/usr/src/openswan-2.6.38/packaging/utils/nattpatch is in openswan-modules-dkms 1:2.6.38-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 | #!/bin/sh
# wander through an OpenSWAN nat-t directory, creating a patch file (to stdout)
# that will apply the code to a kernel source directory.
#
# $Id: nattpatch,v 1.3 2005/09/26 02:37:58 mcr Exp $
#
KERN=$1
shift
. packaging/utils/kernelpatching.sh
patch20=false
patch22=false
patch24=false
patch26=false
case $KERN in
    2.0) patchname=os2_0; altname=fs2_0; patch20=true;;
    2.2) patchname=os2_2; altname=fs2_2; patch22=true;;
    2.4) patchname=os2_4; altname=fs2_4; patch24=true;;
    2.6) patchname=os2_6; altname=fs2_6; patch26=true;;
    *) echo "Invalid kernel patch target: $KERN"; exit 1;;
esac
# make sure that sort gets the right locale.
LANG=C export LANG
LC_ALL=C export LC_ALL
find nat-t -type f -print | grep -v CVS | egrep -v 'linux/Makefile' | sort | while read file 
do 
  base=`basename $file`
  pname=`echo $file | sed -e 's,\.fs._.$,,' -e 's,\.os._.$,,'`
  case $base in 
    TAGS) ;;
    tags) ;;
    .cvsignore) ;;
    .*.o.flags) ;;
    .\#*);;
    *.o) ;;
    *~) ;;
    tagsfile.mak) ;;
    *.$patchname.patch) cat $file;;
    *.$altname.patch) cat $file;;
    *.fs2_0) fakeallpatch $patch20 $file $pname ;;
    *.fs2_2) fakeallpatch $patch22 $file $pname ;;
    *.fs2_4) fakeallpatch $patch24 $file $pname ;;
    *.fs2_6) fakeallpatch $patch26 $file $pname ;;
    *.os2_0) fakeallpatch $patch20 $file $pname ;;
    *.os2_2) fakeallpatch $patch22 $file $pname ;;
    *.os2_4) fakeallpatch $patch24 $file $pname ;;
    *.os2_6) fakeallpatch $patch26 $file $pname ;;
    *.patch) ;;
    *) diff -u /dev/null $file;;
  esac
done
exit 0
	
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