[Bug 207598] pf adds icmp unreach on gre/ipsec somehow

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207598

--- Comment #15 from Max <maximos at als.nnov.ru> ---
scrub on gre0
scrub on gre1

14:39:39.127649 rule 0..16777216/0(match): pass in on em0: 192.168.10.1 >
192.168.10.254: GREv0, proto IPv4 (0x0800), length 1480: 10.10.1.1 > 10.10.3.1:
ICMP echo request, id 47622, seq 0, length 1456
14:39:39.127666 rule 0..16777216/0(match): pass in on em0: 192.168.10.1 >
192.168.10.254: GREv0, proto IPv4 (0x0800), length 26: 10.10.1.1 > 10.10.3.1:
ip-proto-1
14:39:39.127672 rule 0..16777216/0(match): pass in on gre0: 10.10.1.1 >
10.10.3.1: ICMP echo request, id 47622, seq 0, length 1458
14:39:39.127681 rule 0..16777216/0(match): pass out on gre1: 10.10.1.1 >
10.10.3.1: ICMP echo request, id 47622, seq 0, length 1458
14:39:39.127689 rule 0..16777216/0(match): pass out on em2: 192.168.30.254 >
192.168.30.1: GREv0, proto IPv4 (0x0800), length 1480: 10.10.1.1 > 10.10.3.1:
ICMP echo request, id 47622, seq 0, length 1456
14:39:39.127734 rule 0..16777216/0(match): pass out on em2: 192.168.30.254 >
192.168.30.1: GREv0, proto IPv4 (0x0800), length 26: 10.10.1.1 > 10.10.3.1:
ip-proto-1
14:39:39.127857 rule 0..16777216/0(match): pass in on em2: 192.168.30.1 >
192.168.30.254: GREv0, proto IPv4 (0x0800), length 1480: 10.10.3.1 > 10.10.1.1:
ICMP echo reply, id 47622, seq 0, length 1456
14:39:39.127865 rule 0..16777216/0(match): pass in on em2: 192.168.30.1 >
192.168.30.254: GREv0, proto IPv4 (0x0800), length 26: 10.10.3.1 > 10.10.1.1:
ip-proto-1
14:39:39.127869 rule 0..16777216/0(match): pass in on gre1: 10.10.3.1 >
10.10.1.1: ICMP echo reply, id 47622, seq 0, length 1458
14:39:39.127875 rule 0..16777216/0(match): pass out on gre0: 10.10.3.1 >
10.10.1.1: ICMP echo reply, id 47622, seq 0, length 1458
14:39:39.127880 rule 0..16777216/0(match): pass out on em0: 192.168.10.254 >
192.168.10.1: GREv0, proto IPv4 (0x0800), length 1480: 10.10.3.1 > 10.10.1.1:
ICMP echo reply, id 47622, seq 0, length 1456
14:39:39.127917 rule 0..16777216/0(match): pass out on em0: 192.168.10.254 >
192.168.10.1: GREv0, proto IPv4 (0x0800), length 26: 10.10.3.1 > 10.10.1.1:
ip-proto-1

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