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darwin: Detects IP Ver. for NULL Header on Write

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Adds the ability for both IPv4 and IPv6 to be written to the TUN device.
This commit is contained in:
Matthew Ellison
2017-05-12 14:07:24 -04:00
parent 66c5b2f72c
commit da7e7e0a3e
1 changed files with 10 additions and 1 deletions
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11
syscalls_darwin.go
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@@ -159,7 +159,16 @@ func (t *tunReadCloser) Write(from []byte) (int, error) {
}
t.wBuf = t.wBuf[:len(from)+4]
t.wBuf[3] = 2 // Family: IP (2)
// Determine the IP Family for the NULL L2 Header
ipVer := from[0] >> 4
if ipVer == 4 {
t.wBuf[3] = syscall.AF_INET
} else if ipVer == 6 {
t.wBuf[3] = syscall.AF_INET6
} else {
return 0, errors.New("Unable to determine IP version from packet.")
}
copy(t.wBuf[4:], from)
n, err := t.f.Write(t.wBuf)