nfnetlink_queue interfering with ioctl calls

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Hi

I tried posting this to the netfilter users list but I didn't get any response. Maybe its a question for the devs?

I have code that makes the SIOCGARP ioctl call that works correctly (i.e. it either returns successfully when it finds a match in the arp cache or it returns -1). However when I integrate that same code with nfnetlink_queue code it no longer works as expected (i.e. it returns successfully (0) when the address is not found in the arp cache and it doesn't copy anything into the struct arpreq). I searched the archives and didn't see anything about this. Does anyone have any idea what could be causing this?
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