Instruction on how to use the classifier is all documented in the
header files of the code itself. Look at

	/afs/cs.cmu.edu/project/cmcl-darwin/netbsd/pkt_classifier/*.h

for detail.

In a nutshell, you can add a class, then you can modify the class,
move the class, or delete the class. Here is an example on how to make
the ioctl call.


#include <sockio.h>
#include <tc_classifier.h>

  int sockfd;
  create_class_t newClass;

  if ((sockfd = socket (AF_INET, SOCK_STREAM, 0)) < 0)
    {
      printf ("Cannot open socket\n");
      exit (1);
    }

  bzero(&newClass, sizeof(create_class_t));

  strcpy(newClass.ifName, hInfo.ifName);
  newClass.link_option = BY_FILTER;
  newClass.resvProt = GUI;
  newClass.filt_info.fSrcAddr = ntohl(inet_addr(argv[1]));
  newClass.filt_info.fSrcMask = ntohl(inet_addr(argv[2]));
  newClass.filt_info.fSrcMskd = 
	newClass.filt_info.fSrcAddr & newClass.filt_info.fSrcMask;
  newClass.filt_info.fDstAddr = ntohl(inet_addr(argv[3]));
  newClass.filt_info.fDstMask = ntohl(inet_addr(argv[4]));
  newClass.filt_info.fDstMskd = 
	newClass.filt_info.fDstAddr & newClass.filt_info.fDstMask;
  newClass.filt_info.fProto   = atoi(argv[5]);
  newClass.filt_info.fSrcPort = (short)atoi(argv[6]);
  newClass.filt_info.fDstPort = (short)atoi(argv[7]);
  newClass.service_curve.m1        = atoi(argv[8]);
  newClass.service_curve.d         = atoi(argv[9]);
  newClass.service_curve.m2        = atoi(argv[10]);

  ioctl(sockfd, CLASSIFIER_CREATE_CLASS, &newClass);

  if ( newClass.classID == 0 ) {
    sprintf(interp->result,"error");
  }