| // Copyright 2014 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. |
| |
| // This file intentionally does not have header guards, it's included |
| // inside a macro to generate values. The following line silences a |
| // presubmit warning that would otherwise be triggered by this: |
| // no-include-guard-because-multiply-included |
| // NOLINT(build/header_guard) |
| |
| // This file contains the list of QUIC protocol flags. |
| |
| // Time period for which a given connection_id should live in the time-wait |
| // state. |
| QUIC_FLAG(int64_t, FLAGS_quic_time_wait_list_seconds, 200) |
| |
| // Currently, this number is quite conservative. The max QPS limit for an |
| // individual server silo is currently set to 1000 qps, though the actual max |
| // that we see in the wild is closer to 450 qps. Regardless, 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. |
| // |
| // Maximum number of connections on the time-wait list. A negative value implies |
| // no configured limit. |
| QUIC_FLAG(int64_t, FLAGS_quic_time_wait_list_max_connections, 600000) |
| |
| // If true, require handshake confirmation for QUIC connections, functionally |
| // disabling 0-rtt handshakes. |
| // TODO(rtenneti): Enable this flag after CryptoServerTest's are fixed. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_require_handshake_confirmation, |
| false) |
| |
| // If true, disable pacing in QUIC. |
| QUIC_FLAG(bool, FLAGS_quic_disable_pacing_for_perf_tests, false) |
| |
| // If true, enforce that QUIC CHLOs fit in one packet. |
| QUIC_FLAG(bool, FLAGS_quic_enforce_single_packet_chlo, 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_FLAG(bool, FLAGS_quic_allow_chlo_buffering, true) |
| |
| // If greater than zero, mean RTT variation is multiplied by the specified |
| // factor and added to the congestion window limit. |
| QUIC_FLAG(double, FLAGS_quic_bbr_rtt_variation_weight, 0.0f) |
| |
| // Congestion window gain for QUIC BBR during PROBE_BW phase. |
| QUIC_FLAG(double, FLAGS_quic_bbr_cwnd_gain, 2.0f) |
| |
| // If true, adjust congestion window when doing bandwidth resumption in BBR. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_fix_bbr_cwnd_in_bandwidth_resumption, |
| true) |
| |
| // When true, defaults to BBR congestion control instead of Cubic. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_default_to_bbr, false) |
| |
| // If true, use BBRv2 as the default congestion controller. |
| // Takes precedence over --quic_default_to_bbr. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_default_to_bbr_v2, false) |
| |
| // If buffered data in QUIC stream is less than this threshold, buffers all |
| // provided data or asks upper layer for more data. |
| QUIC_FLAG(uint32_t, FLAGS_quic_buffered_data_threshold, 8192u) |
| |
| // Max size of data slice in bytes for QUIC stream send buffer. |
| QUIC_FLAG(uint32_t, FLAGS_quic_send_buffer_max_data_slice_size, 4096u) |
| |
| // Anti-amplification factor. Before address validation, server will |
| // send no more than factor times bytes received. |
| QUIC_FLAG(int32_t, FLAGS_quic_anti_amplification_factor, 3) |
| |
| // Enables 3 new connection options to make PROBE_RTT more aggressive |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_less_probe_rtt, false) |
| |
| // If true, enable QUIC v99. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_99, false) |
| |
| // When true, set the initial congestion control window from connection options |
| // in QuicSentPacketManager rather than TcpCubicSenderBytes. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_unified_iw_options, false) |
| |
| // Number of packets that the pacing sender allows in bursts during pacing. |
| QUIC_FLAG(int32_t, FLAGS_quic_lumpy_pacing_size, 2) |
| |
| // Congestion window fraction that the pacing sender allows in bursts during |
| // pacing. |
| QUIC_FLAG(double, FLAGS_quic_lumpy_pacing_cwnd_fraction, 0.25f) |
| |
| // Default enables QUIC ack decimation and adds a connection option to disable |
| // it. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_ack_decimation, false) |
| |
| // If true, QUIC offload pacing when using USPS as egress method. |
| QUIC_FLAG(bool, FLAGS_quic_restart_flag_quic_offload_pacing_to_usps2, false) |
| |
| // Max time that QUIC can pace packets into the future in ms. |
| QUIC_FLAG(int32_t, FLAGS_quic_max_pace_time_into_future_ms, 10) |
| |
| // Smoothed RTT fraction that a connection can pace packets into the future. |
| QUIC_FLAG(double, FLAGS_quic_pace_time_into_future_srtt_fraction, 0.125f) |
| |
| // Mechanism to override version label and ALPN for IETF interop. |
| QUIC_FLAG(int32_t, FLAGS_quic_ietf_draft_version, 0) |
| |
| // If true, stop resetting ideal_next_packet_send_time_ in pacing sender. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_donot_reset_ideal_next_packet_send_time, |
| false) |
| |
| // If true, enable experiment for testing PCC congestion-control. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_pcc3, false) |
| |
| // When true, ensure BBR allows at least one MSS to be sent in response to an |
| // ACK in packet conservation. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_one_mss_conservation, false) |
| |
| // Enables the BBQ5 connection option, which forces saved aggregation values to |
| // expire when the bandwidth increases more than 25% in QUIC BBR STARTUP. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_slower_startup4, false) |
| |
| // When true and the BBR9 connection option is present, BBR only considers |
| // bandwidth samples app-limited if they're not filling the pipe. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_flexible_app_limited, false) |
| |
| // If true, calling StopReading() on a level-triggered QUIC stream sequencer |
| // will cause the sequencer to discard future data. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_stop_reading_when_level_triggered, |
| false) |
| |
| // When the STMP connection option is sent by the client, timestamps in the QUIC |
| // ACK frame are sent and processed. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_send_timestamps, false) |
| |
| // When in STARTUP and recovery, do not add bytes_acked to QUIC BBR's CWND in |
| // CalculateCongestionWindow() |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_bbr_no_bytes_acked_in_startup_recovery, |
| false) |
| |
| // If true, use common code for checking whether a new stream ID may be |
| // allocated. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_use_common_stream_check, false) |
| |
| // If true, QuicEpollClock::Now() will monotonically increase. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_monotonic_epoll_clock, false) |
| |
| // If true, enables the BBS4 and BBS5 connection options, which reduce BBR's |
| // pacing rate in STARTUP as more losses occur as a fraction of CWND. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_bbr_startup_rate_reduction, |
| false) |
| |
| // If true, enable QUIC version 47. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_47, false) |
| |
| // If true, enable QUIC version 48. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_48_2, true) |
| |
| // If true, disable QUIC version 39. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_disable_version_39, true) |
| |
| // If true and using Leto for QUIC shared-key calculations, GFE will react to a |
| // failure to contact Leto by sending a REJ containing a fallback ServerConfig, |
| // allowing the client to continue the handshake. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_send_quic_fallback_server_config_on_leto_error, |
| false) |
| |
| // If true, enable QUIC version 49. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_49, false) |
| |
| // If true, GFE will not request private keys when fetching QUIC ServerConfigs |
| // from Leto. |
| QUIC_FLAG(bool, |
| FLAGS_quic_restart_flag_dont_fetch_quic_private_keys_from_leto, |
| false) |
| |
| // In v44 and above, where STOP_WAITING is never sent, close the connection if |
| // it's received. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_do_not_accept_stop_waiting, |
| false) |
| |
| // If true, set burst token to 2 in cwnd bootstrapping experiment. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_conservative_bursts, false) |
| |
| // If true, export number of packets written per write operation histogram.") |
| QUIC_FLAG(bool, FLAGS_quic_export_server_num_packets_per_write_histogram, false) |
| |
| // If true, uses conservative cwnd gain and pacing gain. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_conservative_cwnd_and_pacing_gains, |
| false) |
| |
| // When true, QUIC Version Negotiation packets will randomly include fake |
| // versions. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_version_negotiation_grease, |
| false) |
| |
| // If true, use predictable version negotiation versions. |
| QUIC_FLAG(bool, FLAGS_quic_disable_version_negotiation_grease_randomness, false) |
| |
| // If true, do not add connection ID of packets with unknown connection ID |
| // and no version to time wait list, instead, send appropriate responses |
| // depending on the packets' sizes and drop them. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_reject_unprocessable_packets_statelessly, |
| false) |
| |
| // If true, when RTO fires and there is no packet to be RTOed, let connection |
| // send. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_fix_rto_retransmission3, true) |
| |
| // Maximum number of tracked packets. |
| QUIC_FLAG(int64_t, FLAGS_quic_max_tracked_packet_count, 10000) |
| |
| // If true, HTTP request header names sent from QuicSpdyClientBase(and |
| // descendents) will be automatically converted to lower case. |
| QUIC_FLAG(bool, FLAGS_quic_client_convert_http_header_name_to_lowercase, true) |
| |
| // If true, do not send STOP_WAITING if no_stop_waiting_frame_. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_simplify_stop_waiting, false) |
| |
| // If true, allow client to enable BBRv2 on server via connection option 'B2ON'. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_allow_client_enabled_bbr_v2, |
| false) |
| |
| // If true, will negotiate the ACK delay time. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_negotiate_ack_delay_time, false) |
| |
| // When true, QuicDispatcher will always use QuicFramer::ParsePublicHeader |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_use_parse_public_header, true) |
| |
| // If true, QuicFramer::WriteClientVersionNegotiationProbePacket uses |
| // length-prefixed connection IDs. |
| QUIC_FLAG(bool, FLAGS_quic_prober_uses_length_prefixed_connection_ids, false) |
| |
| // When true, QuicFramer allows parsing failures of source connection ID for |
| // the PROX version. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_parse_prox_source_connection_id, |
| false) |
| |
| // If true and H2PR connection option is received, write_blocked_streams_ uses |
| // HTTP2 (tree-style) priority write scheduler. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_use_http2_priority_write_scheduler, |
| true) |
| |
| // If true, close connection if there are too many (> 1000) buffered control |
| // frames. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_add_upper_limit_of_buffered_control_frames3, |
| false) |
| |
| // If true, static streams should never be closed before QuicSession |
| // destruction. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_active_streams_never_negative, |
| true) |
| |
| // If true and FIFO connection option is received, write_blocked_streams uses |
| // FIFO(stream with smallest ID has highest priority) write scheduler. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_enable_fifo_write_scheduler, |
| true) |
| |
| // If true and LIFO connection option is received, write_blocked_streams uses |
| // LIFO(stream with largest ID has highest priority) write scheduler. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_enable_lifo_write_scheduler, |
| true) |
| |
| // When true, remove obsolete functionality intended to test IETF QUIC recovery. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_sent_packet_manager_cleanup, |
| true) |
| |
| // If true, QUIC will track max ack height in BandwidthSampler. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_track_ack_height_in_bandwidth_sampler2, |
| true) |
| |
| // If true, QuicSession::ShouldKeepConnectionAlive() will not consider locally |
| // closed streams whose highest byte offset is not received yet. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_aggressive_connection_aliveness, |
| true) |
| |
| // If true, QuicStreamSequencer will not take in new data if the stream is |
| // reset. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_no_stream_data_after_reset, |
| false) |
| |
| // When true, QuicDispatcher::MaybeDispatchPacket will use |
| // packet_info.use_length_prefix instead of an incorrect local computation. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_use_length_prefix_from_packet_info, |
| true) |
| |
| // If true, enable IETF style probe timeout. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_pto, true) |
| |
| // When true, QuicFramer will use QueueUndecryptablePacket on all QUIC versions. |
| QUIC_FLAG(bool, |
| FLAGS_quic_restart_flag_quic_framer_uses_undecryptable_upcall, |
| true) |
| |
| // When true, QuicUtils::GenerateStatelessResetToken will hash connection IDs |
| // instead of XORing the bytes |
| QUIC_FLAG(bool, |
| FLAGS_quic_restart_flag_quic_use_hashed_stateless_reset_tokens, |
| true) |
| |
| // This flag enables a temporary workaround which makes us reply to a specific |
| // invalid packet that is sent by an Android UDP network conformance test. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_reply_to_old_android_conformance_test, |
| true) |
| |
| // If true, no SPDY SETTINGS will be sent after handshake is confirmed. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_do_not_send_settings, true) |
| |
| // The maximum amount of CRYPTO frame data that can be buffered. |
| QUIC_FLAG(int32_t, FLAGS_quic_max_buffered_crypto_bytes, 16 * 1024) |
| |
| // If true, use the saved time of the last sent inflight packet rather than |
| // traversing the deque. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_simple_inflight_time, true) |
| |
| // If true, QUIC supports both QUIC Crypto and TLS 1.3 for the handshake |
| // protocol. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_supports_tls_handshake, true) |
| |
| // If true, deprecate SpuriousRetransmitDetected and call SpuriousLossDetected |
| // instead. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_detect_spurious_loss, true) |
| |
| // If true, a stream will reset itself if it receives a stream frame that |
| // includes a data beyond the close offset. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_rst_if_stream_frame_beyond_close_offset, |
| true) |
| |
| // If true, enable IETF loss detection as described in |
| // https://tools.ietf.org/html/draft-ietf-quic-recovery-22#section-6.1. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_enable_ietf_loss_detection, |
| true) |
| |
| // If true, skip packet number before sending the last PTO retransmission. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_skip_packet_number_for_pto, |
| true) |
| // If true, enable HTTP/2 default scheduling(round robin). |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_rr_write_scheduler, true) |
| |
| // If true, when timer fires in RTO or PTO mode, make sure there is enough |
| // credits to retransmit one packet. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_grant_enough_credits, false) |
| |
| // If true, combine QuicPacketGenerator and QuicPacketCreator. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_combine_generator_and_creator, |
| false) |
| |
| // If true, QuicFramer does not create an encrypter/decrypter for the |
| // ENCRYPTION_INITIAL level. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_framer_doesnt_create_initial_encrypter, |
| false) |
| |
| // If true, server drops client initial packets in datagrams < 1200 bytes. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_donot_process_small_initial_packets, |
| false) |
| |
| // If true, treat queued QUIC packets as sent. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_treat_queued_packets_as_sent, |
| false) |
| |
| // Call NeuterHandshakePackets() at most once per connection. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_neuter_handshake_packets_once, |
| false) |
| |
| // If true, support HTTP/3 priority in v99. |
| QUIC_FLAG(bool, FLAGS_quic_allow_http3_priority, false) |
| |
| // If true, enable QUIC version 50. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_50, false) |
| |
| // If true, enable QUIC MTU discovery version 2. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_mtu_discovery_v2, false) |
