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esp-idf/components/bt/bluedroid/stack/rfcomm/rfc_ts_frames.c

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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_target.h"
#include "gki.h"
#include "rfcdefs.h"
#include "port_api.h"
#include "l2c_api.h"
#include "port_int.h"
#include "rfc_int.h"
/*******************************************************************************
**
** Function rfc_send_sabme
**
** Description This function sends SABME frame.
**
*******************************************************************************/
void rfc_send_sabme (tRFC_MCB *p_mcb, UINT8 dlci)
{
BT_HDR *p_buf;
UINT8 *p_data;
UINT8 cr = RFCOMM_CR(p_mcb->is_initiator, TRUE);
if ((p_buf = (BT_HDR *)GKI_getpoolbuf (RFCOMM_CMD_POOL_ID)) == NULL) {
return;
}
p_buf->offset = L2CAP_MIN_OFFSET;
p_data = (UINT8 *)(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 *)(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 dlci)
{
BT_HDR *p_buf;
UINT8 *p_data;
UINT8 cr = RFCOMM_CR(p_mcb->is_initiator, FALSE);
if ((p_buf = (BT_HDR *)GKI_getpoolbuf (RFCOMM_CMD_POOL_ID)) == NULL) {
return;
}
p_buf->offset = L2CAP_MIN_OFFSET;
p_data = (UINT8 *)(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 *)(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 dlci, BOOLEAN pf)
{
BT_HDR *p_buf;
UINT8 *p_data;
UINT8 cr = RFCOMM_CR(p_mcb->is_initiator, FALSE);
if ((p_buf = (BT_HDR *)GKI_getpoolbuf (RFCOMM_CMD_POOL_ID)) == NULL) {
return;
}
p_buf->offset = L2CAP_MIN_OFFSET;
p_data = (UINT8 *)(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 *)(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 dlci)
{
BT_HDR *p_buf;
UINT8 *p_data;
UINT8 cr = RFCOMM_CR(p_mcb->is_initiator, TRUE);
if ((p_buf = (BT_HDR *)GKI_getpoolbuf (RFCOMM_CMD_POOL_ID)) == NULL) {
return;
}
p_buf->offset = L2CAP_MIN_OFFSET;
p_data = (UINT8 *)(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 *)(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 dlci, BT_HDR *p_buf)
{
UINT8 *p_data;
UINT8 cr = RFCOMM_CR(p_mcb->is_initiator, TRUE);
UINT8 credits;
p_buf->offset -= RFCOMM_CTRL_FRAME_LEN;
if (p_buf->len > 127) {
p_buf->offset--;
}
if (dlci) {
credits = (UINT8)p_buf->layer_specific;
} else {
credits = 0;
}
if (credits) {
p_buf->offset--;
}
p_data = (UINT8 *)(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 *)(p_buf + 1) + p_buf->offset + p_buf->len++;
*p_data = RFCOMM_UIH_FCS ((UINT8 *)(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 dlci, BOOLEAN is_command, UINT16 mtu, UINT8 cl, UINT8 k)
{
BT_HDR *p_buf;
UINT8 *p_data;
if ((p_buf = (BT_HDR *)GKI_getpoolbuf (RFCOMM_CMD_POOL_ID)) == NULL) {
return;
}
p_buf->offset = L2CAP_MIN_OFFSET + RFCOMM_CTRL_FRAME_LEN;
p_data = (UINT8 *)(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, BOOLEAN is_command)
{
BT_HDR *p_buf;
UINT8 *p_data;
if ((p_buf = (BT_HDR *)GKI_getpoolbuf (RFCOMM_CMD_POOL_ID)) == NULL) {
return;
}
p_buf->offset = L2CAP_MIN_OFFSET + RFCOMM_CTRL_FRAME_LEN;
p_data = (UINT8 *)(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, BOOLEAN is_command)
{
BT_HDR *p_buf;
UINT8 *p_data;
if ((p_buf = (BT_HDR *)GKI_getpoolbuf (RFCOMM_CMD_POOL_ID)) == NULL) {
return;
}
p_buf->offset = L2CAP_MIN_OFFSET + RFCOMM_CTRL_FRAME_LEN;
p_data = (UINT8 *)(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 dlci, BOOLEAN is_command,
tPORT_CTRL *p_pars)
{
BT_HDR *p_buf;
UINT8 *p_data;
UINT8 signals;
UINT8 break_duration;
UINT8 len;
signals = p_pars->modem_signal;
break_duration = p_pars->break_signal;
if ((p_buf = (BT_HDR *)GKI_getpoolbuf (RFCOMM_CMD_POOL_ID)) == NULL) {
return;
}
p_buf->offset = L2CAP_MIN_OFFSET + RFCOMM_CTRL_FRAME_LEN;
p_data = (UINT8 *)(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 dlci, BOOLEAN is_command, UINT8 status)
{
BT_HDR *p_buf;
UINT8 *p_data;
if ((p_buf = (BT_HDR *)GKI_getpoolbuf (RFCOMM_CMD_POOL_ID)) == NULL) {
return;
}
p_buf->offset = L2CAP_MIN_OFFSET + RFCOMM_CTRL_FRAME_LEN;
p_data = (UINT8 *)(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)
{
BT_HDR *p_buf;
UINT8 *p_data;
if ((p_buf = (BT_HDR *)GKI_getpoolbuf (RFCOMM_CMD_POOL_ID)) == NULL) {
return;
}
p_buf->offset = L2CAP_MIN_OFFSET + RFCOMM_CTRL_FRAME_LEN;
p_data = (UINT8 *)(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 dlci, BOOLEAN is_command,
tPORT_STATE *p_pars, UINT16 mask)
{
BT_HDR *p_buf;
UINT8 *p_data;
if ((p_buf = (BT_HDR *)GKI_getpoolbuf (RFCOMM_CMD_POOL_ID)) == NULL) {
return;
}
p_buf->offset = L2CAP_MIN_OFFSET + RFCOMM_CTRL_FRAME_LEN;
p_data = (UINT8 *)(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, BOOLEAN is_command, BT_HDR *p_buf)
{
UINT8 *p_data;
UINT16 xx;
UINT8 *p_src, *p_dest;
/* Shift buffer to give space for header */
if (p_buf->offset < (L2CAP_MIN_OFFSET + RFCOMM_MIN_OFFSET + 2)) {
p_src = (UINT8 *) (p_buf + 1) + p_buf->offset + p_buf->len - 1;
p_dest = (UINT8 *) (p_buf + 1) + L2CAP_MIN_OFFSET + RFCOMM_MIN_OFFSET + 2 + p_buf->len - 1;
for (xx = 0; xx < p_buf->len; xx++) {
*p_dest-- = *p_src--;
}
p_buf->offset = L2CAP_MIN_OFFSET + RFCOMM_MIN_OFFSET + 2;
}
/* Adjust offset by number of bytes we are going to fill */
p_buf->offset -= 2;
p_data = (UINT8 *)(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 dlci, UINT8 credit)
{
BT_HDR *p_buf;
UINT8 *p_data;
UINT8 cr = RFCOMM_CR(p_mcb->is_initiator, TRUE);
if ((p_buf = (BT_HDR *)GKI_getpoolbuf (RFCOMM_CMD_POOL_ID)) == NULL) {
return;
}
p_buf->offset = L2CAP_MIN_OFFSET;
p_data = (UINT8 *)(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 *)(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 rfc_parse_data (tRFC_MCB *p_mcb, MX_FRAME *p_frame, BT_HDR *p_buf)
{
UINT8 ead, eal, fcs;
UINT8 *p_data = (UINT8 *)(p_buf + 1) + p_buf->offset;
UINT8 *p_start = p_data;
UINT16 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);
RFCOMM_PARSE_LEN_FIELD (eal, len, p_data);
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 *p_data = (UINT8 *)(p_buf + 1) + p_buf->offset;
MX_FRAME *p_rx_frame = &rfc_cb.rfc.rx_frame;
UINT16 length = p_buf->len;
UINT8 ea, cr, mx_len;
BOOLEAN is_command;
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);
GKI_freebuf (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) {
mx_len += *p_data++ << RFCOMM_SHIFT_LENGTH2;
length --;
}
if (mx_len != length) {
RFCOMM_TRACE_ERROR ("Bad MX frame");
GKI_freebuf (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;
}
GKI_freebuf (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;
}
GKI_freebuf (p_buf);
rfc_process_fcon (p_mcb, is_command);
return;
case RFCOMM_MX_FCOFF:
if (length != RFCOMM_MX_FCOFF_LEN) {
break;
}
GKI_freebuf (p_buf);
rfc_process_fcoff (p_mcb, is_command);
return;
case RFCOMM_MX_MSC:
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;
}
GKI_freebuf (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;
GKI_freebuf (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;
}
GKI_freebuf (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;
}
GKI_freebuf (p_buf);
rfc_process_rls (p_mcb, is_command, p_rx_frame);
return;
}
GKI_freebuf (p_buf);
if (is_command) {
rfc_send_nsc (p_mcb);
}
}
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