[PATCH 2/2] nitb: Add a mode to not use TMSI for normal operation

[Ciaby]

On 07/14/2015 01:32 PM, Holger Hans Peter Freyther wrote:
> From: Holger Hans Peter Freyther <holger at moiji-mobile.com>
> 
> In case foreign simcards are used we can not do authentication
> and ciphering. In case a TMSI is re-used too early and we do
> page using TMSI we can't know which of the two MS is responding
> to us. We could change the "secure channel" routine to ask for
> the IMSI and only then stop the paging.
> 
> As we don't have ciphering there is not much use in using the
> TMSI. Add a mode "no assign-tmsi" that will not assign the TMSI
> during LU. Now CM Service Request and Paging Response  will
> work using the IMSI. There can't be a clash with that.
[...]
>  static int config_write_nitb(struct vty *vty)
>  {
>  	struct gsm_network *gsmnet = gsmnet_from_vty(vty);
>  	vty_out(vty, "nitb%s", VTY_NEWLINE);
>  	vty_out(vty, " %ssubscriber-create-on-demand%s",
>  		gsmnet->create_subscriber ? "" : "no ", VTY_NEWLINE);
> +	vty_out(vty, " %suse-tmsi%s",
> +		gsmnet->avoid_tmsi ? "no" : "", VTY_NEWLINE);
>  	return CMD_SUCCESS;
>  }
This part is broken. Whenever you try to set it it will put "use-tmsi"
instead of "assign-tmsi". The moment you save it and restart, it barfs
on the "use-tmsi" line. If you put a no in front, it will be saved as
"nouse-tmsi". I fixed both problems with the attached patch.
Cheers

Ciaby


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