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Andreas Schultz aschultz at tpip.netHi, ----- On Feb 16, 2017, at 11:08 PM, laforge laforge at gnumonks.org wrote: > Dear GTP-interested folks, > > I would love to somehow get towards some degree of unit testing (or even > "continuous integration") for teh kernel GTP code. > > We currently have the original code in the kernel, we had some recent > small fixes and now are getting more patches into place. With > relatively few active users out there (and probably none of them in > production yet), it's particularly easy to introduce regressions while > working on the code. Also, having tested new code even against a > test set with limited covrage could help to get more confidence in new > patches and thus get them merged sooner. We do run the current kernel code in production. The version I have been push patches for will be deployed into prod soonish. Automated testing is something we are also looking at. Currently, we have cooperation going on with a vendor of a an RAN and EPC protocol testing solution. The goal is to have a automated testing setup for our GGSN/PDN-GW OpenSource project. That setup will also exercise the kernel parts. The test suite is proprietary, so we can only share the results but not the test setup itself. > Using tools like sgsnemu of OpenGGSN and the command line tools included > in libgtpnl, it should be possibel to cook up some scripts for testing. > Even the most basic set of tests would be an improvement over what we > have now. One could also think about pcap replay to test with > hand-crafted or real-world packets from other GTP implementations. We more or less removed static GTP tunnels. The tools in libgtpnl only work when an application is keeping the GTP socket alive. Andreas > As much as I'd like to put something like this into place myself, I > don't think I will be able to work much on this in the near future. The > GTP module at this point is a pure hobby and contrary to some years ago > while I started it, I don't have any contract work in the GTP area at > this point, so other projects currently unfortunately get more > attention. > > So in case somebody among the GTP-interested parties (Travelping, OAI, > ...) would want to do something in terms of testing, I'd be more than > happy if somebody would step ahead. Otherwise it's all just vapourware > going to end up on my ever-growing TODO list :/ > > Also, if netdev folks have some ideas/pointers about possible > frameworks/tools for this kind of testing [it must exist for at least > some other kernel networking code?]: Please let me know. I'd be > interested to have a look if there's something that can be used as a > basis (starting network namespaces, sending/transmitting packets, test > case startup/teardown, ...) > > My "old school" approach would have been to start one or multiple > user-mode-linux kernels (those that are to be tested), and then have > scripts that set up a gtp socket and gtp tunnels via the libgtp command > line tools, and throw packets at that. But I'm sure there must be > quite powerful frameworks for that kind of testing in the 21st century? > How do other tunneling implementations handle this? > > Regards, > Harald > -- > - Harald Welte <laforge at gnumonks.org> http://laforge.gnumonks.org/ > ============================================================================ > "Privacy in residential applications is a desirable marketing option." > (ETSI EN 300 175-7 Ch. A6)