/****************************************************************************** * * 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); } }