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Reinjecting IP Packets

DISCUSSION Patrick Sodre Carlos 4 participants 7 messages Aug 22, 2003

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Patrick Sodre Carlos

author
#0 lore raw

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

#1 lore raw
Quoted 3 lines · 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?

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

Ben

Signature · 2 lines
Ben Greear <[email protected]>
Candela Technologies Inc  http://www.candelatech.com
author
#2 lore raw

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

Patrick

Quoted 10 lines · Ben Greear
Quoted 3 lines · 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?

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

Ben

#3 lore raw
Quoted 5 lines · Patrick Sodre Carlos

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.

#4 lore raw
In reply to Patrick Sodre Carlos
Quoted 4 lines · Patrick Sodre Carlos

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

Quoted 21 lines · Ben Greear
Quoted 12 lines
Quoted 3 lines · 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?

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

Ben

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Signature · 2 lines
Ben Greear <[email protected]>
Candela Technologies Inc  http://www.candelatech.com
#5 lore raw
Quoted 9 lines · Ben Greear
Quoted 4 lines · Patrick Sodre Carlos

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()

Signature · 2 lines
Ben Greear <[email protected]>
Candela Technologies Inc  http://www.candelatech.com
#6 lore raw
In reply to Ben Greear
Quoted 6 lines · Ben Greear
Quoted 3 lines · 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?

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