kern/40388: IPv6 incompatibility with pre-5.99.6 binary

[nakayama%netbsd.org@localhost]

>Number:         40388
>Category:       kern
>Synopsis:       IPv6 incompatibility with pre-5.99.6 binary
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jan 13 14:20:04 +0000 2009
>Originator:     Takeshi Nakayama
>Release:        NetBSD 5.99.7 20090113
>Organization:
        Private
>Environment:
System: NetBSD eos 5.99.7 NetBSD 5.99.7 (GENERIC.MP) #7: Tue Jan 13 05:42:59 
JST 2009 takeshi@nyx:/export/netbsd-cvs/src/sys/arch/sparc64/compile/GENERIC.MP 
sparc64
Architecture: sparc64
Machine: sparc64
>Description:
        Pre-5.99.6 ifconfig binary cannot configure IPv6 network address.

>How-To-Repeat:
        eos# ifconfig hme0 inet6 eos alias
        ifconfig: SIOCAIFADDR_IN6: Inappropriate ioctl for device

>Fix:
        Some structures in netinet6/in6_var.h use time_t. So it
        seems we need to provide compat ioctls.