Send packets from userspace program to kernel interface

[Bhaskar Upadhyayula]

Hi Nayan,

This isn't possible as the switch will be at customer site and ports
are high premium real estate. A software solution is required.

Thx.

On Tue, Aug 16, 2016 at 2:39 AM, Gadre Nayan <gadrenayan at gmail.com> wrote:
> If you have multiple ports on your system, you may connect a cable
> directly between two ports and send packets from one port and receive
> on another.
>
> On Tue, Aug 16, 2016 at 2:41 PM, Alan Liddell <alan.c.liddell at gmail.com> wrote:
>> Would sending the packet back out through the loopback address accomplish
>> what you're looking to do?
>>
>>
>> On Aug 16, 2016 7:51 AM, "Bhaskar Upadhyayula" <bu.kernel at gmail.com> wrote:
>>>
>>> Hello All,
>>>
>>> Summary:
>>> ===
>>> If a userspace program has a well crafted packet (ethernet or IPv4 or
>>> other protocol packet), is there a way for it to send the packet to
>>> kernel's network interface, simulating the behavior that the packet
>>> ingress'ed on that interface? Is this possible?
>>>
>>>
>>> Detailed Problem Description:
>>> ===
>>> I am working on packet sampling feature (sFlow) on OpenSwitch
>>> (www.openswitch.net) Network OS. Currently, this OS is supported on
>>> few Accton switches that has Broadcom's Trident2 chipset. When we
>>> enable packet sampling, the sampled packets are sent to a userspace
>>> program, by passing the kernel network stack. This is a problem if the
>>> packet was supposed to go up the network stack.
>>>
>>> I am investigating options to re-send the packet back to kernel
>>> interface on which packet arrived on the switch. Hence this question.
>>>
>>> A colleague suggested looking at Tuntap interfaces. I did a quick
>>> research and it did not appear that can be done.
>>>
>>> Any suggestions or pointers for further reading will be very helpful.
>>>
>>>
>>> Thanks.
>>>
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>>
>>
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