[ovs-dev] [PATCH v1 1/2] datapath: add vport-gtp for GPRS Tunneling Protocol
Jiannan Ouyang
ouyangj at fb.com
Thu Jul 13 00:45:42 UTC 2017
Add vport-gtp which uses gtp_create_flow_based_dev exported by the Linux GTP
module to create a flow based net_device
Signed-off-by: Jiannan Ouyang <ouyangj at fb.com>
---
datapath/Modules.mk | 2 +
datapath/linux/Modules.mk | 1 +
datapath/linux/compat/include/linux/openvswitch.h | 1 +
datapath/linux/compat/include/net/gtp.h | 35 ++++++
datapath/vport-gtp.c | 146 ++++++++++++++++++++++
5 files changed, 185 insertions(+)
create mode 100644 datapath/linux/compat/include/net/gtp.h
create mode 100644 datapath/vport-gtp.c
diff --git a/datapath/Modules.mk b/datapath/Modules.mk
index 21f04a0..771758d 100644
--- a/datapath/Modules.mk
+++ b/datapath/Modules.mk
@@ -8,6 +8,7 @@ both_modules = \
$(build_multi_modules) \
vport_geneve \
vport_gre \
+ vport_gtp \
vport_lisp \
vport_stt \
vport_vxlan
@@ -31,6 +32,7 @@ openvswitch_sources = \
vport_geneve_sources = vport-geneve.c
vport_vxlan_sources = vport-vxlan.c
vport_gre_sources = vport-gre.c
+vport_gtp_sources = vport-gtp.c
vport_lisp_sources = vport-lisp.c
vport_stt_sources = vport-stt.c
diff --git a/datapath/linux/Modules.mk b/datapath/linux/Modules.mk
index 985ffed..f9a4ad5 100644
--- a/datapath/linux/Modules.mk
+++ b/datapath/linux/Modules.mk
@@ -71,6 +71,7 @@ openvswitch_headers += \
linux/compat/include/net/genetlink.h \
linux/compat/include/net/geneve.h \
linux/compat/include/net/gre.h \
+ linux/compat/include/net/gtp.h \
linux/compat/include/net/inet_ecn.h \
linux/compat/include/net/inet_frag.h \
linux/compat/include/net/inetpeer.h \
diff --git a/datapath/linux/compat/include/linux/openvswitch.h b/datapath/linux/compat/include/linux/openvswitch.h
index 91d3140..9a891d3 100644
--- a/datapath/linux/compat/include/linux/openvswitch.h
+++ b/datapath/linux/compat/include/linux/openvswitch.h
@@ -236,6 +236,7 @@ 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_LISP = 105, /* LISP tunnel */
OVS_VPORT_TYPE_STT = 106, /* STT tunnel */
__OVS_VPORT_TYPE_MAX
diff --git a/datapath/linux/compat/include/net/gtp.h b/datapath/linux/compat/include/net/gtp.h
new file mode 100644
index 0000000..d76b03a
--- /dev/null
+++ b/datapath/linux/compat/include/net/gtp.h
@@ -0,0 +1,35 @@
+#ifndef __NET_GTP_WRAPPER_H
+#define __NET_GTP_WRAPPER_H 1
+
+#ifdef CONFIG_INET
+#include <net/udp_tunnel.h>
+#endif /* ifdef CONFIG_INET */
+
+#ifdef USE_UPSTREAM_TUNNEL
+#include_next <net/gtp.h>
+
+static inline int rpl_gtp_init_module(void)
+{
+ return 0;
+}
+static inline void rpl_gtp_cleanup_module(void)
+{}
+
+#define gtp_xmit dev_queue_xmit
+
+#ifdef CONFIG_INET
+#ifndef HAVE_NAME_ASSIGN_TYPE
+static inline struct net_device *rpl_gtp_dev_create_fb(
+ struct net *net, const char *name, u8 name_assign_type, u16 dst_port) {
+ return gtp_dev_create_fb(net, name, dst_port);
+}
+#define gtp_create_flow_based_dev rpl_gtp_dev_create_fb
+#endif
+#endif
+
+#endif /* USE_UPSTREAM_TUNNEL */
+
+#define gtp_init_module rpl_gtp_init_module
+#define gtp_cleanup_module rpl_gtp_cleanup_module
+
+#endif /* __NET_GTP_WRAPPER_H */
diff --git a/datapath/vport-gtp.c b/datapath/vport-gtp.c
new file mode 100644
index 0000000..cf4f81f
--- /dev/null
+++ b/datapath/vport-gtp.c
@@ -0,0 +1,146 @@
+/*
+ * 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"
+
+extern struct net_device *gtp_create_flow_based_dev(struct net *net, const char *name,
+ u8 name_assign_type, u16 dst_port);
+
+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 = gtp_xmit,
+};
+
+static int __init ovs_gtp_tnl_init(void)
+{
+ return ovs_vport_ops_register(&ovs_gtp_vport_ops);
+}
+
+static void __exit ovs_gtp_tnl_exit(void)
+{
+ ovs_vport_ops_unregister(&ovs_gtp_vport_ops);
+}
+
+module_init(ovs_gtp_tnl_init);
+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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