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/*
* Copyright (C) 2019 The Android Open Source Project
*
* 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.
*/
package android.net.util;
/**
* Collection of utilities for data stall.
*/
public class DataStallUtils {
/** Detect data stall using dns timeout counts. */
public static final int DATA_STALL_EVALUATION_TYPE_DNS = 1 << 0;
/** Detect data stall using tcp connection fail rate. */
public static final int DATA_STALL_EVALUATION_TYPE_TCP = 1 << 1;
// Default configuration values for data stall detection.
public static final int DEFAULT_CONSECUTIVE_DNS_TIMEOUT_THRESHOLD = 5;
public static final int DEFAULT_DATA_STALL_MIN_EVALUATE_TIME_MS = 60 * 1000;
public static final int DEFAULT_DATA_STALL_VALID_DNS_TIME_THRESHOLD_MS = 30 * 60 * 1000;
/**
* The threshold value for the number of consecutive dns timeout events received to be a
* signal of data stall. The number of consecutive timeouts needs to be {@code >=} this
* threshold to be considered a data stall. Set the value to {@code <= 0} to disable. Note
* that the value should be {@code > 0} if the DNS data stall detection is enabled.
*
*/
public static final String CONFIG_DATA_STALL_CONSECUTIVE_DNS_TIMEOUT_THRESHOLD =
"data_stall_consecutive_dns_timeout_threshold";
/**
* The minimal time interval in milliseconds for data stall reevaluation.
*
*/
public static final String CONFIG_DATA_STALL_MIN_EVALUATE_INTERVAL =
"data_stall_min_evaluate_interval";
/**
* DNS timeouts older than this timeout (in milliseconds) are not considered for detecting
* a data stall.
*
*/
public static final String CONFIG_DATA_STALL_VALID_DNS_TIME_THRESHOLD =
"data_stall_valid_dns_time_threshold";
/**
* Which data stall detection signal to use. This is a bitmask constructed by bitwise-or-ing
* (i.e. {@code |}) the DATA_STALL_EVALUATION_TYPE_* values.
*
* Type: int
* Valid values:
* {@link #DATA_STALL_EVALUATION_TYPE_DNS} : Use dns as a signal.
* {@link #DATA_STALL_EVALUATION_TYPE_TCP} : Use tcp info as a signal.
*/
public static final String CONFIG_DATA_STALL_EVALUATION_TYPE = "data_stall_evaluation_type";
public static final int DEFAULT_DATA_STALL_EVALUATION_TYPES =
DATA_STALL_EVALUATION_TYPE_DNS | DATA_STALL_EVALUATION_TYPE_TCP;
// The default number of DNS events kept of the log kept for dns signal evaluation. Each event
// is represented by a {@link com.android.server.connectivity.NetworkMonitor#DnsResult} objects.
// It's also the size of array of {@link com.android.server.connectivity.nano.DnsEvent} kept in
// metrics. Note that increasing the size may cause statsd log buffer bust. Need to check the
// design in statsd when you try to increase the size.
public static final int DEFAULT_DNS_LOG_SIZE = 20;
/**
* The time interval for polling tcp info to observe the tcp health.
*/
public static String CONFIG_DATA_STALL_TCP_POLLING_INTERVAL = "data_stall_tcp_polling_interval";
/**
* Default polling interval to observe the tcp health.
*/
public static int DEFAULT_TCP_POLLING_INTERVAL_MS = 10_000;
/**
* Default tcp packets fail rate to suspect as a data stall.
*
* Calculated by ((# of packets lost)+(# of packets retrans))/(# of packets sent)*100. Ideally,
* the percentage should be 100%. However, the ongoing packets may not be considered as neither
* lost or retrans yet. It will cause the percentage lower.
*/
public static final int DEFAULT_TCP_PACKETS_FAIL_PERCENTAGE = 80;
/**
* The percentage of tcp packets fail rate to be suspected as a data stall.
*
* Type: int
* Valid values: 0 to 100.
*/
public static final String CONFIG_TCP_PACKETS_FAIL_PERCENTAGE = "tcp_packets_fail_percentage";
/** Corresponds to enum from bionic/libc/include/netinet/tcp.h. */
public static final int TCP_ESTABLISHED = 1;
public static final int TCP_SYN_SENT = 2;
public static final int TCP_SYN_RECV = 3;
public static final int TCP_MONITOR_STATE_FILTER =
(1 << TCP_ESTABLISHED) | (1 << TCP_SYN_SENT) | (1 << TCP_SYN_RECV);
/**
* Threshold for the minimal tcp packets count to evaluate data stall via tcp info.
*/
public static final int DEFAULT_DATA_STALL_MIN_PACKETS_THRESHOLD = 10;
public static final String CONFIG_MIN_PACKETS_THRESHOLD = "tcp_min_packets_threshold";
}
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