/******************************************************************************
*
* Copyright (C) 1999-2012 Broadcom Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
/******************************************************************************
*
* This file contains the main L2CAP entry points
*
******************************************************************************/
#define LOG_TAG "bt_l2c_main"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "bt_common.h"
#include "bt_target.h"
#include "btm_int.h"
#include "btu.h"
#include "device/include/controller.h"
#include "hcimsgs.h"
#include "l2c_api.h"
#include "l2c_int.h"
#include "l2cdefs.h"
#include "osi/include/log.h"
#include "osi/include/osi.h"
extern fixed_queue_t* btu_general_alarm_queue;
/******************************************************************************/
/* L O C A L F U N C T I O N P R O T O T Y P E S */
/******************************************************************************/
static void process_l2cap_cmd(tL2C_LCB* p_lcb, uint8_t* p, uint16_t pkt_len);
/******************************************************************************/
/* G L O B A L L 2 C A P D A T A */
/******************************************************************************/
tL2C_CB l2cb;
/*******************************************************************************
*
* Function l2c_rcv_acl_data
*
* Description This function is called from the HCI Interface when an ACL
* data packet is received.
*
* Returns void
*
******************************************************************************/
void l2c_rcv_acl_data(BT_HDR* p_msg) {
uint8_t* p = (uint8_t*)(p_msg + 1) + p_msg->offset;
uint16_t handle, hci_len;
uint8_t pkt_type;
tL2C_LCB* p_lcb;
tL2C_CCB* p_ccb = NULL;
uint16_t l2cap_len, rcv_cid, psm;
uint16_t credit;
/* Extract the handle */
STREAM_TO_UINT16(handle, p);
pkt_type = HCID_GET_EVENT(handle);
handle = HCID_GET_HANDLE(handle);
/* Since the HCI Transport is putting segmented packets back together, we */
/* should never get a valid packet with the type set to "continuation" */
if (pkt_type != L2CAP_PKT_CONTINUE) {
/* Find the LCB based on the handle */
p_lcb = l2cu_find_lcb_by_handle(handle);
if (p_lcb == NULL) {
uint8_t cmd_code;
/* There is a slight possibility (specifically with USB) that we get an */
/* L2CAP connection request before we get the HCI connection complete. */
/* So for these types of messages, hold them for up to 2 seconds. */
STREAM_TO_UINT16(hci_len, p);
STREAM_TO_UINT16(l2cap_len, p);
STREAM_TO_UINT16(rcv_cid, p);
STREAM_TO_UINT8(cmd_code, p);
if ((p_msg->layer_specific == 0) && (rcv_cid == L2CAP_SIGNALLING_CID) &&
(cmd_code == L2CAP_CMD_INFO_REQ || cmd_code == L2CAP_CMD_CONN_REQ)) {
L2CAP_TRACE_WARNING(
"L2CAP - holding ACL for unknown handle:%d ls:%d"
" cid:%d opcode:%d cur count:%d",
handle, p_msg->layer_specific, rcv_cid, cmd_code,
list_length(l2cb.rcv_pending_q));
p_msg->layer_specific = 2;
list_append(l2cb.rcv_pending_q, p_msg);
if (list_length(l2cb.rcv_pending_q) == 1) {
alarm_set_on_queue(l2cb.receive_hold_timer, BT_1SEC_TIMEOUT_MS,
l2c_receive_hold_timer_timeout, NULL,
btu_general_alarm_queue);
}
return;
} else {
L2CAP_TRACE_ERROR(
"L2CAP - rcvd ACL for unknown handle:%d ls:%d cid:%d"
" opcode:%d cur count:%d",
handle, p_msg->layer_specific, rcv_cid, cmd_code,
list_length(l2cb.rcv_pending_q));
}
osi_free(p_msg);
return;
}
} else {
L2CAP_TRACE_WARNING("L2CAP - expected pkt start or complete, got: %d",
pkt_type);
osi_free(p_msg);
return;
}
/* Extract the length and update the buffer header */
STREAM_TO_UINT16(hci_len, p);
p_msg->offset += 4;
if (hci_len < L2CAP_PKT_OVERHEAD) {
/* Must receive at least the L2CAP length and CID */
L2CAP_TRACE_WARNING("L2CAP - got incorrect hci header");
osi_free(p_msg);
return;
}
/* Extract the length and CID */
STREAM_TO_UINT16(l2cap_len, p);
STREAM_TO_UINT16(rcv_cid, p);
/* for BLE channel, always notify connection when ACL data received on the
* link */
if (p_lcb && p_lcb->transport == BT_TRANSPORT_LE &&
p_lcb->link_state != LST_DISCONNECTING)
/* only process fixed channel data as channel open indication when link is
* not in disconnecting mode */
l2cble_notify_le_connection(p_lcb->remote_bd_addr);
/* Find the CCB for this CID */
if (rcv_cid >= L2CAP_BASE_APPL_CID) {
p_ccb = l2cu_find_ccb_by_cid(p_lcb, rcv_cid);
if (p_ccb == NULL) {
L2CAP_TRACE_WARNING("L2CAP - unknown CID: 0x%04x", rcv_cid);
osi_free(p_msg);
return;
}
}
p_msg->len = hci_len - L2CAP_PKT_OVERHEAD;
p_msg->offset += L2CAP_PKT_OVERHEAD;
if (l2cap_len != p_msg->len) {
L2CAP_TRACE_WARNING("L2CAP - bad length in pkt. Exp: %d Act: %d",
l2cap_len, p_msg->len);
osi_free(p_msg);
return;
}
/* Send the data through the channel state machine */
if (rcv_cid == L2CAP_SIGNALLING_CID) {
process_l2cap_cmd(p_lcb, p, l2cap_len);
osi_free(p_msg);
} else if (rcv_cid == L2CAP_CONNECTIONLESS_CID) {
/* process_connectionless_data (p_lcb); */
STREAM_TO_UINT16(psm, p);
L2CAP_TRACE_DEBUG("GOT CONNECTIONLESS DATA PSM:%d", psm);
#if (L2CAP_UCD_INCLUDED == TRUE)
/* if it is not broadcast, check UCD registration */
if (l2c_ucd_check_rx_pkts(p_lcb, p_msg)) {
/* nothing to do */
} else
#endif
osi_free(p_msg);
} else if (rcv_cid == L2CAP_BLE_SIGNALLING_CID) {
l2cble_process_sig_cmd(p_lcb, p, l2cap_len);
osi_free(p_msg);
}
#if (L2CAP_NUM_FIXED_CHNLS > 0)
else if ((rcv_cid >= L2CAP_FIRST_FIXED_CHNL) &&
(rcv_cid <= L2CAP_LAST_FIXED_CHNL) &&
(l2cb.fixed_reg[rcv_cid - L2CAP_FIRST_FIXED_CHNL]
.pL2CA_FixedData_Cb != NULL)) {
/* If no CCB for this channel, allocate one */
if (p_lcb &&
/* only process fixed channel data when link is open or wait for data
indication */
(p_lcb->link_state != LST_DISCONNECTING) &&
l2cu_initialize_fixed_ccb(
p_lcb, rcv_cid, &l2cb.fixed_reg[rcv_cid - L2CAP_FIRST_FIXED_CHNL]
.fixed_chnl_opts)) {
p_ccb = p_lcb->p_fixed_ccbs[rcv_cid - L2CAP_FIRST_FIXED_CHNL];
if (p_ccb->peer_cfg.fcr.mode != L2CAP_FCR_BASIC_MODE)
l2c_fcr_proc_pdu(p_ccb, p_msg);
else
(*l2cb.fixed_reg[rcv_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb)(
rcv_cid, p_lcb->remote_bd_addr, p_msg);
} else
osi_free(p_msg);
}
#endif
else {
if (p_ccb == NULL)
osi_free(p_msg);
else {
if (p_lcb->transport == BT_TRANSPORT_LE) {
l2c_lcc_proc_pdu(p_ccb, p_msg);
// Got a pkt, valid send out credits to the peer device
credit = L2CAP_LE_DEFAULT_CREDIT;
l2c_csm_execute(p_ccb, L2CEVT_L2CA_SEND_FLOW_CONTROL_CREDIT, &credit);
} else {
/* Basic mode packets go straight to the state machine */
if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_BASIC_MODE)
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_DATA, p_msg);
else {
/* eRTM or streaming mode, so we need to validate states first */
if ((p_ccb->chnl_state == CST_OPEN) ||
(p_ccb->chnl_state == CST_CONFIG))
l2c_fcr_proc_pdu(p_ccb, p_msg);
else
osi_free(p_msg);
}
}
}
}
}
/*******************************************************************************
*
* Function process_l2cap_cmd
*
* Description This function is called when a packet is received on the
* L2CAP signalling CID
*
* Returns void
*
******************************************************************************/
static void process_l2cap_cmd(tL2C_LCB* p_lcb, uint8_t* p, uint16_t pkt_len) {
uint8_t *p_pkt_end, *p_next_cmd, *p_cfg_end, *p_cfg_start;
uint8_t cmd_code, cfg_code, cfg_len, id;
tL2C_CONN_INFO con_info;
tL2CAP_CFG_INFO cfg_info;
uint16_t rej_reason, rej_mtu, lcid, rcid, info_type;
tL2C_CCB* p_ccb;
tL2C_RCB* p_rcb;
bool cfg_rej, pkt_size_rej = false;
uint16_t cfg_rej_len, cmd_len;
uint16_t result;
tL2C_CONN_INFO ci;
/* if l2cap command received in CID 1 on top of an LE link, ignore this
* command */
if (p_lcb->transport == BT_TRANSPORT_LE) return;
/* Reject the packet if it exceeds the default Signalling Channel MTU */
if (pkt_len > L2CAP_DEFAULT_MTU) {
/* Core Spec requires a single response to the first command found in a
*multi-command
** L2cap packet. If only responses in the packet, then it will be ignored.
** Here we simply mark the bad packet and decide which cmd ID to reject
*later
*/
pkt_size_rej = true;
L2CAP_TRACE_ERROR("L2CAP SIG MTU Pkt Len Exceeded (672) -> pkt_len: %d",
pkt_len);
}
p_next_cmd = p;
p_pkt_end = p + pkt_len;
memset(&cfg_info, 0, sizeof(cfg_info));
/* An L2CAP packet may contain multiple commands */
while (true) {
/* Smallest command is 4 bytes */
p = p_next_cmd;
if (p > (p_pkt_end - 4)) break;
STREAM_TO_UINT8(cmd_code, p);
STREAM_TO_UINT8(id, p);
STREAM_TO_UINT16(cmd_len, p);
if (cmd_len > BT_SMALL_BUFFER_SIZE) {
L2CAP_TRACE_WARNING("L2CAP - Invalid MTU Size");
l2cu_send_peer_cmd_reject(p_lcb, L2CAP_CMD_REJ_MTU_EXCEEDED, id, 0, 0);
return;
}
/* Check command length does not exceed packet length */
p_next_cmd = p + cmd_len;
if (p_next_cmd > p_pkt_end) {
L2CAP_TRACE_WARNING("Command len bad pkt_len: %d cmd_len: %d code: %d",
pkt_len, cmd_len, cmd_code);
break;
}
L2CAP_TRACE_DEBUG("cmd_code: %d, id:%d, cmd_len:%d", cmd_code, id, cmd_len);
/* Bad L2CAP packet length, look or cmd to reject */
if (pkt_size_rej) {
/* If command found rejected it and we're done, otherwise keep looking */
if (l2c_is_cmd_rejected(cmd_code, id, p_lcb))
return;
else
continue; /* Look for next cmd/response in current packet */
}
switch (cmd_code) {
case L2CAP_CMD_REJECT:
STREAM_TO_UINT16(rej_reason, p);
if (rej_reason == L2CAP_CMD_REJ_MTU_EXCEEDED) {
STREAM_TO_UINT16(rej_mtu, p);
/* What to do with the MTU reject ? We have negotiated an MTU. For now
*/
/* we will ignore it and let a higher protocol timeout take care of it
*/
L2CAP_TRACE_WARNING("L2CAP - MTU rej Handle: %d MTU: %d",
p_lcb->handle, rej_mtu);
}
if (rej_reason == L2CAP_CMD_REJ_INVALID_CID) {
STREAM_TO_UINT16(rcid, p);
STREAM_TO_UINT16(lcid, p);
L2CAP_TRACE_WARNING(
"L2CAP - rej with CID invalid, LCID: 0x%04x RCID: 0x%04x", lcid,
rcid);
/* Remote CID invalid. Treat as a disconnect */
p_ccb = l2cu_find_ccb_by_cid(p_lcb, lcid);
if ((p_ccb != NULL) && (p_ccb->remote_cid == rcid)) {
/* Fake link disconnect - no reply is generated */
l2c_csm_execute(p_ccb, L2CEVT_LP_DISCONNECT_IND, NULL);
}
}
/* SonyEricsson Info request Bug workaround (Continue connection) */
else if (rej_reason == L2CAP_CMD_REJ_NOT_UNDERSTOOD &&
p_lcb->w4_info_rsp) {
alarm_cancel(p_lcb->info_resp_timer);
p_lcb->w4_info_rsp = false;
ci.status = HCI_SUCCESS;
memcpy(ci.bd_addr, p_lcb->remote_bd_addr, sizeof(BD_ADDR));
/* For all channels, send the event through their FSMs */
for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb;
p_ccb = p_ccb->p_next_ccb) {
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_INFO_RSP, &ci);
}
}
break;
case L2CAP_CMD_CONN_REQ:
STREAM_TO_UINT16(con_info.psm, p);
STREAM_TO_UINT16(rcid, p);
p_rcb = l2cu_find_rcb_by_psm(con_info.psm);
if (p_rcb == NULL) {
L2CAP_TRACE_WARNING("L2CAP - rcvd conn req for unknown PSM: %d",
con_info.psm);
l2cu_reject_connection(p_lcb, rcid, id, L2CAP_CONN_NO_PSM);
break;
} else {
if (!p_rcb->api.pL2CA_ConnectInd_Cb) {
L2CAP_TRACE_WARNING(
"L2CAP - rcvd conn req for outgoing-only connection PSM: %d",
con_info.psm);
l2cu_reject_connection(p_lcb, rcid, id, L2CAP_CONN_NO_PSM);
break;
}
}
p_ccb = l2cu_allocate_ccb(p_lcb, 0);
if (p_ccb == NULL) {
L2CAP_TRACE_ERROR("L2CAP - unable to allocate CCB");
l2cu_reject_connection(p_lcb, rcid, id, L2CAP_CONN_NO_RESOURCES);
break;
}
p_ccb->remote_id = id;
p_ccb->p_rcb = p_rcb;
p_ccb->remote_cid = rcid;
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_REQ, &con_info);
break;
case L2CAP_CMD_CONN_RSP:
STREAM_TO_UINT16(con_info.remote_cid, p);
STREAM_TO_UINT16(lcid, p);
STREAM_TO_UINT16(con_info.l2cap_result, p);
STREAM_TO_UINT16(con_info.l2cap_status, p);
p_ccb = l2cu_find_ccb_by_cid(p_lcb, lcid);
if (p_ccb == NULL) {
L2CAP_TRACE_WARNING("L2CAP - no CCB for conn rsp, LCID: %d RCID: %d",
lcid, con_info.remote_cid);
break;
}
if (p_ccb->local_id != id) {
L2CAP_TRACE_WARNING("L2CAP - con rsp - bad ID. Exp: %d Got: %d",
p_ccb->local_id, id);
break;
}
if (con_info.l2cap_result == L2CAP_CONN_OK)
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP, &con_info);
else if (con_info.l2cap_result == L2CAP_CONN_PENDING)
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP_PND, &con_info);
else
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP_NEG, &con_info);
break;
case L2CAP_CMD_CONFIG_REQ:
p_cfg_end = p + cmd_len;
cfg_rej = false;
cfg_rej_len = 0;
STREAM_TO_UINT16(lcid, p);
STREAM_TO_UINT16(cfg_info.flags, p);
p_cfg_start = p;
cfg_info.flush_to_present = cfg_info.mtu_present =
cfg_info.qos_present = cfg_info.fcr_present = cfg_info.fcs_present =
false;
while (p < p_cfg_end) {
STREAM_TO_UINT8(cfg_code, p);
STREAM_TO_UINT8(cfg_len, p);
switch (cfg_code & 0x7F) {
case L2CAP_CFG_TYPE_MTU:
cfg_info.mtu_present = true;
STREAM_TO_UINT16(cfg_info.mtu, p);
break;
case L2CAP_CFG_TYPE_FLUSH_TOUT:
cfg_info.flush_to_present = true;
STREAM_TO_UINT16(cfg_info.flush_to, p);
break;
case L2CAP_CFG_TYPE_QOS:
cfg_info.qos_present = true;
STREAM_TO_UINT8(cfg_info.qos.qos_flags, p);
STREAM_TO_UINT8(cfg_info.qos.service_type, p);
STREAM_TO_UINT32(cfg_info.qos.token_rate, p);
STREAM_TO_UINT32(cfg_info.qos.token_bucket_size, p);
STREAM_TO_UINT32(cfg_info.qos.peak_bandwidth, p);
STREAM_TO_UINT32(cfg_info.qos.latency, p);
STREAM_TO_UINT32(cfg_info.qos.delay_variation, p);
break;
case L2CAP_CFG_TYPE_FCR:
cfg_info.fcr_present = true;
STREAM_TO_UINT8(cfg_info.fcr.mode, p);
STREAM_TO_UINT8(cfg_info.fcr.tx_win_sz, p);
STREAM_TO_UINT8(cfg_info.fcr.max_transmit, p);
STREAM_TO_UINT16(cfg_info.fcr.rtrans_tout, p);
STREAM_TO_UINT16(cfg_info.fcr.mon_tout, p);
STREAM_TO_UINT16(cfg_info.fcr.mps, p);
break;
case L2CAP_CFG_TYPE_FCS:
cfg_info.fcs_present = true;
STREAM_TO_UINT8(cfg_info.fcs, p);
break;
case L2CAP_CFG_TYPE_EXT_FLOW:
cfg_info.ext_flow_spec_present = true;
STREAM_TO_UINT8(cfg_info.ext_flow_spec.id, p);
STREAM_TO_UINT8(cfg_info.ext_flow_spec.stype, p);
STREAM_TO_UINT16(cfg_info.ext_flow_spec.max_sdu_size, p);
STREAM_TO_UINT32(cfg_info.ext_flow_spec.sdu_inter_time, p);
STREAM_TO_UINT32(cfg_info.ext_flow_spec.access_latency, p);
STREAM_TO_UINT32(cfg_info.ext_flow_spec.flush_timeout, p);
break;
default:
/* sanity check option length */
if ((cfg_len + L2CAP_CFG_OPTION_OVERHEAD) <= cmd_len) {
p += cfg_len;
if ((cfg_code & 0x80) == 0) {
cfg_rej_len += cfg_len + L2CAP_CFG_OPTION_OVERHEAD;
cfg_rej = true;
}
}
/* bad length; force loop exit */
else {
p = p_cfg_end;
cfg_rej = true;
}
break;
}
}
p_ccb = l2cu_find_ccb_by_cid(p_lcb, lcid);
if (p_ccb != NULL) {
p_ccb->remote_id = id;
if (cfg_rej) {
l2cu_send_peer_config_rej(
p_ccb, p_cfg_start, (uint16_t)(cmd_len - L2CAP_CONFIG_REQ_LEN),
cfg_rej_len);
} else {
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONFIG_REQ, &cfg_info);
}
} else {
/* updated spec says send command reject on invalid cid */
l2cu_send_peer_cmd_reject(p_lcb, L2CAP_CMD_REJ_INVALID_CID, id, 0, 0);
}
break;
case L2CAP_CMD_CONFIG_RSP:
p_cfg_end = p + cmd_len;
STREAM_TO_UINT16(lcid, p);
STREAM_TO_UINT16(cfg_info.flags, p);
STREAM_TO_UINT16(cfg_info.result, p);
cfg_info.flush_to_present = cfg_info.mtu_present =
cfg_info.qos_present = cfg_info.fcr_present = cfg_info.fcs_present =
false;
while (p < p_cfg_end) {
STREAM_TO_UINT8(cfg_code, p);
STREAM_TO_UINT8(cfg_len, p);
switch (cfg_code & 0x7F) {
case L2CAP_CFG_TYPE_MTU:
cfg_info.mtu_present = true;
STREAM_TO_UINT16(cfg_info.mtu, p);
break;
case L2CAP_CFG_TYPE_FLUSH_TOUT:
cfg_info.flush_to_present = true;
STREAM_TO_UINT16(cfg_info.flush_to, p);
break;
case L2CAP_CFG_TYPE_QOS:
cfg_info.qos_present = true;
STREAM_TO_UINT8(cfg_info.qos.qos_flags, p);
STREAM_TO_UINT8(cfg_info.qos.service_type, p);
STREAM_TO_UINT32(cfg_info.qos.token_rate, p);
STREAM_TO_UINT32(cfg_info.qos.token_bucket_size, p);
STREAM_TO_UINT32(cfg_info.qos.peak_bandwidth, p);
STREAM_TO_UINT32(cfg_info.qos.latency, p);
STREAM_TO_UINT32(cfg_info.qos.delay_variation, p);
break;
case L2CAP_CFG_TYPE_FCR:
cfg_info.fcr_present = true;
STREAM_TO_UINT8(cfg_info.fcr.mode, p);
STREAM_TO_UINT8(cfg_info.fcr.tx_win_sz, p);
STREAM_TO_UINT8(cfg_info.fcr.max_transmit, p);
STREAM_TO_UINT16(cfg_info.fcr.rtrans_tout, p);
STREAM_TO_UINT16(cfg_info.fcr.mon_tout, p);
STREAM_TO_UINT16(cfg_info.fcr.mps, p);
break;
case L2CAP_CFG_TYPE_FCS:
cfg_info.fcs_present = true;
STREAM_TO_UINT8(cfg_info.fcs, p);
break;
case L2CAP_CFG_TYPE_EXT_FLOW:
cfg_info.ext_flow_spec_present = true;
STREAM_TO_UINT8(cfg_info.ext_flow_spec.id, p);
STREAM_TO_UINT8(cfg_info.ext_flow_spec.stype, p);
STREAM_TO_UINT16(cfg_info.ext_flow_spec.max_sdu_size, p);
STREAM_TO_UINT32(cfg_info.ext_flow_spec.sdu_inter_time, p);
STREAM_TO_UINT32(cfg_info.ext_flow_spec.access_latency, p);
STREAM_TO_UINT32(cfg_info.ext_flow_spec.flush_timeout, p);
break;
}
}
p_ccb = l2cu_find_ccb_by_cid(p_lcb, lcid);
if (p_ccb != NULL) {
if (p_ccb->local_id != id) {
L2CAP_TRACE_WARNING("L2CAP - cfg rsp - bad ID. Exp: %d Got: %d",
p_ccb->local_id, id);
break;
}
if ((cfg_info.result == L2CAP_CFG_OK) ||
(cfg_info.result == L2CAP_CFG_PENDING))
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONFIG_RSP, &cfg_info);
else
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONFIG_RSP_NEG, &cfg_info);
} else {
L2CAP_TRACE_WARNING("L2CAP - rcvd cfg rsp for unknown CID: 0x%04x",
lcid);
}
break;
case L2CAP_CMD_DISC_REQ:
STREAM_TO_UINT16(lcid, p);
STREAM_TO_UINT16(rcid, p);
p_ccb = l2cu_find_ccb_by_cid(p_lcb, lcid);
if (p_ccb != NULL) {
if (p_ccb->remote_cid == rcid) {
p_ccb->remote_id = id;
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_DISCONNECT_REQ, &con_info);
}
} else
l2cu_send_peer_disc_rsp(p_lcb, id, lcid, rcid);
break;
case L2CAP_CMD_DISC_RSP:
STREAM_TO_UINT16(rcid, p);
STREAM_TO_UINT16(lcid, p);
p_ccb = l2cu_find_ccb_by_cid(p_lcb, lcid);
if (p_ccb != NULL) {
if ((p_ccb->remote_cid == rcid) && (p_ccb->local_id == id)) {
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_DISCONNECT_RSP, &con_info);
}
}
break;
case L2CAP_CMD_ECHO_REQ:
l2cu_send_peer_echo_rsp(p_lcb, id, p, cmd_len);
break;
case L2CAP_CMD_ECHO_RSP:
if (p_lcb->p_echo_rsp_cb) {
tL2CA_ECHO_RSP_CB* p_cb = p_lcb->p_echo_rsp_cb;
/* Zero out the callback in case app immediately calls us again */
p_lcb->p_echo_rsp_cb = NULL;
(*p_cb)(L2CAP_PING_RESULT_OK);
}
break;
case L2CAP_CMD_INFO_REQ:
STREAM_TO_UINT16(info_type, p);
l2cu_send_peer_info_rsp(p_lcb, id, info_type);
break;
case L2CAP_CMD_INFO_RSP:
/* Stop the link connect timer if sent before L2CAP connection is up */
if (p_lcb->w4_info_rsp) {
alarm_cancel(p_lcb->info_resp_timer);
p_lcb->w4_info_rsp = false;
}
STREAM_TO_UINT16(info_type, p);
STREAM_TO_UINT16(result, p);
p_lcb->info_rx_bits |= (1 << info_type);
if ((info_type == L2CAP_EXTENDED_FEATURES_INFO_TYPE) &&
(result == L2CAP_INFO_RESP_RESULT_SUCCESS)) {
STREAM_TO_UINT32(p_lcb->peer_ext_fea, p);
#if (L2CAP_NUM_FIXED_CHNLS > 0)
if (p_lcb->peer_ext_fea & L2CAP_EXTFEA_FIXED_CHNLS) {
l2cu_send_peer_info_req(p_lcb, L2CAP_FIXED_CHANNELS_INFO_TYPE);
break;
} else {
l2cu_process_fixed_chnl_resp(p_lcb);
}
#endif
}
#if (L2CAP_NUM_FIXED_CHNLS > 0)
if (info_type == L2CAP_FIXED_CHANNELS_INFO_TYPE) {
if (result == L2CAP_INFO_RESP_RESULT_SUCCESS) {
memcpy(p_lcb->peer_chnl_mask, p, L2CAP_FIXED_CHNL_ARRAY_SIZE);
}
l2cu_process_fixed_chnl_resp(p_lcb);
}
#endif
#if (L2CAP_UCD_INCLUDED == TRUE)
else if (info_type == L2CAP_CONNLESS_MTU_INFO_TYPE) {
if (result == L2CAP_INFO_RESP_RESULT_SUCCESS) {
STREAM_TO_UINT16(p_lcb->ucd_mtu, p);
}
}
#endif
ci.status = HCI_SUCCESS;
memcpy(ci.bd_addr, p_lcb->remote_bd_addr, sizeof(BD_ADDR));
for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb;
p_ccb = p_ccb->p_next_ccb) {
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_INFO_RSP, &ci);
}
break;
default:
L2CAP_TRACE_WARNING("L2CAP - bad cmd code: %d", cmd_code);
l2cu_send_peer_cmd_reject(p_lcb, L2CAP_CMD_REJ_NOT_UNDERSTOOD, id, 0,
0);
return;
}
}
}
/*******************************************************************************
*
* Function l2c_process_held_packets
*
* Description This function processes any L2CAP packets that arrived
* before the HCI connection complete arrived. It is a work
* around for badly behaved controllers.
*
* Returns void
*
******************************************************************************/
void l2c_process_held_packets(bool timed_out) {
if (list_is_empty(l2cb.rcv_pending_q)) return;
if (!timed_out) {
alarm_cancel(l2cb.receive_hold_timer);
L2CAP_TRACE_WARNING("L2CAP HOLD CONTINUE");
} else {
L2CAP_TRACE_WARNING("L2CAP HOLD TIMEOUT");
}
for (const list_node_t* node = list_begin(l2cb.rcv_pending_q);
node != list_end(l2cb.rcv_pending_q);) {
BT_HDR* p_buf = static_cast<BT_HDR*>(list_node(node));
node = list_next(node);
if (!timed_out || (!p_buf->layer_specific) ||
(--p_buf->layer_specific == 0)) {
list_remove(l2cb.rcv_pending_q, p_buf);
p_buf->layer_specific = 0xFFFF;
l2c_rcv_acl_data(p_buf);
}
}
/* If anyone still in the queue, restart the timeout */
if (!list_is_empty(l2cb.rcv_pending_q)) {
alarm_set_on_queue(l2cb.receive_hold_timer, BT_1SEC_TIMEOUT_MS,
l2c_receive_hold_timer_timeout, NULL,
btu_general_alarm_queue);
}
}
/*******************************************************************************
*
* Function l2c_init
*
* Description This function is called once at startup to initialize
* all the L2CAP structures
*
* Returns void
*
******************************************************************************/
void l2c_init(void) {
int16_t xx;
memset(&l2cb, 0, sizeof(tL2C_CB));
/* the psm is increased by 2 before being used */
l2cb.dyn_psm = 0xFFF;
/* Put all the channel control blocks on the free queue */
for (xx = 0; xx < MAX_L2CAP_CHANNELS - 1; xx++) {
l2cb.ccb_pool[xx].p_next_ccb = &l2cb.ccb_pool[xx + 1];
}
#if (L2CAP_NON_FLUSHABLE_PB_INCLUDED == TRUE)
/* it will be set to L2CAP_PKT_START_NON_FLUSHABLE if controller supports */
l2cb.non_flushable_pbf = L2CAP_PKT_START << L2CAP_PKT_TYPE_SHIFT;
#endif
l2cb.p_free_ccb_first = &l2cb.ccb_pool[0];
l2cb.p_free_ccb_last = &l2cb.ccb_pool[MAX_L2CAP_CHANNELS - 1];
#ifdef L2CAP_DESIRED_LINK_ROLE
l2cb.desire_role = L2CAP_DESIRED_LINK_ROLE;
#else
l2cb.desire_role = HCI_ROLE_SLAVE;
#endif
/* Set the default idle timeout */
l2cb.idle_timeout = L2CAP_LINK_INACTIVITY_TOUT;
#if defined(L2CAP_INITIAL_TRACE_LEVEL)
l2cb.l2cap_trace_level = L2CAP_INITIAL_TRACE_LEVEL;
#else
l2cb.l2cap_trace_level = BT_TRACE_LEVEL_NONE; /* No traces */
#endif
#if (L2CAP_CONFORMANCE_TESTING == TRUE)
/* Conformance testing needs a dynamic response */
l2cb.test_info_resp = L2CAP_EXTFEA_SUPPORTED_MASK;
#endif
/* Number of ACL buffers to use for high priority channel */
#if (L2CAP_HIGH_PRI_CHAN_QUOTA_IS_CONFIGURABLE == TRUE)
l2cb.high_pri_min_xmit_quota = L2CAP_HIGH_PRI_MIN_XMIT_QUOTA;
#endif
l2cb.l2c_ble_fixed_chnls_mask = L2CAP_FIXED_CHNL_ATT_BIT |
L2CAP_FIXED_CHNL_BLE_SIG_BIT |
L2CAP_FIXED_CHNL_SMP_BIT;
l2cb.rcv_pending_q = list_new(NULL);
CHECK(l2cb.rcv_pending_q != NULL);
l2cb.receive_hold_timer = alarm_new("l2c.receive_hold_timer");
}
void l2c_free(void) {
list_free(l2cb.rcv_pending_q);
l2cb.rcv_pending_q = NULL;
}
void l2c_receive_hold_timer_timeout(UNUSED_ATTR void* data) {
/* Update the timeouts in the hold queue */
l2c_process_held_packets(true);
}
void l2c_ccb_timer_timeout(void* data) {
tL2C_CCB* p_ccb = (tL2C_CCB*)data;
l2c_csm_execute(p_ccb, L2CEVT_TIMEOUT, NULL);
}
void l2c_fcrb_ack_timer_timeout(void* data) {
tL2C_CCB* p_ccb = (tL2C_CCB*)data;
l2c_csm_execute(p_ccb, L2CEVT_ACK_TIMEOUT, NULL);
}
void l2c_lcb_timer_timeout(void* data) {
tL2C_LCB* p_lcb = (tL2C_LCB*)data;
l2c_link_timeout(p_lcb);
}
/*******************************************************************************
*
* Function l2c_data_write
*
* Description API functions call this function to write data.
*
* Returns L2CAP_DW_SUCCESS, if data accepted, else false
* L2CAP_DW_CONGESTED, if data accepted and the channel is
* congested
* L2CAP_DW_FAILED, if error
*
******************************************************************************/
uint8_t l2c_data_write(uint16_t cid, BT_HDR* p_data, uint16_t flags) {
tL2C_CCB* p_ccb;
/* Find the channel control block. We don't know the link it is on. */
p_ccb = l2cu_find_ccb_by_cid(NULL, cid);
if (p_ccb == NULL) {
L2CAP_TRACE_WARNING("L2CAP - no CCB for L2CA_DataWrite, CID: %d", cid);
osi_free(p_data);
return (L2CAP_DW_FAILED);
}
#ifndef TESTER /* Tester may send any amount of data. otherwise sending \
message \
bigger than mtu size of peer is a violation of protocol */
uint16_t mtu;
if (p_ccb->p_lcb->transport == BT_TRANSPORT_LE)
mtu = p_ccb->peer_conn_cfg.mtu;
else
mtu = p_ccb->peer_cfg.mtu;
if (p_data->len > mtu) {
L2CAP_TRACE_WARNING(
"L2CAP - CID: 0x%04x cannot send message bigger than peer's mtu size: "
"len=%u mtu=%u",
cid, p_data->len, mtu);
osi_free(p_data);
return (L2CAP_DW_FAILED);
}
#endif
/* channel based, packet based flushable or non-flushable */
p_data->layer_specific = flags;
/* If already congested, do not accept any more packets */
if (p_ccb->cong_sent) {
L2CAP_TRACE_ERROR(
"L2CAP - CID: 0x%04x cannot send, already congested "
"xmit_hold_q.count: %u buff_quota: %u",
p_ccb->local_cid, fixed_queue_length(p_ccb->xmit_hold_q),
p_ccb->buff_quota);
osi_free(p_data);
return (L2CAP_DW_FAILED);
}
l2c_csm_execute(p_ccb, L2CEVT_L2CA_DATA_WRITE, p_data);
if (p_ccb->cong_sent) return (L2CAP_DW_CONGESTED);
return (L2CAP_DW_SUCCESS);
}