[Bug 228108] if_ipsec drops all the icmp v4&v6 error messages

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228108

--- Comment #5 from commit-hook at freebsd.org ---
A commit references this bug:

Author: ae
Date: Fri May 11 16:50:26 UTC 2018
New revision: 333497
URL: https://svnweb.freebsd.org/changeset/base/333497

Log:
  Apply the change from r272770 to if_ipsec(4) interface.

  It is guaranteed that if_ipsec(4) interface is used only for tunnel
  mode IPsec, i.e. decrypted and decapsultaed packet has its own IP header.
  Thus we can consider it as new packet and clear the protocols flags.
  This allows ICMP/ICMPv6 properly handle errors that may cause this packet.

  PR:           228108
  MFC after:    1 week

Changes:
  head/sys/net/if_ipsec.c

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