ccce324dab
Currently the SYN RTO schedule follows an exponential backoff scheme, which can be unnecessarily conservative in cases where there are link failures. In such cases, it's better to aggressively try to retransmit packets, so it takes routers less time to find a repath with a working link. We chose a default value for this sysctl of 4, to follow the macOS and IOS backoff scheme of 1,1,1,1,1,2,4,8, ... MacOS and IOS have used this backoff schedule for over a decade, since before this 2009 IETF presentation discussed the behavior: https://www.ietf.org/proceedings/75/slides/tcpm-1.pdf This commit makes the SYN RTO schedule start with a number of linear backoffs given by the following sysctl: * tcp_syn_linear_timeouts This changes the SYN RTO scheme to be: init_rto_val for tcp_syn_linear_timeouts, exp backoff starting at init_rto_val For example if init_rto_val = 1 and tcp_syn_linear_timeouts = 2, our backoff scheme would be: 1, 1, 1, 2, 4, 8, 16, ... Signed-off-by: David Morley <morleyd@google.com> Signed-off-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Neal Cardwell <ncardwell@google.com> Tested-by: David Morley <morleyd@google.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Link: https://lore.kernel.org/r/20230509180558.2541885-1-morleyd.kernel@gmail.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>
243 lines
6.0 KiB
C
243 lines
6.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* ipv4 in net namespaces
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*/
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#ifndef __NETNS_IPV4_H__
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#define __NETNS_IPV4_H__
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#include <linux/uidgid.h>
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#include <net/inet_frag.h>
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#include <linux/rcupdate.h>
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#include <linux/seqlock.h>
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#include <linux/siphash.h>
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struct ctl_table_header;
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struct ipv4_devconf;
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struct fib_rules_ops;
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struct hlist_head;
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struct fib_table;
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struct sock;
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struct local_ports {
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seqlock_t lock;
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int range[2];
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bool warned;
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};
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struct ping_group_range {
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seqlock_t lock;
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kgid_t range[2];
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};
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struct inet_hashinfo;
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struct inet_timewait_death_row {
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refcount_t tw_refcount;
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/* Padding to avoid false sharing, tw_refcount can be often written */
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struct inet_hashinfo *hashinfo ____cacheline_aligned_in_smp;
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int sysctl_max_tw_buckets;
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};
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struct tcp_fastopen_context;
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struct netns_ipv4 {
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struct inet_timewait_death_row tcp_death_row;
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struct udp_table *udp_table;
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#ifdef CONFIG_SYSCTL
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struct ctl_table_header *forw_hdr;
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struct ctl_table_header *frags_hdr;
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struct ctl_table_header *ipv4_hdr;
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struct ctl_table_header *route_hdr;
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struct ctl_table_header *xfrm4_hdr;
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#endif
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struct ipv4_devconf *devconf_all;
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struct ipv4_devconf *devconf_dflt;
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struct ip_ra_chain __rcu *ra_chain;
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struct mutex ra_mutex;
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#ifdef CONFIG_IP_MULTIPLE_TABLES
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struct fib_rules_ops *rules_ops;
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struct fib_table __rcu *fib_main;
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struct fib_table __rcu *fib_default;
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unsigned int fib_rules_require_fldissect;
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bool fib_has_custom_rules;
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#endif
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bool fib_has_custom_local_routes;
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bool fib_offload_disabled;
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#ifdef CONFIG_IP_ROUTE_CLASSID
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atomic_t fib_num_tclassid_users;
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#endif
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struct hlist_head *fib_table_hash;
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struct sock *fibnl;
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struct sock *mc_autojoin_sk;
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struct inet_peer_base *peers;
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struct fqdir *fqdir;
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u8 sysctl_icmp_echo_ignore_all;
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u8 sysctl_icmp_echo_enable_probe;
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u8 sysctl_icmp_echo_ignore_broadcasts;
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u8 sysctl_icmp_ignore_bogus_error_responses;
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u8 sysctl_icmp_errors_use_inbound_ifaddr;
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int sysctl_icmp_ratelimit;
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int sysctl_icmp_ratemask;
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u32 ip_rt_min_pmtu;
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int ip_rt_mtu_expires;
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int ip_rt_min_advmss;
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struct local_ports ip_local_ports;
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u8 sysctl_tcp_ecn;
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u8 sysctl_tcp_ecn_fallback;
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u8 sysctl_ip_default_ttl;
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u8 sysctl_ip_no_pmtu_disc;
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u8 sysctl_ip_fwd_use_pmtu;
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u8 sysctl_ip_fwd_update_priority;
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u8 sysctl_ip_nonlocal_bind;
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u8 sysctl_ip_autobind_reuse;
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/* Shall we try to damage output packets if routing dev changes? */
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u8 sysctl_ip_dynaddr;
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u8 sysctl_ip_early_demux;
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#ifdef CONFIG_NET_L3_MASTER_DEV
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u8 sysctl_raw_l3mdev_accept;
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#endif
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u8 sysctl_tcp_early_demux;
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u8 sysctl_udp_early_demux;
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u8 sysctl_nexthop_compat_mode;
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u8 sysctl_fwmark_reflect;
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u8 sysctl_tcp_fwmark_accept;
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#ifdef CONFIG_NET_L3_MASTER_DEV
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u8 sysctl_tcp_l3mdev_accept;
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#endif
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u8 sysctl_tcp_mtu_probing;
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int sysctl_tcp_mtu_probe_floor;
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int sysctl_tcp_base_mss;
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int sysctl_tcp_min_snd_mss;
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int sysctl_tcp_probe_threshold;
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u32 sysctl_tcp_probe_interval;
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int sysctl_tcp_keepalive_time;
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int sysctl_tcp_keepalive_intvl;
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u8 sysctl_tcp_keepalive_probes;
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u8 sysctl_tcp_syn_retries;
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u8 sysctl_tcp_synack_retries;
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u8 sysctl_tcp_syncookies;
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u8 sysctl_tcp_migrate_req;
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u8 sysctl_tcp_comp_sack_nr;
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int sysctl_tcp_reordering;
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u8 sysctl_tcp_retries1;
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u8 sysctl_tcp_retries2;
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u8 sysctl_tcp_orphan_retries;
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u8 sysctl_tcp_tw_reuse;
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int sysctl_tcp_fin_timeout;
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unsigned int sysctl_tcp_notsent_lowat;
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u8 sysctl_tcp_sack;
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u8 sysctl_tcp_window_scaling;
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u8 sysctl_tcp_timestamps;
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u8 sysctl_tcp_early_retrans;
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u8 sysctl_tcp_recovery;
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u8 sysctl_tcp_thin_linear_timeouts;
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u8 sysctl_tcp_slow_start_after_idle;
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u8 sysctl_tcp_retrans_collapse;
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u8 sysctl_tcp_stdurg;
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u8 sysctl_tcp_rfc1337;
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u8 sysctl_tcp_abort_on_overflow;
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u8 sysctl_tcp_fack; /* obsolete */
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int sysctl_tcp_max_reordering;
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int sysctl_tcp_adv_win_scale;
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u8 sysctl_tcp_dsack;
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u8 sysctl_tcp_app_win;
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u8 sysctl_tcp_frto;
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u8 sysctl_tcp_nometrics_save;
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u8 sysctl_tcp_no_ssthresh_metrics_save;
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u8 sysctl_tcp_moderate_rcvbuf;
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u8 sysctl_tcp_tso_win_divisor;
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u8 sysctl_tcp_workaround_signed_windows;
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int sysctl_tcp_limit_output_bytes;
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int sysctl_tcp_challenge_ack_limit;
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int sysctl_tcp_min_rtt_wlen;
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u8 sysctl_tcp_min_tso_segs;
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u8 sysctl_tcp_tso_rtt_log;
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u8 sysctl_tcp_autocorking;
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u8 sysctl_tcp_reflect_tos;
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int sysctl_tcp_invalid_ratelimit;
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int sysctl_tcp_pacing_ss_ratio;
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int sysctl_tcp_pacing_ca_ratio;
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int sysctl_tcp_wmem[3];
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int sysctl_tcp_rmem[3];
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unsigned int sysctl_tcp_child_ehash_entries;
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unsigned long sysctl_tcp_comp_sack_delay_ns;
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unsigned long sysctl_tcp_comp_sack_slack_ns;
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int sysctl_max_syn_backlog;
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int sysctl_tcp_fastopen;
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const struct tcp_congestion_ops __rcu *tcp_congestion_control;
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struct tcp_fastopen_context __rcu *tcp_fastopen_ctx;
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unsigned int sysctl_tcp_fastopen_blackhole_timeout;
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atomic_t tfo_active_disable_times;
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unsigned long tfo_active_disable_stamp;
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u32 tcp_challenge_timestamp;
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u32 tcp_challenge_count;
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u8 sysctl_tcp_plb_enabled;
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u8 sysctl_tcp_plb_idle_rehash_rounds;
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u8 sysctl_tcp_plb_rehash_rounds;
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u8 sysctl_tcp_plb_suspend_rto_sec;
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int sysctl_tcp_plb_cong_thresh;
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int sysctl_udp_wmem_min;
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int sysctl_udp_rmem_min;
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u8 sysctl_fib_notify_on_flag_change;
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u8 sysctl_tcp_syn_linear_timeouts;
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#ifdef CONFIG_NET_L3_MASTER_DEV
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u8 sysctl_udp_l3mdev_accept;
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#endif
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u8 sysctl_igmp_llm_reports;
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int sysctl_igmp_max_memberships;
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int sysctl_igmp_max_msf;
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int sysctl_igmp_qrv;
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struct ping_group_range ping_group_range;
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atomic_t dev_addr_genid;
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unsigned int sysctl_udp_child_hash_entries;
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#ifdef CONFIG_SYSCTL
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unsigned long *sysctl_local_reserved_ports;
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int sysctl_ip_prot_sock;
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#endif
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#ifdef CONFIG_IP_MROUTE
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#ifndef CONFIG_IP_MROUTE_MULTIPLE_TABLES
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struct mr_table *mrt;
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#else
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struct list_head mr_tables;
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struct fib_rules_ops *mr_rules_ops;
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#endif
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#endif
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#ifdef CONFIG_IP_ROUTE_MULTIPATH
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u32 sysctl_fib_multipath_hash_fields;
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u8 sysctl_fib_multipath_use_neigh;
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u8 sysctl_fib_multipath_hash_policy;
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#endif
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struct fib_notifier_ops *notifier_ops;
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unsigned int fib_seq; /* protected by rtnl_mutex */
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struct fib_notifier_ops *ipmr_notifier_ops;
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unsigned int ipmr_seq; /* protected by rtnl_mutex */
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atomic_t rt_genid;
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siphash_key_t ip_id_key;
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};
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#endif
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