When genl_socket_open() succeeds but genl_lookup_family() fails,
we have to clean up the socket that we just opened.
This requires a new version of libgtpnl :/
Change-Id: I31df046530347f88cb7b16c37a899b456ed1b080
We have to factor out the "run once" code and make sure to really
only run that once, while the per-device code remains in the
gtp_kernel_init() function.
Change-Id: Iba5bd71e4b725eef59fe4f233fbb965e396a06c3
Whether or not GTP kernel support is enabled is the property of a
given APN, and not a global state variable.
Change-Id: Iff3bd8a52bd6c20f9811ee41ff700486d08591f3
The existing kernel GTP support code inherited from OpenGGSN was overly
simplistic and didn't support multiple GTP devices or user-defined GTP
device names. Let's remove that restriction in this patch
Change-Id: I51df223788fd5b7cf8099463b8aa0ca4a4fd1c96
Rather than taking an explicit in_addr, prefix_length and a
string-formatted prefix, let's pass in an in46_prefix and derive
the other representations from it.
Also, don't refer to a no-longer-existing global 'ipup' variable but
add it as a function argument.
Change-Id: Ife87142c86589b4fa4062d62afe3670467548589
Extend the IP pool implementation to be able to manage both pools
of 32bit addresses (IPv4) as well as pools of 128bit addresses (IPv6)
Change-Id: Ib98cc4bf634d6be9a7bf8c03a24e629455fcafc8
When Linux Kernel GTP-U support is enabled, OpenGGSN so far only worked
with GTPv0,but not with GTPv1, as the TEI values were not correctly
configured. This patch fixes the initialzation of the local and remote
TEI before using libgtpnl to create a tunnel context in the kernel.
Change-Id: I3e953ff5b4ab44c26dbbe20d18b61038fa57ff32
--gtpnl is now gone, instead you have --gtpkernel that behaves as an on/off
toggle. We full rely on the kernel routing base to select the real device to
transmit.
I have updated ggsn/cmdline.ggo and then run 'gengetopt' to refresh the
automatic code generation for command line options that openggsn uses.
This patch adds the -g, --gtpnl=device option that allows you to
enable the GTP kernel tunneling mode in openggsn. You have to specify
the real downlink device that will be used to tunnel traffic, eg.
-g=eth0
This means that the gtp0 device will be created and it will use eth0
as the real device to encapsulate packet coming from the Internet that
are addressed to the MS (so the tunnel devuce encapsulates these IP
packets in GTP packets when traveling to the SGSN).
Alternatively, you can also add this to the ggsn.conf configuration file:
gtpnl eth0
The device has to be the real device that can route packets to the SGSN,
if you select the wrong device, the kernel routing code may not find a
way to reach the SSGN, you've been warned.
Therefore, if this option is set, the operational becomes the following:
1) A gtp0 device is created via rtnetlink and configure the socket
encapsulation infrastructure in the kernel.
2) Whenever a PDP context is created, this adds the necessary tunnel
configuration via genetlink GTP interface.
3) Whenever a PDP context is destroyed, this deletes the tunnel via
genetlink GTP interface.
4) Destroy the gtp0 device if ggsn is stopped, including all of the
existing tunnels.
You require the osmo-ggsn.git tree, which contains the kernel module
gtp.ko and the libgtpnl library that you have to compile and install.
Make sure you have loaded the gtp.ko kernel module before launching
the ggsn daemon using the kernel driver mode, otherwise you will get
a nice "operation not supported" error message ;-).
This patch also adds supports for "ipup" configuration option to invoke
an external script after the gtp0 device has been brought up. Typical
command to add the route to reach the MS behind the GGSN is required,
eg. ip route add 10.0.0.0/8 dev gtp0.
The (horrible) ggsn parser has been manually extended to support the
new configuration option. That code doesn't look nice, but it just
mimics what we already have there for consistency, please don't blame
me for that.
If you want to run in debugging mode, I suggest you to use:
sudo ggsn -c ggsn.conf -f -d
Note that you do have to run openggsn as root to bring up the gtp0
device. You have to see this message that announce that the GTP kernel
mode is enabled.
openggsn[1106]: ggsn.c: 656: Using the GTP kernel mode (genl ID is 25)
This patch also automagically sets up route to reach MS from Internet
just like tun mode does. This is fundamental to get this working,
better don't leave to the admin, he may forget to add this route.
In this patch, I tried to encapsulate this new feature as much as
possible as Harald initially suggested.
To compile this feature, you have to pass --enable-gtp-kernel, ie.
./configire --enable-gtp-kernel
Otherwise, the code to interact with the gtp kernel part is not compiled.
Signed-off-by: Andreas Schultz <aschultz@tpip.net>
Harald Welte
Pablo Neira Ayuso