* Hooking on L4 Level with process information
@ 2017-08-29 2:04 Ravish Kumar
2017-08-29 3:19 ` Stephen Hemminger
0 siblings, 1 reply; 3+ messages in thread
From: Ravish Kumar @ 2017-08-29 2:04 UTC (permalink / raw)
To: Networking
Hi,
I want to hook tcp/udp packets on L4 Layer and based on process
information , content want to deny or allow packets.
Netfilter provides pre/post Routing hooks but not sure that will be
right place so thought of asking whether my approach is right.
Also how i can get process information whether this packet is send by
this process.
Thoughts /source code reference would be appreciated.
Regards,
Ravish
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Hooking on L4 Level with process information
2017-08-29 2:04 Hooking on L4 Level with process information Ravish Kumar
@ 2017-08-29 3:19 ` Stephen Hemminger
2017-08-29 3:36 ` Ravish Kumar
0 siblings, 1 reply; 3+ messages in thread
From: Stephen Hemminger @ 2017-08-29 3:19 UTC (permalink / raw)
To: Ravish Kumar; +Cc: Networking
On Tue, 29 Aug 2017 07:34:51 +0530
Ravish Kumar <ravishk2004@gmail.com> wrote:
> Hi,
>
> I want to hook tcp/udp packets on L4 Layer and based on process
> information , content want to deny or allow packets.
>
> Netfilter provides pre/post Routing hooks but not sure that will be
> right place so thought of asking whether my approach is right.
> Also how i can get process information whether this packet is send by
> this process.
>
> Thoughts /source code reference would be appreciated.
>
> Regards,
> Ravish
There is not a 1:1 relationship between sockets/files and processes.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Hooking on L4 Level with process information
2017-08-29 3:19 ` Stephen Hemminger
@ 2017-08-29 3:36 ` Ravish Kumar
0 siblings, 0 replies; 3+ messages in thread
From: Ravish Kumar @ 2017-08-29 3:36 UTC (permalink / raw)
To: Stephen Hemminger; +Cc: Networking
Not convinced with this .
A process open a socket and that socket is associated with that
particular process unless it shares the file descriptors.
Can you explain why it is not related , at a time a socket will be
opened by a particular process.
On Tue, Aug 29, 2017 at 8:49 AM, Stephen Hemminger
<stephen@networkplumber.org> wrote:
> On Tue, 29 Aug 2017 07:34:51 +0530
> Ravish Kumar <ravishk2004@gmail.com> wrote:
>
>> Hi,
>>
>> I want to hook tcp/udp packets on L4 Layer and based on process
>> information , content want to deny or allow packets.
>>
>> Netfilter provides pre/post Routing hooks but not sure that will be
>> right place so thought of asking whether my approach is right.
>> Also how i can get process information whether this packet is send by
>> this process.
>>
>> Thoughts /source code reference would be appreciated.
>>
>> Regards,
>> Ravish
>
> There is not a 1:1 relationship between sockets/files and processes.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2017-08-29 3:36 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2017-08-29 2:04 Hooking on L4 Level with process information Ravish Kumar
2017-08-29 3:19 ` Stephen Hemminger
2017-08-29 3:36 ` Ravish Kumar
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.