[IPV4]: Permit the official ARP hw type in SIOCSARP for FDDI.

Signed-off-by; Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/arp.c

@@ -1005,8 +1005,26 @@ int arp_req_set(struct arpreq *r, struct net_device * dev)
 		if (!dev)
 			return -EINVAL;
 	}
-	if (r->arp_ha.sa_family != dev->type)	
-		return -EINVAL;
+	switch (dev->type) {
+#ifdef CONFIG_FDDI
+	case ARPHRD_FDDI:
+		/*
+		 * According to RFC 1390, FDDI devices should accept ARP
+		 * hardware types of 1 (Ethernet).  However, to be more
+		 * robust, we'll accept hardware types of either 1 (Ethernet)
+		 * or 6 (IEEE 802.2).
+		 */
+		if (r->arp_ha.sa_family != ARPHRD_FDDI &&
+		    r->arp_ha.sa_family != ARPHRD_ETHER &&
+		    r->arp_ha.sa_family != ARPHRD_IEEE802)
+			return -EINVAL;
+		break;
+#endif
+	default:
+		if (r->arp_ha.sa_family != dev->type)
+			return -EINVAL;
+		break;
+	}
 
 	neigh = __neigh_lookup_errno(&arp_tbl, &ip, dev);
 	err = PTR_ERR(neigh);