Netfilter callbacks and UDP fragmenting

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Hi,
are UDP packets defragmented before are passed to netfilter callback
functions (e.g. PREROUTING) or developer has to create buffer and
defragment by himself, to release memory when a fragment is missing,
etc. - is there a working implementation/example? How about locally
generated packets in OUTPUT callback? 

I've looked e.g. in nf_conntrack_sip.c and I can't see any extra
defragmentation code even SIP message can be fragmented, especially SDP
content.

Thanks
Tomas

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