| // 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 |
| // QUIC_PROTOCOL_FLAG. |
| |
| #if defined(QUIC_PROTOCOL_FLAG) |
| |
| QUIC_PROTOCOL_FLAG( |
| 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. |
| QUIC_PROTOCOL_FLAG( |
| 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. |
| QUIC_PROTOCOL_FLAG( |
| 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.") |
| |
| QUIC_PROTOCOL_FLAG( |
| 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") |
| |
| QUIC_PROTOCOL_FLAG( |
| uint64_t, quic_send_buffer_max_data_slice_size, 4 * 1024, |
| "Max size of data slice in bytes for QUIC stream send buffer.") |
| |
| QUIC_PROTOCOL_FLAG( |
| 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.") |
| |
| QUIC_PROTOCOL_FLAG( |
| double, quic_lumpy_pacing_cwnd_fraction, 0.25f, |
| "Congestion window fraction that the pacing sender allows in bursts " |
| "during pacing.") |
| |
| QUIC_PROTOCOL_FLAG( |
| 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.") |
| |
| QUIC_PROTOCOL_FLAG( |
| 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, |
| false, |
| "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.") |
| |
| QUIC_PROTOCOL_FLAG( |
| 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.") |
| |
| QUIC_PROTOCOL_FLAG( |
| int32_t, quic_bbr2_default_probe_bw_base_duration_ms, 2000, |
| "The default minimum duration for BBRv2-native probes, in milliseconds.") |
| |
| QUIC_PROTOCOL_FLAG( |
| 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.") |
| |
| QUIC_PROTOCOL_FLAG( |
| int32_t, quic_bbr2_default_probe_rtt_period_ms, 10000, |
| "The default period for entering PROBE_RTT, in milliseconds.") |
| |
| QUIC_PROTOCOL_FLAG( |
| double, quic_bbr2_default_loss_threshold, 0.02, |
| "The default loss threshold for QUIC BBRv2, should be a value " |
| "between 0 and 1.") |
| |
| QUIC_PROTOCOL_FLAG( |
| int32_t, quic_bbr2_default_startup_full_loss_count, 8, |
| "The default minimum number of loss marking events to exit STARTUP.") |
| |
| QUIC_PROTOCOL_FLAG( |
| int32_t, quic_bbr2_default_probe_bw_full_loss_count, 2, |
| "The default minimum number of loss marking events to exit PROBE_UP phase.") |
| |
| QUIC_PROTOCOL_FLAG( |
| double, quic_bbr2_default_inflight_hi_headroom, 0.15, |
| "The default fraction of unutilized headroom to try to leave in path " |
| "upon high loss.") |
| |
| QUIC_PROTOCOL_FLAG( |
| int32_t, quic_bbr2_default_initial_ack_height_filter_window, 10, |
| "The default initial value of the max ack height filter's window length.") |
| |
| QUIC_PROTOCOL_FLAG( |
| 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.") |
| |
| QUIC_PROTOCOL_FLAG( |
| int32_t, quic_anti_amplification_factor, 3, |
| "Anti-amplification factor. Before address validation, server will " |
| "send no more than factor times bytes received.") |
| |
| QUIC_PROTOCOL_FLAG( |
| int32_t, quic_max_buffered_crypto_bytes, |
| 16 * 1024, // 16 KB |
| "The maximum amount of CRYPTO frame data that can be buffered.") |
| |
| QUIC_PROTOCOL_FLAG( |
| 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.") |
| |
| QUIC_PROTOCOL_FLAG( |
| 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.") |
| |
| QUIC_PROTOCOL_FLAG( |
| int32_t, quic_max_streams_window_divisor, 2, |
| "The divisor that controls how often MAX_STREAMS frame is sent.") |
| |
| QUIC_PROTOCOL_FLAG( |
| 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.") |
| |
| QUIC_PROTOCOL_FLAG( |
| 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.") |
| |
| QUIC_PROTOCOL_FLAG( |
| 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.") |
| |
| QUIC_PROTOCOL_FLAG(bool, quic_interval_set_enable_add_optimization, true, |
| "If true, enable an optimization in QuicIntervalSet") |
| |
| #endif |
