Source: ../../bgp/peer_data.hh
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// -*- c-basic-offset: 4; tab-width: 8; indent-tabs-mode: t -*-
// Copyright (c) 2001-2006 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/bgp/peer_data.hh,v 1.21 2006/04/15 07:10:35 atanu Exp $
#ifndef __BGP_PEER_DATA_HH__
#define __BGP_PEER_DATA_HH__
#include <config.h>
#include <sys/types.h>
#include <list>
#include "libxorp/ipv4.hh"
#include "libxorp/ipv6.hh"
#include "libxorp/asnum.hh"
#include "iptuple.hh"
#include "parameter.hh"
#include "local_data.hh"
const size_t BGPVERSION = 4;
/**
* Types of BGP Peering Sessions
*/
enum PeerType {
PEER_TYPE_EBGP = 0, // Standard E-BGP peering
PEER_TYPE_IBGP = 1, // Standard I-BGP peering
PEER_TYPE_EBGP_CONFED = 2, // Confederation E-BGP peering
PEER_TYPE_IBGP_CLIENT = 3, // Route reflection client I-BGP.
PEER_TYPE_UNCONFIGURED = 4, // The peer type has not yet been configured.
PEER_TYPE_INTERNAL = 255 // connects to RIB
} ;
/**
* The value of a configuration variable and its state enable/disabled.
*/
template <typename A>
class ConfigVar {
public:
ConfigVar(A var, bool enabled = false) : _var(var), _enabled(enabled)
{}
void set_var(A var) {
_var = var;
}
A get_var() const {
return _var;
}
void set_enabled(bool enabled) {
_enabled = enabled;
}
bool get_enabled() const {
return _enabled;
}
private:
A _var;
bool _enabled;
};
/**
* Data that applies to a specific peering.
*/
class BGPPeerData {
public:
BGPPeerData(const LocalData& local_data, const Iptuple& iptuple, AsNum as,
const IPv4& next_hop, const uint16_t holdtime);
~BGPPeerData();
const Iptuple& iptuple() const { return _iptuple; }
const AsNum& as() const { return _as; }
void set_as(const AsNum& a) { _as = a; }
uint32_t get_hold_duration() const;
void set_hold_duration(uint32_t d);
uint32_t get_retry_duration() const;
void set_retry_duration(uint32_t d);
uint32_t get_keepalive_duration() const;
void set_keepalive_duration(uint32_t d);
/**
* The peers BGP ID.
*/
const IPv4& id() const { return _id; }
void set_id(const IPv4& i) { _id = i; }
bool route_reflector() const { return _route_reflector; }
void set_route_reflector(bool rr) { _route_reflector = rr; }
bool confederation() const { return _confederation; }
void set_confederation(bool conf) { _confederation = conf; }
/**
* @return the prefix limit.
*/
ConfigVar<uint32_t>& get_prefix_limit() {
return _prefix_limit;
}
/**
* Return this routers AS number. Normally this is simple, but if
* this router is in a confederation then the AS number depends on
* the the type of the peering.
*/
const AsNum my_AS_number() const;
/**
* Compute the type of this peering.
*/
void compute_peer_type();
string get_peer_type_str() const;
PeerType get_peer_type() const;
/**
* true if peer type is either PEER_TYPE_IBGP or PEER_TYPE_IBGP_CLIENT
*/
bool ibgp() const;
/**
* true if peer type is PEER_TYPE_IEBGP
*/
bool ibgp_vanilla() const;
/**
* true if peer type is PEER_TYPE_IBGP_CLIENT
*/
bool ibgp_client() const;
/**
* true if peer type is PEER_TYPE_EBGP
*/
bool ebgp_vanilla() const;
/**
* true if peer type is PEER_TYPE_EBGP_CONFED
*/
bool ebgp_confed() const;
void add_recv_parameter(const ParameterNode& p) {
add_parameter(_recv_parameters, p);
};
void remove_recv_parameter(const ParameterNode& p) {
remove_parameter(_recv_parameters, p);
};
void add_sent_parameter(const ParameterNode& p){
add_parameter(_sent_parameters, p);
};
void remove_sent_parameter(const ParameterNode& p){
remove_parameter(_sent_parameters, p);
};
void add_negotiated_parameter(const ParameterNode& p){
add_parameter(_negotiated_parameters, p);
};
void remove_negotiated_parameter(const ParameterNode& p) {
remove_parameter(_negotiated_parameters, p);
};
const ParameterList& parameter_recv_list() const {
return _recv_parameters;
}
const ParameterList& parameter_sent_list() const {
return _sent_parameters;
}
const ParameterList& parameter_negotiated_list() const {
return _negotiated_parameters;
}
/**
* Take the optional parameters out of an open packet and save
* them in _recv_parameters. The list is accessible through the
* parameter_recv_list method.
*/
void save_parameters(const ParameterList& parameter_list);
/**
* Go through the parameters that we have sent and the ones that
* our peer has sent us and drop state into the
* _negotiated_parameters list.
*/
void open_negotiation();
/**
* Multiprotocol option negotiation.
*/
enum Direction {
SENT = 0, // Sent by us.
RECEIVED = 1, // Received from peer.
NEGOTIATED = 2, // Both sides agree.
// Note: ARRAY_SIZE must be larger than all previous values
ARRAY_SIZE = 3
};
/**
* Which multiprotocol parameters did we send,receive and negotiate
*
* @param safi - Subsequent address family identifier
* @param d - direction, SENT, RECEIVED or NEGOTIATED
*
* @return true if this parameter was set
*/
template <class A> bool multiprotocol(Safi safi,
Direction d = NEGOTIATED) const {
XLOG_ASSERT(static_cast<size_t>(d) < sizeof(_ipv4_unicast));
XLOG_ASSERT(static_cast<size_t>(d) < sizeof(_ipv4_multicast));
XLOG_ASSERT(static_cast<size_t>(d) < sizeof(_ipv6_unicast));
XLOG_ASSERT(static_cast<size_t>(d) < sizeof(_ipv6_multicast));
switch(A::ip_version()) {
case 4:
switch(safi) {
case SAFI_UNICAST:
return _ipv4_unicast[d];
break;
case SAFI_MULTICAST:
return _ipv4_multicast[d];
break;
}
break;
case 6:
switch(safi) {
case SAFI_UNICAST:
return _ipv6_unicast[d];
break;
case SAFI_MULTICAST:
return _ipv6_multicast[d];
break;
}
break;
default:
XLOG_FATAL("Unknown IP version %u",
XORP_UINT_CAST(A::ip_version()));
break;
}
XLOG_UNREACHABLE();
return false;
}
#if 0
bool ipv4_unicast(Direction d = NEGOTIATED) const {
return _ipv4_unicast[d];
}
bool ipv6_unicast(Direction d = NEGOTIATED) const {
return _ipv6_unicast[d];
}
bool ipv4_multicast(Direction d = NEGOTIATED) const {
return _ipv4_multicast[d];
}
bool ipv6_multicast(Direction d = NEGOTIATED) const {
return _ipv6_multicast[d];
}
#endif
void set_v4_local_addr(const IPv4& addr) { _nexthop_ipv4 = addr; }
void set_v6_local_addr(const IPv6& addr) { _nexthop_ipv6 = addr; }
const IPv4& get_v4_local_addr() const { return _nexthop_ipv4; }
const IPv6& get_v6_local_addr() const { return _nexthop_ipv6; }
void set_configured_hold_time(uint16_t hold) {
_configured_hold_time = hold;
}
uint16_t get_configured_hold_time() const {
return _configured_hold_time;
}
void set_delay_open_time(uint32_t delay_open_time) {
_delay_open_time = delay_open_time;
}
uint32_t get_delay_open_time() const {
return _delay_open_time;
}
void set_next_hop_rewrite(const IPv4& next_hop) {
_next_hop_rewrite = next_hop;
}
const IPv4 get_next_hop_rewrite() const {
return _next_hop_rewrite;
}
void set_md5_password(const string &password) { _md5_password = password; }
const string& get_md5_password() const { return _md5_password; }
/**
* Dump the state of the peer data (debugging).
*/
void dump_peer_data() const;
protected:
private:
const LocalData& _local_data;
void add_parameter(ParameterList& p_list, const ParameterNode& p);
void remove_parameter(ParameterList& p_list, const ParameterNode& p);
/**
* Local Interface, Local Server Port, Peer Interface and
* Peer Server Port tuple.
*/
const Iptuple _iptuple;
AsNum _as; // Peer's AS number.
bool _route_reflector; // True if this is a route reflector client.
bool _confederation; // True if this is a confederation peer.
/**
* If enabled the maximum number of prefixes that will be accepted
* on a peer before the session is torn down.
*/
ConfigVar<uint32_t> _prefix_limit;
/**
* Holdtime in seconds. Value sent in open negotiation.
*/
uint16_t _configured_hold_time;
/**
* The number of seconds to wait before sending an open message.
*/
uint32_t _delay_open_time;
/**
* Peer's BGP ID.
*/
IPv4 _id;
/*
** These values in seconds.
*/
uint32_t _hold_duration;
uint32_t _retry_duration;
uint32_t _keepalive_duration;
/**
* IPv4 nexthop
*/
IPv4 _nexthop_ipv4;
/**
* IPv6 nexthop
*/
IPv6 _nexthop_ipv6;
PeerType _peer_type; // the type of this peering session
/**
* Parameters received by our peer.
*/
ParameterList _recv_parameters;
/**
* Parameters that we have sent.
*/
ParameterList _sent_parameters;
/**
* The options that we have both agreed on.
*/
ParameterList _negotiated_parameters;
/**
* The set of different topologies that we support.
*/
bool _ipv4_unicast[ARRAY_SIZE];
bool _ipv6_unicast[ARRAY_SIZE];
bool _ipv4_multicast[ARRAY_SIZE];
bool _ipv6_multicast[ARRAY_SIZE];
/* XXX
** Eventually we will have totally programmable filters. As a
** temporary hack store the re-write value here.
*/
IPv4 _next_hop_rewrite;
/**
* The password for TCP-MD5 authentication.
*/
string _md5_password;
};
#endif // __BGP_PEER_DATA_HH__
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