Source: ../../fea/rawsock4.hh
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// -*- c-basic-offset: 4; tab-width: 8; indent-tabs-mode: t -*-
// Copyright (c) 2001-2007 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/fea/rawsock4.hh,v 1.17 2007/02/16 22:45:49 pavlin Exp $
#ifndef __FEA_RAWSOCK4_HH__
#define __FEA_RAWSOCK4_HH__
#include <list>
#include <vector>
#include <set>
#include <map>
#include "libxorp/exceptions.hh"
#include "libxorp/ipv4.hh"
#include "libxorp/eventloop.hh"
#include "rawsock.hh"
/**
* Base class for raw IPv4 sockets.
*/
class RawSocket4 : public RawSocket {
public:
RawSocket4(EventLoop& eventloop, uint32_t ip_protocol,
const IfTree& iftree);
virtual ~RawSocket4();
private:
RawSocket4(const RawSocket4&); // Not implemented.
RawSocket4& operator=(const RawSocket4&); // Not implemented.
};
/**
* Simple structure used to cache commonly passed IPv4 header information
* which comes from socket control message headers. This is used when
* reading from the kernel, so we use C types, rather than XORP C++ Class
* Library types.
*/
struct IPv4HeaderInfo {
string if_name;
string vif_name;
IPv4 src_address;
IPv4 dst_address;
uint32_t ip_protocol;
int32_t ip_ttl;
int32_t ip_tos;
bool ip_router_alert;
};
/**
* A RawSocketClass that allows arbitrary filters to receive the data
* associated with a raw socket.
*/
class FilterRawSocket4 : public RawSocket4 {
public:
/**
* Filter class.
*/
class InputFilter {
public:
virtual ~InputFilter() {}
/**
* Method invoked when data arrives on associated FilterRawSocket4
* instance.
*/
virtual void recv(const struct IPv4HeaderInfo& header,
const vector<uint8_t>& payload) = 0;
/**
* Method invoked by the destructor of the associated
* FilterRawSocket4 instance. This method provides the
* InputFilter with the opportunity to delete itself or update
* it's state. The input filter does not need to call
* FilterRawSocket4::remove_filter() since filter removal is
* automatically conducted.
*/
virtual void bye() = 0;
};
/**
* Joined multicast group class.
*/
class JoinedMulticastGroup {
public:
JoinedMulticastGroup(const string& if_name, const string& vif_name,
const IPv4& group_address)
: _if_name(if_name),
_vif_name(vif_name),
_group_address(group_address)
{}
virtual ~JoinedMulticastGroup() {}
/**
* 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 JoinedMulticastGroup& other) const {
if (_if_name != other._if_name)
return (_if_name < other._if_name);
if (_vif_name != other._vif_name)
return (_vif_name < other._vif_name);
return (_group_address < other._group_address);
}
/**
* 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 JoinedMulticastGroup& other) const {
return ((_if_name == other._if_name) &&
(_vif_name == other._vif_name) &&
(_group_address == other._group_address));
}
/**
* Add a receiver.
*
* @param receiver_name the name of the receiver to add.
*/
void add_receiver(const string& receiver_name) {
_receivers.insert(receiver_name);
}
/**
* Delete a receiver.
*
* @param receiver_name the name of the receiver to delete.
*/
void delete_receiver(const string& receiver_name) {
_receivers.erase(receiver_name);
}
/**
* @return true if there are no receivers associated with this group.
*/
bool empty() const { return _receivers.empty(); }
private:
string _if_name;
string _vif_name;
IPv4 _group_address;
set<string> _receivers;
};
public:
FilterRawSocket4(EventLoop& eventloop, uint32_t protocol,
const IfTree& iftree);
~FilterRawSocket4();
/**
* Add a filter to list of input filters. The FilterRawSocket4 class
* assumes that the callee will be responsible for managing the memory
* associated with the filter and will call remove_filter() if the
* filter is deleted or goes out of scope.
*/
bool add_filter(InputFilter* filter);
/**
* Remove filter from list of input filters.
*/
bool remove_filter(InputFilter* filter);
/**
* @return true if there are no filters associated with this instance.
*/
bool empty() const { return _filters.empty(); }
/**
* Send an IPv4 packet on a raw socket.
*
* @param if_name the interface to send the packet on. It is essential for
* multicast. In the unicast case this field may be empty.
* @param vif_name the vif to send the packet on. It is essential for
* multicast. In the unicast case this field may be empty.
* @param src_address the IP source address.
* @param dst_address the IP destination address.
* @param ip_ttl the IP TTL (hop-limit). If it has a negative value,
* the TTL will be set internally before transmission.
* @param ip_tos the Type Of Service (Diffserv/ECN bits for IPv4).
* If it has a negative value, the TOS will be
* set internally before transmission.
* @param ip_router_alert if true, then add the IP Router Alert option to
* the IP packet.
* @param payload the payload, everything after the IP header and options.
* @param error_msg the error message (if error).
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int proto_socket_write(const string& if_name,
const string& vif_name,
const IPv4& src_address,
const IPv4& dst_address,
int32_t ip_ttl,
int32_t ip_tos,
bool ip_router_alert,
const vector<uint8_t>& payload,
string& error_msg);
/**
* Join an IPv4 multicast group.
*
* @param if_name the interface through which packets should be accepted.
* @param vif_name the vif through which packets should be accepted.
* @param group_address the multicast group address to join.
* @param receiver_name the name of the receiver.
* @param error_msg the error message (if error).
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int join_multicast_group(const string& if_name,
const string& vif_name,
const IPv4& group_address,
const string& receiver_name,
string& error_msg);
/**
* Leave an IPv4 multicast group.
*
* @param if_name the interface through which packets should not be
* accepted.
* @param vif_name the vif through which packets should not be accepted.
* @param group_address the multicast group address to leave.
* @param receiver_name the name of the receiver.
* @param error_msg the error message (if error).
* @return XORP_OK on success, otherwise XORP_ERROR.
*/
int leave_multicast_group(const string& if_name,
const string& vif_name,
const IPv4& group_address,
const string& receiver_name,
string& error_msg);
protected:
void process_recv_data(const string& if_name,
const string& vif_name,
const IPvX& src_address,
const IPvX& dst_address,
int32_t ip_ttl,
int32_t ip_tos,
bool ip_router_alert,
const vector<uint8_t>& ext_headers_type,
const vector<vector<uint8_t> >& ext_headers_payload,
const vector<uint8_t>& payload);
private:
FilterRawSocket4(const FilterRawSocket4&); // Not implemented.
FilterRawSocket4& operator=(const FilterRawSocket4&); // Not implemented.
protected:
list<InputFilter*> _filters;
typedef map<JoinedMulticastGroup, JoinedMulticastGroup> JoinedGroupsTable;
JoinedGroupsTable _joined_groups_table;
};
#endif // __FEA_RAWSOCK4_HH__
Generated by: pavlin on possum.icir.org on Wed Mar 21 11:23:22 2007, using kdoc $.
