44 lines
1,016 B
Go
44 lines
1,016 B
Go
//go:build linux
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// +build linux
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package dialer
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import (
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"net"
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"syscall"
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)
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func bindMarkToDialer(mark int, dialer *net.Dialer, _ string, _ net.IP) {
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dialer.Control = bindMarkToControl(mark, dialer.Control)
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}
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func bindMarkToListenConfig(mark int, lc *net.ListenConfig, _, address string) {
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lc.Control = bindMarkToControl(mark, lc.Control)
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}
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func bindMarkToControl(mark int, chain controlFn) controlFn {
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return func(network, address string, c syscall.RawConn) (err error) {
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defer func() {
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if err == nil && chain != nil {
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err = chain(network, address, c)
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}
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}()
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ipStr, _, err := net.SplitHostPort(address)
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if err == nil {
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ip := net.ParseIP(ipStr)
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if ip != nil && !ip.IsGlobalUnicast() {
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return
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}
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}
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return c.Control(func(fd uintptr) {
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switch network {
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case "tcp4", "udp4":
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syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, mark)
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case "tcp6", "udp6":
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syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, mark)
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}
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})
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}
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}
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