openvswitch: Add vxlan tunneling support. (58264848) · Commits · e / devices / android_kernel_teracube_emerald

include/uapi/linux/openvswitch.h

+11 −0

Original line number	Diff line number	Diff line
		@@ -165,6 +165,7 @@ enum ovs_vport_type {
		OVS_VPORT_TYPE_NETDEV, /* network device */
		OVS_VPORT_TYPE_INTERNAL, /* network device implemented by datapath */
		OVS_VPORT_TYPE_GRE, /* GRE tunnel. */
		OVS_VPORT_TYPE_VXLAN, /* VXLAN tunnel. */
		__OVS_VPORT_TYPE_MAX
		};

		@@ -211,6 +212,16 @@ enum ovs_vport_attr {

		#define OVS_VPORT_ATTR_MAX (__OVS_VPORT_ATTR_MAX - 1)

		/* OVS_VPORT_ATTR_OPTIONS attributes for tunnels.
		*/
		enum {
		OVS_TUNNEL_ATTR_UNSPEC,
		OVS_TUNNEL_ATTR_DST_PORT, /* 16-bit UDP port, used by L4 tunnels. */
		__OVS_TUNNEL_ATTR_MAX
		};

		#define OVS_TUNNEL_ATTR_MAX (__OVS_TUNNEL_ATTR_MAX - 1)

		/* Flows. */

		#define OVS_FLOW_FAMILY "ovs_flow"

net/openvswitch/Kconfig

+13 −0

Original line number	Diff line number	Diff line
		@@ -40,3 +40,16 @@ config OPENVSWITCH_GRE
		Say N to exclude this support and reduce the binary size.

		If unsure, say Y.

		config OPENVSWITCH_VXLAN
		bool "Open vSwitch VXLAN tunneling support"
		depends on INET
		depends on OPENVSWITCH
		depends on VXLAN && !(OPENVSWITCH=y && VXLAN=m)
		default y
		---help---
		If you say Y here, then the Open vSwitch will be able create vxlan vport.

		Say N to exclude this support and reduce the binary size.

		If unsure, say Y.

net/openvswitch/Makefile

+4 −0

Original line number	Diff line number	Diff line
		@@ -13,3 +13,7 @@ openvswitch-y := \
		vport-gre.o \
		vport-internal_dev.o \
		vport-netdev.o

		ifneq ($(CONFIG_OPENVSWITCH_VXLAN),)
		openvswitch-y += vport-vxlan.o
		endif

net/openvswitch/vport-vxlan.c

0 → 100644

+204 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (c) 2013 Nicira, Inc.
		* Copyright (c) 2013 Cisco Systems, Inc.
		*
		* This program is free software; you can redistribute it and/or
		* modify it under the terms of version 2 of the GNU General Public
		* License as published by the Free Software Foundation.
		*
		* This program is distributed in the hope that it will be useful, but
		* WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
		* General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
		* 02110-1301, USA
		*/

		#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 <net/icmp.h>
		#include <net/ip.h>
		#include <net/udp.h>
		#include <net/ip_tunnels.h>
		#include <net/udp.h>
		#include <net/rtnetlink.h>
		#include <net/route.h>
		#include <net/dsfield.h>
		#include <net/inet_ecn.h>
		#include <net/net_namespace.h>
		#include <net/netns/generic.h>
		#include <net/vxlan.h>

		#include "datapath.h"
		#include "vport.h"

		/**
		* struct vxlan_port - Keeps track of open UDP ports
		* @vs: vxlan_sock created for the port.
		* @name: vport name.
		*/
		struct vxlan_port {
		struct vxlan_sock *vs;
		char name[IFNAMSIZ];
		};

		static inline struct vxlan_port vxlan_vport(const struct vport vport)
		{
		return vport_priv(vport);
		}

		/* Called with rcu_read_lock and BH disabled. */
		static void vxlan_rcv(struct vxlan_sock vs, struct sk_buff skb, __be32 vx_vni)
		{
		struct ovs_key_ipv4_tunnel tun_key;
		struct vport *vport = vs->data;
		struct iphdr *iph;
		__be64 key;

		/* Save outer tunnel values */
		iph = ip_hdr(skb);
		key = cpu_to_be64(ntohl(vx_vni) >> 8);
		ovs_flow_tun_key_init(&tun_key, iph, key, TUNNEL_KEY);

		ovs_vport_receive(vport, skb, &tun_key);
		}

		static int vxlan_get_options(const struct vport vport, struct sk_buff skb)
		{
		struct vxlan_port *vxlan_port = vxlan_vport(vport);
		__be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;

		if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
		return -EMSGSIZE;
		return 0;
		}

		static void vxlan_tnl_destroy(struct vport *vport)
		{
		struct vxlan_port *vxlan_port = vxlan_vport(vport);

		vxlan_sock_release(vxlan_port->vs);

		ovs_vport_deferred_free(vport);
		}

		static struct vport vxlan_tnl_create(const struct vport_parms parms)
		{
		struct net *net = ovs_dp_get_net(parms->dp);
		struct nlattr *options = parms->options;
		struct vxlan_port *vxlan_port;
		struct vxlan_sock *vs;
		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 vxlan_port),
		&ovs_vxlan_vport_ops, parms);
		if (IS_ERR(vport))
		return vport;

		vxlan_port = vxlan_vport(vport);
		strncpy(vxlan_port->name, parms->name, IFNAMSIZ);

		vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true);
		if (IS_ERR(vs)) {
		ovs_vport_free(vport);
		return (void *)vs;
		}
		vxlan_port->vs = vs;

		return vport;

		error:
		return ERR_PTR(err);
		}

		static int vxlan_tnl_send(struct vport vport, struct sk_buff skb)
		{
		struct net *net = ovs_dp_get_net(vport->dp);
		struct vxlan_port *vxlan_port = vxlan_vport(vport);
		__be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
		struct rtable *rt;
		struct flowi4 fl;
		__be16 src_port;
		int port_min;
		int port_max;
		__be16 df;
		int err;

		if (unlikely(!OVS_CB(skb)->tun_key)) {
		err = -EINVAL;
		goto error;
		}

		/* Route lookup */
		memset(&fl, 0, sizeof(fl));
		fl.daddr = OVS_CB(skb)->tun_key->ipv4_dst;
		fl.saddr = OVS_CB(skb)->tun_key->ipv4_src;
		fl.flowi4_tos = RT_TOS(OVS_CB(skb)->tun_key->ipv4_tos);
		fl.flowi4_mark = skb->mark;
		fl.flowi4_proto = IPPROTO_UDP;

		rt = ip_route_output_key(net, &fl);
		if (IS_ERR(rt)) {
		err = PTR_ERR(rt);
		goto error;
		}

		df = OVS_CB(skb)->tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
		htons(IP_DF) : 0;

		skb->local_df = 1;

		inet_get_local_port_range(&port_min, &port_max);
		src_port = vxlan_src_port(port_min, port_max, skb);

		err = vxlan_xmit_skb(net, vxlan_port->vs, rt, skb,
		fl.saddr, OVS_CB(skb)->tun_key->ipv4_dst,
		OVS_CB(skb)->tun_key->ipv4_tos,
		OVS_CB(skb)->tun_key->ipv4_ttl, df,
		src_port, dst_port,
		htonl(be64_to_cpu(OVS_CB(skb)->tun_key->tun_id) << 8));
		if (err < 0)
		ip_rt_put(rt);
		error:
		return err;
		}

		static const char vxlan_get_name(const struct vport vport)
		{
		struct vxlan_port *vxlan_port = vxlan_vport(vport);
		return vxlan_port->name;
		}

		const struct vport_ops ovs_vxlan_vport_ops = {
		.type = OVS_VPORT_TYPE_VXLAN,
		.create = vxlan_tnl_create,
		.destroy = vxlan_tnl_destroy,
		.get_name = vxlan_get_name,
		.get_options = vxlan_get_options,
		.send = vxlan_tnl_send,
		};

net/openvswitch/vport.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -42,6 +42,9 @@ static const struct vport_ops *vport_ops_list[] = {
		#ifdef CONFIG_OPENVSWITCH_GRE
		&ovs_gre_vport_ops,
		#endif
		#ifdef CONFIG_OPENVSWITCH_VXLAN
		&ovs_vxlan_vport_ops,
		#endif
		};

		/* Protected by RCU read lock for reading, ovs_mutex for writing. */