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 4a2ee35..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);
+                       }
                }
        }