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 Copyright (c) 2012 Code Aurora Forum. All rights reserved.
9 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License version 2 as
13 published by the Free Software Foundation;
15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
16 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
18 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
19 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
20 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
21 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
22 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
24 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
25 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
26 SOFTWARE IS DISCLAIMED.
29 /* Bluetooth L2CAP core. */
31 #include <linux/module.h>
33 #include <linux/debugfs.h>
34 #include <linux/crc16.h>
35 #include <linux/filter.h>
37 #include <net/bluetooth/bluetooth.h>
38 #include <net/bluetooth/hci_core.h>
39 #include <net/bluetooth/l2cap.h>
45 #define LE_FLOWCTL_MAX_CREDITS 65535
49 static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN | L2CAP_FEAT_UCD;
51 static LIST_HEAD(chan_list);
52 static DEFINE_RWLOCK(chan_list_lock);
54 static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
55 u8 code, u8 ident, u16 dlen, void *data);
56 static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
58 static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data, size_t data_size);
59 static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err);
61 static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
62 struct sk_buff_head *skbs, u8 event);
64 static inline u8 bdaddr_type(u8 link_type, u8 bdaddr_type)
66 if (link_type == LE_LINK) {
67 if (bdaddr_type == ADDR_LE_DEV_PUBLIC)
68 return BDADDR_LE_PUBLIC;
70 return BDADDR_LE_RANDOM;
76 static inline u8 bdaddr_src_type(struct hci_conn *hcon)
78 return bdaddr_type(hcon->type, hcon->src_type);
81 static inline u8 bdaddr_dst_type(struct hci_conn *hcon)
83 return bdaddr_type(hcon->type, hcon->dst_type);
86 /* ---- L2CAP channels ---- */
88 static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
93 list_for_each_entry(c, &conn->chan_l, list) {
100 static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn,
103 struct l2cap_chan *c;
105 list_for_each_entry(c, &conn->chan_l, list) {
112 /* Find channel with given SCID.
113 * Returns locked channel. */
114 static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn,
117 struct l2cap_chan *c;
119 mutex_lock(&conn->chan_lock);
120 c = __l2cap_get_chan_by_scid(conn, cid);
123 mutex_unlock(&conn->chan_lock);
128 /* Find channel with given DCID.
129 * Returns locked channel.
131 static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
134 struct l2cap_chan *c;
136 mutex_lock(&conn->chan_lock);
137 c = __l2cap_get_chan_by_dcid(conn, cid);
140 mutex_unlock(&conn->chan_lock);
145 static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn,
148 struct l2cap_chan *c;
150 list_for_each_entry(c, &conn->chan_l, list) {
151 if (c->ident == ident)
157 static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn,
160 struct l2cap_chan *c;
162 mutex_lock(&conn->chan_lock);
163 c = __l2cap_get_chan_by_ident(conn, ident);
166 mutex_unlock(&conn->chan_lock);
171 static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
173 struct l2cap_chan *c;
175 list_for_each_entry(c, &chan_list, global_l) {
176 if (c->sport == psm && !bacmp(&c->src, src))
182 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
186 write_lock(&chan_list_lock);
188 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
198 u16 p, start, end, incr;
200 if (chan->src_type == BDADDR_BREDR) {
201 start = L2CAP_PSM_DYN_START;
202 end = L2CAP_PSM_AUTO_END;
205 start = L2CAP_PSM_LE_DYN_START;
206 end = L2CAP_PSM_LE_DYN_END;
211 for (p = start; p <= end; p += incr)
212 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
213 chan->psm = cpu_to_le16(p);
214 chan->sport = cpu_to_le16(p);
221 write_unlock(&chan_list_lock);
224 EXPORT_SYMBOL_GPL(l2cap_add_psm);
226 int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
228 write_lock(&chan_list_lock);
230 /* Override the defaults (which are for conn-oriented) */
231 chan->omtu = L2CAP_DEFAULT_MTU;
232 chan->chan_type = L2CAP_CHAN_FIXED;
236 write_unlock(&chan_list_lock);
241 static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
245 if (conn->hcon->type == LE_LINK)
246 dyn_end = L2CAP_CID_LE_DYN_END;
248 dyn_end = L2CAP_CID_DYN_END;
250 for (cid = L2CAP_CID_DYN_START; cid <= dyn_end; cid++) {
251 if (!__l2cap_get_chan_by_scid(conn, cid))
258 static void l2cap_state_change(struct l2cap_chan *chan, int state)
260 BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state),
261 state_to_string(state));
264 chan->ops->state_change(chan, state, 0);
267 static inline void l2cap_state_change_and_error(struct l2cap_chan *chan,
271 chan->ops->state_change(chan, chan->state, err);
274 static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err)
276 chan->ops->state_change(chan, chan->state, err);
279 static void __set_retrans_timer(struct l2cap_chan *chan)
281 if (!delayed_work_pending(&chan->monitor_timer) &&
282 chan->retrans_timeout) {
283 l2cap_set_timer(chan, &chan->retrans_timer,
284 msecs_to_jiffies(chan->retrans_timeout));
288 static void __set_monitor_timer(struct l2cap_chan *chan)
290 __clear_retrans_timer(chan);
291 if (chan->monitor_timeout) {
292 l2cap_set_timer(chan, &chan->monitor_timer,
293 msecs_to_jiffies(chan->monitor_timeout));
297 static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head,
302 skb_queue_walk(head, skb) {
303 if (bt_cb(skb)->l2cap.txseq == seq)
310 /* ---- L2CAP sequence number lists ---- */
312 /* For ERTM, ordered lists of sequence numbers must be tracked for
313 * SREJ requests that are received and for frames that are to be
314 * retransmitted. These seq_list functions implement a singly-linked
315 * list in an array, where membership in the list can also be checked
316 * in constant time. Items can also be added to the tail of the list
317 * and removed from the head in constant time, without further memory
321 static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size)
323 size_t alloc_size, i;
325 /* Allocated size is a power of 2 to map sequence numbers
326 * (which may be up to 14 bits) in to a smaller array that is
327 * sized for the negotiated ERTM transmit windows.
329 alloc_size = roundup_pow_of_two(size);
331 seq_list->list = kmalloc_array(alloc_size, sizeof(u16), GFP_KERNEL);
335 seq_list->mask = alloc_size - 1;
336 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
337 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
338 for (i = 0; i < alloc_size; i++)
339 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
344 static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list)
346 kfree(seq_list->list);
349 static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list,
352 /* Constant-time check for list membership */
353 return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR;
356 static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list)
358 u16 seq = seq_list->head;
359 u16 mask = seq_list->mask;
361 seq_list->head = seq_list->list[seq & mask];
362 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
364 if (seq_list->head == L2CAP_SEQ_LIST_TAIL) {
365 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
366 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
372 static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list)
376 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR)
379 for (i = 0; i <= seq_list->mask; i++)
380 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
382 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
383 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
386 static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq)
388 u16 mask = seq_list->mask;
390 /* All appends happen in constant time */
392 if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR)
395 if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR)
396 seq_list->head = seq;
398 seq_list->list[seq_list->tail & mask] = seq;
400 seq_list->tail = seq;
401 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL;
404 static void l2cap_chan_timeout(struct work_struct *work)
406 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
408 struct l2cap_conn *conn = chan->conn;
411 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
413 mutex_lock(&conn->chan_lock);
414 l2cap_chan_lock(chan);
416 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
417 reason = ECONNREFUSED;
418 else if (chan->state == BT_CONNECT &&
419 chan->sec_level != BT_SECURITY_SDP)
420 reason = ECONNREFUSED;
424 l2cap_chan_close(chan, reason);
426 l2cap_chan_unlock(chan);
428 chan->ops->close(chan);
429 mutex_unlock(&conn->chan_lock);
431 l2cap_chan_put(chan);
434 struct l2cap_chan *l2cap_chan_create(void)
436 struct l2cap_chan *chan;
438 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
442 mutex_init(&chan->lock);
444 /* Set default lock nesting level */
445 atomic_set(&chan->nesting, L2CAP_NESTING_NORMAL);
447 write_lock(&chan_list_lock);
448 list_add(&chan->global_l, &chan_list);
449 write_unlock(&chan_list_lock);
451 INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
453 chan->state = BT_OPEN;
455 kref_init(&chan->kref);
457 /* This flag is cleared in l2cap_chan_ready() */
458 set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
460 BT_DBG("chan %p", chan);
464 EXPORT_SYMBOL_GPL(l2cap_chan_create);
466 static void l2cap_chan_destroy(struct kref *kref)
468 struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref);
470 BT_DBG("chan %p", chan);
472 write_lock(&chan_list_lock);
473 list_del(&chan->global_l);
474 write_unlock(&chan_list_lock);
479 void l2cap_chan_hold(struct l2cap_chan *c)
481 BT_DBG("chan %p orig refcnt %d", c, kref_read(&c->kref));
486 void l2cap_chan_put(struct l2cap_chan *c)
488 BT_DBG("chan %p orig refcnt %d", c, kref_read(&c->kref));
490 kref_put(&c->kref, l2cap_chan_destroy);
492 EXPORT_SYMBOL_GPL(l2cap_chan_put);
494 void l2cap_chan_set_defaults(struct l2cap_chan *chan)
496 chan->fcs = L2CAP_FCS_CRC16;
497 chan->max_tx = L2CAP_DEFAULT_MAX_TX;
498 chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
499 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
500 chan->remote_max_tx = chan->max_tx;
501 chan->remote_tx_win = chan->tx_win;
502 chan->ack_win = L2CAP_DEFAULT_TX_WINDOW;
503 chan->sec_level = BT_SECURITY_LOW;
504 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
505 chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
506 chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
507 chan->conf_state = 0;
509 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
511 EXPORT_SYMBOL_GPL(l2cap_chan_set_defaults);
513 static void l2cap_le_flowctl_init(struct l2cap_chan *chan)
516 chan->sdu_last_frag = NULL;
518 chan->tx_credits = 0;
519 /* Derive MPS from connection MTU to stop HCI fragmentation */
520 chan->mps = min_t(u16, chan->imtu, chan->conn->mtu - L2CAP_HDR_SIZE);
521 /* Give enough credits for a full packet */
522 chan->rx_credits = (chan->imtu / chan->mps) + 1;
524 skb_queue_head_init(&chan->tx_q);
527 void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
529 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
530 __le16_to_cpu(chan->psm), chan->dcid);
532 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
536 switch (chan->chan_type) {
537 case L2CAP_CHAN_CONN_ORIENTED:
538 /* Alloc CID for connection-oriented socket */
539 chan->scid = l2cap_alloc_cid(conn);
540 if (conn->hcon->type == ACL_LINK)
541 chan->omtu = L2CAP_DEFAULT_MTU;
544 case L2CAP_CHAN_CONN_LESS:
545 /* Connectionless socket */
546 chan->scid = L2CAP_CID_CONN_LESS;
547 chan->dcid = L2CAP_CID_CONN_LESS;
548 chan->omtu = L2CAP_DEFAULT_MTU;
551 case L2CAP_CHAN_FIXED:
552 /* Caller will set CID and CID specific MTU values */
556 /* Raw socket can send/recv signalling messages only */
557 chan->scid = L2CAP_CID_SIGNALING;
558 chan->dcid = L2CAP_CID_SIGNALING;
559 chan->omtu = L2CAP_DEFAULT_MTU;
562 chan->local_id = L2CAP_BESTEFFORT_ID;
563 chan->local_stype = L2CAP_SERV_BESTEFFORT;
564 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
565 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
566 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
567 chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO;
569 l2cap_chan_hold(chan);
571 /* Only keep a reference for fixed channels if they requested it */
572 if (chan->chan_type != L2CAP_CHAN_FIXED ||
573 test_bit(FLAG_HOLD_HCI_CONN, &chan->flags))
574 hci_conn_hold(conn->hcon);
576 list_add(&chan->list, &conn->chan_l);
579 void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
581 mutex_lock(&conn->chan_lock);
582 __l2cap_chan_add(conn, chan);
583 mutex_unlock(&conn->chan_lock);
586 void l2cap_chan_del(struct l2cap_chan *chan, int err)
588 struct l2cap_conn *conn = chan->conn;
590 __clear_chan_timer(chan);
592 BT_DBG("chan %p, conn %p, err %d, state %s", chan, conn, err,
593 state_to_string(chan->state));
595 chan->ops->teardown(chan, err);
598 struct amp_mgr *mgr = conn->hcon->amp_mgr;
599 /* Delete from channel list */
600 list_del(&chan->list);
602 l2cap_chan_put(chan);
606 /* Reference was only held for non-fixed channels or
607 * fixed channels that explicitly requested it using the
608 * FLAG_HOLD_HCI_CONN flag.
610 if (chan->chan_type != L2CAP_CHAN_FIXED ||
611 test_bit(FLAG_HOLD_HCI_CONN, &chan->flags))
612 hci_conn_drop(conn->hcon);
614 if (mgr && mgr->bredr_chan == chan)
615 mgr->bredr_chan = NULL;
618 if (chan->hs_hchan) {
619 struct hci_chan *hs_hchan = chan->hs_hchan;
621 BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan);
622 amp_disconnect_logical_link(hs_hchan);
625 if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
629 case L2CAP_MODE_BASIC:
632 case L2CAP_MODE_LE_FLOWCTL:
633 skb_queue_purge(&chan->tx_q);
636 case L2CAP_MODE_ERTM:
637 __clear_retrans_timer(chan);
638 __clear_monitor_timer(chan);
639 __clear_ack_timer(chan);
641 skb_queue_purge(&chan->srej_q);
643 l2cap_seq_list_free(&chan->srej_list);
644 l2cap_seq_list_free(&chan->retrans_list);
648 case L2CAP_MODE_STREAMING:
649 skb_queue_purge(&chan->tx_q);
655 EXPORT_SYMBOL_GPL(l2cap_chan_del);
657 static void l2cap_conn_update_id_addr(struct work_struct *work)
659 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
660 id_addr_update_work);
661 struct hci_conn *hcon = conn->hcon;
662 struct l2cap_chan *chan;
664 mutex_lock(&conn->chan_lock);
666 list_for_each_entry(chan, &conn->chan_l, list) {
667 l2cap_chan_lock(chan);
668 bacpy(&chan->dst, &hcon->dst);
669 chan->dst_type = bdaddr_dst_type(hcon);
670 l2cap_chan_unlock(chan);
673 mutex_unlock(&conn->chan_lock);
676 static void l2cap_chan_le_connect_reject(struct l2cap_chan *chan)
678 struct l2cap_conn *conn = chan->conn;
679 struct l2cap_le_conn_rsp rsp;
682 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
683 result = L2CAP_CR_AUTHORIZATION;
685 result = L2CAP_CR_BAD_PSM;
687 l2cap_state_change(chan, BT_DISCONN);
689 rsp.dcid = cpu_to_le16(chan->scid);
690 rsp.mtu = cpu_to_le16(chan->imtu);
691 rsp.mps = cpu_to_le16(chan->mps);
692 rsp.credits = cpu_to_le16(chan->rx_credits);
693 rsp.result = cpu_to_le16(result);
695 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
699 static void l2cap_chan_connect_reject(struct l2cap_chan *chan)
701 struct l2cap_conn *conn = chan->conn;
702 struct l2cap_conn_rsp rsp;
705 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
706 result = L2CAP_CR_SEC_BLOCK;
708 result = L2CAP_CR_BAD_PSM;
710 l2cap_state_change(chan, BT_DISCONN);
712 rsp.scid = cpu_to_le16(chan->dcid);
713 rsp.dcid = cpu_to_le16(chan->scid);
714 rsp.result = cpu_to_le16(result);
715 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
717 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
720 void l2cap_chan_close(struct l2cap_chan *chan, int reason)
722 struct l2cap_conn *conn = chan->conn;
724 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
726 switch (chan->state) {
728 chan->ops->teardown(chan, 0);
733 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
734 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
735 l2cap_send_disconn_req(chan, reason);
737 l2cap_chan_del(chan, reason);
741 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
742 if (conn->hcon->type == ACL_LINK)
743 l2cap_chan_connect_reject(chan);
744 else if (conn->hcon->type == LE_LINK)
745 l2cap_chan_le_connect_reject(chan);
748 l2cap_chan_del(chan, reason);
753 l2cap_chan_del(chan, reason);
757 chan->ops->teardown(chan, 0);
761 EXPORT_SYMBOL(l2cap_chan_close);
763 static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
765 switch (chan->chan_type) {
767 switch (chan->sec_level) {
768 case BT_SECURITY_HIGH:
769 case BT_SECURITY_FIPS:
770 return HCI_AT_DEDICATED_BONDING_MITM;
771 case BT_SECURITY_MEDIUM:
772 return HCI_AT_DEDICATED_BONDING;
774 return HCI_AT_NO_BONDING;
777 case L2CAP_CHAN_CONN_LESS:
778 if (chan->psm == cpu_to_le16(L2CAP_PSM_3DSP)) {
779 if (chan->sec_level == BT_SECURITY_LOW)
780 chan->sec_level = BT_SECURITY_SDP;
782 if (chan->sec_level == BT_SECURITY_HIGH ||
783 chan->sec_level == BT_SECURITY_FIPS)
784 return HCI_AT_NO_BONDING_MITM;
786 return HCI_AT_NO_BONDING;
788 case L2CAP_CHAN_CONN_ORIENTED:
789 if (chan->psm == cpu_to_le16(L2CAP_PSM_SDP)) {
790 if (chan->sec_level == BT_SECURITY_LOW)
791 chan->sec_level = BT_SECURITY_SDP;
793 if (chan->sec_level == BT_SECURITY_HIGH ||
794 chan->sec_level == BT_SECURITY_FIPS)
795 return HCI_AT_NO_BONDING_MITM;
797 return HCI_AT_NO_BONDING;
801 switch (chan->sec_level) {
802 case BT_SECURITY_HIGH:
803 case BT_SECURITY_FIPS:
804 return HCI_AT_GENERAL_BONDING_MITM;
805 case BT_SECURITY_MEDIUM:
806 return HCI_AT_GENERAL_BONDING;
808 return HCI_AT_NO_BONDING;
814 /* Service level security */
815 int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator)
817 struct l2cap_conn *conn = chan->conn;
820 if (conn->hcon->type == LE_LINK)
821 return smp_conn_security(conn->hcon, chan->sec_level);
823 auth_type = l2cap_get_auth_type(chan);
825 return hci_conn_security(conn->hcon, chan->sec_level, auth_type,
829 static u8 l2cap_get_ident(struct l2cap_conn *conn)
833 /* Get next available identificator.
834 * 1 - 128 are used by kernel.
835 * 129 - 199 are reserved.
836 * 200 - 254 are used by utilities like l2ping, etc.
839 mutex_lock(&conn->ident_lock);
841 if (++conn->tx_ident > 128)
846 mutex_unlock(&conn->ident_lock);
851 static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
854 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
857 BT_DBG("code 0x%2.2x", code);
862 /* Use NO_FLUSH if supported or we have an LE link (which does
863 * not support auto-flushing packets) */
864 if (lmp_no_flush_capable(conn->hcon->hdev) ||
865 conn->hcon->type == LE_LINK)
866 flags = ACL_START_NO_FLUSH;
870 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
871 skb->priority = HCI_PRIO_MAX;
873 hci_send_acl(conn->hchan, skb, flags);
876 static bool __chan_is_moving(struct l2cap_chan *chan)
878 return chan->move_state != L2CAP_MOVE_STABLE &&
879 chan->move_state != L2CAP_MOVE_WAIT_PREPARE;
882 static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
884 struct hci_conn *hcon = chan->conn->hcon;
887 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
890 if (chan->hs_hcon && !__chan_is_moving(chan)) {
892 hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE);
899 /* Use NO_FLUSH for LE links (where this is the only option) or
900 * if the BR/EDR link supports it and flushing has not been
901 * explicitly requested (through FLAG_FLUSHABLE).
903 if (hcon->type == LE_LINK ||
904 (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
905 lmp_no_flush_capable(hcon->hdev)))
906 flags = ACL_START_NO_FLUSH;
910 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
911 hci_send_acl(chan->conn->hchan, skb, flags);
914 static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
916 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
917 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
919 if (enh & L2CAP_CTRL_FRAME_TYPE) {
922 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
923 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
930 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
931 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
938 static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
940 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
941 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
943 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
946 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
947 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
954 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
955 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
962 static inline void __unpack_control(struct l2cap_chan *chan,
965 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
966 __unpack_extended_control(get_unaligned_le32(skb->data),
968 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
970 __unpack_enhanced_control(get_unaligned_le16(skb->data),
972 skb_pull(skb, L2CAP_ENH_CTRL_SIZE);
976 static u32 __pack_extended_control(struct l2cap_ctrl *control)
980 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
981 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
983 if (control->sframe) {
984 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
985 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
986 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
988 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
989 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
995 static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
999 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
1000 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
1002 if (control->sframe) {
1003 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
1004 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
1005 packed |= L2CAP_CTRL_FRAME_TYPE;
1007 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
1008 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
1014 static inline void __pack_control(struct l2cap_chan *chan,
1015 struct l2cap_ctrl *control,
1016 struct sk_buff *skb)
1018 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
1019 put_unaligned_le32(__pack_extended_control(control),
1020 skb->data + L2CAP_HDR_SIZE);
1022 put_unaligned_le16(__pack_enhanced_control(control),
1023 skb->data + L2CAP_HDR_SIZE);
1027 static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan)
1029 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1030 return L2CAP_EXT_HDR_SIZE;
1032 return L2CAP_ENH_HDR_SIZE;
1035 static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
1038 struct sk_buff *skb;
1039 struct l2cap_hdr *lh;
1040 int hlen = __ertm_hdr_size(chan);
1042 if (chan->fcs == L2CAP_FCS_CRC16)
1043 hlen += L2CAP_FCS_SIZE;
1045 skb = bt_skb_alloc(hlen, GFP_KERNEL);
1048 return ERR_PTR(-ENOMEM);
1050 lh = skb_put(skb, L2CAP_HDR_SIZE);
1051 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
1052 lh->cid = cpu_to_le16(chan->dcid);
1054 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1055 put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
1057 put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
1059 if (chan->fcs == L2CAP_FCS_CRC16) {
1060 u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
1061 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
1064 skb->priority = HCI_PRIO_MAX;
1068 static void l2cap_send_sframe(struct l2cap_chan *chan,
1069 struct l2cap_ctrl *control)
1071 struct sk_buff *skb;
1074 BT_DBG("chan %p, control %p", chan, control);
1076 if (!control->sframe)
1079 if (__chan_is_moving(chan))
1082 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) &&
1086 if (control->super == L2CAP_SUPER_RR)
1087 clear_bit(CONN_RNR_SENT, &chan->conn_state);
1088 else if (control->super == L2CAP_SUPER_RNR)
1089 set_bit(CONN_RNR_SENT, &chan->conn_state);
1091 if (control->super != L2CAP_SUPER_SREJ) {
1092 chan->last_acked_seq = control->reqseq;
1093 __clear_ack_timer(chan);
1096 BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq,
1097 control->final, control->poll, control->super);
1099 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1100 control_field = __pack_extended_control(control);
1102 control_field = __pack_enhanced_control(control);
1104 skb = l2cap_create_sframe_pdu(chan, control_field);
1106 l2cap_do_send(chan, skb);
1109 static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll)
1111 struct l2cap_ctrl control;
1113 BT_DBG("chan %p, poll %d", chan, poll);
1115 memset(&control, 0, sizeof(control));
1117 control.poll = poll;
1119 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
1120 control.super = L2CAP_SUPER_RNR;
1122 control.super = L2CAP_SUPER_RR;
1124 control.reqseq = chan->buffer_seq;
1125 l2cap_send_sframe(chan, &control);
1128 static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
1130 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
1133 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
1136 static bool __amp_capable(struct l2cap_chan *chan)
1138 struct l2cap_conn *conn = chan->conn;
1139 struct hci_dev *hdev;
1140 bool amp_available = false;
1142 if (!(conn->local_fixed_chan & L2CAP_FC_A2MP))
1145 if (!(conn->remote_fixed_chan & L2CAP_FC_A2MP))
1148 read_lock(&hci_dev_list_lock);
1149 list_for_each_entry(hdev, &hci_dev_list, list) {
1150 if (hdev->amp_type != AMP_TYPE_BREDR &&
1151 test_bit(HCI_UP, &hdev->flags)) {
1152 amp_available = true;
1156 read_unlock(&hci_dev_list_lock);
1158 if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED)
1159 return amp_available;
1164 static bool l2cap_check_efs(struct l2cap_chan *chan)
1166 /* Check EFS parameters */
1170 void l2cap_send_conn_req(struct l2cap_chan *chan)
1172 struct l2cap_conn *conn = chan->conn;
1173 struct l2cap_conn_req req;
1175 req.scid = cpu_to_le16(chan->scid);
1176 req.psm = chan->psm;
1178 chan->ident = l2cap_get_ident(conn);
1180 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1182 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
1185 static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id)
1187 struct l2cap_create_chan_req req;
1188 req.scid = cpu_to_le16(chan->scid);
1189 req.psm = chan->psm;
1190 req.amp_id = amp_id;
1192 chan->ident = l2cap_get_ident(chan->conn);
1194 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ,
1198 static void l2cap_move_setup(struct l2cap_chan *chan)
1200 struct sk_buff *skb;
1202 BT_DBG("chan %p", chan);
1204 if (chan->mode != L2CAP_MODE_ERTM)
1207 __clear_retrans_timer(chan);
1208 __clear_monitor_timer(chan);
1209 __clear_ack_timer(chan);
1211 chan->retry_count = 0;
1212 skb_queue_walk(&chan->tx_q, skb) {
1213 if (bt_cb(skb)->l2cap.retries)
1214 bt_cb(skb)->l2cap.retries = 1;
1219 chan->expected_tx_seq = chan->buffer_seq;
1221 clear_bit(CONN_REJ_ACT, &chan->conn_state);
1222 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
1223 l2cap_seq_list_clear(&chan->retrans_list);
1224 l2cap_seq_list_clear(&chan->srej_list);
1225 skb_queue_purge(&chan->srej_q);
1227 chan->tx_state = L2CAP_TX_STATE_XMIT;
1228 chan->rx_state = L2CAP_RX_STATE_MOVE;
1230 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
1233 static void l2cap_move_done(struct l2cap_chan *chan)
1235 u8 move_role = chan->move_role;
1236 BT_DBG("chan %p", chan);
1238 chan->move_state = L2CAP_MOVE_STABLE;
1239 chan->move_role = L2CAP_MOVE_ROLE_NONE;
1241 if (chan->mode != L2CAP_MODE_ERTM)
1244 switch (move_role) {
1245 case L2CAP_MOVE_ROLE_INITIATOR:
1246 l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
1247 chan->rx_state = L2CAP_RX_STATE_WAIT_F;
1249 case L2CAP_MOVE_ROLE_RESPONDER:
1250 chan->rx_state = L2CAP_RX_STATE_WAIT_P;
1255 static void l2cap_chan_ready(struct l2cap_chan *chan)
1257 /* The channel may have already been flagged as connected in
1258 * case of receiving data before the L2CAP info req/rsp
1259 * procedure is complete.
1261 if (chan->state == BT_CONNECTED)
1264 /* This clears all conf flags, including CONF_NOT_COMPLETE */
1265 chan->conf_state = 0;
1266 __clear_chan_timer(chan);
1268 if (chan->mode == L2CAP_MODE_LE_FLOWCTL && !chan->tx_credits)
1269 chan->ops->suspend(chan);
1271 chan->state = BT_CONNECTED;
1273 chan->ops->ready(chan);
1276 static void l2cap_le_connect(struct l2cap_chan *chan)
1278 struct l2cap_conn *conn = chan->conn;
1279 struct l2cap_le_conn_req req;
1281 if (test_and_set_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags))
1284 l2cap_le_flowctl_init(chan);
1286 req.psm = chan->psm;
1287 req.scid = cpu_to_le16(chan->scid);
1288 req.mtu = cpu_to_le16(chan->imtu);
1289 req.mps = cpu_to_le16(chan->mps);
1290 req.credits = cpu_to_le16(chan->rx_credits);
1292 chan->ident = l2cap_get_ident(conn);
1294 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_REQ,
1298 static void l2cap_le_start(struct l2cap_chan *chan)
1300 struct l2cap_conn *conn = chan->conn;
1302 if (!smp_conn_security(conn->hcon, chan->sec_level))
1306 l2cap_chan_ready(chan);
1310 if (chan->state == BT_CONNECT)
1311 l2cap_le_connect(chan);
1314 static void l2cap_start_connection(struct l2cap_chan *chan)
1316 if (__amp_capable(chan)) {
1317 BT_DBG("chan %p AMP capable: discover AMPs", chan);
1318 a2mp_discover_amp(chan);
1319 } else if (chan->conn->hcon->type == LE_LINK) {
1320 l2cap_le_start(chan);
1322 l2cap_send_conn_req(chan);
1326 static void l2cap_request_info(struct l2cap_conn *conn)
1328 struct l2cap_info_req req;
1330 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
1333 req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
1335 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1336 conn->info_ident = l2cap_get_ident(conn);
1338 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
1340 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
1344 static void l2cap_do_start(struct l2cap_chan *chan)
1346 struct l2cap_conn *conn = chan->conn;
1348 if (conn->hcon->type == LE_LINK) {
1349 l2cap_le_start(chan);
1353 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)) {
1354 l2cap_request_info(conn);
1358 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1361 if (l2cap_chan_check_security(chan, true) &&
1362 __l2cap_no_conn_pending(chan))
1363 l2cap_start_connection(chan);
1366 static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1368 u32 local_feat_mask = l2cap_feat_mask;
1370 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1373 case L2CAP_MODE_ERTM:
1374 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1375 case L2CAP_MODE_STREAMING:
1376 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1382 static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err)
1384 struct l2cap_conn *conn = chan->conn;
1385 struct l2cap_disconn_req req;
1390 if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) {
1391 __clear_retrans_timer(chan);
1392 __clear_monitor_timer(chan);
1393 __clear_ack_timer(chan);
1396 if (chan->scid == L2CAP_CID_A2MP) {
1397 l2cap_state_change(chan, BT_DISCONN);
1401 req.dcid = cpu_to_le16(chan->dcid);
1402 req.scid = cpu_to_le16(chan->scid);
1403 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ,
1406 l2cap_state_change_and_error(chan, BT_DISCONN, err);
1409 /* ---- L2CAP connections ---- */
1410 static void l2cap_conn_start(struct l2cap_conn *conn)
1412 struct l2cap_chan *chan, *tmp;
1414 BT_DBG("conn %p", conn);
1416 mutex_lock(&conn->chan_lock);
1418 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
1419 l2cap_chan_lock(chan);
1421 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
1422 l2cap_chan_ready(chan);
1423 l2cap_chan_unlock(chan);
1427 if (chan->state == BT_CONNECT) {
1428 if (!l2cap_chan_check_security(chan, true) ||
1429 !__l2cap_no_conn_pending(chan)) {
1430 l2cap_chan_unlock(chan);
1434 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
1435 && test_bit(CONF_STATE2_DEVICE,
1436 &chan->conf_state)) {
1437 l2cap_chan_close(chan, ECONNRESET);
1438 l2cap_chan_unlock(chan);
1442 l2cap_start_connection(chan);
1444 } else if (chan->state == BT_CONNECT2) {
1445 struct l2cap_conn_rsp rsp;
1447 rsp.scid = cpu_to_le16(chan->dcid);
1448 rsp.dcid = cpu_to_le16(chan->scid);
1450 if (l2cap_chan_check_security(chan, false)) {
1451 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
1452 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1453 rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
1454 chan->ops->defer(chan);
1457 l2cap_state_change(chan, BT_CONFIG);
1458 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
1459 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
1462 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1463 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
1466 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
1469 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
1470 rsp.result != L2CAP_CR_SUCCESS) {
1471 l2cap_chan_unlock(chan);
1475 set_bit(CONF_REQ_SENT, &chan->conf_state);
1476 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
1477 l2cap_build_conf_req(chan, buf, sizeof(buf)), buf);
1478 chan->num_conf_req++;
1481 l2cap_chan_unlock(chan);
1484 mutex_unlock(&conn->chan_lock);
1487 static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1489 struct hci_conn *hcon = conn->hcon;
1490 struct hci_dev *hdev = hcon->hdev;
1492 BT_DBG("%s conn %p", hdev->name, conn);
1494 /* For outgoing pairing which doesn't necessarily have an
1495 * associated socket (e.g. mgmt_pair_device).
1498 smp_conn_security(hcon, hcon->pending_sec_level);
1500 /* For LE slave connections, make sure the connection interval
1501 * is in the range of the minium and maximum interval that has
1502 * been configured for this connection. If not, then trigger
1503 * the connection update procedure.
1505 if (hcon->role == HCI_ROLE_SLAVE &&
1506 (hcon->le_conn_interval < hcon->le_conn_min_interval ||
1507 hcon->le_conn_interval > hcon->le_conn_max_interval)) {
1508 struct l2cap_conn_param_update_req req;
1510 req.min = cpu_to_le16(hcon->le_conn_min_interval);
1511 req.max = cpu_to_le16(hcon->le_conn_max_interval);
1512 req.latency = cpu_to_le16(hcon->le_conn_latency);
1513 req.to_multiplier = cpu_to_le16(hcon->le_supv_timeout);
1515 l2cap_send_cmd(conn, l2cap_get_ident(conn),
1516 L2CAP_CONN_PARAM_UPDATE_REQ, sizeof(req), &req);
1520 static void l2cap_conn_ready(struct l2cap_conn *conn)
1522 struct l2cap_chan *chan;
1523 struct hci_conn *hcon = conn->hcon;
1525 BT_DBG("conn %p", conn);
1527 if (hcon->type == ACL_LINK)
1528 l2cap_request_info(conn);
1530 mutex_lock(&conn->chan_lock);
1532 list_for_each_entry(chan, &conn->chan_l, list) {
1534 l2cap_chan_lock(chan);
1536 if (chan->scid == L2CAP_CID_A2MP) {
1537 l2cap_chan_unlock(chan);
1541 if (hcon->type == LE_LINK) {
1542 l2cap_le_start(chan);
1543 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
1544 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
1545 l2cap_chan_ready(chan);
1546 } else if (chan->state == BT_CONNECT) {
1547 l2cap_do_start(chan);
1550 l2cap_chan_unlock(chan);
1553 mutex_unlock(&conn->chan_lock);
1555 if (hcon->type == LE_LINK)
1556 l2cap_le_conn_ready(conn);
1558 queue_work(hcon->hdev->workqueue, &conn->pending_rx_work);
1561 /* Notify sockets that we cannot guaranty reliability anymore */
1562 static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1564 struct l2cap_chan *chan;
1566 BT_DBG("conn %p", conn);
1568 mutex_lock(&conn->chan_lock);
1570 list_for_each_entry(chan, &conn->chan_l, list) {
1571 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
1572 l2cap_chan_set_err(chan, err);
1575 mutex_unlock(&conn->chan_lock);
1578 static void l2cap_info_timeout(struct work_struct *work)
1580 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
1583 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
1584 conn->info_ident = 0;
1586 l2cap_conn_start(conn);
1591 * External modules can register l2cap_user objects on l2cap_conn. The ->probe
1592 * callback is called during registration. The ->remove callback is called
1593 * during unregistration.
1594 * An l2cap_user object can either be explicitly unregistered or when the
1595 * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon,
1596 * l2cap->hchan, .. are valid as long as the remove callback hasn't been called.
1597 * External modules must own a reference to the l2cap_conn object if they intend
1598 * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at
1599 * any time if they don't.
1602 int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user)
1604 struct hci_dev *hdev = conn->hcon->hdev;
1607 /* We need to check whether l2cap_conn is registered. If it is not, we
1608 * must not register the l2cap_user. l2cap_conn_del() is unregisters
1609 * l2cap_conn objects, but doesn't provide its own locking. Instead, it
1610 * relies on the parent hci_conn object to be locked. This itself relies
1611 * on the hci_dev object to be locked. So we must lock the hci device
1616 if (!list_empty(&user->list)) {
1621 /* conn->hchan is NULL after l2cap_conn_del() was called */
1627 ret = user->probe(conn, user);
1631 list_add(&user->list, &conn->users);
1635 hci_dev_unlock(hdev);
1638 EXPORT_SYMBOL(l2cap_register_user);
1640 void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user)
1642 struct hci_dev *hdev = conn->hcon->hdev;
1646 if (list_empty(&user->list))
1649 list_del_init(&user->list);
1650 user->remove(conn, user);
1653 hci_dev_unlock(hdev);
1655 EXPORT_SYMBOL(l2cap_unregister_user);
1657 static void l2cap_unregister_all_users(struct l2cap_conn *conn)
1659 struct l2cap_user *user;
1661 while (!list_empty(&conn->users)) {
1662 user = list_first_entry(&conn->users, struct l2cap_user, list);
1663 list_del_init(&user->list);
1664 user->remove(conn, user);
1668 static void l2cap_conn_del(struct hci_conn *hcon, int err)
1670 struct l2cap_conn *conn = hcon->l2cap_data;
1671 struct l2cap_chan *chan, *l;
1676 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1678 kfree_skb(conn->rx_skb);
1680 skb_queue_purge(&conn->pending_rx);
1682 /* We can not call flush_work(&conn->pending_rx_work) here since we
1683 * might block if we are running on a worker from the same workqueue
1684 * pending_rx_work is waiting on.
1686 if (work_pending(&conn->pending_rx_work))
1687 cancel_work_sync(&conn->pending_rx_work);
1689 if (work_pending(&conn->id_addr_update_work))
1690 cancel_work_sync(&conn->id_addr_update_work);
1692 l2cap_unregister_all_users(conn);
1694 /* Force the connection to be immediately dropped */
1695 hcon->disc_timeout = 0;
1697 mutex_lock(&conn->chan_lock);
1700 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
1701 l2cap_chan_hold(chan);
1702 l2cap_chan_lock(chan);
1704 l2cap_chan_del(chan, err);
1706 l2cap_chan_unlock(chan);
1708 chan->ops->close(chan);
1709 l2cap_chan_put(chan);
1712 mutex_unlock(&conn->chan_lock);
1714 hci_chan_del(conn->hchan);
1716 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
1717 cancel_delayed_work_sync(&conn->info_timer);
1719 hcon->l2cap_data = NULL;
1721 l2cap_conn_put(conn);
1724 static void l2cap_conn_free(struct kref *ref)
1726 struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref);
1728 hci_conn_put(conn->hcon);
1732 struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn)
1734 kref_get(&conn->ref);
1737 EXPORT_SYMBOL(l2cap_conn_get);
1739 void l2cap_conn_put(struct l2cap_conn *conn)
1741 kref_put(&conn->ref, l2cap_conn_free);
1743 EXPORT_SYMBOL(l2cap_conn_put);
1745 /* ---- Socket interface ---- */
1747 /* Find socket with psm and source / destination bdaddr.
1748 * Returns closest match.
1750 static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1755 struct l2cap_chan *c, *c1 = NULL;
1757 read_lock(&chan_list_lock);
1759 list_for_each_entry(c, &chan_list, global_l) {
1760 if (state && c->state != state)
1763 if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR)
1766 if (link_type == LE_LINK && c->src_type == BDADDR_BREDR)
1769 if (c->psm == psm) {
1770 int src_match, dst_match;
1771 int src_any, dst_any;
1774 src_match = !bacmp(&c->src, src);
1775 dst_match = !bacmp(&c->dst, dst);
1776 if (src_match && dst_match) {
1778 read_unlock(&chan_list_lock);
1783 src_any = !bacmp(&c->src, BDADDR_ANY);
1784 dst_any = !bacmp(&c->dst, BDADDR_ANY);
1785 if ((src_match && dst_any) || (src_any && dst_match) ||
1786 (src_any && dst_any))
1792 l2cap_chan_hold(c1);
1794 read_unlock(&chan_list_lock);
1799 static void l2cap_monitor_timeout(struct work_struct *work)
1801 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
1802 monitor_timer.work);
1804 BT_DBG("chan %p", chan);
1806 l2cap_chan_lock(chan);
1809 l2cap_chan_unlock(chan);
1810 l2cap_chan_put(chan);
1814 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
1816 l2cap_chan_unlock(chan);
1817 l2cap_chan_put(chan);
1820 static void l2cap_retrans_timeout(struct work_struct *work)
1822 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
1823 retrans_timer.work);
1825 BT_DBG("chan %p", chan);
1827 l2cap_chan_lock(chan);
1830 l2cap_chan_unlock(chan);
1831 l2cap_chan_put(chan);
1835 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
1836 l2cap_chan_unlock(chan);
1837 l2cap_chan_put(chan);
1840 static void l2cap_streaming_send(struct l2cap_chan *chan,
1841 struct sk_buff_head *skbs)
1843 struct sk_buff *skb;
1844 struct l2cap_ctrl *control;
1846 BT_DBG("chan %p, skbs %p", chan, skbs);
1848 if (__chan_is_moving(chan))
1851 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1853 while (!skb_queue_empty(&chan->tx_q)) {
1855 skb = skb_dequeue(&chan->tx_q);
1857 bt_cb(skb)->l2cap.retries = 1;
1858 control = &bt_cb(skb)->l2cap;
1860 control->reqseq = 0;
1861 control->txseq = chan->next_tx_seq;
1863 __pack_control(chan, control, skb);
1865 if (chan->fcs == L2CAP_FCS_CRC16) {
1866 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1867 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
1870 l2cap_do_send(chan, skb);
1872 BT_DBG("Sent txseq %u", control->txseq);
1874 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
1875 chan->frames_sent++;
1879 static int l2cap_ertm_send(struct l2cap_chan *chan)
1881 struct sk_buff *skb, *tx_skb;
1882 struct l2cap_ctrl *control;
1885 BT_DBG("chan %p", chan);
1887 if (chan->state != BT_CONNECTED)
1890 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1893 if (__chan_is_moving(chan))
1896 while (chan->tx_send_head &&
1897 chan->unacked_frames < chan->remote_tx_win &&
1898 chan->tx_state == L2CAP_TX_STATE_XMIT) {
1900 skb = chan->tx_send_head;
1902 bt_cb(skb)->l2cap.retries = 1;
1903 control = &bt_cb(skb)->l2cap;
1905 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1908 control->reqseq = chan->buffer_seq;
1909 chan->last_acked_seq = chan->buffer_seq;
1910 control->txseq = chan->next_tx_seq;
1912 __pack_control(chan, control, skb);
1914 if (chan->fcs == L2CAP_FCS_CRC16) {
1915 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1916 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
1919 /* Clone after data has been modified. Data is assumed to be
1920 read-only (for locking purposes) on cloned sk_buffs.
1922 tx_skb = skb_clone(skb, GFP_KERNEL);
1927 __set_retrans_timer(chan);
1929 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
1930 chan->unacked_frames++;
1931 chan->frames_sent++;
1934 if (skb_queue_is_last(&chan->tx_q, skb))
1935 chan->tx_send_head = NULL;
1937 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
1939 l2cap_do_send(chan, tx_skb);
1940 BT_DBG("Sent txseq %u", control->txseq);
1943 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
1944 chan->unacked_frames, skb_queue_len(&chan->tx_q));
1949 static void l2cap_ertm_resend(struct l2cap_chan *chan)
1951 struct l2cap_ctrl control;
1952 struct sk_buff *skb;
1953 struct sk_buff *tx_skb;
1956 BT_DBG("chan %p", chan);
1958 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1961 if (__chan_is_moving(chan))
1964 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
1965 seq = l2cap_seq_list_pop(&chan->retrans_list);
1967 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
1969 BT_DBG("Error: Can't retransmit seq %d, frame missing",
1974 bt_cb(skb)->l2cap.retries++;
1975 control = bt_cb(skb)->l2cap;
1977 if (chan->max_tx != 0 &&
1978 bt_cb(skb)->l2cap.retries > chan->max_tx) {
1979 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
1980 l2cap_send_disconn_req(chan, ECONNRESET);
1981 l2cap_seq_list_clear(&chan->retrans_list);
1985 control.reqseq = chan->buffer_seq;
1986 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1991 if (skb_cloned(skb)) {
1992 /* Cloned sk_buffs are read-only, so we need a
1995 tx_skb = skb_copy(skb, GFP_KERNEL);
1997 tx_skb = skb_clone(skb, GFP_KERNEL);
2001 l2cap_seq_list_clear(&chan->retrans_list);
2005 /* Update skb contents */
2006 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
2007 put_unaligned_le32(__pack_extended_control(&control),
2008 tx_skb->data + L2CAP_HDR_SIZE);
2010 put_unaligned_le16(__pack_enhanced_control(&control),
2011 tx_skb->data + L2CAP_HDR_SIZE);
2015 if (chan->fcs == L2CAP_FCS_CRC16) {
2016 u16 fcs = crc16(0, (u8 *) tx_skb->data,
2017 tx_skb->len - L2CAP_FCS_SIZE);
2018 put_unaligned_le16(fcs, skb_tail_pointer(tx_skb) -
2022 l2cap_do_send(chan, tx_skb);
2024 BT_DBG("Resent txseq %d", control.txseq);
2026 chan->last_acked_seq = chan->buffer_seq;
2030 static void l2cap_retransmit(struct l2cap_chan *chan,
2031 struct l2cap_ctrl *control)
2033 BT_DBG("chan %p, control %p", chan, control);
2035 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
2036 l2cap_ertm_resend(chan);
2039 static void l2cap_retransmit_all(struct l2cap_chan *chan,
2040 struct l2cap_ctrl *control)
2042 struct sk_buff *skb;
2044 BT_DBG("chan %p, control %p", chan, control);
2047 set_bit(CONN_SEND_FBIT, &chan->conn_state);
2049 l2cap_seq_list_clear(&chan->retrans_list);
2051 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2054 if (chan->unacked_frames) {
2055 skb_queue_walk(&chan->tx_q, skb) {
2056 if (bt_cb(skb)->l2cap.txseq == control->reqseq ||
2057 skb == chan->tx_send_head)
2061 skb_queue_walk_from(&chan->tx_q, skb) {
2062 if (skb == chan->tx_send_head)
2065 l2cap_seq_list_append(&chan->retrans_list,
2066 bt_cb(skb)->l2cap.txseq);
2069 l2cap_ertm_resend(chan);
2073 static void l2cap_send_ack(struct l2cap_chan *chan)
2075 struct l2cap_ctrl control;
2076 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2077 chan->last_acked_seq);
2080 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
2081 chan, chan->last_acked_seq, chan->buffer_seq);
2083 memset(&control, 0, sizeof(control));
2086 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
2087 chan->rx_state == L2CAP_RX_STATE_RECV) {
2088 __clear_ack_timer(chan);
2089 control.super = L2CAP_SUPER_RNR;
2090 control.reqseq = chan->buffer_seq;
2091 l2cap_send_sframe(chan, &control);
2093 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
2094 l2cap_ertm_send(chan);
2095 /* If any i-frames were sent, they included an ack */
2096 if (chan->buffer_seq == chan->last_acked_seq)
2100 /* Ack now if the window is 3/4ths full.
2101 * Calculate without mul or div
2103 threshold = chan->ack_win;
2104 threshold += threshold << 1;
2107 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
2110 if (frames_to_ack >= threshold) {
2111 __clear_ack_timer(chan);
2112 control.super = L2CAP_SUPER_RR;
2113 control.reqseq = chan->buffer_seq;
2114 l2cap_send_sframe(chan, &control);
2119 __set_ack_timer(chan);
2123 static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
2124 struct msghdr *msg, int len,
2125 int count, struct sk_buff *skb)
2127 struct l2cap_conn *conn = chan->conn;
2128 struct sk_buff **frag;
2131 if (!copy_from_iter_full(skb_put(skb, count), count, &msg->msg_iter))
2137 /* Continuation fragments (no L2CAP header) */
2138 frag = &skb_shinfo(skb)->frag_list;
2140 struct sk_buff *tmp;
2142 count = min_t(unsigned int, conn->mtu, len);
2144 tmp = chan->ops->alloc_skb(chan, 0, count,
2145 msg->msg_flags & MSG_DONTWAIT);
2147 return PTR_ERR(tmp);
2151 if (!copy_from_iter_full(skb_put(*frag, count), count,
2158 skb->len += (*frag)->len;
2159 skb->data_len += (*frag)->len;
2161 frag = &(*frag)->next;
2167 static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
2168 struct msghdr *msg, size_t len)
2170 struct l2cap_conn *conn = chan->conn;
2171 struct sk_buff *skb;
2172 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
2173 struct l2cap_hdr *lh;
2175 BT_DBG("chan %p psm 0x%2.2x len %zu", chan,
2176 __le16_to_cpu(chan->psm), len);
2178 count = min_t(unsigned int, (conn->mtu - hlen), len);
2180 skb = chan->ops->alloc_skb(chan, hlen, count,
2181 msg->msg_flags & MSG_DONTWAIT);
2185 /* Create L2CAP header */
2186 lh = skb_put(skb, L2CAP_HDR_SIZE);
2187 lh->cid = cpu_to_le16(chan->dcid);
2188 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
2189 put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE));
2191 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2192 if (unlikely(err < 0)) {
2194 return ERR_PTR(err);
2199 static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
2200 struct msghdr *msg, size_t len)
2202 struct l2cap_conn *conn = chan->conn;
2203 struct sk_buff *skb;
2205 struct l2cap_hdr *lh;
2207 BT_DBG("chan %p len %zu", chan, len);
2209 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2211 skb = chan->ops->alloc_skb(chan, L2CAP_HDR_SIZE, count,
2212 msg->msg_flags & MSG_DONTWAIT);
2216 /* Create L2CAP header */
2217 lh = skb_put(skb, L2CAP_HDR_SIZE);
2218 lh->cid = cpu_to_le16(chan->dcid);
2219 lh->len = cpu_to_le16(len);
2221 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2222 if (unlikely(err < 0)) {
2224 return ERR_PTR(err);
2229 static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
2230 struct msghdr *msg, size_t len,
2233 struct l2cap_conn *conn = chan->conn;
2234 struct sk_buff *skb;
2235 int err, count, hlen;
2236 struct l2cap_hdr *lh;
2238 BT_DBG("chan %p len %zu", chan, len);
2241 return ERR_PTR(-ENOTCONN);
2243 hlen = __ertm_hdr_size(chan);
2246 hlen += L2CAP_SDULEN_SIZE;
2248 if (chan->fcs == L2CAP_FCS_CRC16)
2249 hlen += L2CAP_FCS_SIZE;
2251 count = min_t(unsigned int, (conn->mtu - hlen), len);
2253 skb = chan->ops->alloc_skb(chan, hlen, count,
2254 msg->msg_flags & MSG_DONTWAIT);
2258 /* Create L2CAP header */
2259 lh = skb_put(skb, L2CAP_HDR_SIZE);
2260 lh->cid = cpu_to_le16(chan->dcid);
2261 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
2263 /* Control header is populated later */
2264 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2265 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2267 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
2270 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
2272 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2273 if (unlikely(err < 0)) {
2275 return ERR_PTR(err);
2278 bt_cb(skb)->l2cap.fcs = chan->fcs;
2279 bt_cb(skb)->l2cap.retries = 0;
2283 static int l2cap_segment_sdu(struct l2cap_chan *chan,
2284 struct sk_buff_head *seg_queue,
2285 struct msghdr *msg, size_t len)
2287 struct sk_buff *skb;
2292 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
2294 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2295 * so fragmented skbs are not used. The HCI layer's handling
2296 * of fragmented skbs is not compatible with ERTM's queueing.
2299 /* PDU size is derived from the HCI MTU */
2300 pdu_len = chan->conn->mtu;
2302 /* Constrain PDU size for BR/EDR connections */
2304 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
2306 /* Adjust for largest possible L2CAP overhead. */
2308 pdu_len -= L2CAP_FCS_SIZE;
2310 pdu_len -= __ertm_hdr_size(chan);
2312 /* Remote device may have requested smaller PDUs */
2313 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2315 if (len <= pdu_len) {
2316 sar = L2CAP_SAR_UNSEGMENTED;
2320 sar = L2CAP_SAR_START;
2325 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
2328 __skb_queue_purge(seg_queue);
2329 return PTR_ERR(skb);
2332 bt_cb(skb)->l2cap.sar = sar;
2333 __skb_queue_tail(seg_queue, skb);
2339 if (len <= pdu_len) {
2340 sar = L2CAP_SAR_END;
2343 sar = L2CAP_SAR_CONTINUE;
2350 static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan,
2352 size_t len, u16 sdulen)
2354 struct l2cap_conn *conn = chan->conn;
2355 struct sk_buff *skb;
2356 int err, count, hlen;
2357 struct l2cap_hdr *lh;
2359 BT_DBG("chan %p len %zu", chan, len);
2362 return ERR_PTR(-ENOTCONN);
2364 hlen = L2CAP_HDR_SIZE;
2367 hlen += L2CAP_SDULEN_SIZE;
2369 count = min_t(unsigned int, (conn->mtu - hlen), len);
2371 skb = chan->ops->alloc_skb(chan, hlen, count,
2372 msg->msg_flags & MSG_DONTWAIT);
2376 /* Create L2CAP header */
2377 lh = skb_put(skb, L2CAP_HDR_SIZE);
2378 lh->cid = cpu_to_le16(chan->dcid);
2379 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
2382 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
2384 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2385 if (unlikely(err < 0)) {
2387 return ERR_PTR(err);
2393 static int l2cap_segment_le_sdu(struct l2cap_chan *chan,
2394 struct sk_buff_head *seg_queue,
2395 struct msghdr *msg, size_t len)
2397 struct sk_buff *skb;
2401 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
2404 pdu_len = chan->remote_mps - L2CAP_SDULEN_SIZE;
2410 skb = l2cap_create_le_flowctl_pdu(chan, msg, pdu_len, sdu_len);
2412 __skb_queue_purge(seg_queue);
2413 return PTR_ERR(skb);
2416 __skb_queue_tail(seg_queue, skb);
2422 pdu_len += L2CAP_SDULEN_SIZE;
2429 static void l2cap_le_flowctl_send(struct l2cap_chan *chan)
2433 BT_DBG("chan %p", chan);
2435 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
2436 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
2441 BT_DBG("Sent %d credits %u queued %u", sent, chan->tx_credits,
2442 skb_queue_len(&chan->tx_q));
2445 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
2447 struct sk_buff *skb;
2449 struct sk_buff_head seg_queue;
2454 /* Connectionless channel */
2455 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
2456 skb = l2cap_create_connless_pdu(chan, msg, len);
2458 return PTR_ERR(skb);
2460 /* Channel lock is released before requesting new skb and then
2461 * reacquired thus we need to recheck channel state.
2463 if (chan->state != BT_CONNECTED) {
2468 l2cap_do_send(chan, skb);
2472 switch (chan->mode) {
2473 case L2CAP_MODE_LE_FLOWCTL:
2474 /* Check outgoing MTU */
2475 if (len > chan->omtu)
2478 __skb_queue_head_init(&seg_queue);
2480 err = l2cap_segment_le_sdu(chan, &seg_queue, msg, len);
2482 if (chan->state != BT_CONNECTED) {
2483 __skb_queue_purge(&seg_queue);
2490 skb_queue_splice_tail_init(&seg_queue, &chan->tx_q);
2492 l2cap_le_flowctl_send(chan);
2494 if (!chan->tx_credits)
2495 chan->ops->suspend(chan);
2501 case L2CAP_MODE_BASIC:
2502 /* Check outgoing MTU */
2503 if (len > chan->omtu)
2506 /* Create a basic PDU */
2507 skb = l2cap_create_basic_pdu(chan, msg, len);
2509 return PTR_ERR(skb);
2511 /* Channel lock is released before requesting new skb and then
2512 * reacquired thus we need to recheck channel state.
2514 if (chan->state != BT_CONNECTED) {
2519 l2cap_do_send(chan, skb);
2523 case L2CAP_MODE_ERTM:
2524 case L2CAP_MODE_STREAMING:
2525 /* Check outgoing MTU */
2526 if (len > chan->omtu) {
2531 __skb_queue_head_init(&seg_queue);
2533 /* Do segmentation before calling in to the state machine,
2534 * since it's possible to block while waiting for memory
2537 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
2539 /* The channel could have been closed while segmenting,
2540 * check that it is still connected.
2542 if (chan->state != BT_CONNECTED) {
2543 __skb_queue_purge(&seg_queue);
2550 if (chan->mode == L2CAP_MODE_ERTM)
2551 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
2553 l2cap_streaming_send(chan, &seg_queue);
2557 /* If the skbs were not queued for sending, they'll still be in
2558 * seg_queue and need to be purged.
2560 __skb_queue_purge(&seg_queue);
2564 BT_DBG("bad state %1.1x", chan->mode);
2570 EXPORT_SYMBOL_GPL(l2cap_chan_send);
2572 static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2574 struct l2cap_ctrl control;
2577 BT_DBG("chan %p, txseq %u", chan, txseq);
2579 memset(&control, 0, sizeof(control));
2581 control.super = L2CAP_SUPER_SREJ;
2583 for (seq = chan->expected_tx_seq; seq != txseq;
2584 seq = __next_seq(chan, seq)) {
2585 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2586 control.reqseq = seq;
2587 l2cap_send_sframe(chan, &control);
2588 l2cap_seq_list_append(&chan->srej_list, seq);
2592 chan->expected_tx_seq = __next_seq(chan, txseq);
2595 static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2597 struct l2cap_ctrl control;
2599 BT_DBG("chan %p", chan);
2601 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2604 memset(&control, 0, sizeof(control));
2606 control.super = L2CAP_SUPER_SREJ;
2607 control.reqseq = chan->srej_list.tail;
2608 l2cap_send_sframe(chan, &control);
2611 static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2613 struct l2cap_ctrl control;
2617 BT_DBG("chan %p, txseq %u", chan, txseq);
2619 memset(&control, 0, sizeof(control));
2621 control.super = L2CAP_SUPER_SREJ;
2623 /* Capture initial list head to allow only one pass through the list. */
2624 initial_head = chan->srej_list.head;
2627 seq = l2cap_seq_list_pop(&chan->srej_list);
2628 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2631 control.reqseq = seq;
2632 l2cap_send_sframe(chan, &control);
2633 l2cap_seq_list_append(&chan->srej_list, seq);
2634 } while (chan->srej_list.head != initial_head);
2637 static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2639 struct sk_buff *acked_skb;
2642 BT_DBG("chan %p, reqseq %u", chan, reqseq);
2644 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2647 BT_DBG("expected_ack_seq %u, unacked_frames %u",
2648 chan->expected_ack_seq, chan->unacked_frames);
2650 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2651 ackseq = __next_seq(chan, ackseq)) {
2653 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2655 skb_unlink(acked_skb, &chan->tx_q);
2656 kfree_skb(acked_skb);
2657 chan->unacked_frames--;
2661 chan->expected_ack_seq = reqseq;
2663 if (chan->unacked_frames == 0)
2664 __clear_retrans_timer(chan);
2666 BT_DBG("unacked_frames %u", chan->unacked_frames);
2669 static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2671 BT_DBG("chan %p", chan);
2673 chan->expected_tx_seq = chan->buffer_seq;
2674 l2cap_seq_list_clear(&chan->srej_list);
2675 skb_queue_purge(&chan->srej_q);
2676 chan->rx_state = L2CAP_RX_STATE_RECV;
2679 static void l2cap_tx_state_xmit(struct l2cap_chan *chan,
2680 struct l2cap_ctrl *control,
2681 struct sk_buff_head *skbs, u8 event)
2683 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2687 case L2CAP_EV_DATA_REQUEST:
2688 if (chan->tx_send_head == NULL)
2689 chan->tx_send_head = skb_peek(skbs);
2691 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2692 l2cap_ertm_send(chan);
2694 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2695 BT_DBG("Enter LOCAL_BUSY");
2696 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2698 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2699 /* The SREJ_SENT state must be aborted if we are to
2700 * enter the LOCAL_BUSY state.
2702 l2cap_abort_rx_srej_sent(chan);
2705 l2cap_send_ack(chan);
2708 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2709 BT_DBG("Exit LOCAL_BUSY");
2710 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2712 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2713 struct l2cap_ctrl local_control;
2715 memset(&local_control, 0, sizeof(local_control));
2716 local_control.sframe = 1;
2717 local_control.super = L2CAP_SUPER_RR;
2718 local_control.poll = 1;
2719 local_control.reqseq = chan->buffer_seq;
2720 l2cap_send_sframe(chan, &local_control);
2722 chan->retry_count = 1;
2723 __set_monitor_timer(chan);
2724 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2727 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2728 l2cap_process_reqseq(chan, control->reqseq);
2730 case L2CAP_EV_EXPLICIT_POLL:
2731 l2cap_send_rr_or_rnr(chan, 1);
2732 chan->retry_count = 1;
2733 __set_monitor_timer(chan);
2734 __clear_ack_timer(chan);
2735 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2737 case L2CAP_EV_RETRANS_TO:
2738 l2cap_send_rr_or_rnr(chan, 1);
2739 chan->retry_count = 1;
2740 __set_monitor_timer(chan);
2741 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2743 case L2CAP_EV_RECV_FBIT:
2744 /* Nothing to process */
2751 static void l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2752 struct l2cap_ctrl *control,
2753 struct sk_buff_head *skbs, u8 event)
2755 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2759 case L2CAP_EV_DATA_REQUEST:
2760 if (chan->tx_send_head == NULL)
2761 chan->tx_send_head = skb_peek(skbs);
2762 /* Queue data, but don't send. */
2763 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2765 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2766 BT_DBG("Enter LOCAL_BUSY");
2767 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2769 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2770 /* The SREJ_SENT state must be aborted if we are to
2771 * enter the LOCAL_BUSY state.
2773 l2cap_abort_rx_srej_sent(chan);
2776 l2cap_send_ack(chan);
2779 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2780 BT_DBG("Exit LOCAL_BUSY");
2781 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2783 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2784 struct l2cap_ctrl local_control;
2785 memset(&local_control, 0, sizeof(local_control));
2786 local_control.sframe = 1;
2787 local_control.super = L2CAP_SUPER_RR;
2788 local_control.poll = 1;
2789 local_control.reqseq = chan->buffer_seq;
2790 l2cap_send_sframe(chan, &local_control);
2792 chan->retry_count = 1;
2793 __set_monitor_timer(chan);
2794 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2797 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2798 l2cap_process_reqseq(chan, control->reqseq);
2802 case L2CAP_EV_RECV_FBIT:
2803 if (control && control->final) {
2804 __clear_monitor_timer(chan);
2805 if (chan->unacked_frames > 0)
2806 __set_retrans_timer(chan);
2807 chan->retry_count = 0;
2808 chan->tx_state = L2CAP_TX_STATE_XMIT;
2809 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2812 case L2CAP_EV_EXPLICIT_POLL:
2815 case L2CAP_EV_MONITOR_TO:
2816 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2817 l2cap_send_rr_or_rnr(chan, 1);
2818 __set_monitor_timer(chan);
2819 chan->retry_count++;
2821 l2cap_send_disconn_req(chan, ECONNABORTED);
2829 static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2830 struct sk_buff_head *skbs, u8 event)
2832 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2833 chan, control, skbs, event, chan->tx_state);
2835 switch (chan->tx_state) {
2836 case L2CAP_TX_STATE_XMIT:
2837 l2cap_tx_state_xmit(chan, control, skbs, event);
2839 case L2CAP_TX_STATE_WAIT_F:
2840 l2cap_tx_state_wait_f(chan, control, skbs, event);
2848 static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2849 struct l2cap_ctrl *control)
2851 BT_DBG("chan %p, control %p", chan, control);
2852 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
2855 static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2856 struct l2cap_ctrl *control)
2858 BT_DBG("chan %p, control %p", chan, control);
2859 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT);
2862 /* Copy frame to all raw sockets on that connection */
2863 static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2865 struct sk_buff *nskb;
2866 struct l2cap_chan *chan;
2868 BT_DBG("conn %p", conn);
2870 mutex_lock(&conn->chan_lock);
2872 list_for_each_entry(chan, &conn->chan_l, list) {
2873 if (chan->chan_type != L2CAP_CHAN_RAW)
2876 /* Don't send frame to the channel it came from */
2877 if (bt_cb(skb)->l2cap.chan == chan)
2880 nskb = skb_clone(skb, GFP_KERNEL);
2883 if (chan->ops->recv(chan, nskb))
2887 mutex_unlock(&conn->chan_lock);
2890 /* ---- L2CAP signalling commands ---- */
2891 static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
2892 u8 ident, u16 dlen, void *data)
2894 struct sk_buff *skb, **frag;
2895 struct l2cap_cmd_hdr *cmd;
2896 struct l2cap_hdr *lh;
2899 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
2900 conn, code, ident, dlen);
2902 if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE)
2905 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2906 count = min_t(unsigned int, conn->mtu, len);
2908 skb = bt_skb_alloc(count, GFP_KERNEL);
2912 lh = skb_put(skb, L2CAP_HDR_SIZE);
2913 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
2915 if (conn->hcon->type == LE_LINK)
2916 lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING);
2918 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
2920 cmd = skb_put(skb, L2CAP_CMD_HDR_SIZE);
2923 cmd->len = cpu_to_le16(dlen);
2926 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2927 skb_put_data(skb, data, count);
2933 /* Continuation fragments (no L2CAP header) */
2934 frag = &skb_shinfo(skb)->frag_list;
2936 count = min_t(unsigned int, conn->mtu, len);
2938 *frag = bt_skb_alloc(count, GFP_KERNEL);
2942 skb_put_data(*frag, data, count);
2947 frag = &(*frag)->next;
2957 static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
2960 struct l2cap_conf_opt *opt = *ptr;
2963 len = L2CAP_CONF_OPT_SIZE + opt->len;
2971 *val = *((u8 *) opt->val);
2975 *val = get_unaligned_le16(opt->val);
2979 *val = get_unaligned_le32(opt->val);
2983 *val = (unsigned long) opt->val;
2987 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
2991 static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val, size_t size)
2993 struct l2cap_conf_opt *opt = *ptr;
2995 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
2997 if (size < L2CAP_CONF_OPT_SIZE + len)
3005 *((u8 *) opt->val) = val;
3009 put_unaligned_le16(val, opt->val);
3013 put_unaligned_le32(val, opt->val);
3017 memcpy(opt->val, (void *) val, len);
3021 *ptr += L2CAP_CONF_OPT_SIZE + len;
3024 static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan, size_t size)
3026 struct l2cap_conf_efs efs;
3028 switch (chan->mode) {
3029 case L2CAP_MODE_ERTM:
3030 efs.id = chan->local_id;
3031 efs.stype = chan->local_stype;
3032 efs.msdu = cpu_to_le16(chan->local_msdu);
3033 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
3034 efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
3035 efs.flush_to = cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO);
3038 case L2CAP_MODE_STREAMING:
3040 efs.stype = L2CAP_SERV_BESTEFFORT;
3041 efs.msdu = cpu_to_le16(chan->local_msdu);
3042 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
3051 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
3052 (unsigned long) &efs, size);
3055 static void l2cap_ack_timeout(struct work_struct *work)
3057 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
3061 BT_DBG("chan %p", chan);
3063 l2cap_chan_lock(chan);
3065 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
3066 chan->last_acked_seq);
3069 l2cap_send_rr_or_rnr(chan, 0);
3071 l2cap_chan_unlock(chan);
3072 l2cap_chan_put(chan);
3075 int l2cap_ertm_init(struct l2cap_chan *chan)
3079 chan->next_tx_seq = 0;
3080 chan->expected_tx_seq = 0;
3081 chan->expected_ack_seq = 0;
3082 chan->unacked_frames = 0;
3083 chan->buffer_seq = 0;
3084 chan->frames_sent = 0;
3085 chan->last_acked_seq = 0;
3087 chan->sdu_last_frag = NULL;
3090 skb_queue_head_init(&chan->tx_q);
3092 chan->local_amp_id = AMP_ID_BREDR;
3093 chan->move_id = AMP_ID_BREDR;
3094 chan->move_state = L2CAP_MOVE_STABLE;
3095 chan->move_role = L2CAP_MOVE_ROLE_NONE;
3097 if (chan->mode != L2CAP_MODE_ERTM)
3100 chan->rx_state = L2CAP_RX_STATE_RECV;
3101 chan->tx_state = L2CAP_TX_STATE_XMIT;
3103 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
3104 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
3105 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
3107 skb_queue_head_init(&chan->srej_q);
3109 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
3113 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
3115 l2cap_seq_list_free(&chan->srej_list);
3120 static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
3123 case L2CAP_MODE_STREAMING:
3124 case L2CAP_MODE_ERTM:
3125 if (l2cap_mode_supported(mode, remote_feat_mask))
3129 return L2CAP_MODE_BASIC;
3133 static inline bool __l2cap_ews_supported(struct l2cap_conn *conn)
3135 return ((conn->local_fixed_chan & L2CAP_FC_A2MP) &&
3136 (conn->feat_mask & L2CAP_FEAT_EXT_WINDOW));
3139 static inline bool __l2cap_efs_supported(struct l2cap_conn *conn)
3141 return ((conn->local_fixed_chan & L2CAP_FC_A2MP) &&
3142 (conn->feat_mask & L2CAP_FEAT_EXT_FLOW));
3145 static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
3146 struct l2cap_conf_rfc *rfc)
3148 if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) {
3149 u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to;
3151 /* Class 1 devices have must have ERTM timeouts
3152 * exceeding the Link Supervision Timeout. The
3153 * default Link Supervision Timeout for AMP
3154 * controllers is 10 seconds.
3156 * Class 1 devices use 0xffffffff for their
3157 * best-effort flush timeout, so the clamping logic
3158 * will result in a timeout that meets the above
3159 * requirement. ERTM timeouts are 16-bit values, so
3160 * the maximum timeout is 65.535 seconds.
3163 /* Convert timeout to milliseconds and round */
3164 ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000);
3166 /* This is the recommended formula for class 2 devices
3167 * that start ERTM timers when packets are sent to the
3170 ertm_to = 3 * ertm_to + 500;
3172 if (ertm_to > 0xffff)
3175 rfc->retrans_timeout = cpu_to_le16((u16) ertm_to);
3176 rfc->monitor_timeout = rfc->retrans_timeout;
3178 rfc->retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3179 rfc->monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
3183 static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
3185 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
3186 __l2cap_ews_supported(chan->conn)) {
3187 /* use extended control field */
3188 set_bit(FLAG_EXT_CTRL, &chan->flags);
3189 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3191 chan->tx_win = min_t(u16, chan->tx_win,
3192 L2CAP_DEFAULT_TX_WINDOW);
3193 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
3195 chan->ack_win = chan->tx_win;
3198 static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data, size_t data_size)
3200 struct l2cap_conf_req *req = data;
3201 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
3202 void *ptr = req->data;
3203 void *endptr = data + data_size;
3206 BT_DBG("chan %p", chan);
3208 if (chan->num_conf_req || chan->num_conf_rsp)
3211 switch (chan->mode) {
3212 case L2CAP_MODE_STREAMING:
3213 case L2CAP_MODE_ERTM:
3214 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
3217 if (__l2cap_efs_supported(chan->conn))
3218 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3222 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
3227 if (chan->imtu != L2CAP_DEFAULT_MTU)
3228 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu, endptr - ptr);
3230 switch (chan->mode) {
3231 case L2CAP_MODE_BASIC:
3235 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
3236 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
3239 rfc.mode = L2CAP_MODE_BASIC;
3241 rfc.max_transmit = 0;
3242 rfc.retrans_timeout = 0;
3243 rfc.monitor_timeout = 0;
3244 rfc.max_pdu_size = 0;
3246 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3247 (unsigned long) &rfc, endptr - ptr);
3250 case L2CAP_MODE_ERTM:
3251 rfc.mode = L2CAP_MODE_ERTM;
3252 rfc.max_transmit = chan->max_tx;
3254 __l2cap_set_ertm_timeouts(chan, &rfc);
3256 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
3257 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3259 rfc.max_pdu_size = cpu_to_le16(size);
3261 l2cap_txwin_setup(chan);
3263 rfc.txwin_size = min_t(u16, chan->tx_win,
3264 L2CAP_DEFAULT_TX_WINDOW);
3266 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3267 (unsigned long) &rfc, endptr - ptr);
3269 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3270 l2cap_add_opt_efs(&ptr, chan, endptr - ptr);
3272 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3273 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
3274 chan->tx_win, endptr - ptr);
3276 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3277 if (chan->fcs == L2CAP_FCS_NONE ||
3278 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
3279 chan->fcs = L2CAP_FCS_NONE;
3280 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3281 chan->fcs, endptr - ptr);
3285 case L2CAP_MODE_STREAMING:
3286 l2cap_txwin_setup(chan);
3287 rfc.mode = L2CAP_MODE_STREAMING;
3289 rfc.max_transmit = 0;
3290 rfc.retrans_timeout = 0;
3291 rfc.monitor_timeout = 0;
3293 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
3294 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3296 rfc.max_pdu_size = cpu_to_le16(size);
3298 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3299 (unsigned long) &rfc, endptr - ptr);
3301 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3302 l2cap_add_opt_efs(&ptr, chan, endptr - ptr);
3304 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3305 if (chan->fcs == L2CAP_FCS_NONE ||
3306 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
3307 chan->fcs = L2CAP_FCS_NONE;
3308 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3309 chan->fcs, endptr - ptr);
3314 req->dcid = cpu_to_le16(chan->dcid);
3315 req->flags = cpu_to_le16(0);
3320 static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data, size_t data_size)
3322 struct l2cap_conf_rsp *rsp = data;
3323 void *ptr = rsp->data;
3324 void *endptr = data + data_size;
3325 void *req = chan->conf_req;
3326 int len = chan->conf_len;
3327 int type, hint, olen;
3329 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
3330 struct l2cap_conf_efs efs;
3332 u16 mtu = L2CAP_DEFAULT_MTU;
3333 u16 result = L2CAP_CONF_SUCCESS;
3336 BT_DBG("chan %p", chan);
3338 while (len >= L2CAP_CONF_OPT_SIZE) {
3339 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
3341 hint = type & L2CAP_CONF_HINT;
3342 type &= L2CAP_CONF_MASK;
3345 case L2CAP_CONF_MTU:
3349 case L2CAP_CONF_FLUSH_TO:
3350 chan->flush_to = val;
3353 case L2CAP_CONF_QOS:
3356 case L2CAP_CONF_RFC:
3357 if (olen == sizeof(rfc))
3358 memcpy(&rfc, (void *) val, olen);
3361 case L2CAP_CONF_FCS:
3362 if (val == L2CAP_FCS_NONE)
3363 set_bit(CONF_RECV_NO_FCS, &chan->conf_state);
3366 case L2CAP_CONF_EFS:
3367 if (olen == sizeof(efs)) {
3369 memcpy(&efs, (void *) val, olen);
3373 case L2CAP_CONF_EWS:
3374 if (!(chan->conn->local_fixed_chan & L2CAP_FC_A2MP))
3375 return -ECONNREFUSED;
3377 set_bit(FLAG_EXT_CTRL, &chan->flags);
3378 set_bit(CONF_EWS_RECV, &chan->conf_state);
3379 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3380 chan->remote_tx_win = val;
3387 result = L2CAP_CONF_UNKNOWN;
3388 *((u8 *) ptr++) = type;
3393 if (chan->num_conf_rsp || chan->num_conf_req > 1)
3396 switch (chan->mode) {
3397 case L2CAP_MODE_STREAMING:
3398 case L2CAP_MODE_ERTM:
3399 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
3400 chan->mode = l2cap_select_mode(rfc.mode,
3401 chan->conn->feat_mask);
3406 if (__l2cap_efs_supported(chan->conn))
3407 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3409 return -ECONNREFUSED;
3412 if (chan->mode != rfc.mode)
3413 return -ECONNREFUSED;
3419 if (chan->mode != rfc.mode) {
3420 result = L2CAP_CONF_UNACCEPT;
3421 rfc.mode = chan->mode;
3423 if (chan->num_conf_rsp == 1)
3424 return -ECONNREFUSED;
3426 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3427 (unsigned long) &rfc, endptr - ptr);
3430 if (result == L2CAP_CONF_SUCCESS) {
3431 /* Configure output options and let the other side know
3432 * which ones we don't like. */
3434 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3435 result = L2CAP_CONF_UNACCEPT;
3438 set_bit(CONF_MTU_DONE, &chan->conf_state);
3440 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu, endptr - ptr);
3443 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
3444 efs.stype != L2CAP_SERV_NOTRAFIC &&
3445 efs.stype != chan->local_stype) {
3447 result = L2CAP_CONF_UNACCEPT;
3449 if (chan->num_conf_req >= 1)
3450 return -ECONNREFUSED;
3452 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3454 (unsigned long) &efs, endptr - ptr);
3456 /* Send PENDING Conf Rsp */
3457 result = L2CAP_CONF_PENDING;
3458 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3463 case L2CAP_MODE_BASIC:
3464 chan->fcs = L2CAP_FCS_NONE;
3465 set_bit(CONF_MODE_DONE, &chan->conf_state);
3468 case L2CAP_MODE_ERTM:
3469 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3470 chan->remote_tx_win = rfc.txwin_size;
3472 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
3474 chan->remote_max_tx = rfc.max_transmit;
3476 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
3477 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3478 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
3479 rfc.max_pdu_size = cpu_to_le16(size);
3480 chan->remote_mps = size;
3482 __l2cap_set_ertm_timeouts(chan, &rfc);
3484 set_bit(CONF_MODE_DONE, &chan->conf_state);
3486 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
3487 sizeof(rfc), (unsigned long) &rfc, endptr - ptr);
3489 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3490 chan->remote_id = efs.id;
3491 chan->remote_stype = efs.stype;
3492 chan->remote_msdu = le16_to_cpu(efs.msdu);
3493 chan->remote_flush_to =
3494 le32_to_cpu(efs.flush_to);
3495 chan->remote_acc_lat =
3496 le32_to_cpu(efs.acc_lat);
3497 chan->remote_sdu_itime =
3498 le32_to_cpu(efs.sdu_itime);
3499 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3501 (unsigned long) &efs, endptr - ptr);
3505 case L2CAP_MODE_STREAMING:
3506 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
3507 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3508 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
3509 rfc.max_pdu_size = cpu_to_le16(size);
3510 chan->remote_mps = size;
3512 set_bit(CONF_MODE_DONE, &chan->conf_state);
3514 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3515 (unsigned long) &rfc, endptr - ptr);
3520 result = L2CAP_CONF_UNACCEPT;
3522 memset(&rfc, 0, sizeof(rfc));
3523 rfc.mode = chan->mode;
3526 if (result == L2CAP_CONF_SUCCESS)
3527 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3529 rsp->scid = cpu_to_le16(chan->dcid);
3530 rsp->result = cpu_to_le16(result);
3531 rsp->flags = cpu_to_le16(0);
3536 static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
3537 void *data, size_t size, u16 *result)
3539 struct l2cap_conf_req *req = data;
3540 void *ptr = req->data;
3541 void *endptr = data + size;
3544 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
3545 struct l2cap_conf_efs efs;
3547 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
3549 while (len >= L2CAP_CONF_OPT_SIZE) {
3550 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3553 case L2CAP_CONF_MTU:
3554 if (val < L2CAP_DEFAULT_MIN_MTU) {
3555 *result = L2CAP_CONF_UNACCEPT;
3556 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
3559 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu, endptr - ptr);
3562 case L2CAP_CONF_FLUSH_TO:
3563 chan->flush_to = val;
3564 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
3565 2, chan->flush_to, endptr - ptr);
3568 case L2CAP_CONF_RFC:
3569 if (olen == sizeof(rfc))
3570 memcpy(&rfc, (void *)val, olen);
3572 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
3573 rfc.mode != chan->mode)
3574 return -ECONNREFUSED;
3578 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
3579 sizeof(rfc), (unsigned long) &rfc, endptr - ptr);
3582 case L2CAP_CONF_EWS:
3583 chan->ack_win = min_t(u16, val, chan->ack_win);
3584 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
3585 chan->tx_win, endptr - ptr);
3588 case L2CAP_CONF_EFS:
3589 if (olen == sizeof(efs)) {
3590 memcpy(&efs, (void *)val, olen);
3592 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
3593 efs.stype != L2CAP_SERV_NOTRAFIC &&
3594 efs.stype != chan->local_stype)
3595 return -ECONNREFUSED;
3597 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
3598 (unsigned long) &efs, endptr - ptr);
3602 case L2CAP_CONF_FCS:
3603 if (*result == L2CAP_CONF_PENDING)
3604 if (val == L2CAP_FCS_NONE)
3605 set_bit(CONF_RECV_NO_FCS,
3611 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
3612 return -ECONNREFUSED;
3614 chan->mode = rfc.mode;
3616 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
3618 case L2CAP_MODE_ERTM:
3619 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3620 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3621 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3622 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3623 chan->ack_win = min_t(u16, chan->ack_win,
3626 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3627 chan->local_msdu = le16_to_cpu(efs.msdu);
3628 chan->local_sdu_itime =
3629 le32_to_cpu(efs.sdu_itime);
3630 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3631 chan->local_flush_to =
3632 le32_to_cpu(efs.flush_to);
3636 case L2CAP_MODE_STREAMING:
3637 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3641 req->dcid = cpu_to_le16(chan->dcid);
3642 req->flags = cpu_to_le16(0);
3647 static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3648 u16 result, u16 flags)
3650 struct l2cap_conf_rsp *rsp = data;
3651 void *ptr = rsp->data;
3653 BT_DBG("chan %p", chan);
3655 rsp->scid = cpu_to_le16(chan->dcid);
3656 rsp->result = cpu_to_le16(result);
3657 rsp->flags = cpu_to_le16(flags);
3662 void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan)
3664 struct l2cap_le_conn_rsp rsp;
3665 struct l2cap_conn *conn = chan->conn;
3667 BT_DBG("chan %p", chan);
3669 rsp.dcid = cpu_to_le16(chan->scid);
3670 rsp.mtu = cpu_to_le16(chan->imtu);
3671 rsp.mps = cpu_to_le16(chan->mps);
3672 rsp.credits = cpu_to_le16(chan->rx_credits);
3673 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
3675 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
3679 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
3681 struct l2cap_conn_rsp rsp;
3682 struct l2cap_conn *conn = chan->conn;
3686 rsp.scid = cpu_to_le16(chan->dcid);
3687 rsp.dcid = cpu_to_le16(chan->scid);
3688 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
3689 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
3692 rsp_code = L2CAP_CREATE_CHAN_RSP;
3694 rsp_code = L2CAP_CONN_RSP;
3696 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3698 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
3700 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
3703 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3704 l2cap_build_conf_req(chan, buf, sizeof(buf)), buf);
3705 chan->num_conf_req++;
3708 static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
3712 /* Use sane default values in case a misbehaving remote device
3713 * did not send an RFC or extended window size option.
3715 u16 txwin_ext = chan->ack_win;
3716 struct l2cap_conf_rfc rfc = {
3718 .retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3719 .monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
3720 .max_pdu_size = cpu_to_le16(chan->imtu),
3721 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3724 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
3726 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
3729 while (len >= L2CAP_CONF_OPT_SIZE) {
3730 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3733 case L2CAP_CONF_RFC:
3734 if (olen == sizeof(rfc))
3735 memcpy(&rfc, (void *)val, olen);
3737 case L2CAP_CONF_EWS:
3744 case L2CAP_MODE_ERTM:
3745 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3746 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3747 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3748 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3749 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3751 chan->ack_win = min_t(u16, chan->ack_win,
3754 case L2CAP_MODE_STREAMING:
3755 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3759 static inline int l2cap_command_rej(struct l2cap_conn *conn,
3760 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3763 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
3765 if (cmd_len < sizeof(*rej))
3768 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
3771 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
3772 cmd->ident == conn->info_ident) {
3773 cancel_delayed_work(&conn->info_timer);
3775 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3776 conn->info_ident = 0;
3778 l2cap_conn_start(conn);
3784 static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3785 struct l2cap_cmd_hdr *cmd,
3786 u8 *data, u8 rsp_code, u8 amp_id)
3788 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3789 struct l2cap_conn_rsp rsp;
3790 struct l2cap_chan *chan = NULL, *pchan;
3791 int result, status = L2CAP_CS_NO_INFO;
3793 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
3794 __le16 psm = req->psm;
3796 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
3798 /* Check if we have socket listening on psm */
3799 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
3800 &conn->hcon->dst, ACL_LINK);
3802 result = L2CAP_CR_BAD_PSM;
3806 mutex_lock(&conn->chan_lock);
3807 l2cap_chan_lock(pchan);
3809 /* Check if the ACL is secure enough (if not SDP) */
3810 if (psm != cpu_to_le16(L2CAP_PSM_SDP) &&
3811 !hci_conn_check_link_mode(conn->hcon)) {
3812 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
3813 result = L2CAP_CR_SEC_BLOCK;
3817 result = L2CAP_CR_NO_MEM;
3819 /* Check if we already have channel with that dcid */
3820 if (__l2cap_get_chan_by_dcid(conn, scid))
3823 chan = pchan->ops->new_connection(pchan);
3827 /* For certain devices (ex: HID mouse), support for authentication,
3828 * pairing and bonding is optional. For such devices, inorder to avoid
3829 * the ACL alive for too long after L2CAP disconnection, reset the ACL
3830 * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect.
3832 conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT;
3834 bacpy(&chan->src, &conn->hcon->src);
3835 bacpy(&chan->dst, &conn->hcon->dst);
3836 chan->src_type = bdaddr_src_type(conn->hcon);
3837 chan->dst_type = bdaddr_dst_type(conn->hcon);
3840 chan->local_amp_id = amp_id;
3842 __l2cap_chan_add(conn, chan);
3846 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
3848 chan->ident = cmd->ident;
3850 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
3851 if (l2cap_chan_check_security(chan, false)) {
3852 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
3853 l2cap_state_change(chan, BT_CONNECT2);
3854 result = L2CAP_CR_PEND;
3855 status = L2CAP_CS_AUTHOR_PEND;
3856 chan->ops->defer(chan);
3858 /* Force pending result for AMP controllers.
3859 * The connection will succeed after the
3860 * physical link is up.
3862 if (amp_id == AMP_ID_BREDR) {
3863 l2cap_state_change(chan, BT_CONFIG);
3864 result = L2CAP_CR_SUCCESS;
3866 l2cap_state_change(chan, BT_CONNECT2);
3867 result = L2CAP_CR_PEND;
3869 status = L2CAP_CS_NO_INFO;
3872 l2cap_state_change(chan, BT_CONNECT2);
3873 result = L2CAP_CR_PEND;
3874 status = L2CAP_CS_AUTHEN_PEND;
3877 l2cap_state_change(chan, BT_CONNECT2);
3878 result = L2CAP_CR_PEND;
3879 status = L2CAP_CS_NO_INFO;
3883 l2cap_chan_unlock(pchan);
3884 mutex_unlock(&conn->chan_lock);
3885 l2cap_chan_put(pchan);
3888 rsp.scid = cpu_to_le16(scid);
3889 rsp.dcid = cpu_to_le16(dcid);
3890 rsp.result = cpu_to_le16(result);
3891 rsp.status = cpu_to_le16(status);
3892 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
3894 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3895 struct l2cap_info_req info;
3896 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
3898 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3899 conn->info_ident = l2cap_get_ident(conn);
3901 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
3903 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
3904 sizeof(info), &info);
3907 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
3908 result == L2CAP_CR_SUCCESS) {
3910 set_bit(CONF_REQ_SENT, &chan->conf_state);
3911 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3912 l2cap_build_conf_req(chan, buf, sizeof(buf)), buf);
3913 chan->num_conf_req++;
3919 static int l2cap_connect_req(struct l2cap_conn *conn,
3920 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
3922 struct hci_dev *hdev = conn->hcon->hdev;
3923 struct hci_conn *hcon = conn->hcon;
3925 if (cmd_len < sizeof(struct l2cap_conn_req))
3929 if (hci_dev_test_flag(hdev, HCI_MGMT) &&
3930 !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags))
3931 mgmt_device_connected(hdev, hcon, 0, NULL, 0);
3932 hci_dev_unlock(hdev);
3934 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
3938 static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
3939 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3942 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3943 u16 scid, dcid, result, status;
3944 struct l2cap_chan *chan;
3948 if (cmd_len < sizeof(*rsp))
3951 scid = __le16_to_cpu(rsp->scid);
3952 dcid = __le16_to_cpu(rsp->dcid);
3953 result = __le16_to_cpu(rsp->result);
3954 status = __le16_to_cpu(rsp->status);
3956 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
3957 dcid, scid, result, status);
3959 mutex_lock(&conn->chan_lock);
3962 chan = __l2cap_get_chan_by_scid(conn, scid);
3968 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3977 l2cap_chan_lock(chan);
3980 case L2CAP_CR_SUCCESS:
3981 l2cap_state_change(chan, BT_CONFIG);
3984 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
3986 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
3989 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3990 l2cap_build_conf_req(chan, req, sizeof(req)), req);
3991 chan->num_conf_req++;
3995 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
3999 l2cap_chan_del(chan, ECONNREFUSED);
4003 l2cap_chan_unlock(chan);
4006 mutex_unlock(&conn->chan_lock);
4011 static inline void set_default_fcs(struct l2cap_chan *chan)
4013 /* FCS is enabled only in ERTM or streaming mode, if one or both
4016 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
4017 chan->fcs = L2CAP_FCS_NONE;
4018 else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state))
4019 chan->fcs = L2CAP_FCS_CRC16;
4022 static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
4023 u8 ident, u16 flags)
4025 struct l2cap_conn *conn = chan->conn;
4027 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
4030 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
4031 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
4033 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
4034 l2cap_build_conf_rsp(chan, data,
4035 L2CAP_CONF_SUCCESS, flags), data);
4038 static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident,
4041 struct l2cap_cmd_rej_cid rej;
4043 rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID);
4044 rej.scid = __cpu_to_le16(scid);
4045 rej.dcid = __cpu_to_le16(dcid);
4047 l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
4050 static inline int l2cap_config_req(struct l2cap_conn *conn,
4051 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4054 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
4057 struct l2cap_chan *chan;
4060 if (cmd_len < sizeof(*req))
4063 dcid = __le16_to_cpu(req->dcid);
4064 flags = __le16_to_cpu(req->flags);
4066 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
4068 chan = l2cap_get_chan_by_scid(conn, dcid);
4070 cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0);
4074 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
4075 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4080 /* Reject if config buffer is too small. */
4081 len = cmd_len - sizeof(*req);
4082 if (chan->conf_len + len > sizeof(chan->conf_req)) {
4083 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
4084 l2cap_build_conf_rsp(chan, rsp,
4085 L2CAP_CONF_REJECT, flags), rsp);
4090 memcpy(chan->conf_req + chan->conf_len, req->data, len);
4091 chan->conf_len += len;
4093 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
4094 /* Incomplete config. Send empty response. */
4095 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
4096 l2cap_build_conf_rsp(chan, rsp,
4097 L2CAP_CONF_SUCCESS, flags), rsp);
4101 /* Complete config. */
4102 len = l2cap_parse_conf_req(chan, rsp, sizeof(rsp));
4104 l2cap_send_disconn_req(chan, ECONNRESET);
4108 chan->ident = cmd->ident;
4109 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
4110 chan->num_conf_rsp++;
4112 /* Reset config buffer. */
4115 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
4118 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
4119 set_default_fcs(chan);
4121 if (chan->mode == L2CAP_MODE_ERTM ||
4122 chan->mode == L2CAP_MODE_STREAMING)
4123 err = l2cap_ertm_init(chan);
4126 l2cap_send_disconn_req(chan, -err);
4128 l2cap_chan_ready(chan);
4133 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
4135 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
4136 l2cap_build_conf_req(chan, buf, sizeof(buf)), buf);
4137 chan->num_conf_req++;
4140 /* Got Conf Rsp PENDING from remote side and assume we sent
4141 Conf Rsp PENDING in the code above */
4142 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
4143 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4145 /* check compatibility */
4147 /* Send rsp for BR/EDR channel */
4149 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
4151 chan->ident = cmd->ident;
4155 l2cap_chan_unlock(chan);
4159 static inline int l2cap_config_rsp(struct l2cap_conn *conn,
4160 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4163 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
4164 u16 scid, flags, result;
4165 struct l2cap_chan *chan;
4166 int len = cmd_len - sizeof(*rsp);
4169 if (cmd_len < sizeof(*rsp))
4172 scid = __le16_to_cpu(rsp->scid);
4173 flags = __le16_to_cpu(rsp->flags);
4174 result = __le16_to_cpu(rsp->result);
4176 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
4179 chan = l2cap_get_chan_by_scid(conn, scid);
4184 case L2CAP_CONF_SUCCESS:
4185 l2cap_conf_rfc_get(chan, rsp->data, len);
4186 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4189 case L2CAP_CONF_PENDING:
4190 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4192 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4195 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
4196 buf, sizeof(buf), &result);
4198 l2cap_send_disconn_req(chan, ECONNRESET);
4202 if (!chan->hs_hcon) {
4203 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
4206 if (l2cap_check_efs(chan)) {
4207 amp_create_logical_link(chan);
4208 chan->ident = cmd->ident;
4214 case L2CAP_CONF_UNACCEPT:
4215 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
4218 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
4219 l2cap_send_disconn_req(chan, ECONNRESET);
4223 /* throw out any old stored conf requests */
4224 result = L2CAP_CONF_SUCCESS;
4225 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
4226 req, sizeof(req), &result);
4228 l2cap_send_disconn_req(chan, ECONNRESET);
4232 l2cap_send_cmd(conn, l2cap_get_ident(conn),
4233 L2CAP_CONF_REQ, len, req);
4234 chan->num_conf_req++;
4235 if (result != L2CAP_CONF_SUCCESS)
4241 l2cap_chan_set_err(chan, ECONNRESET);
4243 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
4244 l2cap_send_disconn_req(chan, ECONNRESET);
4248 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
4251 set_bit(CONF_INPUT_DONE, &chan->conf_state);
4253 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
4254 set_default_fcs(chan);
4256 if (chan->mode == L2CAP_MODE_ERTM ||
4257 chan->mode == L2CAP_MODE_STREAMING)
4258 err = l2cap_ertm_init(chan);
4261 l2cap_send_disconn_req(chan, -err);
4263 l2cap_chan_ready(chan);
4267 l2cap_chan_unlock(chan);
4271 static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
4272 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4275 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4276 struct l2cap_disconn_rsp rsp;
4278 struct l2cap_chan *chan;
4280 if (cmd_len != sizeof(*req))
4283 scid = __le16_to_cpu(req->scid);
4284 dcid = __le16_to_cpu(req->dcid);
4286 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4288 mutex_lock(&conn->chan_lock);
4290 chan = __l2cap_get_chan_by_scid(conn, dcid);
4292 mutex_unlock(&conn->chan_lock);
4293 cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid);
4297 l2cap_chan_lock(chan);
4299 rsp.dcid = cpu_to_le16(chan->scid);
4300 rsp.scid = cpu_to_le16(chan->dcid);
4301 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4303 chan->ops->set_shutdown(chan);
4305 l2cap_chan_hold(chan);
4306 l2cap_chan_del(chan, ECONNRESET);
4308 l2cap_chan_unlock(chan);
4310 chan->ops->close(chan);
4311 l2cap_chan_put(chan);
4313 mutex_unlock(&conn->chan_lock);
4318 static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
4319 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4322 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4324 struct l2cap_chan *chan;
4326 if (cmd_len != sizeof(*rsp))
4329 scid = __le16_to_cpu(rsp->scid);
4330 dcid = __le16_to_cpu(rsp->dcid);
4332 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4334 mutex_lock(&conn->chan_lock);
4336 chan = __l2cap_get_chan_by_scid(conn, scid);
4338 mutex_unlock(&conn->chan_lock);
4342 l2cap_chan_lock(chan);
4344 l2cap_chan_hold(chan);
4345 l2cap_chan_del(chan, 0);
4347 l2cap_chan_unlock(chan);
4349 chan->ops->close(chan);
4350 l2cap_chan_put(chan);
4352 mutex_unlock(&conn->chan_lock);
4357 static inline int l2cap_information_req(struct l2cap_conn *conn,
4358 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4361 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
4364 if (cmd_len != sizeof(*req))
4367 type = __le16_to_cpu(req->type);
4369 BT_DBG("type 0x%4.4x", type);
4371 if (type == L2CAP_IT_FEAT_MASK) {
4373 u32 feat_mask = l2cap_feat_mask;
4374 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
4375 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
4376 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
4378 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
4380 if (conn->local_fixed_chan & L2CAP_FC_A2MP)
4381 feat_mask |= L2CAP_FEAT_EXT_FLOW
4382 | L2CAP_FEAT_EXT_WINDOW;
4384 put_unaligned_le32(feat_mask, rsp->data);
4385 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4387 } else if (type == L2CAP_IT_FIXED_CHAN) {
4389 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
4391 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4392 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
4393 rsp->data[0] = conn->local_fixed_chan;
4394 memset(rsp->data + 1, 0, 7);
4395 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4398 struct l2cap_info_rsp rsp;
4399 rsp.type = cpu_to_le16(type);
4400 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
4401 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4408 static inline int l2cap_information_rsp(struct l2cap_conn *conn,
4409 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4412 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4415 if (cmd_len < sizeof(*rsp))
4418 type = __le16_to_cpu(rsp->type);
4419 result = __le16_to_cpu(rsp->result);
4421 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4423 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4424 if (cmd->ident != conn->info_ident ||
4425 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
4428 cancel_delayed_work(&conn->info_timer);
4430 if (result != L2CAP_IR_SUCCESS) {
4431 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4432 conn->info_ident = 0;
4434 l2cap_conn_start(conn);
4440 case L2CAP_IT_FEAT_MASK:
4441 conn->feat_mask = get_unaligned_le32(rsp->data);
4443 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
4444 struct l2cap_info_req req;
4445 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4447 conn->info_ident = l2cap_get_ident(conn);
4449 l2cap_send_cmd(conn, conn->info_ident,
4450 L2CAP_INFO_REQ, sizeof(req), &req);
4452 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4453 conn->info_ident = 0;
4455 l2cap_conn_start(conn);
4459 case L2CAP_IT_FIXED_CHAN:
4460 conn->remote_fixed_chan = rsp->data[0];
4461 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4462 conn->info_ident = 0;
4464 l2cap_conn_start(conn);
4471 static int l2cap_create_channel_req(struct l2cap_conn *conn,
4472 struct l2cap_cmd_hdr *cmd,
4473 u16 cmd_len, void *data)
4475 struct l2cap_create_chan_req *req = data;
4476 struct l2cap_create_chan_rsp rsp;
4477 struct l2cap_chan *chan;
4478 struct hci_dev *hdev;
4481 if (cmd_len != sizeof(*req))
4484 if (!(conn->local_fixed_chan & L2CAP_FC_A2MP))
4487 psm = le16_to_cpu(req->psm);
4488 scid = le16_to_cpu(req->scid);
4490 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
4492 /* For controller id 0 make BR/EDR connection */
4493 if (req->amp_id == AMP_ID_BREDR) {
4494 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4499 /* Validate AMP controller id */
4500 hdev = hci_dev_get(req->amp_id);
4504 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4509 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4512 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4513 struct hci_conn *hs_hcon;
4515 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
4519 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4524 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4526 mgr->bredr_chan = chan;
4527 chan->hs_hcon = hs_hcon;
4528 chan->fcs = L2CAP_FCS_NONE;
4529 conn->mtu = hdev->block_mtu;
4538 rsp.scid = cpu_to_le16(scid);
4539 rsp.result = cpu_to_le16(L2CAP_CR_BAD_AMP);
4540 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
4542 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4548 static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4550 struct l2cap_move_chan_req req;
4553 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4555 ident = l2cap_get_ident(chan->conn);
4556 chan->ident = ident;
4558 req.icid = cpu_to_le16(chan->scid);
4559 req.dest_amp_id = dest_amp_id;
4561 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4564 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4567 static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
4569 struct l2cap_move_chan_rsp rsp;
4571 BT_DBG("chan %p, result 0x%4.4x", chan, result);
4573 rsp.icid = cpu_to_le16(chan->dcid);
4574 rsp.result = cpu_to_le16(result);
4576 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4580 static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
4582 struct l2cap_move_chan_cfm cfm;
4584 BT_DBG("chan %p, result 0x%4.4x", chan, result);
4586 chan->ident = l2cap_get_ident(chan->conn);
4588 cfm.icid = cpu_to_le16(chan->scid);
4589 cfm.result = cpu_to_le16(result);
4591 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4594 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4597 static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4599 struct l2cap_move_chan_cfm cfm;
4601 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4603 cfm.icid = cpu_to_le16(icid);
4604 cfm.result = cpu_to_le16(L2CAP_MC_UNCONFIRMED);
4606 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4610 static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
4613 struct l2cap_move_chan_cfm_rsp rsp;
4615 BT_DBG("icid 0x%4.4x", icid);
4617 rsp.icid = cpu_to_le16(icid);
4618 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4621 static void __release_logical_link(struct l2cap_chan *chan)
4623 chan->hs_hchan = NULL;
4624 chan->hs_hcon = NULL;
4626 /* Placeholder - release the logical link */
4629 static void l2cap_logical_fail(struct l2cap_chan *chan)
4631 /* Logical link setup failed */
4632 if (chan->state != BT_CONNECTED) {
4633 /* Create channel failure, disconnect */
4634 l2cap_send_disconn_req(chan, ECONNRESET);
4638 switch (chan->move_role) {
4639 case L2CAP_MOVE_ROLE_RESPONDER:
4640 l2cap_move_done(chan);
4641 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4643 case L2CAP_MOVE_ROLE_INITIATOR:
4644 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4645 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4646 /* Remote has only sent pending or
4647 * success responses, clean up
4649 l2cap_move_done(chan);
4652 /* Other amp move states imply that the move
4653 * has already aborted
4655 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4660 static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4661 struct hci_chan *hchan)
4663 struct l2cap_conf_rsp rsp;
4665 chan->hs_hchan = hchan;
4666 chan->hs_hcon->l2cap_data = chan->conn;
4668 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
4670 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
4673 set_default_fcs(chan);
4675 err = l2cap_ertm_init(chan);
4677 l2cap_send_disconn_req(chan, -err);
4679 l2cap_chan_ready(chan);
4683 static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4684 struct hci_chan *hchan)
4686 chan->hs_hcon = hchan->conn;
4687 chan->hs_hcon->l2cap_data = chan->conn;
4689 BT_DBG("move_state %d", chan->move_state);
4691 switch (chan->move_state) {
4692 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4693 /* Move confirm will be sent after a success
4694 * response is received
4696 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4698 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4699 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4700 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4701 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4702 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4703 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4704 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4705 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4706 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4710 /* Move was not in expected state, free the channel */
4711 __release_logical_link(chan);
4713 chan->move_state = L2CAP_MOVE_STABLE;
4717 /* Call with chan locked */
4718 void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4721 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4724 l2cap_logical_fail(chan);
4725 __release_logical_link(chan);
4729 if (chan->state != BT_CONNECTED) {
4730 /* Ignore logical link if channel is on BR/EDR */
4731 if (chan->local_amp_id != AMP_ID_BREDR)
4732 l2cap_logical_finish_create(chan, hchan);
4734 l2cap_logical_finish_move(chan, hchan);
4738 void l2cap_move_start(struct l2cap_chan *chan)
4740 BT_DBG("chan %p", chan);
4742 if (chan->local_amp_id == AMP_ID_BREDR) {
4743 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4745 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4746 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4747 /* Placeholder - start physical link setup */
4749 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4750 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4752 l2cap_move_setup(chan);
4753 l2cap_send_move_chan_req(chan, 0);
4757 static void l2cap_do_create(struct l2cap_chan *chan, int result,
4758 u8 local_amp_id, u8 remote_amp_id)
4760 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4761 local_amp_id, remote_amp_id);
4763 chan->fcs = L2CAP_FCS_NONE;
4765 /* Outgoing channel on AMP */
4766 if (chan->state == BT_CONNECT) {
4767 if (result == L2CAP_CR_SUCCESS) {
4768 chan->local_amp_id = local_amp_id;
4769 l2cap_send_create_chan_req(chan, remote_amp_id);
4771 /* Revert to BR/EDR connect */
4772 l2cap_send_conn_req(chan);
4778 /* Incoming channel on AMP */
4779 if (__l2cap_no_conn_pending(chan)) {
4780 struct l2cap_conn_rsp rsp;
4782 rsp.scid = cpu_to_le16(chan->dcid);
4783 rsp.dcid = cpu_to_le16(chan->scid);
4785 if (result == L2CAP_CR_SUCCESS) {
4786 /* Send successful response */
4787 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
4788 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
4790 /* Send negative response */
4791 rsp.result = cpu_to_le16(L2CAP_CR_NO_MEM);
4792 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
4795 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4798 if (result == L2CAP_CR_SUCCESS) {
4799 l2cap_state_change(chan, BT_CONFIG);
4800 set_bit(CONF_REQ_SENT, &chan->conf_state);
4801 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4803 l2cap_build_conf_req(chan, buf, sizeof(buf)), buf);
4804 chan->num_conf_req++;
4809 static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4812 l2cap_move_setup(chan);
4813 chan->move_id = local_amp_id;
4814 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4816 l2cap_send_move_chan_req(chan, remote_amp_id);
4819 static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4821 struct hci_chan *hchan = NULL;
4823 /* Placeholder - get hci_chan for logical link */
4826 if (hchan->state == BT_CONNECTED) {
4827 /* Logical link is ready to go */
4828 chan->hs_hcon = hchan->conn;
4829 chan->hs_hcon->l2cap_data = chan->conn;
4830 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4831 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4833 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4835 /* Wait for logical link to be ready */
4836 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4839 /* Logical link not available */
4840 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4844 static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4846 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4848 if (result == -EINVAL)
4849 rsp_result = L2CAP_MR_BAD_ID;
4851 rsp_result = L2CAP_MR_NOT_ALLOWED;
4853 l2cap_send_move_chan_rsp(chan, rsp_result);
4856 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4857 chan->move_state = L2CAP_MOVE_STABLE;
4859 /* Restart data transmission */
4860 l2cap_ertm_send(chan);
4863 /* Invoke with locked chan */
4864 void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
4866 u8 local_amp_id = chan->local_amp_id;
4867 u8 remote_amp_id = chan->remote_amp_id;
4869 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4870 chan, result, local_amp_id, remote_amp_id);
4872 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4873 l2cap_chan_unlock(chan);
4877 if (chan->state != BT_CONNECTED) {
4878 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4879 } else if (result != L2CAP_MR_SUCCESS) {
4880 l2cap_do_move_cancel(chan, result);
4882 switch (chan->move_role) {
4883 case L2CAP_MOVE_ROLE_INITIATOR:
4884 l2cap_do_move_initiate(chan, local_amp_id,
4887 case L2CAP_MOVE_ROLE_RESPONDER:
4888 l2cap_do_move_respond(chan, result);
4891 l2cap_do_move_cancel(chan, result);
4897 static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
4898 struct l2cap_cmd_hdr *cmd,
4899 u16 cmd_len, void *data)
4901 struct l2cap_move_chan_req *req = data;
4902 struct l2cap_move_chan_rsp rsp;
4903 struct l2cap_chan *chan;
4905 u16 result = L2CAP_MR_NOT_ALLOWED;
4907 if (cmd_len != sizeof(*req))
4910 icid = le16_to_cpu(req->icid);
4912 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
4914 if (!(conn->local_fixed_chan & L2CAP_FC_A2MP))
4917 chan = l2cap_get_chan_by_dcid(conn, icid);
4919 rsp.icid = cpu_to_le16(icid);
4920 rsp.result = cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
4921 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4926 chan->ident = cmd->ident;
4928 if (chan->scid < L2CAP_CID_DYN_START ||
4929 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4930 (chan->mode != L2CAP_MODE_ERTM &&
4931 chan->mode != L2CAP_MODE_STREAMING)) {
4932 result = L2CAP_MR_NOT_ALLOWED;
4933 goto send_move_response;
4936 if (chan->local_amp_id == req->dest_amp_id) {
4937 result = L2CAP_MR_SAME_ID;
4938 goto send_move_response;
4941 if (req->dest_amp_id != AMP_ID_BREDR) {
4942 struct hci_dev *hdev;
4943 hdev = hci_dev_get(req->dest_amp_id);
4944 if (!hdev || hdev->dev_type != HCI_AMP ||
4945 !test_bit(HCI_UP, &hdev->flags)) {
4949 result = L2CAP_MR_BAD_ID;
4950 goto send_move_response;
4955 /* Detect a move collision. Only send a collision response
4956 * if this side has "lost", otherwise proceed with the move.
4957 * The winner has the larger bd_addr.
4959 if ((__chan_is_moving(chan) ||
4960 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
4961 bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) {
4962 result = L2CAP_MR_COLLISION;
4963 goto send_move_response;
4966 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4967 l2cap_move_setup(chan);
4968 chan->move_id = req->dest_amp_id;
4971 if (req->dest_amp_id == AMP_ID_BREDR) {
4972 /* Moving to BR/EDR */
4973 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4974 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4975 result = L2CAP_MR_PEND;
4977 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4978 result = L2CAP_MR_SUCCESS;
4981 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4982 /* Placeholder - uncomment when amp functions are available */
4983 /*amp_accept_physical(chan, req->dest_amp_id);*/
4984 result = L2CAP_MR_PEND;
4988 l2cap_send_move_chan_rsp(chan, result);
4990 l2cap_chan_unlock(chan);
4995 static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4997 struct l2cap_chan *chan;
4998 struct hci_chan *hchan = NULL;
5000 chan = l2cap_get_chan_by_scid(conn, icid);
5002 l2cap_send_move_chan_cfm_icid(conn, icid);
5006 __clear_chan_timer(chan);
5007 if (result == L2CAP_MR_PEND)
5008 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
5010 switch (chan->move_state) {
5011 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
5012 /* Move confirm will be sent when logical link
5015 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
5017 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
5018 if (result == L2CAP_MR_PEND) {
5020 } else if (test_bit(CONN_LOCAL_BUSY,
5021 &chan->conn_state)) {
5022 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
5024 /* Logical link is up or moving to BR/EDR,
5027 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
5028 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5031 case L2CAP_MOVE_WAIT_RSP:
5033 if (result == L2CAP_MR_SUCCESS) {
5034 /* Remote is ready, send confirm immediately
5035 * after logical link is ready
5037 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
5039 /* Both logical link and move success
5040 * are required to confirm
5042 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
5045 /* Placeholder - get hci_chan for logical link */
5047 /* Logical link not available */
5048 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5052 /* If the logical link is not yet connected, do not
5053 * send confirmation.
5055 if (hchan->state != BT_CONNECTED)
5058 /* Logical link is already ready to go */
5060 chan->hs_hcon = hchan->conn;
5061 chan->hs_hcon->l2cap_data = chan->conn;
5063 if (result == L2CAP_MR_SUCCESS) {
5064 /* Can confirm now */
5065 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5067 /* Now only need move success
5070 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
5073 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
5076 /* Any other amp move state means the move failed. */
5077 chan->move_id = chan->local_amp_id;
5078 l2cap_move_done(chan);
5079 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5082 l2cap_chan_unlock(chan);
5085 static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
5088 struct l2cap_chan *chan;
5090 chan = l2cap_get_chan_by_ident(conn, ident);
5092 /* Could not locate channel, icid is best guess */
5093 l2cap_send_move_chan_cfm_icid(conn, icid);
5097 __clear_chan_timer(chan);
5099 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
5100 if (result == L2CAP_MR_COLLISION) {
5101 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
5103 /* Cleanup - cancel move */
5104 chan->move_id = chan->local_amp_id;
5105 l2cap_move_done(chan);
5109 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5111 l2cap_chan_unlock(chan);
5114 static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
5115 struct l2cap_cmd_hdr *cmd,
5116 u16 cmd_len, void *data)
5118 struct l2cap_move_chan_rsp *rsp = data;
5121 if (cmd_len != sizeof(*rsp))
5124 icid = le16_to_cpu(rsp->icid);
5125 result = le16_to_cpu(rsp->result);
5127 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
5129 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
5130 l2cap_move_continue(conn, icid, result);
5132 l2cap_move_fail(conn, cmd->ident, icid, result);
5137 static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
5138 struct l2cap_cmd_hdr *cmd,
5139 u16 cmd_len, void *data)
5141 struct l2cap_move_chan_cfm *cfm = data;
5142 struct l2cap_chan *chan;
5145 if (cmd_len != sizeof(*cfm))
5148 icid = le16_to_cpu(cfm->icid);
5149 result = le16_to_cpu(cfm->result);
5151 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
5153 chan = l2cap_get_chan_by_dcid(conn, icid);
5155 /* Spec requires a response even if the icid was not found */
5156 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5160 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
5161 if (result == L2CAP_MC_CONFIRMED) {
5162 chan->local_amp_id = chan->move_id;
5163 if (chan->local_amp_id == AMP_ID_BREDR)
5164 __release_logical_link(chan);
5166 chan->move_id = chan->local_amp_id;
5169 l2cap_move_done(chan);
5172 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5174 l2cap_chan_unlock(chan);
5179 static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
5180 struct l2cap_cmd_hdr *cmd,
5181 u16 cmd_len, void *data)
5183 struct l2cap_move_chan_cfm_rsp *rsp = data;
5184 struct l2cap_chan *chan;
5187 if (cmd_len != sizeof(*rsp))
5190 icid = le16_to_cpu(rsp->icid);
5192 BT_DBG("icid 0x%4.4x", icid);
5194 chan = l2cap_get_chan_by_scid(conn, icid);
5198 __clear_chan_timer(chan);
5200 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
5201 chan->local_amp_id = chan->move_id;
5203 if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan)
5204 __release_logical_link(chan);
5206 l2cap_move_done(chan);
5209 l2cap_chan_unlock(chan);
5214 static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
5215 struct l2cap_cmd_hdr *cmd,
5216 u16 cmd_len, u8 *data)
5218 struct hci_conn *hcon = conn->hcon;
5219 struct l2cap_conn_param_update_req *req;
5220 struct l2cap_conn_param_update_rsp rsp;
5221 u16 min, max, latency, to_multiplier;
5224 if (hcon->role != HCI_ROLE_MASTER)
5227 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5230 req = (struct l2cap_conn_param_update_req *) data;
5231 min = __le16_to_cpu(req->min);
5232 max = __le16_to_cpu(req->max);
5233 latency = __le16_to_cpu(req->latency);
5234 to_multiplier = __le16_to_cpu(req->to_multiplier);
5236 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
5237 min, max, latency, to_multiplier);
5239 memset(&rsp, 0, sizeof(rsp));
5241 err = hci_check_conn_params(min, max, latency, to_multiplier);
5243 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
5245 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
5247 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
5253 store_hint = hci_le_conn_update(hcon, min, max, latency,
5255 mgmt_new_conn_param(hcon->hdev, &hcon->dst, hcon->dst_type,
5256 store_hint, min, max, latency,
5264 static int l2cap_le_connect_rsp(struct l2cap_conn *conn,
5265 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5268 struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data;
5269 struct hci_conn *hcon = conn->hcon;
5270 u16 dcid, mtu, mps, credits, result;
5271 struct l2cap_chan *chan;
5274 if (cmd_len < sizeof(*rsp))
5277 dcid = __le16_to_cpu(rsp->dcid);
5278 mtu = __le16_to_cpu(rsp->mtu);
5279 mps = __le16_to_cpu(rsp->mps);
5280 credits = __le16_to_cpu(rsp->credits);
5281 result = __le16_to_cpu(rsp->result);
5283 if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23 ||
5284 dcid < L2CAP_CID_DYN_START ||
5285 dcid > L2CAP_CID_LE_DYN_END))
5288 BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x",
5289 dcid, mtu, mps, credits, result);
5291 mutex_lock(&conn->chan_lock);
5293 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5301 l2cap_chan_lock(chan);
5304 case L2CAP_CR_SUCCESS:
5305 if (__l2cap_get_chan_by_dcid(conn, dcid)) {
5313 chan->remote_mps = mps;
5314 chan->tx_credits = credits;
5315 l2cap_chan_ready(chan);
5318 case L2CAP_CR_AUTHENTICATION:
5319 case L2CAP_CR_ENCRYPTION:
5320 /* If we already have MITM protection we can't do
5323 if (hcon->sec_level > BT_SECURITY_MEDIUM) {
5324 l2cap_chan_del(chan, ECONNREFUSED);
5328 sec_level = hcon->sec_level + 1;
5329 if (chan->sec_level < sec_level)
5330 chan->sec_level = sec_level;
5332 /* We'll need to send a new Connect Request */
5333 clear_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags);
5335 smp_conn_security(hcon, chan->sec_level);
5339 l2cap_chan_del(chan, ECONNREFUSED);
5343 l2cap_chan_unlock(chan);
5346 mutex_unlock(&conn->chan_lock);
5351 static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
5352 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5357 switch (cmd->code) {
5358 case L2CAP_COMMAND_REJ:
5359 l2cap_command_rej(conn, cmd, cmd_len, data);
5362 case L2CAP_CONN_REQ:
5363 err = l2cap_connect_req(conn, cmd, cmd_len, data);
5366 case L2CAP_CONN_RSP:
5367 case L2CAP_CREATE_CHAN_RSP:
5368 l2cap_connect_create_rsp(conn, cmd, cmd_len, data);
5371 case L2CAP_CONF_REQ:
5372 err = l2cap_config_req(conn, cmd, cmd_len, data);
5375 case L2CAP_CONF_RSP:
5376 l2cap_config_rsp(conn, cmd, cmd_len, data);
5379 case L2CAP_DISCONN_REQ:
5380 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
5383 case L2CAP_DISCONN_RSP:
5384 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
5387 case L2CAP_ECHO_REQ:
5388 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5391 case L2CAP_ECHO_RSP:
5394 case L2CAP_INFO_REQ:
5395 err = l2cap_information_req(conn, cmd, cmd_len, data);
5398 case L2CAP_INFO_RSP:
5399 l2cap_information_rsp(conn, cmd, cmd_len, data);
5402 case L2CAP_CREATE_CHAN_REQ:
5403 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5406 case L2CAP_MOVE_CHAN_REQ:
5407 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5410 case L2CAP_MOVE_CHAN_RSP:
5411 l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
5414 case L2CAP_MOVE_CHAN_CFM:
5415 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5418 case L2CAP_MOVE_CHAN_CFM_RSP:
5419 l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
5423 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5431 static int l2cap_le_connect_req(struct l2cap_conn *conn,
5432 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5435 struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data;
5436 struct l2cap_le_conn_rsp rsp;
5437 struct l2cap_chan *chan, *pchan;
5438 u16 dcid, scid, credits, mtu, mps;
5442 if (cmd_len != sizeof(*req))
5445 scid = __le16_to_cpu(req->scid);
5446 mtu = __le16_to_cpu(req->mtu);
5447 mps = __le16_to_cpu(req->mps);
5452 if (mtu < 23 || mps < 23)
5455 BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm),
5458 /* Check if we have socket listening on psm */
5459 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
5460 &conn->hcon->dst, LE_LINK);
5462 result = L2CAP_CR_BAD_PSM;
5467 mutex_lock(&conn->chan_lock);
5468 l2cap_chan_lock(pchan);
5470 if (!smp_sufficient_security(conn->hcon, pchan->sec_level,
5472 result = L2CAP_CR_AUTHENTICATION;
5474 goto response_unlock;
5477 /* Check for valid dynamic CID range */
5478 if (scid < L2CAP_CID_DYN_START || scid > L2CAP_CID_LE_DYN_END) {
5479 result = L2CAP_CR_INVALID_SCID;
5481 goto response_unlock;
5484 /* Check if we already have channel with that dcid */
5485 if (__l2cap_get_chan_by_dcid(conn, scid)) {
5486 result = L2CAP_CR_SCID_IN_USE;
5488 goto response_unlock;
5491 chan = pchan->ops->new_connection(pchan);
5493 result = L2CAP_CR_NO_MEM;
5494 goto response_unlock;
5497 bacpy(&chan->src, &conn->hcon->src);
5498 bacpy(&chan->dst, &conn->hcon->dst);
5499 chan->src_type = bdaddr_src_type(conn->hcon);
5500 chan->dst_type = bdaddr_dst_type(conn->hcon);
5504 chan->remote_mps = mps;
5505 chan->tx_credits = __le16_to_cpu(req->credits);
5507 __l2cap_chan_add(conn, chan);
5509 l2cap_le_flowctl_init(chan);
5512 credits = chan->rx_credits;
5514 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5516 chan->ident = cmd->ident;
5518 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
5519 l2cap_state_change(chan, BT_CONNECT2);
5520 /* The following result value is actually not defined
5521 * for LE CoC but we use it to let the function know
5522 * that it should bail out after doing its cleanup
5523 * instead of sending a response.
5525 result = L2CAP_CR_PEND;
5526 chan->ops->defer(chan);
5528 l2cap_chan_ready(chan);
5529 result = L2CAP_CR_SUCCESS;
5533 l2cap_chan_unlock(pchan);
5534 mutex_unlock(&conn->chan_lock);
5535 l2cap_chan_put(pchan);
5537 if (result == L2CAP_CR_PEND)
5542 rsp.mtu = cpu_to_le16(chan->imtu);
5543 rsp.mps = cpu_to_le16(chan->mps);
5549 rsp.dcid = cpu_to_le16(dcid);
5550 rsp.credits = cpu_to_le16(credits);
5551 rsp.result = cpu_to_le16(result);
5553 l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp);
5558 static inline int l2cap_le_credits(struct l2cap_conn *conn,
5559 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5562 struct l2cap_le_credits *pkt;
5563 struct l2cap_chan *chan;
5564 u16 cid, credits, max_credits;
5566 if (cmd_len != sizeof(*pkt))
5569 pkt = (struct l2cap_le_credits *) data;
5570 cid = __le16_to_cpu(pkt->cid);
5571 credits = __le16_to_cpu(pkt->credits);
5573 BT_DBG("cid 0x%4.4x credits 0x%4.4x", cid, credits);
5575 chan = l2cap_get_chan_by_dcid(conn, cid);
5579 max_credits = LE_FLOWCTL_MAX_CREDITS - chan->tx_credits;
5580 if (credits > max_credits) {
5581 BT_ERR("LE credits overflow");
5582 l2cap_send_disconn_req(chan, ECONNRESET);
5583 l2cap_chan_unlock(chan);
5585 /* Return 0 so that we don't trigger an unnecessary
5586 * command reject packet.
5591 chan->tx_credits += credits;
5593 /* Resume sending */
5594 l2cap_le_flowctl_send(chan);
5596 if (chan->tx_credits)
5597 chan->ops->resume(chan);
5599 l2cap_chan_unlock(chan);
5604 static inline int l2cap_le_command_rej(struct l2cap_conn *conn,
5605 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5608 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
5609 struct l2cap_chan *chan;
5611 if (cmd_len < sizeof(*rej))
5614 mutex_lock(&conn->chan_lock);
5616 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5620 l2cap_chan_lock(chan);
5621 l2cap_chan_del(chan, ECONNREFUSED);
5622 l2cap_chan_unlock(chan);
5625 mutex_unlock(&conn->chan_lock);
5629 static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
5630 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5635 switch (cmd->code) {
5636 case L2CAP_COMMAND_REJ:
5637 l2cap_le_command_rej(conn, cmd, cmd_len, data);
5640 case L2CAP_CONN_PARAM_UPDATE_REQ:
5641 err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data);
5644 case L2CAP_CONN_PARAM_UPDATE_RSP:
5647 case L2CAP_LE_CONN_RSP:
5648 l2cap_le_connect_rsp(conn, cmd, cmd_len, data);
5651 case L2CAP_LE_CONN_REQ:
5652 err = l2cap_le_connect_req(conn, cmd, cmd_len, data);
5655 case L2CAP_LE_CREDITS:
5656 err = l2cap_le_credits(conn, cmd, cmd_len, data);
5659 case L2CAP_DISCONN_REQ:
5660 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
5663 case L2CAP_DISCONN_RSP:
5664 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
5668 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
5676 static inline void l2cap_le_sig_channel(struct l2cap_conn *conn,
5677 struct sk_buff *skb)
5679 struct hci_conn *hcon = conn->hcon;
5680 struct l2cap_cmd_hdr *cmd;
5684 if (hcon->type != LE_LINK)
5687 if (skb->len < L2CAP_CMD_HDR_SIZE)
5690 cmd = (void *) skb->data;
5691 skb_pull(skb, L2CAP_CMD_HDR_SIZE);
5693 len = le16_to_cpu(cmd->len);
5695 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident);
5697 if (len != skb->len || !cmd->ident) {
5698 BT_DBG("corrupted command");
5702 err = l2cap_le_sig_cmd(conn, cmd, len, skb->data);
5704 struct l2cap_cmd_rej_unk rej;
5706 BT_ERR("Wrong link type (%d)", err);
5708 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
5709 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
5717 static inline void l2cap_sig_channel(struct l2cap_conn *conn,
5718 struct sk_buff *skb)
5720 struct hci_conn *hcon = conn->hcon;
5721 u8 *data = skb->data;
5723 struct l2cap_cmd_hdr cmd;
5726 l2cap_raw_recv(conn, skb);
5728 if (hcon->type != ACL_LINK)
5731 while (len >= L2CAP_CMD_HDR_SIZE) {
5733 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5734 data += L2CAP_CMD_HDR_SIZE;
5735 len -= L2CAP_CMD_HDR_SIZE;
5737 cmd_len = le16_to_cpu(cmd.len);
5739 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5742 if (cmd_len > len || !cmd.ident) {
5743 BT_DBG("corrupted command");
5747 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
5749 struct l2cap_cmd_rej_unk rej;
5751 BT_ERR("Wrong link type (%d)", err);
5753 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
5754 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5766 static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
5768 u16 our_fcs, rcv_fcs;
5771 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5772 hdr_size = L2CAP_EXT_HDR_SIZE;
5774 hdr_size = L2CAP_ENH_HDR_SIZE;
5776 if (chan->fcs == L2CAP_FCS_CRC16) {
5777 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
5778 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5779 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5781 if (our_fcs != rcv_fcs)
5787 static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
5789 struct l2cap_ctrl control;
5791 BT_DBG("chan %p", chan);
5793 memset(&control, 0, sizeof(control));
5796 control.reqseq = chan->buffer_seq;
5797 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5799 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5800 control.super = L2CAP_SUPER_RNR;
5801 l2cap_send_sframe(chan, &control);
5804 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5805 chan->unacked_frames > 0)
5806 __set_retrans_timer(chan);
5808 /* Send pending iframes */
5809 l2cap_ertm_send(chan);
5811 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
5812 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5813 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5816 control.super = L2CAP_SUPER_RR;
5817 l2cap_send_sframe(chan, &control);
5821 static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5822 struct sk_buff **last_frag)
5824 /* skb->len reflects data in skb as well as all fragments
5825 * skb->data_len reflects only data in fragments
5827 if (!skb_has_frag_list(skb))
5828 skb_shinfo(skb)->frag_list = new_frag;
5830 new_frag->next = NULL;
5832 (*last_frag)->next = new_frag;
5833 *last_frag = new_frag;
5835 skb->len += new_frag->len;
5836 skb->data_len += new_frag->len;
5837 skb->truesize += new_frag->truesize;
5840 static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5841 struct l2cap_ctrl *control)
5845 switch (control->sar) {
5846 case L2CAP_SAR_UNSEGMENTED:
5850 err = chan->ops->recv(chan, skb);
5853 case L2CAP_SAR_START:
5857 if (!pskb_may_pull(skb, L2CAP_SDULEN_SIZE))
5860 chan->sdu_len = get_unaligned_le16(skb->data);
5861 skb_pull(skb, L2CAP_SDULEN_SIZE);
5863 if (chan->sdu_len > chan->imtu) {
5868 if (skb->len >= chan->sdu_len)
5872 chan->sdu_last_frag = skb;
5878 case L2CAP_SAR_CONTINUE:
5882 append_skb_frag(chan->sdu, skb,
5883 &chan->sdu_last_frag);
5886 if (chan->sdu->len >= chan->sdu_len)
5896 append_skb_frag(chan->sdu, skb,
5897 &chan->sdu_last_frag);
5900 if (chan->sdu->len != chan->sdu_len)
5903 err = chan->ops->recv(chan, chan->sdu);
5906 /* Reassembly complete */
5908 chan->sdu_last_frag = NULL;
5916 kfree_skb(chan->sdu);
5918 chan->sdu_last_frag = NULL;
5925 static int l2cap_resegment(struct l2cap_chan *chan)
5931 void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
5935 if (chan->mode != L2CAP_MODE_ERTM)
5938 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
5939 l2cap_tx(chan, NULL, NULL, event);
5942 static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5945 /* Pass sequential frames to l2cap_reassemble_sdu()
5946 * until a gap is encountered.
5949 BT_DBG("chan %p", chan);
5951 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5952 struct sk_buff *skb;
5953 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5954 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5956 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5961 skb_unlink(skb, &chan->srej_q);
5962 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5963 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->l2cap);
5968 if (skb_queue_empty(&chan->srej_q)) {
5969 chan->rx_state = L2CAP_RX_STATE_RECV;
5970 l2cap_send_ack(chan);
5976 static void l2cap_handle_srej(struct l2cap_chan *chan,
5977 struct l2cap_ctrl *control)
5979 struct sk_buff *skb;
5981 BT_DBG("chan %p, control %p", chan, control);
5983 if (control->reqseq == chan->next_tx_seq) {
5984 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5985 l2cap_send_disconn_req(chan, ECONNRESET);
5989 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5992 BT_DBG("Seq %d not available for retransmission",
5997 if (chan->max_tx != 0 && bt_cb(skb)->l2cap.retries >= chan->max_tx) {
5998 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5999 l2cap_send_disconn_req(chan, ECONNRESET);
6003 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6005 if (control->poll) {
6006 l2cap_pass_to_tx(chan, control);
6008 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6009 l2cap_retransmit(chan, control);
6010 l2cap_ertm_send(chan);
6012 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
6013 set_bit(CONN_SREJ_ACT, &chan->conn_state);
6014 chan->srej_save_reqseq = control->reqseq;
6017 l2cap_pass_to_tx_fbit(chan, control);
6019 if (control->final) {
6020 if (chan->srej_save_reqseq != control->reqseq ||
6021 !test_and_clear_bit(CONN_SREJ_ACT,
6023 l2cap_retransmit(chan, control);
6025 l2cap_retransmit(chan, control);
6026 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
6027 set_bit(CONN_SREJ_ACT, &chan->conn_state);
6028 chan->srej_save_reqseq = control->reqseq;
6034 static void l2cap_handle_rej(struct l2cap_chan *chan,
6035 struct l2cap_ctrl *control)
6037 struct sk_buff *skb;
6039 BT_DBG("chan %p, control %p", chan, control);
6041 if (control->reqseq == chan->next_tx_seq) {
6042 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
6043 l2cap_send_disconn_req(chan, ECONNRESET);
6047 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
6049 if (chan->max_tx && skb &&
6050 bt_cb(skb)->l2cap.retries >= chan->max_tx) {
6051 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
6052 l2cap_send_disconn_req(chan, ECONNRESET);
6056 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6058 l2cap_pass_to_tx(chan, control);
6060 if (control->final) {
6061 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
6062 l2cap_retransmit_all(chan, control);
6064 l2cap_retransmit_all(chan, control);
6065 l2cap_ertm_send(chan);
6066 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
6067 set_bit(CONN_REJ_ACT, &chan->conn_state);
6071 static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
6073 BT_DBG("chan %p, txseq %d", chan, txseq);
6075 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
6076 chan->expected_tx_seq);
6078 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
6079 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
6081 /* See notes below regarding "double poll" and
6084 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6085 BT_DBG("Invalid/Ignore - after SREJ");
6086 return L2CAP_TXSEQ_INVALID_IGNORE;
6088 BT_DBG("Invalid - in window after SREJ sent");
6089 return L2CAP_TXSEQ_INVALID;
6093 if (chan->srej_list.head == txseq) {
6094 BT_DBG("Expected SREJ");
6095 return L2CAP_TXSEQ_EXPECTED_SREJ;
6098 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
6099 BT_DBG("Duplicate SREJ - txseq already stored");
6100 return L2CAP_TXSEQ_DUPLICATE_SREJ;
6103 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
6104 BT_DBG("Unexpected SREJ - not requested");
6105 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
6109 if (chan->expected_tx_seq == txseq) {
6110 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
6112 BT_DBG("Invalid - txseq outside tx window");
6113 return L2CAP_TXSEQ_INVALID;
6116 return L2CAP_TXSEQ_EXPECTED;
6120 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
6121 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
6122 BT_DBG("Duplicate - expected_tx_seq later than txseq");
6123 return L2CAP_TXSEQ_DUPLICATE;
6126 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
6127 /* A source of invalid packets is a "double poll" condition,
6128 * where delays cause us to send multiple poll packets. If
6129 * the remote stack receives and processes both polls,
6130 * sequence numbers can wrap around in such a way that a
6131 * resent frame has a sequence number that looks like new data
6132 * with a sequence gap. This would trigger an erroneous SREJ
6135 * Fortunately, this is impossible with a tx window that's
6136 * less than half of the maximum sequence number, which allows
6137 * invalid frames to be safely ignored.
6139 * With tx window sizes greater than half of the tx window
6140 * maximum, the frame is invalid and cannot be ignored. This
6141 * causes a disconnect.
6144 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6145 BT_DBG("Invalid/Ignore - txseq outside tx window");
6146 return L2CAP_TXSEQ_INVALID_IGNORE;
6148 BT_DBG("Invalid - txseq outside tx window");
6149 return L2CAP_TXSEQ_INVALID;
6152 BT_DBG("Unexpected - txseq indicates missing frames");
6153 return L2CAP_TXSEQ_UNEXPECTED;
6157 static int l2cap_rx_state_recv(struct l2cap_chan *chan,
6158 struct l2cap_ctrl *control,
6159 struct sk_buff *skb, u8 event)
6162 bool skb_in_use = false;
6164 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6168 case L2CAP_EV_RECV_IFRAME:
6169 switch (l2cap_classify_txseq(chan, control->txseq)) {
6170 case L2CAP_TXSEQ_EXPECTED:
6171 l2cap_pass_to_tx(chan, control);
6173 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6174 BT_DBG("Busy, discarding expected seq %d",
6179 chan->expected_tx_seq = __next_seq(chan,
6182 chan->buffer_seq = chan->expected_tx_seq;
6185 err = l2cap_reassemble_sdu(chan, skb, control);
6189 if (control->final) {
6190 if (!test_and_clear_bit(CONN_REJ_ACT,
6191 &chan->conn_state)) {
6193 l2cap_retransmit_all(chan, control);
6194 l2cap_ertm_send(chan);
6198 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
6199 l2cap_send_ack(chan);
6201 case L2CAP_TXSEQ_UNEXPECTED:
6202 l2cap_pass_to_tx(chan, control);
6204 /* Can't issue SREJ frames in the local busy state.
6205 * Drop this frame, it will be seen as missing
6206 * when local busy is exited.
6208 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6209 BT_DBG("Busy, discarding unexpected seq %d",
6214 /* There was a gap in the sequence, so an SREJ
6215 * must be sent for each missing frame. The
6216 * current frame is stored for later use.
6218 skb_queue_tail(&chan->srej_q, skb);
6220 BT_DBG("Queued %p (queue len %d)", skb,
6221 skb_queue_len(&chan->srej_q));
6223 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
6224 l2cap_seq_list_clear(&chan->srej_list);
6225 l2cap_send_srej(chan, control->txseq);
6227 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
6229 case L2CAP_TXSEQ_DUPLICATE:
6230 l2cap_pass_to_tx(chan, control);
6232 case L2CAP_TXSEQ_INVALID_IGNORE:
6234 case L2CAP_TXSEQ_INVALID:
6236 l2cap_send_disconn_req(chan, ECONNRESET);
6240 case L2CAP_EV_RECV_RR:
6241 l2cap_pass_to_tx(chan, control);
6242 if (control->final) {
6243 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6245 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
6246 !__chan_is_moving(chan)) {
6248 l2cap_retransmit_all(chan, control);
6251 l2cap_ertm_send(chan);
6252 } else if (control->poll) {
6253 l2cap_send_i_or_rr_or_rnr(chan);
6255 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6256 &chan->conn_state) &&
6257 chan->unacked_frames)
6258 __set_retrans_timer(chan);
6260 l2cap_ertm_send(chan);
6263 case L2CAP_EV_RECV_RNR:
6264 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6265 l2cap_pass_to_tx(chan, control);
6266 if (control && control->poll) {
6267 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6268 l2cap_send_rr_or_rnr(chan, 0);
6270 __clear_retrans_timer(chan);
6271 l2cap_seq_list_clear(&chan->retrans_list);
6273 case L2CAP_EV_RECV_REJ:
6274 l2cap_handle_rej(chan, control);
6276 case L2CAP_EV_RECV_SREJ:
6277 l2cap_handle_srej(chan, control);
6283 if (skb && !skb_in_use) {
6284 BT_DBG("Freeing %p", skb);
6291 static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
6292 struct l2cap_ctrl *control,
6293 struct sk_buff *skb, u8 event)
6296 u16 txseq = control->txseq;
6297 bool skb_in_use = false;
6299 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6303 case L2CAP_EV_RECV_IFRAME:
6304 switch (l2cap_classify_txseq(chan, txseq)) {
6305 case L2CAP_TXSEQ_EXPECTED:
6306 /* Keep frame for reassembly later */
6307 l2cap_pass_to_tx(chan, control);
6308 skb_queue_tail(&chan->srej_q, skb);
6310 BT_DBG("Queued %p (queue len %d)", skb,
6311 skb_queue_len(&chan->srej_q));
6313 chan->expected_tx_seq = __next_seq(chan, txseq);
6315 case L2CAP_TXSEQ_EXPECTED_SREJ:
6316 l2cap_seq_list_pop(&chan->srej_list);
6318 l2cap_pass_to_tx(chan, control);
6319 skb_queue_tail(&chan->srej_q, skb);
6321 BT_DBG("Queued %p (queue len %d)", skb,
6322 skb_queue_len(&chan->srej_q));
6324 err = l2cap_rx_queued_iframes(chan);
6329 case L2CAP_TXSEQ_UNEXPECTED:
6330 /* Got a frame that can't be reassembled yet.
6331 * Save it for later, and send SREJs to cover
6332 * the missing frames.
6334 skb_queue_tail(&chan->srej_q, skb);
6336 BT_DBG("Queued %p (queue len %d)", skb,
6337 skb_queue_len(&chan->srej_q));
6339 l2cap_pass_to_tx(chan, control);
6340 l2cap_send_srej(chan, control->txseq);
6342 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
6343 /* This frame was requested with an SREJ, but
6344 * some expected retransmitted frames are
6345 * missing. Request retransmission of missing
6348 skb_queue_tail(&chan->srej_q, skb);
6350 BT_DBG("Queued %p (queue len %d)", skb,
6351 skb_queue_len(&chan->srej_q));
6353 l2cap_pass_to_tx(chan, control);
6354 l2cap_send_srej_list(chan, control->txseq);
6356 case L2CAP_TXSEQ_DUPLICATE_SREJ:
6357 /* We've already queued this frame. Drop this copy. */
6358 l2cap_pass_to_tx(chan, control);
6360 case L2CAP_TXSEQ_DUPLICATE:
6361 /* Expecting a later sequence number, so this frame
6362 * was already received. Ignore it completely.
6365 case L2CAP_TXSEQ_INVALID_IGNORE:
6367 case L2CAP_TXSEQ_INVALID:
6369 l2cap_send_disconn_req(chan, ECONNRESET);
6373 case L2CAP_EV_RECV_RR:
6374 l2cap_pass_to_tx(chan, control);
6375 if (control->final) {
6376 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6378 if (!test_and_clear_bit(CONN_REJ_ACT,
6379 &chan->conn_state)) {
6381 l2cap_retransmit_all(chan, control);
6384 l2cap_ertm_send(chan);
6385 } else if (control->poll) {
6386 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6387 &chan->conn_state) &&
6388 chan->unacked_frames) {
6389 __set_retrans_timer(chan);
6392 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6393 l2cap_send_srej_tail(chan);
6395 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6396 &chan->conn_state) &&
6397 chan->unacked_frames)
6398 __set_retrans_timer(chan);
6400 l2cap_send_ack(chan);
6403 case L2CAP_EV_RECV_RNR:
6404 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6405 l2cap_pass_to_tx(chan, control);
6406 if (control->poll) {
6407 l2cap_send_srej_tail(chan);
6409 struct l2cap_ctrl rr_control;
6410 memset(&rr_control, 0, sizeof(rr_control));
6411 rr_control.sframe = 1;
6412 rr_control.super = L2CAP_SUPER_RR;
6413 rr_control.reqseq = chan->buffer_seq;
6414 l2cap_send_sframe(chan, &rr_control);
6418 case L2CAP_EV_RECV_REJ:
6419 l2cap_handle_rej(chan, control);
6421 case L2CAP_EV_RECV_SREJ:
6422 l2cap_handle_srej(chan, control);
6426 if (skb && !skb_in_use) {
6427 BT_DBG("Freeing %p", skb);
6434 static int l2cap_finish_move(struct l2cap_chan *chan)
6436 BT_DBG("chan %p", chan);
6438 chan->rx_state = L2CAP_RX_STATE_RECV;
6441 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6443 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6445 return l2cap_resegment(chan);
6448 static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
6449 struct l2cap_ctrl *control,
6450 struct sk_buff *skb, u8 event)
6454 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6460 l2cap_process_reqseq(chan, control->reqseq);
6462 if (!skb_queue_empty(&chan->tx_q))
6463 chan->tx_send_head = skb_peek(&chan->tx_q);
6465 chan->tx_send_head = NULL;
6467 /* Rewind next_tx_seq to the point expected
6470 chan->next_tx_seq = control->reqseq;
6471 chan->unacked_frames = 0;
6473 err = l2cap_finish_move(chan);
6477 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6478 l2cap_send_i_or_rr_or_rnr(chan);
6480 if (event == L2CAP_EV_RECV_IFRAME)
6483 return l2cap_rx_state_recv(chan, control, NULL, event);
6486 static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
6487 struct l2cap_ctrl *control,
6488 struct sk_buff *skb, u8 event)
6492 if (!control->final)
6495 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6497 chan->rx_state = L2CAP_RX_STATE_RECV;
6498 l2cap_process_reqseq(chan, control->reqseq);
6500 if (!skb_queue_empty(&chan->tx_q))
6501 chan->tx_send_head = skb_peek(&chan->tx_q);
6503 chan->tx_send_head = NULL;
6505 /* Rewind next_tx_seq to the point expected
6508 chan->next_tx_seq = control->reqseq;
6509 chan->unacked_frames = 0;
6512 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6514 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6516 err = l2cap_resegment(chan);
6519 err = l2cap_rx_state_recv(chan, control, skb, event);
6524 static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
6526 /* Make sure reqseq is for a packet that has been sent but not acked */
6529 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
6530 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
6533 static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6534 struct sk_buff *skb, u8 event)
6538 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
6539 control, skb, event, chan->rx_state);
6541 if (__valid_reqseq(chan, control->reqseq)) {
6542 switch (chan->rx_state) {
6543 case L2CAP_RX_STATE_RECV:
6544 err = l2cap_rx_state_recv(chan, control, skb, event);
6546 case L2CAP_RX_STATE_SREJ_SENT:
6547 err = l2cap_rx_state_srej_sent(chan, control, skb,
6550 case L2CAP_RX_STATE_WAIT_P:
6551 err = l2cap_rx_state_wait_p(chan, control, skb, event);
6553 case L2CAP_RX_STATE_WAIT_F:
6554 err = l2cap_rx_state_wait_f(chan, control, skb, event);
6561 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
6562 control->reqseq, chan->next_tx_seq,
6563 chan->expected_ack_seq);
6564 l2cap_send_disconn_req(chan, ECONNRESET);
6570 static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6571 struct sk_buff *skb)
6573 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
6576 if (l2cap_classify_txseq(chan, control->txseq) ==
6577 L2CAP_TXSEQ_EXPECTED) {
6578 l2cap_pass_to_tx(chan, control);
6580 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
6581 __next_seq(chan, chan->buffer_seq));
6583 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6585 l2cap_reassemble_sdu(chan, skb, control);
6588 kfree_skb(chan->sdu);
6591 chan->sdu_last_frag = NULL;
6595 BT_DBG("Freeing %p", skb);
6600 chan->last_acked_seq = control->txseq;
6601 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6606 static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6608 struct l2cap_ctrl *control = &bt_cb(skb)->l2cap;
6612 __unpack_control(chan, skb);
6617 * We can just drop the corrupted I-frame here.
6618 * Receiver will miss it and start proper recovery
6619 * procedures and ask for retransmission.
6621 if (l2cap_check_fcs(chan, skb))
6624 if (!control->sframe && control->sar == L2CAP_SAR_START)
6625 len -= L2CAP_SDULEN_SIZE;
6627 if (chan->fcs == L2CAP_FCS_CRC16)
6628 len -= L2CAP_FCS_SIZE;
6630 if (len > chan->mps) {
6631 l2cap_send_disconn_req(chan, ECONNRESET);
6635 if ((chan->mode == L2CAP_MODE_ERTM ||
6636 chan->mode == L2CAP_MODE_STREAMING) && sk_filter(chan->data, skb))
6639 if (!control->sframe) {
6642 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6643 control->sar, control->reqseq, control->final,
6646 /* Validate F-bit - F=0 always valid, F=1 only
6647 * valid in TX WAIT_F
6649 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
6652 if (chan->mode != L2CAP_MODE_STREAMING) {
6653 event = L2CAP_EV_RECV_IFRAME;
6654 err = l2cap_rx(chan, control, skb, event);
6656 err = l2cap_stream_rx(chan, control, skb);
6660 l2cap_send_disconn_req(chan, ECONNRESET);
6662 const u8 rx_func_to_event[4] = {
6663 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6664 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6667 /* Only I-frames are expected in streaming mode */
6668 if (chan->mode == L2CAP_MODE_STREAMING)
6671 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6672 control->reqseq, control->final, control->poll,
6676 BT_ERR("Trailing bytes: %d in sframe", len);
6677 l2cap_send_disconn_req(chan, ECONNRESET);
6681 /* Validate F and P bits */
6682 if (control->final && (control->poll ||
6683 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6686 event = rx_func_to_event[control->super];
6687 if (l2cap_rx(chan, control, skb, event))
6688 l2cap_send_disconn_req(chan, ECONNRESET);
6698 static void l2cap_chan_le_send_credits(struct l2cap_chan *chan)
6700 struct l2cap_conn *conn = chan->conn;
6701 struct l2cap_le_credits pkt;
6704 return_credits = ((chan->imtu / chan->mps) + 1) - chan->rx_credits;
6706 if (!return_credits)
6709 BT_DBG("chan %p returning %u credits to sender", chan, return_credits);
6711 chan->rx_credits += return_credits;
6713 pkt.cid = cpu_to_le16(chan->scid);
6714 pkt.credits = cpu_to_le16(return_credits);
6716 chan->ident = l2cap_get_ident(conn);
6718 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt);
6721 static int l2cap_le_recv(struct l2cap_chan *chan, struct sk_buff *skb)
6725 BT_DBG("SDU reassemble complete: chan %p skb->len %u", chan, skb->len);
6727 /* Wait recv to confirm reception before updating the credits */
6728 err = chan->ops->recv(chan, skb);
6730 /* Update credits whenever an SDU is received */
6731 l2cap_chan_le_send_credits(chan);
6736 static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6740 if (!chan->rx_credits) {
6741 BT_ERR("No credits to receive LE L2CAP data");
6742 l2cap_send_disconn_req(chan, ECONNRESET);
6746 if (chan->imtu < skb->len) {
6747 BT_ERR("Too big LE L2CAP PDU");
6752 BT_DBG("rx_credits %u -> %u", chan->rx_credits + 1, chan->rx_credits);
6754 /* Update if remote had run out of credits, this should only happens
6755 * if the remote is not using the entire MPS.
6757 if (!chan->rx_credits)
6758 l2cap_chan_le_send_credits(chan);
6765 sdu_len = get_unaligned_le16(skb->data);
6766 skb_pull(skb, L2CAP_SDULEN_SIZE);
6768 BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u",
6769 sdu_len, skb->len, chan->imtu);
6771 if (sdu_len > chan->imtu) {
6772 BT_ERR("Too big LE L2CAP SDU length received");
6777 if (skb->len > sdu_len) {
6778 BT_ERR("Too much LE L2CAP data received");
6783 if (skb->len == sdu_len)
6784 return l2cap_le_recv(chan, skb);
6787 chan->sdu_len = sdu_len;
6788 chan->sdu_last_frag = skb;
6790 /* Detect if remote is not able to use the selected MPS */
6791 if (skb->len + L2CAP_SDULEN_SIZE < chan->mps) {
6792 u16 mps_len = skb->len + L2CAP_SDULEN_SIZE;
6794 /* Adjust the number of credits */
6795 BT_DBG("chan->mps %u -> %u", chan->mps, mps_len);
6796 chan->mps = mps_len;
6797 l2cap_chan_le_send_credits(chan);
6803 BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u",
6804 chan->sdu->len, skb->len, chan->sdu_len);
6806 if (chan->sdu->len + skb->len > chan->sdu_len) {
6807 BT_ERR("Too much LE L2CAP data received");
6812 append_skb_frag(chan->sdu, skb, &chan->sdu_last_frag);
6815 if (chan->sdu->len == chan->sdu_len) {
6816 err = l2cap_le_recv(chan, chan->sdu);
6819 chan->sdu_last_frag = NULL;
6827 kfree_skb(chan->sdu);
6829 chan->sdu_last_frag = NULL;
6833 /* We can't return an error here since we took care of the skb
6834 * freeing internally. An error return would cause the caller to
6835 * do a double-free of the skb.
6840 static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6841 struct sk_buff *skb)
6843 struct l2cap_chan *chan;
6845 chan = l2cap_get_chan_by_scid(conn, cid);
6847 if (cid == L2CAP_CID_A2MP) {
6848 chan = a2mp_channel_create(conn, skb);
6854 l2cap_chan_lock(chan);
6856 BT_DBG("unknown cid 0x%4.4x", cid);
6857 /* Drop packet and return */
6863 BT_DBG("chan %p, len %d", chan, skb->len);
6865 /* If we receive data on a fixed channel before the info req/rsp
6866 * procdure is done simply assume that the channel is supported
6867 * and mark it as ready.
6869 if (chan->chan_type == L2CAP_CHAN_FIXED)
6870 l2cap_chan_ready(chan);
6872 if (chan->state != BT_CONNECTED)
6875 switch (chan->mode) {
6876 case L2CAP_MODE_LE_FLOWCTL:
6877 if (l2cap_le_data_rcv(chan, skb) < 0)
6882 case L2CAP_MODE_BASIC:
6883 /* If socket recv buffers overflows we drop data here
6884 * which is *bad* because L2CAP has to be reliable.
6885 * But we don't have any other choice. L2CAP doesn't
6886 * provide flow control mechanism. */
6888 if (chan->imtu < skb->len) {
6889 BT_ERR("Dropping L2CAP data: receive buffer overflow");
6893 if (!chan->ops->recv(chan, skb))
6897 case L2CAP_MODE_ERTM:
6898 case L2CAP_MODE_STREAMING:
6899 l2cap_data_rcv(chan, skb);
6903 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
6911 l2cap_chan_unlock(chan);
6914 static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6915 struct sk_buff *skb)
6917 struct hci_conn *hcon = conn->hcon;
6918 struct l2cap_chan *chan;
6920 if (hcon->type != ACL_LINK)
6923 chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst,
6928 BT_DBG("chan %p, len %d", chan, skb->len);
6930 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
6933 if (chan->imtu < skb->len)
6936 /* Store remote BD_ADDR and PSM for msg_name */
6937 bacpy(&bt_cb(skb)->l2cap.bdaddr, &hcon->dst);
6938 bt_cb(skb)->l2cap.psm = psm;
6940 if (!chan->ops->recv(chan, skb)) {
6941 l2cap_chan_put(chan);
6946 l2cap_chan_put(chan);
6951 static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6953 struct l2cap_hdr *lh = (void *) skb->data;
6954 struct hci_conn *hcon = conn->hcon;
6958 if (hcon->state != BT_CONNECTED) {
6959 BT_DBG("queueing pending rx skb");
6960 skb_queue_tail(&conn->pending_rx, skb);
6964 skb_pull(skb, L2CAP_HDR_SIZE);
6965 cid = __le16_to_cpu(lh->cid);
6966 len = __le16_to_cpu(lh->len);
6968 if (len != skb->len) {
6973 /* Since we can't actively block incoming LE connections we must
6974 * at least ensure that we ignore incoming data from them.
6976 if (hcon->type == LE_LINK &&
6977 hci_bdaddr_list_lookup(&hcon->hdev->blacklist, &hcon->dst,
6978 bdaddr_dst_type(hcon))) {
6983 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6986 case L2CAP_CID_SIGNALING:
6987 l2cap_sig_channel(conn, skb);
6990 case L2CAP_CID_CONN_LESS:
6991 psm = get_unaligned((__le16 *) skb->data);
6992 skb_pull(skb, L2CAP_PSMLEN_SIZE);
6993 l2cap_conless_channel(conn, psm, skb);
6996 case L2CAP_CID_LE_SIGNALING:
6997 l2cap_le_sig_channel(conn, skb);
7001 l2cap_data_channel(conn, cid, skb);
7006 static void process_pending_rx(struct work_struct *work)
7008 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
7010 struct sk_buff *skb;
7014 while ((skb = skb_dequeue(&conn->pending_rx)))
7015 l2cap_recv_frame(conn, skb);
7018 static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
7020 struct l2cap_conn *conn = hcon->l2cap_data;
7021 struct hci_chan *hchan;
7026 hchan = hci_chan_create(hcon);
7030 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
7032 hci_chan_del(hchan);
7036 kref_init(&conn->ref);
7037 hcon->l2cap_data = conn;
7038 conn->hcon = hci_conn_get(hcon);
7039 conn->hchan = hchan;
7041 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
7043 switch (hcon->type) {
7045 if (hcon->hdev->le_mtu) {
7046 conn->mtu = hcon->hdev->le_mtu;
7051 conn->mtu = hcon->hdev->acl_mtu;
7055 conn->feat_mask = 0;
7057 conn->local_fixed_chan = L2CAP_FC_SIG_BREDR | L2CAP_FC_CONNLESS;
7059 if (hcon->type == ACL_LINK &&
7060 hci_dev_test_flag(hcon->hdev, HCI_HS_ENABLED))
7061 conn->local_fixed_chan |= L2CAP_FC_A2MP;
7063 if (hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED) &&
7064 (bredr_sc_enabled(hcon->hdev) ||
7065 hci_dev_test_flag(hcon->hdev, HCI_FORCE_BREDR_SMP)))
7066 conn->local_fixed_chan |= L2CAP_FC_SMP_BREDR;
7068 mutex_init(&conn->ident_lock);
7069 mutex_init(&conn->chan_lock);
7071 INIT_LIST_HEAD(&conn->chan_l);
7072 INIT_LIST_HEAD(&conn->users);
7074 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
7076 skb_queue_head_init(&conn->pending_rx);
7077 INIT_WORK(&conn->pending_rx_work, process_pending_rx);
7078 INIT_WORK(&conn->id_addr_update_work, l2cap_conn_update_id_addr);
7080 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
7085 static bool is_valid_psm(u16 psm, u8 dst_type) {
7089 if (bdaddr_type_is_le(dst_type))
7090 return (psm <= 0x00ff);
7092 /* PSM must be odd and lsb of upper byte must be 0 */
7093 return ((psm & 0x0101) == 0x0001);
7096 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
7097 bdaddr_t *dst, u8 dst_type)
7099 struct l2cap_conn *conn;
7100 struct hci_conn *hcon;
7101 struct hci_dev *hdev;
7104 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst,
7105 dst_type, __le16_to_cpu(psm));
7107 hdev = hci_get_route(dst, &chan->src, chan->src_type);
7109 return -EHOSTUNREACH;
7113 if (!is_valid_psm(__le16_to_cpu(psm), dst_type) && !cid &&
7114 chan->chan_type != L2CAP_CHAN_RAW) {
7119 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !psm) {
7124 if (chan->chan_type == L2CAP_CHAN_FIXED && !cid) {
7129 switch (chan->mode) {
7130 case L2CAP_MODE_BASIC:
7132 case L2CAP_MODE_LE_FLOWCTL:
7134 case L2CAP_MODE_ERTM:
7135 case L2CAP_MODE_STREAMING:
7144 switch (chan->state) {
7148 /* Already connecting */
7153 /* Already connected */
7167 /* Set destination address and psm */
7168 bacpy(&chan->dst, dst);
7169 chan->dst_type = dst_type;
7174 if (bdaddr_type_is_le(dst_type)) {
7175 /* Convert from L2CAP channel address type to HCI address type
7177 if (dst_type == BDADDR_LE_PUBLIC)
7178 dst_type = ADDR_LE_DEV_PUBLIC;
7180 dst_type = ADDR_LE_DEV_RANDOM;
7182 if (hci_dev_test_flag(hdev, HCI_ADVERTISING))
7183 hcon = hci_connect_le(hdev, dst, dst_type,
7185 HCI_LE_CONN_TIMEOUT,
7186 HCI_ROLE_SLAVE, NULL);
7188 hcon = hci_connect_le_scan(hdev, dst, dst_type,
7190 HCI_LE_CONN_TIMEOUT);
7193 u8 auth_type = l2cap_get_auth_type(chan);
7194 hcon = hci_connect_acl(hdev, dst, chan->sec_level, auth_type);
7198 err = PTR_ERR(hcon);
7202 conn = l2cap_conn_add(hcon);
7204 hci_conn_drop(hcon);
7209 mutex_lock(&conn->chan_lock);
7210 l2cap_chan_lock(chan);
7212 if (cid && __l2cap_get_chan_by_dcid(conn, cid)) {
7213 hci_conn_drop(hcon);
7218 /* Update source addr of the socket */
7219 bacpy(&chan->src, &hcon->src);
7220 chan->src_type = bdaddr_src_type(hcon);
7222 __l2cap_chan_add(conn, chan);
7224 /* l2cap_chan_add takes its own ref so we can drop this one */
7225 hci_conn_drop(hcon);
7227 l2cap_state_change(chan, BT_CONNECT);
7228 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
7230 /* Release chan->sport so that it can be reused by other
7231 * sockets (as it's only used for listening sockets).
7233 write_lock(&chan_list_lock);
7235 write_unlock(&chan_list_lock);
7237 if (hcon->state == BT_CONNECTED) {
7238 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
7239 __clear_chan_timer(chan);
7240 if (l2cap_chan_check_security(chan, true))
7241 l2cap_state_change(chan, BT_CONNECTED);
7243 l2cap_do_start(chan);
7249 l2cap_chan_unlock(chan);
7250 mutex_unlock(&conn->chan_lock);
7252 hci_dev_unlock(hdev);
7256 EXPORT_SYMBOL_GPL(l2cap_chan_connect);
7258 /* ---- L2CAP interface with lower layer (HCI) ---- */
7260 int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
7262 int exact = 0, lm1 = 0, lm2 = 0;
7263 struct l2cap_chan *c;
7265 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
7267 /* Find listening sockets and check their link_mode */
7268 read_lock(&chan_list_lock);
7269 list_for_each_entry(c, &chan_list, global_l) {
7270 if (c->state != BT_LISTEN)
7273 if (!bacmp(&c->src, &hdev->bdaddr)) {
7274 lm1 |= HCI_LM_ACCEPT;
7275 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
7276 lm1 |= HCI_LM_MASTER;
7278 } else if (!bacmp(&c->src, BDADDR_ANY)) {
7279 lm2 |= HCI_LM_ACCEPT;
7280 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
7281 lm2 |= HCI_LM_MASTER;
7284 read_unlock(&chan_list_lock);
7286 return exact ? lm1 : lm2;
7289 /* Find the next fixed channel in BT_LISTEN state, continue iteration
7290 * from an existing channel in the list or from the beginning of the
7291 * global list (by passing NULL as first parameter).
7293 static struct l2cap_chan *l2cap_global_fixed_chan(struct l2cap_chan *c,
7294 struct hci_conn *hcon)
7296 u8 src_type = bdaddr_src_type(hcon);
7298 read_lock(&chan_list_lock);
7301 c = list_next_entry(c, global_l);
7303 c = list_entry(chan_list.next, typeof(*c), global_l);
7305 list_for_each_entry_from(c, &chan_list, global_l) {
7306 if (c->chan_type != L2CAP_CHAN_FIXED)
7308 if (c->state != BT_LISTEN)
7310 if (bacmp(&c->src, &hcon->src) && bacmp(&c->src, BDADDR_ANY))
7312 if (src_type != c->src_type)
7316 read_unlock(&chan_list_lock);
7320 read_unlock(&chan_list_lock);
7325 static void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
7327 struct hci_dev *hdev = hcon->hdev;
7328 struct l2cap_conn *conn;
7329 struct l2cap_chan *pchan;
7332 if (hcon->type != ACL_LINK && hcon->type != LE_LINK)
7335 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
7338 l2cap_conn_del(hcon, bt_to_errno(status));
7342 conn = l2cap_conn_add(hcon);
7346 dst_type = bdaddr_dst_type(hcon);
7348 /* If device is blocked, do not create channels for it */
7349 if (hci_bdaddr_list_lookup(&hdev->blacklist, &hcon->dst, dst_type))
7352 /* Find fixed channels and notify them of the new connection. We
7353 * use multiple individual lookups, continuing each time where
7354 * we left off, because the list lock would prevent calling the
7355 * potentially sleeping l2cap_chan_lock() function.
7357 pchan = l2cap_global_fixed_chan(NULL, hcon);
7359 struct l2cap_chan *chan, *next;
7361 /* Client fixed channels should override server ones */
7362 if (__l2cap_get_chan_by_dcid(conn, pchan->scid))
7365 l2cap_chan_lock(pchan);
7366 chan = pchan->ops->new_connection(pchan);
7368 bacpy(&chan->src, &hcon->src);
7369 bacpy(&chan->dst, &hcon->dst);
7370 chan->src_type = bdaddr_src_type(hcon);
7371 chan->dst_type = dst_type;
7373 __l2cap_chan_add(conn, chan);
7376 l2cap_chan_unlock(pchan);
7378 next = l2cap_global_fixed_chan(pchan, hcon);
7379 l2cap_chan_put(pchan);
7383 l2cap_conn_ready(conn);
7386 int l2cap_disconn_ind(struct hci_conn *hcon)
7388 struct l2cap_conn *conn = hcon->l2cap_data;
7390 BT_DBG("hcon %p", hcon);
7393 return HCI_ERROR_REMOTE_USER_TERM;
7394 return conn->disc_reason;
7397 static void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
7399 if (hcon->type != ACL_LINK && hcon->type != LE_LINK)
7402 BT_DBG("hcon %p reason %d", hcon, reason);
7404 l2cap_conn_del(hcon, bt_to_errno(reason));
7407 static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
7409 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
7412 if (encrypt == 0x00) {
7413 if (chan->sec_level == BT_SECURITY_MEDIUM) {
7414 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
7415 } else if (chan->sec_level == BT_SECURITY_HIGH ||
7416 chan->sec_level == BT_SECURITY_FIPS)
7417 l2cap_chan_close(chan, ECONNREFUSED);
7419 if (chan->sec_level == BT_SECURITY_MEDIUM)
7420 __clear_chan_timer(chan);
7424 static void l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
7426 struct l2cap_conn *conn = hcon->l2cap_data;
7427 struct l2cap_chan *chan;
7432 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
7434 mutex_lock(&conn->chan_lock);
7436 list_for_each_entry(chan, &conn->chan_l, list) {
7437 l2cap_chan_lock(chan);
7439 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
7440 state_to_string(chan->state));
7442 if (chan->scid == L2CAP_CID_A2MP) {
7443 l2cap_chan_unlock(chan);
7447 if (!status && encrypt)
7448 chan->sec_level = hcon->sec_level;
7450 if (!__l2cap_no_conn_pending(chan)) {
7451 l2cap_chan_unlock(chan);
7455 if (!status && (chan->state == BT_CONNECTED ||
7456 chan->state == BT_CONFIG)) {
7457 chan->ops->resume(chan);
7458 l2cap_check_encryption(chan, encrypt);
7459 l2cap_chan_unlock(chan);
7463 if (chan->state == BT_CONNECT) {
7465 l2cap_start_connection(chan);
7467 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
7468 } else if (chan->state == BT_CONNECT2 &&
7469 chan->mode != L2CAP_MODE_LE_FLOWCTL) {
7470 struct l2cap_conn_rsp rsp;
7474 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
7475 res = L2CAP_CR_PEND;
7476 stat = L2CAP_CS_AUTHOR_PEND;
7477 chan->ops->defer(chan);
7479 l2cap_state_change(chan, BT_CONFIG);
7480 res = L2CAP_CR_SUCCESS;
7481 stat = L2CAP_CS_NO_INFO;
7484 l2cap_state_change(chan, BT_DISCONN);
7485 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
7486 res = L2CAP_CR_SEC_BLOCK;
7487 stat = L2CAP_CS_NO_INFO;
7490 rsp.scid = cpu_to_le16(chan->dcid);
7491 rsp.dcid = cpu_to_le16(chan->scid);
7492 rsp.result = cpu_to_le16(res);
7493 rsp.status = cpu_to_le16(stat);
7494 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
7497 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
7498 res == L2CAP_CR_SUCCESS) {
7500 set_bit(CONF_REQ_SENT, &chan->conf_state);
7501 l2cap_send_cmd(conn, l2cap_get_ident(conn),
7503 l2cap_build_conf_req(chan, buf, sizeof(buf)),
7505 chan->num_conf_req++;
7509 l2cap_chan_unlock(chan);
7512 mutex_unlock(&conn->chan_lock);
7515 void l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
7517 struct l2cap_conn *conn = hcon->l2cap_data;
7518 struct l2cap_hdr *hdr;
7521 /* For AMP controller do not create l2cap conn */
7522 if (!conn && hcon->hdev->dev_type != HCI_PRIMARY)
7526 conn = l2cap_conn_add(hcon);
7531 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
7535 case ACL_START_NO_FLUSH:
7538 BT_ERR("Unexpected start frame (len %d)", skb->len);
7539 kfree_skb(conn->rx_skb);
7540 conn->rx_skb = NULL;
7542 l2cap_conn_unreliable(conn, ECOMM);
7545 /* Start fragment always begin with Basic L2CAP header */
7546 if (skb->len < L2CAP_HDR_SIZE) {
7547 BT_ERR("Frame is too short (len %d)", skb->len);
7548 l2cap_conn_unreliable(conn, ECOMM);
7552 hdr = (struct l2cap_hdr *) skb->data;
7553 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
7555 if (len == skb->len) {
7556 /* Complete frame received */
7557 l2cap_recv_frame(conn, skb);
7561 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
7563 if (skb->len > len) {
7564 BT_ERR("Frame is too long (len %d, expected len %d)",
7566 l2cap_conn_unreliable(conn, ECOMM);
7570 /* Allocate skb for the complete frame (with header) */
7571 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
7575 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
7577 conn->rx_len = len - skb->len;
7581 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
7583 if (!conn->rx_len) {
7584 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
7585 l2cap_conn_unreliable(conn, ECOMM);
7589 if (skb->len > conn->rx_len) {
7590 BT_ERR("Fragment is too long (len %d, expected %d)",
7591 skb->len, conn->rx_len);
7592 kfree_skb(conn->rx_skb);
7593 conn->rx_skb = NULL;
7595 l2cap_conn_unreliable(conn, ECOMM);
7599 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
7601 conn->rx_len -= skb->len;
7603 if (!conn->rx_len) {
7604 /* Complete frame received. l2cap_recv_frame
7605 * takes ownership of the skb so set the global
7606 * rx_skb pointer to NULL first.
7608 struct sk_buff *rx_skb = conn->rx_skb;
7609 conn->rx_skb = NULL;
7610 l2cap_recv_frame(conn, rx_skb);
7619 static struct hci_cb l2cap_cb = {
7621 .connect_cfm = l2cap_connect_cfm,
7622 .disconn_cfm = l2cap_disconn_cfm,
7623 .security_cfm = l2cap_security_cfm,
7626 static int l2cap_debugfs_show(struct seq_file *f, void *p)
7628 struct l2cap_chan *c;
7630 read_lock(&chan_list_lock);
7632 list_for_each_entry(c, &chan_list, global_l) {
7633 seq_printf(f, "%pMR (%u) %pMR (%u) %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
7634 &c->src, c->src_type, &c->dst, c->dst_type,
7635 c->state, __le16_to_cpu(c->psm),
7636 c->scid, c->dcid, c->imtu, c->omtu,
7637 c->sec_level, c->mode);
7640 read_unlock(&chan_list_lock);
7645 static int l2cap_debugfs_open(struct inode *inode, struct file *file)
7647 return single_open(file, l2cap_debugfs_show, inode->i_private);
7650 static const struct file_operations l2cap_debugfs_fops = {
7651 .open = l2cap_debugfs_open,
7653 .llseek = seq_lseek,
7654 .release = single_release,
7657 static struct dentry *l2cap_debugfs;
7659 int __init l2cap_init(void)
7663 err = l2cap_init_sockets();
7667 hci_register_cb(&l2cap_cb);
7669 if (IS_ERR_OR_NULL(bt_debugfs))
7672 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
7673 NULL, &l2cap_debugfs_fops);
7678 void l2cap_exit(void)
7680 debugfs_remove(l2cap_debugfs);
7681 hci_unregister_cb(&l2cap_cb);
7682 l2cap_cleanup_sockets();
7685 module_param(disable_ertm, bool, 0644);
7686 MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");