[hipl-users] Re: HIPL and Network Interface

  • From: Lingyuan He <lingyuan.he@xxxxxxxxxxx>
  • To: "hipl-users@xxxxxxxxxxxxx" <hipl-users@xxxxxxxxxxxxx>
  • Date: Tue, 10 Mar 2015 17:24:25 -0400

Hi Miika,

Thank you for helping out from time to time.

Is there a place hipd keeps a list IP addresses? (And also storing preference?) 
Do you know which source file to look into? 

And what is hip association, is there a table for it? In hadb.c?

I am currently working on migrating previous modifications to OpenHIP in a 
project to HIPL, and obviously some term (hip association) and functionalities 
I mentioned come from their implementation. Any help would be greatly 
appreciated since it will shorten my time to dig into the code.


> On Mar 9, 2015, at 5:24 AM, Miika Komu <mkomu@xxxxxxxxx> wrote:
> Hi Lingyuan,
>> On 03/08/2015 02:26 AM, Lingyuan He wrote:
>> Hi,
>> I am currently studying the implementation of hipd, about how it uses
>> network interfaces, for the purpose of a research on network handover
>> (interface switching) in my university.
>> I have been looking into the implementation, but without too much
>> progress on my own.
>> My questions,
>> - where in the code that the daemon handles outbound connection and
>> pack/send a packets? Or simply put, where is the socket connection to
>> the other node created?
> 1. hipd is started and sets up a security policy matching to HIT prefix
> 2. application sends data to a HIT (or LSI)
> 3. IPsec intercepts the packet, notices that IPsec keys do not exist
> 4. IPsec sends a message to userspace key exchange daemons
> 5. hipd receives the message in netdev_handle_acquire()
>> - does hipd uses the default network interface without any consideration
>> of multiple network interfaces?
> by default, hipd uses the default route (i.e. source address) to send the 
> message. You can use the experimental "shotgun" extension to trigger flooding 
> of the I1 message through all source-destination address pairs. Hipd just 
> selects the address pair that responses first.
> http://infrahip.hiit.fi/hipl/manual/HOWTO.html#ch_shotgun
> Shotgun does not support yet mobility, just base exchange is supported. I can 
> give more information if you're interesting in contributing.
>> The end-result I am pursuing is to modify the implementation (if needed)
>> to insert a preferred network interface for hipl to use, in case there
>> are several.
>> Any insights would be greatly appreciated, thanks a lot in advance.

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