This patch series augmented the existing GTP module to support flow
based GTP tunneling and modified the openvswitch datapath to support the
GTP vport type.
A flow based GTP net device enables that,
1) on the RX path, the outer (IP/UDP/GTP) header information could to be
stored in the metadata_dst struct, and embedded into the skb.
2) on the TX path, packets are encapsulated following instructions in
the metadata_dst field of the skb.
A flow based GTP net device can be integrated with Open vSwitch, which
allows SDN controllers to program GTP tunnels via Open vSwitch.
Open vSwitch changes are based on patch set
[PATCH] Add GTP vport based on upstream datapath
Example usage with OVS:
ovs-vsctl add-port br0 gtp-vport -- set interface gtp-vport \
ofport_request=2 type=gtp option:remote_ip=flow options:key=flow
ovs-ofctl add-flow br0
"in_port=2,tun_src=192.168.60.141,tun_id=123, \
actions=set_field:02:00:00:00:00:00->eth_src, \
set_field:ff:ff:ff:ff:ff:ff->eth_dst,LOCAL"
ovs-ofctl add-flow br0 \
"in_port=LOCAL,actions=set_tunnel:888, \
set_field:192.168.60.141->tun_dst,2"
arp -s 10.1.1.122 02:00:00:00:00:00
Jiannan Ouyang (3):
gtp: refactor to support flow-based gtp encap and decap
gtp: Support creating flow-based gtp net_device
openvswitch: Add GPRS Tunnel Protocol (GTP) vport support
drivers/net/gtp.c | 375 ++++++++++++++++++++++++++++++++-------
include/net/gtp.h | 8 +
include/uapi/linux/openvswitch.h | 1 +
net/openvswitch/Kconfig | 10 ++
net/openvswitch/Makefile | 1 +
net/openvswitch/vport-gtp.c | 144 +++++++++++++++
6 files changed, 475 insertions(+), 64 deletions(-)
create mode 100644 net/openvswitch/vport-gtp.c
--
2.9.3
Hi,
I am currently working on building a GTP tunnel between two hosts. I used
two virtual machines to implement GTP tunnel. The machines have the kernel
4.8 since GTP is in mainline. (I just did 'modprobe gtp') I setup the
tunnel with libgtpnl tools.
What I would like to do is that I want to have GTP module in a kernel 3.18.
I did some google search and then I added the headers, libraries and the
source code to the source code of 3.18 to compile all the kernel, but it
didnt work. I am not experienced in kernel module programming or about the
consequences compiling GTP in previous kernels which have different
structural mechanisms than the 4.* versions.
Is there any way to achieve this? If so, how could it be possible to get
help from this community?
Thanks all,
Fırat
