1 files changed, 2006 insertions, 94 deletions

diff --git a/datapath/linux/compat/vxlan.c b/datapath/linux/compat/vxlan.c
index fd454ae29..4076a2fd3 100644
--- a/datapath/linux/compat/vxlan.c
+++ b/datapath/linux/compat/vxlan.c
@@ -1,25 +1,13 @@
 /*
- * Copyright (c) 2007-2013 Nicira, Inc.
+ * VXLAN: Virtual eXtensible Local Area Network
  *
- * 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.
+ * Copyright (c) 2012-2013 Vyatta Inc.
  *
- * 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
- *
- * This code is derived from kernel vxlan module.
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
  */
 
-#include <linux/version.h>
-
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/kernel.h>
@@ -39,10 +27,10 @@
 #include <linux/if_vlan.h>
 #include <linux/hash.h>
 #include <linux/ethtool.h>
+#include <linux/netdev_features.h>
 #include <net/arp.h>
 #include <net/ndisc.h>
 #include <net/ip.h>
-#include <net/gre.h>
 #include <net/ip_tunnels.h>
 #include <net/icmp.h>
 #include <net/udp.h>
@@ -54,27 +42,878 @@
 #include <net/net_namespace.h>
 #include <net/netns/generic.h>
 #include <net/vxlan.h>
+#include <net/protocol.h>
+#include <net/udp_tunnel.h>
+#include <net/ip6_route.h>
+#if IS_ENABLED(CONFIG_IPV6)
+#include <net/ipv6.h>
+#include <net/addrconf.h>
+#include <net/ip6_tunnel.h>
+#include <net/ip6_checksum.h>
+#endif
+#include <net/dst_metadata.h>
 
-#include "compat.h"
-#include "datapath.h"
+#ifndef HAVE_METADATA_DST
 #include "gso.h"
-#include "vlan.h"
+#include "vport-netdev.h"
+
+#define VXLAN_VERSION	"0.1"
+
+#define PORT_HASH_BITS	8
+#define PORT_HASH_SIZE  (1<<PORT_HASH_BITS)
+#define FDB_AGE_DEFAULT 300 /* 5 min */
+#define FDB_AGE_INTERVAL (10 * HZ)	/* rescan interval */
+
+#ifndef NTF_SELF
+#define NTF_SELF        0x02
+#endif
+
+/* UDP port for VXLAN traffic.
+ * The IANA assigned port is 4789, but the Linux default is 8472
+ * for compatibility with early adopters.
+ */
+static unsigned short vxlan_port __read_mostly = 8472;
+module_param_named(udp_port, vxlan_port, ushort, 0444);
+MODULE_PARM_DESC(udp_port, "Destination UDP port");
+
+static int vxlan_net_id;
+static struct rtnl_link_ops vxlan_link_ops;
 
-#ifndef USE_UPSTREAM_VXLAN
+static const u8 all_zeros_mac[ETH_ALEN];
 
-/* VXLAN protocol header */
-struct vxlanhdr {
-	__be32 vx_flags;
-	__be32 vx_vni;
+static struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
+					 bool no_share, u32 flags);
+
+/* per-network namespace private data for this module */
+struct vxlan_net {
+	struct list_head  vxlan_list;
+	struct hlist_head sock_list[PORT_HASH_SIZE];
+	spinlock_t	  sock_lock;
+};
+
+/* Forwarding table entry */
+struct vxlan_fdb {
+	struct hlist_node hlist;	/* linked list of entries */
+	struct rcu_head	  rcu;
+	unsigned long	  updated;	/* jiffies */
+	unsigned long	  used;
+	struct list_head  remotes;
+	u8		  eth_addr[ETH_ALEN];
+	u16		  state;	/* see ndm_state */
+	u8		  flags;	/* see ndm_flags */
 };
 
+/* salt for hash table */
+static u32 vxlan_salt __read_mostly;
+static struct workqueue_struct *vxlan_wq;
+
+static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
+{
+	return vs->flags & VXLAN_F_COLLECT_METADATA ||
+	       ip_tunnel_collect_metadata();
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static inline
+bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
+{
+	if (a->sa.sa_family != b->sa.sa_family)
+		return false;
+	if (a->sa.sa_family == AF_INET6)
+		return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
+	else
+		return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
+}
+
+static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
+{
+	if (ipa->sa.sa_family == AF_INET6)
+		return ipv6_addr_any(&ipa->sin6.sin6_addr);
+	else
+		return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
+}
+
+static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
+{
+	if (ipa->sa.sa_family == AF_INET6)
+		return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
+	else
+		return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
+}
+
+#else /* !CONFIG_IPV6 */
+
+static inline
+bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
+{
+	return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
+}
+
+static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
+{
+	return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
+}
+
+static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
+{
+	return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
+}
+
+#endif
+
+/* Virtual Network hash table head */
+static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
+{
+	return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
+}
+
+/* Socket hash table head */
+static inline struct hlist_head *vs_head(struct net *net, __be16 port)
+{
+	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+
+	return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
+}
+
+/* First remote destination for a forwarding entry.
+ * Guaranteed to be non-NULL because remotes are never deleted.
+ */
+static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
+{
+	return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
+}
+
+static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
+{
+	return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
+}
+
+/* Find VXLAN socket based on network namespace, address family and UDP port
+ * and enabled unshareable flags.
+ */
+static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
+					  __be16 port, u32 flags)
+{
+	struct vxlan_sock *vs;
+
+	flags &= VXLAN_F_RCV_FLAGS;
+
+	hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
+		if (inet_sport(vs->sock->sk) == port &&
+		    vxlan_get_sk_family(vs) == family &&
+		    vs->flags == flags)
+			return vs;
+	}
+	return NULL;
+}
+
+static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
+{
+	struct vxlan_dev *vxlan;
+
+	hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
+		if (vxlan->default_dst.remote_vni == id)
+			return vxlan;
+	}
+
+	return NULL;
+}
+
+/* Look up VNI in a per net namespace table */
+static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
+					sa_family_t family, __be16 port,
+					u32 flags)
+{
+	struct vxlan_sock *vs;
+
+	vs = vxlan_find_sock(net, family, port, flags);
+	if (!vs)
+		return NULL;
+
+	return vxlan_vs_find_vni(vs, id);
+}
+
+/* Fill in neighbour message in skbuff. */
+static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
+			  const struct vxlan_fdb *fdb,
+			  u32 portid, u32 seq, int type, unsigned int flags,
+			  const struct vxlan_rdst *rdst)
+{
+	return -EINVAL;
+}
+
+static inline size_t vxlan_nlmsg_size(void)
+{
+	return NLMSG_ALIGN(sizeof(struct ndmsg))
+		+ nla_total_size(ETH_ALEN) /* NDA_LLADDR */
+		+ nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
+		+ nla_total_size(sizeof(__be16)) /* NDA_PORT */
+		+ nla_total_size(sizeof(__be32)) /* NDA_VNI */
+		+ nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
+		+ nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
+		+ nla_total_size(sizeof(struct nda_cacheinfo));
+}
+
+static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
+			     struct vxlan_rdst *rd, int type)
+{
+	struct net *net = dev_net(vxlan->dev);
+	struct sk_buff *skb;
+	int err = -ENOBUFS;
+
+	skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
+	if (skb == NULL)
+		goto errout;
+
+	err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
+	if (err < 0) {
+		/* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
+		WARN_ON(err == -EMSGSIZE);
+		kfree_skb(skb);
+		goto errout;
+	}
+
+	rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
+	return;
+errout:
+	if (err < 0)
+		rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
+}
+
+/* Hash Ethernet address */
+static u32 eth_hash(const unsigned char *addr)
+{
+	u64 value = get_unaligned((u64 *)addr);
+
+	/* only want 6 bytes */
+#ifdef __BIG_ENDIAN
+	value >>= 16;
+#else
+	value <<= 16;
+#endif
+	return hash_64(value, FDB_HASH_BITS);
+}
+
+/* Hash chain to use given mac address */
+static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
+						const u8 *mac)
+{
+	return &vxlan->fdb_head[eth_hash(mac)];
+}
+
+/* Look up Ethernet address in forwarding table */
+static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
+					const u8 *mac)
+{
+	struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
+	struct vxlan_fdb *f;
+
+	hlist_for_each_entry_rcu(f, head, hlist) {
+		if (ether_addr_equal(mac, f->eth_addr))
+			return f;
+	}
+
+	return NULL;
+}
+
+static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
+					const u8 *mac)
+{
+	struct vxlan_fdb *f;
+
+	f = __vxlan_find_mac(vxlan, mac);
+	if (f)
+		f->used = jiffies;
+
+	return f;
+}
+
+/* caller should hold vxlan->hash_lock */
+static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
+					      union vxlan_addr *ip, __be16 port,
+					      __u32 vni, __u32 ifindex)
+{
+	struct vxlan_rdst *rd;
+
+	list_for_each_entry(rd, &f->remotes, list) {
+		if (vxlan_addr_equal(&rd->remote_ip, ip) &&
+		    rd->remote_port == port &&
+		    rd->remote_vni == vni &&
+		    rd->remote_ifindex == ifindex)
+			return rd;
+	}
+
+	return NULL;
+}
+
+/* Replace destination of unicast mac */
+static int vxlan_fdb_replace(struct vxlan_fdb *f,
+			     union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
+{
+	struct vxlan_rdst *rd;
+
+	rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
+	if (rd)
+		return 0;
+
+	rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
+	if (!rd)
+		return 0;
+	rd->remote_ip = *ip;
+	rd->remote_port = port;
+	rd->remote_vni = vni;
+	rd->remote_ifindex = ifindex;
+	return 1;
+}
+
+/* Add/update destinations for multicast */
+static int vxlan_fdb_append(struct vxlan_fdb *f,
+			    union vxlan_addr *ip, __be16 port, __u32 vni,
+			    __u32 ifindex, struct vxlan_rdst **rdp)
+{
+	struct vxlan_rdst *rd;
+
+	rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
+	if (rd)
+		return 0;
+
+	rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
+	if (rd == NULL)
+		return -ENOBUFS;
+	rd->remote_ip = *ip;
+	rd->remote_port = port;
+	rd->remote_vni = vni;
+	rd->remote_ifindex = ifindex;
+
+	list_add_tail_rcu(&rd->list, &f->remotes);
+
+	*rdp = rd;
+	return 1;
+}
+
+#ifdef HAVE_UDP_OFFLOAD
+#ifdef HAVE_NETIF_F_GSO_TUNNEL_REMCSUM
+static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
+					  unsigned int off,
+					  struct vxlanhdr *vh, size_t hdrlen,
+					  u32 data, struct gro_remcsum *grc,
+					  bool nopartial)
+{
+	size_t start, offset;
+
+	if (skb->remcsum_offload)
+		return vh;
+
+	if (!NAPI_GRO_CB(skb)->csum_valid)
+		return NULL;
+
+	start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
+	offset = start + ((data & VXLAN_RCO_UDP) ?
+			  offsetof(struct udphdr, check) :
+			  offsetof(struct tcphdr, check));
+
+	vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
+				     start, offset, grc, nopartial);
+
+	skb->remcsum_offload = 1;
+
+	return vh;
+}
+#else
+static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
+					  unsigned int off,
+					  struct vxlanhdr *vh, size_t hdrlen,
+					  u32 data, struct gro_remcsum *grc,
+					  bool nopartial)
+{
+	return NULL;
+}
+#endif
+
+#ifndef HAVE_UDP_OFFLOAD_ARG_UOFF
+static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
+					   struct sk_buff *skb)
+#else
+static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
+					   struct sk_buff *skb,
+					   struct udp_offload *uoff)
+#endif
+{
+#ifdef HAVE_UDP_OFFLOAD_ARG_UOFF
+	struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
+					     udp_offloads);
+#else
+	struct vxlan_sock *vs = NULL;
+#endif
+	struct sk_buff *p, **pp = NULL;
+	struct vxlanhdr *vh, *vh2;
+	unsigned int hlen, off_vx;
+	int flush = 1;
+	u32 flags;
+	struct gro_remcsum grc;
+
+	skb_gro_remcsum_init(&grc);
+
+	off_vx = skb_gro_offset(skb);
+	hlen = off_vx + sizeof(*vh);
+	vh   = skb_gro_header_fast(skb, off_vx);
+	if (skb_gro_header_hard(skb, hlen)) {
+		vh = skb_gro_header_slow(skb, hlen, off_vx);
+		if (unlikely(!vh))
+			goto out;
+	}
+
+	skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
+
+	flags = ntohl(vh->vx_flags);
+
+	if ((flags & VXLAN_HF_RCO) && vs && (vs->flags & VXLAN_F_REMCSUM_RX)) {
+
+		vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
+				       ntohl(vh->vx_vni), &grc,
+				       !!(vs->flags &
+					  VXLAN_F_REMCSUM_NOPARTIAL));
+
+		if (!vh)
+			goto out;
+	}
+
+	skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
+
+	flush = 0;
+
+	for (p = *head; p; p = p->next) {
+		if (!NAPI_GRO_CB(p)->same_flow)
+			continue;
+
+		vh2 = (struct vxlanhdr *)(p->data + off_vx);
+		if (vh->vx_flags != vh2->vx_flags ||
+		    vh->vx_vni != vh2->vx_vni) {
+			NAPI_GRO_CB(p)->same_flow = 0;
+			continue;
+		}
+	}
+
+	pp = eth_gro_receive(head, skb);
+
+out:
+	skb_gro_remcsum_cleanup(skb, &grc);
+	NAPI_GRO_CB(skb)->flush |= flush;
+
+	return pp;
+}
+
+#ifndef HAVE_UDP_OFFLOAD_ARG_UOFF
+static int vxlan_gro_complete(struct sk_buff *skb, int nhoff)
+#else
+static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
+			       struct udp_offload *uoff)
+#endif
+{
+	udp_tunnel_gro_complete(skb, nhoff);
+
+	return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
+}
+
+/* Notify netdevs that UDP port started listening */
+static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
+{
+	struct net_device *dev;
+	struct sock *sk = vs->sock->sk;
+	struct net *net = sock_net(sk);
+	sa_family_t sa_family = vxlan_get_sk_family(vs);
+	__be16 port = inet_sk(sk)->inet_sport;
+	int err;
+
+	if (sa_family == AF_INET) {
+		err = udp_add_offload(&vs->udp_offloads);
+		if (err)
+			pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
+	}
+
+	rcu_read_lock();
+	for_each_netdev_rcu(net, dev) {
+		if (dev->netdev_ops->ndo_add_vxlan_port)
+			dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
+							    port);
+	}
+	rcu_read_unlock();
+}
+
+/* Notify netdevs that UDP port is no more listening */
+static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
+{
+	struct net_device *dev;
+	struct sock *sk = vs->sock->sk;
+	struct net *net = sock_net(sk);
+	sa_family_t sa_family = vxlan_get_sk_family(vs);
+	__be16 port = inet_sk(sk)->inet_sport;
+
+	rcu_read_lock();
+	for_each_netdev_rcu(net, dev) {
+		if (dev->netdev_ops->ndo_del_vxlan_port)
+			dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
+							    port);
+	}
+	rcu_read_unlock();
+
+	if (sa_family == AF_INET)
+		udp_del_offload(&vs->udp_offloads);
+}
+#endif
+
+/* Add new entry to forwarding table -- assumes lock held */
+static int vxlan_fdb_create(struct vxlan_dev *vxlan,
+			    const u8 *mac, union vxlan_addr *ip,
+			    __u16 state, __u16 flags,
+			    __be16 port, __u32 vni, __u32 ifindex,
+			    __u8 ndm_flags)
+{
+	struct vxlan_rdst *rd = NULL;
+	struct vxlan_fdb *f;
+	int notify = 0;
+
+	f = __vxlan_find_mac(vxlan, mac);
+	if (f) {
+		if (flags & NLM_F_EXCL) {
+			netdev_dbg(vxlan->dev,
+				   "lost race to create %pM\n", mac);
+			return -EEXIST;
+		}
+		if (f->state != state) {
+			f->state = state;
+			f->updated = jiffies;
+			notify = 1;
+		}
+		if (f->flags != ndm_flags) {
+			f->flags = ndm_flags;
+			f->updated = jiffies;
+			notify = 1;
+		}
+		if ((flags & NLM_F_REPLACE)) {
+			/* Only change unicasts */
+			if (!(is_multicast_ether_addr(f->eth_addr) ||
+			     is_zero_ether_addr(f->eth_addr))) {
+				notify |= vxlan_fdb_replace(f, ip, port, vni,
+							   ifindex);
+			} else
+				return -EOPNOTSUPP;
+		}
+		if ((flags & NLM_F_APPEND) &&
+		    (is_multicast_ether_addr(f->eth_addr) ||
+		     is_zero_ether_addr(f->eth_addr))) {
+			int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
+						  &rd);
+
+			if (rc < 0)
+				return rc;
+			notify |= rc;
+		}
+	} else {
+		if (!(flags & NLM_F_CREATE))
+			return -ENOENT;
+
+		if (vxlan->cfg.addrmax &&
+		    vxlan->addrcnt >= vxlan->cfg.addrmax)
+			return -ENOSPC;
+
+		/* Disallow replace to add a multicast entry */
+		if ((flags & NLM_F_REPLACE) &&
+		    (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
+			return -EOPNOTSUPP;
+
+		netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
+		f = kmalloc(sizeof(*f), GFP_ATOMIC);
+		if (!f)
+			return -ENOMEM;
+
+		notify = 1;
+		f->state = state;
+		f->flags = ndm_flags;
+		f->updated = f->used = jiffies;
+		INIT_LIST_HEAD(&f->remotes);
+		memcpy(f->eth_addr, mac, ETH_ALEN);
+
+		vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
+
+		++vxlan->addrcnt;
+		hlist_add_head_rcu(&f->hlist,
+				   vxlan_fdb_head(vxlan, mac));
+	}
+
+	if (notify) {
+		if (rd == NULL)
+			rd = first_remote_rtnl(f);
+		vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
+	}
+
+	return 0;
+}
+
+static void vxlan_fdb_free(struct rcu_head *head)
+{
+	struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
+	struct vxlan_rdst *rd, *nd;
+
+	list_for_each_entry_safe(rd, nd, &f->remotes, list)
+		kfree(rd);
+	kfree(f);
+}
+
+static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
+{
+	netdev_dbg(vxlan->dev,
+		    "delete %pM\n", f->eth_addr);
+
+	--vxlan->addrcnt;
+	vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
+
+	hlist_del_rcu(&f->hlist);
+	call_rcu(&f->rcu, vxlan_fdb_free);
+}
+
+/* Watch incoming packets to learn mapping between Ethernet address
+ * and Tunnel endpoint.
+ * Return true if packet is bogus and should be dropped.
+ */
+static bool vxlan_snoop(struct net_device *dev,
+			union vxlan_addr *src_ip, const u8 *src_mac)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	struct vxlan_fdb *f;
+
+	f = vxlan_find_mac(vxlan, src_mac);
+	if (likely(f)) {
+		struct vxlan_rdst *rdst = first_remote_rcu(f);
+
+		if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
+			return false;
+
+		/* Don't migrate static entries, drop packets */
+		if (f->state & NUD_NOARP)
+			return true;
+
+		if (net_ratelimit())
+			netdev_info(dev,
+				    "%pM migrated from %pIS to %pIS\n",
+				    src_mac, &rdst->remote_ip.sa, &src_ip->sa);
+
+		rdst->remote_ip = *src_ip;
+		f->updated = jiffies;
+		vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
+	} else {
+		/* learned new entry */
+		spin_lock(&vxlan->hash_lock);
+
+		/* close off race between vxlan_flush and incoming packets */
+		if (netif_running(dev))
+			vxlan_fdb_create(vxlan, src_mac, src_ip,
+					 NUD_REACHABLE,
+					 NLM_F_EXCL|NLM_F_CREATE,
+					 vxlan->cfg.dst_port,
+					 vxlan->default_dst.remote_vni,
+					 0, NTF_SELF);
+		spin_unlock(&vxlan->hash_lock);
+	}
+
+	return false;
+}
+
+/* See if multicast group is already in use by other ID */
+static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
+{
+	struct vxlan_dev *vxlan;
+
+	/* The vxlan_sock is only used by dev, leaving group has
+	 * no effect on other vxlan devices.
+	 */
+	if (atomic_read(&dev->vn_sock->refcnt) == 1)
+		return false;
+
+	list_for_each_entry(vxlan, &vn->vxlan_list, next) {
+		if (!netif_running(vxlan->dev) || vxlan == dev)
+			continue;
+
+		if (vxlan->vn_sock != dev->vn_sock)
+			continue;
+
+		if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
+				      &dev->default_dst.remote_ip))
+			continue;
+
+		if (vxlan->default_dst.remote_ifindex !=
+		    dev->default_dst.remote_ifindex)
+			continue;
+
+		return true;
+	}
+
+	return false;
+}
+
+static void vxlan_sock_release(struct vxlan_sock *vs)
+{
+	struct sock *sk = vs->sock->sk;
+	struct net *net = sock_net(sk);
+	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+
+	if (!atomic_dec_and_test(&vs->refcnt))
+		return;
+
+	spin_lock(&vn->sock_lock);
+	hlist_del_rcu(&vs->hlist);
+#ifdef HAVE_UDP_OFFLOAD
+	vxlan_notify_del_rx_port(vs);
+#endif
+	spin_unlock(&vn->sock_lock);
+
+	queue_work(vxlan_wq, &vs->del_work);
+}
+
+/* Update multicast group membership when first VNI on
+ * multicast address is brought up
+ */
+static int vxlan_igmp_join(struct vxlan_dev *vxlan)
+{
+	return -EINVAL;
+}
+
+/* Inverse of vxlan_igmp_join when last VNI is brought down */
+static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
+{
+	return -EINVAL;
+}
+
+#ifdef HAVE_VXLAN_HF_RCO
+static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
+				      size_t hdrlen, u32 data, bool nopartial)
+{
+	size_t start, offset, plen;
+
+	if (skb->remcsum_offload)
+		return vh;
+
+	start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
+	offset = start + ((data & VXLAN_RCO_UDP) ?
+			  offsetof(struct udphdr, check) :
+			  offsetof(struct tcphdr, check));
+
+	plen = hdrlen + offset + sizeof(u16);
+
+	if (!pskb_may_pull(skb, plen))
+		return NULL;
+
+	vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
+
+	skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset,
+			    nopartial);
+
+	return vh;
+}
+#endif
+
+static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
+		      struct vxlan_metadata *md, u32 vni,
+		      struct metadata_dst *tun_dst)
+{
+	struct iphdr *oip = NULL;
+	struct ipv6hdr *oip6 = NULL;
+	struct vxlan_dev *vxlan;
+#ifdef HAVE_DEV_TSTATS
+	struct pcpu_sw_netstats *stats;
+#endif
+	union vxlan_addr saddr;
+	int err = 0;
+	union vxlan_addr *remote_ip;
+
+	/* For flow based devices, map all packets to VNI 0 */
+	if (vs->flags & VXLAN_F_COLLECT_METADATA)
+		vni = 0;
+
+	/* Is this VNI defined? */
+	vxlan = vxlan_vs_find_vni(vs, vni);
+	if (!vxlan)
+		goto drop;
+
+	remote_ip = &vxlan->default_dst.remote_ip;
+	skb_reset_mac_header(skb);
+	skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
+	skb->protocol = eth_type_trans(skb, vxlan->dev);
+	skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
+
+	/* Ignore packet loops (and multicast echo) */
+	if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
+		goto drop;
+
+	/* Re-examine inner Ethernet packet */
+	if (remote_ip->sa.sa_family == AF_INET) {
+		oip = ip_hdr(skb);
+		saddr.sin.sin_addr.s_addr = oip->saddr;
+		saddr.sa.sa_family = AF_INET;
+#if IS_ENABLED(CONFIG_IPV6)
+	} else {
+		oip6 = ipv6_hdr(skb);
+		saddr.sin6.sin6_addr = oip6->saddr;
+		saddr.sa.sa_family = AF_INET6;
+#endif
+	}
+
+	if (tun_dst) {
+		ovs_skb_dst_set(skb, (struct dst_entry *)tun_dst);
+		tun_dst = NULL;
+	} else {
+		goto drop;
+	}
+
+	if ((vxlan->flags & VXLAN_F_LEARN) &&
+	    vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
+		goto drop;
+
+	skb_reset_network_header(skb);
+	/* In flow-based mode, GBP is carried in dst_metadata */
+	if (!(vs->flags & VXLAN_F_COLLECT_METADATA))
+		skb->mark = md->gbp;
+
+	if (oip6)
+		err = IP6_ECN_decapsulate(oip6, skb);
+	if (oip)
+		err = IP_ECN_decapsulate(oip, skb);
+
+	if (unlikely(err)) {
+		if (err > 1) {
+			++vxlan->dev->stats.rx_frame_errors;
+			++vxlan->dev->stats.rx_errors;
+			goto drop;
+		}
+	}
+
+#ifdef HAVE_DEV_TSTATS
+	stats = this_cpu_ptr((struct pcpu_sw_netstats __percpu *)vxlan->dev->tstats);
+	u64_stats_update_begin(&stats->syncp);
+	stats->rx_packets++;
+	stats->rx_bytes += skb->len;
+	u64_stats_update_end(&stats->syncp);
+#endif
+	netdev_port_receive(skb, skb_tunnel_info(skb));
+	return;
+drop:
+
+	/* Consume bad packet */
+	kfree_skb(skb);
+}
+
 /* Callback from net/ipv4/udp.c to receive packets */
 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 {
 	struct vxlan_sock *vs;
 	struct vxlanhdr *vxh;
 	u32 flags, vni;
-	struct vxlan_metadata md = {0};
+	struct vxlan_metadata _md;
+	struct vxlan_metadata *md = &_md;
+	union {
+		struct metadata_dst dst;
+		char buf[sizeof(struct metadata_dst) + sizeof(*md)];
+	} buf;
 
 	/* Need Vxlan and inner Ethernet header to be present */
 	if (!pskb_may_pull(skb, VXLAN_HLEN))
@@ -93,73 +932,83 @@ static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 
 	if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
 		goto drop;
+	vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
 
 	vs = rcu_dereference_sk_user_data(sk);
 	if (!vs)
 		goto drop;
 
+#ifdef HAVE_VXLAN_HF_RCO
+	if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
+		vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni,
+				    !!(vs->flags & VXLAN_F_REMCSUM_NOPARTIAL));
+		if (!vxh)
+			goto drop;
+
+		flags &= ~VXLAN_HF_RCO;
+		vni &= VXLAN_VNI_MASK;
+	}
+#endif
+
+	if (vxlan_collect_metadata(vs)) {
+		ovs_udp_tun_rx_dst(&buf.dst.u.tun_info, skb, AF_INET, TUNNEL_KEY,
+				   cpu_to_be64(vni >> 8), sizeof(*md));
+
+		md = ip_tunnel_info_opts(&buf.dst.u.tun_info);
+	} else {
+		memset(md, 0, sizeof(*md));
+	}
+
 	/* For backwards compatibility, only allow reserved fields to be
-	* used by VXLAN extensions if explicitly requested.
-	*/
+	 * used by VXLAN extensions if explicitly requested.
+	 */
 	if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
 		struct vxlanhdr_gbp *gbp;
 
 		gbp = (struct vxlanhdr_gbp *)vxh;
-		md.gbp = ntohs(gbp->policy_id);
+		md->gbp = ntohs(gbp->policy_id);
+
+		buf.dst.u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
 
 		if (gbp->dont_learn)
-			md.gbp |= VXLAN_GBP_DONT_LEARN;
+			md->gbp |= VXLAN_GBP_DONT_LEARN;
 
 		if (gbp->policy_applied)
-			md.gbp |= VXLAN_GBP_POLICY_APPLIED;
+			md->gbp |= VXLAN_GBP_POLICY_APPLIED;
 
 		flags &= ~VXLAN_GBP_USED_BITS;
 	}
 
-	if (flags || (vni & 0xff)) {
+	if (flags || vni & ~VXLAN_VNI_MASK) {
 		/* If there are any unprocessed flags remaining treat
-		* this as a malformed packet. This behavior diverges from
-		* VXLAN RFC (RFC7348) which stipulates that bits in reserved
-		* in reserved fields are to be ignored. The approach here
-		* maintains compatbility with previous stack code, and also
-		* is more robust and provides a little more security in
-		* adding extensions to VXLAN.
-		*/
+		 * this as a malformed packet. This behavior diverges from
+		 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
+		 * in reserved fields are to be ignored. The approach here
+		 * maintains compatibility with previous stack code, and also
+		 * is more robust and provides a little more security in
+		 * adding extensions to VXLAN.
+		 */
 
 		goto bad_flags;
 	}
 
-	md.vni = vxh->vx_vni;
-	vs->rcv(vs, skb, &md);
+	vxlan_rcv(vs, skb, md, vni >> 8, &buf.dst);
 	return 0;
 
 drop:
 	/* Consume bad packet */
 	kfree_skb(skb);
 	return 0;
+
 bad_flags:
-	pr_debug("invalid vxlan flags=%#x vni=%#x\n",
-		 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
+	netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
+		   ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
 
 error:
 	/* Return non vxlan pkt */
 	return 1;
 }
 
-static void vxlan_sock_put(struct sk_buff *skb)
-{
-	sock_put(skb->sk);
-}
-
-/* On transmit, associate with the tunnel socket */
-static void vxlan_set_owner(struct sock *sk, struct sk_buff *skb)
-{
-	skb_orphan(skb);
-	sock_hold(sk);
-	skb->sk = sk;
-	skb->destructor = vxlan_sock_put;
-}
-
 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
 				struct vxlan_metadata *md)
 {
@@ -180,15 +1029,130 @@ static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
 	gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
 }
 
-int rpl_vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
-		       __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
-		       __be16 src_port, __be16 dst_port,
-		       struct vxlan_metadata *md, bool xnet, u32 vxflags)
+#if IS_ENABLED(CONFIG_IPV6)
+static int vxlan6_xmit_skb(struct dst_entry *dst, struct sock *sk,
+			   struct sk_buff *skb,
+			   struct net_device *dev, struct in6_addr *saddr,
+			   struct in6_addr *daddr, __u8 prio, __u8 ttl,
+			   __be16 src_port, __be16 dst_port, __be32 vni,
+			   struct vxlan_metadata *md, bool xnet, u32 vxflags)
+{
+	struct vxlanhdr *vxh;
+	int min_headroom;
+	int err;
+	bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX);
+	int type = 0;
+
+	if ((vxflags & VXLAN_F_REMCSUM_TX) &&
+	    skb->ip_summed == CHECKSUM_PARTIAL) {
+		int csum_start = skb_checksum_start_offset(skb);
+
+		if (csum_start <= VXLAN_MAX_REMCSUM_START &&
+		    !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
+		    (skb->csum_offset == offsetof(struct udphdr, check) ||
+		     skb->csum_offset == offsetof(struct tcphdr, check))) {
+			udp_sum = false;
+			type |= SKB_GSO_TUNNEL_REMCSUM;
+			/* Add support for remote csum. */
+			if (!SKB_GSO_TUNNEL_REMCSUM) {
+				kfree_skb(skb);
+				err = -EOPNOTSUPP;
+				goto err;
+			}
+		}
+	}
+
+	skb_scrub_packet(skb, xnet);
+
+	min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
+			+ VXLAN_HLEN + sizeof(struct ipv6hdr)
+			+ (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
+
+	/* Need space for new headers (invalidates iph ptr) */
+	err = skb_cow_head(skb, min_headroom);
+	if (unlikely(err)) {
+		kfree_skb(skb);
+		goto err;
+	}
+
+	skb = vlan_hwaccel_push_inside(skb);
+	if (WARN_ON(!skb)) {
+		err = -ENOMEM;
+		goto err;
+	}
+
+	skb = udp_tunnel_handle_offloads(skb, udp_sum, type, true);
+	if (IS_ERR(skb)) {
+		err = -EINVAL;
+		goto err;
+	}
+
+	vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
+	vxh->vx_flags = htonl(VXLAN_HF_VNI);
+	vxh->vx_vni = vni;
+
+	if (type & SKB_GSO_TUNNEL_REMCSUM) {
+		u16 hdrlen = sizeof(struct vxlanhdr);
+		u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
+			   VXLAN_RCO_SHIFT;
+
+		if (skb->csum_offset == offsetof(struct udphdr, check))
+			data |= VXLAN_RCO_UDP;
+
+		vxh->vx_vni |= htonl(data);
+		vxh->vx_flags |= htonl(VXLAN_HF_RCO);
+
+		if (!skb_is_gso(skb)) {
+			skb->ip_summed = CHECKSUM_NONE;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0)
+			skb->encapsulation = 0;
+#endif
+		}
+	}
+
+	if (vxflags & VXLAN_F_GBP)
+		vxlan_build_gbp_hdr(vxh, vxflags, md);
+
+	ovs_skb_set_inner_protocol(skb, htons(ETH_P_TEB));
+
+	udp_tunnel6_xmit_skb(dst, sk, skb, dev, saddr, daddr, prio,
+			     ttl, src_port, dst_port,
+			     !!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
+	return 0;
+err:
+	dst_release(dst);
+	return err;
+}
+#endif
+
+static int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
+			  __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
+			  __be16 src_port, __be16 dst_port, __be32 vni,
+			  struct vxlan_metadata *md, bool xnet, u32 vxflags)
 {
 	struct vxlanhdr *vxh;
 	int min_headroom;
 	int err;
 	bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
+	int type = 0;
+
+	if ((vxflags & VXLAN_F_REMCSUM_TX) &&
+	    skb->ip_summed == CHECKSUM_PARTIAL) {
+		int csum_start = skb_checksum_start_offset(skb);
+
+		if (csum_start <= VXLAN_MAX_REMCSUM_START &&
+		    !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
+		    (skb->csum_offset == offsetof(struct udphdr, check) ||
+		     skb->csum_offset == offsetof(struct tcphdr, check))) {
+			udp_sum = false;
+			type |= SKB_GSO_TUNNEL_REMCSUM;
+
+			if (!SKB_GSO_TUNNEL_REMCSUM) {
+				kfree_skb(skb);
+				return -EOPNOTSUPP;
+			}
+		}
+	}
 
 	min_headroom = LL_RESERVED_SPACE(rt_dst(rt).dev) + rt_dst(rt).header_len
 			+ VXLAN_HLEN + sizeof(struct iphdr)
@@ -205,28 +1169,601 @@ int rpl_vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
 	if (WARN_ON(!skb))
 		return -ENOMEM;
 
-	skb = udp_tunnel_handle_offloads(skb, udp_sum, true);
+	skb = udp_tunnel_handle_offloads(skb, udp_sum, type, true);
 	if (IS_ERR(skb))
 		return PTR_ERR(skb);
 
 	vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
 	vxh->vx_flags = htonl(VXLAN_HF_VNI);
-	vxh->vx_vni = md->vni;
+	vxh->vx_vni = vni;
+
+	if (type & SKB_GSO_TUNNEL_REMCSUM) {
+		u16 hdrlen = sizeof(struct vxlanhdr);
+		u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
+			   VXLAN_RCO_SHIFT;
+
+		if (skb->csum_offset == offsetof(struct udphdr, check))
+			data |= VXLAN_RCO_UDP;
+
+		vxh->vx_vni |= htonl(data);
+		vxh->vx_flags |= htonl(VXLAN_HF_RCO);
 
+		if (!skb_is_gso(skb)) {
+			skb->ip_summed = CHECKSUM_NONE;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0)
+			skb->encapsulation = 0;
+#endif
+		}
+	}
 	if (vxflags & VXLAN_F_GBP)
 		vxlan_build_gbp_hdr(vxh, vxflags, md);
 
-	vxlan_set_owner(sk, skb);
-
 	ovs_skb_set_inner_protocol(skb, htons(ETH_P_TEB));
 
 	return udp_tunnel_xmit_skb(rt, sk, skb, src, dst, tos,
 				   ttl, df, src_port, dst_port, xnet,
-				   !udp_sum);
+				   !(vxflags & VXLAN_F_UDP_CSUM));
+}
+
+static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
+			   struct vxlan_rdst *rdst, bool did_rsc)
+{
+	struct ip_tunnel_info *info;
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	struct sock *sk = vxlan->vn_sock->sock->sk;
+	unsigned short family = vxlan_get_sk_family(vxlan->vn_sock);
+	struct rtable *rt = NULL;
+	const struct iphdr *old_iph;
+	struct flowi4 fl4;
+	union vxlan_addr *dst;
+	union vxlan_addr remote_ip;
+	struct vxlan_metadata _md;
+	struct vxlan_metadata *md = &_md;
+	__be16 src_port = 0, dst_port;
+	u32 vni;
+	__be16 df = 0;
+	__u8 tos, ttl;
+	int err;
+	u32 flags = vxlan->flags;
+
+	info = skb_tunnel_info(skb);
+
+	if (rdst) {
+		dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
+		vni = rdst->remote_vni;
+		dst = &rdst->remote_ip;
+	} else {
+		if (!info) {
+			WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
+				  dev->name);
+			goto drop;
+		}
+		if (family != ip_tunnel_info_af(info))
+			goto drop;
+
+		dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
+		vni = be64_to_cpu(info->key.tun_id);
+		remote_ip.sa.sa_family = family;
+		if (family == AF_INET)
+			remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
+		else
+			remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
+		dst = &remote_ip;
+	}
+
+	if (vxlan_addr_any(dst)) {
+		if (did_rsc) {
+			/* short-circuited back to local bridge */
+			WARN_ONCE(1, "%s: vxlan_encap_bypass not supported\n",
+				  dev->name);
+		}
+		goto drop;
+	}
+
+	old_iph = ip_hdr(skb);
+
+	ttl = vxlan->cfg.ttl;
+	if (!ttl && vxlan_addr_multicast(dst))
+		ttl = 1;
+
+	tos = vxlan->cfg.tos;
+	if (tos == 1)
+		tos = ip_tunnel_get_dsfield(old_iph, skb);
+
+	src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
+				     vxlan->cfg.port_max, true);
+
+	if (info) {
+		if (info->key.tun_flags & TUNNEL_CSUM)
+			flags |= VXLAN_F_UDP_CSUM;
+		else
+			flags &= ~VXLAN_F_UDP_CSUM;
+
+		ttl = info->key.ttl;
+		tos = info->key.tos;
+
+		if (info->options_len)
+			md = ip_tunnel_info_opts(info);
+	} else {
+		md->gbp = skb->mark;
+	}
+
+	if (dst->sa.sa_family == AF_INET) {
+		if (info && (info->key.tun_flags & TUNNEL_DONT_FRAGMENT))
+			df = htons(IP_DF);
+
+		memset(&fl4, 0, sizeof(fl4));
+		fl4.flowi4_oif = rdst ? rdst->remote_ifindex : 0;
+		fl4.flowi4_tos = RT_TOS(tos);
+		fl4.flowi4_mark = skb->mark;
+		fl4.flowi4_proto = IPPROTO_UDP;
+		fl4.daddr = dst->sin.sin_addr.s_addr;
+		fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
+
+		rt = ip_route_output_key(vxlan->net, &fl4);
+		if (IS_ERR(rt)) {
+			netdev_dbg(dev, "no route to %pI4\n",
+				   &dst->sin.sin_addr.s_addr);
+			dev->stats.tx_carrier_errors++;
+			goto tx_error;
+		}
+
+		if (rt_dst(rt).dev == dev) {
+			netdev_dbg(dev, "circular route to %pI4\n",
+				   &dst->sin.sin_addr.s_addr);
+			dev->stats.collisions++;
+			goto rt_tx_error;
+		}
+
+		/* Bypass encapsulation if the destination is local */
+		if (rt->rt_flags & RTCF_LOCAL &&
+		    !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
+			struct vxlan_dev *dst_vxlan;
+
+			ip_rt_put(rt);
+			dst_vxlan = vxlan_find_vni(vxlan->net, vni,
+						   dst->sa.sa_family, dst_port,
+						   vxlan->flags);
+			if (!dst_vxlan)
+				goto tx_error;
+			WARN_ONCE(1, "%s: vxlan_encap_bypass not supported\n",
+				  dev->name);
+			goto tx_error;
+		}
+
+		tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
+		ttl = ttl ? : ip4_dst_hoplimit(&rt_dst(rt));
+		err = vxlan_xmit_skb(rt, sk, skb, fl4.saddr,
+				     dst->sin.sin_addr.s_addr, tos, ttl, df,
+				     src_port, dst_port, htonl(vni << 8), md,
+				     !net_eq(vxlan->net, dev_net(vxlan->dev)),
+				     flags);
+		if (err < 0) {
+			/* skb is already freed. */
+			skb = NULL;
+			goto rt_tx_error;
+		}
+
+		iptunnel_xmit_stats(err, &dev->stats, (struct pcpu_sw_netstats __percpu *)dev->tstats);
+#if IS_ENABLED(CONFIG_IPV6)
+	} else {
+		struct dst_entry *ndst;
+		struct flowi6 fl6;
+		u32 rt6i_flags;
+
+		memset(&fl6, 0, sizeof(fl6));
+		fl6.flowi6_oif = rdst ? rdst->remote_ifindex : 0;
+		fl6.daddr = dst->sin6.sin6_addr;
+		fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
+		fl6.flowi6_mark = skb->mark;
+		fl6.flowi6_proto = IPPROTO_UDP;
+
+#ifdef HAVE_IPV6_DST_LOOKUP_NET
+		if (ipv6_stub->ipv6_dst_lookup(vxlan->net, sk, &ndst, &fl6)) {
+#else
+#ifdef HAVE_IPV6_STUB
+		if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
+#else
+		ndst = ip6_route_output(vxlan->net, sk, &fl6);
+		if (ndst->error) {
+#endif
+#endif
+			netdev_dbg(dev, "no route to %pI6\n",
+				   &dst->sin6.sin6_addr);
+			dev->stats.tx_carrier_errors++;
+			goto tx_error;
+		}
+
+		if (ndst->dev == dev) {
+			netdev_dbg(dev, "circular route to %pI6\n",
+				   &dst->sin6.sin6_addr);
+			dst_release(ndst);
+			dev->stats.collisions++;
+			goto tx_error;
+		}
+
+		/* Bypass encapsulation if the destination is local */
+		rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
+		if (rt6i_flags & RTF_LOCAL &&
+		    !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
+			struct vxlan_dev *dst_vxlan;
+
+			dst_release(ndst);
+			dst_vxlan = vxlan_find_vni(vxlan->net, vni,
+						   dst->sa.sa_family, dst_port,
+						   vxlan->flags);
+			if (!dst_vxlan)
+				goto tx_error;
+			WARN_ONCE(1, "%s: vxlan_encap_bypass not supported\n",
+				  dev->name);
+			goto tx_error;
+		}
+
+		ttl = ttl ? : ip6_dst_hoplimit(ndst);
+		err = vxlan6_xmit_skb(ndst, sk, skb, dev, &fl6.saddr, &fl6.daddr,
+				      0, ttl, src_port, dst_port, htonl(vni << 8), md,
+				      !net_eq(vxlan->net, dev_net(vxlan->dev)),
+				      flags);
+#endif
+	}
+
+	return;
+
+drop:
+	dev->stats.tx_dropped++;
+	goto tx_free;
+
+rt_tx_error:
+	ip_rt_put(rt);
+tx_error:
+	dev->stats.tx_errors++;
+tx_free:
+	dev_kfree_skb(skb);
+}
+
+/* Transmit local packets over Vxlan
+ *
+ * Outer IP header inherits ECN and DF from inner header.
+ * Outer UDP destination is the VXLAN assigned port.
+ *           source port is based on hash of flow
+ */
+netdev_tx_t rpl_vxlan_xmit(struct sk_buff *skb)
+{
+	struct net_device *dev = skb->dev;
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	const struct ip_tunnel_info *info;
+
+	info = skb_tunnel_info(skb);
+
+	skb_reset_mac_header(skb);
+
+	if ((vxlan->flags & VXLAN_F_PROXY))
+		goto out;
+
+	if (vxlan->flags & VXLAN_F_COLLECT_METADATA &&
+	    info && info->mode & IP_TUNNEL_INFO_TX) {
+		vxlan_xmit_one(skb, dev, NULL, false);
+		return NETDEV_TX_OK;
+	}
+out:
+	pr_warn("vxlan: unsupported flag set %x", vxlan->flags);
+	kfree_skb(skb);
+	return NETDEV_TX_OK;
+}
+EXPORT_SYMBOL(rpl_vxlan_xmit);
+
+/* Walk the forwarding table and purge stale entries */
+static void vxlan_cleanup(unsigned long arg)
+{
+	struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
+	unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
+	unsigned int h;
+
+	if (!netif_running(vxlan->dev))
+		return;
+
+	for (h = 0; h < FDB_HASH_SIZE; ++h) {
+		struct hlist_node *p, *n;
+
+		spin_lock_bh(&vxlan->hash_lock);
+		hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
+			struct vxlan_fdb *f
+				= container_of(p, struct vxlan_fdb, hlist);
+			unsigned long timeout;
+
+			if (f->state & NUD_PERMANENT)
+				continue;
+
+			timeout = f->used + vxlan->cfg.age_interval * HZ;
+			if (time_before_eq(timeout, jiffies)) {
+				netdev_dbg(vxlan->dev,
+					   "garbage collect %pM\n",
+					   f->eth_addr);
+				f->state = NUD_STALE;
+				vxlan_fdb_destroy(vxlan, f);
+			} else if (time_before(timeout, next_timer))
+				next_timer = timeout;
+		}
+		spin_unlock_bh(&vxlan->hash_lock);
+	}
+
+	mod_timer(&vxlan->age_timer, next_timer);
 }
-EXPORT_SYMBOL_GPL(rpl_vxlan_xmit_skb);
 
-static void rcu_free_vs(struct rcu_head *rcu)
+static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
+{
+	struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
+	__u32 vni = vxlan->default_dst.remote_vni;
+
+	vxlan->vn_sock = vs;
+	spin_lock(&vn->sock_lock);
+	hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
+	spin_unlock(&vn->sock_lock);
+}
+
+/* Setup stats when device is created */
+#ifdef HAVE_DEV_TSTATS
+static int vxlan_init(struct net_device *dev)
+{
+	dev->tstats = (typeof(dev->tstats)) netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+	if (!dev->tstats)
+		return -ENOMEM;
+
+	return 0;
+}
+#endif
+
+static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
+{
+	struct vxlan_fdb *f;
+
+	spin_lock_bh(&vxlan->hash_lock);
+	f = __vxlan_find_mac(vxlan, all_zeros_mac);
+	if (f)
+		vxlan_fdb_destroy(vxlan, f);
+	spin_unlock_bh(&vxlan->hash_lock);
+}
+
+#ifdef HAVE_DEV_TSTATS
+static void vxlan_uninit(struct net_device *dev)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+
+	vxlan_fdb_delete_default(vxlan);
+
+	free_percpu(dev->tstats);
+}
+#endif
+
+/* Start ageing timer and join group when device is brought up */
+static int vxlan_open(struct net_device *dev)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	struct vxlan_sock *vs;
+	int ret = 0;
+
+	vs = vxlan_sock_add(vxlan->net, vxlan->cfg.dst_port,
+			    vxlan->cfg.no_share, vxlan->flags);
+	if (IS_ERR(vs))
+		return PTR_ERR(vs);
+
+	vxlan_vs_add_dev(vs, vxlan);
+
+	if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
+		ret = vxlan_igmp_join(vxlan);
+		if (ret == -EADDRINUSE)
+			ret = 0;
+		if (ret) {
+			vxlan_sock_release(vs);
+			return ret;
+		}
+	}
+
+	if (vxlan->cfg.age_interval)
+		mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
+
+	return ret;
+}
+
+/* Purge the forwarding table */
+static void vxlan_flush(struct vxlan_dev *vxlan)
+{
+	unsigned int h;
+
+	spin_lock_bh(&vxlan->hash_lock);
+	for (h = 0; h < FDB_HASH_SIZE; ++h) {
+		struct hlist_node *p, *n;
+
+		hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
+			struct vxlan_fdb *f
+				= container_of(p, struct vxlan_fdb, hlist);
+			/* the all_zeros_mac entry is deleted at vxlan_uninit */
+			if (!is_zero_ether_addr(f->eth_addr))
+				vxlan_fdb_destroy(vxlan, f);
+		}
+	}
+	spin_unlock_bh(&vxlan->hash_lock);
+}
+
+/* Cleanup timer and forwarding table on shutdown */
+static int vxlan_stop(struct net_device *dev)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
+	struct vxlan_sock *vs = vxlan->vn_sock;
+	int ret = 0;
+
+	if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
+	    !vxlan_group_used(vn, vxlan))
+		ret = vxlan_igmp_leave(vxlan);
+
+	del_timer_sync(&vxlan->age_timer);
+
+	vxlan_flush(vxlan);
+	vxlan_sock_release(vs);
+
+	return ret;
+}
+
+/* Stub, nothing needs to be done. */
+static void vxlan_set_multicast_list(struct net_device *dev)
+{
+}
+
+static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	struct vxlan_rdst *dst = &vxlan->default_dst;
+	struct net_device *lowerdev;
+	int max_mtu;
+
+	lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
+	if (lowerdev == NULL)
+		return eth_change_mtu(dev, new_mtu);
+
+	if (dst->remote_ip.sa.sa_family == AF_INET6)
+		max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
+	else
+		max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
+
+	if (new_mtu < 68 || new_mtu > max_mtu)
+		return -EINVAL;
+
+	dev->mtu = new_mtu;
+	return 0;
+}
+
+static netdev_tx_t vxlan_dev_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	/* Drop All packets coming from networking stack. OVS-CB is
+	 * not initialized for these packets.
+	 */
+
+	dev_kfree_skb(skb);
+	dev->stats.tx_dropped++;
+	return NETDEV_TX_OK;
+}
+
+static const struct net_device_ops vxlan_netdev_ops = {
+#ifdef HAVE_DEV_TSTATS
+	.ndo_init		= vxlan_init,
+	.ndo_uninit		= vxlan_uninit,
+	.ndo_get_stats64	= ip_tunnel_get_stats64,
+#endif
+	.ndo_open		= vxlan_open,
+	.ndo_stop		= vxlan_stop,
+	.ndo_start_xmit		= vxlan_dev_xmit,
+	.ndo_set_rx_mode	= vxlan_set_multicast_list,
+	.ndo_change_mtu		= vxlan_change_mtu,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_set_mac_address	= eth_mac_addr,
+};
+
+/* Info for udev, that this is a virtual tunnel endpoint */
+static struct device_type vxlan_type = {
+	.name = "vxlan",
+};
+
+/* Initialize the device structure. */
+static void vxlan_setup(struct net_device *dev)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	unsigned int h;
+
+	eth_hw_addr_random(dev);
+	ether_setup(dev);
+
+	dev->netdev_ops = &vxlan_netdev_ops;
+	dev->destructor = free_netdev;
+	SET_NETDEV_DEVTYPE(dev, &vxlan_type);
+
+	dev->features	|= NETIF_F_LLTX;
+	dev->features	|= NETIF_F_SG | NETIF_F_HW_CSUM;
+	dev->features   |= NETIF_F_RXCSUM;
+	dev->features   |= NETIF_F_GSO_SOFTWARE;
+
+	dev->vlan_features = dev->features;
+	dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
+	dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
+	dev->hw_features |= NETIF_F_GSO_SOFTWARE;
+	dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
+#endif
+
+#if 0
+	netif_keep_dst(dev);
+#endif
+	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
+
+	INIT_LIST_HEAD(&vxlan->next);
+	spin_lock_init(&vxlan->hash_lock);
+
+	init_timer_deferrable(&vxlan->age_timer);
+	vxlan->age_timer.function = vxlan_cleanup;
+	vxlan->age_timer.data = (unsigned long) vxlan;
+
+	vxlan->cfg.dst_port = htons(vxlan_port);
+
+	vxlan->dev = dev;
+
+	for (h = 0; h < FDB_HASH_SIZE; ++h)
+		INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
+}
+
+static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
+	[IFLA_VXLAN_PORT]	= { .type = NLA_U16 },
+};
+
+static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
+{
+	if (tb[IFLA_ADDRESS]) {
+		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
+			pr_debug("invalid link address (not ethernet)\n");
+			return -EINVAL;
+		}
+
+		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
+			pr_debug("invalid all zero ethernet address\n");
+			return -EADDRNOTAVAIL;
+		}
+	}
+
+	if (!data)
+		return -EINVAL;
+
+	if (data[IFLA_VXLAN_ID]) {
+		__u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
+		if (id >= VXLAN_VID_MASK)
+			return -ERANGE;
+	}
+
+	if (data[IFLA_VXLAN_PORT_RANGE]) {
+		const struct ifla_vxlan_port_range *p
+			= nla_data(data[IFLA_VXLAN_PORT_RANGE]);
+
+		if (ntohs(p->high) < ntohs(p->low)) {
+			pr_debug("port range %u .. %u not valid\n",
+				 ntohs(p->low), ntohs(p->high));
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+static void vxlan_get_drvinfo(struct net_device *netdev,
+			      struct ethtool_drvinfo *drvinfo)
+{
+	strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
+	strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
+}
+
+static const struct ethtool_ops vxlan_ethtool_ops = {
+	.get_drvinfo	= vxlan_get_drvinfo,
+	.get_link	= ethtool_op_get_link,
+};
+
+static void free_vs_rcu(struct rcu_head *rcu)
 {
 	struct vxlan_sock *vs = container_of(rcu, struct vxlan_sock, rcu);
 
@@ -236,9 +1773,9 @@ static void rcu_free_vs(struct rcu_head *rcu)
 static void vxlan_del_work(struct work_struct *work)
 {
 	struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
-
 	udp_tunnel_sock_release(vs->sock);
-	call_rcu(&vs->rcu, rcu_free_vs);
+
+	call_rcu(&vs->rcu, free_vs_rcu);
 }
 
 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
@@ -252,13 +1789,11 @@ static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
 
 	if (ipv6) {
 		udp_conf.family = AF_INET6;
-		/* The checksum flag is silently ignored but it
-		 * doesn't make sense here anyways because OVS enables
-		 * checksums on a finer granularity than per-socket.
-		 */
+		udp_conf.use_udp6_rx_checksums =
+		    !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
+		udp_conf.ipv6_v6only = 1;
 	} else {
 		udp_conf.family = AF_INET;
-		udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
 	}
 
 	udp_conf.local_udp_port = port;
@@ -271,32 +1806,51 @@ static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
 	return sock;
 }
 
+/* Create new listen socket if needed */
 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
-					      vxlan_rcv_t *rcv, void *data, u32 flags)
+					      u32 flags)
 {
+	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
 	struct vxlan_sock *vs;
 	struct socket *sock;
+	unsigned int h;
+	bool ipv6 = !!(flags & VXLAN_F_IPV6);
 	struct udp_tunnel_sock_cfg tunnel_cfg;
 
-	vs = kmalloc(sizeof(*vs), GFP_KERNEL);
-	if (!vs) {
-		pr_debug("memory alocation failure\n");
+	vs = kzalloc(sizeof(*vs), GFP_KERNEL);
+	if (!vs)
 		return ERR_PTR(-ENOMEM);
-	}
+
+	for (h = 0; h < VNI_HASH_SIZE; ++h)
+		INIT_HLIST_HEAD(&vs->vni_list[h]);
 
 	INIT_WORK(&vs->del_work, vxlan_del_work);
 
-	sock = vxlan_create_sock(net, false, port, flags);
+	sock = vxlan_create_sock(net, ipv6, port, flags);
 	if (IS_ERR(sock)) {
+		pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
+			PTR_ERR(sock));
 		kfree(vs);
 		return ERR_CAST(sock);
 	}
 
 	vs->sock = sock;
-	vs->rcv = rcv;
-	vs->data = data;
+	atomic_set(&vs->refcnt, 1);
 	vs->flags = (flags & VXLAN_F_RCV_FLAGS);
 
+	/* Initialize the vxlan udp offloads structure */
+#ifdef HAVE_UDP_OFFLOAD
+	vs->udp_offloads.port = port;
+	vs->udp_offloads.callbacks.gro_receive  = vxlan_gro_receive;
+	vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
+	vxlan_notify_add_rx_port(vs);
+#endif
+
+	spin_lock(&vn->sock_lock);
+	hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
+	spin_unlock(&vn->sock_lock);
+
+	/* Mark socket as an encapsulation socket. */
 	tunnel_cfg.sk_user_data = vs;
 	tunnel_cfg.encap_type = 1;
 	tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
@@ -307,20 +1861,378 @@ static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
 	return vs;
 }
 
-struct vxlan_sock *rpl_vxlan_sock_add(struct net *net, __be16 port,
-				      vxlan_rcv_t *rcv, void *data,
-				      bool no_share, u32 flags)
+static struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
+					 bool no_share, u32 flags)
 {
-	return vxlan_socket_create(net, port, rcv, data, flags);
+	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+	struct vxlan_sock *vs;
+	bool ipv6 = flags & VXLAN_F_IPV6;
+
+	if (!no_share) {
+		spin_lock(&vn->sock_lock);
+		vs = vxlan_find_sock(net, ipv6 ? AF_INET6 : AF_INET, port,
+				     flags);
+		if (vs) {
+			if (!atomic_add_unless(&vs->refcnt, 1, 0))
+				vs = ERR_PTR(-EBUSY);
+			spin_unlock(&vn->sock_lock);
+			return vs;
+		}
+		spin_unlock(&vn->sock_lock);
+	}
+
+	return vxlan_socket_create(net, port, flags);
 }
-EXPORT_SYMBOL_GPL(rpl_vxlan_sock_add);
 
-void rpl_vxlan_sock_release(struct vxlan_sock *vs)
+static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
+			       struct vxlan_config *conf)
 {
-	ASSERT_OVSL();
+	struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	struct vxlan_rdst *dst = &vxlan->default_dst;
+	int err;
+	bool use_ipv6 = false;
+	__be16 default_port = vxlan->cfg.dst_port;
+
+	vxlan->net = src_net;
+
+	dst->remote_vni = conf->vni;
+
+	memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
+
+	/* Unless IPv6 is explicitly requested, assume IPv4 */
+	if (!dst->remote_ip.sa.sa_family)
+		dst->remote_ip.sa.sa_family = AF_INET;
+
+	if (dst->remote_ip.sa.sa_family == AF_INET6 ||
+	    vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
+		if (!IS_ENABLED(CONFIG_IPV6))
+			return -EPFNOSUPPORT;
+		use_ipv6 = true;
+	}
+
+	if (conf->remote_ifindex) {
+		struct net_device *lowerdev
+			 = __dev_get_by_index(src_net, conf->remote_ifindex);
+
+		dst->remote_ifindex = conf->remote_ifindex;
+
+		if (!lowerdev) {
+			pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
+			return -ENODEV;
+		}
+
+#if IS_ENABLED(CONFIG_IPV6)
+		if (use_ipv6) {
+			struct inet6_dev *idev = __in6_dev_get(lowerdev);
+			if (idev && idev->cnf.disable_ipv6) {
+				pr_info("IPv6 is disabled via sysctl\n");
+				return -EPERM;
+			}
+			vxlan->flags |= VXLAN_F_IPV6;
+		}
+#endif
 
-	queue_work(system_wq, &vs->del_work);
+		if (!conf->mtu)
+			dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
+
+		dev->needed_headroom = lowerdev->hard_header_len +
+				       (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
+	} else if (use_ipv6) {
+		vxlan->flags |= VXLAN_F_IPV6;
+		dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
+	} else {
+		dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
+	}
+
+	memcpy(&vxlan->cfg, conf, sizeof(*conf));
+	if (!vxlan->cfg.dst_port)
+		vxlan->cfg.dst_port = default_port;
+	vxlan->flags |= conf->flags;
+
+	if (!vxlan->cfg.age_interval)
+		vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
+
+	if (vxlan_find_vni(src_net, conf->vni, use_ipv6 ? AF_INET6 : AF_INET,
+			   vxlan->cfg.dst_port, vxlan->flags))
+		return -EEXIST;
+
+	dev->ethtool_ops = &vxlan_ethtool_ops;
+
+	/* create an fdb entry for a valid default destination */
+	if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
+		err = vxlan_fdb_create(vxlan, all_zeros_mac,
+				       &vxlan->default_dst.remote_ip,
+				       NUD_REACHABLE|NUD_PERMANENT,
+				       NLM_F_EXCL|NLM_F_CREATE,
+				       vxlan->cfg.dst_port,
+				       vxlan->default_dst.remote_vni,
+				       vxlan->default_dst.remote_ifindex,
+				       NTF_SELF);
+		if (err)
+			return err;
+	}
+
+	err = register_netdevice(dev);
+	if (err) {
+		vxlan_fdb_delete_default(vxlan);
+		return err;
+	}
+
+	list_add(&vxlan->next, &vn->vxlan_list);
+
+	return 0;
 }
-EXPORT_SYMBOL_GPL(rpl_vxlan_sock_release);
 
-#endif /* !USE_UPSTREAM_VXLAN */
+struct net_device *rpl_vxlan_dev_create(struct net *net, const char *name,
+				    u8 name_assign_type, struct vxlan_config *conf)
+{
+	struct nlattr *tb[IFLA_MAX+1];
+	struct net_device *dev;
+	int err;
+
+	memset(&tb, 0, sizeof(tb));
+
+	dev = rtnl_create_link(net, (char *)name, name_assign_type,
+			       &vxlan_link_ops, tb);
+	if (IS_ERR(dev))
+		return dev;
+
+	err = vxlan_dev_configure(net, dev, conf);
+	if (err < 0) {
+		free_netdev(dev);
+		return ERR_PTR(err);
+	}
+
+	return dev;
+}
+EXPORT_SYMBOL_GPL(rpl_vxlan_dev_create);
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
+static int vxlan_newlink(struct net *src_net, struct net_device *dev,
+			 struct nlattr *tb[], struct nlattr *data[])
+#else
+static int vxlan_newlink(struct net_device *dev,
+			 struct nlattr *tb[], struct nlattr *data[])
+#endif
+{
+	return -EINVAL;
+}
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
+static void vxlan_dellink(struct net_device *dev, struct list_head *head)
+#else
+static void vxlan_dellink(struct net_device *dev)
+#endif
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
+
+	spin_lock(&vn->sock_lock);
+	if (!hlist_unhashed(&vxlan->hlist))
+		hlist_del_rcu(&vxlan->hlist);
+	spin_unlock(&vn->sock_lock);
+
+	list_del(&vxlan->next);
+	unregister_netdevice_queue(dev, head);
+}
+
+static size_t vxlan_get_size(const struct net_device *dev)
+{
+
+	return nla_total_size(sizeof(__u32)) +	/* IFLA_VXLAN_ID */
+		nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
+		nla_total_size(sizeof(__u32)) +	/* IFLA_VXLAN_LINK */
+		nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
+		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_TTL */
+		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_TOS */
+		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_LEARNING */
+		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_PROXY */
+		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_RSC */
+		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_L2MISS */
+		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_L3MISS */
+		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_COLLECT_METADATA */
+		nla_total_size(sizeof(__u32)) +	/* IFLA_VXLAN_AGEING */
+		nla_total_size(sizeof(__u32)) +	/* IFLA_VXLAN_LIMIT */
+		nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
+		nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
+		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
+		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
+		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
+		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
+		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
+		0;
+}
+
+static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
+{
+	const struct vxlan_dev *vxlan = netdev_priv(dev);
+
+	if (nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port))
+		goto nla_put_failure;
+
+	return 0;
+
+nla_put_failure:
+	return -EMSGSIZE;
+}
+
+#ifdef HAVE_GET_LINK_NET
+static struct net *vxlan_get_link_net(const struct net_device *dev)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+
+	return vxlan->net;
+}
+#endif
+
+static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
+	.kind		= "ovs_vxlan",
+	.maxtype	= IFLA_VXLAN_MAX,
+	.policy		= vxlan_policy,
+	.priv_size	= sizeof(struct vxlan_dev),
+	.setup		= vxlan_setup,
+	.validate	= vxlan_validate,
+	.newlink	= vxlan_newlink,
+	.dellink	= vxlan_dellink,
+	.get_size	= vxlan_get_size,
+	.fill_info	= vxlan_fill_info,
+#ifdef HAVE_GET_LINK_NET
+	.get_link_net	= vxlan_get_link_net,
+#endif
+};
+
+static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
+					     struct net_device *dev)
+{
+	struct vxlan_dev *vxlan, *next;
+	LIST_HEAD(list_kill);
+
+	list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
+		struct vxlan_rdst *dst = &vxlan->default_dst;
+
+		/* In case we created vxlan device with carrier
+		 * and we loose the carrier due to module unload
+		 * we also need to remove vxlan device. In other
+		 * cases, it's not necessary and remote_ifindex
+		 * is 0 here, so no matches.
+		 */
+		if (dst->remote_ifindex == dev->ifindex)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
+			vxlan_dellink(vxlan->dev, &list_kill);
+#else
+			vxlan_dellink(vxlan->dev);
+#endif
+	}
+
+	unregister_netdevice_many(&list_kill);
+}
+
+static int vxlan_lowerdev_event(struct notifier_block *unused,
+				unsigned long event, void *ptr)
+{
+	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+	struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
+
+	if (event == NETDEV_UNREGISTER)
+		vxlan_handle_lowerdev_unregister(vn, dev);
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block vxlan_notifier_block __read_mostly = {
+	.notifier_call = vxlan_lowerdev_event,
+};
+
+static __net_init int vxlan_init_net(struct net *net)
+{
+	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+	unsigned int h;
+
+	INIT_LIST_HEAD(&vn->vxlan_list);
+	spin_lock_init(&vn->sock_lock);
+
+	for (h = 0; h < PORT_HASH_SIZE; ++h)
+		INIT_HLIST_HEAD(&vn->sock_list[h]);
+
+	return 0;
+}
+
+static void __net_exit vxlan_exit_net(struct net *net)
+{
+	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+	struct vxlan_dev *vxlan, *next;
+	struct net_device *dev, *aux;
+	LIST_HEAD(list);
+
+	rtnl_lock();
+	for_each_netdev_safe(net, dev, aux)
+		if (dev->rtnl_link_ops == &vxlan_link_ops)
+			unregister_netdevice_queue(dev, &list);
+
+	list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
+		/* If vxlan->dev is in the same netns, it has already been added
+		 * to the list by the previous loop.
+		 */
+		if (!net_eq(dev_net(vxlan->dev), net))
+			unregister_netdevice_queue(vxlan->dev, &list);
+	}
+
+	unregister_netdevice_many(&list);
+	rtnl_unlock();
+}
+
+static struct pernet_operations vxlan_net_ops = {
+	.init = vxlan_init_net,
+	.exit = vxlan_exit_net,
+	.id   = &vxlan_net_id,
+	.size = sizeof(struct vxlan_net),
+};
+
+DEFINE_COMPAT_PNET_REG_FUNC(device)
+int rpl_vxlan_init_module(void)
+{
+	int rc;
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
+	vxlan_wq = create_workqueue("vxlan");
+#else
+	vxlan_wq = alloc_workqueue("vxlan", 0, 0);
+#endif
+	if (!vxlan_wq)
+		return -ENOMEM;
+
+	get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
+
+	rc = register_pernet_subsys(&vxlan_net_ops);
+	if (rc)
+		goto out1;
+
+	rc = register_netdevice_notifier(&vxlan_notifier_block);
+	if (rc)
+		goto out2;
+
+	rc = rtnl_link_register(&vxlan_link_ops);
+	if (rc)
+		goto out3;
+
+	pr_info("VxLAN tunneling driver\n");
+	return 0;
+out3:
+	unregister_netdevice_notifier(&vxlan_notifier_block);
+out2:
+	unregister_pernet_subsys(&vxlan_net_ops);
+out1:
+	destroy_workqueue(vxlan_wq);
+	return rc;
+}
+
+void rpl_vxlan_cleanup_module(void)
+{
+	rtnl_link_unregister(&vxlan_link_ops);
+	unregister_netdevice_notifier(&vxlan_notifier_block);
+	destroy_workqueue(vxlan_wq);
+	unregister_pernet_subsys(&vxlan_net_ops);
+	/* rcu_barrier() is called by netns */
+}
+#endif