minio/internal/http/dial_linux.go

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