This file is indexed.

/etc/bash_completion.d/ifupdown is in bash-completion 1:1.3-1ubuntu8.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Red Hat & Debian GNU/Linux if{up,down} completion
#
[ $USERLAND = GNU ] && { have ifup || have ifdown; } &&
_ifupdown()
{
    local cur

    COMPREPLY=()
    _get_comp_words_by_ref cur

    if [ $COMP_CWORD -eq 1 ]; then
        _configured_interfaces
        COMPREPLY=( $(compgen -W '${COMPREPLY[@]}' -- "$cur") )
    fi

    return 0
} &&
complete -F _ifupdown ifup ifdown
[ $USERLAND = GNU ] && have ifstatus && complete -F _ifupdown ifstatus

# Local variables:
# mode: shell-script
# sh-basic-offset: 4
# sh-indent-comment: t
# indent-tabs-mode: nil
# End:
# ex: ts=4 sw=4 et filetype=sh