// -*- c-basic-offset: 4; tab-width: 8; indent-tabs-mode: t -*-
// Copyright (c) 2001,2002 International Computer Science Institute
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software")
// to deal in the Software without restriction, subject to the conditions
// listed in the XORP LICENSE file. These conditions include: you must
// preserve this copyright notice, and you cannot mention the copyright
// holders in advertising related to the Software without their permission.
// The Software is provided WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED. This
// notice is a summary of the XORP LICENSE file; the license in that file is
// legally binding.
// $XORP: xorp/mrt/mrt.hh,v 1.1.1.1 2002/12/11 23:56:07 hodson Exp $
#ifndef __MRT_MRT_HH__
#define __MRT_MRT_HH__
//
// Multicast Routing Table implementation.
//
#include <map>
#include "libxorp/xorp.h"
#include "libxorp/ipvx.hh"
#include "libxorp/ipvxnet.hh"
//
// Constants definitions
//
//
// Structures/classes, typedefs and macros
//
/**
* @short Class to store (S,G) (Source, Group) pair of addresses.
*/
class SourceGroup {
public:
/**
* Constructor for a source and a group address.
*
* @param source_addr the source address.
* @param group_addr the group address.
*/
SourceGroup(const IPvX& source_addr, const IPvX& group_addr)
: _source_addr(source_addr), _group_addr(group_addr) {}
/**
* Get the source address.
*
* @return the source address.
*/
const IPvX& source_addr() const { return (_source_addr); }
/**
* Get the group address.
*
* @return the group address.
*/
const IPvX& group_addr() const { return (_group_addr); }
private:
IPvX _source_addr; // The source address
IPvX _group_addr; // The group address
};
/**
* @short Class for (S,G) lookup key (Source-first, Group-second priority).
*/
class MreSgKey {
public:
/**
* Constructor for a given @ref SourceGroup entry.
*
* @param source_group a reference to the corresponding (S,G) entry.
*/
MreSgKey(const SourceGroup& source_group) : _source_group(source_group) {}
/**
* Get the corresponding @ref SourceGroup entry.
*
* @return a reference to the corresponding (S,G) entry.
*/
const SourceGroup& source_group() const { return (_source_group); }
/**
* Less-Than Operator
*
* @param other the right-hand operand to compare against.
*
* @return true if the left-hand operand is numerically smaller than the
* right-hand operand.
*/
bool operator<(const MreSgKey& other) const {
if (_source_group.source_addr() == other.source_group().source_addr())
return (_source_group.group_addr()
< other.source_group().group_addr());
return (_source_group.source_addr()
< other.source_group().source_addr());
}
/**
* Equality Operator
*
* @param other the right-hand operand to compare against.
* @return true if the left-hand operand is numerically same as the
* right-hand operand.
*/
bool operator==(const MreSgKey& other) const {
return ((_source_group.source_addr()
== other.source_group().source_addr())
&& (_source_group.group_addr()
== other.source_group().group_addr()));
}
private:
const SourceGroup& _source_group; // A reference to the corresponding
// (S,G) used for comparison.
};
/**
* @short Class for (S,G) lookup key (Group-first, Source-second priority).
*/
class MreGsKey {
public:
/**
* Constructor for a given @ref SourceGroup entry.
*
* @param source_group a reference to the corresponding (S,G) entry.
*/
MreGsKey(const SourceGroup& source_group) : _source_group(source_group) {}
/**
* Get the corresponding @ref SourceGroup entry.
*
* @return a reference to the corresponding (S,G) entry.
*/
const SourceGroup& source_group() const { return (_source_group); }
/**
* Less-Than Operator
*
* @param other the right-hand operand to compare against.
*
* @return true if the left-hand operand is numerically smaller than the
* right-hand operand.
*/
bool operator<(const MreGsKey& other) const {
if (_source_group.group_addr() == other.source_group().group_addr())
return (_source_group.source_addr()
< other.source_group().source_addr());
return (_source_group.group_addr()
< other.source_group().group_addr());
}
/**
* Equality Operator
*
* @param other the right-hand operand to compare against.
* @return true if the left-hand operand is numerically same as the
* right-hand operand.
*/
bool operator==(const MreGsKey& other) const {
return ((_source_group.source_addr()
== other.source_group().source_addr())
&& (_source_group.group_addr()
== other.source_group().group_addr()) );
}
private:
const SourceGroup& _source_group; // A reference to the corresponding
// (S,G) used for comparison.
};
/**
* @short Template class for Multicast Routing Table.
*/
template <class E>
class Mrt {
public:
/**
* Default constructor
*/
Mrt() {}
/**
* Destructor
*/
virtual ~Mrt() { clear(); }
//
// Typedefs for lookup maps and iterators.
//
typedef map<MreSgKey, E*> SgMap;
typedef map<MreGsKey, E*> GsMap;
typedef SgMap::iterator sg_iterator;
typedef GsMap::iterator gs_iterator;
typedef SgMap::const_iterator const_sg_iterator;
typedef GsMap::const_iterator const_gs_iterator;
/**
* Remove all multicast routing entries from the table.
*
* Note that the entries themselves are also deleted.
*/
void clear() {
// Remove all multicast routing entries.
for (sg_iterator iter = _sg_table.begin(); iter != _sg_table.end(); ) {
E *mre = iter->second;
++iter;
delete mre;
}
// Clear the (S,G) and (G,S) lookup tables
_sg_table.clear();
_gs_table.clear();
}
/**
* Insert a multicast routing entry that was already created.
*
* Note that we insert a pointer to the @ref mre, hence @ref mre
* should not be deleted without removing it first from the table.
*
* @param mre the multicast routing entry to insert.
* @return the multicast routing entry that was inserted on success,
* otherwise NULL.
*/
E *insert(E *mre) {
pair<sg_iterator, bool> sg_pos
= _sg_table.insert(
pair<MreSgKey, E*>(MreSgKey(mre->source_group()), mre));
if (! sg_pos.second)
return (NULL);
pair<gs_iterator, bool> gs_pos
= _gs_table.insert(
pair<MreGsKey, E*>(MreGsKey(mre->source_group()), mre));
if (! gs_pos.second) {
_sg_table.erase(sg_pos.first);
return (NULL);
}
mre->_sg_key = sg_pos.first;
mre->_gs_key = gs_pos.first;
return (mre);
}
/**
* Remove a multicast routing entry from the table.
*
* Note that the entry itself is not deleted.
*
* @param mre the multicast routing entry to delete from the table.
* @return XORP_OK if the entry was in the table and was successfully
* removed, otherwise XORP_ERROR.
*/
int remove(E *mre) {
int ret_value = XORP_ERROR;
if (mre->_sg_key != _sg_table.end()) {
_sg_table.erase(mre->_sg_key);
mre->_sg_key = _sg_table.end();
ret_value = XORP_OK;
}
if (mre->_gs_key != _gs_table.end()) {
_gs_table.erase(mre->_gs_key);
mre->_gs_key = _gs_table.end();
ret_value = XORP_OK;
}
return (ret_value);
}
/**
* Find a multicast routing entry from the table.
*
* @param source_addr the source address to search for.
* @param group_addr the group address to search for.
* @return the multicast routing entry for source @ref source_addr
* and group @ref group_addr if found, otherwise NULL.
*/
E *find(const IPvX& source_addr, const IPvX& group_addr) const {
const_sg_iterator pos = _sg_table.find(
MreSgKey(SourceGroup(source_addr, group_addr)));
if (pos != _sg_table.end())
return (pos->second);
return (NULL);
}
/**
* Find the first multicast routing entry for a source address.
*
* @param source_addr the source address to search for.
* @return the first multicast routing entry for source @ref source_addr
* if found, otherwise NULL.
*/
E *find_source(const IPvX& source_addr) const {
const_sg_iterator pos
= _sg_table.lower_bound(
MreSgKey(SourceGroup(source_addr,
IPvX::ZERO(source_addr.af()) ) ) );
if (pos != _sg_table.end()) {
if (pos->second->source_addr() == source_addr)
return (pos->second);
}
return (NULL);
}
/**
* Find the first multicast routing entry for a group address.
*
* @param group_addr the group address to search for.
* @return the first multicast routing entry for group @ref group_addr
* if found, otherwise NULL.
*/
E *find_group(const IPvX& group_addr) const {
const_gs_iterator pos
= _gs_table.lower_bound(
MreGsKey(SourceGroup(IPvX::ZERO(group_addr.af()),
group_addr)));
if (pos != _gs_table.end()) {
if (pos->second->group_addr() == group_addr)
return (pos->second);
}
return (NULL);
}
/**
* Find the first multicast routing entry for a source address prefix.
*
* @param prefix_s the source address prefix to search for.
* @return the first multicast routing entry for source address
* prefix @ref prefix_s if found, otherwise NULL.
*/
E *find_source_by_prefix(const IPvXNet& prefix_s) const {
const_sg_iterator pos
= _sg_table.lower_bound(
MreSgKey(SourceGroup(prefix_s.masked_addr(),
IPvX::ZERO(prefix_s.af()) ) ) );
if (pos == _sg_table.end())
return (NULL);
E *mre = pos->second;
if (mre->is_same_prefix_s(prefix_s))
return (mre);
return (NULL);
}
/**
* Find the first multicast routing entry for a group address prefix.
*
* @param prefix_g the group address prefix to search for.
* @return the first multicast routing entry for group address
* prefix @ref prefix_g if found, otherwise NULL.
*/
E *find_group_by_prefix(const IPvXNet& prefix_g) const {
const_gs_iterator pos
= _gs_table.lower_bound(
MreGsKey(SourceGroup(prefix_g.masked_addr(),
IPvX::ZERO(prefix_g.af()) ) ) );
if (pos == _gs_table.end())
return (NULL);
E *mre = pos->second;
if (mre->is_same_prefix_g(prefix_g))
return (mre);
return (NULL);
}
/**
* Get the number of multicast routing entries in the table.
*
* @return the number of multicast routing entries.
*/
size_t size() const { return (_sg_table.size()); }
/**
* Get an iterator for the first element in the source-group table.
*
* @return the iterator for the first element in the source-group table.
*/
const_sg_iterator sg_begin() const { return (_sg_table.begin()); }
/**
* Get an iterator for the first element in the group-source table.
*
* @return the iterator for the first element in the group-source table.
*/
const_gs_iterator gs_begin() const { return (_gs_table.begin()); }
/**
* Get an iterator for the last element in the source-group table.
*
* @return the iterator for the last element in the source-group table.
*/
const_sg_iterator sg_end() const { return (_sg_table.end()); }
/**
* Get an iterator for the last element in the group-source table.
*
* @return the iterator for the last element in the group-source table.
*/
const_gs_iterator gs_end() const { return (_gs_table.end()); }
/**
* Find the source iterator for the first multicast routing entry
* for a source address prefix.
*
* @param prefix_s the source address prefix to search for.
* @return the iterator for first entry with source address that
* matches @ref prefix_s. If no matching entry is found, the
* return value is @ref source_by_prefix_end().
*/
const_sg_iterator source_by_prefix_begin(const IPvXNet& prefix_s) const {
const_sg_iterator pos
= _sg_table.lower_bound(
MreSgKey(SourceGroup(prefix_s.masked_addr(),
IPvX::ZERO(prefix_s.af()) ) ) );
return (pos);
}
/**
* Find the source iterator for the one-after-the-last multicast routing
* entry for a source address prefix.
*
* @param prefix_s the source address prefix to search for.
* @return the iterator for one-after-the-last entry with source address
* that matches @ref prefix_s. If no such entry exists, the
* return value is @ref sg_end().
*/
const_sg_iterator source_by_prefix_end(const IPvXNet& prefix_s) const {
if (prefix_s.prefix_len() == 0)
return (_sg_table.end()); // XXX: special case
IPvXNet next_prefix_s(prefix_s);
++next_prefix_s;
const_sg_iterator pos
= _sg_table.lower_bound(
MreSgKey(SourceGroup(next_prefix_s.masked_addr(),
IPvX::ZERO(next_prefix_s.af()) ) ) );
return (pos);
}
/**
* Find the group iterator for the first multicast routing entry
* for a group address prefix.
*
* @param prefix_g the group address prefix to search for.
* @return the iterator for first entry with group address that
* matches @ref prefix_g. If no matching entry is found, the
* return value is @ref group_by_prefix_end().
*/
const_gs_iterator group_by_prefix_begin(const IPvXNet& prefix_g) const {
const_gs_iterator pos
= _gs_table.lower_bound(
MreGsKey(SourceGroup(IPvX::ZERO(prefix_g.af()),
prefix_g.masked_addr() ) ) );
return (pos);
}
/**
* Find the group iterator for the one-after-the-last multicast routing
* entry for a group address prefix.
*
* @param prefix_g the group address prefix to search for.
* @return the iterator for one-after-the-last entry with group address
* that matches @ref prefix_g. If no such entry exists, the
* return value is @ref gs_end().
*/
const_gs_iterator group_by_prefix_end(const IPvXNet& prefix_g) const {
if (prefix_g.prefix_len() == 0)
return (_gs_table.end()); // XXX: special case
IPvXNet next_prefix_g(prefix_g);
++next_prefix_g;
const_gs_iterator pos
= _gs_table.lower_bound(
MreGsKey(SourceGroup(IPvX::ZERO(next_prefix_g.af()),
next_prefix_g.masked_addr() ) ) );
return (pos);
}
/**
* Find the source iterator for the first multicast routing entry
* for a source address.
*
* @param source_addr the source address to search for.
* @return the iterator for first entry with source address that
* matches @ref source_addr. If no matching entry is found, the
* return value is @ref source_by_addr_end().
*/
const_sg_iterator source_by_addr_begin(const IPvX& source_addr) const {
const_sg_iterator pos
= _sg_table.lower_bound(
MreSgKey(SourceGroup(source_addr,
IPvX::ZERO(source_addr.af()) ) ) );
return (pos);
}
/**
* Find the source iterator for the one-after-the-last multicast routing
* entry for a source address.
*
* @param source_addr the source address to search for.
* @return the iterator for one-after-the-last entry with source address
* that matches @ref source_addr. If no such entry exists, the
* return value is @ref sg_end().
*/
const_sg_iterator source_by_addr_end(const IPvX& source_addr) const {
if (source_addr == IPvX::ALL_ONES(source_addr.af()))
return (_sg_table.end()); // XXX: special case
IPvX next_source_addr(source_addr);
++next_source_addr;
const_sg_iterator pos
= _sg_table.lower_bound(
MreSgKey(SourceGroup(next_source_addr,
IPvX::ZERO(next_source_addr.af()) ) ) );
return (pos);
}
/**
* Find the group iterator for the first multicast routing entry
* for a group address.
*
* @param group_addr the group address to search for.
* @return the iterator for first entry with group address that
* matches @ref group_addr. If no matching entry is found, the
* return value is @ref group_by_addr_end().
*/
const_gs_iterator group_by_addr_begin(const IPvX& group_addr) const {
const_gs_iterator pos
= _gs_table.lower_bound(
MreGsKey(SourceGroup(IPvX::ZERO(group_addr.af()),
group_addr ) ) );
return (pos);
}
/**
* Find the group iterator for the one-after-the-last multicast routing
* entry for a group address.
*
* @param group_addr the group address prefix to search for.
* @return the iterator for one-after-the-last entry with group address
* that matches @ref group_addr. If no such entry exists, the
* return value is @ref gs_end().
*/
const_gs_iterator group_by_addr_end(const IPvX& group_addr) const {
if (group_addr == IPvX::ALL_ONES(group_addr.af()))
return (_gs_table.end()); // XXX: special case
IPvX next_group_addr(group_addr);
++next_group_addr;
const_gs_iterator pos
= _gs_table.lower_bound(
MreGsKey(SourceGroup(IPvX::ZERO(next_group_addr.af()),
next_group_addr ) ) );
return (pos);
}
/**
* Find the group iterator for the multicast routing entry
* for a source and a group address.
*
* @param source_addr the source address to search for.
* @param group_addr the group address to search for.
* @return the iterator for entry with source and group address that
* matches @ref source_addr and @ref group_addr. If no matching
* entry is found, the return value is the next entry.
*/
const_gs_iterator group_source_by_addr_begin(
const IPvX& source_addr,
const IPvX& group_addr) const {
const_gs_iterator pos
= _gs_table.lower_bound(
MreGsKey(SourceGroup(source_addr,
group_addr ) ) );
return (pos);
}
/**
* Find the source iterator for the multicast routing entry
* for a source and a group address.
*
* @param source_addr the source address to search for.
* @param group_addr the group address to search for.
* @return the iterator for entry with source and group address that
* matches @ref source_addr and @ref group_addr. If no matching
* entry is found, the return value is the next entry.
*/
const_sg_iterator source_group_by_addr_begin(
const IPvX& source_addr,
const IPvX& group_addr) const {
const_sg_iterator pos
= _sg_table.lower_bound(
MreSgKey(SourceGroup(source_addr,
group_addr ) ) );
return (pos);
}
private:
SgMap _sg_table; // The (S,G) source-first lookup table
GsMap _gs_table; // The (G,S) group-first lookup table
};
/**
* @short Template class for the Multicast Routing Entry.
*/
template <class E>
class Mre {
public:
/**
* Constructor for a given source and group address.
*
* @param source_addr the source address of the entry.
* @param group_addr the group address of the entry.
*/
Mre(const IPvX& source_addr, const IPvX& group_addr)
: _source_group(source_addr, group_addr) {
//
// XXX: the iterators below should be set to
// _sg_table.end() and _gs_table.end() in the Mrt, but here
// we don't know those values. Sigh...
//
_sg_key = NULL;
_gs_key = NULL;
}
/**
* Destructor
*/
virtual ~Mre() {};
/**
* Get the source-group entry.
*
* @return a reference to the @ref SourceGroup source-group entry
*/
const SourceGroup& source_group() const { return (_source_group); }
/**
* Get the source address.
*
* @return the source address of the entry.
*/
const IPvX& source_addr() const { return (_source_group.source_addr()); }
/**
* Get the group address.
*
* @return the group address of the entry.
*/
const IPvX& group_addr() const { return (_source_group.group_addr()); }
/**
* Test if this entry matches a source address prefix.
*
* @param prefix_s the source address prefix to match against.
* @return true if the entry source address belongs to address
* prefix @ref prefix_s, otherwise false.
*/
bool is_same_prefix_s(const IPvXNet& prefix_s) const {
return (prefix_s.contains(_source_addr));
}
/**
* Test if this entry matches a group address prefix.
*
* @param prefix_g the group address prefix to match against.
* @return true if the entry group address belongs to address
* prefix @ref prefix_g, otherwise false.
*/
bool is_same_prefix_g(const IPvXNet& prefix_g) const {
return (prefix_g.contains(_group_addr));
}
/**
* Get the source-group table iterator.
*
* @return the source-group table iterator for this entry.
*/
const Mrt<E>::sg_iterator& sg_key() const { return (_sg_key); }
/**
* Get the group-source table iterator.
*
* @return the group-source table for this entry.
*/
const Mrt<E>::gs_iterator& gs_key() const { return (_gs_key); }
/**
* Convert this entry from binary form to presentation format.
*
* @return C++ string with the human-readable ASCII representation
* of the entry.
*/
string str() const {
return (string("(") + source_addr().str()
+ string(", ") + group_addr().str()
+ string(")"));
}
protected:
friend Mrt<E>;
private:
// Mre state
const SourceGroup _source_group; // The source and group addresses
Mrt<E>::sg_iterator _sg_key; // The source-group table iterator
Mrt<E>::gs_iterator _gs_key; // The group-source table iterator
};
//
// Deferred definitions
//
//
// Global variables
//
//
// Global functions prototypes
//
#endif // __MRT_MRT_HH__
| Generated by: pavlin on possum.icir.org on Wed Dec 11 16:50:45 2002, using kdoc 2.0a54+XORP. |
