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 33 #include <net/bluetooth/bluetooth.h> 34 #include <net/bluetooth/hci_core.h> 35 #include <net/bluetooth/l2cap.h> 36 37 #include "smp.h" 38 39 static struct bt_sock_list l2cap_sk_list = { 40 .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock) 41 }; 42 43 static const struct proto_ops l2cap_sock_ops; 44 static void l2cap_sock_init(struct sock *sk, struct sock *parent); 45 static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, 46 int proto, gfp_t prio); 47 48 bool l2cap_is_socket(struct socket *sock) 49 { 50 return sock && sock->ops == &l2cap_sock_ops; 51 } 52 EXPORT_SYMBOL(l2cap_is_socket); 53 54 static int l2cap_validate_bredr_psm(u16 psm) 55 { 56 /* PSM must be odd and lsb of upper byte must be 0 */ 57 if ((psm & 0x0101) != 0x0001) 58 return -EINVAL; 59 60 /* Restrict usage of well-known PSMs */ 61 if (psm < 0x1001 && !capable(CAP_NET_BIND_SERVICE)) 62 return -EACCES; 63 64 return 0; 65 } 66 67 static int l2cap_validate_le_psm(u16 psm) 68 { 69 /* Valid LE_PSM ranges are defined only until 0x00ff */ 70 if (psm > 0x00ff) 71 return -EINVAL; 72 73 /* Restrict fixed, SIG assigned PSM values to CAP_NET_BIND_SERVICE */ 74 if (psm <= 0x007f && !capable(CAP_NET_BIND_SERVICE)) 75 return -EACCES; 76 77 return 0; 78 } 79 80 static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) 81 { 82 struct sock *sk = sock->sk; 83 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 84 struct sockaddr_l2 la; 85 int len, err = 0; 86 87 BT_DBG("sk %p", sk); 88 89 if (!addr || addr->sa_family != AF_BLUETOOTH) 90 return -EINVAL; 91 92 memset(&la, 0, sizeof(la)); 93 len = min_t(unsigned int, sizeof(la), alen); 94 memcpy(&la, addr, len); 95 96 if (la.l2_cid && la.l2_psm) 97 return -EINVAL; 98 99 if (!bdaddr_type_is_valid(la.l2_bdaddr_type)) 100 return -EINVAL; 101 102 if (la.l2_cid) { 103 /* When the socket gets created it defaults to 104 * CHAN_CONN_ORIENTED, so we need to overwrite the 105 * default here. 106 */ 107 chan->chan_type = L2CAP_CHAN_FIXED; 108 chan->omtu = L2CAP_DEFAULT_MTU; 109 } 110 111 if (bdaddr_type_is_le(la.l2_bdaddr_type)) { 112 /* We only allow ATT user space socket */ 113 if (la.l2_cid && 114 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT)) 115 return -EINVAL; 116 } 117 118 lock_sock(sk); 119 120 if (sk->sk_state != BT_OPEN) { 121 err = -EBADFD; 122 goto done; 123 } 124 125 if (la.l2_psm) { 126 __u16 psm = __le16_to_cpu(la.l2_psm); 127 128 if (la.l2_bdaddr_type == BDADDR_BREDR) 129 err = l2cap_validate_bredr_psm(psm); 130 else 131 err = l2cap_validate_le_psm(psm); 132 133 if (err) 134 goto done; 135 } 136 137 if (la.l2_cid) 138 err = l2cap_add_scid(chan, __le16_to_cpu(la.l2_cid)); 139 else 140 err = l2cap_add_psm(chan, &la.l2_bdaddr, la.l2_psm); 141 142 if (err < 0) 143 goto done; 144 145 switch (chan->chan_type) { 146 case L2CAP_CHAN_CONN_LESS: 147 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_3DSP) 148 chan->sec_level = BT_SECURITY_SDP; 149 break; 150 case L2CAP_CHAN_CONN_ORIENTED: 151 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_SDP || 152 __le16_to_cpu(la.l2_psm) == L2CAP_PSM_RFCOMM) 153 chan->sec_level = BT_SECURITY_SDP; 154 break; 155 case L2CAP_CHAN_RAW: 156 chan->sec_level = BT_SECURITY_SDP; 157 break; 158 } 159 160 bacpy(&chan->src, &la.l2_bdaddr); 161 chan->src_type = la.l2_bdaddr_type; 162 163 if (chan->psm && bdaddr_type_is_le(chan->src_type)) 164 chan->mode = L2CAP_MODE_LE_FLOWCTL; 165 166 chan->state = BT_BOUND; 167 sk->sk_state = BT_BOUND; 168 169 done: 170 release_sock(sk); 171 return err; 172 } 173 174 static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, 175 int alen, int flags) 176 { 177 struct sock *sk = sock->sk; 178 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 179 struct sockaddr_l2 la; 180 int len, err = 0; 181 182 BT_DBG("sk %p", sk); 183 184 if (!addr || alen < sizeof(addr->sa_family) || 185 addr->sa_family != AF_BLUETOOTH) 186 return -EINVAL; 187 188 memset(&la, 0, sizeof(la)); 189 len = min_t(unsigned int, sizeof(la), alen); 190 memcpy(&la, addr, len); 191 192 if (la.l2_cid && la.l2_psm) 193 return -EINVAL; 194 195 if (!bdaddr_type_is_valid(la.l2_bdaddr_type)) 196 return -EINVAL; 197 198 /* Check that the socket wasn't bound to something that 199 * conflicts with the address given to connect(). If chan->src 200 * is BDADDR_ANY it means bind() was never used, in which case 201 * chan->src_type and la.l2_bdaddr_type do not need to match. 202 */ 203 if (chan->src_type == BDADDR_BREDR && bacmp(&chan->src, BDADDR_ANY) && 204 bdaddr_type_is_le(la.l2_bdaddr_type)) { 205 /* Old user space versions will try to incorrectly bind 206 * the ATT socket using BDADDR_BREDR. We need to accept 207 * this and fix up the source address type only when 208 * both the source CID and destination CID indicate 209 * ATT. Anything else is an invalid combination. 210 */ 211 if (chan->scid != L2CAP_CID_ATT || 212 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT)) 213 return -EINVAL; 214 215 /* We don't have the hdev available here to make a 216 * better decision on random vs public, but since all 217 * user space versions that exhibit this issue anyway do 218 * not support random local addresses assuming public 219 * here is good enough. 220 */ 221 chan->src_type = BDADDR_LE_PUBLIC; 222 } 223 224 if (chan->src_type != BDADDR_BREDR && la.l2_bdaddr_type == BDADDR_BREDR) 225 return -EINVAL; 226 227 if (bdaddr_type_is_le(la.l2_bdaddr_type)) { 228 /* We only allow ATT user space socket */ 229 if (la.l2_cid && 230 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT)) 231 return -EINVAL; 232 } 233 234 if (chan->psm && bdaddr_type_is_le(chan->src_type)) 235 chan->mode = L2CAP_MODE_LE_FLOWCTL; 236 237 err = l2cap_chan_connect(chan, la.l2_psm, __le16_to_cpu(la.l2_cid), 238 &la.l2_bdaddr, la.l2_bdaddr_type); 239 if (err) 240 return err; 241 242 lock_sock(sk); 243 244 err = bt_sock_wait_state(sk, BT_CONNECTED, 245 sock_sndtimeo(sk, flags & O_NONBLOCK)); 246 247 release_sock(sk); 248 249 return err; 250 } 251 252 static int l2cap_sock_listen(struct socket *sock, int backlog) 253 { 254 struct sock *sk = sock->sk; 255 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 256 int err = 0; 257 258 BT_DBG("sk %p backlog %d", sk, backlog); 259 260 lock_sock(sk); 261 262 if (sk->sk_state != BT_BOUND) { 263 err = -EBADFD; 264 goto done; 265 } 266 267 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) { 268 err = -EINVAL; 269 goto done; 270 } 271 272 switch (chan->mode) { 273 case L2CAP_MODE_BASIC: 274 case L2CAP_MODE_LE_FLOWCTL: 275 break; 276 case L2CAP_MODE_ERTM: 277 case L2CAP_MODE_STREAMING: 278 if (!disable_ertm) 279 break; 280 /* fall through */ 281 default: 282 err = -ENOTSUPP; 283 goto done; 284 } 285 286 sk->sk_max_ack_backlog = backlog; 287 sk->sk_ack_backlog = 0; 288 289 chan->state = BT_LISTEN; 290 sk->sk_state = BT_LISTEN; 291 292 done: 293 release_sock(sk); 294 return err; 295 } 296 297 static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, 298 int flags) 299 { 300 DECLARE_WAITQUEUE(wait, current); 301 struct sock *sk = sock->sk, *nsk; 302 long timeo; 303 int err = 0; 304 305 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 306 307 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 308 309 BT_DBG("sk %p timeo %ld", sk, timeo); 310 311 /* Wait for an incoming connection. (wake-one). */ 312 add_wait_queue_exclusive(sk_sleep(sk), &wait); 313 while (1) { 314 set_current_state(TASK_INTERRUPTIBLE); 315 316 if (sk->sk_state != BT_LISTEN) { 317 err = -EBADFD; 318 break; 319 } 320 321 nsk = bt_accept_dequeue(sk, newsock); 322 if (nsk) 323 break; 324 325 if (!timeo) { 326 err = -EAGAIN; 327 break; 328 } 329 330 if (signal_pending(current)) { 331 err = sock_intr_errno(timeo); 332 break; 333 } 334 335 release_sock(sk); 336 timeo = schedule_timeout(timeo); 337 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 338 } 339 __set_current_state(TASK_RUNNING); 340 remove_wait_queue(sk_sleep(sk), &wait); 341 342 if (err) 343 goto done; 344 345 newsock->state = SS_CONNECTED; 346 347 BT_DBG("new socket %p", nsk); 348 349 done: 350 release_sock(sk); 351 return err; 352 } 353 354 static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, 355 int *len, int peer) 356 { 357 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; 358 struct sock *sk = sock->sk; 359 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 360 361 BT_DBG("sock %p, sk %p", sock, sk); 362 363 if (peer && sk->sk_state != BT_CONNECTED && 364 sk->sk_state != BT_CONNECT && sk->sk_state != BT_CONNECT2) 365 return -ENOTCONN; 366 367 memset(la, 0, sizeof(struct sockaddr_l2)); 368 addr->sa_family = AF_BLUETOOTH; 369 *len = sizeof(struct sockaddr_l2); 370 371 la->l2_psm = chan->psm; 372 373 if (peer) { 374 bacpy(&la->l2_bdaddr, &chan->dst); 375 la->l2_cid = cpu_to_le16(chan->dcid); 376 la->l2_bdaddr_type = chan->dst_type; 377 } else { 378 bacpy(&la->l2_bdaddr, &chan->src); 379 la->l2_cid = cpu_to_le16(chan->scid); 380 la->l2_bdaddr_type = chan->src_type; 381 } 382 383 return 0; 384 } 385 386 static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, 387 char __user *optval, int __user *optlen) 388 { 389 struct sock *sk = sock->sk; 390 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 391 struct l2cap_options opts; 392 struct l2cap_conninfo cinfo; 393 int len, err = 0; 394 u32 opt; 395 396 BT_DBG("sk %p", sk); 397 398 if (get_user(len, optlen)) 399 return -EFAULT; 400 401 lock_sock(sk); 402 403 switch (optname) { 404 case L2CAP_OPTIONS: 405 /* LE sockets should use BT_SNDMTU/BT_RCVMTU, but since 406 * legacy ATT code depends on getsockopt for 407 * L2CAP_OPTIONS we need to let this pass. 408 */ 409 if (bdaddr_type_is_le(chan->src_type) && 410 chan->scid != L2CAP_CID_ATT) { 411 err = -EINVAL; 412 break; 413 } 414 415 memset(&opts, 0, sizeof(opts)); 416 opts.imtu = chan->imtu; 417 opts.omtu = chan->omtu; 418 opts.flush_to = chan->flush_to; 419 opts.mode = chan->mode; 420 opts.fcs = chan->fcs; 421 opts.max_tx = chan->max_tx; 422 opts.txwin_size = chan->tx_win; 423 424 len = min_t(unsigned int, len, sizeof(opts)); 425 if (copy_to_user(optval, (char *) &opts, len)) 426 err = -EFAULT; 427 428 break; 429 430 case L2CAP_LM: 431 switch (chan->sec_level) { 432 case BT_SECURITY_LOW: 433 opt = L2CAP_LM_AUTH; 434 break; 435 case BT_SECURITY_MEDIUM: 436 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT; 437 break; 438 case BT_SECURITY_HIGH: 439 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT | 440 L2CAP_LM_SECURE; 441 break; 442 case BT_SECURITY_FIPS: 443 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT | 444 L2CAP_LM_SECURE | L2CAP_LM_FIPS; 445 break; 446 default: 447 opt = 0; 448 break; 449 } 450 451 if (test_bit(FLAG_ROLE_SWITCH, &chan->flags)) 452 opt |= L2CAP_LM_MASTER; 453 454 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) 455 opt |= L2CAP_LM_RELIABLE; 456 457 if (put_user(opt, (u32 __user *) optval)) 458 err = -EFAULT; 459 460 break; 461 462 case L2CAP_CONNINFO: 463 if (sk->sk_state != BT_CONNECTED && 464 !(sk->sk_state == BT_CONNECT2 && 465 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) { 466 err = -ENOTCONN; 467 break; 468 } 469 470 memset(&cinfo, 0, sizeof(cinfo)); 471 cinfo.hci_handle = chan->conn->hcon->handle; 472 memcpy(cinfo.dev_class, chan->conn->hcon->dev_class, 3); 473 474 len = min_t(unsigned int, len, sizeof(cinfo)); 475 if (copy_to_user(optval, (char *) &cinfo, len)) 476 err = -EFAULT; 477 478 break; 479 480 default: 481 err = -ENOPROTOOPT; 482 break; 483 } 484 485 release_sock(sk); 486 return err; 487 } 488 489 static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, 490 char __user *optval, int __user *optlen) 491 { 492 struct sock *sk = sock->sk; 493 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 494 struct bt_security sec; 495 struct bt_power pwr; 496 int len, err = 0; 497 498 BT_DBG("sk %p", sk); 499 500 if (level == SOL_L2CAP) 501 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen); 502 503 if (level != SOL_BLUETOOTH) 504 return -ENOPROTOOPT; 505 506 if (get_user(len, optlen)) 507 return -EFAULT; 508 509 lock_sock(sk); 510 511 switch (optname) { 512 case BT_SECURITY: 513 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED && 514 chan->chan_type != L2CAP_CHAN_FIXED && 515 chan->chan_type != L2CAP_CHAN_RAW) { 516 err = -EINVAL; 517 break; 518 } 519 520 memset(&sec, 0, sizeof(sec)); 521 if (chan->conn) { 522 sec.level = chan->conn->hcon->sec_level; 523 524 if (sk->sk_state == BT_CONNECTED) 525 sec.key_size = chan->conn->hcon->enc_key_size; 526 } else { 527 sec.level = chan->sec_level; 528 } 529 530 len = min_t(unsigned int, len, sizeof(sec)); 531 if (copy_to_user(optval, (char *) &sec, len)) 532 err = -EFAULT; 533 534 break; 535 536 case BT_DEFER_SETUP: 537 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { 538 err = -EINVAL; 539 break; 540 } 541 542 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags), 543 (u32 __user *) optval)) 544 err = -EFAULT; 545 546 break; 547 548 case BT_FLUSHABLE: 549 if (put_user(test_bit(FLAG_FLUSHABLE, &chan->flags), 550 (u32 __user *) optval)) 551 err = -EFAULT; 552 553 break; 554 555 case BT_POWER: 556 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM 557 && sk->sk_type != SOCK_RAW) { 558 err = -EINVAL; 559 break; 560 } 561 562 pwr.force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); 563 564 len = min_t(unsigned int, len, sizeof(pwr)); 565 if (copy_to_user(optval, (char *) &pwr, len)) 566 err = -EFAULT; 567 568 break; 569 570 case BT_CHANNEL_POLICY: 571 if (put_user(chan->chan_policy, (u32 __user *) optval)) 572 err = -EFAULT; 573 break; 574 575 case BT_SNDMTU: 576 if (!bdaddr_type_is_le(chan->src_type)) { 577 err = -EINVAL; 578 break; 579 } 580 581 if (sk->sk_state != BT_CONNECTED) { 582 err = -ENOTCONN; 583 break; 584 } 585 586 if (put_user(chan->omtu, (u16 __user *) optval)) 587 err = -EFAULT; 588 break; 589 590 case BT_RCVMTU: 591 if (!bdaddr_type_is_le(chan->src_type)) { 592 err = -EINVAL; 593 break; 594 } 595 596 if (put_user(chan->imtu, (u16 __user *) optval)) 597 err = -EFAULT; 598 break; 599 600 default: 601 err = -ENOPROTOOPT; 602 break; 603 } 604 605 release_sock(sk); 606 return err; 607 } 608 609 static bool l2cap_valid_mtu(struct l2cap_chan *chan, u16 mtu) 610 { 611 switch (chan->scid) { 612 case L2CAP_CID_ATT: 613 if (mtu < L2CAP_LE_MIN_MTU) 614 return false; 615 break; 616 617 default: 618 if (mtu < L2CAP_DEFAULT_MIN_MTU) 619 return false; 620 } 621 622 return true; 623 } 624 625 static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, 626 char __user *optval, unsigned int optlen) 627 { 628 struct sock *sk = sock->sk; 629 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 630 struct l2cap_options opts; 631 int len, err = 0; 632 u32 opt; 633 634 BT_DBG("sk %p", sk); 635 636 lock_sock(sk); 637 638 switch (optname) { 639 case L2CAP_OPTIONS: 640 if (bdaddr_type_is_le(chan->src_type)) { 641 err = -EINVAL; 642 break; 643 } 644 645 if (sk->sk_state == BT_CONNECTED) { 646 err = -EINVAL; 647 break; 648 } 649 650 opts.imtu = chan->imtu; 651 opts.omtu = chan->omtu; 652 opts.flush_to = chan->flush_to; 653 opts.mode = chan->mode; 654 opts.fcs = chan->fcs; 655 opts.max_tx = chan->max_tx; 656 opts.txwin_size = chan->tx_win; 657 658 len = min_t(unsigned int, sizeof(opts), optlen); 659 if (copy_from_user((char *) &opts, optval, len)) { 660 err = -EFAULT; 661 break; 662 } 663 664 if (opts.txwin_size > L2CAP_DEFAULT_EXT_WINDOW) { 665 err = -EINVAL; 666 break; 667 } 668 669 if (!l2cap_valid_mtu(chan, opts.imtu)) { 670 err = -EINVAL; 671 break; 672 } 673 674 chan->mode = opts.mode; 675 switch (chan->mode) { 676 case L2CAP_MODE_LE_FLOWCTL: 677 break; 678 case L2CAP_MODE_BASIC: 679 clear_bit(CONF_STATE2_DEVICE, &chan->conf_state); 680 break; 681 case L2CAP_MODE_ERTM: 682 case L2CAP_MODE_STREAMING: 683 if (!disable_ertm) 684 break; 685 /* fall through */ 686 default: 687 err = -EINVAL; 688 break; 689 } 690 691 chan->imtu = opts.imtu; 692 chan->omtu = opts.omtu; 693 chan->fcs = opts.fcs; 694 chan->max_tx = opts.max_tx; 695 chan->tx_win = opts.txwin_size; 696 chan->flush_to = opts.flush_to; 697 break; 698 699 case L2CAP_LM: 700 if (get_user(opt, (u32 __user *) optval)) { 701 err = -EFAULT; 702 break; 703 } 704 705 if (opt & L2CAP_LM_FIPS) { 706 err = -EINVAL; 707 break; 708 } 709 710 if (opt & L2CAP_LM_AUTH) 711 chan->sec_level = BT_SECURITY_LOW; 712 if (opt & L2CAP_LM_ENCRYPT) 713 chan->sec_level = BT_SECURITY_MEDIUM; 714 if (opt & L2CAP_LM_SECURE) 715 chan->sec_level = BT_SECURITY_HIGH; 716 717 if (opt & L2CAP_LM_MASTER) 718 set_bit(FLAG_ROLE_SWITCH, &chan->flags); 719 else 720 clear_bit(FLAG_ROLE_SWITCH, &chan->flags); 721 722 if (opt & L2CAP_LM_RELIABLE) 723 set_bit(FLAG_FORCE_RELIABLE, &chan->flags); 724 else 725 clear_bit(FLAG_FORCE_RELIABLE, &chan->flags); 726 break; 727 728 default: 729 err = -ENOPROTOOPT; 730 break; 731 } 732 733 release_sock(sk); 734 return err; 735 } 736 737 static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, 738 char __user *optval, unsigned int optlen) 739 { 740 struct sock *sk = sock->sk; 741 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 742 struct bt_security sec; 743 struct bt_power pwr; 744 struct l2cap_conn *conn; 745 int len, err = 0; 746 u32 opt; 747 748 BT_DBG("sk %p", sk); 749 750 if (level == SOL_L2CAP) 751 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen); 752 753 if (level != SOL_BLUETOOTH) 754 return -ENOPROTOOPT; 755 756 lock_sock(sk); 757 758 switch (optname) { 759 case BT_SECURITY: 760 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED && 761 chan->chan_type != L2CAP_CHAN_FIXED && 762 chan->chan_type != L2CAP_CHAN_RAW) { 763 err = -EINVAL; 764 break; 765 } 766 767 sec.level = BT_SECURITY_LOW; 768 769 len = min_t(unsigned int, sizeof(sec), optlen); 770 if (copy_from_user((char *) &sec, optval, len)) { 771 err = -EFAULT; 772 break; 773 } 774 775 if (sec.level < BT_SECURITY_LOW || 776 sec.level > BT_SECURITY_HIGH) { 777 err = -EINVAL; 778 break; 779 } 780 781 chan->sec_level = sec.level; 782 783 if (!chan->conn) 784 break; 785 786 conn = chan->conn; 787 788 /*change security for LE channels */ 789 if (chan->scid == L2CAP_CID_ATT) { 790 if (!conn->hcon->out) { 791 err = -EINVAL; 792 break; 793 } 794 795 if (smp_conn_security(conn->hcon, sec.level)) 796 break; 797 sk->sk_state = BT_CONFIG; 798 chan->state = BT_CONFIG; 799 800 /* or for ACL link */ 801 } else if ((sk->sk_state == BT_CONNECT2 && 802 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) || 803 sk->sk_state == BT_CONNECTED) { 804 if (!l2cap_chan_check_security(chan)) 805 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); 806 else 807 sk->sk_state_change(sk); 808 } else { 809 err = -EINVAL; 810 } 811 break; 812 813 case BT_DEFER_SETUP: 814 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { 815 err = -EINVAL; 816 break; 817 } 818 819 if (get_user(opt, (u32 __user *) optval)) { 820 err = -EFAULT; 821 break; 822 } 823 824 if (opt) { 825 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags); 826 set_bit(FLAG_DEFER_SETUP, &chan->flags); 827 } else { 828 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags); 829 clear_bit(FLAG_DEFER_SETUP, &chan->flags); 830 } 831 break; 832 833 case BT_FLUSHABLE: 834 if (get_user(opt, (u32 __user *) optval)) { 835 err = -EFAULT; 836 break; 837 } 838 839 if (opt > BT_FLUSHABLE_ON) { 840 err = -EINVAL; 841 break; 842 } 843 844 if (opt == BT_FLUSHABLE_OFF) { 845 conn = chan->conn; 846 /* proceed further only when we have l2cap_conn and 847 No Flush support in the LM */ 848 if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) { 849 err = -EINVAL; 850 break; 851 } 852 } 853 854 if (opt) 855 set_bit(FLAG_FLUSHABLE, &chan->flags); 856 else 857 clear_bit(FLAG_FLUSHABLE, &chan->flags); 858 break; 859 860 case BT_POWER: 861 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED && 862 chan->chan_type != L2CAP_CHAN_RAW) { 863 err = -EINVAL; 864 break; 865 } 866 867 pwr.force_active = BT_POWER_FORCE_ACTIVE_ON; 868 869 len = min_t(unsigned int, sizeof(pwr), optlen); 870 if (copy_from_user((char *) &pwr, optval, len)) { 871 err = -EFAULT; 872 break; 873 } 874 875 if (pwr.force_active) 876 set_bit(FLAG_FORCE_ACTIVE, &chan->flags); 877 else 878 clear_bit(FLAG_FORCE_ACTIVE, &chan->flags); 879 break; 880 881 case BT_CHANNEL_POLICY: 882 if (get_user(opt, (u32 __user *) optval)) { 883 err = -EFAULT; 884 break; 885 } 886 887 if (opt > BT_CHANNEL_POLICY_AMP_PREFERRED) { 888 err = -EINVAL; 889 break; 890 } 891 892 if (chan->mode != L2CAP_MODE_ERTM && 893 chan->mode != L2CAP_MODE_STREAMING) { 894 err = -EOPNOTSUPP; 895 break; 896 } 897 898 chan->chan_policy = (u8) opt; 899 900 if (sk->sk_state == BT_CONNECTED && 901 chan->move_role == L2CAP_MOVE_ROLE_NONE) 902 l2cap_move_start(chan); 903 904 break; 905 906 case BT_SNDMTU: 907 if (!bdaddr_type_is_le(chan->src_type)) { 908 err = -EINVAL; 909 break; 910 } 911 912 /* Setting is not supported as it's the remote side that 913 * decides this. 914 */ 915 err = -EPERM; 916 break; 917 918 case BT_RCVMTU: 919 if (!bdaddr_type_is_le(chan->src_type)) { 920 err = -EINVAL; 921 break; 922 } 923 924 if (sk->sk_state == BT_CONNECTED) { 925 err = -EISCONN; 926 break; 927 } 928 929 if (get_user(opt, (u32 __user *) optval)) { 930 err = -EFAULT; 931 break; 932 } 933 934 chan->imtu = opt; 935 break; 936 937 default: 938 err = -ENOPROTOOPT; 939 break; 940 } 941 942 release_sock(sk); 943 return err; 944 } 945 946 static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, 947 struct msghdr *msg, size_t len) 948 { 949 struct sock *sk = sock->sk; 950 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 951 int err; 952 953 BT_DBG("sock %p, sk %p", sock, sk); 954 955 err = sock_error(sk); 956 if (err) 957 return err; 958 959 if (msg->msg_flags & MSG_OOB) 960 return -EOPNOTSUPP; 961 962 if (sk->sk_state != BT_CONNECTED) 963 return -ENOTCONN; 964 965 lock_sock(sk); 966 err = bt_sock_wait_ready(sk, msg->msg_flags); 967 release_sock(sk); 968 if (err) 969 return err; 970 971 l2cap_chan_lock(chan); 972 err = l2cap_chan_send(chan, msg, len, sk->sk_priority); 973 l2cap_chan_unlock(chan); 974 975 return err; 976 } 977 978 static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, 979 struct msghdr *msg, size_t len, int flags) 980 { 981 struct sock *sk = sock->sk; 982 struct l2cap_pinfo *pi = l2cap_pi(sk); 983 int err; 984 985 lock_sock(sk); 986 987 if (sk->sk_state == BT_CONNECT2 && test_bit(BT_SK_DEFER_SETUP, 988 &bt_sk(sk)->flags)) { 989 if (bdaddr_type_is_le(pi->chan->src_type)) { 990 sk->sk_state = BT_CONNECTED; 991 pi->chan->state = BT_CONNECTED; 992 __l2cap_le_connect_rsp_defer(pi->chan); 993 } else { 994 sk->sk_state = BT_CONFIG; 995 pi->chan->state = BT_CONFIG; 996 __l2cap_connect_rsp_defer(pi->chan); 997 } 998 999 err = 0; 1000 goto done; 1001 } 1002 1003 release_sock(sk); 1004 1005 if (sock->type == SOCK_STREAM) 1006 err = bt_sock_stream_recvmsg(iocb, sock, msg, len, flags); 1007 else 1008 err = bt_sock_recvmsg(iocb, sock, msg, len, flags); 1009 1010 if (pi->chan->mode != L2CAP_MODE_ERTM) 1011 return err; 1012 1013 /* Attempt to put pending rx data in the socket buffer */ 1014 1015 lock_sock(sk); 1016 1017 if (!test_bit(CONN_LOCAL_BUSY, &pi->chan->conn_state)) 1018 goto done; 1019 1020 if (pi->rx_busy_skb) { 1021 if (!sock_queue_rcv_skb(sk, pi->rx_busy_skb)) 1022 pi->rx_busy_skb = NULL; 1023 else 1024 goto done; 1025 } 1026 1027 /* Restore data flow when half of the receive buffer is 1028 * available. This avoids resending large numbers of 1029 * frames. 1030 */ 1031 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf >> 1) 1032 l2cap_chan_busy(pi->chan, 0); 1033 1034 done: 1035 release_sock(sk); 1036 return err; 1037 } 1038 1039 /* Kill socket (only if zapped and orphan) 1040 * Must be called on unlocked socket. 1041 */ 1042 static void l2cap_sock_kill(struct sock *sk) 1043 { 1044 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) 1045 return; 1046 1047 BT_DBG("sk %p state %s", sk, state_to_string(sk->sk_state)); 1048 1049 /* Kill poor orphan */ 1050 1051 l2cap_chan_put(l2cap_pi(sk)->chan); 1052 sock_set_flag(sk, SOCK_DEAD); 1053 sock_put(sk); 1054 } 1055 1056 static int __l2cap_wait_ack(struct sock *sk) 1057 { 1058 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 1059 DECLARE_WAITQUEUE(wait, current); 1060 int err = 0; 1061 int timeo = HZ/5; 1062 1063 add_wait_queue(sk_sleep(sk), &wait); 1064 set_current_state(TASK_INTERRUPTIBLE); 1065 while (chan->unacked_frames > 0 && chan->conn) { 1066 if (!timeo) 1067 timeo = HZ/5; 1068 1069 if (signal_pending(current)) { 1070 err = sock_intr_errno(timeo); 1071 break; 1072 } 1073 1074 release_sock(sk); 1075 timeo = schedule_timeout(timeo); 1076 lock_sock(sk); 1077 set_current_state(TASK_INTERRUPTIBLE); 1078 1079 err = sock_error(sk); 1080 if (err) 1081 break; 1082 } 1083 set_current_state(TASK_RUNNING); 1084 remove_wait_queue(sk_sleep(sk), &wait); 1085 return err; 1086 } 1087 1088 static int l2cap_sock_shutdown(struct socket *sock, int how) 1089 { 1090 struct sock *sk = sock->sk; 1091 struct l2cap_chan *chan; 1092 struct l2cap_conn *conn; 1093 int err = 0; 1094 1095 BT_DBG("sock %p, sk %p", sock, sk); 1096 1097 if (!sk) 1098 return 0; 1099 1100 chan = l2cap_pi(sk)->chan; 1101 conn = chan->conn; 1102 1103 if (conn) 1104 mutex_lock(&conn->chan_lock); 1105 1106 l2cap_chan_lock(chan); 1107 lock_sock(sk); 1108 1109 if (!sk->sk_shutdown) { 1110 if (chan->mode == L2CAP_MODE_ERTM) 1111 err = __l2cap_wait_ack(sk); 1112 1113 sk->sk_shutdown = SHUTDOWN_MASK; 1114 1115 release_sock(sk); 1116 l2cap_chan_close(chan, 0); 1117 lock_sock(sk); 1118 1119 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) 1120 err = bt_sock_wait_state(sk, BT_CLOSED, 1121 sk->sk_lingertime); 1122 } 1123 1124 if (!err && sk->sk_err) 1125 err = -sk->sk_err; 1126 1127 release_sock(sk); 1128 l2cap_chan_unlock(chan); 1129 1130 if (conn) 1131 mutex_unlock(&conn->chan_lock); 1132 1133 return err; 1134 } 1135 1136 static int l2cap_sock_release(struct socket *sock) 1137 { 1138 struct sock *sk = sock->sk; 1139 int err; 1140 1141 BT_DBG("sock %p, sk %p", sock, sk); 1142 1143 if (!sk) 1144 return 0; 1145 1146 bt_sock_unlink(&l2cap_sk_list, sk); 1147 1148 err = l2cap_sock_shutdown(sock, 2); 1149 1150 sock_orphan(sk); 1151 l2cap_sock_kill(sk); 1152 return err; 1153 } 1154 1155 static void l2cap_sock_cleanup_listen(struct sock *parent) 1156 { 1157 struct sock *sk; 1158 1159 BT_DBG("parent %p", parent); 1160 1161 /* Close not yet accepted channels */ 1162 while ((sk = bt_accept_dequeue(parent, NULL))) { 1163 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 1164 1165 l2cap_chan_lock(chan); 1166 __clear_chan_timer(chan); 1167 l2cap_chan_close(chan, ECONNRESET); 1168 l2cap_chan_unlock(chan); 1169 1170 l2cap_sock_kill(sk); 1171 } 1172 } 1173 1174 static struct l2cap_chan *l2cap_sock_new_connection_cb(struct l2cap_chan *chan) 1175 { 1176 struct sock *sk, *parent = chan->data; 1177 1178 lock_sock(parent); 1179 1180 /* Check for backlog size */ 1181 if (sk_acceptq_is_full(parent)) { 1182 BT_DBG("backlog full %d", parent->sk_ack_backlog); 1183 release_sock(parent); 1184 return NULL; 1185 } 1186 1187 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, 1188 GFP_ATOMIC); 1189 if (!sk) { 1190 release_sock(parent); 1191 return NULL; 1192 } 1193 1194 bt_sock_reclassify_lock(sk, BTPROTO_L2CAP); 1195 1196 l2cap_sock_init(sk, parent); 1197 1198 bt_accept_enqueue(parent, sk); 1199 1200 release_sock(parent); 1201 1202 return l2cap_pi(sk)->chan; 1203 } 1204 1205 static int l2cap_sock_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) 1206 { 1207 struct sock *sk = chan->data; 1208 int err; 1209 1210 lock_sock(sk); 1211 1212 if (l2cap_pi(sk)->rx_busy_skb) { 1213 err = -ENOMEM; 1214 goto done; 1215 } 1216 1217 err = sock_queue_rcv_skb(sk, skb); 1218 1219 /* For ERTM, handle one skb that doesn't fit into the recv 1220 * buffer. This is important to do because the data frames 1221 * have already been acked, so the skb cannot be discarded. 1222 * 1223 * Notify the l2cap core that the buffer is full, so the 1224 * LOCAL_BUSY state is entered and no more frames are 1225 * acked and reassembled until there is buffer space 1226 * available. 1227 */ 1228 if (err < 0 && chan->mode == L2CAP_MODE_ERTM) { 1229 l2cap_pi(sk)->rx_busy_skb = skb; 1230 l2cap_chan_busy(chan, 1); 1231 err = 0; 1232 } 1233 1234 done: 1235 release_sock(sk); 1236 1237 return err; 1238 } 1239 1240 static void l2cap_sock_close_cb(struct l2cap_chan *chan) 1241 { 1242 struct sock *sk = chan->data; 1243 1244 l2cap_sock_kill(sk); 1245 } 1246 1247 static void l2cap_sock_teardown_cb(struct l2cap_chan *chan, int err) 1248 { 1249 struct sock *sk = chan->data; 1250 struct sock *parent; 1251 1252 lock_sock(sk); 1253 1254 parent = bt_sk(sk)->parent; 1255 1256 sock_set_flag(sk, SOCK_ZAPPED); 1257 1258 switch (chan->state) { 1259 case BT_OPEN: 1260 case BT_BOUND: 1261 case BT_CLOSED: 1262 break; 1263 case BT_LISTEN: 1264 l2cap_sock_cleanup_listen(sk); 1265 sk->sk_state = BT_CLOSED; 1266 chan->state = BT_CLOSED; 1267 1268 break; 1269 default: 1270 sk->sk_state = BT_CLOSED; 1271 chan->state = BT_CLOSED; 1272 1273 sk->sk_err = err; 1274 1275 if (parent) { 1276 bt_accept_unlink(sk); 1277 parent->sk_data_ready(parent); 1278 } else { 1279 sk->sk_state_change(sk); 1280 } 1281 1282 break; 1283 } 1284 1285 release_sock(sk); 1286 } 1287 1288 static void l2cap_sock_state_change_cb(struct l2cap_chan *chan, int state, 1289 int err) 1290 { 1291 struct sock *sk = chan->data; 1292 1293 sk->sk_state = state; 1294 1295 if (err) 1296 sk->sk_err = err; 1297 } 1298 1299 static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan, 1300 unsigned long len, int nb) 1301 { 1302 struct sock *sk = chan->data; 1303 struct sk_buff *skb; 1304 int err; 1305 1306 l2cap_chan_unlock(chan); 1307 skb = bt_skb_send_alloc(sk, len, nb, &err); 1308 l2cap_chan_lock(chan); 1309 1310 if (!skb) 1311 return ERR_PTR(err); 1312 1313 bt_cb(skb)->chan = chan; 1314 1315 return skb; 1316 } 1317 1318 static void l2cap_sock_ready_cb(struct l2cap_chan *chan) 1319 { 1320 struct sock *sk = chan->data; 1321 struct sock *parent; 1322 1323 lock_sock(sk); 1324 1325 parent = bt_sk(sk)->parent; 1326 1327 BT_DBG("sk %p, parent %p", sk, parent); 1328 1329 sk->sk_state = BT_CONNECTED; 1330 sk->sk_state_change(sk); 1331 1332 if (parent) 1333 parent->sk_data_ready(parent); 1334 1335 release_sock(sk); 1336 } 1337 1338 static void l2cap_sock_defer_cb(struct l2cap_chan *chan) 1339 { 1340 struct sock *parent, *sk = chan->data; 1341 1342 lock_sock(sk); 1343 1344 parent = bt_sk(sk)->parent; 1345 if (parent) 1346 parent->sk_data_ready(parent); 1347 1348 release_sock(sk); 1349 } 1350 1351 static void l2cap_sock_resume_cb(struct l2cap_chan *chan) 1352 { 1353 struct sock *sk = chan->data; 1354 1355 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); 1356 sk->sk_state_change(sk); 1357 } 1358 1359 static void l2cap_sock_set_shutdown_cb(struct l2cap_chan *chan) 1360 { 1361 struct sock *sk = chan->data; 1362 1363 lock_sock(sk); 1364 sk->sk_shutdown = SHUTDOWN_MASK; 1365 release_sock(sk); 1366 } 1367 1368 static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan *chan) 1369 { 1370 struct sock *sk = chan->data; 1371 1372 return sk->sk_sndtimeo; 1373 } 1374 1375 static void l2cap_sock_suspend_cb(struct l2cap_chan *chan) 1376 { 1377 struct sock *sk = chan->data; 1378 1379 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); 1380 sk->sk_state_change(sk); 1381 } 1382 1383 static struct l2cap_ops l2cap_chan_ops = { 1384 .name = "L2CAP Socket Interface", 1385 .new_connection = l2cap_sock_new_connection_cb, 1386 .recv = l2cap_sock_recv_cb, 1387 .close = l2cap_sock_close_cb, 1388 .teardown = l2cap_sock_teardown_cb, 1389 .state_change = l2cap_sock_state_change_cb, 1390 .ready = l2cap_sock_ready_cb, 1391 .defer = l2cap_sock_defer_cb, 1392 .resume = l2cap_sock_resume_cb, 1393 .suspend = l2cap_sock_suspend_cb, 1394 .set_shutdown = l2cap_sock_set_shutdown_cb, 1395 .get_sndtimeo = l2cap_sock_get_sndtimeo_cb, 1396 .alloc_skb = l2cap_sock_alloc_skb_cb, 1397 }; 1398 1399 static void l2cap_sock_destruct(struct sock *sk) 1400 { 1401 BT_DBG("sk %p", sk); 1402 1403 if (l2cap_pi(sk)->chan) 1404 l2cap_chan_put(l2cap_pi(sk)->chan); 1405 1406 if (l2cap_pi(sk)->rx_busy_skb) { 1407 kfree_skb(l2cap_pi(sk)->rx_busy_skb); 1408 l2cap_pi(sk)->rx_busy_skb = NULL; 1409 } 1410 1411 skb_queue_purge(&sk->sk_receive_queue); 1412 skb_queue_purge(&sk->sk_write_queue); 1413 } 1414 1415 static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name, 1416 int *msg_namelen) 1417 { 1418 DECLARE_SOCKADDR(struct sockaddr_l2 *, la, msg_name); 1419 1420 memset(la, 0, sizeof(struct sockaddr_l2)); 1421 la->l2_family = AF_BLUETOOTH; 1422 la->l2_psm = bt_cb(skb)->psm; 1423 bacpy(&la->l2_bdaddr, &bt_cb(skb)->bdaddr); 1424 1425 *msg_namelen = sizeof(struct sockaddr_l2); 1426 } 1427 1428 static void l2cap_sock_init(struct sock *sk, struct sock *parent) 1429 { 1430 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 1431 1432 BT_DBG("sk %p", sk); 1433 1434 if (parent) { 1435 struct l2cap_chan *pchan = l2cap_pi(parent)->chan; 1436 1437 sk->sk_type = parent->sk_type; 1438 bt_sk(sk)->flags = bt_sk(parent)->flags; 1439 1440 chan->chan_type = pchan->chan_type; 1441 chan->imtu = pchan->imtu; 1442 chan->omtu = pchan->omtu; 1443 chan->conf_state = pchan->conf_state; 1444 chan->mode = pchan->mode; 1445 chan->fcs = pchan->fcs; 1446 chan->max_tx = pchan->max_tx; 1447 chan->tx_win = pchan->tx_win; 1448 chan->tx_win_max = pchan->tx_win_max; 1449 chan->sec_level = pchan->sec_level; 1450 chan->flags = pchan->flags; 1451 chan->tx_credits = pchan->tx_credits; 1452 chan->rx_credits = pchan->rx_credits; 1453 1454 if (chan->chan_type == L2CAP_CHAN_FIXED) { 1455 chan->scid = pchan->scid; 1456 chan->dcid = pchan->scid; 1457 } 1458 1459 security_sk_clone(parent, sk); 1460 } else { 1461 switch (sk->sk_type) { 1462 case SOCK_RAW: 1463 chan->chan_type = L2CAP_CHAN_RAW; 1464 break; 1465 case SOCK_DGRAM: 1466 chan->chan_type = L2CAP_CHAN_CONN_LESS; 1467 bt_sk(sk)->skb_msg_name = l2cap_skb_msg_name; 1468 break; 1469 case SOCK_SEQPACKET: 1470 case SOCK_STREAM: 1471 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED; 1472 break; 1473 } 1474 1475 chan->imtu = L2CAP_DEFAULT_MTU; 1476 chan->omtu = 0; 1477 if (!disable_ertm && sk->sk_type == SOCK_STREAM) { 1478 chan->mode = L2CAP_MODE_ERTM; 1479 set_bit(CONF_STATE2_DEVICE, &chan->conf_state); 1480 } else { 1481 chan->mode = L2CAP_MODE_BASIC; 1482 } 1483 1484 l2cap_chan_set_defaults(chan); 1485 } 1486 1487 /* Default config options */ 1488 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO; 1489 1490 chan->data = sk; 1491 chan->ops = &l2cap_chan_ops; 1492 } 1493 1494 static struct proto l2cap_proto = { 1495 .name = "L2CAP", 1496 .owner = THIS_MODULE, 1497 .obj_size = sizeof(struct l2cap_pinfo) 1498 }; 1499 1500 static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, 1501 int proto, gfp_t prio) 1502 { 1503 struct sock *sk; 1504 struct l2cap_chan *chan; 1505 1506 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto); 1507 if (!sk) 1508 return NULL; 1509 1510 sock_init_data(sock, sk); 1511 INIT_LIST_HEAD(&bt_sk(sk)->accept_q); 1512 1513 sk->sk_destruct = l2cap_sock_destruct; 1514 sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT; 1515 1516 sock_reset_flag(sk, SOCK_ZAPPED); 1517 1518 sk->sk_protocol = proto; 1519 sk->sk_state = BT_OPEN; 1520 1521 chan = l2cap_chan_create(); 1522 if (!chan) { 1523 sk_free(sk); 1524 return NULL; 1525 } 1526 1527 l2cap_chan_hold(chan); 1528 1529 l2cap_pi(sk)->chan = chan; 1530 1531 return sk; 1532 } 1533 1534 static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol, 1535 int kern) 1536 { 1537 struct sock *sk; 1538 1539 BT_DBG("sock %p", sock); 1540 1541 sock->state = SS_UNCONNECTED; 1542 1543 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM && 1544 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) 1545 return -ESOCKTNOSUPPORT; 1546 1547 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) 1548 return -EPERM; 1549 1550 sock->ops = &l2cap_sock_ops; 1551 1552 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC); 1553 if (!sk) 1554 return -ENOMEM; 1555 1556 l2cap_sock_init(sk, NULL); 1557 bt_sock_link(&l2cap_sk_list, sk); 1558 return 0; 1559 } 1560 1561 static const struct proto_ops l2cap_sock_ops = { 1562 .family = PF_BLUETOOTH, 1563 .owner = THIS_MODULE, 1564 .release = l2cap_sock_release, 1565 .bind = l2cap_sock_bind, 1566 .connect = l2cap_sock_connect, 1567 .listen = l2cap_sock_listen, 1568 .accept = l2cap_sock_accept, 1569 .getname = l2cap_sock_getname, 1570 .sendmsg = l2cap_sock_sendmsg, 1571 .recvmsg = l2cap_sock_recvmsg, 1572 .poll = bt_sock_poll, 1573 .ioctl = bt_sock_ioctl, 1574 .mmap = sock_no_mmap, 1575 .socketpair = sock_no_socketpair, 1576 .shutdown = l2cap_sock_shutdown, 1577 .setsockopt = l2cap_sock_setsockopt, 1578 .getsockopt = l2cap_sock_getsockopt 1579 }; 1580 1581 static const struct net_proto_family l2cap_sock_family_ops = { 1582 .family = PF_BLUETOOTH, 1583 .owner = THIS_MODULE, 1584 .create = l2cap_sock_create, 1585 }; 1586 1587 int __init l2cap_init_sockets(void) 1588 { 1589 int err; 1590 1591 err = proto_register(&l2cap_proto, 0); 1592 if (err < 0) 1593 return err; 1594 1595 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops); 1596 if (err < 0) { 1597 BT_ERR("L2CAP socket registration failed"); 1598 goto error; 1599 } 1600 1601 err = bt_procfs_init(&init_net, "l2cap", &l2cap_sk_list, 1602 NULL); 1603 if (err < 0) { 1604 BT_ERR("Failed to create L2CAP proc file"); 1605 bt_sock_unregister(BTPROTO_L2CAP); 1606 goto error; 1607 } 1608 1609 BT_INFO("L2CAP socket layer initialized"); 1610 1611 return 0; 1612 1613 error: 1614 proto_unregister(&l2cap_proto); 1615 return err; 1616 } 1617 1618 void l2cap_cleanup_sockets(void) 1619 { 1620 bt_procfs_cleanup(&init_net, "l2cap"); 1621 bt_sock_unregister(BTPROTO_L2CAP); 1622 proto_unregister(&l2cap_proto); 1623 } 1624