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41 lines
866 B
Go
41 lines
866 B
Go
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// +build linux
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package redir
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import (
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"net"
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"syscall"
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)
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func setsockopt(rc syscall.RawConn, addr string) error {
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isIPv6 := true
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host, _, err := net.SplitHostPort(addr)
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if err != nil {
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return err
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}
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ip := net.ParseIP(host)
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if ip != nil && ip.To4() != nil {
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isIPv6 = false
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}
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rc.Control(func(fd uintptr) {
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err = syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
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if err == nil {
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err = syscall.SetsockoptInt(int(fd), syscall.SOL_IP, syscall.IP_TRANSPARENT, 1)
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}
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if err == nil && isIPv6 {
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err = syscall.SetsockoptInt(int(fd), syscall.SOL_IPV6, IPV6_TRANSPARENT, 1)
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}
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if err == nil {
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err = syscall.SetsockoptInt(int(fd), syscall.SOL_IP, syscall.IP_RECVORIGDSTADDR, 1)
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}
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if err == nil && isIPv6 {
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err = syscall.SetsockoptInt(int(fd), syscall.SOL_IPV6, IPV6_RECVORIGDSTADDR, 1)
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}
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})
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return err
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}
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