[PATCH 22/26] IPVS: Add function to find out if IPv6 address is local.

["Julius R. Volz" <juliusv@google.com>]

From: Vince Busam <vbusam@google.com>

Add __ip_vs_addr_is_local_v6() to find out if an IPv6 address belongs to a
local interface. This function is used to decide whether to set the
IP_VS_CONN_F_LOCALNODE flag for IPv6 destinations.

Signed-off-by: Vince Busam <vbusam@google.com>

 1 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index da2e431..cf52034 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -92,6 +92,23 @@ int ip_vs_get_debug_level(void)
 }
 #endif
 
+#ifdef CONFIG_IP_VS_IPV6
+/* Taken from rt6_fill_node() in net/ipv6/route.c, is there a better way? */
+static int __ip_vs_addr_is_local_v6(const struct in6_addr *addr) {
+	struct rt6_info *rt;
+	struct flowi fl = {
+		.oif = 0,
+		.nl_u = {
+			.ip6_u = {
+				.daddr = *addr,
+				.saddr = { .s6_addr32 = {0, 0, 0, 0} }, } },
+	};
+	if ((rt = (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl)))
+		if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK))
+			return 1;
+	return 0;
+}
+#endif
 /*
  *	update_defense_level is called from keventd and from sysctl,
  *	so it needs to protect itself from softirqs
@@ -708,9 +725,19 @@ __ip_vs_update_dest(struct ip_vs_service *svc,
 	conn_flags = udest->conn_flags | IP_VS_CONN_F_INACTIVE;
 
 	/* check if local node and update the flags */
-	if (inet_addr_type(&init_net, udest->addr) == RTN_LOCAL) {
-		conn_flags = (conn_flags & ~IP_VS_CONN_F_FWD_MASK)
-			| IP_VS_CONN_F_LOCALNODE;
+#ifdef CONFIG_IP_VS_IPV6
+	if (svc->af == AF_INET6) {
+		if (__ip_vs_addr_is_local_v6(&udest->addr.v6)) {
+			conn_flags = (conn_flags & ~IP_VS_CONN_F_FWD_MASK)
+				| IP_VS_CONN_F_LOCALNODE;
+		}
+	}
+#endif
+	if (svc->af == AF_INET) {
+		if (inet_addr_type(&init_net, udest->addr.v4) == RTN_LOCAL) {
+			conn_flags = (conn_flags & ~IP_VS_CONN_F_FWD_MASK)
+				| IP_VS_CONN_F_LOCALNODE;
+		}
 	}
 
 	/* set the IP_VS_CONN_F_NOOUTPUT flag if not masquerading/NAT */
-- 
1.5.3.6