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Date: Wed, 12 Jul 2017 17:44:55 -0700
From: Jiannan Ouyang <ouyangj@...com>
To: <osmocom-net-gprs@...ts.osmocom.org>, <netdev@...r.kernel.org>,
<dev@...nvswitch.org>
CC: <pablo@...filter.org>, <laforge@...monks.org>,
<pshelar@...ira.com>, <wieger.ijntema.tno@...il.com>,
<yi.y.yang@...el.com>, <joe@....org>, <amarpadmanabhan@...com>,
Jiannan Ouyang <ouyangj@...com>
Subject: [PATCH net-next v1 3/3] openvswitch: Add GPRS Tunnel Protocol (GTP) vport support
Add OVS_VPORT_TYPE_GTP type and vport-gtp support.
Signed-off-by: Jiannan Ouyang <ouyangj@...com>
---
include/uapi/linux/openvswitch.h | 1 +
net/openvswitch/Kconfig | 10 +++
net/openvswitch/Makefile | 1 +
net/openvswitch/vport-gtp.c | 144 +++++++++++++++++++++++++++++++++++++++
4 files changed, 156 insertions(+)
create mode 100644 net/openvswitch/vport-gtp.c
diff --git a/include/uapi/linux/openvswitch.h b/include/uapi/linux/openvswitch.h
index 156ee4c..82b87b2 100644
--- a/include/uapi/linux/openvswitch.h
+++ b/include/uapi/linux/openvswitch.h
@@ -213,6 +213,7 @@ enum ovs_vport_type {
OVS_VPORT_TYPE_GRE, /* GRE tunnel. */
OVS_VPORT_TYPE_VXLAN, /* VXLAN tunnel. */
OVS_VPORT_TYPE_GENEVE, /* Geneve tunnel. */
+ OVS_VPORT_TYPE_GTP, /* GTP tunnel. */
__OVS_VPORT_TYPE_MAX
};
diff --git a/net/openvswitch/Kconfig b/net/openvswitch/Kconfig
index ce94729..d30d0ff 100644
--- a/net/openvswitch/Kconfig
+++ b/net/openvswitch/Kconfig
@@ -71,3 +71,13 @@ config OPENVSWITCH_GENEVE
If you say Y here, then the Open vSwitch will be able create geneve vport.
Say N to exclude this support and reduce the binary size.
+
+config OPENVSWITCH_GTP
+ tristate "Open vSwitch GTP tunneling support"
+ depends on OPENVSWITCH
+ depends on GTP
+ default OPENVSWITCH
+ ---help---
+ If you say Y here, then the Open vSwitch will be able create gtp vport.
+
+ Say N to exclude this support and reduce the binary size.
diff --git a/net/openvswitch/Makefile b/net/openvswitch/Makefile
index 60f8090..d77fcc0 100644
--- a/net/openvswitch/Makefile
+++ b/net/openvswitch/Makefile
@@ -22,3 +22,4 @@ endif
obj-$(CONFIG_OPENVSWITCH_VXLAN)+= vport-vxlan.o
obj-$(CONFIG_OPENVSWITCH_GENEVE)+= vport-geneve.o
obj-$(CONFIG_OPENVSWITCH_GRE) += vport-gre.o
+obj-$(CONFIG_OPENVSWITCH_GTP) += vport-gtp.o
diff --git a/net/openvswitch/vport-gtp.c b/net/openvswitch/vport-gtp.c
new file mode 100644
index 0000000..ed736ef
--- /dev/null
+++ b/net/openvswitch/vport-gtp.c
@@ -0,0 +1,144 @@
+/*
+ * Copyright (c) 2017 Facebook, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/net.h>
+#include <linux/rculist.h>
+#include <linux/udp.h>
+#include <linux/if_vlan.h>
+#include <linux/module.h>
+
+#include <net/gtp.h>
+#include <net/icmp.h>
+#include <net/ip.h>
+#include <net/route.h>
+#include <net/udp.h>
+#include <net/xfrm.h>
+
+#include "datapath.h"
+#include "vport.h"
+#include "vport-netdev.h"
+
+static struct vport_ops ovs_gtp_vport_ops;
+/**
+ * struct gtp_port - Keeps track of open UDP ports
+ * @dst_port: destination port.
+ */
+struct gtp_port {
+ u16 port_no;
+};
+
+static inline struct gtp_port *gtp_vport(const struct vport *vport)
+{
+ return vport_priv(vport);
+}
+
+static int gtp_get_options(const struct vport *vport,
+ struct sk_buff *skb)
+{
+ struct gtp_port *gtp_port = gtp_vport(vport);
+
+ if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, gtp_port->port_no))
+ return -EMSGSIZE;
+ return 0;
+}
+
+static struct vport *gtp_tnl_create(const struct vport_parms *parms)
+{
+ struct net *net = ovs_dp_get_net(parms->dp);
+ struct nlattr *options = parms->options;
+ struct gtp_port *gtp_port;
+ struct net_device *dev;
+ struct vport *vport;
+ struct nlattr *a;
+ u16 dst_port;
+ int err;
+
+ if (!options) {
+ err = -EINVAL;
+ goto error;
+ }
+
+ a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
+ if (a && nla_len(a) == sizeof(u16)) {
+ dst_port = nla_get_u16(a);
+ } else {
+ /* Require destination port from userspace. */
+ err = -EINVAL;
+ goto error;
+ }
+
+ vport = ovs_vport_alloc(sizeof(struct gtp_port),
+ &ovs_gtp_vport_ops, parms);
+ if (IS_ERR(vport))
+ return vport;
+
+ gtp_port = gtp_vport(vport);
+ gtp_port->port_no = dst_port;
+
+ rtnl_lock();
+ dev = gtp_create_flow_based_dev(net, parms->name,
+ NET_NAME_USER, dst_port);
+ if (IS_ERR(dev)) {
+ rtnl_unlock();
+ ovs_vport_free(vport);
+ return ERR_CAST(dev);
+ }
+
+ err = dev_change_flags(dev, dev->flags | IFF_UP);
+ if (err < 0) {
+ rtnl_delete_link(dev);
+ rtnl_unlock();
+ ovs_vport_free(vport);
+ goto error;
+ }
+
+ rtnl_unlock();
+ return vport;
+error:
+ return ERR_PTR(err);
+}
+
+static struct vport *gtp_create(const struct vport_parms *parms)
+{
+ struct vport *vport;
+
+ vport = gtp_tnl_create(parms);
+ if (IS_ERR(vport))
+ return vport;
+
+ return ovs_netdev_link(vport, parms->name);
+}
+
+static struct vport_ops ovs_gtp_vport_ops = {
+ .type = OVS_VPORT_TYPE_GTP,
+ .create = gtp_create,
+ .destroy = ovs_netdev_tunnel_destroy,
+ .get_options = gtp_get_options,
+ .send = dev_queue_xmit,
+};
+
+static int __init ovs_gtp_tnl_init(void)
+{
+ return ovs_vport_ops_register(&ovs_gtp_vport_ops);
+}
+late_initcall(ovs_gtp_tnl_init);
+
+static void __exit ovs_gtp_tnl_exit(void)
+{
+ ovs_vport_ops_unregister(&ovs_gtp_vport_ops);
+}
+module_exit(ovs_gtp_tnl_exit);
+
+MODULE_DESCRIPTION("OVS: GTP switching port");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("vport-type-6");
--
2.9.3
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