I believe Apple used FreeBSD's implementation of pf, as it also has the same syn...

Khaine on Sept 13, 2023 | parent | context | favorite | on: Bug in macOS 14 Sonoma prevents our app from worki...

I believe Apple used FreeBSD's implementation of pf, as it also has the same syntax. OpenBSD pf has evolved since then and their are minor syntactic differences for some rules between freebsd pf and openbsd pf.