/****************************************************************************** * * 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 "bt_utils.h" #include /******************************************************************************* ** ** 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; RFCOMM_TRACE_DEBUG("rfc_alloc_multiplexer_channel: bd_addr:%02x:%02x:%02x:%02x:%02x:%02x", bd_addr[0], bd_addr[1], bd_addr[2], bd_addr[3], bd_addr[4], bd_addr[5]); 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); RFCOMM_TRACE_DEBUG("(rfc_cb.port.rfc_mcb[i].bd_addr:%02x:%02x:%02x:%02x:%02x:%02x", rfc_cb.port.rfc_mcb[i].bd_addr[0], rfc_cb.port.rfc_mcb[i].bd_addr[1], rfc_cb.port.rfc_mcb[i].bd_addr[2], rfc_cb.port.rfc_mcb[i].bd_addr[3], rfc_cb.port.rfc_mcb[i].bd_addr[4], rfc_cb.port.rfc_mcb[i].bd_addr[5]); 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]); 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 */ memset (p_mcb, 0, sizeof (tRFC_MCB)); memcpy (p_mcb->bd_addr, bd_addr, BD_ADDR_LEN); 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); 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_EVENT ("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_EVENT ("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_EVENT ("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_EVENT ("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, tBT_TRANSPORT transport, void *p_ref_data, UINT8 res) { tPORT *p_port = (tPORT *)p_ref_data; UNUSED(bd_addr); UNUSED(transport); /* 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 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) { 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); } }