// -*- 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/rib/rib.hh,v 1.1.1.1 2002/12/11 23:56:13 hodson Exp $
#ifndef __RIB_RIB_HH__
#define __RIB_RIB_HH__
#include <string>
#include "libxorp/xorp.h"
#include "libxorp/ipv4.hh"
#include "libxorp/ipv6.hh"
#include "libxorp/ipnet.hh"
#include "libxorp/nexthop.hh"
#include "libxorp/vif.hh"
#include "route.hh"
#include "rt_tab_base.hh"
#include "rt_tab_origin.hh"
#include "rt_tab_merged.hh"
#include "rt_tab_extint.hh"
#include "rt_tab_redist.hh"
#include "rt_tab_register.hh"
#include "rt_tab_export.hh"
class FeaClient;
class RegisterServer;
enum RibTransportType {
UNICAST = 1,
MULTICAST = 2
};
/**
* @short Master class for a RIB.
*
* RIB is the master class for a Routing Information Base. It holds
* the Vif table, routing tables for each protocol, etc. Typically we
* would have one RIB for IPv4 unicast, one for IPv4 multicast
* topology, one for IPv6 unicast and one for IPv6 multicast.
*
* Note that the XRL commands assume some level of filtering has already
* taken place to route to command to the right RIB.
*/
template<class A>
class RIB {
public:
/**
* RIB Constructor.
*
* @param rib_type indicates whether this RIB holds UNICAST or
* MULTICAST routing information. In the case of multicast, this
* is the topology information, not the forwarding information.
*/
RIB(RibTransportType rib_type);
/**
* RIB Destructor.
*/
virtual ~RIB();
/**
* Initialize the RIB's ExportTable so that the winning routes are
* exported to the Forwarding Engine.
*
* @see ExportTable
* @return -1 if already initialized.
*/
int initialize_export(FeaClient *fea);
/**
* Initialize the RIB's RegisterTable. The RegisterTable allows
* routing protocols such as BGP to register interest in routing
* information that affects specfic addresses.
*
* @return -1 if already initialized.
*/
int initialize_register(RegisterServer *regserv);
/**
* Add a new OriginTable. Use is deprecated, except in test suites.
*
* @see OriginTable
* @param tablename human-readable name for this table to help in
* debugging
* @param admin_distance default administrative distance to be
* applied to routes that enter the RIB through this OriginTable.
* @param igp true if the routing protocol that will inject routes
* is a Interior Gateway Protocol such as OSPF. False if it's an
* EGP such as BGP (or IBGP).
* @return -1 if table cannot be created, 0 otherwise.
*/
int new_origin_table(const string& tablename,
int admin_distance,
int igp);
/**
* Add a new MergedTable. Use is deprecated, except in test suites.
*
* @see MergedTable
* @param tablename human-readable name for this table to help in
* debugging
* @param table_a parent routing table that will feed routes in to
* this MergedTable
* @param table_b parent routing table that will feed routes in to
* this MergedTable
* @return 0 on success, -1 if table_a or table_b does not exist.
*/
int new_merged_table(const string& tablename,
const string& table_a,
const string& table_b);
/**
* Add a new ExtIntTable. Use is deprecated, except in test suites.
*
* @see ExtIntTable
* @param tablename human-readable name for this table to help in
* debugging
* @param t_ext parent routing table that will feed EGP routes in to
* this ExtIntTable
* @param t_int parent routing table that will feed IGP routes in to
* this ExtIntTable
* @return 0 on success, -1 if t_ext or t_int does not exist.
*/
int new_extint_table(const string& tablename,
const string& t_ext,
const string& t_int);
/**
* Inform the RIB about the existence of a Virtual Interface.
*
* @see Vif
* @param vifname the name of the VIF, as understood by the FEA.
* @param vif Vif class instance giving the information about this vif.
* @return 0 on success, -1 if vif named vifname already exists.
*/
virtual int new_vif(const string& vifname, const Vif& vif);
/**
* Inform the RIB that a VIF no longer exists.
*
* @param vifname the name of the VIF, as previously indicated by new_vif.
* @return 0 on success, -1 if vif named vifname doesn't exist.
*/
virtual int delete_vif(const string& vifname);
/**
* Add an address and subnet to a existing VIF. Each VIF may have
* multiple addresses and associated subnets.
*
* @param vifname the name of the VIF the address will be added to.
* @param addr the address to be added. This must be one of the
* addresses of this router.
* @param net the subnet that is connected to this VIF
* corresponding to the address addr.
* @return 0 on success, -1 if vif is unknown.
*/
virtual int add_vif_address(const string& vifname,
const A& addr,
const IPNet<A>& net);
/**
* Remove an address and the associated subnet from an existing VIF.
* @param vifname the name of the VIF the address will be removed from.
* @param addr the address to be removed. This must be an address
* previously added by add_vif_address
* @return 0 on success, -1 if vif is unknown or addr is not an
* address on this vif.
*/
virtual int delete_vif_address(const string& vifname,
const A& addr);
/**
* Add a route via the OriginTable called tablename.
*
* @param tablename the name of the OriginTable into which the
* route should be inserted.
* @param net the subnet (address and prefix length) of the route.
* @param addr the nexthop that packets destined for net should be
* forwarded to.
* @param the routing protocol metric associated with this route.
* @return 0 on success, -1 otherwise.
*/
virtual int add_route(const string& tablename,
const IPNet<A>& net,
const A& addr,
uint32_t metric);
/**
* Replace an existing route via the OriginTable called tablename.
*
* @param tablename the name of the OriginTable in which the
* route should be replaced.
* @param net the subnet (address and prefix length) of the route.
* @param addr the new nexthop that packets destined for @ref net should be
* forwarded to.
* @param the new routing protocol metric associated with this route.
* @return 0 on success, -1 otherwise.
*/
virtual int replace_route(const string& tablename,
const IPNet<A>& net,
const A& addr,
uint32_t metric);
/**
* Verify that expected routing information is correct. This is
* intended for testing purposes only.
*
* @return 0 on successful
* verification, -1 otherwise.
*/
virtual int verify_route(const A& lookupaddr,
const string& ifname,
const A& nexthop,
uint32_t metric);
/**
* Delete an existing route via the OriginTable called tablename.
*
* @param tablename the name of the OriginTable in which the
* route should be deleted.
* @param subnet the subnet (address and prefix length) of the
* route to be deleted.
* @return 0 on success, -1 otherwise.
*/
virtual int delete_route(const string& tablename,
const IPNet<A>& subnet);
/**
* Lookup an address in the RIB to determine the nexthop router to
* which packets for this address will be forwarded.
*
* @param lookupaddr the address to be looked up.
* @return pointer to address of next hop for @ref lookupaddr if
* available, A::ZERO() otherwise.
*/
virtual const A& lookup_route(const A& lookupaddr);
/**
* Used for debugging only
*/
virtual RouteRange<A>* route_range_lookup(const A& lookupaddr);
/**
* Register interest in being notified about all changes to
* routing information that would affect traffic destined for a
* particular address
*
* @param lookupaddr the address to register interest in.
* @param module the XRL module name to which notifications of
* changes should be sent.
*/
virtual RouteRegister<A>* route_register(const A& lookupaddr,
const string& module);
/**
* De-register interest in being notified about all changes to
* routing information for a particular address.
*
* @see RIB<A>::route_register
*
* @param lookupaddr the address to de-register interest in.
* @param module the XRL module name to which notifications of
* changes should no longer be sent.
* @return true on successful deregistration, false if the entry
* to be deregistered was not found.
*/
virtual bool route_deregister(const IPNet<A> &subnet, const string &module);
/**
* Enable Redistribution.
*
* @param fromtable the name of the source redistribition table.
* @param totable the name of the destination table to which
* routes should be redistributed (must be an OriginTable<A>
* name).
* @return 0 on success, -1 if either table does not exists or
* redistribution is already enabled.
*/
virtual int redist_enable(const string& fromtable, const string& totable);
/**
* Disable redistribution.
*
* @param fromtable the name of the source redistribition table.
* @param totable the name of the destination table to which
* routes were previously redistributed (must be an OriginTable<A>
* name).
* @return 0 on success, -1 if table does not exist.
*/
virtual int redist_disable(const string& fromtable, const string& totable);
/**
* Create the OriginTable for an IGP protocol and plumb it into
* the RIB. Typically this will be called when a new instance of
* an IGP routing protocol such as OSPF starts up.
*
* @param tablename the routing protocol name. This should be one
* of the list of names the RIB knows about, or the incorrect
* default administrative distance will be applied.
* @return 0 on success, -1 otherwise.
*/
virtual int add_igp_table(const string& tablename);
/**
* Delete the OriginTable for an IGP protocol and unplumb it from
* the RIB. Typically this will be called when an instance of
* an IGP routing protocol such as OSPF exits.
*
* @param tablename the routing protocol name, previously
* registered using @ref add_igp_table .
* @return 0 on success, -1 otherwise.
*/
virtual int delete_igp_table(const string& tablename);
/**
* Create the OriginTable for an EGP protocol and plumb it into
* the RIB. Typically this will be called when a new instance of
* an EGP routing protocol such as EBGP or IBGP starts up. Note
* that EBGP and IBGP should register separately.
*
* @param tablename the routing protocol name. This should be one
* of the list of names the RIB knows about, or the incorrect
* default administrative distance will be applied.
* @return 0 on success, -1 otherwise.
*/
virtual int add_egp_table(const string& tablename);
/**
* Delete the OriginTable for an EGP protocol and unplumb it from
* the RIB. Typically this will be called when an instance of
* an EGP routing protocol such as BGP exits.
*
* @param tablename the routing protocol name, previously
* registered using @ref add_igp_table .
* @return 0 on success, -1 otherwise.
*/
virtual int delete_egp_table(const string& tablename);
/**
* Print the RIB structure for debugging
*/
void print_rib() const;
private:
/**
* Used to implement @ref add_igp_table and @ref add_egp_table.
*
* @param tablename the routing protocol name.
* @param type IGP == 1, EGP == 2
*/
int add_origin_table(const string& tablename, int type);
/**
* Used to implement @ref delete_igp_table and @ref delete_egp_table.
*
* @param tablename the routing protocol name.
*/
int delete_origin_table(const string& tablename);
/**
* track_back trough the RouteTables' parent pointers to find the
* last (i.e, nearest the OriginTable) table that matches the mask
* in @ref typemask. If the table given by @ref rt doesn't match
* the mask, return it anyway. If a table has more than one
* parent, then this is an error.
*
* @param rt the routing table to start with.
* @param typemask the bitwise-or of the routing table types that
* we may track back through.
* @returns the last matching table, or @ref rt if rt itself doesn't match.
*/
RouteTable<A>* track_back(RouteTable<A> *rt, int typemask) const;
/**
* track_forward trough the RouteTables' child pointers to find
* the last (i.e, nearest the ExportTable) table that matches the
* mask in @ref typemask. Unlike track_back, if @ref rt doesn't
* match, but the next does, the track forward anyway.
*
* @param rt the routing table to start with.
* @param typemask the bitwise-or of the routing table types that
* we may track forward through.
* @returns the last matching table
*/
RouteTable<A>* track_forward(RouteTable<A> *rt, int typemask) const;
/**
* Find a routing table, given its table name
*
* @param tablename the name of the table to search for.
* @return pointer to table if exists, 0 otherwise.
*/
inline RouteTable<A>* find_table(const string& tablename);
/**
* Add table to RIB, but don't do any plumbing. The caller should
* first check that table does not already exist using @ref
* find_table.
*
* @param tablename the name of the table to be added.
* @param table the table to be added.
* @return 0 on success, -1 if named table already exists.
*/
inline int add_table(const string& tablename, RouteTable<A>* table);
/**
* Remove table from RIB, but don't do any unplumbing.
* The table is not deleted by this.
*
* @param tablename the name of the table to be removed.
* @return 0 on success, -1 if named table does not exist.
*/
inline int remove_table(const string& tablename);
/**
* Lookup the default admin distance associated with a routing
* protocol name.
*
* @param protocol_name the canonical name of a routing protocol,
* in lower case. Eg "ospf", "ibgp", etc.
* @return the admin distance.
*/
inline int admin_distance(const string& protocol_name);
/**
* Find the virtual interface associated with one of this router's
* addresses
*
* @param addr the IP address to lookup
* @return pointer to Vif on success, 0 otherwise.
*/
inline Vif* find_vif(const A& addr);
/**
* Find the IP External Nexthop class instance associated with an IP
* address.
*
* @param addr the IP address of the nexthop router
* @return pointer to external next hop if it exists, 0 otherwise.
*/
inline IPExternalNextHop<A>* find_external_nexthop(const A& addr);
/**
* Find the IP Peer Nexthop class instance associated with an IP
* address.
*
* @param addr the IP address of the nexthop router
* @return pointer to peer next hop if it exists, 0 otherwise.
*/
inline IPPeerNextHop<A>* find_peer_nexthop(const A& addr);
/**
* Find or create the IP External Nexthop class instance
* associated with an IP address.
*
* @param addr the IP address of the nexthop router
* @returns the IPExternalNextHop class instance for @ref addr
*/
inline IPExternalNextHop<A>*
find_or_create_external_nexthop(const A& addr);
/**
* Find or create the IP Peer Nexthop class instance
* associated with an IP address.
*
* @param addr the IP address of the nexthop router
* @returns the IPPeerNextHop class instance for @ref addr
*/
inline IPPeerNextHop<A>*
find_or_create_peer_nexthop(const A& addr);
/**
* not implemented - force use of default copy constuctor to fail
*/
RIB(const RIB& );
/**
* not implemented - force use of default assignment operator to fail
*/
RIB& operator=(const RIB&);
/**
* Flush out routing table changes to other processes.
*/
void flush();
protected:
RouteTable<A>* _final_table;
RegisterTable<A>* _register_table;
bool _mcast;
map<const string, RouteTable<A>*> _tables;
map<const string, Vif> _vifs;
map<const string, int> _admin_distances;
map<const A, IPExternalNextHop<A> > _external_nexthops;
map<const A, IPPeerNextHop<A> > _peer_nexthops;
};
typedef RIB<IPv4> IPv4RIB;
typedef RIB<IPv6> IPv6RIB;
#endif // __RIB_RIB_HH__
| Generated by: pavlin on possum.icir.org on Wed Dec 11 16:51:00 2002, using kdoc 2.0a54+XORP. |
