interface-ip: Fix broadcast address when using /31 or /32 IPv4 addressing

[project/netifd.git] / interface-ip.c

diff --git a/interface-ip.c b/interface-ip.c
index 8eb2ff3..54f56d6 100644 (file)
--- a/interface-ip.c
+++ b/interface-ip.c
@@ -473,11 +473,17 @@ interface_update_proto_addr(struct vlist_tree *tree,
                if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
                    !a_new->broadcast) {
 
-                       uint32_t mask = ~0;
-                       uint32_t *a = (uint32_t *) &a_new->addr;
-
-                       mask >>= a_new->mask;
-                       a_new->broadcast = *a | htonl(mask);
+                       /* /31 and /32 addressing need 255.255.255.255
+                        * as broadcast address. */
+                       if (a_new->mask >= 31) {
+                               a_new->broadcast = (uint32_t) ~0;
+                       } else {
+                               uint32_t mask = ~0;
+                               uint32_t *a = (uint32_t *) &a_new->addr;
+
+                               mask >>= a_new->mask;
+                               a_new->broadcast = *a | htonl(mask);
+                       }
                }
        }
 
@@ -591,7 +597,7 @@ interface_update_proto_route(struct vlist_tree *tree,
        if (node_old && node_new)
                keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
                        (route_old->mtu == route_new->mtu) && (route_old->type == route_new->type) &&
-                       (route_old->valid_until == route_new->valid_until) && !route_old->failed;
+                       !route_old->failed;
 
        if (node_old) {
                if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)