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// Copyright (c) 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// NOLINT(build/header_guard)
// This file intentionally does not have header guards, it's intended to be
// included multiple times, each time with a different definition of
bool, quic_allow_chlo_buffering, true,
"If true, allows packets to be buffered in anticipation of a "
"future CHLO, and allow CHLO packets to be buffered until next "
"iteration of the event loop.")
QUIC_PROTOCOL_FLAG(bool, quic_disable_pacing_for_perf_tests, false,
"If true, disable pacing in QUIC")
// Note that single-packet CHLOs are only enforced for Google QUIC versions that
// do not use CRYPTO frames. This currently means only Q043 and Q046. All other
// versions of QUIC (both Google QUIC and IETF) allow multi-packet CHLOs
// regardless of the value of this flag.
QUIC_PROTOCOL_FLAG(bool, quic_enforce_single_packet_chlo, true,
"If true, enforce that sent QUIC CHLOs fit in one packet. "
"Only applies to Q043 and Q046.")
// Currently, this number is quite conservative. At a hypothetical 1000 qps,
// this means that the longest time-wait list we should see is:
// 200 seconds * 1000 qps = 200000.
// Of course, there are usually many queries per QUIC connection, so we allow a
// factor of 3 leeway.
QUIC_PROTOCOL_FLAG(int64_t, quic_time_wait_list_max_connections, 600000,
"Maximum number of connections on the time-wait list. "
"A negative value implies no configured limit.")
QUIC_PROTOCOL_FLAG(int64_t, quic_time_wait_list_seconds, 200,
"Time period for which a given connection_id should live in "
"the time-wait state.")
// This number is relatively conservative. For example, there are at most 1K
// queued stateless resets, which consume 1K * 21B = 21KB.
uint64_t, quic_time_wait_list_max_pending_packets, 1024,
"Upper limit of pending packets in time wait list when writer is blocked.")
// Stop sending a reset if the recorded number of addresses that server has
// recently sent stateless reset to exceeds this limit.
QUIC_PROTOCOL_FLAG(uint64_t, quic_max_recent_stateless_reset_addresses, 1024,
"Max number of recorded recent reset addresses.")
// After this timeout, recent reset addresses will be cleared.
// FLAGS_quic_max_recent_stateless_reset_addresses * (1000ms /
// FLAGS_quic_recent_stateless_reset_addresses_lifetime_ms) is roughly the max
// reset per second. For example, 1024 * (1000ms / 1000ms) = 1K reset per
// second.
uint64_t, quic_recent_stateless_reset_addresses_lifetime_ms, 1000,
"Max time that a client address lives in recent reset addresses set.")
QUIC_PROTOCOL_FLAG(double, quic_bbr_cwnd_gain, 2.0f,
"Congestion window gain for QUIC BBR during PROBE_BW phase.")
int32_t, quic_buffered_data_threshold, 8 * 1024,
"If buffered data in QUIC stream is less than this "
"threshold, buffers all provided data or asks upper layer for more data")
uint64_t, quic_send_buffer_max_data_slice_size, 4 * 1024,
"Max size of data slice in bytes for QUIC stream send buffer.")
int32_t, quic_lumpy_pacing_size, 2,
"Number of packets that the pacing sender allows in bursts during "
"pacing. This flag is ignored if a flow's estimated bandwidth is "
"lower than 1200 kbps.")
double, quic_lumpy_pacing_cwnd_fraction, 0.25f,
"Congestion window fraction that the pacing sender allows in bursts "
"during pacing.")
int32_t, quic_lumpy_pacing_min_bandwidth_kbps, 1200,
"The minimum estimated client bandwidth below which the pacing sender will "
"not allow bursts.")
QUIC_PROTOCOL_FLAG(int32_t, quic_max_pace_time_into_future_ms, 10,
"Max time that QUIC can pace packets into the future in ms.")
double, quic_pace_time_into_future_srtt_fraction,
0.125f, // One-eighth smoothed RTT
"Smoothed RTT fraction that a connection can pace packets into the future.")
QUIC_PROTOCOL_FLAG(bool, quic_export_write_path_stats_at_server, false,
"If true, export detailed write path statistics at server.")
QUIC_PROTOCOL_FLAG(bool, quic_disable_version_negotiation_grease_randomness,
"If true, use predictable version negotiation versions.")
QUIC_PROTOCOL_FLAG(bool, quic_enable_http3_grease_randomness, true,
"If true, use random greased settings and frames.")
QUIC_PROTOCOL_FLAG(int64_t, quic_max_tracked_packet_count, 10000,
"Maximum number of tracked packets.")
bool, quic_client_convert_http_header_name_to_lowercase, true,
"If true, HTTP request header names sent from QuicSpdyClientBase(and "
"descendents) will be automatically converted to lower case.")
int32_t, quic_bbr2_default_probe_bw_base_duration_ms, 2000,
"The default minimum duration for BBRv2-native probes, in milliseconds.")
int32_t, quic_bbr2_default_probe_bw_max_rand_duration_ms, 1000,
"The default upper bound of the random amount of BBRv2-native "
"probes, in milliseconds.")
int32_t, quic_bbr2_default_probe_rtt_period_ms, 10000,
"The default period for entering PROBE_RTT, in milliseconds.")
double, quic_bbr2_default_loss_threshold, 0.02,
"The default loss threshold for QUIC BBRv2, should be a value "
"between 0 and 1.")
int32_t, quic_bbr2_default_startup_full_loss_count, 8,
"The default minimum number of loss marking events to exit STARTUP.")
int32_t, quic_bbr2_default_probe_bw_full_loss_count, 2,
"The default minimum number of loss marking events to exit PROBE_UP phase.")
double, quic_bbr2_default_inflight_hi_headroom, 0.15,
"The default fraction of unutilized headroom to try to leave in path "
"upon high loss.")
int32_t, quic_bbr2_default_initial_ack_height_filter_window, 10,
"The default initial value of the max ack height filter's window length.")
double, quic_ack_aggregation_bandwidth_threshold, 1.0,
"If the bandwidth during ack aggregation is smaller than (estimated "
"bandwidth * this flag), consider the current aggregation completed "
"and starts a new one.")
int32_t, quic_anti_amplification_factor, 3,
"Anti-amplification factor. Before address validation, server will "
"send no more than factor times bytes received.")
int32_t, quic_max_buffered_crypto_bytes,
16 * 1024, // 16 KB
"The maximum amount of CRYPTO frame data that can be buffered.")
int32_t, quic_max_aggressive_retransmittable_on_wire_ping_count, 5,
"Maximum number of consecutive pings that can be sent with the "
"aggressive initial retransmittable on the wire timeout if there is "
"no new stream data received. After this limit, the timeout will be "
"doubled each ping until it exceeds the default ping timeout.")
int32_t, quic_max_retransmittable_on_wire_ping_count, 1000,
"Maximum number of pings that can be sent with the retransmittable "
"on the wire timeout, over the lifetime of a connection. After this "
"limit, the timeout will be the default ping timeout.")
QUIC_PROTOCOL_FLAG(int32_t, quic_max_congestion_window, 2000,
"The maximum congestion window in packets.")
int32_t, quic_max_streams_window_divisor, 2,
"The divisor that controls how often MAX_STREAMS frame is sent.")
uint64_t, quic_key_update_confidentiality_limit, 0,
"If non-zero and key update is allowed, the maximum number of "
"packets sent for each key phase before initiating a key update.")
QUIC_PROTOCOL_FLAG(bool, quic_disable_client_tls_zero_rtt, false,
"If true, QUIC client with TLS will not try 0-RTT.")
QUIC_PROTOCOL_FLAG(bool, quic_disable_server_tls_resumption, false,
"If true, QUIC server will disable TLS resumption by not "
"issuing or processing session tickets.")
QUIC_PROTOCOL_FLAG(bool, quic_defer_send_in_response, true,
"If true, QUIC servers will defer sending in response to "
"incoming packets by default.")
bool, quic_header_size_limit_includes_overhead, true,
"If true, QUIC QPACK decoder includes 32-bytes overheader per entry while "
"comparing request/response header size against its upper limit.")
bool, quic_reject_retry_token_in_initial_packet, false,
"If true, always reject retry_token received in INITIAL packets")
QUIC_PROTOCOL_FLAG(bool, quic_use_lower_server_response_mtu_for_test, false,
"If true, cap server response packet size at 1250.")
QUIC_PROTOCOL_FLAG(bool, quic_enforce_strict_amplification_factor, false,
"If true, enforce strict amplification factor")
QUIC_PROTOCOL_FLAG(bool, quic_bounded_crypto_send_buffer, false,
"If true, close the connection if a crypto send buffer "
"exceeds its size limit.")