MFC r349927, r349929:
r349927:
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.
Plus whitespace adjustments (r348989).
PR: 203275, 203585
Differential Revision: https://reviews.freebsd.org/D20583
r349929:
Move the new ipf_pcksum6() function from ip_fil_freebsd.c to fil.c.
The reason for this is that ipftest(8), which still works on FreeBSD-11,
fails to link to it, breaking stable/11 builds.
ipftest(8) was broken (segfault) sometime during the FreeBSD-12 cycle.
glebius@ suggested we disable building it until I can get around to
fixing it. Hence this was not caught in -current.
The intention is to fix ipftest(8) as it is used by the netbsd-tests
(imported by ngie@ many moons ago) for regression testing.
git-svn-id: svn://svn.freebsd.org/base/stable/10@349931
ccf9f872-aa2e-dd11-9fc8-
001c23d0bc1f