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PL286/system/bt/stack/rfcomm/rfc_ts_frames.cc

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/******************************************************************************
*
* 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 functions to send TS 07.10 frames
*
******************************************************************************/
#include <stddef.h>
#include "bt_common.h"
#include "bt_target.h"
#include "l2c_api.h"
#include "log/log.h"
#include "port_api.h"
#include "port_int.h"
#include "rfc_int.h"
#include "rfcdefs.h"
/*******************************************************************************
*
* Function rfc_send_sabme
*
* Description This function sends SABME frame.
*
******************************************************************************/
void rfc_send_sabme(tRFC_MCB* p_mcb, uint8_t dlci) {
uint8_t* p_data;
uint8_t cr = RFCOMM_CR(p_mcb->is_initiator, true);
BT_HDR* p_buf = (BT_HDR*)osi_malloc(RFCOMM_CMD_BUF_SIZE);
p_buf->offset = L2CAP_MIN_OFFSET;
p_data = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
/* SABME frame, command, PF = 1, dlci */
*p_data++ = RFCOMM_EA | cr | (dlci << RFCOMM_SHIFT_DLCI);
*p_data++ = RFCOMM_SABME | RFCOMM_PF;
*p_data++ = RFCOMM_EA | 0;
*p_data =
RFCOMM_SABME_FCS((uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET, cr, dlci);
p_buf->len = 4;
rfc_check_send_cmd(p_mcb, p_buf);
}
/*******************************************************************************
*
* Function rfc_send_ua
*
* Description This function sends UA frame.
*
******************************************************************************/
void rfc_send_ua(tRFC_MCB* p_mcb, uint8_t dlci) {
uint8_t* p_data;
uint8_t cr = RFCOMM_CR(p_mcb->is_initiator, false);
BT_HDR* p_buf = (BT_HDR*)osi_malloc(RFCOMM_CMD_BUF_SIZE);
p_buf->offset = L2CAP_MIN_OFFSET;
p_data = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
/* ua frame, response, PF = 1, dlci */
*p_data++ = RFCOMM_EA | cr | (dlci << RFCOMM_SHIFT_DLCI);
*p_data++ = RFCOMM_UA | RFCOMM_PF;
*p_data++ = RFCOMM_EA | 0;
*p_data = RFCOMM_UA_FCS((uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET, cr, dlci);
p_buf->len = 4;
rfc_check_send_cmd(p_mcb, p_buf);
}
/*******************************************************************************
*
* Function rfc_send_dm
*
* Description This function sends DM frame.
*
******************************************************************************/
void rfc_send_dm(tRFC_MCB* p_mcb, uint8_t dlci, bool pf) {
uint8_t* p_data;
uint8_t cr = RFCOMM_CR(p_mcb->is_initiator, false);
BT_HDR* p_buf = (BT_HDR*)osi_malloc(RFCOMM_CMD_BUF_SIZE);
p_buf->offset = L2CAP_MIN_OFFSET;
p_data = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
/* DM frame, response, PF = 1, dlci */
*p_data++ = RFCOMM_EA | cr | (dlci << RFCOMM_SHIFT_DLCI);
*p_data++ = RFCOMM_DM | ((pf) ? RFCOMM_PF : 0);
*p_data++ = RFCOMM_EA | 0;
*p_data = RFCOMM_DM_FCS((uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET, cr, dlci);
p_buf->len = 4;
rfc_check_send_cmd(p_mcb, p_buf);
}
/*******************************************************************************
*
* Function rfc_send_disc
*
* Description This function sends DISC frame.
*
******************************************************************************/
void rfc_send_disc(tRFC_MCB* p_mcb, uint8_t dlci) {
uint8_t* p_data;
uint8_t cr = RFCOMM_CR(p_mcb->is_initiator, true);
BT_HDR* p_buf = (BT_HDR*)osi_malloc(RFCOMM_CMD_BUF_SIZE);
p_buf->offset = L2CAP_MIN_OFFSET;
p_data = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
/* DISC frame, command, PF = 1, dlci */
*p_data++ = RFCOMM_EA | cr | (dlci << RFCOMM_SHIFT_DLCI);
*p_data++ = RFCOMM_DISC | RFCOMM_PF;
*p_data++ = RFCOMM_EA | 0;
*p_data = RFCOMM_DISC_FCS((uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET, cr, dlci);
p_buf->len = 4;
rfc_check_send_cmd(p_mcb, p_buf);
}
/*******************************************************************************
*
* Function rfc_send_buf_uih
*
* Description This function sends UIH frame.
*
******************************************************************************/
void rfc_send_buf_uih(tRFC_MCB* p_mcb, uint8_t dlci, BT_HDR* p_buf) {
uint8_t* p_data;
uint8_t cr = RFCOMM_CR(p_mcb->is_initiator, true);
uint8_t credits;
p_buf->offset -= RFCOMM_CTRL_FRAME_LEN;
if (p_buf->len > 127) p_buf->offset--;
if (dlci)
credits = (uint8_t)p_buf->layer_specific;
else
credits = 0;
if (credits) p_buf->offset--;
p_data = (uint8_t*)(p_buf + 1) + p_buf->offset;
/* UIH frame, command, PF = 0, dlci */
*p_data++ = RFCOMM_EA | cr | (dlci << RFCOMM_SHIFT_DLCI);
*p_data++ = RFCOMM_UIH | ((credits) ? RFCOMM_PF : 0);
if (p_buf->len <= 127) {
*p_data++ = RFCOMM_EA | (p_buf->len << 1);
p_buf->len += 3;
} else {
*p_data++ = (p_buf->len & 0x7f) << 1;
*p_data++ = p_buf->len >> RFCOMM_SHIFT_LENGTH2;
p_buf->len += 4;
}
if (credits) {
*p_data++ = credits;
p_buf->len++;
}
p_data = (uint8_t*)(p_buf + 1) + p_buf->offset + p_buf->len++;
*p_data = RFCOMM_UIH_FCS((uint8_t*)(p_buf + 1) + p_buf->offset, dlci);
if (dlci == RFCOMM_MX_DLCI) {
rfc_check_send_cmd(p_mcb, p_buf);
} else {
L2CA_DataWrite(p_mcb->lcid, p_buf);
}
}
/*******************************************************************************
*
* Function rfc_send_pn
*
* Description This function sends DLC Parameters Negotiation Frame.
*
******************************************************************************/
void rfc_send_pn(tRFC_MCB* p_mcb, uint8_t dlci, bool is_command, uint16_t mtu,
uint8_t cl, uint8_t k) {
uint8_t* p_data;
BT_HDR* p_buf = (BT_HDR*)osi_malloc(RFCOMM_CMD_BUF_SIZE);
p_buf->offset = L2CAP_MIN_OFFSET + RFCOMM_CTRL_FRAME_LEN;
p_data = (uint8_t*)(p_buf + 1) + p_buf->offset;
*p_data++ = RFCOMM_EA | RFCOMM_I_CR(is_command) | RFCOMM_MX_PN;
*p_data++ = RFCOMM_EA | (RFCOMM_MX_PN_LEN << 1);
*p_data++ = dlci;
*p_data++ = RFCOMM_PN_FRAM_TYPE_UIH | cl;
/* It appeared that we need to reply with the same priority bits as we
*received.
** We will use the fact that we reply in the same context so rx_frame can
*still be used.
*/
if (is_command)
*p_data++ = RFCOMM_PN_PRIORITY_0;
else
*p_data++ = rfc_cb.rfc.rx_frame.u.pn.priority;
*p_data++ = RFCOMM_T1_DSEC;
*p_data++ = mtu & 0xFF;
*p_data++ = mtu >> 8;
*p_data++ = RFCOMM_N2;
*p_data = k;
/* Total length is sizeof PN data + mx header 2 */
p_buf->len = RFCOMM_MX_PN_LEN + 2;
rfc_send_buf_uih(p_mcb, RFCOMM_MX_DLCI, p_buf);
}
/*******************************************************************************
*
* Function rfc_send_fcon
*
* Description This function sends Flow Control On Command.
*
******************************************************************************/
void rfc_send_fcon(tRFC_MCB* p_mcb, bool is_command) {
uint8_t* p_data;
BT_HDR* p_buf = (BT_HDR*)osi_malloc(RFCOMM_CMD_BUF_SIZE);
p_buf->offset = L2CAP_MIN_OFFSET + RFCOMM_CTRL_FRAME_LEN;
p_data = (uint8_t*)(p_buf + 1) + p_buf->offset;
*p_data++ = RFCOMM_EA | RFCOMM_I_CR(is_command) | RFCOMM_MX_FCON;
*p_data++ = RFCOMM_EA | (RFCOMM_MX_FCON_LEN << 1);
/* Total length is sizeof FCON data + mx header 2 */
p_buf->len = RFCOMM_MX_FCON_LEN + 2;
rfc_send_buf_uih(p_mcb, RFCOMM_MX_DLCI, p_buf);
}
/*******************************************************************************
*
* Function rfc_send_fcoff
*
* Description This function sends Flow Control Off Command.
*
******************************************************************************/
void rfc_send_fcoff(tRFC_MCB* p_mcb, bool is_command) {
uint8_t* p_data;
BT_HDR* p_buf = (BT_HDR*)osi_malloc(RFCOMM_CMD_BUF_SIZE);
p_buf->offset = L2CAP_MIN_OFFSET + RFCOMM_CTRL_FRAME_LEN;
p_data = (uint8_t*)(p_buf + 1) + p_buf->offset;
*p_data++ = RFCOMM_EA | RFCOMM_I_CR(is_command) | RFCOMM_MX_FCOFF;
*p_data++ = RFCOMM_EA | (RFCOMM_MX_FCOFF_LEN << 1);
/* Total length is sizeof FCOFF data + mx header 2 */
p_buf->len = RFCOMM_MX_FCOFF_LEN + 2;
rfc_send_buf_uih(p_mcb, RFCOMM_MX_DLCI, p_buf);
}
/*******************************************************************************
*
* Function rfc_send_msc
*
* Description This function sends Modem Status Command Frame.
*
******************************************************************************/
void rfc_send_msc(tRFC_MCB* p_mcb, uint8_t dlci, bool is_command,
tPORT_CTRL* p_pars) {
uint8_t* p_data;
uint8_t signals;
uint8_t break_duration;
uint8_t len;
BT_HDR* p_buf = (BT_HDR*)osi_malloc(RFCOMM_CMD_BUF_SIZE);
signals = p_pars->modem_signal;
break_duration = p_pars->break_signal;
p_buf->offset = L2CAP_MIN_OFFSET + RFCOMM_CTRL_FRAME_LEN;
p_data = (uint8_t*)(p_buf + 1) + p_buf->offset;
if (break_duration)
len = RFCOMM_MX_MSC_LEN_WITH_BREAK;
else
len = RFCOMM_MX_MSC_LEN_NO_BREAK;
*p_data++ = RFCOMM_EA | RFCOMM_I_CR(is_command) | RFCOMM_MX_MSC;
*p_data++ = RFCOMM_EA | (len << 1);
*p_data++ = RFCOMM_EA | RFCOMM_CR_MASK | (dlci << RFCOMM_SHIFT_DLCI);
*p_data++ = RFCOMM_EA | ((p_pars->fc) ? RFCOMM_MSC_FC : 0) |
((signals & MODEM_SIGNAL_DTRDSR) ? RFCOMM_MSC_RTC : 0) |
((signals & MODEM_SIGNAL_RTSCTS) ? RFCOMM_MSC_RTR : 0) |
((signals & MODEM_SIGNAL_RI) ? RFCOMM_MSC_IC : 0) |
((signals & MODEM_SIGNAL_DCD) ? RFCOMM_MSC_DV : 0);
if (break_duration) {
*p_data++ = RFCOMM_EA | RFCOMM_MSC_BREAK_PRESENT_MASK |
(break_duration << RFCOMM_MSC_SHIFT_BREAK);
}
/* Total length is sizeof MSC data + mx header 2 */
p_buf->len = len + 2;
rfc_send_buf_uih(p_mcb, RFCOMM_MX_DLCI, p_buf);
}
/*******************************************************************************
*
* Function rfc_send_rls
*
* Description This function sends Remote Line Status Command Frame.
*
******************************************************************************/
void rfc_send_rls(tRFC_MCB* p_mcb, uint8_t dlci, bool is_command,
uint8_t status) {
uint8_t* p_data;
BT_HDR* p_buf = (BT_HDR*)osi_malloc(RFCOMM_CMD_BUF_SIZE);
p_buf->offset = L2CAP_MIN_OFFSET + RFCOMM_CTRL_FRAME_LEN;
p_data = (uint8_t*)(p_buf + 1) + p_buf->offset;
*p_data++ = RFCOMM_EA | RFCOMM_I_CR(is_command) | RFCOMM_MX_RLS;
*p_data++ = RFCOMM_EA | (RFCOMM_MX_RLS_LEN << 1);
*p_data++ = RFCOMM_EA | RFCOMM_CR_MASK | (dlci << RFCOMM_SHIFT_DLCI);
*p_data++ = RFCOMM_RLS_ERROR | status;
/* Total length is sizeof RLS data + mx header 2 */
p_buf->len = RFCOMM_MX_RLS_LEN + 2;
rfc_send_buf_uih(p_mcb, RFCOMM_MX_DLCI, p_buf);
}
/*******************************************************************************
*
* Function rfc_send_nsc
*
* Description This function sends Non Supported Command Response.
*
******************************************************************************/
void rfc_send_nsc(tRFC_MCB* p_mcb) {
uint8_t* p_data;
BT_HDR* p_buf = (BT_HDR*)osi_malloc(RFCOMM_CMD_BUF_SIZE);
p_buf->offset = L2CAP_MIN_OFFSET + RFCOMM_CTRL_FRAME_LEN;
p_data = (uint8_t*)(p_buf + 1) + p_buf->offset;
*p_data++ = RFCOMM_EA | RFCOMM_I_CR(false) | RFCOMM_MX_NSC;
*p_data++ = RFCOMM_EA | (RFCOMM_MX_NSC_LEN << 1);
*p_data++ = rfc_cb.rfc.rx_frame.ea |
(rfc_cb.rfc.rx_frame.cr << RFCOMM_SHIFT_CR) |
rfc_cb.rfc.rx_frame.type;
/* Total length is sizeof NSC data + mx header 2 */
p_buf->len = RFCOMM_MX_NSC_LEN + 2;
rfc_send_buf_uih(p_mcb, RFCOMM_MX_DLCI, p_buf);
}
/*******************************************************************************
*
* Function rfc_send_rpn
*
* Description This function sends Remote Port Negotiation Command
*
******************************************************************************/
void rfc_send_rpn(tRFC_MCB* p_mcb, uint8_t dlci, bool is_command,
tPORT_STATE* p_pars, uint16_t mask) {
uint8_t* p_data;
BT_HDR* p_buf = (BT_HDR*)osi_malloc(RFCOMM_CMD_BUF_SIZE);
p_buf->offset = L2CAP_MIN_OFFSET + RFCOMM_CTRL_FRAME_LEN;
p_data = (uint8_t*)(p_buf + 1) + p_buf->offset;
*p_data++ = RFCOMM_EA | RFCOMM_I_CR(is_command) | RFCOMM_MX_RPN;
if (!p_pars) {
*p_data++ = RFCOMM_EA | (RFCOMM_MX_RPN_REQ_LEN << 1);
*p_data++ = RFCOMM_EA | RFCOMM_CR_MASK | (dlci << RFCOMM_SHIFT_DLCI);
p_buf->len = RFCOMM_MX_RPN_REQ_LEN + 2;
} else {
*p_data++ = RFCOMM_EA | (RFCOMM_MX_RPN_LEN << 1);
*p_data++ = RFCOMM_EA | RFCOMM_CR_MASK | (dlci << RFCOMM_SHIFT_DLCI);
*p_data++ = p_pars->baud_rate;
*p_data++ = (p_pars->byte_size << RFCOMM_RPN_BITS_SHIFT) |
(p_pars->stop_bits << RFCOMM_RPN_STOP_BITS_SHIFT) |
(p_pars->parity << RFCOMM_RPN_PARITY_SHIFT) |
(p_pars->parity_type << RFCOMM_RPN_PARITY_TYPE_SHIFT);
*p_data++ = p_pars->fc_type;
*p_data++ = p_pars->xon_char;
*p_data++ = p_pars->xoff_char;
*p_data++ = (mask & 0xFF);
*p_data++ = (mask >> 8);
/* Total length is sizeof RPN data + mx header 2 */
p_buf->len = RFCOMM_MX_RPN_LEN + 2;
}
rfc_send_buf_uih(p_mcb, RFCOMM_MX_DLCI, p_buf);
}
/*******************************************************************************
*
* Function rfc_send_test
*
* Description This function sends Test frame.
*
******************************************************************************/
void rfc_send_test(tRFC_MCB* p_mcb, bool is_command, BT_HDR* p_buf) {
/* Shift buffer to give space for header */
if (p_buf->offset < (L2CAP_MIN_OFFSET + RFCOMM_MIN_OFFSET + 2)) {
uint8_t* p_src = (uint8_t*)(p_buf + 1) + p_buf->offset + p_buf->len - 1;
BT_HDR* p_new_buf =
(BT_HDR*)osi_malloc(p_buf->len + (L2CAP_MIN_OFFSET + RFCOMM_MIN_OFFSET +
2 + sizeof(BT_HDR) + 1));
p_new_buf->offset = L2CAP_MIN_OFFSET + RFCOMM_MIN_OFFSET + 2;
p_new_buf->len = p_buf->len;
uint8_t* p_dest =
(uint8_t*)(p_new_buf + 1) + p_new_buf->offset + p_new_buf->len - 1;
for (uint16_t xx = 0; xx < p_buf->len; xx++) *p_dest-- = *p_src--;
osi_free(p_buf);
p_buf = p_new_buf;
}
/* Adjust offset by number of bytes we are going to fill */
p_buf->offset -= 2;
uint8_t* p_data = (uint8_t*)(p_buf + 1) + p_buf->offset;
*p_data++ = RFCOMM_EA | RFCOMM_I_CR(is_command) | RFCOMM_MX_TEST;
*p_data++ = RFCOMM_EA | (p_buf->len << 1);
p_buf->len += 2;
rfc_send_buf_uih(p_mcb, RFCOMM_MX_DLCI, p_buf);
}
/*******************************************************************************
*
* Function rfc_send_credit
*
* Description This function sends a flow control credit in UIH frame.
*
******************************************************************************/
void rfc_send_credit(tRFC_MCB* p_mcb, uint8_t dlci, uint8_t credit) {
uint8_t* p_data;
uint8_t cr = RFCOMM_CR(p_mcb->is_initiator, true);
BT_HDR* p_buf = (BT_HDR*)osi_malloc(RFCOMM_CMD_BUF_SIZE);
p_buf->offset = L2CAP_MIN_OFFSET;
p_data = (uint8_t*)(p_buf + 1) + p_buf->offset;
*p_data++ = RFCOMM_EA | cr | (dlci << RFCOMM_SHIFT_DLCI);
*p_data++ = RFCOMM_UIH | RFCOMM_PF;
*p_data++ = RFCOMM_EA | 0;
*p_data++ = credit;
*p_data = RFCOMM_UIH_FCS((uint8_t*)(p_buf + 1) + p_buf->offset, dlci);
p_buf->len = 5;
rfc_check_send_cmd(p_mcb, p_buf);
}
/*******************************************************************************
*
* Function rfc_parse_data
*
* Description This function processes data packet received from L2CAP
*
******************************************************************************/
uint8_t rfc_parse_data(tRFC_MCB* p_mcb, MX_FRAME* p_frame, BT_HDR* p_buf) {
uint8_t ead, eal, fcs;
uint8_t* p_data = (uint8_t*)(p_buf + 1) + p_buf->offset;
uint8_t* p_start = p_data;
uint16_t len;
if (p_buf->len < RFCOMM_CTRL_FRAME_LEN) {
RFCOMM_TRACE_ERROR("Bad Length1: %d", p_buf->len);
return (RFC_EVENT_BAD_FRAME);
}
RFCOMM_PARSE_CTRL_FIELD(ead, p_frame->cr, p_frame->dlci, p_data);
if (!ead) {
RFCOMM_TRACE_ERROR("Bad Address(EA must be 1)");
return (RFC_EVENT_BAD_FRAME);
}
RFCOMM_PARSE_TYPE_FIELD(p_frame->type, p_frame->pf, p_data);
eal = *(p_data)&RFCOMM_EA;
len = *(p_data)++ >> RFCOMM_SHIFT_LENGTH1;
if (eal == 0 && p_buf->len > RFCOMM_CTRL_FRAME_LEN) {
len += (*(p_data)++ << RFCOMM_SHIFT_LENGTH2);
} else if (eal == 0) {
RFCOMM_TRACE_ERROR("Bad Length when EAL = 0: %d", p_buf->len);
android_errorWriteLog(0x534e4554, "78288018");
return RFC_EVENT_BAD_FRAME;
}
p_buf->len -= (3 + !ead + !eal + 1); /* Additional 1 for FCS */
p_buf->offset += (3 + !ead + !eal);
/* handle credit if credit based flow control */
if ((p_mcb->flow == PORT_FC_CREDIT) && (p_frame->type == RFCOMM_UIH) &&
(p_frame->dlci != RFCOMM_MX_DLCI) && (p_frame->pf == 1)) {
p_frame->credit = *p_data++;
p_buf->len--;
p_buf->offset++;
} else
p_frame->credit = 0;
if (p_buf->len != len) {
RFCOMM_TRACE_ERROR("Bad Length2 %d %d", p_buf->len, len);
return (RFC_EVENT_BAD_FRAME);
}
fcs = *(p_data + len);
/* All control frames that we are sending are sent with P=1, expect */
/* reply with F=1 */
/* According to TS 07.10 spec ivalid frames are discarded without */
/* notification to the sender */
switch (p_frame->type) {
case RFCOMM_SABME:
if (RFCOMM_FRAME_IS_RSP(p_mcb->is_initiator, p_frame->cr) ||
!p_frame->pf || len || !RFCOMM_VALID_DLCI(p_frame->dlci) ||
!rfc_check_fcs(RFCOMM_CTRL_FRAME_LEN, p_start, fcs)) {
RFCOMM_TRACE_ERROR("Bad SABME");
return (RFC_EVENT_BAD_FRAME);
} else
return (RFC_EVENT_SABME);
case RFCOMM_UA:
if (RFCOMM_FRAME_IS_CMD(p_mcb->is_initiator, p_frame->cr) ||
!p_frame->pf || len || !RFCOMM_VALID_DLCI(p_frame->dlci) ||
!rfc_check_fcs(RFCOMM_CTRL_FRAME_LEN, p_start, fcs)) {
RFCOMM_TRACE_ERROR("Bad UA");
return (RFC_EVENT_BAD_FRAME);
} else
return (RFC_EVENT_UA);
case RFCOMM_DM:
if (RFCOMM_FRAME_IS_CMD(p_mcb->is_initiator, p_frame->cr) || len ||
!RFCOMM_VALID_DLCI(p_frame->dlci) ||
!rfc_check_fcs(RFCOMM_CTRL_FRAME_LEN, p_start, fcs)) {
RFCOMM_TRACE_ERROR("Bad DM");
return (RFC_EVENT_BAD_FRAME);
} else
return (RFC_EVENT_DM);
case RFCOMM_DISC:
if (RFCOMM_FRAME_IS_RSP(p_mcb->is_initiator, p_frame->cr) ||
!p_frame->pf || len || !RFCOMM_VALID_DLCI(p_frame->dlci) ||
!rfc_check_fcs(RFCOMM_CTRL_FRAME_LEN, p_start, fcs)) {
RFCOMM_TRACE_ERROR("Bad DISC");
return (RFC_EVENT_BAD_FRAME);
} else
return (RFC_EVENT_DISC);
case RFCOMM_UIH:
if (!RFCOMM_VALID_DLCI(p_frame->dlci)) {
RFCOMM_TRACE_ERROR("Bad UIH - invalid DLCI");
return (RFC_EVENT_BAD_FRAME);
} else if (!rfc_check_fcs(2, p_start, fcs)) {
RFCOMM_TRACE_ERROR("Bad UIH - FCS");
return (RFC_EVENT_BAD_FRAME);
} else if (RFCOMM_FRAME_IS_RSP(p_mcb->is_initiator, p_frame->cr)) {
/* we assume that this is ok to allow bad implementations to work */
RFCOMM_TRACE_ERROR("Bad UIH - response");
return (RFC_EVENT_UIH);
} else
return (RFC_EVENT_UIH);
}
return (RFC_EVENT_BAD_FRAME);
}
/*******************************************************************************
*
* Function rfc_process_mx_message
*
* Description This function processes UIH frames received on the
* multiplexer control channel.
*
******************************************************************************/
void rfc_process_mx_message(tRFC_MCB* p_mcb, BT_HDR* p_buf) {
uint8_t* p_data = (uint8_t*)(p_buf + 1) + p_buf->offset;
MX_FRAME* p_rx_frame = &rfc_cb.rfc.rx_frame;
uint16_t length = p_buf->len;
uint8_t ea, cr, mx_len;
bool is_command;
if (length < 2) {
RFCOMM_TRACE_ERROR(
"%s: Illegal MX Frame len when reading EA, C/R. len:%d < 2", __func__,
length);
android_errorWriteLog(0x534e4554, "111937065");
osi_free(p_buf);
return;
}
p_rx_frame->ea = *p_data & RFCOMM_EA;
p_rx_frame->cr = (*p_data & RFCOMM_CR_MASK) >> RFCOMM_SHIFT_CR;
p_rx_frame->type = *p_data++ & ~(RFCOMM_CR_MASK | RFCOMM_EA_MASK);
if (!p_rx_frame->ea || !length) {
RFCOMM_TRACE_ERROR("Illegal MX Frame ea:%d len:%d", p_rx_frame->ea, length);
osi_free(p_buf);
return;
}
length--;
is_command = p_rx_frame->cr;
ea = *p_data & RFCOMM_EA;
mx_len = *p_data++ >> RFCOMM_SHIFT_LENGTH1;
length--;
if (!ea) {
if (length < 1) {
RFCOMM_TRACE_ERROR("%s: Illegal MX Frame when EA = 0. len:%d < 1",
__func__, length);
android_errorWriteLog(0x534e4554, "111937065");
osi_free(p_buf);
return;
}
mx_len += *p_data++ << RFCOMM_SHIFT_LENGTH2;
length--;
}
if (mx_len != length) {
RFCOMM_TRACE_ERROR("Bad MX frame");
osi_free(p_buf);
return;
}
switch (p_rx_frame->type) {
case RFCOMM_MX_PN:
if (length != RFCOMM_MX_PN_LEN) break;
p_rx_frame->dlci = *p_data++ & RFCOMM_PN_DLCI_MASK;
p_rx_frame->u.pn.frame_type = *p_data & RFCOMM_PN_FRAME_TYPE_MASK;
p_rx_frame->u.pn.conv_layer = *p_data++ & RFCOMM_PN_CONV_LAYER_MASK;
p_rx_frame->u.pn.priority = *p_data++ & RFCOMM_PN_PRIORITY_MASK;
p_rx_frame->u.pn.t1 = *p_data++;
p_rx_frame->u.pn.mtu = *p_data + (*(p_data + 1) << 8);
p_data += 2;
p_rx_frame->u.pn.n2 = *p_data++;
p_rx_frame->u.pn.k = *p_data++ & RFCOMM_PN_K_MASK;
if (!p_rx_frame->dlci || !RFCOMM_VALID_DLCI(p_rx_frame->dlci) ||
(p_rx_frame->u.pn.mtu < RFCOMM_MIN_MTU) ||
(p_rx_frame->u.pn.mtu > RFCOMM_MAX_MTU)) {
RFCOMM_TRACE_ERROR("Bad PN frame");
break;
}
osi_free(p_buf);
rfc_process_pn(p_mcb, is_command, p_rx_frame);
return;
case RFCOMM_MX_TEST:
if (!length) break;
p_rx_frame->u.test.p_data = p_data;
p_rx_frame->u.test.data_len = length;
p_buf->offset += 2;
p_buf->len -= 2;
if (is_command)
rfc_send_test(p_mcb, false, p_buf);
else
rfc_process_test_rsp(p_mcb, p_buf);
return;
case RFCOMM_MX_FCON:
if (length != RFCOMM_MX_FCON_LEN) break;
osi_free(p_buf);
rfc_process_fcon(p_mcb, is_command);
return;
case RFCOMM_MX_FCOFF:
if (length != RFCOMM_MX_FCOFF_LEN) break;
osi_free(p_buf);
rfc_process_fcoff(p_mcb, is_command);
return;
case RFCOMM_MX_MSC:
if (length != RFCOMM_MX_MSC_LEN_WITH_BREAK &&
length != RFCOMM_MX_MSC_LEN_NO_BREAK) {
RFCOMM_TRACE_ERROR("%s: Illegal MX MSC Frame len:%d", __func__, length);
android_errorWriteLog(0x534e4554, "111937065");
osi_free(p_buf);
return;
}
ea = *p_data & RFCOMM_EA;
cr = (*p_data & RFCOMM_CR_MASK) >> RFCOMM_SHIFT_CR;
p_rx_frame->dlci = *p_data++ >> RFCOMM_SHIFT_DLCI;
if (!ea || !cr || !p_rx_frame->dlci ||
!RFCOMM_VALID_DLCI(p_rx_frame->dlci)) {
RFCOMM_TRACE_ERROR("Bad MSC frame");
break;
}
p_rx_frame->u.msc.signals = *p_data++;
if (mx_len == RFCOMM_MX_MSC_LEN_WITH_BREAK) {
p_rx_frame->u.msc.break_present =
*p_data & RFCOMM_MSC_BREAK_PRESENT_MASK;
p_rx_frame->u.msc.break_duration =
(*p_data & RFCOMM_MSC_BREAK_MASK) >> RFCOMM_MSC_SHIFT_BREAK;
} else {
p_rx_frame->u.msc.break_present = false;
p_rx_frame->u.msc.break_duration = 0;
}
osi_free(p_buf);
rfc_process_msc(p_mcb, is_command, p_rx_frame);
return;
case RFCOMM_MX_NSC:
if ((length != RFCOMM_MX_NSC_LEN) || !is_command) break;
p_rx_frame->u.nsc.ea = *p_data & RFCOMM_EA;
p_rx_frame->u.nsc.cr = (*p_data & RFCOMM_CR_MASK) >> RFCOMM_SHIFT_CR;
p_rx_frame->u.nsc.type = *p_data++ >> RFCOMM_SHIFT_DLCI;
osi_free(p_buf);
rfc_process_nsc(p_mcb, p_rx_frame);
return;
case RFCOMM_MX_RPN:
if ((length != RFCOMM_MX_RPN_REQ_LEN) && (length != RFCOMM_MX_RPN_LEN))
break;
ea = *p_data & RFCOMM_EA;
cr = (*p_data & RFCOMM_CR_MASK) >> RFCOMM_SHIFT_CR;
p_rx_frame->dlci = *p_data++ >> RFCOMM_SHIFT_DLCI;
if (!ea || !cr || !p_rx_frame->dlci ||
!RFCOMM_VALID_DLCI(p_rx_frame->dlci)) {
RFCOMM_TRACE_ERROR("Bad RPN frame");
break;
}
p_rx_frame->u.rpn.is_request = (length == RFCOMM_MX_RPN_REQ_LEN);
if (!p_rx_frame->u.rpn.is_request) {
p_rx_frame->u.rpn.baud_rate = *p_data++;
p_rx_frame->u.rpn.byte_size =
(*p_data >> RFCOMM_RPN_BITS_SHIFT) & RFCOMM_RPN_BITS_MASK;
p_rx_frame->u.rpn.stop_bits =
(*p_data >> RFCOMM_RPN_STOP_BITS_SHIFT) & RFCOMM_RPN_STOP_BITS_MASK;
p_rx_frame->u.rpn.parity =
(*p_data >> RFCOMM_RPN_PARITY_SHIFT) & RFCOMM_RPN_PARITY_MASK;
p_rx_frame->u.rpn.parity_type =
(*p_data++ >> RFCOMM_RPN_PARITY_TYPE_SHIFT) &
RFCOMM_RPN_PARITY_TYPE_MASK;
p_rx_frame->u.rpn.fc_type = *p_data++ & RFCOMM_FC_MASK;
p_rx_frame->u.rpn.xon_char = *p_data++;
p_rx_frame->u.rpn.xoff_char = *p_data++;
p_rx_frame->u.rpn.param_mask =
(*p_data + (*(p_data + 1) << 8)) & RFCOMM_RPN_PM_MASK;
}
osi_free(p_buf);
rfc_process_rpn(p_mcb, is_command, p_rx_frame->u.rpn.is_request,
p_rx_frame);
return;
case RFCOMM_MX_RLS:
if (length != RFCOMM_MX_RLS_LEN) break;
ea = *p_data & RFCOMM_EA;
cr = (*p_data & RFCOMM_CR_MASK) >> RFCOMM_SHIFT_CR;
p_rx_frame->dlci = *p_data++ >> RFCOMM_SHIFT_DLCI;
p_rx_frame->u.rls.line_status = (*p_data & ~0x01);
if (!ea || !cr || !p_rx_frame->dlci ||
!RFCOMM_VALID_DLCI(p_rx_frame->dlci)) {
RFCOMM_TRACE_ERROR("Bad RPN frame");
break;
}
osi_free(p_buf);
rfc_process_rls(p_mcb, is_command, p_rx_frame);
return;
}
osi_free(p_buf);
if (is_command) rfc_send_nsc(p_mcb);
}