kern/47058: ip6flow_fastforward() is broken for non-aligned ip headers

[pooka%iki.fi@localhost]

>Number:         47058
>Category:       kern
>Synopsis:       ip6flow_fastforward() is broken for non-aligned ip headers
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Oct 11 19:30:00 +0000 2012
>Originator:     Antti Kantee
>Release:        
>Organization:
>Environment:
>Description:
In case of an unaligned IP6 header, ip6flow_fastforward() calls m_copyup() to 
get an aligned header.  It does not notify the caller of this, so if the mbuf 
is not processed by ip6flow_fastforward(), the caller will have lost a chunk of 
the mbuf chain.
>How-To-Repeat:

>Fix: