isc::dhcp::PktFilterLPF Class Reference

Packet handling class using Linux Packet Filtering. More...

#include <pkt_filter_lpf.h>

Inheritance diagram for isc::dhcp::PktFilterLPF:

Public Member Functions
virtual bool	isDirectResponseSupported () const
	Check if packet can be sent to the host without address directly.
virtual bool	isSocketReceivedTimeSupported () const
	Check if the socket received time is supported.
virtual SocketInfo	openSocket (Iface &iface, const isc::asiolink::IOAddress &addr, const uint16_t port, const bool receive_bcast, const bool send_bcast)
	Open primary and fallback socket.
virtual Pkt4Ptr	receive (Iface &iface, const SocketInfo &socket_info)
	Receive packet over specified socket.
virtual int	send (const Iface &iface, uint16_t sockfd, const Pkt4Ptr &pkt)
	Send packet over specified socket.
Public Member Functions inherited from isc::dhcp::PktFilter
virtual	~PktFilter ()
	Virtual Destructor.
virtual bool	isDirectResponseSupported () const =0
	Check if packet can be sent to the host without address directly.
virtual bool	isSocketReceivedTimeSupported () const =0
	Check if the socket received time is supported.
virtual SocketInfo	openSocket (Iface &iface, const isc::asiolink::IOAddress &addr, const uint16_t port, const bool receive_bcast, const bool send_bcast)=0
	Open primary and fallback socket.
virtual Pkt4Ptr	receive (Iface &iface, const SocketInfo &socket_info)=0
	Receive packet over specified socket.
virtual int	send (const Iface &iface, uint16_t sockfd, const Pkt4Ptr &pkt)=0
	Send packet over specified socket.

Additional Inherited Members
Protected Member Functions inherited from isc::dhcp::PktFilter
virtual int	openFallbackSocket (const isc::asiolink::IOAddress &addr, const uint16_t port)
	Default implementation to open a fallback socket.

Detailed Description

Packet handling class using Linux Packet Filtering.

This class provides methods to send and receive DHCPv4 messages using raw sockets and Linux Packet Filtering. It is used by isc::dhcp::IfaceMgr to send DHCPv4 messages to the hosts which don't have an IPv4 address assigned yet.

Definition at line 23 of file pkt_filter_lpf.h.

Member Function Documentation

isDirectResponseSupported()

virtual bool isc::dhcp::PktFilterLPF::isDirectResponseSupported ( ) const

inlinevirtual

Check if packet can be sent to the host without address directly.

This class supports direct responses to the host without address.

Returns

true always.

Implements isc::dhcp::PktFilter.

Definition at line 31 of file pkt_filter_lpf.h.

isSocketReceivedTimeSupported()

bool isc::dhcp::PktFilterLPF::isSocketReceivedTimeSupported ( ) const

virtual

Check if the socket received time is supported.

If true, then packets received through this filter will include a SOCKET_RECEIVED event in its event stack.

Returns

True if SO_TIMESTAMP is defined.

Implements isc::dhcp::PktFilter.

Definition at line 132 of file pkt_filter_lpf.cc.

openSocket()

SocketInfo isc::dhcp::PktFilterLPF::openSocket ( Iface &  iface, const isc::asiolink::IOAddress &  addr, const uint16_t  port, const bool  receive_bcast, const bool  send_bcast  )

virtual

Open primary and fallback socket.

Parameters

iface	Interface descriptor.
addr	Address on the interface to be used to send packets.
port	Port number.
receive_bcast	Configure socket to receive broadcast messages
send_bcast	Configure socket to send broadcast messages.

Returns

A structure describing a primary and fallback socket.

Implements isc::dhcp::PktFilter.

Definition at line 141 of file pkt_filter_lpf.cc.

References isc::dhcp::Iface::getIndex(), isc::dhcp::Iface::getName(), isc_throw, isc::dhcp::PktFilter::openFallbackSocket(), isc::asiolink::IOAddress::toText(), and isc::asiolink::IOAddress::toUint32().

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receive()

Pkt4Ptr isc::dhcp::PktFilterLPF::receive ( Iface &  iface, const SocketInfo &  socket_info  )

virtual

Receive packet over specified socket.

Parameters

iface	interface
socket_info	structure holding socket information

Exceptions

isc::NotImplemented

always

Returns

Received packet

Implements isc::dhcp::PktFilter.

Definition at line 234 of file pkt_filter_lpf.cc.

References isc::dhcp::PktEvent::BUFFER_READ, isc::dhcp::decodeEthernetHeader(), isc::dhcp::decodeIpUdpHeader(), isc::dhcp::DHCPDISCOVER, isc::dhcp::SocketInfo::fallbackfd_, isc::dhcp::Iface::getIndex(), isc::util::InputBuffer::getLength(), isc::dhcp::Iface::getName(), isc::util::InputBuffer::getPosition(), isc_throw, isc::dhcp::IfaceMgr::RCVBUFSIZE, isc::util::InputBuffer::readVector(), isc::dhcp::PktEvent::SOCKET_RECEIVED, and isc::dhcp::SocketInfo::sockfd_.

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send()

int isc::dhcp::PktFilterLPF::send ( const Iface &  iface, uint16_t  sockfd, const Pkt4Ptr &  pkt  )

virtual

Send packet over specified socket.

Parameters

iface	interface to be used to send packet
sockfd	socket descriptor
pkt	packet to be sent

Exceptions

isc::NotImplemented

always

Returns

result of sending a packet. It is 0 if successful.

Implements isc::dhcp::PktFilter.

Definition at line 362 of file pkt_filter_lpf.cc.

References isc::util::OutputBuffer::getData(), isc::dhcp::Iface::getHWType(), isc::dhcp::Iface::getIndex(), isc::util::OutputBuffer::getLength(), isc::dhcp::Iface::getMac(), isc::dhcp::Iface::getMacLen(), isc_throw, isc::dhcp::PktEvent::RESPONSE_SENT, isc::util::OutputBuffer::writeData(), isc::dhcp::writeEthernetHeader(), and isc::dhcp::writeIpUdpHeader().

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The documentation for this class was generated from the following files:

• pkt_filter_lpf.h
• pkt_filter_lpf.cc