K 10
svn:author
V 2
ae
K 8
svn:date
V 27
2018-02-05T09:22:07.143010Z
K 7
svn:log
V 598
Modify ip6_get_prevhdr() to be able use it safely.

Instead of returning pointer to the previous header, return its offset.
In frag6_input() use m_copyback() and determined offset to store next
header instead of accessing to it by pointer and assuming that the memory
is contiguous.

In rip6_input() use offset returned by ip6_get_prevhdr() instead of
calculating it from pointers arithmetic, because IP header can belong
to another mbuf in the chain.

Reported by:	Maxime Villard <max at m00nbsd dot net>
Reviewed by:	kp
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D14158

END