/******************************************************************************
*
* Copyright 2002-2012 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 AVDTP adaption layer module interfaces to L2CAP
*
******************************************************************************/
#include <string.h>
#include "avdt_api.h"
#include "avdt_int.h"
#include "avdtc_api.h"
#include "bt_target.h"
#include "bt_types.h"
#include "bt_utils.h"
#include "bta/include/bta_av_api.h"
#include "btm_api.h"
#include "btm_int.h"
#include "device/include/interop.h"
#include "l2c_api.h"
#include "l2cdefs.h"
#include "osi/include/osi.h"
/* callback function declarations */
void avdt_l2c_connect_ind_cback(const RawAddress& bd_addr, uint16_t lcid,
uint16_t psm, uint8_t id);
void avdt_l2c_connect_cfm_cback(uint16_t lcid, uint16_t result);
void avdt_l2c_config_cfm_cback(uint16_t lcid, tL2CAP_CFG_INFO* p_cfg);
void avdt_l2c_config_ind_cback(uint16_t lcid, tL2CAP_CFG_INFO* p_cfg);
void avdt_l2c_disconnect_ind_cback(uint16_t lcid, bool ack_needed);
void avdt_l2c_disconnect_cfm_cback(uint16_t lcid, uint16_t result);
void avdt_l2c_congestion_ind_cback(uint16_t lcid, bool is_congested);
void avdt_l2c_data_ind_cback(uint16_t lcid, BT_HDR* p_buf);
/* L2CAP callback function structure */
const tL2CAP_APPL_INFO avdt_l2c_appl = {avdt_l2c_connect_ind_cback,
avdt_l2c_connect_cfm_cback,
NULL,
avdt_l2c_config_ind_cback,
avdt_l2c_config_cfm_cback,
avdt_l2c_disconnect_ind_cback,
avdt_l2c_disconnect_cfm_cback,
NULL,
avdt_l2c_data_ind_cback,
avdt_l2c_congestion_ind_cback,
NULL, /* tL2CA_TX_COMPLETE_CB */
NULL /* tL2CA_CREDITS_RECEIVED_CB */};
/*******************************************************************************
*
* Function avdt_sec_check_complete_term
*
* Description The function called when Security Manager finishes
* verification of the service side connection
*
* Returns void
*
******************************************************************************/
static void avdt_sec_check_complete_term(const RawAddress* bd_addr,
tBT_TRANSPORT transport,
UNUSED_ATTR void* p_ref_data,
uint8_t res) {
AvdtpCcb* p_ccb = NULL;
tL2CAP_CFG_INFO cfg;
AvdtpTransportChannel* p_tbl;
AVDT_TRACE_DEBUG("avdt_sec_check_complete_term res: %d", res);
p_ccb = avdt_ccb_by_bd(*bd_addr);
p_tbl = avdt_ad_tc_tbl_by_st(AVDT_CHAN_SIG, p_ccb, AVDT_AD_ST_SEC_ACP);
if (p_tbl == NULL) return;
if (res == BTM_SUCCESS) {
/* Send response to the L2CAP layer. */
L2CA_ConnectRsp(*bd_addr, p_tbl->id, p_tbl->lcid, L2CAP_CONN_OK,
L2CAP_CONN_OK);
/* store idx in LCID table, store LCID in routing table */
avdtp_cb.ad.lcid_tbl[p_tbl->lcid - L2CAP_BASE_APPL_CID] =
avdt_ad_tc_tbl_to_idx(p_tbl);
avdtp_cb.ad.rt_tbl[avdt_ccb_to_idx(p_ccb)][p_tbl->tcid].lcid = p_tbl->lcid;
/* transition to configuration state */
p_tbl->state = AVDT_AD_ST_CFG;
/* Send L2CAP config req */
memset(&cfg, 0, sizeof(tL2CAP_CFG_INFO));
cfg.mtu_present = true;
cfg.mtu = p_tbl->my_mtu;
cfg.flush_to_present = true;
cfg.flush_to = p_tbl->my_flush_to;
L2CA_ConfigReq(p_tbl->lcid, &cfg);
} else {
L2CA_ConnectRsp(*bd_addr, p_tbl->id, p_tbl->lcid, L2CAP_CONN_SECURITY_BLOCK,
L2CAP_CONN_OK);
avdt_ad_tc_close_ind(p_tbl, L2CAP_CONN_SECURITY_BLOCK);
}
}
/*******************************************************************************
*
* Function avdt_sec_check_complete_orig
*
* Description The function called when Security Manager finishes
* verification of the service side connection
*
* Returns void
*
******************************************************************************/
static void avdt_sec_check_complete_orig(const RawAddress* bd_addr,
tBT_TRANSPORT trasnport,
UNUSED_ATTR void* p_ref_data,
uint8_t res) {
AvdtpCcb* p_ccb = NULL;
tL2CAP_CFG_INFO cfg;
AvdtpTransportChannel* p_tbl;
AVDT_TRACE_DEBUG("avdt_sec_check_complete_orig res: %d", res);
if (bd_addr) p_ccb = avdt_ccb_by_bd(*bd_addr);
p_tbl = avdt_ad_tc_tbl_by_st(AVDT_CHAN_SIG, p_ccb, AVDT_AD_ST_SEC_INT);
if (p_tbl == NULL) return;
if (res == BTM_SUCCESS) {
/* set channel state */
p_tbl->state = AVDT_AD_ST_CFG;
/* Send L2CAP config req */
memset(&cfg, 0, sizeof(tL2CAP_CFG_INFO));
cfg.mtu_present = true;
cfg.mtu = p_tbl->my_mtu;
cfg.flush_to_present = true;
cfg.flush_to = p_tbl->my_flush_to;
L2CA_ConfigReq(p_tbl->lcid, &cfg);
} else {
L2CA_DisconnectReq(p_tbl->lcid);
avdt_ad_tc_close_ind(p_tbl, L2CAP_CONN_SECURITY_BLOCK);
}
}
/*******************************************************************************
*
* Function avdt_l2c_connect_ind_cback
*
* Description This is the L2CAP connect indication callback function.
*
*
* Returns void
*
******************************************************************************/
void avdt_l2c_connect_ind_cback(const RawAddress& bd_addr, uint16_t lcid,
UNUSED_ATTR uint16_t psm, uint8_t id) {
AvdtpCcb* p_ccb;
AvdtpTransportChannel* p_tbl = NULL;
uint16_t result;
tL2CAP_CFG_INFO cfg;
tBTM_STATUS rc;
/* do we already have a control channel for this peer? */
p_ccb = avdt_ccb_by_bd(bd_addr);
if (p_ccb == NULL) {
/* no, allocate ccb */
int channel_index = BTA_AvObtainPeerChannelIndex(bd_addr);
if (channel_index >= 0) {
p_ccb = avdt_ccb_alloc_by_channel_index(bd_addr, channel_index);
}
if (p_ccb == nullptr) {
p_ccb = avdt_ccb_alloc(bd_addr);
}
if (p_ccb == NULL) {
/* no ccb available, reject L2CAP connection */
result = L2CAP_CONN_NO_RESOURCES;
} else {
/* allocate and set up entry; first channel is always signaling */
p_tbl = avdt_ad_tc_tbl_alloc(p_ccb);
p_tbl->my_mtu = avdtp_cb.rcb.ctrl_mtu;
p_tbl->my_flush_to = L2CAP_DEFAULT_FLUSH_TO;
p_tbl->tcid = AVDT_CHAN_SIG;
p_tbl->lcid = lcid;
p_tbl->id = id;
p_tbl->state = AVDT_AD_ST_SEC_ACP;
p_tbl->cfg_flags = AVDT_L2C_CFG_CONN_ACP;
if (interop_match_addr(INTEROP_2MBPS_LINK_ONLY, &bd_addr)) {
// Disable 3DH packets for AVDT ACL to improve sensitivity on HS
tACL_CONN* p_acl_cb = btm_bda_to_acl(bd_addr, BT_TRANSPORT_BR_EDR);
btm_set_packet_types(
p_acl_cb,
(btm_cb.btm_acl_pkt_types_supported | HCI_PKT_TYPES_MASK_NO_3_DH1 |
HCI_PKT_TYPES_MASK_NO_3_DH3 | HCI_PKT_TYPES_MASK_NO_3_DH5));
}
/* Check the security */
rc = btm_sec_mx_access_request(bd_addr, AVDT_PSM, false,
BTM_SEC_PROTO_AVDT, AVDT_CHAN_SIG,
&avdt_sec_check_complete_term, NULL);
if (rc == BTM_CMD_STARTED) {
L2CA_ConnectRsp(p_ccb->peer_addr, p_tbl->id, lcid, L2CAP_CONN_PENDING,
L2CAP_CONN_OK);
}
return;
}
} else {
/* deal with simultaneous control channel connect case */
p_tbl = avdt_ad_tc_tbl_by_st(AVDT_CHAN_SIG, p_ccb, AVDT_AD_ST_CONN);
if (p_tbl != NULL) {
/* reject their connection */
result = L2CAP_CONN_NO_RESOURCES;
} else {
/* This must be a traffic channel; are we accepting a traffic channel
* for this ccb?
*/
p_tbl = avdt_ad_tc_tbl_by_st(AVDT_CHAN_MEDIA, p_ccb, AVDT_AD_ST_ACP);
if (p_tbl != NULL) {
/* yes; proceed with connection */
result = L2CAP_CONN_OK;
} else {
/* this must be a reporting channel; are we accepting a reporting
* channel for this ccb?
*/
p_tbl = avdt_ad_tc_tbl_by_st(AVDT_CHAN_REPORT, p_ccb, AVDT_AD_ST_ACP);
if (p_tbl != NULL) {
/* yes; proceed with connection */
result = L2CAP_CONN_OK;
} else {
/* else we're not listening for traffic channel; reject */
result = L2CAP_CONN_NO_PSM;
}
}
}
}
/* Send L2CAP connect rsp */
L2CA_ConnectRsp(bd_addr, id, lcid, result, 0);
/* if result ok, proceed with connection */
if (result == L2CAP_CONN_OK) {
/* store idx in LCID table, store LCID in routing table */
avdtp_cb.ad.lcid_tbl[lcid - L2CAP_BASE_APPL_CID] =
avdt_ad_tc_tbl_to_idx(p_tbl);
avdtp_cb.ad.rt_tbl[avdt_ccb_to_idx(p_ccb)][p_tbl->tcid].lcid = lcid;
/* transition to configuration state */
p_tbl->state = AVDT_AD_ST_CFG;
/* Send L2CAP config req */
memset(&cfg, 0, sizeof(tL2CAP_CFG_INFO));
cfg.mtu_present = true;
cfg.mtu = p_tbl->my_mtu;
cfg.flush_to_present = true;
cfg.flush_to = p_tbl->my_flush_to;
L2CA_ConfigReq(lcid, &cfg);
}
}
/*******************************************************************************
*
* Function avdt_l2c_connect_cfm_cback
*
* Description This is the L2CAP connect confirm callback function.
*
*
* Returns void
*
******************************************************************************/
void avdt_l2c_connect_cfm_cback(uint16_t lcid, uint16_t result) {
AvdtpTransportChannel* p_tbl;
tL2CAP_CFG_INFO cfg;
AvdtpCcb* p_ccb;
AVDT_TRACE_DEBUG("avdt_l2c_connect_cfm_cback lcid: %d, result: %d", lcid,
result);
/* look up info for this channel */
p_tbl = avdt_ad_tc_tbl_by_lcid(lcid);
if (p_tbl != NULL) {
/* if in correct state */
if (p_tbl->state == AVDT_AD_ST_CONN) {
/* if result successful */
if (result == L2CAP_CONN_OK) {
if (p_tbl->tcid != AVDT_CHAN_SIG) {
/* set channel state */
p_tbl->state = AVDT_AD_ST_CFG;
/* Send L2CAP config req */
memset(&cfg, 0, sizeof(tL2CAP_CFG_INFO));
cfg.mtu_present = true;
cfg.mtu = p_tbl->my_mtu;
cfg.flush_to_present = true;
cfg.flush_to = p_tbl->my_flush_to;
L2CA_ConfigReq(lcid, &cfg);
} else {
p_ccb = avdt_ccb_by_idx(p_tbl->ccb_idx);
if (p_ccb == NULL) {
result = L2CAP_CONN_NO_RESOURCES;
} else {
/* set channel state */
p_tbl->state = AVDT_AD_ST_SEC_INT;
p_tbl->lcid = lcid;
p_tbl->cfg_flags = AVDT_L2C_CFG_CONN_INT;
if (interop_match_addr(INTEROP_2MBPS_LINK_ONLY,
(const RawAddress*)&p_ccb->peer_addr)) {
// Disable 3DH packets for AVDT ACL to improve sensitivity on HS
tACL_CONN* p_acl_cb =
btm_bda_to_acl(p_ccb->peer_addr, BT_TRANSPORT_BR_EDR);
btm_set_packet_types(
p_acl_cb,
(btm_cb.btm_acl_pkt_types_supported |
HCI_PKT_TYPES_MASK_NO_3_DH1 | HCI_PKT_TYPES_MASK_NO_3_DH3 |
HCI_PKT_TYPES_MASK_NO_3_DH5));
}
/* Check the security */
btm_sec_mx_access_request(p_ccb->peer_addr, AVDT_PSM, true,
BTM_SEC_PROTO_AVDT, AVDT_CHAN_SIG,
&avdt_sec_check_complete_orig, NULL);
}
}
}
/* failure; notify adaption that channel closed */
if (result != L2CAP_CONN_OK) {
avdt_ad_tc_close_ind(p_tbl, result);
}
}
}
}
/*******************************************************************************
*
* Function avdt_l2c_config_cfm_cback
*
* Description This is the L2CAP config confirm callback function.
*
*
* Returns void
*
******************************************************************************/
void avdt_l2c_config_cfm_cback(uint16_t lcid, tL2CAP_CFG_INFO* p_cfg) {
AvdtpTransportChannel* p_tbl;
AVDT_TRACE_DEBUG("%s: lcid: %d", __func__, lcid);
/* look up info for this channel */
p_tbl = avdt_ad_tc_tbl_by_lcid(lcid);
if (p_tbl != NULL) {
p_tbl->lcid = lcid;
/* if in correct state */
if (p_tbl->state == AVDT_AD_ST_CFG) {
/* if result successful */
if (p_cfg->result == L2CAP_CONN_OK) {
/* update cfg_flags */
p_tbl->cfg_flags |= AVDT_L2C_CFG_CFM_DONE;
/* if configuration complete */
if (p_tbl->cfg_flags & AVDT_L2C_CFG_IND_DONE) {
avdt_ad_tc_open_ind(p_tbl);
}
}
/* else failure */
else {
/* Send L2CAP disconnect req */
L2CA_DisconnectReq(lcid);
}
}
}
}
/*******************************************************************************
*
* Function avdt_l2c_config_ind_cback
*
* Description This is the L2CAP config indication callback function.
*
*
* Returns void
*
******************************************************************************/
void avdt_l2c_config_ind_cback(uint16_t lcid, tL2CAP_CFG_INFO* p_cfg) {
AvdtpTransportChannel* p_tbl;
AVDT_TRACE_DEBUG("%s: lcid: %d", __func__, lcid);
/* look up info for this channel */
p_tbl = avdt_ad_tc_tbl_by_lcid(lcid);
if (p_tbl != NULL) {
/* store the mtu in tbl */
if (p_cfg->mtu_present) {
p_tbl->peer_mtu = p_cfg->mtu;
} else {
p_tbl->peer_mtu = L2CAP_DEFAULT_MTU;
}
AVDT_TRACE_DEBUG("%s: peer_mtu: %d, lcid: %d", __func__, p_tbl->peer_mtu,
lcid);
/* send L2CAP configure response */
memset(p_cfg, 0, sizeof(tL2CAP_CFG_INFO));
p_cfg->result = L2CAP_CFG_OK;
L2CA_ConfigRsp(lcid, p_cfg);
/* if first config ind */
if ((p_tbl->cfg_flags & AVDT_L2C_CFG_IND_DONE) == 0) {
/* update cfg_flags */
p_tbl->cfg_flags |= AVDT_L2C_CFG_IND_DONE;
/* if configuration complete */
if (p_tbl->cfg_flags & AVDT_L2C_CFG_CFM_DONE) {
avdt_ad_tc_open_ind(p_tbl);
}
}
}
}
/*******************************************************************************
*
* Function avdt_l2c_disconnect_ind_cback
*
* Description This is the L2CAP disconnect indication callback function.
*
*
* Returns void
*
******************************************************************************/
void avdt_l2c_disconnect_ind_cback(uint16_t lcid, bool ack_needed) {
AvdtpTransportChannel* p_tbl;
AVDT_TRACE_DEBUG("avdt_l2c_disconnect_ind_cback lcid: %d, ack_needed: %d",
lcid, ack_needed);
/* look up info for this channel */
p_tbl = avdt_ad_tc_tbl_by_lcid(lcid);
if (p_tbl != NULL) {
if (ack_needed) {
/* send L2CAP disconnect response */
L2CA_DisconnectRsp(lcid);
}
avdt_ad_tc_close_ind(p_tbl, 0);
}
}
/*******************************************************************************
*
* Function avdt_l2c_disconnect_cfm_cback
*
* Description This is the L2CAP disconnect confirm callback function.
*
*
* Returns void
*
******************************************************************************/
void avdt_l2c_disconnect_cfm_cback(uint16_t lcid, uint16_t result) {
AvdtpTransportChannel* p_tbl;
AVDT_TRACE_DEBUG("avdt_l2c_disconnect_cfm_cback lcid: %d, result: %d", lcid,
result);
/* look up info for this channel */
p_tbl = avdt_ad_tc_tbl_by_lcid(lcid);
if (p_tbl != NULL) {
avdt_ad_tc_close_ind(p_tbl, result);
}
}
/*******************************************************************************
*
* Function avdt_l2c_congestion_ind_cback
*
* Description This is the L2CAP congestion indication callback function.
*
*
* Returns void
*
******************************************************************************/
void avdt_l2c_congestion_ind_cback(uint16_t lcid, bool is_congested) {
AvdtpTransportChannel* p_tbl;
/* look up info for this channel */
p_tbl = avdt_ad_tc_tbl_by_lcid(lcid);
if (p_tbl != NULL) {
avdt_ad_tc_cong_ind(p_tbl, is_congested);
}
}
/*******************************************************************************
*
* Function avdt_l2c_data_ind_cback
*
* Description This is the L2CAP data indication callback function.
*
*
* Returns void
*
******************************************************************************/
void avdt_l2c_data_ind_cback(uint16_t lcid, BT_HDR* p_buf) {
AvdtpTransportChannel* p_tbl;
/* look up info for this channel */
p_tbl = avdt_ad_tc_tbl_by_lcid(lcid);
if (p_tbl != NULL) {
avdt_ad_tc_data_ind(p_tbl, p_buf);
} else /* prevent buffer leak */
osi_free(p_buf);
}