About packet format

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Hi all,
I am new here and glad to see you guys.
Thanks for your hard work for providing a more stable, powerful,functional ceph.
I was reading the source code of Ceph-0.72.2, and I've got a question:
what is the data packet format of Ceph?Or how are the packets packaged?

We know that typical tcp packets look like this:
TCP pseudo-header for checksum computation (IPv4)
Bit offset 0–34–7 8–1516–31
0Source address
32Destination address
64Zeros ProtocolTCP length
96Source portDestination port
128Sequence number
160 Acknowledgement number
192Data offset ReservedFlags Window
224 ChecksumUrgent pointer
256 Options (optional)
256/288+ 
Data
Is data transfered by ceph also like this?
Also I want to know where are the data structure defined, please tell me.
Thanks.
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