Raw Socket Data Receive

[bhargavram]

In T2080 Processor  with linux 4.20  unable to receive raw packets  sent from x86 PC using raw socket.  Same is working in linux-4.1.8 .

Kindly provide  solution how to make it work in linux 4.20

[bpe]

Please be aware, that NXP does not test every kernel release. For
your processor, we recommend staying with the most recent QorIQ
Yocto-based SDK release which is built around kernel version 4.14:

https://source.codeaurora.org/external/qoriq/qoriq-components/yocto-sdk

If you wish NXP to add SDK support to a custom kernel release, consider
our paid Professional Services:

https://www.nxp.com/support/support/nxp-professional-services:PROFESSIONAL-SERVICE

Have a great day,
Platon

[bhargavram]

Dear Platon,

Thanks for the reply.

Tested  raw socket with recent  yocto-based SDK release from the link shared by you.

https://source.codeaurora.org/external/qoriq/qoriq-components/yocto-sdk

And I am facing the same issue.

"Not able to receive raw packets from host pc(x86) sent using raw socket,

Always "net_ratelimit: x callbacks suppressed" is printed in my processor baord when i am trying to send raw packet from host PC"

Kindly provide solution.

Thanks and Regards ,

Bhargav.

[bpe]

How exactly you determine that the system fails to receive the packets?
What methods/APIs are you using to receive, and what is actually observed,
any errors returned or just nothing is received? Can you capture your
raw packets with tcpdump or socat running on the target?

[bhargavram]

Hi,

After debbuging found that, in linux  4.14 the raw packets are dropped because of header checksum error .So Updated the code by adding IP header checksum in the packet . Now it is working fine.

But in Linux 4.1.8 Header checksum error is not happening, can you provide the difference between linux 4.1.8 and 4.14 in receiving the  raw packet.

Regards,

M.Bhargav

[bpe]

I'm not sure what this is about. If a frame contains an IP header,
it must have a valid IP header chescksum. Otherwise, it will fail
to traverse the nearest IP gateway. Software that deliberately creates
a broken checksum header should not expect it to be received by any
kernel version.

Have a great day,
Platon

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[bhargavram]

Thanks for the reply.

Facing the same issue  with Kernel 4.14 from recent QorIQ Yocto-based SDK release

https://source.codeaurora.org/external/qoriq/qoriq-components/yocto-sdk

Kindly provide solution.