[PATCHv3 21/24] IPVS: Add function to determine if IPv6 address is local

[Julius Volz <juliusv@xxxxxxxxxx>]

From: Vince Busam <vbusam@xxxxxxxxxx>

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

Signed-off-by: Vince Busam <vbusam@xxxxxxxxxx>

 1 files changed, 49 insertions(+), 7 deletions(-)

diff --git a/net/ipv4/ipvs/ip_vs_ctl.c b/net/ipv4/ipvs/ip_vs_ctl.c
index 25d9e98..640203a 100644
--- a/net/ipv4/ipvs/ip_vs_ctl.c
+++ b/net/ipv4/ipvs/ip_vs_ctl.c
@@ -35,6 +35,10 @@
 
 #include <net/net_namespace.h>
 #include <net/ip.h>
+#ifdef CONFIG_IP_VS_IPV6
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#endif
 #include <net/route.h>
 #include <net/sock.h>
 #include <net/genetlink.h>
@@ -91,6 +95,26 @@ 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} }, } },
+       };
+
+       rt = (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
+       if (rt && 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
@@ -751,10 +775,18 @@ __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.ip) == 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.in6)) {
+                       conn_flags = (conn_flags & ~IP_VS_CONN_F_FWD_MASK)
+                               | IP_VS_CONN_F_LOCALNODE;
+               }
+       } else
+#endif
+               if (inet_addr_type(&init_net, udest->addr.ip) == 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 */
        if ((conn_flags & IP_VS_CONN_F_FWD_MASK) != 0) {
@@ -803,9 +835,19 @@ ip_vs_new_dest(struct ip_vs_service *svc, struct 
ip_vs_dest_user_kern *udest,
 
        EnterFunction(2);
 
-       atype = inet_addr_type(&init_net, udest->addr.ip);
-       if (atype != RTN_LOCAL && atype != RTN_UNICAST)
-               return -EINVAL;
+#ifdef CONFIG_IP_VS_IPV6
+       if (svc->af == AF_INET6) {
+               atype = ipv6_addr_type(&udest->addr.in6);
+               if (!(atype & IPV6_ADDR_UNICAST) &&
+                       !__ip_vs_addr_is_local_v6(&udest->addr.in6))
+                       return -EINVAL;
+       } else
+#endif
+       {
+               atype = inet_addr_type(&init_net, udest->addr.ip);
+               if (atype != RTN_LOCAL && atype != RTN_UNICAST)
+                       return -EINVAL;
+       }
 
        dest = kzalloc(sizeof(struct ip_vs_dest), GFP_ATOMIC);
        if (dest == NULL) {
-- 
1.5.4.5

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