[ovs-dev] Editing Ip headers in datapath.c

[Sree Vidya S D]

Hi Jarno,

Actually Iam trying to implement source routing using IP headers.

I have rewritten the path in the ip header using actions from the
controller.

But I need to edit them in the switch as well ...

I cannot figure out the code segment for this

Could you please guide me??

On Tue, Mar 31, 2015 at 11:41 PM, Jarno Rajahalme <jrajahalme at nicira.com>
wrote:

>
> On Mar 30, 2015, at 10:19 PM, Sree Vidya S D <vidya426 at gmail.com> wrote:
>
> I am trying to edit the Ip source and destination address in
>
> void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
>
> in datapath.c file. I am able to edit mac headers successfully using
>
> memcpy(eth_hdr(skb), str, 2)
>
> // str contains my target data
>
> I tried a similar approach with Ip headers as well
>
> memcpy(ip_hdr(skb), str, 2)
>
> But it isnt giving the expected results, in fact the rewriting isnt getting
> executed.
>
> Could anyone please help me with the proper code segment to implement the
> above??
>
>
> You should not write to packet headers like that. Instead, you should set
> up a flow and use set field action to modify the packet headers. This might
> be a good place to start:
>
>
> https://www.opennetworking.org/images/stories/downloads/sdn-resources/onf-specifications/openflow/openflow-spec-v1.4.0.pdf
>
> Regards,
>
>   Jarno
>
>
> Thanks in advance!
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>
>
>


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*яєgαя∂ѕ, sreevidya*