The Changes Made to Dynamics and UDHCP

10.12.2007

Dynamo project group
Tero Hätinen, Joni Purojärvi and Antti Pyykkönen
University of Jyväskylä

The document presents the changes that Dynamo group made into Dynamics Mobile IPv4 and UDHCP system softwares to meet goals of the LaiLA project

1. Dynamics Home Agent Version 0.8.1

The functions, attributes and variables are presented in detail with Doxygen generated Dynamics DHCP Reference manual.

The purpose of the changes is to add DHCP support into the home agent.

UDHCP 0.9.8 files were copied into Home Agent directory.

To the file ha.h were added the following parts

• All necessary UDHCP defines were added to make UDHCP work and
• own defines RENEWIP, REQUESTIP and RELEASEIP which indicates the wanted DHCP call.


• A new UDHCP client_config struct was added.

• the whole UDHCP 0.9.8 client was added into home agent with
• UDHCP global variables,
• all UDHCP client functions and
• old main function of the client was renamed to udhcp.


• The new data structure dhcp_mobile_array was added with all the necessary data to be passed between UDHCP and the home agent.


• The new data structure handling functions add_dhcp_mobile, del_dhcp_mobile and find_dhcp_mobile were added.


• All old global variables were changed to be read from the data structure.


• To the handle_reg_msg function were added
• DHCPRELEASE call with udhcp when the mobile node disconnects,
• DHCPRENEW call with udhcp when the mobile node updates binding and
• DHCPDISCOVER call with udhcp when a new mobile node registers.


• The validate_request function was changed by removing the IP-address check because Home agent must approve IP-address 0.0.0.0.


• To the main function was addeddhcp_if variable to be set on UDHCP client_config data structure.

• A new variable dhcp_if into client_config data structure.

• To the process_load_ha function was added a new variable dhcp_if to be set from dynhad.conf file with name dhcp.

• A new line dhcp "eth2" to tell the what network interface DHCP uses.

• links to all included UDHCP files.

2. Dynamics Mobile Node Version 0.8.1

The functions, attributes and variables are presented in detail in Dynamo VFAG Reference manual generated with Doxygen. The test data is presented in the following order: time (in ascending order), function (0=leave, 1=join, 2=run third party program), home address, home agent address, care-off address and NAI. A test data example is presented in the file mobiles.txt.

The purpose of the changes is to translate the mobile node into a testing tool called "virtual foreign agent generator". The tool is used to test the behaviour of the home agent in stress situation.

New file mobiles.txt with test data

• ifr_name to u.name.

• main function to main_old.

• The new main program and
• call for mn_init before doing anything else in the main program.


• The new data structure were addded for "virtual mobile nodes" named as mobile_array and
• the new data structure were addded for file reading named as devices.

• All the old mobile node variables were changed to be read from mobile_array data structure.

• The file reading functions readfile and parse_rows were added.

• The virtual mobile node functions were added
• create_mobile to create virtual mobile nodes into mobile_array from test data file and
• send_messages to send registeration or deregisteration messages for virtual mobile nodes.

3. Modified Linux files

In our test enviroment (Ubuntu 6.10) we had to modify one Linux header file in order to get the program compiled.

• define ifnamsiz 16