Add a configuration options which enable/disable IPv4 mapped IPv6 addr

support.

Suggested and Reviewed by: ume

3 files changed, 24 insertions, 0 deletions

diff --git a/etc/defaults/rc.conf b/etc/defaults/rc.conf
index d84bd1e..3638add 100644
--- a/etc/defaults/rc.conf
+++ b/etc/defaults/rc.conf
@@ -232,6 +232,8 @@ stf_interface_ipv4plen="0"	# Prefix length for 6to4 IPv4 addr,
 stf_interface_ipv6_ifid="0:0:0:1"	# IPv6 interface id for stf0.
 				# If you like, you can set "AUTO" for this.
 stf_interface_ipv6_slaid="0000"	# IPv6 Site Level Aggregator for stf0
+ipv6_ipv4mapping="YES";		# Set to brank to disable IPv4 mapped IPv6 addr
+				# communication. (like ::ffff:a.b.c.d)
 
 ##############################################################
 ###  System console options  #################################
diff --git a/etc/rc.d/network_ipv6 b/etc/rc.d/network_ipv6
index 801077f..d4c5dd2 100644
--- a/etc/rc.d/network_ipv6
+++ b/etc/rc.d/network_ipv6
@@ -212,6 +212,17 @@ network6_pass1() {
 		;;
 	esac
 
+	case ${ipv6_ipv4mapping} in
+	[Yy][Ee][Ss])
+		echo -n ' IPv4 mapped IPv6 address support=YES'
+		sysctl -w net.inet6.ip6.mapped_addr=1 >/dev/null
+		;;
+	'' | *)
+		echo -n ' IPv4 mapped IPv6 address support=NO'
+		sysctl -w net.inet6.ip6.mapped_addr=0 >/dev/null
+		;;
+	esac
+
 	echo '.'
 
 	# Let future generations know we made it.
diff --git a/etc/rc.network6 b/etc/rc.network6
index 801077f..d4c5dd2 100644
--- a/etc/rc.network6
+++ b/etc/rc.network6
@@ -212,6 +212,17 @@ network6_pass1() {
 		;;
 	esac
 
+	case ${ipv6_ipv4mapping} in
+	[Yy][Ee][Ss])
+		echo -n ' IPv4 mapped IPv6 address support=YES'
+		sysctl -w net.inet6.ip6.mapped_addr=1 >/dev/null
+		;;
+	'' | *)
+		echo -n ' IPv4 mapped IPv6 address support=NO'
+		sysctl -w net.inet6.ip6.mapped_addr=0 >/dev/null
+		;;
+	esac
+
 	echo '.'
 
 	# Let future generations know we made it.