IPVS: Activate IPv6 Netfilter hooks

Register the previously defined or adapted netfilter hook functions for
IPv6 as PF_INET6 hooks.
Signed-off-by: Julius Volz <juliusv@google.com>
Signed-off-by: Simon Horman <horms@verge.net.au>

net/ipv4/ipvs/ip_vs_core.c

@@ -1413,6 +1413,43 @@ static struct nf_hook_ops ip_vs_ops[] __read_mostly = {
 		.hooknum        = NF_INET_POST_ROUTING,
 		.priority       = NF_IP_PRI_NAT_SRC-1,
 	},
+#ifdef CONFIG_IP_VS_IPV6
+	/* After packet filtering, forward packet through VS/DR, VS/TUN,
+	 * or VS/NAT(change destination), so that filtering rules can be
+	 * applied to IPVS. */
+	{
+		.hook		= ip_vs_in,
+		.owner		= THIS_MODULE,
+		.pf		= PF_INET6,
+		.hooknum        = NF_INET_LOCAL_IN,
+		.priority       = 100,
+	},
+	/* After packet filtering, change source only for VS/NAT */
+	{
+		.hook		= ip_vs_out,
+		.owner		= THIS_MODULE,
+		.pf		= PF_INET6,
+		.hooknum        = NF_INET_FORWARD,
+		.priority       = 100,
+	},
+	/* After packet filtering (but before ip_vs_out_icmp), catch icmp
+	 * destined for 0.0.0.0/0, which is for incoming IPVS connections */
+	{
+		.hook		= ip_vs_forward_icmp_v6,
+		.owner		= THIS_MODULE,
+		.pf		= PF_INET6,
+		.hooknum        = NF_INET_FORWARD,
+		.priority       = 99,
+	},
+	/* Before the netfilter connection tracking, exit from POST_ROUTING */
+	{
+		.hook		= ip_vs_post_routing,
+		.owner		= THIS_MODULE,
+		.pf		= PF_INET6,
+		.hooknum        = NF_INET_POST_ROUTING,
+		.priority       = NF_IP6_PRI_NAT_SRC-1,
+	},
+#endif
 };