/usr/share/shorewall/macro.IPsecnat is in shorewall 4.6.4.3-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Shorewall version 4 - IPsecnat Macro
#
# /usr/share/shorewall/macro.IPsecnat
#
# This macro (bidirectional) handles IPsec traffic and Nat-Traversal
#
###############################################################################
?FORMAT 2
###############################################################################
#ACTION SOURCE DEST PROTO DEST SOURCE ORIGIN RATE USER/
# PORT(S) PORT(S) DEST LIMIT GROUP
PARAM - - udp 500 # IKE
PARAM - - udp 4500 # NAT-T
PARAM - - 50 # ESP
PARAM DEST SOURCE udp 500 # IKE
PARAM DEST SOURCE udp 4500 # NAT-T
PARAM DEST SOURCE 50 # ESP
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