[dpdk-dev] ip_chksum not updated in ipsec-secgw application

[Akhil Goyal]

On 7/18/2016 6:27 PM, Sergio Gonzalez Monroy wrote:
> Hi,
>
> On 18/07/2016 13:41, Akhil Goyal wrote:
>> Hi,
>>
>> In Ipsec-secgw application, while adding the outer IP header, it seems
>> that the application does not update the checksum value for outbound
>> packets. This result in incorrect ip->checksum in the encrypted packet.
>>
>> Please let me know if the checksum value is updated somewhere else or
>> not.
>>
>> Also In case of inner ip header also the TTL value is decremented by
>> one but the checksum value is not updated. Is it intentional or it is
>> done somewhere else?
>
> It is intentional. The application is using IP checksum offload but just
> looking now at the code there is a bug for IPv6 packets where the flag
> does not get setup.
> Is it only for IPv6 traffic that you are having this issue?
>
> For IPv4 traffic the PKT_TX_IP_CKSUM flag is setup in 'prepare_tx_pkt'
> function in ipsec-secgw.c
>
> Sergio
>

Thanks Sergio, got your point. I missed the flag. I was using it for IPv4.

Akhil