/******************************************************************************
*
* 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 L2CAP interface functions
*
******************************************************************************/
#include <stddef.h>
#include "bt_target.h"
#include "bt_common.h"
#include "osi/include/osi.h"
#include "osi/include/time.h"
#include "bt_utils.h"
#include "l2c_api.h"
#include "l2cdefs.h"
#include "port_api.h"
#include "port_int.h"
#include "rfc_int.h"
#include "rfcdefs.h"
/*
* Define Callback functions to be called by L2CAP
*/
static void RFCOMM_ConnectInd(BD_ADDR bd_addr, uint16_t lcid, uint16_t psm,
uint8_t id);
static void RFCOMM_ConnectCnf(uint16_t lcid, uint16_t err);
static void RFCOMM_ConfigInd(uint16_t lcid, tL2CAP_CFG_INFO* p_cfg);
static void RFCOMM_ConfigCnf(uint16_t lcid, tL2CAP_CFG_INFO* p_cfg);
static void RFCOMM_DisconnectInd(uint16_t lcid, bool is_clear);
static void RFCOMM_QoSViolationInd(UNUSED_ATTR BD_ADDR bd_addr);
static void RFCOMM_BufDataInd(uint16_t lcid, BT_HDR* p_buf);
static void RFCOMM_CongestionStatusInd(uint16_t lcid, bool is_congested);
/*******************************************************************************
*
* Function rfcomm_l2cap_if_init
*
* Description This function is called during the RFCOMM task startup
* to register interface functions with L2CAP.
*
******************************************************************************/
void rfcomm_l2cap_if_init(void) {
tL2CAP_APPL_INFO* p_l2c = &rfc_cb.rfc.reg_info;
p_l2c->pL2CA_ConnectInd_Cb = RFCOMM_ConnectInd;
p_l2c->pL2CA_ConnectCfm_Cb = RFCOMM_ConnectCnf;
p_l2c->pL2CA_ConnectPnd_Cb = NULL;
p_l2c->pL2CA_ConfigInd_Cb = RFCOMM_ConfigInd;
p_l2c->pL2CA_ConfigCfm_Cb = RFCOMM_ConfigCnf;
p_l2c->pL2CA_DisconnectInd_Cb = RFCOMM_DisconnectInd;
p_l2c->pL2CA_DisconnectCfm_Cb = NULL;
p_l2c->pL2CA_QoSViolationInd_Cb = RFCOMM_QoSViolationInd;
p_l2c->pL2CA_DataInd_Cb = RFCOMM_BufDataInd;
p_l2c->pL2CA_CongestionStatus_Cb = RFCOMM_CongestionStatusInd;
p_l2c->pL2CA_TxComplete_Cb = NULL;
L2CA_Register(BT_PSM_RFCOMM, p_l2c);
}
/*******************************************************************************
*
* Function RFCOMM_ConnectInd
*
* Description This is a callback function called by L2CAP when
* L2CA_ConnectInd received. Allocate multiplexer control
* block and dispatch the event to it.
*
******************************************************************************/
void RFCOMM_ConnectInd(BD_ADDR bd_addr, uint16_t lcid, UNUSED_ATTR uint16_t psm,
uint8_t id) {
tRFC_MCB* p_mcb = rfc_alloc_multiplexer_channel(bd_addr, false);
if ((p_mcb) && (p_mcb->state != RFC_MX_STATE_IDLE)) {
/* if this is collision case */
if ((p_mcb->is_initiator) && (p_mcb->state == RFC_MX_STATE_WAIT_CONN_CNF)) {
p_mcb->pending_lcid = lcid;
p_mcb->pending_id = id;
/* wait random timeout (2 - 12) to resolve collision */
/* if peer gives up then local device rejects incoming connection and
* continues as initiator */
/* if timeout, local device disconnects outgoing connection and continues
* as acceptor */
RFCOMM_TRACE_DEBUG(
"RFCOMM_ConnectInd start timer for collision, initiator's "
"LCID(0x%x), acceptor's LCID(0x%x)",
p_mcb->lcid, p_mcb->pending_lcid);
rfc_timer_start(p_mcb, (uint16_t)(time_get_os_boottime_ms() % 10 + 2));
return;
} else {
/* we cannot accept connection request from peer at this state */
/* don't update lcid */
p_mcb = NULL;
}
} else {
/* store mcb even if null */
rfc_save_lcid_mcb(p_mcb, lcid);
}
if (p_mcb == NULL) {
L2CA_ConnectRsp(bd_addr, id, lcid, L2CAP_CONN_NO_RESOURCES, 0);
return;
}
p_mcb->lcid = lcid;
rfc_mx_sm_execute(p_mcb, RFC_MX_EVENT_CONN_IND, &id);
}
/*******************************************************************************
*
* Function RFCOMM_ConnectCnf
*
* Description This is a callback function called by L2CAP when
* L2CA_ConnectCnf received. Save L2CAP handle and dispatch
* event to the FSM.
*
******************************************************************************/
void RFCOMM_ConnectCnf(uint16_t lcid, uint16_t result) {
tRFC_MCB* p_mcb = rfc_find_lcid_mcb(lcid);
if (!p_mcb) {
RFCOMM_TRACE_ERROR("RFCOMM_ConnectCnf LCID:0x%x", lcid);
return;
}
if (p_mcb->pending_lcid) {
/* if peer rejects our connect request but peer's connect request is pending
*/
if (result != L2CAP_CONN_OK) {
uint16_t i;
uint8_t idx;
RFCOMM_TRACE_DEBUG(
"RFCOMM_ConnectCnf retry as acceptor on pending LCID(0x%x)",
p_mcb->pending_lcid);
/* remove mcb from mapping table */
rfc_save_lcid_mcb(NULL, p_mcb->lcid);
p_mcb->lcid = p_mcb->pending_lcid;
p_mcb->is_initiator = false;
p_mcb->state = RFC_MX_STATE_IDLE;
/* store mcb into mapping table */
rfc_save_lcid_mcb(p_mcb, p_mcb->lcid);
/* update direction bit */
for (i = 0; i < RFCOMM_MAX_DLCI; i += 2) {
idx = p_mcb->port_inx[i];
if (idx != 0) {
p_mcb->port_inx[i] = 0;
p_mcb->port_inx[i + 1] = idx;
rfc_cb.port.port[idx - 1].dlci += 1;
RFCOMM_TRACE_DEBUG("RFCOMM MX - DLCI:%d -> %d", i,
rfc_cb.port.port[idx - 1].dlci);
}
}
rfc_mx_sm_execute(p_mcb, RFC_MX_EVENT_CONN_IND, &(p_mcb->pending_id));
return;
} else {
RFCOMM_TRACE_DEBUG("RFCOMM_ConnectCnf peer gave up pending LCID(0x%x)",
p_mcb->pending_lcid);
/* Peer gave up his connection request, make sure cleaning up L2CAP
* channel */
L2CA_ConnectRsp(p_mcb->bd_addr, p_mcb->pending_id, p_mcb->pending_lcid,
L2CAP_CONN_NO_RESOURCES, 0);
p_mcb->pending_lcid = 0;
}
}
/* Save LCID to be used in all consecutive calls to L2CAP */
p_mcb->lcid = lcid;
rfc_mx_sm_execute(p_mcb, RFC_MX_EVENT_CONN_CNF, &result);
}
/*******************************************************************************
*
* Function RFCOMM_ConfigInd
*
* Description This is a callback function called by L2CAP when
* L2CA_ConfigInd received. Save parameters in the control
* block and dispatch event to the FSM.
*
******************************************************************************/
void RFCOMM_ConfigInd(uint16_t lcid, tL2CAP_CFG_INFO* p_cfg) {
tRFC_MCB* p_mcb = rfc_find_lcid_mcb(lcid);
if (!p_mcb) {
RFCOMM_TRACE_ERROR("RFCOMM_ConfigInd LCID:0x%x", lcid);
return;
}
rfc_mx_sm_execute(p_mcb, RFC_MX_EVENT_CONF_IND, (void*)p_cfg);
}
/*******************************************************************************
*
* Function RFCOMM_ConfigCnf
*
* Description This is a callback function called by L2CAP when
* L2CA_ConfigCnf received. Save L2CAP handle and dispatch
* event to the FSM.
*
******************************************************************************/
void RFCOMM_ConfigCnf(uint16_t lcid, tL2CAP_CFG_INFO* p_cfg) {
tRFC_MCB* p_mcb = rfc_find_lcid_mcb(lcid);
if (!p_mcb) {
RFCOMM_TRACE_ERROR("RFCOMM_ConfigCnf no MCB LCID:0x%x", lcid);
return;
}
rfc_mx_sm_execute(p_mcb, RFC_MX_EVENT_CONF_CNF, (void*)p_cfg);
}
/*******************************************************************************
*
* Function RFCOMM_QoSViolationInd
*
* Description This is a callback function called by L2CAP when
* L2CA_QoSViolationIndInd received. Dispatch event to the
* FSM.
*
******************************************************************************/
void RFCOMM_QoSViolationInd(UNUSED_ATTR BD_ADDR bd_addr) {}
/*******************************************************************************
*
* Function RFCOMM_DisconnectInd
*
* Description This is a callback function called by L2CAP when
* L2CA_DisconnectInd received. Dispatch event to the FSM.
*
******************************************************************************/
void RFCOMM_DisconnectInd(uint16_t lcid, bool is_conf_needed) {
tRFC_MCB* p_mcb = rfc_find_lcid_mcb(lcid);
if (is_conf_needed) {
L2CA_DisconnectRsp(lcid);
}
if (!p_mcb) {
RFCOMM_TRACE_WARNING("RFCOMM_DisconnectInd LCID:0x%x", lcid);
return;
}
rfc_mx_sm_execute(p_mcb, RFC_MX_EVENT_DISC_IND, NULL);
}
/*******************************************************************************
*
* Function RFCOMM_BufDataInd
*
* Description This is a callback function called by L2CAP when
* data RFCOMM frame is received. Parse the frames, check
* the checksum and dispatch event to multiplexer or port
* state machine depending on the frame destination.
*
******************************************************************************/
void RFCOMM_BufDataInd(uint16_t lcid, BT_HDR* p_buf) {
tRFC_MCB* p_mcb = rfc_find_lcid_mcb(lcid);
tPORT* p_port;
uint8_t event;
if (!p_mcb) {
RFCOMM_TRACE_WARNING("RFCOMM_BufDataInd LCID:0x%x", lcid);
osi_free(p_buf);
return;
}
event = rfc_parse_data(p_mcb, &rfc_cb.rfc.rx_frame, p_buf);
/* If the frame did not pass validation just ignore it */
if (event == RFC_EVENT_BAD_FRAME) {
osi_free(p_buf);
return;
}
if (rfc_cb.rfc.rx_frame.dlci == RFCOMM_MX_DLCI) {
/* Take special care of the Multiplexer Control Messages */
if (event == RFC_EVENT_UIH) {
rfc_process_mx_message(p_mcb, p_buf);
return;
}
/* Other multiplexer events go to state machine */
rfc_mx_sm_execute(p_mcb, event, NULL);
osi_free(p_buf);
return;
}
/* The frame was received on the data channel DLCI, verify that DLC exists */
if (((p_port = port_find_mcb_dlci_port(p_mcb, rfc_cb.rfc.rx_frame.dlci)) ==
NULL) ||
(!p_port->rfc.p_mcb)) {
/* If this is a SABME on the new port, check if any appl is waiting for it
*/
if (event != RFC_EVENT_SABME) {
if ((p_mcb->is_initiator && !rfc_cb.rfc.rx_frame.cr) ||
(!p_mcb->is_initiator && rfc_cb.rfc.rx_frame.cr))
rfc_send_dm(p_mcb, rfc_cb.rfc.rx_frame.dlci, rfc_cb.rfc.rx_frame.pf);
osi_free(p_buf);
return;
}
p_port = port_find_dlci_port(rfc_cb.rfc.rx_frame.dlci);
if (p_port == NULL) {
rfc_send_dm(p_mcb, rfc_cb.rfc.rx_frame.dlci, true);
osi_free(p_buf);
return;
}
p_mcb->port_inx[rfc_cb.rfc.rx_frame.dlci] = p_port->inx;
p_port->rfc.p_mcb = p_mcb;
}
if (event == RFC_EVENT_UIH) {
if (p_buf->len > 0)
rfc_port_sm_execute(p_port, event, p_buf);
else
osi_free(p_buf);
if (rfc_cb.rfc.rx_frame.credit != 0)
rfc_inc_credit(p_port, rfc_cb.rfc.rx_frame.credit);
return;
}
rfc_port_sm_execute(p_port, event, NULL);
osi_free(p_buf);
}
/*******************************************************************************
*
* Function RFCOMM_CongestionStatusInd
*
* Description This is a callback function called by L2CAP when
* data RFCOMM L2CAP congestion status changes
*
******************************************************************************/
void RFCOMM_CongestionStatusInd(uint16_t lcid, bool is_congested) {
tRFC_MCB* p_mcb = rfc_find_lcid_mcb(lcid);
if (!p_mcb) {
RFCOMM_TRACE_ERROR("RFCOMM_CongestionStatusInd dropped LCID:0x%x", lcid);
return;
} else {
RFCOMM_TRACE_EVENT("RFCOMM_CongestionStatusInd LCID:0x%x", lcid);
}
rfc_process_l2cap_congestion(p_mcb, is_congested);
}
/*******************************************************************************
*
* Function rfc_find_lcid_mcb
*
* Description This function returns MCB block supporting local cid
*
******************************************************************************/
tRFC_MCB* rfc_find_lcid_mcb(uint16_t lcid) {
tRFC_MCB* p_mcb;
if (lcid - L2CAP_BASE_APPL_CID >= MAX_L2CAP_CHANNELS) {
RFCOMM_TRACE_ERROR("rfc_find_lcid_mcb LCID:0x%x", lcid);
return (NULL);
} else {
p_mcb = rfc_cb.rfc.p_rfc_lcid_mcb[lcid - L2CAP_BASE_APPL_CID];
if (p_mcb != NULL) {
if (p_mcb->lcid != lcid) {
RFCOMM_TRACE_WARNING(
"rfc_find_lcid_mcb LCID reused LCID:0x%x current:0x%x", lcid,
p_mcb->lcid);
return (NULL);
}
}
}
return (p_mcb);
}
/*******************************************************************************
*
* Function rfc_save_lcid_mcb
*
* Description This function returns MCB block supporting local cid
*
******************************************************************************/
void rfc_save_lcid_mcb(tRFC_MCB* p_mcb, uint16_t lcid) {
if (lcid < L2CAP_BASE_APPL_CID) return;
rfc_cb.rfc.p_rfc_lcid_mcb[lcid - L2CAP_BASE_APPL_CID] = p_mcb;
}