scope cleanup. with this change

- most of the kernel code will not care about the actual encoding of
  scope zone IDs and won't touch "s6_addr16[1]" directly.
- similarly, most of the kernel code will not care about link-local
  scoped addresses as a special case.
- scope boundary check will be stricter.  For example, the current
  *BSD code allows a packet with src=::1 and dst=(some global IPv6
  address) to be sent outside of the node, if the application do:
    s = socket(AF_INET6);
    bind(s, "::1");
    sendto(s, some_global_IPv6_addr);
  This is clearly wrong, since ::1 is only meaningful within a single
  node, but the current implementation of the *BSD kernel cannot
  reject this attempt.

Submitted by:	JINMEI Tatuya <jinmei__at__isl.rdc.toshiba.co.jp>
Obtained from:	KAME

1 files changed, 1 insertions, 0 deletions

diff --git a/sys/netinet6/in6.h b/sys/netinet6/in6.h
index d0ebdae..05d0943 100644
--- a/sys/netinet6/in6.h
+++ b/sys/netinet6/in6.h
@@ -590,6 +590,7 @@ struct ip6_mtuinfo {
 #define IPV6CTL_RIP6STATS	36	/* raw_ip6 stats */
 #define IPV6CTL_PREFER_TEMPADDR	37	/* prefer temporary addr as src */
 #define IPV6CTL_ADDRCTLPOLICY	38	/* get/set address selection policy */
+#define IPV6CTL_USE_DEFAULTZONE	39	/* use default scope zone */
 
 #define IPV6CTL_MAXFRAGS	41	/* max fragments */