tun: freebsd: become controlling process when reopening tun FD
When we pass the TUN FD to the child, we have to call TUNSIFPID; otherwise when we close the device, we get a splat in dmesg. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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@ -21,6 +21,7 @@ const (
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_TUNSIFHEAD = 0x80047460
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_TUNSIFMODE = 0x8004745e
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_TUNGIFNAME = 0x4020745d
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_TUNSIFPID = 0x2000745f
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_SIOCGIFINFO_IN6 = 0xc048696c
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_SIOCSIFINFO_IN6 = 0xc048696d
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@ -266,6 +267,15 @@ func CreateTUNFromFile(file *os.File, mtu int) (Device, error) {
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errors: make(chan error, 1),
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}
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var errno syscall.Errno
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tun.operateOnFd(func(fd uintptr) {
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_, _, errno = unix.Syscall(unix.SYS_IOCTL, fd, _TUNSIFPID, uintptr(0))
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})
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if errno != 0 {
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tun.tunFile.Close()
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return nil, fmt.Errorf("unable to become controlling TUN process: %w", errno)
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}
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name, err := tun.Name()
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if err != nil {
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tun.tunFile.Close()
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