[Bug 203585] update 235959 and 235961 breaks ipv6 layer 4 checksums in ipf

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203585

--- Comment #3 from commit-hook at freebsd.org ---
A commit references this bug:

Author: cy
Date: Wed Jun 12 11:06:59 UTC 2019
New revision: 348987
URL: https://svnweb.freebsd.org/changeset/base/348987

Log:
  Resolve IPv6 checksum errors with stateful inspection. According to
  PR/203585 this appears to have been broken by r235959, which predates
  the ipfilter 5.1.2 import into FreeBSD.

  The IPv6 checksum calculation is incorrect. To resolve this we call
  in6_cksum() to do the the heavy lifting for us, through a new function
  ipf_pcksum6(). Should we need to revisit this area again, a DTrace probe
  is added to aid with future debugging.

  PR:           203275, 203585
  MFC after:    1 month
  Differential Revision:        https://reviews.freebsd.org/D20583

Changes:
  head/sys/contrib/ipfilter/netinet/fil.c
  head/sys/contrib/ipfilter/netinet/ip_fil.h
  head/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c

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