fixed bug #35531: Impossible to send multicast without a gateway (introduced when fixing bug# 33551)

CHANGELOG

@@ -76,6 +76,10 @@ HISTORY
 
  ++ Bugfixes:
 
+  2012-02-16: Simon Goldschmidt
+  * etharp.c: fixed bug #35531: Impossible to send multicast without a gateway
+    (introduced when fixing bug# 33551)
+
   2012-02-16: Simon Goldschmidt (patch by Stéphane Lesage)
   * msg_in.c, msg_out.c: fixed bug #35536 SNMP: error too big response is malformed
 

src/netif/etharp.c

@@ -899,7 +899,7 @@ etharp_output(struct netif *netif, struct pbuf *q, ip_addr_t *ipaddr)
   /* outside local network? if so, this can neither be a global broadcast nor
      a subnet broadcast. */
   if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask)) &&
-      !ip_addr_islinklocal(ipaddr)) {
+      !ip_addr_islinklocal(ipaddr) && !ip_addr_ismulticast(ipaddr)) {
 #if LWIP_AUTOIP
     struct ip_hdr *iphdr = (struct ip_hdr*)((u8_t*)q->payload +
       sizeof(struct eth_hdr));