>>   This would still have some problems since certain extension headers
>>   (fragmentation, AH, ESP) aren't passed up to the application.
>=> exactly my second concern.

        one question - maybe i have lost some context.
        we are talking about socket API.  is it really necessary
        for user applications to be able to transmit arbitrary AH/ESP/fragment
        header?

        even for raw IP socket, i think it reasonable to forbid users
        from attaching arbitrary AH/ESP/fragment header (i.e. to say that
        they are "kernel" thingie).

itojun
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