[Chilli] Exclude up/down traffic from "quota" if in walled garden

[David Bird]

Look in the garden.c file for the walled garden routines. From what you explained, I think you are on the right track. 

--
  David Bird
  Coova Technologies, LLC

On Jun 13, 2011, at 11:54 AM, Tim White <timwhite88 at gmail.com> wrote:

> I wrote a patch a long time ago to exclude traffic to a from the local coovachilli server from the "quota" counting. It basically matches for port 80 on the uamlisten at the same time that we already check for uamport and uamuiport. My reasoning was that I wanted to use a different webserver for the captive portal, that also hosts a local mirror.  It can be seen at http://grase.bzr.sf.net/bzr/grase/grase-coova-chilli/annotate/head%3A/debian/patches/ignore_localhttp.diff
> 
> What I'm hoping to try and do is extend this so that we can exclude all traffic from the walled garden hosts so that I can allow access to some local mirrors that are on the other side of the coovachilli machine, without it counting against the quota.
> 
> Currently both my modifications are in the cb_tun_ind function. I understand that my modifications would need to be moved into it's own area (as currently the second one actually forces the packet through the tun/tap interface due to me piggybacking on other code.
> 
> If I understand the code correctly, the functions I need to bypass are chilli_acct_fromsub and chilli_acct_tosub. Both those functions only modify the accounting data, and don't modify the packet path. Please correct me if I'm wrong.
> 
> So for example, before the chilli_acct_fromsub call I'd put an if statement to call a funky function to check if the daddr is in the uam list and if so, then call the tun_encaps function otherwise allow the chilli_acct_fromsub to call.
> Can someone point me to where I can get access to the list of uamdomains/address, and functions that already compare to the list? C hasn't been my main language for a good number of years and I'm having trouble finding things in the rather large chilli.c file.
> 
> Also, if I'm trying to put these functions in the wrong area, i.e. me bypassing chilli_acct_fromsub, and it's going to cause serious problems somewhere, please tell me!
> 
> I hope this won't work out too difficult, and that I can code it well enough that it can be come a feature.
> 
> Thanks
> 
> Tim
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