[Nfd-dev] Drop a Nack packet for Data?

[Junxiao Shi]

Hi JeffT

ndn-cxx is designed for use with NFD. NFD never sends an LpPacket with Nack
field and Data in the fragment, so it's unnecessary for ndn-cxx to consider
this case.
ndn-cxx will have undefined behavior if the *local* NFD is misbehaving.

NFD, instead, is designed to connect with any NDN forwarder.
NFD correctly drops an LpPacket with Nack field and Data in the fragment.
https://github.com/named-data/NFD/blob/0de23a29c5c46d7134d03361244fb913159e750c/daemon/face/generic-link-service.cpp#L254-L258

Yours, Junxiao

On Mon, Apr 25, 2016 at 11:45 AM, Thompson, Jeff <jefft0 at remap.ucla.edu>
wrote:

> HI Junxiao,
>
> I’ve been studying the NDNLPv2 wiki page, to implement Nack in the CCL
> libraries. It says "When Nack appears on an LpPacket carrying a network
> layer packet other than an Interest, the packet MUST be dropped."
>
> It looks like ndn-cxx processes a Data packet normally, even if it was
> inside a Nack packet. Should the client library drop such a packet?
>
> https://github.com/named-data/ndn-cxx/blob/bb64c17b389c482cb1bfec5bbc2ba13064498560/src/face.cpp#L515
>
> Thanks,
> - Jeff T
>
>
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