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 return NULL; 1184 } 1185 1186 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, 1187 GFP_ATOMIC); 1188 if (!sk) 1189 return NULL; 1190 1191 bt_sock_reclassify_lock(sk, BTPROTO_L2CAP); 1192 1193 l2cap_sock_init(sk, parent); 1194 1195 bt_accept_enqueue(parent, sk); 1196 1197 release_sock(parent); 1198 1199 return l2cap_pi(sk)->chan; 1200 } 1201 1202 static int l2cap_sock_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) 1203 { 1204 struct sock *sk = chan->data; 1205 int err; 1206 1207 lock_sock(sk); 1208 1209 if (l2cap_pi(sk)->rx_busy_skb) { 1210 err = -ENOMEM; 1211 goto done; 1212 } 1213 1214 err = sock_queue_rcv_skb(sk, skb); 1215 1216 /* For ERTM, handle one skb that doesn't fit into the recv 1217 * buffer. This is important to do because the data frames 1218 * have already been acked, so the skb cannot be discarded. 1219 * 1220 * Notify the l2cap core that the buffer is full, so the 1221 * LOCAL_BUSY state is entered and no more frames are 1222 * acked and reassembled until there is buffer space 1223 * available. 1224 */ 1225 if (err < 0 && chan->mode == L2CAP_MODE_ERTM) { 1226 l2cap_pi(sk)->rx_busy_skb = skb; 1227 l2cap_chan_busy(chan, 1); 1228 err = 0; 1229 } 1230 1231 done: 1232 release_sock(sk); 1233 1234 return err; 1235 } 1236 1237 static void l2cap_sock_close_cb(struct l2cap_chan *chan) 1238 { 1239 struct sock *sk = chan->data; 1240 1241 l2cap_sock_kill(sk); 1242 } 1243 1244 static void l2cap_sock_teardown_cb(struct l2cap_chan *chan, int err) 1245 { 1246 struct sock *sk = chan->data; 1247 struct sock *parent; 1248 1249 lock_sock(sk); 1250 1251 parent = bt_sk(sk)->parent; 1252 1253 sock_set_flag(sk, SOCK_ZAPPED); 1254 1255 switch (chan->state) { 1256 case BT_OPEN: 1257 case BT_BOUND: 1258 case BT_CLOSED: 1259 break; 1260 case BT_LISTEN: 1261 l2cap_sock_cleanup_listen(sk); 1262 sk->sk_state = BT_CLOSED; 1263 chan->state = BT_CLOSED; 1264 1265 break; 1266 default: 1267 sk->sk_state = BT_CLOSED; 1268 chan->state = BT_CLOSED; 1269 1270 sk->sk_err = err; 1271 1272 if (parent) { 1273 bt_accept_unlink(sk); 1274 parent->sk_data_ready(parent); 1275 } else { 1276 sk->sk_state_change(sk); 1277 } 1278 1279 break; 1280 } 1281 1282 release_sock(sk); 1283 } 1284 1285 static void l2cap_sock_state_change_cb(struct l2cap_chan *chan, int state, 1286 int err) 1287 { 1288 struct sock *sk = chan->data; 1289 1290 sk->sk_state = state; 1291 1292 if (err) 1293 sk->sk_err = err; 1294 } 1295 1296 static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan, 1297 unsigned long len, int nb) 1298 { 1299 struct sock *sk = chan->data; 1300 struct sk_buff *skb; 1301 int err; 1302 1303 l2cap_chan_unlock(chan); 1304 skb = bt_skb_send_alloc(sk, len, nb, &err); 1305 l2cap_chan_lock(chan); 1306 1307 if (!skb) 1308 return ERR_PTR(err); 1309 1310 bt_cb(skb)->chan = chan; 1311 1312 return skb; 1313 } 1314 1315 static void l2cap_sock_ready_cb(struct l2cap_chan *chan) 1316 { 1317 struct sock *sk = chan->data; 1318 struct sock *parent; 1319 1320 lock_sock(sk); 1321 1322 parent = bt_sk(sk)->parent; 1323 1324 BT_DBG("sk %p, parent %p", sk, parent); 1325 1326 sk->sk_state = BT_CONNECTED; 1327 sk->sk_state_change(sk); 1328 1329 if (parent) 1330 parent->sk_data_ready(parent); 1331 1332 release_sock(sk); 1333 } 1334 1335 static void l2cap_sock_defer_cb(struct l2cap_chan *chan) 1336 { 1337 struct sock *parent, *sk = chan->data; 1338 1339 lock_sock(sk); 1340 1341 parent = bt_sk(sk)->parent; 1342 if (parent) 1343 parent->sk_data_ready(parent); 1344 1345 release_sock(sk); 1346 } 1347 1348 static void l2cap_sock_resume_cb(struct l2cap_chan *chan) 1349 { 1350 struct sock *sk = chan->data; 1351 1352 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); 1353 sk->sk_state_change(sk); 1354 } 1355 1356 static void l2cap_sock_set_shutdown_cb(struct l2cap_chan *chan) 1357 { 1358 struct sock *sk = chan->data; 1359 1360 lock_sock(sk); 1361 sk->sk_shutdown = SHUTDOWN_MASK; 1362 release_sock(sk); 1363 } 1364 1365 static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan *chan) 1366 { 1367 struct sock *sk = chan->data; 1368 1369 return sk->sk_sndtimeo; 1370 } 1371 1372 static void l2cap_sock_suspend_cb(struct l2cap_chan *chan) 1373 { 1374 struct sock *sk = chan->data; 1375 1376 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); 1377 sk->sk_state_change(sk); 1378 } 1379 1380 static struct l2cap_ops l2cap_chan_ops = { 1381 .name = "L2CAP Socket Interface", 1382 .new_connection = l2cap_sock_new_connection_cb, 1383 .recv = l2cap_sock_recv_cb, 1384 .close = l2cap_sock_close_cb, 1385 .teardown = l2cap_sock_teardown_cb, 1386 .state_change = l2cap_sock_state_change_cb, 1387 .ready = l2cap_sock_ready_cb, 1388 .defer = l2cap_sock_defer_cb, 1389 .resume = l2cap_sock_resume_cb, 1390 .suspend = l2cap_sock_suspend_cb, 1391 .set_shutdown = l2cap_sock_set_shutdown_cb, 1392 .get_sndtimeo = l2cap_sock_get_sndtimeo_cb, 1393 .alloc_skb = l2cap_sock_alloc_skb_cb, 1394 }; 1395 1396 static void l2cap_sock_destruct(struct sock *sk) 1397 { 1398 BT_DBG("sk %p", sk); 1399 1400 if (l2cap_pi(sk)->chan) 1401 l2cap_chan_put(l2cap_pi(sk)->chan); 1402 1403 if (l2cap_pi(sk)->rx_busy_skb) { 1404 kfree_skb(l2cap_pi(sk)->rx_busy_skb); 1405 l2cap_pi(sk)->rx_busy_skb = NULL; 1406 } 1407 1408 skb_queue_purge(&sk->sk_receive_queue); 1409 skb_queue_purge(&sk->sk_write_queue); 1410 } 1411 1412 static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name, 1413 int *msg_namelen) 1414 { 1415 DECLARE_SOCKADDR(struct sockaddr_l2 *, la, msg_name); 1416 1417 memset(la, 0, sizeof(struct sockaddr_l2)); 1418 la->l2_family = AF_BLUETOOTH; 1419 la->l2_psm = bt_cb(skb)->psm; 1420 bacpy(&la->l2_bdaddr, &bt_cb(skb)->bdaddr); 1421 1422 *msg_namelen = sizeof(struct sockaddr_l2); 1423 } 1424 1425 static void l2cap_sock_init(struct sock *sk, struct sock *parent) 1426 { 1427 struct l2cap_chan *chan = l2cap_pi(sk)->chan; 1428 1429 BT_DBG("sk %p", sk); 1430 1431 if (parent) { 1432 struct l2cap_chan *pchan = l2cap_pi(parent)->chan; 1433 1434 sk->sk_type = parent->sk_type; 1435 bt_sk(sk)->flags = bt_sk(parent)->flags; 1436 1437 chan->chan_type = pchan->chan_type; 1438 chan->imtu = pchan->imtu; 1439 chan->omtu = pchan->omtu; 1440 chan->conf_state = pchan->conf_state; 1441 chan->mode = pchan->mode; 1442 chan->fcs = pchan->fcs; 1443 chan->max_tx = pchan->max_tx; 1444 chan->tx_win = pchan->tx_win; 1445 chan->tx_win_max = pchan->tx_win_max; 1446 chan->sec_level = pchan->sec_level; 1447 chan->flags = pchan->flags; 1448 chan->tx_credits = pchan->tx_credits; 1449 chan->rx_credits = pchan->rx_credits; 1450 1451 if (chan->chan_type == L2CAP_CHAN_FIXED) { 1452 chan->scid = pchan->scid; 1453 chan->dcid = pchan->scid; 1454 } 1455 1456 security_sk_clone(parent, sk); 1457 } else { 1458 switch (sk->sk_type) { 1459 case SOCK_RAW: 1460 chan->chan_type = L2CAP_CHAN_RAW; 1461 break; 1462 case SOCK_DGRAM: 1463 chan->chan_type = L2CAP_CHAN_CONN_LESS; 1464 bt_sk(sk)->skb_msg_name = l2cap_skb_msg_name; 1465 break; 1466 case SOCK_SEQPACKET: 1467 case SOCK_STREAM: 1468 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED; 1469 break; 1470 } 1471 1472 chan->imtu = L2CAP_DEFAULT_MTU; 1473 chan->omtu = 0; 1474 if (!disable_ertm && sk->sk_type == SOCK_STREAM) { 1475 chan->mode = L2CAP_MODE_ERTM; 1476 set_bit(CONF_STATE2_DEVICE, &chan->conf_state); 1477 } else { 1478 chan->mode = L2CAP_MODE_BASIC; 1479 } 1480 1481 l2cap_chan_set_defaults(chan); 1482 } 1483 1484 /* Default config options */ 1485 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO; 1486 1487 chan->data = sk; 1488 chan->ops = &l2cap_chan_ops; 1489 } 1490 1491 static struct proto l2cap_proto = { 1492 .name = "L2CAP", 1493 .owner = THIS_MODULE, 1494 .obj_size = sizeof(struct l2cap_pinfo) 1495 }; 1496 1497 static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, 1498 int proto, gfp_t prio) 1499 { 1500 struct sock *sk; 1501 struct l2cap_chan *chan; 1502 1503 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto); 1504 if (!sk) 1505 return NULL; 1506 1507 sock_init_data(sock, sk); 1508 INIT_LIST_HEAD(&bt_sk(sk)->accept_q); 1509 1510 sk->sk_destruct = l2cap_sock_destruct; 1511 sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT; 1512 1513 sock_reset_flag(sk, SOCK_ZAPPED); 1514 1515 sk->sk_protocol = proto; 1516 sk->sk_state = BT_OPEN; 1517 1518 chan = l2cap_chan_create(); 1519 if (!chan) { 1520 sk_free(sk); 1521 return NULL; 1522 } 1523 1524 l2cap_chan_hold(chan); 1525 1526 l2cap_pi(sk)->chan = chan; 1527 1528 return sk; 1529 } 1530 1531 static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol, 1532 int kern) 1533 { 1534 struct sock *sk; 1535 1536 BT_DBG("sock %p", sock); 1537 1538 sock->state = SS_UNCONNECTED; 1539 1540 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM && 1541 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) 1542 return -ESOCKTNOSUPPORT; 1543 1544 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) 1545 return -EPERM; 1546 1547 sock->ops = &l2cap_sock_ops; 1548 1549 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC); 1550 if (!sk) 1551 return -ENOMEM; 1552 1553 l2cap_sock_init(sk, NULL); 1554 bt_sock_link(&l2cap_sk_list, sk); 1555 return 0; 1556 } 1557 1558 static const struct proto_ops l2cap_sock_ops = { 1559 .family = PF_BLUETOOTH, 1560 .owner = THIS_MODULE, 1561 .release = l2cap_sock_release, 1562 .bind = l2cap_sock_bind, 1563 .connect = l2cap_sock_connect, 1564 .listen = l2cap_sock_listen, 1565 .accept = l2cap_sock_accept, 1566 .getname = l2cap_sock_getname, 1567 .sendmsg = l2cap_sock_sendmsg, 1568 .recvmsg = l2cap_sock_recvmsg, 1569 .poll = bt_sock_poll, 1570 .ioctl = bt_sock_ioctl, 1571 .mmap = sock_no_mmap, 1572 .socketpair = sock_no_socketpair, 1573 .shutdown = l2cap_sock_shutdown, 1574 .setsockopt = l2cap_sock_setsockopt, 1575 .getsockopt = l2cap_sock_getsockopt 1576 }; 1577 1578 static const struct net_proto_family l2cap_sock_family_ops = { 1579 .family = PF_BLUETOOTH, 1580 .owner = THIS_MODULE, 1581 .create = l2cap_sock_create, 1582 }; 1583 1584 int __init l2cap_init_sockets(void) 1585 { 1586 int err; 1587 1588 err = proto_register(&l2cap_proto, 0); 1589 if (err < 0) 1590 return err; 1591 1592 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops); 1593 if (err < 0) { 1594 BT_ERR("L2CAP socket registration failed"); 1595 goto error; 1596 } 1597 1598 err = bt_procfs_init(&init_net, "l2cap", &l2cap_sk_list, 1599 NULL); 1600 if (err < 0) { 1601 BT_ERR("Failed to create L2CAP proc file"); 1602 bt_sock_unregister(BTPROTO_L2CAP); 1603 goto error; 1604 } 1605 1606 BT_INFO("L2CAP socket layer initialized"); 1607 1608 return 0; 1609 1610 error: 1611 proto_unregister(&l2cap_proto); 1612 return err; 1613 } 1614 1615 void l2cap_cleanup_sockets(void) 1616 { 1617 bt_procfs_cleanup(&init_net, "l2cap"); 1618 bt_sock_unregister(BTPROTO_L2CAP); 1619 proto_unregister(&l2cap_proto); 1620 } 1621