Rare project developers

[mc36 <>]

hi,

so as stated during the vc, things are started but later abandoned...
i've following briefly the standards and when 5g came out it was a big win 
that they kept the gtp-u to create the overlay...
what we have now is a full dataplane support (tofnio, dpdk, software mode) 
for 3g, 4g, 5g, which are fully tested and interworks,
and a 3g control plane what needs to bumped to accept 4g and 5g tlvs and act 
upon them properly...

https://github.com/rare-freertr/freeRtr/blob/master/src/net/freertr/clnt/clntGtp.java
 is emulating an sgsn to have clients...
https://github.com/rare-freertr/freeRtr/blob/master/src/net/freertr/serv/servGtp.java
 is the ggsn part who handles them...
https://github.com/rare-freertr/freeRtr/blob/master/src/net/freertr/pack/packGtp.java
 is what needs to be bumped with the new tlvs...
https://github.com/rare-freertr/freeRtr/blob/master/src/net/freertr/serv/servP4langConn.java#L2780
 is where the tunnels are exported, good as is...
https://github.com/rare-freertr/freeRtr/blob/master/misc/p4bf/include/eg_ctl_nexthop.p4#L345
 is where the encap to tower happens in tofino, good as is...
https://github.com/rare-freertr/freeRtr/blob/master/misc/native/p4emu_fwd.h#L394
 the same but with dpdk, libpcap, udptap dataplanes...

we have several test cases covering all these one by one:

mc36@noti:~$ curl http://src.mchome.nop.hu/src/rtr.html| grep gtp
<tr><td><a 
href="http://sources.freertr.org/cfg/conn-gtp01.tst";>conn-gtp01.tst</a></td><td>success</td><td>ppp over 
gtp</td></tr>
<tr><td><a 
href="http://sources.freertr.org/cfg/conn-gtp02.tst";>conn-gtp02.tst</a></td><td>success</td><td>ipv4 
over gtp</td></tr>
<tr><td><a 
href="http://sources.freertr.org/cfg/conn-gtp03.tst";>conn-gtp03.tst</a></td><td>success</td><td>ipv6 
over gtp</td></tr>
<tr><td><a 
href="http://sources.freertr.org/cfg/conn-gtp04.tst";>conn-gtp04.tst</a></td><td>success</td><td>ipv4 and 
ipv6 over gtp</td></tr>
<tr><td><a 
href="http://sources.freertr.org/cfg/conn-gtp05.tst";>conn-gtp05.tst</a></td><td>success</td><td>gtp 
tunnel</td></tr>
<tr><td><a 
href="http://sources.freertr.org/cfg/p4lang-acl81.tst";>p4lang-acl81.tst</a></td><td>success</td><td>p4lang:
 ingress gtp access list</td></tr>
<tr><td><a 
href="http://sources.freertr.org/cfg/p4lang-acl82.tst";>p4lang-acl82.tst</a></td><td>success</td><td>p4lang:
 egress gtp access list</td></tr>
<tr><td><a 
href="http://sources.freertr.org/cfg/p4lang-rout186.tst";>p4lang-rout186.tst</a></td><td>success</td><td>p4lang:
 gtp server over ipv4</td></tr>
<tr><td><a 
href="http://sources.freertr.org/cfg/p4lang-rout187.tst";>p4lang-rout187.tst</a></td><td>success</td><td>p4lang:
 gtp server over ipv6</td></tr>
<tr><td><a 
href="http://sources.freertr.org/cfg/p4lang-rout188.tst";>p4lang-rout188.tst</a></td><td>success</td><td>p4lang:
 gtp server over ipv4 loopback</td></tr>
<tr><td><a 
href="http://sources.freertr.org/cfg/p4lang-rout189.tst";>p4lang-rout189.tst</a></td><td>success</td><td>p4lang:
 gtp server over ipv6 loopback</td></tr>
mc36@noti:~$

as frederic mentioned, you can run these on your notebook easily:

wget freertr.org/rtr.zip
unzip rtr.zip
cd src
./c.sh
./tw.sh conn-gtp01

then you can access your routers by
telnet localhost 20001
telnet localhost 20002

br,
cs