ipfilter not creating entries in the state table

[Steffen Rick]

Hi,

hoping you guys can help me with this. I'm somehow unable to create an
ipfilter configuration that will use stateful filtering on IPv6. What
I have is a very simple ipf.rules file:

ipf.rules:
pass in quick on lo0 all
pass out quick on lo0 all

pass out quick on re0 all keep state

pass in quick on re0 proto tcp from any to any port = 22

block in log quick on re0 all

default kernel wise is to accept traffic
(I do this to not log myself out when working remotely)

When I lookup www.google.com over IPv4 I get an entry in the state table

dig -A www.google.com @8.8.8.8
ipfstat -t
Src: 0.0.0.0, Dest: 0.0.0.0, Proto: any, Sorted by: # bytes

Source IP             Destination IP         ST   PR   #pkts    #bytes       ttl
188.40.60.69,22       80.79.143.188,47160   4/4  tcp      75     14048 119:59:59
188.40.60.96,51126    8.8.8.8,53            0/0  udp       1        83      0:03

When I try to lookup the A record on the IPv6 server I get no state table entry

dig -A www.google.com @2001:4860:4860::8888
no state table entry and no response from the server

tcpdump -nnn host 2001:4860:4860::8888
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on re0, link-type EN10MB (Ethernet), capture size 262144 bytes
16:48:48.588867 IP6 2a01:4f8:221:181::2.62706 > 2001:4860:4860::8888.53: 15010+ [1au] A? www.google.com. (55)
16:48:48.602580 IP6 2001:4860:4860::8888.53 > 2a01:4f8:221:181::2.62706: 15010 1/0/1 A 216.58.206.4 (59)
16:48:53.663637 IP6 2a01:4f8:221:181::2.62706 > 2001:4860:4860::8888.53: 15010+ [1au] A? www.google.com. (55)
16:48:53.668845 IP6 2001:4860:4860::8888.53 > 2a01:4f8:221:181::2.62706: 15010 1/0/1 A 216.58.206.4 (59)
16:48:58.744154 IP6 2a01:4f8:221:181::2.62706 > 2001:4860:4860::8888.53: 15010+ [1au] A? www.google.com. (55)
16:48:58.764794 IP6 2001:4860:4860::8888.53 > 2a01:4f8:221:181::2.62706: 15010 1/0/1 A 216.58.206.4 (59)
^C

The request seems to have gone through just fine but my dig client times out.

I change the ruleset to include

pass in quick on re0 inet6 proto tcp from any port = 53
pass in quick on re0 inet6 proto udp from any port = 53

and then I'm obviously able to get a response from the server.

tcpdump -nnn host 2001:4860:4860::8888
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on re0, link-type EN10MB (Ethernet), capture size 262144 bytes
16:47:36.738177 IP6 2a01:4f8:221:181::2.40852 > 2001:4860:4860::8888.53: 54683+ [1au] A? www.google.com. (55)
16:47:36.751447 IP6 2001:4860:4860::8888.53 > 2a01:4f8:221:181::2.40852: 54683 1/0/1 A 172.217.18.164 (59)
^C

That obiously ignores the statefulness of the firewall. Is this a
known issue? Has anyone ipfilter working with stateful rules correctly
being created when making outbound requests?

Any help appreciated!

Thanks,
Steffen