Fiqh-us-Sunnah Volume 5, Hajj and ‘Umrah, Fiqh 5.130.

The author of Fath ul ‘Alam says: ‘The scholars disagree concerning the place of slaughter on the Day of Hudaibiah whether it was within or outside the Sacred Precincts of Haram. Apparently the words of Allah “and they hindered you from the Sacred Mosque and sacrificial animals” suggest that the animals were slaughtered outside the Sacred Precincts of Haram. There are various views concerning this. One view – the majority view – is that a prevented person may slaughter his sacrificial animal within or outside the Sacred Precincts of Haram. Another view, the view of the Hanafi School is that he must slaughter it within the Sacred Precincts of Haram. A third view, the view of Ibn ‘Abbas and a group of scholars, is that if a prevented person is in a position to send his sacrificial animal to the Precincts of Haram he must slaughter it there, and only then terminate his ihram. If this is not possible then he may slaughter it at the place where he is prevented.