| /****************************************************************************** |
| * |
| * 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_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> |
| |
| extern fixed_queue_t* btu_general_alarm_queue; |
| |
| /******************************************************************************* |
| * |
| * 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); |
| |
| period_ms_t interval_ms = timeout * 1000; |
| alarm_set_on_queue(p_mcb->mcb_timer, interval_ms, rfcomm_mcb_timer_timeout, |
| p_mcb, btu_general_alarm_queue); |
| } |
| |
| /******************************************************************************* |
| * |
| * 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); |
| |
| period_ms_t interval_ms = timeout * 1000; |
| alarm_set_on_queue(p_port->rfc.port_timer, interval_ms, |
| rfcomm_port_timer_timeout, p_port, |
| btu_general_alarm_queue); |
| } |
| |
| /******************************************************************************* |
| * |
| * 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_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); |
| } |
| |
| 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; |
| |
| RFCOMM_TRACE_DEBUG("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_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 == 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) { |
| /* 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 == false) { |
| BT_HDR* p = (BT_HDR*)fixed_queue_try_dequeue(p_mcb->cmd_q); |
| if (p == NULL) break; |
| L2CA_DataWrite(p_mcb->lcid, p); |
| } |
| } |