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Pablo Neira Ayuso pablo at netfilter.orgOn Tue, May 10, 2016 at 10:16:33AM -0700, Tom Herbert wrote: > On Tue, May 10, 2016 at 9:27 AM, David Miller <davem at davemloft.net> wrote: > > From: Pablo Neira Ayuso <pablo at netfilter.org> > > Date: Mon, 9 May 2016 00:55:48 +0200 > > > >> This is an initial implementation of a netdev driver for GTP datapath > >> (GTP-U) v0 and v1, according to the GSM TS 09.60 and 3GPP TS 29.060 > >> standards. This tunneling protocol is used to prevent subscribers from > >> accessing mobile carrier core network infrastructure. > >> > >> This implementation requires a GGSN userspace daemon that implements the > >> signaling protocol (GTP-C), such as OpenGGSN [1]. This userspace daemon > >> updates the PDP context database that represents active subscriber > >> sessions through a genetlink interface. > >> > >> For more context on this tunneling protocol, you can check the slides > >> that were presented during the NetDev 1.1 [2]. > >> > >> Only IPv4 is supported at this time. > >> > > Is there a timeline for adding IPv6 support? There is a preliminary kernel patch to add IPv6 that seems to be untested yet, I can share it with you or anyone else want to have a look. Specifically, there are missing bits on the netlink side of the PDP context database to support SGSN and MS IPv6 address, but that shouldn't be much of a problem. On the userspace side, the userspace daemon OpenGGSN still doesn't support IPv6. Adding IPv6 support to this daemon is a bit of a PITA, several people using it in production told me that the daemon runs stable for production, but from a developer perspective the current codebase look not easy to extend (quite many stuff very IPv4 specific, I already spend time trying to refactor it two years ago to prepare this support). Meanwhile, this triggered a new daemon daemon implementation osmo-ggsn to replace it, I posted a proof-of-concept on the openbsc mailing list, but nobody jumped on this to support this development effort so far.