FreeBSD -- IPv6 Routing Header 0 is dangerous

Problem Description
There is no mechanism for preventing IPv6 routing headers
from being used to route packets over the same link(s) many
times.
Impact
An attacker can “amplify” a denial of service attack against
a link between two vulnerable hosts; that is, by sending a
small volume of traffic the attacker can consume a much larger
amount of bandwidth between the two vulnerable hosts.
An attacker can use vulnerable hosts to “concentrate” a
denial of service attack against a victim host or network;
that is, a set of packets sent over a period of 30 seconds
or more could be constructed such that they all arrive at
the victim within a period of 1 second or less over a
period of 30 seconds or more could be constructed such that
they all arrive at the victim within a period of 1 second or
less.
Other attacks may also be possible.
Workaround
No workaround is available.