Simon Sundberg 8a8f538759 pping: Do both timestamping and matching on ingress and egress ...

Perform both timestamping and matching on both ingress and egress
hooks. This makes it more similar to Kathie's pping, allowing the tool
to capture RTTs in both directions when deployed on just a single
interface.

Like Kathie's pping, by default filter out RTTs for packets going to
the local machine (will only include local processing delays). This
behavior can be disabled by passing the -l/--include-local option.

As packets that are timestamped on ingress and matched on egress will
include the local machines processing delay, add the "match_on_egress"
member to the JSON output that can be used to differentiate between
RTTs that include the local processing delay, and those which don't.

Finally, report the source and destination addresses from the perspective
of the reply packet, rather than the timestamped packet, to be
consistent with Kathie's pping.

Overall, refactor large parts of pping_kern to allow both timestamping
and matching, as well as updating both the flow and reverse flow and
handle flow-events related to them, in one go. Also update README to
reflect changes.

Signed-off-by: Simon Sundberg <simon.sundberg@kau.se>

2022-02-10 16:16:24 +01:00

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