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test adding BindToDevice to linux. if it works then we'll want to rethink slightly how we get the tcpContext on every platform, to make this compile everywhere and look a little cleaner
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@ -299,6 +299,7 @@ func (t *tcp) call(saddr string, options interface{}, sintf string, upgrade *Tcp
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Timeout: time.Second * 5,
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}
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if sintf != "" {
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dialer.Control = t.getContextWithBindToDevice(sintf)
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ief, err := net.InterfaceByName(sintf)
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if err != nil {
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return
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@ -29,3 +29,17 @@ func (t *tcp) tcpContext(network, address string, c syscall.RawConn) error {
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// Return nil because errors here are not considered fatal for the connection, it just means congestion control is suboptimal
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return nil
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}
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func (t *tcp) getContextWithBindToDevice(sintf string) func(string, string, syscall.RawConn) error {
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return func(network, address string, c syscall.RawConn) error {
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var err error
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btd := func(fd uintptr) {
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err = unix.BindToDevice(int(fd), sintf)
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}
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c.Control(btd)
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if err != nil {
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t.link.core.log.Debugln("Failed to set SO_BINDTODEVICE:", sintf)
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}
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return t.tcpContext(network, address, c)
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}
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}
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