2d3fda5fa1
It turns out pf incorrectly updates the TCP checksum if the TCP option we're modifying is not 2-byte algined with respect to the start of the packet. Create a TCP packet with such an option and throw it through a scrub rule, which will update timestamps and modify the packet. PR: 240416 MFC after: 1 week Differential revision: https://reviews.freebsd.org/D27688