classifier-mcast.h

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/* -*-  Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
 * classifier-mcast.h
 *
 * Copyright (C) 1999 by USC/ISI
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation, advertising
 * materials, and other materials related to such distribution and use
 * acknowledge that the software was developed by the University of
 * Southern California, Information Sciences Institute.  The name of the
 * University may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 * 
 */

#ifndef ns_classifier_mcast_h
#define ns_classifier_mcast_h

#include <stdlib.h>
#include "config.h"
#include "packet.h"
#include "ip.h"
#include "classifier.h"

class MCastClassifier : public Classifier {
public:
        MCastClassifier();
        ~MCastClassifier();
        static const char STARSYM[]; //"source" field for shared trees
protected:
        virtual int command(int argc, const char*const* argv);
        virtual int classify(Packet *p);
        int findslot();
        enum {HASHSIZE = 256};
        struct hashnode {
                int slot;
                nsaddr_t src;
                nsaddr_t dst;
                hashnode* next;
                int iif; // for RPF checking
        };
        int hash(nsaddr_t src, nsaddr_t dst) const {
                u_int32_t s = src ^ dst;
                s ^= s >> 16;
                s ^= s >> 8;
                return (s & 0xff);
        }
        hashnode* ht_[HASHSIZE];
        hashnode* ht_star_[HASHSIZE]; // for search by group only (not <s,g>)

        void set_hash(hashnode* ht[], nsaddr_t src, nsaddr_t dst,
                      int slot, int iface);
        void clearAll();
        void clearHash(hashnode* h[], int size);
        hashnode* lookup(nsaddr_t src, nsaddr_t dst,
                         int iface = iface_literal::ANY_IFACE) const;
        hashnode* lookup_star(nsaddr_t dst,
                              int iface = iface_literal::ANY_IFACE) const;
        void change_iface(nsaddr_t src, nsaddr_t dst,
                          int oldiface, int newiface);
        void change_iface(nsaddr_t dst,
                          int oldiface, int newiface);
};
#endif

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