| /****************************************************************************** |
| * |
| * Copyright (C) 2010-2014 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 the LLCP Data Link Connection Management |
| * |
| ******************************************************************************/ |
| |
| #include <string> |
| |
| #include <android-base/stringprintf.h> |
| #include <base/logging.h> |
| |
| #include "bt_types.h" |
| #include "gki.h" |
| #include "llcp_defs.h" |
| #include "llcp_int.h" |
| #include "nfc_int.h" |
| |
| using android::base::StringPrintf; |
| |
| static tLLCP_STATUS llcp_dlsm_idle(tLLCP_DLCB* p_dlcb, tLLCP_DLC_EVENT event, |
| void* p_data); |
| static tLLCP_STATUS llcp_dlsm_w4_remote_resp(tLLCP_DLCB* p_dlcb, |
| tLLCP_DLC_EVENT event, |
| void* p_data); |
| static tLLCP_STATUS llcp_dlsm_w4_local_resp(tLLCP_DLCB* p_dlcb, |
| tLLCP_DLC_EVENT event, |
| void* p_data); |
| static tLLCP_STATUS llcp_dlsm_connected(tLLCP_DLCB* p_dlcb, |
| tLLCP_DLC_EVENT event, void* p_data); |
| static tLLCP_STATUS llcp_dlsm_w4_remote_dm(tLLCP_DLCB* p_dlcb, |
| tLLCP_DLC_EVENT event); |
| static std::string llcp_dlsm_get_state_name(tLLCP_DLC_STATE state); |
| static std::string llcp_dlsm_get_event_name(tLLCP_DLC_EVENT event); |
| |
| extern bool nfc_debug_enabled; |
| extern unsigned char appl_dta_mode_flag; |
| |
| /******************************************************************************* |
| ** |
| ** Function llcp_dlsm_execute |
| ** |
| ** Description This function executes the state machine for data link |
| ** connection. |
| ** |
| ** Returns tLLCP_STATUS |
| ** |
| *******************************************************************************/ |
| tLLCP_STATUS llcp_dlsm_execute(tLLCP_DLCB* p_dlcb, tLLCP_DLC_EVENT event, |
| void* p_data) { |
| tLLCP_STATUS status; |
| |
| DLOG_IF(INFO, nfc_debug_enabled) |
| << StringPrintf("DLC (0x%02X) - state: %s, evt: %s", p_dlcb->local_sap, |
| llcp_dlsm_get_state_name(p_dlcb->state).c_str(), |
| llcp_dlsm_get_event_name(event).c_str()); |
| |
| switch (p_dlcb->state) { |
| case LLCP_DLC_STATE_IDLE: |
| status = llcp_dlsm_idle(p_dlcb, event, p_data); |
| break; |
| |
| case LLCP_DLC_STATE_W4_REMOTE_RESP: |
| status = llcp_dlsm_w4_remote_resp(p_dlcb, event, p_data); |
| break; |
| |
| case LLCP_DLC_STATE_W4_LOCAL_RESP: |
| status = llcp_dlsm_w4_local_resp(p_dlcb, event, p_data); |
| break; |
| |
| case LLCP_DLC_STATE_CONNECTED: |
| status = llcp_dlsm_connected(p_dlcb, event, p_data); |
| break; |
| |
| case LLCP_DLC_STATE_W4_REMOTE_DM: |
| status = llcp_dlsm_w4_remote_dm(p_dlcb, event); |
| break; |
| |
| default: |
| status = LLCP_STATUS_FAIL; |
| break; |
| } |
| |
| return status; |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function llcp_dlsm_idle |
| ** |
| ** Description Data link connection is in idle state |
| ** |
| ** Returns tLLCP_STATUS |
| ** |
| *******************************************************************************/ |
| static tLLCP_STATUS llcp_dlsm_idle(tLLCP_DLCB* p_dlcb, tLLCP_DLC_EVENT event, |
| void* p_data) { |
| tLLCP_STATUS status = LLCP_STATUS_SUCCESS; |
| tLLCP_SAP_CBACK_DATA data; |
| tLLCP_CONNECTION_PARAMS* p_params; |
| |
| switch (event) { |
| case LLCP_DLC_EVENT_API_CONNECT_REQ: |
| |
| /* upper layer requests to create data link connection */ |
| p_params = (tLLCP_CONNECTION_PARAMS*)p_data; |
| |
| status = llcp_util_send_connect(p_dlcb, p_params); |
| |
| if (status == LLCP_STATUS_SUCCESS) { |
| p_dlcb->local_miu = p_params->miu; |
| p_dlcb->local_rw = p_params->rw; |
| |
| /* wait for response from peer device */ |
| p_dlcb->state = LLCP_DLC_STATE_W4_REMOTE_RESP; |
| |
| nfc_start_quick_timer(&p_dlcb->timer, NFC_TTYPE_LLCP_DATA_LINK, |
| (uint32_t)(llcp_cb.lcb.data_link_timeout * |
| QUICK_TIMER_TICKS_PER_SEC) / |
| 1000); |
| } |
| break; |
| |
| case LLCP_DLC_EVENT_PEER_CONNECT_IND: |
| |
| /* peer device requests to create data link connection */ |
| p_params = (tLLCP_CONNECTION_PARAMS*)p_data; |
| |
| if (p_params->miu > llcp_cb.lcb.peer_miu) { |
| LOG(WARNING) << StringPrintf( |
| "Peer sent data link MIU bigger than peer's " |
| "link MIU"); |
| p_params->miu = llcp_cb.lcb.peer_miu; |
| } |
| |
| data.connect_ind.event = LLCP_SAP_EVT_CONNECT_IND; |
| data.connect_ind.remote_sap = p_dlcb->remote_sap; |
| data.connect_ind.local_sap = p_dlcb->local_sap; |
| data.connect_ind.miu = p_params->miu; |
| data.connect_ind.rw = p_params->rw; |
| data.connect_ind.p_service_name = p_params->sn; |
| data.connect_ind.server_sap = p_dlcb->local_sap; |
| |
| p_dlcb->remote_miu = p_params->miu; |
| p_dlcb->remote_rw = p_params->rw; |
| |
| DLOG_IF(INFO, nfc_debug_enabled) << StringPrintf( |
| "Remote MIU:%d, RW:%d", p_dlcb->remote_miu, p_dlcb->remote_rw); |
| |
| /* wait for response from upper layer */ |
| p_dlcb->state = LLCP_DLC_STATE_W4_LOCAL_RESP; |
| |
| nfc_start_quick_timer(&p_dlcb->timer, NFC_TTYPE_LLCP_DATA_LINK, |
| (uint32_t)(llcp_cb.lcb.data_link_timeout * |
| QUICK_TIMER_TICKS_PER_SEC) / |
| 1000); |
| |
| (*p_dlcb->p_app_cb->p_app_cback)(&data); |
| |
| break; |
| |
| default: |
| LOG(ERROR) << StringPrintf("Unexpected event"); |
| status = LLCP_STATUS_FAIL; |
| break; |
| } |
| |
| return status; |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function llcp_dlsm_w4_remote_resp |
| ** |
| ** Description data link connection is waiting for connection confirm from |
| ** peer |
| ** |
| ** Returns tLLCP_STATUS |
| ** |
| *******************************************************************************/ |
| static tLLCP_STATUS llcp_dlsm_w4_remote_resp(tLLCP_DLCB* p_dlcb, |
| tLLCP_DLC_EVENT event, |
| void* p_data) { |
| tLLCP_STATUS status = LLCP_STATUS_SUCCESS; |
| tLLCP_SAP_CBACK_DATA data; |
| tLLCP_CONNECTION_PARAMS* p_params; |
| |
| switch (event) { |
| case LLCP_DLC_EVENT_PEER_CONNECT_CFM: |
| |
| /* peer device accepted data link connection */ |
| nfc_stop_quick_timer(&p_dlcb->timer); |
| |
| p_params = (tLLCP_CONNECTION_PARAMS*)p_data; |
| |
| /* data link MIU must be up to link MIU */ |
| if (p_params->miu > llcp_cb.lcb.peer_miu) { |
| LOG(WARNING) << StringPrintf( |
| "Peer sent data link MIU bigger than " |
| "peer's link MIU"); |
| p_params->miu = llcp_cb.lcb.peer_miu; |
| } |
| |
| p_dlcb->remote_miu = p_params->miu; |
| p_dlcb->remote_rw = p_params->rw; |
| |
| DLOG_IF(INFO, nfc_debug_enabled) << StringPrintf( |
| "Remote MIU:%d, RW:%d", p_dlcb->remote_miu, p_dlcb->remote_rw); |
| |
| p_dlcb->state = LLCP_DLC_STATE_CONNECTED; |
| llcp_util_adjust_dl_rx_congestion(); |
| |
| data.connect_resp.event = LLCP_SAP_EVT_CONNECT_RESP; |
| data.connect_resp.remote_sap = p_dlcb->remote_sap; |
| data.connect_resp.local_sap = p_dlcb->local_sap; |
| data.connect_resp.miu = p_params->miu; |
| data.connect_resp.rw = p_params->rw; |
| |
| (*p_dlcb->p_app_cb->p_app_cback)(&data); |
| |
| if (llcp_cb.overall_rx_congested) { |
| p_dlcb->flags |= LLCP_DATA_LINK_FLAG_PENDING_RR_RNR; |
| } |
| break; |
| |
| case LLCP_DLC_EVENT_PEER_DISCONNECT_RESP: |
| case LLCP_DLC_EVENT_TIMEOUT: |
| |
| /* peer device rejected connection or didn't respond */ |
| data.disconnect_resp.event = LLCP_SAP_EVT_DISCONNECT_RESP; |
| data.disconnect_resp.local_sap = p_dlcb->local_sap; |
| data.disconnect_resp.remote_sap = p_dlcb->remote_sap; |
| data.disconnect_resp.reason = *((uint8_t*)p_data); |
| (*p_dlcb->p_app_cb->p_app_cback)(&data); |
| |
| /* stop timer, flush any pending data in queue and deallocate control |
| * block */ |
| llcp_util_deallocate_data_link(p_dlcb); |
| |
| llcp_util_adjust_dl_rx_congestion(); |
| break; |
| |
| case LLCP_DLC_EVENT_FRAME_ERROR: |
| case LLCP_DLC_EVENT_LINK_ERROR: |
| |
| /* received bad frame or link is deactivated */ |
| data.disconnect_ind.event = LLCP_SAP_EVT_DISCONNECT_IND; |
| data.disconnect_ind.local_sap = p_dlcb->local_sap; |
| data.disconnect_ind.remote_sap = p_dlcb->remote_sap; |
| (*p_dlcb->p_app_cb->p_app_cback)(&data); |
| |
| llcp_util_deallocate_data_link(p_dlcb); |
| llcp_util_adjust_dl_rx_congestion(); |
| break; |
| |
| default: |
| LOG(ERROR) << StringPrintf("Unexpected event"); |
| status = LLCP_STATUS_FAIL; |
| break; |
| } |
| |
| return status; |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function llcp_dlsm_w4_local_resp |
| ** |
| ** Description data link connection is waiting for connection confirm from |
| ** application |
| ** |
| ** Returns tLLCP_STATUS |
| ** |
| *******************************************************************************/ |
| static tLLCP_STATUS llcp_dlsm_w4_local_resp(tLLCP_DLCB* p_dlcb, |
| tLLCP_DLC_EVENT event, |
| void* p_data) { |
| tLLCP_STATUS status = LLCP_STATUS_SUCCESS; |
| tLLCP_CONNECTION_PARAMS* p_params; |
| tLLCP_SAP_CBACK_DATA data; |
| uint8_t reason; |
| |
| switch (event) { |
| case LLCP_DLC_EVENT_API_CONNECT_CFM: |
| |
| /* upper layer accepted data link connection */ |
| nfc_stop_quick_timer(&p_dlcb->timer); |
| |
| p_params = (tLLCP_CONNECTION_PARAMS*)p_data; |
| |
| p_dlcb->local_miu = p_params->miu; |
| p_dlcb->local_rw = p_params->rw; |
| |
| p_dlcb->state = LLCP_DLC_STATE_CONNECTED; |
| |
| if (llcp_cb.overall_rx_congested) { |
| p_dlcb->flags |= LLCP_DATA_LINK_FLAG_PENDING_RR_RNR; |
| } |
| |
| status = llcp_util_send_cc(p_dlcb, p_params); |
| |
| if (status == LLCP_STATUS_SUCCESS) { |
| llcp_util_adjust_dl_rx_congestion(); |
| } else { |
| data.disconnect_ind.event = LLCP_SAP_EVT_DISCONNECT_IND; |
| data.disconnect_ind.local_sap = p_dlcb->local_sap; |
| data.disconnect_ind.remote_sap = p_dlcb->remote_sap; |
| (*p_dlcb->p_app_cb->p_app_cback)(&data); |
| |
| llcp_util_deallocate_data_link(p_dlcb); |
| } |
| break; |
| |
| case LLCP_DLC_EVENT_API_CONNECT_REJECT: |
| case LLCP_DLC_EVENT_TIMEOUT: |
| |
| if (event == LLCP_DLC_EVENT_TIMEOUT) |
| reason = LLCP_SAP_DM_REASON_TEMP_REJECT_THIS; |
| else |
| reason = *((uint8_t*)p_data); |
| |
| /* upper layer rejected connection or didn't respond */ |
| llcp_util_send_dm(p_dlcb->remote_sap, p_dlcb->local_sap, reason); |
| |
| /* stop timer, flush any pending data in queue and deallocate control |
| * block */ |
| llcp_util_deallocate_data_link(p_dlcb); |
| llcp_util_adjust_dl_rx_congestion(); |
| break; |
| |
| case LLCP_DLC_EVENT_FRAME_ERROR: |
| case LLCP_DLC_EVENT_LINK_ERROR: |
| |
| /* received bad frame or link is deactivated */ |
| data.disconnect_ind.event = LLCP_SAP_EVT_DISCONNECT_IND; |
| data.disconnect_ind.local_sap = p_dlcb->local_sap; |
| data.disconnect_ind.remote_sap = p_dlcb->remote_sap; |
| (*p_dlcb->p_app_cb->p_app_cback)(&data); |
| |
| llcp_util_deallocate_data_link(p_dlcb); |
| llcp_util_adjust_dl_rx_congestion(); |
| break; |
| |
| default: |
| LOG(ERROR) << StringPrintf("Unexpected event"); |
| status = LLCP_STATUS_FAIL; |
| break; |
| } |
| |
| return status; |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function llcp_dlsm_connected |
| ** |
| ** Description data link connection is connected |
| ** |
| ** Returns tLLCP_STATUS |
| ** |
| *******************************************************************************/ |
| static tLLCP_STATUS llcp_dlsm_connected(tLLCP_DLCB* p_dlcb, |
| tLLCP_DLC_EVENT event, void* p_data) { |
| bool flush; |
| tLLCP_STATUS status = LLCP_STATUS_SUCCESS; |
| tLLCP_SAP_CBACK_DATA data; |
| |
| switch (event) { |
| case LLCP_DLC_EVENT_API_DISCONNECT_REQ: |
| |
| /* upper layer requests to disconnect */ |
| flush = *(bool*)(p_data); |
| |
| /* |
| ** if upper layer asks to discard any pending data |
| ** or there is no pending data/ack to send and it is not waiting for ack |
| */ |
| if ((flush) || ((p_dlcb->i_xmit_q.count == 0) && |
| (p_dlcb->next_rx_seq == p_dlcb->sent_ack_seq) && |
| (p_dlcb->next_tx_seq == p_dlcb->rcvd_ack_seq))) { |
| /* wait for disconnect response */ |
| p_dlcb->state = LLCP_DLC_STATE_W4_REMOTE_DM; |
| |
| llcp_util_send_disc(p_dlcb->remote_sap, p_dlcb->local_sap); |
| |
| nfc_start_quick_timer(&p_dlcb->timer, NFC_TTYPE_LLCP_DATA_LINK, |
| (uint32_t)(llcp_cb.lcb.data_link_timeout * |
| QUICK_TIMER_TICKS_PER_SEC) / |
| 1000); |
| } else { |
| /* set flag to send DISC when tx queue is empty */ |
| p_dlcb->flags |= LLCP_DATA_LINK_FLAG_PENDING_DISC; |
| } |
| break; |
| |
| case LLCP_DLC_EVENT_PEER_DISCONNECT_IND: |
| |
| /* peer device requests to disconnect */ |
| |
| /* send disconnect response and notify upper layer */ |
| llcp_util_send_dm(p_dlcb->remote_sap, p_dlcb->local_sap, |
| LLCP_SAP_DM_REASON_RESP_DISC); |
| |
| data.disconnect_ind.event = LLCP_SAP_EVT_DISCONNECT_IND; |
| data.disconnect_ind.local_sap = p_dlcb->local_sap; |
| data.disconnect_ind.remote_sap = p_dlcb->remote_sap; |
| (*p_dlcb->p_app_cb->p_app_cback)(&data); |
| |
| llcp_util_deallocate_data_link(p_dlcb); |
| llcp_util_adjust_dl_rx_congestion(); |
| break; |
| |
| case LLCP_DLC_EVENT_API_DATA_REQ: |
| |
| /* upper layer requests to send data */ |
| |
| /* if peer device can receive data */ |
| if (p_dlcb->remote_rw) { |
| /* enqueue data and check if data can be sent */ |
| GKI_enqueue(&p_dlcb->i_xmit_q, p_data); |
| llcp_cb.total_tx_i_pdu++; |
| |
| llcp_link_check_send_data(); |
| |
| if ((p_dlcb->is_tx_congested) || (llcp_cb.overall_tx_congested) || |
| (p_dlcb->remote_busy) || |
| (p_dlcb->i_xmit_q.count >= |
| p_dlcb->remote_rw)) /*if enough data to send next round */ |
| { |
| DLOG_IF(INFO, nfc_debug_enabled) << StringPrintf( |
| "Data link (SSAP:DSAP=0x%X:0x%X) " |
| "congested: xmit_q.count=%d", |
| p_dlcb->local_sap, p_dlcb->remote_sap, p_dlcb->i_xmit_q.count); |
| |
| /* set congested here so overall congestion check routine will not |
| * report event again */ |
| p_dlcb->is_tx_congested = true; |
| status = LLCP_STATUS_CONGESTED; |
| } |
| } else { |
| LOG(ERROR) << StringPrintf("Remote RW is zero: discard data"); |
| /* buffer will be freed when returned to API function */ |
| status = LLCP_STATUS_FAIL; |
| } |
| break; |
| |
| case LLCP_DLC_EVENT_PEER_DATA_IND: |
| /* peer device sends data so notify upper layer to read data from data |
| * link connection */ |
| |
| data.data_ind.event = LLCP_SAP_EVT_DATA_IND; |
| data.data_ind.local_sap = p_dlcb->local_sap; |
| data.data_ind.link_type = LLCP_LINK_TYPE_DATA_LINK_CONNECTION; |
| data.data_ind.remote_sap = p_dlcb->remote_sap; |
| |
| (*p_dlcb->p_app_cb->p_app_cback)(&data); |
| break; |
| |
| case LLCP_DLC_EVENT_FRAME_ERROR: |
| case LLCP_DLC_EVENT_LINK_ERROR: |
| |
| /* received bad frame or link is deactivated */ |
| data.disconnect_ind.event = LLCP_SAP_EVT_DISCONNECT_IND; |
| data.disconnect_ind.local_sap = p_dlcb->local_sap; |
| data.disconnect_ind.remote_sap = p_dlcb->remote_sap; |
| (*p_dlcb->p_app_cb->p_app_cback)(&data); |
| |
| llcp_util_deallocate_data_link(p_dlcb); |
| llcp_util_adjust_dl_rx_congestion(); |
| break; |
| |
| default: |
| LOG(ERROR) << StringPrintf("Unexpected event"); |
| status = LLCP_STATUS_FAIL; |
| break; |
| } |
| |
| return status; |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function llcp_dlsm_w4_remote_dm |
| ** |
| ** Description data link connection is waiting for disconnection confirm |
| ** from peer |
| ** |
| ** Returns tLLCP_STATUS |
| ** |
| *******************************************************************************/ |
| static tLLCP_STATUS llcp_dlsm_w4_remote_dm(tLLCP_DLCB* p_dlcb, |
| tLLCP_DLC_EVENT event) { |
| tLLCP_STATUS status = LLCP_STATUS_SUCCESS; |
| tLLCP_SAP_CBACK_DATA data; |
| |
| switch (event) { |
| case LLCP_DLC_EVENT_PEER_DISCONNECT_RESP: |
| case LLCP_DLC_EVENT_TIMEOUT: |
| |
| /* peer device sends disconnect response or didn't responde */ |
| data.disconnect_resp.event = LLCP_SAP_EVT_DISCONNECT_RESP; |
| data.disconnect_resp.local_sap = p_dlcb->local_sap; |
| data.disconnect_resp.remote_sap = p_dlcb->remote_sap; |
| data.disconnect_resp.reason = LLCP_SAP_DM_REASON_RESP_DISC; |
| (*p_dlcb->p_app_cb->p_app_cback)(&data); |
| |
| llcp_util_deallocate_data_link(p_dlcb); |
| llcp_util_adjust_dl_rx_congestion(); |
| break; |
| |
| case LLCP_DLC_EVENT_FRAME_ERROR: |
| case LLCP_DLC_EVENT_LINK_ERROR: |
| |
| /* received bad frame or link is deactivated */ |
| data.disconnect_ind.event = LLCP_SAP_EVT_DISCONNECT_IND; |
| data.disconnect_ind.local_sap = p_dlcb->local_sap; |
| data.disconnect_ind.remote_sap = p_dlcb->remote_sap; |
| (*p_dlcb->p_app_cb->p_app_cback)(&data); |
| |
| llcp_util_deallocate_data_link(p_dlcb); |
| llcp_util_adjust_dl_rx_congestion(); |
| break; |
| |
| case LLCP_DLC_EVENT_PEER_DATA_IND: |
| break; |
| |
| case LLCP_DLC_EVENT_PEER_DISCONNECT_IND: |
| /* it's race condition, send disconnect response and wait for DM */ |
| llcp_util_send_dm(p_dlcb->remote_sap, p_dlcb->local_sap, |
| LLCP_SAP_DM_REASON_RESP_DISC); |
| break; |
| |
| default: |
| LOG(ERROR) << StringPrintf("Unexpected event"); |
| status = LLCP_STATUS_FAIL; |
| break; |
| } |
| |
| return status; |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function llcp_dlc_find_dlcb_by_local_sap |
| ** |
| ** Description Find tLLCP_DLCB by local SAP and remote SAP |
| ** if remote_sap is LLCP_INVALID_SAP, it will return a DLCB |
| ** which is waiting for CC from peer. |
| ** |
| ** Returns tLLCP_DLCB * |
| ** |
| *******************************************************************************/ |
| tLLCP_DLCB* llcp_dlc_find_dlcb_by_sap(uint8_t local_sap, uint8_t remote_sap) { |
| int i; |
| |
| for (i = 0; i < LLCP_MAX_DATA_LINK; i++) { |
| if ((llcp_cb.dlcb[i].state != LLCP_DLC_STATE_IDLE) && |
| (llcp_cb.dlcb[i].local_sap == local_sap)) { |
| if ((remote_sap == LLCP_INVALID_SAP) && |
| (llcp_cb.dlcb[i].state == LLCP_DLC_STATE_W4_REMOTE_RESP)) { |
| /* Remote SAP has not been finalized because we are watiing for CC */ |
| return (&llcp_cb.dlcb[i]); |
| } else if (llcp_cb.dlcb[i].remote_sap == remote_sap) { |
| return (&llcp_cb.dlcb[i]); |
| } |
| } |
| } |
| return NULL; |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function llcp_dlc_flush_q |
| ** |
| ** Description Free buffers in tx and rx queue in data link |
| ** |
| ** Returns void |
| ** |
| *******************************************************************************/ |
| void llcp_dlc_flush_q(tLLCP_DLCB* p_dlcb) { |
| if (p_dlcb) { |
| DLOG_IF(INFO, nfc_debug_enabled) |
| << StringPrintf("local SAP:0x%02X", p_dlcb->local_sap); |
| |
| /* Release any held buffers */ |
| while (p_dlcb->i_xmit_q.p_first) { |
| GKI_freebuf(GKI_dequeue(&p_dlcb->i_xmit_q)); |
| llcp_cb.total_tx_i_pdu--; |
| } |
| |
| /* discard any received I PDU on data link including in AGF */ |
| LLCP_FlushDataLinkRxData(p_dlcb->local_sap, p_dlcb->remote_sap); |
| } else { |
| LOG(ERROR) << StringPrintf("p_dlcb is NULL"); |
| } |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function llcp_dlc_proc_connect_pdu |
| ** |
| ** Description Process CONNECT PDU |
| ** |
| ** Returns void |
| ** |
| *******************************************************************************/ |
| static void llcp_dlc_proc_connect_pdu(uint8_t dsap, uint8_t ssap, |
| uint16_t length, uint8_t* p_data) { |
| tLLCP_DLCB* p_dlcb; |
| tLLCP_STATUS status; |
| tLLCP_APP_CB* p_app_cb; |
| |
| tLLCP_CONNECTION_PARAMS params; |
| |
| DLOG_IF(INFO, nfc_debug_enabled) << __func__; |
| |
| p_app_cb = llcp_util_get_app_cb(dsap); |
| |
| if ((p_app_cb == NULL) || (p_app_cb->p_app_cback == NULL) || |
| ((p_app_cb->link_type & LLCP_LINK_TYPE_DATA_LINK_CONNECTION) == 0)) { |
| LOG(ERROR) << StringPrintf("Unregistered SAP:0x%x", dsap); |
| llcp_util_send_dm(ssap, dsap, LLCP_SAP_DM_REASON_NO_SERVICE); |
| return; |
| } |
| |
| /* parse CONNECT PDU and get connection parameters */ |
| if (llcp_util_parse_connect(p_data, length, ¶ms) != LLCP_STATUS_SUCCESS) { |
| LOG(ERROR) << StringPrintf("Bad format CONNECT"); |
| /* fix to pass TC_CTO_TAR_BI_02_x (x=5) test case |
| * As per the LLCP test specification v1.2.00 by receiving erroneous SNL PDU |
| * i'e with improper length and service name "urn:nfc:sn:dta-co-echo-in", |
| * the IUT should not send any PDU except SYMM PDU */ |
| |
| if (appl_dta_mode_flag == 1 && |
| p_data[1] == strlen((const char*)&p_data[2])) { |
| DLOG_IF(INFO, nfc_debug_enabled) |
| << StringPrintf("%s: Strings are not equal", __func__); |
| llcp_util_send_dm(ssap, dsap, LLCP_SAP_DM_REASON_NO_SERVICE); |
| } else { |
| llcp_util_send_dm(ssap, dsap, LLCP_SAP_DM_REASON_NO_SERVICE); |
| } |
| return; |
| } |
| |
| /* if this is connection by service name */ |
| if (dsap == LLCP_SAP_SDP) { |
| /* find registered SAP with service name */ |
| if (strlen(params.sn)) |
| dsap = llcp_sdp_get_sap_by_name(params.sn, (uint8_t)strlen(params.sn)); |
| else { |
| /* if SN type is included without SN */ |
| if (params.sn[1] == LLCP_SN_TYPE) { |
| llcp_util_send_dm(ssap, LLCP_SAP_SDP, LLCP_SAP_DM_REASON_NO_SERVICE); |
| } else { |
| /* SDP doesn't accept connection */ |
| llcp_util_send_dm(ssap, LLCP_SAP_SDP, |
| LLCP_SAP_DM_REASON_PERM_REJECT_THIS); |
| } |
| return; |
| } |
| |
| if (dsap == LLCP_SAP_SDP) { |
| LOG(ERROR) << StringPrintf("SDP doesn't accept connection"); |
| |
| llcp_util_send_dm(ssap, LLCP_SAP_SDP, |
| LLCP_SAP_DM_REASON_PERM_REJECT_THIS); |
| return; |
| } else if (dsap == 0) { |
| LOG(ERROR) << StringPrintf("Unregistered Service:%s", params.sn); |
| |
| llcp_util_send_dm(ssap, LLCP_SAP_SDP, LLCP_SAP_DM_REASON_NO_SERVICE); |
| return; |
| } else { |
| /* check if this application can support connection-oriented transport */ |
| p_app_cb = llcp_util_get_app_cb(dsap); |
| |
| if ((p_app_cb == NULL) || (p_app_cb->p_app_cback == NULL) || |
| ((p_app_cb->link_type & LLCP_LINK_TYPE_DATA_LINK_CONNECTION) == 0)) { |
| LOG(ERROR) << StringPrintf( |
| "SAP(0x%x) doesn't support " |
| "connection-oriented", |
| dsap); |
| llcp_util_send_dm(ssap, dsap, LLCP_SAP_DM_REASON_NO_SERVICE); |
| return; |
| } |
| } |
| } |
| |
| /* check if any data link */ |
| p_dlcb = llcp_dlc_find_dlcb_by_sap(dsap, ssap); |
| if (p_dlcb) { |
| LOG(ERROR) << StringPrintf("Data link is aleady established"); |
| llcp_util_send_dm(ssap, dsap, LLCP_SAP_DM_REASON_TEMP_REJECT_THIS); |
| } else { |
| /* allocate data link connection control block and notify upper layer |
| * through state machine */ |
| p_dlcb = llcp_util_allocate_data_link(dsap, ssap); |
| |
| if (p_dlcb) { |
| status = |
| llcp_dlsm_execute(p_dlcb, LLCP_DLC_EVENT_PEER_CONNECT_IND, ¶ms); |
| if (status != LLCP_STATUS_SUCCESS) { |
| LOG(ERROR) << StringPrintf("Error in state machine"); |
| llcp_util_deallocate_data_link(p_dlcb); |
| } |
| } else { |
| LOG(ERROR) << StringPrintf("Out of resource"); |
| llcp_util_send_dm(ssap, dsap, LLCP_SAP_DM_REASON_TEMP_REJECT_ANY); |
| } |
| } |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function llcp_dlc_proc_disc_pdu |
| ** |
| ** Description Process DISC PDU |
| ** |
| ** Returns void |
| ** |
| *******************************************************************************/ |
| static void llcp_dlc_proc_disc_pdu(uint8_t dsap, uint8_t ssap, |
| uint16_t length) { |
| tLLCP_DLCB* p_dlcb; |
| |
| DLOG_IF(INFO, nfc_debug_enabled) << __func__; |
| |
| p_dlcb = llcp_dlc_find_dlcb_by_sap(dsap, ssap); |
| if (p_dlcb) { |
| if (length > 0) { |
| LOG(ERROR) << StringPrintf( |
| "Received extra data (%d bytes) in DISC " |
| "PDU", |
| length); |
| |
| llcp_util_send_frmr(p_dlcb, |
| LLCP_FRMR_W_ERROR_FLAG | LLCP_FRMR_I_ERROR_FLAG, |
| LLCP_PDU_DISC_TYPE, 0); |
| llcp_dlsm_execute(p_dlcb, LLCP_DLC_EVENT_FRAME_ERROR, NULL); |
| } else { |
| llcp_dlsm_execute(p_dlcb, LLCP_DLC_EVENT_PEER_DISCONNECT_IND, NULL); |
| } |
| } else { |
| LOG(ERROR) << StringPrintf("No data link for SAP (0x%x,0x%x)", dsap, ssap); |
| } |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function llcp_dlc_proc_cc_pdu |
| ** |
| ** Description Process CC PDU |
| ** |
| ** Returns void |
| ** |
| *******************************************************************************/ |
| static void llcp_dlc_proc_cc_pdu(uint8_t dsap, uint8_t ssap, uint16_t length, |
| uint8_t* p_data) { |
| tLLCP_DLCB* p_dlcb; |
| tLLCP_CONNECTION_PARAMS params; |
| tLLCP_STATUS status; |
| |
| DLOG_IF(INFO, nfc_debug_enabled) << __func__; |
| |
| /* find a DLCB waiting for CC on this local SAP */ |
| p_dlcb = llcp_dlc_find_dlcb_by_sap(dsap, LLCP_INVALID_SAP); |
| if (p_dlcb) { |
| /* The CC may contain a SSAP that is different from the DSAP in the CONNECT |
| */ |
| p_dlcb->remote_sap = ssap; |
| |
| if (llcp_util_parse_cc(p_data, length, &(params.miu), &(params.rw)) == |
| LLCP_STATUS_SUCCESS) { |
| status = |
| llcp_dlsm_execute(p_dlcb, LLCP_DLC_EVENT_PEER_CONNECT_CFM, ¶ms); |
| if (status != LLCP_STATUS_SUCCESS) { |
| LOG(ERROR) << StringPrintf("Error in state machine"); |
| llcp_util_deallocate_data_link(p_dlcb); |
| } |
| } else { |
| llcp_util_send_frmr(p_dlcb, |
| LLCP_FRMR_W_ERROR_FLAG | LLCP_FRMR_I_ERROR_FLAG, |
| LLCP_PDU_DISC_TYPE, 0); |
| llcp_dlsm_execute(p_dlcb, LLCP_DLC_EVENT_FRAME_ERROR, NULL); |
| } |
| } else { |
| LOG(ERROR) << StringPrintf("No data link for SAP (0x%x,0x%x)", dsap, ssap); |
| } |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function llcp_dlc_proc_dm_pdu |
| ** |
| ** Description Process DM PDU |
| ** |
| ** Returns void |
| ** |
| *******************************************************************************/ |
| static void llcp_dlc_proc_dm_pdu(uint8_t dsap, uint8_t ssap, uint16_t length, |
| uint8_t* p_data) { |
| tLLCP_DLCB* p_dlcb; |
| |
| DLOG_IF(INFO, nfc_debug_enabled) << __func__; |
| |
| if (length != LLCP_PDU_DM_SIZE - LLCP_PDU_HEADER_SIZE) { |
| LOG(ERROR) << StringPrintf("Received invalid DM PDU"); |
| } else { |
| if (*p_data == LLCP_SAP_DM_REASON_RESP_DISC) { |
| /* local device initiated disconnecting */ |
| p_dlcb = llcp_dlc_find_dlcb_by_sap(dsap, ssap); |
| } else { |
| /* peer device rejected connection with any reason */ |
| /* find a DLCB waiting for CC on this local SAP */ |
| p_dlcb = llcp_dlc_find_dlcb_by_sap(dsap, LLCP_INVALID_SAP); |
| } |
| |
| if (p_dlcb) { |
| llcp_dlsm_execute(p_dlcb, LLCP_DLC_EVENT_PEER_DISCONNECT_RESP, |
| p_data); /* passing reason */ |
| } else { |
| LOG(ERROR) << StringPrintf("No data link for SAP (0x%x,0x%x)", dsap, |
| ssap); |
| } |
| } |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function llcp_dlc_proc_i_pdu |
| ** |
| ** Description Process I PDU |
| ** |
| ** Returns void |
| ** |
| *******************************************************************************/ |
| void llcp_dlc_proc_i_pdu(uint8_t dsap, uint8_t ssap, uint16_t i_pdu_length, |
| uint8_t* p_i_pdu, NFC_HDR* p_msg) { |
| uint8_t *p, *p_dst, send_seq, rcv_seq, error_flags; |
| uint16_t info_len, available_bytes; |
| tLLCP_DLCB* p_dlcb; |
| bool appended; |
| NFC_HDR* p_last_buf; |
| |
| DLOG_IF(INFO, nfc_debug_enabled) << __func__; |
| |
| p_dlcb = llcp_dlc_find_dlcb_by_sap(dsap, ssap); |
| |
| if ((p_dlcb) && (p_dlcb->state == LLCP_DLC_STATE_CONNECTED)) { |
| error_flags = 0; |
| |
| if (p_msg) { |
| i_pdu_length = p_msg->len; |
| p_i_pdu = (uint8_t*)(p_msg + 1) + p_msg->offset; |
| } |
| |
| info_len = i_pdu_length - LLCP_PDU_HEADER_SIZE - LLCP_SEQUENCE_SIZE; |
| |
| if (info_len > p_dlcb->local_miu) { |
| LOG(ERROR) << StringPrintf( |
| "exceeding local MIU (%d bytes): got %d " |
| "bytes SDU", |
| p_dlcb->local_miu, info_len); |
| |
| error_flags |= LLCP_FRMR_I_ERROR_FLAG; |
| } |
| |
| /* get sequence numbers */ |
| p = p_i_pdu + LLCP_PDU_HEADER_SIZE; |
| |
| send_seq = LLCP_GET_NS(*p); |
| rcv_seq = LLCP_GET_NR(*p); |
| |
| DLOG_IF(INFO, nfc_debug_enabled) << StringPrintf( |
| "LLCP RX I PDU - N(S,R):(%d,%d) V(S,SA,R,RA):(%d,%d,%d,%d)", send_seq, |
| rcv_seq, p_dlcb->next_tx_seq, p_dlcb->rcvd_ack_seq, p_dlcb->next_rx_seq, |
| p_dlcb->sent_ack_seq); |
| |
| /* if send sequence number, N(S) is not expected one, V(R) */ |
| if (p_dlcb->next_rx_seq != send_seq) { |
| LOG(ERROR) << StringPrintf("Bad N(S) got:%d, expected:%d", send_seq, |
| p_dlcb->next_rx_seq); |
| |
| error_flags |= LLCP_FRMR_S_ERROR_FLAG; |
| } else { |
| /* if peer device sends more than our receiving window size */ |
| if ((uint8_t)(send_seq - p_dlcb->sent_ack_seq) % LLCP_SEQ_MODULO >= |
| p_dlcb->local_rw) { |
| LOG(ERROR) << StringPrintf("Bad N(S):%d >= V(RA):%d + RW(L):%d", |
| send_seq, p_dlcb->sent_ack_seq, |
| p_dlcb->local_rw); |
| |
| error_flags |= LLCP_FRMR_S_ERROR_FLAG; |
| } |
| } |
| |
| /* check N(R) is in valid range; V(SA) <= N(R) <= V(S) */ |
| if ((uint8_t)(rcv_seq - p_dlcb->rcvd_ack_seq) % LLCP_SEQ_MODULO + |
| (uint8_t)(p_dlcb->next_tx_seq - rcv_seq) % LLCP_SEQ_MODULO != |
| (uint8_t)(p_dlcb->next_tx_seq - p_dlcb->rcvd_ack_seq) % |
| LLCP_SEQ_MODULO) { |
| error_flags |= LLCP_FRMR_R_ERROR_FLAG; |
| LOG(ERROR) << StringPrintf("Bad N(R):%d valid range [V(SA):%d, V(S):%d]", |
| rcv_seq, p_dlcb->rcvd_ack_seq, |
| p_dlcb->next_tx_seq); |
| } |
| |
| /* if any error is found */ |
| if (error_flags) { |
| llcp_util_send_frmr(p_dlcb, error_flags, LLCP_PDU_I_TYPE, *p); |
| llcp_dlsm_execute(p_dlcb, LLCP_DLC_EVENT_FRAME_ERROR, NULL); |
| } else { |
| /* update local sequence variables */ |
| p_dlcb->next_rx_seq = (p_dlcb->next_rx_seq + 1) % LLCP_SEQ_MODULO; |
| p_dlcb->rcvd_ack_seq = rcv_seq; |
| |
| appended = false; |
| |
| /* get last buffer in rx queue */ |
| p_last_buf = (NFC_HDR*)GKI_getlast(&p_dlcb->i_rx_q); |
| |
| if (p_last_buf) { |
| /* get max length to append at the end of buffer */ |
| available_bytes = GKI_get_buf_size(p_last_buf) - NFC_HDR_SIZE - |
| p_last_buf->offset - p_last_buf->len; |
| |
| /* if new UI PDU with length can be attached at the end of buffer */ |
| if (available_bytes >= LLCP_PDU_AGF_LEN_SIZE + info_len) { |
| p_dst = |
| (uint8_t*)(p_last_buf + 1) + p_last_buf->offset + p_last_buf->len; |
| |
| /* add length of information in I PDU */ |
| UINT16_TO_BE_STREAM(p_dst, info_len); |
| |
| /* copy information of I PDU */ |
| p = p_i_pdu + LLCP_PDU_HEADER_SIZE + LLCP_SEQUENCE_SIZE; |
| |
| memcpy(p_dst, p, info_len); |
| |
| p_last_buf->len += LLCP_PDU_AGF_LEN_SIZE + info_len; |
| |
| if (p_msg) { |
| GKI_freebuf(p_msg); |
| p_msg = NULL; |
| } |
| |
| appended = true; |
| } |
| } |
| |
| /* if it is not available to append */ |
| if (!appended) { |
| /* if it's not from AGF PDU */ |
| if (p_msg) { |
| /* add length of information in front of information */ |
| p = p_i_pdu + LLCP_PDU_HEADER_SIZE + LLCP_SEQUENCE_SIZE - |
| LLCP_PDU_AGF_LEN_SIZE; |
| UINT16_TO_BE_STREAM(p, info_len); |
| |
| p_msg->offset += |
| LLCP_PDU_HEADER_SIZE + LLCP_SEQUENCE_SIZE - LLCP_PDU_AGF_LEN_SIZE; |
| p_msg->len -= |
| LLCP_PDU_HEADER_SIZE + LLCP_SEQUENCE_SIZE - LLCP_PDU_AGF_LEN_SIZE; |
| p_msg->layer_specific = 0; |
| } else { |
| p_msg = (NFC_HDR*)GKI_getpoolbuf(LLCP_POOL_ID); |
| |
| if (p_msg) { |
| p_dst = (uint8_t*)(p_msg + 1); |
| |
| /* add length of information in front of information */ |
| UINT16_TO_BE_STREAM(p_dst, info_len); |
| |
| p = p_i_pdu + LLCP_PDU_HEADER_SIZE + LLCP_SEQUENCE_SIZE; |
| memcpy(p_dst, p, info_len); |
| |
| p_msg->offset = 0; |
| p_msg->len = LLCP_PDU_AGF_LEN_SIZE + info_len; |
| p_msg->layer_specific = 0; |
| } else { |
| LOG(ERROR) << StringPrintf("out of buffer"); |
| } |
| } |
| |
| /* insert I PDU in rx queue */ |
| if (p_msg) { |
| GKI_enqueue(&p_dlcb->i_rx_q, p_msg); |
| p_msg = NULL; |
| llcp_cb.total_rx_i_pdu++; |
| |
| llcp_util_check_rx_congested_status(); |
| } |
| } |
| |
| p_dlcb->num_rx_i_pdu++; |
| |
| if ((!p_dlcb->local_busy) && (p_dlcb->num_rx_i_pdu == 1)) { |
| /* notify rx data is available so upper layer reads data until queue is |
| * empty */ |
| llcp_dlsm_execute(p_dlcb, LLCP_DLC_EVENT_PEER_DATA_IND, NULL); |
| } |
| |
| if ((!p_dlcb->is_rx_congested) && |
| (p_dlcb->num_rx_i_pdu >= p_dlcb->rx_congest_threshold)) { |
| DLOG_IF(INFO, nfc_debug_enabled) << StringPrintf( |
| "congested num_rx_i_pdu=%d, " |
| "rx_congest_threshold=%d", |
| p_dlcb->num_rx_i_pdu, p_dlcb->rx_congest_threshold); |
| |
| /* send RNR */ |
| p_dlcb->is_rx_congested = true; |
| p_dlcb->flags |= LLCP_DATA_LINK_FLAG_PENDING_RR_RNR; |
| } |
| } |
| } else { |
| LOG(ERROR) << StringPrintf("No data link for SAP (0x%x,0x%x)", dsap, ssap); |
| llcp_util_send_dm(ssap, dsap, LLCP_SAP_DM_REASON_NO_ACTIVE_CONNECTION); |
| } |
| |
| if (p_msg) { |
| GKI_freebuf(p_msg); |
| } |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function llcp_dlc_proc_rr_rnr_pdu |
| ** |
| ** Description Process RR or RNR PDU |
| ** |
| ** Returns void |
| ** |
| *******************************************************************************/ |
| static void llcp_dlc_proc_rr_rnr_pdu(uint8_t dsap, uint8_t ptype, uint8_t ssap, |
| uint16_t length, uint8_t* p_data) { |
| uint8_t rcv_seq, error_flags; |
| tLLCP_DLCB* p_dlcb; |
| bool flush = true; |
| tLLCP_SAP_CBACK_DATA cback_data; |
| bool old_remote_busy; |
| |
| DLOG_IF(INFO, nfc_debug_enabled) << __func__; |
| |
| p_dlcb = llcp_dlc_find_dlcb_by_sap(dsap, ssap); |
| if (p_dlcb != NULL) { |
| error_flags = 0; |
| |
| rcv_seq = LLCP_GET_NR(*p_data); |
| |
| if (length != LLCP_PDU_RR_SIZE - LLCP_PDU_HEADER_SIZE) { |
| error_flags |= LLCP_FRMR_W_ERROR_FLAG | LLCP_FRMR_I_ERROR_FLAG; |
| } |
| |
| /* check N(R) is in valid range; V(SA) <= N(R) <= V(S) */ |
| if ((uint8_t)(rcv_seq - p_dlcb->rcvd_ack_seq) % LLCP_SEQ_MODULO + |
| (uint8_t)(p_dlcb->next_tx_seq - rcv_seq) % LLCP_SEQ_MODULO != |
| (uint8_t)(p_dlcb->next_tx_seq - p_dlcb->rcvd_ack_seq) % |
| LLCP_SEQ_MODULO) { |
| error_flags |= LLCP_FRMR_R_ERROR_FLAG; |
| LOG(ERROR) << StringPrintf( |
| "Bad N(R):%d valid range [V(SA):%d, " |
| "V(S):%d]", |
| rcv_seq, p_dlcb->rcvd_ack_seq, p_dlcb->next_tx_seq); |
| } |
| |
| if (error_flags) { |
| llcp_util_send_frmr(p_dlcb, error_flags, ptype, *p_data); |
| llcp_dlsm_execute(p_dlcb, LLCP_DLC_EVENT_FRAME_ERROR, NULL); |
| } else { |
| p_dlcb->rcvd_ack_seq = rcv_seq; |
| |
| DLOG_IF(INFO, nfc_debug_enabled) |
| << StringPrintf("LLCP RX - N(S,R):(NA,%d) V(S,SA,R,RA):(%d,%d,%d,%d)", |
| rcv_seq, p_dlcb->next_tx_seq, p_dlcb->rcvd_ack_seq, |
| p_dlcb->next_rx_seq, p_dlcb->sent_ack_seq); |
| old_remote_busy = p_dlcb->remote_busy; |
| if (ptype == LLCP_PDU_RNR_TYPE) { |
| p_dlcb->remote_busy = true; |
| /* if upper layer hasn't get congestion started notification */ |
| if ((!old_remote_busy) && (!p_dlcb->is_tx_congested)) { |
| LOG(WARNING) << StringPrintf( |
| "Data link (SSAP:DSAP=0x%X:0x%X) " |
| "congestion start: i_xmit_q.count=%d", |
| p_dlcb->local_sap, p_dlcb->remote_sap, p_dlcb->i_xmit_q.count); |
| |
| cback_data.congest.event = LLCP_SAP_EVT_CONGEST; |
| cback_data.congest.local_sap = p_dlcb->local_sap; |
| cback_data.congest.remote_sap = p_dlcb->remote_sap; |
| cback_data.congest.is_congested = true; |
| cback_data.congest.link_type = LLCP_LINK_TYPE_DATA_LINK_CONNECTION; |
| |
| (*p_dlcb->p_app_cb->p_app_cback)(&cback_data); |
| } |
| } else { |
| p_dlcb->remote_busy = false; |
| /* if upper layer hasn't get congestion ended notification and data link |
| * is not congested */ |
| if ((old_remote_busy) && (!p_dlcb->is_tx_congested)) { |
| LOG(WARNING) << StringPrintf( |
| "Data link (SSAP:DSAP=0x%X:0x%X) " |
| "congestion end: i_xmit_q.count=%d", |
| p_dlcb->local_sap, p_dlcb->remote_sap, p_dlcb->i_xmit_q.count); |
| |
| cback_data.congest.event = LLCP_SAP_EVT_CONGEST; |
| cback_data.congest.local_sap = p_dlcb->local_sap; |
| cback_data.congest.remote_sap = p_dlcb->remote_sap; |
| cback_data.congest.is_congested = false; |
| cback_data.congest.link_type = LLCP_LINK_TYPE_DATA_LINK_CONNECTION; |
| |
| (*p_dlcb->p_app_cb->p_app_cback)(&cback_data); |
| } |
| } |
| |
| /* check flag to send DISC when tx queue is empty */ |
| if (p_dlcb->flags & LLCP_DATA_LINK_FLAG_PENDING_DISC) { |
| /* if no pending data and all PDU is acked */ |
| if ((p_dlcb->i_xmit_q.count == 0) && |
| (p_dlcb->next_rx_seq == p_dlcb->sent_ack_seq) && |
| (p_dlcb->next_tx_seq == p_dlcb->rcvd_ack_seq)) { |
| p_dlcb->flags &= ~LLCP_DATA_LINK_FLAG_PENDING_DISC; |
| llcp_dlsm_execute(p_dlcb, LLCP_DLC_EVENT_API_DISCONNECT_REQ, &flush); |
| } |
| } |
| } |
| } else { |
| LOG(ERROR) << StringPrintf("No data link for SAP (0x%x,0x%x)", dsap, ssap); |
| } |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function llcp_dlc_proc_rx_pdu |
| ** |
| ** Description Process PDU for data link |
| ** |
| ** Returns void |
| ** |
| *******************************************************************************/ |
| void llcp_dlc_proc_rx_pdu(uint8_t dsap, uint8_t ptype, uint8_t ssap, |
| uint16_t length, uint8_t* p_data) { |
| tLLCP_DLCB* p_dlcb; |
| |
| DLOG_IF(INFO, nfc_debug_enabled) |
| << StringPrintf("DSAP:0x%x, PTYPE:0x%x, SSAP:0x%x", dsap, ptype, ssap); |
| |
| if (dsap == LLCP_SAP_LM) { |
| LOG(ERROR) << StringPrintf("Invalid SAP:0x%x for PTYPE:0x%x", dsap, ptype); |
| return; |
| } |
| |
| switch (ptype) { |
| case LLCP_PDU_CONNECT_TYPE: |
| llcp_dlc_proc_connect_pdu(dsap, ssap, length, p_data); |
| break; |
| |
| case LLCP_PDU_DISC_TYPE: |
| llcp_dlc_proc_disc_pdu(dsap, ssap, length); |
| break; |
| |
| case LLCP_PDU_CC_TYPE: |
| llcp_dlc_proc_cc_pdu(dsap, ssap, length, p_data); |
| break; |
| |
| case LLCP_PDU_DM_TYPE: |
| llcp_dlc_proc_dm_pdu(dsap, ssap, length, p_data); |
| break; |
| |
| case LLCP_PDU_FRMR_TYPE: |
| p_dlcb = llcp_dlc_find_dlcb_by_sap(dsap, ssap); |
| if (p_dlcb) { |
| llcp_dlsm_execute(p_dlcb, LLCP_DLC_EVENT_FRAME_ERROR, NULL); |
| } |
| break; |
| |
| case LLCP_PDU_RR_TYPE: |
| case LLCP_PDU_RNR_TYPE: |
| llcp_dlc_proc_rr_rnr_pdu(dsap, ptype, ssap, length, p_data); |
| break; |
| |
| default: |
| LOG(ERROR) << StringPrintf("Unexpected PDU type (0x%x)", ptype); |
| |
| p_dlcb = llcp_dlc_find_dlcb_by_sap(dsap, ssap); |
| if (p_dlcb) { |
| llcp_util_send_frmr(p_dlcb, LLCP_FRMR_W_ERROR_FLAG, ptype, 0); |
| llcp_dlsm_execute(p_dlcb, LLCP_DLC_EVENT_FRAME_ERROR, NULL); |
| } |
| break; |
| } |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function llcp_dlc_check_to_send_rr_rnr |
| ** |
| ** Description Send RR or RNR if necessary |
| ** |
| ** Returns void |
| ** |
| *******************************************************************************/ |
| void llcp_dlc_check_to_send_rr_rnr(void) { |
| uint8_t idx; |
| bool flush = true; |
| |
| DLOG_IF(INFO, nfc_debug_enabled) << __func__; |
| |
| /* |
| ** DLC doesn't send RR PDU for each received I PDU because multiple I PDUs |
| ** can be aggregated in a received AGF PDU. In this case, this is post |
| ** processing of AGF PDU to send single RR or RNR after processing all I |
| ** PDUs in received AGF if there was no I-PDU to carry N(R). |
| ** |
| ** Send RR or RNR if any change of local busy condition or rx congestion |
| ** status, or V(RA) is not V(R). |
| */ |
| for (idx = 0; idx < LLCP_MAX_DATA_LINK; idx++) { |
| if (llcp_cb.dlcb[idx].state == LLCP_DLC_STATE_CONNECTED) { |
| llcp_util_send_rr_rnr(&(llcp_cb.dlcb[idx])); |
| |
| /* check flag to send DISC when tx queue is empty */ |
| if (llcp_cb.dlcb[idx].flags & LLCP_DATA_LINK_FLAG_PENDING_DISC) { |
| /* if no pending data and all PDU is acked */ |
| if ((llcp_cb.dlcb[idx].i_xmit_q.count == 0) && |
| (llcp_cb.dlcb[idx].next_rx_seq == llcp_cb.dlcb[idx].sent_ack_seq) && |
| (llcp_cb.dlcb[idx].next_tx_seq == llcp_cb.dlcb[idx].rcvd_ack_seq)) { |
| llcp_cb.dlcb[idx].flags &= ~LLCP_DATA_LINK_FLAG_PENDING_DISC; |
| llcp_dlsm_execute(&(llcp_cb.dlcb[idx]), |
| LLCP_DLC_EVENT_API_DISCONNECT_REQ, &flush); |
| } |
| } |
| } |
| } |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function llcp_dlc_is_rw_open |
| ** |
| ** Description check if receive window is open in remote |
| ** |
| ** Returns TRUE if remote can receive more data |
| ** |
| *******************************************************************************/ |
| bool llcp_dlc_is_rw_open(tLLCP_DLCB* p_dlcb) { |
| if ((uint8_t)(p_dlcb->next_tx_seq - p_dlcb->rcvd_ack_seq) % LLCP_SEQ_MODULO < |
| p_dlcb->remote_rw) { |
| return true; |
| } else { |
| DLOG_IF(INFO, nfc_debug_enabled) << StringPrintf( |
| "Flow Off, V(S):%d, V(SA):%d, RW(R):%d", p_dlcb->next_tx_seq, |
| p_dlcb->rcvd_ack_seq, p_dlcb->remote_rw); |
| return false; |
| } |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function llcp_dlc_get_next_pdu |
| ** |
| ** Description Get a PDU from tx queue of data link |
| ** |
| ** Returns NFC_HDR* |
| ** |
| *******************************************************************************/ |
| NFC_HDR* llcp_dlc_get_next_pdu(tLLCP_DLCB* p_dlcb) { |
| NFC_HDR* p_msg = NULL; |
| bool flush = true; |
| tLLCP_SAP_CBACK_DATA data; |
| |
| uint8_t send_seq = p_dlcb->next_tx_seq; |
| |
| /* if there is data to send and remote device can receive it */ |
| if ((p_dlcb->i_xmit_q.count) && (!p_dlcb->remote_busy) && |
| (llcp_dlc_is_rw_open(p_dlcb))) { |
| p_msg = (NFC_HDR*)GKI_dequeue(&p_dlcb->i_xmit_q); |
| llcp_cb.total_tx_i_pdu--; |
| |
| if (p_msg->offset >= LLCP_MIN_OFFSET) { |
| /* add LLCP header, DSAP, PTYPE, SSAP, N(S), N(R) and update sent_ack_seq, |
| * V(RA) */ |
| llcp_util_build_info_pdu(p_dlcb, p_msg); |
| |
| p_dlcb->next_tx_seq = (p_dlcb->next_tx_seq + 1) % LLCP_SEQ_MODULO; |
| |
| DLOG_IF(INFO, nfc_debug_enabled) << StringPrintf( |
| "LLCP TX - N(S,R):(%d,%d) V(S,SA,R,RA):(%d,%d,%d,%d)", send_seq, |
| p_dlcb->next_rx_seq, p_dlcb->next_tx_seq, p_dlcb->rcvd_ack_seq, |
| p_dlcb->next_rx_seq, p_dlcb->sent_ack_seq); |
| } else { |
| LOG(ERROR) << StringPrintf("offset (%d) must be %d at least", |
| p_msg->offset, LLCP_MIN_OFFSET); |
| GKI_freebuf(p_msg); |
| p_msg = NULL; |
| } |
| } |
| |
| /* if tx queue is empty and all PDU is acknowledged */ |
| if ((p_dlcb->i_xmit_q.count == 0) && |
| (p_dlcb->next_rx_seq == p_dlcb->sent_ack_seq) && |
| (p_dlcb->next_tx_seq == p_dlcb->rcvd_ack_seq)) { |
| /* check flag to send DISC */ |
| if (p_dlcb->flags & LLCP_DATA_LINK_FLAG_PENDING_DISC) { |
| p_dlcb->flags &= ~LLCP_DATA_LINK_FLAG_PENDING_DISC; |
| llcp_dlsm_execute(p_dlcb, LLCP_DLC_EVENT_API_DISCONNECT_REQ, &flush); |
| } |
| |
| /* check flag to notify upper layer */ |
| if (p_dlcb->flags & LLCP_DATA_LINK_FLAG_NOTIFY_TX_DONE) { |
| p_dlcb->flags &= ~LLCP_DATA_LINK_FLAG_NOTIFY_TX_DONE; |
| |
| data.tx_complete.event = LLCP_SAP_EVT_TX_COMPLETE; |
| data.tx_complete.local_sap = p_dlcb->local_sap; |
| data.tx_complete.remote_sap = p_dlcb->remote_sap; |
| |
| (*p_dlcb->p_app_cb->p_app_cback)(&data); |
| } |
| } |
| |
| return p_msg; |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function llcp_dlc_get_next_pdu_length |
| ** |
| ** Description return length of PDU which is top in tx queue of data link |
| ** |
| ** Returns length of PDU |
| ** |
| *******************************************************************************/ |
| uint16_t llcp_dlc_get_next_pdu_length(tLLCP_DLCB* p_dlcb) { |
| NFC_HDR* p_msg; |
| |
| /* if there is data to send and remote device can receive it */ |
| if ((p_dlcb->i_xmit_q.count) && (!p_dlcb->remote_busy) && |
| (llcp_dlc_is_rw_open(p_dlcb))) { |
| p_msg = (NFC_HDR*)p_dlcb->i_xmit_q.p_first; |
| |
| return (p_msg->len + LLCP_PDU_HEADER_SIZE + LLCP_SEQUENCE_SIZE); |
| } |
| return 0; |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function llcp_dlsm_get_state_name |
| ** |
| ** Description This function returns the state name. |
| ** |
| ** Returns pointer to the name |
| ** |
| *******************************************************************************/ |
| static std::string llcp_dlsm_get_state_name(tLLCP_DLC_STATE state) { |
| switch (state) { |
| case LLCP_DLC_STATE_IDLE: |
| return "IDLE"; |
| case LLCP_DLC_STATE_W4_REMOTE_RESP: |
| return "W4_REMOTE_RESP"; |
| case LLCP_DLC_STATE_W4_LOCAL_RESP: |
| return "W4_LOCAL_RESP"; |
| case LLCP_DLC_STATE_CONNECTED: |
| return "CONNECTED"; |
| case LLCP_DLC_STATE_W4_REMOTE_DM: |
| return "W4_REMOTE_DM"; |
| default: |
| return "???? UNKNOWN STATE"; |
| } |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function llcp_dlsm_get_event_name |
| ** |
| ** Description This function returns the event name. |
| ** |
| ** Returns pointer to the name |
| ** |
| *******************************************************************************/ |
| static std::string llcp_dlsm_get_event_name(tLLCP_DLC_EVENT event) { |
| switch (event) { |
| case LLCP_DLC_EVENT_API_CONNECT_REQ: |
| return "API_CONNECT_REQ"; |
| case LLCP_DLC_EVENT_API_CONNECT_CFM: |
| return "API_CONNECT_CFM"; |
| case LLCP_DLC_EVENT_API_CONNECT_REJECT: |
| return "API_CONNECT_REJECT"; |
| case LLCP_DLC_EVENT_PEER_CONNECT_IND: |
| return "PEER_CONNECT_IND"; |
| case LLCP_DLC_EVENT_PEER_CONNECT_CFM: |
| return "PEER_CONNECT_CFM"; |
| case LLCP_DLC_EVENT_API_DATA_REQ: |
| return "API_DATA_REQ"; |
| case LLCP_DLC_EVENT_PEER_DATA_IND: |
| return "PEER_DATA_IND"; |
| case LLCP_DLC_EVENT_API_DISCONNECT_REQ: |
| return "API_DISCONNECT_REQ"; |
| case LLCP_DLC_EVENT_PEER_DISCONNECT_IND: |
| return "PEER_DISCONNECT_IND"; |
| case LLCP_DLC_EVENT_PEER_DISCONNECT_RESP: |
| return "PEER_DISCONNECT_RESP"; |
| case LLCP_DLC_EVENT_FRAME_ERROR: |
| return "FRAME_ERROR"; |
| case LLCP_DLC_EVENT_LINK_ERROR: |
| return "LINK_ERROR"; |
| case LLCP_DLC_EVENT_TIMEOUT: |
| return "TIMEOUT"; |
| default: |
| return "???? UNKNOWN EVENT"; |
| } |
| } |