classifier-mcast.h

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/* -*-  Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */

/*
 * Copyright (C) 1999 by the University of Southern California
 * $Id: classifier-mcast.h,v 1.7 2005/08/25 18:58:01 johnh Exp $
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 *
 *
 * The copyright of this module includes the following
 * linking-with-specific-other-licenses addition:
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 * this module give you permission to combine (via static or
 * dynamic linking) this module with free software programs or
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#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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