libgtp5gnl - netlink library for Linux kernel module 5G GTP-U

In order to control the kernel-side GTP-U plane, a netlink based control interface between GTP-C in userspace and GTP-U in kernelspace was invented.

The encoding and decoding of these control messages is implemented in the libgtp5gnl (library for GTP netlink).

libgtp5gnl is a project based on libgtpnl which is part of the Osmocom Open Source Mobile Communications project.

Note:1

The latest implementation of gtp5g and libgtp5gnl is in

https://github.com/free5gc/gtp5g

https://github.com/free5gc/libgtp5gnl

Usage

Compile

autoreconf -iv
./configure --prefix=`pwd`
make

Command

Sample command is written under script/ and tools/gtp5g-tunnel.c.

Show Current Rules

sudo ./tools/gtp5g-tunnel list pdr
sudo ./tools/gtp5g-tunnel list far

Test

Simple Test (RAN + UPF)

./run.sh SimpleUPTest

ULCL Test (RAN + I-UPF + A-UPF)

./run.sh ULCLTest1

Change Log

v0.2.0

• Changed to host type between gtp5g and libgtp5gnl
• Supported forwarding policy feature, but need to set ip rule and ip route with Linux mark by self
• Fixed bugs about "any" and "assigned" in SDF filter
• Fixed bugs about netmask translation between gtp5g and libgtp5gnl in SDF filter

v0.1.0

• First version
• Supported packet matching about UE IP, TEID and SDF filter