about PF log problem

[Ken]

I do not set any options in PF ,but what is as follows

tcpdump -n -e -ttt -r /var/log/pflog
124. 988648 rule 4294967295/unkn(8): pass in on tun0: 192.168.0.70 > 
224.0.0.1: igmp query v3
124. 988657 rule 4294967295/unkn(8): pass in on tun0: 192.168.0.70 > 
224.0.0.1: igmp query v3
124. 988650 rule 4294967295/unkn(8): pass in on tun0: 192.168.0.70 > 
224.0.0.1: igmp query v3
124. 988649 rule 4294967295/unkn(8): pass in on tun0: 192.168.0.70 > 
224.0.0.1: igmp query v3
124. 988652 rule 4294967295/unkn(8): pass in on tun0: 192.168.0.70 > 
224.0.0.1: igmp query v3