[ethernet] Add support for generating multicast hash for IPv6 addresses

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/net/ethernet.c

@@ -149,6 +149,11 @@ int eth_mc_hash ( unsigned int af, const void *net_addr, void *ll_addr ) {
 		ll_addr_bytes[4] = net_addr_bytes[2];
 		ll_addr_bytes[5] = net_addr_bytes[3];
 		return 0;
+	case AF_INET6:
+		ll_addr_bytes[0] = 0x33;
+		ll_addr_bytes[1] = 0x33;
+		memcpy ( &ll_addr_bytes[2], &net_addr_bytes[12], 4 );
+		return 0;
 	default:
 		return -ENOTSUP;
 	}