GSOC2025IcmpSocket: Difference between revisions

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* '''Mentors:''' Tommaso Pecorella and Alberto Gallegos Ramonet
* '''Mentors:''' Tommaso Pecorella and Alberto Gallegos Ramonet
* '''Google page:'''  
* '''Google page:'''  
* '''Project Goals: Develop an ICMP socket according to LINUX implementation of ICMP SOCK_DGRAM and SOCK_RAW'''  
* '''Project Goals: Develop an ICMP socket according to LINUX implementation of ICMP SOCK_DGRAM'''  
* '''Repository:'''  
* '''Repository:'''  
* '''About Me:'''  
* '''About Me:'''  


* '''Design Document:'''
Some highlights about the SOCK_DGRAM socket:
1. This is an L3 socket because ICMP is an L3 aspect, unlike UDP, TCP because it neither does it have any role in Transport functionality, nor does it do port-to-port mapping like previously mentioned L4 protocols.
2. The user can only send ECHO_REQUEST. The other types of packets cannot be sent.
3. The user may be notified only about ECHO_REPLY and ERRORS. For that, the user has to setRecvCallback and setErrorCallback (new).
setErrorCallback is a new function that is introduced for this specific socket. This will correctly mimic the error queue icmp socket. If wanted, setErrorCallback can be removed and we can have a single setRecvCallback and the user will have to check the packet received whether is it an error or not.
Let's see the ICMP v4 socket:
'''Now, let's go over the functions:'''
1. '''bind():''' Sets the local address of the socket. Just like other sockets.
2. '''connect()''': Sets the destination address for the packet. Again, just like other sockets.
3. '''close()''': Free up the socket. Just like other sockets.
4. '''send()''': The application will call this function to send packet. This is the function responsible for adding the icmp and then passing it to the ip protocol.
5. '''receive()''': It receives a packet. It then gets the type of packet: req, reply, ttl exceeded or dest unreach. It then calls the specific handler.
6. '''handle_echo_request()''': It creates an icmp echo reply with the same payload and sends it back to the sender. THIS PACKET IS NOT SENT UP TO THE APPLICATION.
7. '''handle_echo_reply()''': It sends the echo_reply up to the application. It calls the m_receivedCallback function, if set by the application using setRecvCallback.
8. '''handle_ttl_exceeded()''': It sends the ttl error up to the application. It calls the m_ErrorCallback function, if set by the user using setErrorCallback.
9. '''handle_dest_unreach()''': Just like handle_ttl_exceeded but for dest_unreach packet.
10. '''setRecvCallback, setErrorCallback''' will be used to set the m_receivedCallback and m_ErrorCallback respectively.


= Milestones =
= Milestones =

Revision as of 13:27, 30 August 2025

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Project Overview

  • Project Name: ICMP socket and generate/handle ICMP messages (host/net unreachable)
  • Student: Aditya Ruhela
  • Mentors: Tommaso Pecorella and Alberto Gallegos Ramonet
  • Google page:
  • Project Goals: Develop an ICMP socket according to LINUX implementation of ICMP SOCK_DGRAM
  • Repository:
  • About Me:


Milestones

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