Project Lead: Luca Muscariello
Information-centric networking (ICN) is an approach to evolve the Internet infrastructure to directly support data-centric and location independent communications by introducing uniquely named data as a core Internet principle. Data access becomes independent from location, application and storage, enabling in-network caching and and anchor-less mobility. The expected benefits are improved efficiency, better scalability with respect to information/bandwidth demand and better robustness in challenging communication scenarios. These concepts are known under different terms, including but not limited to: Content-Centric Networking (CCN), Named Data Networking (NDN), the network of information (Netinf) and Publish/Subscribe Networking (PSIRP).
In this project the focus is on the Content-Centric Networking implementation (CCNx 1.0) that is under specification in a number of documents of the IRTF ICN research group , . The seminal papers describing the CCN architecture  and NDN  report in great detail the characteristics of the two systems. Differences among the two architectures, especially between CCNx 1.0 and NDN are minor and currently object of a converge effort at the IRTF . The current project scope is on CCNx 1.0 in view of the evolutions driven by the harmonization effort. The architecture evolution is community driven and the implementation would focus on the harmonization work made by the community as a whole. The project will also provide a number of applications that can be used by the community to demonstrate the concept as well as run experiments at scale to evaluate the advantages and benefits of the ICN concept in concrete use cases like video delivery across 5G networks.
The project scope includes CCN network architecture implementation: packet processing as well as networking socket API. Packet processing will be made available through two main forwarders one based on the VPP framework and one based on sockets to deploy CCN in non VPP environments. The project will focus on the CCNx 1.0 specification  as a reference implementation, but would evolve by keeping track of the work done in the convergence group at the IRTF . While the main focus is on the VPP plugin, the socket based forwarder will be used to enable end-to-end chains testing, supporting end devices that do not support VPP. Moreover, for the VPP forwarder, CCNx 1.0 packets will be transported using IPv4 encapsulation in the first place. This encapsulation will constitute the main focus for the VPP plugin while the socket-based forwarder could also support Ethernet encapsulation as an additional transport example.
In more detail, early releases would include:
- 1. A VPP forwarder plugin,
- 2. A socket-based forwarder,
- 3. The consumer/producer API,
- 4. A number of support libraries,
- 5. Examples of CCN applications, including but not limited to an end-to-end example for HTTP ABR video delivery (player and server),
- 6. Tools suitable to assist with development and testing.
The repository is organized in several orphaned branches (technically they have a common empty root), each one containing a sub-project. The naming convention naming branches is described in this document.
Branch naming conventions
Project cicn contains several sub-projects. Sub-project subp has a master branch with name origin/subp/master. All commits associated to sub-project subp will belong to the orphaned branch origin/subp. All branches associated to subp must be named as subp/branch-name.
Sub projects contained in the cicn git repository
Sub projects description
|Name||Description||Language and style|
|1. cicn-plugin||VPP forwarder||C GNU style|
|2. sb-forwarder||socket-based forwarder||C99 Google style|
|3. libicnet||socket API||C++11 Google style|
|4. cframework||C framework||C99 Google style|
|5. ccnxlibs||CCNx libraries||C99 Google style|
|6. http-server||HTTP server||C++11 Google style|
|7. viper||Qt/QML video player||C++/QML Qt style|
|8. vicn||vICN framework||python-3 and bash|
|9. android-sdk||Android SDK for ICN||cmake|
How to manage different master branches
It is suggested to clone each subproject branch in a different workspace to avoid error prone operations. The cicn git repo stores several projects which are independent one to another. While access control and isolation is guaranteed at a certain level by gerrit, using one single workspace is discouraged.
git clone -b cicn-plugin/master https://gerrit.fd.io/r/cicn cicn-plugin; git clone -b sb-forwarder/master https://gerrit.fd.io/r/cicn sb-forwarder; git clone -b libicnet/master https://gerrit.fd.io/r/cicn libicnet; git clone -b cframework/master https://gerrit.fd.io/r/cicn cframework; git clone -b ccnxlibs/master https://gerrit.fd.io/r/cicn ccnxlibs; git clone -b http-server/master https://gerrit.fd.io/r/cicn http-server; git clone -b viper/master https://gerrit.fd.io/r/cicn viper; git clone -b vicn/master https://gerrit.fd.io/r/cicn vicn; git clone -b android-sdk/master https://gerrit.fd.io/r/cicn android-sdk;
By having multiple sub-projects in the same repo, it is highly recommended to use the following approach while using branches and pushing patch sets.
$ subp = cicn-plugin $ coder = user $ git clone -b $subp/master ssh://$email@example.com:29418/cicn $subp; $ scp -p -P 29418 $firstname.lastname@example.org:hooks/commit-msg $subp/.git/hooks/;
If you use an email alias like email@example.com that is registered in the gerrit frontend it is recommended to set the following kind of configuration.
$ git config --local user.email "$coder +firstname.lastname@example.org" $ git config --local alias.push-for-review "push origin HEAD:refs/for/$subp/master"
This allows to avoid pushing for review to different sub-project branches using the command
$ git push-for-review
CICN committers will take care about code reviews before merging a patch set in the appropriate branch.
-  Marc Mosko et al. « CCNx Messages in TLV Format » https://tools.ietf.org/html/draft-irtf-icnrg-ccnxmessages-03.
-  Marc Mosko et al. « CCNx Semantics », https://tools.ietf.org/html/draft-irtf-icnrg-ccnxsemantics-03.
-  Van Jacobson et al. Networking Named Content, ACM SIGCOMM CoNexT 2009.
-  Van Jacobson et al. Named Data Networking, ACM SIGCOMM Computer Communications Review 2014.
-  CCN/NDN Convergence Effort at IRTF ICN Research Group https://trac.ietf.org/trac/irtf/wiki/icnrg/convergence
-  Information-Centric Networking Research Group (ICNRG) - https://trac.ietf.org/trac/irtf/wiki/icnrg
-  Named-Data Networking Project (NDN) - https://named-data.net
-  C. Westphal et al. RFC 7933 « Adaptive Video Streaming over Information-Centric Networking (ICN)» https://tools.ietf.org/html/rfc7933