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"
31 #include "bt_target.h"
34 #include "device/include/controller.h"
35 #include "bt_common.h"
40 #include "osi/include/log.h"
43 extern fixed_queue_t *btu_general_alarm_queue;
45 /********************************************************************************/
46 /* L O C A L F U N C T I O N P R O T O T Y P E S */
47 /********************************************************************************/
48 static void process_l2cap_cmd (tL2C_LCB *p_lcb, UINT8 *p, UINT16 pkt_len);
50 /********************************************************************************/
51 /* G L O B A L L 2 C A P D A T A */
52 /********************************************************************************/
53 #if L2C_DYNAMIC_MEMORY == FALSE
57 /*******************************************************************************
59 ** Function l2c_rcv_acl_data
61 ** Description This function is called from the HCI Interface when an ACL
62 ** data packet is received.
66 *******************************************************************************/
67 void l2c_rcv_acl_data (BT_HDR *p_msg)
69 UINT8 *p = (UINT8 *)(p_msg + 1) + p_msg->offset;
70 UINT16 handle, hci_len;
73 tL2C_CCB *p_ccb = NULL;
74 UINT16 l2cap_len, rcv_cid, psm;
77 /* Extract the handle */
78 STREAM_TO_UINT16 (handle, p);
79 pkt_type = HCID_GET_EVENT (handle);
80 handle = HCID_GET_HANDLE (handle);
82 /* Since the HCI Transport is putting segmented packets back together, we */
83 /* should never get a valid packet with the type set to "continuation" */
84 if (pkt_type != L2CAP_PKT_CONTINUE)
86 /* Find the LCB based on the handle */
87 if ((p_lcb = l2cu_find_lcb_by_handle (handle)) == NULL)
91 /* There is a slight possibility (specifically with USB) that we get an */
92 /* L2CAP connection request before we get the HCI connection complete. */
93 /* So for these types of messages, hold them for up to 2 seconds. */
94 STREAM_TO_UINT16 (hci_len, p);
95 STREAM_TO_UINT16 (l2cap_len, p);
96 STREAM_TO_UINT16 (rcv_cid, p);
97 STREAM_TO_UINT8 (cmd_code, p);
99 if ((p_msg->layer_specific == 0) && (rcv_cid == L2CAP_SIGNALLING_CID)
100 && (cmd_code == L2CAP_CMD_INFO_REQ || cmd_code == L2CAP_CMD_CONN_REQ)) {
101 L2CAP_TRACE_WARNING ("L2CAP - holding ACL for unknown handle:%d ls:%d"
102 " cid:%d opcode:%d cur count:%d", handle, p_msg->layer_specific,
103 rcv_cid, cmd_code, list_length(l2cb.rcv_pending_q));
104 p_msg->layer_specific = 2;
105 list_append(l2cb.rcv_pending_q, p_msg);
107 if (list_length(l2cb.rcv_pending_q) == 1) {
108 alarm_set_on_queue(l2cb.receive_hold_timer,
110 l2c_receive_hold_timer_timeout, NULL,
111 btu_general_alarm_queue);
116 L2CAP_TRACE_ERROR ("L2CAP - rcvd ACL for unknown handle:%d ls:%d cid:%d"
117 " opcode:%d cur count:%d", handle, p_msg->layer_specific, rcv_cid,
118 cmd_code, list_length(l2cb.rcv_pending_q));
126 L2CAP_TRACE_WARNING ("L2CAP - expected pkt start or complete, got: %d", pkt_type);
131 /* Extract the length and update the buffer header */
132 STREAM_TO_UINT16 (hci_len, p);
135 /* Extract the length and CID */
136 STREAM_TO_UINT16 (l2cap_len, p);
137 STREAM_TO_UINT16 (rcv_cid, p);
139 #if BLE_INCLUDED == TRUE
140 /* for BLE channel, always notify connection when ACL data received on the link */
141 if (p_lcb && p_lcb->transport == BT_TRANSPORT_LE && p_lcb->link_state != LST_DISCONNECTING)
142 /* only process fixed channel data as channel open indication when link is not in disconnecting mode */
143 l2cble_notify_le_connection(p_lcb->remote_bd_addr);
146 /* Find the CCB for this CID */
147 if (rcv_cid >= L2CAP_BASE_APPL_CID)
149 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, rcv_cid)) == NULL)
151 L2CAP_TRACE_WARNING ("L2CAP - unknown CID: 0x%04x", rcv_cid);
157 if (hci_len >= L2CAP_PKT_OVERHEAD) /* Must receive at least the L2CAP length and CID.*/
159 p_msg->len = hci_len - L2CAP_PKT_OVERHEAD;
160 p_msg->offset += L2CAP_PKT_OVERHEAD;
164 L2CAP_TRACE_WARNING ("L2CAP - got incorrect hci header" );
169 if (l2cap_len != p_msg->len)
171 L2CAP_TRACE_WARNING ("L2CAP - bad length in pkt. Exp: %d Act: %d",
172 l2cap_len, p_msg->len);
178 /* Send the data through the channel state machine */
179 if (rcv_cid == L2CAP_SIGNALLING_CID)
181 process_l2cap_cmd (p_lcb, p, l2cap_len);
184 else if (rcv_cid == L2CAP_CONNECTIONLESS_CID)
186 /* process_connectionless_data (p_lcb); */
187 STREAM_TO_UINT16 (psm, p);
188 L2CAP_TRACE_DEBUG( "GOT CONNECTIONLESS DATA PSM:%d", psm ) ;
190 #if (L2CAP_UCD_INCLUDED == TRUE)
191 /* if it is not broadcast, check UCD registration */
192 if ( l2c_ucd_check_rx_pkts( p_lcb, p_msg ) )
200 #if (BLE_INCLUDED == TRUE)
201 else if (rcv_cid == L2CAP_BLE_SIGNALLING_CID)
203 l2cble_process_sig_cmd (p_lcb, p, l2cap_len);
207 #if (L2CAP_NUM_FIXED_CHNLS > 0)
208 else if ((rcv_cid >= L2CAP_FIRST_FIXED_CHNL) && (rcv_cid <= L2CAP_LAST_FIXED_CHNL) &&
209 (l2cb.fixed_reg[rcv_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb != NULL) )
211 /* If no CCB for this channel, allocate one */
213 /* only process fixed channel data when link is open or wait for data indication */
214 (p_lcb->link_state != LST_DISCONNECTING) &&
215 l2cu_initialize_fixed_ccb (p_lcb, rcv_cid, &l2cb.fixed_reg[rcv_cid - L2CAP_FIRST_FIXED_CHNL].fixed_chnl_opts))
217 p_ccb = p_lcb->p_fixed_ccbs[rcv_cid - L2CAP_FIRST_FIXED_CHNL];
219 if (p_ccb->peer_cfg.fcr.mode != L2CAP_FCR_BASIC_MODE)
220 l2c_fcr_proc_pdu (p_ccb, p_msg);
222 (*l2cb.fixed_reg[rcv_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb)
223 (rcv_cid, p_lcb->remote_bd_addr, p_msg);
236 if (p_lcb->transport == BT_TRANSPORT_LE)
238 l2c_lcc_proc_pdu(p_ccb,p_msg);
239 // Got a pkt, valid send out credits to the peer device
240 credit = L2CAP_LE_DEFAULT_CREDIT;
241 l2c_csm_execute(p_ccb, L2CEVT_L2CA_SEND_FLOW_CONTROL_CREDIT, &credit);
245 /* Basic mode packets go straight to the state machine */
246 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_BASIC_MODE)
247 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DATA, p_msg);
250 /* eRTM or streaming mode, so we need to validate states first */
251 if ((p_ccb->chnl_state == CST_OPEN) || (p_ccb->chnl_state == CST_CONFIG))
252 l2c_fcr_proc_pdu (p_ccb, p_msg);
261 /*******************************************************************************
263 ** Function process_l2cap_cmd
265 ** Description This function is called when a packet is received on the
266 ** L2CAP signalling CID
270 *******************************************************************************/
271 static void process_l2cap_cmd (tL2C_LCB *p_lcb, UINT8 *p, UINT16 pkt_len)
273 UINT8 *p_pkt_end, *p_next_cmd, *p_cfg_end, *p_cfg_start;
274 UINT8 cmd_code, cfg_code, cfg_len, id;
275 tL2C_CONN_INFO con_info;
276 tL2CAP_CFG_INFO cfg_info;
277 UINT16 rej_reason, rej_mtu, lcid, rcid, info_type;
280 BOOLEAN cfg_rej, pkt_size_rej = FALSE;
281 UINT16 cfg_rej_len, cmd_len;
285 #if (defined BLE_INCLUDED && BLE_INCLUDED == TRUE)
286 /* if l2cap command received in CID 1 on top of an LE link, ignore this command */
287 if (p_lcb->transport == BT_TRANSPORT_LE)
291 /* Reject the packet if it exceeds the default Signalling Channel MTU */
292 if (pkt_len > L2CAP_DEFAULT_MTU)
294 /* Core Spec requires a single response to the first command found in a multi-command
295 ** L2cap packet. If only responses in the packet, then it will be ignored.
296 ** Here we simply mark the bad packet and decide which cmd ID to reject later
299 L2CAP_TRACE_ERROR ("L2CAP SIG MTU Pkt Len Exceeded (672) -> pkt_len: %d", pkt_len);
303 p_pkt_end = p + pkt_len;
305 memset (&cfg_info, 0, sizeof(cfg_info));
307 /* An L2CAP packet may contain multiple commands */
310 /* Smallest command is 4 bytes */
311 if ((p = p_next_cmd) > (p_pkt_end - 4))
314 STREAM_TO_UINT8 (cmd_code, p);
315 STREAM_TO_UINT8 (id, p);
316 STREAM_TO_UINT16 (cmd_len, p);
318 /* Check command length does not exceed packet length */
319 if ((p_next_cmd = p + cmd_len) > p_pkt_end)
321 L2CAP_TRACE_WARNING ("Command len bad pkt_len: %d cmd_len: %d code: %d",
322 pkt_len, cmd_len, cmd_code);
326 L2CAP_TRACE_DEBUG ("cmd_code: %d, id:%d, cmd_len:%d", cmd_code, id, cmd_len);
328 /* Bad L2CAP packet length, look or cmd to reject */
331 /* If command found rejected it and we're done, otherwise keep looking */
332 if (l2c_is_cmd_rejected(cmd_code, id, p_lcb))
335 continue; /* Look for next cmd/response in current packet */
340 case L2CAP_CMD_REJECT:
341 STREAM_TO_UINT16 (rej_reason, p);
342 if (rej_reason == L2CAP_CMD_REJ_MTU_EXCEEDED)
344 STREAM_TO_UINT16 (rej_mtu, p);
345 /* What to do with the MTU reject ? We have negotiated an MTU. For now */
346 /* we will ignore it and let a higher protocol timeout take care of it */
348 L2CAP_TRACE_WARNING ("L2CAP - MTU rej Handle: %d MTU: %d", p_lcb->handle, rej_mtu);
350 if (rej_reason == L2CAP_CMD_REJ_INVALID_CID)
352 STREAM_TO_UINT16 (rcid, p);
353 STREAM_TO_UINT16 (lcid, p);
355 L2CAP_TRACE_WARNING ("L2CAP - rej with CID invalid, LCID: 0x%04x RCID: 0x%04x", lcid, rcid);
357 /* Remote CID invalid. Treat as a disconnect */
358 if (((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
359 && (p_ccb->remote_cid == rcid))
361 /* Fake link disconnect - no reply is generated */
362 l2c_csm_execute (p_ccb, L2CEVT_LP_DISCONNECT_IND, NULL);
366 /* SonyEricsson Info request Bug workaround (Continue connection) */
367 else if (rej_reason == L2CAP_CMD_REJ_NOT_UNDERSTOOD && p_lcb->w4_info_rsp)
369 alarm_cancel(p_lcb->info_resp_timer);
371 p_lcb->w4_info_rsp = FALSE;
372 ci.status = HCI_SUCCESS;
373 memcpy (ci.bd_addr, p_lcb->remote_bd_addr, sizeof(BD_ADDR));
375 /* For all channels, send the event through their FSMs */
376 for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb)
378 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_INFO_RSP, &ci);
383 case L2CAP_CMD_CONN_REQ:
384 STREAM_TO_UINT16 (con_info.psm, p);
385 STREAM_TO_UINT16 (rcid, p);
386 if ((p_rcb = l2cu_find_rcb_by_psm (con_info.psm)) == NULL)
388 L2CAP_TRACE_WARNING ("L2CAP - rcvd conn req for unknown PSM: %d", con_info.psm);
389 l2cu_reject_connection (p_lcb, rcid, id, L2CAP_CONN_NO_PSM);
394 if (!p_rcb->api.pL2CA_ConnectInd_Cb)
396 L2CAP_TRACE_WARNING ("L2CAP - rcvd conn req for outgoing-only connection PSM: %d", con_info.psm);
397 l2cu_reject_connection (p_lcb, rcid, id, L2CAP_CONN_NO_PSM);
401 if ((p_ccb = l2cu_allocate_ccb (p_lcb, 0)) == NULL)
403 L2CAP_TRACE_ERROR ("L2CAP - unable to allocate CCB");
404 l2cu_reject_connection (p_lcb, rcid, id, L2CAP_CONN_NO_RESOURCES);
407 p_ccb->remote_id = id;
408 p_ccb->p_rcb = p_rcb;
409 p_ccb->remote_cid = rcid;
411 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_REQ, &con_info);
414 case L2CAP_CMD_CONN_RSP:
415 STREAM_TO_UINT16 (con_info.remote_cid, p);
416 STREAM_TO_UINT16 (lcid, p);
417 STREAM_TO_UINT16 (con_info.l2cap_result, p);
418 STREAM_TO_UINT16 (con_info.l2cap_status, p);
420 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) == NULL)
422 L2CAP_TRACE_WARNING ("L2CAP - no CCB for conn rsp, LCID: %d RCID: %d",
423 lcid, con_info.remote_cid);
426 if (p_ccb->local_id != id)
428 L2CAP_TRACE_WARNING ("L2CAP - con rsp - bad ID. Exp: %d Got: %d",
429 p_ccb->local_id, id);
433 if (con_info.l2cap_result == L2CAP_CONN_OK)
434 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP, &con_info);
435 else if (con_info.l2cap_result == L2CAP_CONN_PENDING)
436 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP_PND, &con_info);
438 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP_NEG, &con_info);
442 case L2CAP_CMD_CONFIG_REQ:
443 p_cfg_end = p + cmd_len;
447 STREAM_TO_UINT16 (lcid, p);
448 STREAM_TO_UINT16 (cfg_info.flags, p);
452 cfg_info.flush_to_present = cfg_info.mtu_present = cfg_info.qos_present =
453 cfg_info.fcr_present = cfg_info.fcs_present = FALSE;
455 while (p < p_cfg_end)
457 STREAM_TO_UINT8 (cfg_code, p);
458 STREAM_TO_UINT8 (cfg_len, p);
460 switch (cfg_code & 0x7F)
462 case L2CAP_CFG_TYPE_MTU:
463 cfg_info.mtu_present = TRUE;
464 STREAM_TO_UINT16 (cfg_info.mtu, p);
467 case L2CAP_CFG_TYPE_FLUSH_TOUT:
468 cfg_info.flush_to_present = TRUE;
469 STREAM_TO_UINT16 (cfg_info.flush_to, p);
472 case L2CAP_CFG_TYPE_QOS:
473 cfg_info.qos_present = TRUE;
474 STREAM_TO_UINT8 (cfg_info.qos.qos_flags, p);
475 STREAM_TO_UINT8 (cfg_info.qos.service_type, p);
476 STREAM_TO_UINT32 (cfg_info.qos.token_rate, p);
477 STREAM_TO_UINT32 (cfg_info.qos.token_bucket_size, p);
478 STREAM_TO_UINT32 (cfg_info.qos.peak_bandwidth, p);
479 STREAM_TO_UINT32 (cfg_info.qos.latency, p);
480 STREAM_TO_UINT32 (cfg_info.qos.delay_variation, p);
483 case L2CAP_CFG_TYPE_FCR:
484 cfg_info.fcr_present = TRUE;
485 STREAM_TO_UINT8 (cfg_info.fcr.mode, p);
486 STREAM_TO_UINT8 (cfg_info.fcr.tx_win_sz, p);
487 STREAM_TO_UINT8 (cfg_info.fcr.max_transmit, p);
488 STREAM_TO_UINT16 (cfg_info.fcr.rtrans_tout, p);
489 STREAM_TO_UINT16 (cfg_info.fcr.mon_tout, p);
490 STREAM_TO_UINT16 (cfg_info.fcr.mps, p);
493 case L2CAP_CFG_TYPE_FCS:
494 cfg_info.fcs_present = TRUE;
495 STREAM_TO_UINT8 (cfg_info.fcs, p);
498 case L2CAP_CFG_TYPE_EXT_FLOW:
499 cfg_info.ext_flow_spec_present = TRUE;
500 STREAM_TO_UINT8 (cfg_info.ext_flow_spec.id, p);
501 STREAM_TO_UINT8 (cfg_info.ext_flow_spec.stype, p);
502 STREAM_TO_UINT16 (cfg_info.ext_flow_spec.max_sdu_size, p);
503 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.sdu_inter_time, p);
504 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.access_latency, p);
505 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.flush_timeout, p);
509 /* sanity check option length */
510 if ((cfg_len + L2CAP_CFG_OPTION_OVERHEAD) <= cmd_len)
513 if ((cfg_code & 0x80) == 0)
515 cfg_rej_len += cfg_len + L2CAP_CFG_OPTION_OVERHEAD;
519 /* bad length; force loop exit */
529 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
531 p_ccb->remote_id = id;
534 l2cu_send_peer_config_rej (p_ccb, p_cfg_start, (UINT16) (cmd_len - L2CAP_CONFIG_REQ_LEN), cfg_rej_len);
538 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_CONFIG_REQ, &cfg_info);
543 /* updated spec says send command reject on invalid cid */
544 l2cu_send_peer_cmd_reject (p_lcb, L2CAP_CMD_REJ_INVALID_CID, id, 0, 0);
548 case L2CAP_CMD_CONFIG_RSP:
549 p_cfg_end = p + cmd_len;
550 STREAM_TO_UINT16 (lcid, p);
551 STREAM_TO_UINT16 (cfg_info.flags, p);
552 STREAM_TO_UINT16 (cfg_info.result, p);
554 cfg_info.flush_to_present = cfg_info.mtu_present = cfg_info.qos_present =
555 cfg_info.fcr_present = cfg_info.fcs_present = FALSE;
557 while (p < p_cfg_end)
559 STREAM_TO_UINT8 (cfg_code, p);
560 STREAM_TO_UINT8 (cfg_len, p);
562 switch (cfg_code & 0x7F)
564 case L2CAP_CFG_TYPE_MTU:
565 cfg_info.mtu_present = TRUE;
566 STREAM_TO_UINT16 (cfg_info.mtu, p);
569 case L2CAP_CFG_TYPE_FLUSH_TOUT:
570 cfg_info.flush_to_present = TRUE;
571 STREAM_TO_UINT16 (cfg_info.flush_to, p);
574 case L2CAP_CFG_TYPE_QOS:
575 cfg_info.qos_present = TRUE;
576 STREAM_TO_UINT8 (cfg_info.qos.qos_flags, p);
577 STREAM_TO_UINT8 (cfg_info.qos.service_type, p);
578 STREAM_TO_UINT32 (cfg_info.qos.token_rate, p);
579 STREAM_TO_UINT32 (cfg_info.qos.token_bucket_size, p);
580 STREAM_TO_UINT32 (cfg_info.qos.peak_bandwidth, p);
581 STREAM_TO_UINT32 (cfg_info.qos.latency, p);
582 STREAM_TO_UINT32 (cfg_info.qos.delay_variation, p);
585 case L2CAP_CFG_TYPE_FCR:
586 cfg_info.fcr_present = TRUE;
587 STREAM_TO_UINT8 (cfg_info.fcr.mode, p);
588 STREAM_TO_UINT8 (cfg_info.fcr.tx_win_sz, p);
589 STREAM_TO_UINT8 (cfg_info.fcr.max_transmit, p);
590 STREAM_TO_UINT16 (cfg_info.fcr.rtrans_tout, p);
591 STREAM_TO_UINT16 (cfg_info.fcr.mon_tout, p);
592 STREAM_TO_UINT16 (cfg_info.fcr.mps, p);
595 case L2CAP_CFG_TYPE_FCS:
596 cfg_info.fcs_present = TRUE;
597 STREAM_TO_UINT8 (cfg_info.fcs, p);
600 case L2CAP_CFG_TYPE_EXT_FLOW:
601 cfg_info.ext_flow_spec_present = TRUE;
602 STREAM_TO_UINT8 (cfg_info.ext_flow_spec.id, p);
603 STREAM_TO_UINT8 (cfg_info.ext_flow_spec.stype, p);
604 STREAM_TO_UINT16 (cfg_info.ext_flow_spec.max_sdu_size, p);
605 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.sdu_inter_time, p);
606 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.access_latency, p);
607 STREAM_TO_UINT32 (cfg_info.ext_flow_spec.flush_timeout, p);
612 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
614 if (p_ccb->local_id != id)
616 L2CAP_TRACE_WARNING ("L2CAP - cfg rsp - bad ID. Exp: %d Got: %d",
617 p_ccb->local_id, id);
620 if ( (cfg_info.result == L2CAP_CFG_OK) || (cfg_info.result == L2CAP_CFG_PENDING) )
621 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_CONFIG_RSP, &cfg_info);
623 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_CONFIG_RSP_NEG, &cfg_info);
627 L2CAP_TRACE_WARNING ("L2CAP - rcvd cfg rsp for unknown CID: 0x%04x", lcid);
631 case L2CAP_CMD_DISC_REQ:
632 STREAM_TO_UINT16 (lcid, p);
633 STREAM_TO_UINT16 (rcid, p);
635 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
637 if (p_ccb->remote_cid == rcid)
639 p_ccb->remote_id = id;
640 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DISCONNECT_REQ, &con_info);
644 l2cu_send_peer_disc_rsp (p_lcb, id, lcid, rcid);
648 case L2CAP_CMD_DISC_RSP:
649 STREAM_TO_UINT16 (rcid, p);
650 STREAM_TO_UINT16 (lcid, p);
652 if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
654 if ((p_ccb->remote_cid == rcid) && (p_ccb->local_id == id))
656 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DISCONNECT_RSP, &con_info);
661 case L2CAP_CMD_ECHO_REQ:
662 l2cu_send_peer_echo_rsp (p_lcb, id, NULL, 0);
665 case L2CAP_CMD_ECHO_RSP:
666 if (p_lcb->p_echo_rsp_cb)
668 tL2CA_ECHO_RSP_CB *p_cb = p_lcb->p_echo_rsp_cb;
670 /* Zero out the callback in case app immediately calls us again */
671 p_lcb->p_echo_rsp_cb = NULL;
673 (*p_cb) (L2CAP_PING_RESULT_OK);
677 case L2CAP_CMD_INFO_REQ:
678 STREAM_TO_UINT16 (info_type, p);
679 l2cu_send_peer_info_rsp (p_lcb, id, info_type);
682 case L2CAP_CMD_INFO_RSP:
683 /* Stop the link connect timer if sent before L2CAP connection is up */
684 if (p_lcb->w4_info_rsp)
686 alarm_cancel(p_lcb->info_resp_timer);
687 p_lcb->w4_info_rsp = FALSE;
690 STREAM_TO_UINT16 (info_type, p);
691 STREAM_TO_UINT16 (result, p);
693 p_lcb->info_rx_bits |= (1 << info_type);
695 if ( (info_type == L2CAP_EXTENDED_FEATURES_INFO_TYPE)
696 && (result == L2CAP_INFO_RESP_RESULT_SUCCESS) )
698 STREAM_TO_UINT32( p_lcb->peer_ext_fea, p );
700 #if (L2CAP_NUM_FIXED_CHNLS > 0)
701 if (p_lcb->peer_ext_fea & L2CAP_EXTFEA_FIXED_CHNLS)
703 l2cu_send_peer_info_req (p_lcb, L2CAP_FIXED_CHANNELS_INFO_TYPE);
708 l2cu_process_fixed_chnl_resp (p_lcb);
713 #if (L2CAP_NUM_FIXED_CHNLS > 0)
714 if (info_type == L2CAP_FIXED_CHANNELS_INFO_TYPE)
716 if (result == L2CAP_INFO_RESP_RESULT_SUCCESS)
718 memcpy (p_lcb->peer_chnl_mask, p, L2CAP_FIXED_CHNL_ARRAY_SIZE);
721 l2cu_process_fixed_chnl_resp (p_lcb);
724 #if (L2CAP_UCD_INCLUDED == TRUE)
725 else if (info_type == L2CAP_CONNLESS_MTU_INFO_TYPE)
727 if (result == L2CAP_INFO_RESP_RESULT_SUCCESS)
729 STREAM_TO_UINT16 (p_lcb->ucd_mtu, p);
734 ci.status = HCI_SUCCESS;
735 memcpy (ci.bd_addr, p_lcb->remote_bd_addr, sizeof(BD_ADDR));
736 for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb)
738 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_INFO_RSP, &ci);
743 L2CAP_TRACE_WARNING ("L2CAP - bad cmd code: %d", cmd_code);
744 l2cu_send_peer_cmd_reject (p_lcb, L2CAP_CMD_REJ_NOT_UNDERSTOOD, id, 0, 0);
750 /*******************************************************************************
752 ** Function l2c_process_held_packets
754 ** Description This function processes any L2CAP packets that arrived before
755 ** the HCI connection complete arrived. It is a work around for
756 ** badly behaved controllers.
760 *******************************************************************************/
761 void l2c_process_held_packets(BOOLEAN timed_out) {
762 if (list_is_empty(l2cb.rcv_pending_q))
766 alarm_cancel(l2cb.receive_hold_timer);
767 L2CAP_TRACE_WARNING("L2CAP HOLD CONTINUE");
769 L2CAP_TRACE_WARNING("L2CAP HOLD TIMEOUT");
772 for (const list_node_t *node = list_begin(l2cb.rcv_pending_q);
773 node != list_end(l2cb.rcv_pending_q);) {
774 BT_HDR *p_buf = list_node(node);
775 node = list_next(node);
776 if (!timed_out || (!p_buf->layer_specific) || (--p_buf->layer_specific == 0)) {
777 list_remove(l2cb.rcv_pending_q, p_buf);
778 p_buf->layer_specific = 0xFFFF;
779 l2c_rcv_acl_data(p_buf);
783 /* If anyone still in the queue, restart the timeout */
784 if (!list_is_empty(l2cb.rcv_pending_q)) {
785 alarm_set_on_queue(l2cb.receive_hold_timer, BT_1SEC_TIMEOUT_MS,
786 l2c_receive_hold_timer_timeout, NULL,
787 btu_general_alarm_queue);
791 /*******************************************************************************
795 ** Description This function is called once at startup to initialize
796 ** all the L2CAP structures
800 *******************************************************************************/
805 memset (&l2cb, 0, sizeof (tL2C_CB));
806 /* the psm is increased by 2 before being used */
807 l2cb.dyn_psm = 0xFFF;
809 /* Put all the channel control blocks on the free queue */
810 for (xx = 0; xx < MAX_L2CAP_CHANNELS - 1; xx++)
812 l2cb.ccb_pool[xx].p_next_ccb = &l2cb.ccb_pool[xx + 1];
815 #if (L2CAP_NON_FLUSHABLE_PB_INCLUDED == TRUE)
816 /* it will be set to L2CAP_PKT_START_NON_FLUSHABLE if controller supports */
817 l2cb.non_flushable_pbf = L2CAP_PKT_START << L2CAP_PKT_TYPE_SHIFT;
820 l2cb.p_free_ccb_first = &l2cb.ccb_pool[0];
821 l2cb.p_free_ccb_last = &l2cb.ccb_pool[MAX_L2CAP_CHANNELS - 1];
823 #ifdef L2CAP_DESIRED_LINK_ROLE
824 l2cb.desire_role = L2CAP_DESIRED_LINK_ROLE;
826 l2cb.desire_role = HCI_ROLE_SLAVE;
829 /* Set the default idle timeout */
830 l2cb.idle_timeout = L2CAP_LINK_INACTIVITY_TOUT;
832 #if defined(L2CAP_INITIAL_TRACE_LEVEL)
833 l2cb.l2cap_trace_level = L2CAP_INITIAL_TRACE_LEVEL;
835 l2cb.l2cap_trace_level = BT_TRACE_LEVEL_NONE; /* No traces */
838 #if L2CAP_CONFORMANCE_TESTING == TRUE
839 /* Conformance testing needs a dynamic response */
840 l2cb.test_info_resp = L2CAP_EXTFEA_SUPPORTED_MASK;
843 /* Number of ACL buffers to use for high priority channel */
844 #if (defined(L2CAP_HIGH_PRI_CHAN_QUOTA_IS_CONFIGURABLE) && (L2CAP_HIGH_PRI_CHAN_QUOTA_IS_CONFIGURABLE == TRUE))
845 l2cb.high_pri_min_xmit_quota = L2CAP_HIGH_PRI_MIN_XMIT_QUOTA;
848 #if BLE_INCLUDED == TRUE
849 l2cb.l2c_ble_fixed_chnls_mask =
850 L2CAP_FIXED_CHNL_ATT_BIT | L2CAP_FIXED_CHNL_BLE_SIG_BIT | L2CAP_FIXED_CHNL_SMP_BIT;
853 l2cb.rcv_pending_q = list_new(NULL);
854 if (l2cb.rcv_pending_q == NULL)
855 LOG_ERROR(LOG_TAG, "%s unable to allocate memory for link layer control block", __func__);
856 l2cb.receive_hold_timer = alarm_new("l2c.receive_hold_timer");
859 void l2c_free(void) {
860 list_free(l2cb.rcv_pending_q);
863 void l2c_receive_hold_timer_timeout(UNUSED_ATTR void *data)
865 /* Update the timeouts in the hold queue */
866 l2c_process_held_packets(TRUE);
869 void l2c_ccb_timer_timeout(void *data)
871 tL2C_CCB *p_ccb = (tL2C_CCB *)data;
873 l2c_csm_execute(p_ccb, L2CEVT_TIMEOUT, NULL);
876 void l2c_fcrb_ack_timer_timeout(void *data)
878 tL2C_CCB *p_ccb = (tL2C_CCB *)data;
880 l2c_csm_execute(p_ccb, L2CEVT_ACK_TIMEOUT, NULL);
883 void l2c_lcb_timer_timeout(void *data)
885 tL2C_LCB *p_lcb = (tL2C_LCB *)data;
887 l2c_link_timeout(p_lcb);
890 /*******************************************************************************
892 ** Function l2c_data_write
894 ** Description API functions call this function to write data.
896 ** Returns L2CAP_DW_SUCCESS, if data accepted, else FALSE
897 ** L2CAP_DW_CONGESTED, if data accepted and the channel is congested
898 ** L2CAP_DW_FAILED, if error
900 *******************************************************************************/
901 UINT8 l2c_data_write (UINT16 cid, BT_HDR *p_data, UINT16 flags)
905 /* Find the channel control block. We don't know the link it is on. */
906 if ((p_ccb = l2cu_find_ccb_by_cid (NULL, cid)) == NULL)
908 L2CAP_TRACE_WARNING ("L2CAP - no CCB for L2CA_DataWrite, CID: %d", cid);
910 return (L2CAP_DW_FAILED);
913 #ifndef TESTER /* Tester may send any amount of data. otherwise sending message
914 bigger than mtu size of peer is a violation of protocol */
917 if (p_ccb->p_lcb->transport == BT_TRANSPORT_LE)
918 mtu = p_ccb->peer_conn_cfg.mtu;
920 mtu = p_ccb->peer_cfg.mtu;
922 if (p_data->len > mtu)
924 L2CAP_TRACE_WARNING ("L2CAP - CID: 0x%04x cannot send message bigger than peer's mtu size", cid);
926 return (L2CAP_DW_FAILED);
930 /* channel based, packet based flushable or non-flushable */
931 p_data->layer_specific = flags;
933 /* If already congested, do not accept any more packets */
934 if (p_ccb->cong_sent)
936 L2CAP_TRACE_ERROR ("L2CAP - CID: 0x%04x cannot send, already congested xmit_hold_q.count: %u buff_quota: %u",
938 fixed_queue_length(p_ccb->xmit_hold_q),
942 return (L2CAP_DW_FAILED);
946 l2c_csm_execute (p_ccb, L2CEVT_L2CA_DATA_WRITE, p_data);
948 if (p_ccb->cong_sent)
949 return (L2CAP_DW_CONGESTED);
951 return (L2CAP_DW_SUCCESS);