1 /******************************************************************************
3 * Copyright (C) 1999-2012 Broadcom Corporation
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
17 ******************************************************************************/
19 /******************************************************************************
21 * This file contains the main L2CAP entry points
23 ******************************************************************************/
25 #define LOG_TAG "bt_l2c_main"
33 #include "bt_target.h"
36 #include "device/include/controller.h"
37 #include "bt_common.h"
42 #include "osi/include/log.h"
45 extern fixed_queue_t *btu_general_alarm_queue;
47 /********************************************************************************/
48 /* L O C A L F U N C T I O N P R O T O T Y P E S */
49 /********************************************************************************/
50 static void process_l2cap_cmd (tL2C_LCB *p_lcb, UINT8 *p, UINT16 pkt_len);
52 /********************************************************************************/
53 /* G L O B A L L 2 C A P D A T A */
54 /********************************************************************************/
55 #if L2C_DYNAMIC_MEMORY == FALSE
59 /*******************************************************************************
61 ** Function l2c_rcv_acl_data
63 ** Description This function is called from the HCI Interface when an ACL
64 ** data packet is received.
68 *******************************************************************************/
69 void l2c_rcv_acl_data (BT_HDR *p_msg)
71 UINT8 *p = (UINT8 *)(p_msg + 1) + p_msg->offset;
72 UINT16 handle, hci_len;
75 tL2C_CCB *p_ccb = NULL;
76 UINT16 l2cap_len, rcv_cid, psm;
79 /* Extract the handle */
80 STREAM_TO_UINT16 (handle, p);
81 pkt_type = HCID_GET_EVENT (handle);
82 handle = HCID_GET_HANDLE (handle);
84 /* Since the HCI Transport is putting segmented packets back together, we */
85 /* should never get a valid packet with the type set to "continuation" */
86 if (pkt_type != L2CAP_PKT_CONTINUE)
88 /* Find the LCB based on the handle */
89 if ((p_lcb = l2cu_find_lcb_by_handle (handle)) == NULL)
93 /* There is a slight possibility (specifically with USB) that we get an */
94 /* L2CAP connection request before we get the HCI connection complete. */
95 /* So for these types of messages, hold them for up to 2 seconds. */
96 STREAM_TO_UINT16 (hci_len, p);
97 STREAM_TO_UINT16 (l2cap_len, p);
98 STREAM_TO_UINT16 (rcv_cid, p);
99 STREAM_TO_UINT8 (cmd_code, p);
101 if ((p_msg->layer_specific == 0) && (rcv_cid == L2CAP_SIGNALLING_CID)
102 && (cmd_code == L2CAP_CMD_INFO_REQ || cmd_code == L2CAP_CMD_CONN_REQ)) {
103 L2CAP_TRACE_WARNING ("L2CAP - holding ACL for unknown handle:%d ls:%d"
104 " cid:%d opcode:%d cur count:%d", handle, p_msg->layer_specific,
105 rcv_cid, cmd_code, list_length(l2cb.rcv_pending_q));
106 p_msg->layer_specific = 2;
107 list_append(l2cb.rcv_pending_q, p_msg);
109 if (list_length(l2cb.rcv_pending_q) == 1) {
110 alarm_set_on_queue(l2cb.receive_hold_timer,
112 l2c_receive_hold_timer_timeout, NULL,
113 btu_general_alarm_queue);
118 L2CAP_TRACE_ERROR ("L2CAP - rcvd ACL for unknown handle:%d ls:%d cid:%d"
119 " opcode:%d cur count:%d", handle, p_msg->layer_specific, rcv_cid,
120 cmd_code, list_length(l2cb.rcv_pending_q));
128 L2CAP_TRACE_WARNING ("L2CAP - expected pkt start or complete, got: %d", pkt_type);
133 /* Extract the length and update the buffer header */
134 STREAM_TO_UINT16 (hci_len, p);
137 if (hci_len < L2CAP_PKT_OVERHEAD) {
138 /* Must receive at least the L2CAP length and CID */
139 L2CAP_TRACE_WARNING ("L2CAP - got incorrect hci header");
140 android_errorWriteLog(0x534e4554, "34946955");
145 /* Extract the length and CID */
146 STREAM_TO_UINT16 (l2cap_len, p);
147 STREAM_TO_UINT16 (rcv_cid, p);
149 #if BLE_INCLUDED == TRUE
150 /* for BLE channel, always notify connection when ACL data received on the link */
151 if (p_lcb && p_lcb->transport == BT_TRANSPORT_LE && p_lcb->link_state != LST_DISCONNECTING)
152 /* only process fixed channel data as channel open indication when link is not in disconnecting mode */
153 l2cble_notify_le_connection(p_lcb->remote_bd_addr);
156 /* Find the CCB for this CID */
157 if (rcv_cid >= L2CAP_BASE_APPL_CID)
159 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, rcv_cid)) == NULL)
161 L2CAP_TRACE_WARNING ("L2CAP - unknown CID: 0x%04x", rcv_cid);
167 p_msg->len = hci_len - L2CAP_PKT_OVERHEAD;
168 p_msg->offset += L2CAP_PKT_OVERHEAD;
170 if (l2cap_len != p_msg->len)
172 L2CAP_TRACE_WARNING ("L2CAP - bad length in pkt. Exp: %d Act: %d",
173 l2cap_len, p_msg->len);
179 /* Send the data through the channel state machine */
180 if (rcv_cid == L2CAP_SIGNALLING_CID)
182 process_l2cap_cmd (p_lcb, p, l2cap_len);
185 else if (rcv_cid == L2CAP_CONNECTIONLESS_CID)
187 /* process_connectionless_data (p_lcb); */
188 STREAM_TO_UINT16 (psm, p);
189 L2CAP_TRACE_DEBUG( "GOT CONNECTIONLESS DATA PSM:%d", psm ) ;
191 #if (L2CAP_UCD_INCLUDED == TRUE)
192 /* if it is not broadcast, check UCD registration */
193 if ( l2c_ucd_check_rx_pkts( p_lcb, p_msg ) )
201 #if (BLE_INCLUDED == TRUE)
202 else if (rcv_cid == L2CAP_BLE_SIGNALLING_CID)
204 l2cble_process_sig_cmd (p_lcb, p, l2cap_len);
208 #if (L2CAP_NUM_FIXED_CHNLS > 0)
209 else if ((rcv_cid >= L2CAP_FIRST_FIXED_CHNL) && (rcv_cid <= L2CAP_LAST_FIXED_CHNL) &&
210 (l2cb.fixed_reg[rcv_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb != NULL) )
212 /* If no CCB for this channel, allocate one */
214 /* only process fixed channel data when link is open or wait for data indication */
215 (p_lcb->link_state != LST_DISCONNECTING) &&
216 l2cu_initialize_fixed_ccb (p_lcb, rcv_cid, &l2cb.fixed_reg[rcv_cid - L2CAP_FIRST_FIXED_CHNL].fixed_chnl_opts))
218 p_ccb = p_lcb->p_fixed_ccbs[rcv_cid - L2CAP_FIRST_FIXED_CHNL];
220 if (p_ccb->peer_cfg.fcr.mode != L2CAP_FCR_BASIC_MODE)
221 l2c_fcr_proc_pdu (p_ccb, p_msg);
223 (*l2cb.fixed_reg[rcv_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb)
224 (rcv_cid, p_lcb->remote_bd_addr, p_msg);
237 if (p_lcb->transport == BT_TRANSPORT_LE)
239 l2c_lcc_proc_pdu(p_ccb,p_msg);
240 // Got a pkt, valid send out credits to the peer device
241 credit = L2CAP_LE_DEFAULT_CREDIT;
242 l2c_csm_execute(p_ccb, L2CEVT_L2CA_SEND_FLOW_CONTROL_CREDIT, &credit);
246 /* Basic mode packets go straight to the state machine */
247 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_BASIC_MODE)
248 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DATA, p_msg);
251 /* eRTM or streaming mode, so we need to validate states first */
252 if ((p_ccb->chnl_state == CST_OPEN) || (p_ccb->chnl_state == CST_CONFIG))
253 l2c_fcr_proc_pdu (p_ccb, p_msg);
262 /*******************************************************************************
264 ** Function process_l2cap_cmd
266 ** Description This function is called when a packet is received on the
267 ** L2CAP signalling CID
271 *******************************************************************************/
272 static void process_l2cap_cmd (tL2C_LCB *p_lcb, UINT8 *p, UINT16 pkt_len)
274 UINT8 *p_pkt_end, *p_next_cmd, *p_cfg_end, *p_cfg_start;
275 UINT8 cmd_code, cfg_code, cfg_len, id;
276 tL2C_CONN_INFO con_info;
277 tL2CAP_CFG_INFO cfg_info;
278 UINT16 rej_reason, rej_mtu, lcid, rcid, info_type;
281 BOOLEAN cfg_rej, pkt_size_rej = FALSE;
282 UINT16 cfg_rej_len, cmd_len;
286 #if (defined BLE_INCLUDED && BLE_INCLUDED == TRUE)
287 /* if l2cap command received in CID 1 on top of an LE link, ignore this command */
288 if (p_lcb->transport == BT_TRANSPORT_LE)
292 /* Reject the packet if it exceeds the default Signalling Channel MTU */
293 if (pkt_len > L2CAP_DEFAULT_MTU)
295 /* Core Spec requires a single response to the first command found in a multi-command
296 ** L2cap packet. If only responses in the packet, then it will be ignored.
297 ** Here we simply mark the bad packet and decide which cmd ID to reject later
300 L2CAP_TRACE_ERROR ("L2CAP SIG MTU Pkt Len Exceeded (672) -> pkt_len: %d", pkt_len);
304 p_pkt_end = p + pkt_len;
306 memset (&cfg_info, 0, sizeof(cfg_info));
308 /* An L2CAP packet may contain multiple commands */
311 /* Smallest command is 4 bytes */
312 if ((p = p_next_cmd) > (p_pkt_end - 4))
315 STREAM_TO_UINT8 (cmd_code, p);
316 STREAM_TO_UINT8 (id, p);
317 STREAM_TO_UINT16 (cmd_len, p);
319 /* Check command length does not exceed packet length */
320 if ((p_next_cmd = p + cmd_len) > p_pkt_end)
322 L2CAP_TRACE_WARNING ("Command len bad pkt_len: %d cmd_len: %d code: %d",
323 pkt_len, cmd_len, cmd_code);
327 L2CAP_TRACE_DEBUG ("cmd_code: %d, id:%d, cmd_len:%d", cmd_code, id, cmd_len);
329 /* Bad L2CAP packet length, look or cmd to reject */
332 /* If command found rejected it and we're done, otherwise keep looking */
333 if (l2c_is_cmd_rejected(cmd_code, id, p_lcb))
336 continue; /* Look for next cmd/response in current packet */
341 case L2CAP_CMD_REJECT:
342 if (p + 2 > p_next_cmd) {
343 android_errorWriteLog(0x534e4554, "74202041");
346 STREAM_TO_UINT16 (rej_reason, p);
347 if (rej_reason == L2CAP_CMD_REJ_MTU_EXCEEDED)
349 if (p + 2 > p_next_cmd) {
350 android_errorWriteLog(0x534e4554, "74202041");
353 STREAM_TO_UINT16 (rej_mtu, p);
354 /* What to do with the MTU reject ? We have negotiated an MTU. For now */
355 /* we will ignore it and let a higher protocol timeout take care of it */
357 L2CAP_TRACE_WARNING ("L2CAP - MTU rej Handle: %d MTU: %d", p_lcb->handle, rej_mtu);
359 if (rej_reason == L2CAP_CMD_REJ_INVALID_CID)
361 if (p + 4 > p_next_cmd) {
362 android_errorWriteLog(0x534e4554, "74202041");
365 STREAM_TO_UINT16 (rcid, p);
366 STREAM_TO_UINT16 (lcid, p);
368 L2CAP_TRACE_WARNING ("L2CAP - rej with CID invalid, LCID: 0x%04x RCID: 0x%04x", lcid, rcid);
370 /* Remote CID invalid. Treat as a disconnect */
371 if (((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
372 && (p_ccb->remote_cid == rcid))
374 /* Fake link disconnect - no reply is generated */
375 l2c_csm_execute (p_ccb, L2CEVT_LP_DISCONNECT_IND, NULL);
379 /* SonyEricsson Info request Bug workaround (Continue connection) */
380 else if (rej_reason == L2CAP_CMD_REJ_NOT_UNDERSTOOD && p_lcb->w4_info_rsp)
382 alarm_cancel(p_lcb->info_resp_timer);
384 p_lcb->w4_info_rsp = FALSE;
385 ci.status = HCI_SUCCESS;
386 memcpy (ci.bd_addr, p_lcb->remote_bd_addr, sizeof(BD_ADDR));
388 /* For all channels, send the event through their FSMs */
389 for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb)
391 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_INFO_RSP, &ci);
396 case L2CAP_CMD_CONN_REQ:
397 if (p + 4 > p_next_cmd) {
398 android_errorWriteLog(0x534e4554, "74202041");
401 STREAM_TO_UINT16 (con_info.psm, p);
402 STREAM_TO_UINT16 (rcid, p);
403 if ((p_rcb = l2cu_find_rcb_by_psm (con_info.psm)) == NULL)
405 L2CAP_TRACE_WARNING ("L2CAP - rcvd conn req for unknown PSM: %d", con_info.psm);
406 l2cu_reject_connection (p_lcb, rcid, id, L2CAP_CONN_NO_PSM);
411 if (!p_rcb->api.pL2CA_ConnectInd_Cb)
413 L2CAP_TRACE_WARNING ("L2CAP - rcvd conn req for outgoing-only connection PSM: %d", con_info.psm);
414 l2cu_reject_connection (p_lcb, rcid, id, L2CAP_CONN_NO_PSM);
418 if ((p_ccb = l2cu_allocate_ccb (p_lcb, 0)) == NULL)
420 L2CAP_TRACE_ERROR ("L2CAP - unable to allocate CCB");
421 l2cu_reject_connection (p_lcb, rcid, id, L2CAP_CONN_NO_RESOURCES);
424 p_ccb->remote_id = id;
425 p_ccb->p_rcb = p_rcb;
426 p_ccb->remote_cid = rcid;
428 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_REQ, &con_info);
431 case L2CAP_CMD_CONN_RSP:
432 if (p + 8 > p_next_cmd) {
433 android_errorWriteLog(0x534e4554, "74202041");
436 STREAM_TO_UINT16 (con_info.remote_cid, p);
437 STREAM_TO_UINT16 (lcid, p);
438 STREAM_TO_UINT16 (con_info.l2cap_result, p);
439 STREAM_TO_UINT16 (con_info.l2cap_status, p);
441 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) == NULL)
443 L2CAP_TRACE_WARNING ("L2CAP - no CCB for conn rsp, LCID: %d RCID: %d",
444 lcid, con_info.remote_cid);
447 if (p_ccb->local_id != id)
449 L2CAP_TRACE_WARNING ("L2CAP - con rsp - bad ID. Exp: %d Got: %d",
450 p_ccb->local_id, id);
454 if (con_info.l2cap_result == L2CAP_CONN_OK)
455 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP, &con_info);
456 else if (con_info.l2cap_result == L2CAP_CONN_PENDING)
457 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP_PND, &con_info);
459 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP_NEG, &con_info);
463 case L2CAP_CMD_CONFIG_REQ:
464 p_cfg_end = p + cmd_len;
468 if (p + 4 > p_next_cmd) {
469 android_errorWriteLog(0x534e4554, "74202041");
472 STREAM_TO_UINT16 (lcid, p);
473 STREAM_TO_UINT16 (cfg_info.flags, p);
477 cfg_info.flush_to_present = cfg_info.mtu_present = cfg_info.qos_present =
478 cfg_info.fcr_present = cfg_info.fcs_present = FALSE;
480 while (p < p_cfg_end)
482 if (p + 2 > p_next_cmd) {
483 android_errorWriteLog(0x534e4554, "74202041");
486 STREAM_TO_UINT8 (cfg_code, p);
487 STREAM_TO_UINT8 (cfg_len, p);
489 switch (cfg_code & 0x7F)
491 case L2CAP_CFG_TYPE_MTU:
492 cfg_info.mtu_present = TRUE;
494 android_errorWriteLog(0x534e4554, "119870451");
497 if (p + cfg_len > p_next_cmd) {
498 android_errorWriteLog(0x534e4554, "74202041");
501 STREAM_TO_UINT16 (cfg_info.mtu, p);
504 case L2CAP_CFG_TYPE_FLUSH_TOUT:
505 cfg_info.flush_to_present = TRUE;
507 android_errorWriteLog(0x534e4554, "119870451");
510 if (p + cfg_len > p_next_cmd) {
511 android_errorWriteLog(0x534e4554, "74202041");
514 STREAM_TO_UINT16 (cfg_info.flush_to, p);
517 case L2CAP_CFG_TYPE_QOS:
518 cfg_info.qos_present = TRUE;
519 if (cfg_len != 2 + 5 * 4) {
520 android_errorWriteLog(0x534e4554, "119870451");
523 if (p + cfg_len > p_next_cmd) {
524 android_errorWriteLog(0x534e4554, "74202041");
527 STREAM_TO_UINT8 (cfg_info.qos.qos_flags, p);
528 STREAM_TO_UINT8 (cfg_info.qos.service_type, p);
529 STREAM_TO_UINT32 (cfg_info.qos.token_rate, p);
530 STREAM_TO_UINT32 (cfg_info.qos.token_bucket_size, p);
531 STREAM_TO_UINT32 (cfg_info.qos.peak_bandwidth, p);
532 STREAM_TO_UINT32 (cfg_info.qos.latency, p);
533 STREAM_TO_UINT32 (cfg_info.qos.delay_variation, p);
536 case L2CAP_CFG_TYPE_FCR:
537 cfg_info.fcr_present = TRUE;
538 if (cfg_len != 3 + 3 * 2) {
539 android_errorWriteLog(0x534e4554, "119870451");
542 if (p + cfg_len > p_next_cmd) {
543 android_errorWriteLog(0x534e4554, "74202041");
546 STREAM_TO_UINT8 (cfg_info.fcr.mode, p);
547 STREAM_TO_UINT8 (cfg_info.fcr.tx_win_sz, p);
548 STREAM_TO_UINT8 (cfg_info.fcr.max_transmit, p);
549 STREAM_TO_UINT16 (cfg_info.fcr.rtrans_tout, p);
550 STREAM_TO_UINT16 (cfg_info.fcr.mon_tout, p);
551 STREAM_TO_UINT16 (cfg_info.fcr.mps, p);
554 case L2CAP_CFG_TYPE_FCS:
555 cfg_info.fcs_present = TRUE;
557 android_errorWriteLog(0x534e4554, "119870451");
560 if (p + cfg_len > p_next_cmd) {
561 android_errorWriteLog(0x534e4554, "74202041");
564 STREAM_TO_UINT8 (cfg_info.fcs, p);
567 case L2CAP_CFG_TYPE_EXT_FLOW:
568 cfg_info.ext_flow_spec_present = TRUE;
569 if (cfg_len != 1 + 2 + 3 * 4) {
570 android_errorWriteLog(0x534e4554, "119870451");
573 if (p + cfg_len > p_next_cmd) {
574 android_errorWriteLog(0x534e4554, "74202041");
577 STREAM_TO_UINT8 (cfg_info.ext_flow_spec.id, p);
578 STREAM_TO_UINT8 (cfg_info.ext_flow_spec.stype, p);
579 STREAM_TO_UINT16 (cfg_info.ext_flow_spec.max_sdu_size, p);
580 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.sdu_inter_time, p);
581 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.access_latency, p);
582 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.flush_timeout, p);
586 /* sanity check option length */
587 if ((cfg_len + L2CAP_CFG_OPTION_OVERHEAD) <= cmd_len)
589 if (p + cfg_len > p_next_cmd) {
590 android_errorWriteLog(0x534e4554, "79488381");
594 if ((cfg_code & 0x80) == 0)
596 cfg_rej_len += cfg_len + L2CAP_CFG_OPTION_OVERHEAD;
600 /* bad length; force loop exit */
610 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
612 p_ccb->remote_id = id;
615 l2cu_send_peer_config_rej (p_ccb, p_cfg_start, (UINT16) (cmd_len - L2CAP_CONFIG_REQ_LEN), cfg_rej_len);
619 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_CONFIG_REQ, &cfg_info);
624 /* updated spec says send command reject on invalid cid */
625 l2cu_send_peer_cmd_reject (p_lcb, L2CAP_CMD_REJ_INVALID_CID, id, 0, 0);
629 case L2CAP_CMD_CONFIG_RSP:
630 p_cfg_end = p + cmd_len;
631 if (p + 6 > p_next_cmd) {
632 android_errorWriteLog(0x534e4554, "74202041");
635 STREAM_TO_UINT16 (lcid, p);
636 STREAM_TO_UINT16 (cfg_info.flags, p);
637 STREAM_TO_UINT16 (cfg_info.result, p);
639 cfg_info.flush_to_present = cfg_info.mtu_present = cfg_info.qos_present =
640 cfg_info.fcr_present = cfg_info.fcs_present = FALSE;
642 while (p < p_cfg_end)
644 if (p + 2 > p_next_cmd) {
645 android_errorWriteLog(0x534e4554, "74202041");
648 STREAM_TO_UINT8 (cfg_code, p);
649 STREAM_TO_UINT8 (cfg_len, p);
651 switch (cfg_code & 0x7F)
653 case L2CAP_CFG_TYPE_MTU:
654 cfg_info.mtu_present = TRUE;
655 if (p + 2 > p_next_cmd) {
656 android_errorWriteLog(0x534e4554, "74202041");
659 STREAM_TO_UINT16 (cfg_info.mtu, p);
662 case L2CAP_CFG_TYPE_FLUSH_TOUT:
663 cfg_info.flush_to_present = TRUE;
664 if (p + 2 > p_next_cmd) {
665 android_errorWriteLog(0x534e4554, "74202041");
668 STREAM_TO_UINT16 (cfg_info.flush_to, p);
671 case L2CAP_CFG_TYPE_QOS:
672 cfg_info.qos_present = TRUE;
673 if (p + 2 + 5 * 4 > p_next_cmd) {
674 android_errorWriteLog(0x534e4554, "74202041");
677 STREAM_TO_UINT8 (cfg_info.qos.qos_flags, p);
678 STREAM_TO_UINT8 (cfg_info.qos.service_type, p);
679 STREAM_TO_UINT32 (cfg_info.qos.token_rate, p);
680 STREAM_TO_UINT32 (cfg_info.qos.token_bucket_size, p);
681 STREAM_TO_UINT32 (cfg_info.qos.peak_bandwidth, p);
682 STREAM_TO_UINT32 (cfg_info.qos.latency, p);
683 STREAM_TO_UINT32 (cfg_info.qos.delay_variation, p);
686 case L2CAP_CFG_TYPE_FCR:
687 cfg_info.fcr_present = TRUE;
688 if (p + 3 + 3 * 2 > p_next_cmd) {
689 android_errorWriteLog(0x534e4554, "74202041");
692 STREAM_TO_UINT8 (cfg_info.fcr.mode, p);
693 STREAM_TO_UINT8 (cfg_info.fcr.tx_win_sz, p);
694 STREAM_TO_UINT8 (cfg_info.fcr.max_transmit, p);
695 STREAM_TO_UINT16 (cfg_info.fcr.rtrans_tout, p);
696 STREAM_TO_UINT16 (cfg_info.fcr.mon_tout, p);
697 STREAM_TO_UINT16 (cfg_info.fcr.mps, p);
700 case L2CAP_CFG_TYPE_FCS:
701 cfg_info.fcs_present = TRUE;
702 if (p + 1 > p_next_cmd) {
703 android_errorWriteLog(0x534e4554, "74202041");
706 STREAM_TO_UINT8 (cfg_info.fcs, p);
709 case L2CAP_CFG_TYPE_EXT_FLOW:
710 cfg_info.ext_flow_spec_present = TRUE;
711 if (p + 2 + 2 + 3 * 4 > p_next_cmd) {
712 android_errorWriteLog(0x534e4554, "74202041");
715 STREAM_TO_UINT8 (cfg_info.ext_flow_spec.id, p);
716 STREAM_TO_UINT8 (cfg_info.ext_flow_spec.stype, p);
717 STREAM_TO_UINT16 (cfg_info.ext_flow_spec.max_sdu_size, p);
718 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.sdu_inter_time, p);
719 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.access_latency, p);
720 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.flush_timeout, p);
725 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
727 if (p_ccb->local_id != id)
729 L2CAP_TRACE_WARNING ("L2CAP - cfg rsp - bad ID. Exp: %d Got: %d",
730 p_ccb->local_id, id);
733 if ( (cfg_info.result == L2CAP_CFG_OK) || (cfg_info.result == L2CAP_CFG_PENDING) )
734 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_CONFIG_RSP, &cfg_info);
736 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_CONFIG_RSP_NEG, &cfg_info);
740 L2CAP_TRACE_WARNING ("L2CAP - rcvd cfg rsp for unknown CID: 0x%04x", lcid);
744 case L2CAP_CMD_DISC_REQ:
745 if (p + 4 > p_next_cmd) {
746 android_errorWriteLog(0x534e4554, "74202041");
749 STREAM_TO_UINT16 (lcid, p);
750 STREAM_TO_UINT16 (rcid, p);
752 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
754 if (p_ccb->remote_cid == rcid)
756 p_ccb->remote_id = id;
757 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DISCONNECT_REQ, &con_info);
761 l2cu_send_peer_disc_rsp (p_lcb, id, lcid, rcid);
765 case L2CAP_CMD_DISC_RSP:
766 if (p + 4 > p_next_cmd) {
767 android_errorWriteLog(0x534e4554, "74202041");
770 STREAM_TO_UINT16 (rcid, p);
771 STREAM_TO_UINT16 (lcid, p);
773 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
775 if ((p_ccb->remote_cid == rcid) && (p_ccb->local_id == id))
777 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DISCONNECT_RSP, &con_info);
782 case L2CAP_CMD_ECHO_REQ:
783 l2cu_send_peer_echo_rsp (p_lcb, id, NULL, 0);
786 case L2CAP_CMD_ECHO_RSP:
787 if (p_lcb->p_echo_rsp_cb)
789 tL2CA_ECHO_RSP_CB *p_cb = p_lcb->p_echo_rsp_cb;
791 /* Zero out the callback in case app immediately calls us again */
792 p_lcb->p_echo_rsp_cb = NULL;
794 (*p_cb) (L2CAP_PING_RESULT_OK);
798 case L2CAP_CMD_INFO_REQ:
799 if (p + 2 > p_next_cmd) {
800 android_errorWriteLog(0x534e4554, "74202041");
803 STREAM_TO_UINT16 (info_type, p);
804 l2cu_send_peer_info_rsp (p_lcb, id, info_type);
807 case L2CAP_CMD_INFO_RSP:
808 /* Stop the link connect timer if sent before L2CAP connection is up */
809 if (p_lcb->w4_info_rsp)
811 alarm_cancel(p_lcb->info_resp_timer);
812 p_lcb->w4_info_rsp = FALSE;
815 if (p + 4 > p_next_cmd) {
816 android_errorWriteLog(0x534e4554, "74202041");
819 STREAM_TO_UINT16 (info_type, p);
820 STREAM_TO_UINT16 (result, p);
822 p_lcb->info_rx_bits |= (1 << info_type);
824 if ( (info_type == L2CAP_EXTENDED_FEATURES_INFO_TYPE)
825 && (result == L2CAP_INFO_RESP_RESULT_SUCCESS) )
827 if (p + 4 > p_next_cmd) {
828 android_errorWriteLog(0x534e4554, "74202041");
831 STREAM_TO_UINT32( p_lcb->peer_ext_fea, p );
833 #if (L2CAP_NUM_FIXED_CHNLS > 0)
834 if (p_lcb->peer_ext_fea & L2CAP_EXTFEA_FIXED_CHNLS)
836 l2cu_send_peer_info_req (p_lcb, L2CAP_FIXED_CHANNELS_INFO_TYPE);
841 l2cu_process_fixed_chnl_resp (p_lcb);
846 #if (L2CAP_NUM_FIXED_CHNLS > 0)
847 if (info_type == L2CAP_FIXED_CHANNELS_INFO_TYPE)
849 if (result == L2CAP_INFO_RESP_RESULT_SUCCESS)
851 memcpy (p_lcb->peer_chnl_mask, p, L2CAP_FIXED_CHNL_ARRAY_SIZE);
854 l2cu_process_fixed_chnl_resp (p_lcb);
857 #if (L2CAP_UCD_INCLUDED == TRUE)
858 else if (info_type == L2CAP_CONNLESS_MTU_INFO_TYPE)
860 if (result == L2CAP_INFO_RESP_RESULT_SUCCESS)
862 if (p + 2 > p_next_cmd) {
863 android_errorWriteLog(0x534e4554, "74202041");
866 STREAM_TO_UINT16 (p_lcb->ucd_mtu, p);
871 ci.status = HCI_SUCCESS;
872 memcpy (ci.bd_addr, p_lcb->remote_bd_addr, sizeof(BD_ADDR));
873 for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb)
875 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_INFO_RSP, &ci);
880 L2CAP_TRACE_WARNING ("L2CAP - bad cmd code: %d", cmd_code);
881 l2cu_send_peer_cmd_reject (p_lcb, L2CAP_CMD_REJ_NOT_UNDERSTOOD, id, 0, 0);
887 /*******************************************************************************
889 ** Function l2c_process_held_packets
891 ** Description This function processes any L2CAP packets that arrived before
892 ** the HCI connection complete arrived. It is a work around for
893 ** badly behaved controllers.
897 *******************************************************************************/
898 void l2c_process_held_packets(BOOLEAN timed_out) {
899 if (list_is_empty(l2cb.rcv_pending_q))
903 alarm_cancel(l2cb.receive_hold_timer);
904 L2CAP_TRACE_WARNING("L2CAP HOLD CONTINUE");
906 L2CAP_TRACE_WARNING("L2CAP HOLD TIMEOUT");
909 for (const list_node_t *node = list_begin(l2cb.rcv_pending_q);
910 node != list_end(l2cb.rcv_pending_q);) {
911 BT_HDR *p_buf = list_node(node);
912 node = list_next(node);
913 if (!timed_out || (!p_buf->layer_specific) || (--p_buf->layer_specific == 0)) {
914 list_remove(l2cb.rcv_pending_q, p_buf);
915 p_buf->layer_specific = 0xFFFF;
916 l2c_rcv_acl_data(p_buf);
920 /* If anyone still in the queue, restart the timeout */
921 if (!list_is_empty(l2cb.rcv_pending_q)) {
922 alarm_set_on_queue(l2cb.receive_hold_timer, BT_1SEC_TIMEOUT_MS,
923 l2c_receive_hold_timer_timeout, NULL,
924 btu_general_alarm_queue);
928 /*******************************************************************************
932 ** Description This function is called once at startup to initialize
933 ** all the L2CAP structures
937 *******************************************************************************/
942 memset (&l2cb, 0, sizeof (tL2C_CB));
943 /* the psm is increased by 2 before being used */
944 l2cb.dyn_psm = 0xFFF;
946 /* Put all the channel control blocks on the free queue */
947 for (xx = 0; xx < MAX_L2CAP_CHANNELS - 1; xx++)
949 l2cb.ccb_pool[xx].p_next_ccb = &l2cb.ccb_pool[xx + 1];
952 #if (L2CAP_NON_FLUSHABLE_PB_INCLUDED == TRUE)
953 /* it will be set to L2CAP_PKT_START_NON_FLUSHABLE if controller supports */
954 l2cb.non_flushable_pbf = L2CAP_PKT_START << L2CAP_PKT_TYPE_SHIFT;
957 l2cb.p_free_ccb_first = &l2cb.ccb_pool[0];
958 l2cb.p_free_ccb_last = &l2cb.ccb_pool[MAX_L2CAP_CHANNELS - 1];
960 #ifdef L2CAP_DESIRED_LINK_ROLE
961 l2cb.desire_role = L2CAP_DESIRED_LINK_ROLE;
963 l2cb.desire_role = HCI_ROLE_SLAVE;
966 /* Set the default idle timeout */
967 l2cb.idle_timeout = L2CAP_LINK_INACTIVITY_TOUT;
969 #if defined(L2CAP_INITIAL_TRACE_LEVEL)
970 l2cb.l2cap_trace_level = L2CAP_INITIAL_TRACE_LEVEL;
972 l2cb.l2cap_trace_level = BT_TRACE_LEVEL_NONE; /* No traces */
975 #if L2CAP_CONFORMANCE_TESTING == TRUE
976 /* Conformance testing needs a dynamic response */
977 l2cb.test_info_resp = L2CAP_EXTFEA_SUPPORTED_MASK;
980 /* Number of ACL buffers to use for high priority channel */
981 #if (defined(L2CAP_HIGH_PRI_CHAN_QUOTA_IS_CONFIGURABLE) && (L2CAP_HIGH_PRI_CHAN_QUOTA_IS_CONFIGURABLE == TRUE))
982 l2cb.high_pri_min_xmit_quota = L2CAP_HIGH_PRI_MIN_XMIT_QUOTA;
985 #if BLE_INCLUDED == TRUE
986 l2cb.l2c_ble_fixed_chnls_mask =
987 L2CAP_FIXED_CHNL_ATT_BIT | L2CAP_FIXED_CHNL_BLE_SIG_BIT | L2CAP_FIXED_CHNL_SMP_BIT;
990 l2cb.rcv_pending_q = list_new(NULL);
991 if (l2cb.rcv_pending_q == NULL)
992 LOG_ERROR(LOG_TAG, "%s unable to allocate memory for link layer control block", __func__);
993 l2cb.receive_hold_timer = alarm_new("l2c.receive_hold_timer");
996 void l2c_free(void) {
997 list_free(l2cb.rcv_pending_q);
998 l2cb.rcv_pending_q = NULL;
1001 void l2c_receive_hold_timer_timeout(UNUSED_ATTR void *data)
1003 /* Update the timeouts in the hold queue */
1004 l2c_process_held_packets(TRUE);
1007 void l2c_ccb_timer_timeout(void *data)
1009 tL2C_CCB *p_ccb = (tL2C_CCB *)data;
1011 l2c_csm_execute(p_ccb, L2CEVT_TIMEOUT, NULL);
1014 void l2c_fcrb_ack_timer_timeout(void *data)
1016 tL2C_CCB *p_ccb = (tL2C_CCB *)data;
1018 l2c_csm_execute(p_ccb, L2CEVT_ACK_TIMEOUT, NULL);
1021 void l2c_lcb_timer_timeout(void *data)
1023 tL2C_LCB *p_lcb = (tL2C_LCB *)data;
1025 l2c_link_timeout(p_lcb);
1028 /*******************************************************************************
1030 ** Function l2c_data_write
1032 ** Description API functions call this function to write data.
1034 ** Returns L2CAP_DW_SUCCESS, if data accepted, else FALSE
1035 ** L2CAP_DW_CONGESTED, if data accepted and the channel is congested
1036 ** L2CAP_DW_FAILED, if error
1038 *******************************************************************************/
1039 UINT8 l2c_data_write (UINT16 cid, BT_HDR *p_data, UINT16 flags)
1043 /* Find the channel control block. We don't know the link it is on. */
1044 if ((p_ccb = l2cu_find_ccb_by_cid (NULL, cid)) == NULL)
1046 L2CAP_TRACE_WARNING ("L2CAP - no CCB for L2CA_DataWrite, CID: %d", cid);
1048 return (L2CAP_DW_FAILED);
1051 #ifndef TESTER /* Tester may send any amount of data. otherwise sending message
1052 bigger than mtu size of peer is a violation of protocol */
1055 if (p_ccb->p_lcb->transport == BT_TRANSPORT_LE)
1056 mtu = p_ccb->peer_conn_cfg.mtu;
1058 mtu = p_ccb->peer_cfg.mtu;
1060 if (p_data->len > mtu)
1062 L2CAP_TRACE_WARNING ("L2CAP - CID: 0x%04x cannot send message bigger than peer's mtu size", cid);
1064 return (L2CAP_DW_FAILED);
1068 /* channel based, packet based flushable or non-flushable */
1069 p_data->layer_specific = flags;
1071 /* If already congested, do not accept any more packets */
1072 if (p_ccb->cong_sent)
1074 L2CAP_TRACE_ERROR ("L2CAP - CID: 0x%04x cannot send, already congested xmit_hold_q.count: %u buff_quota: %u",
1076 fixed_queue_length(p_ccb->xmit_hold_q),
1080 return (L2CAP_DW_FAILED);
1084 l2c_csm_execute (p_ccb, L2CEVT_L2CA_DATA_WRITE, p_data);
1086 if (p_ccb->cong_sent)
1087 return (L2CAP_DW_CONGESTED);
1089 return (L2CAP_DW_SUCCESS);