feat: boostrap hicn 22.02

The current patch provides several new features, improvements,
bug fixes and also complete rewrite of entire components.

- lib
The hicn packet parser has been improved with a new packet
format fully based on UDP. The TCP header is still temporarily
supported but the UDP header will replace completely the new hicn
packet format. Improvements have been made to make sure every
packet parsing operation is made via this library. The current
new header can be used as header between the payload and the
UDP header or as trailer in the UDP surplus area to be tested
when UDP options will start to be used.

- hicn-light
The portable packet forwarder has been completely rewritten from
scratch with the twofold objective to improve performance and
code size but  also to drop dependencies such as libparc which is
now removed by the current implementation.

- hicn control
the control library is the agent that is used to program the
packet forwarders via their binary API. This component has
benefited from significant improvements in terms of interaction
model which is now event driven and more robust to failures.

- VPP plugin has been updated to support VPP 22.02

- transport
Major improvement have been made to the RTC protocol, to the
support of IO modules and to the security sub system. Signed
manifests are the default data authenticity and integrity framework.
Confidentiality can be enabled by sharing the encryption key to the
prod/cons layer. The library has been tested with group key based
applications such as broadcast/multicast and real-time on-line
meetings with trusted server keys or MLS.

- testing
Unit testing has been introduced using GoogleTest. One third of
the code base is covered by unit testing with priority on
critical features. Functional testing has also been introduce
using Docker, linux bridging and Robot Framework to define
test with Less Code techniques to facilitate the extension
of the coverage.

Co-authored-by: Mauro Sardara <msardara@cisco.com>
Co-authored-by: Jordan Augé <jordan.auge+fdio@cisco.com>
Co-authored-by: Michele Papalini <micpapal@cisco.com>
Co-authored-by: Angelo Mantellini <manangel@cisco.com>
Co-authored-by: Jacques Samain <jsamain@cisco.com>
Co-authored-by: Olivier Roques <oroques+fdio@cisco.com>
Co-authored-by: Enrico Loparco <eloparco@cisco.com>
Co-authored-by: Giulio Grassi <gigrassi@cisco.com>

Change-Id: I75d0ef70f86d921e3ef503c99271216ff583c215
Signed-off-by: Luca Muscariello <muscariello@ieee.org>
Signed-off-by: Mauro Sardara <msardara@cisco.com>

1 files changed, 23 insertions, 9 deletions

diff --git a/libtransport/src/protocols/rtc/probe_handler.h b/libtransport/src/protocols/rtc/probe_handler.h
index e34b23df0..2de908176 100644
--- a/libtransport/src/protocols/rtc/probe_handler.h
+++ b/libtransport/src/protocols/rtc/probe_handler.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2021 Cisco and/or its affiliates.
+ * Copyright (c) 2021 Cisco and/or its affiliates.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
@@ -26,6 +26,12 @@ namespace protocol {
 
 namespace rtc {
 
+enum class ProbeType {
+  NOT_PROBE,
+  INIT,
+  RTT,
+};
+
 class ProbeHandler : public std::enable_shared_from_this<ProbeHandler> {
  public:
   using SendProbeCallback = std::function<void(uint32_t)>;
@@ -35,31 +41,39 @@ class ProbeHandler : public std::enable_shared_from_this<ProbeHandler> {
 
   ~ProbeHandler();
 
-  // if the function returns 0 the probe is not valaid
+  // If the function returns 0 the probe is not valid.
   uint64_t getRtt(uint32_t seq);
 
-  // reset the probes parameters. it stop the current probing.
-  // to restar call sendProbes.
-  // probe_interval = 0 means that no event will be scheduled
-  // max_probe = 0 means no limit to the number of probe to send
+  // this function may return a residual loss rate higher than the real one if
+  // we don't wait enough time for the probes to come back
+  double getProbeLossRate();
+
+  // Set the probe suffix range [min, max]
+  void setSuffixRange(uint32_t min, uint32_t max);
+
+  // Reset the probes parameters and stops the current probing.
+  // probe_interval = 0 means that no event will be scheduled.
+  // max_probe = 0 means no limit to the number of probe to send.
   void setProbes(uint32_t probe_interval, uint32_t max_probes);
 
-  // stop to schedule probes
   void stopProbes();
 
   void sendProbes();
 
+  static ProbeType getProbeType(uint32_t seq);
+
  private:
   uint32_t probe_interval_;  // us
   uint32_t max_probes_;      // packets
   uint32_t sent_probes_;     // packets
+  uint32_t recv_probes_;     // packets
 
   std::unique_ptr<asio::steady_timer> probe_timer_;
 
-  // map from seqnumber to timestamp
+  // Map from packet suffixes to timestamp
   std::unordered_map<uint32_t, uint64_t> pending_probes_;
 
-  // random generator
+  // Random generator
   std::default_random_engine rand_eng_;
   std::uniform_int_distribution<uint32_t> distr_;