Never attempt to route the broadcast address.

diff --git a/src/net/ipv4.c b/src/net/ipv4.c
index e1219ed..35341b3 100644 (file)
--- a/src/net/ipv4.c
+++ b/src/net/ipv4.c
@@ -141,12 +141,20 @@ void del_ipv4_address ( struct net_device *netdev ) {
  * @v dest             Final destination address
  * @ret dest           Next hop destination address
  * @ret miniroute      Routing table entry to use, or NULL if no route
+ *
+ * If the route requires use of a gateway, the next hop destination
+ * address will be overwritten with the gateway address.
  */
 static struct ipv4_miniroute * ipv4_route ( struct in_addr *dest ) {
        struct ipv4_miniroute *miniroute;
        int local;
        int has_gw;
 
+       /* Never attempt to route the broadcast address */
+       if ( dest->s_addr == INADDR_BROADCAST )
+               return NULL;
+
+       /* Find first usable route in routing table */
        list_for_each_entry ( miniroute, &ipv4_miniroutes, list ) {
                local = ( ( ( dest->s_addr ^ miniroute->address.s_addr )
                            & miniroute->netmask.s_addr ) == 0 );