TCPOverIPv4Adapter Class Reference

A converter from TCP segments to serialized IPv4 datagrams. More...

#include <tcp_over_ip.hh>

Inheritance diagram for TCPOverIPv4Adapter:

Public Member Functions
std::optional< TCPSegment >	unwrap_tcp_in_ip (const InternetDatagram &ip_dgram)
InternetDatagram	wrap_tcp_in_ip (TCPSegment &seg)
Public Member Functions inherited from FdAdapterBase
const FdAdapterConfig &	config () const
	Get the current configuration. More...
FdAdapterConfig &	config_mut ()
	Get the current configuration (mutable) More...
bool	listening () const
	Get the listening flag. More...
void	set_listening (const bool l)
	Set the listening flag. More...
void	tick (const size_t)
	Called periodically when time elapses. More...

Additional Inherited Members
Protected Member Functions inherited from FdAdapterBase
FdAdapterConfig &	config_mutable ()

Detailed Description

A converter from TCP segments to serialized IPv4 datagrams.

Definition at line 12 of file tcp_over_ip.hh.

Member Function Documentation

unwrap_tcp_in_ip()

optional< TCPSegment > TCPOverIPv4Adapter::unwrap_tcp_in_ip

(

const InternetDatagram &

ip_dgram

)

This function attempts to parse a TCP segment from the IP datagram's payload.

If this succeeds, it then checks that the received segment is related to the current connection. When a TCP connection has been established, this means checking that the source and destination ports in the TCP header are correct.

If the TCP connection is listening (i.e., TCPOverIPv4OverTunFdAdapter::_listen is true) and the TCP segment read from the wire includes a SYN, this function clears the _listen flag and records the source and destination addresses and port numbers from the TCP header; it uses this information to filter future reads.

Returns

a std::optional<TCPSegment> that is empty if the segment was invalid or unrelated

Definition at line 26 of file tcp_over_ip.cc.

wrap_tcp_in_ip()

InternetDatagram TCPOverIPv4Adapter::wrap_tcp_in_ip

(

TCPSegment &

seg

)

Takes a TCP segment, sets port numbers as necessary, and wraps it in an IPv4 datagram

Parameters

[in]

seg

is the TCP segment to convert

Definition at line 75 of file tcp_over_ip.cc.

---

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

• /home/cs144/sponge/libsponge/tcp_helpers/tcp_over_ip.hh
• /home/cs144/sponge/libsponge/tcp_helpers/tcp_over_ip.cc