K 10
svn:author
V 2
cy
K 8
svn:date
V 27
2019-07-12T00:50:33.679883Z
K 7
svn:log
V 572
MFC r348987, r348989:

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

END