I wrote a module that puts a netfitler hook on receiving IP packets (NF_IP_PRE_ROUTING).
I want to debug it using UML, but strangely, the skbuf I get in the hook is always NULL.
This looks strange to me as the module has worked in real linux pretty well.
I use linux version 126.96.36.199 for the UML.
Is there some option I need to turn on in the configuration?