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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