debug bpf code on netlink messages - debugging

Question

I am writing a bpf filter to prevent certain netlink messages. I am trying to debug the bpf code. Is there any debug tool that could help me?
I was initially thinking of using nlmon to capture netlink messages:
From https://jvns.ca/blog/2017/09/03/debugging-netlink-requests/
# create the network interface
sudo ip link add nlmon0 type nlmon
sudo ip link set dev nlmon0 up
sudo tcpdump -i nlmon0 -w netlink.pcap # capture your packets
Then use ./bpf_dbg (
https://github.com/cloudflare/bpftools/blob/master/linux_tools/bpf_dbg.c)
1) ./bpf_dbg to enter the shell (shell cmds denoted with '>'):
2) > load bpf 6,40 0 0 12,21 0 3 20... (this is the bpf code I intend to debug)
3) > load pcap netlink.pcap
4) > run /disassemble/dump/quit (self-explanatory)
5) > breakpoint 2 (sets bp at loaded BPF insns 2, do run then;
multiple bps can be set, of course, a call to breakpoint
w/o args shows currently loaded bps, breakpoint reset for
resetting all breakpoints)
6) > select 3 (run etc will start from the 3rd packet in the pcap)
7) > step [-, +] (performs single stepping through the BPF)
Did anyone try this before?
Also, I was not able to make nlmon module to load on my linux kernel(Is there a doc for this?)
I am running kernel version Linux version 4.10.0-40-generic
The nlmon module seems to be present in the kernel source:
https://elixir.free-electrons.com/linux/v4.10/source/drivers/net/nlmon.c#L41
But, when I search inside, /lib/modules/ for nlmon.ko I dont find anything.
instance-1:/lib/modules$ find . | grep -i nlmon
instance-1:/lib/modules$