Hi Vijay, I’d advise you to create a new fixup function (c.f. gre44_fixup) that deals with the extra headers you want.
/neale From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> on behalf of Vijay Kumar via lists.fd.io <vjkumar2003=gmail....@lists.fd.io> Date: Tuesday, 25 May 2021 at 14:07 To: vpp-dev <vpp-dev@lists.fd.io> Subject: [vpp-dev] Regarding vnet/gre Hi, I have a requirement to add extension fields (like QFI, RQI) into the GRE packet header leaving the VPP. Upon analyzing the packet trace, I found that gre4_input graph node is called whenever GRE packets enter VPP but for outgoing packets, the GRE header is added by the tunnel's mid-chain adjacencies. There is no GRE graph node specifically for adding outgoing GRE header. Is it a good idea to add code changes in the adj-midchain-tx node for adding new fields related to outgoing GRE packets? Pls advise. Thanks. Vijay.
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