Loopback interfaces have routes scoped to the host only.

diff --git a/if-linux.c b/if-linux.c
index 80f632f6fd560867f6e5b6b0d969851d58c1a29c..e65e91f74e4e743e0ce1cb68642189de6fcb1058 100644 (file)
--- a/if-linux.c
+++ b/if-linux.c
@@ -1281,7 +1281,9 @@ if_route(const struct rt *rt, int action)
                        nlm.rt.rtm_protocol = RTPROT_KERNEL;
                else
                        nlm.rt.rtm_protocol = RTPROT_BOOT;
-               if (rt->gate.s_addr == INADDR_ANY ||
+               if (rt->iface->flags & IFF_LOOPBACK)
+                       nlm.rt.rtm_scope = RT_SCOPE_HOST;
+               else if (rt->gate.s_addr == INADDR_ANY ||
                    (rt->gate.s_addr == rt->dest.s_addr &&
                        rt->net.s_addr == INADDR_BROADCAST))
                        nlm.rt.rtm_scope = RT_SCOPE_LINK;
@@ -1409,7 +1411,9 @@ if_route6(const struct rt6 *rt, int action)
        else {
                nlm.hdr.nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
                /* None interface subnet routes are static. */
-               if (IN6_IS_ADDR_UNSPECIFIED(&rt->gate)) {
+               if (rt->iface->flags & IFF_LOOPBACK)
+                       nlm.rt.rtm_scope = RT_SCOPE_HOST;
+               else if (IN6_IS_ADDR_UNSPECIFIED(&rt->gate)) {
                        nlm.rt.rtm_protocol = RTPROT_KERNEL;
                        nlm.rt.rtm_scope = RT_SCOPE_LINK;
                } else