| // 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) |
| |
| // Enables server-side support for QUIC stateless rejects. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_enable_quic_stateless_reject_support, |
| false) |
| |
| // 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, QUIC will use cheap stateless rejects without creating a full |
| // connection. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_use_cheap_stateless_rejects, |
| false) |
| |
| // 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) |
| |
| // Simplify QUIC\'s adaptive time loss detection to measure the necessary |
| // reordering window for every spurious retransmit. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_fix_adaptive_time_loss, false) |
| |
| // 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 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) |
| |
| // If true, QUIC supports both QUIC Crypto and TLS 1.3 for the handshake |
| // protocol. |
| QUIC_FLAG(bool, FLAGS_quic_supports_tls_handshake, false) |
| |
| // Allow QUIC to accept initial packet numbers that are random, not 1. |
| QUIC_FLAG(bool, FLAGS_quic_restart_flag_quic_enable_accept_random_ipn, true) |
| |
| // 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, 1) |
| |
| // Congestion window fraction that the pacing sender allows in bursts during |
| // pacing. |
| QUIC_FLAG(double, FLAGS_quic_lumpy_pacing_cwnd_fraction, 0.25f) |
| |
| // If true, static streams in a QuicSession will be stored inside dynamic |
| // stream map. static_stream_map will no longer be used. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_eliminate_static_stream_map_3, |
| false) |
| |
| // 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, enable QUIC v44. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_44, true) |
| |
| // Stop checking QuicUnackedPacketMap::HasUnackedRetransmittableFrames and |
| // instead rely on the existing check that bytes_in_flight > 0 |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_optimize_inflight_check, false) |
| |
| // When you\'re app-limited entering recovery, stay app-limited until you exit |
| // recovery in QUIC BBR. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_app_limited_recovery, false) |
| |
| // 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) |
| |
| // Add 3 connection options to decrease the pacing and CWND gain in QUIC BBR |
| // STARTUP. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_slower_startup3, true) |
| |
| // When true, the LOSS connection option allows for 1/8 RTT of reording instead |
| // of the current 1/8th threshold which has been found to be too large for fast |
| // loss recovery. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_eighth_rtt_loss_detection, |
| 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) |
| |
| // If true, QuicSession::HasPendingCryptoData checks whether the crypto stream's |
| // send buffer is empty. This flag fixes a bug where the retransmission alarm |
| // mode is wrong for the first CHLO packet. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_fix_has_pending_crypto_data, |
| true) |
| |
| // When true, fix initialization and updating of |
| // |time_of_first_packet_sent_after_receiving_| in QuicConnection. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_fix_time_of_first_packet_sent_after_receiving, |
| true) |
| |
| // 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) |
| |
| // If true, dispatcher passes in a single version when creating a server |
| // connection, such that version negotiation is not supported in connection. |
| QUIC_FLAG(bool, |
| FLAGS_quic_restart_flag_quic_no_server_conn_ver_negotiation2, |
| true) |
| |
| // If true, enable QUIC version 46. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_46, true) |
| |
| // 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) |
| |
| // When true, remove packets from inflight where they're declared lost, |
| // rather than in MarkForRetransmission. Also no longer marks handshake |
| // packets as no longer inflight when they're retransmitted. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_loss_removes_from_inflight, |
| false) |
| |
| // If true, QuicEpollClock::Now() will monotonically increase. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_monotonic_epoll_clock, false) |
| |
| // If true, a client connection would be closed when a version negotiation |
| // packet is received. It would be the higher layer's responsibility to do the |
| // reconnection. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_no_client_conn_ver_negotiation, |
| false) |
| |
| // If true, public reset packets sent from GFE will include a kEPID tag. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_fix_spurious_ack_alarm, 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, log leaf cert subject name into warning log. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_log_cert_name_for_empty_sct, |
| true) |
| |
| // If true, enable QUIC version 47 which adds CRYPTO frames. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_47, false) |
| |
| // If true, disable QUIC version 39. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_disable_version_39, false) |
| |
| // If true, use one loss algorithm per encryption level. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_use_uber_loss_algorithm, true) |
| |
| // If true, QuicStreamSequencerBuffer will switch to a new |
| // QuicIntervalSet::AddOptimizedForAppend method in OnStreamData(). |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_faster_interval_add_in_sequence_buffer, |
| true) |
| |
| // If true, GFE time wait list will send termination packets based on current |
| // packet's encryption level. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_fix_termination_packets, true) |
| |
| // If true, stop using AckBundling mode to send ACK, also deprecate ack_queued |
| // from QuicConnection. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_deprecate_ack_bundling_mode, |
| true) |
| |
| // If both this flag and gfe2_reloadable_flag_quic_deprecate_ack_bundling_mode |
| // are true, QuicReceivedPacketManager decides when to send ACKs. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_rpm_decides_when_to_send_acks, |
| true) |
| |
| // In QUIC, do not close connection if received an in-order ACK with decreased |
| // largest_acked. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_tolerate_reneging, true) |
| |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_validate_packet_number_post_decryption, |
| true) |
| |
| // If this flag and quic_rpm_decides_when_to_send_acks is true, use uber |
| // received packet manager instead of the single received packet manager. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_use_uber_received_packet_manager, |
| 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, 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) |
| |
| // If true, disable lumpy pacing for low bandwidth flows. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_no_lumpy_pacing_at_low_bw, |
| false) |
| |
| // If true, in BbrSender, always get a bandwidth sample when a packet is acked, |
| // even if packet.bytes_acked is zero. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_always_get_bw_sample_when_acked, |
| true) |
| |
| // If true, ignore TLPR for retransmission delay when sending pings from ping |
| // alarm. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_ignore_tlpr_if_sending_ping, |
| true) |
| |
| // If true, non-ASCII QUIC tags are printed as hex instead of integers." |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_print_tag_hex, false) |
| |
| // If true, terminate Google QUIC connections similary as IETF QUIC. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_terminate_gquic_connection_as_ietf, |
| true) |
| |
| // If true, disable QUIC trial decryption in V44 and above. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_v44_disable_trial_decryption, |
| 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, deprecate queued_control_frames_ from QuicPacketGenerator. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_deprecate_queued_control_frames, |
| false) |
| |
| // When true, QUIC server will drop IETF QUIC Version Negotiation packets. |
| QUIC_FLAG(bool, |
| FLAGS_quic_restart_flag_quic_server_drop_version_negotiation, |
| false) |
| |
| // When true, version negotiation packets sent by the server will set the fixed |
| // bit. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_send_version_negotiation_fixed_bit, |
| false) |
| |
| // When true, allow variable length QUIC connection IDs for unsupported |
| // versions. This allows performing version negotiation when the client-chosen |
| // server connection ID length is not 8. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_restart_flag_quic_allow_variable_length_connection_id_for_negotiation, |
| 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, make QuicDispatcher no longer have an instance of QuicFramer. |
| QUIC_FLAG(bool, |
| FLAGS_quic_restart_flag_quic_no_framer_object_in_dispatcher, |
| false) |
| |
| // When true, QuicFramer will not override connection IDs in headers and will |
| // instead respect the source/destination direction as expected by IETF QUIC. |
| QUIC_FLAG(bool, |
| FLAGS_quic_restart_flag_quic_do_not_override_connection_id, |
| false) |
