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)) 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_ERTM: 278 case L2CAP_MODE_STREAMING: 279 if (!disable_ertm) 280 break; 281 /* fall through */ 282 default: 283 err = -EOPNOTSUPP; 284 goto done; 285 } 286 287 sk->sk_max_ack_backlog = backlog; 288 sk->sk_ack_backlog = 0; 289 290 /* Listening channels need to use nested locking in order not to 291 * cause lockdep warnings when the created child channels end up 292 * being locked in the same thread as the parent channel. 293 */ 294 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT); 295 296 chan->state = BT_LISTEN; 297 sk->sk_state = BT_LISTEN; 298 299 done: 300 release_sock(sk); 301 return err; 302 } 303 304 static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, 305 int flags, bool kern) 306 { 307 DEFINE_WAIT_FUNC(wait, woken_wake_function); 308 struct sock *sk = sock->sk, *nsk; 309 long timeo; 310 int err = 0; 311 312 lock_sock_nested(sk, L2CAP_NESTING_PARENT); 313 314 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 315 316 BT_DBG("sk %p timeo %ld", sk, timeo); 317 318 /* Wait for an incoming connection. (wake-one). */ 319 add_wait_queue_exclusive(sk_sleep(sk), &wait); 320 while (1) { 321 if (sk->sk_state != BT_LISTEN) { 322 err = -EBADFD; 323 break; 324 } 325 326 nsk = bt_accept_dequeue(sk, newsock); 327 if (nsk) 328 break; 329 330 if (!timeo) { 331 err = -EAGAIN; 332 break; 333 } 334 335 if (signal_pending(current)) { 336 err = sock_intr_errno(timeo); 337 break; 338 } 339 340 release_sock(sk); 341 342 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 343 344 lock_sock_nested(sk, L2CAP_NESTING_PARENT); 345 } 346 remove_wait_queue(sk_sleep(sk), &wait); 347 348 if (err) 349 goto done; 350 351 newsock->state = SS_CONNECTED; 352 353 BT_DBG("new socket %p", nsk); 354 355 done: 356 release_sock(sk); 357 return err; 358 } 359 360 static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, 361 int peer) 362 { 363 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; 364 struct sock *sk = sock->sk; 365 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 366 367 BT_DBG("sock %p, sk %p", sock, sk); 368 369 if (peer && sk->sk_state != BT_CONNECTED && 370 sk->sk_state != BT_CONNECT && sk->sk_state != BT_CONNECT2 && 371 sk->sk_state != BT_CONFIG) 372 return -ENOTCONN; 373 374 memset(la, 0, sizeof(struct sockaddr_l2)); 375 addr->sa_family = AF_BLUETOOTH; 376 377 la->l2_psm = chan->psm; 378 379 if (peer) { 380 bacpy(&la->l2_bdaddr, &chan->dst); 381 la->l2_cid = cpu_to_le16(chan->dcid); 382 la->l2_bdaddr_type = chan->dst_type; 383 } else { 384 bacpy(&la->l2_bdaddr, &chan->src); 385 la->l2_cid = cpu_to_le16(chan->scid); 386 la->l2_bdaddr_type = chan->src_type; 387 } 388 389 return sizeof(struct sockaddr_l2); 390 } 391 392 static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, 393 char __user *optval, int __user *optlen) 394 { 395 struct sock *sk = sock->sk; 396 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 397 struct l2cap_options opts; 398 struct l2cap_conninfo cinfo; 399 int len, err = 0; 400 u32 opt; 401 402 BT_DBG("sk %p", sk); 403 404 if (get_user(len, optlen)) 405 return -EFAULT; 406 407 lock_sock(sk); 408 409 switch (optname) { 410 case L2CAP_OPTIONS: 411 /* LE sockets should use BT_SNDMTU/BT_RCVMTU, but since 412 * legacy ATT code depends on getsockopt for 413 * L2CAP_OPTIONS we need to let this pass. 414 */ 415 if (bdaddr_type_is_le(chan->src_type) && 416 chan->scid != L2CAP_CID_ATT) { 417 err = -EINVAL; 418 break; 419 } 420 421 memset(&opts, 0, sizeof(opts)); 422 opts.imtu = chan->imtu; 423 opts.omtu = chan->omtu; 424 opts.flush_to = chan->flush_to; 425 opts.mode = chan->mode; 426 opts.fcs = chan->fcs; 427 opts.max_tx = chan->max_tx; 428 opts.txwin_size = chan->tx_win; 429 430 len = min_t(unsigned int, len, sizeof(opts)); 431 if (copy_to_user(optval, (char *) &opts, len)) 432 err = -EFAULT; 433 434 break; 435 436 case L2CAP_LM: 437 switch (chan->sec_level) { 438 case BT_SECURITY_LOW: 439 opt = L2CAP_LM_AUTH; 440 break; 441 case BT_SECURITY_MEDIUM: 442 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT; 443 break; 444 case BT_SECURITY_HIGH: 445 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT | 446 L2CAP_LM_SECURE; 447 break; 448 case BT_SECURITY_FIPS: 449 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT | 450 L2CAP_LM_SECURE | L2CAP_LM_FIPS; 451 break; 452 default: 453 opt = 0; 454 break; 455 } 456 457 if (test_bit(FLAG_ROLE_SWITCH, &chan->flags)) 458 opt |= L2CAP_LM_MASTER; 459 460 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) 461 opt |= L2CAP_LM_RELIABLE; 462 463 if (put_user(opt, (u32 __user *) optval)) 464 err = -EFAULT; 465 466 break; 467 468 case L2CAP_CONNINFO: 469 if (sk->sk_state != BT_CONNECTED && 470 !(sk->sk_state == BT_CONNECT2 && 471 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) { 472 err = -ENOTCONN; 473 break; 474 } 475 476 memset(&cinfo, 0, sizeof(cinfo)); 477 cinfo.hci_handle = chan->conn->hcon->handle; 478 memcpy(cinfo.dev_class, chan->conn->hcon->dev_class, 3); 479 480 len = min_t(unsigned int, len, sizeof(cinfo)); 481 if (copy_to_user(optval, (char *) &cinfo, len)) 482 err = -EFAULT; 483 484 break; 485 486 default: 487 err = -ENOPROTOOPT; 488 break; 489 } 490 491 release_sock(sk); 492 return err; 493 } 494 495 static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, 496 char __user *optval, int __user *optlen) 497 { 498 struct sock *sk = sock->sk; 499 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 500 struct bt_security sec; 501 struct bt_power pwr; 502 int len, err = 0; 503 504 BT_DBG("sk %p", sk); 505 506 if (level == SOL_L2CAP) 507 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen); 508 509 if (level != SOL_BLUETOOTH) 510 return -ENOPROTOOPT; 511 512 if (get_user(len, optlen)) 513 return -EFAULT; 514 515 lock_sock(sk); 516 517 switch (optname) { 518 case BT_SECURITY: 519 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED && 520 chan->chan_type != L2CAP_CHAN_FIXED && 521 chan->chan_type != L2CAP_CHAN_RAW) { 522 err = -EINVAL; 523 break; 524 } 525 526 memset(&sec, 0, sizeof(sec)); 527 if (chan->conn) { 528 sec.level = chan->conn->hcon->sec_level; 529 530 if (sk->sk_state == BT_CONNECTED) 531 sec.key_size = chan->conn->hcon->enc_key_size; 532 } else { 533 sec.level = chan->sec_level; 534 } 535 536 len = min_t(unsigned int, len, sizeof(sec)); 537 if (copy_to_user(optval, (char *) &sec, len)) 538 err = -EFAULT; 539 540 break; 541 542 case BT_DEFER_SETUP: 543 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { 544 err = -EINVAL; 545 break; 546 } 547 548 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags), 549 (u32 __user *) optval)) 550 err = -EFAULT; 551 552 break; 553 554 case BT_FLUSHABLE: 555 if (put_user(test_bit(FLAG_FLUSHABLE, &chan->flags), 556 (u32 __user *) optval)) 557 err = -EFAULT; 558 559 break; 560 561 case BT_POWER: 562 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM 563 && sk->sk_type != SOCK_RAW) { 564 err = -EINVAL; 565 break; 566 } 567 568 pwr.force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); 569 570 len = min_t(unsigned int, len, sizeof(pwr)); 571 if (copy_to_user(optval, (char *) &pwr, len)) 572 err = -EFAULT; 573 574 break; 575 576 case BT_CHANNEL_POLICY: 577 if (put_user(chan->chan_policy, (u32 __user *) optval)) 578 err = -EFAULT; 579 break; 580 581 case BT_SNDMTU: 582 if (!bdaddr_type_is_le(chan->src_type)) { 583 err = -EINVAL; 584 break; 585 } 586 587 if (sk->sk_state != BT_CONNECTED) { 588 err = -ENOTCONN; 589 break; 590 } 591 592 if (put_user(chan->omtu, (u16 __user *) optval)) 593 err = -EFAULT; 594 break; 595 596 case BT_RCVMTU: 597 if (!bdaddr_type_is_le(chan->src_type)) { 598 err = -EINVAL; 599 break; 600 } 601 602 if (put_user(chan->imtu, (u16 __user *) optval)) 603 err = -EFAULT; 604 break; 605 606 default: 607 err = -ENOPROTOOPT; 608 break; 609 } 610 611 release_sock(sk); 612 return err; 613 } 614 615 static bool l2cap_valid_mtu(struct l2cap_chan *chan, u16 mtu) 616 { 617 switch (chan->scid) { 618 case L2CAP_CID_ATT: 619 if (mtu < L2CAP_LE_MIN_MTU) 620 return false; 621 break; 622 623 default: 624 if (mtu < L2CAP_DEFAULT_MIN_MTU) 625 return false; 626 } 627 628 return true; 629 } 630 631 static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, 632 char __user *optval, unsigned int optlen) 633 { 634 struct sock *sk = sock->sk; 635 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 636 struct l2cap_options opts; 637 int len, err = 0; 638 u32 opt; 639 640 BT_DBG("sk %p", sk); 641 642 lock_sock(sk); 643 644 switch (optname) { 645 case L2CAP_OPTIONS: 646 if (bdaddr_type_is_le(chan->src_type)) { 647 err = -EINVAL; 648 break; 649 } 650 651 if (sk->sk_state == BT_CONNECTED) { 652 err = -EINVAL; 653 break; 654 } 655 656 opts.imtu = chan->imtu; 657 opts.omtu = chan->omtu; 658 opts.flush_to = chan->flush_to; 659 opts.mode = chan->mode; 660 opts.fcs = chan->fcs; 661 opts.max_tx = chan->max_tx; 662 opts.txwin_size = chan->tx_win; 663 664 len = min_t(unsigned int, sizeof(opts), optlen); 665 if (copy_from_user((char *) &opts, optval, len)) { 666 err = -EFAULT; 667 break; 668 } 669 670 if (opts.txwin_size > L2CAP_DEFAULT_EXT_WINDOW) { 671 err = -EINVAL; 672 break; 673 } 674 675 if (!l2cap_valid_mtu(chan, opts.imtu)) { 676 err = -EINVAL; 677 break; 678 } 679 680 chan->mode = opts.mode; 681 switch (chan->mode) { 682 case L2CAP_MODE_LE_FLOWCTL: 683 break; 684 case L2CAP_MODE_BASIC: 685 clear_bit(CONF_STATE2_DEVICE, &chan->conf_state); 686 break; 687 case L2CAP_MODE_ERTM: 688 case L2CAP_MODE_STREAMING: 689 if (!disable_ertm) 690 break; 691 /* fall through */ 692 default: 693 err = -EINVAL; 694 break; 695 } 696 697 chan->imtu = opts.imtu; 698 chan->omtu = opts.omtu; 699 chan->fcs = opts.fcs; 700 chan->max_tx = opts.max_tx; 701 chan->tx_win = opts.txwin_size; 702 chan->flush_to = opts.flush_to; 703 break; 704 705 case L2CAP_LM: 706 if (get_user(opt, (u32 __user *) optval)) { 707 err = -EFAULT; 708 break; 709 } 710 711 if (opt & L2CAP_LM_FIPS) { 712 err = -EINVAL; 713 break; 714 } 715 716 if (opt & L2CAP_LM_AUTH) 717 chan->sec_level = BT_SECURITY_LOW; 718 if (opt & L2CAP_LM_ENCRYPT) 719 chan->sec_level = BT_SECURITY_MEDIUM; 720 if (opt & L2CAP_LM_SECURE) 721 chan->sec_level = BT_SECURITY_HIGH; 722 723 if (opt & L2CAP_LM_MASTER) 724 set_bit(FLAG_ROLE_SWITCH, &chan->flags); 725 else 726 clear_bit(FLAG_ROLE_SWITCH, &chan->flags); 727 728 if (opt & L2CAP_LM_RELIABLE) 729 set_bit(FLAG_FORCE_RELIABLE, &chan->flags); 730 else 731 clear_bit(FLAG_FORCE_RELIABLE, &chan->flags); 732 break; 733 734 default: 735 err = -ENOPROTOOPT; 736 break; 737 } 738 739 release_sock(sk); 740 return err; 741 } 742 743 static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, 744 char __user *optval, unsigned int optlen) 745 { 746 struct sock *sk = sock->sk; 747 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 748 struct bt_security sec; 749 struct bt_power pwr; 750 struct l2cap_conn *conn; 751 int len, err = 0; 752 u32 opt; 753 754 BT_DBG("sk %p", sk); 755 756 if (level == SOL_L2CAP) 757 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen); 758 759 if (level != SOL_BLUETOOTH) 760 return -ENOPROTOOPT; 761 762 lock_sock(sk); 763 764 switch (optname) { 765 case BT_SECURITY: 766 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED && 767 chan->chan_type != L2CAP_CHAN_FIXED && 768 chan->chan_type != L2CAP_CHAN_RAW) { 769 err = -EINVAL; 770 break; 771 } 772 773 sec.level = BT_SECURITY_LOW; 774 775 len = min_t(unsigned int, sizeof(sec), optlen); 776 if (copy_from_user((char *) &sec, optval, len)) { 777 err = -EFAULT; 778 break; 779 } 780 781 if (sec.level < BT_SECURITY_LOW || 782 sec.level > BT_SECURITY_FIPS) { 783 err = -EINVAL; 784 break; 785 } 786 787 chan->sec_level = sec.level; 788 789 if (!chan->conn) 790 break; 791 792 conn = chan->conn; 793 794 /* change security for LE channels */ 795 if (chan->scid == L2CAP_CID_ATT) { 796 if (smp_conn_security(conn->hcon, sec.level)) { 797 err = -EINVAL; 798 break; 799 } 800 801 set_bit(FLAG_PENDING_SECURITY, &chan->flags); 802 sk->sk_state = BT_CONFIG; 803 chan->state = BT_CONFIG; 804 805 /* or for ACL link */ 806 } else if ((sk->sk_state == BT_CONNECT2 && 807 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) || 808 sk->sk_state == BT_CONNECTED) { 809 if (!l2cap_chan_check_security(chan, true)) 810 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); 811 else 812 sk->sk_state_change(sk); 813 } else { 814 err = -EINVAL; 815 } 816 break; 817 818 case BT_DEFER_SETUP: 819 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { 820 err = -EINVAL; 821 break; 822 } 823 824 if (get_user(opt, (u32 __user *) optval)) { 825 err = -EFAULT; 826 break; 827 } 828 829 if (opt) { 830 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags); 831 set_bit(FLAG_DEFER_SETUP, &chan->flags); 832 } else { 833 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags); 834 clear_bit(FLAG_DEFER_SETUP, &chan->flags); 835 } 836 break; 837 838 case BT_FLUSHABLE: 839 if (get_user(opt, (u32 __user *) optval)) { 840 err = -EFAULT; 841 break; 842 } 843 844 if (opt > BT_FLUSHABLE_ON) { 845 err = -EINVAL; 846 break; 847 } 848 849 if (opt == BT_FLUSHABLE_OFF) { 850 conn = chan->conn; 851 /* proceed further only when we have l2cap_conn and 852 No Flush support in the LM */ 853 if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) { 854 err = -EINVAL; 855 break; 856 } 857 } 858 859 if (opt) 860 set_bit(FLAG_FLUSHABLE, &chan->flags); 861 else 862 clear_bit(FLAG_FLUSHABLE, &chan->flags); 863 break; 864 865 case BT_POWER: 866 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED && 867 chan->chan_type != L2CAP_CHAN_RAW) { 868 err = -EINVAL; 869 break; 870 } 871 872 pwr.force_active = BT_POWER_FORCE_ACTIVE_ON; 873 874 len = min_t(unsigned int, sizeof(pwr), optlen); 875 if (copy_from_user((char *) &pwr, optval, len)) { 876 err = -EFAULT; 877 break; 878 } 879 880 if (pwr.force_active) 881 set_bit(FLAG_FORCE_ACTIVE, &chan->flags); 882 else 883 clear_bit(FLAG_FORCE_ACTIVE, &chan->flags); 884 break; 885 886 case BT_CHANNEL_POLICY: 887 if (get_user(opt, (u32 __user *) optval)) { 888 err = -EFAULT; 889 break; 890 } 891 892 if (opt > BT_CHANNEL_POLICY_AMP_PREFERRED) { 893 err = -EINVAL; 894 break; 895 } 896 897 if (chan->mode != L2CAP_MODE_ERTM && 898 chan->mode != L2CAP_MODE_STREAMING) { 899 err = -EOPNOTSUPP; 900 break; 901 } 902 903 chan->chan_policy = (u8) opt; 904 905 if (sk->sk_state == BT_CONNECTED && 906 chan->move_role == L2CAP_MOVE_ROLE_NONE) 907 l2cap_move_start(chan); 908 909 break; 910 911 case BT_SNDMTU: 912 if (!bdaddr_type_is_le(chan->src_type)) { 913 err = -EINVAL; 914 break; 915 } 916 917 /* Setting is not supported as it's the remote side that 918 * decides this. 919 */ 920 err = -EPERM; 921 break; 922 923 case BT_RCVMTU: 924 if (!bdaddr_type_is_le(chan->src_type)) { 925 err = -EINVAL; 926 break; 927 } 928 929 if (sk->sk_state == BT_CONNECTED) { 930 err = -EISCONN; 931 break; 932 } 933 934 if (get_user(opt, (u16 __user *) optval)) { 935 err = -EFAULT; 936 break; 937 } 938 939 chan->imtu = opt; 940 break; 941 942 default: 943 err = -ENOPROTOOPT; 944 break; 945 } 946 947 release_sock(sk); 948 return err; 949 } 950 951 static int l2cap_sock_sendmsg(struct socket *sock, struct msghdr *msg, 952 size_t len) 953 { 954 struct sock *sk = sock->sk; 955 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 956 int err; 957 958 BT_DBG("sock %p, sk %p", sock, sk); 959 960 err = sock_error(sk); 961 if (err) 962 return err; 963 964 if (msg->msg_flags & MSG_OOB) 965 return -EOPNOTSUPP; 966 967 if (sk->sk_state != BT_CONNECTED) 968 return -ENOTCONN; 969 970 lock_sock(sk); 971 err = bt_sock_wait_ready(sk, msg->msg_flags); 972 release_sock(sk); 973 if (err) 974 return err; 975 976 l2cap_chan_lock(chan); 977 err = l2cap_chan_send(chan, msg, len); 978 l2cap_chan_unlock(chan); 979 980 return err; 981 } 982 983 static int l2cap_sock_recvmsg(struct socket *sock, struct msghdr *msg, 984 size_t len, int flags) 985 { 986 struct sock *sk = sock->sk; 987 struct l2cap_pinfo *pi = l2cap_pi(sk); 988 int err; 989 990 lock_sock(sk); 991 992 if (sk->sk_state == BT_CONNECT2 && test_bit(BT_SK_DEFER_SETUP, 993 &bt_sk(sk)->flags)) { 994 if (bdaddr_type_is_le(pi->chan->src_type)) { 995 sk->sk_state = BT_CONNECTED; 996 pi->chan->state = BT_CONNECTED; 997 __l2cap_le_connect_rsp_defer(pi->chan); 998 } else { 999 sk->sk_state = BT_CONFIG; 1000 pi->chan->state = BT_CONFIG; 1001 __l2cap_connect_rsp_defer(pi->chan); 1002 } 1003 1004 err = 0; 1005 goto done; 1006 } 1007 1008 release_sock(sk); 1009 1010 if (sock->type == SOCK_STREAM) 1011 err = bt_sock_stream_recvmsg(sock, msg, len, flags); 1012 else 1013 err = bt_sock_recvmsg(sock, msg, len, flags); 1014 1015 if (pi->chan->mode != L2CAP_MODE_ERTM) 1016 return err; 1017 1018 /* Attempt to put pending rx data in the socket buffer */ 1019 1020 lock_sock(sk); 1021 1022 if (!test_bit(CONN_LOCAL_BUSY, &pi->chan->conn_state)) 1023 goto done; 1024 1025 if (pi->rx_busy_skb) { 1026 if (!__sock_queue_rcv_skb(sk, pi->rx_busy_skb)) 1027 pi->rx_busy_skb = NULL; 1028 else 1029 goto done; 1030 } 1031 1032 /* Restore data flow when half of the receive buffer is 1033 * available. This avoids resending large numbers of 1034 * frames. 1035 */ 1036 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf >> 1) 1037 l2cap_chan_busy(pi->chan, 0); 1038 1039 done: 1040 release_sock(sk); 1041 return err; 1042 } 1043 1044 /* Kill socket (only if zapped and orphan) 1045 * Must be called on unlocked socket. 1046 */ 1047 static void l2cap_sock_kill(struct sock *sk) 1048 { 1049 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) 1050 return; 1051 1052 BT_DBG("sk %p state %s", sk, state_to_string(sk->sk_state)); 1053 1054 /* Kill poor orphan */ 1055 1056 l2cap_chan_put(l2cap_pi(sk)->chan); 1057 sock_set_flag(sk, SOCK_DEAD); 1058 sock_put(sk); 1059 } 1060 1061 static int __l2cap_wait_ack(struct sock *sk, struct l2cap_chan *chan) 1062 { 1063 DECLARE_WAITQUEUE(wait, current); 1064 int err = 0; 1065 int timeo = L2CAP_WAIT_ACK_POLL_PERIOD; 1066 /* Timeout to prevent infinite loop */ 1067 unsigned long timeout = jiffies + L2CAP_WAIT_ACK_TIMEOUT; 1068 1069 add_wait_queue(sk_sleep(sk), &wait); 1070 set_current_state(TASK_INTERRUPTIBLE); 1071 do { 1072 BT_DBG("Waiting for %d ACKs, timeout %04d ms", 1073 chan->unacked_frames, time_after(jiffies, timeout) ? 0 : 1074 jiffies_to_msecs(timeout - jiffies)); 1075 1076 if (!timeo) 1077 timeo = L2CAP_WAIT_ACK_POLL_PERIOD; 1078 1079 if (signal_pending(current)) { 1080 err = sock_intr_errno(timeo); 1081 break; 1082 } 1083 1084 release_sock(sk); 1085 timeo = schedule_timeout(timeo); 1086 lock_sock(sk); 1087 set_current_state(TASK_INTERRUPTIBLE); 1088 1089 err = sock_error(sk); 1090 if (err) 1091 break; 1092 1093 if (time_after(jiffies, timeout)) { 1094 err = -ENOLINK; 1095 break; 1096 } 1097 1098 } while (chan->unacked_frames > 0 && 1099 chan->state == BT_CONNECTED); 1100 1101 set_current_state(TASK_RUNNING); 1102 remove_wait_queue(sk_sleep(sk), &wait); 1103 return err; 1104 } 1105 1106 static int l2cap_sock_shutdown(struct socket *sock, int how) 1107 { 1108 struct sock *sk = sock->sk; 1109 struct l2cap_chan *chan; 1110 struct l2cap_conn *conn; 1111 int err = 0; 1112 1113 BT_DBG("sock %p, sk %p", sock, sk); 1114 1115 if (!sk) 1116 return 0; 1117 1118 lock_sock(sk); 1119 1120 if (sk->sk_shutdown) 1121 goto shutdown_already; 1122 1123 BT_DBG("Handling sock shutdown"); 1124 1125 /* prevent sk structure from being freed whilst unlocked */ 1126 sock_hold(sk); 1127 1128 chan = l2cap_pi(sk)->chan; 1129 /* prevent chan structure from being freed whilst unlocked */ 1130 l2cap_chan_hold(chan); 1131 1132 BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); 1133 1134 if (chan->mode == L2CAP_MODE_ERTM && 1135 chan->unacked_frames > 0 && 1136 chan->state == BT_CONNECTED) { 1137 err = __l2cap_wait_ack(sk, chan); 1138 1139 /* After waiting for ACKs, check whether shutdown 1140 * has already been actioned to close the L2CAP 1141 * link such as by l2cap_disconnection_req(). 1142 */ 1143 if (sk->sk_shutdown) 1144 goto has_shutdown; 1145 } 1146 1147 sk->sk_shutdown = SHUTDOWN_MASK; 1148 release_sock(sk); 1149 1150 l2cap_chan_lock(chan); 1151 conn = chan->conn; 1152 if (conn) 1153 /* prevent conn structure from being freed */ 1154 l2cap_conn_get(conn); 1155 l2cap_chan_unlock(chan); 1156 1157 if (conn) 1158 /* mutex lock must be taken before l2cap_chan_lock() */ 1159 mutex_lock(&conn->chan_lock); 1160 1161 l2cap_chan_lock(chan); 1162 l2cap_chan_close(chan, 0); 1163 l2cap_chan_unlock(chan); 1164 1165 if (conn) { 1166 mutex_unlock(&conn->chan_lock); 1167 l2cap_conn_put(conn); 1168 } 1169 1170 lock_sock(sk); 1171 1172 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime && 1173 !(current->flags & PF_EXITING)) 1174 err = bt_sock_wait_state(sk, BT_CLOSED, 1175 sk->sk_lingertime); 1176 1177 has_shutdown: 1178 l2cap_chan_put(chan); 1179 sock_put(sk); 1180 1181 shutdown_already: 1182 if (!err && sk->sk_err) 1183 err = -sk->sk_err; 1184 1185 release_sock(sk); 1186 1187 BT_DBG("Sock shutdown complete err: %d", err); 1188 1189 return err; 1190 } 1191 1192 static int l2cap_sock_release(struct socket *sock) 1193 { 1194 struct sock *sk = sock->sk; 1195 int err; 1196 1197 BT_DBG("sock %p, sk %p", sock, sk); 1198 1199 if (!sk) 1200 return 0; 1201 1202 bt_sock_unlink(&l2cap_sk_list, sk); 1203 1204 err = l2cap_sock_shutdown(sock, 2); 1205 1206 sock_orphan(sk); 1207 l2cap_sock_kill(sk); 1208 return err; 1209 } 1210 1211 static void l2cap_sock_cleanup_listen(struct sock *parent) 1212 { 1213 struct sock *sk; 1214 1215 BT_DBG("parent %p state %s", parent, 1216 state_to_string(parent->sk_state)); 1217 1218 /* Close not yet accepted channels */ 1219 while ((sk = bt_accept_dequeue(parent, NULL))) { 1220 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 1221 1222 BT_DBG("child chan %p state %s", chan, 1223 state_to_string(chan->state)); 1224 1225 l2cap_chan_lock(chan); 1226 __clear_chan_timer(chan); 1227 l2cap_chan_close(chan, ECONNRESET); 1228 l2cap_chan_unlock(chan); 1229 1230 l2cap_sock_kill(sk); 1231 } 1232 } 1233 1234 static struct l2cap_chan *l2cap_sock_new_connection_cb(struct l2cap_chan *chan) 1235 { 1236 struct sock *sk, *parent = chan->data; 1237 1238 lock_sock(parent); 1239 1240 /* Check for backlog size */ 1241 if (sk_acceptq_is_full(parent)) { 1242 BT_DBG("backlog full %d", parent->sk_ack_backlog); 1243 release_sock(parent); 1244 return NULL; 1245 } 1246 1247 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, 1248 GFP_ATOMIC, 0); 1249 if (!sk) { 1250 release_sock(parent); 1251 return NULL; 1252 } 1253 1254 bt_sock_reclassify_lock(sk, BTPROTO_L2CAP); 1255 1256 l2cap_sock_init(sk, parent); 1257 1258 bt_accept_enqueue(parent, sk, false); 1259 1260 release_sock(parent); 1261 1262 return l2cap_pi(sk)->chan; 1263 } 1264 1265 static int l2cap_sock_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) 1266 { 1267 struct sock *sk = chan->data; 1268 int err; 1269 1270 lock_sock(sk); 1271 1272 if (l2cap_pi(sk)->rx_busy_skb) { 1273 err = -ENOMEM; 1274 goto done; 1275 } 1276 1277 if (chan->mode != L2CAP_MODE_ERTM && 1278 chan->mode != L2CAP_MODE_STREAMING) { 1279 /* Even if no filter is attached, we could potentially 1280 * get errors from security modules, etc. 1281 */ 1282 err = sk_filter(sk, skb); 1283 if (err) 1284 goto done; 1285 } 1286 1287 err = __sock_queue_rcv_skb(sk, skb); 1288 1289 /* For ERTM, handle one skb that doesn't fit into the recv 1290 * buffer. This is important to do because the data frames 1291 * have already been acked, so the skb cannot be discarded. 1292 * 1293 * Notify the l2cap core that the buffer is full, so the 1294 * LOCAL_BUSY state is entered and no more frames are 1295 * acked and reassembled until there is buffer space 1296 * available. 1297 */ 1298 if (err < 0 && chan->mode == L2CAP_MODE_ERTM) { 1299 l2cap_pi(sk)->rx_busy_skb = skb; 1300 l2cap_chan_busy(chan, 1); 1301 err = 0; 1302 } 1303 1304 done: 1305 release_sock(sk); 1306 1307 return err; 1308 } 1309 1310 static void l2cap_sock_close_cb(struct l2cap_chan *chan) 1311 { 1312 struct sock *sk = chan->data; 1313 1314 l2cap_sock_kill(sk); 1315 } 1316 1317 static void l2cap_sock_teardown_cb(struct l2cap_chan *chan, int err) 1318 { 1319 struct sock *sk = chan->data; 1320 struct sock *parent; 1321 1322 BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); 1323 1324 /* This callback can be called both for server (BT_LISTEN) 1325 * sockets as well as "normal" ones. To avoid lockdep warnings 1326 * with child socket locking (through l2cap_sock_cleanup_listen) 1327 * we need separation into separate nesting levels. The simplest 1328 * way to accomplish this is to inherit the nesting level used 1329 * for the channel. 1330 */ 1331 lock_sock_nested(sk, atomic_read(&chan->nesting)); 1332 1333 parent = bt_sk(sk)->parent; 1334 1335 sock_set_flag(sk, SOCK_ZAPPED); 1336 1337 switch (chan->state) { 1338 case BT_OPEN: 1339 case BT_BOUND: 1340 case BT_CLOSED: 1341 break; 1342 case BT_LISTEN: 1343 l2cap_sock_cleanup_listen(sk); 1344 sk->sk_state = BT_CLOSED; 1345 chan->state = BT_CLOSED; 1346 1347 break; 1348 default: 1349 sk->sk_state = BT_CLOSED; 1350 chan->state = BT_CLOSED; 1351 1352 sk->sk_err = err; 1353 1354 if (parent) { 1355 bt_accept_unlink(sk); 1356 parent->sk_data_ready(parent); 1357 } else { 1358 sk->sk_state_change(sk); 1359 } 1360 1361 break; 1362 } 1363 1364 release_sock(sk); 1365 } 1366 1367 static void l2cap_sock_state_change_cb(struct l2cap_chan *chan, int state, 1368 int err) 1369 { 1370 struct sock *sk = chan->data; 1371 1372 sk->sk_state = state; 1373 1374 if (err) 1375 sk->sk_err = err; 1376 } 1377 1378 static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan, 1379 unsigned long hdr_len, 1380 unsigned long len, int nb) 1381 { 1382 struct sock *sk = chan->data; 1383 struct sk_buff *skb; 1384 int err; 1385 1386 l2cap_chan_unlock(chan); 1387 skb = bt_skb_send_alloc(sk, hdr_len + len, nb, &err); 1388 l2cap_chan_lock(chan); 1389 1390 if (!skb) 1391 return ERR_PTR(err); 1392 1393 skb->priority = sk->sk_priority; 1394 1395 bt_cb(skb)->l2cap.chan = chan; 1396 1397 return skb; 1398 } 1399 1400 static void l2cap_sock_ready_cb(struct l2cap_chan *chan) 1401 { 1402 struct sock *sk = chan->data; 1403 struct sock *parent; 1404 1405 lock_sock(sk); 1406 1407 parent = bt_sk(sk)->parent; 1408 1409 BT_DBG("sk %p, parent %p", sk, parent); 1410 1411 sk->sk_state = BT_CONNECTED; 1412 sk->sk_state_change(sk); 1413 1414 if (parent) 1415 parent->sk_data_ready(parent); 1416 1417 release_sock(sk); 1418 } 1419 1420 static void l2cap_sock_defer_cb(struct l2cap_chan *chan) 1421 { 1422 struct sock *parent, *sk = chan->data; 1423 1424 lock_sock(sk); 1425 1426 parent = bt_sk(sk)->parent; 1427 if (parent) 1428 parent->sk_data_ready(parent); 1429 1430 release_sock(sk); 1431 } 1432 1433 static void l2cap_sock_resume_cb(struct l2cap_chan *chan) 1434 { 1435 struct sock *sk = chan->data; 1436 1437 if (test_and_clear_bit(FLAG_PENDING_SECURITY, &chan->flags)) { 1438 sk->sk_state = BT_CONNECTED; 1439 chan->state = BT_CONNECTED; 1440 } 1441 1442 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); 1443 sk->sk_state_change(sk); 1444 } 1445 1446 static void l2cap_sock_set_shutdown_cb(struct l2cap_chan *chan) 1447 { 1448 struct sock *sk = chan->data; 1449 1450 lock_sock(sk); 1451 sk->sk_shutdown = SHUTDOWN_MASK; 1452 release_sock(sk); 1453 } 1454 1455 static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan *chan) 1456 { 1457 struct sock *sk = chan->data; 1458 1459 return sk->sk_sndtimeo; 1460 } 1461 1462 static void l2cap_sock_suspend_cb(struct l2cap_chan *chan) 1463 { 1464 struct sock *sk = chan->data; 1465 1466 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); 1467 sk->sk_state_change(sk); 1468 } 1469 1470 static const struct l2cap_ops l2cap_chan_ops = { 1471 .name = "L2CAP Socket Interface", 1472 .new_connection = l2cap_sock_new_connection_cb, 1473 .recv = l2cap_sock_recv_cb, 1474 .close = l2cap_sock_close_cb, 1475 .teardown = l2cap_sock_teardown_cb, 1476 .state_change = l2cap_sock_state_change_cb, 1477 .ready = l2cap_sock_ready_cb, 1478 .defer = l2cap_sock_defer_cb, 1479 .resume = l2cap_sock_resume_cb, 1480 .suspend = l2cap_sock_suspend_cb, 1481 .set_shutdown = l2cap_sock_set_shutdown_cb, 1482 .get_sndtimeo = l2cap_sock_get_sndtimeo_cb, 1483 .alloc_skb = l2cap_sock_alloc_skb_cb, 1484 }; 1485 1486 static void l2cap_sock_destruct(struct sock *sk) 1487 { 1488 BT_DBG("sk %p", sk); 1489 1490 if (l2cap_pi(sk)->chan) 1491 l2cap_chan_put(l2cap_pi(sk)->chan); 1492 1493 if (l2cap_pi(sk)->rx_busy_skb) { 1494 kfree_skb(l2cap_pi(sk)->rx_busy_skb); 1495 l2cap_pi(sk)->rx_busy_skb = NULL; 1496 } 1497 1498 skb_queue_purge(&sk->sk_receive_queue); 1499 skb_queue_purge(&sk->sk_write_queue); 1500 } 1501 1502 static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name, 1503 int *msg_namelen) 1504 { 1505 DECLARE_SOCKADDR(struct sockaddr_l2 *, la, msg_name); 1506 1507 memset(la, 0, sizeof(struct sockaddr_l2)); 1508 la->l2_family = AF_BLUETOOTH; 1509 la->l2_psm = bt_cb(skb)->l2cap.psm; 1510 bacpy(&la->l2_bdaddr, &bt_cb(skb)->l2cap.bdaddr); 1511 1512 *msg_namelen = sizeof(struct sockaddr_l2); 1513 } 1514 1515 static void l2cap_sock_init(struct sock *sk, struct sock *parent) 1516 { 1517 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 1518 1519 BT_DBG("sk %p", sk); 1520 1521 if (parent) { 1522 struct l2cap_chan *pchan = l2cap_pi(parent)->chan; 1523 1524 sk->sk_type = parent->sk_type; 1525 bt_sk(sk)->flags = bt_sk(parent)->flags; 1526 1527 chan->chan_type = pchan->chan_type; 1528 chan->imtu = pchan->imtu; 1529 chan->omtu = pchan->omtu; 1530 chan->conf_state = pchan->conf_state; 1531 chan->mode = pchan->mode; 1532 chan->fcs = pchan->fcs; 1533 chan->max_tx = pchan->max_tx; 1534 chan->tx_win = pchan->tx_win; 1535 chan->tx_win_max = pchan->tx_win_max; 1536 chan->sec_level = pchan->sec_level; 1537 chan->flags = pchan->flags; 1538 chan->tx_credits = pchan->tx_credits; 1539 chan->rx_credits = pchan->rx_credits; 1540 1541 if (chan->chan_type == L2CAP_CHAN_FIXED) { 1542 chan->scid = pchan->scid; 1543 chan->dcid = pchan->scid; 1544 } 1545 1546 security_sk_clone(parent, sk); 1547 } else { 1548 switch (sk->sk_type) { 1549 case SOCK_RAW: 1550 chan->chan_type = L2CAP_CHAN_RAW; 1551 break; 1552 case SOCK_DGRAM: 1553 chan->chan_type = L2CAP_CHAN_CONN_LESS; 1554 bt_sk(sk)->skb_msg_name = l2cap_skb_msg_name; 1555 break; 1556 case SOCK_SEQPACKET: 1557 case SOCK_STREAM: 1558 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED; 1559 break; 1560 } 1561 1562 chan->imtu = L2CAP_DEFAULT_MTU; 1563 chan->omtu = 0; 1564 if (!disable_ertm && sk->sk_type == SOCK_STREAM) { 1565 chan->mode = L2CAP_MODE_ERTM; 1566 set_bit(CONF_STATE2_DEVICE, &chan->conf_state); 1567 } else { 1568 chan->mode = L2CAP_MODE_BASIC; 1569 } 1570 1571 l2cap_chan_set_defaults(chan); 1572 } 1573 1574 /* Default config options */ 1575 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO; 1576 1577 chan->data = sk; 1578 chan->ops = &l2cap_chan_ops; 1579 } 1580 1581 static struct proto l2cap_proto = { 1582 .name = "L2CAP", 1583 .owner = THIS_MODULE, 1584 .obj_size = sizeof(struct l2cap_pinfo) 1585 }; 1586 1587 static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, 1588 int proto, gfp_t prio, int kern) 1589 { 1590 struct sock *sk; 1591 struct l2cap_chan *chan; 1592 1593 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto, kern); 1594 if (!sk) 1595 return NULL; 1596 1597 sock_init_data(sock, sk); 1598 INIT_LIST_HEAD(&bt_sk(sk)->accept_q); 1599 1600 sk->sk_destruct = l2cap_sock_destruct; 1601 sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT; 1602 1603 sock_reset_flag(sk, SOCK_ZAPPED); 1604 1605 sk->sk_protocol = proto; 1606 sk->sk_state = BT_OPEN; 1607 1608 chan = l2cap_chan_create(); 1609 if (!chan) { 1610 sk_free(sk); 1611 return NULL; 1612 } 1613 1614 l2cap_chan_hold(chan); 1615 1616 l2cap_pi(sk)->chan = chan; 1617 1618 return sk; 1619 } 1620 1621 static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol, 1622 int kern) 1623 { 1624 struct sock *sk; 1625 1626 BT_DBG("sock %p", sock); 1627 1628 sock->state = SS_UNCONNECTED; 1629 1630 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM && 1631 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) 1632 return -ESOCKTNOSUPPORT; 1633 1634 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) 1635 return -EPERM; 1636 1637 sock->ops = &l2cap_sock_ops; 1638 1639 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern); 1640 if (!sk) 1641 return -ENOMEM; 1642 1643 l2cap_sock_init(sk, NULL); 1644 bt_sock_link(&l2cap_sk_list, sk); 1645 return 0; 1646 } 1647 1648 static const struct proto_ops l2cap_sock_ops = { 1649 .family = PF_BLUETOOTH, 1650 .owner = THIS_MODULE, 1651 .release = l2cap_sock_release, 1652 .bind = l2cap_sock_bind, 1653 .connect = l2cap_sock_connect, 1654 .listen = l2cap_sock_listen, 1655 .accept = l2cap_sock_accept, 1656 .getname = l2cap_sock_getname, 1657 .sendmsg = l2cap_sock_sendmsg, 1658 .recvmsg = l2cap_sock_recvmsg, 1659 .poll = bt_sock_poll, 1660 .ioctl = bt_sock_ioctl, 1661 .gettstamp = sock_gettstamp, 1662 .mmap = sock_no_mmap, 1663 .socketpair = sock_no_socketpair, 1664 .shutdown = l2cap_sock_shutdown, 1665 .setsockopt = l2cap_sock_setsockopt, 1666 .getsockopt = l2cap_sock_getsockopt 1667 }; 1668 1669 static const struct net_proto_family l2cap_sock_family_ops = { 1670 .family = PF_BLUETOOTH, 1671 .owner = THIS_MODULE, 1672 .create = l2cap_sock_create, 1673 }; 1674 1675 int __init l2cap_init_sockets(void) 1676 { 1677 int err; 1678 1679 BUILD_BUG_ON(sizeof(struct sockaddr_l2) > sizeof(struct sockaddr)); 1680 1681 err = proto_register(&l2cap_proto, 0); 1682 if (err < 0) 1683 return err; 1684 1685 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops); 1686 if (err < 0) { 1687 BT_ERR("L2CAP socket registration failed"); 1688 goto error; 1689 } 1690 1691 err = bt_procfs_init(&init_net, "l2cap", &l2cap_sk_list, 1692 NULL); 1693 if (err < 0) { 1694 BT_ERR("Failed to create L2CAP proc file"); 1695 bt_sock_unregister(BTPROTO_L2CAP); 1696 goto error; 1697 } 1698 1699 BT_INFO("L2CAP socket layer initialized"); 1700 1701 return 0; 1702 1703 error: 1704 proto_unregister(&l2cap_proto); 1705 return err; 1706 } 1707 1708 void l2cap_cleanup_sockets(void) 1709 { 1710 bt_procfs_cleanup(&init_net, "l2cap"); 1711 bt_sock_unregister(BTPROTO_L2CAP); 1712 proto_unregister(&l2cap_proto); 1713 } 1714