[MirageOS-devel] alteration of tcp payload

[Michael Moon <michaelmoon.pr@xxxxxxxxx>]

I am sending some data over a tcp connection, and I found that for a xen unikernel, data is changed to some arbitrary bit string of the same length. Looking at netif.ml and writev function, I noticed that tcp packet is split into two pages: first page (first_page variable) contains the headers, and the second page contains the payload. Dumping pages in writev function shows that payload is passed correctly to the function write_request, but tcp_dump on the interface captures a different payload data that looks arbitrary. Even if I modify writev to replace my payload with a string of predefined characters (let us say all zeros), I still observe a different payload coming out of the interface.

Any idea?

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