doc/examples/osmo-ggsn-kernel-gtp.cfg: new file

Add a copy of osmo-ggsn.cfg, with gtpu-mode set to kernel-gtp and apn
inet6 and inet46 removed (as the kernel module only supports ipv4).

Related: OS#3209
Change-Id: I6fbe8a8e55bad41532e9aed3cf71ebebffdcee52

contrib/osmo-ggsn.spec.in

@@ -108,6 +108,7 @@ make %{?_smp_mflags} check || (find . -name testsuite.log -exec cat {} +)
 %{_mandir}/man8/sgsnemu.8%{?ext_man}
 %{_unitdir}/%{name}.service
 %dir %{_docdir}/%{name}/examples
+%{_docdir}/%{name}/examples/osmo-ggsn-kernel-gtp.cfg
 %{_docdir}/%{name}/examples/osmo-ggsn.cfg
 %{_docdir}/%{name}/examples/sgsnemu.conf
 %dir %{_sysconfdir}/osmocom

debian/osmo-ggsn.examples

@@ -1,2 +1,3 @@
 doc/examples/osmo-ggsn.cfg
+doc/examples/osmo-ggsn-kernel-gtp.cfg
 doc/examples/sgsnemu.conf

doc/examples/Makefile.am

@@ -1,4 +1,5 @@
 OSMOCONF_FILES = \
+	osmo-ggsn-kernel-gtp.cfg \
 	osmo-ggsn.cfg \
 	sgsnemu.conf \
 	$(NULL)

doc/examples/osmo-ggsn-kernel-gtp.cfg

@@ -0,0 +1,51 @@
+!
+! OpenGGSN (0.94.1-adac) configuration saved from vty
+!!
+!
+log stderr
+ logging filter all 1
+ logging color 1
+ logging print category 0
+ logging timestamp 0
+ logging level ip info
+ logging level tun info
+ logging level ggsn info
+ logging level sgsn notice
+ logging level icmp6 notice
+ logging level lglobal notice
+ logging level llapd notice
+ logging level linp notice
+ logging level lmux notice
+ logging level lmi notice
+ logging level lmib notice
+ logging level lsms notice
+ logging level lctrl notice
+ logging level lgtp info
+ logging level lstats notice
+ logging level lgsup notice
+ logging level loap notice
+ logging level lss7 notice
+ logging level lsccp notice
+ logging level lsua notice
+ logging level lm3ua notice
+ logging level lmgcp notice
+!
+stats interval 5
+!
+line vty
+ no login
+!
+ggsn ggsn0
+ gtp state-dir /tmp
+ gtp bind-ip 127.0.0.2
+ apn internet
+  gtpu-mode kernel-gtp
+  tun-device tun4
+  type-support v4
+  ip prefix dynamic 172.16.222.0/24
+  ip dns 0 8.8.8.8
+  ip dns 1 8.8.4.4
+  ip ifconfig 172.16.222.0/24
+  no shutdown
+ default-apn internet
+ no shutdown ggsn