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v811_spc009/system/bt/stack/l2cap/l2c_csm.cc

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/******************************************************************************
*
* Copyright 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 L2CAP channel state machine
*
******************************************************************************/
#define LOG_TAG "l2c_csm"
#include <string>
#include "bt_common.h"
#include "bt_target.h"
#include "common/time_util.h"
#include "hcidefs.h"
#include "l2c_int.h"
#include "l2cdefs.h"
#include "osi/include/log.h"
#include "stack/btm/btm_sec.h"
#include "stack/include/acl_api.h"
/******************************************************************************/
/* 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 l2c_csm_closed(tL2C_CCB* p_ccb, tL2CEVT event, void* p_data);
static void l2c_csm_orig_w4_sec_comp(tL2C_CCB* p_ccb, tL2CEVT event,
void* p_data);
static void l2c_csm_term_w4_sec_comp(tL2C_CCB* p_ccb, tL2CEVT event,
void* p_data);
static void l2c_csm_w4_l2cap_connect_rsp(tL2C_CCB* p_ccb, tL2CEVT event,
void* p_data);
static void l2c_csm_w4_l2ca_connect_rsp(tL2C_CCB* p_ccb, tL2CEVT event,
void* p_data);
static void l2c_csm_config(tL2C_CCB* p_ccb, tL2CEVT event, void* p_data);
static void l2c_csm_open(tL2C_CCB* p_ccb, tL2CEVT event, void* p_data);
static void l2c_csm_w4_l2cap_disconnect_rsp(tL2C_CCB* p_ccb, tL2CEVT event,
void* p_data);
static void l2c_csm_w4_l2ca_disconnect_rsp(tL2C_CCB* p_ccb, tL2CEVT event,
void* p_data);
static const char* l2c_csm_get_event_name(tL2CEVT event);
// Send a connect response with result OK and adjust the state machine
static void l2c_csm_send_connect_rsp(tL2C_CCB* p_ccb) {
l2c_csm_execute(p_ccb, L2CEVT_L2CA_CONNECT_RSP, NULL);
}
// Send a config request and adjust the state machine
static void l2c_csm_send_config_req(tL2C_CCB* p_ccb) {
tL2CAP_CFG_INFO config{};
config.mtu_present = true;
config.mtu = p_ccb->p_rcb->my_mtu;
p_ccb->max_rx_mtu = config.mtu;
if (p_ccb->p_rcb->ertm_info.preferred_mode != L2CAP_FCR_BASIC_MODE) {
config.fcr_present = true;
config.fcr = kDefaultErtmOptions;
}
p_ccb->our_cfg = config;
l2c_csm_execute(p_ccb, L2CEVT_L2CA_CONFIG_REQ, &config);
}
// Send a config response with result OK and adjust the state machine
static void l2c_csm_send_config_rsp_ok(tL2C_CCB* p_ccb) {
tL2CAP_CFG_INFO config{};
config.result = L2CAP_CFG_OK;
l2c_csm_execute(p_ccb, L2CEVT_L2CA_CONFIG_RSP, &config);
}
static void l2c_csm_send_disconnect_rsp(tL2C_CCB* p_ccb) {
l2c_csm_execute(p_ccb, L2CEVT_L2CA_DISCONNECT_RSP, NULL);
}
static void l2c_csm_indicate_connection_open(tL2C_CCB* p_ccb) {
if (p_ccb->connection_initiator == L2CAP_INITIATOR_LOCAL) {
(*p_ccb->p_rcb->api.pL2CA_ConnectCfm_Cb)(p_ccb->local_cid, L2CAP_CONN_OK);
} else {
(*p_ccb->p_rcb->api.pL2CA_ConnectInd_Cb)(
p_ccb->p_lcb->remote_bd_addr, p_ccb->local_cid, p_ccb->p_rcb->psm,
p_ccb->remote_id);
}
if (p_ccb->chnl_state == CST_OPEN && !p_ccb->p_lcb->is_transport_ble()) {
(*p_ccb->p_rcb->api.pL2CA_ConfigCfm_Cb)(
p_ccb->local_cid, p_ccb->connection_initiator, &p_ccb->peer_cfg);
}
}
/*******************************************************************************
*
* Function l2c_csm_execute
*
* Description This function executes the state machine.
*
* Returns void
*
******************************************************************************/
void l2c_csm_execute(tL2C_CCB* p_ccb, tL2CEVT event, void* p_data) {
if (!l2cu_is_ccb_active(p_ccb)) {
LOG_WARN("CCB not in use, event (%d) cannot be processed", event);
return;
}
LOG_DEBUG("Entry chnl_state=%s [%d], event=%s [%d]",
channel_state_text(p_ccb->chnl_state).c_str(), p_ccb->chnl_state,
l2c_csm_get_event_name(event), event);
switch (p_ccb->chnl_state) {
case CST_CLOSED:
l2c_csm_closed(p_ccb, event, p_data);
break;
case CST_ORIG_W4_SEC_COMP:
l2c_csm_orig_w4_sec_comp(p_ccb, event, p_data);
break;
case CST_TERM_W4_SEC_COMP:
l2c_csm_term_w4_sec_comp(p_ccb, event, p_data);
break;
case CST_W4_L2CAP_CONNECT_RSP:
l2c_csm_w4_l2cap_connect_rsp(p_ccb, event, p_data);
break;
case CST_W4_L2CA_CONNECT_RSP:
l2c_csm_w4_l2ca_connect_rsp(p_ccb, event, p_data);
break;
case CST_CONFIG:
l2c_csm_config(p_ccb, event, p_data);
break;
case CST_OPEN:
l2c_csm_open(p_ccb, event, p_data);
break;
case CST_W4_L2CAP_DISCONNECT_RSP:
l2c_csm_w4_l2cap_disconnect_rsp(p_ccb, event, p_data);
break;
case CST_W4_L2CA_DISCONNECT_RSP:
l2c_csm_w4_l2ca_disconnect_rsp(p_ccb, event, p_data);
break;
default:
LOG_ERROR("Unhandled state %d, event %d", p_ccb->chnl_state, event);
break;
}
}
/*******************************************************************************
*
* Function l2c_csm_closed
*
* Description This function handles events when the channel is in
* CLOSED state. This state exists only when the link is
* being initially established.
*
* Returns void
*
******************************************************************************/
static void l2c_csm_closed(tL2C_CCB* p_ccb, tL2CEVT event, void* p_data) {
tL2C_CONN_INFO* p_ci = (tL2C_CONN_INFO*)p_data;
uint16_t local_cid = p_ccb->local_cid;
tL2CA_DISCONNECT_IND_CB* disconnect_ind;
if (p_ccb->p_rcb == NULL) {
LOG_ERROR("LCID: 0x%04x st: CLOSED evt: %s p_rcb == NULL",
p_ccb->local_cid, l2c_csm_get_event_name(event));
return;
}
disconnect_ind = p_ccb->p_rcb->api.pL2CA_DisconnectInd_Cb;
LOG_DEBUG("LCID: 0x%04x st: CLOSED evt: %s", p_ccb->local_cid,
l2c_csm_get_event_name(event));
switch (event) {
case L2CEVT_LP_DISCONNECT_IND: /* Link was disconnected */
LOG_DEBUG("Calling Disconnect_Ind_Cb(), CID: 0x%04x No Conf Needed",
p_ccb->local_cid);
l2cu_release_ccb(p_ccb);
(*disconnect_ind)(local_cid, false);
break;
case L2CEVT_LP_CONNECT_CFM: /* Link came up */
if (p_ccb->p_lcb->transport == BT_TRANSPORT_LE) {
p_ccb->chnl_state = CST_ORIG_W4_SEC_COMP;
l2ble_sec_access_req(p_ccb->p_lcb->remote_bd_addr, p_ccb->p_rcb->psm,
true, &l2c_link_sec_comp2, p_ccb);
} else {
p_ccb->chnl_state = CST_ORIG_W4_SEC_COMP;
btm_sec_l2cap_access_req(p_ccb->p_lcb->remote_bd_addr,
p_ccb->p_rcb->psm, true, &l2c_link_sec_comp,
p_ccb);
}
break;
case L2CEVT_LP_CONNECT_CFM_NEG: /* Link failed */
if (p_ci->status == HCI_ERR_CONNECTION_EXISTS) {
btm_acl_notif_conn_collision(p_ccb->p_lcb->remote_bd_addr);
} else {
l2cu_release_ccb(p_ccb);
(*p_ccb->p_rcb->api.pL2CA_Error_Cb)(local_cid, L2CAP_CONN_OTHER_ERROR);
}
break;
case L2CEVT_L2CA_CREDIT_BASED_CONNECT_REQ: /* API connect request */
case L2CEVT_L2CA_CONNECT_REQ:
if (p_ccb->p_lcb->transport == BT_TRANSPORT_LE) {
p_ccb->chnl_state = CST_ORIG_W4_SEC_COMP;
l2ble_sec_access_req(p_ccb->p_lcb->remote_bd_addr, p_ccb->p_rcb->psm,
true, &l2c_link_sec_comp2, p_ccb);
} else {
if (!BTM_SetLinkPolicyActiveMode(p_ccb->p_lcb->remote_bd_addr)) {
LOG_WARN("Unable to set link policy active");
}
/* If sec access does not result in started SEC_COM or COMP_NEG are
* already processed */
if (btm_sec_l2cap_access_req(
p_ccb->p_lcb->remote_bd_addr, p_ccb->p_rcb->psm, true,
&l2c_link_sec_comp, p_ccb) == BTM_CMD_STARTED) {
p_ccb->chnl_state = CST_ORIG_W4_SEC_COMP;
}
}
break;
case L2CEVT_SEC_COMP:
p_ccb->chnl_state = CST_W4_L2CAP_CONNECT_RSP;
/* Wait for the info resp in this state before sending connect req (if
* needed) */
if (!p_ccb->p_lcb->w4_info_rsp) {
/* Need to have at least one compatible channel to continue */
if (!l2c_fcr_chk_chan_modes(p_ccb)) {
l2cu_release_ccb(p_ccb);
(*p_ccb->p_rcb->api.pL2CA_Error_Cb)(local_cid,
L2CAP_CONN_OTHER_ERROR);
} else {
l2cu_send_peer_connect_req(p_ccb);
alarm_set_on_mloop(p_ccb->l2c_ccb_timer,
L2CAP_CHNL_CONNECT_TIMEOUT_MS,
l2c_ccb_timer_timeout, p_ccb);
}
}
break;
case L2CEVT_SEC_COMP_NEG: /* something is really bad with security */
l2cu_release_ccb(p_ccb);
(*p_ccb->p_rcb->api.pL2CA_Error_Cb)(local_cid, L2CAP_CONN_OTHER_ERROR);
break;
case L2CEVT_L2CAP_CREDIT_BASED_CONNECT_REQ: /* Peer connect request */
case L2CEVT_L2CAP_CONNECT_REQ:
/* stop link timer to avoid race condition between A2MP, Security, and
* L2CAP */
alarm_cancel(p_ccb->p_lcb->l2c_lcb_timer);
if (p_ccb->p_lcb->transport == BT_TRANSPORT_LE) {
p_ccb->chnl_state = CST_TERM_W4_SEC_COMP;
tL2CAP_LE_RESULT_CODE result = l2ble_sec_access_req(
p_ccb->p_lcb->remote_bd_addr, p_ccb->p_rcb->psm, false,
&l2c_link_sec_comp2, p_ccb);
switch (result) {
case L2CAP_LE_RESULT_INSUFFICIENT_AUTHORIZATION:
case L2CAP_LE_RESULT_UNACCEPTABLE_PARAMETERS:
case L2CAP_LE_RESULT_INVALID_PARAMETERS:
case L2CAP_LE_RESULT_INSUFFICIENT_AUTHENTICATION:
case L2CAP_LE_RESULT_INSUFFICIENT_ENCRYP_KEY_SIZE:
case L2CAP_LE_RESULT_INSUFFICIENT_ENCRYP:
l2cu_reject_ble_connection(p_ccb, p_ccb->remote_id, result);
l2cu_release_ccb(p_ccb);
break;
case L2CAP_LE_RESULT_CONN_OK:
case L2CAP_LE_RESULT_NO_PSM:
case L2CAP_LE_RESULT_NO_RESOURCES:
case L2CAP_LE_RESULT_INVALID_SOURCE_CID:
case L2CAP_LE_RESULT_SOURCE_CID_ALREADY_ALLOCATED:
break;
}
} else {
if (!BTM_SetLinkPolicyActiveMode(p_ccb->p_lcb->remote_bd_addr)) {
LOG_WARN("Unable to set link policy active");
}
p_ccb->chnl_state = CST_TERM_W4_SEC_COMP;
auto status = btm_sec_l2cap_access_req(p_ccb->p_lcb->remote_bd_addr,
p_ccb->p_rcb->psm, false,
&l2c_link_sec_comp, p_ccb);
if (status == BTM_CMD_STARTED) {
// started the security process, tell the peer to set a longer timer
l2cu_send_peer_connect_rsp(p_ccb, L2CAP_CONN_PENDING, 0);
} else {
LOG_INFO("Check security for psm 0x%04x, status %d",
p_ccb->p_rcb->psm, status);
}
}
break;
case L2CEVT_TIMEOUT:
l2cu_release_ccb(p_ccb);
(*p_ccb->p_rcb->api.pL2CA_Error_Cb)(local_cid, L2CAP_CONN_OTHER_ERROR);
break;
case L2CEVT_L2CAP_DATA: /* Peer data packet rcvd */
case L2CEVT_L2CA_DATA_WRITE: /* Upper layer data to send */
osi_free(p_data);
break;
case L2CEVT_L2CA_DISCONNECT_REQ: /* Upper wants to disconnect */
l2cu_release_ccb(p_ccb);
break;
default:
LOG_ERROR("Handling unexpected event:%s", l2c_csm_get_event_name(event));
}
LOG_DEBUG("Exit chnl_state=%s [%d], event=%s [%d]",
channel_state_text(p_ccb->chnl_state).c_str(), p_ccb->chnl_state,
l2c_csm_get_event_name(event), event);
}
/*******************************************************************************
*
* Function l2c_csm_orig_w4_sec_comp
*
* Description This function handles events when the channel is in
* CST_ORIG_W4_SEC_COMP state.
*
* Returns void
*
******************************************************************************/
static void l2c_csm_orig_w4_sec_comp(tL2C_CCB* p_ccb, tL2CEVT event,
void* p_data) {
tL2CA_DISCONNECT_IND_CB* disconnect_ind =
p_ccb->p_rcb->api.pL2CA_DisconnectInd_Cb;
uint16_t local_cid = p_ccb->local_cid;
LOG_DEBUG("%s - LCID: 0x%04x st: ORIG_W4_SEC_COMP evt: %s",
((p_ccb->p_lcb) && (p_ccb->p_lcb->transport == BT_TRANSPORT_LE))
? "LE "
: "",
p_ccb->local_cid, l2c_csm_get_event_name(event));
switch (event) {
case L2CEVT_LP_DISCONNECT_IND: /* Link was disconnected */
LOG_DEBUG("Calling Disconnect_Ind_Cb(), CID: 0x%04x No Conf Needed",
p_ccb->local_cid);
l2cu_release_ccb(p_ccb);
(*disconnect_ind)(local_cid, false);
break;
case L2CEVT_SEC_RE_SEND_CMD: /* BTM has enough info to proceed */
case L2CEVT_LP_CONNECT_CFM: /* Link came up */
if (p_ccb->p_lcb->transport == BT_TRANSPORT_LE) {
l2ble_sec_access_req(p_ccb->p_lcb->remote_bd_addr, p_ccb->p_rcb->psm,
false, &l2c_link_sec_comp2, p_ccb);
} else {
btm_sec_l2cap_access_req(p_ccb->p_lcb->remote_bd_addr,
p_ccb->p_rcb->psm, true, &l2c_link_sec_comp,
p_ccb);
}
break;
case L2CEVT_SEC_COMP: /* Security completed success */
/* Wait for the info resp in this state before sending connect req (if
* needed) */
p_ccb->chnl_state = CST_W4_L2CAP_CONNECT_RSP;
if (p_ccb->p_lcb->transport == BT_TRANSPORT_LE) {
alarm_set_on_mloop(p_ccb->l2c_ccb_timer, L2CAP_CHNL_CONNECT_TIMEOUT_MS,
l2c_ccb_timer_timeout, p_ccb);
l2cble_credit_based_conn_req(p_ccb); /* Start Connection */
} else {
if (!p_ccb->p_lcb->w4_info_rsp) {
/* Need to have at least one compatible channel to continue */
if (!l2c_fcr_chk_chan_modes(p_ccb)) {
l2cu_release_ccb(p_ccb);
(*p_ccb->p_rcb->api.pL2CA_Error_Cb)(local_cid,
L2CAP_CONN_OTHER_ERROR);
} else {
alarm_set_on_mloop(p_ccb->l2c_ccb_timer,
L2CAP_CHNL_CONNECT_TIMEOUT_MS,
l2c_ccb_timer_timeout, p_ccb);
l2cu_send_peer_connect_req(p_ccb); /* Start Connection */
}
}
}
break;
case L2CEVT_SEC_COMP_NEG:
/* If last channel immediately disconnect the ACL for better security.
Also prevents a race condition between BTM and L2CAP */
if ((p_ccb == p_ccb->p_lcb->ccb_queue.p_first_ccb) &&
(p_ccb == p_ccb->p_lcb->ccb_queue.p_last_ccb)) {
p_ccb->p_lcb->idle_timeout = 0;
}
l2cu_release_ccb(p_ccb);
(*p_ccb->p_rcb->api.pL2CA_Error_Cb)(local_cid, L2CAP_CONN_OTHER_ERROR);
break;
case L2CEVT_L2CA_DATA_WRITE: /* Upper layer data to send */
case L2CEVT_L2CAP_DATA: /* Peer data packet rcvd */
osi_free(p_data);
break;
case L2CEVT_L2CA_DISCONNECT_REQ: /* Upper wants to disconnect */
/* Tell security manager to abort */
btm_sec_abort_access_req(p_ccb->p_lcb->remote_bd_addr);
l2cu_release_ccb(p_ccb);
break;
default:
LOG_ERROR("Handling unexpected event:%s", l2c_csm_get_event_name(event));
}
LOG_DEBUG("Exit chnl_state=%s [%d], event=%s [%d]",
channel_state_text(p_ccb->chnl_state).c_str(), p_ccb->chnl_state,
l2c_csm_get_event_name(event), event);
}
/*******************************************************************************
*
* Function l2c_csm_term_w4_sec_comp
*
* Description This function handles events when the channel is in
* CST_TERM_W4_SEC_COMP state.
*
* Returns void
*
******************************************************************************/
static void l2c_csm_term_w4_sec_comp(tL2C_CCB* p_ccb, tL2CEVT event,
void* p_data) {
LOG_DEBUG("LCID: 0x%04x st: TERM_W4_SEC_COMP evt: %s", p_ccb->local_cid,
l2c_csm_get_event_name(event));
switch (event) {
case L2CEVT_LP_DISCONNECT_IND: /* Link was disconnected */
/* Tell security manager to abort */
btm_sec_abort_access_req(p_ccb->p_lcb->remote_bd_addr);
l2cu_release_ccb(p_ccb);
break;
case L2CEVT_SEC_COMP:
p_ccb->chnl_state = CST_W4_L2CA_CONNECT_RSP;
/* Wait for the info resp in next state before sending connect ind (if
* needed) */
if (!p_ccb->p_lcb->w4_info_rsp) {
LOG_DEBUG("Not waiting for info response, sending connect response");
/* Don't need to get info from peer or already retrieved so continue */
alarm_set_on_mloop(p_ccb->l2c_ccb_timer, L2CAP_CHNL_CONNECT_TIMEOUT_MS,
l2c_ccb_timer_timeout, p_ccb);
if (p_ccb->p_lcb->transport != BT_TRANSPORT_LE) {
LOG_DEBUG("Not LE connection, sending configure request");
l2c_csm_send_connect_rsp(p_ccb);
l2c_csm_send_config_req(p_ccb);
} else {
if (p_ccb->ecoc) {
/* Handle Credit Based Connection */
LOG_DEBUG("Calling CreditBasedConnect_Ind_Cb(), num of cids: %d",
p_ccb->p_lcb->pending_ecoc_conn_cnt);
std::vector<uint16_t> pending_cids;
for (int i = 0; i < p_ccb->p_lcb->pending_ecoc_conn_cnt; i++) {
uint16_t cid = p_ccb->p_lcb->pending_ecoc_connection_cids[i];
if (cid != 0) pending_cids.push_back(cid);
}
(*p_ccb->p_rcb->api.pL2CA_CreditBasedConnectInd_Cb)(
p_ccb->p_lcb->remote_bd_addr, pending_cids, p_ccb->p_rcb->psm,
p_ccb->peer_cfg.mtu, p_ccb->remote_id);
} else {
/* Handle BLE CoC */
LOG_DEBUG("Calling Connect_Ind_Cb(), CID: 0x%04x",
p_ccb->local_cid);
l2c_csm_send_connect_rsp(p_ccb);
l2c_csm_indicate_connection_open(p_ccb);
}
}
} else {
/*
** L2CAP Connect Response will be sent out by 3 sec timer expiration
** because Bluesoleil doesn't respond to L2CAP Information Request.
** Bluesoleil seems to disconnect ACL link as failure case, because
** it takes too long (4~7secs) to get response.
** product version : Bluesoleil 2.1.1.0 EDR Release 060123
** stack version : 05.04.11.20060119
*/
/* Waiting for the info resp, tell the peer to set a longer timer */
LOG_DEBUG("Waiting for info response, sending connect pending");
l2cu_send_peer_connect_rsp(p_ccb, L2CAP_CONN_PENDING, 0);
}
break;
case L2CEVT_SEC_COMP_NEG:
if (((tL2C_CONN_INFO*)p_data)->status == BTM_DELAY_CHECK) {
/* start a timer - encryption change not received before L2CAP connect
* req */
alarm_set_on_mloop(p_ccb->l2c_ccb_timer,
L2CAP_DELAY_CHECK_SM4_TIMEOUT_MS,
l2c_ccb_timer_timeout, p_ccb);
} else {
if (p_ccb->p_lcb->transport == BT_TRANSPORT_LE)
l2cu_reject_ble_connection(
p_ccb, p_ccb->remote_id,
L2CAP_LE_RESULT_INSUFFICIENT_AUTHENTICATION);
else
l2cu_send_peer_connect_rsp(p_ccb, L2CAP_CONN_SECURITY_BLOCK, 0);
l2cu_release_ccb(p_ccb);
}
break;
case L2CEVT_L2CA_DATA_WRITE: /* Upper layer data to send */
case L2CEVT_L2CAP_DATA: /* Peer data packet rcvd */
osi_free(p_data);
break;
case L2CEVT_L2CA_DISCONNECT_REQ: /* Upper wants to disconnect */
l2cu_release_ccb(p_ccb);
break;
case L2CEVT_L2CAP_DISCONNECT_REQ: /* Peer disconnected request */
l2cu_send_peer_disc_rsp(p_ccb->p_lcb, p_ccb->remote_id, p_ccb->local_cid,
p_ccb->remote_cid);
/* Tell security manager to abort */
btm_sec_abort_access_req(p_ccb->p_lcb->remote_bd_addr);
l2cu_release_ccb(p_ccb);
break;
case L2CEVT_TIMEOUT:
/* SM4 related. */
acl_disconnect_from_handle(p_ccb->p_lcb->Handle(), HCI_ERR_AUTH_FAILURE);
break;
case L2CEVT_SEC_RE_SEND_CMD: /* BTM has enough info to proceed */
btm_sec_l2cap_access_req(p_ccb->p_lcb->remote_bd_addr, p_ccb->p_rcb->psm,
false, &l2c_link_sec_comp, p_ccb);
break;
default:
LOG_ERROR("Handling unexpected event:%s", l2c_csm_get_event_name(event));
}
LOG_DEBUG("Exit chnl_state=%s [%d], event=%s [%d]",
channel_state_text(p_ccb->chnl_state).c_str(), p_ccb->chnl_state,
l2c_csm_get_event_name(event), event);
}
/*******************************************************************************
*
* Function l2c_csm_w4_l2cap_connect_rsp
*
* Description This function handles events when the channel is in
* CST_W4_L2CAP_CONNECT_RSP state.
*
* Returns void
*
******************************************************************************/
static void l2c_csm_w4_l2cap_connect_rsp(tL2C_CCB* p_ccb, tL2CEVT event,
void* p_data) {
tL2C_CONN_INFO* p_ci = (tL2C_CONN_INFO*)p_data;
tL2CA_DISCONNECT_IND_CB* disconnect_ind =
p_ccb->p_rcb->api.pL2CA_DisconnectInd_Cb;
tL2CA_CREDIT_BASED_CONNECT_CFM_CB* credit_based_connect_cfm =
p_ccb->p_rcb->api.pL2CA_CreditBasedConnectCfm_Cb;
uint16_t local_cid = p_ccb->local_cid;
tL2C_LCB* p_lcb = p_ccb->p_lcb;
LOG_DEBUG("LCID: 0x%04x st: W4_L2CAP_CON_RSP evt: %s", p_ccb->local_cid,
l2c_csm_get_event_name(event));
switch (event) {
case L2CEVT_LP_DISCONNECT_IND: /* Link was disconnected */
/* Send disc indication unless peer to peer race condition AND normal
* disconnect */
/* *((uint8_t *)p_data) != HCI_ERR_PEER_USER happens when peer device try
* to disconnect for normal reason */
p_ccb->chnl_state = CST_CLOSED;
if ((p_ccb->flags & CCB_FLAG_NO_RETRY) || !p_data ||
(*((uint8_t*)p_data) != HCI_ERR_PEER_USER)) {
LOG_DEBUG("Calling Disconnect_Ind_Cb(), CID: 0x%04x No Conf Needed",
p_ccb->local_cid);
l2cu_release_ccb(p_ccb);
(*disconnect_ind)(local_cid, false);
}
p_ccb->flags |= CCB_FLAG_NO_RETRY;
break;
case L2CEVT_L2CAP_CONNECT_RSP: /* Got peer connect confirm */
p_ccb->remote_cid = p_ci->remote_cid;
if (p_ccb->p_lcb->transport == BT_TRANSPORT_LE) {
/* Connection is completed */
alarm_cancel(p_ccb->l2c_ccb_timer);
p_ccb->chnl_state = CST_OPEN;
l2c_csm_indicate_connection_open(p_ccb);
p_ccb->local_conn_cfg = p_ccb->p_rcb->coc_cfg;
p_ccb->remote_credit_count = p_ccb->p_rcb->coc_cfg.credits;
l2c_csm_execute(p_ccb, L2CEVT_L2CA_CONNECT_RSP, NULL);
} else {
p_ccb->chnl_state = CST_CONFIG;
alarm_set_on_mloop(p_ccb->l2c_ccb_timer, L2CAP_CHNL_CFG_TIMEOUT_MS,
l2c_ccb_timer_timeout, p_ccb);
}
LOG_DEBUG("Calling Connect_Cfm_Cb(), CID: 0x%04x, Success",
p_ccb->local_cid);
l2c_csm_send_config_req(p_ccb);
break;
case L2CEVT_L2CAP_CONNECT_RSP_PND: /* Got peer connect pending */
p_ccb->remote_cid = p_ci->remote_cid;
alarm_set_on_mloop(p_ccb->l2c_ccb_timer,
L2CAP_CHNL_CONNECT_EXT_TIMEOUT_MS,
l2c_ccb_timer_timeout, p_ccb);
break;
case L2CEVT_L2CAP_CREDIT_BASED_CONNECT_RSP:
alarm_cancel(p_ccb->l2c_ccb_timer);
p_ccb->chnl_state = CST_OPEN;
LOG_DEBUG(
"Calling credit_based_connect_cfm(),"
"cid %d, result 0x%04x",
p_ccb->local_cid, L2CAP_CONN_OK);
(*credit_based_connect_cfm)(p_lcb->remote_bd_addr, p_ccb->local_cid,
p_ci->peer_mtu, L2CAP_CONN_OK);
break;
case L2CEVT_L2CAP_CREDIT_BASED_CONNECT_RSP_NEG:
LOG_DEBUG(
"Calling pL2CA_Error_Cb(),"
"cid %d, result 0x%04x",
local_cid, p_ci->l2cap_result);
(*p_ccb->p_rcb->api.pL2CA_Error_Cb)(local_cid, p_ci->l2cap_result);
l2cu_release_ccb(p_ccb);
break;
case L2CEVT_L2CAP_CONNECT_RSP_NEG: /* Peer rejected connection */
LOG(WARNING) << __func__ << ": L2CAP connection rejected, lcid="
<< loghex(p_ccb->local_cid)
<< ", reason=" << loghex(p_ci->l2cap_result);
l2cu_release_ccb(p_ccb);
(*p_ccb->p_rcb->api.pL2CA_Error_Cb)(local_cid, L2CAP_CONN_OTHER_ERROR);
break;
case L2CEVT_TIMEOUT:
LOG(WARNING) << __func__ << ": L2CAP connection timeout";
if (p_ccb->ecoc) {
for (int i = 0; i < p_lcb->pending_ecoc_conn_cnt; i++) {
uint16_t cid = p_lcb->pending_ecoc_connection_cids[i];
tL2C_CCB* temp_p_ccb = l2cu_find_ccb_by_cid(p_lcb, cid);
LOG(WARNING) << __func__ << ": lcid= " << loghex(cid);
(*p_ccb->p_rcb->api.pL2CA_Error_Cb)(p_ccb->local_cid,
L2CAP_CONN_TIMEOUT);
l2cu_release_ccb(temp_p_ccb);
}
p_lcb->pending_ecoc_conn_cnt = 0;
memset(p_lcb->pending_ecoc_connection_cids, 0,
L2CAP_CREDIT_BASED_MAX_CIDS);
} else {
LOG(WARNING) << __func__ << ": lcid= " << loghex(p_ccb->local_cid);
l2cu_release_ccb(p_ccb);
(*p_ccb->p_rcb->api.pL2CA_Error_Cb)(local_cid, L2CAP_CONN_OTHER_ERROR);
}
break;
case L2CEVT_L2CA_DISCONNECT_REQ: /* Upper wants to disconnect */
/* If we know peer CID from connect pending, we can send disconnect */
if (p_ccb->remote_cid != 0) {
l2cu_send_peer_disc_req(p_ccb);
p_ccb->chnl_state = CST_W4_L2CAP_DISCONNECT_RSP;
alarm_set_on_mloop(p_ccb->l2c_ccb_timer,
L2CAP_CHNL_DISCONNECT_TIMEOUT_MS,
l2c_ccb_timer_timeout, p_ccb);
} else {
l2cu_release_ccb(p_ccb);
}
break;
case L2CEVT_L2CA_DATA_WRITE: /* Upper layer data to send */
case L2CEVT_L2CAP_DATA: /* Peer data packet rcvd */
osi_free(p_data);
break;
case L2CEVT_L2CAP_INFO_RSP:
/* Need to have at least one compatible channel to continue */
if (!l2c_fcr_chk_chan_modes(p_ccb)) {
l2cu_release_ccb(p_ccb);
(*p_ccb->p_rcb->api.pL2CA_Error_Cb)(local_cid, L2CAP_CONN_OTHER_ERROR);
} else {
/* We have feature info, so now send peer connect request */
alarm_set_on_mloop(p_ccb->l2c_ccb_timer, L2CAP_CHNL_CONNECT_TIMEOUT_MS,
l2c_ccb_timer_timeout, p_ccb);
l2cu_send_peer_connect_req(p_ccb); /* Start Connection */
}
break;
default:
LOG_ERROR("Handling unexpected event:%s", l2c_csm_get_event_name(event));
}
LOG_DEBUG("Exit chnl_state=%s [%d], event=%s [%d]",
channel_state_text(p_ccb->chnl_state).c_str(), p_ccb->chnl_state,
l2c_csm_get_event_name(event), event);
}
/*******************************************************************************
*
* Function l2c_csm_w4_l2ca_connect_rsp
*
* Description This function handles events when the channel is in
* CST_W4_L2CA_CONNECT_RSP state.
*
* Returns void
*
******************************************************************************/
static void l2c_csm_w4_l2ca_connect_rsp(tL2C_CCB* p_ccb, tL2CEVT event,
void* p_data) {
tL2C_CONN_INFO* p_ci;
tL2CA_DISCONNECT_IND_CB* disconnect_ind =
p_ccb->p_rcb->api.pL2CA_DisconnectInd_Cb;
uint16_t local_cid = p_ccb->local_cid;
LOG_DEBUG("LCID: 0x%04x st: W4_L2CA_CON_RSP evt: %s", p_ccb->local_cid,
l2c_csm_get_event_name(event));
switch (event) {
case L2CEVT_LP_DISCONNECT_IND: /* Link was disconnected */
LOG_DEBUG("Calling Disconnect_Ind_Cb(), CID: 0x%04x No Conf Needed",
p_ccb->local_cid);
l2cu_release_ccb(p_ccb);
(*disconnect_ind)(local_cid, false);
break;
case L2CEVT_L2CA_CREDIT_BASED_CONNECT_RSP:
p_ci = (tL2C_CONN_INFO*)p_data;
if (p_ccb->p_lcb && p_ccb->p_lcb->transport != BT_TRANSPORT_LE) {
LOG_WARN("LE link doesn't exist");
return;
}
l2cu_send_peer_credit_based_conn_res(p_ccb, p_ci->lcids,
p_ci->l2cap_result);
alarm_cancel(p_ccb->l2c_ccb_timer);
for (int i = 0; i < p_ccb->p_lcb->pending_ecoc_conn_cnt; i++) {
uint16_t cid = p_ccb->p_lcb->pending_ecoc_connection_cids[i];
tL2C_CCB* temp_p_ccb = l2cu_find_ccb_by_cid(p_ccb->p_lcb, cid);
auto it = std::find(p_ci->lcids.begin(), p_ci->lcids.end(), cid);
if (it != p_ci->lcids.end()) {
temp_p_ccb->chnl_state = CST_OPEN;
} else {
l2cu_release_ccb(temp_p_ccb);
}
}
p_ccb->p_lcb->pending_ecoc_conn_cnt = 0;
memset(p_ccb->p_lcb->pending_ecoc_connection_cids, 0,
L2CAP_CREDIT_BASED_MAX_CIDS);
break;
case L2CEVT_L2CA_CONNECT_RSP:
p_ci = (tL2C_CONN_INFO*)p_data;
if (p_ccb->p_lcb->transport == BT_TRANSPORT_LE) {
/* Result should be OK or Reject */
if ((!p_ci) || (p_ci->l2cap_result == L2CAP_CONN_OK)) {
l2cble_credit_based_conn_res(p_ccb, L2CAP_CONN_OK);
p_ccb->chnl_state = CST_OPEN;
alarm_cancel(p_ccb->l2c_ccb_timer);
} else {
l2cble_credit_based_conn_res(p_ccb, p_ci->l2cap_result);
l2cu_release_ccb(p_ccb);
}
} else {
/* Result should be OK or PENDING */
if ((!p_ci) || (p_ci->l2cap_result == L2CAP_CONN_OK)) {
LOG_DEBUG("Sending connection ok for BR_EDR");
l2cu_send_peer_connect_rsp(p_ccb, L2CAP_CONN_OK, 0);
p_ccb->chnl_state = CST_CONFIG;
alarm_set_on_mloop(p_ccb->l2c_ccb_timer, L2CAP_CHNL_CFG_TIMEOUT_MS,
l2c_ccb_timer_timeout, p_ccb);
} else {
/* If pending, stay in same state and start extended timer */
LOG_DEBUG("Sending connection result %d and status %d",
p_ci->l2cap_result, p_ci->l2cap_status);
l2cu_send_peer_connect_rsp(p_ccb, p_ci->l2cap_result,
p_ci->l2cap_status);
alarm_set_on_mloop(p_ccb->l2c_ccb_timer,
L2CAP_CHNL_CONNECT_EXT_TIMEOUT_MS,
l2c_ccb_timer_timeout, p_ccb);
}
}
break;
case L2CEVT_L2CA_CREDIT_BASED_CONNECT_RSP_NEG:
p_ci = (tL2C_CONN_INFO*)p_data;
if (p_ccb->p_lcb && p_ccb->p_lcb->transport == BT_TRANSPORT_LE) {
l2cu_send_peer_credit_based_conn_res(p_ccb, p_ci->lcids,
p_ci->l2cap_result);
}
alarm_cancel(p_ccb->l2c_ccb_timer);
for (int i = 0; i < p_ccb->p_lcb->pending_ecoc_conn_cnt; i++) {
uint16_t cid = p_ccb->p_lcb->pending_ecoc_connection_cids[i];
tL2C_CCB* temp_p_ccb = l2cu_find_ccb_by_cid(p_ccb->p_lcb, cid);
l2cu_release_ccb(temp_p_ccb);
}
p_ccb->p_lcb->pending_ecoc_conn_cnt = 0;
memset(p_ccb->p_lcb->pending_ecoc_connection_cids, 0,
L2CAP_CREDIT_BASED_MAX_CIDS);
break;
case L2CEVT_L2CA_CONNECT_RSP_NEG:
p_ci = (tL2C_CONN_INFO*)p_data;
if (p_ccb->p_lcb->transport == BT_TRANSPORT_LE)
l2cble_credit_based_conn_res(p_ccb, p_ci->l2cap_result);
else
l2cu_send_peer_connect_rsp(p_ccb, p_ci->l2cap_result,
p_ci->l2cap_status);
l2cu_release_ccb(p_ccb);
break;
case L2CEVT_TIMEOUT:
l2cu_send_peer_connect_rsp(p_ccb, L2CAP_CONN_NO_PSM, 0);
LOG_DEBUG("Calling Disconnect_Ind_Cb(), CID: 0x%04x No Conf Needed",
p_ccb->local_cid);
l2cu_release_ccb(p_ccb);
(*disconnect_ind)(local_cid, false);
break;
case L2CEVT_L2CA_DATA_WRITE: /* Upper layer data to send */
case L2CEVT_L2CAP_DATA: /* Peer data packet rcvd */
osi_free(p_data);
break;
case L2CEVT_L2CA_DISCONNECT_REQ: /* Upper wants to disconnect */
l2cu_send_peer_disc_req(p_ccb);
p_ccb->chnl_state = CST_W4_L2CAP_DISCONNECT_RSP;
alarm_set_on_mloop(p_ccb->l2c_ccb_timer, L2CAP_CHNL_DISCONNECT_TIMEOUT_MS,
l2c_ccb_timer_timeout, p_ccb);
break;
case L2CEVT_L2CAP_INFO_RSP:
/* We have feature info, so now give the upper layer connect IND */
alarm_set_on_mloop(p_ccb->l2c_ccb_timer, L2CAP_CHNL_CONNECT_TIMEOUT_MS,
l2c_ccb_timer_timeout, p_ccb);
LOG_DEBUG("Calling Connect_Ind_Cb(), CID: 0x%04x", p_ccb->local_cid);
l2c_csm_send_connect_rsp(p_ccb);
l2c_csm_send_config_req(p_ccb);
break;
default:
LOG_ERROR("Handling unexpected event:%s", l2c_csm_get_event_name(event));
}
LOG_DEBUG("Exit chnl_state=%s [%d], event=%s [%d]",
channel_state_text(p_ccb->chnl_state).c_str(), p_ccb->chnl_state,
l2c_csm_get_event_name(event), event);
}
/*******************************************************************************
*
* Function l2c_csm_config
*
* Description This function handles events when the channel is in
* CONFIG state.
*
* Returns void
*
******************************************************************************/
static void l2c_csm_config(tL2C_CCB* p_ccb, tL2CEVT event, void* p_data) {
tL2CAP_CFG_INFO* p_cfg = (tL2CAP_CFG_INFO*)p_data;
tL2CA_DISCONNECT_IND_CB* disconnect_ind =
p_ccb->p_rcb->api.pL2CA_DisconnectInd_Cb;
uint16_t local_cid = p_ccb->local_cid;
uint8_t cfg_result;
tL2C_LCB* p_lcb = p_ccb->p_lcb;
tL2C_CCB* temp_p_ccb;
tL2CAP_LE_CFG_INFO* p_le_cfg = (tL2CAP_LE_CFG_INFO*)p_data;
LOG_DEBUG("LCID: 0x%04x st: CONFIG evt: %s", p_ccb->local_cid,
l2c_csm_get_event_name(event));
switch (event) {
case L2CEVT_LP_DISCONNECT_IND: /* Link was disconnected */
LOG_DEBUG("Calling Disconnect_Ind_Cb(), CID: 0x%04x No Conf Needed",
p_ccb->local_cid);
l2cu_release_ccb(p_ccb);
(*disconnect_ind)(local_cid, false);
break;
case L2CEVT_L2CAP_CREDIT_BASED_RECONFIG_REQ:
/* For ecoc reconfig is handled below in l2c_ble. In case of success
* let us notify upper layer about the reconfig
*/
LOG_DEBUG("Calling LeReconfigCompleted_Cb(), CID: 0x%04x",
p_ccb->local_cid);
(*p_ccb->p_rcb->api.pL2CA_CreditBasedReconfigCompleted_Cb)(
p_lcb->remote_bd_addr, p_ccb->local_cid, false, p_le_cfg);
break;
case L2CEVT_L2CAP_CONFIG_REQ: /* Peer config request */
cfg_result = l2cu_process_peer_cfg_req(p_ccb, p_cfg);
if (cfg_result == L2CAP_PEER_CFG_OK) {
LOG_DEBUG("Calling Config_Req_Cb(), CID: 0x%04x, C-bit %d",
p_ccb->local_cid, (p_cfg->flags & L2CAP_CFG_FLAGS_MASK_CONT));
l2c_csm_send_config_rsp_ok(p_ccb);
if (p_ccb->config_done & OB_CFG_DONE) {
if (p_ccb->remote_config_rsp_result == L2CAP_CFG_OK) {
l2c_csm_indicate_connection_open(p_ccb);
} else {
if (p_ccb->connection_initiator == L2CAP_INITIATOR_LOCAL) {
(*p_ccb->p_rcb->api.pL2CA_Error_Cb)(p_ccb->local_cid,
L2CAP_CFG_FAILED_NO_REASON);
}
}
}
} else if (cfg_result == L2CAP_PEER_CFG_DISCONNECT) {
/* Disconnect if channels are incompatible */
LOG_DEBUG("incompatible configurations disconnect");
l2cu_disconnect_chnl(p_ccb);
} else /* Return error to peer so it can renegotiate if possible */
{
LOG_DEBUG("incompatible configurations trying reconfig");
l2cu_send_peer_config_rsp(p_ccb, p_cfg);
}
break;
case L2CEVT_L2CAP_CREDIT_BASED_RECONFIG_RSP:
p_ccb->config_done |= OB_CFG_DONE;
p_ccb->config_done |= RECONFIG_FLAG;
p_ccb->chnl_state = CST_OPEN;
alarm_cancel(p_ccb->l2c_ccb_timer);
LOG_DEBUG("Calling Config_Rsp_Cb(), CID: 0x%04x", p_ccb->local_cid);
p_ccb->p_rcb->api.pL2CA_CreditBasedReconfigCompleted_Cb(
p_lcb->remote_bd_addr, p_ccb->local_cid, true, p_le_cfg);
break;
case L2CEVT_L2CAP_CONFIG_RSP: /* Peer config response */
l2cu_process_peer_cfg_rsp(p_ccb, p_cfg);
/* TBD: When config options grow beyong minimum MTU (48 bytes)
* logic needs to be added to handle responses with
* continuation bit set in flags field.
* 1. Send additional config request out until C-bit is cleared in
* response
*/
p_ccb->config_done |= OB_CFG_DONE;
if (p_ccb->config_done & IB_CFG_DONE) {
/* Verify two sides are in compatible modes before continuing */
if (p_ccb->our_cfg.fcr.mode != p_ccb->peer_cfg.fcr.mode) {
l2cu_send_peer_disc_req(p_ccb);
LOG_WARN(
"Calling Disconnect_Ind_Cb(Incompatible CFG), CID: "
"0x%04x No Conf Needed",
p_ccb->local_cid);
l2cu_release_ccb(p_ccb);
(*disconnect_ind)(local_cid, false);
break;
}
p_ccb->config_done |= RECONFIG_FLAG;
p_ccb->chnl_state = CST_OPEN;
l2c_link_adjust_chnl_allocation();
alarm_cancel(p_ccb->l2c_ccb_timer);
/* If using eRTM and waiting for an ACK, restart the ACK timer */
if (p_ccb->fcrb.wait_ack) l2c_fcr_start_timer(p_ccb);
/*
** check p_ccb->our_cfg.fcr.mon_tout and
*p_ccb->our_cfg.fcr.rtrans_tout
** we may set them to zero when sending config request during
*renegotiation
*/
if ((p_ccb->our_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) &&
((p_ccb->our_cfg.fcr.mon_tout == 0) ||
(p_ccb->our_cfg.fcr.rtrans_tout))) {
l2c_fcr_adj_monitor_retran_timeout(p_ccb);
}
/* See if we can forward anything on the hold queue */
if (!fixed_queue_is_empty(p_ccb->xmit_hold_q)) {
l2c_link_check_send_pkts(p_ccb->p_lcb, 0, NULL);
}
}
LOG_DEBUG("Calling Config_Rsp_Cb(), CID: 0x%04x", p_ccb->local_cid);
p_ccb->remote_config_rsp_result = p_cfg->result;
if (p_ccb->config_done & IB_CFG_DONE) {
l2c_csm_indicate_connection_open(p_ccb);
}
break;
case L2CEVT_L2CAP_CONFIG_RSP_NEG: /* Peer config error rsp */
/* Disable the Timer */
alarm_cancel(p_ccb->l2c_ccb_timer);
/* If failure was channel mode try to renegotiate */
if (!l2c_fcr_renegotiate_chan(p_ccb, p_cfg)) {
LOG_DEBUG("Calling Config_Rsp_Cb(), CID: 0x%04x, Failure: %d",
p_ccb->local_cid, p_cfg->result);
if (p_ccb->connection_initiator == L2CAP_INITIATOR_LOCAL) {
(*p_ccb->p_rcb->api.pL2CA_Error_Cb)(p_ccb->local_cid,
L2CAP_CFG_FAILED_NO_REASON);
}
}
break;
case L2CEVT_L2CAP_DISCONNECT_REQ: /* Peer disconnected request */
alarm_set_on_mloop(p_ccb->l2c_ccb_timer, L2CAP_CHNL_DISCONNECT_TIMEOUT_MS,
l2c_ccb_timer_timeout, p_ccb);
p_ccb->chnl_state = CST_W4_L2CA_DISCONNECT_RSP;
LOG_DEBUG("Calling Disconnect_Ind_Cb(), CID: 0x%04x Conf Needed",
p_ccb->local_cid);
(*p_ccb->p_rcb->api.pL2CA_DisconnectInd_Cb)(p_ccb->local_cid, true);
l2c_csm_send_disconnect_rsp(p_ccb);
break;
case L2CEVT_L2CA_CREDIT_BASED_RECONFIG_REQ:
l2cu_send_credit_based_reconfig_req(p_ccb, (tL2CAP_LE_CFG_INFO*)p_data);
alarm_set_on_mloop(p_ccb->l2c_ccb_timer, L2CAP_CHNL_CFG_TIMEOUT_MS,
l2c_ccb_timer_timeout, p_ccb);
break;
case L2CEVT_L2CA_CONFIG_REQ: /* Upper layer config req */
l2cu_process_our_cfg_req(p_ccb, p_cfg);
l2cu_send_peer_config_req(p_ccb, p_cfg);
alarm_set_on_mloop(p_ccb->l2c_ccb_timer, L2CAP_CHNL_CFG_TIMEOUT_MS,
l2c_ccb_timer_timeout, p_ccb);
break;
case L2CEVT_L2CA_CONFIG_RSP: /* Upper layer config rsp */
l2cu_process_our_cfg_rsp(p_ccb, p_cfg);
p_ccb->config_done |= IB_CFG_DONE;
if (p_ccb->config_done & OB_CFG_DONE) {
/* Verify two sides are in compatible modes before continuing */
if (p_ccb->our_cfg.fcr.mode != p_ccb->peer_cfg.fcr.mode) {
l2cu_send_peer_disc_req(p_ccb);
LOG_WARN(
"Calling Disconnect_Ind_Cb(Incompatible CFG), CID: "
"0x%04x No Conf Needed",
p_ccb->local_cid);
l2cu_release_ccb(p_ccb);
(*disconnect_ind)(local_cid, false);
break;
}
p_ccb->config_done |= RECONFIG_FLAG;
p_ccb->chnl_state = CST_OPEN;
l2c_link_adjust_chnl_allocation();
alarm_cancel(p_ccb->l2c_ccb_timer);
}
l2cu_send_peer_config_rsp(p_ccb, p_cfg);
/* If using eRTM and waiting for an ACK, restart the ACK timer */
if (p_ccb->fcrb.wait_ack) l2c_fcr_start_timer(p_ccb);
/* See if we can forward anything on the hold queue */
if ((p_ccb->chnl_state == CST_OPEN) &&
(!fixed_queue_is_empty(p_ccb->xmit_hold_q))) {
l2c_link_check_send_pkts(p_ccb->p_lcb, 0, NULL);
}
break;
case L2CEVT_L2CA_DISCONNECT_REQ: /* Upper wants to disconnect */
l2cu_send_peer_disc_req(p_ccb);
p_ccb->chnl_state = CST_W4_L2CAP_DISCONNECT_RSP;
alarm_set_on_mloop(p_ccb->l2c_ccb_timer, L2CAP_CHNL_DISCONNECT_TIMEOUT_MS,
l2c_ccb_timer_timeout, p_ccb);
break;
case L2CEVT_L2CAP_DATA: /* Peer data packet rcvd */
LOG_DEBUG("Calling DataInd_Cb(), CID: 0x%04x", p_ccb->local_cid);
if (p_ccb->local_cid >= L2CAP_FIRST_FIXED_CHNL &&
p_ccb->local_cid <= L2CAP_LAST_FIXED_CHNL) {
if (p_ccb->local_cid < L2CAP_BASE_APPL_CID) {
if (l2cb.fixed_reg[p_ccb->local_cid - L2CAP_FIRST_FIXED_CHNL]
.pL2CA_FixedData_Cb != nullptr) {
p_ccb->metrics.rx(static_cast<BT_HDR*>(p_data)->len);
(*l2cb.fixed_reg[p_ccb->local_cid - L2CAP_FIRST_FIXED_CHNL]
.pL2CA_FixedData_Cb)(p_ccb->local_cid,
p_ccb->p_lcb->remote_bd_addr,
(BT_HDR*)p_data);
} else {
if (p_data != nullptr) osi_free_and_reset(&p_data);
}
break;
}
}
if (p_data) p_ccb->metrics.rx(static_cast<BT_HDR*>(p_data)->len);
(*p_ccb->p_rcb->api.pL2CA_DataInd_Cb)(p_ccb->local_cid, (BT_HDR*)p_data);
break;
case L2CEVT_L2CA_DATA_WRITE: /* Upper layer data to send */
if (p_ccb->config_done & OB_CFG_DONE)
l2c_enqueue_peer_data(p_ccb, (BT_HDR*)p_data);
else
osi_free(p_data);
break;
case L2CEVT_TIMEOUT:
if (p_ccb->ecoc) {
for (temp_p_ccb = p_lcb->ccb_queue.p_first_ccb; temp_p_ccb;
temp_p_ccb = temp_p_ccb->p_next_ccb) {
if ((temp_p_ccb->in_use) && (temp_p_ccb->reconfig_started)) {
(*temp_p_ccb->p_rcb->api.pL2CA_DisconnectInd_Cb)(
temp_p_ccb->local_cid, false);
l2cu_release_ccb(temp_p_ccb);
}
}
acl_disconnect_from_handle(p_ccb->p_lcb->Handle(),
HCI_ERR_CONN_CAUSE_LOCAL_HOST);
return;
}
l2cu_send_peer_disc_req(p_ccb);
LOG_DEBUG("Calling Disconnect_Ind_Cb(), CID: 0x%04x No Conf Needed",
p_ccb->local_cid);
l2cu_release_ccb(p_ccb);
(*disconnect_ind)(local_cid, false);
break;
default:
LOG_ERROR("Handling unexpected event:%s", l2c_csm_get_event_name(event));
}
LOG_DEBUG("Exit chnl_state=%s [%d], event=%s [%d]",
channel_state_text(p_ccb->chnl_state).c_str(), p_ccb->chnl_state,
l2c_csm_get_event_name(event), event);
}
/*******************************************************************************
*
* Function l2c_csm_open
*
* Description This function handles events when the channel is in
* OPEN state.
*
* Returns void
*
******************************************************************************/
static void l2c_csm_open(tL2C_CCB* p_ccb, tL2CEVT event, void* p_data) {
uint16_t local_cid = p_ccb->local_cid;
tL2CAP_CFG_INFO* p_cfg;
tL2C_CHNL_STATE tempstate;
uint8_t tempcfgdone;
uint8_t cfg_result;
uint16_t credit = 0;
tL2CAP_LE_CFG_INFO* p_le_cfg = (tL2CAP_LE_CFG_INFO*)p_data;
LOG_DEBUG("LCID: 0x%04x st: OPEN evt: %s", p_ccb->local_cid,
l2c_csm_get_event_name(event));
switch (event) {
case L2CEVT_LP_DISCONNECT_IND: /* Link was disconnected */
LOG_DEBUG("Calling Disconnect_Ind_Cb(), CID: 0x%04x No Conf Needed",
p_ccb->local_cid);
l2cu_release_ccb(p_ccb);
if (p_ccb->p_rcb)
(*p_ccb->p_rcb->api.pL2CA_DisconnectInd_Cb)(local_cid, false);
break;
case L2CEVT_L2CAP_CREDIT_BASED_RECONFIG_REQ:
/* For ecoc reconfig is handled below in l2c_ble. In case of success
* let us notify upper layer about the reconfig
*/
LOG_DEBUG("Calling LeReconfigCompleted_Cb(), CID: 0x%04x",
p_ccb->local_cid);
(*p_ccb->p_rcb->api.pL2CA_CreditBasedReconfigCompleted_Cb)(
p_ccb->p_lcb->remote_bd_addr, p_ccb->local_cid, false, p_le_cfg);
break;
case L2CEVT_L2CAP_CONFIG_REQ: /* Peer config request */
p_cfg = (tL2CAP_CFG_INFO*)p_data;
tempstate = p_ccb->chnl_state;
tempcfgdone = p_ccb->config_done;
p_ccb->chnl_state = CST_CONFIG;
// clear cached configuration in case reconfig takes place later
p_ccb->peer_cfg.mtu_present = false;
p_ccb->peer_cfg.flush_to_present = false;
p_ccb->peer_cfg.qos_present = false;
p_ccb->config_done &= ~IB_CFG_DONE;
alarm_set_on_mloop(p_ccb->l2c_ccb_timer, L2CAP_CHNL_CFG_TIMEOUT_MS,
l2c_ccb_timer_timeout, p_ccb);
cfg_result = l2cu_process_peer_cfg_req(p_ccb, p_cfg);
if (cfg_result == L2CAP_PEER_CFG_OK) {
(*p_ccb->p_rcb->api.pL2CA_ConfigInd_Cb)(p_ccb->local_cid, p_cfg);
l2c_csm_send_config_rsp_ok(p_ccb);
}
/* Error in config parameters: reset state and config flag */
else if (cfg_result == L2CAP_PEER_CFG_UNACCEPTABLE) {
alarm_cancel(p_ccb->l2c_ccb_timer);
p_ccb->chnl_state = tempstate;
p_ccb->config_done = tempcfgdone;
l2cu_send_peer_config_rsp(p_ccb, p_cfg);
} else /* L2CAP_PEER_CFG_DISCONNECT */
{
/* Disconnect if channels are incompatible
* Note this should not occur if reconfigure
* since this should have never passed original config.
*/
l2cu_disconnect_chnl(p_ccb);
}
break;
case L2CEVT_L2CAP_DISCONNECT_REQ: /* Peer disconnected request */
if (p_ccb->p_lcb->transport != BT_TRANSPORT_LE) {
if (!BTM_SetLinkPolicyActiveMode(p_ccb->p_lcb->remote_bd_addr)) {
LOG_WARN("Unable to set link policy active");
}
}
p_ccb->chnl_state = CST_W4_L2CA_DISCONNECT_RSP;
alarm_set_on_mloop(p_ccb->l2c_ccb_timer, L2CAP_CHNL_DISCONNECT_TIMEOUT_MS,
l2c_ccb_timer_timeout, p_ccb);
LOG_DEBUG("Calling Disconnect_Ind_Cb(), CID: 0x%04x Conf Needed",
p_ccb->local_cid);
(*p_ccb->p_rcb->api.pL2CA_DisconnectInd_Cb)(p_ccb->local_cid, true);
l2c_csm_send_disconnect_rsp(p_ccb);
break;
case L2CEVT_L2CAP_DATA: /* Peer data packet rcvd */
if ((p_ccb->p_rcb) && (p_ccb->p_rcb->api.pL2CA_DataInd_Cb)) {
p_ccb->metrics.rx(static_cast<BT_HDR*>(p_data)->len);
(*p_ccb->p_rcb->api.pL2CA_DataInd_Cb)(p_ccb->local_cid,
(BT_HDR*)p_data);
}
break;
case L2CEVT_L2CA_DISCONNECT_REQ: /* Upper wants to disconnect */
if (p_ccb->p_lcb->transport != BT_TRANSPORT_LE) {
/* Make sure we are not in sniff mode */
if (!BTM_SetLinkPolicyActiveMode(p_ccb->p_lcb->remote_bd_addr)) {
LOG_WARN("Unable to set link policy active");
}
}
if (p_ccb->p_lcb->transport == BT_TRANSPORT_LE)
l2cble_send_peer_disc_req(p_ccb);
else
l2cu_send_peer_disc_req(p_ccb);
p_ccb->chnl_state = CST_W4_L2CAP_DISCONNECT_RSP;
alarm_set_on_mloop(p_ccb->l2c_ccb_timer, L2CAP_CHNL_DISCONNECT_TIMEOUT_MS,
l2c_ccb_timer_timeout, p_ccb);
break;
case L2CEVT_L2CA_DATA_WRITE: /* Upper layer data to send */
l2c_enqueue_peer_data(p_ccb, (BT_HDR*)p_data);
l2c_link_check_send_pkts(p_ccb->p_lcb, 0, NULL);
break;
case L2CEVT_L2CA_CREDIT_BASED_RECONFIG_REQ:
p_ccb->chnl_state = CST_CONFIG;
p_ccb->config_done &= ~OB_CFG_DONE;
l2cu_send_credit_based_reconfig_req(p_ccb, (tL2CAP_LE_CFG_INFO*)p_data);
alarm_set_on_mloop(p_ccb->l2c_ccb_timer, L2CAP_CHNL_CFG_TIMEOUT_MS,
l2c_ccb_timer_timeout, p_ccb);
break;
case L2CEVT_L2CA_CONFIG_REQ: /* Upper layer config req */
LOG_ERROR(
"Dropping L2CAP re-config request because there is no usage and "
"should not be invoked");
break;
case L2CEVT_TIMEOUT:
/* Process the monitor/retransmission time-outs in flow control/retrans
* mode */
if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE)
l2c_fcr_proc_tout(p_ccb);
break;
case L2CEVT_ACK_TIMEOUT:
l2c_fcr_proc_ack_tout(p_ccb);
break;
case L2CEVT_L2CA_SEND_FLOW_CONTROL_CREDIT:
LOG_DEBUG("Sending credit");
credit = *(uint16_t*)p_data;
l2cble_send_flow_control_credit(p_ccb, credit);
break;
case L2CEVT_L2CAP_RECV_FLOW_CONTROL_CREDIT:
credit = *(uint16_t*)p_data;
LOG_DEBUG("Credits received %d", credit);
if ((p_ccb->peer_conn_cfg.credits + credit) > L2CAP_LE_CREDIT_MAX) {
/* we have received credits more than max coc credits,
* so disconnecting the Le Coc Channel
*/
l2cble_send_peer_disc_req(p_ccb);
} else {
p_ccb->peer_conn_cfg.credits += credit;
l2c_link_check_send_pkts(p_ccb->p_lcb, 0, NULL);
}
break;
default:
LOG_ERROR("Handling unexpected event:%s", l2c_csm_get_event_name(event));
}
LOG_DEBUG("Exit chnl_state=%s [%d], event=%s [%d]",
channel_state_text(p_ccb->chnl_state).c_str(), p_ccb->chnl_state,
l2c_csm_get_event_name(event), event);
}
/*******************************************************************************
*
* Function l2c_csm_w4_l2cap_disconnect_rsp
*
* Description This function handles events when the channel is in
* CST_W4_L2CAP_DISCONNECT_RSP state.
*
* Returns void
*
******************************************************************************/
static void l2c_csm_w4_l2cap_disconnect_rsp(tL2C_CCB* p_ccb, tL2CEVT event,
void* p_data) {
LOG_DEBUG("LCID: 0x%04x st: W4_L2CAP_DISC_RSP evt: %s", p_ccb->local_cid,
l2c_csm_get_event_name(event));
switch (event) {
case L2CEVT_L2CAP_DISCONNECT_RSP: /* Peer disconnect response */
l2cu_release_ccb(p_ccb);
break;
case L2CEVT_L2CAP_DISCONNECT_REQ: /* Peer disconnect request */
l2cu_send_peer_disc_rsp(p_ccb->p_lcb, p_ccb->remote_id, p_ccb->local_cid,
p_ccb->remote_cid);
l2cu_release_ccb(p_ccb);
break;
case L2CEVT_LP_DISCONNECT_IND: /* Link was disconnected */
case L2CEVT_TIMEOUT: /* Timeout */
l2cu_release_ccb(p_ccb);
break;
case L2CEVT_L2CAP_DATA: /* Peer data packet rcvd */
case L2CEVT_L2CA_DATA_WRITE: /* Upper layer data to send */
osi_free(p_data);
break;
default:
LOG_ERROR("Handling unexpected event:%s", l2c_csm_get_event_name(event));
}
LOG_DEBUG("Exit chnl_state=%s [%d], event=%s [%d]",
channel_state_text(p_ccb->chnl_state).c_str(), p_ccb->chnl_state,
l2c_csm_get_event_name(event), event);
}
/*******************************************************************************
*
* Function l2c_csm_w4_l2ca_disconnect_rsp
*
* Description This function handles events when the channel is in
* CST_W4_L2CA_DISCONNECT_RSP state.
*
* Returns void
*
******************************************************************************/
static void l2c_csm_w4_l2ca_disconnect_rsp(tL2C_CCB* p_ccb, tL2CEVT event,
void* p_data) {
tL2CA_DISCONNECT_IND_CB* disconnect_ind =
p_ccb->p_rcb->api.pL2CA_DisconnectInd_Cb;
uint16_t local_cid = p_ccb->local_cid;
LOG_DEBUG("LCID: 0x%04x st: W4_L2CA_DISC_RSP evt: %s", p_ccb->local_cid,
l2c_csm_get_event_name(event));
switch (event) {
case L2CEVT_LP_DISCONNECT_IND: /* Link was disconnected */
LOG_DEBUG("Calling Disconnect_Ind_Cb(), CID: 0x%04x No Conf Needed",
p_ccb->local_cid);
l2cu_release_ccb(p_ccb);
(*disconnect_ind)(local_cid, false);
break;
case L2CEVT_TIMEOUT:
l2cu_send_peer_disc_rsp(p_ccb->p_lcb, p_ccb->remote_id, p_ccb->local_cid,
p_ccb->remote_cid);
LOG_DEBUG("Calling Disconnect_Ind_Cb(), CID: 0x%04x No Conf Needed",
p_ccb->local_cid);
l2cu_release_ccb(p_ccb);
(*disconnect_ind)(local_cid, false);
break;
case L2CEVT_L2CA_DISCONNECT_REQ: /* Upper disconnect request */
case L2CEVT_L2CA_DISCONNECT_RSP: /* Upper disconnect response */
l2cu_send_peer_disc_rsp(p_ccb->p_lcb, p_ccb->remote_id, p_ccb->local_cid,
p_ccb->remote_cid);
l2cu_release_ccb(p_ccb);
break;
case L2CEVT_L2CAP_DATA: /* Peer data packet rcvd */
case L2CEVT_L2CA_DATA_WRITE: /* Upper layer data to send */
osi_free(p_data);
break;
default:
LOG_ERROR("Handling unexpected event:%s", l2c_csm_get_event_name(event));
}
LOG_DEBUG("Exit chnl_state=%s [%d], event=%s [%d]",
channel_state_text(p_ccb->chnl_state).c_str(), p_ccb->chnl_state,
l2c_csm_get_event_name(event), event);
}
/*******************************************************************************
*
* Function l2c_csm_get_event_name
*
* Description This function returns the event name.
*
* NOTE conditionally compiled to save memory.
*
* Returns pointer to the name
*
******************************************************************************/
static const char* l2c_csm_get_event_name(tL2CEVT event) {
switch (event) {
case L2CEVT_LP_CONNECT_CFM: /* Lower layer connect confirm */
return ("LOWER_LAYER_CONNECT_CFM");
case L2CEVT_LP_CONNECT_CFM_NEG: /* Lower layer connect confirm (failed) */
return ("LOWER_LAYER_CONNECT_CFM_NEG");
case L2CEVT_LP_CONNECT_IND: /* Lower layer connect indication */
return ("LOWER_LAYER_CONNECT_IND");
case L2CEVT_LP_DISCONNECT_IND: /* Lower layer disconnect indication */
return ("LOWER_LAYER_DISCONNECT_IND");
case L2CEVT_SEC_COMP: /* Security cleared successfully */
return ("SECURITY_COMPLETE");
case L2CEVT_SEC_COMP_NEG: /* Security procedure failed */
return ("SECURITY_COMPLETE_NEG");
case L2CEVT_L2CAP_CONNECT_REQ: /* Peer connection request */
return ("PEER_CONNECT_REQ");
case L2CEVT_L2CAP_CONNECT_RSP: /* Peer connection response */
return ("PEER_CONNECT_RSP");
case L2CEVT_L2CAP_CONNECT_RSP_PND: /* Peer connection response pending */
return ("PEER_CONNECT_RSP_PND");
case L2CEVT_L2CAP_CONNECT_RSP_NEG: /* Peer connection response (failed) */
return ("PEER_CONNECT_RSP_NEG");
case L2CEVT_L2CAP_CONFIG_REQ: /* Peer configuration request */
return ("PEER_CONFIG_REQ");
case L2CEVT_L2CAP_CONFIG_RSP: /* Peer configuration response */
return ("PEER_CONFIG_RSP");
case L2CEVT_L2CAP_CONFIG_RSP_NEG: /* Peer configuration response (failed) */
return ("PEER_CONFIG_RSP_NEG");
case L2CEVT_L2CAP_DISCONNECT_REQ: /* Peer disconnect request */
return ("PEER_DISCONNECT_REQ");
case L2CEVT_L2CAP_DISCONNECT_RSP: /* Peer disconnect response */
return ("PEER_DISCONNECT_RSP");
case L2CEVT_L2CAP_DATA: /* Peer data */
return ("PEER_DATA");
case L2CEVT_L2CA_CONNECT_REQ: /* Upper layer connect request */
return ("UPPER_LAYER_CONNECT_REQ");
case L2CEVT_L2CA_CONNECT_RSP: /* Upper layer connect response */
return ("UPPER_LAYER_CONNECT_RSP");
case L2CEVT_L2CA_CONNECT_RSP_NEG: /* Upper layer connect response (failed)*/
return ("UPPER_LAYER_CONNECT_RSP_NEG");
case L2CEVT_L2CA_CONFIG_REQ: /* Upper layer config request */
return ("UPPER_LAYER_CONFIG_REQ");
case L2CEVT_L2CA_CONFIG_RSP: /* Upper layer config response */
return ("UPPER_LAYER_CONFIG_RSP");
case L2CEVT_L2CA_DISCONNECT_REQ: /* Upper layer disconnect request */
return ("UPPER_LAYER_DISCONNECT_REQ");
case L2CEVT_L2CA_DISCONNECT_RSP: /* Upper layer disconnect response */
return ("UPPER_LAYER_DISCONNECT_RSP");
case L2CEVT_L2CA_DATA_READ: /* Upper layer data read */
return ("UPPER_LAYER_DATA_READ");
case L2CEVT_L2CA_DATA_WRITE: /* Upper layer data write */
return ("UPPER_LAYER_DATA_WRITE");
case L2CEVT_TIMEOUT: /* Timeout */
return ("TIMEOUT");
case L2CEVT_SEC_RE_SEND_CMD:
return ("SEC_RE_SEND_CMD");
case L2CEVT_L2CAP_INFO_RSP: /* Peer information response */
return ("L2CEVT_L2CAP_INFO_RSP");
case L2CEVT_ACK_TIMEOUT:
return ("L2CEVT_ACK_TIMEOUT");
case L2CEVT_L2CA_SEND_FLOW_CONTROL_CREDIT: /* Upper layer send credit packet
*/
return ("SEND_FLOW_CONTROL_CREDIT");
case L2CEVT_L2CA_CREDIT_BASED_CONNECT_REQ: /* Upper layer credit based
connect request */
return ("SEND_CREDIT_BASED_CONNECT_REQ");
case L2CEVT_L2CA_CREDIT_BASED_CONNECT_RSP: /* Upper layer credit based
connect response */
return ("SEND_CREDIT_BASED_CONNECT_RSP");
case L2CEVT_L2CA_CREDIT_BASED_RECONFIG_REQ: /* Upper layer credit based
reconfig request */
return ("SEND_CREDIT_BASED_RECONFIG_REQ");
case L2CEVT_L2CAP_RECV_FLOW_CONTROL_CREDIT: /* Peer send credit packet */
return ("RECV_FLOW_CONTROL_CREDIT");
case L2CEVT_L2CAP_CREDIT_BASED_CONNECT_REQ: /* Peer send credit based
connect request */
return ("RECV_CREDIT_BASED_CONNECT_REQ");
case L2CEVT_L2CAP_CREDIT_BASED_CONNECT_RSP: /* Peer send credit based
connect response */
return ("RECV_CREDIT_BASED_CONNECT_RSP");
case L2CEVT_L2CAP_CREDIT_BASED_CONNECT_RSP_NEG: /* Peer send reject credit
based connect response */
return ("RECV_CREDIT_BASED_CONNECT_RSP_NEG");
case L2CEVT_L2CAP_CREDIT_BASED_RECONFIG_REQ: /* Peer send credit based
reconfig request */
return ("RECV_CREDIT_BASED_RECONFIG_REQ");
case L2CEVT_L2CAP_CREDIT_BASED_RECONFIG_RSP: /* Peer send credit based
reconfig response */
return ("RECV_CREDIT_BASED_RECONFIG_RSP");
default:
return ("???? UNKNOWN EVENT");
}
}
/*******************************************************************************
*
* Function l2c_enqueue_peer_data
*
* Description Enqueues data destined for the peer in the ccb. Handles
* FCR segmentation and checks for congestion.
*
* Returns void
*
******************************************************************************/
void l2c_enqueue_peer_data(tL2C_CCB* p_ccb, BT_HDR* p_buf) {
CHECK(p_ccb != nullptr);
p_ccb->metrics.tx(p_buf->len);
uint8_t* p;
if (p_ccb->peer_cfg.fcr.mode != L2CAP_FCR_BASIC_MODE) {
p_buf->event = 0;
} else {
/* Save the channel ID for faster counting */
p_buf->event = p_ccb->local_cid;
/* Step back to add the L2CAP header */
p_buf->offset -= L2CAP_PKT_OVERHEAD;
p_buf->len += L2CAP_PKT_OVERHEAD;
/* Set the pointer to the beginning of the data */
p = (uint8_t*)(p_buf + 1) + p_buf->offset;
/* Now the L2CAP header */
UINT16_TO_STREAM(p, p_buf->len - L2CAP_PKT_OVERHEAD);
UINT16_TO_STREAM(p, p_ccb->remote_cid);
}
if (p_ccb->xmit_hold_q == NULL) {
LOG_ERROR(
"empty queue: p_ccb = %p p_ccb->in_use = %d p_ccb->chnl_state = %d "
"p_ccb->local_cid = %u p_ccb->remote_cid = %u",
p_ccb, p_ccb->in_use, p_ccb->chnl_state, p_ccb->local_cid,
p_ccb->remote_cid);
}
fixed_queue_enqueue(p_ccb->xmit_hold_q, p_buf);
l2cu_check_channel_congestion(p_ccb);
/* if new packet is higher priority than serving ccb and it is not overrun */
if ((p_ccb->p_lcb->rr_pri > p_ccb->ccb_priority) &&
(p_ccb->p_lcb->rr_serv[p_ccb->ccb_priority].quota > 0)) {
/* send out higher priority packet */
p_ccb->p_lcb->rr_pri = p_ccb->ccb_priority;
}
/* if we are doing a round robin scheduling, set the flag */
if (p_ccb->p_lcb->link_xmit_quota == 0) l2cb.check_round_robin = true;
}
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