/****************************************************************************** * * 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 L2CAP interface functions * ******************************************************************************/ #include <stddef.h> #include "bt_target.h" #include "osi/include/time.h" #include "bt_common.h" #include "rfcdefs.h" #include "port_api.h" #include "port_int.h" #include "l2c_api.h" #include "l2cdefs.h" #include "rfc_int.h" #include "bt_utils.h" /* ** Define Callback functions to be called by L2CAP */ static void RFCOMM_ConnectInd (BD_ADDR bd_addr, UINT16 lcid, UINT16 psm, UINT8 id); static void RFCOMM_ConnectCnf (UINT16 lcid, UINT16 err); static void RFCOMM_ConfigInd (UINT16 lcid, tL2CAP_CFG_INFO *p_cfg); static void RFCOMM_ConfigCnf (UINT16 lcid, tL2CAP_CFG_INFO *p_cfg); static void RFCOMM_DisconnectInd (UINT16 lcid, BOOLEAN is_clear); static void RFCOMM_QoSViolationInd (BD_ADDR bd_addr); static void RFCOMM_BufDataInd (UINT16 lcid, BT_HDR *p_buf); static void RFCOMM_CongestionStatusInd (UINT16 lcid, BOOLEAN is_congested); /******************************************************************************* ** ** Function rfcomm_l2cap_if_init ** ** Description This function is called during the RFCOMM task startup ** to register interface functions with L2CAP. ** *******************************************************************************/ void rfcomm_l2cap_if_init (void) { tL2CAP_APPL_INFO *p_l2c = &rfc_cb.rfc.reg_info; p_l2c->pL2CA_ConnectInd_Cb = RFCOMM_ConnectInd; p_l2c->pL2CA_ConnectCfm_Cb = RFCOMM_ConnectCnf; p_l2c->pL2CA_ConnectPnd_Cb = NULL; p_l2c->pL2CA_ConfigInd_Cb = RFCOMM_ConfigInd; p_l2c->pL2CA_ConfigCfm_Cb = RFCOMM_ConfigCnf; p_l2c->pL2CA_DisconnectInd_Cb = RFCOMM_DisconnectInd; p_l2c->pL2CA_DisconnectCfm_Cb = NULL; p_l2c->pL2CA_QoSViolationInd_Cb = RFCOMM_QoSViolationInd; p_l2c->pL2CA_DataInd_Cb = RFCOMM_BufDataInd; p_l2c->pL2CA_CongestionStatus_Cb = RFCOMM_CongestionStatusInd; p_l2c->pL2CA_TxComplete_Cb = NULL; L2CA_Register (BT_PSM_RFCOMM, p_l2c); } /******************************************************************************* ** ** Function RFCOMM_ConnectInd ** ** Description This is a callback function called by L2CAP when ** L2CA_ConnectInd received. Allocate multiplexer control block ** and dispatch the event to it. ** *******************************************************************************/ void RFCOMM_ConnectInd (BD_ADDR bd_addr, UINT16 lcid, UINT16 psm, UINT8 id) { tRFC_MCB *p_mcb = rfc_alloc_multiplexer_channel(bd_addr, FALSE); UNUSED(psm); if ((p_mcb)&&(p_mcb->state != RFC_MX_STATE_IDLE)) { /* if this is collision case */ if ((p_mcb->is_initiator)&&(p_mcb->state == RFC_MX_STATE_WAIT_CONN_CNF)) { p_mcb->pending_lcid = lcid; p_mcb->pending_id = id; /* wait random timeout (2 - 12) to resolve collision */ /* if peer gives up then local device rejects incoming connection and continues as initiator */ /* if timeout, local device disconnects outgoing connection and continues as acceptor */ RFCOMM_TRACE_DEBUG ("RFCOMM_ConnectInd start timer for collision, initiator's LCID(0x%x), acceptor's LCID(0x%x)", p_mcb->lcid, p_mcb->pending_lcid); rfc_timer_start(p_mcb, (UINT16)(time_get_os_boottime_ms() % 10 + 2)); return; } else { /* we cannot accept connection request from peer at this state */ /* don't update lcid */ p_mcb = NULL; } } else { /* store mcb even if null */ rfc_save_lcid_mcb (p_mcb, lcid); } if (p_mcb == NULL) { L2CA_ConnectRsp (bd_addr, id, lcid, L2CAP_CONN_NO_RESOURCES, 0); return; } p_mcb->lcid = lcid; rfc_mx_sm_execute (p_mcb, RFC_MX_EVENT_CONN_IND, &id); } /******************************************************************************* ** ** Function RFCOMM_ConnectCnf ** ** Description This is a callback function called by L2CAP when ** L2CA_ConnectCnf received. Save L2CAP handle and dispatch ** event to the FSM. ** *******************************************************************************/ void RFCOMM_ConnectCnf (UINT16 lcid, UINT16 result) { tRFC_MCB *p_mcb = rfc_find_lcid_mcb (lcid); if (!p_mcb) { RFCOMM_TRACE_ERROR ("RFCOMM_ConnectCnf LCID:0x%x", lcid); return; } if (p_mcb->pending_lcid) { /* if peer rejects our connect request but peer's connect request is pending */ if (result != L2CAP_CONN_OK ) { UINT16 i; UINT8 idx; RFCOMM_TRACE_DEBUG ("RFCOMM_ConnectCnf retry as acceptor on pending LCID(0x%x)", p_mcb->pending_lcid); /* remove mcb from mapping table */ rfc_save_lcid_mcb (NULL, p_mcb->lcid); p_mcb->lcid = p_mcb->pending_lcid; p_mcb->is_initiator = FALSE; p_mcb->state = RFC_MX_STATE_IDLE; /* store mcb into mapping table */ rfc_save_lcid_mcb (p_mcb, p_mcb->lcid); /* update direction bit */ for (i = 0; i < RFCOMM_MAX_DLCI; i += 2) { if ((idx = p_mcb->port_inx[i]) != 0) { p_mcb->port_inx[i] = 0; p_mcb->port_inx[i+1] = idx; rfc_cb.port.port[idx - 1].dlci += 1; RFCOMM_TRACE_DEBUG ("RFCOMM MX - DLCI:%d -> %d", i, rfc_cb.port.port[idx - 1].dlci); } } rfc_mx_sm_execute (p_mcb, RFC_MX_EVENT_CONN_IND, &(p_mcb->pending_id)); return; } else { RFCOMM_TRACE_DEBUG ("RFCOMM_ConnectCnf peer gave up pending LCID(0x%x)", p_mcb->pending_lcid); /* Peer gave up his connection request, make sure cleaning up L2CAP channel */ L2CA_ConnectRsp (p_mcb->bd_addr, p_mcb->pending_id, p_mcb->pending_lcid, L2CAP_CONN_NO_RESOURCES, 0); p_mcb->pending_lcid = 0; } } /* Save LCID to be used in all consecutive calls to L2CAP */ p_mcb->lcid = lcid; rfc_mx_sm_execute (p_mcb, RFC_MX_EVENT_CONN_CNF, &result); } /******************************************************************************* ** ** Function RFCOMM_ConfigInd ** ** Description This is a callback function called by L2CAP when ** L2CA_ConfigInd received. Save parameters in the control ** block and dispatch event to the FSM. ** *******************************************************************************/ void RFCOMM_ConfigInd (UINT16 lcid, tL2CAP_CFG_INFO *p_cfg) { tRFC_MCB *p_mcb = rfc_find_lcid_mcb (lcid); if (!p_mcb) { RFCOMM_TRACE_ERROR ("RFCOMM_ConfigInd LCID:0x%x", lcid); return; } rfc_mx_sm_execute (p_mcb, RFC_MX_EVENT_CONF_IND, (void *)p_cfg); } /******************************************************************************* ** ** Function RFCOMM_ConfigCnf ** ** Description This is a callback function called by L2CAP when ** L2CA_ConfigCnf received. Save L2CAP handle and dispatch ** event to the FSM. ** *******************************************************************************/ void RFCOMM_ConfigCnf (UINT16 lcid, tL2CAP_CFG_INFO *p_cfg) { tRFC_MCB *p_mcb = rfc_find_lcid_mcb (lcid); if (!p_mcb) { RFCOMM_TRACE_ERROR ("RFCOMM_ConfigCnf no MCB LCID:0x%x", lcid); return; } rfc_mx_sm_execute (p_mcb, RFC_MX_EVENT_CONF_CNF, (void *)p_cfg); } /******************************************************************************* ** ** Function RFCOMM_QoSViolationInd ** ** Description This is a callback function called by L2CAP when ** L2CA_QoSViolationIndInd received. Dispatch event to the FSM. ** *******************************************************************************/ void RFCOMM_QoSViolationInd (BD_ADDR bd_addr) { UNUSED(bd_addr); } /******************************************************************************* ** ** Function RFCOMM_DisconnectInd ** ** Description This is a callback function called by L2CAP when ** L2CA_DisconnectInd received. Dispatch event to the FSM. ** *******************************************************************************/ void RFCOMM_DisconnectInd (UINT16 lcid, BOOLEAN is_conf_needed) { tRFC_MCB *p_mcb = rfc_find_lcid_mcb (lcid); if (is_conf_needed) { L2CA_DisconnectRsp (lcid); } if (!p_mcb) { RFCOMM_TRACE_WARNING ("RFCOMM_DisconnectInd LCID:0x%x", lcid); return; } rfc_mx_sm_execute (p_mcb, RFC_MX_EVENT_DISC_IND, NULL); } /******************************************************************************* ** ** Function RFCOMM_BufDataInd ** ** Description This is a callback function called by L2CAP when ** data RFCOMM frame is received. Parse the frames, check ** the checksum and dispatch event to multiplexer or port ** state machine depending on the frame destination. ** *******************************************************************************/ void RFCOMM_BufDataInd (UINT16 lcid, BT_HDR *p_buf) { tRFC_MCB *p_mcb = rfc_find_lcid_mcb (lcid); tPORT *p_port; UINT8 event; if (!p_mcb) { RFCOMM_TRACE_WARNING ("RFCOMM_BufDataInd LCID:0x%x", lcid); osi_free(p_buf); return; } event = rfc_parse_data (p_mcb, &rfc_cb.rfc.rx_frame, p_buf); /* If the frame did not pass validation just ignore it */ if (event == RFC_EVENT_BAD_FRAME) { osi_free(p_buf); return; } if (rfc_cb.rfc.rx_frame.dlci == RFCOMM_MX_DLCI) { /* Take special care of the Multiplexer Control Messages */ if (event == RFC_EVENT_UIH) { rfc_process_mx_message (p_mcb, p_buf); return; } /* Other multiplexer events go to state machine */ rfc_mx_sm_execute (p_mcb, event, NULL); osi_free(p_buf); return; } /* The frame was received on the data channel DLCI, verify that DLC exists */ if (((p_port = port_find_mcb_dlci_port (p_mcb, rfc_cb.rfc.rx_frame.dlci)) == NULL) || (!p_port->rfc.p_mcb)) { /* If this is a SABME on the new port, check if any appl is waiting for it */ if (event != RFC_EVENT_SABME) { if (( p_mcb->is_initiator && !rfc_cb.rfc.rx_frame.cr) || (!p_mcb->is_initiator && rfc_cb.rfc.rx_frame.cr)) rfc_send_dm (p_mcb, rfc_cb.rfc.rx_frame.dlci, rfc_cb.rfc.rx_frame.pf); osi_free(p_buf); return; } if ((p_port = port_find_dlci_port (rfc_cb.rfc.rx_frame.dlci)) == NULL) { rfc_send_dm (p_mcb, rfc_cb.rfc.rx_frame.dlci, TRUE); osi_free(p_buf); return; } p_mcb->port_inx[rfc_cb.rfc.rx_frame.dlci] = p_port->inx; p_port->rfc.p_mcb = p_mcb; } if (event == RFC_EVENT_UIH) { if (p_buf->len > 0) rfc_port_sm_execute (p_port, event, p_buf); else osi_free(p_buf); if (rfc_cb.rfc.rx_frame.credit != 0) rfc_inc_credit (p_port, rfc_cb.rfc.rx_frame.credit); return; } rfc_port_sm_execute (p_port, event, NULL); osi_free(p_buf); } /******************************************************************************* ** ** Function RFCOMM_CongestionStatusInd ** ** Description This is a callback function called by L2CAP when ** data RFCOMM L2CAP congestion status changes ** *******************************************************************************/ void RFCOMM_CongestionStatusInd (UINT16 lcid, BOOLEAN is_congested) { tRFC_MCB *p_mcb = rfc_find_lcid_mcb (lcid); if (!p_mcb) { RFCOMM_TRACE_ERROR ("RFCOMM_CongestionStatusInd dropped LCID:0x%x", lcid); return; } else { RFCOMM_TRACE_EVENT ("RFCOMM_CongestionStatusInd LCID:0x%x", lcid); } rfc_process_l2cap_congestion (p_mcb, is_congested); } /******************************************************************************* ** ** Function rfc_find_lcid_mcb ** ** Description This function returns MCB block supporting local cid ** *******************************************************************************/ tRFC_MCB *rfc_find_lcid_mcb (UINT16 lcid) { tRFC_MCB *p_mcb; if (lcid - L2CAP_BASE_APPL_CID >= MAX_L2CAP_CHANNELS) { RFCOMM_TRACE_ERROR ("rfc_find_lcid_mcb LCID:0x%x", lcid); return (NULL); } else { if ((p_mcb = rfc_cb.rfc.p_rfc_lcid_mcb[lcid - L2CAP_BASE_APPL_CID]) != NULL) { if (p_mcb->lcid != lcid) { RFCOMM_TRACE_WARNING ("rfc_find_lcid_mcb LCID reused LCID:0x%x current:0x%x", lcid, p_mcb->lcid); return (NULL); } } } return (p_mcb); } /******************************************************************************* ** ** Function rfc_save_lcid_mcb ** ** Description This function returns MCB block supporting local cid ** *******************************************************************************/ void rfc_save_lcid_mcb(tRFC_MCB *p_mcb, UINT16 lcid) { if (lcid < L2CAP_BASE_APPL_CID) return; rfc_cb.rfc.p_rfc_lcid_mcb[lcid - L2CAP_BASE_APPL_CID] = p_mcb; }