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mark_linux.go
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mark_linux.go
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// +build linux
package markedconn
import (
"net"
"syscall"
"go.uber.org/zap"
)
func makeDialer(mark int, platformData *PlatformData) net.Dialer {
return net.Dialer{
Control: func(_, _ string, c syscall.RawConn) error {
return c.Control(func(fd uintptr) {
if err := syscall.SetNonblock(int(fd), false); err != nil {
zap.L().Error("unable to set socket options", zap.Error(err))
}
if err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, mark); err != nil {
zap.L().Error("Failed to assing mark to socket", zap.Error(err))
}
if err := syscall.SetsockoptInt(int(fd), syscall.SOL_TCP, 30, 1); err != nil {
zap.L().Debug("Failed to set fast open socket option", zap.Error(err))
}
})
},
}
}
func makeListenerConfig(mark int) net.ListenConfig {
return net.ListenConfig{
Control: func(_, _ string, c syscall.RawConn) error {
return c.Control(func(fd uintptr) {
if err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, mark); err != nil {
zap.L().Error("Failed to mark connection", zap.Error(err))
}
if err := syscall.SetsockoptInt(int(fd), syscall.SOL_TCP, 23, 16*1024); err != nil {
zap.L().Error("Cannot set tcp fast open options", zap.Error(err))
}
})
},
}
}