vxlan: move to its own directory

vxlan.c has grown too long. This patch moves
it to its own directory. subsequent patches add new
functionality in new files.

Signed-off-by: Roopa Prabhu <roopa@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 4841 insertions, 0 deletions

diff --git a/drivers/net/vxlan/Makefile b/drivers/net/vxlan/Makefile
new file mode 100644
index 000000000000..567266133593
--- /dev/null
+++ b/drivers/net/vxlan/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the vxlan driver
+#
+
+obj-$(CONFIG_VXLAN) += vxlan.o
+
+vxlan-objs := vxlan_core.o
diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
new file mode 100644
index 000000000000..d0dc90d3dac2
--- /dev/null
+++ b/drivers/net/vxlan/vxlan_core.c
@@ -0,0 +1,4834 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * VXLAN: Virtual eXtensible Local Area Network
+ *
+ * Copyright (c) 2012-2013 Vyatta Inc.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/udp.h>
+#include <linux/igmp.h>
+#include <linux/if_ether.h>
+#include <linux/ethtool.h>
+#include <net/arp.h>
+#include <net/ndisc.h>
+#include <net/gro.h>
+#include <net/ipv6_stubs.h>
+#include <net/ip.h>
+#include <net/icmp.h>
+#include <net/rtnetlink.h>
+#include <net/inet_ecn.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+#include <net/tun_proto.h>
+#include <net/vxlan.h>
+#include <net/nexthop.h>
+
+#if IS_ENABLED(CONFIG_IPV6)
+#include <net/ip6_tunnel.h>
+#include <net/ip6_checksum.h>
+#endif
+
+#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 */
+
+/* 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 bool log_ecn_error = true;
+module_param(log_ecn_error, bool, 0644);
+MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
+
+static unsigned int vxlan_net_id;
+static struct rtnl_link_ops vxlan_link_ops;
+
+static const u8 all_zeros_mac[ETH_ALEN + 2];
+
+static int vxlan_sock_add(struct vxlan_dev *vxlan);
+
+static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
+
+/* 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;
+	struct notifier_block nexthop_notifier_block;
+};
+
+/* 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 */
+	__be32		  vni;
+	u16		  flags;	/* see ndm_flags and below */
+	struct list_head  nh_list;
+	struct nexthop __rcu *nh;
+	struct vxlan_dev  __rcu *vdev;
+};
+
+#define NTF_VXLAN_ADDED_BY_USER 0x100
+
+/* salt for hash table */
+static u32 vxlan_salt __read_mostly;
+
+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 int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
+{
+	if (nla_len(nla) >= sizeof(struct in6_addr)) {
+		ip->sin6.sin6_addr = nla_get_in6_addr(nla);
+		ip->sa.sa_family = AF_INET6;
+		return 0;
+	} else if (nla_len(nla) >= sizeof(__be32)) {
+		ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
+		ip->sa.sa_family = AF_INET;
+		return 0;
+	} else {
+		return -EAFNOSUPPORT;
+	}
+}
+
+static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
+			      const union vxlan_addr *ip)
+{
+	if (ip->sa.sa_family == AF_INET6)
+		return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
+	else
+		return nla_put_in_addr(skb, attr, ip->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 int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
+{
+	if (nla_len(nla) >= sizeof(struct in6_addr)) {
+		return -EAFNOSUPPORT;
+	} else if (nla_len(nla) >= sizeof(__be32)) {
+		ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
+		ip->sa.sa_family = AF_INET;
+		return 0;
+	} else {
+		return -EAFNOSUPPORT;
+	}
+}
+
+static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
+			      const union vxlan_addr *ip)
+{
+	return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
+}
+#endif
+
+/* Virtual Network hash table head */
+static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
+{
+	return &vs->vni_list[hash_32((__force u32)vni, 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)
+{
+	if (rcu_access_pointer(fdb->nh))
+		return NULL;
+	return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
+}
+
+static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
+{
+	if (rcu_access_pointer(fdb->nh))
+		return NULL;
+	return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
+}
+
+/* Find VXLAN socket based on network namespace, address family, UDP port,
+ * enabled unshareable flags and socket device binding (see l3mdev with
+ * non-default VRF).
+ */
+static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
+					  __be16 port, u32 flags, int ifindex)
+{
+	struct vxlan_sock *vs;
+
+	flags &= VXLAN_F_RCV_FLAGS;
+
+	hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
+		if (inet_sk(vs->sock->sk)->inet_sport == port &&
+		    vxlan_get_sk_family(vs) == family &&
+		    vs->flags == flags &&
+		    vs->sock->sk->sk_bound_dev_if == ifindex)
+			return vs;
+	}
+	return NULL;
+}
+
+static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
+					   __be32 vni)
+{
+	struct vxlan_dev_node *node;
+
+	/* For flow based devices, map all packets to VNI 0 */
+	if (vs->flags & VXLAN_F_COLLECT_METADATA)
+		vni = 0;
+
+	hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
+		if (node->vxlan->default_dst.remote_vni != vni)
+			continue;
+
+		if (IS_ENABLED(CONFIG_IPV6)) {
+			const struct vxlan_config *cfg = &node->vxlan->cfg;
+
+			if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
+			    cfg->remote_ifindex != ifindex)
+				continue;
+		}
+
+		return node->vxlan;
+	}
+
+	return NULL;
+}
+
+/* Look up VNI in a per net namespace table */
+static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
+					__be32 vni, sa_family_t family,
+					__be16 port, u32 flags)
+{
+	struct vxlan_sock *vs;
+
+	vs = vxlan_find_sock(net, family, port, flags, ifindex);
+	if (!vs)
+		return NULL;
+
+	return vxlan_vs_find_vni(vs, ifindex, vni);
+}
+
+/* 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)
+{
+	unsigned long now = jiffies;
+	struct nda_cacheinfo ci;
+	bool send_ip, send_eth;
+	struct nlmsghdr *nlh;
+	struct nexthop *nh;
+	struct ndmsg *ndm;
+	int nh_family;
+	u32 nh_id;
+
+	nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
+	if (nlh == NULL)
+		return -EMSGSIZE;
+
+	ndm = nlmsg_data(nlh);
+	memset(ndm, 0, sizeof(*ndm));
+
+	send_eth = send_ip = true;
+
+	rcu_read_lock();
+	nh = rcu_dereference(fdb->nh);
+	if (nh) {
+		nh_family = nexthop_get_family(nh);
+		nh_id = nh->id;
+	}
+	rcu_read_unlock();
+
+	if (type == RTM_GETNEIGH) {
+		if (rdst) {
+			send_ip = !vxlan_addr_any(&rdst->remote_ip);
+			ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
+		} else if (nh) {
+			ndm->ndm_family = nh_family;
+		}
+		send_eth = !is_zero_ether_addr(fdb->eth_addr);
+	} else
+		ndm->ndm_family	= AF_BRIDGE;
+	ndm->ndm_state = fdb->state;
+	ndm->ndm_ifindex = vxlan->dev->ifindex;
+	ndm->ndm_flags = fdb->flags;
+	if (rdst && rdst->offloaded)
+		ndm->ndm_flags |= NTF_OFFLOADED;
+	ndm->ndm_type = RTN_UNICAST;
+
+	if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
+	    nla_put_s32(skb, NDA_LINK_NETNSID,
+			peernet2id(dev_net(vxlan->dev), vxlan->net)))
+		goto nla_put_failure;
+
+	if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
+		goto nla_put_failure;
+	if (nh) {
+		if (nla_put_u32(skb, NDA_NH_ID, nh_id))
+			goto nla_put_failure;
+	} else if (rdst) {
+		if (send_ip && vxlan_nla_put_addr(skb, NDA_DST,
+						  &rdst->remote_ip))
+			goto nla_put_failure;
+
+		if (rdst->remote_port &&
+		    rdst->remote_port != vxlan->cfg.dst_port &&
+		    nla_put_be16(skb, NDA_PORT, rdst->remote_port))
+			goto nla_put_failure;
+		if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
+		    nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
+			goto nla_put_failure;
+		if (rdst->remote_ifindex &&
+		    nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
+			goto nla_put_failure;
+	}
+
+	if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
+	    nla_put_u32(skb, NDA_SRC_VNI,
+			be32_to_cpu(fdb->vni)))
+		goto nla_put_failure;
+
+	ci.ndm_used	 = jiffies_to_clock_t(now - fdb->used);
+	ci.ndm_confirmed = 0;
+	ci.ndm_updated	 = jiffies_to_clock_t(now - fdb->updated);
+	ci.ndm_refcnt	 = 0;
+
+	if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
+		goto nla_put_failure;
+
+	nlmsg_end(skb, nlh);
+	return 0;
+
+nla_put_failure:
+	nlmsg_cancel(skb, nlh);
+	return -EMSGSIZE;
+}
+
+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);
+}
+
+static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan,
+			    const struct vxlan_fdb *fdb,
+			    const struct vxlan_rdst *rd,
+			    struct netlink_ext_ack *extack,
+			    struct switchdev_notifier_vxlan_fdb_info *fdb_info)
+{
+	fdb_info->info.dev = vxlan->dev;
+	fdb_info->info.extack = extack;
+	fdb_info->remote_ip = rd->remote_ip;
+	fdb_info->remote_port = rd->remote_port;
+	fdb_info->remote_vni = rd->remote_vni;
+	fdb_info->remote_ifindex = rd->remote_ifindex;
+	memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN);
+	fdb_info->vni = fdb->vni;
+	fdb_info->offloaded = rd->offloaded;
+	fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER;
+}
+
+static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
+					      struct vxlan_fdb *fdb,
+					      struct vxlan_rdst *rd,
+					      bool adding,
+					      struct netlink_ext_ack *extack)
+{
+	struct switchdev_notifier_vxlan_fdb_info info;
+	enum switchdev_notifier_type notifier_type;
+	int ret;
+
+	if (WARN_ON(!rd))
+		return 0;
+
+	notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
+			       : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
+	vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info);
+	ret = call_switchdev_notifiers(notifier_type, vxlan->dev,
+				       &info.info, extack);
+	return notifier_to_errno(ret);
+}
+
+static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
+			    struct vxlan_rdst *rd, int type, bool swdev_notify,
+			    struct netlink_ext_ack *extack)
+{
+	int err;
+
+	if (swdev_notify && rd) {
+		switch (type) {
+		case RTM_NEWNEIGH:
+			err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
+								 true, extack);
+			if (err)
+				return err;
+			break;
+		case RTM_DELNEIGH:
+			vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
+							   false, extack);
+			break;
+		}
+	}
+
+	__vxlan_fdb_notify(vxlan, fdb, rd, type);
+	return 0;
+}
+
+static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	struct vxlan_fdb f = {
+		.state = NUD_STALE,
+	};
+	struct vxlan_rdst remote = {
+		.remote_ip = *ipa, /* goes to NDA_DST */
+		.remote_vni = cpu_to_be32(VXLAN_N_VID),
+	};
+
+	vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
+}
+
+static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
+{
+	struct vxlan_fdb f = {
+		.state = NUD_STALE,
+	};
+	struct vxlan_rdst remote = { };
+
+	memcpy(f.eth_addr, eth_addr, ETH_ALEN);
+
+	vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
+}
+
+/* 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);
+}
+
+static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
+{
+	/* use 1 byte of OUI and 3 bytes of NIC */
+	u32 key = get_unaligned((u32 *)(addr + 2));
+
+	return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
+}
+
+static u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni)
+{
+	if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
+		return eth_vni_hash(mac, vni);
+	else
+		return eth_hash(mac);
+}
+
+/* Hash chain to use given mac address */
+static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
+						const u8 *mac, __be32 vni)
+{
+	return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)];
+}
+
+/* Look up Ethernet address in forwarding table */
+static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
+					  const u8 *mac, __be32 vni)
+{
+	struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
+	struct vxlan_fdb *f;
+
+	hlist_for_each_entry_rcu(f, head, hlist) {
+		if (ether_addr_equal(mac, f->eth_addr)) {
+			if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
+				if (vni == f->vni)
+					return f;
+			} else {
+				return f;
+			}
+		}
+	}
+
+	return NULL;
+}
+
+static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
+					const u8 *mac, __be32 vni)
+{
+	struct vxlan_fdb *f;
+
+	f = __vxlan_find_mac(vxlan, mac, vni);
+	if (f && f->used != jiffies)
+		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,
+					      __be32 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;
+}
+
+int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
+		      struct switchdev_notifier_vxlan_fdb_info *fdb_info)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	u8 eth_addr[ETH_ALEN + 2] = { 0 };
+	struct vxlan_rdst *rdst;
+	struct vxlan_fdb *f;
+	int rc = 0;
+
+	if (is_multicast_ether_addr(mac) ||
+	    is_zero_ether_addr(mac))
+		return -EINVAL;
+
+	ether_addr_copy(eth_addr, mac);
+
+	rcu_read_lock();
+
+	f = __vxlan_find_mac(vxlan, eth_addr, vni);
+	if (!f) {
+		rc = -ENOENT;
+		goto out;
+	}
+
+	rdst = first_remote_rcu(f);
+	vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info);
+
+out:
+	rcu_read_unlock();
+	return rc;
+}
+EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc);
+
+static int vxlan_fdb_notify_one(struct notifier_block *nb,
+				const struct vxlan_dev *vxlan,
+				const struct vxlan_fdb *f,
+				const struct vxlan_rdst *rdst,
+				struct netlink_ext_ack *extack)
+{
+	struct switchdev_notifier_vxlan_fdb_info fdb_info;
+	int rc;
+
+	vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info);
+	rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
+			       &fdb_info);
+	return notifier_to_errno(rc);
+}
+
+int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
+		     struct notifier_block *nb,
+		     struct netlink_ext_ack *extack)
+{
+	struct vxlan_dev *vxlan;
+	struct vxlan_rdst *rdst;
+	struct vxlan_fdb *f;
+	unsigned int h;
+	int rc = 0;
+
+	if (!netif_is_vxlan(dev))
+		return -EINVAL;
+	vxlan = netdev_priv(dev);
+
+	for (h = 0; h < FDB_HASH_SIZE; ++h) {
+		spin_lock_bh(&vxlan->hash_lock[h]);
+		hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) {
+			if (f->vni == vni) {
+				list_for_each_entry(rdst, &f->remotes, list) {
+					rc = vxlan_fdb_notify_one(nb, vxlan,
+								  f, rdst,
+								  extack);
+					if (rc)
+						goto unlock;
+				}
+			}
+		}
+		spin_unlock_bh(&vxlan->hash_lock[h]);
+	}
+	return 0;
+
+unlock:
+	spin_unlock_bh(&vxlan->hash_lock[h]);
+	return rc;
+}
+EXPORT_SYMBOL_GPL(vxlan_fdb_replay);
+
+void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
+{
+	struct vxlan_dev *vxlan;
+	struct vxlan_rdst *rdst;
+	struct vxlan_fdb *f;
+	unsigned int h;
+
+	if (!netif_is_vxlan(dev))
+		return;
+	vxlan = netdev_priv(dev);
+
+	for (h = 0; h < FDB_HASH_SIZE; ++h) {
+		spin_lock_bh(&vxlan->hash_lock[h]);
+		hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist)
+			if (f->vni == vni)
+				list_for_each_entry(rdst, &f->remotes, list)
+					rdst->offloaded = false;
+		spin_unlock_bh(&vxlan->hash_lock[h]);
+	}
+
+}
+EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload);
+
+/* Replace destination of unicast mac */
+static int vxlan_fdb_replace(struct vxlan_fdb *f,
+			     union vxlan_addr *ip, __be16 port, __be32 vni,
+			     __u32 ifindex, struct vxlan_rdst *oldrd)
+{
+	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;
+
+	*oldrd = *rd;
+	dst_cache_reset(&rd->dst_cache);
+	rd->remote_ip = *ip;
+	rd->remote_port = port;
+	rd->remote_vni = vni;
+	rd->remote_ifindex = ifindex;
+	rd->offloaded = false;
+	return 1;
+}
+
+/* Add/update destinations for multicast */
+static int vxlan_fdb_append(struct vxlan_fdb *f,
+			    union vxlan_addr *ip, __be16 port, __be32 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;
+
+	if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
+		kfree(rd);
+		return -ENOBUFS;
+	}
+
+	rd->remote_ip = *ip;
+	rd->remote_port = port;
+	rd->offloaded = false;
+	rd->remote_vni = vni;
+	rd->remote_ifindex = ifindex;
+
+	list_add_tail_rcu(&rd->list, &f->remotes);
+
+	*rdp = rd;
+	return 1;
+}
+
+static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
+					  unsigned int off,
+					  struct vxlanhdr *vh, size_t hdrlen,
+					  __be32 vni_field,
+					  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 = vxlan_rco_start(vni_field);
+	offset = start + vxlan_rco_offset(vni_field);
+
+	vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
+				     start, offset, grc, nopartial);
+
+	skb->remcsum_offload = 1;
+
+	return vh;
+}
+
+static struct sk_buff *vxlan_gro_receive(struct sock *sk,
+					 struct list_head *head,
+					 struct sk_buff *skb)
+{
+	struct sk_buff *pp = NULL;
+	struct sk_buff *p;
+	struct vxlanhdr *vh, *vh2;
+	unsigned int hlen, off_vx;
+	int flush = 1;
+	struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
+	__be32 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 = vh->vx_flags;
+
+	if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
+		vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
+				       vh->vx_vni, &grc,
+				       !!(vs->flags &
+					  VXLAN_F_REMCSUM_NOPARTIAL));
+
+		if (!vh)
+			goto out;
+	}
+
+	skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
+
+	list_for_each_entry(p, head, list) {
+		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 = call_gro_receive(eth_gro_receive, head, skb);
+	flush = 0;
+
+out:
+	skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
+
+	return pp;
+}
+
+static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
+{
+	/* Sets 'skb->inner_mac_header' since we are always called with
+	 * 'skb->encapsulation' set.
+	 */
+	return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
+}
+
+static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, const u8 *mac,
+					 __u16 state, __be32 src_vni,
+					 __u16 ndm_flags)
+{
+	struct vxlan_fdb *f;
+
+	f = kmalloc(sizeof(*f), GFP_ATOMIC);
+	if (!f)
+		return NULL;
+	f->state = state;
+	f->flags = ndm_flags;
+	f->updated = f->used = jiffies;
+	f->vni = src_vni;
+	f->nh = NULL;
+	RCU_INIT_POINTER(f->vdev, vxlan);
+	INIT_LIST_HEAD(&f->nh_list);
+	INIT_LIST_HEAD(&f->remotes);
+	memcpy(f->eth_addr, mac, ETH_ALEN);
+
+	return f;
+}
+
+static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac,
+			     __be32 src_vni, struct vxlan_fdb *f)
+{
+	++vxlan->addrcnt;
+	hlist_add_head_rcu(&f->hlist,
+			   vxlan_fdb_head(vxlan, mac, src_vni));
+}
+
+static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
+			       u32 nhid, struct netlink_ext_ack *extack)
+{
+	struct nexthop *old_nh = rtnl_dereference(fdb->nh);
+	struct nexthop *nh;
+	int err = -EINVAL;
+
+	if (old_nh && old_nh->id == nhid)
+		return 0;
+
+	nh = nexthop_find_by_id(vxlan->net, nhid);
+	if (!nh) {
+		NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
+		goto err_inval;
+	}
+
+	if (nh) {
+		if (!nexthop_get(nh)) {
+			NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
+			nh = NULL;
+			goto err_inval;
+		}
+		if (!nexthop_is_fdb(nh)) {
+			NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop");
+			goto err_inval;
+		}
+
+		if (!nexthop_is_multipath(nh)) {
+			NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group");
+			goto err_inval;
+		}
+
+		/* check nexthop group family */
+		switch (vxlan->default_dst.remote_ip.sa.sa_family) {
+		case AF_INET:
+			if (!nexthop_has_v4(nh)) {
+				err = -EAFNOSUPPORT;
+				NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
+				goto err_inval;
+			}
+			break;
+		case AF_INET6:
+			if (nexthop_has_v4(nh)) {
+				err = -EAFNOSUPPORT;
+				NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
+				goto err_inval;
+			}
+		}
+	}
+
+	if (old_nh) {
+		list_del_rcu(&fdb->nh_list);
+		nexthop_put(old_nh);
+	}
+	rcu_assign_pointer(fdb->nh, nh);
+	list_add_tail_rcu(&fdb->nh_list, &nh->fdb_list);
+	return 1;
+
+err_inval:
+	if (nh)
+		nexthop_put(nh);
+	return err;
+}
+
+static int vxlan_fdb_create(struct vxlan_dev *vxlan,
+			    const u8 *mac, union vxlan_addr *ip,
+			    __u16 state, __be16 port, __be32 src_vni,
+			    __be32 vni, __u32 ifindex, __u16 ndm_flags,
+			    u32 nhid, struct vxlan_fdb **fdb,
+			    struct netlink_ext_ack *extack)
+{
+	struct vxlan_rdst *rd = NULL;
+	struct vxlan_fdb *f;
+	int rc;
+
+	if (vxlan->cfg.addrmax &&
+	    vxlan->addrcnt >= vxlan->cfg.addrmax)
+		return -ENOSPC;
+
+	netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
+	f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
+	if (!f)
+		return -ENOMEM;
+
+	if (nhid)
+		rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
+	else
+		rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
+	if (rc < 0)
+		goto errout;
+
+	*fdb = f;
+
+	return 0;
+
+errout:
+	kfree(f);
+	return rc;
+}
+
+static void __vxlan_fdb_free(struct vxlan_fdb *f)
+{
+	struct vxlan_rdst *rd, *nd;
+	struct nexthop *nh;
+
+	nh = rcu_dereference_raw(f->nh);
+	if (nh) {
+		rcu_assign_pointer(f->nh, NULL);
+		rcu_assign_pointer(f->vdev, NULL);
+		nexthop_put(nh);
+	}
+
+	list_for_each_entry_safe(rd, nd, &f->remotes, list) {
+		dst_cache_destroy(&rd->dst_cache);
+		kfree(rd);
+	}
+	kfree(f);
+}
+
+static void vxlan_fdb_free(struct rcu_head *head)
+{
+	struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
+
+	__vxlan_fdb_free(f);
+}
+
+static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
+			      bool do_notify, bool swdev_notify)
+{
+	struct vxlan_rdst *rd;
+
+	netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr);
+
+	--vxlan->addrcnt;
+	if (do_notify) {
+		if (rcu_access_pointer(f->nh))
+			vxlan_fdb_notify(vxlan, f, NULL, RTM_DELNEIGH,
+					 swdev_notify, NULL);
+		else
+			list_for_each_entry(rd, &f->remotes, list)
+				vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH,
+						 swdev_notify, NULL);
+	}
+
+	hlist_del_rcu(&f->hlist);
+	list_del_rcu(&f->nh_list);
+	call_rcu(&f->rcu, vxlan_fdb_free);
+}
+
+static void vxlan_dst_free(struct rcu_head *head)
+{
+	struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
+
+	dst_cache_destroy(&rd->dst_cache);
+	kfree(rd);
+}
+
+static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
+				     union vxlan_addr *ip,
+				     __u16 state, __u16 flags,
+				     __be16 port, __be32 vni,
+				     __u32 ifindex, __u16 ndm_flags,
+				     struct vxlan_fdb *f, u32 nhid,
+				     bool swdev_notify,
+				     struct netlink_ext_ack *extack)
+{
+	__u16 fdb_flags = (ndm_flags & ~NTF_USE);
+	struct vxlan_rdst *rd = NULL;
+	struct vxlan_rdst oldrd;
+	int notify = 0;
+	int rc = 0;
+	int err;
+
+	if (nhid && !rcu_access_pointer(f->nh)) {
+		NL_SET_ERR_MSG(extack,
+			       "Cannot replace an existing non nexthop fdb with a nexthop");
+		return -EOPNOTSUPP;
+	}
+
+	if (nhid && (flags & NLM_F_APPEND)) {
+		NL_SET_ERR_MSG(extack,
+			       "Cannot append to a nexthop fdb");
+		return -EOPNOTSUPP;
+	}
+
+	/* Do not allow an externally learned entry to take over an entry added
+	 * by the user.
+	 */
+	if (!(fdb_flags & NTF_EXT_LEARNED) ||
+	    !(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
+		if (f->state != state) {
+			f->state = state;
+			f->updated = jiffies;
+			notify = 1;
+		}
+		if (f->flags != fdb_flags) {
+			f->flags = fdb_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))) {
+			if (nhid) {
+				rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
+				if (rc < 0)
+					return rc;
+			} else {
+				rc = vxlan_fdb_replace(f, ip, port, vni,
+						       ifindex, &oldrd);
+			}
+			notify |= rc;
+		} else {
+			NL_SET_ERR_MSG(extack, "Cannot replace non-unicast fdb entries");
+			return -EOPNOTSUPP;
+		}
+	}
+	if ((flags & NLM_F_APPEND) &&
+	    (is_multicast_ether_addr(f->eth_addr) ||
+	     is_zero_ether_addr(f->eth_addr))) {
+		rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
+
+		if (rc < 0)
+			return rc;
+		notify |= rc;
+	}
+
+	if (ndm_flags & NTF_USE)
+		f->used = jiffies;
+
+	if (notify) {
+		if (rd == NULL)
+			rd = first_remote_rtnl(f);
+
+		err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH,
+				       swdev_notify, extack);
+		if (err)
+			goto err_notify;
+	}
+
+	return 0;
+
+err_notify:
+	if (nhid)
+		return err;
+	if ((flags & NLM_F_REPLACE) && rc)
+		*rd = oldrd;
+	else if ((flags & NLM_F_APPEND) && rc) {
+		list_del_rcu(&rd->list);
+		call_rcu(&rd->rcu, vxlan_dst_free);
+	}
+	return err;
+}
+
+static int vxlan_fdb_update_create(struct vxlan_dev *vxlan,
+				   const u8 *mac, union vxlan_addr *ip,
+				   __u16 state, __u16 flags,
+				   __be16 port, __be32 src_vni, __be32 vni,
+				   __u32 ifindex, __u16 ndm_flags, u32 nhid,
+				   bool swdev_notify,
+				   struct netlink_ext_ack *extack)
+{
+	__u16 fdb_flags = (ndm_flags & ~NTF_USE);
+	struct vxlan_fdb *f;
+	int rc;
+
+	/* 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);
+	rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
+			      vni, ifindex, fdb_flags, nhid, &f, extack);
+	if (rc < 0)
+		return rc;
+
+	vxlan_fdb_insert(vxlan, mac, src_vni, f);
+	rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
+			      swdev_notify, extack);
+	if (rc)
+		goto err_notify;
+
+	return 0;
+
+err_notify:
+	vxlan_fdb_destroy(vxlan, f, false, false);
+	return rc;
+}
+
+/* Add new entry to forwarding table -- assumes lock held */
+static int vxlan_fdb_update(struct vxlan_dev *vxlan,
+			    const u8 *mac, union vxlan_addr *ip,
+			    __u16 state, __u16 flags,
+			    __be16 port, __be32 src_vni, __be32 vni,
+			    __u32 ifindex, __u16 ndm_flags, u32 nhid,
+			    bool swdev_notify,
+			    struct netlink_ext_ack *extack)
+{
+	struct vxlan_fdb *f;
+
+	f = __vxlan_find_mac(vxlan, mac, src_vni);
+	if (f) {
+		if (flags & NLM_F_EXCL) {
+			netdev_dbg(vxlan->dev,
+				   "lost race to create %pM\n", mac);
+			return -EEXIST;
+		}
+
+		return vxlan_fdb_update_existing(vxlan, ip, state, flags, port,
+						 vni, ifindex, ndm_flags, f,
+						 nhid, swdev_notify, extack);
+	} else {
+		if (!(flags & NLM_F_CREATE))
+			return -ENOENT;
+
+		return vxlan_fdb_update_create(vxlan, mac, ip, state, flags,
+					       port, src_vni, vni, ifindex,
+					       ndm_flags, nhid, swdev_notify,
+					       extack);
+	}
+}
+
+static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
+				  struct vxlan_rdst *rd, bool swdev_notify)
+{
+	list_del_rcu(&rd->list);
+	vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL);
+	call_rcu(&rd->rcu, vxlan_dst_free);
+}
+
+static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
+			   union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
+			   __be32 *vni, u32 *ifindex, u32 *nhid)
+{
+	struct net *net = dev_net(vxlan->dev);
+	int err;
+
+	if (tb[NDA_NH_ID] && (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] ||
+	    tb[NDA_PORT]))
+		return -EINVAL;
+
+	if (tb[NDA_DST]) {
+		err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
+		if (err)
+			return err;
+	} else {
+		union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
+
+		if (remote->sa.sa_family == AF_INET) {
+			ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
+			ip->sa.sa_family = AF_INET;
+#if IS_ENABLED(CONFIG_IPV6)
+		} else {
+			ip->sin6.sin6_addr = in6addr_any;
+			ip->sa.sa_family = AF_INET6;
+#endif
+		}
+	}
+
+	if (tb[NDA_PORT]) {
+		if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
+			return -EINVAL;
+		*port = nla_get_be16(tb[NDA_PORT]);
+	} else {
+		*port = vxlan->cfg.dst_port;
+	}
+
+	if (tb[NDA_VNI]) {
+		if (nla_len(tb[NDA_VNI]) != sizeof(u32))
+			return -EINVAL;
+		*vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
+	} else {
+		*vni = vxlan->default_dst.remote_vni;
+	}
+
+	if (tb[NDA_SRC_VNI]) {
+		if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
+			return -EINVAL;
+		*src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
+	} else {
+		*src_vni = vxlan->default_dst.remote_vni;
+	}
+
+	if (tb[NDA_IFINDEX]) {
+		struct net_device *tdev;
+
+		if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
+			return -EINVAL;
+		*ifindex = nla_get_u32(tb[NDA_IFINDEX]);
+		tdev = __dev_get_by_index(net, *ifindex);
+		if (!tdev)
+			return -EADDRNOTAVAIL;
+	} else {
+		*ifindex = 0;
+	}
+
+	if (tb[NDA_NH_ID])
+		*nhid = nla_get_u32(tb[NDA_NH_ID]);
+	else
+		*nhid = 0;
+
+	return 0;
+}
+
+/* Add static entry (via netlink) */
+static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
+			 struct net_device *dev,
+			 const unsigned char *addr, u16 vid, u16 flags,
+			 struct netlink_ext_ack *extack)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	/* struct net *net = dev_net(vxlan->dev); */
+	union vxlan_addr ip;
+	__be16 port;
+	__be32 src_vni, vni;
+	u32 ifindex, nhid;
+	u32 hash_index;
+	int err;
+
+	if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
+		pr_info("RTM_NEWNEIGH with invalid state %#x\n",
+			ndm->ndm_state);
+		return -EINVAL;
+	}
+
+	if (!tb || (!tb[NDA_DST] && !tb[NDA_NH_ID]))
+		return -EINVAL;
+
+	err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
+			      &nhid);
+	if (err)
+		return err;
+
+	if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
+		return -EAFNOSUPPORT;
+
+	hash_index = fdb_head_index(vxlan, addr, src_vni);
+	spin_lock_bh(&vxlan->hash_lock[hash_index]);
+	err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
+			       port, src_vni, vni, ifindex,
+			       ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER,
+			       nhid, true, extack);
+	spin_unlock_bh(&vxlan->hash_lock[hash_index]);
+
+	return err;
+}
+
+static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
+			      const unsigned char *addr, union vxlan_addr ip,
+			      __be16 port, __be32 src_vni, __be32 vni,
+			      u32 ifindex, bool swdev_notify)
+{
+	struct vxlan_rdst *rd = NULL;
+	struct vxlan_fdb *f;
+	int err = -ENOENT;
+
+	f = vxlan_find_mac(vxlan, addr, src_vni);
+	if (!f)
+		return err;
+
+	if (!vxlan_addr_any(&ip)) {
+		rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
+		if (!rd)
+			goto out;
+	}
+
+	/* remove a destination if it's not the only one on the list,
+	 * otherwise destroy the fdb entry
+	 */
+	if (rd && !list_is_singular(&f->remotes)) {
+		vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify);
+		goto out;
+	}
+
+	vxlan_fdb_destroy(vxlan, f, true, swdev_notify);
+
+out:
+	return 0;
+}
+
+/* Delete entry (via netlink) */
+static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
+			    struct net_device *dev,
+			    const unsigned char *addr, u16 vid)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	union vxlan_addr ip;
+	__be32 src_vni, vni;
+	u32 ifindex, nhid;
+	u32 hash_index;
+	__be16 port;
+	int err;
+
+	err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
+			      &nhid);
+	if (err)
+		return err;
+
+	hash_index = fdb_head_index(vxlan, addr, src_vni);
+	spin_lock_bh(&vxlan->hash_lock[hash_index]);
+	err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
+				 true);
+	spin_unlock_bh(&vxlan->hash_lock[hash_index]);
+
+	return err;
+}
+
+/* Dump forwarding table */
+static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
+			  struct net_device *dev,
+			  struct net_device *filter_dev, int *idx)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	unsigned int h;
+	int err = 0;
+
+	for (h = 0; h < FDB_HASH_SIZE; ++h) {
+		struct vxlan_fdb *f;
+
+		rcu_read_lock();
+		hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
+			struct vxlan_rdst *rd;
+
+			if (rcu_access_pointer(f->nh)) {
+				if (*idx < cb->args[2])
+					goto skip_nh;
+				err = vxlan_fdb_info(skb, vxlan, f,
+						     NETLINK_CB(cb->skb).portid,
+						     cb->nlh->nlmsg_seq,
+						     RTM_NEWNEIGH,
+						     NLM_F_MULTI, NULL);
+				if (err < 0) {
+					rcu_read_unlock();
+					goto out;
+				}
+skip_nh:
+				*idx += 1;
+				continue;
+			}
+
+			list_for_each_entry_rcu(rd, &f->remotes, list) {
+				if (*idx < cb->args[2])
+					goto skip;
+
+				err = vxlan_fdb_info(skb, vxlan, f,
+						     NETLINK_CB(cb->skb).portid,
+						     cb->nlh->nlmsg_seq,
+						     RTM_NEWNEIGH,
+						     NLM_F_MULTI, rd);
+				if (err < 0) {
+					rcu_read_unlock();
+					goto out;
+				}
+skip:
+				*idx += 1;
+			}
+		}
+		rcu_read_unlock();
+	}
+out:
+	return err;
+}
+
+static int vxlan_fdb_get(struct sk_buff *skb,
+			 struct nlattr *tb[],
+			 struct net_device *dev,
+			 const unsigned char *addr,
+			 u16 vid, u32 portid, u32 seq,
+			 struct netlink_ext_ack *extack)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	struct vxlan_fdb *f;
+	__be32 vni;
+	int err;
+
+	if (tb[NDA_VNI])
+		vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
+	else
+		vni = vxlan->default_dst.remote_vni;
+
+	rcu_read_lock();
+
+	f = __vxlan_find_mac(vxlan, addr, vni);
+	if (!f) {
+		NL_SET_ERR_MSG(extack, "Fdb entry not found");
+		err = -ENOENT;
+		goto errout;
+	}
+
+	err = vxlan_fdb_info(skb, vxlan, f, portid, seq,
+			     RTM_NEWNEIGH, 0, first_remote_rcu(f));
+errout:
+	rcu_read_unlock();
+	return err;
+}
+
+/* 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,
+			u32 src_ifindex, __be32 vni)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	struct vxlan_fdb *f;
+	u32 ifindex = 0;
+
+#if IS_ENABLED(CONFIG_IPV6)
+	if (src_ip->sa.sa_family == AF_INET6 &&
+	    (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
+		ifindex = src_ifindex;
+#endif
+
+	f = vxlan_find_mac(vxlan, src_mac, vni);
+	if (likely(f)) {
+		struct vxlan_rdst *rdst = first_remote_rcu(f);
+
+		if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
+			   rdst->remote_ifindex == ifindex))
+			return false;
+
+		/* Don't migrate static entries, drop packets */
+		if (f->state & (NUD_PERMANENT | NUD_NOARP))
+			return true;
+
+		/* Don't override an fdb with nexthop with a learnt entry */
+		if (rcu_access_pointer(f->nh))
+			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, true, NULL);
+	} else {
+		u32 hash_index = fdb_head_index(vxlan, src_mac, vni);
+
+		/* learned new entry */
+		spin_lock(&vxlan->hash_lock[hash_index]);
+
+		/* close off race between vxlan_flush and incoming packets */
+		if (netif_running(dev))
+			vxlan_fdb_update(vxlan, src_mac, src_ip,
+					 NUD_REACHABLE,
+					 NLM_F_EXCL|NLM_F_CREATE,
+					 vxlan->cfg.dst_port,
+					 vni,
+					 vxlan->default_dst.remote_vni,
+					 ifindex, NTF_SELF, 0, true, NULL);
+		spin_unlock(&vxlan->hash_lock[hash_index]);
+	}
+
+	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;
+	struct vxlan_sock *sock4;
+#if IS_ENABLED(CONFIG_IPV6)
+	struct vxlan_sock *sock6;
+#endif
+	unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
+
+	sock4 = rtnl_dereference(dev->vn4_sock);
+
+	/* The vxlan_sock is only used by dev, leaving group has
+	 * no effect on other vxlan devices.
+	 */
+	if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
+		return false;
+#if IS_ENABLED(CONFIG_IPV6)
+	sock6 = rtnl_dereference(dev->vn6_sock);
+	if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
+		return false;
+#endif
+
+	list_for_each_entry(vxlan, &vn->vxlan_list, next) {
+		if (!netif_running(vxlan->dev) || vxlan == dev)
+			continue;
+
+		if (family == AF_INET &&
+		    rtnl_dereference(vxlan->vn4_sock) != sock4)
+			continue;
+#if IS_ENABLED(CONFIG_IPV6)
+		if (family == AF_INET6 &&
+		    rtnl_dereference(vxlan->vn6_sock) != sock6)
+			continue;
+#endif
+
+		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 bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
+{
+	struct vxlan_net *vn;
+
+	if (!vs)
+		return false;
+	if (!refcount_dec_and_test(&vs->refcnt))
+		return false;
+
+	vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
+	spin_lock(&vn->sock_lock);
+	hlist_del_rcu(&vs->hlist);
+	udp_tunnel_notify_del_rx_port(vs->sock,
+				      (vs->flags & VXLAN_F_GPE) ?
+				      UDP_TUNNEL_TYPE_VXLAN_GPE :
+				      UDP_TUNNEL_TYPE_VXLAN);
+	spin_unlock(&vn->sock_lock);
+
+	return true;
+}
+
+static void vxlan_sock_release(struct vxlan_dev *vxlan)
+{
+	struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
+#if IS_ENABLED(CONFIG_IPV6)
+	struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
+
+	RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
+#endif
+
+	RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
+	synchronize_net();
+
+	vxlan_vs_del_dev(vxlan);
+
+	if (__vxlan_sock_release_prep(sock4)) {
+		udp_tunnel_sock_release(sock4->sock);
+		kfree(sock4);
+	}
+
+#if IS_ENABLED(CONFIG_IPV6)
+	if (__vxlan_sock_release_prep(sock6)) {
+		udp_tunnel_sock_release(sock6->sock);
+		kfree(sock6);
+	}
+#endif
+}
+
+/* Update multicast group membership when first VNI on
+ * multicast address is brought up
+ */
+static int vxlan_igmp_join(struct vxlan_dev *vxlan)
+{
+	struct sock *sk;
+	union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
+	int ifindex = vxlan->default_dst.remote_ifindex;
+	int ret = -EINVAL;
+
+	if (ip->sa.sa_family == AF_INET) {
+		struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
+		struct ip_mreqn mreq = {
+			.imr_multiaddr.s_addr	= ip->sin.sin_addr.s_addr,
+			.imr_ifindex		= ifindex,
+		};
+
+		sk = sock4->sock->sk;
+		lock_sock(sk);
+		ret = ip_mc_join_group(sk, &mreq);
+		release_sock(sk);
+#if IS_ENABLED(CONFIG_IPV6)
+	} else {
+		struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
+
+		sk = sock6->sock->sk;
+		lock_sock(sk);
+		ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
+						   &ip->sin6.sin6_addr);
+		release_sock(sk);
+#endif
+	}
+
+	return ret;
+}
+
+/* Inverse of vxlan_igmp_join when last VNI is brought down */
+static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
+{
+	struct sock *sk;
+	union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
+	int ifindex = vxlan->default_dst.remote_ifindex;
+	int ret = -EINVAL;
+
+	if (ip->sa.sa_family == AF_INET) {
+		struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
+		struct ip_mreqn mreq = {
+			.imr_multiaddr.s_addr	= ip->sin.sin_addr.s_addr,
+			.imr_ifindex		= ifindex,
+		};
+
+		sk = sock4->sock->sk;
+		lock_sock(sk);
+		ret = ip_mc_leave_group(sk, &mreq);
+		release_sock(sk);
+#if IS_ENABLED(CONFIG_IPV6)
+	} else {
+		struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
+
+		sk = sock6->sock->sk;
+		lock_sock(sk);
+		ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
+						   &ip->sin6.sin6_addr);
+		release_sock(sk);
+#endif
+	}
+
+	return ret;
+}
+
+static bool vxlan_remcsum(struct vxlanhdr *unparsed,
+			  struct sk_buff *skb, u32 vxflags)
+{
+	size_t start, offset;
+
+	if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
+		goto out;
+
+	start = vxlan_rco_start(unparsed->vx_vni);
+	offset = start + vxlan_rco_offset(unparsed->vx_vni);
+
+	if (!pskb_may_pull(skb, offset + sizeof(u16)))
+		return false;
+
+	skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
+			    !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
+out:
+	unparsed->vx_flags &= ~VXLAN_HF_RCO;
+	unparsed->vx_vni &= VXLAN_VNI_MASK;
+	return true;
+}
+
+static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
+				struct sk_buff *skb, u32 vxflags,
+				struct vxlan_metadata *md)
+{
+	struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
+	struct metadata_dst *tun_dst;
+
+	if (!(unparsed->vx_flags & VXLAN_HF_GBP))
+		goto out;
+
+	md->gbp = ntohs(gbp->policy_id);
+
+	tun_dst = (struct metadata_dst *)skb_dst(skb);
+	if (tun_dst) {
+		tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
+		tun_dst->u.tun_info.options_len = sizeof(*md);
+	}
+	if (gbp->dont_learn)
+		md->gbp |= VXLAN_GBP_DONT_LEARN;
+
+	if (gbp->policy_applied)
+		md->gbp |= VXLAN_GBP_POLICY_APPLIED;
+
+	/* In flow-based mode, GBP is carried in dst_metadata */
+	if (!(vxflags & VXLAN_F_COLLECT_METADATA))
+		skb->mark = md->gbp;
+out:
+	unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
+}
+
+static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
+				__be16 *protocol,
+				struct sk_buff *skb, u32 vxflags)
+{
+	struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
+
+	/* Need to have Next Protocol set for interfaces in GPE mode. */
+	if (!gpe->np_applied)
+		return false;
+	/* "The initial version is 0. If a receiver does not support the
+	 * version indicated it MUST drop the packet.
+	 */
+	if (gpe->version != 0)
+		return false;
+	/* "When the O bit is set to 1, the packet is an OAM packet and OAM
+	 * processing MUST occur." However, we don't implement OAM
+	 * processing, thus drop the packet.
+	 */
+	if (gpe->oam_flag)
+		return false;
+
+	*protocol = tun_p_to_eth_p(gpe->next_protocol);
+	if (!*protocol)
+		return false;
+
+	unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
+	return true;
+}
+
+static bool vxlan_set_mac(struct vxlan_dev *vxlan,
+			  struct vxlan_sock *vs,
+			  struct sk_buff *skb, __be32 vni)
+{
+	union vxlan_addr saddr;
+	u32 ifindex = skb->dev->ifindex;
+
+	skb_reset_mac_header(skb);
+	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))
+		return false;
+
+	/* Get address from the outer IP header */
+	if (vxlan_get_sk_family(vs) == AF_INET) {
+		saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
+		saddr.sa.sa_family = AF_INET;
+#if IS_ENABLED(CONFIG_IPV6)
+	} else {
+		saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
+		saddr.sa.sa_family = AF_INET6;
+#endif
+	}
+
+	if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
+	    vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
+		return false;
+
+	return true;
+}
+
+static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
+				  struct sk_buff *skb)
+{
+	int err = 0;
+
+	if (vxlan_get_sk_family(vs) == AF_INET)
+		err = IP_ECN_decapsulate(oiph, skb);
+#if IS_ENABLED(CONFIG_IPV6)
+	else
+		err = IP6_ECN_decapsulate(oiph, skb);
+#endif
+
+	if (unlikely(err) && log_ecn_error) {
+		if (vxlan_get_sk_family(vs) == AF_INET)
+			net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
+					     &((struct iphdr *)oiph)->saddr,
+					     ((struct iphdr *)oiph)->tos);
+		else
+			net_info_ratelimited("non-ECT from %pI6\n",
+					     &((struct ipv6hdr *)oiph)->saddr);
+	}
+	return err <= 1;
+}
+
+/* Callback from net/ipv4/udp.c to receive packets */
+static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
+{
+	struct vxlan_dev *vxlan;
+	struct vxlan_sock *vs;
+	struct vxlanhdr unparsed;
+	struct vxlan_metadata _md;
+	struct vxlan_metadata *md = &_md;
+	__be16 protocol = htons(ETH_P_TEB);
+	bool raw_proto = false;
+	void *oiph;
+	__be32 vni = 0;
+
+	/* Need UDP and VXLAN header to be present */
+	if (!pskb_may_pull(skb, VXLAN_HLEN))
+		goto drop;
+
+	unparsed = *vxlan_hdr(skb);
+	/* VNI flag always required to be set */
+	if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
+		netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
+			   ntohl(vxlan_hdr(skb)->vx_flags),
+			   ntohl(vxlan_hdr(skb)->vx_vni));
+		/* Return non vxlan pkt */
+		goto drop;
+	}
+	unparsed.vx_flags &= ~VXLAN_HF_VNI;
+	unparsed.vx_vni &= ~VXLAN_VNI_MASK;
+
+	vs = rcu_dereference_sk_user_data(sk);
+	if (!vs)
+		goto drop;
+
+	vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
+
+	vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
+	if (!vxlan)
+		goto drop;
+
+	/* For backwards compatibility, only allow reserved fields to be
+	 * used by VXLAN extensions if explicitly requested.
+	 */
+	if (vs->flags & VXLAN_F_GPE) {
+		if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
+			goto drop;
+		raw_proto = true;
+	}
+
+	if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
+				   !net_eq(vxlan->net, dev_net(vxlan->dev))))
+		goto drop;
+
+	if (vs->flags & VXLAN_F_REMCSUM_RX)
+		if (unlikely(!vxlan_remcsum(&unparsed, skb, vs->flags)))
+			goto drop;
+
+	if (vxlan_collect_metadata(vs)) {
+		struct metadata_dst *tun_dst;
+
+		tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
+					 key32_to_tunnel_id(vni), sizeof(*md));
+
+		if (!tun_dst)
+			goto drop;
+
+		md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
+
+		skb_dst_set(skb, (struct dst_entry *)tun_dst);
+	} else {
+		memset(md, 0, sizeof(*md));
+	}
+
+	if (vs->flags & VXLAN_F_GBP)
+		vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
+	/* Note that GBP and GPE can never be active together. This is
+	 * ensured in vxlan_dev_configure.
+	 */
+
+	if (unparsed.vx_flags || unparsed.vx_vni) {
+		/* 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 compatibility with previous stack code, and also
+		 * is more robust and provides a little more security in
+		 * adding extensions to VXLAN.
+		 */
+		goto drop;
+	}
+
+	if (!raw_proto) {
+		if (!vxlan_set_mac(vxlan, vs, skb, vni))
+			goto drop;
+	} else {
+		skb_reset_mac_header(skb);
+		skb->dev = vxlan->dev;
+		skb->pkt_type = PACKET_HOST;
+	}
+
+	oiph = skb_network_header(skb);
+	skb_reset_network_header(skb);
+
+	if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
+		++vxlan->dev->stats.rx_frame_errors;
+		++vxlan->dev->stats.rx_errors;
+		goto drop;
+	}
+
+	rcu_read_lock();
+
+	if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
+		rcu_read_unlock();
+		atomic_long_inc(&vxlan->dev->rx_dropped);
+		goto drop;
+	}
+
+	dev_sw_netstats_rx_add(vxlan->dev, skb->len);
+	gro_cells_receive(&vxlan->gro_cells, skb);
+
+	rcu_read_unlock();
+
+	return 0;
+
+drop:
+	/* Consume bad packet */
+	kfree_skb(skb);
+	return 0;
+}
+
+/* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */
+static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb)
+{
+	struct vxlan_dev *vxlan;
+	struct vxlan_sock *vs;
+	struct vxlanhdr *hdr;
+	__be32 vni;
+
+	if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN))
+		return -EINVAL;
+
+	hdr = vxlan_hdr(skb);
+
+	if (!(hdr->vx_flags & VXLAN_HF_VNI))
+		return -EINVAL;
+
+	vs = rcu_dereference_sk_user_data(sk);
+	if (!vs)
+		return -ENOENT;
+
+	vni = vxlan_vni(hdr->vx_vni);
+	vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
+	if (!vxlan)
+		return -ENOENT;
+
+	return 0;
+}
+
+static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	struct arphdr *parp;
+	u8 *arpptr, *sha;
+	__be32 sip, tip;
+	struct neighbour *n;
+
+	if (dev->flags & IFF_NOARP)
+		goto out;
+
+	if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
+		dev->stats.tx_dropped++;
+		goto out;
+	}
+	parp = arp_hdr(skb);
+
+	if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
+	     parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
+	    parp->ar_pro != htons(ETH_P_IP) ||
+	    parp->ar_op != htons(ARPOP_REQUEST) ||
+	    parp->ar_hln != dev->addr_len ||
+	    parp->ar_pln != 4)
+		goto out;
+	arpptr = (u8 *)parp + sizeof(struct arphdr);
+	sha = arpptr;
+	arpptr += dev->addr_len;	/* sha */
+	memcpy(&sip, arpptr, sizeof(sip));
+	arpptr += sizeof(sip);
+	arpptr += dev->addr_len;	/* tha */
+	memcpy(&tip, arpptr, sizeof(tip));
+
+	if (ipv4_is_loopback(tip) ||
+	    ipv4_is_multicast(tip))
+		goto out;
+
+	n = neigh_lookup(&arp_tbl, &tip, dev);
+
+	if (n) {
+		struct vxlan_fdb *f;
+		struct sk_buff	*reply;
+
+		if (!(n->nud_state & NUD_CONNECTED)) {
+			neigh_release(n);
+			goto out;
+		}
+
+		f = vxlan_find_mac(vxlan, n->ha, vni);
+		if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
+			/* bridge-local neighbor */
+			neigh_release(n);
+			goto out;
+		}
+
+		reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
+				n->ha, sha);
+
+		neigh_release(n);
+
+		if (reply == NULL)
+			goto out;
+
+		skb_reset_mac_header(reply);
+		__skb_pull(reply, skb_network_offset(reply));
+		reply->ip_summed = CHECKSUM_UNNECESSARY;
+		reply->pkt_type = PACKET_HOST;
+
+		if (netif_rx_ni(reply) == NET_RX_DROP)
+			dev->stats.rx_dropped++;
+	} else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
+		union vxlan_addr ipa = {
+			.sin.sin_addr.s_addr = tip,
+			.sin.sin_family = AF_INET,
+		};
+
+		vxlan_ip_miss(dev, &ipa);
+	}
+out:
+	consume_skb(skb);
+	return NETDEV_TX_OK;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static struct sk_buff *vxlan_na_create(struct sk_buff *request,
+	struct neighbour *n, bool isrouter)
+{
+	struct net_device *dev = request->dev;
+	struct sk_buff *reply;
+	struct nd_msg *ns, *na;
+	struct ipv6hdr *pip6;
+	u8 *daddr;
+	int na_olen = 8; /* opt hdr + ETH_ALEN for target */
+	int ns_olen;
+	int i, len;
+
+	if (dev == NULL || !pskb_may_pull(request, request->len))
+		return NULL;
+
+	len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
+		sizeof(*na) + na_olen + dev->needed_tailroom;
+	reply = alloc_skb(len, GFP_ATOMIC);
+	if (reply == NULL)
+		return NULL;
+
+	reply->protocol = htons(ETH_P_IPV6);
+	reply->dev = dev;
+	skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
+	skb_push(reply, sizeof(struct ethhdr));
+	skb_reset_mac_header(reply);
+
+	ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
+
+	daddr = eth_hdr(request)->h_source;
+	ns_olen = request->len - skb_network_offset(request) -
+		sizeof(struct ipv6hdr) - sizeof(*ns);
+	for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
+		if (!ns->opt[i + 1]) {
+			kfree_skb(reply);
+			return NULL;
+		}
+		if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
+			daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
+			break;
+		}
+	}
+
+	/* Ethernet header */
+	ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
+	ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
+	eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
+	reply->protocol = htons(ETH_P_IPV6);
+
+	skb_pull(reply, sizeof(struct ethhdr));
+	skb_reset_network_header(reply);
+	skb_put(reply, sizeof(struct ipv6hdr));
+
+	/* IPv6 header */
+
+	pip6 = ipv6_hdr(reply);
+	memset(pip6, 0, sizeof(struct ipv6hdr));
+	pip6->version = 6;
+	pip6->priority = ipv6_hdr(request)->priority;
+	pip6->nexthdr = IPPROTO_ICMPV6;
+	pip6->hop_limit = 255;
+	pip6->daddr = ipv6_hdr(request)->saddr;
+	pip6->saddr = *(struct in6_addr *)n->primary_key;
+
+	skb_pull(reply, sizeof(struct ipv6hdr));
+	skb_reset_transport_header(reply);
+
+	/* Neighbor Advertisement */
+	na = skb_put_zero(reply, sizeof(*na) + na_olen);
+	na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
+	na->icmph.icmp6_router = isrouter;
+	na->icmph.icmp6_override = 1;
+	na->icmph.icmp6_solicited = 1;
+	na->target = ns->target;
+	ether_addr_copy(&na->opt[2], n->ha);
+	na->opt[0] = ND_OPT_TARGET_LL_ADDR;
+	na->opt[1] = na_olen >> 3;
+
+	na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
+		&pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
+		csum_partial(na, sizeof(*na)+na_olen, 0));
+
+	pip6->payload_len = htons(sizeof(*na)+na_olen);
+
+	skb_push(reply, sizeof(struct ipv6hdr));
+
+	reply->ip_summed = CHECKSUM_UNNECESSARY;
+
+	return reply;
+}
+
+static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	const struct in6_addr *daddr;
+	const struct ipv6hdr *iphdr;
+	struct inet6_dev *in6_dev;
+	struct neighbour *n;
+	struct nd_msg *msg;
+
+	rcu_read_lock();
+	in6_dev = __in6_dev_get(dev);
+	if (!in6_dev)
+		goto out;
+
+	iphdr = ipv6_hdr(skb);
+	daddr = &iphdr->daddr;
+	msg = (struct nd_msg *)(iphdr + 1);
+
+	if (ipv6_addr_loopback(daddr) ||
+	    ipv6_addr_is_multicast(&msg->target))
+		goto out;
+
+	n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
+
+	if (n) {
+		struct vxlan_fdb *f;
+		struct sk_buff *reply;
+
+		if (!(n->nud_state & NUD_CONNECTED)) {
+			neigh_release(n);
+			goto out;
+		}
+
+		f = vxlan_find_mac(vxlan, n->ha, vni);
+		if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
+			/* bridge-local neighbor */
+			neigh_release(n);
+			goto out;
+		}
+
+		reply = vxlan_na_create(skb, n,
+					!!(f ? f->flags & NTF_ROUTER : 0));
+
+		neigh_release(n);
+
+		if (reply == NULL)
+			goto out;
+
+		if (netif_rx_ni(reply) == NET_RX_DROP)
+			dev->stats.rx_dropped++;
+
+	} else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
+		union vxlan_addr ipa = {
+			.sin6.sin6_addr = msg->target,
+			.sin6.sin6_family = AF_INET6,
+		};
+
+		vxlan_ip_miss(dev, &ipa);
+	}
+
+out:
+	rcu_read_unlock();
+	consume_skb(skb);
+	return NETDEV_TX_OK;
+}
+#endif
+
+static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	struct neighbour *n;
+
+	if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
+		return false;
+
+	n = NULL;
+	switch (ntohs(eth_hdr(skb)->h_proto)) {
+	case ETH_P_IP:
+	{
+		struct iphdr *pip;
+
+		if (!pskb_may_pull(skb, sizeof(struct iphdr)))
+			return false;
+		pip = ip_hdr(skb);
+		n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
+		if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
+			union vxlan_addr ipa = {
+				.sin.sin_addr.s_addr = pip->daddr,
+				.sin.sin_family = AF_INET,
+			};
+
+			vxlan_ip_miss(dev, &ipa);
+			return false;
+		}
+
+		break;
+	}
+#if IS_ENABLED(CONFIG_IPV6)
+	case ETH_P_IPV6:
+	{
+		struct ipv6hdr *pip6;
+
+		if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
+			return false;
+		pip6 = ipv6_hdr(skb);
+		n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
+		if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
+			union vxlan_addr ipa = {
+				.sin6.sin6_addr = pip6->daddr,
+				.sin6.sin6_family = AF_INET6,
+			};
+
+			vxlan_ip_miss(dev, &ipa);
+			return false;
+		}
+
+		break;
+	}
+#endif
+	default:
+		return false;
+	}
+
+	if (n) {
+		bool diff;
+
+		diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
+		if (diff) {
+			memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
+				dev->addr_len);
+			memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
+		}
+		neigh_release(n);
+		return diff;
+	}
+
+	return false;
+}
+
+static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
+				struct vxlan_metadata *md)
+{
+	struct vxlanhdr_gbp *gbp;
+
+	if (!md->gbp)
+		return;
+
+	gbp = (struct vxlanhdr_gbp *)vxh;
+	vxh->vx_flags |= VXLAN_HF_GBP;
+
+	if (md->gbp & VXLAN_GBP_DONT_LEARN)
+		gbp->dont_learn = 1;
+
+	if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
+		gbp->policy_applied = 1;
+
+	gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
+}
+
+static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
+			       __be16 protocol)
+{
+	struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
+
+	gpe->np_applied = 1;
+	gpe->next_protocol = tun_p_from_eth_p(protocol);
+	if (!gpe->next_protocol)
+		return -EPFNOSUPPORT;
+	return 0;
+}
+
+static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
+			   int iphdr_len, __be32 vni,
+			   struct vxlan_metadata *md, u32 vxflags,
+			   bool udp_sum)
+{
+	struct vxlanhdr *vxh;
+	int min_headroom;
+	int err;
+	int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
+	__be16 inner_protocol = htons(ETH_P_TEB);
+
+	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)))
+			type |= SKB_GSO_TUNNEL_REMCSUM;
+	}
+
+	min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
+			+ VXLAN_HLEN + iphdr_len;
+
+	/* Need space for new headers (invalidates iph ptr) */
+	err = skb_cow_head(skb, min_headroom);
+	if (unlikely(err))
+		return err;
+
+	err = iptunnel_handle_offloads(skb, type);
+	if (err)
+		return err;
+
+	vxh = __skb_push(skb, sizeof(*vxh));
+	vxh->vx_flags = VXLAN_HF_VNI;
+	vxh->vx_vni = vxlan_vni_field(vni);
+
+	if (type & SKB_GSO_TUNNEL_REMCSUM) {
+		unsigned int start;
+
+		start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
+		vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
+		vxh->vx_flags |= VXLAN_HF_RCO;
+
+		if (!skb_is_gso(skb)) {
+			skb->ip_summed = CHECKSUM_NONE;
+			skb->encapsulation = 0;
+		}
+	}
+
+	if (vxflags & VXLAN_F_GBP)
+		vxlan_build_gbp_hdr(vxh, vxflags, md);
+	if (vxflags & VXLAN_F_GPE) {
+		err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
+		if (err < 0)
+			return err;
+		inner_protocol = skb->protocol;
+	}
+
+	skb_set_inner_protocol(skb, inner_protocol);
+	return 0;
+}
+
+static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
+				      struct vxlan_sock *sock4,
+				      struct sk_buff *skb, int oif, u8 tos,
+				      __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
+				      struct dst_cache *dst_cache,
+				      const struct ip_tunnel_info *info)
+{
+	bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
+	struct rtable *rt = NULL;
+	struct flowi4 fl4;
+
+	if (!sock4)
+		return ERR_PTR(-EIO);
+
+	if (tos && !info)
+		use_cache = false;
+	if (use_cache) {
+		rt = dst_cache_get_ip4(dst_cache, saddr);
+		if (rt)
+			return rt;
+	}
+
+	memset(&fl4, 0, sizeof(fl4));
+	fl4.flowi4_oif = oif;
+	fl4.flowi4_tos = RT_TOS(tos);
+	fl4.flowi4_mark = skb->mark;
+	fl4.flowi4_proto = IPPROTO_UDP;
+	fl4.daddr = daddr;
+	fl4.saddr = *saddr;
+	fl4.fl4_dport = dport;
+	fl4.fl4_sport = sport;
+
+	rt = ip_route_output_key(vxlan->net, &fl4);
+	if (!IS_ERR(rt)) {
+		if (rt->dst.dev == dev) {
+			netdev_dbg(dev, "circular route to %pI4\n", &daddr);
+			ip_rt_put(rt);
+			return ERR_PTR(-ELOOP);
+		}
+
+		*saddr = fl4.saddr;
+		if (use_cache)
+			dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
+	} else {
+		netdev_dbg(dev, "no route to %pI4\n", &daddr);
+		return ERR_PTR(-ENETUNREACH);
+	}
+	return rt;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
+					  struct net_device *dev,
+					  struct vxlan_sock *sock6,
+					  struct sk_buff *skb, int oif, u8 tos,
+					  __be32 label,
+					  const struct in6_addr *daddr,
+					  struct in6_addr *saddr,
+					  __be16 dport, __be16 sport,
+					  struct dst_cache *dst_cache,
+					  const struct ip_tunnel_info *info)
+{
+	bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
+	struct dst_entry *ndst;
+	struct flowi6 fl6;
+
+	if (!sock6)
+		return ERR_PTR(-EIO);
+
+	if (tos && !info)
+		use_cache = false;
+	if (use_cache) {
+		ndst = dst_cache_get_ip6(dst_cache, saddr);
+		if (ndst)
+			return ndst;
+	}
+
+	memset(&fl6, 0, sizeof(fl6));
+	fl6.flowi6_oif = oif;
+	fl6.daddr = *daddr;
+	fl6.saddr = *saddr;
+	fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
+	fl6.flowi6_mark = skb->mark;
+	fl6.flowi6_proto = IPPROTO_UDP;
+	fl6.fl6_dport = dport;
+	fl6.fl6_sport = sport;
+
+	ndst = ipv6_stub->ipv6_dst_lookup_flow(vxlan->net, sock6->sock->sk,
+					       &fl6, NULL);
+	if (IS_ERR(ndst)) {
+		netdev_dbg(dev, "no route to %pI6\n", daddr);
+		return ERR_PTR(-ENETUNREACH);
+	}
+
+	if (unlikely(ndst->dev == dev)) {
+		netdev_dbg(dev, "circular route to %pI6\n", daddr);
+		dst_release(ndst);
+		return ERR_PTR(-ELOOP);
+	}
+
+	*saddr = fl6.saddr;
+	if (use_cache)
+		dst_cache_set_ip6(dst_cache, ndst, saddr);
+	return ndst;
+}
+#endif
+
+/* Bypass encapsulation if the destination is local */
+static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
+			       struct vxlan_dev *dst_vxlan, __be32 vni,
+			       bool snoop)
+{
+	struct pcpu_sw_netstats *tx_stats, *rx_stats;
+	union vxlan_addr loopback;
+	union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
+	struct net_device *dev;
+	int len = skb->len;
+
+	tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
+	rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
+	skb->pkt_type = PACKET_HOST;
+	skb->encapsulation = 0;
+	skb->dev = dst_vxlan->dev;
+	__skb_pull(skb, skb_network_offset(skb));
+
+	if (remote_ip->sa.sa_family == AF_INET) {
+		loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+		loopback.sa.sa_family =  AF_INET;
+#if IS_ENABLED(CONFIG_IPV6)
+	} else {
+		loopback.sin6.sin6_addr = in6addr_loopback;
+		loopback.sa.sa_family =  AF_INET6;
+#endif
+	}
+
+	rcu_read_lock();
+	dev = skb->dev;
+	if (unlikely(!(dev->flags & IFF_UP))) {
+		kfree_skb(skb);
+		goto drop;
+	}
+
+	if ((dst_vxlan->cfg.flags & VXLAN_F_LEARN) && snoop)
+		vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni);
+
+	u64_stats_update_begin(&tx_stats->syncp);
+	tx_stats->tx_packets++;
+	tx_stats->tx_bytes += len;
+	u64_stats_update_end(&tx_stats->syncp);
+
+	if (__netif_rx(skb) == NET_RX_SUCCESS) {
+		u64_stats_update_begin(&rx_stats->syncp);
+		rx_stats->rx_packets++;
+		rx_stats->rx_bytes += len;
+		u64_stats_update_end(&rx_stats->syncp);
+	} else {
+drop:
+		dev->stats.rx_dropped++;
+	}
+	rcu_read_unlock();
+}
+
+static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
+				 struct vxlan_dev *vxlan,
+				 union vxlan_addr *daddr,
+				 __be16 dst_port, int dst_ifindex, __be32 vni,
+				 struct dst_entry *dst,
+				 u32 rt_flags)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+	/* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
+	 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
+	 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
+	 */
+	BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
+#endif
+	/* Bypass encapsulation if the destination is local */
+	if (rt_flags & RTCF_LOCAL &&
+	    !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
+		struct vxlan_dev *dst_vxlan;
+
+		dst_release(dst);
+		dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
+					   daddr->sa.sa_family, dst_port,
+					   vxlan->cfg.flags);
+		if (!dst_vxlan) {
+			dev->stats.tx_errors++;
+			kfree_skb(skb);
+
+			return -ENOENT;
+		}
+		vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni, true);
+		return 1;
+	}
+
+	return 0;
+}
+
+static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
+			   __be32 default_vni, struct vxlan_rdst *rdst,
+			   bool did_rsc)
+{
+	struct dst_cache *dst_cache;
+	struct ip_tunnel_info *info;
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	const struct iphdr *old_iph = ip_hdr(skb);
+	union vxlan_addr *dst;
+	union vxlan_addr remote_ip, local_ip;
+	struct vxlan_metadata _md;
+	struct vxlan_metadata *md = &_md;
+	__be16 src_port = 0, dst_port;
+	struct dst_entry *ndst = NULL;
+	__be32 vni, label;
+	__u8 tos, ttl;
+	int ifindex;
+	int err;
+	u32 flags = vxlan->cfg.flags;
+	bool udp_sum = false;
+	bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
+
+	info = skb_tunnel_info(skb);
+
+	if (rdst) {
+		dst = &rdst->remote_ip;
+		if (vxlan_addr_any(dst)) {
+			if (did_rsc) {
+				/* short-circuited back to local bridge */
+				vxlan_encap_bypass(skb, vxlan, vxlan,
+						   default_vni, true);
+				return;
+			}
+			goto drop;
+		}
+
+		dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
+		vni = (rdst->remote_vni) ? : default_vni;
+		ifindex = rdst->remote_ifindex;
+		local_ip = vxlan->cfg.saddr;
+		dst_cache = &rdst->dst_cache;
+		md->gbp = skb->mark;
+		if (flags & VXLAN_F_TTL_INHERIT) {
+			ttl = ip_tunnel_get_ttl(old_iph, skb);
+		} else {
+			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);
+
+		if (dst->sa.sa_family == AF_INET)
+			udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
+		else
+			udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
+		label = vxlan->cfg.label;
+	} else {
+		if (!info) {
+			WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
+				  dev->name);
+			goto drop;
+		}
+		remote_ip.sa.sa_family = ip_tunnel_info_af(info);
+		if (remote_ip.sa.sa_family == AF_INET) {
+			remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
+			local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
+		} else {
+			remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
+			local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
+		}
+		dst = &remote_ip;
+		dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
+		vni = tunnel_id_to_key32(info->key.tun_id);
+		ifindex = 0;
+		dst_cache = &info->dst_cache;
+		if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
+			if (info->options_len < sizeof(*md))
+				goto drop;
+			md = ip_tunnel_info_opts(info);
+		}
+		ttl = info->key.ttl;
+		tos = info->key.tos;
+		label = info->key.label;
+		udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
+	}
+	src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
+				     vxlan->cfg.port_max, true);
+
+	rcu_read_lock();
+	if (dst->sa.sa_family == AF_INET) {
+		struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
+		struct rtable *rt;
+		__be16 df = 0;
+
+		if (!ifindex)
+			ifindex = sock4->sock->sk->sk_bound_dev_if;
+
+		rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
+				     dst->sin.sin_addr.s_addr,
+				     &local_ip.sin.sin_addr.s_addr,
+				     dst_port, src_port,
+				     dst_cache, info);
+		if (IS_ERR(rt)) {
+			err = PTR_ERR(rt);
+			goto tx_error;
+		}
+
+		if (!info) {
+			/* Bypass encapsulation if the destination is local */
+			err = encap_bypass_if_local(skb, dev, vxlan, dst,
+						    dst_port, ifindex, vni,
+						    &rt->dst, rt->rt_flags);
+			if (err)
+				goto out_unlock;
+
+			if (vxlan->cfg.df == VXLAN_DF_SET) {
+				df = htons(IP_DF);
+			} else if (vxlan->cfg.df == VXLAN_DF_INHERIT) {
+				struct ethhdr *eth = eth_hdr(skb);
+
+				if (ntohs(eth->h_proto) == ETH_P_IPV6 ||
+				    (ntohs(eth->h_proto) == ETH_P_IP &&
+				     old_iph->frag_off & htons(IP_DF)))
+					df = htons(IP_DF);
+			}
+		} else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
+			df = htons(IP_DF);
+		}
+
+		ndst = &rt->dst;
+		err = skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM,
+					    netif_is_any_bridge_port(dev));
+		if (err < 0) {
+			goto tx_error;
+		} else if (err) {
+			if (info) {
+				struct ip_tunnel_info *unclone;
+				struct in_addr src, dst;
+
+				unclone = skb_tunnel_info_unclone(skb);
+				if (unlikely(!unclone))
+					goto tx_error;
+
+				src = remote_ip.sin.sin_addr;
+				dst = local_ip.sin.sin_addr;
+				unclone->key.u.ipv4.src = src.s_addr;
+				unclone->key.u.ipv4.dst = dst.s_addr;
+			}
+			vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
+			dst_release(ndst);
+			goto out_unlock;
+		}
+
+		tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
+		ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
+		err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
+				      vni, md, flags, udp_sum);
+		if (err < 0)
+			goto tx_error;
+
+		udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
+				    dst->sin.sin_addr.s_addr, tos, ttl, df,
+				    src_port, dst_port, xnet, !udp_sum);
+#if IS_ENABLED(CONFIG_IPV6)
+	} else {
+		struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
+
+		if (!ifindex)
+			ifindex = sock6->sock->sk->sk_bound_dev_if;
+
+		ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
+					label, &dst->sin6.sin6_addr,
+					&local_ip.sin6.sin6_addr,
+					dst_port, src_port,
+					dst_cache, info);
+		if (IS_ERR(ndst)) {
+			err = PTR_ERR(ndst);
+			ndst = NULL;
+			goto tx_error;
+		}
+
+		if (!info) {
+			u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
+
+			err = encap_bypass_if_local(skb, dev, vxlan, dst,
+						    dst_port, ifindex, vni,
+						    ndst, rt6i_flags);
+			if (err)
+				goto out_unlock;
+		}
+
+		err = skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM,
+					    netif_is_any_bridge_port(dev));
+		if (err < 0) {
+			goto tx_error;
+		} else if (err) {
+			if (info) {
+				struct ip_tunnel_info *unclone;
+				struct in6_addr src, dst;
+
+				unclone = skb_tunnel_info_unclone(skb);
+				if (unlikely(!unclone))
+					goto tx_error;
+
+				src = remote_ip.sin6.sin6_addr;
+				dst = local_ip.sin6.sin6_addr;
+				unclone->key.u.ipv6.src = src;
+				unclone->key.u.ipv6.dst = dst;
+			}
+
+			vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
+			dst_release(ndst);
+			goto out_unlock;
+		}
+
+		tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
+		ttl = ttl ? : ip6_dst_hoplimit(ndst);
+		skb_scrub_packet(skb, xnet);
+		err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
+				      vni, md, flags, udp_sum);
+		if (err < 0)
+			goto tx_error;
+
+		udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
+				     &local_ip.sin6.sin6_addr,
+				     &dst->sin6.sin6_addr, tos, ttl,
+				     label, src_port, dst_port, !udp_sum);
+#endif
+	}
+out_unlock:
+	rcu_read_unlock();
+	return;
+
+drop:
+	dev->stats.tx_dropped++;
+	dev_kfree_skb(skb);
+	return;
+
+tx_error:
+	rcu_read_unlock();
+	if (err == -ELOOP)
+		dev->stats.collisions++;
+	else if (err == -ENETUNREACH)
+		dev->stats.tx_carrier_errors++;
+	dst_release(ndst);
+	dev->stats.tx_errors++;
+	kfree_skb(skb);
+}
+
+static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev,
+			  struct vxlan_fdb *f, __be32 vni, bool did_rsc)
+{
+	struct vxlan_rdst nh_rdst;
+	struct nexthop *nh;
+	bool do_xmit;
+	u32 hash;
+
+	memset(&nh_rdst, 0, sizeof(struct vxlan_rdst));
+	hash = skb_get_hash(skb);
+
+	rcu_read_lock();
+	nh = rcu_dereference(f->nh);
+	if (!nh) {
+		rcu_read_unlock();
+		goto drop;
+	}
+	do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst);
+	rcu_read_unlock();
+
+	if (likely(do_xmit))
+		vxlan_xmit_one(skb, dev, vni, &nh_rdst, did_rsc);
+	else
+		goto drop;
+
+	return;
+
+drop:
+	dev->stats.tx_dropped++;
+	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
+ */
+static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	struct vxlan_rdst *rdst, *fdst = NULL;
+	const struct ip_tunnel_info *info;
+	bool did_rsc = false;
+	struct vxlan_fdb *f;
+	struct ethhdr *eth;
+	__be32 vni = 0;
+
+	info = skb_tunnel_info(skb);
+
+	skb_reset_mac_header(skb);
+
+	if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
+		if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
+		    info->mode & IP_TUNNEL_INFO_TX) {
+			vni = tunnel_id_to_key32(info->key.tun_id);
+		} else {
+			if (info && info->mode & IP_TUNNEL_INFO_TX)
+				vxlan_xmit_one(skb, dev, vni, NULL, false);
+			else
+				kfree_skb(skb);
+			return NETDEV_TX_OK;
+		}
+	}
+
+	if (vxlan->cfg.flags & VXLAN_F_PROXY) {
+		eth = eth_hdr(skb);
+		if (ntohs(eth->h_proto) == ETH_P_ARP)
+			return arp_reduce(dev, skb, vni);
+#if IS_ENABLED(CONFIG_IPV6)
+		else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
+			 pskb_may_pull(skb, sizeof(struct ipv6hdr) +
+					    sizeof(struct nd_msg)) &&
+			 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
+			struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
+
+			if (m->icmph.icmp6_code == 0 &&
+			    m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
+				return neigh_reduce(dev, skb, vni);
+		}
+#endif
+	}
+
+	eth = eth_hdr(skb);
+	f = vxlan_find_mac(vxlan, eth->h_dest, vni);
+	did_rsc = false;
+
+	if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
+	    (ntohs(eth->h_proto) == ETH_P_IP ||
+	     ntohs(eth->h_proto) == ETH_P_IPV6)) {
+		did_rsc = route_shortcircuit(dev, skb);
+		if (did_rsc)
+			f = vxlan_find_mac(vxlan, eth->h_dest, vni);
+	}
+
+	if (f == NULL) {
+		f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
+		if (f == NULL) {
+			if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
+			    !is_multicast_ether_addr(eth->h_dest))
+				vxlan_fdb_miss(vxlan, eth->h_dest);
+
+			dev->stats.tx_dropped++;
+			kfree_skb(skb);
+			return NETDEV_TX_OK;
+		}
+	}
+
+	if (rcu_access_pointer(f->nh)) {
+		vxlan_xmit_nh(skb, dev, f,
+			      (vni ? : vxlan->default_dst.remote_vni), did_rsc);
+	} else {
+		list_for_each_entry_rcu(rdst, &f->remotes, list) {
+			struct sk_buff *skb1;
+
+			if (!fdst) {
+				fdst = rdst;
+				continue;
+			}
+			skb1 = skb_clone(skb, GFP_ATOMIC);
+			if (skb1)
+				vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
+		}
+		if (fdst)
+			vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
+		else
+			kfree_skb(skb);
+	}
+
+	return NETDEV_TX_OK;
+}
+
+/* Walk the forwarding table and purge stale entries */
+static void vxlan_cleanup(struct timer_list *t)
+{
+	struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
+	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(&vxlan->hash_lock[h]);
+		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 | NUD_NOARP))
+				continue;
+
+			if (f->flags & NTF_EXT_LEARNED)
+				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, true, true);
+			} else if (time_before(timeout, next_timer))
+				next_timer = timeout;
+		}
+		spin_unlock(&vxlan->hash_lock[h]);
+	}
+
+	mod_timer(&vxlan->age_timer, next_timer);
+}
+
+static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
+{
+	struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
+
+	spin_lock(&vn->sock_lock);
+	hlist_del_init_rcu(&vxlan->hlist4.hlist);
+#if IS_ENABLED(CONFIG_IPV6)
+	hlist_del_init_rcu(&vxlan->hlist6.hlist);
+#endif
+	spin_unlock(&vn->sock_lock);
+}
+
+static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
+			     struct vxlan_dev_node *node)
+{
+	struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
+	__be32 vni = vxlan->default_dst.remote_vni;
+
+	node->vxlan = vxlan;
+	spin_lock(&vn->sock_lock);
+	hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
+	spin_unlock(&vn->sock_lock);
+}
+
+/* Setup stats when device is created */
+static int vxlan_init(struct net_device *dev)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	int err;
+
+	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+	if (!dev->tstats)
+		return -ENOMEM;
+
+	err = gro_cells_init(&vxlan->gro_cells, dev);
+	if (err) {
+		free_percpu(dev->tstats);
+		return err;
+	}
+
+	return 0;
+}
+
+static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
+{
+	struct vxlan_fdb *f;
+	u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni);
+
+	spin_lock_bh(&vxlan->hash_lock[hash_index]);
+	f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
+	if (f)
+		vxlan_fdb_destroy(vxlan, f, true, true);
+	spin_unlock_bh(&vxlan->hash_lock[hash_index]);
+}
+
+static void vxlan_uninit(struct net_device *dev)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+
+	gro_cells_destroy(&vxlan->gro_cells);
+
+	vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
+
+	free_percpu(dev->tstats);
+}
+
+/* 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);
+	int ret;
+
+	ret = vxlan_sock_add(vxlan);
+	if (ret < 0)
+		return ret;
+
+	if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
+		ret = vxlan_igmp_join(vxlan);
+		if (ret == -EADDRINUSE)
+			ret = 0;
+		if (ret) {
+			vxlan_sock_release(vxlan);
+			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, bool do_all)
+{
+	unsigned int h;
+
+	for (h = 0; h < FDB_HASH_SIZE; ++h) {
+		struct hlist_node *p, *n;
+
+		spin_lock_bh(&vxlan->hash_lock[h]);
+		hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
+			struct vxlan_fdb *f
+				= container_of(p, struct vxlan_fdb, hlist);
+			if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
+				continue;
+			/* the all_zeros_mac entry is deleted at vxlan_uninit */
+			if (is_zero_ether_addr(f->eth_addr) &&
+			    f->vni == vxlan->cfg.vni)
+				continue;
+			vxlan_fdb_destroy(vxlan, f, true, true);
+		}
+		spin_unlock_bh(&vxlan->hash_lock[h]);
+	}
+}
+
+/* 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);
+	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, false);
+	vxlan_sock_release(vxlan);
+
+	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 = __dev_get_by_index(vxlan->net,
+							 dst->remote_ifindex);
+	bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
+
+	/* This check is different than dev->max_mtu, because it looks at
+	 * the lowerdev->mtu, rather than the static dev->max_mtu
+	 */
+	if (lowerdev) {
+		int max_mtu = lowerdev->mtu -
+			      (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
+		if (new_mtu > max_mtu)
+			return -EINVAL;
+	}
+
+	dev->mtu = new_mtu;
+	return 0;
+}
+
+static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	struct ip_tunnel_info *info = skb_tunnel_info(skb);
+	__be16 sport, dport;
+
+	sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
+				  vxlan->cfg.port_max, true);
+	dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
+
+	if (ip_tunnel_info_af(info) == AF_INET) {
+		struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
+		struct rtable *rt;
+
+		rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
+				     info->key.u.ipv4.dst,
+				     &info->key.u.ipv4.src, dport, sport,
+				     &info->dst_cache, info);
+		if (IS_ERR(rt))
+			return PTR_ERR(rt);
+		ip_rt_put(rt);
+	} else {
+#if IS_ENABLED(CONFIG_IPV6)
+		struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
+		struct dst_entry *ndst;
+
+		ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
+					info->key.label, &info->key.u.ipv6.dst,
+					&info->key.u.ipv6.src, dport, sport,
+					&info->dst_cache, info);
+		if (IS_ERR(ndst))
+			return PTR_ERR(ndst);
+		dst_release(ndst);
+#else /* !CONFIG_IPV6 */
+		return -EPFNOSUPPORT;
+#endif
+	}
+	info->key.tp_src = sport;
+	info->key.tp_dst = dport;
+	return 0;
+}
+
+static const struct net_device_ops vxlan_netdev_ether_ops = {
+	.ndo_init		= vxlan_init,
+	.ndo_uninit		= vxlan_uninit,
+	.ndo_open		= vxlan_open,
+	.ndo_stop		= vxlan_stop,
+	.ndo_start_xmit		= vxlan_xmit,
+	.ndo_get_stats64	= dev_get_tstats64,
+	.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,
+	.ndo_fdb_add		= vxlan_fdb_add,
+	.ndo_fdb_del		= vxlan_fdb_delete,
+	.ndo_fdb_dump		= vxlan_fdb_dump,
+	.ndo_fdb_get		= vxlan_fdb_get,
+	.ndo_fill_metadata_dst	= vxlan_fill_metadata_dst,
+};
+
+static const struct net_device_ops vxlan_netdev_raw_ops = {
+	.ndo_init		= vxlan_init,
+	.ndo_uninit		= vxlan_uninit,
+	.ndo_open		= vxlan_open,
+	.ndo_stop		= vxlan_stop,
+	.ndo_start_xmit		= vxlan_xmit,
+	.ndo_get_stats64	= dev_get_tstats64,
+	.ndo_change_mtu		= vxlan_change_mtu,
+	.ndo_fill_metadata_dst	= vxlan_fill_metadata_dst,
+};
+
+/* Info for udev, that this is a virtual tunnel endpoint */
+static struct device_type vxlan_type = {
+	.name = "vxlan",
+};
+
+/* Calls the ndo_udp_tunnel_add of the caller in order to
+ * supply the listening VXLAN udp ports. Callers are expected
+ * to implement the ndo_udp_tunnel_add.
+ */
+static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
+{
+	struct vxlan_sock *vs;
+	struct net *net = dev_net(dev);
+	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+	unsigned int i;
+
+	spin_lock(&vn->sock_lock);
+	for (i = 0; i < PORT_HASH_SIZE; ++i) {
+		hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
+			unsigned short type;
+
+			if (vs->flags & VXLAN_F_GPE)
+				type = UDP_TUNNEL_TYPE_VXLAN_GPE;
+			else
+				type = UDP_TUNNEL_TYPE_VXLAN;
+
+			if (push)
+				udp_tunnel_push_rx_port(dev, vs->sock, type);
+			else
+				udp_tunnel_drop_rx_port(dev, vs->sock, type);
+		}
+	}
+	spin_unlock(&vn->sock_lock);
+}
+
+/* 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->needs_free_netdev = true;
+	SET_NETDEV_DEVTYPE(dev, &vxlan_type);
+
+	dev->features	|= NETIF_F_LLTX;
+	dev->features	|= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
+	dev->features   |= NETIF_F_RXCSUM;
+	dev->features   |= NETIF_F_GSO_SOFTWARE;
+
+	dev->vlan_features = dev->features;
+	dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
+	dev->hw_features |= NETIF_F_RXCSUM;
+	dev->hw_features |= NETIF_F_GSO_SOFTWARE;
+	netif_keep_dst(dev);
+	dev->priv_flags |= IFF_NO_QUEUE | IFF_CHANGE_PROTO_DOWN;
+
+	/* MTU range: 68 - 65535 */
+	dev->min_mtu = ETH_MIN_MTU;
+	dev->max_mtu = ETH_MAX_MTU;
+
+	INIT_LIST_HEAD(&vxlan->next);
+
+	timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
+
+	vxlan->dev = dev;
+
+	for (h = 0; h < FDB_HASH_SIZE; ++h) {
+		spin_lock_init(&vxlan->hash_lock[h]);
+		INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
+	}
+}
+
+static void vxlan_ether_setup(struct net_device *dev)
+{
+	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
+	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
+	dev->netdev_ops = &vxlan_netdev_ether_ops;
+}
+
+static void vxlan_raw_setup(struct net_device *dev)
+{
+	dev->header_ops = NULL;
+	dev->type = ARPHRD_NONE;
+	dev->hard_header_len = 0;
+	dev->addr_len = 0;
+	dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
+	dev->netdev_ops = &vxlan_netdev_raw_ops;
+}
+
+static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
+	[IFLA_VXLAN_ID]		= { .type = NLA_U32 },
+	[IFLA_VXLAN_GROUP]	= { .len = sizeof_field(struct iphdr, daddr) },
+	[IFLA_VXLAN_GROUP6]	= { .len = sizeof(struct in6_addr) },
+	[IFLA_VXLAN_LINK]	= { .type = NLA_U32 },
+	[IFLA_VXLAN_LOCAL]	= { .len = sizeof_field(struct iphdr, saddr) },
+	[IFLA_VXLAN_LOCAL6]	= { .len = sizeof(struct in6_addr) },
+	[IFLA_VXLAN_TOS]	= { .type = NLA_U8 },
+	[IFLA_VXLAN_TTL]	= { .type = NLA_U8 },
+	[IFLA_VXLAN_LABEL]	= { .type = NLA_U32 },
+	[IFLA_VXLAN_LEARNING]	= { .type = NLA_U8 },
+	[IFLA_VXLAN_AGEING]	= { .type = NLA_U32 },
+	[IFLA_VXLAN_LIMIT]	= { .type = NLA_U32 },
+	[IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
+	[IFLA_VXLAN_PROXY]	= { .type = NLA_U8 },
+	[IFLA_VXLAN_RSC]	= { .type = NLA_U8 },
+	[IFLA_VXLAN_L2MISS]	= { .type = NLA_U8 },
+	[IFLA_VXLAN_L3MISS]	= { .type = NLA_U8 },
+	[IFLA_VXLAN_COLLECT_METADATA]	= { .type = NLA_U8 },
+	[IFLA_VXLAN_PORT]	= { .type = NLA_U16 },
+	[IFLA_VXLAN_UDP_CSUM]	= { .type = NLA_U8 },
+	[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]	= { .type = NLA_U8 },
+	[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]	= { .type = NLA_U8 },
+	[IFLA_VXLAN_REMCSUM_TX]	= { .type = NLA_U8 },
+	[IFLA_VXLAN_REMCSUM_RX]	= { .type = NLA_U8 },
+	[IFLA_VXLAN_GBP]	= { .type = NLA_FLAG, },
+	[IFLA_VXLAN_GPE]	= { .type = NLA_FLAG, },
+	[IFLA_VXLAN_REMCSUM_NOPARTIAL]	= { .type = NLA_FLAG },
+	[IFLA_VXLAN_TTL_INHERIT]	= { .type = NLA_FLAG },
+	[IFLA_VXLAN_DF]		= { .type = NLA_U8 },
+};
+
+static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
+			  struct netlink_ext_ack *extack)
+{
+	if (tb[IFLA_ADDRESS]) {
+		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
+			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
+					    "Provided link layer address is not Ethernet");
+			return -EINVAL;
+		}
+
+		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
+			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
+					    "Provided Ethernet address is not unicast");
+			return -EADDRNOTAVAIL;
+		}
+	}
+
+	if (tb[IFLA_MTU]) {
+		u32 mtu = nla_get_u32(tb[IFLA_MTU]);
+
+		if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
+			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
+					    "MTU must be between 68 and 65535");
+			return -EINVAL;
+		}
+	}
+
+	if (!data) {
+		NL_SET_ERR_MSG(extack,
+			       "Required attributes not provided to perform the operation");
+		return -EINVAL;
+	}
+
+	if (data[IFLA_VXLAN_ID]) {
+		u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
+
+		if (id >= VXLAN_N_VID) {
+			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_ID],
+					    "VXLAN ID must be lower than 16777216");
+			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)) {
+			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_PORT_RANGE],
+					    "Invalid source port range");
+			return -EINVAL;
+		}
+	}
+
+	if (data[IFLA_VXLAN_DF]) {
+		enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]);
+
+		if (df < 0 || df > VXLAN_DF_MAX) {
+			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_DF],
+					    "Invalid DF attribute");
+			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 int vxlan_get_link_ksettings(struct net_device *dev,
+				    struct ethtool_link_ksettings *cmd)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	struct vxlan_rdst *dst = &vxlan->default_dst;
+	struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
+							 dst->remote_ifindex);
+
+	if (!lowerdev) {
+		cmd->base.duplex = DUPLEX_UNKNOWN;
+		cmd->base.port = PORT_OTHER;
+		cmd->base.speed = SPEED_UNKNOWN;
+
+		return 0;
+	}
+
+	return __ethtool_get_link_ksettings(lowerdev, cmd);
+}
+
+static const struct ethtool_ops vxlan_ethtool_ops = {
+	.get_drvinfo		= vxlan_get_drvinfo,
+	.get_link		= ethtool_op_get_link,
+	.get_link_ksettings	= vxlan_get_link_ksettings,
+};
+
+static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
+					__be16 port, u32 flags, int ifindex)
+{
+	struct socket *sock;
+	struct udp_port_cfg udp_conf;
+	int err;
+
+	memset(&udp_conf, 0, sizeof(udp_conf));
+
+	if (ipv6) {
+		udp_conf.family = AF_INET6;
+		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_udp_port = port;
+	udp_conf.bind_ifindex = ifindex;
+
+	/* Open UDP socket */
+	err = udp_sock_create(net, &udp_conf, &sock);
+	if (err < 0)
+		return ERR_PTR(err);
+
+	udp_allow_gso(sock->sk);
+	return sock;
+}
+
+/* Create new listen socket if needed */
+static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
+					      __be16 port, u32 flags,
+					      int ifindex)
+{
+	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+	struct vxlan_sock *vs;
+	struct socket *sock;
+	unsigned int h;
+	struct udp_tunnel_sock_cfg tunnel_cfg;
+
+	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]);
+
+	sock = vxlan_create_sock(net, ipv6, port, flags, ifindex);
+	if (IS_ERR(sock)) {
+		kfree(vs);
+		return ERR_CAST(sock);
+	}
+
+	vs->sock = sock;
+	refcount_set(&vs->refcnt, 1);
+	vs->flags = (flags & VXLAN_F_RCV_FLAGS);
+
+	spin_lock(&vn->sock_lock);
+	hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
+	udp_tunnel_notify_add_rx_port(sock,
+				      (vs->flags & VXLAN_F_GPE) ?
+				      UDP_TUNNEL_TYPE_VXLAN_GPE :
+				      UDP_TUNNEL_TYPE_VXLAN);
+	spin_unlock(&vn->sock_lock);
+
+	/* Mark socket as an encapsulation socket. */
+	memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
+	tunnel_cfg.sk_user_data = vs;
+	tunnel_cfg.encap_type = 1;
+	tunnel_cfg.encap_rcv = vxlan_rcv;
+	tunnel_cfg.encap_err_lookup = vxlan_err_lookup;
+	tunnel_cfg.encap_destroy = NULL;
+	tunnel_cfg.gro_receive = vxlan_gro_receive;
+	tunnel_cfg.gro_complete = vxlan_gro_complete;
+
+	setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
+
+	return vs;
+}
+
+static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
+{
+	struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
+	struct vxlan_sock *vs = NULL;
+	struct vxlan_dev_node *node;
+	int l3mdev_index = 0;
+
+	if (vxlan->cfg.remote_ifindex)
+		l3mdev_index = l3mdev_master_upper_ifindex_by_index(
+			vxlan->net, vxlan->cfg.remote_ifindex);
+
+	if (!vxlan->cfg.no_share) {
+		spin_lock(&vn->sock_lock);
+		vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
+				     vxlan->cfg.dst_port, vxlan->cfg.flags,
+				     l3mdev_index);
+		if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
+			spin_unlock(&vn->sock_lock);
+			return -EBUSY;
+		}
+		spin_unlock(&vn->sock_lock);
+	}
+	if (!vs)
+		vs = vxlan_socket_create(vxlan->net, ipv6,
+					 vxlan->cfg.dst_port, vxlan->cfg.flags,
+					 l3mdev_index);
+	if (IS_ERR(vs))
+		return PTR_ERR(vs);
+#if IS_ENABLED(CONFIG_IPV6)
+	if (ipv6) {
+		rcu_assign_pointer(vxlan->vn6_sock, vs);
+		node = &vxlan->hlist6;
+	} else
+#endif
+	{
+		rcu_assign_pointer(vxlan->vn4_sock, vs);
+		node = &vxlan->hlist4;
+	}
+	vxlan_vs_add_dev(vs, vxlan, node);
+	return 0;
+}
+
+static int vxlan_sock_add(struct vxlan_dev *vxlan)
+{
+	bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
+	bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
+	bool ipv4 = !ipv6 || metadata;
+	int ret = 0;
+
+	RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
+#if IS_ENABLED(CONFIG_IPV6)
+	RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
+	if (ipv6) {
+		ret = __vxlan_sock_add(vxlan, true);
+		if (ret < 0 && ret != -EAFNOSUPPORT)
+			ipv4 = false;
+	}
+#endif
+	if (ipv4)
+		ret = __vxlan_sock_add(vxlan, false);
+	if (ret < 0)
+		vxlan_sock_release(vxlan);
+	return ret;
+}
+
+static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
+				 struct net_device **lower,
+				 struct vxlan_dev *old,
+				 struct netlink_ext_ack *extack)
+{
+	struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
+	struct vxlan_dev *tmp;
+	bool use_ipv6 = false;
+
+	if (conf->flags & VXLAN_F_GPE) {
+		/* For now, allow GPE only together with
+		 * COLLECT_METADATA. This can be relaxed later; in such
+		 * case, the other side of the PtP link will have to be
+		 * provided.
+		 */
+		if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
+		    !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
+			NL_SET_ERR_MSG(extack,
+				       "VXLAN GPE does not support this combination of attributes");
+			return -EINVAL;
+		}
+	}
+
+	if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
+		/* Unless IPv6 is explicitly requested, assume IPv4 */
+		conf->remote_ip.sa.sa_family = AF_INET;
+		conf->saddr.sa.sa_family = AF_INET;
+	} else if (!conf->remote_ip.sa.sa_family) {
+		conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
+	} else if (!conf->saddr.sa.sa_family) {
+		conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
+	}
+
+	if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
+		NL_SET_ERR_MSG(extack,
+			       "Local and remote address must be from the same family");
+		return -EINVAL;
+	}
+
+	if (vxlan_addr_multicast(&conf->saddr)) {
+		NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
+		return -EINVAL;
+	}
+
+	if (conf->saddr.sa.sa_family == AF_INET6) {
+		if (!IS_ENABLED(CONFIG_IPV6)) {
+			NL_SET_ERR_MSG(extack,
+				       "IPv6 support not enabled in the kernel");
+			return -EPFNOSUPPORT;
+		}
+		use_ipv6 = true;
+		conf->flags |= VXLAN_F_IPV6;
+
+		if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
+			int local_type =
+				ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
+			int remote_type =
+				ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
+
+			if (local_type & IPV6_ADDR_LINKLOCAL) {
+				if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
+				    (remote_type != IPV6_ADDR_ANY)) {
+					NL_SET_ERR_MSG(extack,
+						       "Invalid combination of local and remote address scopes");
+					return -EINVAL;
+				}
+
+				conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
+			} else {
+				if (remote_type ==
+				    (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
+					NL_SET_ERR_MSG(extack,
+						       "Invalid combination of local and remote address scopes");
+					return -EINVAL;
+				}
+
+				conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
+			}
+		}
+	}
+
+	if (conf->label && !use_ipv6) {
+		NL_SET_ERR_MSG(extack,
+			       "Label attribute only applies to IPv6 VXLAN devices");
+		return -EINVAL;
+	}
+
+	if (conf->remote_ifindex) {
+		struct net_device *lowerdev;
+
+		lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
+		if (!lowerdev) {
+			NL_SET_ERR_MSG(extack,
+				       "Invalid local interface, device not found");
+			return -ENODEV;
+		}
+
+#if IS_ENABLED(CONFIG_IPV6)
+		if (use_ipv6) {
+			struct inet6_dev *idev = __in6_dev_get(lowerdev);
+
+			if (idev && idev->cnf.disable_ipv6) {
+				NL_SET_ERR_MSG(extack,
+					       "IPv6 support disabled by administrator");
+				return -EPERM;
+			}
+		}
+#endif
+
+		*lower = lowerdev;
+	} else {
+		if (vxlan_addr_multicast(&conf->remote_ip)) {
+			NL_SET_ERR_MSG(extack,
+				       "Local interface required for multicast remote destination");
+
+			return -EINVAL;
+		}
+
+#if IS_ENABLED(CONFIG_IPV6)
+		if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
+			NL_SET_ERR_MSG(extack,
+				       "Local interface required for link-local local/remote addresses");
+			return -EINVAL;
+		}
+#endif
+
+		*lower = NULL;
+	}
+
+	if (!conf->dst_port) {
+		if (conf->flags & VXLAN_F_GPE)
+			conf->dst_port = htons(IANA_VXLAN_GPE_UDP_PORT);
+		else
+			conf->dst_port = htons(vxlan_port);
+	}
+
+	if (!conf->age_interval)
+		conf->age_interval = FDB_AGE_DEFAULT;
+
+	list_for_each_entry(tmp, &vn->vxlan_list, next) {
+		if (tmp == old)
+			continue;
+
+		if (tmp->cfg.vni != conf->vni)
+			continue;
+		if (tmp->cfg.dst_port != conf->dst_port)
+			continue;
+		if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
+		    (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
+			continue;
+
+		if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
+		    tmp->cfg.remote_ifindex != conf->remote_ifindex)
+			continue;
+
+		NL_SET_ERR_MSG(extack,
+			       "A VXLAN device with the specified VNI already exists");
+		return -EEXIST;
+	}
+
+	return 0;
+}
+
+static void vxlan_config_apply(struct net_device *dev,
+			       struct vxlan_config *conf,
+			       struct net_device *lowerdev,
+			       struct net *src_net,
+			       bool changelink)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	struct vxlan_rdst *dst = &vxlan->default_dst;
+	unsigned short needed_headroom = ETH_HLEN;
+	bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
+	int max_mtu = ETH_MAX_MTU;
+
+	if (!changelink) {
+		if (conf->flags & VXLAN_F_GPE)
+			vxlan_raw_setup(dev);
+		else
+			vxlan_ether_setup(dev);
+
+		if (conf->mtu)
+			dev->mtu = conf->mtu;
+
+		vxlan->net = src_net;
+	}
+
+	dst->remote_vni = conf->vni;
+
+	memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
+
+	if (lowerdev) {
+		dst->remote_ifindex = conf->remote_ifindex;
+
+		netif_set_gso_max_size(dev, lowerdev->gso_max_size);
+		netif_set_gso_max_segs(dev, lowerdev->gso_max_segs);
+
+		needed_headroom = lowerdev->hard_header_len;
+		needed_headroom += lowerdev->needed_headroom;
+
+		dev->needed_tailroom = lowerdev->needed_tailroom;
+
+		max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
+					   VXLAN_HEADROOM);
+		if (max_mtu < ETH_MIN_MTU)
+			max_mtu = ETH_MIN_MTU;
+
+		if (!changelink && !conf->mtu)
+			dev->mtu = max_mtu;
+	}
+
+	if (dev->mtu > max_mtu)
+		dev->mtu = max_mtu;
+
+	if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
+		needed_headroom += VXLAN6_HEADROOM;
+	else
+		needed_headroom += VXLAN_HEADROOM;
+	dev->needed_headroom = needed_headroom;
+
+	memcpy(&vxlan->cfg, conf, sizeof(*conf));
+}
+
+static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
+			       struct vxlan_config *conf, bool changelink,
+			       struct netlink_ext_ack *extack)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	struct net_device *lowerdev;
+	int ret;
+
+	ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
+	if (ret)
+		return ret;
+
+	vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
+
+	return 0;
+}
+
+static int __vxlan_dev_create(struct net *net, struct net_device *dev,
+			      struct vxlan_config *conf,
+			      struct netlink_ext_ack *extack)
+{
+	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	struct net_device *remote_dev = NULL;
+	struct vxlan_fdb *f = NULL;
+	bool unregister = false;
+	struct vxlan_rdst *dst;
+	int err;
+
+	dst = &vxlan->default_dst;
+	err = vxlan_dev_configure(net, dev, conf, false, extack);
+	if (err)
+		return err;
+
+	dev->ethtool_ops = &vxlan_ethtool_ops;
+
+	/* create an fdb entry for a valid default destination */
+	if (!vxlan_addr_any(&dst->remote_ip)) {
+		err = vxlan_fdb_create(vxlan, all_zeros_mac,
+				       &dst->remote_ip,
+				       NUD_REACHABLE | NUD_PERMANENT,
+				       vxlan->cfg.dst_port,
+				       dst->remote_vni,
+				       dst->remote_vni,
+				       dst->remote_ifindex,
+				       NTF_SELF, 0, &f, extack);
+		if (err)
+			return err;
+	}
+
+	err = register_netdevice(dev);
+	if (err)
+		goto errout;
+	unregister = true;
+
+	if (dst->remote_ifindex) {
+		remote_dev = __dev_get_by_index(net, dst->remote_ifindex);
+		if (!remote_dev) {
+			err = -ENODEV;
+			goto errout;
+		}
+
+		err = netdev_upper_dev_link(remote_dev, dev, extack);
+		if (err)
+			goto errout;
+	}
+
+	err = rtnl_configure_link(dev, NULL);
+	if (err < 0)
+		goto unlink;
+
+	if (f) {
+		vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f);
+
+		/* notify default fdb entry */
+		err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f),
+				       RTM_NEWNEIGH, true, extack);
+		if (err) {
+			vxlan_fdb_destroy(vxlan, f, false, false);
+			if (remote_dev)
+				netdev_upper_dev_unlink(remote_dev, dev);
+			goto unregister;
+		}
+	}
+
+	list_add(&vxlan->next, &vn->vxlan_list);
+	if (remote_dev)
+		dst->remote_dev = remote_dev;
+	return 0;
+unlink:
+	if (remote_dev)
+		netdev_upper_dev_unlink(remote_dev, dev);
+errout:
+	/* unregister_netdevice() destroys the default FDB entry with deletion
+	 * notification. But the addition notification was not sent yet, so
+	 * destroy the entry by hand here.
+	 */
+	if (f)
+		__vxlan_fdb_free(f);
+unregister:
+	if (unregister)
+		unregister_netdevice(dev);
+	return err;
+}
+
+/* Set/clear flags based on attribute */
+static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[],
+			  int attrtype, unsigned long mask, bool changelink,
+			  bool changelink_supported,
+			  struct netlink_ext_ack *extack)
+{
+	unsigned long flags;
+
+	if (!tb[attrtype])
+		return 0;
+
+	if (changelink && !changelink_supported) {
+		vxlan_flag_attr_error(attrtype, extack);
+		return -EOPNOTSUPP;
+	}
+
+	if (vxlan_policy[attrtype].type == NLA_FLAG)
+		flags = conf->flags | mask;
+	else if (nla_get_u8(tb[attrtype]))
+		flags = conf->flags | mask;
+	else
+		flags = conf->flags & ~mask;
+
+	conf->flags = flags;
+
+	return 0;
+}
+
+static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
+			 struct net_device *dev, struct vxlan_config *conf,
+			 bool changelink, struct netlink_ext_ack *extack)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	int err = 0;
+
+	memset(conf, 0, sizeof(*conf));
+
+	/* if changelink operation, start with old existing cfg */
+	if (changelink)
+		memcpy(conf, &vxlan->cfg, sizeof(*conf));
+
+	if (data[IFLA_VXLAN_ID]) {
+		__be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
+
+		if (changelink && (vni != conf->vni)) {
+			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI");
+			return -EOPNOTSUPP;
+		}
+		conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
+	}
+
+	if (data[IFLA_VXLAN_GROUP]) {
+		if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) {
+			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group");
+			return -EOPNOTSUPP;
+		}
+
+		conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
+		conf->remote_ip.sa.sa_family = AF_INET;
+	} else if (data[IFLA_VXLAN_GROUP6]) {
+		if (!IS_ENABLED(CONFIG_IPV6)) {
+			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel");
+			return -EPFNOSUPPORT;
+		}
+
+		if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) {
+			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group");
+			return -EOPNOTSUPP;
+		}
+
+		conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
+		conf->remote_ip.sa.sa_family = AF_INET6;
+	}
+
+	if (data[IFLA_VXLAN_LOCAL]) {
+		if (changelink && (conf->saddr.sa.sa_family != AF_INET)) {
+			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old");
+			return -EOPNOTSUPP;
+		}
+
+		conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
+		conf->saddr.sa.sa_family = AF_INET;
+	} else if (data[IFLA_VXLAN_LOCAL6]) {
+		if (!IS_ENABLED(CONFIG_IPV6)) {
+			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel");
+			return -EPFNOSUPPORT;
+		}
+
+		if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) {
+			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old");
+			return -EOPNOTSUPP;
+		}
+
+		/* TODO: respect scope id */
+		conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
+		conf->saddr.sa.sa_family = AF_INET6;
+	}
+
+	if (data[IFLA_VXLAN_LINK])
+		conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
+
+	if (data[IFLA_VXLAN_TOS])
+		conf->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
+
+	if (data[IFLA_VXLAN_TTL])
+		conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
+
+	if (data[IFLA_VXLAN_TTL_INHERIT]) {
+		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT,
+				    VXLAN_F_TTL_INHERIT, changelink, false,
+				    extack);
+		if (err)
+			return err;
+
+	}
+
+	if (data[IFLA_VXLAN_LABEL])
+		conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
+			     IPV6_FLOWLABEL_MASK;
+
+	if (data[IFLA_VXLAN_LEARNING]) {
+		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING,
+				    VXLAN_F_LEARN, changelink, true,
+				    extack);
+		if (err)
+			return err;
+	} else if (!changelink) {
+		/* default to learn on a new device */
+		conf->flags |= VXLAN_F_LEARN;
+	}
+
+	if (data[IFLA_VXLAN_AGEING])
+		conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
+
+	if (data[IFLA_VXLAN_PROXY]) {
+		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY,
+				    VXLAN_F_PROXY, changelink, false,
+				    extack);
+		if (err)
+			return err;
+	}
+
+	if (data[IFLA_VXLAN_RSC]) {
+		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC,
+				    VXLAN_F_RSC, changelink, false,
+				    extack);
+		if (err)
+			return err;
+	}
+
+	if (data[IFLA_VXLAN_L2MISS]) {
+		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS,
+				    VXLAN_F_L2MISS, changelink, false,
+				    extack);
+		if (err)
+			return err;
+	}
+
+	if (data[IFLA_VXLAN_L3MISS]) {
+		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS,
+				    VXLAN_F_L3MISS, changelink, false,
+				    extack);
+		if (err)
+			return err;
+	}
+
+	if (data[IFLA_VXLAN_LIMIT]) {
+		if (changelink) {
+			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT],
+					    "Cannot change limit");
+			return -EOPNOTSUPP;
+		}
+		conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
+	}
+
+	if (data[IFLA_VXLAN_COLLECT_METADATA]) {
+		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA,
+				    VXLAN_F_COLLECT_METADATA, changelink, false,
+				    extack);
+		if (err)
+			return err;
+	}
+
+	if (data[IFLA_VXLAN_PORT_RANGE]) {
+		if (!changelink) {
+			const struct ifla_vxlan_port_range *p
+				= nla_data(data[IFLA_VXLAN_PORT_RANGE]);
+			conf->port_min = ntohs(p->low);
+			conf->port_max = ntohs(p->high);
+		} else {
+			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
+					    "Cannot change port range");
+			return -EOPNOTSUPP;
+		}
+	}
+
+	if (data[IFLA_VXLAN_PORT]) {
+		if (changelink) {
+			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT],
+					    "Cannot change port");
+			return -EOPNOTSUPP;
+		}
+		conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
+	}
+
+	if (data[IFLA_VXLAN_UDP_CSUM]) {
+		if (changelink) {
+			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM],
+					    "Cannot change UDP_CSUM flag");
+			return -EOPNOTSUPP;
+		}
+		if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
+			conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
+	}
+
+	if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
+		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
+				    VXLAN_F_UDP_ZERO_CSUM6_TX, changelink,
+				    false, extack);
+		if (err)
+			return err;
+	}
+
+	if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
+		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
+				    VXLAN_F_UDP_ZERO_CSUM6_RX, changelink,
+				    false, extack);
+		if (err)
+			return err;
+	}
+
+	if (data[IFLA_VXLAN_REMCSUM_TX]) {
+		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX,
+				    VXLAN_F_REMCSUM_TX, changelink, false,
+				    extack);
+		if (err)
+			return err;
+	}
+
+	if (data[IFLA_VXLAN_REMCSUM_RX]) {
+		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX,
+				    VXLAN_F_REMCSUM_RX, changelink, false,
+				    extack);
+		if (err)
+			return err;
+	}
+
+	if (data[IFLA_VXLAN_GBP]) {
+		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP,
+				    VXLAN_F_GBP, changelink, false, extack);
+		if (err)
+			return err;
+	}
+
+	if (data[IFLA_VXLAN_GPE]) {
+		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE,
+				    VXLAN_F_GPE, changelink, false,
+				    extack);
+		if (err)
+			return err;
+	}
+
+	if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
+		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL,
+				    VXLAN_F_REMCSUM_NOPARTIAL, changelink,
+				    false, extack);
+		if (err)
+			return err;
+	}
+
+	if (tb[IFLA_MTU]) {
+		if (changelink) {
+			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
+					    "Cannot change mtu");
+			return -EOPNOTSUPP;
+		}
+		conf->mtu = nla_get_u32(tb[IFLA_MTU]);
+	}
+
+	if (data[IFLA_VXLAN_DF])
+		conf->df = nla_get_u8(data[IFLA_VXLAN_DF]);
+
+	return 0;
+}
+
+static int vxlan_newlink(struct net *src_net, struct net_device *dev,
+			 struct nlattr *tb[], struct nlattr *data[],
+			 struct netlink_ext_ack *extack)
+{
+	struct vxlan_config conf;
+	int err;
+
+	err = vxlan_nl2conf(tb, data, dev, &conf, false, extack);
+	if (err)
+		return err;
+
+	return __vxlan_dev_create(src_net, dev, &conf, extack);
+}
+
+static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
+			    struct nlattr *data[],
+			    struct netlink_ext_ack *extack)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	struct net_device *lowerdev;
+	struct vxlan_config conf;
+	struct vxlan_rdst *dst;
+	int err;
+
+	dst = &vxlan->default_dst;
+	err = vxlan_nl2conf(tb, data, dev, &conf, true, extack);
+	if (err)
+		return err;
+
+	err = vxlan_config_validate(vxlan->net, &conf, &lowerdev,
+				    vxlan, extack);
+	if (err)
+		return err;
+
+	if (dst->remote_dev == lowerdev)
+		lowerdev = NULL;
+
+	err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev,
+					     extack);
+	if (err)
+		return err;
+
+	/* handle default dst entry */
+	if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) {
+		u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni);
+
+		spin_lock_bh(&vxlan->hash_lock[hash_index]);
+		if (!vxlan_addr_any(&conf.remote_ip)) {
+			err = vxlan_fdb_update(vxlan, all_zeros_mac,
+					       &conf.remote_ip,
+					       NUD_REACHABLE | NUD_PERMANENT,
+					       NLM_F_APPEND | NLM_F_CREATE,
+					       vxlan->cfg.dst_port,
+					       conf.vni, conf.vni,
+					       conf.remote_ifindex,
+					       NTF_SELF, 0, true, extack);
+			if (err) {
+				spin_unlock_bh(&vxlan->hash_lock[hash_index]);
+				netdev_adjacent_change_abort(dst->remote_dev,
+							     lowerdev, dev);
+				return err;
+			}
+		}
+		if (!vxlan_addr_any(&dst->remote_ip))
+			__vxlan_fdb_delete(vxlan, all_zeros_mac,
+					   dst->remote_ip,
+					   vxlan->cfg.dst_port,
+					   dst->remote_vni,
+					   dst->remote_vni,
+					   dst->remote_ifindex,
+					   true);
+		spin_unlock_bh(&vxlan->hash_lock[hash_index]);
+	}
+
+	if (conf.age_interval != vxlan->cfg.age_interval)
+		mod_timer(&vxlan->age_timer, jiffies);
+
+	netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev);
+	if (lowerdev && lowerdev != dst->remote_dev)
+		dst->remote_dev = lowerdev;
+	vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
+	return 0;
+}
+
+static void vxlan_dellink(struct net_device *dev, struct list_head *head)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+
+	vxlan_flush(vxlan, true);
+
+	list_del(&vxlan->next);
+	unregister_netdevice_queue(dev, head);
+	if (vxlan->default_dst.remote_dev)
+		netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev);
+}
+
+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_TTL_INHERIT */
+		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_TOS */
+		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_DF */
+		nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
+		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);
+	const struct vxlan_rdst *dst = &vxlan->default_dst;
+	struct ifla_vxlan_port_range ports = {
+		.low =  htons(vxlan->cfg.port_min),
+		.high = htons(vxlan->cfg.port_max),
+	};
+
+	if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
+		goto nla_put_failure;
+
+	if (!vxlan_addr_any(&dst->remote_ip)) {
+		if (dst->remote_ip.sa.sa_family == AF_INET) {
+			if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
+					    dst->remote_ip.sin.sin_addr.s_addr))
+				goto nla_put_failure;
+#if IS_ENABLED(CONFIG_IPV6)
+		} else {
+			if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
+					     &dst->remote_ip.sin6.sin6_addr))
+				goto nla_put_failure;
+#endif
+		}
+	}
+
+	if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
+		goto nla_put_failure;
+
+	if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
+		if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
+			if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
+					    vxlan->cfg.saddr.sin.sin_addr.s_addr))
+				goto nla_put_failure;
+#if IS_ENABLED(CONFIG_IPV6)
+		} else {
+			if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
+					     &vxlan->cfg.saddr.sin6.sin6_addr))
+				goto nla_put_failure;
+#endif
+		}
+	}
+
+	if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
+	    nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
+		       !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
+	    nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
+	    nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) ||
+	    nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
+	    nla_put_u8(skb, IFLA_VXLAN_LEARNING,
+		       !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
+	    nla_put_u8(skb, IFLA_VXLAN_PROXY,
+		       !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
+	    nla_put_u8(skb, IFLA_VXLAN_RSC,
+		       !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
+	    nla_put_u8(skb, IFLA_VXLAN_L2MISS,
+		       !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
+	    nla_put_u8(skb, IFLA_VXLAN_L3MISS,
+		       !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
+	    nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
+		       !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
+	    nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
+	    nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
+	    nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
+	    nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
+		       !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
+	    nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
+		       !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
+	    nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
+		       !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
+	    nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
+		       !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
+	    nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
+		       !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
+		goto nla_put_failure;
+
+	if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
+		goto nla_put_failure;
+
+	if (vxlan->cfg.flags & VXLAN_F_GBP &&
+	    nla_put_flag(skb, IFLA_VXLAN_GBP))
+		goto nla_put_failure;
+
+	if (vxlan->cfg.flags & VXLAN_F_GPE &&
+	    nla_put_flag(skb, IFLA_VXLAN_GPE))
+		goto nla_put_failure;
+
+	if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
+	    nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
+		goto nla_put_failure;
+
+	return 0;
+
+nla_put_failure:
+	return -EMSGSIZE;
+}
+
+static struct net *vxlan_get_link_net(const struct net_device *dev)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+
+	return vxlan->net;
+}
+
+static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
+	.kind		= "vxlan",
+	.maxtype	= IFLA_VXLAN_MAX,
+	.policy		= vxlan_policy,
+	.priv_size	= sizeof(struct vxlan_dev),
+	.setup		= vxlan_setup,
+	.validate	= vxlan_validate,
+	.newlink	= vxlan_newlink,
+	.changelink	= vxlan_changelink,
+	.dellink	= vxlan_dellink,
+	.get_size	= vxlan_get_size,
+	.fill_info	= vxlan_fill_info,
+	.get_link_net	= vxlan_get_link_net,
+};
+
+struct net_device *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, name, name_assign_type,
+			       &vxlan_link_ops, tb, NULL);
+	if (IS_ERR(dev))
+		return dev;
+
+	err = __vxlan_dev_create(net, dev, conf, NULL);
+	if (err < 0) {
+		free_netdev(dev);
+		return ERR_PTR(err);
+	}
+
+	err = rtnl_configure_link(dev, NULL);
+	if (err < 0) {
+		LIST_HEAD(list_kill);
+
+		vxlan_dellink(dev, &list_kill);
+		unregister_netdevice_many(&list_kill);
+		return ERR_PTR(err);
+	}
+
+	return dev;
+}
+EXPORT_SYMBOL_GPL(vxlan_dev_create);
+
+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)
+			vxlan_dellink(vxlan->dev, &list_kill);
+	}
+
+	unregister_netdevice_many(&list_kill);
+}
+
+static int vxlan_netdevice_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);
+	else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
+		vxlan_offload_rx_ports(dev, true);
+	else if (event == NETDEV_UDP_TUNNEL_DROP_INFO)
+		vxlan_offload_rx_ports(dev, false);
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block vxlan_notifier_block __read_mostly = {
+	.notifier_call = vxlan_netdevice_event,
+};
+
+static void
+vxlan_fdb_offloaded_set(struct net_device *dev,
+			struct switchdev_notifier_vxlan_fdb_info *fdb_info)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	struct vxlan_rdst *rdst;
+	struct vxlan_fdb *f;
+	u32 hash_index;
+
+	hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
+
+	spin_lock_bh(&vxlan->hash_lock[hash_index]);
+
+	f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
+	if (!f)
+		goto out;
+
+	rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip,
+				   fdb_info->remote_port,
+				   fdb_info->remote_vni,
+				   fdb_info->remote_ifindex);
+	if (!rdst)
+		goto out;
+
+	rdst->offloaded = fdb_info->offloaded;
+
+out:
+	spin_unlock_bh(&vxlan->hash_lock[hash_index]);
+}
+
+static int
+vxlan_fdb_external_learn_add(struct net_device *dev,
+			     struct switchdev_notifier_vxlan_fdb_info *fdb_info)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	struct netlink_ext_ack *extack;
+	u32 hash_index;
+	int err;
+
+	hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
+	extack = switchdev_notifier_info_to_extack(&fdb_info->info);
+
+	spin_lock_bh(&vxlan->hash_lock[hash_index]);
+	err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip,
+			       NUD_REACHABLE,
+			       NLM_F_CREATE | NLM_F_REPLACE,
+			       fdb_info->remote_port,
+			       fdb_info->vni,
+			       fdb_info->remote_vni,
+			       fdb_info->remote_ifindex,
+			       NTF_USE | NTF_SELF | NTF_EXT_LEARNED,
+			       0, false, extack);
+	spin_unlock_bh(&vxlan->hash_lock[hash_index]);
+
+	return err;
+}
+
+static int
+vxlan_fdb_external_learn_del(struct net_device *dev,
+			     struct switchdev_notifier_vxlan_fdb_info *fdb_info)
+{
+	struct vxlan_dev *vxlan = netdev_priv(dev);
+	struct vxlan_fdb *f;
+	u32 hash_index;
+	int err = 0;
+
+	hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
+	spin_lock_bh(&vxlan->hash_lock[hash_index]);
+
+	f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
+	if (!f)
+		err = -ENOENT;
+	else if (f->flags & NTF_EXT_LEARNED)
+		err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr,
+					 fdb_info->remote_ip,
+					 fdb_info->remote_port,
+					 fdb_info->vni,
+					 fdb_info->remote_vni,
+					 fdb_info->remote_ifindex,
+					 false);
+
+	spin_unlock_bh(&vxlan->hash_lock[hash_index]);
+
+	return err;
+}
+
+static int vxlan_switchdev_event(struct notifier_block *unused,
+				 unsigned long event, void *ptr)
+{
+	struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
+	struct switchdev_notifier_vxlan_fdb_info *fdb_info;
+	int err = 0;
+
+	switch (event) {
+	case SWITCHDEV_VXLAN_FDB_OFFLOADED:
+		vxlan_fdb_offloaded_set(dev, ptr);
+		break;
+	case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE:
+		fdb_info = ptr;
+		err = vxlan_fdb_external_learn_add(dev, fdb_info);
+		if (err) {
+			err = notifier_from_errno(err);
+			break;
+		}
+		fdb_info->offloaded = true;
+		vxlan_fdb_offloaded_set(dev, fdb_info);
+		break;
+	case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE:
+		fdb_info = ptr;
+		err = vxlan_fdb_external_learn_del(dev, fdb_info);
+		if (err) {
+			err = notifier_from_errno(err);
+			break;
+		}
+		fdb_info->offloaded = false;
+		vxlan_fdb_offloaded_set(dev, fdb_info);
+		break;
+	}
+
+	return err;
+}
+
+static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {
+	.notifier_call = vxlan_switchdev_event,
+};
+
+static void vxlan_fdb_nh_flush(struct nexthop *nh)
+{
+	struct vxlan_fdb *fdb;
+	struct vxlan_dev *vxlan;
+	u32 hash_index;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(fdb, &nh->fdb_list, nh_list) {
+		vxlan = rcu_dereference(fdb->vdev);
+		WARN_ON(!vxlan);
+		hash_index = fdb_head_index(vxlan, fdb->eth_addr,
+					    vxlan->default_dst.remote_vni);
+		spin_lock_bh(&vxlan->hash_lock[hash_index]);
+		if (!hlist_unhashed(&fdb->hlist))
+			vxlan_fdb_destroy(vxlan, fdb, false, false);
+		spin_unlock_bh(&vxlan->hash_lock[hash_index]);
+	}
+	rcu_read_unlock();
+}
+
+static int vxlan_nexthop_event(struct notifier_block *nb,
+			       unsigned long event, void *ptr)
+{
+	struct nh_notifier_info *info = ptr;
+	struct nexthop *nh;
+
+	if (event != NEXTHOP_EVENT_DEL)
+		return NOTIFY_DONE;
+
+	nh = nexthop_find_by_id(info->net, info->id);
+	if (!nh)
+		return NOTIFY_DONE;
+
+	vxlan_fdb_nh_flush(nh);
+
+	return NOTIFY_DONE;
+}
+
+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);
+	vn->nexthop_notifier_block.notifier_call = vxlan_nexthop_event;
+
+	for (h = 0; h < PORT_HASH_SIZE; ++h)
+		INIT_HLIST_HEAD(&vn->sock_list[h]);
+
+	return register_nexthop_notifier(net, &vn->nexthop_notifier_block,
+					 NULL);
+}
+
+static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
+{
+	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+	struct vxlan_dev *vxlan, *next;
+	struct net_device *dev, *aux;
+
+	for_each_netdev_safe(net, dev, aux)
+		if (dev->rtnl_link_ops == &vxlan_link_ops)
+			unregister_netdevice_queue(dev, head);
+
+	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, head);
+	}
+
+}
+
+static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
+{
+	struct net *net;
+	LIST_HEAD(list);
+	unsigned int h;
+
+	list_for_each_entry(net, net_list, exit_list) {
+		struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+
+		unregister_nexthop_notifier(net, &vn->nexthop_notifier_block);
+	}
+	rtnl_lock();
+	list_for_each_entry(net, net_list, exit_list)
+		vxlan_destroy_tunnels(net, &list);
+
+	unregister_netdevice_many(&list);
+	rtnl_unlock();
+
+	list_for_each_entry(net, net_list, exit_list) {
+		struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+
+		for (h = 0; h < PORT_HASH_SIZE; ++h)
+			WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
+	}
+}
+
+static struct pernet_operations vxlan_net_ops = {
+	.init = vxlan_init_net,
+	.exit_batch = vxlan_exit_batch_net,
+	.id   = &vxlan_net_id,
+	.size = sizeof(struct vxlan_net),
+};
+
+static int __init vxlan_init_module(void)
+{
+	int rc;
+
+	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 = register_switchdev_notifier(&vxlan_switchdev_notifier_block);
+	if (rc)
+		goto out3;
+
+	rc = rtnl_link_register(&vxlan_link_ops);
+	if (rc)
+		goto out4;
+
+	return 0;
+out4:
+	unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
+out3:
+	unregister_netdevice_notifier(&vxlan_notifier_block);
+out2:
+	unregister_pernet_subsys(&vxlan_net_ops);
+out1:
+	return rc;
+}
+late_initcall(vxlan_init_module);
+
+static void __exit vxlan_cleanup_module(void)
+{
+	rtnl_link_unregister(&vxlan_link_ops);
+	unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
+	unregister_netdevice_notifier(&vxlan_notifier_block);
+	unregister_pernet_subsys(&vxlan_net_ops);
+	/* rcu_barrier() is called by netns */
+}
+module_exit(vxlan_cleanup_module);
+
+MODULE_LICENSE("GPL");
+MODULE_VERSION(VXLAN_VERSION);
+MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
+MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
+MODULE_ALIAS_RTNL_LINK("vxlan");