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>
36 #include <net/bluetooth/bluetooth.h>
37 #include <net/bluetooth/hci_core.h>
38 #include <net/bluetooth/l2cap.h>
39 #include <net/bluetooth/smp.h>
40 #include <net/bluetooth/a2mp.h>
41 #include <net/bluetooth/amp.h>
45 static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
46 static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, };
48 static LIST_HEAD(chan_list);
49 static DEFINE_RWLOCK(chan_list_lock);
51 static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
52 u8 code, u8 ident, u16 dlen, void *data);
53 static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
55 static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
56 static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err);
58 static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
59 struct sk_buff_head *skbs, u8 event);
61 /* ---- L2CAP channels ---- */
63 static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
68 list_for_each_entry(c, &conn->chan_l, list) {
75 static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn,
80 list_for_each_entry(c, &conn->chan_l, list) {
87 /* Find channel with given SCID.
88 * Returns locked channel. */
89 static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn,
94 mutex_lock(&conn->chan_lock);
95 c = __l2cap_get_chan_by_scid(conn, cid);
98 mutex_unlock(&conn->chan_lock);
103 /* Find channel with given DCID.
104 * Returns locked channel.
106 static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
109 struct l2cap_chan *c;
111 mutex_lock(&conn->chan_lock);
112 c = __l2cap_get_chan_by_dcid(conn, cid);
115 mutex_unlock(&conn->chan_lock);
120 static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn,
123 struct l2cap_chan *c;
125 list_for_each_entry(c, &conn->chan_l, list) {
126 if (c->ident == ident)
132 static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn,
135 struct l2cap_chan *c;
137 mutex_lock(&conn->chan_lock);
138 c = __l2cap_get_chan_by_ident(conn, ident);
141 mutex_unlock(&conn->chan_lock);
146 static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
148 struct l2cap_chan *c;
150 list_for_each_entry(c, &chan_list, global_l) {
151 if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src))
157 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
161 write_lock(&chan_list_lock);
163 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
176 for (p = 0x1001; p < 0x1100; p += 2)
177 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
178 chan->psm = cpu_to_le16(p);
179 chan->sport = cpu_to_le16(p);
186 write_unlock(&chan_list_lock);
190 int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
192 write_lock(&chan_list_lock);
196 write_unlock(&chan_list_lock);
201 static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
203 u16 cid = L2CAP_CID_DYN_START;
205 for (; cid < L2CAP_CID_DYN_END; cid++) {
206 if (!__l2cap_get_chan_by_scid(conn, cid))
213 static void __l2cap_state_change(struct l2cap_chan *chan, int state)
215 BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state),
216 state_to_string(state));
219 chan->ops->state_change(chan, state);
222 static void l2cap_state_change(struct l2cap_chan *chan, int state)
224 struct sock *sk = chan->sk;
227 __l2cap_state_change(chan, state);
231 static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err)
233 struct sock *sk = chan->sk;
238 static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err)
240 struct sock *sk = chan->sk;
243 __l2cap_chan_set_err(chan, err);
247 static void __set_retrans_timer(struct l2cap_chan *chan)
249 if (!delayed_work_pending(&chan->monitor_timer) &&
250 chan->retrans_timeout) {
251 l2cap_set_timer(chan, &chan->retrans_timer,
252 msecs_to_jiffies(chan->retrans_timeout));
256 static void __set_monitor_timer(struct l2cap_chan *chan)
258 __clear_retrans_timer(chan);
259 if (chan->monitor_timeout) {
260 l2cap_set_timer(chan, &chan->monitor_timer,
261 msecs_to_jiffies(chan->monitor_timeout));
265 static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head,
270 skb_queue_walk(head, skb) {
271 if (bt_cb(skb)->control.txseq == seq)
278 /* ---- L2CAP sequence number lists ---- */
280 /* For ERTM, ordered lists of sequence numbers must be tracked for
281 * SREJ requests that are received and for frames that are to be
282 * retransmitted. These seq_list functions implement a singly-linked
283 * list in an array, where membership in the list can also be checked
284 * in constant time. Items can also be added to the tail of the list
285 * and removed from the head in constant time, without further memory
289 static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size)
291 size_t alloc_size, i;
293 /* Allocated size is a power of 2 to map sequence numbers
294 * (which may be up to 14 bits) in to a smaller array that is
295 * sized for the negotiated ERTM transmit windows.
297 alloc_size = roundup_pow_of_two(size);
299 seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL);
303 seq_list->mask = alloc_size - 1;
304 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
305 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
306 for (i = 0; i < alloc_size; i++)
307 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
312 static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list)
314 kfree(seq_list->list);
317 static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list,
320 /* Constant-time check for list membership */
321 return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR;
324 static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq)
326 u16 mask = seq_list->mask;
328 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) {
329 /* In case someone tries to pop the head of an empty list */
330 return L2CAP_SEQ_LIST_CLEAR;
331 } else if (seq_list->head == seq) {
332 /* Head can be removed in constant time */
333 seq_list->head = seq_list->list[seq & mask];
334 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
336 if (seq_list->head == L2CAP_SEQ_LIST_TAIL) {
337 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
338 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
341 /* Walk the list to find the sequence number */
342 u16 prev = seq_list->head;
343 while (seq_list->list[prev & mask] != seq) {
344 prev = seq_list->list[prev & mask];
345 if (prev == L2CAP_SEQ_LIST_TAIL)
346 return L2CAP_SEQ_LIST_CLEAR;
349 /* Unlink the number from the list and clear it */
350 seq_list->list[prev & mask] = seq_list->list[seq & mask];
351 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
352 if (seq_list->tail == seq)
353 seq_list->tail = prev;
358 static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list)
360 /* Remove the head in constant time */
361 return l2cap_seq_list_remove(seq_list, seq_list->head);
364 static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list)
368 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR)
371 for (i = 0; i <= seq_list->mask; i++)
372 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
374 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
375 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
378 static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq)
380 u16 mask = seq_list->mask;
382 /* All appends happen in constant time */
384 if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR)
387 if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR)
388 seq_list->head = seq;
390 seq_list->list[seq_list->tail & mask] = seq;
392 seq_list->tail = seq;
393 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL;
396 static void l2cap_chan_timeout(struct work_struct *work)
398 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
400 struct l2cap_conn *conn = chan->conn;
403 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
405 mutex_lock(&conn->chan_lock);
406 l2cap_chan_lock(chan);
408 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
409 reason = ECONNREFUSED;
410 else if (chan->state == BT_CONNECT &&
411 chan->sec_level != BT_SECURITY_SDP)
412 reason = ECONNREFUSED;
416 l2cap_chan_close(chan, reason);
418 l2cap_chan_unlock(chan);
420 chan->ops->close(chan);
421 mutex_unlock(&conn->chan_lock);
423 l2cap_chan_put(chan);
426 struct l2cap_chan *l2cap_chan_create(void)
428 struct l2cap_chan *chan;
430 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
434 mutex_init(&chan->lock);
436 write_lock(&chan_list_lock);
437 list_add(&chan->global_l, &chan_list);
438 write_unlock(&chan_list_lock);
440 INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
442 chan->state = BT_OPEN;
444 kref_init(&chan->kref);
446 /* This flag is cleared in l2cap_chan_ready() */
447 set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
449 BT_DBG("chan %p", chan);
454 static void l2cap_chan_destroy(struct kref *kref)
456 struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref);
458 BT_DBG("chan %p", chan);
460 write_lock(&chan_list_lock);
461 list_del(&chan->global_l);
462 write_unlock(&chan_list_lock);
467 void l2cap_chan_hold(struct l2cap_chan *c)
469 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
474 void l2cap_chan_put(struct l2cap_chan *c)
476 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
478 kref_put(&c->kref, l2cap_chan_destroy);
481 void l2cap_chan_set_defaults(struct l2cap_chan *chan)
483 chan->fcs = L2CAP_FCS_CRC16;
484 chan->max_tx = L2CAP_DEFAULT_MAX_TX;
485 chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
486 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
487 chan->ack_win = L2CAP_DEFAULT_TX_WINDOW;
488 chan->sec_level = BT_SECURITY_LOW;
490 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
493 void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
495 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
496 __le16_to_cpu(chan->psm), chan->dcid);
498 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
502 switch (chan->chan_type) {
503 case L2CAP_CHAN_CONN_ORIENTED:
504 if (conn->hcon->type == LE_LINK) {
506 chan->omtu = L2CAP_DEFAULT_MTU;
507 chan->scid = L2CAP_CID_LE_DATA;
508 chan->dcid = L2CAP_CID_LE_DATA;
510 /* Alloc CID for connection-oriented socket */
511 chan->scid = l2cap_alloc_cid(conn);
512 chan->omtu = L2CAP_DEFAULT_MTU;
516 case L2CAP_CHAN_CONN_LESS:
517 /* Connectionless socket */
518 chan->scid = L2CAP_CID_CONN_LESS;
519 chan->dcid = L2CAP_CID_CONN_LESS;
520 chan->omtu = L2CAP_DEFAULT_MTU;
523 case L2CAP_CHAN_CONN_FIX_A2MP:
524 chan->scid = L2CAP_CID_A2MP;
525 chan->dcid = L2CAP_CID_A2MP;
526 chan->omtu = L2CAP_A2MP_DEFAULT_MTU;
527 chan->imtu = L2CAP_A2MP_DEFAULT_MTU;
531 /* Raw socket can send/recv signalling messages only */
532 chan->scid = L2CAP_CID_SIGNALING;
533 chan->dcid = L2CAP_CID_SIGNALING;
534 chan->omtu = L2CAP_DEFAULT_MTU;
537 chan->local_id = L2CAP_BESTEFFORT_ID;
538 chan->local_stype = L2CAP_SERV_BESTEFFORT;
539 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
540 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
541 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
542 chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO;
544 l2cap_chan_hold(chan);
546 list_add(&chan->list, &conn->chan_l);
549 void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
551 mutex_lock(&conn->chan_lock);
552 __l2cap_chan_add(conn, chan);
553 mutex_unlock(&conn->chan_lock);
556 void l2cap_chan_del(struct l2cap_chan *chan, int err)
558 struct l2cap_conn *conn = chan->conn;
560 __clear_chan_timer(chan);
562 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
565 struct amp_mgr *mgr = conn->hcon->amp_mgr;
566 /* Delete from channel list */
567 list_del(&chan->list);
569 l2cap_chan_put(chan);
573 if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP)
574 hci_conn_drop(conn->hcon);
576 if (mgr && mgr->bredr_chan == chan)
577 mgr->bredr_chan = NULL;
580 if (chan->hs_hchan) {
581 struct hci_chan *hs_hchan = chan->hs_hchan;
583 BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan);
584 amp_disconnect_logical_link(hs_hchan);
587 chan->ops->teardown(chan, err);
589 if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
593 case L2CAP_MODE_BASIC:
596 case L2CAP_MODE_ERTM:
597 __clear_retrans_timer(chan);
598 __clear_monitor_timer(chan);
599 __clear_ack_timer(chan);
601 skb_queue_purge(&chan->srej_q);
603 l2cap_seq_list_free(&chan->srej_list);
604 l2cap_seq_list_free(&chan->retrans_list);
608 case L2CAP_MODE_STREAMING:
609 skb_queue_purge(&chan->tx_q);
616 void l2cap_chan_close(struct l2cap_chan *chan, int reason)
618 struct l2cap_conn *conn = chan->conn;
619 struct sock *sk = chan->sk;
621 BT_DBG("chan %p state %s sk %p", chan, state_to_string(chan->state),
624 switch (chan->state) {
626 chan->ops->teardown(chan, 0);
631 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
632 conn->hcon->type == ACL_LINK) {
633 __set_chan_timer(chan, sk->sk_sndtimeo);
634 l2cap_send_disconn_req(chan, reason);
636 l2cap_chan_del(chan, reason);
640 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
641 conn->hcon->type == ACL_LINK) {
642 struct l2cap_conn_rsp rsp;
645 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
646 result = L2CAP_CR_SEC_BLOCK;
648 result = L2CAP_CR_BAD_PSM;
649 l2cap_state_change(chan, BT_DISCONN);
651 rsp.scid = cpu_to_le16(chan->dcid);
652 rsp.dcid = cpu_to_le16(chan->scid);
653 rsp.result = cpu_to_le16(result);
654 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
655 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
659 l2cap_chan_del(chan, reason);
664 l2cap_chan_del(chan, reason);
668 chan->ops->teardown(chan, 0);
673 static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
675 if (chan->chan_type == L2CAP_CHAN_RAW) {
676 switch (chan->sec_level) {
677 case BT_SECURITY_HIGH:
678 return HCI_AT_DEDICATED_BONDING_MITM;
679 case BT_SECURITY_MEDIUM:
680 return HCI_AT_DEDICATED_BONDING;
682 return HCI_AT_NO_BONDING;
684 } else if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) {
685 if (chan->sec_level == BT_SECURITY_LOW)
686 chan->sec_level = BT_SECURITY_SDP;
688 if (chan->sec_level == BT_SECURITY_HIGH)
689 return HCI_AT_NO_BONDING_MITM;
691 return HCI_AT_NO_BONDING;
693 switch (chan->sec_level) {
694 case BT_SECURITY_HIGH:
695 return HCI_AT_GENERAL_BONDING_MITM;
696 case BT_SECURITY_MEDIUM:
697 return HCI_AT_GENERAL_BONDING;
699 return HCI_AT_NO_BONDING;
704 /* Service level security */
705 int l2cap_chan_check_security(struct l2cap_chan *chan)
707 struct l2cap_conn *conn = chan->conn;
710 auth_type = l2cap_get_auth_type(chan);
712 return hci_conn_security(conn->hcon, chan->sec_level, auth_type);
715 static u8 l2cap_get_ident(struct l2cap_conn *conn)
719 /* Get next available identificator.
720 * 1 - 128 are used by kernel.
721 * 129 - 199 are reserved.
722 * 200 - 254 are used by utilities like l2ping, etc.
725 spin_lock(&conn->lock);
727 if (++conn->tx_ident > 128)
732 spin_unlock(&conn->lock);
737 static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
740 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
743 BT_DBG("code 0x%2.2x", code);
748 if (lmp_no_flush_capable(conn->hcon->hdev))
749 flags = ACL_START_NO_FLUSH;
753 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
754 skb->priority = HCI_PRIO_MAX;
756 hci_send_acl(conn->hchan, skb, flags);
759 static bool __chan_is_moving(struct l2cap_chan *chan)
761 return chan->move_state != L2CAP_MOVE_STABLE &&
762 chan->move_state != L2CAP_MOVE_WAIT_PREPARE;
765 static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
767 struct hci_conn *hcon = chan->conn->hcon;
770 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
773 if (chan->hs_hcon && !__chan_is_moving(chan)) {
775 hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE);
782 if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
783 lmp_no_flush_capable(hcon->hdev))
784 flags = ACL_START_NO_FLUSH;
788 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
789 hci_send_acl(chan->conn->hchan, skb, flags);
792 static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
794 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
795 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
797 if (enh & L2CAP_CTRL_FRAME_TYPE) {
800 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
801 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
808 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
809 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
816 static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
818 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
819 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
821 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
824 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
825 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
832 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
833 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
840 static inline void __unpack_control(struct l2cap_chan *chan,
843 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
844 __unpack_extended_control(get_unaligned_le32(skb->data),
845 &bt_cb(skb)->control);
846 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
848 __unpack_enhanced_control(get_unaligned_le16(skb->data),
849 &bt_cb(skb)->control);
850 skb_pull(skb, L2CAP_ENH_CTRL_SIZE);
854 static u32 __pack_extended_control(struct l2cap_ctrl *control)
858 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
859 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
861 if (control->sframe) {
862 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
863 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
864 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
866 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
867 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
873 static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
877 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
878 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
880 if (control->sframe) {
881 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
882 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
883 packed |= L2CAP_CTRL_FRAME_TYPE;
885 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
886 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
892 static inline void __pack_control(struct l2cap_chan *chan,
893 struct l2cap_ctrl *control,
896 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
897 put_unaligned_le32(__pack_extended_control(control),
898 skb->data + L2CAP_HDR_SIZE);
900 put_unaligned_le16(__pack_enhanced_control(control),
901 skb->data + L2CAP_HDR_SIZE);
905 static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan)
907 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
908 return L2CAP_EXT_HDR_SIZE;
910 return L2CAP_ENH_HDR_SIZE;
913 static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
917 struct l2cap_hdr *lh;
918 int hlen = __ertm_hdr_size(chan);
920 if (chan->fcs == L2CAP_FCS_CRC16)
921 hlen += L2CAP_FCS_SIZE;
923 skb = bt_skb_alloc(hlen, GFP_KERNEL);
926 return ERR_PTR(-ENOMEM);
928 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
929 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
930 lh->cid = cpu_to_le16(chan->dcid);
932 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
933 put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
935 put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
937 if (chan->fcs == L2CAP_FCS_CRC16) {
938 u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
939 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
942 skb->priority = HCI_PRIO_MAX;
946 static void l2cap_send_sframe(struct l2cap_chan *chan,
947 struct l2cap_ctrl *control)
952 BT_DBG("chan %p, control %p", chan, control);
954 if (!control->sframe)
957 if (__chan_is_moving(chan))
960 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) &&
964 if (control->super == L2CAP_SUPER_RR)
965 clear_bit(CONN_RNR_SENT, &chan->conn_state);
966 else if (control->super == L2CAP_SUPER_RNR)
967 set_bit(CONN_RNR_SENT, &chan->conn_state);
969 if (control->super != L2CAP_SUPER_SREJ) {
970 chan->last_acked_seq = control->reqseq;
971 __clear_ack_timer(chan);
974 BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq,
975 control->final, control->poll, control->super);
977 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
978 control_field = __pack_extended_control(control);
980 control_field = __pack_enhanced_control(control);
982 skb = l2cap_create_sframe_pdu(chan, control_field);
984 l2cap_do_send(chan, skb);
987 static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll)
989 struct l2cap_ctrl control;
991 BT_DBG("chan %p, poll %d", chan, poll);
993 memset(&control, 0, sizeof(control));
997 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
998 control.super = L2CAP_SUPER_RNR;
1000 control.super = L2CAP_SUPER_RR;
1002 control.reqseq = chan->buffer_seq;
1003 l2cap_send_sframe(chan, &control);
1006 static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
1008 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
1011 static bool __amp_capable(struct l2cap_chan *chan)
1013 struct l2cap_conn *conn = chan->conn;
1016 hci_amp_capable() &&
1017 chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED &&
1018 conn->fixed_chan_mask & L2CAP_FC_A2MP)
1024 static bool l2cap_check_efs(struct l2cap_chan *chan)
1026 /* Check EFS parameters */
1030 void l2cap_send_conn_req(struct l2cap_chan *chan)
1032 struct l2cap_conn *conn = chan->conn;
1033 struct l2cap_conn_req req;
1035 req.scid = cpu_to_le16(chan->scid);
1036 req.psm = chan->psm;
1038 chan->ident = l2cap_get_ident(conn);
1040 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1042 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
1045 static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id)
1047 struct l2cap_create_chan_req req;
1048 req.scid = cpu_to_le16(chan->scid);
1049 req.psm = chan->psm;
1050 req.amp_id = amp_id;
1052 chan->ident = l2cap_get_ident(chan->conn);
1054 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ,
1058 static void l2cap_move_setup(struct l2cap_chan *chan)
1060 struct sk_buff *skb;
1062 BT_DBG("chan %p", chan);
1064 if (chan->mode != L2CAP_MODE_ERTM)
1067 __clear_retrans_timer(chan);
1068 __clear_monitor_timer(chan);
1069 __clear_ack_timer(chan);
1071 chan->retry_count = 0;
1072 skb_queue_walk(&chan->tx_q, skb) {
1073 if (bt_cb(skb)->control.retries)
1074 bt_cb(skb)->control.retries = 1;
1079 chan->expected_tx_seq = chan->buffer_seq;
1081 clear_bit(CONN_REJ_ACT, &chan->conn_state);
1082 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
1083 l2cap_seq_list_clear(&chan->retrans_list);
1084 l2cap_seq_list_clear(&chan->srej_list);
1085 skb_queue_purge(&chan->srej_q);
1087 chan->tx_state = L2CAP_TX_STATE_XMIT;
1088 chan->rx_state = L2CAP_RX_STATE_MOVE;
1090 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
1093 static void l2cap_move_done(struct l2cap_chan *chan)
1095 u8 move_role = chan->move_role;
1096 BT_DBG("chan %p", chan);
1098 chan->move_state = L2CAP_MOVE_STABLE;
1099 chan->move_role = L2CAP_MOVE_ROLE_NONE;
1101 if (chan->mode != L2CAP_MODE_ERTM)
1104 switch (move_role) {
1105 case L2CAP_MOVE_ROLE_INITIATOR:
1106 l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
1107 chan->rx_state = L2CAP_RX_STATE_WAIT_F;
1109 case L2CAP_MOVE_ROLE_RESPONDER:
1110 chan->rx_state = L2CAP_RX_STATE_WAIT_P;
1115 static void l2cap_chan_ready(struct l2cap_chan *chan)
1117 /* This clears all conf flags, including CONF_NOT_COMPLETE */
1118 chan->conf_state = 0;
1119 __clear_chan_timer(chan);
1121 chan->state = BT_CONNECTED;
1123 chan->ops->ready(chan);
1126 static void l2cap_start_connection(struct l2cap_chan *chan)
1128 if (__amp_capable(chan)) {
1129 BT_DBG("chan %p AMP capable: discover AMPs", chan);
1130 a2mp_discover_amp(chan);
1132 l2cap_send_conn_req(chan);
1136 static void l2cap_do_start(struct l2cap_chan *chan)
1138 struct l2cap_conn *conn = chan->conn;
1140 if (conn->hcon->type == LE_LINK) {
1141 l2cap_chan_ready(chan);
1145 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
1146 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1149 if (l2cap_chan_check_security(chan) &&
1150 __l2cap_no_conn_pending(chan)) {
1151 l2cap_start_connection(chan);
1154 struct l2cap_info_req req;
1155 req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
1157 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1158 conn->info_ident = l2cap_get_ident(conn);
1160 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
1162 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
1167 static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1169 u32 local_feat_mask = l2cap_feat_mask;
1171 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1174 case L2CAP_MODE_ERTM:
1175 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1176 case L2CAP_MODE_STREAMING:
1177 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1183 static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err)
1185 struct sock *sk = chan->sk;
1186 struct l2cap_conn *conn = chan->conn;
1187 struct l2cap_disconn_req req;
1192 if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) {
1193 __clear_retrans_timer(chan);
1194 __clear_monitor_timer(chan);
1195 __clear_ack_timer(chan);
1198 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
1199 l2cap_state_change(chan, BT_DISCONN);
1203 req.dcid = cpu_to_le16(chan->dcid);
1204 req.scid = cpu_to_le16(chan->scid);
1205 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ,
1209 __l2cap_state_change(chan, BT_DISCONN);
1210 __l2cap_chan_set_err(chan, err);
1214 /* ---- L2CAP connections ---- */
1215 static void l2cap_conn_start(struct l2cap_conn *conn)
1217 struct l2cap_chan *chan, *tmp;
1219 BT_DBG("conn %p", conn);
1221 mutex_lock(&conn->chan_lock);
1223 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
1224 struct sock *sk = chan->sk;
1226 l2cap_chan_lock(chan);
1228 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
1229 l2cap_chan_unlock(chan);
1233 if (chan->state == BT_CONNECT) {
1234 if (!l2cap_chan_check_security(chan) ||
1235 !__l2cap_no_conn_pending(chan)) {
1236 l2cap_chan_unlock(chan);
1240 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
1241 && test_bit(CONF_STATE2_DEVICE,
1242 &chan->conf_state)) {
1243 l2cap_chan_close(chan, ECONNRESET);
1244 l2cap_chan_unlock(chan);
1248 l2cap_start_connection(chan);
1250 } else if (chan->state == BT_CONNECT2) {
1251 struct l2cap_conn_rsp rsp;
1253 rsp.scid = cpu_to_le16(chan->dcid);
1254 rsp.dcid = cpu_to_le16(chan->scid);
1256 if (l2cap_chan_check_security(chan)) {
1258 if (test_bit(BT_SK_DEFER_SETUP,
1259 &bt_sk(sk)->flags)) {
1260 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1261 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
1262 chan->ops->defer(chan);
1265 __l2cap_state_change(chan, BT_CONFIG);
1266 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
1267 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
1271 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1272 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
1275 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
1278 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
1279 rsp.result != L2CAP_CR_SUCCESS) {
1280 l2cap_chan_unlock(chan);
1284 set_bit(CONF_REQ_SENT, &chan->conf_state);
1285 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
1286 l2cap_build_conf_req(chan, buf), buf);
1287 chan->num_conf_req++;
1290 l2cap_chan_unlock(chan);
1293 mutex_unlock(&conn->chan_lock);
1296 /* Find socket with cid and source/destination bdaddr.
1297 * Returns closest match, locked.
1299 static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid,
1303 struct l2cap_chan *c, *c1 = NULL;
1305 read_lock(&chan_list_lock);
1307 list_for_each_entry(c, &chan_list, global_l) {
1308 struct sock *sk = c->sk;
1310 if (state && c->state != state)
1313 if (c->scid == cid) {
1314 int src_match, dst_match;
1315 int src_any, dst_any;
1318 src_match = !bacmp(&bt_sk(sk)->src, src);
1319 dst_match = !bacmp(&bt_sk(sk)->dst, dst);
1320 if (src_match && dst_match) {
1321 read_unlock(&chan_list_lock);
1326 src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY);
1327 dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY);
1328 if ((src_match && dst_any) || (src_any && dst_match) ||
1329 (src_any && dst_any))
1334 read_unlock(&chan_list_lock);
1339 static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1341 struct sock *parent, *sk;
1342 struct l2cap_chan *chan, *pchan;
1346 /* Check if we have socket listening on cid */
1347 pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA,
1348 conn->src, conn->dst);
1356 chan = pchan->ops->new_connection(pchan);
1362 hci_conn_hold(conn->hcon);
1363 conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT;
1365 bacpy(&bt_sk(sk)->src, conn->src);
1366 bacpy(&bt_sk(sk)->dst, conn->dst);
1368 l2cap_chan_add(conn, chan);
1370 l2cap_chan_ready(chan);
1373 release_sock(parent);
1376 static void l2cap_conn_ready(struct l2cap_conn *conn)
1378 struct l2cap_chan *chan;
1379 struct hci_conn *hcon = conn->hcon;
1381 BT_DBG("conn %p", conn);
1383 if (!hcon->out && hcon->type == LE_LINK)
1384 l2cap_le_conn_ready(conn);
1386 if (hcon->out && hcon->type == LE_LINK)
1387 smp_conn_security(hcon, hcon->pending_sec_level);
1389 mutex_lock(&conn->chan_lock);
1391 list_for_each_entry(chan, &conn->chan_l, list) {
1393 l2cap_chan_lock(chan);
1395 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
1396 l2cap_chan_unlock(chan);
1400 if (hcon->type == LE_LINK) {
1401 if (smp_conn_security(hcon, chan->sec_level))
1402 l2cap_chan_ready(chan);
1404 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
1405 struct sock *sk = chan->sk;
1406 __clear_chan_timer(chan);
1408 __l2cap_state_change(chan, BT_CONNECTED);
1409 sk->sk_state_change(sk);
1412 } else if (chan->state == BT_CONNECT)
1413 l2cap_do_start(chan);
1415 l2cap_chan_unlock(chan);
1418 mutex_unlock(&conn->chan_lock);
1421 /* Notify sockets that we cannot guaranty reliability anymore */
1422 static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1424 struct l2cap_chan *chan;
1426 BT_DBG("conn %p", conn);
1428 mutex_lock(&conn->chan_lock);
1430 list_for_each_entry(chan, &conn->chan_l, list) {
1431 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
1432 l2cap_chan_set_err(chan, err);
1435 mutex_unlock(&conn->chan_lock);
1438 static void l2cap_info_timeout(struct work_struct *work)
1440 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
1443 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
1444 conn->info_ident = 0;
1446 l2cap_conn_start(conn);
1451 * External modules can register l2cap_user objects on l2cap_conn. The ->probe
1452 * callback is called during registration. The ->remove callback is called
1453 * during unregistration.
1454 * An l2cap_user object can either be explicitly unregistered or when the
1455 * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon,
1456 * l2cap->hchan, .. are valid as long as the remove callback hasn't been called.
1457 * External modules must own a reference to the l2cap_conn object if they intend
1458 * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at
1459 * any time if they don't.
1462 int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user)
1464 struct hci_dev *hdev = conn->hcon->hdev;
1467 /* We need to check whether l2cap_conn is registered. If it is not, we
1468 * must not register the l2cap_user. l2cap_conn_del() is unregisters
1469 * l2cap_conn objects, but doesn't provide its own locking. Instead, it
1470 * relies on the parent hci_conn object to be locked. This itself relies
1471 * on the hci_dev object to be locked. So we must lock the hci device
1476 if (user->list.next || user->list.prev) {
1481 /* conn->hchan is NULL after l2cap_conn_del() was called */
1487 ret = user->probe(conn, user);
1491 list_add(&user->list, &conn->users);
1495 hci_dev_unlock(hdev);
1498 EXPORT_SYMBOL(l2cap_register_user);
1500 void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user)
1502 struct hci_dev *hdev = conn->hcon->hdev;
1506 if (!user->list.next || !user->list.prev)
1509 list_del(&user->list);
1510 user->list.next = NULL;
1511 user->list.prev = NULL;
1512 user->remove(conn, user);
1515 hci_dev_unlock(hdev);
1517 EXPORT_SYMBOL(l2cap_unregister_user);
1519 static void l2cap_unregister_all_users(struct l2cap_conn *conn)
1521 struct l2cap_user *user;
1523 while (!list_empty(&conn->users)) {
1524 user = list_first_entry(&conn->users, struct l2cap_user, list);
1525 list_del(&user->list);
1526 user->list.next = NULL;
1527 user->list.prev = NULL;
1528 user->remove(conn, user);
1532 static void l2cap_conn_del(struct hci_conn *hcon, int err)
1534 struct l2cap_conn *conn = hcon->l2cap_data;
1535 struct l2cap_chan *chan, *l;
1540 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1542 kfree_skb(conn->rx_skb);
1544 l2cap_unregister_all_users(conn);
1546 mutex_lock(&conn->chan_lock);
1549 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
1550 l2cap_chan_hold(chan);
1551 l2cap_chan_lock(chan);
1553 l2cap_chan_del(chan, err);
1555 l2cap_chan_unlock(chan);
1557 chan->ops->close(chan);
1558 l2cap_chan_put(chan);
1561 mutex_unlock(&conn->chan_lock);
1563 hci_chan_del(conn->hchan);
1565 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
1566 cancel_delayed_work_sync(&conn->info_timer);
1568 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) {
1569 cancel_delayed_work_sync(&conn->security_timer);
1570 smp_chan_destroy(conn);
1573 hcon->l2cap_data = NULL;
1575 l2cap_conn_put(conn);
1578 static void security_timeout(struct work_struct *work)
1580 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
1581 security_timer.work);
1583 BT_DBG("conn %p", conn);
1585 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) {
1586 smp_chan_destroy(conn);
1587 l2cap_conn_del(conn->hcon, ETIMEDOUT);
1591 static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
1593 struct l2cap_conn *conn = hcon->l2cap_data;
1594 struct hci_chan *hchan;
1599 hchan = hci_chan_create(hcon);
1603 conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL);
1605 hci_chan_del(hchan);
1609 kref_init(&conn->ref);
1610 hcon->l2cap_data = conn;
1612 hci_conn_get(conn->hcon);
1613 conn->hchan = hchan;
1615 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
1617 switch (hcon->type) {
1619 if (hcon->hdev->le_mtu) {
1620 conn->mtu = hcon->hdev->le_mtu;
1625 conn->mtu = hcon->hdev->acl_mtu;
1629 conn->src = &hcon->hdev->bdaddr;
1630 conn->dst = &hcon->dst;
1632 conn->feat_mask = 0;
1634 spin_lock_init(&conn->lock);
1635 mutex_init(&conn->chan_lock);
1637 INIT_LIST_HEAD(&conn->chan_l);
1638 INIT_LIST_HEAD(&conn->users);
1640 if (hcon->type == LE_LINK)
1641 INIT_DELAYED_WORK(&conn->security_timer, security_timeout);
1643 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
1645 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
1650 static void l2cap_conn_free(struct kref *ref)
1652 struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref);
1654 hci_conn_put(conn->hcon);
1658 void l2cap_conn_get(struct l2cap_conn *conn)
1660 kref_get(&conn->ref);
1662 EXPORT_SYMBOL(l2cap_conn_get);
1664 void l2cap_conn_put(struct l2cap_conn *conn)
1666 kref_put(&conn->ref, l2cap_conn_free);
1668 EXPORT_SYMBOL(l2cap_conn_put);
1670 /* ---- Socket interface ---- */
1672 /* Find socket with psm and source / destination bdaddr.
1673 * Returns closest match.
1675 static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1679 struct l2cap_chan *c, *c1 = NULL;
1681 read_lock(&chan_list_lock);
1683 list_for_each_entry(c, &chan_list, global_l) {
1684 struct sock *sk = c->sk;
1686 if (state && c->state != state)
1689 if (c->psm == psm) {
1690 int src_match, dst_match;
1691 int src_any, dst_any;
1694 src_match = !bacmp(&bt_sk(sk)->src, src);
1695 dst_match = !bacmp(&bt_sk(sk)->dst, dst);
1696 if (src_match && dst_match) {
1697 read_unlock(&chan_list_lock);
1702 src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY);
1703 dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY);
1704 if ((src_match && dst_any) || (src_any && dst_match) ||
1705 (src_any && dst_any))
1710 read_unlock(&chan_list_lock);
1715 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
1716 bdaddr_t *dst, u8 dst_type)
1718 struct sock *sk = chan->sk;
1719 bdaddr_t *src = &bt_sk(sk)->src;
1720 struct l2cap_conn *conn;
1721 struct hci_conn *hcon;
1722 struct hci_dev *hdev;
1726 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", src, dst,
1727 dst_type, __le16_to_cpu(psm));
1729 hdev = hci_get_route(dst, src);
1731 return -EHOSTUNREACH;
1735 l2cap_chan_lock(chan);
1737 /* PSM must be odd and lsb of upper byte must be 0 */
1738 if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid &&
1739 chan->chan_type != L2CAP_CHAN_RAW) {
1744 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) {
1749 switch (chan->mode) {
1750 case L2CAP_MODE_BASIC:
1752 case L2CAP_MODE_ERTM:
1753 case L2CAP_MODE_STREAMING:
1762 switch (chan->state) {
1766 /* Already connecting */
1771 /* Already connected */
1785 /* Set destination address and psm */
1787 bacpy(&bt_sk(sk)->dst, dst);
1793 auth_type = l2cap_get_auth_type(chan);
1795 if (chan->dcid == L2CAP_CID_LE_DATA)
1796 hcon = hci_connect(hdev, LE_LINK, dst, dst_type,
1797 chan->sec_level, auth_type);
1799 hcon = hci_connect(hdev, ACL_LINK, dst, dst_type,
1800 chan->sec_level, auth_type);
1803 err = PTR_ERR(hcon);
1807 conn = l2cap_conn_add(hcon);
1809 hci_conn_drop(hcon);
1814 if (hcon->type == LE_LINK) {
1817 if (!list_empty(&conn->chan_l)) {
1819 hci_conn_drop(hcon);
1826 /* Update source addr of the socket */
1827 bacpy(src, conn->src);
1829 l2cap_chan_unlock(chan);
1830 l2cap_chan_add(conn, chan);
1831 l2cap_chan_lock(chan);
1833 l2cap_state_change(chan, BT_CONNECT);
1834 __set_chan_timer(chan, sk->sk_sndtimeo);
1836 if (hcon->state == BT_CONNECTED) {
1837 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
1838 __clear_chan_timer(chan);
1839 if (l2cap_chan_check_security(chan))
1840 l2cap_state_change(chan, BT_CONNECTED);
1842 l2cap_do_start(chan);
1848 l2cap_chan_unlock(chan);
1849 hci_dev_unlock(hdev);
1854 int __l2cap_wait_ack(struct sock *sk)
1856 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1857 DECLARE_WAITQUEUE(wait, current);
1861 add_wait_queue(sk_sleep(sk), &wait);
1862 set_current_state(TASK_INTERRUPTIBLE);
1863 while (chan->unacked_frames > 0 && chan->conn) {
1867 if (signal_pending(current)) {
1868 err = sock_intr_errno(timeo);
1873 timeo = schedule_timeout(timeo);
1875 set_current_state(TASK_INTERRUPTIBLE);
1877 err = sock_error(sk);
1881 set_current_state(TASK_RUNNING);
1882 remove_wait_queue(sk_sleep(sk), &wait);
1886 static void l2cap_monitor_timeout(struct work_struct *work)
1888 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
1889 monitor_timer.work);
1891 BT_DBG("chan %p", chan);
1893 l2cap_chan_lock(chan);
1896 l2cap_chan_unlock(chan);
1897 l2cap_chan_put(chan);
1901 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
1903 l2cap_chan_unlock(chan);
1904 l2cap_chan_put(chan);
1907 static void l2cap_retrans_timeout(struct work_struct *work)
1909 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
1910 retrans_timer.work);
1912 BT_DBG("chan %p", chan);
1914 l2cap_chan_lock(chan);
1917 l2cap_chan_unlock(chan);
1918 l2cap_chan_put(chan);
1922 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
1923 l2cap_chan_unlock(chan);
1924 l2cap_chan_put(chan);
1927 static void l2cap_streaming_send(struct l2cap_chan *chan,
1928 struct sk_buff_head *skbs)
1930 struct sk_buff *skb;
1931 struct l2cap_ctrl *control;
1933 BT_DBG("chan %p, skbs %p", chan, skbs);
1935 if (__chan_is_moving(chan))
1938 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1940 while (!skb_queue_empty(&chan->tx_q)) {
1942 skb = skb_dequeue(&chan->tx_q);
1944 bt_cb(skb)->control.retries = 1;
1945 control = &bt_cb(skb)->control;
1947 control->reqseq = 0;
1948 control->txseq = chan->next_tx_seq;
1950 __pack_control(chan, control, skb);
1952 if (chan->fcs == L2CAP_FCS_CRC16) {
1953 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1954 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
1957 l2cap_do_send(chan, skb);
1959 BT_DBG("Sent txseq %u", control->txseq);
1961 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
1962 chan->frames_sent++;
1966 static int l2cap_ertm_send(struct l2cap_chan *chan)
1968 struct sk_buff *skb, *tx_skb;
1969 struct l2cap_ctrl *control;
1972 BT_DBG("chan %p", chan);
1974 if (chan->state != BT_CONNECTED)
1977 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1980 if (__chan_is_moving(chan))
1983 while (chan->tx_send_head &&
1984 chan->unacked_frames < chan->remote_tx_win &&
1985 chan->tx_state == L2CAP_TX_STATE_XMIT) {
1987 skb = chan->tx_send_head;
1989 bt_cb(skb)->control.retries = 1;
1990 control = &bt_cb(skb)->control;
1992 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1995 control->reqseq = chan->buffer_seq;
1996 chan->last_acked_seq = chan->buffer_seq;
1997 control->txseq = chan->next_tx_seq;
1999 __pack_control(chan, control, skb);
2001 if (chan->fcs == L2CAP_FCS_CRC16) {
2002 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
2003 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
2006 /* Clone after data has been modified. Data is assumed to be
2007 read-only (for locking purposes) on cloned sk_buffs.
2009 tx_skb = skb_clone(skb, GFP_KERNEL);
2014 __set_retrans_timer(chan);
2016 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
2017 chan->unacked_frames++;
2018 chan->frames_sent++;
2021 if (skb_queue_is_last(&chan->tx_q, skb))
2022 chan->tx_send_head = NULL;
2024 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
2026 l2cap_do_send(chan, tx_skb);
2027 BT_DBG("Sent txseq %u", control->txseq);
2030 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
2031 chan->unacked_frames, skb_queue_len(&chan->tx_q));
2036 static void l2cap_ertm_resend(struct l2cap_chan *chan)
2038 struct l2cap_ctrl control;
2039 struct sk_buff *skb;
2040 struct sk_buff *tx_skb;
2043 BT_DBG("chan %p", chan);
2045 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2048 if (__chan_is_moving(chan))
2051 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
2052 seq = l2cap_seq_list_pop(&chan->retrans_list);
2054 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
2056 BT_DBG("Error: Can't retransmit seq %d, frame missing",
2061 bt_cb(skb)->control.retries++;
2062 control = bt_cb(skb)->control;
2064 if (chan->max_tx != 0 &&
2065 bt_cb(skb)->control.retries > chan->max_tx) {
2066 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
2067 l2cap_send_disconn_req(chan, ECONNRESET);
2068 l2cap_seq_list_clear(&chan->retrans_list);
2072 control.reqseq = chan->buffer_seq;
2073 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
2078 if (skb_cloned(skb)) {
2079 /* Cloned sk_buffs are read-only, so we need a
2082 tx_skb = skb_copy(skb, GFP_KERNEL);
2084 tx_skb = skb_clone(skb, GFP_KERNEL);
2088 l2cap_seq_list_clear(&chan->retrans_list);
2092 /* Update skb contents */
2093 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
2094 put_unaligned_le32(__pack_extended_control(&control),
2095 tx_skb->data + L2CAP_HDR_SIZE);
2097 put_unaligned_le16(__pack_enhanced_control(&control),
2098 tx_skb->data + L2CAP_HDR_SIZE);
2101 if (chan->fcs == L2CAP_FCS_CRC16) {
2102 u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len);
2103 put_unaligned_le16(fcs, skb_put(tx_skb,
2107 l2cap_do_send(chan, tx_skb);
2109 BT_DBG("Resent txseq %d", control.txseq);
2111 chan->last_acked_seq = chan->buffer_seq;
2115 static void l2cap_retransmit(struct l2cap_chan *chan,
2116 struct l2cap_ctrl *control)
2118 BT_DBG("chan %p, control %p", chan, control);
2120 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
2121 l2cap_ertm_resend(chan);
2124 static void l2cap_retransmit_all(struct l2cap_chan *chan,
2125 struct l2cap_ctrl *control)
2127 struct sk_buff *skb;
2129 BT_DBG("chan %p, control %p", chan, control);
2132 set_bit(CONN_SEND_FBIT, &chan->conn_state);
2134 l2cap_seq_list_clear(&chan->retrans_list);
2136 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2139 if (chan->unacked_frames) {
2140 skb_queue_walk(&chan->tx_q, skb) {
2141 if (bt_cb(skb)->control.txseq == control->reqseq ||
2142 skb == chan->tx_send_head)
2146 skb_queue_walk_from(&chan->tx_q, skb) {
2147 if (skb == chan->tx_send_head)
2150 l2cap_seq_list_append(&chan->retrans_list,
2151 bt_cb(skb)->control.txseq);
2154 l2cap_ertm_resend(chan);
2158 static void l2cap_send_ack(struct l2cap_chan *chan)
2160 struct l2cap_ctrl control;
2161 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2162 chan->last_acked_seq);
2165 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
2166 chan, chan->last_acked_seq, chan->buffer_seq);
2168 memset(&control, 0, sizeof(control));
2171 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
2172 chan->rx_state == L2CAP_RX_STATE_RECV) {
2173 __clear_ack_timer(chan);
2174 control.super = L2CAP_SUPER_RNR;
2175 control.reqseq = chan->buffer_seq;
2176 l2cap_send_sframe(chan, &control);
2178 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
2179 l2cap_ertm_send(chan);
2180 /* If any i-frames were sent, they included an ack */
2181 if (chan->buffer_seq == chan->last_acked_seq)
2185 /* Ack now if the window is 3/4ths full.
2186 * Calculate without mul or div
2188 threshold = chan->ack_win;
2189 threshold += threshold << 1;
2192 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
2195 if (frames_to_ack >= threshold) {
2196 __clear_ack_timer(chan);
2197 control.super = L2CAP_SUPER_RR;
2198 control.reqseq = chan->buffer_seq;
2199 l2cap_send_sframe(chan, &control);
2204 __set_ack_timer(chan);
2208 static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
2209 struct msghdr *msg, int len,
2210 int count, struct sk_buff *skb)
2212 struct l2cap_conn *conn = chan->conn;
2213 struct sk_buff **frag;
2216 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
2222 /* Continuation fragments (no L2CAP header) */
2223 frag = &skb_shinfo(skb)->frag_list;
2225 struct sk_buff *tmp;
2227 count = min_t(unsigned int, conn->mtu, len);
2229 tmp = chan->ops->alloc_skb(chan, count,
2230 msg->msg_flags & MSG_DONTWAIT);
2232 return PTR_ERR(tmp);
2236 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
2239 (*frag)->priority = skb->priority;
2244 skb->len += (*frag)->len;
2245 skb->data_len += (*frag)->len;
2247 frag = &(*frag)->next;
2253 static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
2254 struct msghdr *msg, size_t len,
2257 struct l2cap_conn *conn = chan->conn;
2258 struct sk_buff *skb;
2259 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
2260 struct l2cap_hdr *lh;
2262 BT_DBG("chan %p len %zu priority %u", chan, len, priority);
2264 count = min_t(unsigned int, (conn->mtu - hlen), len);
2266 skb = chan->ops->alloc_skb(chan, count + hlen,
2267 msg->msg_flags & MSG_DONTWAIT);
2271 skb->priority = priority;
2273 /* Create L2CAP header */
2274 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2275 lh->cid = cpu_to_le16(chan->dcid);
2276 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
2277 put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE));
2279 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2280 if (unlikely(err < 0)) {
2282 return ERR_PTR(err);
2287 static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
2288 struct msghdr *msg, size_t len,
2291 struct l2cap_conn *conn = chan->conn;
2292 struct sk_buff *skb;
2294 struct l2cap_hdr *lh;
2296 BT_DBG("chan %p len %zu", chan, len);
2298 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2300 skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE,
2301 msg->msg_flags & MSG_DONTWAIT);
2305 skb->priority = priority;
2307 /* Create L2CAP header */
2308 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2309 lh->cid = cpu_to_le16(chan->dcid);
2310 lh->len = cpu_to_le16(len);
2312 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2313 if (unlikely(err < 0)) {
2315 return ERR_PTR(err);
2320 static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
2321 struct msghdr *msg, size_t len,
2324 struct l2cap_conn *conn = chan->conn;
2325 struct sk_buff *skb;
2326 int err, count, hlen;
2327 struct l2cap_hdr *lh;
2329 BT_DBG("chan %p len %zu", chan, len);
2332 return ERR_PTR(-ENOTCONN);
2334 hlen = __ertm_hdr_size(chan);
2337 hlen += L2CAP_SDULEN_SIZE;
2339 if (chan->fcs == L2CAP_FCS_CRC16)
2340 hlen += L2CAP_FCS_SIZE;
2342 count = min_t(unsigned int, (conn->mtu - hlen), len);
2344 skb = chan->ops->alloc_skb(chan, count + hlen,
2345 msg->msg_flags & MSG_DONTWAIT);
2349 /* Create L2CAP header */
2350 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2351 lh->cid = cpu_to_le16(chan->dcid);
2352 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
2354 /* Control header is populated later */
2355 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2356 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2358 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
2361 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
2363 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2364 if (unlikely(err < 0)) {
2366 return ERR_PTR(err);
2369 bt_cb(skb)->control.fcs = chan->fcs;
2370 bt_cb(skb)->control.retries = 0;
2374 static int l2cap_segment_sdu(struct l2cap_chan *chan,
2375 struct sk_buff_head *seg_queue,
2376 struct msghdr *msg, size_t len)
2378 struct sk_buff *skb;
2383 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
2385 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2386 * so fragmented skbs are not used. The HCI layer's handling
2387 * of fragmented skbs is not compatible with ERTM's queueing.
2390 /* PDU size is derived from the HCI MTU */
2391 pdu_len = chan->conn->mtu;
2393 /* Constrain PDU size for BR/EDR connections */
2395 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
2397 /* Adjust for largest possible L2CAP overhead. */
2399 pdu_len -= L2CAP_FCS_SIZE;
2401 pdu_len -= __ertm_hdr_size(chan);
2403 /* Remote device may have requested smaller PDUs */
2404 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2406 if (len <= pdu_len) {
2407 sar = L2CAP_SAR_UNSEGMENTED;
2411 sar = L2CAP_SAR_START;
2413 pdu_len -= L2CAP_SDULEN_SIZE;
2417 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
2420 __skb_queue_purge(seg_queue);
2421 return PTR_ERR(skb);
2424 bt_cb(skb)->control.sar = sar;
2425 __skb_queue_tail(seg_queue, skb);
2430 pdu_len += L2CAP_SDULEN_SIZE;
2433 if (len <= pdu_len) {
2434 sar = L2CAP_SAR_END;
2437 sar = L2CAP_SAR_CONTINUE;
2444 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;
2451 /* Connectionless channel */
2452 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
2453 skb = l2cap_create_connless_pdu(chan, msg, len, priority);
2455 return PTR_ERR(skb);
2457 l2cap_do_send(chan, skb);
2461 switch (chan->mode) {
2462 case L2CAP_MODE_BASIC:
2463 /* Check outgoing MTU */
2464 if (len > chan->omtu)
2467 /* Create a basic PDU */
2468 skb = l2cap_create_basic_pdu(chan, msg, len, priority);
2470 return PTR_ERR(skb);
2472 l2cap_do_send(chan, skb);
2476 case L2CAP_MODE_ERTM:
2477 case L2CAP_MODE_STREAMING:
2478 /* Check outgoing MTU */
2479 if (len > chan->omtu) {
2484 __skb_queue_head_init(&seg_queue);
2486 /* Do segmentation before calling in to the state machine,
2487 * since it's possible to block while waiting for memory
2490 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
2492 /* The channel could have been closed while segmenting,
2493 * check that it is still connected.
2495 if (chan->state != BT_CONNECTED) {
2496 __skb_queue_purge(&seg_queue);
2503 if (chan->mode == L2CAP_MODE_ERTM)
2504 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
2506 l2cap_streaming_send(chan, &seg_queue);
2510 /* If the skbs were not queued for sending, they'll still be in
2511 * seg_queue and need to be purged.
2513 __skb_queue_purge(&seg_queue);
2517 BT_DBG("bad state %1.1x", chan->mode);
2524 static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2526 struct l2cap_ctrl control;
2529 BT_DBG("chan %p, txseq %u", chan, txseq);
2531 memset(&control, 0, sizeof(control));
2533 control.super = L2CAP_SUPER_SREJ;
2535 for (seq = chan->expected_tx_seq; seq != txseq;
2536 seq = __next_seq(chan, seq)) {
2537 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2538 control.reqseq = seq;
2539 l2cap_send_sframe(chan, &control);
2540 l2cap_seq_list_append(&chan->srej_list, seq);
2544 chan->expected_tx_seq = __next_seq(chan, txseq);
2547 static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2549 struct l2cap_ctrl control;
2551 BT_DBG("chan %p", chan);
2553 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2556 memset(&control, 0, sizeof(control));
2558 control.super = L2CAP_SUPER_SREJ;
2559 control.reqseq = chan->srej_list.tail;
2560 l2cap_send_sframe(chan, &control);
2563 static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2565 struct l2cap_ctrl control;
2569 BT_DBG("chan %p, txseq %u", chan, txseq);
2571 memset(&control, 0, sizeof(control));
2573 control.super = L2CAP_SUPER_SREJ;
2575 /* Capture initial list head to allow only one pass through the list. */
2576 initial_head = chan->srej_list.head;
2579 seq = l2cap_seq_list_pop(&chan->srej_list);
2580 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2583 control.reqseq = seq;
2584 l2cap_send_sframe(chan, &control);
2585 l2cap_seq_list_append(&chan->srej_list, seq);
2586 } while (chan->srej_list.head != initial_head);
2589 static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2591 struct sk_buff *acked_skb;
2594 BT_DBG("chan %p, reqseq %u", chan, reqseq);
2596 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2599 BT_DBG("expected_ack_seq %u, unacked_frames %u",
2600 chan->expected_ack_seq, chan->unacked_frames);
2602 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2603 ackseq = __next_seq(chan, ackseq)) {
2605 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2607 skb_unlink(acked_skb, &chan->tx_q);
2608 kfree_skb(acked_skb);
2609 chan->unacked_frames--;
2613 chan->expected_ack_seq = reqseq;
2615 if (chan->unacked_frames == 0)
2616 __clear_retrans_timer(chan);
2618 BT_DBG("unacked_frames %u", chan->unacked_frames);
2621 static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2623 BT_DBG("chan %p", chan);
2625 chan->expected_tx_seq = chan->buffer_seq;
2626 l2cap_seq_list_clear(&chan->srej_list);
2627 skb_queue_purge(&chan->srej_q);
2628 chan->rx_state = L2CAP_RX_STATE_RECV;
2631 static void l2cap_tx_state_xmit(struct l2cap_chan *chan,
2632 struct l2cap_ctrl *control,
2633 struct sk_buff_head *skbs, u8 event)
2635 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2639 case L2CAP_EV_DATA_REQUEST:
2640 if (chan->tx_send_head == NULL)
2641 chan->tx_send_head = skb_peek(skbs);
2643 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2644 l2cap_ertm_send(chan);
2646 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2647 BT_DBG("Enter LOCAL_BUSY");
2648 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2650 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2651 /* The SREJ_SENT state must be aborted if we are to
2652 * enter the LOCAL_BUSY state.
2654 l2cap_abort_rx_srej_sent(chan);
2657 l2cap_send_ack(chan);
2660 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2661 BT_DBG("Exit LOCAL_BUSY");
2662 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2664 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2665 struct l2cap_ctrl local_control;
2667 memset(&local_control, 0, sizeof(local_control));
2668 local_control.sframe = 1;
2669 local_control.super = L2CAP_SUPER_RR;
2670 local_control.poll = 1;
2671 local_control.reqseq = chan->buffer_seq;
2672 l2cap_send_sframe(chan, &local_control);
2674 chan->retry_count = 1;
2675 __set_monitor_timer(chan);
2676 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2679 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2680 l2cap_process_reqseq(chan, control->reqseq);
2682 case L2CAP_EV_EXPLICIT_POLL:
2683 l2cap_send_rr_or_rnr(chan, 1);
2684 chan->retry_count = 1;
2685 __set_monitor_timer(chan);
2686 __clear_ack_timer(chan);
2687 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2689 case L2CAP_EV_RETRANS_TO:
2690 l2cap_send_rr_or_rnr(chan, 1);
2691 chan->retry_count = 1;
2692 __set_monitor_timer(chan);
2693 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2695 case L2CAP_EV_RECV_FBIT:
2696 /* Nothing to process */
2703 static void l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2704 struct l2cap_ctrl *control,
2705 struct sk_buff_head *skbs, u8 event)
2707 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2711 case L2CAP_EV_DATA_REQUEST:
2712 if (chan->tx_send_head == NULL)
2713 chan->tx_send_head = skb_peek(skbs);
2714 /* Queue data, but don't send. */
2715 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2717 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2718 BT_DBG("Enter LOCAL_BUSY");
2719 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2721 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2722 /* The SREJ_SENT state must be aborted if we are to
2723 * enter the LOCAL_BUSY state.
2725 l2cap_abort_rx_srej_sent(chan);
2728 l2cap_send_ack(chan);
2731 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2732 BT_DBG("Exit LOCAL_BUSY");
2733 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2735 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2736 struct l2cap_ctrl local_control;
2737 memset(&local_control, 0, sizeof(local_control));
2738 local_control.sframe = 1;
2739 local_control.super = L2CAP_SUPER_RR;
2740 local_control.poll = 1;
2741 local_control.reqseq = chan->buffer_seq;
2742 l2cap_send_sframe(chan, &local_control);
2744 chan->retry_count = 1;
2745 __set_monitor_timer(chan);
2746 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2749 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2750 l2cap_process_reqseq(chan, control->reqseq);
2754 case L2CAP_EV_RECV_FBIT:
2755 if (control && control->final) {
2756 __clear_monitor_timer(chan);
2757 if (chan->unacked_frames > 0)
2758 __set_retrans_timer(chan);
2759 chan->retry_count = 0;
2760 chan->tx_state = L2CAP_TX_STATE_XMIT;
2761 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2764 case L2CAP_EV_EXPLICIT_POLL:
2767 case L2CAP_EV_MONITOR_TO:
2768 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2769 l2cap_send_rr_or_rnr(chan, 1);
2770 __set_monitor_timer(chan);
2771 chan->retry_count++;
2773 l2cap_send_disconn_req(chan, ECONNABORTED);
2781 static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2782 struct sk_buff_head *skbs, u8 event)
2784 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2785 chan, control, skbs, event, chan->tx_state);
2787 switch (chan->tx_state) {
2788 case L2CAP_TX_STATE_XMIT:
2789 l2cap_tx_state_xmit(chan, control, skbs, event);
2791 case L2CAP_TX_STATE_WAIT_F:
2792 l2cap_tx_state_wait_f(chan, control, skbs, event);
2800 static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2801 struct l2cap_ctrl *control)
2803 BT_DBG("chan %p, control %p", chan, control);
2804 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
2807 static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2808 struct l2cap_ctrl *control)
2810 BT_DBG("chan %p, control %p", chan, control);
2811 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT);
2814 /* Copy frame to all raw sockets on that connection */
2815 static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2817 struct sk_buff *nskb;
2818 struct l2cap_chan *chan;
2820 BT_DBG("conn %p", conn);
2822 mutex_lock(&conn->chan_lock);
2824 list_for_each_entry(chan, &conn->chan_l, list) {
2825 struct sock *sk = chan->sk;
2826 if (chan->chan_type != L2CAP_CHAN_RAW)
2829 /* Don't send frame to the socket it came from */
2832 nskb = skb_clone(skb, GFP_KERNEL);
2836 if (chan->ops->recv(chan, nskb))
2840 mutex_unlock(&conn->chan_lock);
2843 /* ---- L2CAP signalling commands ---- */
2844 static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
2845 u8 ident, u16 dlen, void *data)
2847 struct sk_buff *skb, **frag;
2848 struct l2cap_cmd_hdr *cmd;
2849 struct l2cap_hdr *lh;
2852 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
2853 conn, code, ident, dlen);
2855 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2856 count = min_t(unsigned int, conn->mtu, len);
2858 skb = bt_skb_alloc(count, GFP_KERNEL);
2862 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2863 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
2865 if (conn->hcon->type == LE_LINK)
2866 lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING);
2868 lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING);
2870 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2873 cmd->len = cpu_to_le16(dlen);
2876 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2877 memcpy(skb_put(skb, count), data, count);
2883 /* Continuation fragments (no L2CAP header) */
2884 frag = &skb_shinfo(skb)->frag_list;
2886 count = min_t(unsigned int, conn->mtu, len);
2888 *frag = bt_skb_alloc(count, GFP_KERNEL);
2892 memcpy(skb_put(*frag, count), data, count);
2897 frag = &(*frag)->next;
2907 static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
2910 struct l2cap_conf_opt *opt = *ptr;
2913 len = L2CAP_CONF_OPT_SIZE + opt->len;
2921 *val = *((u8 *) opt->val);
2925 *val = get_unaligned_le16(opt->val);
2929 *val = get_unaligned_le32(opt->val);
2933 *val = (unsigned long) opt->val;
2937 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
2941 static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2943 struct l2cap_conf_opt *opt = *ptr;
2945 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
2952 *((u8 *) opt->val) = val;
2956 put_unaligned_le16(val, opt->val);
2960 put_unaligned_le32(val, opt->val);
2964 memcpy(opt->val, (void *) val, len);
2968 *ptr += L2CAP_CONF_OPT_SIZE + len;
2971 static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
2973 struct l2cap_conf_efs efs;
2975 switch (chan->mode) {
2976 case L2CAP_MODE_ERTM:
2977 efs.id = chan->local_id;
2978 efs.stype = chan->local_stype;
2979 efs.msdu = cpu_to_le16(chan->local_msdu);
2980 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
2981 efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
2982 efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO);
2985 case L2CAP_MODE_STREAMING:
2987 efs.stype = L2CAP_SERV_BESTEFFORT;
2988 efs.msdu = cpu_to_le16(chan->local_msdu);
2989 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
2998 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
2999 (unsigned long) &efs);
3002 static void l2cap_ack_timeout(struct work_struct *work)
3004 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
3008 BT_DBG("chan %p", chan);
3010 l2cap_chan_lock(chan);
3012 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
3013 chan->last_acked_seq);
3016 l2cap_send_rr_or_rnr(chan, 0);
3018 l2cap_chan_unlock(chan);
3019 l2cap_chan_put(chan);
3022 int l2cap_ertm_init(struct l2cap_chan *chan)
3026 chan->next_tx_seq = 0;
3027 chan->expected_tx_seq = 0;
3028 chan->expected_ack_seq = 0;
3029 chan->unacked_frames = 0;
3030 chan->buffer_seq = 0;
3031 chan->frames_sent = 0;
3032 chan->last_acked_seq = 0;
3034 chan->sdu_last_frag = NULL;
3037 skb_queue_head_init(&chan->tx_q);
3039 chan->local_amp_id = 0;
3041 chan->move_state = L2CAP_MOVE_STABLE;
3042 chan->move_role = L2CAP_MOVE_ROLE_NONE;
3044 if (chan->mode != L2CAP_MODE_ERTM)
3047 chan->rx_state = L2CAP_RX_STATE_RECV;
3048 chan->tx_state = L2CAP_TX_STATE_XMIT;
3050 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
3051 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
3052 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
3054 skb_queue_head_init(&chan->srej_q);
3056 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
3060 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
3062 l2cap_seq_list_free(&chan->srej_list);
3067 static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
3070 case L2CAP_MODE_STREAMING:
3071 case L2CAP_MODE_ERTM:
3072 if (l2cap_mode_supported(mode, remote_feat_mask))
3076 return L2CAP_MODE_BASIC;
3080 static inline bool __l2cap_ews_supported(struct l2cap_chan *chan)
3082 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
3085 static inline bool __l2cap_efs_supported(struct l2cap_chan *chan)
3087 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
3090 static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
3091 struct l2cap_conf_rfc *rfc)
3093 if (chan->local_amp_id && chan->hs_hcon) {
3094 u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to;
3096 /* Class 1 devices have must have ERTM timeouts
3097 * exceeding the Link Supervision Timeout. The
3098 * default Link Supervision Timeout for AMP
3099 * controllers is 10 seconds.
3101 * Class 1 devices use 0xffffffff for their
3102 * best-effort flush timeout, so the clamping logic
3103 * will result in a timeout that meets the above
3104 * requirement. ERTM timeouts are 16-bit values, so
3105 * the maximum timeout is 65.535 seconds.
3108 /* Convert timeout to milliseconds and round */
3109 ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000);
3111 /* This is the recommended formula for class 2 devices
3112 * that start ERTM timers when packets are sent to the
3115 ertm_to = 3 * ertm_to + 500;
3117 if (ertm_to > 0xffff)
3120 rfc->retrans_timeout = cpu_to_le16((u16) ertm_to);
3121 rfc->monitor_timeout = rfc->retrans_timeout;
3123 rfc->retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3124 rfc->monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
3128 static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
3130 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
3131 __l2cap_ews_supported(chan)) {
3132 /* use extended control field */
3133 set_bit(FLAG_EXT_CTRL, &chan->flags);
3134 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3136 chan->tx_win = min_t(u16, chan->tx_win,
3137 L2CAP_DEFAULT_TX_WINDOW);
3138 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
3140 chan->ack_win = chan->tx_win;
3143 static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
3145 struct l2cap_conf_req *req = data;
3146 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
3147 void *ptr = req->data;
3150 BT_DBG("chan %p", chan);
3152 if (chan->num_conf_req || chan->num_conf_rsp)
3155 switch (chan->mode) {
3156 case L2CAP_MODE_STREAMING:
3157 case L2CAP_MODE_ERTM:
3158 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
3161 if (__l2cap_efs_supported(chan))
3162 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3166 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
3171 if (chan->imtu != L2CAP_DEFAULT_MTU)
3172 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
3174 switch (chan->mode) {
3175 case L2CAP_MODE_BASIC:
3176 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
3177 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
3180 rfc.mode = L2CAP_MODE_BASIC;
3182 rfc.max_transmit = 0;
3183 rfc.retrans_timeout = 0;
3184 rfc.monitor_timeout = 0;
3185 rfc.max_pdu_size = 0;
3187 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3188 (unsigned long) &rfc);
3191 case L2CAP_MODE_ERTM:
3192 rfc.mode = L2CAP_MODE_ERTM;
3193 rfc.max_transmit = chan->max_tx;
3195 __l2cap_set_ertm_timeouts(chan, &rfc);
3197 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
3198 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3200 rfc.max_pdu_size = cpu_to_le16(size);
3202 l2cap_txwin_setup(chan);
3204 rfc.txwin_size = min_t(u16, chan->tx_win,
3205 L2CAP_DEFAULT_TX_WINDOW);
3207 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3208 (unsigned long) &rfc);
3210 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3211 l2cap_add_opt_efs(&ptr, chan);
3213 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3214 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
3217 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3218 if (chan->fcs == L2CAP_FCS_NONE ||
3219 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
3220 chan->fcs = L2CAP_FCS_NONE;
3221 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3226 case L2CAP_MODE_STREAMING:
3227 l2cap_txwin_setup(chan);
3228 rfc.mode = L2CAP_MODE_STREAMING;
3230 rfc.max_transmit = 0;
3231 rfc.retrans_timeout = 0;
3232 rfc.monitor_timeout = 0;
3234 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
3235 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3237 rfc.max_pdu_size = cpu_to_le16(size);
3239 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3240 (unsigned long) &rfc);
3242 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3243 l2cap_add_opt_efs(&ptr, chan);
3245 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3246 if (chan->fcs == L2CAP_FCS_NONE ||
3247 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
3248 chan->fcs = L2CAP_FCS_NONE;
3249 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3255 req->dcid = cpu_to_le16(chan->dcid);
3256 req->flags = __constant_cpu_to_le16(0);
3261 static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
3263 struct l2cap_conf_rsp *rsp = data;
3264 void *ptr = rsp->data;
3265 void *req = chan->conf_req;
3266 int len = chan->conf_len;
3267 int type, hint, olen;
3269 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
3270 struct l2cap_conf_efs efs;
3272 u16 mtu = L2CAP_DEFAULT_MTU;
3273 u16 result = L2CAP_CONF_SUCCESS;
3276 BT_DBG("chan %p", chan);
3278 while (len >= L2CAP_CONF_OPT_SIZE) {
3279 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
3281 hint = type & L2CAP_CONF_HINT;
3282 type &= L2CAP_CONF_MASK;
3285 case L2CAP_CONF_MTU:
3289 case L2CAP_CONF_FLUSH_TO:
3290 chan->flush_to = val;
3293 case L2CAP_CONF_QOS:
3296 case L2CAP_CONF_RFC:
3297 if (olen == sizeof(rfc))
3298 memcpy(&rfc, (void *) val, olen);
3301 case L2CAP_CONF_FCS:
3302 if (val == L2CAP_FCS_NONE)
3303 set_bit(CONF_RECV_NO_FCS, &chan->conf_state);
3306 case L2CAP_CONF_EFS:
3308 if (olen == sizeof(efs))
3309 memcpy(&efs, (void *) val, olen);
3312 case L2CAP_CONF_EWS:
3314 return -ECONNREFUSED;
3316 set_bit(FLAG_EXT_CTRL, &chan->flags);
3317 set_bit(CONF_EWS_RECV, &chan->conf_state);
3318 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3319 chan->remote_tx_win = val;
3326 result = L2CAP_CONF_UNKNOWN;
3327 *((u8 *) ptr++) = type;
3332 if (chan->num_conf_rsp || chan->num_conf_req > 1)
3335 switch (chan->mode) {
3336 case L2CAP_MODE_STREAMING:
3337 case L2CAP_MODE_ERTM:
3338 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
3339 chan->mode = l2cap_select_mode(rfc.mode,
3340 chan->conn->feat_mask);
3345 if (__l2cap_efs_supported(chan))
3346 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3348 return -ECONNREFUSED;
3351 if (chan->mode != rfc.mode)
3352 return -ECONNREFUSED;
3358 if (chan->mode != rfc.mode) {
3359 result = L2CAP_CONF_UNACCEPT;
3360 rfc.mode = chan->mode;
3362 if (chan->num_conf_rsp == 1)
3363 return -ECONNREFUSED;
3365 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3366 (unsigned long) &rfc);
3369 if (result == L2CAP_CONF_SUCCESS) {
3370 /* Configure output options and let the other side know
3371 * which ones we don't like. */
3373 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3374 result = L2CAP_CONF_UNACCEPT;
3377 set_bit(CONF_MTU_DONE, &chan->conf_state);
3379 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
3382 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
3383 efs.stype != L2CAP_SERV_NOTRAFIC &&
3384 efs.stype != chan->local_stype) {
3386 result = L2CAP_CONF_UNACCEPT;
3388 if (chan->num_conf_req >= 1)
3389 return -ECONNREFUSED;
3391 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3393 (unsigned long) &efs);
3395 /* Send PENDING Conf Rsp */
3396 result = L2CAP_CONF_PENDING;
3397 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3402 case L2CAP_MODE_BASIC:
3403 chan->fcs = L2CAP_FCS_NONE;
3404 set_bit(CONF_MODE_DONE, &chan->conf_state);
3407 case L2CAP_MODE_ERTM:
3408 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3409 chan->remote_tx_win = rfc.txwin_size;
3411 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
3413 chan->remote_max_tx = rfc.max_transmit;
3415 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
3416 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3417 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
3418 rfc.max_pdu_size = cpu_to_le16(size);
3419 chan->remote_mps = size;
3421 __l2cap_set_ertm_timeouts(chan, &rfc);
3423 set_bit(CONF_MODE_DONE, &chan->conf_state);
3425 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
3426 sizeof(rfc), (unsigned long) &rfc);
3428 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3429 chan->remote_id = efs.id;
3430 chan->remote_stype = efs.stype;
3431 chan->remote_msdu = le16_to_cpu(efs.msdu);
3432 chan->remote_flush_to =
3433 le32_to_cpu(efs.flush_to);
3434 chan->remote_acc_lat =
3435 le32_to_cpu(efs.acc_lat);
3436 chan->remote_sdu_itime =
3437 le32_to_cpu(efs.sdu_itime);
3438 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3440 (unsigned long) &efs);
3444 case L2CAP_MODE_STREAMING:
3445 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
3446 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3447 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
3448 rfc.max_pdu_size = cpu_to_le16(size);
3449 chan->remote_mps = size;
3451 set_bit(CONF_MODE_DONE, &chan->conf_state);
3453 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3454 (unsigned long) &rfc);
3459 result = L2CAP_CONF_UNACCEPT;
3461 memset(&rfc, 0, sizeof(rfc));
3462 rfc.mode = chan->mode;
3465 if (result == L2CAP_CONF_SUCCESS)
3466 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3468 rsp->scid = cpu_to_le16(chan->dcid);
3469 rsp->result = cpu_to_le16(result);
3470 rsp->flags = __constant_cpu_to_le16(0);
3475 static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
3476 void *data, u16 *result)
3478 struct l2cap_conf_req *req = data;
3479 void *ptr = req->data;
3482 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
3483 struct l2cap_conf_efs efs;
3485 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
3487 while (len >= L2CAP_CONF_OPT_SIZE) {
3488 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3491 case L2CAP_CONF_MTU:
3492 if (val < L2CAP_DEFAULT_MIN_MTU) {
3493 *result = L2CAP_CONF_UNACCEPT;
3494 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
3497 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
3500 case L2CAP_CONF_FLUSH_TO:
3501 chan->flush_to = val;
3502 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
3506 case L2CAP_CONF_RFC:
3507 if (olen == sizeof(rfc))
3508 memcpy(&rfc, (void *)val, olen);
3510 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
3511 rfc.mode != chan->mode)
3512 return -ECONNREFUSED;
3516 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
3517 sizeof(rfc), (unsigned long) &rfc);
3520 case L2CAP_CONF_EWS:
3521 chan->ack_win = min_t(u16, val, chan->ack_win);
3522 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
3526 case L2CAP_CONF_EFS:
3527 if (olen == sizeof(efs))
3528 memcpy(&efs, (void *)val, olen);
3530 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
3531 efs.stype != L2CAP_SERV_NOTRAFIC &&
3532 efs.stype != chan->local_stype)
3533 return -ECONNREFUSED;
3535 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
3536 (unsigned long) &efs);
3539 case L2CAP_CONF_FCS:
3540 if (*result == L2CAP_CONF_PENDING)
3541 if (val == L2CAP_FCS_NONE)
3542 set_bit(CONF_RECV_NO_FCS,
3548 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
3549 return -ECONNREFUSED;
3551 chan->mode = rfc.mode;
3553 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
3555 case L2CAP_MODE_ERTM:
3556 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3557 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3558 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3559 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3560 chan->ack_win = min_t(u16, chan->ack_win,
3563 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3564 chan->local_msdu = le16_to_cpu(efs.msdu);
3565 chan->local_sdu_itime =
3566 le32_to_cpu(efs.sdu_itime);
3567 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3568 chan->local_flush_to =
3569 le32_to_cpu(efs.flush_to);
3573 case L2CAP_MODE_STREAMING:
3574 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3578 req->dcid = cpu_to_le16(chan->dcid);
3579 req->flags = __constant_cpu_to_le16(0);
3584 static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3585 u16 result, u16 flags)
3587 struct l2cap_conf_rsp *rsp = data;
3588 void *ptr = rsp->data;
3590 BT_DBG("chan %p", chan);
3592 rsp->scid = cpu_to_le16(chan->dcid);
3593 rsp->result = cpu_to_le16(result);
3594 rsp->flags = cpu_to_le16(flags);
3599 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
3601 struct l2cap_conn_rsp rsp;
3602 struct l2cap_conn *conn = chan->conn;
3606 rsp.scid = cpu_to_le16(chan->dcid);
3607 rsp.dcid = cpu_to_le16(chan->scid);
3608 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
3609 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
3612 rsp_code = L2CAP_CREATE_CHAN_RSP;
3614 rsp_code = L2CAP_CONN_RSP;
3616 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3618 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
3620 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
3623 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3624 l2cap_build_conf_req(chan, buf), buf);
3625 chan->num_conf_req++;
3628 static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
3632 /* Use sane default values in case a misbehaving remote device
3633 * did not send an RFC or extended window size option.
3635 u16 txwin_ext = chan->ack_win;
3636 struct l2cap_conf_rfc rfc = {
3638 .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3639 .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
3640 .max_pdu_size = cpu_to_le16(chan->imtu),
3641 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3644 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
3646 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
3649 while (len >= L2CAP_CONF_OPT_SIZE) {
3650 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3653 case L2CAP_CONF_RFC:
3654 if (olen == sizeof(rfc))
3655 memcpy(&rfc, (void *)val, olen);
3657 case L2CAP_CONF_EWS:
3664 case L2CAP_MODE_ERTM:
3665 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3666 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3667 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3668 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3669 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3671 chan->ack_win = min_t(u16, chan->ack_win,
3674 case L2CAP_MODE_STREAMING:
3675 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3679 static inline int l2cap_command_rej(struct l2cap_conn *conn,
3680 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3683 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
3685 if (cmd_len < sizeof(*rej))
3688 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
3691 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
3692 cmd->ident == conn->info_ident) {
3693 cancel_delayed_work(&conn->info_timer);
3695 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3696 conn->info_ident = 0;
3698 l2cap_conn_start(conn);
3704 static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3705 struct l2cap_cmd_hdr *cmd,
3706 u8 *data, u8 rsp_code, u8 amp_id)
3708 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3709 struct l2cap_conn_rsp rsp;
3710 struct l2cap_chan *chan = NULL, *pchan;
3711 struct sock *parent, *sk = NULL;
3712 int result, status = L2CAP_CS_NO_INFO;
3714 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
3715 __le16 psm = req->psm;
3717 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
3719 /* Check if we have socket listening on psm */
3720 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst);
3722 result = L2CAP_CR_BAD_PSM;
3728 mutex_lock(&conn->chan_lock);
3731 /* Check if the ACL is secure enough (if not SDP) */
3732 if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) &&
3733 !hci_conn_check_link_mode(conn->hcon)) {
3734 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
3735 result = L2CAP_CR_SEC_BLOCK;
3739 result = L2CAP_CR_NO_MEM;
3741 /* Check if we already have channel with that dcid */
3742 if (__l2cap_get_chan_by_dcid(conn, scid))
3745 chan = pchan->ops->new_connection(pchan);
3751 hci_conn_hold(conn->hcon);
3753 bacpy(&bt_sk(sk)->src, conn->src);
3754 bacpy(&bt_sk(sk)->dst, conn->dst);
3757 chan->local_amp_id = amp_id;
3759 __l2cap_chan_add(conn, chan);
3763 __set_chan_timer(chan, sk->sk_sndtimeo);
3765 chan->ident = cmd->ident;
3767 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
3768 if (l2cap_chan_check_security(chan)) {
3769 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
3770 __l2cap_state_change(chan, BT_CONNECT2);
3771 result = L2CAP_CR_PEND;
3772 status = L2CAP_CS_AUTHOR_PEND;
3773 chan->ops->defer(chan);
3775 /* Force pending result for AMP controllers.
3776 * The connection will succeed after the
3777 * physical link is up.
3780 __l2cap_state_change(chan, BT_CONNECT2);
3781 result = L2CAP_CR_PEND;
3783 __l2cap_state_change(chan, BT_CONFIG);
3784 result = L2CAP_CR_SUCCESS;
3786 status = L2CAP_CS_NO_INFO;
3789 __l2cap_state_change(chan, BT_CONNECT2);
3790 result = L2CAP_CR_PEND;
3791 status = L2CAP_CS_AUTHEN_PEND;
3794 __l2cap_state_change(chan, BT_CONNECT2);
3795 result = L2CAP_CR_PEND;
3796 status = L2CAP_CS_NO_INFO;
3800 release_sock(parent);
3801 mutex_unlock(&conn->chan_lock);
3804 rsp.scid = cpu_to_le16(scid);
3805 rsp.dcid = cpu_to_le16(dcid);
3806 rsp.result = cpu_to_le16(result);
3807 rsp.status = cpu_to_le16(status);
3808 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
3810 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3811 struct l2cap_info_req info;
3812 info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
3814 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3815 conn->info_ident = l2cap_get_ident(conn);
3817 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
3819 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
3820 sizeof(info), &info);
3823 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
3824 result == L2CAP_CR_SUCCESS) {
3826 set_bit(CONF_REQ_SENT, &chan->conf_state);
3827 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3828 l2cap_build_conf_req(chan, buf), buf);
3829 chan->num_conf_req++;
3835 static int l2cap_connect_req(struct l2cap_conn *conn,
3836 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
3838 struct hci_dev *hdev = conn->hcon->hdev;
3839 struct hci_conn *hcon = conn->hcon;
3841 if (cmd_len < sizeof(struct l2cap_conn_req))
3845 if (test_bit(HCI_MGMT, &hdev->dev_flags) &&
3846 !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags))
3847 mgmt_device_connected(hdev, &hcon->dst, hcon->type,
3848 hcon->dst_type, 0, NULL, 0,
3850 hci_dev_unlock(hdev);
3852 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
3856 static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
3857 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3860 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3861 u16 scid, dcid, result, status;
3862 struct l2cap_chan *chan;
3866 if (cmd_len < sizeof(*rsp))
3869 scid = __le16_to_cpu(rsp->scid);
3870 dcid = __le16_to_cpu(rsp->dcid);
3871 result = __le16_to_cpu(rsp->result);
3872 status = __le16_to_cpu(rsp->status);
3874 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
3875 dcid, scid, result, status);
3877 mutex_lock(&conn->chan_lock);
3880 chan = __l2cap_get_chan_by_scid(conn, scid);
3886 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3895 l2cap_chan_lock(chan);
3898 case L2CAP_CR_SUCCESS:
3899 l2cap_state_change(chan, BT_CONFIG);
3902 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
3904 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
3907 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3908 l2cap_build_conf_req(chan, req), req);
3909 chan->num_conf_req++;
3913 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
3917 l2cap_chan_del(chan, ECONNREFUSED);
3921 l2cap_chan_unlock(chan);
3924 mutex_unlock(&conn->chan_lock);
3929 static inline void set_default_fcs(struct l2cap_chan *chan)
3931 /* FCS is enabled only in ERTM or streaming mode, if one or both
3934 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
3935 chan->fcs = L2CAP_FCS_NONE;
3936 else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state))
3937 chan->fcs = L2CAP_FCS_CRC16;
3940 static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
3941 u8 ident, u16 flags)
3943 struct l2cap_conn *conn = chan->conn;
3945 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
3948 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3949 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3951 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
3952 l2cap_build_conf_rsp(chan, data,
3953 L2CAP_CONF_SUCCESS, flags), data);
3956 static inline int l2cap_config_req(struct l2cap_conn *conn,
3957 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3960 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
3963 struct l2cap_chan *chan;
3966 if (cmd_len < sizeof(*req))
3969 dcid = __le16_to_cpu(req->dcid);
3970 flags = __le16_to_cpu(req->flags);
3972 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
3974 chan = l2cap_get_chan_by_scid(conn, dcid);
3978 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
3979 struct l2cap_cmd_rej_cid rej;
3981 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID);
3982 rej.scid = cpu_to_le16(chan->scid);
3983 rej.dcid = cpu_to_le16(chan->dcid);
3985 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
3990 /* Reject if config buffer is too small. */
3991 len = cmd_len - sizeof(*req);
3992 if (chan->conf_len + len > sizeof(chan->conf_req)) {
3993 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
3994 l2cap_build_conf_rsp(chan, rsp,
3995 L2CAP_CONF_REJECT, flags), rsp);
4000 memcpy(chan->conf_req + chan->conf_len, req->data, len);
4001 chan->conf_len += len;
4003 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
4004 /* Incomplete config. Send empty response. */
4005 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
4006 l2cap_build_conf_rsp(chan, rsp,
4007 L2CAP_CONF_SUCCESS, flags), rsp);
4011 /* Complete config. */
4012 len = l2cap_parse_conf_req(chan, rsp);
4014 l2cap_send_disconn_req(chan, ECONNRESET);
4018 chan->ident = cmd->ident;
4019 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
4020 chan->num_conf_rsp++;
4022 /* Reset config buffer. */
4025 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
4028 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
4029 set_default_fcs(chan);
4031 if (chan->mode == L2CAP_MODE_ERTM ||
4032 chan->mode == L2CAP_MODE_STREAMING)
4033 err = l2cap_ertm_init(chan);
4036 l2cap_send_disconn_req(chan, -err);
4038 l2cap_chan_ready(chan);
4043 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
4045 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
4046 l2cap_build_conf_req(chan, buf), buf);
4047 chan->num_conf_req++;
4050 /* Got Conf Rsp PENDING from remote side and asume we sent
4051 Conf Rsp PENDING in the code above */
4052 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
4053 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4055 /* check compatibility */
4057 /* Send rsp for BR/EDR channel */
4059 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
4061 chan->ident = cmd->ident;
4065 l2cap_chan_unlock(chan);
4069 static inline int l2cap_config_rsp(struct l2cap_conn *conn,
4070 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4073 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
4074 u16 scid, flags, result;
4075 struct l2cap_chan *chan;
4076 int len = cmd_len - sizeof(*rsp);
4079 if (cmd_len < sizeof(*rsp))
4082 scid = __le16_to_cpu(rsp->scid);
4083 flags = __le16_to_cpu(rsp->flags);
4084 result = __le16_to_cpu(rsp->result);
4086 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
4089 chan = l2cap_get_chan_by_scid(conn, scid);
4094 case L2CAP_CONF_SUCCESS:
4095 l2cap_conf_rfc_get(chan, rsp->data, len);
4096 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4099 case L2CAP_CONF_PENDING:
4100 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4102 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4105 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
4108 l2cap_send_disconn_req(chan, ECONNRESET);
4112 if (!chan->hs_hcon) {
4113 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
4116 if (l2cap_check_efs(chan)) {
4117 amp_create_logical_link(chan);
4118 chan->ident = cmd->ident;
4124 case L2CAP_CONF_UNACCEPT:
4125 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
4128 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
4129 l2cap_send_disconn_req(chan, ECONNRESET);
4133 /* throw out any old stored conf requests */
4134 result = L2CAP_CONF_SUCCESS;
4135 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
4138 l2cap_send_disconn_req(chan, ECONNRESET);
4142 l2cap_send_cmd(conn, l2cap_get_ident(conn),
4143 L2CAP_CONF_REQ, len, req);
4144 chan->num_conf_req++;
4145 if (result != L2CAP_CONF_SUCCESS)
4151 l2cap_chan_set_err(chan, ECONNRESET);
4153 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
4154 l2cap_send_disconn_req(chan, ECONNRESET);
4158 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
4161 set_bit(CONF_INPUT_DONE, &chan->conf_state);
4163 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
4164 set_default_fcs(chan);
4166 if (chan->mode == L2CAP_MODE_ERTM ||
4167 chan->mode == L2CAP_MODE_STREAMING)
4168 err = l2cap_ertm_init(chan);
4171 l2cap_send_disconn_req(chan, -err);
4173 l2cap_chan_ready(chan);
4177 l2cap_chan_unlock(chan);
4181 static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
4182 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4185 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4186 struct l2cap_disconn_rsp rsp;
4188 struct l2cap_chan *chan;
4191 if (cmd_len != sizeof(*req))
4194 scid = __le16_to_cpu(req->scid);
4195 dcid = __le16_to_cpu(req->dcid);
4197 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4199 mutex_lock(&conn->chan_lock);
4201 chan = __l2cap_get_chan_by_scid(conn, dcid);
4203 mutex_unlock(&conn->chan_lock);
4207 l2cap_chan_lock(chan);
4211 rsp.dcid = cpu_to_le16(chan->scid);
4212 rsp.scid = cpu_to_le16(chan->dcid);
4213 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4216 sk->sk_shutdown = SHUTDOWN_MASK;
4219 l2cap_chan_hold(chan);
4220 l2cap_chan_del(chan, ECONNRESET);
4222 l2cap_chan_unlock(chan);
4224 chan->ops->close(chan);
4225 l2cap_chan_put(chan);
4227 mutex_unlock(&conn->chan_lock);
4232 static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
4233 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4236 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4238 struct l2cap_chan *chan;
4240 if (cmd_len != sizeof(*rsp))
4243 scid = __le16_to_cpu(rsp->scid);
4244 dcid = __le16_to_cpu(rsp->dcid);
4246 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4248 mutex_lock(&conn->chan_lock);
4250 chan = __l2cap_get_chan_by_scid(conn, scid);
4252 mutex_unlock(&conn->chan_lock);
4256 l2cap_chan_lock(chan);
4258 l2cap_chan_hold(chan);
4259 l2cap_chan_del(chan, 0);
4261 l2cap_chan_unlock(chan);
4263 chan->ops->close(chan);
4264 l2cap_chan_put(chan);
4266 mutex_unlock(&conn->chan_lock);
4271 static inline int l2cap_information_req(struct l2cap_conn *conn,
4272 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4275 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
4278 if (cmd_len != sizeof(*req))
4281 type = __le16_to_cpu(req->type);
4283 BT_DBG("type 0x%4.4x", type);
4285 if (type == L2CAP_IT_FEAT_MASK) {
4287 u32 feat_mask = l2cap_feat_mask;
4288 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
4289 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
4290 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
4292 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
4295 feat_mask |= L2CAP_FEAT_EXT_FLOW
4296 | L2CAP_FEAT_EXT_WINDOW;
4298 put_unaligned_le32(feat_mask, rsp->data);
4299 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4301 } else if (type == L2CAP_IT_FIXED_CHAN) {
4303 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
4306 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
4308 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
4310 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4311 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
4312 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
4313 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4316 struct l2cap_info_rsp rsp;
4317 rsp.type = cpu_to_le16(type);
4318 rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP);
4319 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4326 static inline int l2cap_information_rsp(struct l2cap_conn *conn,
4327 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4330 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4333 if (cmd_len != sizeof(*rsp))
4336 type = __le16_to_cpu(rsp->type);
4337 result = __le16_to_cpu(rsp->result);
4339 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4341 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4342 if (cmd->ident != conn->info_ident ||
4343 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
4346 cancel_delayed_work(&conn->info_timer);
4348 if (result != L2CAP_IR_SUCCESS) {
4349 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4350 conn->info_ident = 0;
4352 l2cap_conn_start(conn);
4358 case L2CAP_IT_FEAT_MASK:
4359 conn->feat_mask = get_unaligned_le32(rsp->data);
4361 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
4362 struct l2cap_info_req req;
4363 req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4365 conn->info_ident = l2cap_get_ident(conn);
4367 l2cap_send_cmd(conn, conn->info_ident,
4368 L2CAP_INFO_REQ, sizeof(req), &req);
4370 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4371 conn->info_ident = 0;
4373 l2cap_conn_start(conn);
4377 case L2CAP_IT_FIXED_CHAN:
4378 conn->fixed_chan_mask = rsp->data[0];
4379 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4380 conn->info_ident = 0;
4382 l2cap_conn_start(conn);
4389 static int l2cap_create_channel_req(struct l2cap_conn *conn,
4390 struct l2cap_cmd_hdr *cmd,
4391 u16 cmd_len, void *data)
4393 struct l2cap_create_chan_req *req = data;
4394 struct l2cap_create_chan_rsp rsp;
4395 struct l2cap_chan *chan;
4396 struct hci_dev *hdev;
4399 if (cmd_len != sizeof(*req))
4405 psm = le16_to_cpu(req->psm);
4406 scid = le16_to_cpu(req->scid);
4408 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
4410 /* For controller id 0 make BR/EDR connection */
4411 if (req->amp_id == HCI_BREDR_ID) {
4412 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4417 /* Validate AMP controller id */
4418 hdev = hci_dev_get(req->amp_id);
4422 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4427 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4430 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4431 struct hci_conn *hs_hcon;
4433 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, conn->dst);
4439 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4441 mgr->bredr_chan = chan;
4442 chan->hs_hcon = hs_hcon;
4443 chan->fcs = L2CAP_FCS_NONE;
4444 conn->mtu = hdev->block_mtu;
4453 rsp.scid = cpu_to_le16(scid);
4454 rsp.result = __constant_cpu_to_le16(L2CAP_CR_BAD_AMP);
4455 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4457 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4463 static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4465 struct l2cap_move_chan_req req;
4468 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4470 ident = l2cap_get_ident(chan->conn);
4471 chan->ident = ident;
4473 req.icid = cpu_to_le16(chan->scid);
4474 req.dest_amp_id = dest_amp_id;
4476 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4479 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4482 static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
4484 struct l2cap_move_chan_rsp rsp;
4486 BT_DBG("chan %p, result 0x%4.4x", chan, result);
4488 rsp.icid = cpu_to_le16(chan->dcid);
4489 rsp.result = cpu_to_le16(result);
4491 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4495 static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
4497 struct l2cap_move_chan_cfm cfm;
4499 BT_DBG("chan %p, result 0x%4.4x", chan, result);
4501 chan->ident = l2cap_get_ident(chan->conn);
4503 cfm.icid = cpu_to_le16(chan->scid);
4504 cfm.result = cpu_to_le16(result);
4506 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4509 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4512 static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4514 struct l2cap_move_chan_cfm cfm;
4516 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4518 cfm.icid = cpu_to_le16(icid);
4519 cfm.result = __constant_cpu_to_le16(L2CAP_MC_UNCONFIRMED);
4521 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4525 static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
4528 struct l2cap_move_chan_cfm_rsp rsp;
4530 BT_DBG("icid 0x%4.4x", icid);
4532 rsp.icid = cpu_to_le16(icid);
4533 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4536 static void __release_logical_link(struct l2cap_chan *chan)
4538 chan->hs_hchan = NULL;
4539 chan->hs_hcon = NULL;
4541 /* Placeholder - release the logical link */
4544 static void l2cap_logical_fail(struct l2cap_chan *chan)
4546 /* Logical link setup failed */
4547 if (chan->state != BT_CONNECTED) {
4548 /* Create channel failure, disconnect */
4549 l2cap_send_disconn_req(chan, ECONNRESET);
4553 switch (chan->move_role) {
4554 case L2CAP_MOVE_ROLE_RESPONDER:
4555 l2cap_move_done(chan);
4556 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4558 case L2CAP_MOVE_ROLE_INITIATOR:
4559 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4560 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4561 /* Remote has only sent pending or
4562 * success responses, clean up
4564 l2cap_move_done(chan);
4567 /* Other amp move states imply that the move
4568 * has already aborted
4570 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4575 static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4576 struct hci_chan *hchan)
4578 struct l2cap_conf_rsp rsp;
4580 chan->hs_hchan = hchan;
4581 chan->hs_hcon->l2cap_data = chan->conn;
4583 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
4585 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
4588 set_default_fcs(chan);
4590 err = l2cap_ertm_init(chan);
4592 l2cap_send_disconn_req(chan, -err);
4594 l2cap_chan_ready(chan);
4598 static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4599 struct hci_chan *hchan)
4601 chan->hs_hcon = hchan->conn;
4602 chan->hs_hcon->l2cap_data = chan->conn;
4604 BT_DBG("move_state %d", chan->move_state);
4606 switch (chan->move_state) {
4607 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4608 /* Move confirm will be sent after a success
4609 * response is received
4611 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4613 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4614 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4615 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4616 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4617 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4618 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4619 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4620 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4621 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4625 /* Move was not in expected state, free the channel */
4626 __release_logical_link(chan);
4628 chan->move_state = L2CAP_MOVE_STABLE;
4632 /* Call with chan locked */
4633 void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4636 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4639 l2cap_logical_fail(chan);
4640 __release_logical_link(chan);
4644 if (chan->state != BT_CONNECTED) {
4645 /* Ignore logical link if channel is on BR/EDR */
4646 if (chan->local_amp_id)
4647 l2cap_logical_finish_create(chan, hchan);
4649 l2cap_logical_finish_move(chan, hchan);
4653 void l2cap_move_start(struct l2cap_chan *chan)
4655 BT_DBG("chan %p", chan);
4657 if (chan->local_amp_id == HCI_BREDR_ID) {
4658 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4660 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4661 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4662 /* Placeholder - start physical link setup */
4664 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4665 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4667 l2cap_move_setup(chan);
4668 l2cap_send_move_chan_req(chan, 0);
4672 static void l2cap_do_create(struct l2cap_chan *chan, int result,
4673 u8 local_amp_id, u8 remote_amp_id)
4675 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4676 local_amp_id, remote_amp_id);
4678 chan->fcs = L2CAP_FCS_NONE;
4680 /* Outgoing channel on AMP */
4681 if (chan->state == BT_CONNECT) {
4682 if (result == L2CAP_CR_SUCCESS) {
4683 chan->local_amp_id = local_amp_id;
4684 l2cap_send_create_chan_req(chan, remote_amp_id);
4686 /* Revert to BR/EDR connect */
4687 l2cap_send_conn_req(chan);
4693 /* Incoming channel on AMP */
4694 if (__l2cap_no_conn_pending(chan)) {
4695 struct l2cap_conn_rsp rsp;
4697 rsp.scid = cpu_to_le16(chan->dcid);
4698 rsp.dcid = cpu_to_le16(chan->scid);
4700 if (result == L2CAP_CR_SUCCESS) {
4701 /* Send successful response */
4702 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
4703 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4705 /* Send negative response */
4706 rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM);
4707 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4710 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4713 if (result == L2CAP_CR_SUCCESS) {
4714 __l2cap_state_change(chan, BT_CONFIG);
4715 set_bit(CONF_REQ_SENT, &chan->conf_state);
4716 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4718 l2cap_build_conf_req(chan, buf), buf);
4719 chan->num_conf_req++;
4724 static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4727 l2cap_move_setup(chan);
4728 chan->move_id = local_amp_id;
4729 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4731 l2cap_send_move_chan_req(chan, remote_amp_id);
4734 static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4736 struct hci_chan *hchan = NULL;
4738 /* Placeholder - get hci_chan for logical link */
4741 if (hchan->state == BT_CONNECTED) {
4742 /* Logical link is ready to go */
4743 chan->hs_hcon = hchan->conn;
4744 chan->hs_hcon->l2cap_data = chan->conn;
4745 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4746 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4748 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4750 /* Wait for logical link to be ready */
4751 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4754 /* Logical link not available */
4755 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4759 static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4761 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4763 if (result == -EINVAL)
4764 rsp_result = L2CAP_MR_BAD_ID;
4766 rsp_result = L2CAP_MR_NOT_ALLOWED;
4768 l2cap_send_move_chan_rsp(chan, rsp_result);
4771 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4772 chan->move_state = L2CAP_MOVE_STABLE;
4774 /* Restart data transmission */
4775 l2cap_ertm_send(chan);
4778 /* Invoke with locked chan */
4779 void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
4781 u8 local_amp_id = chan->local_amp_id;
4782 u8 remote_amp_id = chan->remote_amp_id;
4784 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4785 chan, result, local_amp_id, remote_amp_id);
4787 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4788 l2cap_chan_unlock(chan);
4792 if (chan->state != BT_CONNECTED) {
4793 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4794 } else if (result != L2CAP_MR_SUCCESS) {
4795 l2cap_do_move_cancel(chan, result);
4797 switch (chan->move_role) {
4798 case L2CAP_MOVE_ROLE_INITIATOR:
4799 l2cap_do_move_initiate(chan, local_amp_id,
4802 case L2CAP_MOVE_ROLE_RESPONDER:
4803 l2cap_do_move_respond(chan, result);
4806 l2cap_do_move_cancel(chan, result);
4812 static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
4813 struct l2cap_cmd_hdr *cmd,
4814 u16 cmd_len, void *data)
4816 struct l2cap_move_chan_req *req = data;
4817 struct l2cap_move_chan_rsp rsp;
4818 struct l2cap_chan *chan;
4820 u16 result = L2CAP_MR_NOT_ALLOWED;
4822 if (cmd_len != sizeof(*req))
4825 icid = le16_to_cpu(req->icid);
4827 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
4832 chan = l2cap_get_chan_by_dcid(conn, icid);
4834 rsp.icid = cpu_to_le16(icid);
4835 rsp.result = __constant_cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
4836 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4841 chan->ident = cmd->ident;
4843 if (chan->scid < L2CAP_CID_DYN_START ||
4844 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4845 (chan->mode != L2CAP_MODE_ERTM &&
4846 chan->mode != L2CAP_MODE_STREAMING)) {
4847 result = L2CAP_MR_NOT_ALLOWED;
4848 goto send_move_response;
4851 if (chan->local_amp_id == req->dest_amp_id) {
4852 result = L2CAP_MR_SAME_ID;
4853 goto send_move_response;
4856 if (req->dest_amp_id) {
4857 struct hci_dev *hdev;
4858 hdev = hci_dev_get(req->dest_amp_id);
4859 if (!hdev || hdev->dev_type != HCI_AMP ||
4860 !test_bit(HCI_UP, &hdev->flags)) {
4864 result = L2CAP_MR_BAD_ID;
4865 goto send_move_response;
4870 /* Detect a move collision. Only send a collision response
4871 * if this side has "lost", otherwise proceed with the move.
4872 * The winner has the larger bd_addr.
4874 if ((__chan_is_moving(chan) ||
4875 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
4876 bacmp(conn->src, conn->dst) > 0) {
4877 result = L2CAP_MR_COLLISION;
4878 goto send_move_response;
4881 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4882 l2cap_move_setup(chan);
4883 chan->move_id = req->dest_amp_id;
4886 if (!req->dest_amp_id) {
4887 /* Moving to BR/EDR */
4888 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4889 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4890 result = L2CAP_MR_PEND;
4892 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4893 result = L2CAP_MR_SUCCESS;
4896 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4897 /* Placeholder - uncomment when amp functions are available */
4898 /*amp_accept_physical(chan, req->dest_amp_id);*/
4899 result = L2CAP_MR_PEND;
4903 l2cap_send_move_chan_rsp(chan, result);
4905 l2cap_chan_unlock(chan);
4910 static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4912 struct l2cap_chan *chan;
4913 struct hci_chan *hchan = NULL;
4915 chan = l2cap_get_chan_by_scid(conn, icid);
4917 l2cap_send_move_chan_cfm_icid(conn, icid);
4921 __clear_chan_timer(chan);
4922 if (result == L2CAP_MR_PEND)
4923 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
4925 switch (chan->move_state) {
4926 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4927 /* Move confirm will be sent when logical link
4930 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4932 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
4933 if (result == L2CAP_MR_PEND) {
4935 } else if (test_bit(CONN_LOCAL_BUSY,
4936 &chan->conn_state)) {
4937 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4939 /* Logical link is up or moving to BR/EDR,
4942 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4943 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4946 case L2CAP_MOVE_WAIT_RSP:
4948 if (result == L2CAP_MR_SUCCESS) {
4949 /* Remote is ready, send confirm immediately
4950 * after logical link is ready
4952 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4954 /* Both logical link and move success
4955 * are required to confirm
4957 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
4960 /* Placeholder - get hci_chan for logical link */
4962 /* Logical link not available */
4963 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4967 /* If the logical link is not yet connected, do not
4968 * send confirmation.
4970 if (hchan->state != BT_CONNECTED)
4973 /* Logical link is already ready to go */
4975 chan->hs_hcon = hchan->conn;
4976 chan->hs_hcon->l2cap_data = chan->conn;
4978 if (result == L2CAP_MR_SUCCESS) {
4979 /* Can confirm now */
4980 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4982 /* Now only need move success
4985 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4988 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4991 /* Any other amp move state means the move failed. */
4992 chan->move_id = chan->local_amp_id;
4993 l2cap_move_done(chan);
4994 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4997 l2cap_chan_unlock(chan);
5000 static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
5003 struct l2cap_chan *chan;
5005 chan = l2cap_get_chan_by_ident(conn, ident);
5007 /* Could not locate channel, icid is best guess */
5008 l2cap_send_move_chan_cfm_icid(conn, icid);
5012 __clear_chan_timer(chan);
5014 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
5015 if (result == L2CAP_MR_COLLISION) {
5016 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
5018 /* Cleanup - cancel move */
5019 chan->move_id = chan->local_amp_id;
5020 l2cap_move_done(chan);
5024 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5026 l2cap_chan_unlock(chan);
5029 static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
5030 struct l2cap_cmd_hdr *cmd,
5031 u16 cmd_len, void *data)
5033 struct l2cap_move_chan_rsp *rsp = data;
5036 if (cmd_len != sizeof(*rsp))
5039 icid = le16_to_cpu(rsp->icid);
5040 result = le16_to_cpu(rsp->result);
5042 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
5044 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
5045 l2cap_move_continue(conn, icid, result);
5047 l2cap_move_fail(conn, cmd->ident, icid, result);
5052 static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
5053 struct l2cap_cmd_hdr *cmd,
5054 u16 cmd_len, void *data)
5056 struct l2cap_move_chan_cfm *cfm = data;
5057 struct l2cap_chan *chan;
5060 if (cmd_len != sizeof(*cfm))
5063 icid = le16_to_cpu(cfm->icid);
5064 result = le16_to_cpu(cfm->result);
5066 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
5068 chan = l2cap_get_chan_by_dcid(conn, icid);
5070 /* Spec requires a response even if the icid was not found */
5071 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5075 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
5076 if (result == L2CAP_MC_CONFIRMED) {
5077 chan->local_amp_id = chan->move_id;
5078 if (!chan->local_amp_id)
5079 __release_logical_link(chan);
5081 chan->move_id = chan->local_amp_id;
5084 l2cap_move_done(chan);
5087 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5089 l2cap_chan_unlock(chan);
5094 static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
5095 struct l2cap_cmd_hdr *cmd,
5096 u16 cmd_len, void *data)
5098 struct l2cap_move_chan_cfm_rsp *rsp = data;
5099 struct l2cap_chan *chan;
5102 if (cmd_len != sizeof(*rsp))
5105 icid = le16_to_cpu(rsp->icid);
5107 BT_DBG("icid 0x%4.4x", icid);
5109 chan = l2cap_get_chan_by_scid(conn, icid);
5113 __clear_chan_timer(chan);
5115 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
5116 chan->local_amp_id = chan->move_id;
5118 if (!chan->local_amp_id && chan->hs_hchan)
5119 __release_logical_link(chan);
5121 l2cap_move_done(chan);
5124 l2cap_chan_unlock(chan);
5129 static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
5134 if (min > max || min < 6 || max > 3200)
5137 if (to_multiplier < 10 || to_multiplier > 3200)
5140 if (max >= to_multiplier * 8)
5143 max_latency = (to_multiplier * 8 / max) - 1;
5144 if (latency > 499 || latency > max_latency)
5150 static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
5151 struct l2cap_cmd_hdr *cmd,
5154 struct hci_conn *hcon = conn->hcon;
5155 struct l2cap_conn_param_update_req *req;
5156 struct l2cap_conn_param_update_rsp rsp;
5157 u16 min, max, latency, to_multiplier, cmd_len;
5160 if (!(hcon->link_mode & HCI_LM_MASTER))
5163 cmd_len = __le16_to_cpu(cmd->len);
5164 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5167 req = (struct l2cap_conn_param_update_req *) data;
5168 min = __le16_to_cpu(req->min);
5169 max = __le16_to_cpu(req->max);
5170 latency = __le16_to_cpu(req->latency);
5171 to_multiplier = __le16_to_cpu(req->to_multiplier);
5173 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
5174 min, max, latency, to_multiplier);
5176 memset(&rsp, 0, sizeof(rsp));
5178 err = l2cap_check_conn_param(min, max, latency, to_multiplier);
5180 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
5182 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
5184 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
5188 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
5193 static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
5194 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5199 switch (cmd->code) {
5200 case L2CAP_COMMAND_REJ:
5201 l2cap_command_rej(conn, cmd, cmd_len, data);
5204 case L2CAP_CONN_REQ:
5205 err = l2cap_connect_req(conn, cmd, cmd_len, data);
5208 case L2CAP_CONN_RSP:
5209 case L2CAP_CREATE_CHAN_RSP:
5210 err = l2cap_connect_create_rsp(conn, cmd, cmd_len, data);
5213 case L2CAP_CONF_REQ:
5214 err = l2cap_config_req(conn, cmd, cmd_len, data);
5217 case L2CAP_CONF_RSP:
5218 err = l2cap_config_rsp(conn, cmd, cmd_len, data);
5221 case L2CAP_DISCONN_REQ:
5222 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
5225 case L2CAP_DISCONN_RSP:
5226 err = l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
5229 case L2CAP_ECHO_REQ:
5230 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5233 case L2CAP_ECHO_RSP:
5236 case L2CAP_INFO_REQ:
5237 err = l2cap_information_req(conn, cmd, cmd_len, data);
5240 case L2CAP_INFO_RSP:
5241 err = l2cap_information_rsp(conn, cmd, cmd_len, data);
5244 case L2CAP_CREATE_CHAN_REQ:
5245 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5248 case L2CAP_MOVE_CHAN_REQ:
5249 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5252 case L2CAP_MOVE_CHAN_RSP:
5253 err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
5256 case L2CAP_MOVE_CHAN_CFM:
5257 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5260 case L2CAP_MOVE_CHAN_CFM_RSP:
5261 err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
5265 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5273 static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
5274 struct l2cap_cmd_hdr *cmd, u8 *data)
5276 switch (cmd->code) {
5277 case L2CAP_COMMAND_REJ:
5280 case L2CAP_CONN_PARAM_UPDATE_REQ:
5281 return l2cap_conn_param_update_req(conn, cmd, data);
5283 case L2CAP_CONN_PARAM_UPDATE_RSP:
5287 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
5292 static inline void l2cap_sig_channel(struct l2cap_conn *conn,
5293 struct sk_buff *skb)
5295 u8 *data = skb->data;
5297 struct l2cap_cmd_hdr cmd;
5300 l2cap_raw_recv(conn, skb);
5302 while (len >= L2CAP_CMD_HDR_SIZE) {
5304 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5305 data += L2CAP_CMD_HDR_SIZE;
5306 len -= L2CAP_CMD_HDR_SIZE;
5308 cmd_len = le16_to_cpu(cmd.len);
5310 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5313 if (cmd_len > len || !cmd.ident) {
5314 BT_DBG("corrupted command");
5318 if (conn->hcon->type == LE_LINK)
5319 err = l2cap_le_sig_cmd(conn, &cmd, data);
5321 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
5324 struct l2cap_cmd_rej_unk rej;
5326 BT_ERR("Wrong link type (%d)", err);
5328 /* FIXME: Map err to a valid reason */
5329 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
5330 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5341 static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
5343 u16 our_fcs, rcv_fcs;
5346 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5347 hdr_size = L2CAP_EXT_HDR_SIZE;
5349 hdr_size = L2CAP_ENH_HDR_SIZE;
5351 if (chan->fcs == L2CAP_FCS_CRC16) {
5352 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
5353 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5354 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5356 if (our_fcs != rcv_fcs)
5362 static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
5364 struct l2cap_ctrl control;
5366 BT_DBG("chan %p", chan);
5368 memset(&control, 0, sizeof(control));
5371 control.reqseq = chan->buffer_seq;
5372 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5374 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5375 control.super = L2CAP_SUPER_RNR;
5376 l2cap_send_sframe(chan, &control);
5379 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5380 chan->unacked_frames > 0)
5381 __set_retrans_timer(chan);
5383 /* Send pending iframes */
5384 l2cap_ertm_send(chan);
5386 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
5387 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5388 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5391 control.super = L2CAP_SUPER_RR;
5392 l2cap_send_sframe(chan, &control);
5396 static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5397 struct sk_buff **last_frag)
5399 /* skb->len reflects data in skb as well as all fragments
5400 * skb->data_len reflects only data in fragments
5402 if (!skb_has_frag_list(skb))
5403 skb_shinfo(skb)->frag_list = new_frag;
5405 new_frag->next = NULL;
5407 (*last_frag)->next = new_frag;
5408 *last_frag = new_frag;
5410 skb->len += new_frag->len;
5411 skb->data_len += new_frag->len;
5412 skb->truesize += new_frag->truesize;
5415 static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5416 struct l2cap_ctrl *control)
5420 switch (control->sar) {
5421 case L2CAP_SAR_UNSEGMENTED:
5425 err = chan->ops->recv(chan, skb);
5428 case L2CAP_SAR_START:
5432 chan->sdu_len = get_unaligned_le16(skb->data);
5433 skb_pull(skb, L2CAP_SDULEN_SIZE);
5435 if (chan->sdu_len > chan->imtu) {
5440 if (skb->len >= chan->sdu_len)
5444 chan->sdu_last_frag = skb;
5450 case L2CAP_SAR_CONTINUE:
5454 append_skb_frag(chan->sdu, skb,
5455 &chan->sdu_last_frag);
5458 if (chan->sdu->len >= chan->sdu_len)
5468 append_skb_frag(chan->sdu, skb,
5469 &chan->sdu_last_frag);
5472 if (chan->sdu->len != chan->sdu_len)
5475 err = chan->ops->recv(chan, chan->sdu);
5478 /* Reassembly complete */
5480 chan->sdu_last_frag = NULL;
5488 kfree_skb(chan->sdu);
5490 chan->sdu_last_frag = NULL;
5497 static int l2cap_resegment(struct l2cap_chan *chan)
5503 void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
5507 if (chan->mode != L2CAP_MODE_ERTM)
5510 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
5511 l2cap_tx(chan, NULL, NULL, event);
5514 static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5517 /* Pass sequential frames to l2cap_reassemble_sdu()
5518 * until a gap is encountered.
5521 BT_DBG("chan %p", chan);
5523 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5524 struct sk_buff *skb;
5525 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5526 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5528 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5533 skb_unlink(skb, &chan->srej_q);
5534 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5535 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control);
5540 if (skb_queue_empty(&chan->srej_q)) {
5541 chan->rx_state = L2CAP_RX_STATE_RECV;
5542 l2cap_send_ack(chan);
5548 static void l2cap_handle_srej(struct l2cap_chan *chan,
5549 struct l2cap_ctrl *control)
5551 struct sk_buff *skb;
5553 BT_DBG("chan %p, control %p", chan, control);
5555 if (control->reqseq == chan->next_tx_seq) {
5556 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5557 l2cap_send_disconn_req(chan, ECONNRESET);
5561 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5564 BT_DBG("Seq %d not available for retransmission",
5569 if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) {
5570 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5571 l2cap_send_disconn_req(chan, ECONNRESET);
5575 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5577 if (control->poll) {
5578 l2cap_pass_to_tx(chan, control);
5580 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5581 l2cap_retransmit(chan, control);
5582 l2cap_ertm_send(chan);
5584 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5585 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5586 chan->srej_save_reqseq = control->reqseq;
5589 l2cap_pass_to_tx_fbit(chan, control);
5591 if (control->final) {
5592 if (chan->srej_save_reqseq != control->reqseq ||
5593 !test_and_clear_bit(CONN_SREJ_ACT,
5595 l2cap_retransmit(chan, control);
5597 l2cap_retransmit(chan, control);
5598 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5599 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5600 chan->srej_save_reqseq = control->reqseq;
5606 static void l2cap_handle_rej(struct l2cap_chan *chan,
5607 struct l2cap_ctrl *control)
5609 struct sk_buff *skb;
5611 BT_DBG("chan %p, control %p", chan, control);
5613 if (control->reqseq == chan->next_tx_seq) {
5614 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5615 l2cap_send_disconn_req(chan, ECONNRESET);
5619 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5621 if (chan->max_tx && skb &&
5622 bt_cb(skb)->control.retries >= chan->max_tx) {
5623 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5624 l2cap_send_disconn_req(chan, ECONNRESET);
5628 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5630 l2cap_pass_to_tx(chan, control);
5632 if (control->final) {
5633 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
5634 l2cap_retransmit_all(chan, control);
5636 l2cap_retransmit_all(chan, control);
5637 l2cap_ertm_send(chan);
5638 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
5639 set_bit(CONN_REJ_ACT, &chan->conn_state);
5643 static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
5645 BT_DBG("chan %p, txseq %d", chan, txseq);
5647 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
5648 chan->expected_tx_seq);
5650 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
5651 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
5653 /* See notes below regarding "double poll" and
5656 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5657 BT_DBG("Invalid/Ignore - after SREJ");
5658 return L2CAP_TXSEQ_INVALID_IGNORE;
5660 BT_DBG("Invalid - in window after SREJ sent");
5661 return L2CAP_TXSEQ_INVALID;
5665 if (chan->srej_list.head == txseq) {
5666 BT_DBG("Expected SREJ");
5667 return L2CAP_TXSEQ_EXPECTED_SREJ;
5670 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
5671 BT_DBG("Duplicate SREJ - txseq already stored");
5672 return L2CAP_TXSEQ_DUPLICATE_SREJ;
5675 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
5676 BT_DBG("Unexpected SREJ - not requested");
5677 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
5681 if (chan->expected_tx_seq == txseq) {
5682 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
5684 BT_DBG("Invalid - txseq outside tx window");
5685 return L2CAP_TXSEQ_INVALID;
5688 return L2CAP_TXSEQ_EXPECTED;
5692 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
5693 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
5694 BT_DBG("Duplicate - expected_tx_seq later than txseq");
5695 return L2CAP_TXSEQ_DUPLICATE;
5698 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
5699 /* A source of invalid packets is a "double poll" condition,
5700 * where delays cause us to send multiple poll packets. If
5701 * the remote stack receives and processes both polls,
5702 * sequence numbers can wrap around in such a way that a
5703 * resent frame has a sequence number that looks like new data
5704 * with a sequence gap. This would trigger an erroneous SREJ
5707 * Fortunately, this is impossible with a tx window that's
5708 * less than half of the maximum sequence number, which allows
5709 * invalid frames to be safely ignored.
5711 * With tx window sizes greater than half of the tx window
5712 * maximum, the frame is invalid and cannot be ignored. This
5713 * causes a disconnect.
5716 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5717 BT_DBG("Invalid/Ignore - txseq outside tx window");
5718 return L2CAP_TXSEQ_INVALID_IGNORE;
5720 BT_DBG("Invalid - txseq outside tx window");
5721 return L2CAP_TXSEQ_INVALID;
5724 BT_DBG("Unexpected - txseq indicates missing frames");
5725 return L2CAP_TXSEQ_UNEXPECTED;
5729 static int l2cap_rx_state_recv(struct l2cap_chan *chan,
5730 struct l2cap_ctrl *control,
5731 struct sk_buff *skb, u8 event)
5734 bool skb_in_use = 0;
5736 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5740 case L2CAP_EV_RECV_IFRAME:
5741 switch (l2cap_classify_txseq(chan, control->txseq)) {
5742 case L2CAP_TXSEQ_EXPECTED:
5743 l2cap_pass_to_tx(chan, control);
5745 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5746 BT_DBG("Busy, discarding expected seq %d",
5751 chan->expected_tx_seq = __next_seq(chan,
5754 chan->buffer_seq = chan->expected_tx_seq;
5757 err = l2cap_reassemble_sdu(chan, skb, control);
5761 if (control->final) {
5762 if (!test_and_clear_bit(CONN_REJ_ACT,
5763 &chan->conn_state)) {
5765 l2cap_retransmit_all(chan, control);
5766 l2cap_ertm_send(chan);
5770 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
5771 l2cap_send_ack(chan);
5773 case L2CAP_TXSEQ_UNEXPECTED:
5774 l2cap_pass_to_tx(chan, control);
5776 /* Can't issue SREJ frames in the local busy state.
5777 * Drop this frame, it will be seen as missing
5778 * when local busy is exited.
5780 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5781 BT_DBG("Busy, discarding unexpected seq %d",
5786 /* There was a gap in the sequence, so an SREJ
5787 * must be sent for each missing frame. The
5788 * current frame is stored for later use.
5790 skb_queue_tail(&chan->srej_q, skb);
5792 BT_DBG("Queued %p (queue len %d)", skb,
5793 skb_queue_len(&chan->srej_q));
5795 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
5796 l2cap_seq_list_clear(&chan->srej_list);
5797 l2cap_send_srej(chan, control->txseq);
5799 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
5801 case L2CAP_TXSEQ_DUPLICATE:
5802 l2cap_pass_to_tx(chan, control);
5804 case L2CAP_TXSEQ_INVALID_IGNORE:
5806 case L2CAP_TXSEQ_INVALID:
5808 l2cap_send_disconn_req(chan, ECONNRESET);
5812 case L2CAP_EV_RECV_RR:
5813 l2cap_pass_to_tx(chan, control);
5814 if (control->final) {
5815 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5817 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
5818 !__chan_is_moving(chan)) {
5820 l2cap_retransmit_all(chan, control);
5823 l2cap_ertm_send(chan);
5824 } else if (control->poll) {
5825 l2cap_send_i_or_rr_or_rnr(chan);
5827 if (test_and_clear_bit(CONN_REMOTE_BUSY,
5828 &chan->conn_state) &&
5829 chan->unacked_frames)
5830 __set_retrans_timer(chan);
5832 l2cap_ertm_send(chan);
5835 case L2CAP_EV_RECV_RNR:
5836 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5837 l2cap_pass_to_tx(chan, control);
5838 if (control && control->poll) {
5839 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5840 l2cap_send_rr_or_rnr(chan, 0);
5842 __clear_retrans_timer(chan);
5843 l2cap_seq_list_clear(&chan->retrans_list);
5845 case L2CAP_EV_RECV_REJ:
5846 l2cap_handle_rej(chan, control);
5848 case L2CAP_EV_RECV_SREJ:
5849 l2cap_handle_srej(chan, control);
5855 if (skb && !skb_in_use) {
5856 BT_DBG("Freeing %p", skb);
5863 static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
5864 struct l2cap_ctrl *control,
5865 struct sk_buff *skb, u8 event)
5868 u16 txseq = control->txseq;
5869 bool skb_in_use = 0;
5871 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5875 case L2CAP_EV_RECV_IFRAME:
5876 switch (l2cap_classify_txseq(chan, txseq)) {
5877 case L2CAP_TXSEQ_EXPECTED:
5878 /* Keep frame for reassembly later */
5879 l2cap_pass_to_tx(chan, control);
5880 skb_queue_tail(&chan->srej_q, skb);
5882 BT_DBG("Queued %p (queue len %d)", skb,
5883 skb_queue_len(&chan->srej_q));
5885 chan->expected_tx_seq = __next_seq(chan, txseq);
5887 case L2CAP_TXSEQ_EXPECTED_SREJ:
5888 l2cap_seq_list_pop(&chan->srej_list);
5890 l2cap_pass_to_tx(chan, control);
5891 skb_queue_tail(&chan->srej_q, skb);
5893 BT_DBG("Queued %p (queue len %d)", skb,
5894 skb_queue_len(&chan->srej_q));
5896 err = l2cap_rx_queued_iframes(chan);
5901 case L2CAP_TXSEQ_UNEXPECTED:
5902 /* Got a frame that can't be reassembled yet.
5903 * Save it for later, and send SREJs to cover
5904 * the missing frames.
5906 skb_queue_tail(&chan->srej_q, skb);
5908 BT_DBG("Queued %p (queue len %d)", skb,
5909 skb_queue_len(&chan->srej_q));
5911 l2cap_pass_to_tx(chan, control);
5912 l2cap_send_srej(chan, control->txseq);
5914 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
5915 /* This frame was requested with an SREJ, but
5916 * some expected retransmitted frames are
5917 * missing. Request retransmission of missing
5920 skb_queue_tail(&chan->srej_q, skb);
5922 BT_DBG("Queued %p (queue len %d)", skb,
5923 skb_queue_len(&chan->srej_q));
5925 l2cap_pass_to_tx(chan, control);
5926 l2cap_send_srej_list(chan, control->txseq);
5928 case L2CAP_TXSEQ_DUPLICATE_SREJ:
5929 /* We've already queued this frame. Drop this copy. */
5930 l2cap_pass_to_tx(chan, control);
5932 case L2CAP_TXSEQ_DUPLICATE:
5933 /* Expecting a later sequence number, so this frame
5934 * was already received. Ignore it completely.
5937 case L2CAP_TXSEQ_INVALID_IGNORE:
5939 case L2CAP_TXSEQ_INVALID:
5941 l2cap_send_disconn_req(chan, ECONNRESET);
5945 case L2CAP_EV_RECV_RR:
5946 l2cap_pass_to_tx(chan, control);
5947 if (control->final) {
5948 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5950 if (!test_and_clear_bit(CONN_REJ_ACT,
5951 &chan->conn_state)) {
5953 l2cap_retransmit_all(chan, control);
5956 l2cap_ertm_send(chan);
5957 } else if (control->poll) {
5958 if (test_and_clear_bit(CONN_REMOTE_BUSY,
5959 &chan->conn_state) &&
5960 chan->unacked_frames) {
5961 __set_retrans_timer(chan);
5964 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5965 l2cap_send_srej_tail(chan);
5967 if (test_and_clear_bit(CONN_REMOTE_BUSY,
5968 &chan->conn_state) &&
5969 chan->unacked_frames)
5970 __set_retrans_timer(chan);
5972 l2cap_send_ack(chan);
5975 case L2CAP_EV_RECV_RNR:
5976 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5977 l2cap_pass_to_tx(chan, control);
5978 if (control->poll) {
5979 l2cap_send_srej_tail(chan);
5981 struct l2cap_ctrl rr_control;
5982 memset(&rr_control, 0, sizeof(rr_control));
5983 rr_control.sframe = 1;
5984 rr_control.super = L2CAP_SUPER_RR;
5985 rr_control.reqseq = chan->buffer_seq;
5986 l2cap_send_sframe(chan, &rr_control);
5990 case L2CAP_EV_RECV_REJ:
5991 l2cap_handle_rej(chan, control);
5993 case L2CAP_EV_RECV_SREJ:
5994 l2cap_handle_srej(chan, control);
5998 if (skb && !skb_in_use) {
5999 BT_DBG("Freeing %p", skb);
6006 static int l2cap_finish_move(struct l2cap_chan *chan)
6008 BT_DBG("chan %p", chan);
6010 chan->rx_state = L2CAP_RX_STATE_RECV;
6013 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6015 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6017 return l2cap_resegment(chan);
6020 static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
6021 struct l2cap_ctrl *control,
6022 struct sk_buff *skb, u8 event)
6026 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6032 l2cap_process_reqseq(chan, control->reqseq);
6034 if (!skb_queue_empty(&chan->tx_q))
6035 chan->tx_send_head = skb_peek(&chan->tx_q);
6037 chan->tx_send_head = NULL;
6039 /* Rewind next_tx_seq to the point expected
6042 chan->next_tx_seq = control->reqseq;
6043 chan->unacked_frames = 0;
6045 err = l2cap_finish_move(chan);
6049 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6050 l2cap_send_i_or_rr_or_rnr(chan);
6052 if (event == L2CAP_EV_RECV_IFRAME)
6055 return l2cap_rx_state_recv(chan, control, NULL, event);
6058 static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
6059 struct l2cap_ctrl *control,
6060 struct sk_buff *skb, u8 event)
6064 if (!control->final)
6067 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6069 chan->rx_state = L2CAP_RX_STATE_RECV;
6070 l2cap_process_reqseq(chan, control->reqseq);
6072 if (!skb_queue_empty(&chan->tx_q))
6073 chan->tx_send_head = skb_peek(&chan->tx_q);
6075 chan->tx_send_head = NULL;
6077 /* Rewind next_tx_seq to the point expected
6080 chan->next_tx_seq = control->reqseq;
6081 chan->unacked_frames = 0;
6084 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6086 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6088 err = l2cap_resegment(chan);
6091 err = l2cap_rx_state_recv(chan, control, skb, event);
6096 static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
6098 /* Make sure reqseq is for a packet that has been sent but not acked */
6101 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
6102 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
6105 static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6106 struct sk_buff *skb, u8 event)
6110 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
6111 control, skb, event, chan->rx_state);
6113 if (__valid_reqseq(chan, control->reqseq)) {
6114 switch (chan->rx_state) {
6115 case L2CAP_RX_STATE_RECV:
6116 err = l2cap_rx_state_recv(chan, control, skb, event);
6118 case L2CAP_RX_STATE_SREJ_SENT:
6119 err = l2cap_rx_state_srej_sent(chan, control, skb,
6122 case L2CAP_RX_STATE_WAIT_P:
6123 err = l2cap_rx_state_wait_p(chan, control, skb, event);
6125 case L2CAP_RX_STATE_WAIT_F:
6126 err = l2cap_rx_state_wait_f(chan, control, skb, event);
6133 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
6134 control->reqseq, chan->next_tx_seq,
6135 chan->expected_ack_seq);
6136 l2cap_send_disconn_req(chan, ECONNRESET);
6142 static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6143 struct sk_buff *skb)
6147 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
6150 if (l2cap_classify_txseq(chan, control->txseq) ==
6151 L2CAP_TXSEQ_EXPECTED) {
6152 l2cap_pass_to_tx(chan, control);
6154 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
6155 __next_seq(chan, chan->buffer_seq));
6157 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6159 l2cap_reassemble_sdu(chan, skb, control);
6162 kfree_skb(chan->sdu);
6165 chan->sdu_last_frag = NULL;
6169 BT_DBG("Freeing %p", skb);
6174 chan->last_acked_seq = control->txseq;
6175 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6180 static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6182 struct l2cap_ctrl *control = &bt_cb(skb)->control;
6186 __unpack_control(chan, skb);
6191 * We can just drop the corrupted I-frame here.
6192 * Receiver will miss it and start proper recovery
6193 * procedures and ask for retransmission.
6195 if (l2cap_check_fcs(chan, skb))
6198 if (!control->sframe && control->sar == L2CAP_SAR_START)
6199 len -= L2CAP_SDULEN_SIZE;
6201 if (chan->fcs == L2CAP_FCS_CRC16)
6202 len -= L2CAP_FCS_SIZE;
6204 if (len > chan->mps) {
6205 l2cap_send_disconn_req(chan, ECONNRESET);
6209 if (!control->sframe) {
6212 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6213 control->sar, control->reqseq, control->final,
6216 /* Validate F-bit - F=0 always valid, F=1 only
6217 * valid in TX WAIT_F
6219 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
6222 if (chan->mode != L2CAP_MODE_STREAMING) {
6223 event = L2CAP_EV_RECV_IFRAME;
6224 err = l2cap_rx(chan, control, skb, event);
6226 err = l2cap_stream_rx(chan, control, skb);
6230 l2cap_send_disconn_req(chan, ECONNRESET);
6232 const u8 rx_func_to_event[4] = {
6233 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6234 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6237 /* Only I-frames are expected in streaming mode */
6238 if (chan->mode == L2CAP_MODE_STREAMING)
6241 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6242 control->reqseq, control->final, control->poll,
6246 BT_ERR("Trailing bytes: %d in sframe", len);
6247 l2cap_send_disconn_req(chan, ECONNRESET);
6251 /* Validate F and P bits */
6252 if (control->final && (control->poll ||
6253 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6256 event = rx_func_to_event[control->super];
6257 if (l2cap_rx(chan, control, skb, event))
6258 l2cap_send_disconn_req(chan, ECONNRESET);
6268 static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6269 struct sk_buff *skb)
6271 struct l2cap_chan *chan;
6273 chan = l2cap_get_chan_by_scid(conn, cid);
6275 if (cid == L2CAP_CID_A2MP) {
6276 chan = a2mp_channel_create(conn, skb);
6282 l2cap_chan_lock(chan);
6284 BT_DBG("unknown cid 0x%4.4x", cid);
6285 /* Drop packet and return */
6291 BT_DBG("chan %p, len %d", chan, skb->len);
6293 if (chan->state != BT_CONNECTED)
6296 switch (chan->mode) {
6297 case L2CAP_MODE_BASIC:
6298 /* If socket recv buffers overflows we drop data here
6299 * which is *bad* because L2CAP has to be reliable.
6300 * But we don't have any other choice. L2CAP doesn't
6301 * provide flow control mechanism. */
6303 if (chan->imtu < skb->len)
6306 if (!chan->ops->recv(chan, skb))
6310 case L2CAP_MODE_ERTM:
6311 case L2CAP_MODE_STREAMING:
6312 l2cap_data_rcv(chan, skb);
6316 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
6324 l2cap_chan_unlock(chan);
6327 static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6328 struct sk_buff *skb)
6330 struct l2cap_chan *chan;
6332 chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst);
6336 BT_DBG("chan %p, len %d", chan, skb->len);
6338 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
6341 if (chan->imtu < skb->len)
6344 if (!chan->ops->recv(chan, skb))
6351 static void l2cap_att_channel(struct l2cap_conn *conn,
6352 struct sk_buff *skb)
6354 struct l2cap_chan *chan;
6356 chan = l2cap_global_chan_by_scid(0, L2CAP_CID_LE_DATA,
6357 conn->src, conn->dst);
6361 BT_DBG("chan %p, len %d", chan, skb->len);
6363 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
6366 if (chan->imtu < skb->len)
6369 if (!chan->ops->recv(chan, skb))
6376 static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6378 struct l2cap_hdr *lh = (void *) skb->data;
6382 skb_pull(skb, L2CAP_HDR_SIZE);
6383 cid = __le16_to_cpu(lh->cid);
6384 len = __le16_to_cpu(lh->len);
6386 if (len != skb->len) {
6391 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6394 case L2CAP_CID_LE_SIGNALING:
6395 case L2CAP_CID_SIGNALING:
6396 l2cap_sig_channel(conn, skb);
6399 case L2CAP_CID_CONN_LESS:
6400 psm = get_unaligned((__le16 *) skb->data);
6401 skb_pull(skb, L2CAP_PSMLEN_SIZE);
6402 l2cap_conless_channel(conn, psm, skb);
6405 case L2CAP_CID_LE_DATA:
6406 l2cap_att_channel(conn, skb);
6410 if (smp_sig_channel(conn, skb))
6411 l2cap_conn_del(conn->hcon, EACCES);
6415 l2cap_data_channel(conn, cid, skb);
6420 /* ---- L2CAP interface with lower layer (HCI) ---- */
6422 int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
6424 int exact = 0, lm1 = 0, lm2 = 0;
6425 struct l2cap_chan *c;
6427 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
6429 /* Find listening sockets and check their link_mode */
6430 read_lock(&chan_list_lock);
6431 list_for_each_entry(c, &chan_list, global_l) {
6432 struct sock *sk = c->sk;
6434 if (c->state != BT_LISTEN)
6437 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
6438 lm1 |= HCI_LM_ACCEPT;
6439 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
6440 lm1 |= HCI_LM_MASTER;
6442 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
6443 lm2 |= HCI_LM_ACCEPT;
6444 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
6445 lm2 |= HCI_LM_MASTER;
6448 read_unlock(&chan_list_lock);
6450 return exact ? lm1 : lm2;
6453 void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
6455 struct l2cap_conn *conn;
6457 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
6460 conn = l2cap_conn_add(hcon);
6462 l2cap_conn_ready(conn);
6464 l2cap_conn_del(hcon, bt_to_errno(status));
6468 int l2cap_disconn_ind(struct hci_conn *hcon)
6470 struct l2cap_conn *conn = hcon->l2cap_data;
6472 BT_DBG("hcon %p", hcon);
6475 return HCI_ERROR_REMOTE_USER_TERM;
6476 return conn->disc_reason;
6479 void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
6481 BT_DBG("hcon %p reason %d", hcon, reason);
6483 l2cap_conn_del(hcon, bt_to_errno(reason));
6486 static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
6488 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
6491 if (encrypt == 0x00) {
6492 if (chan->sec_level == BT_SECURITY_MEDIUM) {
6493 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
6494 } else if (chan->sec_level == BT_SECURITY_HIGH)
6495 l2cap_chan_close(chan, ECONNREFUSED);
6497 if (chan->sec_level == BT_SECURITY_MEDIUM)
6498 __clear_chan_timer(chan);
6502 int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
6504 struct l2cap_conn *conn = hcon->l2cap_data;
6505 struct l2cap_chan *chan;
6510 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
6512 if (hcon->type == LE_LINK) {
6513 if (!status && encrypt)
6514 smp_distribute_keys(conn, 0);
6515 cancel_delayed_work(&conn->security_timer);
6518 mutex_lock(&conn->chan_lock);
6520 list_for_each_entry(chan, &conn->chan_l, list) {
6521 l2cap_chan_lock(chan);
6523 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
6524 state_to_string(chan->state));
6526 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
6527 l2cap_chan_unlock(chan);
6531 if (chan->scid == L2CAP_CID_LE_DATA) {
6532 if (!status && encrypt) {
6533 chan->sec_level = hcon->sec_level;
6534 l2cap_chan_ready(chan);
6537 l2cap_chan_unlock(chan);
6541 if (!__l2cap_no_conn_pending(chan)) {
6542 l2cap_chan_unlock(chan);
6546 if (!status && (chan->state == BT_CONNECTED ||
6547 chan->state == BT_CONFIG)) {
6548 struct sock *sk = chan->sk;
6550 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
6551 sk->sk_state_change(sk);
6553 l2cap_check_encryption(chan, encrypt);
6554 l2cap_chan_unlock(chan);
6558 if (chan->state == BT_CONNECT) {
6560 l2cap_start_connection(chan);
6562 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
6564 } else if (chan->state == BT_CONNECT2) {
6565 struct sock *sk = chan->sk;
6566 struct l2cap_conn_rsp rsp;
6572 if (test_bit(BT_SK_DEFER_SETUP,
6573 &bt_sk(sk)->flags)) {
6574 res = L2CAP_CR_PEND;
6575 stat = L2CAP_CS_AUTHOR_PEND;
6576 chan->ops->defer(chan);
6578 __l2cap_state_change(chan, BT_CONFIG);
6579 res = L2CAP_CR_SUCCESS;
6580 stat = L2CAP_CS_NO_INFO;
6583 __l2cap_state_change(chan, BT_DISCONN);
6584 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
6585 res = L2CAP_CR_SEC_BLOCK;
6586 stat = L2CAP_CS_NO_INFO;
6591 rsp.scid = cpu_to_le16(chan->dcid);
6592 rsp.dcid = cpu_to_le16(chan->scid);
6593 rsp.result = cpu_to_le16(res);
6594 rsp.status = cpu_to_le16(stat);
6595 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
6598 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
6599 res == L2CAP_CR_SUCCESS) {
6601 set_bit(CONF_REQ_SENT, &chan->conf_state);
6602 l2cap_send_cmd(conn, l2cap_get_ident(conn),
6604 l2cap_build_conf_req(chan, buf),
6606 chan->num_conf_req++;
6610 l2cap_chan_unlock(chan);
6613 mutex_unlock(&conn->chan_lock);
6618 int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
6620 struct l2cap_conn *conn = hcon->l2cap_data;
6621 struct l2cap_hdr *hdr;
6624 /* For AMP controller do not create l2cap conn */
6625 if (!conn && hcon->hdev->dev_type != HCI_BREDR)
6629 conn = l2cap_conn_add(hcon);
6634 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
6638 case ACL_START_NO_FLUSH:
6641 BT_ERR("Unexpected start frame (len %d)", skb->len);
6642 kfree_skb(conn->rx_skb);
6643 conn->rx_skb = NULL;
6645 l2cap_conn_unreliable(conn, ECOMM);
6648 /* Start fragment always begin with Basic L2CAP header */
6649 if (skb->len < L2CAP_HDR_SIZE) {
6650 BT_ERR("Frame is too short (len %d)", skb->len);
6651 l2cap_conn_unreliable(conn, ECOMM);
6655 hdr = (struct l2cap_hdr *) skb->data;
6656 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
6658 if (len == skb->len) {
6659 /* Complete frame received */
6660 l2cap_recv_frame(conn, skb);
6664 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
6666 if (skb->len > len) {
6667 BT_ERR("Frame is too long (len %d, expected len %d)",
6669 l2cap_conn_unreliable(conn, ECOMM);
6673 /* Allocate skb for the complete frame (with header) */
6674 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
6678 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
6680 conn->rx_len = len - skb->len;
6684 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
6686 if (!conn->rx_len) {
6687 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
6688 l2cap_conn_unreliable(conn, ECOMM);
6692 if (skb->len > conn->rx_len) {
6693 BT_ERR("Fragment is too long (len %d, expected %d)",
6694 skb->len, conn->rx_len);
6695 kfree_skb(conn->rx_skb);
6696 conn->rx_skb = NULL;
6698 l2cap_conn_unreliable(conn, ECOMM);
6702 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
6704 conn->rx_len -= skb->len;
6706 if (!conn->rx_len) {
6707 /* Complete frame received */
6708 l2cap_recv_frame(conn, conn->rx_skb);
6709 conn->rx_skb = NULL;
6719 static int l2cap_debugfs_show(struct seq_file *f, void *p)
6721 struct l2cap_chan *c;
6723 read_lock(&chan_list_lock);
6725 list_for_each_entry(c, &chan_list, global_l) {
6726 struct sock *sk = c->sk;
6728 seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
6729 &bt_sk(sk)->src, &bt_sk(sk)->dst,
6730 c->state, __le16_to_cpu(c->psm),
6731 c->scid, c->dcid, c->imtu, c->omtu,
6732 c->sec_level, c->mode);
6735 read_unlock(&chan_list_lock);
6740 static int l2cap_debugfs_open(struct inode *inode, struct file *file)
6742 return single_open(file, l2cap_debugfs_show, inode->i_private);
6745 static const struct file_operations l2cap_debugfs_fops = {
6746 .open = l2cap_debugfs_open,
6748 .llseek = seq_lseek,
6749 .release = single_release,
6752 static struct dentry *l2cap_debugfs;
6754 int __init l2cap_init(void)
6758 err = l2cap_init_sockets();
6763 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
6764 NULL, &l2cap_debugfs_fops);
6766 BT_ERR("Failed to create L2CAP debug file");
6772 void l2cap_exit(void)
6774 debugfs_remove(l2cap_debugfs);
6775 l2cap_cleanup_sockets();
6778 module_param(disable_ertm, bool, 0644);
6779 MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");