/******************************************************************************
*
* 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 collection of utility functions used the RFCOMM unit
*
*****************************************************************************/
#include "bt_common.h"
#include "bt_target.h"
#include "bt_utils.h"
#include "btm_api.h"
#include "btm_int.h"
#include "btu.h"
#include "osi/include/osi.h"
#include "port_api.h"
#include "port_ext.h"
#include "port_int.h"
#include "rfc_int.h"
#include "rfcdefs.h"
#include <string.h>
/*******************************************************************************
*
* Function rfc_calc_fcs
*
* Description Reversed CRC Table , 8-bit, poly=0x07
* (GSM 07.10 TS 101 369 V6.3.0)
******************************************************************************/
static const uint8_t rfc_crctable[] = {
0x00, 0x91, 0xE3, 0x72, 0x07, 0x96, 0xE4, 0x75, 0x0E, 0x9F, 0xED,
0x7C, 0x09, 0x98, 0xEA, 0x7B, 0x1C, 0x8D, 0xFF, 0x6E, 0x1B, 0x8A,
0xF8, 0x69, 0x12, 0x83, 0xF1, 0x60, 0x15, 0x84, 0xF6, 0x67, 0x38,
0xA9, 0xDB, 0x4A, 0x3F, 0xAE, 0xDC, 0x4D, 0x36, 0xA7, 0xD5, 0x44,
0x31, 0xA0, 0xD2, 0x43, 0x24, 0xB5, 0xC7, 0x56, 0x23, 0xB2, 0xC0,
0x51, 0x2A, 0xBB, 0xC9, 0x58, 0x2D, 0xBC, 0xCE, 0x5F,
0x70, 0xE1, 0x93, 0x02, 0x77, 0xE6, 0x94, 0x05, 0x7E, 0xEF, 0x9D,
0x0C, 0x79, 0xE8, 0x9A, 0x0B, 0x6C, 0xFD, 0x8F, 0x1E, 0x6B, 0xFA,
0x88, 0x19, 0x62, 0xF3, 0x81, 0x10, 0x65, 0xF4, 0x86, 0x17, 0x48,
0xD9, 0xAB, 0x3A, 0x4F, 0xDE, 0xAC, 0x3D, 0x46, 0xD7, 0xA5, 0x34,
0x41, 0xD0, 0xA2, 0x33, 0x54, 0xC5, 0xB7, 0x26, 0x53, 0xC2, 0xB0,
0x21, 0x5A, 0xCB, 0xB9, 0x28, 0x5D, 0xCC, 0xBE, 0x2F,
0xE0, 0x71, 0x03, 0x92, 0xE7, 0x76, 0x04, 0x95, 0xEE, 0x7F, 0x0D,
0x9C, 0xE9, 0x78, 0x0A, 0x9B, 0xFC, 0x6D, 0x1F, 0x8E, 0xFB, 0x6A,
0x18, 0x89, 0xF2, 0x63, 0x11, 0x80, 0xF5, 0x64, 0x16, 0x87, 0xD8,
0x49, 0x3B, 0xAA, 0xDF, 0x4E, 0x3C, 0xAD, 0xD6, 0x47, 0x35, 0xA4,
0xD1, 0x40, 0x32, 0xA3, 0xC4, 0x55, 0x27, 0xB6, 0xC3, 0x52, 0x20,
0xB1, 0xCA, 0x5B, 0x29, 0xB8, 0xCD, 0x5C, 0x2E, 0xBF,
0x90, 0x01, 0x73, 0xE2, 0x97, 0x06, 0x74, 0xE5, 0x9E, 0x0F, 0x7D,
0xEC, 0x99, 0x08, 0x7A, 0xEB, 0x8C, 0x1D, 0x6F, 0xFE, 0x8B, 0x1A,
0x68, 0xF9, 0x82, 0x13, 0x61, 0xF0, 0x85, 0x14, 0x66, 0xF7, 0xA8,
0x39, 0x4B, 0xDA, 0xAF, 0x3E, 0x4C, 0xDD, 0xA6, 0x37, 0x45, 0xD4,
0xA1, 0x30, 0x42, 0xD3, 0xB4, 0x25, 0x57, 0xC6, 0xB3, 0x22, 0x50,
0xC1, 0xBA, 0x2B, 0x59, 0xC8, 0xBD, 0x2C, 0x5E, 0xCF};
/*******************************************************************************
*
* Function rfc_calc_fcs
*
* Description This function calculate FCS for the RFCOMM frame
* (GSM 07.10 TS 101 369 V6.3.0)
*
* Input len - number of bytes in the message
* p - points to message
*
******************************************************************************/
uint8_t rfc_calc_fcs(uint16_t len, uint8_t* p) {
uint8_t fcs = 0xFF;
while (len--) {
fcs = rfc_crctable[fcs ^ *p++];
}
/* Ones compliment */
return (0xFF - fcs);
}
/*******************************************************************************
*
* Function rfc_check_fcs
*
* Description This function checks FCS for the RFCOMM frame
* (GSM 07.10 TS 101 369 V6.3.0)
*
* Input len - number of bytes in the message
* p - points to message
* received_fcs - received FCS
*
******************************************************************************/
bool rfc_check_fcs(uint16_t len, uint8_t* p, uint8_t received_fcs) {
uint8_t fcs = 0xFF;
while (len--) {
fcs = rfc_crctable[fcs ^ *p++];
}
/* Ones compliment */
fcs = rfc_crctable[fcs ^ received_fcs];
/*0xCF is the reversed order of 11110011.*/
return (fcs == 0xCF);
}
/*******************************************************************************
*
* Function rfc_alloc_multiplexer_channel
*
* Description This function returns existing or new control block for
* the address.
*
******************************************************************************/
tRFC_MCB* rfc_alloc_multiplexer_channel(const RawAddress& bd_addr,
bool is_initiator) {
int i, j;
tRFC_MCB* p_mcb = NULL;
VLOG(1) << __func__ << ": bd_addr:" << bd_addr;
RFCOMM_TRACE_DEBUG("rfc_alloc_multiplexer_channel:is_initiator:%d",
is_initiator);
for (i = 0; i < MAX_BD_CONNECTIONS; i++) {
RFCOMM_TRACE_DEBUG(
"rfc_alloc_multiplexer_channel rfc_cb.port.rfc_mcb[%d].state:%d", i,
rfc_cb.port.rfc_mcb[i].state);
VLOG(1) << "(rfc_cb.port.rfc_mcb[i].bd_addr:"
<< rfc_cb.port.rfc_mcb[i].bd_addr;
if ((rfc_cb.port.rfc_mcb[i].state != RFC_MX_STATE_IDLE) &&
rfc_cb.port.rfc_mcb[i].bd_addr == bd_addr) {
/* Multiplexer channel found do not change anything */
/* If there was an inactivity timer running stop it now */
if (rfc_cb.port.rfc_mcb[i].state == RFC_MX_STATE_CONNECTED)
rfc_timer_stop(&rfc_cb.port.rfc_mcb[i]);
RFCOMM_TRACE_DEBUG(
"rfc_alloc_multiplexer_channel:is_initiator:%d, found, state:%d, "
"p_mcb:%p",
is_initiator, rfc_cb.port.rfc_mcb[i].state, &rfc_cb.port.rfc_mcb[i]);
return (&rfc_cb.port.rfc_mcb[i]);
}
}
/* connection with bd_addr does not exist */
for (i = 0, j = rfc_cb.rfc.last_mux + 1; i < MAX_BD_CONNECTIONS; i++, j++) {
if (j >= MAX_BD_CONNECTIONS) j = 0;
p_mcb = &rfc_cb.port.rfc_mcb[j];
if (rfc_cb.port.rfc_mcb[j].state == RFC_MX_STATE_IDLE) {
/* New multiplexer control block */
alarm_free(p_mcb->mcb_timer);
fixed_queue_free(p_mcb->cmd_q, NULL);
memset(p_mcb, 0, sizeof(tRFC_MCB));
p_mcb->bd_addr = bd_addr;
RFCOMM_TRACE_DEBUG(
"rfc_alloc_multiplexer_channel:is_initiator:%d, create new p_mcb:%p, "
"index:%d",
is_initiator, &rfc_cb.port.rfc_mcb[j], j);
p_mcb->mcb_timer = alarm_new("rfcomm_mcb.mcb_timer");
p_mcb->cmd_q = fixed_queue_new(SIZE_MAX);
p_mcb->is_initiator = is_initiator;
rfc_timer_start(p_mcb, RFC_MCB_INIT_INACT_TIMER);
rfc_cb.rfc.last_mux = (uint8_t)j;
return (p_mcb);
}
}
return (NULL);
}
/*******************************************************************************
*
* Function rfc_release_multiplexer_channel
*
* Description Release a multiplexer control block
*
******************************************************************************/
void rfc_release_multiplexer_channel(tRFC_MCB* p_mcb) {
/* Remove the MCB from the mapping table */
rfc_save_lcid_mcb(NULL, p_mcb->lcid);
/* Remove the MCB from the ports */
for (int i = 0; i < MAX_RFC_PORTS; i++) {
if (rfc_cb.port.port[i].rfc.p_mcb == p_mcb)
rfc_cb.port.port[i].rfc.p_mcb = NULL;
}
rfc_timer_stop(p_mcb);
alarm_free(p_mcb->mcb_timer);
fixed_queue_free(p_mcb->cmd_q, osi_free);
memset(p_mcb, 0, sizeof(tRFC_MCB));
p_mcb->state = RFC_MX_STATE_IDLE;
}
/*******************************************************************************
*
* Function rfc_timer_start
*
* Description Start RFC Timer
*
******************************************************************************/
void rfc_timer_start(tRFC_MCB* p_mcb, uint16_t timeout) {
RFCOMM_TRACE_EVENT("%s - timeout:%d seconds", __func__, timeout);
uint64_t interval_ms = timeout * 1000;
alarm_set_on_mloop(p_mcb->mcb_timer, interval_ms, rfcomm_mcb_timer_timeout,
p_mcb);
}
/*******************************************************************************
*
* Function rfc_timer_stop
*
* Description Stop RFC Timer
*
******************************************************************************/
void rfc_timer_stop(tRFC_MCB* p_mcb) {
RFCOMM_TRACE_EVENT("%s", __func__);
alarm_cancel(p_mcb->mcb_timer);
}
/*******************************************************************************
*
* Function rfc_port_timer_start
*
* Description Start RFC Timer
*
******************************************************************************/
void rfc_port_timer_start(tPORT* p_port, uint16_t timeout) {
RFCOMM_TRACE_EVENT("%s - timeout:%d seconds", __func__, timeout);
uint64_t interval_ms = timeout * 1000;
alarm_set_on_mloop(p_port->rfc.port_timer, interval_ms,
rfcomm_port_timer_timeout, p_port);
}
/*******************************************************************************
*
* Function rfc_port_timer_stop
*
* Description Stop RFC Timer
*
******************************************************************************/
void rfc_port_timer_stop(tPORT* p_port) {
RFCOMM_TRACE_EVENT("%s", __func__);
alarm_cancel(p_port->rfc.port_timer);
}
/*******************************************************************************
*
* Function rfc_check_mcb_active
*
* Description Check if there are any opened ports on the MCB if not
* start MCB Inact timer.
*
* Returns void
*
******************************************************************************/
void rfc_check_mcb_active(tRFC_MCB* p_mcb) {
uint16_t i;
for (i = 0; i < RFCOMM_MAX_DLCI; i++) {
if (p_mcb->port_handles[i] != 0) {
p_mcb->is_disc_initiator = false;
return;
}
}
/* The last port was DISCed. On the client side start disconnecting Mx */
/* On the server side start inactivity timer */
if (p_mcb->is_disc_initiator) {
p_mcb->is_disc_initiator = false;
rfc_mx_sm_execute(p_mcb, RFC_MX_EVENT_CLOSE_REQ, NULL);
} else
rfc_timer_start(p_mcb, RFC_MCB_RELEASE_INACT_TIMER);
}
void rfcomm_port_timer_timeout(void* data) {
tPORT* p_port = (tPORT*)data;
rfc_port_sm_execute(p_port, RFC_EVENT_TIMEOUT, NULL);
}
void rfcomm_mcb_timer_timeout(void* data) {
tRFC_MCB* p_mcb = (tRFC_MCB*)data;
rfc_mx_sm_execute(p_mcb, RFC_EVENT_TIMEOUT, NULL);
}
/*******************************************************************************
*
* Function rfc_sec_check_complete
*
* Description The function called when Security Manager finishes
* verification of the service side connection
*
* Returns void
*
******************************************************************************/
void rfc_sec_check_complete(UNUSED_ATTR const RawAddress* bd_addr,
UNUSED_ATTR tBT_TRANSPORT transport,
void* p_ref_data, uint8_t res) {
tPORT* p_port = (tPORT*)p_ref_data;
/* Verify that PORT is still waiting for Security to complete */
if (!p_port->in_use ||
((p_port->rfc.state != RFC_STATE_ORIG_WAIT_SEC_CHECK) &&
(p_port->rfc.state != RFC_STATE_TERM_WAIT_SEC_CHECK)))
return;
rfc_port_sm_execute((tPORT*)p_ref_data, RFC_EVENT_SEC_COMPLETE, &res);
}
/*******************************************************************************
*
* Function rfc_port_closed
*
* Description The function is called when port is released based on the
* event received from the lower layer, typically L2CAP
* connection down, DISC, or DM frame.
*
* Returns void
*
******************************************************************************/
void rfc_port_closed(tPORT* p_port) {
tRFC_MCB* p_mcb = p_port->rfc.p_mcb;
rfc_port_timer_stop(p_port);
p_port->rfc.state = RFC_STATE_CLOSED;
/* If multiplexer channel was up mark it as down */
if (p_mcb) {
p_mcb->port_handles[p_port->dlci] = 0;
/* If there are no more ports opened on this MCB release it */
rfc_check_mcb_active(p_mcb);
}
/* Notify port that RFC connection is gone */
port_rfc_closed(p_port, PORT_CLOSED);
}
/*******************************************************************************
*
* Function rfc_inc_credit
*
* Description The function is called when a credit is received in a UIH
* frame. It increments the TX credit count, and if data
* flow had halted, it restarts it.
*
* Returns void
*
******************************************************************************/
void rfc_inc_credit(tPORT* p_port, uint8_t credit) {
if (p_port->rfc.p_mcb->flow == PORT_FC_CREDIT) {
p_port->credit_tx += credit;
RFCOMM_TRACE_EVENT("rfc_inc_credit:%d", p_port->credit_tx);
if (p_port->tx.peer_fc) PORT_FlowInd(p_port->rfc.p_mcb, p_port->dlci, true);
}
}
/*******************************************************************************
*
* Function rfc_dec_credit
*
* Description The function is called when a UIH frame of user data is
* sent. It decrements the credit count. If credit count
* Reaches zero, peer_fc is set.
*
* Returns void
*
******************************************************************************/
void rfc_dec_credit(tPORT* p_port) {
if (p_port->rfc.p_mcb->flow == PORT_FC_CREDIT) {
if (p_port->credit_tx > 0) p_port->credit_tx--;
if (p_port->credit_tx == 0) p_port->tx.peer_fc = true;
}
}
/*******************************************************************************
*
* Function rfc_check_send_cmd
*
* Description This function is called to send an RFCOMM command message
* or to handle the RFCOMM command message queue.
*
* Returns void
*
******************************************************************************/
void rfc_check_send_cmd(tRFC_MCB* p_mcb, BT_HDR* p_buf) {
/* if passed a buffer queue it */
if (p_buf != NULL) {
if (p_mcb->cmd_q == NULL) {
RFCOMM_TRACE_ERROR(
"%s: empty queue: p_mcb = %p p_mcb->lcid = %u cached p_mcb = %p",
__func__, p_mcb, p_mcb->lcid, rfc_find_lcid_mcb(p_mcb->lcid));
}
fixed_queue_enqueue(p_mcb->cmd_q, p_buf);
}
/* handle queue if L2CAP not congested */
while (!p_mcb->l2cap_congested) {
BT_HDR* p = (BT_HDR*)fixed_queue_try_dequeue(p_mcb->cmd_q);
if (p == NULL) break;
L2CA_DataWrite(p_mcb->lcid, p);
}
}