hci_link.c revision 1.21.2.1 1 /* $NetBSD: hci_link.c,v 1.21.2.1 2010/10/22 07:22:39 uebayasi 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 1.21.2.1 2010/10/22 07:22:39 uebayasi 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 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 */
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 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 */
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 KASSERT(m->m_pkthdr.len >= sizeof(hdr));
436 m_copydata(m, 0, sizeof(hdr), &hdr);
437 m_adj(m, sizeof(hdr));
438
439 #ifdef DIAGNOSTIC
440 if (hdr.type != HCI_ACL_DATA_PKT) {
441 aprint_error_dev(unit->hci_dev, "bad ACL packet type\n");
442 goto bad;
443 }
444
445 if (m->m_pkthdr.len != le16toh(hdr.length)) {
446 aprint_error_dev(unit->hci_dev,
447 "bad ACL packet length (%d != %d)\n",
448 m->m_pkthdr.len, le16toh(hdr.length));
449 goto bad;
450 }
451 #endif
452
453 hdr.length = le16toh(hdr.length);
454 hdr.con_handle = le16toh(hdr.con_handle);
455 handle = HCI_CON_HANDLE(hdr.con_handle);
456 pb = HCI_PB_FLAG(hdr.con_handle);
457
458 link = hci_link_lookup_handle(unit, handle);
459 if (link == NULL) {
460 hci_discon_cp cp;
461
462 DPRINTF("%s: dumping packet for unknown handle #%d\n",
463 device_xname(unit->hci_dev), handle);
464
465 /*
466 * There is no way to find out what this connection handle is
467 * for, just get rid of it. This may happen, if a USB dongle
468 * is plugged into a self powered hub and does not reset when
469 * the system is shut down.
470 *
471 * This can cause a problem with some Broadcom controllers
472 * which emit empty ACL packets during connection setup, so
473 * only disconnect where data is present.
474 */
475 if (hdr.length > 0) {
476 cp.con_handle = htole16(handle);
477 cp.reason = 0x13;/*"Remote User Terminated Connection"*/
478 hci_send_cmd(unit, HCI_CMD_DISCONNECT, &cp, sizeof(cp));
479 }
480 goto bad;
481 }
482
483 switch (pb) {
484 case HCI_PACKET_START:
485 if (link->hl_rxp != NULL)
486 aprint_error_dev(unit->hci_dev,
487 "dropped incomplete ACL packet\n");
488
489 if (m->m_pkthdr.len < sizeof(l2cap_hdr_t)) {
490 aprint_error_dev(unit->hci_dev, "short ACL packet\n");
491 goto bad;
492 }
493
494 link->hl_rxp = m;
495 got = m->m_pkthdr.len;
496 break;
497
498 case HCI_PACKET_FRAGMENT:
499 if (link->hl_rxp == NULL) {
500 aprint_error_dev(unit->hci_dev,
501 "unexpected packet fragment\n");
502
503 goto bad;
504 }
505
506 got = m->m_pkthdr.len + link->hl_rxp->m_pkthdr.len;
507 m_cat(link->hl_rxp, m);
508 m = link->hl_rxp;
509 m->m_pkthdr.len = got;
510 break;
511
512 default:
513 aprint_error_dev(unit->hci_dev, "unknown packet type\n");
514 goto bad;
515 }
516
517 m_copydata(m, 0, sizeof(want), &want);
518 want = le16toh(want) + sizeof(l2cap_hdr_t) - got;
519
520 if (want > 0)
521 return;
522
523 link->hl_rxp = NULL;
524
525 if (want == 0) {
526 l2cap_recv_frame(m, link);
527 return;
528 }
529
530 bad:
531 m_freem(m);
532 }
533
534 /*
535 * Send ACL data on link
536 *
537 * We must fragment packets into chunks of less than unit->hci_max_acl_size and
538 * prepend a relevant ACL header to each fragment. We keep a PDU structure
539 * attached to the link, so that completed fragments can be marked off and
540 * more data requested from above once the PDU is sent.
541 */
542 int
543 hci_acl_send(struct mbuf *m, struct hci_link *link,
544 struct l2cap_channel *chan)
545 {
546 struct l2cap_pdu *pdu;
547 struct mbuf *n = NULL;
548 int plen, mlen, num = 0;
549
550 KASSERT(link != NULL);
551 KASSERT(m != NULL);
552 KASSERT(m->m_flags & M_PKTHDR);
553 KASSERT(m->m_pkthdr.len > 0);
554
555 if (link->hl_state == HCI_LINK_CLOSED) {
556 m_freem(m);
557 return ENETDOWN;
558 }
559
560 pdu = pool_get(&l2cap_pdu_pool, PR_NOWAIT);
561 if (pdu == NULL)
562 goto nomem;
563
564 pdu->lp_chan = chan;
565 pdu->lp_pending = 0;
566 MBUFQ_INIT(&pdu->lp_data);
567
568 plen = m->m_pkthdr.len;
569 mlen = link->hl_unit->hci_max_acl_size;
570
571 DPRINTFN(5, "%s: handle #%d, plen = %d, max = %d\n",
572 device_xname(link->hl_unit->hci_dev), link->hl_handle, plen, mlen);
573
574 while (plen > 0) {
575 if (plen > mlen) {
576 n = m_split(m, mlen, M_DONTWAIT);
577 if (n == NULL)
578 goto nomem;
579 } else {
580 mlen = plen;
581 }
582
583 if (num++ == 0)
584 m->m_flags |= M_PROTO1; /* tag first fragment */
585
586 DPRINTFN(10, "chunk of %d (plen = %d) bytes\n", mlen, plen);
587 MBUFQ_ENQUEUE(&pdu->lp_data, m);
588 m = n;
589 plen -= mlen;
590 }
591
592 TAILQ_INSERT_TAIL(&link->hl_txq, pdu, lp_next);
593 link->hl_txqlen += num;
594
595 hci_acl_start(link);
596
597 return 0;
598
599 nomem:
600 if (m) m_freem(m);
601 if (pdu) {
602 MBUFQ_DRAIN(&pdu->lp_data);
603 pool_put(&l2cap_pdu_pool, pdu);
604 }
605
606 return ENOMEM;
607 }
608
609 /*
610 * Start sending ACL data on link.
611 *
612 * This is called when the queue may need restarting: as new data
613 * is queued, after link mode changes have completed, or when device
614 * buffers have cleared.
615 *
616 * We may use all the available packet slots. The reason that we add
617 * the ACL encapsulation here rather than in hci_acl_send() is that L2CAP
618 * signal packets may be queued before the handle is given to us..
619 */
620 void
621 hci_acl_start(struct hci_link *link)
622 {
623 struct hci_unit *unit;
624 hci_acldata_hdr_t *hdr;
625 struct l2cap_pdu *pdu;
626 struct mbuf *m;
627 uint16_t handle;
628
629 KASSERT(link != NULL);
630
631 unit = link->hl_unit;
632 KASSERT(unit != NULL);
633
634 /* this is mainly to block ourselves (below) */
635 if (link->hl_state != HCI_LINK_OPEN)
636 return;
637
638 if (link->hl_txqlen == 0 || unit->hci_num_acl_pkts == 0)
639 return;
640
641 /* find first PDU with data to send */
642 pdu = TAILQ_FIRST(&link->hl_txq);
643 for (;;) {
644 if (pdu == NULL)
645 return;
646
647 if (MBUFQ_FIRST(&pdu->lp_data) != NULL)
648 break;
649
650 pdu = TAILQ_NEXT(pdu, lp_next);
651 }
652
653 while (unit->hci_num_acl_pkts > 0) {
654 MBUFQ_DEQUEUE(&pdu->lp_data, m);
655 KASSERT(m != NULL);
656
657 if (m->m_flags & M_PROTO1)
658 handle = HCI_MK_CON_HANDLE(link->hl_handle,
659 HCI_PACKET_START, 0);
660 else
661 handle = HCI_MK_CON_HANDLE(link->hl_handle,
662 HCI_PACKET_FRAGMENT, 0);
663
664 M_PREPEND(m, sizeof(*hdr), M_DONTWAIT);
665 if (m == NULL)
666 break;
667
668 hdr = mtod(m, hci_acldata_hdr_t *);
669 hdr->type = HCI_ACL_DATA_PKT;
670 hdr->con_handle = htole16(handle);
671 hdr->length = htole16(m->m_pkthdr.len - sizeof(*hdr));
672
673 link->hl_txqlen--;
674 pdu->lp_pending++;
675
676 hci_output_acl(unit, m);
677
678 if (MBUFQ_FIRST(&pdu->lp_data) == NULL) {
679 if (pdu->lp_chan) {
680 /*
681 * This should enable streaming of PDUs - when
682 * we have placed all the fragments on the acl
683 * output queue, we trigger the L2CAP layer to
684 * send us down one more. Use a false state so
685 * we dont run into ourselves coming back from
686 * the future..
687 */
688 link->hl_state = HCI_LINK_BLOCK;
689 l2cap_start(pdu->lp_chan);
690 link->hl_state = HCI_LINK_OPEN;
691 }
692
693 pdu = TAILQ_NEXT(pdu, lp_next);
694 if (pdu == NULL)
695 break;
696 }
697 }
698
699 /*
700 * We had our turn now, move to the back of the queue to let
701 * other links have a go at the output buffers..
702 */
703 if (TAILQ_NEXT(link, hl_next)) {
704 TAILQ_REMOVE(&unit->hci_links, link, hl_next);
705 TAILQ_INSERT_TAIL(&unit->hci_links, link, hl_next);
706 }
707 }
708
709 /*
710 * Confirm ACL packets cleared from Controller buffers. We scan our PDU
711 * list to clear pending fragments and signal upstream for more data
712 * when a PDU is complete.
713 */
714 void
715 hci_acl_complete(struct hci_link *link, int num)
716 {
717 struct l2cap_pdu *pdu;
718 struct l2cap_channel *chan;
719
720 DPRINTFN(5, "handle #%d (%d)\n", link->hl_handle, num);
721
722 while (num > 0) {
723 pdu = TAILQ_FIRST(&link->hl_txq);
724 if (pdu == NULL) {
725 aprint_error_dev(link->hl_unit->hci_dev,
726 "%d packets completed on handle #%x but none pending!\n",
727 num, link->hl_handle);
728
729 return;
730 }
731
732 if (num >= pdu->lp_pending) {
733 num -= pdu->lp_pending;
734 pdu->lp_pending = 0;
735
736 if (MBUFQ_FIRST(&pdu->lp_data) == NULL) {
737 TAILQ_REMOVE(&link->hl_txq, pdu, lp_next);
738 chan = pdu->lp_chan;
739 if (chan != NULL) {
740 chan->lc_pending--;
741 (*chan->lc_proto->complete)
742 (chan->lc_upper, 1);
743
744 if (chan->lc_pending == 0)
745 l2cap_start(chan);
746 }
747
748 pool_put(&l2cap_pdu_pool, pdu);
749 }
750 } else {
751 pdu->lp_pending -= num;
752 num = 0;
753 }
754 }
755 }
756
757 /*******************************************************************************
758 *
759 * HCI SCO Connections
760 */
761
762 /*
763 * Incoming SCO Connection. We check the list for anybody willing
764 * to take it.
765 */
766 struct hci_link *
767 hci_sco_newconn(struct hci_unit *unit, bdaddr_t *bdaddr)
768 {
769 struct sockaddr_bt laddr, raddr;
770 struct sco_pcb *pcb, *new;
771 struct hci_link *sco, *acl;
772
773 memset(&laddr, 0, sizeof(laddr));
774 laddr.bt_len = sizeof(laddr);
775 laddr.bt_family = AF_BLUETOOTH;
776 bdaddr_copy(&laddr.bt_bdaddr, &unit->hci_bdaddr);
777
778 memset(&raddr, 0, sizeof(raddr));
779 raddr.bt_len = sizeof(raddr);
780 raddr.bt_family = AF_BLUETOOTH;
781 bdaddr_copy(&raddr.bt_bdaddr, bdaddr);
782
783 /*
784 * There should already be an ACL link up and running before
785 * the controller sends us SCO connection requests, but you
786 * never know..
787 */
788 acl = hci_link_lookup_bdaddr(unit, bdaddr, HCI_LINK_ACL);
789 if (acl == NULL || acl->hl_state != HCI_LINK_OPEN)
790 return NULL;
791
792 LIST_FOREACH(pcb, &sco_pcb, sp_next) {
793 if ((pcb->sp_flags & SP_LISTENING) == 0)
794 continue;
795
796 new = (*pcb->sp_proto->newconn)(pcb->sp_upper, &laddr, &raddr);
797 if (new == NULL)
798 continue;
799
800 /*
801 * Ok, got new pcb so we can start a new link and fill
802 * in all the details.
803 */
804 bdaddr_copy(&new->sp_laddr, &unit->hci_bdaddr);
805 bdaddr_copy(&new->sp_raddr, bdaddr);
806
807 sco = hci_link_alloc(unit, bdaddr, HCI_LINK_SCO);
808 if (sco == NULL) {
809 sco_detach(&new);
810 return NULL;
811 }
812
813 sco->hl_link = hci_acl_open(unit, bdaddr);
814 KASSERT(sco->hl_link == acl);
815
816 sco->hl_sco = new;
817 new->sp_link = sco;
818
819 new->sp_mtu = unit->hci_max_sco_size;
820 return sco;
821 }
822
823 return NULL;
824 }
825
826 /*
827 * receive SCO packet, we only need to strip the header and send
828 * it to the right handler
829 */
830 void
831 hci_sco_recv(struct mbuf *m, struct hci_unit *unit)
832 {
833 struct hci_link *link;
834 hci_scodata_hdr_t hdr;
835 uint16_t handle;
836
837 KASSERT(m != NULL);
838 KASSERT(unit != NULL);
839
840 KASSERT(m->m_pkthdr.len >= sizeof(hdr));
841 m_copydata(m, 0, sizeof(hdr), &hdr);
842 m_adj(m, sizeof(hdr));
843
844 #ifdef DIAGNOSTIC
845 if (hdr.type != HCI_SCO_DATA_PKT) {
846 aprint_error_dev(unit->hci_dev, "bad SCO packet type\n");
847 goto bad;
848 }
849
850 if (m->m_pkthdr.len != hdr.length) {
851 aprint_error_dev(unit->hci_dev,
852 "bad SCO packet length (%d != %d)\n",
853 m->m_pkthdr.len, hdr.length);
854
855 goto bad;
856 }
857 #endif
858
859 hdr.con_handle = le16toh(hdr.con_handle);
860 handle = HCI_CON_HANDLE(hdr.con_handle);
861
862 link = hci_link_lookup_handle(unit, handle);
863 if (link == NULL || link->hl_type == HCI_LINK_ACL) {
864 DPRINTF("%s: dumping packet for unknown handle #%d\n",
865 device_xname(unit->hci_dev), handle);
866
867 goto bad;
868 }
869
870 (*link->hl_sco->sp_proto->input)(link->hl_sco->sp_upper, m);
871 return;
872
873 bad:
874 m_freem(m);
875 }
876
877 void
878 hci_sco_start(struct hci_link *link)
879 {
880 }
881
882 /*
883 * SCO packets have completed at the controller, so we can
884 * signal up to free the buffer space.
885 */
886 void
887 hci_sco_complete(struct hci_link *link, int num)
888 {
889
890 DPRINTFN(5, "handle #%d (num=%d)\n", link->hl_handle, num);
891 link->hl_sco->sp_pending--;
892 (*link->hl_sco->sp_proto->complete)(link->hl_sco->sp_upper, num);
893 }
894
895 /*******************************************************************************
896 *
897 * Generic HCI Connection alloc/free/lookup etc
898 */
899
900 struct hci_link *
901 hci_link_alloc(struct hci_unit *unit, bdaddr_t *bdaddr, uint8_t type)
902 {
903 struct hci_link *link;
904
905 KASSERT(unit != NULL);
906
907 link = malloc(sizeof(struct hci_link), M_BLUETOOTH, M_NOWAIT | M_ZERO);
908 if (link == NULL)
909 return NULL;
910
911 link->hl_unit = unit;
912 link->hl_type = type;
913 link->hl_state = HCI_LINK_CLOSED;
914 bdaddr_copy(&link->hl_bdaddr, bdaddr);
915
916 /* init ACL portion */
917 callout_init(&link->hl_expire, 0);
918 callout_setfunc(&link->hl_expire, hci_acl_timeout, link);
919
920 TAILQ_INIT(&link->hl_txq); /* outgoing packets */
921 TAILQ_INIT(&link->hl_reqs); /* request queue */
922
923 link->hl_mtu = L2CAP_MTU_DEFAULT; /* L2CAP signal mtu */
924 link->hl_flush = L2CAP_FLUSH_TIMO_DEFAULT; /* flush timeout */
925
926 /* init SCO portion */
927 MBUFQ_INIT(&link->hl_data);
928
929 /* attach to unit */
930 TAILQ_INSERT_TAIL(&unit->hci_links, link, hl_next);
931 return link;
932 }
933
934 void
935 hci_link_free(struct hci_link *link, int err)
936 {
937 struct l2cap_req *req;
938 struct l2cap_pdu *pdu;
939 struct l2cap_channel *chan, *next;
940
941 KASSERT(link != NULL);
942
943 DPRINTF("#%d, type = %d, state = %d, refcnt = %d\n",
944 link->hl_handle, link->hl_type,
945 link->hl_state, link->hl_refcnt);
946
947 /* ACL reference count */
948 if (link->hl_refcnt > 0) {
949 next = LIST_FIRST(&l2cap_active_list);
950 while ((chan = next) != NULL) {
951 next = LIST_NEXT(chan, lc_ncid);
952 if (chan->lc_link == link)
953 l2cap_close(chan, err);
954 }
955 }
956 KASSERT(link->hl_refcnt == 0);
957
958 /* ACL L2CAP requests.. */
959 while ((req = TAILQ_FIRST(&link->hl_reqs)) != NULL)
960 l2cap_request_free(req);
961
962 KASSERT(TAILQ_EMPTY(&link->hl_reqs));
963
964 /* ACL outgoing data queue */
965 while ((pdu = TAILQ_FIRST(&link->hl_txq)) != NULL) {
966 TAILQ_REMOVE(&link->hl_txq, pdu, lp_next);
967 MBUFQ_DRAIN(&pdu->lp_data);
968 if (pdu->lp_pending)
969 link->hl_unit->hci_num_acl_pkts += pdu->lp_pending;
970
971 pool_put(&l2cap_pdu_pool, pdu);
972 }
973
974 KASSERT(TAILQ_EMPTY(&link->hl_txq));
975
976 /* ACL incoming data packet */
977 if (link->hl_rxp != NULL) {
978 m_freem(link->hl_rxp);
979 link->hl_rxp = NULL;
980 }
981
982 /* SCO master ACL link */
983 if (link->hl_link != NULL) {
984 hci_acl_close(link->hl_link, err);
985 link->hl_link = NULL;
986 }
987
988 /* SCO pcb */
989 if (link->hl_sco != NULL) {
990 struct sco_pcb *pcb;
991
992 pcb = link->hl_sco;
993 pcb->sp_link = NULL;
994 link->hl_sco = NULL;
995 (*pcb->sp_proto->disconnected)(pcb->sp_upper, err);
996 }
997
998 /* flush any SCO data */
999 MBUFQ_DRAIN(&link->hl_data);
1000
1001 /*
1002 * Halt the callout - if its already running we cannot free the
1003 * link structure but the timeout function will call us back in
1004 * any case.
1005 */
1006 link->hl_state = HCI_LINK_CLOSED;
1007 callout_stop(&link->hl_expire);
1008 if (callout_invoking(&link->hl_expire))
1009 return;
1010
1011 callout_destroy(&link->hl_expire);
1012
1013 /*
1014 * If we made a note of clock offset, keep it in a memo
1015 * to facilitate reconnections to this device
1016 */
1017 if (link->hl_clock != 0) {
1018 struct hci_memo *memo;
1019
1020 memo = hci_memo_new(link->hl_unit, &link->hl_bdaddr);
1021 if (memo != NULL)
1022 memo->clock_offset = link->hl_clock;
1023 }
1024
1025 TAILQ_REMOVE(&link->hl_unit->hci_links, link, hl_next);
1026 free(link, M_BLUETOOTH);
1027 }
1028
1029 /*
1030 * Lookup HCI link by address and type. Note that for SCO links there may
1031 * be more than one link per address, so we only return links with no
1032 * handle (ie new links)
1033 */
1034 struct hci_link *
1035 hci_link_lookup_bdaddr(struct hci_unit *unit, bdaddr_t *bdaddr, uint8_t type)
1036 {
1037 struct hci_link *link;
1038
1039 KASSERT(unit != NULL);
1040 KASSERT(bdaddr != NULL);
1041
1042 TAILQ_FOREACH(link, &unit->hci_links, hl_next) {
1043 if (link->hl_type != type)
1044 continue;
1045
1046 if (type == HCI_LINK_SCO && link->hl_handle != 0)
1047 continue;
1048
1049 if (bdaddr_same(&link->hl_bdaddr, bdaddr))
1050 break;
1051 }
1052
1053 return link;
1054 }
1055
1056 struct hci_link *
1057 hci_link_lookup_handle(struct hci_unit *unit, uint16_t handle)
1058 {
1059 struct hci_link *link;
1060
1061 KASSERT(unit != NULL);
1062
1063 TAILQ_FOREACH(link, &unit->hci_links, hl_next) {
1064 if (handle == link->hl_handle)
1065 break;
1066 }
1067
1068 return link;
1069 }
1070