Hi all, Recently, I’ve been trying to modify netback.c to print network data that is going into the VM. For example, I’m doing an SSL handshake with the VM as the server, and I send the following hexadecimal string from the client to the VM:
160302002f0100002b03026161616161616161616161616161616161616161616161616161616161616161000002000501000000 Now, to read this ingoing data to the VM from netback.c, I’ve been trying to get the sk_buff from the function xenvif_rx_action() and extract the TCP header from it using the tcp_hdr(skb) function. I then try to get the data from the TCP header using the line: (unsigned char *)((unsigned char *)tcph + (tcph->doff * 4)) But I am not able to parse the hexadecimal string as shown above. Printing the userdata portion of the sk_buff, I notice that I get things like the below: \xffffffe9\xffffffe9 0CNCL-FYP03G\xffffff88\xffffffff\xffffffff\xfff\xffffff81\xffffffff\xffffffff\xffffffff\xffffffff\xffffffe8\xffffffbd|G\xffffff88\xffffffff\xffffffff)G\xffffff81\xffffffff\xffffffff\xffffffff\xffffffff The above data was truncated to 104 bytes. Can anyone point me in the right direction regarding this and how to read the above data? Thanks Jatin
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