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Diffstat (limited to 'stack/rfcomm/rfc_utils.c')
| -rw-r--r-- | stack/rfcomm/rfc_utils.c | 467 |
1 files changed, 467 insertions, 0 deletions
diff --git a/stack/rfcomm/rfc_utils.c b/stack/rfcomm/rfc_utils.c new file mode 100644 index 0000000..49405ac --- /dev/null +++ b/stack/rfcomm/rfc_utils.c @@ -0,0 +1,467 @@ +/****************************************************************************** + * + * 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 collection of utility functions used the RFCOMM unit + * + *****************************************************************************/ + +#include "bt_target.h" +#include "gki.h" + +#include "btm_api.h" +#include "btm_int.h" +#include "rfcdefs.h" +#include "port_api.h" +#include "port_ext.h" +#include "port_int.h" +#include "rfc_int.h" +#include "btu.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 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 rfc_calc_fcs (UINT16 len, UINT8 *p) +{ + UINT8 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 +** +*******************************************************************************/ +BOOLEAN rfc_check_fcs (UINT16 len, UINT8 *p, UINT8 received_fcs) +{ + UINT8 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 BD_ADDR. +** +*******************************************************************************/ +tRFC_MCB *rfc_alloc_multiplexer_channel (BD_ADDR bd_addr, BOOLEAN is_initiator) +{ + int i, j; + tRFC_MCB *p_mcb = NULL; + + for (i = 0; i < MAX_BD_CONNECTIONS; i++) + { + if ((rfc_cb.port.rfc_mcb[i].state != RFC_MX_STATE_IDLE) + && (!memcmp (rfc_cb.port.rfc_mcb[i].bd_addr, bd_addr, BD_ADDR_LEN))) + { + /* 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]); + 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 */ + memset (p_mcb, 0, sizeof (tRFC_MCB)); + memcpy (p_mcb->bd_addr, bd_addr, BD_ADDR_LEN); + + GKI_init_q(&p_mcb->cmd_q); + + p_mcb->is_initiator = is_initiator; + + rfc_timer_start (p_mcb, RFC_MCB_INIT_INACT_TIMER); + + rfc_cb.rfc.last_mux = (UINT8) j; + return (p_mcb); + } + } + return (NULL); +} + + +/******************************************************************************* +** +** Function rfc_release_multiplexer_channel +** +** Description This function returns existing or new control block for +** the BD_ADDR. +** +*******************************************************************************/ +void rfc_release_multiplexer_channel (tRFC_MCB *p_mcb) +{ + void *p_buf; + + rfc_timer_stop (p_mcb); + + while ((p_buf = GKI_dequeue(&p_mcb->cmd_q)) != NULL) + GKI_freebuf(p_buf); + + 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 timeout) +{ + TIMER_LIST_ENT *p_tle = &p_mcb->tle; + + RFCOMM_TRACE_EVENT1 ("rfc_timer_start - timeout:%d", timeout); + + p_tle->param = (UINT32)p_mcb; + + btu_start_timer (p_tle, BTU_TTYPE_RFCOMM_MFC, timeout); +} + + +/******************************************************************************* +** +** Function rfc_timer_stop +** +** Description Stop RFC Timer +** +*******************************************************************************/ +void rfc_timer_stop (tRFC_MCB *p_mcb) +{ + RFCOMM_TRACE_EVENT0 ("rfc_timer_stop"); + + btu_stop_timer (&p_mcb->tle); +} + + +/******************************************************************************* +** +** Function rfc_port_timer_start +** +** Description Start RFC Timer +** +*******************************************************************************/ +void rfc_port_timer_start (tPORT *p_port, UINT16 timeout) +{ + TIMER_LIST_ENT *p_tle = &p_port->rfc.tle; + + RFCOMM_TRACE_EVENT1 ("rfc_port_timer_start - timeout:%d", timeout); + + p_tle->param = (UINT32)p_port; + + btu_start_timer (p_tle, BTU_TTYPE_RFCOMM_PORT, timeout); +} + + +/******************************************************************************* +** +** Function rfc_port_timer_stop +** +** Description Stop RFC Timer +** +*******************************************************************************/ +void rfc_port_timer_stop (tPORT *p_port) +{ + RFCOMM_TRACE_EVENT0 ("rfc_port_timer_stop"); + + btu_stop_timer (&p_port->rfc.tle); +} + + +/******************************************************************************* +** +** 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 i; + + for (i = 0; i < RFCOMM_MAX_DLCI; i++) + { + if (p_mcb->port_inx[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); +} + + +/******************************************************************************* +** +** Function rfcomm_process_timeout +** +** Description The function called every second to check RFCOMM timers +** +** Returns void +** +*******************************************************************************/ +void rfcomm_process_timeout (TIMER_LIST_ENT *p_tle) +{ + switch (p_tle->event) + { + case BTU_TTYPE_RFCOMM_MFC: + rfc_mx_sm_execute ((tRFC_MCB *)p_tle->param, RFC_EVENT_TIMEOUT, NULL); + break; + + case BTU_TTYPE_RFCOMM_PORT: + rfc_port_sm_execute ((tPORT *)p_tle->param, RFC_EVENT_TIMEOUT, NULL); + break; + + default: + break; + } +} + + +/******************************************************************************* +** +** 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 (BD_ADDR bd_addr, void *p_ref_data, UINT8 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; + + RFCOMM_TRACE_DEBUG0 ("rfc_port_closed"); + + 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_inx[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 credit) +{ + if (p_port->rfc.p_mcb->flow == PORT_FC_CREDIT) + { + p_port->credit_tx += credit; + + RFCOMM_TRACE_EVENT1 ("rfc_inc_credit:%d", p_port->credit_tx); + + if (p_port->tx.peer_fc == TRUE) + 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) +{ + BT_HDR *p; + + /* if passed a buffer queue it */ + if (p_buf != NULL) + { + GKI_enqueue(&p_mcb->cmd_q, p_buf); + } + + /* handle queue if L2CAP not congested */ + while (p_mcb->l2cap_congested == FALSE) + { + if ((p = (BT_HDR *) GKI_dequeue(&p_mcb->cmd_q)) == NULL) + { + break; + } + + + L2CA_DataWrite (p_mcb->lcid, p); + } +} + + |