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105 lines
3.7 KiB
Go
105 lines
3.7 KiB
Go
// +build linux
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// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package http
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import (
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"context"
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"net"
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"syscall"
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"time"
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"golang.org/x/sys/unix"
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)
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func setInternalTCPParameters(c syscall.RawConn) error {
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return c.Control(func(fdPtr uintptr) {
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// got socket file descriptor to set parameters.
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fd := int(fdPtr)
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// Enable TCP fast connect
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// TCPFastOpenConnect sets the underlying socket to use
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// the TCP fast open connect. This feature is supported
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// since Linux 4.11.
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_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, unix.TCP_FASTOPEN_CONNECT, 1)
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// Enable TCP quick ACK, John Nagle says
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// "Set TCP_QUICKACK. If you find a case where that makes things worse, let me know."
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_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, unix.TCP_QUICKACK, 1)
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// The time (in seconds) the connection needs to remain idle before
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// TCP starts sending keepalive probes, set this to 5 secs
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// system defaults to 7200 secs!!!
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_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPIDLE, 5)
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// Number of probes.
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// ~ cat /proc/sys/net/ipv4/tcp_keepalive_probes (defaults to 9, we reduce it to 5)
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// 9
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_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPCNT, 5)
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// Wait time after successful probe in seconds.
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// ~ cat /proc/sys/net/ipv4/tcp_keepalive_intvl (defaults to 75 secs, we reduce it to 3 secs)
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// 75
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_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPINTVL, 3)
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})
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}
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// DialContext is a function to make custom Dial for internode communications
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type DialContext func(ctx context.Context, network, address string) (net.Conn, error)
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// NewInternodeDialContext setups a custom dialer for internode communication
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func NewInternodeDialContext(dialTimeout time.Duration) DialContext {
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return func(ctx context.Context, network, addr string) (net.Conn, error) {
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dialer := &net.Dialer{
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Timeout: dialTimeout,
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Control: func(network, address string, c syscall.RawConn) error {
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return setInternalTCPParameters(c)
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},
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}
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return dialer.DialContext(ctx, network, addr)
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}
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}
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// NewCustomDialContext setups a custom dialer for any external communication and proxies.
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func NewCustomDialContext(dialTimeout time.Duration) DialContext {
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return func(ctx context.Context, network, addr string) (net.Conn, error) {
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dialer := &net.Dialer{
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Timeout: dialTimeout,
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Control: func(network, address string, c syscall.RawConn) error {
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return c.Control(func(fdPtr uintptr) {
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// got socket file descriptor to set parameters.
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fd := int(fdPtr)
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// Enable TCP fast connect
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// TCPFastOpenConnect sets the underlying socket to use
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// the TCP fast open connect. This feature is supported
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// since Linux 4.11.
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_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, unix.TCP_FASTOPEN_CONNECT, 1)
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// Enable TCP quick ACK, John Nagle says
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// "Set TCP_QUICKACK. If you find a case where that makes things worse, let me know."
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_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, unix.TCP_QUICKACK, 1)
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})
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},
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}
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return dialer.DialContext(ctx, network, addr)
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}
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}
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