1 /* $NetBSD: hci_link.c,v 1.27 2024/07/05 04:31:53 rin Exp $ */ 2 3 /*- 4 * Copyright (c) 2005 Iain Hibbert. 5 * Copyright (c) 2006 Itronix Inc. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of Itronix Inc. may not be used to endorse 17 * or promote products derived from this software without specific 18 * prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY 24 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 25 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 27 * ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: hci_link.c,v 1.27 2024/07/05 04:31:53 rin Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/kernel.h> 38 #include <sys/malloc.h> 39 #include <sys/mbuf.h> 40 #include <sys/proc.h> 41 #include <sys/queue.h> 42 #include <sys/systm.h> 43 44 #include <netbt/bluetooth.h> 45 #include <netbt/hci.h> 46 #include <netbt/l2cap.h> 47 #include <netbt/sco.h> 48 49 /******************************************************************************* 50 * 51 * HCI ACL Connections 52 */ 53 54 /* 55 * Automatically expire unused ACL connections after this number of 56 * seconds (if zero, do not expire unused connections) [sysctl] 57 */ 58 int hci_acl_expiry = 10; /* seconds */ 59 60 /* 61 * hci_acl_open(unit, bdaddr) 62 * 63 * open ACL connection to remote bdaddr. Only one ACL connection is permitted 64 * between any two Bluetooth devices, so we look for an existing one before 65 * trying to start a new one. 66 */ 67 struct hci_link * 68 hci_acl_open(struct hci_unit *unit, bdaddr_t *bdaddr) 69 { 70 struct hci_link *link; 71 struct hci_memo *memo; 72 hci_create_con_cp cp; 73 int err; 74 75 KASSERT(unit != NULL); 76 KASSERT(bdaddr != NULL); 77 78 link = hci_link_lookup_bdaddr(unit, bdaddr, HCI_LINK_ACL); 79 if (link == NULL) { 80 link = hci_link_alloc(unit, bdaddr, HCI_LINK_ACL); 81 if (link == NULL) 82 return NULL; 83 } 84 85 switch(link->hl_state) { 86 case HCI_LINK_CLOSED: 87 /* 88 * open connection to remote device 89 */ 90 memset(&cp, 0, sizeof(cp)); 91 bdaddr_copy(&cp.bdaddr, bdaddr); 92 cp.pkt_type = htole16(unit->hci_packet_type); 93 94 memo = hci_memo_find(unit, bdaddr); 95 if (memo != NULL) { 96 cp.page_scan_rep_mode = memo->page_scan_rep_mode; 97 cp.page_scan_mode = memo->page_scan_mode; 98 cp.clock_offset = memo->clock_offset; 99 } 100 101 if (unit->hci_link_policy & HCI_LINK_POLICY_ENABLE_ROLE_SWITCH) 102 cp.accept_role_switch = 1; 103 104 err = hci_send_cmd(unit, HCI_CMD_CREATE_CON, &cp, sizeof(cp)); 105 if (err) { 106 hci_link_free(link, err); 107 return NULL; 108 } 109 110 link->hl_flags |= HCI_LINK_CREATE_CON; 111 link->hl_state = HCI_LINK_WAIT_CONNECT; 112 break; 113 114 case HCI_LINK_WAIT_CONNECT: 115 case HCI_LINK_WAIT_AUTH: 116 case HCI_LINK_WAIT_ENCRYPT: 117 case HCI_LINK_WAIT_SECURE: 118 /* 119 * somebody else already trying to connect, we just 120 * sit on the bench with them.. 121 */ 122 break; 123 124 case HCI_LINK_OPEN: 125 /* 126 * If already open, halt any expiry timeouts. We don't need 127 * to care about already invoking timeouts since refcnt >0 128 * will keep the link alive. 129 */ 130 callout_stop(&link->hl_expire); 131 break; 132 133 default: 134 UNKNOWN(link->hl_state); 135 return NULL; 136 } 137 138 /* open */ 139 link->hl_refcnt++; 140 141 return link; 142 } 143 144 /* 145 * Close ACL connection. When there are no more references to this link, 146 * we can either close it down or schedule a delayed closedown. 147 */ 148 void 149 hci_acl_close(struct hci_link *link, int err) 150 { 151 152 KASSERT(link != NULL); 153 154 if (--link->hl_refcnt == 0) { 155 if (link->hl_state == HCI_LINK_CLOSED) 156 hci_link_free(link, err); 157 else if (hci_acl_expiry > 0) 158 callout_schedule(&link->hl_expire, hci_acl_expiry * hz); 159 } 160 } 161 162 /* 163 * Incoming ACL connection. 164 * 165 * Check the L2CAP listeners list and only accept when there is a 166 * potential listener available. 167 * 168 * There should not be a link to the same bdaddr already, we check 169 * anyway though its left unhandled for now. 170 */ 171 struct hci_link * 172 hci_acl_newconn(struct hci_unit *unit, bdaddr_t *bdaddr) 173 { 174 struct hci_link *link; 175 struct l2cap_channel *chan; 176 177 LIST_FOREACH(chan, &l2cap_listen_list, lc_ncid) { 178 if (bdaddr_same(&unit->hci_bdaddr, &chan->lc_laddr.bt_bdaddr) 179 || bdaddr_any(&chan->lc_laddr.bt_bdaddr)) 180 break; 181 } 182 183 if (chan == NULL) { 184 DPRINTF("%s: rejecting connection (no listeners)\n", 185 device_xname(unit->hci_dev)); 186 187 return NULL; 188 } 189 190 link = hci_link_lookup_bdaddr(unit, bdaddr, HCI_LINK_ACL); 191 if (link != NULL) { 192 DPRINTF("%s: rejecting connection (link exists)\n", 193 device_xname(unit->hci_dev)); 194 195 return NULL; 196 } 197 198 link = hci_link_alloc(unit, bdaddr, HCI_LINK_ACL); 199 if (link != NULL) { 200 link->hl_state = HCI_LINK_WAIT_CONNECT; 201 202 if (hci_acl_expiry > 0) 203 callout_schedule(&link->hl_expire, hci_acl_expiry * hz); 204 } 205 206 return link; 207 } 208 209 void 210 hci_acl_timeout(void *arg) 211 { 212 struct hci_link *link = arg; 213 hci_discon_cp cp; 214 int err; 215 216 mutex_enter(bt_lock); 217 callout_ack(&link->hl_expire); 218 219 if (link->hl_refcnt > 0) 220 goto out; 221 222 DPRINTF("link #%d expired\n", link->hl_handle); 223 224 switch (link->hl_state) { 225 case HCI_LINK_CLOSED: 226 case HCI_LINK_WAIT_CONNECT: 227 hci_link_free(link, ECONNRESET); 228 break; 229 230 case HCI_LINK_WAIT_AUTH: 231 case HCI_LINK_WAIT_ENCRYPT: 232 case HCI_LINK_WAIT_SECURE: 233 case HCI_LINK_OPEN: 234 cp.con_handle = htole16(link->hl_handle); 235 cp.reason = 0x13; /* "Remote User Terminated Connection" */ 236 237 err = hci_send_cmd(link->hl_unit, HCI_CMD_DISCONNECT, 238 &cp, sizeof(cp)); 239 240 if (err) { 241 DPRINTF("error %d sending HCI_CMD_DISCONNECT\n", 242 err); 243 } 244 245 break; 246 247 default: 248 UNKNOWN(link->hl_state); 249 break; 250 } 251 252 out: 253 mutex_exit(bt_lock); 254 } 255 256 /* 257 * Initiate any Link Mode change requests. 258 */ 259 int 260 hci_acl_setmode(struct hci_link *link) 261 { 262 int err; 263 264 KASSERT(link != NULL); 265 KASSERT(link->hl_unit != NULL); 266 267 if (link->hl_state != HCI_LINK_OPEN) 268 return EINPROGRESS; 269 270 if ((link->hl_flags & HCI_LINK_AUTH_REQ) 271 && !(link->hl_flags & HCI_LINK_AUTH)) { 272 hci_auth_req_cp cp; 273 274 DPRINTF("requesting auth for handle #%d\n", 275 link->hl_handle); 276 277 link->hl_state = HCI_LINK_WAIT_AUTH; 278 cp.con_handle = htole16(link->hl_handle); 279 err = hci_send_cmd(link->hl_unit, HCI_CMD_AUTH_REQ, 280 &cp, sizeof(cp)); 281 282 return (err == 0 ? EINPROGRESS : err); 283 } 284 285 if ((link->hl_flags & HCI_LINK_ENCRYPT_REQ) 286 && !(link->hl_flags & HCI_LINK_ENCRYPT)) { 287 hci_set_con_encryption_cp cp; 288 289 /* XXX we should check features for encryption capability */ 290 291 DPRINTF("requesting encryption for handle #%d\n", 292 link->hl_handle); 293 294 link->hl_state = HCI_LINK_WAIT_ENCRYPT; 295 cp.con_handle = htole16(link->hl_handle); 296 cp.encryption_enable = 0x01; 297 298 err = hci_send_cmd(link->hl_unit, HCI_CMD_SET_CON_ENCRYPTION, 299 &cp, sizeof(cp)); 300 301 return (err == 0 ? EINPROGRESS : err); 302 } 303 304 if ((link->hl_flags & HCI_LINK_SECURE_REQ)) { 305 hci_change_con_link_key_cp cp; 306 307 /* always change link key for SECURE requests */ 308 link->hl_flags &= ~HCI_LINK_SECURE; 309 310 DPRINTF("changing link key for handle #%d\n", 311 link->hl_handle); 312 313 link->hl_state = HCI_LINK_WAIT_SECURE; 314 cp.con_handle = htole16(link->hl_handle); 315 316 err = hci_send_cmd(link->hl_unit, HCI_CMD_CHANGE_CON_LINK_KEY, 317 &cp, sizeof(cp)); 318 319 return (err == 0 ? EINPROGRESS : err); 320 } 321 322 return 0; 323 } 324 325 /* 326 * Link Mode changed. 327 * 328 * This is called from event handlers when the mode change 329 * is complete. We notify upstream and restart the link. 330 */ 331 void 332 hci_acl_linkmode(struct hci_link *link) 333 { 334 struct l2cap_channel *chan, *next; 335 int err, mode = 0; 336 337 DPRINTF("handle #%d, auth %s, encrypt %s, secure %s\n", 338 link->hl_handle, 339 (link->hl_flags & HCI_LINK_AUTH ? "on" : "off"), 340 (link->hl_flags & HCI_LINK_ENCRYPT ? "on" : "off"), 341 (link->hl_flags & HCI_LINK_SECURE ? "on" : "off")); 342 343 if (link->hl_flags & HCI_LINK_AUTH) 344 mode |= L2CAP_LM_AUTH; 345 346 if (link->hl_flags & HCI_LINK_ENCRYPT) 347 mode |= L2CAP_LM_ENCRYPT; 348 349 if (link->hl_flags & HCI_LINK_SECURE) 350 mode |= L2CAP_LM_SECURE; 351 352 /* 353 * The link state will only be OPEN here if the mode change 354 * was successful. So, we can proceed with L2CAP connections, 355 * or notify already established channels, to allow any that 356 * are dissatisfied to disconnect before we restart. 357 */ 358 next = LIST_FIRST(&l2cap_active_list); 359 while ((chan = next) != NULL) { 360 next = LIST_NEXT(chan, lc_ncid); 361 362 if (chan->lc_link != link) 363 continue; 364 365 switch(chan->lc_state) { 366 case L2CAP_WAIT_SEND_CONNECT_REQ: /* we are connecting */ 367 if ((mode & chan->lc_mode) != chan->lc_mode) { 368 l2cap_close(chan, ECONNABORTED); 369 break; 370 } 371 372 chan->lc_state = L2CAP_WAIT_RECV_CONNECT_RSP; 373 err = l2cap_send_connect_req(chan); 374 if (err) { 375 l2cap_close(chan, err); 376 break; 377 } 378 break; 379 380 case L2CAP_WAIT_SEND_CONNECT_RSP: /* they are connecting */ 381 if ((mode & chan->lc_mode) != chan->lc_mode) { 382 l2cap_send_connect_rsp(link, chan->lc_ident, 383 0, chan->lc_rcid, 384 L2CAP_SECURITY_BLOCK); 385 386 l2cap_close(chan, ECONNABORTED); 387 break; 388 } 389 390 l2cap_send_connect_rsp(link, chan->lc_ident, 391 chan->lc_lcid, chan->lc_rcid, 392 L2CAP_SUCCESS); 393 394 chan->lc_state = L2CAP_WAIT_CONFIG; 395 chan->lc_flags |= (L2CAP_WAIT_CONFIG_RSP | L2CAP_WAIT_CONFIG_REQ); 396 err = l2cap_send_config_req(chan); 397 if (err) { 398 l2cap_close(chan, err); 399 break; 400 } 401 break; 402 403 case L2CAP_WAIT_RECV_CONNECT_RSP: 404 case L2CAP_WAIT_CONFIG: 405 case L2CAP_OPEN: /* already established */ 406 (*chan->lc_proto->linkmode)(chan->lc_upper, mode); 407 break; 408 409 default: 410 break; 411 } 412 } 413 414 link->hl_state = HCI_LINK_OPEN; 415 hci_acl_start(link); 416 } 417 418 /* 419 * Receive ACL Data 420 * 421 * we accumulate packet fragments on the hci_link structure 422 * until a full L2CAP frame is ready, then send it on. 423 */ 424 void 425 hci_acl_recv(struct mbuf *m, struct hci_unit *unit) 426 { 427 struct hci_link *link; 428 hci_acldata_hdr_t hdr; 429 uint16_t handle, want; 430 int pb, got; 431 432 KASSERT(m != NULL); 433 KASSERT(unit != NULL); 434 435 if (m->m_pkthdr.len < sizeof(hdr)) 436 goto bad; 437 438 m_copydata(m, 0, sizeof(hdr), &hdr); 439 m_adj(m, sizeof(hdr)); 440 441 KASSERT(hdr.type == HCI_ACL_DATA_PKT); 442 443 hdr.length = le16toh(hdr.length); 444 hdr.con_handle = le16toh(hdr.con_handle); 445 handle = HCI_CON_HANDLE(hdr.con_handle); 446 pb = HCI_PB_FLAG(hdr.con_handle); 447 448 if (m->m_pkthdr.len != hdr.length) 449 goto bad; 450 451 link = hci_link_lookup_handle(unit, handle); 452 if (link == NULL) { 453 hci_discon_cp cp; 454 455 DPRINTF("%s: dumping packet for unknown handle #%d\n", 456 device_xname(unit->hci_dev), handle); 457 458 /* 459 * There is no way to find out what this connection handle is 460 * for, just get rid of it. This may happen, if a USB dongle 461 * is plugged into a self powered hub and does not reset when 462 * the system is shut down. 463 * 464 * This can cause a problem with some Broadcom controllers 465 * which emit empty ACL packets during connection setup, so 466 * only disconnect where data is present. 467 */ 468 if (hdr.length > 0) { 469 cp.con_handle = htole16(handle); 470 cp.reason = 0x13;/*"Remote User Terminated Connection"*/ 471 hci_send_cmd(unit, HCI_CMD_DISCONNECT, &cp, sizeof(cp)); 472 } 473 goto bad; 474 } 475 476 switch (pb) { 477 case HCI_PACKET_START: 478 if (m->m_pkthdr.len < sizeof(l2cap_hdr_t)) 479 goto bad; 480 481 if (link->hl_rxp != NULL) { 482 aprint_error_dev(unit->hci_dev, 483 "dropped incomplete ACL packet\n"); 484 485 m_freem(link->hl_rxp); 486 } 487 488 link->hl_rxp = m; 489 got = m->m_pkthdr.len; 490 break; 491 492 case HCI_PACKET_FRAGMENT: 493 if (link->hl_rxp == NULL) { 494 aprint_error_dev(unit->hci_dev, 495 "unexpected packet fragment\n"); 496 497 goto bad; 498 } 499 500 got = m->m_pkthdr.len + link->hl_rxp->m_pkthdr.len; 501 m_cat(link->hl_rxp, m); 502 m = link->hl_rxp; 503 m->m_pkthdr.len = got; 504 break; 505 506 default: 507 DPRINTF("%s: unknown packet type\n", 508 device_xname(unit->hci_dev)); 509 510 goto bad; 511 } 512 513 m_copydata(m, 0, sizeof(want), &want); 514 want = le16toh(want); 515 got -= sizeof(l2cap_hdr_t); 516 517 if (got < want) /* wait for more */ 518 return; 519 520 link->hl_rxp = NULL; 521 522 if (got > want) { 523 DPRINTF("%s: packet overflow\n", 524 device_xname(unit->hci_dev)); 525 526 goto bad; 527 } 528 529 l2cap_recv_frame(m, link); 530 return; 531 532 bad: 533 m_freem(m); 534 } 535 536 /* 537 * Send ACL data on link 538 * 539 * We must fragment packets into chunks of less than unit->hci_max_acl_size and 540 * prepend a relevant ACL header to each fragment. We keep a PDU structure 541 * attached to the link, so that completed fragments can be marked off and 542 * more data requested from above once the PDU is sent. 543 */ 544 int 545 hci_acl_send(struct mbuf *m, struct hci_link *link, 546 struct l2cap_channel *chan) 547 { 548 struct l2cap_pdu *pdu; 549 struct mbuf *n = NULL; 550 int plen, mlen, num = 0; 551 552 KASSERT(link != NULL); 553 KASSERT(m != NULL); 554 KASSERT(m->m_flags & M_PKTHDR); 555 KASSERT(m->m_pkthdr.len > 0); 556 557 if (link->hl_state == HCI_LINK_CLOSED) { 558 m_freem(m); 559 return ENETDOWN; 560 } 561 562 pdu = pool_get(&l2cap_pdu_pool, PR_NOWAIT); 563 if (pdu == NULL) 564 goto nomem; 565 566 pdu->lp_chan = chan; 567 pdu->lp_pending = 0; 568 MBUFQ_INIT(&pdu->lp_data); 569 570 plen = m->m_pkthdr.len; 571 mlen = link->hl_unit->hci_max_acl_size; 572 573 DPRINTFN(5, "%s: handle #%d, plen = %d, max = %d\n", 574 device_xname(link->hl_unit->hci_dev), link->hl_handle, plen, mlen); 575 576 while (plen > 0) { 577 if (plen > mlen) { 578 n = m_split(m, mlen, M_DONTWAIT); 579 if (n == NULL) 580 goto nomem; 581 } else { 582 mlen = plen; 583 } 584 585 if (num++ == 0) 586 m->m_flags |= M_PROTO1; /* tag first fragment */ 587 588 DPRINTFN(10, "chunk of %d (plen = %d) bytes\n", mlen, plen); 589 MBUFQ_ENQUEUE(&pdu->lp_data, m); 590 m = n; 591 plen -= mlen; 592 } 593 594 TAILQ_INSERT_TAIL(&link->hl_txq, pdu, lp_next); 595 link->hl_txqlen += num; 596 597 hci_acl_start(link); 598 599 return 0; 600 601 nomem: 602 m_freem(m); 603 if (pdu) { 604 MBUFQ_DRAIN(&pdu->lp_data); 605 pool_put(&l2cap_pdu_pool, pdu); 606 } 607 608 return ENOMEM; 609 } 610 611 /* 612 * Start sending ACL data on link. 613 * 614 * This is called when the queue may need restarting: as new data 615 * is queued, after link mode changes have completed, or when device 616 * buffers have cleared. 617 * 618 * We may use all the available packet slots. The reason that we add 619 * the ACL encapsulation here rather than in hci_acl_send() is that L2CAP 620 * signal packets may be queued before the handle is given to us.. 621 */ 622 void 623 hci_acl_start(struct hci_link *link) 624 { 625 struct hci_unit *unit; 626 hci_acldata_hdr_t *hdr; 627 struct l2cap_pdu *pdu; 628 struct mbuf *m; 629 uint16_t handle; 630 631 KASSERT(link != NULL); 632 633 unit = link->hl_unit; 634 KASSERT(unit != NULL); 635 636 /* this is mainly to block ourselves (below) */ 637 if (link->hl_state != HCI_LINK_OPEN) 638 return; 639 640 if (link->hl_txqlen == 0 || unit->hci_num_acl_pkts == 0) 641 return; 642 643 /* find first PDU with data to send */ 644 pdu = TAILQ_FIRST(&link->hl_txq); 645 for (;;) { 646 if (pdu == NULL) 647 return; 648 649 if (MBUFQ_FIRST(&pdu->lp_data) != NULL) 650 break; 651 652 pdu = TAILQ_NEXT(pdu, lp_next); 653 } 654 655 while (unit->hci_num_acl_pkts > 0) { 656 MBUFQ_DEQUEUE(&pdu->lp_data, m); 657 KASSERT(m != NULL); 658 659 if (m->m_flags & M_PROTO1) 660 handle = HCI_MK_CON_HANDLE(link->hl_handle, 661 HCI_PACKET_START, 0); 662 else 663 handle = HCI_MK_CON_HANDLE(link->hl_handle, 664 HCI_PACKET_FRAGMENT, 0); 665 666 M_PREPEND(m, sizeof(*hdr), M_DONTWAIT); 667 if (m == NULL) 668 break; 669 670 hdr = mtod(m, hci_acldata_hdr_t *); 671 hdr->type = HCI_ACL_DATA_PKT; 672 hdr->con_handle = htole16(handle); 673 hdr->length = htole16(m->m_pkthdr.len - sizeof(*hdr)); 674 675 link->hl_txqlen--; 676 pdu->lp_pending++; 677 678 hci_output_acl(unit, m); 679 680 if (MBUFQ_FIRST(&pdu->lp_data) == NULL) { 681 if (pdu->lp_chan) { 682 /* 683 * This should enable streaming of PDUs - when 684 * we have placed all the fragments on the acl 685 * output queue, we trigger the L2CAP layer to 686 * send us down one more. Use a false state so 687 * we dont run into ourselves coming back from 688 * the future.. 689 */ 690 link->hl_state = HCI_LINK_BLOCK; 691 l2cap_start(pdu->lp_chan); 692 link->hl_state = HCI_LINK_OPEN; 693 } 694 695 pdu = TAILQ_NEXT(pdu, lp_next); 696 if (pdu == NULL) 697 break; 698 } 699 } 700 701 /* 702 * We had our turn now, move to the back of the queue to let 703 * other links have a go at the output buffers.. 704 */ 705 if (TAILQ_NEXT(link, hl_next)) { 706 TAILQ_REMOVE(&unit->hci_links, link, hl_next); 707 TAILQ_INSERT_TAIL(&unit->hci_links, link, hl_next); 708 } 709 } 710 711 /* 712 * Confirm ACL packets cleared from Controller buffers. We scan our PDU 713 * list to clear pending fragments and signal upstream for more data 714 * when a PDU is complete. 715 */ 716 void 717 hci_acl_complete(struct hci_link *link, int num) 718 { 719 struct l2cap_pdu *pdu; 720 struct l2cap_channel *chan; 721 722 DPRINTFN(5, "handle #%d (%d)\n", link->hl_handle, num); 723 724 while (num > 0) { 725 pdu = TAILQ_FIRST(&link->hl_txq); 726 if (pdu == NULL) { 727 aprint_error_dev(link->hl_unit->hci_dev, 728 "%d packets completed on handle #%x but none pending!\n", 729 num, link->hl_handle); 730 731 return; 732 } 733 734 if (num >= pdu->lp_pending) { 735 num -= pdu->lp_pending; 736 pdu->lp_pending = 0; 737 738 if (MBUFQ_FIRST(&pdu->lp_data) == NULL) { 739 TAILQ_REMOVE(&link->hl_txq, pdu, lp_next); 740 chan = pdu->lp_chan; 741 if (chan != NULL) { 742 chan->lc_pending--; 743 (*chan->lc_proto->complete) 744 (chan->lc_upper, 1); 745 746 if (chan->lc_pending == 0) 747 l2cap_start(chan); 748 } 749 750 pool_put(&l2cap_pdu_pool, pdu); 751 } 752 } else { 753 pdu->lp_pending -= num; 754 num = 0; 755 } 756 } 757 } 758 759 /******************************************************************************* 760 * 761 * HCI SCO Connections 762 */ 763 764 /* 765 * Incoming SCO Connection. We check the list for anybody willing 766 * to take it. 767 */ 768 struct hci_link * 769 hci_sco_newconn(struct hci_unit *unit, bdaddr_t *bdaddr) 770 { 771 struct sockaddr_bt laddr, raddr; 772 struct sco_pcb *pcb, *new; 773 struct hci_link *sco, *acl; 774 775 memset(&laddr, 0, sizeof(laddr)); 776 laddr.bt_len = sizeof(laddr); 777 laddr.bt_family = AF_BLUETOOTH; 778 bdaddr_copy(&laddr.bt_bdaddr, &unit->hci_bdaddr); 779 780 memset(&raddr, 0, sizeof(raddr)); 781 raddr.bt_len = sizeof(raddr); 782 raddr.bt_family = AF_BLUETOOTH; 783 bdaddr_copy(&raddr.bt_bdaddr, bdaddr); 784 785 /* 786 * There should already be an ACL link up and running before 787 * the controller sends us SCO connection requests, but you 788 * never know.. 789 */ 790 acl = hci_link_lookup_bdaddr(unit, bdaddr, HCI_LINK_ACL); 791 if (acl == NULL || acl->hl_state != HCI_LINK_OPEN) 792 return NULL; 793 794 LIST_FOREACH(pcb, &sco_pcb, sp_next) { 795 if ((pcb->sp_flags & SP_LISTENING) == 0) 796 continue; 797 798 new = (*pcb->sp_proto->newconn)(pcb->sp_upper, &laddr, &raddr); 799 if (new == NULL) 800 continue; 801 802 /* 803 * Ok, got new pcb so we can start a new link and fill 804 * in all the details. 805 */ 806 bdaddr_copy(&new->sp_laddr, &unit->hci_bdaddr); 807 bdaddr_copy(&new->sp_raddr, bdaddr); 808 809 sco = hci_link_alloc(unit, bdaddr, HCI_LINK_SCO); 810 if (sco == NULL) { 811 sco_detach_pcb(&new); 812 return NULL; 813 } 814 815 sco->hl_link = hci_acl_open(unit, bdaddr); 816 KASSERT(sco->hl_link == acl); 817 818 sco->hl_sco = new; 819 new->sp_link = sco; 820 821 new->sp_mtu = unit->hci_max_sco_size; 822 return sco; 823 } 824 825 return NULL; 826 } 827 828 /* 829 * receive SCO packet, we only need to strip the header and send 830 * it to the right handler 831 */ 832 void 833 hci_sco_recv(struct mbuf *m, struct hci_unit *unit) 834 { 835 struct hci_link *link; 836 hci_scodata_hdr_t hdr; 837 uint16_t handle; 838 839 KASSERT(m != NULL); 840 KASSERT(unit != NULL); 841 842 if (m->m_pkthdr.len < sizeof(hdr)) 843 goto bad; 844 845 m_copydata(m, 0, sizeof(hdr), &hdr); 846 m_adj(m, sizeof(hdr)); 847 848 KASSERT(hdr.type == HCI_SCO_DATA_PKT); 849 850 hdr.con_handle = le16toh(hdr.con_handle); 851 handle = HCI_CON_HANDLE(hdr.con_handle); 852 853 if (m->m_pkthdr.len != hdr.length) 854 goto bad; 855 856 link = hci_link_lookup_handle(unit, handle); 857 if (link == NULL || link->hl_type == HCI_LINK_ACL) { 858 DPRINTF("%s: dumping packet for unknown handle #%d\n", 859 device_xname(unit->hci_dev), handle); 860 861 goto bad; 862 } 863 864 (*link->hl_sco->sp_proto->input)(link->hl_sco->sp_upper, m); 865 return; 866 867 bad: 868 m_freem(m); 869 } 870 871 void 872 hci_sco_start(struct hci_link *link) 873 { 874 } 875 876 /* 877 * SCO packets have completed at the controller, so we can 878 * signal up to free the buffer space. 879 */ 880 void 881 hci_sco_complete(struct hci_link *link, int num) 882 { 883 884 DPRINTFN(5, "handle #%d (num=%d)\n", link->hl_handle, num); 885 link->hl_sco->sp_pending--; 886 (*link->hl_sco->sp_proto->complete)(link->hl_sco->sp_upper, num); 887 } 888 889 /******************************************************************************* 890 * 891 * Generic HCI Connection alloc/free/lookup etc 892 */ 893 894 struct hci_link * 895 hci_link_alloc(struct hci_unit *unit, bdaddr_t *bdaddr, uint8_t type) 896 { 897 struct hci_link *link; 898 899 KASSERT(unit != NULL); 900 901 link = malloc(sizeof(struct hci_link), M_BLUETOOTH, M_NOWAIT | M_ZERO); 902 if (link == NULL) 903 return NULL; 904 905 link->hl_unit = unit; 906 link->hl_type = type; 907 link->hl_state = HCI_LINK_CLOSED; 908 bdaddr_copy(&link->hl_bdaddr, bdaddr); 909 910 /* init ACL portion */ 911 callout_init(&link->hl_expire, 0); 912 callout_setfunc(&link->hl_expire, hci_acl_timeout, link); 913 914 TAILQ_INIT(&link->hl_txq); /* outgoing packets */ 915 TAILQ_INIT(&link->hl_reqs); /* request queue */ 916 917 link->hl_mtu = L2CAP_MTU_DEFAULT; /* L2CAP signal mtu */ 918 link->hl_flush = L2CAP_FLUSH_TIMO_DEFAULT; /* flush timeout */ 919 920 /* init SCO portion */ 921 MBUFQ_INIT(&link->hl_data); 922 923 /* attach to unit */ 924 TAILQ_INSERT_TAIL(&unit->hci_links, link, hl_next); 925 return link; 926 } 927 928 void 929 hci_link_free(struct hci_link *link, int err) 930 { 931 struct l2cap_req *req; 932 struct l2cap_pdu *pdu; 933 struct l2cap_channel *chan, *next; 934 935 KASSERT(link != NULL); 936 937 DPRINTF("#%d, type = %d, state = %d, refcnt = %d\n", 938 link->hl_handle, link->hl_type, 939 link->hl_state, link->hl_refcnt); 940 941 /* ACL reference count */ 942 if (link->hl_refcnt > 0) { 943 next = LIST_FIRST(&l2cap_active_list); 944 while ((chan = next) != NULL) { 945 next = LIST_NEXT(chan, lc_ncid); 946 if (chan->lc_link == link) 947 l2cap_close(chan, err); 948 } 949 } 950 KASSERT(link->hl_refcnt == 0); 951 952 /* ACL L2CAP requests.. */ 953 while ((req = TAILQ_FIRST(&link->hl_reqs)) != NULL) 954 l2cap_request_free(req); 955 956 KASSERT(TAILQ_EMPTY(&link->hl_reqs)); 957 958 /* ACL outgoing data queue */ 959 while ((pdu = TAILQ_FIRST(&link->hl_txq)) != NULL) { 960 TAILQ_REMOVE(&link->hl_txq, pdu, lp_next); 961 MBUFQ_DRAIN(&pdu->lp_data); 962 if (pdu->lp_pending) 963 link->hl_unit->hci_num_acl_pkts += pdu->lp_pending; 964 965 pool_put(&l2cap_pdu_pool, pdu); 966 } 967 968 KASSERT(TAILQ_EMPTY(&link->hl_txq)); 969 970 /* ACL incoming data packet */ 971 m_freem(link->hl_rxp); 972 link->hl_rxp = NULL; 973 974 /* SCO master ACL link */ 975 if (link->hl_link != NULL) { 976 hci_acl_close(link->hl_link, err); 977 link->hl_link = NULL; 978 } 979 980 /* SCO pcb */ 981 if (link->hl_sco != NULL) { 982 struct sco_pcb *pcb; 983 984 pcb = link->hl_sco; 985 pcb->sp_link = NULL; 986 link->hl_sco = NULL; 987 (*pcb->sp_proto->disconnected)(pcb->sp_upper, err); 988 } 989 990 /* flush any SCO data */ 991 MBUFQ_DRAIN(&link->hl_data); 992 993 /* 994 * Halt the callout - if its already running we cannot free the 995 * link structure but the timeout function will call us back in 996 * any case. 997 */ 998 link->hl_state = HCI_LINK_CLOSED; 999 callout_stop(&link->hl_expire); 1000 if (callout_invoking(&link->hl_expire)) 1001 return; 1002 1003 callout_destroy(&link->hl_expire); 1004 1005 /* 1006 * If we made a note of clock offset, keep it in a memo 1007 * to facilitate reconnections to this device 1008 */ 1009 if (link->hl_clock != 0) { 1010 struct hci_memo *memo; 1011 1012 memo = hci_memo_new(link->hl_unit, &link->hl_bdaddr); 1013 if (memo != NULL) 1014 memo->clock_offset = link->hl_clock; 1015 } 1016 1017 TAILQ_REMOVE(&link->hl_unit->hci_links, link, hl_next); 1018 free(link, M_BLUETOOTH); 1019 } 1020 1021 /* 1022 * Lookup HCI link by address and type. Note that for SCO links there may 1023 * be more than one link per address, so we only return links with no 1024 * handle (ie new links) 1025 */ 1026 struct hci_link * 1027 hci_link_lookup_bdaddr(struct hci_unit *unit, bdaddr_t *bdaddr, uint8_t type) 1028 { 1029 struct hci_link *link; 1030 1031 KASSERT(unit != NULL); 1032 KASSERT(bdaddr != NULL); 1033 1034 TAILQ_FOREACH(link, &unit->hci_links, hl_next) { 1035 if (link->hl_type != type) 1036 continue; 1037 1038 if (type == HCI_LINK_SCO && link->hl_handle != 0) 1039 continue; 1040 1041 if (bdaddr_same(&link->hl_bdaddr, bdaddr)) 1042 break; 1043 } 1044 1045 return link; 1046 } 1047 1048 struct hci_link * 1049 hci_link_lookup_handle(struct hci_unit *unit, uint16_t handle) 1050 { 1051 struct hci_link *link; 1052 1053 KASSERT(unit != NULL); 1054 1055 TAILQ_FOREACH(link, &unit->hci_links, hl_next) { 1056 if (handle == link->hl_handle) 1057 break; 1058 } 1059 1060 return link; 1061 } 1062
Indexes created Sat Sep 20 22:09:52 GMT 2025