1 /* 2 BlueZ - Bluetooth protocol stack for Linux 3 Copyright (C) 2000-2001 Qualcomm Incorporated 4 Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> 5 Copyright (C) 2010 Google Inc. 6 Copyright (C) 2011 ProFUSION Embedded Systems 7 8 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> 9 10 This program is free software; you can redistribute it and/or modify 11 it under the terms of the GNU General Public License version 2 as 12 published by the Free Software Foundation; 13 14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 15 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. 17 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY 18 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 21 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 22 23 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 24 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 25 SOFTWARE IS DISCLAIMED. 26 */ 27 28 /* Bluetooth L2CAP sockets. */ 29 30 #include <linux/module.h> 31 #include <linux/export.h> 32 #include <linux/sched/signal.h> 33 34 #include <net/bluetooth/bluetooth.h> 35 #include <net/bluetooth/hci_core.h> 36 #include <net/bluetooth/l2cap.h> 37 38 #include "smp.h" 39 40 static struct bt_sock_list l2cap_sk_list = { 41 .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock) 42 }; 43 44 static const struct proto_ops l2cap_sock_ops; 45 static void l2cap_sock_init(struct sock *sk, struct sock *parent); 46 static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, 47 int proto, gfp_t prio, int kern); 48 49 bool l2cap_is_socket(struct socket *sock) 50 { 51 return sock && sock->ops == &l2cap_sock_ops; 52 } 53 EXPORT_SYMBOL(l2cap_is_socket); 54 55 static int l2cap_validate_bredr_psm(u16 psm) 56 { 57 /* PSM must be odd and lsb of upper byte must be 0 */ 58 if ((psm & 0x0101) != 0x0001) 59 return -EINVAL; 60 61 /* Restrict usage of well-known PSMs */ 62 if (psm < L2CAP_PSM_DYN_START && !capable(CAP_NET_BIND_SERVICE)) 63 return -EACCES; 64 65 return 0; 66 } 67 68 static int l2cap_validate_le_psm(u16 psm) 69 { 70 /* Valid LE_PSM ranges are defined only until 0x00ff */ 71 if (psm > L2CAP_PSM_LE_DYN_END) 72 return -EINVAL; 73 74 /* Restrict fixed, SIG assigned PSM values to CAP_NET_BIND_SERVICE */ 75 if (psm < L2CAP_PSM_LE_DYN_START && !capable(CAP_NET_BIND_SERVICE)) 76 return -EACCES; 77 78 return 0; 79 } 80 81 static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) 82 { 83 struct sock *sk = sock->sk; 84 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 85 struct sockaddr_l2 la; 86 int len, err = 0; 87 88 BT_DBG("sk %p", sk); 89 90 if (!addr || alen < offsetofend(struct sockaddr, sa_family) || 91 addr->sa_family != AF_BLUETOOTH) 92 return -EINVAL; 93 94 memset(&la, 0, sizeof(la)); 95 len = min_t(unsigned int, sizeof(la), alen); 96 memcpy(&la, addr, len); 97 98 if (la.l2_cid && la.l2_psm) 99 return -EINVAL; 100 101 if (!bdaddr_type_is_valid(la.l2_bdaddr_type)) 102 return -EINVAL; 103 104 if (bdaddr_type_is_le(la.l2_bdaddr_type)) { 105 /* We only allow ATT user space socket */ 106 if (la.l2_cid && 107 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT)) 108 return -EINVAL; 109 } 110 111 lock_sock(sk); 112 113 if (sk->sk_state != BT_OPEN) { 114 err = -EBADFD; 115 goto done; 116 } 117 118 if (la.l2_psm) { 119 __u16 psm = __le16_to_cpu(la.l2_psm); 120 121 if (la.l2_bdaddr_type == BDADDR_BREDR) 122 err = l2cap_validate_bredr_psm(psm); 123 else 124 err = l2cap_validate_le_psm(psm); 125 126 if (err) 127 goto done; 128 } 129 130 bacpy(&chan->src, &la.l2_bdaddr); 131 chan->src_type = la.l2_bdaddr_type; 132 133 if (la.l2_cid) 134 err = l2cap_add_scid(chan, __le16_to_cpu(la.l2_cid)); 135 else 136 err = l2cap_add_psm(chan, &la.l2_bdaddr, la.l2_psm); 137 138 if (err < 0) 139 goto done; 140 141 switch (chan->chan_type) { 142 case L2CAP_CHAN_CONN_LESS: 143 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_3DSP) 144 chan->sec_level = BT_SECURITY_SDP; 145 break; 146 case L2CAP_CHAN_CONN_ORIENTED: 147 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_SDP || 148 __le16_to_cpu(la.l2_psm) == L2CAP_PSM_RFCOMM) 149 chan->sec_level = BT_SECURITY_SDP; 150 break; 151 case L2CAP_CHAN_RAW: 152 chan->sec_level = BT_SECURITY_SDP; 153 break; 154 case L2CAP_CHAN_FIXED: 155 /* Fixed channels default to the L2CAP core not holding a 156 * hci_conn reference for them. For fixed channels mapping to 157 * L2CAP sockets we do want to hold a reference so set the 158 * appropriate flag to request it. 159 */ 160 set_bit(FLAG_HOLD_HCI_CONN, &chan->flags); 161 break; 162 } 163 164 if (chan->psm && bdaddr_type_is_le(chan->src_type)) 165 chan->mode = L2CAP_MODE_LE_FLOWCTL; 166 167 chan->state = BT_BOUND; 168 sk->sk_state = BT_BOUND; 169 170 done: 171 release_sock(sk); 172 return err; 173 } 174 175 static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, 176 int alen, int flags) 177 { 178 struct sock *sk = sock->sk; 179 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 180 struct sockaddr_l2 la; 181 int len, err = 0; 182 183 BT_DBG("sk %p", sk); 184 185 if (!addr || alen < offsetofend(struct sockaddr, sa_family) || 186 addr->sa_family != AF_BLUETOOTH) 187 return -EINVAL; 188 189 memset(&la, 0, sizeof(la)); 190 len = min_t(unsigned int, sizeof(la), alen); 191 memcpy(&la, addr, len); 192 193 if (la.l2_cid && la.l2_psm) 194 return -EINVAL; 195 196 if (!bdaddr_type_is_valid(la.l2_bdaddr_type)) 197 return -EINVAL; 198 199 /* Check that the socket wasn't bound to something that 200 * conflicts with the address given to connect(). If chan->src 201 * is BDADDR_ANY it means bind() was never used, in which case 202 * chan->src_type and la.l2_bdaddr_type do not need to match. 203 */ 204 if (chan->src_type == BDADDR_BREDR && bacmp(&chan->src, BDADDR_ANY) && 205 bdaddr_type_is_le(la.l2_bdaddr_type)) { 206 /* Old user space versions will try to incorrectly bind 207 * the ATT socket using BDADDR_BREDR. We need to accept 208 * this and fix up the source address type only when 209 * both the source CID and destination CID indicate 210 * ATT. Anything else is an invalid combination. 211 */ 212 if (chan->scid != L2CAP_CID_ATT || 213 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT)) 214 return -EINVAL; 215 216 /* We don't have the hdev available here to make a 217 * better decision on random vs public, but since all 218 * user space versions that exhibit this issue anyway do 219 * not support random local addresses assuming public 220 * here is good enough. 221 */ 222 chan->src_type = BDADDR_LE_PUBLIC; 223 } 224 225 if (chan->src_type != BDADDR_BREDR && la.l2_bdaddr_type == BDADDR_BREDR) 226 return -EINVAL; 227 228 if (bdaddr_type_is_le(la.l2_bdaddr_type)) { 229 /* We only allow ATT user space socket */ 230 if (la.l2_cid && 231 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT)) 232 return -EINVAL; 233 } 234 235 if (chan->psm && bdaddr_type_is_le(chan->src_type) && !chan->mode) 236 chan->mode = L2CAP_MODE_LE_FLOWCTL; 237 238 err = l2cap_chan_connect(chan, la.l2_psm, __le16_to_cpu(la.l2_cid), 239 &la.l2_bdaddr, la.l2_bdaddr_type); 240 if (err) 241 return err; 242 243 lock_sock(sk); 244 245 err = bt_sock_wait_state(sk, BT_CONNECTED, 246 sock_sndtimeo(sk, flags & O_NONBLOCK)); 247 248 release_sock(sk); 249 250 return err; 251 } 252 253 static int l2cap_sock_listen(struct socket *sock, int backlog) 254 { 255 struct sock *sk = sock->sk; 256 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 257 int err = 0; 258 259 BT_DBG("sk %p backlog %d", sk, backlog); 260 261 lock_sock(sk); 262 263 if (sk->sk_state != BT_BOUND) { 264 err = -EBADFD; 265 goto done; 266 } 267 268 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) { 269 err = -EINVAL; 270 goto done; 271 } 272 273 switch (chan->mode) { 274 case L2CAP_MODE_BASIC: 275 case L2CAP_MODE_LE_FLOWCTL: 276 break; 277 case L2CAP_MODE_EXT_FLOWCTL: 278 if (!enable_ecred) { 279 err = -EOPNOTSUPP; 280 goto done; 281 } 282 break; 283 case L2CAP_MODE_ERTM: 284 case L2CAP_MODE_STREAMING: 285 if (!disable_ertm) 286 break; 287 /* fall through */ 288 default: 289 err = -EOPNOTSUPP; 290 goto done; 291 } 292 293 sk->sk_max_ack_backlog = backlog; 294 sk->sk_ack_backlog = 0; 295 296 /* Listening channels need to use nested locking in order not to 297 * cause lockdep warnings when the created child channels end up 298 * being locked in the same thread as the parent channel. 299 */ 300 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT); 301 302 chan->state = BT_LISTEN; 303 sk->sk_state = BT_LISTEN; 304 305 done: 306 release_sock(sk); 307 return err; 308 } 309 310 static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, 311 int flags, bool kern) 312 { 313 DEFINE_WAIT_FUNC(wait, woken_wake_function); 314 struct sock *sk = sock->sk, *nsk; 315 long timeo; 316 int err = 0; 317 318 lock_sock_nested(sk, L2CAP_NESTING_PARENT); 319 320 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 321 322 BT_DBG("sk %p timeo %ld", sk, timeo); 323 324 /* Wait for an incoming connection. (wake-one). */ 325 add_wait_queue_exclusive(sk_sleep(sk), &wait); 326 while (1) { 327 if (sk->sk_state != BT_LISTEN) { 328 err = -EBADFD; 329 break; 330 } 331 332 nsk = bt_accept_dequeue(sk, newsock); 333 if (nsk) 334 break; 335 336 if (!timeo) { 337 err = -EAGAIN; 338 break; 339 } 340 341 if (signal_pending(current)) { 342 err = sock_intr_errno(timeo); 343 break; 344 } 345 346 release_sock(sk); 347 348 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 349 350 lock_sock_nested(sk, L2CAP_NESTING_PARENT); 351 } 352 remove_wait_queue(sk_sleep(sk), &wait); 353 354 if (err) 355 goto done; 356 357 newsock->state = SS_CONNECTED; 358 359 BT_DBG("new socket %p", nsk); 360 361 done: 362 release_sock(sk); 363 return err; 364 } 365 366 static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, 367 int peer) 368 { 369 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; 370 struct sock *sk = sock->sk; 371 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 372 373 BT_DBG("sock %p, sk %p", sock, sk); 374 375 if (peer && sk->sk_state != BT_CONNECTED && 376 sk->sk_state != BT_CONNECT && sk->sk_state != BT_CONNECT2 && 377 sk->sk_state != BT_CONFIG) 378 return -ENOTCONN; 379 380 memset(la, 0, sizeof(struct sockaddr_l2)); 381 addr->sa_family = AF_BLUETOOTH; 382 383 la->l2_psm = chan->psm; 384 385 if (peer) { 386 bacpy(&la->l2_bdaddr, &chan->dst); 387 la->l2_cid = cpu_to_le16(chan->dcid); 388 la->l2_bdaddr_type = chan->dst_type; 389 } else { 390 bacpy(&la->l2_bdaddr, &chan->src); 391 la->l2_cid = cpu_to_le16(chan->scid); 392 la->l2_bdaddr_type = chan->src_type; 393 } 394 395 return sizeof(struct sockaddr_l2); 396 } 397 398 static int l2cap_get_mode(struct l2cap_chan *chan) 399 { 400 switch (chan->mode) { 401 case L2CAP_MODE_BASIC: 402 return BT_MODE_BASIC; 403 case L2CAP_MODE_ERTM: 404 return BT_MODE_ERTM; 405 case L2CAP_MODE_STREAMING: 406 return BT_MODE_STREAMING; 407 case L2CAP_MODE_LE_FLOWCTL: 408 return BT_MODE_LE_FLOWCTL; 409 case L2CAP_MODE_EXT_FLOWCTL: 410 return BT_MODE_EXT_FLOWCTL; 411 } 412 413 return -EINVAL; 414 } 415 416 static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, 417 char __user *optval, int __user *optlen) 418 { 419 struct sock *sk = sock->sk; 420 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 421 struct l2cap_options opts; 422 struct l2cap_conninfo cinfo; 423 int len, err = 0; 424 u32 opt; 425 426 BT_DBG("sk %p", sk); 427 428 if (get_user(len, optlen)) 429 return -EFAULT; 430 431 lock_sock(sk); 432 433 switch (optname) { 434 case L2CAP_OPTIONS: 435 /* LE sockets should use BT_SNDMTU/BT_RCVMTU, but since 436 * legacy ATT code depends on getsockopt for 437 * L2CAP_OPTIONS we need to let this pass. 438 */ 439 if (bdaddr_type_is_le(chan->src_type) && 440 chan->scid != L2CAP_CID_ATT) { 441 err = -EINVAL; 442 break; 443 } 444 445 /* Only BR/EDR modes are supported here */ 446 switch (chan->mode) { 447 case L2CAP_MODE_BASIC: 448 case L2CAP_MODE_ERTM: 449 case L2CAP_MODE_STREAMING: 450 break; 451 default: 452 err = -EINVAL; 453 break; 454 } 455 456 if (err < 0) 457 break; 458 459 memset(&opts, 0, sizeof(opts)); 460 opts.imtu = chan->imtu; 461 opts.omtu = chan->omtu; 462 opts.flush_to = chan->flush_to; 463 opts.mode = chan->mode; 464 opts.fcs = chan->fcs; 465 opts.max_tx = chan->max_tx; 466 opts.txwin_size = chan->tx_win; 467 468 BT_DBG("mode 0x%2.2x", chan->mode); 469 470 len = min_t(unsigned int, len, sizeof(opts)); 471 if (copy_to_user(optval, (char *) &opts, len)) 472 err = -EFAULT; 473 474 break; 475 476 case L2CAP_LM: 477 switch (chan->sec_level) { 478 case BT_SECURITY_LOW: 479 opt = L2CAP_LM_AUTH; 480 break; 481 case BT_SECURITY_MEDIUM: 482 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT; 483 break; 484 case BT_SECURITY_HIGH: 485 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT | 486 L2CAP_LM_SECURE; 487 break; 488 case BT_SECURITY_FIPS: 489 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT | 490 L2CAP_LM_SECURE | L2CAP_LM_FIPS; 491 break; 492 default: 493 opt = 0; 494 break; 495 } 496 497 if (test_bit(FLAG_ROLE_SWITCH, &chan->flags)) 498 opt |= L2CAP_LM_MASTER; 499 500 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) 501 opt |= L2CAP_LM_RELIABLE; 502 503 if (put_user(opt, (u32 __user *) optval)) 504 err = -EFAULT; 505 506 break; 507 508 case L2CAP_CONNINFO: 509 if (sk->sk_state != BT_CONNECTED && 510 !(sk->sk_state == BT_CONNECT2 && 511 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) { 512 err = -ENOTCONN; 513 break; 514 } 515 516 memset(&cinfo, 0, sizeof(cinfo)); 517 cinfo.hci_handle = chan->conn->hcon->handle; 518 memcpy(cinfo.dev_class, chan->conn->hcon->dev_class, 3); 519 520 len = min_t(unsigned int, len, sizeof(cinfo)); 521 if (copy_to_user(optval, (char *) &cinfo, len)) 522 err = -EFAULT; 523 524 break; 525 526 default: 527 err = -ENOPROTOOPT; 528 break; 529 } 530 531 release_sock(sk); 532 return err; 533 } 534 535 static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, 536 char __user *optval, int __user *optlen) 537 { 538 struct sock *sk = sock->sk; 539 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 540 struct bt_security sec; 541 struct bt_power pwr; 542 u32 phys; 543 int len, mode, err = 0; 544 545 BT_DBG("sk %p", sk); 546 547 if (level == SOL_L2CAP) 548 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen); 549 550 if (level != SOL_BLUETOOTH) 551 return -ENOPROTOOPT; 552 553 if (get_user(len, optlen)) 554 return -EFAULT; 555 556 lock_sock(sk); 557 558 switch (optname) { 559 case BT_SECURITY: 560 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED && 561 chan->chan_type != L2CAP_CHAN_FIXED && 562 chan->chan_type != L2CAP_CHAN_RAW) { 563 err = -EINVAL; 564 break; 565 } 566 567 memset(&sec, 0, sizeof(sec)); 568 if (chan->conn) { 569 sec.level = chan->conn->hcon->sec_level; 570 571 if (sk->sk_state == BT_CONNECTED) 572 sec.key_size = chan->conn->hcon->enc_key_size; 573 } else { 574 sec.level = chan->sec_level; 575 } 576 577 len = min_t(unsigned int, len, sizeof(sec)); 578 if (copy_to_user(optval, (char *) &sec, len)) 579 err = -EFAULT; 580 581 break; 582 583 case BT_DEFER_SETUP: 584 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { 585 err = -EINVAL; 586 break; 587 } 588 589 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags), 590 (u32 __user *) optval)) 591 err = -EFAULT; 592 593 break; 594 595 case BT_FLUSHABLE: 596 if (put_user(test_bit(FLAG_FLUSHABLE, &chan->flags), 597 (u32 __user *) optval)) 598 err = -EFAULT; 599 600 break; 601 602 case BT_POWER: 603 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM 604 && sk->sk_type != SOCK_RAW) { 605 err = -EINVAL; 606 break; 607 } 608 609 pwr.force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); 610 611 len = min_t(unsigned int, len, sizeof(pwr)); 612 if (copy_to_user(optval, (char *) &pwr, len)) 613 err = -EFAULT; 614 615 break; 616 617 case BT_CHANNEL_POLICY: 618 if (put_user(chan->chan_policy, (u32 __user *) optval)) 619 err = -EFAULT; 620 break; 621 622 case BT_SNDMTU: 623 if (!bdaddr_type_is_le(chan->src_type)) { 624 err = -EINVAL; 625 break; 626 } 627 628 if (sk->sk_state != BT_CONNECTED) { 629 err = -ENOTCONN; 630 break; 631 } 632 633 if (put_user(chan->omtu, (u16 __user *) optval)) 634 err = -EFAULT; 635 break; 636 637 case BT_RCVMTU: 638 if (!bdaddr_type_is_le(chan->src_type)) { 639 err = -EINVAL; 640 break; 641 } 642 643 if (put_user(chan->imtu, (u16 __user *) optval)) 644 err = -EFAULT; 645 break; 646 647 case BT_PHY: 648 if (sk->sk_state != BT_CONNECTED) { 649 err = -ENOTCONN; 650 break; 651 } 652 653 phys = hci_conn_get_phy(chan->conn->hcon); 654 655 if (put_user(phys, (u32 __user *) optval)) 656 err = -EFAULT; 657 break; 658 659 case BT_MODE: 660 if (!enable_ecred) { 661 err = -ENOPROTOOPT; 662 break; 663 } 664 665 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 666 err = -EINVAL; 667 break; 668 } 669 670 mode = l2cap_get_mode(chan); 671 if (mode < 0) { 672 err = mode; 673 break; 674 } 675 676 if (put_user(mode, (u8 __user *) optval)) 677 err = -EFAULT; 678 break; 679 680 default: 681 err = -ENOPROTOOPT; 682 break; 683 } 684 685 release_sock(sk); 686 return err; 687 } 688 689 static bool l2cap_valid_mtu(struct l2cap_chan *chan, u16 mtu) 690 { 691 switch (chan->scid) { 692 case L2CAP_CID_ATT: 693 if (mtu < L2CAP_LE_MIN_MTU) 694 return false; 695 break; 696 697 default: 698 if (mtu < L2CAP_DEFAULT_MIN_MTU) 699 return false; 700 } 701 702 return true; 703 } 704 705 static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, 706 char __user *optval, unsigned int optlen) 707 { 708 struct sock *sk = sock->sk; 709 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 710 struct l2cap_options opts; 711 int len, err = 0; 712 u32 opt; 713 714 BT_DBG("sk %p", sk); 715 716 lock_sock(sk); 717 718 switch (optname) { 719 case L2CAP_OPTIONS: 720 if (bdaddr_type_is_le(chan->src_type)) { 721 err = -EINVAL; 722 break; 723 } 724 725 if (sk->sk_state == BT_CONNECTED) { 726 err = -EINVAL; 727 break; 728 } 729 730 opts.imtu = chan->imtu; 731 opts.omtu = chan->omtu; 732 opts.flush_to = chan->flush_to; 733 opts.mode = chan->mode; 734 opts.fcs = chan->fcs; 735 opts.max_tx = chan->max_tx; 736 opts.txwin_size = chan->tx_win; 737 738 len = min_t(unsigned int, sizeof(opts), optlen); 739 if (copy_from_user((char *) &opts, optval, len)) { 740 err = -EFAULT; 741 break; 742 } 743 744 if (opts.txwin_size > L2CAP_DEFAULT_EXT_WINDOW) { 745 err = -EINVAL; 746 break; 747 } 748 749 if (!l2cap_valid_mtu(chan, opts.imtu)) { 750 err = -EINVAL; 751 break; 752 } 753 754 /* Only BR/EDR modes are supported here */ 755 switch (opts.mode) { 756 case L2CAP_MODE_BASIC: 757 clear_bit(CONF_STATE2_DEVICE, &chan->conf_state); 758 break; 759 case L2CAP_MODE_ERTM: 760 case L2CAP_MODE_STREAMING: 761 if (!disable_ertm) 762 break; 763 /* fall through */ 764 default: 765 err = -EINVAL; 766 break; 767 } 768 769 if (err < 0) 770 break; 771 772 chan->mode = opts.mode; 773 774 BT_DBG("mode 0x%2.2x", chan->mode); 775 776 chan->imtu = opts.imtu; 777 chan->omtu = opts.omtu; 778 chan->fcs = opts.fcs; 779 chan->max_tx = opts.max_tx; 780 chan->tx_win = opts.txwin_size; 781 chan->flush_to = opts.flush_to; 782 break; 783 784 case L2CAP_LM: 785 if (get_user(opt, (u32 __user *) optval)) { 786 err = -EFAULT; 787 break; 788 } 789 790 if (opt & L2CAP_LM_FIPS) { 791 err = -EINVAL; 792 break; 793 } 794 795 if (opt & L2CAP_LM_AUTH) 796 chan->sec_level = BT_SECURITY_LOW; 797 if (opt & L2CAP_LM_ENCRYPT) 798 chan->sec_level = BT_SECURITY_MEDIUM; 799 if (opt & L2CAP_LM_SECURE) 800 chan->sec_level = BT_SECURITY_HIGH; 801 802 if (opt & L2CAP_LM_MASTER) 803 set_bit(FLAG_ROLE_SWITCH, &chan->flags); 804 else 805 clear_bit(FLAG_ROLE_SWITCH, &chan->flags); 806 807 if (opt & L2CAP_LM_RELIABLE) 808 set_bit(FLAG_FORCE_RELIABLE, &chan->flags); 809 else 810 clear_bit(FLAG_FORCE_RELIABLE, &chan->flags); 811 break; 812 813 default: 814 err = -ENOPROTOOPT; 815 break; 816 } 817 818 release_sock(sk); 819 return err; 820 } 821 822 static int l2cap_set_mode(struct l2cap_chan *chan, u8 mode) 823 { 824 switch (mode) { 825 case BT_MODE_BASIC: 826 if (bdaddr_type_is_le(chan->src_type)) 827 return -EINVAL; 828 mode = L2CAP_MODE_BASIC; 829 clear_bit(CONF_STATE2_DEVICE, &chan->conf_state); 830 break; 831 case BT_MODE_ERTM: 832 if (!disable_ertm || bdaddr_type_is_le(chan->src_type)) 833 return -EINVAL; 834 mode = L2CAP_MODE_ERTM; 835 break; 836 case BT_MODE_STREAMING: 837 if (!disable_ertm || bdaddr_type_is_le(chan->src_type)) 838 return -EINVAL; 839 mode = L2CAP_MODE_STREAMING; 840 break; 841 case BT_MODE_LE_FLOWCTL: 842 if (!bdaddr_type_is_le(chan->src_type)) 843 return -EINVAL; 844 mode = L2CAP_MODE_LE_FLOWCTL; 845 break; 846 case BT_MODE_EXT_FLOWCTL: 847 /* TODO: Add support for ECRED PDUs to BR/EDR */ 848 if (!bdaddr_type_is_le(chan->src_type)) 849 return -EINVAL; 850 mode = L2CAP_MODE_EXT_FLOWCTL; 851 break; 852 default: 853 return -EINVAL; 854 } 855 856 chan->mode = mode; 857 858 return 0; 859 } 860 861 static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, 862 char __user *optval, unsigned int optlen) 863 { 864 struct sock *sk = sock->sk; 865 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 866 struct bt_security sec; 867 struct bt_power pwr; 868 struct l2cap_conn *conn; 869 int len, err = 0; 870 u32 opt; 871 872 BT_DBG("sk %p", sk); 873 874 if (level == SOL_L2CAP) 875 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen); 876 877 if (level != SOL_BLUETOOTH) 878 return -ENOPROTOOPT; 879 880 lock_sock(sk); 881 882 switch (optname) { 883 case BT_SECURITY: 884 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED && 885 chan->chan_type != L2CAP_CHAN_FIXED && 886 chan->chan_type != L2CAP_CHAN_RAW) { 887 err = -EINVAL; 888 break; 889 } 890 891 sec.level = BT_SECURITY_LOW; 892 893 len = min_t(unsigned int, sizeof(sec), optlen); 894 if (copy_from_user((char *) &sec, optval, len)) { 895 err = -EFAULT; 896 break; 897 } 898 899 if (sec.level < BT_SECURITY_LOW || 900 sec.level > BT_SECURITY_FIPS) { 901 err = -EINVAL; 902 break; 903 } 904 905 chan->sec_level = sec.level; 906 907 if (!chan->conn) 908 break; 909 910 conn = chan->conn; 911 912 /* change security for LE channels */ 913 if (chan->scid == L2CAP_CID_ATT) { 914 if (smp_conn_security(conn->hcon, sec.level)) { 915 err = -EINVAL; 916 break; 917 } 918 919 set_bit(FLAG_PENDING_SECURITY, &chan->flags); 920 sk->sk_state = BT_CONFIG; 921 chan->state = BT_CONFIG; 922 923 /* or for ACL link */ 924 } else if ((sk->sk_state == BT_CONNECT2 && 925 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) || 926 sk->sk_state == BT_CONNECTED) { 927 if (!l2cap_chan_check_security(chan, true)) 928 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); 929 else 930 sk->sk_state_change(sk); 931 } else { 932 err = -EINVAL; 933 } 934 break; 935 936 case BT_DEFER_SETUP: 937 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { 938 err = -EINVAL; 939 break; 940 } 941 942 if (get_user(opt, (u32 __user *) optval)) { 943 err = -EFAULT; 944 break; 945 } 946 947 if (opt) { 948 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags); 949 set_bit(FLAG_DEFER_SETUP, &chan->flags); 950 } else { 951 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags); 952 clear_bit(FLAG_DEFER_SETUP, &chan->flags); 953 } 954 break; 955 956 case BT_FLUSHABLE: 957 if (get_user(opt, (u32 __user *) optval)) { 958 err = -EFAULT; 959 break; 960 } 961 962 if (opt > BT_FLUSHABLE_ON) { 963 err = -EINVAL; 964 break; 965 } 966 967 if (opt == BT_FLUSHABLE_OFF) { 968 conn = chan->conn; 969 /* proceed further only when we have l2cap_conn and 970 No Flush support in the LM */ 971 if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) { 972 err = -EINVAL; 973 break; 974 } 975 } 976 977 if (opt) 978 set_bit(FLAG_FLUSHABLE, &chan->flags); 979 else 980 clear_bit(FLAG_FLUSHABLE, &chan->flags); 981 break; 982 983 case BT_POWER: 984 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED && 985 chan->chan_type != L2CAP_CHAN_RAW) { 986 err = -EINVAL; 987 break; 988 } 989 990 pwr.force_active = BT_POWER_FORCE_ACTIVE_ON; 991 992 len = min_t(unsigned int, sizeof(pwr), optlen); 993 if (copy_from_user((char *) &pwr, optval, len)) { 994 err = -EFAULT; 995 break; 996 } 997 998 if (pwr.force_active) 999 set_bit(FLAG_FORCE_ACTIVE, &chan->flags); 1000 else 1001 clear_bit(FLAG_FORCE_ACTIVE, &chan->flags); 1002 break; 1003 1004 case BT_CHANNEL_POLICY: 1005 if (get_user(opt, (u32 __user *) optval)) { 1006 err = -EFAULT; 1007 break; 1008 } 1009 1010 if (opt > BT_CHANNEL_POLICY_AMP_PREFERRED) { 1011 err = -EINVAL; 1012 break; 1013 } 1014 1015 if (chan->mode != L2CAP_MODE_ERTM && 1016 chan->mode != L2CAP_MODE_STREAMING) { 1017 err = -EOPNOTSUPP; 1018 break; 1019 } 1020 1021 chan->chan_policy = (u8) opt; 1022 1023 if (sk->sk_state == BT_CONNECTED && 1024 chan->move_role == L2CAP_MOVE_ROLE_NONE) 1025 l2cap_move_start(chan); 1026 1027 break; 1028 1029 case BT_SNDMTU: 1030 if (!bdaddr_type_is_le(chan->src_type)) { 1031 err = -EINVAL; 1032 break; 1033 } 1034 1035 /* Setting is not supported as it's the remote side that 1036 * decides this. 1037 */ 1038 err = -EPERM; 1039 break; 1040 1041 case BT_RCVMTU: 1042 if (!bdaddr_type_is_le(chan->src_type)) { 1043 err = -EINVAL; 1044 break; 1045 } 1046 1047 if (chan->mode == L2CAP_MODE_LE_FLOWCTL && 1048 sk->sk_state == BT_CONNECTED) { 1049 err = -EISCONN; 1050 break; 1051 } 1052 1053 if (get_user(opt, (u16 __user *) optval)) { 1054 err = -EFAULT; 1055 break; 1056 } 1057 1058 if (chan->mode == L2CAP_MODE_EXT_FLOWCTL && 1059 sk->sk_state == BT_CONNECTED) 1060 err = l2cap_chan_reconfigure(chan, opt); 1061 else 1062 chan->imtu = opt; 1063 1064 break; 1065 1066 case BT_MODE: 1067 if (!enable_ecred) { 1068 err = -ENOPROTOOPT; 1069 break; 1070 } 1071 1072 BT_DBG("sk->sk_state %u", sk->sk_state); 1073 1074 if (sk->sk_state != BT_BOUND) { 1075 err = -EINVAL; 1076 break; 1077 } 1078 1079 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 1080 err = -EINVAL; 1081 break; 1082 } 1083 1084 if (get_user(opt, (u8 __user *) optval)) { 1085 err = -EFAULT; 1086 break; 1087 } 1088 1089 BT_DBG("opt %u", opt); 1090 1091 err = l2cap_set_mode(chan, opt); 1092 if (err) 1093 break; 1094 1095 BT_DBG("mode 0x%2.2x", chan->mode); 1096 1097 break; 1098 1099 default: 1100 err = -ENOPROTOOPT; 1101 break; 1102 } 1103 1104 release_sock(sk); 1105 return err; 1106 } 1107 1108 static int l2cap_sock_sendmsg(struct socket *sock, struct msghdr *msg, 1109 size_t len) 1110 { 1111 struct sock *sk = sock->sk; 1112 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 1113 int err; 1114 1115 BT_DBG("sock %p, sk %p", sock, sk); 1116 1117 err = sock_error(sk); 1118 if (err) 1119 return err; 1120 1121 if (msg->msg_flags & MSG_OOB) 1122 return -EOPNOTSUPP; 1123 1124 if (sk->sk_state != BT_CONNECTED) 1125 return -ENOTCONN; 1126 1127 lock_sock(sk); 1128 err = bt_sock_wait_ready(sk, msg->msg_flags); 1129 release_sock(sk); 1130 if (err) 1131 return err; 1132 1133 l2cap_chan_lock(chan); 1134 err = l2cap_chan_send(chan, msg, len); 1135 l2cap_chan_unlock(chan); 1136 1137 return err; 1138 } 1139 1140 static int l2cap_sock_recvmsg(struct socket *sock, struct msghdr *msg, 1141 size_t len, int flags) 1142 { 1143 struct sock *sk = sock->sk; 1144 struct l2cap_pinfo *pi = l2cap_pi(sk); 1145 int err; 1146 1147 lock_sock(sk); 1148 1149 if (sk->sk_state == BT_CONNECT2 && test_bit(BT_SK_DEFER_SETUP, 1150 &bt_sk(sk)->flags)) { 1151 if (pi->chan->mode == L2CAP_MODE_EXT_FLOWCTL) { 1152 sk->sk_state = BT_CONNECTED; 1153 pi->chan->state = BT_CONNECTED; 1154 __l2cap_ecred_conn_rsp_defer(pi->chan); 1155 } else if (bdaddr_type_is_le(pi->chan->src_type)) { 1156 sk->sk_state = BT_CONNECTED; 1157 pi->chan->state = BT_CONNECTED; 1158 __l2cap_le_connect_rsp_defer(pi->chan); 1159 } else { 1160 sk->sk_state = BT_CONFIG; 1161 pi->chan->state = BT_CONFIG; 1162 __l2cap_connect_rsp_defer(pi->chan); 1163 } 1164 1165 err = 0; 1166 goto done; 1167 } 1168 1169 release_sock(sk); 1170 1171 if (sock->type == SOCK_STREAM) 1172 err = bt_sock_stream_recvmsg(sock, msg, len, flags); 1173 else 1174 err = bt_sock_recvmsg(sock, msg, len, flags); 1175 1176 if (pi->chan->mode != L2CAP_MODE_ERTM) 1177 return err; 1178 1179 /* Attempt to put pending rx data in the socket buffer */ 1180 1181 lock_sock(sk); 1182 1183 if (!test_bit(CONN_LOCAL_BUSY, &pi->chan->conn_state)) 1184 goto done; 1185 1186 if (pi->rx_busy_skb) { 1187 if (!__sock_queue_rcv_skb(sk, pi->rx_busy_skb)) 1188 pi->rx_busy_skb = NULL; 1189 else 1190 goto done; 1191 } 1192 1193 /* Restore data flow when half of the receive buffer is 1194 * available. This avoids resending large numbers of 1195 * frames. 1196 */ 1197 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf >> 1) 1198 l2cap_chan_busy(pi->chan, 0); 1199 1200 done: 1201 release_sock(sk); 1202 return err; 1203 } 1204 1205 /* Kill socket (only if zapped and orphan) 1206 * Must be called on unlocked socket, with l2cap channel lock. 1207 */ 1208 static void l2cap_sock_kill(struct sock *sk) 1209 { 1210 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) 1211 return; 1212 1213 BT_DBG("sk %p state %s", sk, state_to_string(sk->sk_state)); 1214 1215 /* Kill poor orphan */ 1216 1217 l2cap_chan_put(l2cap_pi(sk)->chan); 1218 sock_set_flag(sk, SOCK_DEAD); 1219 sock_put(sk); 1220 } 1221 1222 static int __l2cap_wait_ack(struct sock *sk, struct l2cap_chan *chan) 1223 { 1224 DECLARE_WAITQUEUE(wait, current); 1225 int err = 0; 1226 int timeo = L2CAP_WAIT_ACK_POLL_PERIOD; 1227 /* Timeout to prevent infinite loop */ 1228 unsigned long timeout = jiffies + L2CAP_WAIT_ACK_TIMEOUT; 1229 1230 add_wait_queue(sk_sleep(sk), &wait); 1231 set_current_state(TASK_INTERRUPTIBLE); 1232 do { 1233 BT_DBG("Waiting for %d ACKs, timeout %04d ms", 1234 chan->unacked_frames, time_after(jiffies, timeout) ? 0 : 1235 jiffies_to_msecs(timeout - jiffies)); 1236 1237 if (!timeo) 1238 timeo = L2CAP_WAIT_ACK_POLL_PERIOD; 1239 1240 if (signal_pending(current)) { 1241 err = sock_intr_errno(timeo); 1242 break; 1243 } 1244 1245 release_sock(sk); 1246 timeo = schedule_timeout(timeo); 1247 lock_sock(sk); 1248 set_current_state(TASK_INTERRUPTIBLE); 1249 1250 err = sock_error(sk); 1251 if (err) 1252 break; 1253 1254 if (time_after(jiffies, timeout)) { 1255 err = -ENOLINK; 1256 break; 1257 } 1258 1259 } while (chan->unacked_frames > 0 && 1260 chan->state == BT_CONNECTED); 1261 1262 set_current_state(TASK_RUNNING); 1263 remove_wait_queue(sk_sleep(sk), &wait); 1264 return err; 1265 } 1266 1267 static int l2cap_sock_shutdown(struct socket *sock, int how) 1268 { 1269 struct sock *sk = sock->sk; 1270 struct l2cap_chan *chan; 1271 struct l2cap_conn *conn; 1272 int err = 0; 1273 1274 BT_DBG("sock %p, sk %p", sock, sk); 1275 1276 if (!sk) 1277 return 0; 1278 1279 lock_sock(sk); 1280 1281 if (sk->sk_shutdown) 1282 goto shutdown_already; 1283 1284 BT_DBG("Handling sock shutdown"); 1285 1286 /* prevent sk structure from being freed whilst unlocked */ 1287 sock_hold(sk); 1288 1289 chan = l2cap_pi(sk)->chan; 1290 /* prevent chan structure from being freed whilst unlocked */ 1291 l2cap_chan_hold(chan); 1292 1293 BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); 1294 1295 if (chan->mode == L2CAP_MODE_ERTM && 1296 chan->unacked_frames > 0 && 1297 chan->state == BT_CONNECTED) { 1298 err = __l2cap_wait_ack(sk, chan); 1299 1300 /* After waiting for ACKs, check whether shutdown 1301 * has already been actioned to close the L2CAP 1302 * link such as by l2cap_disconnection_req(). 1303 */ 1304 if (sk->sk_shutdown) 1305 goto has_shutdown; 1306 } 1307 1308 sk->sk_shutdown = SHUTDOWN_MASK; 1309 release_sock(sk); 1310 1311 l2cap_chan_lock(chan); 1312 conn = chan->conn; 1313 if (conn) 1314 /* prevent conn structure from being freed */ 1315 l2cap_conn_get(conn); 1316 l2cap_chan_unlock(chan); 1317 1318 if (conn) 1319 /* mutex lock must be taken before l2cap_chan_lock() */ 1320 mutex_lock(&conn->chan_lock); 1321 1322 l2cap_chan_lock(chan); 1323 l2cap_chan_close(chan, 0); 1324 l2cap_chan_unlock(chan); 1325 1326 if (conn) { 1327 mutex_unlock(&conn->chan_lock); 1328 l2cap_conn_put(conn); 1329 } 1330 1331 lock_sock(sk); 1332 1333 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime && 1334 !(current->flags & PF_EXITING)) 1335 err = bt_sock_wait_state(sk, BT_CLOSED, 1336 sk->sk_lingertime); 1337 1338 has_shutdown: 1339 l2cap_chan_put(chan); 1340 sock_put(sk); 1341 1342 shutdown_already: 1343 if (!err && sk->sk_err) 1344 err = -sk->sk_err; 1345 1346 release_sock(sk); 1347 1348 BT_DBG("Sock shutdown complete err: %d", err); 1349 1350 return err; 1351 } 1352 1353 static int l2cap_sock_release(struct socket *sock) 1354 { 1355 struct sock *sk = sock->sk; 1356 int err; 1357 struct l2cap_chan *chan; 1358 1359 BT_DBG("sock %p, sk %p", sock, sk); 1360 1361 if (!sk) 1362 return 0; 1363 1364 bt_sock_unlink(&l2cap_sk_list, sk); 1365 1366 err = l2cap_sock_shutdown(sock, 2); 1367 chan = l2cap_pi(sk)->chan; 1368 1369 l2cap_chan_hold(chan); 1370 l2cap_chan_lock(chan); 1371 1372 sock_orphan(sk); 1373 l2cap_sock_kill(sk); 1374 1375 l2cap_chan_unlock(chan); 1376 l2cap_chan_put(chan); 1377 1378 return err; 1379 } 1380 1381 static void l2cap_sock_cleanup_listen(struct sock *parent) 1382 { 1383 struct sock *sk; 1384 1385 BT_DBG("parent %p state %s", parent, 1386 state_to_string(parent->sk_state)); 1387 1388 /* Close not yet accepted channels */ 1389 while ((sk = bt_accept_dequeue(parent, NULL))) { 1390 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 1391 1392 BT_DBG("child chan %p state %s", chan, 1393 state_to_string(chan->state)); 1394 1395 l2cap_chan_hold(chan); 1396 l2cap_chan_lock(chan); 1397 1398 __clear_chan_timer(chan); 1399 l2cap_chan_close(chan, ECONNRESET); 1400 l2cap_sock_kill(sk); 1401 1402 l2cap_chan_unlock(chan); 1403 l2cap_chan_put(chan); 1404 } 1405 } 1406 1407 static struct l2cap_chan *l2cap_sock_new_connection_cb(struct l2cap_chan *chan) 1408 { 1409 struct sock *sk, *parent = chan->data; 1410 1411 lock_sock(parent); 1412 1413 /* Check for backlog size */ 1414 if (sk_acceptq_is_full(parent)) { 1415 BT_DBG("backlog full %d", parent->sk_ack_backlog); 1416 release_sock(parent); 1417 return NULL; 1418 } 1419 1420 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, 1421 GFP_ATOMIC, 0); 1422 if (!sk) { 1423 release_sock(parent); 1424 return NULL; 1425 } 1426 1427 bt_sock_reclassify_lock(sk, BTPROTO_L2CAP); 1428 1429 l2cap_sock_init(sk, parent); 1430 1431 bt_accept_enqueue(parent, sk, false); 1432 1433 release_sock(parent); 1434 1435 return l2cap_pi(sk)->chan; 1436 } 1437 1438 static int l2cap_sock_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) 1439 { 1440 struct sock *sk = chan->data; 1441 int err; 1442 1443 lock_sock(sk); 1444 1445 if (l2cap_pi(sk)->rx_busy_skb) { 1446 err = -ENOMEM; 1447 goto done; 1448 } 1449 1450 if (chan->mode != L2CAP_MODE_ERTM && 1451 chan->mode != L2CAP_MODE_STREAMING) { 1452 /* Even if no filter is attached, we could potentially 1453 * get errors from security modules, etc. 1454 */ 1455 err = sk_filter(sk, skb); 1456 if (err) 1457 goto done; 1458 } 1459 1460 err = __sock_queue_rcv_skb(sk, skb); 1461 1462 /* For ERTM, handle one skb that doesn't fit into the recv 1463 * buffer. This is important to do because the data frames 1464 * have already been acked, so the skb cannot be discarded. 1465 * 1466 * Notify the l2cap core that the buffer is full, so the 1467 * LOCAL_BUSY state is entered and no more frames are 1468 * acked and reassembled until there is buffer space 1469 * available. 1470 */ 1471 if (err < 0 && chan->mode == L2CAP_MODE_ERTM) { 1472 l2cap_pi(sk)->rx_busy_skb = skb; 1473 l2cap_chan_busy(chan, 1); 1474 err = 0; 1475 } 1476 1477 done: 1478 release_sock(sk); 1479 1480 return err; 1481 } 1482 1483 static void l2cap_sock_close_cb(struct l2cap_chan *chan) 1484 { 1485 struct sock *sk = chan->data; 1486 1487 l2cap_sock_kill(sk); 1488 } 1489 1490 static void l2cap_sock_teardown_cb(struct l2cap_chan *chan, int err) 1491 { 1492 struct sock *sk = chan->data; 1493 struct sock *parent; 1494 1495 BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); 1496 1497 /* This callback can be called both for server (BT_LISTEN) 1498 * sockets as well as "normal" ones. To avoid lockdep warnings 1499 * with child socket locking (through l2cap_sock_cleanup_listen) 1500 * we need separation into separate nesting levels. The simplest 1501 * way to accomplish this is to inherit the nesting level used 1502 * for the channel. 1503 */ 1504 lock_sock_nested(sk, atomic_read(&chan->nesting)); 1505 1506 parent = bt_sk(sk)->parent; 1507 1508 sock_set_flag(sk, SOCK_ZAPPED); 1509 1510 switch (chan->state) { 1511 case BT_OPEN: 1512 case BT_BOUND: 1513 case BT_CLOSED: 1514 break; 1515 case BT_LISTEN: 1516 l2cap_sock_cleanup_listen(sk); 1517 sk->sk_state = BT_CLOSED; 1518 chan->state = BT_CLOSED; 1519 1520 break; 1521 default: 1522 sk->sk_state = BT_CLOSED; 1523 chan->state = BT_CLOSED; 1524 1525 sk->sk_err = err; 1526 1527 if (parent) { 1528 bt_accept_unlink(sk); 1529 parent->sk_data_ready(parent); 1530 } else { 1531 sk->sk_state_change(sk); 1532 } 1533 1534 break; 1535 } 1536 1537 release_sock(sk); 1538 } 1539 1540 static void l2cap_sock_state_change_cb(struct l2cap_chan *chan, int state, 1541 int err) 1542 { 1543 struct sock *sk = chan->data; 1544 1545 sk->sk_state = state; 1546 1547 if (err) 1548 sk->sk_err = err; 1549 } 1550 1551 static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan, 1552 unsigned long hdr_len, 1553 unsigned long len, int nb) 1554 { 1555 struct sock *sk = chan->data; 1556 struct sk_buff *skb; 1557 int err; 1558 1559 l2cap_chan_unlock(chan); 1560 skb = bt_skb_send_alloc(sk, hdr_len + len, nb, &err); 1561 l2cap_chan_lock(chan); 1562 1563 if (!skb) 1564 return ERR_PTR(err); 1565 1566 skb->priority = sk->sk_priority; 1567 1568 bt_cb(skb)->l2cap.chan = chan; 1569 1570 return skb; 1571 } 1572 1573 static void l2cap_sock_ready_cb(struct l2cap_chan *chan) 1574 { 1575 struct sock *sk = chan->data; 1576 struct sock *parent; 1577 1578 lock_sock(sk); 1579 1580 parent = bt_sk(sk)->parent; 1581 1582 BT_DBG("sk %p, parent %p", sk, parent); 1583 1584 sk->sk_state = BT_CONNECTED; 1585 sk->sk_state_change(sk); 1586 1587 if (parent) 1588 parent->sk_data_ready(parent); 1589 1590 release_sock(sk); 1591 } 1592 1593 static void l2cap_sock_defer_cb(struct l2cap_chan *chan) 1594 { 1595 struct sock *parent, *sk = chan->data; 1596 1597 lock_sock(sk); 1598 1599 parent = bt_sk(sk)->parent; 1600 if (parent) 1601 parent->sk_data_ready(parent); 1602 1603 release_sock(sk); 1604 } 1605 1606 static void l2cap_sock_resume_cb(struct l2cap_chan *chan) 1607 { 1608 struct sock *sk = chan->data; 1609 1610 if (test_and_clear_bit(FLAG_PENDING_SECURITY, &chan->flags)) { 1611 sk->sk_state = BT_CONNECTED; 1612 chan->state = BT_CONNECTED; 1613 } 1614 1615 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); 1616 sk->sk_state_change(sk); 1617 } 1618 1619 static void l2cap_sock_set_shutdown_cb(struct l2cap_chan *chan) 1620 { 1621 struct sock *sk = chan->data; 1622 1623 lock_sock(sk); 1624 sk->sk_shutdown = SHUTDOWN_MASK; 1625 release_sock(sk); 1626 } 1627 1628 static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan *chan) 1629 { 1630 struct sock *sk = chan->data; 1631 1632 return sk->sk_sndtimeo; 1633 } 1634 1635 static struct pid *l2cap_sock_get_peer_pid_cb(struct l2cap_chan *chan) 1636 { 1637 struct sock *sk = chan->data; 1638 1639 return sk->sk_peer_pid; 1640 } 1641 1642 static void l2cap_sock_suspend_cb(struct l2cap_chan *chan) 1643 { 1644 struct sock *sk = chan->data; 1645 1646 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); 1647 sk->sk_state_change(sk); 1648 } 1649 1650 static const struct l2cap_ops l2cap_chan_ops = { 1651 .name = "L2CAP Socket Interface", 1652 .new_connection = l2cap_sock_new_connection_cb, 1653 .recv = l2cap_sock_recv_cb, 1654 .close = l2cap_sock_close_cb, 1655 .teardown = l2cap_sock_teardown_cb, 1656 .state_change = l2cap_sock_state_change_cb, 1657 .ready = l2cap_sock_ready_cb, 1658 .defer = l2cap_sock_defer_cb, 1659 .resume = l2cap_sock_resume_cb, 1660 .suspend = l2cap_sock_suspend_cb, 1661 .set_shutdown = l2cap_sock_set_shutdown_cb, 1662 .get_sndtimeo = l2cap_sock_get_sndtimeo_cb, 1663 .get_peer_pid = l2cap_sock_get_peer_pid_cb, 1664 .alloc_skb = l2cap_sock_alloc_skb_cb, 1665 }; 1666 1667 static void l2cap_sock_destruct(struct sock *sk) 1668 { 1669 BT_DBG("sk %p", sk); 1670 1671 if (l2cap_pi(sk)->chan) 1672 l2cap_chan_put(l2cap_pi(sk)->chan); 1673 1674 if (l2cap_pi(sk)->rx_busy_skb) { 1675 kfree_skb(l2cap_pi(sk)->rx_busy_skb); 1676 l2cap_pi(sk)->rx_busy_skb = NULL; 1677 } 1678 1679 skb_queue_purge(&sk->sk_receive_queue); 1680 skb_queue_purge(&sk->sk_write_queue); 1681 } 1682 1683 static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name, 1684 int *msg_namelen) 1685 { 1686 DECLARE_SOCKADDR(struct sockaddr_l2 *, la, msg_name); 1687 1688 memset(la, 0, sizeof(struct sockaddr_l2)); 1689 la->l2_family = AF_BLUETOOTH; 1690 la->l2_psm = bt_cb(skb)->l2cap.psm; 1691 bacpy(&la->l2_bdaddr, &bt_cb(skb)->l2cap.bdaddr); 1692 1693 *msg_namelen = sizeof(struct sockaddr_l2); 1694 } 1695 1696 static void l2cap_sock_init(struct sock *sk, struct sock *parent) 1697 { 1698 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 1699 1700 BT_DBG("sk %p", sk); 1701 1702 if (parent) { 1703 struct l2cap_chan *pchan = l2cap_pi(parent)->chan; 1704 1705 sk->sk_type = parent->sk_type; 1706 bt_sk(sk)->flags = bt_sk(parent)->flags; 1707 1708 chan->chan_type = pchan->chan_type; 1709 chan->imtu = pchan->imtu; 1710 chan->omtu = pchan->omtu; 1711 chan->conf_state = pchan->conf_state; 1712 chan->mode = pchan->mode; 1713 chan->fcs = pchan->fcs; 1714 chan->max_tx = pchan->max_tx; 1715 chan->tx_win = pchan->tx_win; 1716 chan->tx_win_max = pchan->tx_win_max; 1717 chan->sec_level = pchan->sec_level; 1718 chan->flags = pchan->flags; 1719 chan->tx_credits = pchan->tx_credits; 1720 chan->rx_credits = pchan->rx_credits; 1721 1722 if (chan->chan_type == L2CAP_CHAN_FIXED) { 1723 chan->scid = pchan->scid; 1724 chan->dcid = pchan->scid; 1725 } 1726 1727 security_sk_clone(parent, sk); 1728 } else { 1729 switch (sk->sk_type) { 1730 case SOCK_RAW: 1731 chan->chan_type = L2CAP_CHAN_RAW; 1732 break; 1733 case SOCK_DGRAM: 1734 chan->chan_type = L2CAP_CHAN_CONN_LESS; 1735 bt_sk(sk)->skb_msg_name = l2cap_skb_msg_name; 1736 break; 1737 case SOCK_SEQPACKET: 1738 case SOCK_STREAM: 1739 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED; 1740 break; 1741 } 1742 1743 chan->imtu = L2CAP_DEFAULT_MTU; 1744 chan->omtu = 0; 1745 if (!disable_ertm && sk->sk_type == SOCK_STREAM) { 1746 chan->mode = L2CAP_MODE_ERTM; 1747 set_bit(CONF_STATE2_DEVICE, &chan->conf_state); 1748 } else { 1749 chan->mode = L2CAP_MODE_BASIC; 1750 } 1751 1752 l2cap_chan_set_defaults(chan); 1753 } 1754 1755 /* Default config options */ 1756 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO; 1757 1758 chan->data = sk; 1759 chan->ops = &l2cap_chan_ops; 1760 } 1761 1762 static struct proto l2cap_proto = { 1763 .name = "L2CAP", 1764 .owner = THIS_MODULE, 1765 .obj_size = sizeof(struct l2cap_pinfo) 1766 }; 1767 1768 static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, 1769 int proto, gfp_t prio, int kern) 1770 { 1771 struct sock *sk; 1772 struct l2cap_chan *chan; 1773 1774 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto, kern); 1775 if (!sk) 1776 return NULL; 1777 1778 sock_init_data(sock, sk); 1779 INIT_LIST_HEAD(&bt_sk(sk)->accept_q); 1780 1781 sk->sk_destruct = l2cap_sock_destruct; 1782 sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT; 1783 1784 sock_reset_flag(sk, SOCK_ZAPPED); 1785 1786 sk->sk_protocol = proto; 1787 sk->sk_state = BT_OPEN; 1788 1789 chan = l2cap_chan_create(); 1790 if (!chan) { 1791 sk_free(sk); 1792 return NULL; 1793 } 1794 1795 l2cap_chan_hold(chan); 1796 1797 l2cap_pi(sk)->chan = chan; 1798 1799 return sk; 1800 } 1801 1802 static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol, 1803 int kern) 1804 { 1805 struct sock *sk; 1806 1807 BT_DBG("sock %p", sock); 1808 1809 sock->state = SS_UNCONNECTED; 1810 1811 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM && 1812 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) 1813 return -ESOCKTNOSUPPORT; 1814 1815 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) 1816 return -EPERM; 1817 1818 sock->ops = &l2cap_sock_ops; 1819 1820 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern); 1821 if (!sk) 1822 return -ENOMEM; 1823 1824 l2cap_sock_init(sk, NULL); 1825 bt_sock_link(&l2cap_sk_list, sk); 1826 return 0; 1827 } 1828 1829 static const struct proto_ops l2cap_sock_ops = { 1830 .family = PF_BLUETOOTH, 1831 .owner = THIS_MODULE, 1832 .release = l2cap_sock_release, 1833 .bind = l2cap_sock_bind, 1834 .connect = l2cap_sock_connect, 1835 .listen = l2cap_sock_listen, 1836 .accept = l2cap_sock_accept, 1837 .getname = l2cap_sock_getname, 1838 .sendmsg = l2cap_sock_sendmsg, 1839 .recvmsg = l2cap_sock_recvmsg, 1840 .poll = bt_sock_poll, 1841 .ioctl = bt_sock_ioctl, 1842 .gettstamp = sock_gettstamp, 1843 .mmap = sock_no_mmap, 1844 .socketpair = sock_no_socketpair, 1845 .shutdown = l2cap_sock_shutdown, 1846 .setsockopt = l2cap_sock_setsockopt, 1847 .getsockopt = l2cap_sock_getsockopt 1848 }; 1849 1850 static const struct net_proto_family l2cap_sock_family_ops = { 1851 .family = PF_BLUETOOTH, 1852 .owner = THIS_MODULE, 1853 .create = l2cap_sock_create, 1854 }; 1855 1856 int __init l2cap_init_sockets(void) 1857 { 1858 int err; 1859 1860 BUILD_BUG_ON(sizeof(struct sockaddr_l2) > sizeof(struct sockaddr)); 1861 1862 err = proto_register(&l2cap_proto, 0); 1863 if (err < 0) 1864 return err; 1865 1866 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops); 1867 if (err < 0) { 1868 BT_ERR("L2CAP socket registration failed"); 1869 goto error; 1870 } 1871 1872 err = bt_procfs_init(&init_net, "l2cap", &l2cap_sk_list, 1873 NULL); 1874 if (err < 0) { 1875 BT_ERR("Failed to create L2CAP proc file"); 1876 bt_sock_unregister(BTPROTO_L2CAP); 1877 goto error; 1878 } 1879 1880 BT_INFO("L2CAP socket layer initialized"); 1881 1882 return 0; 1883 1884 error: 1885 proto_unregister(&l2cap_proto); 1886 return err; 1887 } 1888 1889 void l2cap_cleanup_sockets(void) 1890 { 1891 bt_procfs_cleanup(&init_net, "l2cap"); 1892 bt_sock_unregister(BTPROTO_L2CAP); 1893 proto_unregister(&l2cap_proto); 1894 } 1895