Source: ../../fea/mfea_mrouter.hh
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// -*- c-basic-offset: 4; tab-width: 8; indent-tabs-mode: t -*-
// Copyright (c) 2001-2008 XORP, Inc.
//
// 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/fea/mfea_mrouter.hh,v 1.24 2008/07/23 05:10:11 pavlin Exp $
#ifndef __FEA_MFEA_MROUTER_HH__
#define __FEA_MFEA_MROUTER_HH__
//
// Multicast routing kernel-access specific definitions.
//
#ifdef HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif
#include "libxorp/eventloop.hh"
#include "libproto/proto_unit.hh"
//
// Constants definitions
//
//
// Structures/classes, typedefs and macros
//
class IPvX;
class MfeaNode;
class SgCount;
class TimeVal;
class VifCount;
/**
* @short A class for multicast routing related I/O communication.
*
* In case of UNIX kernels, we cannot have more than one MfeaMrouter
* per address family (i.e., one per IPv4, and one per IPv6).
*/
class MfeaMrouter : public ProtoUnit {
public:
/**
* Constructor for given MFEA node.
*
* @param mfea_node the MFEA node (@ref MfeaNode) this entry belongs to.
*/
MfeaMrouter(MfeaNode& mfea_node);
/**
* Destructor
*/
virtual ~MfeaMrouter();
/**
* Start the @ref MfeaMrouter.
*
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int start();
/**
* Stop the @ref MfeaMrouter.
*
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int stop();
/**
* Test if the underlying system supports IPv4 multicast routing.
*
* @return true if the underlying system supports IPv4 multicast routing,
* otherwise false.
*/
bool have_multicast_routing4() const;
/**
* Test if the underlying system supports IPv6 multicast routing.
*
* @return true if the underlying system supports IPv6 multicast routing,
* otherwise false.
*/
bool have_multicast_routing6() const;
/**
* Test whether the IPv4 multicast forwarding engine is enabled or disabled
* to forward packets.
*
* @param ret_value if true on return, then the IPv4 multicast forwarding
* is enabled, otherwise is disabled.
* @param error_msg the error message (if error).
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int multicast_forwarding_enabled4(bool& ret_value,
string& error_msg) const;
/**
* Test whether the IPv6 multicast forwarding engine is enabled or disabled
* to forward packets.
*
* @param ret_value if true on return, then the IPv6 multicast forwarding
* is enabled, otherwise is disabled.
* @param error_msg the error message (if error).
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int multicast_forwarding_enabled6(bool& ret_value,
string& error_msg) const;
/**
* Set the IPv4 multicast forwarding engine to enable or disable forwarding
* of packets.
*
* @param v if true, then enable IPv4 multicast forwarding, otherwise
* disable it.
* @param error_msg the error message (if error).
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int set_multicast_forwarding_enabled4(bool v, string& error_msg);
/**
* Set the IPv6 multicast forwarding engine to enable or disable forwarding
* of packets.
*
* @param v if true, then enable IPv6 multicast forwarding, otherwise
* disable it.
* @param error_msg the error message (if error).
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int set_multicast_forwarding_enabled6(bool v, string& error_msg);
/**
* Get the protocol that would be used in case of mrouter socket.
*
* Return value: the protocol number on success, otherwise -1.
**/
int kernel_mrouter_ip_protocol() const;
/**
* Get the mrouter socket.
*
* The mrouter socket is used for various multicast-related access.
*
* @return the socket value.
*/
XorpFd mrouter_socket() const { return (_mrouter_socket); }
/**
* Start/enable the multicast routing in the kernel.
*
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int start_mrt();
/**
* Stop/disable the multicast routing in the kernel.
*
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int stop_mrt();
/**
* Start/enable PIM processing in the kernel.
*
* @param error_msg the error message (if error).
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int start_pim(string& error_msg);
/**
* Stop/disable PIM processing in the kernel.
*
* @param error_msg the error message (if error).
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int stop_pim(string& error_msg);
/**
* Add a virtual multicast interface to the kernel.
*
* @param vif_index the vif index of the virtual interface to add.
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int add_multicast_vif(uint32_t vif_index);
/**
* Delete a virtual multicast interface from the kernel.
*
* @param vif_index the vif index of the interface to delete.
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int delete_multicast_vif(uint32_t vif_index);
/**
* Install/modify a Multicast Forwarding Cache (MFC) entry in the kernel.
*
* If the MFC entry specified by (source, group) pair was not
* installed before, a new MFC entry will be created in the kernel;
* otherwise, the existing entry's fields will be modified.
*
* @param source the MFC source address.
* @param group the MFC group address.
* @param iif_vif_index the MFC incoming interface index.
* @param oifs_ttl an array with the min. TTL a packet should have to be
* forwarded.
* @param oifs_flags an array with misc. flags for the MFC to install.
* Note that those flags are supported only by the advanced multicast API.
* @param rp_addr the RP address.
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int add_mfc(const IPvX& source, const IPvX& group,
uint32_t iif_vif_index, uint8_t *oifs_ttl,
uint8_t *oifs_flags,
const IPvX& rp_addr);
/**
* Delete a Multicast Forwarding Cache (MFC) entry in the kernel.
*
* @param source the MFC source address.
* @param group the MFC group address.
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int delete_mfc(const IPvX& source, const IPvX& group);
/**
* Add a dataflow monitor entry in the kernel.
*
* Note: either @ref is_threshold_in_packets or @ref is_threshold_in_bytes
* (or both) must be true.
* Note: either @ref is_geq_upcall or @ref is_leq_upcall
* (but not both) must be true.
*
* @param source the source address.
* @param group the group address.
* @param threshold_interval the dataflow threshold interval.
* @param threshold_packets the threshold (in number of packets) to
* compare against.
* @param threshold_bytes the threshold (in number of bytes) to
* compare against.
* @param is_threshold_in_packets if true, @ref threshold_packets is valid.
* @param is_threshold_in_bytes if true, @ref threshold_bytes is valid.
* @param is_geq_upcall if true, the operation for comparison is ">=".
* @param is_leq_upcall if true, the operation for comparison is "<=".
* @param error_msg the error message (if error).
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int add_bw_upcall(const IPvX& source, const IPvX& group,
const TimeVal& threshold_interval,
uint32_t threshold_packets,
uint32_t threshold_bytes,
bool is_threshold_in_packets,
bool is_threshold_in_bytes,
bool is_geq_upcall,
bool is_leq_upcall,
string& error_msg);
/**
* Delete a dataflow monitor entry from the kernel.
*
* Note: either @ref is_threshold_in_packets or @ref is_threshold_in_bytes
* (or both) must be true.
* Note: either @ref is_geq_upcall or @ref is_leq_upcall
* (but not both) must be true.
*
* @param source the source address.
* @param group the group address.
* @param threshold_interval the dataflow threshold interval.
* @param threshold_packets the threshold (in number of packets) to
* compare against.
* @param threshold_bytes the threshold (in number of bytes) to
* compare against.
* @param is_threshold_in_packets if true, @ref threshold_packets is valid.
* @param is_threshold_in_bytes if true, @ref threshold_bytes is valid.
* @param is_geq_upcall if true, the operation for comparison is ">=".
* @param is_leq_upcall if true, the operation for comparison is "<=".
* @param error_msg the error message (if error).
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int delete_bw_upcall(const IPvX& source, const IPvX& group,
const TimeVal& threshold_interval,
uint32_t threshold_packets,
uint32_t threshold_bytes,
bool is_threshold_in_packets,
bool is_threshold_in_bytes,
bool is_geq_upcall,
bool is_leq_upcall,
string& error_msg);
/**
* Delete all dataflow monitor entries from the kernel
* for a given source and group address.
*
* @param source the source address.
* @param group the group address.
* @param error_msg the error message (if error).
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int delete_all_bw_upcall(const IPvX& source, const IPvX& group,
string& error_msg);
/**
* Get various counters per (S,G) entry.
*
* Get the number of packets and bytes forwarded by a particular
* Multicast Forwarding Cache (MFC) entry in the kernel, and the number
* of packets arrived on wrong interface for that entry.
*
* @param source the MFC source address.
* @param group the MFC group address.
* @param sg_count a reference to a @ref SgCount class to place the result.
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int get_sg_count(const IPvX& source, const IPvX& group,
SgCount& sg_count);
/**
* Get various counters per virtual interface.
*
* Get the number of packets and bytes received on, or forwarded on
* a particular multicast interface.
*
* @param vif_index the vif index of the virtual multicast interface whose
* statistics we need.
* @param vif_count a reference to a @ref VifCount class to store
* the result.
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int get_vif_count(uint32_t vif_index, VifCount& vif_count);
/**
* Get the flag that indicates whether the kernel supports disabling of
* WRONGVIF signal per (S,G) per interface.
*
* @return true if the kernel supports disabling of WRONGVIF signal
* per (S,G) per interface, otherwise false.
*/
bool mrt_api_mrt_mfc_flags_disable_wrongvif() const {
return (_mrt_api_mrt_mfc_flags_disable_wrongvif);
}
/**
* Get the flag that indicates whether the kernel supports setting of
* the Border bit flag per (S,G) per interface.
*
* The Border bit flag is used for PIM-SM Register encapsulation in
* the kernel.
*
* @return true if the kernel supports setting of the Border bit flag
* per (S,G) per interface, otherwise false.
*/
bool mrt_api_mrt_mfc_flags_border_vif() const {
return (_mrt_api_mrt_mfc_flags_border_vif);
}
/**
* Get the flag that indicates whether the kernel supports adding
* the RP address to the kernel.
*
* The RP address is used for PIM-SM Register encapsulation in
* the kernel.
*
* @return true if the kernel supports adding the RP address to the kernel,
* otherwise false.
*/
bool mrt_api_mrt_mfc_rp() const {
return (_mrt_api_mrt_mfc_rp);
}
/**
* Get the flag that indicates whether the kernel supports the bandwidth
* upcall mechanism.
*
* @return true if the kernel supports the bandwidth upcall mechanism.
*/
bool mrt_api_mrt_mfc_bw_upcall() const {
return (_mrt_api_mrt_mfc_bw_upcall);
}
/**
* Process a call from the kernel (e.g., "nocache", "wrongiif", "wholepkt")
* XXX: It is OK for im_src/im6_src to be 0 (for 'nocache' or 'wrongiif'),
* just in case the kernel supports (*,G) MFC.
*
* @param databuf the data buffer.
* @param datalen the length of the data in @ref databuf.
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int kernel_call_process(const uint8_t *databuf, size_t datalen);
private:
// Private functions
MfeaNode& mfea_node() const { return (_mfea_node); }
// Private state
MfeaNode& _mfea_node; // The MFEA node I belong to
XorpFd _mrouter_socket; // The socket for multicast routing access
uint8_t* _rcvbuf0; // Data buffer0 for receiving
uint8_t* _sndbuf0; // Data buffer0 for sending
uint8_t* _rcvbuf1; // Data buffer1 for receiving
uint8_t* _sndbuf1; // Data buffer1 for sending
uint8_t* _rcvcmsgbuf; // Control recv info (IPv6 only)
uint8_t* _sndcmsgbuf; // Control send info (IPv6 only)
struct iovec _rcviov[2]; // The rcvmh scatter/gatter array
struct iovec _sndiov[2]; // The sndmh scatter/gatter array
#ifndef HOST_OS_WINDOWS
struct msghdr _rcvmh; // The msghdr structure used by recvmsg()
struct msghdr _sndmh; // The msghdr structure used by sendmsg()
struct sockaddr_in _from4; // The source addr of recvmsg() msg (IPv4)
struct sockaddr_in _to4; // The dest. addr of sendmsg() msg (IPv4)
#ifdef HAVE_IPV6
struct sockaddr_in6 _from6; // The source addr of recvmsg() msg (IPv6)
struct sockaddr_in6 _to6; // The dest. addr of sendmsg() msg (IPv6)
#endif
#endif // ! HOST_OS_WINDOWS
//
// Flags about various support by the advanced kernel multicast API:
// - support for disabling WRONGVIF signals per vif
// - support for the border bit flag (per MFC per vif)
// - support for kernel-level PIM Register encapsulation
// - support for bandwidth-related upcalls from the kernel
//
bool _mrt_api_mrt_mfc_flags_disable_wrongvif;
bool _mrt_api_mrt_mfc_flags_border_vif;
bool _mrt_api_mrt_mfc_rp;
bool _mrt_api_mrt_mfc_bw_upcall;
//
// Original state from the underlying system before the MFEA was started
//
bool _multicast_forwarding_enabled;
};
/**
* @short Class that contains various counters per (S,G) entry.
*
* All counters are related to the multicast data packets per (S,G) entry.
*/
class SgCount {
public:
/**
* Default constructor
*/
SgCount() : _pktcnt(0), _bytecnt(0), _wrong_if(0) {}
/**
* Assignment Operator
*
* @param sg_count the value to assing to this entry.
* @return the entry with the new value assigned.
*/
SgCount& operator=(const SgCount& sg_count) {
_pktcnt = sg_count.pktcnt();
_bytecnt = sg_count.bytecnt();
_wrong_if = sg_count.wrong_if();
return (*this);
}
/**
* Assign-Sum Operator
*
* @param sg_count the value to add to this entry.
* @return the entry with the new value after @ref sg_count was added.
*/
SgCount& operator+=(const SgCount& sg_count) {
_pktcnt += sg_count.pktcnt();
_bytecnt += sg_count.bytecnt();
_wrong_if += sg_count.wrong_if();
return (*this);
}
/**
* Assign-Difference Operator
*
* @param sg_count the value to substract from this entry.
* @return the entry with the new value after @ref sg_count was
* substracted.
*/
SgCount& operator-=(const SgCount& sg_count) {
_pktcnt -= sg_count.pktcnt();
_bytecnt -= sg_count.bytecnt();
_wrong_if -= sg_count.wrong_if();
return (*this);
}
/**
* Get the packet count.
*
* @return the packet count.
*/
size_t pktcnt() const { return (_pktcnt); }
/**
* Get the byte count.
*
* @return the byte count.
*/
size_t bytecnt() const { return (_bytecnt); }
/**
* Get the number of packets received on wrong interface.
*
* @return the number of packets received on wrong interface.
*/
size_t wrong_if() const { return (_wrong_if); }
/**
* Set the packet count.
*
* @param v the value to assign to the packet count.
*/
void set_pktcnt(size_t v) { _pktcnt = v; }
/**
* Set the byte count.
*
* @param v the value to assign to the byte count.
*/
void set_bytecnt(size_t v) { _bytecnt = v; }
/**
* Set the wrong-interface packet count.
*
* @param v the value to assign to the wrong-interface packet count.
*/
void set_wrong_if(size_t v) { _wrong_if = v; }
/**
* Reset all counters.
*/
void reset() { _pktcnt = 0; _bytecnt = 0; _wrong_if = 0; }
/**
* Test if this entry contains valid counters.
*
* @return true if this entry contains valid counters, otherwise false.
*/
bool is_valid() const { return (! ((_pktcnt == (size_t)~0)
&& (_bytecnt == (size_t)~0)
&& (_wrong_if == (size_t)~0))); }
private:
size_t _pktcnt; // Number of multicast data packets received
size_t _bytecnt; // Number of multicast data bytes received
size_t _wrong_if; // Number of multicast data packets received
// on wrong iif
};
//
// A class that contains information about a vif in the kernel.
//
/**
* @short Class that contains various counters per virtual interface.
*
* All counters are related to the multicast data packets per virtual
* interface.
*/
class VifCount {
public:
/**
* Default constructor
*/
VifCount() : _icount(0), _ocount(0), _ibytes(0), _obytes(0) {}
/**
* Assignment Operator
*
* @param vif_count the value to assign to this entry.
* @return the entry with the new value assigned.
*/
VifCount& operator=(const VifCount& vif_count) {
_icount = vif_count.icount();
_ocount = vif_count.ocount();
_ibytes = vif_count.ibytes();
_obytes = vif_count.obytes();
return (*this);
}
/**
* Get the input packet count.
*
* @return the input packet count.
*/
size_t icount() const { return (_icount); }
/**
* Get the output packet count.
*
* @return the output packet count.
*/
size_t ocount() const { return (_ocount); }
/**
* Get the input byte count.
*
* @return the input byte count.
*/
size_t ibytes() const { return (_ibytes); }
/**
* Get the output byte count.
*
* @return the output byte count.
*/
size_t obytes() const { return (_obytes); }
/**
* Set the input packet count.
*
* @param v the value to assign to the data packet count.
*/
void set_icount(size_t v) { _icount = v; }
/**
* Set the output packet count.
*
* @param v the value to assign to the output packet count.
*/
void set_ocount(size_t v) { _ocount = v; }
/**
* Set the input byte count.
*
* @param v the value to assign to the data byte count.
*/
void set_ibytes(size_t v) { _ibytes = v; }
/**
* Set the output byte count.
*
* @param v the value to assign to the output byte count.
*/
void set_obytes(size_t v) { _obytes = v; }
/**
* Test if this entry contains valid counters.
*
* @return true if this entry contains valid counters, otherwise false.
*/
bool is_valid() const { return (! ((_icount == (size_t)~0)
&& (_ocount == (size_t)~0)
&& (_ibytes == (size_t)~0)
&& (_obytes == (size_t)~0))); }
private:
size_t _icount; // Number of input multicast data packets
size_t _ocount; // Number of output multicast data packets
size_t _ibytes; // Number of input multicast data bytes
size_t _obytes; // Number of output multicast data bytes
};
//
// Global variables
//
//
// Global functions prototypes
//
#endif // __FEA_MFEA_MROUTER_HH__
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