Reinjecting IP Packets

Reinjecting IP Packets

[Patrick Sodre Carlos]

Hi Guys,
   I'm trying to figure out what is the best way to reinject IP packets
into the stack. Does anyone have good/right/left ideas on this?

Thanks,
Patrick Sodre

Re: Reinjecting IP Packets

[Ben Greear]

Patrick Sodre Carlos wrote:
> Hi Guys,
>    I'm trying to figure out what is the best way to reinject IP packets
> into the stack. Does anyone have good/right/left ideas on this?

Maybe netif_rx() in net/core/dev.c ?

Ben



-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com

Re: Reinjecting IP Packets

[Patrick Sodre Carlos]

   My mistake... I forgot to mention that the packet will be coming from
user-space.

Patrick

On Fri, 2003-08-22 at 12:14, Ben Greear wrote:
> Patrick Sodre Carlos wrote:
> > Hi Guys,
> >    I'm trying to figure out what is the best way to reinject IP packets
> > into the stack. Does anyone have good/right/left ideas on this?
> 
> Maybe netif_rx() in net/core/dev.c ?
> 
> Ben
> 
> 

Re: Reinjecting IP Packets

[Ben Greear]

Patrick Sodre Carlos wrote:
>    My mistake... I forgot to mention that the packet will be coming from
> user-space.
> 
> Patrick

Maybe net_queue_xmit() then?

If not, you need to explain more where the pkt is coming from, and
where you want it re-injected into the stack.

Ben

> 
> On Fri, 2003-08-22 at 12:14, Ben Greear wrote:
> 
>>Patrick Sodre Carlos wrote:
>>
>>>Hi Guys,
>>>   I'm trying to figure out what is the best way to reinject IP packets
>>>into the stack. Does anyone have good/right/left ideas on this?
>>
>>Maybe netif_rx() in net/core/dev.c ?
>>
>>Ben
>>
>>
> 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
> 


-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com

Re: Reinjecting IP Packets

[Ben Greear]

Ben Greear wrote:
> Patrick Sodre Carlos wrote:
> 
>>    My mistake... I forgot to mention that the packet will be coming from
>> user-space.
>>
>> Patrick
> 
> 
> Maybe net_queue_xmit() then?
I meant dev_queue_xmit()

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com

Re: Reinjecting IP Packets

[Richard B. Johnson]

On Fri, 22 Aug 2003, Patrick Sodre Carlos wrote:

>
>    My mistake... I forgot to mention that the packet will be coming from
> user-space.
>
> Patrick

Then just use raw packets. Find the source of 'ping' and send
packets just like it does...

    ld->icp.net.icmp_id    = ld->ident;
    ld->icp.net.icmp_cksum = 0;
    ld->icp.net.icmp_cksum = chksum(&ld->icp, len);
    if(sendto(ld->s, &ld->icp, len, 0, &ld->where, sizeof(ld->where)) != len)
        perror("ping: sendto");
}


Cheers,
Dick Johnson
Penguin : Linux version 2.4.20 on an i686 machine (797.90 BogoMips).
            Note 96.31% of all statistics are fiction.

Re: Reinjecting IP Packets

[Parmer]

On Fri, 22 Aug 2003, Ben Greear wrote:

> Patrick Sodre Carlos wrote:
> > Hi Guys,
> >    I'm trying to figure out what is the best way to reinject IP packets
> > into the stack. Does anyone have good/right/left ideas on this?
>
> Maybe netif_rx() in net/core/dev.c ?

If you want an example of how this is done, look in /net/ipv4/ipip.c and
(I'm pretty sure) /net/ipv4/ip_gre.c.  I only know 2.4.*, but the files
still exist in 2.6, and they probably do it the same way.

Fairly elegant way to strip some headers and send it though again.

Hope that helps,
Gabe