On Wed, Sep 30, 2020 at 10:49:31AM +0100, Richard Haines wrote:

These patches came about after looking at 5G open source in particular
the updated 5G GTP driver at [1]. As this driver is still under
development, added the LSM/SELinux hooks to the current stable GTP
version in kernel selinux-next [2]. Similar hooks have also been
implemented in [1] as it uses the same base code as the current 3G
version (except that it handles different packet types).

Yes, [1] looks like it is based on the existing 3G driver in the Linux
tree.

To test the 3G GTP driver there is an RFC patch for the selinux-testsuite
at [3].

To enable the selinux-testsuite GTP tests, the libgtpnl [4] library and
tools needed to be modified to:
Return ERRNO on error to detect EACCES, Add gtp_match_tunnel function,
Allow gtp-link to specify port numbers for multiple instances to
run in the same namespace.

A patch for libgtpnl is supplied in the selinux-testsuite patch as well
as setup/test instructions (libgtpnl is not packaged by Fedora)

These patches were tested on Fedora 32 with kernel [2] using the
'targeted' policy. Also ran the Linux Kernel GTP-U basic tests [5].

I don't remember to have seen anything similar in the existing tunnel
net_devices.

Why do you need this?

[1] https://github.com/PrinzOwO/gtp5g