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Mikio Hara authored
ICMP extension structures allow a few existing ICMP error messages to convey extra information for troubleshooting; especially the root cause of why the original datagram could not be delivered. This CL adds generic support for ICMP extension stuructures to DstUnreach, TimeExceeded and ParamProb structs. Specific extensions such as MPLS label-stack, interface and next-hop identification will be inplemneted in separate followup CLs. Change-Id: I90798c135bdf76b806e2dde2bdd57c2c11d7e7e9
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