1/* $NetBSD: hci_link.c,v 1.24 2014/05/20 18:25:54 rmind 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 1.24 2014/05/20 18:25:54 rmind 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 */
58int 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 */
67struct hci_link *
68hci_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 dont 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 */
148void
149hci_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 */
171struct hci_link *
172hci_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
209void
210hci_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
252out:
253 mutex_exit(bt_lock);
254}
255
256/*
257 * Initiate any Link Mode change requests.
258 */
259int
260hci_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 */
331void
332hci_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 establshed 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 */
424void
425hci_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 (link->hl_rxp != NULL)
479 aprint_error_dev(unit->hci_dev,
480 "dropped incomplete ACL packet\n");
481
482 if (m->m_pkthdr.len < sizeof(l2cap_hdr_t))
483 goto bad;
484
485 link->hl_rxp = m;
486 got = m->m_pkthdr.len;
487 break;
488
489 case HCI_PACKET_FRAGMENT:
490 if (link->hl_rxp == NULL) {
491 aprint_error_dev(unit->hci_dev,
492 "unexpected packet fragment\n");
493
494 goto bad;
495 }
496
497 got = m->m_pkthdr.len + link->hl_rxp->m_pkthdr.len;
498 m_cat(link->hl_rxp, m);
499 m = link->hl_rxp;
500 m->m_pkthdr.len = got;
501 break;
502
503 default:
504 DPRINTF("%s: unknown packet type\n",
505 device_xname(unit->hci_dev));
506
507 goto bad;
508 }
509
510 m_copydata(m, 0, sizeof(want), &want);
511 want = le16toh(want) + sizeof(l2cap_hdr_t) - got;
512
513 if (want > 0)
514 return;
515
516 link->hl_rxp = NULL;
517
518 if (want == 0) {
519 l2cap_recv_frame(m, link);
520 return;
521 }
522
523bad:
524 m_freem(m);
525}
526
527/*
528 * Send ACL data on link
529 *
530 * We must fragment packets into chunks of less than unit->hci_max_acl_size and
531 * prepend a relevant ACL header to each fragment. We keep a PDU structure
532 * attached to the link, so that completed fragments can be marked off and
533 * more data requested from above once the PDU is sent.
534 */
535int
536hci_acl_send(struct mbuf *m, struct hci_link *link,
537 struct l2cap_channel *chan)
538{
539 struct l2cap_pdu *pdu;
540 struct mbuf *n = NULL;
541 int plen, mlen, num = 0;
542
543 KASSERT(link != NULL);
544 KASSERT(m != NULL);
545 KASSERT(m->m_flags & M_PKTHDR);
546 KASSERT(m->m_pkthdr.len > 0);
547
548 if (link->hl_state == HCI_LINK_CLOSED) {
549 m_freem(m);
550 return ENETDOWN;
551 }
552
553 pdu = pool_get(&l2cap_pdu_pool, PR_NOWAIT);
554 if (pdu == NULL)
555 goto nomem;
556
557 pdu->lp_chan = chan;
558 pdu->lp_pending = 0;
559 MBUFQ_INIT(&pdu->lp_data);
560
561 plen = m->m_pkthdr.len;
562 mlen = link->hl_unit->hci_max_acl_size;
563
564 DPRINTFN(5, "%s: handle #%d, plen = %d, max = %d\n",
565 device_xname(link->hl_unit->hci_dev), link->hl_handle, plen, mlen);
566
567 while (plen > 0) {
568 if (plen > mlen) {
569 n = m_split(m, mlen, M_DONTWAIT);
570 if (n == NULL)
571 goto nomem;
572 } else {
573 mlen = plen;
574 }
575
576 if (num++ == 0)
577 m->m_flags |= M_PROTO1; /* tag first fragment */
578
579 DPRINTFN(10, "chunk of %d (plen = %d) bytes\n", mlen, plen);
580 MBUFQ_ENQUEUE(&pdu->lp_data, m);
581 m = n;
582 plen -= mlen;
583 }
584
585 TAILQ_INSERT_TAIL(&link->hl_txq, pdu, lp_next);
586 link->hl_txqlen += num;
587
588 hci_acl_start(link);
589
590 return 0;
591
592nomem:
593 if (m) m_freem(m);
594 if (pdu) {
595 MBUFQ_DRAIN(&pdu->lp_data);
596 pool_put(&l2cap_pdu_pool, pdu);
597 }
598
599 return ENOMEM;
600}
601
602/*
603 * Start sending ACL data on link.
604 *
605 * This is called when the queue may need restarting: as new data
606 * is queued, after link mode changes have completed, or when device
607 * buffers have cleared.
608 *
609 * We may use all the available packet slots. The reason that we add
610 * the ACL encapsulation here rather than in hci_acl_send() is that L2CAP
611 * signal packets may be queued before the handle is given to us..
612 */
613void
614hci_acl_start(struct hci_link *link)
615{
616 struct hci_unit *unit;
617 hci_acldata_hdr_t *hdr;
618 struct l2cap_pdu *pdu;
619 struct mbuf *m;
620 uint16_t handle;
621
622 KASSERT(link != NULL);
623
624 unit = link->hl_unit;
625 KASSERT(unit != NULL);
626
627 /* this is mainly to block ourselves (below) */
628 if (link->hl_state != HCI_LINK_OPEN)
629 return;
630
631 if (link->hl_txqlen == 0 || unit->hci_num_acl_pkts == 0)
632 return;
633
634 /* find first PDU with data to send */
635 pdu = TAILQ_FIRST(&link->hl_txq);
636 for (;;) {
637 if (pdu == NULL)
638 return;
639
640 if (MBUFQ_FIRST(&pdu->lp_data) != NULL)
641 break;
642
643 pdu = TAILQ_NEXT(pdu, lp_next);
644 }
645
646 while (unit->hci_num_acl_pkts > 0) {
647 MBUFQ_DEQUEUE(&pdu->lp_data, m);
648 KASSERT(m != NULL);
649
650 if (m->m_flags & M_PROTO1)
651 handle = HCI_MK_CON_HANDLE(link->hl_handle,
652 HCI_PACKET_START, 0);
653 else
654 handle = HCI_MK_CON_HANDLE(link->hl_handle,
655 HCI_PACKET_FRAGMENT, 0);
656
657 M_PREPEND(m, sizeof(*hdr), M_DONTWAIT);
658 if (m == NULL)
659 break;
660
661 hdr = mtod(m, hci_acldata_hdr_t *);
662 hdr->type = HCI_ACL_DATA_PKT;
663 hdr->con_handle = htole16(handle);
664 hdr->length = htole16(m->m_pkthdr.len - sizeof(*hdr));
665
666 link->hl_txqlen--;
667 pdu->lp_pending++;
668
669 hci_output_acl(unit, m);
670
671 if (MBUFQ_FIRST(&pdu->lp_data) == NULL) {
672 if (pdu->lp_chan) {
673 /*
674 * This should enable streaming of PDUs - when
675 * we have placed all the fragments on the acl
676 * output queue, we trigger the L2CAP layer to
677 * send us down one more. Use a false state so
678 * we dont run into ourselves coming back from
679 * the future..
680 */
681 link->hl_state = HCI_LINK_BLOCK;
682 l2cap_start(pdu->lp_chan);
683 link->hl_state = HCI_LINK_OPEN;
684 }
685
686 pdu = TAILQ_NEXT(pdu, lp_next);
687 if (pdu == NULL)
688 break;
689 }
690 }
691
692 /*
693 * We had our turn now, move to the back of the queue to let
694 * other links have a go at the output buffers..
695 */
696 if (TAILQ_NEXT(link, hl_next)) {
697 TAILQ_REMOVE(&unit->hci_links, link, hl_next);
698 TAILQ_INSERT_TAIL(&unit->hci_links, link, hl_next);
699 }
700}
701
702/*
703 * Confirm ACL packets cleared from Controller buffers. We scan our PDU
704 * list to clear pending fragments and signal upstream for more data
705 * when a PDU is complete.
706 */
707void
708hci_acl_complete(struct hci_link *link, int num)
709{
710 struct l2cap_pdu *pdu;
711 struct l2cap_channel *chan;
712
713 DPRINTFN(5, "handle #%d (%d)\n", link->hl_handle, num);
714
715 while (num > 0) {
716 pdu = TAILQ_FIRST(&link->hl_txq);
717 if (pdu == NULL) {
718 aprint_error_dev(link->hl_unit->hci_dev,
719 "%d packets completed on handle #%x but none pending!\n",
720 num, link->hl_handle);
721
722 return;
723 }
724
725 if (num >= pdu->lp_pending) {
726 num -= pdu->lp_pending;
727 pdu->lp_pending = 0;
728
729 if (MBUFQ_FIRST(&pdu->lp_data) == NULL) {
730 TAILQ_REMOVE(&link->hl_txq, pdu, lp_next);
731 chan = pdu->lp_chan;
732 if (chan != NULL) {
733 chan->lc_pending--;
734 (*chan->lc_proto->complete)
735 (chan->lc_upper, 1);
736
737 if (chan->lc_pending == 0)
738 l2cap_start(chan);
739 }
740
741 pool_put(&l2cap_pdu_pool, pdu);
742 }
743 } else {
744 pdu->lp_pending -= num;
745 num = 0;
746 }
747 }
748}
749
750/*******************************************************************************
751 *
752 * HCI SCO Connections
753 */
754
755/*
756 * Incoming SCO Connection. We check the list for anybody willing
757 * to take it.
758 */
759struct hci_link *
760hci_sco_newconn(struct hci_unit *unit, bdaddr_t *bdaddr)
761{
762 struct sockaddr_bt laddr, raddr;
763 struct sco_pcb *pcb, *new;
764 struct hci_link *sco, *acl;
765
766 memset(&laddr, 0, sizeof(laddr));
767 laddr.bt_len = sizeof(laddr);
768 laddr.bt_family = AF_BLUETOOTH;
769 bdaddr_copy(&laddr.bt_bdaddr, &unit->hci_bdaddr);
770
771 memset(&raddr, 0, sizeof(raddr));
772 raddr.bt_len = sizeof(raddr);
773 raddr.bt_family = AF_BLUETOOTH;
774 bdaddr_copy(&raddr.bt_bdaddr, bdaddr);
775
776 /*
777 * There should already be an ACL link up and running before
778 * the controller sends us SCO connection requests, but you
779 * never know..
780 */
781 acl = hci_link_lookup_bdaddr(unit, bdaddr, HCI_LINK_ACL);
782 if (acl == NULL || acl->hl_state != HCI_LINK_OPEN)
783 return NULL;
784
785 LIST_FOREACH(pcb, &sco_pcb, sp_next) {
786 if ((pcb->sp_flags & SP_LISTENING) == 0)
787 continue;
788
789 new = (*pcb->sp_proto->newconn)(pcb->sp_upper, &laddr, &raddr);
790 if (new == NULL)
791 continue;
792
793 /*
794 * Ok, got new pcb so we can start a new link and fill
795 * in all the details.
796 */
797 bdaddr_copy(&new->sp_laddr, &unit->hci_bdaddr);
798 bdaddr_copy(&new->sp_raddr, bdaddr);
799
800 sco = hci_link_alloc(unit, bdaddr, HCI_LINK_SCO);
801 if (sco == NULL) {
802 sco_detach_pcb(&new);
803 return NULL;
804 }
805
806 sco->hl_link = hci_acl_open(unit, bdaddr);
807 KASSERT(sco->hl_link == acl);
808
809 sco->hl_sco = new;
810 new->sp_link = sco;
811
812 new->sp_mtu = unit->hci_max_sco_size;
813 return sco;
814 }
815
816 return NULL;
817}
818
819/*
820 * receive SCO packet, we only need to strip the header and send
821 * it to the right handler
822 */
823void
824hci_sco_recv(struct mbuf *m, struct hci_unit *unit)
825{
826 struct hci_link *link;
827 hci_scodata_hdr_t hdr;
828 uint16_t handle;
829
830 KASSERT(m != NULL);
831 KASSERT(unit != NULL);
832
833 if (m->m_pkthdr.len < sizeof(hdr))
834 goto bad;
835
836 m_copydata(m, 0, sizeof(hdr), &hdr);
837 m_adj(m, sizeof(hdr));
838
839 KASSERT(hdr.type == HCI_SCO_DATA_PKT);
840
841 hdr.con_handle = le16toh(hdr.con_handle);
842 handle = HCI_CON_HANDLE(hdr.con_handle);
843
844 if (m->m_pkthdr.len != hdr.length)
845 goto bad;
846
847 link = hci_link_lookup_handle(unit, handle);
848 if (link == NULL || link->hl_type == HCI_LINK_ACL) {
849 DPRINTF("%s: dumping packet for unknown handle #%d\n",
850 device_xname(unit->hci_dev), handle);
851
852 goto bad;
853 }
854
855 (*link->hl_sco->sp_proto->input)(link->hl_sco->sp_upper, m);
856 return;
857
858bad:
859 m_freem(m);
860}
861
862void
863hci_sco_start(struct hci_link *link)
864{
865}
866
867/*
868 * SCO packets have completed at the controller, so we can
869 * signal up to free the buffer space.
870 */
871void
872hci_sco_complete(struct hci_link *link, int num)
873{
874
875 DPRINTFN(5, "handle #%d (num=%d)\n", link->hl_handle, num);
876 link->hl_sco->sp_pending--;
877 (*link->hl_sco->sp_proto->complete)(link->hl_sco->sp_upper, num);
878}
879
880/*******************************************************************************
881 *
882 * Generic HCI Connection alloc/free/lookup etc
883 */
884
885struct hci_link *
886hci_link_alloc(struct hci_unit *unit, bdaddr_t *bdaddr, uint8_t type)
887{
888 struct hci_link *link;
889
890 KASSERT(unit != NULL);
891
892 link = malloc(sizeof(struct hci_link), M_BLUETOOTH, M_NOWAIT | M_ZERO);
893 if (link == NULL)
894 return NULL;
895
896 link->hl_unit = unit;
897 link->hl_type = type;
898 link->hl_state = HCI_LINK_CLOSED;
899 bdaddr_copy(&link->hl_bdaddr, bdaddr);
900
901 /* init ACL portion */
902 callout_init(&link->hl_expire, 0);
903 callout_setfunc(&link->hl_expire, hci_acl_timeout, link);
904
905 TAILQ_INIT(&link->hl_txq); /* outgoing packets */
906 TAILQ_INIT(&link->hl_reqs); /* request queue */
907
908 link->hl_mtu = L2CAP_MTU_DEFAULT; /* L2CAP signal mtu */
909 link->hl_flush = L2CAP_FLUSH_TIMO_DEFAULT; /* flush timeout */
910
911 /* init SCO portion */
912 MBUFQ_INIT(&link->hl_data);
913
914 /* attach to unit */
915 TAILQ_INSERT_TAIL(&unit->hci_links, link, hl_next);
916 return link;
917}
918
919void
920hci_link_free(struct hci_link *link, int err)
921{
922 struct l2cap_req *req;
923 struct l2cap_pdu *pdu;
924 struct l2cap_channel *chan, *next;
925
926 KASSERT(link != NULL);
927
928 DPRINTF("#%d, type = %d, state = %d, refcnt = %d\n",
929 link->hl_handle, link->hl_type,
930 link->hl_state, link->hl_refcnt);
931
932 /* ACL reference count */
933 if (link->hl_refcnt > 0) {
934 next = LIST_FIRST(&l2cap_active_list);
935 while ((chan = next) != NULL) {
936 next = LIST_NEXT(chan, lc_ncid);
937 if (chan->lc_link == link)
938 l2cap_close(chan, err);
939 }
940 }
941 KASSERT(link->hl_refcnt == 0);
942
943 /* ACL L2CAP requests.. */
944 while ((req = TAILQ_FIRST(&link->hl_reqs)) != NULL)
945 l2cap_request_free(req);
946
947 KASSERT(TAILQ_EMPTY(&link->hl_reqs));
948
949 /* ACL outgoing data queue */
950 while ((pdu = TAILQ_FIRST(&link->hl_txq)) != NULL) {
951 TAILQ_REMOVE(&link->hl_txq, pdu, lp_next);
952 MBUFQ_DRAIN(&pdu->lp_data);
953 if (pdu->lp_pending)
954 link->hl_unit->hci_num_acl_pkts += pdu->lp_pending;
955
956 pool_put(&l2cap_pdu_pool, pdu);
957 }
958
959 KASSERT(TAILQ_EMPTY(&link->hl_txq));
960
961 /* ACL incoming data packet */
962 if (link->hl_rxp != NULL) {
963 m_freem(link->hl_rxp);
964 link->hl_rxp = NULL;
965 }
966
967 /* SCO master ACL link */
968 if (link->hl_link != NULL) {
969 hci_acl_close(link->hl_link, err);
970 link->hl_link = NULL;
971 }
972
973 /* SCO pcb */
974 if (link->hl_sco != NULL) {
975 struct sco_pcb *pcb;
976
977 pcb = link->hl_sco;
978 pcb->sp_link = NULL;
979 link->hl_sco = NULL;
980 (*pcb->sp_proto->disconnected)(pcb->sp_upper, err);
981 }
982
983 /* flush any SCO data */
984 MBUFQ_DRAIN(&link->hl_data);
985
986 /*
987 * Halt the callout - if its already running we cannot free the
988 * link structure but the timeout function will call us back in
989 * any case.
990 */
991 link->hl_state = HCI_LINK_CLOSED;
992 callout_stop(&link->hl_expire);
993 if (callout_invoking(&link->hl_expire))
994 return;
995
996 callout_destroy(&link->hl_expire);
997
998 /*
999 * If we made a note of clock offset, keep it in a memo
1000 * to facilitate reconnections to this device
1001 */
1002 if (link->hl_clock != 0) {
1003 struct hci_memo *memo;
1004
1005 memo = hci_memo_new(link->hl_unit, &link->hl_bdaddr);
1006 if (memo != NULL)
1007 memo->clock_offset = link->hl_clock;
1008 }
1009
1010 TAILQ_REMOVE(&link->hl_unit->hci_links, link, hl_next);
1011 free(link, M_BLUETOOTH);
1012}
1013
1014/*
1015 * Lookup HCI link by address and type. Note that for SCO links there may
1016 * be more than one link per address, so we only return links with no
1017 * handle (ie new links)
1018 */
1019struct hci_link *
1020hci_link_lookup_bdaddr(struct hci_unit *unit, bdaddr_t *bdaddr, uint8_t type)
1021{
1022 struct hci_link *link;
1023
1024 KASSERT(unit != NULL);
1025 KASSERT(bdaddr != NULL);
1026
1027 TAILQ_FOREACH(link, &unit->hci_links, hl_next) {
1028 if (link->hl_type != type)
1029 continue;
1030
1031 if (type == HCI_LINK_SCO && link->hl_handle != 0)
1032 continue;
1033
1034 if (bdaddr_same(&link->hl_bdaddr, bdaddr))
1035 break;
1036 }
1037
1038 return link;
1039}
1040
1041struct hci_link *
1042hci_link_lookup_handle(struct hci_unit *unit, uint16_t handle)
1043{
1044 struct hci_link *link;
1045
1046 KASSERT(unit != NULL);
1047
1048 TAILQ_FOREACH(link, &unit->hci_links, hl_next) {
1049 if (handle == link->hl_handle)
1050 break;
1051 }
1052
1053 return link;
1054}
1055