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kp
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2021-11-13T23:17:20.779730Z
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pf: ensure we have the correct source/destination IP address in ICMP errors

When we route-to a packet that later turns out to not fit in the
outbound interface MTU we generate an ICMP error.
However, if we've already changed those (i.e. we've passed through a NAT
rule) we have to undo the transformation first.

Obtained from:	pfSense
MFC after:	3 weeks
Sponsored by:	Rubicon Communications, LLC ("Netgate")
Differential Revision:	https://reviews.freebsd.org/D32571

(cherry picked from commit ab238f14544b2415561c4fed674ee360aa8b5860)

Git Hash:   a50876f0ac7a5839531c0c169cb1c88bc6e13389
Git Author: loos@FreeBSD.org
END