1 // Copyright (c) 2020 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 // NOLINT(build/header_guard) 6 // This file intentionally does not have header guards, it's intended to be 7 // included multiple times, each time with a different definition of 8 // QUIC_PROTOCOL_FLAG. 9 10 #if defined(QUIC_PROTOCOL_FLAG) 11 12 QUIC_PROTOCOL_FLAG( 13 bool, quic_allow_chlo_buffering, true, 14 "If true, allows packets to be buffered in anticipation of a " 15 "future CHLO, and allow CHLO packets to be buffered until next " 16 "iteration of the event loop.") 17 18 QUIC_PROTOCOL_FLAG(bool, quic_disable_pacing_for_perf_tests, false, 19 "If true, disable pacing in QUIC") 20 21 // Note that single-packet CHLOs are only enforced for Google QUIC versions that 22 // do not use CRYPTO frames. This currently means only Q043 and Q046. All other 23 // versions of QUIC (both Google QUIC and IETF) allow multi-packet CHLOs 24 // regardless of the value of this flag. 25 QUIC_PROTOCOL_FLAG(bool, quic_enforce_single_packet_chlo, true, 26 "If true, enforce that sent QUIC CHLOs fit in one packet. " 27 "Only applies to Q043 and Q046.") 28 29 // Currently, this number is quite conservative. At a hypothetical 1000 qps, 30 // this means that the longest time-wait list we should see is: 31 // 200 seconds * 1000 qps = 200000. 32 // Of course, there are usually many queries per QUIC connection, so we allow a 33 // factor of 3 leeway. 34 QUIC_PROTOCOL_FLAG(int64_t, quic_time_wait_list_max_connections, 600000, 35 "Maximum number of connections on the time-wait list. " 36 "A negative value implies no configured limit.") 37 38 QUIC_PROTOCOL_FLAG(int64_t, quic_time_wait_list_seconds, 200, 39 "Time period for which a given connection_id should live in " 40 "the time-wait state.") 41 42 // This number is relatively conservative. For example, there are at most 1K 43 // queued stateless resets, which consume 1K * 21B = 21KB. 44 QUIC_PROTOCOL_FLAG( 45 uint64_t, quic_time_wait_list_max_pending_packets, 1024, 46 "Upper limit of pending packets in time wait list when writer is blocked.") 47 48 // Stop sending a reset if the recorded number of addresses that server has 49 // recently sent stateless reset to exceeds this limit. 50 QUIC_PROTOCOL_FLAG(uint64_t, quic_max_recent_stateless_reset_addresses, 1024, 51 "Max number of recorded recent reset addresses.") 52 53 // After this timeout, recent reset addresses will be cleared. 54 // FLAGS_quic_max_recent_stateless_reset_addresses * (1000ms / 55 // FLAGS_quic_recent_stateless_reset_addresses_lifetime_ms) is roughly the max 56 // reset per second. For example, 1024 * (1000ms / 1000ms) = 1K reset per 57 // second. 58 QUIC_PROTOCOL_FLAG( 59 uint64_t, quic_recent_stateless_reset_addresses_lifetime_ms, 1000, 60 "Max time that a client address lives in recent reset addresses set.") 61 62 QUIC_PROTOCOL_FLAG(double, quic_bbr_cwnd_gain, 2.0f, 63 "Congestion window gain for QUIC BBR during PROBE_BW phase.") 64 65 QUIC_PROTOCOL_FLAG( 66 int32_t, quic_buffered_data_threshold, 8 * 1024, 67 "If buffered data in QUIC stream is less than this " 68 "threshold, buffers all provided data or asks upper layer for more data") 69 70 QUIC_PROTOCOL_FLAG( 71 uint64_t, quic_send_buffer_max_data_slice_size, 4 * 1024, 72 "Max size of data slice in bytes for QUIC stream send buffer.") 73 74 QUIC_PROTOCOL_FLAG( 75 int32_t, quic_lumpy_pacing_size, 2, 76 "Number of packets that the pacing sender allows in bursts during " 77 "pacing. This flag is ignored if a flow's estimated bandwidth is " 78 "lower than 1200 kbps.") 79 80 QUIC_PROTOCOL_FLAG( 81 double, quic_lumpy_pacing_cwnd_fraction, 0.25f, 82 "Congestion window fraction that the pacing sender allows in bursts " 83 "during pacing.") 84 85 QUIC_PROTOCOL_FLAG( 86 int32_t, quic_lumpy_pacing_min_bandwidth_kbps, 1200, 87 "The minimum estimated client bandwidth below which the pacing sender will " 88 "not allow bursts.") 89 90 QUIC_PROTOCOL_FLAG(int32_t, quic_max_pace_time_into_future_ms, 10, 91 "Max time that QUIC can pace packets into the future in ms.") 92 93 QUIC_PROTOCOL_FLAG( 94 double, quic_pace_time_into_future_srtt_fraction, 95 0.125f, // One-eighth smoothed RTT 96 "Smoothed RTT fraction that a connection can pace packets into the future.") 97 98 QUIC_PROTOCOL_FLAG(bool, quic_export_write_path_stats_at_server, false, 99 "If true, export detailed write path statistics at server.") 100 101 QUIC_PROTOCOL_FLAG(bool, quic_disable_version_negotiation_grease_randomness, 102 false, 103 "If true, use predictable version negotiation versions.") 104 105 QUIC_PROTOCOL_FLAG(bool, quic_enable_http3_grease_randomness, true, 106 "If true, use random greased settings and frames.") 107 108 QUIC_PROTOCOL_FLAG(int64_t, quic_max_tracked_packet_count, 10000, 109 "Maximum number of tracked packets.") 110 111 QUIC_PROTOCOL_FLAG( 112 bool, quic_client_convert_http_header_name_to_lowercase, true, 113 "If true, HTTP request header names sent from QuicSpdyClientBase(and " 114 "descendents) will be automatically converted to lower case.") 115 116 QUIC_PROTOCOL_FLAG( 117 int32_t, quic_bbr2_default_probe_bw_base_duration_ms, 2000, 118 "The default minimum duration for BBRv2-native probes, in milliseconds.") 119 120 QUIC_PROTOCOL_FLAG( 121 int32_t, quic_bbr2_default_probe_bw_max_rand_duration_ms, 1000, 122 "The default upper bound of the random amount of BBRv2-native " 123 "probes, in milliseconds.") 124 125 QUIC_PROTOCOL_FLAG( 126 int32_t, quic_bbr2_default_probe_rtt_period_ms, 10000, 127 "The default period for entering PROBE_RTT, in milliseconds.") 128 129 QUIC_PROTOCOL_FLAG( 130 double, quic_bbr2_default_loss_threshold, 0.02, 131 "The default loss threshold for QUIC BBRv2, should be a value " 132 "between 0 and 1.") 133 134 QUIC_PROTOCOL_FLAG( 135 int32_t, quic_bbr2_default_startup_full_loss_count, 8, 136 "The default minimum number of loss marking events to exit STARTUP.") 137 138 QUIC_PROTOCOL_FLAG( 139 int32_t, quic_bbr2_default_probe_bw_full_loss_count, 2, 140 "The default minimum number of loss marking events to exit PROBE_UP phase.") 141 142 QUIC_PROTOCOL_FLAG( 143 double, quic_bbr2_default_inflight_hi_headroom, 0.15, 144 "The default fraction of unutilized headroom to try to leave in path " 145 "upon high loss.") 146 147 QUIC_PROTOCOL_FLAG( 148 int32_t, quic_bbr2_default_initial_ack_height_filter_window, 10, 149 "The default initial value of the max ack height filter's window length.") 150 151 QUIC_PROTOCOL_FLAG( 152 double, quic_ack_aggregation_bandwidth_threshold, 1.0, 153 "If the bandwidth during ack aggregation is smaller than (estimated " 154 "bandwidth * this flag), consider the current aggregation completed " 155 "and starts a new one.") 156 157 QUIC_PROTOCOL_FLAG( 158 int32_t, quic_anti_amplification_factor, 3, 159 "Anti-amplification factor. Before address validation, server will " 160 "send no more than factor times bytes received.") 161 162 QUIC_PROTOCOL_FLAG( 163 int32_t, quic_max_buffered_crypto_bytes, 164 16 * 1024, // 16 KB 165 "The maximum amount of CRYPTO frame data that can be buffered.") 166 167 QUIC_PROTOCOL_FLAG( 168 int32_t, quic_max_aggressive_retransmittable_on_wire_ping_count, 5, 169 "Maximum number of consecutive pings that can be sent with the " 170 "aggressive initial retransmittable on the wire timeout if there is " 171 "no new stream data received. After this limit, the timeout will be " 172 "doubled each ping until it exceeds the default ping timeout.") 173 174 QUIC_PROTOCOL_FLAG( 175 int32_t, quic_max_retransmittable_on_wire_ping_count, 1000, 176 "Maximum number of pings that can be sent with the retransmittable " 177 "on the wire timeout, over the lifetime of a connection. After this " 178 "limit, the timeout will be the default ping timeout.") 179 180 QUIC_PROTOCOL_FLAG(int32_t, quic_max_congestion_window, 2000, 181 "The maximum congestion window in packets.") 182 183 QUIC_PROTOCOL_FLAG( 184 int32_t, quic_max_streams_window_divisor, 2, 185 "The divisor that controls how often MAX_STREAMS frame is sent.") 186 187 QUIC_PROTOCOL_FLAG( 188 uint64_t, quic_key_update_confidentiality_limit, 0, 189 "If non-zero and key update is allowed, the maximum number of " 190 "packets sent for each key phase before initiating a key update.") 191 192 QUIC_PROTOCOL_FLAG(bool, quic_disable_client_tls_zero_rtt, false, 193 "If true, QUIC client with TLS will not try 0-RTT.") 194 195 QUIC_PROTOCOL_FLAG(bool, quic_disable_server_tls_resumption, false, 196 "If true, QUIC server will disable TLS resumption by not " 197 "issuing or processing session tickets.") 198 199 QUIC_PROTOCOL_FLAG(bool, quic_defer_send_in_response, true, 200 "If true, QUIC servers will defer sending in response to " 201 "incoming packets by default.") 202 203 QUIC_PROTOCOL_FLAG( 204 bool, quic_header_size_limit_includes_overhead, true, 205 "If true, QUIC QPACK decoder includes 32-bytes overheader per entry while " 206 "comparing request/response header size against its upper limit.") 207 208 QUIC_PROTOCOL_FLAG( 209 bool, quic_reject_retry_token_in_initial_packet, false, 210 "If true, always reject retry_token received in INITIAL packets") 211 212 QUIC_PROTOCOL_FLAG(bool, quic_use_lower_server_response_mtu_for_test, false, 213 "If true, cap server response packet size at 1250.") 214 215 QUIC_PROTOCOL_FLAG(bool, quic_enforce_strict_amplification_factor, false, 216 "If true, enforce strict amplification factor") 217 218 QUIC_PROTOCOL_FLAG(bool, quic_bounded_crypto_send_buffer, false, 219 "If true, close the connection if a crypto send buffer " 220 "exceeds its size limit.") 221 222 QUIC_PROTOCOL_FLAG(bool, quic_interval_set_enable_add_optimization, true, 223 "If true, enable an optimization in QuicIntervalSet") 224 225 QUIC_PROTOCOL_FLAG( 226 bool, quic_enable_chaos_protection, true, 227 "If true, use chaos protection to randomize client initials.") 228 229 #endif 230