Add $ipv6_cpe_wanif to enable functionality required for IPv6 CPE

(r225485).  When setting an interface name to it, the following
configurations will be enabled:

 1. "no_radr" is set to all IPv6 interfaces automatically.

 2. "-no_radr accept_rtadv" will be set only for $ipv6_cpe_wanif.  This is
    done just before evaluating $ifconfig_IF_ipv6 in the rc.d scripts (this
    means you can manually supersede this configuration if necessary).

 3. The node will add RA-sending routers to the default router list
    even if net.inet6.ip6.forwarding=1.

This mode is added to conform to RFC 6204 (a router which connects
the end-user network to a service provider network).  To enable
packet forwarding, you still need to set ipv6_gateway_enable=YES.

Note that accepting router entries into the default router list when
packet forwarding capability and a routing daemon are enabled can
result in messing up the routing table.  To minimize such unexpected
behaviors, "no_radr" is set on all interfaces but $ipv6_cpe_wanif.

Approved by:	re (bz)

1 files changed, 3 insertions, 1 deletions

diff --git a/sys/netinet6/in6.h b/sys/netinet6/in6.h
index 5b552c9..1040d90 100644
--- a/sys/netinet6/in6.h
+++ b/sys/netinet6/in6.h
@@ -614,7 +614,9 @@ struct ip6_mtuinfo {
 #define	IPV6CTL_NO_RADR		48	/* No defroute from RA */
 #define	IPV6CTL_NORBIT_RAIF	49	/* Disable R-bit in NA on RA
 					 * receiving IF. */
-#define	IPV6CTL_MAXID		50
+#define	IPV6CTL_RFC6204W3	50	/* Accept defroute even when forwarding
+					   enabled */
+#define	IPV6CTL_MAXID		51
 #endif /* __BSD_VISIBLE */
 
 /*