Add support for IPv6

The 40 bits in the ULA global prefix fdce:73a4:0b00::/48 were generated
by Python's `random.randint(0,2**40-1)` call

templates/bird.conf

@@ -11,7 +11,15 @@ protocol kernel {
 	};
 }
 
-protocol ospf v3 {
+protocol kernel {
+	ipv6 {
+		preference 100;
+		import none;
+		export all;
+	};
+}
+
+protocol ospf v2 {
 	ipv4 {
 		preference 10;
 		import all;
@@ -27,3 +35,19 @@ protocol ospf v3 {
 	};
 }
 
+protocol ospf v3 {
+	ipv6 {
+		preference 10;
+		import all;
+		export all;
+	};
+	area 0 {
+{% for br in c.bridges %}
+		interface "net_{{br.num}}" {
+			cost 10;
+			type broadcast;
+		};
+{% endfor %}
+	};
+}
+

templates/hosts

@@ -1,5 +1,6 @@
 {% for br in c.bridges %}
 172.23.{{ br.num }}.{{ c.num }}	host-{{ c.name }}-net-{{ br.num }}
+fdce:73a4:0b00:{{ "%x" % (br.num) }}::{{ "%x" % (c.num) }}	host-{{ c.name }}-net-{{ br.num }}-v6
 {% endfor %}
 127.0.0.1	host-{{ c.name }} localhost localhost.localdomain
 ::1	host-{{ c.name }} localhost localhost.localdomain

templates/interfaces

@@ -6,5 +6,7 @@ auto net_{{ br.num }}
 iface net_{{br.num}} inet static
 	pre-up nameif -s
 	address 172.23.{{ br.num }}.{{ c.num }}/24
+iface net_{{br.num}} inet6 static
+	address fdce:73a4:0b00:{{ "%x" % (br.num) }}::{{ "%x" % (c.num) }}/64
 
 {% endfor %}

templates/routing.conf

@@ -1 +1,2 @@
 net.ipv4.conf.all.forwarding=1
+net.ipv6.conf.all.forwarding=1