How to auto generate 'rel_canonical' tags in Wordpress

I have a site like follow

Major : xyz.com
Mirror(duplicate) : eu.xyz.com

I need to add 'rel_canonical' tags in mirror point back to major site for Google crawling, right ?

How I can auto generate tags for each page on mirror site point to original ?

Please help, thanks

hey, did u see "Canonical SEO Content Syndication" plugin ?