[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 #12 from Max <maximos at als.nnov.ru> ---
And the last one... I'm sorry for these listings...

scrub on gre0 max-mss 1360
scrub on gre1 max-mss 1360
(there is no "host unreachable")

22:22:56.728057 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 60681, seq 0, length 1456
22:22:56.728069 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
22:22:56.728078 rule 0..16777216/0(match): pass in on gre0: 10.10.1.1 >
10.10.3.1: ICMP echo request, id 60681, seq 0, length 1458
22:22:56.728089 rule 0..16777216/0(match): pass out on gre1: 10.10.1.1 >
10.10.3.1: ICMP echo request, id 60681, seq 0, length 1458
22:22:56.728097 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 60681, seq 0, length 1456
22:22:56.728140 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
22:22:56.728266 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 60681, seq 0, length 1456
22:22:56.728273 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
22:22:56.728278 rule 0..16777216/0(match): pass in on gre1: 10.10.3.1 >
10.10.1.1: ICMP echo reply, id 60681, seq 0, length 1458
22:22:56.728283 rule 0..16777216/0(match): pass out on gre0: 10.10.3.1 >
10.10.1.1: ICMP echo reply, id 60681, seq 0, length 1458
22:22:56.728288 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 60681, seq 0, length 1456
22:22:56.728325 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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