/usr/share/man/man3/ipsec_masktobits.3.gz is in openswan 1:2.6.37-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/ipsec_goodmask.3.gz
/usr/share/man/man3/ipsec_goodmask.3.gz