U6ID Principal

[Daivik Dave]

Hello , 

        I have started working on U6ID principal . Can i use 0x1b for U6ID principal type , If it is not allocated to any other principal ?

Regards

Daivik

[Michel Machado]

Hi Daivik,

I just allocated 0x1b for U6ID for you. Thank you for requesting it. Just for reference, we keep all constants used in XIA on the following page: https://github.com/AltraMayor/XIA-for-Linux/wiki/Constants-used-in-XIA . 

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[Daivik Dave]

Hello,

             I have a doubt , is struct fib_xid_u4id_local have one instance on a machine or it has instances corresponding to each entry in the local table , also there is a socket in the context and also in the local u4id struct , do these sockets have different purposes (i have some confusion here.)

Thanks 

Daivik

[Michel Machado]

There is an instance of struct fib_xid_u4id_local for each entry in the local table.

Each local entry has a listening socket, so the TCP/IP stack receives the packet and passes it to the XIA stack.

The socket is the context is the socket XIA uses to transmit packets over TCP/IP.

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[Daivik Dave]

Hello,

               I am getting a no space error "Can't obtain a virtual XID type."  , Is this because  of the constant XIP_MAX_XID_TYPES set to 8 , exactly 8 xia principals are loaded in my OS . If this is the case , do i need to compile the kernel again ,if i increase it to 9?

    Thanks,

     Daivik

 

[Michel Machado]

Try another free id for U6ID instead of 0x1b until it works. The pull request #16 is meant to solve this problem, but it's in our backlog. We'll try to clear this pull request before you are ready to merge your work.

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[Daivik Dave]

Hello,

         Is there any reference material i can use for IPv6 version of handle_skb_to ipv4 function?

Thanks

Daivik

[Michel Machado]

I know it doesn't sound motivating, but the only reference material I'm aware of is the code of the kernel. Not only the XIA part, but the kernel itself is full of potential examples.

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[Daivik Dave]

Hello ,

         I have been trying to replicate the u4id experiment for u6id , and there are some problems .

1) The default IPv6 address assigned to eth0 interface is a Link local address and it cannot be used to bind to a socket .    

    2) The ip address assigned through ip add addr command gets successfully added to the interface and also gets added to a new route in the principal , but is not recognised by other containers . 

   3) I tried some commands specified in https://www.linux.com/learn/another-ipv6-crash-course-linux-real-ipv6-addresses-routing-name-services , an image attached to demonstrate the commands, But i am unable to ping between containers.

  

What should i do to assign Ipv6 address to the host and the containers in the star topology , so that the Ipv6 address are global and the containers are able to ping each other ?

Thanks 

Daivik

[Michel Machado]

1. Manually assign an IPv6 address and use it in the experiment.

2. It reads as you haven't made sure that the routing tables of the containers have been updated to reflect the new address. If you have updated the routing tables of the containers, look for small mistakes in them. We had a small mistake in the routing tables of the exemplifying demo (https://github.com/AltraMayor/XIA-for-Linux/wiki/An-exemplifying-demo) when we were building that experiment that took us quite some time to figure out.

3. The fact that you can't ping between the containers increases the chances of what I said in item 2 to be the root cause.

You need to set pairs of IPv6 addresses that are set up as local addresses between the central host and an outter point of the star. Like the IPv4 experiment does: 10.0.1.1 and 10.0.1.2, 10.0.2.1 and 10.0.2.2.

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[Daivik Dave]

Hello ,
        By assigning manual IPv6 addresses and routes on the host , The U6ID principal is now working . This is the link( https://drive.google.com/file/d/1KPirU-IrkbsZXxdkJyl71SA9nkpvmVgs/view?usp=sharing ) of the video demonstrating the U6ID principal . Currently Saurav Kumar is reviewing my code , and will submit pull request when the review and changes are complete .

Thanks
Daivik

[Michel Machado]

Congrats on getting the U6ID principal working, Daivik.

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