RE: About Connection between PPP and linux Sockets

[Zhang, Zhenhua <zhenhua.zhang@intel.com>]

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Hi Steven,

Steven wrote:
> Hi Zhang,
> 
> Zhang, Zhenhua wrote:
>> Hi Steven,
>> 
>> Steven wrote:
>>> Hi Zhang
>>> Zhang, Zhenhua wrote:
>>>> Hi Marcel,
>>>> 
>>>> Marcel Holtmann wrote:
>>>>> Hi Steven,
>>>>> 
>>>>>> I have a little question just as the title said?
>>>>>> In Ofono how to connect PPP to Linux socket, when we receive
>>>>>> packet from network, how the packet go through the kernel to
>>>>>> application？ 
>>>>>> 
>>>>>> modem -->PPP-->? --> linux kernel(network part)--> socket -->
>>>>>> application?
>>>>> it is more like this:
>>>>> 
>>>>> modem -> TTY -> PPP -> TUN/TAP -> Kernel Net-Stack -> socket ->
>>>>> application. 
>>>>> 
>>>>> With the TTY being in kernel, the PPP being in userspace, and
>>>>> TUN/TAP etc. begin in the kernel again.
>>>>> 
>>>>> A future enhancement is to use the kernel PPP layer, but we
>>>>> haven't gotten there yet.
>>>> I am interested to know how could we use kernel PPP layer instead
>>>> of gatppp. Shall we add this item into our TODO?
>>>> 
>>> Maybe you can reference to RILD in Android, it used kernel PPP.
>> 
>> Thanks. Will take a look then.
> 
> This information is a good start point.
> http://www.devdiv.net/viewthread-26543
> 
> But only for Chinese people:(

Thanks. I have read this before. ;-). The original article is from maxleng's blog:

http://blog.csdn.net/maxleng/archive/2010/05/10/5576509.aspx

However, it's just a big picture about phone stack in Android. It said nothing about how Android works with kernel PPP layer.

> B.R
> 
> Steven
> 
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Regards,
Zhenhua