1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 RFCOMM implementation for Linux Bluetooth stack (BlueZ). 4 Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com> 5 Copyright (C) 2002 Marcel Holtmann <marcel@holtmann.org> 6 7 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 8 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 9 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. 10 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY 11 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 12 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 14 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 16 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 17 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 18 SOFTWARE IS DISCLAIMED. 19 */ 20 21 /* 22 * Bluetooth RFCOMM core. 23 */ 24 25 #include <linux/module.h> 26 #include <linux/debugfs.h> 27 #include <linux/kthread.h> 28 #include <linux/unaligned.h> 29 30 #include <net/bluetooth/bluetooth.h> 31 #include <net/bluetooth/hci_core.h> 32 #include <net/bluetooth/l2cap.h> 33 #include <net/bluetooth/rfcomm.h> 34 35 #include <trace/events/sock.h> 36 37 #define VERSION "1.11" 38 39 static bool disable_cfc; 40 static bool l2cap_ertm; 41 static int channel_mtu = -1; 42 43 static struct task_struct *rfcomm_thread; 44 45 static DEFINE_MUTEX(rfcomm_mutex); 46 #define rfcomm_lock() mutex_lock(&rfcomm_mutex) 47 #define rfcomm_unlock() mutex_unlock(&rfcomm_mutex) 48 49 50 static LIST_HEAD(session_list); 51 52 static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len); 53 static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci); 54 static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci); 55 static int rfcomm_queue_disc(struct rfcomm_dlc *d); 56 static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type); 57 static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d); 58 static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig); 59 static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len); 60 static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits); 61 static void rfcomm_make_uih(struct sk_buff *skb, u8 addr); 62 63 static void rfcomm_process_connect(struct rfcomm_session *s); 64 65 static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src, 66 bdaddr_t *dst, 67 u8 sec_level, 68 int *err); 69 static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst); 70 static struct rfcomm_session *rfcomm_session_del(struct rfcomm_session *s); 71 72 /* ---- RFCOMM frame parsing macros ---- */ 73 #define __get_dlci(b) ((b & 0xfc) >> 2) 74 #define __get_type(b) ((b & 0xef)) 75 76 #define __test_ea(b) ((b & 0x01)) 77 #define __test_cr(b) (!!(b & 0x02)) 78 #define __test_pf(b) (!!(b & 0x10)) 79 80 #define __session_dir(s) ((s)->initiator ? 0x00 : 0x01) 81 82 #define __addr(cr, dlci) (((dlci & 0x3f) << 2) | (cr << 1) | 0x01) 83 #define __ctrl(type, pf) (((type & 0xef) | (pf << 4))) 84 #define __dlci(dir, chn) (((chn & 0x1f) << 1) | dir) 85 #define __srv_channel(dlci) (dlci >> 1) 86 87 #define __len8(len) (((len) << 1) | 1) 88 #define __len16(len) ((len) << 1) 89 90 /* MCC macros */ 91 #define __mcc_type(cr, type) (((type << 2) | (cr << 1) | 0x01)) 92 #define __get_mcc_type(b) ((b & 0xfc) >> 2) 93 #define __get_mcc_len(b) ((b & 0xfe) >> 1) 94 95 /* RPN macros */ 96 #define __rpn_line_settings(data, stop, parity) ((data & 0x3) | ((stop & 0x1) << 2) | ((parity & 0x7) << 3)) 97 #define __get_rpn_data_bits(line) ((line) & 0x3) 98 #define __get_rpn_stop_bits(line) (((line) >> 2) & 0x1) 99 #define __get_rpn_parity(line) (((line) >> 3) & 0x7) 100 101 static DECLARE_WAIT_QUEUE_HEAD(rfcomm_wq); 102 103 static void rfcomm_schedule(void) 104 { 105 wake_up_all(&rfcomm_wq); 106 } 107 108 /* ---- RFCOMM FCS computation ---- */ 109 110 /* reversed, 8-bit, poly=0x07 */ 111 static unsigned char rfcomm_crc_table[256] = { 112 0x00, 0x91, 0xe3, 0x72, 0x07, 0x96, 0xe4, 0x75, 113 0x0e, 0x9f, 0xed, 0x7c, 0x09, 0x98, 0xea, 0x7b, 114 0x1c, 0x8d, 0xff, 0x6e, 0x1b, 0x8a, 0xf8, 0x69, 115 0x12, 0x83, 0xf1, 0x60, 0x15, 0x84, 0xf6, 0x67, 116 117 0x38, 0xa9, 0xdb, 0x4a, 0x3f, 0xae, 0xdc, 0x4d, 118 0x36, 0xa7, 0xd5, 0x44, 0x31, 0xa0, 0xd2, 0x43, 119 0x24, 0xb5, 0xc7, 0x56, 0x23, 0xb2, 0xc0, 0x51, 120 0x2a, 0xbb, 0xc9, 0x58, 0x2d, 0xbc, 0xce, 0x5f, 121 122 0x70, 0xe1, 0x93, 0x02, 0x77, 0xe6, 0x94, 0x05, 123 0x7e, 0xef, 0x9d, 0x0c, 0x79, 0xe8, 0x9a, 0x0b, 124 0x6c, 0xfd, 0x8f, 0x1e, 0x6b, 0xfa, 0x88, 0x19, 125 0x62, 0xf3, 0x81, 0x10, 0x65, 0xf4, 0x86, 0x17, 126 127 0x48, 0xd9, 0xab, 0x3a, 0x4f, 0xde, 0xac, 0x3d, 128 0x46, 0xd7, 0xa5, 0x34, 0x41, 0xd0, 0xa2, 0x33, 129 0x54, 0xc5, 0xb7, 0x26, 0x53, 0xc2, 0xb0, 0x21, 130 0x5a, 0xcb, 0xb9, 0x28, 0x5d, 0xcc, 0xbe, 0x2f, 131 132 0xe0, 0x71, 0x03, 0x92, 0xe7, 0x76, 0x04, 0x95, 133 0xee, 0x7f, 0x0d, 0x9c, 0xe9, 0x78, 0x0a, 0x9b, 134 0xfc, 0x6d, 0x1f, 0x8e, 0xfb, 0x6a, 0x18, 0x89, 135 0xf2, 0x63, 0x11, 0x80, 0xf5, 0x64, 0x16, 0x87, 136 137 0xd8, 0x49, 0x3b, 0xaa, 0xdf, 0x4e, 0x3c, 0xad, 138 0xd6, 0x47, 0x35, 0xa4, 0xd1, 0x40, 0x32, 0xa3, 139 0xc4, 0x55, 0x27, 0xb6, 0xc3, 0x52, 0x20, 0xb1, 140 0xca, 0x5b, 0x29, 0xb8, 0xcd, 0x5c, 0x2e, 0xbf, 141 142 0x90, 0x01, 0x73, 0xe2, 0x97, 0x06, 0x74, 0xe5, 143 0x9e, 0x0f, 0x7d, 0xec, 0x99, 0x08, 0x7a, 0xeb, 144 0x8c, 0x1d, 0x6f, 0xfe, 0x8b, 0x1a, 0x68, 0xf9, 145 0x82, 0x13, 0x61, 0xf0, 0x85, 0x14, 0x66, 0xf7, 146 147 0xa8, 0x39, 0x4b, 0xda, 0xaf, 0x3e, 0x4c, 0xdd, 148 0xa6, 0x37, 0x45, 0xd4, 0xa1, 0x30, 0x42, 0xd3, 149 0xb4, 0x25, 0x57, 0xc6, 0xb3, 0x22, 0x50, 0xc1, 150 0xba, 0x2b, 0x59, 0xc8, 0xbd, 0x2c, 0x5e, 0xcf 151 }; 152 153 /* CRC on 2 bytes */ 154 #define __crc(data) (rfcomm_crc_table[rfcomm_crc_table[0xff ^ data[0]] ^ data[1]]) 155 156 /* FCS on 2 bytes */ 157 static inline u8 __fcs(u8 *data) 158 { 159 return 0xff - __crc(data); 160 } 161 162 /* FCS on 3 bytes */ 163 static inline u8 __fcs2(u8 *data) 164 { 165 return 0xff - rfcomm_crc_table[__crc(data) ^ data[2]]; 166 } 167 168 /* Check FCS */ 169 static inline int __check_fcs(u8 *data, int type, u8 fcs) 170 { 171 u8 f = __crc(data); 172 173 if (type != RFCOMM_UIH) 174 f = rfcomm_crc_table[f ^ data[2]]; 175 176 return rfcomm_crc_table[f ^ fcs] != 0xcf; 177 } 178 179 /* ---- L2CAP callbacks ---- */ 180 static void rfcomm_l2state_change(struct sock *sk) 181 { 182 BT_DBG("%p state %d", sk, sk->sk_state); 183 rfcomm_schedule(); 184 } 185 186 static void rfcomm_l2data_ready(struct sock *sk) 187 { 188 trace_sk_data_ready(sk); 189 190 BT_DBG("%p", sk); 191 rfcomm_schedule(); 192 } 193 194 static int rfcomm_l2sock_create(struct socket **sock) 195 { 196 int err; 197 198 BT_DBG(""); 199 200 err = sock_create_kern(&init_net, PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP, sock); 201 if (!err) { 202 struct sock *sk = (*sock)->sk; 203 sk->sk_data_ready = rfcomm_l2data_ready; 204 sk->sk_state_change = rfcomm_l2state_change; 205 } 206 return err; 207 } 208 209 static int rfcomm_check_security(struct rfcomm_dlc *d) 210 { 211 struct sock *sk = d->session->sock->sk; 212 struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn; 213 214 __u8 auth_type; 215 216 switch (d->sec_level) { 217 case BT_SECURITY_HIGH: 218 case BT_SECURITY_FIPS: 219 auth_type = HCI_AT_GENERAL_BONDING_MITM; 220 break; 221 case BT_SECURITY_MEDIUM: 222 auth_type = HCI_AT_GENERAL_BONDING; 223 break; 224 default: 225 auth_type = HCI_AT_NO_BONDING; 226 break; 227 } 228 229 return hci_conn_security(conn->hcon, d->sec_level, auth_type, 230 d->out); 231 } 232 233 static void rfcomm_session_timeout(struct timer_list *t) 234 { 235 struct rfcomm_session *s = timer_container_of(s, t, timer); 236 237 BT_DBG("session %p state %ld", s, s->state); 238 239 set_bit(RFCOMM_TIMED_OUT, &s->flags); 240 rfcomm_schedule(); 241 } 242 243 static void rfcomm_session_set_timer(struct rfcomm_session *s, long timeout) 244 { 245 BT_DBG("session %p state %ld timeout %ld", s, s->state, timeout); 246 247 mod_timer(&s->timer, jiffies + timeout); 248 } 249 250 static void rfcomm_session_clear_timer(struct rfcomm_session *s) 251 { 252 BT_DBG("session %p state %ld", s, s->state); 253 254 timer_delete_sync(&s->timer); 255 } 256 257 /* ---- RFCOMM DLCs ---- */ 258 static void rfcomm_dlc_timeout(struct timer_list *t) 259 { 260 struct rfcomm_dlc *d = timer_container_of(d, t, timer); 261 262 BT_DBG("dlc %p state %ld", d, d->state); 263 264 set_bit(RFCOMM_TIMED_OUT, &d->flags); 265 rfcomm_dlc_put(d); 266 rfcomm_schedule(); 267 } 268 269 static void rfcomm_dlc_set_timer(struct rfcomm_dlc *d, long timeout) 270 { 271 BT_DBG("dlc %p state %ld timeout %ld", d, d->state, timeout); 272 273 if (!mod_timer(&d->timer, jiffies + timeout)) 274 rfcomm_dlc_hold(d); 275 } 276 277 static void rfcomm_dlc_clear_timer(struct rfcomm_dlc *d) 278 { 279 BT_DBG("dlc %p state %ld", d, d->state); 280 281 if (timer_delete(&d->timer)) 282 rfcomm_dlc_put(d); 283 } 284 285 static void rfcomm_dlc_clear_state(struct rfcomm_dlc *d) 286 { 287 BT_DBG("%p", d); 288 289 d->state = BT_OPEN; 290 d->flags = 0; 291 d->mscex = 0; 292 d->sec_level = BT_SECURITY_LOW; 293 d->mtu = RFCOMM_DEFAULT_MTU; 294 d->v24_sig = RFCOMM_V24_RTC | RFCOMM_V24_RTR | RFCOMM_V24_DV; 295 296 d->cfc = RFCOMM_CFC_DISABLED; 297 d->rx_credits = RFCOMM_DEFAULT_CREDITS; 298 } 299 300 struct rfcomm_dlc *rfcomm_dlc_alloc(gfp_t prio) 301 { 302 struct rfcomm_dlc *d = kzalloc_obj(*d, prio); 303 304 if (!d) 305 return NULL; 306 307 timer_setup(&d->timer, rfcomm_dlc_timeout, 0); 308 309 skb_queue_head_init(&d->tx_queue); 310 mutex_init(&d->lock); 311 refcount_set(&d->refcnt, 1); 312 313 rfcomm_dlc_clear_state(d); 314 315 BT_DBG("%p", d); 316 317 return d; 318 } 319 320 void rfcomm_dlc_free(struct rfcomm_dlc *d) 321 { 322 BT_DBG("%p", d); 323 324 skb_queue_purge(&d->tx_queue); 325 kfree(d); 326 } 327 328 static void rfcomm_dlc_link(struct rfcomm_session *s, struct rfcomm_dlc *d) 329 { 330 BT_DBG("dlc %p session %p", d, s); 331 332 rfcomm_session_clear_timer(s); 333 rfcomm_dlc_hold(d); 334 list_add(&d->list, &s->dlcs); 335 d->session = s; 336 } 337 338 static void rfcomm_dlc_unlink(struct rfcomm_dlc *d) 339 { 340 struct rfcomm_session *s = d->session; 341 342 BT_DBG("dlc %p refcnt %d session %p", d, refcount_read(&d->refcnt), s); 343 344 list_del(&d->list); 345 d->session = NULL; 346 rfcomm_dlc_put(d); 347 348 if (list_empty(&s->dlcs)) 349 rfcomm_session_set_timer(s, RFCOMM_IDLE_TIMEOUT); 350 } 351 352 static struct rfcomm_dlc *rfcomm_dlc_get(struct rfcomm_session *s, u8 dlci) 353 { 354 struct rfcomm_dlc *d; 355 356 list_for_each_entry(d, &s->dlcs, list) 357 if (d->dlci == dlci) 358 return d; 359 360 return NULL; 361 } 362 363 static int rfcomm_check_channel(u8 channel) 364 { 365 return channel < 1 || channel > 30; 366 } 367 368 static int __rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel) 369 { 370 struct rfcomm_session *s; 371 int err = 0; 372 u8 dlci; 373 374 BT_DBG("dlc %p state %ld %pMR -> %pMR channel %d", 375 d, d->state, src, dst, channel); 376 377 if (rfcomm_check_channel(channel)) 378 return -EINVAL; 379 380 if (d->state != BT_OPEN && d->state != BT_CLOSED) 381 return 0; 382 383 s = rfcomm_session_get(src, dst); 384 if (!s) { 385 s = rfcomm_session_create(src, dst, d->sec_level, &err); 386 if (!s) 387 return err; 388 } 389 390 dlci = __dlci(__session_dir(s), channel); 391 392 /* Check if DLCI already exists */ 393 if (rfcomm_dlc_get(s, dlci)) 394 return -EBUSY; 395 396 rfcomm_dlc_clear_state(d); 397 398 d->dlci = dlci; 399 d->addr = __addr(s->initiator, dlci); 400 d->priority = 7; 401 402 d->state = BT_CONFIG; 403 rfcomm_dlc_link(s, d); 404 405 d->out = 1; 406 407 d->mtu = s->mtu; 408 d->cfc = (s->cfc == RFCOMM_CFC_UNKNOWN) ? 0 : s->cfc; 409 410 if (s->state == BT_CONNECTED) { 411 if (rfcomm_check_security(d)) 412 rfcomm_send_pn(s, 1, d); 413 else 414 set_bit(RFCOMM_AUTH_PENDING, &d->flags); 415 } 416 417 rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT); 418 419 return 0; 420 } 421 422 int rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel) 423 { 424 int r; 425 426 rfcomm_lock(); 427 428 r = __rfcomm_dlc_open(d, src, dst, channel); 429 430 rfcomm_unlock(); 431 return r; 432 } 433 434 static void __rfcomm_dlc_disconn(struct rfcomm_dlc *d) 435 { 436 struct rfcomm_session *s = d->session; 437 438 d->state = BT_DISCONN; 439 if (skb_queue_empty(&d->tx_queue)) { 440 rfcomm_send_disc(s, d->dlci); 441 rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT); 442 } else { 443 rfcomm_queue_disc(d); 444 rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT * 2); 445 } 446 } 447 448 static int __rfcomm_dlc_close(struct rfcomm_dlc *d, int err) 449 { 450 struct rfcomm_session *s = d->session; 451 if (!s) 452 return 0; 453 454 BT_DBG("dlc %p state %ld dlci %d err %d session %p", 455 d, d->state, d->dlci, err, s); 456 457 switch (d->state) { 458 case BT_CONNECT: 459 case BT_CONFIG: 460 case BT_OPEN: 461 case BT_CONNECT2: 462 if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) { 463 set_bit(RFCOMM_AUTH_REJECT, &d->flags); 464 rfcomm_schedule(); 465 return 0; 466 } 467 } 468 469 switch (d->state) { 470 case BT_CONNECT: 471 case BT_CONNECTED: 472 __rfcomm_dlc_disconn(d); 473 break; 474 475 case BT_CONFIG: 476 if (s->state != BT_BOUND) { 477 __rfcomm_dlc_disconn(d); 478 break; 479 } 480 /* if closing a dlc in a session that hasn't been started, 481 * just close and unlink the dlc 482 */ 483 fallthrough; 484 485 default: 486 rfcomm_dlc_clear_timer(d); 487 488 rfcomm_dlc_lock(d); 489 d->state = BT_CLOSED; 490 d->state_change(d, err); 491 rfcomm_dlc_unlock(d); 492 493 skb_queue_purge(&d->tx_queue); 494 rfcomm_dlc_unlink(d); 495 } 496 497 return 0; 498 } 499 500 int rfcomm_dlc_close(struct rfcomm_dlc *d, int err) 501 { 502 int r = 0; 503 struct rfcomm_dlc *d_list; 504 struct rfcomm_session *s, *s_list; 505 506 BT_DBG("dlc %p state %ld dlci %d err %d", d, d->state, d->dlci, err); 507 508 rfcomm_lock(); 509 510 s = d->session; 511 if (!s) 512 goto no_session; 513 514 /* after waiting on the mutex check the session still exists 515 * then check the dlc still exists 516 */ 517 list_for_each_entry(s_list, &session_list, list) { 518 if (s_list == s) { 519 list_for_each_entry(d_list, &s->dlcs, list) { 520 if (d_list == d) { 521 r = __rfcomm_dlc_close(d, err); 522 break; 523 } 524 } 525 break; 526 } 527 } 528 529 no_session: 530 rfcomm_unlock(); 531 return r; 532 } 533 534 struct rfcomm_dlc *rfcomm_dlc_exists(bdaddr_t *src, bdaddr_t *dst, u8 channel) 535 { 536 struct rfcomm_session *s; 537 struct rfcomm_dlc *dlc = NULL; 538 u8 dlci; 539 540 if (rfcomm_check_channel(channel)) 541 return ERR_PTR(-EINVAL); 542 543 rfcomm_lock(); 544 s = rfcomm_session_get(src, dst); 545 if (s) { 546 dlci = __dlci(__session_dir(s), channel); 547 dlc = rfcomm_dlc_get(s, dlci); 548 } 549 rfcomm_unlock(); 550 return dlc; 551 } 552 553 static int rfcomm_dlc_send_frag(struct rfcomm_dlc *d, struct sk_buff *frag) 554 { 555 int len = frag->len; 556 557 BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len); 558 559 if (len > d->mtu) 560 return -EINVAL; 561 562 rfcomm_make_uih(frag, d->addr); 563 __skb_queue_tail(&d->tx_queue, frag); 564 565 return len; 566 } 567 568 int rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb) 569 { 570 unsigned long flags; 571 struct sk_buff *frag, *next; 572 int len; 573 574 if (d->state != BT_CONNECTED) 575 return -ENOTCONN; 576 577 frag = skb_shinfo(skb)->frag_list; 578 skb_shinfo(skb)->frag_list = NULL; 579 580 /* Queue all fragments atomically. */ 581 spin_lock_irqsave(&d->tx_queue.lock, flags); 582 583 len = rfcomm_dlc_send_frag(d, skb); 584 if (len < 0 || !frag) 585 goto unlock; 586 587 for (; frag; frag = next) { 588 int ret; 589 590 next = frag->next; 591 592 ret = rfcomm_dlc_send_frag(d, frag); 593 if (ret < 0) { 594 dev_kfree_skb_irq(frag); 595 goto unlock; 596 } 597 598 len += ret; 599 } 600 601 unlock: 602 spin_unlock_irqrestore(&d->tx_queue.lock, flags); 603 604 if (len > 0 && !test_bit(RFCOMM_TX_THROTTLED, &d->flags)) 605 rfcomm_schedule(); 606 return len; 607 } 608 609 void rfcomm_dlc_send_noerror(struct rfcomm_dlc *d, struct sk_buff *skb) 610 { 611 int len = skb->len; 612 613 BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len); 614 615 rfcomm_make_uih(skb, d->addr); 616 skb_queue_tail(&d->tx_queue, skb); 617 618 if (d->state == BT_CONNECTED && 619 !test_bit(RFCOMM_TX_THROTTLED, &d->flags)) 620 rfcomm_schedule(); 621 } 622 623 void __rfcomm_dlc_throttle(struct rfcomm_dlc *d) 624 { 625 BT_DBG("dlc %p state %ld", d, d->state); 626 627 if (!d->cfc) { 628 d->v24_sig |= RFCOMM_V24_FC; 629 set_bit(RFCOMM_MSC_PENDING, &d->flags); 630 } 631 rfcomm_schedule(); 632 } 633 634 void __rfcomm_dlc_unthrottle(struct rfcomm_dlc *d) 635 { 636 BT_DBG("dlc %p state %ld", d, d->state); 637 638 if (!d->cfc) { 639 d->v24_sig &= ~RFCOMM_V24_FC; 640 set_bit(RFCOMM_MSC_PENDING, &d->flags); 641 } 642 rfcomm_schedule(); 643 } 644 645 /* 646 Set/get modem status functions use _local_ status i.e. what we report 647 to the other side. 648 Remote status is provided by dlc->modem_status() callback. 649 */ 650 int rfcomm_dlc_set_modem_status(struct rfcomm_dlc *d, u8 v24_sig) 651 { 652 BT_DBG("dlc %p state %ld v24_sig 0x%x", 653 d, d->state, v24_sig); 654 655 if (test_bit(RFCOMM_RX_THROTTLED, &d->flags)) 656 v24_sig |= RFCOMM_V24_FC; 657 else 658 v24_sig &= ~RFCOMM_V24_FC; 659 660 d->v24_sig = v24_sig; 661 662 if (!test_and_set_bit(RFCOMM_MSC_PENDING, &d->flags)) 663 rfcomm_schedule(); 664 665 return 0; 666 } 667 668 int rfcomm_dlc_get_modem_status(struct rfcomm_dlc *d, u8 *v24_sig) 669 { 670 BT_DBG("dlc %p state %ld v24_sig 0x%x", 671 d, d->state, d->v24_sig); 672 673 *v24_sig = d->v24_sig; 674 return 0; 675 } 676 677 /* ---- RFCOMM sessions ---- */ 678 static struct rfcomm_session *rfcomm_session_add(struct socket *sock, int state) 679 { 680 struct rfcomm_session *s = kzalloc_obj(*s); 681 682 if (!s) 683 return NULL; 684 685 BT_DBG("session %p sock %p", s, sock); 686 687 timer_setup(&s->timer, rfcomm_session_timeout, 0); 688 689 INIT_LIST_HEAD(&s->dlcs); 690 s->state = state; 691 s->sock = sock; 692 693 s->mtu = RFCOMM_DEFAULT_MTU; 694 s->cfc = disable_cfc ? RFCOMM_CFC_DISABLED : RFCOMM_CFC_UNKNOWN; 695 696 /* Do not increment module usage count for listening sessions. 697 * Otherwise we won't be able to unload the module. */ 698 if (state != BT_LISTEN) 699 if (!try_module_get(THIS_MODULE)) { 700 kfree(s); 701 return NULL; 702 } 703 704 list_add(&s->list, &session_list); 705 706 return s; 707 } 708 709 static struct rfcomm_session *rfcomm_session_del(struct rfcomm_session *s) 710 { 711 int state = s->state; 712 713 BT_DBG("session %p state %ld", s, s->state); 714 715 list_del(&s->list); 716 717 rfcomm_session_clear_timer(s); 718 sock_release(s->sock); 719 kfree(s); 720 721 if (state != BT_LISTEN) 722 module_put(THIS_MODULE); 723 724 return NULL; 725 } 726 727 static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst) 728 { 729 struct rfcomm_session *s, *n; 730 struct l2cap_chan *chan; 731 list_for_each_entry_safe(s, n, &session_list, list) { 732 chan = l2cap_pi(s->sock->sk)->chan; 733 734 if ((!bacmp(src, BDADDR_ANY) || !bacmp(&chan->src, src)) && 735 !bacmp(&chan->dst, dst)) 736 return s; 737 } 738 return NULL; 739 } 740 741 static struct rfcomm_session *rfcomm_session_close(struct rfcomm_session *s, 742 int err) 743 { 744 struct rfcomm_dlc *d, *n; 745 746 s->state = BT_CLOSED; 747 748 BT_DBG("session %p state %ld err %d", s, s->state, err); 749 750 /* Close all dlcs */ 751 list_for_each_entry_safe(d, n, &s->dlcs, list) { 752 d->state = BT_CLOSED; 753 __rfcomm_dlc_close(d, err); 754 } 755 756 rfcomm_session_clear_timer(s); 757 return rfcomm_session_del(s); 758 } 759 760 static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src, 761 bdaddr_t *dst, 762 u8 sec_level, 763 int *err) 764 { 765 struct rfcomm_session *s = NULL; 766 struct sockaddr_l2 addr; 767 struct socket *sock; 768 struct sock *sk; 769 770 BT_DBG("%pMR -> %pMR", src, dst); 771 772 *err = rfcomm_l2sock_create(&sock); 773 if (*err < 0) 774 return NULL; 775 776 bacpy(&addr.l2_bdaddr, src); 777 addr.l2_family = AF_BLUETOOTH; 778 addr.l2_psm = 0; 779 addr.l2_cid = 0; 780 addr.l2_bdaddr_type = BDADDR_BREDR; 781 *err = kernel_bind(sock, (struct sockaddr_unsized *)&addr, sizeof(addr)); 782 if (*err < 0) 783 goto failed; 784 785 /* Set L2CAP options */ 786 sk = sock->sk; 787 lock_sock(sk); 788 /* Set MTU to 0 so L2CAP can auto select the MTU */ 789 l2cap_pi(sk)->chan->imtu = 0; 790 l2cap_pi(sk)->chan->sec_level = sec_level; 791 if (l2cap_ertm) 792 l2cap_pi(sk)->chan->mode = L2CAP_MODE_ERTM; 793 release_sock(sk); 794 795 s = rfcomm_session_add(sock, BT_BOUND); 796 if (!s) { 797 *err = -ENOMEM; 798 goto failed; 799 } 800 801 s->initiator = 1; 802 803 bacpy(&addr.l2_bdaddr, dst); 804 addr.l2_family = AF_BLUETOOTH; 805 addr.l2_psm = cpu_to_le16(L2CAP_PSM_RFCOMM); 806 addr.l2_cid = 0; 807 addr.l2_bdaddr_type = BDADDR_BREDR; 808 *err = kernel_connect(sock, (struct sockaddr_unsized *)&addr, sizeof(addr), O_NONBLOCK); 809 if (*err == 0 || *err == -EINPROGRESS) 810 return s; 811 812 return rfcomm_session_del(s); 813 814 failed: 815 sock_release(sock); 816 return NULL; 817 } 818 819 void rfcomm_session_getaddr(struct rfcomm_session *s, bdaddr_t *src, bdaddr_t *dst) 820 { 821 struct l2cap_chan *chan = l2cap_pi(s->sock->sk)->chan; 822 if (src) 823 bacpy(src, &chan->src); 824 if (dst) 825 bacpy(dst, &chan->dst); 826 } 827 828 /* ---- RFCOMM frame sending ---- */ 829 static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len) 830 { 831 struct kvec iv = { data, len }; 832 struct msghdr msg; 833 834 BT_DBG("session %p len %d", s, len); 835 836 memset(&msg, 0, sizeof(msg)); 837 838 return kernel_sendmsg(s->sock, &msg, &iv, 1, len); 839 } 840 841 static int rfcomm_send_cmd(struct rfcomm_session *s, struct rfcomm_cmd *cmd) 842 { 843 BT_DBG("%p cmd %u", s, cmd->ctrl); 844 845 return rfcomm_send_frame(s, (void *) cmd, sizeof(*cmd)); 846 } 847 848 static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci) 849 { 850 struct rfcomm_cmd cmd; 851 852 BT_DBG("%p dlci %d", s, dlci); 853 854 cmd.addr = __addr(s->initiator, dlci); 855 cmd.ctrl = __ctrl(RFCOMM_SABM, 1); 856 cmd.len = __len8(0); 857 cmd.fcs = __fcs2((u8 *) &cmd); 858 859 return rfcomm_send_cmd(s, &cmd); 860 } 861 862 static int rfcomm_send_ua(struct rfcomm_session *s, u8 dlci) 863 { 864 struct rfcomm_cmd cmd; 865 866 BT_DBG("%p dlci %d", s, dlci); 867 868 cmd.addr = __addr(!s->initiator, dlci); 869 cmd.ctrl = __ctrl(RFCOMM_UA, 1); 870 cmd.len = __len8(0); 871 cmd.fcs = __fcs2((u8 *) &cmd); 872 873 return rfcomm_send_cmd(s, &cmd); 874 } 875 876 static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci) 877 { 878 struct rfcomm_cmd cmd; 879 880 BT_DBG("%p dlci %d", s, dlci); 881 882 cmd.addr = __addr(s->initiator, dlci); 883 cmd.ctrl = __ctrl(RFCOMM_DISC, 1); 884 cmd.len = __len8(0); 885 cmd.fcs = __fcs2((u8 *) &cmd); 886 887 return rfcomm_send_cmd(s, &cmd); 888 } 889 890 static int rfcomm_queue_disc(struct rfcomm_dlc *d) 891 { 892 struct rfcomm_cmd *cmd; 893 struct sk_buff *skb; 894 895 BT_DBG("dlc %p dlci %d", d, d->dlci); 896 897 skb = alloc_skb(sizeof(*cmd), GFP_KERNEL); 898 if (!skb) 899 return -ENOMEM; 900 901 cmd = __skb_put(skb, sizeof(*cmd)); 902 cmd->addr = d->addr; 903 cmd->ctrl = __ctrl(RFCOMM_DISC, 1); 904 cmd->len = __len8(0); 905 cmd->fcs = __fcs2((u8 *) cmd); 906 907 skb_queue_tail(&d->tx_queue, skb); 908 rfcomm_schedule(); 909 return 0; 910 } 911 912 static int rfcomm_send_dm(struct rfcomm_session *s, u8 dlci) 913 { 914 struct rfcomm_cmd cmd; 915 916 BT_DBG("%p dlci %d", s, dlci); 917 918 cmd.addr = __addr(!s->initiator, dlci); 919 cmd.ctrl = __ctrl(RFCOMM_DM, 1); 920 cmd.len = __len8(0); 921 cmd.fcs = __fcs2((u8 *) &cmd); 922 923 return rfcomm_send_cmd(s, &cmd); 924 } 925 926 static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type) 927 { 928 struct rfcomm_hdr *hdr; 929 struct rfcomm_mcc *mcc; 930 u8 buf[16], *ptr = buf; 931 932 BT_DBG("%p cr %d type %d", s, cr, type); 933 934 hdr = (void *) ptr; ptr += sizeof(*hdr); 935 hdr->addr = __addr(s->initiator, 0); 936 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 937 hdr->len = __len8(sizeof(*mcc) + 1); 938 939 mcc = (void *) ptr; ptr += sizeof(*mcc); 940 mcc->type = __mcc_type(0, RFCOMM_NSC); 941 mcc->len = __len8(1); 942 943 /* Type that we didn't like */ 944 *ptr = __mcc_type(cr, type); ptr++; 945 946 *ptr = __fcs(buf); ptr++; 947 948 return rfcomm_send_frame(s, buf, ptr - buf); 949 } 950 951 static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d) 952 { 953 struct rfcomm_hdr *hdr; 954 struct rfcomm_mcc *mcc; 955 struct rfcomm_pn *pn; 956 u8 buf[16], *ptr = buf; 957 958 BT_DBG("%p cr %d dlci %d mtu %d", s, cr, d->dlci, d->mtu); 959 960 hdr = (void *) ptr; ptr += sizeof(*hdr); 961 hdr->addr = __addr(s->initiator, 0); 962 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 963 hdr->len = __len8(sizeof(*mcc) + sizeof(*pn)); 964 965 mcc = (void *) ptr; ptr += sizeof(*mcc); 966 mcc->type = __mcc_type(cr, RFCOMM_PN); 967 mcc->len = __len8(sizeof(*pn)); 968 969 pn = (void *) ptr; ptr += sizeof(*pn); 970 pn->dlci = d->dlci; 971 pn->priority = d->priority; 972 pn->ack_timer = 0; 973 pn->max_retrans = 0; 974 975 if (s->cfc) { 976 pn->flow_ctrl = cr ? 0xf0 : 0xe0; 977 pn->credits = RFCOMM_DEFAULT_CREDITS; 978 } else { 979 pn->flow_ctrl = 0; 980 pn->credits = 0; 981 } 982 983 if (cr && channel_mtu >= 0) 984 pn->mtu = cpu_to_le16(channel_mtu); 985 else 986 pn->mtu = cpu_to_le16(d->mtu); 987 988 *ptr = __fcs(buf); ptr++; 989 990 return rfcomm_send_frame(s, buf, ptr - buf); 991 } 992 993 int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci, 994 u8 bit_rate, u8 data_bits, u8 stop_bits, 995 u8 parity, u8 flow_ctrl_settings, 996 u8 xon_char, u8 xoff_char, u16 param_mask) 997 { 998 struct rfcomm_hdr *hdr; 999 struct rfcomm_mcc *mcc; 1000 struct rfcomm_rpn *rpn; 1001 u8 buf[16], *ptr = buf; 1002 1003 BT_DBG("%p cr %d dlci %d bit_r 0x%x data_b 0x%x stop_b 0x%x parity 0x%x" 1004 " flwc_s 0x%x xon_c 0x%x xoff_c 0x%x p_mask 0x%x", 1005 s, cr, dlci, bit_rate, data_bits, stop_bits, parity, 1006 flow_ctrl_settings, xon_char, xoff_char, param_mask); 1007 1008 hdr = (void *) ptr; ptr += sizeof(*hdr); 1009 hdr->addr = __addr(s->initiator, 0); 1010 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 1011 hdr->len = __len8(sizeof(*mcc) + sizeof(*rpn)); 1012 1013 mcc = (void *) ptr; ptr += sizeof(*mcc); 1014 mcc->type = __mcc_type(cr, RFCOMM_RPN); 1015 mcc->len = __len8(sizeof(*rpn)); 1016 1017 rpn = (void *) ptr; ptr += sizeof(*rpn); 1018 rpn->dlci = __addr(1, dlci); 1019 rpn->bit_rate = bit_rate; 1020 rpn->line_settings = __rpn_line_settings(data_bits, stop_bits, parity); 1021 rpn->flow_ctrl = flow_ctrl_settings; 1022 rpn->xon_char = xon_char; 1023 rpn->xoff_char = xoff_char; 1024 rpn->param_mask = cpu_to_le16(param_mask); 1025 1026 *ptr = __fcs(buf); ptr++; 1027 1028 return rfcomm_send_frame(s, buf, ptr - buf); 1029 } 1030 1031 int rfcomm_dlc_send_rpn(struct rfcomm_dlc *d, u8 bit_rate, u8 data_bits, 1032 u8 stop_bits, u8 parity, u8 flow_ctrl_settings, 1033 u8 xon_char, u8 xoff_char, u16 param_mask) 1034 { 1035 int err = -ENOTCONN; 1036 1037 rfcomm_lock(); 1038 if (d->session) 1039 err = rfcomm_send_rpn(d->session, 1, d->dlci, bit_rate, 1040 data_bits, stop_bits, parity, 1041 flow_ctrl_settings, xon_char, xoff_char, 1042 param_mask); 1043 rfcomm_unlock(); 1044 1045 return err; 1046 } 1047 1048 static int rfcomm_send_rls(struct rfcomm_session *s, int cr, u8 dlci, u8 status) 1049 { 1050 struct rfcomm_hdr *hdr; 1051 struct rfcomm_mcc *mcc; 1052 struct rfcomm_rls *rls; 1053 u8 buf[16], *ptr = buf; 1054 1055 BT_DBG("%p cr %d status 0x%x", s, cr, status); 1056 1057 hdr = (void *) ptr; ptr += sizeof(*hdr); 1058 hdr->addr = __addr(s->initiator, 0); 1059 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 1060 hdr->len = __len8(sizeof(*mcc) + sizeof(*rls)); 1061 1062 mcc = (void *) ptr; ptr += sizeof(*mcc); 1063 mcc->type = __mcc_type(cr, RFCOMM_RLS); 1064 mcc->len = __len8(sizeof(*rls)); 1065 1066 rls = (void *) ptr; ptr += sizeof(*rls); 1067 rls->dlci = __addr(1, dlci); 1068 rls->status = status; 1069 1070 *ptr = __fcs(buf); ptr++; 1071 1072 return rfcomm_send_frame(s, buf, ptr - buf); 1073 } 1074 1075 static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig) 1076 { 1077 struct rfcomm_hdr *hdr; 1078 struct rfcomm_mcc *mcc; 1079 struct rfcomm_msc *msc; 1080 u8 buf[16], *ptr = buf; 1081 1082 BT_DBG("%p cr %d v24 0x%x", s, cr, v24_sig); 1083 1084 hdr = (void *) ptr; ptr += sizeof(*hdr); 1085 hdr->addr = __addr(s->initiator, 0); 1086 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 1087 hdr->len = __len8(sizeof(*mcc) + sizeof(*msc)); 1088 1089 mcc = (void *) ptr; ptr += sizeof(*mcc); 1090 mcc->type = __mcc_type(cr, RFCOMM_MSC); 1091 mcc->len = __len8(sizeof(*msc)); 1092 1093 msc = (void *) ptr; ptr += sizeof(*msc); 1094 msc->dlci = __addr(1, dlci); 1095 msc->v24_sig = v24_sig | 0x01; 1096 1097 *ptr = __fcs(buf); ptr++; 1098 1099 return rfcomm_send_frame(s, buf, ptr - buf); 1100 } 1101 1102 static int rfcomm_send_fcoff(struct rfcomm_session *s, int cr) 1103 { 1104 struct rfcomm_hdr *hdr; 1105 struct rfcomm_mcc *mcc; 1106 u8 buf[16], *ptr = buf; 1107 1108 BT_DBG("%p cr %d", s, cr); 1109 1110 hdr = (void *) ptr; ptr += sizeof(*hdr); 1111 hdr->addr = __addr(s->initiator, 0); 1112 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 1113 hdr->len = __len8(sizeof(*mcc)); 1114 1115 mcc = (void *) ptr; ptr += sizeof(*mcc); 1116 mcc->type = __mcc_type(cr, RFCOMM_FCOFF); 1117 mcc->len = __len8(0); 1118 1119 *ptr = __fcs(buf); ptr++; 1120 1121 return rfcomm_send_frame(s, buf, ptr - buf); 1122 } 1123 1124 static int rfcomm_send_fcon(struct rfcomm_session *s, int cr) 1125 { 1126 struct rfcomm_hdr *hdr; 1127 struct rfcomm_mcc *mcc; 1128 u8 buf[16], *ptr = buf; 1129 1130 BT_DBG("%p cr %d", s, cr); 1131 1132 hdr = (void *) ptr; ptr += sizeof(*hdr); 1133 hdr->addr = __addr(s->initiator, 0); 1134 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 1135 hdr->len = __len8(sizeof(*mcc)); 1136 1137 mcc = (void *) ptr; ptr += sizeof(*mcc); 1138 mcc->type = __mcc_type(cr, RFCOMM_FCON); 1139 mcc->len = __len8(0); 1140 1141 *ptr = __fcs(buf); ptr++; 1142 1143 return rfcomm_send_frame(s, buf, ptr - buf); 1144 } 1145 1146 static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len) 1147 { 1148 struct socket *sock = s->sock; 1149 struct kvec iv[3]; 1150 struct msghdr msg; 1151 unsigned char hdr[5], crc[1]; 1152 1153 if (len > 125) 1154 return -EINVAL; 1155 1156 BT_DBG("%p cr %d", s, cr); 1157 1158 hdr[0] = __addr(s->initiator, 0); 1159 hdr[1] = __ctrl(RFCOMM_UIH, 0); 1160 hdr[2] = 0x01 | ((len + 2) << 1); 1161 hdr[3] = 0x01 | ((cr & 0x01) << 1) | (RFCOMM_TEST << 2); 1162 hdr[4] = 0x01 | (len << 1); 1163 1164 crc[0] = __fcs(hdr); 1165 1166 iv[0].iov_base = hdr; 1167 iv[0].iov_len = 5; 1168 iv[1].iov_base = pattern; 1169 iv[1].iov_len = len; 1170 iv[2].iov_base = crc; 1171 iv[2].iov_len = 1; 1172 1173 memset(&msg, 0, sizeof(msg)); 1174 1175 return kernel_sendmsg(sock, &msg, iv, 3, 6 + len); 1176 } 1177 1178 static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits) 1179 { 1180 struct rfcomm_hdr *hdr; 1181 u8 buf[16], *ptr = buf; 1182 1183 BT_DBG("%p addr %d credits %d", s, addr, credits); 1184 1185 hdr = (void *) ptr; ptr += sizeof(*hdr); 1186 hdr->addr = addr; 1187 hdr->ctrl = __ctrl(RFCOMM_UIH, 1); 1188 hdr->len = __len8(0); 1189 1190 *ptr = credits; ptr++; 1191 1192 *ptr = __fcs(buf); ptr++; 1193 1194 return rfcomm_send_frame(s, buf, ptr - buf); 1195 } 1196 1197 static void rfcomm_make_uih(struct sk_buff *skb, u8 addr) 1198 { 1199 struct rfcomm_hdr *hdr; 1200 int len = skb->len; 1201 u8 *crc; 1202 1203 if (len > 127) { 1204 hdr = skb_push(skb, 4); 1205 put_unaligned(cpu_to_le16(__len16(len)), (__le16 *) &hdr->len); 1206 } else { 1207 hdr = skb_push(skb, 3); 1208 hdr->len = __len8(len); 1209 } 1210 hdr->addr = addr; 1211 hdr->ctrl = __ctrl(RFCOMM_UIH, 0); 1212 1213 crc = skb_put(skb, 1); 1214 *crc = __fcs((void *) hdr); 1215 } 1216 1217 /* ---- RFCOMM frame reception ---- */ 1218 static struct rfcomm_session *rfcomm_recv_ua(struct rfcomm_session *s, u8 dlci) 1219 { 1220 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); 1221 1222 if (dlci) { 1223 /* Data channel */ 1224 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci); 1225 if (!d) { 1226 rfcomm_send_dm(s, dlci); 1227 return s; 1228 } 1229 1230 switch (d->state) { 1231 case BT_CONNECT: 1232 rfcomm_dlc_clear_timer(d); 1233 1234 rfcomm_dlc_lock(d); 1235 d->state = BT_CONNECTED; 1236 d->state_change(d, 0); 1237 rfcomm_dlc_unlock(d); 1238 1239 rfcomm_send_msc(s, 1, dlci, d->v24_sig); 1240 break; 1241 1242 case BT_DISCONN: 1243 d->state = BT_CLOSED; 1244 __rfcomm_dlc_close(d, 0); 1245 1246 if (list_empty(&s->dlcs)) { 1247 s->state = BT_DISCONN; 1248 rfcomm_send_disc(s, 0); 1249 rfcomm_session_clear_timer(s); 1250 } 1251 1252 break; 1253 } 1254 } else { 1255 /* Control channel */ 1256 switch (s->state) { 1257 case BT_CONNECT: 1258 s->state = BT_CONNECTED; 1259 rfcomm_process_connect(s); 1260 break; 1261 1262 case BT_DISCONN: 1263 s = rfcomm_session_close(s, ECONNRESET); 1264 break; 1265 } 1266 } 1267 return s; 1268 } 1269 1270 static struct rfcomm_session *rfcomm_recv_dm(struct rfcomm_session *s, u8 dlci) 1271 { 1272 int err = 0; 1273 1274 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); 1275 1276 if (dlci) { 1277 /* Data DLC */ 1278 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci); 1279 if (d) { 1280 if (d->state == BT_CONNECT || d->state == BT_CONFIG) 1281 err = ECONNREFUSED; 1282 else 1283 err = ECONNRESET; 1284 1285 d->state = BT_CLOSED; 1286 __rfcomm_dlc_close(d, err); 1287 } 1288 } else { 1289 if (s->state == BT_CONNECT) 1290 err = ECONNREFUSED; 1291 else 1292 err = ECONNRESET; 1293 1294 s = rfcomm_session_close(s, err); 1295 } 1296 return s; 1297 } 1298 1299 static struct rfcomm_session *rfcomm_recv_disc(struct rfcomm_session *s, 1300 u8 dlci) 1301 { 1302 int err = 0; 1303 1304 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); 1305 1306 if (dlci) { 1307 struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci); 1308 if (d) { 1309 rfcomm_send_ua(s, dlci); 1310 1311 if (d->state == BT_CONNECT || d->state == BT_CONFIG) 1312 err = ECONNREFUSED; 1313 else 1314 err = ECONNRESET; 1315 1316 d->state = BT_CLOSED; 1317 __rfcomm_dlc_close(d, err); 1318 } else 1319 rfcomm_send_dm(s, dlci); 1320 1321 } else { 1322 rfcomm_send_ua(s, 0); 1323 1324 if (s->state == BT_CONNECT) 1325 err = ECONNREFUSED; 1326 else 1327 err = ECONNRESET; 1328 1329 s = rfcomm_session_close(s, err); 1330 } 1331 return s; 1332 } 1333 1334 void rfcomm_dlc_accept(struct rfcomm_dlc *d) 1335 { 1336 struct sock *sk = d->session->sock->sk; 1337 struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn; 1338 1339 BT_DBG("dlc %p", d); 1340 1341 rfcomm_send_ua(d->session, d->dlci); 1342 1343 rfcomm_dlc_clear_timer(d); 1344 1345 rfcomm_dlc_lock(d); 1346 d->state = BT_CONNECTED; 1347 d->state_change(d, 0); 1348 rfcomm_dlc_unlock(d); 1349 1350 if (d->role_switch) 1351 hci_conn_switch_role(conn->hcon, 0x00); 1352 1353 rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig); 1354 } 1355 1356 static void rfcomm_check_accept(struct rfcomm_dlc *d) 1357 { 1358 if (rfcomm_check_security(d)) { 1359 if (d->defer_setup) { 1360 set_bit(RFCOMM_DEFER_SETUP, &d->flags); 1361 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); 1362 1363 rfcomm_dlc_lock(d); 1364 d->state = BT_CONNECT2; 1365 d->state_change(d, 0); 1366 rfcomm_dlc_unlock(d); 1367 } else 1368 rfcomm_dlc_accept(d); 1369 } else { 1370 set_bit(RFCOMM_AUTH_PENDING, &d->flags); 1371 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); 1372 } 1373 } 1374 1375 static int rfcomm_recv_sabm(struct rfcomm_session *s, u8 dlci) 1376 { 1377 struct rfcomm_dlc *d; 1378 u8 channel; 1379 1380 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); 1381 1382 if (!dlci) { 1383 rfcomm_send_ua(s, 0); 1384 1385 if (s->state == BT_OPEN) { 1386 s->state = BT_CONNECTED; 1387 rfcomm_process_connect(s); 1388 } 1389 return 0; 1390 } 1391 1392 /* Check if DLC exists */ 1393 d = rfcomm_dlc_get(s, dlci); 1394 if (d) { 1395 if (d->state == BT_OPEN) { 1396 /* DLC was previously opened by PN request */ 1397 rfcomm_check_accept(d); 1398 } 1399 return 0; 1400 } 1401 1402 /* Notify socket layer about incoming connection */ 1403 channel = __srv_channel(dlci); 1404 if (rfcomm_connect_ind(s, channel, &d)) { 1405 d->dlci = dlci; 1406 d->addr = __addr(s->initiator, dlci); 1407 rfcomm_dlc_link(s, d); 1408 1409 rfcomm_check_accept(d); 1410 } else { 1411 rfcomm_send_dm(s, dlci); 1412 } 1413 1414 return 0; 1415 } 1416 1417 static int rfcomm_apply_pn(struct rfcomm_dlc *d, int cr, struct rfcomm_pn *pn) 1418 { 1419 struct rfcomm_session *s = d->session; 1420 1421 BT_DBG("dlc %p state %ld dlci %d mtu %d fc 0x%x credits %d", 1422 d, d->state, d->dlci, pn->mtu, pn->flow_ctrl, pn->credits); 1423 1424 if ((pn->flow_ctrl == 0xf0 && s->cfc != RFCOMM_CFC_DISABLED) || 1425 pn->flow_ctrl == 0xe0) { 1426 d->cfc = RFCOMM_CFC_ENABLED; 1427 d->tx_credits = pn->credits; 1428 } else { 1429 d->cfc = RFCOMM_CFC_DISABLED; 1430 set_bit(RFCOMM_TX_THROTTLED, &d->flags); 1431 } 1432 1433 if (s->cfc == RFCOMM_CFC_UNKNOWN) 1434 s->cfc = d->cfc; 1435 1436 d->priority = pn->priority; 1437 1438 d->mtu = __le16_to_cpu(pn->mtu); 1439 1440 if (cr && d->mtu > s->mtu) 1441 d->mtu = s->mtu; 1442 1443 return 0; 1444 } 1445 1446 static int rfcomm_recv_pn(struct rfcomm_session *s, int cr, struct sk_buff *skb) 1447 { 1448 struct rfcomm_pn *pn; 1449 struct rfcomm_dlc *d; 1450 u8 dlci; 1451 1452 pn = skb_pull_data(skb, sizeof(*pn)); 1453 if (!pn) 1454 return -EILSEQ; 1455 1456 dlci = pn->dlci; 1457 BT_DBG("session %p state %ld dlci %d", s, s->state, dlci); 1458 1459 if (!dlci) 1460 return 0; 1461 1462 d = rfcomm_dlc_get(s, dlci); 1463 if (d) { 1464 if (cr) { 1465 /* PN request */ 1466 rfcomm_apply_pn(d, cr, pn); 1467 rfcomm_send_pn(s, 0, d); 1468 } else { 1469 /* PN response */ 1470 switch (d->state) { 1471 case BT_CONFIG: 1472 rfcomm_apply_pn(d, cr, pn); 1473 1474 d->state = BT_CONNECT; 1475 rfcomm_send_sabm(s, d->dlci); 1476 break; 1477 } 1478 } 1479 } else { 1480 u8 channel = __srv_channel(dlci); 1481 1482 if (!cr) 1483 return 0; 1484 1485 /* PN request for non existing DLC. 1486 * Assume incoming connection. */ 1487 if (rfcomm_connect_ind(s, channel, &d)) { 1488 d->dlci = dlci; 1489 d->addr = __addr(s->initiator, dlci); 1490 rfcomm_dlc_link(s, d); 1491 1492 rfcomm_apply_pn(d, cr, pn); 1493 1494 d->state = BT_OPEN; 1495 rfcomm_send_pn(s, 0, d); 1496 } else { 1497 rfcomm_send_dm(s, dlci); 1498 } 1499 } 1500 return 0; 1501 } 1502 1503 static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_buff *skb) 1504 { 1505 struct rfcomm_rpn *rpn; 1506 u8 dlci; 1507 1508 u8 bit_rate = 0; 1509 u8 data_bits = 0; 1510 u8 stop_bits = 0; 1511 u8 parity = 0; 1512 u8 flow_ctrl = 0; 1513 u8 xon_char = 0; 1514 u8 xoff_char = 0; 1515 u16 rpn_mask = RFCOMM_RPN_PM_ALL; 1516 1517 if (len == 1) { 1518 rpn = skb_pull_data(skb, 1); 1519 if (!rpn) 1520 return -EILSEQ; 1521 1522 dlci = __get_dlci(rpn->dlci); 1523 1524 if (!cr) 1525 return 0; 1526 1527 bit_rate = RFCOMM_RPN_BR_9600; 1528 data_bits = RFCOMM_RPN_DATA_8; 1529 stop_bits = RFCOMM_RPN_STOP_1; 1530 parity = RFCOMM_RPN_PARITY_NONE; 1531 flow_ctrl = RFCOMM_RPN_FLOW_NONE; 1532 xon_char = RFCOMM_RPN_XON_CHAR; 1533 xoff_char = RFCOMM_RPN_XOFF_CHAR; 1534 goto rpn_out; 1535 } 1536 1537 rpn = skb_pull_data(skb, sizeof(*rpn)); 1538 if (!rpn) 1539 return -EILSEQ; 1540 1541 dlci = __get_dlci(rpn->dlci); 1542 1543 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", 1544 dlci, cr, len, rpn->bit_rate, rpn->line_settings, rpn->flow_ctrl, 1545 rpn->xon_char, rpn->xoff_char, rpn->param_mask); 1546 1547 if (!cr) 1548 return 0; 1549 1550 /* Check for sane values, ignore/accept bit_rate, 8 bits, 1 stop bit, 1551 * no parity, no flow control lines, normal XON/XOFF chars */ 1552 1553 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_BITRATE)) { 1554 bit_rate = rpn->bit_rate; 1555 if (bit_rate > RFCOMM_RPN_BR_230400) { 1556 BT_DBG("RPN bit rate mismatch 0x%x", bit_rate); 1557 bit_rate = RFCOMM_RPN_BR_9600; 1558 rpn_mask ^= RFCOMM_RPN_PM_BITRATE; 1559 } 1560 } 1561 1562 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_DATA)) { 1563 data_bits = __get_rpn_data_bits(rpn->line_settings); 1564 if (data_bits != RFCOMM_RPN_DATA_8) { 1565 BT_DBG("RPN data bits mismatch 0x%x", data_bits); 1566 data_bits = RFCOMM_RPN_DATA_8; 1567 rpn_mask ^= RFCOMM_RPN_PM_DATA; 1568 } 1569 } 1570 1571 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_STOP)) { 1572 stop_bits = __get_rpn_stop_bits(rpn->line_settings); 1573 if (stop_bits != RFCOMM_RPN_STOP_1) { 1574 BT_DBG("RPN stop bits mismatch 0x%x", stop_bits); 1575 stop_bits = RFCOMM_RPN_STOP_1; 1576 rpn_mask ^= RFCOMM_RPN_PM_STOP; 1577 } 1578 } 1579 1580 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_PARITY)) { 1581 parity = __get_rpn_parity(rpn->line_settings); 1582 if (parity != RFCOMM_RPN_PARITY_NONE) { 1583 BT_DBG("RPN parity mismatch 0x%x", parity); 1584 parity = RFCOMM_RPN_PARITY_NONE; 1585 rpn_mask ^= RFCOMM_RPN_PM_PARITY; 1586 } 1587 } 1588 1589 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_FLOW)) { 1590 flow_ctrl = rpn->flow_ctrl; 1591 if (flow_ctrl != RFCOMM_RPN_FLOW_NONE) { 1592 BT_DBG("RPN flow ctrl mismatch 0x%x", flow_ctrl); 1593 flow_ctrl = RFCOMM_RPN_FLOW_NONE; 1594 rpn_mask ^= RFCOMM_RPN_PM_FLOW; 1595 } 1596 } 1597 1598 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XON)) { 1599 xon_char = rpn->xon_char; 1600 if (xon_char != RFCOMM_RPN_XON_CHAR) { 1601 BT_DBG("RPN XON char mismatch 0x%x", xon_char); 1602 xon_char = RFCOMM_RPN_XON_CHAR; 1603 rpn_mask ^= RFCOMM_RPN_PM_XON; 1604 } 1605 } 1606 1607 if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XOFF)) { 1608 xoff_char = rpn->xoff_char; 1609 if (xoff_char != RFCOMM_RPN_XOFF_CHAR) { 1610 BT_DBG("RPN XOFF char mismatch 0x%x", xoff_char); 1611 xoff_char = RFCOMM_RPN_XOFF_CHAR; 1612 rpn_mask ^= RFCOMM_RPN_PM_XOFF; 1613 } 1614 } 1615 1616 rpn_out: 1617 rfcomm_send_rpn(s, 0, dlci, bit_rate, data_bits, stop_bits, 1618 parity, flow_ctrl, xon_char, xoff_char, rpn_mask); 1619 1620 return 0; 1621 } 1622 1623 static int rfcomm_recv_rls(struct rfcomm_session *s, int cr, struct sk_buff *skb) 1624 { 1625 struct rfcomm_rls *rls; 1626 u8 dlci; 1627 1628 rls = skb_pull_data(skb, sizeof(*rls)); 1629 if (!rls) 1630 return -EILSEQ; 1631 1632 dlci = __get_dlci(rls->dlci); 1633 BT_DBG("dlci %d cr %d status 0x%x", dlci, cr, rls->status); 1634 1635 if (!cr) 1636 return 0; 1637 1638 /* We should probably do something with this information here. But 1639 * for now it's sufficient just to reply -- Bluetooth 1.1 says it's 1640 * mandatory to recognise and respond to RLS */ 1641 1642 rfcomm_send_rls(s, 0, dlci, rls->status); 1643 1644 return 0; 1645 } 1646 1647 static int rfcomm_recv_msc(struct rfcomm_session *s, int cr, struct sk_buff *skb) 1648 { 1649 struct rfcomm_msc *msc; 1650 struct rfcomm_dlc *d; 1651 u8 dlci; 1652 1653 msc = skb_pull_data(skb, sizeof(*msc)); 1654 if (!msc) 1655 return -EILSEQ; 1656 1657 dlci = __get_dlci(msc->dlci); 1658 BT_DBG("dlci %d cr %d v24 0x%x", dlci, cr, msc->v24_sig); 1659 1660 d = rfcomm_dlc_get(s, dlci); 1661 if (!d) 1662 return 0; 1663 1664 if (cr) { 1665 if (msc->v24_sig & RFCOMM_V24_FC && !d->cfc) 1666 set_bit(RFCOMM_TX_THROTTLED, &d->flags); 1667 else 1668 clear_bit(RFCOMM_TX_THROTTLED, &d->flags); 1669 1670 rfcomm_dlc_lock(d); 1671 1672 d->remote_v24_sig = msc->v24_sig; 1673 1674 if (d->modem_status) 1675 d->modem_status(d, msc->v24_sig); 1676 1677 rfcomm_dlc_unlock(d); 1678 1679 rfcomm_send_msc(s, 0, dlci, msc->v24_sig); 1680 1681 d->mscex |= RFCOMM_MSCEX_RX; 1682 } else 1683 d->mscex |= RFCOMM_MSCEX_TX; 1684 1685 return 0; 1686 } 1687 1688 static int rfcomm_recv_mcc(struct rfcomm_session *s, struct sk_buff *skb) 1689 { 1690 struct rfcomm_mcc *mcc; 1691 u8 type, cr, len; 1692 1693 mcc = skb_pull_data(skb, sizeof(*mcc)); 1694 if (!mcc) 1695 return -EILSEQ; 1696 1697 cr = __test_cr(mcc->type); 1698 type = __get_mcc_type(mcc->type); 1699 len = __get_mcc_len(mcc->len); 1700 1701 BT_DBG("%p type 0x%x cr %d", s, type, cr); 1702 1703 switch (type) { 1704 case RFCOMM_PN: 1705 rfcomm_recv_pn(s, cr, skb); 1706 break; 1707 1708 case RFCOMM_RPN: 1709 rfcomm_recv_rpn(s, cr, len, skb); 1710 break; 1711 1712 case RFCOMM_RLS: 1713 rfcomm_recv_rls(s, cr, skb); 1714 break; 1715 1716 case RFCOMM_MSC: 1717 rfcomm_recv_msc(s, cr, skb); 1718 break; 1719 1720 case RFCOMM_FCOFF: 1721 if (cr) { 1722 set_bit(RFCOMM_TX_THROTTLED, &s->flags); 1723 rfcomm_send_fcoff(s, 0); 1724 } 1725 break; 1726 1727 case RFCOMM_FCON: 1728 if (cr) { 1729 clear_bit(RFCOMM_TX_THROTTLED, &s->flags); 1730 rfcomm_send_fcon(s, 0); 1731 } 1732 break; 1733 1734 case RFCOMM_TEST: 1735 if (cr) 1736 rfcomm_send_test(s, 0, skb->data, skb->len); 1737 break; 1738 1739 case RFCOMM_NSC: 1740 break; 1741 1742 default: 1743 BT_ERR("Unknown control type 0x%02x", type); 1744 rfcomm_send_nsc(s, cr, type); 1745 break; 1746 } 1747 return 0; 1748 } 1749 1750 static int rfcomm_recv_data(struct rfcomm_session *s, u8 dlci, int pf, struct sk_buff *skb) 1751 { 1752 struct rfcomm_dlc *d; 1753 1754 BT_DBG("session %p state %ld dlci %d pf %d", s, s->state, dlci, pf); 1755 1756 d = rfcomm_dlc_get(s, dlci); 1757 if (!d) { 1758 rfcomm_send_dm(s, dlci); 1759 goto drop; 1760 } 1761 1762 if (pf && d->cfc) { 1763 u8 *credits = skb_pull_data(skb, 1); 1764 1765 if (!credits) 1766 goto drop; 1767 1768 d->tx_credits += *credits; 1769 if (d->tx_credits) 1770 clear_bit(RFCOMM_TX_THROTTLED, &d->flags); 1771 } 1772 1773 if (skb->len && d->state == BT_CONNECTED) { 1774 rfcomm_dlc_lock(d); 1775 d->rx_credits--; 1776 d->data_ready(d, skb); 1777 rfcomm_dlc_unlock(d); 1778 return 0; 1779 } 1780 1781 drop: 1782 kfree_skb(skb); 1783 return 0; 1784 } 1785 1786 static struct rfcomm_session *rfcomm_recv_frame(struct rfcomm_session *s, 1787 struct sk_buff *skb) 1788 { 1789 struct rfcomm_hdr *hdr = (void *) skb->data; 1790 u8 type, dlci, fcs; 1791 1792 if (!s) { 1793 /* no session, so free socket data */ 1794 kfree_skb(skb); 1795 return s; 1796 } 1797 1798 dlci = __get_dlci(hdr->addr); 1799 type = __get_type(hdr->ctrl); 1800 1801 /* Trim FCS */ 1802 skb->len--; skb->tail--; 1803 fcs = *(u8 *)skb_tail_pointer(skb); 1804 1805 if (__check_fcs(skb->data, type, fcs)) { 1806 BT_ERR("bad checksum in packet"); 1807 kfree_skb(skb); 1808 return s; 1809 } 1810 1811 if (__test_ea(hdr->len)) 1812 skb_pull(skb, 3); 1813 else 1814 skb_pull(skb, 4); 1815 1816 switch (type) { 1817 case RFCOMM_SABM: 1818 if (__test_pf(hdr->ctrl)) 1819 rfcomm_recv_sabm(s, dlci); 1820 break; 1821 1822 case RFCOMM_DISC: 1823 if (__test_pf(hdr->ctrl)) 1824 s = rfcomm_recv_disc(s, dlci); 1825 break; 1826 1827 case RFCOMM_UA: 1828 if (__test_pf(hdr->ctrl)) 1829 s = rfcomm_recv_ua(s, dlci); 1830 break; 1831 1832 case RFCOMM_DM: 1833 s = rfcomm_recv_dm(s, dlci); 1834 break; 1835 1836 case RFCOMM_UIH: 1837 if (dlci) { 1838 rfcomm_recv_data(s, dlci, __test_pf(hdr->ctrl), skb); 1839 return s; 1840 } 1841 rfcomm_recv_mcc(s, skb); 1842 break; 1843 1844 default: 1845 BT_ERR("Unknown packet type 0x%02x", type); 1846 break; 1847 } 1848 kfree_skb(skb); 1849 return s; 1850 } 1851 1852 /* ---- Connection and data processing ---- */ 1853 1854 static void rfcomm_process_connect(struct rfcomm_session *s) 1855 { 1856 struct rfcomm_dlc *d, *n; 1857 1858 BT_DBG("session %p state %ld", s, s->state); 1859 1860 list_for_each_entry_safe(d, n, &s->dlcs, list) { 1861 if (d->state == BT_CONFIG) { 1862 d->mtu = s->mtu; 1863 if (rfcomm_check_security(d)) { 1864 rfcomm_send_pn(s, 1, d); 1865 } else { 1866 set_bit(RFCOMM_AUTH_PENDING, &d->flags); 1867 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); 1868 } 1869 } 1870 } 1871 } 1872 1873 /* Send data queued for the DLC. 1874 * Return number of frames left in the queue. 1875 */ 1876 static int rfcomm_process_tx(struct rfcomm_dlc *d) 1877 { 1878 struct sk_buff *skb; 1879 int err; 1880 1881 BT_DBG("dlc %p state %ld cfc %d rx_credits %d tx_credits %d", 1882 d, d->state, d->cfc, d->rx_credits, d->tx_credits); 1883 1884 /* Send pending MSC */ 1885 if (test_and_clear_bit(RFCOMM_MSC_PENDING, &d->flags)) 1886 rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig); 1887 1888 if (d->cfc) { 1889 /* CFC enabled. 1890 * Give them some credits */ 1891 if (!test_bit(RFCOMM_RX_THROTTLED, &d->flags) && 1892 d->rx_credits <= (d->cfc >> 2)) { 1893 rfcomm_send_credits(d->session, d->addr, d->cfc - d->rx_credits); 1894 d->rx_credits = d->cfc; 1895 } 1896 } else { 1897 /* CFC disabled. 1898 * Give ourselves some credits */ 1899 d->tx_credits = 5; 1900 } 1901 1902 if (test_bit(RFCOMM_TX_THROTTLED, &d->flags)) 1903 return skb_queue_len(&d->tx_queue); 1904 1905 while (d->tx_credits && (skb = skb_dequeue(&d->tx_queue))) { 1906 err = rfcomm_send_frame(d->session, skb->data, skb->len); 1907 if (err < 0) { 1908 skb_queue_head(&d->tx_queue, skb); 1909 break; 1910 } 1911 kfree_skb(skb); 1912 d->tx_credits--; 1913 } 1914 1915 if (d->cfc && !d->tx_credits) { 1916 /* We're out of TX credits. 1917 * Set TX_THROTTLED flag to avoid unnesary wakeups by dlc_send. */ 1918 set_bit(RFCOMM_TX_THROTTLED, &d->flags); 1919 } 1920 1921 return skb_queue_len(&d->tx_queue); 1922 } 1923 1924 static void rfcomm_process_dlcs(struct rfcomm_session *s) 1925 { 1926 struct rfcomm_dlc *d, *n; 1927 1928 BT_DBG("session %p state %ld", s, s->state); 1929 1930 list_for_each_entry_safe(d, n, &s->dlcs, list) { 1931 if (test_bit(RFCOMM_TIMED_OUT, &d->flags)) { 1932 __rfcomm_dlc_close(d, ETIMEDOUT); 1933 continue; 1934 } 1935 1936 if (test_bit(RFCOMM_ENC_DROP, &d->flags)) { 1937 __rfcomm_dlc_close(d, ECONNREFUSED); 1938 continue; 1939 } 1940 1941 if (test_and_clear_bit(RFCOMM_AUTH_ACCEPT, &d->flags)) { 1942 rfcomm_dlc_clear_timer(d); 1943 if (d->out) { 1944 rfcomm_send_pn(s, 1, d); 1945 rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT); 1946 } else { 1947 if (d->defer_setup) { 1948 set_bit(RFCOMM_DEFER_SETUP, &d->flags); 1949 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); 1950 1951 rfcomm_dlc_lock(d); 1952 d->state = BT_CONNECT2; 1953 d->state_change(d, 0); 1954 rfcomm_dlc_unlock(d); 1955 } else 1956 rfcomm_dlc_accept(d); 1957 } 1958 continue; 1959 } else if (test_and_clear_bit(RFCOMM_AUTH_REJECT, &d->flags)) { 1960 rfcomm_dlc_clear_timer(d); 1961 if (!d->out) 1962 rfcomm_send_dm(s, d->dlci); 1963 else 1964 d->state = BT_CLOSED; 1965 __rfcomm_dlc_close(d, ECONNREFUSED); 1966 continue; 1967 } 1968 1969 if (test_bit(RFCOMM_SEC_PENDING, &d->flags)) 1970 continue; 1971 1972 if (test_bit(RFCOMM_TX_THROTTLED, &s->flags)) 1973 continue; 1974 1975 if ((d->state == BT_CONNECTED || d->state == BT_DISCONN) && 1976 d->mscex == RFCOMM_MSCEX_OK) 1977 rfcomm_process_tx(d); 1978 } 1979 } 1980 1981 static struct rfcomm_session *rfcomm_process_rx(struct rfcomm_session *s) 1982 { 1983 struct socket *sock = s->sock; 1984 struct sock *sk = sock->sk; 1985 struct sk_buff *skb; 1986 1987 BT_DBG("session %p state %ld qlen %d", s, s->state, skb_queue_len(&sk->sk_receive_queue)); 1988 1989 /* Get data directly from socket receive queue without copying it. */ 1990 while ((skb = skb_dequeue(&sk->sk_receive_queue))) { 1991 skb_orphan(skb); 1992 if (!skb_linearize(skb) && sk->sk_state != BT_CLOSED) { 1993 s = rfcomm_recv_frame(s, skb); 1994 if (!s) 1995 break; 1996 } else { 1997 kfree_skb(skb); 1998 } 1999 } 2000 2001 if (s && (sk->sk_state == BT_CLOSED)) 2002 s = rfcomm_session_close(s, sk->sk_err); 2003 2004 return s; 2005 } 2006 2007 static void rfcomm_accept_connection(struct rfcomm_session *s) 2008 { 2009 struct socket *sock = s->sock, *nsock; 2010 int err; 2011 2012 /* Fast check for a new connection. 2013 * Avoids unnecessary socket allocations. 2014 */ 2015 if (list_empty(&bt_sk(sock->sk)->accept_q)) 2016 return; 2017 2018 BT_DBG("session %p", s); 2019 2020 err = kernel_accept(sock, &nsock, O_NONBLOCK); 2021 if (err < 0) 2022 return; 2023 2024 /* Set our callbacks */ 2025 nsock->sk->sk_data_ready = rfcomm_l2data_ready; 2026 nsock->sk->sk_state_change = rfcomm_l2state_change; 2027 2028 s = rfcomm_session_add(nsock, BT_OPEN); 2029 if (s) { 2030 /* We should adjust MTU on incoming sessions. 2031 * L2CAP MTU minus UIH header and FCS. */ 2032 s->mtu = min(l2cap_pi(nsock->sk)->chan->omtu, 2033 l2cap_pi(nsock->sk)->chan->imtu) - 5; 2034 2035 rfcomm_schedule(); 2036 } else 2037 sock_release(nsock); 2038 } 2039 2040 static struct rfcomm_session *rfcomm_check_connection(struct rfcomm_session *s) 2041 { 2042 struct sock *sk = s->sock->sk; 2043 2044 BT_DBG("%p state %ld", s, s->state); 2045 2046 switch (sk->sk_state) { 2047 case BT_CONNECTED: 2048 s->state = BT_CONNECT; 2049 2050 /* We can adjust MTU on outgoing sessions. 2051 * L2CAP MTU minus UIH header and FCS. */ 2052 s->mtu = min(l2cap_pi(sk)->chan->omtu, l2cap_pi(sk)->chan->imtu) - 5; 2053 2054 rfcomm_send_sabm(s, 0); 2055 break; 2056 2057 case BT_CLOSED: 2058 s = rfcomm_session_close(s, sk->sk_err); 2059 break; 2060 } 2061 return s; 2062 } 2063 2064 static void rfcomm_process_sessions(void) 2065 { 2066 struct rfcomm_session *s, *n; 2067 2068 rfcomm_lock(); 2069 2070 list_for_each_entry_safe(s, n, &session_list, list) { 2071 if (test_and_clear_bit(RFCOMM_TIMED_OUT, &s->flags)) { 2072 s->state = BT_DISCONN; 2073 rfcomm_send_disc(s, 0); 2074 continue; 2075 } 2076 2077 switch (s->state) { 2078 case BT_LISTEN: 2079 rfcomm_accept_connection(s); 2080 continue; 2081 2082 case BT_BOUND: 2083 s = rfcomm_check_connection(s); 2084 break; 2085 2086 default: 2087 s = rfcomm_process_rx(s); 2088 break; 2089 } 2090 2091 if (s) 2092 rfcomm_process_dlcs(s); 2093 } 2094 2095 rfcomm_unlock(); 2096 } 2097 2098 static int rfcomm_add_listener(bdaddr_t *ba) 2099 { 2100 struct sockaddr_l2 addr; 2101 struct socket *sock; 2102 struct sock *sk; 2103 struct rfcomm_session *s; 2104 int err = 0; 2105 2106 /* Create socket */ 2107 err = rfcomm_l2sock_create(&sock); 2108 if (err < 0) { 2109 BT_ERR("Create socket failed %d", err); 2110 return err; 2111 } 2112 2113 /* Bind socket */ 2114 bacpy(&addr.l2_bdaddr, ba); 2115 addr.l2_family = AF_BLUETOOTH; 2116 addr.l2_psm = cpu_to_le16(L2CAP_PSM_RFCOMM); 2117 addr.l2_cid = 0; 2118 addr.l2_bdaddr_type = BDADDR_BREDR; 2119 err = kernel_bind(sock, (struct sockaddr_unsized *)&addr, sizeof(addr)); 2120 if (err < 0) { 2121 BT_ERR("Bind failed %d", err); 2122 goto failed; 2123 } 2124 2125 /* Set L2CAP options */ 2126 sk = sock->sk; 2127 lock_sock(sk); 2128 /* Set MTU to 0 so L2CAP can auto select the MTU */ 2129 l2cap_pi(sk)->chan->imtu = 0; 2130 release_sock(sk); 2131 2132 /* Start listening on the socket */ 2133 err = kernel_listen(sock, 10); 2134 if (err) { 2135 BT_ERR("Listen failed %d", err); 2136 goto failed; 2137 } 2138 2139 /* Add listening session */ 2140 s = rfcomm_session_add(sock, BT_LISTEN); 2141 if (!s) { 2142 err = -ENOMEM; 2143 goto failed; 2144 } 2145 2146 return 0; 2147 failed: 2148 sock_release(sock); 2149 return err; 2150 } 2151 2152 static void rfcomm_kill_listener(void) 2153 { 2154 struct rfcomm_session *s, *n; 2155 2156 BT_DBG(""); 2157 2158 list_for_each_entry_safe(s, n, &session_list, list) 2159 rfcomm_session_del(s); 2160 } 2161 2162 static int rfcomm_run(void *unused) 2163 { 2164 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2165 BT_DBG(""); 2166 2167 set_user_nice(current, -10); 2168 2169 rfcomm_add_listener(BDADDR_ANY); 2170 2171 add_wait_queue(&rfcomm_wq, &wait); 2172 while (!kthread_should_stop()) { 2173 2174 /* Process stuff */ 2175 rfcomm_process_sessions(); 2176 2177 wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); 2178 } 2179 remove_wait_queue(&rfcomm_wq, &wait); 2180 2181 rfcomm_kill_listener(); 2182 2183 return 0; 2184 } 2185 2186 static void rfcomm_security_cfm(struct hci_conn *conn, u8 status, u8 encrypt) 2187 { 2188 struct rfcomm_session *s; 2189 struct rfcomm_dlc *d, *n; 2190 2191 BT_DBG("conn %p status 0x%02x encrypt 0x%02x", conn, status, encrypt); 2192 2193 s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst); 2194 if (!s) 2195 return; 2196 2197 list_for_each_entry_safe(d, n, &s->dlcs, list) { 2198 if (test_and_clear_bit(RFCOMM_SEC_PENDING, &d->flags)) { 2199 rfcomm_dlc_clear_timer(d); 2200 if (status || encrypt == 0x00) { 2201 set_bit(RFCOMM_ENC_DROP, &d->flags); 2202 continue; 2203 } 2204 } 2205 2206 if (d->state == BT_CONNECTED && !status && encrypt == 0x00) { 2207 if (d->sec_level == BT_SECURITY_MEDIUM) { 2208 set_bit(RFCOMM_SEC_PENDING, &d->flags); 2209 rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT); 2210 continue; 2211 } else if (d->sec_level == BT_SECURITY_HIGH || 2212 d->sec_level == BT_SECURITY_FIPS) { 2213 set_bit(RFCOMM_ENC_DROP, &d->flags); 2214 continue; 2215 } 2216 } 2217 2218 if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags)) 2219 continue; 2220 2221 if (!status && hci_conn_check_secure(conn, d->sec_level)) 2222 set_bit(RFCOMM_AUTH_ACCEPT, &d->flags); 2223 else 2224 set_bit(RFCOMM_AUTH_REJECT, &d->flags); 2225 } 2226 2227 rfcomm_schedule(); 2228 } 2229 2230 static struct hci_cb rfcomm_cb = { 2231 .name = "RFCOMM", 2232 .security_cfm = rfcomm_security_cfm 2233 }; 2234 2235 static int rfcomm_dlc_debugfs_show(struct seq_file *f, void *x) 2236 { 2237 struct rfcomm_session *s; 2238 2239 rfcomm_lock(); 2240 2241 list_for_each_entry(s, &session_list, list) { 2242 struct l2cap_chan *chan = l2cap_pi(s->sock->sk)->chan; 2243 struct rfcomm_dlc *d; 2244 list_for_each_entry(d, &s->dlcs, list) { 2245 seq_printf(f, "%pMR %pMR %ld %d %d %d %d\n", 2246 &chan->src, &chan->dst, 2247 d->state, d->dlci, d->mtu, 2248 d->rx_credits, d->tx_credits); 2249 } 2250 } 2251 2252 rfcomm_unlock(); 2253 2254 return 0; 2255 } 2256 2257 DEFINE_SHOW_ATTRIBUTE(rfcomm_dlc_debugfs); 2258 2259 static struct dentry *rfcomm_dlc_debugfs; 2260 2261 /* ---- Initialization ---- */ 2262 static int __init rfcomm_init(void) 2263 { 2264 int err; 2265 2266 hci_register_cb(&rfcomm_cb); 2267 2268 rfcomm_thread = kthread_run(rfcomm_run, NULL, "krfcommd"); 2269 if (IS_ERR(rfcomm_thread)) { 2270 err = PTR_ERR(rfcomm_thread); 2271 goto unregister; 2272 } 2273 2274 err = rfcomm_init_ttys(); 2275 if (err < 0) 2276 goto stop; 2277 2278 err = rfcomm_init_sockets(); 2279 if (err < 0) 2280 goto cleanup; 2281 2282 BT_INFO("RFCOMM ver %s", VERSION); 2283 2284 if (IS_ERR_OR_NULL(bt_debugfs)) 2285 return 0; 2286 2287 rfcomm_dlc_debugfs = debugfs_create_file("rfcomm_dlc", 0444, 2288 bt_debugfs, NULL, 2289 &rfcomm_dlc_debugfs_fops); 2290 2291 return 0; 2292 2293 cleanup: 2294 rfcomm_cleanup_ttys(); 2295 2296 stop: 2297 kthread_stop(rfcomm_thread); 2298 2299 unregister: 2300 hci_unregister_cb(&rfcomm_cb); 2301 2302 return err; 2303 } 2304 2305 static void __exit rfcomm_exit(void) 2306 { 2307 debugfs_remove(rfcomm_dlc_debugfs); 2308 2309 hci_unregister_cb(&rfcomm_cb); 2310 2311 kthread_stop(rfcomm_thread); 2312 2313 rfcomm_cleanup_ttys(); 2314 2315 rfcomm_cleanup_sockets(); 2316 } 2317 2318 module_init(rfcomm_init); 2319 module_exit(rfcomm_exit); 2320 2321 module_param(disable_cfc, bool, 0644); 2322 MODULE_PARM_DESC(disable_cfc, "Disable credit based flow control"); 2323 2324 module_param(channel_mtu, int, 0644); 2325 MODULE_PARM_DESC(channel_mtu, "Default MTU for the RFCOMM channel"); 2326 2327 module_param(l2cap_ertm, bool, 0644); 2328 MODULE_PARM_DESC(l2cap_ertm, "Use L2CAP ERTM mode for connection"); 2329 2330 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); 2331 MODULE_DESCRIPTION("Bluetooth RFCOMM ver " VERSION); 2332 MODULE_VERSION(VERSION); 2333 MODULE_LICENSE("GPL"); 2334 MODULE_ALIAS("bt-proto-3"); 2335