x0b, 127 0x6c, 0xfd, 0x8f, 0x1e, 0x6b, 0xfa, 0x88, 0x19, 128 0x62, 0xf3, 0x81, 0x10, 0x65, 0xf4, 0x86, 0x17, 129 130 0x48, 0xd9, 0xab, 0x3a, 0x4f, 0xde, 0xac, 0x3d, 131 0x46, 0xd7, 0xa5, 0x34, 0x41, 0xd0, 0xa2, 0x33, 132 0x54, 0xc5, 0xb7, 0x26, 0x53, 0xc2, 0xb0, 0x21, 133 0x5a, 0xcb, 0xb9, 0x28, 0x5d, 0xcc, 0xbe, 0x2f, 134 135 0xe0, 0x71, 0x03, 0x92, 0xe7, 0x76, 0x04, 0x95, 136 0xee, 0x7f, 0x0d, 0x9c, 0xe9, 0x78, 0x0a, 0x9b, 137 0xfc, 0x6d, 0x1f, 0x8e, 0xfb, 0x6a, 0x18, 0x89, 138 0xf2, 0x63, 0x11, 0x80, 0xf5, 0x64, 0x16, 0x87, 139 140 0xd8, 0x49, 0x3b, 0xaa, 0xdf, 0x4e, 0x3c, 0xad, 141 0xd6, 0x47, 0x35, 0xa4, 0xd1, 0x40, 0x32, 0xa3, 142 0xc4, 0x55, 0x27, 0xb6, 0xc3, 0x52, 0x20, 0xb1, 143 0xca, 0x5b, 0x29, 0xb8, 0xcd, 0x5c, 0x2e, 0xbf, 144 145 0x90, 0x01, 0x73, 0xe2, 0x97, 0x06, 0x74, 0xe5, 146 0x9e, 0x0f, 0x7d, 0xec, 0x99, 0x08, 0x7a, 0xeb, 147 0x8c, 0x1d, 0x6f, 0xfe, 0x8b, 0x1a, 0x68, 0xf9, 148 0x82, 0x13, 0x61, 0xf0, 0x85, 0x14, 0x66, 0xf7, 149 150 0xa8, 0x39, 0x4b, 0xda, 0xaf, 0x3e, 0x4c, 0xdd, 151 0xa6, 0x37, 0x45, 0xd4, 0xa1, 0x30, 0x42, 0xd3, 152 0xb4, 0x25, 0x57, 0xc6, 0xb3, 0x22, 0x50, 0xc1, 153 0xba, 0x2b, 0x59, 0xc8, 0xbd, 0x2c, 0x5e, 0xcf 154}; 155 156/* CRC on 2 bytes */ 157#define __crc(data) (rfcomm_crc_table[rfcomm_crc_table[0xff ^ data[0]] ^ data[1]]) 158 159/* FCS on 2 bytes */ 160static inline u8 __fcs(u8 *data) 161{ 162 return 0xff - __crc(data); 163} 164 165/* FCS on 3 bytes */ 166static inline u8 __fcs2(u8 *data) 167{ 168 return 0xff - rfcomm_crc_table[__crc(data) ^ data[2]]; 169} 170 171/* Check FCS */ 172static inline int __check_fcs(u8 *data, int type, u8 fcs) 173{ 174 u8 f = __crc(data); 175 176 if (type != RFCOMM_UIH) 177 f = rfcomm_crc_table[f ^ data[2]]; 178 179 return rfcomm_crc_table[f ^ fcs] != 0xcf; 180} 181 182/* ---- L2CAP callbacks ---- */ 183static void rfcomm_l2state_change(struct sock *sk) 184{ 185 BT_DBG("%p state %d", sk, sk->sk_state); 186 rfcomm_schedule(); 187} 188 189static void rfcomm_l2data_ready(struct sock *sk) 190{ 191 trace_sk_data_ready(sk); 192 193 BT_DBG("%p", sk); 194 rfcomm_schedule(); 195} 196 197static int rfcomm_l2sock_create(struct socket **sock) 198{ 199 int err; 200 201 BT_DBG(""); 202 203 err = sock_create_kern(&init_net, PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP, sock); 204 if (!err) { 205 struct sock *sk = (*sock)->sk; 206 sk->sk_data_ready = rfcomm_l2data_ready; 207 sk->sk_state_change = rfcomm_l2state_change; 208 } 209 return err; 210} 211 212static int rfcomm_check_security(struct rfcomm_dlc *d) 213{ 214 struct sock *sk = d->session->sock->sk; 215 struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn; 216 217 __u8 auth_type; 218 219 switch (d->sec_level) { 220 case BT_SECURITY_HIGH: 221 case BT_SECURITY_FIPS: 222 auth_type = HCI_AT_GENERAL_BONDING_MITM; 223 break; 224 case BT_SECURITY_MEDIUM: 225 auth_type = HCI_AT_GENERAL_BONDING; 226 break; 227 default: 228 auth_type = HCI_AT_NO_BONDING; 229 break; 230 } 231 232 return hci_conn_security(conn->hcon, d->sec_level, auth_type, 233 d->out); 234} 235 236static void rfcomm_session_timeout(struct timer_list *t) 237{ 238 struct rfcomm_session *s = from_timer(s, t, timer); 239 240 BT_DBG("session %p state %ld", s, s->state); 241 242 set_bit(RFCOMM_TIMED_OUT, &s->flags); 243 rfcomm_schedule(); 244} 245 246static void rfcomm_session_set_timer(struct rfcomm_session *s, long timeout) 247{ 248 BT_DBG("session %p state %ld timeout %ld", s, s->state, timeout); 249 250 mod_timer(&s->timer, jiffies + timeout); 251} 252 253static void rfcomm_session_clear_timer(struct rfcomm_session *s) 254{ 255 BT_DBG("session %p state %ld", s, s->state); 256 257 del_timer_sync(&s->timer); 258} 259 260/* ---- RFCOMM DLCs ---- */ 261static void rfcomm_dlc_timeout(struct timer_list *t) 262{ 263 struct rfcomm_dlc *d = from_timer(d, t, timer); 264 265 BT_DBG("dlc %p state %ld", d, d->state); 266 267 set_bit(RFCOMM_TIMED_OUT, &d->flags); 268 rfcomm_dlc_put(d); 269 rfcomm_schedule(); 270} 271 272static void rfcomm_dlc_set_timer(struct rfcomm_dlc *d, long timeout) 273{ 274 BT_DBG("dlc %p state %ld timeout %ld", d, d->state, timeout); 275 276 if (!mod_timer(&d->timer, jiffies + timeout)) 277 rfcomm_dlc_hold(d); 278} 279 280static void rfcomm_dlc_clear_timer(struct rfcomm_dlc *d) 281{ 282 BT_DBG("dlc %p state %ld", d, d->state); 283 284 if (del_timer(&d->timer)) 285 rfcomm_dlc_put(d); 286} 287 288static void rfcomm_dlc_clear_state(struct rfcomm_dlc *d) 289{ 290 BT_DBG("%p", d); 291 292 d->state = BT_OPEN; 293 d->flags = 0; 294 d->mscex = 0; 295 d->sec_level = BT_SECURITY_LOW; 296 d->mtu = RFCOMM_DEFAULT_MTU; 297 d->v24_sig = RFCOMM_V24_RTC | RFCOMM_V24_RTR | RFCOMM_V24_DV; 298 299 d->cfc = RFCOMM_CFC_DISABLED; 300 d->rx_credits = RFCOMM_DEFAULT_CREDITS; 301} 302 303struct rfcomm_dlc *rfcomm_dlc_alloc(gfp_t prio) 304{ 305 struct rfcomm_dlc *d = kzalloc(sizeof(*d), prio); 306 307 if (!d) 308 return NULL; 309 310 timer_setup(&d->timer, rfcomm_dlc_timeout, 0); 311 312 skb_queue_head_init(&d->tx_queue); 313 mutex_init(&d->lock); 314 refcount_set(&d->refcnt, 1); 315 316 rfcomm_dlc_clear_state(d); 317 318 BT_DBG("%p", d); 319 320 return d; 321} 322 323void rfcomm_dlc_free(struct rfcomm_dlc *d) 324{ 325 BT_DBG("%p", d); 326 327 skb_queue_purge(&d->tx_queue); 328 kfree(d); 329} 330 331static void rfcomm_dlc_link(struct rfcomm_session *s, struct rfcomm_dlc *d) 332{ 333 BT_DBG("dlc %p session %p", d, s); 334 335 rfcomm_session_clear_timer(s); 336 rfcomm_dlc_hold(d); 337 list_add(&d->list, &s->dlcs); 338 d->session = s; 339} 340 341static void rfcomm_dlc_unlink(struct rfcomm_dlc *d) 342{ 343 struct rfcomm_session *s = d->session; 344 345 BT_DBG("dlc %p refcnt %d session %p", d, refcount_read(&d->refcnt), s); 346 347 list_del(&d->list); 348 d->session = NULL; 349 rfcomm_dlc_put(d); 350 351 if (list_empty(&s->dlcs)) 352 rfcomm_session_set_timer(s, RFCOMM_IDLE_TIMEOUT); 353} 354 355static struct rfcomm_dlc *rfcomm_dlc_get(struct rfcomm_session *s, u8 dlci) 356{ 357 struct rfcomm_dlc *d; 358 359 list_for_each_entry(d, &s->dlcs, list) 360 if (d->dlci == dlci) 361 return d; 362 363 return NULL; 364} 365 366static int rfcomm_check_channel(u8 channel) 367{ 368 return channel < 1 || channel > 30; 369} 370 371static int __rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel) 372{ 373 struct rfcomm_session *s; 374 int err = 0; 375 u8 dlci; 376 377 BT_DBG("dlc %p state %ld %pMR -> %pMR channel %d", 378 d, d->state, src, dst, channel); 379 380 if (rfcomm_check_channel(channel)) 381 return -EINVAL; 382 383 if (d->state != BT_OPEN && d->state != BT_CLOSED) 384 return 0; 385 386 s = rfcomm_session_get(src, dst); 387 if (!s) { 388 s = rfcomm_session_create(src, dst, d->sec_level, &err); 389 if (!s) 390 return err; 391 } 392 393 dlci = __dlci(__session_dir(s), channel); 394 395 /* Check if DLCI already exists */ 396 if (rfcomm_dlc_get(s, dlci)) 397 return -EBUSY; 398 399 rfcomm_dlc_clear_state(d); 400 401 d->dlci = dlci; 402 d->addr = __addr(s->initiator, dlci); 403 d->priority = 7; 404 405 d->state = BT_CONFIG; 406 rfcomm_dlc_link(s, d); 407 408 d->out = 1; 409 410 d->mtu = s->mtu; 411 d->cfc = (s->cfc == RFCOMM_CFC_UNKNOWN) ? 0 : s->cfc; 412 413 if (s->state == BT_CONNECTED) { 414 if (rfcomm_check_security(d)) 415 rfcomm_send_pn(s, 1, d); 416 else 417 set_bit(RFCOMM_AUTH_PENDING, &d->flags); 418 } 419 420 rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT); 421 422 return 0; 423} 424 425int rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel) 426{ 427 int r; 428 429 rfcomm_lock(); 430 431 r = __rfcomm_dlc_open(d, src, dst, channel); 432 433 rfcomm_unlock(); 434 return r; 435} 436 437static void __rfcomm_dlc_disconn(struct rfcomm_dlc *d) 438{ 439 struct rfcomm_session *s = d->session; 440 441 d->state = BT_DISCONN; 442 if (skb_queue_empty(&d->tx_queue)) { 443 rfcomm_send_disc(s, d->dlci); 444 rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT); 445 } else { 446 rfcomm_queue_disc(d); 447 rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT * 2); 448 } 449} 450 451static int __rfcomm_dlc_close(struct rfcomm_dlc *d, int err) 452{ 453 struct rfcomm_session *s = d->session; 454 if (!s) 455 return 0; 456 457 BT_DBG("dlc %p state %ld dlci %d err %d session %p", 458 d, d->state, d->dlci, err, s); 459 460 switch (d->state) { 461 case BT_CONNECT: 462 case BT_CONFIG: 463 case BT_OPEN: 464 case BT_CONNECT2: 465 if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) { 466 set_bit(RFCOMM_AUTH_REJECT, &d->flags); 467 rfcomm_schedule(); 468 return 0; 469 } 470 } 471 472 switch (d->state) { 473 case BT_CONNECT: 474 case BT_CONNECTED: 475 __rfcomm_dlc_disconn(d); 476 break; 477 478 case BT_CONFIG: 479 if (s->state != BT_BOUND) { 480 __rfcomm_dlc_disconn(d); 481 break; 482 } 483 /* if closing a dlc in a session that hasn't been started, 484 * just close and unlink the dlc 485 */ 486 fallthrough; 487 488 default: 489 rfcomm_dlc_clear_timer(d); 490 491 rfcomm_dlc_lock(d); 492 d->state = BT_CLOSED; 493 d->state_change(d, err); 494 rfcomm_dlc_unlock(d); 495 496 skb_queue_purge(&d->tx_queue); 497 rfcomm_dlc_unlink(d); 498 } 499 500 return 0; 501} 502 503int rfcomm_dlc_close(struct rfcomm_dlc *d, int err) 504{ 505 int r = 0; 506 struct rfcomm_dlc *d_list; 507 struct rfcomm_session *s, *s_list; 508 509 BT_DBG("dlc %p state %ld dlci %d err %d", d, d->state, d->dlci, err); 510 511 rfcomm_lock(); 512 513 s = d->session; 514 if (!s) 515 goto no_session; 516 517 /* after waiting on the mutex check the session still exists 518 * then check the dlc still exists 519 */ 520 list_for_each_entry(s_list, &session_list, list) { 521 if (s_list == s) { 522 list_for_each_entry(d_list, &s->dlcs, list) { 523 if (d_list == d) { 524 r = __rfcomm_dlc_close(d, err); 525 break; 526 } 527 } 528 break; 529 } 530 } 531 532no_session: 533 rfcomm_unlock(); 534 return r; 535} 536 537struct rfcomm_dlc *rfcomm_dlc_exists(bdaddr_t *src, bdaddr_t *dst, u8 channel) 538{ 539 struct rfcomm_session *s; 540 struct rfcomm_dlc *dlc = NULL; 541 u8 dlci; 542 543 if (rfcomm_check_channel(channel)) 544 return ERR_PTR(-EINVAL); 545 546 rfcomm_lock(); 547 s = rfcomm_session_get(src, dst); 548 if (s) { 549 dlci = __dlci(__session_dir(s), channel); 550 dlc = rfcomm_dlc_get(s, dlci); 551 } 552 rfcomm_unlock(); 553 return dlc; 554} 555 556static int rfcomm_dlc_send_frag(struct rfcomm_dlc *d, struct sk_buff *frag) 557{ 558 int len = frag->len; 559 560 BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len); 561 562 if (len > d->mtu) 563 return -EINVAL; 564 565 rfcomm_make_uih(frag, d->addr); 566 __skb_queue_tail(&d->tx_queue, frag); 567 568 return len; 569} 570 571int rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb) 572{ 573 unsigned long flags; 574 struct sk_buff *frag, *next; 575 int len; 576 577 if (d->state != BT_CONNECTED) 578 return -ENOTCONN; 579 580 frag = skb_shinfo(skb)->frag_list; 581 skb_shinfo(skb)->frag_list = NULL; 582 583 /* Queue all fragments atomically. */ 584 spin_lock_irqsave(&d->tx_queue.lock, flags); 585 586 len = rfcomm_dlc_send_frag(d, skb); 587 if (len < 0 || !frag) 588 goto unlock; 589 590 for (; frag; frag = next) { 591 int ret; 592 593 next = frag->next; 594 595 ret = rfcomm_dlc_send_frag(d, frag); 596 if (ret < 0) { 597 dev_kfree_skb_irq(frag); 598 goto unlock; 599 } 600 601 len += ret; 602 } 603 604unlock: 605 spin_unlock_irqrestore(&d->tx_queue.lock, flags); 606 607 if (len > 0 && !test_bit(RFCOMM_TX_THROTTLED, &d->flags)) 608 rfcomm_schedule(); 609 return len; 610} 611 612void rfcomm_dlc_send_noerror(struct rfcomm_dlc *d, struct sk_buff *skb) 613{ 614 int len = skb->len; 615 616 BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len); 617 618 rfcomm_make_uih(skb, d->addr); 619 skb_queue_tail(&d->tx_queue, skb); 620 621 if (d->state == BT_CONNECTED && 622 !test_bit(RFCOMM_TX_THROTTLED, &d->flags)) 623 rfcomm_schedule(); 624} 625 626void __rfcomm_dlc_throttle(struct rfcomm_dlc *d) 627{ 628 BT_DBG("dlc %p state %ld", d, d->state); 629 630 if (!d->cfc) { 631 d->v24_sig |= RFCOMM_V24_FC; 632 set_bit(RFCOMM_MSC_PENDING, &d->flags); 633 } 634 rfcomm_schedule(); 635} 636 637void __rfcomm_dlc_unthrottle(struct rfcomm_dlc *d) 638{ 639 BT_DBG("dlc %p state %ld", d, d->state); 640 641 if (!d->cfc) { 642 d->v24_sig &= ~RFCOMM_V24_FC; 643 set_bit(RFCOMM_MSC_PENDING, &d->flags); 644 } 645 rfcomm_schedule(); 646} 647 648/* 649 Set/get modem status functions use _local_ status i.e. what we report 650 to the other side. 651 Remote status is provided by dlc->modem_status() callback. 652 */ 653int rfcomm_dlc_set_modem_status(struct rfcomm_dlc *d, u8 v24_sig) 654{ 655 BT_DBG("dlc %p state %ld v24_sig 0x%x", 656 d, d->state, v24_sig); 657 658 if (test_bit(RFCOMM_RX_THROTTLED, &d->flags)) 659 v24_sig |= RFCOMM_V24_FC; 660 else 661 v24_sig &= ~RFCOMM_V24_FC; 662 663 d->v24_sig = v24_sig; 664 665 if (!test_and_set_bit(RFCOMM_MSC_PENDING, &d->flags)) 666 rfcomm_schedule(); 667 668 return 0; 669} 670 671int rfcomm_dlc_get_modem_status(struct rfcomm_dlc *d, u8 *v24_sig) 672{ 673 BT_DBG("dlc %p state %ld v24_sig 0x%x", 674 d, d->state, d->v24_sig); 675 676 *v24_sig = d->v24_sig; 677 return 0; 678} 679 680/* ---- RFCOMM sessions ---- */ 681static struct rfcomm_session *rfcomm_session_add(struct socket *sock, int state) 682{ 683 struct rfcomm_session *s = kzalloc(sizeof(*s), GFP_KERNEL); 684 685 if (!s) 686 return NULL; 687 688 BT_DBG("session %p sock %p", s, sock); 689 690 timer_setup(&s->timer, rfcomm_session_timeout, 0); 691 692 INIT_LIST_HEAD(&s->dlcs); 693 s->state = state; 694 s->sock = sock; 695 696 s->mtu = RFCOMM_DEFAULT_MTU; 697 s->cfc = disable_cfc ? RFCOMM_CFC_DISABLED : RFCOMM_CFC_UNKNOWN; 698 699 /* Do not increment module usage count for listening sessions. 700 * Otherwise we won't be able to unload the module. */ 701 if (state != BT_LISTEN) 702 if (!try_module_get(THIS_MODULE)) { 703 kfree(s); 704 return NULL; 705 } 706 707 list_add(&s->list, &session_list); 708 709 return s; 710} 711 712static struct rfcomm_session *rfcomm_session_del(struct rfcomm_session *s) 713{ 714 int state = s->state; 715 716 BT_DBG("session %p state %ld", s, s->state); 717 718 list_del(&s->list); 719 720 rfcomm_session_clear_timer(s); 721 sock_release(s->sock); 722 kfree(s); 723 724 if (state != BT_LISTEN) 725 module_put(THIS_MODULE); 726 727 return NULL; 728} 729 730static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst) 731{ 732 struct rfcomm_session *s, *n; 733 struct l2cap_chan *chan; 734 list_for_each_entry_safe(s, n, &session_list, list) { 735 chan = l2cap_pi(s->sock->sk)->chan; 736 737 if ((!bacmp(src, BDADDR_ANY) || !bacmp(&chan->src, src)) && 738 !bacmp(&chan->dst, dst)) 739 return s; 740 } 741 return NULL; 742} 743 744static struct rfcomm_session *rfcomm_session_close(struct rfcomm_session *s, 745 int err) 746{ 747 struct rfcomm_dlc *d, *n; 748 749 s->state = BT_CLOSED; 750 751 BT_DBG("session %p state %ld err %d", s, s->state, err); 752 753 /* Close all dlcs */ 754 list_for_each_entry_safe(d, n, &s->dlcs, list) { 755 d->state = BT_CLOSED; 756 __rfcomm_dlc_close(d, err); 757 } 758 759 rfcomm_session_clear_timer(s); 760 return rfcomm_session_del(s); 761} 762 763static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src, 764 bdaddr_t *dst, 765 u8 sec_level, 766 int *err) 767{ 768 struct rfcomm_session *s = NULL; 769 struct sockaddr_l2 addr; 770 struct socket *sock; 771 struct sock *sk; 772 773 BT_DBG("%pMR -> %pMR", src, dst); 774 775 *err = rfcomm_l2sock_create(&sock); 776 if (*err < 0) 777 return NULL; 778 779 bacpy(&addr.l2_bdaddr, src); 780 addr.l2_family = AF_BLUETOOTH; 781 addr.l2_psm = 0; 782 addr.l2_cid = 0; 783 addr.l2_bdaddr_type = BDADDR_BREDR; 784 *err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr)); 785 if (*err < 0) 786 goto failed; 787 788 /* Set L2CAP options */ 789 sk = sock->sk; 790 lock_sock(sk); 791 /* Set MTU to 0 so L2CAP can auto select the MTU */ 792 l2cap_pi(sk)->chan->imtu = 0; 793 l2cap_pi(sk)->chan->sec_level = sec_level; 794 if (l2cap_ertm) 795 l2cap_pi(sk)->chan->mode = L2CAP_MODE_ERTM; 796 release_sock(sk); 797 798 s = rfcomm_session_add(sock, BT_BOUND); 799 if (!s) { 800 *err = -ENOMEM; 801 goto failed; 802 } 803 804 s->initiator = 1; 805 806 bacpy(&addr.l2_bdaddr, dst); 807 addr.l2_family = AF_BLUETOOTH; 808 addr.l2_psm = cpu_to_le16(L2CAP_PSM_RFCOMM); 809 addr.l2_cid = 0; 810 addr.l2_bdaddr_type = BDADDR_BREDR; 811 *err = kernel_connect(sock, (struct sockaddr *) &addr, sizeof(addr), O_NONBLOCK); 812 if (*err == 0 || *err == -EINPROGRESS) 813 return s; 814 815 return rfcomm_session_del(s); 816 817failed: 818 sock_release(sock); 819 return NULL; 820} 821 822void rfcomm_session_getaddr(struct rfcomm_session *s, bdaddr_t *src, bdaddr_t *dst) 823{ 824 struct l2cap_chan *chan = l2cap_pi(s->sock->sk)->chan; 825 if (src) 826 bacpy(src, &chan->src); 827 if (dst) 828 bacpy(dst, &chan->dst); 829} 830 831/* ---- RFCOMM frame sending ---- */ 832static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len) 833{ 834 struct kvec iv = { data, len }; 835 struct msghdr msg; 836 837 BT_DBG("session %p len %d", s, len); 838 839 memset(&msg, 0, sizeof(msg)); 840 841 return kernel_sendmsg(s->sock, &msg, &iv, 1, len); 842} 843 844static int rfcomm_send_cmd(struct rfcomm_session *s, struct rfcomm_cmd *cmd) 845{ 846 BT_DBG("%p cmd %u", s, cmd->ctrl); 847 848 return rfcomm_send_frame(s, (void *) cmd, sizeof(*cmd)); 849} 850 851static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci) 852{ 853 struct rfcomm_cmd cmd; 854 855 BT_DBG("%p dlci %d", s, dlci); 856 857 cmd.addr = __addr(s->initiator, dlci); 858 cmd.ctrl = __ctrl(RFCOMM_SABM, 1); 859 cmd.len = __len8(0); 860 cmd.fcs = __fcs2((u8 *) &cmd); 861 862 return rfcomm_send_cmd(s, &cmd); 863} 864 865static int rfcomm_send_ua(struct rfcomm_session *s, u8 dlci) 866{ 867 struct rfcomm_cmd cmd; 868 869 BT_DBG("%p dlci %d", s, dlci); 870 871 cmd.addr = __addr(!s->initiator, dlci); 872 cmd.ctrl = __ctrl(RFCOMM_UA, 1); 873 cmd.len = __len8(0); 874 cmd.fcs = __fcs2((u8 *) &cmd); 875 876 return rfcomm_send_cmd(s, &cmd); 877} 878 879static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci) 880{ 881 struct rfcomm_cmd cmd; 882 883 BT_DBG("%p dlci %d", s, dlci); 884 885 cmd.addr = __addr(s->initiator, dlci); 886 cmd.ctrl = __ctrl(RFCOMM_DISC, 1); 887 cmd.len = __len8(0); 888 cmd.fcs = __fcs2((u8 *) &cmd); 889 890 return rfcomm_send_cmd(s, &cmd); 891} 892 893static int rfcomm_queue_disc(struct rfcomm_dlc *d) 894{ 895 struct rfcomm_cmd *cmd; 896 struct sk_buff *skb; 897 898 BT_DBG("dlc %p dlci %d", d, d->dlci); 899 900 skb = alloc_skb(sizeof(*cmd), GFP_KERNEL); 901 if (!skb) 902 return -ENOMEM; 903 904 cmd = __skb_put(skb, sizeof(*cmd)); 905 cmd->addr = d->addr; 906 cmd->ctrl = __ctrl(RFCOMM_DISC, 1); 907 cmd->len = __len8(0); 908 cmd->fcs = __fcs2((u8 *) cmd); 909 910 skb_queue_tail(&d->tx_queue, skb); 911 rfcomm_schedule(); 912 return 0; 913} 914 915static int rfcomm_send_dm(struct rfcomm_session *s, u8 dlci) 916{ 917 struct rfcomm_cmd cmd; 918 919 BT_DBG("%p dlci %d", s, dlci); 920 921 cmd.addr = __addr(!s->initiator, dlci); 922 cmd.ctrl = __ctrl(RFCOMM_DM, 1); 923 cmd.len = __len8(0); 924 cmd.fcs = __fcs2((u8 *) &cmd); 925 926 return rfcomm_send_cmd(s, &cmd); 927} 928 929static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type) 930{ 931 struct rfcomm_hdr *hdr; 932 struct rfcomm_mcc *mcc; 933 u8 buf[16], *ptr = buf; 934 935 BT_DBG("%p cr %d type %d", s, cr, type); 936 937 hdr = (void *) ptr; ptr += sizeof(*hdr); 938 hdr->addr = __addr(s->initiator, 0); 939 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 940 hdr->len = __len8(sizeof(*mcc) + 1); 941 942 mcc = (void *) ptr; ptr += sizeof(*mcc); 943 mcc->type = __mcc_type(0, RFCOMM_NSC); 944 mcc->len = __len8(1); 945 946 /* Type that we didn't like */ 947 *ptr = __mcc_type(cr, type); ptr++; 948 949 *ptr = __fcs(buf); ptr++; 950 951 return rfcomm_send_frame(s, buf, ptr - buf); 952} 953 954static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d) 955{ 956 struct rfcomm_hdr *hdr; 957 struct rfcomm_mcc *mcc; 958 struct rfcomm_pn *pn; 959 u8 buf[16], *ptr = buf; 960 961 BT_DBG("%p cr %d dlci %d mtu %d", s, cr, d->dlci, d->mtu); 962 963 hdr = (void *) ptr; ptr += sizeof(*hdr); 964 hdr->addr = __addr(s->initiator, 0); 965 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 966 hdr->len = __len8(sizeof(*mcc) + sizeof(*pn)); 967 968 mcc = (void *) ptr; ptr += sizeof(*mcc); 969 mcc->type = __mcc_type(cr, RFCOMM_PN); 970 mcc->len = __len8(sizeof(*pn)); 971 972 pn = (void *) ptr; ptr += sizeof(*pn); 973 pn->dlci = d->dlci; 974 pn->priority = d->priority; 975 pn->ack_timer = 0; 976 pn->max_retrans = 0; 977 978 if (s->cfc) { 979 pn->flow_ctrl = cr ? 0xf0 : 0xe0; 980 pn->credits = RFCOMM_DEFAULT_CREDITS; 981 } else { 982 pn->flow_ctrl = 0; 983 pn->credits = 0; 984 } 985 986 if (cr && channel_mtu >= 0) 987 pn->mtu = cpu_to_le16(channel_mtu); 988 else 989 pn->mtu = cpu_to_le16(d->mtu); 990 991 *ptr = __fcs(buf); ptr++; 992 993 return rfcomm_send_frame(s, buf, ptr - buf); 994} 995 996int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci, 997 u8 bit_rate, u8 data_bits, u8 stop_bits, 998 u8 parity, u8 flow_ctrl_settings, 999 u8 xon_char, u8 xoff_char, u16 param_mask) 1000{ 1001 struct rfcomm_hdr *hdr; 1002 struct rfcomm_mcc *mcc; 1003 struct rfcomm_rpn *rpn; 1004 u8 buf[16], *ptr = buf; 1005 1006 BT_DBG("%p cr %d dlci %d bit_r 0x%x data_b 0x%x stop_b 0x%x parity 0x%x" 1007 " flwc_s 0x%x xon_c 0x%x xoff_c 0x%x p_mask 0x%x", 1008 s, cr, dlci, bit_rate, data_bits, stop_bits, parity, 1009 flow_ctrl_settings, xon_char, xoff_char, param_mask); 1010 1011 hdr = (void *) ptr; ptr += sizeof(*hdr); 1012 hdr->addr = __addr(s->initiator, 0); 1013 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 1014 hdr->len = __len8(sizeof(*mcc) + sizeof(*rpn)); 1015 1016 mcc = (void *) ptr; ptr += sizeof(*mcc); 1017 mcc->type = __mcc_type(cr, RFCOMM_RPN); 1018 mcc->len = __len8(sizeof(*rpn)); 1019 1020 rpn = (void *) ptr; ptr += sizeof(*rpn); 1021 rpn->dlci = __addr(1, dlci); 1022 rpn->bit_rate = bit_rate; 1023 rpn->line_settings = __rpn_line_settings(data_bits, stop_bits, parity); 1024 rpn->flow_ctrl = flow_ctrl_settings; 1025 rpn->xon_char = xon_char; 1026 rpn->xoff_char = xoff_char; 1027 rpn->param_mask = cpu_to_le16(param_mask); 1028 1029 *ptr = __fcs(buf); ptr++; 1030 1031 return rfcomm_send_frame(s, buf, ptr - buf); 1032} 1033 1034static int rfcomm_send_rls(struct rfcomm_session *s, int cr, u8 dlci, u8 status) 1035{ 1036 struct rfcomm_hdr *hdr; 1037 struct rfcomm_mcc *mcc; 1038 struct rfcomm_rls *rls; 1039 u8 buf[16], *ptr = buf; 1040 1041 BT_DBG("%p cr %d status 0x%x", s, cr, status); 1042 1043 hdr = (void *) ptr; ptr += sizeof(*hdr); 1044 hdr->addr = __addr(s->initiator, 0); 1045 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 1046 hdr->len = __len8(sizeof(*mcc) + sizeof(*rls)); 1047 1048 mcc = (void *) ptr; ptr += sizeof(*mcc); 1049 mcc->type = __mcc_type(cr, RFCOMM_RLS); 1050 mcc->len = __len8(sizeof(*rls)); 1051 1052 rls = (void *) ptr; ptr += sizeof(*rls); 1053 rls->dlci = __addr(1, dlci); 1054 rls->status = status; 1055 1056 *ptr = __fcs(buf); ptr++; 1057 1058 return rfcomm_send_frame(s, buf, ptr - buf); 1059} 1060 1061static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig) 1062{ 1063 struct rfcomm_hdr *hdr; 1064 struct rfcomm_mcc *mcc; 1065 struct rfcomm_msc *msc; 1066 u8 buf[16], *ptr = buf; 1067 1068 BT_DBG("%p cr %d v24 0x%x", s, cr, v24_sig); 1069 1070 hdr = (void *) ptr; ptr += sizeof(*hdr); 1071 hdr->addr = __addr(s->initiator, 0); 1072 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 1073 hdr->len = __len8(sizeof(*mcc) + sizeof(*msc)); 1074 1075 mcc = (void *) ptr; ptr += sizeof(*mcc); 1076 mcc->type = __mcc_type(cr, RFCOMM_MSC); 1077 mcc->len = __len8(sizeof(*msc)); 1078 1079 msc = (void *) ptr; ptr += sizeof(*msc); 1080 msc->dlci = __addr(1, dlci); 1081 msc->v24_sig = v24_sig | 0x01; 1082 1083 *ptr = __fcs(buf); ptr++; 1084 1085 return rfcomm_send_frame(s, buf, ptr - buf); 1086} 1087 1088static int rfcomm_send_fcoff(struct rfcomm_session *s, int cr) 1089{ 1090 struct rfcomm_hdr *hdr; 1091 struct rfcomm_mcc *mcc; 1092 u8 buf[16], *ptr = buf; 1093 1094 BT_DBG("%p cr %d", s, cr); 1095 1096 hdr = (void *) ptr; ptr += sizeof(*hdr); 1097 hdr->addr = __addr(s->initiator, 0); 1098 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 1099 hdr->len = __len8(sizeof(*mcc)); 1100 1101 mcc = (void *) ptr; ptr += sizeof(*mcc); 1102 mcc->type = __mcc_type(cr, RFCOMM_FCOFF); 1103 mcc->len = __len8(0); 1104 1105 *ptr = __fcs(buf); ptr++; 1106 1107 return rfcomm_send_frame(s, buf, ptr - buf); 1108} 1109 1110static int rfcomm_send_fcon(struct rfcomm_session *s, int cr) 1111{ 1112 struct rfcomm_hdr *hdr; 1113 struct rfcomm_mcc *mcc; 1114 u8 buf[16], *ptr = buf; 1115 1116 BT_DBG("%p cr %d", s, cr); 1117 1118 hdr = (void *) ptr; ptr += sizeof(*hdr); 1119 hdr->addr = __addr(s->initiator, 0); 1120 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 1121 hdr->len = __len8(sizeof(*mcc)); 1122 1123 mcc = (void *) ptr; ptr += sizeof(*mcc); 1124 mcc->type = __mcc_type(cr, RFCOMM_FCON); 1125 mcc->len = __len8(0); 1126 1127 *ptr = __fcs(buf); ptr++; 1128 1129 return rfcomm_send_frame(s, buf, ptr - buf); 1130} 1131 1132static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len) 1133{ 1134 struct socket *sock = s->sock; 1135 struct kvec iv[3]; 1136 struct msghdr msg; 1137 unsigned char hdr[5], crc[1]; 1138 1139 if (len > 125) 1140 return -EINVAL; 1141 1142 BT_DBG("%p cr %d", s, cr); 1143 1144 hdr[0] = __addr(s->initiator, 0); 1145 hdr[1] = __ctrl(RFCOMM_UIH, 0); 1146 hdr[2] = 0x01 | ((len + 2) << 1); 1147 hdr[3] = 0x01 | ((cr & 0x01) << 1) | (RFCOMM_TEST << 2); 1148 hdr[4] = 0x01 | (len << 1); 1149 1150 crc[0] = __fcs(hdr); 1151 1152 iv[0].iov_base = hdr; 1153 iv[0].iov_len = 5; 1154 iv[1].iov_base = pattern; 1155 iv[1].iov_len = len; 1156 iv[2].iov_base = crc; 1157 iv[2].iov_len = 1; 1158 1159 memset(&msg, 0, sizeof(msg)); 1160 1161 return kernel_sendmsg(sock, &msg, iv, 3, 6 + len); 1162} 1163 1164static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits) 1165{ 1166 struct rfcomm_hdr *hdr; 1167 u8 buf[16], *ptr = buf; 1168 1169 BT_DBG("%p addr %d credits %d", s, addr, credits); 1170 1171 hdr = (void *) ptr; ptr += sizeof(*hdr); 1172 hdr->addr = addr; 1173 hdr->ctrl = __ctrl(RFCOMM_UIH, 1); 1174 hdr->len = __len8(0); 1175 1176 *ptr = credits; ptr++; 1177 1178 *ptr = __fcs(buf); ptr++; 1179 1180 return rfcomm_send_frame(s, buf, ptr - buf); 1181} 1182 1183static void rfcomm_make_uih(struct sk_buff *skb, u8 addr) 1184{ 1185 struct rfcomm_hdr *hdr; 1186 int len = skb->len; 1187 u8 *crc; 1188 1189 if (len > 127) { 1190 hdr = skb_push(skb, 4); 1191 put_unaligned(cpu_to_le16(__len16(len)), (__le16 *) &hdr->len); 1192 } else { 1193 hdr = skb_push(skb, 3); 1194 hdr->len = __len8(len); 1195 } 1196 hdr->addr = addr; 1197 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 1198 1199 crc = skb_put(skb, 1); 1200 *crc = __fcs((void *) hdr); 1201} 1202 1203/* ---- RFCOMM frame reception ---- */ 1204static struct rfcomm_session *rfcomm_recv_ua(struct rfcomm_session *s, u8 dlci) 1205{ 1206 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); 1207 1208 if (dlci) { 1209 /* Data channel */ 1210 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci); 1211 if (!d) { 1212 rfcomm_send_dm(s, dlci); 1213 return s; 1214 } 1215 1216 switch (d->state) { 1217 case BT_CONNECT: 1218 rfcomm_dlc_clear_timer(d); 1219 1220 rfcomm_dlc_lock(d); 1221 d->state = BT_CONNECTED; 1222 d->state_change(d, 0); 1223 rfcomm_dlc_unlock(d); 1224 1225 rfcomm_send_msc(s, 1, dlci, d->v24_sig); 1226 break; 1227 1228 case BT_DISCONN: 1229 d->state = BT_CLOSED; 1230 __rfcomm_dlc_close(d, 0); 1231 1232 if (list_empty(&s->dlcs)) { 1233 s->state = BT_DISCONN; 1234 rfcomm_send_disc(s, 0); 1235 rfcomm_session_clear_timer(s); 1236 } 1237 1238 break; 1239 } 1240 } else { 1241 /* Control channel */ 1242 switch (s->state) { 1243 case BT_CONNECT: 1244 s->state = BT_CONNECTED; 1245 rfcomm_process_connect(s); 1246 break; 1247 1248 case BT_DISCONN: 1249 s = rfcomm_session_close(s, ECONNRESET); 1250 break; 1251 } 1252 } 1253 return s; 1254} 1255 1256static struct rfcomm_session *rfcomm_recv_dm(struct rfcomm_session *s, u8 dlci) 1257{ 1258 int err = 0; 1259 1260 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); 1261 1262 if (dlci) { 1263 /* Data DLC */ 1264 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci); 1265 if (d) { 1266 if (d->state == BT_CONNECT || d->state == BT_CONFIG) 1267 err = ECONNREFUSED; 1268 else 1269 err = ECONNRESET; 1270 1271 d->state = BT_CLOSED; 1272 __rfcomm_dlc_close(d, err); 1273 } 1274 } else { 1275 if (s->state == BT_CONNECT) 1276 err = ECONNREFUSED; 1277 else 1278 err = ECONNRESET; 1279 1280 s = rfcomm_session_close(s, err); 1281 } 1282 return s; 1283} 1284 1285static struct rfcomm_session *rfcomm_recv_disc(struct rfcomm_session *s, 1286 u8 dlci) 1287{ 1288 int err = 0; 1289 1290 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); 1291 1292 if (dlci) { 1293 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci); 1294 if (d) { 1295 rfcomm_send_ua(s, dlci); 1296 1297 if (d->state == BT_CONNECT || d->state == BT_CONFIG) 1298 err = ECONNREFUSED; 1299 else 1300 err = ECONNRESET; 1301 1302 d->state = BT_CLOSED; 1303 __rfcomm_dlc_close(d, err); 1304 } else 1305 rfcomm_send_dm(s, dlci); 1306 1307 } else { 1308 rfcomm_send_ua(s, 0); 1309 1310 if (s->state == BT_CONNECT) 1311 err = ECONNREFUSED; 1312 else 1313 err = ECONNRESET; 1314 1315 s = rfcomm_session_close(s, err); 1316 } 1317 return s; 1318} 1319 1320void rfcomm_dlc_accept(struct rfcomm_dlc *d) 1321{ 1322 struct sock *sk = d->session->sock->sk; 1323 struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn; 1324 1325 BT_DBG("dlc %p", d); 1326 1327 rfcomm_send_ua(d->session, d->dlci); 1328 1329 rfcomm_dlc_clear_timer(d); 1330 1331 rfcomm_dlc_lock(d); 1332 d->state = BT_CONNECTED; 1333 d->state_change(d, 0); 1334 rfcomm_dlc_unlock(d); 1335 1336 if (d->role_switch) 1337 hci_conn_switch_role(conn->hcon, 0x00); 1338 1339 rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig); 1340} 1341 1342static void rfcomm_check_accept(struct rfcomm_dlc *d) 1343{ 1344 if (rfcomm_check_security(d)) { 1345 if (d->defer_setup) { 1346 set_bit(RFCOMM_DEFER_SETUP, &d->flags); 1347 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); 1348 1349 rfcomm_dlc_lock(d); 1350 d->state = BT_CONNECT2; 1351 d->state_change(d, 0); 1352 rfcomm_dlc_unlock(d); 1353 } else 1354 rfcomm_dlc_accept(d); 1355 } else { 1356 set_bit(RFCOMM_AUTH_PENDING, &d->flags); 1357 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); 1358 } 1359} 1360 1361static int rfcomm_recv_sabm(struct rfcomm_session *s, u8 dlci) 1362{ 1363 struct rfcomm_dlc *d; 1364 u8 channel; 1365 1366 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); 1367 1368 if (!dlci) { 1369 rfcomm_send_ua(s, 0); 1370 1371 if (s->state == BT_OPEN) { 1372 s->state = BT_CONNECTED; 1373 rfcomm_process_connect(s); 1374 } 1375 return 0; 1376 } 1377 1378 /* Check if DLC exists */ 1379 d = rfcomm_dlc_get(s, dlci); 1380 if (d) { 1381 if (d->state == BT_OPEN) { 1382 /* DLC was previously opened by PN request */ 1383 rfcomm_check_accept(d); 1384 } 1385 return 0; 1386 } 1387 1388 /* Notify socket layer about incoming connection */ 1389 channel = __srv_channel(dlci); 1390 if (rfcomm_connect_ind(s, channel, &d)) { 1391 d->dlci = dlci; 1392 d->addr = __addr(s->initiator, dlci); 1393 rfcomm_dlc_link(s, d); 1394 1395 rfcomm_check_accept(d); 1396 } else { 1397 rfcomm_send_dm(s, dlci); 1398 } 1399 1400 return 0; 1401} 1402 1403static int rfcomm_apply_pn(struct rfcomm_dlc *d, int cr, struct rfcomm_pn *pn) 1404{ 1405 struct rfcomm_session *s = d->session; 1406 1407 BT_DBG("dlc %p state %ld dlci %d mtu %d fc 0x%x credits %d", 1408 d, d->state, d->dlci, pn->mtu, pn->flow_ctrl, pn->credits); 1409 1410 if ((pn->flow_ctrl == 0xf0 && s->cfc != RFCOMM_CFC_DISABLED) || 1411 pn->flow_ctrl == 0xe0) { 1412 d->cfc = RFCOMM_CFC_ENABLED; 1413 d->tx_credits = pn->credits; 1414 } else { 1415 d->cfc = RFCOMM_CFC_DISABLED; 1416 set_bit(RFCOMM_TX_THROTTLED, &d->flags); 1417 } 1418 1419 if (s->cfc == RFCOMM_CFC_UNKNOWN) 1420 s->cfc = d->cfc; 1421 1422 d->priority = pn->priority; 1423 1424 d->mtu = __le16_to_cpu(pn->mtu); 1425 1426 if (cr && d->mtu > s->mtu) 1427 d->mtu = s->mtu; 1428 1429 return 0; 1430} 1431 1432static int rfcomm_recv_pn(struct rfcomm_session *s, int cr, struct sk_buff *skb) 1433{ 1434 struct rfcomm_pn *pn = (void *) skb->data; 1435 struct rfcomm_dlc *d; 1436 u8 dlci = pn->dlci; 1437 1438 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); 1439 1440 if (!dlci) 1441 return 0; 1442 1443 d = rfcomm_dlc_get(s, dlci); 1444 if (d) { 1445 if (cr) { 1446 /* PN request */ 1447 rfcomm_apply_pn(d, cr, pn); 1448 rfcomm_send_pn(s, 0, d); 1449 } else { 1450 /* PN response */ 1451 switch (d->state) { 1452 case BT_CONFIG: 1453 rfcomm_apply_pn(d, cr, pn); 1454 1455 d->state = BT_CONNECT; 1456 rfcomm_send_sabm(s, d->dlci); 1457 break; 1458 } 1459 } 1460 } else { 1461 u8 channel = __srv_channel(dlci); 1462 1463 if (!cr) 1464 return 0; 1465 1466 /* PN request for non existing DLC. 1467 * Assume incoming connection. */ 1468 if (rfcomm_connect_ind(s, channel, &d)) { 1469 d->dlci = dlci; 1470 d->addr = __addr(s->initiator, dlci); 1471 rfcomm_dlc_link(s, d); 1472 1473 rfcomm_apply_pn(d, cr, pn); 1474 1475 d->state = BT_OPEN; 1476 rfcomm_send_pn(s, 0, d); 1477 } else { 1478 rfcomm_send_dm(s, dlci); 1479 } 1480 } 1481 return 0; 1482} 1483 1484static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_buff *skb) 1485{ 1486 struct rfcomm_rpn *rpn = (void *) skb->data; 1487 u8 dlci = __get_dlci(rpn->dlci); 1488 1489 u8 bit_rate = 0; 1490 u8 data_bits = 0; 1491 u8 stop_bits = 0; 1492 u8 parity = 0; 1493 u8 flow_ctrl = 0; 1494 u8 xon_char = 0; 1495 u8 xoff_char = 0; 1496 u16 rpn_mask = RFCOMM_RPN_PM_ALL; 1497 1498 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", 1499 dlci, cr, len, rpn->bit_rate, rpn->line_settings, rpn->flow_ctrl, 1500 rpn->xon_char, rpn->xoff_char, rpn->param_mask); 1501 1502 if (!cr) 1503 return 0; 1504 1505 if (len == 1) { 1506 /* This is a request, return default (according to ETSI TS 07.10) settings */ 1507 bit_rate = RFCOMM_RPN_BR_9600; 1508 data_bits = RFCOMM_RPN_DATA_8; 1509 stop_bits = RFCOMM_RPN_STOP_1; 1510 parity = RFCOMM_RPN_PARITY_NONE; 1511 flow_ctrl = RFCOMM_RPN_FLOW_NONE; 1512 xon_char = RFCOMM_RPN_XON_CHAR; 1513 xoff_char = RFCOMM_RPN_XOFF_CHAR; 1514 goto rpn_out; 1515 } 1516 1517 /* Check for sane values, ignore/accept bit_rate, 8 bits, 1 stop bit, 1518 * no parity, no flow control lines, normal XON/XOFF chars */ 1519 1520 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_BITRATE)) { 1521 bit_rate = rpn->bit_rate; 1522 if (bit_rate > RFCOMM_RPN_BR_230400) { 1523 BT_DBG("RPN bit rate mismatch 0x%x", bit_rate); 1524 bit_rate = RFCOMM_RPN_BR_9600; 1525 rpn_mask ^= RFCOMM_RPN_PM_BITRATE; 1526 } 1527 } 1528 1529 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_DATA)) { 1530 data_bits = __get_rpn_data_bits(rpn->line_settings); 1531 if (data_bits != RFCOMM_RPN_DATA_8) { 1532 BT_DBG("RPN data bits mismatch 0x%x", data_bits); 1533 data_bits = RFCOMM_RPN_DATA_8; 1534 rpn_mask ^= RFCOMM_RPN_PM_DATA; 1535 } 1536 } 1537 1538 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_STOP)) { 1539 stop_bits = __get_rpn_stop_bits(rpn->line_settings); 1540 if (stop_bits != RFCOMM_RPN_STOP_1) { 1541 BT_DBG("RPN stop bits mismatch 0x%x", stop_bits); 1542 stop_bits = RFCOMM_RPN_STOP_1; 1543 rpn_mask ^= RFCOMM_RPN_PM_STOP; 1544 } 1545 } 1546 1547 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_PARITY)) { 1548 parity = __get_rpn_parity(rpn->line_settings); 1549 if (parity != RFCOMM_RPN_PARITY_NONE) { 1550 BT_DBG("RPN parity mismatch 0x%x", parity); 1551 parity = RFCOMM_RPN_PARITY_NONE; 1552 rpn_mask ^= RFCOMM_RPN_PM_PARITY; 1553 } 1554 } 1555 1556 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_FLOW)) { 1557 flow_ctrl = rpn->flow_ctrl; 1558 if (flow_ctrl != RFCOMM_RPN_FLOW_NONE) { 1559 BT_DBG("RPN flow ctrl mismatch 0x%x", flow_ctrl); 1560 flow_ctrl = RFCOMM_RPN_FLOW_NONE; 1561 rpn_mask ^= RFCOMM_RPN_PM_FLOW; 1562 } 1563 } 1564 1565 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XON)) { 1566 xon_char = rpn->xon_char; 1567 if (xon_char != RFCOMM_RPN_XON_CHAR) { 1568 BT_DBG("RPN XON char mismatch 0x%x", xon_char); 1569 xon_char = RFCOMM_RPN_XON_CHAR; 1570 rpn_mask ^= RFCOMM_RPN_PM_XON; 1571 } 1572 } 1573 1574 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XOFF)) { 1575 xoff_char = rpn->xoff_char; 1576 if (xoff_char != RFCOMM_RPN_XOFF_CHAR) { 1577 BT_DBG("RPN XOFF char mismatch 0x%x", xoff_char); 1578 xoff_char = RFCOMM_RPN_XOFF_CHAR; 1579 rpn_mask ^= RFCOMM_RPN_PM_XOFF; 1580 } 1581 } 1582 1583rpn_out: 1584 rfcomm_send_rpn(s, 0, dlci, bit_rate, data_bits, stop_bits, 1585 parity, flow_ctrl, xon_char, xoff_char, rpn_mask); 1586 1587 return 0; 1588} 1589 1590static int rfcomm_recv_rls(struct rfcomm_session *s, int cr, struct sk_buff *skb) 1591{ 1592 struct rfcomm_rls *rls = (void *) skb->data; 1593 u8 dlci = __get_dlci(rls->dlci); 1594 1595 BT_DBG("dlci %d cr %d status 0x%x", dlci, cr, rls->status); 1596 1597 if (!cr) 1598 return 0; 1599 1600 /* We should probably do something with this information here. But 1601 * for now it's sufficient just to reply -- Bluetooth 1.1 says it's 1602 * mandatory to recognise and respond to RLS */ 1603 1604 rfcomm_send_rls(s, 0, dlci, rls->status); 1605 1606 return 0; 1607} 1608 1609static int rfcomm_recv_msc(struct rfcomm_session *s, int cr, struct sk_buff *skb) 1610{ 1611 struct rfcomm_msc *msc = (void *) skb->data; 1612 struct rfcomm_dlc *d; 1613 u8 dlci = __get_dlci(msc->dlci); 1614 1615 BT_DBG("dlci %d cr %d v24 0x%x", dlci, cr, msc->v24_sig); 1616 1617 d = rfcomm_dlc_get(s, dlci); 1618 if (!d) 1619 return 0; 1620 1621 if (cr) { 1622 if (msc->v24_sig & RFCOMM_V24_FC && !d->cfc) 1623 set_bit(RFCOMM_TX_THROTTLED, &d->flags); 1624 else 1625 clear_bit(RFCOMM_TX_THROTTLED, &d->flags); 1626 1627 rfcomm_dlc_lock(d); 1628 1629 d->remote_v24_sig = msc->v24_sig; 1630 1631 if (d->modem_status) 1632 d->modem_status(d, msc->v24_sig); 1633 1634 rfcomm_dlc_unlock(d); 1635 1636 rfcomm_send_msc(s, 0, dlci, msc->v24_sig); 1637 1638 d->mscex |= RFCOMM_MSCEX_RX; 1639 } else 1640 d->mscex |= RFCOMM_MSCEX_TX; 1641 1642 return 0; 1643} 1644 1645static int rfcomm_recv_mcc(struct rfcomm_session *s, struct sk_buff *skb) 1646{ 1647 struct rfcomm_mcc *mcc = (void *) skb->data; 1648 u8 type, cr, len; 1649 1650 cr = __test_cr(mcc->type); 1651 type = __get_mcc_type(mcc->type); 1652 len = __get_mcc_len(mcc->len); 1653 1654 BT_DBG("%p type 0x%x cr %d", s, type, cr); 1655 1656 skb_pull(skb, 2); 1657 1658 switch (type) { 1659 case RFCOMM_PN: 1660 rfcomm_recv_pn(s, cr, skb); 1661 break; 1662 1663 case RFCOMM_RPN: 1664 rfcomm_recv_rpn(s, cr, len, skb); 1665 break; 1666 1667 case RFCOMM_RLS: 1668 rfcomm_recv_rls(s, cr, skb); 1669 break; 1670 1671 case RFCOMM_MSC: 1672 rfcomm_recv_msc(s, cr, skb); 1673 break; 1674 1675 case RFCOMM_FCOFF: 1676 if (cr) { 1677 set_bit(RFCOMM_TX_THROTTLED, &s->flags); 1678 rfcomm_send_fcoff(s, 0); 1679 } 1680 break; 1681 1682 case RFCOMM_FCON: 1683 if (cr) { 1684 clear_bit(RFCOMM_TX_THROTTLED, &s->flags); 1685 rfcomm_send_fcon(s, 0); 1686 } 1687 break; 1688 1689 case RFCOMM_TEST: 1690 if (cr) 1691 rfcomm_send_test(s, 0, skb->data, skb->len); 1692 break; 1693 1694 case RFCOMM_NSC: 1695 break; 1696 1697 default: 1698 BT_ERR("Unknown control type 0x%02x", type); 1699 rfcomm_send_nsc(s, cr, type); 1700 break; 1701 } 1702 return 0; 1703} 1704 1705static int rfcomm_recv_data(struct rfcomm_session *s, u8 dlci, int pf, struct sk_buff *skb) 1706{ 1707 struct rfcomm_dlc *d; 1708 1709 BT_DBG("session %p state %ld dlci %d pf %d", s, s->state, dlci, pf); 1710 1711 d = rfcomm_dlc_get(s, dlci); 1712 if (!d) { 1713 rfcomm_send_dm(s, dlci); 1714 goto drop; 1715 } 1716 1717 if (pf && d->cfc) { 1718 u8 credits = *(u8 *) skb->data; skb_pull(skb, 1); 1719 1720 d->tx_credits += credits; 1721 if (d->tx_credits) 1722 clear_bit(RFCOMM_TX_THROTTLED, &d->flags); 1723 } 1724 1725 if (skb->len && d->state == BT_CONNECTED) { 1726 rfcomm_dlc_lock(d); 1727 d->rx_credits--; 1728 d->data_ready(d, skb); 1729 rfcomm_dlc_unlock(d); 1730 return 0; 1731 } 1732 1733drop: 1734 kfree_skb(skb); 1735 return 0; 1736} 1737 1738static struct rfcomm_session *rfcomm_recv_frame(struct rfcomm_session *s, 1739 struct sk_buff *skb) 1740{ 1741 struct rfcomm_hdr *hdr = (void *) skb->data; 1742 u8 type, dlci, fcs; 1743 1744 if (!s) { 1745 /* no session, so free socket data */ 1746 kfree_skb(skb); 1747 return s; 1748 } 1749 1750 dlci = __get_dlci(hdr->addr); 1751 type = __get_type(hdr->ctrl); 1752 1753 /* Trim FCS */ 1754 skb->len--; skb->tail--; 1755 fcs = *(u8 *)skb_tail_pointer(skb); 1756 1757 if (__check_fcs(skb->data, type, fcs)) { 1758 BT_ERR("bad checksum in packet"); 1759 kfree_skb(skb); 1760 return s; 1761 } 1762 1763 if (__test_ea(hdr->len)) 1764 skb_pull(skb, 3); 1765 else 1766 skb_pull(skb, 4); 1767 1768 switch (type) { 1769 case RFCOMM_SABM: 1770 if (__test_pf(hdr->ctrl)) 1771 rfcomm_recv_sabm(s, dlci); 1772 break; 1773 1774 case RFCOMM_DISC: 1775 if (__test_pf(hdr->ctrl)) 1776 s = rfcomm_recv_disc(s, dlci); 1777 break; 1778 1779 case RFCOMM_UA: 1780 if (__test_pf(hdr->ctrl)) 1781 s = rfcomm_recv_ua(s, dlci); 1782 break; 1783 1784 case RFCOMM_DM: 1785 s = rfcomm_recv_dm(s, dlci); 1786 break; 1787 1788 case RFCOMM_UIH: 1789 if (dlci) { 1790 rfcomm_recv_data(s, dlci, __test_pf(hdr->ctrl), skb); 1791 return s; 1792 } 1793 rfcomm_recv_mcc(s, skb); 1794 break; 1795 1796 default: 1797 BT_ERR("Unknown packet type 0x%02x", type); 1798 break; 1799 } 1800 kfree_skb(skb); 1801 return s; 1802} 1803 1804/* ---- Connection and data processing ---- */ 1805 1806static void rfcomm_process_connect(struct rfcomm_session *s) 1807{ 1808 struct rfcomm_dlc *d, *n; 1809 1810 BT_DBG("session %p state %ld", s, s->state); 1811 1812 list_for_each_entry_safe(d, n, &s->dlcs, list) { 1813 if (d->state == BT_CONFIG) { 1814 d->mtu = s->mtu; 1815 if (rfcomm_check_security(d)) { 1816 rfcomm_send_pn(s, 1, d); 1817 } else { 1818 set_bit(RFCOMM_AUTH_PENDING, &d->flags); 1819 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); 1820 } 1821 } 1822 } 1823} 1824 1825/* Send data queued for the DLC. 1826 * Return number of frames left in the queue. 1827 */ 1828static int rfcomm_process_tx(struct rfcomm_dlc *d) 1829{ 1830 struct sk_buff *skb; 1831 int err; 1832 1833 BT_DBG("dlc %p state %ld cfc %d rx_credits %d tx_credits %d", 1834 d, d->state, d->cfc, d->rx_credits, d->tx_credits); 1835 1836 /* Send pending MSC */ 1837 if (test_and_clear_bit(RFCOMM_MSC_PENDING, &d->flags)) 1838 rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig); 1839 1840 if (d->cfc) { 1841 /* CFC enabled. 1842 * Give them some credits */ 1843 if (!test_bit(RFCOMM_RX_THROTTLED, &d->flags) && 1844 d->rx_credits <= (d->cfc >> 2)) { 1845 rfcomm_send_credits(d->session, d->addr, d->cfc - d->rx_credits); 1846 d->rx_credits = d->cfc; 1847 } 1848 } else { 1849 /* CFC disabled. 1850 * Give ourselves some credits */ 1851 d->tx_credits = 5; 1852 } 1853 1854 if (test_bit(RFCOMM_TX_THROTTLED, &d->flags)) 1855 return skb_queue_len(&d->tx_queue); 1856 1857 while (d->tx_credits && (skb = skb_dequeue(&d->tx_queue))) { 1858 err = rfcomm_send_frame(d->session, skb->data, skb->len); 1859 if (err < 0) { 1860 skb_queue_head(&d->tx_queue, skb); 1861 break; 1862 } 1863 kfree_skb(skb); 1864 d->tx_credits--; 1865 } 1866 1867 if (d->cfc && !d->tx_credits) { 1868 /* We're out of TX credits. 1869 * Set TX_THROTTLED flag to avoid unnesary wakeups by dlc_send. */ 1870 set_bit(RFCOMM_TX_THROTTLED, &d->flags); 1871 } 1872 1873 return skb_queue_len(&d->tx_queue); 1874} 1875 1876static void rfcomm_process_dlcs(struct rfcomm_session *s) 1877{ 1878 struct rfcomm_dlc *d, *n; 1879 1880 BT_DBG("session %p state %ld", s, s->state); 1881 1882 list_for_each_entry_safe(d, n, &s->dlcs, list) { 1883 if (test_bit(RFCOMM_TIMED_OUT, &d->flags)) { 1884 __rfcomm_dlc_close(d, ETIMEDOUT); 1885 continue; 1886 } 1887 1888 if (test_bit(RFCOMM_ENC_DROP, &d->flags)) { 1889 __rfcomm_dlc_close(d, ECONNREFUSED); 1890 continue; 1891 } 1892 1893 if (test_and_clear_bit(RFCOMM_AUTH_ACCEPT, &d->flags)) { 1894 rfcomm_dlc_clear_timer(d); 1895 if (d->out) { 1896 rfcomm_send_pn(s, 1, d); 1897 rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT); 1898 } else { 1899 if (d->defer_setup) { 1900 set_bit(RFCOMM_DEFER_SETUP, &d->flags); 1901 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); 1902 1903 rfcomm_dlc_lock(d); 1904 d->state = BT_CONNECT2; 1905 d->state_change(d, 0); 1906 rfcomm_dlc_unlock(d); 1907 } else 1908 rfcomm_dlc_accept(d); 1909 } 1910 continue; 1911 } else if (test_and_clear_bit(RFCOMM_AUTH_REJECT, &d->flags)) { 1912 rfcomm_dlc_clear_timer(d); 1913 if (!d->out) 1914 rfcomm_send_dm(s, d->dlci); 1915 else 1916 d->state = BT_CLOSED; 1917 __rfcomm_dlc_close(d, ECONNREFUSED); 1918 continue; 1919 } 1920 1921 if (test_bit(RFCOMM_SEC_PENDING, &d->flags)) 1922 continue; 1923 1924 if (test_bit(RFCOMM_TX_THROTTLED, &s->flags)) 1925 continue; 1926 1927 if ((d->state == BT_CONNECTED || d->state == BT_DISCONN) && 1928 d->mscex == RFCOMM_MSCEX_OK) 1929 rfcomm_process_tx(d); 1930 } 1931} 1932 1933static struct rfcomm_session *rfcomm_process_rx(struct rfcomm_session *s) 1934{ 1935 struct socket *sock = s->sock; 1936 struct sock *sk = sock->sk; 1937 struct sk_buff *skb; 1938 1939 BT_DBG("session %p state %ld qlen %d", s, s->state, skb_queue_len(&sk->sk_receive_queue)); 1940 1941 /* Get data directly from socket receive queue without copying it. */ 1942 while ((skb = skb_dequeue(&sk->sk_receive_queue))) { 1943 skb_orphan(skb); 1944 if (!skb_linearize(skb) && sk->sk_state != BT_CLOSED) { 1945 s = rfcomm_recv_frame(s, skb); 1946 if (!s) 1947 break; 1948 } else { 1949 kfree_skb(skb); 1950 } 1951 } 1952 1953 if (s && (sk->sk_state == BT_CLOSED)) 1954 s = rfcomm_session_close(s, sk->sk_err); 1955 1956 return s; 1957} 1958 1959static void rfcomm_accept_connection(struct rfcomm_session *s) 1960{ 1961 struct socket *sock = s->sock, *nsock; 1962 int err; 1963 1964 /* Fast check for a new connection. 1965 * Avoids unnesesary socket allocations. */ 1966 if (list_empty(&bt_sk(sock->sk)->accept_q)) 1967 return; 1968 1969 BT_DBG("session %p", s); 1970 1971 err = kernel_accept(sock, &nsock, O_NONBLOCK); 1972 if (err < 0) 1973 return; 1974 1975 /* Set our callbacks */ 1976 nsock->sk->sk_data_ready = rfcomm_l2data_ready; 1977 nsock->sk->sk_state_change = rfcomm_l2state_change; 1978 1979 s = rfcomm_session_add(nsock, BT_OPEN); 1980 if (s) { 1981 /* We should adjust MTU on incoming sessions. 1982 * L2CAP MTU minus UIH header and FCS. */ 1983 s->mtu = min(l2cap_pi(nsock->sk)->chan->omtu, 1984 l2cap_pi(nsock->sk)->chan->imtu) - 5; 1985 1986 rfcomm_schedule(); 1987 } else 1988 sock_release(nsock); 1989} 1990 1991static struct rfcomm_session *rfcomm_check_connection(struct rfcomm_session *s) 1992{ 1993 struct sock *sk = s->sock->sk; 1994 1995 BT_DBG("%p state %ld", s, s->state); 1996 1997 switch (sk->sk_state) { 1998 case BT_CONNECTED: 1999 s->state = BT_CONNECT; 2000 2001 /* We can adjust MTU on outgoing sessions. 2002 * L2CAP MTU minus UIH header and FCS. */ 2003 s->mtu = min(l2cap_pi(sk)->chan->omtu, l2cap_pi(sk)->chan->imtu) - 5; 2004 2005 rfcomm_send_sabm(s, 0); 2006 break; 2007 2008 case BT_CLOSED: 2009 s = rfcomm_session_close(s, sk->sk_err); 2010 break; 2011 } 2012 return s; 2013} 2014 2015static void rfcomm_process_sessions(void) 2016{ 2017 struct rfcomm_session *s, *n; 2018 2019 rfcomm_lock(); 2020 2021 list_for_each_entry_safe(s, n, &session_list, list) { 2022 if (test_and_clear_bit(RFCOMM_TIMED_OUT, &s->flags)) { 2023 s->state = BT_DISCONN; 2024 rfcomm_send_disc(s, 0); 2025 continue; 2026 } 2027 2028 switch (s->state) { 2029 case BT_LISTEN: 2030 rfcomm_accept_connection(s); 2031 continue; 2032 2033 case BT_BOUND: 2034 s = rfcomm_check_connection(s); 2035 break; 2036 2037 default: 2038 s = rfcomm_process_rx(s); 2039 break; 2040 } 2041 2042 if (s) 2043 rfcomm_process_dlcs(s); 2044 } 2045 2046 rfcomm_unlock(); 2047} 2048 2049static int rfcomm_add_listener(bdaddr_t *ba) 2050{ 2051 struct sockaddr_l2 addr; 2052 struct socket *sock; 2053 struct sock *sk; 2054 struct rfcomm_session *s; 2055 int err = 0; 2056 2057 /* Create socket */ 2058 err = rfcomm_l2sock_create(&sock); 2059 if (err < 0) { 2060 BT_ERR("Create socket failed %d", err); 2061 return err; 2062 } 2063 2064 /* Bind socket */ 2065 bacpy(&addr.l2_bdaddr, ba); 2066 addr.l2_family = AF_BLUETOOTH; 2067 addr.l2_psm = cpu_to_le16(L2CAP_PSM_RFCOMM); 2068 addr.l2_cid = 0; 2069 addr.l2_bdaddr_type = BDADDR_BREDR; 2070 err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr)); 2071 if (err < 0) { 2072 BT_ERR("Bind failed %d", err); 2073 goto failed; 2074 } 2075 2076 /* Set L2CAP options */ 2077 sk = sock->sk; 2078 lock_sock(sk); 2079 /* Set MTU to 0 so L2CAP can auto select the MTU */ 2080 l2cap_pi(sk)->chan->imtu = 0; 2081 release_sock(sk); 2082 2083 /* Start listening on the socket */ 2084 err = kernel_listen(sock, 10); 2085 if (err) { 2086 BT_ERR("Listen failed %d", err); 2087 goto failed; 2088 } 2089 2090 /* Add listening session */ 2091 s = rfcomm_session_add(sock, BT_LISTEN); 2092 if (!s) { 2093 err = -ENOMEM; 2094 goto failed; 2095 } 2096 2097 return 0; 2098failed: 2099 sock_release(sock); 2100 return err; 2101} 2102 2103static void rfcomm_kill_listener(void) 2104{ 2105 struct rfcomm_session *s, *n; 2106 2107 BT_DBG(""); 2108 2109 list_for_each_entry_safe(s, n, &session_list, list) 2110 rfcomm_session_del(s); 2111} 2112 2113static int rfcomm_run(void *unused) 2114{ 2115 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2116 BT_DBG(""); 2117 2118 set_user_nice(current, -10); 2119 2120 rfcomm_add_listener(BDADDR_ANY); 2121 2122 add_wait_queue(&rfcomm_wq, &wait); 2123 while (!kthread_should_stop()) { 2124 2125 /* Process stuff */ 2126 rfcomm_process_sessions(); 2127 2128 wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); 2129 } 2130 remove_wait_queue(&rfcomm_wq, &wait); 2131 2132 rfcomm_kill_listener(); 2133 2134 return 0; 2135} 2136 2137static void rfcomm_security_cfm(struct hci_conn *conn, u8 status, u8 encrypt) 2138{ 2139 struct rfcomm_session *s; 2140 struct rfcomm_dlc *d, *n; 2141 2142 BT_DBG("conn %p status 0x%02x encrypt 0x%02x", conn, status, encrypt); 2143 2144 s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst); 2145 if (!s) 2146 return; 2147 2148 list_for_each_entry_safe(d, n, &s->dlcs, list) { 2149 if (test_and_clear_bit(RFCOMM_SEC_PENDING, &d->flags)) { 2150 rfcomm_dlc_clear_timer(d); 2151 if (status || encrypt == 0x00) { 2152 set_bit(RFCOMM_ENC_DROP, &d->flags); 2153 continue; 2154 } 2155 } 2156 2157 if (d->state == BT_CONNECTED && !status && encrypt == 0x00) { 2158 if (d->sec_level == BT_SECURITY_MEDIUM) { 2159 set_bit(RFCOMM_SEC_PENDING, &d->flags); 2160 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); 2161 continue; 2162 } else if (d->sec_level == BT_SECURITY_HIGH || 2163 d->sec_level == BT_SECURITY_FIPS) { 2164 set_bit(RFCOMM_ENC_DROP, &d->flags); 2165 continue; 2166 } 2167 } 2168 2169 if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags)) 2170 continue; 2171 2172 if (!status && hci_conn_check_secure(conn, d->sec_level)) 2173 set_bit(RFCOMM_AUTH_ACCEPT, &d->flags); 2174 else 2175 set_bit(RFCOMM_AUTH_REJECT, &d->flags); 2176 } 2177 2178 rfcomm_schedule(); 2179} 2180 2181static struct hci_cb rfcomm_cb = { 2182 .name = "RFCOMM", 2183 .security_cfm = rfcomm_security_cfm 2184}; 2185 2186static int rfcomm_dlc_debugfs_show(struct seq_file *f, void *x) 2187{ 2188 struct rfcomm_session *s; 2189 2190 rfcomm_lock(); 2191 2192 list_for_each_entry(s, &session_list, list) { 2193 struct l2cap_chan *chan = l2cap_pi(s->sock->sk)->chan; 2194 struct rfcomm_dlc *d; 2195 list_for_each_entry(d, &s->dlcs, list) { 2196 seq_printf(f, "%pMR %pMR %ld %d %d %d %d\n", 2197 &chan->src, &chan->dst, 2198 d->state, d->dlci, d->mtu, 2199 d->rx_credits, d->tx_credits); 2200 } 2201 } 2202 2203 rfcomm_unlock(); 2204 2205 return 0; 2206} 2207 2208DEFINE_SHOW_ATTRIBUTE(rfcomm_dlc_debugfs); 2209 2210static struct dentry *rfcomm_dlc_debugfs; 2211 2212/* ---- Initialization ---- */ 2213static int __init rfcomm_init(void) 2214{ 2215 int err; 2216 2217 hci_register_cb(&rfcomm_cb); 2218 2219 rfcomm_thread = kthread_run(rfcomm_run, NULL, "krfcommd"); 2220 if (IS_ERR(rfcomm_thread)) { 2221 err = PTR_ERR(rfcomm_thread); 2222 goto unregister; 2223 } 2224 2225 err = rfcomm_init_ttys(); 2226 if (err < 0) 2227 goto stop; 2228 2229 err = rfcomm_init_sockets(); 2230 if (err < 0) 2231 goto cleanup; 2232 2233 BT_INFO("RFCOMM ver %s", VERSION); 2234 2235 if (IS_ERR_OR_NULL(bt_debugfs)) 2236 return 0; 2237 2238 rfcomm_dlc_debugfs = debugfs_create_file("rfcomm_dlc", 0444, 2239 bt_debugfs, NULL, 2240 &rfcomm_dlc_debugfs_fops); 2241 2242 return 0; 2243 2244cleanup: 2245 rfcomm_cleanup_ttys(); 2246 2247stop: 2248 kthread_stop(rfcomm_thread); 2249 2250unregister: 2251 hci_unregister_cb(&rfcomm_cb); 2252 2253 return err; 2254} 2255 2256static void __exit rfcomm_exit(void) 2257{ 2258 debugfs_remove(rfcomm_dlc_debugfs); 2259 2260 hci_unregister_cb(&rfcomm_cb); 2261 2262 kthread_stop(rfcomm_thread); 2263 2264 rfcomm_cleanup_ttys(); 2265 2266 rfcomm_cleanup_sockets(); 2267} 2268 2269module_init(rfcomm_init); 2270module_exit(rfcomm_exit); 2271 2272module_param(disable_cfc, bool, 0644); 2273MODULE_PARM_DESC(disable_cfc, "Disable credit based flow control"); 2274 2275module_param(channel_mtu, int, 0644); 2276MODULE_PARM_DESC(channel_mtu, "Default MTU for the RFCOMM channel"); 2277 2278module_param(l2cap_ertm, bool, 0644); 2279MODULE_PARM_DESC(l2cap_ertm, "Use L2CAP ERTM mode for connection"); 2280 2281MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); 2282MODULE_DESCRIPTION("Bluetooth RFCOMM ver " VERSION); 2283MODULE_VERSION(VERSION); 2284MODULE_LICENSE("GPL"); 2285MODULE_ALIAS("bt-proto-3"); 2286